Re: Snort DB query question.

[Michael Boman <michael () ayeka dyndns org>]

On Thu, Oct 24, 2002 at 10:22:57PM -0400, larosa, vjay wrote:
> Hello,
>
> I have a question that has been bugging me since I started using the
> database output plugin
> with snort. Why are the IP addresses stored in the DB in the 32 bit format?
> What is the advantage?

I would guess it's speed - it stores the IP addresess in the same format
they are recived from the wire. Doing additional processing would slow
snort down, and when you analyze the data you won't notice the 1/100
sec delay, but snort would.

> I know there must be something I don't know. I know the SELECT
> inet_ntoa(ip_src) ...... trick to convert 
> the IP's back to human readable format, but what if I want to search for a
> CDIR block like 10.10.0.0/16? 
> How would this be done? Is it possible?

SELECT .... 
WHERE inet_ntoa(iphdr.ip_src) > "10.10.0.0" AND 
        inet_ntoa(iphdr.ip_src) < "10.10.255.255"

or

SELECT ....
WHERE iphdr.ip_src > inet_aton("10.10.0.0") AND
        iphdr.ip_src < inet_aton("10.10.255.255")


I think the last example is faster, haven't tried it (wrong OS, not at
work and so on...). And I am sure there are short-cuts for it as well,
check out the documentation for your SQL database (which you failed
to specify).

Best regards
 Michael Boman

-- 
Michael Boman
Student, Husband, Geek. Not necessary in that order though.



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