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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 "rand.h"
63#include "bio.h"
64#include "evp.h"
65
66/* BIO_put and BIO_get both add to the digest,
67 * BIO_gets returns the digest */
68
69#ifndef NOPROTO
70static int nbiof_write(BIO *h,char *buf,int num);
71static int nbiof_read(BIO *h,char *buf,int size);
72static int nbiof_puts(BIO *h,char *str);
73static int nbiof_gets(BIO *h,char *str,int size);
74static long nbiof_ctrl(BIO *h,int cmd,long arg1,char *arg2);
75static int nbiof_new(BIO *h);
76static int nbiof_free(BIO *data);
77#else
78static int nbiof_write();
79static int nbiof_read();
80static int nbiof_puts();
81static int nbiof_gets();
82static long nbiof_ctrl();
83static int nbiof_new();
84static int nbiof_free();
85#endif
86
87typedef struct nbio_test_st
88 {
89 /* only set if we sent a 'should retry' error */
90 int lrn;
91 int lwn;
92 } NBIO_TEST;
93
94static BIO_METHOD methods_nbiof=
95 {
96 BIO_TYPE_NBIO_TEST,
97 "non-blocking IO test filter",
98 nbiof_write,
99 nbiof_read,
100 nbiof_puts,
101 nbiof_gets,
102 nbiof_ctrl,
103 nbiof_new,
104 nbiof_free,
105 };
106
107BIO_METHOD *BIO_f_nbio_test()
108 {
109 return(&methods_nbiof);
110 }
111
112static int nbiof_new(bi)
113BIO *bi;
114 {
115 NBIO_TEST *nt;
116
117 nt=(NBIO_TEST *)Malloc(sizeof(NBIO_TEST));
118 nt->lrn= -1;
119 nt->lwn= -1;
120 bi->ptr=(char *)nt;
121 bi->init=1;
122 bi->flags=0;
123 return(1);
124 }
125
126static int nbiof_free(a)
127BIO *a;
128 {
129 if (a == NULL) return(0);
130 if (a->ptr != NULL)
131 Free(a->ptr);
132 a->ptr=NULL;
133 a->init=0;
134 a->flags=0;
135 return(1);
136 }
137
138static int nbiof_read(b,out,outl)
139BIO *b;
140char *out;
141int outl;
142 {
143 NBIO_TEST *nt;
144 int ret=0;
145#if 0
146 int num;
147 unsigned char n;
148#endif
149
150 if (out == NULL) return(0);
151 if (b->next_bio == NULL) return(0);
152 nt=(NBIO_TEST *)b->ptr;
153
154 BIO_clear_retry_flags(b);
155#if 0
156 RAND_bytes(&n,1);
157 num=(n&0x07);
158
159 if (outl > num) outl=num;
160
161 if (num == 0)
162 {
163 ret= -1;
164 BIO_set_retry_read(b);
165 }
166 else
167#endif
168 {
169 ret=BIO_read(b->next_bio,out,outl);
170 if (ret < 0)
171 BIO_copy_next_retry(b);
172 }
173 return(ret);
174 }
175
176static int nbiof_write(b,in,inl)
177BIO *b;
178char *in;
179int inl;
180 {
181 NBIO_TEST *nt;
182 int ret=0;
183 int num;
184 unsigned char n;
185
186 if ((in == NULL) || (inl <= 0)) return(0);
187 if (b->next_bio == NULL) return(0);
188 nt=(NBIO_TEST *)b->ptr;
189
190 BIO_clear_retry_flags(b);
191
192#if 1
193 if (nt->lwn > 0)
194 {
195 num=nt->lwn;
196 nt->lwn=0;
197 }
198 else
199 {
200 RAND_bytes(&n,1);
201 num=(n&7);
202 }
203
204 if (inl > num) inl=num;
205
206 if (num == 0)
207 {
208 ret= -1;
209 BIO_set_retry_write(b);
210 }
211 else
212#endif
213 {
214 ret=BIO_write(b->next_bio,in,inl);
215 if (ret < 0)
216 {
217 BIO_copy_next_retry(b);
218 nt->lwn=inl;
219 }
220 }
221 return(ret);
222 }
223
224static long nbiof_ctrl(b,cmd,num,ptr)
225BIO *b;
226int cmd;
227long num;
228char *ptr;
229 {
230 long ret;
231
232 if (b->next_bio == NULL) return(0);
233 switch (cmd)
234 {
235 case BIO_C_DO_STATE_MACHINE:
236 BIO_clear_retry_flags(b);
237 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
238 BIO_copy_next_retry(b);
239 break;
240 case BIO_CTRL_DUP:
241 ret=0L;
242 break;
243 default:
244 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
245 break;
246 }
247 return(ret);
248 }
249
250static int nbiof_gets(bp,buf,size)
251BIO *bp;
252char *buf;
253int size;
254 {
255 if (bp->next_bio == NULL) return(0);
256 return(BIO_gets(bp->next_bio,buf,size));
257 }
258
259
260static int nbiof_puts(bp,str)
261BIO *bp;
262char *str;
263 {
264 if (bp->next_bio == NULL) return(0);
265 return(BIO_puts(bp->next_bio,str));
266 }
267
268
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