需要幫助使用NtCreateFile（）打開文件索引

Question

我寫了一個程序，查詢更改日記記錄並列出它們。變化日誌返回：

1）filereferencenumber（fileindex.high和fileindex.low） 2）parentfilereferencenumber（相同的組合如上述，除了它是用於目錄） 3）szReason（原因它出現在變更記錄） 4）文件名和文件長度。

我想找到更改日誌中列出的此文件的路徑。我見過的大多數實現都跟蹤了所有的filereferencenumber並查詢它進行比較，或者他們使用FindNextFile（）函數遍歷整個卷。

我遇到了一個討論，他們說，他們可以使用filereferencenumber打開一個文件句柄。 http://www.tech-archive.net/Archive/Windows/microsoft.public.windows.file_system/2004-11/0244.html

MSDN文章說，我們需要加載一個庫之前調用內部API的http://msdn.microsoft.com/en-us/library/bb432380%28v=vs.85%29.aspx

有人點我在正確的方向，告訴我該怎麼做？我如何使用NtCreateFile（）？

或者，有沒有辦法使用filereferencenumber訪問文件路徑？

Answer 1

這裏是我使用的代碼： http://www.ragestorm.net/blogs/?cat=7

#include windows.h 
typedef ULONG (__stdcall *pNtCreateFile)(
    PHANDLE FileHandle, 
    ULONG DesiredAccess, 
    PVOID ObjectAttributes, 
    PVOID IoStatusBlock, 
    PLARGE_INTEGER AllocationSize, 
    ULONG FileAttributes, 
    ULONG ShareAccess, 
    ULONG CreateDisposition, 
    ULONG CreateOptions, 
    PVOID EaBuffer, 
    ULONG EaLength 
); 

typedef ULONG (__stdcall *pNtReadFile)(
    IN HANDLE FileHandle, 
    IN HANDLE Event OPTIONAL, 
    IN PVOID ApcRoutine OPTIONAL, 
    IN PVOID ApcContext OPTIONAL, 
    OUT PVOID IoStatusBlock, 
    OUT PVOID Buffer, 
    IN ULONG Length, 
    IN PLARGE_INTEGER ByteOffset OPTIONAL, 
    IN PULONG Key OPTIONAL ); 

typedef struct _UNICODE_STRING { 
    USHORT Length, MaximumLength; 
    PWCH Buffer; 
} UNICODE_STRING, *PUNICODE_STRING; 

typedef struct _OBJECT_ATTRIBUTES { 
ULONG Length; 
HANDLE RootDirectory; 
PUNICODE_STRING ObjectName; 
ULONG Attributes; 
PVOID SecurityDescriptor;  // Points to type SECURITY_DESCRIPTOR 
PVOID SecurityQualityOfService; // Points to type SECURITY_QUALITY_OF_SERVICE 
} OBJECT_ATTRIBUTES; 

#define InitializeObjectAttributes(p, n, a, r, s) { \ 
(p)->Length = sizeof(OBJECT_ATTRIBUTES);   \ 
(p)->RootDirectory = r;        \ 
(p)->Attributes = a;        \ 
(p)->ObjectName = n;        \ 
(p)->SecurityDescriptor = s;      \ 
(p)->SecurityQualityOfService = NULL;    \ 
} 

#define OBJ_CASE_INSENSITIVE 0x00000040L 
#define FILE_NON_DIRECTORY_FILE 0×00000040 
#define FILE_OPEN_BY_FILE_ID 0×00002000 
#define FILE_OPEN 0×00000001 

int main(int argc, char* argv[]) 
{ 
    HANDLE d = CreateFile(L"\\\\.\\c:", GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, 0, OPEN_EXISTING, 0, 0 ); 
    BY_HANDLE_FILE_INFORMATION i; 
    HANDLE f = CreateFile(L"c:\\bla.bla", GENERIC_WRITE, 0, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); 
    ULONG bla; 
    WriteFile(f, "helloworld", 11, &bla, NULL); 
    printf("%x, %d\n", f, GetLastError()); 
    GetFileInformationByHandle(f, &i); 
    printf("id:%08x-%08x\n", i.nFileIndexHigh, i.nFileIndexLow); 
    CloseHandle(f); 

    pNtCreateFile NtCreatefile = (pNtCreateFile)GetProcAddress(GetModuleHandle(L"ntdll.dll"), "NtCreateFile"); 
    pNtReadFile NtReadFile = (pNtReadFile)GetProcAddress(GetModuleHandle(L"ntdll.dll"), "NtReadFile"); 

    ULONG fid[2] = {i.nFileIndexLow, i.nFileIndexHigh}; 
    UNICODE_STRING fidstr = {8, 8, (PWSTR) fid}; 

    OBJECT_ATTRIBUTES oa = {0}; 
    InitializeObjectAttributes (&oa, &fidstr, OBJ_CASE_INSENSITIVE, d, NULL); 

    ULONG iosb[2]; 
    ULONG status = NtCreatefile(&f, GENERIC_ALL, &oa, iosb, NULL, FILE_ATTRIBUTE_NORMAL, FILE_SHARE_READ | FILE_SHARE_WRITE, FILE_OPEN, FILE_OPEN_BY_FILE_ID | FILE_NON_DIRECTORY_FILE, NULL, 0); 
    printf("status: %X, handle: %x\n", status, f); 
    UCHAR buf[11] = {0}; 
    LONG Off[2] = {0}; 
    status = NtReadFile(f, NULL, NULL, NULL, (PVOID)&iosb, (PVOID)buf, sizeof(buf), (PLARGE_INTEGER)&Off, NULL); 
    printf("status: %X, bytes: %d\n", status, iosb[1]); 
    printf("buf: %s\n", buf); 
    CloseHandle(f); 
    CloseHandle(d); 
} 

正如你所看到的，一旦你給fileindex.high和fileindex.low的filereferencenumber的一部分，它給你的句柄文件。我使用psapi的getFileMapping函數來獲取完整路徑。那些好奇的信息：http://msdn.microsoft.com/en-us/library/aa366789.aspx