[Help-gnu-radius] Question about querying RADIUS

[Henry Hsu]

Hello! RADIUS newbie, here... beware.

I am writing a web application that supports RADIUS authentication.
Specifically, when users attempt to logon to my application, I pass the
username/password pair to a pre-determined RADIUS server -- along with my
NAS-IDENTIFIER, etc. The RADIUS server informs me whether the login attempt
should be successful.

Question: Is there any way for me to send a query to the RADIUS server,
essentially asking, "How many usernames are qualified to access my
application?" That is, how many unique username/password pairs exist such
that, if entered into my application and forwarded on to the RADIUS server,
the username/password pair would result in a successful login to my
application?

Any help you could offer would be greatly appreciated. Thank you.

Best,
Henry