func (v *VMessOutboundHandler) handleResponse(session *encoding.ClientSession, conn internet.Connection, request *protocol.RequestHeader, dest v2net.Destination, output buf.Writer, finish *sync.Mutex) {
defer finish.Unlock()
reader := bufio.NewReader(conn)
defer reader.Release()
header, err := session.DecodeResponseHeader(reader)
if err != nil {
conn.SetReusable(false)
log.Warning("VMess|Outbound: Failed to read response from ", request.Destination(), ": ", err)
return
}
v.handleCommand(dest, header.Command)
conn.SetReusable(header.Option.Has(protocol.ResponseOptionConnectionReuse))
reader.SetCached(false)
bodyReader := session.DecodeResponseBody(request, reader)
defer bodyReader.Release()
if err := buf.PipeUntilEOF(bodyReader, output); err != nil {
conn.SetReusable(false)
}
return
}
func (this *VMessOutboundHandler) handleResponse(session *encoding.ClientSession, conn internet.Connection, request *protocol.RequestHeader, dest v2net.Destination, output v2io.Writer, finish *sync.Mutex) {
defer finish.Unlock()
reader := v2io.NewBufferedReader(conn)
defer reader.Release()
header, err := session.DecodeResponseHeader(reader)
if err != nil {
conn.SetReusable(false)
log.Warning("VMess|Outbound: Failed to read response from ", request.Destination(), ": ", err)
return
}
go this.handleCommand(dest, header.Command)
if !header.Option.Has(protocol.ResponseOptionConnectionReuse) {
conn.SetReusable(false)
}
reader.SetCached(false)
decryptReader := session.DecodeResponseBody(reader)
var bodyReader v2io.Reader
if request.Option.Has(protocol.RequestOptionChunkStream) {
bodyReader = vmessio.NewAuthChunkReader(decryptReader)
} else {
bodyReader = v2io.NewAdaptiveReader(decryptReader)
}
err = v2io.Pipe(bodyReader, output)
if err != io.EOF {
conn.SetReusable(false)
}
bodyReader.Release()
return
}
func (s *ServerSession) Handshake(reader io.Reader, writer io.Writer) (*protocol.RequestHeader, error) {
buffer := buf.NewLocal(512)
request := new(protocol.RequestHeader)
if err := buffer.AppendSupplier(buf.ReadFullFrom(reader, 2)); err != nil {
return nil, errors.Base(err).Message("Socks|Server: Insufficient header.")
}
version := buffer.Byte(0)
if version == socks4Version {
if err := buffer.AppendSupplier(buf.ReadFullFrom(reader, 6)); err != nil {
return nil, errors.Base(err).Message("Socks|Server: Insufficient header.")
}
port := v2net.PortFromBytes(buffer.BytesRange(2, 4))
address := v2net.IPAddress(buffer.BytesRange(4, 8))
_, err := readUntilNull(reader) // user id
if err != nil {
return nil, err
}
if address.IP()[0] == 0x00 {
domain, err := readUntilNull(reader)
if err != nil {
return nil, errors.Base(err).Message("Socks|Server: Failed to read domain for socks 4a.")
}
address = v2net.DomainAddress(domain)
}
switch buffer.Byte(1) {
case cmdTCPConnect:
request.Command = protocol.RequestCommandTCP
request.Address = address
request.Port = port
request.Version = socks4Version
if err := writeSocks4Response(writer, socks4RequestGranted, v2net.AnyIP, v2net.Port(0)); err != nil {
return nil, err
}
return request, nil
default:
writeSocks4Response(writer, socks4RequestRejected, v2net.AnyIP, v2net.Port(0))
return nil, errors.New("Socks|Server: Unsupported command: ", buffer.Byte(1))
}
}
if version == socks5Version {
nMethod := int(buffer.Byte(1))
if err := buffer.AppendSupplier(buf.ReadFullFrom(reader, nMethod)); err != nil {
return nil, err
}
var expectedAuth byte = authNotRequired
if s.config.AuthType == AuthType_PASSWORD {
expectedAuth = authPassword
}
if !hasAuthMethod(expectedAuth, buffer.BytesRange(2, 2+nMethod)) {
writeSocks5AuthenticationResponse(writer, authNoMatchingMethod)
return nil, errors.New("Socks|Server: No matching auth method.")
}
if err := writeSocks5AuthenticationResponse(writer, expectedAuth); err != nil {
return nil, err
}
if expectedAuth == authPassword {
username, password, err := readUsernamePassword(reader)
if err != nil {
return nil, errors.Base(err).Message("Socks|Server: Failed to read username and password for authentication.")
}
if !s.config.HasAccount(username, password) {
writeSocks5AuthenticationResponse(writer, 0xFF)
return nil, errors.New("Socks|Server: Invalid username or password.")
}
if err := writeSocks5AuthenticationResponse(writer, 0x00); err != nil {
return nil, err
}
}
buffer.Clear()
if err := buffer.AppendSupplier(buf.ReadFullFrom(reader, 4)); err != nil {
return nil, err
}
cmd := buffer.Byte(1)
if cmd == cmdTCPBind || (cmd == cmdUDPPort && !s.config.UdpEnabled) {
writeSocks5Response(writer, statusCmdNotSupport, v2net.AnyIP, v2net.Port(0))
return nil, errors.New("Socks|Server: Unsupported command: ", cmd)
}
switch cmd {
case cmdTCPConnect:
request.Command = protocol.RequestCommandTCP
case cmdUDPPort:
request.Command = protocol.RequestCommandUDP
}
addrType := buffer.Byte(3)
buffer.Clear()
request.Version = socks5Version
switch addrType {
case addrTypeIPv4:
if err := buffer.AppendSupplier(buf.ReadFullFrom(reader, 4)); err != nil {
return nil, err
}
request.Address = v2net.IPAddress(buffer.Bytes())
case addrTypeIPv6:
if err := buffer.AppendSupplier(buf.ReadFullFrom(reader, 16)); err != nil {
return nil, err
}
request.Address = v2net.IPAddress(buffer.Bytes())
case addrTypeDomain:
if err := buffer.AppendSupplier(buf.ReadFullFrom(reader, 1)); err != nil {
return nil, err
}
domainLength := int(buffer.Byte(0))
if err := buffer.AppendSupplier(buf.ReadFullFrom(reader, domainLength)); err != nil {
return nil, err
}
request.Address = v2net.DomainAddress(string(buffer.BytesFrom(-domainLength)))
default:
return nil, errors.New("Socks|Server: Unknown address type: ", addrType)
}
if err := buffer.AppendSupplier(buf.ReadFullFrom(reader, 2)); err != nil {
return nil, err
}
request.Port = v2net.PortFromBytes(buffer.BytesFrom(-2))
responseAddress := v2net.AnyIP
responsePort := v2net.Port(1717)
if request.Command == protocol.RequestCommandUDP {
addr := s.config.Address.AsAddress()
if addr == nil {
addr = v2net.LocalHostIP
}
responseAddress = addr
responsePort = s.port
}
if err := writeSocks5Response(writer, statusSuccess, responseAddress, responsePort); err != nil {
return nil, err
}
return request, nil
}
return nil, errors.New("Socks|Server: Unknown Socks version: ", version)
}