ssl_cert: Allow forcing IPv4 or IPv6 check

[z3ntu]

Is your feature request related to a problem? Please describe.

check_ssl_cert supports passing -4 and -6 to force IPv4 or IPv6 respectively. There is no Icinga option to pass this through.

Describe the solution you'd like

Add an option for Icinga to pass through these arguments.

Describe alternatives you've considered

?

Additional context

Something like #9978

[Al2Klimov]

Hello Luca!

Have you tried setting e.g. vars.check_ipv4?

Best, A/K

[z3ntu]

No, is there any documentation what this does or how to use it? I can't seem to see any reference in the docs?

[Al2Klimov]

Indeed, docs are missing. But according to command-plugins.conf it's a boolean.

[Al2Klimov]

My suggestion seems not to be _the way_TM. A code grep for check_ipv[46] shows that lots of commands do this:

itl/command-plugins.conf:2142:	vars.check_ipv6 = "$dig_ipv6$"

They provide own switches on top of vars.check_ipv[46] in the first place and document them. So, strictly speaking: yes, the command lacks an own (documented) option.