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/*
* 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_error_message:
* create a ERROR_MESSAGE packet; return -1 on failure, 0 on success
*
*/
#ifndef lint
static char rcsid[] = "$Id: photuris_error_message.c,v 1.2 1997/09/02 17:26:45 provos Exp $";
#endif
#include <stdio.h>
#include <string.h>
#include "config.h"
#include "photuris.h"
#include "packets.h"
#include "state.h"
#include "cookie.h"
int
photuris_error_message(struct stateob *st, u_char *buffer, int *size,
char *icookie, char *rcookie, u_int8_t counter,
u_int8_t error_type)
{
struct error_message *header;
if (*size < ERROR_MESSAGE_PACKET_SIZE +
(error_type == RESOURCE_LIMIT ? 1 : 0))
return -1; /* buffer not large enough */
header = (struct error_message *) buffer;
*size = ERROR_MESSAGE_PACKET_SIZE +
(error_type == RESOURCE_LIMIT ? 1 : 0);
bcopy(icookie, header->icookie, COOKIE_SIZE);
bcopy(rcookie, header->rcookie, COOKIE_SIZE);
header->type = error_type;
if (error_type == RESOURCE_LIMIT) {
int i;
buffer[ERROR_MESSAGE_PACKET_SIZE] = counter;
for(i = 0; i<COOKIE_SIZE; i++)
if (rcookie[i] != 0)
break;
if (i != COOKIE_SIZE || counter != 0)
return 0;
if (st != NULL) {
bcopy(st->rcookie, header->rcookie, COOKIE_SIZE);
buffer[ERROR_MESSAGE_PACKET_SIZE] = st->counter;
}
}
return 0;
}
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