commons-net.jar Source Code

commons-net.jar is the bytecode of Apache Commons Net library, which implements the client side of many basic Internet protocols.

Apache Commons Net Source Code files are provided in the binary packge (commons-net-3.8.0-bin.zip). You can download it at Apache Commons Net Website.

The source code of commons-net-3.8.0.jar is provided below:

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org/apache/commons/net/ntp/NtpUtils.java

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(final 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(final NtpV3Packet packet)
     {
         final 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(final NtpV3Packet message) {
        if (message == null) {
            return "";
        }
        final int refId = message.getReferenceId();
        if (refId == 0) {
            return "";
        }
        final StringBuilder buf = new StringBuilder(4);
        // start at highest-order byte (0x4c434c00 -> LCL)
        for (int shiftBits = 24; shiftBits >= 0; shiftBits -= 8)
        {
            final 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(final 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";
        }
    }

}

org/apache/commons/net/ntp/NtpUtils.java

 

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File name: commons-net-3.8.0-sources.jar
File size: 437325 bytes
Release date: 2020-01-22
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