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#!/usr/bin/env python3
#
# Copyright (C) 2018-2022 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.base import Warning
from vyos.config import Config
from vyos.configdict import dict_merge
from vyos.template import render
from vyos.util import call
from vyos.xml import defaults
from vyos import ConfigError
from vyos import airbag
airbag.enable()
config_file = r'/run/radvd/radvd.conf'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['service', 'router-advert']
rtradv = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
# We have gathered the dict representation of the CLI, but there are default
# options which we need to update into the dictionary retrived.
default_interface_values = defaults(base + ['interface'])
# we deal with prefix, route defaults later on
if 'prefix' in default_interface_values:
del default_interface_values['prefix']
if 'route' in default_interface_values:
del default_interface_values['route']
default_prefix_values = defaults(base + ['interface', 'prefix'])
default_route_values = defaults(base + ['interface', 'route'])
if 'interface' in rtradv:
for interface in rtradv['interface']:
rtradv['interface'][interface] = dict_merge(
default_interface_values, rtradv['interface'][interface])
if 'prefix' in rtradv['interface'][interface]:
for prefix in rtradv['interface'][interface]['prefix']:
rtradv['interface'][interface]['prefix'][prefix] = dict_merge(
default_prefix_values, rtradv['interface'][interface]['prefix'][prefix])
if 'route' in rtradv['interface'][interface]:
for route in rtradv['interface'][interface]['route']:
rtradv['interface'][interface]['route'][route] = dict_merge(
default_route_values, rtradv['interface'][interface]['route'][route])
if 'name_server' in rtradv['interface'][interface]:
# always use a list when dealing with nameservers - eases the template generation
if isinstance(rtradv['interface'][interface]['name_server'], str):
rtradv['interface'][interface]['name_server'] = [
rtradv['interface'][interface]['name_server']]
return rtradv
def verify(rtradv):
if not rtradv:
return None
if 'interface' not in rtradv:
return None
for interface, interface_config in rtradv['interface'].items():
if 'prefix' in interface:
for prefix, prefix_config in interface_config['prefix'].items():
valid_lifetime = prefix_config['valid_lifetime']
if valid_lifetime == 'infinity':
valid_lifetime = 4294967295
preferred_lifetime = prefix_config['preferred_lifetime']
if preferred_lifetime == 'infinity':
preferred_lifetime = 4294967295
if not (int(valid_lifetime) > int(preferred_lifetime)):
raise ConfigError('Prefix valid-lifetime must be greater then preferred-lifetime')
if 'name_server_lifetime' in interface_config:
# man page states:
# The maximum duration how long the RDNSS entries are used for name
# resolution. A value of 0 means the nameserver must no longer be
# used. The value, if not 0, must be at least MaxRtrAdvInterval. To
# ensure stale RDNSS info gets removed in a timely fashion, this
# should not be greater than 2*MaxRtrAdvInterval.
lifetime = int(interface_config['name_server_lifetime'])
interval_max = int(interface_config['interval']['max'])
if lifetime > 0:
if lifetime < int(interval_max):
raise ConfigError(f'RDNSS lifetime must be at least "{interval_max}" seconds!')
if lifetime > 2* interval_max:
Warning(f'RDNSS lifetime should not exceed "{2 * interval_max}" which is two times "interval max"!')
return None
def generate(rtradv):
if not rtradv:
return None
render(config_file, 'router-advert/radvd.conf.j2', rtradv, permission=0o644)
return None
def apply(rtradv):
systemd_service = 'radvd.service'
if not rtradv:
# bail out early - looks like removal from running config
call(f'systemctl stop {systemd_service}')
if os.path.exists(config_file):
os.unlink(config_file)
return None
call(f'systemctl reload-or-restart {systemd_service}')
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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