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
BIO_s_null(void)35 const BIO_METHOD *BIO_s_null(void)
36 {
37 return &null_method;
38 }
39
null_read(BIO * b,char * out,int outl)40 static int null_read(BIO *b, char *out, int outl)
41 {
42 return 0;
43 }
44
null_write(BIO * b,const char * in,int inl)45 static int null_write(BIO *b, const char *in, int inl)
46 {
47 return inl;
48 }
49
null_ctrl(BIO * b,int cmd,long num,void * ptr)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
null_gets(BIO * bp,char * buf,int size)75 static int null_gets(BIO *bp, char *buf, int size)
76 {
77 return 0;
78 }
79
null_puts(BIO * bp,const char * str)80 static int null_puts(BIO *bp, const char *str)
81 {
82 if (str == NULL)
83 return 0;
84 return strlen(str);
85 }
86
