Connecting both standard input and output to another program so that they can interac

eantoranz · 06-23-2009, 11:28 AM

Hi!

I need to use SSH to connect to a host (a router, to be exact) but then I want to develop an application that can handle the session for me (it should send commands to the router and receive the output of those commands), in other words, I need to connect the standard output of this handler program to the stdin of the SSH client and the standard output of the SSH client to the handler's standard input.

Is there a way to do this?

Thanks in advance.

choogendyk · 06-23-2009, 12:49 PM

Well, it's a slightly different approach than you might have been thinking, but you might want to take a look at Expect http://expect.nist.gov/ . You can write in it directly (it is based on tcl), you can call it from perl, you can use it with ssh connections. Check out the FAQ. The book is good (I have a copy and have used it fairly extensively).

jlinkels · 06-24-2009, 09:07 PM

Expect is good for these kind of things. However have you considered talkng to your router in snmp? Most settings and readings, if not all, in a router are available through SNMP.

jlinkels

chrism01 · 06-25-2009, 12:45 AM

Another alternative is Perl using the Net::SSH http://search.cpan.org/~ivan/Net-SSH-0.09/SSH.pm, or Net::SSH::Expect http://search.cpan.org/~bnegrao/Net-...SSH/Expect.pod or Net::SSH::Perl http://search.cpan.org/~turnstep/Net...et/SSH/Perl.pm module.

eantoranz · 06-25-2009, 07:52 AM

Well... I kept myself in the "bash" spectrum through the use of named pipes.

choogendyk · 06-25-2009, 06:30 PM

Share the details. Someone will find it useful. How did you do it? What were the steps? How did it work?

eantoranz · 06-26-2009, 07:40 AM

I know.. that's the next step. I'll blog about it (expect to get it by the weekend) and then I'll link here. Fair enough?

eantoranz · 06-28-2009, 07:03 PM

As promised, here it is:

http://maratux.blogspot.com/2009/06/...-separate.html