* Added net_AddressIsMulticast that takes a string and returns true if the...

* Added net_AddressIsMulticast that takes a string and returns true if the string seems to describe a valid IPv4 or IPv6 address.
* Changed all the SDP generators to only add /ttl to the c= line if the address is multicast.

include/network.h

@@ -31,9 +31,13 @@
 #elif defined( WIN32 )
 #   include <winsock2.h>
 #   include <ws2tcpip.h>
-#elif HAVE_SYS_SOCKET_H
+#else
+#   include <netdb.h>
+#if HAVE_SYS_SOCKET_H
 #   include <sys/socket.h>
 #endif
+#endif
+
 
 /*****************************************************************************
  * network_socket_t: structure passed to a network plug-in to define the
@@ -456,4 +460,57 @@ VLC_EXPORT( int, vlc_getnameinfo, ( const struct sockaddr *, int, char *, int, i
 VLC_EXPORT( int, vlc_getaddrinfo, ( vlc_object_t *, const char *, int, const struct addrinfo *, struct addrinfo ** ) );
 VLC_EXPORT( void, vlc_freeaddrinfo, ( struct addrinfo * ) );
 
+/*****************************************************************************
+ * net_AddressIsMulticast: This function returns VLC_FALSE if the psz_addr does
+ * not specify a multicast address or if the address is not a valid address.
+ * FIXME: Only the first returned address is checked. This might be problematic.
+ *****************************************************************************/
+static inline vlc_bool_t net_AddressIsMulticast( vlc_object_t *p_object, char *psz_addr )
+{
+    struct addrinfo hints, *res;
+    vlc_bool_t b_multicast = VLC_FALSE;
+    int i;
+
+    if( psz_addr == NULL )
+    {
+        msg_Err( p_object, "*FIXME* Unexpected NULL URI for net_AddressIsMulticast" );
+        msg_Err( p_object, "This should not happen. VLC needs fixing." );
+        return VLC_FALSE;
+    }
+    
+    memset( &hints, 0, sizeof( hints ) );
+    hints.ai_socktype = SOCK_DGRAM; /* UDP */
+    hints.ai_flags = AI_NUMERICHOST;
+
+    i = vlc_getaddrinfo( p_object, psz_addr, 0,
+                         &hints, &res );
+    /*if( i == 0 )
+        i = vlc_getnameinfo( res->ai_addr, res->ai_addrlen, psz_buf,
+                             sizeof( psz_buf ), NULL, NI_NUMERICHOST );*/
+    if( i )
+    {
+        msg_Err( p_object, "Invalid node for net_AddressIsMulticast: %s : %s",
+                 psz_addr, vlc_gai_strerror( i ) );
+        return b_multicast;
+    }
+    
+    if( res->ai_family == AF_INET )
+    {
+#if !defined( SYS_BEOS )
+        struct sockaddr_in *v4 = (struct sockaddr_in *) res->ai_addr;
+        b_multicast = ( ntohl( v4->sin_addr.s_addr ) > 0xe1000000 && ntohl( v4->sin_addr.s_addr ) <= 0xEFFFFFFF );
+#endif
+    }
+    else if( res->ai_family == AF_INET6 )
+    {
+#if defined( WIN32 ) || defined( HAVE_IF_NAMETOINDEX )
+        struct sockaddr_in6 *v6 = (struct sockaddr_in6 *) res->ai_addr;
+        b_multicast = IN6_IS_ADDR_MULTICAST( &v6->sin6_addr);
+#endif
+    }
+    
+    vlc_freeaddrinfo( res );
+    return b_multicast;
+}
+
 #endif

modules/misc/rtsp.c

@@ -1016,8 +1016,17 @@ static char *SDPGenerate( vod_media_t *p_media, char *psz_destination )
     p += sprintf( p, "t=0 0\r\n" ); /* FIXME */
     p += sprintf( p, "a=tool:"PACKAGE_STRING"\r\n" );
 
-    p += sprintf( p, "c=IN IP4 %s/%d\r\n", psz_destination ?
-                  psz_destination : "0.0.0.0", p_media->i_ttl );
+    p += sprintf( p, "c=IN IP4 %s", psz_destination ?  psz_destination : "0.0.0.0" );
+
+    if( net_AddressIsMulticast( p_media, psz_destination ?  psz_destination : "0.0.0.0" ) )
+    {
+        /* Add the ttl if it is a multicast address */
+	p += sprintf( p, "/%d\r\n", p_media->i_ttl );
+    }
+    else
+    {
+        p += sprintf( p, "\r\n" );
+    }
 
     if( p_media->i_length > 0 )
     p += sprintf( p, "a=range:npt=0-%.3f\r\n",

modules/services_discovery/sap.c

@@ -264,8 +264,6 @@ struct demux_sys_t
 #endif
     static void FreeSDP( sdp_t *p_sdp );
 
-/* Detect multicast addresses */
-static vlc_bool_t ismult( char * );
 
 #define FREE( p ) \
     if( p ) { free( p ); (p) = NULL; }
@@ -1036,7 +1034,7 @@ static int ParseConnection( vlc_object_t *p_obj, sdp_t *p_sdp )
         i_port = 1234;
     }
 
-    if( ismult( psz_uri ) )
+    if( net_AddressIsMulticast( p_obj, psz_uri ) )
     {
         asprintf( &p_sdp->psz_uri, "%s://@%s:%i", psz_proto, psz_uri, i_port );
     }
@@ -1299,32 +1297,6 @@ static char *convert_from_utf8( struct services_discovery_t *p_sd,
     return psz_local;
 }
 
-
-/***********************************************************************
- * ismult: returns true if we have a multicast address
- ***********************************************************************/
-static vlc_bool_t ismult( char *psz_uri )
-{
-    char *psz_end;
-    int  i_value;
-
-    /* IPv6 */
-    if( psz_uri[0] == '[')
-    {
-      if( strncasecmp( &psz_uri[1], "FF0" , 3) ||
-          ( !isalnum( psz_uri[1]) && strncasecmp( &psz_uri[2], "FF0" , 3) ) )
-            return( VLC_TRUE );
-        else
-            return( VLC_FALSE );
-    }
-    
-    i_value = strtol( psz_uri, &psz_end, 0 );
-
-    if( *psz_end != '.' ) { return( VLC_FALSE ); }
-
-    return ( ( i_value < 224 ) || ( i_value >= 240 ) ) ? VLC_FALSE : VLC_TRUE;
-}
-
 static int InitSocket( services_discovery_t *p_sd, char *psz_address,
                        int i_port )
 {

modules/stream_out/rtp.c

@@ -392,6 +392,7 @@ static int Open( vlc_object_t *p_this )
 
         char *psz_rtpmap;
         char access[100];
+        char psz_ttl[100];
         char url[p_sys->psz_destination ? strlen( p_sys->psz_destination ) + 1 + 12+1 : 14];
 
         /* Check muxer type */
@@ -465,7 +466,6 @@ static int Open( vlc_object_t *p_this )
            o= don't use the localhost address. use fully qualified domain name or IP4 address
            p= international phone number (pass via vars?)
            c= IP6 support
-           c= /ttl should only be added in case of multicast
            a= recvonly (missing)
            a= type:broadcast (missing)
            a= charset: (normally charset should be UTF-8, this can be used to override s= and i=)
@@ -477,6 +477,16 @@ static int Open( vlc_object_t *p_this )
                     10 + strlen( p_sys->psz_session_email ) + 10 + strlen( p_sys->psz_destination ) +
                     10 + 10 + strlen( PACKAGE_STRING ) +
                     20 + 10 + 20 + 10 + strlen( psz_rtpmap ) );
+
+        if( net_AddressIsMulticast( (vlc_object_t *)p_stream, p_sys->psz_destination ) )
+        {
+            sprintf( psz_ttl, "/%d", p_sys->i_ttl );
+        }
+        else
+        {
+            psz_ttl[0] = '\0'; 
+        }
+
         sprintf( p_sys->psz_sdp,
                  "v=0\r\n"
                  "o=- "I64Fd" %d IN IP4 127.0.0.1\r\n"
@@ -486,7 +496,7 @@ static int Open( vlc_object_t *p_this )
                  "e=%s\r\n"
                  "t=0 0\r\n" /* permanent stream */ /* when scheduled from vlm, we should set this info correctly */
                  "a=tool:"PACKAGE_STRING"\r\n"
-                 "c=IN IP4 %s/%d\r\n"
+                 "c=IN IP4 %s%s\r\n"
                  "m=video %d RTP/AVP %d\r\n"
                  "a=rtpmap:%d %s\r\n",
                  p_sys->i_sdp_id, p_sys->i_sdp_version,
@@ -494,7 +504,7 @@ static int Open( vlc_object_t *p_this )
                  p_sys->psz_session_description,
                  p_sys->psz_session_url,
                  p_sys->psz_session_email,
-                 p_sys->psz_destination, p_sys->i_ttl,
+                 p_sys->psz_destination, psz_ttl,
                  p_sys->i_port, p_sys->i_payload_type,
                  p_sys->i_payload_type, psz_rtpmap );
         fprintf( stderr, "sdp=%s", p_sys->psz_sdp );
@@ -695,7 +705,6 @@ static void SDPHandleUrl( sout_stream_t *p_stream, char *psz_url )
            o= don't use the localhost address. use fully qualified domain name or IP4 address
            p= international phone number (pass via vars?)
            c= IP6 support
-           c= /ttl should only be added in case of multicast
            a= recvonly (missing)
            a= type:broadcast (missing)
            a= charset: (normally charset should be UTF-8, this can be used to override s= and i=)
@@ -753,8 +762,17 @@ static char *SDPGenerate( sout_stream_t *p_stream, char *psz_destination, vlc_bo
     p += sprintf( p, "t=0 0\r\n" ); /* permanent stream */ /* when scheduled from vlm, we should set this info correctly */
     p += sprintf( p, "a=tool:"PACKAGE_STRING"\r\n" );
 
-    p += sprintf( p, "c=IN IP4 %s/%d\r\n", psz_destination ? psz_destination : "0.0.0.0",
-                  p_sys->i_ttl );
+    p += sprintf( p, "c=IN IP4 %s", psz_destination ? psz_destination : "0.0.0.0" );
+
+    if( net_AddressIsMulticast( (vlc_object_t *)p_stream, psz_destination ? psz_destination : "0.0.0.0" ) )
+    {
+        /* Add the ttl if it is a multicast address */
+        p += sprintf( p, "/%d\r\n", p_sys->i_ttl );
+    }
+    else
+    {
+        p += sprintf( p, "\r\n" );
+    }
 
     for( i = 0; i < p_sys->i_es; i++ )
     {