lib: use "protocol-independed API" from RFC3678, if that is available
(This commit is based on the patch from BZ#420, and should fix that bug.)
* configure.ac: detect availability of that API
* sockopt.c (setsockopt_ipv4_multicast): use it for join/leave IPv4
multicast groups
diff --git a/lib/sockopt.c b/lib/sockopt.c
index 8a1eec1..9ff15ca 100644
--- a/lib/sockopt.c
+++ b/lib/sockopt.c
@@ -209,17 +209,35 @@
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,