xref: /openssl/crypto/bio/bf_null.c (revision 38fc02a7)
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