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esp_websocket_client.c
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/*
* SPDX-FileCopyrightText: 2015-2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdio.h>
#include "esp_websocket_client.h"
#include "esp_transport.h"
#include "esp_transport_tcp.h"
#include "esp_transport_ssl.h"
/* using uri parser */
#include "http_parser.h"
#include "freertos/task.h"
#include "freertos/semphr.h"
#include "freertos/queue.h"
#include "freertos/event_groups.h"
#include "esp_log.h"
#include "esp_timer.h"
#include "esp_tls_crypto.h"
#include "esp_system.h"
#include <errno.h>
#include <arpa/inet.h>
static const char *TAG = "websocket_client";
#define WEBSOCKET_TCP_DEFAULT_PORT (80)
#define WEBSOCKET_SSL_DEFAULT_PORT (443)
#define WEBSOCKET_BUFFER_SIZE_BYTE (1024)
#define WEBSOCKET_RECONNECT_TIMEOUT_MS (10*1000)
#define WEBSOCKET_TASK_PRIORITY (5)
#define WEBSOCKET_TASK_STACK (4*1024)
#define WEBSOCKET_NETWORK_TIMEOUT_MS (10*1000)
#define WEBSOCKET_PING_INTERVAL_SEC (10)
#define WEBSOCKET_EVENT_QUEUE_SIZE (1)
#define WEBSOCKET_PINGPONG_TIMEOUT_SEC (120)
#define WEBSOCKET_KEEP_ALIVE_IDLE (5)
#define WEBSOCKET_KEEP_ALIVE_INTERVAL (5)
#define WEBSOCKET_KEEP_ALIVE_COUNT (3)
#define ESP_WS_CLIENT_MEM_CHECK(TAG, a, action) if (!(a)) { \
ESP_LOGE(TAG,"%s(%d): %s", __FUNCTION__, __LINE__, "Memory exhausted"); \
action; \
}
#define ESP_WS_CLIENT_ERR_OK_CHECK(TAG, err, action) { \
esp_err_t _esp_ws_err_to_check = err; \
if (_esp_ws_err_to_check != ESP_OK) { \
ESP_LOGE(TAG,"%s(%d): Expected ESP_OK; reported: %d", __FUNCTION__, __LINE__, _esp_ws_err_to_check); \
action; \
} \
}
#define ESP_WS_CLIENT_STATE_CHECK(TAG, a, action) if ((a->state) < WEBSOCKET_STATE_INIT) { \
ESP_LOGE(TAG,"%s(%d): %s", __FUNCTION__, __LINE__, "Websocket already stop"); \
action; \
}
#define WS_OVER_TCP_SCHEME "ws"
#define WS_OVER_TLS_SCHEME "wss"
#define WS_HTTP_BASIC_AUTH "Basic "
const static int STOPPED_BIT = BIT0;
const static int CLOSE_FRAME_SENT_BIT = BIT1; // Indicates that a close frame was sent by the client
// and we are waiting for the server to continue with clean close
ESP_EVENT_DEFINE_BASE(WEBSOCKET_EVENTS);
typedef struct {
const char *task_name;
int task_stack;
int task_prio;
char *uri;
char *host;
char *path;
char *scheme;
char *username;
char *password;
char *auth;
int port;
bool auto_reconnect;
void *user_context;
int network_timeout_ms;
char *subprotocol;
char *user_agent;
char *headers;
int pingpong_timeout_sec;
size_t ping_interval_sec;
const char *cert;
size_t cert_len;
const char *client_cert;
size_t client_cert_len;
const char *client_key;
size_t client_key_len;
#if CONFIG_ESP_TLS_USE_DS_PERIPHERAL
void *client_ds_data;
#endif
bool use_global_ca_store;
bool skip_cert_common_name_check;
const char *cert_common_name;
esp_err_t (*crt_bundle_attach)(void *conf);
esp_transport_handle_t ext_transport;
} websocket_config_storage_t;
typedef enum {
WEBSOCKET_STATE_ERROR = -1,
WEBSOCKET_STATE_UNKNOW = 0,
WEBSOCKET_STATE_INIT,
WEBSOCKET_STATE_CONNECTED,
WEBSOCKET_STATE_WAIT_TIMEOUT,
WEBSOCKET_STATE_CLOSING,
} websocket_client_state_t;
struct esp_websocket_client {
esp_event_loop_handle_t event_handle;
TaskHandle_t task_handle;
esp_websocket_error_codes_t error_handle;
esp_transport_list_handle_t transport_list;
esp_transport_handle_t transport;
websocket_config_storage_t *config;
websocket_client_state_t state;
uint64_t keepalive_tick_ms;
uint64_t reconnect_tick_ms;
uint64_t ping_tick_ms;
uint64_t pingpong_tick_ms;
int wait_timeout_ms;
bool run;
bool wait_for_pong_resp;
bool selected_for_destroying;
EventGroupHandle_t status_bits;
SemaphoreHandle_t lock;
size_t errormsg_size;
char *errormsg_buffer;
char *rx_buffer;
char *tx_buffer;
int buffer_size;
bool last_fin;
ws_transport_opcodes_t last_opcode;
int payload_len;
int payload_offset;
esp_transport_keep_alive_t keep_alive_cfg;
struct ifreq *if_name;
};
static uint64_t _tick_get_ms(void)
{
return esp_timer_get_time() / 1000;
}
static esp_err_t esp_websocket_new_buf(esp_websocket_client_handle_t client, bool is_tx)
{
#ifdef CONFIG_ESP_WS_CLIENT_ENABLE_DYNAMIC_BUFFER
if (is_tx) {
if (client->tx_buffer) {
free(client->tx_buffer);
}
client->tx_buffer = calloc(1, client->buffer_size);
ESP_WS_CLIENT_MEM_CHECK(TAG, client->tx_buffer, return ESP_ERR_NO_MEM);
} else {
if (client->rx_buffer) {
free(client->rx_buffer);
}
client->rx_buffer = calloc(1, client->buffer_size);
ESP_WS_CLIENT_MEM_CHECK(TAG, client->rx_buffer, return ESP_ERR_NO_MEM);
}
#endif
return ESP_OK;
}
static void esp_websocket_free_buf(esp_websocket_client_handle_t client, bool is_tx)
{
#ifdef CONFIG_ESP_WS_CLIENT_ENABLE_DYNAMIC_BUFFER
if (is_tx) {
if (client->tx_buffer) {
free(client->tx_buffer);
client->tx_buffer = NULL;
}
} else {
if (client->rx_buffer) {
free(client->rx_buffer);
client->rx_buffer = NULL;
}
}
#endif
}
static esp_err_t esp_websocket_client_dispatch_event(esp_websocket_client_handle_t client,
esp_websocket_event_id_t event,
const char *data,
int data_len)
{
esp_err_t err;
esp_websocket_event_data_t event_data;
event_data.client = client;
event_data.user_context = client->config->user_context;
event_data.data_ptr = data;
event_data.data_len = data_len;
event_data.fin = client->last_fin;
event_data.op_code = client->last_opcode;
event_data.payload_len = client->payload_len;
event_data.payload_offset = client->payload_offset;
if (client->error_handle.error_type == WEBSOCKET_ERROR_TYPE_TCP_TRANSPORT) {
event_data.error_handle.esp_tls_last_esp_err = esp_tls_get_and_clear_last_error(esp_transport_get_error_handle(client->transport),
&client->error_handle.esp_tls_stack_err,
&client->error_handle.esp_tls_cert_verify_flags);
event_data.error_handle.esp_tls_stack_err = client->error_handle.esp_tls_stack_err;
event_data.error_handle.esp_tls_cert_verify_flags = client->error_handle.esp_tls_cert_verify_flags;
event_data.error_handle.esp_transport_sock_errno = esp_transport_get_errno(client->transport);
}
event_data.error_handle.error_type = client->error_handle.error_type;
event_data.error_handle.esp_ws_handshake_status_code = client->error_handle.esp_ws_handshake_status_code;
if ((err = esp_event_post_to(client->event_handle,
WEBSOCKET_EVENTS, event,
&event_data,
sizeof(esp_websocket_event_data_t),
portMAX_DELAY)) != ESP_OK) {
return err;
}
return esp_event_loop_run(client->event_handle, 0);
}
static esp_err_t esp_websocket_client_abort_connection(esp_websocket_client_handle_t client, esp_websocket_error_type_t error_type)
{
ESP_WS_CLIENT_STATE_CHECK(TAG, client, return ESP_FAIL);
esp_transport_close(client->transport);
if (!client->config->auto_reconnect) {
client->run = false;
client->state = WEBSOCKET_STATE_UNKNOW;
} else {
client->reconnect_tick_ms = _tick_get_ms();
ESP_LOGI(TAG, "Reconnect after %d ms", client->wait_timeout_ms);
client->state = WEBSOCKET_STATE_WAIT_TIMEOUT;
}
client->error_handle.error_type = error_type;
esp_websocket_client_dispatch_event(client, WEBSOCKET_EVENT_DISCONNECTED, NULL, 0);
return ESP_OK;
}
static esp_err_t esp_websocket_client_error(esp_websocket_client_handle_t client, const char *format, ...) __attribute__ ((format (printf, 2, 3)));
static esp_err_t esp_websocket_client_error(esp_websocket_client_handle_t client, const char *format, ...)
{
va_list myargs;
va_start(myargs, format);
size_t needed_size = vsnprintf(NULL, 0, format, myargs);
needed_size++; // null terminator
if (needed_size > client->errormsg_size) {
if (client->errormsg_buffer) {
free(client->errormsg_buffer);
}
client->errormsg_buffer = malloc(needed_size);
if (client->errormsg_buffer == NULL) {
client->errormsg_size = 0;
ESP_LOGE(TAG, "Failed to allocate...");
return ESP_ERR_NO_MEM;
}
client->errormsg_size = needed_size;
}
needed_size = vsnprintf(client->errormsg_buffer, client->errormsg_size, format, myargs);
va_end(myargs);
ESP_LOGE(TAG, "%s", client->errormsg_buffer);
esp_websocket_client_dispatch_event(client, WEBSOCKET_EVENT_ERROR, client->errormsg_buffer, needed_size);
return ESP_OK;
}
static char *http_auth_basic(const char *username, const char *password)
{
int out;
char *user_info = NULL;
char *digest = NULL;
size_t n = 0;
if (asprintf(&user_info, "%s:%s", username, password) < 0) {
return NULL;
}
if (!user_info) {
ESP_LOGE(TAG, "No enough memory for user information");
return NULL;
}
esp_crypto_base64_encode(NULL, 0, &n, (const unsigned char *)user_info, strlen(user_info));
digest = calloc(1, strlen(WS_HTTP_BASIC_AUTH) + n + 1);
if (digest) {
strcpy(digest, WS_HTTP_BASIC_AUTH);
esp_crypto_base64_encode((unsigned char *)digest + 6, n, (size_t *)&out, (const unsigned char *)user_info, strlen(user_info));
}
free(user_info);
return digest;
}
static esp_err_t esp_websocket_client_set_config(esp_websocket_client_handle_t client, const esp_websocket_client_config_t *config)
{
websocket_config_storage_t *cfg = client->config;
cfg->task_prio = config->task_prio;
if (cfg->task_prio <= 0) {
cfg->task_prio = WEBSOCKET_TASK_PRIORITY;
}
cfg->task_name = config->task_name;
cfg->task_stack = config->task_stack;
if (cfg->task_stack == 0) {
cfg->task_stack = WEBSOCKET_TASK_STACK;
}
if (config->host) {
cfg->host = strdup(config->host);
ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->host, return ESP_ERR_NO_MEM);
}
if (config->port) {
cfg->port = config->port;
}
if (config->username) {
free(cfg->username);
cfg->username = strdup(config->username);
ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->username, return ESP_ERR_NO_MEM);
}
if (config->password) {
free(cfg->password);
cfg->password = strdup(config->password);
ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->password, return ESP_ERR_NO_MEM);
}
if (cfg->username && cfg->password) {
free(cfg->auth);
cfg->auth = http_auth_basic(cfg->username, cfg->password);
ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->auth, return ESP_ERR_NO_MEM);
}
if (config->uri) {
free(cfg->uri);
cfg->uri = strdup(config->uri);
ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->uri, return ESP_ERR_NO_MEM);
}
if (config->path) {
free(cfg->path);
cfg->path = strdup(config->path);
ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->path, return ESP_ERR_NO_MEM);
}
if (config->subprotocol) {
free(cfg->subprotocol);
cfg->subprotocol = strdup(config->subprotocol);
ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->subprotocol, return ESP_ERR_NO_MEM);
}
if (config->user_agent) {
free(cfg->user_agent);
cfg->user_agent = strdup(config->user_agent);
ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->user_agent, return ESP_ERR_NO_MEM);
}
if (config->headers) {
free(cfg->headers);
cfg->headers = strdup(config->headers);
ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->headers, return ESP_ERR_NO_MEM);
}
cfg->user_context = config->user_context;
cfg->auto_reconnect = true;
if (config->disable_auto_reconnect) {
cfg->auto_reconnect = false;
}
if (config->disable_pingpong_discon) {
cfg->pingpong_timeout_sec = 0;
} else if (config->pingpong_timeout_sec) {
cfg->pingpong_timeout_sec = config->pingpong_timeout_sec;
} else {
cfg->pingpong_timeout_sec = WEBSOCKET_PINGPONG_TIMEOUT_SEC;
}
if (config->network_timeout_ms <= 0) {
cfg->network_timeout_ms = WEBSOCKET_NETWORK_TIMEOUT_MS;
ESP_LOGW(TAG, "`network_timeout_ms` is not set, or it is less than or equal to zero, using default time out %d (milliseconds)", WEBSOCKET_NETWORK_TIMEOUT_MS);
} else {
cfg->network_timeout_ms = config->network_timeout_ms;
}
if (config->ping_interval_sec == 0) {
cfg->ping_interval_sec = WEBSOCKET_PING_INTERVAL_SEC;
} else {
cfg->ping_interval_sec = config->ping_interval_sec;
}
return ESP_OK;
}
static esp_err_t esp_websocket_client_destroy_config(esp_websocket_client_handle_t client)
{
if (client == NULL) {
return ESP_ERR_INVALID_ARG;
}
websocket_config_storage_t *cfg = client->config;
if (client->config == NULL) {
return ESP_ERR_INVALID_ARG;
}
free(cfg->host);
free(cfg->uri);
free(cfg->path);
free(cfg->scheme);
free(cfg->username);
free(cfg->password);
free(cfg->auth);
free(cfg->subprotocol);
free(cfg->user_agent);
free(cfg->headers);
memset(cfg, 0, sizeof(websocket_config_storage_t));
free(client->config);
client->config = NULL;
return ESP_OK;
}
static void destroy_and_free_resources(esp_websocket_client_handle_t client)
{
if (client->event_handle) {
esp_event_loop_delete(client->event_handle);
}
if (client->if_name) {
free(client->if_name);
}
esp_websocket_client_destroy_config(client);
if (client->transport_list) {
esp_transport_list_destroy(client->transport_list);
}
vSemaphoreDelete(client->lock);
free(client->tx_buffer);
free(client->rx_buffer);
free(client->errormsg_buffer);
if (client->status_bits) {
vEventGroupDelete(client->status_bits);
}
free(client);
client = NULL;
}
static esp_err_t stop_wait_task(esp_websocket_client_handle_t client)
{
/* A running client cannot be stopped from the websocket task/event handler */
TaskHandle_t running_task = xTaskGetCurrentTaskHandle();
if (running_task == client->task_handle) {
ESP_LOGE(TAG, "Client cannot be stopped from websocket task");
return ESP_FAIL;
}
client->run = false;
xEventGroupWaitBits(client->status_bits, STOPPED_BIT, false, true, portMAX_DELAY);
client->state = WEBSOCKET_STATE_UNKNOW;
return ESP_OK;
}
static esp_err_t set_websocket_transport_optional_settings(esp_websocket_client_handle_t client, const char *scheme)
{
esp_transport_handle_t trans = esp_transport_list_get_transport(client->transport_list, scheme);
if (trans) {
const esp_transport_ws_config_t config = {
.ws_path = client->config->path,
.sub_protocol = client->config->subprotocol,
.user_agent = client->config->user_agent,
.headers = client->config->headers,
.auth = client->config->auth,
.propagate_control_frames = true
};
return esp_transport_ws_set_config(trans, &config);
}
return ESP_ERR_INVALID_ARG;
}
static esp_err_t esp_websocket_client_create_transport(esp_websocket_client_handle_t client)
{
if (!client->config->scheme) {
ESP_LOGE(TAG, "No scheme found");
return ESP_FAIL;
}
if (client->transport_list) {
esp_transport_list_destroy(client->transport_list);
client->transport_list = NULL;
}
client->transport_list = esp_transport_list_init();
ESP_WS_CLIENT_MEM_CHECK(TAG, client->transport_list, return ESP_ERR_NO_MEM);
if (strcasecmp(client->config->scheme, WS_OVER_TCP_SCHEME) == 0) {
esp_transport_handle_t tcp = esp_transport_tcp_init();
ESP_WS_CLIENT_MEM_CHECK(TAG, tcp, return ESP_ERR_NO_MEM);
esp_transport_set_default_port(tcp, WEBSOCKET_TCP_DEFAULT_PORT);
esp_transport_list_add(client->transport_list, tcp, "_tcp"); // need to save to transport list, for cleanup
if (client->keep_alive_cfg.keep_alive_enable) {
esp_transport_tcp_set_keep_alive(tcp, &client->keep_alive_cfg);
}
if (client->if_name) {
esp_transport_tcp_set_interface_name(tcp, client->if_name);
}
esp_transport_handle_t ws = esp_transport_ws_init(tcp);
ESP_WS_CLIENT_MEM_CHECK(TAG, ws, return ESP_ERR_NO_MEM);
esp_transport_set_default_port(ws, WEBSOCKET_TCP_DEFAULT_PORT);
esp_transport_list_add(client->transport_list, ws, WS_OVER_TCP_SCHEME);
ESP_WS_CLIENT_ERR_OK_CHECK(TAG, set_websocket_transport_optional_settings(client, WS_OVER_TCP_SCHEME), return ESP_FAIL;)
} else if (strcasecmp(client->config->scheme, WS_OVER_TLS_SCHEME) == 0) {
esp_transport_handle_t ssl = esp_transport_ssl_init();
ESP_WS_CLIENT_MEM_CHECK(TAG, ssl, return ESP_ERR_NO_MEM);
esp_transport_set_default_port(ssl, WEBSOCKET_SSL_DEFAULT_PORT);
esp_transport_list_add(client->transport_list, ssl, "_ssl"); // need to save to transport list, for cleanup
if (client->keep_alive_cfg.keep_alive_enable) {
esp_transport_ssl_set_keep_alive(ssl, &client->keep_alive_cfg);
}
if (client->if_name) {
esp_transport_ssl_set_interface_name(ssl, client->if_name);
}
if (client->config->use_global_ca_store == true) {
esp_transport_ssl_enable_global_ca_store(ssl);
} else if (client->config->cert) {
if (!client->config->cert_len) {
esp_transport_ssl_set_cert_data(ssl, client->config->cert, strlen(client->config->cert));
} else {
esp_transport_ssl_set_cert_data_der(ssl, client->config->cert, client->config->cert_len);
}
}
if (client->config->client_cert) {
if (!client->config->client_cert_len) {
esp_transport_ssl_set_client_cert_data(ssl, client->config->client_cert, strlen(client->config->client_cert));
} else {
esp_transport_ssl_set_client_cert_data_der(ssl, client->config->client_cert, client->config->client_cert_len);
}
}
if (client->config->client_key) {
if (!client->config->client_key_len) {
esp_transport_ssl_set_client_key_data(ssl, client->config->client_key, strlen(client->config->client_key));
} else {
esp_transport_ssl_set_client_key_data_der(ssl, client->config->client_key, client->config->client_key_len);
}
#if CONFIG_ESP_TLS_USE_DS_PERIPHERAL
} else if (client->config->client_ds_data) {
esp_transport_ssl_set_ds_data(ssl, client->config->client_ds_data);
#endif
}
if (client->config->crt_bundle_attach) {
#ifdef CONFIG_MBEDTLS_CERTIFICATE_BUNDLE
esp_transport_ssl_crt_bundle_attach(ssl, client->config->crt_bundle_attach);
#else //CONFIG_MBEDTLS_CERTIFICATE_BUNDLE
ESP_LOGE(TAG, "crt_bundle_attach configured but not enabled in menuconfig: Please enable MBEDTLS_CERTIFICATE_BUNDLE option");
#endif
}
if (client->config->skip_cert_common_name_check) {
esp_transport_ssl_skip_common_name_check(ssl);
}
if (client->config->cert_common_name) {
#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 1, 0)
esp_transport_ssl_set_common_name(ssl, client->config->cert_common_name);
#else
ESP_LOGE(TAG, "cert_common_name requires ESP-IDF 5.1.0 or later");
#endif
}
esp_transport_handle_t wss = esp_transport_ws_init(ssl);
ESP_WS_CLIENT_MEM_CHECK(TAG, wss, return ESP_ERR_NO_MEM);
esp_transport_set_default_port(wss, WEBSOCKET_SSL_DEFAULT_PORT);
esp_transport_list_add(client->transport_list, wss, WS_OVER_TLS_SCHEME);
ESP_WS_CLIENT_ERR_OK_CHECK(TAG, set_websocket_transport_optional_settings(client, WS_OVER_TLS_SCHEME), return ESP_FAIL;)
} else {
ESP_LOGE(TAG, "Not support this websocket scheme %s, only support %s and %s", client->config->scheme, WS_OVER_TCP_SCHEME, WS_OVER_TLS_SCHEME);
return ESP_FAIL;
}
return ESP_OK;
}
static int esp_websocket_client_send_with_exact_opcode(esp_websocket_client_handle_t client, ws_transport_opcodes_t opcode, const uint8_t *data, int len, TickType_t timeout)
{
int ret = -1;
int need_write = len;
int wlen = 0, widx = 0;
bool contained_fin = opcode & WS_TRANSPORT_OPCODES_FIN;
if (client == NULL || len < 0 || (data == NULL && len > 0)) {
ESP_LOGE(TAG, "Invalid arguments");
return -1;
}
if (!esp_websocket_client_is_connected(client)) {
ESP_LOGE(TAG, "Websocket client is not connected");
return -1;
}
if (client->transport == NULL) {
ESP_LOGE(TAG, "Invalid transport");
return -1;
}
if (xSemaphoreTakeRecursive(client->lock, timeout) != pdPASS) {
ESP_LOGE(TAG, "Could not lock ws-client within %" PRIu32 " timeout", timeout);
return -1;
}
if (esp_websocket_new_buf(client, true) != ESP_OK) {
ESP_LOGE(TAG, "Failed to setup tx buffer");
goto unlock_and_return;
}
while (widx < len || opcode) { // allow for sending "current_opcode" only message with len==0
if (need_write > client->buffer_size) {
need_write = client->buffer_size;
opcode = opcode & ~WS_TRANSPORT_OPCODES_FIN;
} else if (contained_fin) {
opcode = opcode | WS_TRANSPORT_OPCODES_FIN;
}
memcpy(client->tx_buffer, data + widx, need_write);
// send with ws specific way and specific opcode
wlen = esp_transport_ws_send_raw(client->transport, opcode, (char *)client->tx_buffer, need_write,
(timeout == portMAX_DELAY) ? -1 : timeout * portTICK_PERIOD_MS);
if (wlen < 0 || (wlen == 0 && need_write != 0)) {
ret = wlen;
esp_websocket_free_buf(client, true);
esp_tls_error_handle_t error_handle = esp_transport_get_error_handle(client->transport);
if (error_handle) {
esp_websocket_client_error(client, "esp_transport_write() returned %d, transport_error=%s, tls_error_code=%i, tls_flags=%i, errno=%d",
ret, esp_err_to_name(error_handle->last_error), error_handle->esp_tls_error_code,
error_handle->esp_tls_flags, errno);
} else {
esp_websocket_client_error(client, "esp_transport_write() returned %d, errno=%d", ret, errno);
}
esp_websocket_client_abort_connection(client, WEBSOCKET_ERROR_TYPE_TCP_TRANSPORT);
goto unlock_and_return;
}
opcode = 0;
widx += wlen;
need_write = len - widx;
}
esp_websocket_free_buf(client, true);
ret = widx;
unlock_and_return:
xSemaphoreGiveRecursive(client->lock);
return ret;
}
esp_websocket_client_handle_t esp_websocket_client_init(const esp_websocket_client_config_t *config)
{
esp_websocket_client_handle_t client = calloc(1, sizeof(struct esp_websocket_client));
ESP_WS_CLIENT_MEM_CHECK(TAG, client, return NULL);
esp_event_loop_args_t event_args = {
.queue_size = WEBSOCKET_EVENT_QUEUE_SIZE,
.task_name = NULL // no task will be created
};
if (esp_event_loop_create(&event_args, &client->event_handle) != ESP_OK) {
ESP_LOGE(TAG, "Error create event handler for websocket client");
free(client);
return NULL;
}
if (config->keep_alive_enable == true) {
client->keep_alive_cfg.keep_alive_enable = true;
client->keep_alive_cfg.keep_alive_idle = (config->keep_alive_idle == 0) ? WEBSOCKET_KEEP_ALIVE_IDLE : config->keep_alive_idle;
client->keep_alive_cfg.keep_alive_interval = (config->keep_alive_interval == 0) ? WEBSOCKET_KEEP_ALIVE_INTERVAL : config->keep_alive_interval;
client->keep_alive_cfg.keep_alive_count = (config->keep_alive_count == 0) ? WEBSOCKET_KEEP_ALIVE_COUNT : config->keep_alive_count;
}
if (config->if_name) {
client->if_name = calloc(1, sizeof(struct ifreq) + 1);
ESP_WS_CLIENT_MEM_CHECK(TAG, client->if_name, goto _websocket_init_fail);
memcpy(client->if_name, config->if_name, sizeof(struct ifreq));
}
client->lock = xSemaphoreCreateRecursiveMutex();
ESP_WS_CLIENT_MEM_CHECK(TAG, client->lock, goto _websocket_init_fail);
client->config = calloc(1, sizeof(websocket_config_storage_t));
ESP_WS_CLIENT_MEM_CHECK(TAG, client->config, goto _websocket_init_fail);
if (config->transport == WEBSOCKET_TRANSPORT_OVER_TCP) {
asprintf(&client->config->scheme, WS_OVER_TCP_SCHEME);
ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->scheme, goto _websocket_init_fail);
} else if (config->transport == WEBSOCKET_TRANSPORT_OVER_SSL) {
asprintf(&client->config->scheme, WS_OVER_TLS_SCHEME);
ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->scheme, goto _websocket_init_fail);
}
if (!config->disable_auto_reconnect && config->reconnect_timeout_ms <= 0) {
client->wait_timeout_ms = WEBSOCKET_RECONNECT_TIMEOUT_MS;
ESP_LOGW(TAG, "`reconnect_timeout_ms` is not set, or it is less than or equal to zero, using default time out %d (milliseconds)", WEBSOCKET_RECONNECT_TIMEOUT_MS);
} else {
client->wait_timeout_ms = config->reconnect_timeout_ms;
}
// configure ssl related parameters
if (config->cert_common_name != NULL && config->skip_cert_common_name_check) {
ESP_LOGE(TAG, "Both cert_common_name and skip_cert_common_name_check are set, only one of them can be set");
goto _websocket_init_fail;
}
client->config->use_global_ca_store = config->use_global_ca_store;
client->config->cert = config->cert_pem;
client->config->cert_len = config->cert_len;
client->config->client_cert = config->client_cert;
client->config->client_cert_len = config->client_cert_len;
client->config->client_key = config->client_key;
client->config->client_key_len = config->client_key_len;
#if CONFIG_ESP_TLS_USE_DS_PERIPHERAL
client->config->client_ds_data = config->client_ds_data;
#endif
client->config->skip_cert_common_name_check = config->skip_cert_common_name_check;
client->config->cert_common_name = config->cert_common_name;
client->config->crt_bundle_attach = config->crt_bundle_attach;
client->config->ext_transport = config->ext_transport;
if (config->uri) {
if (esp_websocket_client_set_uri(client, config->uri) != ESP_OK) {
ESP_LOGE(TAG, "Invalid uri");
goto _websocket_init_fail;
}
}
if (esp_websocket_client_set_config(client, config) != ESP_OK) {
ESP_LOGE(TAG, "Failed to set the configuration");
goto _websocket_init_fail;
}
if (client->config->scheme == NULL) {
asprintf(&client->config->scheme, WS_OVER_TCP_SCHEME);
ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->scheme, goto _websocket_init_fail);
}
client->keepalive_tick_ms = _tick_get_ms();
client->reconnect_tick_ms = _tick_get_ms();
client->ping_tick_ms = _tick_get_ms();
client->wait_for_pong_resp = false;
client->selected_for_destroying = false;
int buffer_size = config->buffer_size;
if (buffer_size <= 0) {
buffer_size = WEBSOCKET_BUFFER_SIZE_BYTE;
}
client->errormsg_buffer = NULL;
client->errormsg_size = 0;
#ifndef CONFIG_ESP_WS_CLIENT_ENABLE_DYNAMIC_BUFFER
client->rx_buffer = malloc(buffer_size);
ESP_WS_CLIENT_MEM_CHECK(TAG, client->rx_buffer, {
goto _websocket_init_fail;
});
client->tx_buffer = malloc(buffer_size);
ESP_WS_CLIENT_MEM_CHECK(TAG, client->tx_buffer, {
goto _websocket_init_fail;
});
#endif
client->status_bits = xEventGroupCreate();
ESP_WS_CLIENT_MEM_CHECK(TAG, client->status_bits, {
goto _websocket_init_fail;
});
xEventGroupSetBits(client->status_bits, STOPPED_BIT);
client->buffer_size = buffer_size;
return client;
_websocket_init_fail:
esp_websocket_client_destroy(client);
return NULL;
}
esp_err_t esp_websocket_client_destroy(esp_websocket_client_handle_t client)
{
if (client == NULL) {
return ESP_ERR_INVALID_ARG;
}
if (client->status_bits && (STOPPED_BIT & xEventGroupGetBits(client->status_bits)) == 0) {
stop_wait_task(client);
}
destroy_and_free_resources(client);
return ESP_OK;
}
esp_err_t esp_websocket_client_destroy_on_exit(esp_websocket_client_handle_t client)
{
if (client == NULL) {
return ESP_ERR_INVALID_ARG;
}
client->selected_for_destroying = true;
return ESP_OK;
}
esp_err_t esp_websocket_client_set_uri(esp_websocket_client_handle_t client, const char *uri)
{
if (client == NULL || uri == NULL) {
return ESP_ERR_INVALID_ARG;
}
struct http_parser_url puri;
http_parser_url_init(&puri);
int parser_status = http_parser_parse_url(uri, strlen(uri), 0, &puri);
if (parser_status != 0) {
ESP_LOGE(TAG, "Error parse uri = %s", uri);
return ESP_FAIL;
}
if (puri.field_data[UF_SCHEMA].len) {
free(client->config->scheme);
asprintf(&client->config->scheme, "%.*s", puri.field_data[UF_SCHEMA].len, uri + puri.field_data[UF_SCHEMA].off);
ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->scheme, return ESP_ERR_NO_MEM);
}
if (puri.field_data[UF_HOST].len) {
free(client->config->host);
asprintf(&client->config->host, "%.*s", puri.field_data[UF_HOST].len, uri + puri.field_data[UF_HOST].off);
ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->host, return ESP_ERR_NO_MEM);
}
if (puri.field_data[UF_PATH].len || puri.field_data[UF_QUERY].len) {
free(client->config->path);
if (puri.field_data[UF_QUERY].len == 0) {
asprintf(&client->config->path, "%.*s", puri.field_data[UF_PATH].len, uri + puri.field_data[UF_PATH].off);
} else if (puri.field_data[UF_PATH].len == 0) {
asprintf(&client->config->path, "/?%.*s", puri.field_data[UF_QUERY].len, uri + puri.field_data[UF_QUERY].off);
} else {
asprintf(&client->config->path, "%.*s?%.*s", puri.field_data[UF_PATH].len, uri + puri.field_data[UF_PATH].off,
puri.field_data[UF_QUERY].len, uri + puri.field_data[UF_QUERY].off);
}
ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->path, return ESP_ERR_NO_MEM);
}
if (puri.field_data[UF_PORT].off) {
client->config->port = strtol((const char *)(uri + puri.field_data[UF_PORT].off), NULL, 10);
}
if (puri.field_data[UF_USERINFO].len) {
char *user_info = NULL;
asprintf(&user_info, "%.*s", puri.field_data[UF_USERINFO].len, uri + puri.field_data[UF_USERINFO].off);
if (user_info) {
char *pass = strchr(user_info, ':');
if (pass) {
pass[0] = 0; //terminal username
pass ++;
free(client->config->password);
client->config->password = strdup(pass);
ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->password, return ESP_ERR_NO_MEM);
}
free(client->config->username);
client->config->username = strdup(user_info);
ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->username, return ESP_ERR_NO_MEM);
free(user_info);
} else {
return ESP_ERR_NO_MEM;
}
}
return ESP_OK;
}
esp_err_t esp_websocket_client_set_headers(esp_websocket_client_handle_t client, const char *headers)
{
if (client == NULL || client->state != WEBSOCKET_STATE_CONNECTED || headers == NULL) {
return ESP_ERR_INVALID_ARG;
}
xSemaphoreTakeRecursive(client->lock, portMAX_DELAY);
esp_err_t ret = esp_transport_ws_set_headers(client->transport, headers);
xSemaphoreGiveRecursive(client->lock);
return ret;
}
esp_err_t esp_websocket_client_append_header(esp_websocket_client_handle_t client, const char *key, const char *value)
{
// Validate the input parameters
if (client == NULL || key == NULL || value == NULL) {
return ESP_ERR_INVALID_ARG;
}
websocket_config_storage_t *cfg = client->config;
// Calculate the length for "key: value\r\n"
size_t len = strlen(key) + strlen(value) + 5; // 5 accounts for ": \r\n" and null-terminator
// If no previous headers exist
if (cfg->headers == NULL) {
cfg->headers = (char *)malloc(len);
if (cfg->headers == NULL) {
ESP_LOGE(TAG, "Failed to allocate...");
return ESP_ERR_NO_MEM;
}
snprintf(cfg->headers, len, "%s: %s\r\n", key, value);
return ESP_OK;
}
// Extend the current headers to accommodate the new key-value pair
size_t current_len = strlen(cfg->headers);
size_t new_len = current_len + len;
// Allocate memory for new headers
char *new_headers = (char *)malloc(new_len);
if (new_headers == NULL) {
ESP_LOGE(TAG, "Failed to allocate...");
return ESP_ERR_NO_MEM;
}
// Copy old headers and append the new header
strcpy(new_headers, cfg->headers);
snprintf(new_headers + current_len, len, "%s: %s\r\n", key, value);
// Free old headers and assign the new header pointer to cfg->headers
free(cfg->headers);
cfg->headers = new_headers;
return ESP_OK;
}
static esp_err_t esp_websocket_client_recv(esp_websocket_client_handle_t client)
{
int rlen;
client->payload_offset = 0;
if (esp_websocket_new_buf(client, false) != ESP_OK) {
ESP_LOGE(TAG, "Failed to setup rx buffer");
return ESP_FAIL;
}
do {
rlen = esp_transport_read(client->transport, client->rx_buffer, client->buffer_size, client->config->network_timeout_ms);
if (rlen < 0) {
esp_websocket_free_buf(client, false);
esp_tls_error_handle_t error_handle = esp_transport_get_error_handle(client->transport);
if (error_handle) {
esp_websocket_client_error(client, "esp_transport_read() failed with %d, transport_error=%s, tls_error_code=%i, tls_flags=%i, errno=%d",
rlen, esp_err_to_name(error_handle->last_error), error_handle->esp_tls_error_code,
error_handle->esp_tls_flags, errno);
} else {
esp_websocket_client_error(client, "esp_transport_read() failed with %d, errno=%d", rlen, errno);
}
return ESP_FAIL;
}
client->payload_len = esp_transport_ws_get_read_payload_len(client->transport);
client->last_fin = esp_transport_ws_get_fin_flag(client->transport);
client->last_opcode = esp_transport_ws_get_read_opcode(client->transport);
if (rlen == 0 && client->last_opcode == WS_TRANSPORT_OPCODES_NONE ) {
ESP_LOGV(TAG, "esp_transport_read timeouts");
esp_websocket_free_buf(client, false);
return ESP_OK;
}
esp_websocket_client_dispatch_event(client, WEBSOCKET_EVENT_DATA, client->rx_buffer, rlen);
client->payload_offset += rlen;
} while (client->payload_offset < client->payload_len);
// if a PING message received -> send out the PONG, this will not work for PING messages with payload longer than buffer len
if (client->last_opcode == WS_TRANSPORT_OPCODES_PING) {
const char *data = (client->payload_len == 0) ? NULL : client->rx_buffer;
ESP_LOGD(TAG, "Sending PONG with payload len=%d", client->payload_len);
esp_transport_ws_send_raw(client->transport, WS_TRANSPORT_OPCODES_PONG | WS_TRANSPORT_OPCODES_FIN, data, client->payload_len,
client->config->network_timeout_ms);
} else if (client->last_opcode == WS_TRANSPORT_OPCODES_PONG) {
client->wait_for_pong_resp = false;
} else if (client->last_opcode == WS_TRANSPORT_OPCODES_CLOSE) {
ESP_LOGD(TAG, "Received close frame");
client->state = WEBSOCKET_STATE_CLOSING;
}
esp_websocket_free_buf(client, false);
return ESP_OK;
}
static int esp_websocket_client_send_close(esp_websocket_client_handle_t client, int code, const char *additional_data, int total_len, TickType_t timeout);
static void esp_websocket_client_task(void *pv)
{
const int lock_timeout = portMAX_DELAY;
esp_websocket_client_handle_t client = (esp_websocket_client_handle_t) pv;
client->run = true;
//get transport by scheme
if (client->transport == NULL && client->config->ext_transport == NULL) {
client->transport = esp_transport_list_get_transport(client->transport_list, client->config->scheme);
}
if (client->transport == NULL) {
ESP_LOGE(TAG, "There are no transports valid, stop websocket client");
client->run = false;
}
//default port
if (client->config->port == 0) {
client->config->port = esp_transport_get_default_port(client->transport);
}