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X-HELO:	calimero.vinschen.de
Date:	Wed, 18 Nov 2015 18:32:19 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: ssh ControlMaster re-broken
Message-ID:	<20151118173219.GS6402@calimero.vinschen.de>
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On Nov 17 12:46, Zhu, Binbin (Nokia - CN/Hangzhou) wrote:
> Hi,
>=20
> It worked month ago, but it failed after reinstall.
>=20
> 1. Create shared session: ssh -vvv -nNf -o ControlMaster=3Dyes -o Control=
Path=3D"$HOME/.ssh/ctl/%L-%r@%h:%p"  remote-host
> Output in accepting new connection:=20
> $ debug1: multiplexing control connection
> debug3: fd 5 is O_NONBLOCK
> debug3: fd 5 is O_NONBLOCK
> debug1: channel 1: new [mux-control]
> debug3: channel_post_mux_listener: new mux channel 1 fd 5
> debug3: mux_master_read_cb: channel 1: hello sent
> debug3: mux_master_read_cb: channel 1 packet type 0x00000001 len 4
> debug2: process_mux_master_hello: channel 1 slave version 4
> debug3: mux_master_read_cb: channel 1 packet type 0x10000004 len 4
> debug2: process_mux_alive_check: channel 1: alive check
> debug3: mux_master_read_cb: channel 1 packet type 0x10000002 len 41
> debug2: process_mux_new_session: channel 1: request tty 1, X 0, agent 0, =
subsys 0, term "xterm", cmd "", env 0
> mm_receive_fd: no message header
> process_mux_new_session: failed to receive fd 0 from slave
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  failed attempt at descriptor passing

> 2. Client output:
> $ ssh -vvv -o ControlPath=3D"$HOME/.ssh/ctl/%L-%r@%h:%p" remote-host
> OpenSSH_7.1p1, OpenSSL 1.0.2d 9 Jul 2015
> debug2: fd 3 setting O_NONBLOCK
> debug2: mux_client_hello_exchange: master version 4
> debug3: mux_client_forwards: request forwardings: 0 local, 0 remote
> debug3: mux_client_request_session: entering
> debug3: mux_client_request_alive: entering
> debug3: mux_client_request_alive: done pid =3D 10144
> debug3: mux_client_request_session: session request sent
> mux_client_request_session: read from master failed: Connection reset by =
peer
> debug2: ssh_connect: needpriv 0
>=20
> Could you help?

Are you really sure it ever worked?  To the best of my knowledge the
control master stuff always required descriptor passing via AF_LOCAL
sockets, which is not available under Cygwin.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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