add bind for relay

pkg/handler/relay/connect.go

@@ -0,0 +1,70 @@
+package relay
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"time"
+
+	"github.com/go-gost/gost/pkg/chain"
+	util_relay "github.com/go-gost/gost/pkg/common/util/relay"
+	"github.com/go-gost/gost/pkg/handler"
+	"github.com/go-gost/relay"
+)
+
+func (h *relayHandler) handleConnect(ctx context.Context, conn net.Conn, network, address string) {
+	h.logger = h.logger.WithFields(map[string]interface{}{
+		"dst": fmt.Sprintf("%s/%s", address, network),
+		"cmd": "connect",
+	})
+
+	h.logger.Infof("%s >> %s", conn.RemoteAddr(), address)
+
+	resp := relay.Response{
+		Version: relay.Version1,
+		Status:  relay.StatusOK,
+	}
+
+	if address == "" {
+		resp.Status = relay.StatusBadRequest
+		resp.WriteTo(conn)
+		h.logger.Error("target not specified")
+		return
+	}
+
+	if h.bypass != nil && h.bypass.Contains(address) {
+		h.logger.Info("bypass: ", address)
+		resp.Status = relay.StatusForbidden
+		resp.WriteTo(conn)
+		return
+	}
+
+	r := (&chain.Router{}).
+		WithChain(h.chain).
+		WithRetry(h.md.retryCount).
+		WithLogger(h.logger)
+	cc, err := r.Dial(ctx, network, address)
+	if err != nil {
+		resp.Status = relay.StatusNetworkUnreachable
+		resp.WriteTo(conn)
+		return
+	}
+	defer cc.Close()
+
+	if _, err := resp.WriteTo(conn); err != nil {
+		h.logger.Error(err)
+	}
+
+	if network == "udp" {
+		conn = util_relay.UDPTunConn(conn)
+	}
+
+	t := time.Now()
+	h.logger.Infof("%s <-> %s", conn.RemoteAddr(), address)
+	handler.Transport(conn, cc)
+	h.logger.
+		WithFields(map[string]interface{}{
+			"duration": time.Since(t),
+		}).
+		Infof("%s >-< %s", conn.RemoteAddr(), address)
+}