mirror of https://github.com/v2ray/v2ray-core
174 lines
4.9 KiB
Go
174 lines
4.9 KiB
Go
package outbound
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import (
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"context"
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"runtime"
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"time"
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"v2ray.com/core/app"
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"v2ray.com/core/app/log"
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"v2ray.com/core/common"
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"v2ray.com/core/common/buf"
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"v2ray.com/core/common/errors"
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"v2ray.com/core/common/net"
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"v2ray.com/core/common/protocol"
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"v2ray.com/core/common/retry"
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"v2ray.com/core/common/signal"
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"v2ray.com/core/proxy"
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"v2ray.com/core/proxy/vmess"
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"v2ray.com/core/proxy/vmess/encoding"
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"v2ray.com/core/transport/internet"
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"v2ray.com/core/transport/ray"
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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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serverList *protocol.ServerList
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serverPicker protocol.ServerPicker
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}
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func New(ctx context.Context, config *Config) (*Handler, error) {
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space := app.SpaceFromContext(ctx)
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if space == nil {
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return nil, errors.New("no space in context.").Path("Proxy", "VMess", "Outbound")
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}
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serverList := protocol.NewServerList()
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for _, rec := range config.Receiver {
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serverList.AddServer(protocol.NewServerSpecFromPB(*rec))
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}
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handler := &Handler{
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serverList: serverList,
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serverPicker: protocol.NewRoundRobinServerPicker(serverList),
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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 (v *Handler) Process(ctx context.Context, outboundRay ray.OutboundRay, dialer proxy.Dialer) error {
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var rec *protocol.ServerSpec
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var conn internet.Connection
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err := retry.ExponentialBackoff(5, 200).On(func() error {
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rec = v.serverPicker.PickServer()
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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().Path("Proxy", "VMess", "Outbound")
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}
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defer conn.Close()
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target, ok := proxy.TargetFromContext(ctx)
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if !ok {
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return errors.New("target not specified").Path("Proxy", "VMess", "Outbound").AtError()
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}
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log.Trace(errors.New("tunneling request to ", target, " via ", rec.Destination()).Path("Proxy", "VMess", "Outbound"))
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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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request := &protocol.RequestHeader{
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Version: encoding.Version,
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User: rec.PickUser(),
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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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rawAccount, err := request.User.GetTypedAccount()
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if err != nil {
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return errors.New("failed to get user account").Base(err).AtWarning().Path("Proxy", "VMess", "Outbound")
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}
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account := rawAccount.(*vmess.InternalAccount)
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request.Security = account.Security
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if request.Security.Is(protocol.SecurityType_AES128_GCM) || request.Security.Is(protocol.SecurityType_NONE) || request.Security.Is(protocol.SecurityType_CHACHA20_POLY1305) {
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request.Option.Set(protocol.RequestOptionChunkMasking)
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}
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input := outboundRay.OutboundInput()
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output := outboundRay.OutboundOutput()
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session := encoding.NewClientSession(protocol.DefaultIDHash)
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ctx, timer := signal.CancelAfterInactivity(ctx, time.Minute*2)
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requestDone := signal.ExecuteAsync(func() error {
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writer := buf.NewBufferedWriter(conn)
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session.EncodeRequestHeader(request, writer)
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bodyWriter := session.EncodeRequestBody(request, writer)
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firstPayload, err := input.ReadTimeout(time.Millisecond * 500)
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if err != nil && err != buf.ErrReadTimeout {
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return errors.New("failed to get first payload").Base(err).Path("Proxy", "VMess", "Outbound")
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}
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if !firstPayload.IsEmpty() {
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if err := bodyWriter.Write(firstPayload); err != nil {
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return errors.New("failed to write first payload").Base(err).Path("Proxy", "VMess", "Outbound")
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}
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firstPayload.Release()
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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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var inputReader buf.Reader = input
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if request.Command == protocol.RequestCommandTCP {
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inputReader = buf.NewMergingReader(input)
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}
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if err := buf.PipeUntilEOF(timer, inputReader, bodyWriter); err != nil {
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return err
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}
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if request.Option.Has(protocol.RequestOptionChunkStream) {
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if err := bodyWriter.Write(buf.NewLocal(8)); 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 := signal.ExecuteAsync(func() error {
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defer output.Close()
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reader := buf.NewBufferedReader(conn)
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header, err := session.DecodeResponseHeader(reader)
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if err != nil {
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return err
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}
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v.handleCommand(rec.Destination(), header.Command)
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reader.SetBuffered(false)
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bodyReader := session.DecodeResponseBody(request, reader)
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if err := buf.PipeUntilEOF(timer, bodyReader, output); err != nil {
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return err
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}
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return nil
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})
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if err := signal.ErrorOrFinish2(ctx, requestDone, responseDone); err != nil {
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return errors.New("connection ends").Base(err).Path("Proxy", "VMess", "Outbound")
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}
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runtime.KeepAlive(timer)
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return nil
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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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}
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