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Re: ZoneAlarm Suite popen hang

On Mon, 9 Jan 2006, Brett Serkez wrote:

> [snip]
> Using -vvv I see the hang is occuring when ssh executes the
> following command:
> sh -c /usr/X11R6/bin/xauth -f /tmp/ssh-OrQEQQHWXE/xauthfile generate 7..0.1:0.0 MIT-MAGIC-COOKIE-1 untrusted timeout 1200 2 > /dev/null
>   /usr/X11R6/bin/xauth:  creating new authority file
>   /home/brett/.Xauthority
> Running this command by hand, it looks like it is hanging, but actually
> it is waiting for the command 'exit' on stdin.  Typing exit confirms
> this with a return to the parent shell prompt.
> This becomes more obvious when the stderr redirection is removed:
> sh -c /usr/X11R6/bin/xauth -f /tmp/ssh-OrQEQQHWXE/xauthfile generate 8..0.1:0.0 MIT-MAGIC-COOKIE-1 untrusted timeout 1200
>   /usr/X11R6/bin/xauth:  creating new authority file
>   /home/brett/.Xauthority Using authority file /home/bserkez/.Xauthority
> xauth>
> It looks to me on the surface as if ZoneAlarm is interfering with the
> communication between ssh and xauth via the popen().  This isn't
> completely dissimilar to pipe issues that have been discussed in other
> areas, such as with rsync.
> I'm not sure what the next step would be, looking for ideas.

It could also be that the script is assuming that ssh will close stdin.
Try adding a redirection of stdin from /dev/null as well (i.e., use

sh -c /usr/X11R6/bin/xauth -f /tmp/ssh-OrQEQQHWXE/xauthfile generate 7..0.1:0.0 MIT-MAGIC-COOKIE-1 untrusted timeout 1200 2 > /dev/null < /dev/null

) and see if it helps.  If it does, the script is actually buggy, and
needs to be fixed.
      |\      _,,,---,,_ |
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