crypto/bio/bf_nbio.c

   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 "rand.h"
  63 #include "bio.h"
  64 #include "evp.h"
  65
  66 /* BIO_put and BIO_get both add to the digest,
  67  * BIO_gets returns the digest */
  68
  69 #ifndef NOPROTO
  70 static int nbiof_write(BIO *h,char *buf,int num);
  71 static int nbiof_read(BIO *h,char *buf,int size);
  72 static int nbiof_puts(BIO *h,char *str);
  73 static int nbiof_gets(BIO *h,char *str,int size);
  74 static long nbiof_ctrl(BIO *h,int cmd,long arg1,char *arg2);
  75 static int nbiof_new(BIO *h);
  76 static int nbiof_free(BIO *data);
  77 #else
  78 static int nbiof_write();
  79 static int nbiof_read();
  80 static int nbiof_puts();
  81 static int nbiof_gets();
  82 static long nbiof_ctrl();
  83 static int nbiof_new();
  84 static int nbiof_free();
  85 #endif
  86
  87 typedef struct nbio_test_st
  88         {
  89         /* only set if we sent a 'should retry' error */
  90         int lrn;
  91         int lwn;
  92         } NBIO_TEST;
  93
  94 static BIO_METHOD methods_nbiof=
  95         {
  96         BIO_TYPE_NBIO_TEST,
  97         "non-blocking IO test filter",
  98         nbiof_write,
  99         nbiof_read,
 100         nbiof_puts,
 101         nbiof_gets,
 102         nbiof_ctrl,
 103         nbiof_new,
 104         nbiof_free,
 105         };
 106
 107 BIO_METHOD *BIO_f_nbio_test()
 108         {
 109         return(&methods_nbiof);
 110         }
 111
 112 static int nbiof_new(bi)
 113 BIO *bi;
 114         {
 115         NBIO_TEST *nt;
 116
 117         nt=(NBIO_TEST *)Malloc(sizeof(NBIO_TEST));
 118         nt->lrn= -1;
 119         nt->lwn= -1;
 120         bi->ptr=(char *)nt;
 121         bi->init=1;
 122         bi->flags=0;
 123         return(1);
 124         }
 125
 126 static int nbiof_free(a)
 127 BIO *a;
 128         {
 129         if (a == NULL) return(0);
 130         if (a->ptr != NULL)
 131                 Free(a->ptr);
 132         a->ptr=NULL;
 133         a->init=0;
 134         a->flags=0;
 135         return(1);
 136         }
 137
 138 static int nbiof_read(b,out,outl)
 139 BIO *b;
 140 char *out;
 141 int outl;
 142         {
 143         NBIO_TEST *nt;
 144         int ret=0;
 145 #if 0
 146         int num;
 147         unsigned char n;
 148 #endif
 149
 150         if (out == NULL) return(0);
 151         if (b->next_bio == NULL) return(0);
 152         nt=(NBIO_TEST *)b->ptr;
 153
 154         BIO_clear_retry_flags(b);
 155 #if 0
 156         RAND_bytes(&n,1);
 157         num=(n&0x07);
 158
 159         if (outl > num) outl=num;
 160
 161         if (num == 0)
 162                 {
 163                 ret= -1;
 164                 BIO_set_retry_read(b);
 165                 }
 166         else
 167 #endif
 168                 {
 169                 ret=BIO_read(b->next_bio,out,outl);
 170                 if (ret < 0)
 171                         BIO_copy_next_retry(b);
 172                 }
 173         return(ret);
 174         }
 175
 176 static int nbiof_write(b,in,inl)
 177 BIO *b;
 178 char *in;
 179 int inl;
 180         {
 181         NBIO_TEST *nt;
 182         int ret=0;
 183         int num;
 184         unsigned char n;
 185
 186         if ((in == NULL) || (inl <= 0)) return(0);
 187         if (b->next_bio == NULL) return(0);
 188         nt=(NBIO_TEST *)b->ptr;
 189
 190         BIO_clear_retry_flags(b);
 191
 192 #if 1
 193         if (nt->lwn > 0)
 194                 {
 195                 num=nt->lwn;
 196                 nt->lwn=0;
 197                 }
 198         else
 199                 {
 200                 RAND_bytes(&n,1);
 201                 num=(n&7);
 202                 }
 203
 204         if (inl > num) inl=num;
 205
 206         if (num == 0)
 207                 {
 208                 ret= -1;
 209                 BIO_set_retry_write(b);
 210                 }
 211         else
 212 #endif
 213                 {
 214                 ret=BIO_write(b->next_bio,in,inl);
 215                 if (ret < 0)
 216                         {
 217                         BIO_copy_next_retry(b);
 218                         nt->lwn=inl;
 219                         }
 220                 }
 221         return(ret);
 222         }
 223
 224 static long nbiof_ctrl(b,cmd,num,ptr)
 225 BIO *b;
 226 int cmd;
 227 long num;
 228 char *ptr;
 229         {
 230         long ret;
 231
 232         if (b->next_bio == NULL) return(0);
 233         switch (cmd)
 234                 {
 235         case BIO_C_DO_STATE_MACHINE:
 236                 BIO_clear_retry_flags(b);
 237                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 238                 BIO_copy_next_retry(b);
 239                 break;
 240         case BIO_CTRL_DUP:
 241                 ret=0L;
 242                 break;
 243         default:
 244                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 245                 break;
 246                 }
 247         return(ret);
 248         }
 249
 250 static int nbiof_gets(bp,buf,size)
 251 BIO *bp;
 252 char *buf;
 253 int size;
 254         {
 255         if (bp->next_bio == NULL) return(0);
 256         return(BIO_gets(bp->next_bio,buf,size));
 257         }
 258
 259
 260 static int nbiof_puts(bp,str)
 261 BIO *bp;
 262 char *str;
 263         {
 264         if (bp->next_bio == NULL) return(0);
 265         return(BIO_puts(bp->next_bio,str));
 266         }
 267
 268