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euca-me.py
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euca-me.py
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#!/usr/bin/python -u
import re
import sys
class PowerDnsQuery(object):
ttl = 30
sip = '127.0.0.1'
def __init__(self, query):
(_type, qname, qclass, qtype, _id, ip) = query
self.has_result = False
qname_lower = qname.lower()
self.results = []
if (qtype == 'SOA' or qtype == 'ANY') and qname_lower == 'euca.me':
self.results.append(
'DATA\t%s\t%s\tSOA\t%d\t-1\tns1.euca.me\tadmin.euca.me\t'
'2018031400\t1800\t900\t604800\t900'
% (qname, qclass, PowerDnsQuery.ttl))
self.has_result = True
if (qtype == 'NS' or qtype == 'ANY') and qname_lower == 'euca.me':
self.results.append('DATA\t%s\t%s\tNS\t%d\t-1\tns1.euca.me'
% (qname, qclass, PowerDnsQuery.ttl))
self.has_result = True
if (qtype == 'MX' or qtype == 'ANY') and qname_lower == 'euca.me':
self.results.append(
'DATA\t%s\t%s\tMX\t%d\t-1\t5\tgmr-smtp-in.l.google.com'
% (qname, qclass, PowerDnsQuery.ttl))
self.results.append(
'DATA\t%s\t%s\tMX\t%d\t-1\t10\talt1.gmr-smtp-in.l.google.com'
% (qname, qclass, PowerDnsQuery.ttl))
self.results.append(
'DATA\t%s\t%s\tMX\t%d\t-1\t20\talt2.gmr-smtp-in.l.google.com'
% (qname, qclass, PowerDnsQuery.ttl))
self.has_result = True
if (qtype == 'CNAME' or qtype == 'ANY') and \
qname_lower == 'www.euca.me':
self.results.append(
'DATA\t%s\t%s\tCNAME\t%d\t-1\t%s'
% (qname, qclass, PowerDnsQuery.ttl,
'dj3ltynlr0evw.cloudfront.net'))
self.has_result = True
if (qtype == 'CNAME' or qtype == 'ANY') and \
qname_lower == 'go.euca.me':
self.results.append(
'DATA\t%s\t%s\tCNAME\t%d\t-1\t%s'
% (qname, qclass, PowerDnsQuery.ttl,
'd3rahf8dg1z1ts.cloudfront.net'))
self.has_result = True
if (qtype == 'A' or qtype == 'ANY') and \
qname_lower == 'euca.me':
# http server
self.results.append(
'DATA\t%s\t%s\tA\t%d\t-1\t%s'
% (qname, qclass, PowerDnsQuery.ttl, PowerDnsQuery.sip))
self.has_result = True
elif (qtype == 'A' or qtype == 'ANY') and \
re.match('^ns[1-9]\.euca\.me$', qname_lower):
# name servers
self.results.append(
'DATA\t%s\t%s\tA\t%d\t-1\t%s'
% (qname, qclass, PowerDnsQuery.ttl, PowerDnsQuery.sip))
self.has_result = True
elif (qtype == 'A' or qtype == 'ANY') and re.match(
'^ec2-(\d{1,3})-(\d{1,3})-(\d{1,3})-(\d{1,3})\.compute\.'
'[a-z0-9-]{0,32}?\d{1,3}-\d{1,3}-\d{1,3}-\d{1,3}\.euca\.me$',
qname_lower):
# instances, ...
match = re.match(
'^ec2-(\d{1,3})-(\d{1,3})-(\d{1,3})-(\d{1,3})\.compute\.'
'[a-z0-9-]{0,32}?\d{1,3}-\d{1,3}-\d{1,3}-\d{1,3}\.euca\.me$',
qname_lower)
self.results.append(
'DATA\t%s\t%s\tA\t%d\t-1\t%s'
% (qname, qclass, PowerDnsQuery.ttl,
'%s.%s.%s.%s' % match.groups()))
self.has_result = True
elif (qtype == 'A' or qtype == 'ANY') and re.match(
'^euca-(\d{1,3})-(\d{1,3})-(\d{1,3})-(\d{1,3})\.eucalyptus\.'
'[a-z0-9-]{0,32}?\d{1,3}-\d{1,3}-\d{1,3}-\d{1,3}\.euca\.me$',
qname_lower):
# instances, ...
match = re.match(
'^euca-(\d{1,3})-(\d{1,3})-(\d{1,3})-(\d{1,3})\.eucalyptus\.'
'[a-z0-9-]{0,32}?\d{1,3}-\d{1,3}-\d{1,3}-\d{1,3}\.euca\.me$',
qname_lower)
self.results.append(
'DATA\t%s\t%s\tA\t%d\t-1\t%s'
% (qname, qclass, PowerDnsQuery.ttl,
'%s.%s.%s.%s' % match.groups()))
self.has_result = True
elif (qtype == 'A' or qtype == 'ANY') and re.match(
'^(?:[a-z0-9-.]{3,63}\.)?[a-z0-9]{1,32}\.[a-z0-9-]{0,32}?'
'(\d{1,3})-(\d{1,3})-(\d{1,3})-(\d{1,3})\.euca\.me$',
qname_lower):
# services ec2, s3, mybucket.s3, ...
match = re.match(
'^(?:[a-z0-9-.]{3,63}\.)?[a-z0-9]{1,32}\.[a-z0-9-]{0,32}?'
'(\d{1,3})-(\d{1,3})-(\d{1,3})-(\d{1,3})\.euca\.me$',
qname_lower)
self.results.append(
'DATA\t%s\t%s\tA\t%d\t-1\t%s'
% (qname, qclass, PowerDnsQuery.ttl,
'%s.%s.%s.%s' % match.groups()))
self.has_result = True
def get_result(self):
if self.has_result:
return '\n'.join(self.results)
else:
return ''
class PowerDnsHandler(object):
def __init__(self, dnsin, dnsout):
self.dnsin = dnsin
self.dnsout = dnsout
self.handle_requests()
def handle_requests(self):
first_request = True
while 1:
rawline = self.dnsin.readline()
if rawline == '':
return
line = rawline.rstrip()
if first_request:
if line == 'HELO\t1':
self.write('OK\tStarting handler')
else:
self.write('FAIL')
rawline = self.dnsin.readline()
sys.exit(1)
first_request = False
else:
query = line.split('\t')
if len(query) != 6:
self.write('LOG\tError parsing query')
self.write('FAIL')
else:
pd_query = PowerDnsQuery(query)
if pd_query.has_result:
pdns_result = pd_query.get_result()
self.write(pdns_result)
self.write('END')
def write(self, message):
self.dnsout.write(message + '\n')
self.dnsout.flush()
if __name__ == '__main__':
PowerDnsHandler(sys.stdin, sys.stdout)