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dns_dynamic.py
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dns_dynamic.py
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#!/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
import argparse
import sys
import time
from tabulate import tabulate
from vyos.config import Config
from vyos.template import is_ipv4, is_ipv6
from vyos.utils.process import call
cache_file = r'/run/ddclient/ddclient.cache'
columns = {
'host': 'Hostname',
'ipv4': 'IPv4 address',
'status-ipv4': 'IPv4 status',
'ipv6': 'IPv6 address',
'status-ipv6': 'IPv6 status',
'mtime': 'Last update',
}
def _get_formatted_host_records(host_data):
data_entries = []
for entry in host_data:
data_entries.append([entry.get(key) for key in columns.keys()])
header = columns.values()
output = tabulate(data_entries, header, numalign='left')
return output
def show_status():
# A ddclient status file might not always exist
if not os.path.exists(cache_file):
sys.exit(0)
data = []
with open(cache_file, 'r') as f:
for line in f:
if line.startswith('#'):
continue
props = {}
# ddclient cache rows have properties in 'key=value' format separated by comma
# we pick up the ones we are interested in
for kvraw in line.split(' ')[0].split(','):
k, v = kvraw.split('=')
if k in list(columns.keys()) + ['ip', 'status']: # ip and status are legacy keys
props[k] = v
# Extract IPv4 and IPv6 address and status from legacy keys
# Dual-stack isn't supported in legacy format, 'ip' and 'status' are for one of IPv4 or IPv6
if 'ip' in props:
if is_ipv4(props['ip']):
props['ipv4'] = props['ip']
props['status-ipv4'] = props['status']
elif is_ipv6(props['ip']):
props['ipv6'] = props['ip']
props['status-ipv6'] = props['status']
del props['ip']
# Convert mtime to human readable format
if 'mtime' in props:
props['mtime'] = time.strftime(
"%Y-%m-%d %H:%M:%S", time.localtime(int(props['mtime'], base=10)))
data.append(props)
print(_get_formatted_host_records(data))
def update_ddns():
call('systemctl stop ddclient.service')
if os.path.exists(cache_file):
os.remove(cache_file)
call('systemctl start ddclient.service')
if __name__ == '__main__':
parser = argparse.ArgumentParser()
group = parser.add_mutually_exclusive_group()
group.add_argument("--status", help="Show DDNS status", action="store_true")
group.add_argument("--update", help="Update DDNS on a given interface", action="store_true")
args = parser.parse_args()
# Do nothing if service is not configured
c = Config()
if not c.exists_effective('service dns dynamic'):
print("Dynamic DNS not configured")
sys.exit(1)
if args.status:
show_status()
elif args.update:
update_ddns()

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