Deny dirrect access to a controller...

[eluser]rvent[/eluser]
Hello,

I was wondering how can i deny direct access to a controller so users cant just do:
http://domain.com/control_pannel/

I have written a library that uses LDAP to authenticate to Active directory and want to be able to redirect an authenticated user to a different controller, but i dont want them to be able to type the full address in the address bar and gain access...

Any ideas...?

some CI file have:
if ( ! defined('BASEPATH')) exit('No direct script access allowed');

But i dont think that's what i am looking for...

Thanks..