package inbound
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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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"io"
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"strings"
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"sync"
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"time"
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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/errors"
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"github.com/v2fly/v2ray-core/v5/common/log"
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"github.com/v2fly/v2ray-core/v5/common/net"
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"github.com/v2fly/v2ray-core/v5/common/platform"
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"github.com/v2fly/v2ray-core/v5/common/protocol"
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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/common/uuid"
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feature_inbound "github.com/v2fly/v2ray-core/v5/features/inbound"
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"github.com/v2fly/v2ray-core/v5/features/policy"
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"github.com/v2fly/v2ray-core/v5/features/routing"
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"github.com/v2fly/v2ray-core/v5/proxy/vmess"
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"github.com/v2fly/v2ray-core/v5/proxy/vmess/encoding"
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"github.com/v2fly/v2ray-core/v5/transport/internet"
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)
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type userByEmail struct {
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sync.Mutex
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cache map[string]*protocol.MemoryUser
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defaultLevel uint32
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defaultAlterIDs uint16
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}
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func newUserByEmail(config *DefaultConfig) *userByEmail {
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return &userByEmail{
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cache: make(map[string]*protocol.MemoryUser),
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defaultLevel: config.Level,
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defaultAlterIDs: uint16(config.AlterId),
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}
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}
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func (v *userByEmail) addNoLock(u *protocol.MemoryUser) bool {
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email := strings.ToLower(u.Email)
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_, found := v.cache[email]
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if found {
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return false
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}
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v.cache[email] = u
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return true
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}
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func (v *userByEmail) Add(u *protocol.MemoryUser) bool {
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v.Lock()
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defer v.Unlock()
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return v.addNoLock(u)
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}
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func (v *userByEmail) Get(email string) (*protocol.MemoryUser, bool) {
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email = strings.ToLower(email)
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v.Lock()
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defer v.Unlock()
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user, found := v.cache[email]
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if !found {
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id := uuid.New()
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rawAccount := &vmess.Account{
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Id: id.String(),
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AlterId: uint32(v.defaultAlterIDs),
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}
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account, err := rawAccount.AsAccount()
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common.Must(err)
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user = &protocol.MemoryUser{
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Level: v.defaultLevel,
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Email: email,
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Account: account,
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}
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v.cache[email] = user
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}
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return user, found
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}
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func (v *userByEmail) Remove(email string) bool {
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email = strings.ToLower(email)
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v.Lock()
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defer v.Unlock()
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if _, found := v.cache[email]; !found {
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return false
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}
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delete(v.cache, email)
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return true
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}
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// Handler is an inbound connection handler that handles messages in VMess protocol.
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type Handler struct {
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policyManager policy.Manager
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inboundHandlerManager feature_inbound.Manager
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clients *vmess.TimedUserValidator
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usersByEmail *userByEmail
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detours *DetourConfig
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sessionHistory *encoding.SessionHistory
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secure bool
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}
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// New creates a new VMess inbound handler.
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func New(ctx context.Context, config *Config) (*Handler, error) {
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v := core.MustFromContext(ctx)
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handler := &Handler{
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policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
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inboundHandlerManager: v.GetFeature(feature_inbound.ManagerType()).(feature_inbound.Manager),
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clients: vmess.NewTimedUserValidator(protocol.DefaultIDHash),
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detours: config.Detour,
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usersByEmail: newUserByEmail(config.GetDefaultValue()),
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sessionHistory: encoding.NewSessionHistory(),
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secure: config.SecureEncryptionOnly,
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}
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for _, user := range config.User {
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mUser, err := user.ToMemoryUser()
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if err != nil {
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return nil, newError("failed to get VMess user").Base(err)
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}
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if err := handler.AddUser(ctx, mUser); err != nil {
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return nil, newError("failed to initiate user").Base(err)
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}
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}
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return handler, nil
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}
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// Close implements common.Closable.
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func (h *Handler) Close() error {
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return errors.Combine(
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h.clients.Close(),
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h.sessionHistory.Close(),
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common.Close(h.usersByEmail))
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}
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// Network implements proxy.Inbound.Network().
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func (*Handler) Network() []net.Network {
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return []net.Network{net.Network_TCP, net.Network_UNIX}
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}
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func (h *Handler) GetUser(email string) *protocol.MemoryUser {
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user, existing := h.usersByEmail.Get(email)
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if !existing {
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h.clients.Add(user)
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}
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return user
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}
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func (h *Handler) AddUser(ctx context.Context, user *protocol.MemoryUser) error {
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if len(user.Email) > 0 && !h.usersByEmail.Add(user) {
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return newError("User ", user.Email, " already exists.")
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}
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return h.clients.Add(user)
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}
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func (h *Handler) RemoveUser(ctx context.Context, email string) error {
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if email == "" {
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return newError("Email must not be empty.")
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}
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if !h.usersByEmail.Remove(email) {
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return newError("User ", email, " not found.")
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}
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h.clients.Remove(email)
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return nil
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}
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func transferResponse(timer signal.ActivityUpdater, session *encoding.ServerSession, request *protocol.RequestHeader, response *protocol.ResponseHeader, input buf.Reader, output *buf.BufferedWriter) error {
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session.EncodeResponseHeader(response, output)
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bodyWriter, err := session.EncodeResponseBody(request, output)
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if err != nil {
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return newError("failed to start decoding response").Base(err)
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}
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{
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// Optimize for small response packet
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data, err := input.ReadMultiBuffer()
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if err != nil {
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return err
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}
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if err := bodyWriter.WriteMultiBuffer(data); err != nil {
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return err
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}
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}
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if err := output.SetBuffered(false); err != nil {
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return err
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}
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if err := buf.Copy(input, bodyWriter, buf.UpdateActivity(timer)); err != nil {
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return err
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}
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account := request.User.Account.(*vmess.MemoryAccount)
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if request.Option.Has(protocol.RequestOptionChunkStream) && !account.NoTerminationSignal {
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if err := bodyWriter.WriteMultiBuffer(buf.MultiBuffer{}); 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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func isInsecureEncryption(s protocol.SecurityType) bool {
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return s == protocol.SecurityType_NONE || s == protocol.SecurityType_LEGACY || s == protocol.SecurityType_UNKNOWN
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}
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// Process implements proxy.Inbound.Process().
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func (h *Handler) Process(ctx context.Context, network net.Network, connection internet.Connection, dispatcher routing.Dispatcher) error {
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sessionPolicy := h.policyManager.ForLevel(0)
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if err := connection.SetReadDeadline(time.Now().Add(sessionPolicy.Timeouts.Handshake)); err != nil {
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return newError("unable to set read deadline").Base(err).AtWarning()
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}
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reader := &buf.BufferedReader{Reader: buf.NewReader(connection)}
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svrSession := encoding.NewServerSession(h.clients, h.sessionHistory)
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svrSession.SetAEADForced(aeadForced)
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request, err := svrSession.DecodeRequestHeader(reader)
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if err != nil {
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if errors.Cause(err) != io.EOF {
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log.Record(&log.AccessMessage{
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From: connection.RemoteAddr(),
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To: "",
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Status: log.AccessRejected,
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Reason: err,
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})
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err = newError("invalid request from ", connection.RemoteAddr()).Base(err).AtInfo()
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}
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return err
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}
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if h.secure && isInsecureEncryption(request.Security) {
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log.Record(&log.AccessMessage{
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From: connection.RemoteAddr(),
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To: "",
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Status: log.AccessRejected,
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Reason: "Insecure encryption",
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Email: request.User.Email,
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})
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return newError("client is using insecure encryption: ", request.Security)
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}
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if request.Command != protocol.RequestCommandMux {
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ctx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{
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From: connection.RemoteAddr(),
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To: request.Destination(),
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Status: log.AccessAccepted,
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Reason: "",
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Email: request.User.Email,
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})
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}
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newError("received request for ", request.Destination()).WriteToLog(session.ExportIDToError(ctx))
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if err := connection.SetReadDeadline(time.Time{}); err != nil {
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newError("unable to set back read deadline").Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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inbound := session.InboundFromContext(ctx)
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if inbound == nil {
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panic("no inbound metadata")
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}
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inbound.User = request.User
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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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ctx = policy.ContextWithBufferPolicy(ctx, sessionPolicy.Buffer)
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link, err := dispatcher.Dispatch(ctx, request.Destination())
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if err != nil {
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return newError("failed to dispatch request to ", request.Destination()).Base(err)
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}
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requestDone := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
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bodyReader, err := svrSession.DecodeRequestBody(request, reader)
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if err != nil {
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return newError("failed to start decoding").Base(err)
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}
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if err := buf.Copy(bodyReader, link.Writer, buf.UpdateActivity(timer)); err != nil {
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return newError("failed to transfer request").Base(err)
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}
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return nil
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}
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responseDone := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
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writer := buf.NewBufferedWriter(buf.NewWriter(connection))
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defer writer.Flush()
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response := &protocol.ResponseHeader{
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Command: h.generateCommand(ctx, request),
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}
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return transferResponse(timer, svrSession, request, response, link.Reader, writer)
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}
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requestDonePost := task.OnSuccess(requestDone, task.Close(link.Writer))
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if err := task.Run(ctx, requestDonePost, responseDone); err != nil {
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common.Interrupt(link.Reader)
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common.Interrupt(link.Writer)
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return newError("connection ends").Base(err)
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}
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return nil
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}
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func (h *Handler) generateCommand(ctx context.Context, request *protocol.RequestHeader) protocol.ResponseCommand {
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if h.detours != nil {
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tag := h.detours.To
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if h.inboundHandlerManager != nil {
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handler, err := h.inboundHandlerManager.GetHandler(ctx, tag)
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if err != nil {
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newError("failed to get detour handler: ", tag).Base(err).AtWarning().WriteToLog(session.ExportIDToError(ctx))
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return nil
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}
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proxyHandler, port, availableMin := handler.GetRandomInboundProxy()
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inboundHandler, ok := proxyHandler.(*Handler)
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if ok && inboundHandler != nil {
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if availableMin > 255 {
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availableMin = 255
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}
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newError("pick detour handler for port ", port, " for ", availableMin, " minutes.").AtDebug().WriteToLog(session.ExportIDToError(ctx))
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user := inboundHandler.GetUser(request.User.Email)
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if user == nil {
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return nil
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}
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account := user.Account.(*vmess.MemoryAccount)
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return &protocol.CommandSwitchAccount{
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Port: port,
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ID: account.ID.UUID(),
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AlterIds: uint16(len(account.AlterIDs)),
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Level: user.Level,
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ValidMin: byte(availableMin),
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}
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}
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}
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}
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return nil
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}
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var (
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aeadForced = false
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aeadForced2022 = false
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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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simplifiedServer := config.(*SimplifiedConfig)
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fullConfig := &Config{
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User: func() (users []*protocol.User) {
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for _, v := range simplifiedServer.Users {
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account := &vmess.Account{Id: v}
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users = append(users, &protocol.User{
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Account: serial.ToTypedMessage(account),
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})
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}
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return
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}(),
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}
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return common.CreateObject(ctx, fullConfig)
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}))
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defaultFlagValue := "true_by_default_2022"
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isAeadForced := platform.NewEnvFlag("v2ray.vmess.aead.forced").GetValue(func() string { return defaultFlagValue })
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if isAeadForced == "true" {
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aeadForced = true
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}
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if isAeadForced == "true_by_default_2022" {
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aeadForced = true
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aeadForced2022 = true
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}
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}
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