#!/usr/bin/env python3 # # Copyright (C) 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 ipaddress import IPv4Address from sys import exit from vyos import ConfigError from vyos.config import Config from vyos.util import call, process_named_running from vyos.template import render from signal import SIGTERM from vyos import airbag airbag.enable() # Required to use the full path to pimd, in another case daemon will not be started pimd_cmd = f'/usr/lib/frr/pimd -d -F traditional --daemon -A 127.0.0.1' config_file = r'/tmp/igmp.frr' def get_config(config=None): if config: conf = config else: conf = Config() igmp_conf = { 'igmp_conf' : False, 'pim_conf' : False, 'igmp_proxy_conf' : False, 'old_ifaces' : {}, 'ifaces' : {} } if not (conf.exists('protocols igmp') or conf.exists_effective('protocols igmp')): return None if conf.exists('protocols igmp-proxy'): igmp_conf['igmp_proxy_conf'] = True if conf.exists('protocols pim'): igmp_conf['pim_conf'] = True if conf.exists('protocols igmp'): igmp_conf['igmp_conf'] = True conf.set_level('protocols igmp') # # Get interfaces for iface in conf.list_effective_nodes('interface'): igmp_conf['old_ifaces'].update({ iface : { 'version' : conf.return_effective_value('interface {0} version'.format(iface)), 'query_interval' : conf.return_effective_value('interface {0} query-interval'.format(iface)), 'query_max_resp_time' : conf.return_effective_value('interface {0} query-max-response-time'.format(iface)), 'gr_join' : {} } }) for gr_join in conf.list_effective_nodes('interface {0} join'.format(iface)): igmp_conf['old_ifaces'][iface]['gr_join'][gr_join] = conf.return_effective_values('interface {0} join {1} source'.format(iface, gr_join)) for iface in conf.list_nodes('interface'): igmp_conf['ifaces'].update({ iface : { 'version' : conf.return_value('interface {0} version'.format(iface)), 'query_interval' : conf.return_value('interface {0} query-interval'.format(iface)), 'query_max_resp_time' : conf.return_value('interface {0} query-max-response-time'.format(iface)), 'gr_join' : {} } }) for gr_join in conf.list_nodes('interface {0} join'.format(iface)): igmp_conf['ifaces'][iface]['gr_join'][gr_join] = conf.return_values('interface {0} join {1} source'.format(iface, gr_join)) return igmp_conf def verify(igmp): if igmp is None: return None if igmp['igmp_conf']: # Check conflict with IGMP-Proxy if igmp['igmp_proxy_conf']: raise ConfigError(f"IGMP proxy and PIM cannot be both configured at the same time") # Check interfaces if not igmp['ifaces']: raise ConfigError(f"IGMP require defined interfaces!") # Check, is this multicast group for intfc in igmp['ifaces']: for gr_addr in igmp['ifaces'][intfc]['gr_join']: if IPv4Address(gr_addr) < IPv4Address('224.0.0.0'): raise ConfigError(gr_addr + " not a multicast group") def generate(igmp): if igmp is None: return None render(config_file, 'frr/igmp.frr.tmpl', igmp) return None def apply(igmp): if igmp is None: return None pim_pid = process_named_running('pimd') if igmp['igmp_conf'] or igmp['pim_conf']: if not pim_pid: call(pimd_cmd) if os.path.exists(config_file): call(f'vtysh -d pimd -f {config_file}') os.remove(config_file) elif pim_pid: os.kill(int(pim_pid), SIGTERM) return None if __name__ == '__main__': try: c = get_config() verify(c) generate(c) apply(c) except ConfigError as e: print(e) exit(1)