001 /* Inet4Address.java -- 002 Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc. 003 004 This file is part of GNU Classpath. 005 006 GNU Classpath is free software; you can redistribute it and/or modify 007 it under the terms of the GNU General Public License as published by 008 the Free Software Foundation; either version 2, or (at your option) 009 any later version. 010 011 GNU Classpath is distributed in the hope that it will be useful, but 012 WITHOUT ANY WARRANTY; without even the implied warranty of 013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 General Public License for more details. 015 016 You should have received a copy of the GNU General Public License 017 along with GNU Classpath; see the file COPYING. If not, write to the 018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 019 02110-1301 USA. 020 021 Linking this library statically or dynamically with other modules is 022 making a combined work based on this library. Thus, the terms and 023 conditions of the GNU General Public License cover the whole 024 combination. 025 026 As a special exception, the copyright holders of this library give you 027 permission to link this library with independent modules to produce an 028 executable, regardless of the license terms of these independent 029 modules, and to copy and distribute the resulting executable under 030 terms of your choice, provided that you also meet, for each linked 031 independent module, the terms and conditions of the license of that 032 module. An independent module is a module which is not derived from 033 or based on this library. If you modify this library, you may extend 034 this exception to your version of the library, but you are not 035 obligated to do so. If you do not wish to do so, delete this 036 exception statement from your version. */ 037 038 039 package java.net; 040 041 import java.io.ObjectStreamException; 042 043 /* 044 * Written using on-line Java Platform 1.4 API Specification and 045 * RFC 1884 (http://www.ietf.org/rfc/rfc1884.txt), 046 * RFC 1918 (http://www.ietf.org/rfc/rfc1918.txt), 047 * RFC 2365 (http://www.ietf.org/rfc/rfc2365.txt) 048 * 049 * @author Michael Koch 050 * @status Believed complete and correct. 051 */ 052 public final class Inet4Address extends InetAddress 053 { 054 /** 055 * For compatability with Sun's JDK 1.4.2 rev. 5 056 */ 057 static final long serialVersionUID = 3286316764910316507L; 058 059 /** 060 * The address family of these addresses (used for serialization). 061 */ 062 private static final int AF_INET = 2; 063 064 /** 065 * Inet4Address objects are serialized as InetAddress objects. 066 */ 067 private Object writeReplace() throws ObjectStreamException 068 { 069 return new InetAddress(addr, hostName, AF_INET); 070 } 071 072 /** 073 * Initializes this object's addr instance variable from the passed in 074 * byte array. Note that this constructor is protected and is called 075 * only by static methods in this class. 076 * 077 * @param addr The IP number of this address as an array of bytes 078 * @param host The hostname of this IP address. 079 */ 080 Inet4Address(byte[] addr, String host) 081 { 082 super(addr, host, AF_INET); 083 } 084 085 /** 086 * Checks if the address is a multicast address 087 * 088 * @since 1.1 089 */ 090 public boolean isMulticastAddress() 091 { 092 return (addr[0] & 0xf0) == 0xe0; 093 } 094 095 /** 096 * Checks if this address is a loopback address 097 */ 098 public boolean isLoopbackAddress() 099 { 100 return (addr[0] & 0xff) == 0x7f; 101 } 102 103 /** 104 * Checks if this address is a wildcard address 105 * 106 * @since 1.4 107 */ 108 public boolean isAnyLocalAddress() 109 { 110 return equals(InetAddress.ANY_IF); 111 } 112 113 /** 114 * Checks if this address is a link local address 115 * 116 * @since 1.4 117 */ 118 public boolean isLinkLocalAddress() 119 { 120 return false; 121 } 122 123 /** 124 * Checks if this address is a site local address 125 * 126 * @since 1.4 127 */ 128 public boolean isSiteLocalAddress() 129 { 130 // 10.0.0.0/8 131 if ((addr[0] & 0xff) == 0x0a) 132 return true; 133 134 // 172.16.0.0/12 135 if ((addr[0] & 0xff) == 0xac && (addr[1] & 0xf0) == 0x10) 136 return true; 137 138 // 192.168.0.0/16 139 if ((addr[0] & 0xff) == 0xc0 && (addr[1] & 0xff) == 0xa8) 140 return true; 141 142 return false; 143 } 144 145 /** 146 * Checks if this multicast address has global scope 147 * 148 * @since 1.4 149 */ 150 public boolean isMCGlobal() 151 { 152 return false; 153 } 154 155 /** 156 * Checks if this multicast address has node scope 157 * 158 * @since 1.4 159 */ 160 public boolean isMCNodeLocal() 161 { 162 return false; 163 } 164 165 /** 166 * Checks if this multicast address has link scope 167 * 168 * @since 1.4 169 */ 170 public boolean isMCLinkLocal() 171 { 172 if (! isMulticastAddress()) 173 return false; 174 175 return ((addr[0] & 0xff) == 0xe0 176 && (addr[1] & 0xff) == 0x00 177 && (addr[2] & 0xff) == 0x00); 178 } 179 180 /** 181 * Checks if this multicast address has site scope 182 * 183 * @since 1.4 184 */ 185 public boolean isMCSiteLocal() 186 { 187 return false; 188 } 189 190 /** 191 * Checks if this multicast address has organization scope 192 * 193 * @since 1.4 194 */ 195 public boolean isMCOrgLocal() 196 { 197 return false; 198 } 199 200 /** 201 * Returns the address of the current instance 202 */ 203 public byte[] getAddress() 204 { 205 return (byte[]) addr.clone(); 206 } 207 208 /** 209 * Returns the address as string 210 * 211 * @since 1.0.2 212 */ 213 public String getHostAddress() 214 { 215 StringBuffer sb = new StringBuffer(40); 216 217 int len = addr.length; 218 int i = 0; 219 220 for ( ; ; ) 221 { 222 sb.append(addr[i] & 0xff); 223 i++; 224 225 if (i == len) 226 break; 227 228 sb.append('.'); 229 } 230 231 return sb.toString(); 232 } 233 234 /** 235 * Computes the hashcode of the instance 236 */ 237 public int hashCode() 238 { 239 int hash = 0; 240 int len = addr.length; 241 int i = len > 4 ? len - 4 : 0; 242 243 for (; i < len; i++) 244 hash = (hash << 8) | (addr[i] & 0xFF); 245 246 return hash; 247 } 248 249 /** 250 * Compare the current Inet4Address instance with obj 251 * 252 * @param obj Object to compare with 253 */ 254 public boolean equals(Object obj) 255 { 256 if (! (obj instanceof InetAddress)) 257 return false; 258 259 byte[] addr1 = addr; 260 byte[] addr2 = ((InetAddress) obj).addr; 261 262 if (addr1.length != addr2.length) 263 return false; 264 265 for (int i = addr1.length; --i >= 0;) 266 if (addr1[i] != addr2[i]) 267 return false; 268 269 return true; 270 } 271 }