mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-10-01 00:06:11 -04:00
140 lines
3.8 KiB
Go
140 lines
3.8 KiB
Go
package socks
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import (
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"errors"
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"net"
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"strconv"
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"github.com/v2ray/v2ray-core"
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socksio "github.com/v2ray/v2ray-core/io/socks"
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"github.com/v2ray/v2ray-core/log"
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v2net "github.com/v2ray/v2ray-core/net"
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)
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var (
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ErrorAuthenticationFailed = errors.New("None of the authentication methods is allowed.")
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ErrorCommandNotSupported = errors.New("Client requested an unsupported command.")
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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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vPoint *core.Point
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config SocksConfig
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}
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func NewSocksServer(vp *core.Point, rawConfig []byte) *SocksServer {
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server := new(SocksServer)
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server.vPoint = vp
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config, err := loadConfig(rawConfig)
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if err != nil {
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panic(log.Error("Unable to load socks config: %v", err))
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}
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server.config = config
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return server
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}
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func (server *SocksServer) Listen(port uint16) error {
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listener, err := net.Listen("tcp", ":"+strconv.Itoa(int(port)))
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if err != nil {
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log.Error("Error on listening port %d: %v", port, err)
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return err
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}
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log.Debug("Working on tcp:%d", port)
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server.accepting = true
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go server.AcceptConnections(listener)
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return nil
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}
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func (server *SocksServer) AcceptConnections(listener net.Listener) error {
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for server.accepting {
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connection, err := listener.Accept()
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if err != nil {
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log.Error("Error on accepting socks 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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}
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return nil
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}
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func (server *SocksServer) HandleConnection(connection net.Conn) error {
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defer connection.Close()
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auth, err := socksio.ReadAuthentication(connection)
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if err != nil {
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log.Error("Error on reading authentication: %v", err)
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return err
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}
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expectedAuthMethod := socksio.AuthNotRequired
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if server.config.AuthMethod == JsonAuthMethodUserPass {
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expectedAuthMethod = socksio.AuthUserPass
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}
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if !auth.HasAuthMethod(expectedAuthMethod) {
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authResponse := socksio.NewAuthenticationResponse(socksio.AuthNoMatchingMethod)
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socksio.WriteAuthentication(connection, authResponse)
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log.Warning("Client doesn't support allowed any auth methods.")
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return ErrorAuthenticationFailed
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}
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authResponse := socksio.NewAuthenticationResponse(socksio.AuthNotRequired)
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socksio.WriteAuthentication(connection, authResponse)
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request, err := socksio.ReadRequest(connection)
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if err != nil {
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log.Error("Error on reading socks request: %v", err)
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return err
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}
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response := socksio.NewSocks5Response()
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if request.Command == socksio.CmdBind || request.Command == socksio.CmdUdpAssociate {
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response := socksio.NewSocks5Response()
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response.Error = socksio.ErrorCommandNotSupported
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socksio.WriteResponse(connection, response)
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log.Warning("Unsupported socks command %d", request.Command)
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return ErrorCommandNotSupported
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}
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response.Error = socksio.ErrorSuccess
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response.Port = request.Port
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response.AddrType = request.AddrType
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switch response.AddrType {
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case socksio.AddrTypeIPv4:
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copy(response.IPv4[:], request.IPv4[:])
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case socksio.AddrTypeIPv6:
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copy(response.IPv6[:], request.IPv6[:])
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case socksio.AddrTypeDomain:
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response.Domain = request.Domain
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}
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socksio.WriteResponse(connection, response)
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ray := server.vPoint.NewInboundConnectionAccepted(request.Destination())
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input := ray.InboundInput()
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output := ray.InboundOutput()
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readFinish := make(chan bool)
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writeFinish := make(chan bool)
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go server.dumpInput(connection, input, readFinish)
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go server.dumpOutput(connection, output, writeFinish)
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<-writeFinish
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return nil
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}
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func (server *SocksServer) dumpInput(conn net.Conn, input chan<- []byte, finish chan<- bool) {
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v2net.ReaderToChan(input, conn)
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close(input)
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log.Debug("Socks input closed")
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finish <- true
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}
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func (server *SocksServer) dumpOutput(conn net.Conn, output <-chan []byte, finish chan<- bool) {
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v2net.ChanToWriter(conn, output)
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log.Debug("Socks output closed")
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finish <- true
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}
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