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vyos-config-ntp.py
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vyos-config-ntp.py
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#!/usr/bin/env python3
#
# Copyright (C) 2018 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 sys
import os
import time
import socket
import ipaddress
from vyos.config import Config
from vyos.util import ConfigError
config_file = r'/etc/ntp.conf'
def get_config():
ntp = {}
conf = Config()
conf.set_level('system ntp')
if not conf.exists(''):
return ntp
if conf.exists('allow-clients address'):
ntp.setdefault('allow-networks', [])
networks = []
networks = conf.return_values('allow-clients address')
for network in networks:
ntp['allow-networks'].append(network)
if conf.exists('server'):
ntp.setdefault('servers', [])
for node in conf.list_nodes('server'):
server = {
"name": node,
"dynamic": False,
"noselect": False,
"preempt": False,
"prefer": False,
}
if conf.exists('server {0} dynamic'.format(node)):
server['dynamic'] = True
if conf.exists('server {0} noselect'.format(node)):
server['noselect'] = True
if conf.exists('server {0} preempt'.format(node)):
server['preempt'] = True
if conf.exists('server {0} prefer'.format(node)):
server['prefer'] = True
ntp['servers'].append(server)
return ntp
def verify(ntp):
if 'allow-networks' in ntp.keys():
for network in ntp['allow-networks']:
try:
addr = ipaddress.ip_network(network)
except ValueError:
raise ConfigError("{0} does not appear to be a valid IPv4 or IPv6 network, check host bits.".format(network))
return None
def generate(ntp):
config_header = '### Autogenerated by vyos-config-ntp.py on {tm} ###\n'.format(tm=time.strftime("%a, %d %b %Y %H:%M:%S", time.localtime()))
# write new configuration file
f = open(config_file, 'w')
f.write(config_header)
f.write('driftfile /var/lib/ntp/ntp.drift\n')
f.write('# By default, only allow ntpd to query time sources, ignore any\n')
f.write('# incoming requests.\n')
f.write('restrict default ignore\n')
f.write('\n')
f.write('# Local users have unrestricted access, allowing reconfiguration\n')
f.write('# via ntpdc\n')
f.write('restrict 127.0.0.1\n')
f.write('restrict -6 ::1\n')
f.write('\n')
if 'servers' in ntp.keys():
for server in ntp['servers']:
addr = socket.gethostbyname(server['name'])
opt = ['dynamic', 'noselect', 'preempt', 'prefer']
f.write('# Server configuration {0}\n'.format(server['name']))
f.write('server {0} iburst {1}\n'.format(addr, '{0}'.format(' '.join(str(o) for o in opt if server[o]))))
f.write('restrict {0} nomodify notrap nopeer noquery\n'.format(addr))
f.write('\n')
if 'allow-networks' in ntp.keys():
for network in ntp['allow-networks']:
addr = ipaddress.ip_network(network)
f.write('# Client configuration: {0}\n'.format(network))
f.write('restrict {0} mask {1} nomodify notrap nopeer\n'.format(addr.network_address, addr.netmask))
f.write('\n')
f.close()
return None
def apply(ntp):
if len(ntp) == 0:
cmd = "sudo /usr/sbin/invoke-rc.d ntp stop"
else:
cmd = "sudo /usr/sbin/invoke-rc.d ntp force-reload"
os.system(cmd)
return None
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
sys.exit(1)

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