Finalmask: Add XDNS (relies mKCP, like DNSTT), header-*, mkcp-* (#5560)

And https://github.com/XTLS/Xray-core/pull/5560#issuecomment-3825430761

infra/conf/transport_authenticators.go

@@ -4,72 +4,17 @@ import (
 	"sort"
 
 	"github.com/xtls/xray-core/common/errors"
-	"github.com/xtls/xray-core/transport/internet/headers/dns"
 	"github.com/xtls/xray-core/transport/internet/headers/http"
 	"github.com/xtls/xray-core/transport/internet/headers/noop"
-	"github.com/xtls/xray-core/transport/internet/headers/srtp"
-	"github.com/xtls/xray-core/transport/internet/headers/tls"
-	"github.com/xtls/xray-core/transport/internet/headers/utp"
-	"github.com/xtls/xray-core/transport/internet/headers/wechat"
-	"github.com/xtls/xray-core/transport/internet/headers/wireguard"
 	"google.golang.org/protobuf/proto"
 )
 
-type NoOpAuthenticator struct{}
-
-func (NoOpAuthenticator) Build() (proto.Message, error) {
-	return new(noop.Config), nil
-}
-
 type NoOpConnectionAuthenticator struct{}
 
 func (NoOpConnectionAuthenticator) Build() (proto.Message, error) {
 	return new(noop.ConnectionConfig), nil
 }
 
-type SRTPAuthenticator struct{}
-
-func (SRTPAuthenticator) Build() (proto.Message, error) {
-	return new(srtp.Config), nil
-}
-
-type UTPAuthenticator struct{}
-
-func (UTPAuthenticator) Build() (proto.Message, error) {
-	return new(utp.Config), nil
-}
-
-type WechatVideoAuthenticator struct{}
-
-func (WechatVideoAuthenticator) Build() (proto.Message, error) {
-	return new(wechat.VideoConfig), nil
-}
-
-type WireguardAuthenticator struct{}
-
-func (WireguardAuthenticator) Build() (proto.Message, error) {
-	return new(wireguard.WireguardConfig), nil
-}
-
-type DNSAuthenticator struct {
-	Domain string `json:"domain"`
-}
-
-func (v *DNSAuthenticator) Build() (proto.Message, error) {
-	config := new(dns.Config)
-	config.Domain = "www.baidu.com"
-	if len(v.Domain) > 0 {
-		config.Domain = v.Domain
-	}
-	return config, nil
-}
-
-type DTLSAuthenticator struct{}
-
-func (DTLSAuthenticator) Build() (proto.Message, error) {
-	return new(tls.PacketConfig), nil
-}
-
 type AuthenticatorRequest struct {
 	Version string                 `json:"version"`
 	Method  string                 `json:"method"`

infra/conf/transport_internet.go

@@ -16,7 +16,16 @@ import (
 	"github.com/xtls/xray-core/common/platform/filesystem"
 	"github.com/xtls/xray-core/common/serial"
 	"github.com/xtls/xray-core/transport/internet"
+	"github.com/xtls/xray-core/transport/internet/finalmask/header/dns"
+	"github.com/xtls/xray-core/transport/internet/finalmask/header/dtls"
+	"github.com/xtls/xray-core/transport/internet/finalmask/header/srtp"
+	"github.com/xtls/xray-core/transport/internet/finalmask/header/utp"
+	"github.com/xtls/xray-core/transport/internet/finalmask/header/wechat"
+	"github.com/xtls/xray-core/transport/internet/finalmask/header/wireguard"
+	"github.com/xtls/xray-core/transport/internet/finalmask/mkcp/aes128gcm"
+	"github.com/xtls/xray-core/transport/internet/finalmask/mkcp/original"
 	"github.com/xtls/xray-core/transport/internet/finalmask/salamander"
+	"github.com/xtls/xray-core/transport/internet/finalmask/xdns"
 	"github.com/xtls/xray-core/transport/internet/httpupgrade"
 	"github.com/xtls/xray-core/transport/internet/hysteria"
 	"github.com/xtls/xray-core/transport/internet/kcp"
@@ -29,16 +38,6 @@ import (
 )
 
 var (
-	kcpHeaderLoader = NewJSONConfigLoader(ConfigCreatorCache{
-		"none":         func() interface{} { return new(NoOpAuthenticator) },
-		"srtp":         func() interface{} { return new(SRTPAuthenticator) },
-		"utp":          func() interface{} { return new(UTPAuthenticator) },
-		"wechat-video": func() interface{} { return new(WechatVideoAuthenticator) },
-		"dtls":         func() interface{} { return new(DTLSAuthenticator) },
-		"wireguard":    func() interface{} { return new(WireguardAuthenticator) },
-		"dns":          func() interface{} { return new(DNSAuthenticator) },
-	}, "type", "")
-
 	tcpHeaderLoader = NewJSONConfigLoader(ConfigCreatorCache{
 		"none": func() interface{} { return new(NoOpConnectionAuthenticator) },
 		"http": func() interface{} { return new(Authenticator) },
@@ -63,9 +62,9 @@ func (c *KCPConfig) Build() (proto.Message, error) {
 
 	if c.Mtu != nil {
 		mtu := *c.Mtu
-		if mtu < 576 || mtu > 1460 {
-			return nil, errors.New("invalid mKCP MTU size: ", mtu).AtError()
-		}
+		// if mtu < 576 || mtu > 1460 {
+		// 	return nil, errors.New("invalid mKCP MTU size: ", mtu).AtError()
+		// }
 		config.Mtu = &kcp.MTU{Value: mtu}
 	}
 	if c.Tti != nil {
@@ -100,20 +99,8 @@ func (c *KCPConfig) Build() (proto.Message, error) {
 			config.WriteBuffer = &kcp.WriteBuffer{Size: 512 * 1024}
 		}
 	}
-	if len(c.HeaderConfig) > 0 {
-		headerConfig, _, err := kcpHeaderLoader.Load(c.HeaderConfig)
-		if err != nil {
-			return nil, errors.New("invalid mKCP header config.").Base(err).AtError()
-		}
-		ts, err := headerConfig.(Buildable).Build()
-		if err != nil {
-			return nil, errors.New("invalid mKCP header config").Base(err).AtError()
-		}
-		config.HeaderConfig = serial.ToTypedMessage(ts)
-	}
-
-	if c.Seed != nil {
-		config.Seed = &kcp.EncryptionSeed{Seed: *c.Seed}
+	if c.HeaderConfig != nil || c.Seed != nil {
+		return nil, errors.PrintRemovedFeatureError("mkcp header & seed", "finalmask/udp header-* & mkcp-original & mkcp-aes128gcm")
 	}
 
 	return config, nil
@@ -1242,10 +1229,80 @@ func (c *SocketConfig) Build() (*internet.SocketConfig, error) {
 
 var (
 	udpmaskLoader = NewJSONConfigLoader(ConfigCreatorCache{
-		"salamander": func() interface{} { return new(Salamander) },
+		"header-dns":       func() interface{} { return new(Dns) },
+		"header-dtls":      func() interface{} { return new(Dtls) },
+		"header-srtp":      func() interface{} { return new(Srtp) },
+		"header-utp":       func() interface{} { return new(Utp) },
+		"header-wechat":    func() interface{} { return new(Wechat) },
+		"header-wireguard": func() interface{} { return new(Wireguard) },
+		"mkcp-original":    func() interface{} { return new(Original) },
+		"mkcp-aes128gcm":   func() interface{} { return new(Aes128Gcm) },
+		"salamander":       func() interface{} { return new(Salamander) },
+		"xdns":             func() interface{} { return new(Xdns) },
 	}, "type", "settings")
 )
 
+type Dns struct {
+	Domain string `json:"domain"`
+}
+
+func (c *Dns) Build() (proto.Message, error) {
+	config := &dns.Config{}
+	config.Domain = "www.baidu.com"
+
+	if len(c.Domain) > 0 {
+		config.Domain = c.Domain
+	}
+
+	return config, nil
+}
+
+type Dtls struct{}
+
+func (c *Dtls) Build() (proto.Message, error) {
+	return &dtls.Config{}, nil
+}
+
+type Srtp struct{}
+
+func (c *Srtp) Build() (proto.Message, error) {
+	return &srtp.Config{}, nil
+}
+
+type Utp struct{}
+
+func (c *Utp) Build() (proto.Message, error) {
+	return &utp.Config{}, nil
+}
+
+type Wechat struct{}
+
+func (c *Wechat) Build() (proto.Message, error) {
+	return &wechat.Config{}, nil
+}
+
+type Wireguard struct{}
+
+func (c *Wireguard) Build() (proto.Message, error) {
+	return &wireguard.Config{}, nil
+}
+
+type Original struct{}
+
+func (c *Original) Build() (proto.Message, error) {
+	return &original.Config{}, nil
+}
+
+type Aes128Gcm struct {
+	Password string `json:"password"`
+}
+
+func (c *Aes128Gcm) Build() (proto.Message, error) {
+	return &aes128gcm.Config{
+		Password: c.Password,
+	}, nil
+}
+
 type Salamander struct {
 	Password string `json:"password"`
 }
@@ -1256,14 +1313,28 @@ func (c *Salamander) Build() (proto.Message, error) {
 	return config, nil
 }
 
-type FinalMask struct {
+type Xdns struct {
+	Domain string `json:"domain"`
+}
+
+func (c *Xdns) Build() (proto.Message, error) {
+	if c.Domain == "" {
+		return nil, errors.New("empty domain")
+	}
+
+	return &xdns.Config{
+		Domain: c.Domain,
+	}, nil
+}
+
+type Mask struct {
 	Type     string           `json:"type"`
 	Settings *json.RawMessage `json:"settings"`
 }
 
-func (c *FinalMask) Build(tcpmaskLoader bool) (proto.Message, error) {
+func (c *Mask) Build(tcp bool) (proto.Message, error) {
 	loader := udpmaskLoader
-	if tcpmaskLoader {
+	if tcp {
 		return nil, errors.New("")
 	}
 
@@ -1282,12 +1353,17 @@ func (c *FinalMask) Build(tcpmaskLoader bool) (proto.Message, error) {
 	return ts, nil
 }
 
+type FinalMask struct {
+	Tcp []Mask `json:"tcp"`
+	Udp []Mask `json:"udp"`
+}
+
 type StreamConfig struct {
 	Address             *Address           `json:"address"`
 	Port                uint16             `json:"port"`
 	Network             *TransportProtocol `json:"network"`
 	Security            string             `json:"security"`
-	Udpmasks            []*FinalMask       `json:"udpmasks"`
+	FinalMask           *FinalMask         `json:"finalmask"`
 	TLSSettings         *TLSConfig         `json:"tlsSettings"`
 	REALITYSettings     *REALITYConfig     `json:"realitySettings"`
 	RAWSettings         *TCPConfig         `json:"rawSettings"`
@@ -1437,12 +1513,21 @@ func (c *StreamConfig) Build() (*internet.StreamConfig, error) {
 		config.SocketSettings = ss
 	}
 
-	for _, mask := range c.Udpmasks {
-		u, err := mask.Build(false)
-		if err != nil {
-			return nil, errors.New("failed to build mask with type ", mask.Type).Base(err)
+	if c.FinalMask != nil {
+		for _, mask := range c.FinalMask.Tcp {
+			u, err := mask.Build(true)
+			if err != nil {
+				return nil, errors.New("failed to build mask with type ", mask.Type).Base(err)
+			}
+			config.Tcpmasks = append(config.Tcpmasks, serial.ToTypedMessage(u))
+		}
+		for _, mask := range c.FinalMask.Udp {
+			u, err := mask.Build(false)
+			if err != nil {
+				return nil, errors.New("failed to build mask with type ", mask.Type).Base(err)
+			}
+			config.Udpmasks = append(config.Udpmasks, serial.ToTypedMessage(u))
 		}
-		config.Udpmasks = append(config.Udpmasks, serial.ToTypedMessage(u))
 	}
 
 	return config, nil

main/distro/all/all.go

@@ -63,11 +63,6 @@ import (
 	// Transport headers
 	_ "github.com/xtls/xray-core/transport/internet/headers/http"
 	_ "github.com/xtls/xray-core/transport/internet/headers/noop"
-	_ "github.com/xtls/xray-core/transport/internet/headers/srtp"
-	_ "github.com/xtls/xray-core/transport/internet/headers/tls"
-	_ "github.com/xtls/xray-core/transport/internet/headers/utp"
-	_ "github.com/xtls/xray-core/transport/internet/headers/wechat"
-	_ "github.com/xtls/xray-core/transport/internet/headers/wireguard"
 
 	// JSON & TOML & YAML
 	_ "github.com/xtls/xray-core/main/json"

transport/internet/finalmask/finalmask.go

@@ -4,17 +4,15 @@ import (
 	"net"
 )
 
+type ConnSize interface {
+	Size() int32
+}
+
 type Udpmask interface {
 	UDP()
 
-	WrapConnClient(net.Conn) (net.Conn, error)
-	WrapConnServer(net.Conn) (net.Conn, error)
-
-	WrapPacketConnClient(net.PacketConn) (net.PacketConn, error)
-	WrapPacketConnServer(net.PacketConn) (net.PacketConn, error)
-
-	Size() int
-	Serialize([]byte)
+	WrapPacketConnClient(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error)
+	WrapPacketConnServer(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error)
 }
 
 type UdpmaskManager struct {
@@ -27,66 +25,32 @@ func NewUdpmaskManager(udpmasks []Udpmask) *UdpmaskManager {
 	}
 }
 
-func (m *UdpmaskManager) WrapConnClient(raw net.Conn) (net.Conn, error) {
-	var err error
-	for _, mask := range m.udpmasks {
-		raw, err = mask.WrapConnClient(raw)
-		if err != nil {
-			return nil, err
-		}
-	}
-	return raw, nil
-}
-
-func (m *UdpmaskManager) WrapConnServer(raw net.Conn) (net.Conn, error) {
-	var err error
-	for _, mask := range m.udpmasks {
-		raw, err = mask.WrapConnServer(raw)
-		if err != nil {
-			return nil, err
-		}
-	}
-	return raw, nil
-}
-
 func (m *UdpmaskManager) WrapPacketConnClient(raw net.PacketConn) (net.PacketConn, error) {
+	leaveSize := int32(0)
 	var err error
-	for _, mask := range m.udpmasks {
-		raw, err = mask.WrapPacketConnClient(raw)
+	for i, mask := range m.udpmasks {
+		raw, err = mask.WrapPacketConnClient(raw, i == len(m.udpmasks)-1, leaveSize, i == 0)
 		if err != nil {
 			return nil, err
 		}
+		leaveSize += raw.(ConnSize).Size()
 	}
 	return raw, nil
 }
 
 func (m *UdpmaskManager) WrapPacketConnServer(raw net.PacketConn) (net.PacketConn, error) {
+	leaveSize := int32(0)
 	var err error
-	for _, mask := range m.udpmasks {
-		raw, err = mask.WrapPacketConnServer(raw)
+	for i, mask := range m.udpmasks {
+		raw, err = mask.WrapPacketConnServer(raw, i == len(m.udpmasks)-1, leaveSize, i == 0)
 		if err != nil {
 			return nil, err
 		}
+		leaveSize += raw.(ConnSize).Size()
 	}
 	return raw, nil
 }
 
-func (m *UdpmaskManager) Size() int {
-	size := 0
-	for _, mask := range m.udpmasks {
-		size += mask.Size()
-	}
-	return size
-}
-
-func (m *UdpmaskManager) Serialize(b []byte) {
-	index := 0
-	for _, mask := range m.udpmasks {
-		mask.Serialize(b[index:])
-		index += mask.Size()
-	}
-}
-
 type Tcpmask interface {
 	TCP()
 

transport/internet/finalmask/header/dns/config.go

@@ -0,0 +1,16 @@
+package dns
+
+import (
+	"net"
+)
+
+func (c *Config) UDP() {
+}
+
+func (c *Config) WrapPacketConnClient(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error) {
+	return NewConnClient(c, raw, first, leaveSize)
+}
+
+func (c *Config) WrapPacketConnServer(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error) {
+	return NewConnServer(c, raw, first, leaveSize)
+}

transport/internet/finalmask/header/dns/config.pb.go

@@ -0,0 +1,123 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.36.10
+// 	protoc        v6.33.1
+// source: transport/internet/finalmask/header/dns/config.proto
+
+package dns
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+	unsafe "unsafe"
+)
+
+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 Config struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Domain        string                 `protobuf:"bytes,1,opt,name=domain,proto3" json:"domain,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *Config) Reset() {
+	*x = Config{}
+	mi := &file_transport_internet_finalmask_header_dns_config_proto_msgTypes[0]
+	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_transport_internet_finalmask_header_dns_config_proto_msgTypes[0]
+	if 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_transport_internet_finalmask_header_dns_config_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Config) GetDomain() string {
+	if x != nil {
+		return x.Domain
+	}
+	return ""
+}
+
+var File_transport_internet_finalmask_header_dns_config_proto protoreflect.FileDescriptor
+
+const file_transport_internet_finalmask_header_dns_config_proto_rawDesc = "" +
+	"\n" +
+	"4transport/internet/finalmask/header/dns/config.proto\x12,xray.transport.internet.finalmask.header.dns\" \n" +
+	"\x06Config\x12\x16\n" +
+	"\x06domain\x18\x01 \x01(\tR\x06domainB\xa6\x01\n" +
+	"0com.xray.transport.internet.finalmask.header.dnsP\x01ZAgithub.com/xtls/xray-core/transport/internet/finalmask/header/dns\xaa\x02,Xray.Transport.Internet.Finalmask.Header.Dnsb\x06proto3"
+
+var (
+	file_transport_internet_finalmask_header_dns_config_proto_rawDescOnce sync.Once
+	file_transport_internet_finalmask_header_dns_config_proto_rawDescData []byte
+)
+
+func file_transport_internet_finalmask_header_dns_config_proto_rawDescGZIP() []byte {
+	file_transport_internet_finalmask_header_dns_config_proto_rawDescOnce.Do(func() {
+		file_transport_internet_finalmask_header_dns_config_proto_rawDescData = protoimpl.X.CompressGZIP(unsafe.Slice(unsafe.StringData(file_transport_internet_finalmask_header_dns_config_proto_rawDesc), len(file_transport_internet_finalmask_header_dns_config_proto_rawDesc)))
+	})
+	return file_transport_internet_finalmask_header_dns_config_proto_rawDescData
+}
+
+var file_transport_internet_finalmask_header_dns_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_transport_internet_finalmask_header_dns_config_proto_goTypes = []any{
+	(*Config)(nil), // 0: xray.transport.internet.finalmask.header.dns.Config
+}
+var file_transport_internet_finalmask_header_dns_config_proto_depIdxs = []int32{
+	0, // [0:0] is the sub-list for method output_type
+	0, // [0:0] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_transport_internet_finalmask_header_dns_config_proto_init() }
+func file_transport_internet_finalmask_header_dns_config_proto_init() {
+	if File_transport_internet_finalmask_header_dns_config_proto != nil {
+		return
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: unsafe.Slice(unsafe.StringData(file_transport_internet_finalmask_header_dns_config_proto_rawDesc), len(file_transport_internet_finalmask_header_dns_config_proto_rawDesc)),
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_transport_internet_finalmask_header_dns_config_proto_goTypes,
+		DependencyIndexes: file_transport_internet_finalmask_header_dns_config_proto_depIdxs,
+		MessageInfos:      file_transport_internet_finalmask_header_dns_config_proto_msgTypes,
+	}.Build()
+	File_transport_internet_finalmask_header_dns_config_proto = out.File
+	file_transport_internet_finalmask_header_dns_config_proto_goTypes = nil
+	file_transport_internet_finalmask_header_dns_config_proto_depIdxs = nil
+}

transport/internet/finalmask/header/dns/config.proto

@@ -0,0 +1,11 @@
+syntax = "proto3";
+
+package xray.transport.internet.finalmask.header.dns;
+option csharp_namespace = "Xray.Transport.Internet.Finalmask.Header.Dns";
+option go_package = "github.com/xtls/xray-core/transport/internet/finalmask/header/dns";
+option java_package = "com.xray.transport.internet.finalmask.header.dns";
+option java_multiple_files = true;
+
+message Config {
+    string domain = 1;    
+}

transport/internet/finalmask/header/dns/conn.go

@@ -0,0 +1,241 @@
+package dns
+
+import (
+	"encoding/binary"
+	"io"
+	"net"
+	sync "sync"
+	"time"
+
+	"github.com/xtls/xray-core/common/dice"
+	"github.com/xtls/xray-core/common/errors"
+)
+
+func packDomainName(s string, msg []byte) (off1 int, err error) {
+	off := 0
+	ls := len(s)
+	// Each dot ends a segment of the name.
+	// We trade each dot byte for a length byte.
+	// Except for escaped dots (\.), which are normal dots.
+	// There is also a trailing zero.
+
+	// Emit sequence of counted strings, chopping at dots.
+	var (
+		begin int
+		bs    []byte
+	)
+	for i := 0; i < ls; i++ {
+		var c byte
+		if bs == nil {
+			c = s[i]
+		} else {
+			c = bs[i]
+		}
+
+		switch c {
+		case '\\':
+			if off+1 > len(msg) {
+				return len(msg), errors.New("buffer size too small")
+			}
+
+			if bs == nil {
+				bs = []byte(s)
+			}
+
+			copy(bs[i:ls-1], bs[i+1:])
+			ls--
+		case '.':
+			labelLen := i - begin
+			if labelLen >= 1<<6 { // top two bits of length must be clear
+				return len(msg), errors.New("bad rdata")
+			}
+
+			// off can already (we're in a loop) be bigger than len(msg)
+			// this happens when a name isn't fully qualified
+			if off+1+labelLen > len(msg) {
+				return len(msg), errors.New("buffer size too small")
+			}
+
+			// The following is covered by the length check above.
+			msg[off] = byte(labelLen)
+
+			if bs == nil {
+				copy(msg[off+1:], s[begin:i])
+			} else {
+				copy(msg[off+1:], bs[begin:i])
+			}
+			off += 1 + labelLen
+			begin = i + 1
+		default:
+		}
+	}
+
+	if off < len(msg) {
+		msg[off] = 0
+	}
+
+	return off + 1, nil
+}
+
+type dns struct {
+	header []byte
+}
+
+func (h *dns) Size() int32 {
+	return int32(len(h.header))
+}
+
+func (h *dns) Serialize(b []byte) {
+	copy(b, h.header)
+	binary.BigEndian.PutUint16(b[0:], dice.RollUint16())
+}
+
+type dnsConn struct {
+	first     bool
+	leaveSize int32
+
+	conn   net.PacketConn
+	header *dns
+
+	readBuf    []byte
+	readMutex  sync.Mutex
+	writeBuf   []byte
+	writeMutex sync.Mutex
+}
+
+func NewConnClient(c *Config, raw net.PacketConn, first bool, leaveSize int32) (net.PacketConn, error) {
+	var header []byte
+	header = binary.BigEndian.AppendUint16(header, 0x0000) // Transaction ID
+	header = binary.BigEndian.AppendUint16(header, 0x0100) // Flags: Standard query
+	header = binary.BigEndian.AppendUint16(header, 0x0001) // Questions
+	header = binary.BigEndian.AppendUint16(header, 0x0000) // Answer RRs
+	header = binary.BigEndian.AppendUint16(header, 0x0000) // Authority RRs
+	header = binary.BigEndian.AppendUint16(header, 0x0000) // Additional RRs
+	buf := make([]byte, 0x100)
+	off1, err := packDomainName(c.Domain+".", buf)
+	if err != nil {
+		return nil, err
+	}
+	header = append(header, buf[:off1]...)
+	header = binary.BigEndian.AppendUint16(header, 0x0001) // Type: A
+	header = binary.BigEndian.AppendUint16(header, 0x0001) // Class: IN
+
+	conn := &dnsConn{
+		first:     first,
+		leaveSize: leaveSize,
+
+		conn: raw,
+		header: &dns{
+			header: header,
+		},
+	}
+
+	if first {
+		conn.readBuf = make([]byte, 8192)
+		conn.writeBuf = make([]byte, 8192)
+	}
+
+	return conn, nil
+}
+
+func NewConnServer(c *Config, raw net.PacketConn, first bool, leaveSize int32) (net.PacketConn, error) {
+	return NewConnClient(c, raw, first, leaveSize)
+}
+
+func (c *dnsConn) Size() int32 {
+	return c.header.Size()
+}
+
+func (c *dnsConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
+	if c.first {
+		c.readMutex.Lock()
+
+		n, addr, err = c.conn.ReadFrom(c.readBuf)
+		if err != nil {
+			c.readMutex.Unlock()
+			return n, addr, err
+		}
+
+		if n < int(c.Size()) {
+			c.readMutex.Unlock()
+			return 0, addr, errors.New("header").Base(io.ErrShortBuffer)
+		}
+
+		if len(p) < n-int(c.Size()) {
+			c.readMutex.Unlock()
+			return 0, addr, errors.New("header").Base(io.ErrShortBuffer)
+		}
+
+		copy(p, c.readBuf[c.Size():n])
+
+		c.readMutex.Unlock()
+		return n - int(c.Size()), addr, err
+	}
+
+	n, addr, err = c.conn.ReadFrom(p)
+	if err != nil {
+		return n, addr, err
+	}
+
+	if n < int(c.Size()) {
+		return 0, addr, errors.New("header").Base(io.ErrShortBuffer)
+	}
+
+	copy(p, p[c.Size():n])
+
+	return n - int(c.Size()), addr, err
+}
+
+func (c *dnsConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
+	if c.first {
+		if c.leaveSize+c.Size()+int32(len(p)) > 8192 {
+			return 0, errors.New("too many masks")
+		}
+
+		c.writeMutex.Lock()
+
+		n = copy(c.writeBuf[c.leaveSize+c.Size():], p)
+		n += int(c.leaveSize) + int(c.Size())
+
+		c.header.Serialize(c.writeBuf[c.leaveSize : c.leaveSize+c.Size()])
+
+		nn, err := c.conn.WriteTo(c.writeBuf[:n], addr)
+
+		if err != nil {
+			c.writeMutex.Unlock()
+			return 0, err
+		}
+
+		if nn != n {
+			c.writeMutex.Unlock()
+			return 0, errors.New("nn != n")
+		}
+
+		c.writeMutex.Unlock()
+		return len(p), nil
+	}
+
+	c.header.Serialize(p[c.leaveSize : c.leaveSize+c.Size()])
+
+	return c.conn.WriteTo(p, addr)
+}
+
+func (c *dnsConn) Close() error {
+	return c.conn.Close()
+}
+
+func (c *dnsConn) LocalAddr() net.Addr {
+	return c.conn.LocalAddr()
+}
+
+func (c *dnsConn) SetDeadline(t time.Time) error {
+	return c.conn.SetDeadline(t)
+}
+
+func (c *dnsConn) SetReadDeadline(t time.Time) error {
+	return c.conn.SetReadDeadline(t)
+}
+
+func (c *dnsConn) SetWriteDeadline(t time.Time) error {
+	return c.conn.SetWriteDeadline(t)
+}

transport/internet/finalmask/header/dtls/config.go

@@ -0,0 +1,16 @@
+package dtls
+
+import (
+	"net"
+)
+
+func (c *Config) UDP() {
+}
+
+func (c *Config) WrapPacketConnClient(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error) {
+	return NewConnClient(c, raw, first, leaveSize)
+}
+
+func (c *Config) WrapPacketConnServer(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error) {
+	return NewConnServer(c, raw, first, leaveSize)
+}

transport/internet/finalmask/header/dtls/config.pb.go

@@ -0,0 +1,114 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.36.10
+// 	protoc        v6.33.1
+// source: transport/internet/finalmask/header/dtls/config.proto
+
+package dtls
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+	unsafe "unsafe"
+)
+
+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 Config struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *Config) Reset() {
+	*x = Config{}
+	mi := &file_transport_internet_finalmask_header_dtls_config_proto_msgTypes[0]
+	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_transport_internet_finalmask_header_dtls_config_proto_msgTypes[0]
+	if 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_transport_internet_finalmask_header_dtls_config_proto_rawDescGZIP(), []int{0}
+}
+
+var File_transport_internet_finalmask_header_dtls_config_proto protoreflect.FileDescriptor
+
+const file_transport_internet_finalmask_header_dtls_config_proto_rawDesc = "" +
+	"\n" +
+	"5transport/internet/finalmask/header/dtls/config.proto\x12-xray.transport.internet.finalmask.header.dtls\"\b\n" +
+	"\x06ConfigB\xa9\x01\n" +
+	"1com.xray.transport.internet.finalmask.header.dtlsP\x01ZBgithub.com/xtls/xray-core/transport/internet/finalmask/header/dtls\xaa\x02-Xray.Transport.Internet.Finalmask.Header.Dtlsb\x06proto3"
+
+var (
+	file_transport_internet_finalmask_header_dtls_config_proto_rawDescOnce sync.Once
+	file_transport_internet_finalmask_header_dtls_config_proto_rawDescData []byte
+)
+
+func file_transport_internet_finalmask_header_dtls_config_proto_rawDescGZIP() []byte {
+	file_transport_internet_finalmask_header_dtls_config_proto_rawDescOnce.Do(func() {
+		file_transport_internet_finalmask_header_dtls_config_proto_rawDescData = protoimpl.X.CompressGZIP(unsafe.Slice(unsafe.StringData(file_transport_internet_finalmask_header_dtls_config_proto_rawDesc), len(file_transport_internet_finalmask_header_dtls_config_proto_rawDesc)))
+	})
+	return file_transport_internet_finalmask_header_dtls_config_proto_rawDescData
+}
+
+var file_transport_internet_finalmask_header_dtls_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_transport_internet_finalmask_header_dtls_config_proto_goTypes = []any{
+	(*Config)(nil), // 0: xray.transport.internet.finalmask.header.dtls.Config
+}
+var file_transport_internet_finalmask_header_dtls_config_proto_depIdxs = []int32{
+	0, // [0:0] is the sub-list for method output_type
+	0, // [0:0] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_transport_internet_finalmask_header_dtls_config_proto_init() }
+func file_transport_internet_finalmask_header_dtls_config_proto_init() {
+	if File_transport_internet_finalmask_header_dtls_config_proto != nil {
+		return
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: unsafe.Slice(unsafe.StringData(file_transport_internet_finalmask_header_dtls_config_proto_rawDesc), len(file_transport_internet_finalmask_header_dtls_config_proto_rawDesc)),
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_transport_internet_finalmask_header_dtls_config_proto_goTypes,
+		DependencyIndexes: file_transport_internet_finalmask_header_dtls_config_proto_depIdxs,
+		MessageInfos:      file_transport_internet_finalmask_header_dtls_config_proto_msgTypes,
+	}.Build()
+	File_transport_internet_finalmask_header_dtls_config_proto = out.File
+	file_transport_internet_finalmask_header_dtls_config_proto_goTypes = nil
+	file_transport_internet_finalmask_header_dtls_config_proto_depIdxs = nil
+}

transport/internet/finalmask/header/dtls/config.proto

@@ -0,0 +1,9 @@
+syntax = "proto3";
+
+package xray.transport.internet.finalmask.header.dtls;
+option csharp_namespace = "Xray.Transport.Internet.Finalmask.Header.Dtls";
+option go_package = "github.com/xtls/xray-core/transport/internet/finalmask/header/dtls";
+option java_package = "com.xray.transport.internet.finalmask.header.dtls";
+option java_multiple_files = true;
+
+message Config {}

transport/internet/finalmask/header/dtls/conn.go

@@ -0,0 +1,178 @@
+package dtls
+
+import (
+	"io"
+	"net"
+	sync "sync"
+	"time"
+
+	"github.com/xtls/xray-core/common/dice"
+	"github.com/xtls/xray-core/common/errors"
+)
+
+type dtls struct {
+	epoch    uint16
+	length   uint16
+	sequence uint32
+}
+
+func (*dtls) Size() int32 {
+	return 1 + 2 + 2 + 6 + 2
+}
+
+func (h *dtls) Serialize(b []byte) {
+	b[0] = 23
+	b[1] = 254
+	b[2] = 253
+	b[3] = byte(h.epoch >> 8)
+	b[4] = byte(h.epoch)
+	b[5] = 0
+	b[6] = 0
+	b[7] = byte(h.sequence >> 24)
+	b[8] = byte(h.sequence >> 16)
+	b[9] = byte(h.sequence >> 8)
+	b[10] = byte(h.sequence)
+	h.sequence++
+	b[11] = byte(h.length >> 8)
+	b[12] = byte(h.length)
+	h.length += 17
+	if h.length > 100 {
+		h.length -= 50
+	}
+}
+
+type dtlsConn struct {
+	first     bool
+	leaveSize int32
+
+	conn   net.PacketConn
+	header *dtls
+
+	readBuf    []byte
+	readMutex  sync.Mutex
+	writeBuf   []byte
+	writeMutex sync.Mutex
+}
+
+func NewConnClient(c *Config, raw net.PacketConn, first bool, leaveSize int32) (net.PacketConn, error) {
+	conn := &dtlsConn{
+		first:     first,
+		leaveSize: leaveSize,
+
+		conn: raw,
+		header: &dtls{
+			epoch:    dice.RollUint16(),
+			sequence: 0,
+			length:   17,
+		},
+	}
+
+	if first {
+		conn.readBuf = make([]byte, 8192)
+		conn.writeBuf = make([]byte, 8192)
+	}
+
+	return conn, nil
+}
+
+func NewConnServer(c *Config, raw net.PacketConn, first bool, leaveSize int32) (net.PacketConn, error) {
+	return NewConnClient(c, raw, first, leaveSize)
+}
+
+func (c *dtlsConn) Size() int32 {
+	return c.header.Size()
+}
+
+func (c *dtlsConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
+	if c.first {
+		c.readMutex.Lock()
+
+		n, addr, err = c.conn.ReadFrom(c.readBuf)
+		if err != nil {
+			c.readMutex.Unlock()
+			return n, addr, err
+		}
+
+		if n < int(c.Size()) {
+			c.readMutex.Unlock()
+			return 0, addr, errors.New("header").Base(io.ErrShortBuffer)
+		}
+
+		if len(p) < n-int(c.Size()) {
+			c.readMutex.Unlock()
+			return 0, addr, errors.New("header").Base(io.ErrShortBuffer)
+		}
+
+		copy(p, c.readBuf[c.Size():n])
+
+		c.readMutex.Unlock()
+		return n - int(c.Size()), addr, err
+	}
+
+	n, addr, err = c.conn.ReadFrom(p)
+	if err != nil {
+		return n, addr, err
+	}
+
+	if n < int(c.Size()) {
+		return 0, addr, errors.New("header").Base(io.ErrShortBuffer)
+	}
+
+	copy(p, p[c.Size():n])
+
+	return n - int(c.Size()), addr, err
+}
+
+func (c *dtlsConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
+	if c.first {
+		if c.leaveSize+c.Size()+int32(len(p)) > 8192 {
+			return 0, errors.New("too many masks")
+		}
+
+		c.writeMutex.Lock()
+
+		n = copy(c.writeBuf[c.leaveSize+c.Size():], p)
+		n += int(c.leaveSize) + int(c.Size())
+
+		c.header.Serialize(c.writeBuf[c.leaveSize : c.leaveSize+c.Size()])
+
+		nn, err := c.conn.WriteTo(c.writeBuf[:n], addr)
+
+		if err != nil {
+			c.writeMutex.Unlock()
+			return 0, err
+		}
+
+		if nn != n {
+			c.writeMutex.Unlock()
+			return 0, errors.New("nn != n")
+		}
+
+		c.writeMutex.Unlock()
+		return len(p), nil
+	}
+
+	c.header.Serialize(p[c.leaveSize : c.leaveSize+c.Size()])
+
+	return c.conn.WriteTo(p, addr)
+}
+
+func (c *dtlsConn) Close() error {
+	return c.conn.Close()
+}
+
+func (c *dtlsConn) LocalAddr() net.Addr {
+	return c.conn.LocalAddr()
+}
+
+func (c *dtlsConn) SetDeadline(t time.Time) error {
+	return c.conn.SetDeadline(t)
+}
+
+func (c *dtlsConn) SetReadDeadline(t time.Time) error {
+	return c.conn.SetReadDeadline(t)
+}
+
+func (c *dtlsConn) SetWriteDeadline(t time.Time) error {
+	return c.conn.SetWriteDeadline(t)
+}

transport/internet/finalmask/header/srtp/config.go

@@ -0,0 +1,16 @@
+package srtp
+
+import (
+	"net"
+)
+
+func (c *Config) UDP() {
+}
+
+func (c *Config) WrapPacketConnClient(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error) {
+	return NewConnClient(c, raw, first, leaveSize)
+}
+
+func (c *Config) WrapPacketConnServer(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error) {
+	return NewConnServer(c, raw, first, leaveSize)
+}

transport/internet/finalmask/header/srtp/config.pb.go

@@ -0,0 +1,114 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.36.10
+// 	protoc        v6.33.1
+// source: transport/internet/finalmask/header/srtp/config.proto
+
+package srtp
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+	unsafe "unsafe"
+)
+
+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 Config struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *Config) Reset() {
+	*x = Config{}
+	mi := &file_transport_internet_finalmask_header_srtp_config_proto_msgTypes[0]
+	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_transport_internet_finalmask_header_srtp_config_proto_msgTypes[0]
+	if 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_transport_internet_finalmask_header_srtp_config_proto_rawDescGZIP(), []int{0}
+}
+
+var File_transport_internet_finalmask_header_srtp_config_proto protoreflect.FileDescriptor
+
+const file_transport_internet_finalmask_header_srtp_config_proto_rawDesc = "" +
+	"\n" +
+	"5transport/internet/finalmask/header/srtp/config.proto\x12-xray.transport.internet.finalmask.header.srtp\"\b\n" +
+	"\x06ConfigB\xa9\x01\n" +
+	"1com.xray.transport.internet.finalmask.header.srtpP\x01ZBgithub.com/xtls/xray-core/transport/internet/finalmask/header/srtp\xaa\x02-Xray.Transport.Internet.Finalmask.Header.Srtpb\x06proto3"
+
+var (
+	file_transport_internet_finalmask_header_srtp_config_proto_rawDescOnce sync.Once
+	file_transport_internet_finalmask_header_srtp_config_proto_rawDescData []byte
+)
+
+func file_transport_internet_finalmask_header_srtp_config_proto_rawDescGZIP() []byte {
+	file_transport_internet_finalmask_header_srtp_config_proto_rawDescOnce.Do(func() {
+		file_transport_internet_finalmask_header_srtp_config_proto_rawDescData = protoimpl.X.CompressGZIP(unsafe.Slice(unsafe.StringData(file_transport_internet_finalmask_header_srtp_config_proto_rawDesc), len(file_transport_internet_finalmask_header_srtp_config_proto_rawDesc)))
+	})
+	return file_transport_internet_finalmask_header_srtp_config_proto_rawDescData
+}
+
+var file_transport_internet_finalmask_header_srtp_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_transport_internet_finalmask_header_srtp_config_proto_goTypes = []any{
+	(*Config)(nil), // 0: xray.transport.internet.finalmask.header.srtp.Config
+}
+var file_transport_internet_finalmask_header_srtp_config_proto_depIdxs = []int32{
+	0, // [0:0] is the sub-list for method output_type
+	0, // [0:0] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_transport_internet_finalmask_header_srtp_config_proto_init() }
+func file_transport_internet_finalmask_header_srtp_config_proto_init() {
+	if File_transport_internet_finalmask_header_srtp_config_proto != nil {
+		return
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: unsafe.Slice(unsafe.StringData(file_transport_internet_finalmask_header_srtp_config_proto_rawDesc), len(file_transport_internet_finalmask_header_srtp_config_proto_rawDesc)),
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_transport_internet_finalmask_header_srtp_config_proto_goTypes,
+		DependencyIndexes: file_transport_internet_finalmask_header_srtp_config_proto_depIdxs,
+		MessageInfos:      file_transport_internet_finalmask_header_srtp_config_proto_msgTypes,
+	}.Build()
+	File_transport_internet_finalmask_header_srtp_config_proto = out.File
+	file_transport_internet_finalmask_header_srtp_config_proto_goTypes = nil
+	file_transport_internet_finalmask_header_srtp_config_proto_depIdxs = nil
+}

transport/internet/finalmask/header/srtp/config.proto

@@ -0,0 +1,9 @@
+syntax = "proto3";
+
+package xray.transport.internet.finalmask.header.srtp;
+option csharp_namespace = "Xray.Transport.Internet.Finalmask.Header.Srtp";
+option go_package = "github.com/xtls/xray-core/transport/internet/finalmask/header/srtp";
+option java_package = "com.xray.transport.internet.finalmask.header.srtp";
+option java_multiple_files = true;
+
+message Config {}

transport/internet/finalmask/header/srtp/conn.go

@@ -0,0 +1,162 @@
+package srtp
+
+import (
+	"encoding/binary"
+	"io"
+	"net"
+	sync "sync"
+	"time"
+
+	"github.com/xtls/xray-core/common/dice"
+	"github.com/xtls/xray-core/common/errors"
+)
+
+type srtp struct {
+	header uint16
+	number uint16
+}
+
+func (*srtp) Size() int32 {
+	return 4
+}
+
+func (h *srtp) Serialize(b []byte) {
+	h.number++
+	binary.BigEndian.PutUint16(b, h.header)
+	binary.BigEndian.PutUint16(b[2:], h.number)
+}
+
+type srtpConn struct {
+	first     bool
+	leaveSize int32
+
+	conn   net.PacketConn
+	header *srtp
+
+	readBuf    []byte
+	readMutex  sync.Mutex
+	writeBuf   []byte
+	writeMutex sync.Mutex
+}
+
+func NewConnClient(c *Config, raw net.PacketConn, first bool, leaveSize int32) (net.PacketConn, error) {
+	conn := &srtpConn{
+		first:     first,
+		leaveSize: leaveSize,
+
+		conn: raw,
+		header: &srtp{
+			header: 0xB5E8,
+			number: dice.RollUint16(),
+		},
+	}
+
+	if first {
+		conn.readBuf = make([]byte, 8192)
+		conn.writeBuf = make([]byte, 8192)
+	}
+
+	return conn, nil
+}
+
+func NewConnServer(c *Config, raw net.PacketConn, first bool, leaveSize int32) (net.PacketConn, error) {
+	return NewConnClient(c, raw, first, leaveSize)
+}
+
+func (c *srtpConn) Size() int32 {
+	return c.header.Size()
+}
+
+func (c *srtpConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
+	if c.first {
+		c.readMutex.Lock()
+
+		n, addr, err = c.conn.ReadFrom(c.readBuf)
+		if err != nil {
+			c.readMutex.Unlock()
+			return n, addr, err
+		}
+
+		if n < int(c.Size()) {
+			c.readMutex.Unlock()
+			return 0, addr, errors.New("header").Base(io.ErrShortBuffer)
+		}
+
+		if len(p) < n-int(c.Size()) {
+			c.readMutex.Unlock()
+			return 0, addr, errors.New("header").Base(io.ErrShortBuffer)
+		}
+
+		copy(p, c.readBuf[c.Size():n])
+
+		c.readMutex.Unlock()
+		return n - int(c.Size()), addr, err
+	}
+
+	n, addr, err = c.conn.ReadFrom(p)
+	if err != nil {
+		return n, addr, err
+	}
+
+	if n < int(c.Size()) {
+		return 0, addr, errors.New("header").Base(io.ErrShortBuffer)
+	}
+
+	copy(p, p[c.Size():n])
+
+	return n - int(c.Size()), addr, err
+}
+
+func (c *srtpConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
+	if c.first {
+		if c.leaveSize+c.Size()+int32(len(p)) > 8192 {
+			return 0, errors.New("too many masks")
+		}
+
+		c.writeMutex.Lock()
+
+		n = copy(c.writeBuf[c.leaveSize+c.Size():], p)
+		n += int(c.leaveSize) + int(c.Size())
+
+		c.header.Serialize(c.writeBuf[c.leaveSize : c.leaveSize+c.Size()])
+
+		nn, err := c.conn.WriteTo(c.writeBuf[:n], addr)
+
+		if err != nil {
+			c.writeMutex.Unlock()
+			return 0, err
+		}
+
+		if nn != n {
+			c.writeMutex.Unlock()
+			return 0, errors.New("nn != n")
+		}
+
+		c.writeMutex.Unlock()
+		return len(p), nil
+	}
+
+	c.header.Serialize(p[c.leaveSize : c.leaveSize+c.Size()])
+
+	return c.conn.WriteTo(p, addr)
+}
+
+func (c *srtpConn) Close() error {
+	return c.conn.Close()
+}
+
+func (c *srtpConn) LocalAddr() net.Addr {
+	return c.conn.LocalAddr()
+}
+
+func (c *srtpConn) SetDeadline(t time.Time) error {
+	return c.conn.SetDeadline(t)
+}
+
+func (c *srtpConn) SetReadDeadline(t time.Time) error {
+	return c.conn.SetReadDeadline(t)
+}
+
+func (c *srtpConn) SetWriteDeadline(t time.Time) error {
+	return c.conn.SetWriteDeadline(t)
+}

transport/internet/finalmask/header/utp/config.go

@@ -0,0 +1,16 @@
+package utp
+
+import (
+	"net"
+)
+
+func (c *Config) UDP() {
+}
+
+func (c *Config) WrapPacketConnClient(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error) {
+	return NewConnClient(c, raw, first, leaveSize)
+}
+
+func (c *Config) WrapPacketConnServer(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error) {
+	return NewConnServer(c, raw, first, leaveSize)
+}

transport/internet/finalmask/header/utp/config.pb.go

@@ -0,0 +1,114 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.36.10
+// 	protoc        v6.33.1
+// source: transport/internet/finalmask/header/utp/config.proto
+
+package utp
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+	unsafe "unsafe"
+)
+
+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 Config struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *Config) Reset() {
+	*x = Config{}
+	mi := &file_transport_internet_finalmask_header_utp_config_proto_msgTypes[0]
+	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_transport_internet_finalmask_header_utp_config_proto_msgTypes[0]
+	if 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_transport_internet_finalmask_header_utp_config_proto_rawDescGZIP(), []int{0}
+}
+
+var File_transport_internet_finalmask_header_utp_config_proto protoreflect.FileDescriptor
+
+const file_transport_internet_finalmask_header_utp_config_proto_rawDesc = "" +
+	"\n" +
+	"4transport/internet/finalmask/header/utp/config.proto\x12,xray.transport.internet.finalmask.header.utp\"\b\n" +
+	"\x06ConfigB\xa6\x01\n" +
+	"0com.xray.transport.internet.finalmask.header.utpP\x01ZAgithub.com/xtls/xray-core/transport/internet/finalmask/header/utp\xaa\x02,Xray.Transport.Internet.Finalmask.Header.Utpb\x06proto3"
+
+var (
+	file_transport_internet_finalmask_header_utp_config_proto_rawDescOnce sync.Once
+	file_transport_internet_finalmask_header_utp_config_proto_rawDescData []byte
+)
+
+func file_transport_internet_finalmask_header_utp_config_proto_rawDescGZIP() []byte {
+	file_transport_internet_finalmask_header_utp_config_proto_rawDescOnce.Do(func() {
+		file_transport_internet_finalmask_header_utp_config_proto_rawDescData = protoimpl.X.CompressGZIP(unsafe.Slice(unsafe.StringData(file_transport_internet_finalmask_header_utp_config_proto_rawDesc), len(file_transport_internet_finalmask_header_utp_config_proto_rawDesc)))
+	})
+	return file_transport_internet_finalmask_header_utp_config_proto_rawDescData
+}
+
+var file_transport_internet_finalmask_header_utp_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_transport_internet_finalmask_header_utp_config_proto_goTypes = []any{
+	(*Config)(nil), // 0: xray.transport.internet.finalmask.header.utp.Config
+}
+var file_transport_internet_finalmask_header_utp_config_proto_depIdxs = []int32{
+	0, // [0:0] is the sub-list for method output_type
+	0, // [0:0] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_transport_internet_finalmask_header_utp_config_proto_init() }
+func file_transport_internet_finalmask_header_utp_config_proto_init() {
+	if File_transport_internet_finalmask_header_utp_config_proto != nil {
+		return
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: unsafe.Slice(unsafe.StringData(file_transport_internet_finalmask_header_utp_config_proto_rawDesc), len(file_transport_internet_finalmask_header_utp_config_proto_rawDesc)),
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_transport_internet_finalmask_header_utp_config_proto_goTypes,
+		DependencyIndexes: file_transport_internet_finalmask_header_utp_config_proto_depIdxs,
+		MessageInfos:      file_transport_internet_finalmask_header_utp_config_proto_msgTypes,
+	}.Build()
+	File_transport_internet_finalmask_header_utp_config_proto = out.File
+	file_transport_internet_finalmask_header_utp_config_proto_goTypes = nil
+	file_transport_internet_finalmask_header_utp_config_proto_depIdxs = nil
+}

transport/internet/finalmask/header/utp/config.proto

@@ -0,0 +1,9 @@
+syntax = "proto3";
+
+package xray.transport.internet.finalmask.header.utp;
+option csharp_namespace = "Xray.Transport.Internet.Finalmask.Header.Utp";
+option go_package = "github.com/xtls/xray-core/transport/internet/finalmask/header/utp";
+option java_package = "com.xray.transport.internet.finalmask.header.utp";
+option java_multiple_files = true;
+
+message Config {}

transport/internet/finalmask/header/utp/conn.go

@@ -0,0 +1,164 @@
+package utp
+
+import (
+	"encoding/binary"
+	"io"
+	"net"
+	sync "sync"
+	"time"
+
+	"github.com/xtls/xray-core/common/dice"
+	"github.com/xtls/xray-core/common/errors"
+)
+
+type utp struct {
+	header       byte
+	extension    byte
+	connectionID uint16
+}
+
+func (*utp) Size() int32 {
+	return 4
+}
+
+func (h *utp) Serialize(b []byte) {
+	binary.BigEndian.PutUint16(b, h.connectionID)
+	b[2] = h.header
+	b[3] = h.extension
+}
+
+type utpConn struct {
+	first     bool
+	leaveSize int32
+
+	conn   net.PacketConn
+	header *utp
+
+	readBuf    []byte
+	readMutex  sync.Mutex
+	writeBuf   []byte
+	writeMutex sync.Mutex
+}
+
+func NewConnClient(c *Config, raw net.PacketConn, first bool, leaveSize int32) (net.PacketConn, error) {
+	conn := &utpConn{
+		first:     first,
+		leaveSize: leaveSize,
+
+		conn: raw,
+		header: &utp{
+			header:       1,
+			extension:    0,
+			connectionID: dice.RollUint16(),
+		},
+	}
+
+	if first {
+		conn.readBuf = make([]byte, 8192)
+		conn.writeBuf = make([]byte, 8192)
+	}
+
+	return conn, nil
+}
+
+func NewConnServer(c *Config, raw net.PacketConn, first bool, leaveSize int32) (net.PacketConn, error) {
+	return NewConnClient(c, raw, first, leaveSize)
+}
+
+func (c *utpConn) Size() int32 {
+	return c.header.Size()
+}
+
+func (c *utpConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
+	if c.first {
+		c.readMutex.Lock()
+
+		n, addr, err = c.conn.ReadFrom(c.readBuf)
+		if err != nil {
+			c.readMutex.Unlock()
+			return n, addr, err
+		}
+
+		if n < int(c.Size()) {
+			c.readMutex.Unlock()
+			return 0, addr, errors.New("header").Base(io.ErrShortBuffer)
+		}
+
+		if len(p) < n-int(c.Size()) {
+			c.readMutex.Unlock()
+			return 0, addr, errors.New("header").Base(io.ErrShortBuffer)
+		}
+
+		copy(p, c.readBuf[c.Size():n])
+
+		c.readMutex.Unlock()
+		return n - int(c.Size()), addr, err
+	}
+
+	n, addr, err = c.conn.ReadFrom(p)
+	if err != nil {
+		return n, addr, err
+	}
+
+	if n < int(c.Size()) {
+		return 0, addr, errors.New("header").Base(io.ErrShortBuffer)
+	}
+
+	copy(p, p[c.Size():n])
+
+	return n - int(c.Size()), addr, err
+}
+
+func (c *utpConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
+	if c.first {
+		if c.leaveSize+c.Size()+int32(len(p)) > 8192 {
+			return 0, errors.New("too many masks")
+		}
+
+		c.writeMutex.Lock()
+
+		n = copy(c.writeBuf[c.leaveSize+c.Size():], p)
+		n += int(c.leaveSize) + int(c.Size())
+
+		c.header.Serialize(c.writeBuf[c.leaveSize : c.leaveSize+c.Size()])
+
+		nn, err := c.conn.WriteTo(c.writeBuf[:n], addr)
+
+		if err != nil {
+			c.writeMutex.Unlock()
+			return 0, err
+		}
+
+		if nn != n {
+			c.writeMutex.Unlock()
+			return 0, errors.New("nn != n")
+		}
+
+		c.writeMutex.Unlock()
+		return len(p), nil
+	}
+
+	c.header.Serialize(p[c.leaveSize : c.leaveSize+c.Size()])
+
+	return c.conn.WriteTo(p, addr)
+}
+
+func (c *utpConn) Close() error {
+	return c.conn.Close()
+}
+
+func (c *utpConn) LocalAddr() net.Addr {
+	return c.conn.LocalAddr()
+}
+
+func (c *utpConn) SetDeadline(t time.Time) error {
+	return c.conn.SetDeadline(t)
+}
+
+func (c *utpConn) SetReadDeadline(t time.Time) error {
+	return c.conn.SetReadDeadline(t)
+}
+
+func (c *utpConn) SetWriteDeadline(t time.Time) error {
+	return c.conn.SetWriteDeadline(t)
+}

transport/internet/finalmask/header/wechat/config.go

@@ -0,0 +1,16 @@
+package wechat
+
+import (
+	"net"
+)
+
+func (c *Config) UDP() {
+}
+
+func (c *Config) WrapPacketConnClient(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error) {
+	return NewConnClient(c, raw, first, leaveSize)
+}
+
+func (c *Config) WrapPacketConnServer(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error) {
+	return NewConnServer(c, raw, first, leaveSize)
+}

transport/internet/finalmask/header/wechat/config.pb.go

@@ -0,0 +1,114 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.36.10
+// 	protoc        v6.33.1
+// source: transport/internet/finalmask/header/wechat/config.proto
+
+package wechat
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+	unsafe "unsafe"
+)
+
+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 Config struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *Config) Reset() {
+	*x = Config{}
+	mi := &file_transport_internet_finalmask_header_wechat_config_proto_msgTypes[0]
+	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_transport_internet_finalmask_header_wechat_config_proto_msgTypes[0]
+	if 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_transport_internet_finalmask_header_wechat_config_proto_rawDescGZIP(), []int{0}
+}
+
+var File_transport_internet_finalmask_header_wechat_config_proto protoreflect.FileDescriptor
+
+const file_transport_internet_finalmask_header_wechat_config_proto_rawDesc = "" +
+	"\n" +
+	"7transport/internet/finalmask/header/wechat/config.proto\x12/xray.transport.internet.finalmask.header.wechat\"\b\n" +
+	"\x06ConfigB\xaf\x01\n" +
+	"3com.xray.transport.internet.finalmask.header.wechatP\x01ZDgithub.com/xtls/xray-core/transport/internet/finalmask/header/wechat\xaa\x02/Xray.Transport.Internet.Finalmask.Header.Wechatb\x06proto3"
+
+var (
+	file_transport_internet_finalmask_header_wechat_config_proto_rawDescOnce sync.Once
+	file_transport_internet_finalmask_header_wechat_config_proto_rawDescData []byte
+)
+
+func file_transport_internet_finalmask_header_wechat_config_proto_rawDescGZIP() []byte {
+	file_transport_internet_finalmask_header_wechat_config_proto_rawDescOnce.Do(func() {
+		file_transport_internet_finalmask_header_wechat_config_proto_rawDescData = protoimpl.X.CompressGZIP(unsafe.Slice(unsafe.StringData(file_transport_internet_finalmask_header_wechat_config_proto_rawDesc), len(file_transport_internet_finalmask_header_wechat_config_proto_rawDesc)))
+	})
+	return file_transport_internet_finalmask_header_wechat_config_proto_rawDescData
+}
+
+var file_transport_internet_finalmask_header_wechat_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_transport_internet_finalmask_header_wechat_config_proto_goTypes = []any{
+	(*Config)(nil), // 0: xray.transport.internet.finalmask.header.wechat.Config
+}
+var file_transport_internet_finalmask_header_wechat_config_proto_depIdxs = []int32{
+	0, // [0:0] is the sub-list for method output_type
+	0, // [0:0] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_transport_internet_finalmask_header_wechat_config_proto_init() }
+func file_transport_internet_finalmask_header_wechat_config_proto_init() {
+	if File_transport_internet_finalmask_header_wechat_config_proto != nil {
+		return
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: unsafe.Slice(unsafe.StringData(file_transport_internet_finalmask_header_wechat_config_proto_rawDesc), len(file_transport_internet_finalmask_header_wechat_config_proto_rawDesc)),
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_transport_internet_finalmask_header_wechat_config_proto_goTypes,
+		DependencyIndexes: file_transport_internet_finalmask_header_wechat_config_proto_depIdxs,
+		MessageInfos:      file_transport_internet_finalmask_header_wechat_config_proto_msgTypes,
+	}.Build()
+	File_transport_internet_finalmask_header_wechat_config_proto = out.File
+	file_transport_internet_finalmask_header_wechat_config_proto_goTypes = nil
+	file_transport_internet_finalmask_header_wechat_config_proto_depIdxs = nil
+}

transport/internet/finalmask/header/wechat/config.proto

@@ -0,0 +1,9 @@
+syntax = "proto3";
+
+package xray.transport.internet.finalmask.header.wechat;
+option csharp_namespace = "Xray.Transport.Internet.Finalmask.Header.Wechat";
+option go_package = "github.com/xtls/xray-core/transport/internet/finalmask/header/wechat";
+option java_package = "com.xray.transport.internet.finalmask.header.wechat";
+option java_multiple_files = true;
+
+message Config {}

transport/internet/finalmask/header/wechat/conn.go

@@ -0,0 +1,168 @@
+package wechat
+
+import (
+	"encoding/binary"
+	"io"
+	"net"
+	sync "sync"
+	"time"
+
+	"github.com/xtls/xray-core/common/dice"
+	"github.com/xtls/xray-core/common/errors"
+)
+
+type wechat struct {
+	sn uint32
+}
+
+func (*wechat) Size() int32 {
+	return 13
+}
+
+func (h *wechat) Serialize(b []byte) {
+	h.sn++
+	b[0] = 0xa1
+	b[1] = 0x08
+	binary.BigEndian.PutUint32(b[2:], h.sn)
+	b[6] = 0x00
+	b[7] = 0x10
+	b[8] = 0x11
+	b[9] = 0x18
+	b[10] = 0x30
+	b[11] = 0x22
+	b[12] = 0x30
+}
+
+type wechatConn struct {
+	first     bool
+	leaveSize int32
+
+	conn   net.PacketConn
+	header *wechat
+
+	readBuf    []byte
+	readMutex  sync.Mutex
+	writeBuf   []byte
+	writeMutex sync.Mutex
+}
+
+func NewConnClient(c *Config, raw net.PacketConn, first bool, leaveSize int32) (net.PacketConn, error) {
+	conn := &wechatConn{
+		first:     first,
+		leaveSize: leaveSize,
+
+		conn: raw,
+		header: &wechat{
+			sn: uint32(dice.RollUint16()),
+		},
+	}
+
+	if first {
+		conn.readBuf = make([]byte, 8192)
+		conn.writeBuf = make([]byte, 8192)
+	}
+
+	return conn, nil
+}
+
+func NewConnServer(c *Config, raw net.PacketConn, first bool, leaveSize int32) (net.PacketConn, error) {
+	return NewConnClient(c, raw, first, leaveSize)
+}
+
+func (c *wechatConn) Size() int32 {
+	return c.header.Size()
+}
+
+func (c *wechatConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
+	if c.first {
+		c.readMutex.Lock()
+
+		n, addr, err = c.conn.ReadFrom(c.readBuf)
+		if err != nil {
+			c.readMutex.Unlock()
+			return n, addr, err
+		}
+
+		if n < int(c.Size()) {
+			c.readMutex.Unlock()
+			return 0, addr, errors.New("header").Base(io.ErrShortBuffer)
+		}
+
+		if len(p) < n-int(c.Size()) {
+			c.readMutex.Unlock()
+			return 0, addr, errors.New("header").Base(io.ErrShortBuffer)
+		}
+
+		copy(p, c.readBuf[c.Size():n])
+
+		c.readMutex.Unlock()
+		return n - int(c.Size()), addr, err
+	}
+
+	n, addr, err = c.conn.ReadFrom(p)
+	if err != nil {
+		return n, addr, err
+	}
+
+	if n < int(c.Size()) {
+		return 0, addr, errors.New("header").Base(io.ErrShortBuffer)
+	}
+
+	copy(p, p[c.Size():n])
+
+	return n - int(c.Size()), addr, err
+}
+
+func (c *wechatConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
+	if c.first {
+		if c.leaveSize+c.Size()+int32(len(p)) > 8192 {
+			return 0, errors.New("too many masks")
+		}
+
+		c.writeMutex.Lock()
+
+		n = copy(c.writeBuf[c.leaveSize+c.Size():], p)
+		n += int(c.leaveSize) + int(c.Size())
+
+		c.header.Serialize(c.writeBuf[c.leaveSize : c.leaveSize+c.Size()])
+
+		nn, err := c.conn.WriteTo(c.writeBuf[:n], addr)
+
+		if err != nil {
+			c.writeMutex.Unlock()
+			return 0, err
+		}
+
+		if nn != n {
+			c.writeMutex.Unlock()
+			return 0, errors.New("nn != n")
+		}
+
+		c.writeMutex.Unlock()
+		return len(p), nil
+	}
+
+	c.header.Serialize(p[c.leaveSize : c.leaveSize+c.Size()])
+
+	return c.conn.WriteTo(p, addr)
+}
+
+func (c *wechatConn) Close() error {
+	return c.conn.Close()
+}
+
+func (c *wechatConn) LocalAddr() net.Addr {
+	return c.conn.LocalAddr()
+}
+
+func (c *wechatConn) SetDeadline(t time.Time) error {
+	return c.conn.SetDeadline(t)
+}
+
+func (c *wechatConn) SetReadDeadline(t time.Time) error {
+	return c.conn.SetReadDeadline(t)
+}
+
+func (c *wechatConn) SetWriteDeadline(t time.Time) error {
+	return c.conn.SetWriteDeadline(t)
+}

transport/internet/finalmask/header/wireguard/config.go

@@ -0,0 +1,16 @@
+package wireguard
+
+import (
+	"net"
+)
+
+func (c *Config) UDP() {
+}
+
+func (c *Config) WrapPacketConnClient(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error) {
+	return NewConnClient(c, raw, first, leaveSize)
+}
+
+func (c *Config) WrapPacketConnServer(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error) {
+	return NewConnServer(c, raw, first, leaveSize)
+}

transport/internet/finalmask/header/wireguard/config.pb.go

@@ -0,0 +1,114 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.36.10
+// 	protoc        v6.33.1
+// source: transport/internet/finalmask/header/wireguard/config.proto
+
+package wireguard
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+	unsafe "unsafe"
+)
+
+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 Config struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *Config) Reset() {
+	*x = Config{}
+	mi := &file_transport_internet_finalmask_header_wireguard_config_proto_msgTypes[0]
+	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_transport_internet_finalmask_header_wireguard_config_proto_msgTypes[0]
+	if 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_transport_internet_finalmask_header_wireguard_config_proto_rawDescGZIP(), []int{0}
+}
+
+var File_transport_internet_finalmask_header_wireguard_config_proto protoreflect.FileDescriptor
+
+const file_transport_internet_finalmask_header_wireguard_config_proto_rawDesc = "" +
+	"\n" +
+	":transport/internet/finalmask/header/wireguard/config.proto\x122xray.transport.internet.finalmask.header.wireguard\"\b\n" +
+	"\x06ConfigB\xb8\x01\n" +
+	"6com.xray.transport.internet.finalmask.header.wireguardP\x01ZGgithub.com/xtls/xray-core/transport/internet/finalmask/header/wireguard\xaa\x022Xray.Transport.Internet.Finalmask.Header.Wireguardb\x06proto3"
+
+var (
+	file_transport_internet_finalmask_header_wireguard_config_proto_rawDescOnce sync.Once
+	file_transport_internet_finalmask_header_wireguard_config_proto_rawDescData []byte
+)
+
+func file_transport_internet_finalmask_header_wireguard_config_proto_rawDescGZIP() []byte {
+	file_transport_internet_finalmask_header_wireguard_config_proto_rawDescOnce.Do(func() {
+		file_transport_internet_finalmask_header_wireguard_config_proto_rawDescData = protoimpl.X.CompressGZIP(unsafe.Slice(unsafe.StringData(file_transport_internet_finalmask_header_wireguard_config_proto_rawDesc), len(file_transport_internet_finalmask_header_wireguard_config_proto_rawDesc)))
+	})
+	return file_transport_internet_finalmask_header_wireguard_config_proto_rawDescData
+}
+
+var file_transport_internet_finalmask_header_wireguard_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_transport_internet_finalmask_header_wireguard_config_proto_goTypes = []any{
+	(*Config)(nil), // 0: xray.transport.internet.finalmask.header.wireguard.Config
+}
+var file_transport_internet_finalmask_header_wireguard_config_proto_depIdxs = []int32{
+	0, // [0:0] is the sub-list for method output_type
+	0, // [0:0] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_transport_internet_finalmask_header_wireguard_config_proto_init() }
+func file_transport_internet_finalmask_header_wireguard_config_proto_init() {
+	if File_transport_internet_finalmask_header_wireguard_config_proto != nil {
+		return
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: unsafe.Slice(unsafe.StringData(file_transport_internet_finalmask_header_wireguard_config_proto_rawDesc), len(file_transport_internet_finalmask_header_wireguard_config_proto_rawDesc)),
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_transport_internet_finalmask_header_wireguard_config_proto_goTypes,
+		DependencyIndexes: file_transport_internet_finalmask_header_wireguard_config_proto_depIdxs,
+		MessageInfos:      file_transport_internet_finalmask_header_wireguard_config_proto_msgTypes,
+	}.Build()
+	File_transport_internet_finalmask_header_wireguard_config_proto = out.File
+	file_transport_internet_finalmask_header_wireguard_config_proto_goTypes = nil
+	file_transport_internet_finalmask_header_wireguard_config_proto_depIdxs = nil
+}

transport/internet/finalmask/header/wireguard/config.proto

@@ -0,0 +1,9 @@
+syntax = "proto3";
+
+package xray.transport.internet.finalmask.header.wireguard;
+option csharp_namespace = "Xray.Transport.Internet.Finalmask.Header.Wireguard";
+option go_package = "github.com/xtls/xray-core/transport/internet/finalmask/header/wireguard";
+option java_package = "com.xray.transport.internet.finalmask.header.wireguard";
+option java_multiple_files = true;
+
+message Config {}

transport/internet/finalmask/header/wireguard/conn.go

@@ -0,0 +1,155 @@
+package wireguard
+
+import (
+	"io"
+	"net"
+	sync "sync"
+	"time"
+
+	"github.com/xtls/xray-core/common/errors"
+)
+
+type wireguare struct{}
+
+func (*wireguare) Size() int32 {
+	return 4
+}
+
+func (h *wireguare) Serialize(b []byte) {
+	b[0] = 0x04
+	b[1] = 0x00
+	b[2] = 0x00
+	b[3] = 0x00
+}
+
+type wireguareConn struct {
+	first     bool
+	leaveSize int32
+
+	conn   net.PacketConn
+	header *wireguare
+
+	readBuf    []byte
+	readMutex  sync.Mutex
+	writeBuf   []byte
+	writeMutex sync.Mutex
+}
+
+func NewConnClient(c *Config, raw net.PacketConn, first bool, leaveSize int32) (net.PacketConn, error) {
+	conn := &wireguareConn{
+		first:     first,
+		leaveSize: leaveSize,
+
+		conn:   raw,
+		header: &wireguare{},
+	}
+
+	if first {
+		conn.readBuf = make([]byte, 8192)
+		conn.writeBuf = make([]byte, 8192)
+	}
+
+	return conn, nil
+}
+
+func NewConnServer(c *Config, raw net.PacketConn, first bool, leaveSize int32) (net.PacketConn, error) {
+	return NewConnClient(c, raw, first, leaveSize)
+}
+
+func (c *wireguareConn) Size() int32 {
+	return c.header.Size()
+}
+
+func (c *wireguareConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
+	if c.first {
+		c.readMutex.Lock()
+
+		n, addr, err = c.conn.ReadFrom(c.readBuf)
+		if err != nil {
+			c.readMutex.Unlock()
+			return n, addr, err
+		}
+
+		if n < int(c.Size()) {
+			c.readMutex.Unlock()
+			return 0, addr, errors.New("header").Base(io.ErrShortBuffer)
+		}
+
+		if len(p) < n-int(c.Size()) {
+			c.readMutex.Unlock()
+			return 0, addr, errors.New("header").Base(io.ErrShortBuffer)
+		}
+
+		copy(p, c.readBuf[c.Size():n])
+
+		c.readMutex.Unlock()
+		return n - int(c.Size()), addr, err
+	}
+
+	n, addr, err = c.conn.ReadFrom(p)
+	if err != nil {
+		return n, addr, err
+	}
+
+	if n < int(c.Size()) {
+		return 0, addr, errors.New("header").Base(io.ErrShortBuffer)
+	}
+
+	copy(p, p[c.Size():n])
+
+	return n - int(c.Size()), addr, err
+}
+
+func (c *wireguareConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
+	if c.first {
+		if c.leaveSize+c.Size()+int32(len(p)) > 8192 {
+			return 0, errors.New("too many masks")
+		}
+
+		c.writeMutex.Lock()
+
+		n = copy(c.writeBuf[c.leaveSize+c.Size():], p)
+		n += int(c.leaveSize) + int(c.Size())
+
+		c.header.Serialize(c.writeBuf[c.leaveSize : c.leaveSize+c.Size()])
+
+		nn, err := c.conn.WriteTo(c.writeBuf[:n], addr)
+
+		if err != nil {
+			c.writeMutex.Unlock()
+			return 0, err
+		}
+
+		if nn != n {
+			c.writeMutex.Unlock()
+			return 0, errors.New("nn != n")
+		}
+
+		c.writeMutex.Unlock()
+		return len(p), nil
+	}
+
+	c.header.Serialize(p[c.leaveSize : c.leaveSize+c.Size()])
+
+	return c.conn.WriteTo(p, addr)
+}
+
+func (c *wireguareConn) Close() error {
+	return c.conn.Close()
+}
+
+func (c *wireguareConn) LocalAddr() net.Addr {
+	return c.conn.LocalAddr()
+}
+
+func (c *wireguareConn) SetDeadline(t time.Time) error {
+	return c.conn.SetDeadline(t)
+}
+
+func (c *wireguareConn) SetReadDeadline(t time.Time) error {
+	return c.conn.SetReadDeadline(t)
+}
+
+func (c *wireguareConn) SetWriteDeadline(t time.Time) error {
+	return c.conn.SetWriteDeadline(t)
+}

transport/internet/finalmask/mkcp/aes128gcm/aes128gcm_test.go

@@ -0,0 +1,70 @@
+package aes128gcm_test
+
+import (
+	"crypto/rand"
+	"crypto/sha256"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/xtls/xray-core/common/crypto"
+)
+
+func TestAes128GcmSealInPlace(t *testing.T) {
+	hashedPsk := sha256.Sum256([]byte("psk"))
+	aead := crypto.NewAesGcm(hashedPsk[:16])
+
+	text := []byte("0123456789012")
+	buf := make([]byte, 8192)
+
+	nonceSize := aead.NonceSize()
+	nonce := buf[:nonceSize]
+	rand.Read(nonce)
+	copy(buf[nonceSize:], text)
+	plaintext := buf[nonceSize : nonceSize+len(text)]
+
+	sealed := aead.Seal(nil, nonce, plaintext, nil)
+
+	_ = aead.Seal(plaintext[:0], nonce, plaintext, nil)
+
+	assert.Equal(t, sealed, buf[nonceSize:nonceSize+aead.Overhead()+len(text)])
+}
+
+func encrypted(plain []byte) ([]byte, []byte) {
+	hashedPsk := sha256.Sum256([]byte("psk"))
+	aead := crypto.NewAesGcm(hashedPsk[:16])
+
+	nonce := make([]byte, 12)
+	rand.Read(nonce)
+
+	return nonce, aead.Seal(nil, nonce, plain, nil)
+}
+
+func TestAes128GcmOpenInPlace(t *testing.T) {
+	a, b := encrypted([]byte("0123456789012"))
+	buf := make([]byte, 8192)
+	copy(buf, a)
+	copy(buf[len(a):], b)
+
+	hashedPsk := sha256.Sum256([]byte("psk"))
+	aead := crypto.NewAesGcm(hashedPsk[:16])
+
+	nonceSize := aead.NonceSize()
+	nonce := buf[:nonceSize]
+	ciphertext := buf[nonceSize : nonceSize+len(b)]
+
+	opened, _ := aead.Open(nil, nonce, ciphertext, nil)
+	_, _ = aead.Open(ciphertext[:0], nonce, ciphertext, nil)
+
+	assert.Equal(t, opened, ciphertext[:len(ciphertext)-aead.Overhead()])
+}
+
+func TestAes128GcmBounce(t *testing.T) {
+	hashedPsk := sha256.Sum256([]byte("psk"))
+	aead := crypto.NewAesGcm(hashedPsk[:16])
+	buf := make([]byte, aead.NonceSize()+aead.Overhead())
+	for i := 0; i < 1000; i++ {
+		_, _ = rand.Read(buf)
+		_, err := aead.Open(buf[aead.NonceSize():aead.NonceSize()], buf[:aead.NonceSize()], buf[aead.NonceSize():], nil)
+		assert.NotEqual(t, err, nil)
+	}
+}

transport/internet/finalmask/mkcp/aes128gcm/config.go

@@ -0,0 +1,16 @@
+package aes128gcm
+
+import (
+	"net"
+)
+
+func (c *Config) UDP() {
+}
+
+func (c *Config) WrapPacketConnClient(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error) {
+	return NewConnClient(c, raw, first, leaveSize)
+}
+
+func (c *Config) WrapPacketConnServer(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error) {
+	return NewConnServer(c, raw, first, leaveSize)
+}

transport/internet/finalmask/mkcp/aes128gcm/config.pb.go

@@ -0,0 +1,123 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.36.10
+// 	protoc        v6.33.1
+// source: transport/internet/finalmask/mkcp/aes128gcm/config.proto
+
+package aes128gcm
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+	unsafe "unsafe"
+)
+
+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 Config struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Password      string                 `protobuf:"bytes,1,opt,name=password,proto3" json:"password,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *Config) Reset() {
+	*x = Config{}
+	mi := &file_transport_internet_finalmask_mkcp_aes128gcm_config_proto_msgTypes[0]
+	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_transport_internet_finalmask_mkcp_aes128gcm_config_proto_msgTypes[0]
+	if 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_transport_internet_finalmask_mkcp_aes128gcm_config_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Config) GetPassword() string {
+	if x != nil {
+		return x.Password
+	}
+	return ""
+}
+
+var File_transport_internet_finalmask_mkcp_aes128gcm_config_proto protoreflect.FileDescriptor
+
+const file_transport_internet_finalmask_mkcp_aes128gcm_config_proto_rawDesc = "" +
+	"\n" +
+	"8transport/internet/finalmask/mkcp/aes128gcm/config.proto\x120xray.transport.internet.finalmask.mkcp.aes128gcm\"$\n" +
+	"\x06Config\x12\x1a\n" +
+	"\bpassword\x18\x01 \x01(\tR\bpasswordB\xb2\x01\n" +
+	"4com.xray.transport.internet.finalmask.mkcp.aes128gcmP\x01ZEgithub.com/xtls/xray-core/transport/internet/finalmask/mkcp/aes128gcm\xaa\x020Xray.Transport.Internet.Finalmask.Mkcp.Aes128Gcmb\x06proto3"
+
+var (
+	file_transport_internet_finalmask_mkcp_aes128gcm_config_proto_rawDescOnce sync.Once
+	file_transport_internet_finalmask_mkcp_aes128gcm_config_proto_rawDescData []byte
+)
+
+func file_transport_internet_finalmask_mkcp_aes128gcm_config_proto_rawDescGZIP() []byte {
+	file_transport_internet_finalmask_mkcp_aes128gcm_config_proto_rawDescOnce.Do(func() {
+		file_transport_internet_finalmask_mkcp_aes128gcm_config_proto_rawDescData = protoimpl.X.CompressGZIP(unsafe.Slice(unsafe.StringData(file_transport_internet_finalmask_mkcp_aes128gcm_config_proto_rawDesc), len(file_transport_internet_finalmask_mkcp_aes128gcm_config_proto_rawDesc)))
+	})
+	return file_transport_internet_finalmask_mkcp_aes128gcm_config_proto_rawDescData
+}
+
+var file_transport_internet_finalmask_mkcp_aes128gcm_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_transport_internet_finalmask_mkcp_aes128gcm_config_proto_goTypes = []any{
+	(*Config)(nil), // 0: xray.transport.internet.finalmask.mkcp.aes128gcm.Config
+}
+var file_transport_internet_finalmask_mkcp_aes128gcm_config_proto_depIdxs = []int32{
+	0, // [0:0] is the sub-list for method output_type
+	0, // [0:0] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_transport_internet_finalmask_mkcp_aes128gcm_config_proto_init() }
+func file_transport_internet_finalmask_mkcp_aes128gcm_config_proto_init() {
+	if File_transport_internet_finalmask_mkcp_aes128gcm_config_proto != nil {
+		return
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: unsafe.Slice(unsafe.StringData(file_transport_internet_finalmask_mkcp_aes128gcm_config_proto_rawDesc), len(file_transport_internet_finalmask_mkcp_aes128gcm_config_proto_rawDesc)),
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_transport_internet_finalmask_mkcp_aes128gcm_config_proto_goTypes,
+		DependencyIndexes: file_transport_internet_finalmask_mkcp_aes128gcm_config_proto_depIdxs,
+		MessageInfos:      file_transport_internet_finalmask_mkcp_aes128gcm_config_proto_msgTypes,
+	}.Build()
+	File_transport_internet_finalmask_mkcp_aes128gcm_config_proto = out.File
+	file_transport_internet_finalmask_mkcp_aes128gcm_config_proto_goTypes = nil
+	file_transport_internet_finalmask_mkcp_aes128gcm_config_proto_depIdxs = nil
+}

transport/internet/finalmask/mkcp/aes128gcm/config.proto

@@ -0,0 +1,11 @@
+syntax = "proto3";
+
+package xray.transport.internet.finalmask.mkcp.aes128gcm;
+option csharp_namespace = "Xray.Transport.Internet.Finalmask.Mkcp.Aes128Gcm";
+option go_package = "github.com/xtls/xray-core/transport/internet/finalmask/mkcp/aes128gcm";
+option java_package = "com.xray.transport.internet.finalmask.mkcp.aes128gcm";
+option java_multiple_files = true;
+
+message Config {
+    string password = 1;
+}

transport/internet/finalmask/mkcp/aes128gcm/conn.go

@@ -0,0 +1,174 @@
+package aes128gcm
+
+import (
+	"crypto/cipher"
+	"crypto/rand"
+	"crypto/sha256"
+	"io"
+	"net"
+	sync "sync"
+	"time"
+
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/crypto"
+	"github.com/xtls/xray-core/common/errors"
+)
+
+type aes128gcmConn struct {
+	first     bool
+	leaveSize int32
+
+	conn net.PacketConn
+	aead cipher.AEAD
+
+	readBuf    []byte
+	readMutex  sync.Mutex
+	writeBuf   []byte
+	writeMutex sync.Mutex
+}
+
+func NewConnClient(c *Config, raw net.PacketConn, first bool, leaveSize int32) (net.PacketConn, error) {
+	hashedPsk := sha256.Sum256([]byte(c.Password))
+
+	conn := &aes128gcmConn{
+		first:     first,
+		leaveSize: leaveSize,
+
+		conn: raw,
+		aead: crypto.NewAesGcm(hashedPsk[:16]),
+	}
+
+	if first {
+		conn.readBuf = make([]byte, 8192)
+		conn.writeBuf = make([]byte, 8192)
+	}
+
+	return conn, nil
+}
+
+func NewConnServer(c *Config, raw net.PacketConn, first bool, leaveSize int32) (net.PacketConn, error) {
+	return NewConnClient(c, raw, first, leaveSize)
+}
+
+func (c *aes128gcmConn) Size() int32 {
+	return int32(c.aead.NonceSize()) + int32(c.aead.Overhead())
+}
+
+func (c *aes128gcmConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
+	if c.first {
+		c.readMutex.Lock()
+
+		n, addr, err = c.conn.ReadFrom(c.readBuf)
+		if err != nil {
+			c.readMutex.Unlock()
+			return n, addr, err
+		}
+
+		if n < int(c.Size()) {
+			c.readMutex.Unlock()
+			return 0, addr, errors.New("aead").Base(io.ErrShortBuffer)
+		}
+
+		if len(p) < n-int(c.Size()) {
+			c.readMutex.Unlock()
+			return 0, addr, errors.New("aead").Base(io.ErrShortBuffer)
+		}
+
+		nonceSize := c.aead.NonceSize()
+		nonce := c.readBuf[:nonceSize]
+		ciphertext := c.readBuf[nonceSize:n]
+		_, err = c.aead.Open(p[:0], nonce, ciphertext, nil)
+		if err != nil {
+			c.readMutex.Unlock()
+			return 0, addr, errors.New("aead open").Base(err)
+		}
+
+		c.readMutex.Unlock()
+		return n - int(c.Size()), addr, nil
+	}
+
+	n, addr, err = c.conn.ReadFrom(p)
+	if err != nil {
+		return n, addr, err
+	}
+
+	if n < int(c.Size()) {
+		return 0, addr, errors.New("aead").Base(io.ErrShortBuffer)
+	}
+
+	nonceSize := c.aead.NonceSize()
+	nonce := p[:nonceSize]
+	ciphertext := p[nonceSize:n]
+	_, err = c.aead.Open(ciphertext[:0], nonce, ciphertext, nil)
+	if err != nil {
+		return 0, addr, errors.New("aead open").Base(err)
+	}
+	copy(p, p[nonceSize:n-c.aead.Overhead()])
+
+	return n - int(c.Size()), addr, nil
+}
+
+func (c *aes128gcmConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
+	if c.first {
+		if c.leaveSize+c.Size()+int32(len(p)) > 8192 {
+			return 0, errors.New("too many masks")
+		}
+
+		c.writeMutex.Lock()
+
+		n = copy(c.writeBuf[c.leaveSize+int32(c.aead.NonceSize()):], p)
+		// n = copy(c.writeBuf[c.leaveSize+c.Size():], p)
+		n += int(c.leaveSize) + int(c.Size())
+
+		nonceSize := c.aead.NonceSize()
+		nonce := c.writeBuf[c.leaveSize : c.leaveSize+int32(nonceSize)]
+		common.Must2(rand.Read(nonce))
+		// copy(c.writeBuf[c.leaveSize+int32(nonceSize):], c.writeBuf[c.leaveSize+c.Size():n])
+		plaintext := c.writeBuf[c.leaveSize+int32(nonceSize) : n-c.aead.Overhead()]
+		_ = c.aead.Seal(plaintext[:0], nonce, plaintext, nil)
+
+		nn, err := c.conn.WriteTo(c.writeBuf[:n], addr)
+
+		if err != nil {
+			c.writeMutex.Unlock()
+			return 0, err
+		}
+
+		if nn != n {
+			c.writeMutex.Unlock()
+			return 0, errors.New("nn != n")
+		}
+
+		c.writeMutex.Unlock()
+		return len(p), nil
+	}
+
+	nonceSize := c.aead.NonceSize()
+	nonce := p[c.leaveSize : c.leaveSize+int32(nonceSize)]
+	common.Must2(rand.Read(nonce))
+	copy(p[c.leaveSize+int32(nonceSize):], p[c.leaveSize+c.Size():])
+	plaintext := p[c.leaveSize+int32(nonceSize) : len(p)-c.aead.Overhead()]
+	_ = c.aead.Seal(plaintext[:0], nonce, plaintext, nil)
+
+	return c.conn.WriteTo(p, addr)
+}
+
+func (c *aes128gcmConn) Close() error {
+	return c.conn.Close()
+}
+
+func (c *aes128gcmConn) LocalAddr() net.Addr {
+	return c.conn.LocalAddr()
+}
+
+func (c *aes128gcmConn) SetDeadline(t time.Time) error {
+	return c.conn.SetDeadline(t)
+}
+
+func (c *aes128gcmConn) SetReadDeadline(t time.Time) error {
+	return c.conn.SetReadDeadline(t)
+}
+
+func (c *aes128gcmConn) SetWriteDeadline(t time.Time) error {
+	return c.conn.SetWriteDeadline(t)
+}

transport/internet/finalmask/mkcp/original/config.go

@@ -0,0 +1,16 @@
+package original
+
+import (
+	"net"
+)
+
+func (c *Config) UDP() {
+}
+
+func (c *Config) WrapPacketConnClient(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error) {
+	return NewConnClient(c, raw, first, leaveSize)
+}
+
+func (c *Config) WrapPacketConnServer(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error) {
+	return NewConnServer(c, raw, first, leaveSize)
+}

transport/internet/finalmask/mkcp/original/config.pb.go

@@ -0,0 +1,114 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.36.10
+// 	protoc        v6.33.1
+// source: transport/internet/finalmask/mkcp/original/config.proto
+
+package original
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+	unsafe "unsafe"
+)
+
+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 Config struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *Config) Reset() {
+	*x = Config{}
+	mi := &file_transport_internet_finalmask_mkcp_original_config_proto_msgTypes[0]
+	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_transport_internet_finalmask_mkcp_original_config_proto_msgTypes[0]
+	if 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_transport_internet_finalmask_mkcp_original_config_proto_rawDescGZIP(), []int{0}
+}
+
+var File_transport_internet_finalmask_mkcp_original_config_proto protoreflect.FileDescriptor
+
+const file_transport_internet_finalmask_mkcp_original_config_proto_rawDesc = "" +
+	"\n" +
+	"7transport/internet/finalmask/mkcp/original/config.proto\x12/xray.transport.internet.finalmask.mkcp.original\"\b\n" +
+	"\x06ConfigB\xaf\x01\n" +
+	"3com.xray.transport.internet.finalmask.mkcp.originalP\x01ZDgithub.com/xtls/xray-core/transport/internet/finalmask/mkcp/original\xaa\x02/Xray.Transport.Internet.Finalmask.Mkcp.Originalb\x06proto3"
+
+var (
+	file_transport_internet_finalmask_mkcp_original_config_proto_rawDescOnce sync.Once
+	file_transport_internet_finalmask_mkcp_original_config_proto_rawDescData []byte
+)
+
+func file_transport_internet_finalmask_mkcp_original_config_proto_rawDescGZIP() []byte {
+	file_transport_internet_finalmask_mkcp_original_config_proto_rawDescOnce.Do(func() {
+		file_transport_internet_finalmask_mkcp_original_config_proto_rawDescData = protoimpl.X.CompressGZIP(unsafe.Slice(unsafe.StringData(file_transport_internet_finalmask_mkcp_original_config_proto_rawDesc), len(file_transport_internet_finalmask_mkcp_original_config_proto_rawDesc)))
+	})
+	return file_transport_internet_finalmask_mkcp_original_config_proto_rawDescData
+}
+
+var file_transport_internet_finalmask_mkcp_original_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_transport_internet_finalmask_mkcp_original_config_proto_goTypes = []any{
+	(*Config)(nil), // 0: xray.transport.internet.finalmask.mkcp.original.Config
+}
+var file_transport_internet_finalmask_mkcp_original_config_proto_depIdxs = []int32{
+	0, // [0:0] is the sub-list for method output_type
+	0, // [0:0] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_transport_internet_finalmask_mkcp_original_config_proto_init() }
+func file_transport_internet_finalmask_mkcp_original_config_proto_init() {
+	if File_transport_internet_finalmask_mkcp_original_config_proto != nil {
+		return
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: unsafe.Slice(unsafe.StringData(file_transport_internet_finalmask_mkcp_original_config_proto_rawDesc), len(file_transport_internet_finalmask_mkcp_original_config_proto_rawDesc)),
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_transport_internet_finalmask_mkcp_original_config_proto_goTypes,
+		DependencyIndexes: file_transport_internet_finalmask_mkcp_original_config_proto_depIdxs,
+		MessageInfos:      file_transport_internet_finalmask_mkcp_original_config_proto_msgTypes,
+	}.Build()
+	File_transport_internet_finalmask_mkcp_original_config_proto = out.File
+	file_transport_internet_finalmask_mkcp_original_config_proto_goTypes = nil
+	file_transport_internet_finalmask_mkcp_original_config_proto_depIdxs = nil
+}

transport/internet/finalmask/mkcp/original/config.proto

@@ -0,0 +1,9 @@
+syntax = "proto3";
+
+package xray.transport.internet.finalmask.mkcp.original;
+option csharp_namespace = "Xray.Transport.Internet.Finalmask.Mkcp.Original";
+option go_package = "github.com/xtls/xray-core/transport/internet/finalmask/mkcp/original";
+option java_package = "com.xray.transport.internet.finalmask.mkcp.original";
+option java_multiple_files = true;
+
+message Config {}

transport/internet/finalmask/mkcp/original/conn.go

@@ -0,0 +1,225 @@
+package original
+
+import (
+	"crypto/cipher"
+	"encoding/binary"
+	"hash/fnv"
+	"io"
+	"net"
+	sync "sync"
+	"time"
+
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/errors"
+)
+
+type simple struct{}
+
+func NewSimple() *simple {
+	return &simple{}
+}
+
+func (*simple) NonceSize() int {
+	return 0
+}
+
+func (*simple) Overhead() int {
+	return 6
+}
+
+func (a *simple) Seal(dst, nonce, plain, extra []byte) []byte {
+	dst = append(dst, 0, 0, 0, 0, 0, 0)
+	binary.BigEndian.PutUint16(dst[4:], uint16(len(plain)))
+	dst = append(dst, plain...)
+
+	fnvHash := fnv.New32a()
+	common.Must2(fnvHash.Write(dst[4:]))
+	fnvHash.Sum(dst[:0])
+
+	dstLen := len(dst)
+	xtra := 4 - dstLen%4
+	if xtra != 4 {
+		dst = append(dst, make([]byte, xtra)...)
+	}
+	xorfwd(dst)
+	if xtra != 4 {
+		dst = dst[:dstLen]
+	}
+	return dst
+}
+
+func (a *simple) Open(dst, nonce, cipherText, extra []byte) ([]byte, error) {
+	dst = append(dst, cipherText...)
+	dstLen := len(dst)
+	xtra := 4 - dstLen%4
+	if xtra != 4 {
+		dst = append(dst, make([]byte, xtra)...)
+	}
+	xorbkd(dst)
+	if xtra != 4 {
+		dst = dst[:dstLen]
+	}
+
+	fnvHash := fnv.New32a()
+	common.Must2(fnvHash.Write(dst[4:]))
+	if binary.BigEndian.Uint32(dst[:4]) != fnvHash.Sum32() {
+		return nil, errors.New("invalid auth")
+	}
+
+	length := binary.BigEndian.Uint16(dst[4:6])
+	if len(dst)-6 != int(length) {
+		return nil, errors.New("invalid auth")
+	}
+
+	return dst[6:], nil
+}
+
+type simpleConn struct {
+	first     bool
+	leaveSize int32
+
+	conn net.PacketConn
+	aead cipher.AEAD
+
+	readBuf    []byte
+	readMutex  sync.Mutex
+	writeBuf   []byte
+	writeMutex sync.Mutex
+}
+
+func NewConnClient(c *Config, raw net.PacketConn, first bool, leaveSize int32) (net.PacketConn, error) {
+	conn := &simpleConn{
+		first:     first,
+		leaveSize: leaveSize,
+
+		conn: raw,
+		aead: &simple{},
+	}
+
+	if first {
+		conn.readBuf = make([]byte, 8192)
+		conn.writeBuf = make([]byte, 8192)
+	}
+
+	return conn, nil
+}
+
+func NewConnServer(c *Config, raw net.PacketConn, first bool, leaveSize int32) (net.PacketConn, error) {
+	return NewConnClient(c, raw, first, leaveSize)
+}
+
+func (c *simpleConn) Size() int32 {
+	return int32(c.aead.NonceSize()) + int32(c.aead.Overhead())
+}
+
+func (c *simpleConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
+	if c.first {
+		c.readMutex.Lock()
+
+		n, addr, err = c.conn.ReadFrom(c.readBuf)
+		if err != nil {
+			c.readMutex.Unlock()
+			return n, addr, err
+		}
+
+		if n < int(c.Size()) {
+			c.readMutex.Unlock()
+			return 0, addr, errors.New("aead").Base(io.ErrShortBuffer)
+		}
+
+		if len(p) < n-int(c.Size()) {
+			c.readMutex.Unlock()
+			return 0, addr, errors.New("aead").Base(io.ErrShortBuffer)
+		}
+
+		ciphertext := c.readBuf[:n]
+		opened, err := c.aead.Open(nil, nil, ciphertext, nil)
+		if err != nil {
+			c.readMutex.Unlock()
+			return 0, addr, errors.New("aead open").Base(err)
+		}
+
+		copy(p, opened)
+
+		c.readMutex.Unlock()
+		return n - int(c.Size()), addr, nil
+	}
+
+	n, addr, err = c.conn.ReadFrom(p)
+	if err != nil {
+		return n, addr, err
+	}
+
+	if n < int(c.Size()) {
+		return 0, addr, errors.New("aead").Base(io.ErrShortBuffer)
+	}
+
+	ciphertext := p[:n]
+	opened, err := c.aead.Open(nil, nil, ciphertext, nil)
+	if err != nil {
+		c.readMutex.Unlock()
+		return 0, addr, errors.New("aead open").Base(err)
+	}
+
+	copy(p, opened)
+
+	return n - int(c.Size()), addr, nil
+}
+
+func (c *simpleConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
+	if c.first {
+		if c.leaveSize+c.Size()+int32(len(p)) > 8192 {
+			return 0, errors.New("too many masks")
+		}
+
+		c.writeMutex.Lock()
+
+		n = copy(c.writeBuf[c.leaveSize+c.Size():], p)
+		n += int(c.leaveSize) + int(c.Size())
+
+		plaintext := c.writeBuf[c.leaveSize+c.Size() : n]
+		sealed := c.aead.Seal(nil, nil, plaintext, nil)
+		copy(c.writeBuf[c.leaveSize:], sealed)
+
+		nn, err := c.conn.WriteTo(c.writeBuf[:n], addr)
+
+		if err != nil {
+			c.writeMutex.Unlock()
+			return 0, err
+		}
+
+		if nn != n {
+			c.writeMutex.Unlock()
+			return 0, errors.New("nn != n")
+		}
+
+		c.writeMutex.Unlock()
+		return len(p), nil
+	}
+
+	plaintext := p[c.leaveSize+c.Size():]
+	sealed := c.aead.Seal(nil, nil, plaintext, nil)
+	copy(p[c.leaveSize:], sealed)
+
+	return c.conn.WriteTo(p, addr)
+}
+
+func (c *simpleConn) Close() error {
+	return c.conn.Close()
+}
+
+func (c *simpleConn) LocalAddr() net.Addr {
+	return c.conn.LocalAddr()
+}
+
+func (c *simpleConn) SetDeadline(t time.Time) error {
+	return c.conn.SetDeadline(t)
+}
+
+func (c *simpleConn) SetReadDeadline(t time.Time) error {
+	return c.conn.SetReadDeadline(t)
+}
+
+func (c *simpleConn) SetWriteDeadline(t time.Time) error {
+	return c.conn.SetWriteDeadline(t)
+}

transport/internet/finalmask/mkcp/original/simple_test.go

@@ -0,0 +1,19 @@
+package original_test
+
+import (
+	"crypto/rand"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/xtls/xray-core/transport/internet/finalmask/mkcp/original"
+)
+
+func TestOriginalBounce(t *testing.T) {
+	aead := original.NewSimple()
+	buf := make([]byte, aead.NonceSize()+aead.Overhead())
+	for i := 0; i < 1000; i++ {
+		_, _ = rand.Read(buf)
+		_, err := aead.Open(buf[:0], nil, buf, nil)
+		assert.NotEqual(t, err, nil)
+	}
+}

transport/internet/finalmask/mkcp/original/xor.go

@@ -1,7 +1,7 @@
 //go:build !amd64
 // +build !amd64
 
-package kcp
+package original
 
 // xorfwd performs XOR forwards in words, x[i] ^= x[i-4], i from 0 to len
 func xorfwd(x []byte) {

transport/internet/finalmask/mkcp/original/xor_amd64.go

@@ -1,4 +1,4 @@
-package kcp
+package original
 
 //go:noescape
 func xorfwd(x []byte)

transport/internet/finalmask/salamander/config.go

@@ -2,41 +2,15 @@ package salamander
 
 import (
 	"net"
-
-	"github.com/xtls/xray-core/common/errors"
-	"github.com/xtls/xray-core/transport/internet/finalmask/salamander/obfs"
 )
 
 func (c *Config) UDP() {
 }
 
-func (c *Config) WrapConnClient(raw net.Conn) (net.Conn, error) {
-	return raw, nil
+func (c *Config) WrapPacketConnClient(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error) {
+	return NewConnClient(c, raw, first, leaveSize)
 }
 
-func (c *Config) WrapConnServer(raw net.Conn) (net.Conn, error) {
-	return raw, nil
-}
-
-func (c *Config) WrapPacketConnClient(raw net.PacketConn) (net.PacketConn, error) {
-	ob, err := obfs.NewSalamanderObfuscator([]byte(c.Password))
-	if err != nil {
-		return nil, errors.New("salamander err").Base(err)
-	}
-	return obfs.WrapPacketConn(raw, ob), nil
-}
-
-func (c *Config) WrapPacketConnServer(raw net.PacketConn) (net.PacketConn, error) {
-	ob, err := obfs.NewSalamanderObfuscator([]byte(c.Password))
-	if err != nil {
-		return nil, errors.New("salamander err").Base(err)
-	}
-	return obfs.WrapPacketConn(raw, ob), nil
-}
-
-func (c *Config) Size() int {
-	return 0
-}
-
-func (c *Config) Serialize([]byte) {
+func (c *Config) WrapPacketConnServer(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error) {
+	return NewConnServer(c, raw, first, leaveSize)
 }

transport/internet/finalmask/salamander/config.pb.go

@@ -2,7 +2,7 @@
 // versions:
 // 	protoc-gen-go v1.36.10
 // 	protoc        v6.33.1
-// source: transport/internet/udpmask/salamander/config.proto
+// source: transport/internet/finalmask/salamander/config.proto
 
 package salamander
 
@@ -30,7 +30,7 @@ type Config struct {
 
 func (x *Config) Reset() {
 	*x = Config{}
-	mi := &file_transport_internet_udpmask_salamander_config_proto_msgTypes[0]
+	mi := &file_transport_internet_finalmask_salamander_config_proto_msgTypes[0]
 	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 	ms.StoreMessageInfo(mi)
 }
@@ -42,7 +42,7 @@ func (x *Config) String() string {
 func (*Config) ProtoMessage() {}
 
 func (x *Config) ProtoReflect() protoreflect.Message {
-	mi := &file_transport_internet_udpmask_salamander_config_proto_msgTypes[0]
+	mi := &file_transport_internet_finalmask_salamander_config_proto_msgTypes[0]
 	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -55,7 +55,7 @@ func (x *Config) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Config.ProtoReflect.Descriptor instead.
 func (*Config) Descriptor() ([]byte, []int) {
-	return file_transport_internet_udpmask_salamander_config_proto_rawDescGZIP(), []int{0}
+	return file_transport_internet_finalmask_salamander_config_proto_rawDescGZIP(), []int{0}
 }
 
 func (x *Config) GetPassword() string {
@@ -65,32 +65,32 @@ func (x *Config) GetPassword() string {
 	return ""
 }
 
-var File_transport_internet_udpmask_salamander_config_proto protoreflect.FileDescriptor
+var File_transport_internet_finalmask_salamander_config_proto protoreflect.FileDescriptor
 
-const file_transport_internet_udpmask_salamander_config_proto_rawDesc = "" +
+const file_transport_internet_finalmask_salamander_config_proto_rawDesc = "" +
 	"\n" +
-	"2transport/internet/udpmask/salamander/config.proto\x12*xray.transport.internet.udpmask.salamander\"$\n" +
+	"4transport/internet/finalmask/salamander/config.proto\x12,xray.transport.internet.finalmask.salamander\"$\n" +
 	"\x06Config\x12\x1a\n" +
-	"\bpassword\x18\x01 \x01(\tR\bpasswordB\xa0\x01\n" +
-	".com.xray.transport.internet.udpmask.salamanderP\x01Z?github.com/xtls/xray-core/transport/internet/udpmask/salamander\xaa\x02*Xray.Transport.Internet.Udpmask.Salamanderb\x06proto3"
+	"\bpassword\x18\x01 \x01(\tR\bpasswordB\xa6\x01\n" +
+	"0com.xray.transport.internet.finalmask.salamanderP\x01ZAgithub.com/xtls/xray-core/transport/internet/finalmask/salamander\xaa\x02,Xray.Transport.Internet.Finalmask.Salamanderb\x06proto3"
 
 var (
-	file_transport_internet_udpmask_salamander_config_proto_rawDescOnce sync.Once
-	file_transport_internet_udpmask_salamander_config_proto_rawDescData []byte
+	file_transport_internet_finalmask_salamander_config_proto_rawDescOnce sync.Once
+	file_transport_internet_finalmask_salamander_config_proto_rawDescData []byte
 )
 
-func file_transport_internet_udpmask_salamander_config_proto_rawDescGZIP() []byte {
-	file_transport_internet_udpmask_salamander_config_proto_rawDescOnce.Do(func() {
-		file_transport_internet_udpmask_salamander_config_proto_rawDescData = protoimpl.X.CompressGZIP(unsafe.Slice(unsafe.StringData(file_transport_internet_udpmask_salamander_config_proto_rawDesc), len(file_transport_internet_udpmask_salamander_config_proto_rawDesc)))
+func file_transport_internet_finalmask_salamander_config_proto_rawDescGZIP() []byte {
+	file_transport_internet_finalmask_salamander_config_proto_rawDescOnce.Do(func() {
+		file_transport_internet_finalmask_salamander_config_proto_rawDescData = protoimpl.X.CompressGZIP(unsafe.Slice(unsafe.StringData(file_transport_internet_finalmask_salamander_config_proto_rawDesc), len(file_transport_internet_finalmask_salamander_config_proto_rawDesc)))
 	})
-	return file_transport_internet_udpmask_salamander_config_proto_rawDescData
+	return file_transport_internet_finalmask_salamander_config_proto_rawDescData
 }
 
-var file_transport_internet_udpmask_salamander_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
-var file_transport_internet_udpmask_salamander_config_proto_goTypes = []any{
-	(*Config)(nil), // 0: xray.transport.internet.udpmask.salamander.Config
+var file_transport_internet_finalmask_salamander_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_transport_internet_finalmask_salamander_config_proto_goTypes = []any{
+	(*Config)(nil), // 0: xray.transport.internet.finalmask.salamander.Config
 }
-var file_transport_internet_udpmask_salamander_config_proto_depIdxs = []int32{
+var file_transport_internet_finalmask_salamander_config_proto_depIdxs = []int32{
 	0, // [0:0] is the sub-list for method output_type
 	0, // [0:0] is the sub-list for method input_type
 	0, // [0:0] is the sub-list for extension type_name
@@ -98,26 +98,26 @@ var file_transport_internet_udpmask_salamander_config_proto_depIdxs = []int32{
 	0, // [0:0] is the sub-list for field type_name
 }
 
-func init() { file_transport_internet_udpmask_salamander_config_proto_init() }
-func file_transport_internet_udpmask_salamander_config_proto_init() {
-	if File_transport_internet_udpmask_salamander_config_proto != nil {
+func init() { file_transport_internet_finalmask_salamander_config_proto_init() }
+func file_transport_internet_finalmask_salamander_config_proto_init() {
+	if File_transport_internet_finalmask_salamander_config_proto != nil {
 		return
 	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
-			RawDescriptor: unsafe.Slice(unsafe.StringData(file_transport_internet_udpmask_salamander_config_proto_rawDesc), len(file_transport_internet_udpmask_salamander_config_proto_rawDesc)),
+			RawDescriptor: unsafe.Slice(unsafe.StringData(file_transport_internet_finalmask_salamander_config_proto_rawDesc), len(file_transport_internet_finalmask_salamander_config_proto_rawDesc)),
 			NumEnums:      0,
 			NumMessages:   1,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
-		GoTypes:           file_transport_internet_udpmask_salamander_config_proto_goTypes,
-		DependencyIndexes: file_transport_internet_udpmask_salamander_config_proto_depIdxs,
-		MessageInfos:      file_transport_internet_udpmask_salamander_config_proto_msgTypes,
+		GoTypes:           file_transport_internet_finalmask_salamander_config_proto_goTypes,
+		DependencyIndexes: file_transport_internet_finalmask_salamander_config_proto_depIdxs,
+		MessageInfos:      file_transport_internet_finalmask_salamander_config_proto_msgTypes,
 	}.Build()
-	File_transport_internet_udpmask_salamander_config_proto = out.File
-	file_transport_internet_udpmask_salamander_config_proto_goTypes = nil
-	file_transport_internet_udpmask_salamander_config_proto_depIdxs = nil
+	File_transport_internet_finalmask_salamander_config_proto = out.File
+	file_transport_internet_finalmask_salamander_config_proto_goTypes = nil
+	file_transport_internet_finalmask_salamander_config_proto_depIdxs = nil
 }

transport/internet/finalmask/salamander/config.proto

@@ -1,9 +1,9 @@
 syntax = "proto3";
 
-package xray.transport.internet.udpmask.salamander;
-option csharp_namespace = "Xray.Transport.Internet.Udpmask.Salamander";
-option go_package = "github.com/xtls/xray-core/transport/internet/udpmask/salamander";
-option java_package = "com.xray.transport.internet.udpmask.salamander";
+package xray.transport.internet.finalmask.salamander;
+option csharp_namespace = "Xray.Transport.Internet.Finalmask.Salamander";
+option go_package = "github.com/xtls/xray-core/transport/internet/finalmask/salamander";
+option java_package = "com.xray.transport.internet.finalmask.salamander";
 option java_multiple_files = true;
 
 message Config {

transport/internet/finalmask/salamander/conn.go

@@ -0,0 +1,147 @@
+package salamander
+
+import (
+	"io"
+	"net"
+	"sync"
+	"time"
+
+	"github.com/xtls/xray-core/common/errors"
+)
+
+type obfsPacketConn struct {
+	first     bool
+	leaveSize int32
+
+	conn net.PacketConn
+	obfs *SalamanderObfuscator
+
+	readBuf    []byte
+	readMutex  sync.Mutex
+	writeBuf   []byte
+	writeMutex sync.Mutex
+}
+
+func NewConnClient(c *Config, raw net.PacketConn, first bool, leaveSize int32) (net.PacketConn, error) {
+	ob, err := NewSalamanderObfuscator([]byte(c.Password))
+	if err != nil {
+		return nil, errors.New("salamander err").Base(err)
+	}
+
+	conn := &obfsPacketConn{
+		first:     first,
+		leaveSize: leaveSize,
+
+		conn: raw,
+		obfs: ob,
+	}
+
+	if first {
+		conn.readBuf = make([]byte, 8192)
+		conn.writeBuf = make([]byte, 8192)
+	}
+
+	return conn, nil
+}
+
+func NewConnServer(c *Config, raw net.PacketConn, first bool, leaveSize int32) (net.PacketConn, error) {
+	return NewConnClient(c, raw, first, leaveSize)
+}
+
+func (c *obfsPacketConn) Size() int32 {
+	return smSaltLen
+}
+
+func (c *obfsPacketConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
+	if c.first {
+		c.readMutex.Lock()
+
+		n, addr, err = c.conn.ReadFrom(c.readBuf)
+		if err != nil {
+			c.readMutex.Unlock()
+			return n, addr, err
+		}
+
+		if n < int(c.Size()) {
+			c.readMutex.Unlock()
+			return 0, addr, errors.New("salamander").Base(io.ErrShortBuffer)
+		}
+
+		if len(p) < n-int(c.Size()) {
+			c.readMutex.Unlock()
+			return 0, addr, errors.New("salamander").Base(io.ErrShortBuffer)
+		}
+
+		c.obfs.Deobfuscate(c.readBuf[:n], p)
+
+		c.readMutex.Unlock()
+		return n - int(c.Size()), addr, err
+	}
+
+	n, addr, err = c.conn.ReadFrom(p)
+	if err != nil {
+		return n, addr, err
+	}
+
+	if n < int(c.Size()) {
+		return 0, addr, errors.New("salamander").Base(io.ErrShortBuffer)
+	}
+
+	c.obfs.Deobfuscate(p[:n], p)
+
+	return n - int(c.Size()), addr, err
+}
+
+func (c *obfsPacketConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
+	if c.first {
+		if c.leaveSize+c.Size()+int32(len(p)) > 8192 {
+			return 0, errors.New("too many masks")
+		}
+
+		c.writeMutex.Lock()
+
+		n = copy(c.writeBuf[c.leaveSize+c.Size():], p)
+		n += int(c.leaveSize) + int(c.Size())
+
+		c.obfs.Obfuscate(c.writeBuf[c.leaveSize+c.Size():n], c.writeBuf[c.leaveSize:n])
+
+		nn, err := c.conn.WriteTo(c.writeBuf[:n], addr)
+
+		if err != nil {
+			c.writeMutex.Unlock()
+			return 0, err
+		}
+
+		if nn != n {
+			c.writeMutex.Unlock()
+			return 0, errors.New("nn != n")
+		}
+
+		c.writeMutex.Unlock()
+		return len(p), nil
+	}
+
+	c.obfs.Obfuscate(p[c.leaveSize+c.Size():], p[c.leaveSize:])
+
+	return c.conn.WriteTo(p, addr)
+}
+
+func (c *obfsPacketConn) Close() error {
+	return c.conn.Close()
+}
+
+func (c *obfsPacketConn) LocalAddr() net.Addr {
+	return c.conn.LocalAddr()
+}
+
+func (c *obfsPacketConn) SetDeadline(t time.Time) error {
+	return c.conn.SetDeadline(t)
+}
+
+func (c *obfsPacketConn) SetReadDeadline(t time.Time) error {
+	return c.conn.SetReadDeadline(t)
+}
+
+func (c *obfsPacketConn) SetWriteDeadline(t time.Time) error {
+	return c.conn.SetWriteDeadline(t)
+}

transport/internet/finalmask/salamander/obfs/conn.go

@@ -1,121 +0,0 @@
-package obfs
-
-import (
-	"net"
-	"sync"
-	"syscall"
-	"time"
-)
-
-const udpBufferSize = 2048 // QUIC packets are at most 1500 bytes long, so 2k should be more than enough
-
-// Obfuscator is the interface that wraps the Obfuscate and Deobfuscate methods.
-// Both methods return the number of bytes written to out.
-// If a packet is not valid, the methods should return 0.
-type Obfuscator interface {
-	Obfuscate(in, out []byte) int
-	Deobfuscate(in, out []byte) int
-}
-
-var _ net.PacketConn = (*obfsPacketConn)(nil)
-
-type obfsPacketConn struct {
-	Conn net.PacketConn
-	Obfs Obfuscator
-
-	readBuf    []byte
-	readMutex  sync.Mutex
-	writeBuf   []byte
-	writeMutex sync.Mutex
-}
-
-// obfsPacketConnUDP is a special case of obfsPacketConn that uses a UDPConn
-// as the underlying connection. We pass additional methods to quic-go to
-// enable UDP-specific optimizations.
-type obfsPacketConnUDP struct {
-	*obfsPacketConn
-	UDPConn *net.UDPConn
-}
-
-// WrapPacketConn enables obfuscation on a net.PacketConn.
-// The obfuscation is transparent to the caller - the n bytes returned by
-// ReadFrom and WriteTo are the number of original bytes, not after
-// obfuscation/deobfuscation.
-func WrapPacketConn(conn net.PacketConn, obfs Obfuscator) net.PacketConn {
-	opc := &obfsPacketConn{
-		Conn:     conn,
-		Obfs:     obfs,
-		readBuf:  make([]byte, udpBufferSize),
-		writeBuf: make([]byte, udpBufferSize),
-	}
-	if udpConn, ok := conn.(*net.UDPConn); ok {
-		return &obfsPacketConnUDP{
-			obfsPacketConn: opc,
-			UDPConn:        udpConn,
-		}
-	} else {
-		return opc
-	}
-}
-
-func (c *obfsPacketConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
-	for {
-		c.readMutex.Lock()
-		n, addr, err = c.Conn.ReadFrom(c.readBuf)
-		if n <= 0 {
-			c.readMutex.Unlock()
-			return n, addr, err
-		}
-		n = c.Obfs.Deobfuscate(c.readBuf[:n], p)
-		c.readMutex.Unlock()
-		if n > 0 || err != nil {
-			return n, addr, err
-		}
-		// Invalid packet, try again
-	}
-}
-
-func (c *obfsPacketConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
-	c.writeMutex.Lock()
-	nn := c.Obfs.Obfuscate(p, c.writeBuf)
-	_, err = c.Conn.WriteTo(c.writeBuf[:nn], addr)
-	c.writeMutex.Unlock()
-	if err == nil {
-		n = len(p)
-	}
-	return n, err
-}
-
-func (c *obfsPacketConn) Close() error {
-	return c.Conn.Close()
-}
-
-func (c *obfsPacketConn) LocalAddr() net.Addr {
-	return c.Conn.LocalAddr()
-}
-
-func (c *obfsPacketConn) SetDeadline(t time.Time) error {
-	return c.Conn.SetDeadline(t)
-}
-
-func (c *obfsPacketConn) SetReadDeadline(t time.Time) error {
-	return c.Conn.SetReadDeadline(t)
-}
-
-func (c *obfsPacketConn) SetWriteDeadline(t time.Time) error {
-	return c.Conn.SetWriteDeadline(t)
-}
-
-// UDP-specific methods below
-
-func (c *obfsPacketConnUDP) SetReadBuffer(bytes int) error {
-	return c.UDPConn.SetReadBuffer(bytes)
-}
-
-func (c *obfsPacketConnUDP) SetWriteBuffer(bytes int) error {
-	return c.UDPConn.SetWriteBuffer(bytes)
-}
-
-func (c *obfsPacketConnUDP) SyscallConn() (syscall.RawConn, error) {
-	return c.UDPConn.SyscallConn()
-}

transport/internet/finalmask/salamander/obfs/salamander_test.go

@@ -1,45 +0,0 @@
-package obfs
-
-import (
-	"crypto/rand"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func BenchmarkSalamanderObfuscator_Obfuscate(b *testing.B) {
-	o, _ := NewSalamanderObfuscator([]byte("average_password"))
-	in := make([]byte, 1200)
-	_, _ = rand.Read(in)
-	out := make([]byte, 2048)
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		o.Obfuscate(in, out)
-	}
-}
-
-func BenchmarkSalamanderObfuscator_Deobfuscate(b *testing.B) {
-	o, _ := NewSalamanderObfuscator([]byte("average_password"))
-	in := make([]byte, 1200)
-	_, _ = rand.Read(in)
-	out := make([]byte, 2048)
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		o.Deobfuscate(in, out)
-	}
-}
-
-func TestSalamanderObfuscator(t *testing.T) {
-	o, _ := NewSalamanderObfuscator([]byte("average_password"))
-	in := make([]byte, 1200)
-	oOut := make([]byte, 2048)
-	dOut := make([]byte, 2048)
-	for i := 0; i < 1000; i++ {
-		_, _ = rand.Read(in)
-		n := o.Obfuscate(in, oOut)
-		assert.Equal(t, len(in)+smSaltLen, n)
-		n = o.Deobfuscate(oOut[:n], dOut)
-		assert.Equal(t, len(in), n)
-		assert.Equal(t, in, dOut[:n])
-	}
-}

transport/internet/finalmask/salamander/salamander.go

@@ -1,4 +1,4 @@
-package obfs
+package salamander
 
 import (
 	"fmt"
@@ -15,8 +15,6 @@ const (
 	smKeyLen    = blake2b.Size256
 )
 
-var _ Obfuscator = (*SalamanderObfuscator)(nil)
-
 var ErrPSKTooShort = fmt.Errorf("PSK must be at least %d bytes", smPSKMinLen)
 
 // SalamanderObfuscator is an obfuscator that obfuscates each packet with

transport/internet/finalmask/salamander/salamander_test.go

@@ -0,0 +1,81 @@
+package salamander_test
+
+import (
+	"crypto/rand"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/xtls/xray-core/transport/internet/finalmask/salamander"
+)
+
+const (
+	smSaltLen = 8
+)
+
+func BenchmarkSalamanderObfuscator_Obfuscate(b *testing.B) {
+	o, _ := salamander.NewSalamanderObfuscator([]byte("average_password"))
+	in := make([]byte, 1200)
+	_, _ = rand.Read(in)
+	out := make([]byte, 2048)
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		o.Obfuscate(in, out)
+	}
+}
+
+func BenchmarkSalamanderObfuscator_Deobfuscate(b *testing.B) {
+	o, _ := salamander.NewSalamanderObfuscator([]byte("average_password"))
+	in := make([]byte, 1200)
+	_, _ = rand.Read(in)
+	out := make([]byte, 2048)
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		o.Deobfuscate(in, out)
+	}
+}
+
+func TestSalamanderObfuscator(t *testing.T) {
+	o, _ := salamander.NewSalamanderObfuscator([]byte("average_password"))
+	in := make([]byte, 1200)
+	oOut := make([]byte, 2048)
+	dOut := make([]byte, 2048)
+	for i := 0; i < 1000; i++ {
+		_, _ = rand.Read(in)
+		n := o.Obfuscate(in, oOut)
+		assert.Equal(t, len(in)+smSaltLen, n)
+		n = o.Deobfuscate(oOut[:n], dOut)
+		assert.Equal(t, len(in), n)
+		assert.Equal(t, in, dOut[:n])
+	}
+}
+
+func TestSalamanderInPlace(t *testing.T) {
+	o, _ := salamander.NewSalamanderObfuscator([]byte("average_password"))
+
+	in := make([]byte, 1200)
+	out := make([]byte, 2048)
+	_, _ = rand.Read(in)
+	o.Obfuscate(in, out)
+
+	out2 := make([]byte, 2048)
+	copy(out2[smSaltLen:], in)
+	o.Obfuscate(out2[smSaltLen:], out2)
+
+	dOut := make([]byte, 2048)
+	o.Deobfuscate(out, dOut)
+
+	o.Deobfuscate(out2, out2)
+
+	assert.Equal(t, in, dOut[:1200])
+	assert.Equal(t, in, out2[:1200])
+}
+
+func TestSalamanderBounce(t *testing.T) {
+	o, _ := salamander.NewSalamanderObfuscator([]byte("average_password"))
+	buf := make([]byte, 8)
+	for i := 0; i < 1000; i++ {
+		_, _ = rand.Read(buf)
+		n := o.Deobfuscate(buf, buf)
+		assert.Equal(t, 0, n)
+	}
+}

transport/internet/finalmask/udp_test.go

@@ -0,0 +1,129 @@
+package finalmask_test
+
+import (
+	"bytes"
+	"net"
+	"testing"
+	"time"
+
+	"github.com/xtls/xray-core/transport/internet/finalmask"
+	"github.com/xtls/xray-core/transport/internet/finalmask/header/dns"
+	"github.com/xtls/xray-core/transport/internet/finalmask/header/srtp"
+	"github.com/xtls/xray-core/transport/internet/finalmask/header/utp"
+	"github.com/xtls/xray-core/transport/internet/finalmask/header/wechat"
+	"github.com/xtls/xray-core/transport/internet/finalmask/header/wireguard"
+	"github.com/xtls/xray-core/transport/internet/finalmask/mkcp/aes128gcm"
+	"github.com/xtls/xray-core/transport/internet/finalmask/mkcp/original"
+	"github.com/xtls/xray-core/transport/internet/finalmask/salamander"
+)
+
+func mustSendRecv(
+	t *testing.T,
+	from net.PacketConn,
+	to net.PacketConn,
+	msg []byte,
+) {
+	t.Helper()
+
+	go func() {
+		_, err := from.WriteTo(msg, to.LocalAddr())
+		if err != nil {
+			t.Error(err)
+		}
+	}()
+
+	buf := make([]byte, 1024)
+	n, _, err := to.ReadFrom(buf)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if n != len(msg) {
+		t.Fatalf("unexpected size: %d", n)
+	}
+
+	if !bytes.Equal(buf[:n], msg) {
+		t.Fatalf("unexpected data")
+	}
+}
+
+type layerMask struct {
+	name string
+	mask finalmask.Udpmask
+}
+
+func TestPacketConnReadWrite(t *testing.T) {
+	cases := []layerMask{
+		{
+			name: "aes128gcm",
+			mask: &aes128gcm.Config{Password: "123"},
+		},
+		{
+			name: "original",
+			mask: &original.Config{},
+		},
+		{
+			name: "dns",
+			mask: &dns.Config{Domain: "www.baidu.com"},
+		},
+		{
+			name: "srtp",
+			mask: &srtp.Config{},
+		},
+		{
+			name: "utp",
+			mask: &utp.Config{},
+		},
+		{
+			name: "wechat",
+			mask: &wechat.Config{},
+		},
+		{
+			name: "wireguard",
+			mask: &wireguard.Config{},
+		},
+		{
+			name: "salamander",
+			mask: &salamander.Config{Password: "1234"},
+		},
+	}
+
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			mask := c.mask
+
+			maskManager := finalmask.NewUdpmaskManager([]finalmask.Udpmask{mask, mask})
+
+			client, err := net.ListenPacket("udp", "127.0.0.1:0")
+			if err != nil {
+				t.Fatal(err)
+			}
+			defer client.Close()
+
+			client, err = maskManager.WrapPacketConnClient(client)
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			server, err := net.ListenPacket("udp", "127.0.0.1:0")
+			if err != nil {
+				t.Fatal(err)
+			}
+			defer server.Close()
+
+			server, err = maskManager.WrapPacketConnServer(server)
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			_ = client.SetDeadline(time.Now().Add(time.Second))
+			_ = server.SetDeadline(time.Now().Add(time.Second))
+
+			mustSendRecv(t, client, server, []byte("client -> server"))
+			mustSendRecv(t, server, client, []byte("server -> client"))
+
+			mustSendRecv(t, client, server, []byte{})
+			mustSendRecv(t, server, client, []byte{})
+		})
+	}
+}

transport/internet/finalmask/xdns/client.go

@@ -0,0 +1,373 @@
+package xdns
+
+import (
+	"bytes"
+	"context"
+	"crypto/rand"
+	"encoding/base32"
+	"encoding/binary"
+	"io"
+	"net"
+	"sync"
+	"time"
+
+	"github.com/xtls/xray-core/common/errors"
+)
+
+const (
+	numPadding          = 3
+	numPaddingForPoll   = 8
+	initPollDelay       = 500 * time.Millisecond
+	maxPollDelay        = 10 * time.Second
+	pollDelayMultiplier = 2.0
+	pollLimit           = 16
+)
+
+var base32Encoding = base32.StdEncoding.WithPadding(base32.NoPadding)
+
+type packet struct {
+	p    []byte
+	addr net.Addr
+}
+
+type xdnsConnClient struct {
+	conn net.PacketConn
+
+	clientID []byte
+	domain   Name
+
+	pollChan   chan struct{}
+	readQueue  chan *packet
+	writeQueue chan *packet
+
+	closed bool
+	mutex  sync.Mutex
+}
+
+func NewConnClient(c *Config, raw net.PacketConn, end bool) (net.PacketConn, error) {
+	if !end {
+		return nil, errors.New("xdns requires being at the outermost level")
+	}
+
+	domain, err := ParseName(c.Domain)
+	if err != nil {
+		return nil, err
+	}
+
+	conn := &xdnsConnClient{
+		conn: raw,
+
+		clientID: make([]byte, 8),
+		domain:   domain,
+
+		pollChan:   make(chan struct{}, pollLimit),
+		readQueue:  make(chan *packet, 128),
+		writeQueue: make(chan *packet, 128),
+	}
+
+	rand.Read(conn.clientID)
+
+	go conn.recvLoop()
+	go conn.sendLoop()
+
+	return conn, nil
+}
+
+func (c *xdnsConnClient) recvLoop() {
+	for {
+		if c.closed {
+			break
+		}
+
+		var buf [4096]byte
+
+		n, addr, err := c.conn.ReadFrom(buf[:])
+		if err != nil {
+			continue
+		}
+
+		resp, err := MessageFromWireFormat(buf[:n])
+		if err != nil {
+			continue
+		}
+
+		payload := dnsResponsePayload(&resp, c.domain)
+
+		r := bytes.NewReader(payload)
+		anyPacket := false
+		for {
+			p, err := nextPacket(r)
+			if err != nil {
+				break
+			}
+			anyPacket = true
+
+			buf := make([]byte, len(p))
+			copy(buf, p)
+			select {
+			case c.readQueue <- &packet{
+				p:    buf,
+				addr: addr,
+			}:
+			default:
+			}
+		}
+
+		if anyPacket {
+			select {
+			case c.pollChan <- struct{}{}:
+			default:
+			}
+		}
+	}
+
+	close(c.pollChan)
+	close(c.readQueue)
+}
+
+func (c *xdnsConnClient) sendLoop() {
+	var addr net.Addr
+
+	pollDelay := initPollDelay
+	pollTimer := time.NewTimer(pollDelay)
+	for {
+		var p *packet
+		pollTimerExpired := false
+
+		select {
+		case p = <-c.writeQueue:
+		default:
+			select {
+			case p = <-c.writeQueue:
+			case <-c.pollChan:
+			case <-pollTimer.C:
+				pollTimerExpired = true
+			}
+		}
+
+		if p != nil {
+			addr = p.addr
+
+			select {
+			case <-c.pollChan:
+			default:
+			}
+		} else if addr != nil {
+			encoded, _ := encode(nil, c.clientID, c.domain)
+			p = &packet{
+				p:    encoded,
+				addr: addr,
+			}
+		}
+
+		if pollTimerExpired {
+			pollDelay = time.Duration(float64(pollDelay) * pollDelayMultiplier)
+			if pollDelay > maxPollDelay {
+				pollDelay = maxPollDelay
+			}
+		} else {
+			if !pollTimer.Stop() {
+				<-pollTimer.C
+			}
+			pollDelay = initPollDelay
+		}
+		pollTimer.Reset(pollDelay)
+
+		if c.closed {
+			return
+		}
+
+		if p != nil {
+			_, _ = c.conn.WriteTo(p.p, p.addr)
+		}
+	}
+}
+
+func (c *xdnsConnClient) Size() int32 {
+	return 0
+}
+
+func (c *xdnsConnClient) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
+	packet, ok := <-c.readQueue
+	if !ok {
+		return 0, nil, io.EOF
+	}
+	n = copy(p, packet.p)
+	if n != len(packet.p) {
+		return 0, nil, io.ErrShortBuffer
+	}
+	return n, packet.addr, nil
+}
+
+func (c *xdnsConnClient) WriteTo(p []byte, addr net.Addr) (n int, err error) {
+	c.mutex.Lock()
+	defer c.mutex.Unlock()
+
+	if c.closed {
+		return 0, errors.New("xdns closed")
+	}
+
+	encoded, err := encode(p, c.clientID, c.domain)
+	if err != nil {
+		errors.LogDebug(context.Background(), "xdns encode err", err)
+		return 0, errors.New("xdns encode").Base(err)
+	}
+
+	select {
+	case c.writeQueue <- &packet{
+		p:    encoded,
+		addr: addr,
+	}:
+		return len(p), nil
+	default:
+		return 0, errors.New("xdns queue full")
+	}
+}
+
+func (c *xdnsConnClient) Close() error {
+	c.mutex.Lock()
+	defer c.mutex.Unlock()
+
+	if c.closed {
+		return nil
+	}
+
+	c.closed = true
+	close(c.writeQueue)
+
+	return c.conn.Close()
+}
+
+func (c *xdnsConnClient) LocalAddr() net.Addr {
+	return c.conn.LocalAddr()
+}
+
+func (c *xdnsConnClient) SetDeadline(t time.Time) error {
+	return c.conn.SetDeadline(t)
+}
+
+func (c *xdnsConnClient) SetReadDeadline(t time.Time) error {
+	return c.conn.SetReadDeadline(t)
+}
+
+func (c *xdnsConnClient) SetWriteDeadline(t time.Time) error {
+	return c.conn.SetWriteDeadline(t)
+}
+
+func encode(p []byte, clientID []byte, domain Name) ([]byte, error) {
+	var decoded []byte
+	{
+		if len(p) >= 224 {
+			return nil, errors.New("too long")
+		}
+		var buf bytes.Buffer
+		buf.Write(clientID[:])
+		n := numPadding
+		if len(p) == 0 {
+			n = numPaddingForPoll
+		}
+		buf.WriteByte(byte(224 + n))
+		_, _ = io.CopyN(&buf, rand.Reader, int64(n))
+		if len(p) > 0 {
+			buf.WriteByte(byte(len(p)))
+			buf.Write(p)
+		}
+		decoded = buf.Bytes()
+	}
+
+	encoded := make([]byte, base32Encoding.EncodedLen(len(decoded)))
+	base32Encoding.Encode(encoded, decoded)
+	encoded = bytes.ToLower(encoded)
+	labels := chunks(encoded, 63)
+	labels = append(labels, domain...)
+	name, err := NewName(labels)
+	if err != nil {
+		return nil, err
+	}
+
+	var id uint16
+	_ = binary.Read(rand.Reader, binary.BigEndian, &id)
+	query := &Message{
+		ID:    id,
+		Flags: 0x0100,
+		Question: []Question{
+			{
+				Name:  name,
+				Type:  RRTypeTXT,
+				Class: ClassIN,
+			},
+		},
+		Additional: []RR{
+			{
+				Name:  Name{},
+				Type:  RRTypeOPT,
+				Class: 4096,
+				TTL:   0,
+				Data:  []byte{},
+			},
+		},
+	}
+
+	buf, err := query.WireFormat()
+	if err != nil {
+		return nil, err
+	}
+
+	return buf, nil
+}
+
+func chunks(p []byte, n int) [][]byte {
+	var result [][]byte
+	for len(p) > 0 {
+		sz := len(p)
+		if sz > n {
+			sz = n
+		}
+		result = append(result, p[:sz])
+		p = p[sz:]
+	}
+	return result
+}
+
+func nextPacket(r *bytes.Reader) ([]byte, error) {
+	var n uint16
+	err := binary.Read(r, binary.BigEndian, &n)
+	if err != nil {
+		return nil, err
+	}
+	p := make([]byte, n)
+	_, err = io.ReadFull(r, p)
+	if err == io.EOF {
+		err = io.ErrUnexpectedEOF
+	}
+	return p, err
+}
+
+func dnsResponsePayload(resp *Message, domain Name) []byte {
+	if resp.Flags&0x8000 != 0x8000 {
+		return nil
+	}
+	if resp.Flags&0x000f != RcodeNoError {
+		return nil
+	}
+
+	if len(resp.Answer) != 1 {
+		return nil
+	}
+	answer := resp.Answer[0]
+
+	_, ok := answer.Name.TrimSuffix(domain)
+	if !ok {
+		return nil
+	}
+
+	if answer.Type != RRTypeTXT {
+		return nil
+	}
+	payload, err := DecodeRDataTXT(answer.Data)
+	if err != nil {
+		return nil
+	}
+
+	return payload
+}

transport/internet/finalmask/xdns/config.go

@@ -0,0 +1,16 @@
+package xdns
+
+import (
+	"net"
+)
+
+func (c *Config) UDP() {
+}
+
+func (c *Config) WrapPacketConnClient(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error) {
+	return NewConnClient(c, raw, end)
+}
+
+func (c *Config) WrapPacketConnServer(raw net.PacketConn, first bool, leaveSize int32, end bool) (net.PacketConn, error) {
+	return NewConnServer(c, raw, end)
+}

transport/internet/finalmask/xdns/config.pb.go

@@ -0,0 +1,123 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.36.10
+// 	protoc        v6.33.1
+// source: transport/internet/finalmask/xdns/config.proto
+
+package xdns
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+	unsafe "unsafe"
+)
+
+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 Config struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Domain        string                 `protobuf:"bytes,1,opt,name=domain,proto3" json:"domain,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *Config) Reset() {
+	*x = Config{}
+	mi := &file_transport_internet_finalmask_xdns_config_proto_msgTypes[0]
+	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_transport_internet_finalmask_xdns_config_proto_msgTypes[0]
+	if 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_transport_internet_finalmask_xdns_config_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Config) GetDomain() string {
+	if x != nil {
+		return x.Domain
+	}
+	return ""
+}
+
+var File_transport_internet_finalmask_xdns_config_proto protoreflect.FileDescriptor
+
+const file_transport_internet_finalmask_xdns_config_proto_rawDesc = "" +
+	"\n" +
+	".transport/internet/finalmask/xdns/config.proto\x12&xray.transport.internet.finalmask.xdns\" \n" +
+	"\x06Config\x12\x16\n" +
+	"\x06domain\x18\x01 \x01(\tR\x06domainB\x94\x01\n" +
+	"*com.xray.transport.internet.finalmask.xdnsP\x01Z;github.com/xtls/xray-core/transport/internet/finalmask/xdns\xaa\x02&Xray.Transport.Internet.Finalmask.Xdnsb\x06proto3"
+
+var (
+	file_transport_internet_finalmask_xdns_config_proto_rawDescOnce sync.Once
+	file_transport_internet_finalmask_xdns_config_proto_rawDescData []byte
+)
+
+func file_transport_internet_finalmask_xdns_config_proto_rawDescGZIP() []byte {
+	file_transport_internet_finalmask_xdns_config_proto_rawDescOnce.Do(func() {
+		file_transport_internet_finalmask_xdns_config_proto_rawDescData = protoimpl.X.CompressGZIP(unsafe.Slice(unsafe.StringData(file_transport_internet_finalmask_xdns_config_proto_rawDesc), len(file_transport_internet_finalmask_xdns_config_proto_rawDesc)))
+	})
+	return file_transport_internet_finalmask_xdns_config_proto_rawDescData
+}
+
+var file_transport_internet_finalmask_xdns_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_transport_internet_finalmask_xdns_config_proto_goTypes = []any{
+	(*Config)(nil), // 0: xray.transport.internet.finalmask.xdns.Config
+}
+var file_transport_internet_finalmask_xdns_config_proto_depIdxs = []int32{
+	0, // [0:0] is the sub-list for method output_type
+	0, // [0:0] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_transport_internet_finalmask_xdns_config_proto_init() }
+func file_transport_internet_finalmask_xdns_config_proto_init() {
+	if File_transport_internet_finalmask_xdns_config_proto != nil {
+		return
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: unsafe.Slice(unsafe.StringData(file_transport_internet_finalmask_xdns_config_proto_rawDesc), len(file_transport_internet_finalmask_xdns_config_proto_rawDesc)),
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_transport_internet_finalmask_xdns_config_proto_goTypes,
+		DependencyIndexes: file_transport_internet_finalmask_xdns_config_proto_depIdxs,
+		MessageInfos:      file_transport_internet_finalmask_xdns_config_proto_msgTypes,
+	}.Build()
+	File_transport_internet_finalmask_xdns_config_proto = out.File
+	file_transport_internet_finalmask_xdns_config_proto_goTypes = nil
+	file_transport_internet_finalmask_xdns_config_proto_depIdxs = nil
+}

transport/internet/finalmask/xdns/config.proto

@@ -0,0 +1,12 @@
+syntax = "proto3";
+
+package xray.transport.internet.finalmask.xdns;
+option csharp_namespace = "Xray.Transport.Internet.Finalmask.Xdns";
+option go_package = "github.com/xtls/xray-core/transport/internet/finalmask/xdns";
+option java_package = "com.xray.transport.internet.finalmask.xdns";
+option java_multiple_files = true;
+
+message Config {
+  string domain = 1;
+}
+

transport/internet/finalmask/xdns/dns.go

@@ -0,0 +1,575 @@
+// Package dns deals with encoding and decoding DNS wire format.
+package xdns
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+	"strings"
+)
+
+// The maximum number of DNS name compression pointers we are willing to follow.
+// Without something like this, infinite loops are possible.
+const compressionPointerLimit = 10
+
+var (
+	// ErrZeroLengthLabel is the error returned for names that contain a
+	// zero-length label, like "example..com".
+	ErrZeroLengthLabel = errors.New("name contains a zero-length label")
+
+	// ErrLabelTooLong is the error returned for labels that are longer than
+	// 63 octets.
+	ErrLabelTooLong = errors.New("name contains a label longer than 63 octets")
+
+	// ErrNameTooLong is the error returned for names whose encoded
+	// representation is longer than 255 octets.
+	ErrNameTooLong = errors.New("name is longer than 255 octets")
+
+	// ErrReservedLabelType is the error returned when reading a label type
+	// prefix whose two most significant bits are not 00 or 11.
+	ErrReservedLabelType = errors.New("reserved label type")
+
+	// ErrTooManyPointers is the error returned when reading a compressed
+	// name that has too many compression pointers.
+	ErrTooManyPointers = errors.New("too many compression pointers")
+
+	// ErrTrailingBytes is the error returned when bytes remain in the parse
+	// buffer after parsing a message.
+	ErrTrailingBytes = errors.New("trailing bytes after message")
+
+	// ErrIntegerOverflow is the error returned when trying to encode an
+	// integer greater than 65535 into a 16-bit field.
+	ErrIntegerOverflow = errors.New("integer overflow")
+)
+
+const (
+	// https://tools.ietf.org/html/rfc1035#section-3.2.2
+	RRTypeTXT = 16
+	// https://tools.ietf.org/html/rfc6891#section-6.1.1
+	RRTypeOPT = 41
+
+	// https://tools.ietf.org/html/rfc1035#section-3.2.4
+	ClassIN = 1
+
+	// https://tools.ietf.org/html/rfc1035#section-4.1.1
+	RcodeNoError        = 0 // a.k.a. NOERROR
+	RcodeFormatError    = 1 // a.k.a. FORMERR
+	RcodeNameError      = 3 // a.k.a. NXDOMAIN
+	RcodeNotImplemented = 4 // a.k.a. NOTIMPL
+	// https://tools.ietf.org/html/rfc6891#section-9
+	ExtendedRcodeBadVers = 16 // a.k.a. BADVERS
+)
+
+// Name represents a domain name, a sequence of labels each of which is 63
+// octets or less in length.
+//
+// https://tools.ietf.org/html/rfc1035#section-3.1
+type Name [][]byte
+
+// NewName returns a Name from a slice of labels, after checking the labels for
+// validity. Does not include a zero-length label at the end of the slice.
+func NewName(labels [][]byte) (Name, error) {
+	name := Name(labels)
+	// https://tools.ietf.org/html/rfc1035#section-2.3.4
+	// Various objects and parameters in the DNS have size limits.
+	//   labels          63 octets or less
+	//   names           255 octets or less
+	for _, label := range labels {
+		if len(label) == 0 {
+			return nil, ErrZeroLengthLabel
+		}
+		if len(label) > 63 {
+			return nil, ErrLabelTooLong
+		}
+	}
+	// Check the total length.
+	builder := newMessageBuilder()
+	builder.WriteName(name)
+	if len(builder.Bytes()) > 255 {
+		return nil, ErrNameTooLong
+	}
+	return name, nil
+}
+
+// ParseName returns a new Name from a string of labels separated by dots, after
+// checking the name for validity. A single dot at the end of the string is
+// ignored.
+func ParseName(s string) (Name, error) {
+	b := bytes.TrimSuffix([]byte(s), []byte("."))
+	if len(b) == 0 {
+		// bytes.Split(b, ".") would return [""] in this case
+		return NewName([][]byte{})
+	} else {
+		return NewName(bytes.Split(b, []byte(".")))
+	}
+}
+
+// String returns a reversible string representation of name. Labels are
+// separated by dots, and any bytes in a label that are outside the set
+// [0-9A-Za-z-] are replaced with a \xXX hex escape sequence.
+func (name Name) String() string {
+	if len(name) == 0 {
+		return "."
+	}
+
+	var buf strings.Builder
+	for i, label := range name {
+		if i > 0 {
+			buf.WriteByte('.')
+		}
+		for _, b := range label {
+			if b == '-' ||
+				('0' <= b && b <= '9') ||
+				('A' <= b && b <= 'Z') ||
+				('a' <= b && b <= 'z') {
+				buf.WriteByte(b)
+			} else {
+				fmt.Fprintf(&buf, "\\x%02x", b)
+			}
+		}
+	}
+	return buf.String()
+}
+
+// TrimSuffix returns a Name with the given suffix removed, if it was present.
+// The second return value indicates whether the suffix was present. If the
+// suffix was not present, the first return value is nil.
+func (name Name) TrimSuffix(suffix Name) (Name, bool) {
+	if len(name) < len(suffix) {
+		return nil, false
+	}
+	split := len(name) - len(suffix)
+	fore, aft := name[:split], name[split:]
+	for i := 0; i < len(aft); i++ {
+		if !bytes.Equal(bytes.ToLower(aft[i]), bytes.ToLower(suffix[i])) {
+			return nil, false
+		}
+	}
+	return fore, true
+}
+
+// Message represents a DNS message.
+//
+// https://tools.ietf.org/html/rfc1035#section-4.1
+type Message struct {
+	ID    uint16
+	Flags uint16
+
+	Question   []Question
+	Answer     []RR
+	Authority  []RR
+	Additional []RR
+}
+
+// Opcode extracts the OPCODE part of the Flags field.
+//
+// https://tools.ietf.org/html/rfc1035#section-4.1.1
+func (message *Message) Opcode() uint16 {
+	return (message.Flags >> 11) & 0xf
+}
+
+// Rcode extracts the RCODE part of the Flags field.
+//
+// https://tools.ietf.org/html/rfc1035#section-4.1.1
+func (message *Message) Rcode() uint16 {
+	return message.Flags & 0x000f
+}
+
+// Question represents an entry in the question section of a message.
+//
+// https://tools.ietf.org/html/rfc1035#section-4.1.2
+type Question struct {
+	Name  Name
+	Type  uint16
+	Class uint16
+}
+
+// RR represents a resource record.
+//
+// https://tools.ietf.org/html/rfc1035#section-4.1.3
+type RR struct {
+	Name  Name
+	Type  uint16
+	Class uint16
+	TTL   uint32
+	Data  []byte
+}
+
+// readName parses a DNS name from r. It leaves r positioned just after the
+// parsed name.
+func readName(r io.ReadSeeker) (Name, error) {
+	var labels [][]byte
+	// We limit the number of compression pointers we are willing to follow.
+	numPointers := 0
+	// If we followed any compression pointers, we must finally seek to just
+	// past the first pointer.
+	var seekTo int64
+loop:
+	for {
+		var labelType byte
+		err := binary.Read(r, binary.BigEndian, &labelType)
+		if err != nil {
+			return nil, err
+		}
+
+		switch labelType & 0xc0 {
+		case 0x00:
+			// This is an ordinary label.
+			// https://tools.ietf.org/html/rfc1035#section-3.1
+			length := int(labelType & 0x3f)
+			if length == 0 {
+				break loop
+			}
+			label := make([]byte, length)
+			_, err := io.ReadFull(r, label)
+			if err != nil {
+				return nil, err
+			}
+			labels = append(labels, label)
+		case 0xc0:
+			// This is a compression pointer.
+			// https://tools.ietf.org/html/rfc1035#section-4.1.4
+			upper := labelType & 0x3f
+			var lower byte
+			err := binary.Read(r, binary.BigEndian, &lower)
+			if err != nil {
+				return nil, err
+			}
+			offset := (uint16(upper) << 8) | uint16(lower)
+
+			if numPointers == 0 {
+				// The first time we encounter a pointer,
+				// remember our position so we can seek back to
+				// it when done.
+				seekTo, err = r.Seek(0, io.SeekCurrent)
+				if err != nil {
+					return nil, err
+				}
+			}
+			numPointers++
+			if numPointers > compressionPointerLimit {
+				return nil, ErrTooManyPointers
+			}
+
+			// Follow the pointer and continue.
+			_, err = r.Seek(int64(offset), io.SeekStart)
+			if err != nil {
+				return nil, err
+			}
+		default:
+			// "The 10 and 01 combinations are reserved for future
+			// use."
+			return nil, ErrReservedLabelType
+		}
+	}
+	// If we followed any pointers, then seek back to just after the first
+	// one.
+	if numPointers > 0 {
+		_, err := r.Seek(seekTo, io.SeekStart)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return NewName(labels)
+}
+
+// readQuestion parses one entry from the Question section. It leaves r
+// positioned just after the parsed entry.
+//
+// https://tools.ietf.org/html/rfc1035#section-4.1.2
+func readQuestion(r io.ReadSeeker) (Question, error) {
+	var question Question
+	var err error
+	question.Name, err = readName(r)
+	if err != nil {
+		return question, err
+	}
+	for _, ptr := range []*uint16{&question.Type, &question.Class} {
+		err := binary.Read(r, binary.BigEndian, ptr)
+		if err != nil {
+			return question, err
+		}
+	}
+
+	return question, nil
+}
+
+// readRR parses one resource record. It leaves r positioned just after the
+// parsed resource record.
+//
+// https://tools.ietf.org/html/rfc1035#section-4.1.3
+func readRR(r io.ReadSeeker) (RR, error) {
+	var rr RR
+	var err error
+	rr.Name, err = readName(r)
+	if err != nil {
+		return rr, err
+	}
+	for _, ptr := range []*uint16{&rr.Type, &rr.Class} {
+		err := binary.Read(r, binary.BigEndian, ptr)
+		if err != nil {
+			return rr, err
+		}
+	}
+	err = binary.Read(r, binary.BigEndian, &rr.TTL)
+	if err != nil {
+		return rr, err
+	}
+	var rdLength uint16
+	err = binary.Read(r, binary.BigEndian, &rdLength)
+	if err != nil {
+		return rr, err
+	}
+	rr.Data = make([]byte, rdLength)
+	_, err = io.ReadFull(r, rr.Data)
+	if err != nil {
+		return rr, err
+	}
+
+	return rr, nil
+}
+
+// readMessage parses a complete DNS message. It leaves r positioned just after
+// the parsed message.
+func readMessage(r io.ReadSeeker) (Message, error) {
+	var message Message
+
+	// Header section
+	// https://tools.ietf.org/html/rfc1035#section-4.1.1
+	var qdCount, anCount, nsCount, arCount uint16
+	for _, ptr := range []*uint16{
+		&message.ID, &message.Flags,
+		&qdCount, &anCount, &nsCount, &arCount,
+	} {
+		err := binary.Read(r, binary.BigEndian, ptr)
+		if err != nil {
+			return message, err
+		}
+	}
+
+	// Question section
+	// https://tools.ietf.org/html/rfc1035#section-4.1.2
+	for i := 0; i < int(qdCount); i++ {
+		question, err := readQuestion(r)
+		if err != nil {
+			return message, err
+		}
+		message.Question = append(message.Question, question)
+	}
+
+	// Answer, Authority, and Additional sections
+	// https://tools.ietf.org/html/rfc1035#section-4.1.3
+	for _, rec := range []struct {
+		ptr   *[]RR
+		count uint16
+	}{
+		{&message.Answer, anCount},
+		{&message.Authority, nsCount},
+		{&message.Additional, arCount},
+	} {
+		for i := 0; i < int(rec.count); i++ {
+			rr, err := readRR(r)
+			if err != nil {
+				return message, err
+			}
+			*rec.ptr = append(*rec.ptr, rr)
+		}
+	}
+
+	return message, nil
+}
+
+// MessageFromWireFormat parses a message from buf and returns a Message object.
+// It returns ErrTrailingBytes if there are bytes remaining in buf after parsing
+// is done.
+func MessageFromWireFormat(buf []byte) (Message, error) {
+	r := bytes.NewReader(buf)
+	message, err := readMessage(r)
+	if err == io.EOF {
+		err = io.ErrUnexpectedEOF
+	} else if err == nil {
+		// Check for trailing bytes.
+		_, err = r.ReadByte()
+		if err == io.EOF {
+			err = nil
+		} else if err == nil {
+			err = ErrTrailingBytes
+		}
+	}
+	return message, err
+}
+
+// messageBuilder manages the state of serializing a DNS message. Its main
+// function is to keep track of names already written for the purpose of name
+// compression.
+type messageBuilder struct {
+	w         bytes.Buffer
+	nameCache map[string]int
+}
+
+// newMessageBuilder creates a new messageBuilder with an empty name cache.
+func newMessageBuilder() *messageBuilder {
+	return &messageBuilder{
+		nameCache: make(map[string]int),
+	}
+}
+
+// Bytes returns the serialized DNS message as a slice of bytes.
+func (builder *messageBuilder) Bytes() []byte {
+	return builder.w.Bytes()
+}
+
+// WriteName appends name to the in-progress messageBuilder, employing
+// compression pointers to previously written names if possible.
+func (builder *messageBuilder) WriteName(name Name) {
+	// https://tools.ietf.org/html/rfc1035#section-3.1
+	for i := range name {
+		// Has this suffix already been encoded in the message?
+		if ptr, ok := builder.nameCache[name[i:].String()]; ok && ptr&0x3fff == ptr {
+			// If so, we can write a compression pointer.
+			binary.Write(&builder.w, binary.BigEndian, uint16(0xc000|ptr))
+			return
+		}
+		// Not cached; we must encode this label verbatim. Store a cache
+		// entry pointing to the beginning of it.
+		builder.nameCache[name[i:].String()] = builder.w.Len()
+		length := len(name[i])
+		if length == 0 || length > 63 {
+			panic(length)
+		}
+		builder.w.WriteByte(byte(length))
+		builder.w.Write(name[i])
+	}
+	builder.w.WriteByte(0)
+}
+
+// WriteQuestion appends a Question section entry to the in-progress
+// messageBuilder.
+func (builder *messageBuilder) WriteQuestion(question *Question) {
+	// https://tools.ietf.org/html/rfc1035#section-4.1.2
+	builder.WriteName(question.Name)
+	binary.Write(&builder.w, binary.BigEndian, question.Type)
+	binary.Write(&builder.w, binary.BigEndian, question.Class)
+}
+
+// WriteRR appends a resource record to the in-progress messageBuilder. It
+// returns ErrIntegerOverflow if the length of rr.Data does not fit in 16 bits.
+func (builder *messageBuilder) WriteRR(rr *RR) error {
+	// https://tools.ietf.org/html/rfc1035#section-4.1.3
+	builder.WriteName(rr.Name)
+	binary.Write(&builder.w, binary.BigEndian, rr.Type)
+	binary.Write(&builder.w, binary.BigEndian, rr.Class)
+	binary.Write(&builder.w, binary.BigEndian, rr.TTL)
+	rdLength := uint16(len(rr.Data))
+	if int(rdLength) != len(rr.Data) {
+		return ErrIntegerOverflow
+	}
+	binary.Write(&builder.w, binary.BigEndian, rdLength)
+	builder.w.Write(rr.Data)
+	return nil
+}
+
+// WriteMessage appends a complete DNS message to the in-progress
+// messageBuilder. It returns ErrIntegerOverflow if the number of entries in any
+// section, or the length of the data in any resource record, does not fit in 16
+// bits.
+func (builder *messageBuilder) WriteMessage(message *Message) error {
+	// Header section
+	// https://tools.ietf.org/html/rfc1035#section-4.1.1
+	binary.Write(&builder.w, binary.BigEndian, message.ID)
+	binary.Write(&builder.w, binary.BigEndian, message.Flags)
+	for _, count := range []int{
+		len(message.Question),
+		len(message.Answer),
+		len(message.Authority),
+		len(message.Additional),
+	} {
+		count16 := uint16(count)
+		if int(count16) != count {
+			return ErrIntegerOverflow
+		}
+		binary.Write(&builder.w, binary.BigEndian, count16)
+	}
+
+	// Question section
+	// https://tools.ietf.org/html/rfc1035#section-4.1.2
+	for _, question := range message.Question {
+		builder.WriteQuestion(&question)
+	}
+
+	// Answer, Authority, and Additional sections
+	// https://tools.ietf.org/html/rfc1035#section-4.1.3
+	for _, rrs := range [][]RR{message.Answer, message.Authority, message.Additional} {
+		for _, rr := range rrs {
+			err := builder.WriteRR(&rr)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+// WireFormat encodes a Message as a slice of bytes in DNS wire format. It
+// returns ErrIntegerOverflow if the number of entries in any section, or the
+// length of the data in any resource record, does not fit in 16 bits.
+func (message *Message) WireFormat() ([]byte, error) {
+	builder := newMessageBuilder()
+	err := builder.WriteMessage(message)
+	if err != nil {
+		return nil, err
+	}
+	return builder.Bytes(), nil
+}
+
+// DecodeRDataTXT decodes TXT-DATA (as found in the RDATA for a resource record
+// with TYPE=TXT) as a raw byte slice, by concatenating all the
+// <character-string>s it contains.
+//
+// https://tools.ietf.org/html/rfc1035#section-3.3.14
+func DecodeRDataTXT(p []byte) ([]byte, error) {
+	var buf bytes.Buffer
+	for {
+		if len(p) == 0 {
+			return nil, io.ErrUnexpectedEOF
+		}
+		n := int(p[0])
+		p = p[1:]
+		if len(p) < n {
+			return nil, io.ErrUnexpectedEOF
+		}
+		buf.Write(p[:n])
+		p = p[n:]
+		if len(p) == 0 {
+			break
+		}
+	}
+	return buf.Bytes(), nil
+}
+
+// EncodeRDataTXT encodes a slice of bytes as TXT-DATA, as appropriate for the
+// RDATA of a resource record with TYPE=TXT. No length restriction is enforced
+// here; that must be checked at a higher level.
+//
+// https://tools.ietf.org/html/rfc1035#section-3.3.14
+func EncodeRDataTXT(p []byte) []byte {
+	// https://tools.ietf.org/html/rfc1035#section-3.3
+	// https://tools.ietf.org/html/rfc1035#section-3.3.14
+	// TXT data is a sequence of one or more <character-string>s, where
+	// <character-string> is a length octet followed by that number of
+	// octets.
+	var buf bytes.Buffer
+	for len(p) > 255 {
+		buf.WriteByte(255)
+		buf.Write(p[:255])
+		p = p[255:]
+	}
+	// Must write here, even if len(p) == 0, because it's "*one or more*
+	// <character-string>s".
+	buf.WriteByte(byte(len(p)))
+	buf.Write(p)
+	return buf.Bytes()
+}

transport/internet/finalmask/xdns/dns_test.go

@@ -0,0 +1,592 @@
+package xdns
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"strconv"
+	"strings"
+	"testing"
+)
+
+func namesEqual(a, b Name) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	for i := 0; i < len(a); i++ {
+		if !bytes.Equal(a[i], b[i]) {
+			return false
+		}
+	}
+	return true
+}
+
+func TestName(t *testing.T) {
+	for _, test := range []struct {
+		labels [][]byte
+		err    error
+		s      string
+	}{
+		{[][]byte{}, nil, "."},
+		{[][]byte{[]byte("test")}, nil, "test"},
+		{[][]byte{[]byte("a"), []byte("b"), []byte("c")}, nil, "a.b.c"},
+
+		{[][]byte{{}}, ErrZeroLengthLabel, ""},
+		{[][]byte{[]byte("a"), {}, []byte("c")}, ErrZeroLengthLabel, ""},
+
+		// 63 octets.
+		{[][]byte{[]byte("0123456789abcdef0123456789ABCDEF0123456789abcdef0123456789ABCDE")}, nil,
+			"0123456789abcdef0123456789ABCDEF0123456789abcdef0123456789ABCDE"},
+		// 64 octets.
+		{[][]byte{[]byte("0123456789abcdef0123456789ABCDEF0123456789abcdef0123456789ABCDEF")}, ErrLabelTooLong, ""},
+
+		// 64+64+64+62 octets.
+		{[][]byte{
+			[]byte("0123456789abcdef0123456789ABCDEF0123456789abcdef0123456789ABCDE"),
+			[]byte("0123456789abcdef0123456789ABCDEF0123456789abcdef0123456789ABCDE"),
+			[]byte("0123456789abcdef0123456789ABCDEF0123456789abcdef0123456789ABCDE"),
+			[]byte("0123456789abcdef0123456789ABCDEF0123456789abcdef0123456789ABC"),
+		}, nil,
+			"0123456789abcdef0123456789ABCDEF0123456789abcdef0123456789ABCDE.0123456789abcdef0123456789ABCDEF0123456789abcdef0123456789ABCDE.0123456789abcdef0123456789ABCDEF0123456789abcdef0123456789ABCDE.0123456789abcdef0123456789ABCDEF0123456789abcdef0123456789ABC"},
+		// 64+64+64+63 octets.
+		{[][]byte{
+			[]byte("0123456789abcdef0123456789ABCDEF0123456789abcdef0123456789ABCDE"),
+			[]byte("0123456789abcdef0123456789ABCDEF0123456789abcdef0123456789ABCDE"),
+			[]byte("0123456789abcdef0123456789ABCDEF0123456789abcdef0123456789ABCDE"),
+			[]byte("0123456789abcdef0123456789ABCDEF0123456789abcdef0123456789ABCD"),
+		}, ErrNameTooLong, ""},
+		// 127 one-octet labels.
+		{[][]byte{
+			{'0'}, {'1'}, {'2'}, {'3'}, {'4'}, {'5'}, {'6'}, {'7'}, {'8'}, {'9'}, {'a'}, {'b'}, {'c'}, {'d'}, {'e'}, {'f'},
+			{'0'}, {'1'}, {'2'}, {'3'}, {'4'}, {'5'}, {'6'}, {'7'}, {'8'}, {'9'}, {'A'}, {'B'}, {'C'}, {'D'}, {'E'}, {'F'},
+			{'0'}, {'1'}, {'2'}, {'3'}, {'4'}, {'5'}, {'6'}, {'7'}, {'8'}, {'9'}, {'a'}, {'b'}, {'c'}, {'d'}, {'e'}, {'f'},
+			{'0'}, {'1'}, {'2'}, {'3'}, {'4'}, {'5'}, {'6'}, {'7'}, {'8'}, {'9'}, {'A'}, {'B'}, {'C'}, {'D'}, {'E'}, {'F'},
+			{'0'}, {'1'}, {'2'}, {'3'}, {'4'}, {'5'}, {'6'}, {'7'}, {'8'}, {'9'}, {'a'}, {'b'}, {'c'}, {'d'}, {'e'}, {'f'},
+			{'0'}, {'1'}, {'2'}, {'3'}, {'4'}, {'5'}, {'6'}, {'7'}, {'8'}, {'9'}, {'A'}, {'B'}, {'C'}, {'D'}, {'E'}, {'F'},
+			{'0'}, {'1'}, {'2'}, {'3'}, {'4'}, {'5'}, {'6'}, {'7'}, {'8'}, {'9'}, {'a'}, {'b'}, {'c'}, {'d'}, {'e'}, {'f'},
+			{'0'}, {'1'}, {'2'}, {'3'}, {'4'}, {'5'}, {'6'}, {'7'}, {'8'}, {'9'}, {'A'}, {'B'}, {'C'}, {'D'}, {'E'},
+		}, nil,
+			"0.1.2.3.4.5.6.7.8.9.a.b.c.d.e.f.0.1.2.3.4.5.6.7.8.9.A.B.C.D.E.F.0.1.2.3.4.5.6.7.8.9.a.b.c.d.e.f.0.1.2.3.4.5.6.7.8.9.A.B.C.D.E.F.0.1.2.3.4.5.6.7.8.9.a.b.c.d.e.f.0.1.2.3.4.5.6.7.8.9.A.B.C.D.E.F.0.1.2.3.4.5.6.7.8.9.a.b.c.d.e.f.0.1.2.3.4.5.6.7.8.9.A.B.C.D.E"},
+		// 128 one-octet labels.
+		{[][]byte{
+			{'0'}, {'1'}, {'2'}, {'3'}, {'4'}, {'5'}, {'6'}, {'7'}, {'8'}, {'9'}, {'a'}, {'b'}, {'c'}, {'d'}, {'e'}, {'f'},
+			{'0'}, {'1'}, {'2'}, {'3'}, {'4'}, {'5'}, {'6'}, {'7'}, {'8'}, {'9'}, {'A'}, {'B'}, {'C'}, {'D'}, {'E'}, {'F'},
+			{'0'}, {'1'}, {'2'}, {'3'}, {'4'}, {'5'}, {'6'}, {'7'}, {'8'}, {'9'}, {'a'}, {'b'}, {'c'}, {'d'}, {'e'}, {'f'},
+			{'0'}, {'1'}, {'2'}, {'3'}, {'4'}, {'5'}, {'6'}, {'7'}, {'8'}, {'9'}, {'A'}, {'B'}, {'C'}, {'D'}, {'E'}, {'F'},
+			{'0'}, {'1'}, {'2'}, {'3'}, {'4'}, {'5'}, {'6'}, {'7'}, {'8'}, {'9'}, {'a'}, {'b'}, {'c'}, {'d'}, {'e'}, {'f'},
+			{'0'}, {'1'}, {'2'}, {'3'}, {'4'}, {'5'}, {'6'}, {'7'}, {'8'}, {'9'}, {'A'}, {'B'}, {'C'}, {'D'}, {'E'}, {'F'},
+			{'0'}, {'1'}, {'2'}, {'3'}, {'4'}, {'5'}, {'6'}, {'7'}, {'8'}, {'9'}, {'a'}, {'b'}, {'c'}, {'d'}, {'e'}, {'f'},
+			{'0'}, {'1'}, {'2'}, {'3'}, {'4'}, {'5'}, {'6'}, {'7'}, {'8'}, {'9'}, {'A'}, {'B'}, {'C'}, {'D'}, {'E'}, {'F'},
+		}, ErrNameTooLong, ""},
+	} {
+		// Test that NewName returns proper error codes, and otherwise
+		// returns an equal slice of labels.
+		name, err := NewName(test.labels)
+		if err != test.err || (err == nil && !namesEqual(name, test.labels)) {
+			t.Errorf("%+q returned (%+q, %v), expected (%+q, %v)",
+				test.labels, name, err, test.labels, test.err)
+			continue
+		}
+		if test.err != nil {
+			continue
+		}
+
+		// Test that the string version of the name comes out as
+		// expected.
+		s := name.String()
+		if s != test.s {
+			t.Errorf("%+q became string %+q, expected %+q", test.labels, s, test.s)
+			continue
+		}
+
+		// Test that parsing from a string back to a Name results in the
+		// original slice of labels.
+		name, err = ParseName(s)
+		if err != nil || !namesEqual(name, test.labels) {
+			t.Errorf("%+q parsing %+q returned (%+q, %v), expected (%+q, %v)",
+				test.labels, s, name, err, test.labels, nil)
+			continue
+		}
+		// A trailing dot should be ignored.
+		if !strings.HasSuffix(s, ".") {
+			dotName, dotErr := ParseName(s + ".")
+			if dotErr != err || !namesEqual(dotName, name) {
+				t.Errorf("%+q parsing %+q returned (%+q, %v), expected (%+q, %v)",
+					test.labels, s+".", dotName, dotErr, name, err)
+				continue
+			}
+		}
+	}
+}
+
+func TestParseName(t *testing.T) {
+	for _, test := range []struct {
+		s    string
+		name Name
+		err  error
+	}{
+		// This case can't be tested by TestName above because String
+		// will never produce "" (it produces "." instead).
+		{"", [][]byte{}, nil},
+	} {
+		name, err := ParseName(test.s)
+		if err != test.err || (err == nil && !namesEqual(name, test.name)) {
+			t.Errorf("%+q returned (%+q, %v), expected (%+q, %v)",
+				test.s, name, err, test.name, test.err)
+			continue
+		}
+	}
+}
+
+func unescapeString(s string) ([][]byte, error) {
+	if s == "." {
+		return [][]byte{}, nil
+	}
+
+	var result [][]byte
+	for _, label := range strings.Split(s, ".") {
+		var buf bytes.Buffer
+		i := 0
+		for i < len(label) {
+			switch label[i] {
+			case '\\':
+				if i+3 >= len(label) {
+					return nil, fmt.Errorf("truncated escape sequence at index %v", i)
+				}
+				if label[i+1] != 'x' {
+					return nil, fmt.Errorf("malformed escape sequence at index %v", i)
+				}
+				b, err := strconv.ParseUint(string(label[i+2:i+4]), 16, 8)
+				if err != nil {
+					return nil, fmt.Errorf("malformed hex sequence at index %v", i+2)
+				}
+				buf.WriteByte(byte(b))
+				i += 4
+			default:
+				buf.WriteByte(label[i])
+				i++
+			}
+		}
+		result = append(result, buf.Bytes())
+	}
+	return result, nil
+}
+
+func TestNameString(t *testing.T) {
+	for _, test := range []struct {
+		name Name
+		s    string
+	}{
+		{[][]byte{}, "."},
+		{[][]byte{[]byte("\x00"), []byte("a.b"), []byte("c\nd\\")}, "\\x00.a\\x2eb.c\\x0ad\\x5c"},
+		{[][]byte{
+			[]byte("\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f !\"#$%&'()*+,-./0123456789:;<=>"),
+			[]byte("?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}"),
+			[]byte("~\x7f\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc"),
+			[]byte("\xbd\xbe\xbf\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb"),
+			[]byte("\xfc\xfd\xfe\xff"),
+		}, "\\x00\\x01\\x02\\x03\\x04\\x05\\x06\\x07\\x08\\x09\\x0a\\x0b\\x0c\\x0d\\x0e\\x0f\\x10\\x11\\x12\\x13\\x14\\x15\\x16\\x17\\x18\\x19\\x1a\\x1b\\x1c\\x1d\\x1e\\x1f\\x20\\x21\\x22\\x23\\x24\\x25\\x26\\x27\\x28\\x29\\x2a\\x2b\\x2c-\\x2e\\x2f0123456789\\x3a\\x3b\\x3c\\x3d\\x3e.\\x3f\\x40ABCDEFGHIJKLMNOPQRSTUVWXYZ\\x5b\\x5c\\x5d\\x5e\\x5f\\x60abcdefghijklmnopqrstuvwxyz\\x7b\\x7c\\x7d.\\x7e\\x7f\\x80\\x81\\x82\\x83\\x84\\x85\\x86\\x87\\x88\\x89\\x8a\\x8b\\x8c\\x8d\\x8e\\x8f\\x90\\x91\\x92\\x93\\x94\\x95\\x96\\x97\\x98\\x99\\x9a\\x9b\\x9c\\x9d\\x9e\\x9f\\xa0\\xa1\\xa2\\xa3\\xa4\\xa5\\xa6\\xa7\\xa8\\xa9\\xaa\\xab\\xac\\xad\\xae\\xaf\\xb0\\xb1\\xb2\\xb3\\xb4\\xb5\\xb6\\xb7\\xb8\\xb9\\xba\\xbb\\xbc.\\xbd\\xbe\\xbf\\xc0\\xc1\\xc2\\xc3\\xc4\\xc5\\xc6\\xc7\\xc8\\xc9\\xca\\xcb\\xcc\\xcd\\xce\\xcf\\xd0\\xd1\\xd2\\xd3\\xd4\\xd5\\xd6\\xd7\\xd8\\xd9\\xda\\xdb\\xdc\\xdd\\xde\\xdf\\xe0\\xe1\\xe2\\xe3\\xe4\\xe5\\xe6\\xe7\\xe8\\xe9\\xea\\xeb\\xec\\xed\\xee\\xef\\xf0\\xf1\\xf2\\xf3\\xf4\\xf5\\xf6\\xf7\\xf8\\xf9\\xfa\\xfb.\\xfc\\xfd\\xfe\\xff"},
+	} {
+		s := test.name.String()
+		if s != test.s {
+			t.Errorf("%+q escaped to %+q, expected %+q", test.name, s, test.s)
+			continue
+		}
+		unescaped, err := unescapeString(s)
+		if err != nil {
+			t.Errorf("%+q unescaping %+q resulted in error %v", test.name, s, err)
+			continue
+		}
+		if !namesEqual(Name(unescaped), test.name) {
+			t.Errorf("%+q roundtripped through %+q to %+q", test.name, s, unescaped)
+			continue
+		}
+	}
+}
+
+func TestNameTrimSuffix(t *testing.T) {
+	for _, test := range []struct {
+		name, suffix string
+		trimmed      string
+		ok           bool
+	}{
+		{"", "", ".", true},
+		{".", ".", ".", true},
+		{"abc", "", "abc", true},
+		{"abc", ".", "abc", true},
+		{"", "abc", ".", false},
+		{".", "abc", ".", false},
+		{"example.com", "com", "example", true},
+		{"example.com", "net", ".", false},
+		{"example.com", "example.com", ".", true},
+		{"example.com", "test.com", ".", false},
+		{"example.com", "xample.com", ".", false},
+		{"example.com", "example", ".", false},
+		{"example.com", "COM", "example", true},
+		{"EXAMPLE.COM", "com", "EXAMPLE", true},
+	} {
+		tmp, ok := mustParseName(test.name).TrimSuffix(mustParseName(test.suffix))
+		trimmed := tmp.String()
+		if ok != test.ok || trimmed != test.trimmed {
+			t.Errorf("TrimSuffix %+q %+q returned (%+q, %v), expected (%+q, %v)",
+				test.name, test.suffix, trimmed, ok, test.trimmed, test.ok)
+			continue
+		}
+	}
+}
+
+func TestReadName(t *testing.T) {
+	// Good tests.
+	for _, test := range []struct {
+		start int64
+		end   int64
+		input string
+		s     string
+	}{
+		// Empty name.
+		{0, 1, "\x00abcd", "."},
+		// No pointers.
+		{12, 25, "AAAABBBBCCCC\x07example\x03com\x00", "example.com"},
+		// Backward pointer.
+		{25, 31, "AAAABBBBCCCC\x07example\x03com\x00\x03sub\xc0\x0c", "sub.example.com"},
+		// Forward pointer.
+		{0, 4, "\x01a\xc0\x04\x03bcd\x00", "a.bcd"},
+		// Two backwards pointers.
+		{31, 38, "AAAABBBBCCCC\x07example\x03com\x00\x03sub\xc0\x0c\x04sub2\xc0\x19", "sub2.sub.example.com"},
+		// Forward then backward pointer.
+		{25, 31, "AAAABBBBCCCC\x07example\x03com\x00\x03sub\xc0\x1f\x04sub2\xc0\x0c", "sub.sub2.example.com"},
+		// Overlapping codons.
+		{0, 4, "\x01a\xc0\x03bcd\x00", "a.bcd"},
+		// Pointer to empty label.
+		{0, 10, "\x07example\xc0\x0a\x00", "example"},
+		{1, 11, "\x00\x07example\xc0\x00", "example"},
+		// Pointer to pointer to empty label.
+		{0, 10, "\x07example\xc0\x0a\xc0\x0c\x00", "example"},
+		{1, 11, "\x00\x07example\xc0\x0c\xc0\x00", "example"},
+	} {
+		r := bytes.NewReader([]byte(test.input))
+		_, err := r.Seek(test.start, io.SeekStart)
+		if err != nil {
+			panic(err)
+		}
+		name, err := readName(r)
+		if err != nil {
+			t.Errorf("%+q returned error %s", test.input, err)
+			continue
+		}
+		s := name.String()
+		if s != test.s {
+			t.Errorf("%+q returned %+q, expected %+q", test.input, s, test.s)
+			continue
+		}
+		cur, _ := r.Seek(0, io.SeekCurrent)
+		if cur != test.end {
+			t.Errorf("%+q left offset %d, expected %d", test.input, cur, test.end)
+			continue
+		}
+	}
+
+	// Bad tests.
+	for _, test := range []struct {
+		start int64
+		input string
+		err   error
+	}{
+		{0, "", io.ErrUnexpectedEOF},
+		// Reserved label type.
+		{0, "\x80example", ErrReservedLabelType},
+		// Reserved label type.
+		{0, "\x40example", ErrReservedLabelType},
+		// No Terminating empty label.
+		{0, "\x07example\x03com", io.ErrUnexpectedEOF},
+		// Pointer past end of buffer.
+		{0, "\x07example\xc0\xff", io.ErrUnexpectedEOF},
+		// Pointer to self.
+		{0, "\x07example\x03com\xc0\x0c", ErrTooManyPointers},
+		// Pointer to self with intermediate label.
+		{0, "\x07example\x03com\xc0\x08", ErrTooManyPointers},
+		// Two pointers that point to each other.
+		{0, "\xc0\x02\xc0\x00", ErrTooManyPointers},
+		// Two pointers that point to each other, with intermediate labels.
+		{0, "\x01a\xc0\x04\x01b\xc0\x00", ErrTooManyPointers},
+		// EOF while reading label.
+		{0, "\x0aexample", io.ErrUnexpectedEOF},
+		// EOF before second byte of pointer.
+		{0, "\xc0", io.ErrUnexpectedEOF},
+		{0, "\x07example\xc0", io.ErrUnexpectedEOF},
+	} {
+		r := bytes.NewReader([]byte(test.input))
+		_, err := r.Seek(test.start, io.SeekStart)
+		if err != nil {
+			panic(err)
+		}
+		name, err := readName(r)
+		if err == io.EOF {
+			err = io.ErrUnexpectedEOF
+		}
+		if err != test.err {
+			t.Errorf("%+q returned (%+q, %v), expected %v", test.input, name, err, test.err)
+			continue
+		}
+	}
+}
+
+func mustParseName(s string) Name {
+	name, err := ParseName(s)
+	if err != nil {
+		panic(err)
+	}
+	return name
+}
+
+func questionsEqual(a, b *Question) bool {
+	if !namesEqual(a.Name, b.Name) {
+		return false
+	}
+	if a.Type != b.Type || a.Class != b.Class {
+		return false
+	}
+	return true
+}
+
+func rrsEqual(a, b *RR) bool {
+	if !namesEqual(a.Name, b.Name) {
+		return false
+	}
+	if a.Type != b.Type || a.Class != b.Class || a.TTL != b.TTL {
+		return false
+	}
+	if !bytes.Equal(a.Data, b.Data) {
+		return false
+	}
+	return true
+}
+
+func messagesEqual(a, b *Message) bool {
+	if a.ID != b.ID || a.Flags != b.Flags {
+		return false
+	}
+	if len(a.Question) != len(b.Question) {
+		return false
+	}
+	for i := 0; i < len(a.Question); i++ {
+		if !questionsEqual(&a.Question[i], &b.Question[i]) {
+			return false
+		}
+	}
+	for _, rec := range []struct{ rrA, rrB []RR }{
+		{a.Answer, b.Answer},
+		{a.Authority, b.Authority},
+		{a.Additional, b.Additional},
+	} {
+		if len(rec.rrA) != len(rec.rrB) {
+			return false
+		}
+		for i := 0; i < len(rec.rrA); i++ {
+			if !rrsEqual(&rec.rrA[i], &rec.rrB[i]) {
+				return false
+			}
+		}
+	}
+	return true
+}
+
+func TestMessageFromWireFormat(t *testing.T) {
+	for _, test := range []struct {
+		buf      string
+		expected Message
+		err      error
+	}{
+		{
+			"\x12\x34",
+			Message{},
+			io.ErrUnexpectedEOF,
+		},
+		{
+			"\x12\x34\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x03www\x07example\x03com\x00\x00\x01\x00\x01",
+			Message{
+				ID:    0x1234,
+				Flags: 0x0100,
+				Question: []Question{
+					{
+						Name:  mustParseName("www.example.com"),
+						Type:  1,
+						Class: 1,
+					},
+				},
+				Answer:     []RR{},
+				Authority:  []RR{},
+				Additional: []RR{},
+			},
+			nil,
+		},
+		{
+			"\x12\x34\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x03www\x07example\x03com\x00\x00\x01\x00\x01X",
+			Message{},
+			ErrTrailingBytes,
+		},
+		{
+			"\x12\x34\x81\x80\x00\x01\x00\x01\x00\x00\x00\x00\x03www\x07example\x03com\x00\x00\x01\x00\x01\x03www\x07example\x03com\x00\x00\x01\x00\x01\x00\x00\x00\x80\x00\x04\xc0\x00\x02\x01",
+			Message{
+				ID:    0x1234,
+				Flags: 0x8180,
+				Question: []Question{
+					{
+						Name:  mustParseName("www.example.com"),
+						Type:  1,
+						Class: 1,
+					},
+				},
+				Answer: []RR{
+					{
+						Name:  mustParseName("www.example.com"),
+						Type:  1,
+						Class: 1,
+						TTL:   128,
+						Data:  []byte{192, 0, 2, 1},
+					},
+				},
+				Authority:  []RR{},
+				Additional: []RR{},
+			},
+			nil,
+		},
+	} {
+		message, err := MessageFromWireFormat([]byte(test.buf))
+		if err != test.err || (err == nil && !messagesEqual(&message, &test.expected)) {
+			t.Errorf("%+q\nreturned (%+v, %v)\nexpected (%+v, %v)",
+				test.buf, message, err, test.expected, test.err)
+			continue
+		}
+	}
+}
+
+func TestMessageWireFormatRoundTrip(t *testing.T) {
+	for _, message := range []Message{
+		{
+			ID:    0x1234,
+			Flags: 0x0100,
+			Question: []Question{
+				{
+					Name:  mustParseName("www.example.com"),
+					Type:  1,
+					Class: 1,
+				},
+				{
+					Name:  mustParseName("www2.example.com"),
+					Type:  2,
+					Class: 2,
+				},
+			},
+			Answer: []RR{
+				{
+					Name:  mustParseName("abc"),
+					Type:  2,
+					Class: 3,
+					TTL:   0xffffffff,
+					Data:  []byte{1},
+				},
+				{
+					Name:  mustParseName("xyz"),
+					Type:  2,
+					Class: 3,
+					TTL:   255,
+					Data:  []byte{},
+				},
+			},
+			Authority: []RR{
+				{
+					Name:  mustParseName("."),
+					Type:  65535,
+					Class: 65535,
+					TTL:   0,
+					Data:  []byte("XXXXXXXXXXXXXXXXXXX"),
+				},
+			},
+			Additional: []RR{},
+		},
+	} {
+		buf, err := message.WireFormat()
+		if err != nil {
+			t.Errorf("%+v cannot make wire format: %v", message, err)
+			continue
+		}
+		message2, err := MessageFromWireFormat(buf)
+		if err != nil {
+			t.Errorf("%+q cannot parse wire format: %v", buf, err)
+			continue
+		}
+		if !messagesEqual(&message, &message2) {
+			t.Errorf("messages unequal\nbefore: %+v\n after: %+v", message, message2)
+			continue
+		}
+	}
+}
+
+func TestDecodeRDataTXT(t *testing.T) {
+	for _, test := range []struct {
+		p       []byte
+		decoded []byte
+		err     error
+	}{
+		{[]byte{}, nil, io.ErrUnexpectedEOF},
+		{[]byte("\x00"), []byte{}, nil},
+		{[]byte("\x01"), nil, io.ErrUnexpectedEOF},
+	} {
+		decoded, err := DecodeRDataTXT(test.p)
+		if err != test.err || (err == nil && !bytes.Equal(decoded, test.decoded)) {
+			t.Errorf("%+q\nreturned (%+q, %v)\nexpected (%+q, %v)",
+				test.p, decoded, err, test.decoded, test.err)
+			continue
+		}
+	}
+}
+
+func TestEncodeRDataTXT(t *testing.T) {
+	// Encoding 0 bytes needs to return at least a single length octet of
+	// zero, not an empty slice.
+	p := make([]byte, 0)
+	encoded := EncodeRDataTXT(p)
+	if len(encoded) < 0 {
+		t.Errorf("EncodeRDataTXT(%v) returned %v", p, encoded)
+	}
+
+	// 255 bytes should be able to be encoded into 256 bytes.
+	p = make([]byte, 255)
+	encoded = EncodeRDataTXT(p)
+	if len(encoded) > 256 {
+		t.Errorf("EncodeRDataTXT(%d bytes) returned %d bytes", len(p), len(encoded))
+	}
+}
+
+func TestRDataTXTRoundTrip(t *testing.T) {
+	for _, p := range [][]byte{
+		{},
+		[]byte("\x00"),
+		{
+			0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+			0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
+			0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
+			0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
+			0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
+			0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
+			0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
+			0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
+			0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
+			0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
+			0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
+			0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
+			0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
+			0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
+			0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
+			0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff,
+		},
+	} {
+		rdata := EncodeRDataTXT(p)
+		decoded, err := DecodeRDataTXT(rdata)
+		if err != nil || !bytes.Equal(decoded, p) {
+			t.Errorf("%+q returned (%+q, %v)", p, decoded, err)
+			continue
+		}
+	}
+}

transport/internet/finalmask/xdns/server.go

@@ -0,0 +1,567 @@
+package xdns
+
+import (
+	"bytes"
+	"context"
+	"encoding/binary"
+	"io"
+	"net"
+	"sync"
+	"time"
+
+	"github.com/xtls/xray-core/common/errors"
+)
+
+const (
+	idleTimeout      = 2 * time.Minute
+	responseTTL      = 60
+	maxResponseDelay = 1 * time.Second
+)
+
+var (
+	maxUDPPayload     = 1280 - 40 - 8
+	maxEncodedPayload = computeMaxEncodedPayload(maxUDPPayload)
+)
+
+func clientIDToAddr(clientID [8]byte) *net.UDPAddr {
+	ip := make(net.IP, 16)
+
+	copy(ip, []byte{0xfd, 0x00, 0, 0, 0, 0, 0, 0})
+	copy(ip[8:], clientID[:])
+
+	return &net.UDPAddr{
+		IP: ip,
+	}
+}
+
+type record struct {
+	Resp *Message
+	Addr net.Addr
+	// ClientID [8]byte
+	ClientAddr net.Addr
+}
+
+type queue struct {
+	lash  time.Time
+	queue chan []byte
+	stash chan []byte
+}
+
+type xdnsConnServer struct {
+	conn net.PacketConn
+
+	domain Name
+
+	ch            chan *record
+	readQueue     chan *packet
+	writeQueueMap map[string]*queue
+
+	closed bool
+	mutex  sync.Mutex
+}
+
+func NewConnServer(c *Config, raw net.PacketConn, end bool) (net.PacketConn, error) {
+	if !end {
+		return nil, errors.New("xdns requires being at the outermost level")
+	}
+
+	domain, err := ParseName(c.Domain)
+	if err != nil {
+		return nil, err
+	}
+
+	conn := &xdnsConnServer{
+		conn: raw,
+
+		domain: domain,
+
+		ch:            make(chan *record, 100),
+		readQueue:     make(chan *packet, 128),
+		writeQueueMap: make(map[string]*queue),
+	}
+
+	go conn.clean()
+	go conn.recvLoop()
+	go conn.sendLoop()
+
+	return conn, nil
+}
+
+func (c *xdnsConnServer) clean() {
+	f := func() bool {
+		c.mutex.Lock()
+		defer c.mutex.Unlock()
+
+		if c.closed {
+			return true
+		}
+
+		now := time.Now()
+
+		for key, q := range c.writeQueueMap {
+			if now.Sub(q.lash) >= idleTimeout {
+				close(q.queue)
+				close(q.stash)
+				delete(c.writeQueueMap, key)
+			}
+		}
+
+		return false
+	}
+
+	for {
+		time.Sleep(idleTimeout / 2)
+		if f() {
+			return
+		}
+	}
+}
+
+func (c *xdnsConnServer) ensureQueue(addr net.Addr) *queue {
+	c.mutex.Lock()
+	defer c.mutex.Unlock()
+
+	if c.closed {
+		return nil
+	}
+
+	q, ok := c.writeQueueMap[addr.String()]
+	if !ok {
+		q = &queue{
+			queue: make(chan []byte, 128),
+			stash: make(chan []byte, 1),
+		}
+		c.writeQueueMap[addr.String()] = q
+	}
+	q.lash = time.Now()
+
+	return q
+}
+
+func (c *xdnsConnServer) stash(queue *queue, p []byte) {
+	c.mutex.Lock()
+	defer c.mutex.Unlock()
+
+	if c.closed {
+		return
+	}
+
+	select {
+	case queue.stash <- p:
+	default:
+	}
+}
+
+func (c *xdnsConnServer) recvLoop() {
+	for {
+		if c.closed {
+			break
+		}
+
+		var buf [4096]byte
+		n, addr, err := c.conn.ReadFrom(buf[:])
+		if err != nil {
+			continue
+		}
+
+		query, err := MessageFromWireFormat(buf[:n])
+		if err != nil {
+			continue
+		}
+
+		resp, payload := responseFor(&query, c.domain)
+
+		var clientID [8]byte
+		n = copy(clientID[:], payload)
+		payload = payload[n:]
+		if n == len(clientID) {
+			r := bytes.NewReader(payload)
+			for {
+				p, err := nextPacketServer(r)
+				if err != nil {
+					break
+				}
+
+				buf := make([]byte, len(p))
+				copy(buf, p)
+				select {
+				case c.readQueue <- &packet{
+					p:    buf,
+					addr: clientIDToAddr(clientID),
+				}:
+				default:
+				}
+			}
+		} else {
+			if resp != nil && resp.Rcode() == RcodeNoError {
+				resp.Flags |= RcodeNameError
+			}
+		}
+
+		if resp != nil {
+			select {
+			case c.ch <- &record{resp, addr, clientIDToAddr(clientID)}:
+			default:
+			}
+		}
+	}
+
+	close(c.ch)
+	close(c.readQueue)
+}
+
+func (c *xdnsConnServer) sendLoop() {
+	var nextRec *record
+	for {
+		rec := nextRec
+		nextRec = nil
+
+		if rec == nil {
+			var ok bool
+			rec, ok = <-c.ch
+			if !ok {
+				break
+			}
+		}
+
+		if rec.Resp.Rcode() == RcodeNoError && len(rec.Resp.Question) == 1 {
+			rec.Resp.Answer = []RR{
+				{
+					Name:  rec.Resp.Question[0].Name,
+					Type:  rec.Resp.Question[0].Type,
+					Class: rec.Resp.Question[0].Class,
+					TTL:   responseTTL,
+					Data:  nil,
+				},
+			}
+
+			var payload bytes.Buffer
+			limit := maxEncodedPayload
+			timer := time.NewTimer(maxResponseDelay)
+			for {
+				queue := c.ensureQueue(rec.ClientAddr)
+				if queue == nil {
+					return
+				}
+
+				var p []byte
+
+				select {
+				case p = <-queue.stash:
+				default:
+					select {
+					case p = <-queue.stash:
+					case p = <-queue.queue:
+					default:
+						select {
+						case p = <-queue.stash:
+						case p = <-queue.queue:
+						case <-timer.C:
+						case nextRec = <-c.ch:
+						}
+					}
+				}
+
+				timer.Reset(0)
+
+				if len(p) == 0 {
+					break
+				}
+
+				limit -= 2 + len(p)
+				if payload.Len() == 0 {
+
+				} else if limit < 0 {
+					c.stash(queue, p)
+
+					break
+				}
+
+				if int(uint16(len(p))) != len(p) {
+					panic(len(p))
+				}
+
+				_ = binary.Write(&payload, binary.BigEndian, uint16(len(p)))
+				payload.Write(p)
+			}
+			timer.Stop()
+
+			rec.Resp.Answer[0].Data = EncodeRDataTXT(payload.Bytes())
+		}
+
+		buf, err := rec.Resp.WireFormat()
+		if err != nil {
+			continue
+		}
+
+		if len(buf) > maxUDPPayload {
+			errors.LogDebug(context.Background(), "xdns server truncate ", len(buf))
+			buf = buf[:maxUDPPayload]
+			buf[2] |= 0x02
+		}
+
+		if c.closed {
+			return
+		}
+
+		_, _ = c.conn.WriteTo(buf, rec.Addr)
+	}
+}
+
+func (c *xdnsConnServer) Size() int32 {
+	return 0
+}
+
+func (c *xdnsConnServer) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
+	packet, ok := <-c.readQueue
+	if !ok {
+		return 0, nil, io.EOF
+	}
+	n = copy(p, packet.p)
+	if n != len(packet.p) {
+		return 0, nil, io.ErrShortBuffer
+	}
+	return n, packet.addr, nil
+}
+
+func (c *xdnsConnServer) WriteTo(p []byte, addr net.Addr) (n int, err error) {
+	q := c.ensureQueue(addr)
+	if q == nil {
+		return 0, errors.New("xdns closed")
+	}
+
+	c.mutex.Lock()
+	defer c.mutex.Unlock()
+
+	if c.closed {
+		return 0, errors.New("xdns closed")
+	}
+
+	buf := make([]byte, len(p))
+	copy(buf, p)
+
+	select {
+	case q.queue <- buf:
+		return len(p), nil
+	default:
+		return 0, errors.New("xdns queue full")
+	}
+}
+
+func (c *xdnsConnServer) Close() error {
+	c.mutex.Lock()
+	defer c.mutex.Unlock()
+
+	if c.closed {
+		return nil
+	}
+
+	c.closed = true
+	for key, q := range c.writeQueueMap {
+		close(q.queue)
+		close(q.stash)
+		delete(c.writeQueueMap, key)
+	}
+
+	return c.conn.Close()
+}
+
+func (c *xdnsConnServer) LocalAddr() net.Addr {
+	return c.conn.LocalAddr()
+}
+
+func (c *xdnsConnServer) SetDeadline(t time.Time) error {
+	return c.conn.SetDeadline(t)
+}
+
+func (c *xdnsConnServer) SetReadDeadline(t time.Time) error {
+	return c.conn.SetReadDeadline(t)
+}
+
+func (c *xdnsConnServer) SetWriteDeadline(t time.Time) error {
+	return c.conn.SetWriteDeadline(t)
+}
+
+func nextPacketServer(r *bytes.Reader) ([]byte, error) {
+	eof := func(err error) error {
+		if err == io.EOF {
+			err = io.ErrUnexpectedEOF
+		}
+		return err
+	}
+
+	for {
+		prefix, err := r.ReadByte()
+		if err != nil {
+			return nil, err
+		}
+		if prefix >= 224 {
+			paddingLen := prefix - 224
+			_, err := io.CopyN(io.Discard, r, int64(paddingLen))
+			if err != nil {
+				return nil, eof(err)
+			}
+		} else {
+			p := make([]byte, int(prefix))
+			_, err = io.ReadFull(r, p)
+			return p, eof(err)
+		}
+	}
+}
+
+func responseFor(query *Message, domain Name) (*Message, []byte) {
+	resp := &Message{
+		ID:       query.ID,
+		Flags:    0x8000,
+		Question: query.Question,
+	}
+
+	if query.Flags&0x8000 != 0 {
+		return nil, nil
+	}
+
+	payloadSize := 0
+	for _, rr := range query.Additional {
+		if rr.Type != RRTypeOPT {
+			continue
+		}
+		if len(resp.Additional) != 0 {
+			resp.Flags |= RcodeFormatError
+			return resp, nil
+		}
+		resp.Additional = append(resp.Additional, RR{
+			Name:  Name{},
+			Type:  RRTypeOPT,
+			Class: 4096,
+			TTL:   0,
+			Data:  []byte{},
+		})
+		additional := &resp.Additional[0]
+
+		version := (rr.TTL >> 16) & 0xff
+		if version != 0 {
+			resp.Flags |= ExtendedRcodeBadVers & 0xf
+			additional.TTL = (ExtendedRcodeBadVers >> 4) << 24
+			return resp, nil
+		}
+
+		payloadSize = int(rr.Class)
+	}
+	if payloadSize < 512 {
+		payloadSize = 512
+	}
+
+	if len(query.Question) != 1 {
+		resp.Flags |= RcodeFormatError
+		return resp, nil
+	}
+	question := query.Question[0]
+
+	prefix, ok := question.Name.TrimSuffix(domain)
+	if !ok {
+		resp.Flags |= RcodeNameError
+		return resp, nil
+	}
+	resp.Flags |= 0x0400
+
+	if query.Opcode() != 0 {
+		resp.Flags |= RcodeNotImplemented
+		return resp, nil
+	}
+
+	if question.Type != RRTypeTXT {
+		resp.Flags |= RcodeNameError
+		return resp, nil
+	}
+
+	encoded := bytes.ToUpper(bytes.Join(prefix, nil))
+	payload := make([]byte, base32Encoding.DecodedLen(len(encoded)))
+	n, err := base32Encoding.Decode(payload, encoded)
+	if err != nil {
+		resp.Flags |= RcodeNameError
+		return resp, nil
+	}
+	payload = payload[:n]
+
+	if payloadSize < maxUDPPayload {
+		resp.Flags |= RcodeFormatError
+		return resp, nil
+	}
+
+	return resp, payload
+}
+
+func computeMaxEncodedPayload(limit int) int {
+	maxLengthName, err := NewName([][]byte{
+		[]byte("AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"),
+		[]byte("AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"),
+		[]byte("AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"),
+		[]byte("AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"),
+	})
+	if err != nil {
+		panic(err)
+	}
+	{
+		n := 0
+		for _, label := range maxLengthName {
+			n += len(label) + 1
+		}
+		n += 1
+		if n != 255 {
+			panic("computeMaxEncodedPayload n != 255")
+		}
+	}
+
+	queryLimit := uint16(limit)
+	if int(queryLimit) != limit {
+		queryLimit = 0xffff
+	}
+	query := &Message{
+		Question: []Question{
+			{
+				Name:  maxLengthName,
+				Type:  RRTypeTXT,
+				Class: RRTypeTXT,
+			},
+		},
+
+		Additional: []RR{
+			{
+				Name:  Name{},
+				Type:  RRTypeOPT,
+				Class: queryLimit,
+				TTL:   0,
+				Data:  []byte{},
+			},
+		},
+	}
+	resp, _ := responseFor(query, [][]byte{})
+
+	resp.Answer = []RR{
+		{
+			Name:  query.Question[0].Name,
+			Type:  query.Question[0].Type,
+			Class: query.Question[0].Class,
+			TTL:   responseTTL,
+			Data:  nil,
+		},
+	}
+
+	low := 0
+	high := 32768
+	for low+1 < high {
+		mid := (low + high) / 2
+		resp.Answer[0].Data = EncodeRDataTXT(make([]byte, mid))
+		buf, err := resp.WireFormat()
+		if err != nil {
+			panic(err)
+		}
+		if len(buf) <= limit {
+			low = mid
+		} else {
+			high = mid
+		}
+	}
+
+	return low
+}

transport/internet/header_test.go

@@ -1,49 +0,0 @@
-package internet_test
-
-import (
-	"testing"
-
-	"github.com/xtls/xray-core/common"
-	. "github.com/xtls/xray-core/transport/internet"
-	"github.com/xtls/xray-core/transport/internet/headers/noop"
-	"github.com/xtls/xray-core/transport/internet/headers/srtp"
-	"github.com/xtls/xray-core/transport/internet/headers/utp"
-	"github.com/xtls/xray-core/transport/internet/headers/wechat"
-	"github.com/xtls/xray-core/transport/internet/headers/wireguard"
-)
-
-func TestAllHeadersLoadable(t *testing.T) {
-	testCases := []struct {
-		Input interface{}
-		Size  int32
-	}{
-		{
-			Input: new(noop.Config),
-			Size:  0,
-		},
-		{
-			Input: new(srtp.Config),
-			Size:  4,
-		},
-		{
-			Input: new(utp.Config),
-			Size:  4,
-		},
-		{
-			Input: new(wechat.VideoConfig),
-			Size:  13,
-		},
-		{
-			Input: new(wireguard.WireguardConfig),
-			Size:  4,
-		},
-	}
-
-	for _, testCase := range testCases {
-		header, err := CreatePacketHeader(testCase.Input)
-		common.Must(err)
-		if header.Size() != testCase.Size {
-			t.Error("expected size ", testCase.Size, " but got ", header.Size())
-		}
-	}
-}

transport/internet/headers/dns/config.pb.go

@@ -1,137 +0,0 @@
-// Code generated by protoc-gen-go. DO NOT EDIT.
-// versions:
-// 	protoc-gen-go v1.35.1
-// 	protoc        v5.28.2
-// source: transport/internet/headers/dns/config.proto
-
-package dns
-
-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 Config struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	Domain string `protobuf:"bytes,1,opt,name=domain,proto3" json:"domain,omitempty"`
-}
-
-func (x *Config) Reset() {
-	*x = Config{}
-	mi := &file_transport_internet_headers_dns_config_proto_msgTypes[0]
-	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_transport_internet_headers_dns_config_proto_msgTypes[0]
-	if 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_transport_internet_headers_dns_config_proto_rawDescGZIP(), []int{0}
-}
-
-func (x *Config) GetDomain() string {
-	if x != nil {
-		return x.Domain
-	}
-	return ""
-}
-
-var File_transport_internet_headers_dns_config_proto protoreflect.FileDescriptor
-
-var file_transport_internet_headers_dns_config_proto_rawDesc = []byte{
-	0x0a, 0x2b, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2f, 0x69, 0x6e, 0x74, 0x65,
-	0x72, 0x6e, 0x65, 0x74, 0x2f, 0x68, 0x65, 0x61, 0x64, 0x65, 0x72, 0x73, 0x2f, 0x64, 0x6e, 0x73,
-	0x2f, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x23, 0x78,
-	0x72, 0x61, 0x79, 0x2e, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x69, 0x6e,
-	0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2e, 0x68, 0x65, 0x61, 0x64, 0x65, 0x72, 0x73, 0x2e, 0x64,
-	0x6e, 0x73, 0x22, 0x20, 0x0a, 0x06, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x16, 0x0a, 0x06,
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-	0x4e, 0x53, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
-}
-
-var (
-	file_transport_internet_headers_dns_config_proto_rawDescOnce sync.Once
-	file_transport_internet_headers_dns_config_proto_rawDescData = file_transport_internet_headers_dns_config_proto_rawDesc
-)
-
-func file_transport_internet_headers_dns_config_proto_rawDescGZIP() []byte {
-	file_transport_internet_headers_dns_config_proto_rawDescOnce.Do(func() {
-		file_transport_internet_headers_dns_config_proto_rawDescData = protoimpl.X.CompressGZIP(file_transport_internet_headers_dns_config_proto_rawDescData)
-	})
-	return file_transport_internet_headers_dns_config_proto_rawDescData
-}
-
-var file_transport_internet_headers_dns_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
-var file_transport_internet_headers_dns_config_proto_goTypes = []any{
-	(*Config)(nil), // 0: xray.transport.internet.headers.dns.Config
-}
-var file_transport_internet_headers_dns_config_proto_depIdxs = []int32{
-	0, // [0:0] is the sub-list for method output_type
-	0, // [0:0] is the sub-list for method input_type
-	0, // [0:0] is the sub-list for extension type_name
-	0, // [0:0] is the sub-list for extension extendee
-	0, // [0:0] is the sub-list for field type_name
-}
-
-func init() { file_transport_internet_headers_dns_config_proto_init() }
-func file_transport_internet_headers_dns_config_proto_init() {
-	if File_transport_internet_headers_dns_config_proto != nil {
-		return
-	}
-	type x struct{}
-	out := protoimpl.TypeBuilder{
-		File: protoimpl.DescBuilder{
-			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
-			RawDescriptor: file_transport_internet_headers_dns_config_proto_rawDesc,
-			NumEnums:      0,
-			NumMessages:   1,
-			NumExtensions: 0,
-			NumServices:   0,
-		},
-		GoTypes:           file_transport_internet_headers_dns_config_proto_goTypes,
-		DependencyIndexes: file_transport_internet_headers_dns_config_proto_depIdxs,
-		MessageInfos:      file_transport_internet_headers_dns_config_proto_msgTypes,
-	}.Build()
-	File_transport_internet_headers_dns_config_proto = out.File
-	file_transport_internet_headers_dns_config_proto_rawDesc = nil
-	file_transport_internet_headers_dns_config_proto_goTypes = nil
-	file_transport_internet_headers_dns_config_proto_depIdxs = nil
-}

transport/internet/headers/dns/config.proto

@@ -1,12 +0,0 @@
-syntax = "proto3";
-
-package xray.transport.internet.headers.dns;
-option csharp_namespace = "Xray.Transport.Internet.Headers.DNS";
-option go_package = "github.com/xtls/xray-core/transport/internet/headers/dns";
-option java_package = "com.xray.transport.internet.headers.dns";
-option java_multiple_files = true;
-
-message Config {
-    string domain = 1;
-}
-

transport/internet/headers/dns/dns.go

@@ -1,123 +0,0 @@
-package dns
-
-import (
-	"context"
-	"encoding/binary"
-	"errors"
-
-	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/dice"
-)
-
-type DNS struct {
-	header []byte
-}
-
-func (d DNS) Size() int32 {
-	return int32(len(d.header))
-}
-
-// Serialize implements PacketHeader.
-func (d DNS) Serialize(b []byte) {
-	copy(b, d.header)
-	binary.BigEndian.PutUint16(b[0:], dice.RollUint16()) // random transaction ID
-}
-
-// NewDNS returns a new DNS instance based on given config.
-func NewDNS(ctx context.Context, config interface{}) (interface{}, error) {
-	var header []byte
-
-	header = binary.BigEndian.AppendUint16(header, 0x0000) // Transaction ID
-	header = binary.BigEndian.AppendUint16(header, 0x0100) // Flags: Standard query
-	header = binary.BigEndian.AppendUint16(header, 0x0001) // Questions
-	header = binary.BigEndian.AppendUint16(header, 0x0000) // Answer RRs
-	header = binary.BigEndian.AppendUint16(header, 0x0000) // Authority RRs
-	header = binary.BigEndian.AppendUint16(header, 0x0000) // Additional RRs
-
-	buf := make([]byte, 0x100)
-
-	off1, err := packDomainName(config.(*Config).Domain+".", buf)
-	if err != nil {
-		return nil, err
-	}
-
-	header = append(header, buf[:off1]...)
-
-	header = binary.BigEndian.AppendUint16(header, 0x0001) // Type: A
-	header = binary.BigEndian.AppendUint16(header, 0x0001) // Class: IN
-
-	return DNS{
-		header: header,
-	}, nil
-}
-
-// copied from github.com/miekg/dns
-func packDomainName(s string, msg []byte) (off1 int, err error) {
-	off := 0
-	ls := len(s)
-	// Each dot ends a segment of the name.
-	// We trade each dot byte for a length byte.
-	// Except for escaped dots (\.), which are normal dots.
-	// There is also a trailing zero.
-
-	// Emit sequence of counted strings, chopping at dots.
-	var (
-		begin int
-		bs    []byte
-	)
-	for i := 0; i < ls; i++ {
-		var c byte
-		if bs == nil {
-			c = s[i]
-		} else {
-			c = bs[i]
-		}
-
-		switch c {
-		case '\\':
-			if off+1 > len(msg) {
-				return len(msg), errors.New("buffer size too small")
-			}
-
-			if bs == nil {
-				bs = []byte(s)
-			}
-
-			copy(bs[i:ls-1], bs[i+1:])
-			ls--
-		case '.':
-			labelLen := i - begin
-			if labelLen >= 1<<6 { // top two bits of length must be clear
-				return len(msg), errors.New("bad rdata")
-			}
-
-			// off can already (we're in a loop) be bigger than len(msg)
-			// this happens when a name isn't fully qualified
-			if off+1+labelLen > len(msg) {
-				return len(msg), errors.New("buffer size too small")
-			}
-
-			// The following is covered by the length check above.
-			msg[off] = byte(labelLen)
-
-			if bs == nil {
-				copy(msg[off+1:], s[begin:i])
-			} else {
-				copy(msg[off+1:], bs[begin:i])
-			}
-			off += 1 + labelLen
-			begin = i + 1
-		default:
-		}
-	}
-
-	if off < len(msg) {
-		msg[off] = 0
-	}
-
-	return off + 1, nil
-}
-
-func init() {
-	common.Must(common.RegisterConfig((*Config)(nil), NewDNS))
-}

transport/internet/headers/srtp/config.pb.go

@@ -1,187 +0,0 @@
-// Code generated by protoc-gen-go. DO NOT EDIT.
-// versions:
-// 	protoc-gen-go v1.35.1
-// 	protoc        v5.28.2
-// source: transport/internet/headers/srtp/config.proto
-
-package srtp
-
-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 Config struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	Version     uint32 `protobuf:"varint,1,opt,name=version,proto3" json:"version,omitempty"`
-	Padding     bool   `protobuf:"varint,2,opt,name=padding,proto3" json:"padding,omitempty"`
-	Extension   bool   `protobuf:"varint,3,opt,name=extension,proto3" json:"extension,omitempty"`
-	CsrcCount   uint32 `protobuf:"varint,4,opt,name=csrc_count,json=csrcCount,proto3" json:"csrc_count,omitempty"`
-	Marker      bool   `protobuf:"varint,5,opt,name=marker,proto3" json:"marker,omitempty"`
-	PayloadType uint32 `protobuf:"varint,6,opt,name=payload_type,json=payloadType,proto3" json:"payload_type,omitempty"`
-}
-
-func (x *Config) Reset() {
-	*x = Config{}
-	mi := &file_transport_internet_headers_srtp_config_proto_msgTypes[0]
-	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_transport_internet_headers_srtp_config_proto_msgTypes[0]
-	if 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_transport_internet_headers_srtp_config_proto_rawDescGZIP(), []int{0}
-}
-
-func (x *Config) GetVersion() uint32 {
-	if x != nil {
-		return x.Version
-	}
-	return 0
-}
-
-func (x *Config) GetPadding() bool {
-	if x != nil {
-		return x.Padding
-	}
-	return false
-}
-
-func (x *Config) GetExtension() bool {
-	if x != nil {
-		return x.Extension
-	}
-	return false
-}
-
-func (x *Config) GetCsrcCount() uint32 {
-	if x != nil {
-		return x.CsrcCount
-	}
-	return 0
-}
-
-func (x *Config) GetMarker() bool {
-	if x != nil {
-		return x.Marker
-	}
-	return false
-}
-
-func (x *Config) GetPayloadType() uint32 {
-	if x != nil {
-		return x.PayloadType
-	}
-	return 0
-}
-
-var File_transport_internet_headers_srtp_config_proto protoreflect.FileDescriptor
-
-var file_transport_internet_headers_srtp_config_proto_rawDesc = []byte{
-	0x0a, 0x2c, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2f, 0x69, 0x6e, 0x74, 0x65,
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-	0x6f, 0x74, 0x6f, 0x33,
-}
-
-var (
-	file_transport_internet_headers_srtp_config_proto_rawDescOnce sync.Once
-	file_transport_internet_headers_srtp_config_proto_rawDescData = file_transport_internet_headers_srtp_config_proto_rawDesc
-)
-
-func file_transport_internet_headers_srtp_config_proto_rawDescGZIP() []byte {
-	file_transport_internet_headers_srtp_config_proto_rawDescOnce.Do(func() {
-		file_transport_internet_headers_srtp_config_proto_rawDescData = protoimpl.X.CompressGZIP(file_transport_internet_headers_srtp_config_proto_rawDescData)
-	})
-	return file_transport_internet_headers_srtp_config_proto_rawDescData
-}
-
-var file_transport_internet_headers_srtp_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
-var file_transport_internet_headers_srtp_config_proto_goTypes = []any{
-	(*Config)(nil), // 0: xray.transport.internet.headers.srtp.Config
-}
-var file_transport_internet_headers_srtp_config_proto_depIdxs = []int32{
-	0, // [0:0] is the sub-list for method output_type
-	0, // [0:0] is the sub-list for method input_type
-	0, // [0:0] is the sub-list for extension type_name
-	0, // [0:0] is the sub-list for extension extendee
-	0, // [0:0] is the sub-list for field type_name
-}
-
-func init() { file_transport_internet_headers_srtp_config_proto_init() }
-func file_transport_internet_headers_srtp_config_proto_init() {
-	if File_transport_internet_headers_srtp_config_proto != nil {
-		return
-	}
-	type x struct{}
-	out := protoimpl.TypeBuilder{
-		File: protoimpl.DescBuilder{
-			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
-			RawDescriptor: file_transport_internet_headers_srtp_config_proto_rawDesc,
-			NumEnums:      0,
-			NumMessages:   1,
-			NumExtensions: 0,
-			NumServices:   0,
-		},
-		GoTypes:           file_transport_internet_headers_srtp_config_proto_goTypes,
-		DependencyIndexes: file_transport_internet_headers_srtp_config_proto_depIdxs,
-		MessageInfos:      file_transport_internet_headers_srtp_config_proto_msgTypes,
-	}.Build()
-	File_transport_internet_headers_srtp_config_proto = out.File
-	file_transport_internet_headers_srtp_config_proto_rawDesc = nil
-	file_transport_internet_headers_srtp_config_proto_goTypes = nil
-	file_transport_internet_headers_srtp_config_proto_depIdxs = nil
-}

transport/internet/headers/srtp/config.proto

@@ -1,16 +0,0 @@
-syntax = "proto3";
-
-package xray.transport.internet.headers.srtp;
-option csharp_namespace = "Xray.Transport.Internet.Headers.Srtp";
-option go_package = "github.com/xtls/xray-core/transport/internet/headers/srtp";
-option java_package = "com.xray.transport.internet.headers.srtp";
-option java_multiple_files = true;
-
-message Config {
-  uint32 version = 1;
-	bool padding = 2;
-	bool extension   = 3;
-	uint32 csrc_count = 4;
-	bool marker     = 5;
-	uint32 payload_type = 6;
-}

transport/internet/headers/srtp/srtp.go

@@ -1,37 +0,0 @@
-package srtp
-
-import (
-	"context"
-	"encoding/binary"
-
-	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/dice"
-)
-
-type SRTP struct {
-	header uint16
-	number uint16
-}
-
-func (*SRTP) Size() int32 {
-	return 4
-}
-
-// Serialize implements PacketHeader.
-func (s *SRTP) Serialize(b []byte) {
-	s.number++
-	binary.BigEndian.PutUint16(b, s.header)
-	binary.BigEndian.PutUint16(b[2:], s.number)
-}
-
-// New returns a new SRTP instance based on the given config.
-func New(ctx context.Context, config interface{}) (interface{}, error) {
-	return &SRTP{
-		header: 0xB5E8,
-		number: dice.RollUint16(),
-	}, nil
-}
-
-func init() {
-	common.Must(common.RegisterConfig((*Config)(nil), New))
-}

transport/internet/headers/srtp/srtp_test.go

@@ -1,27 +0,0 @@
-package srtp_test
-
-import (
-	"context"
-	"testing"
-
-	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/buf"
-	. "github.com/xtls/xray-core/transport/internet/headers/srtp"
-)
-
-func TestSRTPWrite(t *testing.T) {
-	content := []byte{'a', 'b', 'c', 'd', 'e', 'f', 'g'}
-	srtpRaw, err := New(context.Background(), &Config{})
-	common.Must(err)
-
-	srtp := srtpRaw.(*SRTP)
-
-	payload := buf.New()
-	srtp.Serialize(payload.Extend(srtp.Size()))
-	payload.Write(content)
-
-	expectedLen := int32(len(content)) + srtp.Size()
-	if payload.Len() != expectedLen {
-		t.Error("expected ", expectedLen, " of bytes, but got ", payload.Len())
-	}
-}

transport/internet/headers/tls/config.pb.go

@@ -1,127 +0,0 @@
-// Code generated by protoc-gen-go. DO NOT EDIT.
-// versions:
-// 	protoc-gen-go v1.35.1
-// 	protoc        v5.28.2
-// source: transport/internet/headers/tls/config.proto
-
-package tls
-
-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 PacketConfig struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-}
-
-func (x *PacketConfig) Reset() {
-	*x = PacketConfig{}
-	mi := &file_transport_internet_headers_tls_config_proto_msgTypes[0]
-	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-	ms.StoreMessageInfo(mi)
-}
-
-func (x *PacketConfig) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*PacketConfig) ProtoMessage() {}
-
-func (x *PacketConfig) ProtoReflect() protoreflect.Message {
-	mi := &file_transport_internet_headers_tls_config_proto_msgTypes[0]
-	if x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use PacketConfig.ProtoReflect.Descriptor instead.
-func (*PacketConfig) Descriptor() ([]byte, []int) {
-	return file_transport_internet_headers_tls_config_proto_rawDescGZIP(), []int{0}
-}
-
-var File_transport_internet_headers_tls_config_proto protoreflect.FileDescriptor
-
-var file_transport_internet_headers_tls_config_proto_rawDesc = []byte{
-	0x0a, 0x2b, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2f, 0x69, 0x6e, 0x74, 0x65,
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-	0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
-}
-
-var (
-	file_transport_internet_headers_tls_config_proto_rawDescOnce sync.Once
-	file_transport_internet_headers_tls_config_proto_rawDescData = file_transport_internet_headers_tls_config_proto_rawDesc
-)
-
-func file_transport_internet_headers_tls_config_proto_rawDescGZIP() []byte {
-	file_transport_internet_headers_tls_config_proto_rawDescOnce.Do(func() {
-		file_transport_internet_headers_tls_config_proto_rawDescData = protoimpl.X.CompressGZIP(file_transport_internet_headers_tls_config_proto_rawDescData)
-	})
-	return file_transport_internet_headers_tls_config_proto_rawDescData
-}
-
-var file_transport_internet_headers_tls_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
-var file_transport_internet_headers_tls_config_proto_goTypes = []any{
-	(*PacketConfig)(nil), // 0: xray.transport.internet.headers.tls.PacketConfig
-}
-var file_transport_internet_headers_tls_config_proto_depIdxs = []int32{
-	0, // [0:0] is the sub-list for method output_type
-	0, // [0:0] is the sub-list for method input_type
-	0, // [0:0] is the sub-list for extension type_name
-	0, // [0:0] is the sub-list for extension extendee
-	0, // [0:0] is the sub-list for field type_name
-}
-
-func init() { file_transport_internet_headers_tls_config_proto_init() }
-func file_transport_internet_headers_tls_config_proto_init() {
-	if File_transport_internet_headers_tls_config_proto != nil {
-		return
-	}
-	type x struct{}
-	out := protoimpl.TypeBuilder{
-		File: protoimpl.DescBuilder{
-			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
-			RawDescriptor: file_transport_internet_headers_tls_config_proto_rawDesc,
-			NumEnums:      0,
-			NumMessages:   1,
-			NumExtensions: 0,
-			NumServices:   0,
-		},
-		GoTypes:           file_transport_internet_headers_tls_config_proto_goTypes,
-		DependencyIndexes: file_transport_internet_headers_tls_config_proto_depIdxs,
-		MessageInfos:      file_transport_internet_headers_tls_config_proto_msgTypes,
-	}.Build()
-	File_transport_internet_headers_tls_config_proto = out.File
-	file_transport_internet_headers_tls_config_proto_rawDesc = nil
-	file_transport_internet_headers_tls_config_proto_goTypes = nil
-	file_transport_internet_headers_tls_config_proto_depIdxs = nil
-}

transport/internet/headers/tls/config.proto

@@ -1,9 +0,0 @@
-syntax = "proto3";
-
-package xray.transport.internet.headers.tls;
-option csharp_namespace = "Xray.Transport.Internet.Headers.Tls";
-option go_package = "github.com/xtls/xray-core/transport/internet/headers/tls";
-option java_package = "com.xray.transport.internet.headers.tls";
-option java_multiple_files = true;
-
-message PacketConfig {}

transport/internet/headers/tls/dtls.go

@@ -1,55 +0,0 @@
-package tls
-
-import (
-	"context"
-
-	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/dice"
-)
-
-// DTLS writes header as DTLS. See https://tools.ietf.org/html/rfc6347
-type DTLS struct {
-	epoch    uint16
-	length   uint16
-	sequence uint32
-}
-
-// Size implements PacketHeader.
-func (*DTLS) Size() int32 {
-	return 1 + 2 + 2 + 6 + 2
-}
-
-// Serialize implements PacketHeader.
-func (d *DTLS) Serialize(b []byte) {
-	b[0] = 23 // application data
-	b[1] = 254
-	b[2] = 253
-	b[3] = byte(d.epoch >> 8)
-	b[4] = byte(d.epoch)
-	b[5] = 0
-	b[6] = 0
-	b[7] = byte(d.sequence >> 24)
-	b[8] = byte(d.sequence >> 16)
-	b[9] = byte(d.sequence >> 8)
-	b[10] = byte(d.sequence)
-	d.sequence++
-	b[11] = byte(d.length >> 8)
-	b[12] = byte(d.length)
-	d.length += 17
-	if d.length > 100 {
-		d.length -= 50
-	}
-}
-
-// New creates a new UTP header for the given config.
-func New(ctx context.Context, config interface{}) (interface{}, error) {
-	return &DTLS{
-		epoch:    dice.RollUint16(),
-		sequence: 0,
-		length:   17,
-	}, nil
-}
-
-func init() {
-	common.Must(common.RegisterConfig((*PacketConfig)(nil), New))
-}

transport/internet/headers/tls/dtls_test.go

@@ -1,26 +0,0 @@
-package tls_test
-
-import (
-	"context"
-	"testing"
-
-	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/buf"
-	. "github.com/xtls/xray-core/transport/internet/headers/tls"
-)
-
-func TestDTLSWrite(t *testing.T) {
-	content := []byte{'a', 'b', 'c', 'd', 'e', 'f', 'g'}
-	dtlsRaw, err := New(context.Background(), &PacketConfig{})
-	common.Must(err)
-
-	dtls := dtlsRaw.(*DTLS)
-
-	payload := buf.New()
-	dtls.Serialize(payload.Extend(dtls.Size()))
-	payload.Write(content)
-
-	if payload.Len() != int32(len(content))+dtls.Size() {
-		t.Error("payload len: ", payload.Len(), " want ", int32(len(content))+dtls.Size())
-	}
-}

transport/internet/headers/utp/config.pb.go

@@ -1,137 +0,0 @@
-// Code generated by protoc-gen-go. DO NOT EDIT.
-// versions:
-// 	protoc-gen-go v1.35.1
-// 	protoc        v5.28.2
-// source: transport/internet/headers/utp/config.proto
-
-package utp
-
-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 Config struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	Version uint32 `protobuf:"varint,1,opt,name=version,proto3" json:"version,omitempty"`
-}
-
-func (x *Config) Reset() {
-	*x = Config{}
-	mi := &file_transport_internet_headers_utp_config_proto_msgTypes[0]
-	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_transport_internet_headers_utp_config_proto_msgTypes[0]
-	if 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_transport_internet_headers_utp_config_proto_rawDescGZIP(), []int{0}
-}
-
-func (x *Config) GetVersion() uint32 {
-	if x != nil {
-		return x.Version
-	}
-	return 0
-}
-
-var File_transport_internet_headers_utp_config_proto protoreflect.FileDescriptor
-
-var file_transport_internet_headers_utp_config_proto_rawDesc = []byte{
-	0x0a, 0x2b, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2f, 0x69, 0x6e, 0x74, 0x65,
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-	0x2e, 0x55, 0x74, 0x70, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
-}
-
-var (
-	file_transport_internet_headers_utp_config_proto_rawDescOnce sync.Once
-	file_transport_internet_headers_utp_config_proto_rawDescData = file_transport_internet_headers_utp_config_proto_rawDesc
-)
-
-func file_transport_internet_headers_utp_config_proto_rawDescGZIP() []byte {
-	file_transport_internet_headers_utp_config_proto_rawDescOnce.Do(func() {
-		file_transport_internet_headers_utp_config_proto_rawDescData = protoimpl.X.CompressGZIP(file_transport_internet_headers_utp_config_proto_rawDescData)
-	})
-	return file_transport_internet_headers_utp_config_proto_rawDescData
-}
-
-var file_transport_internet_headers_utp_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
-var file_transport_internet_headers_utp_config_proto_goTypes = []any{
-	(*Config)(nil), // 0: xray.transport.internet.headers.utp.Config
-}
-var file_transport_internet_headers_utp_config_proto_depIdxs = []int32{
-	0, // [0:0] is the sub-list for method output_type
-	0, // [0:0] is the sub-list for method input_type
-	0, // [0:0] is the sub-list for extension type_name
-	0, // [0:0] is the sub-list for extension extendee
-	0, // [0:0] is the sub-list for field type_name
-}
-
-func init() { file_transport_internet_headers_utp_config_proto_init() }
-func file_transport_internet_headers_utp_config_proto_init() {
-	if File_transport_internet_headers_utp_config_proto != nil {
-		return
-	}
-	type x struct{}
-	out := protoimpl.TypeBuilder{
-		File: protoimpl.DescBuilder{
-			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
-			RawDescriptor: file_transport_internet_headers_utp_config_proto_rawDesc,
-			NumEnums:      0,
-			NumMessages:   1,
-			NumExtensions: 0,
-			NumServices:   0,
-		},
-		GoTypes:           file_transport_internet_headers_utp_config_proto_goTypes,
-		DependencyIndexes: file_transport_internet_headers_utp_config_proto_depIdxs,
-		MessageInfos:      file_transport_internet_headers_utp_config_proto_msgTypes,
-	}.Build()
-	File_transport_internet_headers_utp_config_proto = out.File
-	file_transport_internet_headers_utp_config_proto_rawDesc = nil
-	file_transport_internet_headers_utp_config_proto_goTypes = nil
-	file_transport_internet_headers_utp_config_proto_depIdxs = nil
-}

transport/internet/headers/utp/config.proto

@@ -1,11 +0,0 @@
-syntax = "proto3";
-
-package xray.transport.internet.headers.utp;
-option csharp_namespace = "Xray.Transport.Internet.Headers.Utp";
-option go_package = "github.com/xtls/xray-core/transport/internet/headers/utp";
-option java_package = "com.xray.transport.internet.headers.utp";
-option java_multiple_files = true;
-
-message Config {
-  uint32 version = 1;
-}

transport/internet/headers/utp/utp.go

@@ -1,39 +0,0 @@
-package utp
-
-import (
-	"context"
-	"encoding/binary"
-
-	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/dice"
-)
-
-type UTP struct {
-	header       byte
-	extension    byte
-	connectionID uint16
-}
-
-func (*UTP) Size() int32 {
-	return 4
-}
-
-// Serialize implements PacketHeader.
-func (u *UTP) Serialize(b []byte) {
-	binary.BigEndian.PutUint16(b, u.connectionID)
-	b[2] = u.header
-	b[3] = u.extension
-}
-
-// New creates a new UTP header for the given config.
-func New(ctx context.Context, config interface{}) (interface{}, error) {
-	return &UTP{
-		header:       1,
-		extension:    0,
-		connectionID: dice.RollUint16(),
-	}, nil
-}
-
-func init() {
-	common.Must(common.RegisterConfig((*Config)(nil), New))
-}

transport/internet/headers/utp/utp_test.go

@@ -1,26 +0,0 @@
-package utp_test
-
-import (
-	"context"
-	"testing"
-
-	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/buf"
-	. "github.com/xtls/xray-core/transport/internet/headers/utp"
-)
-
-func TestUTPWrite(t *testing.T) {
-	content := []byte{'a', 'b', 'c', 'd', 'e', 'f', 'g'}
-	utpRaw, err := New(context.Background(), &Config{})
-	common.Must(err)
-
-	utp := utpRaw.(*UTP)
-
-	payload := buf.New()
-	utp.Serialize(payload.Extend(utp.Size()))
-	payload.Write(content)
-
-	if payload.Len() != int32(len(content))+utp.Size() {
-		t.Error("unexpected payload length: ", payload.Len())
-	}
-}

transport/internet/headers/wechat/config.pb.go

@@ -1,128 +0,0 @@
-// Code generated by protoc-gen-go. DO NOT EDIT.
-// versions:
-// 	protoc-gen-go v1.35.1
-// 	protoc        v5.28.2
-// source: transport/internet/headers/wechat/config.proto
-
-package wechat
-
-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 VideoConfig struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-}
-
-func (x *VideoConfig) Reset() {
-	*x = VideoConfig{}
-	mi := &file_transport_internet_headers_wechat_config_proto_msgTypes[0]
-	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-	ms.StoreMessageInfo(mi)
-}
-
-func (x *VideoConfig) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*VideoConfig) ProtoMessage() {}
-
-func (x *VideoConfig) ProtoReflect() protoreflect.Message {
-	mi := &file_transport_internet_headers_wechat_config_proto_msgTypes[0]
-	if x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use VideoConfig.ProtoReflect.Descriptor instead.
-func (*VideoConfig) Descriptor() ([]byte, []int) {
-	return file_transport_internet_headers_wechat_config_proto_rawDescGZIP(), []int{0}
-}
-
-var File_transport_internet_headers_wechat_config_proto protoreflect.FileDescriptor
-
-var file_transport_internet_headers_wechat_config_proto_rawDesc = []byte{
-	0x0a, 0x2e, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2f, 0x69, 0x6e, 0x74, 0x65,
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-	0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x49, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2e,
-	0x48, 0x65, 0x61, 0x64, 0x65, 0x72, 0x73, 0x2e, 0x57, 0x65, 0x63, 0x68, 0x61, 0x74, 0x62, 0x06,
-	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
-}
-
-var (
-	file_transport_internet_headers_wechat_config_proto_rawDescOnce sync.Once
-	file_transport_internet_headers_wechat_config_proto_rawDescData = file_transport_internet_headers_wechat_config_proto_rawDesc
-)
-
-func file_transport_internet_headers_wechat_config_proto_rawDescGZIP() []byte {
-	file_transport_internet_headers_wechat_config_proto_rawDescOnce.Do(func() {
-		file_transport_internet_headers_wechat_config_proto_rawDescData = protoimpl.X.CompressGZIP(file_transport_internet_headers_wechat_config_proto_rawDescData)
-	})
-	return file_transport_internet_headers_wechat_config_proto_rawDescData
-}
-
-var file_transport_internet_headers_wechat_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
-var file_transport_internet_headers_wechat_config_proto_goTypes = []any{
-	(*VideoConfig)(nil), // 0: xray.transport.internet.headers.wechat.VideoConfig
-}
-var file_transport_internet_headers_wechat_config_proto_depIdxs = []int32{
-	0, // [0:0] is the sub-list for method output_type
-	0, // [0:0] is the sub-list for method input_type
-	0, // [0:0] is the sub-list for extension type_name
-	0, // [0:0] is the sub-list for extension extendee
-	0, // [0:0] is the sub-list for field type_name
-}
-
-func init() { file_transport_internet_headers_wechat_config_proto_init() }
-func file_transport_internet_headers_wechat_config_proto_init() {
-	if File_transport_internet_headers_wechat_config_proto != nil {
-		return
-	}
-	type x struct{}
-	out := protoimpl.TypeBuilder{
-		File: protoimpl.DescBuilder{
-			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
-			RawDescriptor: file_transport_internet_headers_wechat_config_proto_rawDesc,
-			NumEnums:      0,
-			NumMessages:   1,
-			NumExtensions: 0,
-			NumServices:   0,
-		},
-		GoTypes:           file_transport_internet_headers_wechat_config_proto_goTypes,
-		DependencyIndexes: file_transport_internet_headers_wechat_config_proto_depIdxs,
-		MessageInfos:      file_transport_internet_headers_wechat_config_proto_msgTypes,
-	}.Build()
-	File_transport_internet_headers_wechat_config_proto = out.File
-	file_transport_internet_headers_wechat_config_proto_rawDesc = nil
-	file_transport_internet_headers_wechat_config_proto_goTypes = nil
-	file_transport_internet_headers_wechat_config_proto_depIdxs = nil
-}

transport/internet/headers/wechat/config.proto

@@ -1,9 +0,0 @@
-syntax = "proto3";
-
-package xray.transport.internet.headers.wechat;
-option csharp_namespace = "Xray.Transport.Internet.Headers.Wechat";
-option go_package = "github.com/xtls/xray-core/transport/internet/headers/wechat";
-option java_package = "com.xray.transport.internet.headers.wechat";
-option java_multiple_files = true;
-
-message VideoConfig {}

transport/internet/headers/wechat/wechat.go

@@ -1,43 +0,0 @@
-package wechat
-
-import (
-	"context"
-	"encoding/binary"
-
-	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/dice"
-)
-
-type VideoChat struct {
-	sn uint32
-}
-
-func (vc *VideoChat) Size() int32 {
-	return 13
-}
-
-// Serialize implements PacketHeader.
-func (vc *VideoChat) Serialize(b []byte) {
-	vc.sn++
-	b[0] = 0xa1
-	b[1] = 0x08
-	binary.BigEndian.PutUint32(b[2:], vc.sn) // b[2:6]
-	b[6] = 0x00
-	b[7] = 0x10
-	b[8] = 0x11
-	b[9] = 0x18
-	b[10] = 0x30
-	b[11] = 0x22
-	b[12] = 0x30
-}
-
-// NewVideoChat returns a new VideoChat instance based on given config.
-func NewVideoChat(ctx context.Context, config interface{}) (interface{}, error) {
-	return &VideoChat{
-		sn: uint32(dice.RollUint16()),
-	}, nil
-}
-
-func init() {
-	common.Must(common.RegisterConfig((*VideoConfig)(nil), NewVideoChat))
-}

transport/internet/headers/wechat/wechat_test.go

@@ -1,24 +0,0 @@
-package wechat_test
-
-import (
-	"context"
-	"testing"
-
-	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/buf"
-	. "github.com/xtls/xray-core/transport/internet/headers/wechat"
-)
-
-func TestUTPWrite(t *testing.T) {
-	videoRaw, err := NewVideoChat(context.Background(), &VideoConfig{})
-	common.Must(err)
-
-	video := videoRaw.(*VideoChat)
-
-	payload := buf.New()
-	video.Serialize(payload.Extend(video.Size()))
-
-	if payload.Len() != video.Size() {
-		t.Error("expected payload size ", video.Size(), " but got ", payload.Len())
-	}
-}

transport/internet/headers/wireguard/config.pb.go

@@ -1,129 +0,0 @@
-// Code generated by protoc-gen-go. DO NOT EDIT.
-// versions:
-// 	protoc-gen-go v1.35.1
-// 	protoc        v5.28.2
-// source: transport/internet/headers/wireguard/config.proto
-
-package wireguard
-
-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 WireguardConfig struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-}
-
-func (x *WireguardConfig) Reset() {
-	*x = WireguardConfig{}
-	mi := &file_transport_internet_headers_wireguard_config_proto_msgTypes[0]
-	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-	ms.StoreMessageInfo(mi)
-}
-
-func (x *WireguardConfig) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*WireguardConfig) ProtoMessage() {}
-
-func (x *WireguardConfig) ProtoReflect() protoreflect.Message {
-	mi := &file_transport_internet_headers_wireguard_config_proto_msgTypes[0]
-	if x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use WireguardConfig.ProtoReflect.Descriptor instead.
-func (*WireguardConfig) Descriptor() ([]byte, []int) {
-	return file_transport_internet_headers_wireguard_config_proto_rawDescGZIP(), []int{0}
-}
-
-var File_transport_internet_headers_wireguard_config_proto protoreflect.FileDescriptor
-
-var file_transport_internet_headers_wireguard_config_proto_rawDesc = []byte{
-	0x0a, 0x31, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2f, 0x69, 0x6e, 0x74, 0x65,
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-	0x67, 0x75, 0x61, 0x72, 0x64, 0xaa, 0x02, 0x29, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x54, 0x72, 0x61,
-	0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x49, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2e,
-	0x48, 0x65, 0x61, 0x64, 0x65, 0x72, 0x73, 0x2e, 0x57, 0x69, 0x72, 0x65, 0x67, 0x75, 0x61, 0x72,
-	0x64, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
-}
-
-var (
-	file_transport_internet_headers_wireguard_config_proto_rawDescOnce sync.Once
-	file_transport_internet_headers_wireguard_config_proto_rawDescData = file_transport_internet_headers_wireguard_config_proto_rawDesc
-)
-
-func file_transport_internet_headers_wireguard_config_proto_rawDescGZIP() []byte {
-	file_transport_internet_headers_wireguard_config_proto_rawDescOnce.Do(func() {
-		file_transport_internet_headers_wireguard_config_proto_rawDescData = protoimpl.X.CompressGZIP(file_transport_internet_headers_wireguard_config_proto_rawDescData)
-	})
-	return file_transport_internet_headers_wireguard_config_proto_rawDescData
-}
-
-var file_transport_internet_headers_wireguard_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
-var file_transport_internet_headers_wireguard_config_proto_goTypes = []any{
-	(*WireguardConfig)(nil), // 0: xray.transport.internet.headers.wireguard.WireguardConfig
-}
-var file_transport_internet_headers_wireguard_config_proto_depIdxs = []int32{
-	0, // [0:0] is the sub-list for method output_type
-	0, // [0:0] is the sub-list for method input_type
-	0, // [0:0] is the sub-list for extension type_name
-	0, // [0:0] is the sub-list for extension extendee
-	0, // [0:0] is the sub-list for field type_name
-}
-
-func init() { file_transport_internet_headers_wireguard_config_proto_init() }
-func file_transport_internet_headers_wireguard_config_proto_init() {
-	if File_transport_internet_headers_wireguard_config_proto != nil {
-		return
-	}
-	type x struct{}
-	out := protoimpl.TypeBuilder{
-		File: protoimpl.DescBuilder{
-			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
-			RawDescriptor: file_transport_internet_headers_wireguard_config_proto_rawDesc,
-			NumEnums:      0,
-			NumMessages:   1,
-			NumExtensions: 0,
-			NumServices:   0,
-		},
-		GoTypes:           file_transport_internet_headers_wireguard_config_proto_goTypes,
-		DependencyIndexes: file_transport_internet_headers_wireguard_config_proto_depIdxs,
-		MessageInfos:      file_transport_internet_headers_wireguard_config_proto_msgTypes,
-	}.Build()
-	File_transport_internet_headers_wireguard_config_proto = out.File
-	file_transport_internet_headers_wireguard_config_proto_rawDesc = nil
-	file_transport_internet_headers_wireguard_config_proto_goTypes = nil
-	file_transport_internet_headers_wireguard_config_proto_depIdxs = nil
-}

transport/internet/headers/wireguard/config.proto

@@ -1,9 +0,0 @@
-syntax = "proto3";
-
-package xray.transport.internet.headers.wireguard;
-option csharp_namespace = "Xray.Transport.Internet.Headers.Wireguard";
-option go_package = "github.com/xtls/xray-core/transport/internet/headers/wireguard";
-option java_package = "com.xray.transport.internet.headers.wireguard";
-option java_multiple_files = true;
-
-message WireguardConfig {}

transport/internet/headers/wireguard/wireguard.go

@@ -1,30 +0,0 @@
-package wireguard
-
-import (
-	"context"
-
-	"github.com/xtls/xray-core/common"
-)
-
-type Wireguard struct{}
-
-func (Wireguard) Size() int32 {
-	return 4
-}
-
-// Serialize implements PacketHeader.
-func (Wireguard) Serialize(b []byte) {
-	b[0] = 0x04
-	b[1] = 0x00
-	b[2] = 0x00
-	b[3] = 0x00
-}
-
-// NewWireguard returns a new VideoChat instance based on given config.
-func NewWireguard(ctx context.Context, config interface{}) (interface{}, error) {
-	return Wireguard{}, nil
-}
-
-func init() {
-	common.Must(common.RegisterConfig((*WireguardConfig)(nil), NewWireguard))
-}

transport/internet/hysteria/dialer.go

@@ -176,6 +176,7 @@ func (c *client) dial() error {
 		}
 		pktConn, err = udphop.NewUDPHopPacketConn(addr, c.config.IntervalMin, c.config.IntervalMax, c.udphopDialer, pktConn, index)
 		if err != nil {
+			raw.Close()
 			return errors.New("udphop err").Base(err)
 		}
 	}
@@ -183,6 +184,7 @@ func (c *client) dial() error {
 	if c.udpmaskManager != nil {
 		pktConn, err = c.udpmaskManager.WrapPacketConnClient(pktConn)
 		if err != nil {
+			raw.Close()
 			return errors.New("mask err").Base(err)
 		}
 	}

transport/internet/kcp/config.go

@@ -1,8 +1,6 @@
 package kcp
 
 import (
-	"crypto/cipher"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/transport/internet"
 )
@@ -48,32 +46,12 @@ func (c *Config) GetWriteBufferSize() uint32 {
 }
 
 // GetReadBufferSize returns the size of ReadBuffer in bytes.
-func (c *Config) GetReadBufferSize() uint32 {
-	if c == nil || c.ReadBuffer == nil {
-		return 2 * 1024 * 1024
-	}
-	return c.ReadBuffer.Size
-}
-
-// GetSecurity returns the security settings.
-func (c *Config) GetSecurity() (cipher.AEAD, error) {
-	if c.Seed != nil {
-		return NewAEADAESGCMBasedOnSeed(c.Seed.Seed), nil
-	}
-	return NewSimpleAuthenticator(), nil
-}
-
-func (c *Config) GetPackerHeader() (internet.PacketHeader, error) {
-	if c.HeaderConfig != nil {
-		rawConfig, err := c.HeaderConfig.GetInstance()
-		if err != nil {
-			return nil, err
-		}
-
-		return internet.CreatePacketHeader(rawConfig)
-	}
-	return nil, nil
-}
+// func (c *Config) GetReadBufferSize() uint32 {
+// 	if c == nil || c.ReadBuffer == nil {
+// 		return 2 * 1024 * 1024
+// 	}
+// 	return c.ReadBuffer.Size
+// }
 
 func (c *Config) GetSendingInFlightSize() uint32 {
 	size := c.GetUplinkCapacityValue() * 1024 * 1024 / c.GetMTUValue() / (1000 / c.GetTTIValue())
@@ -95,9 +73,9 @@ func (c *Config) GetReceivingInFlightSize() uint32 {
 	return size
 }
 
-func (c *Config) GetReceivingBufferSize() uint32 {
-	return c.GetReadBufferSize() / c.GetMTUValue()
-}
+// func (c *Config) GetReceivingBufferSize() uint32 {
+// 	return c.GetReadBufferSize() / c.GetMTUValue()
+// }
 
 func init() {
 	common.Must(internet.RegisterProtocolConfigCreator(protocolName, func() interface{} {

transport/internet/kcp/connection.go

@@ -204,7 +204,7 @@ type Connection struct {
 }
 
 // NewConnection create a new KCP connection between local and remote.
-func NewConnection(meta ConnMetadata, writer PacketWriter, closer io.Closer, config *Config) *Connection {
+func NewConnection(meta ConnMetadata, writer io.Writer, closer io.Closer, config *Config) *Connection {
 	errors.LogInfo(context.Background(), "#", meta.Conversation, " creating connection to ", meta.RemoteAddr)
 
 	conn := &Connection{
@@ -215,7 +215,7 @@ func NewConnection(meta ConnMetadata, writer PacketWriter, closer io.Closer, con
 		dataOutput: signal.NewNotifier(),
 		Config:     config,
 		output:     NewRetryableWriter(NewSegmentWriter(writer)),
-		mss:        config.GetMTUValue() - uint32(writer.Overhead()) - DataSegmentOverhead,
+		mss:        config.GetMTUValue() - DataSegmentOverhead,
 		roundTrip: &RoundTripInfo{
 			rto:    100,
 			minRtt: config.GetTTIValue(),

transport/internet/kcp/connection_test.go

@@ -16,9 +16,7 @@ func (NoOpCloser) Close() error {
 }
 
 func TestConnectionReadTimeout(t *testing.T) {
-	conn := NewConnection(ConnMetadata{Conversation: 1}, &KCPPacketWriter{
-		Writer: buf.DiscardBytes,
-	}, NoOpCloser(0), &Config{})
+	conn := NewConnection(ConnMetadata{Conversation: 1}, buf.DiscardBytes, NoOpCloser(0), &Config{})
 	conn.SetReadDeadline(time.Now().Add(time.Second))
 
 	b := make([]byte, 1024)

transport/internet/kcp/crypt.go

@@ -1,77 +0,0 @@
-package kcp
-
-import (
-	"crypto/cipher"
-	"encoding/binary"
-	"hash/fnv"
-
-	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/errors"
-)
-
-// SimpleAuthenticator is a legacy AEAD used for KCP encryption.
-type SimpleAuthenticator struct{}
-
-// NewSimpleAuthenticator creates a new SimpleAuthenticator
-func NewSimpleAuthenticator() cipher.AEAD {
-	return &SimpleAuthenticator{}
-}
-
-// NonceSize implements cipher.AEAD.NonceSize().
-func (*SimpleAuthenticator) NonceSize() int {
-	return 0
-}
-
-// Overhead implements cipher.AEAD.NonceSize().
-func (*SimpleAuthenticator) Overhead() int {
-	return 6
-}
-
-// Seal implements cipher.AEAD.Seal().
-func (a *SimpleAuthenticator) Seal(dst, nonce, plain, extra []byte) []byte {
-	dst = append(dst, 0, 0, 0, 0, 0, 0) // 4 bytes for hash, and then 2 bytes for length
-	binary.BigEndian.PutUint16(dst[4:], uint16(len(plain)))
-	dst = append(dst, plain...)
-
-	fnvHash := fnv.New32a()
-	common.Must2(fnvHash.Write(dst[4:]))
-	fnvHash.Sum(dst[:0])
-
-	dstLen := len(dst)
-	xtra := 4 - dstLen%4
-	if xtra != 4 {
-		dst = append(dst, make([]byte, xtra)...)
-	}
-	xorfwd(dst)
-	if xtra != 4 {
-		dst = dst[:dstLen]
-	}
-	return dst
-}
-
-// Open implements cipher.AEAD.Open().
-func (a *SimpleAuthenticator) Open(dst, nonce, cipherText, extra []byte) ([]byte, error) {
-	dst = append(dst, cipherText...)
-	dstLen := len(dst)
-	xtra := 4 - dstLen%4
-	if xtra != 4 {
-		dst = append(dst, make([]byte, xtra)...)
-	}
-	xorbkd(dst)
-	if xtra != 4 {
-		dst = dst[:dstLen]
-	}
-
-	fnvHash := fnv.New32a()
-	common.Must2(fnvHash.Write(dst[4:]))
-	if binary.BigEndian.Uint32(dst[:4]) != fnvHash.Sum32() {
-		return nil, errors.New("invalid auth")
-	}
-
-	length := binary.BigEndian.Uint16(dst[4:6])
-	if len(dst)-6 != int(length) {
-		return nil, errors.New("invalid auth")
-	}
-
-	return dst[6:], nil
-}

transport/internet/kcp/crypt_test.go

@@ -1,37 +0,0 @@
-package kcp_test
-
-import (
-	"testing"
-
-	"github.com/google/go-cmp/cmp"
-	"github.com/xtls/xray-core/common"
-	. "github.com/xtls/xray-core/transport/internet/kcp"
-)
-
-func TestSimpleAuthenticator(t *testing.T) {
-	cache := make([]byte, 512)
-
-	payload := []byte{'a', 'b', 'c', 'd', 'e', 'f', 'g'}
-
-	auth := NewSimpleAuthenticator()
-	b := auth.Seal(cache[:0], nil, payload, nil)
-	c, err := auth.Open(cache[:0], nil, b, nil)
-	common.Must(err)
-	if r := cmp.Diff(c, payload); r != "" {
-		t.Error(r)
-	}
-}
-
-func TestSimpleAuthenticator2(t *testing.T) {
-	cache := make([]byte, 512)
-
-	payload := []byte{'a', 'b'}
-
-	auth := NewSimpleAuthenticator()
-	b := auth.Seal(cache[:0], nil, payload, nil)
-	c, err := auth.Open(cache[:0], nil, b, nil)
-	common.Must(err)
-	if r := cmp.Diff(c, payload); r != "" {
-		t.Error(r)
-	}
-}

transport/internet/kcp/cryptreal.go

@@ -1,13 +0,0 @@
-package kcp
-
-import (
-	"crypto/cipher"
-	"crypto/sha256"
-
-	"github.com/xtls/xray-core/common/crypto"
-)
-
-func NewAEADAESGCMBasedOnSeed(seed string) cipher.AEAD {
-	hashedSeed := sha256.Sum256([]byte(seed))
-	return crypto.NewAesGcm(hashedSeed[:16])
-}

transport/internet/kcp/dialer.go

@@ -54,32 +54,32 @@ func DialKCP(ctx context.Context, dest net.Destination, streamSettings *internet
 		return nil, errors.New("failed to dial to dest: ", err).AtWarning().Base(err)
 	}
 
+	wrapper, ok := rawConn.(*internet.PacketConnWrapper)
+	if !ok {
+		rawConn.Close()
+		return nil, errors.New("raw is not PacketConnWrapper")
+	}
+
+	raw := wrapper.Conn
+
+	if streamSettings.UdpmaskManager != nil {
+		wrapper.Conn, err = streamSettings.UdpmaskManager.WrapPacketConnClient(raw)
+		if err != nil {
+			raw.Close()
+			return nil, errors.New("mask err").Base(err)
+		}
+	}
+
 	kcpSettings := streamSettings.ProtocolSettings.(*Config)
 
-	header, err := kcpSettings.GetPackerHeader()
-	if err != nil {
-		return nil, errors.New("failed to create packet header").Base(err)
-	}
-	security, err := kcpSettings.GetSecurity()
-	if err != nil {
-		return nil, errors.New("failed to create security").Base(err)
-	}
-	reader := &KCPPacketReader{
-		Header:   header,
-		Security: security,
-	}
-	writer := &KCPPacketWriter{
-		Header:   header,
-		Security: security,
-		Writer:   rawConn,
-	}
+	reader := &KCPPacketReader{}
 
 	conv := uint16(atomic.AddUint32(&globalConv, 1))
 	session := NewConnection(ConnMetadata{
 		LocalAddr:    rawConn.LocalAddr(),
 		RemoteAddr:   rawConn.RemoteAddr(),
 		Conversation: conv,
-	}, writer, rawConn, kcpSettings)
+	}, rawConn, rawConn, kcpSettings)
 
 	go fetchInput(ctx, rawConn, reader, session)
 

transport/internet/kcp/io.go

@@ -1,48 +1,12 @@
 package kcp
 
-import (
-	"crypto/cipher"
-	"crypto/rand"
-	"io"
-
-	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/buf"
-	"github.com/xtls/xray-core/transport/internet"
-)
-
 type PacketReader interface {
 	Read([]byte) []Segment
 }
 
-type PacketWriter interface {
-	Overhead() int
-	io.Writer
-}
-
-type KCPPacketReader struct {
-	Security cipher.AEAD
-	Header   internet.PacketHeader
-}
+type KCPPacketReader struct{}
 
 func (r *KCPPacketReader) Read(b []byte) []Segment {
-	if r.Header != nil {
-		if int32(len(b)) <= r.Header.Size() {
-			return nil
-		}
-		b = b[r.Header.Size():]
-	}
-	if r.Security != nil {
-		nonceSize := r.Security.NonceSize()
-		overhead := r.Security.Overhead()
-		if len(b) <= nonceSize+overhead {
-			return nil
-		}
-		out, err := r.Security.Open(b[nonceSize:nonceSize], b[:nonceSize], b[nonceSize:], nil)
-		if err != nil {
-			return nil
-		}
-		b = out
-	}
 	var result []Segment
 	for len(b) > 0 {
 		seg, x := ReadSegment(b)
@@ -54,42 +18,3 @@ func (r *KCPPacketReader) Read(b []byte) []Segment {
 	}
 	return result
 }
-
-type KCPPacketWriter struct {
-	Header   internet.PacketHeader
-	Security cipher.AEAD
-	Writer   io.Writer
-}
-
-func (w *KCPPacketWriter) Overhead() int {
-	overhead := 0
-	if w.Header != nil {
-		overhead += int(w.Header.Size())
-	}
-	if w.Security != nil {
-		overhead += w.Security.Overhead()
-	}
-	return overhead
-}
-
-func (w *KCPPacketWriter) Write(b []byte) (int, error) {
-	bb := buf.StackNew()
-	defer bb.Release()
-
-	if w.Header != nil {
-		w.Header.Serialize(bb.Extend(w.Header.Size()))
-	}
-	if w.Security != nil {
-		nonceSize := w.Security.NonceSize()
-		common.Must2(bb.ReadFullFrom(rand.Reader, int32(nonceSize)))
-		nonce := bb.BytesFrom(int32(-nonceSize))
-
-		encrypted := bb.Extend(int32(w.Security.Overhead() + len(b)))
-		w.Security.Seal(encrypted[:0], nonce, b, nil)
-	} else {
-		bb.Write(b)
-	}
-
-	_, err := w.Writer.Write(bb.Bytes())
-	return len(b), err
-}

transport/internet/kcp/io_test.go

@@ -7,9 +7,7 @@ import (
 )
 
 func TestKCPPacketReader(t *testing.T) {
-	reader := KCPPacketReader{
-		Security: &SimpleAuthenticator{},
-	}
+	reader := KCPPacketReader{}
 
 	testCases := []struct {
 		Input  []byte

transport/internet/kcp/listener.go

@@ -2,7 +2,6 @@ package kcp
 
 import (
 	"context"
-	"crypto/cipher"
 	gotls "crypto/tls"
 	"sync"
 
@@ -30,28 +29,14 @@ type Listener struct {
 	tlsConfig *gotls.Config
 	config    *Config
 	reader    PacketReader
-	header    internet.PacketHeader
-	security  cipher.AEAD
 	addConn   internet.ConnHandler
 }
 
 func NewListener(ctx context.Context, address net.Address, port net.Port, streamSettings *internet.MemoryStreamConfig, addConn internet.ConnHandler) (*Listener, error) {
 	kcpSettings := streamSettings.ProtocolSettings.(*Config)
-	header, err := kcpSettings.GetPackerHeader()
-	if err != nil {
-		return nil, errors.New("failed to create packet header").Base(err).AtError()
-	}
-	security, err := kcpSettings.GetSecurity()
-	if err != nil {
-		return nil, errors.New("failed to create security").Base(err).AtError()
-	}
+
 	l := &Listener{
-		header:   header,
-		security: security,
-		reader: &KCPPacketReader{
-			Header:   header,
-			Security: security,
-		},
+		reader:   &KCPPacketReader{},
 		sessions: make(map[ConnectionID]*Connection),
 		config:   kcpSettings,
 		addConn:  addConn,
@@ -124,11 +109,7 @@ func (l *Listener) OnReceive(payload *buf.Buffer, src net.Destination) {
 			LocalAddr:    localAddr,
 			RemoteAddr:   remoteAddr,
 			Conversation: conv,
-		}, &KCPPacketWriter{
-			Header:   l.header,
-			Security: l.security,
-			Writer:   writer,
-		}, writer, l.config)
+		}, writer, writer, l.config)
 		var netConn stat.Connection = conn
 		if l.tlsConfig != nil {
 			netConn = tls.Server(conn, l.tlsConfig)

transport/internet/udp/hub.go

@@ -25,7 +25,8 @@ func HubReceiveOriginalDestination(r bool) HubOption {
 }
 
 type Hub struct {
-	conn         *net.UDPConn
+	conn         net.PacketConn
+	udpConn      *net.UDPConn
 	cache        chan *udp.Packet
 	capacity     int
 	recvOrigDest bool
@@ -56,15 +57,27 @@ func ListenUDP(ctx context.Context, address net.Address, port net.Port, streamSe
 		hub.recvOrigDest = true
 	}
 
-	udpConn, err := internet.ListenSystemPacket(ctx, &net.UDPAddr{
+	var err error
+	hub.conn, err = internet.ListenSystemPacket(ctx, &net.UDPAddr{
 		IP:   address.IP(),
 		Port: int(port),
 	}, sockopt)
 	if err != nil {
 		return nil, err
 	}
+
+	raw := hub.conn
+
+	if streamSettings.UdpmaskManager != nil {
+		hub.conn, err = streamSettings.UdpmaskManager.WrapPacketConnServer(raw)
+		if err != nil {
+			raw.Close()
+			return nil, errors.New("mask err").Base(err)
+		}
+	}
+
 	errors.LogInfo(ctx, "listening UDP on ", address, ":", port)
-	hub.conn = udpConn.(*net.UDPConn)
+	hub.udpConn, _ = hub.conn.(*net.UDPConn)
 	hub.cache = make(chan *udp.Packet, hub.capacity)
 
 	go hub.start()
@@ -78,7 +91,7 @@ func (h *Hub) Close() error {
 }
 
 func (h *Hub) WriteTo(payload []byte, dest net.Destination) (int, error) {
-	return h.conn.WriteToUDP(payload, &net.UDPAddr{
+	return h.conn.WriteTo(payload, &net.UDPAddr{
 		IP:   dest.Address.IP(),
 		Port: int(dest.Port),
 	})
@@ -93,10 +106,21 @@ func (h *Hub) start() {
 	for {
 		buffer := buf.New()
 		var noob int
-		var addr *net.UDPAddr
+		var udpAddr *net.UDPAddr
 		rawBytes := buffer.Extend(buf.Size)
 
-		n, noob, _, addr, err := ReadUDPMsg(h.conn, rawBytes, oobBytes)
+		var n int
+		var err error
+		if h.udpConn != nil {
+			n, noob, _, udpAddr, err = ReadUDPMsg(h.udpConn, rawBytes, oobBytes)
+		} else {
+			var addr net.Addr
+			n, addr, err = h.conn.ReadFrom(rawBytes)
+			if err == nil {
+				udpAddr = addr.(*net.UDPAddr)
+			}
+		}
+
 		if err != nil {
 			errors.LogInfoInner(context.Background(), err, "failed to read UDP msg")
 			buffer.Release()
@@ -111,7 +135,7 @@ func (h *Hub) start() {
 
 		payload := &udp.Packet{
 			Payload: buffer,
-			Source:  net.UDPDestination(net.IPAddress(addr.IP), net.Port(addr.Port)),
+			Source:  net.UDPDestination(net.IPAddress(udpAddr.IP), net.Port(udpAddr.Port)),
 		}
 		if h.recvOrigDest && noob > 0 {
 			payload.Target = RetrieveOriginalDest(oobBytes[:noob])