Add OpenVPN probe
This adds support for OpenVPN status probe which uses OpenVPN's
management interface (configured via 'management 127.0.0.1 1234' in
OpenVPN's config).
The output looks as follows:
...
OpenVPN
127.0.0.1:1234
status: CONNECTED
tunnel: 10.8.0.15
remote: 144.76.43.77:1194
localhost:4242
status: management interface incompatible
127.0.0.1:4444
status: management interface unavailable
...
We show tunnel's IP (if available) as well as remote (OpenVPN server
itself) address/port in addition to general connection status. If
management interface is unavailable it's reported as such. If we've
managed to establish connection with a given management interface but
are unable to obtain expected information than we report this
incompatibility as well.
Related: SYS#2655
Change-Id: I4493e19b9a09dcebd289457eacd1719f7f8cc31c
8 files changed