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Date: Fri, 23 Dec 2011 15:47:34 +1100
From: Shaddy Baddah <lithium-cygwin AT shaddybaddah DOT name>
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To: cygwin AT cygwin DOT com
Subject: Re: sftp-server -h succeeds on cmd, fails on mintty
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Hi,

On 22/12/11 13:38, Larry Hall (Cygwin) wrote:
> On 12/21/2011 9:10 PM, Shaddy Baddah wrote:
>> Hi Larry,
>>
>> On 22/12/11 12:25, Larry Hall (Cygwin) wrote:
>>> On 12/21/2011 8:17 PM, Shaddy Baddah wrote:
>>>> Hi,
>>>>
>>>> I'm experiencing a wider problem with sftp'ing to/from a Cygwin sshd
>>>> service. However as a starting point into debugging, I've identified a
>>>> simple failure in the sftp-server that may give an indication into the
>>>> wider problem.
>>>>
>>>> When I ran just a simple usage argument to sftp-server in a mintty
>>>> session, the command failed:
>>>>
>>>> sbaddah@*********** ~
>>>> $ /usr/sbin/sftp-server -h; x=$?; echo $x
>>>> 127
>>>
>>> This works fine for me from mintty.  Just a shot in the dark but can
>>> you try it with a local user?  How about a local user that's part of
>>> the local Administrators group?
>>
>> Yes, this has made a difference. Thank you. I ran against a local
>> user, although they were not a local administrator. It ran fine:
>>
>> portapps@*********** ~
>> $ /usr/sbin/sftp-server -h
>> usage: sftp-server [-ehR] [-f log_facility] [-l log_level] [-u umask]
>>
>> I guess that points towards a pseudo terminal handling glitch for a
>> domain user, right?
>
> Not definitely, no.  I just tried with my work account (which is a domain
> account) and found no problem.  Although I can't compare directly with
> the your IDs, I have root(0) and Administrators(544) on mine.  Maybe
> try adding
> these if you don't have them already.
>

The user is in the Administrators group of course. But as you only get
Administrators group for your session if you "Run as
administrator"/privilege elevate, I don't run it that way.

But it doesn't matter anyway. Either way, I encounter the same
problem. And this with the latest 1.7.10 snapshot to ensure it isn't
something that's already been fixed.

Also, there is a twist. Running under strace alters the
behaviour. Although I'm not totally surprised by this because I've
seen that strace alters tty I/O when I was debugging a problem a
couple years back
(http://sourceware.org/ml/cygwin-developers/2010-02/msg00043.html).


/Regular session/

sbaddah@*********** ~
$ id -a
uid=42037(sbaddah) gid=10513(Domain Users) groups=10513(Domain
Users),545(Users),<redacted...>

sbaddah@*********** ~
$ /usr/sbin/sftp-server -h; x=$?; echo $x
127

sbaddah@*********** ~
$ strace -o /tmp/sftp.out -f /usr/sbin/sftp-server -h
usage: sftp-server [-ehR] [-f log_facility] [-l log_level] [-u umask]

/Run as administrator session/

sbaddah@*********** ~
$ id -a
uid=42037(sbaddah) gid=10513(Domain Users) groups=10513(Domain
Users),544(Administrators),545(Users),<redacted...>

sbaddah@*********** ~
$ /usr/sbin/sftp-server -h; x=$?; echo $x
127

sbaddah@*********** ~
$ strace -o /tmp/sftp.out -f /usr/sbin/sftp-server -h
usage: sftp-server [-ehR] [-f log_facility] [-l log_level] [-u umask]

I'll start setting up for dll debugging now.

--
Shaddy


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