+ /* Look up address and port */
+ if(!(res = get_address(&sl, &prefs, &sockname)))
+ exit(1);
+ addr = res->ai_addr;
+ addr_len = res->ai_addrlen;
+ /* Create the socket */
+ if((rtpfd = socket(res->ai_family,
+ res->ai_socktype,
+ res->ai_protocol)) < 0)
+ disorder_fatal(errno, "error creating socket");
+ /* Allow multiple listeners */
+ xsetsockopt(rtpfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
+ is_multicast = multicast(addr);
+ /* The multicast and unicast/broadcast cases are different enough that they
+ * are totally split. Trying to find commonality between them causes more
+ * trouble that it's worth. */
+ if(is_multicast) {
+ /* Stash the multicast group address */
+ memcpy(&mgroup, addr, addr_len);
+ switch(res->ai_addr->sa_family) {
+ case AF_INET:
+ mgroup.in.sin_port = 0;
+ break;
+ case AF_INET6:
+ mgroup.in6.sin6_port = 0;
+ break;
+ default:
+ disorder_fatal(0, "unsupported address family %d",
+ (int)addr->sa_family);
+ }
+ /* Bind to to the multicast group address */
+ if(bind(rtpfd, addr, addr_len) < 0)
+ disorder_fatal(errno, "error binding socket to %s",
+ format_sockaddr(addr));
+ /* Add multicast group membership */
+ switch(mgroup.sa.sa_family) {
+ case PF_INET:
+ mreq.imr_multiaddr = mgroup.in.sin_addr;
+ mreq.imr_interface.s_addr = 0; /* use primary interface */
+ if(setsockopt(rtpfd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
+ &mreq, sizeof mreq) < 0)
+ disorder_fatal(errno, "error calling setsockopt IP_ADD_MEMBERSHIP");
+ break;
+ case PF_INET6:
+ mreq6.ipv6mr_multiaddr = mgroup.in6.sin6_addr;
+ memset(&mreq6.ipv6mr_interface, 0, sizeof mreq6.ipv6mr_interface);
+ if(setsockopt(rtpfd, IPPROTO_IPV6, IPV6_JOIN_GROUP,
+ &mreq6, sizeof mreq6) < 0)
+ disorder_fatal(errno, "error calling setsockopt IPV6_JOIN_GROUP");
+ break;
+ default:
+ disorder_fatal(0, "unsupported address family %d", res->ai_family);
+ }
+ /* Report what we did */
+ disorder_info("listening on %s multicast group %s",
+ format_sockaddr(addr), format_sockaddr(&mgroup.sa));
+ } else {
+ /* Bind to 0/port */
+ switch(addr->sa_family) {
+ case AF_INET: {
+ struct sockaddr_in *in = (struct sockaddr_in *)addr;