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cgnat.py
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cgnat.py
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#!/usr/bin/env python3
#
# Copyright VyOS maintainers and contributors <maintainers@vyos.io>
#
# 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
import typing
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(external_address: str = '', internal_address: str = '') -> list[dict]:
"""Get CGNAT dictionary and filter by external or internal address if provided."""
cmd_output = cmd(f'nft --json list table ip {CGNAT_TABLE}')
data = json.loads(cmd_output)
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}'
if (internal_address and internal != internal_address) or (
external_address and external != external_address
):
continue
allocations.append(
{
'internal_address': internal,
'external_address': external,
'port_range': port_range,
}
)
return allocations
def _get_formatted_output(allocations: list[dict]) -> str:
# Convert the list of dictionaries to a list of tuples for tabulate
headers = ['Internal IP', 'External IP', 'Port range']
data = [
(alloc['internal_address'], alloc['external_address'], alloc['port_range'])
for alloc in allocations
]
output = tabulate(data, headers, numalign="left")
return output
def show_allocation(
raw: bool,
external_address: typing.Optional[str],
internal_address: typing.Optional[str],
) -> str:
config = ConfigTreeQuery()
if not config.exists('nat cgnat'):
raise vyos.opmode.UnconfiguredSubsystem('CGNAT is not configured')
if raw:
return _get_raw_data(external_address, internal_address)
else:
raw_data = _get_raw_data(external_address, internal_address)
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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