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