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Date: Tue, 2 Oct 2012 21:16:12 +0200
From: magnum <>
Subject: Re: Two questions (or feature suggestion) about JTR usage.

On 2 Oct, 2012, at 16:16 , Richard Miles <> wrote:
> a) I have a script (shell script) calling JTR, consequently I can't get
> progress updates pressing "enter" - the "enter" is sent to shell script and
> not to JTR. What can be done? There is a way or can you consider to add a
> option to automatic display progress on the screen between X minutes
> (defined by user)?

First, you can send a SIGHUP to the john process. This will make it flush and file buffers and emit a status line. Easily usable in scripts.

Second, doc/EXTERNAL describes a way to achieve what you want, but it will be a bit of a hack:

"John the Ripper 1.7.9 and newer pre-defines two additional variables: "abort" and "status", both of type "int".  When set to 1 by an external mode, these cause the current cracking session to be aborted or the status line to be displayed (just like on a keypress), respectively.  These actions are taken after having tested at least all of the candidate passwords that were in external mode's "word" so far.  In other words, the actions may be delayed in order to process any buffered candidate passwords."

If you create an external filter that use this, it might affect performance for fast hashes though.

Finally, adding a command-line option along the lines of --status-every=SECONDS is trivial. In fact I wrote such a patch a while ago but never committed it. I could re-implement it if you want to.

> b) I would like to execute my incremental tests always during 8 hours,
> nothing more and nothing less. There is a workaround to do it?

This is supported by Jumbo, since 1.7.9-jumbo-6. Use --max-run-time=28800 and it will exit cleanly after 8 hours. You can resume it again if you want to, but it will remember that option and only run 8 hours at a time.


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