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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 base import *
import telnetlib
from nsenter import Namespace
class QuaggaTelnetDaemon(object):
TELNET_PASSWORD = "zebra"
TELNET_PORT = 2605
def __init__(self, ctn):
self.ns = Namespace(ctn.get_pid(), 'net')
def __enter__(self):
self.ns.__enter__()
self.tn = telnetlib.Telnet('127.0.0.1', self.TELNET_PORT)
self.tn.read_until("Password: ")
self.tn.write(self.TELNET_PASSWORD + "\n")
self.tn.write("enable\n")
self.tn.read_until('bgpd#')
return self.tn
def __exit__(self, type, value, traceback):
self.tn.close()
self.ns.__exit__(type, value, traceback)
class QuaggaBGPContainer(BGPContainer):
WAIT_FOR_BOOT = 1
SHARED_VOLUME = '/etc/quagga'
def __init__(self, name, asn, router_id, ctn_image_name='osrg/quagga', zebra=False):
super(QuaggaBGPContainer, self).__init__(name, asn, router_id,
ctn_image_name)
self.shared_volumes.append((self.config_dir, self.SHARED_VOLUME))
self.zebra = zebra
def run(self):
super(QuaggaBGPContainer, self).run()
return self.WAIT_FOR_BOOT
def get_global_rib(self, prefix='', rf='ipv4'):
rib = []
if prefix != '':
return self.get_global_rib_with_prefix(prefix, rf)
with QuaggaTelnetDaemon(self) as tn:
tn.write('show bgp {0} unicast\n'.format(rf))
tn.read_until(' Network Next Hop Metric '
'LocPrf Weight Path')
read_next = False
for line in tn.read_until('bgpd#').split('\n'):
if line[:2] == '*>':
line = line[2:]
ibgp = False
if line[0] == 'i':
line = line[1:]
ibgp = True
elif not read_next:
continue
elems = line.split()
if len(elems) == 1:
read_next = True
prefix = elems[0]
continue
elif read_next:
nexthop = elems[0]
else:
prefix = elems[0]
nexthop = elems[1]
read_next = False
rib.append({'prefix': prefix, 'nexthop': nexthop,
'ibgp': ibgp})
return rib
def get_global_rib_with_prefix(self, prefix, rf):
rib = []
with QuaggaTelnetDaemon(self) as tn:
tn.write('show bgp {0} unicast {1}\n'.format(rf, prefix))
lines = [line.strip() for line in tn.read_until('bgpd#').split('\n')]
lines.pop(0) # throw away first line contains 'show bgp...'
if lines[0] == '% Network not in table':
return rib
lines = lines[2:]
if lines[0].startswith('Not advertised'):
lines.pop(0) # another useless line
elif lines[0].startswith('Advertised to non peer-group peers:'):
lines = lines[2:] # other useless lines
else:
raise Exception('unknown output format {0}'.format(lines))
nexthop = lines[1].split()[0].strip()
aspath = [int(asn) for asn in lines[0].split()]
rib.append({'prefix': prefix, 'nexthop': nexthop,
'aspath': aspath})
return rib
def get_neighbor_state(self, peer):
if peer not in self.peers:
raise Exception('not found peer {0}'.format(peer.router_id))
neigh_addr = self.peers[peer]['neigh_addr'].split('/')[0]
with QuaggaTelnetDaemon(self) as tn:
tn.write('show bgp neighbors\n')
neighbor_info = []
curr_info = []
for line in tn.read_until('bgpd#').split('\n'):
line = line.strip()
if line.startswith('BGP neighbor is'):
neighbor_info.append(curr_info)
curr_info = []
curr_info.append(line)
neighbor_info.append(curr_info)
for info in neighbor_info:
if not info[0].startswith('BGP neighbor is'):
continue
idx1 = info[0].index('BGP neighbor is ')
idx2 = info[0].index(',')
n_addr = info[0][idx1+len('BGP neighbor is '):idx2]
if n_addr == neigh_addr:
idx1 = info[2].index('= ')
state = info[2][idx1+len('= '):]
if state.startswith('Idle'):
return BGP_FSM_IDLE
elif state.startswith('Active'):
return BGP_FSM_ACTIVE
elif state.startswith('Established'):
return BGP_FSM_ESTABLISHED
else:
return state
raise Exception('not found peer {0}'.format(peer.router_id))
def create_config(self):
self._create_config_bgp()
if self.zebra:
self._create_config_zebra()
def _create_config_bgp(self):
c = CmdBuffer()
c << 'hostname bgpd'
c << 'password zebra'
c << 'router bgp {0}'.format(self.asn)
c << 'bgp router-id {0}'.format(self.router_id)
for peer, info in self.peers.iteritems():
version = netaddr.IPNetwork(info['neigh_addr']).version
n_addr = info['neigh_addr'].split('/')[0]
if version == 6:
c << 'no bgp default ipv4-unicast'
c << 'neighbor {0} remote-as {1}'.format(n_addr, peer.asn)
for name, policy in info['policies'].iteritems():
direction = policy['direction']
c << 'neighbor {0} route-map {1} {2}'.format(n_addr, name,
direction)
if info['passwd']:
c << 'neighbor {0} password {1}'.format(n_addr, info['passwd'])
if version == 6:
c << 'address-family ipv6 unicast'
c << 'neighbor {0} activate'.format(n_addr)
c << 'exit-address-family'
for route in self.routes.itervalues():
if route['rf'] == 'ipv4':
c << 'network {0}'.format(route['prefix'])
elif route['rf'] == 'ipv6':
c << 'address-family ipv6 unicast'
c << 'network {0}'.format(route['prefix'])
c << 'exit-address-family'
else:
raise Exception('unsupported route faily: {0}'.format(route['rf']))
for name, policy in self.policies.iteritems():
c << 'access-list {0} {1} {2}'.format(name, policy['type'],
policy['match'])
c << 'route-map {0} permit 10'.format(name)
c << 'match ip address {0}'.format(name)
c << 'set metric {0}'.format(policy['med'])
c << 'debug bgp as4'
c << 'debug bgp fsm'
c << 'debug bgp updates'
c << 'debug bgp events'
c << 'log file {0}/bgpd.log'.format(self.SHARED_VOLUME)
with open('{0}/bgpd.conf'.format(self.config_dir), 'w') as f:
print colors.yellow('[{0}\'s new config]'.format(self.name))
print colors.yellow(indent(str(c)))
f.writelines(str(c))
def _create_config_zebra(self):
c = CmdBuffer()
c << 'hostname zebra'
c << 'password zebra'
c << 'log file {0}/zebra.log'.format(self.SHARED_VOLUME)
with open('{0}/zebra.conf'.format(self.config_dir), 'w') as f:
print colors.yellow('[{0}\'s new config]'.format(self.name))
print colors.yellow(indent(str(c)))
f.writelines(str(c))
def reload_config(self):
daemon = []
daemon.append('bgpd')
if self.zebra:
daemon.append('zebra')
for d in daemon:
cmd = '/usr/bin/pkill {0} -SIGHUP'.format(d)
self.local(cmd)
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