[rbldnsd] Using external application for data?

[Joseph B. Kowalski]

Hello,


I'm very new to rbldnsd and dnsbl in general, so please excuse me 
if this is an ignorant question, but I was unable to find an answer 
anywhere I looked:


Is it possible, for A lookup requests coming into rbldnsd, for the 
program to forward the request to a program or script on the local 
machine, and then return a positive or negative response based on 
the output of the program or script (such as it returning a '0' or 
'1', for instance)? Basically, just acting as the DNS front end for 
A requests, and not actually using it's own data files for the 
request? If rbldnsd cannot do this, does anyone know of a server 
than can?


I realize this must sound really strange, but an honest answer is 
requested, please.


Thank you.


Joe Kowalski