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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.net;
import android.os.Parcel;
import android.os.Parcelable;
import java.net.UnknownHostException;
import java.net.InetAddress;
import java.net.Inet4Address;
import java.net.Inet6Address;
import java.util.Collection;
/**
* A simple container for route information.
*
* @hide
*/
public class RouteInfo implements Parcelable {
/**
* The IP destination address for this route.
*/
private final LinkAddress mDestination;
/**
* The gateway address for this route.
*/
private final InetAddress mGateway;
private final boolean mIsDefault;
public RouteInfo(LinkAddress destination, InetAddress gateway) {
if (destination == null) {
if (gateway != null) {
if (gateway instanceof Inet4Address) {
destination = new LinkAddress(Inet4Address.ANY, 0);
} else {
destination = new LinkAddress(Inet6Address.ANY, 0);
}
} else {
// no destination, no gateway. invalid.
throw new RuntimeException("Invalid arguments passed in.");
}
}
if (gateway == null) {
if (destination.getAddress() instanceof Inet4Address) {
gateway = Inet4Address.ANY;
} else {
gateway = Inet6Address.ANY;
}
}
mDestination = new LinkAddress(NetworkUtils.getNetworkPart(destination.getAddress(),
destination.getNetworkPrefixLength()), destination.getNetworkPrefixLength());
mGateway = gateway;
mIsDefault = isDefault();
}
public RouteInfo(InetAddress gateway) {
this(null, gateway);
}
public static RouteInfo makeHostRoute(InetAddress host) {
return makeHostRoute(host, null);
}
public static RouteInfo makeHostRoute(InetAddress host, InetAddress gateway) {
if (host == null) return null;
if (host instanceof Inet4Address) {
return new RouteInfo(new LinkAddress(host, 32), gateway);
} else {
return new RouteInfo(new LinkAddress(host, 128), gateway);
}
}
private boolean isDefault() {
boolean val = false;
if (mGateway != null) {
if (mGateway instanceof Inet4Address) {
val = (mDestination == null || mDestination.getNetworkPrefixLength() == 0);
} else {
val = (mDestination == null || mDestination.getNetworkPrefixLength() == 0);
}
}
return val;
}
public LinkAddress getDestination() {
return mDestination;
}
public InetAddress getGateway() {
return mGateway;
}
public boolean isDefaultRoute() {
return mIsDefault;
}
public String toString() {
String val = "";
if (mDestination != null) val = mDestination.toString();
if (mGateway != null) val += " -> " + mGateway.getHostAddress();
return val;
}
public int describeContents() {
return 0;
}
public void writeToParcel(Parcel dest, int flags) {
if (mDestination == null) {
dest.writeByte((byte) 0);
} else {
dest.writeByte((byte) 1);
dest.writeByteArray(mDestination.getAddress().getAddress());
dest.writeInt(mDestination.getNetworkPrefixLength());
}
if (mGateway == null) {
dest.writeByte((byte) 0);
} else {
dest.writeByte((byte) 1);
dest.writeByteArray(mGateway.getAddress());
}
}
public static final Creator<RouteInfo> CREATOR =
new Creator<RouteInfo>() {
public RouteInfo createFromParcel(Parcel in) {
InetAddress destAddr = null;
int prefix = 0;
InetAddress gateway = null;
if (in.readByte() == 1) {
byte[] addr = in.createByteArray();
prefix = in.readInt();
try {
destAddr = InetAddress.getByAddress(addr);
} catch (UnknownHostException e) {}
}
if (in.readByte() == 1) {
byte[] addr = in.createByteArray();
try {
gateway = InetAddress.getByAddress(addr);
} catch (UnknownHostException e) {}
}
LinkAddress dest = null;
if (destAddr != null) {
dest = new LinkAddress(destAddr, prefix);
}
return new RouteInfo(dest, gateway);
}
public RouteInfo[] newArray(int size) {
return new RouteInfo[size];
}
};
private boolean matches(InetAddress destination) {
if (destination == null) return false;
// if the destination is present and the route is default.
// return true
if (isDefault()) return true;
// match the route destination and destination with prefix length
InetAddress dstNet = NetworkUtils.getNetworkPart(destination,
mDestination.getNetworkPrefixLength());
return mDestination.getAddress().equals(dstNet);
}
/**
* Find the route from a Collection of routes that best matches a given address.
* May return null if no routes are applicable.
* @param routes a Collection of RouteInfos to chose from
* @param dest the InetAddress your trying to get to
* @return the RouteInfo from the Collection that best fits the given address
*/
public static RouteInfo selectBestRoute(Collection<RouteInfo> routes, InetAddress dest) {
if ((routes == null) || (dest == null)) return null;
RouteInfo bestRoute = null;
// pick a longest prefix match under same address type
for (RouteInfo route : routes) {
if (NetworkUtils.addressTypeMatches(route.mDestination.getAddress(), dest)) {
if ((bestRoute != null) &&
(bestRoute.mDestination.getNetworkPrefixLength() >=
route.mDestination.getNetworkPrefixLength())) {
continue;
}
if (route.matches(dest)) bestRoute = route;
}
}
return bestRoute;
}
}
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