crypto/bio/bss_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 static int null_write(BIO *h, const char *buf, int num);
  16 static int null_read(BIO *h, char *buf, int size);
  17 static int null_puts(BIO *h, const char *str);
  18 static int null_gets(BIO *h, char *str, int size);
  19 static long null_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  20 static int null_new(BIO *h);
  21 static int null_free(BIO *data);
  22 static const BIO_METHOD null_method = {
  23     BIO_TYPE_NULL,
  24     "NULL",
  25     null_write,
  26     /* TODO: Convert to new style read function */
  27     bread_conv,
  28     null_read,
  29     null_puts,
  30     null_gets,
  31     null_ctrl,
  32     null_new,
  33     null_free,
  34     NULL,
  35 };
  36
  37 const BIO_METHOD *BIO_s_null(void)
  38 {
  39     return (&null_method);
  40 }
  41
  42 static int null_new(BIO *bi)
  43 {
  44     bi->init = 1;
  45     bi->num = 0;
  46     bi->ptr = (NULL);
  47     return (1);
  48 }
  49
  50 static int null_free(BIO *a)
  51 {
  52     if (a == NULL)
  53         return (0);
  54     return (1);
  55 }
  56
  57 static int null_read(BIO *b, char *out, int outl)
  58 {
  59     return (0);
  60 }
  61
  62 static int null_write(BIO *b, const char *in, int inl)
  63 {
  64     return (inl);
  65 }
  66
  67 static long null_ctrl(BIO *b, int cmd, long num, void *ptr)
  68 {
  69     long ret = 1;
  70
  71     switch (cmd) {
  72     case BIO_CTRL_RESET:
  73     case BIO_CTRL_EOF:
  74     case BIO_CTRL_SET:
  75     case BIO_CTRL_SET_CLOSE:
  76     case BIO_CTRL_FLUSH:
  77     case BIO_CTRL_DUP:
  78         ret = 1;
  79         break;
  80     case BIO_CTRL_GET_CLOSE:
  81     case BIO_CTRL_INFO:
  82     case BIO_CTRL_GET:
  83     case BIO_CTRL_PENDING:
  84     case BIO_CTRL_WPENDING:
  85     default:
  86         ret = 0;
  87         break;
  88     }
  89     return (ret);
  90 }
  91
  92 static int null_gets(BIO *bp, char *buf, int size)
  93 {
  94     return (0);
  95 }
  96
  97 static int null_puts(BIO *bp, const char *str)
  98 {
  99     if (str == NULL)
 100         return (0);
 101     return (strlen(str));
 102 }