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org.apache.commons.net.ntp.NtpUtils |
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1 | package org.apache.commons.net.ntp; |
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2 | /* |
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3 | * Copyright 2001-2005 The Apache Software Foundation |
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4 | * |
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5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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6 | * you may not use this file except in compliance with the License. |
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7 | * You may obtain a copy of the License at |
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8 | * |
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9 | * http://www.apache.org/licenses/LICENSE-2.0 |
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10 | * |
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11 | * Unless required by applicable law or agreed to in writing, software |
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12 | * distributed under the License is distributed on an "AS IS" BASIS, |
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13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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14 | * See the License for the specific language governing permissions and |
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15 | * limitations under the License. |
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16 | */ |
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17 | ||
18 | /*** |
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19 | * Common NtpUtils Helper class. |
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20 | * |
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21 | * @author Jason Mathews, MITRE Corp |
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22 | * |
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23 | * @version $Revision: 165675 $ $Date: 2005-05-02 15:09:55 -0500 (Mon, 02 May 2005) $ |
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24 | */ |
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25 | 0 | public final class NtpUtils { |
26 | ||
27 | /*** |
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28 | * Returns 32-bit integer address to IPv4 address string "%d.%d.%d.%d" format. |
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29 | * |
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30 | * @param address the 32-bit address |
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31 | * @return the raw IP address in a string format. |
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32 | */ |
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33 | public static String getHostAddress(int address) |
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34 | { |
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35 | 0 | return ((address >>> 24) & 0xFF) + "." + |
36 | ((address >>> 16) & 0xFF) + "." + |
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37 | ((address >>> 8) & 0xFF) + "." + |
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38 | ((address >>> 0) & 0xFF); |
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39 | } |
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40 | ||
41 | /*** |
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42 | * Returns NTP packet reference identifier as IP address. |
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43 | * |
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44 | * @param packet NTP packet |
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45 | * @return the packet reference id (as IP address) in "%d.%d.%d.%d" format. |
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46 | */ |
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47 | public static String getRefAddress(NtpV3Packet packet) |
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48 | { |
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49 | 0 | int address = (packet == null) ? 0 : packet.getReferenceId(); |
50 | 0 | return getHostAddress(address); |
51 | } |
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52 | ||
53 | /*** |
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54 | * Get refId as reference clock string (e.g. GPS, WWV, LCL). If string is |
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55 | * invalid (non-ASCII character) then returns empty string "". |
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56 | * For details refer to the <A HREF="http://www.eecis.udel.edu/~mills/ntp/html/refclock.html#list">Comprehensive |
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57 | * List of Clock Drivers</A>. |
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58 | * |
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59 | * @param message |
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60 | * @return reference clock string if primary NTP server |
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61 | */ |
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62 | public static String getReferenceClock(NtpV3Packet message) { |
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63 | 0 | if (message == null) |
64 | 0 | return ""; |
65 | 0 | int refId = message.getReferenceId(); |
66 | 0 | if (refId == 0) |
67 | 0 | return ""; |
68 | 0 | StringBuffer buf = new StringBuffer(4); |
69 | // start at highest-order byte (0x4c434c00 -> LCL) |
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70 | 0 | for (int shiftBits = 24; shiftBits >= 0; shiftBits -= 8) |
71 | { |
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72 | 0 | char c = (class="keyword">char) ((refId >>> shiftBits) & 0xff); |
73 | 0 | if (c == 0) break; // 0-terminated ASCII string |
74 | 0 | if (!Character.isLetterOrDigit(c)) |
75 | 0 | return ""; |
76 | 0 | buf.append(c); |
77 | } |
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78 | 0 | return buf.toString(); |
79 | } |
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80 | ||
81 | /*** |
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82 | * Return human-readable name of message mode type (RFC 1305). |
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83 | * |
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84 | * @param mode |
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85 | * @return mode name |
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86 | */ |
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87 | public static String getModeName(int mode) |
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88 | { |
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89 | 0 | switch (mode) { |
90 | case NtpV3Packet.MODE_RESERVED: |
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91 | 0 | return "Reserved"; |
92 | case NtpV3Packet.MODE_SYMMETRIC_ACTIVE: |
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93 | 0 | return "Symmetric Active"; |
94 | case NtpV3Packet.MODE_SYMMETRIC_PASSIVE: |
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95 | 0 | return "Symmetric Passive"; |
96 | case NtpV3Packet.MODE_CLIENT: |
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97 | 0 | return "Client"; |
98 | case NtpV3Packet.MODE_SERVER: |
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99 | 0 | return "Server"; |
100 | case NtpV3Packet.MODE_BROADCAST: |
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101 | 0 | return "Broadcast"; |
102 | case NtpV3Packet.MODE_CONTROL_MESSAGE: |
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103 | 0 | return "Control"; |
104 | case NtpV3Packet.MODE_PRIVATE: |
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105 | 0 | return "Private"; |
106 | default: |
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107 | 0 | return "Unknown"; |
108 | } |
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109 | } |
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110 | ||
111 | } |
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