bf_null.c revision 68651 
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#include <openssl/evp.h>
64
65/* BIO_put and BIO_get both add to the digest,
66 * BIO_gets returns the digest */
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	{
78	BIO_TYPE_NULL_FILTER,
79	"NULL filter",
80	nullf_write,
81	nullf_read,
82	nullf_puts,
83	nullf_gets,
84	nullf_ctrl,
85	nullf_new,
86	nullf_free,
87	nullf_callback_ctrl,
88	};
89
90BIO_METHOD *BIO_f_null(void)
91	{
92	return(&methods_nullf);
93	}
94
95static int nullf_new(BIO *bi)
96	{
97	bi->init=1;
98	bi->ptr=NULL;
99	bi->flags=0;
100	return(1);
101	}
102
103static int nullf_free(BIO *a)
104	{
105	if (a == NULL) return(0);
106/*	a->ptr=NULL;
107	a->init=0;
108	a->flags=0;*/
109	return(1);
110	}
111
112static int nullf_read(BIO *b, char *out, int outl)
113	{
114	int ret=0;
115
116	if (out == NULL) return(0);
117	if (b->next_bio == NULL) return(0);
118	ret=BIO_read(b->next_bio,out,outl);
119	BIO_clear_retry_flags(b);
120	BIO_copy_next_retry(b);
121	return(ret);
122	}
123
124static int nullf_write(BIO *b, const char *in, int inl)
125	{
126	int ret=0;
127
128	if ((in == NULL) || (inl <= 0)) return(0);
129	if (b->next_bio == NULL) return(0);
130	ret=BIO_write(b->next_bio,in,inl);
131	BIO_clear_retry_flags(b);
132	BIO_copy_next_retry(b);
133	return(ret);
134	}
135
136static long nullf_ctrl(BIO *b, int cmd, long num, void *ptr)
137	{
138	long ret;
139
140	if (b->next_bio == NULL) return(0);
141	switch(cmd)
142		{
143        case BIO_C_DO_STATE_MACHINE:
144		BIO_clear_retry_flags(b);
145		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
146		BIO_copy_next_retry(b);
147		break;
148	case BIO_CTRL_DUP:
149		ret=0L;
150		break;
151	default:
152		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
153		}
154	return(ret);
155	}
156
157static long nullf_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
158	{
159	long ret=1;
160
161	if (b->next_bio == NULL) return(0);
162	switch (cmd)
163		{
164	default:
165		ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
166		break;
167		}
168	return(ret);
169	}
170
171static int nullf_gets(BIO *bp, char *buf, int size)
172	{
173	if (bp->next_bio == NULL) return(0);
174	return(BIO_gets(bp->next_bio,buf,size));
175	}
176
177
178static int nullf_puts(BIO *bp, const char *str)
179	{
180	if (bp->next_bio == NULL) return(0);
181	return(BIO_puts(bp->next_bio,str));
182	}
183
184
185