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2006-07-29 Complication

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* Treat NTP responses from unexpected stratums like failures
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complication
2006-07-30 05:08:20 +00:00
committed by zzz
parent 1e9e7dd345
commit 3c09ca3359
3 changed files with 14 additions and 3 deletions
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8
core/java/src/net/i2p/time/NtpClient.java
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@@ -112,11 +112,19 @@ public class NtpClient {
// Process response
NtpMessage msg = new NtpMessage(packet.getData());
double roundTripDelay = (destinationTimestamp-msg.originateTimestamp) -
(msg.receiveTimestamp-msg.transmitTimestamp);
double localClockOffset = ((msg.receiveTimestamp - msg.originateTimestamp) +
(msg.transmitTimestamp - destinationTimestamp)) / 2;
socket.close();
// Stratum must be between 1 (atomic) and 15 (maximum defined value)
// Anything else is right out, treat such responses like errors
if ((msg.stratum < 1) || (msg.stratum > 15)) {
//System.out.println("Response from NTP server of unacceptable stratum " + msg.stratum + ", failing.");
return(-1);
}
long rv = (long)(System.currentTimeMillis() + localClockOffset*1000);
//System.out.println("host: " + address.getHostAddress() + " rtt: " + roundTripDelay + " offset: " + localClockOffset + " seconds");