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28 package org.apache.hc.core5.net;
29
30 import java.net.InetAddress;
31 import java.net.InetSocketAddress;
32 import java.net.SocketAddress;
33 import java.net.UnknownHostException;
34 import java.util.regex.Pattern;
35
36 import org.apache.hc.core5.util.Args;
37
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42
43 public class InetAddressUtils {
44
45 private InetAddressUtils() {
46 }
47
48 private static final String IPV4_BASIC_PATTERN_STRING =
49 "(([1-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){1}" +
50 "(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){2}" +
51 "([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])";
52
53 private static final Pattern IPV4_PATTERN =
54 Pattern.compile("^" + IPV4_BASIC_PATTERN_STRING + "$");
55
56 private static final Pattern IPV4_MAPPED_IPV6_PATTERN =
57 Pattern.compile("^::[fF]{4}:" + IPV4_BASIC_PATTERN_STRING + "$");
58
59 private static final Pattern IPV6_STD_PATTERN =
60 Pattern.compile(
61 "^[0-9a-fA-F]{1,4}(:[0-9a-fA-F]{1,4}){7}$");
62
63 private static final Pattern IPV6_HEX_COMPRESSED_PATTERN =
64 Pattern.compile(
65 "^(([0-9A-Fa-f]{1,4}(:[0-9A-Fa-f]{1,4}){0,5})?)" +
66 "::" +
67 "(([0-9A-Fa-f]{1,4}(:[0-9A-Fa-f]{1,4}){0,5})?)$");
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72 private static final char COLON_CHAR = ':';
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75 private static final int MAX_COLON_COUNT = 7;
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83 public static boolean isIPv4Address(final String input) {
84 return IPV4_PATTERN.matcher(input).matches();
85 }
86
87 public static boolean isIPv4MappedIPv64Address(final String input) {
88 return IPV4_MAPPED_IPV6_PATTERN.matcher(input).matches();
89 }
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97 public static boolean isIPv6StdAddress(final String input) {
98 return IPV6_STD_PATTERN.matcher(input).matches();
99 }
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107 public static boolean isIPv6HexCompressedAddress(final String input) {
108 int colonCount = 0;
109 for(int i = 0; i < input.length(); i++) {
110 if (input.charAt(i) == COLON_CHAR) {
111 colonCount++;
112 }
113 }
114 return colonCount <= MAX_COLON_COUNT && IPV6_HEX_COMPRESSED_PATTERN.matcher(input).matches();
115 }
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123 public static boolean isIPv6Address(final String input) {
124 return isIPv6StdAddress(input) || isIPv6HexCompressedAddress(input);
125 }
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131
132 public static void formatAddress(
133 final StringBuilder buffer,
134 final SocketAddress socketAddress) {
135 Args.notNull(buffer, "buffer");
136 if (socketAddress instanceof InetSocketAddress) {
137 final InetSocketAddress socketaddr = (InetSocketAddress) socketAddress;
138 final InetAddress inetaddr = socketaddr.getAddress();
139 if (inetaddr != null) {
140 buffer.append(inetaddr.getHostAddress()).append(':').append(socketaddr.getPort());
141 } else {
142 buffer.append(socketAddress);
143 }
144 } else {
145 buffer.append(socketAddress);
146 }
147 }
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153
154 public static String getCanonicalLocalHostName() {
155 try {
156 final InetAddress localHost = InetAddress.getLocalHost();
157 return localHost.getCanonicalHostName();
158 } catch (final UnknownHostException ex) {
159 return "localhost";
160 }
161 }
162
163 }