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 "internal/cryptlib.h"
  62 #include <openssl/bio.h>
  63
  64 /*
  65  * BIO_put and BIO_get both add to the digest, BIO_gets returns the digest
  66  */
  67
  68 static int nullf_write(BIO *h, const char *buf, int num);
  69 static int nullf_read(BIO *h, char *buf, int size);
  70 static int nullf_puts(BIO *h, const char *str);
  71 static int nullf_gets(BIO *h, char *str, int size);
  72 static long nullf_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  73 static int nullf_new(BIO *h);
  74 static int nullf_free(BIO *data);
  75 static long nullf_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
  76 static BIO_METHOD methods_nullf = {
  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)
 105         return (0);
 106     /*-
 107     a->ptr=NULL;
 108     a->init=0;
 109     a->flags=0;
 110     */
 111     return (1);
 112 }
 113
 114 static int nullf_read(BIO *b, char *out, int outl)
 115 {
 116     int ret = 0;
 117
 118     if (out == NULL)
 119         return (0);
 120     if (b->next_bio == NULL)
 121         return (0);
 122     ret = BIO_read(b->next_bio, out, outl);
 123     BIO_clear_retry_flags(b);
 124     BIO_copy_next_retry(b);
 125     return (ret);
 126 }
 127
 128 static int nullf_write(BIO *b, const char *in, int inl)
 129 {
 130     int ret = 0;
 131
 132     if ((in == NULL) || (inl <= 0))
 133         return (0);
 134     if (b->next_bio == NULL)
 135         return (0);
 136     ret = BIO_write(b->next_bio, in, inl);
 137     BIO_clear_retry_flags(b);
 138     BIO_copy_next_retry(b);
 139     return (ret);
 140 }
 141
 142 static long nullf_ctrl(BIO *b, int cmd, long num, void *ptr)
 143 {
 144     long ret;
 145
 146     if (b->next_bio == NULL)
 147         return (0);
 148     switch (cmd) {
 149     case BIO_C_DO_STATE_MACHINE:
 150         BIO_clear_retry_flags(b);
 151         ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 152         BIO_copy_next_retry(b);
 153         break;
 154     case BIO_CTRL_DUP:
 155         ret = 0L;
 156         break;
 157     default:
 158         ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 159     }
 160     return (ret);
 161 }
 162
 163 static long nullf_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
 164 {
 165     long ret = 1;
 166
 167     if (b->next_bio == NULL)
 168         return (0);
 169     switch (cmd) {
 170     default:
 171         ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
 172         break;
 173     }
 174     return (ret);
 175 }
 176
 177 static int nullf_gets(BIO *bp, char *buf, int size)
 178 {
 179     if (bp->next_bio == NULL)
 180         return (0);
 181     return (BIO_gets(bp->next_bio, buf, size));
 182 }
 183
 184 static int nullf_puts(BIO *bp, const char *str)
 185 {
 186     if (bp->next_bio == NULL)
 187         return (0);
 188     return (BIO_puts(bp->next_bio, str));
 189 }