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conntrack_sync.py
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conntrack_sync.py
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#!/usr/bin/env python3
#
# Copyright (C) 2021 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 syslog
import xmltodict
from argparse import ArgumentParser
from vyos.configquery import CliShellApiConfigQuery
from vyos.util import cmd
from vyos.util import run
from vyos.template import render_to_string
conntrackd_bin = '/usr/sbin/conntrackd'
conntrackd_config = '/run/conntrackd/conntrackd.conf'
parser = ArgumentParser(description='Conntrack Sync')
group = parser.add_mutually_exclusive_group()
group.add_argument('--restart', help='Restart connection tracking synchronization service', action='store_true')
group.add_argument('--reset-cache-internal', help='Reset internal cache', action='store_true')
group.add_argument('--reset-cache-external', help='Reset external cache', action='store_true')
group.add_argument('--show-internal', help='Show internal (main) tracking cache', action='store_true')
group.add_argument('--show-external', help='Show external (main) tracking cache', action='store_true')
group.add_argument('--show-internal-expect', help='Show internal (expect) tracking cache', action='store_true')
group.add_argument('--show-external-expect', help='Show external (expect) tracking cache', action='store_true')
def is_configured():
""" Check if conntrack-sync service is configured """
config = CliShellApiConfigQuery()
if not config.exists(['service', 'conntrack-sync']):
print('Service conntrackd-sync not configured!')
exit(1)
def send_bulk_update():
""" send bulk update of internal-cache to other systems """
tmp = run(f'{conntrackd_bin} -C {conntrackd_config} -B')
if tmp > 0:
print('ERROR: failed to send bulk update to other conntrack-sync systems')
def request_sync():
""" request resynchronization with other systems """
tmp = run(f'{conntrackd_bin} -C {conntrackd_config} -n')
if tmp > 0:
print('ERROR: failed to request resynchronization of external cache')
def flush_cache(direction):
""" flush conntrackd cache (internal or external) """
if direction not in ['internal', 'external']:
raise ValueError()
tmp = run(f'{conntrackd_bin} -C {conntrackd_config} -f {direction}')
if tmp > 0:
print('ERROR: failed to clear {direction} cache')
def xml_to_stdout(xml):
out = []
for line in xml.splitlines():
if line == '\n':
continue
parsed = xmltodict.parse(line)
out.append(parsed)
print(render_to_string('conntrackd/conntrackd.op-mode.tmpl', {'data' : out}))
if __name__ == '__main__':
args = parser.parse_args()
syslog.openlog(ident='conntrack-tools', logoption=syslog.LOG_PID,
facility=syslog.LOG_INFO)
if args.restart:
is_configured()
syslog.syslog('Restarting conntrack sync service...')
cmd('systemctl restart conntrackd.service')
# request resynchronization with other systems
request_sync()
# send bulk update of internal-cache to other systems
send_bulk_update()
elif args.reset_cache_external:
is_configured()
syslog.syslog('Resetting external cache of conntrack sync service...')
# flush the external cache
flush_cache('external')
# request resynchronization with other systems
request_sync()
elif args.reset_cache_internal:
is_configured()
syslog.syslog('Resetting internal cache of conntrack sync service...')
# flush the internal cache
flush_cache('internal')
# request resynchronization of internal cache with kernel conntrack table
tmp = run(f'{conntrackd_bin} -C {conntrackd_config} -R')
if tmp > 0:
print('ERROR: failed to resynchronize internal cache with kernel conntrack table')
# send bulk update of internal-cache to other systems
send_bulk_update()
elif args.show_external or args.show_internal or args.show_external_expect or args.show_internal_expect:
is_configured()
opt = ''
if args.show_external:
opt = '-e ct'
elif args.show_external_expect:
opt = '-e expect'
elif args.show_internal:
opt = '-i ct'
elif args.show_internal_expect:
opt = '-i expect'
if args.show_external or args.show_internal:
print('Main Table Entries:')
else:
print('Expect Table Entries:')
out = cmd(f'sudo {conntrackd_bin} -C {conntrackd_config} {opt} -x')
xml_to_stdout(out)
else:
parser.print_help()
exit(1)

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