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Date: Mon, 3 Feb 2014 11:18:07 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: openssh-6.5p1-1 don't use address in /etc/hosts
Message-ID: <20140203101807.GP2821@calimero.vinschen.de>
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On Feb  2 11:04, Ola Str=C3=B6mfors wrote:
>=20
> On Feb 1 13:54 Corinna Vinschen wrote
> >On Feb  1 09:12, Ola Stromfors wrote:
> >>Hi,
> >>
> >>After upgrading openssh from 6.4p1-1 to 6.5p1-1, ssh to host names
> >>listed in /etc/hosts fails. /etc/hosts is actually a symlink to
> >>/cygdriv/c/Windows/system32/drivers/etc/hosts.
> >
> >Not sure that's the actual reason.  getaddrinfo is a WinSock call
> >which, probably, never ignores its hosts file.
> >
> >>% ssh centaur
> >>getaddrinfo: (null): Name or service not known
> >>ssh: connect to host centaur port 22: No such file or directory
> >
> >(null) is the replacement string when printf'ing a NULL pointer as
> >string.  So it seems ssh called getaddrinfo with a NULL pointer for
> >node and service.
> >
> >Can you call `ssh -vvv centaur' and see if the debug output gives
> >some clue as to what happens?
> [...]
>    I then started to comment out different lines in my .ssh/config file.
>    The line that caused the problem was
>=20
>      UsePrivilegedPort yes
>=20
>    After removing that lines I got this
> [success]

Thanks for tracking this down.  I debugged this on the source level and
it turned out that this is the result of an old Cygwin-related patch
combined with a new generic patch in OpenSSH 6.5.

On non-Cygwin systems, an "UsePrivilegedPort yes" is ignored if the uid
of the caller is not 0 (=3D=3D root).  On Cygwin "UsePrivilegedPort yes" is
not ignored.

The new generic patch is this:

 * ssh(1): bz#1211: make BindAddress work with UsePrivilegedPort.

This leads to a call to getaddrinfo with hostname and service parameter
set to NULL, if UsePrivilegedPort is set.  The same occurs on non-Cygwin
systems if the user is root.

I'll report this as a bug upstream.


Thanks,
Corinna

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

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