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[dnssd-server] skip additional records on a PTR query with multiple answers (#9281)

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This commit updates `Dns::ServiceDiscovery::Server` such that when
answering a PTR query with more than one answer, it does not include
additional records. This is to keep the size of the response small.

This commit also updates the test scripts validating browse (PTR
query) function to check the new behavior. In particular, a common
python function `_parse_dns_service_info()` is added to parse service
info in CLI output of "dns browse" or "dns service" commands and
handle if output of "dns browse" does not include service info.
This commit is contained in:
Abtin Keshavarzian
2023-07-17 13:09:06 -07:00
committed by GitHub
parent 55cb65de62
commit bec592084c
8 changed files with 72 additions and 66 deletions
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tests/scripts/thread-cert/test_dnssd.py
+8 -8
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@@ -172,16 +172,14 @@ class TestDnssd(thread_cert.TestCase):
# Browse for main service
service_instances = client1.dns_browse(f'{SERVICE}.{DOMAIN}'.upper(), server.get_mleid(), 53)
self.assertEqual({'ins1', 'ins2', 'ins3'}, set(service_instances.keys()))
self._assert_service_instance_equal(service_instances['ins1'], instance1_verify_info)
self._assert_service_instance_equal(service_instances['ins2'], instance2_verify_info)
self._assert_service_instance_equal(service_instances['ins3'], instance3_verify_info)
# Browse for service sub-type _s1.
service_instances = client1.dns_browse(f'_s1._sub.{SERVICE}.{DOMAIN}'.upper(), server.get_mleid(), 53)
self.assertEqual({'ins1', 'ins3'}, set(service_instances.keys()))
self._assert_service_instance_equal(service_instances['ins1'], instance1_verify_info)
# Browse for service sub-type _s2.
# Since there is only one matching instance, validate that
# server included the service info in additional section.
service_instances = client1.dns_browse(f'_s2._sub.{SERVICE}.{DOMAIN}'.upper(), server.get_mleid(), 53)
self.assertEqual({'ins1'}, set(service_instances.keys()))
self._assert_service_instance_equal(service_instances['ins1'], instance1_verify_info)
@@ -195,6 +193,9 @@ class TestDnssd(thread_cert.TestCase):
service_instance = client1.dns_resolve_service('ins2', f'{SERVICE}.{DOMAIN}'.upper(), server.get_mleid(), 53)
self._assert_service_instance_equal(service_instance, instance2_verify_info)
service_instance = client1.dns_resolve_service('ins3', f'{SERVICE}.{DOMAIN}'.upper(), server.get_mleid(), 53)
self._assert_service_instance_equal(service_instance, instance3_verify_info)
#---------------------------------------------------------------
# Add another service with TXT entries to the existing host and
# verify that it is properly merged.
@@ -204,10 +205,9 @@ class TestDnssd(thread_cert.TestCase):
service_instances = client1.dns_browse(f'{SERVICE}.{DOMAIN}', server.get_mleid(), 53)
self.assertEqual({'ins1', 'ins2', 'ins3', 'ins4'}, set(service_instances.keys()))
self._assert_service_instance_equal(service_instances['ins1'], instance1_verify_info)
self._assert_service_instance_equal(service_instances['ins2'], instance2_verify_info)
self._assert_service_instance_equal(service_instances['ins3'], instance3_verify_info)
self._assert_service_instance_equal(service_instances['ins4'], instance4_verify_info)
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)
def _assert_service_instance_equal(self, instance, info):
self.assertEqual(instance['host'].lower(), info['host'].lower(), instance)