[squid-users] custom DNS resolver scripts? (was: Re: Is it possible to force some dstdomain to ipv4) protocol without define an outgoing ip address ?

[Amos Jeffries]

On 10/06/21 11:42 am, Alex Rousskov wrote:
> On 6/9/21 6:16 PM, Ambrose Li wrote:
>> On Wed, Jun 09, 2021 at 12:05:40PM -0400, Alex Rousskov wrote:
>>> Not that I know of. You can implement this logic inside a custom DNS
>>> resolver script, or you can reconfigure Squid whenever your outgoing
>>> addresses change, but I understand that you are looking for a better
>>> solution.
> 
>> What are the current recommendations for custom DNS resolver scripts?
> 
> I was talking about a custom script that implements a custom DNS
> resolver. With modern libraries, it takes a few lines of code to write a
> basic one. This kind of resolver does not resolve most of the names, but
> forwards queries to another/real resolver, adapting the queries and/or
> the answers as needed.
> 
> For an oversimplified example, such a script can respond to all AAAA
> queries (with answers containing no records) while forwarding all A
> queries to a "real" resolver.
> 

Should be no need for any custom scripts or Squid config at all for this.

The Bind9 filter-aaaa* feature does it already without wasting network 
bandwidth delivering ignored response fields. Other recursive resolvers 
should all have equivalent features too.


Amos