Add gRPC Transport support (#356)

Co-authored-by: JimhHan <50871214+JimhHan@users.noreply.github.com>

common/buf/buffer.go

@@ -31,6 +31,22 @@ func New() *Buffer {
 	}
 }
 
+func NewExisted(b []byte) *Buffer {
+	if cap(b) < Size {
+		panic("Invalid buffer")
+	}
+
+	oLen := len(b)
+	if oLen < Size {
+		b = append(b, make([]byte, Size-oLen)...)
+	}
+
+	return &Buffer{
+		v:   b,
+		end: int32(oLen),
+	}
+}
+
 // StackNew creates a new Buffer object on stack.
 // This method is for buffers that is released in the same function.
 func StackNew() Buffer {

infra/conf/grpc.go

@@ -0,0 +1,16 @@
+package conf
+
+import (
+	"github.com/golang/protobuf/proto"
+
+	"github.com/xtls/xray-core/transport/internet/grpc"
+)
+
+type GRPCConfig struct {
+	ServiceName string `json:"serviceName"`
+	MultiMode   bool   `json:"multiMode"`
+}
+
+func (g GRPCConfig) Build() (proto.Message, error) {
+	return &grpc.Config{ServiceName: g.ServiceName, MultiMode: g.MultiMode}, nil
+}

infra/conf/transport.go

@@ -13,6 +13,8 @@ type TransportConfig struct {
 	HTTPConfig *HTTPConfig         `json:"httpSettings"`
 	DSConfig   *DomainSocketConfig `json:"dsSettings"`
 	QUICConfig *QUICConfig         `json:"quicSettings"`
+	GRPCConfig *GRPCConfig         `json:"grpcSettings"`
+	GUNConfig  *GRPCConfig         `json:"gunSettings"`
 }
 
 // Build implements Buildable.
@@ -85,5 +87,19 @@ func (c *TransportConfig) Build() (*global.Config, error) {
 		})
 	}
 
+	if c.GRPCConfig == nil {
+		c.GRPCConfig = c.GUNConfig
+	}
+	if c.GRPCConfig != nil {
+		gs, err := c.GRPCConfig.Build()
+		if err != nil {
+			return nil, newError("Failed to build gRPC config.").Base(err)
+		}
+		config.TransportSettings = append(config.TransportSettings, &internet.TransportConfig{
+			ProtocolName: "grpc",
+			Settings:     serial.ToTypedMessage(gs),
+		})
+	}
+
 	return config, nil
 }

infra/conf/transport_internet.go

@@ -458,6 +458,8 @@ func (p TransportProtocol) Build() (string, error) {
 		return "domainsocket", nil
 	case "quic":
 		return "quic", nil
+	case "grpc", "gun":
+		return "grpc", nil
 	default:
 		return "", newError("Config: unknown transport protocol: ", p)
 	}
@@ -534,6 +536,8 @@ type StreamConfig struct {
 	DSSettings     *DomainSocketConfig `json:"dsSettings"`
 	QUICSettings   *QUICConfig         `json:"quicSettings"`
 	SocketSettings *SocketConfig       `json:"sockopt"`
+	GRPCConfig     *GRPCConfig         `json:"grpcSettings"`
+	GUNConfig      *GRPCConfig         `json:"gunSettings"`
 }
 
 // Build implements Buildable.
@@ -643,6 +647,19 @@ func (c *StreamConfig) Build() (*internet.StreamConfig, error) {
 			Settings:     serial.ToTypedMessage(qs),
 		})
 	}
+	if c.GRPCConfig == nil {
+		c.GRPCConfig = c.GUNConfig
+	}
+	if c.GRPCConfig != nil {
+		gs, err := c.GRPCConfig.Build()
+		if err != nil {
+			return nil, newError("Failed to build gRPC config.").Base(err)
+		}
+		config.TransportSettings = append(config.TransportSettings, &internet.TransportConfig{
+			ProtocolName: "grpc",
+			Settings:     serial.ToTypedMessage(gs),
+		})
+	}
 	if c.SocketSettings != nil {
 		ss, err := c.SocketSettings.Build()
 		if err != nil {

infra/conf/transport_test.go

@@ -10,6 +10,7 @@ import (
 	. "github.com/xtls/xray-core/infra/conf"
 	"github.com/xtls/xray-core/transport/global"
 	"github.com/xtls/xray-core/transport/internet"
+	"github.com/xtls/xray-core/transport/internet/grpc"
 	"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/tls"
@@ -120,6 +121,10 @@ func TestTransportConfig(t *testing.T) {
 					"header": {
 						"type": "dtls"
 					}
+				},
+				"grpcSettings": {
+					"serviceName": "name",
+					"multiMode": true
 				}
 			}`,
 			Parser: createParser(),
@@ -190,6 +195,31 @@ func TestTransportConfig(t *testing.T) {
 							Header: serial.ToTypedMessage(&tls.PacketConfig{}),
 						}),
 					},
+					{
+						ProtocolName: "grpc",
+						Settings: serial.ToTypedMessage(&grpc.Config{
+							ServiceName: "name",
+							MultiMode:   true,
+						}),
+					},
+				},
+			},
+		},
+		{
+			Input: `{
+				"gunSettings": {
+					"serviceName": "name"
+				}
+			}`,
+			Parser: createParser(),
+			Output: &global.Config{
+				TransportSettings: []*internet.TransportConfig{
+					{
+						ProtocolName: "grpc",
+						Settings: serial.ToTypedMessage(&grpc.Config{
+							ServiceName: "name",
+						}),
+					},
 				},
 			},
 		},

main/distro/all/all.go

@@ -40,6 +40,7 @@ import (
 
 	// Transports
 	_ "github.com/xtls/xray-core/transport/internet/domainsocket"
+	_ "github.com/xtls/xray-core/transport/internet/grpc"
 	_ "github.com/xtls/xray-core/transport/internet/http"
 	_ "github.com/xtls/xray-core/transport/internet/kcp"
 	_ "github.com/xtls/xray-core/transport/internet/quic"

testing/scenarios/tls_test.go

@@ -24,6 +24,7 @@ import (
 	"github.com/xtls/xray-core/testing/servers/tcp"
 	"github.com/xtls/xray-core/testing/servers/udp"
 	"github.com/xtls/xray-core/transport/internet"
+	"github.com/xtls/xray-core/transport/internet/grpc"
 	"github.com/xtls/xray-core/transport/internet/http"
 	"github.com/xtls/xray-core/transport/internet/tls"
 	"github.com/xtls/xray-core/transport/internet/websocket"
@@ -589,3 +590,239 @@ func TestHTTP2(t *testing.T) {
 		t.Error(err)
 	}
 }
+
+func TestGRPC(t *testing.T) {
+	tcpServer := tcp.Server{
+		MsgProcessor: xor,
+	}
+	dest, err := tcpServer.Start()
+	common.Must(err)
+	defer tcpServer.Close()
+
+	userID := protocol.NewID(uuid.New())
+	serverPort := tcp.PickPort()
+	serverConfig := &core.Config{
+		Inbound: []*core.InboundHandlerConfig{
+			{
+				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
+					PortRange: net.SinglePortRange(serverPort),
+					Listen:    net.NewIPOrDomain(net.LocalHostIP),
+					StreamSettings: &internet.StreamConfig{
+						ProtocolName: "grpc",
+						TransportSettings: []*internet.TransportConfig{
+							{
+								ProtocolName: "grpc",
+								Settings:     serial.ToTypedMessage(&grpc.Config{ServiceName: "🍉"}),
+							},
+						},
+						SecurityType: serial.GetMessageType(&tls.Config{}),
+						SecuritySettings: []*serial.TypedMessage{
+							serial.ToTypedMessage(&tls.Config{
+								Certificate: []*tls.Certificate{tls.ParseCertificate(cert.MustGenerate(nil))},
+							}),
+						},
+					},
+				}),
+				ProxySettings: serial.ToTypedMessage(&inbound.Config{
+					User: []*protocol.User{
+						{
+							Account: serial.ToTypedMessage(&vmess.Account{
+								Id: userID.String(),
+							}),
+						},
+					},
+				}),
+			},
+		},
+		Outbound: []*core.OutboundHandlerConfig{
+			{
+				ProxySettings: serial.ToTypedMessage(&freedom.Config{}),
+			},
+		},
+	}
+
+	clientPort := tcp.PickPort()
+	clientConfig := &core.Config{
+		Inbound: []*core.InboundHandlerConfig{
+			{
+				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
+					PortRange: net.SinglePortRange(clientPort),
+					Listen:    net.NewIPOrDomain(net.LocalHostIP),
+				}),
+				ProxySettings: serial.ToTypedMessage(&dokodemo.Config{
+					Address: net.NewIPOrDomain(dest.Address),
+					Port:    uint32(dest.Port),
+					NetworkList: &net.NetworkList{
+						Network: []net.Network{net.Network_TCP},
+					},
+				}),
+			},
+		},
+		Outbound: []*core.OutboundHandlerConfig{
+			{
+				ProxySettings: serial.ToTypedMessage(&outbound.Config{
+					Receiver: []*protocol.ServerEndpoint{
+						{
+							Address: net.NewIPOrDomain(net.LocalHostIP),
+							Port:    uint32(serverPort),
+							User: []*protocol.User{
+								{
+									Account: serial.ToTypedMessage(&vmess.Account{
+										Id: userID.String(),
+									}),
+								},
+							},
+						},
+					},
+				}),
+				SenderSettings: serial.ToTypedMessage(&proxyman.SenderConfig{
+					StreamSettings: &internet.StreamConfig{
+						ProtocolName: "grpc",
+						TransportSettings: []*internet.TransportConfig{
+							{
+								ProtocolName: "grpc",
+								Settings:     serial.ToTypedMessage(&grpc.Config{ServiceName: "🍉"}),
+							},
+						},
+						SecurityType: serial.GetMessageType(&tls.Config{}),
+						SecuritySettings: []*serial.TypedMessage{
+							serial.ToTypedMessage(&tls.Config{
+								AllowInsecure: true,
+							}),
+						},
+					},
+				}),
+			},
+		},
+	}
+
+	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
+	common.Must(err)
+	defer CloseAllServers(servers)
+
+	var errg errgroup.Group
+	for i := 0; i < 10; i++ {
+		errg.Go(testTCPConn(clientPort, 1024*10240, time.Second*40))
+	}
+	if err := errg.Wait(); err != nil {
+		t.Error(err)
+	}
+}
+
+func TestGRPCMultiMode(t *testing.T) {
+	tcpServer := tcp.Server{
+		MsgProcessor: xor,
+	}
+	dest, err := tcpServer.Start()
+	common.Must(err)
+	defer tcpServer.Close()
+
+	userID := protocol.NewID(uuid.New())
+	serverPort := tcp.PickPort()
+	serverConfig := &core.Config{
+		Inbound: []*core.InboundHandlerConfig{
+			{
+				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
+					PortRange: net.SinglePortRange(serverPort),
+					Listen:    net.NewIPOrDomain(net.LocalHostIP),
+					StreamSettings: &internet.StreamConfig{
+						ProtocolName: "grpc",
+						TransportSettings: []*internet.TransportConfig{
+							{
+								ProtocolName: "grpc",
+								Settings:     serial.ToTypedMessage(&grpc.Config{ServiceName: "🍉"}),
+							},
+						},
+						SecurityType: serial.GetMessageType(&tls.Config{}),
+						SecuritySettings: []*serial.TypedMessage{
+							serial.ToTypedMessage(&tls.Config{
+								Certificate: []*tls.Certificate{tls.ParseCertificate(cert.MustGenerate(nil))},
+							}),
+						},
+					},
+				}),
+				ProxySettings: serial.ToTypedMessage(&inbound.Config{
+					User: []*protocol.User{
+						{
+							Account: serial.ToTypedMessage(&vmess.Account{
+								Id: userID.String(),
+							}),
+						},
+					},
+				}),
+			},
+		},
+		Outbound: []*core.OutboundHandlerConfig{
+			{
+				ProxySettings: serial.ToTypedMessage(&freedom.Config{}),
+			},
+		},
+	}
+
+	clientPort := tcp.PickPort()
+	clientConfig := &core.Config{
+		Inbound: []*core.InboundHandlerConfig{
+			{
+				ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{
+					PortRange: net.SinglePortRange(clientPort),
+					Listen:    net.NewIPOrDomain(net.LocalHostIP),
+				}),
+				ProxySettings: serial.ToTypedMessage(&dokodemo.Config{
+					Address: net.NewIPOrDomain(dest.Address),
+					Port:    uint32(dest.Port),
+					NetworkList: &net.NetworkList{
+						Network: []net.Network{net.Network_TCP},
+					},
+				}),
+			},
+		},
+		Outbound: []*core.OutboundHandlerConfig{
+			{
+				ProxySettings: serial.ToTypedMessage(&outbound.Config{
+					Receiver: []*protocol.ServerEndpoint{
+						{
+							Address: net.NewIPOrDomain(net.LocalHostIP),
+							Port:    uint32(serverPort),
+							User: []*protocol.User{
+								{
+									Account: serial.ToTypedMessage(&vmess.Account{
+										Id: userID.String(),
+									}),
+								},
+							},
+						},
+					},
+				}),
+				SenderSettings: serial.ToTypedMessage(&proxyman.SenderConfig{
+					StreamSettings: &internet.StreamConfig{
+						ProtocolName: "grpc",
+						TransportSettings: []*internet.TransportConfig{
+							{
+								ProtocolName: "grpc",
+								Settings:     serial.ToTypedMessage(&grpc.Config{ServiceName: "🍉", MultiMode: true}),
+							},
+						},
+						SecurityType: serial.GetMessageType(&tls.Config{}),
+						SecuritySettings: []*serial.TypedMessage{
+							serial.ToTypedMessage(&tls.Config{
+								AllowInsecure: true,
+							}),
+						},
+					},
+				}),
+			},
+		},
+	}
+
+	servers, err := InitializeServerConfigs(serverConfig, clientConfig)
+	common.Must(err)
+	defer CloseAllServers(servers)
+
+	var errg errgroup.Group
+	for i := 0; i < 10; i++ {
+		errg.Go(testTCPConn(clientPort, 1024*10240, time.Second*40))
+	}
+	if err := errg.Wait(); err != nil {
+		t.Error(err)
+	}
+}

transport/internet/grpc/config.go

@@ -0,0 +1,14 @@
+package grpc
+
+import (
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/transport/internet"
+)
+
+const protocolName = "grpc"
+
+func init() {
+	common.Must(internet.RegisterProtocolConfigCreator(protocolName, func() interface{} {
+		return new(Config)
+	}))
+}

transport/internet/grpc/config.pb.go

@@ -0,0 +1,172 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.25.0
+// 	protoc        v3.15.6
+// source: transport/internet/grpc/config.proto
+
+package grpc
+
+import (
+	proto "github.com/golang/protobuf/proto"
+	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)
+)
+
+// This is a compile-time assertion that a sufficiently up-to-date version
+// of the legacy proto package is being used.
+const _ = proto.ProtoPackageIsVersion4
+
+type Config struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Host        string `protobuf:"bytes,1,opt,name=host,proto3" json:"host,omitempty"`
+	ServiceName string `protobuf:"bytes,2,opt,name=service_name,json=serviceName,proto3" json:"service_name,omitempty"`
+	MultiMode   bool   `protobuf:"varint,3,opt,name=multi_mode,json=multiMode,proto3" json:"multi_mode,omitempty"`
+}
+
+func (x *Config) Reset() {
+	*x = Config{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_transport_internet_grpc_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_grpc_config_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Config.ProtoReflect.Descriptor instead.
+func (*Config) Descriptor() ([]byte, []int) {
+	return file_transport_internet_grpc_config_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Config) GetHost() string {
+	if x != nil {
+		return x.Host
+	}
+	return ""
+}
+
+func (x *Config) GetServiceName() string {
+	if x != nil {
+		return x.ServiceName
+	}
+	return ""
+}
+
+func (x *Config) GetMultiMode() bool {
+	if x != nil {
+		return x.MultiMode
+	}
+	return false
+}
+
+var File_transport_internet_grpc_config_proto protoreflect.FileDescriptor
+
+var file_transport_internet_grpc_config_proto_rawDesc = []byte{
+	0x0a, 0x24, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2f, 0x69, 0x6e, 0x74, 0x65,
+	0x72, 0x6e, 0x65, 0x74, 0x2f, 0x67, 0x72, 0x70, 0x63, 0x2f, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67,
+	0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x25, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x74, 0x72, 0x61,
+	0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2e,
+	0x67, 0x72, 0x70, 0x63, 0x2e, 0x65, 0x6e, 0x63, 0x6f, 0x64, 0x69, 0x6e, 0x67, 0x22, 0x5e, 0x0a,
+	0x06, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x12, 0x0a, 0x04, 0x68, 0x6f, 0x73, 0x74, 0x18,
+	0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x68, 0x6f, 0x73, 0x74, 0x12, 0x21, 0x0a, 0x0c, 0x73,
+	0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x5f, 0x6e, 0x61, 0x6d, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28,
+	0x09, 0x52, 0x0b, 0x73, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x4e, 0x61, 0x6d, 0x65, 0x12, 0x1d,
+	0x0a, 0x0a, 0x6d, 0x75, 0x6c, 0x74, 0x69, 0x5f, 0x6d, 0x6f, 0x64, 0x65, 0x18, 0x03, 0x20, 0x01,
+	0x28, 0x08, 0x52, 0x09, 0x6d, 0x75, 0x6c, 0x74, 0x69, 0x4d, 0x6f, 0x64, 0x65, 0x42, 0x33, 0x5a,
+	0x31, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x74, 0x6c, 0x73,
+	0x2f, 0x78, 0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x74, 0x72, 0x61, 0x6e, 0x73,
+	0x70, 0x6f, 0x72, 0x74, 0x2f, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2f, 0x67, 0x72,
+	0x70, 0x63, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_transport_internet_grpc_config_proto_rawDescOnce sync.Once
+	file_transport_internet_grpc_config_proto_rawDescData = file_transport_internet_grpc_config_proto_rawDesc
+)
+
+func file_transport_internet_grpc_config_proto_rawDescGZIP() []byte {
+	file_transport_internet_grpc_config_proto_rawDescOnce.Do(func() {
+		file_transport_internet_grpc_config_proto_rawDescData = protoimpl.X.CompressGZIP(file_transport_internet_grpc_config_proto_rawDescData)
+	})
+	return file_transport_internet_grpc_config_proto_rawDescData
+}
+
+var file_transport_internet_grpc_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_transport_internet_grpc_config_proto_goTypes = []interface{}{
+	(*Config)(nil), // 0: xray.transport.internet.grpc.encoding.Config
+}
+var file_transport_internet_grpc_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_grpc_config_proto_init() }
+func file_transport_internet_grpc_config_proto_init() {
+	if File_transport_internet_grpc_config_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_transport_internet_grpc_config_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Config); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_transport_internet_grpc_config_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_transport_internet_grpc_config_proto_goTypes,
+		DependencyIndexes: file_transport_internet_grpc_config_proto_depIdxs,
+		MessageInfos:      file_transport_internet_grpc_config_proto_msgTypes,
+	}.Build()
+	File_transport_internet_grpc_config_proto = out.File
+	file_transport_internet_grpc_config_proto_rawDesc = nil
+	file_transport_internet_grpc_config_proto_goTypes = nil
+	file_transport_internet_grpc_config_proto_depIdxs = nil
+}

transport/internet/grpc/config.proto

@@ -0,0 +1,10 @@
+syntax = "proto3";
+
+package xray.transport.internet.grpc.encoding;
+option go_package = "github.com/xtls/xray-core/transport/internet/grpc";
+
+message Config {
+  string host = 1;
+  string service_name = 2;
+  bool multi_mode = 3;
+}

transport/internet/grpc/dial.go

@@ -0,0 +1,130 @@
+package grpc
+
+import (
+	"context"
+	gonet "net"
+	"sync"
+	"time"
+
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/backoff"
+	"google.golang.org/grpc/connectivity"
+	"google.golang.org/grpc/credentials"
+
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/transport/internet"
+	"github.com/xtls/xray-core/transport/internet/grpc/encoding"
+	"github.com/xtls/xray-core/transport/internet/tls"
+)
+
+func Dial(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) (internet.Connection, error) {
+	newError("creating connection to ", dest).WriteToLog(session.ExportIDToError(ctx))
+
+	conn, err := dialgRPC(ctx, dest, streamSettings)
+	if err != nil {
+		return nil, newError("failed to dial gRPC").Base(err)
+	}
+	return internet.Connection(conn), nil
+}
+
+func init() {
+	common.Must(internet.RegisterTransportDialer(protocolName, Dial))
+}
+
+type dialerConf struct {
+	net.Destination
+	*internet.SocketConfig
+}
+
+var (
+	globalDialerMap    map[dialerConf]*grpc.ClientConn
+	globalDialerAccess sync.Mutex
+)
+
+func dialgRPC(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) (net.Conn, error) {
+	grpcSettings := streamSettings.ProtocolSettings.(*Config)
+
+	config := tls.ConfigFromStreamSettings(streamSettings)
+	var dialOption = grpc.WithInsecure()
+
+	if config != nil {
+		dialOption = grpc.WithTransportCredentials(credentials.NewTLS(config.GetTLSConfig()))
+	}
+
+	conn, err := getGrpcClient(ctx, dest, dialOption, streamSettings.SocketSettings)
+
+	if err != nil {
+		return nil, newError("Cannot dial gRPC").Base(err)
+	}
+	client := encoding.NewGRPCServiceClient(conn)
+	if grpcSettings.MultiMode {
+		newError("using gRPC multi mode").AtDebug().WriteToLog()
+		grpcService, err := client.(encoding.GRPCServiceClientX).TunMultiCustomName(ctx, grpcSettings.ServiceName)
+		if err != nil {
+			return nil, newError("Cannot dial gRPC").Base(err)
+		}
+		return encoding.NewMultiHunkConn(grpcService, nil), nil
+	}
+
+	grpcService, err := client.(encoding.GRPCServiceClientX).TunCustomName(ctx, grpcSettings.ServiceName)
+	if err != nil {
+		return nil, newError("Cannot dial gRPC").Base(err)
+	}
+
+	return encoding.NewHunkConn(grpcService, nil), nil
+}
+
+func getGrpcClient(ctx context.Context, dest net.Destination, dialOption grpc.DialOption, sockopt *internet.SocketConfig) (*grpc.ClientConn, error) {
+	globalDialerAccess.Lock()
+	defer globalDialerAccess.Unlock()
+
+	if globalDialerMap == nil {
+		globalDialerMap = make(map[dialerConf]*grpc.ClientConn)
+	}
+
+	if client, found := globalDialerMap[dialerConf{dest, sockopt}]; found && client.GetState() != connectivity.Shutdown {
+		return client, nil
+	}
+
+	conn, err := grpc.Dial(
+		gonet.JoinHostPort(dest.Address.String(), dest.Port.String()),
+		dialOption,
+		grpc.WithConnectParams(grpc.ConnectParams{
+			Backoff: backoff.Config{
+				BaseDelay:  500 * time.Millisecond,
+				Multiplier: 1.5,
+				Jitter:     0.2,
+				MaxDelay:   19 * time.Second,
+			},
+			MinConnectTimeout: 5 * time.Second,
+		}),
+		grpc.WithContextDialer(func(gctx context.Context, s string) (gonet.Conn, error) {
+			gctx = session.ContextWithID(gctx, session.IDFromContext(ctx))
+			gctx = session.ContextWithOutbound(gctx, session.OutboundFromContext(ctx))
+
+			rawHost, rawPort, err := net.SplitHostPort(s)
+			select {
+			case <-gctx.Done():
+				return nil, gctx.Err()
+			default:
+			}
+
+			if err != nil {
+				return nil, err
+			}
+			if len(rawPort) == 0 {
+				rawPort = "443"
+			}
+			port, err := net.PortFromString(rawPort)
+			if err != nil {
+				return nil, err
+			}
+			address := net.ParseAddress(rawHost)
+			return internet.DialSystem(gctx, net.TCPDestination(address, port), sockopt)
+		}),
+	)
+	globalDialerMap[dialerConf{dest, sockopt}] = conn
+	return conn, err
+}

transport/internet/grpc/encoding/customSeviceName.go

@@ -0,0 +1,60 @@
+package encoding
+
+import (
+	"context"
+
+	"google.golang.org/grpc"
+)
+
+func ServerDesc(name string) grpc.ServiceDesc {
+	return grpc.ServiceDesc{
+		ServiceName: name,
+		HandlerType: (*GRPCServiceServer)(nil),
+		Methods:     []grpc.MethodDesc{},
+		Streams: []grpc.StreamDesc{
+			{
+				StreamName:    "Tun",
+				Handler:       _GRPCService_Tun_Handler,
+				ServerStreams: true,
+				ClientStreams: true,
+			},
+			{
+				StreamName:    "TunMulti",
+				Handler:       _GRPCService_TunMulti_Handler,
+				ServerStreams: true,
+				ClientStreams: true,
+			},
+		},
+		Metadata: "grpc.proto",
+	}
+}
+
+func (c *gRPCServiceClient) TunCustomName(ctx context.Context, name string, opts ...grpc.CallOption) (GRPCService_TunClient, error) {
+	stream, err := c.cc.NewStream(ctx, &ServerDesc(name).Streams[0], "/"+name+"/Tun", opts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &gRPCServiceTunClient{stream}
+	return x, nil
+}
+
+func (c *gRPCServiceClient) TunMultiCustomName(ctx context.Context, name string, opts ...grpc.CallOption) (GRPCService_TunMultiClient, error) {
+	stream, err := c.cc.NewStream(ctx, &ServerDesc(name).Streams[0], "/"+name+"/TunMulti", opts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &gRPCServiceTunMultiClient{stream}
+	return x, nil
+}
+
+type GRPCServiceClientX interface {
+	TunCustomName(ctx context.Context, name string, opts ...grpc.CallOption) (GRPCService_TunClient, error)
+	TunMultiCustomName(ctx context.Context, name string, opts ...grpc.CallOption) (GRPCService_TunMultiClient, error)
+	Tun(ctx context.Context, opts ...grpc.CallOption) (GRPCService_TunClient, error)
+	TunMulti(ctx context.Context, opts ...grpc.CallOption) (GRPCService_TunMultiClient, error)
+}
+
+func RegisterGRPCServiceServerX(s *grpc.Server, srv GRPCServiceServer, name string) {
+	desc := ServerDesc(name)
+	s.RegisterService(&desc, srv)
+}

transport/internet/grpc/encoding/encoding.go

@@ -0,0 +1,3 @@
+package encoding
+
+//go:generate go run github.com/xtls/xray-core/common/errors/errorgen

transport/internet/grpc/encoding/errors.generated.go

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

transport/internet/grpc/encoding/hunkconn.go

@@ -0,0 +1,123 @@
+package encoding
+
+import (
+	"context"
+	"io"
+	"net"
+
+	"github.com/xtls/xray-core/common/buf"
+	"github.com/xtls/xray-core/common/net/cnc"
+	"github.com/xtls/xray-core/common/signal/done"
+)
+
+type HunkConn interface {
+	Send(*Hunk) error
+	Recv() (*Hunk, error)
+	SendMsg(m interface{}) error
+	RecvMsg(m interface{}) error
+}
+
+type StreamCloser interface {
+	CloseSend() error
+}
+
+type HunkReaderWriter struct {
+	hc     HunkConn
+	cancel context.CancelFunc
+	done   *done.Instance
+
+	buf   []byte
+	index int
+}
+
+func NewHunkReadWriter(hc HunkConn, cancel context.CancelFunc) *HunkReaderWriter {
+	return &HunkReaderWriter{hc, cancel, done.New(), nil, 0}
+}
+
+func NewHunkConn(hc HunkConn, cancel context.CancelFunc) net.Conn {
+	wrc := NewHunkReadWriter(hc, cancel)
+	return cnc.NewConnection(
+		cnc.ConnectionInput(wrc),
+		cnc.ConnectionOutput(wrc),
+		cnc.ConnectionOnClose(wrc),
+	)
+}
+
+func (h *HunkReaderWriter) forceFetch() error {
+	hunk, err := h.hc.Recv()
+	if err != nil {
+		if err == io.EOF {
+			return err
+		}
+
+		return newError("failed to fetch hunk from gRPC tunnel").Base(err)
+	}
+
+	h.buf = hunk.Data
+	h.index = 0
+
+	return nil
+}
+
+func (h *HunkReaderWriter) Read(buf []byte) (int, error) {
+	if h.done.Done() {
+		return 0, io.EOF
+	}
+
+	if h.index >= len(h.buf) {
+		if err := h.forceFetch(); err != nil {
+			return 0, err
+		}
+	}
+	n := copy(buf, h.buf[h.index:])
+	h.index += n
+
+	return n, nil
+}
+
+func (h *HunkReaderWriter) ReadMultiBuffer() (buf.MultiBuffer, error) {
+	if h.done.Done() {
+		return nil, io.EOF
+	}
+	if h.index >= len(h.buf) {
+		if err := h.forceFetch(); err != nil {
+			return nil, err
+		}
+	}
+
+	if cap(h.buf) == buf.Size {
+		b := h.buf
+		h.index = len(h.buf)
+		return buf.MultiBuffer{buf.NewExisted(b)}, nil
+	}
+
+	b := buf.New()
+	_, err := b.ReadFrom(h)
+	if err != nil {
+		return nil, err
+	}
+	return buf.MultiBuffer{b}, nil
+}
+
+func (h *HunkReaderWriter) Write(buf []byte) (int, error) {
+	if h.done.Done() {
+		return 0, io.ErrClosedPipe
+	}
+
+	err := h.hc.Send(&Hunk{Data: buf[:]})
+	if err != nil {
+		return 0, newError("failed to send data over gRPC tunnel").Base(err)
+	}
+	return len(buf), nil
+}
+
+func (h *HunkReaderWriter) Close() error {
+	if h.cancel != nil {
+		h.cancel()
+	}
+	if sc, match := h.hc.(StreamCloser); match {
+		return sc.CloseSend()
+	}
+
+	return h.done.Close()
+}

transport/internet/grpc/encoding/multiconn.go

@@ -0,0 +1,108 @@
+package encoding
+
+import (
+	"context"
+	"io"
+	"net"
+
+	"github.com/xtls/xray-core/common/buf"
+	"github.com/xtls/xray-core/common/net/cnc"
+	"github.com/xtls/xray-core/common/signal/done"
+)
+
+type MultiHunkConn interface {
+	Send(*MultiHunk) error
+	Recv() (*MultiHunk, error)
+	SendMsg(m interface{}) error
+	RecvMsg(m interface{}) error
+}
+
+type MultiHunkReaderWriter struct {
+	hc     MultiHunkConn
+	cancel context.CancelFunc
+	done   *done.Instance
+
+	buf [][]byte
+}
+
+func NewMultiHunkReadWriter(hc MultiHunkConn, cancel context.CancelFunc) *MultiHunkReaderWriter {
+	return &MultiHunkReaderWriter{hc, cancel, done.New(), nil}
+}
+
+func NewMultiHunkConn(hc MultiHunkConn, cancel context.CancelFunc) net.Conn {
+	wrc := NewMultiHunkReadWriter(hc, cancel)
+	return cnc.NewConnection(
+		cnc.ConnectionInputMulti(wrc),
+		cnc.ConnectionOutputMulti(wrc),
+		cnc.ConnectionOnClose(wrc),
+	)
+}
+
+func (h *MultiHunkReaderWriter) forceFetch() error {
+	hunk, err := h.hc.Recv()
+	if err != nil {
+		if err == io.EOF {
+			return err
+		}
+
+		return newError("failed to fetch hunk from gRPC tunnel").Base(err)
+	}
+
+	h.buf = hunk.Data
+
+	return nil
+}
+
+func (h *MultiHunkReaderWriter) ReadMultiBuffer() (buf.MultiBuffer, error) {
+	if h.done.Done() {
+		return nil, io.EOF
+	}
+
+	if err := h.forceFetch(); err != nil {
+		return nil, err
+	}
+
+	var mb = make(buf.MultiBuffer, 0, len(h.buf))
+	for _, b := range h.buf {
+		if cap(b) >= buf.Size {
+			mb = append(mb, buf.NewExisted(b))
+			continue
+		}
+
+		nb := buf.New()
+		nb.Extend(int32(len(b)))
+		copy(nb.Bytes(), b)
+
+		mb = append(mb, nb)
+	}
+	return mb, nil
+}
+
+func (h *MultiHunkReaderWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
+	defer buf.ReleaseMulti(mb)
+	if h.done.Done() {
+		return io.ErrClosedPipe
+	}
+
+	hunk := &MultiHunk{Data: make([][]byte, len(mb))}
+	for _, b := range mb {
+		hunk.Data = append(hunk.Data, b.Bytes())
+	}
+
+	err := h.hc.Send(hunk)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (h *MultiHunkReaderWriter) Close() error {
+	if h.cancel != nil {
+		h.cancel()
+	}
+	if sc, match := h.hc.(StreamCloser); match {
+		return sc.CloseSend()
+	}
+
+	return h.done.Close()
+}

transport/internet/grpc/encoding/stream.pb.go

@@ -0,0 +1,234 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.25.0
+// 	protoc        v3.15.6
+// source: transport/internet/grpc/encoding/stream.proto
+
+package encoding
+
+import (
+	proto "github.com/golang/protobuf/proto"
+	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)
+)
+
+// This is a compile-time assertion that a sufficiently up-to-date version
+// of the legacy proto package is being used.
+const _ = proto.ProtoPackageIsVersion4
+
+type Hunk struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Data []byte `protobuf:"bytes,1,opt,name=data,proto3" json:"data,omitempty"`
+}
+
+func (x *Hunk) Reset() {
+	*x = Hunk{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_transport_internet_grpc_encoding_stream_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Hunk) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Hunk) ProtoMessage() {}
+
+func (x *Hunk) ProtoReflect() protoreflect.Message {
+	mi := &file_transport_internet_grpc_encoding_stream_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Hunk.ProtoReflect.Descriptor instead.
+func (*Hunk) Descriptor() ([]byte, []int) {
+	return file_transport_internet_grpc_encoding_stream_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Hunk) GetData() []byte {
+	if x != nil {
+		return x.Data
+	}
+	return nil
+}
+
+type MultiHunk struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Data [][]byte `protobuf:"bytes,1,rep,name=data,proto3" json:"data,omitempty"`
+}
+
+func (x *MultiHunk) Reset() {
+	*x = MultiHunk{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_transport_internet_grpc_encoding_stream_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *MultiHunk) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*MultiHunk) ProtoMessage() {}
+
+func (x *MultiHunk) ProtoReflect() protoreflect.Message {
+	mi := &file_transport_internet_grpc_encoding_stream_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use MultiHunk.ProtoReflect.Descriptor instead.
+func (*MultiHunk) Descriptor() ([]byte, []int) {
+	return file_transport_internet_grpc_encoding_stream_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *MultiHunk) GetData() [][]byte {
+	if x != nil {
+		return x.Data
+	}
+	return nil
+}
+
+var File_transport_internet_grpc_encoding_stream_proto protoreflect.FileDescriptor
+
+var file_transport_internet_grpc_encoding_stream_proto_rawDesc = []byte{
+	0x0a, 0x2d, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2f, 0x69, 0x6e, 0x74, 0x65,
+	0x72, 0x6e, 0x65, 0x74, 0x2f, 0x67, 0x72, 0x70, 0x63, 0x2f, 0x65, 0x6e, 0x63, 0x6f, 0x64, 0x69,
+	0x6e, 0x67, 0x2f, 0x73, 0x74, 0x72, 0x65, 0x61, 0x6d, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12,
+	0x25, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e,
+	0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2e, 0x67, 0x72, 0x70, 0x63, 0x2e, 0x65, 0x6e,
+	0x63, 0x6f, 0x64, 0x69, 0x6e, 0x67, 0x22, 0x1a, 0x0a, 0x04, 0x48, 0x75, 0x6e, 0x6b, 0x12, 0x12,
+	0x0a, 0x04, 0x64, 0x61, 0x74, 0x61, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x04, 0x64, 0x61,
+	0x74, 0x61, 0x22, 0x1f, 0x0a, 0x09, 0x4d, 0x75, 0x6c, 0x74, 0x69, 0x48, 0x75, 0x6e, 0x6b, 0x12,
+	0x12, 0x0a, 0x04, 0x64, 0x61, 0x74, 0x61, 0x18, 0x01, 0x20, 0x03, 0x28, 0x0c, 0x52, 0x04, 0x64,
+	0x61, 0x74, 0x61, 0x32, 0xe6, 0x01, 0x0a, 0x0b, 0x47, 0x52, 0x50, 0x43, 0x53, 0x65, 0x72, 0x76,
+	0x69, 0x63, 0x65, 0x12, 0x63, 0x0a, 0x03, 0x54, 0x75, 0x6e, 0x12, 0x2b, 0x2e, 0x78, 0x72, 0x61,
+	0x79, 0x2e, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x69, 0x6e, 0x74, 0x65,
+	0x72, 0x6e, 0x65, 0x74, 0x2e, 0x67, 0x72, 0x70, 0x63, 0x2e, 0x65, 0x6e, 0x63, 0x6f, 0x64, 0x69,
+	0x6e, 0x67, 0x2e, 0x48, 0x75, 0x6e, 0x6b, 0x1a, 0x2b, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x74,
+	0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65,
+	0x74, 0x2e, 0x67, 0x72, 0x70, 0x63, 0x2e, 0x65, 0x6e, 0x63, 0x6f, 0x64, 0x69, 0x6e, 0x67, 0x2e,
+	0x48, 0x75, 0x6e, 0x6b, 0x28, 0x01, 0x30, 0x01, 0x12, 0x72, 0x0a, 0x08, 0x54, 0x75, 0x6e, 0x4d,
+	0x75, 0x6c, 0x74, 0x69, 0x12, 0x30, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x74, 0x72, 0x61, 0x6e,
+	0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2e, 0x67,
+	0x72, 0x70, 0x63, 0x2e, 0x65, 0x6e, 0x63, 0x6f, 0x64, 0x69, 0x6e, 0x67, 0x2e, 0x4d, 0x75, 0x6c,
+	0x74, 0x69, 0x48, 0x75, 0x6e, 0x6b, 0x1a, 0x30, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x74, 0x72,
+	0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74,
+	0x2e, 0x67, 0x72, 0x70, 0x63, 0x2e, 0x65, 0x6e, 0x63, 0x6f, 0x64, 0x69, 0x6e, 0x67, 0x2e, 0x4d,
+	0x75, 0x6c, 0x74, 0x69, 0x48, 0x75, 0x6e, 0x6b, 0x28, 0x01, 0x30, 0x01, 0x42, 0x3c, 0x5a, 0x3a,
+	0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x74, 0x6c, 0x73, 0x2f,
+	0x78, 0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70,
+	0x6f, 0x72, 0x74, 0x2f, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2f, 0x67, 0x72, 0x70,
+	0x63, 0x2f, 0x65, 0x6e, 0x63, 0x6f, 0x64, 0x69, 0x6e, 0x67, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x33,
+}
+
+var (
+	file_transport_internet_grpc_encoding_stream_proto_rawDescOnce sync.Once
+	file_transport_internet_grpc_encoding_stream_proto_rawDescData = file_transport_internet_grpc_encoding_stream_proto_rawDesc
+)
+
+func file_transport_internet_grpc_encoding_stream_proto_rawDescGZIP() []byte {
+	file_transport_internet_grpc_encoding_stream_proto_rawDescOnce.Do(func() {
+		file_transport_internet_grpc_encoding_stream_proto_rawDescData = protoimpl.X.CompressGZIP(file_transport_internet_grpc_encoding_stream_proto_rawDescData)
+	})
+	return file_transport_internet_grpc_encoding_stream_proto_rawDescData
+}
+
+var file_transport_internet_grpc_encoding_stream_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
+var file_transport_internet_grpc_encoding_stream_proto_goTypes = []interface{}{
+	(*Hunk)(nil),      // 0: xray.transport.internet.grpc.encoding.Hunk
+	(*MultiHunk)(nil), // 1: xray.transport.internet.grpc.encoding.MultiHunk
+}
+var file_transport_internet_grpc_encoding_stream_proto_depIdxs = []int32{
+	0, // 0: xray.transport.internet.grpc.encoding.GRPCService.Tun:input_type -> xray.transport.internet.grpc.encoding.Hunk
+	1, // 1: xray.transport.internet.grpc.encoding.GRPCService.TunMulti:input_type -> xray.transport.internet.grpc.encoding.MultiHunk
+	0, // 2: xray.transport.internet.grpc.encoding.GRPCService.Tun:output_type -> xray.transport.internet.grpc.encoding.Hunk
+	1, // 3: xray.transport.internet.grpc.encoding.GRPCService.TunMulti:output_type -> xray.transport.internet.grpc.encoding.MultiHunk
+	2, // [2:4] is the sub-list for method output_type
+	0, // [0:2] 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_grpc_encoding_stream_proto_init() }
+func file_transport_internet_grpc_encoding_stream_proto_init() {
+	if File_transport_internet_grpc_encoding_stream_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_transport_internet_grpc_encoding_stream_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Hunk); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_transport_internet_grpc_encoding_stream_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*MultiHunk); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_transport_internet_grpc_encoding_stream_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   2,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_transport_internet_grpc_encoding_stream_proto_goTypes,
+		DependencyIndexes: file_transport_internet_grpc_encoding_stream_proto_depIdxs,
+		MessageInfos:      file_transport_internet_grpc_encoding_stream_proto_msgTypes,
+	}.Build()
+	File_transport_internet_grpc_encoding_stream_proto = out.File
+	file_transport_internet_grpc_encoding_stream_proto_rawDesc = nil
+	file_transport_internet_grpc_encoding_stream_proto_goTypes = nil
+	file_transport_internet_grpc_encoding_stream_proto_depIdxs = nil
+}

transport/internet/grpc/encoding/stream.proto

@@ -0,0 +1,17 @@
+syntax = "proto3";
+
+package xray.transport.internet.grpc.encoding;
+option go_package = "github.com/xtls/xray-core/transport/internet/grpc/encoding";
+
+message Hunk {
+  bytes data = 1;
+}
+
+message MultiHunk {
+   repeated bytes data = 1;
+}
+
+service GRPCService {
+  rpc Tun (stream Hunk) returns (stream Hunk);
+  rpc TunMulti (stream MultiHunk) returns (stream MultiHunk);
+}

transport/internet/grpc/encoding/stream_grpc.pb.go

@@ -0,0 +1,201 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+
+package encoding
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.32.0 or later.
+const _ = grpc.SupportPackageIsVersion7
+
+// GRPCServiceClient is the client API for GRPCService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type GRPCServiceClient interface {
+	Tun(ctx context.Context, opts ...grpc.CallOption) (GRPCService_TunClient, error)
+	TunMulti(ctx context.Context, opts ...grpc.CallOption) (GRPCService_TunMultiClient, error)
+}
+
+type gRPCServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewGRPCServiceClient(cc grpc.ClientConnInterface) GRPCServiceClient {
+	return &gRPCServiceClient{cc}
+}
+
+func (c *gRPCServiceClient) Tun(ctx context.Context, opts ...grpc.CallOption) (GRPCService_TunClient, error) {
+	stream, err := c.cc.NewStream(ctx, &GRPCService_ServiceDesc.Streams[0], "/xray.transport.internet.grpc.encoding.GRPCService/Tun", opts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &gRPCServiceTunClient{stream}
+	return x, nil
+}
+
+type GRPCService_TunClient interface {
+	Send(*Hunk) error
+	Recv() (*Hunk, error)
+	grpc.ClientStream
+}
+
+type gRPCServiceTunClient struct {
+	grpc.ClientStream
+}
+
+func (x *gRPCServiceTunClient) Send(m *Hunk) error {
+	return x.ClientStream.SendMsg(m)
+}
+
+func (x *gRPCServiceTunClient) Recv() (*Hunk, error) {
+	m := new(Hunk)
+	if err := x.ClientStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+func (c *gRPCServiceClient) TunMulti(ctx context.Context, opts ...grpc.CallOption) (GRPCService_TunMultiClient, error) {
+	stream, err := c.cc.NewStream(ctx, &GRPCService_ServiceDesc.Streams[1], "/xray.transport.internet.grpc.encoding.GRPCService/TunMulti", opts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &gRPCServiceTunMultiClient{stream}
+	return x, nil
+}
+
+type GRPCService_TunMultiClient interface {
+	Send(*MultiHunk) error
+	Recv() (*MultiHunk, error)
+	grpc.ClientStream
+}
+
+type gRPCServiceTunMultiClient struct {
+	grpc.ClientStream
+}
+
+func (x *gRPCServiceTunMultiClient) Send(m *MultiHunk) error {
+	return x.ClientStream.SendMsg(m)
+}
+
+func (x *gRPCServiceTunMultiClient) Recv() (*MultiHunk, error) {
+	m := new(MultiHunk)
+	if err := x.ClientStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+// GRPCServiceServer is the server API for GRPCService service.
+// All implementations must embed UnimplementedGRPCServiceServer
+// for forward compatibility
+type GRPCServiceServer interface {
+	Tun(GRPCService_TunServer) error
+	TunMulti(GRPCService_TunMultiServer) error
+	mustEmbedUnimplementedGRPCServiceServer()
+}
+
+// UnimplementedGRPCServiceServer must be embedded to have forward compatible implementations.
+type UnimplementedGRPCServiceServer struct {
+}
+
+func (UnimplementedGRPCServiceServer) Tun(GRPCService_TunServer) error {
+	return status.Errorf(codes.Unimplemented, "method Tun not implemented")
+}
+func (UnimplementedGRPCServiceServer) TunMulti(GRPCService_TunMultiServer) error {
+	return status.Errorf(codes.Unimplemented, "method TunMulti not implemented")
+}
+func (UnimplementedGRPCServiceServer) mustEmbedUnimplementedGRPCServiceServer() {}
+
+// UnsafeGRPCServiceServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to GRPCServiceServer will
+// result in compilation errors.
+type UnsafeGRPCServiceServer interface {
+	mustEmbedUnimplementedGRPCServiceServer()
+}
+
+func RegisterGRPCServiceServer(s grpc.ServiceRegistrar, srv GRPCServiceServer) {
+	s.RegisterService(&GRPCService_ServiceDesc, srv)
+}
+
+func _GRPCService_Tun_Handler(srv interface{}, stream grpc.ServerStream) error {
+	return srv.(GRPCServiceServer).Tun(&gRPCServiceTunServer{stream})
+}
+
+type GRPCService_TunServer interface {
+	Send(*Hunk) error
+	Recv() (*Hunk, error)
+	grpc.ServerStream
+}
+
+type gRPCServiceTunServer struct {
+	grpc.ServerStream
+}
+
+func (x *gRPCServiceTunServer) Send(m *Hunk) error {
+	return x.ServerStream.SendMsg(m)
+}
+
+func (x *gRPCServiceTunServer) Recv() (*Hunk, error) {
+	m := new(Hunk)
+	if err := x.ServerStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+func _GRPCService_TunMulti_Handler(srv interface{}, stream grpc.ServerStream) error {
+	return srv.(GRPCServiceServer).TunMulti(&gRPCServiceTunMultiServer{stream})
+}
+
+type GRPCService_TunMultiServer interface {
+	Send(*MultiHunk) error
+	Recv() (*MultiHunk, error)
+	grpc.ServerStream
+}
+
+type gRPCServiceTunMultiServer struct {
+	grpc.ServerStream
+}
+
+func (x *gRPCServiceTunMultiServer) Send(m *MultiHunk) error {
+	return x.ServerStream.SendMsg(m)
+}
+
+func (x *gRPCServiceTunMultiServer) Recv() (*MultiHunk, error) {
+	m := new(MultiHunk)
+	if err := x.ServerStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+// GRPCService_ServiceDesc is the grpc.ServiceDesc for GRPCService service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var GRPCService_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "xray.transport.internet.grpc.encoding.GRPCService",
+	HandlerType: (*GRPCServiceServer)(nil),
+	Methods:     []grpc.MethodDesc{},
+	Streams: []grpc.StreamDesc{
+		{
+			StreamName:    "Tun",
+			Handler:       _GRPCService_Tun_Handler,
+			ServerStreams: true,
+			ClientStreams: true,
+		},
+		{
+			StreamName:    "TunMulti",
+			Handler:       _GRPCService_TunMulti_Handler,
+			ServerStreams: true,
+			ClientStreams: true,
+		},
+	},
+	Metadata: "transport/internet/grpc/encoding/stream.proto",
+}

transport/internet/grpc/errors.generated.go

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

transport/internet/grpc/grpc.go

@@ -0,0 +1,3 @@
+package grpc
+
+//go:generate go run github.com/xtls/xray-core/common/errors/errorgen

transport/internet/grpc/hub.go

@@ -0,0 +1,129 @@
+package grpc
+
+import (
+	"context"
+
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials"
+
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/transport/internet"
+	"github.com/xtls/xray-core/transport/internet/grpc/encoding"
+	"github.com/xtls/xray-core/transport/internet/tls"
+)
+
+type Listener struct {
+	encoding.UnimplementedGRPCServiceServer
+	ctx     context.Context
+	handler internet.ConnHandler
+	local   net.Addr
+	config  *Config
+	locker  *internet.FileLocker // for unix domain socket
+
+	s *grpc.Server
+}
+
+func (l Listener) Tun(server encoding.GRPCService_TunServer) error {
+	tunCtx, cancel := context.WithCancel(l.ctx)
+	l.handler(encoding.NewHunkConn(server, cancel))
+	<-tunCtx.Done()
+	return nil
+}
+
+func (l Listener) TunMulti(server encoding.GRPCService_TunMultiServer) error {
+	tunCtx, cancel := context.WithCancel(l.ctx)
+	l.handler(encoding.NewMultiHunkConn(server, cancel))
+	<-tunCtx.Done()
+	return nil
+}
+
+func (l Listener) Close() error {
+	l.s.Stop()
+	return nil
+}
+
+func (l Listener) Addr() net.Addr {
+	return l.local
+}
+
+func Listen(ctx context.Context, address net.Address, port net.Port, settings *internet.MemoryStreamConfig, handler internet.ConnHandler) (internet.Listener, error) {
+	grpcSettings := settings.ProtocolSettings.(*Config)
+	var listener *Listener
+	if port == net.Port(0) { // unix
+		listener = &Listener{
+			handler: handler,
+			local: &net.UnixAddr{
+				Name: address.Domain(),
+				Net:  "unix",
+			},
+			config: grpcSettings,
+		}
+	} else { // tcp
+		listener = &Listener{
+			handler: handler,
+			local: &net.TCPAddr{
+				IP:   address.IP(),
+				Port: int(port),
+			},
+			config: grpcSettings,
+		}
+	}
+
+	listener.ctx = ctx
+
+	config := tls.ConfigFromStreamSettings(settings)
+
+	var s *grpc.Server
+	if config == nil {
+		s = grpc.NewServer()
+	} else {
+		s = grpc.NewServer(grpc.Creds(credentials.NewTLS(config.GetTLSConfig(tls.WithNextProto("h2")))))
+	}
+	listener.s = s
+
+	if settings.SocketSettings != nil && settings.SocketSettings.AcceptProxyProtocol {
+		newError("accepting PROXY protocol").AtWarning().WriteToLog(session.ExportIDToError(ctx))
+	}
+
+	go func() {
+		var streamListener net.Listener
+		var err error
+		if port == net.Port(0) { // unix
+			streamListener, err = internet.ListenSystem(ctx, &net.UnixAddr{
+				Name: address.Domain(),
+				Net:  "unix",
+			}, settings.SocketSettings)
+			if err != nil {
+				newError("failed to listen on ", address).Base(err).AtError().WriteToLog(session.ExportIDToError(ctx))
+				return
+			}
+			locker := ctx.Value(address.Domain())
+			if locker != nil {
+				listener.locker = locker.(*internet.FileLocker)
+			}
+		} else { // tcp
+			streamListener, err = internet.ListenSystem(ctx, &net.TCPAddr{
+				IP:   address.IP(),
+				Port: int(port),
+			}, settings.SocketSettings)
+			if err != nil {
+				newError("failed to listen on ", address, ":", port).Base(err).AtError().WriteToLog(session.ExportIDToError(ctx))
+				return
+			}
+		}
+
+		encoding.RegisterGRPCServiceServerX(s, listener, grpcSettings.ServiceName)
+
+		if err = s.Serve(streamListener); err != nil {
+			newError("Listener for gRPC ended").Base(err).WriteToLog()
+		}
+	}()
+
+	return listener, nil
+}
+
+func init() {
+	common.Must(internet.RegisterTransportListener(protocolName, Listen))
+}

transport/internet/http/dialer.go

@@ -18,8 +18,13 @@ import (
 	"golang.org/x/net/http2"
 )
 
+type dialerConf struct {
+	net.Destination
+	*internet.SocketConfig
+}
+
 var (
-	globalDialerMap    map[net.Destination]*http.Client
+	globalDialerMap    map[dialerConf]*http.Client
 	globalDialerAccess sync.Mutex
 )
 
@@ -28,10 +33,10 @@ func getHTTPClient(ctx context.Context, dest net.Destination, tlsSettings *tls.C
 	defer globalDialerAccess.Unlock()
 
 	if globalDialerMap == nil {
-		globalDialerMap = make(map[net.Destination]*http.Client)
+		globalDialerMap = make(map[dialerConf]*http.Client)
 	}
 
-	if client, found := globalDialerMap[dest]; found {
+	if client, found := globalDialerMap[dialerConf{dest, sockopt}]; found {
 		return client, nil
 	}
 
@@ -87,7 +92,7 @@ func getHTTPClient(ctx context.Context, dest net.Destination, tlsSettings *tls.C
 		Transport: transport,
 	}
 
-	globalDialerMap[dest] = client
+	globalDialerMap[dialerConf{dest, sockopt}] = client
 	return client, nil
 }