toy recursive DNS resolver that does its own parsing and socket communication, just for fun
implements some of rfc 1035 (only does A and MX records)
there's like a million of these out there, and this one is not particularly good, but,
$ ./dns.py
A twitter.com: 104.244.42.65
MX google.com: alt1.aspmx.l.google.com.
inspired by