1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. Oracle designates this 9 * particular file as subject to the "Classpath" exception as provided 10 * by Oracle in the LICENSE file that accompanied this code. 11 * 12 * This code is distributed in the hope that it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15 * version 2 for more details (a copy is included in the LICENSE file that 16 * accompanied this code). 17 * 18 * You should have received a copy of the GNU General Public License version 19 * 2 along with this work; if not, write to the Free Software Foundation, 20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 21 * 22 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 23 * or visit www.oracle.com if you need additional information or have any 24 * questions. 25 */ 26 27 package java.net; 28 29 import java.io.IOException; 30 import java.io.InvalidObjectException; 31 import java.io.ObjectInputStream; 32 import java.io.ObjectOutputStream; 33 import java.io.ObjectStreamField; 34 import java.util.Enumeration; 35 import java.util.Arrays; 36 import libcore.io.Libcore; 37 import static android.system.OsConstants.*; 38 39 /** 40 * This class represents an Internet Protocol version 6 (IPv6) address. 41 * Defined by <a href="http://www.ietf.org/rfc/rfc2373.txt"> 42 * <i>RFC 2373: IP Version 6 Addressing Architecture</i></a>. 43 * 44 * <h3> <A NAME="format">Textual representation of IP addresses</a> </h3> 45 * 46 * Textual representation of IPv6 address used as input to methods 47 * takes one of the following forms: 48 * 49 * <ol> 50 * <li><p> <A NAME="lform">The preferred form</a> is x:x:x:x:x:x:x:x, 51 * where the 'x's are 52 * the hexadecimal values of the eight 16-bit pieces of the 53 * address. This is the full form. For example, 54 * 55 * <blockquote><table cellpadding=0 cellspacing=0 summary="layout"> 56 * <tr><td>{@code 1080:0:0:0:8:800:200C:417A}<td></tr> 57 * </table></blockquote> 58 * 59 * <p> Note that it is not necessary to write the leading zeros in 60 * an individual field. However, there must be at least one numeral 61 * in every field, except as described below.</li> 62 * 63 * <li><p> Due to some methods of allocating certain styles of IPv6 64 * addresses, it will be common for addresses to contain long 65 * strings of zero bits. In order to make writing addresses 66 * containing zero bits easier, a special syntax is available to 67 * compress the zeros. The use of "::" indicates multiple groups 68 * of 16-bits of zeros. The "::" can only appear once in an address. 69 * The "::" can also be used to compress the leading and/or trailing 70 * zeros in an address. For example, 71 * 72 * <blockquote><table cellpadding=0 cellspacing=0 summary="layout"> 73 * <tr><td>{@code 1080::8:800:200C:417A}<td></tr> 74 * </table></blockquote> 75 * 76 * <li><p> An alternative form that is sometimes more convenient 77 * when dealing with a mixed environment of IPv4 and IPv6 nodes is 78 * x:x:x:x:x:x:d.d.d.d, where the 'x's are the hexadecimal values 79 * of the six high-order 16-bit pieces of the address, and the 'd's 80 * are the decimal values of the four low-order 8-bit pieces of the 81 * standard IPv4 representation address, for example, 82 * 83 * <blockquote><table cellpadding=0 cellspacing=0 summary="layout"> 84 * <tr><td>{@code ::FFFF:129.144.52.38}<td></tr> 85 * <tr><td>{@code ::129.144.52.38}<td></tr> 86 * </table></blockquote> 87 * 88 * <p> where "::FFFF:d.d.d.d" and "::d.d.d.d" are, respectively, the 89 * general forms of an IPv4-mapped IPv6 address and an 90 * IPv4-compatible IPv6 address. Note that the IPv4 portion must be 91 * in the "d.d.d.d" form. The following forms are invalid: 92 * 93 * <blockquote><table cellpadding=0 cellspacing=0 summary="layout"> 94 * <tr><td>{@code ::FFFF:d.d.d}<td></tr> 95 * <tr><td>{@code ::FFFF:d.d}<td></tr> 96 * <tr><td>{@code ::d.d.d}<td></tr> 97 * <tr><td>{@code ::d.d}<td></tr> 98 * </table></blockquote> 99 * 100 * <p> The following form: 101 * 102 * <blockquote><table cellpadding=0 cellspacing=0 summary="layout"> 103 * <tr><td>{@code ::FFFF:d}<td></tr> 104 * </table></blockquote> 105 * 106 * <p> is valid, however it is an unconventional representation of 107 * the IPv4-compatible IPv6 address, 108 * 109 * <blockquote><table cellpadding=0 cellspacing=0 summary="layout"> 110 * <tr><td>{@code ::255.255.0.d}<td></tr> 111 * </table></blockquote> 112 * 113 * <p> while "::d" corresponds to the general IPv6 address 114 * "0:0:0:0:0:0:0:d".</li> 115 * </ol> 116 * 117 * <p> For methods that return a textual representation as output 118 * value, the full form is used. Inet6Address will return the full 119 * form because it is unambiguous when used in combination with other 120 * textual data. 121 * 122 * <h4> Special IPv6 address </h4> 123 * 124 * <blockquote> 125 * <table cellspacing=2 summary="Description of IPv4-mapped address"> 126 * <tr><th valign=top><i>IPv4-mapped address</i></th> 127 * <td>Of the form::ffff:w.x.y.z, this IPv6 address is used to 128 * represent an IPv4 address. It allows the native program to 129 * use the same address data structure and also the same 130 * socket when communicating with both IPv4 and IPv6 nodes. 131 * 132 * <p>In InetAddress and Inet6Address, it is used for internal 133 * representation; it has no functional role. Java will never 134 * return an IPv4-mapped address. These classes can take an 135 * IPv4-mapped address as input, both in byte array and text 136 * representation. However, it will be converted into an IPv4 137 * address.</td></tr> 138 * </table></blockquote> 139 * 140 * <h4><A NAME="scoped">Textual representation of IPv6 scoped addresses</a></h4> 141 * 142 * <p> The textual representation of IPv6 addresses as described above can be 143 * extended to specify IPv6 scoped addresses. This extension to the basic 144 * addressing architecture is described in [draft-ietf-ipngwg-scoping-arch-04.txt]. 145 * 146 * <p> Because link-local and site-local addresses are non-global, it is possible 147 * that different hosts may have the same destination address and may be 148 * reachable through different interfaces on the same originating system. In 149 * this case, the originating system is said to be connected to multiple zones 150 * of the same scope. In order to disambiguate which is the intended destination 151 * zone, it is possible to append a zone identifier (or <i>scope_id</i>) to an 152 * IPv6 address. 153 * 154 * <p> The general format for specifying the <i>scope_id</i> is the following: 155 * 156 * <blockquote><i>IPv6-address</i>%<i>scope_id</i></blockquote> 157 * <p> The IPv6-address is a literal IPv6 address as described above. 158 * The <i>scope_id</i> refers to an interface on the local system, and it can be 159 * specified in two ways. 160 * <ol><li><i>As a numeric identifier.</i> This must be a positive integer 161 * that identifies the particular interface and scope as understood by the 162 * system. Usually, the numeric values can be determined through administration 163 * tools on the system. Each interface may have multiple values, one for each 164 * scope. If the scope is unspecified, then the default value used is zero.</li> 165 * <li><i>As a string.</i> This must be the exact string that is returned by 166 * {@link java.net.NetworkInterface#getName()} for the particular interface in 167 * question. When an Inet6Address is created in this way, the numeric scope-id 168 * is determined at the time the object is created by querying the relevant 169 * NetworkInterface.</li></ol> 170 * 171 * <p> Note also, that the numeric <i>scope_id</i> can be retrieved from 172 * Inet6Address instances returned from the NetworkInterface class. This can be 173 * used to find out the current scope ids configured on the system. 174 * @since 1.4 175 */ 176 177 public final 178 class Inet6Address extends InetAddress { 179 final static int INADDRSZ = 16; 180 181 /** @hide */ 182 public static final InetAddress ANY = 183 new Inet6Address("::", new byte[] {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0); 184 185 /** @hide */ 186 public static final InetAddress LOOPBACK = new Inet6Address("ip6-localhost", 187 new byte[] {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}, 0); 188 189 private class Inet6AddressHolder { 190 Inet6AddressHolder()191 private Inet6AddressHolder() { 192 ipaddress = new byte[INADDRSZ]; 193 } 194 Inet6AddressHolder( byte[] ipaddress, int scope_id, boolean scope_id_set, NetworkInterface ifname, boolean scope_ifname_set)195 private Inet6AddressHolder( 196 byte[] ipaddress, int scope_id, boolean scope_id_set, 197 NetworkInterface ifname, boolean scope_ifname_set) 198 { 199 this.ipaddress = ipaddress; 200 this.scope_id = scope_id; 201 this.scope_id_set = scope_id_set; 202 this.scope_ifname_set = scope_ifname_set; 203 this.scope_ifname = ifname; 204 } 205 206 /** 207 * Holds a 128-bit (16 bytes) IPv6 address. 208 */ 209 byte[] ipaddress; 210 211 /** 212 * scope_id. The scope specified when the object is created. If the object 213 * is created with an interface name, then the scope_id is not determined 214 * until the time it is needed. 215 */ 216 int scope_id; // 0 217 218 /** 219 * This will be set to true when the scope_id field contains a valid 220 * integer scope_id. 221 */ 222 boolean scope_id_set; // false 223 224 /** 225 * scoped interface. scope_id is derived from this as the scope_id of the first 226 * address whose scope is the same as this address for the named interface. 227 */ 228 NetworkInterface scope_ifname; // null 229 230 /** 231 * set if the object is constructed with a scoped 232 * interface instead of a numeric scope id. 233 */ 234 boolean scope_ifname_set; // false; 235 setAddr(byte addr[])236 void setAddr(byte addr[]) { 237 if (addr.length == INADDRSZ) { // normal IPv6 address 238 System.arraycopy(addr, 0, ipaddress, 0, INADDRSZ); 239 } 240 } 241 init(byte addr[], int scope_id)242 void init(byte addr[], int scope_id) { 243 setAddr(addr); 244 245 // Android-changed: was >= 0 246 if (scope_id > 0) { 247 this.scope_id = scope_id; 248 this.scope_id_set = true; 249 } 250 } 251 init(byte addr[], NetworkInterface nif)252 void init(byte addr[], NetworkInterface nif) 253 throws UnknownHostException 254 { 255 setAddr(addr); 256 257 if (nif != null) { 258 this.scope_id = deriveNumericScope(ipaddress, nif); 259 this.scope_id_set = true; 260 this.scope_ifname = nif; 261 this.scope_ifname_set = true; 262 } 263 } 264 265 /* ----- Android-removed ----- 266 String getHostAddress() { 267 String s = numericToTextFormat(ipaddress); 268 if (scope_ifname != null) { // must check this first 269 s = s + "%" + scope_ifname.getName(); 270 } else if (scope_id_set) { 271 s = s + "%" + scope_id; 272 } 273 return s; 274 } */ 275 equals(Object o)276 public boolean equals(Object o) { 277 if (! (o instanceof Inet6AddressHolder)) { 278 return false; 279 } 280 Inet6AddressHolder that = (Inet6AddressHolder)o; 281 282 return Arrays.equals(this.ipaddress, that.ipaddress); 283 } 284 hashCode()285 public int hashCode() { 286 if (ipaddress != null) { 287 288 int hash = 0; 289 int i=0; 290 while (i<INADDRSZ) { 291 int j=0; 292 int component=0; 293 while (j<4 && i<INADDRSZ) { 294 component = (component << 8) + ipaddress[i]; 295 j++; 296 i++; 297 } 298 hash += component; 299 } 300 return hash; 301 302 } else { 303 return 0; 304 } 305 } 306 isIPv4CompatibleAddress()307 boolean isIPv4CompatibleAddress() { 308 if ((ipaddress[0] == 0x00) && (ipaddress[1] == 0x00) && 309 (ipaddress[2] == 0x00) && (ipaddress[3] == 0x00) && 310 (ipaddress[4] == 0x00) && (ipaddress[5] == 0x00) && 311 (ipaddress[6] == 0x00) && (ipaddress[7] == 0x00) && 312 (ipaddress[8] == 0x00) && (ipaddress[9] == 0x00) && 313 (ipaddress[10] == 0x00) && (ipaddress[11] == 0x00)) { 314 return true; 315 } 316 return false; 317 } 318 isMulticastAddress()319 boolean isMulticastAddress() { 320 return ((ipaddress[0] & 0xff) == 0xff); 321 } 322 isAnyLocalAddress()323 boolean isAnyLocalAddress() { 324 byte test = 0x00; 325 for (int i = 0; i < INADDRSZ; i++) { 326 test |= ipaddress[i]; 327 } 328 return (test == 0x00); 329 } 330 isLoopbackAddress()331 boolean isLoopbackAddress() { 332 byte test = 0x00; 333 for (int i = 0; i < 15; i++) { 334 test |= ipaddress[i]; 335 } 336 return (test == 0x00) && (ipaddress[15] == 0x01); 337 } 338 isLinkLocalAddress()339 boolean isLinkLocalAddress() { 340 return ((ipaddress[0] & 0xff) == 0xfe 341 && (ipaddress[1] & 0xc0) == 0x80); 342 } 343 344 isSiteLocalAddress()345 boolean isSiteLocalAddress() { 346 return ((ipaddress[0] & 0xff) == 0xfe 347 && (ipaddress[1] & 0xc0) == 0xc0); 348 } 349 isMCGlobal()350 boolean isMCGlobal() { 351 return ((ipaddress[0] & 0xff) == 0xff 352 && (ipaddress[1] & 0x0f) == 0x0e); 353 } 354 isMCNodeLocal()355 boolean isMCNodeLocal() { 356 return ((ipaddress[0] & 0xff) == 0xff 357 && (ipaddress[1] & 0x0f) == 0x01); 358 } 359 isMCLinkLocal()360 boolean isMCLinkLocal() { 361 return ((ipaddress[0] & 0xff) == 0xff 362 && (ipaddress[1] & 0x0f) == 0x02); 363 } 364 isMCSiteLocal()365 boolean isMCSiteLocal() { 366 return ((ipaddress[0] & 0xff) == 0xff 367 && (ipaddress[1] & 0x0f) == 0x05); 368 } 369 isMCOrgLocal()370 boolean isMCOrgLocal() { 371 return ((ipaddress[0] & 0xff) == 0xff 372 && (ipaddress[1] & 0x0f) == 0x08); 373 } 374 } 375 376 private final transient Inet6AddressHolder holder6; 377 378 private static final long serialVersionUID = 6880410070516793377L; 379 Inet6Address()380 Inet6Address() { 381 super(); 382 holder.init(null, AF_INET6); 383 holder6 = new Inet6AddressHolder(); 384 } 385 386 /* checking of value for scope_id should be done by caller 387 * scope_id must be >= 0, or -1 to indicate not being set 388 */ Inet6Address(String hostName, byte addr[], int scope_id)389 Inet6Address(String hostName, byte addr[], int scope_id) { 390 holder.init(hostName, AF_INET6); 391 holder6 = new Inet6AddressHolder(); 392 holder6.init(addr, scope_id); 393 } 394 Inet6Address(String hostName, byte addr[])395 Inet6Address(String hostName, byte addr[]) { 396 holder6 = new Inet6AddressHolder(); 397 try { 398 initif (hostName, addr, null); 399 } catch (UnknownHostException e) {} /* cant happen if ifname is null */ 400 } 401 Inet6Address(String hostName, byte addr[], NetworkInterface nif)402 Inet6Address (String hostName, byte addr[], NetworkInterface nif) throws UnknownHostException { 403 holder6 = new Inet6AddressHolder(); 404 initif (hostName, addr, nif); 405 } 406 Inet6Address(String hostName, byte addr[], String ifname)407 Inet6Address (String hostName, byte addr[], String ifname) throws UnknownHostException { 408 holder6 = new Inet6AddressHolder(); 409 initstr (hostName, addr, ifname); 410 } 411 412 /** 413 * Create an Inet6Address in the exact manner of {@link 414 * InetAddress#getByAddress(String,byte[])} except that the IPv6 scope_id is 415 * set to the value corresponding to the given interface for the address 416 * type specified in {@code addr}. The call will fail with an 417 * UnknownHostException if the given interface does not have a numeric 418 * scope_id assigned for the given address type (eg. link-local or site-local). 419 * See <a href="Inet6Address.html#scoped">here</a> for a description of IPv6 420 * scoped addresses. 421 * 422 * @param host the specified host 423 * @param addr the raw IP address in network byte order 424 * @param nif an interface this address must be associated with. 425 * @return an Inet6Address object created from the raw IP address. 426 * @throws UnknownHostException 427 * if IP address is of illegal length, or if the interface does not 428 * have a numeric scope_id assigned for the given address type. 429 * 430 * @since 1.5 431 */ getByAddress(String host, byte[] addr, NetworkInterface nif)432 public static Inet6Address getByAddress(String host, byte[] addr, 433 NetworkInterface nif) 434 throws UnknownHostException 435 { 436 if (host != null && host.length() > 0 && host.charAt(0) == '[') { 437 if (host.charAt(host.length()-1) == ']') { 438 host = host.substring(1, host.length() -1); 439 } 440 } 441 if (addr != null) { 442 if (addr.length == Inet6Address.INADDRSZ) { 443 return new Inet6Address(host, addr, nif); 444 } 445 } 446 throw new UnknownHostException("addr is of illegal length"); 447 } 448 449 /** 450 * Create an Inet6Address in the exact manner of {@link 451 * InetAddress#getByAddress(String,byte[])} except that the IPv6 scope_id is 452 * set to the given numeric value. The scope_id is not checked to determine 453 * if it corresponds to any interface on the system. 454 * See <a href="Inet6Address.html#scoped">here</a> for a description of IPv6 455 * scoped addresses. 456 * 457 * @param host the specified host 458 * @param addr the raw IP address in network byte order 459 * @param scope_id the numeric scope_id for the address. 460 * @return an Inet6Address object created from the raw IP address. 461 * @throws UnknownHostException if IP address is of illegal length. 462 * 463 * @since 1.5 464 */ getByAddress(String host, byte[] addr, int scope_id)465 public static Inet6Address getByAddress(String host, byte[] addr, 466 int scope_id) 467 throws UnknownHostException 468 { 469 if (host != null && host.length() > 0 && host.charAt(0) == '[') { 470 if (host.charAt(host.length()-1) == ']') { 471 host = host.substring(1, host.length() -1); 472 } 473 } 474 if (addr != null) { 475 if (addr.length == Inet6Address.INADDRSZ) { 476 return new Inet6Address(host, addr, scope_id); 477 } 478 } 479 throw new UnknownHostException("addr is of illegal length"); 480 } 481 initstr(String hostName, byte addr[], String ifname)482 private void initstr(String hostName, byte addr[], String ifname) 483 throws UnknownHostException 484 { 485 try { 486 NetworkInterface nif = NetworkInterface.getByName (ifname); 487 if (nif == null) { 488 throw new UnknownHostException ("no such interface " + ifname); 489 } 490 initif (hostName, addr, nif); 491 } catch (SocketException e) { 492 throw new UnknownHostException ("SocketException thrown" + ifname); 493 } 494 } 495 initif(String hostName, byte addr[],NetworkInterface nif)496 private void initif(String hostName, byte addr[],NetworkInterface nif) throws UnknownHostException { 497 holder().hostName = hostName; 498 int family = -1; 499 holder6.init(addr, nif); 500 501 if (addr.length == INADDRSZ) { // normal IPv6 address 502 family = AF_INET6; 503 } 504 holder.init(hostName, family); 505 } 506 507 /* check the two Ipv6 addresses and return false if they are both 508 * non global address types, but not the same. 509 * (ie. one is sitelocal and the other linklocal) 510 * return true otherwise. 511 */ 512 isDifferentLocalAddressType( byte[] thisAddr, byte[] otherAddr)513 private static boolean isDifferentLocalAddressType( 514 byte[] thisAddr, byte[] otherAddr) { 515 516 if (Inet6Address.isLinkLocalAddress(thisAddr) && 517 !Inet6Address.isLinkLocalAddress(otherAddr)) { 518 return false; 519 } 520 if (Inet6Address.isSiteLocalAddress(thisAddr) && 521 !Inet6Address.isSiteLocalAddress(otherAddr)) { 522 return false; 523 } 524 return true; 525 } 526 deriveNumericScope(byte[] thisAddr, NetworkInterface ifc)527 private static int deriveNumericScope (byte[] thisAddr, NetworkInterface ifc) throws UnknownHostException { 528 Enumeration<InetAddress> addresses = ifc.getInetAddresses(); 529 while (addresses.hasMoreElements()) { 530 InetAddress addr = addresses.nextElement(); 531 if (!(addr instanceof Inet6Address)) { 532 continue; 533 } 534 Inet6Address ia6_addr = (Inet6Address)addr; 535 /* check if site or link local prefixes match */ 536 if (!isDifferentLocalAddressType(thisAddr, ia6_addr.getAddress())){ 537 /* type not the same, so carry on searching */ 538 continue; 539 } 540 /* found a matching address - return its scope_id */ 541 return ia6_addr.getScopeId(); 542 } 543 throw new UnknownHostException ("no scope_id found"); 544 } 545 deriveNumericScope(String ifname)546 private int deriveNumericScope (String ifname) throws UnknownHostException { 547 Enumeration<NetworkInterface> en; 548 try { 549 en = NetworkInterface.getNetworkInterfaces(); 550 } catch (SocketException e) { 551 throw new UnknownHostException ("could not enumerate local network interfaces"); 552 } 553 while (en.hasMoreElements()) { 554 NetworkInterface ifc = en.nextElement(); 555 if (ifc.getName().equals (ifname)) { 556 return deriveNumericScope(holder6.ipaddress, ifc); 557 } 558 } 559 throw new UnknownHostException ("No matching address found for interface : " +ifname); 560 } 561 562 /** 563 * @serialField ipaddress byte[] 564 * @serialField scope_id int 565 * @serialField scope_id_set boolean 566 * @serialField scope_ifname_set boolean 567 * @serialField ifname String 568 */ 569 570 private static final ObjectStreamField[] serialPersistentFields = { 571 new ObjectStreamField("ipaddress", byte[].class), 572 new ObjectStreamField("scope_id", int.class), 573 new ObjectStreamField("scope_id_set", boolean.class), 574 new ObjectStreamField("scope_ifname_set", boolean.class), 575 new ObjectStreamField("ifname", String.class) 576 }; 577 578 private static final long FIELDS_OFFSET; 579 private static final sun.misc.Unsafe UNSAFE; 580 581 static { 582 try { 583 sun.misc.Unsafe unsafe = sun.misc.Unsafe.getUnsafe(); 584 FIELDS_OFFSET = unsafe.objectFieldOffset( 585 Inet6Address.class.getDeclaredField("holder6")); 586 UNSAFE = unsafe; 587 } catch (ReflectiveOperationException e) { 588 throw new Error(e); 589 } 590 } 591 592 /** 593 * restore the state of this object from stream 594 * including the scope information, only if the 595 * scoped interface name is valid on this system 596 */ readObject(ObjectInputStream s)597 private void readObject(ObjectInputStream s) 598 throws IOException, ClassNotFoundException { 599 NetworkInterface scope_ifname = null; 600 601 // Android-changed: was getClass().getClassLoader() != null 602 if (getClass().getClassLoader() != Class.class.getClassLoader()) { 603 throw new SecurityException ("invalid address type"); 604 } 605 606 ObjectInputStream.GetField gf = s.readFields(); 607 byte[] ipaddress = (byte[])gf.get("ipaddress", null); 608 int scope_id = (int)gf.get("scope_id", -1); 609 boolean scope_id_set = (boolean)gf.get("scope_id_set", false); 610 boolean scope_ifname_set = (boolean)gf.get("scope_ifname_set", false); 611 String ifname = (String)gf.get("ifname", null); 612 613 if (ifname != null && !"".equals (ifname)) { 614 try { 615 scope_ifname = NetworkInterface.getByName(ifname); 616 if (scope_ifname == null) { 617 /* the interface does not exist on this system, so we clear 618 * the scope information completely */ 619 scope_id_set = false; 620 scope_ifname_set = false; 621 scope_id = 0; 622 } else { 623 scope_ifname_set = true; 624 try { 625 scope_id = deriveNumericScope (ipaddress, scope_ifname); 626 } catch (UnknownHostException e) { 627 // typically should not happen, but it may be that 628 // the machine being used for deserialization has 629 // the same interface name but without IPv6 configured. 630 } 631 } 632 } catch (SocketException e) {} 633 } 634 635 /* if ifname was not supplied, then the numeric info is used */ 636 637 ipaddress = ipaddress.clone(); 638 639 // Check that our invariants are satisfied 640 if (ipaddress.length != INADDRSZ) { 641 throw new InvalidObjectException("invalid address length: "+ 642 ipaddress.length); 643 } 644 645 if (holder().getFamily() != AF_INET6) { 646 throw new InvalidObjectException("invalid address family type"); 647 } 648 649 Inet6AddressHolder h = new Inet6AddressHolder( 650 ipaddress, scope_id, scope_id_set, scope_ifname, scope_ifname_set 651 ); 652 653 UNSAFE.putObject(this, FIELDS_OFFSET, h); 654 } 655 656 /** 657 * default behavior is overridden in order to write the 658 * scope_ifname field as a String, rather than a NetworkInterface 659 * which is not serializable 660 */ writeObject(ObjectOutputStream s)661 private synchronized void writeObject(ObjectOutputStream s) 662 throws IOException 663 { 664 String ifname = null; 665 666 if (holder6.scope_ifname != null) { 667 ifname = holder6.scope_ifname.getName(); 668 holder6.scope_ifname_set = true; 669 } 670 ObjectOutputStream.PutField pfields = s.putFields(); 671 pfields.put("ipaddress", holder6.ipaddress); 672 pfields.put("scope_id", holder6.scope_id); 673 pfields.put("scope_id_set", holder6.scope_id_set); 674 pfields.put("scope_ifname_set", holder6.scope_ifname_set); 675 pfields.put("ifname", ifname); 676 s.writeFields(); 677 } 678 679 /** 680 * Utility routine to check if the InetAddress is an IP multicast 681 * address. 11111111 at the start of the address identifies the 682 * address as being a multicast address. 683 * 684 * @return a {@code boolean} indicating if the InetAddress is an IP 685 * multicast address 686 * 687 * @since JDK1.1 688 */ 689 @Override isMulticastAddress()690 public boolean isMulticastAddress() { 691 return holder6.isMulticastAddress(); 692 } 693 694 /** 695 * Utility routine to check if the InetAddress in a wildcard address. 696 * 697 * @return a {@code boolean} indicating if the Inetaddress is 698 * a wildcard address. 699 * 700 * @since 1.4 701 */ 702 @Override isAnyLocalAddress()703 public boolean isAnyLocalAddress() { 704 return holder6.isAnyLocalAddress(); 705 } 706 707 /** 708 * Utility routine to check if the InetAddress is a loopback address. 709 * 710 * @return a {@code boolean} indicating if the InetAddress is a loopback 711 * address; or false otherwise. 712 * 713 * @since 1.4 714 */ 715 @Override isLoopbackAddress()716 public boolean isLoopbackAddress() { 717 return holder6.isLoopbackAddress(); 718 } 719 720 /** 721 * Utility routine to check if the InetAddress is an link local address. 722 * 723 * @return a {@code boolean} indicating if the InetAddress is a link local 724 * address; or false if address is not a link local unicast address. 725 * 726 * @since 1.4 727 */ 728 @Override isLinkLocalAddress()729 public boolean isLinkLocalAddress() { 730 return holder6.isLinkLocalAddress(); 731 } 732 733 /* static version of above */ isLinkLocalAddress(byte[] ipaddress)734 static boolean isLinkLocalAddress(byte[] ipaddress) { 735 return ((ipaddress[0] & 0xff) == 0xfe 736 && (ipaddress[1] & 0xc0) == 0x80); 737 } 738 739 /** 740 * Utility routine to check if the InetAddress is a site local address. 741 * 742 * @return a {@code boolean} indicating if the InetAddress is a site local 743 * address; or false if address is not a site local unicast address. 744 * 745 * @since 1.4 746 */ 747 @Override isSiteLocalAddress()748 public boolean isSiteLocalAddress() { 749 return holder6.isSiteLocalAddress(); 750 } 751 752 /* static version of above */ isSiteLocalAddress(byte[] ipaddress)753 static boolean isSiteLocalAddress(byte[] ipaddress) { 754 return ((ipaddress[0] & 0xff) == 0xfe 755 && (ipaddress[1] & 0xc0) == 0xc0); 756 } 757 758 /** 759 * Utility routine to check if the multicast address has global scope. 760 * 761 * @return a {@code boolean} indicating if the address has is a multicast 762 * address of global scope, false if it is not of global scope or 763 * it is not a multicast address 764 * 765 * @since 1.4 766 */ 767 @Override isMCGlobal()768 public boolean isMCGlobal() { 769 return holder6.isMCGlobal(); 770 } 771 772 /** 773 * Utility routine to check if the multicast address has node scope. 774 * 775 * @return a {@code boolean} indicating if the address has is a multicast 776 * address of node-local scope, false if it is not of node-local 777 * scope or it is not a multicast address 778 * 779 * @since 1.4 780 */ 781 @Override isMCNodeLocal()782 public boolean isMCNodeLocal() { 783 return holder6.isMCNodeLocal(); 784 } 785 786 /** 787 * Utility routine to check if the multicast address has link scope. 788 * 789 * @return a {@code boolean} indicating if the address has is a multicast 790 * address of link-local scope, false if it is not of link-local 791 * scope or it is not a multicast address 792 * 793 * @since 1.4 794 */ 795 @Override isMCLinkLocal()796 public boolean isMCLinkLocal() { 797 return holder6.isMCLinkLocal(); 798 } 799 800 /** 801 * Utility routine to check if the multicast address has site scope. 802 * 803 * @return a {@code boolean} indicating if the address has is a multicast 804 * address of site-local scope, false if it is not of site-local 805 * scope or it is not a multicast address 806 * 807 * @since 1.4 808 */ 809 @Override isMCSiteLocal()810 public boolean isMCSiteLocal() { 811 return holder6.isMCSiteLocal(); 812 } 813 814 /** 815 * Utility routine to check if the multicast address has organization scope. 816 * 817 * @return a {@code boolean} indicating if the address has is a multicast 818 * address of organization-local scope, false if it is not of 819 * organization-local scope or it is not a multicast address 820 * 821 * @since 1.4 822 */ 823 @Override isMCOrgLocal()824 public boolean isMCOrgLocal() { 825 return holder6.isMCOrgLocal(); 826 } 827 /** 828 * Returns the raw IP address of this {@code InetAddress} object. The result 829 * is in network byte order: the highest order byte of the address is in 830 * {@code getAddress()[0]}. 831 * 832 * @return the raw IP address of this object. 833 */ 834 @Override getAddress()835 public byte[] getAddress() { 836 return holder6.ipaddress.clone(); 837 } 838 839 /** 840 * Returns the numeric scopeId, if this instance is associated with 841 * an interface. If no scoped_id is set, the returned value is zero. 842 * 843 * @return the scopeId, or zero if not set. 844 * 845 * @since 1.5 846 */ getScopeId()847 public int getScopeId() { 848 return holder6.scope_id; 849 } 850 851 /** 852 * Returns the scoped interface, if this instance was created with 853 * with a scoped interface. 854 * 855 * @return the scoped interface, or null if not set. 856 * @since 1.5 857 */ getScopedInterface()858 public NetworkInterface getScopedInterface() { 859 return holder6.scope_ifname; 860 } 861 862 /** 863 * Returns the IP address string in textual presentation. If the instance 864 * was created specifying a scope identifier then the scope id is appended 865 * to the IP address preceded by a "%" (per-cent) character. This can be 866 * either a numeric value or a string, depending on which was used to create 867 * the instance. 868 * 869 * @return the raw IP address in a string format. 870 */ 871 @Override getHostAddress()872 public String getHostAddress() { 873 // Android-changed: getnameinfo returns smarter representations 874 // return holder6.getHostAddress(); 875 return Libcore.os.getnameinfo(this, NI_NUMERICHOST); // Can't throw. 876 } 877 878 /** 879 * Returns a hashcode for this IP address. 880 * 881 * @return a hash code value for this IP address. 882 */ 883 @Override hashCode()884 public int hashCode() { 885 return holder6.hashCode(); 886 } 887 888 /** 889 * Compares this object against the specified object. The result is {@code 890 * true} if and only if the argument is not {@code null} and it represents 891 * the same IP address as this object. 892 * 893 * <p> Two instances of {@code InetAddress} represent the same IP address 894 * if the length of the byte arrays returned by {@code getAddress} is the 895 * same for both, and each of the array components is the same for the byte 896 * arrays. 897 * 898 * @param obj the object to compare against. 899 * 900 * @return {@code true} if the objects are the same; {@code false} otherwise. 901 * 902 * @see java.net.InetAddress#getAddress() 903 */ 904 @Override equals(Object obj)905 public boolean equals(Object obj) { 906 if (obj == null || !(obj instanceof Inet6Address)) 907 return false; 908 909 Inet6Address inetAddr = (Inet6Address)obj; 910 911 return holder6.equals(inetAddr.holder6); 912 } 913 914 /** 915 * Utility routine to check if the InetAddress is an 916 * IPv4 compatible IPv6 address. 917 * 918 * @return a {@code boolean} indicating if the InetAddress is an IPv4 919 * compatible IPv6 address; or false if address is IPv4 address. 920 * 921 * @since 1.4 922 */ isIPv4CompatibleAddress()923 public boolean isIPv4CompatibleAddress() { 924 return holder6.isIPv4CompatibleAddress(); 925 } 926 927 // Utilities 928 private final static int INT16SZ = 2; 929 930 /* 931 * Convert IPv6 binary address into presentation (printable) format. 932 * 933 * @param src a byte array representing the IPv6 numeric address 934 * @return a String representing an IPv6 address in 935 * textual representation format 936 * @since 1.4 937 */ numericToTextFormat(byte[] src)938 static String numericToTextFormat(byte[] src) { 939 StringBuilder sb = new StringBuilder(39); 940 for (int i = 0; i < (INADDRSZ / INT16SZ); i++) { 941 sb.append(Integer.toHexString(((src[i<<1]<<8) & 0xff00) 942 | (src[(i<<1)+1] & 0xff))); 943 if (i < (INADDRSZ / INT16SZ) -1 ) { 944 sb.append(":"); 945 } 946 } 947 return sb.toString(); 948 } 949 } 950