#!/usr/bin/python3
#
# Univention Monitoring Plugin
#  check_univention_nmbd: check nmbd status
#
# SPDX-FileCopyrightText: 2007-2025 Univention GmbH
# SPDX-License-Identifier: AGPL-3.0-only

import re
import shlex
import subprocess

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


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').strip().decode('UTF-8')
            hosts = [(query_host, wins_host)]

        for query_host, wins_host in hosts:
            cmd = ['/usr/bin/nmblookup', '-U', wins_host, '--recursion', query_host]
            try:
                output = subprocess.check_output(cmd, 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')
                continue
            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): %s', wins_host, query_host, ' '.join(shlex.quote(x) for x in cmd), output)
                self.write_metric('univention_nmbd_running', 0, query_host=query_host, wins_host=wins_host)
                continue

            # FIXME: IPv6 possible?
            if re.search(r'[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()
