113 lines
3.8 KiB
C++
113 lines
3.8 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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#include <regex>
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#include <limits>
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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, int utc_offset) {
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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 raw_time = static_cast<std::time_t>(seconds);
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std::tm* utc_time = std::gmtime(&raw_time);
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std::time_t adjusted_time = raw_time + (utc_offset * 3600);
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std::tm* local_time = std::gmtime(&adjusted_time);
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std::cout << "Details of " << server << "\n";
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if (utc_offset == 0) {
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std::cout << "Time: " << std::put_time(utc_time, "%H:%M:%S") << " UTC\n";
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} else {
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std::cout << "Time (utc" << (utc_offset >= 0 ? "+" : "") << utc_offset << "): "
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<< std::put_time(local_time, "%H:%M:%S") << "\n";
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}
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std::cout << "Date: " << std::put_time(local_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 parseUTCOffset(const std::string& timezone) {
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std::regex tz_regex(R"(^utc([+-]?\d+)$)", std::regex::icase);
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std::smatch match;
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if (std::regex_match(timezone, match, tz_regex)) {
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try {
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int offset = std::stoi(match[1]);
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if (offset < -12 || offset > 14) {
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throw std::out_of_range("UTC offset out of range (-12 to +14)");
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}
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return offset;
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} catch (const std::exception&) {
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throw std::invalid_argument("Invalid UTC offset");
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}
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}
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throw std::invalid_argument("Invalid timezone format");
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}
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int main(int argc, char* argv[]) {
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if (argc < 2 || argc > 3) {
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std::cerr << "Usage: " << argv[0] << " [-t=utcX] <NTP server>\n";
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return 1;
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}
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std::string timezone_flag = "-t=utc0";
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std::string server;
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if (argc == 3) {
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timezone_flag = argv[1];
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server = argv[2];
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} else {
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server = argv[1];
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}
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int utc_offset = 0;
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if (timezone_flag.rfind("-t=", 0) == 0 || timezone_flag.rfind("--timezone=", 0) == 0) {
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std::string timezone = timezone_flag.substr(timezone_flag.find('=') + 1);
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try {
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utc_offset = parseUTCOffset(timezone);
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} catch (const std::exception& e) {
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std::cerr << "Error: " << e.what() << "\n";
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return 1;
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}
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}
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queryNTPServer(server, utc_offset);
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return 0;
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}
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