1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package java.net; 19 20 import java.io.ObjectStreamException; 21 import java.nio.ByteOrder; 22 import libcore.io.Memory; 23 import static android.system.OsConstants.*; 24 25 /** 26 * An IPv4 address. See {@link InetAddress}. 27 */ 28 public final class Inet4Address extends InetAddress { 29 30 private static final long serialVersionUID = 3286316764910316507L; 31 32 /** 33 * @hide 34 */ 35 public static final InetAddress ANY = 36 new Inet4Address(new byte[] { 0, 0, 0, 0 }, null); 37 38 /** 39 * @hide 40 */ 41 public static final InetAddress ALL = 42 new Inet4Address(new byte[] { (byte) 255, (byte) 255, 43 (byte) 255, (byte) 255 }, null); 44 45 /** 46 * @hide 47 */ 48 public static final InetAddress LOOPBACK = 49 new Inet4Address(new byte[] { 127, 0, 0, 1 }, "localhost"); 50 Inet4Address(byte[] ipaddress, String hostName)51 Inet4Address(byte[] ipaddress, String hostName) { 52 super(AF_INET, ipaddress, hostName); 53 } 54 isAnyLocalAddress()55 @Override public boolean isAnyLocalAddress() { 56 return ipaddress[0] == 0 && ipaddress[1] == 0 && ipaddress[2] == 0 && ipaddress[3] == 0; // 0.0.0.0 57 } 58 isLinkLocalAddress()59 @Override public boolean isLinkLocalAddress() { 60 // The RI does not return true for loopback addresses even though RFC 3484 says to do so. 61 return ((ipaddress[0] & 0xff) == 169) && ((ipaddress[1] & 0xff) == 254); // 169.254/16 62 } 63 isLoopbackAddress()64 @Override public boolean isLoopbackAddress() { 65 return ((ipaddress[0] & 0xff) == 127); // 127/8 66 } 67 isMCGlobal()68 @Override public boolean isMCGlobal() { 69 // Check if we have a prefix of 1110 70 if (!isMulticastAddress()) { 71 return false; 72 } 73 74 int address = Memory.peekInt(ipaddress, 0, ByteOrder.BIG_ENDIAN); 75 /* 76 * Now check the boundaries of the global space if we have an address 77 * that is prefixed by something less than 111000000000000000000001 78 * (fortunately we don't have to worry about sign after shifting 8 bits 79 * right) it is not multicast. ( < 224.0.1.0) 80 */ 81 if (address >>> 8 < 0xE00001) { 82 return false; 83 } 84 85 /* 86 * Now check the high boundary which is prefixed by 11101110 = 0xEE. If 87 * the value is higher than this than it is not MCGlobal ( > 88 * 238.255.255.255 ) 89 */ 90 if (address >>> 24 > 0xEE) { 91 return false; 92 } 93 94 return true; 95 } 96 isMCLinkLocal()97 @Override public boolean isMCLinkLocal() { 98 return ((ipaddress[0] & 0xff) == 224) && (ipaddress[1] == 0) && (ipaddress[2] == 0); // 224.0.0/24 99 } 100 isMCNodeLocal()101 @Override public boolean isMCNodeLocal() { 102 return false; 103 } 104 isMCOrgLocal()105 @Override public boolean isMCOrgLocal() { 106 return ((ipaddress[0] & 0xff) == 239) && ((ipaddress[1] & 0xfc) == 192); // 239.192/14 107 } 108 isMCSiteLocal()109 @Override public boolean isMCSiteLocal() { 110 return ((ipaddress[0] & 0xff) == 239) && ((ipaddress[1] & 0xff) == 255); // 239.255/16 111 } 112 isMulticastAddress()113 @Override public boolean isMulticastAddress() { 114 return (ipaddress[0] & 0xf0) == 224; // 224/4 115 } 116 isSiteLocalAddress()117 @Override public boolean isSiteLocalAddress() { 118 if ((ipaddress[0] & 0xff) == 10) { // 10/8 119 return true; 120 } else if (((ipaddress[0] & 0xff) == 172) && ((ipaddress[1] & 0xf0) == 16)) { // 172.16/12 121 return true; 122 } else if (((ipaddress[0] & 0xff) == 192) && ((ipaddress[1] & 0xff) == 168)) { // 192.168/16 123 return true; 124 } 125 return false; 126 } 127 writeReplace()128 private Object writeReplace() throws ObjectStreamException { 129 return new Inet4Address(ipaddress, hostName); 130 } 131 } 132