v1.0.0

proxy/socks/client.go

@@ -0,0 +1,154 @@
+// +build !confonly
+
+package socks
+
+import (
+	"context"
+	"time"
+
+	"github.com/xtls/xray-core/v1/common"
+	"github.com/xtls/xray-core/v1/common/buf"
+	"github.com/xtls/xray-core/v1/common/net"
+	"github.com/xtls/xray-core/v1/common/protocol"
+	"github.com/xtls/xray-core/v1/common/retry"
+	"github.com/xtls/xray-core/v1/common/session"
+	"github.com/xtls/xray-core/v1/common/signal"
+	"github.com/xtls/xray-core/v1/common/task"
+	"github.com/xtls/xray-core/v1/core"
+	"github.com/xtls/xray-core/v1/features/policy"
+	"github.com/xtls/xray-core/v1/transport"
+	"github.com/xtls/xray-core/v1/transport/internet"
+)
+
+// Client is a Socks5 client.
+type Client struct {
+	serverPicker  protocol.ServerPicker
+	policyManager policy.Manager
+}
+
+// NewClient create a new Socks5 client based on the given config.
+func NewClient(ctx context.Context, config *ClientConfig) (*Client, error) {
+	serverList := protocol.NewServerList()
+	for _, rec := range config.Server {
+		s, err := protocol.NewServerSpecFromPB(rec)
+		if err != nil {
+			return nil, newError("failed to get server spec").Base(err)
+		}
+		serverList.AddServer(s)
+	}
+	if serverList.Size() == 0 {
+		return nil, newError("0 target server")
+	}
+
+	v := core.MustFromContext(ctx)
+	return &Client{
+		serverPicker:  protocol.NewRoundRobinServerPicker(serverList),
+		policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
+	}, nil
+}
+
+// Process implements proxy.Outbound.Process.
+func (c *Client) Process(ctx context.Context, link *transport.Link, dialer internet.Dialer) error {
+	outbound := session.OutboundFromContext(ctx)
+	if outbound == nil || !outbound.Target.IsValid() {
+		return newError("target not specified.")
+	}
+	destination := outbound.Target
+
+	var server *protocol.ServerSpec
+	var conn internet.Connection
+
+	if err := retry.ExponentialBackoff(5, 100).On(func() error {
+		server = c.serverPicker.PickServer()
+		dest := server.Destination()
+		rawConn, err := dialer.Dial(ctx, dest)
+		if err != nil {
+			return err
+		}
+		conn = rawConn
+
+		return nil
+	}); err != nil {
+		return newError("failed to find an available destination").Base(err)
+	}
+
+	defer func() {
+		if err := conn.Close(); err != nil {
+			newError("failed to closed connection").Base(err).WriteToLog(session.ExportIDToError(ctx))
+		}
+	}()
+
+	p := c.policyManager.ForLevel(0)
+
+	request := &protocol.RequestHeader{
+		Version: socks5Version,
+		Command: protocol.RequestCommandTCP,
+		Address: destination.Address,
+		Port:    destination.Port,
+	}
+	if destination.Network == net.Network_UDP {
+		request.Command = protocol.RequestCommandUDP
+	}
+
+	user := server.PickUser()
+	if user != nil {
+		request.User = user
+		p = c.policyManager.ForLevel(user.Level)
+	}
+
+	if err := conn.SetDeadline(time.Now().Add(p.Timeouts.Handshake)); err != nil {
+		newError("failed to set deadline for handshake").Base(err).WriteToLog(session.ExportIDToError(ctx))
+	}
+	udpRequest, err := ClientHandshake(request, conn, conn)
+	if err != nil {
+		return newError("failed to establish connection to server").AtWarning().Base(err)
+	}
+
+	if err := conn.SetDeadline(time.Time{}); err != nil {
+		newError("failed to clear deadline after handshake").Base(err).WriteToLog(session.ExportIDToError(ctx))
+	}
+
+	ctx, cancel := context.WithCancel(ctx)
+	timer := signal.CancelAfterInactivity(ctx, cancel, p.Timeouts.ConnectionIdle)
+
+	var requestFunc func() error
+	var responseFunc func() error
+	if request.Command == protocol.RequestCommandTCP {
+		requestFunc = func() error {
+			defer timer.SetTimeout(p.Timeouts.DownlinkOnly)
+			return buf.Copy(link.Reader, buf.NewWriter(conn), buf.UpdateActivity(timer))
+		}
+		responseFunc = func() error {
+			defer timer.SetTimeout(p.Timeouts.UplinkOnly)
+			return buf.Copy(buf.NewReader(conn), link.Writer, buf.UpdateActivity(timer))
+		}
+	} else if request.Command == protocol.RequestCommandUDP {
+		udpConn, err := dialer.Dial(ctx, udpRequest.Destination())
+		if err != nil {
+			return newError("failed to create UDP connection").Base(err)
+		}
+		defer udpConn.Close()
+		requestFunc = func() error {
+			defer timer.SetTimeout(p.Timeouts.DownlinkOnly)
+			return buf.Copy(link.Reader, &buf.SequentialWriter{Writer: NewUDPWriter(request, udpConn)}, buf.UpdateActivity(timer))
+		}
+		responseFunc = func() error {
+			defer timer.SetTimeout(p.Timeouts.UplinkOnly)
+			reader := &UDPReader{reader: udpConn}
+			return buf.Copy(reader, link.Writer, buf.UpdateActivity(timer))
+		}
+	}
+
+	var responseDonePost = task.OnSuccess(responseFunc, task.Close(link.Writer))
+	if err := task.Run(ctx, requestFunc, responseDonePost); err != nil {
+		return newError("connection ends").Base(err)
+	}
+
+	return nil
+}
+
+func init() {
+	common.Must(common.RegisterConfig((*ClientConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
+		return NewClient(ctx, config.(*ClientConfig))
+	}))
+}