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#!/bin/bash
#
# 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/>.
if [ "$reason" == "REBOOT" ] || [ "$reason" == "EXPIRE" ]; then
exit 0
fi
DHCP_HOOK_IFLIST="/tmp/ipsec_dhcp_waiting"
if [ -f $DHCP_HOOK_IFLIST ] && [ "$reason" == "BOUND" ]; then
if grep -qw $interface $DHCP_HOOK_IFLIST; then
sudo rm $DHCP_HOOK_IFLIST
sudo python3 /usr/libexec/vyos/conf_mode/vpn_ipsec.py
exit 0
fi
fi
if [ "$old_ip_address" == "$new_ip_address" ] && [ "$reason" == "BOUND" ]; then
exit 0
fi
python3 - <<PYEND
import os
import re
from vyos.util import call
from vyos.util import cmd
from vyos.util import read_file
from vyos.util import write_file
SWANCTL_CONF="/etc/swanctl/swanctl.conf"
def ipsec_down(ip_address):
# This prevents the need to restart ipsec and kill all active connections, only the stale connection is closed
status = cmd('sudo ipsec statusall')
connection_name = None
for line in status.split("\n"):
if line.find(ip_address) > 0:
regex_match = re.search(r'(peer_[^:\[]+)', line)
if regex_match:
connection_name = regex_match[1]
break
if connection_name:
call(f'sudo ipsec down {connection_name}')
if __name__ == '__main__':
interface = os.getenv('interface')
new_ip = os.getenv('new_ip_address')
old_ip = os.getenv('old_ip_address')
conf_lines = read_file(SWANCTL_CONF)
found = False
to_match = f'# dhcp:{interface}'
for i, line in enumerate(conf_lines):
if line.find(to_match) > 0:
conf_lines[i] = line.replace(old_ip, new_ip)
found = True
for i, line in enumerate(secrets_lines):
if line.find(to_match) > 0:
secrets_lines[i] = line.replace(old_ip, new_ip)
if found:
write_file(SWANCTL_CONF, conf_lines)
ipsec_down(old_ip)
call('sudo ipsec rereadall')
call('sudo ipsec reload')
call('sudo swanctl -q')
exit(0)
PYEND
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