crypto/openssl/ssl/s23_pkt.c

   1 /* ssl/s23_pkt.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 #define USE_SOCKETS
  62 #include "ssl_locl.h"
  63 #include <openssl/evp.h>
  64 #include <openssl/buffer.h>
  65
  66 int ssl23_write_bytes(SSL *s)
  67 {
  68     int i, num, tot;
  69     char *buf;
  70
  71     buf = s->init_buf->data;
  72     tot = s->init_off;
  73     num = s->init_num;
  74     for (;;) {
  75         s->rwstate = SSL_WRITING;
  76         i = BIO_write(s->wbio, &(buf[tot]), num);
  77         if (i <= 0) {
  78             s->init_off = tot;
  79             s->init_num = num;
  80             return (i);
  81         }
  82         s->rwstate = SSL_NOTHING;
  83         if (i == num)
  84             return (tot + i);
  85
  86         num -= i;
  87         tot += i;
  88     }
  89 }
  90
  91 /* return regularly only when we have read (at least) 'n' bytes */
  92 int ssl23_read_bytes(SSL *s, int n)
  93 {
  94     unsigned char *p;
  95     int j;
  96
  97     if (s->packet_length < (unsigned int)n) {
  98         p = s->packet;
  99
 100         for (;;) {
 101             s->rwstate = SSL_READING;
 102             j = BIO_read(s->rbio, (char *)&(p[s->packet_length]),
 103                          n - s->packet_length);
 104             if (j <= 0)
 105                 return (j);
 106             s->rwstate = SSL_NOTHING;
 107             s->packet_length += j;
 108             if (s->packet_length >= (unsigned int)n)
 109                 return (s->packet_length);
 110         }
 111     }
 112     return (n);
 113 }