my49bitbip.java

基于人工免疫原理的入侵检测系统框架

/*=================
 * Copyright (C) 2001  Todd Kaplan
 *
 * Lisys is a program that monitors TCP SYN packets to detect network
 * traffic anomalies.
 *
 * Licensed under the GNU General Public License (GPL), version 2 or
 * higher.  Please see the COPYING and PATENT files included with the
 * Lisys distribution, which can be found at:
 *
 *   http://www.cs.unm.edu/~judd/lisys/
 *
 * Also, the current text of the GPL can be found at: 
 *
 *   http://www.gnu.org/copyleft/gpl.html
 * 
 * Note that Lisys has NO WARRANTY!
 *=================*/

package edu.unm.cs.lisys.detection.bip;

import edu.unm.cs.lisys.debug.*;
import edu.unm.cs.lisys.util.*;
import java.io.*;
import java.util.*;
import java.net.*;

/**==========
 * My49BitBIP.java
 *   The basic BIP implementation consists of boiling
 * 
 * Here are the people who have worked on this code in the order they
 * have worked on it:
 *   @author Todd Kaplan <[e-mail]>
 *   @author Justin Balthrop <[e-mail]>
 *==========*/

public class My49BitBIP extends BinaryInputPattern implements Serializable
{
    private static final int NUMBER_OF_BITS = 49;
   
    private byte[] localIPMask;
    private boolean serverFlag;
    private String tcpDumpString;

    // Properties read from the constructorString.
    private String constructorString = new String();
    private String timestamp;
    
    public My49BitBIP() { }
    
    public My49BitBIP(BitSet bits) { super(bits); }
    
    /**==========
     * constructBinaryString:
     *   Creates a random binary string.
     *==========*/
    public BinaryInputPattern constructBinaryString(KnuthRandom random)
    {
	BitSet bits = new BitSet(NUMBER_OF_BITS);
	
	for (int i = 0; i < NUMBER_OF_BITS; i++) {
	    int value = random.intRange(2);
	    if (value == 1)
                bits.set(i);
	}
	
	binaryString =  bits;
	return this;
    }
    
    
    /**==========
     * constructBinaryString:
     *   Constructs binary string from a string of 0's and 1's.
     *==========*/
    public BinaryInputPattern constructBinaryString(String s)
    {
	constructorString = s;
	packBinaryString(s);
	
	return this;
    }
    

    public int getLength() { return NUMBER_OF_BITS; }

    private void packBinaryString(String s)
    {
	binaryString.xor(binaryString);
	for (int i=0; i<s.length(); i++) {
	    if (s.charAt(i)=='1') {
		binaryString.set(i);
	    }
	}
    }
    
    public String toString()
    {
	StringBuffer sb = new StringBuffer();
	if (tcpDumpString != null) 
	    sb.append(tcpDumpString + " ");
	
        sb.append("[");
	for (int i = 0; i < NUMBER_OF_BITS; i++) {
	    if (binaryString.get(i))
		sb.append("1");
	    else
		sb.append("0");
	    
	    if (((i+ 1) % 8) == 0)
	        sb.append(".");
	}
	
	sb.append("]");
	return sb.toString();
    }
    
    public String getConstructorString() { return constructorString; }
}