wildcards and pipe backend

[Fagyal Csongor]

Hi,

I am in the middle of migrating from BIND to PowerDNS using pipebackend,
and I have run into some trouble.

----
First, wildcard records.

Say, I have the following records:

foo.example.com   IN   CNAME   1.2.3.4
*.example.com   IN CNAME   1.1.1.1

Obviously
dig foo.example.com should return 1.2.3.4
but
dig bar.example.com should return 1.1.1.1

The question is: if I know I have wildcard records, then I have to do a
wildcard query? Currently what I do is to first query non-wildcard
records, and if none is found, then I do a wildcard match. Is that
correct? Do the backend have to know about wilcrads at all?

----
Second: AXFR.

I often get AXFR queries from pdns, which look like "AXFR 1".
What zone should I return in this case?

What I do now is to store the last domain queried, and when an AXFR is
received, I send out the zone according to that last domain. Is this
correct?


Thanks,
- Csongor

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[bert hubert-2]

On Wed, Sep 23, 2009 at 10:17 PM, Fagyal Csongor
<concept@...> wrote:
> The question is: if I know I have wildcard records, then I have to do a
> wildcard query? Currently what I do is to first query non-wildcard records,
> and if none is found, then I do a wildcard match. Is that correct? Do the
> backend have to know about wilcrads at

Backends should not do any thinking about wildcards, and only answer
with a wildcard if queried for one explicitly.

> I often get AXFR queries from pdns, which look like "AXFR 1".
> What zone should I return in this case?
>
> What I do now is to store the last domain queried, and when an AXFR is
> received, I send out the zone according to that last domain. Is this
> correct?

You should be setting the 'zone ID' field in the answers your PIPE
backend provides. The AXFR query you'll get is for that zone ID
number. So make sure you have a unique number per zone.

Good luck!
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[Fagyal Csongor]

Hi,

> On Wed, Sep 23, 2009 at 10:17 PM, Fagyal Csongor
> <concept@...> wrote:
>  
>> The question is: if I know I have wildcard records, then I have to do a
>> wildcard query? Currently what I do is to first query non-wildcard records,
>> and if none is found, then I do a wildcard match. Is that correct? Do the
>> backend have to know about wilcrads at
>>    
> Backends should not do any thinking about wildcards, and only answer
> with a wildcard if queried for one explicitly.
>  

Ooops, my bad. I had to set up "wildcard=yes" in the config.

>> I often get AXFR queries from pdns, which look like "AXFR 1".
>> What zone should I return in this case?
>>
>> What I do now is to store the last domain queried, and when an AXFR is
>> received, I send out the zone according to that last domain. Is this
>> correct?
>>    
>
> You should be setting the 'zone ID' field in the answers your PIPE
> backend provides. The AXFR query you'll get is for that zone ID
> number. So make sure you have a unique number per zone.
>  

Thanks, it makes sense. Looks like everything works :) I should go and
blog my experiences now :D


BTW, just for the record: my original example was wrong - A records, not
CNAME records, as I used IP-s there.

- Fagzal
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