118 lines
4.0 KiB
Python
118 lines
4.0 KiB
Python
"""Health Check module for DNS service"""
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import os
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import re
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import xmlrpclib
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import commands
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from socket import *
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import base
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class DnsCheck(base.BaseCheck):
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NAME = "DNS Check"
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def run(self):
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installer = self.config.OS_INSTALLER
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method_name = "self.check_" + installer + "_dns()"
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return eval(method_name)
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def check_cobbler_dns(self):
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"""Checks if Cobbler has taken over DNS service"""
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try:
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self.remote = xmlrpclib.Server(
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self.config.COBBLER_INSTALLER_URL,
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allow_none=True)
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self.token = self.remote.login(
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*self.config.COBBLER_INSTALLER_TOKEN)
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except:
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self._set_status(0,
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"[%s]Error: Cannot login to Cobbler "
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"with the tokens provided in the config file"
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% self.NAME)
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return (self.code, self.messages)
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cobbler_settings = self.remote.get_settings()
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if cobbler_settings['manage_dns'] == 0:
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self.messages.append('[DNS]Info: DNS is not managed by Compass')
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return (self.code, self.messages)
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self.check_cobbler_dns_template()
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print "[Done]"
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self.check_dns_service()
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print "[Done]"
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if self.code == 1:
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self.messages.append(
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"[%s]Info: DNS health check has complated. "
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"No problems found, all systems go." % self.NAME)
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return (self.code, self.messages)
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def check_cobbler_dns_template(self):
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"""Validates Cobbler's DNS template file"""
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print "Checking DNS template......",
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if os.path.exists("/etc/cobbler/named.template"):
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VAR_MAP = {"match_port": False,
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"match_allow_query": False,
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}
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f = open("/etc/cobbler/named.template")
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host_ip = gethostbyname(gethostname())
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missing_query = []
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for line in f.readlines():
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if "listen-on port 53" in line and host_ip in line:
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VAR_MAP["match_port"] = True
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if "allow-query" in line:
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for subnet in ["127.0.0.0/8"]:
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if not subnet in line:
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missing_query.append(subnet)
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f.close()
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if VAR_MAP["match_port"] is False:
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self.messages.append(
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"[%s]Error: named service port and/or IP is "
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"misconfigured in /etc/cobbler/named.template"
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% self.NAME)
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if len(missing_query) != 0:
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self.messages.append(
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"[%s]Error: Missing allow_query values in "
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"/etc/cobbler/named.template:%s"
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% (self.Name,
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', '.join(subnet for subnet in missing_query)))
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else:
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VAR_MAP["match_allow_query"] = True
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failed = []
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for var in VAR_MAP.keys():
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if VAR_MAP[var] is False:
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failed.append(var)
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if len(failed) != 0:
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self._set_status(
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0,
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"[%s]Info: DNS template failed components: %s"
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% (self.NAME, ' '.join(f for f in failed)))
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else:
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self._set_status(
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0,
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"[%s]Error: named template file doesn't exist, "
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"health check failed." % self.NAME)
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return True
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def check_dns_service(self):
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"""Checks if DNS is running on port 53"""
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print "Checking DNS service......",
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if not 'named' in commands.getoutput('ps -ef'):
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self._set_status(
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0,
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"[%s]Error: named service does not seem to be running"
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% self.NAME)
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if getservbyport(53) != 'domain':
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self._set_status(
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0,
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"[%s]Error: domain service is not listening on port 53"
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% self.NAME)
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return None
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