Custom DNS Filtering Plugin in BIND 9

[Ondřej Surý]

Hi Mónika,

I concur the documentation is a bit scarce, have you looked at the existing plugins? This might give you a little bit of guidance.

Additionally, we have at least one more MR with the unfinished plugin in the GitLab. It’s kind of old, but it is a different from the filter_a/filter_aaaa plugins.

We would be happy to accept any work that extends the plugins API if you need one.

For constructing the modified message, I am afraid there’s nothing like “developer’s documentation”, you are the first one who asked about the plugins API in years.

Ondrej
--
Ondřej Surý — ISC (He/Him)

My working hours and your working hours may be different. Please do not feel obligated to reply outside your normal working hours.

> On 19. 3. 2025, at 19:54, Mónika Kiss <kozmamonika95 at gmail.com> wrote:
> Properly constructing and returning a custom DNS response.
> Plugin Development Guidance:
> Are there official documentation or examples for writing custom BIND 9 plugins?
> What are the recommended hook points for intercepting and modifying DNS responses?
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