bf_nbio.c revision 55714 
1/* crypto/bio/bf_nbio.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/rand.h>
63#include <openssl/bio.h>
64#include <openssl/evp.h>
65
66/* BIO_put and BIO_get both add to the digest,
67 * BIO_gets returns the digest */
68
69static int nbiof_write(BIO *h,char *buf,int num);
70static int nbiof_read(BIO *h,char *buf,int size);
71static int nbiof_puts(BIO *h,char *str);
72static int nbiof_gets(BIO *h,char *str,int size);
73static long nbiof_ctrl(BIO *h,int cmd,long arg1,char *arg2);
74static int nbiof_new(BIO *h);
75static int nbiof_free(BIO *data);
76typedef struct nbio_test_st
77	{
78	/* only set if we sent a 'should retry' error */
79	int lrn;
80	int lwn;
81	} NBIO_TEST;
82
83static BIO_METHOD methods_nbiof=
84	{
85	BIO_TYPE_NBIO_TEST,
86	"non-blocking IO test filter",
87	nbiof_write,
88	nbiof_read,
89	nbiof_puts,
90	nbiof_gets,
91	nbiof_ctrl,
92	nbiof_new,
93	nbiof_free,
94	};
95
96BIO_METHOD *BIO_f_nbio_test(void)
97	{
98	return(&methods_nbiof);
99	}
100
101static int nbiof_new(BIO *bi)
102	{
103	NBIO_TEST *nt;
104
105	nt=(NBIO_TEST *)Malloc(sizeof(NBIO_TEST));
106	nt->lrn= -1;
107	nt->lwn= -1;
108	bi->ptr=(char *)nt;
109	bi->init=1;
110	bi->flags=0;
111	return(1);
112	}
113
114static int nbiof_free(BIO *a)
115	{
116	if (a == NULL) return(0);
117	if (a->ptr != NULL)
118		Free(a->ptr);
119	a->ptr=NULL;
120	a->init=0;
121	a->flags=0;
122	return(1);
123	}
124
125static int nbiof_read(BIO *b, char *out, int outl)
126	{
127	NBIO_TEST *nt;
128	int ret=0;
129#if 0
130	int num;
131	unsigned char n;
132#endif
133
134	if (out == NULL) return(0);
135	if (b->next_bio == NULL) return(0);
136	nt=(NBIO_TEST *)b->ptr;
137
138	BIO_clear_retry_flags(b);
139#if 0
140	RAND_bytes(&n,1);
141	num=(n&0x07);
142
143	if (outl > num) outl=num;
144
145	if (num == 0)
146		{
147		ret= -1;
148		BIO_set_retry_read(b);
149		}
150	else
151#endif
152		{
153		ret=BIO_read(b->next_bio,out,outl);
154		if (ret < 0)
155			BIO_copy_next_retry(b);
156		}
157	return(ret);
158	}
159
160static int nbiof_write(BIO *b, char *in, int inl)
161	{
162	NBIO_TEST *nt;
163	int ret=0;
164	int num;
165	unsigned char n;
166
167	if ((in == NULL) || (inl <= 0)) return(0);
168	if (b->next_bio == NULL) return(0);
169	nt=(NBIO_TEST *)b->ptr;
170
171	BIO_clear_retry_flags(b);
172
173#if 1
174	if (nt->lwn > 0)
175		{
176		num=nt->lwn;
177		nt->lwn=0;
178		}
179	else
180		{
181		RAND_bytes(&n,1);
182		num=(n&7);
183		}
184
185	if (inl > num) inl=num;
186
187	if (num == 0)
188		{
189		ret= -1;
190		BIO_set_retry_write(b);
191		}
192	else
193#endif
194		{
195		ret=BIO_write(b->next_bio,in,inl);
196		if (ret < 0)
197			{
198			BIO_copy_next_retry(b);
199			nt->lwn=inl;
200			}
201		}
202	return(ret);
203	}
204
205static long nbiof_ctrl(BIO *b, int cmd, long num, char *ptr)
206	{
207	long ret;
208
209	if (b->next_bio == NULL) return(0);
210	switch (cmd)
211		{
212        case BIO_C_DO_STATE_MACHINE:
213		BIO_clear_retry_flags(b);
214		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
215		BIO_copy_next_retry(b);
216		break;
217	case BIO_CTRL_DUP:
218		ret=0L;
219		break;
220	default:
221		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
222		break;
223		}
224	return(ret);
225	}
226
227static int nbiof_gets(BIO *bp, char *buf, int size)
228	{
229	if (bp->next_bio == NULL) return(0);
230	return(BIO_gets(bp->next_bio,buf,size));
231	}
232
233
234static int nbiof_puts(BIO *bp, char *str)
235	{
236	if (bp->next_bio == NULL) return(0);
237	return(BIO_puts(bp->next_bio,str));
238	}
239
240
241