client.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <string.h>

#define port 12340
#define buff_size 256
FILE *fp;
int main()
{
  char buff[buff_size];
  char filename[20];
  int sockfd = socket(AF_INET, SOCK_STREAM, 0);
  struct sockaddr_in server_address;

  server_address.sin_family = AF_INET;
  server_address.sin_port = htons(port);
  server_address.sin_addr.s_addr = INADDR_ANY;
  
  int connfd = connect(sockfd, (struct sockaddr*) &server_address, sizeof(server_address));
  
  recv(sockfd, filename, sizeof(filename), 0);
  printf(filename);
  fp = fopen(filename, "r");
  if(fp == NULL)
  {
    perror("fopen");
  }
  else
  {
    while (fgets(buff, sizeof(buff), fp)!= NULL)
      {
        send(sockfd, buff, sizeof(buff), 0);
      }
    fclose(fp);
  }
  close(sockfd);
}