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1484 lines
39 KiB
1484 lines
39 KiB
/**********************************************************************/
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/** Microsoft Windows NT **/
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/** Copyright(c) Microsoft Corp., 1998 **/
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/**********************************************************************/
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/*
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fileopen.cxx
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This module contains the functions for creating and closing
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cached file information.
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FILE HISTORY:
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MCourage 09-Dec-1997 Created
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*/
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#include <tsunami.hxx>
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#include "filecach.hxx"
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#include "filehash.hxx"
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#include "tsunamip.hxx"
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#include "tlcach.h"
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#include <mbstring.h>
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#include <atq.h>
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#include "dbgutil.h"
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extern CFileCacheStats * g_pFileCacheStats;
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extern BOOL DisableTsunamiCaching;
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//
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// globals
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//
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DWORD g_dwFileCacheByteThreshold;
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DWORDLONG g_dwMemCacheSize;
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BOOL g_bEnableSequentialRead;
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//
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// Private functions
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//
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LPTS_OPEN_FILE_INFO TspOpenFile( LPCSTR pszName, HANDLE hUser, DWORD dwOptions );
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LPTS_OPEN_FILE_INFO TspOpenCachedFile( LPCSTR pszName, HANDLE hUser, DWORD dwOptions );
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BOOL TspOpenCachedFileHelper( LPCSTR pszName, HANDLE hUser, TS_OPEN_FILE_INFO * pOpenFile, DWORD dwOptions );
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DWORD TspMakeWidePath( LPCSTR pszName, DWORD cchWideName, BOOL bNoParse, LPWSTR pwszWideName );
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//
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// flags to set on CreateFile
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//
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DWORD TsCreateFileShareMode = (FILE_SHARE_READ |
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FILE_SHARE_WRITE |
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FILE_SHARE_DELETE);
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DWORD TsCreateFileFlags = (FILE_FLAG_OVERLAPPED |
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FILE_FLAG_BACKUP_SEMANTICS |
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FILE_DIRECTORY_FILE );
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const SECURITY_INFORMATION TsSecurityInfo
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= OWNER_SECURITY_INFORMATION
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| GROUP_SECURITY_INFORMATION
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| DACL_SECURITY_INFORMATION;
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//
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// macros
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//
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#define LockUriInfo() ( EnterCriticalSection( &g_csUriInfo ) )
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#define UnlockUriInfo() ( LeaveCriticalSection( &g_csUriInfo ) )
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LPTS_OPEN_FILE_INFO
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TsCreateFile(
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IN const TSVC_CACHE &TSvcCache,
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IN LPCSTR pszName,
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IN HANDLE OpeningUser,
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IN DWORD dwOptions
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)
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/*++
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Routine Description:
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Opens a TS_OPEN_FILE_INFO. When the requested file is no longer
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needed, the client should close it with TsCloseHandle.
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Arguments:
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TSvcCache - An initialized TSVC_CACHE structure. (Ignored)
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lpszName - The name of the file
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OpeningUser - HANDLE for the user attempting the open
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dwOptions - Valid options are:
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TS_CACHING_DESIRED
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TS_NO_ACCESS_CHECK
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TS_DONT_CACHE_ACCESS_TOKEN
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TS_NOT_IMPERSONATED
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TS_USE_WIN32_CANON
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TS_FORBID_SHORT_NAMES
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Return Values:
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On success TsCreateFile returns a pointer to a TS_OPEN_FILE_INFO
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for the requested file. NULL is returned on failure. More error
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information can be obtained from GetLastError();
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--*/
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{
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TS_OPEN_FILE_INFO * pOpenFile = NULL;
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CHAR achUpName[MAX_PATH+1];
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BOOL bCacheToken = !(dwOptions & TS_DONT_CACHE_ACCESS_TOKEN);
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if (DisableTsunamiCaching) {
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dwOptions &= ~TS_CACHING_DESIRED;
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}
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//
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// This assert doesn't work on workstation, but it would
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// be nice.
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//
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// DBG_ASSERT( (~TsValidCreateFileOptions & dwOptions) == 0 );
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//
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dwOptions &= TsValidCreateFileOptions;
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//
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// Make sure the path is upper case
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//
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IISstrncpy(achUpName, pszName, MAX_PATH);
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achUpName[MAX_PATH] = 0;
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_mbsupr(reinterpret_cast<PUCHAR>(achUpName));
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//
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// Disallow short file names as they break metabase equivalency
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// We do the expensive check anytime there's a tilde - number
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// sequence. If we find somebody used a short name we return file not found.
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// Note we revert if not on UNC since most systems have traverse checking
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// turned off.
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//
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if ( (dwOptions & TS_FORBID_SHORT_NAMES) &&
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strchr( pszName, '~' ))
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{
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DWORD err;
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BOOL fShort;
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//
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// CheckIfShortFileName() should be called unimpersonated
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//
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err = CheckIfShortFileName( (UCHAR *) pszName, OpeningUser, &fShort );
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if ( !err && fShort )
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{
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DBGPRINTF(( DBG_CONTEXT,
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"Short filename being rejected \"%s\"\n",
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pszName ));
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err = ERROR_FILE_NOT_FOUND;
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}
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if ( err )
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{
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SetLastError( err );
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return NULL;
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}
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}
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//
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// Try to get the file
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//
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if ( dwOptions & TS_CACHING_DESIRED ) {
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//
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// Look in the cache first
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//
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if ( CheckoutFile(achUpName, FCF_FOR_IO, &pOpenFile) ) {
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//
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// Make sure we can really use this handle
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//
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if ( ( !(dwOptions & TS_NO_ACCESS_CHECK) ) &&
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( !pOpenFile->AccessCheck(OpeningUser, bCacheToken) ) ) {
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CheckinFile(pOpenFile, FCF_FOR_IO);
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//
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// Return Access Denied
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//
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pOpenFile = NULL;
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SetLastError(ERROR_ACCESS_DENIED);
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}
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} else if ( GetLastError() == ERROR_FILE_NOT_FOUND ) {
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//
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// The file was not in the cache. Try to put it in.
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//
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pOpenFile = TspOpenCachedFile(achUpName, OpeningUser, dwOptions);
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}
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} else {
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//
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// We're not using the cache. Just open the file.
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//
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pOpenFile = TspOpenFile(achUpName, OpeningUser, dwOptions);
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}
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return pOpenFile;
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}
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LPTS_OPEN_FILE_INFO
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TsCreateFileFromURI(
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IN const TSVC_CACHE &TSvcCache,
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IN PW3_URI_INFO pURIInfo,
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IN HANDLE OpeningUser,
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IN DWORD dwOptions,
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IN DWORD *dwError
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)
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/*++
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Routine Description:
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Opens the TS_OPEN_FILE_INFO associated with the W3_URI_INFO argument. When
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the client is done with the file it should be closed with TsCloseURIFile.
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As a side effect, this routine will set the pOpenFileInfo, and
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dwFileOpenError in the pURIInfo structure.
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Arguments:
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TSvcCache - An initialized TSVC_CACHE structure.
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pURIInfo - Pointer to the W3_URI_INFO whose associated file should be opened
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OpeningUser - HANDLE for the user attempting the open
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dwOptions - Valid options are:
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TS_CACHING_DESIRED
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TS_NO_ACCESS_CHECK
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TS_DONT_CACHE_ACCESS_TOKEN
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TS_NOT_IMPERSONATED
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TS_USE_WIN32_CANON
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TS_FORBID_SHORT_NAMES
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dwError - On failure this DWORD will contain an error code
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Return Values:
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On success a pointer to the TS_OPEN_FILE_INFO is returned. On failure
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TsCreateFileFromURI returns NULL, and dwError is set to an error code.
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--*/
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{
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TS_OPEN_FILE_INFO * pOpenFile = NULL;
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DWORD err;
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BOOL bCacheToken = !(dwOptions & TS_DONT_CACHE_ACCESS_TOKEN);
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BOOL bInfoValid;
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//
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// This assert doesn't work on workstation, but it would
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// be nice.
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//
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// DBG_ASSERT( (~TsValidCreateFileOptions & dwOptions) == 0 );
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//
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dwOptions &= TsValidCreateFileOptions;
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if (DisableTsunamiCaching) {
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pOpenFile = TsCreateFile(TSvcCache,
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pURIInfo->pszName,
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OpeningUser,
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dwOptions);
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*dwError = GetLastError();
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return pOpenFile;
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}
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//
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// It seems that callers expect caching, but don't request it
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//
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dwOptions |= TS_CACHING_DESIRED;
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//
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// Assume no error
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//
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err = ERROR_SUCCESS;
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//
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// Try to get the file
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//
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bInfoValid = FALSE;
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LockUriInfo();
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pOpenFile = pURIInfo->pOpenFileInfo;
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if ( pOpenFile && CheckoutFileEntry(pOpenFile, FCF_FOR_IO) ) {
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bInfoValid = TRUE;
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}
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UnlockUriInfo();
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if ( bInfoValid ) {
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//
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// We've got a cached handle; make sure we're allowed to see it
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//
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if ( !pOpenFile->AccessCheck(OpeningUser, bCacheToken) ) {
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CheckinFile(pOpenFile, FCF_FOR_IO);
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//
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// Return Access Denied
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//
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pOpenFile = NULL;
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err = ERROR_ACCESS_DENIED;
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}
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} else {
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//
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// We've got either an invalid handle or no cached handle
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// at all.
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//
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if (pOpenFile) {
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//
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// The cached file handle is invalid
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//
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TS_OPEN_FILE_INFO * pOldFile;
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LockUriInfo();
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pOldFile = pURIInfo->pOpenFileInfo;
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pURIInfo->pOpenFileInfo = NULL;
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UnlockUriInfo();
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//
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// We've got an invalid entry checked out.
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// It's been checked out twice, once for I/O (above)
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// and once when it was first cached.
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//
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CheckinFile(pOpenFile, FCF_FOR_IO);
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//
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// Now we handle the reference that was cached in the
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// URI info structure. If someone else already removed
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// the reference, then pOldFile will be NULL, or a new
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// value.
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//
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if (pOldFile == pOpenFile) {
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//
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// We've got the reference all to ourselves so
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// we can delete it.
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//
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CheckinFile(pOpenFile, 0);
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} else if (pOldFile) {
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//
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// Someone else took care of the reference,
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// and cached a new one. It would be nice
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// if we could use it, but the file might have
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// already been flushed. If we go back to the
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// top, there's a chance that we'll loop forever.
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// Instead, we'll just get rid of this new
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// reference and pretend it was never there.
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//
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CheckinFile(pOldFile, 0);
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}
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}
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//
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// No file is cached. Try to open it.
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//
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pOpenFile = TsCreateFile(TSvcCache,
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pURIInfo->pszName,
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OpeningUser,
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dwOptions);
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//
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// Save the result.
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//
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if ( pOpenFile ) {
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if (dwOptions & TS_CACHING_DESIRED) {
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//
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// To save a copy of the info we need to reference it
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//
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if ( CheckoutFileEntry(pOpenFile, 0) ) {
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TS_OPEN_FILE_INFO * pOldFile;
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LockUriInfo();
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pOldFile = pURIInfo->pOpenFileInfo;
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pURIInfo->pOpenFileInfo = pOpenFile;
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UnlockUriInfo();
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//
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// Someone else might have written a value
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// into the URI info before we got to it, but
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// we'll show them. Our value stays while
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// theirs gets put back.
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//
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if (pOldFile) {
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CheckinFile(pOldFile, 0);
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}
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} else {
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//
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// It's been flushed, so we don't want to save it.
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//
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CheckinFile(pOpenFile, 0);
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}
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}
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} else {
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//
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// We couldn't open a file, so just record the error.
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//
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err = GetLastError();
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}
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}
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if ( err != ERROR_SUCCESS ) {
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*dwError = err;
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SetLastError(err);
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}
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return pOpenFile;
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}
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|
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BOOL
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TsCloseHandle(
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IN const TSVC_CACHE &TSvcCache,
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IN LPTS_OPEN_FILE_INFO pOpenFile
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)
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/*++
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Routine Description:
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Closes a TS_OPEN_FILE_INFO opened with TsCreateFile.
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Arguments:
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TSvcCache - An initialized TSVC_CACHE structure.
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pOpenFile - Pointer to the TS_OPEN_FILE_INFO to be closed
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Return Values:
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TRUE on success
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--*/
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{
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if ( pOpenFile->IsCached() ) {
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CheckinFile(pOpenFile, FCF_FOR_IO);
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} else {
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//
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// This is an uncached file. We can just get rid of it.
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//
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pOpenFile->CloseHandle();
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delete pOpenFile;
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}
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return TRUE;
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}
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BOOL
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TsCloseURIFile(
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IN LPTS_OPEN_FILE_INFO pOpenFile
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)
|
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/*++
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Routine Description:
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|
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|
Closes a TS_OPEN_FILE_INFO opened with TsCreateFileFromURI.
|
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|
|
Arguments:
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|
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pOpenFile - Pointer to the TS_OPEN_FILE_INFO to be closed
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|
Return Values:
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TRUE on success
|
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--*/
|
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{
|
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if ( pOpenFile ) {
|
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if ( pOpenFile->IsCached() ) {
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CheckinFile(pOpenFile, FCF_FOR_IO);
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} else {
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//
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// This is an uncached file. We can just get rid of it.
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//
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pOpenFile->CloseHandle();
|
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delete pOpenFile;
|
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}
|
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}
|
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return TRUE;
|
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}
|
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|
|
|
|
|
|
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BOOL
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TsDerefURIFile(
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IN LPTS_OPEN_FILE_INFO pOpenFile
|
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)
|
|
/*++
|
|
Routine Description:
|
|
|
|
When a W3_URI_INFO gets cleaned up, it needs to get rid
|
|
of it's reference to the file info by calling TsDerefURIFile.
|
|
|
|
Arguments:
|
|
|
|
pOpenFile - Pointer to the TS_OPEN_FILE_INFO to be derefed.
|
|
|
|
Return Values:
|
|
|
|
TRUE on success
|
|
--*/
|
|
{
|
|
CheckinFile(pOpenFile, 0);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
DWORD
|
|
TsMakeWidePath(
|
|
LPCSTR pszName,
|
|
LPWSTR pwszName,
|
|
DWORD dwWLen)
|
|
/*++
|
|
Routine Description:
|
|
|
|
Wrapper to expose an internal utily routine: TspMakeWidePath
|
|
|
|
Arguments:
|
|
|
|
pszName - Input ANSI file path
|
|
pwszName- output UNICODE name
|
|
dwWLen - length of output buffer (in unicode chars)
|
|
|
|
Return Values:
|
|
|
|
0 on error, length on success (excluding NIL)
|
|
--*/
|
|
{
|
|
DWORD cch;
|
|
|
|
if (!pszName || !*pszName || !pwszName || dwWLen <= 1) {
|
|
|
|
SetLastError( ERROR_INVALID_PARAMETER);
|
|
return 0;
|
|
}
|
|
|
|
cch = TspMakeWidePath(pszName, dwWLen - 1, TRUE, pwszName);
|
|
|
|
if (cch > 0) {
|
|
|
|
pwszName[cch] = L'\0';
|
|
}
|
|
|
|
return cch;
|
|
}
|
|
|
|
|
|
|
|
LPTS_OPEN_FILE_INFO
|
|
TspOpenFile(
|
|
LPCSTR pszName,
|
|
HANDLE hUser,
|
|
DWORD dwOptions
|
|
)
|
|
/*++
|
|
Routine Description:
|
|
|
|
Opens a non-cached TS_OPEN_FILE_INFO for TsCreateFile.
|
|
|
|
Arguments:
|
|
|
|
pszName - The name of the file
|
|
hUser - HANDLE for the user attempting the open
|
|
dwOptions - Valid options are:
|
|
TS_CACHING_DESIRED
|
|
TS_NO_ACCESS_CHECK
|
|
TS_DONT_CACHE_ACCESS_TOKEN (Ignored for non-cached case)
|
|
TS_NOT_IMPERSONATED
|
|
TS_USE_WIN32_CANON
|
|
|
|
Return Values:
|
|
|
|
On success returns a pointer to a TS_OPEN_FILE_INFO
|
|
for the requested file. NULL is returned on failure.
|
|
More error information can be gotten
|
|
from GetLastError(), which will return one of:
|
|
|
|
ERROR_INSUFFICIENT_BUFFER
|
|
ERROR_INVALID_NAME
|
|
ERROR_ACCESS_DENIED
|
|
ERROR_FILE_NOT_FOUND
|
|
ERROR_PATH_NOT_FOUND
|
|
ERROR_NOT_ENOUGH_MEMORY
|
|
--*/
|
|
{
|
|
TS_OPEN_FILE_INFO * pOpenFile;
|
|
HANDLE hFile;
|
|
WCHAR awchPath[MAX_PATH+8+1];
|
|
DWORD cchPath;
|
|
SECURITY_ATTRIBUTES sa;
|
|
BOOL bImpersonated;
|
|
BOOL bNoParse;
|
|
DWORD dwError = NO_ERROR;
|
|
PSECURITY_DESCRIPTOR pSecDesc;
|
|
DWORD dwSecDescSize;
|
|
DWORD dwSecDescSizeReq;
|
|
BOOL fSecDescAllocated;
|
|
|
|
bImpersonated = FALSE;
|
|
|
|
sa.nLength = sizeof(sa);
|
|
sa.lpSecurityDescriptor = NULL;
|
|
sa.bInheritHandle = FALSE;
|
|
|
|
//
|
|
// Allocate a file info object
|
|
//
|
|
pOpenFile = new TS_OPEN_FILE_INFO();
|
|
if (!pOpenFile || !pOpenFile->SetFileName(pszName)) {
|
|
//
|
|
// couldn't allocate an object
|
|
//
|
|
dwError = ERROR_NOT_ENOUGH_MEMORY;
|
|
goto err;
|
|
}
|
|
|
|
//
|
|
// Convert path to unicode
|
|
//
|
|
bNoParse = ! ( dwOptions & TS_USE_WIN32_CANON );
|
|
cchPath = TspMakeWidePath(pszName, MAX_PATH+8, bNoParse, awchPath);
|
|
if (!cchPath) {
|
|
//
|
|
// Path couldn't be converted
|
|
//
|
|
dwError = GetLastError();
|
|
goto err;
|
|
}
|
|
|
|
// avoid the infamous ::$DATA bug
|
|
|
|
if ( wcsstr( awchPath, L"::" ) )
|
|
{
|
|
dwError = ERROR_FILE_NOT_FOUND;
|
|
goto err;
|
|
}
|
|
|
|
//
|
|
// We may need to impersonate some other user to open the file
|
|
//
|
|
if ( (dwOptions & TS_NOT_IMPERSONATED) &&
|
|
!(dwOptions & TS_NO_ACCESS_CHECK) )
|
|
{
|
|
if ( !::ImpersonateLoggedOnUser( hUser ) )
|
|
{
|
|
DBGPRINTF(( DBG_CONTEXT,
|
|
"ImpersonateLoggedOnUser[%d] failed with %d\n",
|
|
hUser, GetLastError()));
|
|
//
|
|
// Return access denied
|
|
//
|
|
dwError = ERROR_ACCESS_DENIED;
|
|
|
|
goto err;
|
|
}
|
|
bImpersonated = TRUE;
|
|
}
|
|
|
|
DWORD dwFileAttributes;
|
|
if ((awchPath[cchPath-1] == L'.' || awchPath[cchPath-1] == L'\\') &&
|
|
((DWORD(-1) != (dwFileAttributes = GetFileAttributesW(awchPath))) &&
|
|
(!(dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)))) {
|
|
SetLastError(ERROR_FILE_NOT_FOUND);
|
|
hFile = INVALID_HANDLE_VALUE;
|
|
} else {
|
|
|
|
//
|
|
// Open the file
|
|
//
|
|
hFile = CreateFileW(
|
|
awchPath,
|
|
GENERIC_READ,
|
|
TsCreateFileShareMode,
|
|
&sa,
|
|
OPEN_EXISTING,
|
|
TsCreateFileFlags,
|
|
NULL);
|
|
}
|
|
|
|
if ( hFile == INVALID_HANDLE_VALUE ) {
|
|
dwError = GetLastError();
|
|
goto err;
|
|
}
|
|
|
|
//
|
|
// If our buffer wasn't big enough we have to get a new one.
|
|
//
|
|
pSecDesc = pOpenFile->QuerySecDesc();
|
|
dwSecDescSize = SECURITY_DESC_DEFAULT_SIZE;
|
|
fSecDescAllocated = FALSE;
|
|
while(1) {
|
|
//
|
|
// get the security descriptor
|
|
//
|
|
if (GetKernelObjectSecurity(hFile,
|
|
OWNER_SECURITY_INFORMATION
|
|
| GROUP_SECURITY_INFORMATION
|
|
| DACL_SECURITY_INFORMATION,
|
|
pSecDesc,
|
|
dwSecDescSize,
|
|
&dwSecDescSizeReq)) {
|
|
break;
|
|
}
|
|
else {
|
|
if (fSecDescAllocated)
|
|
{
|
|
FREE(pSecDesc);
|
|
}
|
|
pSecDesc = NULL;
|
|
|
|
if (ERROR_INSUFFICIENT_BUFFER != GetLastError()) {
|
|
//
|
|
// We got some error other than not enough buffer.
|
|
// Fail the whole request.
|
|
//
|
|
dwError = GetLastError();
|
|
::CloseHandle(hFile);
|
|
hFile = INVALID_HANDLE_VALUE;
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
dwSecDescSize = ((dwSecDescSizeReq + SECURITY_DESC_GRANULARITY - 1)
|
|
/ SECURITY_DESC_GRANULARITY) * SECURITY_DESC_GRANULARITY;
|
|
|
|
pSecDesc = ALLOC(dwSecDescSize);
|
|
if (!pSecDesc) {
|
|
dwError = ERROR_NOT_ENOUGH_MEMORY;
|
|
::CloseHandle(hFile);
|
|
hFile = INVALID_HANDLE_VALUE;
|
|
goto err;
|
|
}
|
|
|
|
fSecDescAllocated = TRUE;
|
|
}
|
|
|
|
//
|
|
// Fetch file information
|
|
//
|
|
BY_HANDLE_FILE_INFORMATION FileInfo;
|
|
|
|
if (!GetFileInformationByHandle( hFile, &FileInfo)) {
|
|
dwError = GetLastError();
|
|
::CloseHandle(hFile);
|
|
hFile = INVALID_HANDLE_VALUE;
|
|
goto err;
|
|
}
|
|
|
|
//
|
|
// Store the file information
|
|
//
|
|
pOpenFile->SetFileInfo(
|
|
hFile,
|
|
hUser,
|
|
pSecDesc,
|
|
dwSecDescSize,
|
|
&FileInfo
|
|
);
|
|
|
|
if ( bImpersonated ) {
|
|
::RevertToSelf();
|
|
}
|
|
|
|
pOpenFile->TraceCheckpointEx(TS_MAGIC_CREATE_NC, 0, 0);
|
|
|
|
return pOpenFile;
|
|
|
|
err:
|
|
if ( bImpersonated ) {
|
|
::RevertToSelf();
|
|
}
|
|
|
|
if (pOpenFile) {
|
|
delete pOpenFile;
|
|
}
|
|
|
|
SetLastError(dwError);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
LPTS_OPEN_FILE_INFO
|
|
TspOpenCachedFile(
|
|
LPCSTR pszName,
|
|
HANDLE hUser,
|
|
DWORD dwOptions
|
|
)
|
|
/*++
|
|
Routine Description:
|
|
|
|
Helper function for TsCreateFile
|
|
|
|
Opens a TS_OPEN_FILE_INFO and puts it in the file cache.
|
|
We want to make sure that each file only gets opened once,
|
|
so first we put an uninitialized file entry in the cache.
|
|
If the open succeeds, we tell the cache that the file is
|
|
ready for use. Otherwise we decache it.
|
|
|
|
Arguments:
|
|
|
|
pszName - The name of the file
|
|
OpeningUser - HANDLE for the user attempting the open
|
|
dwOptions - Valid options are:
|
|
TS_CACHING_DESIRED
|
|
TS_NO_ACCESS_CHECK
|
|
TS_DONT_CACHE_ACCESS_TOKEN
|
|
TS_NOT_IMPERSONATED
|
|
TS_USE_WIN32_CANON
|
|
|
|
Return Values:
|
|
|
|
On success returns a pointer to a TS_OPEN_FILE_INFO
|
|
for the requested file. NULL is returned on failure.
|
|
More error information can be gotten
|
|
from GetLastError(), which will return one of:
|
|
|
|
ERROR_INSUFFICIENT_BUFFER
|
|
ERROR_INVALID_NAME
|
|
ERROR_ACCESS_DENIED
|
|
ERROR_FILE_NOT_FOUND
|
|
ERROR_PATH_NOT_FOUND
|
|
ERROR_NOT_ENOUGH_MEMORY
|
|
--*/
|
|
{
|
|
TS_OPEN_FILE_INFO *pOpenFile;
|
|
DWORD dwResult;
|
|
DWORD dwError = NO_ERROR;
|
|
|
|
DBG_ASSERT( !DisableTsunamiCaching );
|
|
|
|
//
|
|
// Allocate a file info object
|
|
//
|
|
pOpenFile = new TS_OPEN_FILE_INFO();
|
|
if (!pOpenFile || !pOpenFile->SetFileName(pszName)) {
|
|
//
|
|
// couldn't allocate an object
|
|
//
|
|
dwError = ERROR_NOT_ENOUGH_MEMORY;
|
|
goto err;
|
|
}
|
|
|
|
Retry:
|
|
|
|
//
|
|
// Add a cache entry to prevent others from opening the file simultaneously
|
|
//
|
|
dwResult = CacheFile(pOpenFile, FCF_UNINITIALIZED | FCF_FOR_IO);
|
|
|
|
if ( dwResult == TS_ERROR_OUT_OF_MEMORY ) {
|
|
dwError = ERROR_NOT_ENOUGH_MEMORY;
|
|
goto err;
|
|
}
|
|
|
|
|
|
if (dwResult == TS_ERROR_SUCCESS) {
|
|
//
|
|
// Open the file
|
|
//
|
|
if ( TspOpenCachedFileHelper(pszName, hUser, pOpenFile, dwOptions) ) {
|
|
//
|
|
// Tell the cache it worked
|
|
//
|
|
NotifyInitializedFile(pOpenFile);
|
|
} else {
|
|
//
|
|
// need to remove the entry in the cache
|
|
// since it's not valid.
|
|
//
|
|
// First we need an extra reference which we'll use to tell
|
|
// the cache that the file is initialized. Then we'll
|
|
// decache the file, and finally mark it initialized.
|
|
//
|
|
// The file can't be marked initialized before the decache,
|
|
// because then it might look like a successful open.
|
|
// We need the extra reference because calling decache
|
|
// gets rid of our original reference.
|
|
//
|
|
pOpenFile->TraceCheckpointEx(TS_MAGIC_OPLOCK_FAIL, 0, 0);
|
|
|
|
CheckoutFileEntry(pOpenFile, 0);
|
|
|
|
DecacheFile(pOpenFile, FCF_FOR_IO);
|
|
|
|
NotifyInitializedFile(pOpenFile);
|
|
CheckinFile(pOpenFile, 0);
|
|
|
|
pOpenFile = NULL;
|
|
|
|
dwError = GetLastError();
|
|
goto err;
|
|
}
|
|
} else {
|
|
TS_OPEN_FILE_INFO * pExisting = NULL;
|
|
|
|
DBG_ASSERT ( dwResult == TS_ERROR_ALREADY_CACHED );
|
|
|
|
//
|
|
// Someone beat us to it. Try to check it out.
|
|
//
|
|
if ( !CheckoutFile(pszName, FCF_FOR_IO, &pExisting) ) {
|
|
//
|
|
// It's been removed from the cache since our
|
|
// attempt to add it. Try again
|
|
//
|
|
|
|
goto Retry;
|
|
}
|
|
|
|
delete pOpenFile;
|
|
pOpenFile = pExisting;
|
|
|
|
}
|
|
|
|
|
|
return pOpenFile;
|
|
|
|
err:
|
|
if (pOpenFile) {
|
|
delete pOpenFile;
|
|
}
|
|
|
|
SetLastError(dwError);
|
|
return NULL;
|
|
}
|
|
|
|
|
|
BOOL
|
|
TspOpenCachedFileHelper(
|
|
LPCSTR pszName,
|
|
HANDLE hUser,
|
|
TS_OPEN_FILE_INFO * pOpenFile,
|
|
DWORD dwOptions
|
|
)
|
|
/*++
|
|
Routine Description:
|
|
|
|
This function actually attempts to open the file with AtqCreateFileW.
|
|
|
|
When we enable oplocks, ATQ will need a reference to the object.
|
|
Therefore AtqCreateFileW must somehow be modified to tell me whether
|
|
it has a reference or not. If ATQ has a reference, we tell the cache
|
|
so here.
|
|
|
|
Arguments:
|
|
|
|
pszName - The name of the file
|
|
OpeningUser - HANDLE for the user attempting the open
|
|
pOpenFile - the file info object to update on success
|
|
dwOptions - Valid options are:
|
|
TS_CACHING_DESIRED (should always be set here)
|
|
TS_NO_ACCESS_CHECK
|
|
TS_DONT_CACHE_ACCESS_TOKEN
|
|
TS_NOT_IMPERSONATED
|
|
TS_USE_WIN32_CANON
|
|
|
|
Return Values:
|
|
|
|
TRUE if the file was opened, and file information was set.
|
|
FALSE otherwise. More error information can be gotten
|
|
from GetLastError(), which will return one of:
|
|
|
|
ERROR_INSUFFICIENT_BUFFER
|
|
ERROR_INVALID_NAME
|
|
ERROR_ACCESS_DENIED
|
|
ERROR_FILE_NOT_FOUND
|
|
ERROR_PATH_NOT_FOUND
|
|
--*/
|
|
{
|
|
HANDLE hFile;
|
|
WCHAR awchPath[MAX_PATH+8+1];
|
|
DWORD cchPath;
|
|
DWORD dwError = NO_ERROR;
|
|
BOOL bSuccess;
|
|
BOOL bDirectory;
|
|
BOOL bSmallFile;
|
|
BOOL bImpersonated = FALSE;
|
|
BOOL bNoParse;
|
|
SECURITY_ATTRIBUTES sa;
|
|
PSECURITY_DESCRIPTOR pSecDesc;
|
|
DWORD dwSecDescSize;
|
|
DWORD dwSecDescSizeReq;
|
|
DWORD cbFileSize = 0;
|
|
DWORD cbBytesRequired;
|
|
PBYTE pBuffer = NULL;
|
|
HANDLE hCopyFile = INVALID_HANDLE_VALUE;
|
|
BY_HANDLE_FILE_INFORMATION FileInfo;
|
|
|
|
DBG_ASSERT(dwOptions & TS_CACHING_DESIRED);
|
|
|
|
bSuccess = FALSE;
|
|
dwSecDescSizeReq = 0;
|
|
|
|
//
|
|
// Assume it's not cacheable
|
|
//
|
|
bSmallFile = FALSE;
|
|
bDirectory = FALSE;
|
|
|
|
//
|
|
// set up security info
|
|
//
|
|
sa.nLength = sizeof(sa);
|
|
sa.lpSecurityDescriptor = NULL;
|
|
sa.bInheritHandle = FALSE;
|
|
|
|
//
|
|
// The open file info contains a buffer
|
|
// of the default size.
|
|
//
|
|
pSecDesc = pOpenFile->QuerySecDesc();
|
|
|
|
dwSecDescSize = SECURITY_DESC_DEFAULT_SIZE;
|
|
|
|
//
|
|
// Convert path to unicode
|
|
//
|
|
bNoParse = ! ( dwOptions & TS_USE_WIN32_CANON );
|
|
cchPath = TspMakeWidePath(pszName, MAX_PATH+8, bNoParse, awchPath);
|
|
|
|
if (!cchPath) {
|
|
//
|
|
// Path couldn't be converted
|
|
//
|
|
pSecDesc = NULL; // Don't free the default buffer.
|
|
dwError = GetLastError();
|
|
goto err;
|
|
}
|
|
|
|
// avoid the infamous ::$DATA bug
|
|
|
|
if ( wcsstr( awchPath, L"::" ) )
|
|
{
|
|
pSecDesc = NULL;
|
|
dwError = ERROR_FILE_NOT_FOUND;
|
|
goto err;
|
|
}
|
|
|
|
//
|
|
// We may need to impersonate some other user to open the file
|
|
//
|
|
if ( (dwOptions & TS_NOT_IMPERSONATED) &&
|
|
!(dwOptions & TS_NO_ACCESS_CHECK) )
|
|
{
|
|
if ( !::ImpersonateLoggedOnUser( hUser ) )
|
|
{
|
|
DBGPRINTF(( DBG_CONTEXT,
|
|
"ImpersonateLoggedOnUser[%d] failed with %d\n",
|
|
hUser, GetLastError()));
|
|
//
|
|
// Return access denied
|
|
//
|
|
|
|
pSecDesc = NULL;
|
|
dwError = ERROR_ACCESS_DENIED;
|
|
goto err;
|
|
}
|
|
bImpersonated = TRUE;
|
|
}
|
|
|
|
|
|
//
|
|
// Open the file
|
|
//
|
|
|
|
hFile = CreateFileW(
|
|
awchPath, // file name
|
|
GENERIC_READ, // access mode
|
|
TsCreateFileShareMode, // share mode
|
|
&sa, // SD
|
|
OPEN_EXISTING, // how to create
|
|
TsCreateFileFlags, // file attributes
|
|
NULL); // handle to template file
|
|
|
|
if ( hFile == INVALID_HANDLE_VALUE ) {
|
|
pSecDesc = NULL; // Don't free the default buffer.
|
|
dwError = GetLastError();
|
|
goto err;
|
|
}
|
|
|
|
//
|
|
// Get the security descriptor
|
|
// if the buffer is not big enough, code below will retry
|
|
// with a bigger buffer.
|
|
//
|
|
|
|
if (!GetKernelObjectSecurity(hFile,
|
|
OWNER_SECURITY_INFORMATION
|
|
| GROUP_SECURITY_INFORMATION
|
|
| DACL_SECURITY_INFORMATION,
|
|
pSecDesc,
|
|
dwSecDescSize,
|
|
&dwSecDescSizeReq)
|
|
&& (ERROR_INSUFFICIENT_BUFFER != GetLastError()) ) {
|
|
//
|
|
// We got some error other than not enough buffer.
|
|
// Fail the whole request.
|
|
//
|
|
pSecDesc = NULL;
|
|
dwError = GetLastError();
|
|
::CloseHandle(hFile);
|
|
hFile = INVALID_HANDLE_VALUE;
|
|
goto err;
|
|
}
|
|
|
|
//
|
|
// Fetch file information
|
|
//
|
|
|
|
if (!GetFileInformationByHandle( hFile, &FileInfo)) {
|
|
pSecDesc = NULL;
|
|
dwError = GetLastError();
|
|
::CloseHandle(hFile);
|
|
hFile = INVALID_HANDLE_VALUE;
|
|
goto err;
|
|
}
|
|
|
|
bDirectory = FileInfo.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY ? TRUE : FALSE;
|
|
|
|
|
|
// if the name ends with ('\' or '.')
|
|
// and it is NOT a directory, than fail 404
|
|
|
|
if ((awchPath[cchPath-1] == L'.' || awchPath[cchPath-1] == L'\\') && // suspect file name
|
|
!bDirectory) {
|
|
pSecDesc = NULL;
|
|
dwError = ERROR_FILE_NOT_FOUND;
|
|
::CloseHandle(hFile);
|
|
hFile = INVALID_HANDLE_VALUE;
|
|
goto err;
|
|
}
|
|
|
|
//
|
|
// do not cache encrypted files
|
|
//
|
|
|
|
BOOL bEncrypted = FileInfo.dwFileAttributes & FILE_ATTRIBUTE_ENCRYPTED ? TRUE : FALSE;
|
|
|
|
//
|
|
// If our buffer wasn't big enough we have to get a new one.
|
|
//
|
|
if (dwSecDescSizeReq > dwSecDescSize) {
|
|
//
|
|
// Code below shouldn't try to free our original buffer
|
|
//
|
|
pSecDesc = NULL;
|
|
|
|
//
|
|
// Keep getting the security descriptor until we have enough space.
|
|
//
|
|
|
|
while (dwSecDescSizeReq > dwSecDescSize) {
|
|
DBGPRINTF(( DBG_CONTEXT,
|
|
"Allocating a new Security Descriptor buffer! %d > %d\n",
|
|
dwSecDescSizeReq,
|
|
dwSecDescSize ));
|
|
|
|
dwSecDescSize = ((dwSecDescSizeReq + SECURITY_DESC_GRANULARITY - 1)
|
|
/ SECURITY_DESC_GRANULARITY) * SECURITY_DESC_GRANULARITY;
|
|
|
|
if (pSecDesc) {
|
|
FREE(pSecDesc);
|
|
}
|
|
|
|
pSecDesc = ALLOC(dwSecDescSize);
|
|
if (!pSecDesc) {
|
|
dwError = ERROR_NOT_ENOUGH_MEMORY;
|
|
goto err;
|
|
}
|
|
|
|
//
|
|
// get a new security descriptor
|
|
//
|
|
if (!GetKernelObjectSecurity(hFile,
|
|
OWNER_SECURITY_INFORMATION
|
|
| GROUP_SECURITY_INFORMATION
|
|
| DACL_SECURITY_INFORMATION,
|
|
pSecDesc,
|
|
dwSecDescSize,
|
|
&dwSecDescSizeReq)
|
|
&& (ERROR_INSUFFICIENT_BUFFER != GetLastError()) ) {
|
|
//
|
|
// We got some error other than not enough buffer.
|
|
// Fail the whole request.
|
|
//
|
|
dwError = GetLastError();
|
|
::CloseHandle(hFile);
|
|
hFile = INVALID_HANDLE_VALUE;
|
|
goto err;
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// Don't need to be impersonated anymore
|
|
//
|
|
if ( bImpersonated ) {
|
|
::RevertToSelf();
|
|
bImpersonated = FALSE;
|
|
}
|
|
|
|
//
|
|
// We don't need to hold the handle open for directories.
|
|
//
|
|
if (bDirectory) {
|
|
::CloseHandle(hFile);
|
|
hFile = INVALID_HANDLE_VALUE;
|
|
}
|
|
|
|
//
|
|
// If we're using a non cached token we don't want to save it
|
|
//
|
|
if (dwOptions & TS_DONT_CACHE_ACCESS_TOKEN) {
|
|
hUser = INVALID_HANDLE_VALUE;
|
|
}
|
|
|
|
//
|
|
// try to read the file into the memory cache
|
|
//
|
|
|
|
if ((FileInfo.nFileSizeHigh == 0) &&
|
|
(FileInfo.nFileSizeLow < g_dwFileCacheByteThreshold)
|
|
&& (hFile != INVALID_HANDLE_VALUE)) {
|
|
|
|
bSmallFile = TRUE;
|
|
cbFileSize = FileInfo.nFileSizeLow;
|
|
|
|
} else {
|
|
bSmallFile = FALSE;
|
|
}
|
|
|
|
if (bSmallFile && !bEncrypted) {
|
|
dwError = ReadFileIntoMemoryCache(
|
|
hFile,
|
|
cbFileSize,
|
|
&cbBytesRequired,
|
|
(PVOID *) &pBuffer
|
|
);
|
|
|
|
if (dwError == ERROR_SUCCESS) {
|
|
//
|
|
// it worked. dump the file handle
|
|
//
|
|
::CloseHandle(hFile);
|
|
hFile = INVALID_HANDLE_VALUE;
|
|
} else {
|
|
//
|
|
// we failed to make it into
|
|
// the cache, so don't cache
|
|
// this entry
|
|
//
|
|
bSmallFile = FALSE;
|
|
}
|
|
}
|
|
|
|
|
|
//
|
|
// Add file information to pOpenFile
|
|
//
|
|
pOpenFile->SetFileInfo(
|
|
hFile, // handle to the file
|
|
hUser, // user token, if we're supposed to cache it
|
|
pSecDesc, // security descriptor
|
|
dwSecDescSize, // size of security descriptor
|
|
&FileInfo, // file information
|
|
pBuffer // buffer contains contents of file
|
|
);
|
|
bSuccess = TRUE;
|
|
|
|
|
|
if (bEncrypted || (!bDirectory && !bSmallFile)) {
|
|
//
|
|
// This is a regular file that is too large
|
|
// for the cache, so don't cache it.
|
|
//
|
|
IF_DEBUG( OPLOCKS ) {
|
|
DBGPRINTF(( DBG_CONTEXT,
|
|
"Couldn't cache %8p \"%s\"\n",
|
|
pOpenFile, pOpenFile->GetKey()->m_pszFileName ));
|
|
}
|
|
|
|
CheckoutFileEntry(pOpenFile, 0);
|
|
DecacheFile(pOpenFile, 0);
|
|
}
|
|
|
|
//
|
|
// fall through to do cleanup
|
|
//
|
|
|
|
err:
|
|
|
|
if ( bImpersonated ) {
|
|
::RevertToSelf();
|
|
}
|
|
|
|
if ( !bSuccess ) {
|
|
if ( pSecDesc ) {
|
|
FREE(pSecDesc);
|
|
}
|
|
|
|
SetLastError(dwError);
|
|
}
|
|
|
|
return bSuccess;
|
|
}
|
|
|
|
DWORD
|
|
TspMakeWidePath(
|
|
IN LPCSTR pszName,
|
|
IN DWORD cchWideName,
|
|
IN BOOL bNoParse,
|
|
OUT LPWSTR pwszWideName
|
|
)
|
|
/*++
|
|
Routine Description:
|
|
|
|
This routine converts a path name from the local code page and
|
|
converts it to wide characters. In addition it adds a prefix
|
|
to the string, which is "\\?\UNC\" for a UNC path, and "\\?\" for
|
|
other paths. This prefix tells Windows not to parse the path.
|
|
|
|
Arguments:
|
|
|
|
IN pszName - The path to be converted
|
|
IN cchWideName - The size of the pwszWideName buffer
|
|
OUT pwszWideName - The converted path
|
|
|
|
Return Values:
|
|
|
|
On success we return the number of wide characters in the
|
|
converted path + the prefix.
|
|
|
|
On failure we return zero. More error information will be
|
|
returned by GetLastError(). The error code will be one of:
|
|
|
|
ERROR_INSUFFICIENT_BUFFER
|
|
ERROR_INVALID_NAME
|
|
--*/
|
|
{
|
|
DWORD cbPrefix=0;
|
|
LPCSTR pszPath;
|
|
DWORD cch=0;
|
|
|
|
if ( bNoParse ) {
|
|
if ( (pszName[0] == '\\') && (pszName[1] == '\\') )
|
|
{
|
|
CopyMemory(
|
|
pwszWideName,
|
|
L"\\\\?\\UNC\\",
|
|
(sizeof("\\\\?\\UNC\\")-1) * sizeof(WCHAR)
|
|
);
|
|
|
|
cbPrefix = sizeof("\\\\?\\UNC\\")-1;
|
|
pszPath = pszName + sizeof( "\\\\" ) -1;
|
|
}
|
|
else
|
|
{
|
|
CopyMemory(
|
|
pwszWideName,
|
|
L"\\\\?\\",
|
|
(sizeof("\\\\?\\")-1) * sizeof(WCHAR)
|
|
);
|
|
|
|
cbPrefix = sizeof("\\\\?\\")-1;
|
|
pszPath = pszName;
|
|
}
|
|
} else {
|
|
//
|
|
// We're not adding a prefix
|
|
//
|
|
cbPrefix = 0;
|
|
pszPath = pszName;
|
|
}
|
|
|
|
cch = MultiByteToWideChar( CP_ACP,
|
|
MB_PRECOMPOSED | MB_ERR_INVALID_CHARS,
|
|
pszPath,
|
|
-1,
|
|
pwszWideName + cbPrefix,
|
|
cchWideName - cbPrefix );
|
|
|
|
if ( !cch && (GetLastError() != ERROR_INSUFFICIENT_BUFFER) ) {
|
|
SetLastError(ERROR_INVALID_NAME);
|
|
|
|
return cch; // that is, return 0
|
|
}
|
|
|
|
return cch+cbPrefix-1; // return the string length without the ZERO
|
|
}
|
|
|
|
|
|
HANDLE
|
|
TS_OPEN_FILE_INFO::QueryFileHandle(
|
|
VOID
|
|
)
|
|
/*++
|
|
Routine Description:
|
|
|
|
Returns a handle to the file, which we may have to open.
|
|
|
|
Arguments:
|
|
|
|
None.
|
|
|
|
Return Values:
|
|
|
|
INVALID_HANDLE_VALUE on failure
|
|
--*/
|
|
{
|
|
HANDLE hFile = INVALID_HANDLE_VALUE;
|
|
HANDLE hOldFile;
|
|
|
|
Lock();
|
|
|
|
if (m_hFile == INVALID_HANDLE_VALUE) {
|
|
WCHAR awchPath[MAX_PATH+8+1];
|
|
DWORD cchPath;
|
|
|
|
//
|
|
// Convert path to unicode
|
|
//
|
|
cchPath = TspMakeWidePath(m_FileKey.m_pszFileName, MAX_PATH+8, FALSE, awchPath);
|
|
|
|
if (cchPath) {
|
|
DWORD dwFileAttributes;
|
|
|
|
// avoid the infamous ::$DATA bug
|
|
|
|
if ( wcsstr( awchPath, L"::" ) )
|
|
{
|
|
SetLastError(ERROR_FILE_NOT_FOUND);
|
|
} else if ((awchPath[cchPath-1] == L'.' || awchPath[cchPath-1] == L'\\') &&
|
|
((DWORD(-1) != (dwFileAttributes = GetFileAttributesW(awchPath))) &&
|
|
(!(dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)))) {
|
|
SetLastError(ERROR_FILE_NOT_FOUND);
|
|
} else {
|
|
SECURITY_ATTRIBUTES sa;
|
|
|
|
sa.nLength = sizeof(sa);
|
|
sa.lpSecurityDescriptor = NULL;
|
|
sa.bInheritHandle = FALSE;
|
|
|
|
//
|
|
// Open the file
|
|
//
|
|
hFile = CreateFileW(
|
|
awchPath,
|
|
GENERIC_READ,
|
|
TsCreateFileShareMode,
|
|
&sa,
|
|
OPEN_EXISTING,
|
|
TsCreateFileFlags,
|
|
NULL);
|
|
}
|
|
}
|
|
|
|
hOldFile = InterlockedExchangePointer(&m_hFile, hFile);
|
|
|
|
if (hOldFile != INVALID_HANDLE_VALUE) {
|
|
::CloseHandle(hOldFile);
|
|
}
|
|
|
|
Unlock();
|
|
|
|
//
|
|
// Decache this file
|
|
//
|
|
DecacheFile(this, FCF_NO_DEREF);
|
|
}
|
|
else
|
|
{
|
|
Unlock();
|
|
}
|
|
|
|
return m_hFile;
|
|
}
|
|
|
|
|
|
//
|
|
// fileopen.cxx
|
|
//
|
|
|