72 lines
3.9 KiB
Java
72 lines
3.9 KiB
Java
/*
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* Copyright © 2017-2019 WireGuard LLC. All Rights Reserved.
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* SPDX-License-Identifier: Apache-2.0
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*/
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package com.wireguard.config;
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import java.lang.reflect.Method;
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import java.net.Inet4Address;
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import java.net.Inet6Address;
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import java.net.InetAddress;
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import java.net.UnknownHostException;
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import java.util.regex.Pattern;
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import javax.annotation.Nullable;
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/**
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* Utility methods for creating instances of {@link InetAddress}.
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*/
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public final class InetAddresses {
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@Nullable private static final Method PARSER_METHOD;
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private static final Pattern WONT_TOUCH_RESOLVER = Pattern.compile("^(((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){5}(((:[0-9A-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){4}(((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){3}(((:[0-9A-Fa-f]{1,4}){1,4})|((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}(((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3}))|:))|(:(((:[0-9A-Fa-f]{1,4}){1,7})|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3}))|:)))(%.+)?)|((?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))$");
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static {
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Method m = null;
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try {
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if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.Q)
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// noinspection JavaReflectionMemberAccess
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m = InetAddress.class.getMethod("parseNumericAddress", String.class);
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} catch (final Exception ignored) {
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}
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PARSER_METHOD = m;
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}
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private InetAddresses() { }
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/**
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* Parses a numeric IPv4 or IPv6 address without performing any DNS lookups.
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*
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* @param address a string representing the IP address
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* @return an instance of {@link Inet4Address} or {@link Inet6Address}, as appropriate
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*/
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public static InetAddress parse(final String address) throws ParseException {
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if (address.isEmpty())
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throw new ParseException(InetAddress.class, address, "Empty address");
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try {
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if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.Q)
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return android.net.InetAddresses.parseNumericAddress(address);
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else if (PARSER_METHOD != null)
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return (InetAddress) PARSER_METHOD.invoke(null, address);
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else
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throw new NoSuchMethodException("parseNumericAddress");
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} catch (final IllegalArgumentException e) {
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throw new ParseException(InetAddress.class, address, e);
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} catch (final Exception e) {
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final Throwable cause = e.getCause();
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// Re-throw parsing exceptions with the original type, as callers might try to catch
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// them. On the other hand, callers cannot be expected to handle reflection failures.
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if (cause instanceof IllegalArgumentException)
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throw new ParseException(InetAddress.class, address, cause);
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try {
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if (WONT_TOUCH_RESOLVER.matcher(address).matches())
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return InetAddress.getByName(address);
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else
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throw new ParseException(InetAddress.class, address, "Not an IP address");
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} catch (final UnknownHostException f) {
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throw new ParseException(InetAddress.class, address, f);
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}
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}
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}
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}
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