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protocols_isis.py
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protocols_isis.py
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#!/usr/bin/env python3
#
# Copyright (C) 2017-2020 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
from sys import exit
from vyos.config import Config
from vyos.configdict import node_changed
from vyos import ConfigError
from vyos.util import call
from vyos.template import render
from vyos.template import render_to_string
from vyos import frr
from vyos import airbag
airbag.enable()
config_file = r'/tmp/isis.frr'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['protocols', 'isis']
isis = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
# determine which members have been removed
for instance in isis:
conf.set_level(base + [instance])
tmp = node_changed(conf, ['interface'])
if tmp:
isis[instance].update({'interface_remove': tmp})
return isis
def verify(isis):
# bail out early - looks like removal from running config
if not isis:
return None
for process, isis_config in isis.items():
# If more then one isis process is defined (Frr only supports one)
# http://docs.frrouting.org/en/latest/isisd.html#isis-router
if len(isis) > 1:
raise ConfigError('Only one isis process can be definded')
# If network entity title (net) not defined
if 'net' not in isis_config:
raise ConfigError('ISIS net format iso is mandatory!')
# If interface not set
if 'interface' not in isis_config:
raise ConfigError('ISIS interface is mandatory!')
# If md5 and plaintext-password set at the same time
if 'area_password' in isis_config:
if {'md5', 'plaintext_password'} <= set(isis_config['encryption']):
raise ConfigError('Can not use both md5 and plaintext-password for ISIS area-password!')
# If one param from deley set, but not set others
if 'spf_delay_ietf' in isis_config:
required_timers = ['holddown', 'init_delay', 'long_delay', 'short_delay', 'time_to_learn']
exist_timers = []
for elm_timer in required_timers:
if elm_timer in isis_config['spf_delay_ietf']:
exist_timers.append(elm_timer)
exist_timers = set(required_timers).difference(set(exist_timers))
if len(exist_timers) > 0:
raise ConfigError('All types of delay must be specified: ' + ', '.join(exist_timers).replace('_', '-'))
# If Redistribute set, but level don't set
if 'redistribute' in isis_config:
proc_level = isis_config.get('level','').replace('-','_')
for proto, proto_config in isis_config.get('redistribute', {}).get('ipv4', {}).items():
if 'level_1' not in proto_config and 'level_2' not in proto_config:
raise ConfigError('Redistribute level-1 or level-2 should be specified in \"protocols isis {} redistribute ipv4 {}\"'.format(process, proto))
for redistribute_level in proto_config.keys():
if proc_level and proc_level != 'level_1_2' and proc_level != redistribute_level:
raise ConfigError('\"protocols isis {0} redistribute ipv4 {2} {3}\" cannot be used with \"protocols isis {0} level {1}\"'.format(process, proc_level, proto, redistribute_level))
return None
def generate(isis):
if not isis:
isis['new_frr_config'] = ''
return None
# only one ISIS process is supported, so we can directly send the first key
# of the config dict
process = list(isis.keys())[0]
isis[process]['process'] = process
import pprint
pprint.pprint(isis[process])
# render(config) not needed, its only for debug
render(config_file, 'frr/isis.frr.tmpl', isis[process], trim_blocks=True)
isis['new_frr_config'] = render_to_string('frr/isis.frr.tmpl',
isis[process], trim_blocks=True)
return None
def apply(isis):
# Save original configration prior to starting any commit actions
frr_cfg = {}
frr_cfg['original_config'] = frr.get_configuration(daemon='isisd')
frr_cfg['modified_config'] = frr.replace_section(frr_cfg['original_config'], isis['new_frr_config'], from_re='router isis .*')
# Debugging
print('')
print('--------- DEBUGGING ----------')
print(f'Existing config:\n{frr_cfg["original_config"]}\n\n')
print(f'Replacement config:\n{isis["new_frr_config"]}\n\n')
print(f'Modified config:\n{frr_cfg["modified_config"]}\n\n')
# FRR mark configuration will test for syntax errors and throws an
# exception if any syntax errors is detected
frr.mark_configuration(frr_cfg['modified_config'])
# Commit resulting configuration to FRR, this will throw CommitError
# on failure
frr.reload_configuration(frr_cfg['modified_config'], daemon='isisd')
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)

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