Renaming Files (using MSVCRT)?

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optiplex

Joined: 07 Mar 2008
Posts: 7

optiplex 07 Mar 2008, 19:01

Hello

Im kinda new to FASM, and I want to rename a file.

Im using the msvcrt.dll

This is my template

Code:

; by optiplex

format PE CONSOLE 4.0
entry start

include 'INCLUDE\win32a.inc'

section ".code" code readable writeable executable


start:
     cinvoke printf, strMain
        ; rename file, wtf?

  cinvoke exit, 0

section '.data' data readable writeable
        
        strMain db 'Renaming cool.txt to mool.txt '
     strOld db 'C:\cool.txt'
      strNew db 'C:\mool.txt'

section '.idata' import data readable writeable

 library msvcrt, 'msvcrt.dll'

  import msvcrt,\
           getchar, 'getchar',\
             printf, 'printf',\
               puts, 'puts',\
           rename, 'rename',\
               exit, 'exit'

I tried various things like
cinvoke rename, strNew, strOld
or
push strNew
push strOld
call [rename]

Plz help me out, im a newb Sad

_________________
-optiplex-

07 Mar 2008, 19:01

edfed

Joined: 20 Feb 2006
Posts: 4336
Location: Now

edfed 07 Mar 2008, 19:32

[erf mode]
to modify the name, right clic on icon, then, rename.
or F2
or ren file.axt file.ext
[/erf mode]

i insert a general question in this thread.

how to modify, access, create, delete, read, write etc files in a "FILE SYSTEM independant" way?

is it possible?

07 Mar 2008, 19:32

wisepenguin

Joined: 30 Mar 2005
Posts: 129

wisepenguin 07 Mar 2008, 19:48

hello,

this works successfully for me using latest fasm 1.67.26

Code:

start: 
        cinvoke printf, strMain 
        cinvoke rename, strOld, strNew

        cinvoke exit, 0 

section '.data' data readable writeable 
         
        strMain db 'Renaming cool.txt to mool.txt ',0
        strOld db 'cool.txt',0
        strNew db 'mool.txt',0

you need to null terminate strings manually in FASM

have a good day

07 Mar 2008, 19:48

optiplex

Joined: 07 Mar 2008
Posts: 7

optiplex 07 Mar 2008, 20:05

Thank you wisepenguin.
But it didnt work for me Sad

Im also using the latest fasm 1.67.26, but the code doesnt work.

Code:

; rename example
; by optiplex


format PE CONSOLE 4.0

include 'INCLUDE\win32a.inc'


start:
        cinvoke printf, strMain 
        cinvoke rename, strOld, strNew
        cinvoke getchar, 0

        cinvoke exit, 0 

section '.data' data readable writeable 
         
        strMain db 'Renaming cool.txt to mool.txt ',0
        strOld db 'cool.txt',0
        strNew db 'mool.txt',0



section '.idata' import data readable writeable

        library msvcrt, 'msvcrt.dll'

        import msvcrt,\
        printf, 'printf',\
        getchar, 'getchar',\
        rename, 'rename',\
        exit, 'exit'

Any idea?

Thanks again.

07 Mar 2008, 20:05

wisepenguin

Joined: 30 Mar 2005
Posts: 129

wisepenguin 07 Mar 2008, 20:18

i ran mine on windows xp, with the following set up
my documents\test.exe (your code)
my documents\cool.txt

so the file to rename is in the same directory as the program.
but your first code hard coded it to "C:\cool.txt".

if you like change it back to C:\cool.txt and make sure C:\cool.txt
exists initially.

but i can still confirm, it works successfully here by null terminating
the strings.

i hope this helps, or you find the fault if it doesn't.

07 Mar 2008, 20:18

dap

Joined: 01 Dec 2007
Posts: 61
Location: Belgium

dap 07 Mar 2008, 20:33

optiplex wrote:

Thank you wisepenguin.
But it didnt work for me Sad

Im also using the latest fasm 1.67.26, but the code doesnt work.

Code:

; rename example
; by optiplex


format PE CONSOLE 4.0

include 'INCLUDE\win32a.inc'


start:
        cinvoke printf, strMain 
        cinvoke rename, strOld, strNew
        cinvoke getchar, 0

        cinvoke exit, 0 

section '.data' data readable writeable 
         
        strMain db 'Renaming cool.txt to mool.txt ',0
        strOld db 'cool.txt',0
        strNew db 'mool.txt',0



section '.idata' import data readable writeable

        library msvcrt, 'msvcrt.dll'

        import msvcrt,\
        printf, 'printf',\
        getchar, 'getchar',\
        rename, 'rename',\
        exit, 'exit'

Any idea?

Thanks again.

1 - getchar() doesn't require any parameter
2 - you don't need to call exit() here, you can use the instruction "ret" instead but remember that EAX must contain the return value of main()

_________________
(French only) http://dap.developpez.com

07 Mar 2008, 20:33

optiplex

Joined: 07 Mar 2008
Posts: 7

optiplex 08 Mar 2008, 07:27

Okay, I got it working now

Thank wisepenguin, and thank you too dap for the tips Smile

08 Mar 2008, 07:27

wisepenguin

Joined: 30 Mar 2005
Posts: 129

wisepenguin 08 Mar 2008, 11:51

anytime.

what was the problem in the end ?

08 Mar 2008, 11:51

optiplex

Joined: 07 Mar 2008
Posts: 7

optiplex 08 Mar 2008, 21:34

I think it was because of the pathes, i used C:\cool.txt > C:\mool.txt, but when I had them in the same directory as the program, like you did, it worked for me.

08 Mar 2008, 21:34

Goplat

Joined: 15 Sep 2006
Posts: 181

Goplat 09 Mar 2008, 03:29

Why is this in the DOS forum?

09 Mar 2008, 03:29

dap

Joined: 01 Dec 2007
Posts: 61
Location: Belgium

dap 09 Mar 2008, 10:02

This works on my computer :

Code:

format PE console 4.0
entry start

include 'win32a.inc'

section '.text' code readable executable
start:
        push ebp
        mov ebp, esp
        
        push new
        push old
        call [rename]
        pop ecx ecx

; rename() returns zero if the operation succeeds
        test eax, eax
        jnz .failure
        
        push success
        call [puts]
        pop ecx
        
.failure:
        pop ebp
        xor eax, eax
        ret
        

section '.rdata' data readable        
        old  db  'C:\Documents and Settings\Bastien\Bureau\cool.txt', 0
        new  db  'C:\Documents and Settings\Bastien\Bureau\mool.txt', 0
        success  db  'Success', 0


section '.idata' data readable import
        library msvcrt,   'msvcrt.dll'
        import msvcrt, \
          rename, 'rename',  \
          puts,   'puts'

_________________
(French only) http://dap.developpez.com

09 Mar 2008, 10:02

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20343
Location: In your JS exploiting you and your system

revolution 09 Mar 2008, 10:05

You can also use the API MoveFile or MoveFileEx, no need to use msvcrt.

09 Mar 2008, 10:05

DOS386

Joined: 08 Dec 2006
Posts: 1902

DOS386 10 Mar 2008, 06:46

Last edited by DOS386 on 12 Mar 2008, 01:02; edited 1 time in total

10 Mar 2008, 06:46

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20343
Location: In your JS exploiting you and your system

revolution 10 Mar 2008, 06:53

Okay, no problem, if ever I manage to catch a mod roaming around doing nothing I will be sure to grab him by the collar point him here.

10 Mar 2008, 06:53

asmrox

Joined: 19 Jan 2008
Posts: 160

asmrox 10 Mar 2008, 13:34

when you use pe format, why dont u call from kernel32? MoveFile.
and you dont have to 'exit'. Pogram is loading by call from CsrCreateThread, and must return to CsrExitThread.

Code:

format PE CONSOLE 4.0
entry start

also entrypoint is not needed. format pe console is enought.

10 Mar 2008, 13:34

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20343
Location: In your JS exploiting you and your system

revolution 10 Mar 2008, 13:38

asmrox wrote:

also entrypoint is not needed. format pe console is enought.

AFAIK "entry" is required .

10 Mar 2008, 13:38

asmrox

Joined: 19 Jan 2008
Posts: 160

asmrox 10 Mar 2008, 17:20

in exe no. Program will start executing from executable section, or smth like tat

10 Mar 2008, 17:20

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20343
Location: In your JS exploiting you and your system

revolution 10 Mar 2008, 17:22

asmrox wrote:

in exe no. Program will start executing from executable section, or smth like tat

No it doesn't. Windows will call the location defined by 'entry'.

10 Mar 2008, 17:22

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