rintyuu
f563932981
in some network configs, ipv6 isnt configured properly, but ipv4 is. forced usage of ipv4 instead of ipv6
64 lines
No EOL
2.3 KiB
C++
64 lines
No EOL
2.3 KiB
C++
#include <iostream>
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#include <iomanip>
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#include <chrono>
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#include <cstring>
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#include <asio.hpp>
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const int NTP_PORT = 123;
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const int NTP_PACKET_SIZE = 48;
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void queryNTPServer(const std::string& server) {
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try {
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asio::io_context io_context;
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asio::ip::udp::resolver resolver(io_context);
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asio::ip::udp::resolver::query query(asio::ip::udp::v4(), server, std::to_string(NTP_PORT));
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asio::ip::udp::endpoint endpoint = *resolver.resolve(query).begin();
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asio::ip::udp::socket socket(io_context);
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socket.open(asio::ip::udp::v4());
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std::array<unsigned char, NTP_PACKET_SIZE> request{};
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request[0] = 0b11100011;
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auto start_time = std::chrono::high_resolution_clock::now();
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socket.send_to(asio::buffer(request), endpoint);
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std::array<unsigned char, NTP_PACKET_SIZE> response{};
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asio::ip::udp::endpoint sender_endpoint;
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socket.receive_from(asio::buffer(response), sender_endpoint);
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auto end_time = std::chrono::high_resolution_clock::now();
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std::chrono::duration<double> ping = end_time - start_time;
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const unsigned long long NTP_TIMESTAMP_DELTA = 2208988800ULL;
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unsigned long long seconds = (static_cast<unsigned long long>(response[40]) << 24) |
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(static_cast<unsigned long long>(response[41]) << 16) |
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(static_cast<unsigned long long>(response[42]) << 8) |
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static_cast<unsigned long long>(response[43]);
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seconds -= NTP_TIMESTAMP_DELTA;
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std::time_t time = static_cast<std::time_t>(seconds);
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std::tm* utc_time = std::gmtime(&time);
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std::cout << "Details of " << server << "\n";
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std::cout << "Time: " << std::put_time(utc_time, "%H:%M:%S") << " UTC\n";
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std::cout << "Date: " << std::put_time(utc_time, "%Y-%m-%d") << "\n";
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std::cout << "Ping: " << std::fixed << std::setprecision(3) << ping.count() * 1000 << " ms\n";
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} catch (const std::exception& e) {
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std::cerr << "Error: " << e.what() << "\n";
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}
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}
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int main(int argc, char* argv[]) {
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if (argc != 2) {
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std::cerr << "Usage: " << argv[0] << " <NTP server>\n";
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return 1;
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}
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std::string server = argv[1];
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queryNTPServer(server);
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return 0;
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} |