Hi,
On Sun, Dec 20, 2020 at 5:55 AM Gert Doering <[email protected]> wrote:
> Hi,
>
> I find myself looking for a mechanism by which I could send informational
> messages ("your cert expires in two weeks, go refresh!" - "your openvpn
> client needs an upgrade") from the openvpn server to incoming clients.
>
> Of course this should work with all connecting clients, that is, "text
> clients", windows GUI, Tunnelblick, iOS Connect, Android.
>
> As far as I am aware, there is no such mechanism today.
>
We once had extensive discussions on using echo for this. As echo
commands are up to the UI to interpret, adding new one's does
not require any changes in the core.
I had posted a draft implementation for OpenVPN-GUI (not sure it still
works, though) along with some details of the message syntax:
https://github.com/selvanair/openvpn-gui/releases/tag/v11-echo-msg
IIRC, Jonathan had written up documentation for the proposed syntax.
I don't have links to the relevant mails at hand, but should be in the
archives.
It may be best to resurrect that effort.
Selva
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