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dhcpv6_relay.py
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dhcpv6_relay.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 vyos.config import Config
from vyos.defaults import directories as vyos_data_dir
from vyos import ConfigError
config_file = r'/etc/default/isc-dhcpv6-relay'
default_config_data = {
'listen_addr': [],
'upstream_addr': [],
'options': [],
}
def get_config():
relay = deepcopy(default_config_data)
conf = Config()
if not conf.exists('service dhcpv6-relay'):
return None
else:
conf.set_level('service dhcpv6-relay')
# Network interfaces/address to listen on for DHCPv6 query(s)
if conf.exists('listen-interface'):
interfaces = conf.list_nodes('listen-interface')
for intf in interfaces:
if conf.exists('listen-interface {0} address'.format(intf)):
addr = conf.return_value('listen-interface {0} address'.format(intf))
listen = addr + '%' + intf
relay['listen_addr'].append(listen)
# Upstream interface/address for remote DHCPv6 server
if conf.exists('upstream-interface'):
interfaces = conf.list_nodes('upstream-interface')
for intf in interfaces:
addresses = conf.return_values('upstream-interface {0} address'.format(intf))
for addr in addresses:
server = addr + '%' + intf
relay['upstream_addr'].append(server)
# Maximum hop count. When forwarding packets, dhcrelay discards packets
# which have reached a hop count of COUNT. Default is 10. Maximum is 255.
if conf.exists('max-hop-count'):
count = '-c ' + conf.return_value('max-hop-count')
relay['options'].append(count)
if conf.exists('use-interface-id-option'):
relay['options'].append('-I')
return relay
def verify(relay):
# bail out early - looks like removal from running config
if relay is None:
return None
if len(relay['listen_addr']) == 0 or len(relay['upstream_addr']) == 0:
raise ConfigError('Must set at least one listen and upstream interface addresses.')
return None
def generate(relay):
# bail out early - looks like removal from running config
if relay is None:
return None
# Prepare Jinja2 template loader from files
tmpl_path = os.path.join(vyos_data_dir['data'], 'templates', 'dhcpv6-relay')
fs_loader = FileSystemLoader(tmpl_path)
env = Environment(loader=fs_loader)
tmpl = env.get_template('config.tmpl')
config_text = tmpl.render(relay)
with open(config_file, 'w') as f:
f.write(config_text)
return None
def apply(relay):
if relay is not None:
os.system('sudo systemctl restart isc-dhcpv6-relay.service')
else:
# DHCPv6 relay support is removed in the commit
os.system('sudo systemctl stop isc-dhcpv6-relay.service')
os.unlink(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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dhcpv6_relay.py (3 KB)

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