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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 PHP

crack_check

CRACK_CHECK(3)								 1							    CRACK_CHECK(3)

crack_check - Performs an obscure check with the given password

SYNOPSIS

       bool crack_check (resource  $dictionary, string	$password)

DESCRIPTION

       bool crack_check NULL (string  $password, string  $username = "", string  $gecos = "", resource	$dictionary)

	Performs an obscure check with the given password on the specified dictionary. The alternative signature also takes into account the user-
       name and the GECOS information.

       Warning

	      This function is EXPERIMENTAL. The behaviour of this function, its name, and surrounding documentation may change without notice	in
	      a future release of PHP. This function should be used at your own risk.

PARAMETERS

	      o $dictionary
		- The crack lib dictionary. If not specified, the last opened dictionary is used.

	      o $password
		- The password to be checked.

	      o $username
		- The username of the account with the password.

	      o $gecos
		- The GECOS information associated with the user account.

RETURN VALUES

	Returns TRUE if $password is strong, or FALSE otherwise.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       |  0.3	|						    |
       |	|						    |
       |	|  The $username, $gecos and $dictionary parameters |
       |	| were added to the alternative signature.	    |
       |	|						    |
       +--------+---------------------------------------------------+
PHP Documentation Group 													    CRACK_CHECK(3)
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