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service_ntp.py
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service_ntp.py
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#!/usr/bin/env python3
#
# Copyright (C) 2018-2024 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 vyos.config import Config
from vyos.configdict import is_node_changed
from vyos.configverify import verify_vrf
from vyos.configverify import verify_interface_exists
from vyos.utils.process import call
from vyos.utils.permission import chmod_750
from vyos.utils.network import get_interface_config
from vyos.template import render
from vyos.template import is_ipv4
from vyos import ConfigError
from vyos import airbag
airbag.enable()
config_file = r'/run/chrony/chrony.conf'
systemd_override = r'/run/systemd/system/chrony.service.d/override.conf'
user_group = '_chrony'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['service', 'ntp']
if not conf.exists(base):
return None
ntp = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True, with_defaults=True)
ntp['config_file'] = config_file
ntp['user'] = user_group
tmp = is_node_changed(conf, base + ['vrf'])
if tmp: ntp.update({'restart_required': {}})
return ntp
def verify(ntp):
# bail out early - looks like removal from running config
if not ntp:
return None
if 'server' not in ntp:
raise ConfigError('NTP server not configured')
verify_vrf(ntp)
if 'interface' in ntp:
# If ntpd should listen on a given interface, ensure it exists
interface = ntp['interface']
verify_interface_exists(interface)
# If we run in a VRF, our interface must belong to this VRF, too
if 'vrf' in ntp:
tmp = get_interface_config(interface)
vrf_name = ntp['vrf']
if 'master' not in tmp or tmp['master'] != vrf_name:
raise ConfigError(f'NTP runs in VRF "{vrf_name}" - "{interface}" '\
f'does not belong to this VRF!')
if 'listen_address' in ntp:
ipv4_addresses = 0
ipv6_addresses = 0
for address in ntp['listen_address']:
if is_ipv4(address):
ipv4_addresses += 1
else:
ipv6_addresses += 1
if ipv4_addresses > 1:
raise ConfigError(f'NTP Only admits one ipv4 value for listen-address parameter ')
if ipv6_addresses > 1:
raise ConfigError(f'NTP Only admits one ipv6 value for listen-address parameter ')
return None
def generate(ntp):
# bail out early - looks like removal from running config
if not ntp:
return None
render(config_file, 'chrony/chrony.conf.j2', ntp, user=user_group, group=user_group)
render(systemd_override, 'chrony/override.conf.j2', ntp, user=user_group, group=user_group)
# Ensure proper permission for chrony command socket
config_dir = os.path.dirname(config_file)
chmod_750(config_dir)
return None
def apply(ntp):
systemd_service = 'chrony.service'
# Reload systemd manager configuration
call('systemctl daemon-reload')
if not ntp:
# NTP support is removed in the commit
call(f'systemctl stop {systemd_service}')
if os.path.exists(config_file):
os.unlink(config_file)
if os.path.isfile(systemd_override):
os.unlink(systemd_override)
return
# we need to restart the service if e.g. the VRF name changed
systemd_action = 'reload-or-restart'
if 'restart_required' in ntp:
systemd_action = 'restart'
call(f'systemctl {systemd_action} {systemd_service}')
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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