package inbound //go:generate go run $GOPATH/src/v2ray.com/core/common/errors/errorgen/main.go -pkg inbound -path Proxy,VMess,Inbound import ( "context" "io" "strings" "sync" "time" "v2ray.com/core" "v2ray.com/core/common" "v2ray.com/core/common/buf" "v2ray.com/core/common/errors" "v2ray.com/core/common/log" "v2ray.com/core/common/net" "v2ray.com/core/common/protocol" "v2ray.com/core/common/serial" "v2ray.com/core/common/signal" "v2ray.com/core/common/uuid" "v2ray.com/core/proxy/vmess" "v2ray.com/core/proxy/vmess/encoding" "v2ray.com/core/transport/internet" "v2ray.com/core/transport/ray" ) type userByEmail struct { sync.Mutex cache map[string]*protocol.User defaultLevel uint32 defaultAlterIDs uint16 } func newUserByEmail(config *DefaultConfig) *userByEmail { return &userByEmail{ cache: make(map[string]*protocol.User), defaultLevel: config.Level, defaultAlterIDs: uint16(config.AlterId), } } func (v *userByEmail) addNoLock(u *protocol.User) bool { email := strings.ToLower(u.Email) user, found := v.cache[email] if found { return false } v.cache[email] = user return true } func (v *userByEmail) Add(u *protocol.User) bool { v.Lock() defer v.Unlock() return v.addNoLock(u) } func (v *userByEmail) Get(email string) (*protocol.User, bool) { email = strings.ToLower(email) v.Lock() defer v.Unlock() user, found := v.cache[email] if !found { id := uuid.New() account := &vmess.Account{ Id: id.String(), AlterId: uint32(v.defaultAlterIDs), } user = &protocol.User{ Level: v.defaultLevel, Email: email, Account: serial.ToTypedMessage(account), } v.cache[email] = user } return user, found } func (v *userByEmail) Remove(email string) bool { email = strings.ToLower(email) v.Lock() defer v.Unlock() if _, found := v.cache[email]; !found { return false } delete(v.cache, email) return true } // Handler is an inbound connection handler that handles messages in VMess protocol. type Handler struct { policyManager core.PolicyManager inboundHandlerManager core.InboundHandlerManager clients protocol.UserValidator usersByEmail *userByEmail detours *DetourConfig sessionHistory *encoding.SessionHistory secure bool } // New creates a new VMess inbound handler. func New(ctx context.Context, config *Config) (*Handler, error) { v := core.MustFromContext(ctx) handler := &Handler{ policyManager: v.PolicyManager(), inboundHandlerManager: v.InboundHandlerManager(), clients: vmess.NewTimedUserValidator(protocol.DefaultIDHash), detours: config.Detour, usersByEmail: newUserByEmail(config.GetDefaultValue()), sessionHistory: encoding.NewSessionHistory(), secure: config.SecureEncryptionOnly, } for _, user := range config.User { if err := handler.AddUser(ctx, user); err != nil { return nil, newError("failed to initiate user").Base(err) } } return handler, nil } // Close implements common.Closable. func (h *Handler) Close() error { common.Close(h.clients) common.Close(h.sessionHistory) common.Close(h.usersByEmail) return nil } // Network implements proxy.Inbound.Network(). func (*Handler) Network() net.NetworkList { return net.NetworkList{ Network: []net.Network{net.Network_TCP}, } } func (h *Handler) GetUser(email string) *protocol.User { user, existing := h.usersByEmail.Get(email) if !existing { h.clients.Add(user) } return user } func (h *Handler) AddUser(ctx context.Context, user *protocol.User) error { if len(user.Email) > 0 && !h.usersByEmail.Add(user) { return newError("User ", user.Email, " already exists.") } return h.clients.Add(user) } func (h *Handler) RemoveUser(ctx context.Context, email string) error { if len(email) == 0 { return newError("Email must not be empty.") } if !h.usersByEmail.Remove(email) { return newError("User ", email, " not found.") } h.clients.Remove(email) return nil } func transferRequest(timer signal.ActivityUpdater, session *encoding.ServerSession, request *protocol.RequestHeader, input io.Reader, output ray.OutputStream) error { defer output.Close() bodyReader := session.DecodeRequestBody(request, input) if err := buf.Copy(bodyReader, output, buf.UpdateActivity(timer)); err != nil { return newError("failed to transfer request").Base(err) } return nil } func transferResponse(timer signal.ActivityUpdater, session *encoding.ServerSession, request *protocol.RequestHeader, response *protocol.ResponseHeader, input buf.Reader, output io.Writer) error { session.EncodeResponseHeader(response, output) bodyWriter := session.EncodeResponseBody(request, output) { // Optimize for small response packet data, err := input.ReadMultiBuffer() if err != nil { return err } if err := bodyWriter.WriteMultiBuffer(data); err != nil { return err } } if bufferedWriter, ok := output.(*buf.BufferedWriter); ok { if err := bufferedWriter.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.WriteMultiBuffer(buf.MultiBuffer{}); err != nil { return err } } return nil } func isInecureEncryption(s protocol.SecurityType) bool { return s == protocol.SecurityType_NONE || s == protocol.SecurityType_LEGACY || s == protocol.SecurityType_UNKNOWN } // Process implements proxy.Inbound.Process(). func (h *Handler) Process(ctx context.Context, network net.Network, connection internet.Connection, dispatcher core.Dispatcher) error { sessionPolicy := h.policyManager.ForLevel(0) if err := connection.SetReadDeadline(time.Now().Add(sessionPolicy.Timeouts.Handshake)); err != nil { return newError("unable to set read deadline").Base(err).AtWarning() } reader := buf.NewBufferedReader(buf.NewReader(connection)) session := encoding.NewServerSession(h.clients, h.sessionHistory) request, err := session.DecodeRequestHeader(reader) if err != nil { if errors.Cause(err) != io.EOF { log.Record(&log.AccessMessage{ From: connection.RemoteAddr(), To: "", Status: log.AccessRejected, Reason: err, }) err = newError("invalid request from ", connection.RemoteAddr()).Base(err).AtInfo() } return err } if h.secure && isInecureEncryption(request.Security) { log.Record(&log.AccessMessage{ From: connection.RemoteAddr(), To: "", Status: log.AccessRejected, Reason: "Insecure encryption", }) return newError("client is using insecure encryption: ", request.Security) } if request.Command != protocol.RequestCommandMux { log.Record(&log.AccessMessage{ From: connection.RemoteAddr(), To: request.Destination(), Status: log.AccessAccepted, Reason: "", }) } newError("received request for ", request.Destination()).WithContext(ctx).WriteToLog() if err := connection.SetReadDeadline(time.Time{}); err != nil { newError("unable to set back read deadline").Base(err).WithContext(ctx).WriteToLog() } sessionPolicy = h.policyManager.ForLevel(request.User.Level) ctx = protocol.ContextWithUser(ctx, request.User) ctx, cancel := context.WithCancel(ctx) timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle) ray, err := dispatcher.Dispatch(ctx, request.Destination()) if err != nil { return newError("failed to dispatch request to ", request.Destination()).Base(err) } input := ray.InboundInput() output := ray.InboundOutput() requestDone := func() error { defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly) return transferRequest(timer, session, request, reader, input) } responseDone := func() error { writer := buf.NewBufferedWriter(buf.NewWriter(connection)) defer writer.Flush() defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly) response := &protocol.ResponseHeader{ Command: h.generateCommand(ctx, request), } return transferResponse(timer, session, request, response, output, writer) } if err := signal.ExecuteParallel(ctx, requestDone, responseDone); err != nil { input.CloseError() output.CloseError() return newError("connection ends").Base(err) } return nil } func (h *Handler) generateCommand(ctx context.Context, request *protocol.RequestHeader) protocol.ResponseCommand { if h.detours != nil { tag := h.detours.To if h.inboundHandlerManager != nil { handler, err := h.inboundHandlerManager.GetHandler(ctx, tag) if err != nil { newError("failed to get detour handler: ", tag).Base(err).AtWarning().WithContext(ctx).WriteToLog() return nil } proxyHandler, port, availableMin := handler.GetRandomInboundProxy() inboundHandler, ok := proxyHandler.(*Handler) if ok && inboundHandler != nil { if availableMin > 255 { availableMin = 255 } newError("pick detour handler for port ", port, " for ", availableMin, " minutes.").AtDebug().WithContext(ctx).WriteToLog() user := inboundHandler.GetUser(request.User.Email) if user == nil { return nil } account, _ := user.GetTypedAccount() return &protocol.CommandSwitchAccount{ Port: port, ID: account.(*vmess.InternalAccount).ID.UUID(), AlterIds: uint16(len(account.(*vmess.InternalAccount).AlterIDs)), Level: user.Level, ValidMin: byte(availableMin), } } } } return nil } func init() { common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) { return New(ctx, config.(*Config)) })) }