dns_server: fix mdns lookup ttl issue

src/dns_client.c

@@ -1888,7 +1888,7 @@ static int _dns_client_recv(struct dns_server_info *server_info, unsigned char *
 			_dns_replied_check_remove(query, from, from_len);
 			atomic_inc(&query->dns_request_sent);
 			if (ret == DNS_CLIENT_ACTION_RETRY) {
-				/* 
+				/*
 				 * retry immdiately
 				 * The socket needs to be re-created to avoid being limited, such as 1.1.1.1
 				 */
@@ -2076,9 +2076,6 @@ errout:
 	return -1;
 }
 
-#include <net/if.h>
-#include <sys/ioctl.h>
-
 static int _dns_client_create_socket_udp_mdns(struct dns_server_info *server_info)
 {
 	int fd = 0;

src/dns_server.c

@@ -6710,7 +6710,7 @@ static void _dns_server_mdns_query_setup_server_group(struct dns_request *reques
 	}
 
 	*group_name = DNS_SERVER_GROUP_MDNS;
-	safe_strncpy(request->dns_group_name, DNS_SERVER_GROUP_MDNS, sizeof(request->dns_group_name));
+	safe_strncpy(request->dns_group_name, *group_name, sizeof(request->dns_group_name));
 	return;
 }
 
@@ -6949,18 +6949,19 @@ static int _dns_server_do_query(struct dns_request *request, int skip_notify_eve
 	/* check and set passthrough */
 	_dns_server_check_set_passthrough(request);
 
+	/* process ptr */
+	if (_dns_server_process_ptr_query(request) == 0) {
+		goto clean_exit;
+	}
+
 	/* process cache */
 	if (request->prefetch == 0 && request->dualstack_selection_query == 0) {
+		_dns_server_mdns_query_setup_server_group(request, &server_group_name);
 		if (_dns_server_process_cache(request) == 0) {
 			goto clean_exit;
 		}
 	}
 
-	/* process ptr */
-	if (_dns_server_process_ptr_query(request) == 0) {
-		goto clean_exit;
-	}
-
 	ret = _dns_server_set_to_pending_list(request);
 	if (ret == 0) {
 		goto clean_exit;

test/cases/test-mdns.cc

@@ -87,6 +87,16 @@ mdns-lookup yes
 	EXPECT_EQ(client.GetAnswer()[1].GetName(), "host.local");
 	EXPECT_EQ(client.GetAnswer()[1].GetData(), "1.2.3.4");
 
+	ASSERT_TRUE(client.Query("host A", 60053));
+	std::cout << client.GetResult() << std::endl;
+	ASSERT_EQ(client.GetAnswerNum(), 2);
+	EXPECT_EQ(client.GetStatus(), "NOERROR");
+	EXPECT_EQ(client.GetAnswer()[0].GetName(), "host");
+	EXPECT_GT(client.GetAnswer()[0].GetTTL(), 60);
+	EXPECT_EQ(client.GetAnswer()[0].GetData(), "host.local.");
+	EXPECT_EQ(client.GetAnswer()[1].GetName(), "host.local");
+	EXPECT_EQ(client.GetAnswer()[1].GetData(), "1.2.3.4");
+
 	ASSERT_TRUE(client.Query("host AAAA", 60053));
 	std::cout << client.GetResult() << std::endl;
 	ASSERT_EQ(client.GetAnswerNum(), 2);