1 /* $OpenBSD: bss_null.c,v 1.13 2023/07/05 21:23:37 beck Exp $ */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59 #include <errno.h>
60 #include <stdio.h>
61 #include <string.h>
62
63 #include <openssl/bio.h>
64
65 #include "bio_local.h"
66
67 static int null_write(BIO *h, const char *buf, int num);
68 static int null_read(BIO *h, char *buf, int size);
69 static int null_puts(BIO *h, const char *str);
70 static int null_gets(BIO *h, char *str, int size);
71 static long null_ctrl(BIO *h, int cmd, long arg1, void *arg2);
72 static int null_new(BIO *h);
73 static int null_free(BIO *data);
74
75 static const BIO_METHOD null_method = {
76 .type = BIO_TYPE_NULL,
77 .name = "NULL",
78 .bwrite = null_write,
79 .bread = null_read,
80 .bputs = null_puts,
81 .bgets = null_gets,
82 .ctrl = null_ctrl,
83 .create = null_new,
84 .destroy = null_free
85 };
86
87 const BIO_METHOD *
BIO_s_null(void)88 BIO_s_null(void)
89 {
90 return (&null_method);
91 }
92 LCRYPTO_ALIAS(BIO_s_null);
93
94 static int
null_new(BIO * bi)95 null_new(BIO *bi)
96 {
97 bi->init = 1;
98 bi->num = 0;
99 bi->ptr = (NULL);
100 return (1);
101 }
102
103 static int
null_free(BIO * a)104 null_free(BIO *a)
105 {
106 if (a == NULL)
107 return (0);
108 return (1);
109 }
110
111 static int
null_read(BIO * b,char * out,int outl)112 null_read(BIO *b, char *out, int outl)
113 {
114 return (0);
115 }
116
117 static int
null_write(BIO * b,const char * in,int inl)118 null_write(BIO *b, const char *in, int inl)
119 {
120 return (inl);
121 }
122
123 static long
null_ctrl(BIO * b,int cmd,long num,void * ptr)124 null_ctrl(BIO *b, int cmd, long num, void *ptr)
125 {
126 long ret = 1;
127
128 switch (cmd) {
129 case BIO_CTRL_RESET:
130 case BIO_CTRL_EOF:
131 case BIO_CTRL_SET:
132 case BIO_CTRL_SET_CLOSE:
133 case BIO_CTRL_FLUSH:
134 case BIO_CTRL_DUP:
135 ret = 1;
136 break;
137 case BIO_CTRL_GET_CLOSE:
138 case BIO_CTRL_INFO:
139 case BIO_CTRL_GET:
140 case BIO_CTRL_PENDING:
141 case BIO_CTRL_WPENDING:
142 default:
143 ret = 0;
144 break;
145 }
146 return (ret);
147 }
148
149 static int
null_gets(BIO * bp,char * buf,int size)150 null_gets(BIO *bp, char *buf, int size)
151 {
152 return (0);
153 }
154
155 static int
null_puts(BIO * bp,const char * str)156 null_puts(BIO *bp, const char *str)
157 {
158 if (str == NULL)
159 return (0);
160 return (strlen(str));
161 }
162