author | martin |
Tue, 15 Sep 2015 21:56:04 -0700 | |
changeset 32649 | 2ee9017c7597 |
parent 32271 | d6cb1602f271 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2004, 2015, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package sun.net.util; |
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public class IPAddressUtil { |
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private static final int INADDR4SZ = 4; |
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private static final int INADDR16SZ = 16; |
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private static final int INT16SZ = 2; |
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/* |
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* Converts IPv4 address in its textual presentation form |
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* into its numeric binary form. |
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* |
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* @param src a String representing an IPv4 address in standard format |
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* @return a byte array representing the IPv4 numeric address |
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*/ |
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@SuppressWarnings("fallthrough") |
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public static byte[] textToNumericFormatV4(String src) |
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{ |
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byte[] res = new byte[INADDR4SZ]; |
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long tmpValue = 0; |
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int currByte = 0; |
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boolean newOctet = true; |
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int len = src.length(); |
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if (len == 0 || len > 15) { |
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return null; |
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} |
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/* |
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* When only one part is given, the value is stored directly in |
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* the network address without any byte rearrangement. |
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* |
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* When a two part address is supplied, the last part is |
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* interpreted as a 24-bit quantity and placed in the right |
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* most three bytes of the network address. This makes the |
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* two part address format convenient for specifying Class A |
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* network addresses as net.host. |
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* |
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* When a three part address is specified, the last part is |
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* interpreted as a 16-bit quantity and placed in the right |
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* most two bytes of the network address. This makes the |
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* three part address format convenient for specifying |
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* Class B net- work addresses as 128.net.host. |
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* |
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* When four parts are specified, each is interpreted as a |
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* byte of data and assigned, from left to right, to the |
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* four bytes of an IPv4 address. |
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* |
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* We determine and parse the leading parts, if any, as single |
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* byte values in one pass directly into the resulting byte[], |
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* then the remainder is treated as a 8-to-32-bit entity and |
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* translated into the remaining bytes in the array. |
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*/ |
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for (int i = 0; i < len; i++) { |
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char c = src.charAt(i); |
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if (c == '.') { |
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if (newOctet || tmpValue < 0 || tmpValue > 0xff || currByte == 3) { |
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return null; |
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} |
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res[currByte++] = (byte) (tmpValue & 0xff); |
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tmpValue = 0; |
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newOctet = true; |
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} else { |
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int digit = Character.digit(c, 10); |
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if (digit < 0) { |
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return null; |
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} |
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tmpValue *= 10; |
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tmpValue += digit; |
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newOctet = false; |
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} |
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} |
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if (newOctet || tmpValue < 0 || tmpValue >= (1L << ((4 - currByte) * 8))) { |
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return null; |
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} |
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switch (currByte) { |
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case 0: |
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res[0] = (byte) ((tmpValue >> 24) & 0xff); |
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case 1: |
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res[1] = (byte) ((tmpValue >> 16) & 0xff); |
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case 2: |
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res[2] = (byte) ((tmpValue >> 8) & 0xff); |
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case 3: |
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res[3] = (byte) ((tmpValue >> 0) & 0xff); |
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} |
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return res; |
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} |
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/* |
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* Convert IPv6 presentation level address to network order binary form. |
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* credit: |
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* Converted from C code from Solaris 8 (inet_pton) |
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* |
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* Any component of the string following a per-cent % is ignored. |
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* |
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* @param src a String representing an IPv6 address in textual format |
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* @return a byte array representing the IPv6 numeric address |
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*/ |
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public static byte[] textToNumericFormatV6(String src) |
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{ |
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// Shortest valid string is "::", hence at least 2 chars |
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if (src.length() < 2) { |
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return null; |
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} |
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int colonp; |
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char ch; |
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boolean saw_xdigit; |
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int val; |
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char[] srcb = src.toCharArray(); |
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byte[] dst = new byte[INADDR16SZ]; |
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int srcb_length = srcb.length; |
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int pc = src.indexOf ('%'); |
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if (pc == srcb_length -1) { |
140 |
return null; |
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} |
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if (pc != -1) { |
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srcb_length = pc; |
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} |
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147 |
colonp = -1; |
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int i = 0, j = 0; |
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/* Leading :: requires some special handling. */ |
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if (srcb[i] == ':') |
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if (srcb[++i] != ':') |
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return null; |
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int curtok = i; |
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saw_xdigit = false; |
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val = 0; |
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while (i < srcb_length) { |
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ch = srcb[i++]; |
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int chval = Character.digit(ch, 16); |
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159 |
if (chval != -1) { |
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val <<= 4; |
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val |= chval; |
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162 |
if (val > 0xffff) |
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return null; |
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saw_xdigit = true; |
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continue; |
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166 |
} |
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if (ch == ':') { |
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168 |
curtok = i; |
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if (!saw_xdigit) { |
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170 |
if (colonp != -1) |
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return null; |
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colonp = j; |
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continue; |
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174 |
} else if (i == srcb_length) { |
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return null; |
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} |
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if (j + INT16SZ > INADDR16SZ) |
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return null; |
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dst[j++] = (byte) ((val >> 8) & 0xff); |
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dst[j++] = (byte) (val & 0xff); |
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saw_xdigit = false; |
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val = 0; |
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continue; |
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184 |
} |
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185 |
if (ch == '.' && ((j + INADDR4SZ) <= INADDR16SZ)) { |
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String ia4 = src.substring(curtok, srcb_length); |
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/* check this IPv4 address has 3 dots, ie. A.B.C.D */ |
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188 |
int dot_count = 0, index=0; |
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189 |
while ((index = ia4.indexOf ('.', index)) != -1) { |
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190 |
dot_count ++; |
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191 |
index ++; |
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192 |
} |
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193 |
if (dot_count != 3) { |
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return null; |
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195 |
} |
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196 |
byte[] v4addr = textToNumericFormatV4(ia4); |
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197 |
if (v4addr == null) { |
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return null; |
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199 |
} |
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200 |
for (int k = 0; k < INADDR4SZ; k++) { |
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dst[j++] = v4addr[k]; |
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202 |
} |
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203 |
saw_xdigit = false; |
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break; /* '\0' was seen by inet_pton4(). */ |
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205 |
} |
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206 |
return null; |
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207 |
} |
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208 |
if (saw_xdigit) { |
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209 |
if (j + INT16SZ > INADDR16SZ) |
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210 |
return null; |
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211 |
dst[j++] = (byte) ((val >> 8) & 0xff); |
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212 |
dst[j++] = (byte) (val & 0xff); |
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213 |
} |
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214 |
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215 |
if (colonp != -1) { |
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216 |
int n = j - colonp; |
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217 |
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218 |
if (j == INADDR16SZ) |
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219 |
return null; |
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220 |
for (i = 1; i <= n; i++) { |
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221 |
dst[INADDR16SZ - i] = dst[colonp + n - i]; |
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222 |
dst[colonp + n - i] = 0; |
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223 |
} |
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224 |
j = INADDR16SZ; |
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225 |
} |
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226 |
if (j != INADDR16SZ) |
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227 |
return null; |
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228 |
byte[] newdst = convertFromIPv4MappedAddress(dst); |
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229 |
if (newdst != null) { |
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230 |
return newdst; |
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231 |
} else { |
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232 |
return dst; |
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233 |
} |
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234 |
} |
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236 |
/** |
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237 |
* @param src a String representing an IPv4 address in textual format |
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238 |
* @return a boolean indicating whether src is an IPv4 literal address |
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239 |
*/ |
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240 |
public static boolean isIPv4LiteralAddress(String src) { |
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241 |
return textToNumericFormatV4(src) != null; |
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242 |
} |
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244 |
/** |
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245 |
* @param src a String representing an IPv6 address in textual format |
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246 |
* @return a boolean indicating whether src is an IPv6 literal address |
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247 |
*/ |
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248 |
public static boolean isIPv6LiteralAddress(String src) { |
|
249 |
return textToNumericFormatV6(src) != null; |
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250 |
} |
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251 |
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252 |
/* |
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253 |
* Convert IPv4-Mapped address to IPv4 address. Both input and |
|
254 |
* returned value are in network order binary form. |
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255 |
* |
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256 |
* @param src a String representing an IPv4-Mapped address in textual format |
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257 |
* @return a byte array representing the IPv4 numeric address |
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258 |
*/ |
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259 |
public static byte[] convertFromIPv4MappedAddress(byte[] addr) { |
|
260 |
if (isIPv4MappedAddress(addr)) { |
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261 |
byte[] newAddr = new byte[INADDR4SZ]; |
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262 |
System.arraycopy(addr, 12, newAddr, 0, INADDR4SZ); |
|
263 |
return newAddr; |
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264 |
} |
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265 |
return null; |
|
266 |
} |
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267 |
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268 |
/** |
|
269 |
* Utility routine to check if the InetAddress is an |
|
270 |
* IPv4 mapped IPv6 address. |
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271 |
* |
|
272 |
* @return a <code>boolean</code> indicating if the InetAddress is |
|
273 |
* an IPv4 mapped IPv6 address; or false if address is IPv4 address. |
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274 |
*/ |
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275 |
private static boolean isIPv4MappedAddress(byte[] addr) { |
|
276 |
if (addr.length < INADDR16SZ) { |
|
277 |
return false; |
|
278 |
} |
|
279 |
if ((addr[0] == 0x00) && (addr[1] == 0x00) && |
|
280 |
(addr[2] == 0x00) && (addr[3] == 0x00) && |
|
281 |
(addr[4] == 0x00) && (addr[5] == 0x00) && |
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282 |
(addr[6] == 0x00) && (addr[7] == 0x00) && |
|
283 |
(addr[8] == 0x00) && (addr[9] == 0x00) && |
|
284 |
(addr[10] == (byte)0xff) && |
|
285 |
(addr[11] == (byte)0xff)) { |
|
286 |
return true; |
|
287 |
} |
|
288 |
return false; |
|
289 |
} |
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290 |
} |