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//
// NTPPacket.cpp
//
// Library: Net
// Package: NTP
// Module: NTPPacket
//
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/Net/NTPPacket.h"
#include "Poco/Net/NetException.h"
#include "Poco/Timestamp.h"
#include "Poco/ByteOrder.h"
namespace Poco {
namespace Net {
#if !defined(POCO_COMPILER_SUN)
#pragma pack(push, 1)
#else
#pragma pack(1)
#endif
struct NTPPacketData
{
Poco::Int8 mode:3;
Poco::Int8 vn:3;
Poco::Int8 li:2;
Poco::Int8 stratum;
Poco::Int8 pool;
Poco::Int8 prec;
Poco::Int32 rootdelay;
Poco::Int32 rootdisp;
Poco::Int32 refid;
Poco::Int64 rts;
Poco::Int64 ots;
Poco::Int64 vts;
Poco::Int64 tts;
};
#if !defined(POCO_COMPILER_SUN)
#pragma pack(pop)
#else
#pragma pack()
#endif
NTPPacket::NTPPacket() :
// the next 3 fields must be in reverse order from spec
_leapIndicator(3),
_version(4),
_mode(3),
_stratum(0),
_pool(6),
_precision(-18),
_rootDelay(0),
_rootDispersion(0),
_referenceId(0),
_referenceTimestamp(0),
_receiveTimestamp(0),
_transmitTimestamp(0)
{
Poco::Timestamp ts;
_originateTimestamp = ts.utcTime() - 2874597888;
}
NTPPacket::NTPPacket(Poco::UInt8 *packet)
{
setPacket(packet);
}
NTPPacket::~NTPPacket()
{
}
void NTPPacket::packet(Poco::UInt8 *packet) const
{
NTPPacketData *p = (NTPPacketData*)packet;
p->li = _leapIndicator;
p->vn = _version;
p->mode = _mode;
p->stratum = _stratum;
p->pool = _pool;
p->prec = _precision;
p->rootdelay = Poco::ByteOrder::toNetwork(_rootDelay);
p->rootdisp = Poco::ByteOrder::toNetwork(_rootDispersion);
p->refid = Poco::ByteOrder::toNetwork(_referenceId);
p->rts = Poco::ByteOrder::toNetwork(_referenceTimestamp);
p->ots = Poco::ByteOrder::toNetwork(_originateTimestamp);
p->vts = Poco::ByteOrder::toNetwork(_receiveTimestamp);
p->tts = Poco::ByteOrder::toNetwork(_transmitTimestamp);
}
void NTPPacket::setPacket(Poco::UInt8 *packet)
{
NTPPacketData *p = (NTPPacketData*)packet;
_leapIndicator = p->li;
_version = p->vn;
_mode = p->mode;
_stratum = p->stratum;
_pool = p->pool;
_precision = p->prec;
_rootDelay = Poco::ByteOrder::fromNetwork(p->rootdelay);
_rootDispersion = Poco::ByteOrder::fromNetwork(p->rootdisp);
_referenceId = Poco::ByteOrder::fromNetwork(p->refid);
_referenceTimestamp = Poco::ByteOrder::fromNetwork(p->rts);
_originateTimestamp = Poco::ByteOrder::fromNetwork(p->ots);
_receiveTimestamp = Poco::ByteOrder::fromNetwork(p->vts);
_transmitTimestamp = Poco::ByteOrder::fromNetwork(p->tts);
}
Poco::Timestamp NTPPacket::referenceTime() const
{
return convertTime(_referenceTimestamp);
}
Poco::Timestamp NTPPacket::originateTime() const
{
return convertTime(_originateTimestamp);
}
Poco::Timestamp NTPPacket::receiveTime() const
{
return convertTime(_receiveTimestamp);
}
Poco::Timestamp NTPPacket::transmitTime() const
{
return convertTime(_transmitTimestamp);
}
Poco::Timestamp NTPPacket::convertTime(Poco::Int64 tm) const
{
const unsigned long seventyYears = 2208988800UL;
Poco::UInt32 secsSince1900 = UInt32(Poco::ByteOrder::toLittleEndian(tm) >> 32);
unsigned long epoch = secsSince1900 - seventyYears;
return Poco::Timestamp::fromEpochTime(epoch);
}
} } // namespace Poco::Net
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