crypto/openssl/crypto/bio/bss_null.c

   1 /* crypto/bio/bss_null.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@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@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@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@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     BIO_TYPE_NULL,
  73     "NULL",
  74     null_write,
  75     null_read,
  76     null_puts,
  77     null_gets,
  78     null_ctrl,
  79     null_new,
  80     null_free,
  81     NULL,
  82 };
  83
  84 BIO_METHOD *BIO_s_null(void)
  85 {
  86     return (&null_method);
  87 }
  88
  89 static int null_new(BIO *bi)
  90 {
  91     bi->init = 1;
  92     bi->num = 0;
  93     bi->ptr = (NULL);
  94     return (1);
  95 }
  96
  97 static int null_free(BIO *a)
  98 {
  99     if (a == NULL)
 100         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     case BIO_CTRL_RESET:
 120     case BIO_CTRL_EOF:
 121     case BIO_CTRL_SET:
 122     case BIO_CTRL_SET_CLOSE:
 123     case BIO_CTRL_FLUSH:
 124     case BIO_CTRL_DUP:
 125         ret = 1;
 126         break;
 127     case BIO_CTRL_GET_CLOSE:
 128     case BIO_CTRL_INFO:
 129     case BIO_CTRL_GET:
 130     case BIO_CTRL_PENDING:
 131     case BIO_CTRL_WPENDING:
 132     default:
 133         ret = 0;
 134         break;
 135     }
 136     return (ret);
 137 }
 138
 139 static int null_gets(BIO *bp, char *buf, int size)
 140 {
 141     return (0);
 142 }
 143
 144 static int null_puts(BIO *bp, const char *str)
 145 {
 146     if (str == NULL)
 147         return (0);
 148     return (strlen(str));
 149 }