org.pcap4j.packet.IcmpV4DestinationUnreachablePacket Maven / Gradle / Ivy

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The core module of Pcap4J.
There is a newer version: 2.0.0-alpha.6
/*_##########################################################################
  _##
  _##  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 0.9.11
 */
public final class IcmpV4DestinationUnreachablePacket extends IcmpV4InvokingPacketPacket {

  /** */
  private static final long serialVersionUID = 2435425895590241470L;

  private final IcmpV4DestinationUnreachableHeader 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 IcmpV4DestinationUnreachablePacket object.
   * @throws IllegalRawDataException if parsing the raw data fails.
   */
  public static IcmpV4DestinationUnreachablePacket newPacket(byte[] rawData, int offset, int length)
      throws IllegalRawDataException {
    ByteArrays.validateBounds(rawData, offset, length);

    IcmpV4DestinationUnreachableHeader header =
        new IcmpV4DestinationUnreachableHeader(rawData, offset, length);

    int payloadLength = length - header.length();
    if (payloadLength > 0) {
      return new IcmpV4DestinationUnreachablePacket(
          header, rawData, offset + header.length(), payloadLength);
    } else {
      return new IcmpV4DestinationUnreachablePacket(header);
    }
  }

  private IcmpV4DestinationUnreachablePacket(IcmpV4DestinationUnreachableHeader header) {
    this.header = header;
  }

  private IcmpV4DestinationUnreachablePacket(
      IcmpV4DestinationUnreachableHeader header,
      byte[] rawData,
      int payloadOffset,
      int payloadLength) {
    super(rawData, payloadOffset, payloadLength);
    this.header = header;
  }

  private IcmpV4DestinationUnreachablePacket(Builder builder) {
    super(builder);
    this.header = new IcmpV4DestinationUnreachableHeader(builder);
  }

  @Override
  public IcmpV4DestinationUnreachableHeader getHeader() {
    return header;
  }

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

  /**
   * @author Kaito Yamada
   * @since pcap4j 0.9.11
   */
  public static final class Builder extends org.pcap4j.packet.IcmpV4InvokingPacketPacket.Builder {

    private int unused;

    /** */
    public Builder() {}

    private Builder(IcmpV4DestinationUnreachablePacket packet) {
      super(packet);
      this.unused = packet.getHeader().unused;
    }

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

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

    @Override
    public IcmpV4DestinationUnreachablePacket build() {
      return new IcmpV4DestinationUnreachablePacket(this);
    }
  }

  /**
   * @author Kaito Yamada
   * @since pcap4j 0.9.11
   */
  public static final class IcmpV4DestinationUnreachableHeader extends AbstractHeader {

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

    /** */
    private static final long serialVersionUID = 5245447443272345197L;

    private static final int UNUSED_OFFSET = 0;
    private static final int UNUSED_SIZE = INT_SIZE_IN_BYTES;
    private static final int ICMPV4_DESTINATION_UNREACHABLE_HEADER_SIZE =
        UNUSED_OFFSET + UNUSED_SIZE;

    private final int unused;

    private IcmpV4DestinationUnreachableHeader(byte[] rawData, int offset, int length)
        throws IllegalRawDataException {
      if (length < ICMPV4_DESTINATION_UNREACHABLE_HEADER_SIZE) {
        StringBuilder sb = new StringBuilder(80);
        sb.append("The data is too short to build an ICMPv4 Destination Unreachable Header(")
            .append(ICMPV4_DESTINATION_UNREACHABLE_HEADER_SIZE)
            .append(" bytes). data: ")
            .append(ByteArrays.toHexString(rawData, " "))
            .append(", offset: ")
            .append(offset)
            .append(", length: ")
            .append(length);
        throw new IllegalRawDataException(sb.toString());
      }

      this.unused = ByteArrays.getInt(rawData, UNUSED_OFFSET + offset);
    }

    private IcmpV4DestinationUnreachableHeader(Builder builder) {
      this.unused = builder.unused;
    }

    /** @return unused */
    public int getUnused() {
      return unused;
    }

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

    @Override
    public int length() {
      return ICMPV4_DESTINATION_UNREACHABLE_HEADER_SIZE;
    }

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

      sb.append("[ICMPv4 Destination Unreachable Header (")
          .append(length())
          .append(" bytes)]")
          .append(ls);
      sb.append("  Unused: ").append(unused).append(ls);
      return sb.toString();
    }

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

      IcmpV4DestinationUnreachableHeader other = (IcmpV4DestinationUnreachableHeader) obj;
      return unused == other.unused;
    }

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