/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE190_Integer_Overflow__int_listen_tcp_preinc_21.java
Label Definition File: CWE190_Integer_Overflow__int.label.xml
Template File: sources-sinks-21.tmpl.java
*/
/*
 * @description
 * CWE: 190 Integer Overflow
 * BadSource: listen_tcp Read data using a listening tcp connection
 * 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: 21 Control flow: Flow controlled by value of a private variable. All functions contained in one file.
 *
 * */

package testcases.CWE190_Integer_Overflow.s07;
import testcasesupport.*;

import javax.servlet.http.*;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.net.Socket;
import java.net.ServerSocket;

import java.util.logging.Level;

public class CWE190_Integer_Overflow__int_listen_tcp_preinc_21 extends AbstractTestCase
{
    /* The variable below is used to drive control flow in the sink function */
    private boolean badPrivate = false;

    public void bad() throws Throwable
    {
        int data;

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

        {
            ServerSocket listener = null;
            Socket socket = null;
            BufferedReader readerBuffered = null;
            InputStreamReader readerInputStream = null;

            /* Read data using a listening tcp connection */
            try
            {
                listener = new ServerSocket(39543);
                socket = listener.accept();

                /* read input from socket */

                readerInputStream = new InputStreamReader(socket.getInputStream(), "UTF-8");
                readerBuffered = new BufferedReader(readerInputStream);

                /* POTENTIAL FLAW: Read data using a listening tcp connection */
                String stringNumber = readerBuffered.readLine();
                if (stringNumber != null) // avoid NPD incidental warnings
                {
                    try
                    {
                        data = Integer.parseInt(stringNumber.trim());
                    }
                    catch(NumberFormatException exceptNumberFormat)
                    {
                        IO.logger.log(Level.WARNING, "Number format exception parsing data from string", exceptNumberFormat);
                    }
                }
            }
            catch (IOException exceptIO)
            {
                IO.logger.log(Level.WARNING, "Error with stream reading", exceptIO);
            }
            finally
            {
                /* Close stream reading objects */
                try
                {
                    if (readerBuffered != null)
                    {
                        readerBuffered.close();
                    }
                }
                catch (IOException exceptIO)
                {
                    IO.logger.log(Level.WARNING, "Error closing BufferedReader", exceptIO);
                }

                try
                {
                    if (readerInputStream != null)
                    {
                        readerInputStream.close();
                    }
                }
                catch (IOException exceptIO)
                {
                    IO.logger.log(Level.WARNING, "Error closing InputStreamReader", exceptIO);
                }

                /* Close socket objects */
                try
                {
                    if (socket != null)
                    {
                        socket.close();
                    }
                }
                catch (IOException exceptIO)
                {
                    IO.logger.log(Level.WARNING, "Error closing Socket", exceptIO);
                }

                try
                {
                    if (listener != null)
                    {
                        listener.close();
                    }
                }
                catch (IOException exceptIO)
                {
                    IO.logger.log(Level.WARNING, "Error closing ServerSocket", exceptIO);
                }
            }
        }

        badPrivate = true;
        badSink(data );
    }

    private void badSink(int data ) throws Throwable
    {
        if (badPrivate)
        {
            /* POTENTIAL FLAW: if data == Integer.MAX_VALUE, this will overflow */
            int result = (int)(++data);
            IO.writeLine("result: " + result);
        }
    }

    /* The variables below are used to drive control flow in the sink functions. */
    private boolean goodB2G1Private = false;
    private boolean goodB2G2Private = false;
    private boolean goodG2BPrivate = false;

    public void good() throws Throwable
    {
        goodB2G1();
        goodB2G2();
        goodG2B();
    }

    /* goodB2G1() - use BadSource and GoodSink by setting the variable to false instead of true */
    private void goodB2G1() throws Throwable
    {
        int data;

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

        {
            ServerSocket listener = null;
            Socket socket = null;
            BufferedReader readerBuffered = null;
            InputStreamReader readerInputStream = null;

            /* Read data using a listening tcp connection */
            try
            {
                listener = new ServerSocket(39543);
                socket = listener.accept();

                /* read input from socket */

                readerInputStream = new InputStreamReader(socket.getInputStream(), "UTF-8");
                readerBuffered = new BufferedReader(readerInputStream);

                /* POTENTIAL FLAW: Read data using a listening tcp connection */
                String stringNumber = readerBuffered.readLine();
                if (stringNumber != null) // avoid NPD incidental warnings
                {
                    try
                    {
                        data = Integer.parseInt(stringNumber.trim());
                    }
                    catch(NumberFormatException exceptNumberFormat)
                    {
                        IO.logger.log(Level.WARNING, "Number format exception parsing data from string", exceptNumberFormat);
                    }
                }
            }
            catch (IOException exceptIO)
            {
                IO.logger.log(Level.WARNING, "Error with stream reading", exceptIO);
            }
            finally
            {
                /* Close stream reading objects */
                try
                {
                    if (readerBuffered != null)
                    {
                        readerBuffered.close();
                    }
                }
                catch (IOException exceptIO)
                {
                    IO.logger.log(Level.WARNING, "Error closing BufferedReader", exceptIO);
                }

                try
                {
                    if (readerInputStream != null)
                    {
                        readerInputStream.close();
                    }
                }
                catch (IOException exceptIO)
                {
                    IO.logger.log(Level.WARNING, "Error closing InputStreamReader", exceptIO);
                }

                /* Close socket objects */
                try
                {
                    if (socket != null)
                    {
                        socket.close();
                    }
                }
                catch (IOException exceptIO)
                {
                    IO.logger.log(Level.WARNING, "Error closing Socket", exceptIO);
                }

                try
                {
                    if (listener != null)
                    {
                        listener.close();
                    }
                }
                catch (IOException exceptIO)
                {
                    IO.logger.log(Level.WARNING, "Error closing ServerSocket", exceptIO);
                }
            }
        }

        goodB2G1Private = false;
        goodB2G1Sink(data );
    }

    private void goodB2G1Sink(int data ) throws Throwable
    {
        if (goodB2G1Private)
        {
            /* 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)
            {
                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 the blocks in the if in the sink function */
    private void goodB2G2() throws Throwable
    {
        int data;

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

        {
            ServerSocket listener = null;
            Socket socket = null;
            BufferedReader readerBuffered = null;
            InputStreamReader readerInputStream = null;

            /* Read data using a listening tcp connection */
            try
            {
                listener = new ServerSocket(39543);
                socket = listener.accept();

                /* read input from socket */

                readerInputStream = new InputStreamReader(socket.getInputStream(), "UTF-8");
                readerBuffered = new BufferedReader(readerInputStream);

                /* POTENTIAL FLAW: Read data using a listening tcp connection */
                String stringNumber = readerBuffered.readLine();
                if (stringNumber != null) // avoid NPD incidental warnings
                {
                    try
                    {
                        data = Integer.parseInt(stringNumber.trim());
                    }
                    catch(NumberFormatException exceptNumberFormat)
                    {
                        IO.logger.log(Level.WARNING, "Number format exception parsing data from string", exceptNumberFormat);
                    }
                }
            }
            catch (IOException exceptIO)
            {
                IO.logger.log(Level.WARNING, "Error with stream reading", exceptIO);
            }
            finally
            {
                /* Close stream reading objects */
                try
                {
                    if (readerBuffered != null)
                    {
                        readerBuffered.close();
                    }
                }
                catch (IOException exceptIO)
                {
                    IO.logger.log(Level.WARNING, "Error closing BufferedReader", exceptIO);
                }

                try
                {
                    if (readerInputStream != null)
                    {
                        readerInputStream.close();
                    }
                }
                catch (IOException exceptIO)
                {
                    IO.logger.log(Level.WARNING, "Error closing InputStreamReader", exceptIO);
                }

                /* Close socket objects */
                try
                {
                    if (socket != null)
                    {
                        socket.close();
                    }
                }
                catch (IOException exceptIO)
                {
                    IO.logger.log(Level.WARNING, "Error closing Socket", exceptIO);
                }

                try
                {
                    if (listener != null)
                    {
                        listener.close();
                    }
                }
                catch (IOException exceptIO)
                {
                    IO.logger.log(Level.WARNING, "Error closing ServerSocket", exceptIO);
                }
            }
        }

        goodB2G2Private = true;
        goodB2G2Sink(data );
    }

    private void goodB2G2Sink(int data ) throws Throwable
    {
        if (goodB2G2Private)
        {
            /* FIX: Add a check to prevent an overflow from occurring */
            if (data < Integer.MAX_VALUE)
            {
                int result = (int)(++data);
                IO.writeLine("result: " + result);
            }
            else
            {
                IO.writeLine("data value is too large to increment.");
            }
        }
    }

    /* goodG2B() - use GoodSource and BadSink */
    private void goodG2B() 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;

        goodG2BPrivate = true;
        goodG2BSink(data );
    }

    private void goodG2BSink(int data ) throws Throwable
    {
        if (goodG2BPrivate)
        {
            /* POTENTIAL FLAW: if data == Integer.MAX_VALUE, this will overflow */
            int result = (int)(++data);
            IO.writeLine("result: " + result);
        }
    }

    /* 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);
    }
}
