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conntrack.py
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conntrack.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
import xmltodict
from tabulate import tabulate
from vyos.util import cmd
from vyos.util import run
import vyos.opmode
def _get_xml_data(family):
"""
Get conntrack XML output
"""
return cmd(f'sudo conntrack --dump --family {family} --output xml')
def _xml_to_dict(xml):
"""
Convert XML to dictionary
Return: dictionary
"""
parse = xmltodict.parse(xml, attr_prefix='')
# If only one conntrack entry we must change dict
if 'meta' in parse['conntrack']['flow']:
return dict(conntrack={'flow': [parse['conntrack']['flow']]})
return parse
def _get_raw_data(family):
"""
Return: dictionary
"""
xml = _get_xml_data(family)
return _xml_to_dict(xml)
def get_formatted_output(dict_data):
"""
:param xml:
:return: formatted output
"""
data_entries = []
#dict_data = _get_raw_data(family)
for entry in dict_data['conntrack']['flow']:
orig_src, orig_dst, orig_sport, orig_dport = {}, {}, {}, {}
reply_src, reply_dst, reply_sport, reply_dport = {}, {}, {}, {}
proto = {}
for meta in entry['meta']:
direction = meta['direction']
if direction in ['original']:
if 'layer3' in meta:
orig_src = meta['layer3']['src']
orig_dst = meta['layer3']['dst']
if 'layer4' in meta:
if meta.get('layer4').get('sport'):
orig_sport = meta['layer4']['sport']
if meta.get('layer4').get('dport'):
orig_dport = meta['layer4']['dport']
proto = meta['layer4']['protoname']
if direction in ['reply']:
if 'layer3' in meta:
reply_src = meta['layer3']['src']
reply_dst = meta['layer3']['dst']
if 'layer4' in meta:
if meta.get('layer4').get('sport'):
reply_sport = meta['layer4']['sport']
if meta.get('layer4').get('dport'):
reply_dport = meta['layer4']['dport']
proto = meta['layer4']['protoname']
if direction == 'independent':
conn_id = meta['id']
timeout = meta['timeout']
orig_src = f'{orig_src}:{orig_sport}' if orig_sport else orig_src
orig_dst = f'{orig_dst}:{orig_dport}' if orig_dport else orig_dst
reply_src = f'{reply_src}:{reply_sport}' if reply_sport else reply_src
reply_dst = f'{reply_dst}:{reply_dport}' if reply_dport else reply_dst
state = meta['state'] if 'state' in meta else ''
mark = meta['mark']
zone = meta['zone'] if 'zone' in meta else ''
data_entries.append(
[conn_id, orig_src, orig_dst, reply_src, reply_dst, proto, state, timeout, mark, zone])
headers = ["Id", "Original src", "Original dst", "Reply src", "Reply dst", "Protocol", "State", "Timeout", "Mark",
"Zone"]
output = tabulate(data_entries, headers, numalign="left")
return output
def show(raw: bool, family: str):
family = 'ipv6' if family == 'inet6' else 'ipv4'
conntrack_data = _get_raw_data(family)
if raw:
return conntrack_data
else:
return get_formatted_output(conntrack_data)
if __name__ == '__main__':
try:
res = vyos.opmode.run(sys.modules[__name__])
if res:
print(res)
except ValueError as e:
print(e)
sys.exit(1)

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