diff options
Diffstat (limited to 'lib/sockopt.c')
| -rw-r--r-- | lib/sockopt.c | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/lib/sockopt.c b/lib/sockopt.c index 8a1eec12..9ff15ca6 100644 --- a/lib/sockopt.c +++ b/lib/sockopt.c @@ -209,17 +209,35 @@ setsockopt_ipv4_multicast(int sock, unsigned int mcast_addr, unsigned int ifindex) { +#ifdef HAVE_RFC3678 + struct group_req gr; + struct sockaddr_in *si; + int ret; + memset (&gr, 0, sizeof(gr)); + si = (struct sockaddr_in *)&gr.gr_group; + gr.gr_interface = ifindex; + si->sin_family = AF_INET; +#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN + si->sin_len = sizeof(struct sockaddr_in); +#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */ + si->sin_addr.s_addr = mcast_addr; + ret = setsockopt(sock, IPPROTO_IP, (optname == IP_ADD_MEMBERSHIP) ? + MCAST_JOIN_GROUP : MCAST_LEAVE_GROUP, (void *)&gr, sizeof(gr)); + if ((ret < 0) && (optname == IP_ADD_MEMBERSHIP) && (errno == EADDRINUSE)) + { + setsockopt(sock, IPPROTO_IP, MCAST_LEAVE_GROUP, (void *)&gr, sizeof(gr)); + ret = setsockopt(sock, IPPROTO_IP, MCAST_JOIN_GROUP, (void *)&gr, sizeof(gr)); + } + return ret; -#ifdef HAVE_STRUCT_IP_MREQN_IMR_IFINDEX +#elif defined(HAVE_STRUCT_IP_MREQN_IMR_IFINDEX) && !defined(__FreeBSD__) struct ip_mreqn mreqn; int ret; assert(optname == IP_ADD_MEMBERSHIP || optname == IP_DROP_MEMBERSHIP); memset (&mreqn, 0, sizeof(mreqn)); - if (mcast_addr) - mreqn.imr_multiaddr.s_addr = mcast_addr; - + mreqn.imr_multiaddr.s_addr = mcast_addr; mreqn.imr_ifindex = ifindex; ret = setsockopt(sock, IPPROTO_IP, optname, |