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# Copyright (C) 2015 Nippon Telegraph and Telephone Corporation.
#
# 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 __future__ import absolute_import
from fabric import colors
from lib.base import (
BGPContainer,
CmdBuffer,
try_several_times,
wait_for_completion,
)
class ExaBGPContainer(BGPContainer):
SHARED_VOLUME = '/shared_volume'
PID_FILE = '/var/run/exabgp.pid'
def __init__(self, name, asn, router_id, ctn_image_name='osrg/exabgp:4.0.5'):
super(ExaBGPContainer, self).__init__(name, asn, router_id, ctn_image_name)
self.shared_volumes.append((self.config_dir, self.SHARED_VOLUME))
def _pre_start_exabgp(self):
# Create named pipes for "exabgpcli"
named_pipes = '/run/exabgp.in /run/exabgp.out'
self.local('mkfifo {0}'.format(named_pipes), capture=True)
self.local('chmod 777 {0}'.format(named_pipes), capture=True)
def _start_exabgp(self):
cmd = CmdBuffer(' ')
cmd << 'env exabgp.log.destination={0}/exabgpd.log'.format(self.SHARED_VOLUME)
cmd << 'exabgp.daemon.user=root'
cmd << 'exabgp.daemon.pid={0}'.format(self.PID_FILE)
cmd << 'exabgp.tcp.bind="0.0.0.0" exabgp.tcp.port=179'
cmd << 'exabgp {0}/exabgpd.conf'.format(self.SHARED_VOLUME)
self.local(str(cmd), detach=True)
def _wait_for_boot(self):
def _f():
ret = self.local('exabgpcli version > /dev/null 2>&1; echo $?', capture=True)
return ret == '0'
return wait_for_completion(_f)
def run(self):
super(ExaBGPContainer, self).run()
self._pre_start_exabgp()
# To start ExaBGP, it is required to configure neighbor settings, so
# here does not start ExaBGP yet.
# self._start_exabgp()
return self.WAIT_FOR_BOOT
def create_config(self):
# Manpage of exabgp.conf(5):
# https://github.com/Exa-Networks/exabgp/blob/master/doc/man/exabgp.conf.5
cmd = CmdBuffer('\n')
for peer, info in self.peers.iteritems():
cmd << 'neighbor {0} {{'.format(info['neigh_addr'].split('/')[0])
cmd << ' router-id {0};'.format(self.router_id)
cmd << ' local-address {0};'.format(info['local_addr'].split('/')[0])
cmd << ' local-as {0};'.format(self.asn)
cmd << ' peer-as {0};'.format(peer.asn)
caps = []
if info['as2']:
caps.append(' asn4 disable;')
if info['addpath']:
caps.append(' add-path send/receive;')
if caps:
cmd << ' capability {'
for cap in caps:
cmd << cap
cmd << ' }'
if info['passwd']:
cmd << ' md5-password "{0}";'.format(info['passwd'])
if info['passive']:
cmd << ' passive;'
cmd << '}'
with open('{0}/exabgpd.conf'.format(self.config_dir), 'w') as f:
print colors.yellow('[{0}\'s new exabgpd.conf]'.format(self.name))
print colors.yellow(str(cmd))
f.write(str(cmd))
def _is_running(self):
ret = self.local("test -f {0}; echo $?".format(self.PID_FILE), capture=True)
return ret == '0'
def reload_config(self):
if not self.peers:
return
def _reload():
if self._is_running():
self.local('/usr/bin/pkill --pidfile {0} && rm -f {0}'.format(self.PID_FILE), capture=True)
else:
self._start_exabgp()
self._wait_for_boot()
if not self._is_running():
raise RuntimeError('Could not start ExaBGP')
try_several_times(_reload)
def _construct_ip_unicast(self, path):
cmd = CmdBuffer(' ')
cmd << str(path['prefix'])
if path['next-hop']:
cmd << 'next-hop {0}'.format(path['next-hop'])
else:
cmd << 'next-hop self'
return str(cmd)
def _construct_flowspec(self, path):
cmd = CmdBuffer(' ')
cmd << '{ match {'
for match in path['matchs']:
cmd << '{0};'.format(match)
cmd << '} then {'
for then in path['thens']:
cmd << '{0};'.format(then)
cmd << '} }'
return str(cmd)
def _construct_path_attributes(self, path):
cmd = CmdBuffer(' ')
if path['as-path']:
cmd << 'as-path [{0}]'.format(' '.join(str(i) for i in path['as-path']))
if path['med']:
cmd << 'med {0}'.format(path['med'])
if path['local-pref']:
cmd << 'local-preference {0}'.format(path['local-pref'])
if path['community']:
cmd << 'community [{0}]'.format(' '.join(c for c in path['community']))
if path['extended-community']:
cmd << 'extended-community [{0}]'.format(path['extended-community'])
if path['attr']:
cmd << 'attribute [ {0} ]'.format(path['attr'])
return str(cmd)
def _construct_path(self, path, rf='ipv4', is_withdraw=False):
cmd = CmdBuffer(' ')
if rf in ['ipv4', 'ipv6']:
cmd << 'route'
cmd << self._construct_ip_unicast(path)
elif rf in ['ipv4-flowspec', 'ipv6-flowspec']:
cmd << 'flow route'
cmd << self._construct_flowspec(path)
else:
raise ValueError('unsupported address family: %s' % rf)
if path['identifier']:
cmd << 'path-information {0}'.format(path['identifier'])
if not is_withdraw:
# Withdrawal should not require path attributes
cmd << self._construct_path_attributes(path)
return str(cmd)
def add_route(self, route, rf='ipv4', attribute=None, aspath=None,
community=None, med=None, extendedcommunity=None,
nexthop=None, matchs=None, thens=None,
local_pref=None, identifier=None, reload_config=False):
if not self._is_running():
raise RuntimeError('ExaBGP is not yet running')
self.routes.setdefault(route, [])
path = {
'prefix': route,
'rf': rf,
'attr': attribute,
'next-hop': nexthop,
'as-path': aspath,
'community': community,
'med': med,
'local-pref': local_pref,
'extended-community': extendedcommunity,
'identifier': identifier,
'matchs': matchs,
'thens': thens,
}
cmd = CmdBuffer(' ')
cmd << "exabgpcli 'announce"
cmd << self._construct_path(path, rf=rf)
cmd << "'"
self.local(str(cmd), capture=True)
self.routes[route].append(path)
def del_route(self, route, identifier=None, reload_config=False):
if not self._is_running():
raise RuntimeError('ExaBGP is not yet running')
path = None
new_paths = []
for p in self.routes.get(route, []):
if p['identifier'] != identifier:
new_paths.append(p)
else:
path = p
if not path:
return
rf = path['rf']
cmd = CmdBuffer(' ')
cmd << "exabgpcli 'withdraw"
cmd << self._construct_path(path, rf=rf, is_withdraw=True)
cmd << "'"
self.local(str(cmd), capture=True)
self.routes[route] = new_paths
class RawExaBGPContainer(ExaBGPContainer):
def __init__(self, name, config, ctn_image_name='osrg/exabgp',
exabgp_path=''):
asn = None
router_id = None
for line in config.split('\n'):
line = line.strip()
if line.startswith('local-as'):
asn = int(line[len('local-as'):].strip('; '))
if line.startswith('router-id'):
router_id = line[len('router-id'):].strip('; ')
if not asn:
raise Exception('asn not in exabgp config')
if not router_id:
raise Exception('router-id not in exabgp config')
self.config = config
super(RawExaBGPContainer, self).__init__(name, asn, router_id,
ctn_image_name, exabgp_path)
def create_config(self):
with open('{0}/exabgpd.conf'.format(self.config_dir), 'w') as f:
print colors.yellow('[{0}\'s new exabgpd.conf]'.format(self.name))
print colors.yellow(self.config)
f.write(self.config)
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