unix shell script question

[NotoriousBIG_PJ]

Hi,

I have a shell script that connects to another server. The server then prompts for a pw. How would I go about making my script fill in this pw?

Thanks,

Biggie.

 

[rsabo]

Quote:

Originally Posted by NotoriousBIG_PJ Hi, I have a shell script that connects to another server. The server then prompts for a pw. How would I go about making my script fill in this pw? Thanks, Biggie.

What command are you using to connect to the server?

 

[NotoriousBIG_PJ]

Quote:

Originally Posted by rsabo What command are you using to connect to the server?

rlogin or telnet

Biggie.

 

[mjg]

biggie,

can you use SSH? It might make things easier.

 

[NotoriousBIG_PJ]

Quote:

Originally Posted by mjg biggie, can you use SSH? It might make things easier.

Only in certain instances.

Biggie.

 

[mjg]

if you go with SSH you can use RSA to store the keys and then not need to get prompted for a password. Thats why i suggested it if its a possiblity

 

[NotoriousBIG_PJ]

Is there any way in unix to auto answer prompts?

Biggie.

 

[Wodgy]

Just pipe (or redirect) the password to Telnet in the same way that you're sending all the other commands to Telnet. There's nothing special or different about how you handle passwords.

As usual, the standard warnings about using Telnet apply. If there's any possibility at all of the communication leaving your firewalled local network on its way to the server, Telnet should not be used because the password travels as cleartext. Even then, sysadmins at most places ban Telnet because of the risk of a rogue employee or intruder sniffing packets on the local network.

 

[psychogentoo]

Have you looked into Expect?

I think this is what you're looking for <waves hand>

 

[mbd]

As psychogentoo said, 'expect' will allow you to have a script send responses based on information received (such as a request for a password). You really should attempt to use SSH over telnet though for security reasons (telnet transmits your passwords and any other sensitive data in plain readable text which can easily be picked up by anyone along the network without much difficulty at all). Furthermore, if you're going to put a password into a shell/expect script, you should make sure that the permissions are such that they're not easily readable by others.

Using SSH with authorized_keys files setup really would be the best option if you can convince the remote side to use an sshd. See http://www.arches.uga.edu/~pkeck/ssh/ for instructions on how it can be done.

 

[SiBurning]

Quote:

Originally Posted by NotoriousBIG_PJ Is there any way in unix to auto answer prompts? Biggie.

"here documents" might do it.
http://www.faqs.org/docs/abs/HTML/here-docs.html

Usernames, passwords, or anything else can be entered on the command line when you invoke the script. Although I agree that for anything with passwords you should run over ssh or another secure/encrypted mechanism.

Although... Didn't know about expect. That looks better.

 

[mjg]

Quote:

Originally Posted by mbd Using SSH with authorized_keys files setup really would be the best option if you can convince the remote side to use an sshd. See http://www.arches.uga.edu/~pkeck/ssh/ for instructions on how it can be done.

+1 good call... that's what i was suggesting too.

 

[NotoriousBIG_PJ]

Thanks for the replys.

I have another question, is there a windows program I can install that will allow me to remap keys (ie. I press F1 key and 'telnet aaaab' is typed on the screen. I haven't been able to find something like this using google yet.

edit: Ah I figured it out, keystroke/keyboard macros is what I was looking for

Biggie.