| package 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. |
| * |
| */ |
| 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 the message to check |
| * @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) { // 0-terminated ASCII string |
| break; |
| } |
| if (!Character.isLetterOrDigit(c)) { |
| return ""; |
| } |
| buf.append(c); |
| } |
| return buf.toString(); |
| } |
| |
| /*** |
| * Return human-readable name of message mode type (RFC 1305). |
| * |
| * @param mode the mode type |
| * @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"; |
| } |
| } |
| |
| } |