bf_nbio.c revision 100936 
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,const char *buf,int num);
70static int nbiof_read(BIO *h,char *buf,int size);
71static int nbiof_puts(BIO *h,const char *str);
72static int nbiof_gets(BIO *h,char *str,int size);
73static long nbiof_ctrl(BIO *h,int cmd,long arg1,void *arg2);
74static int nbiof_new(BIO *h);
75static int nbiof_free(BIO *data);
76static long nbiof_callback_ctrl(BIO *h,int cmd,bio_info_cb *fp);
77typedef struct nbio_test_st
78	{
79	/* only set if we sent a 'should retry' error */
80	int lrn;
81	int lwn;
82	} NBIO_TEST;
83
84static BIO_METHOD methods_nbiof=
85	{
86	BIO_TYPE_NBIO_TEST,
87	"non-blocking IO test filter",
88	nbiof_write,
89	nbiof_read,
90	nbiof_puts,
91	nbiof_gets,
92	nbiof_ctrl,
93	nbiof_new,
94	nbiof_free,
95	nbiof_callback_ctrl,
96	};
97
98BIO_METHOD *BIO_f_nbio_test(void)
99	{
100	return(&methods_nbiof);
101	}
102
103static int nbiof_new(BIO *bi)
104	{
105	NBIO_TEST *nt;
106
107	if (!(nt=(NBIO_TEST *)OPENSSL_malloc(sizeof(NBIO_TEST)))) return(0);
108	nt->lrn= -1;
109	nt->lwn= -1;
110	bi->ptr=(char *)nt;
111	bi->init=1;
112	bi->flags=0;
113	return(1);
114	}
115
116static int nbiof_free(BIO *a)
117	{
118	if (a == NULL) return(0);
119	if (a->ptr != NULL)
120		OPENSSL_free(a->ptr);
121	a->ptr=NULL;
122	a->init=0;
123	a->flags=0;
124	return(1);
125	}
126
127static int nbiof_read(BIO *b, char *out, int outl)
128	{
129	NBIO_TEST *nt;
130	int ret=0;
131#if 0
132	int num;
133	unsigned char n;
134#endif
135
136	if (out == NULL) return(0);
137	if (b->next_bio == NULL) return(0);
138	nt=(NBIO_TEST *)b->ptr;
139
140	BIO_clear_retry_flags(b);
141#if 0
142	RAND_pseudo_bytes(&n,1);
143	num=(n&0x07);
144
145	if (outl > num) outl=num;
146
147	if (num == 0)
148		{
149		ret= -1;
150		BIO_set_retry_read(b);
151		}
152	else
153#endif
154		{
155		ret=BIO_read(b->next_bio,out,outl);
156		if (ret < 0)
157			BIO_copy_next_retry(b);
158		}
159	return(ret);
160	}
161
162static int nbiof_write(BIO *b, const char *in, int inl)
163	{
164	NBIO_TEST *nt;
165	int ret=0;
166	int num;
167	unsigned char n;
168
169	if ((in == NULL) || (inl <= 0)) return(0);
170	if (b->next_bio == NULL) return(0);
171	nt=(NBIO_TEST *)b->ptr;
172
173	BIO_clear_retry_flags(b);
174
175#if 1
176	if (nt->lwn > 0)
177		{
178		num=nt->lwn;
179		nt->lwn=0;
180		}
181	else
182		{
183		RAND_pseudo_bytes(&n,1);
184		num=(n&7);
185		}
186
187	if (inl > num) inl=num;
188
189	if (num == 0)
190		{
191		ret= -1;
192		BIO_set_retry_write(b);
193		}
194	else
195#endif
196		{
197		ret=BIO_write(b->next_bio,in,inl);
198		if (ret < 0)
199			{
200			BIO_copy_next_retry(b);
201			nt->lwn=inl;
202			}
203		}
204	return(ret);
205	}
206
207static long nbiof_ctrl(BIO *b, int cmd, long num, void *ptr)
208	{
209	long ret;
210
211	if (b->next_bio == NULL) return(0);
212	switch (cmd)
213		{
214        case BIO_C_DO_STATE_MACHINE:
215		BIO_clear_retry_flags(b);
216		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
217		BIO_copy_next_retry(b);
218		break;
219	case BIO_CTRL_DUP:
220		ret=0L;
221		break;
222	default:
223		ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
224		break;
225		}
226	return(ret);
227	}
228
229static long nbiof_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
230	{
231	long ret=1;
232
233	if (b->next_bio == NULL) return(0);
234	switch (cmd)
235		{
236	default:
237		ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
238		break;
239		}
240	return(ret);
241	}
242
243static int nbiof_gets(BIO *bp, char *buf, int size)
244	{
245	if (bp->next_bio == NULL) return(0);
246	return(BIO_gets(bp->next_bio,buf,size));
247	}
248
249
250static int nbiof_puts(BIO *bp, const char *str)
251	{
252	if (bp->next_bio == NULL) return(0);
253	return(BIO_puts(bp->next_bio,str));
254	}
255
256
257