#include <Windows.h>
#include <winioctl.h>
#include <cstdio>

typedef struct _MOUNTMGR_MOUNT_POINT {
  ULONG  SymbolicLinkNameOffset;
  USHORT SymbolicLinkNameLength;
  ULONG  UniqueIdOffset;
  USHORT UniqueIdLength;
  ULONG  DeviceNameOffset;
  USHORT DeviceNameLength;
} MOUNTMGR_MOUNT_POINT, *PMOUNTMGR_MOUNT_POINT;

typedef struct _MOUNTMGR_MOUNT_POINTS {
  ULONG                Size;
  ULONG                NumberOfMountPoints;
  MOUNTMGR_MOUNT_POINT MountPoints[1];
} MOUNTMGR_MOUNT_POINTS, *PMOUNTMGR_MOUNT_POINTS;

VOID PrintHex(PBYTE Data, ULONG dwBytes) {
  for (ULONG i = 0; i < dwBytes; i += 16) {
    printf("%.8x: ", i);

    for (ULONG j = 0; j < 16; j++) {
      if (i + j < dwBytes) {
        printf("%.2x ", Data[i + j]);
      }
      else {
        printf("?? ");
      }
    }

    for (ULONG j = 0; j < 16; j++) {
      if (i + j < dwBytes && Data[i + j] >= 0x20 && Data[i + j] <= 0x7e) {
        printf("%c", Data[i + j]);
      }
      else {
        printf(".");
      }
    }

    printf("\n");
  }
}

int main() {
  // Open mount point manager.
  HANDLE hMntPointMgr = CreateFile(L"\\\\.\\MountPointManager",
                                   0,
                                   FILE_SHARE_READ | FILE_SHARE_WRITE,
                                   NULL,
                                   OPEN_EXISTING,
                                   FILE_ATTRIBUTE_NORMAL,
                                   NULL);
  if (hMntPointMgr == INVALID_HANDLE_VALUE) {
    printf("CreateFile failed, %d\n", GetLastError());
    return 1;
  }

  // Request data, assuming it fits into the 4096-byte buffer.
  MOUNTMGR_MOUNT_POINT mnt_point;
  RtlZeroMemory(&mnt_point, sizeof(mnt_point));

  BYTE OutputBuffer[4096];
  DWORD BytesReturned;
  if (!DeviceIoControl(hMntPointMgr, 0x6D0008, &mnt_point, sizeof(mnt_point), OutputBuffer, sizeof(OutputBuffer), &BytesReturned, NULL)) {
    printf("DeviceIoControl failed, %d\n", GetLastError());
    CloseHandle(hMntPointMgr);
    return 1;
  }

  PrintHex(OutputBuffer, BytesReturned);

  CloseHandle(hMntPointMgr);

  return 0;
}