#include <stdio.h>
#include <string.h>
#include <netinet/in.h>


int main(int argc, char **argv)
{
	struct sockaddr_storage dest;
	struct sockaddr_storage src;
	struct sockaddr_in *s = (struct sockaddr_in*) &src;
	struct sockaddr_in *d = (struct sockaddr_in *)&dest;
	int sock;
	char msg[] = "Hello Multicast";
	int off = 0;

	memset(&dest, 0, sizeof(dest));
	memset(&src, 0, sizeof(src));

	if (argc < 3) {
		printf("Usage: <src ip>  <mcast dest>\n");
		return 1;
	}


	d->sin_family = s->sin_family = AF_INET;
	d->sin_port = htons(2000);

	inet_aton(argv[1], &s->sin_addr);
	inet_aton(argv[2], &d->sin_addr);

	sock = socket(AF_INET, SOCK_DGRAM, 0);

	if (setsockopt(sock, IPPROTO_IP, IP_MULTICAST_LOOP, &off,
							sizeof(off))) {
		perror("setsockopt");
		return 1;
	}
	if (setsockopt(sock, IPPROTO_IP, IP_MULTICAST_IF, s, sizeof(*s))) {
		perror("setsockopt");
		return 1;
	}

	sendto(sock, msg, sizeof(msg), 0, (struct sockaddr *)d, sizeof(*d));

	close (socket);
	return 0;
}