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dynamic_dns.py
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dynamic_dns.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
import argparse
import jinja2
import sys
import time
from vyos.config import Config
from vyos.util import call
cache_file = r'/run/ddclient/ddclient.cache'
OUT_TMPL_SRC = """
{% for entry in hosts %}
ip address : {{ entry.ip }}
host-name : {{ entry.host }}
last update : {{ entry.time }}
update-status: {{ entry.status }}
{% endfor %}
"""
def show_status():
data = {
'hosts': []
}
with open(cache_file, 'r') as f:
for line in f:
if line.startswith('#'):
continue
outp = {
'host': '',
'ip': '',
'time': ''
}
if 'host=' in line:
host = line.split('host=')[1]
if host:
outp['host'] = host.split(',')[0]
if 'ip=' in line:
ip = line.split('ip=')[1]
if ip:
outp['ip'] = ip.split(',')[0]
if 'atime=' in line:
atime = line.split('atime=')[1]
if atime:
tmp = atime.split(',')[0]
outp['time'] = time.strftime("%Y-%m-%d %H:%M:%S", time.gmtime(int(tmp, base=10)))
if 'status=' in line:
status = line.split('status=')[1]
if status:
outp['status'] = status.split(',')[0]
data['hosts'].append(outp)
tmpl = jinja2.Template(OUT_TMPL_SRC)
print(tmpl.render(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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