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Commons Net example source code file (NtpUtils.java)
The Commons Net NtpUtils.java source codepackage org.apache.commons.net.ntp; /* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /*** * Common NtpUtils Helper class. * * @author Jason Mathews, MITRE Corp * * @version $Revision: 929344 $ $Date: 2010-03-31 01:20:49 +0100 (Wed, 31 Mar 2010) $ */ public final class NtpUtils { /*** * Returns 32-bit integer address to IPv4 address string "%d.%d.%d.%d" format. * * @param address the 32-bit address * @return the raw IP address in a string format. */ public static String getHostAddress(int address) { return ((address >>> 24) & 0xFF) + "." + ((address >>> 16) & 0xFF) + "." + ((address >>> 8) & 0xFF) + "." + ((address >>> 0) & 0xFF); } /*** * Returns NTP packet reference identifier as IP address. * * @param packet NTP packet * @return the packet reference id (as IP address) in "%d.%d.%d.%d" format. */ public static String getRefAddress(NtpV3Packet packet) { int address = (packet == null) ? 0 : packet.getReferenceId(); return getHostAddress(address); } /*** * Get refId as reference clock string (e.g. GPS, WWV, LCL). If string is * invalid (non-ASCII character) then returns empty string "". * For details refer to the <A HREF="http://www.eecis.udel.edu/~mills/ntp/html/refclock.html#list">Comprehensive * List of Clock Drivers</A>. * * @param message * @return reference clock string if primary NTP server */ public static String getReferenceClock(NtpV3Packet message) { if (message == null) return ""; int refId = message.getReferenceId(); if (refId == 0) return ""; StringBuilder buf = new StringBuilder(4); // start at highest-order byte (0x4c434c00 -> LCL) for (int shiftBits = 24; shiftBits >= 0; shiftBits -= 8) { char c = (char) ((refId >>> shiftBits) & 0xff); if (c == 0) break; // 0-terminated ASCII string if (!Character.isLetterOrDigit(c)) return ""; buf.append(c); } return buf.toString(); } /*** * Return human-readable name of message mode type (RFC 1305). * * @param mode * @return mode name */ public static String getModeName(int mode) { switch (mode) { case NtpV3Packet.MODE_RESERVED: return "Reserved"; case NtpV3Packet.MODE_SYMMETRIC_ACTIVE: return "Symmetric Active"; case NtpV3Packet.MODE_SYMMETRIC_PASSIVE: return "Symmetric Passive"; case NtpV3Packet.MODE_CLIENT: return "Client"; case NtpV3Packet.MODE_SERVER: return "Server"; case NtpV3Packet.MODE_BROADCAST: return "Broadcast"; case NtpV3Packet.MODE_CONTROL_MESSAGE: return "Control"; case NtpV3Packet.MODE_PRIVATE: return "Private"; default: return "Unknown"; } } } Other Commons Net examples (source code examples)Here is a short list of links related to this Commons Net NtpUtils.java source code file: |
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