bf_nbio.c revision 296465 
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/*
66 * BIO_put and BIO_get both add to the digest, BIO_gets returns the digest
67 */
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    /* 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    BIO_TYPE_NBIO_TEST,
85    "non-blocking IO test filter",
86    nbiof_write,
87    nbiof_read,
88    nbiof_puts,
89    nbiof_gets,
90    nbiof_ctrl,
91    nbiof_new,
92    nbiof_free,
93    nbiof_callback_ctrl,
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    if (!(nt = (NBIO_TEST *)OPENSSL_malloc(sizeof(NBIO_TEST))))
106        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)
118        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    int ret = 0;
130#if 1
131    int num;
132    unsigned char n;
133#endif
134
135    if (out == NULL)
136        return (0);
137    if (b->next_bio == NULL)
138        return (0);
139
140    BIO_clear_retry_flags(b);
141#if 1
142    RAND_pseudo_bytes(&n, 1);
143    num = (n & 0x07);
144
145    if (outl > num)
146        outl = num;
147
148    if (num == 0) {
149        ret = -1;
150        BIO_set_retry_read(b);
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))
169        return (0);
170    if (b->next_bio == NULL)
171        return (0);
172    nt = (NBIO_TEST *)b->ptr;
173
174    BIO_clear_retry_flags(b);
175
176#if 1
177    if (nt->lwn > 0) {
178        num = nt->lwn;
179        nt->lwn = 0;
180    } else {
181        RAND_pseudo_bytes(&n, 1);
182        num = (n & 7);
183    }
184
185    if (inl > num)
186        inl = num;
187
188    if (num == 0) {
189        ret = -1;
190        BIO_set_retry_write(b);
191    } else
192#endif
193    {
194        ret = BIO_write(b->next_bio, in, inl);
195        if (ret < 0) {
196            BIO_copy_next_retry(b);
197            nt->lwn = inl;
198        }
199    }
200    return (ret);
201}
202
203static long nbiof_ctrl(BIO *b, int cmd, long num, void *ptr)
204{
205    long ret;
206
207    if (b->next_bio == NULL)
208        return (0);
209    switch (cmd) {
210    case BIO_C_DO_STATE_MACHINE:
211        BIO_clear_retry_flags(b);
212        ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
213        BIO_copy_next_retry(b);
214        break;
215    case BIO_CTRL_DUP:
216        ret = 0L;
217        break;
218    default:
219        ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
220        break;
221    }
222    return (ret);
223}
224
225static long nbiof_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
226{
227    long ret = 1;
228
229    if (b->next_bio == NULL)
230        return (0);
231    switch (cmd) {
232    default:
233        ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
234        break;
235    }
236    return (ret);
237}
238
239static int nbiof_gets(BIO *bp, char *buf, int size)
240{
241    if (bp->next_bio == NULL)
242        return (0);
243    return (BIO_gets(bp->next_bio, buf, size));
244}
245
246static int nbiof_puts(BIO *bp, const char *str)
247{
248    if (bp->next_bio == NULL)
249        return (0);
250    return (BIO_puts(bp->next_bio, str));
251}
252