/*
* $Id$
*
* Copyright (C) 2003-2014 JNode.org
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.net.ipv4.bootp;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.Inet4Address;
import java.net.MulticastSocket;
import java.net.NetworkInterface;
import org.apache.log4j.Logger;
import org.jnode.net.HardwareAddress;
import org.jnode.net.ipv4.IPv4Address;
/**
* System independent base class.
* Implementations should override doConfigure.
*
* @author markhale
*/
public class AbstractBOOTPClient {
/**
* My logger
*/
private static final Logger log = Logger.getLogger(AbstractBOOTPClient.class);
private static final int RECEIVE_TIMEOUT = 10 * 1000; // 10 seconds
public static final int SERVER_PORT = 67;
public static final int CLIENT_PORT = 68;
protected MulticastSocket socket;
/**
* Configure the given device using BOOTP
*
* @param deviceName network interface
*/
protected final void configureDevice(final String deviceName, final HardwareAddress hwAddress)
throws IOException {
// Open a socket
socket = new MulticastSocket(CLIENT_PORT);
try {
// Prepare the socket
socket.setBroadcast(true);
socket.setNetworkInterface(NetworkInterface.getByName(deviceName));
socket.setSoTimeout(RECEIVE_TIMEOUT);
// Create the BOOTP header
final Inet4Address myIP = null; // any address
final int transactionID = (int) (System.currentTimeMillis() & 0xFFFFFFFF);
BOOTPHeader hdr =
new BOOTPHeader(BOOTPHeader.BOOTREQUEST, transactionID, 0, myIP, hwAddress);
// Send the packet
final DatagramPacket packet = createRequestPacket(hdr);
packet.setAddress(IPv4Address.BROADCAST_ADDRESS);
packet.setPort(SERVER_PORT);
socket.send(packet);
boolean configured;
do {
// Wait for a response
socket.receive(packet);
// Process the response
configured = processResponse(transactionID, packet);
} while (!configured);
} finally {
socket.close();
}
socket = null;
}
/**
* Create a BOOTP request packet
*/
protected DatagramPacket createRequestPacket(BOOTPHeader hdr) throws IOException {
return new BOOTPMessage(hdr).toDatagramPacket();
}
/**
* Process a BOOTP response
*
* @param packet
* @return true if the device has been configured, false otherwise
*/
protected boolean processResponse(int transactionID, DatagramPacket packet) throws IOException {
final BOOTPHeader hdr = new BOOTPHeader(packet);
if (hdr.getOpcode() != BOOTPHeader.BOOTREPLY) {
// Not a response
return false;
}
if (hdr.getTransactionID() != transactionID) {
// Not for me
return false;
}
doConfigure(hdr);
return true;
}
/**
* Performs the actual configuration of a network device based on the
* settings in a BOOTP header.
*/
protected void doConfigure(BOOTPHeader hdr) throws IOException {
log.info("Got Client IP address : " + hdr.getClientIPAddress());
log.info("Got Your IP address : " + hdr.getYourIPAddress());
log.info("Got Server IP address : " + hdr.getServerIPAddress());
log.info("Got Gateway IP address : " + hdr.getGatewayIPAddress());
}
}