unbound/contrib/unbound-querycachedb.py
Wouter Wijngaards e784758a21 - Add --with-libhiredis, unbound support for a new cached backend
that uses a Redis server as the storage.  This implementation
  depends on the hiredis client library (https://redislabs.com/lp/hiredis/).
  And unbound should be built with both --enable-cachedb and
  --with-libhiredis[=PATH] (where $PATH/include/hiredis/hiredis.h
  should exist).  Patch from Jinmei Tatuya (Infoblox).


git-svn-id: file:///svn/unbound/trunk@4586 be551aaa-1e26-0410-a405-d3ace91eadb9
2018-03-15 12:33:51 +00:00

78 lines
2.7 KiB
Python

#!/usr/bin/env python
import hashlib
import sys
import struct
import socket
import time
from optparse import OptionParser
import dns.message
import dns.name
import dns.rdataclass
import dns.rdatatype
def _calc_hashkey(qname, secret, qtype):
qclass = 'IN' # CLASS is fixed for simplicity
hobj = hashlib.sha256()
hobj.update(dns.name.from_text(qname).to_wire())
hobj.update(struct.pack('HH',
socket.htons(dns.rdatatype.from_text(qtype)),
socket.htons(dns.rdataclass.from_text(qclass))))
hobj.update(secret)
return hobj.hexdigest().upper()
def _redis_get(options, key):
import redis
return redis.Redis(options.address, int(options.port)).get(key)
def _dump_value(options, qname, key, value):
print(';; query=%s/IN/%s' % (qname, options.qtype))
print(';; key=%s' % key)
if value is None:
print(';; no value')
return
if len(value) < 16:
print(';; broken value, short length: %d' % len(value))
return
now = int(time.time())
timestamp = struct.unpack('!Q', value[-16:-8])[0]
expire = struct.unpack('!Q', value[-8:])[0]
print(';; Now=%d, TimeStamp=%d, Expire=%d, TTL=%d' %
(now, timestamp, expire, max(expire - now, 0)))
print(dns.message.from_wire(value[:-16]))
def main():
parser = OptionParser(usage='usage: %prog [options] query_name')
parser.add_option("-a", "--address", dest="address", action="store",
default='127.0.0.1', help="backend-server address",
metavar='ADDRESS')
parser.add_option("-b", "--backend", dest="backend", action="store",
default='redis', help="backend name",
metavar='BACKEND')
parser.add_option("-p", "--port", dest="port", action="store",
default='6379', help="backend-server port",
metavar='PORT')
parser.add_option("-s", "--secret", dest="secret", action="store",
default='default', help="secret seed", metavar='SECRET')
parser.add_option("-t", "--qtype", dest="qtype", action="store",
default='A', help="query RR type", metavar='QTYPE')
(options, args) = parser.parse_args()
if len(args) < 1:
parser.error('qname is missing')
if options.backend == 'redis':
get_func = _redis_get
else:
raise Exception('unknown backend name: %s\n' % options.backend)
key = _calc_hashkey(args[0], options.secret, options.qtype)
value = get_func(options, key)
_dump_value(options, args[0], key, value)
if __name__ == '__main__':
try:
main()
except Exception as e:
sys.stderr.write('%s\n' % e)
exit(1)