bf_nbio.c revision 215697
162321Salfred/* crypto/bio/bf_nbio.c */ 262321Salfred/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 362321Salfred * All rights reserved. 462321Salfred * 562321Salfred * This package is an SSL implementation written 662321Salfred * by Eric Young (eay@cryptsoft.com). 762321Salfred * The implementation was written so as to conform with Netscapes SSL. 862321Salfred * 962321Salfred * This library is free for commercial and non-commercial use as long as 1062321Salfred * the following conditions are aheared to. The following conditions 1162321Salfred * apply to all code found in this distribution, be it the RC4, RSA, 1262321Salfred * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1362321Salfred * included with this distribution is covered by the same copyright terms 1462321Salfred * except that the holder is Tim Hudson (tjh@cryptsoft.com). 1562321Salfred * 1662321Salfred * Copyright remains Eric Young's, and as such any Copyright notices in 1762321Salfred * the code are not to be removed. 1862321Salfred * If this package is used in a product, Eric Young should be given attribution 1962321Salfred * as the author of the parts of the library used. 2062321Salfred * This can be in the form of a textual message at program startup or 2162321Salfred * in documentation (online or textual) provided with the package. 2262321Salfred * 2362321Salfred * Redistribution and use in source and binary forms, with or without 2462321Salfred * modification, are permitted provided that the following conditions 2562321Salfred * are met: 2662321Salfred * 1. Redistributions of source code must retain the copyright 2762321Salfred * notice, this list of conditions and the following disclaimer. 2862321Salfred * 2. Redistributions in binary form must reproduce the above copyright 2962321Salfred * notice, this list of conditions and the following disclaimer in the 3062321Salfred * documentation and/or other materials provided with the distribution. 3162321Salfred * 3. All advertising materials mentioning features or use of this software 3262321Salfred * must display the following acknowledgement: 3362321Salfred * "This product includes cryptographic software written by 3462321Salfred * Eric Young (eay@cryptsoft.com)" 3562321Salfred * The word 'cryptographic' can be left out if the rouines from the library 3662321Salfred * being used are not cryptographic related :-). 3762321Salfred * 4. If you include any Windows specific code (or a derivative thereof) from 3862321Salfred * the apps directory (application code) you must include an acknowledgement: 3962321Salfred * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 4062321Salfred * 4162321Salfred * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4262321Salfred * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4362321Salfred * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4462321Salfred * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4562321Salfred * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4662321Salfred * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4762321Salfred * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4862321Salfred * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4962321Salfred * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5062321Salfred * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5162321Salfred * SUCH DAMAGE. 5262321Salfred * 5362321Salfred * The licence and distribution terms for any publically available version or 5462321Salfred * derivative of this code cannot be changed. i.e. this code cannot simply be 5562321Salfred * copied and put under another distribution licence 5662321Salfred * [including the GNU Public Licence.] 5762321Salfred */ 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 68static int nbiof_write(BIO *h,const char *buf,int num); 69static int nbiof_read(BIO *h,char *buf,int size); 70static int nbiof_puts(BIO *h,const char *str); 71static int nbiof_gets(BIO *h,char *str,int size); 72static long nbiof_ctrl(BIO *h,int cmd,long arg1,void *arg2); 73static int nbiof_new(BIO *h); 74static int nbiof_free(BIO *data); 75static long nbiof_callback_ctrl(BIO *h,int cmd,bio_info_cb *fp); 76typedef 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 83static 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 97BIO_METHOD *BIO_f_nbio_test(void) 98 { 99 return(&methods_nbiof); 100 } 101 102static 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 115static 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 126static 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 159static 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 204static 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 226static 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 240static 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 247static 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 } 252 253 254