#!/usr/local/bin/python2.7 """ Copyright (c) 2016 Ad Schellevis All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -------------------------------------------------------------------------------------- watch dhcp lease file and build include file for unbound """ import os import sys sys.path.insert(0, "/usr/local/opnsense/site-python") import subprocess import time import tempfile from daemonize import Daemonize import watchers.dhcpd import params def unbound_control(commands, output_stream=None): """ execute (chrooted) unbound-control command :param commands: command list (parameters) :param output_stream: (optional)output stream :return: None """ output_stream = open(os.devnull, 'w') subprocess.check_call(['/usr/sbin/chroot', '-u', 'unbound', '-g', 'unbound', '/', '/usr/local/sbin/unbound-control', '-c', '/var/unbound/unbound.conf'] + commands, stdout=output_stream, stderr=subprocess.STDOUT) output_stream.seek(0) def unbound_known_addresses(): """ fetch known addresses :return: list """ result = list() with tempfile.NamedTemporaryFile() as output_stream: unbound_control(['list_local_data'], output_stream) for line in output_stream.read().split('\n'): parts = line.split() if len(parts) > 4 and parts[3] == 'A': result.append(parts[4]) return result # parse input params app_params = {'pid': '/var/run/unbound_dhcpd.pid', 'domain': 'local', 'target': '/var/unbound/dhcpleases.conf', 'background': '1'} params.update_params(app_params) def main(): # cleanup interval (seconds) cleanup_interval = 60 # initiate lease watcher and setup cache dhcpdleases = watchers.dhcpd.DHCPDLease() cached_leases = dict() known_addresses = unbound_known_addresses() # start watching dhcp leases last_cleanup = time.time() while True: dhcpd_changed = False for lease in dhcpdleases.watch(): if 'ends' in lease and lease['ends'] > time.time() and 'client-hostname' in lease and 'address' in lease: cached_leases[lease['address']] = lease dhcpd_changed = True if time.time() - last_cleanup > cleanup_interval: # cleanup every x seconds last_cleanup = time.time() addresses = cached_leases.keys() for address in addresses: if cached_leases[address]['ends'] < time.time(): del cached_leases[address] dhcpd_changed = True if dhcpd_changed: # dump dns output to target with open(app_params['target'], 'w') as unbound_conf: for address in cached_leases: unbound_conf.write('local-data-ptr: "%s %s.%s"\n' % (address, cached_leases[address]['client-hostname'], app_params['domain'])) unbound_conf.write('local-data: "%s.%s IN A %s"\n' % (cached_leases[address]['client-hostname'], app_params['domain'], address)) # signal unbound for address in cached_leases: if address not in known_addresses: fqdn = '%s.%s' % (cached_leases[address]['client-hostname'], app_params['domain']) unbound_control(['local_data', address, 'PTR', fqdn]) unbound_control(['local_data', fqdn, 'IN A', address]) known_addresses.append(address) # wait for next cycle time.sleep(1) # startup if app_params['background'] == '1': daemon = Daemonize(app="unbound_dhcpd", pid=app_params['pid'], action=main) daemon.start() else: main()