forked from queueRAM/qemu-irix
-
Notifications
You must be signed in to change notification settings - Fork 27
/
Copy pathchannel-websock.c
1323 lines (1130 loc) · 41.5 KB
/
channel-websock.c
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
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* QEMU I/O channels driver websockets
*
* Copyright (c) 2015 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/bswap.h"
#include "io/channel-websock.h"
#include "crypto/hash.h"
#include "trace.h"
#include "qemu/iov.h"
/* Max amount to allow in rawinput/encoutput buffers */
#define QIO_CHANNEL_WEBSOCK_MAX_BUFFER 8192
#define QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN 24
#define QIO_CHANNEL_WEBSOCK_GUID "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
#define QIO_CHANNEL_WEBSOCK_GUID_LEN strlen(QIO_CHANNEL_WEBSOCK_GUID)
#define QIO_CHANNEL_WEBSOCK_HEADER_PROTOCOL "sec-websocket-protocol"
#define QIO_CHANNEL_WEBSOCK_HEADER_VERSION "sec-websocket-version"
#define QIO_CHANNEL_WEBSOCK_HEADER_KEY "sec-websocket-key"
#define QIO_CHANNEL_WEBSOCK_HEADER_UPGRADE "upgrade"
#define QIO_CHANNEL_WEBSOCK_HEADER_HOST "host"
#define QIO_CHANNEL_WEBSOCK_HEADER_CONNECTION "connection"
#define QIO_CHANNEL_WEBSOCK_PROTOCOL_BINARY "binary"
#define QIO_CHANNEL_WEBSOCK_CONNECTION_UPGRADE "Upgrade"
#define QIO_CHANNEL_WEBSOCK_UPGRADE_WEBSOCKET "websocket"
#define QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_COMMON \
"Server: QEMU VNC\r\n" \
"Date: %s\r\n"
#define QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_OK \
"HTTP/1.1 101 Switching Protocols\r\n" \
QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_COMMON \
"Upgrade: websocket\r\n" \
"Connection: Upgrade\r\n" \
"Sec-WebSocket-Accept: %s\r\n" \
"Sec-WebSocket-Protocol: binary\r\n" \
"\r\n"
#define QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_NOT_FOUND \
"HTTP/1.1 404 Not Found\r\n" \
QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_COMMON \
"Connection: close\r\n" \
"\r\n"
#define QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_BAD_REQUEST \
"HTTP/1.1 400 Bad Request\r\n" \
QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_COMMON \
"Connection: close\r\n" \
"Sec-WebSocket-Version: " \
QIO_CHANNEL_WEBSOCK_SUPPORTED_VERSION \
"\r\n"
#define QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_SERVER_ERR \
"HTTP/1.1 500 Internal Server Error\r\n" \
QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_COMMON \
"Connection: close\r\n" \
"\r\n"
#define QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_TOO_LARGE \
"HTTP/1.1 403 Request Entity Too Large\r\n" \
QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_COMMON \
"Connection: close\r\n" \
"\r\n"
#define QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM "\r\n"
#define QIO_CHANNEL_WEBSOCK_HANDSHAKE_END "\r\n\r\n"
#define QIO_CHANNEL_WEBSOCK_SUPPORTED_VERSION "13"
#define QIO_CHANNEL_WEBSOCK_HTTP_METHOD "GET"
#define QIO_CHANNEL_WEBSOCK_HTTP_PATH "/"
#define QIO_CHANNEL_WEBSOCK_HTTP_VERSION "HTTP/1.1"
/* The websockets packet header is variable length
* depending on the size of the payload... */
/* ...length when using 7-bit payload length */
#define QIO_CHANNEL_WEBSOCK_HEADER_LEN_7_BIT 6
/* ...length when using 16-bit payload length */
#define QIO_CHANNEL_WEBSOCK_HEADER_LEN_16_BIT 8
/* ...length when using 64-bit payload length */
#define QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT 14
/* Length of the optional data mask field in header */
#define QIO_CHANNEL_WEBSOCK_HEADER_LEN_MASK 4
/* Maximum length that can fit in 7-bit payload size */
#define QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_THRESHOLD_7_BIT 126
/* Maximum length that can fit in 16-bit payload size */
#define QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_THRESHOLD_16_BIT 65536
/* Magic 7-bit length to indicate use of 16-bit payload length */
#define QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_16_BIT 126
/* Magic 7-bit length to indicate use of 64-bit payload length */
#define QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_64_BIT 127
/* Bitmasks for accessing header fields */
#define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_FIN 0x80
#define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_OPCODE 0x0f
#define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_HAS_MASK 0x80
#define QIO_CHANNEL_WEBSOCK_HEADER_FIELD_PAYLOAD_LEN 0x7f
#define QIO_CHANNEL_WEBSOCK_CONTROL_OPCODE_MASK 0x8
typedef struct QIOChannelWebsockHeader QIOChannelWebsockHeader;
struct QEMU_PACKED QIOChannelWebsockHeader {
unsigned char b0;
unsigned char b1;
union {
struct QEMU_PACKED {
uint16_t l16;
QIOChannelWebsockMask m16;
} s16;
struct QEMU_PACKED {
uint64_t l64;
QIOChannelWebsockMask m64;
} s64;
QIOChannelWebsockMask m;
} u;
};
typedef struct QIOChannelWebsockHTTPHeader QIOChannelWebsockHTTPHeader;
struct QIOChannelWebsockHTTPHeader {
char *name;
char *value;
};
enum {
QIO_CHANNEL_WEBSOCK_OPCODE_CONTINUATION = 0x0,
QIO_CHANNEL_WEBSOCK_OPCODE_TEXT_FRAME = 0x1,
QIO_CHANNEL_WEBSOCK_OPCODE_BINARY_FRAME = 0x2,
QIO_CHANNEL_WEBSOCK_OPCODE_CLOSE = 0x8,
QIO_CHANNEL_WEBSOCK_OPCODE_PING = 0x9,
QIO_CHANNEL_WEBSOCK_OPCODE_PONG = 0xA
};
static void GCC_FMT_ATTR(2, 3)
qio_channel_websock_handshake_send_res(QIOChannelWebsock *ioc,
const char *resmsg,
...)
{
va_list vargs;
char *response;
size_t responselen;
va_start(vargs, resmsg);
response = g_strdup_vprintf(resmsg, vargs);
responselen = strlen(response);
buffer_reserve(&ioc->encoutput, responselen);
buffer_append(&ioc->encoutput, response, responselen);
va_end(vargs);
}
static gchar *qio_channel_websock_date_str(void)
{
struct tm tm;
time_t now = time(NULL);
char datebuf[128];
gmtime_r(&now, &tm);
strftime(datebuf, sizeof(datebuf), "%a, %d %b %Y %H:%M:%S GMT", &tm);
return g_strdup(datebuf);
}
static void qio_channel_websock_handshake_send_res_err(QIOChannelWebsock *ioc,
const char *resdata)
{
char *date = qio_channel_websock_date_str();
qio_channel_websock_handshake_send_res(ioc, resdata, date);
g_free(date);
}
enum {
QIO_CHANNEL_WEBSOCK_STATUS_NORMAL = 1000,
QIO_CHANNEL_WEBSOCK_STATUS_PROTOCOL_ERR = 1002,
QIO_CHANNEL_WEBSOCK_STATUS_INVALID_DATA = 1003,
QIO_CHANNEL_WEBSOCK_STATUS_POLICY = 1008,
QIO_CHANNEL_WEBSOCK_STATUS_TOO_LARGE = 1009,
QIO_CHANNEL_WEBSOCK_STATUS_SERVER_ERR = 1011,
};
static size_t
qio_channel_websock_extract_headers(QIOChannelWebsock *ioc,
char *buffer,
QIOChannelWebsockHTTPHeader *hdrs,
size_t nhdrsalloc,
Error **errp)
{
char *nl, *sep, *tmp;
size_t nhdrs = 0;
/*
* First parse the HTTP protocol greeting of format:
*
* $METHOD $PATH $VERSION
*
* e.g.
*
* GET / HTTP/1.1
*/
nl = strstr(buffer, QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM);
if (!nl) {
error_setg(errp, "Missing HTTP header delimiter");
goto bad_request;
}
*nl = '\0';
trace_qio_channel_websock_http_greeting(ioc, buffer);
tmp = strchr(buffer, ' ');
if (!tmp) {
error_setg(errp, "Missing HTTP path delimiter");
return 0;
}
*tmp = '\0';
if (!g_str_equal(buffer, QIO_CHANNEL_WEBSOCK_HTTP_METHOD)) {
error_setg(errp, "Unsupported HTTP method %s", buffer);
goto bad_request;
}
buffer = tmp + 1;
tmp = strchr(buffer, ' ');
if (!tmp) {
error_setg(errp, "Missing HTTP version delimiter");
goto bad_request;
}
*tmp = '\0';
if (!g_str_equal(buffer, QIO_CHANNEL_WEBSOCK_HTTP_PATH)) {
qio_channel_websock_handshake_send_res_err(
ioc, QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_NOT_FOUND);
error_setg(errp, "Unexpected HTTP path %s", buffer);
return 0;
}
buffer = tmp + 1;
if (!g_str_equal(buffer, QIO_CHANNEL_WEBSOCK_HTTP_VERSION)) {
error_setg(errp, "Unsupported HTTP version %s", buffer);
goto bad_request;
}
buffer = nl + strlen(QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM);
/*
* Now parse all the header fields of format
*
* $NAME: $VALUE
*
* e.g.
*
* Cache-control: no-cache
*/
do {
QIOChannelWebsockHTTPHeader *hdr;
nl = strstr(buffer, QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM);
if (nl) {
*nl = '\0';
}
sep = strchr(buffer, ':');
if (!sep) {
error_setg(errp, "Malformed HTTP header");
goto bad_request;
}
*sep = '\0';
sep++;
while (*sep == ' ') {
sep++;
}
if (nhdrs >= nhdrsalloc) {
error_setg(errp, "Too many HTTP headers");
goto bad_request;
}
hdr = &hdrs[nhdrs++];
hdr->name = buffer;
hdr->value = sep;
/* Canonicalize header name for easier identification later */
for (tmp = hdr->name; *tmp; tmp++) {
*tmp = g_ascii_tolower(*tmp);
}
if (nl) {
buffer = nl + strlen(QIO_CHANNEL_WEBSOCK_HANDSHAKE_DELIM);
}
} while (nl != NULL);
return nhdrs;
bad_request:
qio_channel_websock_handshake_send_res_err(
ioc, QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_BAD_REQUEST);
return 0;
}
static const char *
qio_channel_websock_find_header(QIOChannelWebsockHTTPHeader *hdrs,
size_t nhdrs,
const char *name)
{
size_t i;
for (i = 0; i < nhdrs; i++) {
if (g_str_equal(hdrs[i].name, name)) {
return hdrs[i].value;
}
}
return NULL;
}
static void qio_channel_websock_handshake_send_res_ok(QIOChannelWebsock *ioc,
const char *key,
Error **errp)
{
char combined_key[QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN +
QIO_CHANNEL_WEBSOCK_GUID_LEN + 1];
char *accept = NULL;
char *date = NULL;
g_strlcpy(combined_key, key, QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN + 1);
g_strlcat(combined_key, QIO_CHANNEL_WEBSOCK_GUID,
QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN +
QIO_CHANNEL_WEBSOCK_GUID_LEN + 1);
/* hash and encode it */
if (qcrypto_hash_base64(QCRYPTO_HASH_ALG_SHA1,
combined_key,
QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN +
QIO_CHANNEL_WEBSOCK_GUID_LEN,
&accept,
errp) < 0) {
qio_channel_websock_handshake_send_res_err(
ioc, QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_SERVER_ERR);
return;
}
date = qio_channel_websock_date_str();
qio_channel_websock_handshake_send_res(
ioc, QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_OK, date, accept);
g_free(date);
g_free(accept);
}
static void qio_channel_websock_handshake_process(QIOChannelWebsock *ioc,
char *buffer,
Error **errp)
{
QIOChannelWebsockHTTPHeader hdrs[32];
size_t nhdrs = G_N_ELEMENTS(hdrs);
const char *protocols = NULL, *version = NULL, *key = NULL,
*host = NULL, *connection = NULL, *upgrade = NULL;
char **connectionv;
bool upgraded = false;
size_t i;
nhdrs = qio_channel_websock_extract_headers(ioc, buffer, hdrs, nhdrs, errp);
if (!nhdrs) {
return;
}
protocols = qio_channel_websock_find_header(
hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_PROTOCOL);
if (!protocols) {
error_setg(errp, "Missing websocket protocol header data");
goto bad_request;
}
version = qio_channel_websock_find_header(
hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_VERSION);
if (!version) {
error_setg(errp, "Missing websocket version header data");
goto bad_request;
}
key = qio_channel_websock_find_header(
hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_KEY);
if (!key) {
error_setg(errp, "Missing websocket key header data");
goto bad_request;
}
host = qio_channel_websock_find_header(
hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_HOST);
if (!host) {
error_setg(errp, "Missing websocket host header data");
goto bad_request;
}
connection = qio_channel_websock_find_header(
hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_CONNECTION);
if (!connection) {
error_setg(errp, "Missing websocket connection header data");
goto bad_request;
}
upgrade = qio_channel_websock_find_header(
hdrs, nhdrs, QIO_CHANNEL_WEBSOCK_HEADER_UPGRADE);
if (!upgrade) {
error_setg(errp, "Missing websocket upgrade header data");
goto bad_request;
}
trace_qio_channel_websock_http_request(ioc, protocols, version,
host, connection, upgrade, key);
if (!g_strrstr(protocols, QIO_CHANNEL_WEBSOCK_PROTOCOL_BINARY)) {
error_setg(errp, "No '%s' protocol is supported by client '%s'",
QIO_CHANNEL_WEBSOCK_PROTOCOL_BINARY, protocols);
goto bad_request;
}
if (!g_str_equal(version, QIO_CHANNEL_WEBSOCK_SUPPORTED_VERSION)) {
error_setg(errp, "Version '%s' is not supported by client '%s'",
QIO_CHANNEL_WEBSOCK_SUPPORTED_VERSION, version);
goto bad_request;
}
if (strlen(key) != QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN) {
error_setg(errp, "Key length '%zu' was not as expected '%d'",
strlen(key), QIO_CHANNEL_WEBSOCK_CLIENT_KEY_LEN);
goto bad_request;
}
connectionv = g_strsplit(connection, ",", 0);
for (i = 0; connectionv != NULL && connectionv[i] != NULL; i++) {
g_strstrip(connectionv[i]);
if (strcasecmp(connectionv[i],
QIO_CHANNEL_WEBSOCK_CONNECTION_UPGRADE) == 0) {
upgraded = true;
}
}
g_strfreev(connectionv);
if (!upgraded) {
error_setg(errp, "No connection upgrade requested '%s'", connection);
goto bad_request;
}
if (strcasecmp(upgrade, QIO_CHANNEL_WEBSOCK_UPGRADE_WEBSOCKET) != 0) {
error_setg(errp, "Incorrect upgrade method '%s'", upgrade);
goto bad_request;
}
qio_channel_websock_handshake_send_res_ok(ioc, key, errp);
return;
bad_request:
qio_channel_websock_handshake_send_res_err(
ioc, QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_BAD_REQUEST);
}
static int qio_channel_websock_handshake_read(QIOChannelWebsock *ioc,
Error **errp)
{
char *handshake_end;
ssize_t ret;
/* Typical HTTP headers from novnc are 512 bytes, so limiting
* total header size to 4096 is easily enough. */
size_t want = 4096 - ioc->encinput.offset;
buffer_reserve(&ioc->encinput, want);
ret = qio_channel_read(ioc->master,
(char *)buffer_end(&ioc->encinput), want, errp);
if (ret < 0) {
return -1;
}
ioc->encinput.offset += ret;
handshake_end = g_strstr_len((char *)ioc->encinput.buffer,
ioc->encinput.offset,
QIO_CHANNEL_WEBSOCK_HANDSHAKE_END);
if (!handshake_end) {
if (ioc->encinput.offset >= 4096) {
qio_channel_websock_handshake_send_res_err(
ioc, QIO_CHANNEL_WEBSOCK_HANDSHAKE_RES_TOO_LARGE);
error_setg(errp,
"End of headers not found in first 4096 bytes");
return 1;
} else if (ret == 0) {
error_setg(errp,
"End of headers not found before connection closed");
return -1;
}
return 0;
}
*handshake_end = '\0';
qio_channel_websock_handshake_process(ioc,
(char *)ioc->encinput.buffer,
errp);
buffer_advance(&ioc->encinput,
handshake_end - (char *)ioc->encinput.buffer +
strlen(QIO_CHANNEL_WEBSOCK_HANDSHAKE_END));
return 1;
}
static gboolean qio_channel_websock_handshake_send(QIOChannel *ioc,
GIOCondition condition,
gpointer user_data)
{
QIOTask *task = user_data;
QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(
qio_task_get_source(task));
Error *err = NULL;
ssize_t ret;
ret = qio_channel_write(wioc->master,
(char *)wioc->encoutput.buffer,
wioc->encoutput.offset,
&err);
if (ret < 0) {
trace_qio_channel_websock_handshake_fail(ioc, error_get_pretty(err));
qio_task_set_error(task, err);
qio_task_complete(task);
return FALSE;
}
buffer_advance(&wioc->encoutput, ret);
if (wioc->encoutput.offset == 0) {
if (wioc->io_err) {
trace_qio_channel_websock_handshake_fail(
ioc, error_get_pretty(wioc->io_err));
qio_task_set_error(task, wioc->io_err);
wioc->io_err = NULL;
qio_task_complete(task);
} else {
trace_qio_channel_websock_handshake_complete(ioc);
qio_task_complete(task);
}
return FALSE;
}
trace_qio_channel_websock_handshake_pending(ioc, G_IO_OUT);
return TRUE;
}
static gboolean qio_channel_websock_handshake_io(QIOChannel *ioc,
GIOCondition condition,
gpointer user_data)
{
QIOTask *task = user_data;
QIOChannelWebsock *wioc = QIO_CHANNEL_WEBSOCK(
qio_task_get_source(task));
Error *err = NULL;
int ret;
ret = qio_channel_websock_handshake_read(wioc, &err);
if (ret < 0) {
/*
* We only take this path on a fatal I/O error reading from
* client connection, as most of the time we have an
* HTTP 4xx err response to send instead
*/
trace_qio_channel_websock_handshake_fail(ioc, error_get_pretty(err));
qio_task_set_error(task, err);
qio_task_complete(task);
return FALSE;
}
if (ret == 0) {
trace_qio_channel_websock_handshake_pending(ioc, G_IO_IN);
/* need more data still */
return TRUE;
}
if (err) {
error_propagate(&wioc->io_err, err);
}
trace_qio_channel_websock_handshake_reply(ioc);
qio_channel_add_watch(
wioc->master,
G_IO_OUT,
qio_channel_websock_handshake_send,
task,
NULL);
return FALSE;
}
static void qio_channel_websock_encode(QIOChannelWebsock *ioc,
uint8_t opcode,
const struct iovec *iov,
size_t niov,
size_t size)
{
size_t header_size;
size_t i;
union {
char buf[QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT];
QIOChannelWebsockHeader ws;
} header;
assert(size <= iov_size(iov, niov));
header.ws.b0 = QIO_CHANNEL_WEBSOCK_HEADER_FIELD_FIN |
(opcode & QIO_CHANNEL_WEBSOCK_HEADER_FIELD_OPCODE);
if (size < QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_THRESHOLD_7_BIT) {
header.ws.b1 = (uint8_t)size;
header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_7_BIT;
} else if (size < QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_THRESHOLD_16_BIT) {
header.ws.b1 = QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_16_BIT;
header.ws.u.s16.l16 = cpu_to_be16((uint16_t)size);
header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_16_BIT;
} else {
header.ws.b1 = QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_64_BIT;
header.ws.u.s64.l64 = cpu_to_be64(size);
header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT;
}
header_size -= QIO_CHANNEL_WEBSOCK_HEADER_LEN_MASK;
trace_qio_channel_websock_encode(ioc, opcode, header_size, size);
buffer_reserve(&ioc->encoutput, header_size + size);
buffer_append(&ioc->encoutput, header.buf, header_size);
for (i = 0; i < niov && size != 0; i++) {
size_t want = iov[i].iov_len;
if (want > size) {
want = size;
}
buffer_append(&ioc->encoutput, iov[i].iov_base, want);
size -= want;
}
}
static ssize_t qio_channel_websock_write_wire(QIOChannelWebsock *, Error **);
static void qio_channel_websock_write_close(QIOChannelWebsock *ioc,
uint16_t code, const char *reason)
{
struct iovec iov[2] = {
{ .iov_base = &code, .iov_len = sizeof(code) },
};
size_t niov = 1;
size_t size = iov[0].iov_len;
cpu_to_be16s(&code);
if (reason) {
iov[1].iov_base = (void *)reason;
iov[1].iov_len = strlen(reason);
size += iov[1].iov_len;
niov++;
}
qio_channel_websock_encode(ioc, QIO_CHANNEL_WEBSOCK_OPCODE_CLOSE,
iov, niov, size);
qio_channel_websock_write_wire(ioc, NULL);
qio_channel_shutdown(ioc->master, QIO_CHANNEL_SHUTDOWN_BOTH, NULL);
}
static int qio_channel_websock_decode_header(QIOChannelWebsock *ioc,
Error **errp)
{
unsigned char opcode, fin, has_mask;
size_t header_size;
size_t payload_len;
QIOChannelWebsockHeader *header =
(QIOChannelWebsockHeader *)ioc->encinput.buffer;
if (ioc->payload_remain) {
error_setg(errp,
"Decoding header but %zu bytes of payload remain",
ioc->payload_remain);
qio_channel_websock_write_close(
ioc, QIO_CHANNEL_WEBSOCK_STATUS_SERVER_ERR,
"internal server error");
return -1;
}
if (ioc->encinput.offset < QIO_CHANNEL_WEBSOCK_HEADER_LEN_7_BIT) {
/* header not complete */
return QIO_CHANNEL_ERR_BLOCK;
}
fin = header->b0 & QIO_CHANNEL_WEBSOCK_HEADER_FIELD_FIN;
opcode = header->b0 & QIO_CHANNEL_WEBSOCK_HEADER_FIELD_OPCODE;
has_mask = header->b1 & QIO_CHANNEL_WEBSOCK_HEADER_FIELD_HAS_MASK;
payload_len = header->b1 & QIO_CHANNEL_WEBSOCK_HEADER_FIELD_PAYLOAD_LEN;
/* Save or restore opcode. */
if (opcode) {
ioc->opcode = opcode;
} else {
opcode = ioc->opcode;
}
trace_qio_channel_websock_header_partial_decode(ioc, payload_len,
fin, opcode, (int)has_mask);
if (opcode == QIO_CHANNEL_WEBSOCK_OPCODE_CLOSE) {
/* disconnect */
return 0;
}
/* Websocket frame sanity check:
* * Fragmentation is only supported for binary frames.
* * All frames sent by a client MUST be masked.
* * Only binary and ping/pong encoding is supported.
*/
if (!fin) {
if (opcode != QIO_CHANNEL_WEBSOCK_OPCODE_BINARY_FRAME) {
error_setg(errp, "only binary websocket frames may be fragmented");
qio_channel_websock_write_close(
ioc, QIO_CHANNEL_WEBSOCK_STATUS_POLICY ,
"only binary frames may be fragmented");
return -1;
}
} else {
if (opcode != QIO_CHANNEL_WEBSOCK_OPCODE_BINARY_FRAME &&
opcode != QIO_CHANNEL_WEBSOCK_OPCODE_CLOSE &&
opcode != QIO_CHANNEL_WEBSOCK_OPCODE_PING &&
opcode != QIO_CHANNEL_WEBSOCK_OPCODE_PONG) {
error_setg(errp, "unsupported opcode: %#04x; only binary, close, "
"ping, and pong websocket frames are supported", opcode);
qio_channel_websock_write_close(
ioc, QIO_CHANNEL_WEBSOCK_STATUS_INVALID_DATA ,
"only binary, close, ping, and pong frames are supported");
return -1;
}
}
if (!has_mask) {
error_setg(errp, "client websocket frames must be masked");
qio_channel_websock_write_close(
ioc, QIO_CHANNEL_WEBSOCK_STATUS_PROTOCOL_ERR,
"client frames must be masked");
return -1;
}
if (payload_len < QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_16_BIT) {
ioc->payload_remain = payload_len;
header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_7_BIT;
ioc->mask = header->u.m;
} else if (opcode & QIO_CHANNEL_WEBSOCK_CONTROL_OPCODE_MASK) {
error_setg(errp, "websocket control frame is too large");
qio_channel_websock_write_close(
ioc, QIO_CHANNEL_WEBSOCK_STATUS_PROTOCOL_ERR,
"control frame is too large");
return -1;
} else if (payload_len == QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_16_BIT &&
ioc->encinput.offset >= QIO_CHANNEL_WEBSOCK_HEADER_LEN_16_BIT) {
ioc->payload_remain = be16_to_cpu(header->u.s16.l16);
header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_16_BIT;
ioc->mask = header->u.s16.m16;
} else if (payload_len == QIO_CHANNEL_WEBSOCK_PAYLOAD_LEN_MAGIC_64_BIT &&
ioc->encinput.offset >= QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT) {
ioc->payload_remain = be64_to_cpu(header->u.s64.l64);
header_size = QIO_CHANNEL_WEBSOCK_HEADER_LEN_64_BIT;
ioc->mask = header->u.s64.m64;
} else {
/* header not complete */
return QIO_CHANNEL_ERR_BLOCK;
}
trace_qio_channel_websock_header_full_decode(
ioc, header_size, ioc->payload_remain, ioc->mask.u);
buffer_advance(&ioc->encinput, header_size);
return 0;
}
static int qio_channel_websock_decode_payload(QIOChannelWebsock *ioc,
Error **errp)
{
size_t i;
size_t payload_len = 0;
uint32_t *payload32;
if (ioc->payload_remain) {
/* If we aren't at the end of the payload, then drop
* off the last bytes, so we're always multiple of 4
* for purpose of unmasking, except at end of payload
*/
if (ioc->encinput.offset < ioc->payload_remain) {
/* Wait for the entire payload before processing control frames
* because the payload will most likely be echoed back. */
if (ioc->opcode & QIO_CHANNEL_WEBSOCK_CONTROL_OPCODE_MASK) {
return QIO_CHANNEL_ERR_BLOCK;
}
payload_len = ioc->encinput.offset - (ioc->encinput.offset % 4);
} else {
payload_len = ioc->payload_remain;
}
if (payload_len == 0) {
return QIO_CHANNEL_ERR_BLOCK;
}
ioc->payload_remain -= payload_len;
/* unmask frame */
/* process 1 frame (32 bit op) */
payload32 = (uint32_t *)ioc->encinput.buffer;
for (i = 0; i < payload_len / 4; i++) {
payload32[i] ^= ioc->mask.u;
}
/* process the remaining bytes (if any) */
for (i *= 4; i < payload_len; i++) {
ioc->encinput.buffer[i] ^= ioc->mask.c[i % 4];
}
}
trace_qio_channel_websock_payload_decode(
ioc, ioc->opcode, ioc->payload_remain);
if (ioc->opcode == QIO_CHANNEL_WEBSOCK_OPCODE_BINARY_FRAME) {
if (payload_len) {
/* binary frames are passed on */
buffer_reserve(&ioc->rawinput, payload_len);
buffer_append(&ioc->rawinput, ioc->encinput.buffer, payload_len);
}
} else if (ioc->opcode == QIO_CHANNEL_WEBSOCK_OPCODE_CLOSE) {
/* close frames are echoed back */
error_setg(errp, "websocket closed by peer");
if (payload_len) {
/* echo client status */
struct iovec iov = { .iov_base = ioc->encinput.buffer,
.iov_len = ioc->encinput.offset };
qio_channel_websock_encode(ioc, QIO_CHANNEL_WEBSOCK_OPCODE_CLOSE,
&iov, 1, iov.iov_len);
qio_channel_websock_write_wire(ioc, NULL);
qio_channel_shutdown(ioc->master, QIO_CHANNEL_SHUTDOWN_BOTH, NULL);
} else {
/* send our own status */
qio_channel_websock_write_close(
ioc, QIO_CHANNEL_WEBSOCK_STATUS_NORMAL, "peer requested close");
}
return -1;
} else if (ioc->opcode == QIO_CHANNEL_WEBSOCK_OPCODE_PING) {
/* ping frames produce an immediate reply, as long as we've not still
* got a previous pong queued, in which case we drop the new pong */
if (ioc->pong_remain == 0) {
struct iovec iov = { .iov_base = ioc->encinput.buffer,
.iov_len = ioc->encinput.offset };
qio_channel_websock_encode(ioc, QIO_CHANNEL_WEBSOCK_OPCODE_PONG,
&iov, 1, iov.iov_len);
ioc->pong_remain = ioc->encoutput.offset;
}
} /* pong frames are ignored */
if (payload_len) {
buffer_advance(&ioc->encinput, payload_len);
}
return 0;
}
QIOChannelWebsock *
qio_channel_websock_new_server(QIOChannel *master)
{
QIOChannelWebsock *wioc;
QIOChannel *ioc;
wioc = QIO_CHANNEL_WEBSOCK(object_new(TYPE_QIO_CHANNEL_WEBSOCK));
ioc = QIO_CHANNEL(wioc);
wioc->master = master;
if (qio_channel_has_feature(master, QIO_CHANNEL_FEATURE_SHUTDOWN)) {
qio_channel_set_feature(ioc, QIO_CHANNEL_FEATURE_SHUTDOWN);
}
object_ref(OBJECT(master));
trace_qio_channel_websock_new_server(wioc, master);
return wioc;
}
void qio_channel_websock_handshake(QIOChannelWebsock *ioc,
QIOTaskFunc func,
gpointer opaque,
GDestroyNotify destroy)
{
QIOTask *task;
task = qio_task_new(OBJECT(ioc),
func,
opaque,
destroy);
trace_qio_channel_websock_handshake_start(ioc);
trace_qio_channel_websock_handshake_pending(ioc, G_IO_IN);
qio_channel_add_watch(ioc->master,
G_IO_IN,
qio_channel_websock_handshake_io,
task,
NULL);
}
static void qio_channel_websock_finalize(Object *obj)
{
QIOChannelWebsock *ioc = QIO_CHANNEL_WEBSOCK(obj);
buffer_free(&ioc->encinput);
buffer_free(&ioc->encoutput);
buffer_free(&ioc->rawinput);
object_unref(OBJECT(ioc->master));
if (ioc->io_tag) {
g_source_remove(ioc->io_tag);
}
if (ioc->io_err) {
error_free(ioc->io_err);
}
}
static ssize_t qio_channel_websock_read_wire(QIOChannelWebsock *ioc,
Error **errp)
{
ssize_t ret;
if (ioc->encinput.offset < 4096) {
size_t want = 4096 - ioc->encinput.offset;
buffer_reserve(&ioc->encinput, want);
ret = qio_channel_read(ioc->master,
(char *)ioc->encinput.buffer +
ioc->encinput.offset,
want,
errp);
if (ret < 0) {
return ret;
}
if (ret == 0 && ioc->encinput.offset == 0) {
ioc->io_eof = TRUE;
return 0;
}
ioc->encinput.offset += ret;
}
while (ioc->encinput.offset != 0) {
if (ioc->payload_remain == 0) {
ret = qio_channel_websock_decode_header(ioc, errp);
if (ret < 0) {
return ret;
}
}
ret = qio_channel_websock_decode_payload(ioc, errp);
if (ret < 0) {
return ret;
}
}
return 1;
}
static ssize_t qio_channel_websock_write_wire(QIOChannelWebsock *ioc,
Error **errp)
{
ssize_t ret;
ssize_t done = 0;
while (ioc->encoutput.offset > 0) {
ret = qio_channel_write(ioc->master,
(char *)ioc->encoutput.buffer,
ioc->encoutput.offset,
errp);
if (ret < 0) {
if (ret == QIO_CHANNEL_ERR_BLOCK &&
done > 0) {
return done;
} else {
return ret;
}
}
buffer_advance(&ioc->encoutput, ret);
done += ret;
if (ioc->pong_remain < ret) {
ioc->pong_remain = 0;
} else {
ioc->pong_remain -= ret;
}
}
return done;
}
static void qio_channel_websock_flush_free(gpointer user_data)