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 /*
  66  * BIO_put and BIO_get both add to the digest, BIO_gets returns the digest
  67  */
  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     /* 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     BIO_TYPE_NBIO_TEST,
  85     "non-blocking IO test filter",
  86     nbiof_write,
  87     nbiof_read,
  88     nbiof_puts,
  89     nbiof_gets,
  90     nbiof_ctrl,
  91     nbiof_new,
  92     nbiof_free,
  93     nbiof_callback_ctrl,
  94 };
  95
  96 BIO_METHOD *BIO_f_nbio_test(void)
  97 {
  98     return (&methods_nbiof);
  99 }
 100
 101 static int nbiof_new(BIO *bi)
 102 {
 103     NBIO_TEST *nt;
 104
 105     if (!(nt = (NBIO_TEST *)OPENSSL_malloc(sizeof(NBIO_TEST))))
 106         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)
 118         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     int ret = 0;
 130 #if 1
 131     int num;
 132     unsigned char n;
 133 #endif
 134
 135     if (out == NULL)
 136         return (0);
 137     if (b->next_bio == NULL)
 138         return (0);
 139
 140     BIO_clear_retry_flags(b);
 141 #if 1
 142     RAND_pseudo_bytes(&n, 1);
 143     num = (n & 0x07);
 144
 145     if (outl > num)
 146         outl = num;
 147
 148     if (num == 0) {
 149         ret = -1;
 150         BIO_set_retry_read(b);
 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))
 169         return (0);
 170     if (b->next_bio == NULL)
 171         return (0);
 172     nt = (NBIO_TEST *)b->ptr;
 173
 174     BIO_clear_retry_flags(b);
 175
 176 #if 1
 177     if (nt->lwn > 0) {
 178         num = nt->lwn;
 179         nt->lwn = 0;
 180     } else {
 181         RAND_pseudo_bytes(&n, 1);
 182         num = (n & 7);
 183     }
 184
 185     if (inl > num)
 186         inl = num;
 187
 188     if (num == 0) {
 189         ret = -1;
 190         BIO_set_retry_write(b);
 191     } else
 192 #endif
 193     {
 194         ret = BIO_write(b->next_bio, in, inl);
 195         if (ret < 0) {
 196             BIO_copy_next_retry(b);
 197             nt->lwn = inl;
 198         }
 199     }
 200     return (ret);
 201 }
 202
 203 static long nbiof_ctrl(BIO *b, int cmd, long num, void *ptr)
 204 {
 205     long ret;
 206
 207     if (b->next_bio == NULL)
 208         return (0);
 209     switch (cmd) {
 210     case BIO_C_DO_STATE_MACHINE:
 211         BIO_clear_retry_flags(b);
 212         ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 213         BIO_copy_next_retry(b);
 214         break;
 215     case BIO_CTRL_DUP:
 216         ret = 0L;
 217         break;
 218     default:
 219         ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 220         break;
 221     }
 222     return (ret);
 223 }
 224
 225 static long nbiof_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
 226 {
 227     long ret = 1;
 228
 229     if (b->next_bio == NULL)
 230         return (0);
 231     switch (cmd) {
 232     default:
 233         ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
 234         break;
 235     }
 236     return (ret);
 237 }
 238
 239 static int nbiof_gets(BIO *bp, char *buf, int size)
 240 {
 241     if (bp->next_bio == NULL)
 242         return (0);
 243     return (BIO_gets(bp->next_bio, buf, size));
 244 }
 245
 246 static int nbiof_puts(BIO *bp, const char *str)
 247 {
 248     if (bp->next_bio == NULL)
 249         return (0);
 250     return (BIO_puts(bp->next_bio, str));
 251 }