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/*
* Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
* This file is part of the "Windows 7 drivers" project.
* For details, see https://github.com/egor-tensin/windows7-drivers.
* Distributed under the MIT License.
*/
#include <ntifs.h>
#include "nt2dos.h"
static NTSTATUS get_object_name_info(
void *object,
OBJECT_NAME_INFORMATION **object_name_info)
{
unsigned long nbneeded;
NTSTATUS status = STATUS_SUCCESS;
status = ObQueryNameString(object, NULL, 0, &nbneeded);
if (status != STATUS_INFO_LENGTH_MISMATCH)
return status;
*object_name_info = ExAllocatePoolWithTag(PagedPool, nbneeded, '1l');
if (*object_name_info == NULL)
return STATUS_INSUFFICIENT_RESOURCES;
status = ObQueryNameString(object, *object_name_info, nbneeded, &nbneeded);
if (!NT_SUCCESS(status))
goto free_object_name_info;
return status;
free_object_name_info:
ExFreePool(*object_name_info);
return status;
}
NTSTATUS nt2dos(UNICODE_STRING *u_resolved, UNICODE_STRING *u_unresolved)
{
IO_STATUS_BLOCK io_status_block;
DEVICE_OBJECT *volume_object;
FILE_OBJECT *file_object;
HANDLE file;
OBJECT_ATTRIBUTES file_attrs;
OBJECT_NAME_INFORMATION *file_name_info, *volume_name_info;
UNICODE_STRING u_dos_name;
USHORT u_resolved_size;
NTSTATUS status = STATUS_SUCCESS;
InitializeObjectAttributes(
&file_attrs,
u_unresolved,
OBJ_CASE_INSENSITIVE | OBJ_OPENIF,
NULL,
NULL);
status = ZwCreateFile(
&file,
FILE_READ_ATTRIBUTES,
&file_attrs,
&io_status_block,
NULL,
FILE_ATTRIBUTE_NORMAL,
FILE_SHARE_READ | FILE_SHARE_WRITE,
FILE_OPEN,
FILE_SYNCHRONOUS_IO_NONALERT,
NULL,
0);
if (!NT_SUCCESS(status))
return status;
status = ObReferenceObjectByHandle(
file,
FILE_READ_ATTRIBUTES,
*IoFileObjectType,
KernelMode,
&file_object,
NULL);
if (!NT_SUCCESS(status))
goto close_file;
status = get_object_name_info(file_object, &file_name_info);
if (!NT_SUCCESS(status))
goto close_file;
if (file_object->Vpb == NULL)
{
u_resolved->Buffer = ExAllocatePoolWithTag(
PagedPool, file_name_info->Name.Length, '1l');
if (u_resolved->Buffer == NULL)
{
status = STATUS_INSUFFICIENT_RESOURCES;
goto free_file_name_info;
}
RtlInitEmptyUnicodeString(
u_resolved, u_resolved->Buffer, file_name_info->Name.Length);
RtlCopyUnicodeString(u_resolved, &file_name_info->Name);
goto free_file_name_info;
}
volume_object = file_object->Vpb->RealDevice;
status = get_object_name_info(volume_object, &volume_name_info);
if (!NT_SUCCESS(status))
goto free_file_name_info;
status = IoVolumeDeviceToDosName(volume_object, &u_dos_name);
if (!NT_SUCCESS(status))
goto free_volume_name_info;
u_resolved_size = file_name_info->Name.Length - volume_name_info->Name.Length + u_dos_name.Length;
u_resolved->Buffer = ExAllocatePoolWithTag(PagedPool, u_resolved_size, '1l');
if (u_resolved->Buffer == NULL)
{
status = STATUS_INSUFFICIENT_RESOURCES;
goto free_dos_name;
}
RtlInitEmptyUnicodeString(u_resolved, u_resolved->Buffer, u_resolved_size);
RtlCopyUnicodeString(u_resolved, &u_dos_name);
file_name_info->Name.Buffer += volume_name_info->Name.Length / sizeof(wchar_t);
file_name_info->Name.Length -= volume_name_info->Name.Length;
RtlUnicodeStringCat(u_resolved, &file_name_info->Name);
free_dos_name:
ExFreePool(u_dos_name.Buffer);
free_volume_name_info:
ExFreePool(volume_name_info);
free_file_name_info:
ExFreePool(file_name_info);
close_file:
ZwClose(file);
return status;
}
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