2 * Copyright (C) 2016, 2017 "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 #define BLOCK_DATA_SIZE 4096
33 #if !defined(WEBSOCKET_DEFAULT_MAXLENGTH)
34 # define WEBSOCKET_DEFAULT_MAXLENGTH 1048500 /* 76 less than 1M, probably enougth for headers */
37 #define FRAME_GET_FIN(BYTE) (((BYTE) >> 7) & 0x01)
38 #define FRAME_GET_RSV1(BYTE) (((BYTE) >> 6) & 0x01)
39 #define FRAME_GET_RSV2(BYTE) (((BYTE) >> 5) & 0x01)
40 #define FRAME_GET_RSV3(BYTE) (((BYTE) >> 4) & 0x01)
41 #define FRAME_GET_OPCODE(BYTE) ( (BYTE) & 0x0F)
42 #define FRAME_GET_MASK(BYTE) (((BYTE) >> 7) & 0x01)
43 #define FRAME_GET_PAYLOAD_LEN(BYTE) ( (BYTE) & 0x7F)
45 #define FRAME_SET_FIN(BYTE) (((BYTE) & 0x01) << 7)
46 #define FRAME_SET_RSV1(BYTE) (((BYTE) & 0x01) << 6)
47 #define FRAME_SET_RSV2(BYTE) (((BYTE) & 0x01) << 5)
48 #define FRAME_SET_RSV3(BYTE) (((BYTE) & 0x01) << 4)
49 #define FRAME_SET_OPCODE(BYTE) ((BYTE) & 0x0F)
50 #define FRAME_SET_MASK(BYTE) (((BYTE) & 0x01) << 7)
51 #define FRAME_SET_LENGTH(X64, IDX) (unsigned char)((sizeof(X64)) <= (IDX) ? 0 : (((X64) >> ((IDX)*8)) & 0xFF))
53 #define OPCODE_CONTINUATION 0x0
54 #define OPCODE_TEXT 0x1
55 #define OPCODE_BINARY 0x2
56 #define OPCODE_CLOSE 0x8
57 #define OPCODE_PING 0x9
58 #define OPCODE_PONG 0xA
62 #define STATE_LENGTH 2
65 static size_t default_maxlength = WEBSOCKET_DEFAULT_MAXLENGTH;
73 unsigned char header[14]; /* 2 + 8 + 4 */
74 const struct websock_itf *itf;
78 static ssize_t ws_writev(struct websock *ws, const struct iovec *iov, int iovcnt)
80 return ws->itf->writev(ws->closure, iov, iovcnt);
83 static ssize_t ws_readv(struct websock *ws, const struct iovec *iov, int iovcnt)
85 return ws->itf->readv(ws->closure, iov, iovcnt);
89 static ssize_t ws_write(struct websock *ws, const void *buffer, size_t buffer_size)
92 iov.iov_base = (void *)buffer; /* const cast */
93 iov.iov_len = buffer_size;
94 return ws_writev(ws, &iov, 1);
98 static ssize_t ws_read(struct websock *ws, void *buffer, size_t buffer_size)
101 iov.iov_base = buffer;
102 iov.iov_len = buffer_size;
103 return ws_readv(ws, &iov, 1);
106 static int websock_send_internal_v(struct websock *ws, unsigned char first, const struct iovec *iovec, int count)
108 struct iovec iov[32];
110 size_t pos, size, len;
112 unsigned char header[32];
115 if (count < 0 || (count + 1) > (int)(sizeof iov / sizeof * iov)) {
120 /* computes the size */
123 for (j = 0 ; j < count ; j++) {
124 iov[i].iov_base = iovec[j].iov_base;
125 len = iovec[j].iov_len;
127 iov[i].iov_len = len;
133 /* makes the header */
135 header[pos++] = first;
136 size = (uint64_t) size;
138 header[pos++] = FRAME_SET_MASK(0) | FRAME_SET_LENGTH(size, 0);
141 header[pos++] = FRAME_SET_MASK(0) | 126;
143 header[pos++] = FRAME_SET_MASK(0) | 127;
144 header[pos++] = FRAME_SET_LENGTH(size, 7);
145 header[pos++] = FRAME_SET_LENGTH(size, 6);
146 header[pos++] = FRAME_SET_LENGTH(size, 5);
147 header[pos++] = FRAME_SET_LENGTH(size, 4);
148 header[pos++] = FRAME_SET_LENGTH(size, 3);
149 header[pos++] = FRAME_SET_LENGTH(size, 2);
151 header[pos++] = FRAME_SET_LENGTH(size, 1);
152 header[pos++] = FRAME_SET_LENGTH(size, 0);
155 /* allocates the vec */
156 iov[0].iov_base = header;
157 iov[0].iov_len = pos;
158 rc = ws_writev(ws, iov, i);
160 return rc < 0 ? -1 : 0;
163 static int websock_send_internal(struct websock *ws, unsigned char first, const void *buffer, size_t size)
167 iov.iov_base = (void *)buffer;
169 return websock_send_internal_v(ws, first, &iov, 1);
172 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)
174 unsigned char first = (unsigned char)(FRAME_SET_FIN(last)
175 | FRAME_SET_RSV1(rsv1)
176 | FRAME_SET_RSV1(rsv2)
177 | FRAME_SET_RSV1(rsv3)
178 | FRAME_SET_OPCODE(opcode));
179 return websock_send_internal_v(ws, first, iovec, count);
182 static inline int websock_send(struct websock *ws, int last, int rsv1, int rsv2, int rsv3, int opcode, const void *buffer, size_t size)
184 unsigned char first = (unsigned char)(FRAME_SET_FIN(last)
185 | FRAME_SET_RSV1(rsv1)
186 | FRAME_SET_RSV1(rsv2)
187 | FRAME_SET_RSV1(rsv3)
188 | FRAME_SET_OPCODE(opcode));
189 return websock_send_internal(ws, first, buffer, size);
192 int websock_close_empty(struct websock *ws)
194 return websock_close(ws, WEBSOCKET_CODE_NOT_SET, NULL, 0);
197 int websock_close(struct websock *ws, uint16_t code, const void *data, size_t length)
199 unsigned char buffer[2];
202 if (code == WEBSOCKET_CODE_NOT_SET && length == 0)
203 return websock_send(ws, 1, 0, 0, 0, OPCODE_CLOSE, NULL, 0);
205 /* checks the length */
211 /* prepare the buffer */
212 buffer[0] = (unsigned char)((code >> 8) & 0xFF);
213 buffer[1] = (unsigned char)(code & 0xFF);
215 /* Send server-side closing handshake */
216 iov[0].iov_base = (void *)buffer;
218 iov[1].iov_base = (void *)data;
219 iov[1].iov_len = length;
220 return websock_send_v(ws, 1, 0, 0, 0, OPCODE_CLOSE, iov, 2);
223 int websock_ping(struct websock *ws, const void *data, size_t length)
225 /* checks the length */
231 return websock_send(ws, 1, 0, 0, 0, OPCODE_PING, data, length);
234 int websock_pong(struct websock *ws, const void *data, size_t length)
236 /* checks the length */
242 return websock_send(ws, 1, 0, 0, 0, OPCODE_PONG, data, length);
245 int websock_text(struct websock *ws, int last, const void *text, size_t length)
247 return websock_send(ws, last, 0, 0, 0, OPCODE_TEXT, text, length);
250 int websock_text_v(struct websock *ws, int last, const struct iovec *iovec, int count)
252 return websock_send_v(ws, last, 0, 0, 0, OPCODE_TEXT, iovec, count);
255 int websock_binary(struct websock *ws, int last, const void *data, size_t length)
257 return websock_send(ws, last, 0, 0, 0, OPCODE_BINARY, data, length);
260 int websock_binary_v(struct websock *ws, int last, const struct iovec *iovec, int count)
262 return websock_send_v(ws, last, 0, 0, 0, OPCODE_BINARY, iovec, count);
265 int websock_continue(struct websock *ws, int last, const void *data, size_t length)
267 return websock_send(ws, last, 0, 0, 0, OPCODE_CONTINUATION, data, length);
270 int websock_continue_v(struct websock *ws, int last, const struct iovec *iovec, int count)
272 return websock_send_v(ws, last, 0, 0, 0, OPCODE_CONTINUATION, iovec, count);
275 int websock_error(struct websock *ws, uint16_t code, const void *data, size_t size)
277 int rc = websock_close(ws, code, data, size);
278 if (ws->itf->on_error != NULL)
279 ws->itf->on_error(ws->closure, code, data, size);
283 static int read_header(struct websock *ws)
285 if (ws->lenhead < ws->szhead) {
287 ws_read(ws, &ws->header[ws->lenhead], (size_t)(ws->szhead - ws->lenhead));
290 ws->lenhead += (int)rbc;
295 static int check_control_header(struct websock *ws)
298 if (FRAME_GET_RSV1(ws->header[0]) != 0)
300 if (FRAME_GET_RSV2(ws->header[0]) != 0)
302 if (FRAME_GET_RSV3(ws->header[0]) != 0)
304 if (FRAME_GET_PAYLOAD_LEN(ws->header[1]) > 125)
306 if (FRAME_GET_OPCODE(ws->header[0]) == OPCODE_CLOSE)
307 return FRAME_GET_PAYLOAD_LEN(ws->header[1]) != 1;
311 int websock_dispatch(struct websock *ws, int loop)
319 ws->state = STATE_START;
323 /* read the header */
326 else if (ws->lenhead < ws->szhead)
329 switch (FRAME_GET_OPCODE(ws->header[0])) {
330 case OPCODE_CONTINUATION:
335 if (!check_control_header(ws))
337 if (FRAME_GET_PAYLOAD_LEN(ws->header[1]))
342 if (!check_control_header(ws))
347 /* update heading size */
348 switch (FRAME_GET_PAYLOAD_LEN(ws->header[1])) {
356 ws->szhead += 4 * FRAME_GET_MASK(ws->header[1]);
358 ws->state = STATE_LENGTH;
362 /* continue to read the header */
365 else if (ws->lenhead < ws->szhead)
369 switch (FRAME_GET_PAYLOAD_LEN(ws->header[1])) {
371 ws->length = (((uint64_t) ws->header[2]) << 56)
372 | (((uint64_t) ws->header[3]) << 48)
373 | (((uint64_t) ws->header[4]) << 40)
374 | (((uint64_t) ws->header[5]) << 32)
375 | (((uint64_t) ws->header[6]) << 24)
376 | (((uint64_t) ws->header[7]) << 16)
377 | (((uint64_t) ws->header[8]) << 8)
378 | (uint64_t) ws->header[9];
381 ws->length = (((uint64_t) ws->header[2]) << 8)
382 | (uint64_t) ws->header[3];
385 ws->length = FRAME_GET_PAYLOAD_LEN(ws->header[1]);
388 if (FRAME_GET_OPCODE(ws->header[0]) == OPCODE_CLOSE && ws->length != 0)
390 if (ws->length > ws->maxlength)
394 if (FRAME_GET_MASK(ws->header[1])) {
395 ((unsigned char *)&ws->mask)[0] = ws->header[ws->szhead - 4];
396 ((unsigned char *)&ws->mask)[1] = ws->header[ws->szhead - 3];
397 ((unsigned char *)&ws->mask)[2] = ws->header[ws->szhead - 2];
398 ((unsigned char *)&ws->mask)[3] = ws->header[ws->szhead - 1];
402 /* all heading fields are known, process */
403 ws->state = STATE_DATA;
404 if (ws->itf->on_extension != NULL) {
405 if (ws->itf->on_extension(ws->closure,
406 FRAME_GET_FIN(ws->header[0]),
407 FRAME_GET_RSV1(ws->header[0]),
408 FRAME_GET_RSV2(ws->header[0]),
409 FRAME_GET_RSV3(ws->header[0]),
410 FRAME_GET_OPCODE(ws->header[0]),
411 (size_t) ws->length)) {
416 /* not an extension case */
417 if (FRAME_GET_RSV1(ws->header[0]) != 0)
419 if (FRAME_GET_RSV2(ws->header[0]) != 0)
421 if (FRAME_GET_RSV3(ws->header[0]) != 0)
425 switch (FRAME_GET_OPCODE(ws->header[0])) {
426 case OPCODE_CONTINUATION:
427 ws->itf->on_continue(ws->closure,
428 FRAME_GET_FIN(ws->header[0]),
429 (size_t) ws->length);
434 ws->itf->on_text(ws->closure,
435 FRAME_GET_FIN(ws->header[0]),
436 (size_t) ws->length);
441 ws->itf->on_binary(ws->closure,
442 FRAME_GET_FIN(ws->header[0]),
443 (size_t) ws->length);
449 code = WEBSOCKET_CODE_NOT_SET;
451 code = (uint16_t)(ws->header[ws->szhead - 2] & 0xff);
452 code = (uint16_t)(code << 8);
453 code = (uint16_t)(code | (uint16_t)(ws->header[ws->szhead - 1] & 0xff));
455 ws->itf->on_close(ws->closure, code, (size_t) ws->length);
458 if (ws->itf->on_ping)
459 ws->itf->on_ping(ws->closure, ws->length);
462 websock_pong(ws, NULL, 0);
464 ws->state = STATE_INIT;
469 if (ws->itf->on_pong)
470 ws->itf->on_pong(ws->closure, ws->length);
473 ws->state = STATE_INIT;
485 ws->state = STATE_INIT;
491 websock_error(ws, WEBSOCKET_CODE_MESSAGE_TOO_LARGE, NULL, 0);
495 websock_error(ws, WEBSOCKET_CODE_PROTOCOL_ERROR, NULL, 0);
499 static void unmask(struct websock * ws, void *buffer, size_t size)
506 while (size && ((sizeof(uint32_t) - 1) & (uintptr_t) b8)) {
507 m = ((uint8_t *) & mask)[0];
508 ((uint8_t *) & mask)[0] = ((uint8_t *) & mask)[1];
509 ((uint8_t *) & mask)[1] = ((uint8_t *) & mask)[2];
510 ((uint8_t *) & mask)[2] = ((uint8_t *) & mask)[3];
511 ((uint8_t *) & mask)[3] = m;
515 b32 = (uint32_t *) b8;
516 while (size >= sizeof(uint32_t)) {
518 size -= sizeof(uint32_t);
520 b8 = (uint8_t *) b32;
522 m = ((uint8_t *) & mask)[0];
523 ((uint8_t *) & mask)[0] = ((uint8_t *) & mask)[1];
524 ((uint8_t *) & mask)[1] = ((uint8_t *) & mask)[2];
525 ((uint8_t *) & mask)[2] = ((uint8_t *) & mask)[3];
526 ((uint8_t *) & mask)[3] = m;
533 ssize_t websock_read(struct websock * ws, void *buffer, size_t size)
537 if (ws->state != STATE_DATA)
540 if (size > ws->length)
541 size = (size_t) ws->length;
543 rc = ws_read(ws, buffer, size);
549 unmask(ws, buffer, size);
554 int websock_drop(struct websock *ws)
559 if (websock_read(ws, buffer, sizeof buffer) < 0)
564 struct websock *websock_create_v13(const struct websock_itf *itf, void *closure)
566 struct websock *result = calloc(1, sizeof *result);
569 result->closure = closure;
570 result->maxlength = default_maxlength;
575 void websock_destroy(struct websock *ws)
580 void websock_set_default_max_length(size_t maxlen)
582 default_maxlength = maxlen;
585 void websock_set_max_length(struct websock *ws, size_t maxlen)
587 ws->maxlength = (uint64_t)maxlen;