1 /* crypto/bio/bss_null.c */
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 <stdio.h>
60 #include <errno.h>
61 #include "cryptlib.h"
62 #include <openssl/bio.h>
63
64 static int null_write(BIO *h, const char *buf, int num);
65 static int null_read(BIO *h, char *buf, int size);
66 static int null_puts(BIO *h, const char *str);
67 static int null_gets(BIO *h, char *str, int size);
68 static long null_ctrl(BIO *h, int cmd, long arg1, void *arg2);
69 static int null_new(BIO *h);
70 static int null_free(BIO *data);
71 static BIO_METHOD null_method=
72 {
73 BIO_TYPE_NULL,
74 "NULL",
75 null_write,
76 null_read,
77 null_puts,
78 null_gets,
79 null_ctrl,
80 null_new,
81 null_free,
82 NULL,
83 };
84
85 BIO_METHOD *BIO_s_null(void)
86 {
87 return(&null_method);
88 }
89
90 static int null_new(BIO *bi)
91 {
92 bi->init=1;
93 bi->num=0;
94 bi->ptr=(NULL);
95 return(1);
96 }
97
98 static int null_free(BIO *a)
99 {
100 if (a == NULL) return(0);
101 return(1);
102 }
103
104 static int null_read(BIO *b, char *out, int outl)
105 {
106 return(0);
107 }
108
109 static int null_write(BIO *b, const char *in, int inl)
110 {
111 return(inl);
112 }
113
114 static long null_ctrl(BIO *b, int cmd, long num, void *ptr)
115 {
116 long ret=1;
117
118 switch (cmd)
119 {
120 case BIO_CTRL_RESET:
121 case BIO_CTRL_EOF:
122 case BIO_CTRL_SET:
123 case BIO_CTRL_SET_CLOSE:
124 case BIO_CTRL_FLUSH:
125 case BIO_CTRL_DUP:
126 ret=1;
127 break;
128 case BIO_CTRL_GET_CLOSE:
129 case BIO_CTRL_INFO:
130 case BIO_CTRL_GET:
131 case BIO_CTRL_PENDING:
132 case BIO_CTRL_WPENDING:
133 default:
134 ret=0;
135 break;
136 }
137 return(ret);
138 }
139
140 static int null_gets(BIO *bp, char *buf, int size)
141 {
142 return(0);
143 }
144
145 static int null_puts(BIO *bp, const char *str)
146 {
147 if (str == NULL) return(0);
148 return(strlen(str));
149 }