[Bug 2577] Port Forwarding on Proxy with ProxyCommand ssh -W does not work / bad file descriptor

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2577

Darren Tucker <dtucker at zip.com.au> changed:

           What    |Removed                     |Added
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                 CC|                            |dtucker at zip.com.au

--- Comment #2 from Darren Tucker <dtucker at zip.com.au> ---
(In reply to jan.stuehler from comment #0)
> Port Forwarding on the proxy does not work.

That's deliberate.  In ssh.c where it handles the 'W' option:

  options.request_tty = REQUEST_TTY_NO;
  no_shell_flag = 1;
  options.clear_forwardings = 1;
  options.exit_on_forward_failure = 1;

The reason for it is that we need to fail if we can't do the stdio
forward, and right now it's all or nothing so the second and subsequent
attempts to use use the jumphost will fail (and possibly the first too,
eg if the port is busy).

Right now because of the way the first-match options parsing works you
can't override the value by setting ClearAllForwardings=no either.

> Debug shows "debug1: getpeername failed: Bad file descriptor".

That's harmless.  The port forwarding message in the protocol has a
field for the source address of the forwarded connection, and when the
forwarding code tries to look up the source address of stdin it can't,
so it uses the string "UNKNOWN" instead.

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