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#!/bin/bash
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
IPSEC_CONF="/etc/ipsec.conf"
IPSEC_SECRETS="/etc/ipsec.secrets"
def getlines(file):
with open(file, 'r') as f:
return f.readlines()
def writelines(file, lines):
with open(file, 'w') as f:
f.writelines(lines)
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 = getlines(IPSEC_CONF)
secrets_lines = getlines(IPSEC_SECRETS)
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:
writelines(IPSEC_CONF, conf_lines)
writelines(IPSEC_SECRETS, secrets_lines)
ipsec_down(old_ip)
call('sudo /usr/sbin/ipsec rereadall')
call('sudo /usr/sbin/ipsec reload')
PYEND
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