1/*
2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stdio.h>
11#include <errno.h>
12#include "bio_local.h"
13#include "internal/cryptlib.h"
14#include <openssl/rand.h>
15
16/*
17 * BIO_put and BIO_get both add to the digest, BIO_gets returns the digest
18 */
19
20static int nbiof_write(BIO *h, const char *buf, int num);
21static int nbiof_read(BIO *h, char *buf, int size);
22static int nbiof_puts(BIO *h, const char *str);
23static int nbiof_gets(BIO *h, char *str, int size);
24static long nbiof_ctrl(BIO *h, int cmd, long arg1, void *arg2);
25static int nbiof_new(BIO *h);
26static int nbiof_free(BIO *data);
27static long nbiof_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);
28typedef struct nbio_test_st {
29 /* only set if we sent a 'should retry' error */
30 int lrn;
31 int lwn;
32} NBIO_TEST;
33
34static const BIO_METHOD methods_nbiof = {
35 BIO_TYPE_NBIO_TEST,
36 "non-blocking IO test filter",
37 /* TODO: Convert to new style write function */
38 bwrite_conv,
39 nbiof_write,
40 /* TODO: Convert to new style read function */
41 bread_conv,
42 nbiof_read,
43 nbiof_puts,
44 nbiof_gets,
45 nbiof_ctrl,
46 nbiof_new,
47 nbiof_free,
48 nbiof_callback_ctrl,
49};
50
51const BIO_METHOD *BIO_f_nbio_test(void)
52{
53 return &methods_nbiof;
54}
55
56static int nbiof_new(BIO *bi)
57{
58 NBIO_TEST *nt;
59
60 if ((nt = OPENSSL_zalloc(sizeof(*nt))) == NULL) {
61 BIOerr(BIO_F_NBIOF_NEW, ERR_R_MALLOC_FAILURE);
62 return 0;
63 }
64 nt->lrn = -1;
65 nt->lwn = -1;
66 bi->ptr = (char *)nt;
67 bi->init = 1;
68 return 1;
69}
70
71static int nbiof_free(BIO *a)
72{
73 if (a == NULL)
74 return 0;
75 OPENSSL_free(a->ptr);
76 a->ptr = NULL;
77 a->init = 0;
78 a->flags = 0;
79 return 1;
80}
81
82static int nbiof_read(BIO *b, char *out, int outl)
83{
84 int ret = 0;
85 int num;
86 unsigned char n;
87
88 if (out == NULL)
89 return 0;
90 if (b->next_bio == NULL)
91 return 0;
92
93 BIO_clear_retry_flags(b);
94 if (RAND_priv_bytes(&n, 1) <= 0)
95 return -1;
96 num = (n & 0x07);
97
98 if (outl > num)
99 outl = num;
100
101 if (num == 0) {
102 ret = -1;
103 BIO_set_retry_read(b);
104 } else {
105 ret = BIO_read(b->next_bio, out, outl);
106 if (ret < 0)
107 BIO_copy_next_retry(b);
108 }
109 return ret;
110}
111
112static int nbiof_write(BIO *b, const char *in, int inl)
113{
114 NBIO_TEST *nt;
115 int ret = 0;
116 int num;
117 unsigned char n;
118
119 if ((in == NULL) || (inl <= 0))
120 return 0;
121 if (b->next_bio == NULL)
122 return 0;
123 nt = (NBIO_TEST *)b->ptr;
124
125 BIO_clear_retry_flags(b);
126
127 if (nt->lwn > 0) {
128 num = nt->lwn;
129 nt->lwn = 0;
130 } else {
131 if (RAND_priv_bytes(&n, 1) <= 0)
132 return -1;
133 num = (n & 7);
134 }
135
136 if (inl > num)
137 inl = num;
138
139 if (num == 0) {
140 ret = -1;
141 BIO_set_retry_write(b);
142 } else {
143 ret = BIO_write(b->next_bio, in, inl);
144 if (ret < 0) {
145 BIO_copy_next_retry(b);
146 nt->lwn = inl;
147 }
148 }
149 return ret;
150}
151
152static long nbiof_ctrl(BIO *b, int cmd, long num, void *ptr)
153{
154 long ret;
155
156 if (b->next_bio == NULL)
157 return 0;
158 switch (cmd) {
159 case BIO_C_DO_STATE_MACHINE:
160 BIO_clear_retry_flags(b);
161 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
162 BIO_copy_next_retry(b);
163 break;
164 case BIO_CTRL_DUP:
165 ret = 0L;
166 break;
167 default:
168 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
169 break;
170 }
171 return ret;
172}
173
174static long nbiof_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
175{
176 long ret = 1;
177
178 if (b->next_bio == NULL)
179 return 0;
180 switch (cmd) {
181 default:
182 ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
183 break;
184 }
185 return ret;
186}
187
188static int nbiof_gets(BIO *bp, char *buf, int size)
189{
190 if (bp->next_bio == NULL)
191 return 0;
192 return BIO_gets(bp->next_bio, buf, size);
193}
194
195static int nbiof_puts(BIO *bp, const char *str)
196{
197 if (bp->next_bio == NULL)
198 return 0;
199 return BIO_puts(bp->next_bio, str);
200}
201