bf_nbio.c revision bdfb8ad83da0647e9b9a32792598e8ce7ba3ef4d 
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
65/* BIO_put and BIO_get both add to the digest,
66 * BIO_gets returns the digest */
67
68static int nbiof_write(BIO *h,const char *buf,int num);
69static int nbiof_read(BIO *h,char *buf,int size);
70static int nbiof_puts(BIO *h,const char *str);
71static int nbiof_gets(BIO *h,char *str,int size);
72static long nbiof_ctrl(BIO *h,int cmd,long arg1,void *arg2);
73static int nbiof_new(BIO *h);
74static int nbiof_free(BIO *data);
75static long nbiof_callback_ctrl(BIO *h,int cmd,bio_info_cb *fp);
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	nbiof_callback_ctrl,
95	};
96
97BIO_METHOD *BIO_f_nbio_test(void)
98	{
99	return(&methods_nbiof);
100	}
101
102static int nbiof_new(BIO *bi)
103	{
104	NBIO_TEST *nt;
105
106	if (!(nt=(NBIO_TEST *)OPENSSL_malloc(sizeof(NBIO_TEST)))) return(0);
107	nt->lrn= -1;
108	nt->lwn= -1;
109	bi->ptr=(char *)nt;
110	bi->init=1;
111	bi->flags=0;
112	return(1);
113	}
114
115static int nbiof_free(BIO *a)
116	{
117	if (a == NULL) return(0);
118	if (a->ptr != NULL)
119		OPENSSL_free(a->ptr);
120	a->ptr=NULL;
121	a->init=0;
122	a->flags=0;
123	return(1);
124	}
125
126static int nbiof_read(BIO *b, char *out, int outl)
127	{
128	NBIO_TEST *nt;
129	int ret=0;
130#if 1
131	int num;
132	unsigned char n;
133#endif
134
135	if (out == NULL) return(0);
136	if (b->next_bio == NULL) return(0);
137	nt=(NBIO_TEST *)b->ptr;
138
139	BIO_clear_retry_flags(b);
140#if 1
141	RAND_pseudo_bytes(&n,1);
142	num=(n&0x07);
143
144	if (outl > num) outl=num;
145
146	if (num == 0)
147		{
148		ret= -1;
149		BIO_set_retry_read(b);
150		}
151	else
152#endif
153		{
154		ret=BIO_read(b->next_bio,out,outl);
155		if (ret < 0)
156			BIO_copy_next_retry(b);
157		}
158	return(ret);
159	}
160
161static int nbiof_write(BIO *b, const char *in, int inl)
162	{
163	NBIO_TEST *nt;
164	int ret=0;
165	int num;
166	unsigned char n;
167
168	if ((in == NULL) || (inl <= 0)) return(0);
169	if (b->next_bio == NULL) return(0);
170	nt=(NBIO_TEST *)b->ptr;
171
172	BIO_clear_retry_flags(b);
173
174#if 1
175	if (nt->lwn > 0)
176		{
177		num=nt->lwn;
178		nt->lwn=0;
179		}
180	else
181		{
182		RAND_pseudo_bytes(&n,1);
183		num=(n&7);
184		}
185
186	if (inl > num) inl=num;
187
188	if (num == 0)
189		{
190		ret= -1;
191		BIO_set_retry_write(b);
192		}
193	else
194#endif
195		{
196		ret=BIO_write(b->next_bio,in,inl);
197		if (ret < 0)
198			{
199			BIO_copy_next_retry(b);
200			nt->lwn=inl;
201			}
202		}
203	return(ret);
204	}
205
206static long nbiof_ctrl(BIO *b, int cmd, long num, void *ptr)
207	{
208	long ret;
209
210	if (b->next_bio == NULL) return(0);
211	switch (cmd)
212		{
213        case BIO_C_DO_STATE_MACHINE:
214		BIO_clear_retry_flags(b);
215		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
216		BIO_copy_next_retry(b);
217		break;
218	case BIO_CTRL_DUP:
219		ret=0L;
220		break;
221	default:
222		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
223		break;
224		}
225	return(ret);
226	}
227
228static long nbiof_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
229	{
230	long ret=1;
231
232	if (b->next_bio == NULL) return(0);
233	switch (cmd)
234		{
235	default:
236		ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
237		break;
238		}
239	return(ret);
240	}
241
242static int nbiof_gets(BIO *bp, char *buf, int size)
243	{
244	if (bp->next_bio == NULL) return(0);
245	return(BIO_gets(bp->next_bio,buf,size));
246	}
247
248
249static int nbiof_puts(BIO *bp, const char *str)
250	{
251	if (bp->next_bio == NULL) return(0);
252	return(BIO_puts(bp->next_bio,str));
253	}
254
255
256