refactor: merge sock4 and socks5 into one
This commit is contained in:
KujouRinka
parent
1ae0455fd5
commit
ff27ee512a
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@ -8,8 +8,24 @@ import (
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)
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const (
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SocksInvalid = iota
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Socks4
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Socks4A
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Socks5
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Socks4Version = 0x04
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Socks5Version = 0x05
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Socks4ReplyVN = 0x00
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Socks4CmdTCPConnect = 0x01
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Socks4CmdTCPBind = 0x02
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Socks4ReqGranted = 0x5A
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Socks4ReqRejectOrFailed = 0x5B
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Socks4ReqRejectIdentd = 0x5C
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Socks4ReqRejectUser = 0x5D
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Socks5CmdTCPConnect = 0x01
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Socks5CmdTCPBind = 0x02
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Socks5CmdUDPAssociate = 0x03
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@ -26,24 +42,24 @@ const (
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Socks5AddrTypeIPv6 = 0x04
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)
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var _ analyzer.Analyzer = (*Socks5Analyzer)(nil)
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var _ analyzer.Analyzer = (*SocksAnalyzer)(nil)
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type Socks5Analyzer struct{}
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type SocksAnalyzer struct{}
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func (a *Socks5Analyzer) Name() string {
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return "socks5"
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func (a *SocksAnalyzer) Name() string {
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return "socks"
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}
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func (a *Socks5Analyzer) Limit() int {
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// TODO: more precise calculate
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return 1298
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func (a *SocksAnalyzer) Limit() int {
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// Socks4 length limit cannot be predicted
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return 0
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}
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func (a *Socks5Analyzer) NewTCP(info analyzer.TCPInfo, logger analyzer.Logger) analyzer.TCPStream {
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return newSocks5Stream(logger)
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func (a *SocksAnalyzer) NewTCP(info analyzer.TCPInfo, logger analyzer.Logger) analyzer.TCPStream {
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return newSocksStream(logger)
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}
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type socks5Stream struct {
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type socksStream struct {
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logger analyzer.Logger
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reqBuf *utils.ByteBuffer
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@ -58,6 +74,8 @@ type socks5Stream struct {
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respLSM *utils.LinearStateMachine
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respDone bool
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version int
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authReqMethod int
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authUsername string
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authPassword string
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@ -65,23 +83,18 @@ type socks5Stream struct {
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authRespMethod int
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}
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func newSocks5Stream(logger analyzer.Logger) *socks5Stream {
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s := &socks5Stream{logger: logger, reqBuf: &utils.ByteBuffer{}, respBuf: &utils.ByteBuffer{}}
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func newSocksStream(logger analyzer.Logger) *socksStream {
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s := &socksStream{logger: logger, reqBuf: &utils.ByteBuffer{}, respBuf: &utils.ByteBuffer{}}
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s.reqLSM = utils.NewLinearStateMachine(
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s.parseSocks5ReqVersion,
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s.parseSocks5ReqMethod,
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s.parseSocks5ReqAuth,
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s.parseSocks5ReqConnInfo,
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s.parseSocksReqVersion,
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)
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s.respLSM = utils.NewLinearStateMachine(
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s.parseSocks5RespVerAndMethod,
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s.parseSocks5RespAuth,
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s.parseSocks5RespConnInfo,
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s.parseSocksRespVersion,
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)
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return s
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}
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func (s *socks5Stream) Feed(rev, start, end bool, skip int, data []byte) (u *analyzer.PropUpdate, d bool) {
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func (s *socksStream) Feed(rev, start, end bool, skip int, data []byte) (u *analyzer.PropUpdate, d bool) {
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if skip != 0 {
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return nil, true
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}
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@ -108,15 +121,19 @@ func (s *socks5Stream) Feed(rev, start, end bool, skip int, data []byte) (u *ana
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if s.reqUpdated {
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update = &analyzer.PropUpdate{
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Type: analyzer.PropUpdateMerge,
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M: analyzer.PropMap{"req": s.reqMap},
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M: analyzer.PropMap{
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"version": s.socksVersion(),
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"req": s.reqMap,
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},
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}
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s.reqUpdated = false
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}
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}
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return update, cancelled || (s.reqDone && s.respDone)
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}
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func (s *socks5Stream) Close(limited bool) *analyzer.PropUpdate {
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func (s *socksStream) Close(limited bool) *analyzer.PropUpdate {
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s.reqBuf.Reset()
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s.respBuf.Reset()
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s.reqMap = nil
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@ -124,18 +141,58 @@ func (s *socks5Stream) Close(limited bool) *analyzer.PropUpdate {
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return nil
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}
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func (s *socks5Stream) parseSocks5ReqVersion() utils.LSMAction {
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func (s *socksStream) parseSocksReqVersion() utils.LSMAction {
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socksVer, ok := s.reqBuf.GetByte(true)
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if !ok {
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return utils.LSMActionPause
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}
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if socksVer != Socks5Version {
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if socksVer != Socks4Version && socksVer != Socks5Version {
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return utils.LSMActionCancel
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}
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s.reqMap = make(analyzer.PropMap)
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s.reqUpdated = true
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if socksVer == Socks4Version {
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s.version = Socks4
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s.reqLSM.AppendSteps(
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s.parseSocks4ReqIpAndPort,
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s.parseSocks4ReqUserId,
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s.parseSocks4ReqHostname,
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)
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} else {
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s.version = Socks5
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s.reqLSM.AppendSteps(
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s.parseSocks5ReqMethod,
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s.parseSocks5ReqAuth,
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s.parseSocks5ReqConnInfo,
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)
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}
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return utils.LSMActionNext
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}
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func (s *socks5Stream) parseSocks5ReqMethod() utils.LSMAction {
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func (s *socksStream) parseSocksRespVersion() utils.LSMAction {
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socksVer, ok := s.respBuf.GetByte(true)
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if !ok {
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return utils.LSMActionPause
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}
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if (s.version == Socks4 || s.version == Socks4A) && socksVer != Socks4ReplyVN ||
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s.version == Socks5 && socksVer != Socks5Version || s.version == SocksInvalid {
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return utils.LSMActionCancel
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}
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if socksVer == Socks4ReplyVN {
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s.respLSM.AppendSteps(
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s.parseSocks4RespPacket,
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)
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} else {
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s.respLSM.AppendSteps(
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s.parseSocks5RespMethod,
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s.parseSocks5RespAuth,
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s.parseSocks5RespConnInfo,
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)
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}
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return utils.LSMActionNext
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}
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func (s *socksStream) parseSocks5ReqMethod() utils.LSMAction {
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nMethods, ok := s.reqBuf.GetByte(false)
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if !ok {
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return utils.LSMActionPause
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@ -159,11 +216,10 @@ func (s *socks5Stream) parseSocks5ReqMethod() utils.LSMAction {
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// TODO: more auth method to support
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}
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}
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s.reqMap = make(analyzer.PropMap)
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return utils.LSMActionNext
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}
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func (s *socks5Stream) parseSocks5ReqAuth() utils.LSMAction {
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func (s *socksStream) parseSocks5ReqAuth() utils.LSMAction {
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switch s.authReqMethod {
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case Socks5AuthNotRequired:
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s.reqMap["auth"] = analyzer.PropMap{"method": s.authReqMethod}
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@ -199,7 +255,7 @@ func (s *socks5Stream) parseSocks5ReqAuth() utils.LSMAction {
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return utils.LSMActionNext
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}
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func (s *socks5Stream) parseSocks5ReqConnInfo() utils.LSMAction {
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func (s *socksStream) parseSocks5ReqConnInfo() utils.LSMAction {
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/* preInfo struct
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+----+-----+-------+------+-------------+
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|VER | CMD | RSV | ATYP | DST.ADDR(1) |
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@ -263,20 +319,17 @@ func (s *socks5Stream) parseSocks5ReqConnInfo() utils.LSMAction {
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return utils.LSMActionNext
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}
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func (s *socks5Stream) parseSocks5RespVerAndMethod() utils.LSMAction {
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verAndMethod, ok := s.respBuf.Get(2, true)
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func (s *socksStream) parseSocks5RespMethod() utils.LSMAction {
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method, ok := s.respBuf.Get(1, true)
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if !ok {
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return utils.LSMActionPause
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}
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if verAndMethod[0] != Socks5Version {
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return utils.LSMActionCancel
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}
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s.authRespMethod = int(verAndMethod[1])
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s.authRespMethod = int(method[0])
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s.respMap = make(analyzer.PropMap)
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return utils.LSMActionNext
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}
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func (s *socks5Stream) parseSocks5RespAuth() utils.LSMAction {
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func (s *socksStream) parseSocks5RespAuth() utils.LSMAction {
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switch s.authRespMethod {
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case Socks5AuthNotRequired:
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s.respMap["auth"] = analyzer.PropMap{"method": s.authRespMethod}
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@ -300,7 +353,7 @@ func (s *socks5Stream) parseSocks5RespAuth() utils.LSMAction {
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return utils.LSMActionNext
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}
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func (s *socks5Stream) parseSocks5RespConnInfo() utils.LSMAction {
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func (s *socksStream) parseSocks5RespConnInfo() utils.LSMAction {
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/* preInfo struct
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+----+-----+-------+------+-------------+
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|VER | REP | RSV | ATYP | BND.ADDR(1) |
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@ -360,3 +413,96 @@ func (s *socks5Stream) parseSocks5RespConnInfo() utils.LSMAction {
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s.respUpdated = true
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return utils.LSMActionNext
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}
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func (s *socksStream) parseSocks4ReqIpAndPort() utils.LSMAction {
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/* Following field will be parsed in this state:
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+-----+----------+--------+
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| CMD | DST.PORT | DST.IP |
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+-----+----------+--------+
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*/
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pkt, ok := s.reqBuf.Get(7, true)
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if !ok {
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return utils.LSMActionPause
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}
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if pkt[0] != Socks4CmdTCPConnect && pkt[0] != Socks4CmdTCPBind {
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return utils.LSMActionCancel
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}
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dstPort := uint16(pkt[1])<<8 | uint16(pkt[2])
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dstIp := net.IPv4(pkt[3], pkt[4], pkt[5], pkt[6]).String()
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// Socks4a extension
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if pkt[3] == 0 && pkt[4] == 0 && pkt[5] == 0 {
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s.version = Socks4A
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}
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s.reqMap["cmd"] = pkt[0]
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s.reqMap["addr"] = dstIp
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s.reqMap["addr_type"] = Socks5AddrTypeIPv4
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s.reqMap["port"] = dstPort
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s.reqUpdated = true
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return utils.LSMActionNext
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}
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func (s *socksStream) parseSocks4ReqUserId() utils.LSMAction {
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userIdSlice, ok := s.reqBuf.GetUntil([]byte("\x00"), true, true)
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if !ok {
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return utils.LSMActionPause
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}
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userId := string(userIdSlice[:len(userIdSlice)-1])
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s.reqMap["auth"] = analyzer.PropMap{
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"user_id": userId,
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}
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s.reqUpdated = true
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return utils.LSMActionNext
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}
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func (s *socksStream) parseSocks4ReqHostname() utils.LSMAction {
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// Only Socks4a support hostname
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if s.version != Socks4A {
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return utils.LSMActionNext
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}
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hostnameSlice, ok := s.reqBuf.GetUntil([]byte("\x00"), true, true)
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if !ok {
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return utils.LSMActionPause
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}
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hostname := string(hostnameSlice[:len(hostnameSlice)-1])
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s.reqMap["addr"] = hostname
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s.reqMap["addr_type"] = Socks5AddrTypeDomain
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s.reqUpdated = true
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return utils.LSMActionNext
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}
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func (s *socksStream) parseSocks4RespPacket() utils.LSMAction {
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pkt, ok := s.respBuf.Get(7, true)
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if !ok {
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return utils.LSMActionPause
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}
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if pkt[0] != Socks4ReqGranted &&
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pkt[0] != Socks4ReqRejectOrFailed &&
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pkt[0] != Socks4ReqRejectIdentd &&
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pkt[0] != Socks4ReqRejectUser {
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return utils.LSMActionCancel
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}
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dstPort := uint16(pkt[1])<<8 | uint16(pkt[2])
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dstIp := net.IPv4(pkt[3], pkt[4], pkt[5], pkt[6]).String()
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s.respMap = analyzer.PropMap{
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"rep": pkt[0],
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"addr": dstIp,
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"addr_type": Socks5AddrTypeIPv4,
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"port": dstPort,
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}
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s.respUpdated = true
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return utils.LSMActionNext
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}
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func (s *socksStream) socksVersion() int {
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switch s.version {
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case Socks4, Socks4A:
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return Socks4Version
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case Socks5:
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return Socks5Version
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default:
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return SocksInvalid
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}
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}
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@ -1,196 +0,0 @@
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package tcp
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import (
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"net"
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"github.com/apernet/OpenGFW/analyzer"
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"github.com/apernet/OpenGFW/analyzer/utils"
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)
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const (
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Socks4Version = 0x04
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Socks4ReplyVN = 0x00
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Socks4CmdTCPConnect = 0x01
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Socks4CmdTCPBind = 0x02
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Socks4ReqGranted = 0x5A
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Socks4ReqRejectOrFailed = 0x5B
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Socks4ReqRejectIdentd = 0x5C
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Socks4ReqRejectUser = 0x5D
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)
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var _ analyzer.Analyzer = (*Socks4Analyzer)(nil)
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type Socks4Analyzer struct{}
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func (a *Socks4Analyzer) Name() string {
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return "socks4"
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}
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func (a *Socks4Analyzer) Limit() int {
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// TODO: should set a value to avoid buffer overflow attack
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// ref: https://www.tenable.com/plugins/nessus/11126
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return 0
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}
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func (a *Socks4Analyzer) NewTCP(info analyzer.TCPInfo, logger analyzer.Logger) analyzer.TCPStream {
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return newSocks4Stream(logger)
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}
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type socks4Stream struct {
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logger analyzer.Logger
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reqBuf *utils.ByteBuffer
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reqMap analyzer.PropMap
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reqUpdated bool
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reqLSM *utils.LinearStateMachine
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reqDone bool
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respBuf *utils.ByteBuffer
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respMap analyzer.PropMap
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respUpdated bool
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respLSM *utils.LinearStateMachine
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respDone bool
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isSocks4a bool
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}
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func newSocks4Stream(logger analyzer.Logger) *socks4Stream {
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s := &socks4Stream{logger: logger, reqBuf: &utils.ByteBuffer{}, respBuf: &utils.ByteBuffer{}}
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s.reqLSM = utils.NewLinearStateMachine(
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s.parseReqIpAndPort,
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s.parseReqUserId,
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s.parseReqHostname,
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)
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s.respLSM = utils.NewLinearStateMachine(
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s.parseRespPacket,
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)
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return s
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}
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func (s *socks4Stream) Feed(rev, start, end bool, skip int, data []byte) (u *analyzer.PropUpdate, d bool) {
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if skip != 0 {
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return nil, true
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}
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if len(data) == 0 {
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return nil, false
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}
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var update *analyzer.PropUpdate
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var cancelled bool
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if rev {
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s.respBuf.Append(data)
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s.respUpdated = false
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cancelled, s.respDone = s.respLSM.Run()
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if s.respUpdated {
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update = &analyzer.PropUpdate{
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Type: analyzer.PropUpdateMerge,
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M: analyzer.PropMap{"resp": s.respMap},
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}
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s.respUpdated = false
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}
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} else {
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s.reqBuf.Append(data)
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s.reqUpdated = false
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cancelled, s.reqDone = s.reqLSM.Run()
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if s.reqUpdated {
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update = &analyzer.PropUpdate{
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Type: analyzer.PropUpdateMerge,
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M: analyzer.PropMap{"req": s.reqMap},
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}
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s.reqUpdated = false
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}
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}
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return update, cancelled || (s.reqDone && s.respDone)
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}
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func (s *socks4Stream) Close(limited bool) *analyzer.PropUpdate {
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s.reqBuf.Reset()
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s.respBuf.Reset()
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s.reqMap = nil
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s.respMap = nil
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return nil
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}
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func (s *socks4Stream) parseReqIpAndPort() utils.LSMAction {
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/* Following field will be parsed in this state:
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+-----+-----+----------+--------+
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| VER | CMD | DST.PORT | DST.IP |
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+-----+-----+----------+--------+
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*/
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pkt, ok := s.reqBuf.Get(8, true)
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if !ok {
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return utils.LSMActionPause
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}
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if pkt[0] != Socks4Version {
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return utils.LSMActionCancel
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}
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if pkt[1] != Socks4CmdTCPConnect && pkt[1] != Socks4CmdTCPBind {
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return utils.LSMActionCancel
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}
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|
||||
dstPort := uint16(pkt[2])<<8 | uint16(pkt[3])
|
||||
dstIp := net.IPv4(pkt[4], pkt[5], pkt[6], pkt[7]).String()
|
||||
|
||||
// Socks4a extension
|
||||
s.isSocks4a = pkt[4] == 0 && pkt[5] == 0 && pkt[6] == 0
|
||||
|
||||
s.reqMap = analyzer.PropMap{
|
||||
"cmd": pkt[1],
|
||||
"ip": dstIp,
|
||||
"port": dstPort,
|
||||
}
|
||||
s.reqUpdated = true
|
||||
return utils.LSMActionNext
|
||||
}
|
||||
|
||||
func (s *socks4Stream) parseReqUserId() utils.LSMAction {
|
||||
userIdSlice, ok := s.reqBuf.GetUntil([]byte("\x00"), true, true)
|
||||
if !ok {
|
||||
return utils.LSMActionPause
|
||||
}
|
||||
userId := string(userIdSlice[:len(userIdSlice)-1])
|
||||
s.reqMap["user_id"] = userId
|
||||
s.reqUpdated = true
|
||||
return utils.LSMActionNext
|
||||
}
|
||||
|
||||
func (s *socks4Stream) parseReqHostname() utils.LSMAction {
|
||||
// Only Socks4a support hostname
|
||||
if !s.isSocks4a {
|
||||
return utils.LSMActionNext
|
||||
}
|
||||
hostnameSlice, ok := s.reqBuf.GetUntil([]byte("\x00"), true, true)
|
||||
if !ok {
|
||||
return utils.LSMActionPause
|
||||
}
|
||||
hostname := string(hostnameSlice[:len(hostnameSlice)-1])
|
||||
s.reqMap["hostname"] = hostname
|
||||
s.reqUpdated = true
|
||||
return utils.LSMActionNext
|
||||
}
|
||||
|
||||
func (s *socks4Stream) parseRespPacket() utils.LSMAction {
|
||||
pkt, ok := s.respBuf.Get(8, true)
|
||||
if !ok {
|
||||
return utils.LSMActionPause
|
||||
}
|
||||
if pkt[0] != Socks4ReplyVN {
|
||||
return utils.LSMActionCancel
|
||||
}
|
||||
if pkt[1] != Socks4ReqGranted &&
|
||||
pkt[1] != Socks4ReqRejectOrFailed &&
|
||||
pkt[1] != Socks4ReqRejectIdentd &&
|
||||
pkt[1] != Socks4ReqRejectUser {
|
||||
return utils.LSMActionCancel
|
||||
}
|
||||
dstPort := uint16(pkt[2])<<8 | uint16(pkt[3])
|
||||
dstIp := net.IPv4(pkt[4], pkt[5], pkt[6], pkt[7]).String()
|
||||
s.respMap = analyzer.PropMap{
|
||||
"rep": pkt[1],
|
||||
"ip": dstIp,
|
||||
"port": dstPort,
|
||||
}
|
||||
s.respUpdated = true
|
||||
return utils.LSMActionNext
|
||||
}
|
||||
|
|
@ -44,6 +44,10 @@ func (lsm *LinearStateMachine) Run() (cancelled bool, done bool) {
|
|||
return false, true
|
||||
}
|
||||
|
||||
func (lsm *LinearStateMachine) AppendSteps(steps ...func() LSMAction) {
|
||||
lsm.Steps = append(lsm.Steps, steps...)
|
||||
}
|
||||
|
||||
func (lsm *LinearStateMachine) Reset() {
|
||||
lsm.index = 0
|
||||
lsm.cancelled = false
|
||||
|
|
|
|||
|
|
@ -87,8 +87,7 @@ var logFormatMap = map[string]zapcore.EncoderConfig{
|
|||
var analyzers = []analyzer.Analyzer{
|
||||
&tcp.FETAnalyzer{},
|
||||
&tcp.HTTPAnalyzer{},
|
||||
&tcp.Socks4Analyzer{},
|
||||
&tcp.Socks5Analyzer{},
|
||||
&tcp.SocksAnalyzer{},
|
||||
&tcp.SSHAnalyzer{},
|
||||
&tcp.TLSAnalyzer{},
|
||||
&tcp.TrojanAnalyzer{},
|
||||
|
|
|
|||
Loading…
Reference in New Issue