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vyos-config-bcast-relay.py
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vyos-config-bcast-relay.py
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#!/usr/bin/env python3
#
# Copyright (C) 2017 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 sys
import os
import fnmatch
import time
import subprocess
from vyos.config import Config
from vyos.util import ConfigError
config_file = r'/etc/default/udp-broadcast-relay'
def get_config():
conf = Config()
conf.set_level("service broadcast-relay id")
relay_id = conf.list_nodes("")
relays = []
for id in relay_id:
interface_list = []
address = conf.return_value("{0} address".format(id))
description = conf.return_value("{0} description".format(id))
port = conf.return_value("{0} port".format(id))
# split the interface name listing and form a list
if conf.exists("{0} interface".format(id)):
intfs_names = []
intfs_names = conf.return_values("{0} interface".format(id))
for name in intfs_names:
interface_list.append(name)
relay = {
"id": id,
"address": address,
"description": description,
"interfaces" : interface_list,
"port": port
}
relays.append(relay)
return relays
def verify(relays):
for relay in relays:
if not relay["port"]:
raise ConfigError("UDP broadcast relay 'id {0}' requires a port number".format(relay["id"]))
if len(relay["interfaces"]) < 2:
raise ConfigError("UDP broadcast relay 'id {0}' requires at least 2 interfaces".format(relay["id"]))
return None
def generate(relays):
config_header = '### Autogenerated by {0} on {tm} ###\n'.format(os.path.basename(__file__),
tm=time.strftime("%a, %d %b %Y %H:%M:%S", time.localtime()))
config_dir = os.path.dirname(config_file)
config_filename = os.path.basename(config_file)
active_configs = []
for config in fnmatch.filter(os.listdir(config_dir), config_filename + '*'):
# determine prefix length to identify service instance
prefix_len = len(config_filename)
active_configs.append(config[prefix_len:])
# sort our list
active_configs.sort()
for id in active_configs[:]:
os.unlink(config_file + id)
for relay in relays:
file = config_file + str(relay["id"])
interfaces = ' '.join(str(intf) for intf in relay["interfaces"])
config_args = 'DAEMON_ARGS="{0} {1}"\n'.format(relay["port"], interfaces)
f = open(file, 'w')
f.write(config_header)
if relay["description"]:
f.write('# ' + relay["description"] + '\n')
f.write(config_args)
f.close()
return None
def apply(relays):
# first stop all running services
cmd = "sudo systemctl stop udp-broadcast-relay@{1..99}"
os.system(cmd)
# start only required service instances
for relay in relays:
cmd = "sudo systemctl start udp-broadcast-relay@{0}".format(relay["id"])
os.system(cmd)
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
sys.exit(1)

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