Build system: Check for "struct ip_mreqn".

Use this rather than hard-coding "if Linux …"

diff --git a/configure.in b/configure.in
index c2cb5d6..b5ce781 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -971,6 +971,13 @@ AC_CHECK_MEMBERS([struct net_device_stats.rx_bytes, struct net_device_stats.tx_p
        #include <linux/netdevice.h>
        ])
 
+AC_CHECK_MEMBERS([struct ip_mreqn.imr_ifindex], [],
+       [],
+       [
+       #include <netinet/in.h>
+       #include <net/if.h>
+       ])
+
 AC_CHECK_MEMBERS([struct kinfo_proc.ki_pid, struct kinfo_proc.ki_rssize, struct kinfo_proc.ki_rusage],
        [
                AC_DEFINE(HAVE_STRUCT_KINFO_PROC_FREEBSD, 1,

diff --git a/src/network.c b/src/network.c
index b1b9e39..6d0381b 100644 (file)
--- a/src/network.c
+++ b/src/network.c
@@ -1600,17 +1600,23 @@ static int network_set_interface (const sockent_t *se, const struct addrinfo *ai
 
                if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
                {
-#if KERNEL_LINUX
+#if HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
+                       /* If possible, use the "ip_mreqn" structure which has
+                        * an "interface index" member. Using the interface
+                        * index is preferred here, because of its similarity
+                        * to the way IPv6 handles this. Unfortunately, it
+                        * appears not to be portable. */
                        struct ip_mreqn mreq;
-#else
-                       struct ip_mreq mreq;
-#endif
 
+                       memset (&mreq, 0, sizeof (mreq));
                        mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
-#if KERNEL_LINUX
                        mreq.imr_address.s_addr = ntohl (INADDR_ANY);
                        mreq.imr_ifindex = se->interface;
 #else
+                       struct ip_mreq mreq;
+
+                       memset (&mreq, 0, sizeof (mreq));
+                       mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
                        mreq.imr_interface.s_addr = ntohl (INADDR_ANY);
 #endif
 
@@ -1701,7 +1707,7 @@ static int network_bind_socket (int fd, const struct addrinfo *ai, const int int
                struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
                if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
                {
-#if KERNEL_LINUX
+#if HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
                        struct ip_mreqn mreq;
 #else
                        struct ip_mreq mreq;
@@ -1710,7 +1716,10 @@ static int network_bind_socket (int fd, const struct addrinfo *ai, const int int
                        DEBUG ("fd = %i; IPv4 multicast address found", fd);
 
                        mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
-#if KERNEL_LINUX
+#if HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
+                       /* Set the interface using the interface index if
+                        * possible (available). Unfortunately, the struct
+                        * ip_mreqn is not portable. */
                        mreq.imr_address.s_addr = ntohl (INADDR_ANY);
                        mreq.imr_ifindex = interface_idx;
 #else