[Bug 3801] Expand TOKENS available in ProxyCommand to support port forwarding

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3801

--- Comment #2 from Darren Tucker <dtucker at dtucker.net> ---
It's a bit icky, but given you specified you're running on Linux, the
ProxyCommand can fish the parent ssh's command line out of
/proc/$PPID/cmdline and do whatever it likes with it, eg:

$ cat proxycommand 
#!/bin/sh
cmdline=$(xargs -0 </proc/$PPID/cmdline)
echo "Parent Command line: $cmdline" >&2
exec nc $1 $2

$chmod a+x proxycommand

$ ssh -o proxycommand='./proxycommand %h %p' localhost
Parent Command line: ssh -o proxycommand=./proxycommand %h %p localhost
Last login: Wed Mar 12 15:18:15 2025 from 127.0.0.1
[etc]

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