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#!/usr/bin/env python3
#
# Copyright (C) 2019-2020 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/>.

import re
import os
import unittest

from psutil import process_iter

from vyos.configsession import ConfigSession
from vyos.configsession import ConfigSessionError
from vyos.util import read_file
from vyos.util import process_named_running
from vyos.validate import is_ipv6

PROCESS_NAME = 'in.tftpd'
base_path = ['service', 'tftp-server']
dummy_if_path = ['interfaces', 'dummy', 'dum69']
address_ipv4 = '192.0.2.1'
address_ipv6 = '2001:db8::1'

class TestServiceTFTPD(unittest.TestCase):
    def setUp(self):
        self.session = ConfigSession(os.getpid())
        self.session.set(dummy_if_path + ['address', address_ipv4 + '/32'])
        self.session.set(dummy_if_path + ['address', address_ipv6 + '/128'])

    def tearDown(self):
        self.session.delete(base_path)
        self.session.delete(dummy_if_path)
        self.session.commit()
        del self.session

    def test_01_tftpd_single(self):
        directory = '/tmp'
        port = '69' # default port

        self.session.set(base_path + ['allow-upload'])
        self.session.set(base_path + ['directory', directory])
        self.session.set(base_path + ['listen-address', address_ipv4])

        # commit changes
        self.session.commit()

        config = read_file('/etc/default/tftpd0')
        # verify listen IP address
        self.assertIn(f'{address_ipv4}:{port} -4', config)
        # verify directory
        self.assertIn(directory, config)
        # verify upload
        self.assertIn('--create --umask 000', config)

        # Check for running process
        self.assertTrue(process_named_running(PROCESS_NAME))

    def test_02_tftpd_multi(self):
        directory = '/tmp'
        address = [address_ipv4, address_ipv6]
        port = '70'

        self.session.set(base_path + ['directory', directory])
        for addr in address:
            self.session.set(base_path + ['listen-address', addr])
            self.session.set(base_path + ['port', port])

        # commit changes
        self.session.commit()

        for idx in range(0, len(address)):
            config = read_file(f'/etc/default/tftpd{idx}')
            addr = address[idx]

            # verify listen IP address
            if is_ipv6(addr):
                addr = f'[{addr}]'
                self.assertIn(f'{addr}:{port} -6', config)
            else:
                self.assertIn(f'{addr}:{port} -4', config)

            # verify directory
            self.assertIn(directory, config)

        # Check for running processes - one process is spawned per listen
        # IP address, wheter it's IPv4 or IPv6
        count = 0
        for p in process_iter():
            if PROCESS_NAME in p.name():
                count += 1
        self.assertEqual(count, len(address))

if __name__ == '__main__':
    unittest.main()