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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 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
from pprint import pprint
airbag.enable()
config_file = r'/tmp/isis.frr'
default_config_data = {
'interface': ''
}
def get_config():
conf = Config()
base = ['protocols', 'isis']
isis = conf.get_config_dict(base, key_mangling=('-', '_'))
if not conf.exists(base):
isis = {}
pprint(isis)
return isis
def verify(isis):
# bail out early - looks like removal from running config
if not isis:
return None
for proc_id, foo_config in isis['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['isis']) > 1:
raise ConfigError('Only one isis process can be definded')
# If network entity title (net) not defined
if not "net" in foo_config:
raise ConfigError('Define net format iso is mandatory in \"isis {} net"!'.format(proc_id))
# If interface not set
if not "interface" in foo_config:
raise ConfigError('Define interface is mandatory in \"isis {} interface"!'.format(proc_id))
# If md5 and plaintext-password set at the same time
if 'area_password' in foo_config:
if "md5" in foo_config['area_password'] and "plaintext_password" in foo_config['area_password']:
raise ConfigError('Only one password type should be used in \"isis {} area-password"!'.format(proc_id))
# If one param from deley set, but not set others
if 'spf_delay_ietf' in foo_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 foo_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 foo_config:
proc_level = foo_config.get('level','').replace('-','_')
for proto, proto_config in foo_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(proc_id, 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(proc_id, proc_level, proto, redistribute_level))
return None
def generate(isis):
if not isis:
isis['new_frr_config'] = ''
return None
# render(config) not needed, its only for debug
render(config_file, 'frr/isis.frr.tmpl', isis)
isis['new_frr_config'] = render_to_string('frr/isis.frr.tmpl', isis)
return None
def apply(isis):
# Save original configration prior to starting any commit actions
isis['original_config'] = frr.get_configuration(daemon='isisd')
isis['modified_config'] = frr.replace_section(isis['original_config'], isis['new_frr_config'], from_re='router isis .*')
# Debugging
print('')
print('--------- DEBUGGING ----------')
print(f'Existing config:\n{isis["original_config"]}\n\n')
print(f'Replacement config:\n{isis["new_frr_config"]}\n\n')
print(f'Modified config:\n{isis["modified_config"]}\n\n')
# Frr Mark configuration will test for syntax errors and exception out if any syntax errors are detected
frr.mark_configuration(isis['modified_config'])
# Commit the resulting new configuration to frr, this will render an frr.CommitError() Exception on fail
frr.reload_configuration(isis['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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