1 /* 2 * Copyright (C) 2020 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.net.module.util; 18 19 import android.os.Parcel; 20 21 import java.net.Inet6Address; 22 import java.net.InetAddress; 23 import java.net.UnknownHostException; 24 25 /** 26 * Collection of utilities to interact with {@link InetAddress} 27 * @hide 28 */ 29 public class InetAddressUtils { 30 31 private static final int INET6_ADDR_LENGTH = 16; 32 33 /** 34 * Writes an InetAddress to a parcel. The address may be null. This is likely faster than 35 * calling writeSerializable. 36 * @hide 37 */ parcelInetAddress(Parcel parcel, InetAddress address, int flags)38 public static void parcelInetAddress(Parcel parcel, InetAddress address, int flags) { 39 byte[] addressArray = (address != null) ? address.getAddress() : null; 40 parcel.writeByteArray(addressArray); 41 if (address instanceof Inet6Address) { 42 final Inet6Address v6Address = (Inet6Address) address; 43 final boolean hasScopeId = v6Address.getScopeId() != 0; 44 parcel.writeBoolean(hasScopeId); 45 if (hasScopeId) parcel.writeInt(v6Address.getScopeId()); 46 } 47 48 } 49 50 /** 51 * Reads an InetAddress from a parcel. Returns null if the address that was written was null 52 * or if the data is invalid. 53 * @hide 54 */ unparcelInetAddress(Parcel in)55 public static InetAddress unparcelInetAddress(Parcel in) { 56 byte[] addressArray = in.createByteArray(); 57 if (addressArray == null) { 58 return null; 59 } 60 61 try { 62 if (addressArray.length == INET6_ADDR_LENGTH) { 63 final boolean hasScopeId = in.readBoolean(); 64 final int scopeId = hasScopeId ? in.readInt() : 0; 65 return Inet6Address.getByAddress(null /* host */, addressArray, scopeId); 66 } 67 68 return InetAddress.getByAddress(addressArray); 69 } catch (UnknownHostException e) { 70 return null; 71 } 72 } 73 InetAddressUtils()74 private InetAddressUtils() {} 75 } 76