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/*
* Copyright © 2017-2021 WireGuard LLC. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
package com.wireguard.config;
import com.wireguard.util.NonNullForAll;
import java.lang.reflect.Method;
import java.net.Inet4Address;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.regex.Pattern;
import androidx.annotation.Nullable;
/**
* Utility methods for creating instances of {@link InetAddress}.
*/
@NonNullForAll
public final class InetAddresses {
@Nullable private static final Method PARSER_METHOD;
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]?))$");
private static final Pattern VALID_HOSTNAME = Pattern.compile("^(?=.{1,255}$)[0-9A-Za-z](?:(?:[0-9A-Za-z]|-){0,61}[0-9A-Za-z])?(?:\\.[0-9A-Za-z](?:(?:[0-9A-Za-z]|-){0,61}[0-9A-Za-z])?)*\\.?$");
static {
Method m = null;
try {
if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.Q)
// noinspection JavaReflectionMemberAccess
m = InetAddress.class.getMethod("parseNumericAddress", String.class);
} catch (final Exception ignored) {
}
PARSER_METHOD = m;
}
private InetAddresses() {
}
/**
* Determines whether input is a valid DNS hostname.
*
* @param maybeHostname a string that is possibly a DNS hostname
* @return whether or not maybeHostname is a valid DNS hostname
*/
public static boolean isHostname(final CharSequence maybeHostname) {
return VALID_HOSTNAME.matcher(maybeHostname).matches();
}
/**
* Parses a numeric IPv4 or IPv6 address without performing any DNS lookups.
*
* @param address a string representing the IP address
* @return an instance of {@link Inet4Address} or {@link Inet6Address}, as appropriate
*/
public static InetAddress parse(final String address) throws ParseException {
if (address.isEmpty())
throw new ParseException(InetAddress.class, address, "Empty address");
try {
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.Q)
return android.net.InetAddresses.parseNumericAddress(address);
else if (PARSER_METHOD != null)
return (InetAddress) PARSER_METHOD.invoke(null, address);
else
throw new NoSuchMethodException("parseNumericAddress");
} catch (final IllegalArgumentException e) {
throw new ParseException(InetAddress.class, address, e);
} catch (final Exception e) {
final Throwable cause = e.getCause();
// Re-throw parsing exceptions with the original type, as callers might try to catch
// them. On the other hand, callers cannot be expected to handle reflection failures.
if (cause instanceof IllegalArgumentException)
throw new ParseException(InetAddress.class, address, cause);
try {
if (WONT_TOUCH_RESOLVER.matcher(address).matches())
return InetAddress.getByName(address);
else
throw new ParseException(InetAddress.class, address, "Not an IP address");
} catch (final UnknownHostException f) {
throw new ParseException(InetAddress.class, address, f);
}
}
}
}
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