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 <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,void (*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, void (*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