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check_nginx_version.py
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check_nginx_version.py
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#!/usr/bin/env python
# vim:ts=4:sts=4:sw=4:et
#
# Author: Hari Sekhon
# Date: 2016-05-23 17:49:21 +0100 (Mon, 23 May 2016)
#
# https://github.com/harisekhon/nagios-plugins
#
# License: see accompanying Hari Sekhon LICENSE file
#
# If you're using my code you're welcome to connect with me on LinkedIn
# and optionally send me feedback to help steer this or other code I publish
#
# https://www.linkedin.com/in/harisekhon
#
"""
Nagios Plugin to check the deployed version of Nginx matches what's expected.
This is also used in the accompanying test suite to ensure we're checking the right version of Nginx
for compatibility for all my other Nginx nagios plugins.
Tested on Nginx 1.9.11, 1.10.0, 1.11.0
"""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
#from __future__ import unicode_literals
import logging
import os
import re
import sys
import traceback
try:
from bs4 import BeautifulSoup
import requests
except ImportError:
print(traceback.format_exc(), end='')
sys.exit(4)
srcdir = os.path.abspath(os.path.dirname(__file__))
libdir = os.path.join(srcdir, 'pylib')
sys.path.append(libdir)
try:
# pylint: disable=wrong-import-position
from harisekhon.utils import log, CriticalError, UnknownError, support_msg_api
from harisekhon.utils import validate_host, validate_port, validate_regex, isVersion
from harisekhon import NagiosPlugin
except ImportError as _:
print(traceback.format_exc(), end='')
sys.exit(4)
__author__ = 'Hari Sekhon'
__version__ = '0.1'
class CheckNginxVersion(NagiosPlugin):
def __init__(self):
# Python 2.x
super(CheckNginxVersion, self).__init__()
# Python 3.x
# super().__init__()
self.software = 'Nginx'
self.default_port = 80
self.msg = '{0} version unknown - no message defined'.format(self.software)
def add_options(self):
self.add_hostoption(name="%(software)s" % self.__dict__,
default_host='localhost',
default_port=self.default_port)
self.add_opt('-e', '--expected', help='Expected version regex (optional)')
def run(self):
self.no_args()
host = self.get_opt('host')
port = self.get_opt('port')
validate_host(host)
validate_port(port)
expected = self.get_opt('expected')
if expected is not None:
validate_regex(expected)
log.info('expected version regex: %s', expected)
log.info('querying %s', self.software)
url = 'http://%(host)s:%(port)s/version' % locals()
log.debug('GET %s' % url)
try:
req = requests.get(url)
except requests.exceptions.RequestException as _:
raise CriticalError(_)
log.debug("response: %s %s", req.status_code, req.reason)
log.debug("content:\n%s\n%s\n%s", '='*80, req.content.strip(), '='*80)
# Special handling for Nginx, expecting 404 rather than usual 200
if req.status_code != 404:
raise CriticalError("%s %s (expecting 404)" % (req.status_code, req.reason))
soup = BeautifulSoup(req.content, 'html.parser')
if log.isEnabledFor(logging.DEBUG):
log.debug("BeautifulSoup prettified:\n{0}\n{1}".format(soup.prettify(), '='*80))
try:
version = soup.findAll('center')[1].text
except (AttributeError, TypeError) as _:
raise UnknownError('failed to find parse {0} output. {1}\n{2}'.
format(self.software, support_msg_api(), traceback.format_exc()))
if '/' in version:
version = version.split('/')[1]
if not version:
raise UnknownError('{0} version not found in output. {1}'.format(self.software, support_msg_api()))
if not isVersion(version):
raise UnknownError('{0} version unrecognized \'{1}\'. {2}'.
format(self.software, version, support_msg_api()))
self.ok()
self.msg = '{0} version = {1}'.format(self.software, version)
if expected is not None and not re.search(expected, version):
self.msg += " (expected '{0}')".format(expected)
self.critical()
if __name__ == '__main__':
CheckNginxVersion().main()