Snort mailing list archives

Re: byte_test question


From: Joel Esler <jesler () sourcefire com>
Date: Fri, 24 Aug 2012 14:18:10 -0400

You'd probably have to write a shared object rule then.  

--
Joel Esler

On Aug 24, 2012, at 1:43 PM, "harry.tuttle" <harry.tuttle () zoho com> wrote:

But I don't want to see if byte A matches byte B. I want to see if byte A differs from byte B by |n|.


---- On Fri, 24 Aug 2012 09:28:08 -0700 Joel Esler  wrote ---- 

byte_extract. 

If I am reading what you are saying correctly. Extract one byte then to a byte_test to see if the second byte 
matches the first. 


On Aug 24, 2012, at 11:58 AM, "harry.tuttle"  wrote: 

I'm pretty sure there is no way to do this; someone please clue me in if I am missing something. 

I'd like to be able to test if two bytes differ by a certain amount. One or the other could be larger; the values 
of the bytes will vary, but they will always differ by the same amount. 

Thanks, 
Harry 


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