Python script that returns a CNAME for every query (source)
#!/usr/bin/python -u
from sys import stdin, stdout
data = stdin.readline()
stdout.write("OK\tMy Backend\n")
stdout.flush()
cname='cname-value.com'
while True:
data = stdin.readline().strip()
kind, qname, qclass, qtype, id, ip = data.split('\t')
if kind == 'Q' and qname not in cname:
r="DATA\t"+qname+"\t"+qclass+"\t"+"SOA\t86400\t-1\tsupport"+qname+" ns1.domain.org 2008080300 1800 3600 604800 3600\n"
if qtype == 'ANY' or qtype == 'CNAME':
r += "DATA\t"+qname+"\t"+qclass+"\tCNAME\t86400\t"+id+"\t"+cname+"\n"
stdout.write(r)
stdout.write("END\n")
stdout.flush()