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esp-idf/components/esp_http_server/src/httpd_txrx.c

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// Copyright 2018 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <errno.h>
#include <esp_log.h>
#include <esp_err.h>
#include <esp_http_server.h>
#include "esp_httpd_priv.h"
static const char *TAG = "httpd_txrx";
esp_err_t httpd_sess_set_send_override(httpd_handle_t hd, int sockfd, httpd_send_func_t send_func)
{
struct sock_db *sess = httpd_sess_get(hd, sockfd);
if (!sess) {
return ESP_ERR_INVALID_ARG;
}
sess->send_fn = send_func;
return ESP_OK;
}
esp_err_t httpd_sess_set_recv_override(httpd_handle_t hd, int sockfd, httpd_recv_func_t recv_func)
{
struct sock_db *sess = httpd_sess_get(hd, sockfd);
if (!sess) {
return ESP_ERR_INVALID_ARG;
}
sess->recv_fn = recv_func;
return ESP_OK;
}
esp_err_t httpd_sess_set_pending_override(httpd_handle_t hd, int sockfd, httpd_pending_func_t pending_func)
{
struct sock_db *sess = httpd_sess_get(hd, sockfd);
if (!sess) {
return ESP_ERR_INVALID_ARG;
}
sess->pending_fn = pending_func;
return ESP_OK;
}
int httpd_send(httpd_req_t *r, const char *buf, size_t buf_len)
{
if (r == NULL || buf == NULL) {
return HTTPD_SOCK_ERR_INVALID;
}
if (!httpd_valid_req(r)) {
return HTTPD_SOCK_ERR_INVALID;
}
struct httpd_req_aux *ra = r->aux;
int ret = ra->sd->send_fn(ra->sd->handle, ra->sd->fd, buf, buf_len, 0);
if (ret < 0) {
ESP_LOGD(TAG, LOG_FMT("error in send_fn"));
return ret;
}
return ret;
}
static esp_err_t httpd_send_all(httpd_req_t *r, const char *buf, size_t buf_len)
{
struct httpd_req_aux *ra = r->aux;
int ret;
while (buf_len > 0) {
ret = ra->sd->send_fn(ra->sd->handle, ra->sd->fd, buf, buf_len, 0);
if (ret < 0) {
ESP_LOGD(TAG, LOG_FMT("error in send_fn"));
return ESP_FAIL;
}
ESP_LOGD(TAG, LOG_FMT("sent = %d"), ret);
buf += ret;
buf_len -= ret;
}
return ESP_OK;
}
static size_t httpd_recv_pending(httpd_req_t *r, char *buf, size_t buf_len)
{
struct httpd_req_aux *ra = r->aux;
size_t offset = sizeof(ra->sd->pending_data) - ra->sd->pending_len;
/* buf_len must not be greater than remaining_len */
buf_len = MIN(ra->sd->pending_len, buf_len);
memcpy(buf, ra->sd->pending_data + offset, buf_len);
ra->sd->pending_len -= buf_len;
return buf_len;
}
int httpd_recv_with_opt(httpd_req_t *r, char *buf, size_t buf_len, bool halt_after_pending)
{
ESP_LOGD(TAG, LOG_FMT("requested length = %d"), buf_len);
size_t pending_len = 0;
struct httpd_req_aux *ra = r->aux;
/* First fetch pending data from local buffer */
if (ra->sd->pending_len > 0) {
ESP_LOGD(TAG, LOG_FMT("pending length = %d"), ra->sd->pending_len);
pending_len = httpd_recv_pending(r, buf, buf_len);
buf += pending_len;
buf_len -= pending_len;
/* If buffer filled then no need to recv.
* If asked to halt after receiving pending data then
* return with received length */
if (!buf_len || halt_after_pending) {
return pending_len;
}
}
/* Receive data of remaining length */
int ret = ra->sd->recv_fn(ra->sd->handle, ra->sd->fd, buf, buf_len, 0);
if (ret < 0) {
ESP_LOGD(TAG, LOG_FMT("error in recv_fn"));
if ((ret == HTTPD_SOCK_ERR_TIMEOUT) && (pending_len != 0)) {
/* If recv() timeout occurred, but pending data is
* present, return length of pending data.
* This behavior is similar to that of socket recv()
* function, which, in case has only partially read the
* requested length, due to timeout, returns with read
* length, rather than error */
return pending_len;
}
return ret;
}
ESP_LOGD(TAG, LOG_FMT("received length = %d"), ret + pending_len);
return ret + pending_len;
}
int httpd_recv(httpd_req_t *r, char *buf, size_t buf_len)
{
return httpd_recv_with_opt(r, buf, buf_len, false);
}
size_t httpd_unrecv(struct httpd_req *r, const char *buf, size_t buf_len)
{
struct httpd_req_aux *ra = r->aux;
/* Truncate if external buf_len is greater than pending_data buffer size */
ra->sd->pending_len = MIN(sizeof(ra->sd->pending_data), buf_len);
/* Copy data into internal pending_data buffer with the exact offset
* such that it is right aligned inside the buffer */
size_t offset = sizeof(ra->sd->pending_data) - ra->sd->pending_len;
memcpy(ra->sd->pending_data + offset, buf, ra->sd->pending_len);
ESP_LOGD(TAG, LOG_FMT("length = %d"), ra->sd->pending_len);
return ra->sd->pending_len;
}
/**
* This API appends an additional header field-value pair in the HTTP response.
* But the header isn't sent out until any of the send APIs is executed.
*/
esp_err_t httpd_resp_set_hdr(httpd_req_t *r, const char *field, const char *value)
{
if (r == NULL || field == NULL || value == NULL) {
return ESP_ERR_INVALID_ARG;
}
if (!httpd_valid_req(r)) {
return ESP_ERR_HTTPD_INVALID_REQ;
}
struct httpd_req_aux *ra = r->aux;
struct httpd_data *hd = (struct httpd_data *) r->handle;
/* Number of additional headers is limited */
if (ra->resp_hdrs_count >= hd->config.max_resp_headers) {
return ESP_ERR_HTTPD_RESP_HDR;
}
/* Assign header field-value pair */
ra->resp_hdrs[ra->resp_hdrs_count].field = field;
ra->resp_hdrs[ra->resp_hdrs_count].value = value;
ra->resp_hdrs_count++;
ESP_LOGD(TAG, LOG_FMT("new header = %s: %s"), field, value);
return ESP_OK;
}
/**
* This API sets the status of the HTTP response to the value specified.
* But the status isn't sent out until any of the send APIs is executed.
*/
esp_err_t httpd_resp_set_status(httpd_req_t *r, const char *status)
{
if (r == NULL || status == NULL) {
return ESP_ERR_INVALID_ARG;
}
if (!httpd_valid_req(r)) {
return ESP_ERR_HTTPD_INVALID_REQ;
}
struct httpd_req_aux *ra = r->aux;
ra->status = (char *)status;
return ESP_OK;
}
/**
* This API sets the method/type of the HTTP response to the value specified.
* But the method isn't sent out until any of the send APIs is executed.
*/
esp_err_t httpd_resp_set_type(httpd_req_t *r, const char *type)
{
if (r == NULL || type == NULL) {
return ESP_ERR_INVALID_ARG;
}
if (!httpd_valid_req(r)) {
return ESP_ERR_HTTPD_INVALID_REQ;
}
struct httpd_req_aux *ra = r->aux;
ra->content_type = (char *)type;
return ESP_OK;
}
esp_err_t httpd_resp_send(httpd_req_t *r, const char *buf, ssize_t buf_len)
{
if (r == NULL) {
return ESP_ERR_INVALID_ARG;
}
if (!httpd_valid_req(r)) {
return ESP_ERR_HTTPD_INVALID_REQ;
}
struct httpd_req_aux *ra = r->aux;
const char *httpd_hdr_str = "HTTP/1.1 %s\r\nContent-Type: %s\r\nContent-Length: %d\r\n";
const char *colon_separator = ": ";
const char *cr_lf_seperator = "\r\n";
if (buf_len == HTTPD_RESP_USE_STRLEN) {
buf_len = strlen(buf);
}
/* Request headers are no longer available */
ra->req_hdrs_count = 0;
/* Size of essential headers is limited by scratch buffer size */
if (snprintf(ra->scratch, sizeof(ra->scratch), httpd_hdr_str,
ra->status, ra->content_type, buf_len) >= sizeof(ra->scratch)) {
return ESP_ERR_HTTPD_RESP_HDR;
}
/* Sending essential headers */
if (httpd_send_all(r, ra->scratch, strlen(ra->scratch)) != ESP_OK) {
return ESP_ERR_HTTPD_RESP_SEND;
}
/* Sending additional headers based on set_header */
for (unsigned i = 0; i < ra->resp_hdrs_count; i++) {
/* Send header field */
if (httpd_send_all(r, ra->resp_hdrs[i].field, strlen(ra->resp_hdrs[i].field)) != ESP_OK) {
return ESP_ERR_HTTPD_RESP_SEND;
}
/* Send ': ' */
if (httpd_send_all(r, colon_separator, strlen(colon_separator)) != ESP_OK) {
return ESP_ERR_HTTPD_RESP_SEND;
}
/* Send header value */
if (httpd_send_all(r, ra->resp_hdrs[i].value, strlen(ra->resp_hdrs[i].value)) != ESP_OK) {
return ESP_ERR_HTTPD_RESP_SEND;
}
/* Send CR + LF */
if (httpd_send_all(r, cr_lf_seperator, strlen(cr_lf_seperator)) != ESP_OK) {
return ESP_ERR_HTTPD_RESP_SEND;
}
}
/* End header section */
if (httpd_send_all(r, cr_lf_seperator, strlen(cr_lf_seperator)) != ESP_OK) {
return ESP_ERR_HTTPD_RESP_SEND;
}
/* Sending content */
if (buf && buf_len) {
if (httpd_send_all(r, buf, buf_len) != ESP_OK) {
return ESP_ERR_HTTPD_RESP_SEND;
}
}
return ESP_OK;
}
esp_err_t httpd_resp_send_chunk(httpd_req_t *r, const char *buf, ssize_t buf_len)
{
if (r == NULL) {
return ESP_ERR_INVALID_ARG;
}
if (!httpd_valid_req(r)) {
return ESP_ERR_HTTPD_INVALID_REQ;
}
if (buf_len == HTTPD_RESP_USE_STRLEN) {
buf_len = strlen(buf);
}
struct httpd_req_aux *ra = r->aux;
const char *httpd_chunked_hdr_str = "HTTP/1.1 %s\r\nContent-Type: %s\r\nTransfer-Encoding: chunked\r\n";
const char *colon_separator = ": ";
const char *cr_lf_seperator = "\r\n";
/* Request headers are no longer available */
ra->req_hdrs_count = 0;
if (!ra->first_chunk_sent) {
/* Size of essential headers is limited by scratch buffer size */
if (snprintf(ra->scratch, sizeof(ra->scratch), httpd_chunked_hdr_str,
ra->status, ra->content_type) >= sizeof(ra->scratch)) {
return ESP_ERR_HTTPD_RESP_HDR;
}
/* Sending essential headers */
if (httpd_send_all(r, ra->scratch, strlen(ra->scratch)) != ESP_OK) {
return ESP_ERR_HTTPD_RESP_SEND;
}
/* Sending additional headers based on set_header */
for (unsigned i = 0; i < ra->resp_hdrs_count; i++) {
/* Send header field */
if (httpd_send_all(r, ra->resp_hdrs[i].field, strlen(ra->resp_hdrs[i].field)) != ESP_OK) {
return ESP_ERR_HTTPD_RESP_SEND;
}
/* Send ': ' */
if (httpd_send_all(r, colon_separator, strlen(colon_separator)) != ESP_OK) {
return ESP_ERR_HTTPD_RESP_SEND;
}
/* Send header value */
if (httpd_send_all(r, ra->resp_hdrs[i].value, strlen(ra->resp_hdrs[i].value)) != ESP_OK) {
return ESP_ERR_HTTPD_RESP_SEND;
}
/* Send CR + LF */
if (httpd_send_all(r, cr_lf_seperator, strlen(cr_lf_seperator)) != ESP_OK) {
return ESP_ERR_HTTPD_RESP_SEND;
}
}
/* End header section */
if (httpd_send_all(r, cr_lf_seperator, strlen(cr_lf_seperator)) != ESP_OK) {
return ESP_ERR_HTTPD_RESP_SEND;
}
ra->first_chunk_sent = true;
}
/* Sending chunked content */
char len_str[10];
snprintf(len_str, sizeof(len_str), "%x\r\n", buf_len);
if (httpd_send_all(r, len_str, strlen(len_str)) != ESP_OK) {
return ESP_ERR_HTTPD_RESP_SEND;
}
if (buf) {
if (httpd_send_all(r, buf, (size_t) buf_len) != ESP_OK) {
return ESP_ERR_HTTPD_RESP_SEND;
}
}
/* Indicate end of chunk */
if (httpd_send_all(r, "\r\n", strlen("\r\n")) != ESP_OK) {
return ESP_ERR_HTTPD_RESP_SEND;
}
return ESP_OK;
}
esp_err_t httpd_resp_send_err(httpd_req_t *req, httpd_err_code_t error, const char *usr_msg)
{
esp_err_t ret;
const char *msg;
const char *status;
switch (error) {
case HTTPD_501_METHOD_NOT_IMPLEMENTED:
status = "501 Method Not Implemented";
msg = "Request method is not supported by server";
break;
case HTTPD_505_VERSION_NOT_SUPPORTED:
status = "505 Version Not Supported";
msg = "HTTP version not supported by server";
break;
case HTTPD_400_BAD_REQUEST:
status = "400 Bad Request";
msg = "Server unable to understand request due to invalid syntax";
break;
case HTTPD_401_UNAUTHORIZED:
status = "401 Unauthorized";
msg = "Server known the client's identify and it must authenticate itself to get he requested response";
break;
case HTTPD_403_FORBIDDEN:
status = "403 Forbidden";
msg = "Server is refusing to give the requested resource to the client";
break;
case HTTPD_404_NOT_FOUND:
status = "404 Not Found";
msg = "This URI does not exist";
break;
case HTTPD_405_METHOD_NOT_ALLOWED:
status = "405 Method Not Allowed";
msg = "Request method for this URI is not handled by server";
break;
case HTTPD_408_REQ_TIMEOUT:
status = "408 Request Timeout";
msg = "Server closed this connection";
break;
case HTTPD_414_URI_TOO_LONG:
status = "414 URI Too Long";
msg = "URI is too long for server to interpret";
break;
case HTTPD_411_LENGTH_REQUIRED:
status = "411 Length Required";
msg = "Chunked encoding not supported by server";
break;
case HTTPD_431_REQ_HDR_FIELDS_TOO_LARGE:
status = "431 Request Header Fields Too Large";
msg = "Header fields are too long for server to interpret";
break;
case HTTPD_500_INTERNAL_SERVER_ERROR:
default:
status = "500 Internal Server Error";
msg = "Server has encountered an unexpected error";
}
/* If user has provided custom message, override default message */
msg = usr_msg ? usr_msg : msg;
ESP_LOGW(TAG, LOG_FMT("%s - %s"), status, msg);
/* Set error code in HTTP response */
httpd_resp_set_status(req, status);
httpd_resp_set_type(req, HTTPD_TYPE_TEXT);
#ifdef CONFIG_HTTPD_ERR_RESP_NO_DELAY
/* Use TCP_NODELAY option to force socket to send data in buffer
* This ensures that the error message is sent before the socket
* is closed */
struct httpd_req_aux *ra = req->aux;
int nodelay = 1;
if (setsockopt(ra->sd->fd, IPPROTO_TCP, TCP_NODELAY, &nodelay, sizeof(nodelay)) < 0) {
/* If failed to turn on TCP_NODELAY, throw warning and continue */
ESP_LOGW(TAG, LOG_FMT("error calling setsockopt : %d"), errno);
nodelay = 0;
}
#endif
/* Send HTTP error message */
ret = httpd_resp_send(req, msg, HTTPD_RESP_USE_STRLEN);
#ifdef CONFIG_HTTPD_ERR_RESP_NO_DELAY
/* If TCP_NODELAY was set successfully above, time to disable it */
if (nodelay == 1) {
nodelay = 0;
if (setsockopt(ra->sd->fd, IPPROTO_TCP, TCP_NODELAY, &nodelay, sizeof(nodelay)) < 0) {
/* If failed to turn off TCP_NODELAY, throw error and
* return failure to signal for socket closure */
ESP_LOGE(TAG, LOG_FMT("error calling setsockopt : %d"), errno);
return ESP_ERR_INVALID_STATE;
}
}
#endif
return ret;
}
esp_err_t httpd_register_err_handler(httpd_handle_t handle,
httpd_err_code_t error,
httpd_err_handler_func_t err_handler_fn)
{
if (handle == NULL || error >= HTTPD_ERR_CODE_MAX) {
return ESP_ERR_INVALID_ARG;
}
struct httpd_data *hd = (struct httpd_data *) handle;
hd->err_handler_fns[error] = err_handler_fn;
return ESP_OK;
}
esp_err_t httpd_req_handle_err(httpd_req_t *req, httpd_err_code_t error)
{
struct httpd_data *hd = (struct httpd_data *) req->handle;
esp_err_t ret;
/* Invoke custom error handler if configured */
if (hd->err_handler_fns[error]) {
ret = hd->err_handler_fns[error](req, error);
/* If error code is 500, force return failure
* irrespective of the handler's return value */
ret = (error == HTTPD_500_INTERNAL_SERVER_ERROR ? ESP_FAIL : ret);
} else {
/* If no handler is registered for this error default
* behavior is to send the HTTP error response and
* return failure for closure of underlying socket */
httpd_resp_send_err(req, error, NULL);
ret = ESP_FAIL;
}
return ret;
}
int httpd_req_recv(httpd_req_t *r, char *buf, size_t buf_len)
{
if (r == NULL || buf == NULL) {
return HTTPD_SOCK_ERR_INVALID;
}
if (!httpd_valid_req(r)) {
ESP_LOGW(TAG, LOG_FMT("invalid request"));
return HTTPD_SOCK_ERR_INVALID;
}
struct httpd_req_aux *ra = r->aux;
ESP_LOGD(TAG, LOG_FMT("remaining length = %d"), ra->remaining_len);
if (buf_len > ra->remaining_len) {
buf_len = ra->remaining_len;
}
if (buf_len == 0) {
return buf_len;
}
int ret = httpd_recv(r, buf, buf_len);
if (ret < 0) {
ESP_LOGD(TAG, LOG_FMT("error in httpd_recv"));
return ret;
}
ra->remaining_len -= ret;
ESP_LOGD(TAG, LOG_FMT("received length = %d"), ret);
return ret;
}
int httpd_req_to_sockfd(httpd_req_t *r)
{
if (r == NULL) {
return -1;
}
if (!httpd_valid_req(r)) {
ESP_LOGW(TAG, LOG_FMT("invalid request"));
return -1;
}
struct httpd_req_aux *ra = r->aux;
return ra->sd->fd;
}
static int httpd_sock_err(const char *ctx, int sockfd)
{
int errval;
ESP_LOGW(TAG, LOG_FMT("error in %s : %d"), ctx, errno);
switch(errno) {
case EAGAIN:
case EINTR:
errval = HTTPD_SOCK_ERR_TIMEOUT;
break;
case EINVAL:
case EBADF:
case EFAULT:
case ENOTSOCK:
errval = HTTPD_SOCK_ERR_INVALID;
break;
default:
errval = HTTPD_SOCK_ERR_FAIL;
}
return errval;
}
int httpd_default_send(httpd_handle_t hd, int sockfd, const char *buf, size_t buf_len, int flags)
{
(void)hd;
if (buf == NULL) {
return HTTPD_SOCK_ERR_INVALID;
}
int ret = send(sockfd, buf, buf_len, flags);
if (ret < 0) {
return httpd_sock_err("send", sockfd);
}
return ret;
}
int httpd_default_recv(httpd_handle_t hd, int sockfd, char *buf, size_t buf_len, int flags)
{
(void)hd;
if (buf == NULL) {
return HTTPD_SOCK_ERR_INVALID;
}
int ret = recv(sockfd, buf, buf_len, flags);
if (ret < 0) {
return httpd_sock_err("recv", sockfd);
}
return ret;
}
int httpd_socket_send(httpd_handle_t hd, int sockfd, const char *buf, size_t buf_len, int flags)
{
struct sock_db *sess = httpd_sess_get(hd, sockfd);
if (!sess) {
return ESP_ERR_INVALID_ARG;
}
if (!sess->send_fn) {
return ESP_ERR_INVALID_STATE;
}
return sess->send_fn(hd, sockfd, buf, buf_len, flags);
}
int httpd_socket_recv(httpd_handle_t hd, int sockfd, char *buf, size_t buf_len, int flags)
{
struct sock_db *sess = httpd_sess_get(hd, sockfd);
if (!sess) {
return ESP_ERR_INVALID_ARG;
}
if (!sess->recv_fn) {
return ESP_ERR_INVALID_STATE;
}
return sess->recv_fn(hd, sockfd, buf, buf_len, flags);
}
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