/*++ Copyright (c) 1999-2001 Microsoft Corporation Module Name: mftinfo.cxx Abstract: This module contains the declarations for the NTFS_MFT_INFO class, which stores extracted information from the NTFS MFT. Author: Daniel Chan (danielch) Oct 18, 1999 Environment: ULIB, User Mode --*/ #include #define _NTAPI_ULIB_ #define _UNTFS_MEMBER_ #include "ulib.hxx" #include "error.hxx" #include "untfs.hxx" #include "drive.hxx" #include "attrib.hxx" #include "frs.hxx" #include "upcase.hxx" #include "message.hxx" #include "rtmsg.h" #include "mftinfo.hxx" #include "membmgr2.hxx" //#define RUN_ON_W2K 1 #if defined(RUN_ON_W2K) // // This table is from Windows XP rtl\checksum.c // STATIC ULONG32 RtlCrc32Table [] = { 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d }; // // This routine is from Windows XP rtl\checksum.c // ULONG32 FsRtlComputeCrc32( ULONG32 PartialCrc, PVOID Buf, ULONG Length ) /*++ Routine Description: Compute the CRC32 as specified in in IS0 3309. See RFC-1662 and RFC-1952 for implementation details and references. Pre- and post-conditioning (one's complement) is done by this function, so it should not be done by the caller. That is, do: Crc = RtlComputeCrc32 ( 0, buffer, length ); instead of Crc = RtlComputeCrc32 ( 0xffffffff, buffer, length ); or Crc = RtlComputeCrc32 ( 0xffffffff, buffer, length) ^ 0xffffffff; Arguments: PartialCrc - A partially calculated CRC32. Buffer - The buffer you want to CRC. Length - The length of the buffer in bytes. Return Value: The updated CRC32 value. Environment: Kernel mode at IRQL of APC_LEVEL or below, User mode, or within the boot-loader. --*/ { PUCHAR Buffer = (PUCHAR)Buf; ULONG32 Crc; ULONG i; // // Compute the CRC32 checksum. // Crc = PartialCrc ^ 0xffffffffL; for (i = 0; i < Length; i++) { Crc = RtlCrc32Table [(Crc ^ Buffer [ i ]) & 0xff] ^ (Crc >> 8); } return (Crc ^ 0xffffffffL); } #else #define FsRtlComputeCrc32 RtlComputeCrc32 #endif PNTFS_UPCASE_TABLE NTFS_MFT_INFO::_upcase_table = NULL; UCHAR NTFS_MFT_INFO::_major = 0; UCHAR NTFS_MFT_INFO::_minor = 0; DEFINE_CONSTRUCTOR( NTFS_MFT_INFO, OBJECT ); VOID NTFS_MFT_INFO::Construct( ) /*++ Routine Description: This method is the worker function for object construction. Arguments: N/A Returns: N/A --*/ { _min_file_number = MAXLONGLONG; _max_file_number = -MAXLONGLONG; _major = _minor = 0; _upcase_table = NULL; _max_mem_use = 0; _num_of_files = 0; _mft_info = NULL; } VOID NTFS_MFT_INFO::Destroy( ) /*++ Routine Description: This method cleans up the object in preparation for destruction or reinitialization. Arguments: N/A Returns: N/A --*/ { _min_file_number = MAXLONGLONG; _max_file_number = -MAXLONGLONG; _major = _minor = 0; _upcase_table = NULL; _max_mem_use = 0; _num_of_files = 0; FREE(_mft_info); } NTFS_MFT_INFO::~NTFS_MFT_INFO( ) /*++ Routine Description: This method un-initialize the class object. Arguments: N/A Returns: N/A --*/ { Destroy(); } BOOLEAN NTFS_MFT_INFO::Initialize( IN BIG_INT NumberOfFrs, IN PNTFS_UPCASE_TABLE UpcaseTable, IN UCHAR Major, IN UCHAR Minor, IN ULONG64 MaxMemUse ) /*++ Routine Description: This method initialize this class object. Arguments: FrsInfo -- Supplies the first name to compare. FielName -- Supplies the second name to compare. Returns: TRUE if there is a match; otherwise, FALSE. --*/ { ULONG size; Destroy(); _num_of_files = NumberOfFrs.GetLowPart(); size = NumberOfFrs.GetLowPart()*sizeof(PVOID); _mft_info = (PVOID *)MALLOC(size); if (_mft_info) { if (!_mem_mgr.Initialize(MaxMemUse)) { FREE(_mft_info); return FALSE; } memset(_mft_info, 0, size); _upcase_table = UpcaseTable; _major = Major; _minor = Minor; _max_mem_use = MaxMemUse; return TRUE; } return FALSE; } BOOLEAN NTFS_MFT_INFO::Initialize( ) /*++ Routine Description: This method initialize this class object. Arguments: FrsInfo -- Supplies the first name to compare. FielName -- Supplies the second name to compare. Returns: TRUE if there is a match; otherwise, FALSE. --*/ { if (_mft_info == NULL) return FALSE; // have not been initialize before if (!_mem_mgr.Initialize(_max_mem_use)) { return FALSE; } // prevent accidental use of stale pointers memset(_mft_info, 0, _num_of_files * sizeof(PVOID)); _min_file_number = MAXLONGLONG; _max_file_number = -MAXLONGLONG; return TRUE; } BOOLEAN NTFS_MFT_INFO::CompareFileName( IN PVOID FrsInfo, IN ULONG ValueLength, IN PFILE_NAME FileName, OUT PUSHORT FileNameIndex ) /*++ Routine Description: This method compares the signature computed from FileName against the signature stored in FrsInfo. Arguments: FrsInfo -- Supplies the first name to compare. ValueLength -- Supplies the length of the FileName (second name) value. FileName -- Supplies the second name to compare. FileNameIndex -- Retrieves the index that matches the FileName & ValueLength Returns: TRUE if there is a match; otherwise, FALSE. --*/ { PNTFS_FRS_INFO p = (PNTFS_FRS_INFO)FrsInfo; USHORT i, FileNameCount = p->NumberOfFileNames; FILE_NAME_SIGNATURE signature; NTFS_MFT_INFO::ComputeFileNameSignature(ValueLength, FileName, signature); for (i=0; iFileNameInfo[i].Signature, signature, sizeof(FILE_NAME_SIGNATURE)) == 0) { *FileNameIndex = i; return TRUE; } } return FALSE; } BOOLEAN NTFS_MFT_INFO::ExtractIndexEntryInfo( IN PNTFS_FILE_RECORD_SEGMENT Frs, IN PMESSAGE Message, IN BOOLEAN IgnoreFileName, OUT PBOOLEAN OutOfMemory ) /*++ Routine Description: This method extracts index entry information from the FRS. Arguments: Frs -- Supplies the file record segment to extract information from. Message -- Supplies the outlet for message. Returns: TRUE if successful FALSE if failure --*/ { USHORT number_of_filenames; NTFS_ATTRIBUTE attribute; BOOLEAN error; USHORT i; PNTFS_FRS_INFO p; DUPLICATED_INFORMATION dup_info; PFILE_NAME pFileName; CHAR x[50]; *OutOfMemory = FALSE; number_of_filenames = 0; if (!IgnoreFileName) { for (i=0; Frs->QueryAttributeByOrdinal(&attribute, &error, $FILE_NAME, i); i++) { if (attribute.IsResident()) { number_of_filenames++; } } if (error) { Message->DisplayMsg(MSG_CHK_NO_MEMORY); return FALSE; } } if (number_of_filenames) { p = (PNTFS_FRS_INFO) _mem_mgr.Allocate(sizeof(NTFS_FRS_INFO) + (number_of_filenames-1)*sizeof(_NTFS_FILE_NAME_INFO)); if (p == NULL) { *OutOfMemory = TRUE; return FALSE; } p->SegmentReference = Frs->QuerySegmentReference(); if (!Frs->QueryDuplicatedInformation(&dup_info)) { Message->DisplayMsg(MSG_CHK_NO_MEMORY); return FALSE; } NTFS_MFT_INFO::ComputeDupInfoSignature(&dup_info, p->DupInfoSignature); #if 0 sprintf(x, "DI, %08d, %02x%02x%02x%02x%02x%02x\n", Frs->QueryFileNumber().GetLowPart(), p->DupInfoSignature[0], p->DupInfoSignature[1], p->DupInfoSignature[2], p->DupInfoSignature[3], p->DupInfoSignature[4], p->DupInfoSignature[5]); Message->DisplayMsg(MSG_CHK_NTFS_MESSAGE, "%s%s", x, " "); #endif p->NumberOfFileNames = number_of_filenames; for (i=0; Frs->QueryAttributeByOrdinal(&attribute, &error, $FILE_NAME, i); i++) { if (attribute.IsResident()) { pFileName = (PFILE_NAME)attribute.GetResidentValue(); DebugAssert(pFileName); DebugAssert(number_of_filenames); NTFS_MFT_INFO::ComputeFileNameSignature( attribute.QueryValueLength().GetLowPart(), pFileName, p->FileNameInfo[--number_of_filenames].Signature); p->FileNameInfo[number_of_filenames].Flags = pFileName->Flags; #if 0 sprintf(x, "FN, %08d, %d: %02x%02x%02x%02x%02x%02x%02x\n", Frs->QueryFileNumber().GetLowPart(), number_of_filenames, p->FileNameInfo[number_of_filenames].Signature[0], p->FileNameInfo[number_of_filenames].Signature[1], p->FileNameInfo[number_of_filenames].Signature[2], p->FileNameInfo[number_of_filenames].Signature[3], p->FileNameInfo[number_of_filenames].Signature[4], p->FileNameInfo[number_of_filenames].Signature[5], p->FileNameInfo[number_of_filenames].Signature[6]); Message->DisplayMsg(MSG_CHK_NTFS_MESSAGE, "%s%s", x, " "); #endif } } } else { p = (PNTFS_FRS_INFO)_mem_mgr.Allocate(sizeof(NTFS_FRS_INFO)-sizeof(_NTFS_FILE_NAME_INFO)); if (p == NULL) { *OutOfMemory = TRUE; return FALSE; } p->SegmentReference = Frs->QuerySegmentReference(); p->NumberOfFileNames = 0; } _mft_info[Frs->QueryFileNumber().GetLowPart()] = p; if (_min_file_number > Frs->QueryFileNumber()) _min_file_number = Frs->QueryFileNumber(); if (_max_file_number < Frs->QueryFileNumber()) _max_file_number = Frs->QueryFileNumber(); return TRUE; } VOID NTFS_MFT_INFO::ComputeFileNameSignature( IN ULONG ValueLength, IN PFILE_NAME FileName, OUT FILE_NAME_SIGNATURE Signature ) /*++ Routine Description: This method computes a signature based on the given file name. Arguments: ValueLength -- Supplies the length of the entire FileName value FileName -- Supplies the file name Signature -- Returns the signature of the file name Returns: N/A --*/ { ULONG32 crc; crc = FsRtlComputeCrc32(0, &(FileName->FileNameLength), sizeof(FileName->FileNameLength)); crc = FsRtlComputeCrc32(crc, &(FileName->Flags), sizeof(FileName->Flags)); crc = FsRtlComputeCrc32(crc, &ValueLength, sizeof(ValueLength)); crc = FsRtlComputeCrc32(crc, &(FileName->ParentDirectory), sizeof(FileName->ParentDirectory)); crc = FsRtlComputeCrc32(crc, FileName->FileName, FileName->FileNameLength * sizeof(WCHAR)); memset(Signature, 0, sizeof(FILE_NAME_SIGNATURE)); memcpy(Signature, &crc, min(sizeof(crc), sizeof(FILE_NAME_SIGNATURE))); } VOID NTFS_MFT_INFO::ComputeDupInfoSignature( IN PDUPLICATED_INFORMATION DupInfo, OUT DUP_INFO_SIGNATURE Signature ) /*++ Routine Description: This method computes a signature based on the given duplicated information. Arguments: DupInfo -- Supplies the duplicated information. Signature -- Returns the signature of the duplicated information. Returns: N/A --*/ { ULONG32 crc; ULONG len; // // make sure the first three fields are contiguous // DebugAssert(FIELD_OFFSET(DUPLICATED_INFORMATION, CreationTime) == 0); DebugAssert(FIELD_OFFSET(DUPLICATED_INFORMATION, LastModificationTime) - FIELD_OFFSET(DUPLICATED_INFORMATION, CreationTime) == sizeof(DupInfo->CreationTime)); DebugAssert(FIELD_OFFSET(DUPLICATED_INFORMATION, LastChangeTime) - FIELD_OFFSET(DUPLICATED_INFORMATION, LastModificationTime) == sizeof(DupInfo->LastModificationTime)); DebugAssert(FIELD_OFFSET(DUPLICATED_INFORMATION, LastAccessTime) - FIELD_OFFSET(DUPLICATED_INFORMATION, LastChangeTime) == sizeof(DupInfo->LastChangeTime)); len = FIELD_OFFSET(DUPLICATED_INFORMATION, LastAccessTime); crc = FsRtlComputeCrc32(0, DupInfo, len); // // make sure the fourth field and on are contiguous // DebugAssert(FIELD_OFFSET(DUPLICATED_INFORMATION, FileSize) - FIELD_OFFSET(DUPLICATED_INFORMATION, AllocatedLength) == sizeof(DupInfo->AllocatedLength)); DebugAssert(FIELD_OFFSET(DUPLICATED_INFORMATION, FileAttributes) - FIELD_OFFSET(DUPLICATED_INFORMATION, FileSize) == sizeof(DupInfo->FileSize)); DebugAssert(FIELD_OFFSET(DUPLICATED_INFORMATION, ReparsePointTag) - FIELD_OFFSET(DUPLICATED_INFORMATION, FileAttributes) == sizeof(DupInfo->FileAttributes)); DebugAssert(FIELD_OFFSET(DUPLICATED_INFORMATION, PackedEaSize) - FIELD_OFFSET(DUPLICATED_INFORMATION, FileAttributes) == sizeof(DupInfo->FileAttributes)); DebugAssert(FIELD_OFFSET(DUPLICATED_INFORMATION, Reserved) - FIELD_OFFSET(DUPLICATED_INFORMATION, PackedEaSize) == sizeof(DupInfo->PackedEaSize)); DebugAssert(FIELD_OFFSET(DUPLICATED_INFORMATION, ReparsePointTag) + sizeof(DupInfo->ReparsePointTag) == sizeof(DUPLICATED_INFORMATION)); DebugAssert(FIELD_OFFSET(DUPLICATED_INFORMATION, Reserved) + sizeof(DupInfo->Reserved) == sizeof(DUPLICATED_INFORMATION)); len = FIELD_OFFSET(DUPLICATED_INFORMATION, ReparsePointTag) - FIELD_OFFSET(DUPLICATED_INFORMATION, AllocatedLength); if (_major >= 2 && DupInfo->FileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) { len += sizeof(DupInfo->ReparsePointTag); } else { len += sizeof(DupInfo->PackedEaSize); } crc = FsRtlComputeCrc32(crc, &(DupInfo->AllocatedLength), len); memset(Signature, 0, sizeof(DUP_INFO_SIGNATURE)); memcpy(Signature, &crc, min(sizeof(crc), sizeof(DUP_INFO_SIGNATURE))); } VOID NTFS_MFT_INFO::UpdateRange( IN VCN FileNumber ) /*++ Routine Description: This routine update the range of files that are covered by the object. Arguments: FileNumber - file number to include into the range. Return Value: N/A --*/ { if (_min_file_number > FileNumber) _min_file_number = FileNumber; if (_max_file_number < FileNumber) _max_file_number = FileNumber; }