bf_null.c revision 656d9c7f52f88b3a3daccafa7655dec086c4756e 
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/* BIO_put and BIO_get both add to the digest,
65 * BIO_gets returns the digest */
66
67static int nullf_write(BIO *h, const char *buf, int num);
68static int nullf_read(BIO *h, char *buf, int size);
69static int nullf_puts(BIO *h, const char *str);
70static int nullf_gets(BIO *h, char *str, int size);
71static long nullf_ctrl(BIO *h, int cmd, long arg1, void *arg2);
72static int nullf_new(BIO *h);
73static int nullf_free(BIO *data);
74static long nullf_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
75static BIO_METHOD methods_nullf=
76	{
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) return(0);
105/*	a->ptr=NULL;
106	a->init=0;
107	a->flags=0;*/
108	return(1);
109	}
110
111static int nullf_read(BIO *b, char *out, int outl)
112	{
113	int ret=0;
114
115	if (out == NULL) return(0);
116	if (b->next_bio == NULL) return(0);
117	ret=BIO_read(b->next_bio,out,outl);
118	BIO_clear_retry_flags(b);
119	BIO_copy_next_retry(b);
120	return(ret);
121	}
122
123static int nullf_write(BIO *b, const char *in, int inl)
124	{
125	int ret=0;
126
127	if ((in == NULL) || (inl <= 0)) return(0);
128	if (b->next_bio == NULL) return(0);
129	ret=BIO_write(b->next_bio,in,inl);
130	BIO_clear_retry_flags(b);
131	BIO_copy_next_retry(b);
132	return(ret);
133	}
134
135static long nullf_ctrl(BIO *b, int cmd, long num, void *ptr)
136	{
137	long ret;
138
139	if (b->next_bio == NULL) return(0);
140	switch(cmd)
141		{
142        case BIO_C_DO_STATE_MACHINE:
143		BIO_clear_retry_flags(b);
144		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
145		BIO_copy_next_retry(b);
146		break;
147	case BIO_CTRL_DUP:
148		ret=0L;
149		break;
150	default:
151		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
152		}
153	return(ret);
154	}
155
156static long nullf_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
157	{
158	long ret=1;
159
160	if (b->next_bio == NULL) return(0);
161	switch (cmd)
162		{
163	default:
164		ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
165		break;
166		}
167	return(ret);
168	}
169
170static int nullf_gets(BIO *bp, char *buf, int size)
171	{
172	if (bp->next_bio == NULL) return(0);
173	return(BIO_gets(bp->next_bio,buf,size));
174	}
175
176
177static int nullf_puts(BIO *bp, const char *str)
178	{
179	if (bp->next_bio == NULL) return(0);
180	return(BIO_puts(bp->next_bio,str));
181	}
182
183
184