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bss_null.c
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1 /* crypto/bio/bss_null.c */
2 /* Copyright (C) 1995-1998 Eric Young ([email protected])
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young ([email protected]).
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 ([email protected]).
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 ([email protected])"
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 ([email protected])"
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 static int null_write(BIO *h, const char *buf, int num);
65 static int null_read(BIO *h, char *buf, int size);
66 static int null_puts(BIO *h, const char *str);
67 static int null_gets(BIO *h, char *str, int size);
68 static long null_ctrl(BIO *h, int cmd, long arg1, void *arg2);
69 static int null_new(BIO *h);
70 static int null_free(BIO *data);
71 static BIO_METHOD null_method=
72  {
73  BIO_TYPE_NULL,
74  "NULL",
75  null_write,
76  null_read,
77  null_puts,
78  null_gets,
79  null_ctrl,
80  null_new,
81  null_free,
82  NULL,
83  };
84 
85 BIO_METHOD *BIO_s_null(void)
86  {
87  return(&null_method);
88  }
89 
90 static int null_new(BIO *bi)
91  {
92  bi->init=1;
93  bi->num=0;
94  bi->ptr=(NULL);
95  return(1);
96  }
97 
98 static int null_free(BIO *a)
99  {
100  if (a == NULL) return(0);
101  return(1);
102  }
103 
104 static int null_read(BIO *b, char *out, int outl)
105  {
106  return(0);
107  }
108 
109 static int null_write(BIO *b, const char *in, int inl)
110  {
111  return(inl);
112  }
113 
114 static long null_ctrl(BIO *b, int cmd, long num, void *ptr)
115  {
116  long ret=1;
117 
118  switch (cmd)
119  {
120  case BIO_CTRL_RESET:
121  case BIO_CTRL_EOF:
122  case BIO_CTRL_SET:
123  case BIO_CTRL_SET_CLOSE:
124  case BIO_CTRL_FLUSH:
125  case BIO_CTRL_DUP:
126  ret=1;
127  break;
128  case BIO_CTRL_GET_CLOSE:
129  case BIO_CTRL_INFO:
130  case BIO_CTRL_GET:
131  case BIO_CTRL_PENDING:
132  case BIO_CTRL_WPENDING:
133  default:
134  ret=0;
135  break;
136  }
137  return(ret);
138  }
139 
140 static int null_gets(BIO *bp, char *buf, int size)
141  {
142  return(0);
143  }
144 
145 static int null_puts(BIO *bp, const char *str)
146  {
147  if (str == NULL) return(0);
148  return(strlen(str));
149  }
150 
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