1 | /* |
2 | * Copyright 1999-2017 The OpenSSL Project Authors. All Rights Reserved. |
3 | * |
4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
5 | * this file except in compliance with the License. You can obtain a copy |
6 | * in the file LICENSE in the source distribution or at |
7 | * https://www.openssl.org/source/license.html |
8 | */ |
9 | |
10 | /* |
11 | * Special method for a BIO where the other endpoint is also a BIO of this |
12 | * kind, handled by the same thread (i.e. the "peer" is actually ourselves, |
13 | * wearing a different hat). Such "BIO pairs" are mainly for using the SSL |
14 | * library with I/O interfaces for which no specific BIO method is available. |
15 | * See ssl/ssltest.c for some hints on how this can be used. |
16 | */ |
17 | |
18 | #include "e_os.h" |
19 | #include <assert.h> |
20 | #include <limits.h> |
21 | #include <stdlib.h> |
22 | #include <string.h> |
23 | |
24 | #include "bio_local.h" |
25 | #include <openssl/err.h> |
26 | #include <openssl/crypto.h> |
27 | |
28 | static int bio_new(BIO *bio); |
29 | static int bio_free(BIO *bio); |
30 | static int bio_read(BIO *bio, char *buf, int size); |
31 | static int bio_write(BIO *bio, const char *buf, int num); |
32 | static long bio_ctrl(BIO *bio, int cmd, long num, void *ptr); |
33 | static int bio_puts(BIO *bio, const char *str); |
34 | |
35 | static int bio_make_pair(BIO *bio1, BIO *bio2); |
36 | static void bio_destroy_pair(BIO *bio); |
37 | |
38 | static const BIO_METHOD methods_biop = { |
39 | BIO_TYPE_BIO, |
40 | "BIO pair" , |
41 | /* TODO: Convert to new style write function */ |
42 | bwrite_conv, |
43 | bio_write, |
44 | /* TODO: Convert to new style read function */ |
45 | bread_conv, |
46 | bio_read, |
47 | bio_puts, |
48 | NULL /* no bio_gets */ , |
49 | bio_ctrl, |
50 | bio_new, |
51 | bio_free, |
52 | NULL /* no bio_callback_ctrl */ |
53 | }; |
54 | |
55 | const BIO_METHOD *BIO_s_bio(void) |
56 | { |
57 | return &methods_biop; |
58 | } |
59 | |
60 | struct bio_bio_st { |
61 | BIO *peer; /* NULL if buf == NULL. If peer != NULL, then |
62 | * peer->ptr is also a bio_bio_st, and its |
63 | * "peer" member points back to us. peer != |
64 | * NULL iff init != 0 in the BIO. */ |
65 | /* This is for what we write (i.e. reading uses peer's struct): */ |
66 | int closed; /* valid iff peer != NULL */ |
67 | size_t len; /* valid iff buf != NULL; 0 if peer == NULL */ |
68 | size_t offset; /* valid iff buf != NULL; 0 if len == 0 */ |
69 | size_t size; |
70 | char *buf; /* "size" elements (if != NULL) */ |
71 | size_t request; /* valid iff peer != NULL; 0 if len != 0, |
72 | * otherwise set by peer to number of bytes |
73 | * it (unsuccessfully) tried to read, never |
74 | * more than buffer space (size-len) |
75 | * warrants. */ |
76 | }; |
77 | |
78 | static int bio_new(BIO *bio) |
79 | { |
80 | struct bio_bio_st *b = OPENSSL_zalloc(sizeof(*b)); |
81 | |
82 | if (b == NULL) |
83 | return 0; |
84 | |
85 | /* enough for one TLS record (just a default) */ |
86 | b->size = 17 * 1024; |
87 | |
88 | bio->ptr = b; |
89 | return 1; |
90 | } |
91 | |
92 | static int bio_free(BIO *bio) |
93 | { |
94 | struct bio_bio_st *b; |
95 | |
96 | if (bio == NULL) |
97 | return 0; |
98 | b = bio->ptr; |
99 | |
100 | assert(b != NULL); |
101 | |
102 | if (b->peer) |
103 | bio_destroy_pair(bio); |
104 | |
105 | OPENSSL_free(b->buf); |
106 | OPENSSL_free(b); |
107 | |
108 | return 1; |
109 | } |
110 | |
111 | static int bio_read(BIO *bio, char *buf, int size_) |
112 | { |
113 | size_t size = size_; |
114 | size_t rest; |
115 | struct bio_bio_st *b, *peer_b; |
116 | |
117 | BIO_clear_retry_flags(bio); |
118 | |
119 | if (!bio->init) |
120 | return 0; |
121 | |
122 | b = bio->ptr; |
123 | assert(b != NULL); |
124 | assert(b->peer != NULL); |
125 | peer_b = b->peer->ptr; |
126 | assert(peer_b != NULL); |
127 | assert(peer_b->buf != NULL); |
128 | |
129 | peer_b->request = 0; /* will be set in "retry_read" situation */ |
130 | |
131 | if (buf == NULL || size == 0) |
132 | return 0; |
133 | |
134 | if (peer_b->len == 0) { |
135 | if (peer_b->closed) |
136 | return 0; /* writer has closed, and no data is left */ |
137 | else { |
138 | BIO_set_retry_read(bio); /* buffer is empty */ |
139 | if (size <= peer_b->size) |
140 | peer_b->request = size; |
141 | else |
142 | /* |
143 | * don't ask for more than the peer can deliver in one write |
144 | */ |
145 | peer_b->request = peer_b->size; |
146 | return -1; |
147 | } |
148 | } |
149 | |
150 | /* we can read */ |
151 | if (peer_b->len < size) |
152 | size = peer_b->len; |
153 | |
154 | /* now read "size" bytes */ |
155 | |
156 | rest = size; |
157 | |
158 | assert(rest > 0); |
159 | do { /* one or two iterations */ |
160 | size_t chunk; |
161 | |
162 | assert(rest <= peer_b->len); |
163 | if (peer_b->offset + rest <= peer_b->size) |
164 | chunk = rest; |
165 | else |
166 | /* wrap around ring buffer */ |
167 | chunk = peer_b->size - peer_b->offset; |
168 | assert(peer_b->offset + chunk <= peer_b->size); |
169 | |
170 | memcpy(buf, peer_b->buf + peer_b->offset, chunk); |
171 | |
172 | peer_b->len -= chunk; |
173 | if (peer_b->len) { |
174 | peer_b->offset += chunk; |
175 | assert(peer_b->offset <= peer_b->size); |
176 | if (peer_b->offset == peer_b->size) |
177 | peer_b->offset = 0; |
178 | buf += chunk; |
179 | } else { |
180 | /* buffer now empty, no need to advance "buf" */ |
181 | assert(chunk == rest); |
182 | peer_b->offset = 0; |
183 | } |
184 | rest -= chunk; |
185 | } |
186 | while (rest); |
187 | |
188 | return size; |
189 | } |
190 | |
191 | /*- |
192 | * non-copying interface: provide pointer to available data in buffer |
193 | * bio_nread0: return number of available bytes |
194 | * bio_nread: also advance index |
195 | * (example usage: bio_nread0(), read from buffer, bio_nread() |
196 | * or just bio_nread(), read from buffer) |
197 | */ |
198 | /* |
199 | * WARNING: The non-copying interface is largely untested as of yet and may |
200 | * contain bugs. |
201 | */ |
202 | static ossl_ssize_t bio_nread0(BIO *bio, char **buf) |
203 | { |
204 | struct bio_bio_st *b, *peer_b; |
205 | ossl_ssize_t num; |
206 | |
207 | BIO_clear_retry_flags(bio); |
208 | |
209 | if (!bio->init) |
210 | return 0; |
211 | |
212 | b = bio->ptr; |
213 | assert(b != NULL); |
214 | assert(b->peer != NULL); |
215 | peer_b = b->peer->ptr; |
216 | assert(peer_b != NULL); |
217 | assert(peer_b->buf != NULL); |
218 | |
219 | peer_b->request = 0; |
220 | |
221 | if (peer_b->len == 0) { |
222 | char dummy; |
223 | |
224 | /* avoid code duplication -- nothing available for reading */ |
225 | return bio_read(bio, &dummy, 1); /* returns 0 or -1 */ |
226 | } |
227 | |
228 | num = peer_b->len; |
229 | if (peer_b->size < peer_b->offset + num) |
230 | /* no ring buffer wrap-around for non-copying interface */ |
231 | num = peer_b->size - peer_b->offset; |
232 | assert(num > 0); |
233 | |
234 | if (buf != NULL) |
235 | *buf = peer_b->buf + peer_b->offset; |
236 | return num; |
237 | } |
238 | |
239 | static ossl_ssize_t bio_nread(BIO *bio, char **buf, size_t num_) |
240 | { |
241 | struct bio_bio_st *b, *peer_b; |
242 | ossl_ssize_t num, available; |
243 | |
244 | if (num_ > OSSL_SSIZE_MAX) |
245 | num = OSSL_SSIZE_MAX; |
246 | else |
247 | num = (ossl_ssize_t) num_; |
248 | |
249 | available = bio_nread0(bio, buf); |
250 | if (num > available) |
251 | num = available; |
252 | if (num <= 0) |
253 | return num; |
254 | |
255 | b = bio->ptr; |
256 | peer_b = b->peer->ptr; |
257 | |
258 | peer_b->len -= num; |
259 | if (peer_b->len) { |
260 | peer_b->offset += num; |
261 | assert(peer_b->offset <= peer_b->size); |
262 | if (peer_b->offset == peer_b->size) |
263 | peer_b->offset = 0; |
264 | } else |
265 | peer_b->offset = 0; |
266 | |
267 | return num; |
268 | } |
269 | |
270 | static int bio_write(BIO *bio, const char *buf, int num_) |
271 | { |
272 | size_t num = num_; |
273 | size_t rest; |
274 | struct bio_bio_st *b; |
275 | |
276 | BIO_clear_retry_flags(bio); |
277 | |
278 | if (!bio->init || buf == NULL || num == 0) |
279 | return 0; |
280 | |
281 | b = bio->ptr; |
282 | assert(b != NULL); |
283 | assert(b->peer != NULL); |
284 | assert(b->buf != NULL); |
285 | |
286 | b->request = 0; |
287 | if (b->closed) { |
288 | /* we already closed */ |
289 | BIOerr(BIO_F_BIO_WRITE, BIO_R_BROKEN_PIPE); |
290 | return -1; |
291 | } |
292 | |
293 | assert(b->len <= b->size); |
294 | |
295 | if (b->len == b->size) { |
296 | BIO_set_retry_write(bio); /* buffer is full */ |
297 | return -1; |
298 | } |
299 | |
300 | /* we can write */ |
301 | if (num > b->size - b->len) |
302 | num = b->size - b->len; |
303 | |
304 | /* now write "num" bytes */ |
305 | |
306 | rest = num; |
307 | |
308 | assert(rest > 0); |
309 | do { /* one or two iterations */ |
310 | size_t write_offset; |
311 | size_t chunk; |
312 | |
313 | assert(b->len + rest <= b->size); |
314 | |
315 | write_offset = b->offset + b->len; |
316 | if (write_offset >= b->size) |
317 | write_offset -= b->size; |
318 | /* b->buf[write_offset] is the first byte we can write to. */ |
319 | |
320 | if (write_offset + rest <= b->size) |
321 | chunk = rest; |
322 | else |
323 | /* wrap around ring buffer */ |
324 | chunk = b->size - write_offset; |
325 | |
326 | memcpy(b->buf + write_offset, buf, chunk); |
327 | |
328 | b->len += chunk; |
329 | |
330 | assert(b->len <= b->size); |
331 | |
332 | rest -= chunk; |
333 | buf += chunk; |
334 | } |
335 | while (rest); |
336 | |
337 | return num; |
338 | } |
339 | |
340 | /*- |
341 | * non-copying interface: provide pointer to region to write to |
342 | * bio_nwrite0: check how much space is available |
343 | * bio_nwrite: also increase length |
344 | * (example usage: bio_nwrite0(), write to buffer, bio_nwrite() |
345 | * or just bio_nwrite(), write to buffer) |
346 | */ |
347 | static ossl_ssize_t bio_nwrite0(BIO *bio, char **buf) |
348 | { |
349 | struct bio_bio_st *b; |
350 | size_t num; |
351 | size_t write_offset; |
352 | |
353 | BIO_clear_retry_flags(bio); |
354 | |
355 | if (!bio->init) |
356 | return 0; |
357 | |
358 | b = bio->ptr; |
359 | assert(b != NULL); |
360 | assert(b->peer != NULL); |
361 | assert(b->buf != NULL); |
362 | |
363 | b->request = 0; |
364 | if (b->closed) { |
365 | BIOerr(BIO_F_BIO_NWRITE0, BIO_R_BROKEN_PIPE); |
366 | return -1; |
367 | } |
368 | |
369 | assert(b->len <= b->size); |
370 | |
371 | if (b->len == b->size) { |
372 | BIO_set_retry_write(bio); |
373 | return -1; |
374 | } |
375 | |
376 | num = b->size - b->len; |
377 | write_offset = b->offset + b->len; |
378 | if (write_offset >= b->size) |
379 | write_offset -= b->size; |
380 | if (write_offset + num > b->size) |
381 | /* |
382 | * no ring buffer wrap-around for non-copying interface (to fulfil |
383 | * the promise by BIO_ctrl_get_write_guarantee, BIO_nwrite may have |
384 | * to be called twice) |
385 | */ |
386 | num = b->size - write_offset; |
387 | |
388 | if (buf != NULL) |
389 | *buf = b->buf + write_offset; |
390 | assert(write_offset + num <= b->size); |
391 | |
392 | return num; |
393 | } |
394 | |
395 | static ossl_ssize_t bio_nwrite(BIO *bio, char **buf, size_t num_) |
396 | { |
397 | struct bio_bio_st *b; |
398 | ossl_ssize_t num, space; |
399 | |
400 | if (num_ > OSSL_SSIZE_MAX) |
401 | num = OSSL_SSIZE_MAX; |
402 | else |
403 | num = (ossl_ssize_t) num_; |
404 | |
405 | space = bio_nwrite0(bio, buf); |
406 | if (num > space) |
407 | num = space; |
408 | if (num <= 0) |
409 | return num; |
410 | b = bio->ptr; |
411 | assert(b != NULL); |
412 | b->len += num; |
413 | assert(b->len <= b->size); |
414 | |
415 | return num; |
416 | } |
417 | |
418 | static long bio_ctrl(BIO *bio, int cmd, long num, void *ptr) |
419 | { |
420 | long ret; |
421 | struct bio_bio_st *b = bio->ptr; |
422 | |
423 | assert(b != NULL); |
424 | |
425 | switch (cmd) { |
426 | /* specific CTRL codes */ |
427 | |
428 | case BIO_C_SET_WRITE_BUF_SIZE: |
429 | if (b->peer) { |
430 | BIOerr(BIO_F_BIO_CTRL, BIO_R_IN_USE); |
431 | ret = 0; |
432 | } else if (num == 0) { |
433 | BIOerr(BIO_F_BIO_CTRL, BIO_R_INVALID_ARGUMENT); |
434 | ret = 0; |
435 | } else { |
436 | size_t new_size = num; |
437 | |
438 | if (b->size != new_size) { |
439 | OPENSSL_free(b->buf); |
440 | b->buf = NULL; |
441 | b->size = new_size; |
442 | } |
443 | ret = 1; |
444 | } |
445 | break; |
446 | |
447 | case BIO_C_GET_WRITE_BUF_SIZE: |
448 | ret = (long)b->size; |
449 | break; |
450 | |
451 | case BIO_C_MAKE_BIO_PAIR: |
452 | { |
453 | BIO *other_bio = ptr; |
454 | |
455 | if (bio_make_pair(bio, other_bio)) |
456 | ret = 1; |
457 | else |
458 | ret = 0; |
459 | } |
460 | break; |
461 | |
462 | case BIO_C_DESTROY_BIO_PAIR: |
463 | /* |
464 | * Affects both BIOs in the pair -- call just once! Or let |
465 | * BIO_free(bio1); BIO_free(bio2); do the job. |
466 | */ |
467 | bio_destroy_pair(bio); |
468 | ret = 1; |
469 | break; |
470 | |
471 | case BIO_C_GET_WRITE_GUARANTEE: |
472 | /* |
473 | * How many bytes can the caller feed to the next write without |
474 | * having to keep any? |
475 | */ |
476 | if (b->peer == NULL || b->closed) |
477 | ret = 0; |
478 | else |
479 | ret = (long)b->size - b->len; |
480 | break; |
481 | |
482 | case BIO_C_GET_READ_REQUEST: |
483 | /* |
484 | * If the peer unsuccessfully tried to read, how many bytes were |
485 | * requested? (As with BIO_CTRL_PENDING, that number can usually be |
486 | * treated as boolean.) |
487 | */ |
488 | ret = (long)b->request; |
489 | break; |
490 | |
491 | case BIO_C_RESET_READ_REQUEST: |
492 | /* |
493 | * Reset request. (Can be useful after read attempts at the other |
494 | * side that are meant to be non-blocking, e.g. when probing SSL_read |
495 | * to see if any data is available.) |
496 | */ |
497 | b->request = 0; |
498 | ret = 1; |
499 | break; |
500 | |
501 | case BIO_C_SHUTDOWN_WR: |
502 | /* similar to shutdown(..., SHUT_WR) */ |
503 | b->closed = 1; |
504 | ret = 1; |
505 | break; |
506 | |
507 | case BIO_C_NREAD0: |
508 | /* prepare for non-copying read */ |
509 | ret = (long)bio_nread0(bio, ptr); |
510 | break; |
511 | |
512 | case BIO_C_NREAD: |
513 | /* non-copying read */ |
514 | ret = (long)bio_nread(bio, ptr, (size_t)num); |
515 | break; |
516 | |
517 | case BIO_C_NWRITE0: |
518 | /* prepare for non-copying write */ |
519 | ret = (long)bio_nwrite0(bio, ptr); |
520 | break; |
521 | |
522 | case BIO_C_NWRITE: |
523 | /* non-copying write */ |
524 | ret = (long)bio_nwrite(bio, ptr, (size_t)num); |
525 | break; |
526 | |
527 | /* standard CTRL codes follow */ |
528 | |
529 | case BIO_CTRL_RESET: |
530 | if (b->buf != NULL) { |
531 | b->len = 0; |
532 | b->offset = 0; |
533 | } |
534 | ret = 0; |
535 | break; |
536 | |
537 | case BIO_CTRL_GET_CLOSE: |
538 | ret = bio->shutdown; |
539 | break; |
540 | |
541 | case BIO_CTRL_SET_CLOSE: |
542 | bio->shutdown = (int)num; |
543 | ret = 1; |
544 | break; |
545 | |
546 | case BIO_CTRL_PENDING: |
547 | if (b->peer != NULL) { |
548 | struct bio_bio_st *peer_b = b->peer->ptr; |
549 | |
550 | ret = (long)peer_b->len; |
551 | } else |
552 | ret = 0; |
553 | break; |
554 | |
555 | case BIO_CTRL_WPENDING: |
556 | if (b->buf != NULL) |
557 | ret = (long)b->len; |
558 | else |
559 | ret = 0; |
560 | break; |
561 | |
562 | case BIO_CTRL_DUP: |
563 | /* See BIO_dup_chain for circumstances we have to expect. */ |
564 | { |
565 | BIO *other_bio = ptr; |
566 | struct bio_bio_st *other_b; |
567 | |
568 | assert(other_bio != NULL); |
569 | other_b = other_bio->ptr; |
570 | assert(other_b != NULL); |
571 | |
572 | assert(other_b->buf == NULL); /* other_bio is always fresh */ |
573 | |
574 | other_b->size = b->size; |
575 | } |
576 | |
577 | ret = 1; |
578 | break; |
579 | |
580 | case BIO_CTRL_FLUSH: |
581 | ret = 1; |
582 | break; |
583 | |
584 | case BIO_CTRL_EOF: |
585 | if (b->peer != NULL) { |
586 | struct bio_bio_st *peer_b = b->peer->ptr; |
587 | |
588 | if (peer_b->len == 0 && peer_b->closed) |
589 | ret = 1; |
590 | else |
591 | ret = 0; |
592 | } else { |
593 | ret = 1; |
594 | } |
595 | break; |
596 | |
597 | default: |
598 | ret = 0; |
599 | } |
600 | return ret; |
601 | } |
602 | |
603 | static int bio_puts(BIO *bio, const char *str) |
604 | { |
605 | return bio_write(bio, str, strlen(str)); |
606 | } |
607 | |
608 | static int bio_make_pair(BIO *bio1, BIO *bio2) |
609 | { |
610 | struct bio_bio_st *b1, *b2; |
611 | |
612 | assert(bio1 != NULL); |
613 | assert(bio2 != NULL); |
614 | |
615 | b1 = bio1->ptr; |
616 | b2 = bio2->ptr; |
617 | |
618 | if (b1->peer != NULL || b2->peer != NULL) { |
619 | BIOerr(BIO_F_BIO_MAKE_PAIR, BIO_R_IN_USE); |
620 | return 0; |
621 | } |
622 | |
623 | if (b1->buf == NULL) { |
624 | b1->buf = OPENSSL_malloc(b1->size); |
625 | if (b1->buf == NULL) { |
626 | BIOerr(BIO_F_BIO_MAKE_PAIR, ERR_R_MALLOC_FAILURE); |
627 | return 0; |
628 | } |
629 | b1->len = 0; |
630 | b1->offset = 0; |
631 | } |
632 | |
633 | if (b2->buf == NULL) { |
634 | b2->buf = OPENSSL_malloc(b2->size); |
635 | if (b2->buf == NULL) { |
636 | BIOerr(BIO_F_BIO_MAKE_PAIR, ERR_R_MALLOC_FAILURE); |
637 | return 0; |
638 | } |
639 | b2->len = 0; |
640 | b2->offset = 0; |
641 | } |
642 | |
643 | b1->peer = bio2; |
644 | b1->closed = 0; |
645 | b1->request = 0; |
646 | b2->peer = bio1; |
647 | b2->closed = 0; |
648 | b2->request = 0; |
649 | |
650 | bio1->init = 1; |
651 | bio2->init = 1; |
652 | |
653 | return 1; |
654 | } |
655 | |
656 | static void bio_destroy_pair(BIO *bio) |
657 | { |
658 | struct bio_bio_st *b = bio->ptr; |
659 | |
660 | if (b != NULL) { |
661 | BIO *peer_bio = b->peer; |
662 | |
663 | if (peer_bio != NULL) { |
664 | struct bio_bio_st *peer_b = peer_bio->ptr; |
665 | |
666 | assert(peer_b != NULL); |
667 | assert(peer_b->peer == bio); |
668 | |
669 | peer_b->peer = NULL; |
670 | peer_bio->init = 0; |
671 | assert(peer_b->buf != NULL); |
672 | peer_b->len = 0; |
673 | peer_b->offset = 0; |
674 | |
675 | b->peer = NULL; |
676 | bio->init = 0; |
677 | assert(b->buf != NULL); |
678 | b->len = 0; |
679 | b->offset = 0; |
680 | } |
681 | } |
682 | } |
683 | |
684 | /* Exported convenience functions */ |
685 | int BIO_new_bio_pair(BIO **bio1_p, size_t writebuf1, |
686 | BIO **bio2_p, size_t writebuf2) |
687 | { |
688 | BIO *bio1 = NULL, *bio2 = NULL; |
689 | long r; |
690 | int ret = 0; |
691 | |
692 | bio1 = BIO_new(BIO_s_bio()); |
693 | if (bio1 == NULL) |
694 | goto err; |
695 | bio2 = BIO_new(BIO_s_bio()); |
696 | if (bio2 == NULL) |
697 | goto err; |
698 | |
699 | if (writebuf1) { |
700 | r = BIO_set_write_buf_size(bio1, writebuf1); |
701 | if (!r) |
702 | goto err; |
703 | } |
704 | if (writebuf2) { |
705 | r = BIO_set_write_buf_size(bio2, writebuf2); |
706 | if (!r) |
707 | goto err; |
708 | } |
709 | |
710 | r = BIO_make_bio_pair(bio1, bio2); |
711 | if (!r) |
712 | goto err; |
713 | ret = 1; |
714 | |
715 | err: |
716 | if (ret == 0) { |
717 | BIO_free(bio1); |
718 | bio1 = NULL; |
719 | BIO_free(bio2); |
720 | bio2 = NULL; |
721 | } |
722 | |
723 | *bio1_p = bio1; |
724 | *bio2_p = bio2; |
725 | return ret; |
726 | } |
727 | |
728 | size_t BIO_ctrl_get_write_guarantee(BIO *bio) |
729 | { |
730 | return BIO_ctrl(bio, BIO_C_GET_WRITE_GUARANTEE, 0, NULL); |
731 | } |
732 | |
733 | size_t BIO_ctrl_get_read_request(BIO *bio) |
734 | { |
735 | return BIO_ctrl(bio, BIO_C_GET_READ_REQUEST, 0, NULL); |
736 | } |
737 | |
738 | int BIO_ctrl_reset_read_request(BIO *bio) |
739 | { |
740 | return (BIO_ctrl(bio, BIO_C_RESET_READ_REQUEST, 0, NULL) != 0); |
741 | } |
742 | |
743 | /* |
744 | * BIO_nread0/nread/nwrite0/nwrite are available only for BIO pairs for now |
745 | * (conceivably some other BIOs could allow non-copying reads and writes |
746 | * too.) |
747 | */ |
748 | int BIO_nread0(BIO *bio, char **buf) |
749 | { |
750 | long ret; |
751 | |
752 | if (!bio->init) { |
753 | BIOerr(BIO_F_BIO_NREAD0, BIO_R_UNINITIALIZED); |
754 | return -2; |
755 | } |
756 | |
757 | ret = BIO_ctrl(bio, BIO_C_NREAD0, 0, buf); |
758 | if (ret > INT_MAX) |
759 | return INT_MAX; |
760 | else |
761 | return (int)ret; |
762 | } |
763 | |
764 | int BIO_nread(BIO *bio, char **buf, int num) |
765 | { |
766 | int ret; |
767 | |
768 | if (!bio->init) { |
769 | BIOerr(BIO_F_BIO_NREAD, BIO_R_UNINITIALIZED); |
770 | return -2; |
771 | } |
772 | |
773 | ret = (int)BIO_ctrl(bio, BIO_C_NREAD, num, buf); |
774 | if (ret > 0) |
775 | bio->num_read += ret; |
776 | return ret; |
777 | } |
778 | |
779 | int BIO_nwrite0(BIO *bio, char **buf) |
780 | { |
781 | long ret; |
782 | |
783 | if (!bio->init) { |
784 | BIOerr(BIO_F_BIO_NWRITE0, BIO_R_UNINITIALIZED); |
785 | return -2; |
786 | } |
787 | |
788 | ret = BIO_ctrl(bio, BIO_C_NWRITE0, 0, buf); |
789 | if (ret > INT_MAX) |
790 | return INT_MAX; |
791 | else |
792 | return (int)ret; |
793 | } |
794 | |
795 | int BIO_nwrite(BIO *bio, char **buf, int num) |
796 | { |
797 | int ret; |
798 | |
799 | if (!bio->init) { |
800 | BIOerr(BIO_F_BIO_NWRITE, BIO_R_UNINITIALIZED); |
801 | return -2; |
802 | } |
803 | |
804 | ret = BIO_ctrl(bio, BIO_C_NWRITE, num, buf); |
805 | if (ret > 0) |
806 | bio->num_write += ret; |
807 | return ret; |
808 | } |
809 | |