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# Copyright (c) 2014 Rackspace Hosting
#
# 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 ssl
import socket
from os_ken import cfg
from os_ken.base import app_manager
from os_ken.lib import hub
from os_ken.lib import ip
from os_ken.services.protocols.ovsdb import client
from os_ken.services.protocols.ovsdb import event
from os_ken.controller import handler
opts = (cfg.StrOpt('address', default='0.0.0.0', help='OVSDB address'),
cfg.IntOpt('port', default=6640, help='OVSDB port'),
cfg.IntOpt('probe-interval', help='OVSDB reconnect probe interval'),
cfg.IntOpt('min-backoff',
help=('OVSDB reconnect minimum milliseconds between '
'connection attemps')),
cfg.IntOpt('max-backoff',
help=('OVSDB reconnect maximum milliseconds between '
'connection attemps')),
cfg.StrOpt('mngr-privkey', default=None, help='manager private key'),
cfg.StrOpt('mngr-cert', default=None, help='manager certificate'),
cfg.ListOpt('whitelist', default=[],
help='Whitelist of address to allow to connect'),
cfg.ListOpt('schema-tables', default=[],
help='Tables in the OVSDB schema to configure'),
cfg.ListOpt('schema-exclude-columns', default=[],
help='Table columns in the OVSDB schema to filter out. '
'Values should be in the format: <table>.<column>.'
'Ex: Bridge.netflow,Interface.statistics')
)
cfg.CONF.register_opts(opts, 'ovsdb')
class OVSDB(app_manager.OSKenApp):
_EVENTS = [event.EventNewOVSDBConnection,
event.EventModifyRequest,
event.EventReadRequest]
def __init__(self, *args, **kwargs):
super(OVSDB, self).__init__(*args, **kwargs)
self._address = self.CONF.ovsdb.address
self._port = self.CONF.ovsdb.port
self._probe_interval = self.CONF.ovsdb.probe_interval
self._min_backoff = self.CONF.ovsdb.min_backoff
self._max_backoff = self.CONF.ovsdb.max_backoff
self._clients = {}
def _accept(self, server):
if self.CONF.ovsdb.whitelist:
def check(address):
if address in self.CONF.ovsdb.whitelist:
return True
self.logger.debug('Connection from non-whitelist client '
'(%s:%s)' % address)
return False
else:
def check(address):
return True
while self.is_active:
try:
# TODO(jkoelker) SSL Certificate Fingerprint check
sock, client_address = server.accept()
except:
if self.is_active:
self.logger.exception('Error accepting connection')
continue
if not check(client_address[0]):
sock.shutdown(socket.SHUT_RDWR)
sock.close()
continue
if ip.valid_ipv6(client_address[0]):
self.logger.debug(
'New connection from [%s]:%s' % client_address[:2])
else:
self.logger.debug(
'New connection from %s:%s' % client_address[:2])
t = hub.spawn(self._start_remote, sock, client_address)
self.threads.append(t)
def _bulk_read_handler(self, ev):
results = []
def done(gt, *args, **kwargs):
if gt in self.threads:
self.threads.remove(gt)
results.append(gt.wait())
threads = []
for c in self._clients.values():
gt = hub.spawn(c.read_request_handler, ev, bulk=True)
threads.append(gt)
self.threads.append(gt)
gt.link(done)
hub.joinall(threads)
rep = event.EventReadReply(None, results)
self.reply_to_request(ev, rep)
def _proxy_event(self, ev):
system_id = ev.system_id
client_name = client.RemoteOvsdb.instance_name(system_id)
if client_name not in self._clients:
self.logger.info('Unknown remote system_id %s' % system_id)
return
return self.send_event(client_name, ev)
def _start_remote(self, sock, client_address):
schema_tables = cfg.CONF.ovsdb.schema_tables
schema_ex_col = {}
if cfg.CONF.ovsdb.schema_exclude_columns:
for c in cfg.CONF.ovsdb.schema_exclude_columns:
tbl, col = c.split('.')
if tbl in schema_ex_col:
schema_ex_col[tbl].append(col)
else:
schema_ex_col[tbl] = [col]
app = client.RemoteOvsdb.factory(sock, client_address,
probe_interval=self._probe_interval,
min_backoff=self._min_backoff,
max_backoff=self._max_backoff,
schema_tables=schema_tables,
schema_exclude_columns=schema_ex_col)
if app:
self._clients[app.name] = app
app.start()
ev = event.EventNewOVSDBConnection(app)
self.send_event_to_observers(ev)
else:
try:
sock.shutdown(socket.SHUT_RDWR)
except:
pass
sock.close()
def start(self):
if ip.valid_ipv6(self._address):
server = hub.listen(
(self._address, self._port), family=socket.AF_INET6)
else:
server = hub.listen((self._address, self._port))
key = self.CONF.ovsdb.mngr_privkey or self.CONF.ctl_privkey
cert = self.CONF.ovsdb.mngr_cert or self.CONF.ctl_cert
if key is not None and cert is not None:
ctx = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
ctx.load_cert_chain(cert, key)
if self.CONF.ca_certs is not None:
ctx.verify_mode = ssl.CERT_REQUIRED
ctx.load_verify_locations(self.CONF.ca_certs)
server = ctx.wrap_socket(server, server_side=True)
self._server = server
if ip.valid_ipv6(self._address):
self.logger.info(
'Listening on [%s]:%s for clients', self._address, self._port)
else:
self.logger.info(
'Listening on %s:%s for clients', self._address, self._port)
t = hub.spawn(self._accept, self._server)
super(OVSDB, self).start()
return t
def stop(self):
# NOTE(jkoelker) Attempt to gracefully stop the accept loop
self.is_active = False
# NOTE(jkoelker) Forceably kill the loop and clear the main_thread
if self.main_thread:
hub.kill(self.main_thread)
self.main_thread = None
# NOTE(jkoelker) Stop all the clients
for c in self._clients.values():
c.stop()
# NOTE(jkoelker) super will only take care of the event and joining now
super(OVSDB, self).stop()
@handler.set_ev_cls(event.EventModifyRequest)
def modify_request_handler(self, ev):
system_id = ev.system_id
client_name = client.RemoteOvsdb.instance_name(system_id)
remote = self._clients.get(client_name)
if not remote:
msg = 'Unknown remote system_id %s' % system_id
self.logger.info(msg)
rep = event.EventModifyReply(system_id, None, None, msg)
return self.reply_to_request(ev, rep)
return remote.modify_request_handler(ev)
@handler.set_ev_cls(event.EventReadRequest)
def read_request_handler(self, ev):
system_id = ev.system_id
if system_id is None:
def done(gt, *args, **kwargs):
if gt in self.threads:
self.threads.remove(gt)
thread = hub.spawn(self._bulk_read_handler, ev)
self.threads.append(thread)
return thread.link(done)
client_name = client.RemoteOvsdb.instance_name(system_id)
remote = self._clients.get(client_name)
if not remote:
msg = 'Unknown remote system_id %s' % system_id
self.logger.info(msg)
rep = event.EventReadReply(system_id, None, msg)
return self.reply_to_request(ev, rep)
return remote.read_request_handler(ev)
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