feature: sips protocol (TCP port 5061)

[lukastribus]

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

A want to check TLS certificates of SIPS endpoints (implicit TLS on TCP port 5061).

Describe the solution you'd like

Add SIPS protocol with default TCP port 5061.

Describe alternatives you've considered

Just using a different protocol and specifying the port (see below), but it's not "nice".

Additional context

Example Host: sip.pstnhub.microsoft.com
Example Port: 5061 (this is the default port for SIPS)

Here's an example of HTTPS and FTPS checks against the example host:

$  check_ssl_cert -H sip.pstnhub.microsoft.com --port 5061
SSL_CERT OK - sip.pstnhub.microsoft.com:5061, https, x509 certificate 'sip.pstnhub.microsoft.com' from 'Microsoft Corporation' valid until Dec 25 07:23:50 2024 GMT (expires in 347 days)|days_chain_elem1=347;20;15;; days_chain_elem2=956;20;15;;
$ check_ssl_cert -H sip.pstnhub.microsoft.com --port 5061 --protocol ftps
SSL_CERT OK - sip.pstnhub.microsoft.com:5061, ftps, x509 certificate 'sip.pstnhub.microsoft.com' from 'Microsoft Corporation' valid until Dec 25 12:56:48 2024 GMT (expires in 348 days)|days_chain_elem1=348;20;15;; days_chain_elem2=956;20;15;;
$

[matteocorti]

Fixed in d05342f

[lukastribus]

Thank you!