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[dnssd] support generic record queries via discovery proxy and SRP (#11357)

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This commit enhances the OpenThread DNSSD name server/resolver and its
native Discovery Proxy to support queries for arbitrary record
types.

To enable this, a new set of `otPlatDnssd` APIs are introduced for
generic `RecordQuerier`. These APIs mirror the existing APIs in the
OpenThread native mDNS module, allowing direct use of the native mDNS
implementation.

The discovery proxy implementation is updated to start and stop the
mDNS `RecordQuerier` when receiving a query for an arbitrary record
type, passing the first response record back to the client.

The unit tests `test_dnssd_discovery_proxy` and `test_dns_client`
are updated to cover all the newly added behaviors in discovery proxy.
This commit is contained in:
Abtin Keshavarzian
2025-04-23 12:14:05 -07:00
committed by GitHub
parent 4be7e8baa2
commit 20aefc2215
18 changed files with 1378 additions and 239 deletions
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tests/scripts/thread-cert/test_dnssd.py
+48
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@@ -209,6 +209,54 @@ class TestDnssd(thread_cert.TestCase):
service_instance = client1.dns_resolve_service('ins4', f'{SERVICE}.{DOMAIN}'.upper(), server.get_mleid(), 53)
self._assert_service_instance_equal(service_instance, instance4_verify_info)
#---------------------------------------------------------------
# Query for KEY record for `ins1` service name
records = client1.dns_query(25, 'ins1', f'{SERVICE}.{DOMAIN}'.upper(), server.get_mleid(), 53)
self.assertEqual(len(records), 1)
record = records[0]
self.assertEqual(int(record['RecordType']), 25)
self.assertEqual(int(record['RecordLength']), 78)
self.assertTrue(int(record['TTL']) > 0)
self.assertEqual(record['Section'], 'answer')
self.assertEqual(record['Name'].lower(), 'ins1._ipps._tcp.default.service.arpa.')
self.assertIn('RecordData', record)
#---------------------------------------------------------------
# Query for SRV record for `ins1` service name
records = client1.dns_query(33, 'ins1', f'{SERVICE}.{DOMAIN}'.upper(), server.get_mleid(), 53)
self.assertEqual(len(records), 4)
# SRV record in answer section
record = records[0]
self.assertEqual(int(record['RecordType']), 33)
self.assertTrue(int(record['RecordLength']) > 0)
self.assertTrue(int(record['TTL']) > 0)
self.assertEqual(record['Section'], 'answer')
self.assertEqual(record['Name'].lower(), 'ins1._ipps._tcp.default.service.arpa.')
self.assertIn('RecordData', record)
# Other records TXT and A in additional section
for record in records[1:]:
self.assertTrue(int(record['RecordLength']) > 0)
self.assertIn('RecordData', record)
self.assertTrue(int(record['TTL']) > 0)
self.assertEqual(record['Section'], 'additional')
rrtype = int(record['RecordType'])
self.assertIn(rrtype, [16, 28]) # TXT and AAAA
if rrtype == 16:
self.assertEqual(record['Name'].lower(), 'ins1._ipps._tcp.default.service.arpa.')
self.assertEqual(record['RecordData'], '[00]')
else:
self.assertEqual(record['Name'].lower(), 'host1.default.service.arpa.')
#---------------------------------------------------------------
# Query for non-existing A record for `ins1` service name
records = client1.dns_query(1, 'ins1', f'{SERVICE}.{DOMAIN}'.upper(), server.get_mleid(), 53)
self.assertEqual(len(records), 0)
def _assert_service_instance_equal(self, instance, info):
self.assertEqual(instance['host'].lower(), info['host'].lower(), instance)
for f in ('port', 'priority', 'weight', 'txt_data'):