conntrack-sync: T3535: Rewrite conf and op modes to XML python style

1 files changed, 136 insertions, 0 deletions

diff --git a/src/op_mode/conntrack_sync.py b/src/op_mode/conntrack_sync.py
new file mode 100755
index 000000000..66ecf8439
--- /dev/null
+++ b/src/op_mode/conntrack_sync.py
@@ -0,0 +1,136 @@
+#!/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)