/
dns_integration.py
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/
dns_integration.py
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# Copyright (c) 2016 IBM
# 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.
from neutron_lib.api import validators
from neutron_lib.callbacks import events
from neutron_lib.callbacks import registry
from neutron_lib.callbacks import resources
from neutron_lib.plugins import directory
from oslo_config import cfg
from oslo_log import log as logging
from neutron._i18n import _LE, _LI
from neutron.db import models_v2
from neutron.db import segments_db
from neutron.extensions import dns
from neutron.objects import network as net_obj
from neutron.objects import ports as port_obj
from neutron.plugins.common import utils as plugin_utils
from neutron.plugins.ml2 import driver_api as api
from neutron.services.externaldns import driver
LOG = logging.getLogger(__name__)
DNS_DOMAIN_DEFAULT = 'openstacklocal.'
class DNSExtensionDriver(api.ExtensionDriver):
_supported_extension_alias = 'dns-integration'
@property
def extension_alias(self):
return self._supported_extension_alias
def process_create_network(self, plugin_context, request_data, db_data):
dns_domain = request_data.get(dns.DNSDOMAIN)
if not validators.is_attr_set(dns_domain):
return
if dns_domain:
net_obj.NetworkDNSDomain(plugin_context,
network_id=db_data['id'],
dns_domain=dns_domain).create()
db_data[dns.DNSDOMAIN] = dns_domain
def process_update_network(self, plugin_context, request_data, db_data):
new_value = request_data.get(dns.DNSDOMAIN)
if not validators.is_attr_set(new_value):
return
current_dns_domain = db_data.get(dns.DNSDOMAIN)
if current_dns_domain == new_value:
return
net_id = db_data['id']
if current_dns_domain:
net_dns_domain = net_obj.NetworkDNSDomain.get_object(
plugin_context,
network_id=net_id)
if new_value:
net_dns_domain['dns_domain'] = new_value
db_data[dns.DNSDOMAIN] = new_value
net_dns_domain.update()
else:
net_dns_domain.delete()
db_data[dns.DNSDOMAIN] = ''
elif new_value:
net_obj.NetworkDNSDomain(plugin_context,
network_id=net_id,
dns_domain=new_value).create()
db_data[dns.DNSDOMAIN] = new_value
def process_create_port(self, plugin_context, request_data, db_data):
if not request_data.get(dns.DNSNAME):
return
dns_name, is_dns_domain_default = self._get_request_dns_name(
request_data)
if is_dns_domain_default:
return
network = self._get_network(plugin_context, db_data['network_id'])
if self.external_dns_not_needed(
plugin_context, network) or not network[dns.DNSDOMAIN]:
current_dns_name = ''
current_dns_domain = ''
else:
current_dns_name = dns_name
current_dns_domain = network[dns.DNSDOMAIN]
port_obj.PortDNS(plugin_context,
port_id=db_data['id'],
current_dns_name=current_dns_name,
current_dns_domain=current_dns_domain,
previous_dns_name='',
previous_dns_domain='',
dns_name=dns_name).create()
def _update_dns_db(self, dns_name, dns_domain, db_data,
plugin_context, has_fixed_ips):
dns_data_db = port_obj.PortDNS.get_object(
plugin_context,
port_id=db_data['id'])
if dns_data_db:
is_dns_name_changed = (dns_name is not None and
dns_data_db['current_dns_name'] != dns_name)
if is_dns_name_changed or (has_fixed_ips and
dns_data_db['current_dns_name']):
dns_data_db['previous_dns_name'] = (
dns_data_db['current_dns_name'])
dns_data_db['previous_dns_domain'] = (
dns_data_db['current_dns_domain'])
if is_dns_name_changed:
dns_data_db[dns.DNSNAME] = dns_name
dns_data_db['current_dns_name'] = dns_name
if dns_name:
dns_data_db['current_dns_domain'] = dns_domain
else:
dns_data_db['current_dns_domain'] = ''
dns_data_db.update()
return dns_data_db
if dns_name:
dns_data_db = port_obj.PortDNS(plugin_context,
port_id=db_data['id'],
current_dns_name=dns_name,
current_dns_domain=dns_domain,
previous_dns_name='',
previous_dns_domain='',
dns_name=dns_name)
dns_data_db.create()
return dns_data_db
def process_update_port(self, plugin_context, request_data, db_data):
dns_name = request_data.get(dns.DNSNAME)
has_fixed_ips = 'fixed_ips' in request_data
if dns_name is None and not has_fixed_ips:
return
if dns_name is not None:
dns_name, is_dns_domain_default = self._get_request_dns_name(
request_data)
if is_dns_domain_default:
self._extend_port_dict(plugin_context.session, db_data,
db_data, None)
return
network = self._get_network(plugin_context, db_data['network_id'])
dns_domain = network[dns.DNSDOMAIN]
dns_data_db = None
if not dns_domain or self.external_dns_not_needed(plugin_context,
network):
# No need to update external DNS service. Only process the port's
# dns_name attribute if necessary
if dns_name is not None:
dns_data_db = self._process_only_dns_name_update(
plugin_context, db_data, dns_name)
else:
dns_data_db = self._update_dns_db(dns_name, dns_domain, db_data,
plugin_context, has_fixed_ips)
self._extend_port_dict(plugin_context.session, db_data, db_data,
dns_data_db)
def _process_only_dns_name_update(self, plugin_context, db_data, dns_name):
dns_data_db = port_obj.PortDNS.get_object(
plugin_context,
port_id=db_data['id'])
if dns_data_db:
dns_data_db['dns_name'] = dns_name
dns_data_db.update()
return dns_data_db
if dns_name:
dns_data_db = port_obj.PortDNS(plugin_context,
port_id=db_data['id'],
current_dns_name='',
current_dns_domain='',
previous_dns_name='',
previous_dns_domain='',
dns_name=dns_name)
dns_data_db.create()
return dns_data_db
def external_dns_not_needed(self, context, network):
"""Decide if ports in network need to be sent to the DNS service.
:param context: plugin request context
:param network: network dictionary
:return: True or False
"""
pass
def extend_network_dict(self, session, db_data, response_data):
response_data[dns.DNSDOMAIN] = ''
if db_data.dns_domain:
response_data[dns.DNSDOMAIN] = db_data.dns_domain[dns.DNSDOMAIN]
return response_data
def _get_dns_domain(self):
if not cfg.CONF.dns_domain:
return ''
if cfg.CONF.dns_domain.endswith('.'):
return cfg.CONF.dns_domain
return '%s.' % cfg.CONF.dns_domain
def _get_request_dns_name(self, port):
dns_domain = self._get_dns_domain()
if ((dns_domain and dns_domain != DNS_DOMAIN_DEFAULT)):
return (port.get(dns.DNSNAME, ''), False)
return ('', True)
def _get_request_dns_name_and_domain_name(self, dns_data_db):
dns_domain = self._get_dns_domain()
dns_name = ''
if ((dns_domain and dns_domain != DNS_DOMAIN_DEFAULT)):
if dns_data_db:
dns_name = dns_data_db.dns_name
return dns_name, dns_domain
def _get_dns_names_for_port(self, ips, dns_data_db):
dns_assignment = []
dns_name, dns_domain = self._get_request_dns_name_and_domain_name(
dns_data_db)
for ip in ips:
if dns_name:
hostname = dns_name
fqdn = dns_name
if not dns_name.endswith('.'):
fqdn = '%s.%s' % (dns_name, dns_domain)
else:
hostname = 'host-%s' % ip['ip_address'].replace(
'.', '-').replace(':', '-')
fqdn = hostname
if dns_domain:
fqdn = '%s.%s' % (hostname, dns_domain)
dns_assignment.append({'ip_address': ip['ip_address'],
'hostname': hostname,
'fqdn': fqdn})
return dns_assignment
def _get_dns_name_for_port_get(self, port, dns_data_db):
if port['fixed_ips']:
return self._get_dns_names_for_port(port['fixed_ips'], dns_data_db)
return []
def _extend_port_dict(self, session, db_data, response_data, dns_data_db):
if not dns_data_db:
response_data[dns.DNSNAME] = ''
else:
response_data[dns.DNSNAME] = dns_data_db[dns.DNSNAME]
response_data['dns_assignment'] = self._get_dns_name_for_port_get(
db_data, dns_data_db)
return response_data
def extend_port_dict(self, session, db_data, response_data):
dns_data_db = db_data.dns
return self._extend_port_dict(session, db_data, response_data,
dns_data_db)
def _get_network(self, context, network_id):
plugin = directory.get_plugin()
return plugin.get_network(context, network_id)
class DNSExtensionDriverML2(DNSExtensionDriver):
def initialize(self):
LOG.info(_LI("DNSExtensionDriverML2 initialization complete"))
def _is_tunnel_tenant_network(self, provider_net):
if provider_net['network_type'] == 'geneve':
tunnel_ranges = cfg.CONF.ml2_type_geneve.vni_ranges
elif provider_net['network_type'] == 'vxlan':
tunnel_ranges = cfg.CONF.ml2_type_vxlan.vni_ranges
else:
tunnel_ranges = cfg.CONF.ml2_type_gre.tunnel_id_ranges
segmentation_id = int(provider_net['segmentation_id'])
for entry in tunnel_ranges:
entry = entry.strip()
tun_min, tun_max = entry.split(':')
tun_min = tun_min.strip()
tun_max = tun_max.strip()
return int(tun_min) <= segmentation_id <= int(tun_max)
def _is_vlan_tenant_network(self, provider_net):
network_vlan_ranges = plugin_utils.parse_network_vlan_ranges(
cfg.CONF.ml2_type_vlan.network_vlan_ranges)
vlan_ranges = network_vlan_ranges[provider_net['physical_network']]
if not vlan_ranges:
return False
segmentation_id = int(provider_net['segmentation_id'])
for vlan_range in vlan_ranges:
if vlan_range[0] <= segmentation_id <= vlan_range[1]:
return True
def external_dns_not_needed(self, context, network):
dns_driver = _get_dns_driver()
if not dns_driver:
return True
if network['router:external']:
return True
segments = segments_db.get_network_segments(context, network['id'])
if len(segments) > 1:
return False
provider_net = segments[0]
if provider_net['network_type'] == 'local':
return True
if provider_net['network_type'] == 'flat':
return False
if provider_net['network_type'] == 'vlan':
return self._is_vlan_tenant_network(provider_net)
if provider_net['network_type'] in ['gre', 'vxlan', 'geneve']:
return self._is_tunnel_tenant_network(provider_net)
return True
DNS_DRIVER = None
def _get_dns_driver():
global DNS_DRIVER
if DNS_DRIVER:
return DNS_DRIVER
if not cfg.CONF.external_dns_driver:
return
try:
DNS_DRIVER = driver.ExternalDNSService.get_instance()
LOG.debug("External DNS driver loaded: %s",
cfg.CONF.external_dns_driver)
return DNS_DRIVER
except ImportError:
LOG.exception(_LE("ImportError exception occurred while loading "
"the external DNS service driver"))
raise dns.ExternalDNSDriverNotFound(
driver=cfg.CONF.external_dns_driver)
def _create_port_in_external_dns_service(resource, event, trigger, **kwargs):
dns_driver = _get_dns_driver()
if not dns_driver:
return
context = kwargs['context']
port = kwargs['port']
dns_data_db = port_obj.PortDNS.get_object(
context, port_id=port['id'])
if not (dns_data_db and dns_data_db['current_dns_name']):
return
records = [ip['ip_address'] for ip in port['fixed_ips']]
_send_data_to_external_dns_service(context, dns_driver,
dns_data_db['current_dns_domain'],
dns_data_db['current_dns_name'],
records)
def _send_data_to_external_dns_service(context, dns_driver, dns_domain,
dns_name, records):
try:
dns_driver.create_record_set(context, dns_domain, dns_name, records)
except (dns.DNSDomainNotFound, dns.DuplicateRecordSet) as e:
LOG.exception(_LE("Error publishing port data in external DNS "
"service. Name: '%(name)s'. Domain: '%(domain)s'. "
"DNS service driver message '%(message)s'"),
{"name": dns_name,
"domain": dns_domain,
"message": e.msg})
def _remove_data_from_external_dns_service(context, dns_driver, dns_domain,
dns_name, records):
try:
dns_driver.delete_record_set(context, dns_domain, dns_name, records)
except (dns.DNSDomainNotFound, dns.DuplicateRecordSet) as e:
LOG.exception(_LE("Error deleting port data from external DNS "
"service. Name: '%(name)s'. Domain: '%(domain)s'. "
"IP addresses '%(ips)s'. DNS service driver message "
"'%(message)s'"),
{"name": dns_name,
"domain": dns_domain,
"message": e.msg,
"ips": ', '.join(records)})
def _update_port_in_external_dns_service(resource, event, trigger, **kwargs):
dns_driver = _get_dns_driver()
if not dns_driver:
return
context = kwargs['context']
updated_port = kwargs['port']
original_port = kwargs.get('original_port')
if not original_port:
return
original_ips = [ip['ip_address'] for ip in original_port['fixed_ips']]
updated_ips = [ip['ip_address'] for ip in updated_port['fixed_ips']]
if (updated_port[dns.DNSNAME] == original_port[dns.DNSNAME] and
set(original_ips) == set(updated_ips)):
return
if (updated_port[dns.DNSNAME] == original_port[dns.DNSNAME] and
not original_port[dns.DNSNAME]):
return
dns_data_db = port_obj.PortDNS.get_object(
context, port_id=updated_port['id'])
if not (dns_data_db and (dns_data_db['previous_dns_name'] or dns_data_db[
'current_dns_name'])):
return
if dns_data_db['previous_dns_name']:
_remove_data_from_external_dns_service(
context, dns_driver, dns_data_db['previous_dns_domain'],
dns_data_db['previous_dns_name'], original_ips)
if dns_data_db['current_dns_name']:
_send_data_to_external_dns_service(context, dns_driver,
dns_data_db['current_dns_domain'],
dns_data_db['current_dns_name'],
updated_ips)
def _delete_port_in_external_dns_service(resource, event, trigger, **kwargs):
dns_driver = _get_dns_driver()
if not dns_driver:
return
context = kwargs['context']
port_id = kwargs['port_id']
dns_data_db = port_obj.PortDNS.get_object(
context, port_id=port_id)
if not dns_data_db:
return
if dns_data_db['current_dns_name']:
ip_allocations = context.session.query(
models_v2.IPAllocation).filter_by(port_id=port_id).all()
records = [alloc['ip_address'] for alloc in ip_allocations]
_remove_data_from_external_dns_service(
context, dns_driver, dns_data_db['current_dns_domain'],
dns_data_db['current_dns_name'], records)
def subscribe():
registry.subscribe(
_create_port_in_external_dns_service, resources.PORT,
events.AFTER_CREATE)
registry.subscribe(
_update_port_in_external_dns_service, resources.PORT,
events.AFTER_UPDATE)
registry.subscribe(
_delete_port_in_external_dns_service, resources.PORT,
events.BEFORE_DELETE)
subscribe()