1 /* crypto/bio/bss_bio.c  -*- Mode: C; c-file-style: "eay" -*- */

     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  © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

    57  */

    58 

    59 /* Special method for a BIO where the other endpoint is also a BIO

    60  * of this kind, handled by the same thread (i.e. the "peer" is actually

    61  * ourselves, wearing a different hat).

    62  * Such "BIO pairs" are mainly for using the SSL library with I/O interfaces

    63  * for which no specific BIO method is available.

    64  * See ssl/ssltest.c for some hints on how this can be used. */

    65 

    66 /* BIO_DEBUG implies BIO_PAIR_DEBUG */

    67 #ifdef BIO_DEBUG

    68 # ifndef BIO_PAIR_DEBUG

    69 #  define BIO_PAIR_DEBUG

    70 # endif

    71 #endif

    72 

    73 /* disable assert() unless BIO_PAIR_DEBUG has been defined */

    74 #ifndef BIO_PAIR_DEBUG

    75 # ifndef NDEBUG

    76 #  define NDEBUG

    77 # endif

    78 #endif

    79 

    80 #include <assert.h>

    81 #include <limits.h>

    82 #include <stdlib.h>

    83 #include <string.h>

    84 

    85 #include <openssl/bio.h>

    86 #include <openssl/err.h>

    87 #include <openssl/crypto.h>

    88 

    89 #include "e_os.h"

    90 #if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))

    91 #include "libcrypto_wsd_macros.h"

    92 #include "libcrypto_wsd.h"

    93 #endif

    94 

    95 /* VxWorks defines SSIZE_MAX with an empty value causing compile errors */

    96 #if defined(OPENSSL_SYS_VXWORKS)

    97 # undef SSIZE_MAX

    98 #endif

    99 #ifndef SSIZE_MAX

   100 # define SSIZE_MAX INT_MAX

   101 #endif

   102 

   103 static int bio_new(BIO *bio);

   104 static int bio_free(BIO *bio);

   105 static int bio_read(BIO *bio, char *buf, int size);

   106 static int bio_write(BIO *bio, const char *buf, int num);

   107 static long bio_ctrl(BIO *bio, int cmd, long num, void *ptr);

   108 static int bio_puts(BIO *bio, const char *str);

   109 

   110 static int bio_make_pair(BIO *bio1, BIO *bio2);

   111 static void bio_destroy_pair(BIO *bio);

   112 

   113 #ifndef EMULATOR

   114 static BIO_METHOD methods_biop =

   115 {

   116 	BIO_TYPE_BIO,

   117 	"BIO pair",

   118 	bio_write,

   119 	bio_read,

   120 	bio_puts,

   121 	NULL /* no bio_gets */,

   122 	bio_ctrl,

   123 	bio_new,

   124 	bio_free,

   125 	NULL /* no bio_callback_ctrl */

   126 };

   127 #else

   128 

   129 GET_STATIC_VAR_FROM_TLS(methods_biop,bss_bio,BIO_METHOD)

   130 #define methods_biop (*GET_WSD_VAR_NAME(methods_biop,bss_bio,s)())

   131 const BIO_METHOD temp_s_methods_biop =

   132 {

   133 	BIO_TYPE_BIO,

   134 	"BIO pair",

   135 	bio_write,

   136 	bio_read,

   137 	bio_puts,

   138 	NULL /* no bio_gets */,

   139 	bio_ctrl,

   140 	bio_new,

   141 	bio_free,

   142 	NULL /* no bio_callback_ctrl */

   143 };

   144 #endif	

   145 

   146 EXPORT_C BIO_METHOD *BIO_s_bio(void)

   147 	{

   148 	return &methods_biop;

   149 	}

   150 

   151 struct bio_bio_st

   152 {

   153 	BIO *peer;     /* NULL if buf == NULL.

   154 	                * If peer != NULL, then peer->ptr is also a bio_bio_st,

   155 	                * and its "peer" member points back to us.

   156 	                * peer != NULL iff init != 0 in the BIO. */

   157 	

   158 	/* This is for what we write (i.e. reading uses peer's struct): */

   159 	int closed;     /* valid iff peer != NULL */

   160 	size_t len;     /* valid iff buf != NULL; 0 if peer == NULL */

   161 	size_t offset;  /* valid iff buf != NULL; 0 if len == 0 */

   162 	size_t size;

   163 	char *buf;      /* "size" elements (if != NULL) */

   164 

   165 	size_t request; /* valid iff peer != NULL; 0 if len != 0,

   166 	                 * otherwise set by peer to number of bytes

   167 	                 * it (unsuccessfully) tried to read,

   168 	                 * never more than buffer space (size-len) warrants. */

   169 };

   170 

   171 static int bio_new(BIO *bio)

   172 	{

   173 	struct bio_bio_st *b;

   174 	

   175 	b = OPENSSL_malloc(sizeof *b);

   176 	if (b == NULL)

   177 		return 0;

   178 

   179 	b->peer = NULL;

   180 	b->size = 17*1024; /* enough for one TLS record (just a default) */

   181 	b->buf = NULL;

   182 

   183 	bio->ptr = b;

   184 	return 1;

   185 	}

   186 

   187 

   188 static int bio_free(BIO *bio)

   189 	{

   190 	struct bio_bio_st *b;

   191 

   192 	if (bio == NULL)

   193 		return 0;

   194 	b = bio->ptr;

   195 

   196 	assert(b != NULL);

   197 

   198 	if (b->peer)

   199 		bio_destroy_pair(bio);

   200 	

   201 	if (b->buf != NULL)

   202 		{

   203 		OPENSSL_free(b->buf);

   204 		}

   205 

   206 	OPENSSL_free(b);

   207 

   208 	return 1;

   209 	}

   210 

   211 

   212 

   213 static int bio_read(BIO *bio, char *buf, int size_)

   214 	{

   215 	size_t size = size_;

   216 	size_t rest;

   217 	struct bio_bio_st *b, *peer_b;

   218 

   219 	BIO_clear_retry_flags(bio);

   220 

   221 	if (!bio->init)

   222 		return 0;

   223 

   224 	b = bio->ptr;

   225 	assert(b != NULL);

   226 	assert(b->peer != NULL);

   227 	peer_b = b->peer->ptr;

   228 	assert(peer_b != NULL);

   229 	assert(peer_b->buf != NULL);

   230 

   231 	peer_b->request = 0; /* will be set in "retry_read" situation */

   232 

   233 	if (buf == NULL || size == 0)

   234 		return 0;

   235 

   236 	if (peer_b->len == 0)

   237 		{

   238 		if (peer_b->closed)

   239 			return 0; /* writer has closed, and no data is left */

   240 		else

   241 			{

   242 			BIO_set_retry_read(bio); /* buffer is empty */

   243 			if (size <= peer_b->size)

   244 				peer_b->request = size;

   245 			else

   246 				/* don't ask for more than the peer can

   247 				 * deliver in one write */

   248 				peer_b->request = peer_b->size;

   249 			return -1;

   250 			}

   251 		}

   252 

   253 	/* we can read */

   254 	if (peer_b->len < size)

   255 		size = peer_b->len;

   256 

   257 	/* now read "size" bytes */

   258 	

   259 	rest = size;

   260 	

   261 	assert(rest > 0);

   262 	do /* one or two iterations */

   263 		{

   264 		size_t chunk;

   265 		

   266 		assert(rest <= peer_b->len);

   267 		if (peer_b->offset + rest <= peer_b->size)

   268 			chunk = rest;

   269 		else

   270 			/* wrap around ring buffer */

   271 			chunk = peer_b->size - peer_b->offset;

   272 		assert(peer_b->offset + chunk <= peer_b->size);

   273 		

   274 		memcpy(buf, peer_b->buf + peer_b->offset, chunk);

   275 		

   276 		peer_b->len -= chunk;

   277 		if (peer_b->len)

   278 			{

   279 			peer_b->offset += chunk;

   280 			assert(peer_b->offset <= peer_b->size);

   281 			if (peer_b->offset == peer_b->size)

   282 				peer_b->offset = 0;

   283 			buf += chunk;

   284 			}

   285 		else

   286 			{

   287 			/* buffer now empty, no need to advance "buf" */

   288 			assert(chunk == rest);

   289 			peer_b->offset = 0;

   290 			}

   291 		rest -= chunk;

   292 		}

   293 	while (rest);

   294 	

   295 	return size;

   296 	}

   297 

   298 /* non-copying interface: provide pointer to available data in buffer

   299  *    bio_nread0:  return number of available bytes

   300  *    bio_nread:   also advance index

   301  * (example usage:  bio_nread0(), read from buffer, bio_nread()

   302  *  or just         bio_nread(), read from buffer)

   303  */

   304 /* WARNING: The non-copying interface is largely untested as of yet

   305  * and may contain bugs. */

   306 static ssize_t bio_nread0(BIO *bio, char **buf)

   307 	{

   308 	struct bio_bio_st *b, *peer_b;

   309 	ssize_t num;

   310 	

   311 	BIO_clear_retry_flags(bio);

   312 

   313 	if (!bio->init)

   314 		return 0;

   315 	

   316 	b = bio->ptr;

   317 	assert(b != NULL);

   318 	assert(b->peer != NULL);

   319 	peer_b = b->peer->ptr;

   320 	assert(peer_b != NULL);

   321 	assert(peer_b->buf != NULL);

   322 	

   323 	peer_b->request = 0;

   324 	

   325 	if (peer_b->len == 0)

   326 		{

   327 		char dummy;

   328 		

   329 		/* avoid code duplication -- nothing available for reading */

   330 		return bio_read(bio, &dummy, 1); /* returns 0 or -1 */

   331 		}

   332 

   333 	num = peer_b->len;

   334 	if (peer_b->size < peer_b->offset + num)

   335 		/* no ring buffer wrap-around for non-copying interface */

   336 		num = peer_b->size - peer_b->offset;

   337 	assert(num > 0);

   338 

   339 	if (buf != NULL)

   340 		*buf = peer_b->buf + peer_b->offset;

   341 	return num;

   342 	}

   343 

   344 static ssize_t bio_nread(BIO *bio, char **buf, size_t num_)

   345 	{

   346 	struct bio_bio_st *b, *peer_b;

   347 	ssize_t num, available;

   348 

   349 	if (num_ > SSIZE_MAX)

   350 		num = SSIZE_MAX;

   351 	else

   352 		num = (ssize_t)num_;

   353 

   354 	available = bio_nread0(bio, buf);

   355 	if (num > available)

   356 		num = available;

   357 	if (num <= 0)

   358 		return num;

   359 

   360 	b = bio->ptr;

   361 	peer_b = b->peer->ptr;

   362 

   363 	peer_b->len -= num;

   364 	if (peer_b->len) 

   365 		{

   366 		peer_b->offset += num;

   367 		assert(peer_b->offset <= peer_b->size);

   368 		if (peer_b->offset == peer_b->size)

   369 			peer_b->offset = 0;

   370 		}

   371 	else

   372 		peer_b->offset = 0;

   373 

   374 	return num;

   375 	}

   376 

   377 

   378 static int bio_write(BIO *bio, const char *buf, int num_)

   379 	{

   380 	size_t num = num_;

   381 	size_t rest;

   382 	struct bio_bio_st *b;

   383 

   384 	BIO_clear_retry_flags(bio);

   385 

   386 	if (!bio->init || buf == NULL || num == 0)

   387 		return 0;

   388 

   389 	b = bio->ptr;		

   390 	assert(b != NULL);

   391 	assert(b->peer != NULL);

   392 	assert(b->buf != NULL);

   393 

   394 	b->request = 0;

   395 	if (b->closed)

   396 		{

   397 		/* we already closed */

   398 		BIOerr(BIO_F_BIO_WRITE, BIO_R_BROKEN_PIPE);

   399 		return -1;

   400 		}

   401 

   402 	assert(b->len <= b->size);

   403 

   404 	if (b->len == b->size)

   405 		{

   406 		BIO_set_retry_write(bio); /* buffer is full */

   407 		return -1;

   408 		}

   409 

   410 	/* we can write */

   411 	if (num > b->size - b->len)

   412 		num = b->size - b->len;

   413 	

   414 	/* now write "num" bytes */

   415 

   416 	rest = num;

   417 	

   418 	assert(rest > 0);

   419 	do /* one or two iterations */

   420 		{

   421 		size_t write_offset;

   422 		size_t chunk;

   423 

   424 		assert(b->len + rest <= b->size);

   425 

   426 		write_offset = b->offset + b->len;

   427 		if (write_offset >= b->size)

   428 			write_offset -= b->size;

   429 		/* b->buf[write_offset] is the first byte we can write to. */

   430 

   431 		if (write_offset + rest <= b->size)

   432 			chunk = rest;

   433 		else

   434 			/* wrap around ring buffer */

   435 			chunk = b->size - write_offset;

   436 		

   437 		memcpy(b->buf + write_offset, buf, chunk);

   438 		

   439 		b->len += chunk;

   440 

   441 		assert(b->len <= b->size);

   442 		

   443 		rest -= chunk;

   444 		buf += chunk;

   445 		}

   446 	while (rest);

   447 

   448 	return num;

   449 	}

   450 

   451 /* non-copying interface: provide pointer to region to write to

   452  *   bio_nwrite0:  check how much space is available

   453  *   bio_nwrite:   also increase length

   454  * (example usage:  bio_nwrite0(), write to buffer, bio_nwrite()

   455  *  or just         bio_nwrite(), write to buffer)

   456  */

   457 static ssize_t bio_nwrite0(BIO *bio, char **buf)

   458 	{

   459 	struct bio_bio_st *b;

   460 	size_t num;

   461 	size_t write_offset;

   462 

   463 	BIO_clear_retry_flags(bio);

   464 

   465 	if (!bio->init)

   466 		return 0;

   467 

   468 	b = bio->ptr;		

   469 	assert(b != NULL);

   470 	assert(b->peer != NULL);

   471 	assert(b->buf != NULL);

   472 

   473 	b->request = 0;

   474 	if (b->closed)

   475 		{

   476 		BIOerr(BIO_F_BIO_NWRITE0, BIO_R_BROKEN_PIPE);

   477 		return -1;

   478 		}

   479 

   480 	assert(b->len <= b->size);

   481 

   482 	if (b->len == b->size)

   483 		{

   484 		BIO_set_retry_write(bio);

   485 		return -1;

   486 		}

   487 

   488 	num = b->size - b->len;

   489 	write_offset = b->offset + b->len;

   490 	if (write_offset >= b->size)

   491 		write_offset -= b->size;

   492 	if (write_offset + num > b->size)

   493 		/* no ring buffer wrap-around for non-copying interface

   494 		 * (to fulfil the promise by BIO_ctrl_get_write_guarantee,

   495 		 * BIO_nwrite may have to be called twice) */

   496 		num = b->size - write_offset;

   497 

   498 	if (buf != NULL)

   499 		*buf = b->buf + write_offset;

   500 	assert(write_offset + num <= b->size);

   501 

   502 	return num;

   503 	}

   504 

   505 static ssize_t bio_nwrite(BIO *bio, char **buf, size_t num_)

   506 	{

   507 	struct bio_bio_st *b;

   508 	ssize_t num, space;

   509 

   510 	if (num_ > SSIZE_MAX)

   511 		num = SSIZE_MAX;

   512 	else

   513 		num = (ssize_t)num_;

   514 

   515 	space = bio_nwrite0(bio, buf);

   516 	if (num > space)

   517 		num = space;

   518 	if (num <= 0)

   519 		return num;

   520 	b = bio->ptr;

   521 	assert(b != NULL);

   522 	b->len += num;

   523 	assert(b->len <= b->size);

   524 

   525 	return num;

   526 	}

   527 

   528 

   529 static long bio_ctrl(BIO *bio, int cmd, long num, void *ptr)

   530 	{

   531 	long ret;

   532 	struct bio_bio_st *b = bio->ptr;

   533 	

   534 	assert(b != NULL);

   535 

   536 	switch (cmd)

   537 		{

   538 	/* specific CTRL codes */

   539 

   540 	case BIO_C_SET_WRITE_BUF_SIZE:

   541 		if (b->peer)

   542 			{

   543 			BIOerr(BIO_F_BIO_CTRL, BIO_R_IN_USE);

   544 			ret = 0;

   545 			}

   546 		else if (num == 0)

   547 			{

   548 			BIOerr(BIO_F_BIO_CTRL, BIO_R_INVALID_ARGUMENT);

   549 			ret = 0;

   550 			}

   551 		else

   552 			{

   553 			size_t new_size = num;

   554 

   555 			if (b->size != new_size)

   556 				{

   557 				if (b->buf) 

   558 					{

   559 					OPENSSL_free(b->buf);

   560 					b->buf = NULL;

   561 					}

   562 				b->size = new_size;

   563 				}

   564 			ret = 1;

   565 			}

   566 		break;

   567 

   568 	case BIO_C_GET_WRITE_BUF_SIZE:

   569 		ret = (long) b->size;

   570 		break;

   571 

   572 	case BIO_C_MAKE_BIO_PAIR:

   573 		{

   574 		BIO *other_bio = ptr;

   575 		

   576 		if (bio_make_pair(bio, other_bio))

   577 			ret = 1;

   578 		else

   579 			ret = 0;

   580 		}

   581 		break;

   582 		

   583 	case BIO_C_DESTROY_BIO_PAIR:

   584 		/* Affects both BIOs in the pair -- call just once!

   585 		 * Or let BIO_free(bio1); BIO_free(bio2); do the job. */

   586 		bio_destroy_pair(bio);

   587 		ret = 1;

   588 		break;

   589 

   590 	case BIO_C_GET_WRITE_GUARANTEE:

   591 		/* How many bytes can the caller feed to the next write

   592 		 * without having to keep any? */

   593 		if (b->peer == NULL || b->closed)

   594 			ret = 0;

   595 		else

   596 			ret = (long) b->size - b->len;

   597 		break;

   598 

   599 	case BIO_C_GET_READ_REQUEST:

   600 		/* If the peer unsuccessfully tried to read, how many bytes

   601 		 * were requested?  (As with BIO_CTRL_PENDING, that number

   602 		 * can usually be treated as boolean.) */

   603 		ret = (long) b->request;

   604 		break;

   605 

   606 	case BIO_C_RESET_READ_REQUEST:

   607 		/* Reset request.  (Can be useful after read attempts

   608 		 * at the other side that are meant to be non-blocking,

   609 		 * e.g. when probing SSL_read to see if any data is

   610 		 * available.) */

   611 		b->request = 0;

   612 		ret = 1;

   613 		break;

   614 

   615 	case BIO_C_SHUTDOWN_WR:

   616 		/* similar to shutdown(..., SHUT_WR) */

   617 		b->closed = 1;

   618 		ret = 1;

   619 		break;

   620 

   621 	case BIO_C_NREAD0:

   622 		/* prepare for non-copying read */

   623 		ret = (long) bio_nread0(bio, ptr);

   624 		break;

   625 		

   626 	case BIO_C_NREAD:

   627 		/* non-copying read */

   628 		ret = (long) bio_nread(bio, ptr, (size_t) num);

   629 		break;

   630 		

   631 	case BIO_C_NWRITE0:

   632 		/* prepare for non-copying write */

   633 		ret = (long) bio_nwrite0(bio, ptr);

   634 		break;

   635 

   636 	case BIO_C_NWRITE:

   637 		/* non-copying write */

   638 		ret = (long) bio_nwrite(bio, ptr, (size_t) num);

   639 		break;

   640 		

   641 

   642 	/* standard CTRL codes follow */

   643 

   644 	case BIO_CTRL_RESET:

   645 		if (b->buf != NULL)

   646 			{

   647 			b->len = 0;

   648 			b->offset = 0;

   649 			}

   650 		ret = 0;

   651 		break;		

   652 

   653 	case BIO_CTRL_GET_CLOSE:

   654 		ret = bio->shutdown;

   655 		break;

   656 

   657 	case BIO_CTRL_SET_CLOSE:

   658 		bio->shutdown = (int) num;

   659 		ret = 1;

   660 		break;

   661 

   662 	case BIO_CTRL_PENDING:

   663 		if (b->peer != NULL)

   664 			{

   665 			struct bio_bio_st *peer_b = b->peer->ptr;

   666 			

   667 			ret = (long) peer_b->len;

   668 			}

   669 		else

   670 			ret = 0;

   671 		break;

   672 

   673 	case BIO_CTRL_WPENDING:

   674 		if (b->buf != NULL)

   675 			ret = (long) b->len;

   676 		else

   677 			ret = 0;

   678 		break;

   679 

   680 	case BIO_CTRL_DUP:

   681 		/* See BIO_dup_chain for circumstances we have to expect. */

   682 		{

   683 		BIO *other_bio = ptr;

   684 		struct bio_bio_st *other_b;

   685 		

   686 		assert(other_bio != NULL);

   687 		other_b = other_bio->ptr;

   688 		assert(other_b != NULL);

   689 		

   690 		assert(other_b->buf == NULL); /* other_bio is always fresh */

   691 

   692 		other_b->size = b->size;

   693 		}

   694 

   695 		ret = 1;

   696 		break;

   697 

   698 	case BIO_CTRL_FLUSH:

   699 		ret = 1;

   700 		break;

   701 

   702 	case BIO_CTRL_EOF:

   703 		{

   704 		BIO *other_bio = ptr;

   705 		

   706 		if (other_bio)

   707 			{

   708 			struct bio_bio_st *other_b = other_bio->ptr;

   709 			

   710 			assert(other_b != NULL);

   711 			ret = other_b->len == 0 && other_b->closed;

   712 			}

   713 		else

   714 			ret = 1;

   715 		}

   716 		break;

   717 

   718 	default:

   719 		ret = 0;

   720 		}

   721 	return ret;

   722 	}

   723 

   724 static int bio_puts(BIO *bio, const char *str)

   725 	{

   726 	return bio_write(bio, str, strlen(str));

   727 	}

   728 

   729 

   730 static int bio_make_pair(BIO *bio1, BIO *bio2)

   731 	{

   732 	struct bio_bio_st *b1, *b2;

   733 

   734 	assert(bio1 != NULL);

   735 	assert(bio2 != NULL);

   736 

   737 	b1 = bio1->ptr;

   738 	b2 = bio2->ptr;

   739 	

   740 	if (b1->peer != NULL || b2->peer != NULL)

   741 		{

   742 		BIOerr(BIO_F_BIO_MAKE_PAIR, BIO_R_IN_USE);

   743 		return 0;

   744 		}

   745 	

   746 	if (b1->buf == NULL)

   747 		{

   748 		b1->buf = OPENSSL_malloc(b1->size);

   749 		if (b1->buf == NULL)

   750 			{

   751 			BIOerr(BIO_F_BIO_MAKE_PAIR, ERR_R_MALLOC_FAILURE);

   752 			return 0;

   753 			}

   754 		b1->len = 0;

   755 		b1->offset = 0;

   756 		}

   757 	

   758 	if (b2->buf == NULL)

   759 		{

   760 		b2->buf = OPENSSL_malloc(b2->size);

   761 		if (b2->buf == NULL)

   762 			{

   763 			BIOerr(BIO_F_BIO_MAKE_PAIR, ERR_R_MALLOC_FAILURE);

   764 			return 0;

   765 			}

   766 		b2->len = 0;

   767 		b2->offset = 0;

   768 		}

   769 	

   770 	b1->peer = bio2;

   771 	b1->closed = 0;

   772 	b1->request = 0;

   773 	b2->peer = bio1;

   774 	b2->closed = 0;

   775 	b2->request = 0;

   776 

   777 	bio1->init = 1;

   778 	bio2->init = 1;

   779 

   780 	return 1;

   781 	}

   782 

   783 static void bio_destroy_pair(BIO *bio)

   784 	{

   785 	struct bio_bio_st *b = bio->ptr;

   786 

   787 	if (b != NULL)

   788 		{

   789 		BIO *peer_bio = b->peer;

   790 

   791 		if (peer_bio != NULL)

   792 			{

   793 			struct bio_bio_st *peer_b = peer_bio->ptr;

   794 

   795 			assert(peer_b != NULL);

   796 			assert(peer_b->peer == bio);

   797 

   798 			peer_b->peer = NULL;

   799 			peer_bio->init = 0;

   800 			assert(peer_b->buf != NULL);

   801 			peer_b->len = 0;

   802 			peer_b->offset = 0;

   803 			

   804 			b->peer = NULL;

   805 			bio->init = 0;

   806 			assert(b->buf != NULL);

   807 			b->len = 0;

   808 			b->offset = 0;

   809 			}

   810 		}

   811 	}

   812  

   813 

   814 /* Exported convenience functions */

   815 EXPORT_C int BIO_new_bio_pair(BIO **bio1_p, size_t writebuf1,

   816 	BIO **bio2_p, size_t writebuf2)

   817 	 {

   818 	 BIO *bio1 = NULL, *bio2 = NULL;

   819 	 long r;

   820 	 int ret = 0;

   821 

   822 	 bio1 = BIO_new(BIO_s_bio());

   823 	 if (bio1 == NULL)

   824 		 goto err;

   825 	 bio2 = BIO_new(BIO_s_bio());

   826 	 if (bio2 == NULL)

   827 		 goto err;

   828 

   829 	 if (writebuf1)

   830 		 {

   831 		 r = BIO_set_write_buf_size(bio1, writebuf1);

   832 		 if (!r)

   833 			 goto err;

   834 		 }

   835 	 if (writebuf2)

   836 		 {

   837 		 r = BIO_set_write_buf_size(bio2, writebuf2);

   838 		 if (!r)

   839 			 goto err;

   840 		 }

   841 

   842 	 r = BIO_make_bio_pair(bio1, bio2);

   843 	 if (!r)

   844 		 goto err;

   845 	 ret = 1;

   846 

   847  err:

   848 	 if (ret == 0)

   849 		 {

   850 		 if (bio1)

   851 			 {

   852 			 BIO_free(bio1);

   853 			 bio1 = NULL;

   854 			 }

   855 		 if (bio2)

   856 			 {

   857 			 BIO_free(bio2);

   858 			 bio2 = NULL;

   859 			 }

   860 		 }

   861 

   862 	 *bio1_p = bio1;

   863 	 *bio2_p = bio2;

   864 	 return ret;

   865 	 }

   866 

   867 EXPORT_C size_t BIO_ctrl_get_write_guarantee(BIO *bio)

   868 	{

   869 	return BIO_ctrl(bio, BIO_C_GET_WRITE_GUARANTEE, 0, NULL);

   870 	}

   871 

   872 EXPORT_C size_t BIO_ctrl_get_read_request(BIO *bio)

   873 	{

   874 	return BIO_ctrl(bio, BIO_C_GET_READ_REQUEST, 0, NULL);

   875 	}

   876 

   877 EXPORT_C int BIO_ctrl_reset_read_request(BIO *bio)

   878 	{

   879 	return (BIO_ctrl(bio, BIO_C_RESET_READ_REQUEST, 0, NULL) != 0);

   880 	}

   881 

   882 

   883 /* BIO_nread0/nread/nwrite0/nwrite are available only for BIO pairs for now

   884  * (conceivably some other BIOs could allow non-copying reads and writes too.)

   885  */

   886 EXPORT_C int BIO_nread0(BIO *bio, char **buf)

   887 	{

   888 	long ret;

   889 

   890 	if (!bio->init)

   891 		{

   892 		BIOerr(BIO_F_BIO_NREAD0, BIO_R_UNINITIALIZED);

   893 		return -2;

   894 		}

   895 

   896 	ret = BIO_ctrl(bio, BIO_C_NREAD0, 0, buf);

   897 	if (ret > INT_MAX)

   898 		return INT_MAX;

   899 	else

   900 		return (int) ret;

   901 	}

   902 

   903 EXPORT_C int BIO_nread(BIO *bio, char **buf, int num)

   904 	{

   905 	int ret;

   906 

   907 	if (!bio->init)

   908 		{

   909 		BIOerr(BIO_F_BIO_NREAD, BIO_R_UNINITIALIZED);

   910 		return -2;

   911 		}

   912 

   913 	ret = (int) BIO_ctrl(bio, BIO_C_NREAD, num, buf);

   914 	if (ret > 0)

   915 		bio->num_read += ret;

   916 	return ret;

   917 	}

   918 

   919 EXPORT_C int BIO_nwrite0(BIO *bio, char **buf)

   920 	{

   921 	long ret;

   922 

   923 	if (!bio->init)

   924 		{

   925 		BIOerr(BIO_F_BIO_NWRITE0, BIO_R_UNINITIALIZED);

   926 		return -2;

   927 		}

   928 

   929 	ret = BIO_ctrl(bio, BIO_C_NWRITE0, 0, buf);

   930 	if (ret > INT_MAX)

   931 		return INT_MAX;

   932 	else

   933 		return (int) ret;

   934 	}

   935 

   936 EXPORT_C int BIO_nwrite(BIO *bio, char **buf, int num)

   937 	{

   938 	int ret;

   939 

   940 	if (!bio->init)

   941 		{

   942 		BIOerr(BIO_F_BIO_NWRITE, BIO_R_UNINITIALIZED);

   943 		return -2;

   944 		}

   945 

   946 	ret = BIO_ctrl(bio, BIO_C_NWRITE, num, buf);

   947 	if (ret > 0)

   948 		bio->num_read += ret;

   949 	return ret;

   950 	}