1 /* $OpenBSD: bf_nbio.c,v 1.22 2022/01/14 08:40:57 tb Exp $ */
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 <errno.h>
60 #include <stdio.h>
61 #include <stdlib.h>
62
63 #include <openssl/bio.h>
64
65 #include "bio_local.h"
66
67 /* BIO_put and BIO_get both add to the digest,
68 * BIO_gets returns the digest */
69
70 static int nbiof_write(BIO *h, const char *buf, int num);
71 static int nbiof_read(BIO *h, char *buf, int size);
72 static int nbiof_puts(BIO *h, const char *str);
73 static int nbiof_gets(BIO *h, char *str, int size);
74 static long nbiof_ctrl(BIO *h, int cmd, long arg1, void *arg2);
75 static int nbiof_new(BIO *h);
76 static int nbiof_free(BIO *data);
77 static long nbiof_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);
78
79 typedef struct nbio_test_st {
80 /* only set if we sent a 'should retry' error */
81 int lrn;
82 int lwn;
83 } NBIO_TEST;
84
85 static const BIO_METHOD methods_nbiof = {
86 .type = BIO_TYPE_NBIO_TEST,
87 .name = "non-blocking IO test filter",
88 .bwrite = nbiof_write,
89 .bread = nbiof_read,
90 .bputs = nbiof_puts,
91 .bgets = nbiof_gets,
92 .ctrl = nbiof_ctrl,
93 .create = nbiof_new,
94 .destroy = nbiof_free,
95 .callback_ctrl = nbiof_callback_ctrl
96 };
97
98 const BIO_METHOD *
BIO_f_nbio_test(void)99 BIO_f_nbio_test(void)
100 {
101 return (&methods_nbiof);
102 }
103
104 static int
nbiof_new(BIO * bi)105 nbiof_new(BIO *bi)
106 {
107 NBIO_TEST *nt;
108
109 if (!(nt = malloc(sizeof(NBIO_TEST))))
110 return (0);
111 nt->lrn = -1;
112 nt->lwn = -1;
113 bi->ptr = (char *)nt;
114 bi->init = 1;
115 bi->flags = 0;
116 return (1);
117 }
118
119 static int
nbiof_free(BIO * a)120 nbiof_free(BIO *a)
121 {
122 if (a == NULL)
123 return (0);
124 free(a->ptr);
125 a->ptr = NULL;
126 a->init = 0;
127 a->flags = 0;
128 return (1);
129 }
130
131 static int
nbiof_read(BIO * b,char * out,int outl)132 nbiof_read(BIO *b, char *out, int outl)
133 {
134 int ret = 0;
135 int num;
136 unsigned char n;
137
138 if (out == NULL)
139 return (0);
140 if (b->next_bio == NULL)
141 return (0);
142
143 BIO_clear_retry_flags(b);
144
145 arc4random_buf(&n, 1);
146 num = (n & 0x07);
147
148 if (outl > num)
149 outl = num;
150
151 if (num == 0) {
152 ret = -1;
153 BIO_set_retry_read(b);
154 } else {
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
162 static int
nbiof_write(BIO * b,const char * in,int inl)163 nbiof_write(BIO *b, const char *in, int inl)
164 {
165 NBIO_TEST *nt;
166 int ret = 0;
167 int num;
168 unsigned char n;
169
170 if ((in == NULL) || (inl <= 0))
171 return (0);
172 if (b->next_bio == NULL)
173 return (0);
174 nt = (NBIO_TEST *)b->ptr;
175
176 BIO_clear_retry_flags(b);
177
178 if (nt->lwn > 0) {
179 num = nt->lwn;
180 nt->lwn = 0;
181 } else {
182 arc4random_buf(&n, 1);
183 num = (n&7);
184 }
185
186 if (inl > num)
187 inl = num;
188
189 if (num == 0) {
190 ret = -1;
191 BIO_set_retry_write(b);
192 } else {
193 ret = BIO_write(b->next_bio, in, inl);
194 if (ret < 0) {
195 BIO_copy_next_retry(b);
196 nt->lwn = inl;
197 }
198 }
199 return (ret);
200 }
201
202 static long
nbiof_ctrl(BIO * b,int cmd,long num,void * ptr)203 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
225 static long
nbiof_callback_ctrl(BIO * b,int cmd,BIO_info_cb * fp)226 nbiof_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
227 {
228 long ret = 1;
229
230 if (b->next_bio == NULL)
231 return (0);
232 switch (cmd) {
233 default:
234 ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
235 break;
236 }
237 return (ret);
238 }
239
240 static int
nbiof_gets(BIO * bp,char * buf,int size)241 nbiof_gets(BIO *bp, char *buf, int size)
242 {
243 if (bp->next_bio == NULL)
244 return (0);
245 return (BIO_gets(bp->next_bio, buf, size));
246 }
247
248 static int
nbiof_puts(BIO * bp,const char * str)249 nbiof_puts(BIO *bp, const char *str)
250 {
251 if (bp->next_bio == NULL)
252 return (0);
253 return (BIO_puts(bp->next_bio, str));
254 }
255