quorum: Avoid bdrv_aio_writev() for rewrites
[qemu.git] / io / channel-websock.c
1 /*
2 * QEMU I/O channels driver websockets
3 *
4 * Copyright (c) 2015 Red Hat, Inc.
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18 *
19 */
20
21 #include "qemu/osdep.h"
22 #include "qapi/error.h"
23 #include "qemu/bswap.h"
24 #include "io/channel-websock.h"
25 #include "crypto/hash.h"
26 #include "trace.h"
27
28
29 /* Max amount to allow in rawinput/rawoutput buffers */
30 #define QIO_CHANNEL_WEBSOCK_MAX_BUFFER 8192
31
32 #define QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN 24
33 #define QIO_CHANNEL_WEBSOCK_GUID "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
34 #define QIO_CHANNEL_WEBSOCK_GUID_LEN strlen(QIO_CHANNEL_WEBSOCK_GUID)
35
36 #define QIO_CHANNEL_WEBSOCK_HEADER_PROTOCOL "Sec-WebSocket-Protocol"
37 #define QIO_CHANNEL_WEBSOCK_HEADER_VERSION "Sec-WebSocket-Version"
38 #define QIO_CHANNEL_WEBSOCK_HEADER_KEY "Sec-WebSocket-Key"
39
40 #define QIO_CHANNEL_WEBSOCK_PROTOCOL_BINARY "binary"
41
42 #define QIO_CHANNEL_WEBSOCK_HANDSHAKE_RESPONSE \
43 "HTTP/1.1 101 Switching Protocols\r\n" \
44 "Upgrade: websocket\r\n" \
45 "Connection: Upgrade\r\n" \
46 "Sec-WebSocket-Accept: %s\r\n" \
47 "Sec-WebSocket-Protocol: binary\r\n" \
48 "\r\n"
49 #define QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM "\r\n"
50 #define QIO_CHANNEL_WEBSOCK_HANDSHAKE_END "\r\n\r\n"
51 #define QIO_CHANNEL_WEBSOCK_SUPPORTED_VERSION "13"
52
53 /* The websockets packet header is variable length
54 * depending on the size of the payload... */
55
56 /* ...length when using 7-bit payload length */
57 #define QIO_CHANNEL_WEBSOCK_HEADER_LEN_7_BIT 6
58 /* ...length when using 16-bit payload length */
59 #define QIO_CHANNEL_WEBSOCK_HEADER_LEN_16_BIT 8
60 /* ...length when using 64-bit payload length */
61 #define QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT 14
62
63 /* Length of the optional data mask field in header */
64 #define QIO_CHANNEL_WEBSOCK_HEADER_LEN_MASK 4
65
66 /* Maximum length that can fit in 7-bit payload size */
67 #define QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_THRESHOLD_7_BIT 126
68 /* Maximum length that can fit in 16-bit payload size */
69 #define QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_THRESHOLD_16_BIT 65536
70
71 /* Magic 7-bit length to indicate use of 16-bit payload length */
72 #define QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_16_BIT 126
73 /* Magic 7-bit length to indicate use of 64-bit payload length */
74 #define QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_64_BIT 127
75
76 /* Bitmasks & shifts for accessing header fields */
77 #define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_FIN 0x80
78 #define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_OPCODE 0x0f
79 #define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_HAS_MASK 0x80
80 #define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_PAYLOAD_LEN 0x7f
81 #define QIO_CHANNEL_WEBSOCK_HEADER_SHIFT_FIN 7
82 #define QIO_CHANNEL_WEBSOCK_HEADER_SHIFT_HAS_MASK 7
83
84 typedef struct QIOChannelWebsockHeader QIOChannelWebsockHeader;
85
86 struct QEMU_PACKED QIOChannelWebsockHeader {
87 unsigned char b0;
88 unsigned char b1;
89 union {
90 struct QEMU_PACKED {
91 uint16_t l16;
92 QIOChannelWebsockMask m16;
93 } s16;
94 struct QEMU_PACKED {
95 uint64_t l64;
96 QIOChannelWebsockMask m64;
97 } s64;
98 QIOChannelWebsockMask m;
99 } u;
100 };
101
102 enum {
103 QIO_CHANNEL_WEBSOCK_OPCODE_CONTINUATION = 0x0,
104 QIO_CHANNEL_WEBSOCK_OPCODE_TEXT_FRAME = 0x1,
105 QIO_CHANNEL_WEBSOCK_OPCODE_BINARY_FRAME = 0x2,
106 QIO_CHANNEL_WEBSOCK_OPCODE_CLOSE = 0x8,
107 QIO_CHANNEL_WEBSOCK_OPCODE_PING = 0x9,
108 QIO_CHANNEL_WEBSOCK_OPCODE_PONG = 0xA
109 };
110
111 static char *qio_channel_websock_handshake_entry(const char *handshake,
112 size_t handshake_len,
113 const char *name)
114 {
115 char *begin, *end, *ret = NULL;
116 char *line = g_strdup_printf("%s%s: ",
117 QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM,
118 name);
119 begin = g_strstr_len(handshake, handshake_len, line);
120 if (begin != NULL) {
121 begin += strlen(line);
122 end = g_strstr_len(begin, handshake_len - (begin - handshake),
123 QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM);
124 if (end != NULL) {
125 ret = g_strndup(begin, end - begin);
126 }
127 }
128 g_free(line);
129 return ret;
130 }
131
132
133 static int qio_channel_websock_handshake_send_response(QIOChannelWebsock *ioc,
134 const char *key,
135 Error **errp)
136 {
137 char combined_key[QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN +
138 QIO_CHANNEL_WEBSOCK_GUID_LEN + 1];
139 char *accept = NULL, *response = NULL;
140 size_t responselen;
141
142 g_strlcpy(combined_key, key, QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN + 1);
143 g_strlcat(combined_key, QIO_CHANNEL_WEBSOCK_GUID,
144 QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN +
145 QIO_CHANNEL_WEBSOCK_GUID_LEN + 1);
146
147 /* hash and encode it */
148 if (qcrypto_hash_base64(QCRYPTO_HASH_ALG_SHA1,
149 combined_key,
150 QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN +
151 QIO_CHANNEL_WEBSOCK_GUID_LEN,
152 &accept,
153 errp) < 0) {
154 return -1;
155 }
156
157 response = g_strdup_printf(QIO_CHANNEL_WEBSOCK_HANDSHAKE_RESPONSE, accept);
158 responselen = strlen(response);
159 buffer_reserve(&ioc->encoutput, responselen);
160 buffer_append(&ioc->encoutput, response, responselen);
161
162 g_free(accept);
163 g_free(response);
164
165 return 0;
166 }
167
168 static int qio_channel_websock_handshake_process(QIOChannelWebsock *ioc,
169 const char *line,
170 size_t size,
171 Error **errp)
172 {
173 int ret = -1;
174 char *protocols = qio_channel_websock_handshake_entry(
175 line, size, QIO_CHANNEL_WEBSOCK_HEADER_PROTOCOL);
176 char *version = qio_channel_websock_handshake_entry(
177 line, size, QIO_CHANNEL_WEBSOCK_HEADER_VERSION);
178 char *key = qio_channel_websock_handshake_entry(
179 line, size, QIO_CHANNEL_WEBSOCK_HEADER_KEY);
180
181 if (!protocols) {
182 error_setg(errp, "Missing websocket protocol header data");
183 goto cleanup;
184 }
185
186 if (!version) {
187 error_setg(errp, "Missing websocket version header data");
188 goto cleanup;
189 }
190
191 if (!key) {
192 error_setg(errp, "Missing websocket key header data");
193 goto cleanup;
194 }
195
196 if (!g_strrstr(protocols, QIO_CHANNEL_WEBSOCK_PROTOCOL_BINARY)) {
197 error_setg(errp, "No '%s' protocol is supported by client '%s'",
198 QIO_CHANNEL_WEBSOCK_PROTOCOL_BINARY, protocols);
199 goto cleanup;
200 }
201
202 if (!g_str_equal(version, QIO_CHANNEL_WEBSOCK_SUPPORTED_VERSION)) {
203 error_setg(errp, "Version '%s' is not supported by client '%s'",
204 QIO_CHANNEL_WEBSOCK_SUPPORTED_VERSION, version);
205 goto cleanup;
206 }
207
208 if (strlen(key) != QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN) {
209 error_setg(errp, "Key length '%zu' was not as expected '%d'",
210 strlen(key), QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN);
211 goto cleanup;
212 }
213
214 ret = qio_channel_websock_handshake_send_response(ioc, key, errp);
215
216 cleanup:
217 g_free(protocols);
218 g_free(version);
219 g_free(key);
220 return ret;
221 }
222
223 static int qio_channel_websock_handshake_read(QIOChannelWebsock *ioc,
224 Error **errp)
225 {
226 char *handshake_end;
227 ssize_t ret;
228 /* Typical HTTP headers from novnc are 512 bytes, so limiting
229 * total header size to 4096 is easily enough. */
230 size_t want = 4096 - ioc->encinput.offset;
231 buffer_reserve(&ioc->encinput, want);
232 ret = qio_channel_read(ioc->master,
233 (char *)buffer_end(&ioc->encinput), want, errp);
234 if (ret < 0) {
235 return -1;
236 }
237 ioc->encinput.offset += ret;
238
239 handshake_end = g_strstr_len((char *)ioc->encinput.buffer,
240 ioc->encinput.offset,
241 QIO_CHANNEL_WEBSOCK_HANDSHAKE_END);
242 if (!handshake_end) {
243 if (ioc->encinput.offset >= 4096) {
244 error_setg(errp,
245 "End of headers not found in first 4096 bytes");
246 return -1;
247 } else {
248 return 0;
249 }
250 }
251
252 if (qio_channel_websock_handshake_process(ioc,
253 (char *)ioc->encinput.buffer,
254 ioc->encinput.offset,
255 errp) < 0) {
256 return -1;
257 }
258
259 buffer_advance(&ioc->encinput,
260 handshake_end - (char *)ioc->encinput.buffer +
261 strlen(QIO_CHANNEL_WEBSOCK_HANDSHAKE_END));
262 return 1;
263 }
264
265 static gboolean qio_channel_websock_handshake_send(QIOChannel *ioc,
266 GIOCondition condition,
267 gpointer user_data)
268 {
269 QIOTask *task = user_data;
270 QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(
271 qio_task_get_source(task));
272 Error *err = NULL;
273 ssize_t ret;
274
275 ret = qio_channel_write(wioc->master,
276 (char *)wioc->encoutput.buffer,
277 wioc->encoutput.offset,
278 &err);
279
280 if (ret < 0) {
281 trace_qio_channel_websock_handshake_fail(ioc);
282 qio_task_abort(task, err);
283 error_free(err);
284 return FALSE;
285 }
286
287 buffer_advance(&wioc->encoutput, ret);
288 if (wioc->encoutput.offset == 0) {
289 trace_qio_channel_websock_handshake_complete(ioc);
290 qio_task_complete(task);
291 return FALSE;
292 }
293 trace_qio_channel_websock_handshake_pending(ioc, G_IO_OUT);
294 return TRUE;
295 }
296
297 static gboolean qio_channel_websock_handshake_io(QIOChannel *ioc,
298 GIOCondition condition,
299 gpointer user_data)
300 {
301 QIOTask *task = user_data;
302 QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(
303 qio_task_get_source(task));
304 Error *err = NULL;
305 int ret;
306
307 ret = qio_channel_websock_handshake_read(wioc, &err);
308 if (ret < 0) {
309 trace_qio_channel_websock_handshake_fail(ioc);
310 qio_task_abort(task, err);
311 error_free(err);
312 return FALSE;
313 }
314 if (ret == 0) {
315 trace_qio_channel_websock_handshake_pending(ioc, G_IO_IN);
316 /* need more data still */
317 return TRUE;
318 }
319
320 trace_qio_channel_websock_handshake_reply(ioc);
321 qio_channel_add_watch(
322 wioc->master,
323 G_IO_OUT,
324 qio_channel_websock_handshake_send,
325 task,
326 NULL);
327 return FALSE;
328 }
329
330
331 static void qio_channel_websock_encode(QIOChannelWebsock *ioc)
332 {
333 size_t header_size;
334 union {
335 char buf[QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT];
336 QIOChannelWebsockHeader ws;
337 } header;
338
339 if (!ioc->rawoutput.offset) {
340 return;
341 }
342
343 header.ws.b0 = (1 << QIO_CHANNEL_WEBSOCK_HEADER_SHIFT_FIN) |
344 (QIO_CHANNEL_WEBSOCK_OPCODE_BINARY_FRAME &
345 QIO_CHANNEL_WEBSOCK_HEADER_FIELD_OPCODE);
346 if (ioc->rawoutput.offset <
347 QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_THRESHOLD_7_BIT) {
348 header.ws.b1 = (uint8_t)ioc->rawoutput.offset;
349 header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_7_BIT;
350 } else if (ioc->rawoutput.offset <
351 QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_THRESHOLD_16_BIT) {
352 header.ws.b1 = QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_16_BIT;
353 header.ws.u.s16.l16 = cpu_to_be16((uint16_t)ioc->rawoutput.offset);
354 header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_16_BIT;
355 } else {
356 header.ws.b1 = QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_64_BIT;
357 header.ws.u.s64.l64 = cpu_to_be64(ioc->rawoutput.offset);
358 header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT;
359 }
360 header_size -= QIO_CHANNEL_WEBSOCK_HEADER_LEN_MASK;
361
362 buffer_reserve(&ioc->encoutput, header_size + ioc->rawoutput.offset);
363 buffer_append(&ioc->encoutput, header.buf, header_size);
364 buffer_append(&ioc->encoutput, ioc->rawoutput.buffer,
365 ioc->rawoutput.offset);
366 buffer_reset(&ioc->rawoutput);
367 }
368
369
370 static ssize_t qio_channel_websock_decode_header(QIOChannelWebsock *ioc,
371 Error **errp)
372 {
373 unsigned char opcode, fin, has_mask;
374 size_t header_size;
375 size_t payload_len;
376 QIOChannelWebsockHeader *header =
377 (QIOChannelWebsockHeader *)ioc->encinput.buffer;
378
379 if (ioc->payload_remain) {
380 error_setg(errp,
381 "Decoding header but %zu bytes of payload remain",
382 ioc->payload_remain);
383 return -1;
384 }
385 if (ioc->encinput.offset < QIO_CHANNEL_WEBSOCK_HEADER_LEN_7_BIT) {
386 /* header not complete */
387 return QIO_CHANNEL_ERR_BLOCK;
388 }
389
390 fin = (header->b0 & QIO_CHANNEL_WEBSOCK_HEADER_FIELD_FIN) >>
391 QIO_CHANNEL_WEBSOCK_HEADER_SHIFT_FIN;
392 opcode = header->b0 & QIO_CHANNEL_WEBSOCK_HEADER_FIELD_OPCODE;
393 has_mask = (header->b1 & QIO_CHANNEL_WEBSOCK_HEADER_FIELD_HAS_MASK) >>
394 QIO_CHANNEL_WEBSOCK_HEADER_SHIFT_HAS_MASK;
395 payload_len = header->b1 & QIO_CHANNEL_WEBSOCK_HEADER_FIELD_PAYLOAD_LEN;
396
397 if (opcode == QIO_CHANNEL_WEBSOCK_OPCODE_CLOSE) {
398 /* disconnect */
399 return 0;
400 }
401
402 /* Websocket frame sanity check:
403 * * Websocket fragmentation is not supported.
404 * * All websockets frames sent by a client have to be masked.
405 * * Only binary encoding is supported.
406 */
407 if (!fin) {
408 error_setg(errp, "websocket fragmentation is not supported");
409 return -1;
410 }
411 if (!has_mask) {
412 error_setg(errp, "websocket frames must be masked");
413 return -1;
414 }
415 if (opcode != QIO_CHANNEL_WEBSOCK_OPCODE_BINARY_FRAME) {
416 error_setg(errp, "only binary websocket frames are supported");
417 return -1;
418 }
419
420 if (payload_len < QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_16_BIT) {
421 ioc->payload_remain = payload_len;
422 header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_7_BIT;
423 ioc->mask = header->u.m;
424 } else if (payload_len == QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_16_BIT &&
425 ioc->encinput.offset >= QIO_CHANNEL_WEBSOCK_HEADER_LEN_16_BIT) {
426 ioc->payload_remain = be16_to_cpu(header->u.s16.l16);
427 header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_16_BIT;
428 ioc->mask = header->u.s16.m16;
429 } else if (payload_len == QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_64_BIT &&
430 ioc->encinput.offset >= QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT) {
431 ioc->payload_remain = be64_to_cpu(header->u.s64.l64);
432 header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT;
433 ioc->mask = header->u.s64.m64;
434 } else {
435 /* header not complete */
436 return QIO_CHANNEL_ERR_BLOCK;
437 }
438
439 buffer_advance(&ioc->encinput, header_size);
440 return 1;
441 }
442
443
444 static ssize_t qio_channel_websock_decode_payload(QIOChannelWebsock *ioc,
445 Error **errp)
446 {
447 size_t i;
448 size_t payload_len;
449 uint32_t *payload32;
450
451 if (!ioc->payload_remain) {
452 error_setg(errp,
453 "Decoding payload but no bytes of payload remain");
454 return -1;
455 }
456
457 /* If we aren't at the end of the payload, then drop
458 * off the last bytes, so we're always multiple of 4
459 * for purpose of unmasking, except at end of payload
460 */
461 if (ioc->encinput.offset < ioc->payload_remain) {
462 payload_len = ioc->encinput.offset - (ioc->encinput.offset % 4);
463 } else {
464 payload_len = ioc->payload_remain;
465 }
466 if (payload_len == 0) {
467 return QIO_CHANNEL_ERR_BLOCK;
468 }
469
470 ioc->payload_remain -= payload_len;
471
472 /* unmask frame */
473 /* process 1 frame (32 bit op) */
474 payload32 = (uint32_t *)ioc->encinput.buffer;
475 for (i = 0; i < payload_len / 4; i++) {
476 payload32[i] ^= ioc->mask.u;
477 }
478 /* process the remaining bytes (if any) */
479 for (i *= 4; i < payload_len; i++) {
480 ioc->encinput.buffer[i] ^= ioc->mask.c[i % 4];
481 }
482
483 buffer_reserve(&ioc->rawinput, payload_len);
484 buffer_append(&ioc->rawinput, ioc->encinput.buffer, payload_len);
485 buffer_advance(&ioc->encinput, payload_len);
486 return payload_len;
487 }
488
489
490 QIOChannelWebsock *
491 qio_channel_websock_new_server(QIOChannel *master)
492 {
493 QIOChannelWebsock *wioc;
494 QIOChannel *ioc;
495
496 wioc = QIO_CHANNEL_WEBSOCK(object_new(TYPE_QIO_CHANNEL_WEBSOCK));
497 ioc = QIO_CHANNEL(wioc);
498
499 wioc->master = master;
500 if (qio_channel_has_feature(master, QIO_CHANNEL_FEATURE_SHUTDOWN)) {
501 qio_channel_set_feature(ioc, QIO_CHANNEL_FEATURE_SHUTDOWN);
502 }
503 object_ref(OBJECT(master));
504
505 trace_qio_channel_websock_new_server(wioc, master);
506 return wioc;
507 }
508
509 void qio_channel_websock_handshake(QIOChannelWebsock *ioc,
510 QIOTaskFunc func,
511 gpointer opaque,
512 GDestroyNotify destroy)
513 {
514 QIOTask *task;
515
516 task = qio_task_new(OBJECT(ioc),
517 func,
518 opaque,
519 destroy);
520
521 trace_qio_channel_websock_handshake_start(ioc);
522 trace_qio_channel_websock_handshake_pending(ioc, G_IO_IN);
523 qio_channel_add_watch(ioc->master,
524 G_IO_IN,
525 qio_channel_websock_handshake_io,
526 task,
527 NULL);
528 }
529
530
531 static void qio_channel_websock_finalize(Object *obj)
532 {
533 QIOChannelWebsock *ioc = QIO_CHANNEL_WEBSOCK(obj);
534
535 buffer_free(&ioc->encinput);
536 buffer_free(&ioc->encoutput);
537 buffer_free(&ioc->rawinput);
538 buffer_free(&ioc->rawoutput);
539 object_unref(OBJECT(ioc->master));
540 if (ioc->io_tag) {
541 g_source_remove(ioc->io_tag);
542 }
543 if (ioc->io_err) {
544 error_free(ioc->io_err);
545 }
546 }
547
548
549 static ssize_t qio_channel_websock_read_wire(QIOChannelWebsock *ioc,
550 Error **errp)
551 {
552 ssize_t ret;
553
554 if (ioc->encinput.offset < 4096) {
555 size_t want = 4096 - ioc->encinput.offset;
556
557 buffer_reserve(&ioc->encinput, want);
558 ret = qio_channel_read(ioc->master,
559 (char *)ioc->encinput.buffer +
560 ioc->encinput.offset,
561 want,
562 errp);
563 if (ret < 0) {
564 return ret;
565 }
566 if (ret == 0 &&
567 ioc->encinput.offset == 0) {
568 return 0;
569 }
570 ioc->encinput.offset += ret;
571 }
572
573 if (ioc->payload_remain == 0) {
574 ret = qio_channel_websock_decode_header(ioc, errp);
575 if (ret < 0) {
576 return ret;
577 }
578 if (ret == 0) {
579 return 0;
580 }
581 }
582
583 ret = qio_channel_websock_decode_payload(ioc, errp);
584 if (ret < 0) {
585 return ret;
586 }
587 return ret;
588 }
589
590
591 static ssize_t qio_channel_websock_write_wire(QIOChannelWebsock *ioc,
592 Error **errp)
593 {
594 ssize_t ret;
595 ssize_t done = 0;
596 qio_channel_websock_encode(ioc);
597
598 while (ioc->encoutput.offset > 0) {
599 ret = qio_channel_write(ioc->master,
600 (char *)ioc->encoutput.buffer,
601 ioc->encoutput.offset,
602 errp);
603 if (ret < 0) {
604 if (ret == QIO_CHANNEL_ERR_BLOCK &&
605 done > 0) {
606 return done;
607 } else {
608 return ret;
609 }
610 }
611 buffer_advance(&ioc->encoutput, ret);
612 done += ret;
613 }
614 return done;
615 }
616
617
618 static void qio_channel_websock_flush_free(gpointer user_data)
619 {
620 QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(user_data);
621 object_unref(OBJECT(wioc));
622 }
623
624 static void qio_channel_websock_set_watch(QIOChannelWebsock *ioc);
625
626 static gboolean qio_channel_websock_flush(QIOChannel *ioc,
627 GIOCondition condition,
628 gpointer user_data)
629 {
630 QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(user_data);
631 ssize_t ret;
632
633 if (condition & G_IO_OUT) {
634 ret = qio_channel_websock_write_wire(wioc, &wioc->io_err);
635 if (ret < 0) {
636 goto cleanup;
637 }
638 }
639
640 if (condition & G_IO_IN) {
641 ret = qio_channel_websock_read_wire(wioc, &wioc->io_err);
642 if (ret < 0) {
643 goto cleanup;
644 }
645 if (ret == 0) {
646 wioc->io_eof = TRUE;
647 }
648 }
649
650 cleanup:
651 qio_channel_websock_set_watch(wioc);
652 return FALSE;
653 }
654
655
656 static void qio_channel_websock_unset_watch(QIOChannelWebsock *ioc)
657 {
658 if (ioc->io_tag) {
659 g_source_remove(ioc->io_tag);
660 ioc->io_tag = 0;
661 }
662 }
663
664 static void qio_channel_websock_set_watch(QIOChannelWebsock *ioc)
665 {
666 GIOCondition cond = 0;
667
668 qio_channel_websock_unset_watch(ioc);
669
670 if (ioc->io_err) {
671 return;
672 }
673
674 if (ioc->encoutput.offset) {
675 cond |= G_IO_OUT;
676 }
677 if (ioc->encinput.offset < QIO_CHANNEL_WEBSOCK_MAX_BUFFER &&
678 !ioc->io_eof) {
679 cond |= G_IO_IN;
680 }
681
682 if (cond) {
683 object_ref(OBJECT(ioc));
684 ioc->io_tag =
685 qio_channel_add_watch(ioc->master,
686 cond,
687 qio_channel_websock_flush,
688 ioc,
689 qio_channel_websock_flush_free);
690 }
691 }
692
693
694 static ssize_t qio_channel_websock_readv(QIOChannel *ioc,
695 const struct iovec *iov,
696 size_t niov,
697 int **fds,
698 size_t *nfds,
699 Error **errp)
700 {
701 QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(ioc);
702 size_t i;
703 ssize_t got = 0;
704 ssize_t ret;
705
706 if (wioc->io_err) {
707 *errp = error_copy(wioc->io_err);
708 return -1;
709 }
710
711 if (!wioc->rawinput.offset) {
712 ret = qio_channel_websock_read_wire(QIO_CHANNEL_WEBSOCK(ioc), errp);
713 if (ret < 0) {
714 return ret;
715 }
716 }
717
718 for (i = 0 ; i < niov ; i++) {
719 size_t want = iov[i].iov_len;
720 if (want > (wioc->rawinput.offset - got)) {
721 want = (wioc->rawinput.offset - got);
722 }
723
724 memcpy(iov[i].iov_base,
725 wioc->rawinput.buffer + got,
726 want);
727 got += want;
728
729 if (want < iov[i].iov_len) {
730 break;
731 }
732 }
733
734 buffer_advance(&wioc->rawinput, got);
735 qio_channel_websock_set_watch(wioc);
736 return got;
737 }
738
739
740 static ssize_t qio_channel_websock_writev(QIOChannel *ioc,
741 const struct iovec *iov,
742 size_t niov,
743 int *fds,
744 size_t nfds,
745 Error **errp)
746 {
747 QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(ioc);
748 size_t i;
749 ssize_t done = 0;
750 ssize_t ret;
751
752 if (wioc->io_err) {
753 *errp = error_copy(wioc->io_err);
754 return -1;
755 }
756
757 if (wioc->io_eof) {
758 error_setg(errp, "%s", "Broken pipe");
759 return -1;
760 }
761
762 for (i = 0; i < niov; i++) {
763 size_t want = iov[i].iov_len;
764 if ((want + wioc->rawoutput.offset) > QIO_CHANNEL_WEBSOCK_MAX_BUFFER) {
765 want = (QIO_CHANNEL_WEBSOCK_MAX_BUFFER - wioc->rawoutput.offset);
766 }
767 if (want == 0) {
768 goto done;
769 }
770
771 buffer_reserve(&wioc->rawoutput, want);
772 buffer_append(&wioc->rawoutput, iov[i].iov_base, want);
773 done += want;
774 if (want < iov[i].iov_len) {
775 break;
776 }
777 }
778
779 done:
780 ret = qio_channel_websock_write_wire(wioc, errp);
781 if (ret < 0 &&
782 ret != QIO_CHANNEL_ERR_BLOCK) {
783 qio_channel_websock_unset_watch(wioc);
784 return -1;
785 }
786
787 qio_channel_websock_set_watch(wioc);
788
789 if (done == 0) {
790 return QIO_CHANNEL_ERR_BLOCK;
791 }
792
793 return done;
794 }
795
796 static int qio_channel_websock_set_blocking(QIOChannel *ioc,
797 bool enabled,
798 Error **errp)
799 {
800 QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(ioc);
801
802 qio_channel_set_blocking(wioc->master, enabled, errp);
803 return 0;
804 }
805
806 static void qio_channel_websock_set_delay(QIOChannel *ioc,
807 bool enabled)
808 {
809 QIOChannelWebsock *tioc = QIO_CHANNEL_WEBSOCK(ioc);
810
811 qio_channel_set_delay(tioc->master, enabled);
812 }
813
814 static void qio_channel_websock_set_cork(QIOChannel *ioc,
815 bool enabled)
816 {
817 QIOChannelWebsock *tioc = QIO_CHANNEL_WEBSOCK(ioc);
818
819 qio_channel_set_cork(tioc->master, enabled);
820 }
821
822 static int qio_channel_websock_shutdown(QIOChannel *ioc,
823 QIOChannelShutdown how,
824 Error **errp)
825 {
826 QIOChannelWebsock *tioc = QIO_CHANNEL_WEBSOCK(ioc);
827
828 return qio_channel_shutdown(tioc->master, how, errp);
829 }
830
831 static int qio_channel_websock_close(QIOChannel *ioc,
832 Error **errp)
833 {
834 QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(ioc);
835
836 return qio_channel_close(wioc->master, errp);
837 }
838
839 typedef struct QIOChannelWebsockSource QIOChannelWebsockSource;
840 struct QIOChannelWebsockSource {
841 GSource parent;
842 QIOChannelWebsock *wioc;
843 GIOCondition condition;
844 };
845
846 static gboolean
847 qio_channel_websock_source_prepare(GSource *source,
848 gint *timeout)
849 {
850 QIOChannelWebsockSource *wsource = (QIOChannelWebsockSource *)source;
851 GIOCondition cond = 0;
852 *timeout = -1;
853
854 if (wsource->wioc->rawinput.offset) {
855 cond |= G_IO_IN;
856 }
857 if (wsource->wioc->rawoutput.offset < QIO_CHANNEL_WEBSOCK_MAX_BUFFER) {
858 cond |= G_IO_OUT;
859 }
860
861 return cond & wsource->condition;
862 }
863
864 static gboolean
865 qio_channel_websock_source_check(GSource *source)
866 {
867 QIOChannelWebsockSource *wsource = (QIOChannelWebsockSource *)source;
868 GIOCondition cond = 0;
869
870 if (wsource->wioc->rawinput.offset) {
871 cond |= G_IO_IN;
872 }
873 if (wsource->wioc->rawoutput.offset < QIO_CHANNEL_WEBSOCK_MAX_BUFFER) {
874 cond |= G_IO_OUT;
875 }
876
877 return cond & wsource->condition;
878 }
879
880 static gboolean
881 qio_channel_websock_source_dispatch(GSource *source,
882 GSourceFunc callback,
883 gpointer user_data)
884 {
885 QIOChannelFunc func = (QIOChannelFunc)callback;
886 QIOChannelWebsockSource *wsource = (QIOChannelWebsockSource *)source;
887 GIOCondition cond = 0;
888
889 if (wsource->wioc->rawinput.offset) {
890 cond |= G_IO_IN;
891 }
892 if (wsource->wioc->rawoutput.offset < QIO_CHANNEL_WEBSOCK_MAX_BUFFER) {
893 cond |= G_IO_OUT;
894 }
895
896 return (*func)(QIO_CHANNEL(wsource->wioc),
897 (cond & wsource->condition),
898 user_data);
899 }
900
901 static void
902 qio_channel_websock_source_finalize(GSource *source)
903 {
904 QIOChannelWebsockSource *ssource = (QIOChannelWebsockSource *)source;
905
906 object_unref(OBJECT(ssource->wioc));
907 }
908
909 GSourceFuncs qio_channel_websock_source_funcs = {
910 qio_channel_websock_source_prepare,
911 qio_channel_websock_source_check,
912 qio_channel_websock_source_dispatch,
913 qio_channel_websock_source_finalize
914 };
915
916 static GSource *qio_channel_websock_create_watch(QIOChannel *ioc,
917 GIOCondition condition)
918 {
919 QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(ioc);
920 QIOChannelWebsockSource *ssource;
921 GSource *source;
922
923 source = g_source_new(&qio_channel_websock_source_funcs,
924 sizeof(QIOChannelWebsockSource));
925 ssource = (QIOChannelWebsockSource *)source;
926
927 ssource->wioc = wioc;
928 object_ref(OBJECT(wioc));
929
930 ssource->condition = condition;
931
932 qio_channel_websock_set_watch(wioc);
933 return source;
934 }
935
936 static void qio_channel_websock_class_init(ObjectClass *klass,
937 void *class_data G_GNUC_UNUSED)
938 {
939 QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass);
940
941 ioc_klass->io_writev = qio_channel_websock_writev;
942 ioc_klass->io_readv = qio_channel_websock_readv;
943 ioc_klass->io_set_blocking = qio_channel_websock_set_blocking;
944 ioc_klass->io_set_cork = qio_channel_websock_set_cork;
945 ioc_klass->io_set_delay = qio_channel_websock_set_delay;
946 ioc_klass->io_close = qio_channel_websock_close;
947 ioc_klass->io_shutdown = qio_channel_websock_shutdown;
948 ioc_klass->io_create_watch = qio_channel_websock_create_watch;
949 }
950
951 static const TypeInfo qio_channel_websock_info = {
952 .parent = TYPE_QIO_CHANNEL,
953 .name = TYPE_QIO_CHANNEL_WEBSOCK,
954 .instance_size = sizeof(QIOChannelWebsock),
955 .instance_finalize = qio_channel_websock_finalize,
956 .class_init = qio_channel_websock_class_init,
957 };
958
959 static void qio_channel_websock_register_types(void)
960 {
961 type_register_static(&qio_channel_websock_info);
962 }
963
964 type_init(qio_channel_websock_register_types);