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[catta] / avahi-core / socket.c

diff --git a/avahi-core/socket.c b/avahi-core/socket.c
index e3e394ae3e197bafe799570b358238ead2609c3f..cd5241df8d3aa9334152d8b5b01999c66da0f777 100644 (file)
--- a/avahi-core/socket.c
+++ b/avahi-core/socket.c
@@ -457,6 +457,9 @@ int avahi_send_dns_packet_ipv4(int fd, AvahiIfIndex interface, AvahiDnsPacket *p
 #ifdef IP_PKTINFO
     struct cmsghdr *cmsg;
     uint8_t cmsg_data[CMSG_SPACE(sizeof(struct in_pktinfo))];
+#elif defined(IP_SENDSRCADDR)
+    struct cmsghdr *cmsg;
+    uint8_t cmsg_data[CMSG_SPACE(sizeof(struct in_addr))];
 #endif
 
     assert(fd >= 0);
@@ -503,10 +506,32 @@ int avahi_send_dns_packet_ipv4(int fd, AvahiIfIndex interface, AvahiDnsPacket *p
         msg.msg_control = cmsg_data;
         msg.msg_controllen = sizeof(cmsg_data);
     }
-#else
-#ifdef __GNUC__
-#warning "FIXME: We need some code to set the outgoing interface/local address here if IP_PKTINFO is not available"
-#endif
+#elif defined(IP_SENDSRCADDR)
+    if (src_address) {
+        struct in_addr *addr;
+      
+       memset(cmsg_data, 0, sizeof(cmsg_data));
+       cmsg = (struct cmsghdr*) cmsg_data;
+       cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_addr));
+       cmsg->cmsg_level = IPPROTO_IP;
+       cmsg->cmsg_type = IP_SENDSRCADDR;
+       
+       addr = (struct in_addr *)CMSG_DATA(cmsg);
+       addr->s_addr =  src_address->address;
+       
+       msg.msg_control = cmsg_data;
+       msg.msg_controllen = sizeof(cmsg_data);
+    }
+#elif defined(IP_MULTICAST_IF)
+    {
+        struct in_addr any = { INADDR_ANY };
+       if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF, src_address ? (const void*) &src_address->address : (const void*) &any, sizeof(struct in_addr)) < 0) {
+           avahi_log_warn("IP_MULTICAST_IF failed: %s", strerror(errno));
+           return -1;
+       }
+    }
+#elif defined(__GNUC__)
+#warning "FIXME: We need some code to set the outgoing interface/local address here if IP_PKTINFO/IP_MULTICAST_IF is not available"
 #endif
 
     return sendmsg_loop(fd, &msg, 0);