Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | |