/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE129_Improper_Validation_of_Array_Index__getParameter_Servlet_array_write_no_check_31.java
Label Definition File: CWE129_Improper_Validation_of_Array_Index.label.xml
Template File: sources-sinks-31.tmpl.java
*/
/*
 * @description
 * CWE: 129 Improper Validation of Array Index
 * BadSource: getParameter_Servlet Read data from a querystring using getParameter()
 * GoodSource: A hardcoded non-zero, non-min, non-max, even number
 * Sinks: array_write_no_check
 *    GoodSink: Write to array after verifying index
 *    BadSink : Write to array without any verification of index
 * Flow Variant: 31 Data flow: make a copy of data within the same method
 *
 * */




import javax.servlet.http.*;


import java.util.logging.Level;

public class CWE129_Improper_Validation_of_Array_Index__getParameter_Servlet_array_write_no_check_31 extends AbstractTestCaseServlet
{
    public void bad(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        int dataCopy;
        {
            int data;

            data = Integer.MIN_VALUE; /* Initialize data */

            /* POTENTIAL FLAW: Read data from a querystring using getParameter() */
            {
                String stringNumber = request.getParameter("name");

                try
                {
                    data = Integer.parseInt(stringNumber.trim());
                }
                catch(NumberFormatException exceptNumberFormat)
                {
                    IO.logger.log(Level.WARNING, "Number format exception reading data from parameter 'name'", exceptNumberFormat);
                }
            }

            dataCopy = data;
        }
        {
            int data = dataCopy;

            /* Need to ensure that the array is of size > 3  and < 101 due to the GoodSource and the large_fixed BadSource */
            int array[] = { 0, 1, 2, 3, 4 };

            /* POTENTIAL FLAW: Attempt to write to array at location data, which may be outside the array bounds */
            array[data] = 42;

            /* Skip reading back data from array since that may be another out of bounds operation */

        }
    }

    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 dataCopy;
        {
            int data;

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

            dataCopy = data;
        }
        {
            int data = dataCopy;

            /* Need to ensure that the array is of size > 3  and < 101 due to the GoodSource and the large_fixed BadSource */
            int array[] = { 0, 1, 2, 3, 4 };

            /* POTENTIAL FLAW: Attempt to write to array at location data, which may be outside the array bounds */
            array[data] = 42;

            /* Skip reading back data from array since that may be another out of bounds operation */

        }
    }

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

            data = Integer.MIN_VALUE; /* Initialize data */

            /* POTENTIAL FLAW: Read data from a querystring using getParameter() */
            {
                String stringNumber = request.getParameter("name");

                try
                {
                    data = Integer.parseInt(stringNumber.trim());
                }
                catch(NumberFormatException exceptNumberFormat)
                {
                    IO.logger.log(Level.WARNING, "Number format exception reading data from parameter 'name'", exceptNumberFormat);
                }
            }

            dataCopy = data;
        }
        {
            int data = dataCopy;

            /* Need to ensure that the array is of size > 3  and < 101 due to the GoodSource and the large_fixed BadSource */
            int array[] = { 0, 1, 2, 3, 4 };

            /* FIX: Verify index before writing to array at location data */
            if (data >= 0 && data < array.length)
            {
                array[data] = 42;
            }
            else
            {
                IO.writeLine("Array index out of bounds");
            }

        }
    }

    /* 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);
    }
}
