/*
 * Simple ECHO udp server
 * (c)2013 JBY
 */
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

#define PORT 5678

int main(int argc,char *argv[]) {
  struct sockaddr_in addr, from;
  int sock;
  char tampon[256];
  socklen_t lg;
  int r;

  sock = socket(PF_INET,SOCK_DGRAM,0); // Protocol family
  if (sock==-1) {
    perror("socket: ");
    exit(1);
  }
  addr.sin_family = AF_INET; // Address family
  addr.sin_port = htons(PORT);
  addr.sin_addr.s_addr = htonl(INADDR_ANY);
  if (bind(sock,(struct sockaddr *)(&addr),sizeof(addr))==-1) {
    perror("bind: ");
    close(sock);
    exit(1);
  }
  while (1) {
    // Get a message
    lg = sizeof(from);
    r = recvfrom(sock,tampon,256,0,(struct sockaddr *)(&from),&lg);
    if (r==-1) {
      perror("recv:");
      close(sock);
      exit(1);
    }
    // Print it
    tampon[r] = '\0';
    printf("Recu : %s depuis la machine %08x et du port %d\n",tampon,ntohl(from.sin_addr.s_addr),ntohs(from.sin_port));
    if (!strcmp(tampon,"quit")) break;
    // Send it back
    if (sendto(sock,tampon,256,0,(struct sockaddr *)(&from),lg)==-1) {
      perror("sendto:");
      close(sock);
      exit(1);
    }
    printf("Renvoye : %s\n",tampon);
  }
  close(sock);
  return 0;
}