crypto/bio/bf_null.c

   1 /* crypto/bio/bf_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 /* BIO_put and BIO_get both add to the digest,
  65  * BIO_gets returns the digest */
  66
  67 static int nullf_write(BIO *h, const char *buf, int num);
  68 static int nullf_read(BIO *h, char *buf, int size);
  69 static int nullf_puts(BIO *h, const char *str);
  70 static int nullf_gets(BIO *h, char *str, int size);
  71 static long nullf_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  72 static int nullf_new(BIO *h);
  73 static int nullf_free(BIO *data);
  74 static long nullf_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
  75 static BIO_METHOD methods_nullf=
  76         {
  77         BIO_TYPE_NULL_FILTER,
  78         "NULL filter",
  79         nullf_write,
  80         nullf_read,
  81         nullf_puts,
  82         nullf_gets,
  83         nullf_ctrl,
  84         nullf_new,
  85         nullf_free,
  86         nullf_callback_ctrl,
  87         };
  88
  89 BIO_METHOD *BIO_f_null(void)
  90         {
  91         return(&methods_nullf);
  92         }
  93
  94 static int nullf_new(BIO *bi)
  95         {
  96         bi->init=1;
  97         bi->ptr=NULL;
  98         bi->flags=0;
  99         return(1);
 100         }
 101
 102 static int nullf_free(BIO *a)
 103         {
 104         if (a == NULL) return(0);
 105         /*-
 106         a->ptr=NULL;
 107         a->init=0;
 108         a->flags=0;
 109         */
 110         return(1);
 111         }
 112
 113 static int nullf_read(BIO *b, char *out, int outl)
 114         {
 115         int ret=0;
 116
 117         if (out == NULL) return(0);
 118         if (b->next_bio == NULL) return(0);
 119         ret=BIO_read(b->next_bio,out,outl);
 120         BIO_clear_retry_flags(b);
 121         BIO_copy_next_retry(b);
 122         return(ret);
 123         }
 124
 125 static int nullf_write(BIO *b, const char *in, int inl)
 126         {
 127         int ret=0;
 128
 129         if ((in == NULL) || (inl <= 0)) return(0);
 130         if (b->next_bio == NULL) return(0);
 131         ret=BIO_write(b->next_bio,in,inl);
 132         BIO_clear_retry_flags(b);
 133         BIO_copy_next_retry(b);
 134         return(ret);
 135         }
 136
 137 static long nullf_ctrl(BIO *b, int cmd, long num, void *ptr)
 138         {
 139         long ret;
 140
 141         if (b->next_bio == NULL) return(0);
 142         switch(cmd)
 143                 {
 144         case BIO_C_DO_STATE_MACHINE:
 145                 BIO_clear_retry_flags(b);
 146                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 147                 BIO_copy_next_retry(b);
 148                 break;
 149         case BIO_CTRL_DUP:
 150                 ret=0L;
 151                 break;
 152         default:
 153                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 154                 }
 155         return(ret);
 156         }
 157
 158 static long nullf_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
 159         {
 160         long ret=1;
 161
 162         if (b->next_bio == NULL) return(0);
 163         switch (cmd)
 164                 {
 165         default:
 166                 ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
 167                 break;
 168                 }
 169         return(ret);
 170         }
 171
 172 static int nullf_gets(BIO *bp, char *buf, int size)
 173         {
 174         if (bp->next_bio == NULL) return(0);
 175         return(BIO_gets(bp->next_bio,buf,size));
 176         }
 177
 178
 179 static int nullf_puts(BIO *bp, const char *str)
 180         {
 181         if (bp->next_bio == NULL) return(0);
 182         return(BIO_puts(bp->next_bio,str));
 183         }
 184
 185