From 10dcb7a3ada4a3f197d2348f1cb893aebe88a5b7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=B1=9F=E6=B9=96=E9=A3=8E=E8=BD=BB?= <490021209@qq.com>
Date: Thu, 11 May 2023 18:42:24 +0800
Subject: [PATCH] Fix: PacketConn's internal remote address is overwritten
 (#2727)

When using vmess + fake-ip, after receiving the first UDP response,
PacketConn's internal address will be rewritten to fake-ip, causing all
subsequent sending operations to return "ErrUDPRemoteAddrMismatch".

Signed-off-by: Hackerl <490021209@qq.com>
---
 tunnel/connection.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tunnel/connection.go b/tunnel/connection.go
index 0614603..c220908 100644
--- a/tunnel/connection.go
+++ b/tunnel/connection.go
@@ -39,7 +39,7 @@ func handleUDPToLocal(packet C.UDPPacket, pc net.PacketConn, key string, oAddr,
 			return
 		}
 
-		fromUDPAddr := from.(*net.UDPAddr)
+		fromUDPAddr := *from.(*net.UDPAddr)
 		if fAddr.IsValid() {
 			fromAddr, _ := netip.AddrFromSlice(fromUDPAddr.IP)
 			fromAddr = fromAddr.Unmap()
@@ -48,7 +48,7 @@ func handleUDPToLocal(packet C.UDPPacket, pc net.PacketConn, key string, oAddr,
 			}
 		}
 
-		_, err = packet.WriteBack(buf[:n], fromUDPAddr)
+		_, err = packet.WriteBack(buf[:n], &fromUDPAddr)
 		if err != nil {
 			return
 		}