Significant memory usage

[Carlos Horowicz]

Ondřej,

I usually include *qname-wait-recurse no* after the *response-policy { 
... } *block, hoping to avoid issues where SERVFAILs, lame delegations, 
or firewalled authoritative servers might interfere with RPZ responses. 
I’m not entirely sure if I’m just being a bit /superstitious/ about that 
— but I wanted to mention it in the context of the setup you described, 
which uses A and AAAA RRs (rather than CNAMEs or RPZ-SUFFIX rules). 
Perhaps qname-wait-recurse has a different impact in this case.

I’ve always found it puzzling when a SERVFAIL appears in the logs just 
/before/ a “CNAME .” redirection is applied, which makes me wonder if 
using A/AAAA redirection to 127.0.0.1 is ultimately more robust.

Apologies if this adds noise to the thread — feel free to disregard if 
not relevant.

Best regards,

Carlos Horowicz

Planisys

On 01/07/2025 21:00, Ondřej Surý wrote:
> You'll have to experiment a bit (and I mean read the documentation[1]) as I am writing this from top of my head,
>
> 1. You need to create RPZ zone like this:
>
> $TTL 604800
> $ORIGIN adaway.rpz.
> @ IN SOA localhost. root.localhost. (1 604800 86400 2419200 604800 )
> @ IN NS localhost.
> ad-assets.futurecdn.net A 127.0.0.1
> ad-assets.futurecdn.net AAAA ::1
> [...]
>
> I've used this command:
>
> ( echo "@ IN SOA localhost. root.localhost. (1 604800 86400 2419200 604800 )"; echo "@ IN NS localhost." ; cat named_adaway.conf  | cut -f 2 -d ' ' | while read D; do echo "$D IN A 127.0.0.1"; echo "$D IN AAAA ::1"; echo "*.$D IN A 127.0.0.1"; echo "*.$D IN AAAA ::1"; done ) > adaway.rpz.db
>
> 2. Add the RPZ zone to your named.conf
>
> zone adaway.rpz {
> type primary;
> file "/<PATH_TO>/adaway.rpz.db";
> allow-query { localhost; };
> };
>
> 3. Add the response-policy to your options {} in named.conf
>
> options {
> [...]
> response-policy { zone adaway.rpz; } break-dnssec yes;
> [...]
> };
>
> And the memory usage on 9.20 is now mere 450MB:
>    PID User     Command                         Swap      USS      PSS      RSS
> 514700 ondrej   /home/ondrej/Projects/bind9        0   451684   452652   461872
>
> $ dig +short -p 12345 @::1 ad-assets.futurecdn.net.
> 127.0.0.1
> $ dig +short -p 12345 @::1 foo.ad-assets.futurecdn.net.
> 127.0.0.1
>
> 1.https://bind9.readthedocs.io/en/v9.20.10/reference.html#response-policy-zone-rpz-rewriting
> --
> Ondřej Surý (He/Him)
> ondrej at isc.org
>
> My working hours and your working hours may be different. Please do not feel obligated to reply outside your normal working hours.
>
>> On 1. 7. 2025, at 20:40, OwN-3m-All<own3mall at gmail.com> wrote:
>>
>> Also, 127.0.0.1 (localhost) needs to be returned for these hosts, not a NXDOMAIN response.  Would that impact it?
>> -- 
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