[ldns-users] Ldns responses

Wouter Wijngaards wouter at nlnetlabs.nl
Fri Sep 21 07:54:24 UTC 2018

Hi Harish,

Not really.  In ldns there are functions to find information, like
ldns_dnssec_zone_find_rrset that finds by name and rrset type in the
information and that could be useful (depending on what you need).

But unbound has libunbound, and it can return responses to a function
call, and recent unbound versions have the auth-zone functionality. 
This can be used to create a libunbound instance that returns authority
zone responses for a query from zone file contents.  Right now that
needs the libunbound call to read a unbound.conf file, that contains an
auth-zone directive, with a zonefile pointed at where you want it.  And
with for-downstream: yes specified; that makes it return authority
responses to the libunbound calls, without that it would return
recursive responses.

If you then want to put that DNS response on the wire, and not do
something else with it, then there are authority DNS servers that do the
whole thing (a bit obvious, but I thought I would mention it), like NSD
and unbound with auth-zone configured.

If the something else you want to do just means change a couple of
names, then unbound's local-data is in front of the auth-zone, and would
be processed first.  It can do some things, eg. return that data instead.

Best regards, Wouter

On 20/09/18 18:58, Harish Holenarsipura Viswanatha wrote:
> Hi, 
> Is there away to generate DNS response  for a particular query from
> the zone file contents. 
> Thanks
> Harish 
> _______________________________________________
> ldns-users mailing list
> ldns-users at nlnetlabs.nl
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