/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE369_Divide_by_Zero__int_listen_socket_modulo_01.c
Label Definition File: CWE369_Divide_by_Zero__int.label.xml
Template File: sources-sinks-01.tmpl.c
*/
/*
 * @description
 * CWE: 369 Divide by Zero
 * BadSource: listen_socket Read data using a listen socket (server side)
 * GoodSource: Non-zero
 * Sinks: modulo
 *    GoodSink: Check for zero before modulo
 *    BadSink : Modulo a constant with data
 * Flow Variant: 01 Baseline
 *
 * */

#include "std_testcase.h"

#ifdef _WIN32
#include <winsock2.h>
#include <windows.h>
#include <direct.h>
#pragma comment(lib, "ws2_32") /* include ws2_32.lib when linking */
#define CLOSE_SOCKET closesocket
#else
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#define INVALID_SOCKET -1
#define SOCKET_ERROR -1
#define CLOSE_SOCKET close
#define SOCKET int
#endif

#define TCP_PORT 27015
#define LISTEN_BACKLOG 5
#define CHAR_ARRAY_SIZE (3 * sizeof(data) + 2)

#ifndef OMITBAD

void CWE369_Divide_by_Zero__int_listen_socket_modulo_01_bad()
{
    int data;
    /* Initialize data */
    data = -1;
    {
#ifdef _WIN32
        WSADATA wsaData;
        int wsaDataInit = 0;
#endif
        int recvResult;
        struct sockaddr_in service;
        SOCKET listenSocket = INVALID_SOCKET;
        SOCKET acceptSocket = INVALID_SOCKET;
        char inputBuffer[CHAR_ARRAY_SIZE];
        do
        {
#ifdef _WIN32
            if (WSAStartup(MAKEWORD(2,2), &wsaData) != NO_ERROR)
            {
                break;
            }
            wsaDataInit = 1;
#endif
            /* POTENTIAL FLAW: Read data using a listen socket */
            listenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
            if (listenSocket == INVALID_SOCKET)
            {
                break;
            }
            memset(&service, 0, sizeof(service));
            service.sin_family = AF_INET;
            service.sin_addr.s_addr = INADDR_ANY;
            service.sin_port = htons(TCP_PORT);
            if (bind(listenSocket, (struct sockaddr*)&service, sizeof(service)) == SOCKET_ERROR)
            {
                break;
            }
            if (listen(listenSocket, LISTEN_BACKLOG) == SOCKET_ERROR)
            {
                break;
            }
            acceptSocket = accept(listenSocket, NULL, NULL);
            if (acceptSocket == SOCKET_ERROR)
            {
                break;
            }
            /* Abort on error or the connection was closed */
            recvResult = recv(acceptSocket, inputBuffer, CHAR_ARRAY_SIZE - 1, 0);
            if (recvResult == SOCKET_ERROR || recvResult == 0)
            {
                break;
            }
            /* NUL-terminate the string */
            inputBuffer[recvResult] = '\0';
            /* Convert to int */
            data = atoi(inputBuffer);
        }
        while (0);
        if (listenSocket != INVALID_SOCKET)
        {
            CLOSE_SOCKET(listenSocket);
        }
        if (acceptSocket != INVALID_SOCKET)
        {
            CLOSE_SOCKET(acceptSocket);
        }
#ifdef _WIN32
        if (wsaDataInit)
        {
            WSACleanup();
        }
#endif
    }
    /* POTENTIAL FLAW: Possibly divide by zero */
    printIntLine(100 % data);
}

#endif /* OMITBAD */

#ifndef OMITGOOD

/* goodG2B uses the GoodSource with the BadSink */
static void goodG2B()
{
    int data;
    /* Initialize data */
    data = -1;
    /* FIX: Use a value not equal to zero */
    data = 7;
    /* POTENTIAL FLAW: Possibly divide by zero */
    printIntLine(100 % data);
}

/* goodB2G uses the BadSource with the GoodSink */
static void goodB2G()
{
    int data;
    /* Initialize data */
    data = -1;
    {
#ifdef _WIN32
        WSADATA wsaData;
        int wsaDataInit = 0;
#endif
        int recvResult;
        struct sockaddr_in service;
        SOCKET listenSocket = INVALID_SOCKET;
        SOCKET acceptSocket = INVALID_SOCKET;
        char inputBuffer[CHAR_ARRAY_SIZE];
        do
        {
#ifdef _WIN32
            if (WSAStartup(MAKEWORD(2,2), &wsaData) != NO_ERROR)
            {
                break;
            }
            wsaDataInit = 1;
#endif
            /* POTENTIAL FLAW: Read data using a listen socket */
            listenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
            if (listenSocket == INVALID_SOCKET)
            {
                break;
            }
            memset(&service, 0, sizeof(service));
            service.sin_family = AF_INET;
            service.sin_addr.s_addr = INADDR_ANY;
            service.sin_port = htons(TCP_PORT);
            if (bind(listenSocket, (struct sockaddr*)&service, sizeof(service)) == SOCKET_ERROR)
            {
                break;
            }
            if (listen(listenSocket, LISTEN_BACKLOG) == SOCKET_ERROR)
            {
                break;
            }
            acceptSocket = accept(listenSocket, NULL, NULL);
            if (acceptSocket == SOCKET_ERROR)
            {
                break;
            }
            /* Abort on error or the connection was closed */
            recvResult = recv(acceptSocket, inputBuffer, CHAR_ARRAY_SIZE - 1, 0);
            if (recvResult == SOCKET_ERROR || recvResult == 0)
            {
                break;
            }
            /* NUL-terminate the string */
            inputBuffer[recvResult] = '\0';
            /* Convert to int */
            data = atoi(inputBuffer);
        }
        while (0);
        if (listenSocket != INVALID_SOCKET)
        {
            CLOSE_SOCKET(listenSocket);
        }
        if (acceptSocket != INVALID_SOCKET)
        {
            CLOSE_SOCKET(acceptSocket);
        }
#ifdef _WIN32
        if (wsaDataInit)
        {
            WSACleanup();
        }
#endif
    }
    /* FIX: test for a zero denominator */
    if( data != 0 )
    {
        printIntLine(100 % data);
    }
    else
    {
        printLine("This would result in a divide by zero");
    }
}

void CWE369_Divide_by_Zero__int_listen_socket_modulo_01_good()
{
    goodG2B();
    goodB2G();
}

#endif /* OMITGOOD */

/* 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. */

#ifdef INCLUDEMAIN

int main(int argc, char * argv[])
{
    /* seed randomness */
    srand( (unsigned)time(NULL) );
#ifndef OMITGOOD
    printLine("Calling good()...");
    CWE369_Divide_by_Zero__int_listen_socket_modulo_01_good();
    printLine("Finished good()");
#endif /* OMITGOOD */
#ifndef OMITBAD
    printLine("Calling bad()...");
    CWE369_Divide_by_Zero__int_listen_socket_modulo_01_bad();
    printLine("Finished bad()");
#endif /* OMITBAD */
    return 0;
}

#endif
