package outbound //go:generate go run github.com/v2fly/v2ray-core/v5/common/errors/errorgen import ( "context" "time" core "github.com/v2fly/v2ray-core/v5" "github.com/v2fly/v2ray-core/v5/common" "github.com/v2fly/v2ray-core/v5/common/buf" "github.com/v2fly/v2ray-core/v5/common/net" "github.com/v2fly/v2ray-core/v5/common/protocol" "github.com/v2fly/v2ray-core/v5/common/retry" "github.com/v2fly/v2ray-core/v5/common/serial" "github.com/v2fly/v2ray-core/v5/common/session" "github.com/v2fly/v2ray-core/v5/common/signal" "github.com/v2fly/v2ray-core/v5/common/task" "github.com/v2fly/v2ray-core/v5/features/policy" "github.com/v2fly/v2ray-core/v5/proxy/vless" "github.com/v2fly/v2ray-core/v5/proxy/vless/encoding" "github.com/v2fly/v2ray-core/v5/transport" "github.com/v2fly/v2ray-core/v5/transport/internet" ) func init() { common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) { return New(ctx, config.(*Config)) })) common.Must(common.RegisterConfig((*SimplifiedConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) { simplifiedClient := config.(*SimplifiedConfig) fullClient := &Config{Vnext: []*protocol.ServerEndpoint{ { Address: simplifiedClient.Address, Port: simplifiedClient.Port, User: []*protocol.User{ { Account: serial.ToTypedMessage(&vless.Account{Id: simplifiedClient.Uuid, Encryption: "none"}), }, }, }, }} return common.CreateObject(ctx, fullClient) })) } // 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() 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, } 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) 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 err := buf.CopyOnceTimeout(clientReader, serverWriter, time.Millisecond*100); err != nil && err != buf.ErrNotTimeoutReader && err != buf.ErrReadTimeout { return err // ... } // Flush; bufferWriter.WriteMultiBuffer 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.WriteMultiBuffer if err := buf.Copy(clientReader, serverWriter, buf.UpdateActivity(timer)); err != nil { return newError("failed to transfer request payload").Base(err).AtInfo() } 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) // from serverReader.ReadMultiBuffer to clientWriter.WriteMultiBuffer if err := buf.Copy(serverReader, clientWriter, buf.UpdateActivity(timer)); 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 }