/* TEMPLATE GENERATED TESTCASE FILE
Filename: CWE680_Integer_Overflow_to_Buffer_Overflow__malloc_connect_socket_45.c
Label Definition File: CWE680_Integer_Overflow_to_Buffer_Overflow__malloc.label.xml
Template File: sources-sink-45.tmpl.c
*/
/*
 * @description
 * CWE: 680 Integer Overflow to Buffer Overflow
 * BadSource: connect_socket Read data using a connect socket (client side)
 * GoodSource: Small number greater than zero that will not cause an integer overflow in the sink
 * Sinks:
 *    BadSink : Attempt to allocate array using length value from source
 * Flow Variant: 45 Data flow: data passed as a static global variable from one function to another in the same source file
 *
 * */

#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 /* NOT _WIN32 */
#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 IP_ADDRESS "127.0.0.1"
#define CHAR_ARRAY_SIZE (3 * sizeof(data) + 2)

static int CWE680_Integer_Overflow_to_Buffer_Overflow__malloc_connect_socket_45_badData;
static int CWE680_Integer_Overflow_to_Buffer_Overflow__malloc_connect_socket_45_goodG2BData;

#ifndef OMITBAD

static void badSink()
{
    int data = CWE680_Integer_Overflow_to_Buffer_Overflow__malloc_connect_socket_45_badData;
    {
        size_t i;
        int *intPointer;
        /* POTENTIAL FLAW: if data * sizeof(int) > SIZE_MAX, overflows to a small value
         * so that the for loop doing the initialization causes a buffer overflow */
        intPointer = (int*)malloc(data * sizeof(int));
        for (i = 0; i < (size_t)data; i++)
        {
            intPointer[i] = 0; /* Potentially writes beyond the boundary of intPointer */
        }
        printIntLine(intPointer[0]);
        free(intPointer);
    }
}

void CWE680_Integer_Overflow_to_Buffer_Overflow__malloc_connect_socket_45_bad()
{
    int data;
    /* Initialize data */
    data = -1;
    {
#ifdef _WIN32
        WSADATA wsaData;
        int wsaDataInit = 0;
#endif
        int recvResult;
        struct sockaddr_in service;
        SOCKET connectSocket = 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 connect socket */
            connectSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
            if (connectSocket == INVALID_SOCKET)
            {
                break;
            }
            memset(&service, 0, sizeof(service));
            service.sin_family = AF_INET;
            service.sin_addr.s_addr = inet_addr(IP_ADDRESS);
            service.sin_port = htons(TCP_PORT);
            if (connect(connectSocket, (struct sockaddr*)&service, sizeof(service)) == SOCKET_ERROR)
            {
                break;
            }
            /* Abort on error or the connection was closed, make sure to recv one
             * less char than is in the recv_buf in order to append a terminator */
            recvResult = recv(connectSocket, 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 (connectSocket != INVALID_SOCKET)
        {
            CLOSE_SOCKET(connectSocket);
        }
#ifdef _WIN32
        if (wsaDataInit)
        {
            WSACleanup();
        }
#endif
    }
    CWE680_Integer_Overflow_to_Buffer_Overflow__malloc_connect_socket_45_badData = data;
    badSink();
}

#endif /* OMITBAD */

#ifndef OMITGOOD

/* goodG2B() uses the GoodSource with the BadSink */
static void goodG2BSink()
{
    int data = CWE680_Integer_Overflow_to_Buffer_Overflow__malloc_connect_socket_45_goodG2BData;
    {
        size_t i;
        int *intPointer;
        /* POTENTIAL FLAW: if data * sizeof(int) > SIZE_MAX, overflows to a small value
         * so that the for loop doing the initialization causes a buffer overflow */
        intPointer = (int*)malloc(data * sizeof(int));
        for (i = 0; i < (size_t)data; i++)
        {
            intPointer[i] = 0; /* Potentially writes beyond the boundary of intPointer */
        }
        printIntLine(intPointer[0]);
        free(intPointer);
    }
}

static void goodG2B()
{
    int data;
    /* Initialize data */
    data = -1;
    /* FIX: Set data to a relatively small number greater than zero */
    data = 20;
    CWE680_Integer_Overflow_to_Buffer_Overflow__malloc_connect_socket_45_goodG2BData = data;
    goodG2BSink();
}

void CWE680_Integer_Overflow_to_Buffer_Overflow__malloc_connect_socket_45_good()
{
    goodG2B();
}

#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()...");
    CWE680_Integer_Overflow_to_Buffer_Overflow__malloc_connect_socket_45_good();
    printLine("Finished good()");
#endif /* OMITGOOD */
#ifndef OMITBAD
    printLine("Calling bad()...");
    CWE680_Integer_Overflow_to_Buffer_Overflow__malloc_connect_socket_45_bad();
    printLine("Finished bad()");
#endif /* OMITBAD */
    return 0;
}

#endif
