2 * Copyright (C) 2016-2019 "IoT.bzh"
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 * This work is a far adaptation of apache-websocket:
19 * origin: https://github.com/disconnect/apache-websocket
20 * commit: cfaef071223f11ba016bff7e1e4b7c9e5df45b50
21 * Copyright 2010-2012 self.disconnect (APACHE-2)
32 #if !defined(WEBSOCKET_DEFAULT_MAXLENGTH)
33 # define WEBSOCKET_DEFAULT_MAXLENGTH 1048500 /* 76 less than 1M, probably enougth for headers */
36 #define FRAME_GET_FIN(BYTE) (((BYTE) >> 7) & 0x01)
37 #define FRAME_GET_RSV1(BYTE) (((BYTE) >> 6) & 0x01)
38 #define FRAME_GET_RSV2(BYTE) (((BYTE) >> 5) & 0x01)
39 #define FRAME_GET_RSV3(BYTE) (((BYTE) >> 4) & 0x01)
40 #define FRAME_GET_OPCODE(BYTE) ( (BYTE) & 0x0F)
41 #define FRAME_GET_MASK(BYTE) (((BYTE) >> 7) & 0x01)
42 #define FRAME_GET_PAYLOAD_LEN(BYTE) ( (BYTE) & 0x7F)
44 #define FRAME_SET_FIN(BYTE) (((BYTE) & 0x01) << 7)
45 #define FRAME_SET_RSV1(BYTE) (((BYTE) & 0x01) << 6)
46 #define FRAME_SET_RSV2(BYTE) (((BYTE) & 0x01) << 5)
47 #define FRAME_SET_RSV3(BYTE) (((BYTE) & 0x01) << 4)
48 #define FRAME_SET_OPCODE(BYTE) ((BYTE) & 0x0F)
49 #define FRAME_SET_MASK(BYTE) (((BYTE) & 0x01) << 7)
50 #define FRAME_SET_LENGTH(X64, IDX) (unsigned char)((sizeof(X64)) <= (IDX) ? 0 : (((X64) >> ((IDX)*8)) & 0xFF))
52 #define OPCODE_CONTINUATION 0x0
53 #define OPCODE_TEXT 0x1
54 #define OPCODE_BINARY 0x2
55 #define OPCODE_CLOSE 0x8
56 #define OPCODE_PING 0x9
57 #define OPCODE_PONG 0xA
61 #define STATE_LENGTH 2
64 static size_t default_maxlength = WEBSOCKET_DEFAULT_MAXLENGTH;
72 unsigned char header[14]; /* 2 + 8 + 4 */
73 const struct websock_itf *itf;
77 static ssize_t ws_writev(struct websock *ws, const struct iovec *iov, int iovcnt)
79 return ws->itf->writev(ws->closure, iov, iovcnt);
82 static ssize_t ws_readv(struct websock *ws, const struct iovec *iov, int iovcnt)
84 return ws->itf->readv(ws->closure, iov, iovcnt);
87 static ssize_t ws_read(struct websock *ws, void *buffer, size_t buffer_size)
90 iov.iov_base = buffer;
91 iov.iov_len = buffer_size;
92 return ws_readv(ws, &iov, 1);
95 static int websock_send_internal_v(struct websock *ws, unsigned char first, const struct iovec *iovec, int count)
99 size_t pos, size, len;
101 unsigned char header[32];
104 if (count < 0 || (count + 1) > (int)(sizeof iov / sizeof * iov)) {
109 /* computes the size */
112 for (j = 0 ; j < count ; j++) {
113 iov[i].iov_base = iovec[j].iov_base;
114 len = iovec[j].iov_len;
116 iov[i].iov_len = len;
122 /* makes the header */
124 header[pos++] = first;
125 size = (uint64_t) size;
127 header[pos++] = FRAME_SET_MASK(0) | FRAME_SET_LENGTH(size, 0);
130 header[pos++] = FRAME_SET_MASK(0) | 126;
132 header[pos++] = FRAME_SET_MASK(0) | 127;
133 header[pos++] = FRAME_SET_LENGTH(size, 7);
134 header[pos++] = FRAME_SET_LENGTH(size, 6);
135 header[pos++] = FRAME_SET_LENGTH(size, 5);
136 header[pos++] = FRAME_SET_LENGTH(size, 4);
137 header[pos++] = FRAME_SET_LENGTH(size, 3);
138 header[pos++] = FRAME_SET_LENGTH(size, 2);
140 header[pos++] = FRAME_SET_LENGTH(size, 1);
141 header[pos++] = FRAME_SET_LENGTH(size, 0);
144 /* allocates the vec */
145 iov[0].iov_base = header;
146 iov[0].iov_len = pos;
147 rc = ws_writev(ws, iov, i);
149 return rc < 0 ? -1 : 0;
152 static int websock_send_internal(struct websock *ws, unsigned char first, const void *buffer, size_t size)
156 iov.iov_base = (void *)buffer;
158 return websock_send_internal_v(ws, first, &iov, 1);
161 static inline int websock_send_v(struct websock *ws, int last, int rsv1, int rsv2, int rsv3, int opcode, const struct iovec *iovec, int count)
163 unsigned char first = (unsigned char)(FRAME_SET_FIN(last)
164 | FRAME_SET_RSV1(rsv1)
165 | FRAME_SET_RSV1(rsv2)
166 | FRAME_SET_RSV1(rsv3)
167 | FRAME_SET_OPCODE(opcode));
168 return websock_send_internal_v(ws, first, iovec, count);
171 static inline int websock_send(struct websock *ws, int last, int rsv1, int rsv2, int rsv3, int opcode, const void *buffer, size_t size)
173 unsigned char first = (unsigned char)(FRAME_SET_FIN(last)
174 | FRAME_SET_RSV1(rsv1)
175 | FRAME_SET_RSV1(rsv2)
176 | FRAME_SET_RSV1(rsv3)
177 | FRAME_SET_OPCODE(opcode));
178 return websock_send_internal(ws, first, buffer, size);
181 int websock_close_empty(struct websock *ws)
183 return websock_close(ws, WEBSOCKET_CODE_NOT_SET, NULL, 0);
186 int websock_close(struct websock *ws, uint16_t code, const void *data, size_t length)
188 unsigned char buffer[2];
191 if (code == WEBSOCKET_CODE_NOT_SET && length == 0)
192 return websock_send(ws, 1, 0, 0, 0, OPCODE_CLOSE, NULL, 0);
194 /* checks the length */
200 /* prepare the buffer */
201 buffer[0] = (unsigned char)((code >> 8) & 0xFF);
202 buffer[1] = (unsigned char)(code & 0xFF);
204 /* Send server-side closing handshake */
205 iov[0].iov_base = (void *)buffer;
207 iov[1].iov_base = (void *)data;
208 iov[1].iov_len = length;
209 return websock_send_v(ws, 1, 0, 0, 0, OPCODE_CLOSE, iov, 2);
212 int websock_ping(struct websock *ws, const void *data, size_t length)
214 /* checks the length */
220 return websock_send(ws, 1, 0, 0, 0, OPCODE_PING, data, length);
223 int websock_pong(struct websock *ws, const void *data, size_t length)
225 /* checks the length */
231 return websock_send(ws, 1, 0, 0, 0, OPCODE_PONG, data, length);
234 int websock_text(struct websock *ws, int last, const void *text, size_t length)
236 return websock_send(ws, last, 0, 0, 0, OPCODE_TEXT, text, length);
239 int websock_text_v(struct websock *ws, int last, const struct iovec *iovec, int count)
241 return websock_send_v(ws, last, 0, 0, 0, OPCODE_TEXT, iovec, count);
244 int websock_binary(struct websock *ws, int last, const void *data, size_t length)
246 return websock_send(ws, last, 0, 0, 0, OPCODE_BINARY, data, length);
249 int websock_binary_v(struct websock *ws, int last, const struct iovec *iovec, int count)
251 return websock_send_v(ws, last, 0, 0, 0, OPCODE_BINARY, iovec, count);
254 int websock_continue(struct websock *ws, int last, const void *data, size_t length)
256 return websock_send(ws, last, 0, 0, 0, OPCODE_CONTINUATION, data, length);
259 int websock_continue_v(struct websock *ws, int last, const struct iovec *iovec, int count)
261 return websock_send_v(ws, last, 0, 0, 0, OPCODE_CONTINUATION, iovec, count);
264 int websock_error(struct websock *ws, uint16_t code, const void *data, size_t size)
266 int rc = websock_close(ws, code, data, size);
267 if (ws->itf->on_error != NULL)
268 ws->itf->on_error(ws->closure, code, data, size);
272 static int read_header(struct websock *ws)
274 if (ws->lenhead < ws->szhead) {
276 ws_read(ws, &ws->header[ws->lenhead], (size_t)(ws->szhead - ws->lenhead));
279 ws->lenhead += (int)rbc;
284 static int check_control_header(struct websock *ws)
287 if (FRAME_GET_RSV1(ws->header[0]) != 0)
289 if (FRAME_GET_RSV2(ws->header[0]) != 0)
291 if (FRAME_GET_RSV3(ws->header[0]) != 0)
293 if (FRAME_GET_PAYLOAD_LEN(ws->header[1]) > 125)
295 if (FRAME_GET_OPCODE(ws->header[0]) == OPCODE_CLOSE)
296 return FRAME_GET_PAYLOAD_LEN(ws->header[1]) != 1;
300 int websock_dispatch(struct websock *ws, int loop)
308 ws->state = STATE_START;
312 /* read the header */
315 else if (ws->lenhead < ws->szhead)
318 switch (FRAME_GET_OPCODE(ws->header[0])) {
319 case OPCODE_CONTINUATION:
324 if (!check_control_header(ws))
326 if (FRAME_GET_PAYLOAD_LEN(ws->header[1]))
331 if (!check_control_header(ws))
336 /* update heading size */
337 switch (FRAME_GET_PAYLOAD_LEN(ws->header[1])) {
345 ws->szhead += 4 * FRAME_GET_MASK(ws->header[1]);
347 ws->state = STATE_LENGTH;
351 /* continue to read the header */
354 else if (ws->lenhead < ws->szhead)
358 switch (FRAME_GET_PAYLOAD_LEN(ws->header[1])) {
360 ws->length = (((uint64_t) ws->header[2]) << 56)
361 | (((uint64_t) ws->header[3]) << 48)
362 | (((uint64_t) ws->header[4]) << 40)
363 | (((uint64_t) ws->header[5]) << 32)
364 | (((uint64_t) ws->header[6]) << 24)
365 | (((uint64_t) ws->header[7]) << 16)
366 | (((uint64_t) ws->header[8]) << 8)
367 | (uint64_t) ws->header[9];
370 ws->length = (((uint64_t) ws->header[2]) << 8)
371 | (uint64_t) ws->header[3];
374 ws->length = FRAME_GET_PAYLOAD_LEN(ws->header[1]);
377 if (FRAME_GET_OPCODE(ws->header[0]) == OPCODE_CLOSE && ws->length != 0)
379 if (ws->length > ws->maxlength)
383 if (FRAME_GET_MASK(ws->header[1])) {
384 ((unsigned char *)&ws->mask)[0] = ws->header[ws->szhead - 4];
385 ((unsigned char *)&ws->mask)[1] = ws->header[ws->szhead - 3];
386 ((unsigned char *)&ws->mask)[2] = ws->header[ws->szhead - 2];
387 ((unsigned char *)&ws->mask)[3] = ws->header[ws->szhead - 1];
391 /* all heading fields are known, process */
392 ws->state = STATE_DATA;
393 if (ws->itf->on_extension != NULL) {
394 if (ws->itf->on_extension(ws->closure,
395 FRAME_GET_FIN(ws->header[0]),
396 FRAME_GET_RSV1(ws->header[0]),
397 FRAME_GET_RSV2(ws->header[0]),
398 FRAME_GET_RSV3(ws->header[0]),
399 FRAME_GET_OPCODE(ws->header[0]),
400 (size_t) ws->length)) {
405 /* not an extension case */
406 if (FRAME_GET_RSV1(ws->header[0]) != 0)
408 if (FRAME_GET_RSV2(ws->header[0]) != 0)
410 if (FRAME_GET_RSV3(ws->header[0]) != 0)
414 switch (FRAME_GET_OPCODE(ws->header[0])) {
415 case OPCODE_CONTINUATION:
416 ws->itf->on_continue(ws->closure,
417 FRAME_GET_FIN(ws->header[0]),
418 (size_t) ws->length);
423 ws->itf->on_text(ws->closure,
424 FRAME_GET_FIN(ws->header[0]),
425 (size_t) ws->length);
430 ws->itf->on_binary(ws->closure,
431 FRAME_GET_FIN(ws->header[0]),
432 (size_t) ws->length);
438 code = WEBSOCKET_CODE_NOT_SET;
440 code = (uint16_t)(ws->header[ws->szhead - 2] & 0xff);
441 code = (uint16_t)(code << 8);
442 code = (uint16_t)(code | (uint16_t)(ws->header[ws->szhead - 1] & 0xff));
444 ws->itf->on_close(ws->closure, code, (size_t) ws->length);
447 if (ws->itf->on_ping)
448 ws->itf->on_ping(ws->closure, ws->length);
451 websock_pong(ws, NULL, 0);
453 ws->state = STATE_INIT;
458 if (ws->itf->on_pong)
459 ws->itf->on_pong(ws->closure, ws->length);
462 ws->state = STATE_INIT;
474 ws->state = STATE_INIT;
480 websock_error(ws, WEBSOCKET_CODE_MESSAGE_TOO_LARGE, NULL, 0);
484 websock_error(ws, WEBSOCKET_CODE_PROTOCOL_ERROR, NULL, 0);
488 static void unmask(struct websock * ws, void *buffer, size_t size)
495 while (size && ((sizeof(uint32_t) - 1) & (uintptr_t) b8)) {
496 m = ((uint8_t *) & mask)[0];
497 ((uint8_t *) & mask)[0] = ((uint8_t *) & mask)[1];
498 ((uint8_t *) & mask)[1] = ((uint8_t *) & mask)[2];
499 ((uint8_t *) & mask)[2] = ((uint8_t *) & mask)[3];
500 ((uint8_t *) & mask)[3] = m;
504 b32 = (uint32_t *) b8;
505 while (size >= sizeof(uint32_t)) {
507 size -= sizeof(uint32_t);
509 b8 = (uint8_t *) b32;
511 m = ((uint8_t *) & mask)[0];
512 ((uint8_t *) & mask)[0] = ((uint8_t *) & mask)[1];
513 ((uint8_t *) & mask)[1] = ((uint8_t *) & mask)[2];
514 ((uint8_t *) & mask)[2] = ((uint8_t *) & mask)[3];
515 ((uint8_t *) & mask)[3] = m;
522 ssize_t websock_read(struct websock * ws, void *buffer, size_t size)
526 if (ws->state != STATE_DATA)
529 if (size > ws->length)
530 size = (size_t) ws->length;
532 rc = ws_read(ws, buffer, size);
538 unmask(ws, buffer, size);
543 int websock_drop(struct websock *ws)
548 if (websock_read(ws, buffer, sizeof buffer) < 0)
553 struct websock *websock_create_v13(const struct websock_itf *itf, void *closure)
555 struct websock *result = calloc(1, sizeof *result);
558 result->closure = closure;
559 result->maxlength = default_maxlength;
564 void websock_destroy(struct websock *ws)
569 void websock_set_default_max_length(size_t maxlen)
571 default_maxlength = maxlen;
574 void websock_set_max_length(struct websock *ws, size_t maxlen)
576 ws->maxlength = (uint64_t)maxlen;
579 const char *websocket_explain_error(uint16_t code)
581 static const char *msgs[] = {
583 "GOING_AWAY", /* 1001 */
584 "PROTOCOL_ERROR", /* 1002 */
585 "CANT_ACCEPT", /* 1003 */
586 "RESERVED", /* 1004 */
587 "NOT_SET", /* 1005 */
588 "ABNORMAL", /* 1006 */
589 "INVALID_UTF8", /* 1007 */
590 "POLICY_VIOLATION", /* 1008 */
591 "MESSAGE_TOO_LARGE", /* 1009 */
592 "EXPECT_EXTENSION", /* 1010 */
593 "INTERNAL_ERROR", /* 1011 */
595 if (code < 1000 || (code - 1000) >= (sizeof msgs / sizeof *msgs))
597 return msgs[code - 1000];