[dns-operations] Minimalistic DNS server for SOA and AXFR

[Simon Munton]

If you are going to support NOTIFY then you will also need to catch the 
NOTIFY/ACK - but otherwise ignore responses.

Presumably EDNS0 is handled in the library?

Some DNS server will probe with an IXFR to see if it is supported (over 
TCP or UDP), but this behaviour can usually be switched off 
(always_use_axfr=true type thing).


On 16/07/2012 15:49, Anand Buddhdev wrote:
> Hello DNS gurus,
>
> I'm writing a minimalistic DNS server (in python, using the dnspython
> module), whose purpose will simply be to provide AXFR for a fixed set of
> zones. The clients will be BIND and/or NSD. It will send NOTIFY messages
> to the clients, and provide (some) responses.
>
> As far as I can see, my small DNS server needs to do the following:
>
> 1. Listen on UDP/53, and:
>
> 1a. return REFUSED responses for any zones I haven't loaded;
>
> 1b. return NOTIMP responses to queries other than SOA; and
>
> 1c. return a NOERROR response for zones I have, with the SOA record in
> the answer section, setting the AA bit. Do I need to fill the authority
> section too?
>
> 2. Listen on TCP/53, and:
>
> 2a. return REFUSED responses for any zones I haven't loaded; and
>
> 2b. return NOTIMP responses to queries other than AXFR; and
>
> 2c. return the zone in response to AXFR.
>
> Have I missed anything obvious?
>
> Regards,
>
> Anand
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