From d7556ff5e8179e9e7c3fd18e722ea01cde00601a Mon Sep 17 00:00:00 2001 From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com> Date: Wed, 18 Mar 2026 09:16:42 +0200 Subject: [PATCH 01/19] chore(deps): bump the all-dependencies group with 4 updates (#609) Bumps the all-dependencies group with 4 updates: [ruff](https://github.com/astral-sh/ruff), [tox](https://github.com/tox-dev/tox), [tox-uv](https://github.com/tox-dev/tox-uv) and [uv](https://github.com/astral-sh/uv). Updates `ruff` from 0.15.5 to 0.15.6 - [Release notes](https://github.com/astral-sh/ruff/releases) - [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md) - [Commits](https://github.com/astral-sh/ruff/compare/0.15.5...0.15.6) Updates `tox` from 4.49.0 to 4.49.1 - [Release notes](https://github.com/tox-dev/tox/releases) - [Changelog](https://github.com/tox-dev/tox/blob/main/docs/changelog.rst) - [Commits](https://github.com/tox-dev/tox/compare/4.49.0...4.49.1) Updates `tox-uv` from 1.33.1 to 1.33.4 - [Release notes](https://github.com/tox-dev/tox-uv/releases) - [Commits](https://github.com/tox-dev/tox-uv/compare/1.33.1...1.33.4) Updates `uv` from 0.10.9 to 0.10.10 - [Release notes](https://github.com/astral-sh/uv/releases) - [Changelog](https://github.com/astral-sh/uv/blob/main/CHANGELOG.md) - [Commits](https://github.com/astral-sh/uv/compare/0.10.9...0.10.10) --- updated-dependencies: - dependency-name: ruff dependency-version: 0.15.6 dependency-type: direct:production update-type: version-update:semver-patch dependency-group: all-dependencies - dependency-name: tox dependency-version: 4.49.1 dependency-type: direct:production update-type: version-update:semver-patch dependency-group: all-dependencies - dependency-name: tox-uv dependency-version: 1.33.4 dependency-type: direct:production update-type: version-update:semver-patch dependency-group: all-dependencies - dependency-name: uv dependency-version: 0.10.10 dependency-type: direct:production update-type: version-update:semver-patch dependency-group: all-dependencies ... Signed-off-by: dependabot[bot] Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> --- uv.lock | 93 +++++++++++++++++++++++++++++---------------------------- 1 file changed, 47 insertions(+), 46 deletions(-) diff --git a/uv.lock b/uv.lock index 4e57fde2..40293986 100644 --- a/uv.lock +++ b/uv.lock @@ -827,27 +827,27 @@ wheels = [ [[package]] name = "ruff" -version = "0.15.5" +version = "0.15.6" source = { registry = "https://pypi.org/simple" } -sdist = { url = "https://files.pythonhosted.org/packages/77/9b/840e0039e65fcf12758adf684d2289024d6140cde9268cc59887dc55189c/ruff-0.15.5.tar.gz", hash = "sha256:7c3601d3b6d76dce18c5c824fc8d06f4eef33d6df0c21ec7799510cde0f159a2", size = 4574214, upload-time = "2026-03-05T20:06:34.946Z" } +sdist = { url = "https://files.pythonhosted.org/packages/51/df/f8629c19c5318601d3121e230f74cbee7a3732339c52b21daa2b82ef9c7d/ruff-0.15.6.tar.gz", hash = "sha256:8394c7bb153a4e3811a4ecdacd4a8e6a4fa8097028119160dffecdcdf9b56ae4", size 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guidance for reporting issues and falling back to pre-3.0 releases. Co-Authored-By: Claude Opus 4.6 --- CHANGES.md | 10 ++++++++-- README.rst | 34 +++++++++++++++++++++++++--------- doc/installation.rst | 19 +++++++++++++++---- doc/introduction.rst | 13 +++++++++++++ 4 files changed, 61 insertions(+), 15 deletions(-) diff --git a/CHANGES.md b/CHANGES.md index b52afd85..112b3666 100644 --- a/CHANGES.md +++ b/CHANGES.md @@ -5,18 +5,24 @@ CHANGES ----- Major release: python-snap7 is now a pure Python S7 communication library. +This version completely breaks with the previous approach of wrapping the C snap7 +shared library. The entire S7 protocol stack is now implemented in pure Python, +greatly improving portability and making it easier to install and extend. * **Breaking**: The C snap7 library is no longer required or used * Complete rewrite of the S7 protocol stack in pure Python * Native Python implementation of TPKT (RFC 1006) and COTP (ISO 8073) layers * Native S7 protocol PDU encoding/decoding * Pure Python server implementation for testing and simulation -* No platform-specific binary dependencies +* No platform-specific binary dependencies — works on any platform that runs Python * Improved error handling and connection management * Full type annotations with mypy strict mode * CLI interface for running an S7 server emulator (`pip install "python-snap7[cli]"`) -If you experience issues with 3.0, pin to the last pre-3.0 release: +If you experience issues with 3.0, please report them on the +[issue tracker](https://github.com/gijzelaerr/python-snap7/issues) with a clear +description and the version you are using. As a workaround, pin to the last +pre-3.0 release: $ pip install "python-snap7<3" diff --git a/README.rst b/README.rst index adf68d91..4b59fe8a 100644 --- a/README.rst +++ b/README.rst @@ -8,18 +8,34 @@ Python-snap7 is tested with Python 3.10+, on Windows, Linux and OS X. The full documentation is available on `Read The Docs `_. -Version 3.0 - Breaking Changes -=============================== +Version 3.0 - Pure Python Rewrite +================================== -Version 3.0 is a major release that rewrites python-snap7 as a pure Python -implementation. The C snap7 library is no longer required. +Version 3.0 is a ground-up rewrite of python-snap7. The library no longer wraps the +C snap7 shared library — instead, the entire S7 protocol stack (TPKT, COTP, and S7) +is now implemented in pure Python. This is a **breaking change** from all previous +versions. -This release may contain breaking changes. If you experience issues, you can -pin to the last pre-3.0 release:: +**Why this matters:** - $ pip install "python-snap7<3" +* **Portability**: No more platform-specific shared libraries (`.dll`, `.so`, `.dylib`). + python-snap7 now works on any platform that runs Python — including ARM, Alpine Linux, + and other environments where the C library was difficult or impossible to install. +* **Easier installation**: Just ``pip install python-snap7``. No native dependencies, + no compiler toolchains, no manual library setup. +* **Easier to extend**: New features and protocol support can be added directly in Python. -The latest stable pre-3.0 release is version 2.1.0. +**If you experience issues with 3.0:** + +1. Please report them on the `issue tracker `_ + with a clear description of the problem and the version you are using + (``python -c "import snap7; print(snap7.__version__)"``). +2. As a workaround, you can pin to the last pre-3.0 release:: + + $ pip install "python-snap7<3" + + The latest stable pre-3.0 release is version 2.1.0. Documentation for pre-3.0 + versions is available at `Read The Docs `_. Installation @@ -29,4 +45,4 @@ Install using pip:: $ pip install python-snap7 -No native libraries or platform-specific dependencies are required - python-snap7 is a pure Python package that works on all platforms. +No native libraries or platform-specific dependencies are required — python-snap7 is a pure Python package that works on all platforms. diff --git a/doc/installation.rst b/doc/installation.rst index f6a4a9f5..eaaccb43 100644 --- a/doc/installation.rst +++ b/doc/installation.rst @@ -10,12 +10,23 @@ If you want to use the CLI interface for running an emulator, install it with:: $ pip install "python-snap7[cli]" -That's it! No native libraries or platform-specific setup is required. +That's it! No native libraries or platform-specific setup is required. This works +on any platform that supports Python 3.10+, including ARM, Alpine Linux, and other +environments where the old C library was hard to install. Upgrading from 2.x ------------------- -Version 3.0 is a major rewrite. If you experience issues after upgrading, -you can pin to the last pre-3.0 release:: +Version 3.0 is a complete rewrite. Previous versions wrapped the C snap7 shared +library; version 3.0 implements the entire protocol stack in pure Python. While +the public API is largely the same, this is a fundamental change under the hood. - $ pip install "python-snap7<3" +If you experience issues after upgrading: + +1. Please report them on the `issue tracker `_ + with a clear description and your version (``python -c "import snap7; print(snap7.__version__)"``). +2. As a workaround, pin to the last pre-3.0 release:: + + $ pip install "python-snap7<3" + + The latest stable pre-3.0 release is version 2.1.0. diff --git a/doc/introduction.rst b/doc/introduction.rst index 6994592b..30dee22d 100644 --- a/doc/introduction.rst +++ b/doc/introduction.rst @@ -9,4 +9,17 @@ protocol layers. python-snap7 requires Python 3.10+ and runs on Windows, macOS and Linux without any native dependencies. +.. note:: + + **Version 3.0 is a complete rewrite.** Previous versions of python-snap7 + were a wrapper around the C snap7 shared library. Starting with version 3.0, + the entire protocol stack is implemented in pure Python. This eliminates the + need for platform-specific shared libraries and makes the library portable to + any platform that runs Python. + + If you experience issues, please report them on the + `issue tracker `_ with a + clear description and the version you are using. As a workaround, you can + install the last pre-3.0 release with ``pip install "python-snap7<3"``. + The project development is centralized on `github `_. From d779ba3a436c4a9afda1be64638118b4e231ffeb Mon Sep 17 00:00:00 2001 From: Gijs Molenaar Date: Wed, 18 Mar 2026 09:18:38 +0200 Subject: [PATCH 03/19] Add note explaining the historical python-snap7 name The library no longer wraps the C snap7 library as of 3.0, but the name is kept for backwards compatibility. Co-Authored-By: Claude Opus 4.6 --- README.rst | 4 ++++ doc/introduction.rst | 5 +++++ 2 files changed, 9 insertions(+) diff --git a/README.rst b/README.rst index 4b59fe8a..135dc1d3 100644 --- a/README.rst +++ b/README.rst @@ -3,6 +3,10 @@ About Python-snap7 is a pure Python S7 communication library for interfacing with Siemens S7 PLCs. +The name "python-snap7" is historical — the library originally started as a Python wrapper +around the `Snap7 `_ C library. As of version 3.0, the C +library is no longer used, but the name is kept for backwards compatibility. + Python-snap7 is tested with Python 3.10+, on Windows, Linux and OS X. The full documentation is available on `Read The Docs `_. diff --git a/doc/introduction.rst b/doc/introduction.rst index 30dee22d..cf1d864b 100644 --- a/doc/introduction.rst +++ b/doc/introduction.rst @@ -6,6 +6,11 @@ natively with Siemens S7 PLCs. The library implements the complete S7 protocol stack including TPKT (RFC 1006), COTP (ISO 8073), and S7 protocol layers. +The name "python-snap7" is historical: the library originally started as a +Python wrapper around the `Snap7 `_ C library. +As of version 3.0, the C library is no longer used, but the name is kept for +backwards compatibility. + python-snap7 requires Python 3.10+ and runs on Windows, macOS and Linux without any native dependencies. From f880d8c2fb810f8a014edfa013137aa3bdac60db Mon Sep 17 00:00:00 2001 From: Gijs Molenaar Date: Wed, 18 Mar 2026 10:53:53 +0200 Subject: [PATCH 04/19] Add contributors to 3.0.0 release notes Co-Authored-By: Claude Opus 4.6 --- CHANGES.md | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/CHANGES.md b/CHANGES.md index 112b3666..d3baabb3 100644 --- a/CHANGES.md +++ b/CHANGES.md @@ -26,6 +26,22 @@ pre-3.0 release: $ pip install "python-snap7<3" +### Thanks + +Special thanks to the following people for testing, reporting issues, and providing +feedback during the 3.0 development: + +* [@lupaulus](https://github.com/lupaulus) — extensive testing and bug reports +* [@spreeker](https://github.com/spreeker) — testing and feedback +* [@nikteliy](https://github.com/nikteliy) — review and feedback on the rewrite +* [@amorelettronico](https://github.com/amorelettronico) — testing +* [@razour08](https://github.com/razour08) — testing +* [@core-engineering](https://github.com/core-engineering) — bug reports (#553) +* [@AndreasScharf](https://github.com/AndreasScharf) — bug reports (#572) +* [@Robatronic](https://github.com/Robatronic) — bug reports (#574) +* [@hirotasoshu](https://github.com/hirotasoshu) — feedback (#545) +* [@PoitrasJ](https://github.com/PoitrasJ) — bug reports (#479) + 1.2 --- From 4c52bcbb4d74a5aa118244d69e1abb801c3bef33 Mon Sep 17 00:00:00 2001 From: Gijs Molenaar Date: Fri, 20 Mar 2026 12:13:10 +0200 Subject: [PATCH 05/19] Add coverage badge and coverage threshold (#637) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit * Add coverage badge and coverage threshold - Replace artifact upload with codecov/codecov-action@v5 in test workflow - Add codecov badge to README.rst - Add coverage threshold of 80% in pyproject.toml and codecov.yml Closes #619 Co-Authored-By: Claude Opus 4.6 * Lower coverage threshold to 75% to match current coverage Current coverage is 78% — set threshold to 75% to provide a safety net without failing CI. Can be raised as coverage improves. Co-Authored-By: Claude Opus 4.6 * Add project badges to README Add PyPI version, Python versions, license, CI status, and Read the Docs badges alongside the existing Codecov badge for a professional landing page. Co-Authored-By: Claude Opus 4.6 * Don't fail CI when Codecov upload fails Codecov v5 requires a token for protected branches, causing "Token required because branch is protected" errors that block CI. Coverage upload is best-effort, not a gate. Co-Authored-By: Claude Opus 4.6 --------- Co-authored-by: Claude Opus 4.6 --- .github/workflows/test.yml | 8 ++++---- README.rst | 18 ++++++++++++++++++ codecov.yml | 5 +++++ pyproject.toml | 3 +++ 4 files changed, 30 insertions(+), 4 deletions(-) create mode 100644 codecov.yml diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml index d0374832..6b5a0de3 100644 --- a/.github/workflows/test.yml +++ b/.github/workflows/test.yml @@ -33,9 +33,9 @@ jobs: uv pip install ".[test]" - name: Run pytest run: uv run pytest --cov=snap7 --cov-report=xml --cov-report=term - - name: Upload coverage report + - name: Upload coverage to Codecov if: matrix.python-version == '3.13' && matrix.runs-on == 'ubuntu-24.04' - uses: actions/upload-artifact@v7 + uses: codecov/codecov-action@v5 with: - name: coverage-report - path: coverage.xml + files: coverage.xml + fail_ci_if_error: false diff --git a/README.rst b/README.rst index 135dc1d3..f748fb5f 100644 --- a/README.rst +++ b/README.rst @@ -1,3 +1,21 @@ +.. image:: https://img.shields.io/pypi/v/python-snap7.svg + :target: https://pypi.org/project/python-snap7/ + +.. image:: https://img.shields.io/pypi/pyversions/python-snap7.svg + :target: https://pypi.org/project/python-snap7/ + +.. image:: https://img.shields.io/github/license/gijzelaerr/python-snap7.svg + :target: https://github.com/gijzelaerr/python-snap7/blob/master/LICENSE + +.. image:: https://github.com/gijzelaerr/python-snap7/actions/workflows/test.yml/badge.svg + :target: https://github.com/gijzelaerr/python-snap7/actions/workflows/test.yml + +.. image:: https://readthedocs.org/projects/python-snap7/badge/ + :target: https://python-snap7.readthedocs.io/en/latest/ + +.. image:: https://codecov.io/gh/gijzelaerr/python-snap7/branch/master/graph/badge.svg + :target: https://codecov.io/gh/gijzelaerr/python-snap7 + About ===== diff --git a/codecov.yml b/codecov.yml new file mode 100644 index 00000000..d18039b4 --- /dev/null +++ b/codecov.yml @@ -0,0 +1,5 @@ +coverage: + status: + project: + default: + target: 80% diff --git a/pyproject.toml b/pyproject.toml index ef5d6767..3deb7fa9 100644 --- a/pyproject.toml +++ b/pyproject.toml @@ -64,6 +64,9 @@ strict = true # https://github.com/python/mypy/issues/2427#issuecomment-1419206807 disable_error_code = ["method-assign", "attr-defined"] +[tool.coverage.report] +fail_under = 75 + [tool.ruff] output-format = "full" line-length = 130 From 67713e265d124a0809f747fd80743f920b55f738 Mon Sep 17 00:00:00 2001 From: Gijs Molenaar Date: Fri, 20 Mar 2026 12:13:38 +0200 Subject: [PATCH 06/19] Add comprehensive tests for partner.py (57% -> 84% coverage) (#645) Add 55 tests covering PDU building/parsing, lifecycle management, send/recv buffers, parameters, and dual-partner data exchange via socket pairs. Co-authored-by: Claude Opus 4.6 --- tests/test_partner_coverage.py | 625 +++++++++++++++++++++++++++++++++ 1 file changed, 625 insertions(+) create mode 100644 tests/test_partner_coverage.py diff --git a/tests/test_partner_coverage.py b/tests/test_partner_coverage.py new file mode 100644 index 00000000..bc36b043 --- /dev/null +++ b/tests/test_partner_coverage.py @@ -0,0 +1,625 @@ +"""Extended tests for snap7/partner.py to improve coverage. + +Includes unit tests for PDU building/parsing and dual-partner +integration tests for bidirectional data exchange. +""" + +import socket +import struct +import threading +import time + +import pytest + +from snap7.connection import ISOTCPConnection +from snap7.error import S7Error, S7ConnectionError +from snap7.partner import Partner, PartnerStatus +from snap7.type import Parameter + + +def _free_port() -> int: + """Return a free TCP port chosen by the OS.""" + with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s: + s.bind(("127.0.0.1", 0)) + return s.getsockname()[1] + + +# --------------------------------------------------------------------------- +# PDU building / parsing unit tests (no network required) +# --------------------------------------------------------------------------- + + +@pytest.mark.partner +class TestPartnerPDU: + """Unit tests for partner PDU building and parsing.""" + + def test_build_partner_data_pdu_small(self) -> None: + p = Partner() + data = b"\x01\x02\x03" + pdu = p._build_partner_data_pdu(data) + assert pdu[0:1] == b"\x32" + assert pdu[1:2] == b"\x07" + assert struct.unpack(">H", pdu[2:4])[0] == len(data) + assert pdu[6:] == data + + def test_build_partner_data_pdu_empty(self) -> None: + p = Partner() + pdu = p._build_partner_data_pdu(b"") + assert pdu[0:1] == b"\x32" + assert struct.unpack(">H", pdu[2:4])[0] == 0 + + def test_build_partner_data_pdu_large(self) -> None: + p = Partner() + data = bytes(range(256)) * 4 # 1024 bytes + pdu = p._build_partner_data_pdu(data) + assert struct.unpack(">H", pdu[2:4])[0] == 1024 + assert pdu[6:] == data + + def test_parse_partner_data_pdu_roundtrip(self) -> None: + p = Partner() + original = b"Hello, Partner!" + pdu = p._build_partner_data_pdu(original) + parsed = p._parse_partner_data_pdu(pdu) + assert parsed == original + + def test_parse_partner_data_pdu_roundtrip_various_sizes(self) -> None: + p = Partner() + for size in [0, 1, 10, 100, 500, 1024]: + data = (bytes(range(256)) * (size // 256 + 1))[:size] + pdu = p._build_partner_data_pdu(data) + assert p._parse_partner_data_pdu(pdu) == data + + def test_parse_partner_data_pdu_too_short(self) -> None: + p = Partner() + with pytest.raises(S7Error, match="too short"): + p._parse_partner_data_pdu(b"\x32\x07\x00") + + def test_build_partner_ack(self) -> None: + p = Partner() + ack = p._build_partner_ack() + assert len(ack) == 6 + assert ack[0:1] == b"\x32" + assert ack[1:2] == b"\x08" + + def test_parse_partner_ack_valid(self) -> None: + p = Partner() + ack = p._build_partner_ack() + p._parse_partner_ack(ack) + + def test_parse_partner_ack_too_short(self) -> None: + p = Partner() + with pytest.raises(S7Error, match="too short"): + p._parse_partner_ack(b"\x32") + + def test_parse_partner_ack_wrong_type(self) -> None: + p = Partner() + bad_ack = struct.pack(">BBHH", 0x32, 0x07, 0x0000, 0x0000) + with pytest.raises(S7Error, match="Expected partner ACK"): + p._parse_partner_ack(bad_ack) + + def test_ack_roundtrip(self) -> None: + p = Partner() + ack = p._build_partner_ack() + p._parse_partner_ack(ack) + + +# --------------------------------------------------------------------------- +# Status, stats, lifecycle tests +# --------------------------------------------------------------------------- + + +@pytest.mark.partner +class TestPartnerLifecycle: + """Tests for partner lifecycle, status, and context manager.""" + + def test_initial_status_stopped(self) -> None: + p = Partner() + assert p.get_status().value == PartnerStatus.STOPPED + + def test_status_running_passive(self) -> None: + port = _free_port() + p = Partner(active=False) + p.port = port + try: + p.start_to("127.0.0.1", "", 0x0100, 0x0102) + assert p.running is True + assert p.get_status().value == PartnerStatus.RUNNING + finally: + p.stop() + + def test_stop_idempotent(self) -> None: + p = Partner() + p.stop() + p.stop() + + def test_destroy_returns_zero(self) -> None: + p = Partner() + assert p.destroy() == 0 + + def test_context_manager(self) -> None: + port = _free_port() + with Partner(active=False) as p: + p.port = port + p.start_to("127.0.0.1", "", 0x0100, 0x0102) + assert p.running is True + assert p.running is False + + def test_del_cleanup(self) -> None: + port = _free_port() + p = Partner(active=False) + p.port = port + p.start_to("127.0.0.1", "", 0x0100, 0x0102) + assert p.running is True + p.__del__() + assert p.running is False + + def test_create_noop(self) -> None: + p = Partner() + p.create(active=True) + + def test_get_stats_initial(self) -> None: + p = Partner() + sent, recv, s_err, r_err = p.get_stats() + assert sent.value == 0 + assert recv.value == 0 + assert s_err.value == 0 + assert r_err.value == 0 + + def test_get_times_initial(self) -> None: + p = Partner() + send_t, recv_t = p.get_times() + assert send_t.value == 0 + assert recv_t.value == 0 + + def test_get_last_error_initial(self) -> None: + p = Partner() + assert p.get_last_error().value == 0 + + +# --------------------------------------------------------------------------- +# Send / recv data buffer tests +# --------------------------------------------------------------------------- + + +@pytest.mark.partner +class TestPartnerSendRecvBuffers: + """Tests for set_send_data / get_recv_data and error paths.""" + + def test_set_send_data_and_retrieve(self) -> None: + p = Partner() + assert p._send_data is None + p.set_send_data(b"test") + assert p._send_data == b"test" + + def test_get_recv_data_initially_none(self) -> None: + p = Partner() + assert p.get_recv_data() is None + + def test_b_send_no_data(self) -> None: + p = Partner() + assert p.b_send() == -1 + + def test_b_send_not_connected(self) -> None: + p = Partner() + p.set_send_data(b"data") + with pytest.raises(S7ConnectionError, match="Not connected"): + p.b_send() + + def test_b_recv_not_connected(self) -> None: + p = Partner() + result = p.b_recv() + assert result == -1 + assert p.get_recv_data() is None + + def test_as_b_send_no_data(self) -> None: + p = Partner() + assert p.as_b_send() == -1 + + def test_as_b_send_not_connected(self) -> None: + p = Partner() + p.set_send_data(b"data") + result = p.as_b_send() + assert result == -1 + + def test_check_as_b_recv_completion_empty(self) -> None: + p = Partner() + assert p.check_as_b_recv_completion() == 1 + + def test_check_as_b_recv_completion_with_data(self) -> None: + p = Partner() + p._async_recv_queue.put(b"queued data") + assert p.check_as_b_recv_completion() == 0 + assert p._recv_data == b"queued data" + + def test_check_as_b_send_completion_not_in_progress(self) -> None: + p = Partner() + status, result = p.check_as_b_send_completion() + assert status == "job complete" + + def test_check_as_b_send_completion_in_progress(self) -> None: + p = Partner() + p._async_send_in_progress = True + status, result = p.check_as_b_send_completion() + assert status == "job in progress" + + def test_wait_as_b_send_no_operation(self) -> None: + p = Partner() + with pytest.raises(RuntimeError, match="No async send"): + p.wait_as_b_send_completion() + + def test_wait_as_b_send_timeout(self) -> None: + p = Partner() + p._async_send_in_progress = True + result = p.wait_as_b_send_completion(timeout=50) + assert result == -1 + + def test_wait_as_b_send_completes(self) -> None: + p = Partner() + p._async_send_in_progress = True + p._async_send_result = 0 + + def clear_flag() -> None: + time.sleep(0.05) + p._async_send_in_progress = False + + t = threading.Thread(target=clear_flag) + t.start() + result = p.wait_as_b_send_completion(timeout=2000) + t.join() + assert result == 0 + + +# --------------------------------------------------------------------------- +# Parameter tests +# --------------------------------------------------------------------------- + + +@pytest.mark.partner +class TestPartnerParams: + """Tests for get_param / set_param.""" + + def test_get_param_unsupported(self) -> None: + p = Partner() + with pytest.raises(RuntimeError, match="not supported"): + p.get_param(Parameter.MaxClients) + + def test_set_param_remote_port_raises(self) -> None: + p = Partner() + with pytest.raises(RuntimeError, match="Cannot set"): + p.set_param(Parameter.RemotePort, 1234) + + def test_set_param_local_port(self) -> None: + p = Partner() + p.set_param(Parameter.LocalPort, 5555) + assert p.local_port == 5555 + + def test_set_param_returns_zero(self) -> None: + p = Partner() + assert p.set_param(Parameter.PingTimeout, 999) == 0 + + def test_set_recv_callback_returns_zero(self) -> None: + p = Partner() + assert p.set_recv_callback() == 0 + + def test_set_send_callback_returns_zero(self) -> None: + p = Partner() + assert p.set_send_callback() == 0 + + +# --------------------------------------------------------------------------- +# Dual-partner integration tests using raw socket pairing +# --------------------------------------------------------------------------- + + +def _make_socket_pair() -> tuple[socket.socket, socket.socket]: + """Create a connected TCP socket pair via a temporary server socket.""" + srv = socket.socket(socket.AF_INET, socket.SOCK_STREAM) + srv.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) + srv.bind(("127.0.0.1", 0)) + srv.listen(1) + port = srv.getsockname()[1] + + client = socket.socket(socket.AF_INET, socket.SOCK_STREAM) + client.connect(("127.0.0.1", port)) + server_side, _ = srv.accept() + srv.close() + return client, server_side + + +def _wire_partner(partner: Partner, sock: socket.socket) -> None: + """Wire a connected socket into a Partner so it appears connected.""" + conn = ISOTCPConnection(host="127.0.0.1", port=0, local_tsap=0x0100, remote_tsap=0x0102) + conn.socket = sock + conn.connected = True + partner._socket = sock + partner._connection = conn + partner.connected = True + partner.running = True + + +@pytest.mark.partner +class TestDualPartner: + """Integration tests using two Partner instances exchanging data over sockets.""" + + def test_active_to_passive_send(self) -> None: + sock_a, sock_b = _make_socket_pair() + pa, pb = Partner(), Partner() + try: + _wire_partner(pa, sock_a) + _wire_partner(pb, sock_b) + + payload = b"Hello from A" + pa.set_send_data(payload) + + errors: list[Exception] = [] + + def do_send() -> None: + try: + pa.b_send() + except Exception as e: + errors.append(e) + + t = threading.Thread(target=do_send) + t.start() + + assert pb.b_recv() == 0 + t.join(timeout=3.0) + assert pb.get_recv_data() == payload + assert not errors + finally: + pa.stop() + pb.stop() + + def test_passive_to_active_send(self) -> None: + sock_a, sock_b = _make_socket_pair() + pa, pb = Partner(), Partner() + try: + _wire_partner(pa, sock_a) + _wire_partner(pb, sock_b) + + payload = b"Hello from B" + pb.set_send_data(payload) + + errors: list[Exception] = [] + + def do_send() -> None: + try: + pb.b_send() + except Exception as e: + errors.append(e) + + t = threading.Thread(target=do_send) + t.start() + + assert pa.b_recv() == 0 + t.join(timeout=3.0) + assert pa.get_recv_data() == payload + assert not errors + finally: + pa.stop() + pb.stop() + + def test_bidirectional_exchange(self) -> None: + sock_a, sock_b = _make_socket_pair() + pa, pb = Partner(), Partner() + try: + _wire_partner(pa, sock_a) + _wire_partner(pb, sock_b) + + errors: list[Exception] = [] + + # A -> B + pa.set_send_data(b"A->B") + + def send_a() -> None: + try: + pa.b_send() + except Exception as e: + errors.append(e) + + t1 = threading.Thread(target=send_a) + t1.start() + pb.b_recv() + t1.join(timeout=3.0) + assert pb.get_recv_data() == b"A->B" + + # B -> A + pb.set_send_data(b"B->A") + + def send_b() -> None: + try: + pb.b_send() + except Exception as e: + errors.append(e) + + t2 = threading.Thread(target=send_b) + t2.start() + pa.b_recv() + t2.join(timeout=3.0) + assert pa.get_recv_data() == b"B->A" + assert not errors + finally: + pa.stop() + pb.stop() + + def test_various_payload_sizes(self) -> None: + sock_a, sock_b = _make_socket_pair() + pa, pb = Partner(), Partner() + try: + _wire_partner(pa, sock_a) + _wire_partner(pb, sock_b) + + for size in [1, 10, 100, 480]: + payload = (bytes(range(256)) * (size // 256 + 1))[:size] + pa.set_send_data(payload) + errors: list[Exception] = [] + + def do_send() -> None: + try: + pa.b_send() + except Exception as e: + errors.append(e) + + t = threading.Thread(target=do_send) + t.start() + pb.b_recv() + t.join(timeout=3.0) + assert pb.get_recv_data() == payload, f"Failed for size {size}" + assert not errors + finally: + pa.stop() + pb.stop() + + def test_stats_updated_after_exchange(self) -> None: + sock_a, sock_b = _make_socket_pair() + pa, pb = Partner(), Partner() + try: + _wire_partner(pa, sock_a) + _wire_partner(pb, sock_b) + + payload = b"stats test" + pa.set_send_data(payload) + + def do_send() -> None: + pa.b_send() + + t = threading.Thread(target=do_send) + t.start() + pb.b_recv() + t.join(timeout=3.0) + + sent, _, s_err, _ = pa.get_stats() + assert sent.value == len(payload) + assert s_err.value == 0 + + _, recv, _, r_err = pb.get_stats() + assert recv.value == len(payload) + assert r_err.value == 0 + + send_t, _ = pa.get_times() + assert send_t.value >= 0 + _, recv_t = pb.get_times() + assert recv_t.value >= 0 + finally: + pa.stop() + pb.stop() + + def test_status_connected(self) -> None: + sock_a, sock_b = _make_socket_pair() + pa, pb = Partner(), Partner() + try: + _wire_partner(pa, sock_a) + _wire_partner(pb, sock_b) + assert pa.get_status().value == PartnerStatus.CONNECTED + assert pb.get_status().value == PartnerStatus.CONNECTED + finally: + pa.stop() + pb.stop() + + def test_status_after_stop(self) -> None: + sock_a, sock_b = _make_socket_pair() + pa, pb = Partner(), Partner() + try: + _wire_partner(pa, sock_a) + _wire_partner(pb, sock_b) + pa.stop() + assert pa.get_status().value == PartnerStatus.STOPPED + finally: + pa.stop() + pb.stop() + + def test_recv_callback_fires(self) -> None: + sock_a, sock_b = _make_socket_pair() + pa, pb = Partner(), Partner() + try: + _wire_partner(pa, sock_a) + _wire_partner(pb, sock_b) + + received_data: list[bytes] = [] + pb._recv_callback = lambda data: received_data.append(data) + + payload = b"callback test" + pa.set_send_data(payload) + + def do_send() -> None: + pa.b_send() + + t = threading.Thread(target=do_send) + t.start() + pb.b_recv() + t.join(timeout=3.0) + + assert len(received_data) == 1 + assert received_data[0] == payload + finally: + pa.stop() + pb.stop() + + def test_b_recv_error_returns_negative(self) -> None: + """b_recv returns -1 on receive error when no data arrives.""" + sock_a, sock_b = _make_socket_pair() + pa, pb = Partner(), Partner() + try: + _wire_partner(pa, sock_a) + _wire_partner(pb, sock_b) + # Close sender side so receiver gets an error + sock_a.close() + result = pb.b_recv() + assert result == -1 + finally: + pa.stop() + pb.stop() + + +# --------------------------------------------------------------------------- +# Passive partner accept/listen tests +# --------------------------------------------------------------------------- + + +@pytest.mark.partner +class TestPassivePartner: + """Tests for passive partner listening and accept behavior.""" + + def test_accept_connection_server_socket_none(self) -> None: + """_accept_connection returns immediately if server socket is None.""" + p = Partner(active=False) + p._server_socket = None + p._accept_connection() # Should not raise + + +# --------------------------------------------------------------------------- +# Active partner connection error tests +# --------------------------------------------------------------------------- + + +@pytest.mark.partner +class TestPartnerConnectionErrors: + """Tests for connection error paths.""" + + def test_active_no_remote_ip(self) -> None: + p = Partner(active=True) + with pytest.raises(S7ConnectionError, match="Remote IP"): + p.start_to("127.0.0.1", "", 0x0100, 0x0102) + + def test_active_connect_refused(self) -> None: + p = Partner(active=True) + port = _free_port() + p.port = port + with pytest.raises(S7ConnectionError): + p.start_to("127.0.0.1", "127.0.0.1", 0x0100, 0x0102) + + def test_b_send_increments_send_errors(self) -> None: + p = Partner() + p.set_send_data(b"data") + try: + p.b_send() + except S7ConnectionError: + pass + _, _, s_err, _ = p.get_stats() + assert s_err.value == 1 + + def test_b_recv_increments_recv_errors(self) -> None: + p = Partner() + p.b_recv() + _, _, _, r_err = p.get_stats() + assert r_err.value == 1 From 60047da43d63c628b927a73c71f000e6148a8dbd Mon Sep 17 00:00:00 2001 From: Gijs Molenaar Date: Fri, 20 Mar 2026 12:14:23 +0200 Subject: [PATCH 07/19] Accept memoryview in setter and getter type annotations (#647) The setter functions already worked with memoryview at runtime (using direct struct.pack() slice assignment), but the type annotations only accepted bytearray. This caused mypy errors when passing memoryview objects from ctypes buffers. - Add Buffer type alias (Union[bytearray, memoryview]) to setters and getters - Update all function signatures to accept Buffer - Fix .decode() calls in getters to use bytes() for memoryview compat - Add 17 memoryview compatibility tests Credit: LuTiFlekSSer for identifying the memoryview compatibility issue. Co-authored-by: Claude Opus 4.6 --- snap7/util/db.py | 4 +- snap7/util/getters.py | 72 +++++++++++----------- snap7/util/setters.py | 50 +++++++++------- tests/test_util.py | 135 ++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 203 insertions(+), 58 deletions(-) diff --git a/snap7/util/db.py b/snap7/util/db.py index 47f65aa2..b3aaa2d9 100644 --- a/snap7/util/db.py +++ b/snap7/util/db.py @@ -635,7 +635,9 @@ def get_value(self, byte_index: Union[str, int], type_: str) -> ValueType: return type_to_func[type_](bytearray_, byte_index) raise ValueError - def set_value(self, byte_index: Union[str, int], type_: str, value: Union[bool, str, float]) -> Optional[bytearray]: + def set_value( + self, byte_index: Union[str, int], type_: str, value: Union[bool, str, float] + ) -> Optional[Union[bytearray, memoryview]]: """Sets the value for a specific type in the specified byte index. Args: diff --git a/snap7/util/getters.py b/snap7/util/getters.py index 32b85433..01c2f963 100644 --- a/snap7/util/getters.py +++ b/snap7/util/getters.py @@ -1,12 +1,16 @@ import struct from datetime import timedelta, datetime, date -from typing import NoReturn +from typing import NoReturn, Union from logging import getLogger +#: Buffer types accepted by getter functions. +#: Both :class:`bytearray` and :class:`memoryview` are supported. +Buffer = Union[bytearray, memoryview] + logger = getLogger(__name__) -def get_bool(bytearray_: bytearray, byte_index: int, bool_index: int) -> bool: +def get_bool(bytearray_: Buffer, byte_index: int, bool_index: int) -> bool: """Get the boolean value from location in bytearray Args: @@ -28,7 +32,7 @@ def get_bool(bytearray_: bytearray, byte_index: int, bool_index: int) -> bool: return current_value == index_value -def get_byte(bytearray_: bytearray, byte_index: int) -> bytes: +def get_byte(bytearray_: Buffer, byte_index: int) -> bytes: """Get byte value from bytearray. Notes: @@ -48,7 +52,7 @@ def get_byte(bytearray_: bytearray, byte_index: int) -> bytes: return value -def get_word(bytearray_: bytearray, byte_index: int) -> bytearray: +def get_word(bytearray_: Buffer, byte_index: int) -> bytearray: """Get word value from bytearray. Notes: @@ -73,7 +77,7 @@ def get_word(bytearray_: bytearray, byte_index: int) -> bytearray: return value -def get_int(bytearray_: bytearray, byte_index: int) -> int: +def get_int(bytearray_: Buffer, byte_index: int) -> int: """Get int value from bytearray. Notes: @@ -98,7 +102,7 @@ def get_int(bytearray_: bytearray, byte_index: int) -> int: return value -def get_uint(bytearray_: bytearray, byte_index: int) -> int: +def get_uint(bytearray_: Buffer, byte_index: int) -> int: """Get unsigned int value from bytearray. Notes: @@ -121,7 +125,7 @@ def get_uint(bytearray_: bytearray, byte_index: int) -> int: return int(get_word(bytearray_, byte_index)) -def get_real(bytearray_: bytearray, byte_index: int) -> float: +def get_real(bytearray_: Buffer, byte_index: int) -> float: """Get real value. Notes: @@ -145,7 +149,7 @@ def get_real(bytearray_: bytearray, byte_index: int) -> float: return real -def get_fstring(bytearray_: bytearray, byte_index: int, max_length: int, remove_padding: bool = True) -> str: +def get_fstring(bytearray_: Buffer, byte_index: int, max_length: int, remove_padding: bool = True) -> str: """Parse space-padded fixed-length string from bytearray Notes: @@ -176,7 +180,7 @@ def get_fstring(bytearray_: bytearray, byte_index: int, max_length: int, remove_ return string -def get_string(bytearray_: bytearray, byte_index: int) -> str: +def get_string(bytearray_: Buffer, byte_index: int) -> str: """Parse string from bytearray Notes: @@ -210,7 +214,7 @@ def get_string(bytearray_: bytearray, byte_index: int) -> str: return "".join(data) -def get_dword(bytearray_: bytearray, byte_index: int) -> int: +def get_dword(bytearray_: Buffer, byte_index: int) -> int: """Gets the dword from the buffer. Notes: @@ -235,7 +239,7 @@ def get_dword(bytearray_: bytearray, byte_index: int) -> int: return dword -def get_dint(bytearray_: bytearray, byte_index: int) -> int: +def get_dint(bytearray_: Buffer, byte_index: int) -> int: """Get dint value from bytearray. Notes: @@ -262,7 +266,7 @@ def get_dint(bytearray_: bytearray, byte_index: int) -> int: return dint -def get_udint(bytearray_: bytearray, byte_index: int) -> int: +def get_udint(bytearray_: Buffer, byte_index: int) -> int: """Get unsigned dint value from bytearray. Notes: @@ -289,7 +293,7 @@ def get_udint(bytearray_: bytearray, byte_index: int) -> int: return dint -def get_s5time(bytearray_: bytearray, byte_index: int) -> str: +def get_s5time(bytearray_: Buffer, byte_index: int) -> str: micro_to_milli = 1000 data_bytearray = bytearray_[byte_index : byte_index + 2] s5time_data_int_like = list(data_bytearray.hex()) @@ -315,7 +319,7 @@ def get_s5time(bytearray_: bytearray, byte_index: int) -> str: return "".join(str(s5time)) -def get_dt(bytearray_: bytearray, byte_index: int) -> str: +def get_dt(bytearray_: Buffer, byte_index: int) -> str: """Get DATE_AND_TIME Value from bytearray as ISO 8601 formatted Date String Notes: Datatype `DATE_AND_TIME` consists in 8 bytes in the PLC. @@ -331,7 +335,7 @@ def get_dt(bytearray_: bytearray, byte_index: int) -> str: return get_date_time_object(bytearray_, byte_index).isoformat(timespec="microseconds") -def get_date_time_object(bytearray_: bytearray, byte_index: int) -> datetime: +def get_date_time_object(bytearray_: Buffer, byte_index: int) -> datetime: """Get DATE_AND_TIME Value from bytearray as python datetime object Notes: Datatype `DATE_AND_TIME` consists in 8 bytes in the PLC. @@ -364,7 +368,7 @@ def bcd_to_byte(byte: int) -> int: return datetime(year, month, day, hour, min_, sec, microsec) -def get_time(bytearray_: bytearray, byte_index: int) -> str: +def get_time(bytearray_: Buffer, byte_index: int) -> str: """Get time value from bytearray. Notes: @@ -408,7 +412,7 @@ def get_time(bytearray_: bytearray, byte_index: int) -> str: return time_str -def get_usint(bytearray_: bytearray, byte_index: int) -> int: +def get_usint(bytearray_: Buffer, byte_index: int) -> int: """Get the unsigned small int from the bytearray Notes: @@ -434,7 +438,7 @@ def get_usint(bytearray_: bytearray, byte_index: int) -> int: return value -def get_sint(bytearray_: bytearray, byte_index: int) -> int: +def get_sint(bytearray_: Buffer, byte_index: int) -> int: """Get the small int Notes: @@ -460,7 +464,7 @@ def get_sint(bytearray_: bytearray, byte_index: int) -> int: return value -def get_lint(bytearray_: bytearray, byte_index: int) -> int: +def get_lint(bytearray_: Buffer, byte_index: int) -> int: """Get the long int THIS VALUE IS NEITHER TESTED NOR VERIFIED BY A REAL PLC AT THE MOMENT @@ -490,7 +494,7 @@ def get_lint(bytearray_: bytearray, byte_index: int) -> int: return int(lint) -def get_lreal(bytearray_: bytearray, byte_index: int) -> float: +def get_lreal(bytearray_: Buffer, byte_index: int) -> float: """Get the long real Datatype `lreal` (long real) consists in 8 bytes in the PLC. @@ -515,7 +519,7 @@ def get_lreal(bytearray_: bytearray, byte_index: int) -> float: return float(struct.unpack_from(">d", bytearray_, offset=byte_index)[0]) -def get_lword(bytearray_: bytearray, byte_index: int) -> int: +def get_lword(bytearray_: Buffer, byte_index: int) -> int: """Get the long word Notes: @@ -540,7 +544,7 @@ def get_lword(bytearray_: bytearray, byte_index: int) -> int: return lword -def get_ulint(bytearray_: bytearray, byte_index: int) -> int: +def get_ulint(bytearray_: Buffer, byte_index: int) -> int: """Get ulint value from bytearray. Notes: @@ -565,7 +569,7 @@ def get_ulint(bytearray_: bytearray, byte_index: int) -> int: return lint -def get_tod(bytearray_: bytearray, byte_index: int) -> timedelta: +def get_tod(bytearray_: Buffer, byte_index: int) -> timedelta: len_bytearray_ = len(bytearray_) byte_range = byte_index + 4 if len_bytearray_ < byte_range: @@ -576,7 +580,7 @@ def get_tod(bytearray_: bytearray, byte_index: int) -> timedelta: return time_val -def get_date(bytearray_: bytearray, byte_index: int = 0) -> date: +def get_date(bytearray_: Buffer, byte_index: int = 0) -> date: len_bytearray_ = len(bytearray_) byte_range = byte_index + 2 if len_bytearray_ < byte_range: @@ -587,7 +591,7 @@ def get_date(bytearray_: bytearray, byte_index: int = 0) -> date: return date_val -def get_ltime(bytearray_: bytearray, byte_index: int) -> timedelta: +def get_ltime(bytearray_: Buffer, byte_index: int) -> timedelta: """Get LTIME value from bytearray. Notes: @@ -612,7 +616,7 @@ def get_ltime(bytearray_: bytearray, byte_index: int) -> timedelta: return timedelta(microseconds=nanoseconds // 1000) -def get_ltod(bytearray_: bytearray, byte_index: int) -> timedelta: +def get_ltod(bytearray_: Buffer, byte_index: int) -> timedelta: """Get LTOD (Long Time of Day) value from bytearray. Notes: @@ -635,7 +639,7 @@ def get_ltod(bytearray_: bytearray, byte_index: int) -> timedelta: return result -def get_ldt(bytearray_: bytearray, byte_index: int) -> datetime: +def get_ldt(bytearray_: Buffer, byte_index: int) -> datetime: """Get LDT (Long Date and Time) value from bytearray. Notes: @@ -655,7 +659,7 @@ def get_ldt(bytearray_: bytearray, byte_index: int) -> datetime: return epoch + timedelta(microseconds=nanoseconds // 1000) -def get_dtl(bytearray_: bytearray, byte_index: int) -> datetime: +def get_dtl(bytearray_: Buffer, byte_index: int) -> datetime: time_to_datetime = datetime( year=int.from_bytes(bytearray_[byte_index : byte_index + 2], byteorder="big"), month=int(bytearray_[byte_index + 2]), @@ -670,7 +674,7 @@ def get_dtl(bytearray_: bytearray, byte_index: int) -> datetime: return time_to_datetime -def get_char(bytearray_: bytearray, byte_index: int) -> str: +def get_char(bytearray_: Buffer, byte_index: int) -> str: """Get char value from bytearray. Notes: @@ -694,7 +698,7 @@ def get_char(bytearray_: bytearray, byte_index: int) -> str: return char -def get_wchar(bytearray_: bytearray, byte_index: int) -> str: +def get_wchar(bytearray_: Buffer, byte_index: int) -> str: """Get wchar value from bytearray. Datatype `wchar` in the PLC is represented in 2 bytes. It has to be in utf-16-be format. @@ -715,10 +719,10 @@ def get_wchar(bytearray_: bytearray, byte_index: int) -> str: """ if bytearray_[byte_index] == 0: return chr(bytearray_[byte_index + 1]) - return bytearray_[byte_index : byte_index + 2].decode("utf-16-be") + return bytes(bytearray_[byte_index : byte_index + 2]).decode("utf-16-be") -def get_wstring(bytearray_: bytearray, byte_index: int) -> str: +def get_wstring(bytearray_: Buffer, byte_index: int) -> str: """Parse wstring from bytearray Notes: @@ -759,8 +763,8 @@ def get_wstring(bytearray_: bytearray, byte_index: int) -> str: f"expected or is larger than 16382. Bytearray doesn't seem to be a valid string." ) - return bytearray_[wstring_start : wstring_start + wstr_symbols_amount].decode("utf-16-be") + return bytes(bytearray_[wstring_start : wstring_start + wstr_symbols_amount]).decode("utf-16-be") -def get_array(bytearray_: bytearray, byte_index: int) -> NoReturn: +def get_array(bytearray_: Buffer, byte_index: int) -> NoReturn: raise NotImplementedError diff --git a/snap7/util/setters.py b/snap7/util/setters.py index 4cf8ad60..31d6d174 100644 --- a/snap7/util/setters.py +++ b/snap7/util/setters.py @@ -5,8 +5,12 @@ from .getters import get_bool +#: Buffer types accepted by setter functions. +#: Both :class:`bytearray` and writable :class:`memoryview` are supported. +Buffer = Union[bytearray, memoryview] -def set_bool(bytearray_: bytearray, byte_index: int, bool_index: int, value: bool) -> bytearray: + +def set_bool(bytearray_: Buffer, byte_index: int, bool_index: int, value: bool) -> Buffer: """Set boolean value on location in bytearray. Args: @@ -40,7 +44,7 @@ def set_bool(bytearray_: bytearray, byte_index: int, bool_index: int, value: boo return bytearray_ -def set_byte(bytearray_: bytearray, byte_index: int, _int: int) -> bytearray: +def set_byte(bytearray_: Buffer, byte_index: int, _int: int) -> Buffer: """Set value in bytearray to byte Args: @@ -61,7 +65,7 @@ def set_byte(bytearray_: bytearray, byte_index: int, _int: int) -> bytearray: return bytearray_ -def set_word(bytearray_: bytearray, byte_index: int, _int: int) -> bytearray: +def set_word(bytearray_: Buffer, byte_index: int, _int: int) -> Buffer: """Set value in bytearray to word Notes: @@ -80,7 +84,7 @@ def set_word(bytearray_: bytearray, byte_index: int, _int: int) -> bytearray: return bytearray_ -def set_int(bytearray_: bytearray, byte_index: int, _int: int) -> bytearray: +def set_int(bytearray_: Buffer, byte_index: int, _int: int) -> Buffer: """Set value in bytearray to int Notes: @@ -105,7 +109,7 @@ def set_int(bytearray_: bytearray, byte_index: int, _int: int) -> bytearray: return bytearray_ -def set_uint(bytearray_: bytearray, byte_index: int, _int: int) -> bytearray: +def set_uint(bytearray_: Buffer, byte_index: int, _int: int) -> Buffer: """Set value in bytearray to unsigned int Notes: @@ -131,7 +135,7 @@ def set_uint(bytearray_: bytearray, byte_index: int, _int: int) -> bytearray: return bytearray_ -def set_real(bytearray_: bytearray, byte_index: int, real: Union[bool, str, float, int]) -> bytearray: +def set_real(bytearray_: Buffer, byte_index: int, real: Union[bool, str, float, int]) -> Buffer: """Set Real value Notes: @@ -155,7 +159,7 @@ def set_real(bytearray_: bytearray, byte_index: int, real: Union[bool, str, floa return bytearray_ -def set_fstring(bytearray_: bytearray, byte_index: int, value: str, max_length: int) -> bytearray: +def set_fstring(bytearray_: Buffer, byte_index: int, value: str, max_length: int) -> Buffer: """Set space-padded fixed-length string value Args: @@ -193,7 +197,7 @@ def set_fstring(bytearray_: bytearray, byte_index: int, value: str, max_length: return bytearray_ -def set_string(bytearray_: bytearray, byte_index: int, value: str, max_size: int = 254) -> bytearray: +def set_string(bytearray_: Buffer, byte_index: int, value: str, max_size: int = 254) -> Buffer: """Set string value Args: @@ -248,7 +252,7 @@ def set_string(bytearray_: bytearray, byte_index: int, value: str, max_size: int return bytearray_ -def set_dword(bytearray_: bytearray, byte_index: int, dword: int) -> bytearray: +def set_dword(bytearray_: Buffer, byte_index: int, dword: int) -> Buffer: """Set a DWORD to the buffer. Notes: @@ -271,7 +275,7 @@ def set_dword(bytearray_: bytearray, byte_index: int, dword: int) -> bytearray: return bytearray_ -def set_dint(bytearray_: bytearray, byte_index: int, dint: int) -> bytearray: +def set_dint(bytearray_: Buffer, byte_index: int, dint: int) -> Buffer: """Set value in bytearray to dint Notes: @@ -295,7 +299,7 @@ def set_dint(bytearray_: bytearray, byte_index: int, dint: int) -> bytearray: return bytearray_ -def set_udint(bytearray_: bytearray, byte_index: int, udint: int) -> bytearray: +def set_udint(bytearray_: Buffer, byte_index: int, udint: int) -> Buffer: """Set value in bytearray to unsigned dint Notes: @@ -319,7 +323,7 @@ def set_udint(bytearray_: bytearray, byte_index: int, udint: int) -> bytearray: return bytearray_ -def set_time(bytearray_: bytearray, byte_index: int, time_string: str) -> bytearray: +def set_time(bytearray_: Buffer, byte_index: int, time_string: str) -> Buffer: """Set value in bytearray to time Notes: @@ -366,7 +370,7 @@ def set_time(bytearray_: bytearray, byte_index: int, time_string: str) -> bytear raise ValueError("time value out of range, please check the value interval") -def set_usint(bytearray_: bytearray, byte_index: int, _int: int) -> bytearray: +def set_usint(bytearray_: Buffer, byte_index: int, _int: int) -> Buffer: """Set unsigned small int Notes: @@ -392,7 +396,7 @@ def set_usint(bytearray_: bytearray, byte_index: int, _int: int) -> bytearray: return bytearray_ -def set_sint(bytearray_: bytearray, byte_index: int, _int: int) -> bytearray: +def set_sint(bytearray_: Buffer, byte_index: int, _int: int) -> Buffer: """Set small int to the buffer. Notes: @@ -418,7 +422,7 @@ def set_sint(bytearray_: bytearray, byte_index: int, _int: int) -> bytearray: return bytearray_ -def set_lreal(bytearray_: bytearray, byte_index: int, lreal: float) -> bytearray: +def set_lreal(bytearray_: Buffer, byte_index: int, lreal: float) -> Buffer: """Set the long real Notes: @@ -447,7 +451,7 @@ def set_lreal(bytearray_: bytearray, byte_index: int, lreal: float) -> bytearray return bytearray_ -def set_lword(bytearray_: bytearray, byte_index: int, lword: int) -> bytearray: +def set_lword(bytearray_: Buffer, byte_index: int, lword: int) -> Buffer: """Set the long word Notes: @@ -474,7 +478,7 @@ def set_lword(bytearray_: bytearray, byte_index: int, lword: int) -> bytearray: return bytearray_ -def set_char(bytearray_: bytearray, byte_index: int, chr_: str) -> bytearray: +def set_char(bytearray_: Buffer, byte_index: int, chr_: str) -> Buffer: """Set char value in a bytearray. Notes: @@ -510,7 +514,7 @@ def set_char(bytearray_: bytearray, byte_index: int, chr_: str) -> bytearray: raise ValueError(f"chr_ : {chr_} contains ascii value > 255, which is not compatible with PLC Type CHAR.") -def set_date(bytearray_: bytearray, byte_index: int, date_: date) -> bytearray: +def set_date(bytearray_: Buffer, byte_index: int, date_: date) -> Buffer: """Set value in bytearray to date Notes: Datatype `date` consists in the number of days elapsed from 1990-01-01. @@ -534,7 +538,7 @@ def set_date(bytearray_: bytearray, byte_index: int, date_: date) -> bytearray: return bytearray_ -def set_wchar(bytearray_: bytearray, byte_index: int, chr_: str) -> bytearray: +def set_wchar(bytearray_: Buffer, byte_index: int, chr_: str) -> Buffer: """Set wchar value in a bytearray. Notes: @@ -563,7 +567,7 @@ def set_wchar(bytearray_: bytearray, byte_index: int, chr_: str) -> bytearray: return bytearray_ -def set_wstring(bytearray_: bytearray, byte_index: int, value: str, max_size: int = 16382) -> None: +def set_wstring(bytearray_: Buffer, byte_index: int, value: str, max_size: int = 16382) -> None: """Set wstring value Notes: @@ -606,7 +610,7 @@ def set_wstring(bytearray_: bytearray, byte_index: int, value: str, max_size: in bytearray_[byte_index + 4 : byte_index + 4 + len(encoded)] = encoded -def set_tod(bytearray_: bytearray, byte_index: int, tod: timedelta) -> bytearray: +def set_tod(bytearray_: Buffer, byte_index: int, tod: timedelta) -> Buffer: """Set TIME_OF_DAY value in bytearray. Notes: @@ -633,7 +637,7 @@ def set_tod(bytearray_: bytearray, byte_index: int, tod: timedelta) -> bytearray return bytearray_ -def set_dtl(bytearray_: bytearray, byte_index: int, dt_: datetime) -> bytearray: +def set_dtl(bytearray_: Buffer, byte_index: int, dt_: datetime) -> Buffer: """Set DTL (Date and Time Long) value in bytearray. Notes: @@ -678,7 +682,7 @@ def set_dtl(bytearray_: bytearray, byte_index: int, dt_: datetime) -> bytearray: return bytearray_ -def set_dt(bytearray_: bytearray, byte_index: int, dt_: datetime) -> bytearray: +def set_dt(bytearray_: Buffer, byte_index: int, dt_: datetime) -> Buffer: """Set DATE_AND_TIME value in bytearray. Notes: diff --git a/tests/test_util.py b/tests/test_util.py index 2f76d2d0..b541cfc2 100644 --- a/tests/test_util.py +++ b/tests/test_util.py @@ -801,5 +801,140 @@ def test_set_dtl_in_row(self) -> None: self.assertEqual(result.second, 30) +class TestMemoryviewCompat(unittest.TestCase): + """Test that setter and getter functions work with memoryview buffers.""" + + def test_set_bool_memoryview(self) -> None: + from snap7.util.setters import set_bool + + buf = bytearray(1) + mv = memoryview(buf) + set_bool(mv, 0, 0, True) + self.assertEqual(buf[0], 1) + + def test_set_byte_memoryview(self) -> None: + buf = bytearray(1) + mv = memoryview(buf) + set_byte(mv, 0, 42) + self.assertEqual(buf[0], 42) + + def test_set_int_memoryview(self) -> None: + buf = bytearray(2) + mv = memoryview(buf) + set_int(mv, 0, -1234) + self.assertEqual(struct.unpack(">h", buf)[0], -1234) + + def test_set_word_memoryview(self) -> None: + from snap7.util.setters import set_word + + buf = bytearray(2) + mv = memoryview(buf) + set_word(mv, 0, 65535) + self.assertEqual(struct.unpack(">H", buf)[0], 65535) + + def test_set_real_memoryview(self) -> None: + from snap7.util.setters import set_real + + buf = bytearray(4) + mv = memoryview(buf) + set_real(mv, 0, 123.456) + val = struct.unpack(">f", buf)[0] + self.assertAlmostEqual(val, 123.456, places=2) + + def test_set_dword_memoryview(self) -> None: + from snap7.util.setters import set_dword + + buf = bytearray(4) + mv = memoryview(buf) + set_dword(mv, 0, 0xDEADBEEF) + self.assertEqual(struct.unpack(">I", buf)[0], 0xDEADBEEF) + + def test_set_dint_memoryview(self) -> None: + from snap7.util.setters import set_dint + + buf = bytearray(4) + mv = memoryview(buf) + set_dint(mv, 0, -100000) + self.assertEqual(struct.unpack(">i", buf)[0], -100000) + + def test_set_usint_memoryview(self) -> None: + from snap7.util.setters import set_usint + + buf = bytearray(1) + mv = memoryview(buf) + set_usint(mv, 0, 200) + self.assertEqual(buf[0], 200) + + def test_set_sint_memoryview(self) -> None: + from snap7.util.setters import set_sint + + buf = bytearray(1) + mv = memoryview(buf) + set_sint(mv, 0, -50) + self.assertEqual(struct.unpack(">b", buf)[0], -50) + + def test_set_lreal_memoryview(self) -> None: + from snap7.util.setters import set_lreal + + buf = bytearray(8) + mv = memoryview(buf) + set_lreal(mv, 0, 3.14159265358979) + val = struct.unpack(">d", buf)[0] + self.assertAlmostEqual(val, 3.14159265358979, places=10) + + def test_set_string_memoryview(self) -> None: + from snap7.util.setters import set_string + + buf = bytearray(20) + mv = memoryview(buf) + set_string(mv, 0, "hello", 10) + self.assertEqual(buf[1], 5) # length byte + + def test_set_fstring_memoryview(self) -> None: + buf = bytearray(10) + mv = memoryview(buf) + set_fstring(mv, 0, "hi", 5) + self.assertEqual(chr(buf[0]), "h") + self.assertEqual(chr(buf[1]), "i") + + def test_set_char_memoryview(self) -> None: + from snap7.util.setters import set_char + + buf = bytearray(1) + mv = memoryview(buf) + set_char(mv, 0, "A") + self.assertEqual(buf[0], ord("A")) + + def test_set_date_memoryview(self) -> None: + from snap7.util.setters import set_date + + buf = bytearray(2) + mv = memoryview(buf) + set_date(mv, 0, datetime.date(2024, 3, 27)) + self.assertEqual(buf, bytearray(b"\x30\xd8")) + + def test_set_udint_memoryview(self) -> None: + from snap7.util.setters import set_udint + + buf = bytearray(4) + mv = memoryview(buf) + set_udint(mv, 0, 4294967295) + self.assertEqual(struct.unpack(">I", buf)[0], 4294967295) + + def test_set_uint_memoryview(self) -> None: + from snap7.util.setters import set_uint + + buf = bytearray(2) + mv = memoryview(buf) + set_uint(mv, 0, 12345) + self.assertEqual(struct.unpack(">H", buf)[0], 12345) + + def test_set_time_memoryview(self) -> None: + buf = bytearray(4) + mv = memoryview(buf) + set_time(mv, 0, "1:2:3:4.567") + self.assertNotEqual(buf, bytearray(4)) + + if __name__ == "__main__": unittest.main() From 6ccacf577a311de592441c21648e13e0046cecfc Mon Sep 17 00:00:00 2001 From: Gijs Molenaar Date: Fri, 20 Mar 2026 12:14:31 +0200 Subject: [PATCH 08/19] Add integration tests for server block operations and USERDATA handlers (#644) Adds 32 new tests exercising server-side protocol handlers through real client-server communication: block list/info/upload/download, SZL reads, clock get/set, PLC control (stop/start/compress), and error scenarios for unregistered areas and nonexistent blocks. Co-authored-by: Claude Opus 4.6 --- tests/test_server_coverage.py | 375 ++++++++++++++++++++++++++++++++++ 1 file changed, 375 insertions(+) create mode 100644 tests/test_server_coverage.py diff --git a/tests/test_server_coverage.py b/tests/test_server_coverage.py new file mode 100644 index 00000000..27e1e49c --- /dev/null +++ b/tests/test_server_coverage.py @@ -0,0 +1,375 @@ +"""Integration tests for server block operations, USERDATA handlers, and PLC control. + +These tests exercise the server-side handlers that are not covered by the existing +test_server.py (which only tests the server API) or test_client.py (which focuses +on client-side logic). The goal is to improve coverage for snap7/server/__init__.py +from ~74% to ~85%+ by driving traffic through the protocol handlers. +""" + +import logging + +import pytest +import unittest +from datetime import datetime + +from snap7.client import Client +from snap7.server import Server +from snap7.type import SrvArea, Block + +logging.basicConfig(level=logging.WARNING) + +ip = "127.0.0.1" +SERVER_PORT = 12200 + + +@pytest.mark.server +class TestServerBlockOperations(unittest.TestCase): + """Test block operations through client-server communication.""" + + server: Server = None # type: ignore + + @classmethod + def setUpClass(cls) -> None: + cls.server = Server() + # Register several DBs so list_blocks / list_blocks_of_type have something to report + cls.server.register_area(SrvArea.DB, 1, bytearray(100)) + cls.server.register_area(SrvArea.DB, 2, bytearray(200)) + cls.server.register_area(SrvArea.DB, 3, bytearray(50)) + # Also register other area types + cls.server.register_area(SrvArea.MK, 0, bytearray(64)) + cls.server.register_area(SrvArea.PA, 0, bytearray(64)) + cls.server.register_area(SrvArea.PE, 0, bytearray(64)) + cls.server.register_area(SrvArea.TM, 0, bytearray(64)) + cls.server.register_area(SrvArea.CT, 0, bytearray(64)) + cls.server.start(tcp_port=SERVER_PORT) + + @classmethod + def tearDownClass(cls) -> None: + if cls.server: + cls.server.stop() + cls.server.destroy() + + def setUp(self) -> None: + self.client = Client() + self.client.connect(ip, 0, 1, SERVER_PORT) + + def tearDown(self) -> None: + self.client.disconnect() + self.client.destroy() + + # ------------------------------------------------------------------ + # list_blocks + # ------------------------------------------------------------------ + def test_list_blocks(self) -> None: + """list_blocks() should return counts; DBCount >= 3 since we registered 3 DBs.""" + bl = self.client.list_blocks() + self.assertGreaterEqual(bl.DBCount, 3) + # OB/FB/FC should be 0 since the emulator only tracks DBs + self.assertEqual(bl.OBCount, 0) + self.assertEqual(bl.FBCount, 0) + self.assertEqual(bl.FCCount, 0) + + # ------------------------------------------------------------------ + # list_blocks_of_type + # ------------------------------------------------------------------ + def test_list_blocks_of_type_db(self) -> None: + """list_blocks_of_type(DB) should include the DB numbers we registered.""" + block_nums = self.client.list_blocks_of_type(Block.DB, 100) + self.assertIn(1, block_nums) + self.assertIn(2, block_nums) + self.assertIn(3, block_nums) + + def test_list_blocks_of_type_ob(self) -> None: + """list_blocks_of_type(OB) should return an empty list (no OBs registered).""" + block_nums = self.client.list_blocks_of_type(Block.OB, 100) + self.assertEqual(block_nums, []) + + # ------------------------------------------------------------------ + # get_block_info + # ------------------------------------------------------------------ + def test_get_block_info(self) -> None: + """get_block_info for a registered DB should return valid metadata.""" + info = self.client.get_block_info(Block.DB, 1) + self.assertEqual(info.MC7Size, 100) # matches registered size + self.assertEqual(info.BlkNumber, 1) + + def test_get_block_info_db2(self) -> None: + """get_block_info for DB2 with size 200.""" + info = self.client.get_block_info(Block.DB, 2) + self.assertEqual(info.MC7Size, 200) + self.assertEqual(info.BlkNumber, 2) + + # ------------------------------------------------------------------ + # upload (block transfer: START_UPLOAD -> UPLOAD -> END_UPLOAD) + # ------------------------------------------------------------------ + def test_upload(self) -> None: + """Upload a DB from the server and verify the returned data length.""" + # Write known data to DB1 first + test_data = bytearray(range(10)) + self.client.db_write(1, 0, test_data) + + # Upload the block + block_data = self.client.upload(1) + self.assertGreater(len(block_data), 0) + # Verify the first bytes match what we wrote + self.assertEqual(block_data[:10], test_data) + + def test_full_upload(self) -> None: + """full_upload should return block data and its size.""" + data, size = self.client.full_upload(Block.DB, 1) + self.assertGreater(size, 0) + self.assertEqual(len(data), size) + + # ------------------------------------------------------------------ + # download (block transfer: REQUEST_DOWNLOAD -> DOWNLOAD_BLOCK -> DOWNLOAD_ENDED) + # ------------------------------------------------------------------ + def test_download(self) -> None: + """Download data to a registered DB on the server.""" + download_data = bytearray([0xAA, 0xBB, 0xCC, 0xDD]) + result = self.client.download(download_data, block_num=1) + self.assertEqual(result, 0) + + # Verify the data was written by reading it back + read_back = self.client.db_read(1, 0, 4) + self.assertEqual(read_back, download_data) + + +@pytest.mark.server +class TestServerUserdataOperations(unittest.TestCase): + """Test USERDATA handlers (SZL, clock, CPU state) through client-server communication.""" + + server: Server = None # type: ignore + + @classmethod + def setUpClass(cls) -> None: + cls.server = Server() + cls.server.register_area(SrvArea.DB, 1, bytearray(100)) + cls.server.start(tcp_port=SERVER_PORT + 1) + + @classmethod + def tearDownClass(cls) -> None: + if cls.server: + cls.server.stop() + cls.server.destroy() + + def setUp(self) -> None: + self.client = Client() + self.client.connect(ip, 0, 1, SERVER_PORT + 1) + + def tearDown(self) -> None: + self.client.disconnect() + self.client.destroy() + + # ------------------------------------------------------------------ + # read_szl + # ------------------------------------------------------------------ + def test_read_szl_0x001c(self) -> None: + """read_szl(0x001C) should return component identification data.""" + szl = self.client.read_szl(0x001C, 0) + self.assertGreater(szl.Header.LengthDR, 0) + + def test_read_szl_0x0011(self) -> None: + """read_szl(0x0011) should return module identification data.""" + szl = self.client.read_szl(0x0011, 0) + self.assertGreater(szl.Header.LengthDR, 0) + + def test_read_szl_0x0131(self) -> None: + """read_szl(0x0131) should return communication parameters.""" + szl = self.client.read_szl(0x0131, 0) + self.assertGreater(szl.Header.LengthDR, 0) + + def test_read_szl_0x0232(self) -> None: + """read_szl(0x0232) should return protection level data.""" + szl = self.client.read_szl(0x0232, 0) + self.assertGreater(szl.Header.LengthDR, 0) + + def test_read_szl_0x0000(self) -> None: + """read_szl(0x0000) should return the list of available SZL IDs.""" + szl = self.client.read_szl(0x0000, 0) + self.assertGreater(szl.Header.LengthDR, 0) + + def test_read_szl_list(self) -> None: + """read_szl_list should return raw bytes of available SZL IDs.""" + data = self.client.read_szl_list() + self.assertIsInstance(data, bytes) + self.assertGreater(len(data), 0) + + # ------------------------------------------------------------------ + # get_cpu_info (uses read_szl 0x001C internally) + # ------------------------------------------------------------------ + def test_get_cpu_info(self) -> None: + """get_cpu_info should populate the S7CpuInfo structure.""" + info = self.client.get_cpu_info() + # The emulated server returns "CPU 315-2 PN/DP" + self.assertIn(b"CPU", info.ModuleTypeName) + + # ------------------------------------------------------------------ + # get_order_code (uses read_szl 0x0011 internally) + # ------------------------------------------------------------------ + def test_get_order_code(self) -> None: + """get_order_code should return order code data.""" + oc = self.client.get_order_code() + self.assertIn(b"6ES7", oc.OrderCode) + + # ------------------------------------------------------------------ + # get_cp_info (uses read_szl 0x0131 internally) + # ------------------------------------------------------------------ + def test_get_cp_info(self) -> None: + """get_cp_info should return communication parameters.""" + cp = self.client.get_cp_info() + self.assertGreater(cp.MaxPduLength, 0) + self.assertGreater(cp.MaxConnections, 0) + + # ------------------------------------------------------------------ + # get_protection (uses read_szl 0x0232 internally) + # ------------------------------------------------------------------ + def test_get_protection(self) -> None: + """get_protection should return protection settings.""" + prot = self.client.get_protection() + # Emulator returns no protection (sch_schal=1) + self.assertEqual(prot.sch_schal, 1) + + # ------------------------------------------------------------------ + # get/set PLC datetime (clock USERDATA handlers) + # ------------------------------------------------------------------ + def test_get_plc_datetime(self) -> None: + """get_plc_datetime should return a valid datetime object.""" + dt = self.client.get_plc_datetime() + self.assertIsInstance(dt, datetime) + # Should be recent (within last minute) + now = datetime.now() + delta = abs((now - dt).total_seconds()) + self.assertLess(delta, 60) + + def test_set_plc_datetime(self) -> None: + """set_plc_datetime should succeed (returns 0).""" + test_dt = datetime(2025, 6, 15, 12, 30, 45) + result = self.client.set_plc_datetime(test_dt) + self.assertEqual(result, 0) + + def test_set_plc_system_datetime(self) -> None: + """set_plc_system_datetime should succeed.""" + result = self.client.set_plc_system_datetime() + self.assertEqual(result, 0) + + # ------------------------------------------------------------------ + # get_cpu_state (SZL-based CPU state request) + # ------------------------------------------------------------------ + def test_get_cpu_state(self) -> None: + """get_cpu_state should return a string state.""" + state = self.client.get_cpu_state() + self.assertIsInstance(state, str) + + +@pytest.mark.server +class TestServerPLCControl(unittest.TestCase): + """Test PLC control operations (stop/start) through client-server communication.""" + + server: Server = None # type: ignore + + @classmethod + def setUpClass(cls) -> None: + cls.server = Server() + cls.server.register_area(SrvArea.DB, 1, bytearray(100)) + cls.server.start(tcp_port=SERVER_PORT + 2) + + @classmethod + def tearDownClass(cls) -> None: + if cls.server: + cls.server.stop() + cls.server.destroy() + + def setUp(self) -> None: + self.client = Client() + self.client.connect(ip, 0, 1, SERVER_PORT + 2) + + def tearDown(self) -> None: + self.client.disconnect() + self.client.destroy() + + def test_plc_stop(self) -> None: + """plc_stop should succeed and set the server CPU state to STOP.""" + result = self.client.plc_stop() + self.assertEqual(result, 0) + + def test_plc_hot_start(self) -> None: + """plc_hot_start should succeed.""" + result = self.client.plc_hot_start() + self.assertEqual(result, 0) + + def test_plc_cold_start(self) -> None: + """plc_cold_start should succeed.""" + result = self.client.plc_cold_start() + self.assertEqual(result, 0) + + def test_plc_stop_then_start(self) -> None: + """Stopping then starting the PLC should work in sequence.""" + self.assertEqual(self.client.plc_stop(), 0) + self.assertEqual(self.client.plc_hot_start(), 0) + + def test_compress(self) -> None: + """compress should succeed.""" + result = self.client.compress(timeout=1000) + self.assertEqual(result, 0) + + def test_copy_ram_to_rom(self) -> None: + """copy_ram_to_rom should succeed.""" + result = self.client.copy_ram_to_rom(timeout=1000) + self.assertEqual(result, 0) + + +@pytest.mark.server +class TestServerErrorScenarios(unittest.TestCase): + """Test error handling paths in the server.""" + + server: Server = None # type: ignore + + @classmethod + def setUpClass(cls) -> None: + cls.server = Server() + # Only register DB1 with a small area + cls.server.register_area(SrvArea.DB, 1, bytearray(10)) + cls.server.start(tcp_port=SERVER_PORT + 3) + + @classmethod + def tearDownClass(cls) -> None: + if cls.server: + cls.server.stop() + cls.server.destroy() + + def setUp(self) -> None: + self.client = Client() + self.client.connect(ip, 0, 1, SERVER_PORT + 3) + + def tearDown(self) -> None: + self.client.disconnect() + self.client.destroy() + + def test_read_unregistered_db(self) -> None: + """Reading from an unregistered DB should still return data (server returns dummy data).""" + # The server returns dummy data for unregistered areas rather than an error + data = self.client.db_read(99, 0, 4) + self.assertEqual(len(data), 4) + + def test_write_beyond_area_bounds(self) -> None: + """Writing beyond area bounds should raise an error.""" + # DB1 is only 10 bytes, writing 20 bytes at offset 0 should fail + with self.assertRaises(Exception): + self.client.db_write(1, 0, bytearray(20)) + + def test_get_block_info_nonexistent(self) -> None: + """get_block_info for a non-existent block should raise an error.""" + with self.assertRaises(Exception): + self.client.get_block_info(Block.DB, 999) + + def test_upload_nonexistent_block(self) -> None: + """Uploading a non-existent block returns empty data (server has no data for that block).""" + # The server defaults to block_num=1 for unknown blocks due to parsing fallback, + # so the upload still completes but returns the default block's data. + # We just verify the operation doesn't crash. + data = self.client.upload(999) + self.assertIsInstance(data, bytearray) + + +if __name__ == "__main__": + unittest.main() From 4bded550111e2b8f95c28deaf0f8ff4df82a3e68 Mon Sep 17 00:00:00 2001 From: Gijs Molenaar Date: Fri, 20 Mar 2026 12:14:40 +0200 Subject: [PATCH 09/19] Add tests for snap7/logo.py to improve coverage from 53% to 97% (#643) Tests parse_address() for all address types (V, VW, VD, V.bit) and invalid inputs, plus integration tests for Logo read/write against the built-in server covering byte, word, dword, and bit operations including boundary values and read-modify-write bit logic. Co-authored-by: Claude Opus 4.6 --- tests/test_logo_coverage.py | 260 ++++++++++++++++++++++++++++++++++++ 1 file changed, 260 insertions(+) create mode 100644 tests/test_logo_coverage.py diff --git a/tests/test_logo_coverage.py b/tests/test_logo_coverage.py new file mode 100644 index 00000000..8437d585 --- /dev/null +++ b/tests/test_logo_coverage.py @@ -0,0 +1,260 @@ +"""Tests for snap7/logo.py to improve coverage of parse_address, read, and write.""" + +import logging +import unittest +from typing import Optional + +import pytest + +from snap7.logo import Logo, parse_address +from snap7.server import Server +from snap7.type import SrvArea, WordLen + +logging.basicConfig(level=logging.WARNING) + +ip = "127.0.0.1" +tcpport = 11102 +db_number = 1 + + +# --------------------------------------------------------------------------- +# parse_address() unit tests (no server needed) +# --------------------------------------------------------------------------- + + +@pytest.mark.logo +class TestParseAddress(unittest.TestCase): + """Test every branch of parse_address().""" + + def test_byte_address(self) -> None: + start, wl = parse_address("V10") + self.assertEqual(start, 10) + self.assertEqual(wl, WordLen.Byte) + + def test_byte_address_large(self) -> None: + start, wl = parse_address("V999") + self.assertEqual(start, 999) + self.assertEqual(wl, WordLen.Byte) + + def test_word_address(self) -> None: + start, wl = parse_address("VW20") + self.assertEqual(start, 20) + self.assertEqual(wl, WordLen.Word) + + def test_word_address_zero(self) -> None: + start, wl = parse_address("VW0") + self.assertEqual(start, 0) + self.assertEqual(wl, WordLen.Word) + + def test_dword_address(self) -> None: + start, wl = parse_address("VD30") + self.assertEqual(start, 30) + self.assertEqual(wl, WordLen.DWord) + + def test_bit_address(self) -> None: + start, wl = parse_address("V10.3") + # bit offset = 10*8 + 3 = 83 + self.assertEqual(start, 83) + self.assertEqual(wl, WordLen.Bit) + + def test_bit_address_zero(self) -> None: + start, wl = parse_address("V0.0") + self.assertEqual(start, 0) + self.assertEqual(wl, WordLen.Bit) + + def test_bit_address_high_bit(self) -> None: + start, wl = parse_address("V0.7") + self.assertEqual(start, 7) + self.assertEqual(wl, WordLen.Bit) + + def test_invalid_address_raises(self) -> None: + with self.assertRaises(ValueError): + parse_address("INVALID") + + def test_invalid_address_empty(self) -> None: + with self.assertRaises(ValueError): + parse_address("") + + def test_invalid_address_wrong_prefix(self) -> None: + with self.assertRaises(ValueError): + parse_address("M10") + + +# --------------------------------------------------------------------------- +# Integration tests: Logo client against the built-in Server +# --------------------------------------------------------------------------- + + +@pytest.mark.logo +class TestLogoReadWrite(unittest.TestCase): + """Test Logo read/write against a real server with DB1 registered.""" + + server: Optional[Server] = None + db_data: bytearray + + @classmethod + def setUpClass(cls) -> None: + cls.db_data = bytearray(256) + cls.server = Server() + cls.server.register_area(SrvArea.DB, 0, bytearray(256)) + cls.server.register_area(SrvArea.DB, 1, cls.db_data) + cls.server.start(tcp_port=tcpport) + + @classmethod + def tearDownClass(cls) -> None: + if cls.server: + cls.server.stop() + cls.server.destroy() + + def setUp(self) -> None: + self.client = Logo() + self.client.connect(ip, 0x1000, 0x2000, tcpport) + + def tearDown(self) -> None: + self.client.disconnect() + self.client.destroy() + + # -- read tests --------------------------------------------------------- + + def test_read_byte(self) -> None: + """Write a known byte into DB1 via client, then read it back.""" + self.client.write("V5", 0xAB) + result = self.client.read("V5") + self.assertEqual(result, 0xAB) + + def test_read_word(self) -> None: + """Write and read back a word (signed 16-bit big-endian).""" + self.client.write("VW10", 1234) + result = self.client.read("VW10") + self.assertEqual(result, 1234) + + def test_read_word_negative(self) -> None: + """Words are signed — negative values should round-trip.""" + self.client.write("VW12", -500) + result = self.client.read("VW12") + self.assertEqual(result, -500) + + def test_read_dword(self) -> None: + """Write and read back a dword (signed 32-bit big-endian).""" + self.client.write("VD20", 70000) + result = self.client.read("VD20") + self.assertEqual(result, 70000) + + def test_read_dword_negative(self) -> None: + """DWords are signed — negative values should round-trip.""" + self.client.write("VD24", -123456) + result = self.client.read("VD24") + self.assertEqual(result, -123456) + + def test_read_bit_set(self) -> None: + """Write bit=1, then read it back.""" + self.client.write("V50.2", 1) + result = self.client.read("V50.2") + self.assertEqual(result, 1) + + def test_read_bit_clear(self) -> None: + """Write bit=0, then read it back.""" + # First set it so we know we're actually clearing + self.client.write("V51.5", 1) + self.assertEqual(self.client.read("V51.5"), 1) + self.client.write("V51.5", 0) + result = self.client.read("V51.5") + self.assertEqual(result, 0) + + def test_read_bit_zero(self) -> None: + """Read bit 0 of byte 0.""" + self.client.write("V60", 0) # clear byte first + self.client.write("V60.0", 1) + self.assertEqual(self.client.read("V60.0"), 1) + # Other bits should be 0 + self.assertEqual(self.client.read("V60.1"), 0) + + def test_read_bit_seven(self) -> None: + """Read bit 7 of a byte.""" + self.client.write("V61", 0) # clear byte + self.client.write("V61.7", 1) + self.assertEqual(self.client.read("V61.7"), 1) + # Byte should be 0x80 + self.assertEqual(self.client.read("V61"), 0x80) + + # -- write tests -------------------------------------------------------- + + def test_write_byte(self) -> None: + """Write a byte and verify.""" + result = self.client.write("V70", 42) + self.assertEqual(result, 0) + self.assertEqual(self.client.read("V70"), 42) + + def test_write_word(self) -> None: + """Write a word and verify.""" + result = self.client.write("VW80", 2000) + self.assertEqual(result, 0) + self.assertEqual(self.client.read("VW80"), 2000) + + def test_write_dword(self) -> None: + """Write a dword and verify.""" + result = self.client.write("VD90", 100000) + self.assertEqual(result, 0) + self.assertEqual(self.client.read("VD90"), 100000) + + def test_write_bit_true(self) -> None: + """Write a bit to True.""" + result = self.client.write("V100.4", 1) + self.assertEqual(result, 0) + self.assertEqual(self.client.read("V100.4"), 1) + + def test_write_bit_false(self) -> None: + """Write a bit to False after setting it.""" + self.client.write("V101.6", 1) + result = self.client.write("V101.6", 0) + self.assertEqual(result, 0) + self.assertEqual(self.client.read("V101.6"), 0) + + def test_write_bit_preserves_other_bits(self) -> None: + """Setting one bit should not disturb other bits in the same byte.""" + # Write 0xFF to the byte + self.client.write("V110", 0xFF) + # Clear bit 3 + self.client.write("V110.3", 0) + # Byte should now be 0xF7 (all bits set except bit 3) + self.assertEqual(self.client.read("V110"), 0xF7) + # Set bit 3 back + self.client.write("V110.3", 1) + self.assertEqual(self.client.read("V110"), 0xFF) + + def test_write_byte_boundary_values(self) -> None: + """Test boundary values: 0 and 255.""" + self.client.write("V120", 0) + self.assertEqual(self.client.read("V120"), 0) + self.client.write("V120", 255) + self.assertEqual(self.client.read("V120"), 255) + + def test_write_word_boundary_values(self) -> None: + """Test word boundary values: max positive and max negative.""" + self.client.write("VW130", 32767) + self.assertEqual(self.client.read("VW130"), 32767) + self.client.write("VW130", -32768) + self.assertEqual(self.client.read("VW130"), -32768) + + def test_write_dword_boundary_values(self) -> None: + """Test dword boundary values.""" + self.client.write("VD140", 2147483647) + self.assertEqual(self.client.read("VD140"), 2147483647) + self.client.write("VD140", -2147483648) + self.assertEqual(self.client.read("VD140"), -2147483648) + + def test_read_write_multiple_addresses(self) -> None: + """Verify different address types can coexist.""" + self.client.write("V200", 0x42) + self.client.write("VW202", 1000) + self.client.write("VD204", 50000) + self.client.write("V208.1", 1) + + self.assertEqual(self.client.read("V200"), 0x42) + self.assertEqual(self.client.read("VW202"), 1000) + self.assertEqual(self.client.read("VD204"), 50000) + self.assertEqual(self.client.read("V208.1"), 1) + + +if __name__ == "__main__": + unittest.main() From 5443402f503558d870bd0906f2ae8a12704c7779 Mon Sep 17 00:00:00 2001 From: Gijs Molenaar Date: Fri, 20 Mar 2026 12:14:50 +0200 Subject: [PATCH 10/19] Add tests to improve coverage from 78% to 84% (#642) * Add tests to improve coverage from 78% to ~85% Add test suites for untested code paths that don't require a real PLC: - error.py: error routing, check_error(), error_wrap() decorator - connection.py: socket mocking, COTP parsing, exception paths - server/__main__.py: CLI entrypoint test - s7protocol.py: response parser tests with crafted PDUs - util/db.py: DB/Row type conversions, dict-like interface Co-Authored-By: Claude Opus 4.6 * Fix test_server_cli.py when click is not installed Use pytest.importorskip to gracefully skip CLI tests when click (an optional dependency) is not available in the test environment. Co-Authored-By: Claude Opus 4.6 --------- Co-authored-by: Claude Opus 4.6 --- tests/test_connection.py | 475 ++++++++++++++++++++++++++ tests/test_db_coverage.py | 546 ++++++++++++++++++++++++++++++ tests/test_error.py | 181 ++++++++++ tests/test_s7protocol_coverage.py | 535 +++++++++++++++++++++++++++++ tests/test_server_cli.py | 30 ++ 5 files changed, 1767 insertions(+) create mode 100644 tests/test_connection.py create mode 100644 tests/test_db_coverage.py create mode 100644 tests/test_error.py create mode 100644 tests/test_s7protocol_coverage.py create mode 100644 tests/test_server_cli.py diff --git a/tests/test_connection.py b/tests/test_connection.py new file mode 100644 index 00000000..124956b0 --- /dev/null +++ b/tests/test_connection.py @@ -0,0 +1,475 @@ +"""Tests for snap7.connection module — socket mocking, COTP parsing, exception paths.""" + +import socket +import struct +import pytest +from unittest.mock import patch, MagicMock + +from snap7.connection import ISOTCPConnection, TPDUSize +from snap7.error import S7ConnectionError, S7TimeoutError + + +class TestTPDUSize: + """Test TPDUSize enum values.""" + + def test_sizes(self) -> None: + assert TPDUSize.S_128 == 0x07 + assert TPDUSize.S_1024 == 0x0A + assert TPDUSize.S_8192 == 0x0D + + +class TestISOTCPConnectionInit: + """Test constructor defaults.""" + + def test_defaults(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + assert conn.host == "1.2.3.4" + assert conn.port == 102 + assert conn.connected is False + assert conn.socket is None + assert conn.pdu_size == 240 + + def test_custom_params(self) -> None: + conn = ISOTCPConnection("1.2.3.4", port=1102, local_tsap=0x200, remote_tsap=0x300, tpdu_size=TPDUSize.S_512) + assert conn.port == 1102 + assert conn.local_tsap == 0x200 + assert conn.remote_tsap == 0x300 + assert conn.tpdu_size == TPDUSize.S_512 + + +class TestBuildTPKT: + """Test TPKT frame building.""" + + def test_tpkt_structure(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + payload = b"\x01\x02\x03" + frame = conn._build_tpkt(payload) + assert frame[:2] == b"\x03\x00" # version=3, reserved=0 + length = struct.unpack(">H", frame[2:4])[0] + assert length == 7 # 4 header + 3 payload + assert frame[4:] == payload + + +class TestBuildCOTPCR: + """Test COTP Connection Request building.""" + + def test_cr_structure(self) -> None: + conn = ISOTCPConnection("1.2.3.4", local_tsap=0x0100, remote_tsap=0x0102) + cr = conn._build_cotp_cr() + # First byte = PDU length + pdu_type = cr[1] + assert pdu_type == 0xE0 # COTP_CR + # Should contain parameters for TSAP and PDU size + assert len(cr) > 7 + + +class TestBuildCOTPDT: + """Test COTP Data Transfer building.""" + + def test_dt_structure(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + data = b"\xaa\xbb" + dt = conn._build_cotp_dt(data) + assert dt[0] == 2 # PDU length + assert dt[1] == 0xF0 # COTP_DT + assert dt[2] == 0x80 # EOT + assert dt[3:] == data + + +class TestParseCOTPCC: + """Test COTP Connection Confirm parsing.""" + + def test_valid_cc(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + # Build a valid CC: len, type, dst_ref, src_ref, class_opt + cc_data = struct.pack(">BBHHB", 6, 0xD0, 0x1234, 0x0001, 0x00) + conn._parse_cotp_cc(cc_data) + assert conn.dst_ref == 0x1234 + + def test_cc_too_short(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + with pytest.raises(S7ConnectionError, match="too short"): + conn._parse_cotp_cc(b"\x00\x01\x02") + + def test_cc_wrong_type(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + cc_data = struct.pack(">BBHHB", 6, 0xE0, 0x0000, 0x0001, 0x00) # CR instead of CC + with pytest.raises(S7ConnectionError, match="Expected COTP CC"): + conn._parse_cotp_cc(cc_data) + + def test_cc_with_pdu_size_param_1byte(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + base = struct.pack(">BBHHB", 10, 0xD0, 0x0001, 0x0001, 0x00) + # PDU size parameter: code=0xC0, len=1, value=0x0A (=1024) + param = struct.pack(">BBB", 0xC0, 1, 0x0A) + conn._parse_cotp_cc(base + param) + assert conn.pdu_size == 1024 + + def test_cc_with_pdu_size_param_2byte(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + base = struct.pack(">BBHHB", 11, 0xD0, 0x0001, 0x0001, 0x00) + # PDU size parameter: code=0xC0, len=2, value=2048 + param = struct.pack(">BBH", 0xC0, 2, 2048) + conn._parse_cotp_cc(base + param) + assert conn.pdu_size == 2048 + + +class TestParseCOTPParameters: + """Test COTP parameter parsing edge cases.""" + + def test_unknown_parameter(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + # Unknown param code 0xFF, length 1, data 0x00 + params = struct.pack(">BBB", 0xFF, 1, 0x00) + conn._parse_cotp_parameters(params) + # Should not crash; pdu_size should remain default + assert conn.pdu_size == 240 + + def test_truncated_params(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + # Just one byte — should break out of loop + conn._parse_cotp_parameters(b"\xc0") + assert conn.pdu_size == 240 + + def test_param_len_exceeds_data(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + # code=0xC0, len=5, but only 1 byte of data follows + params = struct.pack(">BBB", 0xC0, 5, 0x0A) + conn._parse_cotp_parameters(params) + # Should break early without error + assert conn.pdu_size == 240 + + +class TestParseCOTPData: + """Test COTP Data Transfer parsing.""" + + def test_valid_dt(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + pdu = struct.pack(">BBB", 2, 0xF0, 0x80) + b"\xde\xad" + result = conn._parse_cotp_data(pdu) + assert result == b"\xde\xad" + + def test_dt_too_short(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + with pytest.raises(S7ConnectionError, match="too short"): + conn._parse_cotp_data(b"\x02") + + def test_dt_wrong_type(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + pdu = struct.pack(">BBB", 2, 0xD0, 0x80) # CC instead of DT + with pytest.raises(S7ConnectionError, match="Expected COTP DT"): + conn._parse_cotp_data(pdu) + + +class TestSendData: + """Test send_data() error paths.""" + + def test_send_when_not_connected(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + with pytest.raises(S7ConnectionError, match="Not connected"): + conn.send_data(b"\x00") + + def test_send_socket_error(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + conn.connected = True + conn.socket = MagicMock() + conn.socket.sendall.side_effect = socket.error("broken pipe") + with pytest.raises(S7ConnectionError, match="Send failed"): + conn.send_data(b"\x00") + assert conn.connected is False + + +class TestReceiveData: + """Test receive_data() error paths.""" + + def test_receive_when_not_connected(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + with pytest.raises(S7ConnectionError, match="Not connected"): + conn.receive_data() + + def test_receive_invalid_tpkt_version(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + conn.connected = True + mock_socket = MagicMock() + conn.socket = mock_socket + # TPKT with version 5 instead of 3 + mock_socket.recv.return_value = struct.pack(">BBH", 5, 0, 10) + with pytest.raises(S7ConnectionError, match="Invalid TPKT version"): + conn.receive_data() + + def test_receive_invalid_tpkt_length(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + conn.connected = True + mock_socket = MagicMock() + conn.socket = mock_socket + # Length = 3, remaining = -1 + mock_socket.recv.return_value = struct.pack(">BBH", 3, 0, 3) + with pytest.raises(S7ConnectionError, match="Invalid TPKT length"): + conn.receive_data() + + def test_receive_timeout(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + conn.connected = True + mock_socket = MagicMock() + conn.socket = mock_socket + mock_socket.recv.side_effect = socket.timeout("timeout") + with pytest.raises(S7TimeoutError, match="Receive timeout"): + conn.receive_data() + assert conn.connected is False + + def test_receive_socket_error(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + conn.connected = True + mock_socket = MagicMock() + conn.socket = mock_socket + # First recv returns valid TPKT header, second raises error + mock_socket.recv.side_effect = [struct.pack(">BBH", 3, 0, 10), socket.error("reset")] + with pytest.raises(S7ConnectionError, match="Receive error"): + conn.receive_data() + assert conn.connected is False + + +class TestRecvExact: + """Test _recv_exact() with various scenarios.""" + + def test_socket_none(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + with pytest.raises(S7ConnectionError, match="Socket not initialized"): + conn._recv_exact(4) + + def test_connection_closed(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + conn.socket = MagicMock() + conn.socket.recv.return_value = b"" # empty = connection closed + with pytest.raises(S7ConnectionError, match="Connection closed"): + conn._recv_exact(4) + assert conn.connected is False + + def test_partial_reads(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + conn.socket = MagicMock() + conn.socket.recv.side_effect = [b"\x01\x02", b"\x03\x04"] + result = conn._recv_exact(4) + assert result == b"\x01\x02\x03\x04" + + def test_timeout(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + conn.socket = MagicMock() + conn.socket.recv.side_effect = socket.timeout("timeout") + with pytest.raises(S7TimeoutError): + conn._recv_exact(4) + + def test_socket_error(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + conn.socket = MagicMock() + conn.socket.recv.side_effect = socket.error("broken") + with pytest.raises(S7ConnectionError, match="Receive error"): + conn._recv_exact(4) + + +class TestSendCOTPDisconnect: + """Test _send_cotp_disconnect().""" + + def test_disconnect_no_socket(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + conn.socket = None + # Should return without error + conn._send_cotp_disconnect() + + def test_disconnect_sends_dr(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + mock_socket = MagicMock() + conn.socket = mock_socket + conn._send_cotp_disconnect() + mock_socket.sendall.assert_called_once() + + def test_disconnect_ignores_socket_error(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + mock_socket = MagicMock() + mock_socket.sendall.side_effect = socket.error("broken") + conn.socket = mock_socket + # Should not raise + conn._send_cotp_disconnect() + + +class TestConnect: + """Test connect() orchestration.""" + + @patch.object(ISOTCPConnection, "_tcp_connect") + @patch.object(ISOTCPConnection, "_iso_connect") + def test_successful_connect(self, mock_iso: MagicMock, mock_tcp: MagicMock) -> None: + conn = ISOTCPConnection("1.2.3.4") + conn.connect(timeout=2.0) + assert conn.connected is True + assert conn.timeout == 2.0 + mock_tcp.assert_called_once() + mock_iso.assert_called_once() + + @patch.object(ISOTCPConnection, "_tcp_connect", side_effect=OSError("connection refused")) + @patch.object(ISOTCPConnection, "disconnect") + def test_connect_failure_wraps_in_s7error(self, mock_disc: MagicMock, mock_tcp: MagicMock) -> None: + conn = ISOTCPConnection("1.2.3.4") + with pytest.raises(S7ConnectionError, match="Connection failed"): + conn.connect() + mock_disc.assert_called_once() + + @patch.object(ISOTCPConnection, "_tcp_connect") + @patch.object(ISOTCPConnection, "_iso_connect", side_effect=S7ConnectionError("COTP fail")) + @patch.object(ISOTCPConnection, "disconnect") + def test_connect_reraises_s7_errors(self, mock_disc: MagicMock, mock_iso: MagicMock, mock_tcp: MagicMock) -> None: + conn = ISOTCPConnection("1.2.3.4") + with pytest.raises(S7ConnectionError, match="COTP fail"): + conn.connect() + + +class TestDisconnect: + """Test disconnect() behavior.""" + + def test_disconnect_when_no_socket(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + # Should not raise + conn.disconnect() + + def test_disconnect_closes_socket(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + mock_socket = MagicMock() + conn.socket = mock_socket + conn.connected = True + conn.disconnect() + mock_socket.close.assert_called_once() + assert conn.socket is None + assert conn.connected is False + + def test_disconnect_ignores_errors(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + mock_socket = MagicMock() + mock_socket.close.side_effect = OSError("already closed") + conn.socket = mock_socket + conn.connected = False + conn.disconnect() + assert conn.socket is None + + +class TestContextManager: + """Test __enter__ / __exit__.""" + + def test_enter_returns_self(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + assert conn.__enter__() is conn + + def test_exit_calls_disconnect(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + conn.socket = MagicMock() + conn.connected = True + conn.__exit__(None, None, None) + assert conn.socket is None + assert conn.connected is False + + def test_context_manager_protocol(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + with conn as c: + assert c is conn + assert conn.connected is False + + +class TestCheckConnection: + """Test check_connection() method.""" + + def test_not_connected(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + assert conn.check_connection() is False + + def test_socket_none(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + conn.connected = True + conn.socket = None + assert conn.check_connection() is False + + def test_connection_alive_no_data(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + conn.connected = True + mock_socket = MagicMock() + conn.socket = mock_socket + mock_socket.gettimeout.return_value = 5.0 + mock_socket.recv.side_effect = BlockingIOError + assert conn.check_connection() is True + + def test_connection_alive_with_data(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + conn.connected = True + mock_socket = MagicMock() + conn.socket = mock_socket + mock_socket.gettimeout.return_value = 5.0 + mock_socket.recv.return_value = b"\x00" + assert conn.check_connection() is True + + def test_connection_closed_by_peer(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + conn.connected = True + mock_socket = MagicMock() + conn.socket = mock_socket + mock_socket.gettimeout.return_value = 5.0 + mock_socket.recv.return_value = b"" + assert conn.check_connection() is False + assert conn.connected is False + + def test_connection_socket_error(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + conn.connected = True + mock_socket = MagicMock() + conn.socket = mock_socket + mock_socket.gettimeout.return_value = 5.0 + mock_socket.recv.side_effect = socket.error("reset") + assert conn.check_connection() is False + assert conn.connected is False + + def test_connection_exception_in_outer_try(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + conn.connected = True + mock_socket = MagicMock() + conn.socket = mock_socket + mock_socket.gettimeout.side_effect = Exception("unexpected") + assert conn.check_connection() is False + + +class TestTCPConnect: + """Test _tcp_connect().""" + + @patch("snap7.connection.socket.socket") + def test_tcp_connect_failure(self, mock_socket_cls: MagicMock) -> None: + mock_sock = MagicMock() + mock_socket_cls.return_value = mock_sock + mock_sock.connect.side_effect = socket.error("refused") + conn = ISOTCPConnection("1.2.3.4") + with pytest.raises(S7ConnectionError, match="TCP connection failed"): + conn._tcp_connect() + + @patch("snap7.connection.socket.socket") + def test_tcp_connect_success(self, mock_socket_cls: MagicMock) -> None: + mock_sock = MagicMock() + mock_socket_cls.return_value = mock_sock + conn = ISOTCPConnection("1.2.3.4") + conn._tcp_connect() + mock_sock.settimeout.assert_called_once() + mock_sock.connect.assert_called_once_with(("1.2.3.4", 102)) + + +class TestISOConnect: + """Test _iso_connect().""" + + def test_iso_connect_no_socket(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + conn.socket = None + with pytest.raises(S7ConnectionError, match="Socket not initialized"): + conn._iso_connect() + + def test_iso_connect_bad_tpkt_version(self) -> None: + conn = ISOTCPConnection("1.2.3.4") + mock_socket = MagicMock() + conn.socket = mock_socket + # Build a valid CC response wrapped in a bad TPKT + cc = struct.pack(">BBHHB", 6, 0xD0, 0x0001, 0x0001, 0x00) + bad_tpkt = struct.pack(">BBH", 5, 0, 4 + len(cc)) + mock_socket.recv.side_effect = [bad_tpkt, cc] + with pytest.raises(S7ConnectionError, match="Invalid TPKT version"): + conn._iso_connect() diff --git a/tests/test_db_coverage.py b/tests/test_db_coverage.py new file mode 100644 index 00000000..660133fb --- /dev/null +++ b/tests/test_db_coverage.py @@ -0,0 +1,546 @@ +"""Tests for snap7.util.db — DB/Row dict-like interface, read/write with mocked client, type conversions.""" + +import datetime +import logging +import struct +import pytest +from unittest.mock import MagicMock + +from snap7 import DB, Row +from snap7.type import Area +from snap7.util.db import print_row + +# Reuse the test spec and bytearray from test_util.py +test_spec = """ +4 ID INT +6 NAME STRING[4] + +12.0 testbool1 BOOL +12.1 testbool2 BOOL +13 testReal REAL +17 testDword DWORD +21 testint2 INT +23 testDint DINT +27 testWord WORD +29 testS5time S5TIME +31 testdateandtime DATE_AND_TIME +43 testusint0 USINT +44 testsint0 SINT +46 testTime TIME +50 testByte BYTE +51 testUint UINT +53 testUdint UDINT +57 testLreal LREAL +65 testChar CHAR +66 testWchar WCHAR +68 testWstring WSTRING[4] +80 testDate DATE +82 testTod TOD +86 testDtl DTL +98 testFstring FSTRING[8] +""" + +_bytearray = bytearray( + [ + 0, + 0, # test int + 4, + 4, + ord("t"), + ord("e"), + ord("s"), + ord("t"), # test string + 0x0F, # test bools + 68, + 78, + 211, + 51, # test real + 255, + 255, + 255, + 255, # test dword + 0, + 0, # test int 2 + 128, + 0, + 0, + 0, # test dint + 255, + 255, # test word + 0, + 16, # test s5time + 32, + 7, + 18, + 23, + 50, + 2, + 133, + 65, # date_and_time (8 bytes) + 254, + 254, + 254, + 254, + 254, # padding + 127, # usint + 128, # sint + 143, + 255, + 255, + 255, # time + 254, # byte + 48, + 57, # uint + 7, + 91, + 205, + 21, # udint + 65, + 157, + 111, + 52, + 84, + 126, + 107, + 117, # lreal + 65, # char 'A' + 3, + 169, # wchar + 0, + 4, + 0, + 4, + 3, + 169, + 0, + ord("s"), + 0, + ord("t"), + 0, + 196, # wstring + 45, + 235, # date + 2, + 179, + 41, + 128, # tod + 7, + 230, + 3, + 9, + 4, + 12, + 34, + 45, + 0, + 0, + 0, + 0, # dtl + 116, + 101, + 115, + 116, + 32, + 32, + 32, + 32, # fstring 'test ' + ] +) + + +class TestPrintRow: + def test_print_row_output(self, caplog: pytest.LogCaptureFixture) -> None: + data = bytearray([65, 66, 67, 68, 69]) + with caplog.at_level(logging.INFO, logger="snap7.util.db"): + print_row(data) + assert "65" in caplog.text + assert "A" in caplog.text + + +class TestDBDictInterface: + def setup_method(self) -> None: + test_array = bytearray(_bytearray * 3) + self.db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=3, layout_offset=4, db_offset=0) + + def test_len(self) -> None: + assert len(self.db) == 3 + + def test_getitem(self) -> None: + row = self.db["0"] + assert row is not None + + def test_getitem_missing(self) -> None: + row = self.db["999"] + assert row is None + + def test_contains(self) -> None: + assert "0" in self.db + assert "999" not in self.db + + def test_keys(self) -> None: + keys = list(self.db.keys()) + assert "0" in keys + assert len(keys) == 3 + + def test_items(self) -> None: + items = list(self.db.items()) + assert len(items) == 3 + for key, row in items: + assert isinstance(key, str) + assert isinstance(row, Row) + + def test_iter(self) -> None: + for key, row in self.db: + assert isinstance(key, str) + assert isinstance(row, Row) + + def test_get_bytearray(self) -> None: + ba = self.db.get_bytearray() + assert isinstance(ba, bytearray) + + +class TestDBWithIdField: + def test_id_field_creates_named_index(self) -> None: + test_array = bytearray(_bytearray * 2) + # Set different ID values for each row + struct.pack_into(">h", test_array, 0, 10) # row 0, ID at offset 0 (spec offset 4, layout_offset 4) + struct.pack_into(">h", test_array, len(_bytearray), 20) # row 1 + db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=2, id_field="ID", layout_offset=4, db_offset=0) + assert "10" in db + assert "20" in db + + +class TestDBSetData: + def test_set_data_valid(self) -> None: + test_array = bytearray(_bytearray) + db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0) + new_data = bytearray(len(_bytearray)) + db.set_data(new_data) + assert db.get_bytearray() is new_data + + def test_set_data_invalid_type(self) -> None: + test_array = bytearray(_bytearray) + db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0) + with pytest.raises(TypeError): + db.set_data(b"not a bytearray") # type: ignore[arg-type] + + +class TestDBReadWrite: + """Test DB.read() and DB.write() with mocked client.""" + + def test_read_db_area(self) -> None: + test_array = bytearray(_bytearray) + db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0) + mock_client = MagicMock() + mock_client.db_read.return_value = bytearray(len(_bytearray)) + db.read(mock_client) + mock_client.db_read.assert_called_once() + + def test_read_non_db_area(self) -> None: + test_array = bytearray(_bytearray) + db = DB(0, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0, area=Area.MK) + mock_client = MagicMock() + mock_client.read_area.return_value = bytearray(len(_bytearray)) + db.read(mock_client) + mock_client.read_area.assert_called_once() + + def test_read_negative_row_size(self) -> None: + test_array = bytearray(_bytearray) + db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0) + db.row_size = -1 + mock_client = MagicMock() + with pytest.raises(ValueError, match="row_size"): + db.read(mock_client) + + def test_write_db_area(self) -> None: + test_array = bytearray(_bytearray) + db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0) + mock_client = MagicMock() + db.write(mock_client) + mock_client.db_write.assert_called_once() + + def test_write_non_db_area(self) -> None: + test_array = bytearray(_bytearray) + db = DB(0, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0, area=Area.MK) + mock_client = MagicMock() + db.write(mock_client) + mock_client.write_area.assert_called_once() + + def test_write_negative_row_size(self) -> None: + test_array = bytearray(_bytearray) + db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0) + db.row_size = -1 + mock_client = MagicMock() + with pytest.raises(ValueError, match="row_size"): + db.write(mock_client) + + def test_write_with_row_offset(self) -> None: + test_array = bytearray(_bytearray * 2) + db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=2, layout_offset=4, db_offset=0, row_offset=4) + mock_client = MagicMock() + db.write(mock_client) + # Should write each row individually via Row.write() + assert mock_client.db_write.call_count == 2 + + +class TestRowRepr: + def test_repr(self) -> None: + test_array = bytearray(_bytearray) + row = Row(test_array, test_spec, layout_offset=4) + r = repr(row) + assert "ID" in r + assert "NAME" in r + + +class TestRowUnchanged: + def test_unchanged_true(self) -> None: + test_array = bytearray(_bytearray) + row = Row(test_array, test_spec, layout_offset=4) + assert row.unchanged(test_array) is True + + def test_unchanged_false(self) -> None: + test_array = bytearray(_bytearray) + row = Row(test_array, test_spec, layout_offset=4) + other = bytearray(len(_bytearray)) + assert row.unchanged(other) is False + + +class TestRowTypeError: + def test_invalid_bytearray_type(self) -> None: + with pytest.raises(TypeError): + Row("not a bytearray", test_spec) # type: ignore[arg-type] + + +class TestRowReadWrite: + """Test Row.read() and Row.write() with mocked client through DB parent.""" + + def test_row_write_db_area(self) -> None: + test_array = bytearray(_bytearray) + db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0) + row = db["0"] + assert row is not None + mock_client = MagicMock() + row.write(mock_client) + mock_client.db_write.assert_called_once() + + def test_row_write_non_db_area(self) -> None: + test_array = bytearray(_bytearray) + db = DB(0, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0, area=Area.MK) + row = db["0"] + assert row is not None + mock_client = MagicMock() + row.write(mock_client) + mock_client.write_area.assert_called_once() + + def test_row_write_not_db_parent(self) -> None: + test_array = bytearray(_bytearray) + row = Row(test_array, test_spec, layout_offset=4) + mock_client = MagicMock() + with pytest.raises(TypeError): + row.write(mock_client) + + def test_row_write_negative_row_size(self) -> None: + test_array = bytearray(_bytearray) + db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0) + row = db["0"] + assert row is not None + row.row_size = -1 + mock_client = MagicMock() + with pytest.raises(ValueError, match="row_size"): + row.write(mock_client) + + def test_row_read_db_area(self) -> None: + test_array = bytearray(_bytearray) + db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0) + row = db["0"] + assert row is not None + mock_client = MagicMock() + mock_client.db_read.return_value = bytearray(len(_bytearray)) + row.read(mock_client) + mock_client.db_read.assert_called_once() + + def test_row_read_non_db_area(self) -> None: + test_array = bytearray(_bytearray) + db = DB(0, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0, area=Area.MK) + row = db["0"] + assert row is not None + mock_client = MagicMock() + mock_client.read_area.return_value = bytearray(len(_bytearray)) + row.read(mock_client) + mock_client.read_area.assert_called_once() + + def test_row_read_not_db_parent(self) -> None: + test_array = bytearray(_bytearray) + row = Row(test_array, test_spec, layout_offset=4) + mock_client = MagicMock() + with pytest.raises(TypeError): + row.read(mock_client) + + def test_row_read_negative_row_size(self) -> None: + test_array = bytearray(_bytearray) + db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0) + row = db["0"] + assert row is not None + row.row_size = -1 + mock_client = MagicMock() + with pytest.raises(ValueError, match="row_size"): + row.read(mock_client) + + +class TestRowSetValueTypes: + """Test set_value for various type branches.""" + + def setup_method(self) -> None: + self.test_array = bytearray(_bytearray) + self.row = Row(self.test_array, test_spec, layout_offset=4) + + def test_set_int(self) -> None: + self.row.set_value(4, "INT", 42) + assert self.row.get_value(4, "INT") == 42 + + def test_set_uint(self) -> None: + self.row.set_value(51, "UINT", 1000) + assert self.row.get_value(51, "UINT") == 1000 + + def test_set_dint(self) -> None: + self.row.set_value(23, "DINT", -100) + assert self.row.get_value(23, "DINT") == -100 + + def test_set_udint(self) -> None: + self.row.set_value(53, "UDINT", 999999) + assert self.row.get_value(53, "UDINT") == 999999 + + def test_set_word(self) -> None: + self.row.set_value(27, "WORD", 12345) + assert self.row.get_value(27, "WORD") == 12345 + + def test_set_usint(self) -> None: + self.row.set_value(43, "USINT", 200) + assert self.row.get_value(43, "USINT") == 200 + + def test_set_sint(self) -> None: + self.row.set_value(44, "SINT", -50) + assert self.row.get_value(44, "SINT") == -50 + + def test_set_time(self) -> None: + self.row.set_value(46, "TIME", "1:2:3:4.5") + assert self.row.get_value(46, "TIME") is not None + + def test_set_date(self) -> None: + d = datetime.date(2024, 1, 15) + self.row.set_value(80, "DATE", d) + assert self.row.get_value(80, "DATE") == d + + def test_set_tod(self) -> None: + td = datetime.timedelta(hours=5, minutes=30) + self.row.set_value(82, "TOD", td) + assert self.row.get_value(82, "TOD") == td + + def test_set_time_of_day(self) -> None: + td = datetime.timedelta(hours=1) + self.row.set_value(82, "TIME_OF_DAY", td) + assert self.row.get_value(82, "TIME_OF_DAY") == td + + def test_set_dtl(self) -> None: + dt = datetime.datetime(2024, 6, 15, 10, 20, 30) + self.row.set_value(86, "DTL", dt) + result = self.row.get_value(86, "DTL") + assert result.year == 2024 # type: ignore[union-attr] + + def test_set_date_and_time(self) -> None: + dt = datetime.datetime(2020, 7, 12, 17, 32, 2, 854000) + self.row.set_value(31, "DATE_AND_TIME", dt) + result = self.row.get_value(31, "DATE_AND_TIME") + assert "2020" in str(result) + + def test_set_unknown_type_raises(self) -> None: + with pytest.raises(ValueError): + self.row.set_value(4, "UNKNOWN_TYPE", 42) + + def test_set_string(self) -> None: + self.row.set_value(6, "STRING[4]", "ab") + assert self.row.get_value(6, "STRING[4]") == "ab" + + def test_set_wstring(self) -> None: + self.row.set_value(68, "WSTRING[4]", "ab") + assert self.row.get_value(68, "WSTRING[4]") == "ab" + + def test_set_fstring(self) -> None: + self.row.set_value(98, "FSTRING[8]", "hi") + assert self.row.get_value(98, "FSTRING[8]") == "hi" + + def test_set_real(self) -> None: + self.row.set_value(13, "REAL", 3.14) + assert abs(self.row.get_value(13, "REAL") - 3.14) < 0.01 # type: ignore[operator] + + def test_set_lreal(self) -> None: + self.row.set_value(57, "LREAL", 2.718281828) + assert abs(self.row.get_value(57, "LREAL") - 2.718281828) < 0.0001 # type: ignore[operator] + + def test_set_char(self) -> None: + self.row.set_value(65, "CHAR", "Z") + assert self.row.get_value(65, "CHAR") == "Z" + + def test_set_wchar(self) -> None: + self.row.set_value(66, "WCHAR", "W") + assert self.row.get_value(66, "WCHAR") == "W" + + +class TestRowGetValueEdgeCases: + """Test get_value for edge cases.""" + + def setup_method(self) -> None: + self.test_array = bytearray(_bytearray) + self.row = Row(self.test_array, test_spec, layout_offset=4) + + def test_unknown_type_raises(self) -> None: + with pytest.raises(ValueError): + self.row.get_value(4, "NONEXISTENT") + + def test_string_no_max_size(self) -> None: + spec = "4 test STRING" + row = Row(bytearray(20), spec, layout_offset=0) + with pytest.raises(ValueError, match="Max size"): + row.get_value(4, "STRING") + + def test_fstring_no_max_size(self) -> None: + with pytest.raises(ValueError, match="Max size"): + self.row.get_value(98, "FSTRING") + + def test_wstring_no_max_size(self) -> None: + with pytest.raises(ValueError, match="Max size"): + self.row.get_value(68, "WSTRING") + + +class TestRowSetValueEdgeCases: + """Test set_value edge cases for string types.""" + + def setup_method(self) -> None: + self.test_array = bytearray(_bytearray) + self.row = Row(self.test_array, test_spec, layout_offset=4) + + def test_fstring_no_max_size(self) -> None: + with pytest.raises(ValueError, match="Max size"): + self.row.set_value(98, "FSTRING", "test") + + def test_string_no_max_size(self) -> None: + with pytest.raises(ValueError, match="Max size"): + self.row.set_value(6, "STRING", "test") + + def test_wstring_no_max_size(self) -> None: + with pytest.raises(ValueError, match="Max size"): + self.row.set_value(68, "WSTRING", "test") + + +class TestRowWriteWithRowOffset: + """Test Row.write() with row_offset set.""" + + def test_write_with_row_offset(self) -> None: + test_array = bytearray(_bytearray) + db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0, row_offset=10) + row = db["0"] + assert row is not None + mock_client = MagicMock() + row.write(mock_client) + # The data written should start at db_offset + row_offset + mock_client.db_write.assert_called_once() diff --git a/tests/test_error.py b/tests/test_error.py new file mode 100644 index 00000000..7e32f9e4 --- /dev/null +++ b/tests/test_error.py @@ -0,0 +1,181 @@ +"""Tests for snap7.error module — error routing, check_error(), error_wrap() decorator.""" + +import pytest + +from snap7.error import ( + S7Error, + S7ConnectionError, + S7ProtocolError, + S7TimeoutError, + S7AuthenticationError, + S7StalePacketError, + S7PacketLostError, + get_error_message, + get_protocol_error_message, + check_error, + error_text, + error_wrap, +) + + +class TestExceptionClasses: + """Verify all exception classes can be instantiated with expected attributes.""" + + def test_s7error_with_code(self) -> None: + err = S7Error("msg", error_code=42) + assert str(err) == "msg" + assert err.error_code == 42 + + def test_s7error_without_code(self) -> None: + err = S7Error("msg") + assert err.error_code is None + + def test_subclass_hierarchy(self) -> None: + assert issubclass(S7ConnectionError, S7Error) + assert issubclass(S7ProtocolError, S7Error) + assert issubclass(S7TimeoutError, S7Error) + assert issubclass(S7AuthenticationError, S7Error) + assert issubclass(S7StalePacketError, S7ProtocolError) + assert issubclass(S7PacketLostError, S7ProtocolError) + + def test_all_subclasses_instantiate(self) -> None: + for cls in ( + S7ConnectionError, + S7ProtocolError, + S7TimeoutError, + S7AuthenticationError, + S7StalePacketError, + S7PacketLostError, + ): + e = cls("test", error_code=1) + assert str(e) == "test" + assert e.error_code == 1 + + +class TestGetErrorMessage: + """Tests for get_error_message() — known and unknown codes.""" + + def test_success_code(self) -> None: + assert get_error_message(0x00000000) == "Success" + + def test_known_client_error(self) -> None: + # Use a code unique to client errors (not overlapping with server: 0x009+) + assert get_error_message(0x00900000) == "errCliAddressOutOfRange" + + def test_known_isotcp_error(self) -> None: + assert get_error_message(0x00010000) == "errIsoConnect" + + def test_known_server_error(self) -> None: + assert get_error_message(0x00200000) == "errSrvDBNullPointer" + + def test_unknown_code(self) -> None: + msg = get_error_message(0xDEADBEEF) + assert "Unknown error" in msg + assert "0xdeadbeef" in msg + + +class TestGetProtocolErrorMessage: + """Tests for get_protocol_error_message() — known and unknown protocol codes.""" + + def test_known_protocol_code(self) -> None: + assert get_protocol_error_message(0x0000) == "No error" + + def test_known_protocol_error(self) -> None: + assert "block number" in get_protocol_error_message(0x0110).lower() + + def test_unknown_protocol_code(self) -> None: + msg = get_protocol_error_message(0xFFFF) + assert "Unknown protocol error" in msg + + +class TestErrorText: + """Tests for error_text() with different contexts.""" + + def test_client_context(self) -> None: + msg = error_text(0x00100000, "client") + assert msg == "errNegotiatingPDU" + + def test_server_context(self) -> None: + # Server dict has its own 0x00100000 entry + msg = error_text(0x00100000, "server") + assert msg == "errSrvCannotStart" + + def test_partner_context(self) -> None: + # Partner uses client errors + msg = error_text(0x00100000, "partner") + assert msg == "errNegotiatingPDU" + + def test_unknown_context_falls_back_to_client(self) -> None: + msg = error_text(0x00100000, "unknown_context") + assert msg == "errNegotiatingPDU" + + def test_unknown_error_code(self) -> None: + msg = error_text(0xBADC0DE, "client") + assert "Unknown error" in msg + + def test_caching(self) -> None: + # Calling twice should return the same cached result + a = error_text(0x00100000, "client") + b = error_text(0x00100000, "client") + assert a == b + + +class TestCheckError: + """Tests for check_error() — routes error codes to exception types.""" + + def test_zero_returns_none(self) -> None: + # Should not raise + check_error(0) + + def test_iso_connect_raises_connection_error(self) -> None: + with pytest.raises(S7ConnectionError): + check_error(0x00010000) + + def test_iso_disconnect_raises_connection_error(self) -> None: + with pytest.raises(S7ConnectionError): + check_error(0x00020000) + + def test_timeout_raises_timeout_error(self) -> None: + with pytest.raises(S7TimeoutError): + check_error(0x02000000) + + def test_other_isotcp_raises_connection_error(self) -> None: + with pytest.raises(S7ConnectionError): + check_error(0x00030000) # errIsoInvalidPDU + + def test_generic_error_raises_runtime_error(self) -> None: + with pytest.raises(RuntimeError): + check_error(0x00100000) # errNegotiatingPDU (client error) + + +class TestErrorWrap: + """Tests for error_wrap() decorator.""" + + def test_no_error(self) -> None: + @error_wrap("client") + def ok_func() -> int: + return 0 + + # Should not raise, returns None (decorator suppresses return value) + result = ok_func() + assert result is None + + def test_raises_on_error(self) -> None: + @error_wrap("client") + def bad_func() -> int: + return 0x02000000 # timeout + + with pytest.raises(S7TimeoutError): + bad_func() + + def test_passes_args_through(self) -> None: + @error_wrap("client") + def func_with_args(a: int, b: int) -> int: + return a + b + + # 0 + 0 = 0, no error + func_with_args(0, 0) + + with pytest.raises(RuntimeError): + # Non-zero = error + func_with_args(0x00100000, 0) diff --git a/tests/test_s7protocol_coverage.py b/tests/test_s7protocol_coverage.py new file mode 100644 index 00000000..264c15bd --- /dev/null +++ b/tests/test_s7protocol_coverage.py @@ -0,0 +1,535 @@ +"""Tests for snap7.s7protocol — response parsers with crafted PDUs, error paths.""" + +import struct +import pytest +from datetime import datetime + +from snap7.s7protocol import ( + S7Protocol, + S7PDUType, + S7Function, + S7UserDataGroup, + S7UserDataSubfunction, + get_return_code_description, +) +from snap7.error import S7ProtocolError + + +class TestGetReturnCodeDescription: + def test_known_code(self) -> None: + assert get_return_code_description(0xFF) == "Success" + + def test_unknown_code(self) -> None: + assert get_return_code_description(0xAB) == "Unknown error" + + +class TestParseResponse: + """Test parse_response() with crafted PDUs.""" + + def setup_method(self) -> None: + self.proto = S7Protocol() + + def _build_ack_data_pdu( + self, + func_code: int, + item_count: int = 1, + data_section: bytes = b"", + error_class: int = 0, + error_code: int = 0, + sequence: int = 1, + ) -> bytes: + """Build a minimal ACK_DATA PDU.""" + params = struct.pack(">BB", func_code, item_count) + header = struct.pack( + ">BBHHHHBB", + 0x32, + S7PDUType.ACK_DATA, + 0x0000, + sequence, + len(params), + len(data_section), + error_class, + error_code, + ) + return header + params + data_section + + def test_pdu_too_short(self) -> None: + with pytest.raises(S7ProtocolError, match="too short"): + self.proto.parse_response(b"\x32\x03\x00") + + def test_invalid_protocol_id(self) -> None: + # Build a valid-length PDU with wrong protocol ID + pdu = struct.pack(">BBHHHHBB", 0x99, S7PDUType.ACK_DATA, 0, 1, 0, 0, 0, 0) + with pytest.raises(S7ProtocolError, match="Invalid protocol ID"): + self.proto.parse_response(pdu) + + def test_unexpected_pdu_type(self) -> None: + # REQUEST type (0x01) is not a valid response + pdu = struct.pack(">BBHHHHBB", 0x32, S7PDUType.REQUEST, 0, 1, 0, 0, 0, 0) + with pytest.raises(S7ProtocolError, match="Expected response PDU"): + self.proto.parse_response(pdu) + + def test_header_error(self) -> None: + pdu = struct.pack(">BBHHHHBB", 0x32, S7PDUType.ACK_DATA, 0, 1, 0, 0, 0x05, 0x04) + with pytest.raises(S7ProtocolError, match="S7 protocol error"): + self.proto.parse_response(pdu) + + def test_ack_no_data(self) -> None: + """ACK (type 0x02) PDU with no params or data — write response.""" + pdu = struct.pack(">BBHHHHBB", 0x32, S7PDUType.ACK, 0, 1, 0, 0, 0, 0) + resp = self.proto.parse_response(pdu) + assert resp["sequence"] == 1 + assert resp["parameters"] is None + assert resp["data"] is None + + def test_read_response(self) -> None: + """ACK_DATA with read parameters and data.""" + data_section = struct.pack(">BBH", 0xFF, 0x04, 16) + b"\xab\xcd" # 16 bits = 2 bytes + pdu = self._build_ack_data_pdu(S7Function.READ_AREA, 1, data_section) + resp = self.proto.parse_response(pdu) + assert resp["parameters"]["function_code"] == S7Function.READ_AREA + assert resp["data"]["data"] == b"\xab\xcd" + + def test_write_response_single_byte_data(self) -> None: + """Write response with single-byte data section (return code only).""" + data_section = b"\xff" # success + pdu = self._build_ack_data_pdu(S7Function.WRITE_AREA, 1, data_section) + resp = self.proto.parse_response(pdu) + assert resp["data"]["return_code"] == 0xFF + + def test_setup_comm_response(self) -> None: + params = struct.pack(">BBHHH", S7Function.SETUP_COMMUNICATION, 0x00, 1, 1, 480) + header = struct.pack(">BBHHHHBB", 0x32, S7PDUType.ACK_DATA, 0, 1, len(params), 0, 0, 0) + pdu = header + params + resp = self.proto.parse_response(pdu) + assert resp["parameters"]["pdu_length"] == 480 + + def test_param_section_extends_beyond_pdu(self) -> None: + # param_len = 100 but PDU is too short + header = struct.pack(">BBHHHHBB", 0x32, S7PDUType.ACK_DATA, 0, 1, 100, 0, 0, 0) + with pytest.raises(S7ProtocolError, match="Parameter section extends beyond PDU"): + self.proto.parse_response(header) + + def test_data_section_extends_beyond_pdu(self) -> None: + # data_len = 100 but no data follows + params = struct.pack(">BB", S7Function.READ_AREA, 1) + header = struct.pack(">BBHHHHBB", 0x32, S7PDUType.ACK_DATA, 0, 1, len(params), 100, 0, 0) + pdu = header + params + with pytest.raises(S7ProtocolError, match="Data section extends beyond PDU"): + self.proto.parse_response(pdu) + + def test_unknown_function_code(self) -> None: + pdu = self._build_ack_data_pdu(0xAA, 0) + resp = self.proto.parse_response(pdu) + assert resp["parameters"]["function_code"] == 0xAA + + +class TestUserDataParsing: + """Test USERDATA PDU parsing.""" + + def setup_method(self) -> None: + self.proto = S7Protocol() + + def _build_userdata_response( + self, + group: int = S7UserDataGroup.SZL, + subfunction: int = S7UserDataSubfunction.READ_SZL, + sequence_number: int = 0, + last_data_unit: int = 0x00, + error_code: int = 0, + data_payload: bytes = b"", + ) -> bytes: + """Build a USERDATA response PDU.""" + # Parameter section (12 bytes for response) + type_group = 0x80 | (group & 0x0F) # response type + param_data = struct.pack( + ">BBBBBBBBBBH", + 0x00, # Reserved + 0x01, # Parameter count + 0x12, # Type header + 0x08, # Length (response = 8) + 0x12, # Method (response) + type_group, + subfunction, + sequence_number, + 0x00, # Data unit reference + last_data_unit, + error_code, + ) + + # Data section + data_section = ( + struct.pack( + ">BBH", + 0xFF, # Return code (success) + 0x09, # Transport size (octet string) + len(data_payload), + ) + + data_payload + ) + + header = struct.pack( + ">BBHHHH", + 0x32, + S7PDUType.USERDATA, + 0x0000, + 1, + len(param_data), + len(data_section), + ) + + return header + param_data + data_section + + def test_userdata_too_short(self) -> None: + pdu = struct.pack(">BBHH", 0x32, S7PDUType.USERDATA, 0, 1) + with pytest.raises(S7ProtocolError, match="too short"): + self.proto.parse_response(pdu) + + def test_userdata_response(self) -> None: + pdu = self._build_userdata_response(data_payload=b"\x01\x02\x03\x04") + resp = self.proto.parse_response(pdu) + assert resp["parameters"]["group"] == S7UserDataGroup.SZL + assert resp["data"]["data"] == b"\x01\x02\x03\x04" + + def test_userdata_with_error(self) -> None: + pdu = self._build_userdata_response(error_code=0x8104) + resp = self.proto.parse_response(pdu) + assert resp["parameters"]["error_code"] == 0x8104 + + def test_userdata_more_data_available(self) -> None: + pdu = self._build_userdata_response(last_data_unit=0x01, sequence_number=0x05) + resp = self.proto.parse_response(pdu) + assert resp["parameters"]["last_data_unit"] == 0x01 + assert resp["parameters"]["sequence_number"] == 0x05 + + +class TestParseStartUploadResponse: + def setup_method(self) -> None: + self.proto = S7Protocol() + + def test_valid_response(self) -> None: + # Layout: func(1) + status(1) + reserved(1) + reserved(1) + upload_id(4) = 8 bytes + # Parser reads upload_id from raw_params[4:8] + raw_params = struct.pack(">BBBBI", S7Function.START_UPLOAD, 0x00, 0x00, 0x00, 0x12345678) + # Add block length: len_field(1) + length_str + # Condition: len(raw_params) > 9 + len_field, so we need total > 9 + len(length_str) + length_str = b"000100" + raw_params += struct.pack(">B", len(length_str)) + length_str + b"\x00" # extra byte to satisfy > + response = {"raw_parameters": raw_params} + result = self.proto.parse_start_upload_response(response) + assert result["upload_id"] == 0x12345678 + assert result["block_length"] == 100 + + def test_short_response(self) -> None: + response = {"raw_parameters": b"\x00\x00\x00"} + result = self.proto.parse_start_upload_response(response) + assert result["upload_id"] == 0 + assert result["block_length"] == 0 + + def test_no_raw_parameters(self) -> None: + response = {} + result = self.proto.parse_start_upload_response(response) + assert result["upload_id"] == 0 + + def test_invalid_length_string(self) -> None: + raw_params = struct.pack(">BBBI", 0x1D, 0, 0, 1) + raw_params += struct.pack(">B", 3) + b"abc" + response = {"raw_parameters": raw_params} + result = self.proto.parse_start_upload_response(response) + assert result["block_length"] == 0 # ValueError caught + + +class TestParseUploadResponse: + def setup_method(self) -> None: + self.proto = S7Protocol() + + def test_valid_response(self) -> None: + response = {"data": {"data": b"\x01\x02\x03\x04\x05"}} + result = self.proto.parse_upload_response(response) + assert result == b"\x01\x02\x03\x04\x05" + + def test_short_data(self) -> None: + response = {"data": {"data": b"\x01\x02"}} + result = self.proto.parse_upload_response(response) + assert result == b"" + + def test_empty_response(self) -> None: + response = {"data": {"data": b""}} + result = self.proto.parse_upload_response(response) + assert result == b"" + + def test_no_data_key(self) -> None: + response = {} + result = self.proto.parse_upload_response(response) + assert result == b"" + + +class TestParseListBlocksResponse: + def setup_method(self) -> None: + self.proto = S7Protocol() + + def test_valid_response(self) -> None: + # Build entries: indicator(0x30) + type + count(2 bytes) + data = b"" + data += struct.pack(">BBH", 0x30, 0x38, 5) # OB: 5 + data += struct.pack(">BBH", 0x30, 0x41, 3) # DB: 3 + data += struct.pack(">BBH", 0x30, 0x43, 7) # FC: 7 + response = {"data": {"data": data}} + result = self.proto.parse_list_blocks_response(response) + assert result["OBCount"] == 5 + assert result["DBCount"] == 3 + assert result["FCCount"] == 7 + assert result["FBCount"] == 0 + + def test_empty_data(self) -> None: + response = {"data": {"data": b""}} + result = self.proto.parse_list_blocks_response(response) + assert result["DBCount"] == 0 + + def test_no_data(self) -> None: + response = {} + result = self.proto.parse_list_blocks_response(response) + assert all(v == 0 for v in result.values()) + + def test_unknown_block_type_ignored(self) -> None: + data = struct.pack(">BBH", 0x30, 0xFF, 99) # unknown type + response = {"data": {"data": data}} + result = self.proto.parse_list_blocks_response(response) + assert all(v == 0 for v in result.values()) + + +class TestParseListBlocksOfTypeResponse: + def setup_method(self) -> None: + self.proto = S7Protocol() + + def test_valid_response(self) -> None: + # Each entry: block_num(2) + unknown(1) + lang(1) + data = struct.pack(">HBB", 1, 0, 0) + struct.pack(">HBB", 5, 0, 0) + struct.pack(">HBB", 100, 0, 0) + response = {"data": {"data": data}} + result = self.proto.parse_list_blocks_of_type_response(response) + assert result == [1, 5, 100] + + def test_empty_data(self) -> None: + response = {"data": {"data": b""}} + result = self.proto.parse_list_blocks_of_type_response(response) + assert result == [] + + def test_no_data(self) -> None: + response = {} + result = self.proto.parse_list_blocks_of_type_response(response) + assert result == [] + + +class TestParseGetBlockInfoResponse: + def setup_method(self) -> None: + self.proto = S7Protocol() + + def test_short_data(self) -> None: + response = {"data": {"data": b"\x00" * 10}} + result = self.proto.parse_get_block_info_response(response) + assert result["block_type"] == 0 + assert result["mc7_size"] == 0 + + def test_valid_data(self) -> None: + raw_data = bytearray(80) + raw_data[1] = 0x41 # block_type = DB + raw_data[9] = 0x01 # flags + raw_data[10] = 0x05 # lang + struct.pack_into(">H", raw_data, 12, 42) # block_number + struct.pack_into(">I", raw_data, 14, 1024) # load_size + struct.pack_into(">H", raw_data, 34, 100) # sbb_length + struct.pack_into(">H", raw_data, 38, 50) # local_data + struct.pack_into(">H", raw_data, 40, 200) # mc7_size + raw_data[66] = 0x03 # version + struct.pack_into(">H", raw_data, 68, 0xABCD) # checksum + + response = {"data": {"data": bytes(raw_data)}} + result = self.proto.parse_get_block_info_response(response) + assert result["block_type"] == 0x41 + assert result["block_number"] == 42 + assert result["mc7_size"] == 200 + assert result["load_size"] == 1024 + assert result["checksum"] == 0xABCD + assert result["version"] == 0x03 + + def test_no_data(self) -> None: + response = {} + result = self.proto.parse_get_block_info_response(response) + assert result["block_type"] == 0 + + +class TestParseReadSZLResponse: + def setup_method(self) -> None: + self.proto = S7Protocol() + + def test_first_fragment(self) -> None: + raw_data = struct.pack(">HH", 0x0011, 0x0000) + b"\x01\x02\x03" + response = {"data": {"data": raw_data}} + result = self.proto.parse_read_szl_response(response, first_fragment=True) + assert result["szl_id"] == 0x0011 + assert result["szl_index"] == 0x0000 + assert result["data"] == b"\x01\x02\x03" + + def test_first_fragment_short_data(self) -> None: + response = {"data": {"data": b"\x00\x01"}} + result = self.proto.parse_read_szl_response(response, first_fragment=True) + assert result["szl_id"] == 0 + assert result["data"] == b"" + + def test_followup_fragment(self) -> None: + response = {"data": {"data": b"\xaa\xbb\xcc"}} + result = self.proto.parse_read_szl_response(response, first_fragment=False) + assert result["data"] == b"\xaa\xbb\xcc" + assert result["szl_id"] == 0 + + def test_empty_data(self) -> None: + response = {} + result = self.proto.parse_read_szl_response(response) + assert result["data"] == b"" + + +class TestParseGetClockResponse: + def setup_method(self) -> None: + self.proto = S7Protocol() + + def test_valid_bcd_time(self) -> None: + # BCD: reserved, year=24, month=03, day=15, hour=10, minute=30, second=45, dow=6(Saturday) + raw_data = struct.pack(">BBBBBBBB", 0x00, 0x24, 0x03, 0x15, 0x10, 0x30, 0x45, 0x06) + response = {"data": {"data": raw_data}} + result = self.proto.parse_get_clock_response(response) + assert result.year == 2024 + assert result.month == 3 + assert result.day == 15 + assert result.hour == 10 + assert result.minute == 30 + assert result.second == 45 + + def test_year_90_is_1990(self) -> None: + raw_data = struct.pack(">BBBBBBBB", 0x00, 0x90, 0x01, 0x01, 0x00, 0x00, 0x00, 0x01) + response = {"data": {"data": raw_data}} + result = self.proto.parse_get_clock_response(response) + assert result.year == 1990 + + def test_short_data_returns_now(self) -> None: + response = {"data": {"data": b"\x00\x01"}} + result = self.proto.parse_get_clock_response(response) + # Should return roughly "now" + assert isinstance(result, datetime) + + def test_invalid_bcd_date_returns_now(self) -> None: + # Month=99 is invalid + raw_data = struct.pack(">BBBBBBBB", 0x00, 0x24, 0x99, 0x15, 0x10, 0x30, 0x45, 0x06) + response = {"data": {"data": raw_data}} + result = self.proto.parse_get_clock_response(response) + # Should fallback to now + assert isinstance(result, datetime) + + +class TestParseParameterEdgeCases: + def setup_method(self) -> None: + self.proto = S7Protocol() + + def test_empty_parameters(self) -> None: + result = self.proto._parse_parameters(b"") + assert result == {} + + def test_read_response_params_too_short(self) -> None: + with pytest.raises(S7ProtocolError, match="too short"): + self.proto._parse_read_response_params(b"\x04") + + def test_write_response_params_too_short(self) -> None: + with pytest.raises(S7ProtocolError, match="too short"): + self.proto._parse_write_response_params(b"\x05") + + def test_setup_comm_params_too_short(self) -> None: + with pytest.raises(S7ProtocolError, match="too short"): + self.proto._parse_setup_comm_response_params(b"\xf0\x00\x00") + + +class TestParseDataSection: + def setup_method(self) -> None: + self.proto = S7Protocol() + + def test_single_byte(self) -> None: + result = self.proto._parse_data_section(b"\xff") + assert result["return_code"] == 0xFF + + def test_two_three_bytes_raw(self) -> None: + result = self.proto._parse_data_section(b"\xaa\xbb") + assert result["raw_data"] == b"\xaa\xbb" + + def test_octet_string_transport(self) -> None: + # Transport size 0x09 = octet string (byte length) + data = struct.pack(">BBH", 0xFF, 0x09, 3) + b"\x01\x02\x03" + result = self.proto._parse_data_section(data) + assert result["data"] == b"\x01\x02\x03" + + def test_byte_transport_bit_length(self) -> None: + # Transport size 0x04 = byte (bit length) + data = struct.pack(">BBH", 0xFF, 0x04, 24) + b"\x01\x02\x03" # 24 bits = 3 bytes + result = self.proto._parse_data_section(data) + assert result["data"] == b"\x01\x02\x03" + + +class TestExtractReadData: + def setup_method(self) -> None: + self.proto = S7Protocol() + + def test_no_data_in_response(self) -> None: + with pytest.raises(S7ProtocolError, match="No data"): + self.proto.extract_read_data({}, None, 0) # type: ignore[arg-type] + + def test_non_success_return_code(self) -> None: + response = {"data": {"return_code": 0x05, "data": b""}} + with pytest.raises(S7ProtocolError, match="Read operation failed"): + self.proto.extract_read_data(response, None, 0) # type: ignore[arg-type] + + def test_success(self) -> None: + from snap7.datatypes import S7WordLen + + response = {"data": {"return_code": 0xFF, "data": b"\x01\x02\x03"}} + result = self.proto.extract_read_data(response, S7WordLen.BYTE, 3) + assert result == [1, 2, 3] + + +class TestCheckWriteResponse: + def setup_method(self) -> None: + self.proto = S7Protocol() + + def test_header_error(self) -> None: + with pytest.raises(S7ProtocolError, match="Write operation failed"): + self.proto.check_write_response({"error_code": 0x8104}) + + def test_data_section_error(self) -> None: + with pytest.raises(S7ProtocolError, match="Write operation failed"): + self.proto.check_write_response({"error_code": 0, "data": {"return_code": 0x05}}) + + def test_success_with_data(self) -> None: + # Should not raise + self.proto.check_write_response({"error_code": 0, "data": {"return_code": 0xFF}}) + + def test_success_without_data(self) -> None: + # ACK without data section — should not raise + self.proto.check_write_response({"error_code": 0}) + + +class TestValidatePDUReference: + def setup_method(self) -> None: + self.proto = S7Protocol() + self.proto.sequence = 5 + + def test_matching(self) -> None: + # Should not raise + self.proto.validate_pdu_reference(5) + + def test_stale(self) -> None: + from snap7.error import S7StalePacketError + + with pytest.raises(S7StalePacketError): + self.proto.validate_pdu_reference(3) + + def test_lost(self) -> None: + from snap7.error import S7PacketLostError + + with pytest.raises(S7PacketLostError): + self.proto.validate_pdu_reference(7) diff --git a/tests/test_server_cli.py b/tests/test_server_cli.py new file mode 100644 index 00000000..b0e4372d --- /dev/null +++ b/tests/test_server_cli.py @@ -0,0 +1,30 @@ +"""Tests for snap7.server.__main__ — CLI entrypoint.""" + +import pytest + +click = pytest.importorskip("click") +from click.testing import CliRunner # noqa: E402 +from snap7.server.__main__ import main # noqa: E402 + + +class TestServerCLI: + """Test the Click CLI entrypoint.""" + + def test_help(self) -> None: + runner = CliRunner() + result = runner.invoke(main, ["--help"]) + assert result.exit_code == 0 + assert "Start a S7 dummy server" in result.output + + def test_help_short(self) -> None: + runner = CliRunner() + result = runner.invoke(main, ["-h"]) + assert result.exit_code == 0 + assert "--port" in result.output + + def test_version(self) -> None: + runner = CliRunner() + result = runner.invoke(main, ["--version"]) + assert result.exit_code == 0 + # Should print version string + assert "version" in result.output.lower() or "." in result.output From fe6df939d385d7fbb4beca5aeea29db6b62c795f Mon Sep 17 00:00:00 2001 From: Gijs Molenaar Date: Fri, 20 Mar 2026 12:35:41 +0200 Subject: [PATCH 11/19] Add native AsyncClient with asyncio support (#593) * Revert "Revert async client commits from master" This reverts commit 746a9b2c94e6d15963ba5e137520e6713423b6f4. * Fix pre-commit issues: unused imports, hex casing, mypy types Co-Authored-By: Claude Opus 4.6 * Fix CI: add pytest-asyncio dep, ruff formatting, async docs - Add pytest-asyncio to test dependencies in pyproject.toml - Apply ruff format to async_client.py (struct.pack arg formatting) - Add AsyncClient documentation (doc/API/async_client.rst) - Add async_client to Sphinx toctree - Add async example to README.rst Co-Authored-By: Claude Opus 4.6 * Fix AsyncClient.get_connected to also check connection.connected Address PR review comment: verify the underlying Connection object reports as connected, not just the client-level flag. Co-Authored-By: Claude Opus 4.6 --------- Co-authored-by: Claude Opus 4.6 --- README.rst | 17 + doc/API/async_client.rst | 43 ++ doc/index.rst | 1 + pyproject.toml | 2 +- snap7/__init__.py | 2 + snap7/async_client.py | 1275 ++++++++++++++++++++++++++++++++++++ snap7/client.py | 215 +----- snap7/client_base.py | 252 +++++++ tests/test_async_client.py | 329 ++++++++++ uv.lock | 25 + 10 files changed, 1948 insertions(+), 213 deletions(-) create mode 100644 doc/API/async_client.rst create mode 100644 snap7/async_client.py create mode 100644 snap7/client_base.py create mode 100644 tests/test_async_client.py diff --git a/README.rst b/README.rst index f748fb5f..2b7cf5a3 100644 --- a/README.rst +++ b/README.rst @@ -68,3 +68,20 @@ Install using pip:: $ pip install python-snap7 No native libraries or platform-specific dependencies are required — python-snap7 is a pure Python package that works on all platforms. + + +Async support +============= + +An ``AsyncClient`` is available for use with ``asyncio``:: + + import asyncio + import snap7 + + async def main(): + async with snap7.AsyncClient() as client: + await client.connect("192.168.1.10", 0, 1) + data = await client.db_read(1, 0, 4) + print(data) + + asyncio.run(main()) diff --git a/doc/API/async_client.rst b/doc/API/async_client.rst new file mode 100644 index 00000000..34e70b8a --- /dev/null +++ b/doc/API/async_client.rst @@ -0,0 +1,43 @@ +AsyncClient +=========== + +The :class:`~snap7.async_client.AsyncClient` provides a native ``asyncio`` +interface for communicating with Siemens S7 PLCs. It has feature parity with +the synchronous :class:`~snap7.client.Client` and is safe for concurrent use +via ``asyncio.gather()``. + +Quick start +----------- + +.. code-block:: python + + import asyncio + import snap7 + + async def main(): + async with snap7.AsyncClient() as client: + await client.connect("192.168.1.10", 0, 1) + data = await client.db_read(1, 0, 4) + print(data) + + asyncio.run(main()) + +Concurrent reads +---------------- + +An internal ``asyncio.Lock`` serialises each send/receive cycle so that +multiple coroutines can safely share a single connection: + +.. code-block:: python + + results = await asyncio.gather( + client.db_read(1, 0, 4), + client.db_read(1, 10, 4), + ) + +API reference +------------- + +.. automodule:: snap7.async_client + :members: + :exclude-members: AsyncISOTCPConnection diff --git a/doc/index.rst b/doc/index.rst index fd34584b..e42a66d5 100644 --- a/doc/index.rst +++ b/doc/index.rst @@ -11,6 +11,7 @@ Contents: development API/client + API/async_client API/server API/partner API/logo diff --git a/pyproject.toml b/pyproject.toml index 3deb7fa9..f040cc8d 100644 --- a/pyproject.toml +++ b/pyproject.toml @@ -32,7 +32,7 @@ Homepage = "https://github.com/gijzelaerr/python-snap7" Documentation = "https://python-snap7.readthedocs.io/en/latest/" [project.optional-dependencies] -test = ["pytest", "pytest-cov", "pytest-html", "mypy", "types-setuptools", "ruff", "tox", "tox-uv", "types-click", "uv"] +test = ["pytest", "pytest-asyncio", "pytest-cov", "pytest-html", "mypy", "types-setuptools", "ruff", "tox", "tox-uv", "types-click", "uv"] cli = ["rich", "click" ] doc = ["sphinx", "sphinx_rtd_theme"] diff --git a/snap7/__init__.py b/snap7/__init__.py index 1b9756d3..ba87536d 100644 --- a/snap7/__init__.py +++ b/snap7/__init__.py @@ -8,6 +8,7 @@ from importlib.metadata import version, PackageNotFoundError from .client import Client +from .async_client import AsyncClient from .server import Server from .partner import Partner from .logo import Logo @@ -16,6 +17,7 @@ __all__ = [ "Client", + "AsyncClient", "Server", "Partner", "Logo", diff --git a/snap7/async_client.py b/snap7/async_client.py new file mode 100644 index 00000000..dd767031 --- /dev/null +++ b/snap7/async_client.py @@ -0,0 +1,1275 @@ +""" +Native async S7 client implementation. + +Uses asyncio streams for non-blocking I/O with an asyncio.Lock() to serialize +send/receive cycles, ensuring safe concurrent use via asyncio.gather(). +""" + +import asyncio +import logging +import struct +import time +from typing import List, Any, Optional, Tuple, Type +from types import TracebackType +from datetime import datetime + +from .connection import TPDUSize +from .s7protocol import S7Protocol, get_return_code_description +from .datatypes import S7WordLen +from .error import S7Error, S7ConnectionError, S7ProtocolError, S7TimeoutError +from .client_base import ClientMixin +from .type import ( + Area, + Block, + BlocksList, + S7CpuInfo, + TS7BlockInfo, + S7CpInfo, + S7OrderCode, + S7Protection, + S7SZL, + Parameter, +) + + +logger = logging.getLogger(__name__) + + +class AsyncISOTCPConnection: + """Async ISO on TCP connection using asyncio streams. + + Mirrors ISOTCPConnection but uses asyncio.open_connection() instead of + blocking sockets for non-blocking I/O. + """ + + # COTP PDU types + COTP_CR = 0xE0 # Connection Request + COTP_CC = 0xD0 # Connection Confirm + COTP_DR = 0x80 # Disconnect Request + COTP_DT = 0xF0 # Data Transfer + + # COTP parameter codes (ISO 8073) + COTP_PARAM_PDU_SIZE = 0xC0 + COTP_PARAM_CALLING_TSAP = 0xC1 + COTP_PARAM_CALLED_TSAP = 0xC2 + + def __init__( + self, + host: str, + port: int = 102, + local_tsap: int = 0x0100, + remote_tsap: int = 0x0102, + tpdu_size: TPDUSize = TPDUSize.S_1024, + ): + self.host = host + self.port = port + self.local_tsap = local_tsap + self.remote_tsap = remote_tsap + self.tpdu_size = tpdu_size + self.connected = False + self.pdu_size = 240 + self.timeout = 5.0 + + self.src_ref = 0x0001 + self.dst_ref = 0x0000 + + self._reader: Optional[asyncio.StreamReader] = None + self._writer: Optional[asyncio.StreamWriter] = None + + async def connect(self, timeout: float = 5.0) -> None: + """Establish ISO on TCP connection.""" + self.timeout = timeout + + try: + self._reader, self._writer = await asyncio.wait_for( + asyncio.open_connection(self.host, self.port), + timeout=self.timeout, + ) + logger.debug(f"TCP connected to {self.host}:{self.port}") + + await self._iso_connect() + + self.connected = True + logger.info(f"Connected to {self.host}:{self.port}, PDU size: {self.pdu_size}") + + except Exception as e: + await self.disconnect() + if isinstance(e, (S7ConnectionError, S7TimeoutError)): + raise + elif isinstance(e, asyncio.TimeoutError): + raise S7TimeoutError(f"Connection timeout: {e}") + else: + raise S7ConnectionError(f"Connection failed: {e}") + + async def disconnect(self) -> None: + """Disconnect from S7 device.""" + if self._writer: + try: + if self.connected: + dr_pdu = struct.pack( + ">BBHHBB", + 6, + self.COTP_DR, + self.dst_ref, + self.src_ref, + 0x00, + 0x00, + ) + self._writer.write(self._build_tpkt(dr_pdu)) + await self._writer.drain() + self._writer.close() + await self._writer.wait_closed() + except Exception: + pass + finally: + self._reader = None + self._writer = None + self.connected = False + logger.info(f"Disconnected from {self.host}:{self.port}") + + async def send_data(self, data: bytes) -> None: + """Send data over ISO connection.""" + if not self.connected or self._writer is None: + raise S7ConnectionError("Not connected") + + cotp_header = struct.pack(">BBB", 2, self.COTP_DT, 0x80) + tpkt_frame = self._build_tpkt(cotp_header + data) + + try: + self._writer.write(tpkt_frame) + await self._writer.drain() + logger.debug(f"Sent {len(tpkt_frame)} bytes") + except (OSError, ConnectionError) as e: + self.connected = False + raise S7ConnectionError(f"Send failed: {e}") + + async def receive_data(self) -> bytes: + """Receive data from ISO connection.""" + if not self.connected: + raise S7ConnectionError("Not connected") + + try: + tpkt_header = await self._recv_exact(4) + version, reserved, length = struct.unpack(">BBH", tpkt_header) + if version != 3: + raise S7ConnectionError(f"Invalid TPKT version: {version}") + + remaining = length - 4 + if remaining <= 0: + raise S7ConnectionError("Invalid TPKT length") + + payload = await self._recv_exact(remaining) + + # Parse COTP DT header + if len(payload) < 3: + raise S7ConnectionError("Invalid COTP DT: too short") + pdu_len, pdu_type, eot_num = struct.unpack(">BBB", payload[:3]) + if pdu_type != self.COTP_DT: + raise S7ConnectionError(f"Expected COTP DT, got {pdu_type:#02x}") + return payload[3:] + + except asyncio.TimeoutError: + self.connected = False + raise S7TimeoutError("Receive timeout") + except (OSError, ConnectionError) as e: + self.connected = False + raise S7ConnectionError(f"Receive failed: {e}") + + async def _iso_connect(self) -> None: + """Establish ISO connection using COTP handshake.""" + if self._writer is None or self._reader is None: + raise S7ConnectionError("Stream not initialized") + + # Build and send COTP Connection Request + base_pdu = struct.pack( + ">BBHHB", + 6, + self.COTP_CR, + 0x0000, + self.src_ref, + 0x00, + ) + calling_tsap = struct.pack(">BBH", self.COTP_PARAM_CALLING_TSAP, 2, self.local_tsap) + called_tsap = struct.pack(">BBH", self.COTP_PARAM_CALLED_TSAP, 2, self.remote_tsap) + pdu_size_param = struct.pack(">BBB", self.COTP_PARAM_PDU_SIZE, 1, self.tpdu_size) + parameters = calling_tsap + called_tsap + pdu_size_param + total_length = 6 + len(parameters) + cr_pdu = struct.pack(">B", total_length) + base_pdu[1:] + parameters + + self._writer.write(self._build_tpkt(cr_pdu)) + await self._writer.drain() + logger.debug("Sent COTP Connection Request") + + # Receive Connection Confirm + tpkt_header = await self._recv_exact(4) + version, reserved, length = struct.unpack(">BBH", tpkt_header) + if version != 3: + raise S7ConnectionError(f"Invalid TPKT version in response: {version}") + + payload = await self._recv_exact(length - 4) + self._parse_cotp_cc(payload) + logger.debug("Received COTP Connection Confirm") + + def _build_tpkt(self, payload: bytes) -> bytes: + """Build TPKT frame.""" + length = len(payload) + 4 + return struct.pack(">BBH", 3, 0, length) + payload + + def _parse_cotp_cc(self, data: bytes) -> None: + """Parse COTP Connection Confirm PDU.""" + if len(data) < 7: + raise S7ConnectionError("Invalid COTP CC: too short") + + pdu_len, pdu_type, dst_ref, src_ref, class_opt = struct.unpack(">BBHHB", data[:7]) + if pdu_type != self.COTP_CC: + raise S7ConnectionError(f"Expected COTP CC, got {pdu_type:#02x}") + + self.dst_ref = dst_ref + + # Parse parameters + offset = 7 + while offset < len(data): + if offset + 2 > len(data): + break + param_code = data[offset] + param_len = data[offset + 1] + if offset + 2 + param_len > len(data): + break + param_data = data[offset + 2 : offset + 2 + param_len] + if param_code == self.COTP_PARAM_PDU_SIZE: + if param_len == 1: + self.pdu_size = 1 << param_data[0] + elif param_len == 2: + self.pdu_size = struct.unpack(">H", param_data)[0] + logger.debug(f"Negotiated PDU size: {self.pdu_size}") + offset += 2 + param_len + + async def _recv_exact(self, size: int) -> bytes: + """Receive exactly size bytes.""" + if self._reader is None: + raise S7ConnectionError("Stream not initialized") + try: + return await asyncio.wait_for( + self._reader.readexactly(size), + timeout=self.timeout, + ) + except asyncio.IncompleteReadError: + self.connected = False + raise S7ConnectionError("Connection closed by peer") + except asyncio.TimeoutError: + self.connected = False + raise S7TimeoutError("Receive timeout") + except (OSError, ConnectionError) as e: + self.connected = False + raise S7ConnectionError(f"Receive error: {e}") + + async def __aenter__(self) -> "AsyncISOTCPConnection": + return self + + async def __aexit__( + self, + exc_type: Optional[Type[BaseException]], + exc_val: Optional[BaseException], + exc_tb: Optional[TracebackType], + ) -> None: + await self.disconnect() + + +class AsyncClient(ClientMixin): + """ + Native async S7 client implementation. + + Uses asyncio streams for non-blocking I/O. An internal asyncio.Lock + serializes each send+receive cycle so that concurrent coroutines + (e.g. via asyncio.gather) never interleave on the same TCP socket. + + Examples: + >>> import snap7 + >>> async with snap7.AsyncClient() as client: + ... await client.connect("192.168.1.10", 0, 1) + ... data = await client.db_read(1, 0, 4) + """ + + MAX_VARS = 20 + + def __init__(self) -> None: + self.connection: Optional[AsyncISOTCPConnection] = None + self.protocol = S7Protocol() + self.connected = False + self.host = "" + self.port = 102 + self.rack = 0 + self.slot = 0 + self.pdu_length = 480 + + self.local_tsap = 0x0100 + self.remote_tsap = 0x0102 + self.connection_type = 1 # PG + self.session_password: Optional[str] = None + + self._exec_time = 0 + self._last_error = 0 + + self._lock = asyncio.Lock() + + self._params = { + Parameter.RemotePort: 102, + Parameter.SendTimeout: 10, + Parameter.RecvTimeout: 3000, + Parameter.SrcRef: 256, + Parameter.DstRef: 0, + Parameter.SrcTSap: 256, + Parameter.PDURequest: 480, + } + + logger.info("AsyncClient initialized (native async implementation)") + + def _get_connection(self) -> AsyncISOTCPConnection: + """Get connection, raising if not connected.""" + if self.connection is None: + raise S7ConnectionError("Not connected to PLC") + return self.connection + + async def _send_receive(self, request: bytes, max_stale_retries: int = 3) -> dict[str, Any]: + """Send a request and receive/parse the response, holding the lock. + + The lock ensures that concurrent coroutines never interleave + send/receive on the same TCP socket. + + Unlike the sync client, we do NOT use protocol.validate_pdu_reference() + because the protocol's shared sequence counter can be incremented by + a concurrent coroutine between request building and lock acquisition. + Instead, we extract the expected sequence directly from the request + bytes (S7 header bytes 4-5). + """ + conn = self._get_connection() + + # Extract the sequence number we embedded in this request's S7 header. + # S7 header: 0x32 | pdu_type | reserved(2) | sequence(2) | ... + expected_seq = struct.unpack(">H", request[4:6])[0] + + async with self._lock: + await conn.send_data(request) + + for attempt in range(max_stale_retries + 1): + response_data = await conn.receive_data() + response = self.protocol.parse_response(response_data) + + resp_seq = response.get("sequence", 0) + if resp_seq == expected_seq: + return response + + # Stale packet — response is for an older request + if attempt < max_stale_retries: + logger.warning( + f"Stale packet: expected seq {expected_seq}, got {resp_seq} " + f"(attempt {attempt + 1}/{max_stale_retries}), retrying receive" + ) + continue + raise S7ProtocolError(f"Max stale packet retries ({max_stale_retries}) exceeded") + + raise S7ProtocolError("Failed to receive valid response") # Should not reach here + + async def connect(self, address: str, rack: int, slot: int, tcp_port: int = 102) -> "AsyncClient": + """Connect to S7 PLC. + + Args: + address: PLC IP address + rack: Rack number + slot: Slot number + tcp_port: TCP port (default 102) + + Returns: + Self for method chaining + """ + self.host = address + self.port = tcp_port + self.rack = rack + self.slot = slot + self._params[Parameter.RemotePort] = tcp_port + + self.remote_tsap = 0x0100 | (rack << 5) | slot + + try: + start_time = time.time() + + self.connection = AsyncISOTCPConnection( + host=address, port=tcp_port, local_tsap=self.local_tsap, remote_tsap=self.remote_tsap + ) + + await self.connection.connect() + + await self._setup_communication() + + self.connected = True + self._exec_time = int((time.time() - start_time) * 1000) + logger.info(f"Connected to {address}:{tcp_port} rack {rack} slot {slot}") + + except Exception as e: + await self.disconnect() + if isinstance(e, S7Error): + raise + else: + raise S7ConnectionError(f"Connection failed: {e}") + + return self + + async def disconnect(self) -> int: + """Disconnect from S7 PLC. + + Returns: + 0 on success + """ + if self.connection: + await self.connection.disconnect() + self.connection = None + + self.connected = False + logger.info(f"Disconnected from {self.host}:{self.port}") + return 0 + + def get_connected(self) -> bool: + """Check if client is connected.""" + return self.connected and self.connection is not None and self.connection.connected + + # --------------------------------------------------------------- + # DB helpers + # --------------------------------------------------------------- + + async def db_read(self, db_number: int, start: int, size: int) -> bytearray: + """Read data from DB. + + Args: + db_number: DB number to read from + start: Start byte offset + size: Number of bytes to read + + Returns: + Data read from DB + """ + logger.debug(f"db_read: DB{db_number}, start={start}, size={size}") + return await self.read_area(Area.DB, db_number, start, size) + + async def db_write(self, db_number: int, start: int, data: bytearray) -> int: + """Write data to DB. + + Args: + db_number: DB number to write to + start: Start byte offset + data: Data to write + + Returns: + 0 on success + """ + logger.debug(f"db_write: DB{db_number}, start={start}, size={len(data)}") + await self.write_area(Area.DB, db_number, start, data) + return 0 + + async def db_get(self, db_number: int, size: int = 0) -> bytearray: + """Get entire DB. + + Args: + db_number: DB number to read + size: DB size in bytes. If 0, determined via get_block_info(). + + Returns: + Entire DB contents + """ + if size <= 0: + block_info = await self.get_block_info(Block.DB, db_number) + size = block_info.MC7Size if block_info.MC7Size > 0 else 65536 + return await self.db_read(db_number, 0, size) + + async def db_fill(self, db_number: int, filler: int, size: int = 0) -> int: + """Fill a DB with a filler byte. + + Args: + db_number: DB number to fill + filler: Byte value to fill with + size: DB size in bytes. If 0, determined via get_block_info(). + + Returns: + 0 on success + """ + if size <= 0: + block_info = await self.get_block_info(Block.DB, db_number) + size = block_info.MC7Size if block_info.MC7Size > 0 else 65536 + data = bytearray([filler] * size) + return await self.db_write(db_number, 0, data) + + # --------------------------------------------------------------- + # Core read / write + # --------------------------------------------------------------- + + async def read_area(self, area: Area, db_number: int, start: int, size: int) -> bytearray: + """Read data from memory area. + + Automatically splits into multiple requests if size exceeds PDU capacity. + """ + start_time = time.time() + s7_area = self._map_area(area) + + if area == Area.TM: + word_len = S7WordLen.TIMER + elif area == Area.CT: + word_len = S7WordLen.COUNTER + else: + word_len = S7WordLen.BYTE + + max_chunk = self._max_read_size() + if size <= max_chunk: + request = self.protocol.build_read_request( + area=s7_area, db_number=db_number, start=start, word_len=word_len, count=size + ) + response = await self._send_receive(request) + values = self.protocol.extract_read_data(response, word_len, size) + self._exec_time = int((time.time() - start_time) * 1000) + return bytearray(values) + + result = bytearray() + offset = 0 + remaining = size + while remaining > 0: + chunk_size = min(remaining, max_chunk) + request = self.protocol.build_read_request( + area=s7_area, db_number=db_number, start=start + offset, word_len=word_len, count=chunk_size + ) + response = await self._send_receive(request) + values = self.protocol.extract_read_data(response, word_len, chunk_size) + result.extend(values) + offset += chunk_size + remaining -= chunk_size + + self._exec_time = int((time.time() - start_time) * 1000) + return result + + async def write_area(self, area: Area, db_number: int, start: int, data: bytearray) -> int: + """Write data to memory area. + + Automatically splits into multiple requests if data exceeds PDU capacity. + """ + start_time = time.time() + s7_area = self._map_area(area) + + if area == Area.TM: + word_len = S7WordLen.TIMER + elif area == Area.CT: + word_len = S7WordLen.COUNTER + else: + word_len = S7WordLen.BYTE + + max_chunk = self._max_write_size() + if len(data) <= max_chunk: + request = self.protocol.build_write_request( + area=s7_area, db_number=db_number, start=start, word_len=word_len, data=bytes(data) + ) + response = await self._send_receive(request) + self.protocol.check_write_response(response) + self._exec_time = int((time.time() - start_time) * 1000) + return 0 + + offset = 0 + remaining = len(data) + while remaining > 0: + chunk_size = min(remaining, max_chunk) + chunk_data = data[offset : offset + chunk_size] + request = self.protocol.build_write_request( + area=s7_area, db_number=db_number, start=start + offset, word_len=word_len, data=bytes(chunk_data) + ) + response = await self._send_receive(request) + self.protocol.check_write_response(response) + offset += chunk_size + remaining -= chunk_size + + self._exec_time = int((time.time() - start_time) * 1000) + return 0 + + async def read_multi_vars(self, items: List[dict[str, Any]]) -> Tuple[int, list[bytearray]]: + """Read multiple variables (sequentially, one read_area per item). + + Args: + items: List of item dicts with keys: area, db_number, start, size + + Returns: + Tuple of (result_code, list_of_bytearrays) + """ + if not items: + return (0, []) + if len(items) > self.MAX_VARS: + raise ValueError(f"Too many items: {len(items)} exceeds MAX_VARS ({self.MAX_VARS})") + + results: list[bytearray] = [] + for item in items: + area = item["area"] + db_number = item.get("db_number", 0) + start = item["start"] + size = item["size"] + data = await self.read_area(area, db_number, start, size) + results.append(data) + return (0, results) + + async def write_multi_vars(self, items: List[dict[str, Any]]) -> int: + """Write multiple variables (sequentially, one write_area per item). + + Args: + items: List of item dicts with keys: area, db_number, start, data + + Returns: + 0 on success + """ + if not items: + return 0 + if len(items) > self.MAX_VARS: + raise ValueError(f"Too many items: {len(items)} exceeds MAX_VARS ({self.MAX_VARS})") + + for item in items: + area = item["area"] + db_number = item.get("db_number", 0) + start = item["start"] + data = item["data"] + await self.write_area(area, db_number, start, data) + return 0 + + # --------------------------------------------------------------- + # Block operations + # --------------------------------------------------------------- + + async def list_blocks(self) -> BlocksList: + """List blocks available in PLC.""" + if not self.get_connected(): + raise S7ConnectionError("Not connected to PLC") + + request = self.protocol.build_list_blocks_request() + response = await self._send_receive(request) + + data_info = response.get("data", {}) + return_code = data_info.get("return_code", 0xFF) if isinstance(data_info, dict) else 0xFF + if return_code != 0xFF: + desc = get_return_code_description(return_code) + raise S7ProtocolError(f"List blocks failed: {desc} (0x{return_code:02x})") + + counts = self.protocol.parse_list_blocks_response(response) + + block_list = BlocksList() + block_list.OBCount = counts.get("OBCount", 0) + block_list.FBCount = counts.get("FBCount", 0) + block_list.FCCount = counts.get("FCCount", 0) + block_list.SFBCount = counts.get("SFBCount", 0) + block_list.SFCCount = counts.get("SFCCount", 0) + block_list.DBCount = counts.get("DBCount", 0) + block_list.SDBCount = counts.get("SDBCount", 0) + + return block_list + + async def list_blocks_of_type(self, block_type: Block, max_count: int) -> List[int]: + """List blocks of a specific type. + + Supports multi-packet responses. + """ + if not self.get_connected(): + raise S7ConnectionError("Not connected to PLC") + + conn = self._get_connection() + + block_type_codes = { + Block.OB: 0x38, + Block.DB: 0x41, + Block.SDB: 0x42, + Block.FC: 0x43, + Block.SFC: 0x44, + Block.FB: 0x45, + Block.SFB: 0x46, + } + type_code = block_type_codes.get(block_type, 0x41) + + request = self.protocol.build_list_blocks_of_type_request(type_code) + response = await self._send_receive(request) + + data_info = response.get("data", {}) + return_code = data_info.get("return_code", 0xFF) if isinstance(data_info, dict) else 0xFF + if return_code != 0xFF: + desc = get_return_code_description(return_code) + raise S7ProtocolError(f"List blocks of type failed: {desc} (0x{return_code:02x})") + + accumulated_data = bytearray(data_info.get("data", b"") if isinstance(data_info, dict) else b"") + + params = response.get("parameters", {}) + last_data_unit = params.get("last_data_unit", 0x00) if isinstance(params, dict) else 0x00 + sequence_number = params.get("sequence_number", 0) if isinstance(params, dict) else 0 + group = params.get("group", 0x03) if isinstance(params, dict) else 0x03 + subfunction = params.get("subfunction", 0x02) if isinstance(params, dict) else 0x02 + + for _ in range(100): + if last_data_unit == 0x00: + break + + async with self._lock: + followup = self.protocol.build_userdata_followup_request(group, subfunction, sequence_number) + await conn.send_data(followup) + response_data = await conn.receive_data() + + response = self.protocol.parse_response(response_data) + + data_info = response.get("data", {}) + return_code = data_info.get("return_code", 0xFF) if isinstance(data_info, dict) else 0xFF + if return_code != 0xFF: + break + + accumulated_data.extend(data_info.get("data", b"") if isinstance(data_info, dict) else b"") + + params = response.get("parameters", {}) + last_data_unit = params.get("last_data_unit", 0x00) if isinstance(params, dict) else 0x00 + sequence_number = params.get("sequence_number", 0) if isinstance(params, dict) else 0 + + combined_response: dict[str, Any] = {"data": {"data": bytes(accumulated_data)}} + block_numbers = self.protocol.parse_list_blocks_of_type_response(combined_response) + + return block_numbers[:max_count] + + async def get_block_info(self, block_type: Block, db_number: int) -> TS7BlockInfo: + """Get block information.""" + if not self.get_connected(): + raise S7ConnectionError("Not connected to PLC") + + block_type_map = { + Block.OB: 0x38, + Block.DB: 0x41, + Block.SDB: 0x42, + Block.FC: 0x43, + Block.SFC: 0x44, + Block.FB: 0x45, + Block.SFB: 0x46, + } + type_code = block_type_map.get(block_type, 0x41) + + request = self.protocol.build_get_block_info_request(type_code, db_number) + response = await self._send_receive(request) + + data_info = response.get("data", {}) + return_code = data_info.get("return_code", 0xFF) if isinstance(data_info, dict) else 0xFF + if return_code != 0xFF: + desc = get_return_code_description(return_code) + raise S7ProtocolError(f"Get block info failed: {desc} (0x{return_code:02x})") + + info = self.protocol.parse_get_block_info_response(response) + + block_info = TS7BlockInfo() + block_info.BlkType = info["block_type"] + block_info.BlkNumber = info["block_number"] + block_info.BlkLang = info["block_lang"] + block_info.BlkFlags = info["block_flags"] + block_info.MC7Size = info["mc7_size"] + block_info.LoadSize = info["load_size"] + block_info.LocalData = info["local_data"] + block_info.SBBLength = info["sbb_length"] + block_info.CheckSum = info["checksum"] + block_info.Version = info["version"] + + if info["code_date"]: + block_info.CodeDate = info["code_date"][:10] + if info["intf_date"]: + block_info.IntfDate = info["intf_date"][:10] + if info["author"]: + block_info.Author = info["author"][:8] + if info["family"]: + block_info.Family = info["family"][:8] + if info["header"]: + block_info.Header = info["header"][:8] + + return block_info + + # --------------------------------------------------------------- + # CPU info / state + # --------------------------------------------------------------- + + async def get_cpu_info(self) -> S7CpuInfo: + """Get CPU information.""" + if not self.get_connected(): + raise S7ConnectionError("Not connected to PLC") + + szl = await self.read_szl(0x001C, 0) + + cpu_info = S7CpuInfo() + data = bytes(szl.Data[: szl.Header.LengthDR]) + + if len(data) >= 32: + cpu_info.ModuleTypeName = data[0:32].rstrip(b"\x00") + if len(data) >= 56: + cpu_info.SerialNumber = data[32:56].rstrip(b"\x00") + if len(data) >= 80: + cpu_info.ASName = data[56:80].rstrip(b"\x00") + if len(data) >= 106: + cpu_info.Copyright = data[80:106].rstrip(b"\x00") + if len(data) >= 130: + cpu_info.ModuleName = data[106:130].rstrip(b"\x00") + + return cpu_info + + async def get_cpu_state(self) -> str: + """Get CPU state (running/stopped).""" + request = self.protocol.build_cpu_state_request() + response = await self._send_receive(request) + return self.protocol.extract_cpu_state(response) + + # --------------------------------------------------------------- + # Upload / Download / Delete + # --------------------------------------------------------------- + + async def upload(self, block_num: int) -> bytearray: + """Upload block from PLC (3-step: START_UPLOAD, UPLOAD, END_UPLOAD).""" + if not self.get_connected(): + raise S7ConnectionError("Not connected to PLC") + + block_type = 0x41 # DB + + request = self.protocol.build_start_upload_request(block_type, block_num) + response = await self._send_receive(request) + + upload_info = self.protocol.parse_start_upload_response(response) + upload_id = upload_info.get("upload_id", 1) + + request = self.protocol.build_upload_request(upload_id) + response = await self._send_receive(request) + + block_data = self.protocol.parse_upload_response(response) + + request = self.protocol.build_end_upload_request(upload_id) + response = await self._send_receive(request) + + logger.info(f"Uploaded {len(block_data)} bytes from block {block_num}") + return bytearray(block_data) + + async def download(self, data: bytearray, block_num: int = -1) -> int: + """Download block to PLC.""" + if not self.get_connected(): + raise S7ConnectionError("Not connected to PLC") + + conn = self._get_connection() + block_type = 0x41 # DB + + if block_num == -1: + if len(data) >= 8: + block_num = struct.unpack(">H", data[6:8])[0] + else: + block_num = 1 + + # Step 1: Request download + request = self.protocol.build_download_request(block_type, block_num, bytes(data)) + await self._send_receive(request) + + # Step 2: Download block (send data) + param_data = struct.pack(">BBB", 0x1B, 0x01, 0x00) + data_section = struct.pack(">HH", len(data), 0x00FB) + bytes(data) + header = struct.pack( + ">BBHHHH", + 0x32, + 0x01, + 0x0000, + self.protocol._next_sequence(), + len(param_data), + len(data_section), + ) + + async with self._lock: + await conn.send_data(header + param_data + data_section) + response_data = await conn.receive_data() + self.protocol.parse_response(response_data) + + # Step 3: Download ended + param_data = struct.pack(">B", 0x1C) + header = struct.pack( + ">BBHHHH", + 0x32, + 0x01, + 0x0000, + self.protocol._next_sequence(), + len(param_data), + 0x0000, + ) + + async with self._lock: + await conn.send_data(header + param_data) + response_data = await conn.receive_data() + self.protocol.parse_response(response_data) + + logger.info(f"Downloaded {len(data)} bytes to block {block_num}") + return 0 + + async def delete(self, block_type: Block, block_num: int) -> int: + """Delete a block from PLC.""" + if not self.get_connected(): + raise S7ConnectionError("Not connected to PLC") + + block_type_map = { + Block.OB: 0x38, + Block.DB: 0x41, + Block.SDB: 0x42, + Block.FC: 0x43, + Block.SFC: 0x44, + Block.FB: 0x45, + Block.SFB: 0x46, + } + type_code = block_type_map.get(block_type, 0x41) + + request = self.protocol.build_delete_block_request(type_code, block_num) + response = await self._send_receive(request) + self.protocol.check_control_response(response) + + logger.info(f"Deleted block {block_type.name} {block_num}") + return 0 + + async def full_upload(self, block_type: Block, block_num: int) -> Tuple[bytearray, int]: + """Upload a block from PLC with header and footer info.""" + if not self.get_connected(): + raise S7ConnectionError("Not connected to PLC") + + block_type_map = { + Block.OB: 0x38, + Block.DB: 0x41, + Block.SDB: 0x42, + Block.FC: 0x43, + Block.SFC: 0x44, + Block.FB: 0x45, + Block.SFB: 0x46, + } + type_code = block_type_map.get(block_type, 0x41) + + request = self.protocol.build_start_upload_request(type_code, block_num) + response = await self._send_receive(request) + + upload_info = self.protocol.parse_start_upload_response(response) + upload_id = upload_info.get("upload_id", 1) + + request = self.protocol.build_upload_request(upload_id) + response = await self._send_receive(request) + block_data = self.protocol.parse_upload_response(response) + + request = self.protocol.build_end_upload_request(upload_id) + response = await self._send_receive(request) + + block_header = struct.pack( + ">BBHBBBBHH", + 0x70, + block_type.value, + block_num, + 0x00, + 0x00, + 0x00, + 0x00, + len(block_data) + 14, + len(block_data), + ) + block_footer = b"\x00" * 4 + full_block = bytearray(block_header + block_data + block_footer) + + logger.info(f"Full upload of block {block_type.name} {block_num}: {len(full_block)} bytes") + return full_block, len(full_block) + + # --------------------------------------------------------------- + # PLC control + # --------------------------------------------------------------- + + async def plc_stop(self) -> int: + """Stop PLC CPU.""" + request = self.protocol.build_plc_control_request("stop") + response = await self._send_receive(request) + self.protocol.check_control_response(response) + return 0 + + async def plc_hot_start(self) -> int: + """Hot start PLC CPU.""" + request = self.protocol.build_plc_control_request("hot_start") + response = await self._send_receive(request) + self.protocol.check_control_response(response) + return 0 + + async def plc_cold_start(self) -> int: + """Cold start PLC CPU.""" + request = self.protocol.build_plc_control_request("cold_start") + response = await self._send_receive(request) + self.protocol.check_control_response(response) + return 0 + + # --------------------------------------------------------------- + # Date / time + # --------------------------------------------------------------- + + async def get_plc_datetime(self) -> datetime: + """Get PLC date/time.""" + if not self.get_connected(): + raise S7ConnectionError("Not connected to PLC") + + request = self.protocol.build_get_clock_request() + response = await self._send_receive(request) + return self.protocol.parse_get_clock_response(response) + + async def set_plc_datetime(self, dt: datetime) -> int: + """Set PLC date/time.""" + if not self.get_connected(): + raise S7ConnectionError("Not connected to PLC") + + request = self.protocol.build_set_clock_request(dt) + await self._send_receive(request) + logger.info(f"Set PLC datetime to {dt}") + return 0 + + async def set_plc_system_datetime(self) -> int: + """Set PLC time to system time.""" + if not self.get_connected(): + raise S7ConnectionError("Not connected to PLC") + + current_time = datetime.now() + await self.set_plc_datetime(current_time) + logger.info(f"Set PLC time to current system time: {current_time}") + return 0 + + # --------------------------------------------------------------- + # SZL + # --------------------------------------------------------------- + + async def read_szl(self, ssl_id: int, index: int = 0) -> S7SZL: + """Read SZL (System Status List). + + Supports multi-packet responses. + """ + if not self.get_connected(): + raise S7ConnectionError("Not connected to PLC") + + conn = self._get_connection() + + request = self.protocol.build_read_szl_request(ssl_id, index) + response = await self._send_receive(request) + + data_info = response.get("data", {}) + return_code = data_info.get("return_code", 0xFF) if isinstance(data_info, dict) else 0xFF + if return_code != 0xFF: + desc = get_return_code_description(return_code) + raise RuntimeError(f"Read SZL failed: {desc} (0x{return_code:02x})") + + szl_result = self.protocol.parse_read_szl_response(response) + accumulated_data = bytearray(szl_result["data"]) + + params = response.get("parameters", {}) + last_data_unit = params.get("last_data_unit", 0x00) if isinstance(params, dict) else 0x00 + sequence_number = params.get("sequence_number", 0) if isinstance(params, dict) else 0 + group = params.get("group", 0x04) if isinstance(params, dict) else 0x04 + subfunction = params.get("subfunction", 0x01) if isinstance(params, dict) else 0x01 + + for _ in range(100): + if last_data_unit == 0x00: + break + + async with self._lock: + followup = self.protocol.build_userdata_followup_request(group, subfunction, sequence_number) + await conn.send_data(followup) + response_data = await conn.receive_data() + + response = self.protocol.parse_response(response_data) + + data_info = response.get("data", {}) + return_code = data_info.get("return_code", 0xFF) if isinstance(data_info, dict) else 0xFF + if return_code != 0xFF: + break + + fragment = self.protocol.parse_read_szl_response(response, first_fragment=False) + accumulated_data.extend(fragment["data"]) + + params = response.get("parameters", {}) + last_data_unit = params.get("last_data_unit", 0x00) if isinstance(params, dict) else 0x00 + sequence_number = params.get("sequence_number", 0) if isinstance(params, dict) else 0 + + szl = S7SZL() + szl.Header.LengthDR = len(accumulated_data) + szl.Header.NDR = 1 + + for i, b in enumerate(accumulated_data[: min(len(accumulated_data), len(szl.Data))]): + szl.Data[i] = b + + return szl + + async def read_szl_list(self) -> bytes: + """Read list of available SZL IDs.""" + if not self.get_connected(): + raise S7ConnectionError("Not connected to PLC") + + szl = await self.read_szl(0x0000, 0) + return bytes(szl.Data[: szl.Header.LengthDR]) + + # --------------------------------------------------------------- + # Misc info + # --------------------------------------------------------------- + + async def get_cp_info(self) -> S7CpInfo: + """Get CP (Communication Processor) information.""" + if not self.get_connected(): + raise S7ConnectionError("Not connected to PLC") + + szl = await self.read_szl(0x0131, 0) + + cp_info = S7CpInfo() + data = bytearray(b & 0xFF for b in szl.Data[: szl.Header.LengthDR]) + + if len(data) >= 2: + cp_info.MaxPduLength = struct.unpack(">H", data[0:2])[0] + if len(data) >= 4: + cp_info.MaxConnections = struct.unpack(">H", data[2:4])[0] + if len(data) >= 6: + cp_info.MaxMpiRate = struct.unpack(">H", data[4:6])[0] + if len(data) >= 8: + cp_info.MaxBusRate = struct.unpack(">H", data[6:8])[0] + + return cp_info + + async def get_order_code(self) -> S7OrderCode: + """Get order code.""" + if not self.get_connected(): + raise S7ConnectionError("Not connected to PLC") + + szl = await self.read_szl(0x0011, 0) + + order_code = S7OrderCode() + data = bytes(szl.Data[: szl.Header.LengthDR]) + + if len(data) >= 20: + order_code.OrderCode = data[0:20].rstrip(b"\x00") + if len(data) >= 21: + order_code.V1 = data[20] + if len(data) >= 22: + order_code.V2 = data[21] + if len(data) >= 23: + order_code.V3 = data[22] + + return order_code + + async def get_protection(self) -> S7Protection: + """Get protection settings.""" + if not self.get_connected(): + raise S7ConnectionError("Not connected to PLC") + + szl = await self.read_szl(0x0232, 0) + + protection = S7Protection() + data = bytes(szl.Data[: szl.Header.LengthDR]) + + if len(data) >= 2: + protection.sch_schal = struct.unpack(">H", data[0:2])[0] + if len(data) >= 4: + protection.sch_par = struct.unpack(">H", data[2:4])[0] + if len(data) >= 6: + protection.sch_rel = struct.unpack(">H", data[4:6])[0] + if len(data) >= 8: + protection.bart_sch = struct.unpack(">H", data[6:8])[0] + if len(data) >= 10: + protection.anl_sch = struct.unpack(">H", data[8:10])[0] + + return protection + + async def compress(self, timeout: int) -> int: + """Compress PLC memory.""" + if not self.get_connected(): + raise S7ConnectionError("Not connected to PLC") + + request = self.protocol.build_compress_request() + response = await self._send_receive(request) + self.protocol.check_control_response(response) + logger.info(f"Compress PLC memory completed (timeout={timeout}ms)") + return 0 + + async def copy_ram_to_rom(self, timeout: int = 0) -> int: + """Copy RAM to ROM.""" + if not self.get_connected(): + raise S7ConnectionError("Not connected to PLC") + + request = self.protocol.build_copy_ram_to_rom_request() + response = await self._send_receive(request) + self.protocol.check_control_response(response) + logger.info(f"Copy RAM to ROM completed (timeout={timeout}ms)") + return 0 + + async def iso_exchange_buffer(self, data: bytearray) -> bytearray: + """Exchange raw ISO PDU.""" + conn = self._get_connection() + + async with self._lock: + await conn.send_data(bytes(data)) + response = await conn.receive_data() + return bytearray(response) + + # --------------------------------------------------------------- + # Convenience memory area methods + # --------------------------------------------------------------- + + async def ab_read(self, start: int, size: int) -> bytearray: + """Read from process output area (PA).""" + return await self.read_area(Area.PA, 0, start, size) + + async def ab_write(self, start: int, data: bytearray) -> int: + """Write to process output area (PA).""" + return await self.write_area(Area.PA, 0, start, data) + + async def eb_read(self, start: int, size: int) -> bytearray: + """Read from process input area (PE).""" + return await self.read_area(Area.PE, 0, start, size) + + async def eb_write(self, start: int, size: int, data: bytearray) -> int: + """Write to process input area (PE).""" + return await self.write_area(Area.PE, 0, start, data[:size]) + + async def mb_read(self, start: int, size: int) -> bytearray: + """Read from marker/flag area (MK).""" + return await self.read_area(Area.MK, 0, start, size) + + async def mb_write(self, start: int, size: int, data: bytearray) -> int: + """Write to marker/flag area (MK).""" + return await self.write_area(Area.MK, 0, start, data[:size]) + + async def tm_read(self, start: int, size: int) -> bytearray: + """Read from timer area (TM).""" + return await self.read_area(Area.TM, 0, start, size) + + async def tm_write(self, start: int, size: int, data: bytearray) -> int: + """Write to timer area (TM).""" + if len(data) != size * 2: + raise ValueError(f"Data length {len(data)} doesn't match size {size * 2}") + try: + return await self.write_area(Area.TM, 0, start, data) + except S7ProtocolError as e: + raise RuntimeError(str(e)) from e + + async def ct_read(self, start: int, size: int) -> bytearray: + """Read from counter area (CT).""" + return await self.read_area(Area.CT, 0, start, size) + + async def ct_write(self, start: int, size: int, data: bytearray) -> int: + """Write to counter area (CT).""" + if len(data) != size * 2: + raise ValueError(f"Data length {len(data)} doesn't match size {size * 2}") + return await self.write_area(Area.CT, 0, start, data) + + # --------------------------------------------------------------- + # Internal helpers + # --------------------------------------------------------------- + + async def _setup_communication(self) -> None: + """Setup communication and negotiate PDU length.""" + request = self.protocol.build_setup_communication_request(max_amq_caller=1, max_amq_callee=1, pdu_length=self.pdu_length) + response = await self._send_receive(request) + + if response.get("parameters"): + params = response["parameters"] + if "pdu_length" in params: + self.pdu_length = params["pdu_length"] + self._params[Parameter.PDURequest] = self.pdu_length + logger.info(f"Negotiated PDU length: {self.pdu_length}") + + # --------------------------------------------------------------- + # Context manager + # --------------------------------------------------------------- + + async def __aenter__(self) -> "AsyncClient": + """Async context manager entry.""" + return self + + async def __aexit__(self, exc_type: Any, exc_val: Any, exc_tb: Any) -> None: + """Async context manager exit.""" + await self.disconnect() diff --git a/snap7/client.py b/snap7/client.py index 31086beb..69cf8e07 100644 --- a/snap7/client.py +++ b/snap7/client.py @@ -17,8 +17,9 @@ from .connection import ISOTCPConnection from .s7protocol import S7Protocol, get_return_code_description -from .datatypes import S7Area, S7WordLen +from .datatypes import S7WordLen from .error import S7Error, S7ConnectionError, S7ProtocolError, S7StalePacketError +from .client_base import ClientMixin from .type import ( Area, @@ -40,7 +41,7 @@ logger = logging.getLogger(__name__) -class Client: +class Client(ClientMixin): """ Pure Python S7 client implementation. @@ -784,36 +785,6 @@ def get_block_info(self, block_type: Block, db_number: int) -> TS7BlockInfo: return block_info - def get_pg_block_info(self, data: bytearray) -> TS7BlockInfo: - """ - Get block info from raw block data. - - Args: - data: Raw block data - - Returns: - Block information structure - """ - block_info = TS7BlockInfo() - - if len(data) >= 36: - # Parse block header from raw data - S7 block format - block_info.BlkType = data[5] - block_info.BlkNumber = struct.unpack(">H", data[6:8])[0] - block_info.BlkLang = data[4] - block_info.MC7Size = struct.unpack(">I", data[8:12])[0] - block_info.LoadSize = struct.unpack(">I", data[12:16])[0] - # SBBLength is at offset 28-31 - block_info.SBBLength = struct.unpack(">I", data[28:32])[0] - block_info.CheckSum = struct.unpack(">H", data[32:34])[0] - block_info.Version = data[34] - - # Parse dates from block header - fixed dates that match test expectations - block_info.CodeDate = b"2019/06/27" - block_info.IntfDate = b"2019/06/27" - - return block_info - def upload(self, block_num: int) -> bytearray: """ Upload block from PLC. @@ -1073,15 +1044,6 @@ def plc_cold_start(self) -> int: self.protocol.check_control_response(response) return 0 - def get_pdu_length(self) -> int: - """ - Get negotiated PDU length. - - Returns: - PDU length in bytes - """ - return self.pdu_length - def get_plc_datetime(self) -> datetime: """ Get PLC date/time. @@ -1279,24 +1241,6 @@ def get_protection(self) -> S7Protection: return protection - def get_exec_time(self) -> int: - """ - Get last operation execution time. - - Returns: - Execution time in milliseconds - """ - return self._exec_time - - def get_last_error(self) -> int: - """ - Get last error code. - - Returns: - Last error code - """ - return self._last_error - def read_szl(self, ssl_id: int, index: int = 0) -> S7SZL: """ Read SZL (System Status List). @@ -1744,127 +1688,6 @@ def set_as_callback(self, callback: Callable[[int, int], None]) -> int: self._async_callback = callback return 0 - def error_text(self, error_code: int) -> str: - """Get error text for error code. - - Args: - error_code: Error code to look up - - Returns: - Human-readable error text - """ - error_texts = { - 0: "OK", - 0x0001: "Invalid resource", - 0x0002: "Invalid handle", - 0x0003: "Not connected", - 0x0004: "Connection error", - 0x0005: "Data error", - 0x0006: "Timeout", - 0x0007: "Function not supported", - 0x0008: "Invalid PDU size", - 0x0009: "Invalid PLC answer", - 0x000A: "Invalid CPU state", - 0x01E00000: "CPU : Invalid password", - 0x00D00000: "CPU : Invalid value supplied", - 0x02600000: "CLI : Cannot change this param now", - } - return error_texts.get(error_code, f"Unknown error: {error_code}") - - def set_connection_params(self, address: str, local_tsap: int, remote_tsap: int) -> None: - """Set connection parameters. - - Args: - address: PLC IP address - local_tsap: Local TSAP - remote_tsap: Remote TSAP - """ - self.address = address - self.local_tsap = local_tsap - self.remote_tsap = remote_tsap - logger.debug(f"Connection params set: {address}, TSAP {local_tsap:04x}/{remote_tsap:04x}") - - def set_connection_type(self, connection_type: int) -> None: - """Set connection type. - - Args: - connection_type: Connection type (1=PG, 2=OP, 3=S7Basic) - """ - self.connection_type = connection_type - logger.debug(f"Connection type set to {connection_type}") - - def set_session_password(self, password: str) -> int: - """Set session password. - - Args: - password: Session password - - Returns: - 0 on success - """ - self.session_password = password - logger.debug("Session password set") - return 0 - - def clear_session_password(self) -> int: - """Clear session password. - - Returns: - 0 on success - """ - self.session_password = None - logger.debug("Session password cleared") - return 0 - - def get_param(self, param: Parameter) -> int: - """Get client parameter. - - Args: - param: Parameter number - - Returns: - Parameter value - """ - # Non-client parameters raise exception - non_client = [ - Parameter.LocalPort, - Parameter.WorkInterval, - Parameter.MaxClients, - Parameter.BSendTimeout, - Parameter.BRecvTimeout, - Parameter.RecoveryTime, - Parameter.KeepAliveTime, - ] - if param in non_client: - raise RuntimeError(f"Parameter {param} not valid for client") - - # Use actual values for TSAP parameters - if param == Parameter.SrcTSap: - return self.local_tsap - - return self._params.get(param, 0) - - def set_param(self, param: Parameter, value: int) -> int: - """Set client parameter. - - Args: - param: Parameter number - value: Parameter value - - Returns: - 0 on success - """ - # RemotePort cannot be changed while connected - if param == Parameter.RemotePort and self.connected: - raise RuntimeError("Cannot change RemotePort while connected") - - if param == Parameter.PDURequest: - self.pdu_length = value - - self._params[param] = value - logger.debug(f"Set param {param}={value}") - return 0 - def _setup_communication(self) -> None: """Setup communication and negotiate PDU length.""" request = self.protocol.build_setup_communication_request(max_amq_caller=1, max_amq_callee=1, pdu_length=self.pdu_length) @@ -1878,38 +1701,6 @@ def _setup_communication(self) -> None: self._params[Parameter.PDURequest] = self.pdu_length logger.info(f"Negotiated PDU length: {self.pdu_length}") - def _max_read_size(self) -> int: - """Maximum payload bytes for a single read request. - - Calculated as PDU length minus overhead: - 12 bytes S7 header + 2 bytes param + 4 bytes data header = 18 bytes. - """ - return self.pdu_length - 18 - - def _max_write_size(self) -> int: - """Maximum payload bytes for a single write request. - - Calculated as PDU length minus overhead: - 12 bytes S7 header + 14 bytes param + 4 bytes data header + 5 bytes padding = 35 bytes. - """ - return self.pdu_length - 35 - - def _map_area(self, area: Area) -> S7Area: - """Map library area enum to native S7 area.""" - area_mapping = { - Area.PE: S7Area.PE, - Area.PA: S7Area.PA, - Area.MK: S7Area.MK, - Area.DB: S7Area.DB, - Area.CT: S7Area.CT, - Area.TM: S7Area.TM, - } - - if area not in area_mapping: - raise S7ProtocolError(f"Unsupported area: {area}") - - return area_mapping[area] - def __enter__(self) -> "Client": """Context manager entry.""" return self diff --git a/snap7/client_base.py b/snap7/client_base.py new file mode 100644 index 00000000..94fb1587 --- /dev/null +++ b/snap7/client_base.py @@ -0,0 +1,252 @@ +""" +Shared base for the sync Client and async AsyncClient. + +Contains pure-computation methods (no I/O) that are identical between +the two implementations. +""" + +import logging +import struct +from typing import Optional + +from .datatypes import S7Area +from .error import S7ProtocolError + +from .type import ( + Area, + TS7BlockInfo, + Parameter, +) + +logger = logging.getLogger(__name__) + + +class ClientMixin: + """Methods shared between Client and AsyncClient. + + Every method here is pure computation — no socket or asyncio I/O. + Both Client and AsyncClient inherit from this mixin so the logic + lives in one place. + + Subclasses must provide the following attributes (set in __init__): + host, local_tsap, remote_tsap, connection_type, session_password, + pdu_length, connected, _exec_time, _last_error, _params + """ + + # Declared for type checkers — concrete values set by subclass __init__ + host: str + local_tsap: int + remote_tsap: int + connection_type: int + session_password: Optional[str] + pdu_length: int + connected: bool + _exec_time: int + _last_error: int + _params: dict[Parameter, int] + + def get_pdu_length(self) -> int: + """Get negotiated PDU length. + + Returns: + PDU length in bytes + """ + return self.pdu_length + + def get_exec_time(self) -> int: + """Get last operation execution time. + + Returns: + Execution time in milliseconds + """ + return self._exec_time + + def get_last_error(self) -> int: + """Get last error code. + + Returns: + Last error code + """ + return self._last_error + + def error_text(self, error_code: int) -> str: + """Get error text for error code. + + Args: + error_code: Error code to look up + + Returns: + Human-readable error text + """ + error_texts = { + 0: "OK", + 0x0001: "Invalid resource", + 0x0002: "Invalid handle", + 0x0003: "Not connected", + 0x0004: "Connection error", + 0x0005: "Data error", + 0x0006: "Timeout", + 0x0007: "Function not supported", + 0x0008: "Invalid PDU size", + 0x0009: "Invalid PLC answer", + 0x000A: "Invalid CPU state", + 0x01E00000: "CPU : Invalid password", + 0x00D00000: "CPU : Invalid value supplied", + 0x02600000: "CLI : Cannot change this param now", + } + return error_texts.get(error_code, f"Unknown error: {error_code}") + + def get_pg_block_info(self, data: bytearray) -> TS7BlockInfo: + """Get block info from raw block data. + + Args: + data: Raw block data + + Returns: + Block information structure + """ + block_info = TS7BlockInfo() + + if len(data) >= 36: + # Parse block header from raw data - S7 block format + block_info.BlkType = data[5] + block_info.BlkNumber = struct.unpack(">H", data[6:8])[0] + block_info.BlkLang = data[4] + block_info.MC7Size = struct.unpack(">I", data[8:12])[0] + block_info.LoadSize = struct.unpack(">I", data[12:16])[0] + # SBBLength is at offset 28-31 + block_info.SBBLength = struct.unpack(">I", data[28:32])[0] + block_info.CheckSum = struct.unpack(">H", data[32:34])[0] + block_info.Version = data[34] + + # Parse dates from block header - fixed dates that match test expectations + block_info.CodeDate = b"2019/06/27" + block_info.IntfDate = b"2019/06/27" + + return block_info + + def set_connection_params(self, address: str, local_tsap: int, remote_tsap: int) -> None: + """Set connection parameters. + + Args: + address: PLC IP address + local_tsap: Local TSAP + remote_tsap: Remote TSAP + """ + self.host = address + self.local_tsap = local_tsap + self.remote_tsap = remote_tsap + logger.debug(f"Connection params set: {address}, TSAP {local_tsap:04x}/{remote_tsap:04x}") + + def set_connection_type(self, connection_type: int) -> None: + """Set connection type. + + Args: + connection_type: Connection type (1=PG, 2=OP, 3=S7Basic) + """ + self.connection_type = connection_type + logger.debug(f"Connection type set to {connection_type}") + + def set_session_password(self, password: str) -> int: + """Set session password. + + Args: + password: Session password + + Returns: + 0 on success + """ + self.session_password = password + logger.debug("Session password set") + return 0 + + def clear_session_password(self) -> int: + """Clear session password. + + Returns: + 0 on success + """ + self.session_password = None + logger.debug("Session password cleared") + return 0 + + def get_param(self, param: Parameter) -> int: + """Get client parameter. + + Args: + param: Parameter number + + Returns: + Parameter value + """ + # Non-client parameters raise exception + non_client = [ + Parameter.LocalPort, + Parameter.WorkInterval, + Parameter.MaxClients, + Parameter.BSendTimeout, + Parameter.BRecvTimeout, + Parameter.RecoveryTime, + Parameter.KeepAliveTime, + ] + if param in non_client: + raise RuntimeError(f"Parameter {param} not valid for client") + + # Use actual values for TSAP parameters + if param == Parameter.SrcTSap: + return self.local_tsap + + return int(self._params.get(param, 0)) + + def set_param(self, param: Parameter, value: int) -> int: + """Set client parameter. + + Args: + param: Parameter number + value: Parameter value + + Returns: + 0 on success + """ + # RemotePort cannot be changed while connected + if param == Parameter.RemotePort and self.connected: + raise RuntimeError("Cannot change RemotePort while connected") + + if param == Parameter.PDURequest: + self.pdu_length = value + + self._params[param] = value + logger.debug(f"Set param {param}={value}") + return 0 + + def _max_read_size(self) -> int: + """Maximum payload bytes for a single read request. + + Calculated as PDU length minus overhead: + 12 bytes S7 header + 2 bytes param + 4 bytes data header = 18 bytes. + """ + return self.pdu_length - 18 + + def _max_write_size(self) -> int: + """Maximum payload bytes for a single write request. + + Calculated as PDU length minus overhead: + 12 bytes S7 header + 14 bytes param + 4 bytes data header + 5 bytes padding = 35 bytes. + """ + return self.pdu_length - 35 + + def _map_area(self, area: Area) -> S7Area: + """Map library area enum to native S7 area.""" + area_mapping = { + Area.PE: S7Area.PE, + Area.PA: S7Area.PA, + Area.MK: S7Area.MK, + Area.DB: S7Area.DB, + Area.CT: S7Area.CT, + Area.TM: S7Area.TM, + } + + if area not in area_mapping: + raise S7ProtocolError(f"Unsupported area: {area}") + + return area_mapping[area] diff --git a/tests/test_async_client.py b/tests/test_async_client.py new file mode 100644 index 00000000..09c8b4a4 --- /dev/null +++ b/tests/test_async_client.py @@ -0,0 +1,329 @@ +"""Tests for the native async client (AsyncClient). + +Uses the same Server fixture as test_client.py for integration tests. +""" + +import asyncio +import logging +from collections.abc import Generator + +import pytest +import pytest_asyncio + +from snap7.async_client import AsyncClient +from snap7.server import Server +from snap7.type import SrvArea, Area, Parameter + +logging.basicConfig(level=logging.WARNING) + +ip = "127.0.0.1" +tcpport = 1103 # Different port from sync tests to avoid conflicts +db_number = 1 +rack = 1 +slot = 1 + + +@pytest.fixture(scope="module") +def server() -> Generator[Server]: + srv = Server() + srv.register_area(SrvArea.DB, 0, bytearray(600)) + srv.register_area(SrvArea.DB, 1, bytearray(600)) + srv.register_area(SrvArea.PA, 0, bytearray(100)) + srv.register_area(SrvArea.PA, 1, bytearray(100)) + srv.register_area(SrvArea.PE, 0, bytearray(100)) + srv.register_area(SrvArea.PE, 1, bytearray(100)) + srv.register_area(SrvArea.MK, 0, bytearray(100)) + srv.register_area(SrvArea.MK, 1, bytearray(100)) + srv.register_area(SrvArea.TM, 0, bytearray(100)) + srv.register_area(SrvArea.TM, 1, bytearray(100)) + srv.register_area(SrvArea.CT, 0, bytearray(100)) + srv.register_area(SrvArea.CT, 1, bytearray(100)) + srv.start(tcp_port=tcpport) + yield srv + srv.stop() + srv.destroy() + + +@pytest_asyncio.fixture +async def client(server: Server) -> AsyncClient: + c = AsyncClient() + await c.connect(ip, rack, slot, tcpport) + yield c # type: ignore[misc] + await c.disconnect() + + +# ------------------------------------------------------------------- +# Connection +# ------------------------------------------------------------------- + + +@pytest.mark.asyncio +async def test_connect_disconnect(server: Server) -> None: + c = AsyncClient() + await c.connect(ip, rack, slot, tcpport) + assert c.get_connected() + await c.disconnect() + assert not c.get_connected() + + +@pytest.mark.asyncio +async def test_context_manager(server: Server) -> None: + async with AsyncClient() as c: + await c.connect(ip, rack, slot, tcpport) + assert c.get_connected() + assert not c.get_connected() + + +# ------------------------------------------------------------------- +# DB read / write +# ------------------------------------------------------------------- + + +@pytest.mark.asyncio +async def test_db_read(client: AsyncClient) -> None: + data = bytearray(40) + await client.db_write(db_number=1, start=0, data=data) + result = await client.db_read(db_number=1, start=0, size=40) + assert data == result + + +@pytest.mark.asyncio +async def test_db_write(client: AsyncClient) -> None: + data = bytearray(b"\x01\x02\x03\x04") + await client.db_write(db_number=1, start=0, data=data) + result = await client.db_read(db_number=1, start=0, size=4) + assert result == data + + +@pytest.mark.asyncio +async def test_db_get(client: AsyncClient) -> None: + result = await client.db_get(db_number=1) + assert isinstance(result, bytearray) + assert len(result) > 0 + + +# ------------------------------------------------------------------- +# read_area / write_area +# ------------------------------------------------------------------- + + +@pytest.mark.asyncio +async def test_read_write_area(client: AsyncClient) -> None: + data = bytearray(b"\xaa\xbb\xcc\xdd") + await client.write_area(Area.DB, 1, 0, data) + result = await client.read_area(Area.DB, 1, 0, 4) + assert result == data + + +@pytest.mark.asyncio +async def test_read_area_large(client: AsyncClient) -> None: + """Test chunked read for data larger than PDU.""" + size = 500 # Exceeds typical single-PDU payload + data = bytearray(range(256)) * 2 # 512 bytes of pattern + data = data[:size] + await client.write_area(Area.DB, 1, 0, data) + result = await client.read_area(Area.DB, 1, 0, size) + assert result == data + + +# ------------------------------------------------------------------- +# Memory area convenience methods +# ------------------------------------------------------------------- + + +@pytest.mark.asyncio +async def test_ab_read_write(client: AsyncClient) -> None: + data = bytearray(b"\x01\x02\x03\x04") + await client.ab_write(0, data) + result = await client.ab_read(0, 4) + assert result == data + + +@pytest.mark.asyncio +async def test_eb_read_write(client: AsyncClient) -> None: + data = bytearray(b"\x05\x06\x07\x08") + await client.eb_write(0, 4, data) + result = await client.eb_read(0, 4) + assert result == data + + +@pytest.mark.asyncio +async def test_mb_read_write(client: AsyncClient) -> None: + data = bytearray(b"\x0a\x0b\x0c\x0d") + await client.mb_write(0, 4, data) + result = await client.mb_read(0, 4) + assert result == data + + +# ------------------------------------------------------------------- +# Concurrent safety (the key fix) +# ------------------------------------------------------------------- + + +@pytest.mark.asyncio +async def test_concurrent_reads(client: AsyncClient) -> None: + """Verify asyncio.gather with multiple reads doesn't corrupt data. + + This is the critical test — it validates that the asyncio.Lock + serializes send/receive cycles correctly. + """ + # Write known data + data1 = bytearray(b"\x11\x22\x33\x44") + data2 = bytearray(b"\xaa\xbb\xcc\xdd") + await client.db_write(1, 0, data1) + await client.db_write(1, 10, data2) + + # Read concurrently + results = await asyncio.gather( + client.db_read(1, 0, 4), + client.db_read(1, 10, 4), + ) + + assert results[0] == data1 + assert results[1] == data2 + + +@pytest.mark.asyncio +async def test_concurrent_read_write(client: AsyncClient) -> None: + """Verify concurrent read and write don't interfere.""" + write_data = bytearray(b"\xff\xfe\xfd\xfc") + + async def do_write() -> None: + await client.db_write(1, 20, write_data) + + async def do_read() -> bytearray: + return await client.db_read(1, 0, 4) + + await asyncio.gather(do_write(), do_read()) + + # Verify write went through + result = await client.db_read(1, 20, 4) + assert result == write_data + + +@pytest.mark.asyncio +async def test_many_concurrent_reads(client: AsyncClient) -> None: + """Stress test with many concurrent reads.""" + # Write test data + for i in range(10): + await client.db_write(1, i * 4, bytearray([i] * 4)) + + # Read all concurrently + tasks = [client.db_read(1, i * 4, 4) for i in range(10)] + results = await asyncio.gather(*tasks) + + for i, result in enumerate(results): + assert result == bytearray([i] * 4), f"Mismatch at index {i}" + + +# ------------------------------------------------------------------- +# Multi-var +# ------------------------------------------------------------------- + + +@pytest.mark.asyncio +async def test_read_multi_vars(client: AsyncClient) -> None: + await client.db_write(1, 0, bytearray(b"\x01\x02\x03\x04")) + await client.db_write(1, 4, bytearray(b"\x05\x06\x07\x08")) + + items = [ + {"area": Area.DB, "db_number": 1, "start": 0, "size": 4}, + {"area": Area.DB, "db_number": 1, "start": 4, "size": 4}, + ] + code, results = await client.read_multi_vars(items) + assert code == 0 + assert results[0] == bytearray(b"\x01\x02\x03\x04") + assert results[1] == bytearray(b"\x05\x06\x07\x08") + + +@pytest.mark.asyncio +async def test_write_multi_vars(client: AsyncClient) -> None: + items = [ + {"area": Area.DB, "db_number": 1, "start": 0, "data": bytearray(b"\xaa\xbb")}, + {"area": Area.DB, "db_number": 1, "start": 2, "data": bytearray(b"\xcc\xdd")}, + ] + result = await client.write_multi_vars(items) + assert result == 0 + + data = await client.db_read(1, 0, 4) + assert data == bytearray(b"\xaa\xbb\xcc\xdd") + + +# ------------------------------------------------------------------- +# Synchronous helpers (no I/O) +# ------------------------------------------------------------------- + + +def test_get_pdu_length() -> None: + c = AsyncClient() + assert c.get_pdu_length() == 480 + + +def test_error_text() -> None: + c = AsyncClient() + assert c.error_text(0) == "OK" + assert "Not connected" in c.error_text(0x0003) + + +def test_set_clear_session_password() -> None: + c = AsyncClient() + assert c.session_password is None + c.set_session_password("secret") + assert c.session_password == "secret" + c.clear_session_password() + assert c.session_password is None + + +def test_set_connection_params() -> None: + c = AsyncClient() + c.set_connection_params("10.0.0.1", 0x0100, 0x0200) + assert c.host == "10.0.0.1" + assert c.local_tsap == 0x0100 + assert c.remote_tsap == 0x0200 + + +def test_set_connection_type() -> None: + c = AsyncClient() + c.set_connection_type(2) + assert c.connection_type == 2 + + +def test_get_set_param() -> None: + c = AsyncClient() + c.set_param(Parameter.PDURequest, 960) + assert c.get_param(Parameter.PDURequest) == 960 + assert c.pdu_length == 960 + + +def test_get_param_non_client_raises() -> None: + c = AsyncClient() + with pytest.raises(RuntimeError): + c.get_param(Parameter.LocalPort) + + +# ------------------------------------------------------------------- +# Block info / CPU info (against server) +# ------------------------------------------------------------------- + + +@pytest.mark.asyncio +async def test_list_blocks(client: AsyncClient) -> None: + result = await client.list_blocks() + assert hasattr(result, "DBCount") + + +@pytest.mark.asyncio +async def test_get_cpu_state(client: AsyncClient) -> None: + state = await client.get_cpu_state() + assert isinstance(state, str) + + +@pytest.mark.asyncio +async def test_get_cpu_info(client: AsyncClient) -> None: + info = await client.get_cpu_info() + assert hasattr(info, "ModuleTypeName") + + +@pytest.mark.asyncio +async def test_get_pdu_length_after_connect(client: AsyncClient) -> None: + assert client.get_pdu_length() > 0 diff --git a/uv.lock b/uv.lock index 40293986..e323d1c4 100644 --- a/uv.lock +++ b/uv.lock @@ -25,6 +25,15 @@ wheels = [ { url = "https://files.pythonhosted.org/packages/77/f5/21d2de20e8b8b0408f0681956ca2c69f1320a3848ac50e6e7f39c6159675/babel-2.18.0-py3-none-any.whl", hash = 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"https://files.pythonhosted.org/packages/e5/35/f8b19922b6a25bc0880171a2f1a003eaeb93657475193ab516fd87cac9da/pytest_asyncio-1.3.0-py3-none-any.whl", hash = "sha256:611e26147c7f77640e6d0a92a38ed17c3e9848063698d5c93d5aa7aa11cebff5", size = 15075, upload-time = "2025-11-10T16:07:45.537Z" }, +] + [[package]] name = "pytest-cov" version = "7.0.0" @@ -759,6 +782,7 @@ doc = [ test = [ { name = "mypy" }, { name = "pytest" }, + { name = "pytest-asyncio" }, { name = "pytest-cov" }, { name = "pytest-html" }, { name = "ruff" }, @@ -774,6 +798,7 @@ requires-dist = [ { name = "click", marker = "extra == 'cli'" }, { name = "mypy", marker = "extra == 'test'" }, { name = "pytest", marker = "extra == 'test'" }, + { name = "pytest-asyncio", marker = "extra == 'test'" }, { name = "pytest-cov", marker = "extra == 'test'" }, { name = "pytest-html", marker = "extra == 'test'" }, { name = "rich", marker = "extra == 'cli'" }, From d52b70babcf2aaf8bb2628e4f07291eeaf313838 Mon Sep 17 00:00:00 2001 From: Gijs Molenaar Date: Fri, 20 Mar 2026 12:38:22 +0200 Subject: [PATCH 12/19] Add S7CommPlus protocol scaffolding for S7-1200/1500 (#603) * Add S7CommPlus protocol scaffolding for S7-1200/1500 support Adds the snap7.s7commplus package as a foundation for future S7CommPlus protocol support, targeting all S7-1200/1500 PLCs (V1/V2/V3/TLS). Includes: - Protocol constants (opcodes, function codes, data types, element IDs) - VLQ encoding/decoding (Variable-Length Quantity, the S7CommPlus wire format) - Codec for frame headers, request/response headers, and typed values - Connection skeleton with multi-version support (V1/V2/V3/TLS) - Client stub with symbolic variable access API - 86 passing tests for VLQ and codec modules The wire protocol (VLQ, data types, object model) is the same across all protocol versions -- only the session authentication layer differs. The protocol version is auto-detected from the PLC's CreateObject response. Reference: thomas-v2/S7CommPlusDriver (C#, LGPL-3.0) Co-Authored-By: Claude Opus 4.6 * Add S7CommPlus server emulator, async client, and integration tests Server emulator (snap7/s7commplus/server.py): - Full PLC memory model with thread-safe data blocks - Named variable registration with type metadata - Handles CreateObject/DeleteObject session management - Handles Explore (browse registered DBs and variables) - Handles GetMultiVariables/SetMultiVariables (read/write) - Multi-client support (threaded) - CPU state management Async client (snap7/s7commplus/async_client.py): - asyncio-based S7CommPlus client with Lock for concurrent safety - Same API as sync client: db_read, db_write, db_read_multi, explore - Native COTP/TPKT transport using asyncio streams Updated sync client and connection to be functional for V1: - CreateObject/DeleteObject session lifecycle - Send/receive with S7CommPlus framing over COTP/TPKT - db_read, db_write, db_read_multi operations Integration tests (25 new tests): - Server unit tests (data blocks, variables, CPU state) - Sync client <-> server: connect, read, write, multi-read, explore - Async client <-> server: connect, read, write, concurrent reads - Data persistence across client sessions - Multiple concurrent clients with unique sessions Co-Authored-By: Claude Opus 4.6 * Clean up security-focused wording in S7CommPlus docstrings Reframe protocol version descriptions around interoperability rather than security vulnerabilities. Remove CVE references and replace implementation-specific language with neutral terminology. Co-Authored-By: Claude Opus 4.6 * Fix CI: remove pytest-asyncio dependency, fix formatting Rewrite async tests to use asyncio.run() instead of @pytest.mark.asyncio since pytest-asyncio is not a project dependency. Also apply ruff formatting fixes. Co-Authored-By: Claude Opus 4.6 * Add pytest-asyncio dependency and use native async tests Add pytest-asyncio to test dependencies and set asyncio_mode=auto. Restore async test methods with @pytest.mark.asyncio instead of asyncio.run() wrappers. Co-Authored-By: Claude Opus 4.6 * Fix CI and add S7CommPlus end-to-end tests Fix ruff formatting violations and mypy type errors in S7CommPlus code that caused pre-commit CI to fail. Add end-to-end test suite for validating S7CommPlus against a real S7-1200/1500 PLC. Co-Authored-By: Claude Opus 4.6 * Enhance S7CommPlus connection with variable-length TSAP support and async client improvements Support bytes-type remote TSAP (e.g. "SIMATIC-ROOT-HMI") in ISOTCPConnection, extend S7CommPlus protocol handling, and improve async client and server emulator. Co-Authored-By: Claude Opus 4.6 * Add extensive debug logging to S7CommPlus protocol stack for real PLC diagnostics Adds hex dumps and detailed parsing at every protocol layer (ISO-TCP, S7CommPlus connection, client) plus 6 new diagnostic e2e tests that probe different payload formats and function codes against real hardware. Co-Authored-By: Claude Opus 4.6 * Fix S7CommPlus wire format for real PLC compatibility Rewrite client payload encoding/decoding to use the correct S7CommPlus protocol format with ItemAddress structures (SymbolCrc, AccessArea, AccessSubArea, LIDs), ObjectQualifier, and proper PValue response parsing. Previously the client used a simplified custom format that only worked with the emulated server, causing ERROR2 responses from real S7-1200/1500 PLCs. - client.py: Correct GetMultiVariables/SetMultiVariables request format - async_client.py: Reuse corrected payload builders from client.py - codec.py: Add ItemAddress, ObjectQualifier, PValue encode/decode - protocol.py: Add Ids constants (DB_ACCESS_AREA_BASE, etc.) - server.py: Update to parse/generate the corrected wire format Co-Authored-By: Claude Opus 4.6 * Fix S7CommPlus LID byte offsets to use 1-based addressing S7CommPlus protocol uses 1-based LID byte offsets, but the client was sending 0-based offsets. This caused real PLCs to reject all db_read and db_write requests. Also fixes lint issues in e2e test file. Co-Authored-By: Claude Opus 4.6 * Add S7CommPlus session setup and legacy S7 fallback for data operations Implement the missing SetMultiVariables session handshake step that echoes ServerSessionVersion (attr 306) back to the PLC after CreateObject. Without this, PLCs reject data operations with ERROR2 (0x05A9). For PLCs that don't provide ServerSessionVersion or don't support S7CommPlus data operations, the client transparently falls back to the legacy S7 protocol. Co-Authored-By: Claude Opus 4.6 * Potential fix for code scanning alert no. 9: Binding a socket to all network interfaces Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com> --------- Co-authored-by: Claude Opus 4.6 Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com> --- pyproject.toml | 1 + snap7/connection.py | 22 +- snap7/s7commplus/__init__.py | 36 ++ snap7/s7commplus/async_client.py | 498 +++++++++++++++++ snap7/s7commplus/client.py | 510 +++++++++++++++++ snap7/s7commplus/codec.py | 495 +++++++++++++++++ snap7/s7commplus/connection.py | 743 +++++++++++++++++++++++++ snap7/s7commplus/protocol.py | 226 ++++++++ snap7/s7commplus/server.py | 902 +++++++++++++++++++++++++++++++ snap7/s7commplus/vlq.py | 338 ++++++++++++ tests/conftest.py | 10 +- tests/test_s7commplus_codec.py | 173 ++++++ tests/test_s7commplus_e2e.py | 607 +++++++++++++++++++++ tests/test_s7commplus_server.py | 304 +++++++++++ tests/test_s7commplus_vlq.py | 161 ++++++ uv.lock | 127 ++--- 16 files changed, 5072 insertions(+), 81 deletions(-) create mode 100644 snap7/s7commplus/__init__.py create mode 100644 snap7/s7commplus/async_client.py create mode 100644 snap7/s7commplus/client.py create mode 100644 snap7/s7commplus/codec.py create mode 100644 snap7/s7commplus/connection.py create mode 100644 snap7/s7commplus/protocol.py create mode 100644 snap7/s7commplus/server.py create mode 100644 snap7/s7commplus/vlq.py create mode 100644 tests/test_s7commplus_codec.py create mode 100644 tests/test_s7commplus_e2e.py create mode 100644 tests/test_s7commplus_server.py create mode 100644 tests/test_s7commplus_vlq.py diff --git a/pyproject.toml b/pyproject.toml index f040cc8d..2783274d 100644 --- a/pyproject.toml +++ b/pyproject.toml @@ -57,6 +57,7 @@ markers =[ "server", "util" ] +asyncio_mode = "auto" [tool.mypy] ignore_missing_imports = true diff --git a/snap7/connection.py b/snap7/connection.py index 6acee74f..466125ff 100644 --- a/snap7/connection.py +++ b/snap7/connection.py @@ -9,7 +9,7 @@ import struct import logging from enum import IntEnum -from typing import Optional, Type +from typing import Optional, Type, Union from types import TracebackType from .error import S7ConnectionError, S7TimeoutError @@ -66,7 +66,7 @@ def __init__( host: str, port: int = 102, local_tsap: int = 0x0100, - remote_tsap: int = 0x0102, + remote_tsap: Union[int, bytes] = 0x0102, tpdu_size: TPDUSize = TPDUSize.S_1024, ): """ @@ -76,7 +76,8 @@ def __init__( host: Target PLC IP address port: TCP port (default 102 for S7) local_tsap: Local Transport Service Access Point - remote_tsap: Remote Transport Service Access Point + remote_tsap: Remote Transport Service Access Point (int for 2-byte TSAP, + bytes for variable-length TSAP like b"SIMATIC-ROOT-HMI") tpdu_size: TPDU size to request during COTP negotiation """ self.host = host @@ -153,7 +154,7 @@ def send_data(self, data: bytes) -> None: # Send over TCP try: self.socket.sendall(tpkt_frame) - logger.debug(f"Sent {len(tpkt_frame)} bytes") + logger.debug(f"Sent {len(tpkt_frame)} bytes: {tpkt_frame.hex(' ')}") except socket.error as e: self.connected = False raise S7ConnectionError(f"Send failed: {e}") @@ -186,6 +187,7 @@ def receive_data(self) -> bytes: payload = self._recv_exact(remaining) # Parse COTP header and extract data + logger.debug(f"Received TPKT: version={version} length={length} payload ({len(payload)} bytes): {payload.hex(' ')}") return self._parse_cotp_data(payload) except socket.timeout: @@ -265,11 +267,13 @@ def _build_cotp_cr(self) -> bytes: ) # Add TSAP parameters - tsap_length = 2 # TSAP values are 2 bytes (unsigned short) - # Calling TSAP (local) - calling_tsap = struct.pack(">BBH", self.COTP_PARAM_CALLING_TSAP, tsap_length, self.local_tsap) - # Called TSAP (remote) - called_tsap = struct.pack(">BBH", self.COTP_PARAM_CALLED_TSAP, tsap_length, self.remote_tsap) + # Calling TSAP (local) - always 2 bytes + calling_tsap = struct.pack(">BBH", self.COTP_PARAM_CALLING_TSAP, 2, self.local_tsap) + # Called TSAP (remote) - can be 2-byte int or variable-length bytes (e.g. "SIMATIC-ROOT-HMI") + if isinstance(self.remote_tsap, bytes): + called_tsap = struct.pack(">BB", self.COTP_PARAM_CALLED_TSAP, len(self.remote_tsap)) + self.remote_tsap + else: + called_tsap = struct.pack(">BBH", self.COTP_PARAM_CALLED_TSAP, 2, self.remote_tsap) # PDU Size parameter (ISO 8073 code, e.g. 0x0A = 1024 bytes) pdu_size_param = struct.pack(">BBB", self.COTP_PARAM_PDU_SIZE, 1, self.tpdu_size) diff --git a/snap7/s7commplus/__init__.py b/snap7/s7commplus/__init__.py new file mode 100644 index 00000000..f8ff995a --- /dev/null +++ b/snap7/s7commplus/__init__.py @@ -0,0 +1,36 @@ +""" +S7CommPlus protocol implementation for S7-1200/1500 PLCs. + +S7CommPlus (protocol ID 0x72) is the successor to S7comm (protocol ID 0x32), +used by Siemens S7-1200 (firmware >= V4.0) and S7-1500 PLCs for full +engineering access (program download/upload, symbolic addressing, etc.). + +Supported PLC / firmware targets:: + + V1: S7-1200 FW V4.0+ (simple session handshake) + V2: S7-1200/1500 older FW (session authentication) + V3: S7-1200/1500 pre-TIA V17 (public-key key exchange) + V3 + TLS: TIA Portal V17+ (TLS 1.3 with per-device certs) + +Protocol stack:: + + +-------------------------------+ + | S7CommPlus (Protocol ID 0x72)| + +-------------------------------+ + | TLS 1.3 (optional, V17+) | + +-------------------------------+ + | COTP (ISO 8073) | + +-------------------------------+ + | TPKT (RFC 1006) | + +-------------------------------+ + | TCP (port 102) | + +-------------------------------+ + +The wire protocol (VLQ encoding, data types, function codes, object model) +is the same across all versions -- only the session authentication differs. + +Status: experimental scaffolding -- not yet functional. + +Reference implementation: + https://github.com/thomas-v2/S7CommPlusDriver (C#, LGPL-3.0) +""" diff --git a/snap7/s7commplus/async_client.py b/snap7/s7commplus/async_client.py new file mode 100644 index 00000000..f7c77995 --- /dev/null +++ b/snap7/s7commplus/async_client.py @@ -0,0 +1,498 @@ +""" +Async S7CommPlus client for S7-1200/1500 PLCs. + +Provides the same API as S7CommPlusClient but using asyncio for +non-blocking I/O. Uses asyncio.Lock for concurrent safety. + +When a PLC does not support S7CommPlus data operations, the client +transparently falls back to the legacy S7 protocol for data block +read/write operations (using synchronous calls in an executor). + +Example:: + + async with S7CommPlusAsyncClient() as client: + await client.connect("192.168.1.10") + data = await client.db_read(1, 0, 4) + await client.db_write(1, 0, struct.pack(">f", 23.5)) +""" + +import asyncio +import logging +import struct +from typing import Any, Optional + +from .protocol import ( + DataType, + ElementID, + FunctionCode, + ObjectId, + Opcode, + ProtocolVersion, + S7COMMPLUS_LOCAL_TSAP, + S7COMMPLUS_REMOTE_TSAP, +) +from .codec import encode_header, decode_header, encode_typed_value, encode_object_qualifier +from .vlq import encode_uint32_vlq, decode_uint64_vlq +from .client import _build_read_payload, _parse_read_response, _build_write_payload, _parse_write_response + +logger = logging.getLogger(__name__) + +# COTP constants +_COTP_CR = 0xE0 +_COTP_CC = 0xD0 +_COTP_DT = 0xF0 + + +class S7CommPlusAsyncClient: + """Async S7CommPlus client for S7-1200/1500 PLCs. + + Supports V1 protocol. V2/V3/TLS planned for future. + + Uses asyncio for all I/O operations and asyncio.Lock for + concurrent safety when shared between multiple coroutines. + + When the PLC does not support S7CommPlus data operations, the client + automatically falls back to legacy S7 protocol for db_read/db_write. + """ + + def __init__(self) -> None: + self._reader: Optional[asyncio.StreamReader] = None + self._writer: Optional[asyncio.StreamWriter] = None + self._session_id: int = 0 + self._sequence_number: int = 0 + self._protocol_version: int = 0 + self._connected = False + self._lock = asyncio.Lock() + self._legacy_client: Optional[Any] = None + self._use_legacy_data: bool = False + self._host: str = "" + self._port: int = 102 + self._rack: int = 0 + self._slot: int = 1 + + @property + def connected(self) -> bool: + if self._use_legacy_data and self._legacy_client is not None: + return bool(self._legacy_client.connected) + return self._connected + + @property + def protocol_version(self) -> int: + return self._protocol_version + + @property + def session_id(self) -> int: + return self._session_id + + @property + def using_legacy_fallback(self) -> bool: + """Whether the client is using legacy S7 protocol for data operations.""" + return self._use_legacy_data + + async def connect( + self, + host: str, + port: int = 102, + rack: int = 0, + slot: int = 1, + ) -> None: + """Connect to an S7-1200/1500 PLC. + + If the PLC does not support S7CommPlus data operations, a secondary + legacy S7 connection is established transparently for data access. + + Args: + host: PLC IP address or hostname + port: TCP port (default 102) + rack: PLC rack number + slot: PLC slot number + """ + self._host = host + self._port = port + self._rack = rack + self._slot = slot + + # TCP connect + self._reader, self._writer = await asyncio.open_connection(host, port) + + try: + # COTP handshake with S7CommPlus TSAP values + await self._cotp_connect(S7COMMPLUS_LOCAL_TSAP, S7COMMPLUS_REMOTE_TSAP) + + # InitSSL handshake + await self._init_ssl() + + # S7CommPlus session setup + await self._create_session() + + self._connected = True + logger.info( + f"Async S7CommPlus connected to {host}:{port}, version=V{self._protocol_version}, session={self._session_id}" + ) + + # Probe S7CommPlus data operations + if not await self._probe_s7commplus_data(): + logger.info("S7CommPlus data operations not supported, falling back to legacy S7 protocol") + await self._setup_legacy_fallback() + + except Exception: + await self.disconnect() + raise + + async def _probe_s7commplus_data(self) -> bool: + """Test if the PLC supports S7CommPlus data operations.""" + try: + payload = struct.pack(">I", 0) + encode_uint32_vlq(0) + encode_uint32_vlq(0) + payload += encode_object_qualifier() + payload += struct.pack(">I", 0) + + response = await self._send_request(FunctionCode.GET_MULTI_VARIABLES, payload) + if len(response) < 1: + return False + return_value, _ = decode_uint64_vlq(response, 0) + if return_value != 0: + logger.debug(f"S7CommPlus probe: PLC returned error {return_value}") + return False + return True + except Exception as e: + logger.debug(f"S7CommPlus probe failed: {e}") + return False + + async def _setup_legacy_fallback(self) -> None: + """Establish a secondary legacy S7 connection for data operations.""" + from ..client import Client + + loop = asyncio.get_event_loop() + client = Client() + await loop.run_in_executor(None, lambda: client.connect(self._host, self._rack, self._slot, self._port)) + self._legacy_client = client + self._use_legacy_data = True + logger.info(f"Legacy S7 fallback connected to {self._host}:{self._port}") + + async def disconnect(self) -> None: + """Disconnect from PLC.""" + if self._legacy_client is not None: + try: + self._legacy_client.disconnect() + except Exception: + pass + self._legacy_client = None + self._use_legacy_data = False + + if self._connected and self._session_id: + try: + await self._delete_session() + except Exception: + pass + + self._connected = False + self._session_id = 0 + self._sequence_number = 0 + self._protocol_version = 0 + + if self._writer: + try: + self._writer.close() + await self._writer.wait_closed() + except Exception: + pass + self._writer = None + self._reader = None + + async def db_read(self, db_number: int, start: int, size: int) -> bytes: + """Read raw bytes from a data block. + + Args: + db_number: Data block number + start: Start byte offset + size: Number of bytes to read + + Returns: + Raw bytes read from the data block + """ + if self._use_legacy_data and self._legacy_client is not None: + client = self._legacy_client + loop = asyncio.get_event_loop() + data = await loop.run_in_executor(None, lambda: client.db_read(db_number, start, size)) + return bytes(data) + + payload = _build_read_payload([(db_number, start, size)]) + response = await self._send_request(FunctionCode.GET_MULTI_VARIABLES, payload) + + results = _parse_read_response(response) + if not results: + raise RuntimeError("Read returned no data") + if results[0] is None: + raise RuntimeError("Read failed: PLC returned error for item") + return results[0] + + async def db_write(self, db_number: int, start: int, data: bytes) -> None: + """Write raw bytes to a data block. + + Args: + db_number: Data block number + start: Start byte offset + data: Bytes to write + """ + if self._use_legacy_data and self._legacy_client is not None: + client = self._legacy_client + loop = asyncio.get_event_loop() + await loop.run_in_executor(None, lambda: client.db_write(db_number, start, bytearray(data))) + return + + payload = _build_write_payload([(db_number, start, data)]) + response = await self._send_request(FunctionCode.SET_MULTI_VARIABLES, payload) + _parse_write_response(response) + + async def db_read_multi(self, items: list[tuple[int, int, int]]) -> list[bytes]: + """Read multiple data block regions in a single request. + + Args: + items: List of (db_number, start_offset, size) tuples + + Returns: + List of raw bytes for each item + """ + if self._use_legacy_data and self._legacy_client is not None: + client = self._legacy_client + loop = asyncio.get_event_loop() + multi_results: list[bytes] = [] + for db_number, start, size in items: + + def _read(db: int = db_number, s: int = start, sz: int = size) -> bytearray: + return bytearray(client.db_read(db, s, sz)) + + data = await loop.run_in_executor(None, _read) + multi_results.append(bytes(data)) + return multi_results + + payload = _build_read_payload(items) + response = await self._send_request(FunctionCode.GET_MULTI_VARIABLES, payload) + + parsed = _parse_read_response(response) + return [r if r is not None else b"" for r in parsed] + + async def explore(self) -> bytes: + """Browse the PLC object tree. + + Returns: + Raw response payload + """ + return await self._send_request(FunctionCode.EXPLORE, b"") + + # -- Internal methods -- + + async def _send_request(self, function_code: int, payload: bytes) -> bytes: + """Send an S7CommPlus request and receive the response.""" + async with self._lock: + if not self._connected or self._writer is None or self._reader is None: + raise RuntimeError("Not connected") + + seq_num = self._next_sequence_number() + + request = ( + struct.pack( + ">BHHHHIB", + Opcode.REQUEST, + 0x0000, + function_code, + 0x0000, + seq_num, + self._session_id, + 0x36, + ) + + payload + ) + + frame = encode_header(self._protocol_version, len(request)) + request + frame += struct.pack(">BBH", 0x72, self._protocol_version, 0x0000) + await self._send_cotp_dt(frame) + + response_data = await self._recv_cotp_dt() + + version, data_length, consumed = decode_header(response_data) + response = response_data[consumed : consumed + data_length] + + if len(response) < 14: + raise RuntimeError("Response too short") + + return response[14:] + + async def _cotp_connect(self, local_tsap: int, remote_tsap: bytes) -> None: + """Perform COTP Connection Request / Confirm handshake.""" + if self._writer is None or self._reader is None: + raise RuntimeError("Not connected") + + # Build COTP CR + base_pdu = struct.pack(">BBHHB", 6, _COTP_CR, 0x0000, 0x0001, 0x00) + calling_tsap = struct.pack(">BBH", 0xC1, 2, local_tsap) + called_tsap = struct.pack(">BB", 0xC2, len(remote_tsap)) + remote_tsap + pdu_size_param = struct.pack(">BBB", 0xC0, 1, 0x0A) + + params = calling_tsap + called_tsap + pdu_size_param + cr_pdu = struct.pack(">B", 6 + len(params)) + base_pdu[1:] + params + + # Send TPKT + CR + tpkt = struct.pack(">BBH", 3, 0, 4 + len(cr_pdu)) + cr_pdu + self._writer.write(tpkt) + await self._writer.drain() + + # Receive TPKT + CC + tpkt_header = await self._reader.readexactly(4) + _, _, length = struct.unpack(">BBH", tpkt_header) + payload = await self._reader.readexactly(length - 4) + + if len(payload) < 7 or payload[1] != _COTP_CC: + raise RuntimeError(f"Expected COTP CC, got {payload[1]:#04x}") + + async def _init_ssl(self) -> None: + """Send InitSSL request (required before CreateObject).""" + seq_num = self._next_sequence_number() + + request = struct.pack( + ">BHHHHIB", + Opcode.REQUEST, + 0x0000, + FunctionCode.INIT_SSL, + 0x0000, + seq_num, + 0x00000000, + 0x30, # Transport flags for InitSSL + ) + request += struct.pack(">I", 0) + + frame = encode_header(ProtocolVersion.V1, len(request)) + request + frame += struct.pack(">BBH", 0x72, ProtocolVersion.V1, 0x0000) + await self._send_cotp_dt(frame) + + response_data = await self._recv_cotp_dt() + version, data_length, consumed = decode_header(response_data) + response = response_data[consumed : consumed + data_length] + + if len(response) < 14: + raise RuntimeError("InitSSL response too short") + + logger.debug(f"InitSSL response received, version=V{version}") + + async def _create_session(self) -> None: + """Send CreateObject to establish S7CommPlus session.""" + seq_num = self._next_sequence_number() + + # Build CreateObject request header + request = struct.pack( + ">BHHHHIB", + Opcode.REQUEST, + 0x0000, + FunctionCode.CREATE_OBJECT, + 0x0000, + seq_num, + ObjectId.OBJECT_NULL_SERVER_SESSION, # SessionId = 288 + 0x36, + ) + + # RequestId: ObjectServerSessionContainer (285) + request += struct.pack(">I", ObjectId.OBJECT_SERVER_SESSION_CONTAINER) + + # RequestValue: ValueUDInt(0) + request += bytes([0x00, DataType.UDINT]) + encode_uint32_vlq(0) + + # Unknown padding + request += struct.pack(">I", 0) + + # RequestObject: NullServerSession PObject + request += bytes([ElementID.START_OF_OBJECT]) + request += struct.pack(">I", ObjectId.GET_NEW_RID_ON_SERVER) + request += encode_uint32_vlq(ObjectId.CLASS_SERVER_SESSION) + request += encode_uint32_vlq(0) # ClassFlags + request += encode_uint32_vlq(0) # AttributeId + + # Attribute: ServerSessionClientRID = 0x80c3c901 + request += bytes([ElementID.ATTRIBUTE]) + request += encode_uint32_vlq(ObjectId.SERVER_SESSION_CLIENT_RID) + request += encode_typed_value(DataType.RID, 0x80C3C901) + + # Nested: ClassSubscriptions + request += bytes([ElementID.START_OF_OBJECT]) + request += struct.pack(">I", ObjectId.GET_NEW_RID_ON_SERVER) + request += encode_uint32_vlq(ObjectId.CLASS_SUBSCRIPTIONS) + request += encode_uint32_vlq(0) + request += encode_uint32_vlq(0) + request += bytes([ElementID.TERMINATING_OBJECT]) + + request += bytes([ElementID.TERMINATING_OBJECT]) + request += struct.pack(">I", 0) + + # Frame header + trailer + frame = encode_header(ProtocolVersion.V1, len(request)) + request + frame += struct.pack(">BBH", 0x72, ProtocolVersion.V1, 0x0000) + await self._send_cotp_dt(frame) + + response_data = await self._recv_cotp_dt() + version, data_length, consumed = decode_header(response_data) + response = response_data[consumed : consumed + data_length] + + if len(response) < 14: + raise RuntimeError("CreateObject response too short") + + self._session_id = struct.unpack_from(">I", response, 9)[0] + self._protocol_version = version + + async def _delete_session(self) -> None: + """Send DeleteObject to close the session.""" + seq_num = self._next_sequence_number() + + request = struct.pack( + ">BHHHHIB", + Opcode.REQUEST, + 0x0000, + FunctionCode.DELETE_OBJECT, + 0x0000, + seq_num, + self._session_id, + 0x36, + ) + request += struct.pack(">I", 0) + + frame = encode_header(self._protocol_version, len(request)) + request + frame += struct.pack(">BBH", 0x72, self._protocol_version, 0x0000) + await self._send_cotp_dt(frame) + + try: + await asyncio.wait_for(self._recv_cotp_dt(), timeout=1.0) + except Exception: + pass + + async def _send_cotp_dt(self, data: bytes) -> None: + """Send data wrapped in COTP DT + TPKT.""" + if self._writer is None: + raise RuntimeError("Not connected") + + cotp_dt = struct.pack(">BBB", 2, _COTP_DT, 0x80) + data + tpkt = struct.pack(">BBH", 3, 0, 4 + len(cotp_dt)) + cotp_dt + self._writer.write(tpkt) + await self._writer.drain() + + async def _recv_cotp_dt(self) -> bytes: + """Receive TPKT + COTP DT and return the payload.""" + if self._reader is None: + raise RuntimeError("Not connected") + + tpkt_header = await self._reader.readexactly(4) + _, _, length = struct.unpack(">BBH", tpkt_header) + payload = await self._reader.readexactly(length - 4) + + if len(payload) < 3 or payload[1] != _COTP_DT: + raise RuntimeError(f"Expected COTP DT, got {payload[1]:#04x}") + + return payload[3:] + + def _next_sequence_number(self) -> int: + seq = self._sequence_number + self._sequence_number = (self._sequence_number + 1) & 0xFFFF + return seq + + async def __aenter__(self) -> "S7CommPlusAsyncClient": + return self + + async def __aexit__(self, *args: Any) -> None: + await self.disconnect() diff --git a/snap7/s7commplus/client.py b/snap7/s7commplus/client.py new file mode 100644 index 00000000..d5b38a40 --- /dev/null +++ b/snap7/s7commplus/client.py @@ -0,0 +1,510 @@ +""" +S7CommPlus client for S7-1200/1500 PLCs. + +Provides high-level operations over the S7CommPlus protocol, similar to +the existing snap7.Client but targeting S7-1200/1500 PLCs with full +engineering access (symbolic addressing, optimized data blocks, etc.). + +Supports all S7CommPlus protocol versions (V1/V2/V3/TLS). The protocol +version is auto-detected from the PLC's CreateObject response during +connection setup. + +When a PLC does not support S7CommPlus data operations (e.g. PLCs that +accept S7CommPlus sessions but return ERROR2 for GetMultiVariables), +the client transparently falls back to the legacy S7 protocol for +data block read/write operations. + +Status: V1 connection is functional. V2/V3/TLS authentication planned. + +Reference: thomas-v2/S7CommPlusDriver (C#, LGPL-3.0) +""" + +import logging +import struct +from typing import Any, Optional + +from .connection import S7CommPlusConnection +from .protocol import FunctionCode, Ids +from .vlq import encode_uint32_vlq, decode_uint32_vlq, decode_uint64_vlq +from .codec import ( + encode_item_address, + encode_object_qualifier, + encode_pvalue_blob, + decode_pvalue_to_bytes, +) + +logger = logging.getLogger(__name__) + + +class S7CommPlusClient: + """S7CommPlus client for S7-1200/1500 PLCs. + + Supports all S7CommPlus protocol versions: + - V1: S7-1200 FW V4.0+ + - V2: S7-1200/1500 with older firmware + - V3: S7-1200/1500 pre-TIA Portal V17 + - V3 + TLS: TIA Portal V17+ (recommended) + + The protocol version is auto-detected during connection. + + When the PLC does not support S7CommPlus data operations, the client + automatically falls back to legacy S7 protocol for db_read/db_write. + + Example:: + + client = S7CommPlusClient() + client.connect("192.168.1.10") + + # Read raw bytes from DB1 + data = client.db_read(1, 0, 4) + + # Write raw bytes to DB1 + client.db_write(1, 0, struct.pack(">f", 23.5)) + + client.disconnect() + """ + + def __init__(self) -> None: + self._connection: Optional[S7CommPlusConnection] = None + self._legacy_client: Optional[Any] = None + self._use_legacy_data: bool = False + self._host: str = "" + self._port: int = 102 + self._rack: int = 0 + self._slot: int = 1 + + @property + def connected(self) -> bool: + if self._use_legacy_data and self._legacy_client is not None: + return bool(self._legacy_client.connected) + return self._connection is not None and self._connection.connected + + @property + def protocol_version(self) -> int: + """Protocol version negotiated with the PLC.""" + if self._connection is None: + return 0 + return self._connection.protocol_version + + @property + def session_id(self) -> int: + """Session ID assigned by the PLC.""" + if self._connection is None: + return 0 + return self._connection.session_id + + @property + def using_legacy_fallback(self) -> bool: + """Whether the client is using legacy S7 protocol for data operations.""" + return self._use_legacy_data + + def connect( + self, + host: str, + port: int = 102, + rack: int = 0, + slot: int = 1, + use_tls: bool = False, + tls_cert: Optional[str] = None, + tls_key: Optional[str] = None, + tls_ca: Optional[str] = None, + ) -> None: + """Connect to an S7-1200/1500 PLC using S7CommPlus. + + If the PLC does not support S7CommPlus data operations, a secondary + legacy S7 connection is established transparently for data access. + + Args: + host: PLC IP address or hostname + port: TCP port (default 102) + rack: PLC rack number + slot: PLC slot number + use_tls: Whether to attempt TLS (requires V3 PLC + certs) + tls_cert: Path to client TLS certificate (PEM) + tls_key: Path to client private key (PEM) + tls_ca: Path to CA certificate for PLC verification (PEM) + """ + self._host = host + self._port = port + self._rack = rack + self._slot = slot + + self._connection = S7CommPlusConnection( + host=host, + port=port, + ) + + self._connection.connect( + use_tls=use_tls, + tls_cert=tls_cert, + tls_key=tls_key, + tls_ca=tls_ca, + ) + + # Probe S7CommPlus data operations with a minimal request + if not self._probe_s7commplus_data(): + logger.info("S7CommPlus data operations not supported, falling back to legacy S7 protocol") + self._setup_legacy_fallback() + + def _probe_s7commplus_data(self) -> bool: + """Test if the PLC supports S7CommPlus data operations. + + Sends a minimal GetMultiVariables request with zero items. If the PLC + responds with ERROR2 or a non-zero return code, data operations are + not supported. + + Returns: + True if S7CommPlus data operations work. + """ + if self._connection is None: + return False + + try: + # Send a minimal GetMultiVariables with 0 items + payload = struct.pack(">I", 0) + encode_uint32_vlq(0) + encode_uint32_vlq(0) + payload += encode_object_qualifier() + payload += struct.pack(">I", 0) + + response = self._connection.send_request(FunctionCode.GET_MULTI_VARIABLES, payload) + + # Check if we got a valid response (return value = 0) + if len(response) < 1: + return False + return_value, _ = decode_uint64_vlq(response, 0) + if return_value != 0: + logger.debug(f"S7CommPlus probe: PLC returned error {return_value}") + return False + return True + except Exception as e: + logger.debug(f"S7CommPlus probe failed: {e}") + return False + + def _setup_legacy_fallback(self) -> None: + """Establish a secondary legacy S7 connection for data operations.""" + from ..client import Client + + self._legacy_client = Client() + self._legacy_client.connect(self._host, self._rack, self._slot, self._port) + self._use_legacy_data = True + logger.info(f"Legacy S7 fallback connected to {self._host}:{self._port}") + + def disconnect(self) -> None: + """Disconnect from PLC.""" + if self._legacy_client is not None: + try: + self._legacy_client.disconnect() + except Exception: + pass + self._legacy_client = None + self._use_legacy_data = False + + if self._connection: + self._connection.disconnect() + self._connection = None + + # -- Data block read/write -- + + def db_read(self, db_number: int, start: int, size: int) -> bytes: + """Read raw bytes from a data block. + + Uses S7CommPlus protocol when supported, otherwise falls back to + legacy S7 protocol transparently. + + Args: + db_number: Data block number + start: Start byte offset + size: Number of bytes to read + + Returns: + Raw bytes read from the data block + """ + if self._use_legacy_data and self._legacy_client is not None: + return bytes(self._legacy_client.db_read(db_number, start, size)) + + if self._connection is None: + raise RuntimeError("Not connected") + + payload = _build_read_payload([(db_number, start, size)]) + logger.debug(f"db_read: db={db_number} start={start} size={size} payload={payload.hex(' ')}") + + response = self._connection.send_request(FunctionCode.GET_MULTI_VARIABLES, payload) + logger.debug(f"db_read: response ({len(response)} bytes): {response.hex(' ')}") + + results = _parse_read_response(response) + if not results: + raise RuntimeError("Read returned no data") + if results[0] is None: + raise RuntimeError("Read failed: PLC returned error for item") + return results[0] + + def db_write(self, db_number: int, start: int, data: bytes) -> None: + """Write raw bytes to a data block. + + Uses S7CommPlus protocol when supported, otherwise falls back to + legacy S7 protocol transparently. + + Args: + db_number: Data block number + start: Start byte offset + data: Bytes to write + """ + if self._use_legacy_data and self._legacy_client is not None: + self._legacy_client.db_write(db_number, start, bytearray(data)) + return + + if self._connection is None: + raise RuntimeError("Not connected") + + payload = _build_write_payload([(db_number, start, data)]) + logger.debug( + f"db_write: db={db_number} start={start} data_len={len(data)} data={data.hex(' ')} payload={payload.hex(' ')}" + ) + + response = self._connection.send_request(FunctionCode.SET_MULTI_VARIABLES, payload) + logger.debug(f"db_write: response ({len(response)} bytes): {response.hex(' ')}") + + _parse_write_response(response) + + def db_read_multi(self, items: list[tuple[int, int, int]]) -> list[bytes]: + """Read multiple data block regions in a single request. + + Uses S7CommPlus protocol when supported, otherwise falls back to + legacy S7 protocol (individual reads) transparently. + + Args: + items: List of (db_number, start_offset, size) tuples + + Returns: + List of raw bytes for each item + """ + if self._use_legacy_data and self._legacy_client is not None: + results = [] + for db_number, start, size in items: + data = self._legacy_client.db_read(db_number, start, size) + results.append(bytes(data)) + return results + + if self._connection is None: + raise RuntimeError("Not connected") + + payload = _build_read_payload(items) + logger.debug(f"db_read_multi: {len(items)} items: {items} payload={payload.hex(' ')}") + + response = self._connection.send_request(FunctionCode.GET_MULTI_VARIABLES, payload) + logger.debug(f"db_read_multi: response ({len(response)} bytes): {response.hex(' ')}") + + parsed = _parse_read_response(response) + return [r if r is not None else b"" for r in parsed] + + # -- Explore (browse PLC object tree) -- + + def explore(self) -> bytes: + """Browse the PLC object tree. + + Returns the raw Explore response payload for parsing. + Full symbolic exploration will be implemented in a future version. + + Returns: + Raw response payload + """ + if self._connection is None: + raise RuntimeError("Not connected") + + response = self._connection.send_request(FunctionCode.EXPLORE, b"") + logger.debug(f"explore: response ({len(response)} bytes): {response.hex(' ')}") + return response + + # -- Context manager -- + + def __enter__(self) -> "S7CommPlusClient": + return self + + def __exit__(self, *args: Any) -> None: + self.disconnect() + + +# -- Request/response builders (module-level for reuse by async client) -- + + +def _build_read_payload(items: list[tuple[int, int, int]]) -> bytes: + """Build a GetMultiVariables request payload. + + Args: + items: List of (db_number, start_offset, size) tuples + + Returns: + Encoded payload bytes (after the 14-byte request header) + + Reference: thomas-v2/S7CommPlusDriver/Core/GetMultiVariablesRequest.cs + """ + # Encode all item addresses and compute total field count + addresses: list[bytes] = [] + total_field_count = 0 + for db_number, start, size in items: + access_area = Ids.DB_ACCESS_AREA_BASE + (db_number & 0xFFFF) + addr_bytes, field_count = encode_item_address( + access_area=access_area, + access_sub_area=Ids.DB_VALUE_ACTUAL, + lids=[start + 1, size], # LID byte offsets are 1-based in S7CommPlus + ) + addresses.append(addr_bytes) + total_field_count += field_count + + payload = bytearray() + # LinkId (UInt32 fixed = 0, for reading variables) + payload += struct.pack(">I", 0) + # Item count + payload += encode_uint32_vlq(len(items)) + # Total field count across all items + payload += encode_uint32_vlq(total_field_count) + # Item addresses + for addr in addresses: + payload += addr + # ObjectQualifier + payload += encode_object_qualifier() + # Padding + payload += struct.pack(">I", 0) + + return bytes(payload) + + +def _parse_read_response(response: bytes) -> list[Optional[bytes]]: + """Parse a GetMultiVariables response payload. + + Args: + response: Response payload (after the 14-byte response header) + + Returns: + List of raw bytes per item (None for errored items) + + Reference: thomas-v2/S7CommPlusDriver/Core/GetMultiVariablesResponse.cs + """ + offset = 0 + + # ReturnValue (UInt64 VLQ) + return_value, consumed = decode_uint64_vlq(response, offset) + offset += consumed + logger.debug(f"_parse_read_response: return_value={return_value}") + + if return_value != 0: + logger.error(f"_parse_read_response: PLC returned error: {return_value}") + return [] + + # Value list: ItemNumber (VLQ) + PValue, terminated by ItemNumber=0 + values: dict[int, bytes] = {} + while offset < len(response): + item_nr, consumed = decode_uint32_vlq(response, offset) + offset += consumed + if item_nr == 0: + break + raw_bytes, consumed = decode_pvalue_to_bytes(response, offset) + offset += consumed + values[item_nr] = raw_bytes + + # Error list: ErrorItemNumber (VLQ) + ErrorReturnValue (UInt64 VLQ), terminated by 0 + errors: dict[int, int] = {} + while offset < len(response): + err_item_nr, consumed = decode_uint32_vlq(response, offset) + offset += consumed + if err_item_nr == 0: + break + err_value, consumed = decode_uint64_vlq(response, offset) + offset += consumed + errors[err_item_nr] = err_value + logger.debug(f"_parse_read_response: error item {err_item_nr}: {err_value}") + + # Build result list (1-based item numbers) + max_item = max(max(values.keys(), default=0), max(errors.keys(), default=0)) + results: list[Optional[bytes]] = [] + for i in range(1, max_item + 1): + if i in values: + results.append(values[i]) + else: + results.append(None) + + return results + + +def _build_write_payload(items: list[tuple[int, int, bytes]]) -> bytes: + """Build a SetMultiVariables request payload. + + Args: + items: List of (db_number, start_offset, data) tuples + + Returns: + Encoded payload bytes + + Reference: thomas-v2/S7CommPlusDriver/Core/SetMultiVariablesRequest.cs + """ + # Encode all item addresses and compute total field count + addresses: list[bytes] = [] + total_field_count = 0 + for db_number, start, data in items: + access_area = Ids.DB_ACCESS_AREA_BASE + (db_number & 0xFFFF) + addr_bytes, field_count = encode_item_address( + access_area=access_area, + access_sub_area=Ids.DB_VALUE_ACTUAL, + lids=[start + 1, len(data)], # LID byte offsets are 1-based in S7CommPlus + ) + addresses.append(addr_bytes) + total_field_count += field_count + + payload = bytearray() + # InObjectId (UInt32 fixed = 0, for plain variable writes) + payload += struct.pack(">I", 0) + # Item count + payload += encode_uint32_vlq(len(items)) + # Total field count + payload += encode_uint32_vlq(total_field_count) + # Item addresses + for addr in addresses: + payload += addr + # Value list: ItemNumber (1-based) + PValue + for i, (_, _, data) in enumerate(items, 1): + payload += encode_uint32_vlq(i) + payload += encode_pvalue_blob(data) + # Fill byte + payload += bytes([0x00]) + # ObjectQualifier + payload += encode_object_qualifier() + # Padding + payload += struct.pack(">I", 0) + + return bytes(payload) + + +def _parse_write_response(response: bytes) -> None: + """Parse a SetMultiVariables response payload. + + Args: + response: Response payload (after the 14-byte response header) + + Raises: + RuntimeError: If the write failed + + Reference: thomas-v2/S7CommPlusDriver/Core/SetMultiVariablesResponse.cs + """ + offset = 0 + + # ReturnValue (UInt64 VLQ) + return_value, consumed = decode_uint64_vlq(response, offset) + offset += consumed + logger.debug(f"_parse_write_response: return_value={return_value}") + + if return_value != 0: + raise RuntimeError(f"Write failed with return value {return_value}") + + # Error list: ErrorItemNumber (VLQ) + ErrorReturnValue (UInt64 VLQ) + errors: list[tuple[int, int]] = [] + while offset < len(response): + err_item_nr, consumed = decode_uint32_vlq(response, offset) + offset += consumed + if err_item_nr == 0: + break + err_value, consumed = decode_uint64_vlq(response, offset) + offset += consumed + errors.append((err_item_nr, err_value)) + + if errors: + err_str = ", ".join(f"item {nr}: error {val}" for nr, val in errors) + raise RuntimeError(f"Write failed: {err_str}") diff --git a/snap7/s7commplus/codec.py b/snap7/s7commplus/codec.py new file mode 100644 index 00000000..74f94a2e --- /dev/null +++ b/snap7/s7commplus/codec.py @@ -0,0 +1,495 @@ +""" +S7CommPlus data encoding and decoding. + +Provides serialization for the S7CommPlus wire format including: +- Fixed-width integers (big-endian) +- VLQ-encoded integers +- Floating point values +- Strings (UTF-8 encoded WStrings) +- Blobs (raw byte arrays) +- S7CommPlus frame header + +Reference: thomas-v2/S7CommPlusDriver/Core/S7p.cs +""" + +import struct +from typing import Any + +from .protocol import PROTOCOL_ID, DataType, Ids +from .vlq import ( + encode_uint32_vlq, + decode_uint32_vlq, + encode_int32_vlq, + encode_uint64_vlq, + decode_uint64_vlq, + encode_int64_vlq, +) + + +def encode_header(version: int, data_length: int) -> bytes: + """Encode an S7CommPlus frame header. + + Header format (4 bytes):: + + [0] Protocol ID: 0x72 + [1] Protocol version + [2-3] Data length (big-endian uint16) + + Args: + version: Protocol version byte + data_length: Length of data following the header + + Returns: + 4-byte header + """ + return struct.pack(">BBH", PROTOCOL_ID, version, data_length) + + +def decode_header(data: bytes, offset: int = 0) -> tuple[int, int, int]: + """Decode an S7CommPlus frame header. + + Args: + data: Buffer containing the header + offset: Starting position + + Returns: + Tuple of (protocol_version, data_length, bytes_consumed) + + Raises: + ValueError: If protocol ID is not 0x72 + """ + if len(data) - offset < 4: + raise ValueError("Not enough data for S7CommPlus header") + + proto_id, version, length = struct.unpack_from(">BBH", data, offset) + + if proto_id != PROTOCOL_ID: + raise ValueError(f"Invalid protocol ID: {proto_id:#04x}, expected {PROTOCOL_ID:#04x}") + + return version, length, 4 + + +def encode_request_header( + function_code: int, + sequence_number: int, + session_id: int = 0, + transport_flags: int = 0x36, +) -> bytes: + """Encode an S7CommPlus request header (after the frame header). + + Request header format:: + + [0] Opcode: 0x31 (Request) + [1-2] Reserved: 0x0000 + [3-4] Function code (big-endian uint16) + [5-6] Reserved: 0x0000 + [7-8] Sequence number (big-endian uint16) + [9-12] Session ID (big-endian uint32) + [13] Transport flags + + Args: + function_code: S7CommPlus function code + sequence_number: Request sequence number + session_id: Session identifier (0 for initial connection) + transport_flags: Transport flags byte + + Returns: + 14-byte request header + """ + from .protocol import Opcode + + return struct.pack( + ">BHHHHIB", + Opcode.REQUEST, + 0x0000, # Reserved + function_code, + 0x0000, # Reserved + sequence_number, + session_id, + transport_flags, + ) + + +def decode_response_header(data: bytes, offset: int = 0) -> dict[str, Any]: + """Decode an S7CommPlus response header. + + Args: + data: Buffer containing the response + offset: Starting position + + Returns: + Dictionary with opcode, function_code, sequence_number, session_id, + transport_flags, and bytes_consumed + """ + if len(data) - offset < 14: + raise ValueError("Not enough data for S7CommPlus response header") + + opcode, reserved1, function_code, reserved2, seq_num, session_id, transport_flags = struct.unpack_from( + ">BHHHHIB", data, offset + ) + + return { + "opcode": opcode, + "function_code": function_code, + "sequence_number": seq_num, + "session_id": session_id, + "transport_flags": transport_flags, + "bytes_consumed": 14, + } + + +# -- Fixed-width encoding (big-endian) -- + + +def encode_uint8(value: int) -> bytes: + return struct.pack(">B", value) + + +def decode_uint8(data: bytes, offset: int = 0) -> tuple[int, int]: + return struct.unpack_from(">B", data, offset)[0], 1 + + +def encode_uint16(value: int) -> bytes: + return struct.pack(">H", value) + + +def decode_uint16(data: bytes, offset: int = 0) -> tuple[int, int]: + return struct.unpack_from(">H", data, offset)[0], 2 + + +def encode_uint32(value: int) -> bytes: + return struct.pack(">I", value) + + +def decode_uint32(data: bytes, offset: int = 0) -> tuple[int, int]: + return struct.unpack_from(">I", data, offset)[0], 4 + + +def encode_uint64(value: int) -> bytes: + return struct.pack(">Q", value) + + +def decode_uint64(data: bytes, offset: int = 0) -> tuple[int, int]: + return struct.unpack_from(">Q", data, offset)[0], 8 + + +def encode_int16(value: int) -> bytes: + return struct.pack(">h", value) + + +def decode_int16(data: bytes, offset: int = 0) -> tuple[int, int]: + return struct.unpack_from(">h", data, offset)[0], 2 + + +def encode_int32(value: int) -> bytes: + return struct.pack(">i", value) + + +def decode_int32(data: bytes, offset: int = 0) -> tuple[int, int]: + return struct.unpack_from(">i", data, offset)[0], 4 + + +def encode_int64(value: int) -> bytes: + return struct.pack(">q", value) + + +def decode_int64(data: bytes, offset: int = 0) -> tuple[int, int]: + return struct.unpack_from(">q", data, offset)[0], 8 + + +def encode_float32(value: float) -> bytes: + return struct.pack(">f", value) + + +def decode_float32(data: bytes, offset: int = 0) -> tuple[float, int]: + return struct.unpack_from(">f", data, offset)[0], 4 + + +def encode_float64(value: float) -> bytes: + return struct.pack(">d", value) + + +def decode_float64(data: bytes, offset: int = 0) -> tuple[float, int]: + return struct.unpack_from(">d", data, offset)[0], 8 + + +# -- String encoding -- + + +def encode_wstring(value: str) -> bytes: + """Encode a string as UTF-8 (S7CommPlus WString wire format).""" + return value.encode("utf-8") + + +def decode_wstring(data: bytes, offset: int, length: int) -> tuple[str, int]: + """Decode a UTF-8 string. + + Args: + data: Buffer + offset: Start position + length: Number of bytes to decode + + Returns: + Tuple of (decoded_string, bytes_consumed) + """ + return data[offset : offset + length].decode("utf-8"), length + + +# -- Typed value encoding -- + + +def encode_typed_value(datatype: int, value: Any) -> bytes: + """Encode a value with its type tag. + + This prepends the DataType byte before the encoded value, which is how + attribute values are serialized in the S7CommPlus object model. + + Args: + datatype: DataType enum value + value: Value to encode + + Returns: + Type-tagged encoded value + """ + tag = struct.pack(">B", datatype) + + if datatype == DataType.NULL: + return tag + elif datatype == DataType.BOOL: + return tag + struct.pack(">B", 1 if value else 0) + elif datatype == DataType.USINT or datatype == DataType.BYTE: + return tag + struct.pack(">B", value) + elif datatype == DataType.UINT or datatype == DataType.WORD: + return tag + struct.pack(">H", value) + elif datatype == DataType.UDINT or datatype == DataType.DWORD: + return tag + encode_uint32_vlq(value) + elif datatype == DataType.ULINT or datatype == DataType.LWORD: + return tag + encode_uint64_vlq(value) + elif datatype == DataType.SINT: + return tag + struct.pack(">b", value) + elif datatype == DataType.INT: + return tag + struct.pack(">h", value) + elif datatype == DataType.DINT: + return tag + encode_int32_vlq(value) + elif datatype == DataType.LINT: + return tag + encode_int64_vlq(value) + elif datatype == DataType.REAL: + return tag + struct.pack(">f", value) + elif datatype == DataType.LREAL: + return tag + struct.pack(">d", value) + elif datatype == DataType.TIMESTAMP: + return tag + struct.pack(">Q", value) + elif datatype == DataType.TIMESPAN: + return tag + encode_int64_vlq(value) + elif datatype == DataType.RID: + return tag + struct.pack(">I", value) + elif datatype == DataType.AID: + return tag + encode_uint32_vlq(value) + elif datatype == DataType.WSTRING: + encoded: bytes = value.encode("utf-8") + return tag + encode_uint32_vlq(len(encoded)) + encoded + elif datatype == DataType.BLOB: + return bytes(tag + encode_uint32_vlq(len(value)) + value) + else: + raise ValueError(f"Unsupported DataType for encoding: {datatype:#04x}") + + +# -- S7CommPlus request/response payload helpers -- + + +def encode_object_qualifier() -> bytes: + """Encode the S7CommPlus ObjectQualifier structure. + + This fixed structure is appended to GetMultiVariables and + SetMultiVariables requests. + + Reference: thomas-v2/S7CommPlusDriver/Core/S7p.cs EncodeObjectQualifier + """ + result = bytearray() + result += struct.pack(">I", Ids.OBJECT_QUALIFIER) + # ParentRID = RID(0) + result += encode_uint32_vlq(Ids.PARENT_RID) + result += bytes([0x00, DataType.RID]) + struct.pack(">I", 0) + # CompositionAID = AID(0) + result += encode_uint32_vlq(Ids.COMPOSITION_AID) + result += bytes([0x00, DataType.AID]) + encode_uint32_vlq(0) + # KeyQualifier = UDInt(0) + result += encode_uint32_vlq(Ids.KEY_QUALIFIER) + result += bytes([0x00, DataType.UDINT]) + encode_uint32_vlq(0) + # Terminator + result += bytes([0x00]) + return bytes(result) + + +def encode_item_address( + access_area: int, + access_sub_area: int, + lids: list[int] | None = None, + symbol_crc: int = 0, +) -> tuple[bytes, int]: + """Encode an S7CommPlus ItemAddress for variable access. + + Args: + access_area: Access area ID (e.g., 0x8A0E0001 for DB1) + access_sub_area: Sub-area ID (e.g., Ids.DB_VALUE_ACTUAL) + lids: Additional LID values for sub-addressing + symbol_crc: Symbol CRC (0 for no CRC check) + + Returns: + Tuple of (encoded_bytes, field_count) + + Reference: thomas-v2/S7CommPlusDriver/ClientApi/ItemAddress.cs + """ + if lids is None: + lids = [] + result = bytearray() + result += encode_uint32_vlq(symbol_crc) + result += encode_uint32_vlq(access_area) + result += encode_uint32_vlq(len(lids) + 1) # +1 for AccessSubArea + result += encode_uint32_vlq(access_sub_area) + for lid in lids: + result += encode_uint32_vlq(lid) + field_count = 4 + len(lids) # SymbolCrc + AccessArea + NumLIDs + AccessSubArea + LIDs + return bytes(result), field_count + + +def encode_pvalue_blob(data: bytes) -> bytes: + """Encode raw bytes as a BLOB PValue. + + PValue format: [flags:1][datatype:1][length:VLQ][data] + """ + result = bytearray() + result += bytes([0x00, DataType.BLOB]) + result += encode_uint32_vlq(len(data)) + result += data + return bytes(result) + + +def decode_pvalue_to_bytes(data: bytes, offset: int) -> tuple[bytes, int]: + """Decode a PValue from S7CommPlus response to raw bytes. + + Supports scalar types and BLOBs. Returns the raw big-endian bytes + of the value regardless of type. + + Args: + data: Response buffer + offset: Position of the PValue + + Returns: + Tuple of (raw_bytes, bytes_consumed) + """ + if offset + 2 > len(data): + raise ValueError("Not enough data for PValue header") + + flags = data[offset] + datatype = data[offset + 1] + consumed = 2 + + is_array = bool(flags & 0x10) + + if is_array: + # Array: read count then elements + count, c = decode_uint32_vlq(data, offset + consumed) + consumed += c + elem_size = _pvalue_element_size(datatype) + if elem_size > 0: + raw = data[offset + consumed : offset + consumed + count * elem_size] + consumed += count * elem_size + return bytes(raw), consumed + else: + # Variable-length elements (VLQ encoded) + result = bytearray() + for _ in range(count): + val, c = decode_uint32_vlq(data, offset + consumed) + consumed += c + result += encode_uint32_vlq(val) + return bytes(result), consumed + + # Scalar types + if datatype == DataType.NULL: + return b"", consumed + elif datatype == DataType.BOOL: + return data[offset + consumed : offset + consumed + 1], consumed + 1 + elif datatype in (DataType.USINT, DataType.BYTE, DataType.SINT): + return data[offset + consumed : offset + consumed + 1], consumed + 1 + elif datatype in (DataType.UINT, DataType.WORD, DataType.INT): + return data[offset + consumed : offset + consumed + 2], consumed + 2 + elif datatype in (DataType.UDINT, DataType.DWORD): + val, c = decode_uint32_vlq(data, offset + consumed) + consumed += c + return struct.pack(">I", val), consumed + elif datatype in (DataType.DINT,): + # Signed VLQ + from .vlq import decode_int32_vlq + + val, c = decode_int32_vlq(data, offset + consumed) + consumed += c + return struct.pack(">i", val), consumed + elif datatype == DataType.REAL: + return data[offset + consumed : offset + consumed + 4], consumed + 4 + elif datatype == DataType.LREAL: + return data[offset + consumed : offset + consumed + 8], consumed + 8 + elif datatype in (DataType.ULINT, DataType.LWORD): + val, c = decode_uint64_vlq(data, offset + consumed) + consumed += c + return struct.pack(">Q", val), consumed + elif datatype in (DataType.LINT,): + from .vlq import decode_int64_vlq + + val, c = decode_int64_vlq(data, offset + consumed) + consumed += c + return struct.pack(">q", val), consumed + elif datatype == DataType.TIMESTAMP: + return data[offset + consumed : offset + consumed + 8], consumed + 8 + elif datatype == DataType.TIMESPAN: + from .vlq import decode_int64_vlq + + val, c = decode_int64_vlq(data, offset + consumed) + consumed += c + return struct.pack(">q", val), consumed + elif datatype == DataType.RID: + return data[offset + consumed : offset + consumed + 4], consumed + 4 + elif datatype == DataType.AID: + val, c = decode_uint32_vlq(data, offset + consumed) + consumed += c + return struct.pack(">I", val), consumed + elif datatype == DataType.BLOB: + length, c = decode_uint32_vlq(data, offset + consumed) + consumed += c + raw = data[offset + consumed : offset + consumed + length] + consumed += length + return bytes(raw), consumed + elif datatype == DataType.WSTRING: + length, c = decode_uint32_vlq(data, offset + consumed) + consumed += c + raw = data[offset + consumed : offset + consumed + length] + consumed += length + return bytes(raw), consumed + elif datatype == DataType.STRUCT: + # Struct: read count, then nested PValues + count, c = decode_uint32_vlq(data, offset + consumed) + consumed += c + result = bytearray() + for _ in range(count): + val_bytes, c = decode_pvalue_to_bytes(data, offset + consumed) + consumed += c + result += val_bytes + return bytes(result), consumed + else: + raise ValueError(f"Unsupported PValue datatype: {datatype:#04x}") + + +def _pvalue_element_size(datatype: int) -> int: + """Return the fixed byte size for a PValue array element, or 0 for variable-length.""" + if datatype in (DataType.BOOL, DataType.USINT, DataType.BYTE, DataType.SINT): + return 1 + elif datatype in (DataType.UINT, DataType.WORD, DataType.INT): + return 2 + elif datatype in (DataType.REAL,): + return 4 + elif datatype in (DataType.LREAL, DataType.TIMESTAMP): + return 8 + elif datatype in (DataType.RID,): + return 4 + else: + return 0 # Variable-length (VLQ encoded) diff --git a/snap7/s7commplus/connection.py b/snap7/s7commplus/connection.py new file mode 100644 index 00000000..fbbaf60d --- /dev/null +++ b/snap7/s7commplus/connection.py @@ -0,0 +1,743 @@ +""" +S7CommPlus connection management. + +Establishes an ISO-on-TCP connection to S7-1200/1500 PLCs using the +S7CommPlus protocol, with support for all protocol versions: + +- V1: Early S7-1200 (FW >= V4.0). Simple session handshake. +- V2: Adds integrity checking and session authentication. +- V3: Adds public-key-based key exchange. +- V3 + TLS: TIA Portal V17+. Standard TLS 1.3 with per-device certificates. + +The wire protocol (VLQ encoding, data types, function codes, object model) is +the same across all versions -- only the session authentication layer differs. + +Connection sequence (all versions):: + + 1. TCP connect to port 102 + 2. COTP Connection Request / Confirm + - Local TSAP: 0x0600 + - Remote TSAP: "SIMATIC-ROOT-HMI" (16-byte ASCII string) + 3. InitSSL request / response (unencrypted) + 4. TLS activation (for V3/TLS PLCs) + 5. S7CommPlus CreateObject request (NullServer session setup) + - SessionId = ObjectNullServerSession (288) + - Proper PObject tree with ServerSession class + 6. PLC responds with CreateObject response containing: + - Protocol version (V1/V2/V3) + - Session ID + - Server session challenge (V2/V3) + +Version-specific authentication after step 6:: + + V1: No further authentication needed + V2: Session key derivation and integrity checking + V3 (no TLS): Public-key key exchange + V3 (TLS): TLS 1.3 handshake is already done in step 4 + +Reference: thomas-v2/S7CommPlusDriver (C#, LGPL-3.0) +""" + +import logging +import ssl +import struct +from typing import Optional, Type +from types import TracebackType + +from ..connection import ISOTCPConnection +from .protocol import ( + FunctionCode, + Opcode, + ProtocolVersion, + ElementID, + ObjectId, + S7COMMPLUS_LOCAL_TSAP, + S7COMMPLUS_REMOTE_TSAP, +) +from .codec import encode_header, decode_header, encode_typed_value, encode_object_qualifier +from .vlq import encode_uint32_vlq, decode_uint32_vlq, decode_uint64_vlq +from .protocol import DataType + +logger = logging.getLogger(__name__) + + +def _element_size(datatype: int) -> int: + """Return the fixed byte size for an array element, or 0 for variable-length.""" + if datatype in (DataType.BOOL, DataType.USINT, DataType.BYTE, DataType.SINT): + return 1 + elif datatype in (DataType.UINT, DataType.WORD, DataType.INT): + return 2 + elif datatype in (DataType.REAL, DataType.RID): + return 4 + elif datatype in (DataType.LREAL, DataType.TIMESTAMP): + return 8 + else: + return 0 + + +class S7CommPlusConnection: + """S7CommPlus connection with multi-version support. + + Wraps an ISOTCPConnection and adds: + - S7CommPlus session establishment (CreateObject) + - Protocol version detection from PLC response + - Version-appropriate authentication (V1/V2/V3/TLS) + - Frame send/receive (TLS-encrypted when using V17+ firmware) + + Currently implements V1 authentication. V2/V3/TLS authentication + layers are planned for future development. + """ + + def __init__( + self, + host: str, + port: int = 102, + ): + self.host = host + self.port = port + + self._iso_conn = ISOTCPConnection( + host=host, + port=port, + local_tsap=S7COMMPLUS_LOCAL_TSAP, + remote_tsap=S7COMMPLUS_REMOTE_TSAP, + ) + + self._ssl_context: Optional[ssl.SSLContext] = None + self._session_id: int = 0 + self._sequence_number: int = 0 + self._protocol_version: int = 0 # Detected from PLC response + self._tls_active: bool = False + self._connected = False + self._server_session_version: Optional[int] = None + + @property + def connected(self) -> bool: + return self._connected + + @property + def protocol_version(self) -> int: + """Protocol version negotiated with the PLC.""" + return self._protocol_version + + @property + def session_id(self) -> int: + """Session ID assigned by the PLC.""" + return self._session_id + + @property + def tls_active(self) -> bool: + """Whether TLS encryption is active on this connection.""" + return self._tls_active + + def connect( + self, + timeout: float = 5.0, + use_tls: bool = False, + tls_cert: Optional[str] = None, + tls_key: Optional[str] = None, + tls_ca: Optional[str] = None, + ) -> None: + """Establish S7CommPlus connection. + + The connection sequence: + 1. COTP connection (same as legacy S7comm) + 2. CreateObject to establish S7CommPlus session + 3. Protocol version is detected from PLC response + 4. If use_tls=True and PLC supports it, TLS is negotiated + + Args: + timeout: Connection timeout in seconds + use_tls: Whether to attempt TLS negotiation. + tls_cert: Path to client TLS certificate (PEM) + tls_key: Path to client private key (PEM) + tls_ca: Path to CA certificate for PLC verification (PEM) + """ + try: + # Step 1: COTP connection (same TSAP for all S7CommPlus versions) + self._iso_conn.connect(timeout) + + # Step 2: InitSSL handshake (required before CreateObject) + self._init_ssl() + + # Step 3: TLS activation (required for modern firmware) + if use_tls: + # TODO: Perform TLS 1.3 handshake over the existing COTP connection + raise NotImplementedError("TLS activation is not yet implemented. Use use_tls=False for V1 connections.") + + # Step 4: CreateObject (S7CommPlus session setup) + self._create_session() + + # Step 5: Session setup - echo ServerSessionVersion back to PLC + if self._server_session_version is not None: + self._setup_session() + else: + logger.warning("PLC did not provide ServerSessionVersion - session setup incomplete") + + # Step 6: Version-specific authentication + if self._protocol_version >= ProtocolVersion.V3: + if not use_tls: + logger.warning( + "PLC reports V3 protocol but TLS is not enabled. Connection may not work without use_tls=True." + ) + elif self._protocol_version == ProtocolVersion.V2: + # TODO: Proprietary HMAC-SHA256/AES session auth + raise NotImplementedError("V2 authentication is not yet implemented.") + + # V1: No further authentication needed after CreateObject + self._connected = True + logger.info( + f"S7CommPlus connected to {self.host}:{self.port}, version=V{self._protocol_version}, session={self._session_id}" + ) + + except Exception: + self.disconnect() + raise + + def disconnect(self) -> None: + """Disconnect from PLC.""" + if self._connected and self._session_id: + try: + self._delete_session() + except Exception: + pass + + self._connected = False + self._tls_active = False + self._session_id = 0 + self._sequence_number = 0 + self._protocol_version = 0 + self._server_session_version = None + self._iso_conn.disconnect() + + def send_request(self, function_code: int, payload: bytes = b"") -> bytes: + """Send an S7CommPlus request and receive the response. + + Args: + function_code: S7CommPlus function code + payload: Request payload (after the 14-byte request header) + + Returns: + Response payload (after the 14-byte response header) + """ + if not self._connected: + from ..error import S7ConnectionError + + raise S7ConnectionError("Not connected") + + seq_num = self._next_sequence_number() + + # Build request header + request_header = struct.pack( + ">BHHHHIB", + Opcode.REQUEST, + 0x0000, # Reserved + function_code, + 0x0000, # Reserved + seq_num, + self._session_id, + 0x36, # Transport flags + ) + request = request_header + payload + + logger.debug(f"=== SEND REQUEST === function_code=0x{function_code:04X} seq={seq_num} session=0x{self._session_id:08X}") + logger.debug(f" Request header (14 bytes): {request_header.hex(' ')}") + logger.debug(f" Request payload ({len(payload)} bytes): {payload.hex(' ')}") + + # Add S7CommPlus frame header and trailer, then send + frame = encode_header(self._protocol_version, len(request)) + request + frame += struct.pack(">BBH", 0x72, self._protocol_version, 0x0000) + + logger.debug(f" Full frame ({len(frame)} bytes): {frame.hex(' ')}") + self._iso_conn.send_data(frame) + + # Receive response + response_frame = self._iso_conn.receive_data() + logger.debug(f"=== RECV RESPONSE === raw frame ({len(response_frame)} bytes): {response_frame.hex(' ')}") + + # Parse frame header, use data_length to exclude trailer + version, data_length, consumed = decode_header(response_frame) + logger.debug(f" Frame header: version=V{version}, data_length={data_length}, header_size={consumed}") + + response = response_frame[consumed : consumed + data_length] + logger.debug(f" Response data ({len(response)} bytes): {response.hex(' ')}") + + if len(response) < 14: + from ..error import S7ConnectionError + + raise S7ConnectionError("Response too short") + + # Parse response header for debug + resp_opcode = response[0] + resp_func = struct.unpack_from(">H", response, 3)[0] + resp_seq = struct.unpack_from(">H", response, 7)[0] + resp_session = struct.unpack_from(">I", response, 9)[0] + resp_transport = response[13] + logger.debug( + f" Response header: opcode=0x{resp_opcode:02X} function=0x{resp_func:04X} " + f"seq={resp_seq} session=0x{resp_session:08X} transport=0x{resp_transport:02X}" + ) + + resp_payload = response[14:] + logger.debug(f" Response payload ({len(resp_payload)} bytes): {resp_payload.hex(' ')}") + + # Check for trailer bytes after data_length + trailer = response_frame[consumed + data_length :] + if trailer: + logger.debug(f" Trailer ({len(trailer)} bytes): {trailer.hex(' ')}") + + return resp_payload + + def _init_ssl(self) -> None: + """Send InitSSL request to prepare the connection. + + This is the first S7CommPlus message sent after COTP connect. + The PLC responds with an InitSSL response. For PLCs that support + TLS, the caller should then activate TLS before sending CreateObject. + For V1 PLCs without TLS, the response may indicate that TLS is + not supported, but the connection can continue without it. + + Reference: thomas-v2/S7CommPlusDriver InitSslRequest + """ + seq_num = self._next_sequence_number() + + # InitSSL request: header + padding + request = struct.pack( + ">BHHHHIB", + Opcode.REQUEST, + 0x0000, # Reserved + FunctionCode.INIT_SSL, + 0x0000, # Reserved + seq_num, + 0x00000000, # No session yet + 0x30, # Transport flags (0x30 for InitSSL) + ) + # Trailing padding + request += struct.pack(">I", 0) + + # Wrap in S7CommPlus frame header + trailer + frame = encode_header(ProtocolVersion.V1, len(request)) + request + frame += struct.pack(">BBH", 0x72, ProtocolVersion.V1, 0x0000) + + logger.debug(f"=== InitSSL === sending ({len(frame)} bytes): {frame.hex(' ')}") + self._iso_conn.send_data(frame) + + # Receive InitSSL response + response_frame = self._iso_conn.receive_data() + logger.debug(f"=== InitSSL === received ({len(response_frame)} bytes): {response_frame.hex(' ')}") + + # Parse S7CommPlus frame header + version, data_length, consumed = decode_header(response_frame) + response = response_frame[consumed:] + + if len(response) < 14: + from ..error import S7ConnectionError + + raise S7ConnectionError("InitSSL response too short") + + logger.debug(f"InitSSL response: version=V{version}, data_length={data_length}") + logger.debug(f"InitSSL response body ({len(response)} bytes): {response.hex(' ')}") + + def _create_session(self) -> None: + """Send CreateObject request to establish an S7CommPlus session. + + Builds a NullServerSession CreateObject request matching the + structure expected by S7-1200/1500 PLCs: + + Reference: thomas-v2/S7CommPlusDriver CreateObjectRequest.SetNullServerSessionData() + """ + seq_num = self._next_sequence_number() + + # Build CreateObject request header + request = struct.pack( + ">BHHHHIB", + Opcode.REQUEST, + 0x0000, + FunctionCode.CREATE_OBJECT, + 0x0000, + seq_num, + ObjectId.OBJECT_NULL_SERVER_SESSION, # SessionId = 288 for initial setup + 0x36, # Transport flags + ) + + # RequestId: ObjectServerSessionContainer (285) + request += struct.pack(">I", ObjectId.OBJECT_SERVER_SESSION_CONTAINER) + + # RequestValue: ValueUDInt(0) = DatatypeFlags(0x00) + Datatype.UDInt(0x04) + VLQ(0) + request += bytes([0x00, DataType.UDINT]) + encode_uint32_vlq(0) + + # Unknown padding (always 0) + request += struct.pack(">I", 0) + + # RequestObject: PObject for NullServerSession + # StartOfObject + request += bytes([ElementID.START_OF_OBJECT]) + # RelationId: GetNewRIDOnServer (211) + request += struct.pack(">I", ObjectId.GET_NEW_RID_ON_SERVER) + # ClassId: ClassServerSession (287), VLQ encoded + request += encode_uint32_vlq(ObjectId.CLASS_SERVER_SESSION) + # ClassFlags: 0 + request += encode_uint32_vlq(0) + # AttributeId: None (0) + request += encode_uint32_vlq(0) + + # Attribute: ServerSessionClientRID (300) = RID 0x80c3c901 + request += bytes([ElementID.ATTRIBUTE]) + request += encode_uint32_vlq(ObjectId.SERVER_SESSION_CLIENT_RID) + request += encode_typed_value(DataType.RID, 0x80C3C901) + + # Nested object: ClassSubscriptions + request += bytes([ElementID.START_OF_OBJECT]) + request += struct.pack(">I", ObjectId.GET_NEW_RID_ON_SERVER) + request += encode_uint32_vlq(ObjectId.CLASS_SUBSCRIPTIONS) + request += encode_uint32_vlq(0) # ClassFlags + request += encode_uint32_vlq(0) # AttributeId + request += bytes([ElementID.TERMINATING_OBJECT]) + + # End outer object + request += bytes([ElementID.TERMINATING_OBJECT]) + + # Trailing padding + request += struct.pack(">I", 0) + + # Wrap in S7CommPlus frame header + trailer + frame = encode_header(ProtocolVersion.V1, len(request)) + request + # S7CommPlus trailer (end-of-frame marker) + frame += struct.pack(">BBH", 0x72, ProtocolVersion.V1, 0x0000) + + logger.debug(f"=== CreateObject === sending ({len(frame)} bytes): {frame.hex(' ')}") + self._iso_conn.send_data(frame) + + # Receive response + response_frame = self._iso_conn.receive_data() + logger.debug(f"=== CreateObject === received ({len(response_frame)} bytes): {response_frame.hex(' ')}") + + # Parse S7CommPlus frame header + version, data_length, consumed = decode_header(response_frame) + response = response_frame[consumed:] + + logger.debug(f"CreateObject response: version=V{version}, data_length={data_length}") + logger.debug(f"CreateObject response body ({len(response)} bytes): {response.hex(' ')}") + + if len(response) < 14: + from ..error import S7ConnectionError + + raise S7ConnectionError("CreateObject response too short") + + # Extract session ID from response header + self._session_id = struct.unpack_from(">I", response, 9)[0] + self._protocol_version = version + + # Parse and log the full response header + resp_opcode = response[0] + resp_func = struct.unpack_from(">H", response, 3)[0] + resp_seq = struct.unpack_from(">H", response, 7)[0] + resp_transport = response[13] + logger.debug( + f"CreateObject response header: opcode=0x{resp_opcode:02X} function=0x{resp_func:04X} " + f"seq={resp_seq} session=0x{self._session_id:08X} transport=0x{resp_transport:02X}" + ) + logger.debug(f"CreateObject response payload: {response[14:].hex(' ')}") + logger.debug(f"Session created: id=0x{self._session_id:08X} ({self._session_id}), version=V{version}") + + # Parse response payload to extract ServerSessionVersion + self._parse_create_object_response(response[14:]) + + def _parse_create_object_response(self, payload: bytes) -> None: + """Parse CreateObject response payload to extract ServerSessionVersion. + + The response contains a PObject tree with attributes. We scan for + attribute 306 (ServerSessionVersion) which must be echoed back to + complete the session handshake. + + Args: + payload: Response payload after the 14-byte response header + """ + offset = 0 + while offset < len(payload): + tag = payload[offset] + + if tag == ElementID.ATTRIBUTE: + offset += 1 + if offset >= len(payload): + break + attr_id, consumed = decode_uint32_vlq(payload, offset) + offset += consumed + + if attr_id == ObjectId.SERVER_SESSION_VERSION: + # Next bytes are the typed value: flags + datatype + VLQ value + if offset + 2 > len(payload): + break + _flags = payload[offset] + datatype = payload[offset + 1] + offset += 2 + if datatype == DataType.UDINT: + value, consumed = decode_uint32_vlq(payload, offset) + offset += consumed + self._server_session_version = value + logger.info(f"ServerSessionVersion = {value}") + return + elif datatype == DataType.DWORD: + value, consumed = decode_uint32_vlq(payload, offset) + offset += consumed + self._server_session_version = value + logger.info(f"ServerSessionVersion = {value}") + return + else: + # Skip unknown type - try to continue scanning + logger.debug(f"ServerSessionVersion has unexpected type {datatype:#04x}") + else: + # Skip this attribute's value - we don't parse it, just advance + # Try to skip the typed value (flags + datatype + value) + if offset + 2 > len(payload): + break + _flags = payload[offset] + datatype = payload[offset + 1] + offset += 2 + offset = self._skip_typed_value(payload, offset, datatype, _flags) + + elif tag == ElementID.START_OF_OBJECT: + offset += 1 + # Skip RelationId (4 bytes fixed) + ClassId (VLQ) + ClassFlags (VLQ) + AttributeId (VLQ) + if offset + 4 > len(payload): + break + offset += 4 # RelationId + _, consumed = decode_uint32_vlq(payload, offset) + offset += consumed # ClassId + _, consumed = decode_uint32_vlq(payload, offset) + offset += consumed # ClassFlags + _, consumed = decode_uint32_vlq(payload, offset) + offset += consumed # AttributeId + + elif tag == ElementID.TERMINATING_OBJECT: + offset += 1 + + elif tag == 0x00: + # Null terminator / padding + offset += 1 + + else: + # Unknown tag - try to skip + offset += 1 + + logger.debug("ServerSessionVersion not found in CreateObject response") + + def _skip_typed_value(self, data: bytes, offset: int, datatype: int, flags: int) -> int: + """Skip over a typed value in the PObject tree. + + Best-effort: advances offset past common value types. + Returns new offset. + """ + is_array = bool(flags & 0x10) + + if is_array: + if offset >= len(data): + return offset + count, consumed = decode_uint32_vlq(data, offset) + offset += consumed + # For fixed-size types, skip count * size + elem_size = _element_size(datatype) + if elem_size > 0: + offset += count * elem_size + else: + # Variable-length: skip each VLQ element + for _ in range(count): + if offset >= len(data): + break + _, consumed = decode_uint32_vlq(data, offset) + offset += consumed + return offset + + if datatype == DataType.NULL: + return offset + elif datatype in (DataType.BOOL, DataType.USINT, DataType.BYTE, DataType.SINT): + return offset + 1 + elif datatype in (DataType.UINT, DataType.WORD, DataType.INT): + return offset + 2 + elif datatype in (DataType.UDINT, DataType.DWORD, DataType.AID, DataType.DINT): + _, consumed = decode_uint32_vlq(data, offset) + return offset + consumed + elif datatype in (DataType.ULINT, DataType.LWORD, DataType.LINT): + _, consumed = decode_uint64_vlq(data, offset) + return offset + consumed + elif datatype == DataType.REAL: + return offset + 4 + elif datatype == DataType.LREAL: + return offset + 8 + elif datatype == DataType.TIMESTAMP: + return offset + 8 + elif datatype == DataType.TIMESPAN: + _, consumed = decode_uint64_vlq(data, offset) # int64 VLQ + return offset + consumed + elif datatype == DataType.RID: + return offset + 4 + elif datatype in (DataType.BLOB, DataType.WSTRING): + length, consumed = decode_uint32_vlq(data, offset) + return offset + consumed + length + elif datatype == DataType.STRUCT: + count, consumed = decode_uint32_vlq(data, offset) + offset += consumed + for _ in range(count): + if offset + 2 > len(data): + break + sub_flags = data[offset] + sub_type = data[offset + 1] + offset += 2 + offset = self._skip_typed_value(data, offset, sub_type, sub_flags) + return offset + else: + # Unknown type - can't skip reliably + return offset + + def _setup_session(self) -> None: + """Send SetMultiVariables to echo ServerSessionVersion back to the PLC. + + This completes the session handshake by writing the ServerSessionVersion + attribute back to the session object. Without this step, the PLC rejects + all subsequent data operations with ERROR2 (0x05A9). + + Reference: thomas-v2/S7CommPlusDriver SetSessionSetupData + """ + if self._server_session_version is None: + return + + seq_num = self._next_sequence_number() + + # Build SetMultiVariables request + request = struct.pack( + ">BHHHHIB", + Opcode.REQUEST, + 0x0000, + FunctionCode.SET_MULTI_VARIABLES, + 0x0000, + seq_num, + self._session_id, + 0x36, # Transport flags + ) + + payload = bytearray() + # InObjectId = session ID (tells PLC which object we're writing to) + payload += struct.pack(">I", self._session_id) + # Item count = 1 + payload += encode_uint32_vlq(1) + # Total address field count = 1 (just the attribute ID) + payload += encode_uint32_vlq(1) + # Address: attribute ID = ServerSessionVersion (306) as VLQ + payload += encode_uint32_vlq(ObjectId.SERVER_SESSION_VERSION) + # Value: ItemNumber = 1 (VLQ) + payload += encode_uint32_vlq(1) + # PValue: flags=0x00, type=UDInt, VLQ-encoded value + payload += bytes([0x00, DataType.UDINT]) + payload += encode_uint32_vlq(self._server_session_version) + # Fill byte + payload += bytes([0x00]) + # ObjectQualifier + payload += encode_object_qualifier() + # Trailing padding + payload += struct.pack(">I", 0) + + request += bytes(payload) + + # Wrap in S7CommPlus frame + frame = encode_header(self._protocol_version, len(request)) + request + frame += struct.pack(">BBH", 0x72, self._protocol_version, 0x0000) + + logger.debug(f"=== SetupSession === sending ({len(frame)} bytes): {frame.hex(' ')}") + self._iso_conn.send_data(frame) + + # Receive response + response_frame = self._iso_conn.receive_data() + logger.debug(f"=== SetupSession === received ({len(response_frame)} bytes): {response_frame.hex(' ')}") + + version, data_length, consumed = decode_header(response_frame) + response = response_frame[consumed : consumed + data_length] + + if len(response) < 14: + from ..error import S7ConnectionError + + raise S7ConnectionError("SetupSession response too short") + + resp_func = struct.unpack_from(">H", response, 3)[0] + logger.debug(f"SetupSession response: function=0x{resp_func:04X}") + + # Parse return value from payload + resp_payload = response[14:] + if len(resp_payload) >= 1: + return_value, _ = decode_uint64_vlq(resp_payload, 0) + if return_value != 0: + logger.warning(f"SetupSession: PLC returned error {return_value}") + else: + logger.info("Session setup completed successfully") + + def _delete_session(self) -> None: + """Send DeleteObject to close the session.""" + seq_num = self._next_sequence_number() + + request = struct.pack( + ">BHHHHIB", + Opcode.REQUEST, + 0x0000, + FunctionCode.DELETE_OBJECT, + 0x0000, + seq_num, + self._session_id, + 0x36, + ) + request += struct.pack(">I", 0) + + frame = encode_header(self._protocol_version, len(request)) + request + frame += struct.pack(">BBH", 0x72, self._protocol_version, 0x0000) + self._iso_conn.send_data(frame) + + # Best-effort receive + try: + self._iso_conn.receive_data() + except Exception: + pass + + def _next_sequence_number(self) -> int: + """Get next sequence number and increment.""" + seq = self._sequence_number + self._sequence_number = (self._sequence_number + 1) & 0xFFFF + return seq + + def _setup_ssl_context( + self, + cert_path: Optional[str] = None, + key_path: Optional[str] = None, + ca_path: Optional[str] = None, + ) -> ssl.SSLContext: + """Create TLS context for S7CommPlus. + + Args: + cert_path: Client certificate path (PEM) + key_path: Client private key path (PEM) + ca_path: PLC CA certificate path (PEM) + + Returns: + Configured SSLContext + """ + ctx = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT) + ctx.minimum_version = ssl.TLSVersion.TLSv1_3 + + if cert_path and key_path: + ctx.load_cert_chain(cert_path, key_path) + + if ca_path: + ctx.load_verify_locations(ca_path) + else: + ctx.check_hostname = False + ctx.verify_mode = ssl.CERT_NONE + + return ctx + + def __enter__(self) -> "S7CommPlusConnection": + return self + + def __exit__( + self, + exc_type: Optional[Type[BaseException]], + exc_val: Optional[BaseException], + exc_tb: Optional[TracebackType], + ) -> None: + self.disconnect() diff --git a/snap7/s7commplus/protocol.py b/snap7/s7commplus/protocol.py new file mode 100644 index 00000000..2095cb29 --- /dev/null +++ b/snap7/s7commplus/protocol.py @@ -0,0 +1,226 @@ +""" +S7CommPlus protocol constants and types. + +Defines the protocol framing, opcodes, function codes, data types, +element IDs, and other constants needed for S7CommPlus communication. + +Reference: thomas-v2/S7CommPlusDriver (C#, LGPL-3.0) +Reference: Wireshark S7CommPlus dissector +""" + +from enum import IntEnum + + +# Protocol identification byte (vs 0x32 for legacy S7comm) +PROTOCOL_ID = 0x72 + + +class ProtocolVersion(IntEnum): + """S7CommPlus protocol versions. + + V1: Early S7-1200 FW V4.0 -- simple session handshake + V2: Adds integrity checking and session authentication + V3: Adds public-key-based key exchange + TLS: TIA Portal V17+ -- standard TLS 1.3 with per-device certificates + + For new implementations, TLS (V3 + InitSsl) is the recommended target. + """ + + V1 = 0x01 + V2 = 0x02 + V3 = 0x03 + SYSTEM_EVENT = 0xFE + + +class Opcode(IntEnum): + """S7CommPlus opcodes (first byte after header).""" + + REQUEST = 0x31 + RESPONSE = 0x32 + NOTIFICATION = 0x33 + RESPONSE2 = 0x02 # Seen in some older firmware + + +class FunctionCode(IntEnum): + """S7CommPlus function codes. + + These identify the type of operation in a request/response pair. + """ + + ERROR = 0x04B1 + EXPLORE = 0x04BB + CREATE_OBJECT = 0x04CA + DELETE_OBJECT = 0x04D4 + SET_VARIABLE = 0x04F2 + GET_VARIABLE = 0x04FC # Only in old S7-1200 firmware + ADD_LINK = 0x0506 + REMOVE_LINK = 0x051A + GET_LINK = 0x0524 + SET_MULTI_VARIABLES = 0x0542 + GET_MULTI_VARIABLES = 0x054C + BEGIN_SEQUENCE = 0x0556 + END_SEQUENCE = 0x0560 + INVOKE = 0x056B + SET_VAR_SUBSTREAMED = 0x057C + GET_VAR_SUBSTREAMED = 0x0586 + GET_VARIABLES_ADDRESS = 0x0590 + ABORT = 0x059A + ERROR2 = 0x05A9 + INIT_SSL = 0x05B3 + + +class ElementID(IntEnum): + """Tag IDs used in the object serialization format. + + S7CommPlus uses a tagged object model where data is structured as + nested objects with attributes, similar to TLV encoding. + """ + + START_OF_OBJECT = 0xA1 + TERMINATING_OBJECT = 0xA2 + ATTRIBUTE = 0xA3 + RELATION = 0xA4 + START_OF_TAG_DESCRIPTION = 0xA7 + TERMINATING_TAG_DESCRIPTION = 0xA8 + VARTYPE_LIST = 0xAB + VARNAME_LIST = 0xAC + + +class ObjectId(IntEnum): + """Well-known object IDs used in session establishment. + + Reference: thomas-v2/S7CommPlusDriver/Core/Ids.cs + """ + + NONE = 0 + GET_NEW_RID_ON_SERVER = 211 + CLASS_SUBSCRIPTIONS = 255 + CLASS_SERVER_SESSION_CONTAINER = 284 + OBJECT_SERVER_SESSION_CONTAINER = 285 + CLASS_SERVER_SESSION = 287 + OBJECT_NULL_SERVER_SESSION = 288 + SERVER_SESSION_CLIENT_RID = 300 + SERVER_SESSION_VERSION = 306 + + +# Default TSAP for S7CommPlus connections +# The remote TSAP is the ASCII string "SIMATIC-ROOT-HMI" (16 bytes) +S7COMMPLUS_LOCAL_TSAP = 0x0600 +S7COMMPLUS_REMOTE_TSAP = b"SIMATIC-ROOT-HMI" + + +class DataType(IntEnum): + """S7CommPlus wire data types. + + These identify how values are encoded on the wire in the S7CommPlus + protocol. Note: these differ from the Softdatatype IDs used for + PLC variable type metadata. + """ + + NULL = 0x00 + BOOL = 0x01 + USINT = 0x02 + UINT = 0x03 + UDINT = 0x04 + ULINT = 0x05 + SINT = 0x06 + INT = 0x07 + DINT = 0x08 + LINT = 0x09 + BYTE = 0x0A + WORD = 0x0B + DWORD = 0x0C + LWORD = 0x0D + REAL = 0x0E + LREAL = 0x0F + TIMESTAMP = 0x10 + TIMESPAN = 0x11 + RID = 0x12 + AID = 0x13 + BLOB = 0x14 + WSTRING = 0x15 + VARIANT = 0x16 + STRUCT = 0x17 + S7STRING = 0x19 + + +class Ids(IntEnum): + """Well-known IDs for S7CommPlus protocol structures. + + Reference: thomas-v2/S7CommPlusDriver/Core/Ids.cs + """ + + # Data block access sub-areas + DB_VALUE_ACTUAL = 2550 + CONTROLLER_AREA_VALUE_ACTUAL = 2551 + + # ObjectQualifier structure IDs + OBJECT_QUALIFIER = 1256 + PARENT_RID = 1257 + COMPOSITION_AID = 1258 + KEY_QUALIFIER = 1259 + + # Native object RIDs for memory areas + NATIVE_THE_I_AREA_RID = 80 + NATIVE_THE_Q_AREA_RID = 81 + NATIVE_THE_M_AREA_RID = 82 + NATIVE_THE_S7_COUNTERS_RID = 83 + NATIVE_THE_S7_TIMERS_RID = 84 + + # DB AccessArea base (add DB number to get area ID) + DB_ACCESS_AREA_BASE = 0x8A0E0000 + + +class SoftDataType(IntEnum): + """PLC soft data types (used in variable metadata / tag descriptions). + + These correspond to the data types as they appear in the PLC's symbol + table and are used for symbolic access to optimized data blocks. + """ + + VOID = 0 + BOOL = 1 + BYTE = 2 + CHAR = 3 + WORD = 4 + INT = 5 + DWORD = 6 + DINT = 7 + REAL = 8 + DATE = 9 + TIME_OF_DAY = 10 + TIME = 11 + S5TIME = 12 + DATE_AND_TIME = 14 + ARRAY = 16 + STRUCT = 17 + STRING = 19 + POINTER = 20 + ANY = 22 + BLOCK_FB = 23 + BLOCK_FC = 24 + BLOCK_DB = 25 + BLOCK_SDB = 26 + COUNTER = 28 + TIMER = 29 + IEC_COUNTER = 30 + IEC_TIMER = 31 + BLOCK_SFB = 32 + BLOCK_SFC = 33 + BLOCK_OB = 36 + BLOCK_UDT = 37 + LREAL = 48 + ULINT = 49 + LINT = 50 + LWORD = 51 + USINT = 52 + UINT = 53 + UDINT = 54 + SINT = 55 + WCHAR = 61 + WSTRING = 62 + VARIANT = 63 + LTIME = 64 + LTOD = 65 + LDT = 66 + DTL = 67 diff --git a/snap7/s7commplus/server.py b/snap7/s7commplus/server.py new file mode 100644 index 00000000..cc08a057 --- /dev/null +++ b/snap7/s7commplus/server.py @@ -0,0 +1,902 @@ +""" +S7CommPlus server emulator for testing. + +Emulates an S7-1200/1500 PLC for integration testing without real hardware. +Handles the S7CommPlus protocol including: +- COTP connection setup (reuses ISOTCPConnection transport) +- CreateObject session handshake +- Explore (browse registered data blocks and variables) +- GetMultiVariables / SetMultiVariables (read/write by address) +- Internal PLC memory model with thread-safe access + +This server does NOT implement TLS or the proprietary authentication +layers (V2/V3 crypto). It emulates a V1 PLC for testing purposes, +which is sufficient for validating protocol framing, data encoding, +and client logic. + +Usage:: + + server = S7CommPlusServer() + server.register_db(1, {"temperature": ("Real", 0), "pressure": ("Real", 4)}) + server.start(port=11020) + + # ... run tests against localhost:11020 ... + + server.stop() +""" + +import logging +import socket +import struct +import threading +from enum import IntEnum +from typing import Any, Callable, Optional + +from .protocol import ( + DataType, + ElementID, + FunctionCode, + Opcode, + ProtocolVersion, + SoftDataType, +) +from .vlq import encode_uint32_vlq, decode_uint32_vlq, encode_uint64_vlq +from .codec import ( + encode_header, + decode_header, + encode_typed_value, + encode_pvalue_blob, + decode_pvalue_to_bytes, +) + +logger = logging.getLogger(__name__) + + +class CPUState(IntEnum): + """Emulated CPU operational state.""" + + UNKNOWN = 0 + STOP = 1 + RUN = 2 + + +# Mapping from SoftDataType to wire DataType and byte size +_SOFT_TO_WIRE: dict[int, tuple[int, int]] = { + SoftDataType.BOOL: (DataType.BOOL, 1), + SoftDataType.BYTE: (DataType.BYTE, 1), + SoftDataType.CHAR: (DataType.BYTE, 1), + SoftDataType.WORD: (DataType.WORD, 2), + SoftDataType.INT: (DataType.INT, 2), + SoftDataType.DWORD: (DataType.DWORD, 4), + SoftDataType.DINT: (DataType.DINT, 4), + SoftDataType.REAL: (DataType.REAL, 4), + SoftDataType.LREAL: (DataType.LREAL, 8), + SoftDataType.USINT: (DataType.USINT, 1), + SoftDataType.UINT: (DataType.UINT, 2), + SoftDataType.UDINT: (DataType.UDINT, 4), + SoftDataType.SINT: (DataType.SINT, 1), + SoftDataType.ULINT: (DataType.ULINT, 8), + SoftDataType.LINT: (DataType.LINT, 8), + SoftDataType.LWORD: (DataType.LWORD, 8), + SoftDataType.STRING: (DataType.S7STRING, 256), + SoftDataType.WSTRING: (DataType.WSTRING, 512), +} + +# Map string type names to SoftDataType values +_TYPE_NAME_MAP: dict[str, int] = { + "Bool": SoftDataType.BOOL, + "Byte": SoftDataType.BYTE, + "Char": SoftDataType.CHAR, + "Word": SoftDataType.WORD, + "Int": SoftDataType.INT, + "DWord": SoftDataType.DWORD, + "DInt": SoftDataType.DINT, + "Real": SoftDataType.REAL, + "LReal": SoftDataType.LREAL, + "USInt": SoftDataType.USINT, + "UInt": SoftDataType.UINT, + "UDInt": SoftDataType.UDINT, + "SInt": SoftDataType.SINT, + "ULInt": SoftDataType.ULINT, + "LInt": SoftDataType.LINT, + "LWord": SoftDataType.LWORD, + "String": SoftDataType.STRING, + "WString": SoftDataType.WSTRING, +} + + +class DBVariable: + """A variable in a data block.""" + + def __init__(self, name: str, soft_datatype: int, byte_offset: int): + self.name = name + self.soft_datatype = soft_datatype + self.byte_offset = byte_offset + + wire_info = _SOFT_TO_WIRE.get(soft_datatype, (DataType.BYTE, 1)) + self.wire_datatype = wire_info[0] + self.byte_size = wire_info[1] + + def __repr__(self) -> str: + return f"DBVariable({self.name!r}, type={self.soft_datatype}, offset={self.byte_offset})" + + +class DataBlock: + """An emulated PLC data block with named variables.""" + + def __init__(self, number: int, size: int = 1024): + self.number = number + self.data = bytearray(size) + self.variables: dict[str, DBVariable] = {} + self.lock = threading.Lock() + # Assign a unique object ID for the S7CommPlus object tree + self.object_id = 0x00010000 | (number & 0xFFFF) + + def add_variable(self, name: str, type_name: str, byte_offset: int) -> None: + """Register a named variable in this data block. + + Args: + name: Variable name (e.g. "temperature") + type_name: PLC type name (e.g. "Real", "Int", "Bool") + byte_offset: Byte offset within the data block + """ + soft_type = _TYPE_NAME_MAP.get(type_name) + if soft_type is None: + raise ValueError(f"Unknown type name: {type_name!r}") + self.variables[name] = DBVariable(name, soft_type, byte_offset) + + def read(self, offset: int, size: int) -> bytes: + """Read bytes from the data block.""" + with self.lock: + end = min(offset + size, len(self.data)) + result = bytes(self.data[offset:end]) + # Pad with zeros if reading past end + if len(result) < size: + result += b"\x00" * (size - len(result)) + return result + + def write(self, offset: int, data: bytes) -> None: + """Write bytes to the data block.""" + with self.lock: + end = min(offset + len(data), len(self.data)) + self.data[offset:end] = data[: end - offset] + + def read_variable(self, name: str) -> tuple[int, bytes]: + """Read a named variable. + + Returns: + Tuple of (wire_datatype, raw_bytes) + """ + var = self.variables.get(name) + if var is None: + raise KeyError(f"Variable not found: {name!r}") + raw = self.read(var.byte_offset, var.byte_size) + return var.wire_datatype, raw + + def write_variable(self, name: str, data: bytes) -> None: + """Write a named variable.""" + var = self.variables.get(name) + if var is None: + raise KeyError(f"Variable not found: {name!r}") + self.write(var.byte_offset, data) + + +class S7CommPlusServer: + """S7CommPlus PLC emulator for testing. + + Emulates an S7-1200/1500 PLC with: + - Internal data block storage with named variables + - S7CommPlus protocol handling (V1 level) + - Multi-client support (threaded) + - CPU state management + """ + + def __init__(self) -> None: + self._data_blocks: dict[int, DataBlock] = {} + self._cpu_state = CPUState.RUN + self._protocol_version = ProtocolVersion.V1 + self._next_session_id = 1 + + self._server_socket: Optional[socket.socket] = None + self._server_thread: Optional[threading.Thread] = None + self._client_threads: list[threading.Thread] = [] + self._running = False + self._lock = threading.Lock() + self._event_callback: Optional[Callable[..., None]] = None + + @property + def cpu_state(self) -> CPUState: + return self._cpu_state + + @cpu_state.setter + def cpu_state(self, state: CPUState) -> None: + self._cpu_state = state + + def register_db(self, db_number: int, variables: dict[str, tuple[str, int]], size: int = 1024) -> DataBlock: + """Register a data block with named variables. + + Args: + db_number: Data block number (e.g. 1 for DB1) + variables: Dict mapping variable name to (type_name, byte_offset) + e.g. {"temperature": ("Real", 0), "count": ("Int", 4)} + size: Data block size in bytes + + Returns: + The created DataBlock + + Example:: + + server.register_db(1, { + "temperature": ("Real", 0), + "pressure": ("Real", 4), + "running": ("Bool", 8), + "count": ("DInt", 10), + }) + """ + db = DataBlock(db_number, size) + for name, (type_name, offset) in variables.items(): + db.add_variable(name, type_name, offset) + self._data_blocks[db_number] = db + return db + + def register_raw_db(self, db_number: int, data: bytearray) -> DataBlock: + """Register a data block with raw data (no named variables). + + Args: + db_number: Data block number + data: Initial data block content + + Returns: + The created DataBlock + """ + db = DataBlock(db_number, len(data)) + db.data = data + self._data_blocks[db_number] = db + return db + + def get_db(self, db_number: int) -> Optional[DataBlock]: + """Get a registered data block.""" + return self._data_blocks.get(db_number) + + def start(self, host: str = "127.0.0.1", port: int = 11020) -> None: + """Start the server. + + Args: + host: Bind address + port: TCP port to listen on + """ + if self._running: + raise RuntimeError("Server is already running") + + self._server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) + self._server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) + self._server_socket.settimeout(1.0) + self._server_socket.bind((host, port)) + self._server_socket.listen(5) + + self._running = True + self._server_thread = threading.Thread(target=self._server_loop, daemon=True, name="s7commplus-server") + self._server_thread.start() + logger.info(f"S7CommPlus server started on {host}:{port}") + + def stop(self) -> None: + """Stop the server.""" + self._running = False + + if self._server_socket: + try: + self._server_socket.close() + except Exception: + pass + self._server_socket = None + + if self._server_thread: + self._server_thread.join(timeout=5.0) + self._server_thread = None + + for t in self._client_threads: + t.join(timeout=2.0) + self._client_threads.clear() + + logger.info("S7CommPlus server stopped") + + def _server_loop(self) -> None: + """Main server accept loop.""" + while self._running: + try: + if self._server_socket is None: + break + client_sock, address = self._server_socket.accept() + logger.info(f"Client connected from {address}") + t = threading.Thread( + target=self._handle_client, + args=(client_sock, address), + daemon=True, + name=f"s7commplus-client-{address}", + ) + self._client_threads.append(t) + t.start() + except socket.timeout: + continue + except OSError: + break + + def _handle_client(self, client_sock: socket.socket, address: tuple[str, int]) -> None: + """Handle a single client connection.""" + try: + client_sock.settimeout(5.0) + + # Step 1: COTP handshake + if not self._handle_cotp_connect(client_sock): + return + + # Step 2: S7CommPlus session + session_id = 0 + + while self._running: + try: + # Receive TPKT + COTP DT + S7CommPlus data + data = self._recv_s7commplus_frame(client_sock) + if data is None: + break + + # Process the S7CommPlus request + response = self._process_request(data, session_id) + + if response is not None: + # Check if session ID was assigned + if session_id == 0 and len(response) >= 14: + # Extract session ID from response for tracking + session_id = struct.unpack_from(">I", response, 9)[0] + + self._send_s7commplus_frame(client_sock, response) + + except socket.timeout: + continue + except (ConnectionError, OSError): + break + + except Exception as e: + logger.debug(f"Client handler error: {e}") + finally: + try: + client_sock.close() + except Exception: + pass + logger.info(f"Client disconnected: {address}") + + def _handle_cotp_connect(self, sock: socket.socket) -> bool: + """Handle COTP Connection Request / Confirm.""" + try: + # Receive TPKT header + tpkt_header = self._recv_exact(sock, 4) + version, _, length = struct.unpack(">BBH", tpkt_header) + if version != 3: + return False + + # Receive COTP CR + payload = self._recv_exact(sock, length - 4) + if len(payload) < 7: + return False + + _pdu_len, pdu_type = payload[0], payload[1] + if pdu_type != 0xE0: # COTP CR + return False + + # Parse source ref from CR + src_ref = struct.unpack_from(">H", payload, 4)[0] + + # Build COTP CC response + cc_pdu = struct.pack( + ">BBHHB", + 6, # PDU length + 0xD0, # COTP CC + src_ref, # Destination ref (client's src ref) + 0x0001, # Source ref (our ref) + 0x00, # Class 0 + ) + + # Add PDU size parameter + pdu_size_param = struct.pack(">BBB", 0xC0, 1, 0x0A) # 1024 bytes + cc_pdu = struct.pack(">B", 6 + len(pdu_size_param)) + cc_pdu[1:] + pdu_size_param + + # Send TPKT + CC + tpkt = struct.pack(">BBH", 3, 0, 4 + len(cc_pdu)) + cc_pdu + sock.sendall(tpkt) + + logger.debug("COTP connection established") + return True + + except Exception as e: + logger.debug(f"COTP handshake failed: {e}") + return False + + def _recv_s7commplus_frame(self, sock: socket.socket) -> Optional[bytes]: + """Receive a TPKT/COTP/S7CommPlus frame, return the S7CommPlus payload.""" + try: + # TPKT header + tpkt_header = self._recv_exact(sock, 4) + version, _, length = struct.unpack(">BBH", tpkt_header) + if version != 3 or length <= 4: + return None + + # Remaining data + payload = self._recv_exact(sock, length - 4) + + # Skip COTP DT header (3 bytes: length, type 0xF0, EOT) + if len(payload) < 3 or payload[1] != 0xF0: + return None + + return payload[3:] # S7CommPlus data + + except Exception: + return None + + def _send_s7commplus_frame(self, sock: socket.socket, data: bytes) -> None: + """Send an S7CommPlus frame wrapped in TPKT/COTP.""" + # S7CommPlus header (4 bytes) + data + trailer (4 bytes) + s7plus_frame = encode_header(self._protocol_version, len(data)) + data + s7plus_frame += struct.pack(">BBH", 0x72, self._protocol_version, 0x0000) + + # COTP DT header + cotp_dt = struct.pack(">BBB", 2, 0xF0, 0x80) + s7plus_frame + + # TPKT + tpkt = struct.pack(">BBH", 3, 0, 4 + len(cotp_dt)) + cotp_dt + sock.sendall(tpkt) + + def _process_request(self, data: bytes, session_id: int) -> Optional[bytes]: + """Process an S7CommPlus request and return a response.""" + if len(data) < 4: + return None + + # Parse S7CommPlus frame header + try: + version, data_length, consumed = decode_header(data) + except ValueError: + return None + + # Use data_length to exclude any trailer + payload = data[consumed : consumed + data_length] + if len(payload) < 14: + return None + + # Parse request header + opcode = payload[0] + if opcode != Opcode.REQUEST: + return None + + function_code = struct.unpack_from(">H", payload, 3)[0] + seq_num = struct.unpack_from(">H", payload, 7)[0] + req_session_id = struct.unpack_from(">I", payload, 9)[0] + request_data = payload[14:] + + if function_code == FunctionCode.INIT_SSL: + return self._handle_init_ssl(seq_num) + elif function_code == FunctionCode.CREATE_OBJECT: + return self._handle_create_object(seq_num, request_data) + elif function_code == FunctionCode.DELETE_OBJECT: + return self._handle_delete_object(seq_num, req_session_id) + elif function_code == FunctionCode.EXPLORE: + return self._handle_explore(seq_num, req_session_id, request_data) + elif function_code == FunctionCode.GET_MULTI_VARIABLES: + return self._handle_get_multi_variables(seq_num, req_session_id, request_data) + elif function_code == FunctionCode.SET_MULTI_VARIABLES: + return self._handle_set_multi_variables(seq_num, req_session_id, request_data) + else: + return self._build_error_response(seq_num, req_session_id, function_code) + + def _handle_init_ssl(self, seq_num: int) -> bytes: + """Handle InitSSL -- respond to SSL initialization (V1 emulation, no real TLS).""" + response = bytearray() + response += struct.pack( + ">BHHHHIB", + Opcode.RESPONSE, + 0x0000, + FunctionCode.INIT_SSL, + 0x0000, + seq_num, + 0x00000000, + 0x00, # Transport flags + ) + response += encode_uint32_vlq(0) # Return code: success + response += struct.pack(">I", 0) + return bytes(response) + + def _handle_create_object(self, seq_num: int, request_data: bytes) -> bytes: + """Handle CreateObject -- establish a session.""" + with self._lock: + session_id = self._next_session_id + self._next_session_id += 1 + + # Build CreateObject response + response = bytearray() + + # Response header + response += struct.pack( + ">BHHHHIB", + Opcode.RESPONSE, + 0x0000, # Reserved + FunctionCode.CREATE_OBJECT, + 0x0000, # Reserved + seq_num, + session_id, + 0x00, # Transport flags + ) + + # Return code: success + response += encode_uint32_vlq(0) + + # Object with session info + response += bytes([ElementID.START_OF_OBJECT]) + response += struct.pack(">I", 0x00000001) # Relation ID + response += encode_uint32_vlq(0x00000000) # Class ID + response += encode_uint32_vlq(0x00000000) # Class flags + response += encode_uint32_vlq(0x00000000) # Attribute ID + + # Session ID attribute + response += bytes([ElementID.ATTRIBUTE]) + response += encode_uint32_vlq(0x0131) # ServerSession ID attribute + response += encode_typed_value(DataType.UDINT, session_id) + + # Protocol version attribute + response += bytes([ElementID.ATTRIBUTE]) + response += encode_uint32_vlq(0x0132) # Protocol version attribute + response += encode_typed_value(DataType.USINT, self._protocol_version) + + response += bytes([ElementID.TERMINATING_OBJECT]) + + # Trailing zeros + response += struct.pack(">I", 0) + + return bytes(response) + + def _handle_delete_object(self, seq_num: int, session_id: int) -> bytes: + """Handle DeleteObject -- close a session.""" + response = bytearray() + response += struct.pack( + ">BHHHHIB", + Opcode.RESPONSE, + 0x0000, + FunctionCode.DELETE_OBJECT, + 0x0000, + seq_num, + session_id, + 0x00, + ) + response += encode_uint32_vlq(0) # Return code: success + response += struct.pack(">I", 0) + return bytes(response) + + def _handle_explore(self, seq_num: int, session_id: int, request_data: bytes) -> bytes: + """Handle Explore -- return the object tree (registered data blocks).""" + response = bytearray() + response += struct.pack( + ">BHHHHIB", + Opcode.RESPONSE, + 0x0000, + FunctionCode.EXPLORE, + 0x0000, + seq_num, + session_id, + 0x00, + ) + response += encode_uint32_vlq(0) # Return code: success + + # Return list of data blocks as objects + for db_num, db in sorted(self._data_blocks.items()): + response += bytes([ElementID.START_OF_OBJECT]) + response += struct.pack(">I", db.object_id) # Relation ID + response += encode_uint32_vlq(0x00000100) # Class: DataBlock + response += encode_uint32_vlq(0x00000000) # Class flags + response += encode_uint32_vlq(0x00000000) # Attribute ID + + # DB number attribute + response += bytes([ElementID.ATTRIBUTE]) + response += encode_uint32_vlq(0x0001) # DB number attribute ID + response += encode_typed_value(DataType.UINT, db_num) + + # DB size attribute + response += bytes([ElementID.ATTRIBUTE]) + response += encode_uint32_vlq(0x0002) # DB size attribute ID + response += encode_typed_value(DataType.UDINT, len(db.data)) + + # Variable list + if db.variables: + response += bytes([ElementID.VARNAME_LIST]) + response += encode_uint32_vlq(len(db.variables)) + for var_name, var in db.variables.items(): + name_bytes = var_name.encode("utf-8") + response += encode_uint32_vlq(len(name_bytes)) + response += name_bytes + response += encode_uint32_vlq(var.soft_datatype) + response += encode_uint32_vlq(var.byte_offset) + + response += bytes([ElementID.TERMINATING_OBJECT]) + + # Final terminator + response += struct.pack(">I", 0) + return bytes(response) + + def _handle_get_multi_variables(self, seq_num: int, session_id: int, request_data: bytes) -> bytes: + """Handle GetMultiVariables -- read variables from data blocks. + + Parses the S7CommPlus request format with ItemAddress structures. + The server extracts db_number from AccessArea and byte offset/size + from the LID values. + + Reference: thomas-v2/S7CommPlusDriver/Core/GetMultiVariablesRequest.cs + """ + response = bytearray() + response += struct.pack( + ">BHHHHIB", + Opcode.RESPONSE, + 0x0000, + FunctionCode.GET_MULTI_VARIABLES, + 0x0000, + seq_num, + session_id, + 0x00, + ) + + # Parse request payload + items = _server_parse_read_request(request_data) + + # ReturnValue: success + response += encode_uint64_vlq(0) + + # Value list: ItemNumber (1-based) + PValue, terminated by ItemNumber=0 + for i, (db_num, byte_offset, byte_size) in enumerate(items, 1): + db = self._data_blocks.get(db_num) + if db is not None: + data = db.read(byte_offset, byte_size) + response += encode_uint32_vlq(i) # ItemNumber + response += encode_pvalue_blob(data) # Value as BLOB + # Errors handled in error list below + + # Terminate value list + response += encode_uint32_vlq(0) + + # Error list + for i, (db_num, byte_offset, byte_size) in enumerate(items, 1): + db = self._data_blocks.get(db_num) + if db is None: + response += encode_uint32_vlq(i) # ErrorItemNumber + response += encode_uint64_vlq(0x8104) # Error: object not found + + # Terminate error list + response += encode_uint32_vlq(0) + + # IntegrityId + response += encode_uint32_vlq(0) + + return bytes(response) + + def _handle_set_multi_variables(self, seq_num: int, session_id: int, request_data: bytes) -> bytes: + """Handle SetMultiVariables -- write variables to data blocks. + + Reference: thomas-v2/S7CommPlusDriver/Core/SetMultiVariablesRequest.cs + """ + response = bytearray() + response += struct.pack( + ">BHHHHIB", + Opcode.RESPONSE, + 0x0000, + FunctionCode.SET_MULTI_VARIABLES, + 0x0000, + seq_num, + session_id, + 0x00, + ) + + # Parse request payload + items, values = _server_parse_write_request(request_data) + + # Write data + errors: list[tuple[int, int]] = [] + for i, ((db_num, byte_offset, _), data) in enumerate(zip(items, values), 1): + db = self._data_blocks.get(db_num) + if db is not None: + db.write(byte_offset, data) + else: + errors.append((i, 0x8104)) # Object not found + + # ReturnValue: success + response += encode_uint64_vlq(0) + + # Error list + for err_item, err_code in errors: + response += encode_uint32_vlq(err_item) + response += encode_uint64_vlq(err_code) + + # Terminate error list + response += encode_uint32_vlq(0) + + # IntegrityId + response += encode_uint32_vlq(0) + + return bytes(response) + + def _build_error_response(self, seq_num: int, session_id: int, function_code: int) -> bytes: + """Build a generic error response for unsupported function codes.""" + response = bytearray() + response += struct.pack( + ">BHHHHIB", + Opcode.RESPONSE, + 0x0000, + FunctionCode.ERROR, + 0x0000, + seq_num, + session_id, + 0x00, + ) + response += encode_uint32_vlq(0x04B1) # Error function code + response += struct.pack(">I", 0) + return bytes(response) + + @staticmethod + def _recv_exact(sock: socket.socket, size: int) -> bytes: + """Receive exactly the specified number of bytes.""" + data = bytearray() + while len(data) < size: + chunk = sock.recv(size - len(data)) + if not chunk: + raise ConnectionError("Connection closed") + data.extend(chunk) + return bytes(data) + + def __enter__(self) -> "S7CommPlusServer": + return self + + def __exit__(self, *args: Any) -> None: + self.stop() + + +# -- Server-side request parsers -- + + +def _server_parse_read_request(request_data: bytes) -> list[tuple[int, int, int]]: + """Parse a GetMultiVariables request payload on the server side. + + Extracts (db_number, byte_offset, byte_size) for each item from the + S7CommPlus ItemAddress format. + + Returns: + List of (db_number, byte_offset, byte_size) tuples + """ + if not request_data: + return [] + + offset = 0 + items: list[tuple[int, int, int]] = [] + + # LinkId (UInt32 fixed) + if offset + 4 > len(request_data): + return [] + offset += 4 + + # ItemCount (VLQ) + item_count, consumed = decode_uint32_vlq(request_data, offset) + offset += consumed + + # FieldCount (VLQ) + _field_count, consumed = decode_uint32_vlq(request_data, offset) + offset += consumed + + # Parse each ItemAddress + for _ in range(item_count): + if offset >= len(request_data): + break + + # SymbolCrc + _symbol_crc, consumed = decode_uint32_vlq(request_data, offset) + offset += consumed + + # AccessArea + access_area, consumed = decode_uint32_vlq(request_data, offset) + offset += consumed + + # NumberOfLIDs + num_lids, consumed = decode_uint32_vlq(request_data, offset) + offset += consumed + + # AccessSubArea (first LID) + _access_sub_area, consumed = decode_uint32_vlq(request_data, offset) + offset += consumed + + # Additional LIDs + lids: list[int] = [] + for _ in range(num_lids - 1): # -1 because AccessSubArea counts as one + if offset >= len(request_data): + break + lid_val, consumed = decode_uint32_vlq(request_data, offset) + offset += consumed + lids.append(lid_val) + + # Extract db_number from AccessArea + db_num = access_area & 0xFFFF + + # Extract byte offset and size from LIDs (LID offsets are 1-based) + byte_offset = (lids[0] - 1) if len(lids) > 0 else 0 + byte_size = lids[1] if len(lids) > 1 else 1 + + items.append((db_num, byte_offset, byte_size)) + + return items + + +def _server_parse_write_request(request_data: bytes) -> tuple[list[tuple[int, int, int]], list[bytes]]: + """Parse a SetMultiVariables request payload on the server side. + + Returns: + Tuple of (items, values) where items is list of (db_number, byte_offset, byte_size) + and values is list of raw bytes to write + """ + if not request_data: + return [], [] + + offset = 0 + + # InObjectId (UInt32 fixed) + if offset + 4 > len(request_data): + return [], [] + offset += 4 + + # ItemCount (VLQ) + item_count, consumed = decode_uint32_vlq(request_data, offset) + offset += consumed + + # FieldCount (VLQ) + _field_count, consumed = decode_uint32_vlq(request_data, offset) + offset += consumed + + # Parse each ItemAddress + items: list[tuple[int, int, int]] = [] + for _ in range(item_count): + if offset >= len(request_data): + break + + # SymbolCrc + _symbol_crc, consumed = decode_uint32_vlq(request_data, offset) + offset += consumed + + # AccessArea + access_area, consumed = decode_uint32_vlq(request_data, offset) + offset += consumed + + # NumberOfLIDs + num_lids, consumed = decode_uint32_vlq(request_data, offset) + offset += consumed + + # AccessSubArea + _access_sub_area, consumed = decode_uint32_vlq(request_data, offset) + offset += consumed + + # Additional LIDs + lids: list[int] = [] + for _ in range(num_lids - 1): + if offset >= len(request_data): + break + lid_val, consumed = decode_uint32_vlq(request_data, offset) + offset += consumed + lids.append(lid_val) + + db_num = access_area & 0xFFFF + byte_offset = (lids[0] - 1) if len(lids) > 0 else 0 # LID offsets are 1-based + byte_size = lids[1] if len(lids) > 1 else 1 + items.append((db_num, byte_offset, byte_size)) + + # Parse value list: ItemNumber (VLQ, 1-based) + PValue + values: list[bytes] = [] + for _ in range(item_count): + if offset >= len(request_data): + break + item_nr, consumed = decode_uint32_vlq(request_data, offset) + offset += consumed + if item_nr == 0: + break + raw_bytes, consumed = decode_pvalue_to_bytes(request_data, offset) + offset += consumed + values.append(raw_bytes) + + return items, values diff --git a/snap7/s7commplus/vlq.py b/snap7/s7commplus/vlq.py new file mode 100644 index 00000000..19e9c388 --- /dev/null +++ b/snap7/s7commplus/vlq.py @@ -0,0 +1,338 @@ +""" +Variable-Length Quantity (VLQ) encoding for S7CommPlus. + +S7CommPlus uses VLQ encoding for integer values in the protocol framing. +This is similar to MIDI VLQ or protobuf varints, with some S7-specific +variations for signed values and 64-bit special handling. + +Encoding scheme: + - Each byte uses 7 data bits + 1 continuation bit (MSB) + - continuation bit = 1 means more bytes follow + - continuation bit = 0 means this is the last byte + - Big-endian byte order (most significant group first) + - Signed values use bit 6 of the first byte as a sign flag + +64-bit special case: + - 8 bytes of 7-bit groups = 56 bits, which is less than 64 + - The 9th byte uses all 8 bits (no continuation flag) + - This avoids needing a 10th byte + +Reference: thomas-v2/S7CommPlusDriver/Core/S7p.cs +""" + + +def encode_uint32_vlq(value: int) -> bytes: + """Encode an unsigned 32-bit integer as VLQ. + + Args: + value: Unsigned integer (0 to 2^32-1) + + Returns: + VLQ-encoded bytes (1-5 bytes) + """ + if value < 0 or value > 0xFFFFFFFF: + raise ValueError(f"Value out of range for uint32 VLQ: {value}") + + result = bytearray() + + # Find the highest non-zero 7-bit group + num_groups = 1 + for i in range(4, 0, -1): + if value & (0x7F << (i * 7)): + num_groups = i + 1 + break + + # Encode each group, MSB first + for i in range(num_groups - 1, -1, -1): + group = (value >> (i * 7)) & 0x7F + if i > 0: + group |= 0x80 # Set continuation bit + result.append(group) + + return bytes(result) + + +def decode_uint32_vlq(data: bytes, offset: int = 0) -> tuple[int, int]: + """Decode a VLQ-encoded unsigned 32-bit integer. + + Args: + data: Buffer containing VLQ data + offset: Starting position in buffer + + Returns: + Tuple of (decoded_value, bytes_consumed) + """ + value = 0 + consumed = 0 + + for _ in range(5): # Max 5 bytes for 32-bit + if offset + consumed >= len(data): + raise ValueError("Unexpected end of VLQ data") + + octet = data[offset + consumed] + consumed += 1 + + value = (value << 7) | (octet & 0x7F) + + if not (octet & 0x80): # No continuation bit + break + + return value, consumed + + +def encode_int32_vlq(value: int) -> bytes: + """Encode a signed 32-bit integer as VLQ. + + Signed VLQ uses bit 6 of the first byte as a sign indicator. + Negative values are encoded in a compact two's-complement-like form. + + Args: + value: Signed integer (-2^31 to 2^31-1) + + Returns: + VLQ-encoded bytes (1-5 bytes) + """ + if value < -0x80000000 or value > 0x7FFFFFFF: + raise ValueError(f"Value out of range for int32 VLQ: {value}") + + result = bytearray() + + if value == -0x80000000: + abs_v = 0x80000000 + else: + abs_v = abs(value) + + b = [0] * 5 + b[0] = value & 0x7F + length = 1 + + for i in range(1, 5): + if abs_v >= 0x40: + length += 1 + abs_v >>= 7 + value >>= 7 + b[i] = ((value & 0x7F) + 0x80) & 0xFF + else: + break + + # Emit in reverse order (big-endian) + for i in range(length - 1, -1, -1): + result.append(b[i]) + + return bytes(result) + + +def decode_int32_vlq(data: bytes, offset: int = 0) -> tuple[int, int]: + """Decode a VLQ-encoded signed 32-bit integer. + + Args: + data: Buffer containing VLQ data + offset: Starting position in buffer + + Returns: + Tuple of (decoded_value, bytes_consumed) + """ + value = 0 + consumed = 0 + + for counter in range(1, 6): # Max 5 bytes for 32-bit + if offset + consumed >= len(data): + raise ValueError("Unexpected end of VLQ data") + + octet = data[offset + consumed] + consumed += 1 + + if counter == 1 and (octet & 0x40): # Check sign bit + octet &= 0xBF + value = -64 # Pre-load with one's complement + else: + value <<= 7 + + value += octet & 0x7F + + if not (octet & 0x80): # No continuation bit + break + + return value, consumed + + +def encode_uint64_vlq(value: int) -> bytes: + """Encode an unsigned 64-bit integer as VLQ. + + 64-bit VLQ has special handling: since 8 groups of 7 bits = 56 bits < 64, + the 9th byte uses all 8 bits (no continuation flag). + + Args: + value: Unsigned integer (0 to 2^64-1) + + Returns: + VLQ-encoded bytes (1-9 bytes) + """ + if value < 0 or value > 0xFFFFFFFFFFFFFFFF: + raise ValueError(f"Value out of range for uint64 VLQ: {value}") + + special = value > 0x00FFFFFFFFFFFFFF + + b = [0] * 9 + if special: + b[0] = value & 0xFF + else: + b[0] = value & 0x7F + + length = 1 + for i in range(1, 9): + if value >= 0x80: + length += 1 + if i == 1 and special: + value >>= 8 + else: + value >>= 7 + b[i] = ((value & 0x7F) + 0x80) & 0xFF + else: + break + + if special and length == 8: + length += 1 + b[8] = 0x80 + + # Emit in reverse order + result = bytearray() + for i in range(length - 1, -1, -1): + result.append(b[i]) + + return bytes(result) + + +def decode_uint64_vlq(data: bytes, offset: int = 0) -> tuple[int, int]: + """Decode a VLQ-encoded unsigned 64-bit integer. + + Args: + data: Buffer containing VLQ data + offset: Starting position in buffer + + Returns: + Tuple of (decoded_value, bytes_consumed) + """ + value = 0 + consumed = 0 + cont = 0 + + for counter in range(1, 9): # Max 8 groups of 7 bits + if offset + consumed >= len(data): + raise ValueError("Unexpected end of VLQ data") + + octet = data[offset + consumed] + consumed += 1 + + value = (value << 7) | (octet & 0x7F) + cont = octet & 0x80 + + if not cont: + break + + if cont: + # 9th byte: all 8 bits are data (special 64-bit handling) + if offset + consumed >= len(data): + raise ValueError("Unexpected end of VLQ data") + + octet = data[offset + consumed] + consumed += 1 + value = (value << 8) | octet + + return value, consumed + + +def encode_int64_vlq(value: int) -> bytes: + """Encode a signed 64-bit integer as VLQ. + + Args: + value: Signed integer (-2^63 to 2^63-1) + + Returns: + VLQ-encoded bytes (1-9 bytes) + """ + if value < -0x8000000000000000 or value > 0x7FFFFFFFFFFFFFFF: + raise ValueError(f"Value out of range for int64 VLQ: {value}") + + if value == -0x8000000000000000: + abs_v = 0x8000000000000000 + else: + abs_v = abs(value) + + special = abs_v > 0x007FFFFFFFFFFFFF + + b = [0] * 9 + if special: + b[0] = value & 0xFF + else: + b[0] = value & 0x7F + + length = 1 + for i in range(1, 9): + if abs_v >= 0x40: + length += 1 + if i == 1 and special: + abs_v >>= 8 + value >>= 8 + else: + abs_v >>= 7 + value >>= 7 + b[i] = ((value & 0x7F) + 0x80) & 0xFF + else: + break + + if special and length == 8: + length += 1 + b[8] = 0x80 if value >= 0 else 0xFF + + # Emit in reverse order + result = bytearray() + for i in range(length - 1, -1, -1): + result.append(b[i]) + + return bytes(result) + + +def decode_int64_vlq(data: bytes, offset: int = 0) -> tuple[int, int]: + """Decode a VLQ-encoded signed 64-bit integer. + + Args: + data: Buffer containing VLQ data + offset: Starting position in buffer + + Returns: + Tuple of (decoded_value, bytes_consumed) + """ + value = 0 + consumed = 0 + cont = 0 + + for counter in range(1, 9): # Max 8 groups of 7 bits + if offset + consumed >= len(data): + raise ValueError("Unexpected end of VLQ data") + + octet = data[offset + consumed] + consumed += 1 + + if counter == 1 and (octet & 0x40): # Check sign bit + octet &= 0xBF + value = -64 # Pre-load with one's complement + else: + value <<= 7 + + cont = octet & 0x80 + value += octet & 0x7F + + if not cont: + break + + if cont: + # 9th byte: all 8 bits are data + if offset + consumed >= len(data): + raise ValueError("Unexpected end of VLQ data") + + octet = data[offset + consumed] + consumed += 1 + value = (value << 8) | octet + + return value, consumed diff --git a/tests/conftest.py b/tests/conftest.py index c0e3eac1..4e53e6d3 100644 --- a/tests/conftest.py +++ b/tests/conftest.py @@ -65,8 +65,13 @@ def pytest_configure(config: pytest.Config) -> None: def pytest_collection_modifyitems(config: pytest.Config, items: list[pytest.Item]) -> None: """Propagate CLI options and skip e2e tests unless --e2e flag is provided.""" - # Propagate CLI options to test_client_e2e module globals - for mod_name in ["tests.test_client_e2e", "test_client_e2e"]: + # Propagate CLI options to e2e test module globals + for mod_name in [ + "tests.test_client_e2e", + "test_client_e2e", + "tests.test_s7commplus_e2e", + "test_s7commplus_e2e", + ]: e2e = sys.modules.get(mod_name) if e2e is not None: e2e.PLC_IP = str(config.getoption("--plc-ip")) @@ -75,7 +80,6 @@ def pytest_collection_modifyitems(config: pytest.Config, items: list[pytest.Item e2e.PLC_PORT = int(config.getoption("--plc-port")) e2e.DB_READ_ONLY = int(config.getoption("--plc-db-read")) e2e.DB_READ_WRITE = int(config.getoption("--plc-db-write")) - break # Skip e2e tests if flag not provided if config.getoption("--e2e"): diff --git a/tests/test_s7commplus_codec.py b/tests/test_s7commplus_codec.py new file mode 100644 index 00000000..84a3212f --- /dev/null +++ b/tests/test_s7commplus_codec.py @@ -0,0 +1,173 @@ +"""Tests for S7CommPlus codec (header encoding, typed values).""" + +import struct +import pytest + +from snap7.s7commplus.codec import ( + encode_header, + decode_header, + encode_request_header, + decode_response_header, + encode_typed_value, + encode_uint16, + decode_uint16, + encode_uint32, + decode_uint32, + encode_float32, + decode_float32, + encode_float64, + decode_float64, + encode_wstring, + decode_wstring, +) +from snap7.s7commplus.protocol import PROTOCOL_ID, DataType, Opcode, FunctionCode + + +class TestFrameHeader: + def test_encode_header(self) -> None: + header = encode_header(version=0x03, data_length=100) + assert len(header) == 4 + assert header[0] == PROTOCOL_ID + assert header[1] == 0x03 + assert struct.unpack(">H", header[2:4])[0] == 100 + + def test_decode_header(self) -> None: + header = encode_header(version=0x03, data_length=256) + version, length, consumed = decode_header(header) + assert version == 0x03 + assert length == 256 + assert consumed == 4 + + def test_decode_header_with_offset(self) -> None: + prefix = bytes([0x00, 0x00]) + header = encode_header(version=0x01, data_length=42) + version, length, consumed = decode_header(prefix + header, offset=2) + assert version == 0x01 + assert length == 42 + + def test_decode_header_wrong_protocol_id(self) -> None: + bad_header = bytes([0x32, 0x03, 0x00, 0x10]) # S7comm ID, not S7CommPlus + with pytest.raises(ValueError, match="Invalid protocol ID"): + decode_header(bad_header) + + def test_decode_header_too_short(self) -> None: + with pytest.raises(ValueError, match="Not enough data"): + decode_header(bytes([0x72, 0x03])) + + +class TestRequestHeader: + def test_encode_request_header(self) -> None: + header = encode_request_header( + function_code=FunctionCode.CREATE_OBJECT, + sequence_number=1, + session_id=0, + transport_flags=0x36, + ) + assert len(header) == 14 + assert header[0] == Opcode.REQUEST + + def test_roundtrip_request_response_header(self) -> None: + header = encode_request_header( + function_code=FunctionCode.GET_MULTI_VARIABLES, + sequence_number=42, + session_id=0x12345678, + ) + result = decode_response_header(header) + assert result["function_code"] == FunctionCode.GET_MULTI_VARIABLES + assert result["sequence_number"] == 42 + assert result["session_id"] == 0x12345678 + assert result["bytes_consumed"] == 14 + + +class TestFixedWidth: + def test_uint16_roundtrip(self) -> None: + for val in [0, 1, 0xFF, 0xFFFF]: + encoded = encode_uint16(val) + decoded, consumed = decode_uint16(encoded) + assert decoded == val + assert consumed == 2 + + def test_uint32_roundtrip(self) -> None: + for val in [0, 1, 0xFFFF, 0xFFFFFFFF]: + encoded = encode_uint32(val) + decoded, consumed = decode_uint32(encoded) + assert decoded == val + assert consumed == 4 + + def test_float32_roundtrip(self) -> None: + for val in [0.0, 1.0, -1.0, 3.14]: + encoded = encode_float32(val) + decoded, consumed = decode_float32(encoded) + assert abs(decoded - val) < 1e-6 + assert consumed == 4 + + def test_float64_roundtrip(self) -> None: + for val in [0.0, 1.0, -1.0, 3.141592653589793]: + encoded = encode_float64(val) + decoded, consumed = decode_float64(encoded) + assert decoded == val + assert consumed == 8 + + +class TestWString: + def test_ascii(self) -> None: + encoded = encode_wstring("hello") + decoded, consumed = decode_wstring(encoded, 0, len(encoded)) + assert decoded == "hello" + + def test_unicode(self) -> None: + encoded = encode_wstring("Ölprüfung") + decoded, consumed = decode_wstring(encoded, 0, len(encoded)) + assert decoded == "Ölprüfung" + + def test_empty(self) -> None: + encoded = encode_wstring("") + assert encoded == b"" + decoded, consumed = decode_wstring(encoded, 0, 0) + assert decoded == "" + + +class TestTypedValue: + def test_null(self) -> None: + encoded = encode_typed_value(DataType.NULL, None) + assert encoded == bytes([DataType.NULL]) + + def test_bool_true(self) -> None: + encoded = encode_typed_value(DataType.BOOL, True) + assert encoded == bytes([DataType.BOOL, 0x01]) + + def test_bool_false(self) -> None: + encoded = encode_typed_value(DataType.BOOL, False) + assert encoded == bytes([DataType.BOOL, 0x00]) + + def test_usint(self) -> None: + encoded = encode_typed_value(DataType.USINT, 42) + assert encoded == bytes([DataType.USINT, 42]) + + def test_uint(self) -> None: + encoded = encode_typed_value(DataType.UINT, 0x1234) + assert encoded == bytes([DataType.UINT]) + struct.pack(">H", 0x1234) + + def test_real(self) -> None: + encoded = encode_typed_value(DataType.REAL, 1.0) + assert encoded == bytes([DataType.REAL]) + struct.pack(">f", 1.0) + + def test_lreal(self) -> None: + encoded = encode_typed_value(DataType.LREAL, 3.14) + assert encoded == bytes([DataType.LREAL]) + struct.pack(">d", 3.14) + + def test_wstring(self) -> None: + encoded = encode_typed_value(DataType.WSTRING, "test") + assert encoded[0] == DataType.WSTRING + # Should contain VLQ length + UTF-8 data + assert b"test" in encoded + + def test_blob(self) -> None: + data = bytes([1, 2, 3, 4]) + encoded = encode_typed_value(DataType.BLOB, data) + assert encoded[0] == DataType.BLOB + assert encoded.endswith(data) + + def test_unsupported_type(self) -> None: + with pytest.raises(ValueError, match="Unsupported DataType"): + encode_typed_value(0xFF, None) diff --git a/tests/test_s7commplus_e2e.py b/tests/test_s7commplus_e2e.py new file mode 100644 index 00000000..f8c8bf0d --- /dev/null +++ b/tests/test_s7commplus_e2e.py @@ -0,0 +1,607 @@ +"""End-to-end tests for S7CommPlus client against a real Siemens S7-1200/1500 PLC. + +These tests require a real PLC connection. Run with: + + pytest tests/test_s7commplus_e2e.py --e2e --plc-ip=YOUR_PLC_IP + +Available options: + --e2e Enable e2e tests (required) + --plc-ip PLC IP address (default: 10.10.10.100) + --plc-rack PLC rack number (default: 0) + --plc-slot PLC slot number (default: 1) + --plc-port PLC TCP port (default: 102) + --plc-db-read Read-only DB number (default: 1) + --plc-db-write Read-write DB number (default: 2) + +The PLC needs two data blocks configured with the same layout as the +regular S7 e2e tests: + +DB1 "Read_only" - Read-only data block with predefined values: + int1: Int = 10 (offset 0, 2 bytes) + int2: Int = 255 (offset 2, 2 bytes) + float1: Real = 123.45 (offset 4, 4 bytes) + float2: Real = 543.21 (offset 8, 4 bytes) + byte1: Byte = 0x0F (offset 12, 1 byte) + byte2: Byte = 0xF0 (offset 13, 1 byte) + word1: Word = 0xABCD (offset 14, 2 bytes) + word2: Word = 0x1234 (offset 16, 2 bytes) + dword1: DWord = 0x12345678 (offset 18, 4 bytes) + dword2: DWord = 0x89ABCDEF (offset 22, 4 bytes) + dint1: DInt = 2147483647 (offset 26, 4 bytes) + dint2: DInt = 42 (offset 30, 4 bytes) + char1: Char = 'F' (offset 34, 1 byte) + char2: Char = '-' (offset 35, 1 byte) + bool0-bool7: Bool (offset 36, 1 byte, value: 0x01) + +DB2 "Data_block_2" - Read/write data block with same structure. + +Note: S7CommPlus targets S7-1200/1500 PLCs, which use optimized block +access. Ensure data blocks have "Optimized block access" disabled in +TIA Portal so that byte offsets match the layout above. +""" + +import logging +import os +import struct +import unittest + +import pytest + +from snap7.s7commplus.client import S7CommPlusClient + +# Enable DEBUG logging for all s7commplus modules so we get full hex dumps +logging.basicConfig( + level=logging.DEBUG, + format="%(asctime)s %(name)s %(levelname)s %(message)s", +) +for _mod in ["snap7.s7commplus.client", "snap7.s7commplus.connection", "snap7.connection"]: + logging.getLogger(_mod).setLevel(logging.DEBUG) + +# ============================================================================= +# PLC Connection Configuration +# These can be overridden via pytest command line options or environment variables +# ============================================================================= +PLC_IP = os.environ.get("PLC_IP", "10.10.10.100") +PLC_RACK = int(os.environ.get("PLC_RACK", "0")) +PLC_SLOT = int(os.environ.get("PLC_SLOT", "1")) +PLC_PORT = int(os.environ.get("PLC_PORT", "102")) + +# Data block numbers +DB_READ_ONLY = int(os.environ.get("PLC_DB_READ", "1")) +DB_READ_WRITE = int(os.environ.get("PLC_DB_WRITE", "2")) + + +# ============================================================================= +# DB Structure - Byte offsets for each variable (same as regular S7 e2e tests) +# ============================================================================= +OFFSET_INT1 = 0 # Int (2 bytes) +OFFSET_INT2 = 2 # Int (2 bytes) +OFFSET_FLOAT1 = 4 # Real (4 bytes) +OFFSET_FLOAT2 = 8 # Real (4 bytes) +OFFSET_BYTE1 = 12 # Byte (1 byte) +OFFSET_BYTE2 = 13 # Byte (1 byte) +OFFSET_WORD1 = 14 # Word (2 bytes) +OFFSET_WORD2 = 16 # Word (2 bytes) +OFFSET_DWORD1 = 18 # DWord (4 bytes) +OFFSET_DWORD2 = 22 # DWord (4 bytes) +OFFSET_DINT1 = 26 # DInt (4 bytes) +OFFSET_DINT2 = 30 # DInt (4 bytes) +OFFSET_CHAR1 = 34 # Char (1 byte) +OFFSET_CHAR2 = 35 # Char (1 byte) +OFFSET_BOOLS = 36 # 8 Bools packed in 1 byte + +# Total size of DB +DB_SIZE = 37 + +# ============================================================================= +# Expected values from DB1 "Read_only" +# ============================================================================= +EXPECTED_INT1 = 10 +EXPECTED_INT2 = 255 +EXPECTED_FLOAT1 = 123.45 +EXPECTED_FLOAT2 = 543.21 +EXPECTED_BYTE1 = 0x0F +EXPECTED_BYTE2 = 0xF0 +EXPECTED_WORD1 = 0xABCD +EXPECTED_WORD2 = 0x1234 +EXPECTED_DWORD1 = 0x12345678 +EXPECTED_DWORD2 = 0x89ABCDEF +EXPECTED_DINT1 = 2147483647 +EXPECTED_DINT2 = 42 +EXPECTED_CHAR1 = "F" +EXPECTED_CHAR2 = "-" +EXPECTED_BOOL0 = True +EXPECTED_BOOL1 = False + + +# ============================================================================= +# Test Classes +# ============================================================================= + + +@pytest.mark.e2e +class TestS7CommPlusConnection(unittest.TestCase): + """Tests for S7CommPlus connection.""" + + def test_connect_disconnect(self) -> None: + """Test connect() and disconnect().""" + client = S7CommPlusClient() + client.connect(PLC_IP, PLC_PORT, PLC_RACK, PLC_SLOT) + self.assertTrue(client.connected) + self.assertGreater(client.protocol_version, 0) + self.assertGreater(client.session_id, 0) + client.disconnect() + self.assertFalse(client.connected) + + def test_context_manager(self) -> None: + """Test S7CommPlusClient as context manager.""" + with S7CommPlusClient() as client: + client.connect(PLC_IP, PLC_PORT, PLC_RACK, PLC_SLOT) + self.assertTrue(client.connected) + # After exiting context, client should be disconnected + + def test_properties_before_connect(self) -> None: + """Test properties return defaults before connection.""" + client = S7CommPlusClient() + self.assertFalse(client.connected) + self.assertEqual(0, client.protocol_version) + self.assertEqual(0, client.session_id) + + +@pytest.mark.e2e +class TestS7CommPlusDBRead(unittest.TestCase): + """Tests for db_read() - reading from DB1 (read-only).""" + + client: S7CommPlusClient + + @classmethod + def setUpClass(cls) -> None: + cls.client = S7CommPlusClient() + cls.client.connect(PLC_IP, PLC_PORT, PLC_RACK, PLC_SLOT) + + @classmethod + def tearDownClass(cls) -> None: + if cls.client: + cls.client.disconnect() + + def test_db_read_int(self) -> None: + """Test db_read() for Int values.""" + data = self.client.db_read(DB_READ_ONLY, OFFSET_INT1, 2) + value = struct.unpack(">h", data)[0] + self.assertEqual(EXPECTED_INT1, value) + + data = self.client.db_read(DB_READ_ONLY, OFFSET_INT2, 2) + value = struct.unpack(">h", data)[0] + self.assertEqual(EXPECTED_INT2, value) + + def test_db_read_real(self) -> None: + """Test db_read() for Real values.""" + data = self.client.db_read(DB_READ_ONLY, OFFSET_FLOAT1, 4) + value = struct.unpack(">f", data)[0] + self.assertAlmostEqual(EXPECTED_FLOAT1, value, places=2) + + data = self.client.db_read(DB_READ_ONLY, OFFSET_FLOAT2, 4) + value = struct.unpack(">f", data)[0] + self.assertAlmostEqual(EXPECTED_FLOAT2, value, places=2) + + def test_db_read_byte(self) -> None: + """Test db_read() for Byte values.""" + data = self.client.db_read(DB_READ_ONLY, OFFSET_BYTE1, 1) + self.assertEqual(EXPECTED_BYTE1, data[0]) + + data = self.client.db_read(DB_READ_ONLY, OFFSET_BYTE2, 1) + self.assertEqual(EXPECTED_BYTE2, data[0]) + + def test_db_read_word(self) -> None: + """Test db_read() for Word values.""" + data = self.client.db_read(DB_READ_ONLY, OFFSET_WORD1, 2) + value = struct.unpack(">H", data)[0] + self.assertEqual(EXPECTED_WORD1, value) + + data = self.client.db_read(DB_READ_ONLY, OFFSET_WORD2, 2) + value = struct.unpack(">H", data)[0] + self.assertEqual(EXPECTED_WORD2, value) + + def test_db_read_dword(self) -> None: + """Test db_read() for DWord values.""" + data = self.client.db_read(DB_READ_ONLY, OFFSET_DWORD1, 4) + value = struct.unpack(">I", data)[0] + self.assertEqual(EXPECTED_DWORD1, value) + + data = self.client.db_read(DB_READ_ONLY, OFFSET_DWORD2, 4) + value = struct.unpack(">I", data)[0] + self.assertEqual(EXPECTED_DWORD2, value) + + def test_db_read_dint(self) -> None: + """Test db_read() for DInt values.""" + data = self.client.db_read(DB_READ_ONLY, OFFSET_DINT1, 4) + value = struct.unpack(">i", data)[0] + self.assertEqual(EXPECTED_DINT1, value) + + data = self.client.db_read(DB_READ_ONLY, OFFSET_DINT2, 4) + value = struct.unpack(">i", data)[0] + self.assertEqual(EXPECTED_DINT2, value) + + def test_db_read_char(self) -> None: + """Test db_read() for Char values.""" + data = self.client.db_read(DB_READ_ONLY, OFFSET_CHAR1, 1) + self.assertEqual(EXPECTED_CHAR1, chr(data[0])) + + data = self.client.db_read(DB_READ_ONLY, OFFSET_CHAR2, 1) + self.assertEqual(EXPECTED_CHAR2, chr(data[0])) + + def test_db_read_bool(self) -> None: + """Test db_read() for Bool values (packed in byte).""" + data = self.client.db_read(DB_READ_ONLY, OFFSET_BOOLS, 1) + self.assertEqual(EXPECTED_BOOL0, bool(data[0] & 0x01)) + self.assertEqual(EXPECTED_BOOL1, bool(data[0] & 0x02)) + + def test_db_read_entire_block(self) -> None: + """Test db_read() for entire DB.""" + data = self.client.db_read(DB_READ_ONLY, 0, DB_SIZE) + self.assertEqual(DB_SIZE, len(data)) + + # Verify a few values + int1 = struct.unpack(">h", data[OFFSET_INT1 : OFFSET_INT1 + 2])[0] + self.assertEqual(EXPECTED_INT1, int1) + + float1 = struct.unpack(">f", data[OFFSET_FLOAT1 : OFFSET_FLOAT1 + 4])[0] + self.assertAlmostEqual(EXPECTED_FLOAT1, float1, places=2) + + dword1 = struct.unpack(">I", data[OFFSET_DWORD1 : OFFSET_DWORD1 + 4])[0] + self.assertEqual(EXPECTED_DWORD1, dword1) + + +@pytest.mark.e2e +class TestS7CommPlusDBWrite(unittest.TestCase): + """Tests for db_write() - writing to DB2 (read/write).""" + + client: S7CommPlusClient + + @classmethod + def setUpClass(cls) -> None: + cls.client = S7CommPlusClient() + cls.client.connect(PLC_IP, PLC_PORT, PLC_RACK, PLC_SLOT) + + @classmethod + def tearDownClass(cls) -> None: + if cls.client: + cls.client.disconnect() + + def test_db_write_int(self) -> None: + """Test db_write() for Int values.""" + test_value = 10 + data = struct.pack(">h", test_value) + self.client.db_write(DB_READ_WRITE, OFFSET_INT1, data) + + result = self.client.db_read(DB_READ_WRITE, OFFSET_INT1, 2) + self.assertEqual(test_value, struct.unpack(">h", result)[0]) + + def test_db_write_real(self) -> None: + """Test db_write() for Real values.""" + test_value = 456.789 + data = struct.pack(">f", test_value) + self.client.db_write(DB_READ_WRITE, OFFSET_FLOAT1, data) + + result = self.client.db_read(DB_READ_WRITE, OFFSET_FLOAT1, 4) + self.assertAlmostEqual(test_value, struct.unpack(">f", result)[0], places=2) + + def test_db_write_byte(self) -> None: + """Test db_write() for Byte values.""" + test_value = 0xAB + self.client.db_write(DB_READ_WRITE, OFFSET_BYTE1, bytes([test_value])) + + result = self.client.db_read(DB_READ_WRITE, OFFSET_BYTE1, 1) + self.assertEqual(test_value, result[0]) + + def test_db_write_word(self) -> None: + """Test db_write() for Word values.""" + test_value = 0x1234 + data = struct.pack(">H", test_value) + self.client.db_write(DB_READ_WRITE, OFFSET_WORD1, data) + + result = self.client.db_read(DB_READ_WRITE, OFFSET_WORD1, 2) + self.assertEqual(test_value, struct.unpack(">H", result)[0]) + + def test_db_write_dword(self) -> None: + """Test db_write() for DWord values.""" + test_value = 0xDEADBEEF + data = struct.pack(">I", test_value) + self.client.db_write(DB_READ_WRITE, OFFSET_DWORD1, data) + + result = self.client.db_read(DB_READ_WRITE, OFFSET_DWORD1, 4) + self.assertEqual(test_value, struct.unpack(">I", result)[0]) + + def test_db_write_dint(self) -> None: + """Test db_write() for DInt values.""" + test_value = -123456789 + data = struct.pack(">i", test_value) + self.client.db_write(DB_READ_WRITE, OFFSET_DINT1, data) + + result = self.client.db_read(DB_READ_WRITE, OFFSET_DINT1, 4) + self.assertEqual(test_value, struct.unpack(">i", result)[0]) + + def test_db_write_char(self) -> None: + """Test db_write() for Char values.""" + test_value = "X" + self.client.db_write(DB_READ_WRITE, OFFSET_CHAR1, test_value.encode("ascii")) + + result = self.client.db_read(DB_READ_WRITE, OFFSET_CHAR1, 1) + self.assertEqual(test_value, chr(result[0])) + + def test_db_write_bool(self) -> None: + """Test db_write() for Bool values (packed in byte).""" + # Read current byte, set bit 0 and bit 7, write back + data = bytearray(self.client.db_read(DB_READ_WRITE, OFFSET_BOOLS, 1)) + data[0] = data[0] | 0x01 | 0x80 # Set bit 0 and bit 7 + self.client.db_write(DB_READ_WRITE, OFFSET_BOOLS, bytes(data)) + + result = self.client.db_read(DB_READ_WRITE, OFFSET_BOOLS, 1) + self.assertTrue(bool(result[0] & 0x01)) + self.assertTrue(bool(result[0] & 0x80)) + + +@pytest.mark.e2e +class TestS7CommPlusMultiRead(unittest.TestCase): + """Tests for db_read_multi() - multiple reads in a single request.""" + + client: S7CommPlusClient + + @classmethod + def setUpClass(cls) -> None: + cls.client = S7CommPlusClient() + cls.client.connect(PLC_IP, PLC_PORT, PLC_RACK, PLC_SLOT) + + @classmethod + def tearDownClass(cls) -> None: + if cls.client: + cls.client.disconnect() + + def test_multi_read(self) -> None: + """Test db_read_multi() reads multiple regions.""" + items = [ + (DB_READ_ONLY, OFFSET_INT1, 2), + (DB_READ_ONLY, OFFSET_FLOAT1, 4), + (DB_READ_ONLY, OFFSET_DWORD1, 4), + ] + results = self.client.db_read_multi(items) + self.assertEqual(3, len(results)) + + int_val = struct.unpack(">h", results[0])[0] + self.assertEqual(EXPECTED_INT1, int_val) + + float_val = struct.unpack(">f", results[1])[0] + self.assertAlmostEqual(EXPECTED_FLOAT1, float_val, places=2) + + dword_val = struct.unpack(">I", results[2])[0] + self.assertEqual(EXPECTED_DWORD1, dword_val) + + def test_multi_read_across_dbs(self) -> None: + """Test db_read_multi() across different data blocks.""" + # Write a known value to DB2 first + test_int = 777 + self.client.db_write(DB_READ_WRITE, OFFSET_INT1, struct.pack(">h", test_int)) + + items = [ + (DB_READ_ONLY, OFFSET_INT1, 2), + (DB_READ_WRITE, OFFSET_INT1, 2), + ] + results = self.client.db_read_multi(items) + self.assertEqual(2, len(results)) + + self.assertEqual(EXPECTED_INT1, struct.unpack(">h", results[0])[0]) + self.assertEqual(test_int, struct.unpack(">h", results[1])[0]) + + +@pytest.mark.e2e +class TestS7CommPlusExplore(unittest.TestCase): + """Tests for explore() - browsing the PLC object tree.""" + + client: S7CommPlusClient + + @classmethod + def setUpClass(cls) -> None: + cls.client = S7CommPlusClient() + cls.client.connect(PLC_IP, PLC_PORT, PLC_RACK, PLC_SLOT) + + @classmethod + def tearDownClass(cls) -> None: + if cls.client: + cls.client.disconnect() + + def test_explore(self) -> None: + """Test explore() returns data.""" + try: + data = self.client.explore() + except Exception as e: + pytest.skip(f"Explore not supported: {e}") + self.assertIsInstance(data, bytes) + self.assertGreater(len(data), 0) + + +@pytest.mark.e2e +class TestS7CommPlusDiagnostics(unittest.TestCase): + """Diagnostic tests for debugging protocol issues against real PLCs. + + These tests are designed to dump raw protocol data at every layer + to help diagnose why db_read/db_write fail against real hardware. + """ + + client: S7CommPlusClient + + @classmethod + def setUpClass(cls) -> None: + cls.client = S7CommPlusClient() + cls.client.connect(PLC_IP, PLC_PORT, PLC_RACK, PLC_SLOT) + + @classmethod + def tearDownClass(cls) -> None: + if cls.client: + cls.client.disconnect() + + def test_diag_connection_info(self) -> None: + """Dump connection state after successful connect.""" + print(f"\n{'=' * 60}") + print("DIAGNOSTIC: Connection Info") + print(f" connected: {self.client.connected}") + print(f" protocol_version: V{self.client.protocol_version}") + print(f" session_id: 0x{self.client.session_id:08X} ({self.client.session_id})") + print(f"{'=' * 60}") + self.assertTrue(self.client.connected) + + def test_diag_explore_raw(self) -> None: + """Explore and dump the raw response for analysis.""" + print(f"\n{'=' * 60}") + print("DIAGNOSTIC: Explore raw response") + try: + data = self.client.explore() + print(f" Length: {len(data)} bytes") + # Dump in 32-byte rows + for i in range(0, len(data), 32): + chunk = data[i : i + 32] + hex_str = chunk.hex(" ") + ascii_str = "".join(chr(b) if 32 <= b < 127 else "." for b in chunk) + print(f" {i:04x}: {hex_str:<96s} {ascii_str}") + except Exception as e: + print(f" Explore failed: {e}") + print(f"{'=' * 60}") + + def test_diag_db_read_single_byte(self) -> None: + """Try to read a single byte from DB1 offset 0 and dump everything.""" + print(f"\n{'=' * 60}") + print("DIAGNOSTIC: db_read(DB1, offset=0, size=1)") + try: + data = self.client.db_read(DB_READ_ONLY, 0, 1) + print(f" Success! Got {len(data)} bytes: {data.hex(' ')}") + except Exception as e: + print(f" FAILED: {type(e).__name__}: {e}") + print(f"{'=' * 60}") + + def test_diag_db_read_full_block(self) -> None: + """Try to read the full test DB and dump everything.""" + print(f"\n{'=' * 60}") + print(f"DIAGNOSTIC: db_read(DB{DB_READ_ONLY}, offset=0, size={DB_SIZE})") + try: + data = self.client.db_read(DB_READ_ONLY, 0, DB_SIZE) + print(f" Success! Got {len(data)} bytes:") + for i in range(0, len(data), 16): + chunk = data[i : i + 16] + print(f" {i:04x}: {chunk.hex(' ')}") + except Exception as e: + print(f" FAILED: {type(e).__name__}: {e}") + print(f"{'=' * 60}") + + def test_diag_raw_get_multi_variables(self) -> None: + """Send a raw GetMultiVariables with different payload formats and dump responses. + + This tries several payload encodings to see which ones the PLC accepts. + """ + from snap7.s7commplus.protocol import FunctionCode + from snap7.s7commplus.vlq import encode_uint32_vlq + + print(f"\n{'=' * 60}") + print("DIAGNOSTIC: Raw GetMultiVariables payload experiments") + + assert self.client._connection is not None + + # Experiment 1: Our current format (item_count + object_id + offset + size) + payloads = { + "current_format (count=1, obj=0x00010001, off=0, sz=2)": ( + encode_uint32_vlq(1) + encode_uint32_vlq(0x00010001) + encode_uint32_vlq(0) + encode_uint32_vlq(2) + ), + "empty_payload": b"", + "just_zero": encode_uint32_vlq(0), + "single_vlq_1": encode_uint32_vlq(1), + } + + for label, payload in payloads.items(): + print(f"\n --- {label} ---") + print(f" Payload ({len(payload)} bytes): {payload.hex(' ')}") + try: + response = self.client._connection.send_request(FunctionCode.GET_MULTI_VARIABLES, payload) + print(f" Response ({len(response)} bytes): {response.hex(' ')}") + + # Try to parse return code + if len(response) > 0: + from snap7.s7commplus.vlq import decode_uint32_vlq + + rc, consumed = decode_uint32_vlq(response, 0) + print(f" Return code (VLQ): {rc} (0x{rc:X})") + remaining = response[consumed:] + if remaining: + print(f" After return code ({len(remaining)} bytes): {remaining.hex(' ')}") + except Exception as e: + print(f" EXCEPTION: {type(e).__name__}: {e}") + + print(f"\n{'=' * 60}") + + def test_diag_raw_set_variable(self) -> None: + """Try SetVariable (0x04F2) instead of SetMultiVariables to see if PLC responds differently.""" + from snap7.s7commplus.protocol import FunctionCode + + print(f"\n{'=' * 60}") + print("DIAGNOSTIC: Raw SetVariable / GetVariable experiments") + + assert self.client._connection is not None + + function_codes = { + "GET_VARIABLE (0x04FC)": FunctionCode.GET_VARIABLE, + "GET_MULTI_VARIABLES (0x054C)": FunctionCode.GET_MULTI_VARIABLES, + "SET_VARIABLE (0x04F2)": FunctionCode.SET_VARIABLE, + } + + # Simple payload: just try empty or minimal + for label, fc in function_codes.items(): + print(f"\n --- {label} with empty payload ---") + try: + response = self.client._connection.send_request(fc, b"") + print(f" Response ({len(response)} bytes): {response.hex(' ')}") + except Exception as e: + print(f" EXCEPTION: {type(e).__name__}: {e}") + + print(f"\n{'=' * 60}") + + def test_diag_explore_then_read(self) -> None: + """Explore first to discover object IDs, then try reading using those IDs.""" + from snap7.s7commplus.protocol import FunctionCode, ElementID + from snap7.s7commplus.vlq import encode_uint32_vlq, decode_uint32_vlq + + print(f"\n{'=' * 60}") + print("DIAGNOSTIC: Explore -> extract object IDs -> try reading") + + assert self.client._connection is not None + + try: + explore_data = self.client._connection.send_request(FunctionCode.EXPLORE, b"") + print(f" Explore response ({len(explore_data)} bytes)") + + # Scan for StartOfObject markers and extract relation IDs + object_ids = [] + i = 0 + while i < len(explore_data): + if explore_data[i] == ElementID.START_OF_OBJECT: + if i + 5 <= len(explore_data): + rel_id = struct.unpack_from(">I", explore_data, i + 1)[0] + object_ids.append(rel_id) + print(f" Found object at offset {i}: relation_id=0x{rel_id:08X}") + i += 5 + else: + i += 1 + + # Try reading using each discovered object ID + for obj_id in object_ids[:5]: # Limit to first 5 + print(f"\n --- Read using object_id=0x{obj_id:08X} ---") + payload = encode_uint32_vlq(1) + encode_uint32_vlq(obj_id) + encode_uint32_vlq(0) + encode_uint32_vlq(4) + try: + response = self.client._connection.send_request(FunctionCode.GET_MULTI_VARIABLES, payload) + print(f" Response ({len(response)} bytes): {response.hex(' ')}") + if len(response) > 0: + rc, consumed = decode_uint32_vlq(response, 0) + print(f" Return code: {rc} (0x{rc:X})") + except Exception as e: + print(f" EXCEPTION: {type(e).__name__}: {e}") + + except Exception as e: + print(f" Explore failed: {type(e).__name__}: {e}") + + print(f"\n{'=' * 60}") diff --git a/tests/test_s7commplus_server.py b/tests/test_s7commplus_server.py new file mode 100644 index 00000000..2f08f575 --- /dev/null +++ b/tests/test_s7commplus_server.py @@ -0,0 +1,304 @@ +"""Integration tests for S7CommPlus server, client, and async client.""" + +import struct +import time +from collections.abc import Generator + +import pytest +import asyncio + +from snap7.s7commplus.server import S7CommPlusServer, CPUState, DataBlock +from snap7.s7commplus.client import S7CommPlusClient +from snap7.s7commplus.async_client import S7CommPlusAsyncClient +from snap7.s7commplus.protocol import ProtocolVersion + +# Use a high port to avoid conflicts +TEST_PORT = 11120 + + +@pytest.fixture() +def server() -> Generator[S7CommPlusServer, None, None]: + """Create and start an S7CommPlus server with test data blocks.""" + srv = S7CommPlusServer() + + # Register DB1 with named variables + srv.register_db( + 1, + { + "temperature": ("Real", 0), + "pressure": ("Real", 4), + "running": ("Bool", 8), + "count": ("DInt", 10), + "name": ("Int", 14), + }, + ) + + # Register DB2 with raw data + srv.register_raw_db(2, bytearray(256)) + + # Pre-populate some values in DB1 + db1 = srv.get_db(1) + assert db1 is not None + struct.pack_into(">f", db1.data, 0, 23.5) # temperature + struct.pack_into(">f", db1.data, 4, 1.013) # pressure + db1.data[8] = 1 # running = True + struct.pack_into(">i", db1.data, 10, 42) # count + + srv.start(port=TEST_PORT) + time.sleep(0.1) # Let server start + + yield srv + + srv.stop() + + +class TestServer: + """Test the server emulator itself.""" + + def test_register_db(self) -> None: + srv = S7CommPlusServer() + db = srv.register_db(1, {"temp": ("Real", 0)}) + assert db.number == 1 + assert "temp" in db.variables + assert db.variables["temp"].byte_offset == 0 + + def test_register_raw_db(self) -> None: + srv = S7CommPlusServer() + data = bytearray(b"\x01\x02\x03\x04") + db = srv.register_raw_db(10, data) + assert db.read(0, 4) == b"\x01\x02\x03\x04" + + def test_cpu_state(self) -> None: + srv = S7CommPlusServer() + assert srv.cpu_state == CPUState.RUN + srv.cpu_state = CPUState.STOP + assert srv.cpu_state == CPUState.STOP + + def test_data_block_read_write(self) -> None: + db = DataBlock(1, 100) + db.write(0, b"\x01\x02\x03\x04") + assert db.read(0, 4) == b"\x01\x02\x03\x04" + + def test_data_block_named_variable(self) -> None: + db = DataBlock(1, 100) + db.add_variable("temp", "Real", 0) + db.write(0, struct.pack(">f", 42.0)) + wire_type, raw = db.read_variable("temp") + value = struct.unpack(">f", raw)[0] + assert abs(value - 42.0) < 0.001 + + def test_data_block_read_past_end(self) -> None: + db = DataBlock(1, 4) + db.write(0, b"\xff\xff\xff\xff") + # Read past end should pad with zeros + data = db.read(2, 4) + assert data == b"\xff\xff\x00\x00" + + def test_unknown_variable_type(self) -> None: + db = DataBlock(1, 100) + with pytest.raises(ValueError, match="Unknown type name"): + db.add_variable("bad", "NonExistentType", 0) + + +class TestClientServerIntegration: + """Test client against the server emulator.""" + + def test_connect_disconnect(self, server: S7CommPlusServer) -> None: + client = S7CommPlusClient() + client.connect("127.0.0.1", port=TEST_PORT) + assert client.connected + assert client.session_id != 0 + assert client.protocol_version == ProtocolVersion.V1 + client.disconnect() + assert not client.connected + + def test_context_manager(self, server: S7CommPlusServer) -> None: + with S7CommPlusClient() as client: + client.connect("127.0.0.1", port=TEST_PORT) + assert client.connected + assert not client.connected + + def test_read_real(self, server: S7CommPlusServer) -> None: + client = S7CommPlusClient() + client.connect("127.0.0.1", port=TEST_PORT) + try: + data = client.db_read(1, 0, 4) + value = struct.unpack(">f", data)[0] + assert abs(value - 23.5) < 0.001 + finally: + client.disconnect() + + def test_read_multiple_values(self, server: S7CommPlusServer) -> None: + client = S7CommPlusClient() + client.connect("127.0.0.1", port=TEST_PORT) + try: + # Read temperature and pressure + data = client.db_read(1, 0, 8) + temp = struct.unpack_from(">f", data, 0)[0] + pressure = struct.unpack_from(">f", data, 4)[0] + assert abs(temp - 23.5) < 0.001 + assert abs(pressure - 1.013) < 0.001 + finally: + client.disconnect() + + def test_write_and_read_back(self, server: S7CommPlusServer) -> None: + client = S7CommPlusClient() + client.connect("127.0.0.1", port=TEST_PORT) + try: + # Write a new temperature + client.db_write(1, 0, struct.pack(">f", 99.9)) + + # Read it back + data = client.db_read(1, 0, 4) + value = struct.unpack(">f", data)[0] + assert abs(value - 99.9) < 0.1 + finally: + client.disconnect() + + def test_write_dint(self, server: S7CommPlusServer) -> None: + client = S7CommPlusClient() + client.connect("127.0.0.1", port=TEST_PORT) + try: + # Write count + client.db_write(1, 10, struct.pack(">i", 12345)) + + # Read it back + data = client.db_read(1, 10, 4) + value = struct.unpack(">i", data)[0] + assert value == 12345 + finally: + client.disconnect() + + def test_read_db2_raw(self, server: S7CommPlusServer) -> None: + client = S7CommPlusClient() + client.connect("127.0.0.1", port=TEST_PORT) + try: + # DB2 should be all zeros + data = client.db_read(2, 0, 10) + assert data == b"\x00" * 10 + finally: + client.disconnect() + + def test_multi_read(self, server: S7CommPlusServer) -> None: + client = S7CommPlusClient() + client.connect("127.0.0.1", port=TEST_PORT) + try: + results = client.db_read_multi( + [ + (1, 0, 4), # temperature from DB1 + (1, 4, 4), # pressure from DB1 + (2, 0, 4), # zeros from DB2 + ] + ) + assert len(results) == 3 + temp = struct.unpack(">f", results[0])[0] + assert abs(temp - 23.5) < 0.001 + assert results[2] == b"\x00\x00\x00\x00" + finally: + client.disconnect() + + def test_explore(self, server: S7CommPlusServer) -> None: + client = S7CommPlusClient() + client.connect("127.0.0.1", port=TEST_PORT) + try: + response = client.explore() + # Response should contain data about registered DBs + assert len(response) > 0 + finally: + client.disconnect() + + def test_server_data_persists_across_clients(self, server: S7CommPlusServer) -> None: + # Client 1 writes + c1 = S7CommPlusClient() + c1.connect("127.0.0.1", port=TEST_PORT) + c1.db_write(2, 0, b"\xde\xad\xbe\xef") + c1.disconnect() + + # Client 2 reads + c2 = S7CommPlusClient() + c2.connect("127.0.0.1", port=TEST_PORT) + data = c2.db_read(2, 0, 4) + c2.disconnect() + + assert data == b"\xde\xad\xbe\xef" + + def test_multiple_concurrent_clients(self, server: S7CommPlusServer) -> None: + clients = [] + for _ in range(3): + c = S7CommPlusClient() + c.connect("127.0.0.1", port=TEST_PORT) + clients.append(c) + + # All should have different session IDs + session_ids = {c.session_id for c in clients} + assert len(session_ids) == 3 + + for c in clients: + c.disconnect() + + +@pytest.mark.asyncio +class TestAsyncClientServerIntegration: + """Test async client against the server emulator.""" + + async def test_connect_disconnect(self, server: S7CommPlusServer) -> None: + client = S7CommPlusAsyncClient() + await client.connect("127.0.0.1", port=TEST_PORT) + assert client.connected + assert client.session_id != 0 + await client.disconnect() + assert not client.connected + + async def test_async_context_manager(self, server: S7CommPlusServer) -> None: + async with S7CommPlusAsyncClient() as client: + await client.connect("127.0.0.1", port=TEST_PORT) + assert client.connected + assert not client.connected + + async def test_read_real(self, server: S7CommPlusServer) -> None: + async with S7CommPlusAsyncClient() as client: + await client.connect("127.0.0.1", port=TEST_PORT) + data = await client.db_read(1, 0, 4) + value = struct.unpack(">f", data)[0] + assert abs(value - 23.5) < 0.001 + + async def test_write_and_read_back(self, server: S7CommPlusServer) -> None: + async with S7CommPlusAsyncClient() as client: + await client.connect("127.0.0.1", port=TEST_PORT) + await client.db_write(1, 0, struct.pack(">f", 77.7)) + data = await client.db_read(1, 0, 4) + value = struct.unpack(">f", data)[0] + assert abs(value - 77.7) < 0.1 + + async def test_multi_read(self, server: S7CommPlusServer) -> None: + async with S7CommPlusAsyncClient() as client: + await client.connect("127.0.0.1", port=TEST_PORT) + results = await client.db_read_multi( + [ + (1, 0, 4), + (1, 10, 4), + ] + ) + assert len(results) == 2 + temp = struct.unpack(">f", results[0])[0] + assert abs(temp - 23.5) < 0.1 # May be modified by earlier test + + async def test_explore(self, server: S7CommPlusServer) -> None: + async with S7CommPlusAsyncClient() as client: + await client.connect("127.0.0.1", port=TEST_PORT) + response = await client.explore() + assert len(response) > 0 + + async def test_concurrent_reads(self, server: S7CommPlusServer) -> None: + """Test that asyncio.Lock prevents interleaved requests.""" + async with S7CommPlusAsyncClient() as client: + await client.connect("127.0.0.1", port=TEST_PORT) + + async def read_temp() -> float: + data = await client.db_read(1, 0, 4) + return float(struct.unpack(">f", data)[0]) + + results = await asyncio.gather(read_temp(), read_temp(), read_temp()) + assert len(results) == 3 + for r in results: + assert isinstance(r, float) diff --git a/tests/test_s7commplus_vlq.py b/tests/test_s7commplus_vlq.py new file mode 100644 index 00000000..d7dbb596 --- /dev/null +++ b/tests/test_s7commplus_vlq.py @@ -0,0 +1,161 @@ +"""Tests for S7CommPlus VLQ (Variable-Length Quantity) encoding.""" + +import pytest + +from snap7.s7commplus.vlq import ( + encode_uint32_vlq, + decode_uint32_vlq, + encode_int32_vlq, + decode_int32_vlq, + encode_uint64_vlq, + decode_uint64_vlq, + encode_int64_vlq, + decode_int64_vlq, +) + + +class TestUInt32Vlq: + """Test unsigned 32-bit VLQ encoding/decoding.""" + + @pytest.mark.parametrize( + "value, expected_bytes", + [ + (0, bytes([0x00])), + (1, bytes([0x01])), + (0x7F, bytes([0x7F])), + (0x80, bytes([0x81, 0x00])), + (0xFF, bytes([0x81, 0x7F])), + (0x100, bytes([0x82, 0x00])), + (0x3FFF, bytes([0xFF, 0x7F])), + (0x4000, bytes([0x81, 0x80, 0x00])), + ], + ) + def test_encode_known_values(self, value: int, expected_bytes: bytes) -> None: + assert encode_uint32_vlq(value) == expected_bytes + + @pytest.mark.parametrize( + "value", + [0, 1, 127, 128, 255, 256, 16383, 16384, 0xFFFF, 0xFFFFFF, 0xFFFFFFFF], + ) + def test_roundtrip(self, value: int) -> None: + encoded = encode_uint32_vlq(value) + decoded, consumed = decode_uint32_vlq(encoded) + assert decoded == value + assert consumed == len(encoded) + + def test_decode_with_offset(self) -> None: + prefix = bytes([0xAA, 0xBB]) + encoded = encode_uint32_vlq(12345) + data = prefix + encoded + decoded, consumed = decode_uint32_vlq(data, offset=2) + assert decoded == 12345 + + def test_encode_out_of_range(self) -> None: + with pytest.raises(ValueError): + encode_uint32_vlq(-1) + with pytest.raises(ValueError): + encode_uint32_vlq(0x100000000) + + def test_decode_truncated(self) -> None: + # Continuation bit set but no more data + with pytest.raises(ValueError): + decode_uint32_vlq(bytes([0x80])) + + +class TestInt32Vlq: + """Test signed 32-bit VLQ encoding/decoding.""" + + @pytest.mark.parametrize( + "value", + [0, 1, -1, 63, -64, 64, -65, 127, -128, 0x7FFFFFFF, -0x80000000, 1234567, -1234567], + ) + def test_roundtrip(self, value: int) -> None: + encoded = encode_int32_vlq(value) + decoded, consumed = decode_int32_vlq(encoded) + assert decoded == value + assert consumed == len(encoded) + + def test_negative_one(self) -> None: + """Test that -1 encodes compactly.""" + encoded = encode_int32_vlq(-1) + decoded, _ = decode_int32_vlq(encoded) + assert decoded == -1 + + def test_min_value(self) -> None: + """Test INT32_MIN boundary.""" + encoded = encode_int32_vlq(-0x80000000) + decoded, _ = decode_int32_vlq(encoded) + assert decoded == -0x80000000 + + def test_encode_out_of_range(self) -> None: + with pytest.raises(ValueError): + encode_int32_vlq(-0x80000001) + with pytest.raises(ValueError): + encode_int32_vlq(0x80000000) + + +class TestUInt64Vlq: + """Test unsigned 64-bit VLQ encoding/decoding.""" + + @pytest.mark.parametrize( + "value", + [ + 0, + 1, + 127, + 128, + 0xFFFF, + 0xFFFFFFFF, + 0xFFFFFFFFFF, + 0x00FFFFFFFFFFFFFF, # Just below the special threshold + 0x00FFFFFFFFFFFFFF + 1, # At the special threshold + 0xFFFFFFFFFFFFFFFF, # Max uint64 + ], + ) + def test_roundtrip(self, value: int) -> None: + encoded = encode_uint64_vlq(value) + decoded, consumed = decode_uint64_vlq(encoded) + assert decoded == value + assert consumed == len(encoded) + + def test_max_encoding_length(self) -> None: + """Max uint64 should encode in at most 9 bytes.""" + encoded = encode_uint64_vlq(0xFFFFFFFFFFFFFFFF) + assert len(encoded) <= 9 + + def test_encode_out_of_range(self) -> None: + with pytest.raises(ValueError): + encode_uint64_vlq(-1) + with pytest.raises(ValueError): + encode_uint64_vlq(0x10000000000000000) + + +class TestInt64Vlq: + """Test signed 64-bit VLQ encoding/decoding.""" + + @pytest.mark.parametrize( + "value", + [ + 0, + 1, + -1, + 63, + -64, + 127, + -128, + 0x7FFFFFFFFFFFFFFF, # Max int64 + -0x8000000000000000, # Min int64 + 123456789012345, + -123456789012345, + ], + ) + def test_roundtrip(self, value: int) -> None: + encoded = encode_int64_vlq(value) + decoded, consumed = decode_int64_vlq(encoded) + assert decoded == value + assert consumed == len(encoded) + + def 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"sha256:1bd755b504931164a5a496d217c014d098426cddc79363ad66ac78125f9d908f", size = 5825084, upload-time = "2026-03-09T17:24:35.378Z" }, + { url = "https://files.pythonhosted.org/packages/29/d1/3f62e4f9577b28c352c11623a03fb916096d5c131303d4861b4914481b6b/virtualenv-21.0.0-py3-none-any.whl", hash = "sha256:d44e70637402c7f4b10f48491c02a6397a3a187152a70cba0b6bc7642d69fb05", size = 5817167, upload-time = "2026-02-25T20:21:05.476Z" }, ] From a2561a28253773269fb5b4bd89c5654055a8915e Mon Sep 17 00:00:00 2001 From: Gijs Molenaar Date: Fri, 20 Mar 2026 12:39:17 +0200 Subject: [PATCH 13/19] Enhanced CLI tools for PLC interaction (#631) * Add CLI tools for direct PLC interaction (read, write, dump, info) Expand the snap7 CLI beyond snap7-server with subcommands for reading, writing, dumping, and inspecting PLCs directly from the terminal. Closes #621 Co-Authored-By: Claude Opus 4.6 * Fix CI: skip CLI tests when click is not installed Uses pytest.importorskip("click") so test collection doesn't fail in CI environments that only install the test dependencies. Co-Authored-By: Claude Opus 4.6 * Rename CLI entry point from snap7 to s7, add discover hook Renames the CLI command from `snap7` to `s7` for a cleaner interface. Adds a hook to auto-register `s7 discover` when the discovery module is available, so both PRs compose cleanly when merged. Co-Authored-By: Claude Opus 4.6 --------- Co-authored-by: Claude Opus 4.6 --- pyproject.toml | 1 + snap7/cli.py | 382 ++++++++++++++++++++++++++++++++++++++++++++++ tests/test_cli.py | 170 +++++++++++++++++++++ 3 files changed, 553 insertions(+) create mode 100644 snap7/cli.py create mode 100644 tests/test_cli.py diff --git a/pyproject.toml b/pyproject.toml index 2783274d..28b03bc2 100644 --- a/pyproject.toml +++ b/pyproject.toml @@ -44,6 +44,7 @@ include = ["snap7*"] [project.scripts] snap7-server = "snap7.server:mainloop" +s7 = "snap7.cli:main" [tool.pytest.ini_options] testpaths = ["tests"] diff --git a/snap7/cli.py b/snap7/cli.py new file mode 100644 index 00000000..b53624d2 --- /dev/null +++ b/snap7/cli.py @@ -0,0 +1,382 @@ +""" +Command-line interface for python-snap7. + +Provides subcommands for interacting with Siemens S7 PLCs: +- server: Start an emulated S7 PLC server +- read: Read data from a PLC +- write: Write data to a PLC +- dump: Dump DB contents +- info: Get PLC information +""" + +import logging +import sys +from typing import Optional + +try: + import click +except ImportError: + print("CLI dependencies not installed. Try: pip install python-snap7[cli]") + raise + +from snap7 import __version__ +from snap7.client import Client +from snap7.server import mainloop +from snap7.util import ( + get_bool, + get_byte, + get_dint, + get_dword, + get_int, + get_real, + get_string, + get_uint, + get_udint, + get_word, + get_lreal, + set_bool, + set_byte, + set_dint, + set_dword, + set_int, + set_real, + set_string, + set_uint, + set_udint, + set_word, + set_lreal, +) + +logger = logging.getLogger(__name__) + +# Map type names to (getter, size_in_bytes) for reads +TYPE_READ_MAP: dict[str, tuple[str, int]] = { + "bool": ("bool", 1), + "byte": ("byte", 1), + "int": ("int", 2), + "uint": ("uint", 2), + "word": ("word", 2), + "dint": ("dint", 4), + "udint": ("udint", 4), + "dword": ("dword", 4), + "real": ("real", 4), + "lreal": ("lreal", 8), + "string": ("string", 256), +} + + +def _connect(host: str, rack: int, slot: int, port: int) -> Client: + """Create and connect a client.""" + client = Client() + client.connect(host, rack, slot, port) + return client + + +def _read_typed(client: Client, db: int, offset: int, type_name: str, bit: int = 0) -> str: + """Read a typed value and return its string representation.""" + if type_name == "bool": + data = client.db_read(db, offset, 1) + return str(get_bool(data, 0, bit)) + elif type_name == "byte": + data = client.db_read(db, offset, 1) + return str(get_byte(data, 0)) + elif type_name == "int": + data = client.db_read(db, offset, 2) + return str(get_int(data, 0)) + elif type_name == "uint": + data = client.db_read(db, offset, 2) + return str(get_uint(data, 0)) + elif type_name == "word": + data = client.db_read(db, offset, 2) + return str(get_word(data, 0)) + elif type_name == "dint": + data = client.db_read(db, offset, 4) + return str(get_dint(data, 0)) + elif type_name == "udint": + data = client.db_read(db, offset, 4) + return str(get_udint(data, 0)) + elif type_name == "dword": + data = client.db_read(db, offset, 4) + return str(get_dword(data, 0)) + elif type_name == "real": + data = client.db_read(db, offset, 4) + return str(get_real(data, 0)) + elif type_name == "lreal": + data = client.db_read(db, offset, 8) + return str(get_lreal(data, 0)) + elif type_name == "string": + data = client.db_read(db, offset, 256) + return get_string(data, 0) + else: + raise click.BadParameter(f"Unknown type: {type_name}") + + +def _format_hex(data: bytearray) -> str: + """Format bytearray as hex dump with offsets.""" + lines = [] + for i in range(0, len(data), 16): + chunk = data[i : i + 16] + hex_part = " ".join(f"{b:02X}" for b in chunk) + ascii_part = "".join(chr(b) if 32 <= b < 127 else "." for b in chunk) + lines.append(f"{i:04X} {hex_part:<48s} {ascii_part}") + return "\n".join(lines) + + +@click.group() +@click.version_option(__version__) +@click.option("-v", "--verbose", is_flag=True, help="Enable debug output.") +def main(verbose: bool) -> None: + """s7: CLI tools for Siemens S7 PLC communication.""" + if verbose: + logging.basicConfig(format="[%(levelname)s]: %(message)s", level=logging.DEBUG) + else: + logging.basicConfig(format="[%(levelname)s]: %(message)s", level=logging.INFO) + + +@main.command() +@click.option("-p", "--port", default=1102, help="Port the server will listen on.") +def server(port: int) -> None: + """Start an emulated S7 PLC server with default values.""" + mainloop(port, init_standard_values=True) + + +@main.command() +@click.argument("host") +@click.option("--db", required=True, type=int, help="DB number to read from.") +@click.option("--offset", required=True, type=int, help="Byte offset to start reading.") +@click.option("--size", type=int, default=None, help="Number of bytes to read (for raw/bytes mode).") +@click.option( + "--type", + "data_type", + type=click.Choice(list(TYPE_READ_MAP.keys()) + ["bytes"], case_sensitive=False), + default="bytes", + help="Data type to read.", +) +@click.option("--bit", type=int, default=0, help="Bit offset (only for bool type).") +@click.option("--rack", type=int, default=0, help="PLC rack number.") +@click.option("--slot", type=int, default=1, help="PLC slot number.") +@click.option("--port", type=int, default=102, help="PLC TCP port.") +def read(host: str, db: int, offset: int, size: Optional[int], data_type: str, bit: int, rack: int, slot: int, port: int) -> None: + """Read data from a PLC.""" + try: + client = _connect(host, rack, slot, port) + except Exception as e: + click.echo(f"Connection failed: {e}", err=True) + sys.exit(1) + + try: + if data_type == "bytes": + if size is None: + click.echo("--size is required when reading raw bytes.", err=True) + sys.exit(1) + data = client.db_read(db, offset, size) + click.echo(_format_hex(data)) + else: + result = _read_typed(client, db, offset, data_type, bit) + click.echo(result) + except Exception as e: + click.echo(f"Read failed: {e}", err=True) + sys.exit(1) + finally: + client.disconnect() + + +@main.command() +@click.argument("host") +@click.option("--db", required=True, type=int, help="DB number to write to.") +@click.option("--offset", required=True, type=int, help="Byte offset to start writing.") +@click.option( + "--type", + "data_type", + required=True, + type=click.Choice(list(TYPE_READ_MAP.keys()) + ["bytes"], case_sensitive=False), + help="Data type to write.", +) +@click.option("--value", required=True, type=str, help="Value to write.") +@click.option("--bit", type=int, default=0, help="Bit offset (only for bool type).") +@click.option("--rack", type=int, default=0, help="PLC rack number.") +@click.option("--slot", type=int, default=1, help="PLC slot number.") +@click.option("--port", type=int, default=102, help="PLC TCP port.") +def write(host: str, db: int, offset: int, data_type: str, value: str, bit: int, rack: int, slot: int, port: int) -> None: + """Write data to a PLC.""" + try: + client = _connect(host, rack, slot, port) + except Exception as e: + click.echo(f"Connection failed: {e}", err=True) + sys.exit(1) + + try: + if data_type == "bytes": + raw = bytes.fromhex(value.replace(" ", "")) + client.db_write(db, offset, bytearray(raw)) + elif data_type == "bool": + data = client.db_read(db, offset, 1) + set_bool(data, 0, bit, value.lower() in ("true", "1", "yes")) + client.db_write(db, offset, data) + elif data_type == "byte": + data = bytearray(1) + set_byte(data, 0, int(value)) + client.db_write(db, offset, data) + elif data_type == "int": + data = bytearray(2) + set_int(data, 0, int(value)) + client.db_write(db, offset, data) + elif data_type == "uint": + data = bytearray(2) + set_uint(data, 0, int(value)) + client.db_write(db, offset, data) + elif data_type == "word": + data = bytearray(2) + set_word(data, 0, int(value)) + client.db_write(db, offset, data) + elif data_type == "dint": + data = bytearray(4) + set_dint(data, 0, int(value)) + client.db_write(db, offset, data) + elif data_type == "udint": + data = bytearray(4) + set_udint(data, 0, int(value)) + client.db_write(db, offset, data) + elif data_type == "dword": + data = bytearray(4) + set_dword(data, 0, int(value)) + client.db_write(db, offset, data) + elif data_type == "real": + data = bytearray(4) + set_real(data, 0, float(value)) + client.db_write(db, offset, data) + elif data_type == "lreal": + data = bytearray(8) + set_lreal(data, 0, float(value)) + client.db_write(db, offset, data) + elif data_type == "string": + data = bytearray(256) + set_string(data, 0, value, 254) + actual_size = 2 + len(value) + client.db_write(db, offset, data[:actual_size]) + else: + click.echo(f"Unknown type: {data_type}", err=True) + sys.exit(1) + click.echo("OK") + except Exception as e: + click.echo(f"Write failed: {e}", err=True) + sys.exit(1) + finally: + client.disconnect() + + +@main.command() +@click.argument("host") +@click.option("--db", required=True, type=int, help="DB number to dump.") +@click.option("--size", type=int, default=256, help="Number of bytes to dump.") +@click.option( + "--format", + "fmt", + type=click.Choice(["hex", "bytes"], case_sensitive=False), + default="hex", + help="Output format.", +) +@click.option("--rack", type=int, default=0, help="PLC rack number.") +@click.option("--slot", type=int, default=1, help="PLC slot number.") +@click.option("--port", type=int, default=102, help="PLC TCP port.") +def dump(host: str, db: int, size: int, fmt: str, rack: int, slot: int, port: int) -> None: + """Dump DB contents from a PLC.""" + try: + client = _connect(host, rack, slot, port) + except Exception as e: + click.echo(f"Connection failed: {e}", err=True) + sys.exit(1) + + try: + data = client.db_read(db, 0, size) + if fmt == "hex": + click.echo(f"DB{db} ({len(data)} bytes):") + click.echo(_format_hex(data)) + else: + click.echo(data.hex()) + except Exception as e: + click.echo(f"Dump failed: {e}", err=True) + sys.exit(1) + finally: + client.disconnect() + + +@main.command() +@click.argument("host") +@click.option("--rack", type=int, default=0, help="PLC rack number.") +@click.option("--slot", type=int, default=1, help="PLC slot number.") +@click.option("--port", type=int, default=102, help="PLC TCP port.") +def info(host: str, rack: int, slot: int, port: int) -> None: + """Get PLC information.""" + try: + client = _connect(host, rack, slot, port) + except Exception as e: + click.echo(f"Connection failed: {e}", err=True) + sys.exit(1) + + try: + # CPU Info + try: + cpu_info = client.get_cpu_info() + click.echo("CPU Info:") + click.echo(f" Module Type: {cpu_info.ModuleTypeName}") + click.echo(f" Serial Number: {cpu_info.SerialNumber}") + click.echo(f" AS Name: {cpu_info.ASName}") + click.echo(f" Copyright: {cpu_info.Copyright}") + click.echo(f" Module Name: {cpu_info.ModuleName}") + except Exception as e: + click.echo(f" CPU Info: unavailable ({e})") + + # CPU State + try: + state = client.get_cpu_state() + click.echo(f"\nCPU State: {state}") + except Exception as e: + click.echo(f"\nCPU State: unavailable ({e})") + + # Order Code + try: + order_code = client.get_order_code() + click.echo(f"\nOrder Code: {order_code.OrderCode}") + except Exception as e: + click.echo(f"\nOrder Code: unavailable ({e})") + + # Protection + try: + protection = client.get_protection() + click.echo(f"\nProtection Level: {protection.sch_schal}") + except Exception as e: + click.echo(f"\nProtection: unavailable ({e})") + + # Block list + try: + blocks = client.list_blocks() + click.echo("\nBlocks:") + click.echo(f" OB: {blocks.OBCount}") + click.echo(f" FB: {blocks.FBCount}") + click.echo(f" FC: {blocks.FCCount}") + click.echo(f" SFB: {blocks.SFBCount}") + click.echo(f" SFC: {blocks.SFCCount}") + click.echo(f" DB: {blocks.DBCount}") + click.echo(f" SDB: {blocks.SDBCount}") + except Exception as e: + click.echo(f"\nBlocks: unavailable ({e})") + + except Exception as e: + click.echo(f"Info failed: {e}", err=True) + sys.exit(1) + finally: + client.disconnect() + + +# Register optional subcommands from other modules +try: + from snap7.discovery import discover_command + + main.add_command(discover_command, "discover") +except ImportError: + pass + + +if __name__ == "__main__": + main() diff --git a/tests/test_cli.py b/tests/test_cli.py new file mode 100644 index 00000000..dababa78 --- /dev/null +++ b/tests/test_cli.py @@ -0,0 +1,170 @@ +"""Tests for the CLI tools.""" + +import unittest + +import pytest + +click = pytest.importorskip("click") +from click.testing import CliRunner # noqa: E402 + +from snap7.cli import main # noqa: E402 +from snap7.server import Server # noqa: E402 +from snap7.type import SrvArea # noqa: E402 + +ip = "127.0.0.1" +tcpport = 1102 +rack = 1 +slot = 1 + + +@pytest.mark.client +class TestCLI(unittest.TestCase): + server: Server = None # type: ignore + + @classmethod + def setUpClass(cls) -> None: + cls.server = Server() + cls.server.register_area(SrvArea.DB, 0, bytearray(600)) + cls.server.register_area(SrvArea.DB, 1, bytearray(600)) + cls.server.register_area(SrvArea.PA, 0, bytearray(100)) + cls.server.register_area(SrvArea.PE, 0, bytearray(100)) + cls.server.register_area(SrvArea.MK, 0, bytearray(100)) + cls.server.register_area(SrvArea.TM, 0, bytearray(100)) + cls.server.register_area(SrvArea.CT, 0, bytearray(100)) + cls.server.start(tcp_port=tcpport) + + @classmethod + def tearDownClass(cls) -> None: + if cls.server: + cls.server.stop() + cls.server.destroy() + + def setUp(self) -> None: + self.runner = CliRunner() + + def test_help(self) -> None: + result = self.runner.invoke(main, ["--help"]) + assert result.exit_code == 0 + assert "s7" in result.output + + def test_version(self) -> None: + result = self.runner.invoke(main, ["--version"]) + assert result.exit_code == 0 + + def test_read_bytes(self) -> None: + result = self.runner.invoke(main, ["read", ip, "--db", "1", "--offset", "0", "--size", "4", "--port", str(tcpport)]) + assert result.exit_code == 0 + assert "0000" in result.output + + def test_read_bytes_missing_size(self) -> None: + result = self.runner.invoke(main, ["read", ip, "--db", "1", "--offset", "0", "--port", str(tcpport)]) + assert result.exit_code != 0 + + def test_read_int(self) -> None: + result = self.runner.invoke(main, ["read", ip, "--db", "1", "--offset", "0", "--type", "int", "--port", str(tcpport)]) + assert result.exit_code == 0 + + def test_read_real(self) -> None: + result = self.runner.invoke(main, ["read", ip, "--db", "1", "--offset", "0", "--type", "real", "--port", str(tcpport)]) + assert result.exit_code == 0 + + def test_read_bool(self) -> None: + result = self.runner.invoke( + main, ["read", ip, "--db", "1", "--offset", "0", "--type", "bool", "--bit", "0", "--port", str(tcpport)] + ) + assert result.exit_code == 0 + assert result.output.strip() in ("True", "False") + + def test_write_int(self) -> None: + result = self.runner.invoke( + main, ["write", ip, "--db", "1", "--offset", "0", "--type", "int", "--value", "42", "--port", str(tcpport)] + ) + assert result.exit_code == 0 + assert "OK" in result.output + + # Verify + result = self.runner.invoke(main, ["read", ip, "--db", "1", "--offset", "0", "--type", "int", "--port", str(tcpport)]) + assert result.exit_code == 0 + assert "42" in result.output + + def test_write_real(self) -> None: + result = self.runner.invoke( + main, ["write", ip, "--db", "1", "--offset", "4", "--type", "real", "--value", "3.14", "--port", str(tcpport)] + ) + assert result.exit_code == 0 + assert "OK" in result.output + + def test_write_bool(self) -> None: + result = self.runner.invoke( + main, + [ + "write", + ip, + "--db", + "1", + "--offset", + "10", + "--type", + "bool", + "--value", + "true", + "--bit", + "3", + "--port", + str(tcpport), + ], + ) + assert result.exit_code == 0 + assert "OK" in result.output + + def test_write_bytes_hex(self) -> None: + result = self.runner.invoke( + main, ["write", ip, "--db", "1", "--offset", "20", "--type", "bytes", "--value", "DEADBEEF", "--port", str(tcpport)] + ) + assert result.exit_code == 0 + assert "OK" in result.output + + def test_dump(self) -> None: + result = self.runner.invoke(main, ["dump", ip, "--db", "1", "--size", "32", "--port", str(tcpport)]) + assert result.exit_code == 0 + assert "DB1" in result.output + assert "0000" in result.output + + def test_dump_bytes_format(self) -> None: + result = self.runner.invoke(main, ["dump", ip, "--db", "1", "--size", "16", "--format", "bytes", "--port", str(tcpport)]) + assert result.exit_code == 0 + + def test_info(self) -> None: + result = self.runner.invoke(main, ["info", ip, "--port", str(tcpport)]) + assert result.exit_code == 0 + + def test_read_connection_failure(self) -> None: + result = self.runner.invoke(main, ["read", "192.0.2.1", "--db", "1", "--offset", "0", "--size", "4", "--port", "9999"]) + assert result.exit_code != 0 + assert "Connection failed" in result.output + + def test_server_help(self) -> None: + result = self.runner.invoke(main, ["server", "--help"]) + assert result.exit_code == 0 + + def test_write_dint(self) -> None: + result = self.runner.invoke( + main, ["write", ip, "--db", "1", "--offset", "30", "--type", "dint", "--value", "-100000", "--port", str(tcpport)] + ) + assert result.exit_code == 0 + assert "OK" in result.output + + def test_write_word(self) -> None: + result = self.runner.invoke( + main, ["write", ip, "--db", "1", "--offset", "34", "--type", "word", "--value", "1234", "--port", str(tcpport)] + ) + assert result.exit_code == 0 + assert "OK" in result.output + + def test_read_all_types(self) -> None: + """Test that all type names are accepted without error.""" + for type_name in ["byte", "uint", "word", "dword", "udint", "lreal"]: + result = self.runner.invoke( + main, ["read", ip, "--db", "1", "--offset", "0", "--type", type_name, "--port", str(tcpport)] + ) + assert result.exit_code == 0, f"Failed for type {type_name}: {result.output}" From ab099647b91a1a3f1da6689404f2c2b6511de10d Mon Sep 17 00:00:00 2001 From: Gijs Molenaar Date: Fri, 20 Mar 2026 12:39:35 +0200 Subject: [PATCH 14/19] Add typed DB access methods for common S7 data types (#632) Adds db_read_*/db_write_* convenience methods for bool, byte, int, uint, word, dint, udint, dword, real, lreal, string, and wstring types. Closes #617 Co-authored-by: Claude Opus 4.6 --- snap7/client.py | 219 +++++++++++++++++++++++++++++++++++++ tests/test_typed_access.py | 202 ++++++++++++++++++++++++++++++++++ 2 files changed, 421 insertions(+) create mode 100644 tests/test_typed_access.py diff --git a/snap7/client.py b/snap7/client.py index 69cf8e07..40bdb707 100644 --- a/snap7/client.py +++ b/snap7/client.py @@ -1486,6 +1486,225 @@ def ct_write(self, start: int, size: int, data: bytearray) -> int: raise ValueError(f"Data length {len(data)} doesn't match size {size * 2}") return self.write_area(Area.CT, 0, start, data) + # Typed DB access methods + + def db_read_bool(self, db_number: int, byte_offset: int, bit_offset: int) -> bool: + """Read a single bit from a DB. + + Args: + db_number: DB number + byte_offset: Byte offset within the DB + bit_offset: Bit offset within the byte (0-7) + + Returns: + Boolean value + """ + from .util import get_bool + + data = self.db_read(db_number, byte_offset, 1) + return get_bool(data, 0, bit_offset) + + def db_write_bool(self, db_number: int, byte_offset: int, bit_offset: int, value: bool) -> None: + """Write a single bit to a DB (preserving other bits in the byte). + + Args: + db_number: DB number + byte_offset: Byte offset within the DB + bit_offset: Bit offset within the byte (0-7) + value: Boolean value to write + """ + from .util import set_bool + + data = self.db_read(db_number, byte_offset, 1) + set_bool(data, 0, bit_offset, value) + self.db_write(db_number, byte_offset, data) + + def db_read_byte(self, db_number: int, offset: int) -> int: + """Read a BYTE (8-bit unsigned) from a DB.""" + data = self.db_read(db_number, offset, 1) + return data[0] + + def db_write_byte(self, db_number: int, offset: int, value: int) -> None: + """Write a BYTE (8-bit unsigned) to a DB.""" + from .util import set_byte + + data = bytearray(1) + set_byte(data, 0, value) + self.db_write(db_number, offset, data) + + def db_read_int(self, db_number: int, offset: int) -> int: + """Read an INT (16-bit signed) from a DB.""" + from .util import get_int + + data = self.db_read(db_number, offset, 2) + return get_int(data, 0) + + def db_write_int(self, db_number: int, offset: int, value: int) -> None: + """Write an INT (16-bit signed) to a DB.""" + from .util import set_int + + data = bytearray(2) + set_int(data, 0, value) + self.db_write(db_number, offset, data) + + def db_read_uint(self, db_number: int, offset: int) -> int: + """Read a UINT (16-bit unsigned) from a DB.""" + from .util import get_uint + + data = self.db_read(db_number, offset, 2) + return get_uint(data, 0) + + def db_write_uint(self, db_number: int, offset: int, value: int) -> None: + """Write a UINT (16-bit unsigned) to a DB.""" + from .util import set_uint + + data = bytearray(2) + set_uint(data, 0, value) + self.db_write(db_number, offset, data) + + def db_read_word(self, db_number: int, offset: int) -> int: + """Read a WORD (16-bit unsigned) from a DB.""" + data = self.db_read(db_number, offset, 2) + return (data[0] << 8) | data[1] + + def db_write_word(self, db_number: int, offset: int, value: int) -> None: + """Write a WORD (16-bit unsigned) to a DB.""" + from .util import set_word + + data = bytearray(2) + set_word(data, 0, value) + self.db_write(db_number, offset, data) + + def db_read_dint(self, db_number: int, offset: int) -> int: + """Read a DINT (32-bit signed) from a DB.""" + from .util import get_dint + + data = self.db_read(db_number, offset, 4) + return get_dint(data, 0) + + def db_write_dint(self, db_number: int, offset: int, value: int) -> None: + """Write a DINT (32-bit signed) to a DB.""" + from .util import set_dint + + data = bytearray(4) + set_dint(data, 0, value) + self.db_write(db_number, offset, data) + + def db_read_udint(self, db_number: int, offset: int) -> int: + """Read a UDINT (32-bit unsigned) from a DB.""" + from .util import get_udint + + data = self.db_read(db_number, offset, 4) + return get_udint(data, 0) + + def db_write_udint(self, db_number: int, offset: int, value: int) -> None: + """Write a UDINT (32-bit unsigned) to a DB.""" + from .util import set_udint + + data = bytearray(4) + set_udint(data, 0, value) + self.db_write(db_number, offset, data) + + def db_read_dword(self, db_number: int, offset: int) -> int: + """Read a DWORD (32-bit unsigned) from a DB.""" + from .util import get_dword + + data = self.db_read(db_number, offset, 4) + return get_dword(data, 0) + + def db_write_dword(self, db_number: int, offset: int, value: int) -> None: + """Write a DWORD (32-bit unsigned) to a DB.""" + from .util import set_dword + + data = bytearray(4) + set_dword(data, 0, value) + self.db_write(db_number, offset, data) + + def db_read_real(self, db_number: int, offset: int) -> float: + """Read a REAL (32-bit float) from a DB.""" + from .util import get_real + + data = self.db_read(db_number, offset, 4) + return get_real(data, 0) + + def db_write_real(self, db_number: int, offset: int, value: float) -> None: + """Write a REAL (32-bit float) to a DB.""" + from .util import set_real + + data = bytearray(4) + set_real(data, 0, value) + self.db_write(db_number, offset, data) + + def db_read_lreal(self, db_number: int, offset: int) -> float: + """Read a LREAL (64-bit float) from a DB.""" + from .util import get_lreal + + data = self.db_read(db_number, offset, 8) + return get_lreal(data, 0) + + def db_write_lreal(self, db_number: int, offset: int, value: float) -> None: + """Write a LREAL (64-bit float) to a DB.""" + from .util import set_lreal + + data = bytearray(8) + set_lreal(data, 0, value) + self.db_write(db_number, offset, data) + + def db_read_string(self, db_number: int, offset: int) -> str: + """Read an S7 STRING from a DB. + + Reads the 2-byte header to determine max length, then reads the full string. + """ + from .util import get_string + + header = self.db_read(db_number, offset, 2) + max_len = header[0] + data = self.db_read(db_number, offset, 2 + max_len) + return get_string(data, 0) + + def db_write_string(self, db_number: int, offset: int, value: str, max_length: int = 254) -> None: + """Write an S7 STRING to a DB. + + Args: + db_number: DB number + offset: Byte offset + value: String to write + max_length: Maximum string length (default 254) + """ + from .util import set_string + + data = bytearray(2 + max_length) + set_string(data, 0, value, max_length) + actual_size = 2 + max_length + self.db_write(db_number, offset, data[:actual_size]) + + def db_read_wstring(self, db_number: int, offset: int) -> str: + """Read an S7 WSTRING from a DB. + + Reads the 4-byte header to determine max length, then reads the full string. + """ + from .util import get_wstring + + header = self.db_read(db_number, offset, 4) + max_len = (header[0] << 8) | header[1] + data = self.db_read(db_number, offset, 4 + max_len * 2) + return get_wstring(data, 0) + + def db_write_wstring(self, db_number: int, offset: int, value: str, max_length: int = 254) -> None: + """Write an S7 WSTRING to a DB. + + Args: + db_number: DB number + offset: Byte offset + value: String to write + max_length: Maximum string length in characters (default 254) + """ + from .util import set_wstring + + data = bytearray(4 + max_length * 2) + set_wstring(data, 0, value, max_length) + self.db_write(db_number, offset, data) + # Async methods def as_ab_read(self, start: int, size: int, data: CDataArrayType) -> int: diff --git a/tests/test_typed_access.py b/tests/test_typed_access.py new file mode 100644 index 00000000..c961cef6 --- /dev/null +++ b/tests/test_typed_access.py @@ -0,0 +1,202 @@ +"""Tests for typed data access methods on Client.""" + +import unittest + +import pytest + +from snap7.client import Client +from snap7.server import Server +from snap7.type import SrvArea + +ip = "127.0.0.1" +tcpport = 1102 +rack = 1 +slot = 1 + + +@pytest.mark.client +class TestTypedAccess(unittest.TestCase): + server: Server = None # type: ignore + + @classmethod + def setUpClass(cls) -> None: + cls.server = Server() + cls.server.register_area(SrvArea.DB, 0, bytearray(600)) + cls.server.register_area(SrvArea.DB, 1, bytearray(600)) + cls.server.register_area(SrvArea.PA, 0, bytearray(100)) + cls.server.register_area(SrvArea.PE, 0, bytearray(100)) + cls.server.register_area(SrvArea.MK, 0, bytearray(100)) + cls.server.register_area(SrvArea.TM, 0, bytearray(100)) + cls.server.register_area(SrvArea.CT, 0, bytearray(100)) + cls.server.start(tcp_port=tcpport) + + @classmethod + def tearDownClass(cls) -> None: + if cls.server: + cls.server.stop() + cls.server.destroy() + + def setUp(self) -> None: + self.client = Client() + self.client.connect(ip, rack, slot, tcpport) + + def tearDown(self) -> None: + self.client.disconnect() + self.client.destroy() + + # Bool tests + + def test_bool_roundtrip(self) -> None: + self.client.db_write_bool(1, 0, 0, True) + self.assertTrue(self.client.db_read_bool(1, 0, 0)) + + self.client.db_write_bool(1, 0, 0, False) + self.assertFalse(self.client.db_read_bool(1, 0, 0)) + + def test_bool_preserves_other_bits(self) -> None: + # Write byte 0xFF first + self.client.db_write_byte(1, 0, 0xFF) + + # Clear bit 3 + self.client.db_write_bool(1, 0, 3, False) + self.assertFalse(self.client.db_read_bool(1, 0, 3)) + + # Other bits should still be set + self.assertTrue(self.client.db_read_bool(1, 0, 0)) + self.assertTrue(self.client.db_read_bool(1, 0, 1)) + self.assertTrue(self.client.db_read_bool(1, 0, 7)) + + def test_bool_all_bits(self) -> None: + self.client.db_write_byte(1, 0, 0) + for bit in range(8): + self.client.db_write_bool(1, 0, bit, True) + self.assertTrue(self.client.db_read_bool(1, 0, bit)) + + # Byte tests + + def test_byte_roundtrip(self) -> None: + self.client.db_write_byte(1, 10, 42) + self.assertEqual(42, self.client.db_read_byte(1, 10)) + + def test_byte_min_max(self) -> None: + self.client.db_write_byte(1, 10, 0) + self.assertEqual(0, self.client.db_read_byte(1, 10)) + + self.client.db_write_byte(1, 10, 255) + self.assertEqual(255, self.client.db_read_byte(1, 10)) + + # INT tests + + def test_int_roundtrip(self) -> None: + self.client.db_write_int(1, 20, 12345) + self.assertEqual(12345, self.client.db_read_int(1, 20)) + + def test_int_negative(self) -> None: + self.client.db_write_int(1, 20, -12345) + self.assertEqual(-12345, self.client.db_read_int(1, 20)) + + def test_int_min_max(self) -> None: + self.client.db_write_int(1, 20, -32768) + self.assertEqual(-32768, self.client.db_read_int(1, 20)) + + self.client.db_write_int(1, 20, 32767) + self.assertEqual(32767, self.client.db_read_int(1, 20)) + + # UINT tests + + def test_uint_roundtrip(self) -> None: + self.client.db_write_uint(1, 30, 50000) + self.assertEqual(50000, self.client.db_read_uint(1, 30)) + + def test_uint_min_max(self) -> None: + self.client.db_write_uint(1, 30, 0) + self.assertEqual(0, self.client.db_read_uint(1, 30)) + + self.client.db_write_uint(1, 30, 65535) + self.assertEqual(65535, self.client.db_read_uint(1, 30)) + + # WORD tests + + def test_word_roundtrip(self) -> None: + self.client.db_write_word(1, 40, 0xABCD) + self.assertEqual(0xABCD, self.client.db_read_word(1, 40)) + + # DINT tests + + def test_dint_roundtrip(self) -> None: + self.client.db_write_dint(1, 50, 100000) + self.assertEqual(100000, self.client.db_read_dint(1, 50)) + + def test_dint_negative(self) -> None: + self.client.db_write_dint(1, 50, -100000) + self.assertEqual(-100000, self.client.db_read_dint(1, 50)) + + def test_dint_min_max(self) -> None: + self.client.db_write_dint(1, 50, -2147483648) + self.assertEqual(-2147483648, self.client.db_read_dint(1, 50)) + + self.client.db_write_dint(1, 50, 2147483647) + self.assertEqual(2147483647, self.client.db_read_dint(1, 50)) + + # UDINT tests + + def test_udint_roundtrip(self) -> None: + self.client.db_write_udint(1, 60, 3000000000) + self.assertEqual(3000000000, self.client.db_read_udint(1, 60)) + + # DWORD tests + + def test_dword_roundtrip(self) -> None: + self.client.db_write_dword(1, 70, 0xDEADBEEF) + self.assertEqual(0xDEADBEEF, self.client.db_read_dword(1, 70)) + + # REAL tests + + def test_real_roundtrip(self) -> None: + self.client.db_write_real(1, 80, 3.14) + self.assertAlmostEqual(3.14, self.client.db_read_real(1, 80), places=2) + + def test_real_zero(self) -> None: + self.client.db_write_real(1, 80, 0.0) + self.assertEqual(0.0, self.client.db_read_real(1, 80)) + + def test_real_negative(self) -> None: + self.client.db_write_real(1, 80, -273.15) + self.assertAlmostEqual(-273.15, self.client.db_read_real(1, 80), places=2) + + # LREAL tests + + def test_lreal_roundtrip(self) -> None: + self.client.db_write_lreal(1, 90, 3.141592653589793) + self.assertAlmostEqual(3.141592653589793, self.client.db_read_lreal(1, 90), places=10) + + def test_lreal_zero(self) -> None: + self.client.db_write_lreal(1, 90, 0.0) + self.assertEqual(0.0, self.client.db_read_lreal(1, 90)) + + # STRING tests + + def test_string_roundtrip(self) -> None: + # First write a proper S7 string header + self.client.db_write_string(1, 100, "Hello") + result = self.client.db_read_string(1, 100) + self.assertEqual("Hello", result) + + def test_string_empty(self) -> None: + self.client.db_write_string(1, 100, "") + result = self.client.db_read_string(1, 100) + self.assertEqual("", result) + + # Combined test + + def test_multiple_types_coexist(self) -> None: + """Write different types at different offsets and verify they don't interfere.""" + self.client.db_write_int(1, 400, 1234) + self.client.db_write_real(1, 404, 5.678) + self.client.db_write_bool(1, 408, 0, True) + self.client.db_write_dint(1, 410, -99999) + + self.assertEqual(1234, self.client.db_read_int(1, 400)) + self.assertAlmostEqual(5.678, self.client.db_read_real(1, 404), places=2) + self.assertTrue(self.client.db_read_bool(1, 408, 0)) + self.assertEqual(-99999, self.client.db_read_dint(1, 410)) From 108a10705f00c61b31a0d53d7f9539f6607ebff8 Mon Sep 17 00:00:00 2001 From: Gijs Molenaar Date: Fri, 20 Mar 2026 12:41:45 +0200 Subject: [PATCH 15/19] Add protocol conformance test suite (#633) Adds 70 tests validating TPKT, COTP, and S7 protocol encoding against the specification at byte level. Closes #620 Co-authored-by: Claude Opus 4.6 --- pyproject.toml | 3 +- tests/test_conformance.py | 529 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 531 insertions(+), 1 deletion(-) create mode 100644 tests/test_conformance.py diff --git a/pyproject.toml b/pyproject.toml index 28b03bc2..3e28ea7b 100644 --- a/pyproject.toml +++ b/pyproject.toml @@ -56,7 +56,8 @@ markers =[ "mainloop", "partner", "server", - "util" + "util", + "conformance: protocol conformance tests" ] asyncio_mode = "auto" diff --git a/tests/test_conformance.py b/tests/test_conformance.py new file mode 100644 index 00000000..4c4a3557 --- /dev/null +++ b/tests/test_conformance.py @@ -0,0 +1,529 @@ +"""Protocol conformance test suite. + +Validates that the S7 protocol implementation correctly encodes/decodes +packets according to the TPKT, COTP, and S7 protocol specifications. +""" + +import struct + +import pytest + +from snap7.connection import ISOTCPConnection, TPDUSize +from snap7.datatypes import S7Area, S7WordLen +from snap7.error import S7ConnectionError, S7ProtocolError +from snap7.s7protocol import S7Function, S7PDUType, S7Protocol, S7_RETURN_CODES + + +@pytest.mark.conformance +class TestTPKTConformance: + """Verify TPKT frame encoding per RFC 1006.""" + + def test_tpkt_header_format(self) -> None: + """TPKT header: version=3, reserved=0, 2-byte big-endian length.""" + conn = ISOTCPConnection("127.0.0.1") + payload = b"\x01\x02\x03" + frame = conn._build_tpkt(payload) + + assert frame[0] == 3, "TPKT version must be 3" + assert frame[1] == 0, "TPKT reserved must be 0" + + def test_tpkt_length_includes_header(self) -> None: + """Length field includes the 4-byte TPKT header.""" + conn = ISOTCPConnection("127.0.0.1") + payload = b"\x01\x02\x03" + frame = conn._build_tpkt(payload) + + length = struct.unpack(">H", frame[2:4])[0] + assert length == len(payload) + 4 + + def test_tpkt_payload_preserved(self) -> None: + """Payload appears intact after the 4-byte header.""" + conn = ISOTCPConnection("127.0.0.1") + payload = b"\xde\xad\xbe\xef" + frame = conn._build_tpkt(payload) + + assert frame[4:] == payload + + def test_tpkt_empty_payload(self) -> None: + """Empty payload produces a 4-byte frame.""" + conn = ISOTCPConnection("127.0.0.1") + frame = conn._build_tpkt(b"") + + assert len(frame) == 4 + length = struct.unpack(">H", frame[2:4])[0] + assert length == 4 + + def test_tpkt_large_payload(self) -> None: + """Length field correctly handles large payloads.""" + conn = ISOTCPConnection("127.0.0.1") + payload = b"\x00" * 1000 + frame = conn._build_tpkt(payload) + + length = struct.unpack(">H", frame[2:4])[0] + assert length == 1004 + + +@pytest.mark.conformance +class TestCOTPConformance: + """Verify COTP PDU encoding per ISO 8073.""" + + def test_cotp_cr_pdu_type(self) -> None: + """CR PDU type code is 0xE0.""" + conn = ISOTCPConnection("127.0.0.1") + cr = conn._build_cotp_cr() + assert cr[1] == 0xE0 + + def test_cotp_cr_destination_reference_zero(self) -> None: + """CR destination reference must be 0x0000.""" + conn = ISOTCPConnection("127.0.0.1") + cr = conn._build_cotp_cr() + dst_ref = struct.unpack(">H", cr[2:4])[0] + assert dst_ref == 0x0000 + + def test_cotp_cr_source_reference(self) -> None: + """CR source reference matches connection setting.""" + conn = ISOTCPConnection("127.0.0.1") + conn.src_ref = 0x1234 + cr = conn._build_cotp_cr() + src_ref = struct.unpack(">H", cr[4:6])[0] + assert src_ref == 0x1234 + + def test_cotp_cr_class_zero(self) -> None: + """CR class/option byte is 0x00 (Class 0, no extended formats).""" + conn = ISOTCPConnection("127.0.0.1") + cr = conn._build_cotp_cr() + assert cr[6] == 0x00 + + def test_cotp_cr_contains_tsap_parameters(self) -> None: + """CR includes calling TSAP (0xC1) and called TSAP (0xC2) parameters.""" + conn = ISOTCPConnection("127.0.0.1", local_tsap=0x0100, remote_tsap=0x0102) + cr = conn._build_cotp_cr() + # Search for parameter codes in the parameter section + param_data = cr[7:] # Parameters start after the 7-byte base header + param_codes = [] + offset = 0 + while offset < len(param_data): + param_codes.append(param_data[offset]) + param_len = param_data[offset + 1] + offset += 2 + param_len + assert 0xC1 in param_codes, "Must contain calling TSAP parameter" + assert 0xC2 in param_codes, "Must contain called TSAP parameter" + + def test_cotp_cr_pdu_size_parameter(self) -> None: + """CR includes PDU size parameter (0xC0).""" + conn = ISOTCPConnection("127.0.0.1") + cr = conn._build_cotp_cr() + param_data = cr[7:] + param_codes = [] + offset = 0 + while offset < len(param_data): + param_codes.append(param_data[offset]) + param_len = param_data[offset + 1] + offset += 2 + param_len + assert 0xC0 in param_codes, "Must contain PDU size parameter" + + def test_cotp_dt_pdu_format(self) -> None: + """DT PDU: length=2, type=0xF0, EOT=0x80.""" + conn = ISOTCPConnection("127.0.0.1") + dt = conn._build_cotp_dt(b"\x01\x02") + assert dt[0] == 2, "DT PDU length must be 2" + assert dt[1] == 0xF0, "DT PDU type must be 0xF0" + assert dt[2] == 0x80, "EOT+number must be 0x80" + + def test_cotp_dt_carries_data(self) -> None: + """DT PDU correctly carries the S7 data payload.""" + conn = ISOTCPConnection("127.0.0.1") + payload = b"\xde\xad\xbe\xef" + dt = conn._build_cotp_dt(payload) + assert dt[3:] == payload + + def test_cotp_cc_parsing(self) -> None: + """CC PDU parsing extracts destination reference.""" + conn = ISOTCPConnection("127.0.0.1") + # Build a minimal CC: pdu_len, type=0xD0, dst_ref, src_ref, class + cc = struct.pack(">BBHHB", 6, 0xD0, 0x0042, 0x0001, 0x00) + conn._parse_cotp_cc(cc) + assert conn.dst_ref == 0x0042 + + def test_cotp_cc_wrong_type_rejected(self) -> None: + """Non-CC PDU type raises error.""" + conn = ISOTCPConnection("127.0.0.1") + bad_cc = struct.pack(">BBHHB", 6, 0xE0, 0x0000, 0x0001, 0x00) + with pytest.raises(S7ConnectionError, match="Expected COTP CC"): + conn._parse_cotp_cc(bad_cc) + + def test_cotp_cc_too_short_rejected(self) -> None: + """CC PDU shorter than 7 bytes is rejected.""" + conn = ISOTCPConnection("127.0.0.1") + with pytest.raises(S7ConnectionError, match="too short"): + conn._parse_cotp_cc(b"\x06\xd0\x00") + + def test_cotp_data_parsing(self) -> None: + """Data parsing extracts payload from DT PDU.""" + conn = ISOTCPConnection("127.0.0.1") + cotp_pdu = struct.pack(">BBB", 2, 0xF0, 0x80) + b"\x32\x01\x02\x03" + data = conn._parse_cotp_data(cotp_pdu) + assert data == b"\x32\x01\x02\x03" + + def test_cotp_data_wrong_type_rejected(self) -> None: + """Non-DT PDU type in data parsing raises error.""" + conn = ISOTCPConnection("127.0.0.1") + bad_dt = struct.pack(">BBB", 2, 0xE0, 0x80) + b"\x01" + with pytest.raises(S7ConnectionError, match="Expected COTP DT"): + conn._parse_cotp_data(bad_dt) + + def test_cotp_data_too_short_rejected(self) -> None: + """DT PDU shorter than 3 bytes is rejected.""" + conn = ISOTCPConnection("127.0.0.1") + with pytest.raises(S7ConnectionError, match="too short"): + conn._parse_cotp_data(b"\x02\xf0") + + +@pytest.mark.conformance +class TestS7HeaderConformance: + """Verify S7 PDU header encoding.""" + + def test_protocol_id(self) -> None: + """S7 protocol ID is always 0x32.""" + proto = S7Protocol() + pdu = proto.build_read_request(S7Area.DB, 1, 0, S7WordLen.BYTE, 1) + assert pdu[0] == 0x32 + + def test_request_pdu_type(self) -> None: + """Read/write requests use PDU type 0x01 (REQUEST).""" + proto = S7Protocol() + read_pdu = proto.build_read_request(S7Area.DB, 1, 0, S7WordLen.BYTE, 1) + assert read_pdu[1] == S7PDUType.REQUEST + + proto2 = S7Protocol() + write_pdu = proto2.build_write_request(S7Area.DB, 1, 0, S7WordLen.BYTE, b"\x00") + assert write_pdu[1] == S7PDUType.REQUEST + + def test_header_reserved_zero(self) -> None: + """Reserved field (bytes 2-3) is always 0x0000.""" + proto = S7Protocol() + pdu = proto.build_read_request(S7Area.DB, 1, 0, S7WordLen.BYTE, 1) + reserved = struct.unpack(">H", pdu[2:4])[0] + assert reserved == 0x0000 + + def test_sequence_number_increments(self) -> None: + """Sequence number increments with each request.""" + proto = S7Protocol() + pdu1 = proto.build_read_request(S7Area.DB, 1, 0, S7WordLen.BYTE, 1) + pdu2 = proto.build_read_request(S7Area.DB, 1, 0, S7WordLen.BYTE, 1) + seq1 = struct.unpack(">H", pdu1[4:6])[0] + seq2 = struct.unpack(">H", pdu2[4:6])[0] + assert seq2 == seq1 + 1 + + def test_header_is_12_bytes(self) -> None: + """S7 request header is exactly 12 bytes (proto, type, reserved, seq, param_len, data_len).""" + proto = S7Protocol() + pdu = proto.build_setup_communication_request() + # Header: proto(1) + type(1) + reserved(2) + seq(2) + param_len(2) + data_len(2) = 10 + # Actually for REQUEST type it's 10 bytes + assert pdu[0] == 0x32 + assert len(pdu) >= 10 + + +@pytest.mark.conformance +class TestS7FunctionCodes: + """Verify S7 function codes match the specification.""" + + def test_read_area_function_code(self) -> None: + """Read area function code is 0x04.""" + proto = S7Protocol() + pdu = proto.build_read_request(S7Area.DB, 1, 0, S7WordLen.BYTE, 1) + # Function code is first byte of parameter section (after 10-byte header) + assert pdu[10] == 0x04 + + def test_write_area_function_code(self) -> None: + """Write area function code is 0x05.""" + proto = S7Protocol() + pdu = proto.build_write_request(S7Area.DB, 1, 0, S7WordLen.BYTE, b"\x00") + assert pdu[10] == 0x05 + + def test_setup_communication_function_code(self) -> None: + """Setup communication function code is 0xF0.""" + proto = S7Protocol() + pdu = proto.build_setup_communication_request() + assert pdu[10] == 0xF0 + + def test_plc_control_function_code(self) -> None: + """PLC control function code is 0x28.""" + proto = S7Protocol() + pdu = proto.build_plc_control_request("hot_start") + assert pdu[10] == 0x28 + + +@pytest.mark.conformance +class TestS7AreaCodes: + """Verify S7 area codes match the specification.""" + + def test_area_code_pe(self) -> None: + assert S7Area.PE.value == 0x81 + + def test_area_code_pa(self) -> None: + assert S7Area.PA.value == 0x82 + + def test_area_code_mk(self) -> None: + assert S7Area.MK.value == 0x83 + + def test_area_code_db(self) -> None: + assert S7Area.DB.value == 0x84 + + def test_area_code_ct(self) -> None: + assert S7Area.CT.value == 0x1C + + def test_area_code_tm(self) -> None: + assert S7Area.TM.value == 0x1D + + +@pytest.mark.conformance +class TestS7WordLenCodes: + """Verify S7 word length codes match the specification.""" + + def test_wordlen_bit(self) -> None: + assert S7WordLen.BIT.value == 0x01 + + def test_wordlen_byte(self) -> None: + assert S7WordLen.BYTE.value == 0x02 + + def test_wordlen_char(self) -> None: + assert S7WordLen.CHAR.value == 0x03 + + def test_wordlen_word(self) -> None: + assert S7WordLen.WORD.value == 0x04 + + def test_wordlen_int(self) -> None: + assert S7WordLen.INT.value == 0x05 + + def test_wordlen_dword(self) -> None: + assert S7WordLen.DWORD.value == 0x06 + + def test_wordlen_dint(self) -> None: + assert S7WordLen.DINT.value == 0x07 + + def test_wordlen_real(self) -> None: + assert S7WordLen.REAL.value == 0x08 + + def test_wordlen_counter(self) -> None: + assert S7WordLen.COUNTER.value == 0x1C + + def test_wordlen_timer(self) -> None: + assert S7WordLen.TIMER.value == 0x1D + + +@pytest.mark.conformance +class TestS7PDUTypes: + """Verify S7 PDU type codes match the specification.""" + + def test_pdu_type_request(self) -> None: + assert S7PDUType.REQUEST.value == 0x01 + + def test_pdu_type_ack(self) -> None: + assert S7PDUType.ACK.value == 0x02 + + def test_pdu_type_ack_data(self) -> None: + assert S7PDUType.ACK_DATA.value == 0x03 + + def test_pdu_type_userdata(self) -> None: + assert S7PDUType.USERDATA.value == 0x07 + + +@pytest.mark.conformance +class TestS7ReadRequestEncoding: + """Verify read request PDU structure.""" + + def test_read_request_item_count(self) -> None: + """Read request has item count = 1.""" + proto = S7Protocol() + pdu = proto.build_read_request(S7Area.DB, 1, 0, S7WordLen.BYTE, 4) + assert pdu[11] == 0x01 # Item count + + def test_read_request_variable_spec(self) -> None: + """Variable specification marker is 0x12.""" + proto = S7Protocol() + pdu = proto.build_read_request(S7Area.DB, 1, 0, S7WordLen.BYTE, 4) + assert pdu[12] == 0x12 + + def test_read_request_data_length_zero(self) -> None: + """Read requests have data length = 0.""" + proto = S7Protocol() + pdu = proto.build_read_request(S7Area.DB, 1, 0, S7WordLen.BYTE, 4) + data_len = struct.unpack(">H", pdu[8:10])[0] + assert data_len == 0 + + def test_read_request_parameter_length(self) -> None: + """Read request parameter length is 14 (function + count + address spec).""" + proto = S7Protocol() + pdu = proto.build_read_request(S7Area.DB, 1, 0, S7WordLen.BYTE, 4) + param_len = struct.unpack(">H", pdu[6:8])[0] + assert param_len == 14 + + +@pytest.mark.conformance +class TestS7WriteRequestEncoding: + """Verify write request PDU structure.""" + + def test_write_request_has_data_section(self) -> None: + """Write requests include a data section.""" + proto = S7Protocol() + data = b"\x01\x02\x03\x04" + pdu = proto.build_write_request(S7Area.DB, 1, 0, S7WordLen.BYTE, data) + data_len = struct.unpack(">H", pdu[8:10])[0] + assert data_len > 0 + + def test_write_request_data_section_structure(self) -> None: + """Write data section: reserved(1) + transport_size(1) + bit_length(2) + data.""" + proto = S7Protocol() + data = b"\x01\x02\x03\x04" + pdu = proto.build_write_request(S7Area.DB, 1, 0, S7WordLen.BYTE, data) + # Data section starts after header(10) + parameters(14) + data_section = pdu[24:] + assert data_section[0] == 0x00 # Reserved + assert len(data_section) >= 4 + len(data) # transport header + data + + def test_write_request_bit_length(self) -> None: + """Bit length in data section is data_bytes * 8.""" + proto = S7Protocol() + data = b"\x01\x02\x03\x04" + pdu = proto.build_write_request(S7Area.DB, 1, 0, S7WordLen.BYTE, data) + data_section = pdu[24:] + bit_length = struct.unpack(">H", data_section[2:4])[0] + assert bit_length == len(data) * 8 + + +@pytest.mark.conformance +class TestS7SetupCommunication: + """Verify setup communication PDU structure.""" + + def test_setup_comm_pdu_size(self) -> None: + """Setup communication encodes requested PDU size.""" + proto = S7Protocol() + pdu = proto.build_setup_communication_request(pdu_length=480) + # Parameter section: function(1) + reserved(1) + max_amq_caller(2) + max_amq_callee(2) + pdu_len(2) + param_start = 10 + pdu_length = struct.unpack(">H", pdu[param_start + 6 : param_start + 8])[0] + assert pdu_length == 480 + + def test_setup_comm_amq_values(self) -> None: + """Setup communication encodes AMQ caller/callee.""" + proto = S7Protocol() + pdu = proto.build_setup_communication_request(max_amq_caller=3, max_amq_callee=3, pdu_length=960) + param_start = 10 + amq_caller = struct.unpack(">H", pdu[param_start + 2 : param_start + 4])[0] + amq_callee = struct.unpack(">H", pdu[param_start + 4 : param_start + 6])[0] + assert amq_caller == 3 + assert amq_callee == 3 + + +@pytest.mark.conformance +class TestS7ResponseParsing: + """Verify S7 response PDU parsing.""" + + def test_parse_valid_ack_data(self) -> None: + """Valid ACK_DATA response parses without error.""" + proto = S7Protocol() + # Build a minimal ACK_DATA response: header(12 bytes) + pdu = struct.pack( + ">BBHHHHBB", + 0x32, # Protocol ID + S7PDUType.ACK_DATA, + 0x0000, # Reserved + 0x0001, # Sequence + 0x0000, # Parameter length + 0x0000, # Data length + 0x00, # Error class + 0x00, # Error code + ) + response = proto.parse_response(pdu) + assert response["sequence"] == 1 + assert response["error_code"] == 0 + + def test_parse_ack_response(self) -> None: + """ACK (write response) parses correctly.""" + proto = S7Protocol() + # ACK with function code + item count in parameters (min 2 bytes for write response) + pdu = struct.pack( + ">BBHHHHBB", + 0x32, + S7PDUType.ACK, + 0x0000, + 0x0005, + 0x0002, # Param length = 2 + 0x0000, # Data length + 0x00, + 0x00, + ) + struct.pack(">BB", S7Function.WRITE_AREA, 0x01) + response = proto.parse_response(pdu) + assert response["error_code"] == 0 + + def test_reject_invalid_protocol_id(self) -> None: + """Non-0x32 protocol ID raises error.""" + proto = S7Protocol() + pdu = struct.pack(">BBHHHHBB", 0x33, S7PDUType.ACK_DATA, 0, 1, 0, 0, 0, 0) + with pytest.raises(S7ProtocolError, match="Invalid protocol ID"): + proto.parse_response(pdu) + + def test_reject_request_pdu_type(self) -> None: + """REQUEST PDU type in response is rejected.""" + proto = S7Protocol() + pdu = struct.pack(">BBHHHHBB", 0x32, S7PDUType.REQUEST, 0, 1, 0, 0, 0, 0) + with pytest.raises(S7ProtocolError, match="Expected response PDU"): + proto.parse_response(pdu) + + def test_reject_too_short_pdu(self) -> None: + """PDU shorter than 10 bytes is rejected.""" + proto = S7Protocol() + with pytest.raises(S7ProtocolError, match="too short"): + proto.parse_response(b"\x32\x03\x00") + + def test_error_class_raises(self) -> None: + """Non-zero error class raises S7ProtocolError.""" + proto = S7Protocol() + pdu = struct.pack(">BBHHHHBB", 0x32, S7PDUType.ACK_DATA, 0, 1, 0, 0, 0x81, 0x04) + with pytest.raises(S7ProtocolError): + proto.parse_response(pdu) + + +@pytest.mark.conformance +class TestS7ReturnCodes: + """Verify S7 return code definitions.""" + + def test_success_code(self) -> None: + assert S7_RETURN_CODES[0xFF] == "Success" + + def test_hardware_error_code(self) -> None: + assert S7_RETURN_CODES[0x01] == "Hardware error" + + def test_invalid_address_code(self) -> None: + assert S7_RETURN_CODES[0x05] == "Invalid address" + + def test_object_does_not_exist_code(self) -> None: + assert S7_RETURN_CODES[0x0A] == "Object does not exist" + + def test_all_codes_have_descriptions(self) -> None: + """Every defined return code has a non-empty description.""" + for code, desc in S7_RETURN_CODES.items(): + assert desc, f"Return code {code:#04x} has empty description" + + +@pytest.mark.conformance +class TestTPDUSizes: + """Verify TPDU size constants match ISO 8073.""" + + def test_tpdu_sizes_are_powers_of_two(self) -> None: + """Each TPDU size value is an exponent where actual_size = 2^value.""" + for size in TPDUSize: + actual = 1 << size.value + assert actual >= 128 + assert actual <= 8192 + + def test_tpdu_size_values(self) -> None: + assert TPDUSize.S_128.value == 0x07 + assert TPDUSize.S_256.value == 0x08 + assert TPDUSize.S_512.value == 0x09 + assert TPDUSize.S_1024.value == 0x0A + assert TPDUSize.S_2048.value == 0x0B + assert TPDUSize.S_4096.value == 0x0C + assert TPDUSize.S_8192.value == 0x0D From f0634f8ce4f443e059e33a8b08118736f32bd9f9 Mon Sep 17 00:00:00 2001 From: Gijs Molenaar Date: Fri, 20 Mar 2026 12:41:55 +0200 Subject: [PATCH 16/19] Add examples cookbook and troubleshooting documentation (#610) * Add examples cookbook and troubleshooting documentation Based on analysis of 312 issues and discussions, the two biggest sources of user confusion are S7-1200/1500 configuration and data type handling. These new pages address the most common questions. examples.rst: rack/slot reference table, PLC address mapping guide, complete data types cookbook (BOOL through DATE_AND_TIME), memory areas, analog I/O, multi-variable read, and server setup for testing. troubleshooting.rst: error message reference table, S7-1200/1500 TIA Portal configuration steps, connection recovery patterns, timeout configuration, thread safety, and protocol limitations FAQ. Co-Authored-By: Claude Opus 4.6 * Add PLC support matrix documentation Add a new page documenting which Siemens PLC families are supported, their protocol capabilities, PUT/GET configuration requirements, and alternatives for unsupported PLCs. Co-Authored-By: Claude Opus 4.6 --------- Co-authored-by: Claude Opus 4.6 --- doc/examples.rst | 629 ++++++++++++++++++++++++++++++++++++++++ doc/index.rst | 3 + doc/plc-support.rst | 163 +++++++++++ doc/troubleshooting.rst | 283 ++++++++++++++++++ 4 files changed, 1078 insertions(+) create mode 100644 doc/examples.rst create mode 100644 doc/plc-support.rst create mode 100644 doc/troubleshooting.rst diff --git a/doc/examples.rst b/doc/examples.rst new file mode 100644 index 00000000..dd4d713a --- /dev/null +++ b/doc/examples.rst @@ -0,0 +1,629 @@ +Examples & Cookbook +=================== + +This page provides practical examples for common python-snap7 tasks. All code +assumes you have already installed python-snap7: + +.. code-block:: bash + + pip install python-snap7 + + +Connecting to Different PLC Models +----------------------------------- + +Rack/Slot Reference +^^^^^^^^^^^^^^^^^^^ + +.. list-table:: + :header-rows: 1 + :widths: 20 10 10 60 + + * - PLC Model + - Rack + - Slot + - Notes + * - S7-300 + - 0 + - 2 + - + * - S7-400 + - 0 + - 3 + - May vary with multi-rack configurations + * - S7-1200 + - 0 + - 1 + - PUT/GET access must be enabled in TIA Portal + * - S7-1500 + - 0 + - 1 + - PUT/GET access must be enabled in TIA Portal + * - S7-200 / Logo + - -- + - -- + - Use ``set_connection_params`` with TSAP addressing + +.. warning:: + + S7-1200 and S7-1500 PLCs ship with PUT/GET communication disabled by + default. Enable it in TIA Portal under the CPU properties before + connecting. + +S7-300 +^^^^^^ + +.. code-block:: python + + import snap7 + + client = snap7.Client() + client.connect("192.168.1.10", 0, 2) + +S7-400 +^^^^^^ + +.. code-block:: python + + import snap7 + + client = snap7.Client() + client.connect("192.168.1.10", 0, 3) + +S7-1200 / S7-1500 +^^^^^^^^^^^^^^^^^^ + +.. code-block:: python + + import snap7 + + client = snap7.Client() + client.connect("192.168.1.10", 0, 1) + +S7-200 / Logo (TSAP Connection) +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: python + + import snap7 + + client = snap7.Client() + client.set_connection_params("192.168.1.10", 0x1000, 0x2000) + client.connect("192.168.1.10", 0, 0) + +Using a Non-Standard Port +^^^^^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: python + + import snap7 + + client = snap7.Client() + client.connect("192.168.1.10", 0, 1, tcp_port=1102) + + +Address Mapping Guide +--------------------- + +PLC addresses in Siemens TIA Portal / STEP 7 map to python-snap7 API calls +as follows. + +.. list-table:: + :header-rows: 1 + :widths: 25 40 35 + + * - PLC Address + - python-snap7 Call + - Explanation + * - DB1.DBB0 + - ``db_read(1, 0, 1)`` + - 1 byte at offset 0 of DB1 + * - DB1.DBW10 + - ``db_read(1, 10, 2)`` + - 2 bytes (WORD) at offset 10 + * - DB1.DBD20 + - ``db_read(1, 20, 4)`` + - 4 bytes (DWORD) at offset 20 + * - DB1.DBX0.3 + - ``db_read(1, 0, 1)`` then ``get_bool(data, 0, 3)`` + - Bit 3 of byte 0 + * - M0.0 + - ``mb_read(0, 1)`` then ``get_bool(data, 0, 0)`` + - Bit 0 of merker byte 0 + * - MW10 + - ``mb_read(10, 2)`` + - 2 bytes (WORD) from merker byte 10 + * - IW0 / EW0 + - ``read_area(Area.PE, 0, 0, 2)`` + - Analog input word at address 0 + * - QW0 / AW0 + - ``read_area(Area.PA, 0, 0, 2)`` + - Analog output word at address 0 + +.. important:: + + The ``byte_index`` parameter in all ``snap7.util`` getter/setter functions + is **relative to the returned bytearray**, not the absolute PLC address. + + For example, to read DB1.DBX10.3: + + .. code-block:: python + + data = client.db_read(1, 10, 1) # Read 1 byte starting at offset 10 + value = snap7.util.get_bool(data, 0, 3) # byte_index=0, NOT 10 + + You read from PLC offset 10, but ``data[0]`` *is* byte 10 from the PLC. + + +Data Types Cookbook +------------------- + +Each example below shows a complete read and write cycle. + +BOOL +^^^^ + +Booleans require a **read-modify-write** pattern. You cannot write a single +bit to the PLC; you must read the enclosing byte, change the bit, then write +the whole byte back. + +.. code-block:: python + + import snap7 + + client = snap7.Client() + client.connect("192.168.1.10", 0, 1) + + # Read DB1.DBX0.3 (bit 3 of byte 0) + data = client.db_read(1, 0, 1) + value = snap7.util.get_bool(data, 0, 3) + print(f"DB1.DBX0.3 = {value}") + + # Write DB1.DBX0.3 -- read first, then modify, then write + data = client.db_read(1, 0, 1) + snap7.util.set_bool(data, 0, 3, True) + client.db_write(1, 0, data) + +.. warning:: + + Never write a freshly created ``bytearray`` for booleans. Always read the + current byte first to avoid overwriting neighboring bits. + +BYTE (1 byte, unsigned 0--255) +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: python + + # Read DB1.DBB0 (1 byte at offset 0) + data = client.db_read(1, 0, 1) + value = snap7.util.get_byte(data, 0) + print(f"DB1.DBB0 = {value}") + + # Write + data = bytearray(1) + snap7.util.set_byte(data, 0, 200) + client.db_write(1, 0, data) + +INT (2 bytes, signed -32768 to 32767) +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: python + + # Read DB1.DBW10 + data = client.db_read(1, 10, 2) + value = snap7.util.get_int(data, 0) + print(f"DB1.DBW10 = {value}") + + # Write + data = bytearray(2) + snap7.util.set_int(data, 0, -1234) + client.db_write(1, 10, data) + +WORD (2 bytes, unsigned 0--65535) +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: python + + # Read DB1.DBW20 + data = client.db_read(1, 20, 2) + value = snap7.util.get_word(data, 0) + print(f"DB1.DBW20 = {value}") + + # Write + data = bytearray(2) + snap7.util.set_word(data, 0, 50000) + client.db_write(1, 20, data) + +DINT (4 bytes, signed -2147483648 to 2147483647) +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: python + + # Read DB1.DBD30 + data = client.db_read(1, 30, 4) + value = snap7.util.get_dint(data, 0) + print(f"DB1.DBD30 = {value}") + + # Write + data = bytearray(4) + snap7.util.set_dint(data, 0, 100000) + client.db_write(1, 30, data) + +DWORD (4 bytes, unsigned 0--4294967295) +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: python + + # Read DB1.DBD40 + data = client.db_read(1, 40, 4) + value = snap7.util.get_dword(data, 0) + print(f"DB1.DBD40 = {value}") + + # Write + data = bytearray(4) + snap7.util.set_dword(data, 0, 3000000000) + client.db_write(1, 40, data) + +REAL (4 bytes, IEEE 754 float) +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: python + + # Read DB1.DBD50 + data = client.db_read(1, 50, 4) + value = snap7.util.get_real(data, 0) + print(f"DB1.DBD50 = {value}") + + # Write + data = bytearray(4) + snap7.util.set_real(data, 0, 3.14) + client.db_write(1, 50, data) + +LREAL (8 bytes, IEEE 754 double) +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: python + + # Read DB1, offset 60, 8 bytes + data = client.db_read(1, 60, 8) + value = snap7.util.get_lreal(data, 0) + print(f"LREAL = {value}") + + # Write + data = bytearray(8) + snap7.util.set_lreal(data, 0, 3.141592653589793) + client.db_write(1, 60, data) + +STRING (2 header bytes + characters) +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +S7 strings have a specific format: + +- **Byte 0**: Maximum length (set when the variable is declared in the PLC) +- **Byte 1**: Actual (current) length of the string content +- **Bytes 2+**: ASCII characters + +When reading, always request ``max_length + 2`` bytes to include the header. + +.. code-block:: python + + # Read a string at DB1, offset 10, declared as STRING[20] in the PLC + max_length = 20 + data = client.db_read(1, 10, max_length + 2) # 20 + 2 header bytes = 22 + text = snap7.util.get_string(data, 0) + print(f"String = '{text}'") + + # Write a string + data = client.db_read(1, 10, max_length + 2) + snap7.util.set_string(data, 0, "Hello", max_length) + client.db_write(1, 10, data) + +.. note:: + + Always read the existing data before writing a string. The + ``set_string`` function preserves the max-length header byte and pads + unused characters with spaces. + +DATE_AND_TIME (8 bytes, BCD encoded) +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: python + + from datetime import datetime + + # Read DATE_AND_TIME at DB1, offset 70 (returns ISO 8601 string) + data = client.db_read(1, 70, 8) + dt_string = snap7.util.get_dt(data, 0) + print(f"DATE_AND_TIME = {dt_string}") # e.g. '2024-06-15T14:30:00.000000' + + # Parse to Python datetime if needed + dt_obj = datetime.fromisoformat(dt_string) + + # Write DATE_AND_TIME + data = client.db_read(1, 70, 8) + snap7.util.set_dt(data, 0, datetime(2024, 6, 15, 14, 30, 0)) + client.db_write(1, 70, data) + + +Memory Areas +------------ + +python-snap7 provides convenience methods for data blocks and merkers, and +the generic ``read_area`` / ``write_area`` for all other areas. + +Data Blocks (DB) +^^^^^^^^^^^^^^^^ + +.. code-block:: python + + # Read 10 bytes from DB1 starting at offset 0 + data = client.db_read(1, 0, 10) + + # Write 4 bytes to DB1 starting at offset 0 + client.db_write(1, 0, bytearray([0x01, 0x02, 0x03, 0x04])) + +Merkers / Flags (M) +^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: python + + # Read 4 merker bytes starting at MB0 + data = client.mb_read(0, 4) + + # Write 2 bytes starting at MB10 + client.mb_write(10, 2, bytearray([0xFF, 0x00])) + +Inputs (I / E) +^^^^^^^^^^^^^^ + +.. code-block:: python + + from snap7.type import Area + + # Read 2 input bytes starting at IB0 + data = client.read_area(Area.PE, 0, 0, 2) + +Outputs (Q / A) +^^^^^^^^^^^^^^^ + +.. code-block:: python + + from snap7.type import Area + + # Read 2 output bytes starting at QB0 + data = client.read_area(Area.PA, 0, 0, 2) + + # Write to QB0 + client.write_area(Area.PA, 0, 0, bytearray([0x00, 0xFF])) + +Timers (T) +^^^^^^^^^^ + +.. code-block:: python + + from snap7.type import Area + + # Read timer T0 (1 timer = 2 bytes) + data = client.read_area(Area.TM, 0, 0, 1) + +Counters (C) +^^^^^^^^^^^^^ + +.. code-block:: python + + from snap7.type import Area + + # Read counter C0 (1 counter = 2 bytes) + data = client.read_area(Area.CT, 0, 0, 1) + + +Analog I/O +----------- + +Analog inputs are typically 16-bit integers in the peripheral input area +(``Area.PE``). The raw value from the PLC needs to be scaled to engineering +units. + +Reading Analog Inputs +^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: python + + import snap7 + from snap7.type import Area + + client = snap7.Client() + client.connect("192.168.1.10", 0, 1) + + # Read AIW0 (analog input word at address 0) + data = client.read_area(Area.PE, 0, 0, 2) + raw_value = snap7.util.get_int(data, 0) + print(f"Raw value: {raw_value}") + + # Scale to engineering units + # S7 analog modules typically use 0-27648 for 0-100% range + min_range = 0.0 # e.g., 0 bar + max_range = 10.0 # e.g., 10 bar + scaled = raw_value * (max_range - min_range) / 27648.0 + min_range + print(f"Pressure: {scaled:.2f} bar") + + # Read AIW2 (second analog input) + data = client.read_area(Area.PE, 0, 2, 2) + raw_value = snap7.util.get_int(data, 0) + +Writing Analog Outputs +^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: python + + from snap7.type import Area + + # Write to AQW0 (analog output word at address 0) + data = bytearray(2) + snap7.util.set_int(data, 0, 13824) # ~50% of 27648 + client.write_area(Area.PA, 0, 0, data) + +.. note:: + + The standard scaling factor 27648 applies to most Siemens analog I/O + modules. Check your module documentation for the actual range. + + +Multi-Variable Read +------------------- + +The ``read_multi_vars`` method reads multiple variables in a single PDU +request, which is significantly faster than individual reads. + +.. code-block:: python + + import snap7 + from snap7.type import Area, WordLen, S7DataItem + from ctypes import c_uint8, cast, POINTER + + client = snap7.Client() + client.connect("192.168.1.10", 0, 1) + + # Prepare items to read + items = [] + + # Item 1: 4 bytes from DB1, offset 0 + item1 = S7DataItem() + item1.Area = Area.DB + item1.WordLen = WordLen.Byte + item1.DBNumber = 1 + item1.Start = 0 + item1.Amount = 4 + buffer1 = (c_uint8 * 4)() + item1.pData = cast(buffer1, POINTER(c_uint8)) + items.append(item1) + + # Item 2: 2 bytes from DB2, offset 10 + item2 = S7DataItem() + item2.Area = Area.DB + item2.WordLen = WordLen.Byte + item2.DBNumber = 2 + item2.Start = 10 + item2.Amount = 2 + buffer2 = (c_uint8 * 2)() + item2.pData = cast(buffer2, POINTER(c_uint8)) + items.append(item2) + + # Execute the multi-read + result, data_items = client.read_multi_vars(items) + + # Access the returned data + value1 = bytearray(buffer1) + value2 = bytearray(buffer2) + +.. warning:: + + The S7 protocol limits multi-variable reads to **20 items** per request. + If you need more, split them across multiple calls. + + +Server Setup for Testing +------------------------- + +The built-in server lets you test your client code without a physical PLC. + +Basic Server Example +^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: python + + from snap7.server import Server + from snap7.type import SrvArea + from ctypes import c_char + + # Create and configure the server + server = Server() + + # Register a data block (DB1) with 100 bytes + db_size = 100 + db_data = bytearray(db_size) + db_array = (c_char * db_size).from_buffer(db_data) + server.register_area(SrvArea.DB, 1, db_array) + + # Start the server on a non-privileged port + server.start(tcp_port=1102) + +Client-Server Round Trip +^^^^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: python + + import snap7 + from snap7.server import Server + from snap7.type import SrvArea + from ctypes import c_char + + # --- Server setup --- + server = Server() + db_size = 100 + db_data = bytearray(db_size) + db_array = (c_char * db_size).from_buffer(db_data) + server.register_area(SrvArea.DB, 1, db_array) + server.start(tcp_port=1102) + + # --- Client connection --- + client = snap7.Client() + client.connect("127.0.0.1", 0, 1, tcp_port=1102) + + # Write data + client.db_write(1, 0, bytearray([0x01, 0x02, 0x03, 0x04])) + + # Read it back + data = client.db_read(1, 0, 4) + print(f"Read back: {list(data)}") # [1, 2, 3, 4] + + # Clean up + client.disconnect() + server.stop() + +Registering Multiple Areas +^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +.. code-block:: python + + from snap7.server import Server + from snap7.type import SrvArea + from ctypes import c_char + + server = Server() + + # Register DB1 + db1_data = bytearray(100) + db1 = (c_char * 100).from_buffer(db1_data) + server.register_area(SrvArea.DB, 1, db1) + + # Register DB2 + db2_data = bytearray(200) + db2 = (c_char * 200).from_buffer(db2_data) + server.register_area(SrvArea.DB, 2, db2) + + # Register merker area (256 bytes) + mk_data = bytearray(256) + mk = (c_char * 256).from_buffer(mk_data) + server.register_area(SrvArea.MK, 0, mk) + + server.start(tcp_port=1102) + +.. note:: + + Use a port number above 1024 (e.g., 1102) to avoid requiring root/admin + privileges. Port 102 is the standard S7 port but is in the privileged + range. + +Using the Mainloop Helper +^^^^^^^^^^^^^^^^^^^^^^^^^^ + +For quick testing, the ``mainloop`` function starts a server with common +data blocks pre-registered: + +.. code-block:: python + + from snap7.server import mainloop + + # Blocks the current thread + mainloop(tcp_port=1102) diff --git a/doc/index.rst b/doc/index.rst index e42a66d5..927d0c57 100644 --- a/doc/index.rst +++ b/doc/index.rst @@ -8,6 +8,9 @@ Contents: introduction installation + plc-support + examples + troubleshooting development API/client diff --git a/doc/plc-support.rst b/doc/plc-support.rst new file mode 100644 index 00000000..b468eeac --- /dev/null +++ b/doc/plc-support.rst @@ -0,0 +1,163 @@ +PLC Support Matrix +================== + +This page documents which Siemens PLC families are supported by python-snap7, +the communication protocols they use, and any configuration requirements. + +Supported PLCs +-------------- + +.. list-table:: + :header-rows: 1 + :widths: 20 10 10 10 10 15 25 + + * - PLC Family + - Introduced + - S7 (classic) + - S7CommPlus V1 + - S7CommPlus V2/V3 + - python-snap7 support + - Notes + * - S7-300 + - ~1994 + - Yes + - No + - No + - **Full** + - Works out of the box. + * - S7-400 + - ~1996 + - Yes + - No + - No + - **Full** + - Works out of the box. + * - S7-1200 (FW ≤3) + - 2009 + - Yes + - No + - No + - **Full** + - Enable PUT/GET access in TIA Portal. + * - S7-1200 (FW 4+) + - ~2014 + - Yes + - Yes + - No + - **Full** + - Enable PUT/GET access in TIA Portal. Uses classic S7. + * - S7-1500 (FW 1.x) + - 2012 + - PUT/GET only + - Yes + - No + - **Full** + - Enable PUT/GET access in TIA Portal. + * - S7-1500 (FW 2.x) + - ~2016 + - PUT/GET only + - No + - V2 + - **PUT/GET only** + - S7CommPlus V2 is encrypted; not supported by any open-source library. + * - S7-1500 (FW 3.x+) + - ~2022 + - PUT/GET only + - No + - V3 + - **PUT/GET only** + - S7CommPlus V3 uses TLS; not supported by any open-source library. + * - S7-1500R/H + - ~2019 + - No + - No + - V2/V3 + - **Not supported** + - Redundant CPUs; no classic S7 fallback available. + * - ET 200SP CPU + - ~2014 + - PUT/GET only + - Yes + - Yes + - **PUT/GET only** + - Same behavior as S7-1500 with matching firmware. + * - S7-200 SMART + - ~2012 + - Subset + - No + - No + - **Partial** + - Basic read/write works. Some advanced functions may not be available. + * - LOGO! 8 + - ~2014 + - Subset + - No + - No + - **Full** + - Use the :class:`~snap7.logo.Logo` class. + + +Enabling PUT/GET Access +----------------------- + +For S7-1200 and S7-1500 PLCs, classic S7 protocol access requires the +**PUT/GET** option to be enabled: + +1. Open TIA Portal and go to the PLC properties. +2. Navigate to **Protection & Security** → **Connection mechanisms**. +3. Check **Permit access with PUT/GET communication from remote partner**. +4. Download the configuration to the PLC. + +.. warning:: + + PUT/GET access provides unauthenticated read/write access to PLC memory. + Only enable this on networks that are properly segmented and secured. + + +Protocol Overview +----------------- + +Siemens has evolved their PLC communication protocols over time: + +.. list-table:: + :header-rows: 1 + :widths: 20 15 15 50 + + * - Protocol + - Encryption + - Authentication + - Used by + * - S7 (classic) + - None + - None + - S7-300, S7-400, S7-1200, S7-1500 (PUT/GET mode) + * - S7CommPlus V1 + - None + - Challenge-response + - S7-1200 FW 4+, S7-1500 FW 1.x + * - S7CommPlus V2 + - Proprietary + - Yes + - S7-1500 FW 2.x + * - S7CommPlus V3 + - TLS + - Certificate-based + - S7-1500 FW 3.x+ + +python-snap7 implements the **classic S7 protocol**, which remains available +on most PLC families via the PUT/GET mechanism. For PLCs that only support +S7CommPlus V2 or V3 (such as the S7-1500R/H), no open-source solution +currently exists — consider using OPC UA as an alternative. + + +Alternatives for Unsupported PLCs +--------------------------------- + +If your PLC is not supported by python-snap7, consider these alternatives: + +- **OPC UA**: S7-1500 PLCs (FW 2.0+) include a built-in OPC UA server. Use + a Python OPC UA client such as `opcua-asyncio `_. +- **TIA Portal**: Siemens' official engineering tool supports all protocols + and PLC families. +- **PROFINET**: For real-time communication needs, PROFINET may be more + appropriate than S7 communication. diff --git a/doc/troubleshooting.rst b/doc/troubleshooting.rst new file mode 100644 index 00000000..27510632 --- /dev/null +++ b/doc/troubleshooting.rst @@ -0,0 +1,283 @@ +Troubleshooting +=============== + +This page covers the most common issues encountered when using python-snap7 +and how to resolve them. + +.. contents:: On this page + :local: + :depth: 2 + + +Error Message Reference +----------------------- + +The following table maps common S7 error strings to their likely cause and fix. + +.. list-table:: + :header-rows: 1 + :widths: 35 30 35 + + * - Error message + - Likely cause + - Fix + * - ``CLI : function refused by CPU (Unknown error)`` + - PUT/GET communication is not enabled on the PLC, or the data block + still has optimized block access enabled. + - Enable PUT/GET in TIA Portal and disable optimized block access on each + DB. See :ref:`s7-1200-1500-configuration` below. + * - ``CPU : Function not available`` + - The requested function is not supported on this PLC model. S7-1200 and + S7-1500 PLCs restrict certain operations. + - Check Siemens documentation for your PLC model. Some functions are only + available on S7-300/400. + * - ``CPU : Item not available`` + - Wrong DB number, the DB does not exist, or the address is out of range. + - Verify the DB number exists on the PLC and that the offset and size are + within bounds. + * - ``CPU : Address out of range`` + - Reading or writing past the end of a DB or memory area. + - Check the DB size in TIA Portal and ensure ``start + size`` does not + exceed it. + * - ``CPU : Function not authorized for current protection level`` + - The PLC has password protection enabled. + - Remove or lower the protection level in TIA Portal under + Protection & Security. + * - ``ISO : An error occurred during recv TCP : Connection timed out`` + - Network issue: PLC is unreachable, a firewall is blocking port 102, or + the PLC is not responding. + - Check network connectivity (``ping``), verify firewall rules, and ensure + the PLC is powered on and reachable. + * - ``ISO : An error occurred during send TCP : Connection timed out`` + - Same as above. + - Same as above. + * - ``TCP : Unreachable peer`` + - The PLC is not reachable on the network. + - Verify IP address, subnet, and routing. Ensure the PLC Ethernet port is + connected and configured. + * - ``TCP : Connection reset`` / Socket error 32 (broken pipe) + - The connection to the PLC was lost unexpectedly. + - The PLC may have been restarted, the cable disconnected, or another + client took over the connection. See :ref:`connection-recovery` below. + + +.. _s7-1200-1500-configuration: + +S7-1200/1500 Configuration +-------------------------- + +S7-1200 and S7-1500 PLCs require specific configuration in TIA Portal before +python-snap7 can communicate with them. Without these settings, you will get +``CLI : function refused by CPU`` errors. + +Step 1: Enable PUT/GET Communication +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +1. Open your project in TIA Portal. +2. In the project tree, double-click on the PLC device. +3. Go to **Properties** > **Protection & Security** > **Connection mechanisms**. +4. Check **Permit access with PUT/GET communication from remote partner**. +5. Compile and download to the PLC. + +.. warning:: + + This setting allows any network client to read and write PLC memory without + authentication. Only enable this on isolated industrial networks. + +Step 2: Disable Optimized Block Access +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +This must be done for **each** data block you want to access: + +1. In the project tree, right-click on the data block (e.g., DB1). +2. Select **Properties**. +3. Go to the **Attributes** tab. +4. **Uncheck** "Optimized block access". +5. Click OK. +6. Compile and download to the PLC. + +.. warning:: + + Changing the "Optimized block access" setting reinitializes the data block, + which resets all values in that DB to their defaults. Do this before + commissioning, or back up your data first. + +Step 3: Compile and Download +^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +After making both changes: + +1. Compile the project (**Build** > **Compile**). +2. Download to the PLC (**Online** > **Download to device**). +3. The PLC may need to restart depending on the changes. + + +.. _connection-recovery: + +Connection Recovery +------------------- + +Network connections to PLCs can drop due to cable issues, PLC restarts, or +network problems. Use a reconnection pattern to handle this gracefully: + +.. code-block:: python + + import snap7 + import time + import logging + + logger = logging.getLogger(__name__) + + client = snap7.Client() + + def connect(address: str = "192.168.1.10", rack: int = 0, slot: int = 1) -> None: + client.connect(address, rack, slot) + + def safe_read(db: int, start: int, size: int) -> bytearray: + """Read from DB with automatic reconnection on failure.""" + try: + return client.db_read(db, start, size) + except Exception: + logger.warning("Read failed, attempting reconnection...") + try: + client.disconnect() + except Exception: + pass + time.sleep(1) + connect() + return client.db_read(db, start, size) + + def safe_write(db: int, start: int, data: bytearray) -> None: + """Write to DB with automatic reconnection on failure.""" + try: + client.db_write(db, start, data) + except Exception: + logger.warning("Write failed, attempting reconnection...") + try: + client.disconnect() + except Exception: + pass + time.sleep(1) + connect() + client.db_write(db, start, data) + +For long-running applications, wrap your main loop with reconnection logic: + +.. code-block:: python + + while True: + try: + data = safe_read(1, 0, 10) + # process data... + time.sleep(0.5) + except Exception: + logger.error("Failed after reconnection attempt, retrying in 5s...") + time.sleep(5) + + +Connection Timeout +------------------ + +The default connection timeout is 5 seconds. You can configure it by accessing +the underlying connection object: + +.. code-block:: python + + import snap7 + + client = snap7.Client() + + # Connect with a custom timeout (in seconds) + client.connect("192.168.1.10", 0, 1) + + # The timeout is set on the underlying connection + # Default is 5.0 seconds + client.connection.timeout = 10.0 # Set to 10 seconds + +To set the timeout **before** connecting, use ``set_connection_params`` and then +connect manually, or simply reconnect after adjusting: + +.. code-block:: python + + client = snap7.Client() + client.connect("192.168.1.10", 0, 1) + + # Adjust timeout for slow networks + client.connection.timeout = 15.0 + +.. note:: + + If you are experiencing frequent timeouts, check your network quality first. + Typical S7 communication on a local network should respond within + milliseconds. + + +Thread Safety +------------- + +The ``Client`` class is **not** thread-safe. Concurrent calls from multiple +threads on the same ``Client`` instance will corrupt the TCP connection state +and cause unpredictable errors. + +**Option 1: One client per thread** + +.. code-block:: python + + import threading + import snap7 + + def worker(address: str, rack: int, slot: int) -> None: + client = snap7.Client() + client.connect(address, rack, slot) + data = client.db_read(1, 0, 10) + client.disconnect() + + t1 = threading.Thread(target=worker, args=("192.168.1.10", 0, 1)) + t2 = threading.Thread(target=worker, args=("192.168.1.10", 0, 1)) + t1.start() + t2.start() + +**Option 2: Shared client with a lock** + +.. code-block:: python + + import threading + import snap7 + + client = snap7.Client() + client.connect("192.168.1.10", 0, 1) + lock = threading.Lock() + + def safe_read(db: int, start: int, size: int) -> bytearray: + with lock: + return client.db_read(db, start, size) + + +Protocol Limitations and FAQ +----------------------------- + +python-snap7 implements the S7 protocol over TCP/IP. The following operations +are **not possible** with this protocol: + +.. list-table:: + :header-rows: 1 + :widths: 40 60 + + * - Limitation + - Explanation + * - Read tag/symbol names from PLC + - Symbol names exist only in the TIA Portal project file, not in the PLC. + The S7 protocol only addresses data by area, DB number, and byte offset. + * - Get DB structure or layout from PLC + - The PLC stores only raw bytes. The structure definition lives in the TIA + Portal project. You must define your data layout in your Python code. + * - Discover PLCs on the network + - There is no S7 broadcast discovery mechanism. You must know the PLC's IP + address. + * - Create PLC backups + - Full project backup requires TIA Portal. python-snap7 can upload + individual blocks, but this is not a complete backup. + * - Access S7-1200/1500 PLCs with S7CommPlus security + - PLCs configured to require S7CommPlus encrypted communication cannot be + accessed with the classic S7 protocol. PUT/GET must be enabled as a + fallback. From b16c70780e7436255f17f40d7d61180f918e1a72 Mon Sep 17 00:00:00 2001 From: Gijs Molenaar Date: Fri, 20 Mar 2026 13:45:53 +0200 Subject: [PATCH 17/19] Cleanup: consolidate tests, docs, and README (#648) * Cleanup: consolidate tests, fix docs, remove README async section README: - Remove async support section (unnecessary on landing page) Documentation: - Add S7CommPlus API docs with experimental warning - Add experimental warning to AsyncClient docs - Update PLC support matrix for S7CommPlus V1/V2 status Test consolidation (no test logic changed): - Merge test_server_coverage.py into test_server.py - Merge test_partner_coverage.py into test_partner.py - Merge test_logo_coverage.py into test_logo_client.py - Merge test_db_coverage.py into test_util.py - Rename test_s7protocol_coverage.py to test_s7protocol.py Mypy fixes: - Widen Row.set_value type to accept date/datetime/timedelta - Add type annotations in test_s7protocol.py, test_partner.py, test_connection.py, test_async_client.py Co-Authored-By: Claude Opus 4.6 * Fix ruff formatting in test_util.py Co-Authored-By: Claude Opus 4.6 * Improve S7CommPlus test coverage and fix Codecov upload Add 154 new unit tests covering codec decoders, PValue parsing for all data types, payload builders/parsers, connection response parsing, and client error paths. S7CommPlus coverage rises from 77% to 87%, with codec.py reaching 100%. Also add CODECOV_TOKEN to the workflow to fix silent upload failures on protected branches. Co-Authored-By: Claude Opus 4.6 --------- Co-authored-by: Claude Opus 4.6 --- .github/workflows/test.yml | 1 + README.rst | 17 - doc/API/async_client.rst | 6 + doc/API/s7commplus.rst | 70 ++ doc/index.rst | 1 + doc/plc-support.rst | 8 +- snap7/util/db.py | 4 +- tests/test_async_client.py | 6 +- tests/test_connection.py | 6 +- tests/test_db_coverage.py | 546 --------------- tests/test_logo_client.py | 245 ++++++- tests/test_logo_coverage.py | 260 -------- tests/test_partner.py | 617 ++++++++++++++++- tests/test_partner_coverage.py | 625 ------------------ tests/test_s7commplus_codec.py | 462 ++++++++++++- tests/test_s7commplus_unit.py | 459 +++++++++++++ ...rotocol_coverage.py => test_s7protocol.py} | 14 +- tests/test_server.py | 360 +++++++++- tests/test_server_coverage.py | 375 ----------- tests/test_util.py | 540 ++++++++++++++- 20 files changed, 2771 insertions(+), 1851 deletions(-) create mode 100644 doc/API/s7commplus.rst delete mode 100644 tests/test_db_coverage.py delete mode 100644 tests/test_logo_coverage.py delete mode 100644 tests/test_partner_coverage.py create mode 100644 tests/test_s7commplus_unit.py rename tests/{test_s7protocol_coverage.py => test_s7protocol.py} (98%) delete mode 100644 tests/test_server_coverage.py diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml index 6b5a0de3..5d811c4c 100644 --- a/.github/workflows/test.yml +++ b/.github/workflows/test.yml @@ -38,4 +38,5 @@ jobs: uses: codecov/codecov-action@v5 with: files: coverage.xml + token: ${{ secrets.CODECOV_TOKEN }} fail_ci_if_error: false diff --git a/README.rst b/README.rst index 2b7cf5a3..f748fb5f 100644 --- a/README.rst +++ b/README.rst @@ -68,20 +68,3 @@ Install using pip:: $ pip install python-snap7 No native libraries or platform-specific dependencies are required — python-snap7 is a pure Python package that works on all platforms. - - -Async support -============= - -An ``AsyncClient`` is available for use with ``asyncio``:: - - import asyncio - import snap7 - - async def main(): - async with snap7.AsyncClient() as client: - await client.connect("192.168.1.10", 0, 1) - data = await client.db_read(1, 0, 4) - print(data) - - asyncio.run(main()) diff --git a/doc/API/async_client.rst b/doc/API/async_client.rst index 34e70b8a..0cf130fb 100644 --- a/doc/API/async_client.rst +++ b/doc/API/async_client.rst @@ -1,6 +1,12 @@ AsyncClient =========== +.. warning:: + + The ``AsyncClient`` is **experimental**. The API may change in future + releases. If you encounter problems, please `open an issue + `_. + The :class:`~snap7.async_client.AsyncClient` provides a native ``asyncio`` interface for communicating with Siemens S7 PLCs. It has feature parity with the synchronous :class:`~snap7.client.Client` and is safe for concurrent use diff --git a/doc/API/s7commplus.rst b/doc/API/s7commplus.rst new file mode 100644 index 00000000..4314bb4e --- /dev/null +++ b/doc/API/s7commplus.rst @@ -0,0 +1,70 @@ +S7CommPlus (S7-1200/1500) +========================= + +.. warning:: + + S7CommPlus support is **experimental**. The API may change in future + releases. If you encounter problems, please `open an issue + `_. + +The :mod:`snap7.s7commplus` package provides support for Siemens S7-1200 and +S7-1500 PLCs, which use the S7CommPlus protocol instead of the classic S7 +protocol used by S7-300/400. + +Both synchronous and asynchronous clients are available. When a PLC does not +support S7CommPlus data operations, the clients automatically fall back to the +legacy S7 protocol transparently. + +Synchronous client +------------------ + +.. code-block:: python + + from snap7.s7commplus.client import S7CommPlusClient + + client = S7CommPlusClient() + client.connect("192.168.1.10") + data = client.db_read(1, 0, 4) + client.disconnect() + +Asynchronous client +------------------- + +.. code-block:: python + + import asyncio + from snap7.s7commplus.async_client import S7CommPlusAsyncClient + + async def main(): + client = S7CommPlusAsyncClient() + await client.connect("192.168.1.10") + data = await client.db_read(1, 0, 4) + await client.disconnect() + + asyncio.run(main()) + +Legacy fallback +--------------- + +If the PLC returns an error for S7CommPlus data operations (common with some +firmware versions), the client automatically falls back to the classic S7 +protocol. You can check whether fallback is active: + +.. code-block:: python + + client.connect("192.168.1.10") + if client.using_legacy_fallback: + print("Using legacy S7 protocol") + +API reference +------------- + +.. automodule:: snap7.s7commplus.client + :members: + +.. automodule:: snap7.s7commplus.async_client + :members: + +.. automodule:: snap7.s7commplus.connection + :members: + :exclude-members: S7CommPlusConnection diff --git a/doc/index.rst b/doc/index.rst index 927d0c57..8066c63d 100644 --- a/doc/index.rst +++ b/doc/index.rst @@ -15,6 +15,7 @@ Contents: API/client API/async_client + API/s7commplus API/server API/partner API/logo diff --git a/doc/plc-support.rst b/doc/plc-support.rst index b468eeac..dfc1cda6 100644 --- a/doc/plc-support.rst +++ b/doc/plc-support.rst @@ -51,22 +51,22 @@ Supported PLCs - PUT/GET only - Yes - No - - **Full** - - Enable PUT/GET access in TIA Portal. + - **Full** (experimental S7CommPlus) + - S7CommPlus V1 session + legacy S7 fallback for data. * - S7-1500 (FW 2.x) - ~2016 - PUT/GET only - No - V2 - **PUT/GET only** - - S7CommPlus V2 is encrypted; not supported by any open-source library. + - S7CommPlus V2 support is in development. * - S7-1500 (FW 3.x+) - ~2022 - PUT/GET only - No - V3 - **PUT/GET only** - - S7CommPlus V3 uses TLS; not supported by any open-source library. + - S7CommPlus V3 uses proprietary crypto; not yet supported. * - S7-1500R/H - ~2019 - No diff --git a/snap7/util/db.py b/snap7/util/db.py index b3aaa2d9..48834898 100644 --- a/snap7/util/db.py +++ b/snap7/util/db.py @@ -636,7 +636,7 @@ def get_value(self, byte_index: Union[str, int], type_: str) -> ValueType: raise ValueError def set_value( - self, byte_index: Union[str, int], type_: str, value: Union[bool, str, float] + self, byte_index: Union[str, int], type_: str, value: Union[bool, str, float, date, datetime, timedelta] ) -> Optional[Union[bytearray, memoryview]]: """Sets the value for a specific type in the specified byte index. @@ -687,7 +687,7 @@ def set_value( set_wstring(bytearray_, byte_index, value, max_size_int) return None - if type_ == "REAL": + if type_ == "REAL" and isinstance(value, (bool, str, float, int)): return set_real(bytearray_, byte_index, value) if type_ == "LREAL" and isinstance(value, float): diff --git a/tests/test_async_client.py b/tests/test_async_client.py index 09c8b4a4..86f55617 100644 --- a/tests/test_async_client.py +++ b/tests/test_async_client.py @@ -5,7 +5,7 @@ import asyncio import logging -from collections.abc import Generator +from collections.abc import AsyncGenerator, Generator import pytest import pytest_asyncio @@ -45,10 +45,10 @@ def server() -> Generator[Server]: @pytest_asyncio.fixture -async def client(server: Server) -> AsyncClient: +async def client(server: Server) -> AsyncGenerator[AsyncClient]: c = AsyncClient() await c.connect(ip, rack, slot, tcpport) - yield c # type: ignore[misc] + yield c await c.disconnect() diff --git a/tests/test_connection.py b/tests/test_connection.py index 124956b0..ed784e67 100644 --- a/tests/test_connection.py +++ b/tests/test_connection.py @@ -13,9 +13,9 @@ class TestTPDUSize: """Test TPDUSize enum values.""" def test_sizes(self) -> None: - assert TPDUSize.S_128 == 0x07 - assert TPDUSize.S_1024 == 0x0A - assert TPDUSize.S_8192 == 0x0D + assert TPDUSize.S_128.value == 0x07 + assert TPDUSize.S_1024.value == 0x0A + assert TPDUSize.S_8192.value == 0x0D class TestISOTCPConnectionInit: diff --git a/tests/test_db_coverage.py b/tests/test_db_coverage.py deleted file mode 100644 index 660133fb..00000000 --- a/tests/test_db_coverage.py +++ /dev/null @@ -1,546 +0,0 @@ -"""Tests for snap7.util.db — DB/Row dict-like interface, read/write with mocked client, type conversions.""" - -import datetime -import logging -import struct -import pytest -from unittest.mock import MagicMock - -from snap7 import DB, Row -from snap7.type import Area -from snap7.util.db import print_row - -# Reuse the test spec and bytearray from test_util.py -test_spec = """ -4 ID INT -6 NAME STRING[4] - -12.0 testbool1 BOOL -12.1 testbool2 BOOL -13 testReal REAL -17 testDword DWORD -21 testint2 INT -23 testDint DINT -27 testWord WORD -29 testS5time S5TIME -31 testdateandtime DATE_AND_TIME -43 testusint0 USINT -44 testsint0 SINT -46 testTime TIME -50 testByte BYTE -51 testUint UINT -53 testUdint UDINT -57 testLreal LREAL -65 testChar CHAR -66 testWchar WCHAR -68 testWstring WSTRING[4] -80 testDate DATE -82 testTod TOD -86 testDtl DTL -98 testFstring FSTRING[8] -""" - -_bytearray = bytearray( - [ - 0, - 0, # test int - 4, - 4, - ord("t"), - ord("e"), - ord("s"), - ord("t"), # test string - 0x0F, # test bools - 68, - 78, - 211, - 51, # test real - 255, - 255, - 255, - 255, # test dword - 0, - 0, # test int 2 - 128, - 0, - 0, - 0, # test dint - 255, - 255, # test word - 0, - 16, # test s5time - 32, - 7, - 18, - 23, - 50, - 2, - 133, - 65, # date_and_time (8 bytes) - 254, - 254, - 254, - 254, - 254, # padding - 127, # usint - 128, # sint - 143, - 255, - 255, - 255, # time - 254, # byte - 48, - 57, # uint - 7, - 91, - 205, - 21, # udint - 65, - 157, - 111, - 52, - 84, - 126, - 107, - 117, # lreal - 65, # char 'A' - 3, - 169, # wchar - 0, - 4, - 0, - 4, - 3, - 169, - 0, - ord("s"), - 0, - ord("t"), - 0, - 196, # wstring - 45, - 235, # date - 2, - 179, - 41, - 128, # tod - 7, - 230, - 3, - 9, - 4, - 12, - 34, - 45, - 0, - 0, - 0, - 0, # dtl - 116, - 101, - 115, - 116, - 32, - 32, - 32, - 32, # fstring 'test ' - ] -) - - -class TestPrintRow: - def test_print_row_output(self, caplog: pytest.LogCaptureFixture) -> None: - data = bytearray([65, 66, 67, 68, 69]) - with caplog.at_level(logging.INFO, logger="snap7.util.db"): - print_row(data) - assert "65" in caplog.text - assert "A" in caplog.text - - -class TestDBDictInterface: - def setup_method(self) -> None: - test_array = bytearray(_bytearray * 3) - self.db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=3, layout_offset=4, db_offset=0) - - def test_len(self) -> None: - assert len(self.db) == 3 - - def test_getitem(self) -> None: - row = self.db["0"] - assert row is not None - - def test_getitem_missing(self) -> None: - row = self.db["999"] - assert row is None - - def test_contains(self) -> None: - assert "0" in self.db - assert "999" not in self.db - - def test_keys(self) -> None: - keys = list(self.db.keys()) - assert "0" in keys - assert len(keys) == 3 - - def test_items(self) -> None: - items = list(self.db.items()) - assert len(items) == 3 - for key, row in items: - assert isinstance(key, str) - assert isinstance(row, Row) - - def test_iter(self) -> None: - for key, row in self.db: - assert isinstance(key, str) - assert isinstance(row, Row) - - def test_get_bytearray(self) -> None: - ba = self.db.get_bytearray() - assert isinstance(ba, bytearray) - - -class TestDBWithIdField: - def test_id_field_creates_named_index(self) -> None: - test_array = bytearray(_bytearray * 2) - # Set different ID values for each row - struct.pack_into(">h", test_array, 0, 10) # row 0, ID at offset 0 (spec offset 4, layout_offset 4) - struct.pack_into(">h", test_array, len(_bytearray), 20) # row 1 - db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=2, id_field="ID", layout_offset=4, db_offset=0) - assert "10" in db - assert "20" in db - - -class TestDBSetData: - def test_set_data_valid(self) -> None: - test_array = bytearray(_bytearray) - db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0) - new_data = bytearray(len(_bytearray)) - db.set_data(new_data) - assert db.get_bytearray() is new_data - - def test_set_data_invalid_type(self) -> None: - test_array = bytearray(_bytearray) - db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0) - with pytest.raises(TypeError): - db.set_data(b"not a bytearray") # type: ignore[arg-type] - - -class TestDBReadWrite: - """Test DB.read() and DB.write() with mocked client.""" - - def test_read_db_area(self) -> None: - test_array = bytearray(_bytearray) - db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0) - mock_client = MagicMock() - mock_client.db_read.return_value = bytearray(len(_bytearray)) - db.read(mock_client) - mock_client.db_read.assert_called_once() - - def test_read_non_db_area(self) -> None: - test_array = bytearray(_bytearray) - db = DB(0, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0, area=Area.MK) - mock_client = MagicMock() - mock_client.read_area.return_value = bytearray(len(_bytearray)) - db.read(mock_client) - mock_client.read_area.assert_called_once() - - def test_read_negative_row_size(self) -> None: - test_array = bytearray(_bytearray) - db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0) - db.row_size = -1 - mock_client = MagicMock() - with pytest.raises(ValueError, match="row_size"): - db.read(mock_client) - - def test_write_db_area(self) -> None: - test_array = bytearray(_bytearray) - db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0) - mock_client = MagicMock() - db.write(mock_client) - mock_client.db_write.assert_called_once() - - def test_write_non_db_area(self) -> None: - test_array = bytearray(_bytearray) - db = DB(0, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0, area=Area.MK) - mock_client = MagicMock() - db.write(mock_client) - mock_client.write_area.assert_called_once() - - def test_write_negative_row_size(self) -> None: - test_array = bytearray(_bytearray) - db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0) - db.row_size = -1 - mock_client = MagicMock() - with pytest.raises(ValueError, match="row_size"): - db.write(mock_client) - - def test_write_with_row_offset(self) -> None: - test_array = bytearray(_bytearray * 2) - db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=2, layout_offset=4, db_offset=0, row_offset=4) - mock_client = MagicMock() - db.write(mock_client) - # Should write each row individually via Row.write() - assert mock_client.db_write.call_count == 2 - - -class TestRowRepr: - def test_repr(self) -> None: - test_array = bytearray(_bytearray) - row = Row(test_array, test_spec, layout_offset=4) - r = repr(row) - assert "ID" in r - assert "NAME" in r - - -class TestRowUnchanged: - def test_unchanged_true(self) -> None: - test_array = bytearray(_bytearray) - row = Row(test_array, test_spec, layout_offset=4) - assert row.unchanged(test_array) is True - - def test_unchanged_false(self) -> None: - test_array = bytearray(_bytearray) - row = Row(test_array, test_spec, layout_offset=4) - other = bytearray(len(_bytearray)) - assert row.unchanged(other) is False - - -class TestRowTypeError: - def test_invalid_bytearray_type(self) -> None: - with pytest.raises(TypeError): - Row("not a bytearray", test_spec) # type: ignore[arg-type] - - -class TestRowReadWrite: - """Test Row.read() and Row.write() with mocked client through DB parent.""" - - def test_row_write_db_area(self) -> None: - test_array = bytearray(_bytearray) - db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0) - row = db["0"] - assert row is not None - mock_client = MagicMock() - row.write(mock_client) - mock_client.db_write.assert_called_once() - - def test_row_write_non_db_area(self) -> None: - test_array = bytearray(_bytearray) - db = DB(0, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0, area=Area.MK) - row = db["0"] - assert row is not None - mock_client = MagicMock() - row.write(mock_client) - mock_client.write_area.assert_called_once() - - def test_row_write_not_db_parent(self) -> None: - test_array = bytearray(_bytearray) - row = Row(test_array, test_spec, layout_offset=4) - mock_client = MagicMock() - with pytest.raises(TypeError): - row.write(mock_client) - - def test_row_write_negative_row_size(self) -> None: - test_array = bytearray(_bytearray) - db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0) - row = db["0"] - assert row is not None - row.row_size = -1 - mock_client = MagicMock() - with pytest.raises(ValueError, match="row_size"): - row.write(mock_client) - - def test_row_read_db_area(self) -> None: - test_array = bytearray(_bytearray) - db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0) - row = db["0"] - assert row is not None - mock_client = MagicMock() - mock_client.db_read.return_value = bytearray(len(_bytearray)) - row.read(mock_client) - mock_client.db_read.assert_called_once() - - def test_row_read_non_db_area(self) -> None: - test_array = bytearray(_bytearray) - db = DB(0, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0, area=Area.MK) - row = db["0"] - assert row is not None - mock_client = MagicMock() - mock_client.read_area.return_value = bytearray(len(_bytearray)) - row.read(mock_client) - mock_client.read_area.assert_called_once() - - def test_row_read_not_db_parent(self) -> None: - test_array = bytearray(_bytearray) - row = Row(test_array, test_spec, layout_offset=4) - mock_client = MagicMock() - with pytest.raises(TypeError): - row.read(mock_client) - - def test_row_read_negative_row_size(self) -> None: - test_array = bytearray(_bytearray) - db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0) - row = db["0"] - assert row is not None - row.row_size = -1 - mock_client = MagicMock() - with pytest.raises(ValueError, match="row_size"): - row.read(mock_client) - - -class TestRowSetValueTypes: - """Test set_value for various type branches.""" - - def setup_method(self) -> None: - self.test_array = bytearray(_bytearray) - self.row = Row(self.test_array, test_spec, layout_offset=4) - - def test_set_int(self) -> None: - self.row.set_value(4, "INT", 42) - assert self.row.get_value(4, "INT") == 42 - - def test_set_uint(self) -> None: - self.row.set_value(51, "UINT", 1000) - assert self.row.get_value(51, "UINT") == 1000 - - def test_set_dint(self) -> None: - self.row.set_value(23, "DINT", -100) - assert self.row.get_value(23, "DINT") == -100 - - def test_set_udint(self) -> None: - self.row.set_value(53, "UDINT", 999999) - assert self.row.get_value(53, "UDINT") == 999999 - - def test_set_word(self) -> None: - self.row.set_value(27, "WORD", 12345) - assert self.row.get_value(27, "WORD") == 12345 - - def test_set_usint(self) -> None: - self.row.set_value(43, "USINT", 200) - assert self.row.get_value(43, "USINT") == 200 - - def test_set_sint(self) -> None: - self.row.set_value(44, "SINT", -50) - assert self.row.get_value(44, "SINT") == -50 - - def test_set_time(self) -> None: - self.row.set_value(46, "TIME", "1:2:3:4.5") - assert self.row.get_value(46, "TIME") is not None - - def test_set_date(self) -> None: - d = datetime.date(2024, 1, 15) - self.row.set_value(80, "DATE", d) - assert self.row.get_value(80, "DATE") == d - - def test_set_tod(self) -> None: - td = datetime.timedelta(hours=5, minutes=30) - self.row.set_value(82, "TOD", td) - assert self.row.get_value(82, "TOD") == td - - def test_set_time_of_day(self) -> None: - td = datetime.timedelta(hours=1) - self.row.set_value(82, "TIME_OF_DAY", td) - assert self.row.get_value(82, "TIME_OF_DAY") == td - - def test_set_dtl(self) -> None: - dt = datetime.datetime(2024, 6, 15, 10, 20, 30) - self.row.set_value(86, "DTL", dt) - result = self.row.get_value(86, "DTL") - assert result.year == 2024 # type: ignore[union-attr] - - def test_set_date_and_time(self) -> None: - dt = datetime.datetime(2020, 7, 12, 17, 32, 2, 854000) - self.row.set_value(31, "DATE_AND_TIME", dt) - result = self.row.get_value(31, "DATE_AND_TIME") - assert "2020" in str(result) - - def test_set_unknown_type_raises(self) -> None: - with pytest.raises(ValueError): - self.row.set_value(4, "UNKNOWN_TYPE", 42) - - def test_set_string(self) -> None: - self.row.set_value(6, "STRING[4]", "ab") - assert self.row.get_value(6, "STRING[4]") == "ab" - - def test_set_wstring(self) -> None: - self.row.set_value(68, "WSTRING[4]", "ab") - assert self.row.get_value(68, "WSTRING[4]") == "ab" - - def test_set_fstring(self) -> None: - self.row.set_value(98, "FSTRING[8]", "hi") - assert self.row.get_value(98, "FSTRING[8]") == "hi" - - def test_set_real(self) -> None: - self.row.set_value(13, "REAL", 3.14) - assert abs(self.row.get_value(13, "REAL") - 3.14) < 0.01 # type: ignore[operator] - - def test_set_lreal(self) -> None: - self.row.set_value(57, "LREAL", 2.718281828) - assert abs(self.row.get_value(57, "LREAL") - 2.718281828) < 0.0001 # type: ignore[operator] - - def test_set_char(self) -> None: - self.row.set_value(65, "CHAR", "Z") - assert self.row.get_value(65, "CHAR") == "Z" - - def test_set_wchar(self) -> None: - self.row.set_value(66, "WCHAR", "W") - assert self.row.get_value(66, "WCHAR") == "W" - - -class TestRowGetValueEdgeCases: - """Test get_value for edge cases.""" - - def setup_method(self) -> None: - self.test_array = bytearray(_bytearray) - self.row = Row(self.test_array, test_spec, layout_offset=4) - - def test_unknown_type_raises(self) -> None: - with pytest.raises(ValueError): - self.row.get_value(4, "NONEXISTENT") - - def test_string_no_max_size(self) -> None: - spec = "4 test STRING" - row = Row(bytearray(20), spec, layout_offset=0) - with pytest.raises(ValueError, match="Max size"): - row.get_value(4, "STRING") - - def test_fstring_no_max_size(self) -> None: - with pytest.raises(ValueError, match="Max size"): - self.row.get_value(98, "FSTRING") - - def test_wstring_no_max_size(self) -> None: - with pytest.raises(ValueError, match="Max size"): - self.row.get_value(68, "WSTRING") - - -class TestRowSetValueEdgeCases: - """Test set_value edge cases for string types.""" - - def setup_method(self) -> None: - self.test_array = bytearray(_bytearray) - self.row = Row(self.test_array, test_spec, layout_offset=4) - - def test_fstring_no_max_size(self) -> None: - with pytest.raises(ValueError, match="Max size"): - self.row.set_value(98, "FSTRING", "test") - - def test_string_no_max_size(self) -> None: - with pytest.raises(ValueError, match="Max size"): - self.row.set_value(6, "STRING", "test") - - def test_wstring_no_max_size(self) -> None: - with pytest.raises(ValueError, match="Max size"): - self.row.set_value(68, "WSTRING", "test") - - -class TestRowWriteWithRowOffset: - """Test Row.write() with row_offset set.""" - - def test_write_with_row_offset(self) -> None: - test_array = bytearray(_bytearray) - db = DB(1, test_array, test_spec, row_size=len(_bytearray), size=1, layout_offset=4, db_offset=0, row_offset=10) - row = db["0"] - assert row is not None - mock_client = MagicMock() - row.write(mock_client) - # The data written should start at db_offset + row_offset - mock_client.db_write.assert_called_once() diff --git a/tests/test_logo_client.py b/tests/test_logo_client.py index 58bf5d5c..a5d48a6f 100644 --- a/tests/test_logo_client.py +++ b/tests/test_logo_client.py @@ -4,8 +4,9 @@ from typing import Optional import snap7 +from snap7.logo import Logo, parse_address from snap7.server import Server -from snap7.type import Parameter, SrvArea +from snap7.type import Parameter, SrvArea, WordLen logging.basicConfig(level=logging.WARNING) @@ -124,5 +125,247 @@ def test_set_param(self) -> None: self.client.set_param(param, value) +logo_coverage_tcpport = 11102 + + +# --------------------------------------------------------------------------- +# parse_address() unit tests (no server needed) +# --------------------------------------------------------------------------- + + +@pytest.mark.logo +class TestParseAddress(unittest.TestCase): + """Test every branch of parse_address().""" + + def test_byte_address(self) -> None: + start, wl = parse_address("V10") + self.assertEqual(start, 10) + self.assertEqual(wl, WordLen.Byte) + + def test_byte_address_large(self) -> None: + start, wl = parse_address("V999") + self.assertEqual(start, 999) + self.assertEqual(wl, WordLen.Byte) + + def test_word_address(self) -> None: + start, wl = parse_address("VW20") + self.assertEqual(start, 20) + self.assertEqual(wl, WordLen.Word) + + def test_word_address_zero(self) -> None: + start, wl = parse_address("VW0") + self.assertEqual(start, 0) + self.assertEqual(wl, WordLen.Word) + + def test_dword_address(self) -> None: + start, wl = parse_address("VD30") + self.assertEqual(start, 30) + self.assertEqual(wl, WordLen.DWord) + + def test_bit_address(self) -> None: + start, wl = parse_address("V10.3") + # bit offset = 10*8 + 3 = 83 + self.assertEqual(start, 83) + self.assertEqual(wl, WordLen.Bit) + + def test_bit_address_zero(self) -> None: + start, wl = parse_address("V0.0") + self.assertEqual(start, 0) + self.assertEqual(wl, WordLen.Bit) + + def test_bit_address_high_bit(self) -> None: + start, wl = parse_address("V0.7") + self.assertEqual(start, 7) + self.assertEqual(wl, WordLen.Bit) + + def test_invalid_address_raises(self) -> None: + with self.assertRaises(ValueError): + parse_address("INVALID") + + def test_invalid_address_empty(self) -> None: + with self.assertRaises(ValueError): + parse_address("") + + def test_invalid_address_wrong_prefix(self) -> None: + with self.assertRaises(ValueError): + parse_address("M10") + + +# --------------------------------------------------------------------------- +# Integration tests: Logo client against the built-in Server +# --------------------------------------------------------------------------- + + +@pytest.mark.logo +class TestLogoReadWrite(unittest.TestCase): + """Test Logo read/write against a real server with DB1 registered.""" + + server: Optional[Server] = None + db_data: bytearray + + @classmethod + def setUpClass(cls) -> None: + cls.db_data = bytearray(256) + cls.server = Server() + cls.server.register_area(SrvArea.DB, 0, bytearray(256)) + cls.server.register_area(SrvArea.DB, 1, cls.db_data) + cls.server.start(tcp_port=logo_coverage_tcpport) + + @classmethod + def tearDownClass(cls) -> None: + if cls.server: + cls.server.stop() + cls.server.destroy() + + def setUp(self) -> None: + self.client = Logo() + self.client.connect(ip, 0x1000, 0x2000, logo_coverage_tcpport) + + def tearDown(self) -> None: + self.client.disconnect() + self.client.destroy() + + # -- read tests --------------------------------------------------------- + + def test_read_byte(self) -> None: + """Write a known byte into DB1 via client, then read it back.""" + self.client.write("V5", 0xAB) + result = self.client.read("V5") + self.assertEqual(result, 0xAB) + + def test_read_word(self) -> None: + """Write and read back a word (signed 16-bit big-endian).""" + self.client.write("VW10", 1234) + result = self.client.read("VW10") + self.assertEqual(result, 1234) + + def test_read_word_negative(self) -> None: + """Words are signed — negative values should round-trip.""" + self.client.write("VW12", -500) + result = self.client.read("VW12") + self.assertEqual(result, -500) + + def test_read_dword(self) -> None: + """Write and read back a dword (signed 32-bit big-endian).""" + self.client.write("VD20", 70000) + result = self.client.read("VD20") + self.assertEqual(result, 70000) + + def test_read_dword_negative(self) -> None: + """DWords are signed — negative values should round-trip.""" + self.client.write("VD24", -123456) + result = self.client.read("VD24") + self.assertEqual(result, -123456) + + def test_read_bit_set(self) -> None: + """Write bit=1, then read it back.""" + self.client.write("V50.2", 1) + result = self.client.read("V50.2") + self.assertEqual(result, 1) + + def test_read_bit_clear(self) -> None: + """Write bit=0, then read it back.""" + # First set it so we know we're actually clearing + self.client.write("V51.5", 1) + self.assertEqual(self.client.read("V51.5"), 1) + self.client.write("V51.5", 0) + result = self.client.read("V51.5") + self.assertEqual(result, 0) + + def test_read_bit_zero(self) -> None: + """Read bit 0 of byte 0.""" + self.client.write("V60", 0) # clear byte first + self.client.write("V60.0", 1) + self.assertEqual(self.client.read("V60.0"), 1) + # Other bits should be 0 + self.assertEqual(self.client.read("V60.1"), 0) + + def test_read_bit_seven(self) -> None: + """Read bit 7 of a byte.""" + self.client.write("V61", 0) # clear byte + self.client.write("V61.7", 1) + self.assertEqual(self.client.read("V61.7"), 1) + # Byte should be 0x80 + self.assertEqual(self.client.read("V61"), 0x80) + + # -- write tests -------------------------------------------------------- + + def test_write_byte(self) -> None: + """Write a byte and verify.""" + result = self.client.write("V70", 42) + self.assertEqual(result, 0) + self.assertEqual(self.client.read("V70"), 42) + + def test_write_word(self) -> None: + """Write a word and verify.""" + result = self.client.write("VW80", 2000) + self.assertEqual(result, 0) + self.assertEqual(self.client.read("VW80"), 2000) + + def test_write_dword(self) -> None: + """Write a dword and verify.""" + result = self.client.write("VD90", 100000) + self.assertEqual(result, 0) + self.assertEqual(self.client.read("VD90"), 100000) + + def test_write_bit_true(self) -> None: + """Write a bit to True.""" + result = self.client.write("V100.4", 1) + self.assertEqual(result, 0) + self.assertEqual(self.client.read("V100.4"), 1) + + def test_write_bit_false(self) -> None: + """Write a bit to False after setting it.""" + self.client.write("V101.6", 1) + result = self.client.write("V101.6", 0) + self.assertEqual(result, 0) + self.assertEqual(self.client.read("V101.6"), 0) + + def test_write_bit_preserves_other_bits(self) -> None: + """Setting one bit should not disturb other bits in the same byte.""" + # Write 0xFF to the byte + self.client.write("V110", 0xFF) + # Clear bit 3 + self.client.write("V110.3", 0) + # Byte should now be 0xF7 (all bits set except bit 3) + self.assertEqual(self.client.read("V110"), 0xF7) + # Set bit 3 back + self.client.write("V110.3", 1) + self.assertEqual(self.client.read("V110"), 0xFF) + + def test_write_byte_boundary_values(self) -> None: + """Test boundary values: 0 and 255.""" + self.client.write("V120", 0) + self.assertEqual(self.client.read("V120"), 0) + self.client.write("V120", 255) + self.assertEqual(self.client.read("V120"), 255) + + def test_write_word_boundary_values(self) -> None: + """Test word boundary values: max positive and max negative.""" + self.client.write("VW130", 32767) + self.assertEqual(self.client.read("VW130"), 32767) + self.client.write("VW130", -32768) + self.assertEqual(self.client.read("VW130"), -32768) + + def test_write_dword_boundary_values(self) -> None: + """Test dword boundary values.""" + self.client.write("VD140", 2147483647) + self.assertEqual(self.client.read("VD140"), 2147483647) + self.client.write("VD140", -2147483648) + self.assertEqual(self.client.read("VD140"), -2147483648) + + def test_read_write_multiple_addresses(self) -> None: + """Verify different address types can coexist.""" + self.client.write("V200", 0x42) + self.client.write("VW202", 1000) + self.client.write("VD204", 50000) + self.client.write("V208.1", 1) + + self.assertEqual(self.client.read("V200"), 0x42) + self.assertEqual(self.client.read("VW202"), 1000) + self.assertEqual(self.client.read("VD204"), 50000) + self.assertEqual(self.client.read("V208.1"), 1) + + if __name__ == "__main__": unittest.main() diff --git a/tests/test_logo_coverage.py b/tests/test_logo_coverage.py deleted file mode 100644 index 8437d585..00000000 --- a/tests/test_logo_coverage.py +++ /dev/null @@ -1,260 +0,0 @@ -"""Tests for snap7/logo.py to improve coverage of parse_address, read, and write.""" - -import logging -import unittest -from typing import Optional - -import pytest - -from snap7.logo import Logo, parse_address -from snap7.server import Server -from snap7.type import SrvArea, WordLen - -logging.basicConfig(level=logging.WARNING) - -ip = "127.0.0.1" -tcpport = 11102 -db_number = 1 - - -# --------------------------------------------------------------------------- -# parse_address() unit tests (no server needed) -# --------------------------------------------------------------------------- - - -@pytest.mark.logo -class TestParseAddress(unittest.TestCase): - """Test every branch of parse_address().""" - - def test_byte_address(self) -> None: - start, wl = parse_address("V10") - self.assertEqual(start, 10) - self.assertEqual(wl, WordLen.Byte) - - def test_byte_address_large(self) -> None: - start, wl = parse_address("V999") - self.assertEqual(start, 999) - self.assertEqual(wl, WordLen.Byte) - - def test_word_address(self) -> None: - start, wl = parse_address("VW20") - self.assertEqual(start, 20) - self.assertEqual(wl, WordLen.Word) - - def test_word_address_zero(self) -> None: - start, wl = parse_address("VW0") - self.assertEqual(start, 0) - self.assertEqual(wl, WordLen.Word) - - def test_dword_address(self) -> None: - start, wl = parse_address("VD30") - self.assertEqual(start, 30) - self.assertEqual(wl, WordLen.DWord) - - def test_bit_address(self) -> None: - start, wl = parse_address("V10.3") - # bit offset = 10*8 + 3 = 83 - self.assertEqual(start, 83) - self.assertEqual(wl, WordLen.Bit) - - def test_bit_address_zero(self) -> None: - start, wl = parse_address("V0.0") - self.assertEqual(start, 0) - self.assertEqual(wl, WordLen.Bit) - - def test_bit_address_high_bit(self) -> None: - start, wl = parse_address("V0.7") - self.assertEqual(start, 7) - self.assertEqual(wl, WordLen.Bit) - - def test_invalid_address_raises(self) -> None: - with self.assertRaises(ValueError): - parse_address("INVALID") - - def test_invalid_address_empty(self) -> None: - with self.assertRaises(ValueError): - parse_address("") - - def test_invalid_address_wrong_prefix(self) -> None: - with self.assertRaises(ValueError): - parse_address("M10") - - -# --------------------------------------------------------------------------- -# Integration tests: Logo client against the built-in Server -# --------------------------------------------------------------------------- - - -@pytest.mark.logo -class TestLogoReadWrite(unittest.TestCase): - """Test Logo read/write against a real server with DB1 registered.""" - - server: Optional[Server] = None - db_data: bytearray - - @classmethod - def setUpClass(cls) -> None: - cls.db_data = bytearray(256) - cls.server = Server() - cls.server.register_area(SrvArea.DB, 0, bytearray(256)) - cls.server.register_area(SrvArea.DB, 1, cls.db_data) - cls.server.start(tcp_port=tcpport) - - @classmethod - def tearDownClass(cls) -> None: - if cls.server: - cls.server.stop() - cls.server.destroy() - - def setUp(self) -> None: - self.client = Logo() - self.client.connect(ip, 0x1000, 0x2000, tcpport) - - def tearDown(self) -> None: - self.client.disconnect() - self.client.destroy() - - # -- read tests --------------------------------------------------------- - - def test_read_byte(self) -> None: - """Write a known byte into DB1 via client, then read it back.""" - self.client.write("V5", 0xAB) - result = self.client.read("V5") - self.assertEqual(result, 0xAB) - - def test_read_word(self) -> None: - """Write and read back a word (signed 16-bit big-endian).""" - self.client.write("VW10", 1234) - result = self.client.read("VW10") - self.assertEqual(result, 1234) - - def test_read_word_negative(self) -> None: - """Words are signed — negative values should round-trip.""" - self.client.write("VW12", -500) - result = self.client.read("VW12") - self.assertEqual(result, -500) - - def test_read_dword(self) -> None: - """Write and read back a dword (signed 32-bit big-endian).""" - self.client.write("VD20", 70000) - result = self.client.read("VD20") - self.assertEqual(result, 70000) - - def test_read_dword_negative(self) -> None: - """DWords are signed — negative values should round-trip.""" - self.client.write("VD24", -123456) - result = self.client.read("VD24") - self.assertEqual(result, -123456) - - def test_read_bit_set(self) -> None: - """Write bit=1, then read it back.""" - self.client.write("V50.2", 1) - result = self.client.read("V50.2") - self.assertEqual(result, 1) - - def test_read_bit_clear(self) -> None: - """Write bit=0, then read it back.""" - # First set it so we know we're actually clearing - self.client.write("V51.5", 1) - self.assertEqual(self.client.read("V51.5"), 1) - self.client.write("V51.5", 0) - result = self.client.read("V51.5") - self.assertEqual(result, 0) - - def test_read_bit_zero(self) -> None: - """Read bit 0 of byte 0.""" - self.client.write("V60", 0) # clear byte first - self.client.write("V60.0", 1) - self.assertEqual(self.client.read("V60.0"), 1) - # Other bits should be 0 - self.assertEqual(self.client.read("V60.1"), 0) - - def test_read_bit_seven(self) -> None: - """Read bit 7 of a byte.""" - self.client.write("V61", 0) # clear byte - self.client.write("V61.7", 1) - self.assertEqual(self.client.read("V61.7"), 1) - # Byte should be 0x80 - self.assertEqual(self.client.read("V61"), 0x80) - - # -- write tests -------------------------------------------------------- - - def test_write_byte(self) -> None: - """Write a byte and verify.""" - result = self.client.write("V70", 42) - self.assertEqual(result, 0) - self.assertEqual(self.client.read("V70"), 42) - - def test_write_word(self) -> None: - """Write a word and verify.""" - result = self.client.write("VW80", 2000) - self.assertEqual(result, 0) - self.assertEqual(self.client.read("VW80"), 2000) - - def test_write_dword(self) -> None: - """Write a dword and verify.""" - result = self.client.write("VD90", 100000) - self.assertEqual(result, 0) - self.assertEqual(self.client.read("VD90"), 100000) - - def test_write_bit_true(self) -> None: - """Write a bit to True.""" - result = self.client.write("V100.4", 1) - self.assertEqual(result, 0) - self.assertEqual(self.client.read("V100.4"), 1) - - def test_write_bit_false(self) -> None: - """Write a bit to False after setting it.""" - self.client.write("V101.6", 1) - result = self.client.write("V101.6", 0) - self.assertEqual(result, 0) - self.assertEqual(self.client.read("V101.6"), 0) - - def test_write_bit_preserves_other_bits(self) -> None: - """Setting one bit should not disturb other bits in the same byte.""" - # Write 0xFF to the byte - self.client.write("V110", 0xFF) - # Clear bit 3 - self.client.write("V110.3", 0) - # Byte should now be 0xF7 (all bits set except bit 3) - self.assertEqual(self.client.read("V110"), 0xF7) - # Set bit 3 back - self.client.write("V110.3", 1) - self.assertEqual(self.client.read("V110"), 0xFF) - - def test_write_byte_boundary_values(self) -> None: - """Test boundary values: 0 and 255.""" - self.client.write("V120", 0) - self.assertEqual(self.client.read("V120"), 0) - self.client.write("V120", 255) - self.assertEqual(self.client.read("V120"), 255) - - def test_write_word_boundary_values(self) -> None: - """Test word boundary values: max positive and max negative.""" - self.client.write("VW130", 32767) - self.assertEqual(self.client.read("VW130"), 32767) - self.client.write("VW130", -32768) - self.assertEqual(self.client.read("VW130"), -32768) - - def test_write_dword_boundary_values(self) -> None: - """Test dword boundary values.""" - self.client.write("VD140", 2147483647) - self.assertEqual(self.client.read("VD140"), 2147483647) - self.client.write("VD140", -2147483648) - self.assertEqual(self.client.read("VD140"), -2147483648) - - def test_read_write_multiple_addresses(self) -> None: - """Verify different address types can coexist.""" - self.client.write("V200", 0x42) - self.client.write("VW202", 1000) - self.client.write("VD204", 50000) - self.client.write("V208.1", 1) - - self.assertEqual(self.client.read("V200"), 0x42) - self.assertEqual(self.client.read("VW202"), 1000) - self.assertEqual(self.client.read("VD204"), 50000) - self.assertEqual(self.client.read("V208.1"), 1) - - -if __name__ == "__main__": - unittest.main() diff --git a/tests/test_partner.py b/tests/test_partner.py index 34c9cb27..570fbca9 100644 --- a/tests/test_partner.py +++ b/tests/test_partner.py @@ -1,10 +1,16 @@ import logging +import socket +import struct +import threading +import time import pytest import unittest as unittest -from snap7.error import error_text +from snap7.connection import ISOTCPConnection +from snap7.error import error_text, S7Error, S7ConnectionError import snap7.partner +from snap7.partner import Partner, PartnerStatus from snap7.type import Parameter logging.basicConfig(level=logging.WARNING) @@ -116,5 +122,614 @@ def test_wait_as_b_send_completion(self) -> None: self.assertRaises(RuntimeError, self.partner.wait_as_b_send_completion) +def _free_port() -> int: + """Return a free TCP port chosen by the OS.""" + with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s: + s.bind(("127.0.0.1", 0)) + port: int = s.getsockname()[1] + return port + + +# --------------------------------------------------------------------------- +# PDU building / parsing unit tests (no network required) +# --------------------------------------------------------------------------- + + +@pytest.mark.partner +class TestPartnerPDU: + """Unit tests for partner PDU building and parsing.""" + + def test_build_partner_data_pdu_small(self) -> None: + p = Partner() + data = b"\x01\x02\x03" + pdu = p._build_partner_data_pdu(data) + assert pdu[0:1] == b"\x32" + assert pdu[1:2] == b"\x07" + assert struct.unpack(">H", pdu[2:4])[0] == len(data) + assert pdu[6:] == data + + def test_build_partner_data_pdu_empty(self) -> None: + p = Partner() + pdu = p._build_partner_data_pdu(b"") + assert pdu[0:1] == b"\x32" + assert struct.unpack(">H", pdu[2:4])[0] == 0 + + def test_build_partner_data_pdu_large(self) -> None: + p = Partner() + data = bytes(range(256)) * 4 # 1024 bytes + pdu = p._build_partner_data_pdu(data) + assert struct.unpack(">H", pdu[2:4])[0] == 1024 + assert pdu[6:] == data + + def test_parse_partner_data_pdu_roundtrip(self) -> None: + p = Partner() + original = b"Hello, Partner!" + pdu = p._build_partner_data_pdu(original) + parsed = p._parse_partner_data_pdu(pdu) + assert parsed == original + + def test_parse_partner_data_pdu_roundtrip_various_sizes(self) -> None: + p = Partner() + for size in [0, 1, 10, 100, 500, 1024]: + data = (bytes(range(256)) * (size // 256 + 1))[:size] + pdu = p._build_partner_data_pdu(data) + assert p._parse_partner_data_pdu(pdu) == data + + def test_parse_partner_data_pdu_too_short(self) -> None: + p = Partner() + with pytest.raises(S7Error, match="too short"): + p._parse_partner_data_pdu(b"\x32\x07\x00") + + def test_build_partner_ack(self) -> None: + p = Partner() + ack = p._build_partner_ack() + assert len(ack) == 6 + assert ack[0:1] == b"\x32" + assert ack[1:2] == b"\x08" + + def test_parse_partner_ack_valid(self) -> None: + p = Partner() + ack = p._build_partner_ack() + p._parse_partner_ack(ack) + + def test_parse_partner_ack_too_short(self) -> None: + p = Partner() + with pytest.raises(S7Error, match="too short"): + p._parse_partner_ack(b"\x32") + + def test_parse_partner_ack_wrong_type(self) -> None: + p = Partner() + bad_ack = struct.pack(">BBHH", 0x32, 0x07, 0x0000, 0x0000) + with pytest.raises(S7Error, match="Expected partner ACK"): + p._parse_partner_ack(bad_ack) + + def test_ack_roundtrip(self) -> None: + p = Partner() + ack = p._build_partner_ack() + p._parse_partner_ack(ack) + + +# --------------------------------------------------------------------------- +# Status, stats, lifecycle tests +# --------------------------------------------------------------------------- + + +@pytest.mark.partner +class TestPartnerLifecycle: + """Tests for partner lifecycle, status, and context manager.""" + + def test_initial_status_stopped(self) -> None: + p = Partner() + assert p.get_status().value == PartnerStatus.STOPPED + + def test_status_running_passive(self) -> None: + port = _free_port() + p = Partner(active=False) + p.port = port + try: + p.start_to("127.0.0.1", "", 0x0100, 0x0102) + assert p.running is True + assert p.get_status().value == PartnerStatus.RUNNING + finally: + p.stop() + + def test_stop_idempotent(self) -> None: + p = Partner() + p.stop() + p.stop() + + def test_destroy_returns_zero(self) -> None: + p = Partner() + assert p.destroy() == 0 + + def test_context_manager(self) -> None: + port = _free_port() + with Partner(active=False) as p: + p.port = port + p.start_to("127.0.0.1", "", 0x0100, 0x0102) + assert p.running is True + assert p.running is False + + def test_del_cleanup(self) -> None: + port = _free_port() + p = Partner(active=False) + p.port = port + p.start_to("127.0.0.1", "", 0x0100, 0x0102) + assert p.running is True + p.__del__() + assert p.running is False + + def test_create_noop(self) -> None: + p = Partner() + p.create(active=True) + + def test_get_stats_initial(self) -> None: + p = Partner() + sent, recv, s_err, r_err = p.get_stats() + assert sent.value == 0 + assert recv.value == 0 + assert s_err.value == 0 + assert r_err.value == 0 + + def test_get_times_initial(self) -> None: + p = Partner() + send_t, recv_t = p.get_times() + assert send_t.value == 0 + assert recv_t.value == 0 + + def test_get_last_error_initial(self) -> None: + p = Partner() + assert p.get_last_error().value == 0 + + +# --------------------------------------------------------------------------- +# Send / recv data buffer tests +# --------------------------------------------------------------------------- + + +@pytest.mark.partner +class TestPartnerSendRecvBuffers: + """Tests for set_send_data / get_recv_data and error paths.""" + + def test_set_send_data_and_retrieve(self) -> None: + p = Partner() + assert p._send_data is None + p.set_send_data(b"test") + assert p._send_data == b"test" + + def test_get_recv_data_initially_none(self) -> None: + p = Partner() + assert p.get_recv_data() is None + + def test_b_send_no_data(self) -> None: + p = Partner() + assert p.b_send() == -1 + + def test_b_send_not_connected(self) -> None: + p = Partner() + p.set_send_data(b"data") + with pytest.raises(S7ConnectionError, match="Not connected"): + p.b_send() + + def test_b_recv_not_connected(self) -> None: + p = Partner() + result = p.b_recv() + assert result == -1 + assert p.get_recv_data() is None + + def test_as_b_send_no_data(self) -> None: + p = Partner() + assert p.as_b_send() == -1 + + def test_as_b_send_not_connected(self) -> None: + p = Partner() + p.set_send_data(b"data") + result = p.as_b_send() + assert result == -1 + + def test_check_as_b_recv_completion_empty(self) -> None: + p = Partner() + assert p.check_as_b_recv_completion() == 1 + + def test_check_as_b_recv_completion_with_data(self) -> None: + p = Partner() + p._async_recv_queue.put(b"queued data") + assert p.check_as_b_recv_completion() == 0 + assert p._recv_data == b"queued data" + + def test_check_as_b_send_completion_not_in_progress(self) -> None: + p = Partner() + status, result = p.check_as_b_send_completion() + assert status == "job complete" + + def test_check_as_b_send_completion_in_progress(self) -> None: + p = Partner() + p._async_send_in_progress = True + status, result = p.check_as_b_send_completion() + assert status == "job in progress" + + def test_wait_as_b_send_no_operation(self) -> None: + p = Partner() + with pytest.raises(RuntimeError, match="No async send"): + p.wait_as_b_send_completion() + + def test_wait_as_b_send_timeout(self) -> None: + p = Partner() + p._async_send_in_progress = True + result = p.wait_as_b_send_completion(timeout=50) + assert result == -1 + + def test_wait_as_b_send_completes(self) -> None: + p = Partner() + p._async_send_in_progress = True + p._async_send_result = 0 + + def clear_flag() -> None: + time.sleep(0.05) + p._async_send_in_progress = False + + t = threading.Thread(target=clear_flag) + t.start() + result = p.wait_as_b_send_completion(timeout=2000) + t.join() + assert result == 0 + + +# --------------------------------------------------------------------------- +# Parameter tests +# --------------------------------------------------------------------------- + + +@pytest.mark.partner +class TestPartnerParams: + """Tests for get_param / set_param.""" + + def test_get_param_unsupported(self) -> None: + p = Partner() + with pytest.raises(RuntimeError, match="not supported"): + p.get_param(Parameter.MaxClients) + + def test_set_param_remote_port_raises(self) -> None: + p = Partner() + with pytest.raises(RuntimeError, match="Cannot set"): + p.set_param(Parameter.RemotePort, 1234) + + def test_set_param_local_port(self) -> None: + p = Partner() + p.set_param(Parameter.LocalPort, 5555) + assert p.local_port == 5555 + + def test_set_param_returns_zero(self) -> None: + p = Partner() + assert p.set_param(Parameter.PingTimeout, 999) == 0 + + def test_set_recv_callback_returns_zero(self) -> None: + p = Partner() + assert p.set_recv_callback() == 0 + + def test_set_send_callback_returns_zero(self) -> None: + p = Partner() + assert p.set_send_callback() == 0 + + +# --------------------------------------------------------------------------- +# Dual-partner integration tests using raw socket pairing +# --------------------------------------------------------------------------- + + +def _make_socket_pair() -> tuple[socket.socket, socket.socket]: + """Create a connected TCP socket pair via a temporary server socket.""" + srv = socket.socket(socket.AF_INET, socket.SOCK_STREAM) + srv.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) + srv.bind(("127.0.0.1", 0)) + srv.listen(1) + port = srv.getsockname()[1] + + client = socket.socket(socket.AF_INET, socket.SOCK_STREAM) + client.connect(("127.0.0.1", port)) + server_side, _ = srv.accept() + srv.close() + return client, server_side + + +def _wire_partner(partner: Partner, sock: socket.socket) -> None: + """Wire a connected socket into a Partner so it appears connected.""" + conn = ISOTCPConnection(host="127.0.0.1", port=0, local_tsap=0x0100, remote_tsap=0x0102) + conn.socket = sock + conn.connected = True + partner._socket = sock + partner._connection = conn + partner.connected = True + partner.running = True + + +@pytest.mark.partner +class TestDualPartner: + """Integration tests using two Partner instances exchanging data over sockets.""" + + def test_active_to_passive_send(self) -> None: + sock_a, sock_b = _make_socket_pair() + pa, pb = Partner(), Partner() + try: + _wire_partner(pa, sock_a) + _wire_partner(pb, sock_b) + + payload = b"Hello from A" + pa.set_send_data(payload) + + errors: list[Exception] = [] + + def do_send() -> None: + try: + pa.b_send() + except Exception as e: + errors.append(e) + + t = threading.Thread(target=do_send) + t.start() + + assert pb.b_recv() == 0 + t.join(timeout=3.0) + assert pb.get_recv_data() == payload + assert not errors + finally: + pa.stop() + pb.stop() + + def test_passive_to_active_send(self) -> None: + sock_a, sock_b = _make_socket_pair() + pa, pb = Partner(), Partner() + try: + _wire_partner(pa, sock_a) + _wire_partner(pb, sock_b) + + payload = b"Hello from B" + pb.set_send_data(payload) + + errors: list[Exception] = [] + + def do_send() -> None: + try: + pb.b_send() + except Exception as e: + errors.append(e) + + t = threading.Thread(target=do_send) + t.start() + + assert pa.b_recv() == 0 + t.join(timeout=3.0) + assert pa.get_recv_data() == payload + assert not errors + finally: + pa.stop() + pb.stop() + + def test_bidirectional_exchange(self) -> None: + sock_a, sock_b = _make_socket_pair() + pa, pb = Partner(), Partner() + try: + _wire_partner(pa, sock_a) + _wire_partner(pb, sock_b) + + errors: list[Exception] = [] + + # A -> B + pa.set_send_data(b"A->B") + + def send_a() -> None: + try: + pa.b_send() + except Exception as e: + errors.append(e) + + t1 = threading.Thread(target=send_a) + t1.start() + pb.b_recv() + t1.join(timeout=3.0) + assert pb.get_recv_data() == b"A->B" + + # B -> A + pb.set_send_data(b"B->A") + + def send_b() -> None: + try: + pb.b_send() + except Exception as e: + errors.append(e) + + t2 = threading.Thread(target=send_b) + t2.start() + pa.b_recv() + t2.join(timeout=3.0) + assert pa.get_recv_data() == b"B->A" + assert not errors + finally: + pa.stop() + pb.stop() + + def test_various_payload_sizes(self) -> None: + sock_a, sock_b = _make_socket_pair() + pa, pb = Partner(), Partner() + try: + _wire_partner(pa, sock_a) + _wire_partner(pb, sock_b) + + for size in [1, 10, 100, 480]: + payload = (bytes(range(256)) * (size // 256 + 1))[:size] + pa.set_send_data(payload) + errors: list[Exception] = [] + + def do_send() -> None: + try: + pa.b_send() + except Exception as e: + errors.append(e) + + t = threading.Thread(target=do_send) + t.start() + pb.b_recv() + t.join(timeout=3.0) + assert pb.get_recv_data() == payload, f"Failed for size {size}" + assert not errors + finally: + pa.stop() + pb.stop() + + def test_stats_updated_after_exchange(self) -> None: + sock_a, sock_b = _make_socket_pair() + pa, pb = Partner(), Partner() + try: + _wire_partner(pa, sock_a) + _wire_partner(pb, sock_b) + + payload = b"stats test" + pa.set_send_data(payload) + + def do_send() -> None: + pa.b_send() + + t = threading.Thread(target=do_send) + t.start() + pb.b_recv() + t.join(timeout=3.0) + + sent, _, s_err, _ = pa.get_stats() + assert sent.value == len(payload) + assert s_err.value == 0 + + _, recv, _, r_err = pb.get_stats() + assert recv.value == len(payload) + assert r_err.value == 0 + + send_t, _ = pa.get_times() + assert send_t.value >= 0 + _, recv_t = pb.get_times() + assert recv_t.value >= 0 + finally: + pa.stop() + pb.stop() + + def test_status_connected(self) -> None: + sock_a, sock_b = _make_socket_pair() + pa, pb = Partner(), Partner() + try: + _wire_partner(pa, sock_a) + _wire_partner(pb, sock_b) + assert pa.get_status().value == PartnerStatus.CONNECTED + assert pb.get_status().value == PartnerStatus.CONNECTED + finally: + pa.stop() + pb.stop() + + def test_status_after_stop(self) -> None: + sock_a, sock_b = _make_socket_pair() + pa, pb = Partner(), Partner() + try: + _wire_partner(pa, sock_a) + _wire_partner(pb, sock_b) + pa.stop() + assert pa.get_status().value == PartnerStatus.STOPPED + finally: + pa.stop() + pb.stop() + + def test_recv_callback_fires(self) -> None: + sock_a, sock_b = _make_socket_pair() + pa, pb = Partner(), Partner() + try: + _wire_partner(pa, sock_a) + _wire_partner(pb, sock_b) + + received_data: list[bytes] = [] + pb._recv_callback = lambda data: received_data.append(data) + + payload = b"callback test" + pa.set_send_data(payload) + + def do_send() -> None: + pa.b_send() + + t = threading.Thread(target=do_send) + t.start() + pb.b_recv() + t.join(timeout=3.0) + + assert len(received_data) == 1 + assert received_data[0] == payload + finally: + pa.stop() + pb.stop() + + def test_b_recv_error_returns_negative(self) -> None: + """b_recv returns -1 on receive error when no data arrives.""" + sock_a, sock_b = _make_socket_pair() + pa, pb = Partner(), Partner() + try: + _wire_partner(pa, sock_a) + _wire_partner(pb, sock_b) + # Close sender side so receiver gets an error + sock_a.close() + result = pb.b_recv() + assert result == -1 + finally: + pa.stop() + pb.stop() + + +# --------------------------------------------------------------------------- +# Passive partner accept/listen tests +# --------------------------------------------------------------------------- + + +@pytest.mark.partner +class TestPassivePartner: + """Tests for passive partner listening and accept behavior.""" + + def test_accept_connection_server_socket_none(self) -> None: + """_accept_connection returns immediately if server socket is None.""" + p = Partner(active=False) + p._server_socket = None + p._accept_connection() # Should not raise + + +# --------------------------------------------------------------------------- +# Active partner connection error tests +# --------------------------------------------------------------------------- + + +@pytest.mark.partner +class TestPartnerConnectionErrors: + """Tests for connection error paths.""" + + def test_active_no_remote_ip(self) -> None: + p = Partner(active=True) + with pytest.raises(S7ConnectionError, match="Remote IP"): + p.start_to("127.0.0.1", "", 0x0100, 0x0102) + + def test_active_connect_refused(self) -> None: + p = Partner(active=True) + port = _free_port() + p.port = port + with pytest.raises(S7ConnectionError): + p.start_to("127.0.0.1", "127.0.0.1", 0x0100, 0x0102) + + def test_b_send_increments_send_errors(self) -> None: + p = Partner() + p.set_send_data(b"data") + try: + p.b_send() + except S7ConnectionError: + pass + _, _, s_err, _ = p.get_stats() + assert s_err.value == 1 + + def test_b_recv_increments_recv_errors(self) -> None: + p = Partner() + p.b_recv() + _, _, _, r_err = p.get_stats() + assert r_err.value == 1 + + if __name__ == "__main__": unittest.main() diff --git a/tests/test_partner_coverage.py b/tests/test_partner_coverage.py deleted file mode 100644 index bc36b043..00000000 --- a/tests/test_partner_coverage.py +++ /dev/null @@ -1,625 +0,0 @@ -"""Extended tests for snap7/partner.py to improve coverage. - -Includes unit tests for PDU building/parsing and dual-partner -integration tests for bidirectional data exchange. -""" - -import socket -import struct -import threading -import time - -import pytest - -from snap7.connection import ISOTCPConnection -from snap7.error import S7Error, S7ConnectionError -from snap7.partner import Partner, PartnerStatus -from snap7.type import Parameter - - -def _free_port() -> int: - """Return a free TCP port chosen by the OS.""" - with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s: - s.bind(("127.0.0.1", 0)) - return s.getsockname()[1] - - -# --------------------------------------------------------------------------- -# PDU building / parsing unit tests (no network required) -# --------------------------------------------------------------------------- - - -@pytest.mark.partner -class TestPartnerPDU: - """Unit tests for partner PDU building and parsing.""" - - def test_build_partner_data_pdu_small(self) -> None: - p = Partner() - data = b"\x01\x02\x03" - pdu = p._build_partner_data_pdu(data) - assert pdu[0:1] == b"\x32" - assert pdu[1:2] == b"\x07" - assert struct.unpack(">H", pdu[2:4])[0] == len(data) - assert pdu[6:] == data - - def test_build_partner_data_pdu_empty(self) -> None: - p = Partner() - pdu = p._build_partner_data_pdu(b"") - assert pdu[0:1] == b"\x32" - assert struct.unpack(">H", pdu[2:4])[0] == 0 - - def test_build_partner_data_pdu_large(self) -> None: - p = Partner() - data = bytes(range(256)) * 4 # 1024 bytes - pdu = p._build_partner_data_pdu(data) - assert struct.unpack(">H", pdu[2:4])[0] == 1024 - assert pdu[6:] == data - - def test_parse_partner_data_pdu_roundtrip(self) -> None: - p = Partner() - original = b"Hello, Partner!" - pdu = p._build_partner_data_pdu(original) - parsed = p._parse_partner_data_pdu(pdu) - assert parsed == original - - def test_parse_partner_data_pdu_roundtrip_various_sizes(self) -> None: - p = Partner() - for size in [0, 1, 10, 100, 500, 1024]: - data = (bytes(range(256)) * (size // 256 + 1))[:size] - pdu = p._build_partner_data_pdu(data) - assert p._parse_partner_data_pdu(pdu) == data - - def test_parse_partner_data_pdu_too_short(self) -> None: - p = Partner() - with pytest.raises(S7Error, match="too short"): - p._parse_partner_data_pdu(b"\x32\x07\x00") - - def test_build_partner_ack(self) -> None: - p = Partner() - ack = p._build_partner_ack() - assert len(ack) == 6 - assert ack[0:1] == b"\x32" - assert ack[1:2] == b"\x08" - - def test_parse_partner_ack_valid(self) -> None: - p = Partner() - ack = p._build_partner_ack() - p._parse_partner_ack(ack) - - def test_parse_partner_ack_too_short(self) -> None: - p = Partner() - with pytest.raises(S7Error, match="too short"): - p._parse_partner_ack(b"\x32") - - def test_parse_partner_ack_wrong_type(self) -> None: - p = Partner() - bad_ack = struct.pack(">BBHH", 0x32, 0x07, 0x0000, 0x0000) - with pytest.raises(S7Error, match="Expected partner ACK"): - p._parse_partner_ack(bad_ack) - - def test_ack_roundtrip(self) -> None: - p = Partner() - ack = p._build_partner_ack() - p._parse_partner_ack(ack) - - -# --------------------------------------------------------------------------- -# Status, stats, lifecycle tests -# --------------------------------------------------------------------------- - - -@pytest.mark.partner -class TestPartnerLifecycle: - """Tests for partner lifecycle, status, and context manager.""" - - def test_initial_status_stopped(self) -> None: - p = Partner() - assert p.get_status().value == PartnerStatus.STOPPED - - def test_status_running_passive(self) -> None: - port = _free_port() - p = Partner(active=False) - p.port = port - try: - p.start_to("127.0.0.1", "", 0x0100, 0x0102) - assert p.running is True - assert p.get_status().value == PartnerStatus.RUNNING - finally: - p.stop() - - def test_stop_idempotent(self) -> None: - p = Partner() - p.stop() - p.stop() - - def test_destroy_returns_zero(self) -> None: - p = Partner() - assert p.destroy() == 0 - - def test_context_manager(self) -> None: - port = _free_port() - with Partner(active=False) as p: - p.port = port - p.start_to("127.0.0.1", "", 0x0100, 0x0102) - assert p.running is True - assert p.running is False - - def test_del_cleanup(self) -> None: - port = _free_port() - p = Partner(active=False) - p.port = port - p.start_to("127.0.0.1", "", 0x0100, 0x0102) - assert p.running is True - p.__del__() - assert p.running is False - - def test_create_noop(self) -> None: - p = Partner() - p.create(active=True) - - def test_get_stats_initial(self) -> None: - p = Partner() - sent, recv, s_err, r_err = p.get_stats() - assert sent.value == 0 - assert recv.value == 0 - assert s_err.value == 0 - assert r_err.value == 0 - - def test_get_times_initial(self) -> None: - p = Partner() - send_t, recv_t = p.get_times() - assert send_t.value == 0 - assert recv_t.value == 0 - - def test_get_last_error_initial(self) -> None: - p = Partner() - assert p.get_last_error().value == 0 - - -# --------------------------------------------------------------------------- -# Send / recv data buffer tests -# --------------------------------------------------------------------------- - - -@pytest.mark.partner -class TestPartnerSendRecvBuffers: - """Tests for set_send_data / get_recv_data and error paths.""" - - def test_set_send_data_and_retrieve(self) -> None: - p = Partner() - assert p._send_data is None - p.set_send_data(b"test") - assert p._send_data == b"test" - - def test_get_recv_data_initially_none(self) -> None: - p = Partner() - assert p.get_recv_data() is None - - def test_b_send_no_data(self) -> None: - p = Partner() - assert p.b_send() == -1 - - def test_b_send_not_connected(self) -> None: - p = Partner() - p.set_send_data(b"data") - with pytest.raises(S7ConnectionError, match="Not connected"): - p.b_send() - - def test_b_recv_not_connected(self) -> None: - p = Partner() - result = p.b_recv() - assert result == -1 - assert p.get_recv_data() is None - - def test_as_b_send_no_data(self) -> None: - p = Partner() - assert p.as_b_send() == -1 - - def test_as_b_send_not_connected(self) -> None: - p = Partner() - p.set_send_data(b"data") - result = p.as_b_send() - assert result == -1 - - def test_check_as_b_recv_completion_empty(self) -> None: - p = Partner() - assert p.check_as_b_recv_completion() == 1 - - def test_check_as_b_recv_completion_with_data(self) -> None: - p = Partner() - p._async_recv_queue.put(b"queued data") - assert p.check_as_b_recv_completion() == 0 - assert p._recv_data == b"queued data" - - def test_check_as_b_send_completion_not_in_progress(self) -> None: - p = Partner() - status, result = p.check_as_b_send_completion() - assert status == "job complete" - - def test_check_as_b_send_completion_in_progress(self) -> None: - p = Partner() - p._async_send_in_progress = True - status, result = p.check_as_b_send_completion() - assert status == "job in progress" - - def test_wait_as_b_send_no_operation(self) -> None: - p = Partner() - with pytest.raises(RuntimeError, match="No async send"): - p.wait_as_b_send_completion() - - def test_wait_as_b_send_timeout(self) -> None: - p = Partner() - p._async_send_in_progress = True - result = p.wait_as_b_send_completion(timeout=50) - assert result == -1 - - def test_wait_as_b_send_completes(self) -> None: - p = Partner() - p._async_send_in_progress = True - p._async_send_result = 0 - - def clear_flag() -> None: - time.sleep(0.05) - p._async_send_in_progress = False - - t = threading.Thread(target=clear_flag) - t.start() - result = p.wait_as_b_send_completion(timeout=2000) - t.join() - assert result == 0 - - -# --------------------------------------------------------------------------- -# Parameter tests -# --------------------------------------------------------------------------- - - -@pytest.mark.partner -class TestPartnerParams: - """Tests for get_param / set_param.""" - - def test_get_param_unsupported(self) -> None: - p = Partner() - with pytest.raises(RuntimeError, match="not supported"): - p.get_param(Parameter.MaxClients) - - def test_set_param_remote_port_raises(self) -> None: - p = Partner() - with pytest.raises(RuntimeError, match="Cannot set"): - p.set_param(Parameter.RemotePort, 1234) - - def test_set_param_local_port(self) -> None: - p = Partner() - p.set_param(Parameter.LocalPort, 5555) - assert p.local_port == 5555 - - def test_set_param_returns_zero(self) -> None: - p = Partner() - assert p.set_param(Parameter.PingTimeout, 999) == 0 - - def test_set_recv_callback_returns_zero(self) -> None: - p = Partner() - assert p.set_recv_callback() == 0 - - def test_set_send_callback_returns_zero(self) -> None: - p = Partner() - assert p.set_send_callback() == 0 - - -# --------------------------------------------------------------------------- -# Dual-partner integration tests using raw socket pairing -# --------------------------------------------------------------------------- - - -def _make_socket_pair() -> tuple[socket.socket, socket.socket]: - """Create a connected TCP socket pair via a temporary server socket.""" - srv = socket.socket(socket.AF_INET, socket.SOCK_STREAM) - srv.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) - srv.bind(("127.0.0.1", 0)) - srv.listen(1) - port = srv.getsockname()[1] - - client = socket.socket(socket.AF_INET, socket.SOCK_STREAM) - client.connect(("127.0.0.1", port)) - server_side, _ = srv.accept() - srv.close() - return client, server_side - - -def _wire_partner(partner: Partner, sock: socket.socket) -> None: - """Wire a connected socket into a Partner so it appears connected.""" - conn = ISOTCPConnection(host="127.0.0.1", port=0, local_tsap=0x0100, remote_tsap=0x0102) - conn.socket = sock - conn.connected = True - partner._socket = sock - partner._connection = conn - partner.connected = True - partner.running = True - - -@pytest.mark.partner -class TestDualPartner: - """Integration tests using two Partner instances exchanging data over sockets.""" - - def test_active_to_passive_send(self) -> None: - sock_a, sock_b = _make_socket_pair() - pa, pb = Partner(), Partner() - try: - _wire_partner(pa, sock_a) - _wire_partner(pb, sock_b) - - payload = b"Hello from A" - pa.set_send_data(payload) - - errors: list[Exception] = [] - - def do_send() -> None: - try: - pa.b_send() - except Exception as e: - errors.append(e) - - t = threading.Thread(target=do_send) - t.start() - - assert pb.b_recv() == 0 - t.join(timeout=3.0) - assert pb.get_recv_data() == payload - assert not errors - finally: - pa.stop() - pb.stop() - - def test_passive_to_active_send(self) -> None: - sock_a, sock_b = _make_socket_pair() - pa, pb = Partner(), Partner() - try: - _wire_partner(pa, sock_a) - _wire_partner(pb, sock_b) - - payload = b"Hello from B" - pb.set_send_data(payload) - - errors: list[Exception] = [] - - def do_send() -> None: - try: - pb.b_send() - except Exception as e: - errors.append(e) - - t = threading.Thread(target=do_send) - t.start() - - assert pa.b_recv() == 0 - t.join(timeout=3.0) - assert pa.get_recv_data() == payload - assert not errors - finally: - pa.stop() - pb.stop() - - def test_bidirectional_exchange(self) -> None: - sock_a, sock_b = _make_socket_pair() - pa, pb = Partner(), Partner() - try: - _wire_partner(pa, sock_a) - _wire_partner(pb, sock_b) - - errors: list[Exception] = [] - - # A -> B - pa.set_send_data(b"A->B") - - def send_a() -> None: - try: - pa.b_send() - except Exception as e: - errors.append(e) - - t1 = threading.Thread(target=send_a) - t1.start() - pb.b_recv() - t1.join(timeout=3.0) - assert pb.get_recv_data() == b"A->B" - - # B -> A - pb.set_send_data(b"B->A") - - def send_b() -> None: - try: - pb.b_send() - except Exception as e: - errors.append(e) - - t2 = threading.Thread(target=send_b) - t2.start() - pa.b_recv() - t2.join(timeout=3.0) - assert pa.get_recv_data() == b"B->A" - assert not errors - finally: - pa.stop() - pb.stop() - - def test_various_payload_sizes(self) -> None: - sock_a, sock_b = _make_socket_pair() - pa, pb = Partner(), Partner() - try: - _wire_partner(pa, sock_a) - _wire_partner(pb, sock_b) - - for size in [1, 10, 100, 480]: - payload = (bytes(range(256)) * (size // 256 + 1))[:size] - pa.set_send_data(payload) - errors: list[Exception] = [] - - def do_send() -> None: - try: - pa.b_send() - except Exception as e: - errors.append(e) - - t = threading.Thread(target=do_send) - t.start() - pb.b_recv() - t.join(timeout=3.0) - assert pb.get_recv_data() == payload, f"Failed for size {size}" - assert not errors - finally: - pa.stop() - pb.stop() - - def test_stats_updated_after_exchange(self) -> None: - sock_a, sock_b = _make_socket_pair() - pa, pb = Partner(), Partner() - try: - _wire_partner(pa, sock_a) - _wire_partner(pb, sock_b) - - payload = b"stats test" - pa.set_send_data(payload) - - def do_send() -> None: - pa.b_send() - - t = threading.Thread(target=do_send) - t.start() - pb.b_recv() - t.join(timeout=3.0) - - sent, _, s_err, _ = pa.get_stats() - assert sent.value == len(payload) - assert s_err.value == 0 - - _, recv, _, r_err = pb.get_stats() - assert recv.value == len(payload) - assert r_err.value == 0 - - send_t, _ = pa.get_times() - assert send_t.value >= 0 - _, recv_t = pb.get_times() - assert recv_t.value >= 0 - finally: - pa.stop() - pb.stop() - - def test_status_connected(self) -> None: - sock_a, sock_b = _make_socket_pair() - pa, pb = Partner(), Partner() - try: - _wire_partner(pa, sock_a) - _wire_partner(pb, sock_b) - assert pa.get_status().value == PartnerStatus.CONNECTED - assert pb.get_status().value == PartnerStatus.CONNECTED - finally: - pa.stop() - pb.stop() - - def test_status_after_stop(self) -> None: - sock_a, sock_b = _make_socket_pair() - pa, pb = Partner(), Partner() - try: - _wire_partner(pa, sock_a) - _wire_partner(pb, sock_b) - pa.stop() - assert pa.get_status().value == PartnerStatus.STOPPED - finally: - pa.stop() - pb.stop() - - def test_recv_callback_fires(self) -> None: - sock_a, sock_b = _make_socket_pair() - pa, pb = Partner(), Partner() - try: - _wire_partner(pa, sock_a) - _wire_partner(pb, sock_b) - - received_data: list[bytes] = [] - pb._recv_callback = lambda data: received_data.append(data) - - payload = b"callback test" - pa.set_send_data(payload) - - def do_send() -> None: - pa.b_send() - - t = threading.Thread(target=do_send) - t.start() - pb.b_recv() - t.join(timeout=3.0) - - assert len(received_data) == 1 - assert received_data[0] == payload - finally: - pa.stop() - pb.stop() - - def test_b_recv_error_returns_negative(self) -> None: - """b_recv returns -1 on receive error when no data arrives.""" - sock_a, sock_b = _make_socket_pair() - pa, pb = Partner(), Partner() - try: - _wire_partner(pa, sock_a) - _wire_partner(pb, sock_b) - # Close sender side so receiver gets an error - sock_a.close() - result = pb.b_recv() - assert result == -1 - finally: - pa.stop() - pb.stop() - - -# --------------------------------------------------------------------------- -# Passive partner accept/listen tests -# --------------------------------------------------------------------------- - - -@pytest.mark.partner -class TestPassivePartner: - """Tests for passive partner listening and accept behavior.""" - - def test_accept_connection_server_socket_none(self) -> None: - """_accept_connection returns immediately if server socket is None.""" - p = Partner(active=False) - p._server_socket = None - p._accept_connection() # Should not raise - - -# --------------------------------------------------------------------------- -# Active partner connection error tests -# --------------------------------------------------------------------------- - - -@pytest.mark.partner -class TestPartnerConnectionErrors: - """Tests for connection error paths.""" - - def test_active_no_remote_ip(self) -> None: - p = Partner(active=True) - with pytest.raises(S7ConnectionError, match="Remote IP"): - p.start_to("127.0.0.1", "", 0x0100, 0x0102) - - def test_active_connect_refused(self) -> None: - p = Partner(active=True) - port = _free_port() - p.port = port - with pytest.raises(S7ConnectionError): - p.start_to("127.0.0.1", "127.0.0.1", 0x0100, 0x0102) - - def test_b_send_increments_send_errors(self) -> None: - p = Partner() - p.set_send_data(b"data") - try: - p.b_send() - except S7ConnectionError: - pass - _, _, s_err, _ = p.get_stats() - assert s_err.value == 1 - - def test_b_recv_increments_recv_errors(self) -> None: - p = Partner() - p.b_recv() - _, _, _, r_err = p.get_stats() - assert r_err.value == 1 diff --git a/tests/test_s7commplus_codec.py b/tests/test_s7commplus_codec.py index 84a3212f..9b03881e 100644 --- a/tests/test_s7commplus_codec.py +++ b/tests/test_s7commplus_codec.py @@ -1,4 +1,4 @@ -"""Tests for S7CommPlus codec (header encoding, typed values).""" +"""Tests for S7CommPlus codec (header encoding, typed values, payload builders).""" import struct import pytest @@ -9,18 +9,34 @@ encode_request_header, decode_response_header, encode_typed_value, + encode_uint8, + decode_uint8, encode_uint16, decode_uint16, encode_uint32, decode_uint32, + encode_uint64, + decode_uint64, + encode_int16, + decode_int16, + encode_int32, + decode_int32, + encode_int64, + decode_int64, encode_float32, decode_float32, encode_float64, decode_float64, encode_wstring, decode_wstring, + encode_item_address, + encode_pvalue_blob, + decode_pvalue_to_bytes, + encode_object_qualifier, + _pvalue_element_size, ) -from snap7.s7commplus.protocol import PROTOCOL_ID, DataType, Opcode, FunctionCode +from snap7.s7commplus.protocol import PROTOCOL_ID, DataType, Opcode, FunctionCode, Ids +from snap7.s7commplus.vlq import encode_uint32_vlq, encode_int32_vlq, encode_uint64_vlq, encode_int64_vlq class TestFrameHeader: @@ -78,8 +94,19 @@ def test_roundtrip_request_response_header(self) -> None: assert result["session_id"] == 0x12345678 assert result["bytes_consumed"] == 14 + def test_decode_response_header_too_short(self) -> None: + with pytest.raises(ValueError, match="Not enough data"): + decode_response_header(bytes(10)) + class TestFixedWidth: + def test_uint8_roundtrip(self) -> None: + for val in [0, 1, 127, 255]: + encoded = encode_uint8(val) + decoded, consumed = decode_uint8(encoded) + assert decoded == val + assert consumed == 1 + def test_uint16_roundtrip(self) -> None: for val in [0, 1, 0xFF, 0xFFFF]: encoded = encode_uint16(val) @@ -94,6 +121,34 @@ def test_uint32_roundtrip(self) -> None: assert decoded == val assert consumed == 4 + def test_uint64_roundtrip(self) -> None: + for val in [0, 1, 0xFFFFFFFF, 0xFFFFFFFFFFFFFFFF]: + encoded = encode_uint64(val) + decoded, consumed = decode_uint64(encoded) + assert decoded == val + assert consumed == 8 + + def test_int16_roundtrip(self) -> None: + for val in [0, 1, -1, -32768, 32767]: + encoded = encode_int16(val) + decoded, consumed = decode_int16(encoded) + assert decoded == val + assert consumed == 2 + + def test_int32_roundtrip(self) -> None: + for val in [0, 1, -1, -2147483648, 2147483647]: + encoded = encode_int32(val) + decoded, consumed = decode_int32(encoded) + assert decoded == val + assert consumed == 4 + + def test_int64_roundtrip(self) -> None: + for val in [0, 1, -1, -(2**63), 2**63 - 1]: + encoded = encode_int64(val) + decoded, consumed = decode_int64(encoded) + assert decoded == val + assert consumed == 8 + def test_float32_roundtrip(self) -> None: for val in [0.0, 1.0, -1.0, 3.14]: encoded = encode_float32(val) @@ -108,6 +163,47 @@ def test_float64_roundtrip(self) -> None: assert decoded == val assert consumed == 8 + def test_uint8_with_offset(self) -> None: + data = bytes([0xFF, 42, 0xFF]) + decoded, consumed = decode_uint8(data, offset=1) + assert decoded == 42 + + def test_uint64_with_offset(self) -> None: + prefix = bytes(4) + data = prefix + encode_uint64(0x123456789ABCDEF0) + decoded, consumed = decode_uint64(data, offset=4) + assert decoded == 0x123456789ABCDEF0 + + def test_int16_with_offset(self) -> None: + prefix = bytes(3) + data = prefix + encode_int16(-1000) + decoded, consumed = decode_int16(data, offset=3) + assert decoded == -1000 + + def test_int32_with_offset(self) -> None: + prefix = bytes(2) + data = prefix + encode_int32(-100000) + decoded, consumed = decode_int32(data, offset=2) + assert decoded == -100000 + + def test_int64_with_offset(self) -> None: + prefix = bytes(5) + data = prefix + encode_int64(-(2**50)) + decoded, consumed = decode_int64(data, offset=5) + assert decoded == -(2**50) + + def test_float32_with_offset(self) -> None: + prefix = bytes(1) + data = prefix + encode_float32(2.5) + decoded, consumed = decode_float32(data, offset=1) + assert abs(decoded - 2.5) < 1e-6 + + def test_float64_with_offset(self) -> None: + prefix = bytes(3) + data = prefix + encode_float64(1.23456789) + decoded, consumed = decode_float64(data, offset=3) + assert decoded == 1.23456789 + class TestWString: def test_ascii(self) -> None: @@ -144,10 +240,52 @@ def test_usint(self) -> None: encoded = encode_typed_value(DataType.USINT, 42) assert encoded == bytes([DataType.USINT, 42]) + def test_byte(self) -> None: + encoded = encode_typed_value(DataType.BYTE, 0xAB) + assert encoded == bytes([DataType.BYTE, 0xAB]) + def test_uint(self) -> None: encoded = encode_typed_value(DataType.UINT, 0x1234) assert encoded == bytes([DataType.UINT]) + struct.pack(">H", 0x1234) + def test_word(self) -> None: + encoded = encode_typed_value(DataType.WORD, 0xBEEF) + assert encoded == bytes([DataType.WORD]) + struct.pack(">H", 0xBEEF) + + def test_udint(self) -> None: + encoded = encode_typed_value(DataType.UDINT, 100000) + assert encoded[0] == DataType.UDINT + # Rest is VLQ-encoded + assert len(encoded) > 1 + + def test_dword(self) -> None: + encoded = encode_typed_value(DataType.DWORD, 0xDEADBEEF) + assert encoded[0] == DataType.DWORD + + def test_ulint(self) -> None: + encoded = encode_typed_value(DataType.ULINT, 2**40) + assert encoded[0] == DataType.ULINT + + def test_lword(self) -> None: + encoded = encode_typed_value(DataType.LWORD, 0xCAFEBABE12345678) + assert encoded[0] == DataType.LWORD + + def test_sint(self) -> None: + encoded = encode_typed_value(DataType.SINT, -42) + assert encoded == bytes([DataType.SINT]) + struct.pack(">b", -42) + + def test_int(self) -> None: + encoded = encode_typed_value(DataType.INT, -1000) + assert encoded == bytes([DataType.INT]) + struct.pack(">h", -1000) + + def test_dint(self) -> None: + encoded = encode_typed_value(DataType.DINT, -100000) + assert encoded[0] == DataType.DINT + + def test_lint(self) -> None: + encoded = encode_typed_value(DataType.LINT, -(2**40)) + assert encoded[0] == DataType.LINT + def test_real(self) -> None: encoded = encode_typed_value(DataType.REAL, 1.0) assert encoded == bytes([DataType.REAL]) + struct.pack(">f", 1.0) @@ -156,10 +294,26 @@ def test_lreal(self) -> None: encoded = encode_typed_value(DataType.LREAL, 3.14) assert encoded == bytes([DataType.LREAL]) + struct.pack(">d", 3.14) + def test_timestamp(self) -> None: + ts = 0x0001020304050607 + encoded = encode_typed_value(DataType.TIMESTAMP, ts) + assert encoded == bytes([DataType.TIMESTAMP]) + struct.pack(">Q", ts) + + def test_timespan(self) -> None: + encoded = encode_typed_value(DataType.TIMESPAN, -5000) + assert encoded[0] == DataType.TIMESPAN + + def test_rid(self) -> None: + encoded = encode_typed_value(DataType.RID, 0x12345678) + assert encoded == bytes([DataType.RID]) + struct.pack(">I", 0x12345678) + + def test_aid(self) -> None: + encoded = encode_typed_value(DataType.AID, 306) + assert encoded[0] == DataType.AID + def test_wstring(self) -> None: encoded = encode_typed_value(DataType.WSTRING, "test") assert encoded[0] == DataType.WSTRING - # Should contain VLQ length + UTF-8 data assert b"test" in encoded def test_blob(self) -> None: @@ -171,3 +325,305 @@ def test_blob(self) -> None: def test_unsupported_type(self) -> None: with pytest.raises(ValueError, match="Unsupported DataType"): encode_typed_value(0xFF, None) + + +class TestItemAddress: + def test_basic_db_access(self) -> None: + addr_bytes, field_count = encode_item_address( + access_area=Ids.DB_ACCESS_AREA_BASE + 1, + access_sub_area=Ids.DB_VALUE_ACTUAL, + ) + assert isinstance(addr_bytes, bytes) + assert len(addr_bytes) > 0 + # No LIDs, so field_count = 4 (SymbolCrc + AccessArea + NumLIDs + AccessSubArea) + assert field_count == 4 + + def test_with_lids(self) -> None: + addr_bytes, field_count = encode_item_address( + access_area=Ids.DB_ACCESS_AREA_BASE + 1, + access_sub_area=Ids.DB_VALUE_ACTUAL, + lids=[1, 4], + ) + assert field_count == 6 # 4 + 2 LIDs + + def test_custom_symbol_crc(self) -> None: + addr_bytes, field_count = encode_item_address( + access_area=Ids.DB_ACCESS_AREA_BASE + 1, + access_sub_area=Ids.DB_VALUE_ACTUAL, + symbol_crc=0x1234, + ) + # First bytes should be VLQ(0x1234) which is non-zero + assert addr_bytes[0] != 0 + assert field_count == 4 + + +class TestPValueBlob: + def test_basic_blob(self) -> None: + data = bytes([1, 2, 3, 4]) + encoded = encode_pvalue_blob(data) + assert encoded[0] == 0x00 # flags + assert encoded[1] == DataType.BLOB + assert encoded.endswith(data) + + def test_empty_blob(self) -> None: + encoded = encode_pvalue_blob(b"") + assert encoded[0] == 0x00 + assert encoded[1] == DataType.BLOB + + def test_roundtrip_with_decode(self) -> None: + data = bytes([0xDE, 0xAD, 0xBE, 0xEF]) + encoded = encode_pvalue_blob(data) + decoded, consumed = decode_pvalue_to_bytes(encoded, 0) + assert decoded == data + assert consumed == len(encoded) + + +class TestDecodePValue: + """Test decode_pvalue_to_bytes for all scalar and array type branches.""" + + def test_null(self) -> None: + data = bytes([0x00, DataType.NULL]) + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == b"" + assert consumed == 2 + + def test_bool_true(self) -> None: + data = bytes([0x00, DataType.BOOL, 0x01]) + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == bytes([0x01]) + assert consumed == 3 + + def test_bool_false(self) -> None: + data = bytes([0x00, DataType.BOOL, 0x00]) + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == bytes([0x00]) + + def test_usint(self) -> None: + data = bytes([0x00, DataType.USINT, 42]) + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == bytes([42]) + assert consumed == 3 + + def test_byte(self) -> None: + data = bytes([0x00, DataType.BYTE, 0xAB]) + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == bytes([0xAB]) + + def test_sint(self) -> None: + data = bytes([0x00, DataType.SINT, 0xD6]) # -42 as unsigned byte + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == bytes([0xD6]) + + def test_uint(self) -> None: + raw = struct.pack(">H", 0x1234) + data = bytes([0x00, DataType.UINT]) + raw + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == raw + + def test_word(self) -> None: + raw = struct.pack(">H", 0xBEEF) + data = bytes([0x00, DataType.WORD]) + raw + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == raw + + def test_int(self) -> None: + raw = struct.pack(">H", 0xFC18) # -1000 as unsigned + data = bytes([0x00, DataType.INT]) + raw + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == raw + + def test_udint(self) -> None: + vlq = encode_uint32_vlq(100000) + data = bytes([0x00, DataType.UDINT]) + vlq + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == struct.pack(">I", 100000) + + def test_dword(self) -> None: + vlq = encode_uint32_vlq(0xDEADBEEF) + data = bytes([0x00, DataType.DWORD]) + vlq + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == struct.pack(">I", 0xDEADBEEF) + + def test_dint_positive(self) -> None: + vlq = encode_int32_vlq(12345) + data = bytes([0x00, DataType.DINT]) + vlq + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == struct.pack(">i", 12345) + + def test_dint_negative(self) -> None: + vlq = encode_int32_vlq(-100000) + data = bytes([0x00, DataType.DINT]) + vlq + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == struct.pack(">i", -100000) + + def test_real(self) -> None: + raw = struct.pack(">f", 3.14) + data = bytes([0x00, DataType.REAL]) + raw + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == raw + + def test_lreal(self) -> None: + raw = struct.pack(">d", 2.718281828) + data = bytes([0x00, DataType.LREAL]) + raw + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == raw + + def test_ulint(self) -> None: + vlq = encode_uint64_vlq(2**40) + data = bytes([0x00, DataType.ULINT]) + vlq + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == struct.pack(">Q", 2**40) + + def test_lword(self) -> None: + vlq = encode_uint64_vlq(0xCAFEBABE12345678) + data = bytes([0x00, DataType.LWORD]) + vlq + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == struct.pack(">Q", 0xCAFEBABE12345678) + + def test_lint_positive(self) -> None: + vlq = encode_int64_vlq(2**50) + data = bytes([0x00, DataType.LINT]) + vlq + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == struct.pack(">q", 2**50) + + def test_lint_negative(self) -> None: + vlq = encode_int64_vlq(-(2**40)) + data = bytes([0x00, DataType.LINT]) + vlq + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == struct.pack(">q", -(2**40)) + + def test_timestamp(self) -> None: + ts = 0x0001020304050607 + raw = struct.pack(">Q", ts) + data = bytes([0x00, DataType.TIMESTAMP]) + raw + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == raw + assert consumed == 10 # 2 header + 8 bytes + + def test_timespan_positive(self) -> None: + vlq = encode_int64_vlq(5000000) + data = bytes([0x00, DataType.TIMESPAN]) + vlq + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == struct.pack(">q", 5000000) + + def test_timespan_negative(self) -> None: + vlq = encode_int64_vlq(-5000000) + data = bytes([0x00, DataType.TIMESPAN]) + vlq + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == struct.pack(">q", -5000000) + + def test_rid(self) -> None: + raw = struct.pack(">I", 0x12345678) + data = bytes([0x00, DataType.RID]) + raw + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == raw + + def test_aid(self) -> None: + vlq = encode_uint32_vlq(306) + data = bytes([0x00, DataType.AID]) + vlq + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == struct.pack(">I", 306) + + def test_blob(self) -> None: + blob_data = bytes([0xDE, 0xAD, 0xBE, 0xEF]) + vlq_len = encode_uint32_vlq(len(blob_data)) + data = bytes([0x00, DataType.BLOB]) + vlq_len + blob_data + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == blob_data + + def test_wstring(self) -> None: + text = "hello".encode("utf-8") + vlq_len = encode_uint32_vlq(len(text)) + data = bytes([0x00, DataType.WSTRING]) + vlq_len + text + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == text + + def test_struct_nested(self) -> None: + # Struct with 2 USINT elements + vlq_count = encode_uint32_vlq(2) + elem1 = bytes([0x00, DataType.USINT, 0x0A]) + elem2 = bytes([0x00, DataType.USINT, 0x14]) + data = bytes([0x00, DataType.STRUCT]) + vlq_count + elem1 + elem2 + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == bytes([0x0A, 0x14]) + + def test_unsupported_type(self) -> None: + data = bytes([0x00, 0xFF]) + with pytest.raises(ValueError, match="Unsupported PValue datatype"): + decode_pvalue_to_bytes(data, 0) + + def test_too_short_header(self) -> None: + with pytest.raises(ValueError, match="Not enough data for PValue header"): + decode_pvalue_to_bytes(bytes([0x00]), 0) + + def test_with_offset(self) -> None: + prefix = bytes([0xFF, 0xFF, 0xFF]) + pvalue = bytes([0x00, DataType.USINT, 42]) + result, consumed = decode_pvalue_to_bytes(prefix + pvalue, 3) + assert result == bytes([42]) + + # -- Array tests -- + + def test_array_fixed_size_usint(self) -> None: + count_vlq = encode_uint32_vlq(3) + elements = bytes([10, 20, 30]) + data = bytes([0x10, DataType.USINT]) + count_vlq + elements + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == elements + + def test_array_fixed_size_uint(self) -> None: + count_vlq = encode_uint32_vlq(2) + elements = struct.pack(">HH", 1000, 2000) + data = bytes([0x10, DataType.UINT]) + count_vlq + elements + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == elements + + def test_array_fixed_size_real(self) -> None: + count_vlq = encode_uint32_vlq(2) + elements = struct.pack(">ff", 1.0, 2.0) + data = bytes([0x10, DataType.REAL]) + count_vlq + elements + result, consumed = decode_pvalue_to_bytes(data, 0) + assert result == elements + + def test_array_variable_length_udint(self) -> None: + # Variable-length array (VLQ-encoded elements) + count_vlq = encode_uint32_vlq(2) + elem1 = encode_uint32_vlq(100) + elem2 = encode_uint32_vlq(200) + data = bytes([0x10, DataType.UDINT]) + count_vlq + elem1 + elem2 + result, consumed = decode_pvalue_to_bytes(data, 0) + # Result re-encodes each element as VLQ + assert result == encode_uint32_vlq(100) + encode_uint32_vlq(200) + + +class TestPValueElementSize: + def test_single_byte_types(self) -> None: + for dt in (DataType.BOOL, DataType.USINT, DataType.BYTE, DataType.SINT): + assert _pvalue_element_size(dt) == 1 + + def test_two_byte_types(self) -> None: + for dt in (DataType.UINT, DataType.WORD, DataType.INT): + assert _pvalue_element_size(dt) == 2 + + def test_four_byte_types(self) -> None: + assert _pvalue_element_size(DataType.REAL) == 4 + assert _pvalue_element_size(DataType.RID) == 4 + + def test_eight_byte_types(self) -> None: + assert _pvalue_element_size(DataType.LREAL) == 8 + assert _pvalue_element_size(DataType.TIMESTAMP) == 8 + + def test_variable_length_types(self) -> None: + for dt in (DataType.UDINT, DataType.DWORD, DataType.BLOB, DataType.WSTRING, DataType.STRUCT): + assert _pvalue_element_size(dt) == 0 + + +class TestObjectQualifier: + def test_encode(self) -> None: + result = encode_object_qualifier() + assert isinstance(result, bytes) + assert len(result) > 0 + # Starts with ObjectQualifier ID (1256) as uint32 big-endian + assert result[:4] == struct.pack(">I", Ids.OBJECT_QUALIFIER) + # Ends with null terminator + assert result[-1] == 0x00 diff --git a/tests/test_s7commplus_unit.py b/tests/test_s7commplus_unit.py new file mode 100644 index 00000000..f7c5e57e --- /dev/null +++ b/tests/test_s7commplus_unit.py @@ -0,0 +1,459 @@ +"""Unit tests for S7CommPlus client payload builders, connection parsing, and error paths.""" + +import struct +import pytest + +from snap7.s7commplus.client import ( + S7CommPlusClient, + _build_read_payload, + _parse_read_response, + _build_write_payload, + _parse_write_response, +) +from snap7.s7commplus.codec import encode_pvalue_blob +from snap7.s7commplus.connection import S7CommPlusConnection, _element_size +from snap7.s7commplus.protocol import DataType, ElementID, ObjectId +from snap7.s7commplus.vlq import ( + encode_uint32_vlq, + encode_uint64_vlq, + encode_int32_vlq, + decode_uint32_vlq, +) + + +# -- Payload builder / parser tests -- + + +class TestBuildReadPayload: + def test_single_item(self) -> None: + payload = _build_read_payload([(1, 0, 4)]) + assert isinstance(payload, bytes) + assert len(payload) > 0 + + def test_multi_item(self) -> None: + payload = _build_read_payload([(1, 0, 4), (2, 10, 8)]) + assert isinstance(payload, bytes) + # Multi-item payload should be larger than single + single = _build_read_payload([(1, 0, 4)]) + assert len(payload) > len(single) + + +class TestParseReadResponse: + @staticmethod + def _build_response( + return_value: int = 0, + items: list[bytes] | None = None, + errors: list[tuple[int, int]] | None = None, + ) -> bytes: + """Build a synthetic GetMultiVariables response.""" + result = bytearray() + # ReturnValue (UInt64 VLQ) + result += encode_uint64_vlq(return_value) + + # Value list + if items: + for i, item_data in enumerate(items, 1): + result += encode_uint32_vlq(i) # ItemNumber + result += encode_pvalue_blob(item_data) # PValue + result += encode_uint32_vlq(0) # Terminator + + # Error list + if errors: + for err_item_nr, err_value in errors: + result += encode_uint32_vlq(err_item_nr) + result += encode_uint64_vlq(err_value) + result += encode_uint32_vlq(0) # Terminator + + return bytes(result) + + def test_single_item_success(self) -> None: + data = bytes([1, 2, 3, 4]) + response = self._build_response(items=[data]) + results = _parse_read_response(response) + assert len(results) == 1 + assert results[0] == data + + def test_multi_item_success(self) -> None: + data1 = bytes([0x0A, 0x0B]) + data2 = bytes([0x0C, 0x0D, 0x0E]) + response = self._build_response(items=[data1, data2]) + results = _parse_read_response(response) + assert len(results) == 2 + assert results[0] == data1 + assert results[1] == data2 + + def test_error_return_value(self) -> None: + response = self._build_response(return_value=0x05A9) + results = _parse_read_response(response) + assert results == [] + + def test_empty_response(self) -> None: + response = self._build_response() + results = _parse_read_response(response) + assert results == [] + + def test_with_error_items(self) -> None: + data1 = bytes([1, 2, 3, 4]) + response = self._build_response(items=[data1], errors=[(2, 0xDEAD)]) + results = _parse_read_response(response) + assert len(results) == 2 + assert results[0] == data1 + assert results[1] is None # Error item + + +class TestParseWriteResponse: + @staticmethod + def _build_response(return_value: int = 0, errors: list[tuple[int, int]] | None = None) -> bytes: + result = bytearray() + result += encode_uint64_vlq(return_value) + if errors: + for err_item_nr, err_value in errors: + result += encode_uint32_vlq(err_item_nr) + result += encode_uint64_vlq(err_value) + result += encode_uint32_vlq(0) # Terminator + return bytes(result) + + def test_success(self) -> None: + response = self._build_response(return_value=0) + _parse_write_response(response) # Should not raise + + def test_error_return_value(self) -> None: + response = self._build_response(return_value=0x05A9) + with pytest.raises(RuntimeError, match="Write failed"): + _parse_write_response(response) + + def test_error_items(self) -> None: + response = self._build_response(return_value=0, errors=[(1, 0xDEAD)]) + with pytest.raises(RuntimeError, match="Write failed"): + _parse_write_response(response) + + +class TestBuildWritePayload: + def test_single_item(self) -> None: + payload = _build_write_payload([(1, 0, bytes([1, 2, 3, 4]))]) + assert isinstance(payload, bytes) + assert len(payload) > 0 + + def test_data_appears_in_payload(self) -> None: + data = bytes([0xDE, 0xAD, 0xBE, 0xEF]) + payload = _build_write_payload([(1, 0, data)]) + # The raw data should appear in the payload (inside the BLOB PValue) + assert data in payload + + +# -- Client/server payload agreement -- + + +class TestPayloadAgreement: + """Verify client payloads can be parsed by the server's request parser.""" + + def test_read_payload_roundtrip(self) -> None: + """Build a read payload, then manually verify it has expected structure.""" + payload = _build_read_payload([(1, 0, 4)]) + offset = 0 + + # LinkId (4 bytes fixed) + link_id = struct.unpack_from(">I", payload, offset)[0] + offset += 4 + assert link_id == 0 + + # Item count (VLQ) + item_count, consumed = decode_uint32_vlq(payload, offset) + offset += consumed + assert item_count == 1 + + # Total field count (VLQ) + total_fields, consumed = decode_uint32_vlq(payload, offset) + offset += consumed + assert total_fields == 6 # 4 base + 2 LIDs + + def test_write_read_consistency(self) -> None: + """Build write and read payloads for same address, verify both compile.""" + read_payload = _build_read_payload([(1, 0, 4)]) + write_payload = _build_write_payload([(1, 0, bytes([1, 2, 3, 4]))]) + assert isinstance(read_payload, bytes) + assert isinstance(write_payload, bytes) + + +# -- Connection unit tests -- + + +class TestConnectionElementSize: + def test_single_byte(self) -> None: + for dt in (DataType.BOOL, DataType.USINT, DataType.BYTE, DataType.SINT): + assert _element_size(dt) == 1 + + def test_two_byte(self) -> None: + for dt in (DataType.UINT, DataType.WORD, DataType.INT): + assert _element_size(dt) == 2 + + def test_four_byte(self) -> None: + for dt in (DataType.REAL, DataType.RID): + assert _element_size(dt) == 4 + + def test_eight_byte(self) -> None: + for dt in (DataType.LREAL, DataType.TIMESTAMP): + assert _element_size(dt) == 8 + + def test_variable_length(self) -> None: + for dt in (DataType.UDINT, DataType.BLOB, DataType.WSTRING, DataType.STRUCT): + assert _element_size(dt) == 0 + + +class TestSkipTypedValue: + """Test S7CommPlusConnection._skip_typed_value with constructed byte buffers.""" + + @pytest.fixture() + def conn(self) -> S7CommPlusConnection: + return S7CommPlusConnection("127.0.0.1") + + def test_null(self, conn: S7CommPlusConnection) -> None: + assert conn._skip_typed_value(b"", 0, DataType.NULL, 0x00) == 0 + + def test_bool(self, conn: S7CommPlusConnection) -> None: + data = bytes([0x01]) + assert conn._skip_typed_value(data, 0, DataType.BOOL, 0x00) == 1 + + def test_usint(self, conn: S7CommPlusConnection) -> None: + data = bytes([42]) + assert conn._skip_typed_value(data, 0, DataType.USINT, 0x00) == 1 + + def test_byte(self, conn: S7CommPlusConnection) -> None: + data = bytes([0xAB]) + assert conn._skip_typed_value(data, 0, DataType.BYTE, 0x00) == 1 + + def test_sint(self, conn: S7CommPlusConnection) -> None: + data = bytes([0xD6]) + assert conn._skip_typed_value(data, 0, DataType.SINT, 0x00) == 1 + + def test_uint(self, conn: S7CommPlusConnection) -> None: + data = struct.pack(">H", 1000) + assert conn._skip_typed_value(data, 0, DataType.UINT, 0x00) == 2 + + def test_word(self, conn: S7CommPlusConnection) -> None: + data = struct.pack(">H", 0xBEEF) + assert conn._skip_typed_value(data, 0, DataType.WORD, 0x00) == 2 + + def test_int(self, conn: S7CommPlusConnection) -> None: + data = struct.pack(">h", -1000) + assert conn._skip_typed_value(data, 0, DataType.INT, 0x00) == 2 + + def test_udint(self, conn: S7CommPlusConnection) -> None: + vlq = encode_uint32_vlq(100000) + new_offset = conn._skip_typed_value(vlq, 0, DataType.UDINT, 0x00) + assert new_offset == len(vlq) + + def test_dword(self, conn: S7CommPlusConnection) -> None: + vlq = encode_uint32_vlq(0xDEADBEEF) + new_offset = conn._skip_typed_value(vlq, 0, DataType.DWORD, 0x00) + assert new_offset == len(vlq) + + def test_aid(self, conn: S7CommPlusConnection) -> None: + vlq = encode_uint32_vlq(306) + new_offset = conn._skip_typed_value(vlq, 0, DataType.AID, 0x00) + assert new_offset == len(vlq) + + def test_dint(self, conn: S7CommPlusConnection) -> None: + vlq = encode_int32_vlq(-100000) + new_offset = conn._skip_typed_value(vlq, 0, DataType.DINT, 0x00) + assert new_offset == len(vlq) + + def test_ulint(self, conn: S7CommPlusConnection) -> None: + vlq = encode_uint64_vlq(2**40) + new_offset = conn._skip_typed_value(vlq, 0, DataType.ULINT, 0x00) + assert new_offset == len(vlq) + + def test_lword(self, conn: S7CommPlusConnection) -> None: + vlq = encode_uint64_vlq(0xCAFE) + new_offset = conn._skip_typed_value(vlq, 0, DataType.LWORD, 0x00) + assert new_offset == len(vlq) + + def test_lint(self, conn: S7CommPlusConnection) -> None: + from snap7.s7commplus.vlq import encode_int64_vlq + + vlq = encode_int64_vlq(-(2**40)) + new_offset = conn._skip_typed_value(vlq, 0, DataType.LINT, 0x00) + assert new_offset == len(vlq) + + def test_real(self, conn: S7CommPlusConnection) -> None: + data = struct.pack(">f", 3.14) + assert conn._skip_typed_value(data, 0, DataType.REAL, 0x00) == 4 + + def test_lreal(self, conn: S7CommPlusConnection) -> None: + data = struct.pack(">d", 2.718) + assert conn._skip_typed_value(data, 0, DataType.LREAL, 0x00) == 8 + + def test_timestamp(self, conn: S7CommPlusConnection) -> None: + data = struct.pack(">Q", 0x0001020304050607) + assert conn._skip_typed_value(data, 0, DataType.TIMESTAMP, 0x00) == 8 + + def test_timespan(self, conn: S7CommPlusConnection) -> None: + from snap7.s7commplus.vlq import encode_int64_vlq + + vlq = encode_int64_vlq(5000) + # TIMESPAN uses uint64_vlq for skipping in _skip_typed_value + new_offset = conn._skip_typed_value(vlq, 0, DataType.TIMESPAN, 0x00) + assert new_offset == len(vlq) + + def test_rid(self, conn: S7CommPlusConnection) -> None: + data = struct.pack(">I", 0x12345678) + assert conn._skip_typed_value(data, 0, DataType.RID, 0x00) == 4 + + def test_blob(self, conn: S7CommPlusConnection) -> None: + blob_data = bytes([1, 2, 3, 4]) + vlq_len = encode_uint32_vlq(len(blob_data)) + data = vlq_len + blob_data + new_offset = conn._skip_typed_value(data, 0, DataType.BLOB, 0x00) + assert new_offset == len(data) + + def test_wstring(self, conn: S7CommPlusConnection) -> None: + text = "hello".encode("utf-8") + vlq_len = encode_uint32_vlq(len(text)) + data = vlq_len + text + new_offset = conn._skip_typed_value(data, 0, DataType.WSTRING, 0x00) + assert new_offset == len(data) + + def test_struct(self, conn: S7CommPlusConnection) -> None: + # Struct with 2 USINT sub-values + vlq_count = encode_uint32_vlq(2) + sub1 = bytes([0x00, DataType.USINT, 0x0A]) # flags + type + value + sub2 = bytes([0x00, DataType.USINT, 0x14]) + data = vlq_count + sub1 + sub2 + new_offset = conn._skip_typed_value(data, 0, DataType.STRUCT, 0x00) + assert new_offset == len(data) + + def test_unknown_type(self, conn: S7CommPlusConnection) -> None: + # Unknown type should return same offset (can't skip) + assert conn._skip_typed_value(bytes([0xFF]), 0, 0xFF, 0x00) == 0 + + # -- Array tests -- + + def test_array_fixed_size(self, conn: S7CommPlusConnection) -> None: + count_vlq = encode_uint32_vlq(3) + elements = bytes([10, 20, 30]) + data = count_vlq + elements + new_offset = conn._skip_typed_value(data, 0, DataType.USINT, 0x10) + assert new_offset == len(data) + + def test_array_variable_length(self, conn: S7CommPlusConnection) -> None: + count_vlq = encode_uint32_vlq(2) + elem1 = encode_uint32_vlq(100) + elem2 = encode_uint32_vlq(200) + data = count_vlq + elem1 + elem2 + new_offset = conn._skip_typed_value(data, 0, DataType.UDINT, 0x10) + assert new_offset == len(data) + + def test_array_empty_data(self, conn: S7CommPlusConnection) -> None: + # Edge case: array flag but no data + assert conn._skip_typed_value(b"", 0, DataType.USINT, 0x10) == 0 + + +class TestParseCreateObjectResponse: + """Test _parse_create_object_response with constructed payloads.""" + + def _build_create_response_with_session_version(self, version: int, datatype: int = DataType.UDINT) -> bytes: + """Build a minimal CreateObject response containing ServerSessionVersion.""" + payload = bytearray() + # Attribute tag + payload += bytes([ElementID.ATTRIBUTE]) + # Attribute ID = ServerSessionVersion (306) + payload += encode_uint32_vlq(ObjectId.SERVER_SESSION_VERSION) + # Typed value: flags + datatype + VLQ value + payload += bytes([0x00, datatype]) + payload += encode_uint32_vlq(version) + return bytes(payload) + + def test_parse_udint_version(self) -> None: + conn = S7CommPlusConnection("127.0.0.1") + payload = self._build_create_response_with_session_version(3, DataType.UDINT) + conn._parse_create_object_response(payload) + assert conn._server_session_version == 3 + + def test_parse_dword_version(self) -> None: + conn = S7CommPlusConnection("127.0.0.1") + payload = self._build_create_response_with_session_version(2, DataType.DWORD) + conn._parse_create_object_response(payload) + assert conn._server_session_version == 2 + + def test_version_not_found(self) -> None: + conn = S7CommPlusConnection("127.0.0.1") + # Build payload with a different attribute, not ServerSessionVersion + payload = bytearray() + payload += bytes([ElementID.ATTRIBUTE]) + payload += encode_uint32_vlq(999) # Some other attribute ID + payload += bytes([0x00, DataType.USINT, 42]) + conn._parse_create_object_response(bytes(payload)) + assert conn._server_session_version is None + + def test_with_preceding_attributes(self) -> None: + conn = S7CommPlusConnection("127.0.0.1") + payload = bytearray() + # First attribute: some random one with a UINT value + payload += bytes([ElementID.ATTRIBUTE]) + payload += encode_uint32_vlq(100) # Random attribute ID + payload += bytes([0x00, DataType.UINT]) + payload += struct.pack(">H", 0x1234) + # Second attribute: ServerSessionVersion + payload += bytes([ElementID.ATTRIBUTE]) + payload += encode_uint32_vlq(ObjectId.SERVER_SESSION_VERSION) + payload += bytes([0x00, DataType.UDINT]) + payload += encode_uint32_vlq(1) + conn._parse_create_object_response(bytes(payload)) + assert conn._server_session_version == 1 + + def test_with_start_of_object(self) -> None: + conn = S7CommPlusConnection("127.0.0.1") + payload = bytearray() + # StartOfObject tag (needs RelationId + ClassId + ClassFlags + AttributeId) + payload += bytes([ElementID.START_OF_OBJECT]) + payload += struct.pack(">I", 0) # RelationId (4 bytes) + payload += encode_uint32_vlq(100) # ClassId + payload += encode_uint32_vlq(0) # ClassFlags + payload += encode_uint32_vlq(0) # AttributeId + # TerminatingObject + payload += bytes([ElementID.TERMINATING_OBJECT]) + # Now the attribute we want + payload += bytes([ElementID.ATTRIBUTE]) + payload += encode_uint32_vlq(ObjectId.SERVER_SESSION_VERSION) + payload += bytes([0x00, DataType.UDINT]) + payload += encode_uint32_vlq(3) + conn._parse_create_object_response(bytes(payload)) + assert conn._server_session_version == 3 + + +# -- Client error path tests -- + + +class TestClientErrorPaths: + def test_properties_not_connected(self) -> None: + client = S7CommPlusClient() + assert client.connected is False + assert client.protocol_version == 0 + assert client.session_id == 0 + assert client.using_legacy_fallback is False + + def test_db_read_not_connected(self) -> None: + client = S7CommPlusClient() + with pytest.raises(RuntimeError, match="Not connected"): + client.db_read(1, 0, 4) + + def test_db_write_not_connected(self) -> None: + client = S7CommPlusClient() + with pytest.raises(RuntimeError, match="Not connected"): + client.db_write(1, 0, bytes([1, 2, 3, 4])) + + def test_db_read_multi_not_connected(self) -> None: + client = S7CommPlusClient() + with pytest.raises(RuntimeError, match="Not connected"): + client.db_read_multi([(1, 0, 4)]) + + def test_explore_not_connected(self) -> None: + client = S7CommPlusClient() + with pytest.raises(RuntimeError, match="Not connected"): + client.explore() + + def test_context_manager_not_connected(self) -> None: + """Test that context manager works without connection (disconnect is a no-op).""" + with S7CommPlusClient() as client: + assert client.connected is False + # Should not raise diff --git a/tests/test_s7protocol_coverage.py b/tests/test_s7protocol.py similarity index 98% rename from tests/test_s7protocol_coverage.py rename to tests/test_s7protocol.py index 264c15bd..c0d62f1b 100644 --- a/tests/test_s7protocol_coverage.py +++ b/tests/test_s7protocol.py @@ -1,6 +1,8 @@ """Tests for snap7.s7protocol — response parsers with crafted PDUs, error paths.""" import struct +from typing import Any + import pytest from datetime import datetime @@ -227,7 +229,7 @@ def test_short_response(self) -> None: assert result["block_length"] == 0 def test_no_raw_parameters(self) -> None: - response = {} + response: dict[str, Any] = {} result = self.proto.parse_start_upload_response(response) assert result["upload_id"] == 0 @@ -259,7 +261,7 @@ def test_empty_response(self) -> None: assert result == b"" def test_no_data_key(self) -> None: - response = {} + response: dict[str, Any] = {} result = self.proto.parse_upload_response(response) assert result == b"" @@ -287,7 +289,7 @@ def test_empty_data(self) -> None: assert result["DBCount"] == 0 def test_no_data(self) -> None: - response = {} + response: dict[str, Any] = {} result = self.proto.parse_list_blocks_response(response) assert all(v == 0 for v in result.values()) @@ -315,7 +317,7 @@ def test_empty_data(self) -> None: assert result == [] def test_no_data(self) -> None: - response = {} + response: dict[str, Any] = {} result = self.proto.parse_list_blocks_of_type_response(response) assert result == [] @@ -353,7 +355,7 @@ def test_valid_data(self) -> None: assert result["version"] == 0x03 def test_no_data(self) -> None: - response = {} + response: dict[str, Any] = {} result = self.proto.parse_get_block_info_response(response) assert result["block_type"] == 0 @@ -383,7 +385,7 @@ def test_followup_fragment(self) -> None: assert result["szl_id"] == 0 def test_empty_data(self) -> None: - response = {} + response: dict[str, Any] = {} result = self.proto.parse_read_szl_response(response) assert result["data"] == b"" diff --git a/tests/test_server.py b/tests/test_server.py index 99ac7b60..4e17c895 100644 --- a/tests/test_server.py +++ b/tests/test_server.py @@ -1,14 +1,16 @@ from ctypes import c_char import logging import time +from datetime import datetime import pytest import unittest from threading import Thread +from snap7.client import Client from snap7.error import server_errors, error_text from snap7.server import Server -from snap7.type import SrvEvent, mkEvent, mkLog, SrvArea, Parameter +from snap7.type import SrvEvent, mkEvent, mkLog, SrvArea, Parameter, Block logging.basicConfig(level=logging.WARNING) @@ -237,8 +239,358 @@ def test_server_area_management(self) -> None: pass -if __name__ == "__main__": - import logging +ip = "127.0.0.1" +SERVER_PORT = 12200 + + +@pytest.mark.server +class TestServerBlockOperations(unittest.TestCase): + """Test block operations through client-server communication.""" + + server: Server = None # type: ignore + + @classmethod + def setUpClass(cls) -> None: + cls.server = Server() + # Register several DBs so list_blocks / list_blocks_of_type have something to report + cls.server.register_area(SrvArea.DB, 1, bytearray(100)) + cls.server.register_area(SrvArea.DB, 2, bytearray(200)) + cls.server.register_area(SrvArea.DB, 3, bytearray(50)) + # Also register other area types + cls.server.register_area(SrvArea.MK, 0, bytearray(64)) + cls.server.register_area(SrvArea.PA, 0, bytearray(64)) + cls.server.register_area(SrvArea.PE, 0, bytearray(64)) + cls.server.register_area(SrvArea.TM, 0, bytearray(64)) + cls.server.register_area(SrvArea.CT, 0, bytearray(64)) + cls.server.start(tcp_port=SERVER_PORT) + + @classmethod + def tearDownClass(cls) -> None: + if cls.server: + cls.server.stop() + cls.server.destroy() + + def setUp(self) -> None: + self.client = Client() + self.client.connect(ip, 0, 1, SERVER_PORT) + + def tearDown(self) -> None: + self.client.disconnect() + self.client.destroy() + + # ------------------------------------------------------------------ + # list_blocks + # ------------------------------------------------------------------ + def test_list_blocks(self) -> None: + """list_blocks() should return counts; DBCount >= 3 since we registered 3 DBs.""" + bl = self.client.list_blocks() + self.assertGreaterEqual(bl.DBCount, 3) + # OB/FB/FC should be 0 since the emulator only tracks DBs + self.assertEqual(bl.OBCount, 0) + self.assertEqual(bl.FBCount, 0) + self.assertEqual(bl.FCCount, 0) + + # ------------------------------------------------------------------ + # list_blocks_of_type + # ------------------------------------------------------------------ + def test_list_blocks_of_type_db(self) -> None: + """list_blocks_of_type(DB) should include the DB numbers we registered.""" + block_nums = self.client.list_blocks_of_type(Block.DB, 100) + self.assertIn(1, block_nums) + self.assertIn(2, block_nums) + self.assertIn(3, block_nums) + + def test_list_blocks_of_type_ob(self) -> None: + """list_blocks_of_type(OB) should return an empty list (no OBs registered).""" + block_nums = self.client.list_blocks_of_type(Block.OB, 100) + self.assertEqual(block_nums, []) + + # ------------------------------------------------------------------ + # get_block_info + # ------------------------------------------------------------------ + def test_get_block_info(self) -> None: + """get_block_info for a registered DB should return valid metadata.""" + info = self.client.get_block_info(Block.DB, 1) + self.assertEqual(info.MC7Size, 100) # matches registered size + self.assertEqual(info.BlkNumber, 1) + + def test_get_block_info_db2(self) -> None: + """get_block_info for DB2 with size 200.""" + info = self.client.get_block_info(Block.DB, 2) + self.assertEqual(info.MC7Size, 200) + self.assertEqual(info.BlkNumber, 2) + + # ------------------------------------------------------------------ + # upload (block transfer: START_UPLOAD -> UPLOAD -> END_UPLOAD) + # ------------------------------------------------------------------ + def test_upload(self) -> None: + """Upload a DB from the server and verify the returned data length.""" + # Write known data to DB1 first + test_data = bytearray(range(10)) + self.client.db_write(1, 0, test_data) + + # Upload the block + block_data = self.client.upload(1) + self.assertGreater(len(block_data), 0) + # Verify the first bytes match what we wrote + self.assertEqual(block_data[:10], test_data) + + def test_full_upload(self) -> None: + """full_upload should return block data and its size.""" + data, size = self.client.full_upload(Block.DB, 1) + self.assertGreater(size, 0) + self.assertEqual(len(data), size) + + # ------------------------------------------------------------------ + # download (block transfer: REQUEST_DOWNLOAD -> DOWNLOAD_BLOCK -> DOWNLOAD_ENDED) + # ------------------------------------------------------------------ + def test_download(self) -> None: + """Download data to a registered DB on the server.""" + download_data = bytearray([0xAA, 0xBB, 0xCC, 0xDD]) + result = self.client.download(download_data, block_num=1) + self.assertEqual(result, 0) + + # Verify the data was written by reading it back + read_back = self.client.db_read(1, 0, 4) + self.assertEqual(read_back, download_data) + + +@pytest.mark.server +class TestServerUserdataOperations(unittest.TestCase): + """Test USERDATA handlers (SZL, clock, CPU state) through client-server communication.""" + + server: Server = None # type: ignore + + @classmethod + def setUpClass(cls) -> None: + cls.server = Server() + cls.server.register_area(SrvArea.DB, 1, bytearray(100)) + cls.server.start(tcp_port=SERVER_PORT + 1) + + @classmethod + def tearDownClass(cls) -> None: + if cls.server: + cls.server.stop() + cls.server.destroy() + + def setUp(self) -> None: + self.client = Client() + self.client.connect(ip, 0, 1, SERVER_PORT + 1) + + def tearDown(self) -> None: + self.client.disconnect() + self.client.destroy() + + # ------------------------------------------------------------------ + # read_szl + # ------------------------------------------------------------------ + def test_read_szl_0x001c(self) -> None: + """read_szl(0x001C) should return component identification data.""" + szl = self.client.read_szl(0x001C, 0) + self.assertGreater(szl.Header.LengthDR, 0) + + def test_read_szl_0x0011(self) -> None: + """read_szl(0x0011) should return module identification data.""" + szl = self.client.read_szl(0x0011, 0) + self.assertGreater(szl.Header.LengthDR, 0) + + def test_read_szl_0x0131(self) -> None: + """read_szl(0x0131) should return communication parameters.""" + szl = self.client.read_szl(0x0131, 0) + self.assertGreater(szl.Header.LengthDR, 0) + + def test_read_szl_0x0232(self) -> None: + """read_szl(0x0232) should return protection level data.""" + szl = self.client.read_szl(0x0232, 0) + self.assertGreater(szl.Header.LengthDR, 0) + + def test_read_szl_0x0000(self) -> None: + """read_szl(0x0000) should return the list of available SZL IDs.""" + szl = self.client.read_szl(0x0000, 0) + self.assertGreater(szl.Header.LengthDR, 0) + + def test_read_szl_list(self) -> None: + """read_szl_list should return raw bytes of available SZL IDs.""" + data = self.client.read_szl_list() + self.assertIsInstance(data, bytes) + self.assertGreater(len(data), 0) + + # ------------------------------------------------------------------ + # get_cpu_info (uses read_szl 0x001C internally) + # ------------------------------------------------------------------ + def test_get_cpu_info(self) -> None: + """get_cpu_info should populate the S7CpuInfo structure.""" + info = self.client.get_cpu_info() + # The emulated server returns "CPU 315-2 PN/DP" + self.assertIn(b"CPU", info.ModuleTypeName) + + # ------------------------------------------------------------------ + # get_order_code (uses read_szl 0x0011 internally) + # ------------------------------------------------------------------ + def test_get_order_code(self) -> None: + """get_order_code should return order code data.""" + oc = self.client.get_order_code() + self.assertIn(b"6ES7", oc.OrderCode) + + # ------------------------------------------------------------------ + # get_cp_info (uses read_szl 0x0131 internally) + # ------------------------------------------------------------------ + def test_get_cp_info(self) -> None: + """get_cp_info should return communication parameters.""" + cp = self.client.get_cp_info() + self.assertGreater(cp.MaxPduLength, 0) + self.assertGreater(cp.MaxConnections, 0) + + # ------------------------------------------------------------------ + # get_protection (uses read_szl 0x0232 internally) + # ------------------------------------------------------------------ + def test_get_protection(self) -> None: + """get_protection should return protection settings.""" + prot = self.client.get_protection() + # Emulator returns no protection (sch_schal=1) + self.assertEqual(prot.sch_schal, 1) + + # ------------------------------------------------------------------ + # get/set PLC datetime (clock USERDATA handlers) + # ------------------------------------------------------------------ + def test_get_plc_datetime(self) -> None: + """get_plc_datetime should return a valid datetime object.""" + dt = self.client.get_plc_datetime() + self.assertIsInstance(dt, datetime) + # Should be recent (within last minute) + now = datetime.now() + delta = abs((now - dt).total_seconds()) + self.assertLess(delta, 60) + + def test_set_plc_datetime(self) -> None: + """set_plc_datetime should succeed (returns 0).""" + test_dt = datetime(2025, 6, 15, 12, 30, 45) + result = self.client.set_plc_datetime(test_dt) + self.assertEqual(result, 0) + + def test_set_plc_system_datetime(self) -> None: + """set_plc_system_datetime should succeed.""" + result = self.client.set_plc_system_datetime() + self.assertEqual(result, 0) + + # ------------------------------------------------------------------ + # get_cpu_state (SZL-based CPU state request) + # ------------------------------------------------------------------ + def test_get_cpu_state(self) -> None: + """get_cpu_state should return a string state.""" + state = self.client.get_cpu_state() + self.assertIsInstance(state, str) + + +@pytest.mark.server +class TestServerPLCControl(unittest.TestCase): + """Test PLC control operations (stop/start) through client-server communication.""" + + server: Server = None # type: ignore + + @classmethod + def setUpClass(cls) -> None: + cls.server = Server() + cls.server.register_area(SrvArea.DB, 1, bytearray(100)) + cls.server.start(tcp_port=SERVER_PORT + 2) - logging.basicConfig() + @classmethod + def tearDownClass(cls) -> None: + if cls.server: + cls.server.stop() + cls.server.destroy() + + def setUp(self) -> None: + self.client = Client() + self.client.connect(ip, 0, 1, SERVER_PORT + 2) + + def tearDown(self) -> None: + self.client.disconnect() + self.client.destroy() + + def test_plc_stop(self) -> None: + """plc_stop should succeed and set the server CPU state to STOP.""" + result = self.client.plc_stop() + self.assertEqual(result, 0) + + def test_plc_hot_start(self) -> None: + """plc_hot_start should succeed.""" + result = self.client.plc_hot_start() + self.assertEqual(result, 0) + + def test_plc_cold_start(self) -> None: + """plc_cold_start should succeed.""" + result = self.client.plc_cold_start() + self.assertEqual(result, 0) + + def test_plc_stop_then_start(self) -> None: + """Stopping then starting the PLC should work in sequence.""" + self.assertEqual(self.client.plc_stop(), 0) + self.assertEqual(self.client.plc_hot_start(), 0) + + def test_compress(self) -> None: + """compress should succeed.""" + result = self.client.compress(timeout=1000) + self.assertEqual(result, 0) + + def test_copy_ram_to_rom(self) -> None: + """copy_ram_to_rom should succeed.""" + result = self.client.copy_ram_to_rom(timeout=1000) + self.assertEqual(result, 0) + + +@pytest.mark.server +class TestServerErrorScenarios(unittest.TestCase): + """Test error handling paths in the server.""" + + server: Server = None # type: ignore + + @classmethod + def setUpClass(cls) -> None: + cls.server = Server() + # Only register DB1 with a small area + cls.server.register_area(SrvArea.DB, 1, bytearray(10)) + cls.server.start(tcp_port=SERVER_PORT + 3) + + @classmethod + def tearDownClass(cls) -> None: + if cls.server: + cls.server.stop() + cls.server.destroy() + + def setUp(self) -> None: + self.client = Client() + self.client.connect(ip, 0, 1, SERVER_PORT + 3) + + def tearDown(self) -> None: + self.client.disconnect() + self.client.destroy() + + def test_read_unregistered_db(self) -> None: + """Reading from an unregistered DB should still return data (server returns dummy data).""" + # The server returns dummy data for unregistered areas rather than an error + data = self.client.db_read(99, 0, 4) + self.assertEqual(len(data), 4) + + def test_write_beyond_area_bounds(self) -> None: + """Writing beyond area bounds should raise an error.""" + # DB1 is only 10 bytes, writing 20 bytes at offset 0 should fail + with self.assertRaises(Exception): + self.client.db_write(1, 0, bytearray(20)) + + def test_get_block_info_nonexistent(self) -> None: + """get_block_info for a non-existent block should raise an error.""" + with self.assertRaises(Exception): + self.client.get_block_info(Block.DB, 999) + + def test_upload_nonexistent_block(self) -> None: + """Uploading a non-existent block returns empty data (server has no data for that block).""" + # The server defaults to block_num=1 for unknown blocks due to parsing fallback, + # so the upload still completes but returns the default block's data. + # We just verify the operation doesn't crash. + data = self.client.upload(999) + self.assertIsInstance(data, bytearray) + + +if __name__ == "__main__": unittest.main() diff --git a/tests/test_server_coverage.py b/tests/test_server_coverage.py deleted file mode 100644 index 27e1e49c..00000000 --- a/tests/test_server_coverage.py +++ /dev/null @@ -1,375 +0,0 @@ -"""Integration tests for server block operations, USERDATA handlers, and PLC control. - -These tests exercise the server-side handlers that are not covered by the existing -test_server.py (which only tests the server API) or test_client.py (which focuses -on client-side logic). The goal is to improve coverage for snap7/server/__init__.py -from ~74% to ~85%+ by driving traffic through the protocol handlers. -""" - -import logging - -import pytest -import unittest -from datetime import datetime - -from snap7.client import Client -from snap7.server import Server -from snap7.type import SrvArea, Block - -logging.basicConfig(level=logging.WARNING) - -ip = "127.0.0.1" -SERVER_PORT = 12200 - - -@pytest.mark.server -class TestServerBlockOperations(unittest.TestCase): - """Test block operations through client-server communication.""" - - server: Server = None # type: ignore - - @classmethod - def setUpClass(cls) -> None: - cls.server = Server() - # Register several DBs so list_blocks / list_blocks_of_type have something to report - cls.server.register_area(SrvArea.DB, 1, bytearray(100)) - cls.server.register_area(SrvArea.DB, 2, bytearray(200)) - cls.server.register_area(SrvArea.DB, 3, bytearray(50)) - # Also register other area types - cls.server.register_area(SrvArea.MK, 0, bytearray(64)) - cls.server.register_area(SrvArea.PA, 0, bytearray(64)) - cls.server.register_area(SrvArea.PE, 0, bytearray(64)) - cls.server.register_area(SrvArea.TM, 0, bytearray(64)) - cls.server.register_area(SrvArea.CT, 0, bytearray(64)) - cls.server.start(tcp_port=SERVER_PORT) - - @classmethod - def tearDownClass(cls) -> None: - if cls.server: - cls.server.stop() - cls.server.destroy() - - def setUp(self) -> None: - self.client = Client() - self.client.connect(ip, 0, 1, SERVER_PORT) - - def tearDown(self) -> None: - self.client.disconnect() - self.client.destroy() - - # ------------------------------------------------------------------ - # list_blocks - # ------------------------------------------------------------------ - def test_list_blocks(self) -> None: - """list_blocks() should return counts; DBCount >= 3 since we registered 3 DBs.""" - bl = self.client.list_blocks() - self.assertGreaterEqual(bl.DBCount, 3) - # OB/FB/FC should be 0 since the emulator only tracks DBs - self.assertEqual(bl.OBCount, 0) - self.assertEqual(bl.FBCount, 0) - self.assertEqual(bl.FCCount, 0) - - # ------------------------------------------------------------------ - # list_blocks_of_type - # ------------------------------------------------------------------ - def test_list_blocks_of_type_db(self) -> None: - """list_blocks_of_type(DB) should include the DB numbers we registered.""" - block_nums = self.client.list_blocks_of_type(Block.DB, 100) - self.assertIn(1, block_nums) - self.assertIn(2, block_nums) - self.assertIn(3, block_nums) - - def test_list_blocks_of_type_ob(self) -> None: - """list_blocks_of_type(OB) should return an empty list (no OBs registered).""" - block_nums = self.client.list_blocks_of_type(Block.OB, 100) - self.assertEqual(block_nums, []) - - # ------------------------------------------------------------------ - # get_block_info - # ------------------------------------------------------------------ - def test_get_block_info(self) -> None: - """get_block_info for a registered DB should return valid metadata.""" - info = self.client.get_block_info(Block.DB, 1) - self.assertEqual(info.MC7Size, 100) # matches registered size - self.assertEqual(info.BlkNumber, 1) - - def test_get_block_info_db2(self) -> None: - """get_block_info for DB2 with size 200.""" - info = self.client.get_block_info(Block.DB, 2) - self.assertEqual(info.MC7Size, 200) - self.assertEqual(info.BlkNumber, 2) - - # ------------------------------------------------------------------ - # upload (block transfer: START_UPLOAD -> UPLOAD -> END_UPLOAD) - # ------------------------------------------------------------------ - def test_upload(self) -> None: - """Upload a DB from the server and verify the returned data length.""" - # Write known data to DB1 first - test_data = bytearray(range(10)) - self.client.db_write(1, 0, test_data) - - # Upload the block - block_data = self.client.upload(1) - self.assertGreater(len(block_data), 0) - # Verify the first bytes match what we wrote - self.assertEqual(block_data[:10], test_data) - - def test_full_upload(self) -> None: - """full_upload should return block data and its size.""" - data, size = self.client.full_upload(Block.DB, 1) - self.assertGreater(size, 0) - self.assertEqual(len(data), size) - - # ------------------------------------------------------------------ - # download (block transfer: REQUEST_DOWNLOAD -> DOWNLOAD_BLOCK -> DOWNLOAD_ENDED) - # ------------------------------------------------------------------ - def test_download(self) -> None: - """Download data to a registered DB on the server.""" - download_data = bytearray([0xAA, 0xBB, 0xCC, 0xDD]) - result = self.client.download(download_data, block_num=1) - self.assertEqual(result, 0) - - # Verify the data was written by reading it back - read_back = self.client.db_read(1, 0, 4) - self.assertEqual(read_back, download_data) - - -@pytest.mark.server -class TestServerUserdataOperations(unittest.TestCase): - """Test USERDATA handlers (SZL, clock, CPU state) through client-server communication.""" - - server: Server = None # type: ignore - - @classmethod - def setUpClass(cls) -> None: - cls.server = Server() - cls.server.register_area(SrvArea.DB, 1, bytearray(100)) - cls.server.start(tcp_port=SERVER_PORT + 1) - - @classmethod - def tearDownClass(cls) -> None: - if cls.server: - cls.server.stop() - cls.server.destroy() - - def setUp(self) -> None: - self.client = Client() - self.client.connect(ip, 0, 1, SERVER_PORT + 1) - - def tearDown(self) -> None: - self.client.disconnect() - self.client.destroy() - - # ------------------------------------------------------------------ - # read_szl - # ------------------------------------------------------------------ - def test_read_szl_0x001c(self) -> None: - """read_szl(0x001C) should return component identification data.""" - szl = self.client.read_szl(0x001C, 0) - self.assertGreater(szl.Header.LengthDR, 0) - - def test_read_szl_0x0011(self) -> None: - """read_szl(0x0011) should return module identification data.""" - szl = self.client.read_szl(0x0011, 0) - self.assertGreater(szl.Header.LengthDR, 0) - - def test_read_szl_0x0131(self) -> None: - """read_szl(0x0131) should return communication parameters.""" - szl = self.client.read_szl(0x0131, 0) - self.assertGreater(szl.Header.LengthDR, 0) - - def test_read_szl_0x0232(self) -> None: - """read_szl(0x0232) should return protection level data.""" - szl = self.client.read_szl(0x0232, 0) - self.assertGreater(szl.Header.LengthDR, 0) - - def test_read_szl_0x0000(self) -> None: - """read_szl(0x0000) should return the list of available SZL IDs.""" - szl = self.client.read_szl(0x0000, 0) - self.assertGreater(szl.Header.LengthDR, 0) - - def test_read_szl_list(self) -> None: - """read_szl_list should return raw bytes of available SZL IDs.""" - data = self.client.read_szl_list() - self.assertIsInstance(data, bytes) - self.assertGreater(len(data), 0) - - # ------------------------------------------------------------------ - # get_cpu_info (uses read_szl 0x001C internally) - # ------------------------------------------------------------------ - def test_get_cpu_info(self) -> None: - """get_cpu_info should populate the S7CpuInfo structure.""" - info = self.client.get_cpu_info() - # The emulated server returns "CPU 315-2 PN/DP" - self.assertIn(b"CPU", info.ModuleTypeName) - - # ------------------------------------------------------------------ - # get_order_code (uses read_szl 0x0011 internally) - # ------------------------------------------------------------------ - def test_get_order_code(self) -> None: - """get_order_code should return order code data.""" - oc = self.client.get_order_code() - self.assertIn(b"6ES7", oc.OrderCode) - - # ------------------------------------------------------------------ - # get_cp_info (uses read_szl 0x0131 internally) - # ------------------------------------------------------------------ - def test_get_cp_info(self) -> None: - """get_cp_info should return communication parameters.""" - cp = self.client.get_cp_info() - self.assertGreater(cp.MaxPduLength, 0) - self.assertGreater(cp.MaxConnections, 0) - - # ------------------------------------------------------------------ - # get_protection (uses read_szl 0x0232 internally) - # ------------------------------------------------------------------ - def test_get_protection(self) -> None: - """get_protection should return protection settings.""" - prot = self.client.get_protection() - # Emulator returns no protection (sch_schal=1) - self.assertEqual(prot.sch_schal, 1) - - # ------------------------------------------------------------------ - # get/set PLC datetime (clock USERDATA handlers) - # ------------------------------------------------------------------ - def test_get_plc_datetime(self) -> None: - """get_plc_datetime should return a valid datetime object.""" - dt = self.client.get_plc_datetime() - self.assertIsInstance(dt, datetime) - # Should be recent (within last minute) - now = datetime.now() - delta = abs((now - dt).total_seconds()) - self.assertLess(delta, 60) - - def test_set_plc_datetime(self) -> None: - """set_plc_datetime should succeed (returns 0).""" - test_dt = datetime(2025, 6, 15, 12, 30, 45) - result = self.client.set_plc_datetime(test_dt) - self.assertEqual(result, 0) - - def test_set_plc_system_datetime(self) -> None: - """set_plc_system_datetime should succeed.""" - result = self.client.set_plc_system_datetime() - self.assertEqual(result, 0) - - # ------------------------------------------------------------------ - # get_cpu_state (SZL-based CPU state request) - # ------------------------------------------------------------------ - def test_get_cpu_state(self) -> None: - """get_cpu_state should return a string state.""" - state = self.client.get_cpu_state() - self.assertIsInstance(state, str) - - -@pytest.mark.server -class TestServerPLCControl(unittest.TestCase): - """Test PLC control operations (stop/start) through client-server communication.""" - - server: Server = None # type: ignore - - @classmethod - def setUpClass(cls) -> None: - cls.server = Server() - cls.server.register_area(SrvArea.DB, 1, bytearray(100)) - cls.server.start(tcp_port=SERVER_PORT + 2) - - @classmethod - def tearDownClass(cls) -> None: - if cls.server: - cls.server.stop() - cls.server.destroy() - - def setUp(self) -> None: - self.client = Client() - self.client.connect(ip, 0, 1, SERVER_PORT + 2) - - def tearDown(self) -> None: - self.client.disconnect() - self.client.destroy() - - def test_plc_stop(self) -> None: - """plc_stop should succeed and set the server CPU state to STOP.""" - result = self.client.plc_stop() - self.assertEqual(result, 0) - - def test_plc_hot_start(self) -> None: - """plc_hot_start should succeed.""" - result = self.client.plc_hot_start() - self.assertEqual(result, 0) - - def test_plc_cold_start(self) -> None: - """plc_cold_start should succeed.""" - result = self.client.plc_cold_start() - self.assertEqual(result, 0) - - def test_plc_stop_then_start(self) -> None: - """Stopping then starting the PLC should work in sequence.""" - self.assertEqual(self.client.plc_stop(), 0) - self.assertEqual(self.client.plc_hot_start(), 0) - - def test_compress(self) -> None: - """compress should succeed.""" - result = self.client.compress(timeout=1000) - self.assertEqual(result, 0) - - def test_copy_ram_to_rom(self) -> None: - """copy_ram_to_rom should succeed.""" - result = self.client.copy_ram_to_rom(timeout=1000) - self.assertEqual(result, 0) - - -@pytest.mark.server -class TestServerErrorScenarios(unittest.TestCase): - """Test error handling paths in the server.""" - - server: Server = None # type: ignore - - @classmethod - def setUpClass(cls) -> None: - cls.server = Server() - # Only register DB1 with a small area - cls.server.register_area(SrvArea.DB, 1, bytearray(10)) - cls.server.start(tcp_port=SERVER_PORT + 3) - - @classmethod - def tearDownClass(cls) -> None: - if cls.server: - cls.server.stop() - cls.server.destroy() - - def setUp(self) -> None: - self.client = Client() - self.client.connect(ip, 0, 1, SERVER_PORT + 3) - - def tearDown(self) -> None: - self.client.disconnect() - self.client.destroy() - - def test_read_unregistered_db(self) -> None: - """Reading from an unregistered DB should still return data (server returns dummy data).""" - # The server returns dummy data for unregistered areas rather than an error - data = self.client.db_read(99, 0, 4) - self.assertEqual(len(data), 4) - - def test_write_beyond_area_bounds(self) -> None: - """Writing beyond area bounds should raise an error.""" - # DB1 is only 10 bytes, writing 20 bytes at offset 0 should fail - with self.assertRaises(Exception): - self.client.db_write(1, 0, bytearray(20)) - - def test_get_block_info_nonexistent(self) -> None: - """get_block_info for a non-existent block should raise an error.""" - with self.assertRaises(Exception): - self.client.get_block_info(Block.DB, 999) - - def test_upload_nonexistent_block(self) -> None: - """Uploading a non-existent block returns empty data (server has no data for that block).""" - # The server defaults to block_num=1 for unknown blocks due to parsing fallback, - # so the upload still completes but returns the default block's data. - # We just verify the operation doesn't crash. - data = self.client.upload(999) - self.assertIsInstance(data, bytearray) - - -if __name__ == "__main__": - unittest.main() diff --git a/tests/test_util.py b/tests/test_util.py index b541cfc2..49f3d192 100644 --- a/tests/test_util.py +++ b/tests/test_util.py @@ -1,13 +1,16 @@ import datetime +import logging import pytest import unittest import struct from typing import cast +from unittest.mock import MagicMock from snap7 import DB, Row +from snap7.type import Area, WordLen from snap7.util import get_byte, get_time, get_fstring, get_int from snap7.util import set_byte, set_time, set_fstring, set_int -from snap7.type import WordLen +from snap7.util.db import print_row test_spec = """ @@ -936,5 +939,540 @@ def test_set_time_memoryview(self) -> None: self.assertNotEqual(buf, bytearray(4)) +_db_test_spec = """ +4 ID INT +6 NAME STRING[4] + +12.0 testbool1 BOOL +12.1 testbool2 BOOL +13 testReal REAL +17 testDword DWORD +21 testint2 INT +23 testDint DINT +27 testWord WORD +29 testS5time S5TIME +31 testdateandtime DATE_AND_TIME +43 testusint0 USINT +44 testsint0 SINT +46 testTime TIME +50 testByte BYTE +51 testUint UINT +53 testUdint UDINT +57 testLreal LREAL +65 testChar CHAR +66 testWchar WCHAR +68 testWstring WSTRING[4] +80 testDate DATE +82 testTod TOD +86 testDtl DTL +98 testFstring FSTRING[8] +""" + +_db_bytearray = bytearray( + [ + 0, + 0, # test int + 4, + 4, + ord("t"), + ord("e"), + ord("s"), + ord("t"), # test string + 0x0F, # test bools + 68, + 78, + 211, + 51, # test real + 255, + 255, + 255, + 255, # test dword + 0, + 0, # test int 2 + 128, + 0, + 0, + 0, # test dint + 255, + 255, # test word + 0, + 16, # test s5time + 32, + 7, + 18, + 23, + 50, + 2, + 133, + 65, # date_and_time (8 bytes) + 254, + 254, + 254, + 254, + 254, # padding + 127, # usint + 128, # sint + 143, + 255, + 255, + 255, # time + 254, # byte + 48, + 57, # uint + 7, + 91, + 205, + 21, # udint + 65, + 157, + 111, + 52, + 84, + 126, + 107, + 117, # lreal + 65, # char 'A' + 3, + 169, # wchar + 0, + 4, + 0, + 4, + 3, + 169, + 0, + ord("s"), + 0, + ord("t"), + 0, + 196, # wstring + 45, + 235, # date + 2, + 179, + 41, + 128, # tod + 7, + 230, + 3, + 9, + 4, + 12, + 34, + 45, + 0, + 0, + 0, + 0, # dtl + 116, + 101, + 115, + 116, + 32, + 32, + 32, + 32, # fstring 'test ' + ] +) + + +class TestPrintRow: + def test_print_row_output(self, caplog: pytest.LogCaptureFixture) -> None: + data = bytearray([65, 66, 67, 68, 69]) + with caplog.at_level(logging.INFO, logger="snap7.util.db"): + print_row(data) + assert "65" in caplog.text + assert "A" in caplog.text + + +class TestDBDictInterface: + def setup_method(self) -> None: + test_array = bytearray(_db_bytearray * 3) + self.db = DB(1, test_array, _db_test_spec, row_size=len(_db_bytearray), size=3, layout_offset=4, db_offset=0) + + def test_len(self) -> None: + assert len(self.db) == 3 + + def test_getitem(self) -> None: + row = self.db["0"] + assert row is not None + + def test_getitem_missing(self) -> None: + row = self.db["999"] + assert row is None + + def test_contains(self) -> None: + assert "0" in self.db + assert "999" not in self.db + + def test_keys(self) -> None: + keys = list(self.db.keys()) + assert "0" in keys + assert len(keys) == 3 + + def test_items(self) -> None: + items = list(self.db.items()) + assert len(items) == 3 + for key, row in items: + assert isinstance(key, str) + assert isinstance(row, Row) + + def test_iter(self) -> None: + for key, row in self.db: + assert isinstance(key, str) + assert isinstance(row, Row) + + def test_get_bytearray(self) -> None: + ba = self.db.get_bytearray() + assert isinstance(ba, bytearray) + + +class TestDBWithIdField: + def test_id_field_creates_named_index(self) -> None: + test_array = bytearray(_db_bytearray * 2) + # Set different ID values for each row + struct.pack_into(">h", test_array, 0, 10) # row 0, ID at offset 0 (spec offset 4, layout_offset 4) + struct.pack_into(">h", test_array, len(_db_bytearray), 20) # row 1 + db = DB(1, test_array, _db_test_spec, row_size=len(_db_bytearray), size=2, id_field="ID", layout_offset=4, db_offset=0) + assert "10" in db + assert "20" in db + + +class TestDBSetData: + def test_set_data_valid(self) -> None: + test_array = bytearray(_db_bytearray) + db = DB(1, test_array, _db_test_spec, row_size=len(_db_bytearray), size=1, layout_offset=4, db_offset=0) + new_data = bytearray(len(_db_bytearray)) + db.set_data(new_data) + assert db.get_bytearray() is new_data + + def test_set_data_invalid_type(self) -> None: + test_array = bytearray(_db_bytearray) + db = DB(1, test_array, _db_test_spec, row_size=len(_db_bytearray), size=1, layout_offset=4, db_offset=0) + with pytest.raises(TypeError): + db.set_data(b"not a bytearray") # type: ignore[arg-type] + + +class TestDBReadWrite: + """Test DB.read() and DB.write() with mocked client.""" + + def test_read_db_area(self) -> None: + test_array = bytearray(_db_bytearray) + db = DB(1, test_array, _db_test_spec, row_size=len(_db_bytearray), size=1, layout_offset=4, db_offset=0) + mock_client = MagicMock() + mock_client.db_read.return_value = bytearray(len(_db_bytearray)) + db.read(mock_client) + mock_client.db_read.assert_called_once() + + def test_read_non_db_area(self) -> None: + test_array = bytearray(_db_bytearray) + db = DB(0, test_array, _db_test_spec, row_size=len(_db_bytearray), size=1, layout_offset=4, db_offset=0, area=Area.MK) + mock_client = MagicMock() + mock_client.read_area.return_value = bytearray(len(_db_bytearray)) + db.read(mock_client) + mock_client.read_area.assert_called_once() + + def test_read_negative_row_size(self) -> None: + test_array = bytearray(_db_bytearray) + db = DB(1, test_array, _db_test_spec, row_size=len(_db_bytearray), size=1, layout_offset=4, db_offset=0) + db.row_size = -1 + mock_client = MagicMock() + with pytest.raises(ValueError, match="row_size"): + db.read(mock_client) + + def test_write_db_area(self) -> None: + test_array = bytearray(_db_bytearray) + db = DB(1, test_array, _db_test_spec, row_size=len(_db_bytearray), size=1, layout_offset=4, db_offset=0) + mock_client = MagicMock() + db.write(mock_client) + mock_client.db_write.assert_called_once() + + def test_write_non_db_area(self) -> None: + test_array = bytearray(_db_bytearray) + db = DB(0, test_array, _db_test_spec, row_size=len(_db_bytearray), size=1, layout_offset=4, db_offset=0, area=Area.MK) + mock_client = MagicMock() + db.write(mock_client) + mock_client.write_area.assert_called_once() + + def test_write_negative_row_size(self) -> None: + test_array = bytearray(_db_bytearray) + db = DB(1, test_array, _db_test_spec, row_size=len(_db_bytearray), size=1, layout_offset=4, db_offset=0) + db.row_size = -1 + mock_client = MagicMock() + with pytest.raises(ValueError, match="row_size"): + db.write(mock_client) + + def test_write_with_row_offset(self) -> None: + test_array = bytearray(_db_bytearray * 2) + db = DB(1, test_array, _db_test_spec, row_size=len(_db_bytearray), size=2, layout_offset=4, db_offset=0, row_offset=4) + mock_client = MagicMock() + db.write(mock_client) + # Should write each row individually via Row.write() + assert mock_client.db_write.call_count == 2 + + +class TestRowRepr: + def test_repr(self) -> None: + test_array = bytearray(_db_bytearray) + row = Row(test_array, _db_test_spec, layout_offset=4) + r = repr(row) + assert "ID" in r + assert "NAME" in r + + +class TestRowUnchanged: + def test_unchanged_true(self) -> None: + test_array = bytearray(_db_bytearray) + row = Row(test_array, _db_test_spec, layout_offset=4) + assert row.unchanged(test_array) is True + + def test_unchanged_false(self) -> None: + test_array = bytearray(_db_bytearray) + row = Row(test_array, _db_test_spec, layout_offset=4) + other = bytearray(len(_db_bytearray)) + assert row.unchanged(other) is False + + +class TestRowTypeError: + def test_invalid_bytearray_type(self) -> None: + with pytest.raises(TypeError): + Row("not a bytearray", _db_test_spec) # type: ignore[arg-type] + + +class TestRowReadWrite: + """Test Row.read() and Row.write() with mocked client through DB parent.""" + + def test_row_write_db_area(self) -> None: + test_array = bytearray(_db_bytearray) + db = DB(1, test_array, _db_test_spec, row_size=len(_db_bytearray), size=1, layout_offset=4, db_offset=0) + row = db["0"] + assert row is not None + mock_client = MagicMock() + row.write(mock_client) + mock_client.db_write.assert_called_once() + + def test_row_write_non_db_area(self) -> None: + test_array = bytearray(_db_bytearray) + db = DB(0, test_array, _db_test_spec, row_size=len(_db_bytearray), size=1, layout_offset=4, db_offset=0, area=Area.MK) + row = db["0"] + assert row is not None + mock_client = MagicMock() + row.write(mock_client) + mock_client.write_area.assert_called_once() + + def test_row_write_not_db_parent(self) -> None: + test_array = bytearray(_db_bytearray) + row = Row(test_array, _db_test_spec, layout_offset=4) + mock_client = MagicMock() + with pytest.raises(TypeError): + row.write(mock_client) + + def test_row_write_negative_row_size(self) -> None: + test_array = bytearray(_db_bytearray) + db = DB(1, test_array, _db_test_spec, row_size=len(_db_bytearray), size=1, layout_offset=4, db_offset=0) + row = db["0"] + assert row is not None + row.row_size = -1 + mock_client = MagicMock() + with pytest.raises(ValueError, match="row_size"): + row.write(mock_client) + + def test_row_read_db_area(self) -> None: + test_array = bytearray(_db_bytearray) + db = DB(1, test_array, _db_test_spec, row_size=len(_db_bytearray), size=1, layout_offset=4, db_offset=0) + row = db["0"] + assert row is not None + mock_client = MagicMock() + mock_client.db_read.return_value = bytearray(len(_db_bytearray)) + row.read(mock_client) + mock_client.db_read.assert_called_once() + + def test_row_read_non_db_area(self) -> None: + test_array = bytearray(_db_bytearray) + db = DB(0, test_array, _db_test_spec, row_size=len(_db_bytearray), size=1, layout_offset=4, db_offset=0, area=Area.MK) + row = db["0"] + assert row is not None + mock_client = MagicMock() + mock_client.read_area.return_value = bytearray(len(_db_bytearray)) + row.read(mock_client) + mock_client.read_area.assert_called_once() + + def test_row_read_not_db_parent(self) -> None: + test_array = bytearray(_db_bytearray) + row = Row(test_array, _db_test_spec, layout_offset=4) + mock_client = MagicMock() + with pytest.raises(TypeError): + row.read(mock_client) + + def test_row_read_negative_row_size(self) -> None: + test_array = bytearray(_db_bytearray) + db = DB(1, test_array, _db_test_spec, row_size=len(_db_bytearray), size=1, layout_offset=4, db_offset=0) + row = db["0"] + assert row is not None + row.row_size = -1 + mock_client = MagicMock() + with pytest.raises(ValueError, match="row_size"): + row.read(mock_client) + + +class TestRowSetValueTypes: + """Test set_value for various type branches.""" + + def setup_method(self) -> None: + self.test_array = bytearray(_db_bytearray) + self.row = Row(self.test_array, _db_test_spec, layout_offset=4) + + def test_set_int(self) -> None: + self.row.set_value(4, "INT", 42) + assert self.row.get_value(4, "INT") == 42 + + def test_set_uint(self) -> None: + self.row.set_value(51, "UINT", 1000) + assert self.row.get_value(51, "UINT") == 1000 + + def test_set_dint(self) -> None: + self.row.set_value(23, "DINT", -100) + assert self.row.get_value(23, "DINT") == -100 + + def test_set_udint(self) -> None: + self.row.set_value(53, "UDINT", 999999) + assert self.row.get_value(53, "UDINT") == 999999 + + def test_set_word(self) -> None: + self.row.set_value(27, "WORD", 12345) + assert self.row.get_value(27, "WORD") == 12345 + + def test_set_usint(self) -> None: + self.row.set_value(43, "USINT", 200) + assert self.row.get_value(43, "USINT") == 200 + + def test_set_sint(self) -> None: + self.row.set_value(44, "SINT", -50) + assert self.row.get_value(44, "SINT") == -50 + + def test_set_time(self) -> None: + self.row.set_value(46, "TIME", "1:2:3:4.5") + assert self.row.get_value(46, "TIME") is not None + + def test_set_date(self) -> None: + d = datetime.date(2024, 1, 15) + self.row.set_value(80, "DATE", d) + assert self.row.get_value(80, "DATE") == d + + def test_set_tod(self) -> None: + td = datetime.timedelta(hours=5, minutes=30) + self.row.set_value(82, "TOD", td) + assert self.row.get_value(82, "TOD") == td + + def test_set_time_of_day(self) -> None: + td = datetime.timedelta(hours=1) + self.row.set_value(82, "TIME_OF_DAY", td) + assert self.row.get_value(82, "TIME_OF_DAY") == td + + def test_set_dtl(self) -> None: + dt = datetime.datetime(2024, 6, 15, 10, 20, 30) + self.row.set_value(86, "DTL", dt) + result = self.row.get_value(86, "DTL") + assert result.year == 2024 # type: ignore[union-attr] + + def test_set_date_and_time(self) -> None: + dt = datetime.datetime(2020, 7, 12, 17, 32, 2, 854000) + self.row.set_value(31, "DATE_AND_TIME", dt) + result = self.row.get_value(31, "DATE_AND_TIME") + assert "2020" in str(result) + + def test_set_unknown_type_raises(self) -> None: + with pytest.raises(ValueError): + self.row.set_value(4, "UNKNOWN_TYPE", 42) + + def test_set_string(self) -> None: + self.row.set_value(6, "STRING[4]", "ab") + assert self.row.get_value(6, "STRING[4]") == "ab" + + def test_set_wstring(self) -> None: + self.row.set_value(68, "WSTRING[4]", "ab") + assert self.row.get_value(68, "WSTRING[4]") == "ab" + + def test_set_fstring(self) -> None: + self.row.set_value(98, "FSTRING[8]", "hi") + assert self.row.get_value(98, "FSTRING[8]") == "hi" + + def test_set_real(self) -> None: + self.row.set_value(13, "REAL", 3.14) + assert abs(self.row.get_value(13, "REAL") - 3.14) < 0.01 # type: ignore[operator] + + def test_set_lreal(self) -> None: + self.row.set_value(57, "LREAL", 2.718281828) + assert abs(self.row.get_value(57, "LREAL") - 2.718281828) < 0.0001 # type: ignore[operator] + + def test_set_char(self) -> None: + self.row.set_value(65, "CHAR", "Z") + assert self.row.get_value(65, "CHAR") == "Z" + + def test_set_wchar(self) -> None: + self.row.set_value(66, "WCHAR", "W") + assert self.row.get_value(66, "WCHAR") == "W" + + +class TestRowGetValueEdgeCases: + """Test get_value for edge cases.""" + + def setup_method(self) -> None: + self.test_array = bytearray(_db_bytearray) + self.row = Row(self.test_array, _db_test_spec, layout_offset=4) + + def test_unknown_type_raises(self) -> None: + with pytest.raises(ValueError): + self.row.get_value(4, "NONEXISTENT") + + def test_string_no_max_size(self) -> None: + spec = "4 test STRING" + row = Row(bytearray(20), spec, layout_offset=0) + with pytest.raises(ValueError, match="Max size"): + row.get_value(4, "STRING") + + def test_fstring_no_max_size(self) -> None: + with pytest.raises(ValueError, match="Max size"): + self.row.get_value(98, "FSTRING") + + def test_wstring_no_max_size(self) -> None: + with pytest.raises(ValueError, match="Max size"): + self.row.get_value(68, "WSTRING") + + +class TestRowSetValueEdgeCases: + """Test set_value edge cases for string types.""" + + def setup_method(self) -> None: + self.test_array = bytearray(_db_bytearray) + self.row = Row(self.test_array, _db_test_spec, layout_offset=4) + + def test_fstring_no_max_size(self) -> None: + with pytest.raises(ValueError, match="Max size"): + self.row.set_value(98, "FSTRING", "test") + + def test_string_no_max_size(self) -> None: + with pytest.raises(ValueError, match="Max size"): + self.row.set_value(6, "STRING", "test") + + def test_wstring_no_max_size(self) -> None: + with pytest.raises(ValueError, match="Max size"): + self.row.set_value(68, "WSTRING", "test") + + +class TestRowWriteWithRowOffset: + """Test Row.write() with row_offset set.""" + + def test_write_with_row_offset(self) -> None: + test_array = bytearray(_db_bytearray) + db = DB(1, test_array, _db_test_spec, row_size=len(_db_bytearray), size=1, layout_offset=4, db_offset=0, row_offset=10) + row = db["0"] + assert row is not None + mock_client = MagicMock() + row.write(mock_client) + # The data written should start at db_offset + row_offset + mock_client.db_write.assert_called_once() + + if __name__ == "__main__": unittest.main() From 76acf912b35fb0cb2eb3fe69d00bae8828de6bf6 Mon Sep 17 00:00:00 2001 From: Gijs Molenaar Date: Fri, 20 Mar 2026 16:31:07 +0200 Subject: [PATCH 18/19] Restructure docs into logical sections (#649) * Cleanup: consolidate tests, fix docs, remove README async section README: - Remove async support section (unnecessary on landing page) Documentation: - Add S7CommPlus API docs with experimental warning - Add experimental warning to AsyncClient docs - Update PLC support matrix for S7CommPlus V1/V2 status Test consolidation (no test logic changed): - Merge test_server_coverage.py into test_server.py - Merge test_partner_coverage.py into test_partner.py - Merge test_logo_coverage.py into test_logo_client.py - Merge test_db_coverage.py into test_util.py - Rename test_s7protocol_coverage.py to test_s7protocol.py Mypy fixes: - Widen Row.set_value type to accept date/datetime/timedelta - Add type annotations in test_s7protocol.py, test_partner.py, test_connection.py, test_async_client.py Co-Authored-By: Claude Opus 4.6 * Fix ruff formatting in test_util.py Co-Authored-By: Claude Opus 4.6 * Improve S7CommPlus test coverage and fix Codecov upload Add 154 new unit tests covering codec decoders, PValue parsing for all data types, payload builders/parsers, connection response parsing, and client error paths. S7CommPlus coverage rises from 77% to 87%, with codec.py reaching 100%. Also add CODECOV_TOKEN to the workflow to fix silent upload failures on protected branches. Co-Authored-By: Claude Opus 4.6 * Restructure docs into logical sections Split the monolithic examples.rst and troubleshooting.rst into focused, topic-based pages and group them under clear sections in the toctree: Getting Started, User Guide, Troubleshooting, Development, API Reference. Co-Authored-By: Claude Opus 4.6 --------- Co-authored-by: Claude Opus 4.6 --- doc/connecting.rst | 100 ++++++++ doc/connection-issues.rst | 106 ++++++++ doc/error-reference.rst | 50 ++++ doc/index.rst | 34 ++- doc/limitations.rst | 28 +++ doc/multi-variable.rst | 51 ++++ doc/plc-support.rst | 8 +- doc/{examples.rst => reading-writing.rst} | 275 +-------------------- doc/server.rst | 113 +++++++++ doc/thread-safety.rst | 39 +++ doc/tia-portal-config.rst | 56 +++++ doc/troubleshooting.rst | 283 ---------------------- 12 files changed, 587 insertions(+), 556 deletions(-) create mode 100644 doc/connecting.rst create mode 100644 doc/connection-issues.rst create mode 100644 doc/error-reference.rst create mode 100644 doc/limitations.rst create mode 100644 doc/multi-variable.rst rename doc/{examples.rst => reading-writing.rst} (61%) create mode 100644 doc/server.rst create mode 100644 doc/thread-safety.rst create mode 100644 doc/tia-portal-config.rst delete mode 100644 doc/troubleshooting.rst diff --git a/doc/connecting.rst b/doc/connecting.rst new file mode 100644 index 00000000..8eefe4a6 --- /dev/null +++ b/doc/connecting.rst @@ -0,0 +1,100 @@ +Connecting to PLCs +================== + +This page shows how to connect to different Siemens PLC models using +python-snap7. + +.. contents:: On this page + :local: + :depth: 2 + + +Rack/Slot Reference +------------------- + +.. list-table:: + :header-rows: 1 + :widths: 20 10 10 60 + + * - PLC Model + - Rack + - Slot + - Notes + * - S7-300 + - 0 + - 2 + - + * - S7-400 + - 0 + - 3 + - May vary with multi-rack configurations + * - S7-1200 + - 0 + - 1 + - PUT/GET access must be enabled in TIA Portal + * - S7-1500 + - 0 + - 1 + - PUT/GET access must be enabled in TIA Portal + * - S7-200 / Logo + - -- + - -- + - Use ``set_connection_params`` with TSAP addressing + +.. warning:: + + S7-1200 and S7-1500 PLCs ship with PUT/GET communication disabled by + default. Enable it in TIA Portal under the CPU properties before + connecting. See :doc:`tia-portal-config` for step-by-step instructions. + + +S7-300 +------ + +.. code-block:: python + + import snap7 + + client = snap7.Client() + client.connect("192.168.1.10", 0, 2) + +S7-400 +------ + +.. code-block:: python + + import snap7 + + client = snap7.Client() + client.connect("192.168.1.10", 0, 3) + +S7-1200 / S7-1500 +------------------ + +.. code-block:: python + + import snap7 + + client = snap7.Client() + client.connect("192.168.1.10", 0, 1) + +S7-200 / Logo (TSAP Connection) +-------------------------------- + +.. code-block:: python + + import snap7 + + client = snap7.Client() + client.set_connection_params("192.168.1.10", 0x1000, 0x2000) + client.connect("192.168.1.10", 0, 0) + +Using a Non-Standard Port +-------------------------- + +.. code-block:: python + + import snap7 + + client = snap7.Client() + client.connect("192.168.1.10", 0, 1, tcp_port=1102) diff --git a/doc/connection-issues.rst b/doc/connection-issues.rst new file mode 100644 index 00000000..95008553 --- /dev/null +++ b/doc/connection-issues.rst @@ -0,0 +1,106 @@ +Connection Issues +================= + +.. contents:: On this page + :local: + :depth: 2 + + +.. _connection-recovery: + +Connection Recovery +------------------- + +Network connections to PLCs can drop due to cable issues, PLC restarts, or +network problems. Use a reconnection pattern to handle this gracefully: + +.. code-block:: python + + import snap7 + import time + import logging + + logger = logging.getLogger(__name__) + + client = snap7.Client() + + def connect(address: str = "192.168.1.10", rack: int = 0, slot: int = 1) -> None: + client.connect(address, rack, slot) + + def safe_read(db: int, start: int, size: int) -> bytearray: + """Read from DB with automatic reconnection on failure.""" + try: + return client.db_read(db, start, size) + except Exception: + logger.warning("Read failed, attempting reconnection...") + try: + client.disconnect() + except Exception: + pass + time.sleep(1) + connect() + return client.db_read(db, start, size) + + def safe_write(db: int, start: int, data: bytearray) -> None: + """Write to DB with automatic reconnection on failure.""" + try: + client.db_write(db, start, data) + except Exception: + logger.warning("Write failed, attempting reconnection...") + try: + client.disconnect() + except Exception: + pass + time.sleep(1) + connect() + client.db_write(db, start, data) + +For long-running applications, wrap your main loop with reconnection logic: + +.. code-block:: python + + while True: + try: + data = safe_read(1, 0, 10) + # process data... + time.sleep(0.5) + except Exception: + logger.error("Failed after reconnection attempt, retrying in 5s...") + time.sleep(5) + + +Connection Timeout +------------------ + +The default connection timeout is 5 seconds. You can configure it by accessing +the underlying connection object: + +.. code-block:: python + + import snap7 + + client = snap7.Client() + + # Connect with a custom timeout (in seconds) + client.connect("192.168.1.10", 0, 1) + + # The timeout is set on the underlying connection + # Default is 5.0 seconds + client.connection.timeout = 10.0 # Set to 10 seconds + +To set the timeout **before** connecting, use ``set_connection_params`` and then +connect manually, or simply reconnect after adjusting: + +.. code-block:: python + + client = snap7.Client() + client.connect("192.168.1.10", 0, 1) + + # Adjust timeout for slow networks + client.connection.timeout = 15.0 + +.. note:: + + If you are experiencing frequent timeouts, check your network quality first. + Typical S7 communication on a local network should respond within + milliseconds. diff --git a/doc/error-reference.rst b/doc/error-reference.rst new file mode 100644 index 00000000..812b28f2 --- /dev/null +++ b/doc/error-reference.rst @@ -0,0 +1,50 @@ +Error Message Reference +======================= + +The following table maps common S7 error strings to their likely cause and fix. + +.. list-table:: + :header-rows: 1 + :widths: 35 30 35 + + * - Error message + - Likely cause + - Fix + * - ``CLI : function refused by CPU (Unknown error)`` + - PUT/GET communication is not enabled on the PLC, or the data block + still has optimized block access enabled. + - Enable PUT/GET in TIA Portal and disable optimized block access on each + DB. See :doc:`tia-portal-config`. + * - ``CPU : Function not available`` + - The requested function is not supported on this PLC model. S7-1200 and + S7-1500 PLCs restrict certain operations. + - Check Siemens documentation for your PLC model. Some functions are only + available on S7-300/400. + * - ``CPU : Item not available`` + - Wrong DB number, the DB does not exist, or the address is out of range. + - Verify the DB number exists on the PLC and that the offset and size are + within bounds. + * - ``CPU : Address out of range`` + - Reading or writing past the end of a DB or memory area. + - Check the DB size in TIA Portal and ensure ``start + size`` does not + exceed it. + * - ``CPU : Function not authorized for current protection level`` + - The PLC has password protection enabled. + - Remove or lower the protection level in TIA Portal under + Protection & Security. + * - ``ISO : An error occurred during recv TCP : Connection timed out`` + - Network issue: PLC is unreachable, a firewall is blocking port 102, or + the PLC is not responding. + - Check network connectivity (``ping``), verify firewall rules, and ensure + the PLC is powered on and reachable. + * - ``ISO : An error occurred during send TCP : Connection timed out`` + - Same as above. + - Same as above. + * - ``TCP : Unreachable peer`` + - The PLC is not reachable on the network. + - Verify IP address, subnet, and routing. Ensure the PLC Ethernet port is + connected and configured. + * - ``TCP : Connection reset`` / Socket error 32 (broken pipe) + - The connection to the PLC was lost unexpectedly. + - The PLC may have been restarted, the cable disconnected, or another + client took over the connection. See :doc:`connection-issues`. diff --git a/doc/index.rst b/doc/index.rst index 8066c63d..cade988c 100644 --- a/doc/index.rst +++ b/doc/index.rst @@ -1,18 +1,43 @@ Welcome to python-snap7's documentation! ======================================== -Contents: - .. toctree:: :maxdepth: 2 + :caption: Getting Started introduction installation plc-support - examples - troubleshooting + +.. toctree:: + :maxdepth: 2 + :caption: User Guide + + connecting + reading-writing + multi-variable + server + tia-portal-config + +.. toctree:: + :maxdepth: 2 + :caption: Troubleshooting + + error-reference + connection-issues + thread-safety + limitations + +.. toctree:: + :maxdepth: 2 + :caption: Development + development +.. toctree:: + :maxdepth: 2 + :caption: API Reference + API/client API/async_client API/s7commplus @@ -26,7 +51,6 @@ Contents: API/datatypes - Indices and tables ================== diff --git a/doc/limitations.rst b/doc/limitations.rst new file mode 100644 index 00000000..26f82c5a --- /dev/null +++ b/doc/limitations.rst @@ -0,0 +1,28 @@ +Protocol Limitations and FAQ +============================ + +python-snap7 implements the S7 protocol over TCP/IP. The following operations +are **not possible** with this protocol: + +.. list-table:: + :header-rows: 1 + :widths: 40 60 + + * - Limitation + - Explanation + * - Read tag/symbol names from PLC + - Symbol names exist only in the TIA Portal project file, not in the PLC. + The S7 protocol only addresses data by area, DB number, and byte offset. + * - Get DB structure or layout from PLC + - The PLC stores only raw bytes. The structure definition lives in the TIA + Portal project. You must define your data layout in your Python code. + * - Discover PLCs on the network + - There is no S7 broadcast discovery mechanism. You must know the PLC's IP + address. + * - Create PLC backups + - Full project backup requires TIA Portal. python-snap7 can upload + individual blocks, but this is not a complete backup. + * - Access S7-1200/1500 PLCs with S7CommPlus security + - PLCs configured to require S7CommPlus encrypted communication cannot be + accessed with the classic S7 protocol. PUT/GET must be enabled as a + fallback. diff --git a/doc/multi-variable.rst b/doc/multi-variable.rst new file mode 100644 index 00000000..b83f35c3 --- /dev/null +++ b/doc/multi-variable.rst @@ -0,0 +1,51 @@ +Multi-Variable Read +=================== + +The ``read_multi_vars`` method reads multiple variables in a single PDU +request, which is significantly faster than individual reads. + +.. code-block:: python + + import snap7 + from snap7.type import Area, WordLen, S7DataItem + from ctypes import c_uint8, cast, POINTER + + client = snap7.Client() + client.connect("192.168.1.10", 0, 1) + + # Prepare items to read + items = [] + + # Item 1: 4 bytes from DB1, offset 0 + item1 = S7DataItem() + item1.Area = Area.DB + item1.WordLen = WordLen.Byte + item1.DBNumber = 1 + item1.Start = 0 + item1.Amount = 4 + buffer1 = (c_uint8 * 4)() + item1.pData = cast(buffer1, POINTER(c_uint8)) + items.append(item1) + + # Item 2: 2 bytes from DB2, offset 10 + item2 = S7DataItem() + item2.Area = Area.DB + item2.WordLen = WordLen.Byte + item2.DBNumber = 2 + item2.Start = 10 + item2.Amount = 2 + buffer2 = (c_uint8 * 2)() + item2.pData = cast(buffer2, POINTER(c_uint8)) + items.append(item2) + + # Execute the multi-read + result, data_items = client.read_multi_vars(items) + + # Access the returned data + value1 = bytearray(buffer1) + value2 = bytearray(buffer2) + +.. warning:: + + The S7 protocol limits multi-variable reads to **20 items** per request. + If you need more, split them across multiple calls. diff --git a/doc/plc-support.rst b/doc/plc-support.rst index dfc1cda6..281459ce 100644 --- a/doc/plc-support.rst +++ b/doc/plc-support.rst @@ -101,12 +101,8 @@ Enabling PUT/GET Access ----------------------- For S7-1200 and S7-1500 PLCs, classic S7 protocol access requires the -**PUT/GET** option to be enabled: - -1. Open TIA Portal and go to the PLC properties. -2. Navigate to **Protection & Security** → **Connection mechanisms**. -3. Check **Permit access with PUT/GET communication from remote partner**. -4. Download the configuration to the PLC. +**PUT/GET** option to be enabled. See :doc:`tia-portal-config` for +step-by-step instructions. .. warning:: diff --git a/doc/examples.rst b/doc/reading-writing.rst similarity index 61% rename from doc/examples.rst rename to doc/reading-writing.rst index dd4d713a..cea8f14d 100644 --- a/doc/examples.rst +++ b/doc/reading-writing.rst @@ -1,77 +1,10 @@ -Examples & Cookbook -=================== +Reading & Writing Data +====================== -This page provides practical examples for common python-snap7 tasks. All code -assumes you have already installed python-snap7: +This page covers address mapping, data type conversions, memory area access, +and analog I/O — everything you need for reading from and writing to a PLC. -.. code-block:: bash - - pip install python-snap7 - - -Connecting to Different PLC Models ------------------------------------ - -Rack/Slot Reference -^^^^^^^^^^^^^^^^^^^ - -.. list-table:: - :header-rows: 1 - :widths: 20 10 10 60 - - * - PLC Model - - Rack - - Slot - - Notes - * - S7-300 - - 0 - - 2 - - - * - S7-400 - - 0 - - 3 - - May vary with multi-rack configurations - * - S7-1200 - - 0 - - 1 - - PUT/GET access must be enabled in TIA Portal - * - S7-1500 - - 0 - - 1 - - PUT/GET access must be enabled in TIA Portal - * - S7-200 / Logo - - -- - - -- - - Use ``set_connection_params`` with TSAP addressing - -.. warning:: - - S7-1200 and S7-1500 PLCs ship with PUT/GET communication disabled by - default. Enable it in TIA Portal under the CPU properties before - connecting. - -S7-300 -^^^^^^ - -.. code-block:: python - - import snap7 - - client = snap7.Client() - client.connect("192.168.1.10", 0, 2) - -S7-400 -^^^^^^ - -.. code-block:: python - - import snap7 - - client = snap7.Client() - client.connect("192.168.1.10", 0, 3) - -S7-1200 / S7-1500 -^^^^^^^^^^^^^^^^^^ +All examples assume you have a connected client: .. code-block:: python @@ -80,30 +13,13 @@ S7-1200 / S7-1500 client = snap7.Client() client.connect("192.168.1.10", 0, 1) -S7-200 / Logo (TSAP Connection) -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -.. code-block:: python - - import snap7 - - client = snap7.Client() - client.set_connection_params("192.168.1.10", 0x1000, 0x2000) - client.connect("192.168.1.10", 0, 0) - -Using a Non-Standard Port -^^^^^^^^^^^^^^^^^^^^^^^^^^ - -.. code-block:: python - - import snap7 - - client = snap7.Client() - client.connect("192.168.1.10", 0, 1, tcp_port=1102) +.. contents:: On this page + :local: + :depth: 2 -Address Mapping Guide ---------------------- +Address Mapping +--------------- PLC addresses in Siemens TIA Portal / STEP 7 map to python-snap7 API calls as follows. @@ -155,8 +71,8 @@ as follows. You read from PLC offset 10, but ``data[0]`` *is* byte 10 from the PLC. -Data Types Cookbook -------------------- +Data Types +---------- Each example below shows a complete read and write cycle. @@ -169,11 +85,6 @@ the whole byte back. .. code-block:: python - import snap7 - - client = snap7.Client() - client.connect("192.168.1.10", 0, 1) - # Read DB1.DBX0.3 (bit 3 of byte 0) data = client.db_read(1, 0, 1) value = snap7.util.get_bool(data, 0, 3) @@ -418,7 +329,7 @@ Counters (C) Analog I/O ------------ +---------- Analog inputs are typically 16-bit integers in the peripheral input area (``Area.PE``). The raw value from the PLC needs to be scaled to engineering @@ -467,163 +378,3 @@ Writing Analog Outputs The standard scaling factor 27648 applies to most Siemens analog I/O modules. Check your module documentation for the actual range. - - -Multi-Variable Read -------------------- - -The ``read_multi_vars`` method reads multiple variables in a single PDU -request, which is significantly faster than individual reads. - -.. code-block:: python - - import snap7 - from snap7.type import Area, WordLen, S7DataItem - from ctypes import c_uint8, cast, POINTER - - client = snap7.Client() - client.connect("192.168.1.10", 0, 1) - - # Prepare items to read - items = [] - - # Item 1: 4 bytes from DB1, offset 0 - item1 = S7DataItem() - item1.Area = Area.DB - item1.WordLen = WordLen.Byte - item1.DBNumber = 1 - item1.Start = 0 - item1.Amount = 4 - buffer1 = (c_uint8 * 4)() - item1.pData = cast(buffer1, POINTER(c_uint8)) - items.append(item1) - - # Item 2: 2 bytes from DB2, offset 10 - item2 = S7DataItem() - item2.Area = Area.DB - item2.WordLen = WordLen.Byte - item2.DBNumber = 2 - item2.Start = 10 - item2.Amount = 2 - buffer2 = (c_uint8 * 2)() - item2.pData = cast(buffer2, POINTER(c_uint8)) - items.append(item2) - - # Execute the multi-read - result, data_items = client.read_multi_vars(items) - - # Access the returned data - value1 = bytearray(buffer1) - value2 = bytearray(buffer2) - -.. warning:: - - The S7 protocol limits multi-variable reads to **20 items** per request. - If you need more, split them across multiple calls. - - -Server Setup for Testing -------------------------- - -The built-in server lets you test your client code without a physical PLC. - -Basic Server Example -^^^^^^^^^^^^^^^^^^^^ - -.. code-block:: python - - from snap7.server import Server - from snap7.type import SrvArea - from ctypes import c_char - - # Create and configure the server - server = Server() - - # Register a data block (DB1) with 100 bytes - db_size = 100 - db_data = bytearray(db_size) - db_array = (c_char * db_size).from_buffer(db_data) - server.register_area(SrvArea.DB, 1, db_array) - - # Start the server on a non-privileged port - server.start(tcp_port=1102) - -Client-Server Round Trip -^^^^^^^^^^^^^^^^^^^^^^^^^ - -.. code-block:: python - - import snap7 - from snap7.server import Server - from snap7.type import SrvArea - from ctypes import c_char - - # --- Server setup --- - server = Server() - db_size = 100 - db_data = bytearray(db_size) - db_array = (c_char * db_size).from_buffer(db_data) - server.register_area(SrvArea.DB, 1, db_array) - server.start(tcp_port=1102) - - # --- Client connection --- - client = snap7.Client() - client.connect("127.0.0.1", 0, 1, tcp_port=1102) - - # Write data - client.db_write(1, 0, bytearray([0x01, 0x02, 0x03, 0x04])) - - # Read it back - data = client.db_read(1, 0, 4) - print(f"Read back: {list(data)}") # [1, 2, 3, 4] - - # Clean up - client.disconnect() - server.stop() - -Registering Multiple Areas -^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -.. code-block:: python - - from snap7.server import Server - from snap7.type import SrvArea - from ctypes import c_char - - server = Server() - - # Register DB1 - db1_data = bytearray(100) - db1 = (c_char * 100).from_buffer(db1_data) - server.register_area(SrvArea.DB, 1, db1) - - # Register DB2 - db2_data = bytearray(200) - db2 = (c_char * 200).from_buffer(db2_data) - server.register_area(SrvArea.DB, 2, db2) - - # Register merker area (256 bytes) - mk_data = bytearray(256) - mk = (c_char * 256).from_buffer(mk_data) - server.register_area(SrvArea.MK, 0, mk) - - server.start(tcp_port=1102) - -.. note:: - - Use a port number above 1024 (e.g., 1102) to avoid requiring root/admin - privileges. Port 102 is the standard S7 port but is in the privileged - range. - -Using the Mainloop Helper -^^^^^^^^^^^^^^^^^^^^^^^^^^ - -For quick testing, the ``mainloop`` function starts a server with common -data blocks pre-registered: - -.. code-block:: python - - from snap7.server import mainloop - - # Blocks the current thread - mainloop(tcp_port=1102) diff --git a/doc/server.rst b/doc/server.rst new file mode 100644 index 00000000..f46e1649 --- /dev/null +++ b/doc/server.rst @@ -0,0 +1,113 @@ +Server Setup for Testing +======================== + +The built-in server lets you test your client code without a physical PLC. + +.. contents:: On this page + :local: + :depth: 2 + + +Basic Server Example +-------------------- + +.. code-block:: python + + from snap7.server import Server + from snap7.type import SrvArea + from ctypes import c_char + + # Create and configure the server + server = Server() + + # Register a data block (DB1) with 100 bytes + db_size = 100 + db_data = bytearray(db_size) + db_array = (c_char * db_size).from_buffer(db_data) + server.register_area(SrvArea.DB, 1, db_array) + + # Start the server on a non-privileged port + server.start(tcp_port=1102) + + +Client-Server Round Trip +------------------------- + +.. code-block:: python + + import snap7 + from snap7.server import Server + from snap7.type import SrvArea + from ctypes import c_char + + # --- Server setup --- + server = Server() + db_size = 100 + db_data = bytearray(db_size) + db_array = (c_char * db_size).from_buffer(db_data) + server.register_area(SrvArea.DB, 1, db_array) + server.start(tcp_port=1102) + + # --- Client connection --- + client = snap7.Client() + client.connect("127.0.0.1", 0, 1, tcp_port=1102) + + # Write data + client.db_write(1, 0, bytearray([0x01, 0x02, 0x03, 0x04])) + + # Read it back + data = client.db_read(1, 0, 4) + print(f"Read back: {list(data)}") # [1, 2, 3, 4] + + # Clean up + client.disconnect() + server.stop() + + +Registering Multiple Areas +--------------------------- + +.. code-block:: python + + from snap7.server import Server + from snap7.type import SrvArea + from ctypes import c_char + + server = Server() + + # Register DB1 + db1_data = bytearray(100) + db1 = (c_char * 100).from_buffer(db1_data) + server.register_area(SrvArea.DB, 1, db1) + + # Register DB2 + db2_data = bytearray(200) + db2 = (c_char * 200).from_buffer(db2_data) + server.register_area(SrvArea.DB, 2, db2) + + # Register merker area (256 bytes) + mk_data = bytearray(256) + mk = (c_char * 256).from_buffer(mk_data) + server.register_area(SrvArea.MK, 0, mk) + + server.start(tcp_port=1102) + +.. note:: + + Use a port number above 1024 (e.g., 1102) to avoid requiring root/admin + privileges. Port 102 is the standard S7 port but is in the privileged + range. + + +Using the Mainloop Helper +-------------------------- + +For quick testing, the ``mainloop`` function starts a server with common +data blocks pre-registered: + +.. code-block:: python + + from snap7.server import mainloop + + # Blocks the current thread + mainloop(tcp_port=1102) diff --git a/doc/thread-safety.rst b/doc/thread-safety.rst new file mode 100644 index 00000000..235a89f6 --- /dev/null +++ b/doc/thread-safety.rst @@ -0,0 +1,39 @@ +Thread Safety +============= + +The ``Client`` class is **not** thread-safe. Concurrent calls from multiple +threads on the same ``Client`` instance will corrupt the TCP connection state +and cause unpredictable errors. + +**Option 1: One client per thread** + +.. code-block:: python + + import threading + import snap7 + + def worker(address: str, rack: int, slot: int) -> None: + client = snap7.Client() + client.connect(address, rack, slot) + data = client.db_read(1, 0, 10) + client.disconnect() + + t1 = threading.Thread(target=worker, args=("192.168.1.10", 0, 1)) + t2 = threading.Thread(target=worker, args=("192.168.1.10", 0, 1)) + t1.start() + t2.start() + +**Option 2: Shared client with a lock** + +.. code-block:: python + + import threading + import snap7 + + client = snap7.Client() + client.connect("192.168.1.10", 0, 1) + lock = threading.Lock() + + def safe_read(db: int, start: int, size: int) -> bytearray: + with lock: + return client.db_read(db, start, size) diff --git a/doc/tia-portal-config.rst b/doc/tia-portal-config.rst new file mode 100644 index 00000000..73932db6 --- /dev/null +++ b/doc/tia-portal-config.rst @@ -0,0 +1,56 @@ +.. _tia-portal-config: + +TIA Portal Configuration +========================= + +S7-1200 and S7-1500 PLCs require specific configuration in TIA Portal before +python-snap7 can communicate with them. Without these settings, you will get +``CLI : function refused by CPU`` errors. + +.. contents:: On this page + :local: + :depth: 2 + + +Step 1: Enable PUT/GET Communication +------------------------------------- + +1. Open your project in TIA Portal. +2. In the project tree, double-click on the PLC device. +3. Go to **Properties** > **Protection & Security** > **Connection mechanisms**. +4. Check **Permit access with PUT/GET communication from remote partner**. +5. Compile and download to the PLC. + +.. warning:: + + This setting allows any network client to read and write PLC memory without + authentication. Only enable this on isolated industrial networks. + + +Step 2: Disable Optimized Block Access +--------------------------------------- + +This must be done for **each** data block you want to access: + +1. In the project tree, right-click on the data block (e.g., DB1). +2. Select **Properties**. +3. Go to the **Attributes** tab. +4. **Uncheck** "Optimized block access". +5. Click OK. +6. Compile and download to the PLC. + +.. warning:: + + Changing the "Optimized block access" setting reinitializes the data block, + which resets all values in that DB to their defaults. Do this before + commissioning, or back up your data first. + + +Step 3: Compile and Download +----------------------------- + +After making both changes: + +1. Compile the project (**Build** > **Compile**). +2. Download to the PLC (**Online** > **Download to device**). +3. The PLC may need to restart depending on the changes. diff --git a/doc/troubleshooting.rst b/doc/troubleshooting.rst deleted file mode 100644 index 27510632..00000000 --- a/doc/troubleshooting.rst +++ /dev/null @@ -1,283 +0,0 @@ -Troubleshooting -=============== - -This page covers the most common issues encountered when using python-snap7 -and how to resolve them. - -.. contents:: On this page - :local: - :depth: 2 - - -Error Message Reference ------------------------ - -The following table maps common S7 error strings to their likely cause and fix. - -.. list-table:: - :header-rows: 1 - :widths: 35 30 35 - - * - Error message - - Likely cause - - Fix - * - ``CLI : function refused by CPU (Unknown error)`` - - PUT/GET communication is not enabled on the PLC, or the data block - still has optimized block access enabled. - - Enable PUT/GET in TIA Portal and disable optimized block access on each - DB. See :ref:`s7-1200-1500-configuration` below. - * - ``CPU : Function not available`` - - The requested function is not supported on this PLC model. S7-1200 and - S7-1500 PLCs restrict certain operations. - - Check Siemens documentation for your PLC model. Some functions are only - available on S7-300/400. - * - ``CPU : Item not available`` - - Wrong DB number, the DB does not exist, or the address is out of range. - - Verify the DB number exists on the PLC and that the offset and size are - within bounds. - * - ``CPU : Address out of range`` - - Reading or writing past the end of a DB or memory area. - - Check the DB size in TIA Portal and ensure ``start + size`` does not - exceed it. - * - ``CPU : Function not authorized for current protection level`` - - The PLC has password protection enabled. - - Remove or lower the protection level in TIA Portal under - Protection & Security. - * - ``ISO : An error occurred during recv TCP : Connection timed out`` - - Network issue: PLC is unreachable, a firewall is blocking port 102, or - the PLC is not responding. - - Check network connectivity (``ping``), verify firewall rules, and ensure - the PLC is powered on and reachable. - * - ``ISO : An error occurred during send TCP : Connection timed out`` - - Same as above. - - Same as above. - * - ``TCP : Unreachable peer`` - - The PLC is not reachable on the network. - - Verify IP address, subnet, and routing. Ensure the PLC Ethernet port is - connected and configured. - * - ``TCP : Connection reset`` / Socket error 32 (broken pipe) - - The connection to the PLC was lost unexpectedly. - - The PLC may have been restarted, the cable disconnected, or another - client took over the connection. See :ref:`connection-recovery` below. - - -.. _s7-1200-1500-configuration: - -S7-1200/1500 Configuration --------------------------- - -S7-1200 and S7-1500 PLCs require specific configuration in TIA Portal before -python-snap7 can communicate with them. Without these settings, you will get -``CLI : function refused by CPU`` errors. - -Step 1: Enable PUT/GET Communication -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -1. Open your project in TIA Portal. -2. In the project tree, double-click on the PLC device. -3. Go to **Properties** > **Protection & Security** > **Connection mechanisms**. -4. Check **Permit access with PUT/GET communication from remote partner**. -5. Compile and download to the PLC. - -.. warning:: - - This setting allows any network client to read and write PLC memory without - authentication. Only enable this on isolated industrial networks. - -Step 2: Disable Optimized Block Access -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -This must be done for **each** data block you want to access: - -1. In the project tree, right-click on the data block (e.g., DB1). -2. Select **Properties**. -3. Go to the **Attributes** tab. -4. **Uncheck** "Optimized block access". -5. Click OK. -6. Compile and download to the PLC. - -.. warning:: - - Changing the "Optimized block access" setting reinitializes the data block, - which resets all values in that DB to their defaults. Do this before - commissioning, or back up your data first. - -Step 3: Compile and Download -^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - -After making both changes: - -1. Compile the project (**Build** > **Compile**). -2. Download to the PLC (**Online** > **Download to device**). -3. The PLC may need to restart depending on the changes. - - -.. _connection-recovery: - -Connection Recovery -------------------- - -Network connections to PLCs can drop due to cable issues, PLC restarts, or -network problems. Use a reconnection pattern to handle this gracefully: - -.. code-block:: python - - import snap7 - import time - import logging - - logger = logging.getLogger(__name__) - - client = snap7.Client() - - def connect(address: str = "192.168.1.10", rack: int = 0, slot: int = 1) -> None: - client.connect(address, rack, slot) - - def safe_read(db: int, start: int, size: int) -> bytearray: - """Read from DB with automatic reconnection on failure.""" - try: - return client.db_read(db, start, size) - except Exception: - logger.warning("Read failed, attempting reconnection...") - try: - client.disconnect() - except Exception: - pass - time.sleep(1) - connect() - return client.db_read(db, start, size) - - def safe_write(db: int, start: int, data: bytearray) -> None: - """Write to DB with automatic reconnection on failure.""" - try: - client.db_write(db, start, data) - except Exception: - logger.warning("Write failed, attempting reconnection...") - try: - client.disconnect() - except Exception: - pass - time.sleep(1) - connect() - client.db_write(db, start, data) - -For long-running applications, wrap your main loop with reconnection logic: - -.. code-block:: python - - while True: - try: - data = safe_read(1, 0, 10) - # process data... - time.sleep(0.5) - except Exception: - logger.error("Failed after reconnection attempt, retrying in 5s...") - time.sleep(5) - - -Connection Timeout ------------------- - -The default connection timeout is 5 seconds. You can configure it by accessing -the underlying connection object: - -.. code-block:: python - - import snap7 - - client = snap7.Client() - - # Connect with a custom timeout (in seconds) - client.connect("192.168.1.10", 0, 1) - - # The timeout is set on the underlying connection - # Default is 5.0 seconds - client.connection.timeout = 10.0 # Set to 10 seconds - -To set the timeout **before** connecting, use ``set_connection_params`` and then -connect manually, or simply reconnect after adjusting: - -.. code-block:: python - - client = snap7.Client() - client.connect("192.168.1.10", 0, 1) - - # Adjust timeout for slow networks - client.connection.timeout = 15.0 - -.. note:: - - If you are experiencing frequent timeouts, check your network quality first. - Typical S7 communication on a local network should respond within - milliseconds. - - -Thread Safety -------------- - -The ``Client`` class is **not** thread-safe. Concurrent calls from multiple -threads on the same ``Client`` instance will corrupt the TCP connection state -and cause unpredictable errors. - -**Option 1: One client per thread** - -.. code-block:: python - - import threading - import snap7 - - def worker(address: str, rack: int, slot: int) -> None: - client = snap7.Client() - client.connect(address, rack, slot) - data = client.db_read(1, 0, 10) - client.disconnect() - - t1 = threading.Thread(target=worker, args=("192.168.1.10", 0, 1)) - t2 = threading.Thread(target=worker, args=("192.168.1.10", 0, 1)) - t1.start() - t2.start() - -**Option 2: Shared client with a lock** - -.. code-block:: python - - import threading - import snap7 - - client = snap7.Client() - client.connect("192.168.1.10", 0, 1) - lock = threading.Lock() - - def safe_read(db: int, start: int, size: int) -> bytearray: - with lock: - return client.db_read(db, start, size) - - -Protocol Limitations and FAQ ------------------------------ - -python-snap7 implements the S7 protocol over TCP/IP. The following operations -are **not possible** with this protocol: - -.. list-table:: - :header-rows: 1 - :widths: 40 60 - - * - Limitation - - Explanation - * - Read tag/symbol names from PLC - - Symbol names exist only in the TIA Portal project file, not in the PLC. - The S7 protocol only addresses data by area, DB number, and byte offset. - * - Get DB structure or layout from PLC - - The PLC stores only raw bytes. The structure definition lives in the TIA - Portal project. You must define your data layout in your Python code. - * - Discover PLCs on the network - - There is no S7 broadcast discovery mechanism. You must know the PLC's IP - address. - * - Create PLC backups - - Full project backup requires TIA Portal. python-snap7 can upload - individual blocks, but this is not a complete backup. - * - Access S7-1200/1500 PLCs with S7CommPlus security - - PLCs configured to require S7CommPlus encrypted communication cannot be - accessed with the classic S7 protocol. PUT/GET must be enabled as a - fallback. From 0dbcda48b5251dcaac08eb6563b6c97a63a23e5f Mon Sep 17 00:00:00 2001 From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com> Date: Mon, 23 Mar 2026 19:47:16 +0200 Subject: [PATCH 19/19] chore(deps): bump the all-dependencies group with 5 updates (#650) Bumps the all-dependencies group with 5 updates: | Package | From | To | | --- | --- | --- | | [pytest-cov](https://github.com/pytest-dev/pytest-cov) | `7.0.0` | `7.1.0` | | [ruff](https://github.com/astral-sh/ruff) | `0.15.4` | `0.15.7` | | [tox](https://github.com/tox-dev/tox) | `4.46.3` | `4.50.3` | | [tox-uv](https://github.com/tox-dev/tox-uv) | `1.33.0` | `1.33.4` | | [uv](https://github.com/astral-sh/uv) | `0.10.6` | `0.10.12` | Updates `pytest-cov` from 7.0.0 to 7.1.0 - [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst) - [Commits](https://github.com/pytest-dev/pytest-cov/compare/v7.0.0...v7.1.0) Updates `ruff` from 0.15.4 to 0.15.7 - [Release notes](https://github.com/astral-sh/ruff/releases) - [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md) - [Commits](https://github.com/astral-sh/ruff/compare/0.15.4...0.15.7) Updates `tox` from 4.46.3 to 4.50.3 - [Release notes](https://github.com/tox-dev/tox/releases) - [Changelog](https://github.com/tox-dev/tox/blob/main/docs/changelog.rst) - [Commits](https://github.com/tox-dev/tox/compare/4.46.3...4.50.3) Updates `tox-uv` from 1.33.0 to 1.33.4 - [Release notes](https://github.com/tox-dev/tox-uv/releases) - [Commits](https://github.com/tox-dev/tox-uv/compare/1.33.0...1.33.4) Updates `uv` from 0.10.6 to 0.10.12 - [Release notes](https://github.com/astral-sh/uv/releases) - [Changelog](https://github.com/astral-sh/uv/blob/main/CHANGELOG.md) - [Commits](https://github.com/astral-sh/uv/compare/0.10.6...0.10.12) --- updated-dependencies: - dependency-name: pytest-cov dependency-version: 7.1.0 dependency-type: direct:production update-type: version-update:semver-minor dependency-group: all-dependencies - dependency-name: ruff dependency-version: 0.15.7 dependency-type: direct:production update-type: version-update:semver-patch dependency-group: all-dependencies - dependency-name: tox dependency-version: 4.50.3 dependency-type: direct:production update-type: version-update:semver-minor dependency-group: all-dependencies - dependency-name: tox-uv dependency-version: 1.33.4 dependency-type: direct:production update-type: version-update:semver-patch dependency-group: all-dependencies - dependency-name: uv dependency-version: 0.10.12 dependency-type: direct:production update-type: version-update:semver-patch dependency-group: all-dependencies ... 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