mirror of https://github.com/XTLS/Xray-core
253 lines
7.6 KiB
Go
253 lines
7.6 KiB
Go
package outbound
|
|
|
|
//go:generate go run github.com/xtls/xray-core/common/errors/errorgen
|
|
|
|
import (
|
|
"context"
|
|
"crypto/hmac"
|
|
"crypto/sha256"
|
|
"hash/crc64"
|
|
"time"
|
|
|
|
"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"
|
|
core "github.com/xtls/xray-core/core"
|
|
"github.com/xtls/xray-core/features/policy"
|
|
"github.com/xtls/xray-core/proxy/vmess"
|
|
"github.com/xtls/xray-core/proxy/vmess/encoding"
|
|
"github.com/xtls/xray-core/transport"
|
|
"github.com/xtls/xray-core/transport/internet"
|
|
"github.com/xtls/xray-core/transport/internet/stat"
|
|
)
|
|
|
|
// Handler is an outbound connection handler for VMess protocol.
|
|
type Handler struct {
|
|
serverList *protocol.ServerList
|
|
serverPicker protocol.ServerPicker
|
|
policyManager policy.Manager
|
|
cone bool
|
|
}
|
|
|
|
// New creates a new VMess outbound handler.
|
|
func New(ctx context.Context, config *Config) (*Handler, error) {
|
|
serverList := protocol.NewServerList()
|
|
for _, rec := range config.Receiver {
|
|
s, err := protocol.NewServerSpecFromPB(rec)
|
|
if err != nil {
|
|
return nil, newError("failed to parse server spec").Base(err)
|
|
}
|
|
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 = "vmess"
|
|
inbound := session.InboundFromContext(ctx)
|
|
if inbound != nil {
|
|
inbound.SetCanSpliceCopy(3)
|
|
}
|
|
|
|
var rec *protocol.ServerSpec
|
|
var conn stat.Connection
|
|
err := retry.ExponentialBackoff(5, 200).On(func() error {
|
|
rec = h.serverPicker.PickServer()
|
|
rawConn, err := dialer.Dial(ctx, rec.Destination())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
conn = rawConn
|
|
|
|
return nil
|
|
})
|
|
if err != nil {
|
|
return newError("failed to find an available destination").Base(err).AtWarning()
|
|
}
|
|
defer conn.Close()
|
|
|
|
target := outbound.Target
|
|
newError("tunneling request to ", target, " via ", rec.Destination().NetAddr()).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
|
|
}
|
|
|
|
user := rec.PickUser()
|
|
request := &protocol.RequestHeader{
|
|
Version: encoding.Version,
|
|
User: user,
|
|
Command: command,
|
|
Address: target.Address,
|
|
Port: target.Port,
|
|
Option: protocol.RequestOptionChunkStream,
|
|
}
|
|
|
|
account := request.User.Account.(*vmess.MemoryAccount)
|
|
request.Security = account.Security
|
|
|
|
if request.Security == protocol.SecurityType_AES128_GCM || request.Security == protocol.SecurityType_NONE || request.Security == protocol.SecurityType_CHACHA20_POLY1305 {
|
|
request.Option.Set(protocol.RequestOptionChunkMasking)
|
|
}
|
|
|
|
if shouldEnablePadding(request.Security) && request.Option.Has(protocol.RequestOptionChunkMasking) {
|
|
request.Option.Set(protocol.RequestOptionGlobalPadding)
|
|
}
|
|
|
|
if request.Security == protocol.SecurityType_ZERO {
|
|
request.Security = protocol.SecurityType_NONE
|
|
request.Option.Clear(protocol.RequestOptionChunkStream)
|
|
request.Option.Clear(protocol.RequestOptionChunkMasking)
|
|
}
|
|
|
|
if account.AuthenticatedLengthExperiment {
|
|
request.Option.Set(protocol.RequestOptionAuthenticatedLength)
|
|
}
|
|
|
|
input := link.Reader
|
|
output := link.Writer
|
|
|
|
hashkdf := hmac.New(sha256.New, []byte("VMessBF"))
|
|
hashkdf.Write(account.ID.Bytes())
|
|
|
|
behaviorSeed := crc64.Checksum(hashkdf.Sum(nil), crc64.MakeTable(crc64.ISO))
|
|
|
|
var newCtx context.Context
|
|
var newCancel context.CancelFunc
|
|
if session.TimeoutOnlyFromContext(ctx) {
|
|
newCtx, newCancel = context.WithCancel(context.Background())
|
|
}
|
|
|
|
session := encoding.NewClientSession(ctx, int64(behaviorSeed))
|
|
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)
|
|
|
|
if request.Command == protocol.RequestCommandUDP && h.cone && request.Port != 53 && request.Port != 443 {
|
|
request.Command = protocol.RequestCommandMux
|
|
request.Address = net.DomainAddress("v1.mux.cool")
|
|
request.Port = net.Port(666)
|
|
}
|
|
|
|
requestDone := func() error {
|
|
defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
|
|
|
|
writer := buf.NewBufferedWriter(buf.NewWriter(conn))
|
|
if err := session.EncodeRequestHeader(request, writer); err != nil {
|
|
return newError("failed to encode request").Base(err).AtWarning()
|
|
}
|
|
|
|
bodyWriter, err := session.EncodeRequestBody(request, writer)
|
|
if err != nil {
|
|
return newError("failed to start encoding").Base(err)
|
|
}
|
|
bodyWriter2 := bodyWriter
|
|
if request.Command == protocol.RequestCommandMux && request.Port == 666 {
|
|
bodyWriter = xudp.NewPacketWriter(bodyWriter, target, xudp.GetGlobalID(ctx))
|
|
}
|
|
if err := buf.CopyOnceTimeout(input, bodyWriter, time.Millisecond*100); err != nil && err != buf.ErrNotTimeoutReader && err != buf.ErrReadTimeout {
|
|
return newError("failed to write first payload").Base(err)
|
|
}
|
|
|
|
if err := writer.SetBuffered(false); err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := buf.Copy(input, bodyWriter, buf.UpdateActivity(timer)); err != nil {
|
|
return err
|
|
}
|
|
|
|
if request.Option.Has(protocol.RequestOptionChunkStream) && !account.NoTerminationSignal {
|
|
if err := bodyWriter2.WriteMultiBuffer(buf.MultiBuffer{}); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
responseDone := func() error {
|
|
defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
|
|
|
|
reader := &buf.BufferedReader{Reader: buf.NewReader(conn)}
|
|
header, err := session.DecodeResponseHeader(reader)
|
|
if err != nil {
|
|
return newError("failed to read header").Base(err)
|
|
}
|
|
h.handleCommand(rec.Destination(), header.Command)
|
|
|
|
bodyReader, err := session.DecodeResponseBody(request, reader)
|
|
if err != nil {
|
|
return newError("failed to start encoding response").Base(err)
|
|
}
|
|
if request.Command == protocol.RequestCommandMux && request.Port == 666 {
|
|
bodyReader = xudp.NewPacketReader(&buf.BufferedReader{Reader: bodyReader})
|
|
}
|
|
|
|
return buf.Copy(bodyReader, output, buf.UpdateActivity(timer))
|
|
}
|
|
|
|
if newCtx != nil {
|
|
ctx = newCtx
|
|
}
|
|
|
|
responseDonePost := task.OnSuccess(responseDone, task.Close(output))
|
|
if err := task.Run(ctx, requestDone, responseDonePost); err != nil {
|
|
return newError("connection ends").Base(err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
var (
|
|
enablePadding = false
|
|
)
|
|
|
|
func shouldEnablePadding(s protocol.SecurityType) bool {
|
|
return enablePadding || s == protocol.SecurityType_AES128_GCM || s == protocol.SecurityType_CHACHA20_POLY1305 || s == protocol.SecurityType_AUTO
|
|
}
|
|
|
|
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"
|
|
|
|
paddingValue := platform.NewEnvFlag("xray.vmess.padding").GetValue(func() string { return defaultFlagValue })
|
|
if paddingValue != defaultFlagValue {
|
|
enablePadding = true
|
|
}
|
|
}
|