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 }