~justin-fathomdb/nova/bug744150

#!/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 logging

import os

import sys

#TODO(joshua): there is concern that the user dnsmasq runs under will not

#              have nova in the path. This should be verified and if it is

#              not true the ugly line below can be removed

sys.path.append(os.path.abspath(os.path.join(__file__, "../../")))

from nova import flags

from nova import rpc

from nova import utils

from nova.network import linux_net

from nova.network import model

from nova.network import service

FLAGS = flags.FLAGS

def add_lease(_mac, ip, _hostname, _interface):

    """Set the IP that was assigned by the DHCP server."""

    if FLAGS.fake_rabbit:

        service.VlanNetworkService().lease_ip(ip)

    else:

        rpc.cast("%s.%s" % (FLAGS.network_topic, FLAGS.node_name),

                 {"method": "lease_ip",

                  "args": {"fixed_ip": ip}})

def old_lease(_mac, _ip, _hostname, _interface):

    """Do nothing, just an old lease update."""

    logging.debug("Adopted old lease or got a change of mac/hostname")

def del_lease(_mac, ip, _hostname, _interface):

    """Remove the leased IP from the databases."""

    if FLAGS.fake_rabbit:

        service.VlanNetworkService().release_ip(ip)

    else:

        rpc.cast("%s.%s" % (FLAGS.network_topic, FLAGS.node_name),

                 {"method": "release_ip",

                  "args": {"fixed_ip": ip}})

def init_leases(interface):

    """Get the list of hosts for an interface."""

    net = model.get_network_by_interface(interface)

    res = ""

    for host_name in net.hosts:

        res += "%s\n" % linux_net.hostDHCP(net, host_name,

                                           net.hosts[host_name])

    return res

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)

    interface = os.environ.get('DNSMASQ_INTERFACE', 'br0')

    if int(os.environ.get('TESTING', '0')):

        FLAGS.fake_rabbit = True

        FLAGS.redis_db = 8

        FLAGS.network_size = 32

        FLAGS.connection_type = 'fake'

        FLAGS.fake_network = True

        FLAGS.auth_driver = 'nova.auth.ldapdriver.FakeLdapDriver'

    action = argv[1]

    if action in ['add', 'del', 'old']:

        mac = argv[2]

        ip = argv[3]

        hostname = argv[4]

        logging.debug("Called %s for mac %s with ip %s and "

                      "hostname %s on interface %s",

                      action, mac, ip, hostname, interface)

        globals()[action + '_lease'](mac, ip, hostname, interface)

    else:

        print init_leases(interface)

if __name__ == "__main__":

    main()