You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
92 lines
2.2 KiB
92 lines
2.2 KiB
/*++
|
|
|
|
Copyright (c) 2000 Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
CorrectOpenFileExclusive.cpp
|
|
|
|
Abstract:
|
|
|
|
On Win9x, opening a file for exclusive access will fail if the file is
|
|
already opened. WinNT will allow the exclusive open to succeed.
|
|
|
|
This shim will force CreateFile to fail exclusive open if the file is
|
|
already opened.
|
|
|
|
History:
|
|
|
|
11/10/2000 robkenny created
|
|
|
|
--*/
|
|
|
|
#include "precomp.h"
|
|
|
|
IMPLEMENT_SHIM_BEGIN(CorrectOpenFileExclusive)
|
|
#include "ShimHookMacro.h"
|
|
|
|
APIHOOK_ENUM_BEGIN
|
|
APIHOOK_ENUM_ENTRY(OpenFile )
|
|
APIHOOK_ENUM_END
|
|
|
|
HFILE
|
|
APIHOOK(OpenFile)(
|
|
LPCSTR lpFileName, // file name
|
|
LPOFSTRUCT lpReOpenBuff, // file information
|
|
UINT uStyle // action and attributes
|
|
)
|
|
{
|
|
if (uStyle & OF_SHARE_EXCLUSIVE)
|
|
{
|
|
// We need to check to see if the file is already open.
|
|
// We can do a fairly good job by attempting to open it
|
|
// with read, write and execute access, which will only succeed
|
|
// if all other handles to the object are have shared the file for RWE.
|
|
|
|
DWORD CreateDisposition = OPEN_EXISTING;
|
|
if (uStyle & OF_CREATE )
|
|
{
|
|
CreateDisposition = CREATE_ALWAYS;
|
|
}
|
|
|
|
HANDLE hFile = CreateFileA(
|
|
lpFileName,
|
|
GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE,
|
|
0, // No sharing allowed
|
|
NULL,
|
|
CreateDisposition,
|
|
0,
|
|
NULL
|
|
);
|
|
|
|
if (hFile == INVALID_HANDLE_VALUE)
|
|
{
|
|
LOGN( eDbgLevelError, "Force CreateFile exclusive open to fail since file %s is already opened.", lpFileName);
|
|
|
|
lpReOpenBuff->nErrCode = (WORD) GetLastError();
|
|
return (HFILE)HandleToUlong(INVALID_HANDLE_VALUE);
|
|
}
|
|
else
|
|
{
|
|
CloseHandle(hFile);
|
|
}
|
|
}
|
|
|
|
HFILE returnValue = ORIGINAL_API(OpenFile)(
|
|
lpFileName, lpReOpenBuff, uStyle);
|
|
|
|
return (HFILE)HandleToUlong(returnValue);
|
|
}
|
|
|
|
/*++
|
|
|
|
Register hooked functions
|
|
|
|
--*/
|
|
|
|
HOOK_BEGIN
|
|
APIHOOK_ENTRY(KERNEL32.DLL, OpenFile)
|
|
HOOK_END
|
|
|
|
IMPLEMENT_SHIM_END
|
|
|