71 lines
1.2 KiB
Go
71 lines
1.2 KiB
Go
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package telnet
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import (
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"git.loafle.net/overflow/overflow_discovery/service/matcher"
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)
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const (
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DO = 0xfd
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WONT = 0x4b
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WILL = 0xfb
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DONT = 0xfe
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CMD = 0xff
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)
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type TelnetMatcher struct {
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matcher.Matchers
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}
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func (tel *TelnetMatcher) ServiceName() string {
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return "Telnet"
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}
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func (tel *TelnetMatcher) IsPrePacket() bool {
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return true
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}
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func (tel *TelnetMatcher) HasResponse(index int) bool {
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return true
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}
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func (tel *TelnetMatcher) IsError(info matcher.MatchInfo, index int, packet *matcher.Packet) bool {
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return false
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}
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func (tel *TelnetMatcher) Match(info matcher.MatchInfo, index int, packet *matcher.Packet) bool {
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result := false
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if packet == nil || packet.Buffer == nil || packet.Len == 0 {
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return result
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}
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buf := make([]byte, 0, 0)
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count := 0
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for i := 0; i < len(packet.Buffer); i++ {
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if packet.Buffer[i] > 0 {
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buf = append(buf, packet.Buffer[i])
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} else if count > 2 {
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break
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} else {
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count++
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}
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}
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for idx := 0; idx < len(buf); idx += 3 {
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if buf[idx] == CMD && (buf[idx+1] == DO || buf[idx+1] == WONT || buf[idx+1] == WILL || buf[idx+1] == DONT) {
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result = true
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} else {
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result = false
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}
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}
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return result
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}
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func NewMatcher() matcher.Matcher {
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m := &TelnetMatcher{}
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return m
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}
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