release/src/router/openssl/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 /*      a->ptr=NULL;
 106         a->init=0;
 107         a->flags=0;*/
 108         return(1);
 109         }
 110
 111 static int nullf_read(BIO *b, char *out, int outl)
 112         {
 113         int ret=0;
 114
 115         if (out == NULL) return(0);
 116         if (b->next_bio == NULL) return(0);
 117         ret=BIO_read(b->next_bio,out,outl);
 118         BIO_clear_retry_flags(b);
 119         BIO_copy_next_retry(b);
 120         return(ret);
 121         }
 122
 123 static int nullf_write(BIO *b, const char *in, int inl)
 124         {
 125         int ret=0;
 126
 127         if ((in == NULL) || (inl <= 0)) return(0);
 128         if (b->next_bio == NULL) return(0);
 129         ret=BIO_write(b->next_bio,in,inl);
 130         BIO_clear_retry_flags(b);
 131         BIO_copy_next_retry(b);
 132         return(ret);
 133         }
 134
 135 static long nullf_ctrl(BIO *b, int cmd, long num, void *ptr)
 136         {
 137         long ret;
 138
 139         if (b->next_bio == NULL) return(0);
 140         switch(cmd)
 141                 {
 142         case BIO_C_DO_STATE_MACHINE:
 143                 BIO_clear_retry_flags(b);
 144                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 145                 BIO_copy_next_retry(b);
 146                 break;
 147         case BIO_CTRL_DUP:
 148                 ret=0L;
 149                 break;
 150         default:
 151                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 152                 }
 153         return(ret);
 154         }
 155
 156 static long nullf_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
 157         {
 158         long ret=1;
 159
 160         if (b->next_bio == NULL) return(0);
 161         switch (cmd)
 162                 {
 163         default:
 164                 ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
 165                 break;
 166                 }
 167         return(ret);
 168         }
 169
 170 static int nullf_gets(BIO *bp, char *buf, int size)
 171         {
 172         if (bp->next_bio == NULL) return(0);
 173         return(BIO_gets(bp->next_bio,buf,size));
 174         }
 175
 176
 177 static int nullf_puts(BIO *bp, const char *str)
 178         {
 179         if (bp->next_bio == NULL) return(0);
 180         return(BIO_puts(bp->next_bio,str));
 181         }
 182
 183