diff options
Diffstat (limited to 'collectors/python.d.plugin/isc_dhcpd/isc_dhcpd.chart.py')
| -rw-r--r-- | collectors/python.d.plugin/isc_dhcpd/isc_dhcpd.chart.py | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/collectors/python.d.plugin/isc_dhcpd/isc_dhcpd.chart.py b/collectors/python.d.plugin/isc_dhcpd/isc_dhcpd.chart.py new file mode 100644 index 0000000..bbe7a93 --- /dev/null +++ b/collectors/python.d.plugin/isc_dhcpd/isc_dhcpd.chart.py @@ -0,0 +1,207 @@ +# -*- coding: utf-8 -*- +# Description: isc dhcpd lease netdata python.d module +# Author: l2isbad +# SPDX-License-Identifier: GPL-3.0-or-later + +import os +import re +import time + + +try: + import ipaddress + HAVE_IP_ADDRESS = True +except ImportError: + HAVE_IP_ADDRESS = False + +from collections import defaultdict +from copy import deepcopy + +from bases.FrameworkServices.SimpleService import SimpleService + + +ORDER = [ + 'pools_utilization', + 'pools_active_leases', + 'leases_total', +] + +CHARTS = { + 'pools_utilization': { + 'options': [None, 'Pools Utilization', 'percentage', 'utilization', 'isc_dhcpd.utilization', 'line'], + 'lines': [] + }, + 'pools_active_leases': { + 'options': [None, 'Active Leases Per Pool', 'leases', 'active leases', 'isc_dhcpd.active_leases', 'line'], + 'lines': [] + }, + 'leases_total': { + 'options': [None, 'All Active Leases', 'leases', 'active leases', 'isc_dhcpd.leases_total', 'line'], + 'lines': [ + ['leases_total', 'leases', 'absolute'] + ], + 'variables': [ + ['leases_size'] + ] + } +} + + +class DhcpdLeasesFile: + def __init__(self, path): + self.path = path + self.mod_time = 0 + self.size = 0 + + def is_valid(self): + return os.path.isfile(self.path) and os.access(self.path, os.R_OK) + + def is_changed(self): + mod_time = os.path.getmtime(self.path) + if mod_time != self.mod_time: + self.mod_time = mod_time + self.size = int(os.path.getsize(self.path) / 1024) + return True + return False + + def get_data(self): + try: + with open(self.path) as leases: + result = defaultdict(dict) + for row in leases: + row = row.strip() + if row.startswith('lease'): + address = row[6:-2] + elif row.startswith('iaaddr'): + address = row[7:-2] + elif row.startswith('ends'): + result[address]['ends'] = row[5:-1] + elif row.startswith('binding state'): + result[address]['state'] = row[14:-1] + return dict((k, v) for k, v in result.items() if len(v) == 2) + except (OSError, IOError): + return None + + +class Pool: + def __init__(self, name, network): + self.id = re.sub(r'[:/.-]+', '_', name) + self.name = name + self.network = ipaddress.ip_network(address=u'%s' % network) + + def num_hosts(self): + return self.network.num_addresses - 2 + + def __contains__(self, item): + return item.address in self.network + + +class Lease: + def __init__(self, address, ends, state): + self.address = ipaddress.ip_address(address=u'%s' % address) + self.ends = ends + self.state = state + + def is_active(self, current_time): + # lease_end_time might be epoch + if self.ends.startswith('epoch'): + epoch = int(self.ends.split()[1].replace(';', '')) + return epoch - current_time > 0 + # max. int for lease-time causes lease to expire in year 2038. + # dhcpd puts 'never' in the ends section of active lease + elif self.ends == 'never': + return True + return time.mktime(time.strptime(self.ends, '%w %Y/%m/%d %H:%M:%S')) - current_time > 0 + + def is_valid(self): + return self.state == 'active' + + +class Service(SimpleService): + def __init__(self, configuration=None, name=None): + SimpleService.__init__(self, configuration=configuration, name=name) + self.order = ORDER + self.definitions = deepcopy(CHARTS) + lease_path = self.configuration.get('leases_path', '/var/lib/dhcp/dhcpd.leases') + self.dhcpd_leases = DhcpdLeasesFile(path=lease_path) + self.pools = list() + self.data = dict() + + # Will work only with 'default' db-time-format (weekday year/month/day hour:minute:second) + # TODO: update algorithm to parse correctly 'local' db-time-format + + def check(self): + if not HAVE_IP_ADDRESS: + self.error("'python-ipaddress' package is needed") + return False + + if not self.dhcpd_leases.is_valid(): + self.error("Make sure '{path}' is exist and readable by netdata".format(path=self.dhcpd_leases.path)) + return False + + pools = self.configuration.get('pools') + if not pools: + self.error('Pools are not defined') + return False + + for pool in pools: + try: + new_pool = Pool(name=pool, network=pools[pool]) + except ValueError as error: + self.error("'{pool}' was removed, error: {error}".format(pool=pools[pool], error=error)) + else: + self.pools.append(new_pool) + + self.create_charts() + return bool(self.pools) + + def get_data(self): + """ + :return: dict + """ + if not self.dhcpd_leases.is_changed(): + return self.data + + raw_leases = self.dhcpd_leases.get_data() + if not raw_leases: + self.data = dict() + return None + + active_leases = list() + current_time = time.mktime(time.gmtime()) + + for address in raw_leases: + try: + new_lease = Lease(address, **raw_leases[address]) + except ValueError: + continue + else: + if new_lease.is_active(current_time) and new_lease.is_valid(): + active_leases.append(new_lease) + + for pool in self.pools: + count = len([ip for ip in active_leases if ip in pool]) + self.data[pool.id + '_active_leases'] = count + self.data[pool.id + '_utilization'] = float(count) / pool.num_hosts() * 10000 + + self.data['leases_size'] = self.dhcpd_leases.size + self.data['leases_total'] = len(active_leases) + + return self.data + + def create_charts(self): + for pool in self.pools: + dim = [ + pool.id + '_utilization', + pool.name, + 'absolute', + 1, + 100, + ] + self.definitions['pools_utilization']['lines'].append(dim) + + dim = [ + pool.id + '_active_leases', + pool.name, + ] + self.definitions['pools_active_leases']['lines'].append(dim) |