rintyuu/ntpdetails
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rintyuu 2024-11-18 21:24:22 -08:00
parent 7fe8e30c89
commit bbeab27f2e
1 changed files with 2 additions and 15 deletions
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17
ntpdetails.cpp
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@ -13,35 +13,27 @@ void queryNTPServer(const std::string& server, int utc_offset) {
try {
asio::io_context io_context;
// Resolve the server using IPv4
asio::ip::udp::resolver resolver(io_context);
asio::ip::udp::resolver::query query(asio::ip::udp::v4(), server, std::to_string(NTP_PORT));
asio::ip::udp::endpoint endpoint = *resolver.resolve(query).begin();
// Create a socket
asio::ip::udp::socket socket(io_context);
socket.open(asio::ip::udp::v4());
// Create NTP request packet
std::array<unsigned char, NTP_PACKET_SIZE> request{};
request[0] = 0b11100011; // LI, Version, Mode: (3-3-3 for client mode)
request[0] = 0b11100011;
// Record start time for ping calculation
auto start_time = std::chrono::high_resolution_clock::now();
// Send the request
socket.send_to(asio::buffer(request), endpoint);
// Receive response
std::array<unsigned char, NTP_PACKET_SIZE> response{};
asio::ip::udp::endpoint sender_endpoint;
socket.receive_from(asio::buffer(response), sender_endpoint);
// Record end time for ping calculation
auto end_time = std::chrono::high_resolution_clock::now();
std::chrono::duration<double> ping = end_time - start_time;
// Extract the timestamp
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) |
@ -49,22 +41,17 @@ void queryNTPServer(const std::string& server, int utc_offset) {
(static_cast<unsigned long long>(response[43]));
seconds -= NTP_TIMESTAMP_DELTA;
// Convert timestamp to human-readable format
std::time_t raw_time = static_cast<std::time_t>(seconds);
std::tm* utc_time = std::gmtime(&raw_time);
// Calculate adjusted time for the UTC offset
std::time_t adjusted_time = raw_time + (utc_offset * 3600);
std::tm* local_time = std::gmtime(&adjusted_time);
// Print details
std::cout << "Details of " << server << "\n";
if (utc_offset == 0) {
// Print UTC time if no timezone is provided
std::cout << "Time: " << std::put_time(utc_time, "%H:%M:%S") << " UTC\n";
} else {
// Print adjusted time for the provided UTC offset
std::cout << "Time (utc" << (utc_offset >= 0 ? "+" : "") << utc_offset << "): "
<< std::put_time(local_time, "%H:%M:%S") << "\n";
}
@ -83,7 +70,7 @@ int parseUTCOffset(const std::string& timezone) {
if (std::regex_match(timezone, match, tz_regex)) {
try {
int offset = std::stoi(match[1]);
if (offset < -12 || offset > 14) { // Limit UTC offsets to reasonable values
if (offset < -12 || offset > 14) {
throw std::out_of_range("UTC offset out of range (-12 to +14)");
}
return offset;