354 lines
12 KiB
C++
354 lines
12 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1996 - 2002.
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//
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// File : SMem.hxx
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//
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// Contents : Shared memory (named + file based)
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//
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// Classes : CNamedSharedMem
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//
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// History: 22-Mar-94 t-joshh Created
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//
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//----------------------------------------------------------------------------
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#pragma once
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#include <secutil.hxx>
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//+---------------------------------------------------------------------------
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//
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// Class: CNamedSharedMem
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//
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// Purpose: Named shared memory
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//
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// History: 22-Mar-94 t-joshh Created
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//
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//----------------------------------------------------------------------------
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class CNamedSharedMem
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{
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public:
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inline CNamedSharedMem( WCHAR const * pwszName, ULONG cb, SECURITY_DESCRIPTOR * psd = 0, BOOL fWrite = TRUE );
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CNamedSharedMem()
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: _hMap( 0 ),
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_pb( 0 )
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{
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}
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enum eNameType { AppendPid };
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CNamedSharedMem( WCHAR const * pwszName, eNameType eNT, ULONG cb )
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: _hMap( 0 ),
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_pb( 0 )
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{
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Win4Assert( eNT == CNamedSharedMem::AppendPid );
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unsigned ccName = wcslen( pwszName );
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WCHAR wcsNewName[MAX_PATH];
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RtlCopyMemory( wcsNewName, pwszName, ccName * sizeof(WCHAR) );
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_itow( GetCurrentProcessId(), wcsNewName + ccName, 16 );
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Init( wcsNewName, cb, 0 );
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}
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~CNamedSharedMem()
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{
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if ( 0 != _pb )
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UnmapViewOfFile( _pb );
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if ( 0 != _hMap )
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CloseHandle( _hMap );
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}
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BYTE * GetPointer() { return _pb; }
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BYTE * Get() { return _pb; }
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BOOL Ok() { return ( 0 != _pb ); }
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inline void Init( WCHAR const * pwszName, ULONG cb, SECURITY_DESCRIPTOR * psd = 0, BOOL fWrite = TRUE );
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void CreateForWriteFromRegKey( WCHAR const * pwszName,
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ULONG cb,
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WCHAR const * pwcRegKey )
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{
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Win4Assert( 0 == _hMap );
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Win4Assert( 0 == _pb );
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Win4Assert( 0 != pwcRegKey );
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_hMap = CreateFileMapping( INVALID_HANDLE_VALUE, // Map to page file
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0, // Security attributes
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PAGE_READWRITE, // Page-level protection
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0, // Size high
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cb, // size low
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pwszName ); // Name
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if ( 0 == _hMap )
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THROW( CException() );
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DWORD dwErr = CopyNamedDacls( pwszName, pwcRegKey );
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if ( NO_ERROR != dwErr )
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THROW( CException( HRESULT_FROM_WIN32( dwErr ) ) );
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_pb = (BYTE *) MapViewOfFile( _hMap, // Handle to map
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FILE_MAP_WRITE, // Access
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0, // Offset (high)
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0, // Offset (low)
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0 ); // Map all
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if ( 0 == _pb )
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{
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DWORD dwErr = GetLastError();
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CloseHandle( _hMap );
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_hMap = 0;
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THROW( CException( HRESULT_FROM_WIN32( dwErr ) ) );
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}
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}
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void CreateForWriteFromSA( WCHAR const * pwszName,
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ULONG cb,
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SECURITY_ATTRIBUTES & sa )
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{
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Win4Assert( 0 == _hMap );
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Win4Assert( 0 == _pb );
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_hMap = CreateFileMapping( INVALID_HANDLE_VALUE, // Map to page file
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&sa, // Security attributes
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PAGE_READWRITE, // Page-level protection
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0, // Size high
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cb, // size low
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pwszName ); // Name
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if ( 0 == _hMap )
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THROW( CException() );
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_pb = (BYTE *) MapViewOfFile( _hMap, // Handle to map
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FILE_MAP_WRITE, // Access
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0, // Offset (high)
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0, // Offset (low)
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0 ); // Map all
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if ( 0 == _pb )
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{
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DWORD dwErr = GetLastError();
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CloseHandle( _hMap );
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_hMap = 0;
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THROW( CException( HRESULT_FROM_WIN32( dwErr ) ) );
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}
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}
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BOOL OpenForRead( WCHAR const * pwszName )
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{
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Win4Assert( 0 == _hMap );
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Win4Assert( 0 == _pb );
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//
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// Note: you have to ask for PAGE_READWRITE even though we only want
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// PAGE_READ, otherwise you get ERROR_ACCESS_DENIED. I don't know
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// why, but since only a limited # of contexts have write access,
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// it should be OK.
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//
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_hMap = OpenFileMapping( PAGE_READWRITE, // Access
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FALSE, // Inherit
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pwszName ); // Name
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if ( 0 == _hMap )
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{
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if ( ERROR_FILE_NOT_FOUND == GetLastError() )
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return FALSE;
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THROW( CException() );
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}
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_pb = (BYTE *) MapViewOfFile( _hMap,
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FILE_MAP_READ, // Access
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0, // Offset (high)
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0, // Offset (low)
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0 ); // Map all
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if ( 0 == _pb )
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{
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DWORD dwErr = GetLastError();
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CloseHandle( _hMap );
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_hMap = 0;
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THROW( CException( HRESULT_FROM_WIN32( dwErr ) ) );
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}
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return TRUE;
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}
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private:
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HANDLE _hMap;
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BYTE * _pb;
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};
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//+---------------------------------------------------------------------------
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//
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// Member: CNamedSharedMem::CNamedSharedMem, public
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//
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// Synopsis: Create/Open named shared memory
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//
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// Arguments: [pwszName] -- Name of shared memory region
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// [cb] -- Size of shared memory region
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// [psd] -- Security
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// [fWrite] -- TRUE if write-access is required
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//
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// History: 06-Oct-1999 KyleP Heavily modified
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//
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//----------------------------------------------------------------------------
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inline CNamedSharedMem::CNamedSharedMem( WCHAR const * pwszName,
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ULONG cb,
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SECURITY_DESCRIPTOR * psd,
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BOOL fWrite )
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: _hMap( 0 ),
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_pb( 0 )
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{
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//
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// Create null security descriptor, if needed
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//
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struct
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{
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SECURITY_DESCRIPTOR _sdMaxAccess;
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BYTE _sdExtra[SECURITY_DESCRIPTOR_MIN_LENGTH];
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} sd;
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if ( 0 == psd )
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{
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if ( !InitializeSecurityDescriptor( &sd, SECURITY_DESCRIPTOR_REVISION ) )
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{
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THROW( CException() );
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}
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if ( !SetSecurityDescriptorDacl( &sd._sdMaxAccess,// Security descriptor
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TRUE, // Discretionary ACL
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0, // The null ACL (all access)
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FALSE ) ) // Not a default disc. ACL
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{
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THROW( CException() );
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}
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psd = &sd._sdMaxAccess;
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}
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Init( pwszName, cb, psd, fWrite );
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CNamedSharedMem::Init, public
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//
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// Synopsis: Create/Open named shared memory
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//
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// Arguments: [pwszName] -- Name of shared memory region
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// [cb] -- Size of shared memory region
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// [psd] -- Security
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// [fWrite] -- TRUE if write-access is required
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//
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// History: 06-Oct-1999 KyleP Heavily modified
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//
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//----------------------------------------------------------------------------
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void CNamedSharedMem::Init( WCHAR const * pwszName,
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ULONG cb,
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SECURITY_DESCRIPTOR * psd,
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BOOL fWrite )
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{
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Win4Assert( 0 == _hMap );
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Win4Assert( 0 == _pb );
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//Win4Assert( 0 == psd ); // Handy assert to enable to analyze security problems.
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SECURITY_ATTRIBUTES sa = { sizeof(SECURITY_ATTRIBUTES),
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psd,
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FALSE };
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//
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// Set up flags
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//
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DWORD dwCFMMode;
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DWORD dwMVoFMode;
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if ( fWrite )
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{
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dwCFMMode = PAGE_READWRITE;
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dwMVoFMode = FILE_MAP_WRITE;
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}
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else
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{
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dwCFMMode = PAGE_READWRITE; // make it so that others can map for write
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dwMVoFMode = FILE_MAP_READ;
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}
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_hMap = CreateFileMapping( INVALID_HANDLE_VALUE, // Map to page file
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&sa, // Security attributes
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dwCFMMode, // Page-level protection
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0, // Size high
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cb, // size low
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pwszName ); // Name
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#if 0
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if ( 0 != psd )
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{
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BYTE ab[1000];
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DWORD dwl;
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BOOL fOk = GetKernelObjectSecurity( _hMap, // handle to object
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FILE_MAP_WRITEDACL_SECURITY_INFORMATION, // request
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(SECURITY_DESCRIPTOR *)&ab[0], // SD
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sizeof(ab), // size of SD
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&dwl ); // required size of buffer
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Win4Assert( fOk );
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Win4Assert( !fOk );
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ciDebugOut(( DEB_ERROR, "pb = 0x%x\n", &ab[0] ));
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Win4Assert( !fOk );
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//HANDLE hTemp = OpenFileMapping( PAGE_READONLY, // Access
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// FALSE, // Inherit
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// pwszName ); // Name
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HANDLE hTemp = CreateFileMapping( INVALID_HANDLE_VALUE, // Map to page file
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&sa, // Security attributes
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PAGE_READONLY, // Page-level protection
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0, // Size high
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cb, // size low
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pwszName ); // Name
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Win4Assert( 0 != hTemp );
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BYTE * pbTemp = (BYTE *) MapViewOfFile( hTemp, // Handle to map
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FILE_MAP_READ, // Access
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0, // Offset (high)
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0, // Offset (low)
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0 ); // Map all
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Win4Assert( 0 != pbTemp );
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UnmapViewOfFile( pbTemp );
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CloseHandle( hTemp );
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}
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#endif
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if ( 0 != _hMap )
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_pb = (BYTE *) MapViewOfFile( _hMap, // Handle to map
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dwMVoFMode, // Access
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0, // Offset (high)
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0, // Offset (low)
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0 ); // Map all
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}
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