crypto/openssl-0.9/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
  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         NBIO_TEST *nt;
 129         int ret=0;
 130 #if 1
 131         int num;
 132         unsigned char n;
 133 #endif
 134
 135         if (out == NULL) return(0);
 136         if (b->next_bio == NULL) return(0);
 137         nt=(NBIO_TEST *)b->ptr;
 138
 139         BIO_clear_retry_flags(b);
 140 #if 1
 141         RAND_pseudo_bytes(&n,1);
 142         num=(n&0x07);
 143
 144         if (outl > num) outl=num;
 145
 146         if (num == 0)
 147                 {
 148                 ret= -1;
 149                 BIO_set_retry_read(b);
 150                 }
 151         else
 152 #endif
 153                 {
 154                 ret=BIO_read(b->next_bio,out,outl);
 155                 if (ret < 0)
 156                         BIO_copy_next_retry(b);
 157                 }
 158         return(ret);
 159         }
 160
 161 static int nbiof_write(BIO *b, const char *in, int inl)
 162         {
 163         NBIO_TEST *nt;
 164         int ret=0;
 165         int num;
 166         unsigned char n;
 167
 168         if ((in == NULL) || (inl <= 0)) return(0);
 169         if (b->next_bio == NULL) return(0);
 170         nt=(NBIO_TEST *)b->ptr;
 171
 172         BIO_clear_retry_flags(b);
 173
 174 #if 1
 175         if (nt->lwn > 0)
 176                 {
 177                 num=nt->lwn;
 178                 nt->lwn=0;
 179                 }
 180         else
 181                 {
 182                 RAND_pseudo_bytes(&n,1);
 183                 num=(n&7);
 184                 }
 185
 186         if (inl > num) inl=num;
 187
 188         if (num == 0)
 189                 {
 190                 ret= -1;
 191                 BIO_set_retry_write(b);
 192                 }
 193         else
 194 #endif
 195                 {
 196                 ret=BIO_write(b->next_bio,in,inl);
 197                 if (ret < 0)
 198                         {
 199                         BIO_copy_next_retry(b);
 200                         nt->lwn=inl;
 201                         }
 202                 }
 203         return(ret);
 204         }
 205
 206 static long nbiof_ctrl(BIO *b, int cmd, long num, void *ptr)
 207         {
 208         long ret;
 209
 210         if (b->next_bio == NULL) return(0);
 211         switch (cmd)
 212                 {
 213         case BIO_C_DO_STATE_MACHINE:
 214                 BIO_clear_retry_flags(b);
 215                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 216                 BIO_copy_next_retry(b);
 217                 break;
 218         case BIO_CTRL_DUP:
 219                 ret=0L;
 220                 break;
 221         default:
 222                 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 223                 break;
 224                 }
 225         return(ret);
 226         }
 227
 228 static long nbiof_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
 229         {
 230         long ret=1;
 231
 232         if (b->next_bio == NULL) return(0);
 233         switch (cmd)
 234                 {
 235         default:
 236                 ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
 237                 break;
 238                 }
 239         return(ret);
 240         }
 241
 242 static int nbiof_gets(BIO *bp, char *buf, int size)
 243         {
 244         if (bp->next_bio == NULL) return(0);
 245         return(BIO_gets(bp->next_bio,buf,size));
 246         }
 247
 248
 249 static int nbiof_puts(BIO *bp, const char *str)
 250         {
 251         if (bp->next_bio == NULL) return(0);
 252         return(BIO_puts(bp->next_bio,str));
 253         }
 254
 255