<h2>Editing File: /lib/python3.6/site-packages/isc/keyzone.py</h2><form method='post'><textarea name='content' class='file-edit'>############################################################################
# Copyright (C) Internet Systems Consortium, Inc. (&quot;ISC&quot;)
#
# 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:
    &quot;&quot;&quot;reads a zone file to find data relevant to keys&quot;&quot;&quot;

    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('&quot;named-compilezone&quot; not found')
            return

        maxttl = keyttl = None

        fp, _ = Popen([czpath, &quot;-o&quot;, &quot;-&quot;, 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]) &gt; maxttl:
                maxttl = int(fields[1])
            if fields[3] == &quot;DNSKEY&quot;:
                keyttl = int(fields[1])

        self.keyttl = keyttl
        self.maxttl = maxttl
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