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dns.py
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dns.py
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#!/usr/bin/env python3
#
# Copyright (C) 2022 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
from sys import exit
from tabulate import tabulate
from vyos.configquery import ConfigTreeQuery
from vyos.util import cmd
import vyos.opmode
def _data_to_dict(data, sep="\t") -> dict:
"""
Return dictionary from plain text
separated by tab
cache-entries 73
cache-hits 0
uptime 2148
user-msec 172
{
'cache-entries': '73',
'cache-hits': '0',
'uptime': '2148',
'user-msec': '172'
}
"""
dictionary = {}
mylist = [line for line in data.split('\n')]
for line in mylist:
if sep in line:
key, value = line.split(sep)
dictionary[key] = value
return dictionary
def _get_raw_forwarding_statistics() -> dict:
command = cmd('sudo /usr/bin/rec_control --socket-dir=/run/powerdns get-all')
data = _data_to_dict(command)
data['cache-size'] = "{0:.2f}".format( int(
cmd('sudo /usr/bin/rec_control --socket-dir=/run/powerdns get cache-bytes')) / 1024 )
return data
def _get_formatted_forwarding_statistics(data):
cache_entries = data.get('cache-entries')
max_cache_entries = data.get('max-cache-entries')
cache_size = data.get('cache-size')
data_entries = [[cache_entries, max_cache_entries, f'{cache_size} kbytes']]
headers = ["Cache entries", "Max cache entries" , "Cache size"]
output = tabulate(data_entries, headers, numalign="left")
return output
def show_forwarding_statistics(raw: bool):
config = ConfigTreeQuery()
if not config.exists('service dns forwarding'):
print("DNS forwarding is not configured")
exit(0)
dns_data = _get_raw_forwarding_statistics()
if raw:
return dns_data
else:
return _get_formatted_forwarding_statistics(dns_data)
if __name__ == '__main__':
try:
res = vyos.opmode.run(sys.modules[__name__])
if res:
print(res)
except (ValueError, vyos.opmode.Error) as e:
print(e)
sys.exit(1)

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