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
|
/* ====================================================================
* Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com). */
#include <openssl/bio.h>
#include <assert.h>
#include <string.h>
#include <openssl/buf.h>
#include <openssl/err.h>
#include <openssl/mem.h>
struct bio_bio_st {
BIO *peer; /* NULL if buf == NULL.
* If peer != NULL, then peer->ptr is also a bio_bio_st,
* and its "peer" member points back to us.
* peer != NULL iff init != 0 in the BIO. */
/* This is for what we write (i.e. reading uses peer's struct): */
int closed; /* valid iff peer != NULL */
size_t len; /* valid iff buf != NULL; 0 if peer == NULL */
size_t offset; /* valid iff buf != NULL; 0 if len == 0 */
size_t size;
uint8_t *buf; /* "size" elements (if != NULL) */
char buf_externally_allocated; /* true iff buf was externally allocated. */
char zero_copy_read_lock; /* true iff a zero copy read operation
* is in progress. */
char zero_copy_write_lock; /* true iff a zero copy write operation
* is in progress. */
size_t request; /* valid iff peer != NULL; 0 if len != 0,
* otherwise set by peer to number of bytes
* it (unsuccessfully) tried to read,
* never more than buffer space (size-len) warrants. */
};
static int bio_new(BIO *bio) {
struct bio_bio_st *b;
b = OPENSSL_malloc(sizeof *b);
if (b == NULL) {
return 0;
}
memset(b, 0, sizeof(struct bio_bio_st));
b->size = 17 * 1024; /* enough for one TLS record (just a default) */
bio->ptr = b;
return 1;
}
static void bio_destroy_pair(BIO *bio) {
struct bio_bio_st *b = bio->ptr;
BIO *peer_bio;
struct bio_bio_st *peer_b;
if (b == NULL) {
return;
}
peer_bio = b->peer;
if (peer_bio == NULL) {
return;
}
peer_b = peer_bio->ptr;
assert(peer_b != NULL);
assert(peer_b->peer == bio);
peer_b->peer = NULL;
peer_bio->init = 0;
assert(peer_b->buf != NULL);
peer_b->len = 0;
peer_b->offset = 0;
b->peer = NULL;
bio->init = 0;
assert(b->buf != NULL);
b->len = 0;
b->offset = 0;
}
static int bio_free(BIO *bio) {
struct bio_bio_st *b;
if (bio == NULL) {
return 0;
}
b = bio->ptr;
assert(b != NULL);
if (b->peer) {
bio_destroy_pair(bio);
}
if (b->buf != NULL && !b->buf_externally_allocated) {
OPENSSL_free(b->buf);
}
OPENSSL_free(b);
return 1;
}
static size_t bio_zero_copy_get_read_buf(struct bio_bio_st* peer_b,
uint8_t** out_read_buf,
size_t* out_buf_offset) {
size_t max_available;
if (peer_b->len > peer_b->size - peer_b->offset) {
/* Only the first half of the ring buffer can be read. */
max_available = peer_b->size - peer_b->offset;
} else {
max_available = peer_b->len;
}
*out_read_buf = peer_b->buf;
*out_buf_offset = peer_b->offset;
return max_available;
}
int BIO_zero_copy_get_read_buf(BIO* bio, uint8_t** out_read_buf,
size_t* out_buf_offset,
size_t* out_available_bytes) {
struct bio_bio_st* b;
struct bio_bio_st* peer_b;
size_t max_available;
*out_available_bytes = 0;
BIO_clear_retry_flags(bio);
if (!bio->init) {
OPENSSL_PUT_ERROR(BIO, BIO_zero_copy_get_read_buf, BIO_R_UNINITIALIZED);
return 0;
}
b = bio->ptr;
if (!b || !b->peer) {
OPENSSL_PUT_ERROR(BIO, BIO_zero_copy_get_read_buf,
BIO_R_UNSUPPORTED_METHOD);
return 0;
}
peer_b = b->peer->ptr;
if (!peer_b || !peer_b->peer || peer_b->peer->ptr != b) {
OPENSSL_PUT_ERROR(BIO, BIO_zero_copy_get_read_buf,
BIO_R_UNSUPPORTED_METHOD);
return 0;
}
if (peer_b->zero_copy_read_lock) {
OPENSSL_PUT_ERROR(BIO, BIO_zero_copy_get_read_buf, BIO_R_INVALID_ARGUMENT);
return 0;
}
peer_b->request = 0; /* Is not used by zero-copy API. */
max_available =
bio_zero_copy_get_read_buf(peer_b, out_read_buf, out_buf_offset);
assert(peer_b->buf != NULL);
if (max_available > 0) {
peer_b->zero_copy_read_lock = 1;
}
*out_available_bytes = max_available;
return 1;
}
int BIO_zero_copy_get_read_buf_done(BIO* bio, size_t bytes_read) {
struct bio_bio_st* b;
struct bio_bio_st* peer_b;
size_t max_available;
size_t dummy_read_offset;
uint8_t* dummy_read_buf;
assert(BIO_get_retry_flags(bio) == 0);
if (!bio->init) {
OPENSSL_PUT_ERROR(BIO, BIO_zero_copy_get_read_buf_done,
BIO_R_UNINITIALIZED);
return 0;
}
b = bio->ptr;
if (!b || !b->peer) {
OPENSSL_PUT_ERROR(BIO, BIO_zero_copy_get_read_buf_done,
BIO_R_UNSUPPORTED_METHOD);
return 0;
}
peer_b = b->peer->ptr;
if (!peer_b || !peer_b->peer || peer_b->peer->ptr != b) {
OPENSSL_PUT_ERROR(BIO, BIO_zero_copy_get_read_buf_done,
BIO_R_UNSUPPORTED_METHOD);
return 0;
}
if (!peer_b->zero_copy_read_lock) {
OPENSSL_PUT_ERROR(BIO, BIO_zero_copy_get_read_buf_done,
BIO_R_INVALID_ARGUMENT);
return 0;
}
max_available =
bio_zero_copy_get_read_buf(peer_b, &dummy_read_buf, &dummy_read_offset);
if (bytes_read > max_available) {
OPENSSL_PUT_ERROR(BIO, BIO_zero_copy_get_read_buf_done,
BIO_R_INVALID_ARGUMENT);
return 0;
}
peer_b->len -= bytes_read;
assert(peer_b->len >= 0);
assert(peer_b->offset + bytes_read <= peer_b->size);
/* Move read offset. If zero_copy_write_lock == 1 we must advance the
* offset even if buffer becomes empty, to make sure
* write_offset = (offset + len) mod size does not change. */
if (peer_b->offset + bytes_read == peer_b->size ||
(!peer_b->zero_copy_write_lock && peer_b->len == 0)) {
peer_b->offset = 0;
} else {
peer_b->offset += bytes_read;
}
bio->num_read += bytes_read;
peer_b->zero_copy_read_lock = 0;
return 1;
}
static size_t bio_zero_copy_get_write_buf(struct bio_bio_st* b,
uint8_t** out_write_buf,
size_t* out_buf_offset) {
size_t write_offset;
size_t max_available;
assert(b->len <= b->size);
write_offset = b->offset + b->len;
if (write_offset >= b->size) {
/* Only the first half of the ring buffer can be written to. */
write_offset -= b->size;
/* write up to the start of the ring buffer. */
max_available = b->offset - write_offset;
} else {
/* write up to the end the buffer. */
max_available = b->size - write_offset;
}
*out_write_buf = b->buf;
*out_buf_offset = write_offset;
return max_available;
}
int BIO_zero_copy_get_write_buf(BIO* bio, uint8_t** out_write_buf,
size_t* out_buf_offset,
size_t* out_available_bytes) {
struct bio_bio_st* b;
struct bio_bio_st* peer_b;
size_t max_available;
*out_available_bytes = 0;
BIO_clear_retry_flags(bio);
if (!bio->init) {
OPENSSL_PUT_ERROR(BIO, BIO_zero_copy_get_write_buf, BIO_R_UNINITIALIZED);
return 0;
}
b = bio->ptr;
if (!b || !b->buf || !b->peer) {
OPENSSL_PUT_ERROR(BIO, BIO_zero_copy_get_write_buf,
BIO_R_UNSUPPORTED_METHOD);
return 0;
}
peer_b = b->peer->ptr;
if (!peer_b || !peer_b->peer || peer_b->peer->ptr != b) {
OPENSSL_PUT_ERROR(BIO, BIO_zero_copy_get_write_buf,
BIO_R_UNSUPPORTED_METHOD);
return 0;
}
assert(b->buf != NULL);
if (b->zero_copy_write_lock) {
OPENSSL_PUT_ERROR(BIO, BIO_zero_copy_get_write_buf, BIO_R_INVALID_ARGUMENT);
return 0;
}
b->request = 0;
if (b->closed) {
/* Bio is already closed. */
OPENSSL_PUT_ERROR(BIO, BIO_zero_copy_get_write_buf, BIO_R_BROKEN_PIPE);
return 0;
}
max_available = bio_zero_copy_get_write_buf(b, out_write_buf, out_buf_offset);
if (max_available > 0) {
b->zero_copy_write_lock = 1;
}
*out_available_bytes = max_available;
return 1;
}
int BIO_zero_copy_get_write_buf_done(BIO* bio, size_t bytes_written) {
struct bio_bio_st* b;
struct bio_bio_st* peer_b;
size_t rest;
size_t dummy_write_offset;
uint8_t* dummy_write_buf;
if (!bio->init) {
OPENSSL_PUT_ERROR(BIO, BIO_zero_copy_get_write_buf_done,
BIO_R_UNINITIALIZED);
return 0;
}
b = bio->ptr;
if (!b || !b->buf || !b->peer) {
OPENSSL_PUT_ERROR(BIO, BIO_zero_copy_get_write_buf_done,
BIO_R_UNSUPPORTED_METHOD);
return 0;
}
peer_b = b->peer->ptr;
if (!peer_b || !peer_b->peer || peer_b->peer->ptr != b) {
OPENSSL_PUT_ERROR(BIO, BIO_zero_copy_get_write_buf_done,
BIO_R_UNSUPPORTED_METHOD);
return 0;
}
b->request = 0;
if (b->closed) {
/* BIO is already closed. */
OPENSSL_PUT_ERROR(BIO, BIO_zero_copy_get_write_buf_done, BIO_R_BROKEN_PIPE);
return 0;
}
if (!b->zero_copy_write_lock) {
OPENSSL_PUT_ERROR(BIO, BIO_zero_copy_get_write_buf_done,
BIO_R_INVALID_ARGUMENT);
return 0;
}
rest = bio_zero_copy_get_write_buf(b, &dummy_write_buf, &dummy_write_offset);
if (bytes_written > rest) {
OPENSSL_PUT_ERROR(BIO, BIO_zero_copy_get_write_buf_done,
BIO_R_INVALID_ARGUMENT);
return 0;
}
bio->num_write += bytes_written;
/* Move write offset. */
b->len += bytes_written;
b->zero_copy_write_lock = 0;
return 1;
}
static int bio_read(BIO *bio, char *buf, int size_) {
size_t size = size_;
size_t rest;
struct bio_bio_st *b, *peer_b;
BIO_clear_retry_flags(bio);
if (!bio->init) {
return 0;
}
b = bio->ptr;
assert(b != NULL);
assert(b->peer != NULL);
peer_b = b->peer->ptr;
assert(peer_b != NULL);
assert(peer_b->buf != NULL);
peer_b->request = 0; /* will be set in "retry_read" situation */
if (buf == NULL || size == 0 || peer_b->zero_copy_read_lock) {
return 0;
}
if (peer_b->len == 0) {
if (peer_b->closed) {
return 0; /* writer has closed, and no data is left */
} else {
BIO_set_retry_read(bio); /* buffer is empty */
if (size <= peer_b->size) {
peer_b->request = size;
} else {
/* don't ask for more than the peer can
* deliver in one write */
peer_b->request = peer_b->size;
}
return -1;
}
}
/* we can read */
if (peer_b->len < size) {
size = peer_b->len;
}
/* now read "size" bytes */
rest = size;
assert(rest > 0);
/* one or two iterations */
do {
size_t chunk;
assert(rest <= peer_b->len);
if (peer_b->offset + rest <= peer_b->size) {
chunk = rest;
} else {
/* wrap around ring buffer */
chunk = peer_b->size - peer_b->offset;
}
assert(peer_b->offset + chunk <= peer_b->size);
memcpy(buf, peer_b->buf + peer_b->offset, chunk);
peer_b->len -= chunk;
/* If zero_copy_write_lock == 1 we must advance the offset even if buffer
* becomes empty, to make sure write_offset = (offset + len) % size
* does not change. */
if (peer_b->len || peer_b->zero_copy_write_lock) {
peer_b->offset += chunk;
assert(peer_b->offset <= peer_b->size);
if (peer_b->offset == peer_b->size) {
peer_b->offset = 0;
}
buf += chunk;
} else {
/* buffer now empty, no need to advance "buf" */
assert(chunk == rest);
peer_b->offset = 0;
}
rest -= chunk;
} while (rest);
return size;
}
static int bio_write(BIO *bio, const char *buf, int num_) {
size_t num = num_;
size_t rest;
struct bio_bio_st *b;
BIO_clear_retry_flags(bio);
if (!bio->init || buf == NULL || num == 0) {
return 0;
}
b = bio->ptr;
assert(b != NULL);
assert(b->peer != NULL);
assert(b->buf != NULL);
if (b->zero_copy_write_lock) {
return 0;
}
b->request = 0;
if (b->closed) {
/* we already closed */
OPENSSL_PUT_ERROR(BIO, bio_write, BIO_R_BROKEN_PIPE);
return -1;
}
assert(b->len <= b->size);
if (b->len == b->size) {
BIO_set_retry_write(bio); /* buffer is full */
return -1;
}
/* we can write */
if (num > b->size - b->len) {
num = b->size - b->len;
}
/* now write "num" bytes */
rest = num;
assert(rest > 0);
/* one or two iterations */
do {
size_t write_offset;
size_t chunk;
assert(b->len + rest <= b->size);
write_offset = b->offset + b->len;
if (write_offset >= b->size) {
write_offset -= b->size;
}
/* b->buf[write_offset] is the first byte we can write to. */
if (write_offset + rest <= b->size) {
chunk = rest;
} else {
/* wrap around ring buffer */
chunk = b->size - write_offset;
}
memcpy(b->buf + write_offset, buf, chunk);
b->len += chunk;
assert(b->len <= b->size);
rest -= chunk;
buf += chunk;
} while (rest);
return num;
}
static int bio_make_pair(BIO* bio1, BIO* bio2,
size_t writebuf1_len, uint8_t* ext_writebuf1,
size_t writebuf2_len, uint8_t* ext_writebuf2) {
struct bio_bio_st *b1, *b2;
assert(bio1 != NULL);
assert(bio2 != NULL);
b1 = bio1->ptr;
b2 = bio2->ptr;
if (b1->peer != NULL || b2->peer != NULL) {
OPENSSL_PUT_ERROR(BIO, bio_make_pair, BIO_R_IN_USE);
return 0;
}
assert(b1->buf_externally_allocated == 0);
assert(b2->buf_externally_allocated == 0);
if (b1->buf == NULL) {
if (writebuf1_len) {
b1->size = writebuf1_len;
}
if (!ext_writebuf1) {
b1->buf_externally_allocated = 0;
b1->buf = OPENSSL_malloc(b1->size);
if (b1->buf == NULL) {
OPENSSL_PUT_ERROR(BIO, bio_make_pair, ERR_R_MALLOC_FAILURE);
return 0;
}
} else {
b1->buf = ext_writebuf1;
b1->buf_externally_allocated = 1;
}
b1->len = 0;
b1->offset = 0;
}
if (b2->buf == NULL) {
if (writebuf2_len) {
b2->size = writebuf2_len;
}
if (!ext_writebuf2) {
b2->buf_externally_allocated = 0;
b2->buf = OPENSSL_malloc(b2->size);
if (b2->buf == NULL) {
OPENSSL_PUT_ERROR(BIO, bio_make_pair, ERR_R_MALLOC_FAILURE);
return 0;
}
} else {
b2->buf = ext_writebuf2;
b2->buf_externally_allocated = 1;
}
b2->len = 0;
b2->offset = 0;
}
b1->peer = bio2;
b1->closed = 0;
b1->request = 0;
b1->zero_copy_read_lock = 0;
b1->zero_copy_write_lock = 0;
b2->peer = bio1;
b2->closed = 0;
b2->request = 0;
b2->zero_copy_read_lock = 0;
b2->zero_copy_write_lock = 0;
bio1->init = 1;
bio2->init = 1;
return 1;
}
static long bio_ctrl(BIO *bio, int cmd, long num, void *ptr) {
long ret;
struct bio_bio_st *b = bio->ptr;
assert(b != NULL);
switch (cmd) {
/* specific CTRL codes */
case BIO_C_GET_WRITE_BUF_SIZE:
ret = (long)b->size;
break;
case BIO_C_GET_WRITE_GUARANTEE:
/* How many bytes can the caller feed to the next write
* without having to keep any? */
if (b->peer == NULL || b->closed) {
ret = 0;
} else {
ret = (long)b->size - b->len;
}
break;
case BIO_C_GET_READ_REQUEST:
/* If the peer unsuccessfully tried to read, how many bytes
* were requested? (As with BIO_CTRL_PENDING, that number
* can usually be treated as boolean.) */
ret = (long)b->request;
break;
case BIO_C_RESET_READ_REQUEST:
/* Reset request. (Can be useful after read attempts
* at the other side that are meant to be non-blocking,
* e.g. when probing SSL_read to see if any data is
* available.) */
b->request = 0;
ret = 1;
break;
case BIO_C_SHUTDOWN_WR:
/* similar to shutdown(..., SHUT_WR) */
b->closed = 1;
ret = 1;
break;
/* standard CTRL codes follow */
case BIO_CTRL_GET_CLOSE:
ret = bio->shutdown;
break;
case BIO_CTRL_SET_CLOSE:
bio->shutdown = (int)num;
ret = 1;
break;
case BIO_CTRL_PENDING:
if (b->peer != NULL) {
struct bio_bio_st *peer_b = b->peer->ptr;
ret = (long)peer_b->len;
} else {
ret = 0;
}
break;
case BIO_CTRL_WPENDING:
ret = 0;
if (b->buf != NULL) {
ret = (long)b->len;
}
break;
case BIO_CTRL_FLUSH:
ret = 1;
break;
case BIO_CTRL_EOF: {
BIO *other_bio = ptr;
if (other_bio) {
struct bio_bio_st *other_b = other_bio->ptr;
assert(other_b != NULL);
ret = other_b->len == 0 && other_b->closed;
} else {
ret = 1;
}
} break;
default:
ret = 0;
}
return ret;
}
static int bio_puts(BIO *bio, const char *str) {
return bio_write(bio, str, strlen(str));
}
static const BIO_METHOD methods_biop = {
BIO_TYPE_BIO, "BIO pair", bio_write, bio_read,
bio_puts, NULL /* no bio_gets */, bio_ctrl, bio_new,
bio_free, NULL /* no bio_callback_ctrl */
};
const BIO_METHOD *bio_s_bio(void) { return &methods_biop; }
int BIO_new_bio_pair(BIO** bio1_p, size_t writebuf1,
BIO** bio2_p, size_t writebuf2) {
return BIO_new_bio_pair_external_buf(bio1_p, writebuf1, NULL, bio2_p,
writebuf2, NULL);
}
int BIO_new_bio_pair_external_buf(BIO** bio1_p, size_t writebuf1_len,
uint8_t* ext_writebuf1,
BIO** bio2_p, size_t writebuf2_len,
uint8_t* ext_writebuf2) {
BIO *bio1 = NULL, *bio2 = NULL;
int ret = 0;
/* External buffers must have sizes greater than 0. */
if ((ext_writebuf1 && !writebuf1_len) || (ext_writebuf2 && !writebuf2_len)) {
goto err;
}
bio1 = BIO_new(bio_s_bio());
if (bio1 == NULL) {
goto err;
}
bio2 = BIO_new(bio_s_bio());
if (bio2 == NULL) {
goto err;
}
if (!bio_make_pair(bio1, bio2, writebuf1_len, ext_writebuf1, writebuf2_len,
ext_writebuf2)) {
goto err;
}
ret = 1;
err:
if (ret == 0) {
if (bio1) {
BIO_free(bio1);
bio1 = NULL;
}
if (bio2) {
BIO_free(bio2);
bio2 = NULL;
}
}
*bio1_p = bio1;
*bio2_p = bio2;
return ret;
}
size_t BIO_ctrl_get_read_request(BIO *bio) {
return BIO_ctrl(bio, BIO_C_GET_READ_REQUEST, 0, NULL);
}
size_t BIO_ctrl_get_write_guarantee(BIO *bio) {
return BIO_ctrl(bio, BIO_C_GET_WRITE_GUARANTEE, 0, NULL);
}
int BIO_shutdown_wr(BIO *bio) {
return BIO_ctrl(bio, BIO_C_SHUTDOWN_WR, 0, NULL);
}
|