001 /*
002 * Copyright 2000-2006 Sun Microsystems, Inc. All Rights Reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation. Sun designates this
008 * particular file as subject to the "Classpath" exception as provided
009 * by Sun in the LICENSE file that accompanied this code.
010 *
011 * This code is distributed in the hope that it will be useful, but WITHOUT
012 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
014 * version 2 for more details (a copy is included in the LICENSE file that
015 * accompanied this code).
016 *
017 * You should have received a copy of the GNU General Public License version
018 * 2 along with this work; if not, write to the Free Software Foundation,
019 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020 *
021 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022 * CA 95054 USA or visit www.sun.com if you need additional information or
023 * have any questions.
024 */
025
026 package java.net;
027
028 import java.security.AccessController;
029 import java.io.ObjectStreamException;
030 import sun.security.action.*;
031
032 /**
033 * This class represents an Internet Protocol version 4 (IPv4) address.
034 * Defined by <a href="http://www.ietf.org/rfc/rfc790.txt">
035 * <i>RFC 790: Assigned Numbers</i></a>,
036 * <a href="http://www.ietf.org/rfc/rfc1918.txt">
037 * <i>RFC 1918: Address Allocation for Private Internets</i></a>,
038 * and <a href="http://www.ietf.org/rfc/rfc2365.txt"><i>RFC 2365:
039 * Administratively Scoped IP Multicast</i></a>
040 *
041 * <h4> <A NAME="format">Textual representation of IP addresses</a> </h4>
042 *
043 * Textual representation of IPv4 address used as input to methods
044 * takes one of the following forms:
045 *
046 * <blockquote><table cellpadding=0 cellspacing=0 summary="layout">
047 * <tr><td><tt>d.d.d.d</tt></td></tr>
048 * <tr><td><tt>d.d.d</tt></td></tr>
049 * <tr><td><tt>d.d</tt></td></tr>
050 * <tr><td><tt>d</tt></td></tr>
051 * </table></blockquote>
052 *
053 * <p> When four parts are specified, each is interpreted as a byte of
054 * data and assigned, from left to right, to the four bytes of an IPv4
055 * address.
056
057 * <p> When a three part address is specified, the last part is
058 * interpreted as a 16-bit quantity and placed in the right most two
059 * bytes of the network address. This makes the three part address
060 * format convenient for specifying Class B net- work addresses as
061 * 128.net.host.
062 *
063 * <p> When a two part address is supplied, the last part is
064 * interpreted as a 24-bit quantity and placed in the right most three
065 * bytes of the network address. This makes the two part address
066 * format convenient for specifying Class A network addresses as
067 * net.host.
068 *
069 * <p> When only one part is given, the value is stored directly in
070 * the network address without any byte rearrangement.
071 *
072 * <p> For methods that return a textual representation as output
073 * value, the first form, i.e. a dotted-quad string, is used.
074 *
075 * <h4> The Scope of a Multicast Address </h4>
076 *
077 * Historically the IPv4 TTL field in the IP header has doubled as a
078 * multicast scope field: a TTL of 0 means node-local, 1 means
079 * link-local, up through 32 means site-local, up through 64 means
080 * region-local, up through 128 means continent-local, and up through
081 * 255 are global. However, the administrative scoping is preferred.
082 * Please refer to <a href="http://www.ietf.org/rfc/rfc2365.txt">
083 * <i>RFC 2365: Administratively Scoped IP Multicast</i></a>
084 * @since 1.4
085 */
086
087 public final class Inet4Address extends InetAddress {
088 final static int INADDRSZ = 4;
089
090 /** use serialVersionUID from InetAddress, but Inet4Address instance
091 * is always replaced by an InetAddress instance before being
092 * serialized */
093 private static final long serialVersionUID = 3286316764910316507L;
094
095 /*
096 * Perform initializations.
097 */
098 static {
099 init();
100 }
101
102 Inet4Address() {
103 super ();
104 hostName = null;
105 address = 0;
106 family = IPv4;
107 }
108
109 Inet4Address(String hostName, byte addr[]) {
110 this .hostName = hostName;
111 this .family = IPv4;
112 if (addr != null) {
113 if (addr.length == INADDRSZ) {
114 address = addr[3] & 0xFF;
115 address |= ((addr[2] << 8) & 0xFF00);
116 address |= ((addr[1] << 16) & 0xFF0000);
117 address |= ((addr[0] << 24) & 0xFF000000);
118 }
119 }
120 }
121
122 Inet4Address(String hostName, int address) {
123 this .hostName = hostName;
124 this .family = IPv4;
125 this .address = address;
126 }
127
128 /**
129 * Replaces the object to be serialized with an InetAddress object.
130 *
131 * @return the alternate object to be serialized.
132 *
133 * @throws ObjectStreamException if a new object replacing this
134 * object could not be created
135 */
136 private Object writeReplace() throws ObjectStreamException {
137 // will replace the to be serialized 'this' object
138 InetAddress inet = new InetAddress();
139 inet.hostName = this .hostName;
140 inet.address = this .address;
141
142 /**
143 * Prior to 1.4 an InetAddress was created with a family
144 * based on the platform AF_INET value (usually 2).
145 * For compatibility reasons we must therefore write the
146 * the InetAddress with this family.
147 */
148 inet.family = 2;
149
150 return inet;
151 }
152
153 /**
154 * Utility routine to check if the InetAddress is an
155 * IP multicast address. IP multicast address is a Class D
156 * address i.e first four bits of the address are 1110.
157 * @return a <code>boolean</code> indicating if the InetAddress is
158 * an IP multicast address
159 * @since JDK1.1
160 */
161 public boolean isMulticastAddress() {
162 return ((address & 0xf0000000) == 0xe0000000);
163 }
164
165 /**
166 * Utility routine to check if the InetAddress in a wildcard address.
167 * @return a <code>boolean</code> indicating if the Inetaddress is
168 * a wildcard address.
169 * @since 1.4
170 */
171 public boolean isAnyLocalAddress() {
172 return address == 0;
173 }
174
175 /**
176 * Utility routine to check if the InetAddress is a loopback address.
177 *
178 * @return a <code>boolean</code> indicating if the InetAddress is
179 * a loopback address; or false otherwise.
180 * @since 1.4
181 */
182 private static final int loopback = 2130706433; /* 127.0.0.1 */
183
184 public boolean isLoopbackAddress() {
185 /* 127.x.x.x */
186 byte[] byteAddr = getAddress();
187 return byteAddr[0] == 127;
188 }
189
190 /**
191 * Utility routine to check if the InetAddress is an link local address.
192 *
193 * @return a <code>boolean</code> indicating if the InetAddress is
194 * a link local address; or false if address is not a link local unicast address.
195 * @since 1.4
196 */
197 public boolean isLinkLocalAddress() {
198 // link-local unicast in IPv4 (169.254.0.0/16)
199 // defined in "Documenting Special Use IPv4 Address Blocks
200 // that have been Registered with IANA" by Bill Manning
201 // draft-manning-dsua-06.txt
202 return (((address >>> 24) & 0xFF) == 169)
203 && (((address >>> 16) & 0xFF) == 254);
204 }
205
206 /**
207 * Utility routine to check if the InetAddress is a site local address.
208 *
209 * @return a <code>boolean</code> indicating if the InetAddress is
210 * a site local address; or false if address is not a site local unicast address.
211 * @since 1.4
212 */
213 public boolean isSiteLocalAddress() {
214 // refer to RFC 1918
215 // 10/8 prefix
216 // 172.16/12 prefix
217 // 192.168/16 prefix
218 return (((address >>> 24) & 0xFF) == 10)
219 || ((((address >>> 24) & 0xFF) == 172) && (((address >>> 16) & 0xF0) == 16))
220 || ((((address >>> 24) & 0xFF) == 192) && (((address >>> 16) & 0xFF) == 168));
221 }
222
223 /**
224 * Utility routine to check if the multicast address has global scope.
225 *
226 * @return a <code>boolean</code> indicating if the address has
227 * is a multicast address of global scope, false if it is not
228 * of global scope or it is not a multicast address
229 * @since 1.4
230 */
231 public boolean isMCGlobal() {
232 // 224.0.1.0 to 238.255.255.255
233 byte[] byteAddr = getAddress();
234 return ((byteAddr[0] & 0xff) >= 224 && (byteAddr[0] & 0xff) <= 238)
235 && !((byteAddr[0] & 0xff) == 224 && byteAddr[1] == 0 && byteAddr[2] == 0);
236 }
237
238 /**
239 * Utility routine to check if the multicast address has node scope.
240 *
241 * @return a <code>boolean</code> indicating if the address has
242 * is a multicast address of node-local scope, false if it is not
243 * of node-local scope or it is not a multicast address
244 * @since 1.4
245 */
246 public boolean isMCNodeLocal() {
247 // unless ttl == 0
248 return false;
249 }
250
251 /**
252 * Utility routine to check if the multicast address has link scope.
253 *
254 * @return a <code>boolean</code> indicating if the address has
255 * is a multicast address of link-local scope, false if it is not
256 * of link-local scope or it is not a multicast address
257 * @since 1.4
258 */
259 public boolean isMCLinkLocal() {
260 // 224.0.0/24 prefix and ttl == 1
261 return (((address >>> 24) & 0xFF) == 224)
262 && (((address >>> 16) & 0xFF) == 0)
263 && (((address >>> 8) & 0xFF) == 0);
264 }
265
266 /**
267 * Utility routine to check if the multicast address has site scope.
268 *
269 * @return a <code>boolean</code> indicating if the address has
270 * is a multicast address of site-local scope, false if it is not
271 * of site-local scope or it is not a multicast address
272 * @since 1.4
273 */
274 public boolean isMCSiteLocal() {
275 // 239.255/16 prefix or ttl < 32
276 return (((address >>> 24) & 0xFF) == 239)
277 && (((address >>> 16) & 0xFF) == 255);
278 }
279
280 /**
281 * Utility routine to check if the multicast address has organization scope.
282 *
283 * @return a <code>boolean</code> indicating if the address has
284 * is a multicast address of organization-local scope,
285 * false if it is not of organization-local scope
286 * or it is not a multicast address
287 * @since 1.4
288 */
289 public boolean isMCOrgLocal() {
290 // 239.192 - 239.195
291 return (((address >>> 24) & 0xFF) == 239)
292 && (((address >>> 16) & 0xFF) >= 192)
293 && (((address >>> 16) & 0xFF) <= 195);
294 }
295
296 /**
297 * Returns the raw IP address of this <code>InetAddress</code>
298 * object. The result is in network byte order: the highest order
299 * byte of the address is in <code>getAddress()[0]</code>.
300 *
301 * @return the raw IP address of this object.
302 */
303 public byte[] getAddress() {
304 byte[] addr = new byte[INADDRSZ];
305
306 addr[0] = (byte) ((address >>> 24) & 0xFF);
307 addr[1] = (byte) ((address >>> 16) & 0xFF);
308 addr[2] = (byte) ((address >>> 8) & 0xFF);
309 addr[3] = (byte) (address & 0xFF);
310 return addr;
311 }
312
313 /**
314 * Returns the IP address string in textual presentation form.
315 *
316 * @return the raw IP address in a string format.
317 * @since JDK1.0.2
318 */
319 public String getHostAddress() {
320 return numericToTextFormat(getAddress());
321 }
322
323 /**
324 * Returns a hashcode for this IP address.
325 *
326 * @return a hash code value for this IP address.
327 */
328 public int hashCode() {
329 return address;
330 }
331
332 /**
333 * Compares this object against the specified object.
334 * The result is <code>true</code> if and only if the argument is
335 * not <code>null</code> and it represents the same IP address as
336 * this object.
337 * <p>
338 * Two instances of <code>InetAddress</code> represent the same IP
339 * address if the length of the byte arrays returned by
340 * <code>getAddress</code> is the same for both, and each of the
341 * array components is the same for the byte arrays.
342 *
343 * @param obj the object to compare against.
344 * @return <code>true</code> if the objects are the same;
345 * <code>false</code> otherwise.
346 * @see java.net.InetAddress#getAddress()
347 */
348 public boolean equals(Object obj) {
349 return (obj != null) && (obj instanceof Inet4Address)
350 && (((InetAddress) obj).address == address);
351 }
352
353 // Utilities
354 /*
355 * Converts IPv4 binary address into a string suitable for presentation.
356 *
357 * @param src a byte array representing an IPv4 numeric address
358 * @return a String representing the IPv4 address in
359 * textual representation format
360 * @since 1.4
361 */
362
363 static String numericToTextFormat(byte[] src) {
364 return (src[0] & 0xff) + "." + (src[1] & 0xff) + "."
365 + (src[2] & 0xff) + "." + (src[3] & 0xff);
366 }
367
368 /**
369 * Perform class load-time initializations.
370 */
371 private static native void init();
372 }
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