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ntp.py
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ntp.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 copy import deepcopy
from ipaddress import ip_network
from netifaces import interfaces
from sys import exit
from vyos.config import Config
from vyos.util import call
from vyos.template import render
from vyos import ConfigError
from vyos import airbag
airbag.enable()
config_file = r'/etc/ntp.conf'
systemd_override = r'/etc/systemd/system/ntp.service.d/override.conf'
default_config_data = {
'servers': [],
'allowed_networks': [],
'listen_address': [],
'vrf': ''
}
def get_config():
ntp = deepcopy(default_config_data)
conf = Config()
base = ['system', 'ntp']
if not conf.exists(base):
return None
else:
conf.set_level(base)
node = ['allow-clients', 'address']
if conf.exists(node):
networks = conf.return_values(node)
for n in networks:
addr = ip_network(n)
net = {
"network" : n,
"address" : addr.network_address,
"netmask" : addr.netmask
}
ntp['allowed_networks'].append(net)
node = ['listen-address']
if conf.exists(node):
ntp['listen_address'] = conf.return_values(node)
node = ['server']
if conf.exists(node):
for node in conf.list_nodes(node):
options = []
server = {
"name": node,
"options": []
}
if conf.exists('server {0} noselect'.format(node)):
options.append('noselect')
if conf.exists('server {0} preempt'.format(node)):
options.append('preempt')
if conf.exists('server {0} prefer'.format(node)):
options.append('prefer')
server['options'] = options
ntp['servers'].append(server)
node = ['vrf']
if conf.exists(node):
ntp['vrf'] = conf.return_value(node)
return ntp
def verify(ntp):
# bail out early - looks like removal from running config
if not ntp:
return None
# Configuring allowed clients without a server makes no sense
if len(ntp['allowed_networks']) and not len(ntp['servers']):
raise ConfigError('NTP server not configured')
if ntp['vrf'] and ntp['vrf'] not in interfaces():
raise ConfigError('VRF "{vrf}" does not exist'.format(**ntp))
return None
def generate(ntp):
# bail out early - looks like removal from running config
if not ntp:
return None
render(config_file, 'ntp/ntp.conf.tmpl', ntp)
render(systemd_override, 'ntp/override.conf.tmpl', ntp, trim_blocks=True)
return None
def apply(ntp):
if not ntp:
# NTP support is removed in the commit
call('systemctl stop ntp.service')
if os.path.exists(config_file):
os.unlink(config_file)
if os.path.isfile(systemd_override):
os.unlink(systemd_override)
# Reload systemd manager configuration
call('systemctl daemon-reload')
if ntp:
call('systemctl restart ntp.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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