merge ss and ssu

pkg/handler/ss/udp.go

@@ -0,0 +1,226 @@
+package ss
+
+import (
+	"context"
+	"net"
+	"time"
+
+	"github.com/go-gost/gost/pkg/handler"
+	"github.com/go-gost/gost/pkg/internal/bufpool"
+	"github.com/go-gost/gost/pkg/internal/utils/socks"
+	"github.com/go-gost/gost/pkg/internal/utils/ss"
+)
+
+func (h *ssHandler) handleUDP(ctx context.Context, raddr net.Addr, conn net.PacketConn) {
+	if h.md.cipher != nil {
+		conn = h.md.cipher.PacketConn(conn)
+	}
+
+	// obtain a udp connection
+	r := (&handler.Router{}).
+		WithChain(h.chain).
+		WithRetry(h.md.retryCount).
+		WithLogger(h.logger)
+	c, err := r.Dial(ctx, "udp", "")
+	if err != nil {
+		h.logger.Error(err)
+		return
+	}
+
+	cc, ok := c.(net.PacketConn)
+	if !ok {
+		h.logger.Errorf("%s: not a packet connection")
+		return
+	}
+	defer cc.Close()
+
+	h.logger = h.logger.WithFields(map[string]interface{}{
+		"bind": cc.LocalAddr().String(),
+	})
+	h.logger.Infof("bind on %s OK", cc.LocalAddr().String())
+	t := time.Now()
+	h.logger.Infof("%s <-> %s", raddr, cc.LocalAddr())
+	h.relayPacket(
+		ss.UDPServerConn(conn, raddr, h.md.bufferSize),
+		cc,
+	)
+	h.logger.
+		WithFields(map[string]interface{}{"duration": time.Since(t)}).
+		Infof("%s >-< %s", raddr, cc.LocalAddr())
+}
+
+func (h *ssHandler) handleUDPTun(ctx context.Context, conn net.Conn) {
+	// obtain a udp connection
+	r := (&handler.Router{}).
+		WithChain(h.chain).
+		WithRetry(h.md.retryCount).
+		WithLogger(h.logger)
+	c, err := r.Dial(ctx, "udp", "")
+	if err != nil {
+		h.logger.Error(err)
+		return
+	}
+
+	cc, ok := c.(net.PacketConn)
+	if !ok {
+		h.logger.Errorf("%s: not a packet connection")
+		return
+	}
+	defer cc.Close()
+
+	h.logger = h.logger.WithFields(map[string]interface{}{
+		"bind": cc.LocalAddr().String(),
+	})
+	h.logger.Infof("bind on %s OK", cc.LocalAddr().String())
+
+	t := time.Now()
+	h.logger.Infof("%s <-> %s", conn.RemoteAddr(), cc.LocalAddr())
+	h.tunnelUDP(socks.UDPTunServerConn(conn), cc)
+	h.logger.
+		WithFields(map[string]interface{}{"duration": time.Since(t)}).
+		Infof("%s >-< %s", conn.RemoteAddr(), cc.LocalAddr())
+}
+
+func (h *ssHandler) relayPacket(pc1, pc2 net.PacketConn) (err error) {
+	bufSize := h.md.bufferSize
+	errc := make(chan error, 2)
+
+	go func() {
+		for {
+			err := func() error {
+				b := bufpool.Get(bufSize)
+				defer bufpool.Put(b)
+
+				n, addr, err := pc1.ReadFrom(b)
+				if err != nil {
+					return err
+				}
+
+				if h.bypass != nil && h.bypass.Contains(addr.String()) {
+					h.logger.Warn("bypass: ", addr)
+					return nil
+				}
+
+				if _, err = pc2.WriteTo(b[:n], addr); err != nil {
+					return err
+				}
+
+				h.logger.Debugf("%s >>> %s data: %d",
+					pc2.LocalAddr(), addr, n)
+				return nil
+			}()
+
+			if err != nil {
+				errc <- err
+				return
+			}
+		}
+	}()
+
+	go func() {
+		for {
+			err := func() error {
+				b := bufpool.Get(bufSize)
+				defer bufpool.Put(b)
+
+				n, raddr, err := pc2.ReadFrom(b)
+				if err != nil {
+					return err
+				}
+
+				if h.bypass != nil && h.bypass.Contains(raddr.String()) {
+					h.logger.Warn("bypass: ", raddr)
+					return nil
+				}
+
+				if _, err = pc1.WriteTo(b[:n], raddr); err != nil {
+					return err
+				}
+
+				h.logger.Debugf("%s <<< %s data: %d",
+					pc2.LocalAddr(), raddr, n)
+				return nil
+			}()
+
+			if err != nil {
+				errc <- err
+				return
+			}
+		}
+	}()
+
+	return <-errc
+}
+
+func (h *ssHandler) tunnelUDP(tunnel, c net.PacketConn) (err error) {
+	bufSize := h.md.bufferSize
+	errc := make(chan error, 2)
+
+	go func() {
+		b := bufpool.Get(bufSize)
+		defer bufpool.Put(b)
+
+		for {
+			err := func() error {
+				n, addr, err := tunnel.ReadFrom(b)
+				if err != nil {
+					return err
+				}
+
+				if h.bypass != nil && h.bypass.Contains(addr.String()) {
+					h.logger.Warn("bypass: ", addr.String())
+					return nil // bypass
+				}
+
+				if _, err := c.WriteTo(b[:n], addr); err != nil {
+					return err
+				}
+
+				h.logger.Debugf("%s >>> %s data: %d",
+					c.LocalAddr(), addr, n)
+
+				return nil
+			}()
+
+			if err != nil {
+				errc <- err
+				return
+			}
+		}
+	}()
+
+	go func() {
+		b := bufpool.Get(bufSize)
+		defer bufpool.Put(b)
+
+		for {
+			err := func() error {
+				n, raddr, err := c.ReadFrom(b)
+				if err != nil {
+					return err
+				}
+
+				if h.bypass != nil && h.bypass.Contains(raddr.String()) {
+					h.logger.Warn("bypass: ", raddr.String())
+					return nil // bypass
+				}
+
+				if _, err := tunnel.WriteTo(b[:n], raddr); err != nil {
+					return err
+				}
+
+				h.logger.Debugf("%s <<< %s data: %d",
+					c.LocalAddr(), raddr, n)
+
+				return nil
+			}()
+
+			if err != nil {
+				errc <- err
+				return
+			}
+		}
+	}()
+
+	return <-errc
+}