nsupdate: fix 'index out of range' error when no TTL answer is given (#7219)
* nsupdate: fix 'index out of range' error when no TTL answer is given
Fix a possible `list index out of range` when no answer is returned in the `ttl_changed` method
by applying the existing workaround for NS records to all record types.
Resolves#836
* fixup! nsupdate: fix 'index out of range' error when no TTL answer is given
(cherry picked from commit 208df2c9e6)
Co-authored-by: Silke Hofstra <silkeh@users.noreply.github.com>
The SOA record for an existing zone is returned as an answer RR and not
as an authority RR. It can be returned as an authority RR for subdomains
of a zone.
$ dig -t SOA example.com
;; ANSWER SECTION:
example.com. 3530 IN SOA ns.icann.org. noc.dns.icann.org. 2022091184 7200 3600 1209600 3600
$ dig -t SOA www.example.com
;; AUTHORITY SECTION:
example.com. 3600 IN SOA ns.icann.org. noc.dns.icann.org. 2022091184 7200 3600 1209600 3600
