/*
* $Id$
*
* 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;
import java.net.NoRouteToHostException;
import java.util.ArrayList;
import java.util.ConcurrentModificationException;
import java.util.List;
import java.util.Vector;
/**
* @author epr
*/
public class IPv4RoutingTable {
/** All entries as instanceof IPv4Route */
private final Vector<IPv4Route> entries = new Vector<IPv4Route>();
/**
* Create a new instance
*/
public IPv4RoutingTable() {
}
/**
* Gets the number of entries
*/
public int getSize() {
return entries.size();
}
/**
* Get an entry at a given index
*
* @param index
*/
public IPv4Route get(int index) {
return (IPv4Route) entries.get(index);
}
/**
* Add an entry
*
* @param entry
*/
public void add(IPv4Route entry) {
entries.add(entry);
}
/**
* Remove a given entry
*
* @param entry
*/
public void remove(IPv4Route entry) {
entries.remove(entry);
}
/**
* Get all entries
*
* @see IPv4Route
* @return a list of IPv4Route entries.
*/
public List<IPv4Route> entries() {
return new ArrayList<IPv4Route>(entries);
}
/**
* Search for a route to the given destination
*
* @param destination
* @throws NoRouteToHostException No route has been found
* @return The route that has been selected.
*/
public IPv4Route search(IPv4Address destination) throws NoRouteToHostException {
while (true) {
try {
// First search for a matching host-address route
for (IPv4Route r : entries) {
if (r.isHost() && r.isUp()) {
if (r.getDestination().equals(destination)) {
return r;
}
}
}
// No direct host found, search through the networks
for (IPv4Route r : entries) {
if (r.isNetwork() && r.isUp()) {
if (r.getDestination().matches(destination, r.getSubnetmask())) {
return r;
}
}
}
// No network found, search for the default gateway
for (IPv4Route r : entries) {
if (r.isGateway() && r.isUp()) {
return r;
}
}
// No route found
throw new NoRouteToHostException(destination.toString());
} catch (ConcurrentModificationException ex) {
// The list of entries was modified, while we are searching,
// Just loop and try it again
}
}
}
/**
* Convert to a String representation
* @see java.lang.Object#toString()
*/
public String toString() {
final StringBuilder b = new StringBuilder();
for (IPv4Route r : entries) {
b.append(r);
b.append('\n');
}
return b.toString();
}
}