crypto/bio/bf_null.c

   1 /*
   2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include <errno.h>
  12 #include "bio_lcl.h"
  13 #include "internal/cryptlib.h"
  14
  15 /*
  16  * BIO_put and BIO_get both add to the digest, BIO_gets returns the digest
  17  */
  18
  19 static int nullf_write(BIO *h, const char *buf, int num);
  20 static int nullf_read(BIO *h, char *buf, int size);
  21 static int nullf_puts(BIO *h, const char *str);
  22 static int nullf_gets(BIO *h, char *str, int size);
  23 static long nullf_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  24 static int nullf_new(BIO *h);
  25 static int nullf_free(BIO *data);
  26 static long nullf_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
  27 static const BIO_METHOD methods_nullf = {
  28     BIO_TYPE_NULL_FILTER,
  29     "NULL filter",
  30     /* TODO: Convert to new style write function */
  31     bwrite_conv,
  32     nullf_write,
  33     /* TODO: Convert to new style read function */
  34     bread_conv,
  35     nullf_read,
  36     nullf_puts,
  37     nullf_gets,
  38     nullf_ctrl,
  39     nullf_new,
  40     nullf_free,
  41     nullf_callback_ctrl,
  42 };
  43
  44 const BIO_METHOD *BIO_f_null(void)
  45 {
  46     return (&methods_nullf);
  47 }
  48
  49 static int nullf_new(BIO *bi)
  50 {
  51     bi->init = 1;
  52     bi->ptr = NULL;
  53     bi->flags = 0;
  54     return 1;
  55 }
  56
  57 static int nullf_free(BIO *a)
  58 {
  59     if (a == NULL)
  60         return (0);
  61     /*-
  62     a->ptr=NULL;
  63     a->init=0;
  64     a->flags=0;
  65     */
  66     return 1;
  67 }
  68
  69 static int nullf_read(BIO *b, char *out, int outl)
  70 {
  71     int ret = 0;
  72
  73     if (out == NULL)
  74         return (0);
  75     if (b->next_bio == NULL)
  76         return (0);
  77     ret = BIO_read(b->next_bio, out, outl);
  78     BIO_clear_retry_flags(b);
  79     BIO_copy_next_retry(b);
  80     return (ret);
  81 }
  82
  83 static int nullf_write(BIO *b, const char *in, int inl)
  84 {
  85     int ret = 0;
  86
  87     if ((in == NULL) || (inl <= 0))
  88         return (0);
  89     if (b->next_bio == NULL)
  90         return (0);
  91     ret = BIO_write(b->next_bio, in, inl);
  92     BIO_clear_retry_flags(b);
  93     BIO_copy_next_retry(b);
  94     return (ret);
  95 }
  96
  97 static long nullf_ctrl(BIO *b, int cmd, long num, void *ptr)
  98 {
  99     long ret;
 100
 101     if (b->next_bio == NULL)
 102         return (0);
 103     switch (cmd) {
 104     case BIO_C_DO_STATE_MACHINE:
 105         BIO_clear_retry_flags(b);
 106         ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 107         BIO_copy_next_retry(b);
 108         break;
 109     case BIO_CTRL_DUP:
 110         ret = 0L;
 111         break;
 112     default:
 113         ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 114     }
 115     return (ret);
 116 }
 117
 118 static long nullf_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
 119 {
 120     long ret = 1;
 121
 122     if (b->next_bio == NULL)
 123         return (0);
 124     switch (cmd) {
 125     default:
 126         ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
 127         break;
 128     }
 129     return (ret);
 130 }
 131
 132 static int nullf_gets(BIO *bp, char *buf, int size)
 133 {
 134     if (bp->next_bio == NULL)
 135         return (0);
 136     return (BIO_gets(bp->next_bio, buf, size));
 137 }
 138
 139 static int nullf_puts(BIO *bp, const char *str)
 140 {
 141     if (bp->next_bio == NULL)
 142         return (0);
 143     return (BIO_puts(bp->next_bio, str));
 144 }