Examples of org.apache.commons.net.chargen.CharGenUDPClient

org.apache.commons.net.chargen.CharGenUDPClient
The CharGenUDPClient class is a UDP implementation of a client for the character generator protocol described in RFC 864. It can also be used for Systat (RFC 866), Quote of the Day (RFC 865), and netstat (port 15). All of these protocols involve sending a datagram to the appropriate port, and reading data contained in one or more reply datagrams. The chargen and quote of the day protocols only send one reply datagram containing 512 bytes or less of data. The other protocols may reply with more than one datagram, in which case you must wait for a timeout to determine that all reply datagrams have been sent.
To use the CharGenUDPClient class, just open a local UDP port with {@link org.apache.commons.net.DatagramSocketClient#open open }and call {@link #send send } to send the datagram that willinitiate the data reply. For chargen or quote of the day, just call {@link #receive receive }, and you're done. For netstat and systat, call receive in a while loop, and catch a SocketException and InterruptedIOException to detect a timeout (don't forget to set the timeout duration beforehand). Don't forget to call {@link org.apache.commons.net.DatagramSocketClient#close close() }to clean up properly.

@author Daniel F. Savarese @see CharGenTCPClient

    public static final void chargenUDP(String host) throws IOException
    {
        int packets = 50;
        byte[] data;
        InetAddress address;
        CharGenUDPClient client;


        address = InetAddress.getByName(host);
        client = new CharGenUDPClient();


        client.open();
        // If we don't receive a return packet within 5 seconds, assume
        // the packet is lost.
        client.setSoTimeout(5000);


        while (packets-- > 0)
        {
            client.send(address);


            try
            {
                data = client.receive();
            }
            // Here we catch both SocketException and InterruptedIOException,
            // because even though the JDK 1.1 docs claim that
            // InterruptedIOException is thrown on a timeout, it seems
            // SocketException is also thrown.
            catch (SocketException e)
            {
                // We timed out and assume the packet is lost.
                System.err.println("SocketException: Timed out and dropped packet");
                continue;
            }
            catch (InterruptedIOException e)
            {
                // We timed out and assume the packet is lost.
                System.err.println(
                    "InterruptedIOException: Timed out and dropped packet");
                continue;
            }
            System.out.write(data);
            System.out.flush();
        }


        client.close();
    }

View Full Code Here

    public static final void chargenUDP(String host) throws IOException
    {
        int packets = 50;
        byte[] data;
        InetAddress address;
        CharGenUDPClient client;


        address = InetAddress.getByName(host);
        client = new CharGenUDPClient();


        client.open();
        // If we don't receive a return packet within 5 seconds, assume
        // the packet is lost.
        client.setSoTimeout(5000);


        while (packets-- > 0)
        {
            client.send(address);


            try
            {
                data = client.receive();
            }
            // Here we catch both SocketException and InterruptedIOException,
            // because even though the JDK 1.1 docs claim that
            // InterruptedIOException is thrown on a timeout, it seems
            // SocketException is also thrown.
            catch (SocketException e)
            {
                // We timed out and assume the packet is lost.
                System.err.println("SocketException: Timed out and dropped packet");
                continue;
            }
            catch (InterruptedIOException e)
            {
                // We timed out and assume the packet is lost.
                System.err.println(
                    "InterruptedIOException: Timed out and dropped packet");
                continue;
            }
            System.out.write(data);
            System.out.flush();
        }


        client.close();
    }

View Full Code Here

    public static final void chargenUDP(String host) throws IOException
    {
        int packets = 50;
        byte[] data;
        InetAddress address;
        CharGenUDPClient client;


        address = InetAddress.getByName(host);
        client = new CharGenUDPClient();


        client.open();
        // If we don't receive a return packet within 5 seconds, assume
        // the packet is lost.
        client.setSoTimeout(5000);


        while (packets-- > 0)
        {
            client.send(address);


            try
            {
                data = client.receive();
            }
            // Here we catch both SocketException and InterruptedIOException,
            // because even though the JDK 1.1 docs claim that
            // InterruptedIOException is thrown on a timeout, it seems
            // SocketException is also thrown.
            catch (SocketException e)
            {
                // We timed out and assume the packet is lost.
                System.err.println("SocketException: Timed out and dropped packet");
                continue;
            }
            catch (InterruptedIOException e)
            {
                // We timed out and assume the packet is lost.
                System.err.println(
                    "InterruptedIOException: Timed out and dropped packet");
                continue;
            }
            System.out.write(data);
            System.out.flush();
        }


        client.close();
    }

View Full Code Here

    public static final void chargenUDP(String host) throws IOException
    {
        int packets = 50;
        byte[] data;
        InetAddress address;
        CharGenUDPClient client;


        address = InetAddress.getByName(host);
        client = new CharGenUDPClient();


        client.open();
        // If we don't receive a return packet within 5 seconds, assume
        // the packet is lost.
        client.setSoTimeout(5000);


        while (packets-- > 0)
        {
            client.send(address);


            try
            {
                data = client.receive();
            }
            // Here we catch both SocketException and InterruptedIOException,
            // because even though the JDK 1.1 docs claim that
            // InterruptedIOException is thrown on a timeout, it seems
            // SocketException is also thrown.
            catch (SocketException e)
            {
                // We timed out and assume the packet is lost.
                System.err.println("SocketException: Timed out and dropped packet");
                continue;
            }
            catch (InterruptedIOException e)
            {
                // We timed out and assume the packet is lost.
                System.err.println(
                    "InterruptedIOException: Timed out and dropped packet");
                continue;
            }
            System.out.write(data);
            System.out.flush();
        }


        client.close();
    }

View Full Code Here

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Related Classes of org.apache.commons.net.chargen.CharGenUDPClient

examples.chargen

examples.unix.chargen

java.net.DatagramPacket

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