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 "bio.h"
  63
  64 #ifndef NOPROTO
  65 static int null_write(BIO *h,char *buf,int num);
  66 static int null_read(BIO *h,char *buf,int size);
  67 static int null_puts(BIO *h,char *str);
  68 static int null_gets(BIO *h,char *str,int size);
  69 static long null_ctrl(BIO *h,int cmd,long arg1,char *arg2);
  70 static int null_new(BIO *h);
  71 static int null_free(BIO *data);
  72 #else
  73 static int null_write();
  74 static int null_read();
  75 static int null_puts();
  76 static int null_gets();
  77 static long null_ctrl();
  78 static int null_new();
  79 static int null_free();
  80 #endif
  81
  82 static BIO_METHOD null_method=
  83         {
  84         BIO_TYPE_NULL,
  85         "NULL",
  86         null_write,
  87         null_read,
  88         null_puts,
  89         null_gets,
  90         null_ctrl,
  91         null_new,
  92         null_free,
  93         };
  94
  95 BIO_METHOD *BIO_s_null(void)
  96         {
  97         return(&null_method);
  98         }
  99
 100 static int null_new(BIO *bi)
 101         {
 102         bi->init=1;
 103         bi->num=0;
 104         bi->ptr=(NULL);
 105         return(1);
 106         }
 107
 108 static int null_free(BIO *a)
 109         {
 110         if (a == NULL) return(0);
 111         return(1);
 112         }
 113
 114 static int null_read(BIO *b, char *out, int outl)
 115         {
 116         return(0);
 117         }
 118
 119 static int null_write(BIO *b, char *in, int inl)
 120         {
 121         return(inl);
 122         }
 123
 124 static long null_ctrl(BIO *b, int cmd, long num, char *ptr)
 125         {
 126         long ret=1;
 127
 128         switch (cmd)
 129                 {
 130         case BIO_CTRL_RESET:
 131         case BIO_CTRL_EOF:
 132         case BIO_CTRL_SET:
 133         case BIO_CTRL_SET_CLOSE:
 134         case BIO_CTRL_FLUSH:
 135         case BIO_CTRL_DUP:
 136                 ret=1;
 137                 break;
 138         case BIO_CTRL_GET_CLOSE:
 139         case BIO_CTRL_INFO:
 140         case BIO_CTRL_GET:
 141         case BIO_CTRL_PENDING:
 142         case BIO_CTRL_WPENDING:
 143         default:
 144                 ret=0;
 145                 break;
 146                 }
 147         return(ret);
 148         }
 149
 150 static int null_gets(BIO *bp, char *buf, int size)
 151         {
 152         return(0);
 153         }
 154
 155 static int null_puts(BIO *bp, char *str)
 156         {
 157         if (str == NULL) return(0);
 158         return(strlen(str));
 159         }
 160