/home/jander/temp/etherdune/ICMPPinger.cpp

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// EtherDune ICMP Pinger class
// Author: Javier Peletier <jm@friendev.com>
// Summary: Implements an ICMP Echo request service
//
// Copyright (c) 2015 All Rights Reserved, http://friendev.com
//
// This source is subject to the GPLv2 license.
// Please see the License.txt file for more information.
// All other rights reserved.
//
// THIS CODE AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY 
// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.

#include "ICMPPinger.h"

bool ICMPPinger::onICMPMessage()
{
    if (packet.icmp.type != ICMP_TYPE_ECHOREPLY)
        return false;

    if (!loadAll())
        return true; //checksum error, drop packet.

    uint8_t len = ICMP_PING_DATA_LENGTH;
    for (uint8_t* ptr = (uint8_t*)(&packet.icmp) + sizeof(ICMPHeader); len > 0; len--, ptr++)
    {
        if (*ptr != 0x79)
            return true;
    }

    onPingReply(millis() - packet.icmp.timestamp);
    return true;
}


void ICMPPinger::ping(const IPAddress& targetIP)
{
    memset(packet.icmp.dataStart(), 0x79, ICMP_PING_DATA_LENGTH);
    packet.icmp.type = ICMP_TYPE_ECHOREQUEST;
    packet.icmp.code = 0;
    packet.icmp.timestamp = millis();

    packet.icmp.checksum = 0;

    sendICMPPacket(targetIP, ICMP_PING_DATA_LENGTH);
}