execute hook on client connection?

[onehalf3544]

Hi!

I'm setting up a configuration described in
https://docs.openconnect-vpn.net/recipes/ocserv-site-to-site/ (so
Site2 <-> Site1 <-> Client(s))
except that the Site2 acts as a gateway for the clients for quite a
lot of IP ranges, and the Site1 isn't to be affected by this -
so there are source-based routing table entries for client IPs
pointing to Site2 (if/when it is connected, as those get deleted
automatically if the Site2 connection drops ;(( )

An iroute isn't enough for this (at least I don't see the way to use it).
Redefining route-add-cmd to a custom script that would check the IP
and do the custom config for Site2 only seems to be an option (or is
it possible to have route-add-cmd in the config-per-user file?),
but basically a simple hook would be a way more elegant solution.

Such functionality isn't present at the moment, am I right? Would a
patch with an implementation be welcome? Or perhaps there is a
solution that I overlooked?
(at the moment the configuration is done manually, I'd probably do
some basic automation via the cron job that would poll the connection
state constantly, but that is ugly)
Any ideas/comments/recommendations?

Thanks.