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 #include <openssl/evp.h> 65 66 /* BIO_put and BIO_get both add to the digest, 67 * BIO_gets returns the digest */ 68 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); 74 static int nbiof_new(BIO *h); 75 static int nbiof_free(BIO *data); 76 static long nbiof_callback_ctrl(BIO *h,int cmd,bio_info_cb *fp); 77 typedef struct nbio_test_st 78 { 79 /* only set if we sent a 'should retry' error */ 80 int lrn; 81 int lwn; 82 } NBIO_TEST; 83 84 static BIO_METHOD methods_nbiof= 85 { 86 BIO_TYPE_NBIO_TEST, 87 "non-blocking IO test filter", 88 nbiof_write, 89 nbiof_read, 90 nbiof_puts, 91 nbiof_gets, 92 nbiof_ctrl, 93 nbiof_new, 94 nbiof_free, 95 nbiof_callback_ctrl, 96 }; 97 98 BIO_METHOD *BIO_f_nbio_test(void) 99 { 100 return(&methods_nbiof); 101 } 102 103 static int nbiof_new(BIO *bi) 104 { 105 NBIO_TEST *nt; 106 107 nt=(NBIO_TEST *)OPENSSL_malloc(sizeof(NBIO_TEST)); 108 nt->lrn= -1; 109 nt->lwn= -1; 110 bi->ptr=(char *)nt; 111 bi->init=1; 112 bi->flags=0; 113 return(1); 114 } 115 116 static int nbiof_free(BIO *a) 117 { 118 if (a == NULL) 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 } 126 127 static int nbiof_read(BIO *b, char *out, int outl) 128 { 129 NBIO_TEST *nt; 130 int ret=0; 131 #if 0 132 int num; 133 unsigned char n; 134 #endif 135 136 if (out == NULL) return(0); 137 if (b->next_bio == NULL) return(0); 138 nt=(NBIO_TEST *)b->ptr; 139 140 BIO_clear_retry_flags(b); 141 #if 0 142 RAND_pseudo_bytes(&n,1); 143 num=(n&0x07); 144 145 if (outl > num) outl=num; 146 147 if (num == 0) 148 { 149 ret= -1; 150 BIO_set_retry_read(b); 151 } 152 else 153 #endif 154 { 155 ret=BIO_read(b->next_bio,out,outl); 156 if (ret < 0) 157 BIO_copy_next_retry(b); 158 } 159 return(ret); 160 } 161 162 static int nbiof_write(BIO *b, const char *in, int inl) 163 { 164 NBIO_TEST *nt; 165 int ret=0; 166 int num; 167 unsigned char n; 168 169 if ((in == NULL) || (inl <= 0)) return(0); 170 if (b->next_bio == NULL) return(0); 171 nt=(NBIO_TEST *)b->ptr; 172 173 BIO_clear_retry_flags(b); 174 175 #if 1 176 if (nt->lwn > 0) 177 { 178 num=nt->lwn; 179 nt->lwn=0; 180 } 181 else 182 { 183 RAND_pseudo_bytes(&n,1); 184 num=(n&7); 185 } 186 187 if (inl > num) inl=num; 188 189 if (num == 0) 190 { 191 ret= -1; 192 BIO_set_retry_write(b); 193 } 194 else 195 #endif 196 { 197 ret=BIO_write(b->next_bio,in,inl); 198 if (ret < 0) 199 { 200 BIO_copy_next_retry(b); 201 nt->lwn=inl; 202 } 203 } 204 return(ret); 205 } 206 207 static long nbiof_ctrl(BIO *b, int cmd, long num, void *ptr) 208 { 209 long ret; 210 211 if (b->next_bio == NULL) return(0); 212 switch (cmd) 213 { 214 case BIO_C_DO_STATE_MACHINE: 215 BIO_clear_retry_flags(b); 216 ret=BIO_ctrl(b->next_bio,cmd,num,ptr); 217 BIO_copy_next_retry(b); 218 break; 219 case BIO_CTRL_DUP: 220 ret=0L; 221 break; 222 default: 223 ret=BIO_ctrl(b->next_bio,cmd,num,ptr); 224 break; 225 } 226 return(ret); 227 } 228 229 static long nbiof_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp) 230 { 231 long ret=1; 232 233 if (b->next_bio == NULL) return(0); 234 switch (cmd) 235 { 236 default: 237 ret=BIO_callback_ctrl(b->next_bio,cmd,fp); 238 break; 239 } 240 return(ret); 241 } 242 243 static int nbiof_gets(BIO *bp, char *buf, int size) 244 { 245 if (bp->next_bio == NULL) return(0); 246 return(BIO_gets(bp->next_bio,buf,size)); 247 } 248 249 250 static int nbiof_puts(BIO *bp, const char *str) 251 { 252 if (bp->next_bio == NULL) return(0); 253 return(BIO_puts(bp->next_bio,str)); 254 } 255 256 257