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
