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

[bugzilla-daemon at mindrot.org]

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

            Bug ID: 2336
           Summary: Expose dynamic port for -R 0:... via environment
           Product: Portable OpenSSH
           Version: 6.7p1
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: sshd
          Assignee: unassigned-bugs at mindrot.org
          Reporter: josh at joshtriplett.org

"ssh -R 0:example.org:port" will forward a dynamically allocated port
on the server to example.org:port from the client.  The dynamically
allocated port gets printed; however, as far as I can tell there's no
way to access it programmatically from the server.  I'd like to have it
exposed via an environment variable on the server (for instance,
SSH_FORWARDED_PORTS), which would allow programs run on the server to
know and use the dynamic port.

If the client set up multiple dynamic port forwards, the environment
variable would contain a space-separated list of port numbers, in the
same order as the requests on the ssh command line.

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