implement (probably working) multicast

[record-dvb] / mcast.c

#include <strings.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>

#include "common.h"
#include "mcast.h"

int is_mcast(char *url)
{
	if (strlen(url) < 7)
		return 0;

	if (!strncasecmp("udp://",url,6))
		return 1;

	return 0;
}

int open_mcast(char *url)
{
	static struct dvb_host *dvbhost = NULL;
	struct sockaddr_in server;
	struct ip_mreq mreq;
	int fd;

	if(!is_mcast(url))
		return -1;

	if (!dvbhost) {
		dvbhost = parse(&(url[6]), "2000");
		dvbhost->socktype = SOCK_DGRAM;
	}

	if (resolve(dvbhost, &server) < 0) {
		return -1;
	}

	bzero(&mreq, sizeof(mreq));
	mreq.imr_multiaddr = server.sin_addr;
	mreq.imr_interface.s_addr = htonl(INADDR_ANY);

	if ((fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
		perror("socket");
		return -1;
	}

	if (bind(fd, (struct sockaddr*)&server, sizeof(server)) < 0) {
		perror("bind");
		return -1;
	}

	if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
		perror("setsockopt");
		return -1;
	}

	return fd;
}