Foreman » Smart Proxy

RFC2317 describes ways how to do Classless IN-ADDR.ARPA delegation.
It boils down to this: your provider sets a bunch of CNAMES where you would expect the PTRs usually. These CNAMES point to a different zone that is under your control.

Using the network 192.0.2.128/25 i've seen the following zone variants:
- 2.0.192.in-addr.yourdomain.tld
- 128/25.2.0.192.in-addr.arpa
- 128-25.2.0.192.in-addr.arpa
- 128-255.2.0.192.in-addr.arpa

As there is no really sane way to do this i hereby suggest the following solution:
- add a new configuration option "dns_ptr_rewritemap" that may contain a hash of { regexp => replacement } to all DNS providers where RFC2317 might occur (i.e nsupdate, nsupdate_gss, dnscmd)
- add a new function rewrite_ptr() that rewrites the ptr according the the map configured (or do nothing if no map is configured)
- make create_ptr_record() and remove_ptr_record() call rewrite_ptr() on the PTR to be created before passing it down