[Snort-users] Which options determine which packets are matched?

Sweth Chandramouli snort-users at ...2354...
Wed Jun 20 15:16:17 EDT 2001

On Wed, Jun 20, 2001 at 12:36:39PM -0400, Sweth Chandramouli wrote:
> 	.  So, in theory, any pair of filters that are identical
> for those fields are "the same", even if other options like msg happen
> to be different.

	And, of course, the non-action portions of their respective
rules headers.  That brings up another question, with regards to variable
interpolation.  The arachNIDS and snort.org rules, to cite one example,
use different variable names for the same thing; the former might use


	while the latter would use


	.  The system I'm building is for postprocessing of alert
messages, so it has no way of knowing how the original variables were
expanded (that is, it doesn't have access to the original conf files); it
just has a list of the rules that are out there in use.  I know it isn't
an algorithmically perfect solution, but I was thinking of just saying 
that a given token in the rules headers matches if the text matches, or
if the text in both tokens are variables with any names.  Is that too
lenient a criterion?
	(I know that for the arachNIDS/snort.org case, I can 
usually determine matching via the references options, but that doesn't
apply for all of the rules I'm dealing with.)

	-- Sweth.

Sweth Chandramouli ; <svc at ...2353...>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 236 bytes
Desc: not available
URL: <https://lists.snort.org/pipermail/snort-users/attachments/20010620/89fdc61e/attachment.sig>

More information about the Snort-users mailing list