mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-12-22 18:17:52 -05:00
283 lines
7.9 KiB
Go
283 lines
7.9 KiB
Go
package socks
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import (
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"errors"
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"io"
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"net"
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"sync"
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"time"
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"github.com/v2ray/v2ray-core/app"
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"github.com/v2ray/v2ray-core/common/alloc"
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"github.com/v2ray/v2ray-core/common/log"
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v2net "github.com/v2ray/v2ray-core/common/net"
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"github.com/v2ray/v2ray-core/common/retry"
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"github.com/v2ray/v2ray-core/proxy"
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jsonconfig "github.com/v2ray/v2ray-core/proxy/socks/config/json"
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"github.com/v2ray/v2ray-core/proxy/socks/protocol"
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)
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var (
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UnsupportedSocksCommand = errors.New("Unsupported socks command.")
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UnsupportedAuthMethod = errors.New("Unsupported auth method.")
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)
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// SocksServer is a SOCKS 5 proxy server
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type SocksServer struct {
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accepting bool
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dispatcher app.PacketDispatcher
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config *jsonconfig.SocksConfig
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}
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func NewSocksServer(dispatcher app.PacketDispatcher, config *jsonconfig.SocksConfig) *SocksServer {
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return &SocksServer{
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dispatcher: dispatcher,
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config: config,
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}
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}
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func (server *SocksServer) Listen(port uint16) error {
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listener, err := net.ListenTCP("tcp", &net.TCPAddr{
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IP: []byte{0, 0, 0, 0},
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Port: int(port),
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Zone: "",
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})
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if err != nil {
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log.Error("Socks failed to listen on port %d: %v", port, err)
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return err
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}
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server.accepting = true
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go server.AcceptConnections(listener)
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if server.config.UDPEnabled {
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server.ListenUDP(port)
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}
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return nil
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}
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func (server *SocksServer) AcceptConnections(listener *net.TCPListener) {
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for server.accepting {
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retry.Timed(100 /* times */, 100 /* ms */).On(func() error {
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connection, err := listener.AcceptTCP()
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if err != nil {
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log.Error("Socks failed to accept new connection %v", err)
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return err
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}
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go server.HandleConnection(connection)
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return nil
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})
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}
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}
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func (server *SocksServer) HandleConnection(connection *net.TCPConn) error {
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defer connection.Close()
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reader := v2net.NewTimeOutReader(120, connection)
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auth, auth4, err := protocol.ReadAuthentication(reader)
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if err != nil && err != protocol.Socks4Downgrade {
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log.Error("Socks failed to read authentication: %v", err)
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return err
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}
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if err != nil && err == protocol.Socks4Downgrade {
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return server.handleSocks4(reader, connection, auth4)
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} else {
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return server.handleSocks5(reader, connection, auth)
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}
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}
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func (server *SocksServer) handleSocks5(reader *v2net.TimeOutReader, writer io.Writer, auth protocol.Socks5AuthenticationRequest) error {
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expectedAuthMethod := protocol.AuthNotRequired
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if server.config.IsPassword() {
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expectedAuthMethod = protocol.AuthUserPass
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}
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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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if err != nil {
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log.Error("Socks failed to write authentication: %v", err)
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return err
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}
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log.Warning("Socks client doesn't support allowed any auth methods.")
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return UnsupportedAuthMethod
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}
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authResponse := protocol.NewAuthenticationResponse(expectedAuthMethod)
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err := protocol.WriteAuthentication(writer, authResponse)
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if err != nil {
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log.Error("Socks failed to write authentication: %v", err)
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return err
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}
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if server.config.IsPassword() {
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upRequest, err := protocol.ReadUserPassRequest(reader)
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if err != nil {
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log.Error("Socks failed to read username and password: %v", err)
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return err
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}
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status := byte(0)
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if !server.config.HasAccount(upRequest.Username(), upRequest.Password()) {
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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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if err != nil {
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log.Error("Socks failed to write user pass response: %v", err)
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return err
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}
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if status != byte(0) {
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log.Warning("Invalid user account: %s", upRequest.AuthDetail())
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return proxy.InvalidAuthentication
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}
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}
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request, err := protocol.ReadRequest(reader)
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if err != nil {
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log.Error("Socks failed to read request: %v", err)
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return err
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}
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if request.Command == protocol.CmdUdpAssociate && server.config.UDPEnabled {
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return server.handleUDP(reader, writer)
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}
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if request.Command == protocol.CmdBind || request.Command == protocol.CmdUdpAssociate {
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response := protocol.NewSocks5Response()
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response.Error = protocol.ErrorCommandNotSupported
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responseBuffer := alloc.NewSmallBuffer().Clear()
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response.Write(responseBuffer)
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_, err = writer.Write(responseBuffer.Value)
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responseBuffer.Release()
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if err != nil {
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log.Error("Socks failed to write response: %v", err)
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return err
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}
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log.Warning("Unsupported socks command %d", request.Command)
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return UnsupportedSocksCommand
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}
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response := protocol.NewSocks5Response()
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response.Error = protocol.ErrorSuccess
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// Some SOCKS software requires a value other than dest. Let's fake one:
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response.Port = uint16(1717)
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response.AddrType = protocol.AddrTypeIPv4
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response.IPv4[0] = 0
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response.IPv4[1] = 0
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response.IPv4[2] = 0
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response.IPv4[3] = 0
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responseBuffer := alloc.NewSmallBuffer().Clear()
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response.Write(responseBuffer)
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_, err = writer.Write(responseBuffer.Value)
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responseBuffer.Release()
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if err != nil {
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log.Error("Socks failed to write response: %v", err)
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return err
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}
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dest := request.Destination()
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data, err := v2net.ReadFrom(reader, nil)
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if err != nil {
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return err
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}
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packet := v2net.NewPacket(dest, data, true)
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server.transport(reader, writer, packet)
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return nil
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}
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func (server *SocksServer) handleUDP(reader *v2net.TimeOutReader, writer io.Writer) error {
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response := protocol.NewSocks5Response()
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response.Error = protocol.ErrorSuccess
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udpAddr := server.getUDPAddr()
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response.Port = udpAddr.Port()
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switch {
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case udpAddr.IsIPv4():
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response.AddrType = protocol.AddrTypeIPv4
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copy(response.IPv4[:], udpAddr.IP())
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case udpAddr.IsIPv6():
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response.AddrType = protocol.AddrTypeIPv6
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copy(response.IPv6[:], udpAddr.IP())
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case udpAddr.IsDomain():
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response.AddrType = protocol.AddrTypeDomain
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response.Domain = udpAddr.Domain()
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}
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responseBuffer := alloc.NewSmallBuffer().Clear()
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response.Write(responseBuffer)
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_, err := writer.Write(responseBuffer.Value)
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responseBuffer.Release()
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if err != nil {
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log.Error("Socks failed to write response: %v", err)
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return err
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}
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reader.SetTimeOut(300) /* 5 minutes */
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v2net.ReadFrom(reader, nil) // Just in case of anything left in the socket
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// The TCP connection closes after this method returns. We need to wait until
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// the client closes it.
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// TODO: get notified from UDP part
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<-time.After(5 * time.Minute)
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return nil
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}
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func (server *SocksServer) handleSocks4(reader io.Reader, writer io.Writer, auth protocol.Socks4AuthenticationRequest) error {
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result := protocol.Socks4RequestGranted
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if auth.Command == protocol.CmdBind {
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result = protocol.Socks4RequestRejected
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}
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socks4Response := protocol.NewSocks4AuthenticationResponse(result, auth.Port, auth.IP[:])
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responseBuffer := alloc.NewSmallBuffer().Clear()
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socks4Response.Write(responseBuffer)
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writer.Write(responseBuffer.Value)
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responseBuffer.Release()
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if result == protocol.Socks4RequestRejected {
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log.Warning("Unsupported socks 4 command %d", auth.Command)
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return UnsupportedSocksCommand
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}
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dest := v2net.NewTCPDestination(v2net.IPAddress(auth.IP[:], auth.Port))
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data, err := v2net.ReadFrom(reader, nil)
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if err != nil {
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return err
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}
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packet := v2net.NewPacket(dest, data, true)
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server.transport(reader, writer, packet)
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return nil
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}
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func (server *SocksServer) transport(reader io.Reader, writer io.Writer, firstPacket v2net.Packet) {
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ray := server.dispatcher.DispatchToOutbound(firstPacket)
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input := ray.InboundInput()
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output := ray.InboundOutput()
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var inputFinish, outputFinish sync.Mutex
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inputFinish.Lock()
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outputFinish.Lock()
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go dumpInput(reader, input, &inputFinish)
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go dumpOutput(writer, output, &outputFinish)
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outputFinish.Lock()
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}
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func dumpInput(reader io.Reader, input chan<- *alloc.Buffer, finish *sync.Mutex) {
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v2net.ReaderToChan(input, reader)
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finish.Unlock()
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close(input)
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}
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func dumpOutput(writer io.Writer, output <-chan *alloc.Buffer, finish *sync.Mutex) {
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v2net.ChanToWriter(writer, output)
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finish.Unlock()
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}
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