From cf66227f0d775b4545aafb9a0d569cc1de159deb Mon Sep 17 00:00:00 2001
From: Charles Kerr <charles@transmissionbt.com>
Date: Thu, 12 Nov 2009 01:59:53 +0000
Subject: [PATCH] (trunk libT) #2573: Don't send BT_PORT messages over IPv6

---
 libtransmission/peer-msgs.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/libtransmission/peer-msgs.c b/libtransmission/peer-msgs.c
index 3b4868a47..3d88c7c93 100644
--- a/libtransmission/peer-msgs.c
+++ b/libtransmission/peer-msgs.c
@@ -2125,8 +2125,14 @@ tr_peerMsgsNew( struct tr_torrent * torrent,
     if( tr_peerIoSupportsLTEP( peer->io ) )
         sendLtepHandshake( m );
 
-    if(tr_peerIoSupportsDHT(peer->io))
-        protocolSendPort(m, tr_dhtPort(torrent->session));
+    if(tr_peerIoSupportsDHT(peer->io)) {
+        /* We don't have an IPv6 DHT yet.
+         * According to BEP-32, we can't send PORT over IPv6. */
+        const struct tr_address *addr = tr_peerIoGetAddress( peer->io, NULL );
+        if( addr->type == TR_AF_INET ) {
+            protocolSendPort( m, tr_dhtPort( torrent->session ) );
+        }
+    }
 
     tellPeerWhatWeHave( m );