001/* 002 * ==================================================================== 003 * Licensed to the Apache Software Foundation (ASF) under one 004 * or more contributor license agreements. See the NOTICE file 005 * distributed with this work for additional information 006 * regarding copyright ownership. The ASF licenses this file 007 * to you under the Apache License, Version 2.0 (the 008 * "License"); you may not use this file except in compliance 009 * with the License. You may obtain a copy of the License at 010 * 011 * http://www.apache.org/licenses/LICENSE-2.0 012 * 013 * Unless required by applicable law or agreed to in writing, 014 * software distributed under the License is distributed on an 015 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 016 * KIND, either express or implied. See the License for the 017 * specific language governing permissions and limitations 018 * under the License. 019 * ==================================================================== 020 * 021 * This software consists of voluntary contributions made by many 022 * individuals on behalf of the Apache Software Foundation. For more 023 * information on the Apache Software Foundation, please see 024 * <http://www.apache.org/>. 025 * 026 */ 027 028package org.apache.http.conn.util; 029 030import java.util.regex.Pattern; 031 032/** 033 * A collection of utilities relating to InetAddresses. 034 * 035 * @since 4.0 036 */ 037public class InetAddressUtils { 038 039 private InetAddressUtils() { 040 } 041 042 private static final String IPV4_BASIC_PATTERN_STRING = 043 "(([1-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){1}" + // initial first field, 1-255 044 "(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){2}" + // following 2 fields, 0-255 followed by . 045 "([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])"; // final field, 0-255 046 047 private static final Pattern IPV4_PATTERN = 048 Pattern.compile("^" + IPV4_BASIC_PATTERN_STRING + "$"); 049 050 private static final Pattern IPV4_MAPPED_IPV6_PATTERN = // TODO does not allow for redundant leading zeros 051 Pattern.compile("^::[fF]{4}:" + IPV4_BASIC_PATTERN_STRING + "$"); 052 053 private static final Pattern IPV6_STD_PATTERN = 054 Pattern.compile( 055 "^[0-9a-fA-F]{1,4}(:[0-9a-fA-F]{1,4}){7}$"); 056 057 private static final Pattern IPV6_HEX_COMPRESSED_PATTERN = 058 Pattern.compile( 059 "^(([0-9A-Fa-f]{1,4}(:[0-9A-Fa-f]{1,4}){0,5})?)" + // 0-6 hex fields 060 "::" + 061 "(([0-9A-Fa-f]{1,4}(:[0-9A-Fa-f]{1,4}){0,5})?)$"); // 0-6 hex fields 062 063 /* 064 * The above pattern is not totally rigorous as it allows for more than 7 hex fields in total 065 */ 066 private static final char COLON_CHAR = ':'; 067 068 // Must not have more than 7 colons (i.e. 8 fields) 069 private static final int MAX_COLON_COUNT = 7; 070 071 /** 072 * Checks whether the parameter is a valid IPv4 address 073 * 074 * @param input the address string to check for validity 075 * @return true if the input parameter is a valid IPv4 address 076 */ 077 public static boolean isIPv4Address(final String input) { 078 return IPV4_PATTERN.matcher(input).matches(); 079 } 080 081 public static boolean isIPv4MappedIPv64Address(final String input) { 082 return IPV4_MAPPED_IPV6_PATTERN.matcher(input).matches(); 083 } 084 085 /** 086 * Checks whether the parameter is a valid standard (non-compressed) IPv6 address 087 * 088 * @param input the address string to check for validity 089 * @return true if the input parameter is a valid standard (non-compressed) IPv6 address 090 */ 091 public static boolean isIPv6StdAddress(final String input) { 092 return IPV6_STD_PATTERN.matcher(input).matches(); 093 } 094 095 /** 096 * Checks whether the parameter is a valid compressed IPv6 address 097 * 098 * @param input the address string to check for validity 099 * @return true if the input parameter is a valid compressed IPv6 address 100 */ 101 public static boolean isIPv6HexCompressedAddress(final String input) { 102 int colonCount = 0; 103 for(int i = 0; i < input.length(); i++) { 104 if (input.charAt(i) == COLON_CHAR) { 105 colonCount++; 106 } 107 } 108 return colonCount <= MAX_COLON_COUNT && IPV6_HEX_COMPRESSED_PATTERN.matcher(input).matches(); 109 } 110 111 /** 112 * Checks whether the parameter is a valid IPv6 address (including compressed). 113 * 114 * @param input the address string to check for validity 115 * @return true if the input parameter is a valid standard or compressed IPv6 address 116 */ 117 public static boolean isIPv6Address(final String input) { 118 return isIPv6StdAddress(input) || isIPv6HexCompressedAddress(input); 119 } 120 121}