Re: sftp

[Corinna Vinschen <cygwin at cygwin dot com>]

On Thu, Apr 05, 2001 at 02:04:16PM +0200, Ronald Hecht wrote:
> 
> 
> Corinna Vinschen schrieb:
> > 
> > On Wed, Apr 04, 2001 at 07:01:07PM +0200, Ronald Hecht wrote:
> > > Hi,
> > >
> > > i called sftp with -v -v -v and got
> > >
> > > sftp> ls
> > > debug3: Sending SSH2_FXP_READDIR I:3
> > > debug3: Received reply T:104 I:3
> > > debug3: Received 38 SSH2_FXP_NAME responses
> > > d---------   21 administ Domänen-     8192 Apr  16:55 .
> > > drwxrwxrwx    5 administ Domänen-        0 Jan  09:06 ..
> > > drwxrwxrwx    2 administ Domänen-        0 Apr  13:38 .autosave
> > > -rwx------    1 hr55     Domänen-      767 Mar  07:42 .bashrc
> > >                               ....
> > > debug3: Sending SSH2_FXP_READDIR I:4
> > >
> > > and now it hangs. Seems to me, that the sftp-server did not respond to
> > > the second SSH2_FXP_READDIR.
> > 
> > This doesn't help, unfortunately. The connection is made, the
> > sftp-server (you are using the one I sent yesterday, aren't you?)
> > is up and running.
> > 
> > The problem is that I can't reproduce the problem. I have tried
> > both, RSA and Password authentication, both a local connection
> > and from a Linux box and with ash, bash and tcsh as login shell.
> > Either way sftp works as expected.
> > 
> > We need somebody to seriously debug that problem.
> > 
> 
> I would do that, but I don't really know how to debug a service or
> deamon. I've tried with syslog using TRACE (see my last mail), but this
> isn't really what I understand of debugging, isn't it? Can you or anyone
> else help me?

Did you try to reproduce that behaviour when starting sshd from
the command line using `sshd -d'? If that works, you can start
sshd from strace:

	strace -o sshd.strace.out -f C:/cygwin/usr/sbin/sshd -d

and looking through the strace output.

Another chance is to connect to your hanging sftp-server using
gdb. When the program hangs, call `ps' to get the Windows PID
of sftp-server and call

	gdb -nw /usr/sbin/sshd WINPID

Then you can get switch to thread 1

	thread 1

and print a stacktrace

	bt

which could help.

Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                                mailto:cygwin@cygwin.com
Red Hat, Inc.

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