mirror of https://github.com/PurpleI2P/i2pd.git
I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
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50 lines
1.3 KiB
50 lines
1.3 KiB
#include <inttypes.h> |
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#include <string.h> |
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#include <boost/asio.hpp> |
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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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std::chrono::system_clock::duration g_TimeOffset = std::chrono::system_clock::duration::zero (); |
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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 request[48];// 48 bytes NTP request |
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memset (request, 0, 48); |
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request[0] = 0x80; // client mode, version 0 |
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uint8_t * response = new uint8_t[1500]; // MTU |
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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 (request, 48), ep); |
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len = socket.receive_from (boost::asio::buffer (response, 1500), ep); |
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} |
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catch (std::exception& e) |
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{ |
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} |
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if (len >= 8) |
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{ |
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uint32_t ts = bufbe32toh (response + 4); |
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if (ts > 2208988800U) ts -= 2208988800U; // 1/1/1970 from 1/1/1900 |
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} |
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delete[] response; |
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} |
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} |
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} |
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} |
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} |
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