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696 lines
25 KiB
Python
696 lines
25 KiB
Python
#
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#
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#
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from __future__ import absolute_import, division, print_function, \
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unicode_literals
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from collections import defaultdict
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from dyn.tm.errors import DynectGetError
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from dyn.tm.services.dsf import DSFARecord, DSFAAAARecord, DSFFailoverChain, \
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DSFMonitor, DSFNode, DSFRecordSet, DSFResponsePool, DSFRuleset, \
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TrafficDirector, get_all_dsf_monitors, get_all_dsf_services, \
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get_response_pool
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from dyn.tm.session import DynectSession
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from dyn.tm.zones import Zone as DynZone
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from logging import getLogger
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from threading import Lock
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from uuid import uuid4
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from ..record import Record
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from .base import BaseProvider
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class _CachingDynZone(DynZone):
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log = getLogger('_CachingDynZone')
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_cache = {}
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@classmethod
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def get(cls, zone_name, create=False):
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cls.log.debug('get: zone_name=%s, create=%s', zone_name, create)
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# This works in dyn zone names, without the trailing .
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try:
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dyn_zone = cls._cache[zone_name]
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cls.log.debug('get: cache hit')
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except KeyError:
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cls.log.debug('get: cache miss')
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try:
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dyn_zone = _CachingDynZone(zone_name)
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cls.log.debug('get: fetched')
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except DynectGetError:
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if not create:
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cls.log.debug("get: does't exist")
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return None
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# this value shouldn't really matter, it's not tied to
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# whois or anything
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hostname = 'hostmaster@{}'.format(zone_name[:-1])
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# Try again with the params necessary to create
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dyn_zone = _CachingDynZone(zone_name, ttl=3600,
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contact=hostname,
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serial_style='increment')
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cls.log.debug('get: created')
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cls._cache[zone_name] = dyn_zone
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return dyn_zone
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@classmethod
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def flush_zone(cls, zone_name):
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'''Flushes the zone cache, if there is one'''
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cls.log.debug('flush_zone: zone_name=%s', zone_name)
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try:
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del cls._cache[zone_name]
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except KeyError:
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pass
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def __init__(self, zone_name, *args, **kwargs):
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super(_CachingDynZone, self).__init__(zone_name, *args, **kwargs)
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self.flush_cache()
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def flush_cache(self):
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self._cached_records = None
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def get_all_records(self):
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if self._cached_records is None:
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self._cached_records = \
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super(_CachingDynZone, self).get_all_records()
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return self._cached_records
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def publish(self):
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super(_CachingDynZone, self).publish()
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self.flush_cache()
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class DynProvider(BaseProvider):
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'''
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Dynect Managed DNS provider
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dyn:
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class: octodns.provider.dyn.DynProvider
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# Your dynect customer name (required)
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customer: cust
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# Your dynect username (required)
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username: user
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# Your dynect password (required)
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password: pass
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# Whether or not to support TrafficDirectors and enable GeoDNS
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# (optional, default is false)
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traffic_directors_enabled: true
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Note: due to the way dyn.tm.session.DynectSession is managing things we can
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only really have a single DynProvider configured. When you create a
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DynectSession it's stored in a thread-local singleton. You don't invoke
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methods on this session or a client that holds on to it. The client
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libraries grab their per-thread session by accessing the singleton through
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DynectSession.get_session(). That fundamentally doesn't support having more
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than one account active at a time. See DynProvider._check_dyn_sess for some
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related bits.
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'''
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RECORDS_TO_TYPE = {
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'a_records': 'A',
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'aaaa_records': 'AAAA',
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'alias_records': 'ALIAS',
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'cname_records': 'CNAME',
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'mx_records': 'MX',
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'naptr_records': 'NAPTR',
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'ns_records': 'NS',
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'ptr_records': 'PTR',
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'sshfp_records': 'SSHFP',
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'spf_records': 'SPF',
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'srv_records': 'SRV',
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'txt_records': 'TXT',
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}
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TYPE_TO_RECORDS = {v: k for k, v in RECORDS_TO_TYPE.items()}
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SUPPORTS = set(TYPE_TO_RECORDS.keys())
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# https://help.dyn.com/predefined-geotm-regions-groups/
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REGION_CODES = {
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'NA': 11, # Continental North America
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'SA': 12, # Continental South America
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'EU': 13, # Contentinal Europe
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'AF': 14, # Continental Africa
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'AS': 15, # Contentinal Asia
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'OC': 16, # Contentinal Austrailia/Oceania
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'AN': 17, # Continental Antartica
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}
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_sess_create_lock = Lock()
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def __init__(self, id, customer, username, password,
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traffic_directors_enabled=False, *args, **kwargs):
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self.log = getLogger('DynProvider[{}]'.format(id))
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self.log.debug('__init__: id=%s, customer=%s, username=%s, '
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'password=***, traffic_directors_enabled=%s', id,
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customer, username, traffic_directors_enabled)
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# we have to set this before calling super b/c SUPPORTS_GEO requires it
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self.traffic_directors_enabled = traffic_directors_enabled
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super(DynProvider, self).__init__(id, *args, **kwargs)
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self.customer = customer
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self.username = username
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self.password = password
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self._cache = {}
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self._traffic_directors = None
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self._traffic_director_monitors = None
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@property
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def SUPPORTS_GEO(self):
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return self.traffic_directors_enabled
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def _check_dyn_sess(self):
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# We don't have to worry about locking for the check since the
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# underlying pieces are pre-thread. We can check to see if this thread
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# has a session and if so we're good to go.
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if DynectSession.get_session() is None:
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# We need to create a new session for this thread and DynectSession
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# creation is not thread-safe so we have to do the locking. If we
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# don't and multiple sessions start creattion before the the first
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# has finished (long time b/c it makes http calls) the subsequent
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# creates will blow away DynectSession._instances, potentially
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# multiple times if there are multiple creates in flight. Only the
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# last of these initial concurrent creates will exist in
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# DynectSession._instances dict and the others will be lost. When
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# this thread later tries to make api calls there won't be an
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# accessible session available for it to use.
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with self._sess_create_lock:
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DynectSession(self.customer, self.username, self.password)
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def _data_for_A(self, _type, records):
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return {
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'type': _type,
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'ttl': records[0].ttl,
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'values': [r.address for r in records]
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}
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_data_for_AAAA = _data_for_A
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def _data_for_ALIAS(self, _type, records):
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# See note on ttl in _kwargs_for_ALIAS
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record = records[0]
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return {
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'type': _type,
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'ttl': record.ttl,
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'value': record.alias
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}
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def _data_for_CNAME(self, _type, records):
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record = records[0]
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return {
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'type': _type,
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'ttl': record.ttl,
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'value': record.cname,
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}
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def _data_for_MX(self, _type, records):
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return {
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'type': _type,
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'ttl': records[0].ttl,
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'values': [{'preference': r.preference, 'exchange': r.exchange}
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for r in records],
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}
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def _data_for_NAPTR(self, _type, records):
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return {
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'type': _type,
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'ttl': records[0].ttl,
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'values': [{
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'order': r.order,
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'preference': r.preference,
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'flags': r.flags,
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'service': r.services,
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'regexp': r.regexp,
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'replacement': r.replacement,
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} for r in records]
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}
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def _data_for_NS(self, _type, records):
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return {
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'type': _type,
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'ttl': records[0].ttl,
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'values': [r.nsdname for r in records]
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}
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def _data_for_PTR(self, _type, records):
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record = records[0]
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return {
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'type': _type,
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'ttl': record.ttl,
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'value': record.ptrdname,
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}
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def _data_for_SPF(self, _type, records):
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record = records[0]
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return {
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'type': _type,
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'ttl': record.ttl,
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'values': [r.txtdata for r in records]
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}
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_data_for_TXT = _data_for_SPF
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def _data_for_SSHFP(self, _type, records):
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return {
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'type': _type,
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'ttl': records[0].ttl,
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'values': [{
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'algorithm': r.algorithm,
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'fingerprint_type': r.fptype,
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'fingerprint': r.fingerprint,
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} for r in records],
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}
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def _data_for_SRV(self, _type, records):
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return {
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'type': _type,
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'ttl': records[0].ttl,
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'values': [{
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'priority': r.priority,
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'weight': r.weight,
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'port': r.port,
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'target': r.target,
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} for r in records],
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}
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@property
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def traffic_directors(self):
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if self._traffic_directors is None:
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self._check_dyn_sess()
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tds = defaultdict(dict)
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for td in get_all_dsf_services():
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try:
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fqdn, _type = td.label.split(':', 1)
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except ValueError:
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continue
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tds[fqdn][_type] = td
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self._traffic_directors = dict(tds)
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return self._traffic_directors
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def _populate_traffic_directors(self, zone):
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self.log.debug('_populate_traffic_directors: zone=%s', zone.name)
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td_records = set()
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for fqdn, types in self.traffic_directors.items():
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# TODO: skip subzones
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if not fqdn.endswith(zone.name):
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continue
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for _type, td in types.items():
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# critical to call rulesets once, each call loads them :-(
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rulesets = td.rulesets
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# We start out with something that will always change show
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# change in case this is a busted TD. This will prevent us from
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# creating a duplicate td. We'll overwrite this with real data
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# provide we have it
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geo = {}
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data = {
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'geo': geo,
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'type': _type,
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'ttl': td.ttl,
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'values': ['0.0.0.0']
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}
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for ruleset in rulesets:
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try:
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record_set = ruleset.response_pools[0].rs_chains[0] \
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.record_sets[0]
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except IndexError:
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# problems indicate a malformed ruleset, ignore it
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continue
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_type = record_set.rdata_class
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if ruleset.label.startswith('default:'):
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data_for = getattr(self, '_data_for_{}'.format(_type))
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data.update(data_for(_type, record_set.records))
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else:
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# We've stored the geo in label
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try:
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code, _ = ruleset.label.split(':', 1)
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except ValueError:
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continue
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values = [r.address for r in record_set.records]
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geo[code] = values
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name = zone.hostname_from_fqdn(fqdn)
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record = Record.new(zone, name, data, source=self)
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zone.add_record(record)
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td_records.add(record)
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return td_records
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def populate(self, zone, target=False, lenient=False):
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self.log.debug('populate: name=%s, target=%s, lenient=%s', zone.name,
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target, lenient)
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before = len(zone.records)
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self._check_dyn_sess()
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td_records = set()
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if self.traffic_directors_enabled:
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td_records = self._populate_traffic_directors(zone)
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dyn_zone = _CachingDynZone.get(zone.name[:-1])
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if dyn_zone:
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values = defaultdict(lambda: defaultdict(list))
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for _type, records in dyn_zone.get_all_records().items():
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if _type == 'soa_records':
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continue
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_type = self.RECORDS_TO_TYPE[_type]
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for record in records:
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record_name = zone.hostname_from_fqdn(record.fqdn)
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values[record_name][_type].append(record)
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for name, types in values.items():
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for _type, records in types.items():
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data_for = getattr(self, '_data_for_{}'.format(_type))
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data = data_for(_type, records)
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record = Record.new(zone, name, data, source=self,
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lenient=lenient)
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if record not in td_records:
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zone.add_record(record)
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self.log.info('populate: found %s records',
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len(zone.records) - before)
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def _kwargs_for_A(self, record):
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return [{
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'address': v,
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'ttl': record.ttl,
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} for v in record.values]
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_kwargs_for_AAAA = _kwargs_for_A
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def _kwargs_for_CNAME(self, record):
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return [{
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'cname': record.value,
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'ttl': record.ttl,
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}]
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def _kwargs_for_ALIAS(self, record):
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# NOTE: Dyn's UI doesn't allow editing of ALIAS ttl, but the API seems
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# to accept and store the values we send it just fine. No clue if they
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# do anything with them. I'd assume they just obey the TTL of the
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# record that we're pointed at which makes sense.
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return [{
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'alias': record.value,
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'ttl': record.ttl,
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}]
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def _kwargs_for_MX(self, record):
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return [{
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'preference': v.preference,
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'exchange': v.exchange,
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'ttl': record.ttl,
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} for v in record.values]
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def _kwargs_for_NAPTR(self, record):
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return [{
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'flags': v.flags,
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'order': v.order,
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'preference': v.preference,
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'regexp': v.regexp,
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'replacement': v.replacement,
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'services': v.service,
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'ttl': record.ttl,
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} for v in record.values]
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def _kwargs_for_NS(self, record):
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return [{
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'nsdname': v,
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'ttl': record.ttl,
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} for v in record.values]
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def _kwargs_for_PTR(self, record):
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return [{
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'ptrdname': record.value,
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'ttl': record.ttl,
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}]
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def _kwargs_for_SSHFP(self, record):
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return [{
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'algorithm': v.algorithm,
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'fptype': v.fingerprint_type,
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'fingerprint': v.fingerprint,
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} for v in record.values]
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def _kwargs_for_SPF(self, record):
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return [{
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'txtdata': v,
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'ttl': record.ttl,
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} for v in record.values]
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def _kwargs_for_SRV(self, record):
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return [{
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'port': v.port,
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'priority': v.priority,
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'target': v.target,
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'weight': v.weight,
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'ttl': record.ttl,
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} for v in record.values]
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_kwargs_for_TXT = _kwargs_for_SPF
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def _traffic_director_monitor(self, fqdn):
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if self._traffic_director_monitors is None:
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self._traffic_director_monitors = \
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{m.label: m for m in get_all_dsf_monitors()}
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try:
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return self._traffic_director_monitors[fqdn]
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except KeyError:
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monitor = DSFMonitor(fqdn, protocol='HTTPS', response_count=2,
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probe_interval=60, retries=2, port=443,
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active='Y', host=fqdn[:-1], timeout=10,
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header='User-Agent: Dyn Monitor',
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path='/_dns')
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self._traffic_director_monitors[fqdn] = monitor
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return monitor
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def _find_or_create_pool(self, td, pools, label, _type, values,
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monitor_id=None):
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for pool in pools:
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if pool.label != label:
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continue
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records = pool.rs_chains[0].record_sets[0].records
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record_values = sorted([r.address for r in records])
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if record_values == values:
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# it's a match
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return pool
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# we need to create the pool
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_class = {
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'A': DSFARecord,
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'AAAA': DSFAAAARecord
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}[_type]
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records = [_class(v) for v in values]
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record_set = DSFRecordSet(_type, label, serve_count=len(records),
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records=records, dsf_monitor_id=monitor_id)
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chain = DSFFailoverChain(label, record_sets=[record_set])
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pool = DSFResponsePool(label, rs_chains=[chain])
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pool.create(td)
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return pool
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def _mod_rulesets(self, td, change):
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new = change.new
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# Response Pools
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pools = {}
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# Get existing pools. This should be simple, but it's not b/c the dyn
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# api is a POS. We need all response pools so we can GC and check to
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# make sure that what we're after doesn't already exist.
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# td.all_response_pools just returns thin objects that don't include
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# their rs_chains (and children down to actual records.) We could just
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# foreach over those turning them into full DSFResponsePool objects
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# with get_response_pool, but that'd be N round-trips. We can avoid
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# those round trips in cases where the pools are in use in rules where
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# they're already full objects.
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# First up populate all the full pools we have under rules, the _
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# prevents a td.refresh we don't need :-( seriously?
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existing_rulesets = td._rulesets
|
|
for ruleset in existing_rulesets:
|
|
for pool in ruleset.response_pools:
|
|
pools[pool.response_pool_id] = pool
|
|
# Now we need to find any pools that aren't referenced by rules
|
|
for pool in td.all_response_pools:
|
|
rpid = pool.response_pool_id
|
|
if rpid not in pools:
|
|
# we want this one, but it's thin, inflate it
|
|
pools[rpid] = get_response_pool(rpid, td)
|
|
# now that we have full objects for the complete set of existing pools,
|
|
# a list will be more useful
|
|
pools = pools.values()
|
|
|
|
# Rulesets
|
|
|
|
# add the default
|
|
label = 'default:{}'.format(uuid4().hex)
|
|
ruleset = DSFRuleset(label, 'always', [])
|
|
ruleset.create(td, index=0)
|
|
pool = self._find_or_create_pool(td, pools, 'default', new._type,
|
|
new.values)
|
|
# There's no way in the client lib to create a ruleset with an existing
|
|
# pool (ref'd by id) so we have to do this round-a-bout.
|
|
active_pools = {
|
|
'default': pool.response_pool_id
|
|
}
|
|
ruleset.add_response_pool(pool.response_pool_id)
|
|
|
|
monitor_id = self._traffic_director_monitor(new.fqdn).dsf_monitor_id
|
|
# Geos ordered least to most specific so that parents will always be
|
|
# created before their children (and thus can be referenced
|
|
geos = sorted(new.geo.items(), key=lambda d: d[0])
|
|
for _, geo in geos:
|
|
if geo.subdivision_code:
|
|
criteria = {
|
|
'province': geo.subdivision_code.lower()
|
|
}
|
|
elif geo.country_code:
|
|
criteria = {
|
|
'country': geo.country_code
|
|
}
|
|
else:
|
|
criteria = {
|
|
'region': self.REGION_CODES[geo.continent_code]
|
|
}
|
|
|
|
label = '{}:{}'.format(geo.code, uuid4().hex)
|
|
ruleset = DSFRuleset(label, 'geoip', [], {
|
|
'geoip': criteria
|
|
})
|
|
# Something you have to call create others the constructor does it
|
|
ruleset.create(td, index=0)
|
|
|
|
first = geo.values[0]
|
|
pool = self._find_or_create_pool(td, pools, first, new._type,
|
|
geo.values, monitor_id)
|
|
active_pools[geo.code] = pool.response_pool_id
|
|
ruleset.add_response_pool(pool.response_pool_id)
|
|
|
|
# look for parent rulesets we can add in the chain
|
|
for code in geo.parents:
|
|
try:
|
|
pool_id = active_pools[code]
|
|
# looking at client lib code, index > exists appends
|
|
ruleset.add_response_pool(pool_id, index=999)
|
|
except KeyError:
|
|
pass
|
|
# and always add default as the last
|
|
pool_id = active_pools['default']
|
|
ruleset.add_response_pool(pool_id, index=999)
|
|
|
|
# we're done with active_pools as a lookup, convert it in to a set of
|
|
# the ids in use
|
|
active_pools = set(active_pools.values())
|
|
# Clean up unused response_pools
|
|
for pool in pools:
|
|
if pool.response_pool_id in active_pools:
|
|
continue
|
|
pool.delete()
|
|
|
|
# Clean out the old rulesets
|
|
for ruleset in existing_rulesets:
|
|
ruleset.delete()
|
|
|
|
def _mod_geo_Create(self, dyn_zone, change):
|
|
new = change.new
|
|
fqdn = new.fqdn
|
|
_type = new._type
|
|
label = '{}:{}'.format(fqdn, _type)
|
|
node = DSFNode(new.zone.name, fqdn)
|
|
td = TrafficDirector(label, ttl=new.ttl, nodes=[node], publish='Y')
|
|
self.log.debug('_mod_geo_Create: td=%s', td.service_id)
|
|
self._mod_rulesets(td, change)
|
|
self.traffic_directors[fqdn] = {
|
|
_type: td
|
|
}
|
|
|
|
def _mod_geo_Update(self, dyn_zone, change):
|
|
new = change.new
|
|
if not new.geo:
|
|
# New record doesn't have geo we're going from a TD to a regular
|
|
# record
|
|
self._mod_Create(dyn_zone, change)
|
|
self._mod_geo_Delete(dyn_zone, change)
|
|
return
|
|
try:
|
|
td = self.traffic_directors[new.fqdn][new._type]
|
|
except KeyError:
|
|
# There's no td, this is actually a create, we must be going from a
|
|
# non-geo to geo record so delete the regular record as well
|
|
self._mod_geo_Create(dyn_zone, change)
|
|
self._mod_Delete(dyn_zone, change)
|
|
return
|
|
self._mod_rulesets(td, change)
|
|
|
|
def _mod_geo_Delete(self, dyn_zone, change):
|
|
existing = change.existing
|
|
fqdn_tds = self.traffic_directors[existing.fqdn]
|
|
_type = existing._type
|
|
fqdn_tds[_type].delete()
|
|
del fqdn_tds[_type]
|
|
|
|
def _mod_Create(self, dyn_zone, change):
|
|
new = change.new
|
|
kwargs_for = getattr(self, '_kwargs_for_{}'.format(new._type))
|
|
for kwargs in kwargs_for(new):
|
|
dyn_zone.add_record(new.name, new._type, **kwargs)
|
|
|
|
def _mod_Delete(self, dyn_zone, change):
|
|
existing = change.existing
|
|
if existing.name:
|
|
target = '{}.{}'.format(existing.name, existing.zone.name[:-1])
|
|
else:
|
|
target = existing.zone.name[:-1]
|
|
_type = self.TYPE_TO_RECORDS[existing._type]
|
|
for rec in dyn_zone.get_all_records()[_type]:
|
|
if rec.fqdn == target:
|
|
rec.delete()
|
|
|
|
def _mod_Update(self, dyn_zone, change):
|
|
self._mod_Delete(dyn_zone, change)
|
|
self._mod_Create(dyn_zone, change)
|
|
|
|
def _apply_traffic_directors(self, desired, changes, dyn_zone):
|
|
self.log.debug('_apply_traffic_directors: zone=%s', desired.name)
|
|
unhandled_changes = []
|
|
for c in changes:
|
|
# we only mess with changes that have geo info somewhere
|
|
if getattr(c.new, 'geo', False) or getattr(c.existing, 'geo',
|
|
False):
|
|
mod = getattr(self, '_mod_geo_{}'.format(c.__class__.__name__))
|
|
mod(dyn_zone, c)
|
|
else:
|
|
unhandled_changes.append(c)
|
|
|
|
return unhandled_changes
|
|
|
|
def _apply_regular(self, desired, changes, dyn_zone):
|
|
self.log.debug('_apply_regular: zone=%s', desired.name)
|
|
for c in changes:
|
|
mod = getattr(self, '_mod_{}'.format(c.__class__.__name__))
|
|
mod(dyn_zone, c)
|
|
|
|
# TODO: detect "extra" changes when monitors are out of date or failover
|
|
# chains are wrong etc.
|
|
|
|
def _apply(self, plan):
|
|
desired = plan.desired
|
|
changes = plan.changes
|
|
self.log.debug('_apply: zone=%s, len(changes)=%d', desired.name,
|
|
len(changes))
|
|
|
|
self._check_dyn_sess()
|
|
|
|
dyn_zone = _CachingDynZone.get(desired.name[:-1], create=True)
|
|
|
|
if self.traffic_directors_enabled:
|
|
# any changes left over don't involve geo
|
|
changes = self._apply_traffic_directors(desired, changes, dyn_zone)
|
|
|
|
self._apply_regular(desired, changes, dyn_zone)
|
|
|
|
dyn_zone.publish()
|