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ICMPSocketImpl.cpp
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120 lines (100 loc) · 3.36 KB
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//
// ICMPSocketImpl.cpp
//
// $Id: //poco/1.4/Net/src/ICMPSocketImpl.cpp#1 $
//
// Library: Net
// Package: ICMP
// Module: ICMPSocketImpl
//
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#include "Poco/Net/ICMPSocketImpl.h"
#include "Poco/Net/NetException.h"
#include "Poco/Timespan.h"
#include "Poco/Timestamp.h"
#include "Poco/Exception.h"
using Poco::TimeoutException;
using Poco::Timespan;
using Poco::Exception;
namespace Poco {
namespace Net {
ICMPSocketImpl::ICMPSocketImpl(IPAddress::Family family, int dataSize, int ttl, int timeout):
RawSocketImpl(family, IPPROTO_ICMP),
_icmpPacket(family, dataSize),
_timeout(timeout)
{
setOption(IPPROTO_IP, IP_TTL, ttl);
setReceiveTimeout(Timespan(timeout));
}
ICMPSocketImpl::~ICMPSocketImpl()
{
}
int ICMPSocketImpl::sendTo(const void*, int, const SocketAddress& address, int flags)
{
int n = SocketImpl::sendTo(_icmpPacket.packet(), _icmpPacket.packetSize(), address, flags);
return n;
}
int ICMPSocketImpl::receiveFrom(void*, int, SocketAddress& address, int flags)
{
int maxPacketSize = _icmpPacket.maxPacketSize();
unsigned char* buffer = new unsigned char[maxPacketSize];
try
{
Poco::Timestamp ts;
do
{
if (ts.isElapsed(_timeout))
{
// This guards against a possible DoS attack, where sending
// fake ping responses will cause an endless loop.
throw TimeoutException();
}
SocketImpl::receiveFrom(buffer, maxPacketSize, address, flags);
}
while (!_icmpPacket.validReplyID(buffer, maxPacketSize));
}
catch (TimeoutException&)
{
delete [] buffer;
throw;
}
catch (Exception&)
{
std::string err = _icmpPacket.errorDescription(buffer, maxPacketSize);
delete [] buffer;
if (!err.empty())
throw ICMPException(err);
else
throw;
}
struct timeval then = _icmpPacket.time(buffer, maxPacketSize);
struct timeval now = _icmpPacket.time();
int elapsed = (((now.tv_sec * 1000000) + now.tv_usec) - ((then.tv_sec * 1000000) + then.tv_usec))/1000;
delete[] buffer;
return elapsed;
}
} } // namespace Poco::Net