All Downloads are FREE. Search and download functionalities are using the official Maven repository.

org.pcap4j.packet.Ssh2KexDhReplyPacket Maven / Gradle / Ivy

There is a newer version: 2.0.0-alpha.6
Show newest version
/*_##########################################################################
  _##
  _##  Copyright (C) 2014  Pcap4J.org
  _##
  _##########################################################################
*/

package org.pcap4j.packet;

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 Ssh2KexDhReplyPacket extends AbstractPacket {

  /** */
  private static final long serialVersionUID = 6507040765944406940L;

  private final Ssh2KexDhReplyHeader 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 Ssh2KexDhReplyPacket object.
   * @throws IllegalRawDataException if parsing the raw data fails.
   */
  public static Ssh2KexDhReplyPacket newPacket(byte[] rawData, int offset, int length)
      throws IllegalRawDataException {
    ByteArrays.validateBounds(rawData, offset, length);
    return new Ssh2KexDhReplyPacket(rawData, offset, length);
  }

  private Ssh2KexDhReplyPacket(byte[] rawData, int offset, int length)
      throws IllegalRawDataException {
    this.header = new Ssh2KexDhReplyHeader(rawData, offset, length);
  }

  private Ssh2KexDhReplyPacket(Builder builder) {
    if (builder == null
        || builder.k_s == null
        || builder.f == null
        || builder.signatureOfH == null) {
      StringBuilder sb = new StringBuilder();
      sb.append("builder: ")
          .append(builder)
          .append(" builder.k_s: ")
          .append(builder.k_s)
          .append(" builder.f: ")
          .append(builder.f)
          .append(" builder.signatureOfH: ")
          .append(builder.signatureOfH);
      throw new NullPointerException(sb.toString());
    }

    this.header = new Ssh2KexDhReplyHeader(builder);
  }

  @Override
  public Ssh2KexDhReplyHeader getHeader() {
    return header;
  }

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

  /**
   * @author Kaito Yamada
   * @since pcap4j 1.0.1
   */
  public static final class Builder extends AbstractBuilder {

    private Ssh2String k_s;
    private Ssh2MpInt f;
    private Ssh2String signatureOfH;

    /** */
    public Builder() {}

    private Builder(Ssh2KexDhReplyPacket packet) {
      this.k_s = packet.header.k_s;
      this.f = packet.header.f;
      this.signatureOfH = packet.header.signatureOfH;
    }

    /**
     * @param k_s k_s
     * @return this Builder object for method chaining.
     */
    public Builder k_s(Ssh2String k_s) {
      this.k_s = k_s;
      return this;
    }

    /**
     * @param f f
     * @return this Builder object for method chaining.
     */
    public Builder f(Ssh2MpInt f) {
      this.f = f;
      return this;
    }

    /**
     * @param signatureOfH signatureOfH
     * @return this Builder object for method chaining.
     */
    public Builder signatureOfH(Ssh2String signatureOfH) {
      this.signatureOfH = signatureOfH;
      return this;
    }

    @Override
    public Ssh2KexDhReplyPacket build() {
      return new Ssh2KexDhReplyPacket(this);
    }
  }

  /**
   * @author Kaito Yamada
   * @version pcap4j 1.0.1
   */
  public static final class Ssh2KexDhReplyHeader extends AbstractHeader {

    /*
     * http://tools.ietf.org/html/rfc4253
     *
     * byte      SSH_MSG_KEXDH_REPLY
     * string    server public host key and certificates (K_S)
     * mpint     f
     * string    signature of H
     */

    /** */
    private static final long serialVersionUID = 4008432145902117221L;

    private final Ssh2MessageNumber messageNumber = Ssh2MessageNumber.SSH_MSG_KEXDH_REPLY;
    private final Ssh2String k_s;
    private final Ssh2MpInt f;
    private final Ssh2String signatureOfH;

    private Ssh2KexDhReplyHeader(byte[] rawData, int offset, int length)
        throws IllegalRawDataException {
      if (length < 13) {
        StringBuilder sb = new StringBuilder(80);
        sb.append("The data is too short to build an SSH2 KEX DH reply 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_KEXDH_REPLY)) {
        StringBuilder sb = new StringBuilder(120);
        sb.append("The data is not an SSH2 KEX DH reply message. data: ")
            .append(new String(rawData))
            .append(", offset: ")
            .append(offset)
            .append(", length: ")
            .append(length);
        throw new IllegalRawDataException(sb.toString());
      }

      int currentOffset = 1 + offset;
      int remainingLength = length - 1;
      this.k_s = new Ssh2String(rawData, currentOffset, remainingLength);
      currentOffset += k_s.length();
      remainingLength -= k_s.length();
      this.f = new Ssh2MpInt(rawData, currentOffset, remainingLength);
      currentOffset += f.length();
      remainingLength -= f.length();
      this.signatureOfH = new Ssh2String(rawData, currentOffset, remainingLength);
    }

    private Ssh2KexDhReplyHeader(Builder builder) {
      this.k_s = builder.k_s;
      this.f = builder.f;
      this.signatureOfH = builder.signatureOfH;
    }

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

    /** @return K_S */
    public Ssh2String getK_s() {
      return k_s;
    }

    /** @return f */
    public Ssh2MpInt getF() {
      return f;
    }

    /** @return signature of H */
    public Ssh2String getSignatureOfH() {
      return signatureOfH;
    }

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

    @Override
    protected int calcLength() {
      return getRawData().length;
    }

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

      sb.append("[SSH2 KEX DH reply Header (").append(length()).append(" bytes)]").append(ls);
      sb.append("  Message Number: ").append(messageNumber).append(ls);
      sb.append("  K_S: ").append(k_s).append(ls);
      sb.append("  f: ").append(f).append(ls);
      sb.append("  signature of H: ").append(signatureOfH).append(ls);

      return sb.toString();
    }

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

      Ssh2KexDhReplyHeader other = (Ssh2KexDhReplyHeader) obj;
      return k_s.equals(other.k_s) && f.equals(other.f) && signatureOfH.equals(other.signatureOfH);
    }

    @Override
    protected int calcHashCode() {
      int result = 17;
      result = 31 * result + k_s.hashCode();
      result = 31 * result + f.hashCode();
      result = 31 * result + signatureOfH.hashCode();
      return result;
    }
  }
}




© 2015 - 2024 Weber Informatics LLC | Privacy Policy