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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 jinja2 import FileSystemLoader, Environment
from netifaces import interfaces
from vyos.config import Config
from vyos.defaults import directories as vyos_data_dir
from vyos import ConfigError
from vyos.util import call
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
# Prepare Jinja2 template loader from files
tmpl_path = os.path.join(vyos_data_dir['data'], 'templates', 'igmp-proxy')
fs_loader = FileSystemLoader(tmpl_path)
env = Environment(loader=fs_loader)
tmpl = env.get_template('igmpproxy.conf.tmpl')
config_text = tmpl.render(igmp_proxy)
with open(config_file, 'w') as f:
f.write(config_text)
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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