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#!/usr/bin/env python3
#
# Copyright (C) 2018 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 os
from psutil import pid_exists
from subprocess import Popen, PIPE
from time import sleep
from netifaces import interfaces
def get_config_name(intf):
cfg_file = r'/opt/vyatta/etc/openvpn/openvpn-{}.conf'.format(intf)
return cfg_file
def get_pid_file(intf):
pid_file = r'/var/run/openvpn/{}.pid'.format(intf)
return pid_file
def subprocess_cmd(command):
p = Popen(command, stdout=PIPE, shell=True)
p.communicate()
if __name__ == '__main__':
if (len(sys.argv) < 1):
print("Must specify OpenVPN interface name!")
sys.exit(1)
interface = sys.argv[1]
if os.path.isfile(get_config_name(interface)):
pidfile = '/var/run/openvpn/{}.pid'.format(interface)
if os.path.isfile(pidfile):
pid = 0
with open(pidfile, 'r') as f:
pid = int(f.read())
if pid_exists(pid):
cmd = 'start-stop-daemon --stop --quiet'
cmd += ' --pidfile ' + pidfile
subprocess_cmd(cmd)
# When stopping OpenVPN we need to wait for the 'old' interface to
# vanish from the Kernel, if it is not gone, OpenVPN will report:
# ERROR: Cannot ioctl TUNSETIFF vtun10: Device or resource busy (errno=16)
while interface in interfaces():
sleep(0.250) # 250ms
# re-start OpenVPN process
cmd = 'start-stop-daemon --start --quiet'
cmd += ' --pidfile ' + get_pid_file(interface)
cmd += ' --exec /usr/sbin/openvpn'
# now pass arguments to openvpn binary
cmd += ' --'
cmd += ' --config ' + get_config_name(interface)
subprocess_cmd(cmd)
else:
print("OpenVPN interface {} does not exist!".format(interface))
sys.exit(1)
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