dns/bind: allow to specify primaryip's port for secondary zone

[loopway]

Closes: #4444

Notes on proposed solution

Bind/Domain.xml:

• change field type to CSVListField, adopted from net/haproxy HAProxy.xml to allow port specification

Bind/named.conf

• adjust jinja2 template instead of introducing new fields to avoid have to deal with config migrations of previous opnsense versions
• if specifying a port for a ipv6 address the following notion has to be used: [address]:port (https://en.wikipedia.org/wiki/IPv6#Address_representation)
• using negative lookbehind in regular expression to avoid matching ipv6 addresses without port
• using multiple lookbehind regular expressions since quantifiers are not allowed and ipv6 addresses can be shortened

[fichtner]

As far as I know we have an address/port field type nowadays.

[loopway]

Found a IPPortField field type. This type would require to specify a port and would therefore invalidate address only entries from previous versions...

[fichtner]

Maybe it needs to be extended. My point is no more CSV magic regarding this.

[loopway]

I see your point, but I would argue that should be a separate issue/task, requiring changes in core. A quick github search for type="CSVListField" shows matches in three files in core and 29 files in plugins. Can we move this forward in the meantime? Changing it to an extended IPPortField later should be easy enough. What do you think?

[fichtner]

I’m only saying I’m not at the office until tomorrow to do core changes. Copy+paste is not the best idea here in 2025 😊

[loopway]

Any updates on this? By now you must have arrived in the office. 😉