training_repo/file_transfer/client_file_transfer.c

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

#define PORT 12345
#define CHUNK_SIZE 1024

void handle_error(const char *msg) {
        perror(msg);
            exit(1);
}

int main()
{
    int client_fd, file_fd;
    struct sockaddr_in server_addr;
    char buffer[CHUNK_SIZE];
    char filename[256];
    ssize_t bytes_received, bytes_written;
    client_fd = socket(AF_INET, SOCK_STREAM, 0);
    if (client_fd < 0)
    {
        handle_error("Socket creation failed");
    }
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(PORT);
    if (inet_pton(AF_INET, "127.0.0.1", &server_addr.sin_addr) <= 0)
    {
        handle_error("Invalid address");
    }
    if (connect(client_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0)
    {
        handle_error("Connection failed");
    }
    // Ask for the filename from the user
    printf("Enter the filename you want to request: ");
    fgets(filename, sizeof(filename), stdin);
    filename[strcspn(filename, "\n")] = 0; // Remove newline character
    // Send the filename to the server
    if (send(client_fd, filename, strlen(filename), 0) < 0)
    {
        handle_error("Failed to send filename");
    }
   // Open a file to write the received data
   strcpy(filename, "HelloWorld.txt");
   file_fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);
   if (file_fd < 0)
   {
       handle_error("File creation failed");
   }
   // Receive the file in chunks and write to disk
   while ((bytes_received = recv(client_fd, buffer, CHUNK_SIZE, 0)) > 0)
   {
        bytes_written = write(file_fd, buffer, bytes_received);
        if (bytes_written < 0)
        {
            perror("Write to file failed");
            break;
        }
   }
  if (bytes_received < 0)
  {
       perror("Receive failed");
  } else {
  printf("File received successfully\n");
     }
close(file_fd);
close(client_fd);
return 0;
}