J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2000-2002 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package com.sun.jndi.dns; |
| 27 | |
| 28 | import javax.naming.InvalidNameException; |
| 29 | |
| 30 | |
| 31 | /** |
| 32 | * The ResourceRecord class represents a DNS resource record. |
| 33 | * The string format is based on the master file representation in |
| 34 | * RFC 1035. |
| 35 | * |
| 36 | * @author Scott Seligman |
| 37 | */ |
| 38 | |
| 39 | |
| 40 | public class ResourceRecord { |
| 41 | |
| 42 | /* |
| 43 | * Resource record type codes |
| 44 | */ |
| 45 | static final int TYPE_A = 1; |
| 46 | static final int TYPE_NS = 2; |
| 47 | static final int TYPE_CNAME = 5; |
| 48 | static final int TYPE_SOA = 6; |
| 49 | static final int TYPE_PTR = 12; |
| 50 | static final int TYPE_HINFO = 13; |
| 51 | static final int TYPE_MX = 15; |
| 52 | static final int TYPE_TXT = 16; |
| 53 | static final int TYPE_AAAA = 28; |
| 54 | static final int TYPE_SRV = 33; |
| 55 | static final int TYPE_NAPTR = 35; |
| 56 | static final int QTYPE_AXFR = 252; // zone transfer |
| 57 | static final int QTYPE_STAR = 255; // query type "*" |
| 58 | |
| 59 | /* |
| 60 | * Mapping from resource record type codes to type name strings. |
| 61 | */ |
| 62 | static final String rrTypeNames[] = { |
| 63 | null, "A", "NS", null, null, |
| 64 | "CNAME", "SOA", null, null, null, |
| 65 | null, null, "PTR", "HINFO", null, |
| 66 | "MX", "TXT", null, null, null, |
| 67 | null, null, null, null, null, |
| 68 | null, null, null, "AAAA", null, |
| 69 | null, null, null, "SRV", null, |
| 70 | "NAPTR" |
| 71 | }; |
| 72 | |
| 73 | /* |
| 74 | * Resource record class codes |
| 75 | */ |
| 76 | static final int CLASS_INTERNET = 1; |
| 77 | static final int CLASS_HESIOD = 2; |
| 78 | static final int QCLASS_STAR = 255; // query class "*" |
| 79 | |
| 80 | /* |
| 81 | * Mapping from resource record type codes to class name strings. |
| 82 | */ |
| 83 | static final String rrClassNames[] = { |
| 84 | null, "IN", null, null, "HS" |
| 85 | }; |
| 86 | |
| 87 | |
| 88 | byte[] msg; // DNS message |
| 89 | int msgLen; // msg size (in octets) |
| 90 | boolean qSection; // true if this RR is part of question section |
| 91 | // and therefore has no ttl or rdata |
| 92 | int offset; // offset of RR w/in msg |
| 93 | int rrlen; // number of octets in encoded RR |
| 94 | DnsName name; // name field of RR, including root label |
| 95 | int rrtype; // type field of RR |
| 96 | String rrtypeName; // name of of rrtype |
| 97 | int rrclass; // class field of RR |
| 98 | String rrclassName; // name of rrclass |
| 99 | int ttl = 0; // ttl field of RR |
| 100 | int rdlen = 0; // number of octets of rdata |
| 101 | Object rdata = null; // rdata -- most are String, unknown are byte[] |
| 102 | |
| 103 | |
| 104 | /* |
| 105 | * Constructs a new ResourceRecord. The encoded data of the DNS |
| 106 | * message is contained in msg; data for this RR begins at msg[offset]. |
| 107 | * If qSection is true this RR is part of a question section. It's |
| 108 | * not a true resource record in that case, but is treated as if it |
| 109 | * were a shortened one (with no ttl or rdata). If decodeRdata is |
| 110 | * false, the rdata is not decoded (and getRdata() will return null) |
| 111 | * unless this is an SOA record. |
| 112 | * |
| 113 | * @throws InvalidNameException if a decoded domain name isn't valid. |
| 114 | * @throws ArrayIndexOutOfBoundsException given certain other corrupt data. |
| 115 | */ |
| 116 | ResourceRecord(byte[] msg, int msgLen, int offset, |
| 117 | boolean qSection, boolean decodeRdata) |
| 118 | throws InvalidNameException { |
| 119 | |
| 120 | this.msg = msg; |
| 121 | this.msgLen = msgLen; |
| 122 | this.offset = offset; |
| 123 | this.qSection = qSection; |
| 124 | decode(decodeRdata); |
| 125 | } |
| 126 | |
| 127 | public String toString() { |
| 128 | String text = name + " " + rrclassName + " " + rrtypeName; |
| 129 | if (!qSection) { |
| 130 | text += " " + ttl + " " + |
| 131 | ((rdata != null) ? rdata : "[n/a]"); |
| 132 | } |
| 133 | return text; |
| 134 | } |
| 135 | |
| 136 | /* |
| 137 | * Returns the name field of this RR, including the root label. |
| 138 | */ |
| 139 | public DnsName getName() { |
| 140 | return name; |
| 141 | } |
| 142 | |
| 143 | /* |
| 144 | * Returns the number of octets in the encoded RR. |
| 145 | */ |
| 146 | public int size() { |
| 147 | return rrlen; |
| 148 | } |
| 149 | |
| 150 | public int getType() { |
| 151 | return rrtype; |
| 152 | } |
| 153 | |
| 154 | public int getRrclass() { |
| 155 | return rrclass; |
| 156 | } |
| 157 | |
| 158 | public Object getRdata() { |
| 159 | return rdata; |
| 160 | } |
| 161 | |
| 162 | |
| 163 | public static String getTypeName(int rrtype) { |
| 164 | return valueToName(rrtype, rrTypeNames); |
| 165 | } |
| 166 | |
| 167 | public static int getType(String typeName) { |
| 168 | return nameToValue(typeName, rrTypeNames); |
| 169 | } |
| 170 | |
| 171 | public static String getRrclassName(int rrclass) { |
| 172 | return valueToName(rrclass, rrClassNames); |
| 173 | } |
| 174 | |
| 175 | public static int getRrclass(String className) { |
| 176 | return nameToValue(className, rrClassNames); |
| 177 | } |
| 178 | |
| 179 | private static String valueToName(int val, String[] names) { |
| 180 | String name = null; |
| 181 | if ((val > 0) && (val < names.length)) { |
| 182 | name = names[val]; |
| 183 | } else if (val == QTYPE_STAR) { // QTYPE_STAR == QCLASS_STAR |
| 184 | name = "*"; |
| 185 | } |
| 186 | if (name == null) { |
| 187 | name = Integer.toString(val); |
| 188 | } |
| 189 | return name; |
| 190 | } |
| 191 | |
| 192 | private static int nameToValue(String name, String[] names) { |
| 193 | if (name.equals("")) { |
| 194 | return -1; // invalid name |
| 195 | } else if (name.equals("*")) { |
| 196 | return QTYPE_STAR; // QTYPE_STAR == QCLASS_STAR |
| 197 | } |
| 198 | if (Character.isDigit(name.charAt(0))) { |
| 199 | try { |
| 200 | return Integer.parseInt(name); |
| 201 | } catch (NumberFormatException e) { |
| 202 | } |
| 203 | } |
| 204 | for (int i = 1; i < names.length; i++) { |
| 205 | if ((names[i] != null) && |
| 206 | name.equalsIgnoreCase(names[i])) { |
| 207 | return i; |
| 208 | } |
| 209 | } |
| 210 | return -1; // unknown name |
| 211 | } |
| 212 | |
| 213 | /* |
| 214 | * Compares two SOA record serial numbers using 32-bit serial number |
| 215 | * arithmetic as defined in RFC 1982. Serial numbers are unsigned |
| 216 | * 32-bit quantities. Returns a negative, zero, or positive value |
| 217 | * as the first serial number is less than, equal to, or greater |
| 218 | * than the second. If the serial numbers are not comparable the |
| 219 | * result is undefined. Note that the relation is not transitive. |
| 220 | */ |
| 221 | public static int compareSerialNumbers(long s1, long s2) { |
| 222 | long diff = s2 - s1; |
| 223 | if (diff == 0) { |
| 224 | return 0; |
| 225 | } else if ((diff > 0 && diff <= 0x7FFFFFFF) || |
| 226 | (diff < 0 && -diff > 0x7FFFFFFF)) { |
| 227 | return -1; |
| 228 | } else { |
| 229 | return 1; |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | |
| 234 | /* |
| 235 | * Decodes the binary format of the RR. |
| 236 | * May throw ArrayIndexOutOfBoundsException given corrupt data. |
| 237 | */ |
| 238 | private void decode(boolean decodeRdata) throws InvalidNameException { |
| 239 | int pos = offset; // index of next unread octet |
| 240 | |
| 241 | name = new DnsName(); // NAME |
| 242 | pos = decodeName(pos, name); |
| 243 | |
| 244 | rrtype = getUShort(pos); // TYPE |
| 245 | rrtypeName = (rrtype < rrTypeNames.length) |
| 246 | ? rrTypeNames[rrtype] |
| 247 | : null; |
| 248 | if (rrtypeName == null) { |
| 249 | rrtypeName = Integer.toString(rrtype); |
| 250 | } |
| 251 | pos += 2; |
| 252 | |
| 253 | rrclass = getUShort(pos); // CLASS |
| 254 | rrclassName = (rrclass < rrClassNames.length) |
| 255 | ? rrClassNames[rrclass] |
| 256 | : null; |
| 257 | if (rrclassName == null) { |
| 258 | rrclassName = Integer.toString(rrclass); |
| 259 | } |
| 260 | pos += 2; |
| 261 | |
| 262 | if (!qSection) { |
| 263 | ttl = getInt(pos); // TTL |
| 264 | pos += 4; |
| 265 | |
| 266 | rdlen = getUShort(pos); // RDLENGTH |
| 267 | pos += 2; |
| 268 | |
| 269 | rdata = (decodeRdata || // RDATA |
| 270 | (rrtype == TYPE_SOA)) |
| 271 | ? decodeRdata(pos) |
| 272 | : null; |
| 273 | if (rdata instanceof DnsName) { |
| 274 | rdata = rdata.toString(); |
| 275 | } |
| 276 | pos += rdlen; |
| 277 | } |
| 278 | |
| 279 | rrlen = pos - offset; |
| 280 | |
| 281 | msg = null; // free up for GC |
| 282 | } |
| 283 | |
| 284 | /* |
| 285 | * Returns the 1-byte unsigned value at msg[pos]. |
| 286 | */ |
| 287 | private int getUByte(int pos) { |
| 288 | return (msg[pos] & 0xFF); |
| 289 | } |
| 290 | |
| 291 | /* |
| 292 | * Returns the 2-byte unsigned value at msg[pos]. The high |
| 293 | * order byte comes first. |
| 294 | */ |
| 295 | private int getUShort(int pos) { |
| 296 | return (((msg[pos] & 0xFF) << 8) | |
| 297 | (msg[pos + 1] & 0xFF)); |
| 298 | } |
| 299 | |
| 300 | /* |
| 301 | * Returns the 4-byte signed value at msg[pos]. The high |
| 302 | * order byte comes first. |
| 303 | */ |
| 304 | private int getInt(int pos) { |
| 305 | return ((getUShort(pos) << 16) | getUShort(pos + 2)); |
| 306 | } |
| 307 | |
| 308 | /* |
| 309 | * Returns the 4-byte unsigned value at msg[pos]. The high |
| 310 | * order byte comes first. |
| 311 | */ |
| 312 | private long getUInt(int pos) { |
| 313 | return (getInt(pos) & 0xffffffffL); |
| 314 | } |
| 315 | |
| 316 | /* |
| 317 | * Returns the name encoded at msg[pos], including the root label. |
| 318 | */ |
| 319 | private DnsName decodeName(int pos) throws InvalidNameException { |
| 320 | DnsName n = new DnsName(); |
| 321 | decodeName(pos, n); |
| 322 | return n; |
| 323 | } |
| 324 | |
| 325 | /* |
| 326 | * Prepends to "n" the domain name encoded at msg[pos], including the root |
| 327 | * label. Returns the index into "msg" following the name. |
| 328 | */ |
| 329 | private int decodeName(int pos, DnsName n) throws InvalidNameException { |
| 330 | if (msg[pos] == 0) { // end of name |
| 331 | n.add(0, ""); |
| 332 | return (pos + 1); |
| 333 | } else if ((msg[pos] & 0xC0) != 0) { // name compression |
| 334 | decodeName(getUShort(pos) & 0x3FFF, n); |
| 335 | return (pos + 2); |
| 336 | } else { // append a label |
| 337 | int len = msg[pos++]; |
| 338 | try { |
| 339 | n.add(0, new String(msg, pos, len, "ISO-8859-1")); |
| 340 | } catch (java.io.UnsupportedEncodingException e) { |
| 341 | // assert false : "ISO-Latin-1 charset unavailable"; |
| 342 | } |
| 343 | return decodeName(pos + len, n); |
| 344 | } |
| 345 | } |
| 346 | |
| 347 | /* |
| 348 | * Returns the rdata encoded at msg[pos]. The format is dependent |
| 349 | * on the rrtype and rrclass values, which have already been set. |
| 350 | * The length of the encoded data is rdlen, which has already been |
| 351 | * set. |
| 352 | * The rdata of records with unknown type/class combinations is |
| 353 | * returned in a newly-allocated byte array. |
| 354 | */ |
| 355 | private Object decodeRdata(int pos) throws InvalidNameException { |
| 356 | if (rrclass == CLASS_INTERNET) { |
| 357 | switch (rrtype) { |
| 358 | case TYPE_A: |
| 359 | return decodeA(pos); |
| 360 | case TYPE_AAAA: |
| 361 | return decodeAAAA(pos); |
| 362 | case TYPE_CNAME: |
| 363 | case TYPE_NS: |
| 364 | case TYPE_PTR: |
| 365 | return decodeName(pos); |
| 366 | case TYPE_MX: |
| 367 | return decodeMx(pos); |
| 368 | case TYPE_SOA: |
| 369 | return decodeSoa(pos); |
| 370 | case TYPE_SRV: |
| 371 | return decodeSrv(pos); |
| 372 | case TYPE_NAPTR: |
| 373 | return decodeNaptr(pos); |
| 374 | case TYPE_TXT: |
| 375 | return decodeTxt(pos); |
| 376 | case TYPE_HINFO: |
| 377 | return decodeHinfo(pos); |
| 378 | } |
| 379 | } |
| 380 | // Unknown RR type/class |
| 381 | byte[] rd = new byte[rdlen]; |
| 382 | System.arraycopy(msg, pos, rd, 0, rdlen); |
| 383 | return rd; |
| 384 | } |
| 385 | |
| 386 | /* |
| 387 | * Returns the rdata of an MX record that is encoded at msg[pos]. |
| 388 | */ |
| 389 | private String decodeMx(int pos) throws InvalidNameException { |
| 390 | int preference = getUShort(pos); |
| 391 | pos += 2; |
| 392 | DnsName name = decodeName(pos); |
| 393 | return (preference + " " + name); |
| 394 | } |
| 395 | |
| 396 | /* |
| 397 | * Returns the rdata of an SOA record that is encoded at msg[pos]. |
| 398 | */ |
| 399 | private String decodeSoa(int pos) throws InvalidNameException { |
| 400 | DnsName mname = new DnsName(); |
| 401 | pos = decodeName(pos, mname); |
| 402 | DnsName rname = new DnsName(); |
| 403 | pos = decodeName(pos, rname); |
| 404 | |
| 405 | long serial = getUInt(pos); |
| 406 | pos += 4; |
| 407 | long refresh = getUInt(pos); |
| 408 | pos += 4; |
| 409 | long retry = getUInt(pos); |
| 410 | pos += 4; |
| 411 | long expire = getUInt(pos); |
| 412 | pos += 4; |
| 413 | long minimum = getUInt(pos); // now used as negative TTL |
| 414 | pos += 4; |
| 415 | |
| 416 | return (mname + " " + rname + " " + serial + " " + |
| 417 | refresh + " " + retry + " " + expire + " " + minimum); |
| 418 | } |
| 419 | |
| 420 | /* |
| 421 | * Returns the rdata of an SRV record that is encoded at msg[pos]. |
| 422 | * See RFC 2782. |
| 423 | */ |
| 424 | private String decodeSrv(int pos) throws InvalidNameException { |
| 425 | int priority = getUShort(pos); |
| 426 | pos += 2; |
| 427 | int weight = getUShort(pos); |
| 428 | pos += 2; |
| 429 | int port = getUShort(pos); |
| 430 | pos += 2; |
| 431 | DnsName target = decodeName(pos); |
| 432 | return (priority + " " + weight + " " + port + " " + target); |
| 433 | } |
| 434 | |
| 435 | /* |
| 436 | * Returns the rdata of an NAPTR record that is encoded at msg[pos]. |
| 437 | * See RFC 2915. |
| 438 | */ |
| 439 | private String decodeNaptr(int pos) throws InvalidNameException { |
| 440 | int order = getUShort(pos); |
| 441 | pos += 2; |
| 442 | int preference = getUShort(pos); |
| 443 | pos += 2; |
| 444 | StringBuffer flags = new StringBuffer(); |
| 445 | pos += decodeCharString(pos, flags); |
| 446 | StringBuffer services = new StringBuffer(); |
| 447 | pos += decodeCharString(pos, services); |
| 448 | StringBuffer regexp = new StringBuffer(rdlen); |
| 449 | pos += decodeCharString(pos, regexp); |
| 450 | DnsName replacement = decodeName(pos); |
| 451 | |
| 452 | return (order + " " + preference + " " + flags + " " + |
| 453 | services + " " + regexp + " " + replacement); |
| 454 | } |
| 455 | |
| 456 | /* |
| 457 | * Returns the rdata of a TXT record that is encoded at msg[pos]. |
| 458 | * The rdata consists of one or more <character-string>s. |
| 459 | */ |
| 460 | private String decodeTxt(int pos) { |
| 461 | StringBuffer buf = new StringBuffer(rdlen); |
| 462 | int end = pos + rdlen; |
| 463 | while (pos < end) { |
| 464 | pos += decodeCharString(pos, buf); |
| 465 | if (pos < end) { |
| 466 | buf.append(' '); |
| 467 | } |
| 468 | } |
| 469 | return buf.toString(); |
| 470 | } |
| 471 | |
| 472 | /* |
| 473 | * Returns the rdata of an HINFO record that is encoded at msg[pos]. |
| 474 | * The rdata consists of two <character-string>s. |
| 475 | */ |
| 476 | private String decodeHinfo(int pos) { |
| 477 | StringBuffer buf = new StringBuffer(rdlen); |
| 478 | pos += decodeCharString(pos, buf); |
| 479 | buf.append(' '); |
| 480 | pos += decodeCharString(pos, buf); |
| 481 | return buf.toString(); |
| 482 | } |
| 483 | |
| 484 | /* |
| 485 | * Decodes the <character-string> at msg[pos] and adds it to buf. |
| 486 | * If the string contains one of the meta-characters ' ', '\\', or |
| 487 | * '"', then the result is quoted and any embedded '\\' or '"' |
| 488 | * chars are escaped with '\\'. Empty strings are also quoted. |
| 489 | * Returns the size of the encoded string, including the initial |
| 490 | * length octet. |
| 491 | */ |
| 492 | private int decodeCharString(int pos, StringBuffer buf) { |
| 493 | int start = buf.length(); // starting index of this string |
| 494 | int len = getUByte(pos++); // encoded string length |
| 495 | boolean quoted = (len == 0); // quote string if empty |
| 496 | for (int i = 0; i < len; i++) { |
| 497 | int c = getUByte(pos++); |
| 498 | quoted |= (c == ' '); |
| 499 | if ((c == '\\') || (c == '"')) { |
| 500 | quoted = true; |
| 501 | buf.append('\\'); |
| 502 | } |
| 503 | buf.append((char) c); |
| 504 | } |
| 505 | if (quoted) { |
| 506 | buf.insert(start, '"'); |
| 507 | buf.append('"'); |
| 508 | } |
| 509 | return (len + 1); // size includes initial octet |
| 510 | } |
| 511 | |
| 512 | /* |
| 513 | * Returns the rdata of an A record, in dotted-decimal format, |
| 514 | * that is encoded at msg[pos]. |
| 515 | */ |
| 516 | private String decodeA(int pos) { |
| 517 | return ((msg[pos] & 0xff) + "." + |
| 518 | (msg[pos + 1] & 0xff) + "." + |
| 519 | (msg[pos + 2] & 0xff) + "." + |
| 520 | (msg[pos + 3] & 0xff)); |
| 521 | } |
| 522 | |
| 523 | /* |
| 524 | * Returns the rdata of an AAAA record, in colon-separated format, |
| 525 | * that is encoded at msg[pos]. For example: 4321:0:1:2:3:4:567:89ab. |
| 526 | * See RFCs 1886 and 2373. |
| 527 | */ |
| 528 | private String decodeAAAA(int pos) { |
| 529 | int[] addr6 = new int[8]; // the unsigned 16-bit words of the address |
| 530 | for (int i = 0; i < 8; i++) { |
| 531 | addr6[i] = getUShort(pos); |
| 532 | pos += 2; |
| 533 | } |
| 534 | |
| 535 | // Find longest sequence of two or more zeros, to compress them. |
| 536 | int curBase = -1; |
| 537 | int curLen = 0; |
| 538 | int bestBase = -1; |
| 539 | int bestLen = 0; |
| 540 | for (int i = 0; i < 8; i++) { |
| 541 | if (addr6[i] == 0) { |
| 542 | if (curBase == -1) { // new sequence |
| 543 | curBase = i; |
| 544 | curLen = 1; |
| 545 | } else { // extend sequence |
| 546 | ++curLen; |
| 547 | if ((curLen >= 2) && (curLen > bestLen)) { |
| 548 | bestBase = curBase; |
| 549 | bestLen = curLen; |
| 550 | } |
| 551 | } |
| 552 | } else { // not in sequence |
| 553 | curBase = -1; |
| 554 | } |
| 555 | } |
| 556 | |
| 557 | // If addr begins with at least 6 zeros and is not :: or ::1, |
| 558 | // or with 5 zeros followed by 0xffff, use the text format for |
| 559 | // IPv4-compatible or IPv4-mapped addresses. |
| 560 | if (bestBase == 0) { |
| 561 | if ((bestLen == 6) || |
| 562 | ((bestLen == 7) && (addr6[7] > 1))) { |
| 563 | return ("::" + decodeA(pos - 4)); |
| 564 | } else if ((bestLen == 5) && (addr6[5] == 0xffff)) { |
| 565 | return ("::ffff:" + decodeA(pos - 4)); |
| 566 | } |
| 567 | } |
| 568 | |
| 569 | // If bestBase != -1, compress zeros in [bestBase, bestBase+bestLen) |
| 570 | boolean compress = (bestBase != -1); |
| 571 | |
| 572 | StringBuffer buf = new StringBuffer(40); |
| 573 | if (bestBase == 0) { |
| 574 | buf.append(':'); |
| 575 | } |
| 576 | for (int i = 0; i < 8; i++) { |
| 577 | if (!compress || (i < bestBase) || (i >= bestBase + bestLen)) { |
| 578 | buf.append(Integer.toHexString(addr6[i])); |
| 579 | if (i < 7) { |
| 580 | buf.append(':'); |
| 581 | } |
| 582 | } else if (compress && (i == bestBase)) { // first compressed zero |
| 583 | buf.append(':'); |
| 584 | } |
| 585 | } |
| 586 | |
| 587 | return buf.toString(); |
| 588 | } |
| 589 | } |