update

app/app.go

@@ -0,0 +1,2 @@
+// Package app contains the third-party app used to replace the default app in xray-core
+package app

app/mydispatcher/config.pb.go

@@ -0,0 +1,205 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.28.0
+// 	protoc        v3.19.4
+// source: app/mydispatcher/config.proto
+
+package mydispatcher
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type SessionConfig struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *SessionConfig) Reset() {
+	*x = SessionConfig{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_mydispatcher_config_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SessionConfig) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SessionConfig) ProtoMessage() {}
+
+func (x *SessionConfig) ProtoReflect() protoreflect.Message {
+	mi := &file_app_mydispatcher_config_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SessionConfig.ProtoReflect.Descriptor instead.
+func (*SessionConfig) Descriptor() ([]byte, []int) {
+	return file_app_mydispatcher_config_proto_rawDescGZIP(), []int{0}
+}
+
+type Config struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Settings *SessionConfig `protobuf:"bytes,1,opt,name=settings,proto3" json:"settings,omitempty"`
+}
+
+func (x *Config) Reset() {
+	*x = Config{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_mydispatcher_config_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Config) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Config) ProtoMessage() {}
+
+func (x *Config) ProtoReflect() protoreflect.Message {
+	mi := &file_app_mydispatcher_config_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Config.ProtoReflect.Descriptor instead.
+func (*Config) Descriptor() ([]byte, []int) {
+	return file_app_mydispatcher_config_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *Config) GetSettings() *SessionConfig {
+	if x != nil {
+		return x.Settings
+	}
+	return nil
+}
+
+var File_app_mydispatcher_config_proto protoreflect.FileDescriptor
+
+var file_app_mydispatcher_config_proto_rawDesc = []byte{
+	0x0a, 0x1d, 0x61, 0x70, 0x70, 0x2f, 0x6d, 0x79, 0x64, 0x69, 0x73, 0x70, 0x61, 0x74, 0x63, 0x68,
+	0x65, 0x72, 0x2f, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12,
+	0x16, 0x78, 0x72, 0x61, 0x79, 0x72, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x6d, 0x79, 0x64, 0x69, 0x73,
+	0x70, 0x61, 0x74, 0x63, 0x68, 0x65, 0x72, 0x22, 0x15, 0x0a, 0x0d, 0x53, 0x65, 0x73, 0x73, 0x69,
+	0x6f, 0x6e, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x4a, 0x04, 0x08, 0x01, 0x10, 0x02, 0x22, 0x4b,
+	0x0a, 0x06, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x41, 0x0a, 0x08, 0x73, 0x65, 0x74, 0x74,
+	0x69, 0x6e, 0x67, 0x73, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x25, 0x2e, 0x78, 0x72, 0x61,
+	0x79, 0x72, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x6d, 0x79, 0x64, 0x69, 0x73, 0x70, 0x61, 0x74, 0x63,
+	0x68, 0x65, 0x72, 0x2e, 0x53, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x43, 0x6f, 0x6e, 0x66, 0x69,
+	0x67, 0x52, 0x08, 0x73, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x73, 0x42, 0x67, 0x0a, 0x1a, 0x63,
+	0x6f, 0x6d, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x72, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x6d, 0x79, 0x64,
+	0x69, 0x73, 0x70, 0x61, 0x74, 0x63, 0x68, 0x65, 0x72, 0x50, 0x01, 0x5a, 0x2f, 0x67, 0x69, 0x74,
+	0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x58, 0x72, 0x61, 0x79, 0x52, 0x2d, 0x70, 0x72,
+	0x6f, 0x6a, 0x65, 0x63, 0x74, 0x2f, 0x58, 0x72, 0x61, 0x79, 0x52, 0x2f, 0x61, 0x70, 0x70, 0x2f,
+	0x6d, 0x79, 0x64, 0x69, 0x73, 0x70, 0x61, 0x74, 0x63, 0x68, 0x65, 0x72, 0xaa, 0x02, 0x15, 0x58,
+	0x72, 0x61, 0x79, 0x52, 0x2e, 0x41, 0x70, 0x70, 0x2e, 0x4d, 0x79, 0x69, 0x73, 0x70, 0x61, 0x74,
+	0x63, 0x68, 0x65, 0x72, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_app_mydispatcher_config_proto_rawDescOnce sync.Once
+	file_app_mydispatcher_config_proto_rawDescData = file_app_mydispatcher_config_proto_rawDesc
+)
+
+func file_app_mydispatcher_config_proto_rawDescGZIP() []byte {
+	file_app_mydispatcher_config_proto_rawDescOnce.Do(func() {
+		file_app_mydispatcher_config_proto_rawDescData = protoimpl.X.CompressGZIP(file_app_mydispatcher_config_proto_rawDescData)
+	})
+	return file_app_mydispatcher_config_proto_rawDescData
+}
+
+var file_app_mydispatcher_config_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
+var file_app_mydispatcher_config_proto_goTypes = []interface{}{
+	(*SessionConfig)(nil), // 0: xrayr.app.mydispatcher.SessionConfig
+	(*Config)(nil),        // 1: xrayr.app.mydispatcher.Config
+}
+var file_app_mydispatcher_config_proto_depIdxs = []int32{
+	0, // 0: xrayr.app.mydispatcher.Config.settings:type_name -> xrayr.app.mydispatcher.SessionConfig
+	1, // [1:1] is the sub-list for method output_type
+	1, // [1:1] is the sub-list for method input_type
+	1, // [1:1] is the sub-list for extension type_name
+	1, // [1:1] is the sub-list for extension extendee
+	0, // [0:1] is the sub-list for field type_name
+}
+
+func init() { file_app_mydispatcher_config_proto_init() }
+func file_app_mydispatcher_config_proto_init() {
+	if File_app_mydispatcher_config_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_app_mydispatcher_config_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SessionConfig); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_app_mydispatcher_config_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Config); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_app_mydispatcher_config_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   2,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_app_mydispatcher_config_proto_goTypes,
+		DependencyIndexes: file_app_mydispatcher_config_proto_depIdxs,
+		MessageInfos:      file_app_mydispatcher_config_proto_msgTypes,
+	}.Build()
+	File_app_mydispatcher_config_proto = out.File
+	file_app_mydispatcher_config_proto_rawDesc = nil
+	file_app_mydispatcher_config_proto_goTypes = nil
+	file_app_mydispatcher_config_proto_depIdxs = nil
+}

app/mydispatcher/config.proto

@@ -0,0 +1,15 @@
+syntax = "proto3";
+
+package xrayr.app.mydispatcher;
+option csharp_namespace = "XrayR.App.Myispatcher";
+option go_package = "github.com/Yuzuki616/V2bX/app/mydispatcher";
+option java_package = "com.xrayr.app.mydispatcher";
+option java_multiple_files = true;
+
+message SessionConfig {
+  reserved 1;
+}
+
+message Config {
+  SessionConfig settings = 1;
+}

app/mydispatcher/default.go

@@ -0,0 +1,566 @@
+package mydispatcher
+
+//go:generate go run github.com/xtls/xray-core/common/errors/errorgen
+
+import (
+	"context"
+	"fmt"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/Yuzuki616/V2bX/common/limiter"
+	"github.com/Yuzuki616/V2bX/common/rule"
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/buf"
+	"github.com/xtls/xray-core/common/log"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/protocol"
+	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/core"
+	"github.com/xtls/xray-core/features/dns"
+	"github.com/xtls/xray-core/features/outbound"
+	"github.com/xtls/xray-core/features/policy"
+	"github.com/xtls/xray-core/features/routing"
+	routing_session "github.com/xtls/xray-core/features/routing/session"
+	"github.com/xtls/xray-core/features/stats"
+	"github.com/xtls/xray-core/transport"
+	"github.com/xtls/xray-core/transport/pipe"
+)
+
+var errSniffingTimeout = newError("timeout on sniffing")
+
+type cachedReader struct {
+	sync.Mutex
+	reader *pipe.Reader
+	cache  buf.MultiBuffer
+}
+
+func (r *cachedReader) Cache(b *buf.Buffer) {
+	mb, _ := r.reader.ReadMultiBufferTimeout(time.Millisecond * 100)
+	r.Lock()
+	if !mb.IsEmpty() {
+		r.cache, _ = buf.MergeMulti(r.cache, mb)
+	}
+	b.Clear()
+	rawBytes := b.Extend(buf.Size)
+	n := r.cache.Copy(rawBytes)
+	b.Resize(0, int32(n))
+	r.Unlock()
+}
+
+func (r *cachedReader) readInternal() buf.MultiBuffer {
+	r.Lock()
+	defer r.Unlock()
+
+	if r.cache != nil && !r.cache.IsEmpty() {
+		mb := r.cache
+		r.cache = nil
+		return mb
+	}
+
+	return nil
+}
+
+func (r *cachedReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
+	mb := r.readInternal()
+	if mb != nil {
+		return mb, nil
+	}
+
+	return r.reader.ReadMultiBuffer()
+}
+
+func (r *cachedReader) ReadMultiBufferTimeout(timeout time.Duration) (buf.MultiBuffer, error) {
+	mb := r.readInternal()
+	if mb != nil {
+		return mb, nil
+	}
+
+	return r.reader.ReadMultiBufferTimeout(timeout)
+}
+
+func (r *cachedReader) Interrupt() {
+	r.Lock()
+	if r.cache != nil {
+		r.cache = buf.ReleaseMulti(r.cache)
+	}
+	r.Unlock()
+	r.reader.Interrupt()
+}
+
+// DefaultDispatcher is a default implementation of Dispatcher.
+type DefaultDispatcher struct {
+	ohm         outbound.Manager
+	router      routing.Router
+	policy      policy.Manager
+	stats       stats.Manager
+	dns         dns.Client
+	fdns        dns.FakeDNSEngine
+	Limiter     *limiter.Limiter
+	RuleManager *rule.RuleManager
+}
+
+func init() {
+	common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
+		d := new(DefaultDispatcher)
+		if err := core.RequireFeatures(ctx, func(om outbound.Manager, router routing.Router, pm policy.Manager, sm stats.Manager, dc dns.Client) error {
+			core.RequireFeatures(ctx, func(fdns dns.FakeDNSEngine) {
+				d.fdns = fdns
+			})
+			return d.Init(config.(*Config), om, router, pm, sm, dc)
+		}); err != nil {
+			return nil, err
+		}
+		return d, nil
+	}))
+}
+
+// Init initializes DefaultDispatcher.
+func (d *DefaultDispatcher) Init(config *Config, om outbound.Manager, router routing.Router, pm policy.Manager, sm stats.Manager, dns dns.Client) error {
+	d.ohm = om
+	d.router = router
+	d.policy = pm
+	d.stats = sm
+	d.Limiter = limiter.New()
+	d.RuleManager = rule.New()
+	d.dns = dns
+	return nil
+}
+
+// Type implements common.HasType.
+func (*DefaultDispatcher) Type() interface{} {
+	return routing.DispatcherType()
+}
+
+// Start implements common.Runnable.
+func (*DefaultDispatcher) Start() error {
+	return nil
+}
+
+// Close implements common.Closable.
+func (*DefaultDispatcher) Close() error { return nil }
+
+func (d *DefaultDispatcher) getLink(ctx context.Context, network net.Network, sniffing session.SniffingRequest) (*transport.Link, *transport.Link, error) {
+	downOpt := pipe.OptionsFromContext(ctx)
+	upOpt := downOpt
+
+	if network == net.Network_UDP {
+		var ip2domain *sync.Map // net.IP.String() => domain, this map is used by server side when client turn on fakedns
+		// Client will send domain address in the buffer.UDP.Address, server record all possible target IP addrs.
+		// When target replies, server will restore the domain and send back to client.
+		// Note: this map is not global but per connection context
+		upOpt = append(upOpt, pipe.OnTransmission(func(mb buf.MultiBuffer) buf.MultiBuffer {
+			for i, buffer := range mb {
+				if buffer.UDP == nil {
+					continue
+				}
+				addr := buffer.UDP.Address
+				if addr.Family().IsIP() {
+					if fkr0, ok := d.fdns.(dns.FakeDNSEngineRev0); ok && fkr0.IsIPInIPPool(addr) && sniffing.Enabled {
+						domain := fkr0.GetDomainFromFakeDNS(addr)
+						if len(domain) > 0 {
+							buffer.UDP.Address = net.DomainAddress(domain)
+							newError("[fakedns client] override with domain: ", domain, " for xUDP buffer at ", i).WriteToLog(session.ExportIDToError(ctx))
+						} else {
+							newError("[fakedns client] failed to find domain! :", addr.String(), " for xUDP buffer at ", i).AtWarning().WriteToLog(session.ExportIDToError(ctx))
+						}
+					}
+				} else {
+					if ip2domain == nil {
+						ip2domain = new(sync.Map)
+						newError("[fakedns client] create a new map").WriteToLog(session.ExportIDToError(ctx))
+					}
+					domain := addr.Domain()
+					ips, err := d.dns.LookupIP(domain, dns.IPOption{true, true, false})
+					if err == nil {
+						for _, ip := range ips {
+							ip2domain.Store(ip.String(), domain)
+						}
+						newError("[fakedns client] candidate ip: "+fmt.Sprintf("%v", ips), " for xUDP buffer at ", i).WriteToLog(session.ExportIDToError(ctx))
+					} else {
+						newError("[fakedns client] failed to look up IP for ", domain, " for xUDP buffer at ", i).Base(err).WriteToLog(session.ExportIDToError(ctx))
+					}
+				}
+			}
+			return mb
+		}))
+		downOpt = append(downOpt, pipe.OnTransmission(func(mb buf.MultiBuffer) buf.MultiBuffer {
+			for i, buffer := range mb {
+				if buffer.UDP == nil {
+					continue
+				}
+				addr := buffer.UDP.Address
+				if addr.Family().IsIP() {
+					if ip2domain == nil {
+						continue
+					}
+					if domain, found := ip2domain.Load(addr.IP().String()); found {
+						buffer.UDP.Address = net.DomainAddress(domain.(string))
+						newError("[fakedns client] restore domain: ", domain.(string), " for xUDP buffer at ", i).WriteToLog(session.ExportIDToError(ctx))
+					}
+				} else {
+					if fkr0, ok := d.fdns.(dns.FakeDNSEngineRev0); ok {
+						fakeIp := fkr0.GetFakeIPForDomain(addr.Domain())
+						buffer.UDP.Address = fakeIp[0]
+						newError("[fakedns client] restore FakeIP: ", buffer.UDP, fmt.Sprintf("%v", fakeIp), " for xUDP buffer at ", i).WriteToLog(session.ExportIDToError(ctx))
+					}
+				}
+			}
+			return mb
+		}))
+	}
+	uplinkReader, uplinkWriter := pipe.New(upOpt...)
+	downlinkReader, downlinkWriter := pipe.New(downOpt...)
+
+	inboundLink := &transport.Link{
+		Reader: downlinkReader,
+		Writer: uplinkWriter,
+	}
+
+	outboundLink := &transport.Link{
+		Reader: uplinkReader,
+		Writer: downlinkWriter,
+	}
+
+	sessionInbound := session.InboundFromContext(ctx)
+	var user *protocol.MemoryUser
+	if sessionInbound != nil {
+		user = sessionInbound.User
+	}
+
+	if user != nil && len(user.Email) > 0 {
+		// Speed Limit and Device Limit
+		bucket, ok, reject := d.Limiter.GetUserBucket(sessionInbound.Tag, user.Email, sessionInbound.Source.Address.IP().String())
+		if reject {
+			newError("Devices reach the limit: ", user.Email).AtError().WriteToLog()
+			common.Close(outboundLink.Writer)
+			common.Close(inboundLink.Writer)
+			common.Interrupt(outboundLink.Reader)
+			common.Interrupt(inboundLink.Reader)
+			return nil, nil, newError("Devices reach the limit: ", user.Email)
+		}
+		if ok {
+			inboundLink.Writer = d.Limiter.RateWriter(inboundLink.Writer, bucket)
+			outboundLink.Writer = d.Limiter.RateWriter(outboundLink.Writer, bucket)
+		}
+		p := d.policy.ForLevel(user.Level)
+		if p.Stats.UserUplink {
+			name := "user>>>" + user.Email + ">>>traffic>>>uplink"
+			if c, _ := stats.GetOrRegisterCounter(d.stats, name); c != nil {
+				inboundLink.Writer = &SizeStatWriter{
+					Counter: c,
+					Writer:  inboundLink.Writer,
+				}
+			}
+		}
+		if p.Stats.UserDownlink {
+			name := "user>>>" + user.Email + ">>>traffic>>>downlink"
+			if c, _ := stats.GetOrRegisterCounter(d.stats, name); c != nil {
+				outboundLink.Writer = &SizeStatWriter{
+					Counter: c,
+					Writer:  outboundLink.Writer,
+				}
+			}
+		}
+	}
+
+	return inboundLink, outboundLink, nil
+}
+
+func (d *DefaultDispatcher) shouldOverride(ctx context.Context, result SniffResult, request session.SniffingRequest, destination net.Destination) bool {
+	domain := result.Domain()
+	for _, d := range request.ExcludeForDomain {
+		if strings.ToLower(domain) == d {
+			return false
+		}
+	}
+	protocolString := result.Protocol()
+	if resComp, ok := result.(SnifferResultComposite); ok {
+		protocolString = resComp.ProtocolForDomainResult()
+	}
+	for _, p := range request.OverrideDestinationForProtocol {
+		if strings.HasPrefix(protocolString, p) {
+			return true
+		}
+		if fkr0, ok := d.fdns.(dns.FakeDNSEngineRev0); ok && protocolString != "bittorrent" && p == "fakedns" &&
+			destination.Address.Family().IsIP() && fkr0.IsIPInIPPool(destination.Address) {
+			newError("Using sniffer ", protocolString, " since the fake DNS missed").WriteToLog(session.ExportIDToError(ctx))
+			return true
+		}
+		if resultSubset, ok := result.(SnifferIsProtoSubsetOf); ok {
+			if resultSubset.IsProtoSubsetOf(p) {
+				return true
+			}
+		}
+	}
+
+	return false
+}
+
+// Dispatch implements routing.Dispatcher.
+func (d *DefaultDispatcher) Dispatch(ctx context.Context, destination net.Destination) (*transport.Link, error) {
+	if !destination.IsValid() {
+		panic("Dispatcher: Invalid destination.")
+	}
+	ob := &session.Outbound{
+		Target: destination,
+	}
+	ctx = session.ContextWithOutbound(ctx, ob)
+	content := session.ContentFromContext(ctx)
+	if content == nil {
+		content = new(session.Content)
+		ctx = session.ContextWithContent(ctx, content)
+	}
+
+	sniffingRequest := content.SniffingRequest
+	inbound, outbound, err := d.getLink(ctx, destination.Network, sniffingRequest)
+	if err != nil {
+		return nil, err
+	}
+	switch {
+	case !sniffingRequest.Enabled:
+		go d.routedDispatch(ctx, outbound, destination)
+	case destination.Network != net.Network_TCP:
+		// Only metadata sniff will be used for non tcp connection
+		result, err := sniffer(ctx, nil, true)
+		if err == nil {
+			content.Protocol = result.Protocol()
+			if d.shouldOverride(ctx, result, sniffingRequest, destination) {
+				domain := result.Domain()
+				newError("sniffed domain: ", domain).WriteToLog(session.ExportIDToError(ctx))
+				destination.Address = net.ParseAddress(domain)
+				if sniffingRequest.RouteOnly && result.Protocol() != "fakedns" {
+					ob.RouteTarget = destination
+				} else {
+					ob.Target = destination
+				}
+			}
+		}
+		go d.routedDispatch(ctx, outbound, destination)
+	default:
+		go func() {
+			cReader := &cachedReader{
+				reader: outbound.Reader.(*pipe.Reader),
+			}
+			outbound.Reader = cReader
+			result, err := sniffer(ctx, cReader, sniffingRequest.MetadataOnly)
+			if err == nil {
+				content.Protocol = result.Protocol()
+			}
+			if err == nil && d.shouldOverride(ctx, result, sniffingRequest, destination) {
+				domain := result.Domain()
+				newError("sniffed domain: ", domain).WriteToLog(session.ExportIDToError(ctx))
+				destination.Address = net.ParseAddress(domain)
+				if sniffingRequest.RouteOnly && result.Protocol() != "fakedns" {
+					ob.RouteTarget = destination
+				} else {
+					ob.Target = destination
+				}
+			}
+			d.routedDispatch(ctx, outbound, destination)
+		}()
+	}
+	return inbound, nil
+}
+
+// DispatchLink implements routing.Dispatcher.
+func (d *DefaultDispatcher) DispatchLink(ctx context.Context, destination net.Destination, outbound *transport.Link) error {
+	if !destination.IsValid() {
+		return newError("Dispatcher: Invalid destination.")
+	}
+	ob := &session.Outbound{
+		Target: destination,
+	}
+	ctx = session.ContextWithOutbound(ctx, ob)
+	content := session.ContentFromContext(ctx)
+	if content == nil {
+		content = new(session.Content)
+		ctx = session.ContextWithContent(ctx, content)
+	}
+	sniffingRequest := content.SniffingRequest
+	switch {
+	case !sniffingRequest.Enabled:
+		go d.routedDispatch(ctx, outbound, destination)
+	case destination.Network != net.Network_TCP:
+		// Only metadata sniff will be used for non tcp connection
+		result, err := sniffer(ctx, nil, true)
+		if err == nil {
+			content.Protocol = result.Protocol()
+			if d.shouldOverride(ctx, result, sniffingRequest, destination) {
+				domain := result.Domain()
+				newError("sniffed domain: ", domain).WriteToLog(session.ExportIDToError(ctx))
+				destination.Address = net.ParseAddress(domain)
+				if sniffingRequest.RouteOnly && result.Protocol() != "fakedns" {
+					ob.RouteTarget = destination
+				} else {
+					ob.Target = destination
+				}
+			}
+		}
+		go d.routedDispatch(ctx, outbound, destination)
+	default:
+		go func() {
+			cReader := &cachedReader{
+				reader: outbound.Reader.(*pipe.Reader),
+			}
+			outbound.Reader = cReader
+			result, err := sniffer(ctx, cReader, sniffingRequest.MetadataOnly)
+			if err == nil {
+				content.Protocol = result.Protocol()
+			}
+			if err == nil && d.shouldOverride(ctx, result, sniffingRequest, destination) {
+				domain := result.Domain()
+				newError("sniffed domain: ", domain).WriteToLog(session.ExportIDToError(ctx))
+				destination.Address = net.ParseAddress(domain)
+				if sniffingRequest.RouteOnly && result.Protocol() != "fakedns" {
+					ob.RouteTarget = destination
+				} else {
+					ob.Target = destination
+				}
+			}
+			d.routedDispatch(ctx, outbound, destination)
+		}()
+	}
+	return nil
+}
+
+func sniffer(ctx context.Context, cReader *cachedReader, metadataOnly bool) (SniffResult, error) {
+	payload := buf.New()
+	defer payload.Release()
+
+	sniffer := NewSniffer(ctx)
+
+	metaresult, metadataErr := sniffer.SniffMetadata(ctx)
+
+	if metadataOnly {
+		return metaresult, metadataErr
+	}
+
+	contentResult, contentErr := func() (SniffResult, error) {
+		totalAttempt := 0
+		for {
+			select {
+			case <-ctx.Done():
+				return nil, ctx.Err()
+			default:
+				totalAttempt++
+				if totalAttempt > 2 {
+					return nil, errSniffingTimeout
+				}
+
+				cReader.Cache(payload)
+				if !payload.IsEmpty() {
+					result, err := sniffer.Sniff(ctx, payload.Bytes())
+					if err != common.ErrNoClue {
+						return result, err
+					}
+				}
+				if payload.IsFull() {
+					return nil, errUnknownContent
+				}
+			}
+		}
+	}()
+	if contentErr != nil && metadataErr == nil {
+		return metaresult, nil
+	}
+	if contentErr == nil && metadataErr == nil {
+		return CompositeResult(metaresult, contentResult), nil
+	}
+	return contentResult, contentErr
+}
+
+func (d *DefaultDispatcher) routedDispatch(ctx context.Context, link *transport.Link, destination net.Destination) {
+	ob := session.OutboundFromContext(ctx)
+	if hosts, ok := d.dns.(dns.HostsLookup); ok && destination.Address.Family().IsDomain() {
+		proxied := hosts.LookupHosts(ob.Target.String())
+		if proxied != nil {
+			ro := ob.RouteTarget == destination
+			destination.Address = *proxied
+			if ro {
+				ob.RouteTarget = destination
+			} else {
+				ob.Target = destination
+			}
+		}
+	}
+
+	var handler outbound.Handler
+
+	// Check if domain and protocol hit the rule
+	sessionInbound := session.InboundFromContext(ctx)
+	// Whether the inbound connection contains a user
+	if sessionInbound.User != nil {
+		if d.RuleManager.Detect(sessionInbound.Tag, destination.String(), sessionInbound.User.Email) {
+			newError(fmt.Sprintf("User %s access %s reject by rule", sessionInbound.User.Email, destination.String())).AtError().WriteToLog()
+			newError("destination is reject by rule")
+			common.Close(link.Writer)
+			common.Interrupt(link.Reader)
+			return
+		}
+	}
+
+	routingLink := routing_session.AsRoutingContext(ctx)
+	inTag := routingLink.GetInboundTag()
+	isPickRoute := 0
+	if forcedOutboundTag := session.GetForcedOutboundTagFromContext(ctx); forcedOutboundTag != "" {
+		ctx = session.SetForcedOutboundTagToContext(ctx, "")
+		if h := d.ohm.GetHandler(forcedOutboundTag); h != nil {
+			isPickRoute = 1
+			newError("taking platform initialized detour [", forcedOutboundTag, "] for [", destination, "]").WriteToLog(session.ExportIDToError(ctx))
+			handler = h
+		} else {
+			newError("non existing tag for platform initialized detour: ", forcedOutboundTag).AtError().WriteToLog(session.ExportIDToError(ctx))
+			common.Close(link.Writer)
+			common.Interrupt(link.Reader)
+			return
+		}
+	} else if d.router != nil {
+		if route, err := d.router.PickRoute(routingLink); err == nil {
+			outTag := route.GetOutboundTag()
+			if h := d.ohm.GetHandler(outTag); h != nil {
+				isPickRoute = 2
+				newError("taking detour [", outTag, "] for [", destination, "]").WriteToLog(session.ExportIDToError(ctx))
+				handler = h
+			} else {
+				newError("non existing outTag: ", outTag).AtWarning().WriteToLog(session.ExportIDToError(ctx))
+			}
+		} else {
+			newError("default route for ", destination).WriteToLog(session.ExportIDToError(ctx))
+		}
+	}
+
+	if handler == nil {
+		handler = d.ohm.GetHandler(inTag) // Default outbound hander tag should be as same as the inbound tag
+	}
+
+	// If there is no outbound with tag as same as the inbound tag
+	if handler == nil {
+		handler = d.ohm.GetDefaultHandler()
+	}
+
+	if handler == nil {
+		newError("default outbound handler not exist").WriteToLog(session.ExportIDToError(ctx))
+		common.Close(link.Writer)
+		common.Interrupt(link.Reader)
+		return
+	}
+
+	if accessMessage := log.AccessMessageFromContext(ctx); accessMessage != nil {
+		if tag := handler.Tag(); tag != "" {
+			if inTag == "" {
+				accessMessage.Detour = tag
+			} else if isPickRoute == 1 {
+				accessMessage.Detour = inTag + " ==> " + tag
+			} else if isPickRoute == 2 {
+				accessMessage.Detour = inTag + " -> " + tag
+			} else {
+				accessMessage.Detour = inTag + " >> " + tag
+			}
+		}
+		log.Record(accessMessage)
+	}
+
+	handler.Dispatch(ctx, link)
+}

app/mydispatcher/dispatcher.go

@@ -0,0 +1,4 @@
+// Package dispather implement the rate limiter and the onlie device counter
+package mydispatcher
+
+//go:generate go run github.com/xtls/xray-core/common/errors/errorgen

app/mydispatcher/errors.generated.go

@@ -0,0 +1,9 @@
+package mydispatcher
+
+import "github.com/xtls/xray-core/common/errors"
+
+type errPathObjHolder struct{}
+
+func newError(values ...interface{}) *errors.Error {
+	return errors.New(values...).WithPathObj(errPathObjHolder{})
+}

app/mydispatcher/fakednssniffer.go

@@ -0,0 +1,118 @@
+package mydispatcher
+
+import (
+	"context"
+	"strings"
+
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/core"
+	"github.com/xtls/xray-core/features/dns"
+)
+
+// newFakeDNSSniffer Create a Fake DNS metadata sniffer
+func newFakeDNSSniffer(ctx context.Context) (protocolSnifferWithMetadata, error) {
+	var fakeDNSEngine dns.FakeDNSEngine
+	{
+		fakeDNSEngineFeat := core.MustFromContext(ctx).GetFeature((*dns.FakeDNSEngine)(nil))
+		if fakeDNSEngineFeat != nil {
+			fakeDNSEngine = fakeDNSEngineFeat.(dns.FakeDNSEngine)
+		}
+	}
+
+	if fakeDNSEngine == nil {
+		errNotInit := newError("FakeDNSEngine is not initialized, but such a sniffer is used").AtError()
+		return protocolSnifferWithMetadata{}, errNotInit
+	}
+	return protocolSnifferWithMetadata{protocolSniffer: func(ctx context.Context, bytes []byte) (SniffResult, error) {
+		Target := session.OutboundFromContext(ctx).Target
+		if Target.Network == net.Network_TCP || Target.Network == net.Network_UDP {
+			domainFromFakeDNS := fakeDNSEngine.GetDomainFromFakeDNS(Target.Address)
+			if domainFromFakeDNS != "" {
+				newError("fake dns got domain: ", domainFromFakeDNS, " for ip: ", Target.Address.String()).WriteToLog(session.ExportIDToError(ctx))
+				return &fakeDNSSniffResult{domainName: domainFromFakeDNS}, nil
+			}
+		}
+
+		if ipAddressInRangeValueI := ctx.Value(ipAddressInRange); ipAddressInRangeValueI != nil {
+			ipAddressInRangeValue := ipAddressInRangeValueI.(*ipAddressInRangeOpt)
+			if fkr0, ok := fakeDNSEngine.(dns.FakeDNSEngineRev0); ok {
+				inPool := fkr0.IsIPInIPPool(Target.Address)
+				ipAddressInRangeValue.addressInRange = &inPool
+			}
+		}
+
+		return nil, common.ErrNoClue
+	}, metadataSniffer: true}, nil
+}
+
+type fakeDNSSniffResult struct {
+	domainName string
+}
+
+func (fakeDNSSniffResult) Protocol() string {
+	return "fakedns"
+}
+
+func (f fakeDNSSniffResult) Domain() string {
+	return f.domainName
+}
+
+type fakeDNSExtraOpts int
+
+const ipAddressInRange fakeDNSExtraOpts = 1
+
+type ipAddressInRangeOpt struct {
+	addressInRange *bool
+}
+
+type DNSThenOthersSniffResult struct {
+	domainName           string
+	protocolOriginalName string
+}
+
+func (f DNSThenOthersSniffResult) IsProtoSubsetOf(protocolName string) bool {
+	return strings.HasPrefix(protocolName, f.protocolOriginalName)
+}
+
+func (DNSThenOthersSniffResult) Protocol() string {
+	return "fakedns+others"
+}
+
+func (f DNSThenOthersSniffResult) Domain() string {
+	return f.domainName
+}
+
+func newFakeDNSThenOthers(ctx context.Context, fakeDNSSniffer protocolSnifferWithMetadata, others []protocolSnifferWithMetadata) (
+	protocolSnifferWithMetadata, error) { // nolint: unparam
+	// ctx may be used in the future
+	_ = ctx
+	return protocolSnifferWithMetadata{
+		protocolSniffer: func(ctx context.Context, bytes []byte) (SniffResult, error) {
+			ipAddressInRangeValue := &ipAddressInRangeOpt{}
+			ctx = context.WithValue(ctx, ipAddressInRange, ipAddressInRangeValue)
+			result, err := fakeDNSSniffer.protocolSniffer(ctx, bytes)
+			if err == nil {
+				return result, nil
+			}
+			if ipAddressInRangeValue.addressInRange != nil {
+				if *ipAddressInRangeValue.addressInRange {
+					for _, v := range others {
+						if v.metadataSniffer || bytes != nil {
+							if result, err := v.protocolSniffer(ctx, bytes); err == nil {
+								return DNSThenOthersSniffResult{domainName: result.Domain(), protocolOriginalName: result.Protocol()}, nil
+							}
+						}
+					}
+					return nil, common.ErrNoClue
+				}
+				newError("ip address not in fake dns range, return as is").AtDebug().WriteToLog()
+				return nil, common.ErrNoClue
+			}
+			newError("fake dns sniffer did not set address in range option, assume false.").AtWarning().WriteToLog()
+			return nil, common.ErrNoClue
+		},
+		metadataSniffer: false,
+	}, nil
+}

app/mydispatcher/sniffer.go

@@ -0,0 +1,132 @@
+package mydispatcher
+
+import (
+	"context"
+
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/protocol/bittorrent"
+	"github.com/xtls/xray-core/common/protocol/http"
+	"github.com/xtls/xray-core/common/protocol/tls"
+)
+
+type SniffResult interface {
+	Protocol() string
+	Domain() string
+}
+
+type protocolSniffer func(context.Context, []byte) (SniffResult, error)
+
+type protocolSnifferWithMetadata struct {
+	protocolSniffer protocolSniffer
+	// A Metadata sniffer will be invoked on connection establishment only, with nil body,
+	// for both TCP and UDP connections
+	// It will not be shown as a traffic type for routing unless there is no other successful sniffing.
+	metadataSniffer bool
+}
+
+type Sniffer struct {
+	sniffer []protocolSnifferWithMetadata
+}
+
+func NewSniffer(ctx context.Context) *Sniffer {
+	ret := &Sniffer{
+		sniffer: []protocolSnifferWithMetadata{
+			{func(c context.Context, b []byte) (SniffResult, error) { return http.SniffHTTP(b) }, false},
+			{func(c context.Context, b []byte) (SniffResult, error) { return tls.SniffTLS(b) }, false},
+			{func(c context.Context, b []byte) (SniffResult, error) { return bittorrent.SniffBittorrent(b) }, false},
+		},
+	}
+	if sniffer, err := newFakeDNSSniffer(ctx); err == nil {
+		others := ret.sniffer
+		ret.sniffer = append(ret.sniffer, sniffer)
+		fakeDNSThenOthers, err := newFakeDNSThenOthers(ctx, sniffer, others)
+		if err == nil {
+			ret.sniffer = append([]protocolSnifferWithMetadata{fakeDNSThenOthers}, ret.sniffer...)
+		}
+	}
+	return ret
+}
+
+var errUnknownContent = newError("unknown content")
+
+func (s *Sniffer) Sniff(c context.Context, payload []byte) (SniffResult, error) {
+	var pendingSniffer []protocolSnifferWithMetadata
+	for _, si := range s.sniffer {
+		s := si.protocolSniffer
+		if si.metadataSniffer {
+			continue
+		}
+		result, err := s(c, payload)
+		if err == common.ErrNoClue {
+			pendingSniffer = append(pendingSniffer, si)
+			continue
+		}
+
+		if err == nil && result != nil {
+			return result, nil
+		}
+	}
+
+	if len(pendingSniffer) > 0 {
+		s.sniffer = pendingSniffer
+		return nil, common.ErrNoClue
+	}
+
+	return nil, errUnknownContent
+}
+
+func (s *Sniffer) SniffMetadata(c context.Context) (SniffResult, error) {
+	var pendingSniffer []protocolSnifferWithMetadata
+	for _, si := range s.sniffer {
+		s := si.protocolSniffer
+		if !si.metadataSniffer {
+			pendingSniffer = append(pendingSniffer, si)
+			continue
+		}
+		result, err := s(c, nil)
+		if err == common.ErrNoClue {
+			pendingSniffer = append(pendingSniffer, si)
+			continue
+		}
+
+		if err == nil && result != nil {
+			return result, nil
+		}
+	}
+
+	if len(pendingSniffer) > 0 {
+		s.sniffer = pendingSniffer
+		return nil, common.ErrNoClue
+	}
+
+	return nil, errUnknownContent
+}
+
+func CompositeResult(domainResult SniffResult, protocolResult SniffResult) SniffResult {
+	return &compositeResult{domainResult: domainResult, protocolResult: protocolResult}
+}
+
+type compositeResult struct {
+	domainResult   SniffResult
+	protocolResult SniffResult
+}
+
+func (c compositeResult) Protocol() string {
+	return c.protocolResult.Protocol()
+}
+
+func (c compositeResult) Domain() string {
+	return c.domainResult.Domain()
+}
+
+func (c compositeResult) ProtocolForDomainResult() string {
+	return c.domainResult.Protocol()
+}
+
+type SnifferResultComposite interface {
+	ProtocolForDomainResult() string
+}
+
+type SnifferIsProtoSubsetOf interface {
+	IsProtoSubsetOf(protocolName string) bool
+}

app/mydispatcher/stats.go

@@ -0,0 +1,25 @@
+package mydispatcher
+
+import (
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/buf"
+	"github.com/xtls/xray-core/features/stats"
+)
+
+type SizeStatWriter struct {
+	Counter stats.Counter
+	Writer  buf.Writer
+}
+
+func (w *SizeStatWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
+	w.Counter.Add(int64(mb.Len()))
+	return w.Writer.WriteMultiBuffer(mb)
+}
+
+func (w *SizeStatWriter) Close() error {
+	return common.Close(w.Writer)
+}
+
+func (w *SizeStatWriter) Interrupt() {
+	common.Interrupt(w.Writer)
+}

app/mydispatcher/stats_test.go

@@ -0,0 +1,44 @@
+package mydispatcher_test
+
+import (
+	"testing"
+
+	. "github.com/xtls/xray-core/app/dispatcher"
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/buf"
+)
+
+type TestCounter int64
+
+func (c *TestCounter) Value() int64 {
+	return int64(*c)
+}
+
+func (c *TestCounter) Add(v int64) int64 {
+	x := int64(*c) + v
+	*c = TestCounter(x)
+	return x
+}
+
+func (c *TestCounter) Set(v int64) int64 {
+	*c = TestCounter(v)
+	return v
+}
+
+func TestStatsWriter(t *testing.T) {
+	var c TestCounter
+	writer := &SizeStatWriter{
+		Counter: &c,
+		Writer:  buf.Discard,
+	}
+
+	mb := buf.MergeBytes(nil, []byte("abcd"))
+	common.Must(writer.WriteMultiBuffer(mb))
+
+	mb = buf.MergeBytes(nil, []byte("efg"))
+	common.Must(writer.WriteMultiBuffer(mb))
+
+	if c.Value() != 7 {
+		t.Fatal("unexpected counter value. want 7, but got ", c.Value())
+	}
+}