Time for action – setting default values for variables

We are not always sure if a variable exists. Unlang features syntax for us to specify a default value in case a variable does not exist. Again we will demonstrate this by modifying the previous exercise. We will use radtest to first include Framed-Protocol = PPP in the request and also to leave it out. If the Framed-Protocol AVP is not present, we will return a default string.

1. Edit the sites-available/default virtual server under the FreeRADIUS configuration directory and add the following code inside the post-auth section, at the top of the section:

   if(control:Auth-Type == 'PAP'){ 
       update reply { 
           Reply-Message := "Framed protocol is: %{%{request:Framed-Protocol}:-Not in request}"
       } 
   } 

2. Restart FreeRADIUS in debug mode and try to authenticate as alice. First add a 1 to the end of the radtest command, then omit the 1.
3. The value of Reply-Message with 1 added to radtest should be:

   Reply-Message =...