# Copyright 2019-2024 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this library.  If not, see <http://www.gnu.org/licenses/>.

# This migration script will check if there is a allow-from directive configured
# for the dns forwarding service - if not, the node will be created with the old
# default values of 0.0.0.0/0 and ::/0

from vyos.configtree import ConfigTree

base = ['service', 'dns', 'forwarding']

def migrate(config: ConfigTree)-> None:
    if not config.exists(base):
        # Nothing to do
        return

    if not config.exists(base + ['allow-from']):
        config.set(base + ['allow-from'], value='0.0.0.0/0', replace=False)
        config.set(base + ['allow-from'], value='::/0', replace=False)