# Copyright 2023-2024 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,
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
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# T5779: system conntrack timeout custom
# Before:
#   Protocols tcp, udp and icmp allowed. When using udp it did not work
#   Only ipv4 custom timeout rules
# Now:
#   Valid protocols are only tcp or udp.
#   Extend functionality to ipv6 and move ipv4 custom rules to new node:
#       set system conntrack timeout custom [ipv4 | ipv6] rule <rule> ...

from vyos.configtree import ConfigTree

base = ['system', 'conntrack']

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

    if config.exists(base + ['timeout', 'custom', 'rule']):
        for rule in config.list_nodes(base + ['timeout', 'custom', 'rule']):
            if config.exists(base + ['timeout', 'custom', 'rule', rule, 'protocol', 'tcp']):
                config.set(base + ['timeout', 'custom', 'ipv4', 'rule'])
                config.copy(base + ['timeout', 'custom', 'rule', rule], base + ['timeout', 'custom', 'ipv4', 'rule', rule])
        config.delete(base + ['timeout', 'custom', 'rule'])