mirror of
https://github.com/opinkerfi/nagios-plugins.git
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567 lines
22 KiB
Python
Executable File
567 lines
22 KiB
Python
Executable File
#!/usr/bin/env python
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"""Nagios plugin to test for Yum updates on RedHat/CentOS Linux.
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Can optionally alert on any available updates as well as just
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security related updates"""
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__author__ = "Hari Sekhon"
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__title__ = "Nagios Plugin for Yum updates on RedHat/CentOS systems"
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__version__ = "0.7.2"
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# Changes:
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# 0.7.2 added support for rhel6-style yum output
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# Standard Nagios return codes
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OK = 0
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WARNING = 1
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CRITICAL = 2
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UNKNOWN = 3
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import os
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import re
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import sys
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import signal
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OLD_PYTHON = False
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try:
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from subprocess import Popen, PIPE, STDOUT
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except ImportError:
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OLD_PYTHON = True
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import commands
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from optparse import OptionParser
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DEFAULT_TIMEOUT = 30
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def end(status, message, perfdata=''):
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"""Exits the plugin with first arg as the return code and the second
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arg as the message to output"""
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check = "YUM "
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if status == OK:
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print "%sOK: %s | %s" % (check, message, perfdata)
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sys.exit(OK)
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elif status == WARNING:
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print "%sWARNING: %s | %s" % (check, message, perfdata)
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sys.exit(WARNING)
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elif status == CRITICAL:
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print "%sCRITICAL: %s | %s" % (check, message, perfdata)
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sys.exit(CRITICAL)
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else:
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print "UNKNOWN: %s" % message
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sys.exit(UNKNOWN)
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YUM = "/usr/bin/yum"
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def check_yum_usable():
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"""Checks that the YUM program and path are correct and usable - that
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the program exists and is executable, otherwise exits with error"""
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if not os.path.exists(YUM):
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end(UNKNOWN, "%s cannot be found" % YUM)
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elif not os.path.isfile(YUM):
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end(UNKNOWN, "%s is not a file" % YUM)
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elif not os.access(YUM, os.X_OK):
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end(UNKNOWN, "%s is not executable" % YUM)
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class YumTester:
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"""Class to hold all portage test functions and state"""
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def __init__(self):
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"""Initialize all object variables"""
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self.all_updates = False
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self.no_cache_update = False
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self.no_warn_on_lock = False
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self.enable_repo = ""
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self.disable_repo = ""
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self.timeout = DEFAULT_TIMEOUT
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self.verbosity = 0
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self.warn_on_any_update = False
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def validate_all_variables(self):
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"""Validates all object variables to make sure the
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environment is sane"""
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if self.timeout == None:
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self.timeout = DEFAULT_TIMEOUT
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try:
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self.timeout = int(self.timeout)
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except ValueError:
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end(UNKNOWN, "Timeout must be an whole number, " \
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+ "representing the timeout in seconds")
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if self.timeout < 1 or self.timeout > 3600:
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end(UNKNOWN, "Timeout must be a number between 1 and 3600 seconds")
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if self.verbosity == None:
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self.verbosity = 0
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try:
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self.verbosity = int(self.verbosity)
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if self.verbosity < 0:
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raise ValueError
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except ValueError:
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end(UNKNOWN, "Invalid verbosity type, must be positive numeric " \
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+ "integer")
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def run(self, cmd):
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"""runs a system command and returns
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an array of lines of the output"""
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if cmd == "" or cmd == None:
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end(UNKNOWN, "Internal python error - " \
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+ "no cmd supplied for run function")
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if self.no_cache_update:
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cmd += " -C"
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if self.enable_repo:
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for repo in self.enable_repo.split(","):
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cmd += " --enablerepo=%s" % repo
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if self.disable_repo:
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for repo in self.disable_repo.split(","):
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cmd += " --disablerepo=%s" % repo
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self.vprint(3, "running command: %s" % cmd)
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if OLD_PYTHON:
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self.vprint(3, "subprocess not available, probably old python " \
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+ "version, using shell instead")
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returncode, stdout = commands.getstatusoutput(cmd)
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if returncode >= 256:
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returncode = returncode / 256
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else:
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try:
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process = Popen( cmd.split(),
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stdin=PIPE,
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stdout=PIPE,
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stderr=STDOUT )
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except OSError, error:
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error = str(error)
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if error == "No such file or directory":
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end(UNKNOWN, "Cannot find utility '%s'" % cmd.split()[0])
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end(UNKNOWN, "Error trying to run utility '%s' - %s" \
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% (cmd.split()[0], error))
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output = process.communicate()
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returncode = process.returncode
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stdout = output[0]
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if stdout == None or stdout == "":
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end(UNKNOWN, "No output from utility '%s'" % cmd.split()[0])
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self.vprint(3, "Returncode: '%s'\nOutput: '%s'" \
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% (returncode, stdout))
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output = str(stdout).split("\n")
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self.check_returncode(returncode, output)
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return output
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def check_returncode(self, returncode, output):
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"""Takes the returncode and output (as an array of lines)
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of the yum program execution and tests for failures, exits
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with an appropriate message if any are found"""
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if returncode == 0:
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pass
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elif returncode == 100:
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# Updates Available
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pass
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elif returncode == 200:
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if "lock" in output[-2] or "another copy is running" in output[-2]:
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msg = "Cannot check for updates, " \
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+ "another instance of yum is running"
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if self.no_warn_on_lock:
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end(OK, msg)
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else:
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end(WARNING, msg)
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else:
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output = self.strip_output(output)
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end(UNKNOWN, "%s" % output)
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else:
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if not 'Loading "security" plugin' in output \
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or "Command line error: no such option: --security" in output:
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end(UNKNOWN, "Security plugin for yum is required. Try to " \
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+ "'yum install yum-security' and then re-run " \
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+ "this plugin. Alternatively, to just alert on " \
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+ "any update which does not require the security " \
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+ "plugin, try --all-updates")
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else:
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output = self.strip_output(output)
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end(UNKNOWN, "%s" % output)
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def strip_output(self, output):
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"""Cleans up the output from the plugin and returns it.
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Takes and returns an array of the lines of output
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and returns a single string"""
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self.vprint(3, "stripping output of 'Loading ... plugin' lines")
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re_loading_plugin = re.compile("^Loading .+ plugin$")
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output = [re_loading_plugin.sub("", line) for line in output]
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output = " ".join(output).strip()
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return output
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def set_timeout(self):
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"""sets an alarm to time out the test"""
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if self.timeout == 1:
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self.vprint(3, "setting plugin timeout to %s second" \
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% self.timeout)
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else:
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self.vprint(3, "setting plugin timeout to %s seconds"\
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% self.timeout)
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signal.signal(signal.SIGALRM, self.sighandler)
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signal.alarm(self.timeout)
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def sighandler(self, discarded, discarded2):
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"""Function to be called by signal.alarm to kill the plugin"""
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# Nop for these variables
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discarded = discarded2
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discarded2 = discarded
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end(CRITICAL, "Yum nagios plugin has self terminated after " \
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+ "exceeding the timeout (%s seconds)" % self.timeout)
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def get_updates(self):
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"""Checks for updates and returns a tuple containing the number of
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security updates and the number of total updates"""
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self.vprint(2, "checking for any security updates")
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if self.all_updates:
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number_security_updates, number_other_updates = \
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self.get_all_updates()
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else:
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number_other_updates = self.get_security_updates()
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number_security_updates = 0
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return number_security_updates, number_other_updates
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def get_all_updates(self):
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"""Gets all updates. Returns a single integer of the
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number of available updates"""
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cmd = "%s check-update" % YUM
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output = self.run(cmd)
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output2 = "\n".join(output).split("\n\n")
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if self.verbosity >= 4 :
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for section in output2:
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print "\nSection:\n%s\n" % section
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if len(output2) > 2 or \
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not ( "Setting up repositories" in output2[0] or \
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"Loaded plugins: " in output2[0] or \
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re.search('Loading\s+".+"\s+plugin', output2[0]) ):
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end(WARNING, "Yum output signature does not match current known " \
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+ "format. Please make sure you have upgraded to the " \
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+ "latest version of this plugin. If the problem " \
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+ "persists, please contact the author for a fix")
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if len(output2) == 1:
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# There are no updates but we have passed
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# the loading and setting up of repositories
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number_packages = 0
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else:
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number_packages = len([x for x in output2[1].split("\n") \
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if len(x.split()) > 1 ])
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try:
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number_packages = int(number_packages)
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if number_packages < 0:
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raise ValueError
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except ValueError:
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end(UNKNOWN, "Error parsing package information, invalid package " \
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+ "number, yum output may have changed. Please make " \
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+ "sure you have upgraded to the latest version of " \
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+ "this plugin. If the problem persists, then please " \
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+ "contact the author for a fix")
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# Extra layer of checks. This is a security plugin so it's preferable
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# to fail on error rather than pass silently leaving you with an
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# insecure system
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count = 0
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re_package_format = \
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re.compile("^.+\.(i[3456]86|x86_64|noarch)\s+.+\s+.+$")
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# This is to work around a yum truncation issue effectively changing
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# the package output format. Currently only very long kmod lines
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# are seen to have caused this so we stick to what we know for safety
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# and raise an unknown error on anything else for maximum security
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#re_package_format_truncated = \
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# re.compile("^[\w-]+-kmod-\d[\d\.-]+.*\s+.+\s+.+$")
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for line in output:
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if re_package_format.match(line):
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count += 1
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if count != number_packages:
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end(UNKNOWN, "Error parsing package information, inconsistent " \
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+ "package count, yum output may have changed. Please " \
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+ "make sure you have upgraded to the latest version " \
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+ "of this plugin. If the problem persists, then " \
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+ "please contact the author for a fix")
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return number_packages
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def get_security_updates(self):
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"""Gets all updates, but differentiates between
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security and normal updates. Returns a tuple of the number
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of security and normal updates"""
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cmd = "%s --security check-update" % YUM
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output = self.run(cmd)
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re_security_summary_rhel5 = re.compile("Needed \d+ of \d+ packages, for security")
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re_security_summary_rhel6 = re.compile("\d+ package\(s\) needed for security, out of \d+ available")
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re_no_security_updates_available_rhel5 = re.compile("No packages needed, for security, \d+ available")
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re_no_security_updates_available_rhel6 = re.compile("No packages needed for security; \d+ packages available")
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summary_line_found = False
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for line in output:
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if re_no_security_updates_available_rhel5.match(line):
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summary_line_found = True
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number_security_updates = 0
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number_total_updates = line.split()[5]
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break
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if re_no_security_updates_available_rhel6.match(line):
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summary_line_found = True
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number_security_updates = 0
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number_total_updates = line.split()[5]
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break
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if re_security_summary_rhel5.match(line):
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summary_line_found = True
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number_security_updates = line.split()[1]
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number_total_updates = line.split()[3]
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break
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if re_security_summary_rhel6.match(line):
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summary_line_found = True
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number_security_updates = line.split()[0]
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number_total_updates = line.split()[7]
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break
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if not summary_line_found:
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end(WARNING, "Cannot find summary line in yum output. Please " \
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+ "make sure you have upgraded to the latest version " \
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+ "of this plugin. If the problem persists, please " \
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+ "contact the author for a fix")
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try:
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number_security_updates = int(number_security_updates)
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number_total_updates = int(number_total_updates)
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except ValueError:
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end(WARNING, "Error parsing package information, yum output " \
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+ "may have changed. Please make sure you have " \
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+ "upgraded to the latest version of this plugin. " \
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+ "If the problem persists, the please contact the " \
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+ "author for a fix")
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number_other_updates = number_total_updates - number_security_updates
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if len(output) > number_total_updates + 25:
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end(WARNING, "Yum output signature is larger than current known " \
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+ "format, please make sure you have upgraded to the " \
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+ "latest version of this plugin. If the problem " \
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+ "persists, please contact the author for a fix")
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return number_security_updates, number_other_updates
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def test_yum_updates(self):
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"""Starts tests and controls logic flow"""
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check_yum_usable()
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self.vprint(3, "%s - Version %s\nAuthor: %s\n" \
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% (__title__, __version__, __author__))
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self.validate_all_variables()
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self.set_timeout()
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if self.all_updates:
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return self.test_all_updates()
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else:
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return self.test_security_updates()
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def test_all_updates(self):
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"""Tests for all updates, and returns a tuple
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of the status code and output"""
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status = UNKNOWN
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message = "code error - please contact author for a fix"
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number_updates = self.get_all_updates()
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if number_updates == 0:
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status = OK
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message = "0 Updates Available"
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else:
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status = CRITICAL
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if number_updates == 1:
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message = "1 Update Available"
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else:
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message = "%s Updates Available" % number_updates
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return status, message
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def test_security_updates(self):
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"""Tests for security updates and returns a tuple
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of the status code and output"""
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status = UNKNOWN
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message = "code error - please contact author for a fix"
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number_security_updates, number_other_updates = \
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self.get_security_updates()
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if number_security_updates == 0:
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status = OK
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message = "0 Security Updates Available"
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else:
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status = CRITICAL
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if number_security_updates == 1:
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message = "1 Security Update Available"
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elif number_security_updates > 1:
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message = "%s Security Updates Available" \
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% number_security_updates
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if number_other_updates != 0:
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if self.warn_on_any_update == True and status != CRITICAL:
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status = WARNING
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if number_other_updates == 1:
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message += ". 1 Non-Security Update Available"
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else:
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message += ". %s Non-Security Updates Available" \
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% number_other_updates
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return status, message
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def vprint(self, threshold, message):
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"""Prints a message if the first arg is numerically greater than the
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verbosity level"""
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if self.verbosity >= threshold:
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print "%s" % message
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def main():
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"""Parses command line options and calls the test function"""
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tester = YumTester()
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parser = OptionParser()
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parser.add_option( "--all-updates",
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action="store_true",
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dest="all_updates",
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help="Does not distinguish between security and " \
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+ "non-security updates, but returns critical for " \
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+ "any available update. This may be used if the " \
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+ "yum security plugin is absent or you want to " \
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+ "maintain every single package at the latest " \
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+ "version. You may want to use " \
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+ "--warn-on-any-update instead of this option")
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parser.add_option( "--warn-on-any-update",
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action="store_true",
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dest="warn_on_any_update",
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help="Warns if there are any (non-security) package " \
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+ "updates available. By default only warns when " \
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+ "security related updates are available. If " \
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+ "--all-updates is used, then this option is " \
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+ "redundant as --all-updates will return a " \
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+ "critical result on any available update, " \
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+ "whereas using this switch still allows you to " \
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+ "differentiate between the severity of updates ")
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parser.add_option( "-C",
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"--cache-only",
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action="store_true",
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dest="no_cache_update",
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help="Run entirely from cache and do not update the " \
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+ "cache when running yum. Useful if you have " \
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+ "'yum makecache' cronned so that the nagios " \
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+ "check itself doesn't have to do it, possibly " \
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+ "speeding up execution (by 1-2 seconds in tests)")
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parser.add_option( "--no-warn-on-lock",
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action="store_true",
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dest="no_warn_on_lock",
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help="Return OK instead of WARNING when yum is locked " \
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+ "and fails to check for updates due to another " \
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+ "instance running. This is not recommended from " \
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+ "the security standpoint, but may be wanted to " \
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+ "reduce the number of alerts that may " \
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+ "intermittently pop up when someone is running " \
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+ "yum interactively for package management")
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parser.add_option( "--enablerepo",
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dest="repository_to_enable",
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help="Explicitly enables a reposity when calling yum. "
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+ "Can take a comma separated list of repositories")
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parser.add_option( "--disablerepo",
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dest="repository_to_disable",
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help="Explicitly disables a repository when calling yum "
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+ "Can take a comma separated list of repositories")
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parser.add_option( "-t",
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"--timeout",
|
|
dest="timeout",
|
|
help="Sets a timeout in seconds after which the " \
|
|
+"plugin will exit (defaults to %s seconds). " \
|
|
% DEFAULT_TIMEOUT)
|
|
|
|
parser.add_option( "-v",
|
|
"--verbose",
|
|
action="count",
|
|
dest="verbosity",
|
|
help="Verbose mode. Can be used multiple times to " \
|
|
+ "increase output. Use -vvv for debugging output. " \
|
|
+ "By default only one result line is printed as " \
|
|
+ "per Nagios standards")
|
|
|
|
parser.add_option( "-V",
|
|
"--version",
|
|
action="store_true",
|
|
dest="version",
|
|
help="Print version number and exit")
|
|
|
|
(options, args) = parser.parse_args()
|
|
|
|
if args:
|
|
parser.print_help()
|
|
sys.exit(UNKNOWN)
|
|
|
|
tester.all_updates = options.all_updates
|
|
tester.no_cache_update = options.no_cache_update
|
|
tester.no_warn_on_lock = options.no_warn_on_lock
|
|
tester.enable_repo = options.repository_to_enable
|
|
tester.disable_repo = options.repository_to_disable
|
|
tester.timeout = options.timeout
|
|
tester.verbosity = options.verbosity
|
|
tester.warn_on_any_update = options.warn_on_any_update
|
|
|
|
if options.version:
|
|
print "%s - Version %s\nAuthor: %s\n" \
|
|
% (__title__, __version__, __author__)
|
|
sys.exit(OK)
|
|
|
|
result, output = tester.test_yum_updates()
|
|
end(result, output)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
try:
|
|
main()
|
|
except KeyboardInterrupt:
|
|
print "Caught Control-C..."
|
|
sys.exit(CRITICAL)
|