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      1 /* crypto/bio/bss_null.c */
      2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com)
      3  * All rights reserved.
      4  *
      5  * This package is an SSL implementation written
      6  * by Eric Young (eay (at) cryptsoft.com).
      7  * The implementation was written so as to conform with Netscapes SSL.
      8  *
      9  * This library is free for commercial and non-commercial use as long as
     10  * the following conditions are aheared to.  The following conditions
     11  * apply to all code found in this distribution, be it the RC4, RSA,
     12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
     13  * included with this distribution is covered by the same copyright terms
     14  * except that the holder is Tim Hudson (tjh (at) cryptsoft.com).
     15  *
     16  * Copyright remains Eric Young's, and as such any Copyright notices in
     17  * the code are not to be removed.
     18  * If this package is used in a product, Eric Young should be given attribution
     19  * as the author of the parts of the library used.
     20  * This can be in the form of a textual message at program startup or
     21  * in documentation (online or textual) provided with the package.
     22  *
     23  * Redistribution and use in source and binary forms, with or without
     24  * modification, are permitted provided that the following conditions
     25  * are met:
     26  * 1. Redistributions of source code must retain the copyright
     27  *    notice, this list of conditions and the following disclaimer.
     28  * 2. Redistributions in binary form must reproduce the above copyright
     29  *    notice, this list of conditions and the following disclaimer in the
     30  *    documentation and/or other materials provided with the distribution.
     31  * 3. All advertising materials mentioning features or use of this software
     32  *    must display the following acknowledgement:
     33  *    "This product includes cryptographic software written by
     34  *     Eric Young (eay (at) cryptsoft.com)"
     35  *    The word 'cryptographic' can be left out if the rouines from the library
     36  *    being used are not cryptographic related :-).
     37  * 4. If you include any Windows specific code (or a derivative thereof) from
     38  *    the apps directory (application code) you must include an acknowledgement:
     39  *    "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)"
     40  *
     41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
     42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     51  * SUCH DAMAGE.
     52  *
     53  * The licence and distribution terms for any publically available version or
     54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
     55  * copied and put under another distribution licence
     56  * [including the GNU Public Licence.]
     57  */
     58 
     59 #include <stdio.h>
     60 #include <errno.h>
     61 #include "cryptlib.h"
     62 #include <openssl/bio.h>
     63 
     64 static int null_write(BIO *h, const char *buf, int num);
     65 static int null_read(BIO *h, char *buf, int size);
     66 static int null_puts(BIO *h, const char *str);
     67 static int null_gets(BIO *h, char *str, int size);
     68 static long null_ctrl(BIO *h, int cmd, long arg1, void *arg2);
     69 static int null_new(BIO *h);
     70 static int null_free(BIO *data);
     71 static BIO_METHOD null_method=
     72 	{
     73 	BIO_TYPE_NULL,
     74 	"NULL",
     75 	null_write,
     76 	null_read,
     77 	null_puts,
     78 	null_gets,
     79 	null_ctrl,
     80 	null_new,
     81 	null_free,
     82 	NULL,
     83 	};
     84 
     85 BIO_METHOD *BIO_s_null(void)
     86 	{
     87 	return(&null_method);
     88 	}
     89 
     90 static int null_new(BIO *bi)
     91 	{
     92 	bi->init=1;
     93 	bi->num=0;
     94 	bi->ptr=(NULL);
     95 	return(1);
     96 	}
     97 
     98 static int null_free(BIO *a)
     99 	{
    100 	if (a == NULL) return(0);
    101 	return(1);
    102 	}
    103 
    104 static int null_read(BIO *b, char *out, int outl)
    105 	{
    106 	return(0);
    107 	}
    108 
    109 static int null_write(BIO *b, const char *in, int inl)
    110 	{
    111 	return(inl);
    112 	}
    113 
    114 static long null_ctrl(BIO *b, int cmd, long num, void *ptr)
    115 	{
    116 	long ret=1;
    117 
    118 	switch (cmd)
    119 		{
    120 	case BIO_CTRL_RESET:
    121 	case BIO_CTRL_EOF:
    122 	case BIO_CTRL_SET:
    123 	case BIO_CTRL_SET_CLOSE:
    124 	case BIO_CTRL_FLUSH:
    125 	case BIO_CTRL_DUP:
    126 		ret=1;
    127 		break;
    128 	case BIO_CTRL_GET_CLOSE:
    129 	case BIO_CTRL_INFO:
    130 	case BIO_CTRL_GET:
    131 	case BIO_CTRL_PENDING:
    132 	case BIO_CTRL_WPENDING:
    133 	default:
    134 		ret=0;
    135 		break;
    136 		}
    137 	return(ret);
    138 	}
    139 
    140 static int null_gets(BIO *bp, char *buf, int size)
    141 	{
    142 	return(0);
    143 	}
    144 
    145 static int null_puts(BIO *bp, const char *str)
    146 	{
    147 	if (str == NULL) return(0);
    148 	return(strlen(str));
    149 	}
    150 
    151