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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;
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42
43 public class InetAddressUtils {
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50 public static final byte IPV4 = 1;
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56 public static final byte IPV6 = 4;
57
58 private InetAddressUtils() {
59 }
60
61 private static final String IPV4_BASIC_PATTERN_STRING =
62 "(([1-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){1}" +
63 "(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){2}" +
64 "([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])";
65
66 private static final Pattern IPV4_PATTERN =
67 Pattern.compile("^" + IPV4_BASIC_PATTERN_STRING + "$");
68
69 private static final Pattern IPV4_MAPPED_IPV6_PATTERN =
70 Pattern.compile("^::[fF]{4}:" + IPV4_BASIC_PATTERN_STRING + "$");
71
72 private static final Pattern IPV6_STD_PATTERN =
73 Pattern.compile(
74 "^[0-9a-fA-F]{1,4}(:[0-9a-fA-F]{1,4}){7}$");
75
76 private static final Pattern IPV6_HEX_COMPRESSED_PATTERN =
77 Pattern.compile(
78 "^(([0-9A-Fa-f]{1,4}(:[0-9A-Fa-f]{1,4}){0,5})?)" +
79 "::" +
80 "(([0-9A-Fa-f]{1,4}(:[0-9A-Fa-f]{1,4}){0,5})?)$");
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85 private static final char COLON_CHAR = ':';
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88 private static final int MAX_COLON_COUNT = 7;
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96 public static boolean isIPv4Address(final String input) {
97 return IPV4_PATTERN.matcher(input).matches();
98 }
99
100 public static boolean isIPv4MappedIPv64Address(final String input) {
101 return IPV4_MAPPED_IPV6_PATTERN.matcher(input).matches();
102 }
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110 public static boolean isIPv6StdAddress(final String input) {
111 return IPV6_STD_PATTERN.matcher(input).matches();
112 }
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120 public static boolean isIPv6HexCompressedAddress(final String input) {
121 int colonCount = 0;
122 for(int i = 0; i < input.length(); i++) {
123 if (input.charAt(i) == COLON_CHAR) {
124 colonCount++;
125 }
126 }
127 return colonCount <= MAX_COLON_COUNT && IPV6_HEX_COMPRESSED_PATTERN.matcher(input).matches();
128 }
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136 public static boolean isIPv6Address(final String input) {
137 return isIPv6StdAddress(input) || isIPv6HexCompressedAddress(input);
138 }
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144
145 public static void formatAddress(
146 final StringBuilder buffer,
147 final SocketAddress socketAddress) {
148 Args.notNull(buffer, "buffer");
149 if (socketAddress instanceof InetSocketAddress) {
150 final InetSocketAddress socketaddr = (InetSocketAddress) socketAddress;
151 final InetAddress inetaddr = socketaddr.getAddress();
152 if (inetaddr != null) {
153 buffer.append(inetaddr.getHostAddress()).append(':').append(socketaddr.getPort());
154 } else {
155 buffer.append(socketAddress);
156 }
157 } else {
158 buffer.append(socketAddress);
159 }
160 }
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167 public static String getCanonicalLocalHostName() {
168 try {
169 final InetAddress localHost = InetAddress.getLocalHost();
170 return localHost.getCanonicalHostName();
171 } catch (final UnknownHostException ex) {
172 return "localhost";
173 }
174 }
175
176 }