add pkgs from core

handler/socks/v5/udp_tun.go

@@ -0,0 +1,72 @@
+package v5
+
+import (
+	"context"
+	"net"
+	"time"
+
+	"github.com/go-gost/core/common/net/relay"
+	"github.com/go-gost/core/logger"
+	"github.com/go-gost/gosocks5"
+	"github.com/go-gost/x/internal/util/socks"
+)
+
+func (h *socks5Handler) handleUDPTun(ctx context.Context, conn net.Conn, network, address string, log logger.Logger) error {
+	log = log.WithFields(map[string]any{
+		"cmd": "udp-tun",
+	})
+
+	bindAddr, _ := net.ResolveUDPAddr(network, address)
+	if bindAddr == nil {
+		bindAddr = &net.UDPAddr{}
+	}
+
+	if bindAddr.Port == 0 {
+		// relay mode
+		if !h.md.enableUDP {
+			reply := gosocks5.NewReply(gosocks5.NotAllowed, nil)
+			log.Debug(reply)
+			log.Error("socks5: UDP relay is disabled")
+			return reply.Write(conn)
+		}
+	} else {
+		// BIND mode
+		if !h.md.enableBind {
+			reply := gosocks5.NewReply(gosocks5.NotAllowed, nil)
+			log.Debug(reply)
+			log.Error("socks5: BIND is disabled")
+			return reply.Write(conn)
+		}
+	}
+
+	pc, err := net.ListenUDP(network, bindAddr)
+	if err != nil {
+		log.Error(err)
+		return err
+	}
+	defer pc.Close()
+
+	saddr := gosocks5.Addr{}
+	saddr.ParseFrom(pc.LocalAddr().String())
+	reply := gosocks5.NewReply(gosocks5.Succeeded, &saddr)
+	if err := reply.Write(conn); err != nil {
+		log.Error(err)
+		return err
+	}
+	log.Debug(reply)
+	log.Debugf("bind on %s OK", pc.LocalAddr())
+
+	r := relay.NewUDPRelay(socks.UDPTunServerConn(conn), pc).
+		WithBypass(h.options.Bypass).
+		WithLogger(log)
+	r.SetBufferSize(h.md.udpBufferSize)
+
+	t := time.Now()
+	log.Infof("%s <-> %s", conn.RemoteAddr(), pc.LocalAddr())
+	r.Run()
+	log.WithFields(map[string]any{
+		"duration": time.Since(t),
+	}).Infof("%s >-< %s", conn.RemoteAddr(), pc.LocalAddr())
+
+	return nil
+}