plugin.verbose(2, "Checking age of file")
    fileage = time.time() - os.path.getmtime(filename)
    if fileage > plugin.options.maxage:
        returncode = 3
        plugin.add_output('Data of sensor "%s" to old' % sensorid)
        plugin.add_multilineoutput(
            "%s %s because of file age: %s, limit: %s"
            % (
                sensorid,
                plugin.RETURNSTRINGS[returncode],
                plugin.seconds_to_timedelta(fileage),
                plugin.seconds_to_timedelta(plugin.options.maxage),
            )
        )
        plugin.add_returncode(returncode)
        plugin.verbose(2, "File to old, age: %s but only %s seconds allowed" % (long(fileage), plugin.options.maxage))
    else:
        plugin.verbose(2, "File age OK, age: %s and %s seconds are allowed" % (long(fileage), plugin.options.maxage))

        valuesinfile = 0

        for line in data:
            result = searchpattern.search(line)
            if result:
                sensor_type = None
                (readtime, sid, raw, value, unit) = result.groups()

                readtime = datetime.datetime.fromtimestamp(long(readtime))
                readtime = readtime.isoformat(" ")
if not ',' in plugin.options.dns:
	# Only one DNS object
	try:
		ip_dns = socket.gethostbyname(plugin.options.dns)
	except socket.gaierror:
		ip_dns = None
		plugin.back2nagios(1, 'Could not find "%s" in DNS!' % plugin.options.dns)

	if ip_iface == ip_dns:
		plugin.back2nagios(0, 'Found %s for "%s" in DNS and on interface "%s"' % (ip_dns, plugin.options.dns, plugin.options.iface))
	else:
		plugin.back2nagios(2, 'Found %s for "%s" in DNS, but %s for interface "%s"' % (ip_dns, plugin.options.dns, ip_iface, plugin.options.iface))

else:
	# Multiple DNS objects
	plugin.add_returncode(0)
	failed_dns = []

	for dns in plugin.options.dns.split(','):
		try:
			ip_dns = socket.gethostbyname(dns)
		except socket.gaierror:
			ip_dns = None

		if ip_dns:
			plugin.verbose(1, 'Found IP "%s" as DNS object "%s"' % (ip_dns, dns))
		else:
			plugin.verbose(1, 'Did not find IP for "%s"' % dns)

		if ip_iface != ip_dns:
			plugin.add_multilineoutput('CRITICAL - "%s" has unexpected IP "%s"' % (dns, ip_dns))