/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE190_Integer_Overflow__int_getQueryString_Servlet_square_16.java
Label Definition File: CWE190_Integer_Overflow__int.label.xml
Template File: sources-sinks-16.tmpl.java
*/
/*
* @description
* CWE: 190 Integer Overflow
* BadSource: getQueryString_Servlet Parse id param out of the URL query string (without using getParameter())
* GoodSource: A hardcoded non-zero, non-min, non-max, even number
* Sinks: square
*    GoodSink: Ensure there will not be an overflow before squaring data
*    BadSink : Square data, which can lead to overflow
* Flow Variant: 16 Control flow: while(true)
*
* */




import javax.servlet.http.*;


import java.util.StringTokenizer;
import java.util.logging.Level;

public class CWE190_Integer_Overflow__int_getQueryString_Servlet_square_16 extends AbstractTestCaseServlet
{
    public void bad(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        int data;

        while (true)
        {
            data = Integer.MIN_VALUE; /* initialize data in case id is not in query string */
            /* POTENTIAL FLAW: Parse id param out of the URL querystring (without using getParam) */
            {
                StringTokenizer tokenizer = new StringTokenizer(request.getQueryString(), "&");
                while (tokenizer.hasMoreTokens())
                {
                    String token = tokenizer.nextToken(); /* a token will be like "id=33" */
                    if(token.startsWith("id=")) /* check if we have the "id" parameter" */
                    {
                        try
                        {
                            data = Integer.parseInt(token.substring(3)); /* set data to the int 33 */
                        }
                        catch(NumberFormatException exceptNumberFormat)
                        {
                            IO.logger.log(Level.WARNING, "Number format exception reading id from query string", exceptNumberFormat);
                        }
                        break; /* exit while loop */
                    }
                }
            }
            break;
        }

        while (true)
        {
            /* POTENTIAL FLAW: if (data*data) > Integer.MAX_VALUE, this will overflow */
            int result = (int)(data * data);
            IO.writeLine("result: " + result);
            break;
        }
    }

    /* goodG2B() - use goodsource and badsink */
    private void goodG2B(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        int data;

        while (true)
        {
            /* FIX: Use a hardcoded number that won't cause underflow, overflow, divide by zero, or loss-of-precision issues */
            data = 2;
            break;
        }

        while (true)
        {
            /* POTENTIAL FLAW: if (data*data) > Integer.MAX_VALUE, this will overflow */
            int result = (int)(data * data);
            IO.writeLine("result: " + result);
            break;
        }

    }

    /* goodB2G() - use badsource and goodsink */
    private void goodB2G(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        int data;

        while (true)
        {
            data = Integer.MIN_VALUE; /* initialize data in case id is not in query string */
            /* POTENTIAL FLAW: Parse id param out of the URL querystring (without using getParam) */
            {
                StringTokenizer tokenizer = new StringTokenizer(request.getQueryString(), "&");
                while (tokenizer.hasMoreTokens())
                {
                    String token = tokenizer.nextToken(); /* a token will be like "id=33" */
                    if(token.startsWith("id=")) /* check if we have the "id" parameter" */
                    {
                        try
                        {
                            data = Integer.parseInt(token.substring(3)); /* set data to the int 33 */
                        }
                        catch(NumberFormatException exceptNumberFormat)
                        {
                            IO.logger.log(Level.WARNING, "Number format exception reading id from query string", exceptNumberFormat);
                        }
                        break; /* exit while loop */
                    }
                }
            }
            break;
        }

        while (true)
        {
            /* FIX: Add a check to prevent an overflow from occurring */
            /* NOTE: Math.abs of the minimum int or long will return that same value, so we must check for it */
            if ((data != Integer.MIN_VALUE) && (data != Long.MIN_VALUE) && (Math.abs(data) <= (long)Math.sqrt(Integer.MAX_VALUE)))
            {
                int result = (int)(data * data);
                IO.writeLine("result: " + result);
            }
            else
            {
                IO.writeLine("data value is too large to perform squaring.");
            }
            break;
        }
    }

    public void good(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        goodG2B(request, response);
        goodB2G(request, response);
    }

    /* Below is the main(). It is only used when building this testcase on
     * its own for testing or for building a binary to use in testing binary
     * analysis tools. It is not used when compiling all the testcases as one
     * application, which is how source code analysis tools are tested.
     */
    public static void main(String[] args) throws ClassNotFoundException,
           InstantiationException, IllegalAccessException
    {
        mainFromParent(args);
    }
}
