/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE190_Integer_Overflow__int_getParameter_Servlet_postinc_03.java
Label Definition File: CWE190_Integer_Overflow__int.label.xml
Template File: sources-sinks-03.tmpl.java
*/
/*
* @description
* CWE: 190 Integer Overflow
* BadSource: getParameter_Servlet Read data from a querystring using getParameter()
* GoodSource: A hardcoded non-zero, non-min, non-max, even number
* Sinks: increment
*    GoodSink: Ensure there will not be an overflow before incrementing data
*    BadSink : Increment data, which can cause an overflow
* Flow Variant: 03 Control flow: if(5==5) and if(5!=5)
*
* */

package testcases.CWE190_Integer_Overflow.s06;
import testcasesupport.*;

import javax.servlet.http.*;


import java.util.logging.Level;

public class CWE190_Integer_Overflow__int_getParameter_Servlet_postinc_03 extends AbstractTestCaseServlet
{
    public void bad(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        int data;
        if (5==5)
        {
            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);
                }
            }
        }
        else
        {
            /* 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;
        }

        if (5==5)
        {
            /* POTENTIAL FLAW: if data == Integer.MAX_VALUE, this will overflow */
            data++;
            int result = (int)(data);
            IO.writeLine("result: " + result);
        }
    }

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

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

        }

        if (5==5)
        {
            /* POTENTIAL FLAW: if data == Integer.MAX_VALUE, this will overflow */
            data++;
            int result = (int)(data);
            IO.writeLine("result: " + result);
        }
    }

    /* goodG2B2() - use goodsource and badsink by reversing statements in first if */
    private void goodG2B2(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        int data;
        if (5==5)
        {
            /* FIX: Use a hardcoded number that won't cause underflow, overflow, divide by zero, or loss-of-precision issues */
            data = 2;
        }
        else
        {
            /* 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;
        }

        if (5==5)
        {
            /* POTENTIAL FLAW: if data == Integer.MAX_VALUE, this will overflow */
            data++;
            int result = (int)(data);
            IO.writeLine("result: " + result);
        }
    }

    /* goodB2G1() - use badsource and goodsink by changing second 5==5 to 5!=5 */
    private void goodB2G1(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        int data;
        if (5==5)
        {
            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);
                }
            }
        }
        else
        {
            /* 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;
        }

        if (5!=5)
        {
            /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
            IO.writeLine("Benign, fixed string");
        }
        else
        {

            /* FIX: Add a check to prevent an overflow from occurring */
            if (data < Integer.MAX_VALUE)
            {
                data++;
                int result = (int)(data);
                IO.writeLine("result: " + result);
            }
            else
            {
                IO.writeLine("data value is too large to increment.");
            }

        }
    }

    /* goodB2G2() - use badsource and goodsink by reversing statements in second if  */
    private void goodB2G2(HttpServletRequest request, HttpServletResponse response) throws Throwable
    {
        int data;
        if (5==5)
        {
            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);
                }
            }
        }
        else
        {
            /* 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;
        }

        if (5==5)
        {
            /* FIX: Add a check to prevent an overflow from occurring */
            if (data < Integer.MAX_VALUE)
            {
                data++;
                int result = (int)(data);
                IO.writeLine("result: " + result);
            }
            else
            {
                IO.writeLine("data value is too large to increment.");
            }
        }
    }

    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);
    }
}
