Add seed padding logic

- Seed is decoupled with XTLS Vision, which means Seed can turn on without flow
- XTLS Vision now use Seed config to configure its padding only mode

proxy/addons.pb.go

@@ -0,0 +1,512 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.33.0
+// 	protoc        v4.23.1
+// source: proxy/addons.proto
+
+package proxy
+
+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 SeedMode int32
+
+const (
+	SeedMode_Unknown              SeedMode = 0
+	SeedMode_PaddingOnly          SeedMode = 1
+	SeedMode_PaddingPlusDelay     SeedMode = 2
+	SeedMode_IndependentScheduler SeedMode = 3
+)
+
+// Enum value maps for SeedMode.
+var (
+	SeedMode_name = map[int32]string{
+		0: "Unknown",
+		1: "PaddingOnly",
+		2: "PaddingPlusDelay",
+		3: "IndependentScheduler",
+	}
+	SeedMode_value = map[string]int32{
+		"Unknown":              0,
+		"PaddingOnly":          1,
+		"PaddingPlusDelay":     2,
+		"IndependentScheduler": 3,
+	}
+)
+
+func (x SeedMode) Enum() *SeedMode {
+	p := new(SeedMode)
+	*p = x
+	return p
+}
+
+func (x SeedMode) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (SeedMode) Descriptor() protoreflect.EnumDescriptor {
+	return file_proxy_addons_proto_enumTypes[0].Descriptor()
+}
+
+func (SeedMode) Type() protoreflect.EnumType {
+	return &file_proxy_addons_proto_enumTypes[0]
+}
+
+func (x SeedMode) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use SeedMode.Descriptor instead.
+func (SeedMode) EnumDescriptor() ([]byte, []int) {
+	return file_proxy_addons_proto_rawDescGZIP(), []int{0}
+}
+
+type Addons struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Flow      string           `protobuf:"bytes,1,opt,name=Flow,proto3" json:"Flow,omitempty"`
+	Seed      []byte           `protobuf:"bytes,2,opt,name=Seed,proto3" json:"Seed,omitempty"`
+	Mode      SeedMode         `protobuf:"varint,3,opt,name=Mode,proto3,enum=xray.proxy.SeedMode" json:"Mode,omitempty"`
+	Duration  string           `protobuf:"bytes,4,opt,name=Duration,proto3" json:"Duration,omitempty"` // "0-8" means apply to number of packets, "1000b-" means start applying once both side exchange 1kb data, counting two-ways
+	Padding   *PaddingConfig   `protobuf:"bytes,5,opt,name=Padding,proto3" json:"Padding,omitempty"`
+	Delay     *DelayConfig     `protobuf:"bytes,6,opt,name=Delay,proto3" json:"Delay,omitempty"`
+	Scheduler *SchedulerConfig `protobuf:"bytes,7,opt,name=Scheduler,proto3" json:"Scheduler,omitempty"`
+}
+
+func (x *Addons) Reset() {
+	*x = Addons{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proxy_addons_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Addons) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Addons) ProtoMessage() {}
+
+func (x *Addons) ProtoReflect() protoreflect.Message {
+	mi := &file_proxy_addons_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 Addons.ProtoReflect.Descriptor instead.
+func (*Addons) Descriptor() ([]byte, []int) {
+	return file_proxy_addons_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Addons) GetFlow() string {
+	if x != nil {
+		return x.Flow
+	}
+	return ""
+}
+
+func (x *Addons) GetSeed() []byte {
+	if x != nil {
+		return x.Seed
+	}
+	return nil
+}
+
+func (x *Addons) GetMode() SeedMode {
+	if x != nil {
+		return x.Mode
+	}
+	return SeedMode_Unknown
+}
+
+func (x *Addons) GetDuration() string {
+	if x != nil {
+		return x.Duration
+	}
+	return ""
+}
+
+func (x *Addons) GetPadding() *PaddingConfig {
+	if x != nil {
+		return x.Padding
+	}
+	return nil
+}
+
+func (x *Addons) GetDelay() *DelayConfig {
+	if x != nil {
+		return x.Delay
+	}
+	return nil
+}
+
+func (x *Addons) GetScheduler() *SchedulerConfig {
+	if x != nil {
+		return x.Scheduler
+	}
+	return nil
+}
+
+type PaddingConfig struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	RegularMin uint32 `protobuf:"varint,1,opt,name=RegularMin,proto3" json:"RegularMin,omitempty"`
+	RegularMax uint32 `protobuf:"varint,2,opt,name=RegularMax,proto3" json:"RegularMax,omitempty"`
+	LongMin    uint32 `protobuf:"varint,3,opt,name=LongMin,proto3" json:"LongMin,omitempty"`
+	LongMax    uint32 `protobuf:"varint,4,opt,name=LongMax,proto3" json:"LongMax,omitempty"`
+}
+
+func (x *PaddingConfig) Reset() {
+	*x = PaddingConfig{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proxy_addons_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PaddingConfig) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PaddingConfig) ProtoMessage() {}
+
+func (x *PaddingConfig) ProtoReflect() protoreflect.Message {
+	mi := &file_proxy_addons_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 PaddingConfig.ProtoReflect.Descriptor instead.
+func (*PaddingConfig) Descriptor() ([]byte, []int) {
+	return file_proxy_addons_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *PaddingConfig) GetRegularMin() uint32 {
+	if x != nil {
+		return x.RegularMin
+	}
+	return 0
+}
+
+func (x *PaddingConfig) GetRegularMax() uint32 {
+	if x != nil {
+		return x.RegularMax
+	}
+	return 0
+}
+
+func (x *PaddingConfig) GetLongMin() uint32 {
+	if x != nil {
+		return x.LongMin
+	}
+	return 0
+}
+
+func (x *PaddingConfig) GetLongMax() uint32 {
+	if x != nil {
+		return x.LongMax
+	}
+	return 0
+}
+
+type DelayConfig struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	IsRandom  bool   `protobuf:"varint,1,opt,name=IsRandom,proto3" json:"IsRandom,omitempty"`
+	MinMillis uint32 `protobuf:"varint,2,opt,name=MinMillis,proto3" json:"MinMillis,omitempty"`
+	MaxMillis uint32 `protobuf:"varint,3,opt,name=MaxMillis,proto3" json:"MaxMillis,omitempty"`
+}
+
+func (x *DelayConfig) Reset() {
+	*x = DelayConfig{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proxy_addons_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *DelayConfig) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*DelayConfig) ProtoMessage() {}
+
+func (x *DelayConfig) ProtoReflect() protoreflect.Message {
+	mi := &file_proxy_addons_proto_msgTypes[2]
+	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 DelayConfig.ProtoReflect.Descriptor instead.
+func (*DelayConfig) Descriptor() ([]byte, []int) {
+	return file_proxy_addons_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *DelayConfig) GetIsRandom() bool {
+	if x != nil {
+		return x.IsRandom
+	}
+	return false
+}
+
+func (x *DelayConfig) GetMinMillis() uint32 {
+	if x != nil {
+		return x.MinMillis
+	}
+	return 0
+}
+
+func (x *DelayConfig) GetMaxMillis() uint32 {
+	if x != nil {
+		return x.MaxMillis
+	}
+	return 0
+}
+
+type SchedulerConfig struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	TimeoutMillis uint32 `protobuf:"varint,1,opt,name=TimeoutMillis,proto3" json:"TimeoutMillis,omitempty"` // original traffic will not be sent right away but when scheduler want to send or pending buffer times out
+}
+
+func (x *SchedulerConfig) Reset() {
+	*x = SchedulerConfig{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proxy_addons_proto_msgTypes[3]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SchedulerConfig) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SchedulerConfig) ProtoMessage() {}
+
+func (x *SchedulerConfig) ProtoReflect() protoreflect.Message {
+	mi := &file_proxy_addons_proto_msgTypes[3]
+	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 SchedulerConfig.ProtoReflect.Descriptor instead.
+func (*SchedulerConfig) Descriptor() ([]byte, []int) {
+	return file_proxy_addons_proto_rawDescGZIP(), []int{3}
+}
+
+func (x *SchedulerConfig) GetTimeoutMillis() uint32 {
+	if x != nil {
+		return x.TimeoutMillis
+	}
+	return 0
+}
+
+var File_proxy_addons_proto protoreflect.FileDescriptor
+
+var file_proxy_addons_proto_rawDesc = []byte{
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+	0x6f, 0x33,
+}
+
+var (
+	file_proxy_addons_proto_rawDescOnce sync.Once
+	file_proxy_addons_proto_rawDescData = file_proxy_addons_proto_rawDesc
+)
+
+func file_proxy_addons_proto_rawDescGZIP() []byte {
+	file_proxy_addons_proto_rawDescOnce.Do(func() {
+		file_proxy_addons_proto_rawDescData = protoimpl.X.CompressGZIP(file_proxy_addons_proto_rawDescData)
+	})
+	return file_proxy_addons_proto_rawDescData
+}
+
+var file_proxy_addons_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
+var file_proxy_addons_proto_msgTypes = make([]protoimpl.MessageInfo, 4)
+var file_proxy_addons_proto_goTypes = []interface{}{
+	(SeedMode)(0),           // 0: xray.proxy.SeedMode
+	(*Addons)(nil),          // 1: xray.proxy.Addons
+	(*PaddingConfig)(nil),   // 2: xray.proxy.PaddingConfig
+	(*DelayConfig)(nil),     // 3: xray.proxy.DelayConfig
+	(*SchedulerConfig)(nil), // 4: xray.proxy.SchedulerConfig
+}
+var file_proxy_addons_proto_depIdxs = []int32{
+	0, // 0: xray.proxy.Addons.Mode:type_name -> xray.proxy.SeedMode
+	2, // 1: xray.proxy.Addons.Padding:type_name -> xray.proxy.PaddingConfig
+	3, // 2: xray.proxy.Addons.Delay:type_name -> xray.proxy.DelayConfig
+	4, // 3: xray.proxy.Addons.Scheduler:type_name -> xray.proxy.SchedulerConfig
+	4, // [4:4] is the sub-list for method output_type
+	4, // [4:4] is the sub-list for method input_type
+	4, // [4:4] is the sub-list for extension type_name
+	4, // [4:4] is the sub-list for extension extendee
+	0, // [0:4] is the sub-list for field type_name
+}
+
+func init() { file_proxy_addons_proto_init() }
+func file_proxy_addons_proto_init() {
+	if File_proxy_addons_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_proxy_addons_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Addons); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_proxy_addons_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*PaddingConfig); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_proxy_addons_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*DelayConfig); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_proxy_addons_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SchedulerConfig); 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_proxy_addons_proto_rawDesc,
+			NumEnums:      1,
+			NumMessages:   4,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_proxy_addons_proto_goTypes,
+		DependencyIndexes: file_proxy_addons_proto_depIdxs,
+		EnumInfos:         file_proxy_addons_proto_enumTypes,
+		MessageInfos:      file_proxy_addons_proto_msgTypes,
+	}.Build()
+	File_proxy_addons_proto = out.File
+	file_proxy_addons_proto_rawDesc = nil
+	file_proxy_addons_proto_goTypes = nil
+	file_proxy_addons_proto_depIdxs = nil
+}

proxy/addons.proto

@@ -1,16 +1,16 @@
 syntax = "proto3";
 
-package xray.proxy.vless.encoding;
+package xray.proxy;
-option csharp_namespace = "Xray.Proxy.Vless.Encoding";
+option csharp_namespace = "Xray.Proxy";
-option go_package = "github.com/xtls/xray-core/proxy/vless/encoding";
+option go_package = "github.com/xtls/xray-core/proxy";
-option java_package = "com.xray.proxy.vless.encoding";
+option java_package = "com.xray.proxy";
 option java_multiple_files = true;
 
 message Addons {
   string Flow = 1;
   bytes Seed = 2;
   SeedMode Mode = 3;
-  string Duration = 4;  // "0-8" means apply to number of packets, "1kb-" means start applying once both side exchange 1kb data, counting two-ways
+  string Duration = 4;  // "0-8" means apply to number of packets, "1000b-" means start applying once both side exchange 1kb data, counting two-ways
   PaddingConfig Padding = 5;
   DelayConfig Delay = 6;
   SchedulerConfig Scheduler = 7;

proxy/proxy.go

@@ -13,6 +13,7 @@ import (
 	"math/big"
 	"runtime"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/pires/go-proxyproto"
@@ -146,9 +147,9 @@ func NewTrafficState(userUUID []byte, flow string) *TrafficState {
 		RemainingPadding:         -1,
 		CurrentCommand:           0,
 		WriterSwitchToDirectCopy: false,
+		IsPadding:                true,
 	};
 	if len(flow) > 0 {
-		state.IsPadding = true;
 		state.WithinPaddingBuffers = true;
 	}
 	return &state
@@ -158,13 +159,15 @@ func NewTrafficState(userUUID []byte, flow string) *TrafficState {
 // Note Vision probably only make sense as the inner most layer of reader, since it need assess traffic state from origin proxy traffic
 type VisionReader struct {
 	buf.Reader
+	addons       *Addons
 	trafficState *TrafficState
 	ctx          context.Context
 }
 
-func NewVisionReader(reader buf.Reader, state *TrafficState, context context.Context) *VisionReader {
+func NewVisionReader(reader buf.Reader, addon *Addons, state *TrafficState, context context.Context) *VisionReader {
 	return &VisionReader{
 		Reader:       reader,
+		addons:       addon,
 		trafficState: state,
 		ctx:          context,
 	}
@@ -177,7 +180,7 @@ func (w *VisionReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
 			w.trafficState.StartTime = time.Now()
 		}
 		w.trafficState.ByteReceived += int64(buffer.Len())
-		if w.trafficState.WithinPaddingBuffers || w.trafficState.NumberOfPacketToFilter > 0 {
+		if w.trafficState.WithinPaddingBuffers || !ShouldStopSeed(w.addons, w.trafficState) {
 			mb2 := make(buf.MultiBuffer, 0, len(buffer))
 			for _, b := range buffer {
 				newbuffer := XtlsUnpadding(b, w.trafficState, w.ctx)
@@ -209,16 +212,18 @@ func (w *VisionReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
 // Note Vision probably only make sense as the inner most layer of writer, since it need assess traffic state from origin proxy traffic
 type VisionWriter struct {
 	buf.Writer
+	addons            *Addons
 	trafficState      *TrafficState
 	ctx               context.Context
 	writeOnceUserUUID []byte
 }
 
-func NewVisionWriter(writer buf.Writer, state *TrafficState, context context.Context) *VisionWriter {
+func NewVisionWriter(writer buf.Writer, addon *Addons, state *TrafficState, context context.Context) *VisionWriter {
 	w := make([]byte, len(state.UserUUID))
 	copy(w, state.UserUUID)
 	return &VisionWriter{
 		Writer:            writer,
+		addons:            addon,
 		trafficState:      state,
 		ctx:               context,
 		writeOnceUserUUID: w,
@@ -230,9 +235,9 @@ func (w *VisionWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
 	if w.trafficState.NumberOfPacketToFilter > 0 {
 		XtlsFilterTls(mb, w.trafficState, w.ctx)
 	}
-	if w.trafficState.IsPadding {
+	if w.trafficState.IsPadding && ShouldStartSeed(w.addons, w.trafficState){
 		if len(mb) == 1 && mb[0] == nil {
-			mb[0] = XtlsPadding(nil, CommandPaddingContinue, &w.writeOnceUserUUID, true, w.ctx) // we do a long padding to hide vless header
+			mb[0] = XtlsPadding(nil, CommandPaddingContinue, &w.writeOnceUserUUID, true, w.addons, w.ctx) // we do a long padding to hide vless header
 		} else {
 			mb = ReshapeMultiBuffer(w.ctx, mb)
 			longPadding := w.trafficState.IsTLS
@@ -243,18 +248,20 @@ func (w *VisionWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
 					}
 					var command byte = CommandPaddingContinue
 					if i == len(mb) - 1 {
-						command = CommandPaddingEnd
 						if w.trafficState.EnableXtls {
 							command = CommandPaddingDirect
+							w.trafficState.IsPadding = false
+						} else if ShouldStopSeed(w.addons, w.trafficState) {
+							command = CommandPaddingEnd
+							w.trafficState.IsPadding = false
 						}
 					}
-					mb[i] = XtlsPadding(b, command, &w.writeOnceUserUUID, true, w.ctx)
+					mb[i] = XtlsPadding(b, command, &w.writeOnceUserUUID, true, w.addons, w.ctx)
-					w.trafficState.IsPadding = false // padding going to end
 					longPadding = false
 					continue
-				} else if !w.trafficState.IsTLS12orAbove && w.trafficState.NumberOfPacketToFilter <= 1 { // For compatibility with earlier vision receiver, we finish padding 1 packet early
+				} else if !w.trafficState.IsTLS12orAbove && ShouldStopSeed(w.addons, w.trafficState) {
 					w.trafficState.IsPadding = false
-					mb[i] = XtlsPadding(b, CommandPaddingEnd, &w.writeOnceUserUUID, longPadding, w.ctx)
+					mb[i] = XtlsPadding(b, CommandPaddingEnd, &w.writeOnceUserUUID, longPadding, w.addons, w.ctx)
 					break
 				}
 				var command byte = CommandPaddingContinue
@@ -264,7 +271,7 @@ func (w *VisionWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
 						command = CommandPaddingDirect
 					}
 				}
-				mb[i] = XtlsPadding(b, command, &w.writeOnceUserUUID, longPadding, w.ctx)
+				mb[i] = XtlsPadding(b, command, &w.writeOnceUserUUID, longPadding, w.addons, w.ctx)
 			}
 		}
 	}
@@ -311,24 +318,24 @@ func ReshapeMultiBuffer(ctx context.Context, buffer buf.MultiBuffer) buf.MultiBu
 }
 
 // XtlsPadding add padding to eliminate length signature during tls handshake
-func XtlsPadding(b *buf.Buffer, command byte, userUUID *[]byte, longPadding bool, ctx context.Context) *buf.Buffer {
+func XtlsPadding(b *buf.Buffer, command byte, userUUID *[]byte, longPadding bool, addons *Addons, ctx context.Context) *buf.Buffer {
 	var contentLen int32 = 0
 	var paddingLen int32 = 0
 	if b != nil {
 		contentLen = b.Len()
 	}
-	if contentLen < 900 && longPadding {
+	if contentLen < int32(addons.Padding.LongMin) && longPadding {
-		l, err := rand.Int(rand.Reader, big.NewInt(500))
+		l, err := rand.Int(rand.Reader, big.NewInt(int64(addons.Padding.LongMax - addons.Padding.LongMin)))
 		if err != nil {
 			errors.LogDebugInner(ctx, err, "failed to generate padding")
 		}
-		paddingLen = int32(l.Int64()) + 900 - contentLen
+		paddingLen = int32(l.Int64()) + int32(addons.Padding.LongMin) - contentLen
 	} else {
-		l, err := rand.Int(rand.Reader, big.NewInt(256))
+		l, err := rand.Int(rand.Reader, big.NewInt(int64(addons.Padding.RegularMax - addons.Padding.RegularMin)))
 		if err != nil {
 			errors.LogDebugInner(ctx, err, "failed to generate padding")
 		}
-		paddingLen = int32(l.Int64())
+		paddingLen = int32(l.Int64()) + int32(addons.Padding.RegularMin)
 	}
 	if paddingLen > buf.Size-21-contentLen {
 		paddingLen = buf.Size - 21 - contentLen
@@ -583,3 +590,50 @@ func readV(ctx context.Context, reader buf.Reader, writer buf.Writer, timer sign
 	}
 	return nil
 }
+
+func ShouldStartSeed(addons *Addons, trafficState *TrafficState) bool {
+	if len(addons.Duration) == 0 || len(strings.Split(addons.Duration, "-")) < 2 {
+		return false
+	}
+	start := strings.ToLower(strings.Split(addons.Duration, "-")[0])
+	if len(start) == 0 {
+		return true
+	}
+	if strings.Contains(start, "b") {
+		start = strings.TrimRight(start, "b")
+		i, err := strconv.Atoi(start)
+		if err == nil && i <= int(trafficState.ByteSent + trafficState.ByteSent) {
+			return true
+		}
+	} else {
+		i, err := strconv.Atoi(start)
+		if err == nil && i <= trafficState.NumberOfPacketSent + trafficState.NumberOfPacketReceived {
+			return true
+		}
+	}
+	return false
+}
+
+func ShouldStopSeed(addons *Addons, trafficState *TrafficState) bool {
+	if len(addons.Duration) == 0 || len(strings.Split(addons.Duration, "-")) < 2 {
+		return true
+	}
+	start := strings.ToLower(strings.Split(addons.Duration, "-")[1])
+	if len(start) == 0 { // infinite
+		return false
+	}
+	if strings.Contains(start, "b") {
+		start = strings.TrimRight(start, "b")
+		i, err := strconv.Atoi(start)
+		if err == nil && i > int(trafficState.ByteSent + trafficState.ByteSent) {
+			return false
+		}
+	} else {
+		i, err := strconv.Atoi(start)
+		if err == nil && i > trafficState.NumberOfPacketSent + trafficState.NumberOfPacketReceived {
+			return false
+		}
+	}
+	return true
+}
+

proxy/vless/encoding/addons.go

@@ -13,7 +13,7 @@ import (
 	"google.golang.org/protobuf/proto"
 )
 
-func EncodeHeaderAddons(buffer *buf.Buffer, addons *Addons) error {
+func EncodeHeaderAddons(buffer *buf.Buffer, addons *proxy.Addons) error {
 	if addons.Flow == vless.XRV || len(addons.Seed) > 0 {
 		bytes, err := proto.Marshal(addons)
 		if err != nil {
@@ -33,8 +33,8 @@ func EncodeHeaderAddons(buffer *buf.Buffer, addons *Addons) error {
 	return nil
 }
 
-func DecodeHeaderAddons(buffer *buf.Buffer, reader io.Reader) (*Addons, error) {
+func DecodeHeaderAddons(buffer *buf.Buffer, reader io.Reader) (*proxy.Addons, error) {
-	addons := new(Addons)
+	addons := new(proxy.Addons)
 	buffer.Clear()
 	if _, err := buffer.ReadFullFrom(reader, 1); err != nil {
 		return nil, errors.New("failed to read addons protobuf length").Base(err)
@@ -55,8 +55,8 @@ func DecodeHeaderAddons(buffer *buf.Buffer, reader io.Reader) (*Addons, error) {
 }
 
 // EncodeBodyAddons returns a Writer that auto-encrypt content written by caller.
-func EncodeBodyAddons(writer buf.Writer, request *protocol.RequestHeader, requestAddons *Addons, state *proxy.TrafficState, context context.Context) buf.Writer {
+func EncodeBodyAddons(writer buf.Writer, request *protocol.RequestHeader, addons *proxy.Addons, state *proxy.TrafficState, context context.Context) buf.Writer {
-	w := proxy.NewVisionWriter(writer, state, context)
+	w := proxy.NewVisionWriter(writer, addons, state, context)
 	if request.Command == protocol.RequestCommandUDP {
 		return NewMultiLengthPacketWriter(w)
 	}
@@ -64,8 +64,8 @@ func EncodeBodyAddons(writer buf.Writer, request *protocol.RequestHeader, reques
 }
 
 // DecodeBodyAddons returns a Reader from which caller can fetch decrypted body.
-func DecodeBodyAddons(reader io.Reader, request *protocol.RequestHeader, addons *Addons, state *proxy.TrafficState, context context.Context) buf.Reader {
+func DecodeBodyAddons(reader io.Reader, request *protocol.RequestHeader, addons *proxy.Addons, state *proxy.TrafficState, context context.Context) buf.Reader {
-	r := proxy.NewVisionReader(buf.NewReader(reader), state, context)
+	r := proxy.NewVisionReader(buf.NewReader(reader), addons, state, context)
 	if request.Command == protocol.RequestCommandUDP {
 		return NewLengthPacketReader(&buf.BufferedReader{Reader: r})
 	}
@@ -178,32 +178,46 @@ func (r *LengthPacketReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
 	return mb, nil
 }
 
-func PopulateSeed(seed string, addons *Addons) {
+func PopulateSeed(seed string, addons *proxy.Addons) {
 	if len(seed) > 0 {
 		addons.Seed = []byte {1} // only turn on, more TBD
-		addons.Mode = SeedMode_PaddingPlusDelay
+		addons.Mode = proxy.SeedMode_PaddingPlusDelay
 		addons.Duration = "0-8"
-		addons.Padding = &PaddingConfig{
+		addons.Padding = &proxy.PaddingConfig{
 			RegularMin: 0,
 			RegularMax: 256,
 			LongMin:    900,
 			LongMax:    1400,
 		}
-		addons.Delay = &DelayConfig{
+		addons.Delay = &proxy.DelayConfig{
 			IsRandom: true,
 			MinMillis: 100,
 			MaxMillis: 500,
 		}
-		addons.Scheduler = &SchedulerConfig{
+		addons.Scheduler = &proxy.SchedulerConfig{
 			TimeoutMillis: 600,
 		}
+	} else if addons.Flow == vless.XRV {
+		addons.Seed = []byte {1} // only turn on, more TBD
+		addons.Mode = proxy.SeedMode_PaddingOnly
+		addons.Duration = "0-8"
+		addons.Padding = &proxy.PaddingConfig{
+			RegularMin: 0,
+			RegularMax: 256,
+			LongMin:    900,
+			LongMax:    1400,
+		}
 	}
 }
 
-func CheckSeed(requestAddons *Addons, responseAddons *Addons) error {
+func CheckSeed(requestAddons *proxy.Addons, responseAddons *proxy.Addons) error {
 	if !bytes.Equal(requestAddons.Seed, responseAddons.Seed) {
 		return errors.New("Seed bytes not match", requestAddons.Seed, responseAddons.Seed)
 	}
+	if responseAddons.Flow == vless.XRV && len(responseAddons.Seed) == 0 && requestAddons.Mode == proxy.SeedMode_Unknown {
+		// old vision server config allow empty seed from clients for backwards compatibility
+		return nil
+	}
 	if requestAddons.Mode != responseAddons.Mode {
 		return errors.New("Mode not match", requestAddons.Mode, responseAddons.Mode)
 	}

proxy/vless/encoding/encoding.go

@@ -28,7 +28,7 @@ var addrParser = protocol.NewAddressParser(
 )
 
 // EncodeRequestHeader writes encoded request header into the given writer.
-func EncodeRequestHeader(writer io.Writer, request *protocol.RequestHeader, requestAddons *Addons) error {
+func EncodeRequestHeader(writer io.Writer, request *protocol.RequestHeader, requestAddons *proxy.Addons) error {
 	buffer := buf.StackNew()
 	defer buffer.Release()
 
@@ -62,7 +62,7 @@ func EncodeRequestHeader(writer io.Writer, request *protocol.RequestHeader, requ
 }
 
 // DecodeRequestHeader decodes and returns (if successful) a RequestHeader from an input stream.
-func DecodeRequestHeader(isfb bool, first *buf.Buffer, reader io.Reader, validator vless.Validator) (*protocol.RequestHeader, *Addons, bool, error) {
+func DecodeRequestHeader(isfb bool, first *buf.Buffer, reader io.Reader, validator vless.Validator) (*protocol.RequestHeader, *proxy.Addons, bool, error) {
 	buffer := buf.StackNew()
 	defer buffer.Release()
 
@@ -131,7 +131,7 @@ func DecodeRequestHeader(isfb bool, first *buf.Buffer, reader io.Reader, validat
 }
 
 // EncodeResponseHeader writes encoded response header into the given writer.
-func EncodeResponseHeader(writer io.Writer, request *protocol.RequestHeader, responseAddons *Addons) error {
+func EncodeResponseHeader(writer io.Writer, request *protocol.RequestHeader, responseAddons *proxy.Addons) error {
 	buffer := buf.StackNew()
 	defer buffer.Release()
 
@@ -151,7 +151,7 @@ func EncodeResponseHeader(writer io.Writer, request *protocol.RequestHeader, res
 }
 
 // DecodeResponseHeader decodes and returns (if successful) a ResponseHeader from an input stream.
-func DecodeResponseHeader(reader io.Reader, request *protocol.RequestHeader) (*Addons, error) {
+func DecodeResponseHeader(reader io.Reader, request *protocol.RequestHeader) (*proxy.Addons, error) {
 	buffer := buf.StackNew()
 	defer buffer.Release()
 

proxy/vless/encoding/encoding_test.go

@@ -9,6 +9,7 @@ import (
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/protocol"
 	"github.com/xtls/xray-core/common/uuid"
+	"github.com/xtls/xray-core/proxy"
 	"github.com/xtls/xray-core/proxy/vless"
 	. "github.com/xtls/xray-core/proxy/vless/encoding"
 )
@@ -37,7 +38,7 @@ func TestRequestSerialization(t *testing.T) {
 		Address: net.DomainAddress("www.example.com"),
 		Port:    net.Port(443),
 	}
-	expectedAddons := &Addons{}
+	expectedAddons := &proxy.Addons{}
 
 	buffer := buf.StackNew()
 	common.Must(EncodeRequestHeader(&buffer, expectedRequest, expectedAddons))
@@ -52,7 +53,7 @@ func TestRequestSerialization(t *testing.T) {
 		t.Error(r)
 	}
 
-	addonsComparer := func(x, y *Addons) bool {
+	addonsComparer := func(x, y *proxy.Addons) bool {
 		return (x.Flow == y.Flow) && (cmp.Equal(x.Seed, y.Seed))
 	}
 	if r := cmp.Diff(actualAddons, expectedAddons, cmp.Comparer(addonsComparer)); r != "" {
@@ -78,7 +79,7 @@ func TestInvalidRequest(t *testing.T) {
 		Address: net.DomainAddress("www.example.com"),
 		Port:    net.Port(443),
 	}
-	expectedAddons := &Addons{}
+	expectedAddons := &proxy.Addons{}
 
 	buffer := buf.StackNew()
 	common.Must(EncodeRequestHeader(&buffer, expectedRequest, expectedAddons))
@@ -109,7 +110,7 @@ func TestMuxRequest(t *testing.T) {
 		Command: protocol.RequestCommandMux,
 		Address: net.DomainAddress("v1.mux.cool"),
 	}
-	expectedAddons := &Addons{}
+	expectedAddons := &proxy.Addons{}
 
 	buffer := buf.StackNew()
 	common.Must(EncodeRequestHeader(&buffer, expectedRequest, expectedAddons))
@@ -124,7 +125,7 @@ func TestMuxRequest(t *testing.T) {
 		t.Error(r)
 	}
 
-	addonsComparer := func(x, y *Addons) bool {
+	addonsComparer := func(x, y *proxy.Addons) bool {
 		return (x.Flow == y.Flow) && (cmp.Equal(x.Seed, y.Seed))
 	}
 	if r := cmp.Diff(actualAddons, expectedAddons, cmp.Comparer(addonsComparer)); r != "" {

proxy/vless/inbound/inbound.go

@@ -215,7 +215,7 @@ func (h *Handler) Process(ctx context.Context, network net.Network, connection s
 	}
 
 	var request *protocol.RequestHeader
-	var requestAddons *encoding.Addons
+	var requestAddons *proxy.Addons
 	var err error
 
 	napfb := h.fallbacks
@@ -455,7 +455,7 @@ func (h *Handler) Process(ctx context.Context, network net.Network, connection s
 
 	account := request.User.Account.(*vless.MemoryAccount)
 
-	responseAddons := &encoding.Addons{
+	responseAddons := &proxy.Addons{
 		// Flow: requestAddons.Flow,
 	}
 	encoding.PopulateSeed(account.Seed, responseAddons)
@@ -536,7 +536,7 @@ func (h *Handler) Process(ctx context.Context, network net.Network, connection s
 		defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
 
 		// default: clientReader := reader
-		clientReader := encoding.DecodeBodyAddons(reader, request, requestAddons, trafficState, ctx)
+		clientReader := encoding.DecodeBodyAddons(reader, request, responseAddons, trafficState, ctx)
 
 		var err error
 
@@ -564,7 +564,7 @@ func (h *Handler) Process(ctx context.Context, network net.Network, connection s
 		}
 
 		// default: clientWriter := bufferWriter
-		clientWriter := encoding.EncodeBodyAddons(bufferWriter, request, requestAddons, trafficState, ctx)
+		clientWriter := encoding.EncodeBodyAddons(bufferWriter, request, responseAddons, trafficState, ctx)
 		multiBuffer, err1 := serverReader.ReadMultiBuffer()
 		if err1 != nil {
 			return err1 // ...

proxy/vless/outbound/outbound.go

@@ -116,7 +116,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 
 	account := request.User.Account.(*vless.MemoryAccount)
 
-	requestAddons := &encoding.Addons{
+	requestAddons := &proxy.Addons{
 		Flow: account.Flow,
 	}
 	encoding.PopulateSeed(account.Seed, requestAddons)