#!/usr/bin/env python3 # # Copyright (C) 2018-2023 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) 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)