sl@0: /* crypto/bio/bss_bio.c  -*- Mode: C; c-file-style: "eay" -*- */
sl@0: /* ====================================================================
sl@0:  * Copyright (c) 1998-2003 The OpenSSL Project.  All rights reserved.
sl@0:  *
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  *
sl@0:  * 1. Redistributions of source code must retain the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer. 
sl@0:  *
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in
sl@0:  *    the documentation and/or other materials provided with the
sl@0:  *    distribution.
sl@0:  *
sl@0:  * 3. All advertising materials mentioning features or use of this
sl@0:  *    software must display the following acknowledgment:
sl@0:  *    "This product includes software developed by the OpenSSL Project
sl@0:  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
sl@0:  *
sl@0:  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
sl@0:  *    endorse or promote products derived from this software without
sl@0:  *    prior written permission. For written permission, please contact
sl@0:  *    openssl-core@openssl.org.
sl@0:  *
sl@0:  * 5. Products derived from this software may not be called "OpenSSL"
sl@0:  *    nor may "OpenSSL" appear in their names without prior written
sl@0:  *    permission of the OpenSSL Project.
sl@0:  *
sl@0:  * 6. Redistributions of any form whatsoever must retain the following
sl@0:  *    acknowledgment:
sl@0:  *    "This product includes software developed by the OpenSSL Project
sl@0:  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
sl@0:  *
sl@0:  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
sl@0:  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
sl@0:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
sl@0:  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
sl@0:  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
sl@0:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
sl@0:  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
sl@0:  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
sl@0:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
sl@0:  * OF THE POSSIBILITY OF SUCH DAMAGE.
sl@0:  * ====================================================================
sl@0:  *
sl@0:  * This product includes cryptographic software written by Eric Young
sl@0:  * (eay@cryptsoft.com).  This product includes software written by Tim
sl@0:  * Hudson (tjh@cryptsoft.com).
sl@0:  *
sl@0:  */
sl@0: /*
sl@0:  © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.
sl@0:  */
sl@0: 
sl@0: /* Special method for a BIO where the other endpoint is also a BIO
sl@0:  * of this kind, handled by the same thread (i.e. the "peer" is actually
sl@0:  * ourselves, wearing a different hat).
sl@0:  * Such "BIO pairs" are mainly for using the SSL library with I/O interfaces
sl@0:  * for which no specific BIO method is available.
sl@0:  * See ssl/ssltest.c for some hints on how this can be used. */
sl@0: 
sl@0: /* BIO_DEBUG implies BIO_PAIR_DEBUG */
sl@0: #ifdef BIO_DEBUG
sl@0: # ifndef BIO_PAIR_DEBUG
sl@0: #  define BIO_PAIR_DEBUG
sl@0: # endif
sl@0: #endif
sl@0: 
sl@0: /* disable assert() unless BIO_PAIR_DEBUG has been defined */
sl@0: #ifndef BIO_PAIR_DEBUG
sl@0: # ifndef NDEBUG
sl@0: #  define NDEBUG
sl@0: # endif
sl@0: #endif
sl@0: 
sl@0: #include <assert.h>
sl@0: #include <limits.h>
sl@0: #include <stdlib.h>
sl@0: #include <string.h>
sl@0: 
sl@0: #include <openssl/bio.h>
sl@0: #include <openssl/err.h>
sl@0: #include <openssl/crypto.h>
sl@0: 
sl@0: #include "e_os.h"
sl@0: #if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))
sl@0: #include "libcrypto_wsd_macros.h"
sl@0: #include "libcrypto_wsd.h"
sl@0: #endif
sl@0: 
sl@0: /* VxWorks defines SSIZE_MAX with an empty value causing compile errors */
sl@0: #if defined(OPENSSL_SYS_VXWORKS)
sl@0: # undef SSIZE_MAX
sl@0: #endif
sl@0: #ifndef SSIZE_MAX
sl@0: # define SSIZE_MAX INT_MAX
sl@0: #endif
sl@0: 
sl@0: static int bio_new(BIO *bio);
sl@0: static int bio_free(BIO *bio);
sl@0: static int bio_read(BIO *bio, char *buf, int size);
sl@0: static int bio_write(BIO *bio, const char *buf, int num);
sl@0: static long bio_ctrl(BIO *bio, int cmd, long num, void *ptr);
sl@0: static int bio_puts(BIO *bio, const char *str);
sl@0: 
sl@0: static int bio_make_pair(BIO *bio1, BIO *bio2);
sl@0: static void bio_destroy_pair(BIO *bio);
sl@0: 
sl@0: #ifndef EMULATOR
sl@0: static BIO_METHOD methods_biop =
sl@0: {
sl@0: 	BIO_TYPE_BIO,
sl@0: 	"BIO pair",
sl@0: 	bio_write,
sl@0: 	bio_read,
sl@0: 	bio_puts,
sl@0: 	NULL /* no bio_gets */,
sl@0: 	bio_ctrl,
sl@0: 	bio_new,
sl@0: 	bio_free,
sl@0: 	NULL /* no bio_callback_ctrl */
sl@0: };
sl@0: #else
sl@0: 
sl@0: GET_STATIC_VAR_FROM_TLS(methods_biop,bss_bio,BIO_METHOD)
sl@0: #define methods_biop (*GET_WSD_VAR_NAME(methods_biop,bss_bio,s)())
sl@0: const BIO_METHOD temp_s_methods_biop =
sl@0: {
sl@0: 	BIO_TYPE_BIO,
sl@0: 	"BIO pair",
sl@0: 	bio_write,
sl@0: 	bio_read,
sl@0: 	bio_puts,
sl@0: 	NULL /* no bio_gets */,
sl@0: 	bio_ctrl,
sl@0: 	bio_new,
sl@0: 	bio_free,
sl@0: 	NULL /* no bio_callback_ctrl */
sl@0: };
sl@0: #endif	
sl@0: 
sl@0: EXPORT_C BIO_METHOD *BIO_s_bio(void)
sl@0: 	{
sl@0: 	return &methods_biop;
sl@0: 	}
sl@0: 
sl@0: struct bio_bio_st
sl@0: {
sl@0: 	BIO *peer;     /* NULL if buf == NULL.
sl@0: 	                * If peer != NULL, then peer->ptr is also a bio_bio_st,
sl@0: 	                * and its "peer" member points back to us.
sl@0: 	                * peer != NULL iff init != 0 in the BIO. */
sl@0: 	
sl@0: 	/* This is for what we write (i.e. reading uses peer's struct): */
sl@0: 	int closed;     /* valid iff peer != NULL */
sl@0: 	size_t len;     /* valid iff buf != NULL; 0 if peer == NULL */
sl@0: 	size_t offset;  /* valid iff buf != NULL; 0 if len == 0 */
sl@0: 	size_t size;
sl@0: 	char *buf;      /* "size" elements (if != NULL) */
sl@0: 
sl@0: 	size_t request; /* valid iff peer != NULL; 0 if len != 0,
sl@0: 	                 * otherwise set by peer to number of bytes
sl@0: 	                 * it (unsuccessfully) tried to read,
sl@0: 	                 * never more than buffer space (size-len) warrants. */
sl@0: };
sl@0: 
sl@0: static int bio_new(BIO *bio)
sl@0: 	{
sl@0: 	struct bio_bio_st *b;
sl@0: 	
sl@0: 	b = OPENSSL_malloc(sizeof *b);
sl@0: 	if (b == NULL)
sl@0: 		return 0;
sl@0: 
sl@0: 	b->peer = NULL;
sl@0: 	b->size = 17*1024; /* enough for one TLS record (just a default) */
sl@0: 	b->buf = NULL;
sl@0: 
sl@0: 	bio->ptr = b;
sl@0: 	return 1;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: static int bio_free(BIO *bio)
sl@0: 	{
sl@0: 	struct bio_bio_st *b;
sl@0: 
sl@0: 	if (bio == NULL)
sl@0: 		return 0;
sl@0: 	b = bio->ptr;
sl@0: 
sl@0: 	assert(b != NULL);
sl@0: 
sl@0: 	if (b->peer)
sl@0: 		bio_destroy_pair(bio);
sl@0: 	
sl@0: 	if (b->buf != NULL)
sl@0: 		{
sl@0: 		OPENSSL_free(b->buf);
sl@0: 		}
sl@0: 
sl@0: 	OPENSSL_free(b);
sl@0: 
sl@0: 	return 1;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: 
sl@0: static int bio_read(BIO *bio, char *buf, int size_)
sl@0: 	{
sl@0: 	size_t size = size_;
sl@0: 	size_t rest;
sl@0: 	struct bio_bio_st *b, *peer_b;
sl@0: 
sl@0: 	BIO_clear_retry_flags(bio);
sl@0: 
sl@0: 	if (!bio->init)
sl@0: 		return 0;
sl@0: 
sl@0: 	b = bio->ptr;
sl@0: 	assert(b != NULL);
sl@0: 	assert(b->peer != NULL);
sl@0: 	peer_b = b->peer->ptr;
sl@0: 	assert(peer_b != NULL);
sl@0: 	assert(peer_b->buf != NULL);
sl@0: 
sl@0: 	peer_b->request = 0; /* will be set in "retry_read" situation */
sl@0: 
sl@0: 	if (buf == NULL || size == 0)
sl@0: 		return 0;
sl@0: 
sl@0: 	if (peer_b->len == 0)
sl@0: 		{
sl@0: 		if (peer_b->closed)
sl@0: 			return 0; /* writer has closed, and no data is left */
sl@0: 		else
sl@0: 			{
sl@0: 			BIO_set_retry_read(bio); /* buffer is empty */
sl@0: 			if (size <= peer_b->size)
sl@0: 				peer_b->request = size;
sl@0: 			else
sl@0: 				/* don't ask for more than the peer can
sl@0: 				 * deliver in one write */
sl@0: 				peer_b->request = peer_b->size;
sl@0: 			return -1;
sl@0: 			}
sl@0: 		}
sl@0: 
sl@0: 	/* we can read */
sl@0: 	if (peer_b->len < size)
sl@0: 		size = peer_b->len;
sl@0: 
sl@0: 	/* now read "size" bytes */
sl@0: 	
sl@0: 	rest = size;
sl@0: 	
sl@0: 	assert(rest > 0);
sl@0: 	do /* one or two iterations */
sl@0: 		{
sl@0: 		size_t chunk;
sl@0: 		
sl@0: 		assert(rest <= peer_b->len);
sl@0: 		if (peer_b->offset + rest <= peer_b->size)
sl@0: 			chunk = rest;
sl@0: 		else
sl@0: 			/* wrap around ring buffer */
sl@0: 			chunk = peer_b->size - peer_b->offset;
sl@0: 		assert(peer_b->offset + chunk <= peer_b->size);
sl@0: 		
sl@0: 		memcpy(buf, peer_b->buf + peer_b->offset, chunk);
sl@0: 		
sl@0: 		peer_b->len -= chunk;
sl@0: 		if (peer_b->len)
sl@0: 			{
sl@0: 			peer_b->offset += chunk;
sl@0: 			assert(peer_b->offset <= peer_b->size);
sl@0: 			if (peer_b->offset == peer_b->size)
sl@0: 				peer_b->offset = 0;
sl@0: 			buf += chunk;
sl@0: 			}
sl@0: 		else
sl@0: 			{
sl@0: 			/* buffer now empty, no need to advance "buf" */
sl@0: 			assert(chunk == rest);
sl@0: 			peer_b->offset = 0;
sl@0: 			}
sl@0: 		rest -= chunk;
sl@0: 		}
sl@0: 	while (rest);
sl@0: 	
sl@0: 	return size;
sl@0: 	}
sl@0: 
sl@0: /* non-copying interface: provide pointer to available data in buffer
sl@0:  *    bio_nread0:  return number of available bytes
sl@0:  *    bio_nread:   also advance index
sl@0:  * (example usage:  bio_nread0(), read from buffer, bio_nread()
sl@0:  *  or just         bio_nread(), read from buffer)
sl@0:  */
sl@0: /* WARNING: The non-copying interface is largely untested as of yet
sl@0:  * and may contain bugs. */
sl@0: static ssize_t bio_nread0(BIO *bio, char **buf)
sl@0: 	{
sl@0: 	struct bio_bio_st *b, *peer_b;
sl@0: 	ssize_t num;
sl@0: 	
sl@0: 	BIO_clear_retry_flags(bio);
sl@0: 
sl@0: 	if (!bio->init)
sl@0: 		return 0;
sl@0: 	
sl@0: 	b = bio->ptr;
sl@0: 	assert(b != NULL);
sl@0: 	assert(b->peer != NULL);
sl@0: 	peer_b = b->peer->ptr;
sl@0: 	assert(peer_b != NULL);
sl@0: 	assert(peer_b->buf != NULL);
sl@0: 	
sl@0: 	peer_b->request = 0;
sl@0: 	
sl@0: 	if (peer_b->len == 0)
sl@0: 		{
sl@0: 		char dummy;
sl@0: 		
sl@0: 		/* avoid code duplication -- nothing available for reading */
sl@0: 		return bio_read(bio, &dummy, 1); /* returns 0 or -1 */
sl@0: 		}
sl@0: 
sl@0: 	num = peer_b->len;
sl@0: 	if (peer_b->size < peer_b->offset + num)
sl@0: 		/* no ring buffer wrap-around for non-copying interface */
sl@0: 		num = peer_b->size - peer_b->offset;
sl@0: 	assert(num > 0);
sl@0: 
sl@0: 	if (buf != NULL)
sl@0: 		*buf = peer_b->buf + peer_b->offset;
sl@0: 	return num;
sl@0: 	}
sl@0: 
sl@0: static ssize_t bio_nread(BIO *bio, char **buf, size_t num_)
sl@0: 	{
sl@0: 	struct bio_bio_st *b, *peer_b;
sl@0: 	ssize_t num, available;
sl@0: 
sl@0: 	if (num_ > SSIZE_MAX)
sl@0: 		num = SSIZE_MAX;
sl@0: 	else
sl@0: 		num = (ssize_t)num_;
sl@0: 
sl@0: 	available = bio_nread0(bio, buf);
sl@0: 	if (num > available)
sl@0: 		num = available;
sl@0: 	if (num <= 0)
sl@0: 		return num;
sl@0: 
sl@0: 	b = bio->ptr;
sl@0: 	peer_b = b->peer->ptr;
sl@0: 
sl@0: 	peer_b->len -= num;
sl@0: 	if (peer_b->len) 
sl@0: 		{
sl@0: 		peer_b->offset += num;
sl@0: 		assert(peer_b->offset <= peer_b->size);
sl@0: 		if (peer_b->offset == peer_b->size)
sl@0: 			peer_b->offset = 0;
sl@0: 		}
sl@0: 	else
sl@0: 		peer_b->offset = 0;
sl@0: 
sl@0: 	return num;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: static int bio_write(BIO *bio, const char *buf, int num_)
sl@0: 	{
sl@0: 	size_t num = num_;
sl@0: 	size_t rest;
sl@0: 	struct bio_bio_st *b;
sl@0: 
sl@0: 	BIO_clear_retry_flags(bio);
sl@0: 
sl@0: 	if (!bio->init || buf == NULL || num == 0)
sl@0: 		return 0;
sl@0: 
sl@0: 	b = bio->ptr;		
sl@0: 	assert(b != NULL);
sl@0: 	assert(b->peer != NULL);
sl@0: 	assert(b->buf != NULL);
sl@0: 
sl@0: 	b->request = 0;
sl@0: 	if (b->closed)
sl@0: 		{
sl@0: 		/* we already closed */
sl@0: 		BIOerr(BIO_F_BIO_WRITE, BIO_R_BROKEN_PIPE);
sl@0: 		return -1;
sl@0: 		}
sl@0: 
sl@0: 	assert(b->len <= b->size);
sl@0: 
sl@0: 	if (b->len == b->size)
sl@0: 		{
sl@0: 		BIO_set_retry_write(bio); /* buffer is full */
sl@0: 		return -1;
sl@0: 		}
sl@0: 
sl@0: 	/* we can write */
sl@0: 	if (num > b->size - b->len)
sl@0: 		num = b->size - b->len;
sl@0: 	
sl@0: 	/* now write "num" bytes */
sl@0: 
sl@0: 	rest = num;
sl@0: 	
sl@0: 	assert(rest > 0);
sl@0: 	do /* one or two iterations */
sl@0: 		{
sl@0: 		size_t write_offset;
sl@0: 		size_t chunk;
sl@0: 
sl@0: 		assert(b->len + rest <= b->size);
sl@0: 
sl@0: 		write_offset = b->offset + b->len;
sl@0: 		if (write_offset >= b->size)
sl@0: 			write_offset -= b->size;
sl@0: 		/* b->buf[write_offset] is the first byte we can write to. */
sl@0: 
sl@0: 		if (write_offset + rest <= b->size)
sl@0: 			chunk = rest;
sl@0: 		else
sl@0: 			/* wrap around ring buffer */
sl@0: 			chunk = b->size - write_offset;
sl@0: 		
sl@0: 		memcpy(b->buf + write_offset, buf, chunk);
sl@0: 		
sl@0: 		b->len += chunk;
sl@0: 
sl@0: 		assert(b->len <= b->size);
sl@0: 		
sl@0: 		rest -= chunk;
sl@0: 		buf += chunk;
sl@0: 		}
sl@0: 	while (rest);
sl@0: 
sl@0: 	return num;
sl@0: 	}
sl@0: 
sl@0: /* non-copying interface: provide pointer to region to write to
sl@0:  *   bio_nwrite0:  check how much space is available
sl@0:  *   bio_nwrite:   also increase length
sl@0:  * (example usage:  bio_nwrite0(), write to buffer, bio_nwrite()
sl@0:  *  or just         bio_nwrite(), write to buffer)
sl@0:  */
sl@0: static ssize_t bio_nwrite0(BIO *bio, char **buf)
sl@0: 	{
sl@0: 	struct bio_bio_st *b;
sl@0: 	size_t num;
sl@0: 	size_t write_offset;
sl@0: 
sl@0: 	BIO_clear_retry_flags(bio);
sl@0: 
sl@0: 	if (!bio->init)
sl@0: 		return 0;
sl@0: 
sl@0: 	b = bio->ptr;		
sl@0: 	assert(b != NULL);
sl@0: 	assert(b->peer != NULL);
sl@0: 	assert(b->buf != NULL);
sl@0: 
sl@0: 	b->request = 0;
sl@0: 	if (b->closed)
sl@0: 		{
sl@0: 		BIOerr(BIO_F_BIO_NWRITE0, BIO_R_BROKEN_PIPE);
sl@0: 		return -1;
sl@0: 		}
sl@0: 
sl@0: 	assert(b->len <= b->size);
sl@0: 
sl@0: 	if (b->len == b->size)
sl@0: 		{
sl@0: 		BIO_set_retry_write(bio);
sl@0: 		return -1;
sl@0: 		}
sl@0: 
sl@0: 	num = b->size - b->len;
sl@0: 	write_offset = b->offset + b->len;
sl@0: 	if (write_offset >= b->size)
sl@0: 		write_offset -= b->size;
sl@0: 	if (write_offset + num > b->size)
sl@0: 		/* no ring buffer wrap-around for non-copying interface
sl@0: 		 * (to fulfil the promise by BIO_ctrl_get_write_guarantee,
sl@0: 		 * BIO_nwrite may have to be called twice) */
sl@0: 		num = b->size - write_offset;
sl@0: 
sl@0: 	if (buf != NULL)
sl@0: 		*buf = b->buf + write_offset;
sl@0: 	assert(write_offset + num <= b->size);
sl@0: 
sl@0: 	return num;
sl@0: 	}
sl@0: 
sl@0: static ssize_t bio_nwrite(BIO *bio, char **buf, size_t num_)
sl@0: 	{
sl@0: 	struct bio_bio_st *b;
sl@0: 	ssize_t num, space;
sl@0: 
sl@0: 	if (num_ > SSIZE_MAX)
sl@0: 		num = SSIZE_MAX;
sl@0: 	else
sl@0: 		num = (ssize_t)num_;
sl@0: 
sl@0: 	space = bio_nwrite0(bio, buf);
sl@0: 	if (num > space)
sl@0: 		num = space;
sl@0: 	if (num <= 0)
sl@0: 		return num;
sl@0: 	b = bio->ptr;
sl@0: 	assert(b != NULL);
sl@0: 	b->len += num;
sl@0: 	assert(b->len <= b->size);
sl@0: 
sl@0: 	return num;
sl@0: 	}
sl@0: 
sl@0: 
sl@0: static long bio_ctrl(BIO *bio, int cmd, long num, void *ptr)
sl@0: 	{
sl@0: 	long ret;
sl@0: 	struct bio_bio_st *b = bio->ptr;
sl@0: 	
sl@0: 	assert(b != NULL);
sl@0: 
sl@0: 	switch (cmd)
sl@0: 		{
sl@0: 	/* specific CTRL codes */
sl@0: 
sl@0: 	case BIO_C_SET_WRITE_BUF_SIZE:
sl@0: 		if (b->peer)
sl@0: 			{
sl@0: 			BIOerr(BIO_F_BIO_CTRL, BIO_R_IN_USE);
sl@0: 			ret = 0;
sl@0: 			}
sl@0: 		else if (num == 0)
sl@0: 			{
sl@0: 			BIOerr(BIO_F_BIO_CTRL, BIO_R_INVALID_ARGUMENT);
sl@0: 			ret = 0;
sl@0: 			}
sl@0: 		else
sl@0: 			{
sl@0: 			size_t new_size = num;
sl@0: 
sl@0: 			if (b->size != new_size)
sl@0: 				{
sl@0: 				if (b->buf) 
sl@0: 					{
sl@0: 					OPENSSL_free(b->buf);
sl@0: 					b->buf = NULL;
sl@0: 					}
sl@0: 				b->size = new_size;
sl@0: 				}
sl@0: 			ret = 1;
sl@0: 			}
sl@0: 		break;
sl@0: 
sl@0: 	case BIO_C_GET_WRITE_BUF_SIZE:
sl@0: 		ret = (long) b->size;
sl@0: 		break;
sl@0: 
sl@0: 	case BIO_C_MAKE_BIO_PAIR:
sl@0: 		{
sl@0: 		BIO *other_bio = ptr;
sl@0: 		
sl@0: 		if (bio_make_pair(bio, other_bio))
sl@0: 			ret = 1;
sl@0: 		else
sl@0: 			ret = 0;
sl@0: 		}
sl@0: 		break;
sl@0: 		
sl@0: 	case BIO_C_DESTROY_BIO_PAIR:
sl@0: 		/* Affects both BIOs in the pair -- call just once!
sl@0: 		 * Or let BIO_free(bio1); BIO_free(bio2); do the job. */
sl@0: 		bio_destroy_pair(bio);
sl@0: 		ret = 1;
sl@0: 		break;
sl@0: 
sl@0: 	case BIO_C_GET_WRITE_GUARANTEE:
sl@0: 		/* How many bytes can the caller feed to the next write
sl@0: 		 * without having to keep any? */
sl@0: 		if (b->peer == NULL || b->closed)
sl@0: 			ret = 0;
sl@0: 		else
sl@0: 			ret = (long) b->size - b->len;
sl@0: 		break;
sl@0: 
sl@0: 	case BIO_C_GET_READ_REQUEST:
sl@0: 		/* If the peer unsuccessfully tried to read, how many bytes
sl@0: 		 * were requested?  (As with BIO_CTRL_PENDING, that number
sl@0: 		 * can usually be treated as boolean.) */
sl@0: 		ret = (long) b->request;
sl@0: 		break;
sl@0: 
sl@0: 	case BIO_C_RESET_READ_REQUEST:
sl@0: 		/* Reset request.  (Can be useful after read attempts
sl@0: 		 * at the other side that are meant to be non-blocking,
sl@0: 		 * e.g. when probing SSL_read to see if any data is
sl@0: 		 * available.) */
sl@0: 		b->request = 0;
sl@0: 		ret = 1;
sl@0: 		break;
sl@0: 
sl@0: 	case BIO_C_SHUTDOWN_WR:
sl@0: 		/* similar to shutdown(..., SHUT_WR) */
sl@0: 		b->closed = 1;
sl@0: 		ret = 1;
sl@0: 		break;
sl@0: 
sl@0: 	case BIO_C_NREAD0:
sl@0: 		/* prepare for non-copying read */
sl@0: 		ret = (long) bio_nread0(bio, ptr);
sl@0: 		break;
sl@0: 		
sl@0: 	case BIO_C_NREAD:
sl@0: 		/* non-copying read */
sl@0: 		ret = (long) bio_nread(bio, ptr, (size_t) num);
sl@0: 		break;
sl@0: 		
sl@0: 	case BIO_C_NWRITE0:
sl@0: 		/* prepare for non-copying write */
sl@0: 		ret = (long) bio_nwrite0(bio, ptr);
sl@0: 		break;
sl@0: 
sl@0: 	case BIO_C_NWRITE:
sl@0: 		/* non-copying write */
sl@0: 		ret = (long) bio_nwrite(bio, ptr, (size_t) num);
sl@0: 		break;
sl@0: 		
sl@0: 
sl@0: 	/* standard CTRL codes follow */
sl@0: 
sl@0: 	case BIO_CTRL_RESET:
sl@0: 		if (b->buf != NULL)
sl@0: 			{
sl@0: 			b->len = 0;
sl@0: 			b->offset = 0;
sl@0: 			}
sl@0: 		ret = 0;
sl@0: 		break;		
sl@0: 
sl@0: 	case BIO_CTRL_GET_CLOSE:
sl@0: 		ret = bio->shutdown;
sl@0: 		break;
sl@0: 
sl@0: 	case BIO_CTRL_SET_CLOSE:
sl@0: 		bio->shutdown = (int) num;
sl@0: 		ret = 1;
sl@0: 		break;
sl@0: 
sl@0: 	case BIO_CTRL_PENDING:
sl@0: 		if (b->peer != NULL)
sl@0: 			{
sl@0: 			struct bio_bio_st *peer_b = b->peer->ptr;
sl@0: 			
sl@0: 			ret = (long) peer_b->len;
sl@0: 			}
sl@0: 		else
sl@0: 			ret = 0;
sl@0: 		break;
sl@0: 
sl@0: 	case BIO_CTRL_WPENDING:
sl@0: 		if (b->buf != NULL)
sl@0: 			ret = (long) b->len;
sl@0: 		else
sl@0: 			ret = 0;
sl@0: 		break;
sl@0: 
sl@0: 	case BIO_CTRL_DUP:
sl@0: 		/* See BIO_dup_chain for circumstances we have to expect. */
sl@0: 		{
sl@0: 		BIO *other_bio = ptr;
sl@0: 		struct bio_bio_st *other_b;
sl@0: 		
sl@0: 		assert(other_bio != NULL);
sl@0: 		other_b = other_bio->ptr;
sl@0: 		assert(other_b != NULL);
sl@0: 		
sl@0: 		assert(other_b->buf == NULL); /* other_bio is always fresh */
sl@0: 
sl@0: 		other_b->size = b->size;
sl@0: 		}
sl@0: 
sl@0: 		ret = 1;
sl@0: 		break;
sl@0: 
sl@0: 	case BIO_CTRL_FLUSH:
sl@0: 		ret = 1;
sl@0: 		break;
sl@0: 
sl@0: 	case BIO_CTRL_EOF:
sl@0: 		{
sl@0: 		BIO *other_bio = ptr;
sl@0: 		
sl@0: 		if (other_bio)
sl@0: 			{
sl@0: 			struct bio_bio_st *other_b = other_bio->ptr;
sl@0: 			
sl@0: 			assert(other_b != NULL);
sl@0: 			ret = other_b->len == 0 && other_b->closed;
sl@0: 			}
sl@0: 		else
sl@0: 			ret = 1;
sl@0: 		}
sl@0: 		break;
sl@0: 
sl@0: 	default:
sl@0: 		ret = 0;
sl@0: 		}
sl@0: 	return ret;
sl@0: 	}
sl@0: 
sl@0: static int bio_puts(BIO *bio, const char *str)
sl@0: 	{
sl@0: 	return bio_write(bio, str, strlen(str));
sl@0: 	}
sl@0: 
sl@0: 
sl@0: static int bio_make_pair(BIO *bio1, BIO *bio2)
sl@0: 	{
sl@0: 	struct bio_bio_st *b1, *b2;
sl@0: 
sl@0: 	assert(bio1 != NULL);
sl@0: 	assert(bio2 != NULL);
sl@0: 
sl@0: 	b1 = bio1->ptr;
sl@0: 	b2 = bio2->ptr;
sl@0: 	
sl@0: 	if (b1->peer != NULL || b2->peer != NULL)
sl@0: 		{
sl@0: 		BIOerr(BIO_F_BIO_MAKE_PAIR, BIO_R_IN_USE);
sl@0: 		return 0;
sl@0: 		}
sl@0: 	
sl@0: 	if (b1->buf == NULL)
sl@0: 		{
sl@0: 		b1->buf = OPENSSL_malloc(b1->size);
sl@0: 		if (b1->buf == NULL)
sl@0: 			{
sl@0: 			BIOerr(BIO_F_BIO_MAKE_PAIR, ERR_R_MALLOC_FAILURE);
sl@0: 			return 0;
sl@0: 			}
sl@0: 		b1->len = 0;
sl@0: 		b1->offset = 0;
sl@0: 		}
sl@0: 	
sl@0: 	if (b2->buf == NULL)
sl@0: 		{
sl@0: 		b2->buf = OPENSSL_malloc(b2->size);
sl@0: 		if (b2->buf == NULL)
sl@0: 			{
sl@0: 			BIOerr(BIO_F_BIO_MAKE_PAIR, ERR_R_MALLOC_FAILURE);
sl@0: 			return 0;
sl@0: 			}
sl@0: 		b2->len = 0;
sl@0: 		b2->offset = 0;
sl@0: 		}
sl@0: 	
sl@0: 	b1->peer = bio2;
sl@0: 	b1->closed = 0;
sl@0: 	b1->request = 0;
sl@0: 	b2->peer = bio1;
sl@0: 	b2->closed = 0;
sl@0: 	b2->request = 0;
sl@0: 
sl@0: 	bio1->init = 1;
sl@0: 	bio2->init = 1;
sl@0: 
sl@0: 	return 1;
sl@0: 	}
sl@0: 
sl@0: static void bio_destroy_pair(BIO *bio)
sl@0: 	{
sl@0: 	struct bio_bio_st *b = bio->ptr;
sl@0: 
sl@0: 	if (b != NULL)
sl@0: 		{
sl@0: 		BIO *peer_bio = b->peer;
sl@0: 
sl@0: 		if (peer_bio != NULL)
sl@0: 			{
sl@0: 			struct bio_bio_st *peer_b = peer_bio->ptr;
sl@0: 
sl@0: 			assert(peer_b != NULL);
sl@0: 			assert(peer_b->peer == bio);
sl@0: 
sl@0: 			peer_b->peer = NULL;
sl@0: 			peer_bio->init = 0;
sl@0: 			assert(peer_b->buf != NULL);
sl@0: 			peer_b->len = 0;
sl@0: 			peer_b->offset = 0;
sl@0: 			
sl@0: 			b->peer = NULL;
sl@0: 			bio->init = 0;
sl@0: 			assert(b->buf != NULL);
sl@0: 			b->len = 0;
sl@0: 			b->offset = 0;
sl@0: 			}
sl@0: 		}
sl@0: 	}
sl@0:  
sl@0: 
sl@0: /* Exported convenience functions */
sl@0: EXPORT_C int BIO_new_bio_pair(BIO **bio1_p, size_t writebuf1,
sl@0: 	BIO **bio2_p, size_t writebuf2)
sl@0: 	 {
sl@0: 	 BIO *bio1 = NULL, *bio2 = NULL;
sl@0: 	 long r;
sl@0: 	 int ret = 0;
sl@0: 
sl@0: 	 bio1 = BIO_new(BIO_s_bio());
sl@0: 	 if (bio1 == NULL)
sl@0: 		 goto err;
sl@0: 	 bio2 = BIO_new(BIO_s_bio());
sl@0: 	 if (bio2 == NULL)
sl@0: 		 goto err;
sl@0: 
sl@0: 	 if (writebuf1)
sl@0: 		 {
sl@0: 		 r = BIO_set_write_buf_size(bio1, writebuf1);
sl@0: 		 if (!r)
sl@0: 			 goto err;
sl@0: 		 }
sl@0: 	 if (writebuf2)
sl@0: 		 {
sl@0: 		 r = BIO_set_write_buf_size(bio2, writebuf2);
sl@0: 		 if (!r)
sl@0: 			 goto err;
sl@0: 		 }
sl@0: 
sl@0: 	 r = BIO_make_bio_pair(bio1, bio2);
sl@0: 	 if (!r)
sl@0: 		 goto err;
sl@0: 	 ret = 1;
sl@0: 
sl@0:  err:
sl@0: 	 if (ret == 0)
sl@0: 		 {
sl@0: 		 if (bio1)
sl@0: 			 {
sl@0: 			 BIO_free(bio1);
sl@0: 			 bio1 = NULL;
sl@0: 			 }
sl@0: 		 if (bio2)
sl@0: 			 {
sl@0: 			 BIO_free(bio2);
sl@0: 			 bio2 = NULL;
sl@0: 			 }
sl@0: 		 }
sl@0: 
sl@0: 	 *bio1_p = bio1;
sl@0: 	 *bio2_p = bio2;
sl@0: 	 return ret;
sl@0: 	 }
sl@0: 
sl@0: EXPORT_C size_t BIO_ctrl_get_write_guarantee(BIO *bio)
sl@0: 	{
sl@0: 	return BIO_ctrl(bio, BIO_C_GET_WRITE_GUARANTEE, 0, NULL);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C size_t BIO_ctrl_get_read_request(BIO *bio)
sl@0: 	{
sl@0: 	return BIO_ctrl(bio, BIO_C_GET_READ_REQUEST, 0, NULL);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int BIO_ctrl_reset_read_request(BIO *bio)
sl@0: 	{
sl@0: 	return (BIO_ctrl(bio, BIO_C_RESET_READ_REQUEST, 0, NULL) != 0);
sl@0: 	}
sl@0: 
sl@0: 
sl@0: /* BIO_nread0/nread/nwrite0/nwrite are available only for BIO pairs for now
sl@0:  * (conceivably some other BIOs could allow non-copying reads and writes too.)
sl@0:  */
sl@0: EXPORT_C int BIO_nread0(BIO *bio, char **buf)
sl@0: 	{
sl@0: 	long ret;
sl@0: 
sl@0: 	if (!bio->init)
sl@0: 		{
sl@0: 		BIOerr(BIO_F_BIO_NREAD0, BIO_R_UNINITIALIZED);
sl@0: 		return -2;
sl@0: 		}
sl@0: 
sl@0: 	ret = BIO_ctrl(bio, BIO_C_NREAD0, 0, buf);
sl@0: 	if (ret > INT_MAX)
sl@0: 		return INT_MAX;
sl@0: 	else
sl@0: 		return (int) ret;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int BIO_nread(BIO *bio, char **buf, int num)
sl@0: 	{
sl@0: 	int ret;
sl@0: 
sl@0: 	if (!bio->init)
sl@0: 		{
sl@0: 		BIOerr(BIO_F_BIO_NREAD, BIO_R_UNINITIALIZED);
sl@0: 		return -2;
sl@0: 		}
sl@0: 
sl@0: 	ret = (int) BIO_ctrl(bio, BIO_C_NREAD, num, buf);
sl@0: 	if (ret > 0)
sl@0: 		bio->num_read += ret;
sl@0: 	return ret;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int BIO_nwrite0(BIO *bio, char **buf)
sl@0: 	{
sl@0: 	long ret;
sl@0: 
sl@0: 	if (!bio->init)
sl@0: 		{
sl@0: 		BIOerr(BIO_F_BIO_NWRITE0, BIO_R_UNINITIALIZED);
sl@0: 		return -2;
sl@0: 		}
sl@0: 
sl@0: 	ret = BIO_ctrl(bio, BIO_C_NWRITE0, 0, buf);
sl@0: 	if (ret > INT_MAX)
sl@0: 		return INT_MAX;
sl@0: 	else
sl@0: 		return (int) ret;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int BIO_nwrite(BIO *bio, char **buf, int num)
sl@0: 	{
sl@0: 	int ret;
sl@0: 
sl@0: 	if (!bio->init)
sl@0: 		{
sl@0: 		BIOerr(BIO_F_BIO_NWRITE, BIO_R_UNINITIALIZED);
sl@0: 		return -2;
sl@0: 		}
sl@0: 
sl@0: 	ret = BIO_ctrl(bio, BIO_C_NWRITE, num, buf);
sl@0: 	if (ret > 0)
sl@0: 		bio->num_read += ret;
sl@0: 	return ret;
sl@0: 	}