[Feature Suggestion] ~/.ssh/config pre-connect hook

[Marc Haber]

Hi,

in port knocking setups, it would be great to have the possibility to
execute a shell command before the ssh connection is actually
initiated. That way, one could configure ssh like

host foo
hostname foo.bar.example
user baz
pre-connect knock foo.bar.example 1234 5678

and transparently initiate the connection by saying ssh foo. ssh would
then first invoke the knock process and then initiate the actual ssh
connection.

This can currently be implemented by using something along the lines of
proxycommand sh -c 'knock <knock params>; sleep 1; exec socket %h %p'
but I find this ugly and unintuitive.

Please consider implementing the more straight-forward direct approach.

Greetings
Marc

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