Prepare for enterprise WiFi.

main/include/wifi_connection.h

@@ -7,3 +7,5 @@
 
 void wifi_init();
 bool wifi_connect(const char* aSsid, const char* aPassword, wifi_auth_mode_t aAuthmode, uint8_t aRetryMax);
+bool wifi_connect_ent(const char* aSsid, const char *aIdent, const char *aAnonIdent, const char* aPassword, uint8_t aRetryMax);
+void wifi_scan();

main/main.c

@@ -306,30 +306,79 @@ void display_fatal_error(pax_buf_t* pax_buffer, ILI9341* ili9341, const char* li
     ili9341_write(ili9341, pax_buffer->buf);
 }
 
+// void wifi_connect_to_stored() {
+//     wifi_connect_ent("MCH2022-legacy", "thefunny", "q", "nope, you are not", 3);
+// }
+
 void wifi_connect_to_stored() {
+    // Open NVS.
     nvs_handle_t handle;
     nvs_open("system", NVS_READWRITE, &handle);
-    char ssid[33];
-    char password[33];
-    size_t requiredSize;
-    esp_err_t res = nvs_get_str(handle, "wifi.ssid", NULL, &requiredSize);
-    if (res != ESP_OK) {
-        strcpy(ssid, "");
-    } else if (requiredSize < sizeof(ssid)) {
-        res = nvs_get_str(handle, "wifi.ssid", ssid, &requiredSize);
-        if (res != ESP_OK) strcpy(ssid, "");
-        res = nvs_get_str(handle, "wifi.password", NULL, &requiredSize);
-        if (res != ESP_OK) {
-            strcpy(password, "");
-        } else if (requiredSize < sizeof(password)) {
-            res = nvs_get_str(handle, "wifi.password", password, &requiredSize);
-            if (res != ESP_OK) strcpy(password, "");
-        }
+    uint8_t use_ent;
+    char *ssid = NULL;
+    char *ident = NULL;
+    char *anon_ident = NULL;
+    char *password = NULL;
+    size_t len;
+    
+    // Read NVS.
+    esp_err_t res;
+    // Read SSID.
+    res = nvs_get_str(handle, "wifi.ssid", NULL, &len);
+    if (res) goto errcheck;
+    ssid = malloc(len);
+    res = nvs_get_str(handle, "wifi.ssid", ssid, &len);
+    if (res) goto errcheck;
+    // Check whether connection is enterprise.
+    res = nvs_get_u8(handle, "wifi.use_ent", &use_ent);
+    if (res) goto errcheck;
+    if (use_ent) {
+        // Read enterprise-specific parameters.
+        // Read identity.
+        res = nvs_get_str(handle, "wifi.ident", NULL, &len);
+        if (res) goto errcheck;
+        ident = malloc(len);
+        res = nvs_get_str(handle, "wifi.ident", ident, &len);
+        // Read anonymous identity.
+        res = nvs_get_str(handle, "wifi.anon_ident", NULL, &len);
+        if (res) goto errcheck;
+        anon_ident = malloc(len);
+        res = nvs_get_str(handle, "wifi.anon_ident", anon_ident, &len);
+        if (res) goto errcheck;
     }
+    // Read password.
+    res = nvs_get_str(handle, "wifi.password", NULL, &len);
+    if (res) goto errcheck;
+    password = malloc(len);
+    res = nvs_get_str(handle, "wifi.password", password, &len);
+    if (res) goto errcheck;
+    
+    // Close NVS.
     nvs_close(handle);
+    
+    // Open the appropriate connection.
+    if (use_ent) {
+        wifi_connect_ent(ssid, ident, anon_ident, password, 3);
+    } else {
         wifi_connect(ssid, password, WIFI_AUTH_WPA2_PSK, 3);
     }
     
+    errcheck:
+    if (res == ESP_ERR_NVS_NOT_FOUND || res == ESP_ERR_NVS_NOT_INITIALIZED) {
+        // When NVS is not initialised.
+        ESP_LOGI(TAG, "WiFi settings not stored in NVS.");
+    } else if (res) {
+        // Other errors.
+        ESP_LOGE(TAG, "Error connecting to WiFi: %s", esp_err_to_name(res));
+    }
+    
+    // Free memory.
+    if (ssid) free(ssid);
+    if (ident) free(ident);
+    if (anon_ident) free(anon_ident);
+    if (password) free(password);
+}
+
 void list_files_in_folder(const char* path) {
     DIR* dir = opendir(path);
     if (dir == NULL) {
@@ -818,6 +867,7 @@ void app_main(void) {
                     } else {
                         graphics_task(pax_buffer, ili9341, NULL, "Canceled");
                     }
+                    nvs_set_u8(handle, "wifi.use_ent", 0);
                     nvs_close(handle);
                 } else if (menu_action == ACTION_WIFI_LIST) {
                     nvs_handle_t handle;

main/wifi_connection.c

@@ -4,6 +4,7 @@
 #include "freertos/event_groups.h"
 #include "esp_system.h"
 #include "esp_wifi.h"
+#include "esp_wpa2.h"
 #include "esp_event.h"
 #include "esp_log.h"
 #include "lwip/err.h"
@@ -68,8 +69,12 @@ bool wifi_connect(const char* aSsid, const char* aPassword, wifi_auth_mode_t aAu
     strcpy((char*) wifi_config.sta.password, aPassword);
     wifi_config.sta.threshold.authmode = aAuthmode;
     
+    // Set WiFi config.
     ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
     ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config));
+    // Disable 11b as NOC asked.
+    esp_wifi_config_11b_rate(WIFI_IF_STA, true);
+    // Start WiFi.
     ESP_ERROR_CHECK(esp_wifi_start());
     
     ESP_LOGI(TAG, "Connecting to WiFi...");
@@ -90,3 +95,52 @@ bool wifi_connect(const char* aSsid, const char* aPassword, wifi_auth_mode_t aAu
     }
     return false;
 }
+
+bool wifi_connect_ent(const char* aSsid, const char *aIdent, const char *aAnonIdent, const char* aPassword, uint8_t aRetryMax) {
+    gRetryCounter = 0;
+    gRetryMax = aRetryMax;
+    wifi_config_t wifi_config = {0};
+    if (strlen(aSsid) > 32) {
+        ESP_LOGE(TAG, "SSID is too long (%zu > 32)!", strlen(aSsid));
+        return false;
+    }
+    strncpy((char*) wifi_config.sta.ssid, aSsid, 32);
+    
+    // Set WiFi config.
+    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA) );
+    ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config) );
+    
+    // Set WPA2 ENT config.
+    esp_wifi_sta_wpa2_ent_set_identity((const uint8_t *) aAnonIdent, strlen(aAnonIdent));
+    esp_wifi_sta_wpa2_ent_set_username((const uint8_t *) aIdent, strlen(aIdent));
+    esp_wifi_sta_wpa2_ent_set_password((const uint8_t *) aPassword, strlen(aPassword));
+    esp_wifi_sta_wpa2_ent_set_ttls_phase2_method(ESP_EAP_TTLS_PHASE2_MSCHAPV2);
+    // Enable enterprise auth.
+    esp_wifi_sta_wpa2_ent_enable();
+    // Disable 11b as NOC asked.
+    esp_wifi_config_11b_rate(WIFI_IF_STA, true);
+    // Start the connection.
+    esp_wifi_start();
+    
+    ESP_LOGI(TAG, "Connecting to WiFi...");
+    
+    /* Waiting until either the connection is established (WIFI_CONNECTED_BIT) or connection failed for the maximum
+     * number of re-tries (WIFI_FAIL_BIT). The bits are set by event_handler() (see above) */
+    EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group, WIFI_CONNECTED_BIT | WIFI_FAIL_BIT, pdFALSE, pdFALSE, portMAX_DELAY);
+    /* xEventGroupWaitBits() returns the bits before the call returned, hence we can test which event actually happened. */
+    if (bits & WIFI_CONNECTED_BIT) {
+        ESP_LOGI(TAG, "Connected to WiFi");
+        return true;
+    } else if (bits & WIFI_FAIL_BIT) {
+        ESP_LOGE(TAG, "Failed to connect");
+        ESP_ERROR_CHECK(esp_wifi_stop());
+    } else {
+        ESP_LOGE(TAG, "Unknown event received while waiting on connection");
+        ESP_ERROR_CHECK(esp_wifi_stop());
+    }
+    return false;
+}
+
+void wifi_scan() {
+    
+}