1 /*
2 * ====================================================================
3 * Licensed to the Apache Software Foundation (ASF) under one
4 * or more contributor license agreements. See the NOTICE file
5 * distributed with this work for additional information
6 * regarding copyright ownership. The ASF licenses this file
7 * to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance
9 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing,
14 * software distributed under the License is distributed on an
15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16 * KIND, either express or implied. See the License for the
17 * specific language governing permissions and limitations
18 * under the License.
19 * ====================================================================
20 *
21 * This software consists of voluntary contributions made by many
22 * individuals on behalf of the Apache Software Foundation. For more
23 * information on the Apache Software Foundation, please see
24 * <http://www.apache.org/>.
25 *
26 */
27
28 package org.apache.http.conn.util;
29
30 import java.util.regex.Pattern;
31
32 import org.apache.http.annotation.Immutable;
33
34 /**
35 * A collection of utilities relating to InetAddresses.
36 *
37 * @since 4.0
38 */
39 @Immutable
40 public class InetAddressUtils {
41
42 private InetAddressUtils() {
43 }
44
45 private static final Pattern IPV4_PATTERN =
46 Pattern.compile(
47 "^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$");
48
49 private static final Pattern IPV6_STD_PATTERN =
50 Pattern.compile(
51 "^(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}$");
52
53 private static final Pattern IPV6_HEX_COMPRESSED_PATTERN =
54 Pattern.compile(
55 "^((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)::((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)$");
56
57 /*
58 * The above pattern is not totally rigorous as it allows for more than 7 hex fields in total
59 */
60 private static final char COLON_CHAR = ':';
61
62 // Must not have more than 7 colons (i.e. 8 fields)
63 private static final int MAX_COLON_COUNT = 7;
64
65 /**
66 * Checks whether the parameter is a valid IPv4 address
67 *
68 * @param input the address string to check for validity
69 * @return true if the input parameter is a valid IPv4 address
70 */
71 public static boolean isIPv4Address(final String input) {
72 return IPV4_PATTERN.matcher(input).matches();
73 }
74
75 /**
76 * Checks whether the parameter is a valid standard (non-compressed) IPv6 address
77 *
78 * @param input the address string to check for validity
79 * @return true if the input parameter is a valid standard (non-compressed) IPv6 address
80 */
81 public static boolean isIPv6StdAddress(final String input) {
82 return IPV6_STD_PATTERN.matcher(input).matches();
83 }
84
85 /**
86 * Checks whether the parameter is a valid compressed IPv6 address
87 *
88 * @param input the address string to check for validity
89 * @return true if the input parameter is a valid compressed IPv6 address
90 */
91 public static boolean isIPv6HexCompressedAddress(final String input) {
92 int colonCount = 0;
93 for(int i = 0; i < input.length(); i++) {
94 if (input.charAt(i) == COLON_CHAR) {
95 colonCount++;
96 }
97 }
98 return colonCount <= MAX_COLON_COUNT && IPV6_HEX_COMPRESSED_PATTERN.matcher(input).matches();
99 }
100
101 /**
102 * Checks whether the parameter is a valid IPv6 address (including compressed).
103 *
104 * @param input the address string to check for validity
105 * @return true if the input parameter is a valid standard or compressed IPv6 address
106 */
107 public static boolean isIPv6Address(final String input) {
108 return isIPv6StdAddress(input) || isIPv6HexCompressedAddress(input);
109 }
110
111 }