source: trunk/sys/libcrypto/bf_nbio.c @ 1

Last change on this file since 1 was 1, checked in by alain, 5 years ago

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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 <openssl/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
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