550 lines
12 KiB
C++
550 lines
12 KiB
C++
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/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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LimitFindFile.cpp
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Abstract:
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This shim was originally intended for QuickTime's qt32inst.exe which
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did a breadth-first search of the directory tree and would overflow
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the buffer in which it was keeping a list of subdirs yet to visit.
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With this shim you can limit the number of files that a single FindFile
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search will return, you can limit the number of subdirectories (aka the
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branching factor) returned, you can limit the "depth" to which any
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FindFile search will locate files, and you can specify whether these
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limits should be applied to all FindFiles or only fully-qualified FindFiles.
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You can also request that FindFile return only short filenames.
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The shim's arguments are:
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DEPTH=#
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BRANCH=#
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FILES=#
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SHORTFILENAMES or LONGFILENAMES
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LIMITRELATIVE or ALLOWRELATIVE
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The default behavior is:
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SHORTFILENAMES
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DEPTH = 4
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ALLOWRELATIVE
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... but if any command line is specified, the behavior is only that which
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is specified on the command line (no default behavior).
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An example command line:
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COMMAND_LINE="FILES=100 LIMITRELATIVE"
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Which would limit every FindFile search to returning 100 or fewer files (but
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still returning any and all subdirectories).
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Note: Depth is a bit tricky. The method used is to count backslashes, so
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limiting depth to zero will allow no files to be found ("C:\autorun.bat" has
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1 backslash).
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History:
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08/24/2000 t-adams Created
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(LimitFindFile)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(FindFirstFileA)
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APIHOOK_ENUM_ENTRY(FindNextFileA)
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APIHOOK_ENUM_ENTRY(FindClose)
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APIHOOK_ENUM_END
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// Linked list of FindFileHandles
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struct FFNode
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{
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FFNode *next;
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HANDLE hFF;
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DWORD dwBranches;
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DWORD dwFiles;
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};
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FFNode *g_FFList = NULL;
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// Default behaviors - overridden by Commandline
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BOOL g_bUseShortNames = TRUE;
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BOOL g_bLimitDepth = TRUE;
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DWORD g_dwDepthLimit = 4;
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BOOL g_bLimitRelative = FALSE;
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BOOL g_bLimitBranch = FALSE;
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DWORD g_dwBranchLimit = 0;
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BOOL g_bLimitFiles = FALSE;
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DWORD g_dwFileLimit = 0;
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/*++
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Abstract:
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ApplyLimits applys the recently found file from lpFindFileData to the
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current node, checks that none of the limits have been violated, and
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shortens the filename if requested.
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It returns TRUE if within limits, FALSE if limits have been exceeded.
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History:
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08/24/2000 t-adams Created
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--*/
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BOOL ApplyLimits(FFNode *pFFNode, LPWIN32_FIND_DATAA lpFindFileData)
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{
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BOOL bRet = TRUE;
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// If it's a directory
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if ( lpFindFileData->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY )
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{
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pFFNode->dwBranches++;
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if ( g_bLimitBranch && pFFNode->dwBranches > g_dwBranchLimit )
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{
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bRet = FALSE;
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goto exit;
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}
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}
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else
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{ // else it's a file
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pFFNode->dwFiles++;
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if ( g_bLimitFiles && pFFNode->dwFiles > g_dwFileLimit )
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{
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bRet = FALSE;
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goto exit;
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}
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}
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// Change to short name if requested
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if ( g_bUseShortNames && NULL != lpFindFileData->cAlternateFileName[0])
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{
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_tcscpy(lpFindFileData->cFileName, lpFindFileData->cAlternateFileName);
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lpFindFileData->cAlternateFileName[0] = NULL;
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}
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exit:
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return bRet;
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}
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/*++
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Abstract:
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CheckDepthLimit checks to see if the depth of the requested search
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is greater than is allowed. If we are limiting relative paths, then
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the current directory is prepended to the requested search string.
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It returns TRUE if within limits, FALSE if limits have been exceeded.
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History:
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08/24/2000 t-adams Created
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--*/
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BOOL
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CheckDepthLimit(const CString & csFileName)
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{
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BOOL bRet = TRUE;
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CSTRING_TRY
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{
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// Check the depth of the requested file
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if ( g_bLimitDepth )
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{
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DWORD dwDepth = -1;
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int nIndex = 0;
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do
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{
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dwDepth += 1;
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nIndex = csFileName.Find(L'\\', nIndex);
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}
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while( nIndex >= 0 );
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if ( dwDepth > g_dwDepthLimit )
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{
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bRet = FALSE;
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}
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}
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}
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CSTRING_CATCH
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{
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// Do nothing
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}
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return bRet;
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}
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/*++
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Abstract:
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This function checks the depth of the requested search (see comments above).
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If the depth check passes it performs the search, request limit application,
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and finally returns a successful handle only if within all limits.
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History:
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08/24/2000 t-adams Created
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--*/
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HANDLE
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APIHOOK(FindFirstFileA)(
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LPCSTR lpFileName,
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LPWIN32_FIND_DATAA lpFindFileData)
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{
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HANDLE hRet = INVALID_HANDLE_VALUE;
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FFNode *pFFNode = NULL;
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BOOL bRelPath = FALSE;
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CString csFileName(lpFileName);
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// Determine if the path is relative to the CWD:
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CString csDrive;
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csFileName.GetDrivePortion(csDrive);
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bRelPath = csDrive.IsEmpty();
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// If it is a relative path & we're not limiting such, then just do
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// the FindFile and get out.
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if ( bRelPath)
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{
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if (!g_bLimitRelative)
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{
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return ORIGINAL_API(FindFirstFileA)(lpFileName, lpFindFileData);
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}
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// We need to expand the directory portion of lpFileName to its full path
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CString csPath;
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CString csFile;
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csFileName.GetNotLastPathComponent(csPath);
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csFileName.GetLastPathComponent(csFile);
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csPath.GetFullPathNameW();
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csPath.AppendPath(csFile);
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csFileName = csPath;
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// Check the depth limit
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if ( !CheckDepthLimit(csFileName) )
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{
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return INVALID_HANDLE_VALUE;
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}
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}
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hRet = ORIGINAL_API(FindFirstFileA)(lpFileName, lpFindFileData);
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if ( INVALID_HANDLE_VALUE == hRet )
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{
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return hRet;
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}
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// Make a new node for this handle
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pFFNode = (FFNode *) malloc(sizeof FFNode);
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if ( !pFFNode )
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{
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// Don't close the find, maybe it could still work for the app.
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goto exit;
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}
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pFFNode->hFF = hRet;
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pFFNode->dwBranches = 0;
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pFFNode->dwFiles = 0;
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// Apply our limits until we get a passable find
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while( !ApplyLimits(pFFNode, lpFindFileData) )
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{
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// If there are no more files to find, clean up & exit
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// else loop back & ApplyLimits again
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if ( !FindNextFileA(hRet, lpFindFileData) )
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{
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free(pFFNode);
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FindClose(hRet);
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hRet = INVALID_HANDLE_VALUE;
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goto exit;
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}
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}
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// We are clear to add this node to the global list
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pFFNode->next = g_FFList;
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g_FFList = pFFNode;
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exit:
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return hRet;
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}
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/*++
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Abstract:
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This function continues a limited search given the search's handle.
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History:
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08/24/2000 t-adams Created
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--*/
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BOOL
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APIHOOK(FindNextFileA)(
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HANDLE hFindFile,
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LPWIN32_FIND_DATAA lpFindFileData)
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{
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FFNode *pFFNode = NULL;
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BOOL bRet = ORIGINAL_API(FindNextFileA)(hFindFile, lpFindFileData);
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if ( !bRet )
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{
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goto exit;
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}
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// Find our node in the global list
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pFFNode = g_FFList;
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while( pFFNode )
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{
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if ( pFFNode->hFF == hFindFile )
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{
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break;
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}
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pFFNode = pFFNode->next;
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}
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// We don't keep track of relative-path searches if we're not
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// limiting such.
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if ( pFFNode == NULL )
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{
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goto exit;
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}
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// Apply our limits until we get a passable find
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while( !ApplyLimits(pFFNode, lpFindFileData) )
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{
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// If there are no more files to find return FALSE
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// else loop back & ApplyLimits again
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if ( !FindNextFileA(hFindFile, lpFindFileData) )
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{
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bRet = FALSE;
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goto exit;
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}
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}
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exit:
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return bRet;
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}
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/*++
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Abstract:
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This function closes a search, cleaning up the structures used
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in keeping track of the limits.
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History:
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08/24/2000 t-adams Created
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--*/
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BOOL
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APIHOOK(FindClose)(
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HANDLE hFindFile)
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{
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FFNode *pFFNode, *prev;
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BOOL bRet = ORIGINAL_API(FindClose)(hFindFile);
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// Find the node that matches the handle
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pFFNode = g_FFList;
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prev = NULL;
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while( pFFNode )
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{
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if ( pFFNode->hFF == hFindFile )
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{
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// Remove this node from this list
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if ( prev )
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{
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prev->next = pFFNode->next;
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}
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else
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{
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g_FFList = pFFNode->next;
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}
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free(pFFNode);
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pFFNode = NULL;
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break;
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}
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prev = pFFNode;
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pFFNode = pFFNode->next;
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}
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return bRet;
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}
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/*++
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Abstract:
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This function parses the command line.
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See the top of the file for valid arguments.
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History:
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08/24/2000 t-adams Created
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--*/
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// This module has been given an official blessing to use the str routines.
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#include "LegalStr.h"
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VOID
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ParseCommandLine( LPCSTR lpCommandLine )
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{
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char seps[] = " ,\t;:=";
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BOOL *pbOption = NULL;
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DWORD *pdwValue = NULL;
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char *token = NULL;
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// Since strtok modifies the string, we need to copy it
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LPSTR szCommandLine = (LPSTR) malloc(strlen(lpCommandLine)+1);
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if (!szCommandLine)
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{
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goto Exit;
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}
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strcpy(szCommandLine, lpCommandLine);
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// If there is a command line, reset the default behavior
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if ( NULL != *szCommandLine )
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{
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g_bLimitDepth = FALSE;
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g_bLimitBranch = FALSE;
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g_bLimitFiles = FALSE;
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g_bUseShortNames = FALSE;
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}
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// Run the command line
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token = _strtok(szCommandLine, seps);
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while (token)
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{
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// If we're looking for a value
|
||
|
|
if ( pdwValue )
|
||
|
|
{
|
||
|
|
*pdwValue = atol(token);
|
||
|
|
pdwValue = NULL;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{ // We're expecting a keyword
|
||
|
|
if ( strcmp("DEPTH", token) == 0 )
|
||
|
|
{
|
||
|
|
g_bLimitDepth = TRUE;
|
||
|
|
pdwValue = &g_dwDepthLimit;
|
||
|
|
}
|
||
|
|
else if ( strcmp("BRANCH", token) == 0 )
|
||
|
|
{
|
||
|
|
g_bLimitBranch = TRUE;
|
||
|
|
pdwValue = &g_dwBranchLimit;
|
||
|
|
}
|
||
|
|
else if ( strcmp("FILES", token) == 0 )
|
||
|
|
{
|
||
|
|
g_bLimitFiles = TRUE;
|
||
|
|
pdwValue = &g_dwFileLimit;
|
||
|
|
}
|
||
|
|
else if ( strcmp("SHORTFILENAMES", token) == 0)
|
||
|
|
{
|
||
|
|
g_bUseShortNames = TRUE;
|
||
|
|
// Don't need a value here
|
||
|
|
}
|
||
|
|
else if ( strcmp("LONGFILENAMES", token) == 0)
|
||
|
|
{
|
||
|
|
g_bUseShortNames = FALSE;
|
||
|
|
// Don't need a value here
|
||
|
|
}
|
||
|
|
else if ( strcmp("LIMITRELATIVE", token) == 0)
|
||
|
|
{
|
||
|
|
g_bLimitRelative = TRUE;
|
||
|
|
// Don't need a value here
|
||
|
|
}
|
||
|
|
else if ( strcmp("ALLOWRELATIVE", token) == 0)
|
||
|
|
{
|
||
|
|
g_bLimitRelative = FALSE;
|
||
|
|
// Don't need a value here
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Get the next token
|
||
|
|
token = _strtok(NULL, seps);
|
||
|
|
}
|
||
|
|
|
||
|
|
Exit:
|
||
|
|
if (szCommandLine)
|
||
|
|
{
|
||
|
|
free(szCommandLine);
|
||
|
|
}
|
||
|
|
//
|
||
|
|
// Dump results of command line parse
|
||
|
|
//
|
||
|
|
|
||
|
|
DPFN( eDbgLevelInfo, "===================================\n");
|
||
|
|
DPFN( eDbgLevelInfo, " Limit FindFile \n");
|
||
|
|
DPFN( eDbgLevelInfo, "===================================\n");
|
||
|
|
if ( g_bLimitDepth )
|
||
|
|
{
|
||
|
|
DPFN( eDbgLevelInfo, " Depth = %d\n", g_dwDepthLimit);
|
||
|
|
}
|
||
|
|
if ( g_bLimitBranch )
|
||
|
|
{
|
||
|
|
DPFN( eDbgLevelInfo, " Branch = %d\n", g_dwBranchLimit);
|
||
|
|
}
|
||
|
|
if ( g_bLimitFiles )
|
||
|
|
{
|
||
|
|
DPFN( eDbgLevelInfo, " Files = %d\n", g_dwFileLimit);
|
||
|
|
}
|
||
|
|
if ( g_bLimitRelative )
|
||
|
|
{
|
||
|
|
DPFN( eDbgLevelInfo, " Limiting Relative Paths.\n");
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
DPFN( eDbgLevelInfo, " Not Limiting Relative Paths.\n");
|
||
|
|
}
|
||
|
|
if ( g_bUseShortNames )
|
||
|
|
{
|
||
|
|
DPFN( eDbgLevelInfo, " Using short file names.\n");
|
||
|
|
}
|
||
|
|
|
||
|
|
DPFN( eDbgLevelInfo, "-----------------------------------\n");
|
||
|
|
}
|
||
|
|
|
||
|
|
BOOL
|
||
|
|
NOTIFY_FUNCTION(
|
||
|
|
DWORD fdwReason)
|
||
|
|
{
|
||
|
|
if (fdwReason == DLL_PROCESS_ATTACH)
|
||
|
|
{
|
||
|
|
ParseCommandLine(COMMAND_LINE);
|
||
|
|
}
|
||
|
|
|
||
|
|
return TRUE;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*++
|
||
|
|
|
||
|
|
Register hooked functions
|
||
|
|
|
||
|
|
--*/
|
||
|
|
|
||
|
|
HOOK_BEGIN
|
||
|
|
|
||
|
|
APIHOOK_ENTRY(KERNEL32.DLL, FindFirstFileA)
|
||
|
|
APIHOOK_ENTRY(KERNEL32.DLL, FindNextFileA)
|
||
|
|
APIHOOK_ENTRY(KERNEL32.DLL, FindClose)
|
||
|
|
CALL_NOTIFY_FUNCTION
|
||
|
|
|
||
|
|
HOOK_END
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
IMPLEMENT_SHIM_END
|
||
|
|
|