2015-09-08 07:18:55 -04:00
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package socks
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2015-09-07 08:49:40 -04:00
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import (
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"errors"
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2015-09-15 18:06:22 -04:00
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"io"
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2015-09-23 08:14:53 -04:00
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"sync"
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2015-10-06 11:24:57 -04:00
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"time"
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2015-09-09 06:13:52 -04:00
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2016-08-20 14:55:45 -04:00
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"v2ray.com/core/app"
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"v2ray.com/core/app/dispatcher"
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v2io "v2ray.com/core/common/io"
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2016-10-16 08:22:21 -04:00
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"v2ray.com/core/common/loader"
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"v2ray.com/core/common/log"
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v2net "v2ray.com/core/common/net"
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"v2ray.com/core/proxy"
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"v2ray.com/core/proxy/registry"
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"v2ray.com/core/proxy/socks/protocol"
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"v2ray.com/core/transport/internet"
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"v2ray.com/core/transport/internet/udp"
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2015-09-09 06:13:52 -04:00
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)
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2015-10-13 07:55:06 -04:00
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var (
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ErrUnsupportedSocksCommand = errors.New("Unsupported socks command.")
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ErrUnsupportedAuthMethod = errors.New("Unsupported auth method.")
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)
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2016-04-25 18:33:16 -04:00
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// Server is a SOCKS 5 proxy server
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type Server struct {
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tcpMutex sync.RWMutex
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udpMutex sync.RWMutex
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accepting bool
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packetDispatcher dispatcher.PacketDispatcher
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config *ServerConfig
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tcpListener *internet.TCPHub
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udpHub *udp.UDPHub
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udpAddress v2net.Destination
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udpServer *udp.UDPServer
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meta *proxy.InboundHandlerMeta
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}
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// NewServer creates a new Server object.
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func NewServer(config *ServerConfig, space app.Space, meta *proxy.InboundHandlerMeta) *Server {
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s := &Server{
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config: config,
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meta: meta,
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}
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space.InitializeApplication(func() error {
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if !space.HasApp(dispatcher.APP_ID) {
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log.Error("Socks|Server: Dispatcher is not found in the space.")
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return app.ErrMissingApplication
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}
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s.packetDispatcher = space.GetApp(dispatcher.APP_ID).(dispatcher.PacketDispatcher)
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return nil
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})
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return s
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2015-09-07 08:49:40 -04:00
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}
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2016-02-06 12:01:27 -05:00
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// Port implements InboundHandler.Port().
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func (this *Server) Port() v2net.Port {
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return this.meta.Port
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}
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// Close implements InboundHandler.Close().
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func (this *Server) Close() {
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this.accepting = false
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if this.tcpListener != nil {
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this.tcpMutex.Lock()
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this.tcpListener.Close()
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this.tcpListener = nil
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this.tcpMutex.Unlock()
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}
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if this.udpHub != nil {
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this.udpMutex.Lock()
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this.udpHub.Close()
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this.udpHub = nil
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this.udpMutex.Unlock()
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}
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}
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// Listen implements InboundHandler.Listen().
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func (this *Server) Start() error {
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if this.accepting {
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return nil
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}
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listener, err := internet.ListenTCP(
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this.meta.Address,
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this.meta.Port,
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this.handleConnection,
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this.meta.StreamSettings)
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if err != nil {
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log.Error("Socks: failed to listen on ", this.meta.Address, ":", this.meta.Port, ": ", err)
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return err
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}
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this.accepting = true
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this.tcpMutex.Lock()
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this.tcpListener = listener
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this.tcpMutex.Unlock()
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if this.config.UdpEnabled {
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this.listenUDP()
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2015-10-03 15:42:03 -04:00
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}
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return nil
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}
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func (this *Server) handleConnection(connection internet.Connection) {
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defer connection.Close()
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2016-07-11 09:46:18 -04:00
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timedReader := v2net.NewTimeOutReader(this.config.Timeout, connection)
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reader := v2io.NewBufferedReader(timedReader)
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2016-04-12 15:56:36 -04:00
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defer reader.Release()
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writer := v2io.NewBufferedWriter(connection)
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defer writer.Release()
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2015-09-09 06:13:52 -04:00
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2015-09-19 17:54:36 -04:00
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auth, auth4, err := protocol.ReadAuthentication(reader)
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2015-10-13 07:55:06 -04:00
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if err != nil && err != protocol.Socks4Downgrade {
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if err != io.EOF {
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log.Warning("Socks: failed to read authentication: ", err)
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}
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return
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}
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2016-08-14 17:20:23 -04:00
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clientAddr := v2net.DestinationFromAddr(connection.RemoteAddr())
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if err != nil && err == protocol.Socks4Downgrade {
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this.handleSocks4(clientAddr, reader, writer, auth4)
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2015-09-17 11:37:04 -04:00
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} else {
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this.handleSocks5(clientAddr, reader, writer, auth)
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}
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}
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2016-08-14 11:08:01 -04:00
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func (this *Server) handleSocks5(clientAddr v2net.Destination, reader *v2io.BufferedReader, writer *v2io.BufferedWriter, auth protocol.Socks5AuthenticationRequest) error {
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expectedAuthMethod := protocol.AuthNotRequired
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if this.config.AuthType == AuthType_PASSWORD {
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expectedAuthMethod = protocol.AuthUserPass
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}
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2015-10-03 15:42:03 -04:00
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if !auth.HasAuthMethod(expectedAuthMethod) {
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authResponse := protocol.NewAuthenticationResponse(protocol.AuthNoMatchingMethod)
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err := protocol.WriteAuthentication(writer, authResponse)
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writer.Flush()
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2015-09-15 18:06:22 -04:00
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if err != nil {
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2016-06-03 14:21:46 -04:00
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log.Warning("Socks: failed to write authentication: ", err)
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2015-09-15 18:06:22 -04:00
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return err
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}
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2016-02-05 06:45:31 -05:00
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log.Warning("Socks: client doesn't support any allowed auth methods.")
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2016-08-07 09:32:41 -04:00
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return ErrUnsupportedAuthMethod
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}
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2015-09-17 11:37:04 -04:00
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2015-10-03 15:42:03 -04:00
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authResponse := protocol.NewAuthenticationResponse(expectedAuthMethod)
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protocol.WriteAuthentication(writer, authResponse)
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err := writer.Flush()
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if err != nil {
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2016-01-18 06:24:33 -05:00
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log.Error("Socks: failed to write authentication: ", err)
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2015-10-03 15:42:03 -04:00
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return err
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}
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2016-09-25 16:54:18 -04:00
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if this.config.AuthType == AuthType_PASSWORD {
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2015-10-03 15:42:03 -04:00
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upRequest, err := protocol.ReadUserPassRequest(reader)
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2015-09-16 11:07:05 -04:00
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if err != nil {
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2016-06-03 14:21:46 -04:00
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log.Warning("Socks: failed to read username and password: ", err)
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2015-09-16 11:07:05 -04:00
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return err
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}
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2015-10-03 15:42:03 -04:00
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status := byte(0)
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2015-11-27 15:50:28 -05:00
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if !this.config.HasAccount(upRequest.Username(), upRequest.Password()) {
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2015-10-03 15:42:03 -04:00
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status = byte(0xFF)
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}
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upResponse := protocol.NewSocks5UserPassResponse(status)
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err = protocol.WriteUserPassResponse(writer, upResponse)
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2016-02-27 05:02:42 -05:00
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writer.Flush()
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2015-10-03 15:42:03 -04:00
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if err != nil {
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2016-01-18 06:24:33 -05:00
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log.Error("Socks: failed to write user pass response: ", err)
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2015-10-03 15:42:03 -04:00
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return err
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}
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if status != byte(0) {
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2016-01-18 06:24:33 -05:00
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log.Warning("Socks: Invalid user account: ", upRequest.AuthDetail())
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2016-06-27 02:53:35 -04:00
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log.Access(clientAddr, "", log.AccessRejected, proxy.ErrInvalidAuthentication)
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return proxy.ErrInvalidAuthentication
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2015-10-03 15:42:03 -04:00
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}
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}
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2015-09-09 06:13:52 -04:00
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2015-10-03 15:42:03 -04:00
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request, err := protocol.ReadRequest(reader)
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if err != nil {
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2016-06-03 14:21:46 -04:00
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log.Warning("Socks: failed to read request: ", err)
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2015-10-03 15:42:03 -04:00
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return err
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}
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2015-09-11 08:12:26 -04:00
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2016-08-28 17:46:50 -04:00
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if request.Command == protocol.CmdUdpAssociate && this.config.UdpEnabled {
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2015-11-27 15:50:28 -05:00
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return this.handleUDP(reader, writer)
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2015-10-03 18:21:06 -04:00
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}
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if request.Command == protocol.CmdBind || request.Command == protocol.CmdUdpAssociate {
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2015-10-03 15:42:03 -04:00
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response := protocol.NewSocks5Response()
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response.Error = protocol.ErrorCommandNotSupported
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2015-12-02 15:44:01 -05:00
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response.Port = v2net.Port(0)
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2015-11-06 07:08:20 -05:00
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response.SetIPv4([]byte{0, 0, 0, 0})
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2015-10-08 17:06:12 -04:00
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2016-02-27 05:02:42 -05:00
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response.Write(writer)
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writer.Flush()
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2015-09-16 11:07:05 -04:00
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if err != nil {
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2016-01-18 06:24:33 -05:00
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log.Error("Socks: failed to write response: ", err)
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2015-09-16 11:07:05 -04:00
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return err
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}
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2016-01-18 06:24:33 -05:00
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log.Warning("Socks: Unsupported socks command ", request.Command)
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2016-08-07 09:32:41 -04:00
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return ErrUnsupportedSocksCommand
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2015-10-03 15:42:03 -04:00
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}
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2015-10-13 16:00:12 -04:00
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response := protocol.NewSocks5Response()
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2015-10-03 15:42:03 -04:00
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response.Error = protocol.ErrorSuccess
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2015-10-03 18:21:06 -04:00
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2015-10-05 11:09:57 -04:00
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// Some SOCKS software requires a value other than dest. Let's fake one:
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2015-12-02 15:44:01 -05:00
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response.Port = v2net.Port(1717)
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2015-11-02 18:07:19 -05:00
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response.SetIPv4([]byte{0, 0, 0, 0})
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2015-10-05 11:09:44 -04:00
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2016-02-27 05:02:42 -05:00
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response.Write(writer)
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2015-10-03 15:42:03 -04:00
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if err != nil {
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2016-01-18 06:24:33 -05:00
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log.Error("Socks: failed to write response: ", err)
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2015-10-03 15:42:03 -04:00
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return err
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}
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2016-02-27 05:02:42 -05:00
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reader.SetCached(false)
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writer.SetCached(false)
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2015-10-03 15:42:03 -04:00
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dest := request.Destination()
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2016-08-14 11:08:01 -04:00
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session := &proxy.SessionInfo{
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Source: clientAddr,
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Destination: dest,
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}
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2016-01-18 06:24:33 -05:00
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log.Info("Socks: TCP Connect request to ", dest)
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2016-06-05 09:02:15 -04:00
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log.Access(clientAddr, dest, log.AccessAccepted, "")
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2015-12-12 14:57:47 -05:00
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2016-08-14 11:08:01 -04:00
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this.transport(reader, writer, session)
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2015-10-03 15:42:03 -04:00
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return nil
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}
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2016-04-25 18:33:16 -04:00
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func (this *Server) handleUDP(reader io.Reader, writer *v2io.BufferedWriter) error {
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2015-10-03 18:21:06 -04:00
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response := protocol.NewSocks5Response()
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response.Error = protocol.ErrorSuccess
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2016-01-03 17:30:37 -05:00
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udpAddr := this.udpAddress
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2015-10-03 18:21:06 -04:00
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2016-09-20 05:53:05 -04:00
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response.Port = udpAddr.Port
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switch udpAddr.Address.Family() {
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2016-08-14 12:14:12 -04:00
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case v2net.AddressFamilyIPv4:
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2016-09-20 05:53:05 -04:00
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response.SetIPv4(udpAddr.Address.IP())
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2016-08-14 12:14:12 -04:00
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case v2net.AddressFamilyIPv6:
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2016-09-20 05:53:05 -04:00
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response.SetIPv6(udpAddr.Address.IP())
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2016-08-14 12:14:12 -04:00
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case v2net.AddressFamilyDomain:
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2016-09-20 05:53:05 -04:00
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response.SetDomain(udpAddr.Address.Domain())
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2015-10-03 18:21:06 -04:00
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}
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2015-10-08 17:06:12 -04:00
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2016-02-27 05:02:42 -05:00
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response.Write(writer)
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err := writer.Flush()
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2015-10-08 17:06:12 -04:00
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2015-10-03 18:21:06 -04:00
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if err != nil {
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2016-01-18 06:24:33 -05:00
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log.Error("Socks: failed to write response: ", err)
|
2015-10-03 18:21:06 -04:00
|
|
|
return err
|
|
|
|
}
|
|
|
|
|
2015-10-06 11:24:57 -04:00
|
|
|
// The TCP connection closes after this method returns. We need to wait until
|
|
|
|
// the client closes it.
|
|
|
|
// TODO: get notified from UDP part
|
2015-10-06 05:57:26 -04:00
|
|
|
<-time.After(5 * time.Minute)
|
2015-10-03 18:21:06 -04:00
|
|
|
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
2016-08-14 11:08:01 -04:00
|
|
|
func (this *Server) handleSocks4(clientAddr v2net.Destination, reader *v2io.BufferedReader, writer *v2io.BufferedWriter, auth protocol.Socks4AuthenticationRequest) error {
|
2015-10-03 15:42:03 -04:00
|
|
|
result := protocol.Socks4RequestGranted
|
|
|
|
if auth.Command == protocol.CmdBind {
|
|
|
|
result = protocol.Socks4RequestRejected
|
2015-09-11 08:12:26 -04:00
|
|
|
}
|
2015-10-03 15:42:03 -04:00
|
|
|
socks4Response := protocol.NewSocks4AuthenticationResponse(result, auth.Port, auth.IP[:])
|
2015-10-08 17:06:12 -04:00
|
|
|
|
2016-02-27 05:02:42 -05:00
|
|
|
socks4Response.Write(writer)
|
2015-09-17 11:37:04 -04:00
|
|
|
|
2015-10-03 15:42:03 -04:00
|
|
|
if result == protocol.Socks4RequestRejected {
|
2016-01-18 06:24:33 -05:00
|
|
|
log.Warning("Socks: Unsupported socks 4 command ", auth.Command)
|
2016-08-07 09:32:41 -04:00
|
|
|
log.Access(clientAddr, "", log.AccessRejected, ErrUnsupportedSocksCommand)
|
|
|
|
return ErrUnsupportedSocksCommand
|
2015-10-03 15:42:03 -04:00
|
|
|
}
|
|
|
|
|
2016-02-27 05:02:42 -05:00
|
|
|
reader.SetCached(false)
|
|
|
|
writer.SetCached(false)
|
|
|
|
|
2015-12-16 17:53:38 -05:00
|
|
|
dest := v2net.TCPDestination(v2net.IPAddress(auth.IP[:]), auth.Port)
|
2016-08-14 11:08:01 -04:00
|
|
|
session := &proxy.SessionInfo{
|
|
|
|
Source: clientAddr,
|
|
|
|
Destination: dest,
|
|
|
|
}
|
2016-06-05 09:02:15 -04:00
|
|
|
log.Access(clientAddr, dest, log.AccessAccepted, "")
|
2016-08-14 11:08:01 -04:00
|
|
|
this.transport(reader, writer, session)
|
2015-10-03 15:42:03 -04:00
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
2016-08-14 11:08:01 -04:00
|
|
|
func (this *Server) transport(reader io.Reader, writer io.Writer, session *proxy.SessionInfo) {
|
|
|
|
ray := this.packetDispatcher.DispatchToOutbound(this.meta, session)
|
2015-09-10 18:24:18 -04:00
|
|
|
input := ray.InboundInput()
|
|
|
|
output := ray.InboundOutput()
|
|
|
|
|
2016-08-28 05:59:03 -04:00
|
|
|
defer input.Close()
|
|
|
|
defer output.Release()
|
2015-09-09 06:13:52 -04:00
|
|
|
|
2015-11-27 15:50:28 -05:00
|
|
|
go func() {
|
2016-04-18 13:01:24 -04:00
|
|
|
v2reader := v2io.NewAdaptiveReader(reader)
|
|
|
|
defer v2reader.Release()
|
|
|
|
|
|
|
|
v2io.Pipe(v2reader, input)
|
2016-08-28 06:01:37 -04:00
|
|
|
input.Close()
|
2015-11-27 15:50:28 -05:00
|
|
|
}()
|
2015-09-10 18:24:18 -04:00
|
|
|
|
2016-08-28 05:59:03 -04:00
|
|
|
v2writer := v2io.NewAdaptiveWriter(writer)
|
|
|
|
defer v2writer.Release()
|
2016-04-18 13:01:24 -04:00
|
|
|
|
2016-08-28 05:59:03 -04:00
|
|
|
v2io.Pipe(output, v2writer)
|
|
|
|
output.Release()
|
2015-09-10 18:24:18 -04:00
|
|
|
}
|
2016-04-25 18:35:42 -04:00
|
|
|
|
2016-06-14 16:54:08 -04:00
|
|
|
type ServerFactory struct{}
|
|
|
|
|
2016-10-02 17:43:58 -04:00
|
|
|
func (this *ServerFactory) StreamCapability() v2net.NetworkList {
|
|
|
|
return v2net.NetworkList{
|
|
|
|
Network: []v2net.Network{v2net.Network_RawTCP},
|
|
|
|
}
|
2016-06-14 16:54:08 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
func (this *ServerFactory) Create(space app.Space, rawConfig interface{}, meta *proxy.InboundHandlerMeta) (proxy.InboundHandler, error) {
|
2016-08-28 17:46:50 -04:00
|
|
|
return NewServer(rawConfig.(*ServerConfig), space, meta), nil
|
2016-06-14 16:54:08 -04:00
|
|
|
}
|
|
|
|
|
2016-04-25 18:35:42 -04:00
|
|
|
func init() {
|
2016-10-16 08:22:21 -04:00
|
|
|
registry.MustRegisterInboundHandlerCreator(loader.GetType(new(ServerConfig)), new(ServerFactory))
|
2016-04-25 18:35:42 -04:00
|
|
|
}
|