/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE129_Improper_Validation_of_Array_Index__getQueryString_Servlet_array_write_no_check_15.java
Label Definition File: CWE129_Improper_Validation_of_Array_Index.label.xml
Template File: sources-sinks-15.tmpl.java
*/
/*
* @description
* CWE: 129 Improper Validation of Array Index
* 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: array_write_no_check
*    GoodSink: Write to array after verifying index
*    BadSink : Write to array without any verification of index
* Flow Variant: 15 Control flow: switch(6) and switch(7)
*
* */




import javax.servlet.http.*;


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

public class CWE129_Improper_Validation_of_Array_Index__getQueryString_Servlet_array_write_no_check_15 extends AbstractTestCaseServlet
{
    public void bad(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        int data;

        switch (6)
        {
        case 6:
            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;
        default:
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run
             * but ensure data is inititialized before the Sink to avoid compiler errors */
            data = 0;
            break;
        }

        switch (7)
        {
        case 7:
            /* 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 */
            break;
        default:
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
            IO.writeLine("Benign, fixed string");
            break;
        }
    }

    /* goodG2B1() - use goodsource and badsink by changing the first switch to switch(5) */
    private void goodG2B1(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        int data;

        switch (5)
        {
        case 6:
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run
             * but ensure data is inititialized before the Sink to avoid compiler errors */
            data = 0;
            break;
        default:
            /* FIX: Use a hardcoded number that won't cause underflow, overflow, divide by zero, or loss-of-precision issues */
            data = 2;
            break;
        }

        switch (7)
        {
        case 7:
            /* 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 */
            break;
        default:
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
            IO.writeLine("Benign, fixed string");
            break;
        }
    }

    /* goodG2B2() - use goodsource and badsink by reversing the blocks in the first switch  */
    private void goodG2B2(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        int data;

        switch (6)
        {
        case 6:
            /* FIX: Use a hardcoded number that won't cause underflow, overflow, divide by zero, or loss-of-precision issues */
            data = 2;
            break;
        default:
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run
             * but ensure data is inititialized before the Sink to avoid compiler errors */
            data = 0;
            break;
        }

        switch (7)
        {
        case 7:
            /* 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 */
            break;
        default:
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
            IO.writeLine("Benign, fixed string");
            break;
        }
    }

    /* goodB2G1() - use badsource and goodsink by changing the second switch to switch(8) */
    private void goodB2G1(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        int data;

        switch (6)
        {
        case 6:
            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;
        default:
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run
             * but ensure data is inititialized before the Sink to avoid compiler errors */
            data = 0;
            break;
        }

        switch (8)
        {
        case 7:
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
            IO.writeLine("Benign, fixed string");
            break;
        default:
            /* 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");
            }
            break;
        }
    }

    /* goodB2G2() - use badsource and goodsink by reversing the blocks in the second switch  */
    private void goodB2G2(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        int data;

        switch (6)
        {
        case 6:
            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;
        default:
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run
             * but ensure data is inititialized before the Sink to avoid compiler errors */
            data = 0;
            break;
        }

        switch (7)
        {
        case 7:
            /* 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");
            }
            break;
        default:
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
            IO.writeLine("Benign, fixed string");
            break;
        }
    }

    public void good(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        goodG2B1(request, response);
        goodG2B2(request, response);
        goodB2G1(request, response);
        goodB2G2(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);
    }
}
