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bcast_relay.py
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bcast_relay.py
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#!/usr/bin/env python3
#
# Copyright (C) 2017-2023 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 AF_INET
from sys import exit
from vyos.config import Config
from vyos.configverify import verify_interface_exists
from vyos.template import render
from vyos.utils.process import call
from vyos.utils.network import is_afi_configured
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 is mandatory for UDP broadcast relay "{instance}"')
# 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', []):
verify_interface_exists(interface)
if not is_afi_configured(interface, AF_INET):
raise ConfigError(f'Interface "{interface}" has no IPv4 address configured!')
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.j2',
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)

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