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# Copyright 2014 Huawei Technologies Co. Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Health Check module for DNS service."""
import commands
import os
import socket
import xmlrpclib
from compass.actions.health_check import base
class DnsCheck(base.BaseCheck):
"""dns health check class."""
NAME = "DNS Check"
def run(self):
"""do health check."""
method_name = "self.check_" + self.os_installer['name'] + "_dns()"
return eval(method_name)
def check_cobbler_dns(self):
"""Checks if Cobbler has taken over DNS service."""
try:
remote = xmlrpclib.Server(
self.os_installer['cobbler_url'],
allow_none=True)
credentials = self.os_installer['credentials']
remote.login(
credentials['username'], credentials['password'])
except Exception:
self._set_status(0,
"[%s]Error: Cannot login to Cobbler "
"with the tokens provided in the config file"
% self.NAME)
return (self.code, self.messages)
cobbler_settings = remote.get_settings()
if cobbler_settings['manage_dns'] == 0:
self.messages.append('[DNS]Info: DNS is not managed by Compass')
return (0, self.messages)
self.check_cobbler_dns_template()
print "[Done]"
self.check_dns_service()
print "[Done]"
if self.code == 1:
self.messages.append(
"[%s]Info: DNS health check has complated. "
"No problems found, all systems go." % self.NAME)
return (self.code, self.messages)
def check_cobbler_dns_template(self):
"""Validates Cobbler's DNS template file."""
print "Checking DNS template......",
if os.path.exists("/etc/cobbler/named.template"):
var_map = {
"match_port": False,
"match_allow_query": False,
}
named_template = open("/etc/cobbler/named.template")
host_ip = socket.gethostbyname(socket.gethostname())
missing_query = []
for line in named_template.readlines():
if "listen-on port 53" in line and host_ip in line:
var_map["match_port"] = True
if "allow-query" in line:
for subnet in ["127.0.0.0/8"]:
if subnet not in line:
missing_query.append(subnet)
named_template.close()
if var_map["match_port"] is False:
self.messages.append(
"[%s]Error: named service port "
"and/or IP is misconfigured in "
"/etc/cobbler/named.template" % self.NAME)
if len(missing_query) != 0:
self.messages.append(
"[%s]Error: Missing allow_query values in "
"/etc/cobbler/named.template:%s" % (
self.NAME,
', '.join(subnet for subnet in missing_query)))
else:
var_map["match_allow_query"] = True
fails = []
for var in var_map.keys():
if var_map[var] is False:
fails.append(var)
if len(fails) != 0:
self._set_status(
0,
"[%s]Info: DNS template failed components: "
"%s" % (
self.NAME,
' '.join(failed for failed in fails)))
else:
self._set_status(
0,
"[%s]Error: named template file doesn't exist, "
"health check failed." % self.NAME)
return True
def check_dns_service(self):
"""Checks if DNS is running on port 53."""
print "Checking DNS service......",
if 'named' not in commands.getoutput('ps -ef'):
self._set_status(
0,
"[%s]Error: named service does not seem to be "
"running" % self.NAME)
if socket.getservbyport(53) != 'domain':
self._set_status(
0,
"[%s]Error: domain service is not listening on port "
"53" % self.NAME)
return None
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