On Sat, Feb 8, 2014 at 3:34 AM, Jonathan Lassoff <jof@thejof.com> wrote:
This is going to be tricky to do, as DNS packets don't necessarily contain entire query values or FQDNs as complete strings due to packet label compression (remember, original DNS only has 512 bytes to work with).
Howdy, The DNS query essentially always contains the full string in a sequence. It doesn't *have* to per the protocol but you'll be hard pressed to find a real-world example where it doesn't. The catch is, the dots aren't encoded. The components of the name being queried are separated by a byte indicating the length of the next piece. So, instead of www.google.com the query packet contains www 0x06 google 0x03 com. You can implement this with --hex-string instead of --string but you'll have to convert the entire thing to hex first Regards, Bill Herrin -- William D. Herrin ................ herrin@dirtside.com bill@herrin.us 3005 Crane Dr. ...................... Web: <http://bill.herrin.us/> Falls Church, VA 22042-3004