1 /* crypto/bio/bss_bio.c */
2 /* ====================================================================
3 * Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the
15 * distribution.
16 *
17 * 3. All advertising materials mentioning features or use of this
18 * software must display the following acknowledgment:
19 * "This product includes software developed by the OpenSSL Project
20 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
21 *
22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23 * endorse or promote products derived from this software without
24 * prior written permission. For written permission, please contact
25 * openssl-core@openssl.org.
26 *
27 * 5. Products derived from this software may not be called "OpenSSL"
28 * nor may "OpenSSL" appear in their names without prior written
29 * permission of the OpenSSL Project.
30 *
31 * 6. Redistributions of any form whatsoever must retain the following
32 * acknowledgment:
33 * "This product includes software developed by the OpenSSL Project
34 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
35 *
36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47 * OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
49 *
50 * This product includes cryptographic software written by Eric Young
51 * (eay@cryptsoft.com). This product includes software written by Tim
52 * Hudson (tjh@cryptsoft.com).
53 *
54 */
55
56 /*
57 * Special method for a BIO where the other endpoint is also a BIO of this
58 * kind, handled by the same thread (i.e. the "peer" is actually ourselves,
59 * wearing a different hat). Such "BIO pairs" are mainly for using the SSL
60 * library with I/O interfaces for which no specific BIO method is available.
61 * See ssl/ssltest.c for some hints on how this can be used.
62 */
63
64 /* BIO_DEBUG implies BIO_PAIR_DEBUG */
65 #ifdef BIO_DEBUG
66 # ifndef BIO_PAIR_DEBUG
67 # define BIO_PAIR_DEBUG
68 # endif
69 #endif
70
71 /* disable assert() unless BIO_PAIR_DEBUG has been defined */
72 #ifndef BIO_PAIR_DEBUG
73 # ifndef NDEBUG
74 # define NDEBUG
75 # endif
76 #endif
77
78 #include <assert.h>
79 #include <limits.h>
80 #include <stdlib.h>
81 #include <string.h>
82
83 #include <openssl/bio.h>
84 #include <openssl/err.h>
85 #include <openssl/crypto.h>
86
87 #include "e_os.h"
88
89 /* VxWorks defines SSIZE_MAX with an empty value causing compile errors */
90 #if defined(OPENSSL_SYS_VXWORKS)
91 # undef SSIZE_MAX
92 #endif
93 #ifndef SSIZE_MAX
94 # define SSIZE_MAX INT_MAX
95 #endif
96
97 static int bio_new(BIO *bio);
98 static int bio_free(BIO *bio);
99 static int bio_read(BIO *bio, char *buf, int size);
100 static int bio_write(BIO *bio, const char *buf, int num);
101 static long bio_ctrl(BIO *bio, int cmd, long num, void *ptr);
102 static int bio_puts(BIO *bio, const char *str);
103
104 static int bio_make_pair(BIO *bio1, BIO *bio2);
105 static void bio_destroy_pair(BIO *bio);
106
107 static BIO_METHOD methods_biop = {
108 BIO_TYPE_BIO,
109 "BIO pair",
110 bio_write,
111 bio_read,
112 bio_puts,
113 NULL /* no bio_gets */ ,
114 bio_ctrl,
115 bio_new,
116 bio_free,
117 NULL /* no bio_callback_ctrl */
118 };
119
BIO_s_bio(void)120 BIO_METHOD *BIO_s_bio(void)
121 {
122 return &methods_biop;
123 }
124
125 struct bio_bio_st {
126 BIO *peer; /* NULL if buf == NULL. If peer != NULL, then
127 * peer->ptr is also a bio_bio_st, and its
128 * "peer" member points back to us. peer !=
129 * NULL iff init != 0 in the BIO. */
130 /* This is for what we write (i.e. reading uses peer's struct): */
131 int closed; /* valid iff peer != NULL */
132 size_t len; /* valid iff buf != NULL; 0 if peer == NULL */
133 size_t offset; /* valid iff buf != NULL; 0 if len == 0 */
134 size_t size;
135 char *buf; /* "size" elements (if != NULL) */
136 size_t request; /* valid iff peer != NULL; 0 if len != 0,
137 * otherwise set by peer to number of bytes
138 * it (unsuccessfully) tried to read, never
139 * more than buffer space (size-len)
140 * warrants. */
141 };
142
bio_new(BIO * bio)143 static int bio_new(BIO *bio)
144 {
145 struct bio_bio_st *b;
146
147 b = OPENSSL_malloc(sizeof(*b));
148 if (b == NULL)
149 return 0;
150
151 b->peer = NULL;
152 b->closed = 0;
153 b->len = 0;
154 b->offset = 0;
155 /* enough for one TLS record (just a default) */
156 b->size = 17 * 1024;
157 b->buf = NULL;
158 b->request = 0;
159
160 bio->ptr = b;
161 return 1;
162 }
163
bio_free(BIO * bio)164 static int bio_free(BIO *bio)
165 {
166 struct bio_bio_st *b;
167
168 if (bio == NULL)
169 return 0;
170 b = bio->ptr;
171
172 assert(b != NULL);
173
174 if (b->peer)
175 bio_destroy_pair(bio);
176
177 if (b->buf != NULL) {
178 OPENSSL_free(b->buf);
179 }
180
181 OPENSSL_free(b);
182
183 return 1;
184 }
185
bio_read(BIO * bio,char * buf,int size_)186 static int bio_read(BIO *bio, char *buf, int size_)
187 {
188 size_t size = size_;
189 size_t rest;
190 struct bio_bio_st *b, *peer_b;
191
192 BIO_clear_retry_flags(bio);
193
194 if (!bio->init)
195 return 0;
196
197 b = bio->ptr;
198 assert(b != NULL);
199 assert(b->peer != NULL);
200 peer_b = b->peer->ptr;
201 assert(peer_b != NULL);
202 assert(peer_b->buf != NULL);
203
204 peer_b->request = 0; /* will be set in "retry_read" situation */
205
206 if (buf == NULL || size == 0)
207 return 0;
208
209 if (peer_b->len == 0) {
210 if (peer_b->closed)
211 return 0; /* writer has closed, and no data is left */
212 else {
213 BIO_set_retry_read(bio); /* buffer is empty */
214 if (size <= peer_b->size)
215 peer_b->request = size;
216 else
217 /*
218 * don't ask for more than the peer can deliver in one write
219 */
220 peer_b->request = peer_b->size;
221 return -1;
222 }
223 }
224
225 /* we can read */
226 if (peer_b->len < size)
227 size = peer_b->len;
228
229 /* now read "size" bytes */
230
231 rest = size;
232
233 assert(rest > 0);
234 do { /* one or two iterations */
235 size_t chunk;
236
237 assert(rest <= peer_b->len);
238 if (peer_b->offset + rest <= peer_b->size)
239 chunk = rest;
240 else
241 /* wrap around ring buffer */
242 chunk = peer_b->size - peer_b->offset;
243 assert(peer_b->offset + chunk <= peer_b->size);
244
245 memcpy(buf, peer_b->buf + peer_b->offset, chunk);
246
247 peer_b->len -= chunk;
248 if (peer_b->len) {
249 peer_b->offset += chunk;
250 assert(peer_b->offset <= peer_b->size);
251 if (peer_b->offset == peer_b->size)
252 peer_b->offset = 0;
253 buf += chunk;
254 } else {
255 /* buffer now empty, no need to advance "buf" */
256 assert(chunk == rest);
257 peer_b->offset = 0;
258 }
259 rest -= chunk;
260 }
261 while (rest);
262
263 return size;
264 }
265
266 /*-
267 * non-copying interface: provide pointer to available data in buffer
268 * bio_nread0: return number of available bytes
269 * bio_nread: also advance index
270 * (example usage: bio_nread0(), read from buffer, bio_nread()
271 * or just bio_nread(), read from buffer)
272 */
273 /*
274 * WARNING: The non-copying interface is largely untested as of yet and may
275 * contain bugs.
276 */
bio_nread0(BIO * bio,char ** buf)277 static ossl_ssize_t bio_nread0(BIO *bio, char **buf)
278 {
279 struct bio_bio_st *b, *peer_b;
280 ossl_ssize_t num;
281
282 BIO_clear_retry_flags(bio);
283
284 if (!bio->init)
285 return 0;
286
287 b = bio->ptr;
288 assert(b != NULL);
289 assert(b->peer != NULL);
290 peer_b = b->peer->ptr;
291 assert(peer_b != NULL);
292 assert(peer_b->buf != NULL);
293
294 peer_b->request = 0;
295
296 if (peer_b->len == 0) {
297 char dummy;
298
299 /* avoid code duplication -- nothing available for reading */
300 return bio_read(bio, &dummy, 1); /* returns 0 or -1 */
301 }
302
303 num = peer_b->len;
304 if (peer_b->size < peer_b->offset + num)
305 /* no ring buffer wrap-around for non-copying interface */
306 num = peer_b->size - peer_b->offset;
307 assert(num > 0);
308
309 if (buf != NULL)
310 *buf = peer_b->buf + peer_b->offset;
311 return num;
312 }
313
bio_nread(BIO * bio,char ** buf,size_t num_)314 static ossl_ssize_t bio_nread(BIO *bio, char **buf, size_t num_)
315 {
316 struct bio_bio_st *b, *peer_b;
317 ossl_ssize_t num, available;
318
319 if (num_ > SSIZE_MAX)
320 num = SSIZE_MAX;
321 else
322 num = (ossl_ssize_t) num_;
323
324 available = bio_nread0(bio, buf);
325 if (num > available)
326 num = available;
327 if (num <= 0)
328 return num;
329
330 b = bio->ptr;
331 peer_b = b->peer->ptr;
332
333 peer_b->len -= num;
334 if (peer_b->len) {
335 peer_b->offset += num;
336 assert(peer_b->offset <= peer_b->size);
337 if (peer_b->offset == peer_b->size)
338 peer_b->offset = 0;
339 } else
340 peer_b->offset = 0;
341
342 return num;
343 }
344
bio_write(BIO * bio,const char * buf,int num_)345 static int bio_write(BIO *bio, const char *buf, int num_)
346 {
347 size_t num = num_;
348 size_t rest;
349 struct bio_bio_st *b;
350
351 BIO_clear_retry_flags(bio);
352
353 if (!bio->init || buf == NULL || num == 0)
354 return 0;
355
356 b = bio->ptr;
357 assert(b != NULL);
358 assert(b->peer != NULL);
359 assert(b->buf != NULL);
360
361 b->request = 0;
362 if (b->closed) {
363 /* we already closed */
364 BIOerr(BIO_F_BIO_WRITE, BIO_R_BROKEN_PIPE);
365 return -1;
366 }
367
368 assert(b->len <= b->size);
369
370 if (b->len == b->size) {
371 BIO_set_retry_write(bio); /* buffer is full */
372 return -1;
373 }
374
375 /* we can write */
376 if (num > b->size - b->len)
377 num = b->size - b->len;
378
379 /* now write "num" bytes */
380
381 rest = num;
382
383 assert(rest > 0);
384 do { /* one or two iterations */
385 size_t write_offset;
386 size_t chunk;
387
388 assert(b->len + rest <= b->size);
389
390 write_offset = b->offset + b->len;
391 if (write_offset >= b->size)
392 write_offset -= b->size;
393 /* b->buf[write_offset] is the first byte we can write to. */
394
395 if (write_offset + rest <= b->size)
396 chunk = rest;
397 else
398 /* wrap around ring buffer */
399 chunk = b->size - write_offset;
400
401 memcpy(b->buf + write_offset, buf, chunk);
402
403 b->len += chunk;
404
405 assert(b->len <= b->size);
406
407 rest -= chunk;
408 buf += chunk;
409 }
410 while (rest);
411
412 return num;
413 }
414
415 /*-
416 * non-copying interface: provide pointer to region to write to
417 * bio_nwrite0: check how much space is available
418 * bio_nwrite: also increase length
419 * (example usage: bio_nwrite0(), write to buffer, bio_nwrite()
420 * or just bio_nwrite(), write to buffer)
421 */
bio_nwrite0(BIO * bio,char ** buf)422 static ossl_ssize_t bio_nwrite0(BIO *bio, char **buf)
423 {
424 struct bio_bio_st *b;
425 size_t num;
426 size_t write_offset;
427
428 BIO_clear_retry_flags(bio);
429
430 if (!bio->init)
431 return 0;
432
433 b = bio->ptr;
434 assert(b != NULL);
435 assert(b->peer != NULL);
436 assert(b->buf != NULL);
437
438 b->request = 0;
439 if (b->closed) {
440 BIOerr(BIO_F_BIO_NWRITE0, BIO_R_BROKEN_PIPE);
441 return -1;
442 }
443
444 assert(b->len <= b->size);
445
446 if (b->len == b->size) {
447 BIO_set_retry_write(bio);
448 return -1;
449 }
450
451 num = b->size - b->len;
452 write_offset = b->offset + b->len;
453 if (write_offset >= b->size)
454 write_offset -= b->size;
455 if (write_offset + num > b->size)
456 /*
457 * no ring buffer wrap-around for non-copying interface (to fulfil
458 * the promise by BIO_ctrl_get_write_guarantee, BIO_nwrite may have
459 * to be called twice)
460 */
461 num = b->size - write_offset;
462
463 if (buf != NULL)
464 *buf = b->buf + write_offset;
465 assert(write_offset + num <= b->size);
466
467 return num;
468 }
469
bio_nwrite(BIO * bio,char ** buf,size_t num_)470 static ossl_ssize_t bio_nwrite(BIO *bio, char **buf, size_t num_)
471 {
472 struct bio_bio_st *b;
473 ossl_ssize_t num, space;
474
475 if (num_ > SSIZE_MAX)
476 num = SSIZE_MAX;
477 else
478 num = (ossl_ssize_t) num_;
479
480 space = bio_nwrite0(bio, buf);
481 if (num > space)
482 num = space;
483 if (num <= 0)
484 return num;
485 b = bio->ptr;
486 assert(b != NULL);
487 b->len += num;
488 assert(b->len <= b->size);
489
490 return num;
491 }
492
bio_ctrl(BIO * bio,int cmd,long num,void * ptr)493 static long bio_ctrl(BIO *bio, int cmd, long num, void *ptr)
494 {
495 long ret;
496 struct bio_bio_st *b = bio->ptr;
497
498 assert(b != NULL);
499
500 switch (cmd) {
501 /* specific CTRL codes */
502
503 case BIO_C_SET_WRITE_BUF_SIZE:
504 if (b->peer) {
505 BIOerr(BIO_F_BIO_CTRL, BIO_R_IN_USE);
506 ret = 0;
507 } else if (num == 0) {
508 BIOerr(BIO_F_BIO_CTRL, BIO_R_INVALID_ARGUMENT);
509 ret = 0;
510 } else {
511 size_t new_size = num;
512
513 if (b->size != new_size) {
514 if (b->buf) {
515 OPENSSL_free(b->buf);
516 b->buf = NULL;
517 }
518 b->size = new_size;
519 }
520 ret = 1;
521 }
522 break;
523
524 case BIO_C_GET_WRITE_BUF_SIZE:
525 ret = (long)b->size;
526 break;
527
528 case BIO_C_MAKE_BIO_PAIR:
529 {
530 BIO *other_bio = ptr;
531
532 if (bio_make_pair(bio, other_bio))
533 ret = 1;
534 else
535 ret = 0;
536 }
537 break;
538
539 case BIO_C_DESTROY_BIO_PAIR:
540 /*
541 * Affects both BIOs in the pair -- call just once! Or let
542 * BIO_free(bio1); BIO_free(bio2); do the job.
543 */
544 bio_destroy_pair(bio);
545 ret = 1;
546 break;
547
548 case BIO_C_GET_WRITE_GUARANTEE:
549 /*
550 * How many bytes can the caller feed to the next write without
551 * having to keep any?
552 */
553 if (b->peer == NULL || b->closed)
554 ret = 0;
555 else
556 ret = (long)b->size - b->len;
557 break;
558
559 case BIO_C_GET_READ_REQUEST:
560 /*
561 * If the peer unsuccessfully tried to read, how many bytes were
562 * requested? (As with BIO_CTRL_PENDING, that number can usually be
563 * treated as boolean.)
564 */
565 ret = (long)b->request;
566 break;
567
568 case BIO_C_RESET_READ_REQUEST:
569 /*
570 * Reset request. (Can be useful after read attempts at the other
571 * side that are meant to be non-blocking, e.g. when probing SSL_read
572 * to see if any data is available.)
573 */
574 b->request = 0;
575 ret = 1;
576 break;
577
578 case BIO_C_SHUTDOWN_WR:
579 /* similar to shutdown(..., SHUT_WR) */
580 b->closed = 1;
581 ret = 1;
582 break;
583
584 case BIO_C_NREAD0:
585 /* prepare for non-copying read */
586 ret = (long)bio_nread0(bio, ptr);
587 break;
588
589 case BIO_C_NREAD:
590 /* non-copying read */
591 ret = (long)bio_nread(bio, ptr, (size_t)num);
592 break;
593
594 case BIO_C_NWRITE0:
595 /* prepare for non-copying write */
596 ret = (long)bio_nwrite0(bio, ptr);
597 break;
598
599 case BIO_C_NWRITE:
600 /* non-copying write */
601 ret = (long)bio_nwrite(bio, ptr, (size_t)num);
602 break;
603
604 /* standard CTRL codes follow */
605
606 case BIO_CTRL_RESET:
607 if (b->buf != NULL) {
608 b->len = 0;
609 b->offset = 0;
610 }
611 ret = 0;
612 break;
613
614 case BIO_CTRL_GET_CLOSE:
615 ret = bio->shutdown;
616 break;
617
618 case BIO_CTRL_SET_CLOSE:
619 bio->shutdown = (int)num;
620 ret = 1;
621 break;
622
623 case BIO_CTRL_PENDING:
624 if (b->peer != NULL) {
625 struct bio_bio_st *peer_b = b->peer->ptr;
626
627 ret = (long)peer_b->len;
628 } else
629 ret = 0;
630 break;
631
632 case BIO_CTRL_WPENDING:
633 if (b->buf != NULL)
634 ret = (long)b->len;
635 else
636 ret = 0;
637 break;
638
639 case BIO_CTRL_DUP:
640 /* See BIO_dup_chain for circumstances we have to expect. */
641 {
642 BIO *other_bio = ptr;
643 struct bio_bio_st *other_b;
644
645 assert(other_bio != NULL);
646 other_b = other_bio->ptr;
647 assert(other_b != NULL);
648
649 assert(other_b->buf == NULL); /* other_bio is always fresh */
650
651 other_b->size = b->size;
652 }
653
654 ret = 1;
655 break;
656
657 case BIO_CTRL_FLUSH:
658 ret = 1;
659 break;
660
661 case BIO_CTRL_EOF:
662 if (b->peer != NULL) {
663 struct bio_bio_st *peer_b = b->peer->ptr;
664
665 if (peer_b->len == 0 && peer_b->closed)
666 ret = 1;
667 else
668 ret = 0;
669 } else {
670 ret = 1;
671 }
672 break;
673
674 default:
675 ret = 0;
676 }
677 return ret;
678 }
679
bio_puts(BIO * bio,const char * str)680 static int bio_puts(BIO *bio, const char *str)
681 {
682 return bio_write(bio, str, strlen(str));
683 }
684
bio_make_pair(BIO * bio1,BIO * bio2)685 static int bio_make_pair(BIO *bio1, BIO *bio2)
686 {
687 struct bio_bio_st *b1, *b2;
688
689 assert(bio1 != NULL);
690 assert(bio2 != NULL);
691
692 b1 = bio1->ptr;
693 b2 = bio2->ptr;
694
695 if (b1->peer != NULL || b2->peer != NULL) {
696 BIOerr(BIO_F_BIO_MAKE_PAIR, BIO_R_IN_USE);
697 return 0;
698 }
699
700 if (b1->buf == NULL) {
701 b1->buf = OPENSSL_malloc(b1->size);
702 if (b1->buf == NULL) {
703 BIOerr(BIO_F_BIO_MAKE_PAIR, ERR_R_MALLOC_FAILURE);
704 return 0;
705 }
706 b1->len = 0;
707 b1->offset = 0;
708 }
709
710 if (b2->buf == NULL) {
711 b2->buf = OPENSSL_malloc(b2->size);
712 if (b2->buf == NULL) {
713 BIOerr(BIO_F_BIO_MAKE_PAIR, ERR_R_MALLOC_FAILURE);
714 return 0;
715 }
716 b2->len = 0;
717 b2->offset = 0;
718 }
719
720 b1->peer = bio2;
721 b1->closed = 0;
722 b1->request = 0;
723 b2->peer = bio1;
724 b2->closed = 0;
725 b2->request = 0;
726
727 bio1->init = 1;
728 bio2->init = 1;
729
730 return 1;
731 }
732
bio_destroy_pair(BIO * bio)733 static void bio_destroy_pair(BIO *bio)
734 {
735 struct bio_bio_st *b = bio->ptr;
736
737 if (b != NULL) {
738 BIO *peer_bio = b->peer;
739
740 if (peer_bio != NULL) {
741 struct bio_bio_st *peer_b = peer_bio->ptr;
742
743 assert(peer_b != NULL);
744 assert(peer_b->peer == bio);
745
746 peer_b->peer = NULL;
747 peer_bio->init = 0;
748 assert(peer_b->buf != NULL);
749 peer_b->len = 0;
750 peer_b->offset = 0;
751
752 b->peer = NULL;
753 bio->init = 0;
754 assert(b->buf != NULL);
755 b->len = 0;
756 b->offset = 0;
757 }
758 }
759 }
760
761 /* Exported convenience functions */
BIO_new_bio_pair(BIO ** bio1_p,size_t writebuf1,BIO ** bio2_p,size_t writebuf2)762 int BIO_new_bio_pair(BIO **bio1_p, size_t writebuf1,
763 BIO **bio2_p, size_t writebuf2)
764 {
765 BIO *bio1 = NULL, *bio2 = NULL;
766 long r;
767 int ret = 0;
768
769 bio1 = BIO_new(BIO_s_bio());
770 if (bio1 == NULL)
771 goto err;
772 bio2 = BIO_new(BIO_s_bio());
773 if (bio2 == NULL)
774 goto err;
775
776 if (writebuf1) {
777 r = BIO_set_write_buf_size(bio1, writebuf1);
778 if (!r)
779 goto err;
780 }
781 if (writebuf2) {
782 r = BIO_set_write_buf_size(bio2, writebuf2);
783 if (!r)
784 goto err;
785 }
786
787 r = BIO_make_bio_pair(bio1, bio2);
788 if (!r)
789 goto err;
790 ret = 1;
791
792 err:
793 if (ret == 0) {
794 if (bio1) {
795 BIO_free(bio1);
796 bio1 = NULL;
797 }
798 if (bio2) {
799 BIO_free(bio2);
800 bio2 = NULL;
801 }
802 }
803
804 *bio1_p = bio1;
805 *bio2_p = bio2;
806 return ret;
807 }
808
BIO_ctrl_get_write_guarantee(BIO * bio)809 size_t BIO_ctrl_get_write_guarantee(BIO *bio)
810 {
811 return BIO_ctrl(bio, BIO_C_GET_WRITE_GUARANTEE, 0, NULL);
812 }
813
BIO_ctrl_get_read_request(BIO * bio)814 size_t BIO_ctrl_get_read_request(BIO *bio)
815 {
816 return BIO_ctrl(bio, BIO_C_GET_READ_REQUEST, 0, NULL);
817 }
818
BIO_ctrl_reset_read_request(BIO * bio)819 int BIO_ctrl_reset_read_request(BIO *bio)
820 {
821 return (BIO_ctrl(bio, BIO_C_RESET_READ_REQUEST, 0, NULL) != 0);
822 }
823
824 /*
825 * BIO_nread0/nread/nwrite0/nwrite are available only for BIO pairs for now
826 * (conceivably some other BIOs could allow non-copying reads and writes
827 * too.)
828 */
BIO_nread0(BIO * bio,char ** buf)829 int BIO_nread0(BIO *bio, char **buf)
830 {
831 long ret;
832
833 if (!bio->init) {
834 BIOerr(BIO_F_BIO_NREAD0, BIO_R_UNINITIALIZED);
835 return -2;
836 }
837
838 ret = BIO_ctrl(bio, BIO_C_NREAD0, 0, buf);
839 if (ret > INT_MAX)
840 return INT_MAX;
841 else
842 return (int)ret;
843 }
844
BIO_nread(BIO * bio,char ** buf,int num)845 int BIO_nread(BIO *bio, char **buf, int num)
846 {
847 int ret;
848
849 if (!bio->init) {
850 BIOerr(BIO_F_BIO_NREAD, BIO_R_UNINITIALIZED);
851 return -2;
852 }
853
854 ret = (int)BIO_ctrl(bio, BIO_C_NREAD, num, buf);
855 if (ret > 0)
856 bio->num_read += ret;
857 return ret;
858 }
859
BIO_nwrite0(BIO * bio,char ** buf)860 int BIO_nwrite0(BIO *bio, char **buf)
861 {
862 long ret;
863
864 if (!bio->init) {
865 BIOerr(BIO_F_BIO_NWRITE0, BIO_R_UNINITIALIZED);
866 return -2;
867 }
868
869 ret = BIO_ctrl(bio, BIO_C_NWRITE0, 0, buf);
870 if (ret > INT_MAX)
871 return INT_MAX;
872 else
873 return (int)ret;
874 }
875
BIO_nwrite(BIO * bio,char ** buf,int num)876 int BIO_nwrite(BIO *bio, char **buf, int num)
877 {
878 int ret;
879
880 if (!bio->init) {
881 BIOerr(BIO_F_BIO_NWRITE, BIO_R_UNINITIALIZED);
882 return -2;
883 }
884
885 ret = BIO_ctrl(bio, BIO_C_NWRITE, num, buf);
886 if (ret > 0)
887 bio->num_write += ret;
888 return ret;
889 }
890