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Date: Fri, 14 Jun 2013 03:09:22 +0200
From: magnum <john.magnum@...hmail.com>
To: john-users@...ts.openwall.com
Subject: Re: Resume for KDEPaste external mode
On 13 Jun, 2013, at 0:41 , Solar Designer <solar@...nwall.com> wrote:
> On Wed, Jun 12, 2013 at 11:57:41PM +0200, magnum wrote:
>> On 12 Jun, 2013, at 23:45 , magnum <john.magnum@...hmail.com> wrote:
>>> KDEPaste lacks a restore() function. If you resume it, it will just restart from scratch. My first question is: Should this not be detected and resulting in refusal to resume? Or could some modes work fine without a resume() function? I guess some could... but at least we should warn or something?
>>
>> On second thought I really think it should bail out with error. Modes that don't really need any special code should implement a dummy restore(). I will try implementing this in Jumbo and see where it goes but it should be in core too IMHO.
>
> There are definitely external modes that are --restore'able even though
> they lack a restore(). Warning when there's no restore() and adding a
> dummy restore() to those formats to suppress the new warnings is an
> interesting idea.
It's in bleeding now. I'd rather bail out than just warn though - when you see the warning your .rec file is already screwed. AFAIK we have no external mode that [has generate() but] lacks restore() and anyone having their own would just have to add a dummy restore().
> I was also thinking of some way to make interrupt/restore of external
> modes easier - such as by introducing a way to declare external mode
> variables that would be automatically saved and restored (maybe have
> "static" mean this, or introduce a keyword of our own - e.g., "restore").
> In terms of implementation, we could either traverse the variables list
> and save/restore the needed ones - or we could have these placed in a
> separate memory region, which would be saved/restored in its entirety.
I like "static". Maybe I can pull that off too.
magnum
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