keyzone.py revision a27dc50157eb8267becffcd800eb1abf7e16ae7c
############################################################################
# Copyright (C) 2013-2016 Internet Systems Consortium, Inc. ("ISC")
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
# OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
# PERFORMANCE OF THIS SOFTWARE.
############################################################################
import os
import sys
import re
from subprocess import Popen, PIPE
########################################################################
# Exceptions
########################################################################
class KeyZoneException(Exception):
pass
########################################################################
# class keyzone
########################################################################
class keyzone:
"""reads a zone file to find data relevant to keys"""
def __init__(self, name, filename, czpath):
self.maxttl = None
self.keyttl = None
if not name:
return
if not czpath or not os.path.isfile(czpath) \
or not os.access(czpath, os.X_OK):
raise KeyZoneException('"named-compilezone" not found')
return
maxttl = keyttl = None
fp, _ = Popen([czpath, "-o", "-", name, filename],
stdout=PIPE, stderr=PIPE).communicate()
for line in fp.splitlines():
if re.search('^[:space:]*;', line):
continue
fields = line.split()
if not maxttl or int(fields[1]) > maxttl:
maxttl = int(fields[1])
if fields[3] == "DNSKEY":
keyttl = int(fields[1])
self.keyttl = keyttl
self.maxttl = maxttl