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Diffstat (limited to 'src/classlibnative/nls/nlstable.cpp')
| -rw-r--r-- | src/classlibnative/nls/nlstable.cpp | 259 |
1 files changed, 0 insertions, 259 deletions
diff --git a/src/classlibnative/nls/nlstable.cpp b/src/classlibnative/nls/nlstable.cpp deleted file mode 100644 index dd395153d4..0000000000 --- a/src/classlibnative/nls/nlstable.cpp +++ /dev/null @@ -1,259 +0,0 @@ -// Licensed to the .NET Foundation under one or more agreements. -// The .NET Foundation licenses this file to you under the MIT license. -// See the LICENSE file in the project root for more information. - -#include "common.h" -#include <winwrap.h> -#include <excep.h> // For COMPlusThrow -#include <appdomain.hpp> -#include <assembly.hpp> -#include "nlstable.h" // Class declaration - -#if FEATURE_CODEPAGES_FILE - -/*=================================CreateSharedMemoryMapping================================== -**Action: Create a file mapping object which can be shared among different users under Windows NT/2000. -** Actually its just a memory mapped section of the swapfile. -**Returns: The file mapping handle. NULL if any error happens. -**Arguments: -** pMappingName the name of the file mapping object. -** iSize Size to use -**Exceptions: -**Note: -** This function creates a DACL which grants GENERIC_ALL access to members of the "Everyone" group. -** Then create a security descriptor using this DACL. Finally, use this SA to create the file mapping object. -** WARNING: -** This creates a shared file or shared paged memory section (if hFile == INVALID_HANDLE_VALUE) that is shared machine-wide -** Therefore for side-by-side to work, the mapping names must be unique per version! -** We utilize this feature for code pages in case it hasn't changed across versions we can still reuse the -** tables, but it seems suspicious for other applications (as commented in MapDataFile below) -==============================================================================*/ -// static method -HANDLE NLSTable::CreateSharedMemoryMapping(const LPCWSTR pMappingName, const int iSize ) { - CONTRACTL { - THROWS; - GC_NOTRIGGER; - MODE_ANY; - PRECONDITION(iSize > 0); - PRECONDITION(CheckPointer(pMappingName)); - } CONTRACTL_END; - - HANDLE hFileMap = NULL; - - SECURITY_DESCRIPTOR sd ; - SECURITY_ATTRIBUTES sa ; - - // - // Create the sid for the Everyone group. - // - SID_IDENTIFIER_AUTHORITY siaWorld = SECURITY_WORLD_SID_AUTHORITY; - PSID pSID = NULL; - int nSidSize; - - PACL pDACL = NULL; - int nAclSize; - - CQuickBytes newBuffer; - - if (!AllocateAndInitializeSid(&siaWorld, 1, SECURITY_WORLD_RID, 0, 0, 0, 0, 0, 0, 0, &pSID)) { - goto ErrorExit; - } - - nSidSize = GetLengthSid(pSID); - - // - // Create Discretionary Access Control List (DACL). - // - - // First calculate the size of the DACL, since this is a linked-list like structure which contains one or more - // ACE (access control entry) - nAclSize = sizeof(ACL) // the header structure of ACL - + sizeof(ACCESS_ALLOWED_ACE) + nSidSize; // and one "access allowed ACE". - - // We know the size needed for DACL now, so create it. - // An exception is thrown if OOM happens. - pDACL = (PACL) (newBuffer.AllocThrows(nAclSize)); - if(!InitializeAcl( pDACL, nAclSize, ACL_REVISION )) - goto ErrorExit; - - // Add the "access allowed ACE", meaning: - // we will allow members of the "Everyone" group to have SECTION_MAP_READ | SECTION_QUERY access to the file mapping object. - // for memory sections the creator will still be allowed to create it. - if(!AddAccessAllowedAce( pDACL, ACL_REVISION, SECTION_MAP_READ | SECTION_QUERY, pSID )) - goto ErrorExit; - - // - // Create Security descriptor (SD). - // - if(!InitializeSecurityDescriptor( &sd, SECURITY_DESCRIPTOR_REVISION )) - goto ErrorExit; - // Set the previously created DACL to this SD. - if(!SetSecurityDescriptorDacl( &sd, TRUE, pDACL, FALSE )) - goto ErrorExit; - - // Create Security Attribute (SA). - sa.nLength = sizeof( sa ) ; - sa.bInheritHandle = TRUE ; - sa.lpSecurityDescriptor = &sd ; - - // - // Finally, create the file mapping using the SA. - // - - // If we are on Windows 2000 or later, try to open it in global namespace. The \global namespace is ignored if - // Terminal service is not running. - WCHAR globalSectionName[MAX_LONGPATH]; - wcscpy_s(globalSectionName, COUNTOF(globalSectionName), W("Global\\")); - if (wcslen(pMappingName) + wcslen(globalSectionName) >= MAX_LONGPATH) { - goto ErrorExit; - } - wcscat_s(globalSectionName, COUNTOF(globalSectionName), pMappingName); - - // Try to create the section in the Global\ namespace. The CreateFileMapping() will ignore Global\ namespace if Terminal Service - // is not running. - hFileMap = WszCreateFileMapping(INVALID_HANDLE_VALUE, &sa, PAGE_READWRITE, 0, iSize, globalSectionName); - - // If not allowed to be global (like terminal server) or not WinNT, then open it in local namespace. - if (hFileMap == NULL) - { - // Not WinNT or access denied for Global\ namespace, try the local namespace. When Terminal service is running, the Local\ namespace - // means the namespace "Sessions\<n>\BasedNamedObjects". - hFileMap = WszCreateFileMapping(INVALID_HANDLE_VALUE, &sa, PAGE_READWRITE, 0, iSize, pMappingName); - } - -ErrorExit: - if(pSID) - FreeSid( pSID ); - - // If still not allowed, try building one with no name - if (hFileMap == NULL) - { - hFileMap = WszCreateFileMapping( - INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, iSize, NULL); - } - - return (hFileMap) ; -} - -/*=================================OpenOrCreateMemoryMapping================================== -**Action: Opens an existing memory mapped object, or creates a new one (by calling above fn). -** Worst case just allocate some memory. -**Returns: The pointer to our memory. NULL if any error happens. -**Arguments: -** pMappingName the name of the file mapping object. -** iSize Size to use -**Exceptions: -** -**IMPORTANT: -** Memory mapped sections are cleared when set. We expect the caller to set the last int -** to a non-zero value, so we test this flag. If it is still zero when we open it, we -** assume that we've gotten a result in an unfinished state and allocate a new one instead -** of trying to use the one with the zeros. -** -**Note: -** This function creates a DACL which grants GENERIC_ALL access to members of the "Everyone" group. -** Then create a security descriptor using this DACL. Finally, use this SA to create the file mapping object. -** WARNING: -** This creates a shared file or shared paged memory section (if hFile == INVALID_HANDLE_VALUE) that is shared machine-wide -** Therefore for side-by-side to work, the mapping names must be unique per version! -** We utilize this feature for code pages in case it hasn't changed across versions we can still reuse the -** tables, but it seems suspicious for other applications (as commented in MapDataFile below) -==============================================================================*/ -PBYTE NLSTable::OpenOrCreateMemoryMapping(const LPCWSTR pMappingName, const int iSize, HANDLE* mappedFile) -{ - CONTRACTL - { - THROWS; - DISABLED(GC_TRIGGERS); // - MODE_ANY; - PRECONDITION(iSize % 4 == 0); - PRECONDITION(iSize > 0); - PRECONDITION(CheckPointer(pMappingName)); - PRECONDITION(CheckPointer(mappedFile)); - } CONTRACTL_END; - - _ASSERTE(pMappingName != NULL); // Must have a string name. - _ASSERTE(iSize > 0); // Pointless to have <= 0 allocation - _ASSERTE(iSize % 4 == 0); // Need 4 byte alignment for flag check - - LPVOID pResult = NULL; - - // Try creating/opening it. - HANDLE hMap = NULL; - - *mappedFile = hMap; - // Calls into OS a lot, should switch to preemp mode - GCX_PREEMP(); - - // First try opening it. It might already be in existence - // The assumption here is that it's rare that we will hit the cases where two or more threads are trying to create - // the named section at the same time. Therefore, the following code does not use critical section or mutex trying - // to synchornize different threads. - - // Try to open it in global namespace. The global\ namespace is ignored if terminal service is not running. - WCHAR globalSectionName[MAX_LONGPATH]; - wcscpy_s(globalSectionName, COUNTOF(globalSectionName), W("Global\\")); - if (wcslen(pMappingName) + wcslen(globalSectionName) >= MAX_LONGPATH) - return NULL; - - wcscat_s(globalSectionName, COUNTOF(globalSectionName), pMappingName); - - hMap = WszOpenFileMapping(FILE_MAP_READ, TRUE, globalSectionName); - if (hMap == NULL) { - // If access is denied for global\namespace or the name is not opened in global namespace, try the local namespace. - // Also if we're rotor or win 9x. - hMap = WszOpenFileMapping(FILE_MAP_READ, TRUE, pMappingName); - } - - if (hMap != NULL) { - // We got a section, map a view, READ ONLY! - pResult = MapViewOfFile( hMap, FILE_MAP_READ, 0, 0, 0); - - // Anything found? - if (pResult != NULL) - { - // Make sure our result is allocated. We expect a non-0 flag to be set for last int of our section - const int* pFlag = (int*)(((BYTE*)pResult) + iSize - 4); - if (*pFlag != 0) - { - *mappedFile = hMap; - // Found a valid already opened section! - return (PBYTE)pResult; - } - - // Couldn't find it, unmap it. - UnmapViewOfFile(pResult); - pResult = NULL; - } - - // We can't use this one, so close it - CloseHandle(hMap); - hMap = NULL; - } - - // Didn't get a section, try to create one, NT/XP/.Net gets security permissions, 9X doesn't, - // but our helper fn takes care of that for us. - hMap = NLSTable::CreateSharedMemoryMapping(pMappingName, iSize); - - // Were we successfull? - if (hMap != NULL) - { - // We have hMap, try to get our section - pResult = MapViewOfFile( hMap, FILE_MAP_ALL_ACCESS, 0, 0, 0); - - // Don't close hMap unless we aren't using it. - // That confuses the mapping stuff and we lose the name, it'll close when runtime shuts down. - if (pResult == NULL) - { - CloseHandle(hMap); - hMap = NULL; - } - // There is no need to zero out the mapCodePageCached field, since the initial contents of the pages in the file mapping object are zero. - - *mappedFile = hMap; - } - - return (PBYTE)pResult; -} - -#endif |