474 lines
16 KiB
Python
474 lines
16 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2012 OpenStack Foundation
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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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import abc
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import os
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import re
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import shutil
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import socket
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import StringIO
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import sys
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import netaddr
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from oslo.config import cfg
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from quantum.agent.linux import ip_lib
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from quantum.agent.linux import utils
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from quantum.openstack.common import jsonutils
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from quantum.openstack.common import log as logging
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from quantum.openstack.common import uuidutils
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LOG = logging.getLogger(__name__)
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OPTS = [
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cfg.StrOpt('dhcp_confs',
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default='$state_path/dhcp',
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help=_('Location to store DHCP server config files')),
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cfg.IntOpt('dhcp_lease_time',
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default=120,
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help=_('Lifetime of a DHCP lease in seconds')),
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cfg.StrOpt('dhcp_domain',
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default='openstacklocal',
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help=_('Domain to use for building the hostnames')),
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cfg.StrOpt('dnsmasq_config_file',
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default='',
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help=_('Override the default dnsmasq settings with this file')),
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cfg.StrOpt('dnsmasq_dns_server',
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help=_('Use another DNS server before any in '
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'/etc/resolv.conf.')),
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]
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IPV4 = 4
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IPV6 = 6
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UDP = 'udp'
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TCP = 'tcp'
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DNS_PORT = 53
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DHCPV4_PORT = 67
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DHCPV6_PORT = 467
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METADATA_DEFAULT_IP = '169.254.169.254'
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class DhcpBase(object):
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__metaclass__ = abc.ABCMeta
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def __init__(self, conf, network, root_helper='sudo',
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device_delegate=None, namespace=None, version=None):
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self.conf = conf
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self.network = network
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self.root_helper = root_helper
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self.device_delegate = device_delegate
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self.namespace = namespace
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self.version = version
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@abc.abstractmethod
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def enable(self):
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"""Enables DHCP for this network."""
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@abc.abstractmethod
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def disable(self, retain_port=False):
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"""Disable dhcp for this network."""
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def restart(self):
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"""Restart the dhcp service for the network."""
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self.disable(retain_port=True)
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self.enable()
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@abc.abstractproperty
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def active(self):
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"""Boolean representing the running state of the DHCP server."""
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@abc.abstractmethod
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def reload_allocations(self):
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"""Force the DHCP server to reload the assignment database."""
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@classmethod
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def existing_dhcp_networks(cls, conf, root_helper):
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"""Return a list of existing networks ids (ones we have configs for)"""
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raise NotImplementedError
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@classmethod
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def check_version(cls):
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"""Execute version checks on DHCP server."""
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raise NotImplementedError
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class DhcpLocalProcess(DhcpBase):
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PORTS = []
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def _enable_dhcp(self):
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"""check if there is a subnet within the network with dhcp enabled."""
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for subnet in self.network.subnets:
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if subnet.enable_dhcp:
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return True
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return False
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def enable(self):
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"""Enables DHCP for this network by spawning a local process."""
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interface_name = self.device_delegate.setup(self.network,
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reuse_existing=True)
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if self.active:
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self.restart()
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elif self._enable_dhcp():
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self.interface_name = interface_name
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self.spawn_process()
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def disable(self, retain_port=False):
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"""Disable DHCP for this network by killing the local process."""
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pid = self.pid
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if self.active:
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cmd = ['kill', '-9', pid]
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if self.namespace:
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ip_wrapper = ip_lib.IPWrapper(self.root_helper, self.namespace)
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ip_wrapper.netns.execute(cmd)
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else:
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utils.execute(cmd, self.root_helper)
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if not retain_port:
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self.device_delegate.destroy(self.network, self.interface_name)
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elif pid:
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LOG.debug(_('DHCP for %(net_id)s pid %(pid)d is stale, ignoring '
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'command'), {'net_id': self.network.id, 'pid': pid})
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else:
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LOG.debug(_('No DHCP started for %s'), self.network.id)
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self._remove_config_files()
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def _remove_config_files(self):
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confs_dir = os.path.abspath(os.path.normpath(self.conf.dhcp_confs))
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conf_dir = os.path.join(confs_dir, self.network.id)
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shutil.rmtree(conf_dir, ignore_errors=True)
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def get_conf_file_name(self, kind, ensure_conf_dir=False):
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"""Returns the file name for a given kind of config file."""
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confs_dir = os.path.abspath(os.path.normpath(self.conf.dhcp_confs))
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conf_dir = os.path.join(confs_dir, self.network.id)
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if ensure_conf_dir:
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if not os.path.isdir(conf_dir):
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os.makedirs(conf_dir, 0755)
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return os.path.join(conf_dir, kind)
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def _get_value_from_conf_file(self, kind, converter=None):
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"""A helper function to read a value from one of the state files."""
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file_name = self.get_conf_file_name(kind)
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msg = _('Error while reading %s')
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try:
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with open(file_name, 'r') as f:
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try:
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return converter and converter(f.read()) or f.read()
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except ValueError, e:
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msg = _('Unable to convert value in %s')
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except IOError, e:
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msg = _('Unable to access %s')
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LOG.debug(msg % file_name)
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return None
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@property
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def pid(self):
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"""Last known pid for the DHCP process spawned for this network."""
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return self._get_value_from_conf_file('pid', int)
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@property
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def active(self):
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pid = self.pid
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if pid is None:
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return False
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cmd = ['cat', '/proc/%s/cmdline' % pid]
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try:
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return self.network.id in utils.execute(cmd, self.root_helper)
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except RuntimeError, e:
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return False
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@property
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def interface_name(self):
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return self._get_value_from_conf_file('interface')
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@interface_name.setter
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def interface_name(self, value):
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interface_file_path = self.get_conf_file_name('interface',
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ensure_conf_dir=True)
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utils.replace_file(interface_file_path, value)
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@abc.abstractmethod
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def spawn_process(self):
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pass
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class Dnsmasq(DhcpLocalProcess):
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# The ports that need to be opened when security policies are active
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# on the Quantum port used for DHCP. These are provided as a convenience
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# for users of this class.
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PORTS = {IPV4: [(UDP, DNS_PORT), (TCP, DNS_PORT), (UDP, DHCPV4_PORT)],
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IPV6: [(UDP, DNS_PORT), (TCP, DNS_PORT), (UDP, DHCPV6_PORT)],
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}
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_TAG_PREFIX = 'tag%d'
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QUANTUM_NETWORK_ID_KEY = 'QUANTUM_NETWORK_ID'
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QUANTUM_RELAY_SOCKET_PATH_KEY = 'QUANTUM_RELAY_SOCKET_PATH'
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MINIMUM_VERSION = 2.59
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@classmethod
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def check_version(cls):
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ver = 0
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try:
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cmd = ['dnsmasq', '--version']
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out = utils.execute(cmd)
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ver = re.findall("\d+.\d+", out)[0]
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is_valid_version = float(ver) >= cls.MINIMUM_VERSION
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if not is_valid_version:
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LOG.warning(_('FAILED VERSION REQUIREMENT FOR DNSMASQ. '
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'DHCP AGENT MAY NOT RUN CORRECTLY! '
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'Please ensure that its version is %s '
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'or above!'), cls.MINIMUM_VERSION)
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except (OSError, RuntimeError, IndexError, ValueError):
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LOG.warning(_('Unable to determine dnsmasq version. '
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'Please ensure that its version is %s '
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'or above!'), cls.MINIMUM_VERSION)
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return float(ver)
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@classmethod
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def existing_dhcp_networks(cls, conf, root_helper):
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"""Return a list of existing networks ids (ones we have configs for)"""
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confs_dir = os.path.abspath(os.path.normpath(conf.dhcp_confs))
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class FakeNetwork:
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def __init__(self, net_id):
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self.id = net_id
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return [
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c for c in os.listdir(confs_dir)
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if (uuidutils.is_uuid_like(c) and
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cls(conf, FakeNetwork(c), root_helper).active)
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]
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def spawn_process(self):
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"""Spawns a Dnsmasq process for the network."""
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env = {
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self.QUANTUM_NETWORK_ID_KEY: self.network.id,
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self.QUANTUM_RELAY_SOCKET_PATH_KEY:
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self.conf.dhcp_lease_relay_socket
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}
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cmd = [
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'dnsmasq',
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'--no-hosts',
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'--no-resolv',
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'--strict-order',
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'--bind-interfaces',
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'--interface=%s' % self.interface_name,
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'--except-interface=lo',
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'--pid-file=%s' % self.get_conf_file_name(
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'pid', ensure_conf_dir=True),
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#TODO (mark): calculate value from cidr (defaults to 150)
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#'--dhcp-lease-max=%s' % ?,
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'--dhcp-hostsfile=%s' % self._output_hosts_file(),
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'--dhcp-optsfile=%s' % self._output_opts_file(),
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'--dhcp-script=%s' % self._lease_relay_script_path(),
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'--leasefile-ro',
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]
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for i, subnet in enumerate(self.network.subnets):
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# if a subnet is specified to have dhcp disabled
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if not subnet.enable_dhcp:
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continue
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if subnet.ip_version == 4:
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mode = 'static'
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else:
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# TODO (mark): how do we indicate other options
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# ra-only, slaac, ra-nameservers, and ra-stateless.
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mode = 'static'
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if self.version >= self.MINIMUM_VERSION:
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set_tag = 'set:'
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else:
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set_tag = ''
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cmd.append('--dhcp-range=%s%s,%s,%s,%ss' %
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(set_tag, self._TAG_PREFIX % i,
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netaddr.IPNetwork(subnet.cidr).network,
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mode,
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self.conf.dhcp_lease_time))
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cmd.append('--conf-file=%s' % self.conf.dnsmasq_config_file)
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if self.conf.dnsmasq_dns_server:
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cmd.append('--server=%s' % self.conf.dnsmasq_dns_server)
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if self.conf.dhcp_domain:
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cmd.append('--domain=%s' % self.conf.dhcp_domain)
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if self.namespace:
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ip_wrapper = ip_lib.IPWrapper(self.root_helper, self.namespace)
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ip_wrapper.netns.execute(cmd, addl_env=env)
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else:
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# For normal sudo prepend the env vars before command
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cmd = ['%s=%s' % pair for pair in env.items()] + cmd
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utils.execute(cmd, self.root_helper)
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def reload_allocations(self):
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"""Rebuild the dnsmasq config and signal the dnsmasq to reload."""
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# If all subnets turn off dhcp, kill the process.
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if not self._enable_dhcp():
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self.disable()
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LOG.debug(_('Killing dhcpmasq for network since all subnets have '
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'turned off DHCP: %s'), self.network.id)
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return
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self._output_hosts_file()
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self._output_opts_file()
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if self.active:
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cmd = ['kill', '-HUP', self.pid]
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if self.namespace:
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ip_wrapper = ip_lib.IPWrapper(self.root_helper, self.namespace)
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ip_wrapper.netns.execute(cmd)
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else:
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utils.execute(cmd, self.root_helper)
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else:
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LOG.debug(_('Pid %d is stale, relaunching dnsmasq'), self.pid)
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LOG.debug(_('Reloading allocations for network: %s'), self.network.id)
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def _output_hosts_file(self):
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"""Writes a dnsmasq compatible hosts file."""
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r = re.compile('[:.]')
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buf = StringIO.StringIO()
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for port in self.network.ports:
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for alloc in port.fixed_ips:
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name = '%s.%s' % (r.sub('-', alloc.ip_address),
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self.conf.dhcp_domain)
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buf.write('%s,%s,%s\n' %
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(port.mac_address, name, alloc.ip_address))
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name = self.get_conf_file_name('host')
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utils.replace_file(name, buf.getvalue())
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return name
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def _output_opts_file(self):
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"""Write a dnsmasq compatible options file."""
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if self.conf.enable_isolated_metadata:
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subnet_to_interface_ip = self._make_subnet_interface_ip_map()
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options = []
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for i, subnet in enumerate(self.network.subnets):
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if not subnet.enable_dhcp:
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continue
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if subnet.dns_nameservers:
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options.append(
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self._format_option(i, 'dns-server',
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','.join(subnet.dns_nameservers)))
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host_routes = ["%s,%s" % (hr.destination, hr.nexthop)
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for hr in subnet.host_routes]
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# Add host routes for isolated network segments
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enable_metadata = (
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self.conf.enable_isolated_metadata
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and not subnet.gateway_ip
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and subnet.ip_version == 4)
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if enable_metadata:
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subnet_dhcp_ip = subnet_to_interface_ip[subnet.id]
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host_routes.append(
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'%s/32,%s' % (METADATA_DEFAULT_IP, subnet_dhcp_ip)
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)
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if host_routes:
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options.append(
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self._format_option(i, 'classless-static-route',
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','.join(host_routes)))
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if subnet.ip_version == 4:
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if subnet.gateway_ip:
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options.append(self._format_option(i, 'router',
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subnet.gateway_ip))
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else:
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options.append(self._format_option(i, 'router'))
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name = self.get_conf_file_name('opts')
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utils.replace_file(name, '\n'.join(options))
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return name
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def _make_subnet_interface_ip_map(self):
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ip_dev = ip_lib.IPDevice(
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self.interface_name,
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self.root_helper,
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self.namespace
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)
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subnet_lookup = dict(
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(netaddr.IPNetwork(subnet.cidr), subnet.id)
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for subnet in self.network.subnets
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)
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retval = {}
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for addr in ip_dev.addr.list():
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ip_net = netaddr.IPNetwork(addr['cidr'])
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if ip_net in subnet_lookup:
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retval[subnet_lookup[ip_net]] = addr['cidr'].split('/')[0]
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return retval
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def _lease_relay_script_path(self):
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return os.path.join(os.path.dirname(sys.argv[0]),
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'quantum-dhcp-agent-dnsmasq-lease-update')
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def _format_option(self, index, option_name, *args):
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if self.version >= self.MINIMUM_VERSION:
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set_tag = 'tag:'
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else:
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set_tag = ''
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return ','.join((set_tag + self._TAG_PREFIX % index,
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'option:%s' % option_name) + args)
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@classmethod
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def lease_update(cls):
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network_id = os.environ.get(cls.QUANTUM_NETWORK_ID_KEY)
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dhcp_relay_socket = os.environ.get(cls.QUANTUM_RELAY_SOCKET_PATH_KEY)
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action = sys.argv[1]
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if action not in ('add', 'del', 'old'):
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sys.exit()
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mac_address = sys.argv[2]
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ip_address = sys.argv[3]
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if action == 'del':
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lease_remaining = 0
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else:
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lease_remaining = int(os.environ.get('DNSMASQ_TIME_REMAINING', 0))
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data = dict(network_id=network_id, mac_address=mac_address,
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ip_address=ip_address, lease_remaining=lease_remaining)
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if os.path.exists(dhcp_relay_socket):
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sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
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sock.connect(dhcp_relay_socket)
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sock.send(jsonutils.dumps(data))
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sock.close()
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