10-21-2010
Many tcp listeners can be made to respond using telnet. I am not talking about logging in, telnet is just a trivial, general tcp client with some optional behaviors. Telnet to a web server port 80 and type 'GET / HTTP/1.0'+CR+CR. If you telnet to most servers, and they do not respond, still you know they are really listening, even if you do not know the magic bytes to make them talk. For instance, if inetd is the real listener, and the app is missing/crashing, the connection may take for an instant and they be broken off.
Make a file of good netstat -an listen lines and comm them to see if any disappeared.
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LEARN ABOUT MOJAVE
regexp::common::uri::telnet
Regexp::Common::URI::telnet(3) User Contributed Perl Documentation Regexp::Common::URI::telnet(3)
NAME
Regexp::Common::URI::telnet -- Returns a pattern for telnet URIs.
SYNOPSIS
use Regexp::Common qw /URI/;
while (<>) {
/$RE{URI}{telnet}/ and print "Contains a telnet URI.
";
}
DESCRIPTION
$RE{URI}{telnet}
Returns a pattern that matches telnet URIs, as defined by RFC 1738. Telnet URIs have the form:
"telnet:" "//" [ user [ ":" password ] "@" ] host [ ":" port ] [ "/" ]
Under "{-keep}", the following are returned:
$1 The complete URI.
$2 The scheme.
$3 The username:password combo, or just the username if there is no password.
$4 The username, if given.
$5 The password, if given.
$6 The host:port combo, or just the host if there's no port.
$7 The host.
$8 The port, if given.
$9 The trailing slash, if any.
REFERENCES
[RFC 1738]
Berners-Lee, Tim, Masinter, L., McCahill, M.: Uniform Resource Locators (URL). December 1994.
SEE ALSO
Regexp::Common::URI for other supported URIs.
AUTHOR
Damian Conway (damian@conway.org)
MAINTAINANCE
This package is maintained by Abigail (regexp-common@abigail.be).
BUGS AND IRRITATIONS
Bound to be plenty.
LICENSE and COPYRIGHT
This software is Copyright (c) 2001 - 2009, Damian Conway and Abigail.
This module is free software, and maybe used under any of the following licenses:
1) The Perl Artistic License. See the file COPYRIGHT.AL.
2) The Perl Artistic License 2.0. See the file COPYRIGHT.AL2.
3) The BSD Licence. See the file COPYRIGHT.BSD.
4) The MIT Licence. See the file COPYRIGHT.MIT.
perl v5.18.2 2013-03-08 Regexp::Common::URI::telnet(3)