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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 vyos.config import Config
from vyos.ifconfig import Interface
from vyos.template import render
from vyos.template import is_ipv6
from vyos.utils.process import call
from vyos.utils.network import is_ipv6_link_local
from vyos import ConfigError
from vyos import airbag
airbag.enable()
config_file = '/run/dhcp-relay/dhcrelay6.conf'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['service', 'dhcpv6-relay']
if not conf.exists(base):
return None
relay = conf.get_config_dict(base, key_mangling=('-', '_'),
get_first_key=True,
with_recursive_defaults=True)
return relay
def verify(relay):
# bail out early - looks like removal from running config
if not relay or 'disable' in relay:
return None
if 'upstream_interface' not in relay:
raise ConfigError('At least one upstream interface required!')
for interface, config in relay['upstream_interface'].items():
if 'address' not in config:
raise ConfigError('DHCPv6 server required for upstream ' \
f'interface {interface}!')
if 'listen_interface' not in relay:
raise ConfigError('At least one listen interface required!')
# DHCPv6 relay requires at least one global unicat address assigned to the
# interface
for interface in relay['listen_interface']:
has_global = False
for addr in Interface(interface).get_addr():
if is_ipv6(addr) and not is_ipv6_link_local(addr):
has_global = True
if not has_global:
raise ConfigError(f'Interface {interface} does not have global '\
'IPv6 address assigned!')
return None
def generate(relay):
# bail out early - looks like removal from running config
if not relay or 'disable' in relay:
return None
render(config_file, 'dhcp-relay/dhcrelay6.conf.j2', relay)
return None
def apply(relay):
# bail out early - looks like removal from running config
service_name = 'isc-dhcp-relay6.service'
if not relay or 'disable' in relay:
# DHCPv6 relay support is removed in the commit
call(f'systemctl stop {service_name}')
if os.path.exists(config_file):
os.unlink(config_file)
return None
call(f'systemctl restart {service_name}')
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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