Add ntpdetails.cpp

ntpdetails.cpp

@@ -0,0 +1,63 @@
+#include <iostream>
+#include <iomanip>
+#include <chrono>
+#include <cstring>
+#include <asio.hpp>
+
+const int NTP_PORT = 123;
+const int NTP_PACKET_SIZE = 48;
+
+void queryNTPServer(const std::string& server) {
+    try {
+        asio::io_context io_context;
+
+        asio::ip::udp::resolver resolver(io_context);
+        asio::ip::udp::endpoint endpoint = *resolver.resolve(server, std::to_string(NTP_PORT)).begin();
+
+        asio::ip::udp::socket socket(io_context);
+        socket.open(asio::ip::udp::v4());
+
+        std::array<unsigned char, NTP_PACKET_SIZE> request{};
+        request[0] = 0b11100011; 
+
+        auto start_time = std::chrono::high_resolution_clock::now();
+
+        socket.send_to(asio::buffer(request), endpoint);
+
+        std::array<unsigned char, NTP_PACKET_SIZE> response{};
+        asio::ip::udp::endpoint sender_endpoint;
+        socket.receive_from(asio::buffer(response), sender_endpoint);
+
+        auto end_time = std::chrono::high_resolution_clock::now();
+        std::chrono::duration<double> ping = end_time - start_time;
+
+        const unsigned long long NTP_TIMESTAMP_DELTA = 2208988800ULL;
+        unsigned long long seconds = (static_cast<unsigned long long>(response[40]) << 24) |
+                                     (static_cast<unsigned long long>(response[41]) << 16) |
+                                     (static_cast<unsigned long long>(response[42]) << 8) |
+                                     static_cast<unsigned long long>(response[43]);
+        seconds -= NTP_TIMESTAMP_DELTA;
+
+        std::time_t time = static_cast<std::time_t>(seconds);
+        std::tm* utc_time = std::gmtime(&time);
+
+        std::cout << "Details of " << server << "\n";
+        std::cout << "Time: " << std::put_time(utc_time, "%H:%M:%S") << " UTC\n";
+        std::cout << "Date: " << std::put_time(utc_time, "%Y-%m-%d") << "\n";
+        std::cout << "Ping: " << std::fixed << std::setprecision(3) << ping.count() * 1000 << " ms\n";
+
+    } catch (const std::exception& e) {
+        std::cerr << "Error: " << e.what() << "\n";
+    }
+}
+
+int main(int argc, char* argv[]) {
+    if (argc != 2) {
+        std::cerr << "Usage: " << argv[0] << " <NTP server>\n";
+        return 1;
+    }
+
+    std::string server = argv[1];
+    queryNTPServer(server);
+    return 0;
+}