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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 "control_codes.h"
#include "device.h"
#include "nt2dos.h"
#include <ntddk.h>
static NTSTATUS device_open(DEVICE_OBJECT *device_object, IRP *irp)
{
NTSTATUS status = STATUS_SUCCESS;
UNREFERENCED_PARAMETER(device_object);
irp->IoStatus.Status = status;
irp->IoStatus.Information = 0;
IoCompleteRequest(irp, IO_NO_INCREMENT);
return status;
}
typedef NTSTATUS (*ioctl_handler)(
void *, unsigned long,
void *, unsigned long,
ULONG_PTR *);
static NTSTATUS handle_convert_nt_path(
void *in_buf,
unsigned long in_buf_size,
void *out_buf,
unsigned long out_buf_size,
ULONG_PTR *nbwritten)
{
UNICODE_STRING uUnresolved, uResolved;
NTSTATUS status = STATUS_SUCCESS;
DbgPrint("nt_path_converter: unresolved path: %ws\n", (WCHAR *) in_buf);
DbgPrint("nt_path_converter: unresolved size: %lu\n", in_buf_size);
RtlInitUnicodeString(&uUnresolved, (WCHAR *) in_buf);
status = nt2dos(&uResolved, &uUnresolved);
if (!NT_SUCCESS(status))
return status;
*nbwritten = uResolved.Length + sizeof(WCHAR);
DbgPrint("nt_path_converter: resolved path: %wZ\n", &uResolved);
DbgPrint("nt_path_converter: resolved size: %Iu\n", *nbwritten);
if (out_buf_size < *nbwritten)
{
status = STATUS_BUFFER_OVERFLOW;
goto free_resolved;
}
RtlFillMemory(out_buf, *nbwritten, L'\0');
RtlCopyMemory(out_buf, uResolved.Buffer, uResolved.Length);
free_resolved:
ExFreePool(uResolved.Buffer);
return status;
}
static NTSTATUS device_ioctl(DEVICE_OBJECT *device_object, IRP *irp)
{
IO_STACK_LOCATION *io_stack_loc;
void* in_buf, *out_buf;
unsigned long in_buf_size, out_buf_size;
ioctl_handler handler;
NTSTATUS status = STATUS_UNSUCCESSFUL;
UNREFERENCED_PARAMETER(device_object);
irp->IoStatus.Status = status;
irp->IoStatus.Information = 0;
io_stack_loc = IoGetCurrentIrpStackLocation(irp);
in_buf = out_buf = irp->AssociatedIrp.SystemBuffer;
in_buf_size = io_stack_loc->Parameters.DeviceIoControl.InputBufferLength;
out_buf_size = io_stack_loc->Parameters.DeviceIoControl.OutputBufferLength;
switch (io_stack_loc->Parameters.DeviceIoControl.IoControlCode)
{
case CONVERT_NT_PATH:
handler = handle_convert_nt_path;
break;
default:
status = irp->IoStatus.Status = STATUS_NOT_SUPPORTED;
goto complete_request;
}
status = irp->IoStatus.Status = handler(
in_buf, in_buf_size,
out_buf, out_buf_size,
&irp->IoStatus.Information);
complete_request:
IoCompleteRequest(irp, IO_NO_INCREMENT);
return status;
}
typedef struct
{
const wchar_t *path;
const wchar_t *symlink;
}
DeviceInfo;
typedef struct
{
DEVICE_OBJECT *object;
UNICODE_STRING path;
UNICODE_STRING symlink;
}
Device;
#define NUMOF_DEVICES 1
static DeviceInfo devices_info[NUMOF_DEVICES] =
{
{
L"\\Device\\nt_path_converter",
L"\\DosDevices\\nt_path_converter",
},
};
static Device devices[NUMOF_DEVICES];
static void destroy_device(int i)
{
IoDeleteSymbolicLink(&devices[i].symlink);
IoDeleteDevice(devices[i].object);
}
void destroy_devices()
{
int i;
for (i = 0; i < NUMOF_DEVICES; ++i)
destroy_device(i);
}
static NTSTATUS set_up_device(DRIVER_OBJECT *driver_object, int i)
{
NTSTATUS status = STATUS_SUCCESS;
RtlInitUnicodeString(&devices[i].path, devices_info[i].path);
RtlInitUnicodeString(&devices[i].symlink, devices_info[i].symlink);
status = IoCreateDevice(
driver_object,
0,
&devices[i].path,
FILE_DEVICE_UNKNOWN,
FILE_DEVICE_SECURE_OPEN,
FALSE,
&devices[i].object);
if (!NT_SUCCESS(status))
return status;
devices[i].object->Flags |= DO_BUFFERED_IO;
devices[i].object->Flags &= ~DO_DEVICE_INITIALIZING;
if (!NT_SUCCESS(status = IoCreateSymbolicLink(
&devices[i].symlink, &devices[i].path)))
goto delete_device;
return status;
delete_device:
IoDeleteDevice(devices[i].object);
return status;
}
NTSTATUS set_up_devices(DRIVER_OBJECT *driver_object)
{
int i, j;
NTSTATUS status = STATUS_SUCCESS;
for (i = 0; i < NUMOF_DEVICES; ++i)
if (!NT_SUCCESS(status = set_up_device(driver_object, i)))
goto destroy_devices;
driver_object->MajorFunction[IRP_MJ_CREATE] = device_open;
driver_object->MajorFunction[IRP_MJ_DEVICE_CONTROL] = device_ioctl;
return status;
destroy_devices:
for (j = 0; j < i; ++j)
destroy_device(j);
return status;
}
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