[Bug 2336] Expose dynamic port for -R 0:... via environment

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2336

--- Comment #5 from Josh Triplett <josh at joshtriplett.org> ---
(In reply to Sami Hartikainen from comment #4)
> (In reply to Damien Miller from comment #3)
> > The reason we haven't done this is that it is when clients start
> > forwardings after establishing the shell/login session - these will
> > not get into the environment.
> 
> Quite right, a real application requires an additional method for
> conveying runtime changes. I've done that, but the implementation is
> very much application-specific.

Fair point, but let's not let the perfect be the enemy of the good
here.  Quite a few things don't quite work right with runtime changes
or with persistent shared SSH connections, but at least conveying the
*initial* data via an environment variable would help.

For runtime changes, I'd suggest an environment variable containing a
socket that receives notification of changes in a well-defined format. 
However, that would take quite a lot more work to implement, and the
simple environment variable still seems preferable for simple cases.

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