Login or Register to Ask a Question and Join Our Community

Sponsored Content
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
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

username password in script

Can we write a script to telnet to a unix server from unix with the username and password hardcoded in the script?? something like ssh a@b -p password ??? (5 Replies)
Discussion started by: roshanjain2
5 Replies

2. UNIX for Dummies Questions & Answers

how to stop telnet access to AIX box

how do I remove telnet access to my AIX (5.3) machine? I just want people (admins) to connect to the box using ssh? Thanks. (2 Replies)
Discussion started by: johnbrickell
2 Replies

3. Shell Programming and Scripting

Webpage to Telnet via Perl and Expect: Telnet problem?

Somewhat long story: I have a simple Perl CGI script that uses Expect to Telnet to a device and grab some data, and then spits it back to Perl for display on the Webpage. This works for many devices I've tried, but one device just fails, it keeps rejecting the password on this device, only... (1 Reply)
Discussion started by: jondo
1 Replies

4. Shell Programming and Scripting

strange expect script behavior, or am i misunderstanding expect scripting?

Hello to all...this is my first post (so please go easy). :) I feel pretty solid at expect scripting, but I'm running into an issue that I'm not able to wrap my head around. I wrote a script that is a little advanced for logging into a remote Linux machine and changing text in a file using sed.... (2 Replies)
Discussion started by: v1k0d3n
2 Replies

5. Ubuntu

Ubuntu Server 810 Telnet ** I know its Bad.. But **

I have a real need to telnet into my new Ubuntu 8.10 server and have Googled my eyes out with ideas that don't work. I CAN telnet out of the server, but I CANNOT telnet into it (connection refused error). I have updated my resolv.conf file but its expert time. ANY IDEAS??? THANKS!!! I knew I was... (13 Replies)
Discussion started by: gbxfan
13 Replies

6. Shell Programming and Scripting

Not able to pass Username and Password in telnet session

I have created a shell script to telnet remote machine. Here is the problem I am not able to pass the login username and password to the telnet session. I have searched forum and got few other methods to achieve this. But I need to know what's wrong in the below script. username="root"... (2 Replies)
Discussion started by: uxpassion
2 Replies

7. Shell Programming and Scripting

Scripting help/advise on hiding/masking username/password

Hi, I currently have a UNIX script with a function that uses a username and password to connect to the database, retrieve some information and then exit. At the moment, am getting the username and password from a hidden plain text file and permission set to -r--------, i.e. read only to who... (1 Reply)
Discussion started by: newbie_01
1 Replies

8. Shell Programming and Scripting

Expect script - going in loops can't stop

Hi First of all I tried lot of forums to create my first expect script. But I am totally stumped at the last step. I am no Linux Admin or ever trained in Linux. I just tried to create the script logically History : I need to to change my password across lot of servers in Linux over ssh ... (4 Replies)
Discussion started by: radioactive9
4 Replies

9. Shell Programming and Scripting

Username and password

Hi I am new to using unix and am struggling with a script i am writing. What i am trying to do is get a user to enter a username, check the original file i created with username and pin to see if their is a corresponding entry. Next ask the user to enter the pin and see if this matches... (5 Replies)
Discussion started by: somersetdan
5 Replies

10. Shell Programming and Scripting

Passing username and password to a script running inside "expect" script

Hi I'm trying to run a script " abc.sh" which triggers "use.sh" . abc.sh is nothing but a "expect" script which provides username and password automatically to the use.sh script. Please find below the scripts: #abc.sh #!/usr/bin/expect -f exec /root/use.sh expect "*name*" send... (1 Reply)
Discussion started by: baddykam
1 Replies

LEARN ABOUT ULTRIX

su

su(1)							      General Commands Manual							     su(1)

Name
       su - substitute a user ID

Syntax
       su [username]

       su - [username]

       su -f [username]

Description
       The  command  requests the password of the specified username.  If the correct password is given, changes to that username without changing
       the current directory.  The user environment is unchanged except for HOME and SHELL which are taken from the password file entry for  user-
       name.   The  shell  that  is  run  is also taken from the password file entry for username.  The new user ID stays in force until the shell
       exits.

       If no username is specified, `root' is assumed.	To remind the superuser of his responsibilities, the shell substitutes `#' for	its  usual
       prompt.

Options
       -f   Prevents from executing the .cshrc file, making start up faster.

       -    Simulates a full login.

Diagnostics
       Sorry
	    An invalid password was supplied for the specified username.

       Unknown login: username
	    The specified username was not found in the passwd database.

       No directory
	    The home directory for the username is not accessible at this time (only with ``-'' argument).

       No shell
	    The shell specified in the passwd database entry for username could not be executed.

       Kerberos initialization failure
	    Consult your system administrator.

       If enhanced security features are enabled the following error messages are also possible:

       Requires secure terminal
	    Attempt to su to UID 0 on a line that is not marked secure in

       User's password has expired
	    Access is denied because the password for username is expired.

       This account is disabled
	    Access is denied because the auth entry corresponding to username is marked disabled.

Files
       Log file of anyone who became
			root, with a date mark.

See Also
       csh(1), sh(1), passwd(5yp), environ(7), edauth(8)
       Security Guide for Administrators
       Security Guide for Users

																	     su(1)
All times are GMT -4. The time now is 12:32 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy