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socks.go
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socks.go
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package socks
import (
"io"
"net"
"strconv"
"sync"
"github.com/v2ray/v2ray-core"
"github.com/v2ray/v2ray-core/common/errors"
"github.com/v2ray/v2ray-core/common/log"
v2net "github.com/v2ray/v2ray-core/common/net"
jsonconfig "github.com/v2ray/v2ray-core/proxy/socks/config/json"
"github.com/v2ray/v2ray-core/proxy/socks/protocol"
)
// SocksServer is a SOCKS 5 proxy server
type SocksServer struct {
accepting bool
vPoint *core.Point
config jsonconfig.SocksConfig
}
func NewSocksServer(vp *core.Point, rawConfig []byte) *SocksServer {
config, err := jsonconfig.Load(rawConfig)
if err != nil {
log.Error("Unable to load socks config: %v", err)
panic(errors.NewConfigurationError())
}
return &SocksServer{
vPoint: vp,
config: config,
}
}
func (server *SocksServer) Listen(port uint16) error {
listener, err := net.Listen("tcp", ":"+strconv.Itoa(int(port)))
if err != nil {
log.Error("Socks failed to listen on port %d: %v", port, err)
return err
}
server.accepting = true
go server.AcceptConnections(listener)
return nil
}
func (server *SocksServer) AcceptConnections(listener net.Listener) {
for server.accepting {
connection, err := listener.Accept()
if err != nil {
log.Error("Socks failed to accept new connection %v", err)
return
}
go server.HandleConnection(connection)
}
}
func (server *SocksServer) HandleConnection(connection net.Conn) error {
defer connection.Close()
reader := v2net.NewTimeOutReader(4, connection)
auth, auth4, err := protocol.ReadAuthentication(reader)
if err != nil && !errors.HasCode(err, 1000) {
log.Error("Socks failed to read authentication: %v", err)
return err
}
var dest v2net.Destination
// TODO refactor this part
if errors.HasCode(err, 1000) {
result := protocol.Socks4RequestGranted
if auth4.Command == protocol.CmdBind {
result = protocol.Socks4RequestRejected
}
socks4Response := protocol.NewSocks4AuthenticationResponse(result, auth4.Port, auth4.IP[:])
connection.Write(socks4Response.ToBytes(nil))
if result == protocol.Socks4RequestRejected {
return errors.NewInvalidOperationError("Socks4 command " + strconv.Itoa(int(auth4.Command)))
}
dest = v2net.NewTCPDestination(v2net.IPAddress(auth4.IP[:], auth4.Port))
} else {
expectedAuthMethod := protocol.AuthNotRequired
if server.config.IsPassword() {
expectedAuthMethod = protocol.AuthUserPass
}
if !auth.HasAuthMethod(expectedAuthMethod) {
authResponse := protocol.NewAuthenticationResponse(protocol.AuthNoMatchingMethod)
err = protocol.WriteAuthentication(connection, authResponse)
if err != nil {
log.Error("Socks failed to write authentication: %v", err)
return err
}
log.Warning("Socks client doesn't support allowed any auth methods.")
return errors.NewInvalidOperationError("Unsupported auth methods.")
}
authResponse := protocol.NewAuthenticationResponse(expectedAuthMethod)
err = protocol.WriteAuthentication(connection, authResponse)
if err != nil {
log.Error("Socks failed to write authentication: %v", err)
return err
}
if server.config.IsPassword() {
upRequest, err := protocol.ReadUserPassRequest(reader)
if err != nil {
log.Error("Socks failed to read username and password: %v", err)
return err
}
status := byte(0)
if !upRequest.IsValid(server.config.Username, server.config.Password) {
status = byte(0xFF)
}
upResponse := protocol.NewSocks5UserPassResponse(status)
err = protocol.WriteUserPassResponse(connection, upResponse)
if err != nil {
log.Error("Socks failed to write user pass response: %v", err)
return err
}
if status != byte(0) {
err = errors.NewAuthenticationError(upRequest.AuthDetail())
log.Warning(err.Error())
return err
}
}
request, err := protocol.ReadRequest(reader)
if err != nil {
log.Error("Socks failed to read request: %v", err)
return err
}
response := protocol.NewSocks5Response()
if request.Command == protocol.CmdBind || request.Command == protocol.CmdUdpAssociate {
response := protocol.NewSocks5Response()
response.Error = protocol.ErrorCommandNotSupported
err = protocol.WriteResponse(connection, response)
if err != nil {
log.Error("Socks failed to write response: %v", err)
return err
}
log.Warning("Unsupported socks command %d", request.Command)
return errors.NewInvalidOperationError("Socks command " + strconv.Itoa(int(request.Command)))
}
response.Error = protocol.ErrorSuccess
response.Port = request.Port
response.AddrType = request.AddrType
switch response.AddrType {
case protocol.AddrTypeIPv4:
copy(response.IPv4[:], request.IPv4[:])
case protocol.AddrTypeIPv6:
copy(response.IPv6[:], request.IPv6[:])
case protocol.AddrTypeDomain:
response.Domain = request.Domain
}
err = protocol.WriteResponse(connection, response)
if err != nil {
log.Error("Socks failed to write response: %v", err)
return err
}
dest = request.Destination()
}
ray := server.vPoint.DispatchToOutbound(v2net.NewTCPPacket(dest))
input := ray.InboundInput()
output := ray.InboundOutput()
var readFinish, writeFinish sync.Mutex
readFinish.Lock()
writeFinish.Lock()
go dumpInput(reader, input, &readFinish)
go dumpOutput(connection, output, &writeFinish)
writeFinish.Lock()
return nil
}
func dumpInput(reader io.Reader, input chan<- []byte, finish *sync.Mutex) {
v2net.ReaderToChan(input, reader)
finish.Unlock()
close(input)
}
func dumpOutput(writer io.Writer, output <-chan []byte, finish *sync.Mutex) {
v2net.ChanToWriter(writer, output)
finish.Unlock()
}