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
67 static int nullf_write(BIO *h, const char *buf, int num);
68 static int nullf_read(BIO *h, char *buf, int size);
69 static int nullf_puts(BIO *h, const char *str);
70 static int nullf_gets(BIO *h, char *str, int size);
71 static long nullf_ctrl(BIO *h, int cmd, long arg1, void *arg2);
72 static int nullf_new(BIO *h);
73 static int nullf_free(BIO *data);
74 static long nullf_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
75 static 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
89 BIO_METHOD *BIO_f_null(void)
90 {
91 return(&methods_nullf);
92 }
93
94 static int nullf_new(BIO *bi)
95 {
96 bi->init=1;
97 bi->ptr=NULL;
98 bi->flags=0;
99 return(1);
100 }
101
102 static 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
111 static 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
123 static 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
135 static 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
156 static 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
170 static 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
177 static 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 }