fix: let quic-go works on outbound's packetConn

transport/tuic/conn.go

@@ -250,29 +250,7 @@ func (q *quicStreamPacketConn) WriteTo(p []byte, addr net.Addr) (n int, err erro
 }
 
 func (q *quicStreamPacketConn) LocalAddr() net.Addr {
-	addr := q.quicConn.LocalAddr()
-	if q.inputConn != nil { // client
-		return &packetAddr{addrStr: q.quicConn.LocalAddr().String(), connId: q.connId, rawAddr: addr}
-	}
-	return addr // server
+	return q.quicConn.LocalAddr()
 }
 
 var _ net.PacketConn = &quicStreamPacketConn{}
-
-type packetAddr struct {
-	addrStr string
-	connId  uint32
-	rawAddr net.Addr
-}
-
-func (a packetAddr) Network() string {
-	return "tuic"
-}
-
-func (a packetAddr) String() string {
-	return fmt.Sprintf("%s-%d", a.addrStr, a.connId)
-}
-
-func (a packetAddr) RawAddr() net.Addr {
-	return a.rawAddr
-}

transport/tuic/server.go

@@ -5,6 +5,7 @@ import (
 	"bytes"
 	"context"
 	"crypto/tls"
+	"fmt"
 	"net"
 	"sync"
 	"sync/atomic"
@@ -153,7 +154,7 @@ func (s *serverHandler) parsePacket(packet Packet, udpRelayMode string) (err err
 	return s.HandleUdpFn(packet.ADDR.SocksAddr(), &serverUDPPacket{
 		pc:     pc,
 		packet: &packet,
-		rAddr:  &packetAddr{addrStr: "tuic-" + s.uuid.String(), connId: assocId, rawAddr: s.quicConn.RemoteAddr()},
+		rAddr:  N.NewCustomAddr("tuic", fmt.Sprintf("tuic-%s-%d", s.uuid, assocId), s.quicConn.RemoteAddr()), // for tunnel's handleUDPConn
 	})
 }