[systemd-devel] redirect multiple local ports to corresponding remote IPs / ports?

[Patrick Schleizer]

systemd directive ListenStream and systemd-socket-proxyd is really useful.

Let's say I want to redirect...

ListenStream=80
ListenStream=81
etc.

ExecStart=/usr/lib/systemd/systemd-socket-proxyd

Is there during ExecStart some way to get the ListenStream port? I.e.

ExecStart=/usr/lib/systemd/systemd-socket-proxyd 10.152.152.10:${PORT}

I mean, if
- ListenStream=80 -> ExecStart=/usr/lib/systemd/systemd-socket-proxyd
10.152.152.10:80
- ListenStream=81 -> ExecStart=/usr/lib/systemd/systemd-socket-proxyd
10.152.152.10:81
etc.

Or can there be a wrapper that has access to the ListenStream port number?

If you are wondering what I am trying to do... I am trying to port
anon-ws-disable-stacked-tor from loads of mostly idle socat listeners to
systemd socket activation. Ideally, rather elegantly without one systemd
unit file per port redirection. [1] [2] [3] [4]

Best regards,
Patrick

[1]
https://github.com/Whonix/anon-ws-disable-stacked-tor/blob/master/etc/anon-ws-disable-stacked-tor.d/30_anon-dist.conf
[2]
https://github.com/Whonix/anon-ws-disable-stacked-tor/blob/master/lib/systemd/system/anon-ws-disable-stacked-tor.service
[3]
https://github.com/Whonix/anon-ws-disable-stacked-tor/blob/master/usr/lib/anon-ws-disable-stacked-tor/socat-unix-sockets
[4] https://github.com/Whonix/anon-ws-disable-stacked-tor