CommandLineToArgvW test / PE brewing

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DOS386

Joined: 08 Dec 2006
Posts: 1898

DOS386 27 Nov 2009, 07:07

Note: this is deliberately posted in Main since related to both DOS and Win32.

Note to Edfed & Co : this doesn't work in Windaube 98 & Co (see shot below) Laughing

Code:

        pope   eax            ; Our silly "PO-inter" | Now stack is neutral
        pushd  0              ; Reserved UINT32 for output
        mov    ecx, esp       ; Now points to the reserved UINT32
        push   ecx            ; Output: number of args captured 
        push   eax            ; Input PO-inter
        call   dword [CommandLineToArgvW]   ; Result PO-inter in EAX
        push   eax            ; PO-inter is at [ESP] | Amount is at [ESP+4]

Download now (37 KiB) : id=4673 Smile

Purposes of the thing:

- PE brewing example

- Win32 console example

- GetCommandlineAW & CommandLineToArgvW usage example

- Preparing future CommandLineToArgvW implementation in DOS Shocked

UPDATED 2013-Apr-10

Last edited by DOS386 on 10 Apr 2013, 13:12; edited 3 times in total

27 Nov 2009, 07:07

DOS386

Joined: 08 Dec 2006
Posts: 1898

DOS386 30 Nov 2009, 06:40

2 more shots are available exclusively inside the archive Smile

30 Nov 2009, 06:40

Borsuc

Joined: 29 Dec 2005
Posts: 2465
Location: Bucharest, Romania

Borsuc 30 Nov 2009, 19:43

pope?

_________________
Previously known as The_Grey_Beast

30 Nov 2009, 19:43

f0dder

Joined: 19 Feb 2004
Posts: 3175
Location: Denmark

f0dder 30 Nov 2009, 21:26

Ugh. My eyes are bleeding after looking at that code.

30 Nov 2009, 21:26

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 30 Nov 2009, 21:53

Yeah. Looks so... custom. What's wrong with printf again?

30 Nov 2009, 21:53

Borsuc

Joined: 29 Dec 2005
Posts: 2465
Location: Bucharest, Romania

Borsuc 01 Dec 2009, 03:47

Code isn't that bad, but I still don't get what's with the pope Smile

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Previously known as The_Grey_Beast

01 Dec 2009, 03:47

DOS386

Joined: 08 Dec 2006
Posts: 1898

DOS386 01 Dec 2009, 14:05

> What's wrong with printf again?

Instead of what instruction ?

01 Dec 2009, 14:05

DOS386

Joined: 08 Dec 2006
Posts: 1898

DOS386 10 Apr 2013, 13:15

UPDATED - added PString example as competition against CommandLineToArgvW Shocked

Code:

        ; We can try to copy it (may be terminated by space or ZERO !!!)

        mov    ch, 0                ; Single arg size
arg_copy_loop:
        cmp    ch, ccsngarglim      ; Check single arg size limit
        jae    short parse_abort    ; Bad luck 
        mov    ah, dl               ; DL already validated dest size
        add    ah, ch               ; CH incomplete source and dest raw size
        cmp    ah, (ccoutbufsiz-3)  ; Reserv 3 Byte's | Const limit 61 to 252
        jae    short parse_abort    ; Bad luck 
        cmp    al, 32
        jb     short patch_dot
        cmp    al, 127              ; "~" + 1
        jb     short no_patch_dot
patch_dot:
        mov    al, 46               ; Dot "."
no_patch_dot:
        inc    edi                  ; & Place char to [EDI+1]
        stosb                       ; & After this EDI will point
        dec    edi                  ; & to the char
        inc    ch                   ; Single arg size
        cmp    dh, 240
        ja     short parse_abort    ; OK, this was the hard source limit
        mov    al, [esi]            ; Do NOT use LODSB !!!
        and    al, 223              ; Test for 32 and ZERO | 255 - 32 = 223
        jz     short copied_him_wow ; We DID NOT inc, "arg_space_loop" will
        lodsb
        inc    dh                   ; Source commandline string size
        jmp    short arg_copy_loop
        ;-------------------------

Please download it again (the old files are still in and unchanged)

http://board.flatassembler.net/download.php?id=4673

10 Apr 2013, 13:15

baldr

Joined: 19 Mar 2008
Posts: 1651

baldr 10 Apr 2013, 22:32

DOS386,

If CommandLineToArgvW() is stdcall (as it looks like), mov ecx, esp / push ecx can be replaced with simple push esp, isn't it?

10 Apr 2013, 22:32

KevinN

Joined: 09 Oct 2012
Posts: 160

KevinN 11 Apr 2013, 00:36

cool

11 Apr 2013, 00:36

DOS386

Joined: 08 Dec 2006
Posts: 1898

DOS386 13 Apr 2013, 06:58

> If CommandLineToArgvW() is stdcall (as it looks like),
> mov ecx, esp / push ecx can be replaced with simple push esp

Maybe true ... maybe PUSH ESP was dangerous ... or did this problem exist on 8086 with PUSH SP only ?

BTW, was anyone (Revolution ?) able to "break" my "TESTCMPS.EXE" - make it crash or produce garbage or corrupt memory ?

13 Apr 2013, 06:58

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 19872
Location: In your JS exploiting you and your system

revolution 13 Apr 2013, 11:34

DOS386 wrote:

BTW, was anyone (Revolution ?) able to "break" my "TESTCMPS.EXE" - make it crash or produce garbage or corrupt memory ?

Not me. I don't even know what you are asking about, but if it runs under DOS then I won't be able to test it.

13 Apr 2013, 11:34

ACP

Joined: 23 Sep 2006
Posts: 204

ACP 13 Apr 2013, 20:37

DOS386 wrote:

Maybe true ... maybe PUSH ESP was dangerous ... or did this problem exist on 8086 with PUSH SP only ?

Are you referring to the fact that push (e)sp works differently on >=386 than on 8086 or do you mean something else?

13 Apr 2013, 20:37

DOS386

Joined: 08 Dec 2006
Posts: 1898

DOS386 15 Apr 2013, 13:55

> Are you referring to the fact that push (e)sp works
> differently on >=386 than on 8086

YES. The idea of "PUSH SP" or ESP or RSP or ISP (Insane Stack Pointer - 1024 bits wide on XXXX1024 CPU's available soon) is somewhat strange to me, but there apparently exists at least one piece of code that can use it Smile

> but if it runs under DOS then I won't be able to test it

It runs also in DOS.

15 Apr 2013, 13:55

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