#!/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 glob import glob from netifaces import interfaces from sys import exit from vyos.config import Config from vyos.util import call from vyos.template import render from vyos import ConfigError from vyos import airbag airbag.enable() config_file_base = r'/etc/default/udp-broadcast-relay' def get_config(config=None): if config: conf = config else: conf = Config() base = ['service', 'broadcast-relay'] relay = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True) return relay def verify(relay): if not relay or 'disabled' in relay: return None for instance, config in relay.get('id', {}).items(): # we don't have to check this instance when it's disabled if 'disabled' in config: continue # we certainly require a UDP port to listen to if 'port' not in config: raise ConfigError(f'Port number mandatory for udp broadcast relay "{instance}"') # if only oone interface is given it's a string -> move to list if isinstance(config.get('interface', []), str): config['interface'] = [ config['interface'] ] # Relaying data without two interface is kinda senseless ... if len(config.get('interface', [])) < 2: raise ConfigError('At least two interfaces are required for udp broadcast relay "{instance}"') for interface in config.get('interface', []): if interface not in interfaces(): raise ConfigError('Interface "{interface}" does not exist!') return None def generate(relay): if not relay or 'disabled' in relay: return None for config in glob(config_file_base + '*'): os.remove(config) for instance, config in relay.get('id').items(): # we don't have to check this instance when it's disabled if 'disabled' in config: continue config['instance'] = instance render(config_file_base + instance, 'bcast-relay/udp-broadcast-relay.tmpl', config) return None def apply(relay): # first stop all running services call('systemctl stop udp-broadcast-relay@*.service') if not relay or 'disable' in relay: return None # start only required service instances for instance, config in relay.get('id').items(): # we don't have to check this instance when it's disabled if 'disabled' in config: continue call(f'systemctl start udp-broadcast-relay@{instance}.service') return None if __name__ == '__main__': try: c = get_config() verify(c) generate(c) apply(c) except ConfigError as e: print(e) exit(1)