openssh unix dev - Sep 2021 - Keeping or stopping TCP forwardings when the foreground process quits?

Hi,

In my ~/.ssh/config I've got a few hosts with

	ControlMaster auto

(for performance reasons, they're higher latency and
cutting down reconnect time helps a lot).


Now I started a TCP delay via the usual

	ssh user at host -L port:IP:port

and when I no longer needed it, I quit the interactive shell.


But the TCP forwards still worked - of course,
as the ControlMaster process was still active!


What I'd like to ask/discuss is -- perhaps the TCP forwarding should
(optionally, by default) be bound to the interactive SSH process -
and when that one quits, the forwarding is stopped?

(When running with -f, SSH runs in the background anyway.)


Or is that a bad idea?

Hi,

Philipp Marek wrote:
> But the TCP forwards still worked - of course,
> as the ControlMaster process was still active!
> 
> What I'd like to ask/discuss is -- perhaps the TCP forwarding should
> (optionally, by default) be bound to the interactive SSH process -
> and when that one quits, the forwarding is stopped?
I'd also like such behavior, but I don't know if the session owner
(the Master process) can reliably tell when a Slave process exits?

A first step might be to enable Slave processes to not only add but
also remove previously established channels?


//Peter