RFC2136 not updating DNS when address changes

[NOYB]

When address changes everything seems to update locally as it should (wanip, cached ip, etc). But no update is sent to the DNS server. I know the DNS update works because RFC2136 Edit Save & Force Update sends the update as expected and DNS then resolves to the new address.

It appears as though mwexec_bg($cmd); on line 233 in /usr/local/etc/inc/plugins.inc.d/rfc2136.inc may be the culprit. Executing the resulting command in console shell or via the RFC2136 Edit Save & Force Update works. But if triggered by a newwanip it does not work.

How to reproduce. Get the lease to expire and obtain a new address.

Actual result: DNS record NOT updated.
Expected result: DNS record updated.

OPNsense 21.7.7 (amd64, LibreSSL)

[OPNsense-bot]

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[NOYB]

UPDATE:
rfc1236.inc:233 mwexec_bg($cmd); does not seem to work when rfc2136_configure_do() is called from plugins.inc:274 call_user_func_array($argf, array_slice($args, 0, $argc)); (newwanip triggered)

Works fine though when rfc2136_configure_do() is called from rc.rfc2136:42 (save and force update triggered)

[NOYB]

UPDATE:
/var/etc/nsupdatecmds0:

server NS1.DomainName.com
update delete ZF.DynDNS.DomainName.com. A
update add ZF.DynDNS.DomainName.com. 60 A 99.x.x.x

cmd:
/usr/local/bin/nsupdate -k /var/etc/K0DynDNS.DomainName.com.+157+00000.key /var/etc/nsupdatecmds0

exit code: 1
stderr: "couldn't get address for 'NS1.DomainName.com': not found","syntax error"

The "syntax error" doesn't seem to make sense because the command works perfectly from the command prompt.

Workarround:
Adding an unbound override for NS1.DomainName.com works around the issue.

[OPNsense-bot]

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