[Pdns-users] How can I prevent that SOA and ANY queries are passed to a backend if NAPTR was requested?

[Matthias Kruzenski]

In other words, what I want is impossible?

If so, maybe someday someone can implement it. Reason for my questions:
https://mailman.powerdns.com/pipermail/pdns-users/2020-January/026467.html

Am Mi., 15. Jan. 2020 um 21:47 Uhr schrieb Klaus Darilion <
klaus.mailinglists at pernau.at>:

> Am 15.01.2020 um 19:21 schrieb Matthias Kruzenski:
> > Hello,
> >
> > I want to use PowerDNS to answer NAPTR queries through the pipe backend.
> > This works, but PowerDNS does not pass a NAPTR request to the backend,
> > but always a SOA request and then an ANY request.
> >
> > I only want to pass what was explicitly requested to the backend and
> > nothing else because the server has to process many millions of requests
> > and any overhead is not desired.
>
> This is how PowerDNS works.
>
> 1. Find the zone which handles the request. This is done with SOA requests.
>
> Ie. a query for a.b.c.d.e NAPTR triggers a SOA query for a.b.c.d.e. IF
> SOA ist not found, it tries b.c.d.e and so on until a SOA is found. With
> the SOA the Domain-Id is found, which is used for the next query.
>
> 2. Fetch the respective ressource record. PowerDNS queries the backend
> always with ANY to get all ressource records ofr the respective label
> (and caches them in the query cache). OF course it will return to the
> client only the requested type, ie NAPTR.
>
> So, you have to return all RRs for a respective label.
>
> regards
> Klaus
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