#!/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 or equal to 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)