giving a different answer to external vs VPN hosts

[vielmetti]

I have a couple of machines in a Tailscale network, where there's an internal VPN address (on tailscale0) and an external address (on eth0). Some of those systems are behind home firewalls. I'd like to run finger2020 everywhere.

I'd also like to have finger2020 give different answers depending on which IP address gets the query, so that I can use finger for some details for the private VPN hosting, and provide something else if someone hits it from a public address.

I think this is more about how to configure systemd to bend it to my will, rather than this code here which is as far as I can tell perfectly suited for the task. So it's not a bug report, more a configuration question.