//

// ICMPPacketImpl.cpp

//

// $Id: //poco/1.4/Net/src/ICMPPacketImpl.cpp#2 $

//

// Library: Net

// Package: ICMP

// Module: ICMPPacketImpl

//

// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.

// and Contributors.

//

// SPDX-License-Identifier: BSL-1.0

//

#include "Poco/Net/ICMPPacketImpl.h"

#include "Poco/Net/NetException.h"

#include "Poco/Timestamp.h"

#include "Poco/Timespan.h"

#include "Poco/NumberFormatter.h"

#include <sstream>

using Poco::InvalidArgumentException;

using Poco::Timestamp;

using Poco::Timespan;

using Poco::NumberFormatter;

using Poco::UInt8;

using Poco::UInt16;

using Poco::Int32;

namespace Poco {

namespace Net {

const UInt16 ICMPPacketImpl::MAX_PACKET_SIZE = 4096;

const UInt16 ICMPPacketImpl::MAX_SEQ_VALUE = 65535;

ICMPPacketImpl::ICMPPacketImpl(int dataSize):

_seq(0),

_pPacket(new UInt8[MAX_PACKET_SIZE]),

_dataSize(dataSize)

{

if (_dataSize > MAX_PACKET_SIZE)

throw InvalidArgumentException("Packet size must be <= " + NumberFormatter::format(MAX_PACKET_SIZE));

}

ICMPPacketImpl::~ICMPPacketImpl()

{

delete [] _pPacket;

}

void ICMPPacketImpl::setDataSize(int dataSize)

{

_dataSize = dataSize;

initPacket();

}

int ICMPPacketImpl::getDataSize() const

{

return _dataSize;

}

const Poco::UInt8* ICMPPacketImpl::packet(bool init)

{

if (init) initPacket();

return _pPacket;

}

unsigned short ICMPPacketImpl::checksum(UInt16 *addr, Int32 len)

{

Int32 nleft = len;

UInt16* w = addr;

UInt16 answer;

Int32 sum = 0;

while (nleft > 1)

{

sum += *w++;

nleft -= sizeof(UInt16);

}

if (nleft == 1)

{

UInt16 u = 0;

*(UInt8*) (&u) = *(UInt8*) w;

sum += u;

}

sum = (sum >> 16) + (sum & 0xffff);

sum += (sum >> 16);

answer = ~sum;

return answer;

}

} } // namespace Poco::Net