add pkgs from core

connector/socks/v5/bind.go

@@ -0,0 +1,133 @@
+package v5
+
+import (
+	"context"
+	"fmt"
+	"net"
+
+	"github.com/go-gost/core/common/net/udp"
+	"github.com/go-gost/core/connector"
+	"github.com/go-gost/core/logger"
+	"github.com/go-gost/gosocks5"
+	"github.com/go-gost/x/internal/util/mux"
+	"github.com/go-gost/x/internal/util/socks"
+)
+
+// Bind implements connector.Binder.
+func (c *socks5Connector) Bind(ctx context.Context, conn net.Conn, network, address string, opts ...connector.BindOption) (net.Listener, error) {
+	log := c.options.Logger.WithFields(map[string]any{
+		"remote":  conn.RemoteAddr().String(),
+		"local":   conn.LocalAddr().String(),
+		"network": network,
+		"address": address,
+	})
+	log.Infof("bind on %s/%s", address, network)
+
+	options := connector.BindOptions{}
+	for _, opt := range opts {
+		opt(&options)
+	}
+
+	switch network {
+	case "tcp", "tcp4", "tcp6":
+		if options.Mux {
+			return c.muxBindTCP(ctx, conn, network, address, log)
+		}
+		return c.bindTCP(ctx, conn, network, address, log)
+	case "udp", "udp4", "udp6":
+		return c.bindUDP(ctx, conn, network, address, &options, log)
+	default:
+		err := fmt.Errorf("network %s is unsupported", network)
+		log.Error(err)
+		return nil, err
+	}
+}
+
+func (c *socks5Connector) bindTCP(ctx context.Context, conn net.Conn, network, address string, log logger.Logger) (net.Listener, error) {
+	laddr, err := c.bind(conn, gosocks5.CmdBind, network, address, log)
+	if err != nil {
+		return nil, err
+	}
+
+	return &tcpListener{
+		addr:   laddr,
+		conn:   conn,
+		logger: log,
+	}, nil
+}
+
+func (c *socks5Connector) muxBindTCP(ctx context.Context, conn net.Conn, network, address string, log logger.Logger) (net.Listener, error) {
+	laddr, err := c.bind(conn, socks.CmdMuxBind, network, address, log)
+	if err != nil {
+		return nil, err
+	}
+
+	session, err := mux.ServerSession(conn)
+	if err != nil {
+		return nil, err
+	}
+
+	return &tcpMuxListener{
+		addr:    laddr,
+		session: session,
+		logger:  log,
+	}, nil
+}
+
+func (c *socks5Connector) bindUDP(ctx context.Context, conn net.Conn, network, address string, opts *connector.BindOptions, log logger.Logger) (net.Listener, error) {
+	laddr, err := c.bind(conn, socks.CmdUDPTun, network, address, log)
+	if err != nil {
+		return nil, err
+	}
+
+	ln := udp.NewListener(socks.UDPTunClientPacketConn(conn),
+		&udp.ListenConfig{
+			Addr:           laddr,
+			Backlog:        opts.Backlog,
+			ReadQueueSize:  opts.UDPDataQueueSize,
+			ReadBufferSize: opts.UDPDataBufferSize,
+			TTL:            opts.UDPConnTTL,
+			KeepAlive:      true,
+			Logger:         log,
+		})
+
+	return ln, nil
+}
+
+func (l *socks5Connector) bind(conn net.Conn, cmd uint8, network, address string, log logger.Logger) (net.Addr, error) {
+	addr := gosocks5.Addr{}
+	addr.ParseFrom(address)
+	req := gosocks5.NewRequest(cmd, &addr)
+	if err := req.Write(conn); err != nil {
+		return nil, err
+	}
+	log.Debug(req)
+
+	// first reply, bind status
+	reply, err := gosocks5.ReadReply(conn)
+	if err != nil {
+		return nil, err
+	}
+
+	log.Debug(reply)
+
+	if reply.Rep != gosocks5.Succeeded {
+		return nil, fmt.Errorf("bind on %s/%s failed", address, network)
+	}
+
+	var baddr net.Addr
+	switch network {
+	case "tcp", "tcp4", "tcp6":
+		baddr, err = net.ResolveTCPAddr(network, reply.Addr.String())
+	case "udp", "udp4", "udp6":
+		baddr, err = net.ResolveUDPAddr(network, reply.Addr.String())
+	default:
+		err = fmt.Errorf("unknown network %s", network)
+	}
+	if err != nil {
+		return nil, err
+	}
+	log.Debugf("bind on %s/%s OK", baddr, baddr.Network())
+
+	return baddr, nil
+}