Programmatic responses with unbound

Unbound
1

Hi list,

I’m looking to implement with Unbound something similar to OpenDNS’s debug.opendns.com TXT record.

It’s a programmatic response to a query that responds with debug meta data, e.g.:
;; QUESTION SECTION:
;debug.opendns.com. IN TXT

;; ANSWER SECTION:
debug.opendns.com. 0 IN TXT “server 5.fra”
debug.opendns.com. 0 IN TXT “flags 20 0 2cc d00d82040001401”
debug.opendns.com. 0 IN TXT “id 381599”
debug.opendns.com. 0 IN TXT “source 217.254.45.71:14830”
debug.opendns.com. 0 IN TXT “dnscrypt enabled (7136666E76576A42)”

Has anyone done something like this? Is it possible to do with libunbound?

Best regards,

Maciej Soltysiak

2

I'm looking to implement with Unbound something similar to OpenDNS's
debug.opendns.com TXT record.

It's a programmatic response to a query that responds with debug meta data,

Most existing DNS implementations use records in the CHAOS class for
this.

With Unbound, take a look at daemon/worker.c and the `answer_chaos()`
function.

% dig +noall +answer -c chaos -t txt id.server
id.server. 0 CH TXT "barbican.spodhuis.org"
% dig +noall +answer -c chaos -t txt version.server
version.server. 0 CH TXT "unbound 1.5.3"

Has anyone done something like this? Is it possible to do with libunbound?

(here I have to defer to others, sorry)

3

I'm looking to implement with Unbound something similar to OpenDNS's
debug.opendns.com TXT record.

It's a programmatic response to a query that responds with debug meta data,

Sigh.

Most existing DNS implementations use records in the CHAOS class for this.

There's even an RFC: https://tools.ietf.org/html/rfc4892

Regards,
-drc