Xray-core/proxy/vless/outbound/outbound.go

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package outbound
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//go:generate go run github.com/xtls/xray-core/common/errors/errorgen
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import (
"context"
"syscall"
"time"
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"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/platform"
"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"
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core "github.com/xtls/xray-core/core"
"github.com/xtls/xray-core/features/policy"
"github.com/xtls/xray-core/features/stats"
"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/xtls"
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)
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
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var sctx context.Context
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allowUDP443 := false
switch requestAddons.Flow {
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case vless.XRO + "-udp443", vless.XRD + "-udp443", vless.XRS + "-udp443":
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allowUDP443 = true
requestAddons.Flow = requestAddons.Flow[:16]
fallthrough
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case vless.XRO, vless.XRD, vless.XRS:
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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"
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if requestAddons.Flow == vless.XRS {
sctx = ctx
requestAddons.Flow = vless.XRD
}
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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)
if request.Command == protocol.RequestCommandUDP {
request.Command = protocol.RequestCommandMux
request.Address = net.DomainAddress("v1.mux.cool")
request.Port = net.Port(666)
}
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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 request.Command == protocol.RequestCommandMux && request.Port == 666 {
serverWriter = xudp.NewPacketWriter(serverWriter, target)
}
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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 request.Command == protocol.RequestCommandMux && request.Port == 666 {
serverReader = xudp.NewPacketReader(conn)
}
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if rawConn != nil {
var counter stats.Counter
if statConn != nil {
counter = statConn.ReadCounter
}
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err = encoding.ReadV(serverReader, clientWriter, timer, iConn.(*xtls.Conn), rawConn, counter, sctx)
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} 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
}