epsilonattackcommand.java

与postgresql数据库结合的数据库水印软件包

/*
 * 
 * Copyright 2003,2004 The Watermill Team
 *
 * This file is part of Watermill.
 *
 *    Watermill is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    Watermill is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with Watermill; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */
package Watermill.rmill;

import java.util.*;
import java.sql.*;
import Watermill.relational.*;
import Watermill.kernel.*;


public class EpsilonAttackCommand extends Command {
    public String dbname;
    public int amplitude;
    public int percent;

    public EpsilonAttackCommand(String dbname,int percent,int amplitude){
	this.dbname=dbname;
	this.amplitude=amplitude;
	this.percent=percent;
    }
    public String toString(){
	return "EpsilonAttackCommand on "+dbname+" amplitude "+amplitude;
    }
    public void execute(Manager m){
	DB document=(DB)m.getDocument(dbname,Constant.masterDBuser,Constant.masterDBpassword);
	
	Random r=new Random();
	Statement s=null;
	String query=null;
	try {
	    Connection con=document.getConnection();
	    s=con.createStatement();
	    
	    
	    for(int i=1;i<=100;i++){
		int j=r.nextInt(amplitude);
		if (r.nextInt(100)<percent){
		    if (r.nextBoolean()) j=-j;
		    
		    query="update product set cost=cost+"+j+" where idp='product"+i+"'";
		    s.executeUpdate(query);
		    Msg.debug("Altering tuple product"+i+" with "+j); 
		}
	    }
		
	    }
	    catch (Exception e){
		Msg.fatal(e);
	    }
	    Msg.println("EPSILON ATTACK");
	}
	
    }


//  FORALL $ID in {select distinct idc from sales}
//      global 0 on query { select idp,cost from product where "idp in (select idp from sales where idc=$ID)"