+static int network_set_interface (const sockent_t *se, const struct addrinfo *ai) /* {{{ */
+{
+ DEBUG ("network plugin: network_set_interface: interface index = %i;",
+ network_config_interface_idx);
+
+ assert (se->type == SOCKENT_TYPE_CLIENT);
+
+ if (ai->ai_family == AF_INET)
+ {
+ struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
+#if KERNEL_LINUX
+ struct ip_mreqn mreq;
+#else
+ struct ip_mreq mreq;
+#endif
+
+ if (! IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
+ return (0);
+
+ mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
+#if KERNEL_LINUX
+ mreq.imr_address.s_addr = ntohl (INADDR_ANY);
+ mreq.imr_ifindex = network_config_interface_idx;
+#else
+ mreq.imr_interface.s_addr = ntohl (INADDR_ANY);
+#endif
+
+ if (setsockopt (se->data.client.fd, IPPROTO_IP, IP_MULTICAST_IF,
+ &mreq, sizeof (mreq)) == -1)
+ {
+ char errbuf[1024];
+ ERROR ("setsockopt: %s",
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ return (-1);
+ }
+ }
+ else if (ai->ai_family == AF_INET6)
+ {
+ struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
+
+ if (! IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
+ return (0);
+
+ if (setsockopt (se->data.client.fd, IPPROTO_IPV6, IPV6_MULTICAST_IF,
+ &network_config_interface_idx,
+ sizeof (network_config_interface_idx)) == -1)
+ {
+ char errbuf[1024];
+ ERROR ("setsockopt: %s",
+ sstrerror (errno, errbuf,
+ sizeof (errbuf)));
+ return (-1);
+ }
+ }
+
+ return (0);
+} /* }}} network_set_interface */
+