#!/usr/bin/python3
#
# Univention Monitoring Plugin
#  check_univention_nmbd: check nmbd status
#
# Copyright 2007-2022 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
import subprocess

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


class NMBD(Alert):

	def write_metrics(self):
		ucr_hosts = ucr.get("monitoring/nmbd/query-wins-hosts")
		if ucr_hosts:
			hosts = [ent.strip().split(' ', 1) for ent in ucr_hosts.split(',')]
		else:
			query_host = wins_host = subprocess.check_output('/bin/hostname').decode('UTF-8')
			hosts = [(query_host, wins_host)]

		for query_host, wins_host in hosts:
			try:
				output = subprocess.check_output(['/usr/bin/nmblookup', '-U', wins_host, '-R', query_host], stderr=subprocess.DEVNULL).decode('UTF-8', 'replace')
			except FileNotFoundError:
				self.write_metric('univention_nmbd_running', -1, query_host=query_host, wins_host=wins_host)
				self.log.debug('Cannot find nmblookup executable')
				return
			except subprocess.CalledProcessError as exc:
				output = exc.output.decode('UTF-8', 'replace')

			output = output.replace('\n', ';')
			if 'failed to find name' in output:
				self.log.debug('nmblookup for %s at host %s failed: %s' % (wins_host, query_host, output))
				self.write_metric('univention_nmbd_running', 0, query_host=query_host, wins_host=wins_host)

			if re.search('[0-9]+.[0-9]+.[0-9]+.[0-9]+ %s' % (re.escape(query_host),), output):
				self.log.debug('nmblookup for %s at host %s ok' % (wins_host, query_host))
				self.write_metric('univention_nmbd_running', 1, query_host=query_host, wins_host=wins_host)
			else:
				self.log.debug('unknown nmblookup for %s at host %s: %s' % (wins_host, query_host, output))
				self.write_metric('univention_nmbd_running', 0, query_host=query_host, wins_host=wins_host)


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