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1#!/usr/bin/env python3
2#
3#  Copyright (c) 2021, The OpenThread Authors.
4#  All rights reserved.
5#
6#  Redistribution and use in source and binary forms, with or without
7#  modification, are permitted provided that the following conditions are met:
8#  1. Redistributions of source code must retain the above copyright
9#     notice, this list of conditions and the following disclaimer.
10#  2. Redistributions in binary form must reproduce the above copyright
11#     notice, this list of conditions and the following disclaimer in the
12#     documentation and/or other materials provided with the distribution.
13#  3. Neither the name of the copyright holder nor the
14#     names of its contributors may be used to endorse or promote products
15#     derived from this software without specific prior written permission.
16#
17#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18#  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19#  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20#  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
21#  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22#  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23#  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24#  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25#  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26#  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27#  POSSIBILITY OF SUCH DAMAGE.
28#
29
30import unittest
31
32import command
33import config
34import thread_cert
35
36# Test description:
37#
38#   This test verifies the behavior of DNS client feature where the SRP
39#   server address (from SRP client auto-start feature) is used as the
40#   default IPv6 address for DNS resolver config when user does not
41#   explicitly set a default address
42#
43# Topology: two nodes
44#
45#   leader (SRP server & client & DNS client) --- router (SRP client & DNS client)
46#
47
48LEADER = 1
49ROUTER = 2
50
51DEFAULT_ADDRESS = 'fd00:1:2:3:4:5:6:7'
52
53
54class DnsClientConfigAutoStart(thread_cert.TestCase):
55    USE_MESSAGE_FACTORY = False
56    SUPPORT_NCP = False
57
58    TOPOLOGY = {
59        LEADER: {
60            'name': 'LEADER',
61            'mode': 'rdn',
62        },
63        ROUTER: {
64            'name': 'ROUTER',
65            'mode': 'rdn',
66        },
67    }
68
69    def test(self):
70        leader = self.nodes[LEADER]
71        router = self.nodes[ROUTER]
72
73        # Form network.
74
75        leader.start()
76        self.simulator.go(config.LEADER_STARTUP_DELAY)
77        self.assertEqual(leader.get_state(), 'leader')
78
79        router.start()
80        self.simulator.go(config.ROUTER_STARTUP_DELAY)
81        self.assertEqual(router.get_state(), 'router')
82
83        # On leader set DNS config explicitly.
84
85        leader.dns_set_config(DEFAULT_ADDRESS)
86        dns_config = leader.dns_get_config()
87        self.assertEqual(dns_config['Server'], '[{}]:53'.format(DEFAULT_ADDRESS))
88
89        # Start leader to act as SRP server.
90
91        leader.srp_server_set_enabled(True)
92
93        # Enable SRP client auto start on both nodes.
94
95        leader.srp_client_enable_auto_start_mode()
96        router.srp_client_enable_auto_start_mode()
97        self.simulator.go(5)
98
99        # Verify that on router the default DNS config is changed
100        # to the same address being used by SRP client.
101
102        srp_server_address = router.srp_client_get_server_address()
103        self.assertEqual(leader.srp_client_get_server_address(), srp_server_address)
104
105        dns_config = router.dns_get_config()
106        self.assertEqual(dns_config['Server'], '[{}]:53'.format(srp_server_address))
107
108        # Verify that on leader the default DNS config remains
109        # as before (the address explicitly set earlier).
110
111        dns_config = leader.dns_get_config()
112        self.assertEqual(dns_config['Server'], '[{}]:53'.format(DEFAULT_ADDRESS))
113
114        # On leader clear DNS config (the explicitly set address)
115        # and verify that it adopts the SRP server address.
116
117        leader.dns_set_config("::")
118        dns_config = leader.dns_get_config()
119        self.assertEqual(dns_config['Server'], '[{}]:53'.format(srp_server_address))
120
121        # On leader set DNS config explicitly again.
122
123        leader.dns_set_config(DEFAULT_ADDRESS)
124        dns_config = leader.dns_get_config()
125        self.assertEqual(dns_config['Server'], '[{}]:53'.format(DEFAULT_ADDRESS))
126
127        # Stop SRP server on leader and start it on router.
128
129        leader.srp_server_set_enabled(False)
130        router.srp_server_set_enabled(True)
131        self.simulator.go(5)
132
133        # Verify that SRP client on router switched to new SRP server.
134
135        self.assertNotEqual(srp_server_address, router.srp_client_get_server_address())
136        self.assertEqual(router.srp_client_get_server_address(), leader.srp_client_get_server_address())
137
138        # Verify that config on router gets changed while on leader
139        # it remains unchanged.
140
141        dns_config = router.dns_get_config()
142        srp_server_address = router.srp_client_get_server_address()
143        self.assertEqual(dns_config['Server'], '[{}]:53'.format(srp_server_address))
144
145        dns_config = leader.dns_get_config()
146        self.assertEqual(dns_config['Server'], '[{}]:53'.format(DEFAULT_ADDRESS))
147
148
149if __name__ == '__main__':
150    unittest.main()
151