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igmp_proxy.py
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igmp_proxy.py
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#!/usr/bin/env python3
#
# Copyright (C) 2018-2020 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 sys import exit
from copy import deepcopy
from netifaces import interfaces
from vyos.config import Config
from vyos import ConfigError
from vyos.util import call
from vyos.template import render
config_file = r'/etc/igmpproxy.conf'
default_config_data = {
'disable': False,
'disable_quickleave': False,
'interfaces': [],
}
def get_config():
igmp_proxy = deepcopy(default_config_data)
conf = Config()
base = ['protocols', 'igmp-proxy']
if not conf.exists(base):
return None
else:
conf.set_level(base)
# Network interfaces to listen on
if conf.exists(['disable']):
igmp_proxy['disable'] = True
# Option to disable "quickleave"
if conf.exists(['disable-quickleave']):
igmp_proxy['disable_quickleave'] = True
for intf in conf.list_nodes(['interface']):
conf.set_level(base + ['interface', intf])
interface = {
'name': intf,
'alt_subnet': [],
'role': 'downstream',
'threshold': '1',
'whitelist': []
}
if conf.exists(['alt-subnet']):
interface['alt_subnet'] = conf.return_values(['alt-subnet'])
if conf.exists(['role']):
interface['role'] = conf.return_value(['role'])
if conf.exists(['threshold']):
interface['threshold'] = conf.return_value(['threshold'])
if conf.exists(['whitelist']):
interface['whitelist'] = conf.return_values(['whitelist'])
# Append interface configuration to global configuration list
igmp_proxy['interfaces'].append(interface)
return igmp_proxy
def verify(igmp_proxy):
# bail out early - looks like removal from running config
if igmp_proxy is None:
return None
# bail out early - service is disabled
if igmp_proxy['disable']:
return None
# at least two interfaces are required, one upstream and one downstream
if len(igmp_proxy['interfaces']) < 2:
raise ConfigError('Must define an upstream and at least 1 downstream interface!')
upstream = 0
for interface in igmp_proxy['interfaces']:
if interface['name'] not in interfaces():
raise ConfigError('Interface "{}" does not exist'.format(interface['name']))
if "upstream" == interface['role']:
upstream += 1
if upstream == 0:
raise ConfigError('At least 1 upstream interface is required!')
elif upstream > 1:
raise ConfigError('Only 1 upstream interface allowed!')
return None
def generate(igmp_proxy):
# bail out early - looks like removal from running config
if igmp_proxy is None:
return None
# bail out early - service is disabled, but inform user
if igmp_proxy['disable']:
print('Warning: IGMP Proxy will be deactivated because it is disabled')
return None
render(config_file, 'igmp-proxy/igmpproxy.conf.tmpl', igmp_proxy)
return None
def apply(igmp_proxy):
if igmp_proxy is None or igmp_proxy['disable']:
# IGMP Proxy support is removed in the commit
call('sudo systemctl stop igmpproxy.service')
if os.path.exists(config_file):
os.unlink(config_file)
else:
call('systemctl restart igmpproxy.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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