Skip IPv6 UDP tracker addresses when IPv6 disabled

Author: parg

core/src/com/biglybt/core/tracker/client/impl/bt/TRTrackerBTAnnouncerImpl.java

@@ -2088,8 +2088,19 @@ protected TRTrackerAnnouncerResponseImpl updateSupport() {
 
  			Throwable last_error = null;
 
+ 			boolean all_skipped = true;
+ 			
+ 			boolean ipv6_enabled =  NetworkAdmin.getSingleton().isIPV6Enabled();
+ 			
  			for ( InetSocketAddress destination: url_addresses ){
 
+ 				if ( destination.getAddress() instanceof Inet6Address && !ipv6_enabled ){
+ 					
+ 					continue;
+ 				}
+ 				
+ 				all_skipped = false;
+ 				
  				try{
 	 	 			PRUDPPacketHandler handler = PRUDPPacketHandlerFactory.getHandler( handler_port );
 
@@ -2344,6 +2355,11 @@ protected TRTrackerAnnouncerResponseImpl updateSupport() {
  				}
  			}
 
+ 			if ( all_skipped ){
+ 				
+ 				throw( new Exception( "IPv6 disabled" ));
+ 			}
+ 			
  			if ( last_error != null ){
 
  				throw( last_error );