Untitled

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/ip.h>

#define PORT 1096

void name_socket(int socket_descriptor)
{
  struct sockaddr_in server_address = {
      .sin_family = AF_INET,
      .sin_port = PORT,
      .sin_addr = {INADDR_ANY}};

  if (bind(socket_descriptor, (struct sockaddr *)&server_address, sizeof(server_address)) < 0)
    perror("bind");
}

void get_and_print_message(int socket_descriptor)
{
  char buffer[512];
  struct sockaddr_in client_address;
  socklen_t address_length = sizeof(client_address);

  int received_bytes = recvfrom(socket_descriptor, (void *)buffer, sizeof(buffer), 0, (struct sockaddr *)&client_address, &address_length);
  if (received_bytes < 0)
    perror("recvfrom");
  else
  {
    buffer[received_bytes] = '\0';
    puts(buffer);
    const char *message = "Serwer odebrał komunikat.";
    if (sendto(socket_descriptor, message, strlen(message), 0, (struct sockaddr *)&client_address, sizeof(client_address)) < 0)
      perror("sendto");
  }
}

int main(void)
{
  int socket_descriptor = socket(AF_INET, SOCK_DGRAM, 0);
  if (socket_descriptor < 0)
    perror("socket");

  name_socket(socket_descriptor);
  get_and_print_message(socket_descriptor);

  if (close(socket_descriptor) < 0)
    perror("close");
  return 0;
}s