HaHaWTH
73 lines
2.5 KiB
Java
73 lines
2.5 KiB
Java
package fr.xephi.authme.util;
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import java.net.InetAddress;
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import java.net.UnknownHostException;
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/**
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* Utility class about the InternetProtocol
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*/
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public final class InternetProtocolUtils {
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// Utility class
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private InternetProtocolUtils() {
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}
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/**
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* Checks if the specified address is a private or loopback address
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*
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* @param address address to check
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* @return true if the address is a local (site and link) or loopback address, false otherwise
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*/
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public static boolean isLocalAddress(String address) {
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try {
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InetAddress inetAddress = InetAddress.getByName(address);
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// Examples: 127.0.0.1, localhost or [::1]
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return isLoopbackAddress(address)
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// Example: 10.0.0.0, 172.16.0.0, 192.168.0.0, fec0::/10 (deprecated)
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// Ref: https://en.wikipedia.org/wiki/IP_address#Private_addresses
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|| inetAddress.isSiteLocalAddress()
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// Example: 169.254.0.0/16, fe80::/10
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// Ref: https://en.wikipedia.org/wiki/IP_address#Address_autoconfiguration
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|| inetAddress.isLinkLocalAddress()
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// non deprecated unique site-local that java doesn't check yet -> fc00::/7
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|| isIPv6UniqueSiteLocal(inetAddress);
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} catch (UnknownHostException e) {
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return false;
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}
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}
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/**
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* Checks if the specified address is a loopback address. This can be one of the following:
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* <ul>
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* <li>127.0.0.1</li>
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* <li>localhost</li>
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* <li>[::1]</li>
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* </ul>
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*
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* @param address address to check
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* @return true if the address is a loopback one
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*/
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public static boolean isLoopbackAddress(String address) {
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try {
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InetAddress inetAddress = InetAddress.getByName(address);
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return inetAddress.isLoopbackAddress();
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} catch (UnknownHostException e) {
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return false;
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}
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}
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private static boolean isLoopbackAddress(InetAddress address) {
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return address.isLoopbackAddress();
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}
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private static boolean isIPv6UniqueSiteLocal(InetAddress address) {
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// ref: https://en.wikipedia.org/wiki/Unique_local_address
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// currently undefined but could be used in the near future fc00::/8
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return (address.getAddress()[0] & 0xFF) == 0xFC
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// in use for unique site-local fd00::/8
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|| (address.getAddress()[0] & 0xFF) == 0xFD;
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}
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}
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