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File name : keyzone.py

Content :############################################################################ # 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

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