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

int main (int argc, char * argv[])
{
  int sfd;
  char buf[512];
  struct sockaddr_in localAddress, serverAddress;
  struct ip_mreqn multicast;

  socklen_t server_len = sizeof(serverAddress);

  sfd = socket (PF_INET, SOCK_DGRAM, 0);
  localAddress.sin_port = htons(7890);
  localAddress.sin_family = AF_INET;
  localAddress.sin_addr.s_addr = INADDR_ANY;

  inet_aton("228.5.6.7", &multicast.imr_multiaddr);
  multicast.imr_address.s_addr = INADDR_ANY;
  multicast.imr_ifindex = 0;

  setsockopt(sfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &multicast, sizeof(multicast));

  if (bind (sfd, (struct sockaddr*)&localAddress, sizeof(localAddress)) < 0)
  {
    printf("Erro no bind.");
    return 1;
  }

  while (1)
  {
    recvfrom(sfd, buf, sizeof(buf), 0, (struct sockaddr*)&serverAddress, &server_len);
    printf("received: %s\n", buf);
  }


  return 0;
}