299 lines
10 KiB
Java
299 lines
10 KiB
Java
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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 final static int INADDR4SZ = 4;
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private final static int INADDR16SZ = 16;
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private final static 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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// BEGIN Android-changed: Require all four parts to be given for an IPv4 address.
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/*
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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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*/
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case 0:
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case 1:
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case 2:
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return null;
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// END Android-changed: Require all four parts to be given for an IPv4 address.
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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) {
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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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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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if (chval != -1) {
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val <<= 4;
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val |= chval;
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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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}
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if (ch == ':') {
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curtok = i;
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if (!saw_xdigit) {
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if (colonp != -1)
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return null;
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colonp = j;
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continue;
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} 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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}
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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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int dot_count = 0, index=0;
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while ((index = ia4.indexOf ('.', index)) != -1) {
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dot_count ++;
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index ++;
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}
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if (dot_count != 3) {
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return null;
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}
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byte[] v4addr = textToNumericFormatV4(ia4);
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if (v4addr == null) {
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return null;
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}
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for (int k = 0; k < INADDR4SZ; k++) {
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dst[j++] = v4addr[k];
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}
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saw_xdigit = false;
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break; /* '\0' was seen by inet_pton4(). */
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}
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return null;
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}
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if (saw_xdigit) {
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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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}
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if (colonp != -1) {
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int n = j - colonp;
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if (j == INADDR16SZ)
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return null;
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for (i = 1; i <= n; i++) {
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dst[INADDR16SZ - i] = dst[colonp + n - i];
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dst[colonp + n - i] = 0;
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}
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j = INADDR16SZ;
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}
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if (j != INADDR16SZ)
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return null;
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byte[] newdst = convertFromIPv4MappedAddress(dst);
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if (newdst != null) {
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return newdst;
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} else {
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return dst;
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}
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}
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/**
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* @param src a String representing an IPv4 address in textual format
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* @return a boolean indicating whether src is an IPv4 literal address
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*/
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public static boolean isIPv4LiteralAddress(String src) {
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return textToNumericFormatV4(src) != null;
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}
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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 boolean indicating whether src is an IPv6 literal address
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*/
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public static boolean isIPv6LiteralAddress(String src) {
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return textToNumericFormatV6(src) != null;
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}
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/*
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* Convert IPv4-Mapped address to IPv4 address. Both input and
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* returned value are in network order binary form.
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*
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* @param src a String representing an IPv4-Mapped address in textual format
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* @return a byte array representing the IPv4 numeric address
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*/
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public static byte[] convertFromIPv4MappedAddress(byte[] addr) {
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if (isIPv4MappedAddress(addr)) {
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byte[] newAddr = new byte[INADDR4SZ];
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System.arraycopy(addr, 12, newAddr, 0, INADDR4SZ);
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return newAddr;
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}
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return null;
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}
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/**
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* Utility routine to check if the InetAddress is an
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* IPv4 mapped IPv6 address.
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*
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* @return a <code>boolean</code> indicating if the InetAddress is
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* an IPv4 mapped IPv6 address; or false if address is IPv4 address.
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*/
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private static boolean isIPv4MappedAddress(byte[] addr) {
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if (addr.length < INADDR16SZ) {
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return false;
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}
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if ((addr[0] == 0x00) && (addr[1] == 0x00) &&
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(addr[2] == 0x00) && (addr[3] == 0x00) &&
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(addr[4] == 0x00) && (addr[5] == 0x00) &&
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(addr[6] == 0x00) && (addr[7] == 0x00) &&
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(addr[8] == 0x00) && (addr[9] == 0x00) &&
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(addr[10] == (byte)0xff) &&
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(addr[11] == (byte)0xff)) {
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return true;
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}
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return false;
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}
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}
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