guenther at rudersport
Jul 24, 2009, 8:03 AM
Post #4 of 4
(251 views)
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On Fri, 2009-07-24 at 10:05 -0400, Matt Sergeant wrote:
> On Fri, 24 Jul 2009 16:09:46 +0300, Henrik Krohns wrote:
> > I would add \b or so in front of the sigs..
> >
> > For example, /zief\.pl\//i should be /\bzief\.pl\//i. Unbounded short
> > domains like that have chances of FPs.
>
> Plus they should be URI rules, otherwise you're just re-scanning the
> entire body.
Exactly my thought, when I saw this on the users list. These should be
uri rules, which will be *much* faster.
More importantly, though -- they need to be uri rules, to NOT FP with a
text match. This is exactly the problem ClamAV third-party sig writers
focusing on URIs currently are struggling with, because there is no
equivalent to SA uri rules, nor *any* way to have such sigs properly
bound. With ClamAV that is. ;) Much discussed recently.
For the very same reason I agree with Henrik. If used in SA, these not
only should be URI rules, but need to be bound. Both, at the beginning
and end. At the very least, using \b, need something slightly more
sophisticated for the end, to exclude a dot.
acebook.com, anyone? ;-)
--
char *t="\10pse\0r\0dtu\0.@ghno\x4e\xc8\x79\xf4\xab\x51\x8a\x10\xf4\xf4\xc4";
main(){ char h,m=h=*t++,*x=t+2*h,c,i,l=*x,s=0; for (i=0;i<l;i++){ i%8? c<<=1:
(c=*++x); c&128 && (s+=h); if (!(h>>=1)||!t[s+h]){ putchar(t[s]);h=m;s=0; }}}
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