1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
/*
* Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <errno.h>
#include "bio_lcl.h"
#include "internal/cryptlib.h"
#include <openssl/rand.h>
/*
* BIO_put and BIO_get both add to the digest, BIO_gets returns the digest
*/
static int nbiof_write(BIO *h, const char *buf, int num);
static int nbiof_read(BIO *h, char *buf, int size);
static int nbiof_puts(BIO *h, const char *str);
static int nbiof_gets(BIO *h, char *str, int size);
static long nbiof_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int nbiof_new(BIO *h);
static int nbiof_free(BIO *data);
static long nbiof_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);
typedef struct nbio_test_st {
/* only set if we sent a 'should retry' error */
int lrn;
int lwn;
} NBIO_TEST;
static const BIO_METHOD methods_nbiof = {
BIO_TYPE_NBIO_TEST,
"non-blocking IO test filter",
/* TODO: Convert to new style write function */
bwrite_conv,
nbiof_write,
/* TODO: Convert to new style read function */
bread_conv,
nbiof_read,
nbiof_puts,
nbiof_gets,
nbiof_ctrl,
nbiof_new,
nbiof_free,
nbiof_callback_ctrl,
};
const BIO_METHOD *BIO_f_nbio_test(void)
{
return &methods_nbiof;
}
static int nbiof_new(BIO *bi)
{
NBIO_TEST *nt;
if ((nt = OPENSSL_zalloc(sizeof(*nt))) == NULL) {
BIOerr(BIO_F_NBIOF_NEW, ERR_R_MALLOC_FAILURE);
return 0;
}
nt->lrn = -1;
nt->lwn = -1;
bi->ptr = (char *)nt;
bi->init = 1;
return 1;
}
static int nbiof_free(BIO *a)
{
if (a == NULL)
return 0;
OPENSSL_free(a->ptr);
a->ptr = NULL;
a->init = 0;
a->flags = 0;
return 1;
}
static int nbiof_read(BIO *b, char *out, int outl)
{
int ret = 0;
int num;
unsigned char n;
if (out == NULL)
return 0;
if (b->next_bio == NULL)
return 0;
BIO_clear_retry_flags(b);
if (RAND_priv_bytes(&n, 1) <= 0)
return -1;
num = (n & 0x07);
if (outl > num)
outl = num;
if (num == 0) {
ret = -1;
BIO_set_retry_read(b);
} else {
ret = BIO_read(b->next_bio, out, outl);
if (ret < 0)
BIO_copy_next_retry(b);
}
return ret;
}
static int nbiof_write(BIO *b, const char *in, int inl)
{
NBIO_TEST *nt;
int ret = 0;
int num;
unsigned char n;
if ((in == NULL) || (inl <= 0))
return 0;
if (b->next_bio == NULL)
return 0;
nt = (NBIO_TEST *)b->ptr;
BIO_clear_retry_flags(b);
if (nt->lwn > 0) {
num = nt->lwn;
nt->lwn = 0;
} else {
if (RAND_priv_bytes(&n, 1) <= 0)
return -1;
num = (n & 7);
}
if (inl > num)
inl = num;
if (num == 0) {
ret = -1;
BIO_set_retry_write(b);
} else {
ret = BIO_write(b->next_bio, in, inl);
if (ret < 0) {
BIO_copy_next_retry(b);
nt->lwn = inl;
}
}
return ret;
}
static long nbiof_ctrl(BIO *b, int cmd, long num, void *ptr)
{
long ret;
if (b->next_bio == NULL)
return 0;
switch (cmd) {
case BIO_C_DO_STATE_MACHINE:
BIO_clear_retry_flags(b);
ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
BIO_copy_next_retry(b);
break;
case BIO_CTRL_DUP:
ret = 0L;
break;
default:
ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
break;
}
return ret;
}
static long nbiof_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
{
long ret = 1;
if (b->next_bio == NULL)
return 0;
switch (cmd) {
default:
ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
break;
}
return ret;
}
static int nbiof_gets(BIO *bp, char *buf, int size)
{
if (bp->next_bio == NULL)
return 0;
return BIO_gets(bp->next_bio, buf, size);
}
static int nbiof_puts(BIO *bp, const char *str)
{
if (bp->next_bio == NULL)
return 0;
return BIO_puts(bp->next_bio, str);
}
|