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1
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# Telnet - Insecure remote login - RFC 854
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2
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# Pattern attributes: good veryfast fast
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3
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# Protocol groups: remote_access obsolete ietf_internet_standard
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4
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# Wiki: http://www.protocolinfo.org/wiki/Telnet
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5
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#
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6
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# Usually runs on port 23
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7
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#
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8
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# This pattern is lightly tested.
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9
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10
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telnet
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11
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# Matches at least three IAC (Do|Will|Don't|Won't) commands in a row.
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12
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# My telnet client sends 9 when I connect, so this should be fine.
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13
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# This pattern could fail on a unchatty connection or it could be
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14
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# matched by something non-telnet spewing a lot of stuff in the fb-ff range.
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15
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^\xff[\xfb-\xfe].\xff[\xfb-\xfe].\xff[\xfb-\xfe]
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