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The core module of Pcap4J.
There is a newer version: 2.0.0-alpha.6
/*_##########################################################################
  _##
  _##  Copyright (C) 2014  Pcap4J.org
  _##
  _##########################################################################
*/

package org.pcap4j.packet;

import java.io.ObjectStreamException;
import java.util.ArrayList;
import java.util.List;
import org.pcap4j.packet.namednumber.Ssh2MessageNumber;
import org.pcap4j.util.ByteArrays;

/**
 * @author Kaito Yamada
 * @since pcap4j 1.0.1
 */
public final class Ssh2NewKeysPacket extends AbstractPacket {

  /**
   *
   */
  private static final long serialVersionUID = -4355029035065046101L;

  private static final Ssh2NewKeysPacket INSTANCE = new Ssh2NewKeysPacket();

  private final Ssh2NewKeysHeader header = Ssh2NewKeysHeader.getInstance();

  private Ssh2NewKeysPacket() {}

  /**
   * @return the singleton instance of Ssh2NewKeysPacket.
   */
  public static Ssh2NewKeysPacket getInstance() { return INSTANCE; }

  /**
   * 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 the singleton instance of Ssh2NewKeysPacket.
   * @throws IllegalRawDataException if parsing the raw data fails.
   */
  public static Ssh2NewKeysPacket newPacket(
    byte[] rawData, int offset, int length
  ) throws IllegalRawDataException {
    ByteArrays.validateBounds(rawData, offset, length);
    Ssh2NewKeysHeader.checkRawData(rawData, offset, length);
    return INSTANCE;
  }

  @Override
  public Ssh2NewKeysHeader getHeader() {
    return header;
  }

  @Override
  public Builder getBuilder() {
    throw new UnsupportedOperationException();
  }

  @Override
  public boolean equals(Object obj) {
    return ((Object)this).equals(obj);
  }

  @Override
  protected int calcHashCode() {
    return ((Object)this).hashCode();
  }

  // Override deserializer to keep singleton
  @SuppressWarnings("static-method")
  private Object readResolve() throws ObjectStreamException {
    return INSTANCE;
  }

  /**
   *
   * @author Kaito Yamada
   * @version pcap4j 1.0.1
   */
  public static final class Ssh2NewKeysHeader extends AbstractHeader {

    /*
     * http://tools.ietf.org/html/rfc4253
     *
     * byte      SSH_MSG_NEWKEYS
     */

    /**
     *
     */
    private static final long serialVersionUID = -6964593795610286838L;

    private static final Ssh2NewKeysHeader INSTANCE = new Ssh2NewKeysHeader();

    private final Ssh2MessageNumber messageNumber = Ssh2MessageNumber.SSH_MSG_NEWKEYS;

    private Ssh2NewKeysHeader() {}

    private static void checkRawData(
      byte[] rawData, int offset, int length
    ) throws IllegalRawDataException {
      if (length < 1) {
        StringBuilder sb = new StringBuilder(120);
        sb.append("The data is too short to build an SSH2 New Keys header. data: ")
          .append(new String(rawData))
          .append(", offset: ")
          .append(offset)
          .append(", length: ")
          .append(length);
        throw new IllegalRawDataException(sb.toString());
      }

      if (
        !Ssh2MessageNumber.getInstance(rawData[offset])
          .equals(Ssh2MessageNumber.SSH_MSG_KEXINIT)
      ) {
        StringBuilder sb = new StringBuilder(120);
        sb.append("The data is not an SSH2 New Keys message. data: ")
          .append(new String(rawData))
          .append(", offset: ")
          .append(offset)
          .append(", length: ")
          .append(length);
        throw new IllegalRawDataException(sb.toString());
      }
    }

    private static Ssh2NewKeysHeader getInstance() { return INSTANCE; }

    /**
     *
     * @return messageNumber
     */
    public Ssh2MessageNumber getMessageNumber() {
      return messageNumber;
    }

    @Override
    protected List getRawFields() {
      List rawFields = new ArrayList();
      rawFields.add(new byte[] {messageNumber.value()});
      return rawFields;
    }

    @Override
    public int length() { return 1; }

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

      sb.append("[SSH2 New Keys Header (")
        .append(length())
        .append(" bytes)]")
        .append(ls);
      sb.append("  Message Number: ")
        .append(messageNumber)
        .append(ls);

      return sb.toString();
    }

    @Override
    public boolean equals(Object obj) {
      return ((Object)this).equals(obj);
    }

    @Override
    protected int calcHashCode() {
      return ((Object)this).hashCode();
    }

    // Override deserializer to keep singleton
    @SuppressWarnings("static-method")
    private Object readResolve() throws ObjectStreamException {
      return INSTANCE;
    }

  }

}