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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Copyright 2015 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.channel.unix;

import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;

/**
 * Internal usage only!
 */
public final class NativeInetAddress {
    private static final byte[] IPV4_MAPPED_IPV6_PREFIX = {
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, (byte) 0xff, (byte) 0xff };
    final byte[] address;
    final int scopeId;

    public static NativeInetAddress newInstance(InetAddress addr) {
        byte[] bytes = addr.getAddress();
        if (addr instanceof Inet6Address) {
            return new NativeInetAddress(bytes, ((Inet6Address) addr).getScopeId());
        } else {
            // convert to ipv4 mapped ipv6 address;
            return new NativeInetAddress(ipv4MappedIpv6Address(bytes));
        }
    }

    public NativeInetAddress(byte[] address, int scopeId) {
        this.address = address;
        this.scopeId = scopeId;
    }

    public NativeInetAddress(byte[] address) {
        this(address, 0);
    }

    public byte[] address() {
        return address;
    }

    public int scopeId() {
        return scopeId;
    }

    public static byte[] ipv4MappedIpv6Address(byte[] ipv4) {
        byte[] address = new byte[16];
        copyIpv4MappedIpv6Address(ipv4, address);
        return address;
    }

    public static void copyIpv4MappedIpv6Address(byte[] ipv4, byte[] ipv6) {
        System.arraycopy(IPV4_MAPPED_IPV6_PREFIX, 0, ipv6, 0, IPV4_MAPPED_IPV6_PREFIX.length);
        System.arraycopy(ipv4, 0, ipv6, 12, ipv4.length);
    }

    public static InetSocketAddress address(byte[] addr, int offset, int len) {
        // The last 4 bytes are always the port
        final int port = decodeInt(addr, offset + len - 4);
        final InetAddress address;
        try {
            switch (len) {
                // 8 bytes:
                // - 4  == ipaddress
                // - 4  == port
                case 8:
                    byte[] ipv4 = new byte[4];
                    System.arraycopy(addr, offset, ipv4, 0, 4);
                    address = InetAddress.getByAddress(ipv4);
                    break;

                // 24 bytes:
                // - 16  == ipaddress
                // - 4   == scopeId
                // - 4   == port
                case 24:
                    byte[] ipv6 = new byte[16];
                    System.arraycopy(addr, offset, ipv6, 0, 16);
                    int scopeId = decodeInt(addr, offset + len  - 8);
                    // Only include the scopeId if its either non 0 or if this is a link-local address
                    // as scopeId is only supported with it:
                    // See also https://man7.org/linux/man-pages/man7/ipv6.7.html
                    if (scopeId != 0 || (ipv6[0] == (byte) 0xfe && ipv6[1] == (byte) 0x80)) {
                        address = Inet6Address.getByAddress(null, ipv6, scopeId);
                    } else {
                        address = InetAddress.getByAddress(null, ipv6);
                    }
                    break;
                default:
                    throw new Error();
            }
            return new InetSocketAddress(address, port);
        } catch (UnknownHostException e) {
            throw new Error("Should never happen", e);
        }
    }

    static int decodeInt(byte[] addr, int index) {
        return  (addr[index]     & 0xff) << 24 |
                (addr[index + 1] & 0xff) << 16 |
                (addr[index + 2] & 0xff) <<  8 |
                addr[index + 3] & 0xff;
    }
}