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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 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'
default_config_data = {
'servers': [],
'allowed_networks': [],
'listen_address': []
}
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)
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')
for n in ntp['allowed_networks']:
try:
addr = ip_network( n['network'] )
break
except ValueError:
raise ConfigError('{network} does not appear to be a valid IPv4 or IPv6 network, '
'check host bits!'.format(**n))
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)
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)
else:
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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