Here you can find the source of isIPv6LiteralAddress(String src)
| Parameter | Description |
|---|---|
| src | a String representing an IPv6 address in textual format |
public static boolean isIPv6LiteralAddress(String src)
//package com.java2s; /*// ww w.jav a2 s .co m * #%L * Xacml4J Core Engine Implementation * %% * Copyright (C) 2009 - 2014 Xacml4J.org * %% * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation, either version 3 of the * License, or (at your option) any later version. * * This program 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 Lesser Public License for more details. * * You should have received a copy of the GNU General Lesser Public * License along with this program. If not, see * <http://www.gnu.org/licenses/lgpl-3.0.html>. * #L% */ import java.util.regex.Pattern; public class Main { private final static int INADDR4SZ = 4; private final static int INADDR16SZ = 16; private final static int INT16SZ = 2; private static final Pattern DOT_PATTERN = Pattern.compile("\\."); /** * @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; } 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; } } public static byte[] textToNumericFormatV4(String src) { if (src.length() == 0) { return null; } byte[] res = new byte[INADDR4SZ]; String[] s = DOT_PATTERN.split(src, -1); long val; try { switch (s.length) { case 1: /* * When only one part is given, the value is stored directly in * the network address without any byte rearrangement. */ val = Long.parseLong(s[0]); if (val < 0 || val > 0xffffffffL) return null; res[0] = (byte) ((val >> 24) & 0xff); res[1] = (byte) (((val & 0xffffff) >> 16) & 0xff); res[2] = (byte) (((val & 0xffff) >> 8) & 0xff); res[3] = (byte) (val & 0xff); break; case 2: /* * 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. */ val = Integer.parseInt(s[0]); if (val < 0 || val > 0xff) return null; res[0] = (byte) (val & 0xff); val = Integer.parseInt(s[1]); if (val < 0 || val > 0xffffff) return null; res[1] = (byte) ((val >> 16) & 0xff); res[2] = (byte) (((val & 0xffff) >> 8) & 0xff); res[3] = (byte) (val & 0xff); break; case 3: /* * 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. */ for (int i = 0; i < 2; i++) { val = Integer.parseInt(s[i]); if (val < 0 || val > 0xff) return null; res[i] = (byte) (val & 0xff); } val = Integer.parseInt(s[2]); if (val < 0 || val > 0xffff) return null; res[2] = (byte) ((val >> 8) & 0xff); res[3] = (byte) (val & 0xff); break; case 4: /* * 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. */ for (int i = 0; i < 4; i++) { val = Integer.parseInt(s[i]); if (val < 0 || val > 0xff) return null; res[i] = (byte) (val & 0xff); } break; default: return null; } } catch (NumberFormatException e) { return null; } return res; } 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} 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; } return (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); } }