#! /usr/bin/python3

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# 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/>.

# Copyright © 2019 Hugo Levy-Falk <me@klafyvel.me>

"""
Creates the nat set.
"""

import logging
from configparser import ConfigParser

from re2oapi import Re2oAPIClient

from firewall import NetfilterSet

CONFIG = ConfigParser()
CONFIG.read('config.ini')

api_hostname = CONFIG.get('Re2o', 'hostname')
api_password = CONFIG.get('Re2o', 'password')
api_username = CONFIG.get('Re2o', 'username')

api_client = Re2oAPIClient(api_hostname, api_username, api_password)

api_client.list('dhcp/hostmacip')

def gen_ip_mac_set():
    """Generates the ip_mac set in nftables.

        Returns:
            A NetfilterSet object with the allowed ip - mac pairs.
    """
    hosts = api_client.list('dhcp/hostmacip')
    content = [
        (h['ipv4'], h['mac_address'])
        for h in hosts
        if h['ipv4'] and h['mac_address']
    ]
    return NetfilterSet(
        target_content=content,
        type_=('IPv4', 'MAC'),
        name='ip_mac',
        table_name='firewall',
    )


def update_macip():
    log = logging.getLogger(__name__)
    if not log.hasHandlers():
        handler = logging.StreamHandler()
        formatter = logging.Formatter(
            "%(asctime)s %(levelname)s %(name)s %(message)s"
        )
        handler.setFormatter(formatter)
        log.addHandler(handler)
        log.setLevel(logging.INFO)
    log.info('Updating the ip - mac set...')
    ip_mac = gen_ip_mac_set()
    log.info('Applying modifications...')
    ip_mac.manage()
    log.info('Done')


if __name__=='__main__':
    update_macip()