lib/libcrypto/bio/bss_null.c

   1 /* $OpenBSD: bss_null.c,v 1.10 2014/07/11 08:44:47 jsing Exp $ */
   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 <errno.h>
  60 #include <stdio.h>
  61 #include <string.h>
  62
  63 #include <openssl/bio.h>
  64
  65 static int null_write(BIO *h, const char *buf, int num);
  66 static int null_read(BIO *h, char *buf, int size);
  67 static int null_puts(BIO *h, const char *str);
  68 static int null_gets(BIO *h, char *str, int size);
  69 static long null_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  70 static int null_new(BIO *h);
  71 static int null_free(BIO *data);
  72
  73 static BIO_METHOD null_method = {
  74         .type = BIO_TYPE_NULL,
  75         .name = "NULL",
  76         .bwrite = null_write,
  77         .bread = null_read,
  78         .bputs = null_puts,
  79         .bgets = null_gets,
  80         .ctrl = null_ctrl,
  81         .create = null_new,
  82         .destroy = null_free
  83 };
  84
  85 BIO_METHOD *
  86 BIO_s_null(void)
  87 {
  88         return (&null_method);
  89 }
  90
  91 static int
  92 null_new(BIO *bi)
  93 {
  94         bi->init = 1;
  95         bi->num = 0;
  96         bi->ptr = (NULL);
  97         return (1);
  98 }
  99
 100 static int
 101 null_free(BIO *a)
 102 {
 103         if (a == NULL)
 104                 return (0);
 105         return (1);
 106 }
 107
 108 static int
 109 null_read(BIO *b, char *out, int outl)
 110 {
 111         return (0);
 112 }
 113
 114 static int
 115 null_write(BIO *b, const char *in, int inl)
 116 {
 117         return (inl);
 118 }
 119
 120 static long
 121 null_ctrl(BIO *b, int cmd, long num, void *ptr)
 122 {
 123         long ret = 1;
 124
 125         switch (cmd) {
 126         case BIO_CTRL_RESET:
 127         case BIO_CTRL_EOF:
 128         case BIO_CTRL_SET:
 129         case BIO_CTRL_SET_CLOSE:
 130         case BIO_CTRL_FLUSH:
 131         case BIO_CTRL_DUP:
 132                 ret = 1;
 133                 break;
 134         case BIO_CTRL_GET_CLOSE:
 135         case BIO_CTRL_INFO:
 136         case BIO_CTRL_GET:
 137         case BIO_CTRL_PENDING:
 138         case BIO_CTRL_WPENDING:
 139         default:
 140                 ret = 0;
 141                 break;
 142         }
 143         return (ret);
 144 }
 145
 146 static int
 147 null_gets(BIO *bp, char *buf, int size)
 148 {
 149         return (0);
 150 }
 151
 152 static int
 153 null_puts(BIO *bp, const char *str)
 154 {
 155         if (str == NULL)
 156                 return (0);
 157         return (strlen(str));
 158 }