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#!/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
from vyos.template import render
from vyos import airbag
airbag.enable()
config_file = r'/tmp/static_mcast.frr'
# Get configuration for static multicast route
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
mroute = {
'old_mroute' : {},
'mroute' : {}
}
base_path = "protocols static multicast"
if not (conf.exists(base_path) or conf.exists_effective(base_path)):
return None
conf.set_level(base_path)
# Get multicast effective routes
for route in conf.list_effective_nodes('route'):
mroute['old_mroute'][route] = {}
for next_hop in conf.list_effective_nodes('route {0} next-hop'.format(route)):
mroute['old_mroute'][route].update({
next_hop : conf.return_value('route {0} next-hop {1} distance'.format(route, next_hop))
})
# Get multicast effective interface-routes
for route in conf.list_effective_nodes('interface-route'):
if not route in mroute['old_mroute']:
mroute['old_mroute'][route] = {}
for next_hop in conf.list_effective_nodes('interface-route {0} next-hop-interface'.format(route)):
mroute['old_mroute'][route].update({
next_hop : conf.return_value('interface-route {0} next-hop-interface {1} distance'.format(route, next_hop))
})
# Get multicast routes
for route in conf.list_nodes('route'):
mroute['mroute'][route] = {}
for next_hop in conf.list_nodes('route {0} next-hop'.format(route)):
mroute['mroute'][route].update({
next_hop : conf.return_value('route {0} next-hop {1} distance'.format(route, next_hop))
})
# Get multicast interface-routes
for route in conf.list_nodes('interface-route'):
if not route in mroute['mroute']:
mroute['mroute'][route] = {}
for next_hop in conf.list_nodes('interface-route {0} next-hop-interface'.format(route)):
mroute['mroute'][route].update({
next_hop : conf.return_value('interface-route {0} next-hop-interface {1} distance'.format(route, next_hop))
})
return mroute
def verify(mroute):
if mroute is None:
return None
for route in mroute['mroute']:
route = route.split('/')
if IPv4Address(route[0]) < IPv4Address('224.0.0.0'):
raise ConfigError(route + " not a multicast network")
def generate(mroute):
if mroute is None:
return None
render(config_file, 'frr/static_mcast.frr.tmpl', mroute)
return None
def apply(mroute):
if mroute is None:
return None
if os.path.exists(config_file):
call(f'vtysh -d staticd -f {config_file}')
os.remove(config_file)
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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