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From:	Ismail Donmez <ismail AT i10z DOT com>
Date:	Tue, 20 Dec 2016 23:46:13 +0100
Message-ID:	<CAFo71_6_9qrgn8L5Zg=m+_3pUz53SB321XPnAUuqJ=Ss+12-yg@mail.gmail.com>
Subject:	Re: [ANNOUNCEMENT] Updated: OpenSSH-7.4p1-1
To:	cygwin AT cygwin DOT com
X-IsSubscribed:	yes

Hi,

On Tue, Dec 20, 2016 at 9:44 PM, Corinna Vinschen
<corinna-cygwin AT cygwin DOT com> wrote:
> I've just updated the Cygwin version of OpenSSH to 7.4p1-1.
>
> This is primarily an upstream bugfix release.
>
> Below's the original release message.
[...]
>  * ssh(1): Add a proxy multiplexing mode to ssh(1) inspired by the
>    version in PuTTY by Simon Tatham. This allows a multiplexing
>    client to communicate with the master process using a subset of
>    the SSH packet and channels protocol over a Unix-domain socket,
>    with the main process acting as a proxy that translates channel
>    IDs, etc.  This allows multiplexing mode to run on systems that
>    lack file- descriptor passing (used by current multiplexing
>    code) and potentially, in conjunction with Unix-domain socket
>    forwarding, with the client and multiplexing master process on
>    different machines. Multiplexing proxy mode may be invoked using
>    "ssh -O proxy ..."

Looks like this could be used for connection multiplexing on Cygwin.
Since it doesn't seem to be documented I am not sure how one can test
it, but ...

with


Host *
ControlMaster auto
ControlPath ~/.ssh/master-%r@%h:%p

latte ~ > ssh i10z.com
mux_client_request_session: read from master failed: Connection reset by peer
Failed to connect to new control master

--> Fails as expected, lets retry.

latte ~ > ssh i10z.com
mux_client_request_session: read from master failed: Connection reset by peer
ControlSocket /home/ismail/.ssh/master-ismail AT i10z DOT com:22 already
exists, disabling multiplexing
Welcome to Ubuntu 16.10 (GNU/Linux 4.8.0-30-generic x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage
Last login: Tue Dec 20 23:42:56 2016 from 2a02:810d:8ac0:a3c:de8:1380:f2c2:bc79

--> Started a new session and created the master too.

latte ~ > ssh -O proxy i10z.com
Welcome to Ubuntu 16.10 (GNU/Linux 4.8.0-30-generic x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage
Last login: Tue Dec 20 23:43:02 2016 from 2a02:810d:8ac0:a3c:de8:1380:f2c2:bc79

--> Started a new session.

latte ~ > ssh -O proxy i10z.com
Last login: Tue Dec 20 23:43:06 2016 from 2a02:810d:8ac0:a3c:de8:1380:f2c2:bc79

--> Voila, it used the existing connection!

And after that it indeed seems to be using the old connection as long
as you specify -O proxy option.

Something to play with I guess.

Regards,
ismail

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