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| 1 | /* | ||
| 2 | * Copyright (c) 2004, 2005, Oracle and/or its affiliates. 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. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.net.util; | ||
| 27 | |||
| 28 | public class IPAddressUtil { | ||
| 29 | private final static int INADDR4SZ = 4; | ||
| 30 | private final static int INADDR16SZ = 16; | ||
| 31 | private final static int INT16SZ = 2; | ||
| 32 | |||
| 33 | /* | ||
| 34 | * Converts IPv4 address in its textual presentation form | ||
| 35 | * into its numeric binary form. | ||
| 36 | * | ||
| 37 | * @param src a String representing an IPv4 address in standard format | ||
| 38 | * @return a byte array representing the IPv4 numeric address | ||
| 39 | */ | ||
| 40 | public static byte[] textToNumericFormatV4(String src) | ||
| 41 | { | ||
| 42 | if (src.length() == 0) { | ||
| 43 | return null; | ||
| 44 | } | ||
| 45 | |||
| 46 | byte[] res = new byte[INADDR4SZ]; | ||
| 47 | String[] s = src.split("\\.", -1); | ||
| 48 | long val; | ||
| 49 | try { | ||
| 50 | switch(s.length) { | ||
| 51 | case 1: | ||
| 52 | /* | ||
| 53 | * When only one part is given, the value is stored directly in | ||
| 54 | * the network address without any byte rearrangement. | ||
| 55 | */ | ||
| 56 | |||
| 57 | val = Long.parseLong(s[0]); | ||
| 58 | if (val < 0 || val > 0xffffffffL) | ||
| 59 | return null; | ||
| 60 | res[0] = (byte) ((val >> 24) & 0xff); | ||
| 61 | res[1] = (byte) (((val & 0xffffff) >> 16) & 0xff); | ||
| 62 | res[2] = (byte) (((val & 0xffff) >> 8) & 0xff); | ||
| 63 | res[3] = (byte) (val & 0xff); | ||
| 64 | break; | ||
| 65 | case 2: | ||
| 66 | /* | ||
| 67 | * When a two part address is supplied, the last part is | ||
| 68 | * interpreted as a 24-bit quantity and placed in the right | ||
| 69 | * most three bytes of the network address. This makes the | ||
| 70 | * two part address format convenient for specifying Class A | ||
| 71 | * network addresses as net.host. | ||
| 72 | */ | ||
| 73 | |||
| 74 | val = Integer.parseInt(s[0]); | ||
| 75 | if (val < 0 || val > 0xff) | ||
| 76 | return null; | ||
| 77 | res[0] = (byte) (val & 0xff); | ||
| 78 | val = Integer.parseInt(s[1]); | ||
| 79 | if (val < 0 || val > 0xffffff) | ||
| 80 | return null; | ||
| 81 | res[1] = (byte) ((val >> 16) & 0xff); | ||
| 82 | res[2] = (byte) (((val & 0xffff) >> 8) &0xff); | ||
| 83 | res[3] = (byte) (val & 0xff); | ||
| 84 | break; | ||
| 85 | case 3: | ||
| 86 | /* | ||
| 87 | * When a three part address is specified, the last part is | ||
| 88 | * interpreted as a 16-bit quantity and placed in the right | ||
| 89 | * most two bytes of the network address. This makes the | ||
| 90 | * three part address format convenient for specifying | ||
| 91 | * Class B net- work addresses as 128.net.host. | ||
| 92 | */ | ||
| 93 | for (int i = 0; i < 2; i++) { | ||
| 94 | val = Integer.parseInt(s[i]); | ||
| 95 | if (val < 0 || val > 0xff) | ||
| 96 | return null; | ||
| 97 | res[i] = (byte) (val & 0xff); | ||
| 98 | } | ||
| 99 | val = Integer.parseInt(s[2]); | ||
| 100 | if (val < 0 || val > 0xffff) | ||
| 101 | return null; | ||
| 102 | res[2] = (byte) ((val >> 8) & 0xff); | ||
| 103 | res[3] = (byte) (val & 0xff); | ||
| 104 | break; | ||
| 105 | case 4: | ||
| 106 | /* | ||
| 107 | * When four parts are specified, each is interpreted as a | ||
| 108 | * byte of data and assigned, from left to right, to the | ||
| 109 | * four bytes of an IPv4 address. | ||
| 110 | */ | ||
| 111 | for (int i = 0; i < 4; i++) { | ||
| 112 | val = Integer.parseInt(s[i]); | ||
| 113 | if (val < 0 || val > 0xff) | ||
| 114 | return null; | ||
| 115 | res[i] = (byte) (val & 0xff); | ||
| 116 | } | ||
| 117 | break; | ||
| 118 | default: | ||
| 119 | return null; | ||
| 120 | } | ||
| 121 | } catch(NumberFormatException e) { | ||
| 122 | return null; | ||
| 123 | } | ||
| 124 | return res; | ||
| 125 | } | ||
| 126 | |||
| 127 | /* | ||
| 128 | * Convert IPv6 presentation level address to network order binary form. | ||
| 129 | * credit: | ||
| 130 | * Converted from C code from Solaris 8 (inet_pton) | ||
| 131 | * | ||
| 132 | * Any component of the string following a per-cent % is ignored. | ||
| 133 | * | ||
| 134 | * @param src a String representing an IPv6 address in textual format | ||
| 135 | * @return a byte array representing the IPv6 numeric address | ||
| 136 | */ | ||
| 137 | public static byte[] textToNumericFormatV6(String src) | ||
| 138 | { | ||
| 139 | // Shortest valid string is "::", hence at least 2 chars | ||
| 140 | if (src.length() < 2) { | ||
| 141 | return null; | ||
| 142 | } | ||
| 143 | |||
| 144 | int colonp; | ||
| 145 | char ch; | ||
| 146 | boolean saw_xdigit; | ||
| 147 | int val; | ||
| 148 | char[] srcb = src.toCharArray(); | ||
| 149 | byte[] dst = new byte[INADDR16SZ]; | ||
| 150 | |||
| 151 | int srcb_length = srcb.length; | ||
| 152 | int pc = src.indexOf ("%"); | ||
| 153 | if (pc == srcb_length -1) { | ||
| 154 | return null; | ||
| 155 | } | ||
| 156 | |||
| 157 | if (pc != -1) { | ||
| 158 | srcb_length = pc; | ||
| 159 | } | ||
| 160 | |||
| 161 | colonp = -1; | ||
| 162 | int i = 0, j = 0; | ||
| 163 | /* Leading :: requires some special handling. */ | ||
| 164 | if (srcb[i] == ':') | ||
| 165 | if (srcb[++i] != ':') | ||
| 166 | return null; | ||
| 167 | int curtok = i; | ||
| 168 | saw_xdigit = false; | ||
| 169 | val = 0; | ||
| 170 | while (i < srcb_length) { | ||
| 171 | ch = srcb[i++]; | ||
| 172 | int chval = Character.digit(ch, 16); | ||
| 173 | if (chval != -1) { | ||
| 174 | val <<= 4; | ||
| 175 | val |= chval; | ||
| 176 | if (val > 0xffff) | ||
| 177 | return null; | ||
| 178 | saw_xdigit = true; | ||
| 179 | continue; | ||
| 180 | } | ||
| 181 | if (ch == ':') { | ||
| 182 | curtok = i; | ||
| 183 | if (!saw_xdigit) { | ||
| 184 | if (colonp != -1) | ||
| 185 | return null; | ||
| 186 | colonp = j; | ||
| 187 | continue; | ||
| 188 | } else if (i == srcb_length) { | ||
| 189 | return null; | ||
| 190 | } | ||
| 191 | if (j + INT16SZ > INADDR16SZ) | ||
| 192 | return null; | ||
| 193 | dst[j++] = (byte) ((val >> 8) & 0xff); | ||
| 194 | dst[j++] = (byte) (val & 0xff); | ||
| 195 | saw_xdigit = false; | ||
| 196 | val = 0; | ||
| 197 | continue; | ||
| 198 | } | ||
| 199 | if (ch == '.' && ((j + INADDR4SZ) <= INADDR16SZ)) { | ||
| 200 | String ia4 = src.substring(curtok, srcb_length); | ||
| 201 | /* check this IPv4 address has 3 dots, ie. A.B.C.D */ | ||
| 202 | int dot_count = 0, index=0; | ||
| 203 | while ((index = ia4.indexOf ('.', index)) != -1) { | ||
| 204 | dot_count ++; | ||
| 205 | index ++; | ||
| 206 | } | ||
| 207 | if (dot_count != 3) { | ||
| 208 | return null; | ||
| 209 | } | ||
| 210 | byte[] v4addr = textToNumericFormatV4(ia4); | ||
| 211 | if (v4addr == null) { | ||
| 212 | return null; | ||
| 213 | } | ||
| 214 | for (int k = 0; k < INADDR4SZ; k++) { | ||
| 215 | dst[j++] = v4addr[k]; | ||
| 216 | } | ||
| 217 | saw_xdigit = false; | ||
| 218 | break; /* '\0' was seen by inet_pton4(). */ | ||
| 219 | } | ||
| 220 | return null; | ||
| 221 | } | ||
| 222 | if (saw_xdigit) { | ||
| 223 | if (j + INT16SZ > INADDR16SZ) | ||
| 224 | return null; | ||
| 225 | dst[j++] = (byte) ((val >> 8) & 0xff); | ||
| 226 | dst[j++] = (byte) (val & 0xff); | ||
| 227 | } | ||
| 228 | |||
| 229 | if (colonp != -1) { | ||
| 230 | int n = j - colonp; | ||
| 231 | |||
| 232 | if (j == INADDR16SZ) | ||
| 233 | return null; | ||
| 234 | for (i = 1; i <= n; i++) { | ||
| 235 | dst[INADDR16SZ - i] = dst[colonp + n - i]; | ||
| 236 | dst[colonp + n - i] = 0; | ||
| 237 | } | ||
| 238 | j = INADDR16SZ; | ||
| 239 | } | ||
| 240 | if (j != INADDR16SZ) | ||
| 241 | return null; | ||
| 242 | byte[] newdst = convertFromIPv4MappedAddress(dst); | ||
| 243 | if (newdst != null) { | ||
| 244 | return newdst; | ||
| 245 | } else { | ||
| 246 | return dst; | ||
| 247 | } | ||
| 248 | } | ||
| 249 | |||
| 250 | /** | ||
| 251 | * @param src a String representing an IPv4 address in textual format | ||
| 252 | * @return a boolean indicating whether src is an IPv4 literal address | ||
| 253 | */ | ||
| 254 | public static boolean isIPv4LiteralAddress(String src) { | ||
| 255 | return textToNumericFormatV4(src) != null; | ||
| 256 | } | ||
| 257 | |||
| 258 | /** | ||
| 259 | * @param src a String representing an IPv6 address in textual format | ||
| 260 | * @return a boolean indicating whether src is an IPv6 literal address | ||
| 261 | */ | ||
| 262 | public static boolean isIPv6LiteralAddress(String src) { | ||
| 263 | return textToNumericFormatV6(src) != null; | ||
| 264 | } | ||
| 265 | |||
| 266 | /* | ||
| 267 | * Convert IPv4-Mapped address to IPv4 address. Both input and | ||
| 268 | * returned value are in network order binary form. | ||
| 269 | * | ||
| 270 | * @param src a String representing an IPv4-Mapped address in textual format | ||
| 271 | * @return a byte array representing the IPv4 numeric address | ||
| 272 | */ | ||
| 273 | public static byte[] convertFromIPv4MappedAddress(byte[] addr) { | ||
| 274 | if (isIPv4MappedAddress(addr)) { | ||
| 275 | byte[] newAddr = new byte[INADDR4SZ]; | ||
| 276 | System.arraycopy(addr, 12, newAddr, 0, INADDR4SZ); | ||
| 277 | return newAddr; | ||
| 278 | } | ||
| 279 | return null; | ||
| 280 | } | ||
| 281 | |||
| 282 | /** | ||
| 283 | * Utility routine to check if the InetAddress is an | ||
| 284 | * IPv4 mapped IPv6 address. | ||
| 285 | * | ||
| 286 | * @return a <code>boolean</code> indicating if the InetAddress is | ||
| 287 | * an IPv4 mapped IPv6 address; or false if address is IPv4 address. | ||
| 288 | */ | ||
| 289 | private static boolean isIPv4MappedAddress(byte[] addr) { | ||
| 290 | if (addr.length < INADDR16SZ) { | ||
| 291 | return false; | ||
| 292 | } | ||
| 293 | if ((addr[0] == 0x00) && (addr[1] == 0x00) && | ||
| 294 | (addr[2] == 0x00) && (addr[3] == 0x00) && | ||
| 295 | (addr[4] == 0x00) && (addr[5] == 0x00) && | ||
| 296 | (addr[6] == 0x00) && (addr[7] == 0x00) && | ||
| 297 | (addr[8] == 0x00) && (addr[9] == 0x00) && | ||
| 298 | (addr[10] == (byte)0xff) && | ||
| 299 | (addr[11] == (byte)0xff)) { | ||
| 300 | return true; | ||
| 301 | } | ||
| 302 | return false; | ||
| 303 | } | ||
| 304 | } | ||