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bf_nbio.c

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1/* $OpenBSD: bf_nbio.c,v 1.20 2018/05/01 13:29:09 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/* 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);-
76-
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 const BIO_METHOD methods_nbiof = {-
84 .type = BIO_TYPE_NBIO_TEST,-
85 .name = "non-blocking IO test filter",-
86 .bwrite = nbiof_write,-
87 .bread = nbiof_read,-
88 .bputs = nbiof_puts,-
89 .bgets = nbiof_gets,-
90 .ctrl = nbiof_ctrl,-
91 .create = nbiof_new,-
92 .destroy = nbiof_free,-
93 .callback_ctrl = nbiof_callback_ctrl-
94};-
95-
96const BIO_METHOD *-
97BIO_f_nbio_test(void)-
98{-
99 return (&methods_nbiof);
never executed: return (&methods_nbiof);
0
100}-
101-
102static int-
103nbiof_new(BIO *bi)-
104{-
105 NBIO_TEST *nt;-
106-
107 if (!(nt = malloc(sizeof(NBIO_TEST))))
!(nt = malloc(...f(NBIO_TEST)))Description
TRUEnever evaluated
FALSEnever evaluated
0
108 return (0);
never executed: return (0);
0
109 nt->lrn = -1;-
110 nt->lwn = -1;-
111 bi->ptr = (char *)nt;-
112 bi->init = 1;-
113 bi->flags = 0;-
114 return (1);
never executed: return (1);
0
115}-
116-
117static int-
118nbiof_free(BIO *a)-
119{-
120 if (a == NULL)
a == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
121 return (0);
never executed: return (0);
0
122 free(a->ptr);-
123 a->ptr = NULL;-
124 a->init = 0;-
125 a->flags = 0;-
126 return (1);
never executed: return (1);
0
127}-
128-
129static int-
130nbiof_read(BIO *b, char *out, int outl)-
131{-
132 int ret = 0;-
133 int num;-
134 unsigned char n;-
135-
136 if (out == NULL)
out == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
137 return (0);
never executed: return (0);
0
138 if (b->next_bio == NULL)
b->next_bio == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
139 return (0);
never executed: return (0);
0
140-
141 BIO_clear_retry_flags(b);-
142-
143 arc4random_buf(&n, 1);-
144 num = (n & 0x07);-
145-
146 if (outl > num)
outl > numDescription
TRUEnever evaluated
FALSEnever evaluated
0
147 outl = num;
never executed: outl = num;
0
148-
149 if (num == 0) {
num == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
150 ret = -1;-
151 BIO_set_retry_read(b);-
152 } else {
never executed: end of block
0
153 ret = BIO_read(b->next_bio, out, outl);-
154 if (ret < 0)
ret < 0Description
TRUEnever evaluated
FALSEnever evaluated
0
155 BIO_copy_next_retry(b);
never executed: BIO_copy_next_retry(b);
0
156 }
never executed: end of block
0
157 return (ret);
never executed: return (ret);
0
158}-
159-
160static int-
161nbiof_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))
(in == ((void *)0) )Description
TRUEnever evaluated
FALSEnever evaluated
(inl <= 0)Description
TRUEnever evaluated
FALSEnever evaluated
0
169 return (0);
never executed: return (0);
0
170 if (b->next_bio == NULL)
b->next_bio == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
171 return (0);
never executed: return (0);
0
172 nt = (NBIO_TEST *)b->ptr;-
173-
174 BIO_clear_retry_flags(b);-
175-
176 if (nt->lwn > 0) {
nt->lwn > 0Description
TRUEnever evaluated
FALSEnever evaluated
0
177 num = nt->lwn;-
178 nt->lwn = 0;-
179 } else {
never executed: end of block
0
180 arc4random_buf(&n, 1);-
181 num = (n&7);-
182 }
never executed: end of block
0
183-
184 if (inl > num)
inl > numDescription
TRUEnever evaluated
FALSEnever evaluated
0
185 inl = num;
never executed: inl = num;
0
186-
187 if (num == 0) {
num == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
188 ret = -1;-
189 BIO_set_retry_write(b);-
190 } else {
never executed: end of block
0
191 ret = BIO_write(b->next_bio, in, inl);-
192 if (ret < 0) {
ret < 0Description
TRUEnever evaluated
FALSEnever evaluated
0
193 BIO_copy_next_retry(b);-
194 nt->lwn = inl;-
195 }
never executed: end of block
0
196 }
never executed: end of block
0
197 return (ret);
never executed: return (ret);
0
198}-
199-
200static long-
201nbiof_ctrl(BIO *b, int cmd, long num, void *ptr)-
202{-
203 long ret;-
204-
205 if (b->next_bio == NULL)
b->next_bio == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
206 return (0);
never executed: return (0);
0
207 switch (cmd) {-
208 case BIO_C_DO_STATE_MACHINE:
never executed: case 101:
0
209 BIO_clear_retry_flags(b);-
210 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);-
211 BIO_copy_next_retry(b);-
212 break;
never executed: break;
0
213 case BIO_CTRL_DUP:
never executed: case 12:
0
214 ret = 0L;-
215 break;
never executed: break;
0
216 default:
never executed: default:
0
217 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);-
218 break;
never executed: break;
0
219 }-
220 return (ret);
never executed: return (ret);
0
221}-
222-
223static long-
224nbiof_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)-
225{-
226 long ret = 1;-
227-
228 if (b->next_bio == NULL)
b->next_bio == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
229 return (0);
never executed: return (0);
0
230 switch (cmd) {-
231 default:
never executed: default:
0
232 ret = BIO_callback_ctrl(b->next_bio, cmd, fp);-
233 break;
never executed: break;
0
234 }-
235 return (ret);
never executed: return (ret);
0
236}-
237-
238static int-
239nbiof_gets(BIO *bp, char *buf, int size)-
240{-
241 if (bp->next_bio == NULL)
bp->next_bio == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
242 return (0);
never executed: return (0);
0
243 return (BIO_gets(bp->next_bio, buf, size));
never executed: return (BIO_gets(bp->next_bio, buf, size));
0
244}-
245-
246static int-
247nbiof_puts(BIO *bp, const char *str)-
248{-
249 if (bp->next_bio == NULL)
bp->next_bio == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
250 return (0);
never executed: return (0);
0
251 return (BIO_puts(bp->next_bio, str));
never executed: return (BIO_puts(bp->next_bio, str));
0
252}-
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