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 /*
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 long nullf_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);
25 static const BIO_METHOD methods_nullf = {
26 BIO_TYPE_NULL_FILTER,
27 "NULL filter",
28 bwrite_conv,
29 nullf_write,
30 bread_conv,
31 nullf_read,
32 nullf_puts,
33 nullf_gets,
34 nullf_ctrl,
35 NULL,
36 NULL,
37 nullf_callback_ctrl,
38 };
39
BIO_f_null(void)40 const BIO_METHOD *BIO_f_null(void)
41 {
42 return &methods_nullf;
43 }
44
nullf_read(BIO * b,char * out,int outl)45 static int nullf_read(BIO *b, char *out, int outl)
46 {
47 int ret = 0;
48
49 if (out == NULL)
50 return 0;
51 if (b->next_bio == NULL)
52 return 0;
53 ret = BIO_read(b->next_bio, out, outl);
54 BIO_clear_retry_flags(b);
55 BIO_copy_next_retry(b);
56 return ret;
57 }
58
nullf_write(BIO * b,const char * in,int inl)59 static int nullf_write(BIO *b, const char *in, int inl)
60 {
61 int ret = 0;
62
63 if ((in == NULL) || (inl <= 0))
64 return 0;
65 if (b->next_bio == NULL)
66 return 0;
67 ret = BIO_write(b->next_bio, in, inl);
68 BIO_clear_retry_flags(b);
69 BIO_copy_next_retry(b);
70 return ret;
71 }
72
nullf_ctrl(BIO * b,int cmd,long num,void * ptr)73 static long nullf_ctrl(BIO *b, int cmd, long num, void *ptr)
74 {
75 long ret;
76
77 if (b->next_bio == NULL)
78 return 0;
79 switch (cmd) {
80 case BIO_C_DO_STATE_MACHINE:
81 BIO_clear_retry_flags(b);
82 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
83 BIO_copy_next_retry(b);
84 break;
85 case BIO_CTRL_DUP:
86 ret = 0L;
87 break;
88 default:
89 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
90 }
91 return ret;
92 }
93
nullf_callback_ctrl(BIO * b,int cmd,BIO_info_cb * fp)94 static long nullf_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
95 {
96 if (b->next_bio == NULL)
97 return 0;
98 return BIO_callback_ctrl(b->next_bio, cmd, fp);
99 }
100
nullf_gets(BIO * bp,char * buf,int size)101 static int nullf_gets(BIO *bp, char *buf, int size)
102 {
103 if (bp->next_bio == NULL)
104 return 0;
105 return BIO_gets(bp->next_bio, buf, size);
106 }
107
nullf_puts(BIO * bp,const char * str)108 static int nullf_puts(BIO *bp, const char *str)
109 {
110 if (bp->next_bio == NULL)
111 return 0;
112 return BIO_puts(bp->next_bio, str);
113 }
114
