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Full Discussion: Expect scripting telnet stop on bad username or password
Top Forums Shell Programming and Scripting Expect scripting telnet stop on bad username or password Post 302713477 by spacebar on Wednesday 10th of October 2012 08:55:20 PM
Old 10-10-2012
This is an example to try:
Code:
#!/usr/bin/expect
set timeout 1
set host     [lindex $argv 0]
set user     [lindex $argv 1]
set password [lindex $argv 2]

proc login {user password} {
  expect -re "(Login|login).*:.*"            { exp_send "$user\r"; exp_continue } \
         -re "(Password|password).*:.*"      { exp_send "$password\r"; exp_continue } \
         -re "(#|\$|>)"                       { return 0 } \
         eof                                 { puts "***Error connecting to($host)."; return 1 }
         timeout                             { puts "***Error connecting to($host)."; return 1 }
  }
}

spawn telnet $host
set login_results [login $user $password]

# If successful connection, continue, else exit denoting error occured.
if { $connect_results == 0 } {

  # Successful telnet session so exit with zero status
  exit 0
}
# Error connecting to host so exit with non-zero status
exit 1


There is another expect telnet example here:
Expect - Wikipedia, the free encyclopedia
Expect scripts for automatic login with telnet and SSH Sasha's weblog
 

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LEARN ABOUT OSX

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 v5.16.2							    2010-02-23					    Regexp::Common::URI::telnet(3)
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