231 lines
8.0 KiB
Python
231 lines
8.0 KiB
Python
# Copyright 2012 Managed I.T.
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#
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# Author: Kiall Mac Innes <kiall@managedit.ie>
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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 os
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import glob
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import shutil
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from oslo.config import cfg
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from designate.openstack.common import log as logging
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from designate.i18n import _LW
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from designate import utils
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from designate.backend import base
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LOG = logging.getLogger(__name__)
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cfg.CONF.register_group(cfg.OptGroup(
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name='backend:bind9', title="Configuration for BIND9 Backend"
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))
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cfg.CONF.register_opts([
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cfg.StrOpt('rndc-host', default='127.0.0.1', help='RNDC Host'),
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cfg.IntOpt('rndc-port', default=953, help='RNDC Port'),
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cfg.StrOpt('rndc-config-file', default=None,
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help='RNDC Config File'),
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cfg.StrOpt('rndc-key-file', default=None, help='RNDC Key File'),
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cfg.StrOpt('nzf-path', default='/var/cache/bind',
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help='Path where Bind9 stores the nzf files'),
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], group='backend:bind9')
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class Bind9Backend(base.Backend):
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__plugin_name__ = 'bind9'
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def start(self):
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super(Bind9Backend, self).start()
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domains = self.central_service.find_domains(self.admin_context)
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for domain in domains:
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rndc_op = 'reload'
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rndc_call = self._rndc_base() + [rndc_op]
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rndc_call.extend([domain['name']])
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try:
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LOG.debug('Calling RNDC with: %s' % " ".join(rndc_call))
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utils.execute(*rndc_call)
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except utils.processutils.ProcessExecutionError as proc_exec_err:
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stderr = proc_exec_err.stderr
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if stderr.count("rndc: 'reload' failed: not found") is not 0:
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LOG.warn(_LW("Domain %(d_name)s (%(d_id)s) "
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"missing from backend, recreating") %
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{'d_name': domain['name'], 'd_id': domain['id']})
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self._sync_domain(domain, new_domain_flag=True)
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else:
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raise proc_exec_err
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def create_server(self, context, server):
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LOG.debug('Create Server')
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self._sync_domains_on_server_change()
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def update_server(self, context, server):
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LOG.debug('Update Server')
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self._sync_domains_on_server_change()
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def delete_server(self, context, server):
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LOG.debug('Delete Server')
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self._sync_domains_on_server_change()
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def create_domain(self, context, domain):
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LOG.debug('Create Domain')
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self._sync_domain(domain, new_domain_flag=True)
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def update_domain(self, context, domain):
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LOG.debug('Update Domain')
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self._sync_domain(domain)
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def delete_domain(self, context, domain):
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LOG.debug('Delete Domain')
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self._sync_delete_domain(domain)
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def update_recordset(self, context, domain, recordset):
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LOG.debug('Update RecordSet')
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self._sync_domain(domain)
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def delete_recordset(self, context, domain, recordset):
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LOG.debug('Delete RecordSet')
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self._sync_domain(domain)
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def create_record(self, context, domain, recordset, record):
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LOG.debug('Create Record')
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self._sync_domain(domain)
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def update_record(self, context, domain, recordset, record):
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LOG.debug('Update Record')
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self._sync_domain(domain)
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def delete_record(self, context, domain, recordset, record):
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LOG.debug('Delete Record')
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self._sync_domain(domain)
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def _rndc_base(self):
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rndc_call = [
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'rndc',
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'-s', cfg.CONF[self.name].rndc_host,
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'-p', str(cfg.CONF[self.name].rndc_port),
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]
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if cfg.CONF[self.name].rndc_config_file:
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rndc_call.extend(['-c', cfg.CONF[self.name].rndc_config_file])
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if cfg.CONF[self.name].rndc_key_file:
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rndc_call.extend(['-k', cfg.CONF[self.name].rndc_key_file])
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return rndc_call
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def _sync_delete_domain(self, domain, new_domain_flag=False):
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"""Remove domain zone files and reload bind config"""
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LOG.debug('Delete Domain: %s' % domain['id'])
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output_folder = os.path.join(os.path.abspath(cfg.CONF.state_path),
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'bind9')
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output_path = os.path.join(output_folder, '%s.zone' %
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"_".join([domain['name'], domain['id']]))
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os.remove(output_path)
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rndc_op = 'delzone'
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rndc_call = self._rndc_base() + [rndc_op, domain['name']]
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utils.execute(*rndc_call)
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# This goes and gets the name of the .nzf file that is a mirror of the
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# zones.config file we wish to maintain. The file name can change as it
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# is a hash of rndc view name, we're only interested in the first file
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# name this returns because there is only one .nzf file
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nzf_name = glob.glob('%s/*.nzf' % cfg.CONF[self.name].nzf_path)
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output_file = os.path.join(output_folder, 'zones.config')
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shutil.copyfile(nzf_name[0], output_file)
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def _sync_domain(self, domain, new_domain_flag=False):
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"""Sync a single domain's zone file and reload bind config"""
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LOG.debug('Synchronising Domain: %s' % domain['id'])
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servers = self.central_service.find_servers(self.admin_context)
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recordsets = self.central_service.find_recordsets(
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self.admin_context, {'domain_id': domain['id']})
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records = []
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for recordset in recordsets:
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criterion = {
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'domain_id': domain['id'],
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'recordset_id': recordset['id']
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}
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raw_records = self.central_service.find_records(
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self.admin_context, criterion)
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for record in raw_records:
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records.append({
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'name': recordset['name'],
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'type': recordset['type'],
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'ttl': recordset['ttl'],
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'priority': record['priority'],
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'data': record['data'],
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})
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output_folder = os.path.join(os.path.abspath(cfg.CONF.state_path),
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'bind9')
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output_path = os.path.join(output_folder, '%s.zone' %
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"_".join([domain['name'], domain['id']]))
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utils.render_template_to_file('bind9-zone.jinja2',
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output_path,
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servers=servers,
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domain=domain,
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records=records)
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rndc_call = self._rndc_base()
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if new_domain_flag:
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rndc_op = [
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'addzone',
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'%s { type master; file "%s"; };' % (domain['name'],
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output_path),
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]
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rndc_call.extend(rndc_op)
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else:
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rndc_op = 'reload'
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rndc_call.extend([rndc_op])
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rndc_call.extend([domain['name']])
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LOG.debug('Calling RNDC with: %s' % " ".join(rndc_call))
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utils.execute(*rndc_call)
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nzf_name = glob.glob('%s/*.nzf' % cfg.CONF[self.name].nzf_path)
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output_file = os.path.join(output_folder, 'zones.config')
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shutil.copyfile(nzf_name[0], output_file)
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def _sync_domains_on_server_change(self):
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# TODO(eankutse): Improve this so it scales. Need to design
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# for it in the new Pool Manager/Agent for the backend that is
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# being proposed
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LOG.debug('Synchronising domains on server change')
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domains = self.central_service.find_domains(self.admin_context)
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for domain in domains:
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self._sync_domain(domain)
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