v1.0.0

proxy/vless/outbound/outbound.go

@@ -0,0 +1,240 @@
+// +build !confonly
+
+package outbound
+
+//go:generate go run github.com/xtls/xray-core/v1/common/errors/errorgen
+
+import (
+	"context"
+	"syscall"
+	"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/platform"
+	"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"
+	core "github.com/xtls/xray-core/v1/core"
+	"github.com/xtls/xray-core/v1/features/policy"
+	"github.com/xtls/xray-core/v1/features/stats"
+	"github.com/xtls/xray-core/v1/proxy/vless"
+	"github.com/xtls/xray-core/v1/proxy/vless/encoding"
+	"github.com/xtls/xray-core/v1/transport"
+	"github.com/xtls/xray-core/v1/transport/internet"
+	"github.com/xtls/xray-core/v1/transport/internet/xtls"
+)
+
+var (
+	xtls_show = false
+)
+
+func init() {
+	common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
+		return New(ctx, config.(*Config))
+	}))
+
+	const defaultFlagValue = "NOT_DEFINED_AT_ALL"
+
+	xtlsShow := platform.NewEnvFlag("xray.vless.xtls.show").GetValue(func() string { return defaultFlagValue })
+	if xtlsShow == "true" {
+		xtls_show = true
+	}
+}
+
+// Handler is an outbound connection handler for VLess protocol.
+type Handler struct {
+	serverList    *protocol.ServerList
+	serverPicker  protocol.ServerPicker
+	policyManager policy.Manager
+}
+
+// New creates a new VLess outbound handler.
+func New(ctx context.Context, config *Config) (*Handler, error) {
+	serverList := protocol.NewServerList()
+	for _, rec := range config.Vnext {
+		s, err := protocol.NewServerSpecFromPB(rec)
+		if err != nil {
+			return nil, newError("failed to parse server spec").Base(err).AtError()
+		}
+		serverList.AddServer(s)
+	}
+
+	v := core.MustFromContext(ctx)
+	handler := &Handler{
+		serverList:    serverList,
+		serverPicker:  protocol.NewRoundRobinServerPicker(serverList),
+		policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
+	}
+
+	return handler, nil
+}
+
+// Process implements proxy.Outbound.Process().
+func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer internet.Dialer) error {
+	var rec *protocol.ServerSpec
+	var conn internet.Connection
+
+	if err := retry.ExponentialBackoff(5, 200).On(func() error {
+		rec = h.serverPicker.PickServer()
+		var err error
+		conn, err = dialer.Dial(ctx, rec.Destination())
+		if err != nil {
+			return err
+		}
+		return nil
+	}); err != nil {
+		return newError("failed to find an available destination").Base(err).AtWarning()
+	}
+	defer conn.Close()
+
+	iConn := conn
+	statConn, ok := iConn.(*internet.StatCouterConnection)
+	if ok {
+		iConn = statConn.Connection
+	}
+
+	outbound := session.OutboundFromContext(ctx)
+	if outbound == nil || !outbound.Target.IsValid() {
+		return newError("target not specified").AtError()
+	}
+
+	target := outbound.Target
+	newError("tunneling request to ", target, " via ", rec.Destination()).AtInfo().WriteToLog(session.ExportIDToError(ctx))
+
+	command := protocol.RequestCommandTCP
+	if target.Network == net.Network_UDP {
+		command = protocol.RequestCommandUDP
+	}
+	if target.Address.Family().IsDomain() && target.Address.Domain() == "v1.mux.cool" {
+		command = protocol.RequestCommandMux
+	}
+
+	request := &protocol.RequestHeader{
+		Version: encoding.Version,
+		User:    rec.PickUser(),
+		Command: command,
+		Address: target.Address,
+		Port:    target.Port,
+	}
+
+	account := request.User.Account.(*vless.MemoryAccount)
+
+	requestAddons := &encoding.Addons{
+		Flow: account.Flow,
+	}
+
+	var rawConn syscall.RawConn
+
+	allowUDP443 := false
+	switch requestAddons.Flow {
+	case vless.XRO + "-udp443", vless.XRD + "-udp443":
+		allowUDP443 = true
+		requestAddons.Flow = requestAddons.Flow[:16]
+		fallthrough
+	case vless.XRO, vless.XRD:
+		switch request.Command {
+		case protocol.RequestCommandMux:
+			return newError(requestAddons.Flow + " doesn't support Mux").AtWarning()
+		case protocol.RequestCommandUDP:
+			if !allowUDP443 && request.Port == 443 {
+				return newError(requestAddons.Flow + " stopped UDP/443").AtInfo()
+			}
+			requestAddons.Flow = ""
+		case protocol.RequestCommandTCP:
+			if xtlsConn, ok := iConn.(*xtls.Conn); ok {
+				xtlsConn.RPRX = true
+				xtlsConn.SHOW = xtls_show
+				xtlsConn.MARK = "XTLS"
+				if requestAddons.Flow == vless.XRD {
+					xtlsConn.DirectMode = true
+					if sc, ok := xtlsConn.Connection.(syscall.Conn); ok {
+						rawConn, _ = sc.SyscallConn()
+					}
+				}
+			} else {
+				return newError(`failed to use ` + requestAddons.Flow + `, maybe "security" is not "xtls"`).AtWarning()
+			}
+		}
+	default:
+		if _, ok := iConn.(*xtls.Conn); ok {
+			panic(`To avoid misunderstanding, you must fill in VLESS "flow" when using XTLS.`)
+		}
+	}
+
+	sessionPolicy := h.policyManager.ForLevel(request.User.Level)
+	ctx, cancel := context.WithCancel(ctx)
+	timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle)
+
+	clientReader := link.Reader // .(*pipe.Reader)
+	clientWriter := link.Writer // .(*pipe.Writer)
+
+	postRequest := func() error {
+		defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
+
+		bufferWriter := buf.NewBufferedWriter(buf.NewWriter(conn))
+		if err := encoding.EncodeRequestHeader(bufferWriter, request, requestAddons); err != nil {
+			return newError("failed to encode request header").Base(err).AtWarning()
+		}
+
+		// default: serverWriter := bufferWriter
+		serverWriter := encoding.EncodeBodyAddons(bufferWriter, request, requestAddons)
+		if err := buf.CopyOnceTimeout(clientReader, serverWriter, time.Millisecond*100); err != nil && err != buf.ErrNotTimeoutReader && err != buf.ErrReadTimeout {
+			return err // ...
+		}
+
+		// Flush; bufferWriter.WriteMultiBufer now is bufferWriter.writer.WriteMultiBuffer
+		if err := bufferWriter.SetBuffered(false); err != nil {
+			return newError("failed to write A request payload").Base(err).AtWarning()
+		}
+
+		// from clientReader.ReadMultiBuffer to serverWriter.WriteMultiBufer
+		if err := buf.Copy(clientReader, serverWriter, buf.UpdateActivity(timer)); err != nil {
+			return newError("failed to transfer request payload").Base(err).AtInfo()
+		}
+
+		// Indicates the end of request payload.
+		switch requestAddons.Flow {
+		default:
+		}
+		return nil
+	}
+
+	getResponse := func() error {
+		defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
+
+		responseAddons, err := encoding.DecodeResponseHeader(conn, request)
+		if err != nil {
+			return newError("failed to decode response header").Base(err).AtInfo()
+		}
+
+		// default: serverReader := buf.NewReader(conn)
+		serverReader := encoding.DecodeBodyAddons(conn, request, responseAddons)
+
+		if rawConn != nil {
+			var counter stats.Counter
+			if statConn != nil {
+				counter = statConn.ReadCounter
+			}
+			err = encoding.ReadV(serverReader, clientWriter, timer, iConn.(*xtls.Conn), rawConn, counter)
+		} else {
+			// from serverReader.ReadMultiBuffer to clientWriter.WriteMultiBufer
+			err = buf.Copy(serverReader, clientWriter, buf.UpdateActivity(timer))
+		}
+
+		if err != nil {
+			return newError("failed to transfer response payload").Base(err).AtInfo()
+		}
+
+		return nil
+	}
+
+	if err := task.Run(ctx, postRequest, task.OnSuccess(getResponse, task.Close(clientWriter))); err != nil {
+		return newError("connection ends").Base(err).AtInfo()
+	}
+
+	return nil
+}