Re: PCRE and cross packet matching

[Joel Esler <jesler () sourcefire com>]

On Aug 5, 2012, at 5:51 PM, Jason Haar <Jason_Haar () trimble com> wrote:

> In a similar vein, "distance" only applies at the packet level: is there
> an equivalent keyword that applies at the stream level?
Incorrect.  It applies for both.


> <snip>

> The "distance:0" is the problem: the *intent* of the rule is to match
> against the first chars in a TCP stream, whereas it's hitting the first
> chars in any packet of an existing stream. So is there a better way of
> doing that?
>
> BTW, if there are no "stream-based" equivalent to such keywords due to
> resource/complexity issues, how about creating keywords explicitly for
> the first packet of a stream - that is probably 99% of the problem area?

http://manual.snort.org/node33.html#SECTION00469000000000000000

no_stream

------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
_______________________________________________
Snort-users mailing list
Snort-users () lists sourceforge net
Go to this URL to change user options or unsubscribe:
https://lists.sourceforge.net/lists/listinfo/snort-users
Snort-users list archive:
http://www.geocrawler.com/redir-sf.php3?list=snort-users

Please visit http://blog.snort.org to stay current on all the latest Snort news!