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      1 /*
      2  * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
      3  *
      4  * Licensed under the Apache License 2.0 (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_local.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 const BIO_METHOD null_method = {
     21     BIO_TYPE_NULL,
     22     "NULL",
     23     bwrite_conv,
     24     null_write,
     25     bread_conv,
     26     null_read,
     27     null_puts,
     28     null_gets,
     29     null_ctrl,
     30     NULL,
     31     NULL,
     32     NULL, /* null_callback_ctrl */
     33 };
     34 
     35 const BIO_METHOD *BIO_s_null(void)
     36 {
     37     return &null_method;
     38 }
     39 
     40 static int null_read(BIO *b, char *out, int outl)
     41 {
     42     return 0;
     43 }
     44 
     45 static int null_write(BIO *b, const char *in, int inl)
     46 {
     47     return inl;
     48 }
     49 
     50 static long null_ctrl(BIO *b, int cmd, long num, void *ptr)
     51 {
     52     long ret = 1;
     53 
     54     switch (cmd) {
     55     case BIO_CTRL_RESET:
     56     case BIO_CTRL_EOF:
     57     case BIO_CTRL_SET:
     58     case BIO_CTRL_SET_CLOSE:
     59     case BIO_CTRL_FLUSH:
     60     case BIO_CTRL_DUP:
     61         ret = 1;
     62         break;
     63     case BIO_CTRL_GET_CLOSE:
     64     case BIO_CTRL_INFO:
     65     case BIO_CTRL_GET:
     66     case BIO_CTRL_PENDING:
     67     case BIO_CTRL_WPENDING:
     68     default:
     69         ret = 0;
     70         break;
     71     }
     72     return ret;
     73 }
     74 
     75 static int null_gets(BIO *bp, char *buf, int size)
     76 {
     77     return 0;
     78 }
     79 
     80 static int null_puts(BIO *bp, const char *str)
     81 {
     82     if (str == NULL)
     83         return 0;
     84     return strlen(str);
     85 }
     86