fix netns for socks5 and relay handler

connector/direct/connector.go

@@ -44,9 +44,17 @@ func (c *directConnector) Connect(ctx context.Context, _ net.Conn, network, addr
 		return nil, err
 	}
 
+	var localAddr, remoteAddr string
+	if addr := conn.LocalAddr(); addr != nil {
+		localAddr = addr.String()
+	}
+	if addr := conn.RemoteAddr(); addr != nil {
+		remoteAddr = addr.String()
+	}
+
 	log := c.options.Logger.WithFields(map[string]any{
-		"remote":  conn.RemoteAddr().String(),
-		"local":   conn.LocalAddr().String(),
+		"remote":  remoteAddr,
+		"local":   localAddr,
 		"network": network,
 		"address": address,
 	})

connector/socks/v5/conn.go

@@ -69,6 +69,10 @@ func (c *udpRelayConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
 	if err = socksAddr.ParseFrom(addr.String()); err != nil {
 		return
 	}
+	if socksAddr.Host == "" {
+		socksAddr.Type = gosocks5.AddrIPv4
+		socksAddr.Host = "127.0.0.1"
+	}
 
 	header := gosocks5.UDPHeader{
 		Addr: &socksAddr,

connector/socks/v5/connector.go

@@ -130,6 +130,10 @@ func (c *socks5Connector) Connect(ctx context.Context, conn net.Conn, network, a
 		log.Error(err)
 		return nil, err
 	}
+	if addr.Host == "" {
+		addr.Type = gosocks5.AddrIPv4
+		addr.Host = "127.0.0.1"
+	}
 
 	req := gosocks5.NewRequest(gosocks5.CmdConnect, &addr)
 	log.Trace(req)
@@ -201,12 +205,12 @@ func (c *socks5Connector) relayUDP(ctx context.Context, conn net.Conn, addr net.
 	}
 	log.Trace(reply)
 
-	log.Debugf("bind on: %v", reply.Addr)
-
 	if reply.Rep != gosocks5.Succeeded {
 		return nil, errors.New("get socks5 UDP tunnel failure")
 	}
 
+	log.Debugf("bind on: %v", reply.Addr)
+
 	cc, err := opts.NetDialer.Dial(ctx, "udp", reply.Addr.String())
 	if err != nil {
 		return nil, err