[bind10-dev] CNAME, DNAME and authority section

[Mark Andrews]

In message <20110205083800.GA10642 at tarantula>, Michal 'vorner' Vaner writes:
> Hello
> 
> I'm facing a slight problem about behaviour. If the auth server puts a CNAM=
> E or
> DNAME into the answer, the specs are somehow silent regarding what should b=
> e put
> into the authority section (if anything).

Go re-read RFC 1034.  It isn't silent.

 
> The memory data source does not do chaining. But in theory, these
> implementations probably make sense:
>  =E2=80=A2 Put there the authority section of the original CNAME. It means =
> we have some
>    authority data no matter what happens and if the client wanted to get all
>    authoritative data on the path, it could.
>  =E2=80=A2 Put there the authority section of the final target. It is the d=
> ata the
>    client is interested (the target). If we don't have it (eg. it leads out=
>  of
>    our zones), don't put anything.
>  =E2=80=A2 The authority section of the furthest data in the chain (eg. lik=
> e previous,
>    but if it leads out of our zones, we put the last one, so we don't have =
> empty
>    authority section).
>  =E2=80=A2 Everything.
> 
> It would make sense either the first or the last IMO, but most implementati=
> ons
> AFAIK do the second (including bind 9 and SQL data source).
> 
> Restricted to the memory data source, which doesn't do chaining yet, should=
>  I
> put the authority section there or not? What do you think?
> 
> Thanks
> 
> --=20
> Let me show you my collection of bugs.
> 
> Michal 'vorner' Vaner
> 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org