List of usage examples for org.apache.commons.net.ntp NtpV3Packet setOriginateTimeStamp
public void setOriginateTimeStamp(TimeStamp ts);
From source file:examples.ntp.SimpleNTPServer.java
/** * Handle incoming packet. If NTP packet is client-mode then respond * to that host with a NTP response packet otherwise ignore. * * @param request incoming DatagramPacket * @param rcvTime time packet received// ww w . ja v a 2s. c o m * * @throws IOException if an I/O error occurs. */ protected void handlePacket(DatagramPacket request, long rcvTime) throws IOException { NtpV3Packet message = new NtpV3Impl(); message.setDatagramPacket(request); System.out.printf("NTP packet from %s mode=%s%n", request.getAddress().getHostAddress(), NtpUtils.getModeName(message.getMode())); if (message.getMode() == NtpV3Packet.MODE_CLIENT) { NtpV3Packet response = new NtpV3Impl(); response.setStratum(1); response.setMode(NtpV3Packet.MODE_SERVER); response.setVersion(NtpV3Packet.VERSION_3); response.setPrecision(-20); response.setPoll(0); response.setRootDelay(62); response.setRootDispersion((int) (16.51 * 65.536)); // originate time as defined in RFC-1305 (t1) response.setOriginateTimeStamp(message.getTransmitTimeStamp()); // Receive Time is time request received by server (t2) response.setReceiveTimeStamp(TimeStamp.getNtpTime(rcvTime)); response.setReferenceTime(response.getReceiveTimeStamp()); response.setReferenceId(0x4C434C00); // LCL (Undisciplined Local Clock) // Transmit time is time reply sent by server (t3) response.setTransmitTime(TimeStamp.getNtpTime(System.currentTimeMillis())); DatagramPacket dp = response.getDatagramPacket(); dp.setPort(request.getPort()); dp.setAddress(request.getAddress()); socket.send(dp); } // otherwise if received packet is other than CLIENT mode then ignore it }