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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 2020 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.handler.pcap;

import io.netty.buffer.ByteBuf;

final class EthernetPacket {

    /**
     * MAC Address: 00:00:5E:00:53:00
     */
    private static final byte[] DUMMY_SOURCE_MAC_ADDRESS = new byte[]{0, 0, 94, 0, 83, 0};

    /**
     * MAC Address: 00:00:5E:00:53:FF
     */
    private static final byte[] DUMMY_DESTINATION_MAC_ADDRESS = new byte[]{0, 0, 94, 0, 83, -1};

    /**
     * IPv4
     */
    private static final int V4 = 0x0800;

    /**
     * IPv6
     */
    private static final int V6 = 0x86dd;

    private EthernetPacket() {
        // Prevent outside initialization
    }

    /**
     * Write IPv4 Ethernet Packet. It uses a dummy MAC address for both source and destination.
     *
     * @param byteBuf ByteBuf where Ethernet Packet data will be set
     * @param payload Payload of IPv4
     */
    static void writeIPv4(ByteBuf byteBuf, ByteBuf payload) {
        EthernetPacket.writePacket(byteBuf, payload, DUMMY_SOURCE_MAC_ADDRESS, DUMMY_DESTINATION_MAC_ADDRESS, V4);
    }

    /**
     * Write IPv6 Ethernet Packet. It uses a dummy MAC address for both source and destination.
     *
     * @param byteBuf ByteBuf where Ethernet Packet data will be set
     * @param payload Payload of IPv6
     */
    static void writeIPv6(ByteBuf byteBuf, ByteBuf payload) {
        EthernetPacket.writePacket(byteBuf, payload, DUMMY_SOURCE_MAC_ADDRESS, DUMMY_DESTINATION_MAC_ADDRESS, V6);
    }

    /**
     * Write IPv6 Ethernet Packet
     *
     * @param byteBuf    ByteBuf where Ethernet Packet data will be set
     * @param payload    Payload of IPv6
     * @param srcAddress Source MAC Address
     * @param dstAddress Destination MAC Address
     * @param type       Type of Frame
     */
    private static void writePacket(ByteBuf byteBuf, ByteBuf payload, byte[] srcAddress, byte[] dstAddress, int type) {
        byteBuf.writeBytes(dstAddress); // Destination MAC Address
        byteBuf.writeBytes(srcAddress); // Source MAC Address
        byteBuf.writeShort(type);       // Frame Type (IPv4 or IPv6)
        byteBuf.writeBytes(payload);    // Payload of L3
    }
}