bf_null.c revision 296465 
1/* crypto/bio/bf_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/*
65 * BIO_put and BIO_get both add to the digest, BIO_gets returns the digest
66 */
67
68static int nullf_write(BIO *h, const char *buf, int num);
69static int nullf_read(BIO *h, char *buf, int size);
70static int nullf_puts(BIO *h, const char *str);
71static int nullf_gets(BIO *h, char *str, int size);
72static long nullf_ctrl(BIO *h, int cmd, long arg1, void *arg2);
73static int nullf_new(BIO *h);
74static int nullf_free(BIO *data);
75static long nullf_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
76static BIO_METHOD methods_nullf = {
77    BIO_TYPE_NULL_FILTER,
78    "NULL filter",
79    nullf_write,
80    nullf_read,
81    nullf_puts,
82    nullf_gets,
83    nullf_ctrl,
84    nullf_new,
85    nullf_free,
86    nullf_callback_ctrl,
87};
88
89BIO_METHOD *BIO_f_null(void)
90{
91    return (&methods_nullf);
92}
93
94static int nullf_new(BIO *bi)
95{
96    bi->init = 1;
97    bi->ptr = NULL;
98    bi->flags = 0;
99    return (1);
100}
101
102static int nullf_free(BIO *a)
103{
104    if (a == NULL)
105        return (0);
106    /*-
107    a->ptr=NULL;
108    a->init=0;
109    a->flags=0;
110    */
111    return (1);
112}
113
114static int nullf_read(BIO *b, char *out, int outl)
115{
116    int ret = 0;
117
118    if (out == NULL)
119        return (0);
120    if (b->next_bio == NULL)
121        return (0);
122    ret = BIO_read(b->next_bio, out, outl);
123    BIO_clear_retry_flags(b);
124    BIO_copy_next_retry(b);
125    return (ret);
126}
127
128static int nullf_write(BIO *b, const char *in, int inl)
129{
130    int ret = 0;
131
132    if ((in == NULL) || (inl <= 0))
133        return (0);
134    if (b->next_bio == NULL)
135        return (0);
136    ret = BIO_write(b->next_bio, in, inl);
137    BIO_clear_retry_flags(b);
138    BIO_copy_next_retry(b);
139    return (ret);
140}
141
142static long nullf_ctrl(BIO *b, int cmd, long num, void *ptr)
143{
144    long ret;
145
146    if (b->next_bio == NULL)
147        return (0);
148    switch (cmd) {
149    case BIO_C_DO_STATE_MACHINE:
150        BIO_clear_retry_flags(b);
151        ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
152        BIO_copy_next_retry(b);
153        break;
154    case BIO_CTRL_DUP:
155        ret = 0L;
156        break;
157    default:
158        ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
159    }
160    return (ret);
161}
162
163static long nullf_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
164{
165    long ret = 1;
166
167    if (b->next_bio == NULL)
168        return (0);
169    switch (cmd) {
170    default:
171        ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
172        break;
173    }
174    return (ret);
175}
176
177static int nullf_gets(BIO *bp, char *buf, int size)
178{
179    if (bp->next_bio == NULL)
180        return (0);
181    return (BIO_gets(bp->next_bio, buf, size));
182}
183
184static int nullf_puts(BIO *bp, const char *str)
185{
186    if (bp->next_bio == NULL)
187        return (0);
188    return (BIO_puts(bp->next_bio, str));
189}
190