text: /* TEMPLATE GENERATED TESTCASE FILE
  Filename: CWE191_Integer_Underflow__int_listen_socket_predec_05.c
  Label Definition File: CWE191_Integer_Underflow__int.label.xml
  Template File: sources-sinks-05.tmpl.c
  */
  /*
   * @description
   * CWE: 191 Integer Underflow
   * BadSource: listen_socket Read data using a listen socket (server side)
   * GoodSource: Set data to a small, non-zero number (negative two)
   * Sinks: decrement
   *    GoodSink: Ensure there will not be an underflow before decrementing data
   *    BadSink : Decrement data, which can cause an Underflow
   * Flow Variant: 05 Control flow: if(staticTrue) and if(staticFalse)
   *
   * */
  
  #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)
  
  /* The two variables below are not defined as "const", but are never
     assigned any other value, so a tool should be able to identify that
     reads of these will always return their initialized values. */
  static int staticTrue = 1; /* true */
  static int staticFalse = 0; /* false */
  
  #ifndef OMITBAD
  
  void CWE191_Integer_Underflow__int_listen_socket_predec_05_bad()
  {
      int data;
      /* Initialize data */
      data = 0;
      if(staticTrue)
      {
          {
  #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
          }
      }
      if(staticTrue)
      {
          {
              /* POTENTIAL FLAW: Decrementing data could cause an underflow */
              --data;
              int result = data;
              printIntLine(result);
          }
      }
  }
  
  #endif /* OMITBAD */
  
  #ifndef OMITGOOD
  
  /* goodB2G1() - use badsource and goodsink by changing the second staticTrue to staticFalse */
  static void goodB2G1()
  {
      int data;
      /* Initialize data */
      data = 0;
      if(staticTrue)
      {
          {
  #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
          }
      }
      if(staticFalse)
      {
          /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
          printLine("Benign, fixed string");
      }
      else
      {
          /* FIX: Add a check to prevent an underflow from occurring */
          if (data > INT_MIN)
          {
              --data;
              int result = data;
              printIntLine(result);
          }
          else
          {
              printLine("data value is too large to perform arithmetic safely.");
          }
      }
  }
  
  /* goodB2G2() - use badsource and goodsink by reversing the blocks in the second if */
  static void goodB2G2()
  {
      int data;
      /* Initialize data */
      data = 0;
      if(staticTrue)
      {
          {
  #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
          }
      }
      if(staticTrue)
      {
          /* FIX: Add a check to prevent an underflow from occurring */
          if (data > INT_MIN)
          {
              --data;
              int result = data;
              printIntLine(result);
          }
          else
          {
              printLine("data value is too large to perform arithmetic safely.");
          }
      }
  }
  
  /* goodG2B1() - use goodsource and badsink by changing the first staticTrue to staticFalse */
  static void goodG2B1()
  {
      int data;
      /* Initialize data */
      data = 0;
      if(staticFalse)
      {
          /* INCIDENTAL: CWE 561 Dead Code, the code below will never run */
          printLine("Benign, fixed string");
      }
      else
      {
          /* FIX: Use a small, non-zero value that will not cause an integer underflow in the sinks */
          data = -2;
      }
      if(staticTrue)
      {
          {
              /* POTENTIAL FLAW: Decrementing data could cause an underflow */
              --data;
              int result = data;
              printIntLine(result);
          }
      }
  }
  
  /* goodG2B2() - use goodsource and badsink by reversing the blocks in the first if */
  static void goodG2B2()
  {
      int data;
      /* Initialize data */
      data = 0;
      if(staticTrue)
      {
          /* FIX: Use a small, non-zero value that will not cause an integer underflow in the sinks */
          data = -2;
      }
      if(staticTrue)
      {
          {
              /* POTENTIAL FLAW: Decrementing data could cause an underflow */
              --data;
              int result = data;
              printIntLine(result);
          }
      }
  }
  
  void CWE191_Integer_Underflow__int_listen_socket_predec_05_good()
  {
      goodB2G1();
      goodB2G2();
      goodG2B1();
      goodG2B2();
  }
  
  #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()...");
      CWE191_Integer_Underflow__int_listen_socket_predec_05_good();
      printLine("Finished good()");
  #endif /* OMITGOOD */
  #ifndef OMITBAD
      printLine("Calling bad()...");
      CWE191_Integer_Underflow__int_listen_socket_predec_05_bad();
      printLine("Finished bad()");
  #endif /* OMITBAD */
      return 0;
  }
  
  #endif
  