Hostname Lookup

Is there a way to implement a different hostname lookup method for OSX?

I have written a small P2P DNS program for the IPv6 ages. I use it to keep track of my different hosts around different places. So, I am always able to use a specific hostname like mylovelyhost.p2p whatever its IP address is at the moment.

For Linux I added a module to the NSS system (/etc/nsswitch.conf). So my module gets queried after the hosts file and before DNS and Avahi/Bonjour. If a hostname ends on .p2p, it gets active. Otherwise the query gets passed on to the next module.

Is there an API within OSX to do the same?

Kind regards,

Aiko