Help writing a slapd plugin

Hi,

Inspired by the proprietary server at ldap.dnssek.info, I'd like to make a slapd plugin that, when queried for a particular email address, finds the OpenPGP keys and S/MIME certificates by doing DNS lookups (possibly aided by DANE), and then serves them back to the requestor.

Currently the documentation in the OpenLDAP Administrator's Guide still needs to be written. Since not a lot of software supports DANE right now, but a lot of programs *do* support LDAP, I think a bridge between the two is something that could really benefit the Internet community. Could someone steer me in the right direction on how to get started?

Thanks