361 lines
12 KiB
C
361 lines
12 KiB
C
#include "wifi_manager.h"
|
|
#include <string.h>
|
|
#include "esp_mac.h"
|
|
#include <sys/param.h>
|
|
#include "freertos/FreeRTOS.h"
|
|
#include "freertos/task.h"
|
|
#include "freertos/event_groups.h"
|
|
#include "esp_system.h"
|
|
#include "esp_wifi.h"
|
|
#include "esp_event.h"
|
|
#include "esp_log.h"
|
|
#include "nvs_flash.h"
|
|
#include "nvs.h"
|
|
#include "lwip/err.h"
|
|
#include "lwip/sys.h"
|
|
#include "lwip/sockets.h"
|
|
#include "cJSON.h"
|
|
|
|
// Logs
|
|
static const char *TAG = "WIFI_MGR";
|
|
|
|
// Event Group
|
|
static EventGroupHandle_t s_wifi_event_group;
|
|
#define WIFI_CONNECTED_BIT BIT0
|
|
|
|
// Server Handle for registering handlers
|
|
static httpd_handle_t s_server_handle = NULL;
|
|
|
|
// DNS Port
|
|
#define DNS_PORT 53
|
|
|
|
// SoftAP Config
|
|
#define AP_SSID "ESP-Scope"
|
|
#define AP_PASS ""
|
|
|
|
// Current NVS specified ssid
|
|
static char ssid[33] = {0};
|
|
|
|
// Forward decls
|
|
|
|
static void wifi_init_softap(void);
|
|
static void wifi_init_station(const char* ssid, const char* pass);
|
|
|
|
// NVS Keys
|
|
#define NVS_NAMESPACE "wifi_cfg"
|
|
#define NVS_KEY_SSID "ssid"
|
|
#define NVS_KEY_PASS "pass"
|
|
|
|
bool is_connected(void) {
|
|
return xEventGroupWaitBits(s_wifi_event_group, WIFI_CONNECTED_BIT, pdFALSE, pdFALSE, 1) & WIFI_CONNECTED_BIT;
|
|
}
|
|
|
|
// WiFi Event Handler
|
|
static void event_handler(void *arg, esp_event_base_t event_base,
|
|
int32_t event_id, void *event_data) {
|
|
if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START) {
|
|
esp_wifi_connect();
|
|
} else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {
|
|
ESP_LOGI(TAG, "Retry connecting to AP %s", ssid);
|
|
esp_wifi_connect();
|
|
// In a real product, we might count retries and switch to AP mode if failing.
|
|
// For now, infinite retry is simple.
|
|
} else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
|
|
ip_event_got_ip_t *event = (ip_event_got_ip_t *)event_data;
|
|
ESP_LOGI(TAG, "Got IP: " IPSTR, IP2STR(&event->ip_info.ip));
|
|
xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
|
|
} else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_AP_STACONNECTED) {
|
|
wifi_event_ap_staconnected_t *event = (wifi_event_ap_staconnected_t *)event_data;
|
|
ESP_LOGI(TAG, "station "MACSTR" join, AID=%d", MAC2STR(event->mac), event->aid);
|
|
} else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_AP_STADISCONNECTED) {
|
|
wifi_event_ap_stadisconnected_t *event = (wifi_event_ap_stadisconnected_t *)event_data;
|
|
ESP_LOGI(TAG, "station "MACSTR" leave, AID=%d", MAC2STR(event->mac), event->aid);
|
|
}
|
|
}
|
|
|
|
// -------------------------------------------------------------------------
|
|
// DNS Server Task (Captive Portal)
|
|
// -------------------------------------------------------------------------
|
|
static void dns_server_task(void *pvParameters) {
|
|
int sock;
|
|
struct sockaddr_in server_addr;
|
|
struct sockaddr_in client_addr;
|
|
socklen_t client_addr_len = sizeof(client_addr);
|
|
uint8_t rx_buffer[128];
|
|
uint8_t tx_buffer[128];
|
|
|
|
// Create UDP socket
|
|
sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
|
|
if (sock < 0) {
|
|
ESP_LOGE(TAG, "Unable to create DNS socket: errno %d", errno);
|
|
vTaskDelete(NULL);
|
|
}
|
|
|
|
server_addr.sin_family = AF_INET;
|
|
server_addr.sin_port = htons(DNS_PORT);
|
|
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
|
|
|
|
if (bind(sock, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
|
|
ESP_LOGE(TAG, "Socket unable to bind: errno %d", errno);
|
|
close(sock);
|
|
vTaskDelete(NULL);
|
|
}
|
|
|
|
ESP_LOGI(TAG, "DNS Server started on port 53");
|
|
|
|
while (1) {
|
|
int len = recvfrom(sock, rx_buffer, sizeof(rx_buffer), 0, (struct sockaddr *)&client_addr, &client_addr_len);
|
|
if (len < 0) {
|
|
ESP_LOGE(TAG, "recvfrom failed: errno %d", errno);
|
|
break;
|
|
}
|
|
|
|
// Basic DNS Header Parsing
|
|
// We just want to spoof the answer for any A-record query.
|
|
// Transaction ID: bytes 0-1 (Copy)
|
|
// Flags: bytes 2-3 (Standard Query -> Standard Response)
|
|
|
|
if (len > 12) {
|
|
// Copy Transaction ID
|
|
tx_buffer[0] = rx_buffer[0];
|
|
tx_buffer[1] = rx_buffer[1];
|
|
|
|
// Flags: Response (QR=1), Opcode=0, AA=0, TC=0, RD=1, RA=0, Z=0, RCODE=0
|
|
// 0x8180 (Standard query response, No error)
|
|
tx_buffer[2] = 0x81;
|
|
tx_buffer[3] = 0x80;
|
|
|
|
// Questions Count: Copy (should be 1)
|
|
tx_buffer[4] = rx_buffer[4];
|
|
tx_buffer[5] = rx_buffer[5];
|
|
|
|
// Answer RRs: 1
|
|
tx_buffer[6] = 0x00;
|
|
tx_buffer[7] = 0x01;
|
|
|
|
// Authority RRs: 0
|
|
tx_buffer[8] = 0x00;
|
|
tx_buffer[9] = 0x00;
|
|
|
|
// Additional RRs: 0
|
|
tx_buffer[10] = 0x00;
|
|
tx_buffer[11] = 0x00;
|
|
|
|
// Copy Question Section
|
|
// In a real server we'd parse this length. For simplicity in captive portal,
|
|
// we assume the question fits in the buffer and just echo it.
|
|
// Point to end of question to append answer.
|
|
int question_len = len - 12;
|
|
if (question_len > 0 && (12 + question_len + 16 < sizeof(tx_buffer))) {
|
|
memcpy(&tx_buffer[12], &rx_buffer[12], question_len);
|
|
|
|
// Answer Section
|
|
int offset = 12 + question_len;
|
|
|
|
// Name Pointer (0xC00C -> Point to start of packet header + 12 = start of question name)
|
|
tx_buffer[offset++] = 0xC0;
|
|
tx_buffer[offset++] = 0x0C;
|
|
|
|
// Type: A (Host Address) = 1
|
|
tx_buffer[offset++] = 0x00;
|
|
tx_buffer[offset++] = 0x01;
|
|
|
|
// Class: IN (Internet) = 1
|
|
tx_buffer[offset++] = 0x00;
|
|
tx_buffer[offset++] = 0x01;
|
|
|
|
// TTL: 60 seconds
|
|
tx_buffer[offset++] = 0x00;
|
|
tx_buffer[offset++] = 0x00;
|
|
tx_buffer[offset++] = 0x00;
|
|
tx_buffer[offset++] = 0x3C;
|
|
|
|
// Data Length: 4 (IPv4)
|
|
tx_buffer[offset++] = 0x00;
|
|
tx_buffer[offset++] = 0x04;
|
|
|
|
// Address: 192.168.4.1 (Default SoftAP IP)
|
|
tx_buffer[offset++] = 192;
|
|
tx_buffer[offset++] = 168;
|
|
tx_buffer[offset++] = 4;
|
|
tx_buffer[offset++] = 1;
|
|
|
|
// Send
|
|
sendto(sock, tx_buffer, offset, 0, (struct sockaddr *)&client_addr, client_addr_len);
|
|
}
|
|
}
|
|
}
|
|
close(sock);
|
|
vTaskDelete(NULL);
|
|
}
|
|
|
|
// -------------------------------------------------------------------------
|
|
// Init Functions
|
|
// -------------------------------------------------------------------------
|
|
static void wifi_init_softap(void) {
|
|
ESP_LOGI(TAG, "Starting SoftAP Provisioning Mode...");
|
|
|
|
// Explicitly set mode to NULL first to ensure clean state
|
|
ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_AP));
|
|
|
|
wifi_config_t wifi_config = {
|
|
.ap = {
|
|
.ssid = AP_SSID,
|
|
.ssid_len = strlen(AP_SSID),
|
|
.channel = 1,
|
|
.password = AP_PASS,
|
|
.max_connection = 4,
|
|
.authmode = WIFI_AUTH_OPEN
|
|
},
|
|
};
|
|
if (strlen(AP_PASS) == 0) {
|
|
wifi_config.ap.authmode = WIFI_AUTH_OPEN;
|
|
}
|
|
|
|
ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_AP, &wifi_config));
|
|
ESP_ERROR_CHECK(esp_wifi_start());
|
|
ESP_LOGI(TAG, "SoftAP Started. SSID: %s", AP_SSID);
|
|
|
|
// Start DNS Server Task
|
|
xTaskCreate(dns_server_task, "dns_task", 2048, NULL, 5, NULL);
|
|
}
|
|
|
|
static void wifi_init_station(const char* ssid, const char* pass) {
|
|
ESP_LOGI(TAG, "Starting Station Mode. Connecting to %s...", ssid);
|
|
|
|
wifi_config_t wifi_config = {
|
|
.sta = {
|
|
.threshold.authmode = WIFI_AUTH_WPA2_PSK,
|
|
},
|
|
};
|
|
strncpy((char*)wifi_config.sta.ssid, ssid, sizeof(wifi_config.sta.ssid));
|
|
strncpy((char*)wifi_config.sta.password, pass, sizeof(wifi_config.sta.password));
|
|
|
|
ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
|
|
ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config));
|
|
ESP_ERROR_CHECK(esp_wifi_start());
|
|
ESP_ERROR_CHECK(esp_wifi_set_ps(WIFI_PS_NONE)); // Maintain low jitter optimization
|
|
}
|
|
|
|
// -------------------------------------------------------------------------
|
|
// HTTP Handler: /api/save_wifi
|
|
// -------------------------------------------------------------------------
|
|
static esp_err_t save_wifi_handler(httpd_req_t *req) {
|
|
char buf[200]; // reasonable limit for JSON
|
|
int ret, remaining = req->content_len;
|
|
if (remaining >= sizeof(buf)) {
|
|
httpd_resp_send_500(req);
|
|
return ESP_FAIL;
|
|
}
|
|
|
|
ret = httpd_req_recv(req, buf, remaining);
|
|
if (ret <= 0) return ESP_FAIL;
|
|
buf[ret] = '\0';
|
|
|
|
cJSON *root = cJSON_Parse(buf);
|
|
if (root) {
|
|
cJSON *ssid_item = cJSON_GetObjectItem(root, "ssid");
|
|
cJSON *pass_item = cJSON_GetObjectItem(root, "password");
|
|
|
|
if (cJSON_IsString(ssid_item) && (cJSON_IsString(pass_item))) {
|
|
const char* ssid = ssid_item->valuestring;
|
|
const char* pass = pass_item->valuestring;
|
|
|
|
ESP_LOGI(TAG, "Saving WiFi Credentials: SSID=%s", ssid);
|
|
|
|
// Save to NVS
|
|
nvs_handle_t nvs_handle;
|
|
esp_err_t err = nvs_open(NVS_NAMESPACE, NVS_READWRITE, &nvs_handle);
|
|
if (err == ESP_OK) {
|
|
nvs_set_str(nvs_handle, NVS_KEY_SSID, ssid);
|
|
nvs_set_str(nvs_handle, NVS_KEY_PASS, pass);
|
|
nvs_commit(nvs_handle);
|
|
nvs_close(nvs_handle);
|
|
|
|
httpd_resp_send(req, "Saved. Rebooting...", HTTPD_RESP_USE_STRLEN);
|
|
|
|
// Give time for response to flush
|
|
vTaskDelay(pdMS_TO_TICKS(1000));
|
|
esp_restart();
|
|
} else {
|
|
ESP_LOGE(TAG, "NVS Open Failed");
|
|
httpd_resp_send_500(req);
|
|
}
|
|
}
|
|
cJSON_Delete(root);
|
|
}
|
|
return ESP_OK;
|
|
}
|
|
|
|
static const httpd_uri_t uri_save_wifi = {
|
|
.uri = "/api/save_wifi",
|
|
.method = HTTP_POST,
|
|
.handler = save_wifi_handler,
|
|
.user_ctx = NULL
|
|
};
|
|
|
|
// -------------------------------------------------------------------------
|
|
// Public API
|
|
// -------------------------------------------------------------------------
|
|
|
|
void wifi_manager_register_uri(httpd_handle_t server) {
|
|
s_server_handle = server;
|
|
if (s_server_handle) {
|
|
httpd_register_uri_handler(s_server_handle, &uri_save_wifi);
|
|
}
|
|
}
|
|
|
|
bool wifi_manager_init_wifi(void) {
|
|
s_wifi_event_group = xEventGroupCreate();
|
|
|
|
// 1. Netif Init (Common)
|
|
ESP_ERROR_CHECK(esp_netif_init());
|
|
ESP_ERROR_CHECK(esp_event_loop_create_default());
|
|
|
|
esp_netif_t *sta_netif = esp_netif_create_default_wifi_sta();
|
|
esp_netif_set_hostname(sta_netif, "esp-scope");
|
|
esp_netif_create_default_wifi_ap();
|
|
|
|
wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
|
|
ESP_ERROR_CHECK(esp_wifi_init(&cfg));
|
|
|
|
esp_event_handler_instance_register(WIFI_EVENT, ESP_EVENT_ANY_ID, &event_handler, NULL, NULL);
|
|
esp_event_handler_instance_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &event_handler, NULL, NULL);
|
|
|
|
// 2. Check NVS
|
|
nvs_handle_t nvs_handle;
|
|
char pass[64] = {0};
|
|
size_t ssid_len = sizeof(ssid);
|
|
memset(ssid, 0, sizeof ssid);
|
|
size_t pass_len = sizeof(pass);
|
|
bool has_creds = false;
|
|
|
|
esp_err_t err = nvs_open(NVS_NAMESPACE, NVS_READONLY, &nvs_handle);
|
|
if (err == ESP_OK) {
|
|
if (nvs_get_str(nvs_handle, NVS_KEY_SSID, ssid, &ssid_len) == ESP_OK &&
|
|
nvs_get_str(nvs_handle, NVS_KEY_PASS, pass, &pass_len) == ESP_OK) {
|
|
has_creds = true;
|
|
}
|
|
nvs_close(nvs_handle);
|
|
}
|
|
|
|
// 3. Start Mode
|
|
if (has_creds && strlen(ssid) > 0) {
|
|
wifi_init_station(ssid, pass);
|
|
return false;
|
|
} else {
|
|
wifi_init_softap();
|
|
return true;
|
|
}
|
|
}
|
|
|
|
void wifi_manager_erase_config(void) {
|
|
ESP_LOGW(TAG, "Erasing WiFi Config from NVS...");
|
|
nvs_handle_t nvs_handle;
|
|
if (nvs_open(NVS_NAMESPACE, NVS_READWRITE, &nvs_handle) == ESP_OK) {
|
|
nvs_erase_all(nvs_handle);
|
|
nvs_commit(nvs_handle);
|
|
nvs_close(nvs_handle);
|
|
}
|
|
}
|