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#!/usr/bin/env python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""
Handle lease database updates from DHCP servers.
"""
import gettext
import os
import sys
# If ../nova/__init__.py exists, add ../ to Python search path, so that
# it will override what happens to be installed in /usr/(local/)lib/python...
possible_topdir = os.path.normpath(os.path.join(os.path.abspath(sys.argv[0]),
os.pardir,
os.pardir))
if os.path.exists(os.path.join(possible_topdir, 'nova', '__init__.py')):
sys.path.insert(0, possible_topdir)
gettext.install('nova', unicode=1)
from nova import context
from nova import db
from nova import flags
from nova import log as logging
from nova import rpc
from nova import utils
from nova.network import linux_net
FLAGS = flags.FLAGS
flags.DECLARE('auth_driver', 'nova.auth.manager')
flags.DECLARE('network_size', 'nova.network.manager')
flags.DECLARE('num_networks', 'nova.network.manager')
flags.DECLARE('update_dhcp_on_disassociate', 'nova.network.manager')
flags.DEFINE_string('dnsmasq_interface', 'br0', 'Default Dnsmasq interface')
LOG = logging.getLogger('nova.dhcpbridge')
def add_lease(mac, ip_address, _hostname, _interface):
"""Set the IP that was assigned by the DHCP server."""
if FLAGS.fake_rabbit:
LOG.debug(_("leasing ip"))
network_manager = utils.import_object(FLAGS.network_manager)
network_manager.lease_fixed_ip(context.get_admin_context(),
ip_address)
else:
rpc.cast(context.get_admin_context(),
"%s.%s" % (FLAGS.network_topic, FLAGS.host),
{"method": "lease_fixed_ip",
"args": {"address": ip_address}})
def old_lease(mac, ip_address, hostname, interface):
"""Update just as add lease."""
LOG.debug(_("Adopted old lease or got a change of mac/hostname"))
add_lease(mac, ip_address, hostname, interface)
def del_lease(mac, ip_address, _hostname, _interface):
"""Called when a lease expires."""
if FLAGS.fake_rabbit:
LOG.debug(_("releasing ip"))
network_manager = utils.import_object(FLAGS.network_manager)
network_manager.release_fixed_ip(context.get_admin_context(),
ip_address)
else:
rpc.cast(context.get_admin_context(),
"%s.%s" % (FLAGS.network_topic, FLAGS.host),
{"method": "release_fixed_ip",
"args": {"address": ip_address}})
def init_leases(interface):
"""Get the list of hosts for an interface."""
ctxt = context.get_admin_context()
network_ref = db.network_get_by_bridge(ctxt, interface)
return linux_net.get_dhcp_leases(ctxt, network_ref)
def main():
"""Parse environment and arguments and call the approproate action."""
flagfile = os.environ.get('FLAGFILE', FLAGS.dhcpbridge_flagfile)
utils.default_flagfile(flagfile)
argv = FLAGS(sys.argv)
logging.setup()
# check ENV first so we don't break any older deploys
interface = os.environ.get('DNSMASQ_INTERFACE', FLAGS.dnsmasq_interface)
if int(os.environ.get('TESTING', '0')):
from nova.tests import fake_flags
#if FLAGS.fake_rabbit:
# LOG.debug(_("leasing ip"))
# network_manager = utils.import_object(FLAGS.network_manager)
## reload(fake_flags)
# from nova.tests import fake_flags
action = argv[1]
if action in ['add', 'del', 'old']:
mac = argv[2]
ip = argv[3]
hostname = argv[4]
msg = _("Called %(action)s for mac %(mac)s with ip %(ip)s and"
" hostname %(hostname)s on interface %(interface)s") % locals()
LOG.debug(msg)
globals()[action + '_lease'](mac, ip, hostname, interface)
else:
print init_leases(interface)
if __name__ == "__main__":
main()
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