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#!/usr/bin/env python3
#
# Copyright (C) 2024 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 json
import sys
from tabulate import tabulate
import vyos.opmode
from vyos.configquery import ConfigTreeQuery
from vyos.utils.process import cmd
CGNAT_TABLE = 'cgnat'
def _get_raw_data():
""" Get CGNAT dictionary
"""
cmd_output = cmd(f'nft --json list table ip {CGNAT_TABLE}')
data = json.loads(cmd_output)
return data
def _get_formatted_output(data):
elements = data['nftables'][2]['map']['elem']
allocations = []
for elem in elements:
internal = elem[0] # internal
external = elem[1]['concat'][0] # external
start_port = elem[1]['concat'][1]['range'][0]
end_port = elem[1]['concat'][1]['range'][1]
port_range = f'{start_port}-{end_port}'
allocations.append((internal, external, port_range))
headers = ['Internal IP', 'External IP', 'Port range']
output = tabulate(allocations, headers, numalign="left")
return output
def show_allocation(raw: bool):
config = ConfigTreeQuery()
if not config.exists('nat cgnat'):
raise vyos.opmode.UnconfiguredSubsystem('CGNAT is not configured')
if raw:
return _get_raw_data()
else:
raw_data = _get_raw_data()
return _get_formatted_output(raw_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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