Windows NT Driver >> Assembly

StartIO


參考資訊:
1. Four-F
2. Source Code

StartIO提供一個序列化的機制,讓使用者可以依照順序處理IRP,這個機制對於某些只能序列執行的硬體相當有幫助,省去用軟體實現序列化的程式碼,使用的步驟:
1. IoMarkIrpPending()
2. IoStartNextPacket()

main.asm

.386p
.model flat, stdcall
option casemap:none
 
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\Macros\Strings.mac
includelib c:\masm32\lib\wxp\i386\ntoskrnl.lib

public DriverEntry

OurDeviceExtension struct
  pNextDev PDEVICE_OBJECT ?
  szBuffer BYTE 255 dup(?)
OurDeviceExtension ends

.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

.code
StartIo proc pOurDevice:PDEVICE_OBJECT, pIrp:PIRP
  local pdx:PTR OurDeviceExtension
  local dwLen:DWORD
  local pBuf:DWORD
  
  mov eax, pOurDevice
  push (DEVICE_OBJECT PTR [eax]).DeviceExtension
  pop pdx
  
  mov eax, pIrp
  push (_IRP PTR [eax]).AssociatedIrp.SystemBuffer
  pop pBuf
  
  IoGetCurrentIrpStackLocation pIrp
  movzx eax, (IO_STACK_LOCATION PTR [eax]).MajorFunction
  .if eax == IRP_MJ_WRITE
    invoke DbgPrint, $CTA0("StartIo, IRP_MJ_WRITE")
    IoGetCurrentIrpStackLocation pIrp
    push (IO_STACK_LOCATION PTR [eax]).Parameters.Write._Length
    pop dwLen
    
    mov eax, pdx
    invoke memcpy, addr (OurDeviceExtension PTR [eax]).szBuffer, pBuf, dwLen
    invoke DbgPrint, $CTA0("Buffer: %s, Length: %d"), pBuf, dwLen
  .elseif eax == IRP_MJ_READ
    invoke DbgPrint, $CTA0("StartIo, IRP_MJ_READ")
    mov eax, pdx
    invoke strlen, addr (OurDeviceExtension PTR [eax]).szBuffer
    inc eax
    push eax
    pop dwLen
    
    mov eax, pdx
    invoke memcpy, pBuf, addr (OurDeviceExtension PTR [eax]).szBuffer, dwLen
  .endif
  
  mov eax, pIrp
  mov (_IRP PTR [eax]).IoStatus.Status, STATUS_SUCCESS
  push dwLen
  pop (_IRP PTR [eax]).IoStatus.Information
  fastcall IofCompleteRequest, pIrp, IO_NO_INCREMENT
  invoke IoStartNextPacket, pOurDevice, FALSE
  mov eax, STATUS_SUCCESS
  ret
StartIo endp

IrpFile proc pOurDevice:PDEVICE_OBJECT, pIrp:PIRP
  IoGetCurrentIrpStackLocation pIrp
  movzx eax, (IO_STACK_LOCATION PTR [eax]).MajorFunction
  .if (eax == IRP_MJ_CREATE) || (eax == IRP_MJ_CLOSE) 
    .if (eax == IRP_MJ_CREATE)
      invoke DbgPrint, $CTA0("IRP_MJ_CREATE")
    .else
      invoke DbgPrint, $CTA0("IRP_MJ_CLOSE")
    .endif
    mov eax, pIrp
    and (_IRP PTR [eax]).IoStatus.Information, 0
    mov (_IRP PTR [eax]).IoStatus.Status, STATUS_SUCCESS
    fastcall IofCompleteRequest, pIrp, IO_NO_INCREMENT
    mov eax, STATUS_SUCCESS
  .elseif (eax == IRP_MJ_READ) || (eax == IRP_MJ_WRITE)
    IoGetCurrentIrpStackLocation pIrp
    .if (eax == IRP_MJ_READ)
      invoke DbgPrint, $CTA0("IrpFile, IRP_MJ_READ")
    .else
      invoke DbgPrint, $CTA0("IrpFile, IRP_MJ_WRITE")
    .endif
    IoMarkIrpPending pIrp
    invoke IoStartPacket, pOurDevice, pIrp, 0, NULL
    mov eax, STATUS_PENDING
  .endif
  ret
IrpFile endp

Unload proc pOurDriver:PDRIVER_OBJECT
  local szSymName:UNICODE_STRING
              
  invoke RtlInitUnicodeString, addr szSymName, offset SYM_NAME
  invoke IoDeleteSymbolicLink, addr szSymName
              
  mov eax, pOurDriver
  invoke IoDeleteDevice, (DRIVER_OBJECT PTR [eax]).DeviceObject
  ret
Unload endp
       
DriverEntry proc pOurDriver:PDRIVER_OBJECT, pOurRegistry:PUNICODE_STRING
  local pOurDevice:PDEVICE_OBJECT
  local suDevName:UNICODE_STRING
  local szSymName:UNICODE_STRING
         
  mov eax, pOurDriver
  mov (DRIVER_OBJECT PTR [eax]).MajorFunction[IRP_MJ_CREATE * (sizeof PVOID)], offset IrpFile
  mov (DRIVER_OBJECT PTR [eax]).MajorFunction[IRP_MJ_CLOSE  * (sizeof PVOID)], offset IrpFile
  mov (DRIVER_OBJECT PTR [eax]).MajorFunction[IRP_MJ_WRITE  * (sizeof PVOID)], offset IrpFile
  mov (DRIVER_OBJECT PTR [eax]).MajorFunction[IRP_MJ_READ   * (sizeof PVOID)], offset IrpFile
  mov (DRIVER_OBJECT PTR [eax]).DriverStartIo, offset StartIo
  mov (DRIVER_OBJECT PTR [eax]).DriverUnload, offset Unload
         
  invoke RtlInitUnicodeString, addr suDevName, offset DEV_NAME
  invoke RtlInitUnicodeString, addr szSymName, offset SYM_NAME
  invoke IoCreateDevice, pOurDriver, sizeof OurDeviceExtension, addr suDevName, FILE_DEVICE_UNKNOWN, 0, FALSE, addr pOurDevice
  .if eax == STATUS_SUCCESS
    mov eax, pOurDevice
    or (DEVICE_OBJECT PTR [eax]).Flags, DO_BUFFERED_IO
    and (DEVICE_OBJECT PTR [eax]).Flags, not DO_DEVICE_INITIALIZING
    invoke IoCreateSymbolicLink, addr szSymName, addr suDevName
  .endif
  ret
DriverEntry endp
end DriverEntry
.end

IrpFile()IRP_MJ_READ和IRP_MJ_WRITE使用StartIO方式處理

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\Macros\Strings.mac
include c:\masm32\include\kernel32.inc

includelib c:\masm32\lib\user32.lib
includelib c:\masm32\lib\masm32.lib
includelib c:\masm32\lib\msvcrt.lib
includelib c:\masm32\lib\kernel32.lib

.const
DEV_NAME  db "\\.\MyDriver",0
ERR_OPEN  db "failed to open mydriver",10,13,0
MSG_SEND  db "I am error",0
MSG_WRITE db "WR: %s",10,13,0
MSG_READ  db "RD: %s",10,13,0
MSG_LEN   db "Length: %d",10,13,0

.data?
hFile     dd ?
dwRet     dd ?
szBuffer  db 255 dup(?)

.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, offset ERR_OPEN
    invoke ExitProcess, -1
  .endif
  mov hFile, eax

  invoke wsprintf, offset szBuffer, offset MSG_SEND
  invoke StrLen, offset szBuffer
  inc eax
  mov dwRet, eax
  invoke crt_printf, offset MSG_WRITE, offset szBuffer
  invoke crt_printf, offset MSG_LEN, dwRet
  invoke WriteFile, hFile, offset szBuffer, dwRet, offset dwRet, 0
  invoke crt_memset, offset szBuffer, 0, 255
  invoke ReadFile, hFile, offset szBuffer, 255, offset dwRet, 0
  invoke crt_printf, offset MSG_READ, offset szBuffer
  invoke crt_printf, offset MSG_LEN, dwRet
  invoke CloseHandle, hFile
  invoke ExitProcess, 0
end start

結果


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