lib/libcrypto/bio/bf_null.c

   1 /* $OpenBSD: bf_null.c,v 1.12 2018/05/01 13:29:09 tb 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
  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
  76 static const BIO_METHOD methods_nullf = {
  77         .type = BIO_TYPE_NULL_FILTER,
  78         .name = "NULL filter",
  79         .bwrite = nullf_write,
  80         .bread = nullf_read,
  81         .bputs = nullf_puts,
  82         .bgets = nullf_gets,
  83         .ctrl = nullf_ctrl,
  84         .create = nullf_new,
  85         .destroy = nullf_free,
  86         .callback_ctrl = nullf_callback_ctrl
  87 };
  88
  89 const BIO_METHOD *
  90 BIO_f_null(void)
  91 {
  92         return (&methods_nullf);
  93 }
  94
  95 static int
  96 nullf_new(BIO *bi)
  97 {
  98         bi->init = 1;
  99         bi->ptr = NULL;
 100         bi->flags = 0;
 101         return (1);
 102 }
 103
 104 static int
 105 nullf_free(BIO *a)
 106 {
 107         if (a == NULL)
 108                 return (0);
 109 /*      a->ptr=NULL;
 110         a->init=0;
 111         a->flags=0;*/
 112         return (1);
 113 }
 114
 115 static int
 116 nullf_read(BIO *b, char *out, int outl)
 117 {
 118         int ret = 0;
 119
 120         if (out == NULL)
 121                 return (0);
 122         if (b->next_bio == NULL)
 123                 return (0);
 124         ret = BIO_read(b->next_bio, out, outl);
 125         BIO_clear_retry_flags(b);
 126         BIO_copy_next_retry(b);
 127         return (ret);
 128 }
 129
 130 static int
 131 nullf_write(BIO *b, const char *in, int inl)
 132 {
 133         int ret = 0;
 134
 135         if ((in == NULL) || (inl <= 0))
 136                 return (0);
 137         if (b->next_bio == NULL)
 138                 return (0);
 139         ret = BIO_write(b->next_bio, in, inl);
 140         BIO_clear_retry_flags(b);
 141         BIO_copy_next_retry(b);
 142         return (ret);
 143 }
 144
 145 static long
 146 nullf_ctrl(BIO *b, int cmd, long num, void *ptr)
 147 {
 148         long ret;
 149
 150         if (b->next_bio == NULL)
 151                 return (0);
 152         switch (cmd) {
 153         case BIO_C_DO_STATE_MACHINE:
 154                 BIO_clear_retry_flags(b);
 155                 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 156                 BIO_copy_next_retry(b);
 157                 break;
 158         case BIO_CTRL_DUP:
 159                 ret = 0L;
 160                 break;
 161         default:
 162                 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 163         }
 164         return (ret);
 165 }
 166
 167 static long
 168 nullf_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
 169 {
 170         long ret = 1;
 171
 172         if (b->next_bio == NULL)
 173                 return (0);
 174         switch (cmd) {
 175         default:
 176                 ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
 177                 break;
 178         }
 179         return (ret);
 180 }
 181
 182 static int
 183 nullf_gets(BIO *bp, char *buf, int size)
 184 {
 185         if (bp->next_bio == NULL)
 186                 return (0);
 187         return (BIO_gets(bp->next_bio, buf, size));
 188 }
 189
 190 static int
 191 nullf_puts(BIO *bp, const char *str)
 192 {
 193         if (bp->next_bio == NULL)
 194                 return (0);
 195         return (BIO_puts(bp->next_bio, str));
 196 }