Issues with DNS rewrites (CNAME rewrite pointing to A rewrite)

[mlincett]

Hi all. I have a situation in which I want to define a custom private A record and have a custom CNAME pointing to it.

For example:

• foo.example.com => 10.0.0.1
• bar.example.com => foo.example.com

In PiHole this seems straightforward to achieve.

In AdguardHome if I set it up using the "DNS rewrites" interface, querying A for bar.example.com returns the CNAME, but querying AAAA returns NXDOMAIN which will cause issues on the client side;

If I set it up using the "Custom filtering rules", such as:

||foo.example.com^$dnsrewrite=NOERROR;A;10.0.0.1
||bar.example.com^$dnsrewrite=NOERROR;CNAME;foo.example.com 

I get NXDOMAIN when querying for bar.example.com regardless of the query being A or AAAA.

Issues #4485 and #6201 may be relevant. The "DNS rewrites" behaviour seems like a bug to me, but if that interface is bound to be deprecated I will not bother filing an issues. Any feedback is welcome.