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#!/usr/bin/env python3
#
# Copyright 2023-2025 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
import sys
from time import sleep
from vyos.config import Config
from vyos.ifconfig import Section
from vyos.utils.boot import boot_configuration_complete
from vyos.utils.process import cmd
from vyos.utils.process import is_systemd_service_active
from vyos.utils.commit import commit_in_progress
from vyos import airbag
airbag.enable()
if len(sys.argv) < 3:
airbag.noteworthy('Must specify both interface and link status!')
sys.exit(1)
if not boot_configuration_complete():
airbag.noteworthy('System bootup not yet finished...')
sys.exit(1)
interface = sys.argv[1]
while commit_in_progress():
sleep(0.250)
in_out = sys.argv[2]
config = Config()
interface_path = ['interfaces'] + Section.get_config_path(interface).split()
systemdV4_service = f'dhclient@{interface}.service'
systemdV6_service = f'dhcp6c@{interface}.service'
if in_out == 'out':
# Interface moved state to down
if is_systemd_service_active(systemdV4_service):
cmd(f'systemctl stop {systemdV4_service}')
if is_systemd_service_active(systemdV6_service):
cmd(f'systemctl stop {systemdV6_service}')
elif in_out == 'in':
if config.exists_effective(interface_path + ['address']):
tmp = config.return_effective_values(interface_path + ['address'])
# Always (re-)start the DHCP(v6) client service. If the DHCP(v6) client
# is already running - which could happen if the interface is re-
# configured in operational down state, it will have a backoff
# time increasing while not receiving a DHCP(v6) reply.
#
# To make the interface instantly available, and as for a DHCP(v6) lease
# we will re-start the service and thus cancel the backoff time.
if 'dhcp' in tmp:
cmd(f'systemctl restart {systemdV4_service}')
if 'dhcpv6' in tmp:
cmd(f'systemctl restart {systemdV6_service}')
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