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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 netifaces import interfaces
from vyos.base import Warning
from vyos.config import Config
from vyos.configdict import dict_merge
from vyos.template import render
from vyos.util import call
from vyos.util import dict_search
from vyos.xml import defaults
from vyos import ConfigError
from vyos import airbag
airbag.enable()
config_file = r'/etc/igmpproxy.conf'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['protocols', 'igmp-proxy']
igmp_proxy = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
if 'interface' in igmp_proxy:
# T2665: we must add the tagNode defaults individually until this is
# moved to the base class
default_values = defaults(base + ['interface'])
for interface in igmp_proxy['interface']:
igmp_proxy['interface'][interface] = dict_merge(default_values,
igmp_proxy['interface'][interface])
if conf.exists(['protocols', 'igmp']):
igmp_proxy.update({'igmp_configured': ''})
if conf.exists(['protocols', 'pim']):
igmp_proxy.update({'pim_configured': ''})
return igmp_proxy
def verify(igmp_proxy):
# bail out early - looks like removal from running config
if not igmp_proxy or 'disable' in igmp_proxy:
return None
if 'igmp_configured' in igmp_proxy or 'pim_configured' in igmp_proxy:
raise ConfigError('Can not configure both IGMP proxy and PIM '\
'at the same time')
# at least two interfaces are required, one upstream and one downstream
if 'interface' not in igmp_proxy or len(igmp_proxy['interface']) < 2:
raise ConfigError('Must define exactly one upstream and at least one ' \
'downstream interface!')
upstream = 0
for interface, config in igmp_proxy['interface'].items():
if interface not in interfaces():
raise ConfigError(f'Interface "{interface}" does not exist')
if dict_search('role', config) == 'upstream':
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 not igmp_proxy:
return None
# bail out early - service is disabled, but inform user
if 'disable' in igmp_proxy:
Warning('IGMP Proxy will be deactivated because it is disabled')
return None
render(config_file, 'igmp-proxy/igmpproxy.conf.j2', igmp_proxy)
return None
def apply(igmp_proxy):
if not igmp_proxy or 'disable' in igmp_proxy:
# IGMP Proxy support is removed in the commit
call('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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