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[nexus] migrate dns_client_config_auto_start to nexus (#12936)
This commit migrates the dns_client_config_auto_start test from the thread-cert Python-based test framework to the Nexus C++ simulation framework. The new Nexus test (test_dns_client_config_auto_start.cpp) verifies: - DNS client uses the SRP server address automatically when no explicit config is set. - Explicitly set DNS config takes precedence over auto-discovered SRP server address. - Clearing an explicit DNS config allows the client to fall back to the auto-discovered SRP server address. - DNS client updates its default config when the SRP server changes. Changes: - Added tests/nexus/test_dns_client_config_auto_start.cpp - Updated tests/nexus/CMakeLists.txt to build the new test - Updated tests/nexus/run_nexus_tests.sh to include it in default - Removed tests/scripts/thread-cert/test_dns_client_config_auto_start.py
This commit is contained in:
Jonathan Hui
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#!/usr/bin/env python3
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#
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# Copyright (c) 2021, The OpenThread Authors.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# 3. Neither the name of the copyright holder nor the
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# names of its contributors may be used to endorse or promote products
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# derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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import unittest
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import command
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import config
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import thread_cert
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# Test description:
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#
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# This test verifies the behavior of DNS client feature where the SRP
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# server address (from SRP client auto-start feature) is used as the
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# default IPv6 address for DNS resolver config when user does not
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# explicitly set a default address
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#
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# Topology: two nodes
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#
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# leader (SRP server & client & DNS client) --- router (SRP client & DNS client)
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#
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LEADER = 1
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ROUTER = 2
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DEFAULT_ADDRESS = 'fd00:1:2:3:4:5:6:7'
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class DnsClientConfigAutoStart(thread_cert.TestCase):
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USE_MESSAGE_FACTORY = False
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SUPPORT_NCP = False
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TOPOLOGY = {
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LEADER: {
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'name': 'LEADER',
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'mode': 'rdn',
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},
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ROUTER: {
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'name': 'ROUTER',
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'mode': 'rdn',
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},
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}
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def test(self):
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leader = self.nodes[LEADER]
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router = self.nodes[ROUTER]
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# Form network.
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leader.start()
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self.simulator.go(config.LEADER_STARTUP_DELAY)
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self.assertEqual(leader.get_state(), 'leader')
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router.start()
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self.simulator.go(config.ROUTER_STARTUP_DELAY)
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self.assertEqual(router.get_state(), 'router')
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# On leader set DNS config explicitly.
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leader.dns_set_config(DEFAULT_ADDRESS)
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dns_config = leader.dns_get_config()
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self.assertEqual(dns_config['Server'], '[{}]:53'.format(DEFAULT_ADDRESS))
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# Start leader to act as SRP server.
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leader.srp_server_set_enabled(True)
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# Enable SRP client auto start on both nodes.
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leader.srp_client_enable_auto_start_mode()
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router.srp_client_enable_auto_start_mode()
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self.simulator.go(5)
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# Verify that on router the default DNS config is changed
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# to the same address being used by SRP client.
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srp_server_address = router.srp_client_get_server_address()
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self.assertEqual(leader.srp_client_get_server_address(), srp_server_address)
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dns_config = router.dns_get_config()
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self.assertEqual(dns_config['Server'], '[{}]:53'.format(srp_server_address))
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# Verify that on leader the default DNS config remains
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# as before (the address explicitly set earlier).
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dns_config = leader.dns_get_config()
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self.assertEqual(dns_config['Server'], '[{}]:53'.format(DEFAULT_ADDRESS))
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# On leader clear DNS config (the explicitly set address)
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# and verify that it adopts the SRP server address.
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leader.dns_set_config("::")
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dns_config = leader.dns_get_config()
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self.assertEqual(dns_config['Server'], '[{}]:53'.format(srp_server_address))
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# On leader set DNS config explicitly again.
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leader.dns_set_config(DEFAULT_ADDRESS)
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dns_config = leader.dns_get_config()
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self.assertEqual(dns_config['Server'], '[{}]:53'.format(DEFAULT_ADDRESS))
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# Stop SRP server on leader and start it on router.
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leader.srp_server_set_enabled(False)
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router.srp_server_set_enabled(True)
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self.simulator.go(5)
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# Verify that SRP client on router switched to new SRP server.
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self.assertNotEqual(srp_server_address, router.srp_client_get_server_address())
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self.assertEqual(router.srp_client_get_server_address(), leader.srp_client_get_server_address())
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# Verify that config on router gets changed while on leader
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# it remains unchanged.
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dns_config = router.dns_get_config()
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srp_server_address = router.srp_client_get_server_address()
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self.assertEqual(dns_config['Server'], '[{}]:53'.format(srp_server_address))
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dns_config = leader.dns_get_config()
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self.assertEqual(dns_config['Server'], '[{}]:53'.format(DEFAULT_ADDRESS))
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if __name__ == '__main__':
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unittest.main()
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