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