parse a zone as-is #877

from miekg/dnsv1: Also miekg/dns does not have an option to leave $-directives as-is.

maybe that would be nice to add

It would also be nice to add an error tolerant parser where it doesn't fail on a single broken record ?
Right now we are forced to parse RR by RR for single record broken zones

might make sense too, yes

how do you end up with broken records in a zone?

I can think of multiple cases - if your policy as a DNS provider is not to break zones on a single broken record you have to accept the zone without the broken record
A) Most common case would be an upstream bind master with "check-names master ignore;check-names slave ignore;"
Bind is chugging along happily masking operator mistakes because purposefully a lot of people run those options to not completely trash their zones if there are issues
You have no control of whats served upstream via AXFR/IXFR to anything thats running miekg/dns v2 , bind sends the zone with even a single broken record operators upstream can have a single broken record and then you have to fall back to per record RR parsing killing performance of whole zone parsing
B) multiple versions of bind dont validate IXFR they just relay it you can get anything on IXFR
C) You dont have proper verification yourself for a specific record type and you allow anything to be typed into it - parser fails due to this

Ack. Skipping errors should really easy actually. Though it depends a bit on how borked that parser state is