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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 <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 } | |
252 | |
253 | |
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