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d02b48c6 | 1 | /* crypto/bio/bf_nbio.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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. | |
0f113f3e | 8 | * |
d02b48c6 RE |
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). | |
0f113f3e | 15 | * |
d02b48c6 RE |
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. | |
0f113f3e | 22 | * |
d02b48c6 RE |
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 :-). | |
0f113f3e | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 40 | * |
d02b48c6 RE |
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. | |
0f113f3e | 52 | * |
d02b48c6 RE |
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" | |
ec577822 BM |
62 | #include <openssl/rand.h> |
63 | #include <openssl/bio.h> | |
d02b48c6 | 64 | |
0f113f3e MC |
65 | /* |
66 | * BIO_put and BIO_get both add to the digest, BIO_gets returns the digest | |
67 | */ | |
d02b48c6 | 68 | |
0f113f3e MC |
69 | static int nbiof_write(BIO *h, const char *buf, int num); |
70 | static int nbiof_read(BIO *h, char *buf, int size); | |
71 | static int nbiof_puts(BIO *h, const char *str); | |
72 | static int nbiof_gets(BIO *h, char *str, int size); | |
73 | static long nbiof_ctrl(BIO *h, int cmd, long arg1, void *arg2); | |
d02b48c6 RE |
74 | static int nbiof_new(BIO *h); |
75 | static int nbiof_free(BIO *data); | |
0f113f3e MC |
76 | static long nbiof_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp); |
77 | typedef struct nbio_test_st { | |
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 | BIO_TYPE_NBIO_TEST, | |
85 | "non-blocking IO test filter", | |
86 | nbiof_write, | |
87 | nbiof_read, | |
88 | nbiof_puts, | |
89 | nbiof_gets, | |
90 | nbiof_ctrl, | |
91 | nbiof_new, | |
92 | nbiof_free, | |
93 | nbiof_callback_ctrl, | |
94 | }; | |
d02b48c6 | 95 | |
6b691a5c | 96 | BIO_METHOD *BIO_f_nbio_test(void) |
0f113f3e MC |
97 | { |
98 | return (&methods_nbiof); | |
99 | } | |
d02b48c6 | 100 | |
6b691a5c | 101 | static int nbiof_new(BIO *bi) |
0f113f3e MC |
102 | { |
103 | NBIO_TEST *nt; | |
104 | ||
105 | if (!(nt = (NBIO_TEST *)OPENSSL_malloc(sizeof(NBIO_TEST)))) | |
106 | 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 | } | |
d02b48c6 | 114 | |
6b691a5c | 115 | static int nbiof_free(BIO *a) |
0f113f3e MC |
116 | { |
117 | if (a == NULL) | |
118 | return (0); | |
119 | if (a->ptr != NULL) | |
120 | OPENSSL_free(a->ptr); | |
121 | a->ptr = NULL; | |
122 | a->init = 0; | |
123 | a->flags = 0; | |
124 | return (1); | |
125 | } | |
126 | ||
6b691a5c | 127 | static int nbiof_read(BIO *b, char *out, int outl) |
0f113f3e MC |
128 | { |
129 | int ret = 0; | |
0f113f3e MC |
130 | int num; |
131 | unsigned char n; | |
d02b48c6 | 132 | |
0f113f3e MC |
133 | if (out == NULL) |
134 | return (0); | |
135 | if (b->next_bio == NULL) | |
136 | return (0); | |
d02b48c6 | 137 | |
0f113f3e | 138 | BIO_clear_retry_flags(b); |
266483d2 MC |
139 | if (RAND_bytes(&n, 1) <= 0) |
140 | return -1; | |
0f113f3e | 141 | num = (n & 0x07); |
d02b48c6 | 142 | |
0f113f3e MC |
143 | if (outl > num) |
144 | outl = num; | |
d02b48c6 | 145 | |
0f113f3e MC |
146 | if (num == 0) { |
147 | ret = -1; | |
148 | BIO_set_retry_read(b); | |
6f91b017 | 149 | } else { |
0f113f3e MC |
150 | ret = BIO_read(b->next_bio, out, outl); |
151 | if (ret < 0) | |
152 | BIO_copy_next_retry(b); | |
153 | } | |
154 | return (ret); | |
155 | } | |
d02b48c6 | 156 | |
0e1c0612 | 157 | static int nbiof_write(BIO *b, const char *in, int inl) |
0f113f3e MC |
158 | { |
159 | NBIO_TEST *nt; | |
160 | int ret = 0; | |
161 | int num; | |
162 | unsigned char n; | |
d02b48c6 | 163 | |
0f113f3e MC |
164 | if ((in == NULL) || (inl <= 0)) |
165 | return (0); | |
166 | if (b->next_bio == NULL) | |
167 | return (0); | |
168 | nt = (NBIO_TEST *)b->ptr; | |
d02b48c6 | 169 | |
0f113f3e | 170 | BIO_clear_retry_flags(b); |
d02b48c6 | 171 | |
0f113f3e MC |
172 | if (nt->lwn > 0) { |
173 | num = nt->lwn; | |
174 | nt->lwn = 0; | |
175 | } else { | |
266483d2 MC |
176 | if (RAND_bytes(&n, 1) <= 0) |
177 | return -1; | |
0f113f3e MC |
178 | num = (n & 7); |
179 | } | |
180 | ||
181 | if (inl > num) | |
182 | inl = num; | |
183 | ||
184 | if (num == 0) { | |
185 | ret = -1; | |
186 | BIO_set_retry_write(b); | |
6f91b017 | 187 | } else { |
0f113f3e MC |
188 | ret = BIO_write(b->next_bio, in, inl); |
189 | if (ret < 0) { | |
190 | BIO_copy_next_retry(b); | |
191 | nt->lwn = inl; | |
192 | } | |
193 | } | |
194 | return (ret); | |
195 | } | |
d02b48c6 | 196 | |
0e1c0612 | 197 | static long nbiof_ctrl(BIO *b, int cmd, long num, void *ptr) |
0f113f3e MC |
198 | { |
199 | long ret; | |
200 | ||
201 | if (b->next_bio == NULL) | |
202 | return (0); | |
203 | switch (cmd) { | |
204 | case BIO_C_DO_STATE_MACHINE: | |
205 | BIO_clear_retry_flags(b); | |
206 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
207 | BIO_copy_next_retry(b); | |
208 | break; | |
209 | case BIO_CTRL_DUP: | |
210 | ret = 0L; | |
211 | break; | |
212 | default: | |
213 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr); | |
214 | break; | |
215 | } | |
216 | return (ret); | |
217 | } | |
d02b48c6 | 218 | |
13083215 | 219 | static long nbiof_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp) |
0f113f3e MC |
220 | { |
221 | long ret = 1; | |
222 | ||
223 | if (b->next_bio == NULL) | |
224 | return (0); | |
225 | switch (cmd) { | |
226 | default: | |
227 | ret = BIO_callback_ctrl(b->next_bio, cmd, fp); | |
228 | break; | |
229 | } | |
230 | return (ret); | |
231 | } | |
d3442bc7 | 232 | |
6b691a5c | 233 | static int nbiof_gets(BIO *bp, char *buf, int size) |
0f113f3e MC |
234 | { |
235 | if (bp->next_bio == NULL) | |
236 | return (0); | |
237 | return (BIO_gets(bp->next_bio, buf, size)); | |
238 | } | |
d02b48c6 | 239 | |
0e1c0612 | 240 | static int nbiof_puts(BIO *bp, const char *str) |
0f113f3e MC |
241 | { |
242 | if (bp->next_bio == NULL) | |
243 | return (0); | |
244 | return (BIO_puts(bp->next_bio, str)); | |
245 | } |