/*
 * Copyright (c) 2009 Lukas Mejdrech
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - 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.
 */

/** @addtogroup libnet
 * @{
 */

/** @file
 * ICMP client interface implementation.
 * @see icmp_client.h
 */

#include <icmp_client.h>
#include <icmp_header.h>
#include <packet_client.h>

#ifdef CONFIG_DEBUG
#include <stdio.h>
#endif

#include <errno.h>
#include <sys/types.h>

#include <net/icmp_codes.h>
#include <net/packet.h>

/** Processes the received packet prefixed with an ICMP header.
 *
 * @param[in] packet	The received packet.
 * @param[out] type	The ICMP header type.
 * @param[out] code	The ICMP header code.
 * @param[out] pointer	The ICMP header pointer.
 * @param[out] mtu	The ICMP header MTU.
 * @return		The ICMP header length.
 * @return		Zero if the packet contains no data.
 */
int
icmp_client_process_packet(packet_t *packet, icmp_type_t *type,
    icmp_code_t *code, icmp_param_t *pointer, icmp_param_t *mtu)
{
	icmp_header_t *header;

	header = (icmp_header_t *) packet_get_data(packet);
	if (!header ||
	    (packet_get_data_length(packet) < sizeof(icmp_header_t))) {
		return 0;
	}

	if (type)
		*type = header->type;
	if (code)
		*code = header->code;
	if (pointer)
		*pointer = header->un.param.pointer;
	if (mtu)
		*mtu = header->un.frag.mtu;

	/* Remove debug dump */
#ifdef CONFIG_DEBUG
	printf("ICMP error %d (%d) in packet %d\n", header->type, header->code,
	    packet_get_id(packet));
#endif
	return sizeof(icmp_header_t);
}

/** Returns the ICMP header length.
 *
 * @param[in] packet	The packet.
 * @return		The ICMP header length in bytes.
 */
size_t icmp_client_header_length(packet_t *packet)
{
	if (packet_get_data_length(packet) < sizeof(icmp_header_t))
		return 0;

	return sizeof(icmp_header_t);
}

/** @}
 */