org.pcap4j.packet.IcmpV6PacketTooBigPacket Maven / Gradle / Ivy

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/*_##########################################################################
  _##
  _##  Copyright (C) 2012-2014  Pcap4J.org
  _##
  _##########################################################################
*/

package org.pcap4j.packet;

import static org.pcap4j.util.ByteArrays.*;

import java.util.ArrayList;
import java.util.List;
import org.pcap4j.util.ByteArrays;

/**
 * @author Kaito Yamada
 * @since pcap4j 0.9.15
 */
public final class IcmpV6PacketTooBigPacket extends IcmpV6InvokingPacketPacket {

  /** */
  private static final long serialVersionUID = -8558258364388627250L;

  private final IcmpV6PacketTooBigHeader header;

  /**
   * A static factory method. This method validates the arguments by {@link
   * ByteArrays#validateBounds(byte[], int, int)}, which may throw exceptions undocumented here.
   *
   * @param rawData rawData
   * @param offset offset
   * @param length length
   * @return a new IcmpV6PacketTooBigPacket object.
   * @throws IllegalRawDataException if parsing the raw data fails.
   */
  public static IcmpV6PacketTooBigPacket newPacket(byte[] rawData, int offset, int length)
      throws IllegalRawDataException {
    ByteArrays.validateBounds(rawData, offset, length);

    IcmpV6PacketTooBigHeader header = new IcmpV6PacketTooBigHeader(rawData, offset, length);

    int payloadLength = length - header.length();
    if (payloadLength > 0) {
      return new IcmpV6PacketTooBigPacket(header, rawData, offset + header.length(), payloadLength);
    } else {
      return new IcmpV6PacketTooBigPacket(header);
    }
  }

  private IcmpV6PacketTooBigPacket(IcmpV6PacketTooBigHeader header) {
    this.header = header;
  }

  private IcmpV6PacketTooBigPacket(
      IcmpV6PacketTooBigHeader header, byte[] rawData, int payloadOffset, int payloadLength) {
    super(rawData, payloadOffset, payloadLength);
    this.header = header;
  }

  private IcmpV6PacketTooBigPacket(Builder builder) {
    super(builder);
    this.header = new IcmpV6PacketTooBigHeader(builder);
  }

  @Override
  public IcmpV6PacketTooBigHeader getHeader() {
    return header;
  }

  @Override
  public Builder getBuilder() {
    return new Builder(this);
  }

  /**
   * @author Kaito Yamada
   * @since pcap4j 0.9.15
   */
  public static final class Builder extends org.pcap4j.packet.IcmpV6InvokingPacketPacket.Builder {

    private int mtu;

    /** */
    public Builder() {}

    private Builder(IcmpV6PacketTooBigPacket packet) {
      super(packet);
      this.mtu = packet.getHeader().mtu;
    }

    /**
     * @param mtu mtu
     * @return this Builder object for method chaining.
     */
    public Builder mtu(int mtu) {
      this.mtu = mtu;
      return this;
    }

    @Override
    public Builder payload(Packet payload) {
      super.payload(payload);
      return this;
    }

    @Override
    public IcmpV6PacketTooBigPacket build() {
      return new IcmpV6PacketTooBigPacket(this);
    }
  }

  /**
   * @author Kaito Yamada
   * @since pcap4j 0.9.15
   */
  public static final class IcmpV6PacketTooBigHeader extends AbstractHeader {

    /*
     *   0                            15                              31
     *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     *  |                             MTU                               |
     *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     *
     */

    /** */
    private static final long serialVersionUID = 8034982803428261280L;

    private static final int MTU_OFFSET = 0;
    private static final int MTU_SIZE = INT_SIZE_IN_BYTES;
    private static final int ICMPV6_PACKET_TOO_BIG_HEADER_SIZE = MTU_OFFSET + MTU_SIZE;

    private final int mtu;

    private IcmpV6PacketTooBigHeader(byte[] rawData, int offset, int length)
        throws IllegalRawDataException {
      if (length < ICMPV6_PACKET_TOO_BIG_HEADER_SIZE) {
        StringBuilder sb = new StringBuilder(80);
        sb.append("The data is too short to build an ICMPv6 Packet Too Big Header(")
            .append(ICMPV6_PACKET_TOO_BIG_HEADER_SIZE)
            .append(" bytes). data: ")
            .append(ByteArrays.toHexString(rawData, " "))
            .append(", offset: ")
            .append(offset)
            .append(", length: ")
            .append(length);
        throw new IllegalRawDataException(sb.toString());
      }

      this.mtu = ByteArrays.getInt(rawData, MTU_OFFSET + offset);
    }

    private IcmpV6PacketTooBigHeader(Builder builder) {
      this.mtu = builder.mtu;
    }

    /** @return mtu */
    public int getMtu() {
      return mtu;
    }

    /** @return mtu */
    public long getMtuAsLong() {
      return mtu & 0xFFFFFFFFL;
    }

    @Override
    protected List getRawFields() {
      List rawFields = new ArrayList();
      rawFields.add(ByteArrays.toByteArray(mtu));
      return rawFields;
    }

    @Override
    public int length() {
      return ICMPV6_PACKET_TOO_BIG_HEADER_SIZE;
    }

    @Override
    protected String buildString() {
      StringBuilder sb = new StringBuilder();
      String ls = System.getProperty("line.separator");

      sb.append("[ICMPv6 Packet Too Big Header (").append(length()).append(" bytes)]").append(ls);
      sb.append("  MTU: ").append(mtu).append(ls);
      return sb.toString();
    }

    @Override
    public boolean equals(Object obj) {
      if (obj == this) {
        return true;
      }
      if (!this.getClass().isInstance(obj)) {
        return false;
      }

      IcmpV6PacketTooBigHeader other = (IcmpV6PacketTooBigHeader) obj;
      return mtu == other.mtu;
    }

    @Override
    protected int calcHashCode() {
      int result = 17;
      result = 31 * result + mtu;
      return result;
    }
  }
}