package outbound //go:generate go run $GOPATH/src/v2ray.com/core/tools/generrorgen/main.go -pkg outbound -path Proxy,VMess,Outbound import ( "context" "runtime" "time" "v2ray.com/core/app" "v2ray.com/core/app/log" "v2ray.com/core/common" "v2ray.com/core/common/buf" "v2ray.com/core/common/net" "v2ray.com/core/common/protocol" "v2ray.com/core/common/retry" "v2ray.com/core/common/signal" "v2ray.com/core/proxy" "v2ray.com/core/proxy/vmess" "v2ray.com/core/proxy/vmess/encoding" "v2ray.com/core/transport/internet" "v2ray.com/core/transport/ray" ) // Handler is an outbound connection handler for VMess protocol. type Handler struct { serverList *protocol.ServerList serverPicker protocol.ServerPicker } func New(ctx context.Context, config *Config) (*Handler, error) { space := app.SpaceFromContext(ctx) if space == nil { return nil, newError("no space in context.") } serverList := protocol.NewServerList() for _, rec := range config.Receiver { serverList.AddServer(protocol.NewServerSpecFromPB(*rec)) } handler := &Handler{ serverList: serverList, serverPicker: protocol.NewRoundRobinServerPicker(serverList), } return handler, nil } // Process implements proxy.Outbound.Process(). func (v *Handler) Process(ctx context.Context, outboundRay ray.OutboundRay, dialer proxy.Dialer) error { var rec *protocol.ServerSpec var conn internet.Connection err := retry.ExponentialBackoff(5, 200).On(func() error { rec = v.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, ok := proxy.TargetFromContext(ctx) if !ok { return newError("target not specified").AtError() } log.Trace(newError("tunneling request to ", target, " via ", rec.Destination())) command := protocol.RequestCommandTCP if target.Network == net.Network_UDP { command = protocol.RequestCommandUDP } request := &protocol.RequestHeader{ Version: encoding.Version, User: rec.PickUser(), Command: command, Address: target.Address, Port: target.Port, Option: protocol.RequestOptionChunkStream, } rawAccount, err := request.User.GetTypedAccount() if err != nil { return newError("failed to get user account").Base(err).AtWarning() } account := rawAccount.(*vmess.InternalAccount) request.Security = account.Security if request.Security.Is(protocol.SecurityType_AES128_GCM) || request.Security.Is(protocol.SecurityType_NONE) || request.Security.Is(protocol.SecurityType_CHACHA20_POLY1305) { request.Option.Set(protocol.RequestOptionChunkMasking) } input := outboundRay.OutboundInput() output := outboundRay.OutboundOutput() session := encoding.NewClientSession(protocol.DefaultIDHash) ctx, timer := signal.CancelAfterInactivity(ctx, time.Minute*2) requestDone := signal.ExecuteAsync(func() error { writer := buf.NewBufferedWriter(conn) session.EncodeRequestHeader(request, writer) bodyWriter := session.EncodeRequestBody(request, writer) firstPayload, err := input.ReadTimeout(time.Millisecond * 500) if err != nil && err != buf.ErrReadTimeout { return newError("failed to get first payload").Base(err) } if !firstPayload.IsEmpty() { if err := bodyWriter.Write(firstPayload); err != nil { return newError("failed to write first payload").Base(err) } firstPayload.Release() } 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) { if err := bodyWriter.Write(buf.NewMultiBuffer()); err != nil { return err } } return nil }) responseDone := signal.ExecuteAsync(func() error { defer output.Close() reader := buf.NewBufferedReader(conn) header, err := session.DecodeResponseHeader(reader) if err != nil { return err } v.handleCommand(rec.Destination(), header.Command) reader.SetBuffered(false) bodyReader := session.DecodeResponseBody(request, reader) if err := buf.Copy(bodyReader, output, buf.UpdateActivity(timer)); err != nil { return err } return nil }) if err := signal.ErrorOrFinish2(ctx, requestDone, responseDone); err != nil { return newError("connection ends").Base(err) } runtime.KeepAlive(timer) return nil } func init() { common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) { return New(ctx, config.(*Config)) })) }