mirror of https://github.com/XTLS/Xray-core
247 lines
7.3 KiB
Go
247 lines
7.3 KiB
Go
package outbound
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import (
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"context"
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"crypto/hmac"
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"crypto/sha256"
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"hash/crc64"
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"time"
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"github.com/xtls/xray-core/common"
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"github.com/xtls/xray-core/common/buf"
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"github.com/xtls/xray-core/common/errors"
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"github.com/xtls/xray-core/common/net"
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"github.com/xtls/xray-core/common/platform"
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"github.com/xtls/xray-core/common/protocol"
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"github.com/xtls/xray-core/common/retry"
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"github.com/xtls/xray-core/common/session"
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"github.com/xtls/xray-core/common/signal"
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"github.com/xtls/xray-core/common/task"
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"github.com/xtls/xray-core/common/xudp"
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core "github.com/xtls/xray-core/core"
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"github.com/xtls/xray-core/features/policy"
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"github.com/xtls/xray-core/proxy/vmess"
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"github.com/xtls/xray-core/proxy/vmess/encoding"
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"github.com/xtls/xray-core/transport"
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"github.com/xtls/xray-core/transport/internet"
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"github.com/xtls/xray-core/transport/internet/stat"
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)
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// Handler is an outbound connection handler for VMess protocol.
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type Handler struct {
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server *protocol.ServerSpec
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policyManager policy.Manager
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cone bool
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}
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// New creates a new VMess outbound handler.
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func New(ctx context.Context, config *Config) (*Handler, error) {
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if config.Receiver == nil {
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return nil, errors.New(`no vnext found`)
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}
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server, err := protocol.NewServerSpecFromPB(config.Receiver)
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if err != nil {
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return nil, errors.New("failed to get server spec").Base(err)
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}
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v := core.MustFromContext(ctx)
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handler := &Handler{
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server: server,
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policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
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cone: ctx.Value("cone").(bool),
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}
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return handler, nil
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}
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// Process implements proxy.Outbound.Process().
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func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer internet.Dialer) error {
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outbounds := session.OutboundsFromContext(ctx)
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ob := outbounds[len(outbounds)-1]
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if !ob.Target.IsValid() {
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return errors.New("target not specified").AtError()
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}
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ob.Name = "vmess"
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ob.CanSpliceCopy = 3
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rec := h.server
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var conn stat.Connection
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err := retry.ExponentialBackoff(5, 200).On(func() error {
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rawConn, err := dialer.Dial(ctx, rec.Destination)
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if err != nil {
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return err
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}
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conn = rawConn
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return nil
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})
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if err != nil {
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return errors.New("failed to find an available destination").Base(err).AtWarning()
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}
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defer conn.Close()
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target := ob.Target
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errors.LogInfo(ctx, "tunneling request to ", target, " via ", rec.Destination.NetAddr())
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command := protocol.RequestCommandTCP
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if target.Network == net.Network_UDP {
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command = protocol.RequestCommandUDP
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}
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if target.Address.Family().IsDomain() && target.Address.Domain() == "v1.mux.cool" {
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command = protocol.RequestCommandMux
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}
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user := rec.User
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request := &protocol.RequestHeader{
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Version: encoding.Version,
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User: user,
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Command: command,
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Address: target.Address,
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Port: target.Port,
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Option: protocol.RequestOptionChunkStream,
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}
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account := request.User.Account.(*vmess.MemoryAccount)
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request.Security = account.Security
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if request.Security == protocol.SecurityType_AES128_GCM || request.Security == protocol.SecurityType_NONE || request.Security == protocol.SecurityType_CHACHA20_POLY1305 {
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request.Option.Set(protocol.RequestOptionChunkMasking)
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}
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if shouldEnablePadding(request.Security) && request.Option.Has(protocol.RequestOptionChunkMasking) {
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request.Option.Set(protocol.RequestOptionGlobalPadding)
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}
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if request.Security == protocol.SecurityType_ZERO {
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request.Security = protocol.SecurityType_NONE
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request.Option.Clear(protocol.RequestOptionChunkStream)
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request.Option.Clear(protocol.RequestOptionChunkMasking)
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}
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if account.AuthenticatedLengthExperiment {
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request.Option.Set(protocol.RequestOptionAuthenticatedLength)
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}
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input := link.Reader
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output := link.Writer
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hashkdf := hmac.New(sha256.New, []byte("VMessBF"))
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hashkdf.Write(account.ID.Bytes())
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behaviorSeed := crc64.Checksum(hashkdf.Sum(nil), crc64.MakeTable(crc64.ISO))
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var newCtx context.Context
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var newCancel context.CancelFunc
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if session.TimeoutOnlyFromContext(ctx) {
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newCtx, newCancel = context.WithCancel(context.Background())
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}
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session := encoding.NewClientSession(ctx, int64(behaviorSeed))
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sessionPolicy := h.policyManager.ForLevel(request.User.Level)
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ctx, cancel := context.WithCancel(ctx)
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timer := signal.CancelAfterInactivity(ctx, func() {
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cancel()
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if newCancel != nil {
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newCancel()
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}
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}, sessionPolicy.Timeouts.ConnectionIdle)
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if request.Command == protocol.RequestCommandUDP && h.cone && request.Port != 53 && request.Port != 443 {
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request.Command = protocol.RequestCommandMux
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request.Address = net.DomainAddress("v1.mux.cool")
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request.Port = net.Port(666)
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}
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requestDone := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
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writer := buf.NewBufferedWriter(buf.NewWriter(conn))
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if err := session.EncodeRequestHeader(request, writer); err != nil {
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return errors.New("failed to encode request").Base(err).AtWarning()
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}
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bodyWriter, err := session.EncodeRequestBody(request, writer)
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if err != nil {
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return errors.New("failed to start encoding").Base(err)
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}
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bodyWriter2 := bodyWriter
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if request.Command == protocol.RequestCommandMux && request.Port == 666 {
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bodyWriter = xudp.NewPacketWriter(bodyWriter, target, xudp.GetGlobalID(ctx))
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}
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if err := buf.CopyOnceTimeout(input, bodyWriter, time.Millisecond*100); err != nil && err != buf.ErrNotTimeoutReader && err != buf.ErrReadTimeout {
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return errors.New("failed to write first payload").Base(err)
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}
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if err := writer.SetBuffered(false); err != nil {
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return err
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}
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if err := buf.Copy(input, bodyWriter, buf.UpdateActivity(timer)); err != nil {
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return err
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}
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if request.Option.Has(protocol.RequestOptionChunkStream) && !account.NoTerminationSignal {
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if err := bodyWriter2.WriteMultiBuffer(buf.MultiBuffer{}); err != nil {
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return err
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}
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}
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return nil
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}
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responseDone := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
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reader := &buf.BufferedReader{Reader: buf.NewReader(conn)}
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header, err := session.DecodeResponseHeader(reader)
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if err != nil {
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return errors.New("failed to read header").Base(err)
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}
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h.handleCommand(rec.Destination, header.Command)
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bodyReader, err := session.DecodeResponseBody(request, reader)
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if err != nil {
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return errors.New("failed to start encoding response").Base(err)
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}
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if request.Command == protocol.RequestCommandMux && request.Port == 666 {
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bodyReader = xudp.NewPacketReader(&buf.BufferedReader{Reader: bodyReader})
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}
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return buf.Copy(bodyReader, output, buf.UpdateActivity(timer))
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}
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if newCtx != nil {
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ctx = newCtx
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}
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responseDonePost := task.OnSuccess(responseDone, task.Close(output))
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if err := task.Run(ctx, requestDone, responseDonePost); err != nil {
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return errors.New("connection ends").Base(err)
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}
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return nil
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}
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var (
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enablePadding = false
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)
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func shouldEnablePadding(s protocol.SecurityType) bool {
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return enablePadding || s == protocol.SecurityType_AES128_GCM || s == protocol.SecurityType_CHACHA20_POLY1305 || s == protocol.SecurityType_AUTO
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}
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func init() {
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common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
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return New(ctx, config.(*Config))
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}))
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const defaultFlagValue = "NOT_DEFINED_AT_ALL"
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paddingValue := platform.NewEnvFlag(platform.UseVmessPadding).GetValue(func() string { return defaultFlagValue })
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if paddingValue != defaultFlagValue {
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enablePadding = true
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}
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}
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