s23_pkt.c revision 312826 
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/*
67 * Return values are as per SSL_write()
68 */
69int ssl23_write_bytes(SSL *s)
70{
71    int i, num, tot;
72    char *buf;
73
74    buf = s->init_buf->data;
75    tot = s->init_off;
76    num = s->init_num;
77    for (;;) {
78        s->rwstate = SSL_WRITING;
79        i = BIO_write(s->wbio, &(buf[tot]), num);
80        if (i <= 0) {
81            s->init_off = tot;
82            s->init_num = num;
83            return i;
84        }
85        s->rwstate = SSL_NOTHING;
86        if (i == num)
87            return (tot + i);
88
89        num -= i;
90        tot += i;
91    }
92}
93
94/* return regularly only when we have read (at least) 'n' bytes
95 *
96 * Return values are as per SSL_read()
97 */
98int ssl23_read_bytes(SSL *s, int n)
99{
100    unsigned char *p;
101    int j;
102
103    if (s->packet_length < (unsigned int)n) {
104        p = s->packet;
105
106        for (;;) {
107            s->rwstate = SSL_READING;
108            j = BIO_read(s->rbio, (char *)&(p[s->packet_length]),
109                         n - s->packet_length);
110            if (j <= 0)
111                return j;
112            s->rwstate = SSL_NOTHING;
113            s->packet_length += j;
114            if (s->packet_length >= (unsigned int)n)
115                return (s->packet_length);
116        }
117    }
118    return (n);
119}
120