From 12148c5d62514bcfc88b2c47a6a7a56a7774e3a3 Mon Sep 17 00:00:00 2001
From: cnderrauber <zengjie9004@gmail.com>
Date: Tue, 27 Sep 2022 14:12:52 +0800
Subject: [PATCH] Fix build failed on windows

Udp mux need retrieve destination address to dispatch received
packet when listen at Any address. Windows use winsock APIs to
get that, but conn.FD() is not implement for windows, so
dispatch packet to first candidate, not ideally, but it will
work for ice connectin, wasm will have same result too.
---
 udp_mux.go                                   | 11 +++++++++--
 udpmsghelper.go                              |  2 +-
 udpmsghelper_js.go => udpmsghelper_js_win.go |  2 +-
 3 files changed, 11 insertions(+), 4 deletions(-)
 rename udpmsghelper_js.go => udpmsghelper_js_win.go (92%)

diff --git a/udp_mux.go b/udp_mux.go
index f93a546..a477ead 100644
--- a/udp_mux.go
+++ b/udp_mux.go
@@ -365,12 +365,19 @@ func (m *UDPMuxDefault) connWorker() { //nolint:gocognit
 		var destinationConn *udpMuxedConn
 		m.addressMapMu.Lock()
 		if conns, ok := m.addressMap[addr.String()]; ok {
-			destinationConn = conns[ipAddr(localHost.String())]
+			if localHost.IsUnspecified() {
+				for _, c := range conns {
+					destinationConn = c
+					break
+				}
+			} else {
+				destinationConn = conns[ipAddr(localHost.String())]
+			}
 		}
 		m.addressMapMu.Unlock()
 
 		// If we haven't seen this address before but is a STUN packet lookup by ufrag
-		if destinationConn == nil && stun.IsMessage(buf[:n]) {
+		if destinationConn == nil && stun.IsMessage(buf[:n]) && !localHost.IsUnspecified() {
 			msg := &stun.Message{
 				Raw: append([]byte{}, buf[:n]...),
 			}
diff --git a/udpmsghelper.go b/udpmsghelper.go
index b5b95d5..51efa36 100644
--- a/udpmsghelper.go
+++ b/udpmsghelper.go
@@ -1,4 +1,4 @@
-//go:build !js
+//go:build !js && !windows
 
 package ice
 
diff --git a/udpmsghelper_js.go b/udpmsghelper_js_win.go
similarity index 92%
rename from udpmsghelper_js.go
rename to udpmsghelper_js_win.go
index e55911a..51c990a 100644
--- a/udpmsghelper_js.go
+++ b/udpmsghelper_js_win.go
@@ -1,4 +1,4 @@
-//go:build js
+//go:build js || windows
 
 package ice