Introduce Packet to unify TCP and UDP communication

common/net/packet.go

@@ -0,0 +1,53 @@
+package net
+
+type Packet interface {
+	Destination() Destination
+	Chunk() []byte // First chunk of this commnunication
+	MoreChunks() bool
+}
+
+func NewTCPPacket(dest Destination) *TCPPacket {
+	return &TCPPacket{
+		basePacket: basePacket{destination: dest},
+	}
+}
+
+func NewUDPPacket(dest Destination, data []byte) *UDPPacket {
+	return &UDPPacket{
+		basePacket: basePacket{destination: dest},
+		data:       data,
+	}
+}
+
+type basePacket struct {
+	destination Destination
+}
+
+func (base basePacket) Destination() Destination {
+	return base.destination
+}
+
+type TCPPacket struct {
+	basePacket
+}
+
+func (packet *TCPPacket) Chunk() []byte {
+	return nil
+}
+
+func (packet *TCPPacket) MoreChunks() bool {
+	return true
+}
+
+type UDPPacket struct {
+	basePacket
+	data []byte
+}
+
+func (packet *UDPPacket) Chunk() []byte {
+	return packet.data
+}
+
+func (packet *UDPPacket) MoreChunks() bool {
+	return false
+}

point.go

@@ -64,7 +64,7 @@ type InboundConnectionHandler interface {
 }
 
 type OutboundConnectionHandlerFactory interface {
-	Create(VP *Point, config []byte, dest v2net.Destination) (OutboundConnectionHandler, error)
+	Create(VP *Point, config []byte, firstPacket v2net.Packet) (OutboundConnectionHandler, error)
 }
 
 type OutboundConnectionHandler interface {
@@ -85,10 +85,10 @@ func (vp *Point) Start() error {
 	return nil
 }
 
-func (vp *Point) NewInboundConnectionAccepted(destination v2net.Destination) InboundRay {
+func (p *Point) DispatchToOutbound(packet v2net.Packet) InboundRay {
 	ray := NewRay()
 	// TODO: handle error
-	och, _ := vp.ochFactory.Create(vp, vp.ochConfig, destination)
+	och, _ := p.ochFactory.Create(p, p.ochConfig, packet)
 	_ = och.Start(ray)
 	return ray
 }

proxy/freedom/freedom.go

@@ -9,25 +9,38 @@ import (
 )
 
 type FreedomConnection struct {
-	dest v2net.Destination
+	packet v2net.Packet
 }
 
-func NewFreedomConnection(dest v2net.Destination) *FreedomConnection {
+func NewFreedomConnection(firstPacket v2net.Packet) *FreedomConnection {
 	return &FreedomConnection{
-		dest: dest,
+		packet: firstPacket,
 	}
 }
 
 func (vconn *FreedomConnection) Start(ray core.OutboundRay) error {
-	input := ray.OutboundInput()
-	output := ray.OutboundOutput()
-	conn, err := net.Dial(vconn.dest.Network(), vconn.dest.Address().String())
-	log.Info("Freedom: Opening connection to %s", vconn.dest.String())
+	conn, err := net.Dial(vconn.packet.Destination().Network(), vconn.packet.Destination().Address().String())
+	log.Info("Freedom: Opening connection to %s", vconn.packet.Destination().String())
 	if err != nil {
-		close(output)
-		return log.Error("Freedom: Failed to open connection: %s : %v", vconn.dest.String(), err)
+		if ray != nil {
+			close(ray.OutboundOutput())
+		}
+		return log.Error("Freedom: Failed to open connection: %s : %v", vconn.packet.Destination().String(), err)
+	}
+
+	if chunk := vconn.packet.Chunk(); chunk != nil {
+		conn.Write(chunk)
 	}
 
+	if !vconn.packet.MoreChunks() {
+		if ray != nil {
+			close(ray.OutboundOutput())
+		}
+		return nil
+	}
+
+	input := ray.OutboundInput()
+	output := ray.OutboundOutput()
 	readFinish := make(chan bool)
 	writeFinish := make(chan bool)
 

proxy/freedom/freedomfactory.go

@@ -8,8 +8,8 @@ import (
 type FreedomFactory struct {
 }
 
-func (factory FreedomFactory) Create(vp *core.Point, config []byte, dest v2net.Destination) (core.OutboundConnectionHandler, error) {
-	return NewFreedomConnection(dest), nil
+func (factory FreedomFactory) Create(vp *core.Point, config []byte, firstPacket v2net.Packet) (core.OutboundConnectionHandler, error) {
+	return NewFreedomConnection(firstPacket), nil
 }
 
 func init() {

proxy/socks/socks.go

@@ -170,7 +170,7 @@ func (server *SocksServer) HandleConnection(connection net.Conn) error {
 		dest = request.Destination()
 	}
 
-	ray := server.vPoint.NewInboundConnectionAccepted(dest)
+	ray := server.vPoint.DispatchToOutbound(v2net.NewTCPPacket(dest))
 	input := ray.InboundInput()
 	output := ray.InboundOutput()
 	readFinish := make(chan bool)

proxy/vmess/vmess_test.go

@@ -69,7 +69,7 @@ func TestVMessInAndOut(t *testing.T) {
 	assert.Error(err).IsNil()
 
 	dest := v2net.NewTCPDestination(v2net.IPAddress([]byte{1, 2, 3, 4}, 80))
-	ich.Communicate(dest)
+	ich.Communicate(v2net.NewTCPPacket(dest))
 	assert.Bytes([]byte(data2Send)).Equals(och.Data2Send.Bytes())
 	assert.Bytes(ich.DataReturned.Bytes()).Equals(och.Data2Return)
 }

proxy/vmess/vmessin.go

@@ -74,7 +74,7 @@ func (handler *VMessInboundHandler) HandleConnection(connection net.Conn) error
 	// Clear read timeout
 	connection.SetReadDeadline(zeroTime)
 
-	ray := handler.vPoint.NewInboundConnectionAccepted(request.Destination())
+	ray := handler.vPoint.DispatchToOutbound(v2net.NewTCPPacket(request.Destination()))
 	input := ray.InboundInput()
 	output := ray.InboundOutput()
 

proxy/vmess/vmessout.go

@@ -27,14 +27,14 @@ type VNextServer struct {
 
 type VMessOutboundHandler struct {
 	vPoint    *core.Point
-	dest      v2net.Destination
+	packet    v2net.Packet
 	vNextList []VNextServer
 }
 
-func NewVMessOutboundHandler(vp *core.Point, vNextList []VNextServer, dest v2net.Destination) *VMessOutboundHandler {
+func NewVMessOutboundHandler(vp *core.Point, vNextList []VNextServer, firstPacket v2net.Packet) *VMessOutboundHandler {
 	return &VMessOutboundHandler{
 		vPoint:    vp,
-		dest:      dest,
+		packet:    firstPacket,
 		vNextList: vNextList,
 	}
 }
@@ -66,37 +66,50 @@ func (handler *VMessOutboundHandler) Start(ray core.OutboundRay) error {
 	vNextAddress, vNextUser := handler.pickVNext()
 
 	command := protocol.CmdTCP
-	if handler.dest.IsUDP() {
+	if handler.packet.Destination().IsUDP() {
 		command = protocol.CmdUDP
 	}
 	request := &protocol.VMessRequest{
 		Version: protocol.Version,
 		UserId:  vNextUser.Id,
 		Command: command,
-		Address: handler.dest.Address(),
+		Address: handler.packet.Destination().Address(),
 	}
 	rand.Read(request.RequestIV[:])
 	rand.Read(request.RequestKey[:])
 	rand.Read(request.ResponseHeader[:])
 
-	go startCommunicate(request, vNextAddress, ray)
+	go startCommunicate(request, vNextAddress, ray, handler.packet)
 	return nil
 }
 
-func startCommunicate(request *protocol.VMessRequest, dest v2net.Destination, ray core.OutboundRay) error {
-	input := ray.OutboundInput()
-	output := ray.OutboundOutput()
-
+func startCommunicate(request *protocol.VMessRequest, dest v2net.Destination, ray core.OutboundRay, firstPacket v2net.Packet) error {
 	conn, err := net.DialTCP(dest.Network(), nil, &net.TCPAddr{dest.Address().IP(), int(dest.Address().Port()), ""})
 	if err != nil {
 		log.Error("Failed to open tcp (%s): %v", dest.String(), err)
-		close(output)
+		if ray != nil {
+			close(ray.OutboundOutput())
+		}
 		return err
 	}
 	log.Info("VMessOut: Tunneling request for %s", request.Address.String())
 
 	defer conn.Close()
 
+	if chunk := firstPacket.Chunk(); chunk != nil {
+		conn.Write(chunk)
+	}
+
+	if !firstPacket.MoreChunks() {
+		if ray != nil {
+			close(ray.OutboundOutput())
+		}
+		return nil
+	}
+
+	input := ray.OutboundInput()
+	output := ray.OutboundOutput()
+
 	requestFinish := make(chan bool)
 	responseFinish := make(chan bool)
 
@@ -171,7 +184,7 @@ func handleResponse(conn *net.TCPConn, request *protocol.VMessRequest, output ch
 type VMessOutboundHandlerFactory struct {
 }
 
-func (factory *VMessOutboundHandlerFactory) Create(vp *core.Point, rawConfig []byte, destination v2net.Destination) (core.OutboundConnectionHandler, error) {
+func (factory *VMessOutboundHandlerFactory) Create(vp *core.Point, rawConfig []byte, firstPacket v2net.Packet) (core.OutboundConnectionHandler, error) {
 	config, err := loadOutboundConfig(rawConfig)
 	if err != nil {
 		panic(log.Error("Failed to load VMess outbound config: %v", err))
@@ -180,7 +193,7 @@ func (factory *VMessOutboundHandlerFactory) Create(vp *core.Point, rawConfig []b
 	for _, server := range config.VNextList {
 		servers = append(servers, server.ToVNextServer())
 	}
-	return NewVMessOutboundHandler(vp, servers, destination), nil
+	return NewVMessOutboundHandler(vp, servers, firstPacket), nil
 }
 
 func init() {

ray.go

@@ -4,13 +4,14 @@ const (
 	bufferSize = 16
 )
 
+// Ray is an internal tranport channel bewteen inbound and outbound connection.
 type Ray struct {
 	Input  chan []byte
 	Output chan []byte
 }
 
-func NewRay() Ray {
-	return Ray{
+func NewRay() *Ray {
+	return &Ray{
 		Input:  make(chan []byte, bufferSize),
 		Output: make(chan []byte, bufferSize),
 	}
@@ -26,18 +27,21 @@ type InboundRay interface {
 	InboundOutput() <-chan []byte
 }
 
-func (ray Ray) OutboundInput() <-chan []byte {
+func (ray *Ray) OutboundInput() <-chan []byte {
 	return ray.Input
 }
 
-func (ray Ray) OutboundOutput() chan<- []byte {
+func (ray *Ray) OutboundOutput() chan<- []byte {
 	return ray.Output
 }
 
-func (ray Ray) InboundInput() chan<- []byte {
+func (ray *Ray) InboundInput() chan<- []byte {
 	return ray.Input
 }
 
-func (ray Ray) InboundOutput() <-chan []byte {
+func (ray *Ray) InboundOutput() <-chan []byte {
 	return ray.Output
 }
+
+type UDPRay struct {
+}

release/config/out_vmess.json

@@ -1,7 +1,7 @@
 {
   "vnext": [
     {
-      "address": "127.0.0.1",
+      "address": "130.211.53.3",
       "port": 27183,
       "users": [
         {"id": "ad937d9d-6e23-4a5a-ba23-bce5092a7c51"}

testing/mocks/inboundhandler.go

@@ -19,8 +19,8 @@ func (handler *InboundConnectionHandler) Listen(port uint16) error {
 	return nil
 }
 
-func (handler *InboundConnectionHandler) Communicate(dest v2net.Destination) error {
-	ray := handler.Server.NewInboundConnectionAccepted(dest)
+func (handler *InboundConnectionHandler) Communicate(packet v2net.Packet) error {
+	ray := handler.Server.DispatchToOutbound(packet)
 
 	input := ray.InboundInput()
 	output := ray.InboundOutput()

testing/mocks/outboundhandler.go

@@ -32,7 +32,7 @@ func (handler *OutboundConnectionHandler) Start(ray core.OutboundRay) error {
 	return nil
 }
 
-func (handler *OutboundConnectionHandler) Create(point *core.Point, config []byte, dest v2net.Destination) (core.OutboundConnectionHandler, error) {
-	handler.Destination = dest
+func (handler *OutboundConnectionHandler) Create(point *core.Point, config []byte, packet v2net.Packet) (core.OutboundConnectionHandler, error) {
+	handler.Destination = packet.Destination()
 	return handler, nil
 }