mirror of
https://github.com/opinkerfi/nagios-plugins.git
synced 2024-12-23 01:23:55 +01:00
567 lines
22 KiB
Python
Executable File
567 lines
22 KiB
Python
Executable File
#!/usr/bin/env python
|
|
|
|
"""Nagios plugin to test for Yum updates on RedHat/CentOS Linux.
|
|
Can optionally alert on any available updates as well as just
|
|
security related updates"""
|
|
|
|
__author__ = "Hari Sekhon"
|
|
__title__ = "Nagios Plugin for Yum updates on RedHat/CentOS systems"
|
|
__version__ = "0.7.2"
|
|
|
|
# Changes:
|
|
# 0.7.2 added support for rhel6-style yum output
|
|
|
|
|
|
# Standard Nagios return codes
|
|
OK = 0
|
|
WARNING = 1
|
|
CRITICAL = 2
|
|
UNKNOWN = 3
|
|
|
|
import os
|
|
import re
|
|
import sys
|
|
import signal
|
|
OLD_PYTHON = False
|
|
try:
|
|
from subprocess import Popen, PIPE, STDOUT
|
|
except ImportError:
|
|
OLD_PYTHON = True
|
|
import commands
|
|
from optparse import OptionParser
|
|
|
|
DEFAULT_TIMEOUT = 30
|
|
|
|
|
|
def end(status, message, perfdata=''):
|
|
"""Exits the plugin with first arg as the return code and the second
|
|
arg as the message to output"""
|
|
|
|
check = "YUM "
|
|
if status == OK:
|
|
print "%sOK: %s | %s" % (check, message, perfdata)
|
|
sys.exit(OK)
|
|
elif status == WARNING:
|
|
print "%sWARNING: %s | %s" % (check, message, perfdata)
|
|
sys.exit(WARNING)
|
|
elif status == CRITICAL:
|
|
print "%sCRITICAL: %s | %s" % (check, message, perfdata)
|
|
sys.exit(CRITICAL)
|
|
else:
|
|
print "UNKNOWN: %s" % message
|
|
sys.exit(UNKNOWN)
|
|
|
|
|
|
YUM = "/usr/bin/yum"
|
|
|
|
def check_yum_usable():
|
|
"""Checks that the YUM program and path are correct and usable - that
|
|
the program exists and is executable, otherwise exits with error"""
|
|
|
|
if not os.path.exists(YUM):
|
|
end(UNKNOWN, "%s cannot be found" % YUM)
|
|
elif not os.path.isfile(YUM):
|
|
end(UNKNOWN, "%s is not a file" % YUM)
|
|
elif not os.access(YUM, os.X_OK):
|
|
end(UNKNOWN, "%s is not executable" % YUM)
|
|
|
|
|
|
class YumTester:
|
|
"""Class to hold all portage test functions and state"""
|
|
|
|
def __init__(self):
|
|
"""Initialize all object variables"""
|
|
|
|
self.all_updates = False
|
|
self.no_cache_update = False
|
|
self.no_warn_on_lock = False
|
|
self.enable_repo = ""
|
|
self.disable_repo = ""
|
|
self.timeout = DEFAULT_TIMEOUT
|
|
self.verbosity = 0
|
|
self.warn_on_any_update = False
|
|
|
|
def validate_all_variables(self):
|
|
"""Validates all object variables to make sure the
|
|
environment is sane"""
|
|
|
|
if self.timeout == None:
|
|
self.timeout = DEFAULT_TIMEOUT
|
|
try:
|
|
self.timeout = int(self.timeout)
|
|
except ValueError:
|
|
end(UNKNOWN, "Timeout must be an whole number, " \
|
|
+ "representing the timeout in seconds")
|
|
|
|
if self.timeout < 1 or self.timeout > 3600:
|
|
end(UNKNOWN, "Timeout must be a number between 1 and 3600 seconds")
|
|
|
|
if self.verbosity == None:
|
|
self.verbosity = 0
|
|
try:
|
|
self.verbosity = int(self.verbosity)
|
|
if self.verbosity < 0:
|
|
raise ValueError
|
|
except ValueError:
|
|
end(UNKNOWN, "Invalid verbosity type, must be positive numeric " \
|
|
+ "integer")
|
|
|
|
|
|
def run(self, cmd):
|
|
"""runs a system command and returns
|
|
an array of lines of the output"""
|
|
|
|
if cmd == "" or cmd == None:
|
|
end(UNKNOWN, "Internal python error - " \
|
|
+ "no cmd supplied for run function")
|
|
|
|
if self.no_cache_update:
|
|
cmd += " -C"
|
|
|
|
if self.enable_repo:
|
|
for repo in self.enable_repo.split(","):
|
|
cmd += " --enablerepo=%s" % repo
|
|
if self.disable_repo:
|
|
for repo in self.disable_repo.split(","):
|
|
cmd += " --disablerepo=%s" % repo
|
|
|
|
self.vprint(3, "running command: %s" % cmd)
|
|
|
|
if OLD_PYTHON:
|
|
self.vprint(3, "subprocess not available, probably old python " \
|
|
+ "version, using shell instead")
|
|
returncode, stdout = commands.getstatusoutput(cmd)
|
|
if returncode >= 256:
|
|
returncode = returncode / 256
|
|
else:
|
|
try:
|
|
process = Popen( cmd.split(),
|
|
stdin=PIPE,
|
|
stdout=PIPE,
|
|
stderr=STDOUT )
|
|
except OSError, error:
|
|
error = str(error)
|
|
if error == "No such file or directory":
|
|
end(UNKNOWN, "Cannot find utility '%s'" % cmd.split()[0])
|
|
end(UNKNOWN, "Error trying to run utility '%s' - %s" \
|
|
% (cmd.split()[0], error))
|
|
|
|
output = process.communicate()
|
|
returncode = process.returncode
|
|
stdout = output[0]
|
|
|
|
if stdout == None or stdout == "":
|
|
end(UNKNOWN, "No output from utility '%s'" % cmd.split()[0])
|
|
|
|
self.vprint(3, "Returncode: '%s'\nOutput: '%s'" \
|
|
% (returncode, stdout))
|
|
output = str(stdout).split("\n")
|
|
self.check_returncode(returncode, output)
|
|
|
|
return output
|
|
|
|
|
|
def check_returncode(self, returncode, output):
|
|
"""Takes the returncode and output (as an array of lines)
|
|
of the yum program execution and tests for failures, exits
|
|
with an appropriate message if any are found"""
|
|
|
|
if returncode == 0:
|
|
pass
|
|
elif returncode == 100:
|
|
# Updates Available
|
|
pass
|
|
elif returncode == 200:
|
|
if "lock" in output[-2] or "another copy is running" in output[-2]:
|
|
msg = "Cannot check for updates, " \
|
|
+ "another instance of yum is running"
|
|
if self.no_warn_on_lock:
|
|
end(OK, msg)
|
|
else:
|
|
end(WARNING, msg)
|
|
else:
|
|
output = self.strip_output(output)
|
|
end(UNKNOWN, "%s" % output)
|
|
else:
|
|
if not 'Loading "security" plugin' in output \
|
|
or "Command line error: no such option: --security" in output:
|
|
end(UNKNOWN, "Security plugin for yum is required. Try to " \
|
|
+ "'yum install yum-security' and then re-run " \
|
|
+ "this plugin. Alternatively, to just alert on " \
|
|
+ "any update which does not require the security " \
|
|
+ "plugin, try --all-updates")
|
|
else:
|
|
output = self.strip_output(output)
|
|
end(UNKNOWN, "%s" % output)
|
|
|
|
|
|
def strip_output(self, output):
|
|
"""Cleans up the output from the plugin and returns it.
|
|
Takes and returns an array of the lines of output
|
|
and returns a single string"""
|
|
|
|
self.vprint(3, "stripping output of 'Loading ... plugin' lines")
|
|
re_loading_plugin = re.compile("^Loading .+ plugin$")
|
|
output = [re_loading_plugin.sub("", line) for line in output]
|
|
output = " ".join(output).strip()
|
|
return output
|
|
|
|
|
|
def set_timeout(self):
|
|
"""sets an alarm to time out the test"""
|
|
|
|
if self.timeout == 1:
|
|
self.vprint(3, "setting plugin timeout to %s second" \
|
|
% self.timeout)
|
|
else:
|
|
self.vprint(3, "setting plugin timeout to %s seconds"\
|
|
% self.timeout)
|
|
|
|
signal.signal(signal.SIGALRM, self.sighandler)
|
|
signal.alarm(self.timeout)
|
|
|
|
|
|
def sighandler(self, discarded, discarded2):
|
|
"""Function to be called by signal.alarm to kill the plugin"""
|
|
|
|
# Nop for these variables
|
|
discarded = discarded2
|
|
discarded2 = discarded
|
|
|
|
end(CRITICAL, "Yum nagios plugin has self terminated after " \
|
|
+ "exceeding the timeout (%s seconds)" % self.timeout)
|
|
|
|
|
|
def get_updates(self):
|
|
"""Checks for updates and returns a tuple containing the number of
|
|
security updates and the number of total updates"""
|
|
|
|
self.vprint(2, "checking for any security updates")
|
|
|
|
if self.all_updates:
|
|
number_security_updates, number_other_updates = \
|
|
self.get_all_updates()
|
|
else:
|
|
number_other_updates = self.get_security_updates()
|
|
number_security_updates = 0
|
|
|
|
return number_security_updates, number_other_updates
|
|
|
|
|
|
def get_all_updates(self):
|
|
"""Gets all updates. Returns a single integer of the
|
|
number of available updates"""
|
|
|
|
cmd = "%s check-update" % YUM
|
|
|
|
output = self.run(cmd)
|
|
|
|
output2 = "\n".join(output).split("\n\n")
|
|
if self.verbosity >= 4 :
|
|
for section in output2:
|
|
print "\nSection:\n%s\n" % section
|
|
if len(output2) > 2 or \
|
|
not ( "Setting up repositories" in output2[0] or \
|
|
"Loaded plugins: " in output2[0] or \
|
|
re.search('Loading\s+".+"\s+plugin', output2[0]) ):
|
|
end(WARNING, "Yum output signature does not match current known " \
|
|
+ "format. Please make sure you have upgraded to the " \
|
|
+ "latest version of this plugin. If the problem " \
|
|
+ "persists, please contact the author for a fix")
|
|
if len(output2) == 1:
|
|
# There are no updates but we have passed
|
|
# the loading and setting up of repositories
|
|
number_packages = 0
|
|
else:
|
|
number_packages = len([x for x in output2[1].split("\n") \
|
|
if len(x.split()) > 1 ])
|
|
|
|
try:
|
|
number_packages = int(number_packages)
|
|
if number_packages < 0:
|
|
raise ValueError
|
|
except ValueError:
|
|
end(UNKNOWN, "Error parsing package information, invalid package " \
|
|
+ "number, yum output may have changed. Please make " \
|
|
+ "sure you have upgraded to the latest version of " \
|
|
+ "this plugin. If the problem persists, then please " \
|
|
+ "contact the author for a fix")
|
|
|
|
# Extra layer of checks. This is a security plugin so it's preferable
|
|
# to fail on error rather than pass silently leaving you with an
|
|
# insecure system
|
|
count = 0
|
|
re_package_format = \
|
|
re.compile("^.+\.(i[3456]86|x86_64|noarch)\s+.+\s+.+$")
|
|
# This is to work around a yum truncation issue effectively changing
|
|
# the package output format. Currently only very long kmod lines
|
|
# are seen to have caused this so we stick to what we know for safety
|
|
# and raise an unknown error on anything else for maximum security
|
|
#re_package_format_truncated = \
|
|
# re.compile("^[\w-]+-kmod-\d[\d\.-]+.*\s+.+\s+.+$")
|
|
for line in output:
|
|
if re_package_format.match(line):
|
|
count += 1
|
|
if count != number_packages:
|
|
end(UNKNOWN, "Error parsing package information, inconsistent " \
|
|
+ "package count, yum output may have changed. Please " \
|
|
+ "make sure you have upgraded to the latest version " \
|
|
+ "of this plugin. If the problem persists, then " \
|
|
+ "please contact the author for a fix")
|
|
|
|
return number_packages
|
|
|
|
|
|
def get_security_updates(self):
|
|
"""Gets all updates, but differentiates between
|
|
security and normal updates. Returns a tuple of the number
|
|
of security and normal updates"""
|
|
|
|
cmd = "%s --security check-update" % YUM
|
|
|
|
output = self.run(cmd)
|
|
|
|
re_security_summary_rhel5 = re.compile("Needed \d+ of \d+ packages, for security")
|
|
re_security_summary_rhel6 = re.compile("\d+ package\(s\) needed for security, out of \d+ available")
|
|
re_no_security_updates_available_rhel5 = re.compile("No packages needed, for security, \d+ available")
|
|
re_no_security_updates_available_rhel6 = re.compile("No packages needed for security; \d+ packages available")
|
|
summary_line_found = False
|
|
for line in output:
|
|
if re_no_security_updates_available_rhel5.match(line):
|
|
summary_line_found = True
|
|
number_security_updates = 0
|
|
number_total_updates = line.split()[5]
|
|
break
|
|
if re_no_security_updates_available_rhel6.match(line):
|
|
summary_line_found = True
|
|
number_security_updates = 0
|
|
number_total_updates = line.split()[5]
|
|
break
|
|
if re_security_summary_rhel5.match(line):
|
|
summary_line_found = True
|
|
number_security_updates = line.split()[1]
|
|
number_total_updates = line.split()[3]
|
|
break
|
|
if re_security_summary_rhel6.match(line):
|
|
summary_line_found = True
|
|
number_security_updates = line.split()[0]
|
|
number_total_updates = line.split()[7]
|
|
break
|
|
|
|
if not summary_line_found:
|
|
end(WARNING, "Cannot find summary line in yum output. Please " \
|
|
+ "make sure you have upgraded to the latest version " \
|
|
+ "of this plugin. If the problem persists, please " \
|
|
+ "contact the author for a fix")
|
|
|
|
try:
|
|
number_security_updates = int(number_security_updates)
|
|
number_total_updates = int(number_total_updates)
|
|
except ValueError:
|
|
end(WARNING, "Error parsing package information, yum output " \
|
|
+ "may have changed. Please make sure you have " \
|
|
+ "upgraded to the latest version of this plugin. " \
|
|
+ "If the problem persists, the please contact the " \
|
|
+ "author for a fix")
|
|
|
|
number_other_updates = number_total_updates - number_security_updates
|
|
|
|
if len(output) > number_total_updates + 25:
|
|
end(WARNING, "Yum output signature is larger than current known " \
|
|
+ "format, please make sure you have upgraded to the " \
|
|
+ "latest version of this plugin. If the problem " \
|
|
+ "persists, please contact the author for a fix")
|
|
|
|
return number_security_updates, number_other_updates
|
|
|
|
|
|
def test_yum_updates(self):
|
|
"""Starts tests and controls logic flow"""
|
|
|
|
check_yum_usable()
|
|
self.vprint(3, "%s - Version %s\nAuthor: %s\n" \
|
|
% (__title__, __version__, __author__))
|
|
|
|
self.validate_all_variables()
|
|
self.set_timeout()
|
|
|
|
if self.all_updates:
|
|
return self.test_all_updates()
|
|
else:
|
|
return self.test_security_updates()
|
|
|
|
|
|
def test_all_updates(self):
|
|
"""Tests for all updates, and returns a tuple
|
|
of the status code and output"""
|
|
|
|
status = UNKNOWN
|
|
message = "code error - please contact author for a fix"
|
|
|
|
number_updates = self.get_all_updates()
|
|
if number_updates == 0:
|
|
status = OK
|
|
message = "0 Updates Available"
|
|
else:
|
|
status = CRITICAL
|
|
if number_updates == 1:
|
|
message = "1 Update Available"
|
|
else:
|
|
message = "%s Updates Available" % number_updates
|
|
|
|
return status, message
|
|
|
|
|
|
def test_security_updates(self):
|
|
"""Tests for security updates and returns a tuple
|
|
of the status code and output"""
|
|
|
|
status = UNKNOWN
|
|
message = "code error - please contact author for a fix"
|
|
|
|
number_security_updates, number_other_updates = \
|
|
self.get_security_updates()
|
|
if number_security_updates == 0:
|
|
status = OK
|
|
message = "0 Security Updates Available"
|
|
else:
|
|
status = CRITICAL
|
|
if number_security_updates == 1:
|
|
message = "1 Security Update Available"
|
|
elif number_security_updates > 1:
|
|
message = "%s Security Updates Available" \
|
|
% number_security_updates
|
|
|
|
if number_other_updates != 0:
|
|
if self.warn_on_any_update == True and status != CRITICAL:
|
|
status = WARNING
|
|
if number_other_updates == 1:
|
|
message += ". 1 Non-Security Update Available"
|
|
else:
|
|
message += ". %s Non-Security Updates Available" \
|
|
% number_other_updates
|
|
|
|
return status, message
|
|
|
|
|
|
def vprint(self, threshold, message):
|
|
"""Prints a message if the first arg is numerically greater than the
|
|
verbosity level"""
|
|
|
|
if self.verbosity >= threshold:
|
|
print "%s" % message
|
|
|
|
|
|
def main():
|
|
"""Parses command line options and calls the test function"""
|
|
|
|
tester = YumTester()
|
|
parser = OptionParser()
|
|
|
|
parser.add_option( "--all-updates",
|
|
action="store_true",
|
|
dest="all_updates",
|
|
help="Does not distinguish between security and " \
|
|
+ "non-security updates, but returns critical for " \
|
|
+ "any available update. This may be used if the " \
|
|
+ "yum security plugin is absent or you want to " \
|
|
+ "maintain every single package at the latest " \
|
|
+ "version. You may want to use " \
|
|
+ "--warn-on-any-update instead of this option")
|
|
|
|
parser.add_option( "--warn-on-any-update",
|
|
action="store_true",
|
|
dest="warn_on_any_update",
|
|
help="Warns if there are any (non-security) package " \
|
|
+ "updates available. By default only warns when " \
|
|
+ "security related updates are available. If " \
|
|
+ "--all-updates is used, then this option is " \
|
|
+ "redundant as --all-updates will return a " \
|
|
+ "critical result on any available update, " \
|
|
+ "whereas using this switch still allows you to " \
|
|
+ "differentiate between the severity of updates ")
|
|
|
|
parser.add_option( "-C",
|
|
"--cache-only",
|
|
action="store_true",
|
|
dest="no_cache_update",
|
|
help="Run entirely from cache and do not update the " \
|
|
+ "cache when running yum. Useful if you have " \
|
|
+ "'yum makecache' cronned so that the nagios " \
|
|
+ "check itself doesn't have to do it, possibly " \
|
|
+ "speeding up execution (by 1-2 seconds in tests)")
|
|
|
|
parser.add_option( "--no-warn-on-lock",
|
|
action="store_true",
|
|
dest="no_warn_on_lock",
|
|
help="Return OK instead of WARNING when yum is locked " \
|
|
+ "and fails to check for updates due to another " \
|
|
+ "instance running. This is not recommended from " \
|
|
+ "the security standpoint, but may be wanted to " \
|
|
+ "reduce the number of alerts that may " \
|
|
+ "intermittently pop up when someone is running " \
|
|
+ "yum interactively for package management")
|
|
|
|
parser.add_option( "--enablerepo",
|
|
dest="repository_to_enable",
|
|
help="Explicitly enables a reposity when calling yum. "
|
|
+ "Can take a comma separated list of repositories")
|
|
|
|
parser.add_option( "--disablerepo",
|
|
dest="repository_to_disable",
|
|
help="Explicitly disables a repository when calling yum "
|
|
+ "Can take a comma separated list of repositories")
|
|
|
|
parser.add_option( "-t",
|
|
"--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)
|