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/*
* SPDX-FileCopyrightText: 2018-2023 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <string.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <errno.h>
#include <esp_log.h>
#include <esp_err.h>
#include <assert.h>
#include <netinet/tcp.h>
#include <esp_http_server.h>
#include "esp_httpd_priv.h"
#include "ctrl_sock.h"
#if CONFIG_HTTPD_QUEUE_WORK_BLOCKING
#include "freertos/semphr.h"
#endif
#if defined(CONFIG_LWIP_MAX_SOCKETS)
#define HTTPD_MAX_SOCKETS CONFIG_LWIP_MAX_SOCKETS
#else
/* LwIP component is not included into the build, use a default value */
#define HTTPD_MAX_SOCKETS 15
#endif
static const int DEFAULT_KEEP_ALIVE_IDLE = 5;
static const int DEFAULT_KEEP_ALIVE_INTERVAL= 5;
static const int DEFAULT_KEEP_ALIVE_COUNT= 3;
typedef struct {
fd_set *fdset;
struct httpd_data *hd;
} process_session_context_t;
static const char *TAG = "httpd";
ESP_EVENT_DEFINE_BASE(ESP_HTTP_SERVER_EVENT);
void esp_http_server_dispatch_event(int32_t event_id, const void* event_data, size_t event_data_size)
{
esp_err_t err = esp_event_post(ESP_HTTP_SERVER_EVENT, event_id, event_data, event_data_size, ESP_HTTP_SERVER_EVENT_POST_TIMEOUT);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to post esp_http_server event: %s", esp_err_to_name(err));
}
}
static esp_err_t httpd_accept_conn(struct httpd_data *hd, int listen_fd)
{
/* If no space is available for new session, close the least recently used one */
if (hd->config.lru_purge_enable == true) {
if (!httpd_is_sess_available(hd)) {
/* Queue asynchronous closure of the least recently used session */
return httpd_sess_close_lru(hd);
/* Returning from this allows the main server thread to process
* the queued asynchronous control message for closing LRU session.
* Since connection request hasn't been addressed yet using accept()
* therefore httpd_accept_conn() will be called again, but this time
* with space available for one session
*/
}
}
struct sockaddr_storage addr_from;
socklen_t addr_from_len = sizeof(addr_from);
int new_fd = accept(listen_fd, (struct sockaddr *)&addr_from, &addr_from_len);
if (new_fd < 0) {
ESP_LOGE(TAG, LOG_FMT("error in accept (%d)"), errno);
return ESP_FAIL;
}
ESP_LOGD(TAG, LOG_FMT("newfd = %d"), new_fd);
struct timeval tv;
/* Set recv timeout of this fd as per config */
tv.tv_sec = hd->config.recv_wait_timeout;
tv.tv_usec = 0;
if (setsockopt(new_fd, SOL_SOCKET, SO_RCVTIMEO, (const char *)&tv, sizeof(tv)) < 0) {
ESP_LOGE(TAG, LOG_FMT("error in setsockopt SO_RCVTIMEO (%d)"), errno);
goto exit;
}
/* Set send timeout of this fd as per config */
tv.tv_sec = hd->config.send_wait_timeout;
tv.tv_usec = 0;
if (setsockopt(new_fd, SOL_SOCKET, SO_SNDTIMEO, (const char *)&tv, sizeof(tv)) < 0) {
ESP_LOGE(TAG, LOG_FMT("error in setsockopt SO_SNDTIMEO (%d)"), errno);
goto exit;
}
if (hd->config.keep_alive_enable) {
int keep_alive_enable = 1;
int keep_alive_idle = hd->config.keep_alive_idle ? hd->config.keep_alive_idle : DEFAULT_KEEP_ALIVE_IDLE;
int keep_alive_interval = hd->config.keep_alive_interval ? hd->config.keep_alive_interval : DEFAULT_KEEP_ALIVE_INTERVAL;
int keep_alive_count = hd->config.keep_alive_count ? hd->config.keep_alive_count : DEFAULT_KEEP_ALIVE_COUNT;
ESP_LOGD(TAG, "Enable TCP keep alive. idle: %d, interval: %d, count: %d", keep_alive_idle, keep_alive_interval, keep_alive_count);
if (setsockopt(new_fd, SOL_SOCKET, SO_KEEPALIVE, &keep_alive_enable, sizeof(keep_alive_enable)) < 0) {
ESP_LOGE(TAG, LOG_FMT("error in setsockopt SO_KEEPALIVE (%d)"), errno);
goto exit;
}
#ifndef __APPLE__
if (setsockopt(new_fd, IPPROTO_TCP, TCP_KEEPIDLE, &keep_alive_idle, sizeof(keep_alive_idle)) < 0) {
ESP_LOGE(TAG, LOG_FMT("error in setsockopt TCP_KEEPIDLE (%d)"), errno);
goto exit;
}
if (setsockopt(new_fd, IPPROTO_TCP, TCP_KEEPINTVL, &keep_alive_interval, sizeof(keep_alive_interval)) < 0) {
ESP_LOGE(TAG, LOG_FMT("error in setsockopt TCP_KEEPINTVL (%d)"), errno);
goto exit;
}
if (setsockopt(new_fd, IPPROTO_TCP, TCP_KEEPCNT, &keep_alive_count, sizeof(keep_alive_count)) < 0) {
ESP_LOGE(TAG, LOG_FMT("error in setsockopt TCP_KEEPCNT (%d)"), errno);
goto exit;
}
#else // __APPLE__
if (setsockopt(new_fd, IPPROTO_TCP, TCP_KEEPALIVE, &keep_alive_idle, sizeof(keep_alive_idle)) < 0) {
ESP_LOGE(TAG, LOG_FMT("error in setsockopt TCP_KEEPALIVE (%d)"), errno);
goto exit;
}
#endif // __APPLE__
}
if (ESP_OK != httpd_sess_new(hd, new_fd)) {
ESP_LOGE(TAG, LOG_FMT("session creation failed"));
goto exit;
}
ESP_LOGD(TAG, LOG_FMT("complete"));
esp_http_server_dispatch_event(HTTP_SERVER_EVENT_ON_CONNECTED, &new_fd, sizeof(int));
return ESP_OK;
exit:
close(new_fd);
return ESP_FAIL;
}
struct httpd_ctrl_data {
enum httpd_ctrl_msg {
HTTPD_CTRL_SHUTDOWN,
HTTPD_CTRL_WORK,
} hc_msg;
httpd_work_fn_t hc_work;
void *hc_work_arg;
};
esp_err_t httpd_queue_work(httpd_handle_t handle, httpd_work_fn_t work, void *arg)
{
if (handle == NULL || work == NULL) {
return ESP_ERR_INVALID_ARG;
}
struct httpd_data *hd = (struct httpd_data *) handle;
struct httpd_ctrl_data msg = {
.hc_msg = HTTPD_CTRL_WORK,
.hc_work = work,
.hc_work_arg = arg,
};
#if CONFIG_HTTPD_QUEUE_WORK_BLOCKING
// Semaphore is acquired here and released after work function is executed.
if (xSemaphoreTake(hd->ctrl_sock_semaphore, portMAX_DELAY) == pdTRUE) {
#endif
int ret = cs_send_to_ctrl_sock(hd->msg_fd, hd->config.ctrl_port, &msg, sizeof(msg));
if (ret < 0) {
ESP_LOGW(TAG, LOG_FMT("failed to queue work"));
#if CONFIG_HTTPD_QUEUE_WORK_BLOCKING
xSemaphoreGive(hd->ctrl_sock_semaphore);
#endif
return ESP_FAIL;
}
return ESP_OK;
#if CONFIG_HTTPD_QUEUE_WORK_BLOCKING
}
ESP_LOGE(TAG, "Unable to acquire semaphore");
return ESP_FAIL;
#endif
}
esp_err_t httpd_get_client_list(httpd_handle_t handle, size_t *fds, int *client_fds)
{
struct httpd_data *hd = (struct httpd_data *) handle;
if (hd == NULL || fds == NULL || *fds == 0 || client_fds == NULL) {
return ESP_ERR_INVALID_ARG;
}
size_t max_fds = *fds;
*fds = 0;
for (int i = 0; i < hd->config.max_open_sockets; ++i) {
if (hd->hd_sd[i].fd != -1) {
if (*fds < max_fds) {
client_fds[(*fds)++] = hd->hd_sd[i].fd;
} else {
return ESP_ERR_INVALID_ARG;
}
}
}
return ESP_OK;
}
void *httpd_get_global_user_ctx(httpd_handle_t handle)
{
return ((struct httpd_data *)handle)->config.global_user_ctx;
}
void *httpd_get_global_transport_ctx(httpd_handle_t handle)
{
return ((struct httpd_data *)handle)->config.global_transport_ctx;
}
static void httpd_process_ctrl_msg(struct httpd_data *hd)
{
struct httpd_ctrl_data msg;
int ret = recv(hd->ctrl_fd, &msg, sizeof(msg), 0);
if (ret <= 0) {
ESP_LOGW(TAG, LOG_FMT("error in recv (%d)"), errno);
#if CONFIG_HTTPD_QUEUE_WORK_BLOCKING
xSemaphoreGive(hd->ctrl_sock_semaphore);
#endif
return;
}
if (ret != sizeof(msg)) {
ESP_LOGW(TAG, LOG_FMT("incomplete msg"));
#if CONFIG_HTTPD_QUEUE_WORK_BLOCKING
xSemaphoreGive(hd->ctrl_sock_semaphore);
#endif
return;
}
switch (msg.hc_msg) {
case HTTPD_CTRL_WORK:
if (msg.hc_work) {
ESP_LOGD(TAG, LOG_FMT("work"));
(*msg.hc_work)(msg.hc_work_arg);
}
break;
case HTTPD_CTRL_SHUTDOWN:
ESP_LOGD(TAG, LOG_FMT("shutdown"));
hd->hd_td.status = THREAD_STOPPING;
break;
default:
break;
}
#if CONFIG_HTTPD_QUEUE_WORK_BLOCKING
xSemaphoreGive(hd->ctrl_sock_semaphore);
#endif
}
// Called for each session from httpd_server
static int httpd_process_session(struct sock_db *session, void *context)
{
if ((!session) || (!context)) {
return 0;
}
if (session->fd < 0) {
return 1;
}
// session is busy in an async task, do not process here.
if (session->for_async_req) {
return 1;
}
process_session_context_t *ctx = (process_session_context_t *)context;
int fd = session->fd;
if (FD_ISSET(fd, ctx->fdset) || httpd_sess_pending(ctx->hd, session)) {
ESP_LOGD(TAG, LOG_FMT("processing socket %d"), fd);
if (httpd_sess_process(ctx->hd, session) != ESP_OK) {
httpd_sess_delete(ctx->hd, session); // Delete session
}
}
return 1;
}
/* Manage in-coming connection or data requests */
static esp_err_t httpd_server(struct httpd_data *hd)
{
fd_set read_set;
FD_ZERO(&read_set);
if (hd->config.lru_purge_enable || httpd_is_sess_available(hd)) {
/* Only listen for new connections if server has capacity to
* handle more (or when LRU purge is enabled, in which case
* older connections will be closed) */
FD_SET(hd->listen_fd, &read_set);
}
FD_SET(hd->ctrl_fd, &read_set);
int tmp_max_fd;
httpd_sess_set_descriptors(hd, &read_set, &tmp_max_fd);
int maxfd = MAX(hd->listen_fd, tmp_max_fd);
tmp_max_fd = maxfd;
maxfd = MAX(hd->ctrl_fd, tmp_max_fd);
ESP_LOGD(TAG, LOG_FMT("doing select maxfd+1 = %d"), maxfd + 1);
int active_cnt = select(maxfd + 1, &read_set, NULL, NULL, NULL);
if (active_cnt < 0) {
ESP_LOGE(TAG, LOG_FMT("error in select (%d)"), errno);
httpd_sess_delete_invalid(hd);
return ESP_OK;
}
/* Case0: Do we have a control message? */
if (FD_ISSET(hd->ctrl_fd, &read_set)) {
ESP_LOGD(TAG, LOG_FMT("processing ctrl message"));
httpd_process_ctrl_msg(hd);
if (hd->hd_td.status == THREAD_STOPPING) {
ESP_LOGD(TAG, LOG_FMT("stopping thread"));
return ESP_FAIL;
}
}
/* Case1: Do we have any activity on the current data
* sessions? */
process_session_context_t context = {
.fdset = &read_set,
.hd = hd
};
httpd_sess_enum(hd, httpd_process_session, &context);
/* Case2: Do we have any incoming connection requests to
* process? */
if (FD_ISSET(hd->listen_fd, &read_set)) {
ESP_LOGD(TAG, LOG_FMT("processing listen socket %d"), hd->listen_fd);
if (httpd_accept_conn(hd, hd->listen_fd) != ESP_OK) {
ESP_LOGW(TAG, LOG_FMT("error accepting new connection"));
}
}
return ESP_OK;
}
/* The main HTTPD thread */
static void httpd_thread(void *arg)
{
int ret;
struct httpd_data *hd = (struct httpd_data *) arg;
hd->hd_td.status = THREAD_RUNNING;
ESP_LOGD(TAG, LOG_FMT("web server started"));
while (1) {
ret = httpd_server(hd);
if (ret != ESP_OK) {
break;
}
}
ESP_LOGD(TAG, LOG_FMT("web server exiting"));
close(hd->msg_fd);
cs_free_ctrl_sock(hd->ctrl_fd);
httpd_sess_close_all(hd);
close(hd->listen_fd);
hd->hd_td.status = THREAD_STOPPED;
httpd_os_thread_delete();
}
static esp_err_t httpd_server_init(struct httpd_data *hd)
{
#if CONFIG_LWIP_IPV6
int fd = socket(PF_INET6, SOCK_STREAM, 0);
#else
int fd = socket(PF_INET, SOCK_STREAM, 0);
#endif
if (fd < 0) {
ESP_LOGE(TAG, LOG_FMT("error in socket (%d)"), errno);
return ESP_FAIL;
}
#if CONFIG_LWIP_IPV6
struct in6_addr inaddr_any = IN6ADDR_ANY_INIT;
struct sockaddr_in6 serv_addr = {
.sin6_family = PF_INET6,
.sin6_addr = inaddr_any,
.sin6_port = htons(hd->config.server_port)
};
#else
struct sockaddr_in serv_addr = {
.sin_family = PF_INET,
.sin_addr = {
.s_addr = htonl(INADDR_ANY)
},
.sin_port = htons(hd->config.server_port)
};
#endif
/* Enable SO_REUSEADDR to allow binding to the same
* address and port when restarting the server */
int enable = 1;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable)) < 0) {
/* This will fail if CONFIG_LWIP_SO_REUSE is not enabled. But
* it does not affect the normal working of the HTTP Server */
ESP_LOGW(TAG, LOG_FMT("error in setsockopt SO_REUSEADDR (%d)"), errno);
}
int ret = bind(fd, (struct sockaddr *)&serv_addr, sizeof(serv_addr));
if (ret < 0) {
ESP_LOGE(TAG, LOG_FMT("error in bind (%d)"), errno);
close(fd);
return ESP_FAIL;
}
ret = listen(fd, hd->config.backlog_conn);
if (ret < 0) {
ESP_LOGE(TAG, LOG_FMT("error in listen (%d)"), errno);
close(fd);
return ESP_FAIL;
}
int ctrl_fd = cs_create_ctrl_sock(hd->config.ctrl_port);
if (ctrl_fd < 0) {
ESP_LOGE(TAG, LOG_FMT("error in creating ctrl socket (%d)"), errno);
close(fd);
return ESP_FAIL;
}
int msg_fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (msg_fd < 0) {
ESP_LOGE(TAG, LOG_FMT("error in creating msg socket (%d)"), errno);
close(fd);
close(ctrl_fd);
return ESP_FAIL;
}
hd->listen_fd = fd;
hd->ctrl_fd = ctrl_fd;
hd->msg_fd = msg_fd;
return ESP_OK;
}
static struct httpd_data *httpd_create(const httpd_config_t *config)
{
/* Allocate memory for httpd instance data */
struct httpd_data *hd = calloc(1, sizeof(struct httpd_data));
if (!hd) {
ESP_LOGE(TAG, LOG_FMT("Failed to allocate memory for HTTP server instance"));
return NULL;
}
hd->hd_calls = calloc(config->max_uri_handlers, sizeof(httpd_uri_t *));
if (!hd->hd_calls) {
ESP_LOGE(TAG, LOG_FMT("Failed to allocate memory for HTTP URI handlers"));
free(hd);
return NULL;
}
hd->hd_sd = calloc(config->max_open_sockets, sizeof(struct sock_db));
if (!hd->hd_sd) {
ESP_LOGE(TAG, LOG_FMT("Failed to allocate memory for HTTP session data"));
free(hd->hd_calls);
free(hd);
return NULL;
}
struct httpd_req_aux *ra = &hd->hd_req_aux;
ra->resp_hdrs = calloc(config->max_resp_headers, sizeof(struct resp_hdr));
if (!ra->resp_hdrs) {
ESP_LOGE(TAG, LOG_FMT("Failed to allocate memory for HTTP response headers"));
free(hd->hd_sd);
free(hd->hd_calls);
free(hd);
return NULL;
}
hd->err_handler_fns = calloc(HTTPD_ERR_CODE_MAX, sizeof(httpd_err_handler_func_t));
if (!hd->err_handler_fns) {
ESP_LOGE(TAG, LOG_FMT("Failed to allocate memory for HTTP error handlers"));
free(ra->resp_hdrs);
free(hd->hd_sd);
free(hd->hd_calls);
free(hd);
return NULL;
}
/* Save the configuration for this instance */
hd->config = *config;
return hd;
}
static void httpd_delete(struct httpd_data *hd)
{
struct httpd_req_aux *ra = &hd->hd_req_aux;
/* Free memory of httpd instance data */
free(hd->err_handler_fns);
free(ra->resp_hdrs);
free(hd->hd_sd);
/* Free registered URI handlers */
httpd_unregister_all_uri_handlers(hd);
free(hd->hd_calls);
free(hd);
}
esp_err_t httpd_start(httpd_handle_t *handle, const httpd_config_t *config)
{
if (handle == NULL || config == NULL) {
return ESP_ERR_INVALID_ARG;
}
/* Sanity check about whether LWIP is configured for providing the
* maximum number of open sockets sufficient for the server. Though,
* this check doesn't guarantee that many sockets will actually be
* available at runtime as other processes may use up some sockets.
* Note that server also uses 3 sockets for its internal use :
* 1) listening for new TCP connections
* 2) for sending control messages over UDP
* 3) for receiving control messages over UDP
* So the total number of required sockets is max_open_sockets + 3
*/
if (HTTPD_MAX_SOCKETS < config->max_open_sockets + 3) {
ESP_LOGE(TAG, "Config option max_open_sockets is too large (max allowed %d, 3 sockets used by HTTP server internally)\n\t"
"Either decrease this or configure LWIP_MAX_SOCKETS to a larger value",
HTTPD_MAX_SOCKETS - 3);
return ESP_ERR_INVALID_ARG;
}
struct httpd_data *hd = httpd_create(config);
if (hd == NULL) {
/* Failed to allocate memory */
return ESP_ERR_HTTPD_ALLOC_MEM;
}
#if CONFIG_HTTPD_QUEUE_WORK_BLOCKING
/* Using a Counting Semaphore with count equals CONFIG_LWIP_UDP_RECVMBOX_SIZE
* as the number of UDP messages which can be stored is equal to UDP mailbox size.
* Using this, we can make sure that the work function is always received by the ctrl socket.
*/
hd->ctrl_sock_semaphore = xSemaphoreCreateCounting(CONFIG_LWIP_UDP_RECVMBOX_SIZE, CONFIG_LWIP_UDP_RECVMBOX_SIZE);
if (hd->ctrl_sock_semaphore == NULL) {
ESP_LOGE(TAG, "Failed to create Semaphore");
httpd_delete(hd);
return ESP_ERR_HTTPD_ALLOC_MEM;
}
#endif
if (httpd_server_init(hd) != ESP_OK) {
httpd_delete(hd);
return ESP_FAIL;
}
httpd_sess_init(hd);
if (httpd_os_thread_create(&hd->hd_td.handle, "httpd",
hd->config.stack_size,
hd->config.task_priority,
httpd_thread, hd,
hd->config.core_id,
hd->config.task_caps) != ESP_OK) {
/* Failed to launch task */
httpd_delete(hd);
return ESP_ERR_HTTPD_TASK;
}
*handle = (httpd_handle_t)hd;
esp_http_server_dispatch_event(HTTP_SERVER_EVENT_START, NULL, 0);
return ESP_OK;
}
esp_err_t httpd_stop(httpd_handle_t handle)
{
struct httpd_data *hd = (struct httpd_data *) handle;
if (hd == NULL) {
return ESP_ERR_INVALID_ARG;
}
struct httpd_ctrl_data msg;
memset(&msg, 0, sizeof(msg));
msg.hc_msg = HTTPD_CTRL_SHUTDOWN;
int ret = 0;
if ((ret = cs_send_to_ctrl_sock(hd->msg_fd, hd->config.ctrl_port, &msg, sizeof(msg))) < 0) {
ESP_LOGE(TAG, "Failed to send shutdown signal err=%d", ret);
return ESP_FAIL;
}
ESP_LOGD(TAG, LOG_FMT("sent control msg to stop server"));
while (hd->hd_td.status != THREAD_STOPPED) {
httpd_os_thread_sleep(100);
}
/* Release global user context, if not NULL */
if (hd->config.global_user_ctx) {
if (hd->config.global_user_ctx_free_fn) {
hd->config.global_user_ctx_free_fn(hd->config.global_user_ctx);
} else {
free(hd->config.global_user_ctx);
}
hd->config.global_user_ctx = NULL;
}
/* Release global transport context, if not NULL */
if (hd->config.global_transport_ctx) {
if (hd->config.global_transport_ctx_free_fn) {
hd->config.global_transport_ctx_free_fn(hd->config.global_transport_ctx);
} else {
free(hd->config.global_transport_ctx);
}
hd->config.global_transport_ctx = NULL;
}
ESP_LOGD(TAG, LOG_FMT("server stopped"));
#if CONFIG_HTTPD_QUEUE_WORK_BLOCKING
vSemaphoreDelete(hd->ctrl_sock_semaphore);
#endif
httpd_delete(hd);
esp_http_server_dispatch_event(HTTP_SERVER_EVENT_STOP, NULL, 0);
return ESP_OK;
}
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