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# Copyright 2016 Hewlett Packard Enterprise Development Company, L.P.
#
# 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.
import os.path
import urllib
import netaddr
from oslo_config import cfg
from oslo_log import log as logging
import requests
from designate.backend import base
from designate import exceptions
LOG = logging.getLogger(__name__)
CONF = cfg.CONF
class PDNS4Backend(base.Backend):
__plugin_name__ = 'pdns4'
__backend_status__ = 'integrated'
def __init__(self, target):
super(PDNS4Backend, self).__init__(target)
self.api_endpoint = self.options.get('api_endpoint')
self.api_token = self.options.get('api_token')
self.tsigkey_name = self.options.get('tsigkey_name', None)
self.api_ca_cert = self.options.get('api_ca_cert')
self.headers = {
"X-API-Key": self.api_token
}
def _build_url(self, zone=''):
r_url = urllib.parse.urlparse(self.api_endpoint)
return "%s://%s/api/v1/servers/localhost/zones%s%s" % (
r_url.scheme, r_url.netloc, '/' if zone else '', zone)
def _check_zone_exists(self, zone):
zone = requests.get(
self._build_url(zone=zone.name),
headers=self.headers,
)
return zone.status_code == 200
def _verify_ssl(self):
"""
Function to check if variable has been declared.
If the api_ca_cert is None, left blank or the default value 'changeme',
returns False to disable ssl verification for the request.
If api_ca_cert is defined, check if the file actually exists. If it
does exist, return its value (should be the location of a CA
certificate)
"""
ca_cert = self.api_ca_cert
if ca_cert is None or ca_cert == 'changeme' or ca_cert == '':
return False
if not os.path.exists(ca_cert):
LOG.error("Could not find %s CA certificate."
"No such file or directory",
ca_cert)
return False
return ca_cert
def create_zone(self, context, zone):
"""Create a DNS zone"""
masters = []
for master in self.masters:
host = master.host
if netaddr.IPAddress(host).version == 6:
host = '[%s]' % host
masters.append('%s:%d' % (host, master.port))
data = {
"name": zone.name,
"kind": "slave",
"masters": masters,
}
if self.tsigkey_name:
data['slave_tsig_key_ids'] = [self.tsigkey_name]
if self._check_zone_exists(zone):
LOG.info(
'%s exists on the server. Deleting zone before creation', zone
)
try:
self.delete_zone(context, zone)
except exceptions.Backend:
LOG.error('Could not delete pre-existing zone %s', zone)
raise
try:
requests.post(
self._build_url(),
json=data,
headers=self.headers,
verify=self._verify_ssl()
).raise_for_status()
except requests.HTTPError as e:
# check if the zone was actually created - even with errors pdns
# will create the zone sometimes
if self._check_zone_exists(zone):
LOG.info("%s was created with an error. Deleting zone", zone)
try:
self.delete_zone(context, zone)
except exceptions.Backend:
LOG.error('Could not delete errored zone %s', zone)
raise exceptions.Backend(e)
def delete_zone(self, context, zone):
"""Delete a DNS zone"""
# First verify that the zone exists -- If it's not present
# in the backend then we can just declare victory.
if self._check_zone_exists(zone):
try:
requests.delete(
self._build_url(zone.name),
headers=self.headers
).raise_for_status()
except requests.HTTPError as e:
raise exceptions.Backend(e)
else:
LOG.warning("Trying to delete zone %s but that zone is not "
"present in the pdns backend. Assuming success.",
zone)
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