1 /* $OpenBSD: bf_null.c,v 1.15 2023/07/05 21:23:37 beck Exp $ */
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 <errno.h>
60 #include <stdio.h>
61
62 #include <openssl/bio.h>
63
64 #include "bio_local.h"
65
66 /* BIO_put and BIO_get both add to the digest,
67 * BIO_gets returns the digest */
68
69 static int nullf_write(BIO *h, const char *buf, int num);
70 static int nullf_read(BIO *h, char *buf, int size);
71 static int nullf_puts(BIO *h, const char *str);
72 static int nullf_gets(BIO *h, char *str, int size);
73 static long nullf_ctrl(BIO *h, int cmd, long arg1, void *arg2);
74 static int nullf_new(BIO *h);
75 static int nullf_free(BIO *data);
76 static long nullf_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);
77
78 static const BIO_METHOD methods_nullf = {
79 .type = BIO_TYPE_NULL_FILTER,
80 .name = "NULL filter",
81 .bwrite = nullf_write,
82 .bread = nullf_read,
83 .bputs = nullf_puts,
84 .bgets = nullf_gets,
85 .ctrl = nullf_ctrl,
86 .create = nullf_new,
87 .destroy = nullf_free,
88 .callback_ctrl = nullf_callback_ctrl
89 };
90
91 const BIO_METHOD *
BIO_f_null(void)92 BIO_f_null(void)
93 {
94 return (&methods_nullf);
95 }
96 LCRYPTO_ALIAS(BIO_f_null);
97
98 static int
nullf_new(BIO * bi)99 nullf_new(BIO *bi)
100 {
101 bi->init = 1;
102 bi->ptr = NULL;
103 bi->flags = 0;
104 return (1);
105 }
106
107 static int
nullf_free(BIO * a)108 nullf_free(BIO *a)
109 {
110 if (a == NULL)
111 return (0);
112 /* a->ptr=NULL;
113 a->init=0;
114 a->flags=0;*/
115 return (1);
116 }
117
118 static int
nullf_read(BIO * b,char * out,int outl)119 nullf_read(BIO *b, char *out, int outl)
120 {
121 int ret = 0;
122
123 if (out == NULL)
124 return (0);
125 if (b->next_bio == NULL)
126 return (0);
127 ret = BIO_read(b->next_bio, out, outl);
128 BIO_clear_retry_flags(b);
129 BIO_copy_next_retry(b);
130 return (ret);
131 }
132
133 static int
nullf_write(BIO * b,const char * in,int inl)134 nullf_write(BIO *b, const char *in, int inl)
135 {
136 int ret = 0;
137
138 if ((in == NULL) || (inl <= 0))
139 return (0);
140 if (b->next_bio == NULL)
141 return (0);
142 ret = BIO_write(b->next_bio, in, inl);
143 BIO_clear_retry_flags(b);
144 BIO_copy_next_retry(b);
145 return (ret);
146 }
147
148 static long
nullf_ctrl(BIO * b,int cmd,long num,void * ptr)149 nullf_ctrl(BIO *b, int cmd, long num, void *ptr)
150 {
151 long ret;
152
153 if (b->next_bio == NULL)
154 return (0);
155 switch (cmd) {
156 case BIO_C_DO_STATE_MACHINE:
157 BIO_clear_retry_flags(b);
158 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
159 BIO_copy_next_retry(b);
160 break;
161 case BIO_CTRL_DUP:
162 ret = 0L;
163 break;
164 default:
165 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
166 }
167 return (ret);
168 }
169
170 static long
nullf_callback_ctrl(BIO * b,int cmd,BIO_info_cb * fp)171 nullf_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
172 {
173 long ret = 1;
174
175 if (b->next_bio == NULL)
176 return (0);
177 switch (cmd) {
178 default:
179 ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
180 break;
181 }
182 return (ret);
183 }
184
185 static int
nullf_gets(BIO * bp,char * buf,int size)186 nullf_gets(BIO *bp, char *buf, int size)
187 {
188 if (bp->next_bio == NULL)
189 return (0);
190 return (BIO_gets(bp->next_bio, buf, size));
191 }
192
193 static int
nullf_puts(BIO * bp,const char * str)194 nullf_puts(BIO *bp, const char *str)
195 {
196 if (bp->next_bio == NULL)
197 return (0);
198 return (BIO_puts(bp->next_bio, str));
199 }
200