Example usage for java.net DatagramPacket DatagramPacket

Introduction

In this page you can find the example usage for java.net DatagramPacket DatagramPacket.

Prototype

public DatagramPacket(byte buf[], int length, InetAddress address, int port) 

Source Link

Document

Constructs a datagram packet for sending packets of length length to the specified port number on the specified host.

Usage

From source file:org.eredlab.g4.ccl.net.tftp.TFTPRequestPacket.java

/***
 * Creates a UDP datagram containing all the TFTP
 * request packet data in the proper format.
 * This is a method exposed to the programmer in case he
 * wants to implement his own TFTP client instead of using
 * the {@link org.apache.commons.net.tftp.TFTPClient}
 * class.  Under normal circumstances, you should not have a need to call
 * this method.// www  .jav  a  2 s .  c o m
 * <p>
 * @return A UDP datagram containing the TFTP request packet.
 ***/
public final DatagramPacket newDatagram() {
    int fileLength, modeLength;
    byte[] data;

    fileLength = _filename.length();
    modeLength = _modeBytes[_mode].length;

    data = new byte[fileLength + modeLength + 4];
    data[0] = 0;
    data[1] = (byte) _type;
    System.arraycopy(_filename.getBytes(), 0, data, 2, fileLength);
    data[fileLength + 2] = 0;
    System.arraycopy(_modeBytes[_mode], 0, data, fileLength + 3, modeLength);

    return new DatagramPacket(data, data.length, _address, _port);
}

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From source file:com.example.nate.cloudcar.MainActivity.java

public void socketSend(final String chan, final int pos) {
    new Thread(new Runnable() {
        public void run() {
            try {
                int msgLength = chan.length();
                DatagramSocket s = new DatagramSocket();
                InetAddress local = InetAddress.getByName("192.168.10.200");
                byte[] message = chan.getBytes();
                DatagramPacket chanPacket = new DatagramPacket(message, msgLength, local, server_port);
                s.send(chanPacket);//  w w w . j a  v  a2  s . co  m
                msgLength = Integer.toString(pos).length();
                message = Integer.toString(pos).getBytes();
                DatagramPacket posPacket = new DatagramPacket(message, msgLength, local, server_port);
                s.send(posPacket);
            } catch (UnknownHostException e) {
                e.printStackTrace();
            } catch (SocketException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }).start();
    Thread.currentThread().interrupted();

}

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From source file:org.opennms.netmgt.syslogd.SyslogdEventdLoadIT.java

@Test(timeout = 120000)
@Transactional//w w  w  . j  av a  2  s  .c  om
public void testRfcSyslog() throws Exception {
    loadSyslogConfiguration("/etc/syslogd-rfc-configuration.xml");

    startSyslogdGracefully();

    m_eventCounter.anticipate();

    InetAddress address = InetAddress.getLocalHost();

    // handle an invalid packet
    byte[] bytes = "<34>1 2010-08-19T22:14:15.000Z localhost - - - - BOMfoo0: load test 0 on tty1\0".getBytes();
    DatagramPacket pkt = new DatagramPacket(bytes, bytes.length, address, SyslogClient.PORT);
    new SyslogConnectionHandlerDefaultImpl().handleSyslogConnection(new SyslogConnection(pkt, m_config));

    // handle a valid packet
    bytes = "<34>1 2003-10-11T22:14:15.000Z plonk -ev/pts/8\0".getBytes();
    pkt = new DatagramPacket(bytes, bytes.length, address, SyslogClient.PORT);
    new SyslogConnectionHandlerDefaultImpl().handleSyslogConnection(new SyslogConnection(pkt, m_config));

    m_eventCounter.waitForFinish(120000);

    assertEquals(1, m_eventCounter.getCount());
}

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From source file:org.openhab.binding.yeelight.internal.YeelightBinding.java

private void discoverYeelightDevices() {
    String url = null;/* w  w w .  j  a v a2  s. co  m*/

    try {
        StringBuilder sb = new StringBuilder();
        sb.append("M-SEARCH * HTTP/1.1\r\n");
        sb.append("MAN: \"ssdp:discover\"\r\n");
        sb.append("ST: wifi_bulb\r\n");

        byte[] sendData = sb.toString().getBytes("UTF-8");
        InetAddress addr = InetAddress.getByName(MCAST_ADDR);
        DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, addr, MCAST_PORT);

        socket.send(sendPacket);
    } catch (MalformedURLException e) {
        logger.error("The URL '{}' is malformed: ", url, e);
    } catch (Exception e) {
        logger.error("Cannot get Yeelight login cookie: ", e);
    }
}

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From source file:org.lwes.emitter.DatagramSocketEventEmitter.java

/**
 * @param bytes the byte array to emit/*  w w w . j  a  v a2  s  .  c  o  m*/
 * @param address the address to use
 * @param port the port to use
 * @throws IOException throws an IOException if there is a network error
 * @return number of bytes emitted
 */
protected int emit(byte[] bytes, InetAddress address, int port) throws IOException {
    /* don't send null bytes */
    if (bytes == null)
        return 0;

    if (socket == null || socket.isClosed()) {
        throw new IOException("Socket wasn't initialized or was closed.");
    }

    DatagramPacket dp = new DatagramPacket(bytes, bytes.length, address, port);
    socket.send(dp);

    if (log.isTraceEnabled()) {
        log.trace("Sent to network '" + NumberCodec.byteArrayToHexString(dp.getData(), 0, dp.getLength()));
    }
    return bytes.length;
}

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From source file:org.lwes.emitter.MulticastEventEmitter.java

/**
 * Emits a byte array to the network./*from w  w  w  . j  av  a2s .  c  o m*/
 *
 * @param bytes the byte array to emit
 * @throws IOException throws an IOException if there is a network error.
 */
@Override
protected void emit(byte[] bytes) throws IOException {
    /* don't bother with empty arrays */
    if (bytes == null) {
        return;
    }
    if (socket == null || socket.isClosed()) {
        throw new IOException("Socket wasn't initialized or was closed.");
    }

    /* construct a datagram */
    DatagramPacket dp = new DatagramPacket(bytes, bytes.length, address, port);
    socket.send(dp);
}

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From source file:net.sbbi.upnp.jmx.UPNPMBeanDevicesDiscoveryHandler.java

private void sendByeBye(UPNPMBeanDevice dv) throws IOException {
    InetAddress group = InetAddress.getByName("239.255.255.250");
    java.net.MulticastSocket multi = new java.net.MulticastSocket(bindAddress.getPort());
    multi.setInterface(bindAddress.getAddress());
    multi.setTimeToLive(dv.getSSDPTTL());

    List packets = getByeByeReplyMessages(dv);
    for (int i = 0; i < packets.size(); i++) {
        String packet = (String) packets.get(i);
        if (log.isDebugEnabled())
            log.debug("Sending ssdp:byebye message on 239.255.255.250:1900 multicast address:\n"
                    + packet.toString());
        byte[] pk = packet.getBytes();
        multi.send(new DatagramPacket(pk, pk.length, group, 1900));
    }//from  w  ww .  j  av  a2  s.  c o  m
    multi.close();
}

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From source file:snapshotTools.java

private String callOvnmanager(String node, String action) {
    String result = "";
    DatagramSocket socket = null;
    int serverPort = 9999;
    DatagramPacket packet2Send;/*w  w  w .  ja v a  2 s .com*/
    DatagramPacket receivedPacket;
    InetAddress theServerAddress;
    byte[] outBuffer;
    byte[] inBuffer;
    inBuffer = new byte[8192];
    outBuffer = new byte[8192];
    try {
        HttpSession session = RuntimeAccess.getInstance().getSession();
        String sessionUser = (String) session.getAttribute("User");
        if (sessionUser == null) {
            sessionUser = "administrator";
        }
        JSONObject joCmd = new JSONObject();
        JSONObject joAction = new JSONObject(action);
        joCmd.put("sender", sessionUser);
        joCmd.put("target", "SNAPSHOT");
        joCmd.put("node", node);
        joCmd.put("action", joAction);
        String output = joCmd.toString();

        socket = new DatagramSocket();
        String actionName = joAction.get("name").toString();
        if (actionName.equals("create")) {
            socket.setSoTimeout(180000);
        } else {
            socket.setSoTimeout(60000);
        }

        InetAddress serverInet = InetAddress.getByName("localhost");
        socket.connect(serverInet, serverPort);
        outBuffer = output.getBytes();
        packet2Send = new DatagramPacket(outBuffer, outBuffer.length, serverInet, serverPort);

        try {
            // send the data
            socket.send(packet2Send);
            receivedPacket = new DatagramPacket(inBuffer, inBuffer.length);
            socket.receive(receivedPacket);
            // the server response is...
            result = new String(receivedPacket.getData(), 0, receivedPacket.getLength());
            session.setAttribute("LastActive", System.currentTimeMillis());
        } catch (Exception excep) {
            String msg = excep.getMessage();
            //String msg = excep.toString();
            joCmd.remove("action");
            joAction.put("result", "Error:" + msg);
            joCmd.put("action", joAction);
            result = joCmd.toString();
        }
        socket.close();

    } catch (Exception e) {
        log(ERROR, "callOvnmanager", e);
        return e.toString();
    }
    return result;
}

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From source file:org.nebulaframework.discovery.multicast.MulticastDiscovery.java

/**
 * Discovery Process to identify Clusters with in 
 * network.//from  ww w . j  a v  a  2  s .c  om
 * 
 * @throws IOException if occurred during operation
 */
private void doDiscover() throws IOException {

    // Send Request
    byte[] greet = GREET_MSG.getBytes("UTF-8");
    DatagramPacket request = new DatagramPacket(greet, greet.length, SERVICE_REQUEST_IP, SERVICE_PORT);
    MulticastSocket reqSock = new MulticastSocket();
    reqSock.send(request);

    // Wait for Response
    MulticastSocket resSock = new MulticastSocket(SERVICE_PORT);
    resSock.joinGroup(SERVICE_RESPONSE_IP);

    // 9 = # of bytes for an IP Address + 5 byte port
    DatagramPacket response = new DatagramPacket(new byte[9], 9);

    // Receive
    resSock.setSoTimeout((int) TIMEOUT);
    try {
        resSock.receive(response);
    } catch (SocketTimeoutException e) {
        log.debug("[MulticastDiscovery] Receive Timeout");
        return;
    }

    byte[] data = response.getData();

    byte[] ipBytes = Arrays.copyOfRange(data, 0, 4);
    byte[] portBytes = Arrays.copyOfRange(data, 4, 9);

    InetAddress ip = InetAddress.getByAddress(ipBytes);
    StringBuilder sb = new StringBuilder(ip.getHostAddress());
    sb.append(":");
    for (byte b : portBytes) {
        sb.append(b);
    }

    this.cluster = sb.toString();
}

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From source file:org.opennms.netmgt.syslogd.SyslogdEventdLoadIT.java

@Test(timeout = 120000)
@Transactional//from w w w.j  ava 2s .c o m
public void testNGSyslog() throws Exception {
    loadSyslogConfiguration("/etc/syslogd-syslogng-configuration.xml");

    startSyslogdGracefully();

    m_eventCounter.anticipate();

    InetAddress address = InetAddress.getLocalHost();

    // handle an invalid packet
    byte[] bytes = "<34>main: 2010-08-19 localhost foo0: load test 0 on tty1\0".getBytes();
    DatagramPacket pkt = new DatagramPacket(bytes, bytes.length, address, SyslogClient.PORT);
    new SyslogConnectionHandlerDefaultImpl().handleSyslogConnection(new SyslogConnection(pkt, m_config));

    // handle a valid packet
    bytes = "<34>monkeysatemybrain!\0".getBytes();
    pkt = new DatagramPacket(bytes, bytes.length, address, SyslogClient.PORT);
    new SyslogConnectionHandlerDefaultImpl().handleSyslogConnection(new SyslogConnection(pkt, m_config));

    m_eventCounter.waitForFinish(120000);

    assertEquals(1, m_eventCounter.getCount());
}

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