/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE369_Divide_by_Zero__int_getCookies_Servlet_modulo_01.java
Label Definition File: CWE369_Divide_by_Zero__int.label.xml
Template File: sources-sinks-01.tmpl.java
*/
/*
* @description
* CWE: 369 Divide by zero
* BadSource: getCookies_Servlet Read data from the first cookie using getCookies()
* GoodSource: A hardcoded non-zero, non-min, non-max, even number
* Sinks: modulo
*    GoodSink: Check for zero before modulo
*    BadSink : Modulo by a value that may be zero
* Flow Variant: 01 Baseline
*
* */




import javax.servlet.http.*;


import java.util.logging.Level;

public class CWE369_Divide_by_Zero__int_getCookies_Servlet_modulo_01 extends AbstractTestCaseServlet
{
    public void bad(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        int data;

        data = Integer.MIN_VALUE; /* initialize data in case there are no cookies */

        /* Read data from cookies */
        {
            Cookie cookieSources[] = request.getCookies();
            if (cookieSources != null)
            {
                /* POTENTIAL FLAW: Read data from the first cookie value */
                String stringNumber = cookieSources[0].getValue();
                try
                {
                    data = Integer.parseInt(stringNumber.trim());
                }
                catch(NumberFormatException exceptNumberFormat)
                {
                    IO.logger.log(Level.WARNING, "Number format exception reading data from cookie", exceptNumberFormat);
                }
            }
        }

        /* POTENTIAL FLAW: Zero modulus will cause an issue.  An integer division will
        result in an exception.  */
        IO.writeLine("100%" + data + " = " + (100 % data) + "\n");

    }

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

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

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

        /* POTENTIAL FLAW: Zero modulus will cause an issue.  An integer division will
        result in an exception.  */
        IO.writeLine("100%" + data + " = " + (100 % data) + "\n");

    }

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

        data = Integer.MIN_VALUE; /* initialize data in case there are no cookies */

        /* Read data from cookies */
        {
            Cookie cookieSources[] = request.getCookies();
            if (cookieSources != null)
            {
                /* POTENTIAL FLAW: Read data from the first cookie value */
                String stringNumber = cookieSources[0].getValue();
                try
                {
                    data = Integer.parseInt(stringNumber.trim());
                }
                catch(NumberFormatException exceptNumberFormat)
                {
                    IO.logger.log(Level.WARNING, "Number format exception reading data from cookie", exceptNumberFormat);
                }
            }
        }

        /* FIX: test for a zero modulus */
        if (data != 0)
        {
            IO.writeLine("100%" + data + " = " + (100 % data) + "\n");
        }
        else
        {
            IO.writeLine("This would result in a modulo by zero");
        }

    }

    /* 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);
    }
}

