A simple pre-paid example

Goal: To implement a simple "prepaid" functionality in the server.

Time: 15-25 minutes

Files:

Many system administrators wish to implement "prepaid" billing for their systems. In this exercise, we will configure the server to use a simple "prepaid" scheme, wherein all users will be permitted to log in for only one hour a day.

Read etc/raddb/mods-available/counter and look for the counter daily instance The documentation for the module consists solely of the comments in etc/raddb/mods-available/counter, so those comments should be read carefully. Search the rest of the configuration file for references to the daily module and un-comment any references you find.

Add an entry that sets the Max-Daily-Session to have the value 3600 to the top of the file. Start the server, and test it with the bob.sh script. Note that unlike previous responses from the server, this one contains a Session-Timeout attribute with value 3600.

Wait five to ten seconds, and then use the bob-acct-stop.sh script to tell the server that user "bob" has logged off. Observe that the counter module is called and that this module updates the user’s login time. Now send the server another login request (bob.sh), and observe that the "Session-Timeout" attribute has a value less than 3600. The value should be near 3600. This value depends on the length of time passed between when the server is started and when the bob-acct-stop.sh script is run.