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############################################################################
# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, you can obtain one at https://mozilla.org/MPL/2.0/.
#
# See the COPYRIGHT file distributed with this work for additional
# information regarding copyright ownership.
############################################################################
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 type(line) is not str:
line = line.decode('ascii')
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