Basic upload functionality to predifined location, with basic file browser

1 files changed, 140 insertions, 0 deletions

diff --git a/org/apache/commons/net/ntp/NTPUDPClient.java b/org/apache/commons/net/ntp/NTPUDPClient.java
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+++ b/org/apache/commons/net/ntp/NTPUDPClient.java
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+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.

+ */

+

+

+import java.io.IOException;

+import java.net.DatagramPacket;

+import java.net.InetAddress;

+

+import org.apache.commons.net.DatagramSocketClient;

+

+/***

+ * The NTPUDPClient class is a UDP implementation of a client for the

+ * Network Time Protocol (NTP) described in RFC 1305 as well as the

+ * Simple Network Time Protocol (SNTP) in RFC-2030. To use the class,

+ * merely open a local datagram socket with <a href="#open"> open </a>

+ * and call <a href="#getTime"> getTime </a> to retrieve the time. Then call

+ * <a href="org.apache.commons.net.DatagramSocketClient.html#close"> close </a>

+ * to close the connection properly.

+ * Successive calls to <a href="#getTime"> getTime </a> are permitted

+ * without re-establishing a connection.  That is because UDP is a

+ * connectionless protocol and the Network Time Protocol is stateless.

+ *

+ * @author Jason Mathews, MITRE Corp

+ * @version $Revision: 489397 $ $Date: 2006-12-21 16:28:51 +0000 (Thu, 21 Dec 2006) $

+ ***/

+

+public final class NTPUDPClient extends DatagramSocketClient

+{

+    /*** The default NTP port.  It is set to 123 according to RFC 1305. ***/

+    public static final int DEFAULT_PORT = 123;

+

+    private int _version = NtpV3Packet.VERSION_3;

+

+    /***

+     * Retrieves the time information from the specified server and port and

+     * returns it. The time is the number of miliiseconds since

+     * 00:00 (midnight) 1 January 1900 UTC, as specified by RFC 1305.

+     * This method reads the raw NTP packet and constructs a <i>TimeInfo</i>

+     * object that allows access to all the fields of the NTP message header.

+     * <p>

+     * @param host The address of the server.

+     * @param port The port of the service.

+     * @return The time value retrieved from the server.

+     * @exception IOException If an error occurs while retrieving the time.

+     ***/

+    public TimeInfo getTime(InetAddress host, int port) throws IOException

+    {

+        // if not connected then open to next available UDP port

+        if (!isOpen())

+        {

+            open();

+        }

+

+        NtpV3Packet message = new NtpV3Impl();

+        message.setMode(NtpV3Packet.MODE_CLIENT);

+        message.setVersion(_version);

+        DatagramPacket sendPacket = message.getDatagramPacket();

+        sendPacket.setAddress(host);

+        sendPacket.setPort(port);

+

+        NtpV3Packet recMessage = new NtpV3Impl();

+        DatagramPacket receivePacket = recMessage.getDatagramPacket();

+

+        /*

+         * Must minimize the time between getting the current time,

+         * timestamping the packet, and sending it out which

+         * introduces an error in the delay time.

+         * No extraneous logging and initializations here !!!

+         */

+        TimeStamp now = TimeStamp.getCurrentTime();

+

+        // Note that if you do not set the transmit time field then originating time

+        // in server response is all 0's which is "Thu Feb 07 01:28:16 EST 2036".

+        message.setTransmitTime(now);

+

+        _socket_.send(sendPacket);

+        _socket_.receive(receivePacket);

+

+        long returnTime = System.currentTimeMillis();

+        // create TimeInfo message container but don't pre-compute the details yet

+        TimeInfo info = new TimeInfo(recMessage, returnTime, false);

+

+        return info;

+    }

+

+    /***

+     * Retrieves the time information from the specified server on the

+     * default NTP port and returns it. The time is the number of miliiseconds

+     * since 00:00 (midnight) 1 January 1900 UTC, as specified by RFC 1305.

+     * This method reads the raw NTP packet and constructs a <i>TimeInfo</i>

+     * object that allows access to all the fields of the NTP message header.

+     * <p>

+     * @param host The address of the server.

+     * @return The time value retrieved from the server.

+     * @exception IOException If an error occurs while retrieving the time.

+     ***/

+    public TimeInfo getTime(InetAddress host) throws IOException

+    {

+        return getTime(host, NtpV3Packet.NTP_PORT);

+    }

+

+    /***

+     * Returns the NTP protocol version number that client sets on request packet

+     * that is sent to remote host (e.g. 3=NTP v3, 4=NTP v4, etc.)

+     *

+     * @return  the NTP protocol version number that client sets on request packet.

+     * @see #setVersion(int)

+     ***/

+    public int getVersion()

+    {

+        return _version;

+    }

+

+    /***

+     * Sets the NTP protocol version number that client sets on request packet

+     * communicate with remote host.

+     *

+     * @param version the NTP protocol version number

+     ***/

+    public void setVersion(int version)

+    {

+        _version = version;

+    }

+

+}