bss_null.c revision 296465 
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
64static int null_write(BIO *h, const char *buf, int num);
65static int null_read(BIO *h, char *buf, int size);
66static int null_puts(BIO *h, const char *str);
67static int null_gets(BIO *h, char *str, int size);
68static long null_ctrl(BIO *h, int cmd, long arg1, void *arg2);
69static int null_new(BIO *h);
70static int null_free(BIO *data);
71static BIO_METHOD null_method = {
72    BIO_TYPE_NULL,
73    "NULL",
74    null_write,
75    null_read,
76    null_puts,
77    null_gets,
78    null_ctrl,
79    null_new,
80    null_free,
81    NULL,
82};
83
84BIO_METHOD *BIO_s_null(void)
85{
86    return (&null_method);
87}
88
89static int null_new(BIO *bi)
90{
91    bi->init = 1;
92    bi->num = 0;
93    bi->ptr = (NULL);
94    return (1);
95}
96
97static int null_free(BIO *a)
98{
99    if (a == NULL)
100        return (0);
101    return (1);
102}
103
104static int null_read(BIO *b, char *out, int outl)
105{
106    return (0);
107}
108
109static int null_write(BIO *b, const char *in, int inl)
110{
111    return (inl);
112}
113
114static long null_ctrl(BIO *b, int cmd, long num, void *ptr)
115{
116    long ret = 1;
117
118    switch (cmd) {
119    case BIO_CTRL_RESET:
120    case BIO_CTRL_EOF:
121    case BIO_CTRL_SET:
122    case BIO_CTRL_SET_CLOSE:
123    case BIO_CTRL_FLUSH:
124    case BIO_CTRL_DUP:
125        ret = 1;
126        break;
127    case BIO_CTRL_GET_CLOSE:
128    case BIO_CTRL_INFO:
129    case BIO_CTRL_GET:
130    case BIO_CTRL_PENDING:
131    case BIO_CTRL_WPENDING:
132    default:
133        ret = 0;
134        break;
135    }
136    return (ret);
137}
138
139static int null_gets(BIO *bp, char *buf, int size)
140{
141    return (0);
142}
143
144static int null_puts(BIO *bp, const char *str)
145{
146    if (str == NULL)
147        return (0);
148    return (strlen(str));
149}
150