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From: Adam Dinwoodie <adam AT dinwoodie DOT org>
Date: Sat, 8 Oct 2022 14:19:41 +0100
Message-ID: <CA+kUOamq5aidTFqeA2N=y72486_JZZdfmPaUytQcKR25UK80FA@mail.gmail.com>
Subject: Re: Feature request: File descriptor support by sockets.
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On Thu, 6 Oct 2022 at 18:37, Darren Whobrey wrote:
>
> Hi, I'm using the latest version of Cygwin (3.3.6) and the Cygwin OpenSSH (OpenSSH_9.0p1, OpenSSL 1.1.1q  5 Jul 2022) version of ssh to talk to hosts using ControlMaster connection sharing. This uses sockets behind the scenes. When ControlMaster is set to no, the connection is successful.
>
> Ssh connections are failing at the point where IO starts to be forwarded to the host.
>
> Here's a snippet of log output from "ssh -vvv some-host":
>
> <snip>
>
> When successful connections are made from an OL7 client (with older version of OpenSSH, but mux commands are similar), comparative logs are:
>
> <snip>
>
> According to this web posting, it suggests the bug lies with "file descriptors over unix sockets do not work in Cygwin":
> https://exchangetuts.com/is-ssh-controlmaster-with-cygwin-on-windows-actually-possible-1639696447917488
>
> Is this something that can be fixed?

I'm very confident it *can* be fixed! But this gap has existed since
at least 2009 (see
https://cygwin.com/pipermail/cygwin/2012-February/199995.html and
https://sourceware.org/legacy-ml/cygwin/2009-10/msg00397.html) so I
suspect that, unless you're proposing to do the work or pay someone to
do it on your behalf, it's unlikely to happen any time soon.

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