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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 DHCP service."""
import commands
import os
import re
import socket
import xmlrpclib
from compass.actions.health_check import base
class DhcpCheck(base.BaseCheck):
"""dhcp health check class."""
NAME = "DHCP Check"
def run(self):
"""do health check."""
method_name = "self.check_" + self.os_installer['name'] + "_dhcp()"
return eval(method_name)
def check_cobbler_dhcp(self):
"""Checks if Cobbler has taken over DHCP 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_dhcp'] == 0:
self.messages.append(
"[%s]Info: DHCP service is "
"not managed by Compass" % self.NAME)
self.code = 0
return (self.code, self.messages)
self.check_cobbler_dhcp_template()
print "[Done]"
self.check_dhcp_service()
self.check_dhcp_netmask()
print "[Done]"
if self.code == 1:
self.messages.append(
"[%s]Info: DHCP health check has completed. "
"No problems found, all systems go." % self.NAME)
return (self.code, self.messages)
def check_cobbler_dhcp_template(self):
"""Validates Cobbler's DHCP template file."""
print "Checking DHCP template......",
if os.path.exists("/etc/cobbler/dhcp.template"):
var_map = {
"match_next_server": False,
"match_subnet": False,
"match_filename": False,
"match_range": False,
}
ip_regex = re.compile(r'^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$')
dhcp_template = open("/etc/cobbler/dhcp.template")
for line in dhcp_template.readlines():
if line.find("next_server") != -1:
elmlist = line.split(" ")
for elm in elmlist:
if ";" in elm:
elm = elm[:-2]
if "$next_server" in elm or ip_regex.match(elm):
var_map["match_next_server"] = True
elif line.find("subnet") != -1 and line.find("{") != -1:
elmlist = line.split(" ")
for elm in elmlist:
if ip_regex.match(elm):
if elm[-1] == "0" and "255" not in elm:
var_map["match_subnet"] = True
elif elm[-1] != "0":
self.messages.append(
"[%s]Error: Subnet should be set "
"in the form of 192.168.0.0 in"
"/etc/cobbler/dhcp.template" % self.NAME)
elif line.find("filename") != -1:
var_map["match_filename"] = True
elif line.find("range dynamic-bootp") != -1:
elmlist = line.split(" ")
ip_count = 0
for elm in elmlist:
if ";" in elm and "\n" in elm:
elm = elm[:-2]
if ip_regex.match(elm):
ip_count += 1
if ip_count != 2:
self.messages.append(
"[%s]Error: DHCP range should be set "
"between two IP addresses in "
"/etc/cobbler/dhcp.template" % self.NAME)
else:
var_map["match_range"] = True
dhcp_template.close()
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: DHCP template file "
"failed components: %s" % (
self.NAME, ' '.join(failed for failed in fails)))
else:
self._set_status(
0,
"[%s]Error: DHCP template file doesn't exist, "
"health check failed." % self.NAME)
return True
def check_dhcp_netmask(self):
with open('/etc/dhcp/dhcpd.conf') as conf_reader:
lines = conf_reader.readlines()
for line in lines:
if re.search('^subnet', line):
elm_list = line.split(' ')
break
subnet_ip = elm_list[1]
netmask = elm_list[-2]
subnet_ip_elm = subnet_ip.split('.')
netmask_elm = netmask.split('.')
for index, digit in enumerate(subnet_ip_elm):
if int(digit) & int(netmask_elm[index]) != int(digit):
self._set_status(
0,
"[%s]Info: DHCP subnet IP and "
"netmask do not match" % self.NAME)
break
return True
def check_dhcp_service(self):
"""Checks if DHCP is running on port 67."""
print "Checking DHCP service......",
if not commands.getoutput('pgrep dhcp'):
self._set_status(
0,
"[%s]Error: dhcp service does not "
"seem to be running" % self.NAME)
if socket.getservbyport(67) != 'bootps':
self._set_status(
0,
"[%s]Error: bootps is not listening "
"on port 67" % self.NAME)
return True
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