Outline ![]()
Files ![]()
loading...
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
/*
* SPDX-FileCopyrightText: 2018-2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <errno.h>
#include <esp_log.h>
#include <esp_err.h>
#include <http_parser.h>
#include <esp_http_server.h>
#include "esp_httpd_priv.h"
static const char *TAG = "httpd_uri";
static bool httpd_uri_match_simple(const char *uri1, const char *uri2, size_t len2)
{
return strlen(uri1) == len2 && // First match lengths
(strncmp(uri1, uri2, len2) == 0); // Then match actual URIs
}
bool httpd_uri_match_wildcard(const char *template, const char *uri, size_t len)
{
const size_t tpl_len = strlen(template);
size_t exact_match_chars = tpl_len;
/* Check for trailing question mark and asterisk */
const char last = (const char) (tpl_len > 0 ? template[tpl_len - 1] : 0);
const char prevlast = (const char) (tpl_len > 1 ? template[tpl_len - 2] : 0);
const bool asterisk = last == '*' || (prevlast == '*' && last == '?');
const bool quest = last == '?' || (prevlast == '?' && last == '*');
/* Minimum template string length must be:
* 0 : if neither of '*' and '?' are present
* 1 : if only '*' is present
* 2 : if only '?' is present
* 3 : if both are present
*
* The expression (asterisk + quest*2) serves as a
* case wise generator of these length values
*/
/* abort in cases such as "?" with no preceding character (invalid template) */
if (exact_match_chars < asterisk + quest*2) {
return false;
}
/* account for special characters and the optional character if "?" is used */
exact_match_chars -= asterisk + quest*2;
if (len < exact_match_chars) {
return false;
}
if (!quest) {
if (!asterisk && len != exact_match_chars) {
/* no special characters and different length - strncmp would return false */
return false;
}
/* asterisk allows arbitrary trailing characters, we ignore these using
* exact_match_chars as the length limit */
return (strncmp(template, uri, exact_match_chars) == 0);
} else {
/* question mark present */
if (len > exact_match_chars && template[exact_match_chars] != uri[exact_match_chars]) {
/* the optional character is present, but different */
return false;
}
if (strncmp(template, uri, exact_match_chars) != 0) {
/* the mandatory part differs */
return false;
}
/* Now we know the URI is longer than the required part of template,
* the mandatory part matches, and if the optional character is present, it is correct.
* Match is OK if we have asterisk, i.e. any trailing characters are OK, or if
* there are no characters beyond the optional character. */
return asterisk || len <= exact_match_chars + 1;
}
}
/* Find handler with matching URI and method, and set
* appropriate error code if URI or method not found */
static httpd_uri_t* httpd_find_uri_handler(struct httpd_data *hd,
const char *uri, size_t uri_len,
httpd_method_t method,
httpd_err_code_t *err)
{
if (err) {
*err = HTTPD_404_NOT_FOUND;
}
for (int i = 0; i < hd->config.max_uri_handlers; i++) {
if (!hd->hd_calls[i]) {
break;
}
ESP_LOGD(TAG, LOG_FMT("[%d] = %s"), i, hd->hd_calls[i]->uri);
/* Check if custom URI matching function is set,
* else use simple string compare */
if (hd->config.uri_match_fn ?
hd->config.uri_match_fn(hd->hd_calls[i]->uri, uri, uri_len) :
httpd_uri_match_simple(hd->hd_calls[i]->uri, uri, uri_len)) {
/* URIs match. Now check if method is supported */
if (hd->hd_calls[i]->method == method || hd->hd_calls[i]->method == HTTP_ANY) {
/* Match found! */
if (err) {
/* Unset any error that may
* have been set earlier */
*err = 0;
}
return hd->hd_calls[i];
}
/* URI found but method not allowed.
* If URI is found later then this
* error must be set to 0 */
if (err) {
*err = HTTPD_405_METHOD_NOT_ALLOWED;
}
}
}
return NULL;
}
esp_err_t httpd_register_uri_handler(httpd_handle_t handle,
const httpd_uri_t *uri_handler)
{
if (handle == NULL || uri_handler == NULL) {
return ESP_ERR_INVALID_ARG;
}
struct httpd_data *hd = (struct httpd_data *) handle;
/* Make sure another handler with matching URI and method
* is not already registered. This will also catch cases
* when a registered URI wildcard pattern already accounts
* for the new URI being registered */
if (httpd_find_uri_handler(handle, uri_handler->uri,
strlen(uri_handler->uri),
uri_handler->method, NULL) != NULL) {
ESP_LOGW(TAG, LOG_FMT("handler %s with method %d already registered"),
uri_handler->uri, uri_handler->method);
return ESP_ERR_HTTPD_HANDLER_EXISTS;
}
for (int i = 0; i < hd->config.max_uri_handlers; i++) {
if (hd->hd_calls[i] == NULL) {
ESP_COMPILER_DIAGNOSTIC_PUSH_IGNORE("-Wanalyzer-malloc-leak") // False-positive detection. TODO GCC-366
hd->hd_calls[i] = malloc(sizeof(httpd_uri_t));
if (hd->hd_calls[i] == NULL) {
/* Failed to allocate memory */
return ESP_ERR_HTTPD_ALLOC_MEM;
}
ESP_COMPILER_DIAGNOSTIC_POP("-Wanalyzer-malloc-leak")
/* Copy URI string */
hd->hd_calls[i]->uri = strdup(uri_handler->uri);
if (hd->hd_calls[i]->uri == NULL) {
/* Failed to allocate memory */
free(hd->hd_calls[i]);
return ESP_ERR_HTTPD_ALLOC_MEM;
}
/* Copy remaining members */
hd->hd_calls[i]->method = uri_handler->method;
hd->hd_calls[i]->handler = uri_handler->handler;
hd->hd_calls[i]->user_ctx = uri_handler->user_ctx;
#ifdef CONFIG_HTTPD_WS_SUPPORT
hd->hd_calls[i]->is_websocket = uri_handler->is_websocket;
hd->hd_calls[i]->handle_ws_control_frames = uri_handler->handle_ws_control_frames;
if (uri_handler->supported_subprotocol) {
hd->hd_calls[i]->supported_subprotocol = strdup(uri_handler->supported_subprotocol);
} else {
hd->hd_calls[i]->supported_subprotocol = NULL;
}
#endif
ESP_LOGD(TAG, LOG_FMT("[%d] installed %s"), i, uri_handler->uri);
return ESP_OK;
}
ESP_LOGD(TAG, LOG_FMT("[%d] exists %s"), i, hd->hd_calls[i]->uri);
}
ESP_LOGW(TAG, LOG_FMT("no slots left for registering handler"));
return ESP_ERR_HTTPD_HANDLERS_FULL;
}
esp_err_t httpd_unregister_uri_handler(httpd_handle_t handle,
const char *uri, httpd_method_t method)
{
if (handle == NULL || uri == NULL) {
return ESP_ERR_INVALID_ARG;
}
struct httpd_data *hd = (struct httpd_data *) handle;
for (int i = 0; i < hd->config.max_uri_handlers; i++) {
if (!hd->hd_calls[i]) {
break;
}
if ((hd->hd_calls[i]->method == method) && // First match methods
(strcmp(hd->hd_calls[i]->uri, uri) == 0)) { // Then match URI string
ESP_LOGD(TAG, LOG_FMT("[%d] removing %s"), i, hd->hd_calls[i]->uri);
free((char*)hd->hd_calls[i]->uri);
free(hd->hd_calls[i]);
hd->hd_calls[i] = NULL;
/* Shift the remaining non null handlers in the array
* forward by 1 so that order of insertion is maintained */
for (i += 1; i < hd->config.max_uri_handlers; i++) {
if (!hd->hd_calls[i]) {
break;
}
hd->hd_calls[i-1] = hd->hd_calls[i];
}
/* Nullify the following non null entry */
hd->hd_calls[i-1] = NULL;
return ESP_OK;
}
}
ESP_LOGW(TAG, LOG_FMT("handler %s with method %d not found"), uri, method);
return ESP_ERR_NOT_FOUND;
}
esp_err_t httpd_unregister_uri(httpd_handle_t handle, const char *uri)
{
if (handle == NULL || uri == NULL) {
return ESP_ERR_INVALID_ARG;
}
struct httpd_data *hd = (struct httpd_data *) handle;
bool found = false;
int i = 0, j = 0; // For keeping count of removed entries
for (; i < hd->config.max_uri_handlers; i++) {
if (!hd->hd_calls[i]) {
break;
}
if (strcmp(hd->hd_calls[i]->uri, uri) == 0) { // Match URI strings
ESP_LOGD(TAG, LOG_FMT("[%d] removing %s"), i, uri);
free((char*)hd->hd_calls[i]->uri);
free(hd->hd_calls[i]);
hd->hd_calls[i] = NULL;
found = true;
j++; // Update count of removed entries
} else {
/* Shift the remaining non null handlers in the array
* forward by j so that order of insertion is maintained */
hd->hd_calls[i-j] = hd->hd_calls[i];
}
}
/* Nullify the following non null entries */
for (int k = (i - j); k < i; k++) {
hd->hd_calls[k] = NULL;
}
if (!found) {
ESP_LOGW(TAG, LOG_FMT("no handler found for URI %s"), uri);
}
return (found ? ESP_OK : ESP_ERR_NOT_FOUND);
}
void httpd_unregister_all_uri_handlers(struct httpd_data *hd)
{
for (unsigned i = 0; i < hd->config.max_uri_handlers; i++) {
if (!hd->hd_calls[i]) {
break;
}
ESP_LOGD(TAG, LOG_FMT("[%d] removing %s"), i, hd->hd_calls[i]->uri);
free((char*)hd->hd_calls[i]->uri);
free(hd->hd_calls[i]);
hd->hd_calls[i] = NULL;
}
}
esp_err_t httpd_uri(struct httpd_data *hd)
{
httpd_uri_t *uri = NULL;
httpd_req_t *req = &hd->hd_req;
struct http_parser_url *res = &hd->hd_req_aux.url_parse_res;
/* For conveying URI not found/method not allowed */
httpd_err_code_t err = 0;
ESP_LOGD(TAG, LOG_FMT("request for %s with type %d"), req->uri, req->method);
/* URL parser result contains offset and length of path string */
if (res->field_set & (1 << UF_PATH)) {
uri = httpd_find_uri_handler(hd, req->uri + res->field_data[UF_PATH].off,
res->field_data[UF_PATH].len, req->method, &err);
}
/* If URI with method not found, respond with error code */
if (uri == NULL) {
switch (err) {
case HTTPD_404_NOT_FOUND:
ESP_LOGW(TAG, LOG_FMT("URI '%s' not found"), req->uri);
return httpd_req_handle_err(req, HTTPD_404_NOT_FOUND);
case HTTPD_405_METHOD_NOT_ALLOWED:
ESP_LOGW(TAG, LOG_FMT("Method '%d' not allowed for URI '%s'"),
req->method, req->uri);
return httpd_req_handle_err(req, HTTPD_405_METHOD_NOT_ALLOWED);
default:
return ESP_FAIL;
}
}
/* Attach user context data (passed during URI registration) into request */
req->user_ctx = uri->user_ctx;
/* Final step for a WebSocket handshake verification */
#ifdef CONFIG_HTTPD_WS_SUPPORT
struct httpd_req_aux *aux = req->aux;
if (uri->is_websocket && aux->ws_handshake_detect && uri->method == HTTP_GET) {
ESP_LOGD(TAG, LOG_FMT("Responding WS handshake to sock %d"), aux->sd->fd);
esp_err_t ret = httpd_ws_respond_server_handshake(&hd->hd_req, uri->supported_subprotocol);
if (ret != ESP_OK) {
return ret;
}
aux->sd->ws_handshake_done = true;
aux->sd->ws_handler = uri->handler;
aux->sd->ws_control_frames = uri->handle_ws_control_frames;
aux->sd->ws_user_ctx = uri->user_ctx;
}
#endif
/* Invoke handler */
if (uri->handler(req) != ESP_OK) {
/* Handler returns error, this socket should be closed */
ESP_LOGW(TAG, LOG_FMT("uri handler execution failed"));
return ESP_FAIL;
}
return ESP_OK;
}
Details ![]()
Show: from Types: Columns: ![]( "Show Project Names")
![]( "Show Locations")
![]( "Show Referring Symbols")
![]( "Show Scope")
This file uses the notable symbols shown below. Click anywhere in the file to view more details.