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Copy pathNtpTime.java
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132 lines (117 loc) · 5.42 KB
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import java.net.InetAddress;
import java.net.UnknownHostException;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.List;
import nts.*;
// import org.apache.commons.net.ntp.*;
public class NtpTime {
private static final NumberFormat numberFormat = new java.text.DecimalFormat("0.00");
public static void main(String[] args) throws Exception {
// String TIME_SERVER = "pool.ntp.org";
// String TIME_SERVER = "paris.time.system76.com";
final List<String> TIME_SERVERS =
new ArrayList<>(List.of("paris.time.system76.com", "time.cloudflare.com"));
for (String srv : TIME_SERVERS) {
NTPUDPClient client = new NTPUDPClient();
client.setVersion(4);
InetAddress hostAddr = InetAddress.getByName(srv);
TimeInfo info = client.getTime(hostAddr);
System.out.println(" Server: " + srv);
processResponse(info);
client.close();
}
}
public static void processResponse(final TimeInfo info) {
final NtpV3Packet message = info.getMessage();
final int stratum = message.getStratum();
final String refType;
if (stratum <= 0) {
refType = "(Unspecified or Unavailable)";
} else if (stratum == 1) {
refType = "(Primary Reference; e.g., GPS)"; // GPS, radio clock, etc.
} else {
refType = "(Secondary Reference; e.g. via NTP or SNTP)";
}
// stratum should be 0..15...
System.out.println(" Stratum: " + stratum + " " + refType);
final int version = message.getVersion();
final int li = message.getLeapIndicator();
System.out.println(
" leap=" + li + ", version=" + version + ", precision=" + message.getPrecision());
System.out.println(" mode: " + message.getModeName() + " (" + message.getMode() + ")");
final int poll = message.getPoll();
// poll value typically btwn MINPOLL (4) and MAXPOLL (14)
System.out.println(
" poll: "
+ (poll <= 0 ? 1 : (int) Math.pow(2, poll))
+ " seconds"
+ " (2 ** "
+ poll
+ ")");
final double disp = message.getRootDispersionInMillisDouble();
System.out.println(
" rootdelay="
+ numberFormat.format(message.getRootDelayInMillisDouble())
+ ", rootdispersion(ms): "
+ numberFormat.format(disp));
final int refId = message.getReferenceId();
String refAddr = NtpUtils.getHostAddress(refId);
String refName = null;
if (refId != 0) {
if (refAddr.equals("127.127.1.0")) {
refName = "LOCAL"; // This is the ref address for the Local Clock
} else if (stratum >= 2) {
// If reference id has 127.127 prefix then it uses its own reference clock
// defined in the form 127.127.clock-type.unit-num (e.g. 127.127.8.0 mode 5
// for GENERIC DCF77 AM; see refclock.htm from the NTP software distribution.
if (!refAddr.startsWith("127.127")) {
try {
final InetAddress addr = InetAddress.getByName(refAddr);
final String name = addr.getHostName();
if (name != null && !name.equals(refAddr)) {
refName = name;
}
} catch (final UnknownHostException e) {
// some stratum-2 servers sync to ref clock device but fudge stratum level higher...
// (e.g. 2)
// ref not valid host maybe it's a reference clock name?
// otherwise just show the ref IP address.
refName = NtpUtils.getReferenceClock(message);
}
}
} else if (version >= 3 && (stratum == 0 || stratum == 1)) {
refName = NtpUtils.getReferenceClock(message);
// refname usually have at least 3 characters (e.g. GPS, WWV, LCL, etc.)
}
// otherwise give up on naming the beast...
}
if (refName != null && refName.length() > 1) {
refAddr += " (" + refName + ")";
}
System.out.println(" Reference Identifier:\t" + refAddr);
final TimeStamp refNtpTime = message.getReferenceTimeStamp();
System.out.println(" Reference Timestamp:\t" + refNtpTime + " " + refNtpTime.toDateString());
// Originate Time is time request sent by client (t1)
final TimeStamp origNtpTime = message.getOriginateTimeStamp();
System.out.println(" Originate Timestamp:\t" + origNtpTime + " " + origNtpTime.toDateString());
final long destTimeMillis = info.getReturnTime();
// Receive Time is time request received by server (t2)
final TimeStamp rcvNtpTime = message.getReceiveTimeStamp();
System.out.println(" Receive Timestamp:\t" + rcvNtpTime + " " + rcvNtpTime.toDateString());
// Transmit time is time reply sent by server (t3)
final TimeStamp xmitNtpTime = message.getTransmitTimeStamp();
System.out.println(" Transmit Timestamp:\t" + xmitNtpTime + " " + xmitNtpTime.toDateString());
// Destination time is time reply received by client (t4)
final TimeStamp destNtpTime = TimeStamp.getNtpTime(destTimeMillis);
System.out.println(
" Destination Timestamp:\t" + destNtpTime + " " + destNtpTime.toDateString());
info.computeDetails(); // compute offset/delay if not already done
final Long offsetMillis = info.getOffset();
final Long delayMillis = info.getDelay();
final String delay = delayMillis == null ? "N/A" : delayMillis.toString();
final String offset = offsetMillis == null ? "N/A" : offsetMillis.toString();
System.out.println(
" Roundtrip delay(ms)=" + delay + ", clock offset(ms)=" + offset); // offset in ms
}
}