Kernel Mode Driver Framework >> Assembly (PNP) >> IOCTL

IRP


參考資訊:
1. Source Code

Input Output Control(IOCTL)是另一種可以跟驅動程式溝通的方式,本身帶有命令參數,驅動程式可以依據不一樣的命令做不一樣的事情,而除了命令以外,IOCTL更把Buffer切成Input和Output兩塊,單一次命令的運作就可以完成讀寫的動作,Buffer的屬性也是需要做設定才可以使用,分為Buffered、Direct和Neither這三種設定方式,感覺是不是跟File的Buffer設定方式很相似呢?沒錯,基本上是一樣的,雖然司徒講得有點複雜,不過,只要把Buffer的設定方式搞懂後,使用者就可以發現,整個運作原理是相當容易理解的。

當然,使用者可能好奇,EvtIoRead和EvtIoWrite是否可以取代EvtIoDeviceControl的功能呢?答案:肯定是可以的,只要把資料做編碼,功能上是可以取代的,只是這樣的作法,把控制應用以及大量傳輸的概念都綁在一起,失去原有的設計本質,因此,如果以資料為傳輸目的,建議使用EvtIoRead和EvtIoWrite,而以控制應用為目的時,則建議使用EvtIoDeviceControl的方式。

至於IOCTL命令到底是什麼東西呢?其實就是一個編碼後的32Bit的數值,欄位如下所示:

#define CTL_CODE(DeviceType, Function, Transfer, Access) (((DeviceType) << 16) | ((Access) << 14) | ((Function) << 2) | (Transfer))

表格如下:

Ref. defining-i-o-control-codes
透過Microsoft的Macro(CTL_CODE)定義該數值,說穿了,只要App跟驅動程式都可以互相知道對方的意思(IOCTL命令)就可以,當然有一些是Microsoft定義保留的Global IOCTL,在使用上,需要特別注意一下。

對應的溝通管道:

Win32 API Kernel Event
CreateFile() EvtDeviceFileCreate
DeviceIoControl() EvtIoDeviceControl
CloseFile() EvtFileClose

取得方式:

IOCTL Code
傳入的第五個參數

main.asm

.386p
.model flat, stdcall
option casemap:none

include c:\masm32\Macros\Strings.mac
include c:\masm32\include\w2k\ntdef.inc
include c:\masm32\include\w2k\ntstatus.inc
include c:\masm32\include\w2k\ntddk.inc
include c:\masm32\include\w2k\ntoskrnl.inc
include c:\masm32\include\w2k\ntddkbd.inc
include c:\masm32\include\wxp\wdm.inc
include c:\masm32\include\wdf\umdf\1.9\wudfddi_types.inc
include c:\masm32\include\wdf\kmdf\1.9\wdf.inc
include c:\masm32\include\wdf\kmdf\1.9\wdftypes.inc
include c:\masm32\include\wdf\kmdf\1.9\wdfglobals.inc
include c:\masm32\include\wdf\kmdf\1.9\wdffuncenum.inc
include c:\masm32\include\wdf\kmdf\1.9\wdfobject.inc
include c:\masm32\include\wdf\kmdf\1.9\wdfdevice.inc
include c:\masm32\include\wdf\kmdf\1.9\wdfdriver.inc
include c:\masm32\include\wdf\kmdf\1.9\wdfrequest.inc
include c:\masm32\include\wdf\kmdf\1.9\wdfio.inc
include c:\masm32\include\wdf\kmdf\1.9\wdfmemory.inc

includelib c:\masm32\lib\wxp\i386\BufferOverflowK.lib 
includelib c:\masm32\lib\wxp\i386\ntoskrnl.lib 
includelib c:\masm32\lib\wxp\i386\hal.lib 
includelib c:\masm32\lib\wxp\i386\wmilib.lib 
includelib c:\masm32\lib\wxp\i386\sehupd.lib 
includelib c:\masm32\lib\wdf\kmdf\i386\1.9\wdfldr.lib
includelib c:\masm32\lib\wdf\kmdf\i386\1.9\wdfdriverentry.lib

public DriverEntry
IOCTL_TEST equ CTL_CODE(FILE_DEVICE_UNKNOWN, 800h, METHOD_BUFFERED, FILE_ANY_ACCESS)

.const
DEV_NAME word "\","D","e","v","i","c","e","\","M","y","D","r","i","v","e","r",0
SYM_NAME word "\","D","o","s","D","e","v","i","c","e","s","\","M","y","D","r","i","v","e","r",0
MSG_IOCTL byte "IOCTL_TEST",0

.code
IrpFileCreate proc Device:WDFDEVICE, Request:WDFREQUEST, FileObject:WDFFILEOBJECT
  invoke DbgPrint, $CTA0("IrpFieCreate")
  invoke WdfRequestComplete, Request, STATUS_SUCCESS
  ret
IrpFileCreate endp

IrpFileClose proc FileObject:WDFFILEOBJECT
  invoke DbgPrint, $CTA0("IrpFieClose")
  ret
IrpFileClose endp

IrpIOCTL proc Queue:WDFQUEUE, Request:WDFREQUEST, OutputBufferLength:DWORD, InputBufferLength:DWORD, IoControlCode:DWORD
  .if IoControlCode == IOCTL_TEST
    invoke DbgPrint, offset MSG_IOCTL
  .endif
  invoke WdfRequestComplete, Request, STATUS_SUCCESS
  ret
IrpIOCTL endp

AddDevice proc Driver:WDFDRIVER, pDeviceInit:PWDFDEVICE_INIT
  local device:WDFDEVICE
  local suDevName:UNICODE_STRING
  local szSymName:UNICODE_STRING
  local file_cfg:WDF_FILEOBJECT_CONFIG
  local ioqueue_cfg:WDF_IO_QUEUE_CONFIG

  invoke RtlInitUnicodeString, addr suDevName, offset DEV_NAME
  invoke RtlInitUnicodeString, addr szSymName, offset SYM_NAME
  invoke WdfDeviceInitAssignName, pDeviceInit, addr suDevName
  invoke WdfDeviceInitSetIoType, pDeviceInit, WdfDeviceIoBuffered
  invoke WDF_FILEOBJECT_CONFIG_INIT, addr file_cfg, offset IrpFileCreate, offset IrpFileClose, NULL
  invoke WdfDeviceInitSetFileObjectConfig, pDeviceInit, addr file_cfg, WDF_NO_OBJECT_ATTRIBUTES
  invoke WdfDeviceCreate, addr pDeviceInit, WDF_NO_OBJECT_ATTRIBUTES, addr device
  invoke WdfDeviceCreateSymbolicLink, device, addr szSymName
  invoke WDF_IO_QUEUE_CONFIG_INIT_DEFAULT_QUEUE, addr ioqueue_cfg, WdfIoQueueDispatchSequential
  lea eax, ioqueue_cfg
  mov (WDF_IO_QUEUE_CONFIG ptr [eax]).EvtIoDeviceControl, offset IrpIOCTL
  invoke WdfIoQueueCreate, device, addr ioqueue_cfg, WDF_NO_OBJECT_ATTRIBUTES, WDF_NO_HANDLE
  ret
AddDevice endp

DriverEntry proc pOurDriver:PDRIVER_OBJECT, pOurRegistry:PUNICODE_STRING
  local config:WDF_DRIVER_CONFIG
  
  invoke WDF_DRIVER_CONFIG_INIT, addr config, AddDevice
  invoke WdfDriverCreate, pOurDriver, pOurRegistry, WDF_NO_OBJECT_ATTRIBUTES, addr config, WDF_NO_HANDLE
  ret
DriverEntry endp
end DriverEntry
.end

IrpIOCTL()僅列印IOCTL_TEST命令。

app.asm

.386p
.model flat, stdcall
option casemap:none

include c:\masm32\include\windows.inc
include c:\masm32\include\masm32.inc
include c:\masm32\include\user32.inc
include c:\masm32\include\msvcrt.inc
include c:\masm32\include\kernel32.inc
include c:\masm32\include\w2k\ntddkbd.inc
include c:\masm32\Macros\Strings.mac
 
includelib c:\masm32\lib\user32.lib
includelib c:\masm32\lib\masm32.lib
includelib c:\masm32\lib\msvcrt.lib
includelib c:\masm32\lib\kernel32.lib

IOCTL_TEST equ CTL_CODE(FILE_DEVICE_UNKNOWN, 800h, METHOD_BUFFERED, FILE_ANY_ACCESS)

.const 
DEV_NAME db "\\.\MyDriver",0

.data?
hFile dd ?
dwRet dd ?

.code
start:
  invoke CreateFile, offset DEV_NAME, GENERIC_READ or GENERIC_WRITE, FILE_SHARE_READ, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0
  .if eax == INVALID_HANDLE_VALUE
    invoke crt_printf, $CTA0("failed to open mydriver")
    invoke ExitProcess, -1
  .endif
  
  mov hFile, eax
  invoke DeviceIoControl, hFile, IOCTL_TEST, NULL, 0, NULL, 0, offset dwRet, NULL
  invoke CloseHandle, hFile
  invoke ExitProcess, 0
  
end start

結果


返回上一頁