package outbound
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//go:generate go run github.com/v2fly/v2ray-core/v5/common/errors/errorgen
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import (
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"context"
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core "github.com/v2fly/v2ray-core/v5"
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"github.com/v2fly/v2ray-core/v5/common"
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"github.com/v2fly/v2ray-core/v5/common/buf"
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"github.com/v2fly/v2ray-core/v5/common/net"
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"github.com/v2fly/v2ray-core/v5/common/protocol"
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"github.com/v2fly/v2ray-core/v5/common/retry"
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"github.com/v2fly/v2ray-core/v5/common/serial"
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"github.com/v2fly/v2ray-core/v5/common/session"
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"github.com/v2fly/v2ray-core/v5/common/signal"
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"github.com/v2fly/v2ray-core/v5/common/task"
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"github.com/v2fly/v2ray-core/v5/features/policy"
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"github.com/v2fly/v2ray-core/v5/proxy"
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"github.com/v2fly/v2ray-core/v5/proxy/vless"
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"github.com/v2fly/v2ray-core/v5/proxy/vless/encoding"
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"github.com/v2fly/v2ray-core/v5/transport"
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"github.com/v2fly/v2ray-core/v5/transport/internet"
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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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common.Must(common.RegisterConfig((*SimplifiedConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
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simplifiedClient := config.(*SimplifiedConfig)
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fullClient := &Config{Vnext: []*protocol.ServerEndpoint{
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{
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Address: simplifiedClient.Address,
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Port: simplifiedClient.Port,
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User: []*protocol.User{
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{
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Account: serial.ToTypedMessage(&vless.Account{Id: simplifiedClient.Uuid, Encryption: "none"}),
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},
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},
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},
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}}
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return common.CreateObject(ctx, fullClient)
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}))
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}
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// Handler is an outbound connection handler for VLess 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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policyManager policy.Manager
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}
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// New creates a new VLess outbound handler.
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func New(ctx context.Context, config *Config) (*Handler, error) {
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serverList := protocol.NewServerList()
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for _, rec := range config.Vnext {
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s, err := protocol.NewServerSpecFromPB(rec)
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if err != nil {
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return nil, newError("failed to parse server spec").Base(err).AtError()
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}
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serverList.AddServer(s)
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}
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v := core.MustFromContext(ctx)
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handler := &Handler{
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serverList: serverList,
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serverPicker: protocol.NewRoundRobinServerPicker(serverList),
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policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
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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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var rec *protocol.ServerSpec
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var conn internet.Connection
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if err := retry.ExponentialBackoff(5, 200).On(func() error {
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rec = h.serverPicker.PickServer()
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var err error
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conn, 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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return nil
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}); err != nil {
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return newError("failed to find an available destination").Base(err).AtWarning()
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}
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defer conn.Close()
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outbound := session.OutboundFromContext(ctx)
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if outbound == nil || !outbound.Target.IsValid() {
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return newError("target not specified").AtError()
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}
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target := outbound.Target
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newError("tunneling request to ", target, " via ", rec.Destination().NetAddr()).AtInfo().WriteToLog(session.ExportIDToError(ctx))
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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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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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}
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account := request.User.Account.(*vless.MemoryAccount)
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requestAddons := &encoding.Addons{
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Flow: account.Flow,
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}
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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, cancel, sessionPolicy.Timeouts.ConnectionIdle)
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clientReader := link.Reader // .(*pipe.Reader)
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clientWriter := link.Writer // .(*pipe.Writer)
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postRequest := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
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bufferWriter := buf.NewBufferedWriter(buf.NewWriter(conn))
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if err := encoding.EncodeRequestHeader(bufferWriter, request, requestAddons); err != nil {
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return newError("failed to encode request header").Base(err).AtWarning()
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}
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// default: serverWriter := bufferWriter
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serverWriter := encoding.EncodeBodyAddons(bufferWriter, request, requestAddons)
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if err := buf.CopyOnceTimeout(clientReader, serverWriter, proxy.FirstPayloadTimeout); err != nil && err != buf.ErrNotTimeoutReader && err != buf.ErrReadTimeout {
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return err // ...
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}
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// Flush; bufferWriter.WriteMultiBuffer now is bufferWriter.writer.WriteMultiBuffer
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if err := bufferWriter.SetBuffered(false); err != nil {
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return newError("failed to write A request payload").Base(err).AtWarning()
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}
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// from clientReader.ReadMultiBuffer to serverWriter.WriteMultiBuffer
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if err := buf.Copy(clientReader, serverWriter, buf.UpdateActivity(timer)); err != nil {
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return newError("failed to transfer request payload").Base(err).AtInfo()
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}
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return nil
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}
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getResponse := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
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responseAddons, err := encoding.DecodeResponseHeader(conn, request)
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if err != nil {
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return newError("failed to decode response header").Base(err).AtInfo()
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}
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// default: serverReader := buf.NewReader(conn)
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serverReader := encoding.DecodeBodyAddons(conn, request, responseAddons)
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// from serverReader.ReadMultiBuffer to clientWriter.WriteMultiBuffer
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if err := buf.Copy(serverReader, clientWriter, buf.UpdateActivity(timer)); err != nil {
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return newError("failed to transfer response payload").Base(err).AtInfo()
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}
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return nil
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}
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if err := task.Run(ctx, postRequest, task.OnSuccess(getResponse, task.Close(clientWriter))); err != nil {
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return newError("connection ends").Base(err).AtInfo()
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}
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return nil
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}
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