1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
/*
* Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Niels Provos.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* photuris_cookie_request:
* create a COOKIE_REQUEST packet; return -1 on failure, 0 on success
*
*/
#ifndef lint
static char rcsid[] = "$Id: photuris_cookie_request.c,v 1.2 2000/12/15 02:42:08 provos Exp $";
#endif
#include <stdio.h>
#include <string.h> /* XXX - get header files right */
#include <strings.h>
#include <time.h>
#include <sys/time.h>
#include "config.h"
#include "photuris.h"
#include "packets.h"
#include "state.h"
#include "cookie.h"
int
photuris_cookie_request(struct stateob *st, u_char *buffer, int *size)
{
struct cookie_request *header;
struct stateob *prev_st, *old_st;
time_t timeout = 0;
if (*size < COOKIE_REQUEST_PACKET_SIZE)
return -1; /* buffer not large enough */
header = (struct cookie_request *) buffer;
*size = COOKIE_REQUEST_PACKET_SIZE; /* fixed size */
if (st->counter == 0) {
old_st = NULL;
for (prev_st = state_find(st->address); prev_st;
prev_st = TAILQ_NEXT(prev_st, next)) {
if (prev_st->lifetime >= timeout) {
timeout = prev_st->lifetime;
old_st = prev_st;
}
}
/* Check if we have an exchange going already */
if (old_st != NULL && old_st != st && timeout > time(NULL)) {
if (old_st->initiator) {
bcopy(old_st->rcookie, st->rcookie, COOKIE_SIZE);
st->counter = old_st->counter;
} else {
bcopy(old_st->icookie, st->rcookie, COOKIE_SIZE);
st->counter = 0;
}
}
}
cookie_generate(st, st->icookie, COOKIE_SIZE, NULL, 0);
st->phase = COOKIE_REQUEST;
st->lifetime = exchange_timeout + time(NULL);
bcopy(st->icookie, header->icookie, COOKIE_SIZE);
bcopy(st->rcookie, header->rcookie, COOKIE_SIZE);
header->counter = st->counter; /* set to zero or prev. */
header->type = COOKIE_REQUEST;
return 0;
}
|
