#include <errno.h>
#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>

volatile int is = 1;

void sig_int(int sig_no)
{
  is = 0;
  return;
}

int main()
{ int sock, len;
  struct sockaddr_in addr;
  char buff[256];

  if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
  {
    fprintf(stderr, "%d ", errno);
    perror("socket()");
    return 1;
  }

  addr.sin_family = AF_INET;
  addr.sin_addr.s_addr = INADDR_ANY;
  addr.sin_port = htons(10000);

  signal(SIGINT, sig_int);

  if (bind(sock, (struct sockaddr*)&addr, sizeof(struct sockaddr_in)) == -1)
  {
    fprintf(stderr, "%d ", errno);
    perror("bind()");
  }

  while(is)
  { memset(buff, 0, 256);
    len = sizeof(struct sockaddr_in);
    memset(&addr, 0, sizeof(struct sockaddr_in));
    if (recvfrom(sock, buff, 255, 0, (struct sockaddr*)&addr, &len) == -1)
    {
      fprintf(stderr, "%d ", errno);
      perror("recvfrom()");
    }
    addr.sin_addr.s_addr = htonl(addr.sin_addr.s_addr);
    addr.sin_port = htons(addr.sin_port);
    printf("%d.%d.%d.%d:%d (%d) > %s\n", (addr.sin_addr.s_addr >> 24),
           ((addr.sin_addr.s_addr >> 16) & 0xff),
    ((addr.sin_addr.s_addr >> 8) & 0xff),
    (addr.sin_addr.s_addr & 0xff), addr.sin_port, len, buff);
  }

  close(sock);
  return 0;
}