DNS Metadata extraction

This script is written using scapy 2.1.

Generic usage is:

 [user@box~]$ ./dns_meta.py PCAPFILE 

It can also be sped up by using tcpdump to filter for DNS traffic

 [user@box~]$ tcpdump -r PCAPFILE -w - udp port 53 | ./dns_meta.py /proc/self/fd/0