Java Code Examples for java.net.datagramsocket#setBroadcast()

/**
 * Constructs a <code>BLDevice</code>, with a device type (constants),
 * hostname and MAC address
 * 
 * @param deviceType
 *            Device type constants (<code>BLDevice.DEV_*</code>)
 * @param deviceDesc
 *            Friendly device description
 * @param host
 *            Hostname of target Broadlink device
 * @param mac
 *            MAC address of target Broadlink device
 * @throws IOException
 *             Problems on constructing a datagram socket
 */
protected BLDevice(short deviceType, String deviceDesc, String host, Mac mac) throws IOException {
    key = INITIAL_KEY;
    iv = INITIAL_IV;
    id = new byte[] { 0, 0, 0, 0 };

    pktCount = new Random().nextInt(0xffff);

    this.deviceType = deviceType;
    this.deviceDesc = deviceDesc;
    
    this.host = host;
    this.mac = mac;

    sock = new DatagramSocket();
    sock.setReuseAddress(true);
    sock.setBroadcast(true);
    aes = new AES(iv, key);
    alreadyAuthorized = false;
}
 

static void sendStartSignal(int port)
{
    try
    {
        DatagramSocket syncSocket = new DatagramSocket(null);
        syncSocket.setReuseAddress(true);
        syncSocket.setBroadcast(true);

        String msg = "SSI:STRT:RUN1"; //send in SSI format for compatibility
        byte[] data = msg.getBytes("ASCII");
        DatagramPacket packet = new DatagramPacket(data, data.length, Util.getBroadcastAddress(), port);
        syncSocket.send(packet);

        Log.i("start signal sent on port " + port);
    }
    catch(IOException e)
    {
        Log.e("network sync failed", e);
    }
}
 

static void sendStopSignal(int port)
{
    try
    {
        DatagramSocket syncSocket = new DatagramSocket(null);
        syncSocket.setReuseAddress(true);
        syncSocket.setBroadcast(true);

        String msg = "SSI:STOP:QUIT"; //send in SSI format for compatibility
        byte[] data = msg.getBytes("ASCII");
        DatagramPacket packet = new DatagramPacket(data, data.length, Util.getBroadcastAddress(), port);
        syncSocket.send(packet);

        Log.i("stop signal sent on port " + port);
    }
    catch(IOException e)
    {
        Log.e("network sync failed", e);
    }
}
 

@Override
public void run() {
    try {
        int port = NetworkUtil.BASE_PORT;
        do {
            socket = new DatagramSocket(port, InetAddress.getByName("0.0.0.0"));
            port--;
        } while (socket == null);

        socket.setBroadcast(true);

        while (true) {
            // Receive broadcast packet
            byte[] buffer = new byte[15000];
            DatagramPacket receivePacket = new DatagramPacket(buffer, buffer.length);
            socket.receive(receivePacket);
            Log.d("USER", "Received packet from: " + receivePacket.getAddress().getHostAddress());

            // Send reply
            byte[] replyPacket = SerializationUtil.serialize(reply);
            socket.send(new DatagramPacket(replyPacket, replyPacket.length, receivePacket.getAddress(), receivePacket.getPort()));
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}
 

@Override
public void run() {
    while (_running) {
        try {
            DatagramSocket dhcpSocket = new DatagramSocket(dhcpServerPort, InetAddress.getByAddress(new byte[] {0, 0, 0, 0}));
            dhcpSocket.setBroadcast(true);

            while (true) {
                byte[] buf = new byte[bufferSize];
                DatagramPacket dgp = new DatagramPacket(buf, buf.length);
                dhcpSocket.receive(dgp);
                // _executor.execute(new DhcpPacketParser(buf));
            }
        } catch (IOException e) {
            s_logger.debug(e.getMessage());
        }
    }
}
 

@Override
protected Void doInBackground(Void... params)
{
    Logging.info(this, "started, network=" + connectionState.isNetwork()
            + ", wifi=" + connectionState.isWifi());

    final Character[] models = new Character[]{ 'x', 'p' };
    int modelId = 0;

    try
    {
        final InetAddress target = InetAddress.getByName("255.255.255.255");

        final DatagramSocket socket = new DatagramSocket(null);
        socket.setReuseAddress(true);
        socket.setBroadcast(true);
        socket.setSoTimeout(500);
        socket.bind(new InetSocketAddress(ISCP_PORT));

        while (!isStopped())
        {
            request(socket, target, models[modelId]);
            modelId++;
            if (modelId > 1)
            {
                modelId = 0;
            }
        }
        socket.close();
    }
    catch (Exception e)
    {
        Logging.info(this, "Can not open socket: " + e.toString());
    }

    Logging.info(this, "stopped");
    return null;
}
 

@Override
public void run() {
    do {
        try {
            DatagramSocket sendSocket = new DatagramSocket();
            String msg = "Message from udp:" + String.valueOf((char) ('A' + count));
            byte[] buf = msg.getBytes();
            DatagramPacket packet = new DatagramPacket(buf, 0, buf.length, InetAddress.getByName("192.168.0.255"), 2000);
            sendSocket.setBroadcast(true);
            sendSocket.send(packet);
            sendSocket.close();
            System.out.println(msg);
            count++;
            if (count > 30) {
                count = -1;
            }
            Thread.sleep(2000);
        } catch (IOException | InterruptedException e) {
            e.printStackTrace();
            System.out.println("Error exit");
            break;
        }
    } while (true);

    System.exit(0);

}
 

@Override
protected void connect() throws Exception {

	// Start broadcast receiver
	broadcastReceiver = new DatagramSocket();
	broadcastReceiver.setReuseAddress(udpReuseAddr);
	broadcastReceiver.setBroadcast(true);
	broadcastReceiver.connect(InetAddress.getByName(udpAddress), udpPort);

	// Start thread
	super.connect();

	logger.info("Broadcast discovery service started on udp://" + udpAddress + ':' + udpPort + '.');
}
 

/**
 * ブロードキャストするかどうかをセット
 * @param broadcast
 * @throws SocketException
 */
public void setBroadcast(final boolean broadcast) throws SocketException {
	final DatagramSocket socket = channel != null ? channel.socket() : null;
	if (socket != null) {
		socket.setBroadcast(broadcast);
	}
}
 

@Override
public void run() {
    try {
        int port = NetworkUtil.BASE_PORT;
        boolean portAvailable = false;
        do {
            if (NetworkUtil.available(port))
                portAvailable = true;
            else
                port--;
        } while (!portAvailable);

        socket = new DatagramSocket(port, InetAddress.getByName("0.0.0.0"));
        socket.setBroadcast(true);

        while (true) {
            // Receive broadcast packet
            Log.d("USER", "Waiting for packet...");
            byte[] buffer = new byte[15000];
            DatagramPacket receivePacket = new DatagramPacket(buffer, buffer.length);
            socket.receive(receivePacket);
            Log.d("USER", "Received packet from: " + receivePacket.getAddress().getHostAddress());

            // Send reply
            byte[] replyPacket = SerializationUtil.serialize(reply);
            socket.send(new DatagramPacket(replyPacket, replyPacket.length, receivePacket.getAddress(), receivePacket.getPort()));
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}
 

/**
 *  Starts a new thread to reply to broadcast discovery requests from nodes.
 *
 * @throws SocketException if cannot bind UDP socket
 * @throws UnknownHostException if cannot bind to 0.0.0.0
 */
public void start() throws SocketException, UnknownHostException {
    broadcastSocket = new DatagramSocket(port, InetAddress.getByName("0.0.0.0"));
    broadcastSocket.setBroadcast(true);

    discoveryThread = new Thread(new Runnable() {
        @Override
        public void run() {
            for (;;) {
                try {
                    DatagramPacket nodePacket = new DatagramPacket(new byte[0], 0);
                    broadcastSocket.receive(nodePacket);

                    byte[] urlAsBytes = url.getBytes(BroadcastDiscoveryClient.BROADCAST_ENCODING);
                    DatagramPacket replyPacket = new DatagramPacket(urlAsBytes,
                                                                    urlAsBytes.length,
                                                                    nodePacket.getAddress(),
                                                                    nodePacket.getPort());
                    broadcastSocket.send(replyPacket);
                } catch (SocketException e) {
                    if (needsToStop) {
                        return;
                    } else {
                        logger.warn("Could not broadcast URL to node", e);
                    }
                } catch (Exception e) {
                    logger.warn("Could not broadcast URL to node", e);
                }
            }
        }
    }, "BroadcastDiscovery");
    discoveryThread.start();
}
 

public boolean open(int localport,int destport) {
    mDestPort = destport;        
    try {
        mSocket = new DatagramSocket(localport);
        mSocket.setBroadcast(true);
        mSocket.setReuseAddress(true);
        return true;
    } 
    catch (SocketException e) {         
        e.printStackTrace();
    }        
    return false;
}
 

public static NameServerProxy locateNS(String host, int port, byte[] hmacKey) throws IOException {
	if(host!=null) {
		if(port==0)
			port=Config.NS_PORT;
		NameServerProxy proxy=new NameServerProxy(host, port);
		proxy.pyroHmacKey = hmacKey;
		proxy.ping();
		return proxy;
	}
	if(port==0)
		port=Config.NS_BCPORT;
	DatagramSocket udpsock=new DatagramSocket();
	udpsock.setSoTimeout(3000);
	udpsock.setBroadcast(true);
	byte[] buf="GET_NSURI".getBytes();
	if(host==null)
		host="255.255.255.255";
	InetAddress address=InetAddress.getByName(host);
	DatagramPacket packet=new DatagramPacket(buf, buf.length, address, port);
	udpsock.send(packet);
	
	DatagramPacket response=new DatagramPacket(new byte[100], 100);
	try
	{
		udpsock.receive(response);
	}
	catch(SocketTimeoutException x)
	{
		// try localhost explicitly (if host wasn't localhost already)
		if(!host.startsWith("127.0") && !host.equals("localhost"))
			return locateNS("localhost", Config.NS_PORT, hmacKey);
		else
			throw x;
	}
	finally {
		udpsock.close();
	}
	String location=new String(response.getData(), 0, response.getLength());
	NameServerProxy nsp = new NameServerProxy(new PyroURI(location));
	nsp.pyroHmacKey = hmacKey;
	return nsp;
}
 

private void initializeSocketForBroadcasting() throws SocketException {
    socket = new DatagramSocket();
    socket.setBroadcast(true);
}
 

/**
 * Sends a compiled packet to a destination host and port, and receives a
 * datagram from the source port specified.
 * 
 * @param pkt
 *            The compiled packet to be sent
 * @param sourceIpAddr
 *            Source IP address to be binded for receiving datagrams
 * @param sourcePort
 *            Source Port to be bineded for receiving datagrams
 * @param destIpAddr
 *            Destination IP address
 * @param destPort
 *            Destination Port
 * @param timeout
 *            Socket timeout. 0 will disable the timeout
 * @param bufSize
 *            Receiving datagram's buffer size
 * @return The received datagram
 * @throws IOException
 *             Thrown if socket timed out, cannot bind source IP and source
 *             port, no permission, etc.
 */
public static DatagramPacket sendPkt(Packet pkt, InetAddress sourceIpAddr, int sourcePort, InetAddress destIpAddr,
        int destPort, int timeout, int bufSize) throws IOException {
	log.debug("sendPkt - call with create socket for: " + sourceIpAddr.getHostAddress() + " and port " + sourcePort);
    DatagramSocket sock = new DatagramSocket(sourcePort, sourceIpAddr);

    sock.setBroadcast(true);
    sock.setReuseAddress(true);

    DatagramPacket recePkt = sendPkt(sock, pkt, destIpAddr, destPort, timeout, bufSize);
    sock.close();

    return recePkt;
}