mdns: added test app

Closes IDF-4132


* Original commit: espressif/esp-idf@e0d5fca390

tools/test_apps/protocols/mdns/main/mdns_test.c

@@ -0,0 +1,166 @@
+/*
+ * SPDX-FileCopyrightText: 2021 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include <string.h>
+#include "mdns.h"
+#include "esp_log.h"
+#include "esp_netif.h"
+
+static const char * TAG = "MDNS_TEST_APP";
+
+static void mdns_print_results(mdns_result_t *results)
+{
+    mdns_result_t *r = results;
+    mdns_ip_addr_t *a = NULL;
+    int t;
+    while (r) {
+        if (r->instance_name) {
+            printf("PTR:%s.%s.%s\n", r->instance_name, r->service_type, r->proto);
+        }
+        if (r->hostname) {
+            printf("SRV:%s.local:%u\n", r->hostname, r->port);
+        }
+        if (r->txt_count) {
+            printf("TXT:[%zu] ", r->txt_count);
+            for (t = 0; t < r->txt_count; t++) {
+                printf("%s=%s(%d); ", r->txt[t].key, r->txt[t].value ? r->txt[t].value : "NULL", r->txt_value_len[t]);
+            }
+            printf("\n");
+        }
+        a = r->addr;
+        while (a) {
+            if (a->addr.type == ESP_IPADDR_TYPE_V6) {
+                printf("  AAAA: " IPV6STR "\n", IPV62STR(a->addr.u_addr.ip6));
+            } else {
+                printf("  A   : " IPSTR "\n", IP2STR(&(a->addr.u_addr.ip4)));
+            }
+            a = a->next;
+        }
+        r = r->next;
+    }
+}
+
+static bool check_and_print_result(mdns_search_once_t *search)
+{
+    // Check if any result is available
+    mdns_result_t * result = NULL;
+    if (!mdns_query_async_get_results(search, 0, &result)) {
+        return false;
+    }
+
+    if (!result) {   // search timeout, but no result
+        return true;
+    }
+
+    // If yes, print the result
+    mdns_ip_addr_t * a = result->addr;
+    while (a) {
+        if(a->addr.type == ESP_IPADDR_TYPE_V6){
+            printf("Async query resolved to AAAA:" IPV6STR "\n", IPV62STR(a->addr.u_addr.ip6));
+        } else {
+            printf("Async query resolved to A:" IPSTR "\n", IP2STR(&(a->addr.u_addr.ip4)));
+        }
+        a = a->next;
+    }
+    // and free the result
+    mdns_query_results_free(result);
+    return true;
+}
+
+static void query_mdns_hosts_async(const char * host_name)
+{
+    ESP_LOGI(TAG, "Query both A and AAA: %s.local", host_name);
+
+    mdns_search_once_t *s_a = mdns_query_async_new(host_name, NULL, NULL, MDNS_TYPE_A, 1000, 1, NULL);
+    mdns_query_async_delete(s_a);
+    mdns_search_once_t *s_aaaa = mdns_query_async_new(host_name, NULL, NULL, MDNS_TYPE_AAAA, 1000, 1, NULL);
+    while (s_a || s_aaaa) {
+        if (s_a && check_and_print_result(s_a)) {
+            ESP_LOGI(TAG, "Query A %s.local finished", host_name);
+            mdns_query_async_delete(s_a);
+            s_a = NULL;
+        }
+        if (s_aaaa && check_and_print_result(s_aaaa)) {
+            ESP_LOGI(TAG, "Query AAAA %s.local finished", host_name);
+            mdns_query_async_delete(s_aaaa);
+            s_aaaa = NULL;
+        }
+    }
+}
+
+static void query_mdns_host(const char * host_name)
+{
+    ESP_LOGI(TAG, "Query A: %s.local", host_name);
+
+    struct esp_ip4_addr addr;
+    addr.addr = 0;
+
+    esp_err_t err = mdns_query_a(host_name, 2000,  &addr);
+    if(err){
+        if(err == ESP_ERR_NOT_FOUND){
+            ESP_LOGW(TAG, "%s: Host was not found!", esp_err_to_name(err));
+            return;
+        }
+        ESP_LOGE(TAG, "Query Failed: %s", esp_err_to_name(err));
+        return;
+    }
+
+    ESP_LOGI(TAG, "Query A: %s.local resolved to: " IPSTR, host_name, IP2STR(&addr));
+}
+
+static void query_mdns_service(const char * instance, const char * service_name, const char * proto)
+{
+    ESP_LOGI(TAG, "Query SRV: %s.%s.local", service_name, proto);
+
+    mdns_result_t * results = NULL;
+    esp_err_t err = mdns_query_srv(instance, service_name, proto, 3000,  &results);
+    if(err){
+        ESP_LOGE(TAG, "Query Failed: %s", esp_err_to_name(err));
+        return;
+    }
+    if(!results){
+        ESP_LOGW(TAG, "No results found!");
+        return;
+    }
+
+    mdns_print_results(results);
+    mdns_query_results_free(results);
+}
+
+void query_mdns_service_sub_type(const char * subtype, const char * service_name, const char * proto) {
+    ESP_LOGI(TAG, "Query PTR: %s.%s.local", service_name, proto);
+
+    mdns_result_t * results = NULL;
+    esp_err_t err = mdns_query_ptr(service_name, proto, 3000, 20,  &results);
+    if(err){
+        ESP_LOGE(TAG, "Query Failed: %s", esp_err_to_name(err));
+        return;
+    }
+    if(!results){
+        ESP_LOGW(TAG, "No results found!");
+        return;
+    }
+
+    mdns_print_results(results);
+    mdns_query_results_free(results);
+}
+
+void mdns_test(const char *line)
+{
+    char test_case[32];
+
+    sscanf(line, "%s", test_case);
+    ESP_LOGI(TAG, "test case = %s", test_case);
+
+    if (strcmp(test_case, "CONFIG_TEST_QUERY_HOST") == 0) {
+        query_mdns_host("tinytester");
+    } else if (strcmp(test_case, "CONFIG_TEST_QUERY_HOST_ASYNC") == 0) {
+        query_mdns_hosts_async("tinytester");
+    } else if (strcmp(test_case, "CONFIG_TEST_QUERY_SERVICE") == 0) {
+        query_mdns_service("ESP32", "_http", "_tcp");
+    } else {
+        ESP_LOGE(TAG, "%s: No such test case", test_case);
+    }
+}