#!/usr/bin/python3
#
# Univention Monitoring Plugin
#
# Copyright 2010-2022 Univention GmbH
#
# https://www.univention.de/
#
# All rights reserved.
#
# The source code of this program is made available
# under the terms of the GNU Affero General Public License version 3
# (GNU AGPL V3) as published by the Free Software Foundation.
#
# Binary versions of this program provided by Univention to you as
# well as other copyrighted, protected or trademarked materials like
# Logos, graphics, fonts, specific documentations and configurations,
# cryptographic keys etc. are subject to a license agreement between
# you and Univention and not subject to the GNU AGPL V3.
#
# In the case you use this program under the terms of the GNU AGPL V3,
# the program is provided in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public
# License with the Debian GNU/Linux or Univention distribution in file
# /usr/share/common-licenses/AGPL-3; if not, see
# <https://www.gnu.org/licenses/>.

import re

from univention.config_registry import ucr
from univention.monitoring import Alert


class Squid(Alert):

	def write_metrics(self):
		# check for at least one squid process
		rc, output = self.exec_command(['/usr/lib/nagios/plugins/check_procs', '-w', '1:', '-c', '1:', '-C', 'squid'])
		self.write_metric('univention_squid_running', 1 if rc == 0 else 0)
		self.log.debug(output)

		# check HTTP service
		port = '3128'
		try:
			with open('/etc/squid/squid.conf') as fd:
				while True:
					line = fd.readline()
					if not line:
						break
					match = re.match(r'^\s*http_port\s+(\d+)', line)
					if match:
						port = match.group(1)
						break
		except FileNotFoundError:
			pass

		# check if authentication is required
		auth = []
		for authtype in ('squid/ntlmauth', 'squid/basicauth', 'squid/krb5auth'):
			if ucr.is_true(authtype):
				auth.extend(['-e', '407'])
				break

		rc, output = self.exec_command(['/usr/lib/nagios/plugins/check_http', '-I', '127.0.0.1', '-p', port, '-u', 'http://127.0.0.1'] + auth)
		self.write_metric('univention_squid_reachable', 1 if rc == 0 else 0)
		self.log.debug(output)


if __name__ == '__main__':
	Squid.main()
