func (server *SocksServer) handleSocks4(reader io.Reader, writer io.Writer, auth protocol.Socks4AuthenticationRequest) error {
result := protocol.Socks4RequestGranted
if auth.Command == protocol.CmdBind {
result = protocol.Socks4RequestRejected
}
socks4Response := protocol.NewSocks4AuthenticationResponse(result, auth.Port, auth.IP[:])
responseBuffer := alloc.NewSmallBuffer().Clear()
socks4Response.Write(responseBuffer)
writer.Write(responseBuffer.Value)
responseBuffer.Release()
if result == protocol.Socks4RequestRejected {
log.Warning("Unsupported socks 4 command %d", auth.Command)
return UnsupportedSocksCommand
}
dest := v2net.NewTCPDestination(v2net.IPAddress(auth.IP[:], auth.Port))
data, err := v2net.ReadFrom(reader, nil)
if err != nil {
return err
}
packet := v2net.NewPacket(dest, data, true)
server.transport(reader, writer, packet)
return nil
}
func (this *Server) handleConnection(conn internet.Connection) {
defer conn.Close()
timedReader := v2net.NewTimeOutReader(this.config.Timeout, conn)
reader := bufio.NewReaderSize(timedReader, 2048)
request, err := http.ReadRequest(reader)
if err != nil {
if err != io.EOF {
log.Warning("HTTP: Failed to read http request: ", err)
}
return
}
log.Info("HTTP: Request to Method [", request.Method, "] Host [", request.Host, "] with URL [", request.URL, "]")
defaultPort := v2net.Port(80)
if strings.ToLower(request.URL.Scheme) == "https" {
defaultPort = v2net.Port(443)
}
host := request.Host
if len(host) == 0 {
host = request.URL.Host
}
dest, err := parseHost(host, defaultPort)
if err != nil {
log.Warning("HTTP: Malformed proxy host (", host, "): ", err)
return
}
log.Access(conn.RemoteAddr(), request.URL, log.AccessAccepted, "")
if strings.ToUpper(request.Method) == "CONNECT" {
this.handleConnect(request, dest, reader, conn)
} else {
this.handlePlainHTTP(request, dest, reader, conn)
}
}
func (handler *VMessInboundHandler) AcceptPackets(conn *net.UDPConn) {
for {
buffer := make([]byte, bufferSize)
nBytes, addr, err := conn.ReadFromUDP(buffer)
if err != nil {
log.Error("VMessIn failed to read UDP packets: %v", err)
continue
}
reader := bytes.NewReader(buffer[:nBytes])
requestReader := protocol.NewVMessRequestReader(handler.clients)
request, err := requestReader.Read(reader)
if err != nil {
log.Warning("VMessIn: Invalid request from (%s): %v", addr.String(), err)
continue
}
cryptReader, err := v2io.NewAesDecryptReader(request.RequestKey, request.RequestIV, reader)
if err != nil {
log.Error("VMessIn: Failed to create decrypt reader: %v", err)
continue
}
data := make([]byte, bufferSize)
nBytes, err = cryptReader.Read(data)
if err != nil {
log.Warning("VMessIn: Unable to decrypt data: %v", err)
continue
}
packet := v2net.NewPacket(request.Destination(), data[:nBytes], false)
go handler.handlePacket(conn, request, packet, addr)
}
}
func (this *VMessOutboundHandler) handleCommand(dest v2net.Destination, cmdId byte, data []byte) {
if len(data) < 4 {
return
}
fnv1hash := fnv.New32a()
fnv1hash.Write(data[4:])
actualHashValue := fnv1hash.Sum32()
expectedHashValue := serial.BytesLiteral(data[:4]).Uint32Value()
if actualHashValue != expectedHashValue {
return
}
data = data[4:]
cmd, err := command.CreateResponseCommand(cmdId)
if err != nil {
log.Warning("VMessOut: Unknown response command (", cmdId, "): ", err)
return
}
if err := cmd.Unmarshal(data); err != nil {
log.Warning("VMessOut: Failed to parse response command: ", err)
return
}
switch typedCommand := cmd.(type) {
case *command.SwitchAccount:
if typedCommand.Host == nil {
typedCommand.Host = dest.Address()
}
this.handleSwitchAccount(typedCommand)
default:
}
}
func (this *HttpProxyServer) handleConnection(conn *hub.TCPConn) {
defer conn.Close()
reader := bufio.NewReader(conn)
request, err := http.ReadRequest(reader)
if err != nil {
log.Warning("Failed to read http request: ", err)
return
}
log.Info("Request to Method [", request.Method, "] Host [", request.Host, "] with URL [", request.URL, "]")
defaultPort := v2net.Port(80)
if strings.ToLower(request.URL.Scheme) == "https" {
defaultPort = v2net.Port(443)
}
host := request.Host
if len(host) == 0 {
host = request.URL.Host
}
dest, err := parseHost(host, defaultPort)
if err != nil {
log.Warning("Malformed proxy host (", host, "): ", err)
return
}
if strings.ToUpper(request.Method) == "CONNECT" {
this.handleConnect(request, dest, reader, conn)
} else {
this.handlePlainHTTP(request, dest, reader, conn)
}
}
func ReadVMessUDP(buffer []byte, userset user.UserSet) (*VMessUDP, error) {
userHash := buffer[:user.IDBytesLen]
userId, timeSec, valid := userset.GetUser(userHash)
if !valid {
return nil, errors.NewAuthenticationError(userHash)
}
buffer = buffer[user.IDBytesLen:]
aesCipher, err := aes.NewCipher(userId.CmdKey())
if err != nil {
return nil, err
}
aesStream := cipher.NewCFBDecrypter(aesCipher, user.Int64Hash(timeSec))
aesStream.XORKeyStream(buffer, buffer)
fnvHash := binary.BigEndian.Uint32(buffer[:4])
fnv1a := fnv.New32a()
fnv1a.Write(buffer[4:])
fnvHashActual := fnv1a.Sum32()
if fnvHash != fnvHashActual {
log.Warning("Unexpected fhv hash %d, should be %d", fnvHashActual, fnvHash)
return nil, errors.NewCorruptedPacketError()
}
buffer = buffer[4:]
vmess := &VMessUDP{
user: *userId,
version: buffer[0],
token: binary.BigEndian.Uint16(buffer[1:3]),
}
// buffer[3] is reserved
port := binary.BigEndian.Uint16(buffer[4:6])
addrType := buffer[6]
var address v2net.Address
switch addrType {
case addrTypeIPv4:
address = v2net.IPAddress(buffer[7:11], port)
buffer = buffer[11:]
case addrTypeIPv6:
address = v2net.IPAddress(buffer[7:23], port)
buffer = buffer[23:]
case addrTypeDomain:
domainLength := buffer[7]
domain := string(buffer[8 : 8+domainLength])
address = v2net.DomainAddress(domain, port)
buffer = buffer[8+domainLength:]
default:
log.Warning("Unexpected address type %d", addrType)
return nil, errors.NewCorruptedPacketError()
}
vmess.address = address
vmess.data = buffer
return vmess, nil
}
func handleResponse(conn net.Conn, request *protocol.VMessRequest, output chan<- []byte, finish *sync.Mutex, isUDP bool) {
defer finish.Unlock()
defer close(output)
responseKey := md5.Sum(request.RequestKey[:])
responseIV := md5.Sum(request.RequestIV[:])
decryptResponseReader, err := v2io.NewAesDecryptReader(responseKey[:], responseIV[:], conn)
if err != nil {
log.Error("VMessOut: Failed to create decrypt reader: %v", err)
return
}
buffer := make([]byte, 2*1024)
nBytes, err := decryptResponseReader.Read(buffer)
if err != nil {
//log.Error("VMessOut: Failed to read VMess response (%d bytes): %v", nBytes, err)
return
}
if !bytes.Equal(buffer[:4], request.ResponseHeader[:]) {
log.Warning("VMessOut: unexepcted response header. The connection is probably hijacked.")
return
}
output <- buffer[4:nBytes]
if !isUDP {
v2net.ReaderToChan(output, decryptResponseReader)
}
return
}
func ListenTCP(address v2net.Address, port v2net.Port, callback ConnectionHandler, settings *StreamSettings) (*TCPHub, error) {
var listener Listener
var err error
switch {
case settings.IsCapableOf(StreamConnectionTypeTCP):
listener, err = TCPListenFunc(address, port)
case settings.IsCapableOf(StreamConnectionTypeKCP):
listener, err = KCPListenFunc(address, port)
case settings.IsCapableOf(StreamConnectionTypeRawTCP):
listener, err = RawTCPListenFunc(address, port)
default:
log.Error("Internet|Listener: Unknown stream type: ", settings.Type)
err = ErrUnsupportedStreamType
}
if err != nil {
log.Warning("Internet|Listener: Failed to listen on ", address, ":", port)
return nil, err
}
var tlsConfig *tls.Config
if settings.Security == StreamSecurityTypeTLS {
tlsConfig = settings.TLSSettings.GetTLSConfig()
}
hub := &TCPHub{
listener: listener,
connCallback: callback,
tlsConfig: tlsConfig,
}
go hub.start()
return hub, nil
}
func handleResponse(conn *net.TCPConn, request *protocol.VMessRequest, output chan<- []byte, finish *sync.Mutex) {
defer finish.Unlock()
defer close(output)
responseKey := md5.Sum(request.RequestKey[:])
responseIV := md5.Sum(request.RequestIV[:])
decryptResponseReader, err := v2io.NewAesDecryptReader(responseKey[:], responseIV[:], conn)
if err != nil {
log.Error("VMessOut: Failed to create decrypt reader: %v", err)
return
}
response := protocol.VMessResponse{}
nBytes, err := decryptResponseReader.Read(response[:])
if err != nil {
log.Error("VMessOut: Failed to read VMess response (%d bytes): %v", nBytes, err)
log.Error(InfoTimeNotSync)
return
}
if !bytes.Equal(response[:], request.ResponseHeader[:]) {
log.Warning("VMessOut: unexepcted response header. The connection is probably hijacked.")
return
}
v2net.ReaderToChan(output, decryptResponseReader)
return
}
func (this *Server) handleConnection(connection internet.Connection) {
defer connection.Close()
timedReader := v2net.NewTimeOutReader(this.config.Timeout, connection)
reader := v2io.NewBufferedReader(timedReader)
defer reader.Release()
writer := v2io.NewBufferedWriter(connection)
defer writer.Release()
auth, auth4, err := protocol.ReadAuthentication(reader)
if err != nil && err != protocol.Socks4Downgrade {
if err != io.EOF {
log.Warning("Socks: failed to read authentication: ", err)
}
return
}
clientAddr := connection.RemoteAddr().String()
if err != nil && err == protocol.Socks4Downgrade {
this.handleSocks4(clientAddr, reader, writer, auth4)
} else {
this.handleSocks5(clientAddr, reader, writer, auth)
}
}
func (this *ClientSession) DecodeResponseHeader(reader io.Reader) (*protocol.ResponseHeader, error) {
aesStream := crypto.NewAesDecryptionStream(this.responseBodyKey, this.responseBodyIV)
this.responseReader = crypto.NewCryptionReader(aesStream, reader)
buffer := alloc.NewSmallBuffer()
defer buffer.Release()
_, err := io.ReadFull(this.responseReader, buffer.Value[:4])
if err != nil {
log.Error("Raw: Failed to read response header: ", err)
return nil, err
}
if buffer.Value[0] != this.responseHeader {
log.Warning("Raw: Unexpected response header. Expecting %d, but actually %d", this.responseHeader, buffer.Value[0])
return nil, transport.ErrorCorruptedPacket
}
header := new(protocol.ResponseHeader)
if buffer.Value[2] != 0 {
cmdId := buffer.Value[2]
dataLen := int(buffer.Value[3])
_, err := io.ReadFull(this.responseReader, buffer.Value[:dataLen])
if err != nil {
log.Error("Raw: Failed to read response command: ", err)
return nil, err
}
data := buffer.Value[:dataLen]
command, err := UnmarshalCommand(cmdId, data)
header.Command = command
}
return header, nil
}
func (this *VMessOutboundHandler) handleResponse(session *raw.ClientSession, conn net.Conn, request *proto.RequestHeader, dest v2net.Destination, output chan<- *alloc.Buffer, finish *sync.Mutex) {
defer finish.Unlock()
defer close(output)
reader := v2io.NewBufferedReader(conn)
header, err := session.DecodeResponseHeader(reader)
if err != nil {
log.Warning("VMessOut: Failed to read response: ", err)
return
}
go this.handleCommand(dest, header.Command)
reader.SetCached(false)
decryptReader := session.DecodeResponseBody(conn)
var bodyReader v2io.Reader
if request.Option.IsChunkStream() {
bodyReader = vmessio.NewAuthChunkReader(decryptReader)
} else {
bodyReader = v2io.NewAdaptiveReader(decryptReader)
}
v2io.ReaderToChan(output, bodyReader)
return
}
// Start starts the Point server, and return any error during the process.
// In the case of any errors, the state of the server is unpredicatable.
func (this *Point) Start() error {
if this.port <= 0 {
log.Error("Invalid port ", this.port)
return BadConfiguration
}
err := retry.Timed(100 /* times */, 100 /* ms */).On(func() error {
err := this.ich.Listen(this.port)
if err != nil {
return err
}
log.Warning("Point server started on port ", this.port)
return nil
})
if err != nil {
return err
}
for _, detourHandler := range this.idh {
err := detourHandler.Start()
if err != nil {
return err
}
}
return nil
}
func ReadUDPRequest(packet []byte) (request Socks5UDPRequest, err error) {
// packet[0] and packet[1] are reserved
request.Fragment = packet[2]
addrType := packet[3]
var dataBegin int
switch addrType {
case AddrTypeIPv4:
ip := packet[4:8]
port := binary.BigEndian.Uint16(packet[8:10])
request.Address = v2net.IPAddress(ip, port)
dataBegin = 10
case AddrTypeIPv6:
ip := packet[4:20]
port := binary.BigEndian.Uint16(packet[20:22])
request.Address = v2net.IPAddress(ip, port)
dataBegin = 22
case AddrTypeDomain:
domainLength := int(packet[4])
domain := string(packet[5 : 5+domainLength])
port := binary.BigEndian.Uint16(packet[5+domainLength : 5+domainLength+2])
request.Address = v2net.DomainAddress(domain, port)
dataBegin = 5 + domainLength + 2
default:
log.Warning("Unknown address type %d", addrType)
err = ErrorUnknownAddressType
return
}
request.Data = make([]byte, len(packet)-dataBegin)
copy(request.Data, packet[dataBegin:])
return
}
func handleResponse(conn net.Conn, request *protocol.VMessRequest, output chan<- *alloc.Buffer, finish *sync.Mutex, isUDP bool) {
defer finish.Unlock()
defer close(output)
responseKey := md5.Sum(request.RequestKey[:])
responseIV := md5.Sum(request.RequestIV[:])
decryptResponseReader, err := v2io.NewAesDecryptReader(responseKey[:], responseIV[:], conn)
if err != nil {
log.Error("VMessOut: Failed to create decrypt reader: %v", err)
return
}
buffer, err := v2net.ReadFrom(decryptResponseReader, nil)
if err != nil {
log.Error("VMessOut: Failed to read VMess response (%d bytes): %v", buffer.Len(), err)
return
}
if buffer.Len() < 4 || !bytes.Equal(buffer.Value[:4], request.ResponseHeader[:]) {
log.Warning("VMessOut: unexepcted response header. The connection is probably hijacked.")
return
}
log.Info("VMessOut received %d bytes from %s", buffer.Len()-4, conn.RemoteAddr().String())
buffer.SliceFrom(4)
output <- buffer
if !isUDP {
v2net.ReaderToChan(output, decryptResponseReader)
}
return
}
func (server *SocksServer) AcceptPackets(conn *net.UDPConn) error {
for {
buffer := alloc.NewBuffer()
nBytes, addr, err := conn.ReadFromUDP(buffer.Value)
if err != nil {
log.Error("Socks failed to read UDP packets: %v", err)
buffer.Release()
continue
}
log.Info("Client UDP connection from %v", addr)
request, err := protocol.ReadUDPRequest(buffer.Value[:nBytes])
buffer.Release()
if err != nil {
log.Error("Socks failed to parse UDP request: %v", err)
request.Data.Release()
continue
}
if request.Fragment != 0 {
log.Warning("Dropping fragmented UDP packets.")
// TODO handle fragments
request.Data.Release()
continue
}
udpPacket := v2net.NewPacket(request.Destination(), request.Data, false)
log.Info("Send packet to %s with %d bytes", udpPacket.Destination().String(), request.Data.Len())
go server.handlePacket(conn, udpPacket, addr, request.Address)
}
}
func (this *VMessOutboundHandler) handleCommand(cmdId byte, data []byte) {
cmd, err := command.CreateResponseCommand(cmdId)
if err != nil {
log.Warning("VMessOut: Unknown response command (", cmdId, "): ", err)
return
}
if err := cmd.Unmarshal(data); err != nil {
log.Warning("VMessOut: Failed to parse response command: ", err)
return
}
switch typedCommand := cmd.(type) {
case *command.SwitchAccount:
this.handleSwitchAccount(typedCommand)
default:
}
}
func (this *Server) handlePlainHTTP(request *http.Request, dest v2net.Destination, reader *bufio.Reader, writer io.Writer) {
if len(request.URL.Host) <= 0 {
response := this.GenerateResponse(400, "Bad Request")
response.Write(writer)
return
}
request.Host = request.URL.Host
StripHopByHopHeaders(request)
ray := this.packetDispatcher.DispatchToOutbound(dest)
defer ray.InboundInput().Close()
defer ray.InboundOutput().Release()
var finish sync.WaitGroup
finish.Add(1)
go func() {
defer finish.Done()
requestWriter := v2io.NewBufferedWriter(v2io.NewChainWriter(ray.InboundInput()))
err := request.Write(requestWriter)
if err != nil {
log.Warning("HTTP: Failed to write request: ", err)
return
}
requestWriter.Flush()
}()
finish.Add(1)
go func() {
defer finish.Done()
responseReader := bufio.NewReader(v2io.NewChanReader(ray.InboundOutput()))
response, err := http.ReadResponse(responseReader, request)
if err != nil {
log.Warning("HTTP: Failed to read response: ", err)
response = this.GenerateResponse(503, "Service Unavailable")
}
responseWriter := v2io.NewBufferedWriter(writer)
err = response.Write(responseWriter)
if err != nil {
log.Warning("HTTP: Failed to write response: ", err)
return
}
responseWriter.Flush()
}()
finish.Wait()
}
func (this *Point) GetHandler(context app.Context, tag string) (proxy.InboundHandler, int) {
handler, found := this.taggedIdh[tag]
if !found {
log.Warning("Point: Unable to find an inbound handler with tag: ", tag)
return nil, 0
}
return handler.GetConnectionHandler()
}
func (this *VMessInboundHandler) HandleConnection(connection *net.TCPConn) error {
defer connection.Close()
connReader := v2net.NewTimeOutReader(16, connection)
requestReader := protocol.NewVMessRequestReader(this.clients)
request, err := requestReader.Read(connReader)
if err != nil {
log.Access(connection.RemoteAddr().String(), "", log.AccessRejected, err.Error())
log.Warning("VMessIn: Invalid request from (%s): %v", connection.RemoteAddr().String(), err)
return err
}
log.Access(connection.RemoteAddr().String(), request.Address.String(), log.AccessAccepted, "")
log.Debug("VMessIn: Received request for %s", request.Address.String())
ray := this.space.PacketDispatcher().DispatchToOutbound(v2net.NewPacket(request.Destination(), nil, true))
input := ray.InboundInput()
output := ray.InboundOutput()
var readFinish, writeFinish sync.Mutex
readFinish.Lock()
writeFinish.Lock()
userSettings := vmess.GetUserSettings(request.User.Level)
connReader.SetTimeOut(userSettings.PayloadReadTimeout)
go handleInput(request, connReader, input, &readFinish)
responseKey := md5.Sum(request.RequestKey)
responseIV := md5.Sum(request.RequestIV)
aesStream, err := v2crypto.NewAesEncryptionStream(responseKey[:], responseIV[:])
if err != nil {
log.Error("VMessIn: Failed to create AES decryption stream: %v", err)
close(input)
return err
}
responseWriter := v2crypto.NewCryptionWriter(aesStream, connection)
// Optimize for small response packet
buffer := alloc.NewLargeBuffer().Clear()
defer buffer.Release()
buffer.AppendBytes(request.ResponseHeader[0] ^ request.ResponseHeader[1])
buffer.AppendBytes(request.ResponseHeader[2] ^ request.ResponseHeader[3])
buffer.AppendBytes(byte(0), byte(0))
if data, open := <-output; open {
buffer.Append(data.Value)
data.Release()
responseWriter.Write(buffer.Value)
go handleOutput(request, responseWriter, output, &writeFinish)
writeFinish.Lock()
}
connection.CloseWrite()
readFinish.Lock()
return nil
}
func ReadAuthentication(reader io.Reader) (auth Socks5AuthenticationRequest, auth4 Socks4AuthenticationRequest, err error) {
buffer := alloc.NewSmallBuffer()
defer buffer.Release()
nBytes, err := reader.Read(buffer.Value)
if err != nil {
return
}
if nBytes < 2 {
log.Warning("Socks: expected 2 bytes read, but only ", nBytes, " bytes read")
err = transport.ErrCorruptedPacket
return
}
if buffer.Value[0] == socks4Version {
auth4.Version = buffer.Value[0]
auth4.Command = buffer.Value[1]
auth4.Port = v2net.PortFromBytes(buffer.Value[2:4])
copy(auth4.IP[:], buffer.Value[4:8])
err = Socks4Downgrade
return
}
auth.version = buffer.Value[0]
if auth.version != socksVersion {
log.Warning("Socks: Unknown protocol version ", auth.version)
err = proxy.ErrInvalidProtocolVersion
return
}
auth.nMethods = buffer.Value[1]
if auth.nMethods <= 0 {
log.Warning("Socks: Zero length of authentication methods")
err = proxy.ErrInvalidAuthentication
return
}
if nBytes-2 != int(auth.nMethods) {
log.Warning("Socks: Unmatching number of auth methods, expecting ", auth.nMethods, ", but got ", nBytes)
err = proxy.ErrInvalidAuthentication
return
}
copy(auth.authMethods[:], buffer.Value[2:nBytes])
return
}
func (handler *VMessInboundHandler) AcceptPackets(conn *net.UDPConn) {
for {
buffer := alloc.NewBuffer()
nBytes, addr, err := conn.ReadFromUDP(buffer.Value)
if err != nil {
log.Error("VMessIn failed to read UDP packets: %v", err)
buffer.Release()
continue
}
reader := bytes.NewReader(buffer.Value[:nBytes])
requestReader := protocol.NewVMessRequestReader(handler.clients)
request, err := requestReader.Read(reader)
if err != nil {
log.Access(addr.String(), "", log.AccessRejected, err.Error())
log.Warning("VMessIn: Invalid request from (%s): %v", addr.String(), err)
buffer.Release()
continue
}
log.Access(addr.String(), request.Address.String(), log.AccessAccepted, "")
cryptReader, err := v2io.NewAesDecryptReader(request.RequestKey, request.RequestIV, reader)
if err != nil {
log.Error("VMessIn: Failed to create decrypt reader: %v", err)
buffer.Release()
continue
}
data := alloc.NewBuffer()
nBytes, err = cryptReader.Read(data.Value)
buffer.Release()
if err != nil {
log.Warning("VMessIn: Unable to decrypt data: %v", err)
data.Release()
continue
}
data.Slice(0, nBytes)
packet := v2net.NewPacket(request.Destination(), data, false)
go handler.handlePacket(conn, request, packet, addr)
}
}
func ReadUDPRequest(packet []byte) (*Socks5UDPRequest, error) {
if len(packet) < 5 {
return nil, transport.CorruptedPacket
}
request := new(Socks5UDPRequest)
// packet[0] and packet[1] are reserved
request.Fragment = packet[2]
addrType := packet[3]
var dataBegin int
switch addrType {
case AddrTypeIPv4:
if len(packet) < 10 {
return nil, transport.CorruptedPacket
}
ip := packet[4:8]
request.Port = v2net.PortFromBytes(packet[8:10])
request.Address = v2net.IPAddress(ip)
dataBegin = 10
case AddrTypeIPv6:
if len(packet) < 22 {
return nil, transport.CorruptedPacket
}
ip := packet[4:20]
request.Port = v2net.PortFromBytes(packet[20:22])
request.Address = v2net.IPAddress(ip)
dataBegin = 22
case AddrTypeDomain:
domainLength := int(packet[4])
if len(packet) < 5+domainLength+2 {
return nil, transport.CorruptedPacket
}
domain := string(packet[5 : 5+domainLength])
request.Port = v2net.PortFromBytes(packet[5+domainLength : 5+domainLength+2])
maybeIP := net.ParseIP(domain)
if maybeIP != nil {
request.Address = v2net.IPAddress(maybeIP)
} else {
request.Address = v2net.DomainAddress(domain)
}
dataBegin = 5 + domainLength + 2
default:
log.Warning("Unknown address type ", addrType)
return nil, ErrorUnknownAddressType
}
if len(packet) > dataBegin {
request.Data = alloc.NewBuffer().Clear().Append(packet[dataBegin:])
}
return request, nil
}
func (dest *Destination) Network() string {
switch dest.network {
case NetTCP:
return "tcp"
case NetUDP:
return "udp"
default:
log.Warning("Unknown network %d", dest.network)
return "tcp"
}
}
func (this *VMessOutboundHandler) handleRequest(conn net.Conn, request *protocol.VMessRequest, firstPacket v2net.Packet, input <-chan *alloc.Buffer, finish *sync.Mutex) {
defer finish.Unlock()
aesStream, err := v2crypto.NewAesEncryptionStream(request.RequestKey[:], request.RequestIV[:])
if err != nil {
log.Error("VMessOut: Failed to create AES encryption stream: ", err)
return
}
encryptRequestWriter := v2crypto.NewCryptionWriter(aesStream, conn)
buffer := alloc.NewBuffer().Clear()
defer buffer.Release()
buffer, err = request.ToBytes(protocol.NewRandomTimestampGenerator(protocol.Timestamp(time.Now().Unix()), 30), buffer)
if err != nil {
log.Error("VMessOut: Failed to serialize VMess request: ", err)
return
}
// Send first packet of payload together with request, in favor of small requests.
firstChunk := firstPacket.Chunk()
moreChunks := firstPacket.MoreChunks()
for firstChunk == nil && moreChunks {
firstChunk, moreChunks = <-input
}
if firstChunk == nil && !moreChunks {
log.Warning("VMessOut: Nothing to send. Existing...")
return
}
if request.IsChunkStream() {
vmessio.Authenticate(firstChunk)
}
aesStream.XORKeyStream(firstChunk.Value, firstChunk.Value)
buffer.Append(firstChunk.Value)
firstChunk.Release()
_, err = conn.Write(buffer.Value)
if err != nil {
log.Error("VMessOut: Failed to write VMess request: ", err)
return
}
if moreChunks {
var streamWriter v2io.Writer
streamWriter = v2io.NewAdaptiveWriter(encryptRequestWriter)
if request.IsChunkStream() {
streamWriter = vmessio.NewAuthChunkWriter(streamWriter)
}
v2io.ChanToWriter(streamWriter, input)
}
return
}
func (handler *VMessInboundHandler) HandleConnection(connection *net.TCPConn) error {
defer connection.Close()
connReader := v2net.NewTimeOutReader(16, connection)
requestReader := protocol.NewVMessRequestReader(handler.clients)
request, err := requestReader.Read(connReader)
if err != nil {
log.Access(connection.RemoteAddr().String(), "", log.AccessRejected, err.Error())
log.Warning("VMessIn: Invalid request from (%s): %v", connection.RemoteAddr().String(), err)
return err
}
log.Access(connection.RemoteAddr().String(), request.Address.String(), log.AccessAccepted, "")
log.Debug("VMessIn: Received request for %s", request.Address.String())
ray := handler.dispatcher.DispatchToOutbound(v2net.NewPacket(request.Destination(), nil, true))
input := ray.InboundInput()
output := ray.InboundOutput()
var readFinish, writeFinish sync.Mutex
readFinish.Lock()
writeFinish.Lock()
connReader.SetTimeOut(120)
go handleInput(request, connReader, input, &readFinish)
responseKey := md5.Sum(request.RequestKey)
responseIV := md5.Sum(request.RequestIV)
responseWriter, err := v2io.NewAesEncryptWriter(responseKey[:], responseIV[:], connection)
if err != nil {
log.Error("VMessIn: Failed to create encrypt writer: %v", err)
return err
}
// Optimize for small response packet
buffer := alloc.NewLargeBuffer().Clear()
buffer.Append(request.ResponseHeader)
if data, open := <-output; open {
buffer.Append(data.Value)
data.Release()
responseWriter.Write(buffer.Value)
buffer.Release()
go handleOutput(request, responseWriter, output, &writeFinish)
writeFinish.Lock()
}
connection.CloseWrite()
readFinish.Lock()
return nil
}
func ReadRequest(reader io.Reader) (request *Socks5Request, err error) {
buffer := alloc.NewSmallBuffer()
defer buffer.Release()
_, err = io.ReadFull(reader, buffer.Value[:4])
if err != nil {
return
}
request = &Socks5Request{
Version: buffer.Value[0],
Command: buffer.Value[1],
// buffer[2] is a reserved field
AddrType: buffer.Value[3],
}
switch request.AddrType {
case AddrTypeIPv4:
_, err = io.ReadFull(reader, request.IPv4[:])
if err != nil {
return
}
case AddrTypeDomain:
_, err = io.ReadFull(reader, buffer.Value[0:1])
if err != nil {
return
}
domainLength := buffer.Value[0]
_, err = io.ReadFull(reader, buffer.Value[:domainLength])
if err != nil {
return
}
request.Domain = string(append([]byte(nil), buffer.Value[:domainLength]...))
case AddrTypeIPv6:
_, err = io.ReadFull(reader, request.IPv6[:])
if err != nil {
return
}
default:
log.Warning("Socks: Unexpected address type ", request.AddrType)
err = transport.ErrCorruptedPacket
return
}
_, err = io.ReadFull(reader, buffer.Value[:2])
if err != nil {
return
}
request.Port = v2net.PortFromBytes(buffer.Value[:2])
return
}
func (handler *VMessInboundHandler) HandleConnection(connection net.Conn) error {
defer connection.Close()
reader := protocol.NewVMessRequestReader(handler.clients)
// Timeout 4 seconds to prevent DoS attack
connection.SetReadDeadline(time.Now().Add(requestReadTimeOut))
request, err := reader.Read(connection)
if err != nil {
log.Warning("VMessIn: Invalid request from (%s): %v", connection.RemoteAddr().String(), err)
return err
}
log.Debug("VMessIn: Received request for %s", request.Address.String())
// Clear read timeout
connection.SetReadDeadline(zeroTime)
ray := handler.vPoint.NewInboundConnectionAccepted(request.Destination())
input := ray.InboundInput()
output := ray.InboundOutput()
readFinish := make(chan bool)
writeFinish := make(chan bool)
go handleInput(request, connection, input, readFinish)
responseKey := md5.Sum(request.RequestKey[:])
responseIV := md5.Sum(request.RequestIV[:])
response := protocol.NewVMessResponse(request)
responseWriter, err := v2io.NewAesEncryptWriter(responseKey[:], responseIV[:], connection)
if err != nil {
return log.Error("VMessIn: Failed to create encrypt writer: %v", err)
}
// Optimize for small response packet
buffer := make([]byte, 0, 1024)
buffer = append(buffer, response[:]...)
if data, open := <-output; open {
buffer = append(buffer, data...)
responseWriter.Write(buffer)
go handleOutput(request, responseWriter, output, writeFinish)
<-writeFinish
}
if tcpConn, ok := connection.(*net.TCPConn); ok {
tcpConn.CloseWrite()
}
<-readFinish
return nil
}
func (this *TCPListener) start() {
this.accepting = true
for this.accepting {
conn, err := this.listener.AcceptTCP()
if err != nil {
log.Warning("Listener: Failed to accept new TCP connection: ", err)
continue
}
go this.connCallback(&TCPConn{
conn: conn,
listener: this,
})
}
}
func (this *VMessOutboundHandler) handleResponse(conn net.Conn, request *protocol.VMessRequest, dest v2net.Destination, output chan<- *alloc.Buffer, finish *sync.Mutex) {
defer finish.Unlock()
defer close(output)
responseKey := md5.Sum(request.RequestKey[:])
responseIV := md5.Sum(request.RequestIV[:])
aesStream, err := v2crypto.NewAesDecryptionStream(responseKey[:], responseIV[:])
if err != nil {
log.Error("VMessOut: Failed to create AES encryption stream: ", err)
return
}
decryptResponseReader := v2crypto.NewCryptionReader(aesStream, conn)
buffer := alloc.NewSmallBuffer()
defer buffer.Release()
_, err = io.ReadFull(decryptResponseReader, buffer.Value[:4])
if err != nil {
log.Error("VMessOut: Failed to read VMess response (", buffer.Len(), " bytes): ", err)
return
}
if !headerMatch(request, buffer.Value[0]) {
log.Warning("VMessOut: unexepcted response header. The connection is probably hijacked.")
return
}
if buffer.Value[2] != 0 {
command := buffer.Value[2]
dataLen := int(buffer.Value[3])
_, err := io.ReadFull(decryptResponseReader, buffer.Value[:dataLen])
if err != nil {
log.Error("VMessOut: Failed to read response command: ", err)
return
}
data := buffer.Value[:dataLen]
go this.handleCommand(dest, command, data)
}
var reader v2io.Reader
if request.IsChunkStream() {
reader = vmessio.NewAuthChunkReader(decryptResponseReader)
} else {
reader = v2io.NewAdaptiveReader(decryptResponseReader)
}
v2io.ReaderToChan(output, reader)
return
}
