#!/usr/bin/env python3
#
# Copyright (C) 2024 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/>.

# Changed value of dead-peer-detection.action from hold to trap
# Changed value of close-action from hold to trap and from restart to start

import re

from sys import argv
from sys import exit

from vyos.configtree import ConfigTree

if len(argv) < 2:
    print("Must specify file name!")
    exit(1)

file_name = argv[1]

with open(file_name, 'r') as f:
    config_file = f.read()

base = ['vpn', 'ipsec', 'ike-group']
config = ConfigTree(config_file)

if not config.exists(base):
    # Nothing to do
    exit(0)
else:
    for ike_group in config.list_nodes(base):
        base_dpd_action = base + [ike_group, 'dead-peer-detection', 'action']
        base_close_action = base + [ike_group, 'close-action']
        if config.exists(base_dpd_action) and config.return_value(base_dpd_action) == 'hold':
            config.set(base_dpd_action, 'trap', replace=True)
        if config.exists(base_close_action):
            if config.return_value(base_close_action) == 'hold':
                config.set(base_close_action, 'trap', replace=True)
            if config.return_value(base_close_action) == 'restart':
                config.set(base_close_action, 'start', replace=True)

try:
    with open(file_name, 'w') as f:
        f.write(config.to_string())
except OSError as e:
    print(f'Failed to save the modified config: {e}')
    exit(1)