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61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
#include <inttypes.h>
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#include <string.h>
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#include <boost/asio.hpp>
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#include "Log.h"
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#include "I2PEndian.h"
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#include "Timestamp.h"
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namespace i2p
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{
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namespace util
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{
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static int64_t g_TimeOffset = 0; // in seconds
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void SyncTimeWithNTP (const std::string& address)
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{
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boost::asio::io_service service;
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boost::asio::ip::udp::resolver::query query (boost::asio::ip::udp::v4 (), address, "ntp");
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boost::system::error_code ec;
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auto it = boost::asio::ip::udp::resolver (service).resolve (query, ec);
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if (!ec && it != boost::asio::ip::udp::resolver::iterator())
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{
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auto ep = (*it).endpoint (); // take first one
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boost::asio::ip::udp::socket socket (service);
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socket.open (boost::asio::ip::udp::v4 (), ec);
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if (!ec)
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{
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uint8_t buf[48];// 48 bytes NTP request/response
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memset (buf, 0, 48);
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htobe32buf (buf, (3 << 27) | (3 << 24)); // RFC 4330
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size_t len = 0;
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try
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{
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socket.send_to (boost::asio::buffer (buf, 48), ep);
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int i = 0;
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while (!socket.available() && i < 10) // 10 seconds max
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{
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std::this_thread::sleep_for (std::chrono::seconds(1));
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i++;
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}
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if (socket.available ())
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len = socket.receive_from (boost::asio::buffer (buf, 48), ep);
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}
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catch (std::exception& e)
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{
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LogPrint (eLogError, "NTP error: ", e.what ());
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}
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if (len >= 8)
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{
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auto ourTs = GetSecondsSinceEpoch ();
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uint32_t ts = bufbe32toh (buf + 32);
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if (ts > 2208988800U) ts -= 2208988800U; // 1/1/1970 from 1/1/1900
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g_TimeOffset = ts - ourTs;
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LogPrint (eLogInfo, address, " time offset from system time is ", g_TimeOffset, " seconds");
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}
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}
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}
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}
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}
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}
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