sl@0: /* crypto/bio/bf_null.c */
sl@0: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * This package is an SSL implementation written
sl@0:  * by Eric Young (eay@cryptsoft.com).
sl@0:  * The implementation was written so as to conform with Netscapes SSL.
sl@0:  * 
sl@0:  * This library is free for commercial and non-commercial use as long as
sl@0:  * the following conditions are aheared to.  The following conditions
sl@0:  * apply to all code found in this distribution, be it the RC4, RSA,
sl@0:  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
sl@0:  * included with this distribution is covered by the same copyright terms
sl@0:  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
sl@0:  * 
sl@0:  * Copyright remains Eric Young's, and as such any Copyright notices in
sl@0:  * the code are not to be removed.
sl@0:  * If this package is used in a product, Eric Young should be given attribution
sl@0:  * as the author of the parts of the library used.
sl@0:  * This can be in the form of a textual message at program startup or
sl@0:  * in documentation (online or textual) provided with the package.
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:  * 1. Redistributions of source code must retain the copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 3. All advertising materials mentioning features or use of this software
sl@0:  *    must display the following acknowledgement:
sl@0:  *    "This product includes cryptographic software written by
sl@0:  *     Eric Young (eay@cryptsoft.com)"
sl@0:  *    The word 'cryptographic' can be left out if the rouines from the library
sl@0:  *    being used are not cryptographic related :-).
sl@0:  * 4. If you include any Windows specific code (or a derivative thereof) from 
sl@0:  *    the apps directory (application code) you must include an acknowledgement:
sl@0:  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
sl@0:  * 
sl@0:  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
sl@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
sl@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
sl@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
sl@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
sl@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
sl@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
sl@0:  * SUCH DAMAGE.
sl@0:  * 
sl@0:  * The licence and distribution terms for any publically available version or
sl@0:  * derivative of this code cannot be changed.  i.e. this code cannot simply be
sl@0:  * copied and put under another distribution licence
sl@0:  * [including the GNU Public Licence.]
sl@0:  */
sl@0: 
sl@0: #include <stdio.h>
sl@0: #include <errno.h>
sl@0: #include "cryptlib.h"
sl@0: #include <openssl/bio.h>
sl@0: 
sl@0: /* BIO_put and BIO_get both add to the digest,
sl@0:  * BIO_gets returns the digest */
sl@0: 
sl@0: static int nullf_write(BIO *h, const char *buf, int num);
sl@0: static int nullf_read(BIO *h, char *buf, int size);
sl@0: static int nullf_puts(BIO *h, const char *str);
sl@0: static int nullf_gets(BIO *h, char *str, int size);
sl@0: static long nullf_ctrl(BIO *h, int cmd, long arg1, void *arg2);
sl@0: static int nullf_new(BIO *h);
sl@0: static int nullf_free(BIO *data);
sl@0: static long nullf_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
sl@0: static BIO_METHOD methods_nullf=
sl@0: 	{
sl@0: 	BIO_TYPE_NULL_FILTER,
sl@0: 	"NULL filter",
sl@0: 	nullf_write,
sl@0: 	nullf_read,
sl@0: 	nullf_puts,
sl@0: 	nullf_gets,
sl@0: 	nullf_ctrl,
sl@0: 	nullf_new,
sl@0: 	nullf_free,
sl@0: 	nullf_callback_ctrl,
sl@0: 	};
sl@0: 
sl@0: EXPORT_C BIO_METHOD *BIO_f_null(void)
sl@0: 	{
sl@0: 	return(&methods_nullf);
sl@0: 	}
sl@0: 
sl@0: static int nullf_new(BIO *bi)
sl@0: 	{
sl@0: 	bi->init=1;
sl@0: 	bi->ptr=NULL;
sl@0: 	bi->flags=0;
sl@0: 	return(1);
sl@0: 	}
sl@0: 
sl@0: static int nullf_free(BIO *a)
sl@0: 	{
sl@0: 	if (a == NULL) return(0);
sl@0: /*	a->ptr=NULL;
sl@0: 	a->init=0;
sl@0: 	a->flags=0;*/
sl@0: 	return(1);
sl@0: 	}
sl@0: 	
sl@0: static int nullf_read(BIO *b, char *out, int outl)
sl@0: 	{
sl@0: 	int ret=0;
sl@0:  
sl@0: 	if (out == NULL) return(0);
sl@0: 	if (b->next_bio == NULL) return(0);
sl@0: 	ret=BIO_read(b->next_bio,out,outl);
sl@0: 	BIO_clear_retry_flags(b);
sl@0: 	BIO_copy_next_retry(b);
sl@0: 	return(ret);
sl@0: 	}
sl@0: 
sl@0: static int nullf_write(BIO *b, const char *in, int inl)
sl@0: 	{
sl@0: 	int ret=0;
sl@0: 
sl@0: 	if ((in == NULL) || (inl <= 0)) return(0);
sl@0: 	if (b->next_bio == NULL) return(0);
sl@0: 	ret=BIO_write(b->next_bio,in,inl);
sl@0: 	BIO_clear_retry_flags(b);
sl@0: 	BIO_copy_next_retry(b);
sl@0: 	return(ret);
sl@0: 	}
sl@0: 
sl@0: static long nullf_ctrl(BIO *b, int cmd, long num, void *ptr)
sl@0: 	{
sl@0: 	long ret;
sl@0: 
sl@0: 	if (b->next_bio == NULL) return(0);
sl@0: 	switch(cmd)
sl@0: 		{
sl@0:         case BIO_C_DO_STATE_MACHINE:
sl@0: 		BIO_clear_retry_flags(b);
sl@0: 		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
sl@0: 		BIO_copy_next_retry(b);
sl@0: 		break;
sl@0: 	case BIO_CTRL_DUP:
sl@0: 		ret=0L;
sl@0: 		break;
sl@0: 	default:
sl@0: 		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
sl@0: 		}
sl@0: 	return(ret);
sl@0: 	}
sl@0: 
sl@0: static long nullf_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
sl@0: 	{
sl@0: 	long ret=1;
sl@0: 
sl@0: 	if (b->next_bio == NULL) return(0);
sl@0: 	switch (cmd)
sl@0: 		{
sl@0: 	default:
sl@0: 		ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
sl@0: 		break;
sl@0: 		}
sl@0: 	return(ret);
sl@0: 	}
sl@0: 
sl@0: static int nullf_gets(BIO *bp, char *buf, int size)
sl@0: 	{
sl@0: 	if (bp->next_bio == NULL) return(0);
sl@0: 	return(BIO_gets(bp->next_bio,buf,size));
sl@0: 	}
sl@0: 
sl@0: 
sl@0: static int nullf_puts(BIO *bp, const char *str)
sl@0: 	{
sl@0: 	if (bp->next_bio == NULL) return(0);
sl@0: 	return(BIO_puts(bp->next_bio,str));
sl@0: 	}
sl@0: 
sl@0: