Merge branch 'feature/add_dns_config' into 'master'

example: Add DNS configure and test for static ip example

Closes IDFGH-5523

See merge request espressif/esp-idf!14324

examples/protocols/static_ip/README.md

@@ -21,6 +21,12 @@ Set following parameters under Example Configuration Options:
 
 * Set `Static gateway address` of your device static gateway address.
 
+* Set `Choose DNS server` with `Set manual value as DNS server` or `Use gateway address as DNS server` to configure your DNS server.
+
+* Choose `Set manual value as DNS server` to configure manual DNS server with `Main DNS server address` and `Backup DNS server address`.
+
+* Set `Enable DNS resolve test` to resolve your host which input in `Domain name to resolve`.
+
 ### Build and Flash
 
 Build the project and flash it to the board, then run monitor tool to view serial output:
@@ -82,4 +88,5 @@ I (3253) static_ip: connected to ap SSID:myssid password:mypassword
 W (3273) wifi:<ba-add>idx:0 (ifx:0, 34:29:12:43:c5:40), tid:5, ssn:2, winSize:64
 I (3303) wifi:AP's beacon interval = 102400 us, DTIM period = 1
 I (3303) wifi:new:<11,0>, old:<11,2>, ap:<255,255>, sta:<11,0>, prof:1
+I (5203) static_ip: Resolved IPv4 address: 119.9.92.99
 ```

examples/protocols/static_ip/main/Kconfig.projbuild

@@ -35,4 +35,47 @@ menu "Example Configuration"
         default "192.168.4.1"
         help
             Set static gateway address.
+
+    choice EXAMPLE_STATIC_DNS_SERVER
+        prompt "Choose DNS server"
+        default EXAMPLE_STATIC_DNS_AUTO
+        help
+            Select auto to make gateway address as DNS server or manual to input your DNS server
+        config EXAMPLE_STATIC_DNS_AUTO
+            bool "Use gateway address as DNS server"
+            help
+                Set DNS server the same as gateway address
+
+        config EXAMPLE_STATIC_DNS_MANUAL
+            bool "Set manual value as DNS server"
+            help
+                Set DNS server with you want
+    endchoice
+
+    config EXAMPLE_STATIC_DNS_SERVER_MAIN
+        string "Main DNS server address"
+        default "192.168.4.1"
+        depends on EXAMPLE_STATIC_DNS_MANUAL
+        help
+            Set main DNS server address.
+
+    config EXAMPLE_STATIC_DNS_SERVER_BACKUP
+        string "Backup DNS server address"
+        default "192.168.4.1"
+        depends on EXAMPLE_STATIC_DNS_MANUAL
+        help
+            Set backup DNS server address. It can be same with the main DNS server address or leave empty.
+
+    config EXAMPLE_STATIC_DNS_RESOLVE_TEST
+        bool "Enable DNS resolve test"
+        default n
+        help
+            Enable it and configure EXAMPLE_STATIC_RESOLVE_DOMAIN to resolve DNS domain name
+
+    config EXAMPLE_STATIC_RESOLVE_DOMAIN
+        string "Domain name to resolve"
+        default "www.espressif.com"
+        depends on EXAMPLE_STATIC_DNS_RESOLVE_TEST
+        help
+            Set domain name for DNS test
 endmenu

examples/protocols/static_ip/main/static_ip_example_main.c

@@ -14,6 +14,7 @@
 #include "esp_wifi.h"
 #include "esp_event.h"
 #include "esp_log.h"
+#include <netdb.h>
 #include "nvs_flash.h"
 
 /* The examples use configuration that you can set via project configuration menu
@@ -27,7 +28,16 @@
 #define EXAMPLE_STATIC_IP_ADDR        CONFIG_EXAMPLE_STATIC_IP_ADDR
 #define EXAMPLE_STATIC_NETMASK_ADDR   CONFIG_EXAMPLE_STATIC_NETMASK_ADDR
 #define EXAMPLE_STATIC_GW_ADDR        CONFIG_EXAMPLE_STATIC_GW_ADDR
-
+#ifdef CONFIG_EXAMPLE_STATIC_DNS_AUTO
+#define EXAMPLE_MAIN_DNS_SERVER       EXAMPLE_STATIC_GW_ADDR
+#define EXAMPLE_BACKUP_DNS_SERVER     "0.0.0.0"
+#else
+#define EXAMPLE_MAIN_DNS_SERVER       CONFIG_EXAMPLE_STATIC_DNS_SERVER_MAIN
+#define EXAMPLE_BACKUP_DNS_SERVER     CONFIG_EXAMPLE_STATIC_DNS_SERVER_BACKUP
+#endif
+#ifdef CONFIG_EXAMPLE_STATIC_DNS_RESOLVE_TEST
+#define EXAMPLE_RESOLVE_DOMAIN        CONFIG_EXAMPLE_STATIC_RESOLVE_DOMAIN
+#endif
 /* FreeRTOS event group to signal when we are connected*/
 static EventGroupHandle_t s_wifi_event_group;
 
@@ -41,6 +51,17 @@ static const char *TAG = "static_ip";
 
 static int s_retry_num = 0;
 
+static esp_err_t example_set_dns_server(esp_netif_t *netif, uint32_t addr, esp_netif_dns_type_t type)
+{
+    if (addr && (addr != IPADDR_NONE)) {
+        esp_netif_dns_info_t dns;
+        dns.ip.u_addr.ip4.addr = addr;
+        dns.ip.type = IPADDR_TYPE_V4;
+        ESP_ERROR_CHECK(esp_netif_set_dns_info(netif, type, &dns));
+    }
+    return ESP_OK;
+}
+
 static void example_set_static_ip(esp_netif_t *netif)
 {
     if (esp_netif_dhcpc_stop(netif) != ESP_OK) {
@@ -57,6 +78,8 @@ static void example_set_static_ip(esp_netif_t *netif)
         return;
     }
     ESP_LOGD(TAG, "Success to set static ip: %s, netmask: %s, gw: %s", EXAMPLE_STATIC_IP_ADDR, EXAMPLE_STATIC_NETMASK_ADDR, EXAMPLE_STATIC_GW_ADDR);
+    ESP_ERROR_CHECK(example_set_dns_server(netif, ipaddr_addr(EXAMPLE_MAIN_DNS_SERVER), ESP_NETIF_DNS_MAIN));
+    ESP_ERROR_CHECK(example_set_dns_server(netif, ipaddr_addr(EXAMPLE_BACKUP_DNS_SERVER), ESP_NETIF_DNS_BACKUP));
 }
 
 static void event_handler(void* arg, esp_event_base_t event_base,
@@ -150,7 +173,30 @@ void wifi_init_sta(void)
     } else {
         ESP_LOGE(TAG, "UNEXPECTED EVENT");
     }
+#ifdef CONFIG_EXAMPLE_STATIC_DNS_RESOLVE_TEST
+    struct addrinfo *address_info;
+    struct addrinfo hints;
+    memset(&hints, 0, sizeof(hints));
+    hints.ai_family = AF_UNSPEC;
+    hints.ai_socktype = SOCK_STREAM;
 
+    int res = getaddrinfo(EXAMPLE_RESOLVE_DOMAIN, NULL, &hints, &address_info);
+    if (res != 0 || address_info == NULL) {
+        ESP_LOGE(TAG, "couldn't get hostname for :%s: "
+                      "getaddrinfo() returns %d, addrinfo=%p", EXAMPLE_RESOLVE_DOMAIN, res, address_info);
+    } else {
+        if (address_info->ai_family == AF_INET) {
+            struct sockaddr_in *p = (struct sockaddr_in *)address_info->ai_addr;
+            ESP_LOGI(TAG, "Resolved IPv4 address: %s", ipaddr_ntoa((const ip_addr_t*)&p->sin_addr.s_addr));
+        }
+#if CONFIG_LWIP_IPV6
+        else if (address_info->ai_family == AF_INET6) {
+            struct sockaddr_in6 *p = (struct sockaddr_in6 *)address_info->ai_addr;
+            ESP_LOGI(TAG, "Resolved IPv6 address: %s", ip6addr_ntoa((const ip6_addr_t*)&p->sin6_addr));
+        }
+#endif
+    }
+#endif
     /* The event will not be processed after unregister */
     ESP_ERROR_CHECK(esp_event_handler_instance_unregister(IP_EVENT, IP_EVENT_STA_GOT_IP, instance_got_ip));
     ESP_ERROR_CHECK(esp_event_handler_instance_unregister(WIFI_EVENT, ESP_EVENT_ANY_ID, instance_any_id));