| /* |
| * Copyright (c) 2004, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.net.util; |
| |
| public class IPAddressUtil { |
| private final static int INADDR4SZ = 4; |
| private final static int INADDR16SZ = 16; |
| private final static int INT16SZ = 2; |
| |
| /* |
| * Converts IPv4 address in its textual presentation form |
| * into its numeric binary form. |
| * |
| * @param src a String representing an IPv4 address in standard format |
| * @return a byte array representing the IPv4 numeric address |
| */ |
| @SuppressWarnings("fallthrough") |
| public static byte[] textToNumericFormatV4(String src) |
| { |
| byte[] res = new byte[INADDR4SZ]; |
| |
| long tmpValue = 0; |
| int currByte = 0; |
| boolean newOctet = true; |
| |
| int len = src.length(); |
| if (len == 0 || len > 15) { |
| return null; |
| } |
| /* |
| * When only one part is given, the value is stored directly in |
| * the network address without any byte rearrangement. |
| * |
| * When a two part address is supplied, the last part is |
| * interpreted as a 24-bit quantity and placed in the right |
| * most three bytes of the network address. This makes the |
| * two part address format convenient for specifying Class A |
| * network addresses as net.host. |
| * |
| * When a three part address is specified, the last part is |
| * interpreted as a 16-bit quantity and placed in the right |
| * most two bytes of the network address. This makes the |
| * three part address format convenient for specifying |
| * Class B net- work addresses as 128.net.host. |
| * |
| * When four parts are specified, each is interpreted as a |
| * byte of data and assigned, from left to right, to the |
| * four bytes of an IPv4 address. |
| * |
| * We determine and parse the leading parts, if any, as single |
| * byte values in one pass directly into the resulting byte[], |
| * then the remainder is treated as a 8-to-32-bit entity and |
| * translated into the remaining bytes in the array. |
| */ |
| for (int i = 0; i < len; i++) { |
| char c = src.charAt(i); |
| if (c == '.') { |
| if (newOctet || tmpValue < 0 || tmpValue > 0xff || currByte == 3) { |
| return null; |
| } |
| res[currByte++] = (byte) (tmpValue & 0xff); |
| tmpValue = 0; |
| newOctet = true; |
| } else { |
| int digit = Character.digit(c, 10); |
| if (digit < 0) { |
| return null; |
| } |
| tmpValue *= 10; |
| tmpValue += digit; |
| newOctet = false; |
| } |
| } |
| if (newOctet || tmpValue < 0 || tmpValue >= (1L << ((4 - currByte) * 8))) { |
| return null; |
| } |
| switch (currByte) { |
| // BEGIN Android-changed: Require all four parts to be given for an IPv4 address. |
| /* |
| case 0: |
| res[0] = (byte) ((tmpValue >> 24) & 0xff); |
| case 1: |
| res[1] = (byte) ((tmpValue >> 16) & 0xff); |
| case 2: |
| res[2] = (byte) ((tmpValue >> 8) & 0xff); |
| */ |
| case 0: |
| case 1: |
| case 2: |
| return null; |
| // END Android-changed: Require all four parts to be given for an IPv4 address. |
| case 3: |
| res[3] = (byte) ((tmpValue >> 0) & 0xff); |
| } |
| return res; |
| } |
| |
| /* |
| * Convert IPv6 presentation level address to network order binary form. |
| * credit: |
| * Converted from C code from Solaris 8 (inet_pton) |
| * |
| * Any component of the string following a per-cent % is ignored. |
| * |
| * @param src a String representing an IPv6 address in textual format |
| * @return a byte array representing the IPv6 numeric address |
| */ |
| public static byte[] textToNumericFormatV6(String src) |
| { |
| // Shortest valid string is "::", hence at least 2 chars |
| if (src.length() < 2) { |
| return null; |
| } |
| |
| int colonp; |
| char ch; |
| boolean saw_xdigit; |
| int val; |
| char[] srcb = src.toCharArray(); |
| byte[] dst = new byte[INADDR16SZ]; |
| |
| int srcb_length = srcb.length; |
| int pc = src.indexOf ("%"); |
| if (pc == srcb_length -1) { |
| return null; |
| } |
| |
| if (pc != -1) { |
| srcb_length = pc; |
| } |
| |
| colonp = -1; |
| int i = 0, j = 0; |
| /* Leading :: requires some special handling. */ |
| if (srcb[i] == ':') |
| if (srcb[++i] != ':') |
| return null; |
| int curtok = i; |
| saw_xdigit = false; |
| val = 0; |
| while (i < srcb_length) { |
| ch = srcb[i++]; |
| int chval = Character.digit(ch, 16); |
| if (chval != -1) { |
| val <<= 4; |
| val |= chval; |
| if (val > 0xffff) |
| return null; |
| saw_xdigit = true; |
| continue; |
| } |
| if (ch == ':') { |
| curtok = i; |
| if (!saw_xdigit) { |
| if (colonp != -1) |
| return null; |
| colonp = j; |
| continue; |
| } else if (i == srcb_length) { |
| return null; |
| } |
| if (j + INT16SZ > INADDR16SZ) |
| return null; |
| dst[j++] = (byte) ((val >> 8) & 0xff); |
| dst[j++] = (byte) (val & 0xff); |
| saw_xdigit = false; |
| val = 0; |
| continue; |
| } |
| if (ch == '.' && ((j + INADDR4SZ) <= INADDR16SZ)) { |
| String ia4 = src.substring(curtok, srcb_length); |
| /* check this IPv4 address has 3 dots, ie. A.B.C.D */ |
| int dot_count = 0, index=0; |
| while ((index = ia4.indexOf ('.', index)) != -1) { |
| dot_count ++; |
| index ++; |
| } |
| if (dot_count != 3) { |
| return null; |
| } |
| byte[] v4addr = textToNumericFormatV4(ia4); |
| if (v4addr == null) { |
| return null; |
| } |
| for (int k = 0; k < INADDR4SZ; k++) { |
| dst[j++] = v4addr[k]; |
| } |
| saw_xdigit = false; |
| break; /* '\0' was seen by inet_pton4(). */ |
| } |
| return null; |
| } |
| if (saw_xdigit) { |
| if (j + INT16SZ > INADDR16SZ) |
| return null; |
| dst[j++] = (byte) ((val >> 8) & 0xff); |
| dst[j++] = (byte) (val & 0xff); |
| } |
| |
| if (colonp != -1) { |
| int n = j - colonp; |
| |
| if (j == INADDR16SZ) |
| return null; |
| for (i = 1; i <= n; i++) { |
| dst[INADDR16SZ - i] = dst[colonp + n - i]; |
| dst[colonp + n - i] = 0; |
| } |
| j = INADDR16SZ; |
| } |
| if (j != INADDR16SZ) |
| return null; |
| byte[] newdst = convertFromIPv4MappedAddress(dst); |
| if (newdst != null) { |
| return newdst; |
| } else { |
| return dst; |
| } |
| } |
| |
| /** |
| * @param src a String representing an IPv4 address in textual format |
| * @return a boolean indicating whether src is an IPv4 literal address |
| */ |
| public static boolean isIPv4LiteralAddress(String src) { |
| return textToNumericFormatV4(src) != null; |
| } |
| |
| /** |
| * @param src a String representing an IPv6 address in textual format |
| * @return a boolean indicating whether src is an IPv6 literal address |
| */ |
| public static boolean isIPv6LiteralAddress(String src) { |
| return textToNumericFormatV6(src) != null; |
| } |
| |
| /* |
| * Convert IPv4-Mapped address to IPv4 address. Both input and |
| * returned value are in network order binary form. |
| * |
| * @param src a String representing an IPv4-Mapped address in textual format |
| * @return a byte array representing the IPv4 numeric address |
| */ |
| public static byte[] convertFromIPv4MappedAddress(byte[] addr) { |
| if (isIPv4MappedAddress(addr)) { |
| byte[] newAddr = new byte[INADDR4SZ]; |
| System.arraycopy(addr, 12, newAddr, 0, INADDR4SZ); |
| return newAddr; |
| } |
| return null; |
| } |
| |
| /** |
| * Utility routine to check if the InetAddress is an |
| * IPv4 mapped IPv6 address. |
| * |
| * @return a <code>boolean</code> indicating if the InetAddress is |
| * an IPv4 mapped IPv6 address; or false if address is IPv4 address. |
| */ |
| private static boolean isIPv4MappedAddress(byte[] addr) { |
| if (addr.length < INADDR16SZ) { |
| return false; |
| } |
| if ((addr[0] == 0x00) && (addr[1] == 0x00) && |
| (addr[2] == 0x00) && (addr[3] == 0x00) && |
| (addr[4] == 0x00) && (addr[5] == 0x00) && |
| (addr[6] == 0x00) && (addr[7] == 0x00) && |
| (addr[8] == 0x00) && (addr[9] == 0x00) && |
| (addr[10] == (byte)0xff) && |
| (addr[11] == (byte)0xff)) { |
| return true; |
| } |
| return false; |
| } |
| } |
