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VeeamonBasic.cpp
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VeeamonBasic.cpp
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#define _CRT_SECURE_NO_WARNINGS
#include <Windows.h>
#include <psapi.h>
#include <stdio.h>
enum NameEntryType
{
ProcessEntry,
MonitoredEntry,
FileEntry
};
enum RequestFlags : BYTE
{
RF_CallPreHandler = 0x1,
RF_CallPostHandler = 0x2,
RF_PassDown = 0x10,
RF_Wait = 0x20,
RF_DenyAccess = 0x40,
RF_CompleteRequest = 0x80,
};
struct CtrlBlock
{
BYTE ProcessIndex;
BYTE FolderIndex;
WORD FileIndex : 10;
WORD MajorFunction : 6;
};
struct SharedBufferEntry
{
//header
DWORD Flags;
union
{
CtrlBlock Ctrl;
DWORD d1;
};
//body
DWORD d2;
DWORD d3;
DWORD d4;
DWORD d5;
DWORD d6;
DWORD d7;
};
struct SharedBufferDescriptor
{
DWORD FolderIndex;
DWORD SharedBufferLength;
DWORD SharedBufferPtr;
DWORD Unk;
};
SharedBufferDescriptor SharedBufDesc;
#define IOCTL_START_FOLDER_MONITORING CTL_CODE(FILE_DEVICE_UNKNOWN, 0x900, METHOD_BUFFERED, FILE_ANY_ACCESS) //0x222400
#define IOCTL_STOP_FOLDER_MONITORING CTL_CODE(FILE_DEVICE_UNKNOWN, 0x901, METHOD_BUFFERED, FILE_ANY_ACCESS) //0x222404
#define IOCTL_UNWAIT_REQUEST CTL_CODE(FILE_DEVICE_UNKNOWN, 0x920, METHOD_BUFFERED, FILE_ANY_ACCESS) //0x222480
#define IOCTL_SET_STREAM_FLAGS CTL_CODE(FILE_DEVICE_UNKNOWN, 0x910, METHOD_BUFFERED, FILE_ANY_ACCESS) //0x222440
BOOL CtlDestroyFolder(HANDLE hDevice, DWORD FolderIndex)
{
DWORD BytesReturned;
BOOL r = DeviceIoControl(hDevice, IOCTL_STOP_FOLDER_MONITORING, &FolderIndex, sizeof(FolderIndex), 0, 0, &BytesReturned, 0);
if (r == FALSE)
{
printf("DestroyFolder failed\n");
}
return r;
}
BOOL CtlCreateMonitoredFolder(
HANDLE hDevice,
PCWCHAR FolderPathName,
PHANDLE SharedBufSemaphore,
PHANDLE NewEntrySemaphore
)
{
DWORD BytesReturned;
struct MonitoredFolder
{
HANDLE SharedBufSemaphore;
DWORD d1;
HANDLE NewEntrySemaphore;
DWORD d2;
DWORD f1; //+0x10
DWORD SharedBufferEntriesCount; //+0x14
DWORD PathLength; //+0x18
WCHAR PathName[0x80]; //+0x1C
};
MonitoredFolder Folder = { };
//const wchar_t *pFolderPath = L"\\Device\\HardDiskVolume1\\TMP\\";
*SharedBufSemaphore = *NewEntrySemaphore = nullptr;
// Add protected folder
Folder.SharedBufSemaphore = CreateSemaphoreW(nullptr, 0, 10000, nullptr);
Folder.NewEntrySemaphore = CreateSemaphoreW(nullptr, 1, 10000, nullptr);
Folder.f1 = 0x20;
Folder.SharedBufferEntriesCount = 0x200;
Folder.PathLength = wcslen(FolderPathName) * sizeof(FolderPathName[0]);
wcscpy(Folder.PathName, FolderPathName);
BOOL r = DeviceIoControl(hDevice, IOCTL_START_FOLDER_MONITORING, &Folder, sizeof(Folder), &SharedBufDesc, sizeof(SharedBufDesc), &BytesReturned, 0);
if (r == FALSE)
{
printf("CreateFolder failed\n");
}
else
{
*SharedBufSemaphore = Folder.SharedBufSemaphore;
*NewEntrySemaphore = Folder.NewEntrySemaphore;
if (BytesReturned != sizeof(SharedBufDesc))
{
printf("Bad sizeof shared buffer\n");
r = FALSE;
}
}
return r;
}
BOOL CtlUnwaitRequest(
HANDLE hDevice,
CtrlBlock* Ctrl,
WORD SharedBufferEntryIndex,
RequestFlags RFlags
)
{
struct UnwaitDescriptor
{
CtrlBlock Ctrl;
DWORD SharedBufferEntryIndex;
RequestFlags RFlags;
BYTE IsStatusPresent;
BYTE IsUserModeBuffPresent;
BYTE SetSomeFlag;
DWORD Status;
DWORD Information;
PVOID UserBuff;
DWORD d6;
DWORD UserBuffLength;
};
DWORD BytesReturned;
UnwaitDescriptor Unwait = { 0, };
Unwait.Ctrl.FolderIndex = Ctrl->FolderIndex;
Unwait.Ctrl.MajorFunction = Ctrl->MajorFunction;
Unwait.Ctrl.FileIndex = Ctrl->FileIndex;
Unwait.SharedBufferEntryIndex = SharedBufferEntryIndex;
Unwait.RFlags = RFlags;
Unwait.IsUserModeBuffPresent = 0;
// Uncomment the code below to crash the OS.
// VeeamFSR doesn't handle this parameter correctly. Setting IsUserModeBuffPresent to true
// leads to double free in the completion rountine.
//Unwait.UserBuff = (PVOID)"aaaabbbb";
//Unwait.UserBuffLength = 8;
//Unwait.IsUserModeBuffPresent = 1;
BOOL r = DeviceIoControl(hDevice, IOCTL_UNWAIT_REQUEST, &Unwait, sizeof(Unwait), 0, 0, &BytesReturned, 0);
if (r == FALSE)
{
printf("UnwaitRequest failed\n");
}
return r;
}
BOOL CtlUnwaitRequest(
HANDLE hDevice,
CtrlBlock* Ctrl,
WORD SharedAreaEntryIndex
)
{
return CtlUnwaitRequest(hDevice, Ctrl, SharedAreaEntryIndex, RF_PassDown);
}
DWORD GetProcessImageFileNameByPid(DWORD Pid, PWCHAR pBuf, DWORD Length)
{
DWORD r = 0;
HANDLE hProcess = OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, FALSE, Pid);
if (hProcess == NULL)
{
printf("OpenProcess failed with %d for pid %d\n", GetLastError(), Pid);
}
else
{
r = GetProcessImageFileNameW(hProcess, pBuf, Length);
if (r == 0)
{
printf("GetProcessImageFileNameW failed: %d\n", GetLastError());
}
CloseHandle(hProcess);
}
return r;
}
DWORD FileMapping[0x80];
DWORD ProcessMapping[0x80];
VOID PrintEntryInfo(const CHAR* pOpName, SharedBufferEntry IOEntryBuffer[], SharedBufferEntry* pEntry)
{
WCHAR ProcessName[MAX_PATH];
DWORD ProcessIndex = ProcessMapping[pEntry->Ctrl.ProcessIndex];
DWORD Pid = IOEntryBuffer[ProcessIndex].d6;
DWORD ProcessNameLength = GetProcessImageFileNameByPid(Pid, ProcessName, MAX_PATH);
DWORD NameIndex = FileMapping[pEntry->Ctrl.FileIndex];
printf("%s for %ls by process %d (%ls)\n", pOpName, (PWSTR)IOEntryBuffer[NameIndex].d6, Pid, ProcessNameLength == 0 ? L"null" : ProcessName);
}
VOID PrintBuffer(PBYTE pBuffer, DWORD Length)
{
for (int i = 0; i < 17; i++)
{
if ((i & 7) == 0)
{
printf("\n");
}
if (IsCharAlphaNumericA(pBuffer[i]) == TRUE)
{
printf(" %c ", pBuffer[i]);
}
else
{
printf("%02x ", pBuffer[i]);
}
}
printf("\n");
}
int wmain(int arc, wchar_t** argv)
{
if (arc != 2)
{
printf("Usage: veeamon NativePathToFolder\n");
return -1;
}
HANDLE hDevice = CreateFileW(L"\\\\.\\VeeamFSR", GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, 0, OPEN_EXISTING, 0, 0);
if (hDevice == INVALID_HANDLE_VALUE)
{
printf("CreateFileW: %d\n", GetLastError());
return -1;
}
HANDLE SharedBufSemaphore;
HANDLE NewEntrySemaphore;
WORD CurrEntry = 0;
PCWCHAR Folder = argv[1];
if (CtlCreateMonitoredFolder(
hDevice,
Folder,
&SharedBufSemaphore,
&NewEntrySemaphore) == FALSE)
{
printf("Failed setting up monitored folder\n");
return -1;
}
printf("Set up monitor on %ls\n", Folder);
printf("FolderIndex: 0x%x\n", SharedBufDesc.FolderIndex);
printf("Shared buffer: %p\n", (PVOID)SharedBufDesc.SharedBufferPtr);
printf("Shared buffer length: 0x%x\n", SharedBufDesc.SharedBufferLength);
printf("Uknown: 0x%x\n", SharedBufDesc.Unk);
printf("\nStarting IO loop\n");
SharedBufferEntry* IOEntryBuffer = (SharedBufferEntry*)SharedBufDesc.SharedBufferPtr;
SharedBufferEntry* IOEntry;
for (;;)
{
LONG l;
ReleaseSemaphore(NewEntrySemaphore, 1, &l);
WaitForSingleObject(SharedBufSemaphore, INFINITE);
printf("Entry #%d\n", CurrEntry);
IOEntry = &IOEntryBuffer[CurrEntry];
switch (IOEntry->Ctrl.MajorFunction)
{
//
// IRP_MJ_XXX and FastIo handlers
//
case 0x0: //IRP_MJ_CREATE
case 0x33: //Fast _IRP_MJ_CREATE
{
PrintEntryInfo("IRP_MJ_CREATE", IOEntryBuffer, IOEntry);
CtlUnwaitRequest(hDevice, &IOEntry->Ctrl, CurrEntry, RF_PassDown);
break;
}
default:
{
CHAR OpName[40]{};
sprintf_s(OpName, 40, "IRP_MJ_%d", IOEntry->Ctrl.MajorFunction);
PrintEntryInfo(OpName, IOEntryBuffer, &IOEntryBuffer[CurrEntry]);
break;
}
//
// Special entry handlers
//
case 0x37: //Name entry
{
printf("\tADD\n");
switch (IOEntry->d2)
{
case ProcessEntry:
printf("\tprocess: %d\n", IOEntry->d6);
ProcessMapping[IOEntry->d3] = CurrEntry;
break;
case FileEntry:
//.d4 == length
printf("\tfile: %ls\n", (PWSTR)IOEntry->d6);
FileMapping[IOEntry->d3] = CurrEntry;
break;
case MonitoredEntry:
//.d4 == length
printf("\tmonitored dir: %ls\n", (PWSTR)IOEntry->d6);
break;
}
break;
}
case 0x38:
{
printf("\tDELETION\n");
switch (IOEntry->d2)
{
case ProcessEntry:
printf("\tprocess\n");
break;
case FileEntry:
printf("\tfile\n");
break;
case MonitoredEntry:
printf("\tmonitored dir\n");
break;
}
printf("\tindex: %d\n", IOEntry->d2);
break;
}
case 0x39:
{
printf("\tCOMPLETION of IRP_MJ_%d, index = %d, status = 0x%x, information: 0x%x\n",
IOEntry->d2,
IOEntry->d3,
IOEntry->d4,
IOEntry->d5);
break;
}
case 0x3A:
{
printf("\tWRITE-related entry\n");
break;
}
}
printf("\t0x%.8x 0x%.8x 0x%.8x 0x%.8x\n", IOEntry->Flags, IOEntry->d1, IOEntry->d2, IOEntry->d3);
printf("\t0x%.8x 0x%.8x 0x%.8x 0x%.8x\n", IOEntry->d4, IOEntry->d5, IOEntry->d6, IOEntry->d7);
CurrEntry++;
if (CurrEntry >= 0x200)
{
break;
}
}
CtlDestroyFolder(hDevice, 0);
CloseHandle(hDevice);
printf("Press any key...\n");
getchar();
return 0;
}