1/*
2 * Copyright 1995-2018 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/*
16 * BIO_put and BIO_get both add to the digest, BIO_gets returns the digest
17 */
18
19static int nullf_write(BIO *h, const char *buf, int num);
20static int nullf_read(BIO *h, char *buf, int size);
21static int nullf_puts(BIO *h, const char *str);
22static int nullf_gets(BIO *h, char *str, int size);
23static long nullf_ctrl(BIO *h, int cmd, long arg1, void *arg2);
24static long nullf_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);
25static const BIO_METHOD methods_nullf = {
26 BIO_TYPE_NULL_FILTER,
27 "NULL filter",
28 /* TODO: Convert to new style write function */
29 bwrite_conv,
30 nullf_write,
31 /* TODO: Convert to new style read function */
32 bread_conv,
33 nullf_read,
34 nullf_puts,
35 nullf_gets,
36 nullf_ctrl,
37 NULL,
38 NULL,
39 nullf_callback_ctrl,
40};
41
42const BIO_METHOD *BIO_f_null(void)
43{
44 return &methods_nullf;
45}
46
47static int nullf_read(BIO *b, char *out, int outl)
48{
49 int ret = 0;
50
51 if (out == NULL)
52 return 0;
53 if (b->next_bio == NULL)
54 return 0;
55 ret = BIO_read(b->next_bio, out, outl);
56 BIO_clear_retry_flags(b);
57 BIO_copy_next_retry(b);
58 return ret;
59}
60
61static int nullf_write(BIO *b, const char *in, int inl)
62{
63 int ret = 0;
64
65 if ((in == NULL) || (inl <= 0))
66 return 0;
67 if (b->next_bio == NULL)
68 return 0;
69 ret = BIO_write(b->next_bio, in, inl);
70 BIO_clear_retry_flags(b);
71 BIO_copy_next_retry(b);
72 return ret;
73}
74
75static long nullf_ctrl(BIO *b, int cmd, long num, void *ptr)
76{
77 long ret;
78
79 if (b->next_bio == NULL)
80 return 0;
81 switch (cmd) {
82 case BIO_C_DO_STATE_MACHINE:
83 BIO_clear_retry_flags(b);
84 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
85 BIO_copy_next_retry(b);
86 break;
87 case BIO_CTRL_DUP:
88 ret = 0L;
89 break;
90 default:
91 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
92 }
93 return ret;
94}
95
96static long nullf_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
97{
98 long ret = 1;
99
100 if (b->next_bio == NULL)
101 return 0;
102 switch (cmd) {
103 default:
104 ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
105 break;
106 }
107 return ret;
108}
109
110static int nullf_gets(BIO *bp, char *buf, int size)
111{
112 if (bp->next_bio == NULL)
113 return 0;
114 return BIO_gets(bp->next_bio, buf, size);
115}
116
117static int nullf_puts(BIO *bp, const char *str)
118{
119 if (bp->next_bio == NULL)
120 return 0;
121 return BIO_puts(bp->next_bio, str);
122}
123