mirror of https://github.com/XTLS/Xray-core.git
297 lines
9.8 KiB
Go
297 lines
9.8 KiB
Go
package outbound
|
|
|
|
//go:generate go run github.com/xtls/xray-core/common/errors/errorgen
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
gotls "crypto/tls"
|
|
"reflect"
|
|
"time"
|
|
"unsafe"
|
|
|
|
utls "github.com/refraction-networking/utls"
|
|
"github.com/xtls/xray-core/common"
|
|
"github.com/xtls/xray-core/common/buf"
|
|
"github.com/xtls/xray-core/common/net"
|
|
"github.com/xtls/xray-core/common/protocol"
|
|
"github.com/xtls/xray-core/common/retry"
|
|
"github.com/xtls/xray-core/common/session"
|
|
"github.com/xtls/xray-core/common/signal"
|
|
"github.com/xtls/xray-core/common/task"
|
|
"github.com/xtls/xray-core/common/xudp"
|
|
"github.com/xtls/xray-core/core"
|
|
"github.com/xtls/xray-core/features/policy"
|
|
"github.com/xtls/xray-core/proxy"
|
|
"github.com/xtls/xray-core/proxy/vless"
|
|
"github.com/xtls/xray-core/proxy/vless/encoding"
|
|
"github.com/xtls/xray-core/transport"
|
|
"github.com/xtls/xray-core/transport/internet"
|
|
"github.com/xtls/xray-core/transport/internet/reality"
|
|
"github.com/xtls/xray-core/transport/internet/stat"
|
|
"github.com/xtls/xray-core/transport/internet/tls"
|
|
)
|
|
|
|
func init() {
|
|
common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
|
|
return New(ctx, config.(*Config))
|
|
}))
|
|
}
|
|
|
|
// Handler is an outbound connection handler for VLess protocol.
|
|
type Handler struct {
|
|
serverList *protocol.ServerList
|
|
serverPicker protocol.ServerPicker
|
|
policyManager policy.Manager
|
|
cone bool
|
|
}
|
|
|
|
// 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),
|
|
cone: ctx.Value("cone").(bool),
|
|
}
|
|
|
|
return handler, nil
|
|
}
|
|
|
|
// Process implements proxy.Outbound.Process().
|
|
func (h *Handler) 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").AtError()
|
|
}
|
|
outbound.Name = "vless"
|
|
inbound := session.InboundFromContext(ctx)
|
|
|
|
var rec *protocol.ServerSpec
|
|
var conn stat.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
|
|
if statConn, ok := iConn.(*stat.CounterConnection); ok {
|
|
iConn = statConn.Connection
|
|
}
|
|
target := outbound.Target
|
|
newError("tunneling request to ", target, " via ", rec.Destination().NetAddr()).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 := &proxy.Addons{
|
|
Flow: account.Flow,
|
|
}
|
|
encoding.PopulateSeed(account.Seed, requestAddons)
|
|
|
|
var input *bytes.Reader
|
|
var rawInput *bytes.Buffer
|
|
allowUDP443 := false
|
|
switch requestAddons.Flow {
|
|
case vless.XRV + "-udp443":
|
|
allowUDP443 = true
|
|
requestAddons.Flow = requestAddons.Flow[:16]
|
|
fallthrough
|
|
case vless.XRV:
|
|
if inbound != nil {
|
|
inbound.SetCanSpliceCopy(2)
|
|
}
|
|
switch request.Command {
|
|
case protocol.RequestCommandUDP:
|
|
if !allowUDP443 && request.Port == 443 {
|
|
return newError("XTLS rejected UDP/443 traffic").AtInfo()
|
|
}
|
|
case protocol.RequestCommandMux:
|
|
fallthrough // let server break Mux connections that contain TCP requests
|
|
case protocol.RequestCommandTCP:
|
|
var t reflect.Type
|
|
var p uintptr
|
|
if tlsConn, ok := iConn.(*tls.Conn); ok {
|
|
t = reflect.TypeOf(tlsConn.Conn).Elem()
|
|
p = uintptr(unsafe.Pointer(tlsConn.Conn))
|
|
} else if utlsConn, ok := iConn.(*tls.UConn); ok {
|
|
t = reflect.TypeOf(utlsConn.Conn).Elem()
|
|
p = uintptr(unsafe.Pointer(utlsConn.Conn))
|
|
} else if realityConn, ok := iConn.(*reality.UConn); ok {
|
|
t = reflect.TypeOf(realityConn.Conn).Elem()
|
|
p = uintptr(unsafe.Pointer(realityConn.Conn))
|
|
} else {
|
|
return newError("XTLS only supports TLS and REALITY directly for now.").AtWarning()
|
|
}
|
|
i, _ := t.FieldByName("input")
|
|
r, _ := t.FieldByName("rawInput")
|
|
input = (*bytes.Reader)(unsafe.Pointer(p + i.Offset))
|
|
rawInput = (*bytes.Buffer)(unsafe.Pointer(p + r.Offset))
|
|
}
|
|
default:
|
|
if inbound != nil {
|
|
inbound.SetCanSpliceCopy(3)
|
|
}
|
|
}
|
|
|
|
var newCtx context.Context
|
|
var newCancel context.CancelFunc
|
|
if session.TimeoutOnlyFromContext(ctx) {
|
|
newCtx, newCancel = context.WithCancel(context.Background())
|
|
}
|
|
|
|
sessionPolicy := h.policyManager.ForLevel(request.User.Level)
|
|
ctx, cancel := context.WithCancel(ctx)
|
|
timer := signal.CancelAfterInactivity(ctx, func() {
|
|
cancel()
|
|
if newCancel != nil {
|
|
newCancel()
|
|
}
|
|
}, sessionPolicy.Timeouts.ConnectionIdle)
|
|
|
|
clientReader := link.Reader // .(*pipe.Reader)
|
|
clientWriter := link.Writer // .(*pipe.Writer)
|
|
trafficState := proxy.NewTrafficState(account.ID.Bytes(), account.Flow)
|
|
if request.Command == protocol.RequestCommandUDP && (requestAddons.Flow == vless.XRV || (h.cone && request.Port != 53 && request.Port != 443)) {
|
|
request.Command = protocol.RequestCommandMux
|
|
request.Address = net.DomainAddress("v1.mux.cool")
|
|
request.Port = net.Port(666)
|
|
}
|
|
|
|
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, trafficState, ctx)
|
|
if request.Command == protocol.RequestCommandMux && request.Port == 666 {
|
|
serverWriter = xudp.NewPacketWriter(serverWriter, target, xudp.GetGlobalID(ctx))
|
|
}
|
|
timeoutReader, ok := clientReader.(buf.TimeoutReader)
|
|
if ok {
|
|
multiBuffer, err1 := timeoutReader.ReadMultiBufferTimeout(time.Millisecond * 500)
|
|
if err1 == nil {
|
|
if err := serverWriter.WriteMultiBuffer(multiBuffer); err != nil {
|
|
return err // ...
|
|
}
|
|
} else if err1 != buf.ErrReadTimeout {
|
|
return err1
|
|
} else if requestAddons.Flow == vless.XRV {
|
|
mb := make(buf.MultiBuffer, 1)
|
|
newError("Insert padding with empty content to camouflage VLESS header ", mb.Len()).WriteToLog(session.ExportIDToError(ctx))
|
|
if err := serverWriter.WriteMultiBuffer(mb); err != nil {
|
|
return err // ...
|
|
}
|
|
}
|
|
} else {
|
|
newError("Reader is not timeout reader, will send out vless header separately from first payload").AtDebug().WriteToLog(session.ExportIDToError(ctx))
|
|
}
|
|
// 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()
|
|
}
|
|
|
|
var err error
|
|
if requestAddons.Flow == vless.XRV {
|
|
if tlsConn, ok := iConn.(*tls.Conn); ok {
|
|
if tlsConn.ConnectionState().Version != gotls.VersionTLS13 {
|
|
return newError(`failed to use `+requestAddons.Flow+`, found outer tls version `, tlsConn.ConnectionState().Version).AtWarning()
|
|
}
|
|
} else if utlsConn, ok := iConn.(*tls.UConn); ok {
|
|
if utlsConn.ConnectionState().Version != utls.VersionTLS13 {
|
|
return newError(`failed to use `+requestAddons.Flow+`, found outer tls version `, utlsConn.ConnectionState().Version).AtWarning()
|
|
}
|
|
}
|
|
ctx1 := session.ContextWithOutbound(ctx, nil) // TODO enable splice
|
|
err = encoding.XtlsWrite(clientReader, serverWriter, timer, conn, trafficState, ctx1)
|
|
} else {
|
|
// from clientReader.ReadMultiBuffer to serverWriter.WriteMultiBufer
|
|
err = buf.Copy(clientReader, serverWriter, buf.UpdateActivity(timer))
|
|
}
|
|
if 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, trafficState, ctx)
|
|
if request.Command == protocol.RequestCommandMux && request.Port == 666 {
|
|
serverReader = xudp.NewPacketReader(&buf.BufferedReader{Reader: serverReader})
|
|
}
|
|
|
|
if requestAddons.Flow == vless.XRV {
|
|
err = encoding.XtlsRead(serverReader, clientWriter, timer, conn, input, rawInput, trafficState, ctx)
|
|
} 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 newCtx != nil {
|
|
ctx = newCtx
|
|
}
|
|
|
|
if err := task.Run(ctx, postRequest, task.OnSuccess(getResponse, task.Close(clientWriter))); err != nil {
|
|
return newError("connection ends").Base(err).AtInfo()
|
|
}
|
|
|
|
return nil
|
|
}
|