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 gnu.java.lang.CPStringBuilder;
042
043 import java.io.ObjectStreamException;
044
045 /*
046 * Written using on-line Java Platform 1.4 API Specification and
047 * RFC 1884 (http://www.ietf.org/rfc/rfc1884.txt),
048 * RFC 1918 (http://www.ietf.org/rfc/rfc1918.txt),
049 * RFC 2365 (http://www.ietf.org/rfc/rfc2365.txt)
050 *
051 * @author Michael Koch
052 * @status Believed complete and correct.
053 */
054 public final class Inet4Address extends InetAddress
055 {
056 /**
057 * For compatability with Sun's JDK 1.4.2 rev. 5
058 */
059 static final long serialVersionUID = 3286316764910316507L;
060
061 /**
062 * The address family of these addresses (used for serialization).
063 */
064 private static final int AF_INET = 2;
065
066 /**
067 * Inet4Address objects are serialized as InetAddress objects.
068 */
069 private Object writeReplace() throws ObjectStreamException
070 {
071 return new InetAddress(addr, hostName, AF_INET);
072 }
073
074 /**
075 * Initializes this object's addr instance variable from the passed in
076 * byte array. Note that this constructor is protected and is called
077 * only by static methods in this class.
078 *
079 * @param addr The IP number of this address as an array of bytes
080 * @param host The hostname of this IP address.
081 */
082 Inet4Address(byte[] addr, String host)
083 {
084 super(addr, host, AF_INET);
085 }
086
087 /**
088 * Checks if the address is a multicast address
089 *
090 * @since 1.1
091 */
092 public boolean isMulticastAddress()
093 {
094 return (addr[0] & 0xf0) == 0xe0;
095 }
096
097 /**
098 * Checks if this address is a loopback address
099 */
100 public boolean isLoopbackAddress()
101 {
102 return (addr[0] & 0xff) == 0x7f;
103 }
104
105 /**
106 * Checks if this address is a wildcard address
107 *
108 * @since 1.4
109 */
110 public boolean isAnyLocalAddress()
111 {
112 return equals(InetAddress.ANY_IF);
113 }
114
115 /**
116 * Checks if this address is a link local address
117 *
118 * @since 1.4
119 */
120 public boolean isLinkLocalAddress()
121 {
122 return false;
123 }
124
125 /**
126 * Checks if this address is a site local address
127 *
128 * @since 1.4
129 */
130 public boolean isSiteLocalAddress()
131 {
132 // 10.0.0.0/8
133 if ((addr[0] & 0xff) == 0x0a)
134 return true;
135
136 // 172.16.0.0/12
137 if ((addr[0] & 0xff) == 0xac && (addr[1] & 0xf0) == 0x10)
138 return true;
139
140 // 192.168.0.0/16
141 if ((addr[0] & 0xff) == 0xc0 && (addr[1] & 0xff) == 0xa8)
142 return true;
143
144 return false;
145 }
146
147 /**
148 * Checks if this multicast address has global scope
149 *
150 * @since 1.4
151 */
152 public boolean isMCGlobal()
153 {
154 return false;
155 }
156
157 /**
158 * Checks if this multicast address has node scope
159 *
160 * @since 1.4
161 */
162 public boolean isMCNodeLocal()
163 {
164 return false;
165 }
166
167 /**
168 * Checks if this multicast address has link scope
169 *
170 * @since 1.4
171 */
172 public boolean isMCLinkLocal()
173 {
174 if (! isMulticastAddress())
175 return false;
176
177 return ((addr[0] & 0xff) == 0xe0
178 && (addr[1] & 0xff) == 0x00
179 && (addr[2] & 0xff) == 0x00);
180 }
181
182 /**
183 * Checks if this multicast address has site scope
184 *
185 * @since 1.4
186 */
187 public boolean isMCSiteLocal()
188 {
189 return false;
190 }
191
192 /**
193 * Checks if this multicast address has organization scope
194 *
195 * @since 1.4
196 */
197 public boolean isMCOrgLocal()
198 {
199 return false;
200 }
201
202 /**
203 * Returns the address of the current instance
204 */
205 public byte[] getAddress()
206 {
207 return (byte[]) addr.clone();
208 }
209
210 /**
211 * Returns the address as string
212 *
213 * @since 1.0.2
214 */
215 public String getHostAddress()
216 {
217 CPStringBuilder sb = new CPStringBuilder(40);
218
219 int len = addr.length;
220 int i = 0;
221
222 for ( ; ; )
223 {
224 sb.append(addr[i] & 0xff);
225 i++;
226
227 if (i == len)
228 break;
229
230 sb.append('.');
231 }
232
233 return sb.toString();
234 }
235
236 /**
237 * Computes the hashcode of the instance
238 */
239 public int hashCode()
240 {
241 int hash = 0;
242 int len = addr.length;
243 int i = len > 4 ? len - 4 : 0;
244
245 for (; i < len; i++)
246 hash = (hash << 8) | (addr[i] & 0xFF);
247
248 return hash;
249 }
250
251 /**
252 * Compare the current Inet4Address instance with obj
253 *
254 * @param obj Object to compare with
255 */
256 public boolean equals(Object obj)
257 {
258 if (! (obj instanceof InetAddress))
259 return false;
260
261 byte[] addr1 = addr;
262 byte[] addr2 = ((InetAddress) obj).addr;
263
264 if (addr1.length != addr2.length)
265 return false;
266
267 for (int i = addr1.length; --i >= 0;)
268 if (addr1[i] != addr2[i])
269 return false;
270
271 return true;
272 }
273 }