Re: Question for wireguard events

[Barry Scott <barry@barrys-emacs.org>]

> On 16 Mar 2020, at 12:43, Simon Lindhorst <s.lindhorst@wut.de> wrote:
> 
> Hi,
> 
> is there a way to get events for wireguard?
> 
> I want to show in an gui which clients are connected or not. For that I could poll the wireguard netlink socket. The better way in my opinion is to wait for events, so no polling is required.

I don't know if there are events that you can hook, others understand this better then I do.

What I did is:

	wg show all dump

I extract the latest_handshake field out of the dump for each client.
I know the client_keepalive from my client database.

Then I do this calculation based on information from people on #wireguard IRC:

        ago = now - latest_handshake
        # handshake is every 2 minutes + keep alive + 2 (error margin)
        down_after = (60*2) + client_keepalive + 2

        if latest_handshake == 0 or ago > down_after:
            state = 'Down'
        else:
            state = 'Up (%d%%)' % (100-(ago*100//down_after),)

I only have a handful of clients so this is fast for me. I show the results
in a web page that shows the status of my firewall.

If I was going to scale this to large size I'm use the netlink interface
so that I only fetched the perr info I needed.

Barry


> 
> 
> Best regards,
> 
> Simon
> 
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