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-rwxr-xr-xsrc/conf_mode/flow_accounting_conf.py34
-rwxr-xr-xsrc/system/uacctd_stop.py67
2 files changed, 100 insertions, 1 deletions
diff --git a/src/conf_mode/flow_accounting_conf.py b/src/conf_mode/flow_accounting_conf.py
index 81ee39df1..206f513c8 100755
--- a/src/conf_mode/flow_accounting_conf.py
+++ b/src/conf_mode/flow_accounting_conf.py
@@ -28,6 +28,7 @@ from vyos.ifconfig import Section
from vyos.template import render
from vyos.utils.process import call
from vyos.utils.process import cmd
+from vyos.utils.process import run
from vyos.utils.network import is_addr_assigned
from vyos import ConfigError
from vyos import airbag
@@ -116,6 +117,30 @@ def _nftables_config(configured_ifaces, direction, length=None):
cmd(command, raising=ConfigError)
+def _nftables_trigger_setup(operation: str) -> None:
+ """Add a dummy rule to unlock the main pmacct loop with a packet-trigger
+
+ Args:
+ operation (str): 'add' or 'delete' a trigger
+ """
+ # check if a chain exists
+ table_exists = False
+ if run('nft -snj list table ip pmacct') == 0:
+ table_exists = True
+
+ if operation == 'delete' and table_exists:
+ nft_cmd: str = 'nft delete table ip pmacct'
+ cmd(nft_cmd, raising=ConfigError)
+ if operation == 'add' and not table_exists:
+ nft_cmds: list[str] = [
+ 'nft add table ip pmacct',
+ 'nft add chain ip pmacct pmacct_out { type filter hook output priority raw - 50 \\; policy accept \\; }',
+ 'nft add rule ip pmacct pmacct_out oif lo ip daddr 127.0.254.0 counter log group 2 snaplen 1 queue-threshold 0 comment NFLOG_TRIGGER'
+ ]
+ for nft_cmd in nft_cmds:
+ cmd(nft_cmd, raising=ConfigError)
+
+
def get_config(config=None):
if config:
conf = config
@@ -252,7 +277,6 @@ def generate(flow_config):
call('systemctl daemon-reload')
def apply(flow_config):
- action = 'restart'
# Check if flow-accounting was removed and define command
if not flow_config:
_nftables_config([], 'ingress')
@@ -262,6 +286,10 @@ def apply(flow_config):
call(f'systemctl stop {systemd_service}')
if os.path.exists(uacctd_conf_path):
os.unlink(uacctd_conf_path)
+
+ # must be done after systemctl
+ _nftables_trigger_setup('delete')
+
return
# Start/reload flow-accounting daemon
@@ -277,6 +305,10 @@ def apply(flow_config):
else:
_nftables_config([], 'egress')
+ # add a trigger for signal processing
+ _nftables_trigger_setup('add')
+
+
if __name__ == '__main__':
try:
config = get_config()
diff --git a/src/system/uacctd_stop.py b/src/system/uacctd_stop.py
new file mode 100755
index 000000000..7fbac0566
--- /dev/null
+++ b/src/system/uacctd_stop.py
@@ -0,0 +1,67 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2023 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/>.
+
+# Control pmacct daemons in a tricky way.
+# Pmacct has signal processing in a main loop, together with packet
+# processing. Because of this, while it is waiting for packets, it cannot
+# handle the control signal. We need to start the systemctl command and then
+# send some packets to pmacct to wake it up
+
+from argparse import ArgumentParser
+from socket import socket
+from sys import exit
+from time import sleep
+
+from psutil import Process
+
+
+def stop_process(pid: int, timeout: int) -> None:
+ """Send a signal to uacctd
+ and then send packets to special address predefined in a firewall
+ to unlock main loop in uacctd and finish the process properly
+
+ Args:
+ pid (int): uacctd PID
+ timeout (int): seconds to wait for a process end
+ """
+ # find a process
+ uacctd = Process(pid)
+ uacctd.terminate()
+
+ # create a socket
+ trigger = socket()
+
+ first_cycle: bool = True
+ while uacctd.is_running() and timeout:
+ trigger.sendto(b'WAKEUP', ('127.0.254.0', 0))
+ # do not sleep during first attempt
+ if not first_cycle:
+ sleep(1)
+ timeout -= 1
+ first_cycle = False
+
+
+if __name__ == '__main__':
+ parser = ArgumentParser()
+ parser.add_argument('process_id',
+ type=int,
+ help='PID file of uacctd core process')
+ parser.add_argument('timeout',
+ type=int,
+ help='time to wait for process end')
+ args = parser.parse_args()
+ stop_process(args.process_id, args.timeout)
+ exit()