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* NTP client implementation
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170
Net/src/NTPPacket.cpp
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170
Net/src/NTPPacket.cpp
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//
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// NTPPacket.cpp
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//
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// $Id: //poco/1.4/Net/src/NTPPacket.cpp#2 $
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//
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// Library: Net
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// Package: NTP
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// Module: NTPPacket
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//
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// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#include "Poco/Net/NTPPacket.h"
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#include "Poco/Net/NetException.h"
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#include "Poco/Timestamp.h"
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#include "Poco/ByteOrder.h"
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namespace Poco {
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namespace Net {
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#pragma pack(push,1)
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typedef struct _NTPPacketData {
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Poco::Int8 mode:3;
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Poco::Int8 vn:3;
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Poco::Int8 li:2;
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Poco::Int8 stratum;
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Poco::Int8 pool;
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Poco::Int8 prec;
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Poco::Int32 rootdelay;
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Poco::Int32 rootdisp;
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Poco::Int32 refid;
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Poco::Int64 rts;
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Poco::Int64 ots;
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Poco::Int64 vts;
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Poco::Int64 tts;
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} NTPPacketData;
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#pragma pack(pop)
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NTPPacket::NTPPacket() :
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// the next 3 fields must be in reverse order from spec
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_leapIndicator(3),
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_version(4),
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_mode(3),
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_stratum(0),
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_pool(6),
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_precision(-18),
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_rootDelay(0),
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_rootDispersion(0),
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_referenceId(0),
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_referenceTimestamp(0),
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_receiveTimestamp(0),
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_transmitTimestamp(0)
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{
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Poco::Timestamp ts;
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_originateTimestamp = ts.utcTime();
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}
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NTPPacket::NTPPacket(Poco::UInt8 *packet)
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{
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setPacket(packet);
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}
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NTPPacket::~NTPPacket()
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{
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}
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void NTPPacket::packet(Poco::UInt8 *packet) const
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{
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NTPPacketData *p = (NTPPacketData*)packet;
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p->li = _leapIndicator;
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p->vn = _version;
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p->mode = _mode;
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p->stratum = _stratum;
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p->pool = _pool;
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p->prec = _precision;
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p->rootdelay = Poco::ByteOrder::toNetwork(_rootDelay);
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p->rootdisp = Poco::ByteOrder::toNetwork(_rootDispersion);
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p->refid = Poco::ByteOrder::toNetwork(_referenceId);
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p->rts = Poco::ByteOrder::toNetwork(_referenceTimestamp);
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p->ots = Poco::ByteOrder::toNetwork(_originateTimestamp);
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p->vts = Poco::ByteOrder::toNetwork(_receiveTimestamp);
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p->tts = Poco::ByteOrder::toNetwork(_transmitTimestamp);
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}
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void NTPPacket::setPacket(Poco::UInt8 *packet)
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{
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NTPPacketData *p = (NTPPacketData*)packet;
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_leapIndicator = p->li;
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_version = p->vn;
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_mode = p->mode;
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_stratum = p->stratum;
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_pool = p->pool;
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_precision = p->prec;
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_rootDelay = Poco::ByteOrder::fromNetwork(p->rootdelay);
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_rootDispersion = Poco::ByteOrder::fromNetwork(p->rootdisp);
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_referenceId = Poco::ByteOrder::fromNetwork(p->refid);
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_referenceTimestamp = Poco::ByteOrder::fromNetwork(p->rts);
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_originateTimestamp = Poco::ByteOrder::fromNetwork(p->ots);
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_receiveTimestamp = Poco::ByteOrder::fromNetwork(p->vts);
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_transmitTimestamp = Poco::ByteOrder::fromNetwork(p->tts);
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}
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Poco::Timestamp NTPPacket::referenceTime() const
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{
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return convertTime(_referenceTimestamp);
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}
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Poco::Timestamp NTPPacket::originateTime() const
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{
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return convertTime(_originateTimestamp);
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}
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Poco::Timestamp NTPPacket::receiveTime() const
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{
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return convertTime(_receiveTimestamp);
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}
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Poco::Timestamp NTPPacket::transmitTime() const
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{
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return convertTime(_transmitTimestamp);
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}
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Poco::Timestamp NTPPacket::convertTime(Poco::Int64 tm) const
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{
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const unsigned long seventyYears = 2208988800UL;
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Poco::UInt32 secsSince1900 = UInt32(Poco::ByteOrder::toLittleEndian(tm) >> 32);
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unsigned long epoch = secsSince1900 - seventyYears;
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return Poco::Timestamp::fromEpochTime(epoch);
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}
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} } // namespace Poco::Net
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