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/*
* Copyright (C) 2020 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 com.android.net.module.util;
import android.annotation.NonNull;
import android.os.Parcel;
import android.util.Log;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.UnknownHostException;
/**
* Collection of utilities to interact with {@link InetAddress}
* @hide
*/
public class InetAddressUtils {
private static final String TAG = InetAddressUtils.class.getSimpleName();
private static final int INET6_ADDR_LENGTH = 16;
/**
* Writes an InetAddress to a parcel. The address may be null. This is likely faster than
* calling writeSerializable.
* @hide
*/
public static void parcelInetAddress(Parcel parcel, InetAddress address, int flags) {
byte[] addressArray = (address != null) ? address.getAddress() : null;
parcel.writeByteArray(addressArray);
if (address instanceof Inet6Address) {
final Inet6Address v6Address = (Inet6Address) address;
final boolean hasScopeId = v6Address.getScopeId() != 0;
parcel.writeBoolean(hasScopeId);
if (hasScopeId) parcel.writeInt(v6Address.getScopeId());
}
}
/**
* Reads an InetAddress from a parcel. Returns null if the address that was written was null
* or if the data is invalid.
* @hide
*/
public static InetAddress unparcelInetAddress(Parcel in) {
byte[] addressArray = in.createByteArray();
if (addressArray == null) {
return null;
}
try {
if (addressArray.length == INET6_ADDR_LENGTH) {
final boolean hasScopeId = in.readBoolean();
final int scopeId = hasScopeId ? in.readInt() : 0;
return Inet6Address.getByAddress(null /* host */, addressArray, scopeId);
}
return InetAddress.getByAddress(addressArray);
} catch (UnknownHostException e) {
return null;
}
}
/**
* Create a Inet6Address with scope id if it is a link local address. Otherwise, returns the
* original address.
*/
public static Inet6Address withScopeId(@NonNull final Inet6Address addr, int scopeid) {
if (!addr.isLinkLocalAddress()) {
return addr;
}
try {
return Inet6Address.getByAddress(null /* host */, addr.getAddress(),
scopeid);
} catch (UnknownHostException impossible) {
Log.wtf(TAG, "Cannot construct scoped Inet6Address with Inet6Address.getAddress("
+ addr.getHostAddress() + "): ", impossible);
return null;
}
}
private InetAddressUtils() {}
}
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