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