crypto/bio/bf_nbio.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) from
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57
  58 #include <stdio.h>
  59 #include <errno.h>
  60 #include "internal/cryptlib.h"
  61 #include <openssl/rand.h>
  62 #include <openssl/bio.h>
  63
  64 /*
  65  * BIO_put and BIO_get both add to the digest, BIO_gets returns the digest
  66  */
  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     /* only set if we sent a 'should retry' error */
  78     int lrn;
  79     int lwn;
  80 } NBIO_TEST;
  81
  82 static BIO_METHOD methods_nbiof = {
  83     BIO_TYPE_NBIO_TEST,
  84     "non-blocking IO test filter",
  85     nbiof_write,
  86     nbiof_read,
  87     nbiof_puts,
  88     nbiof_gets,
  89     nbiof_ctrl,
  90     nbiof_new,
  91     nbiof_free,
  92     nbiof_callback_ctrl,
  93 };
  94
  95 BIO_METHOD *BIO_f_nbio_test(void)
  96 {
  97     return (&methods_nbiof);
  98 }
  99
 100 static int nbiof_new(BIO *bi)
 101 {
 102     NBIO_TEST *nt;
 103
 104     if ((nt = OPENSSL_zalloc(sizeof(*nt))) == NULL)
 105         return (0);
 106     nt->lrn = -1;
 107     nt->lwn = -1;
 108     bi->ptr = (char *)nt;
 109     bi->init = 1;
 110     return (1);
 111 }
 112
 113 static int nbiof_free(BIO *a)
 114 {
 115     if (a == NULL)
 116         return (0);
 117     OPENSSL_free(a->ptr);
 118     a->ptr = NULL;
 119     a->init = 0;
 120     a->flags = 0;
 121     return (1);
 122 }
 123
 124 static int nbiof_read(BIO *b, char *out, int outl)
 125 {
 126     int ret = 0;
 127     int num;
 128     unsigned char n;
 129
 130     if (out == NULL)
 131         return (0);
 132     if (b->next_bio == NULL)
 133         return (0);
 134
 135     BIO_clear_retry_flags(b);
 136     if (RAND_bytes(&n, 1) <= 0)
 137         return -1;
 138     num = (n & 0x07);
 139
 140     if (outl > num)
 141         outl = num;
 142
 143     if (num == 0) {
 144         ret = -1;
 145         BIO_set_retry_read(b);
 146     } else {
 147         ret = BIO_read(b->next_bio, out, outl);
 148         if (ret < 0)
 149             BIO_copy_next_retry(b);
 150     }
 151     return (ret);
 152 }
 153
 154 static int nbiof_write(BIO *b, const char *in, int inl)
 155 {
 156     NBIO_TEST *nt;
 157     int ret = 0;
 158     int num;
 159     unsigned char n;
 160
 161     if ((in == NULL) || (inl <= 0))
 162         return (0);
 163     if (b->next_bio == NULL)
 164         return (0);
 165     nt = (NBIO_TEST *)b->ptr;
 166
 167     BIO_clear_retry_flags(b);
 168
 169     if (nt->lwn > 0) {
 170         num = nt->lwn;
 171         nt->lwn = 0;
 172     } else {
 173         if (RAND_bytes(&n, 1) <= 0)
 174             return -1;
 175         num = (n & 7);
 176     }
 177
 178     if (inl > num)
 179         inl = num;
 180
 181     if (num == 0) {
 182         ret = -1;
 183         BIO_set_retry_write(b);
 184     } else {
 185         ret = BIO_write(b->next_bio, in, inl);
 186         if (ret < 0) {
 187             BIO_copy_next_retry(b);
 188             nt->lwn = inl;
 189         }
 190     }
 191     return (ret);
 192 }
 193
 194 static long nbiof_ctrl(BIO *b, int cmd, long num, void *ptr)
 195 {
 196     long ret;
 197
 198     if (b->next_bio == NULL)
 199         return (0);
 200     switch (cmd) {
 201     case BIO_C_DO_STATE_MACHINE:
 202         BIO_clear_retry_flags(b);
 203         ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 204         BIO_copy_next_retry(b);
 205         break;
 206     case BIO_CTRL_DUP:
 207         ret = 0L;
 208         break;
 209     default:
 210         ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 211         break;
 212     }
 213     return (ret);
 214 }
 215
 216 static long nbiof_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
 217 {
 218     long ret = 1;
 219
 220     if (b->next_bio == NULL)
 221         return (0);
 222     switch (cmd) {
 223     default:
 224         ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
 225         break;
 226     }
 227     return (ret);
 228 }
 229
 230 static int nbiof_gets(BIO *bp, char *buf, int size)
 231 {
 232     if (bp->next_bio == NULL)
 233         return (0);
 234     return (BIO_gets(bp->next_bio, buf, size));
 235 }
 236
 237 static int nbiof_puts(BIO *bp, const char *str)
 238 {
 239     if (bp->next_bio == NULL)
 240         return (0);
 241     return (BIO_puts(bp->next_bio, str));
 242 }