diff options
Diffstat (limited to 'src/etc/dhcp/dhclient-exit-hooks.d/ipsec-dhclient-hook')
| -rwxr-xr-x | src/etc/dhcp/dhclient-exit-hooks.d/ipsec-dhclient-hook | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/src/etc/dhcp/dhclient-exit-hooks.d/ipsec-dhclient-hook b/src/etc/dhcp/dhclient-exit-hooks.d/ipsec-dhclient-hook new file mode 100755 index 000000000..a7a9a2ce6 --- /dev/null +++ b/src/etc/dhcp/dhclient-exit-hooks.d/ipsec-dhclient-hook @@ -0,0 +1,88 @@ +#!/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 + +SWANCTL_CONF="/etc/swanctl/swanctl.conf" + +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(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: + writelines(SWANCTL_CONF, conf_lines) + ipsec_down(old_ip) + call('sudo ipsec rereadall') + call('sudo ipsec reload') + call('sudo swanctl -q') +PYEND
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