Generate Windows resource file on need basis

[vlc] / src / network / udp.c

diff --git a/src/network/udp.c b/src/network/udp.c
index f3e60981ab1f2d4e39babb83fd9e4ca1bc55d5bd..d00b09e704d6214780bb45102a00ace5ad001ab0 100644 (file)
--- a/src/network/udp.c
+++ b/src/network/udp.c
@@ -35,10 +35,6 @@
 
 #include <errno.h>
 
-#ifdef HAVE_SYS_TIME_H
-#    include <sys/time.h>
-#endif
-
 #include <vlc_network.h>
 
 #ifdef WIN32
@@ -174,18 +170,34 @@ static int net_ListenSingle (vlc_object_t *obj, const char *host, int port,
             continue;
         }
 
-        if (ptr->ai_next != NULL)
-        {
 #ifdef IPV6_V6ONLY
-            if ((ptr->ai_family != AF_INET6)
-             || setsockopt (fd, SOL_IPV6, IPV6_V6ONLY, &(int){ 0 },
-                            sizeof (int)))
-#endif
-            {
-                msg_Err (obj, "Multiple network protocols present");
-                msg_Err (obj, "Please select network protocol manually");
-            }
+        /* If IPv6 was forced, set IPv6-only mode.
+         * If IPv4 was forced, do nothing extraordinary.
+         * If nothing was forced, try dual-mode IPv6. */
+        if (ptr->ai_family == AF_INET6)
+        {
+            int on = (family == AF_INET6);
+            setsockopt (fd, SOL_IPV6, IPV6_V6ONLY, &on, sizeof (on));
         }
+        else if (ptr->ai_family == AF_INET && family == AF_UNSPEC)
+        {
+            for (const struct addrinfo *p = ptr; p != NULL; p = p->ai_next)
+                if (p->ai_family == AF_INET6)
+                {
+                    net_Close (fd);
+                    fd = -1;
+                    break;
+                }
+            if (fd == -1)
+                continue;
+        }
+#else
+        if (family == AF_UNSPEC && ptr->ai_next != NULL)
+        {
+            msg_Warn (obj, "ambiguous network protocol specification");
+            msg_Warn (obj, "please select IP version explicitly");
+        }
+#endif
 
         fd = net_SetupDgramSocket( obj, fd, ptr );
         if( fd == -1 )