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correct NTP request

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orignal 2016-11-01 16:27:44 -04:00
parent 4582a4fd95
commit 44af5e04e4
2 changed files with 11 additions and 10 deletions
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19
Timestamp.cpp
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@ -1,6 +1,7 @@
#include <inttypes.h>
#include <string.h>
#include <boost/asio.hpp>
#include "Log.h"
#include "I2PEndian.h"
#include "Timestamp.h"
@ -8,7 +9,7 @@ namespace i2p
{
namespace util
{
std::chrono::system_clock::duration g_TimeOffset = std::chrono::system_clock::duration::zero ();
std::chrono::seconds g_TimeOffset (0);
void SyncTimeWithNTP (const std::string& address)
{
@ -23,25 +24,25 @@ namespace util
socket.open (boost::asio::ip::udp::v4 (), ec);
if (!ec)
{
uint8_t request[48];// 48 bytes NTP request
memset (request, 0, 48);
request[0] = 0x80; // client mode, version 0
uint8_t * response = new uint8_t[1500]; // MTU
uint8_t buf[48];// 48 bytes NTP request/response
memset (buf, 0, 48);
htobe32buf (buf, (3 << 27) | (3 << 24)); // RFC 4330
size_t len = 0;
try
{
socket.send_to (boost::asio::buffer (request, 48), ep);
len = socket.receive_from (boost::asio::buffer (response, 1500), ep);
socket.send_to (boost::asio::buffer (buf, 48), ep);
len = socket.receive_from (boost::asio::buffer (buf, 48), ep);
}
catch (std::exception& e)
{
}
if (len >= 8)
{
uint32_t ts = bufbe32toh (response + 4);
uint32_t ts = bufbe32toh (buf + 32);
if (ts > 2208988800U) ts -= 2208988800U; // 1/1/1970 from 1/1/1900
g_TimeOffset = std::chrono::seconds(ts) - std::chrono::duration_cast<std::chrono::seconds>(std::chrono::system_clock::now().time_since_epoch());
LogPrint (eLogInfo, address, " time offset from system time is ", g_TimeOffset.count (), " seconds");
}
delete[] response;
}
}
}

2
Timestamp.h
View File

@ -8,7 +8,7 @@ namespace i2p
{
namespace util
{
extern std::chrono::system_clock::duration g_TimeOffset;
extern std::chrono::seconds g_TimeOffset;
inline uint64_t GetMillisecondsSinceEpoch ()
{