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From: Cameron Simpson <cs@zip.com.au>
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Subject: Re: Testing whether the VPN is running?
Date: Tue, 23 Feb 2016 19:24:45 +1100
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On 18Feb2016 10:03, Adam Funk <a24061@ducksburg.com> wrote:
>On 2016-02-18, Ervin Hegedüs wrote:
>> I think that the psutil modul could be better for you for this
>> task:
>> https://pypi.python.org/pypi/psutil/
>>
>> and see the "Network" section.
>
>if 'tun0' in psutil.net_if_addrs():
>   # vpn is running
>
>Brilliant!  I've used psutil for something else, but I didn't know it
>did that too.  My excuse is that the version on my system was 2.2.1,
>which does not do that, so I installed the newer version with pip3.
>Thanks for pointing me to that.

You might also want to check that the interface is up.

My personal hack (not for a VPN, but for "being online", which turns my ssh 
tunnels on and off) is to look in the output of "netstat -rn" for a default 
route. This may imply that an alternative test for you is to test for a route 
to your VPN's address range?  Just an idea.

Cheers,
Cameron Simpson <cs@zip.com.au>