From a1b95d499dffa5e8dc7917b2d70c1dc6ddc5cac5 Mon Sep 17 00:00:00 2001
From: Matt Joiner <anacrolix@gmail.com>
Date: Fri, 21 Mar 2014 00:12:53 +1100
Subject: [PATCH] Send port on announces when possible

---
 client.go | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/client.go b/client.go
index 1c02c25f..8d2ff066 100644
--- a/client.go
+++ b/client.go
@@ -976,10 +976,28 @@ func (me *Client) AddTorrent(metaInfo *metainfo.MetaInfo) error {
 	return nil
 }
 
+func (cl *Client) listenerAnnouncePort() (port int16) {
+	l := cl.Listener
+	if l == nil {
+		return
+	}
+	addr := l.Addr()
+	switch data := addr.(type) {
+	case *net.TCPAddr:
+		return int16(data.Port)
+	case *net.UDPAddr:
+		return int16(data.Port)
+	default:
+		log.Printf("unknown listener addr type: %T", addr)
+	}
+	return
+}
+
 func (cl *Client) announceTorrent(t *Torrent) {
 	req := tracker.AnnounceRequest{
 		Event:   tracker.Started,
 		NumWant: -1,
+		Port:    cl.listenerAnnouncePort(),
 	}
 	req.PeerId = cl.PeerId
 	req.InfoHash = t.InfoHash
-- 
2.48.1