How MS made XP Dos bootdisk, Can people check their XP and report? Options

[Nuno Brito]

I'm quite interested in learning more about these "hidden" features within common microsoft files - seems a lot of code is copied or bundled across different versions/releases ever since win31..

This link might be interesting (if you didn't knew it already..)

I'll do a small .script to test an OS and report back some info in a text file - this task is really easy since I think you've done all the hard work involved - do you need any additional features?

[Nuno Brito]

Here is the .script - to use just copy the code below and save to a text file (don't forget to add .script as extension)


This script will unpack gsar.exe and output the result into a text file. Your default text editor will open this file to ease copying back the results..

CODE

[main]
Title=Test Image
Description=This .script will your current windows version to check the details on the boot image within diskcopy.dll
selected=true
Level=3
Credits=JacLaz - the reason for this .script to exist..
Author=Nuno Brito
Contact=http://www.911cd.net/forums//index.php?showtopic=16745
Date=
Version=1.0

[EncodedFolders]
Folder

[EncodedFile-Folder-gsar.exe]
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UijkMYhpSBZoJ9WSKshlaAeINkg7YH0CCT3qX8v/at3u+vlYBtsU58iYodPtoeDLon+41LfIDt9Ad74GtklyZjd52yTAPaUuVmSHQH+8x+xwyXRL57sn2AA3
NXkMH6HDgQhv5Ec9kWcstwJ+YfI4Ygk06+2ZD/kZadMisnhw0eh0ukLOMNHI6QWyqHDh6VAuy8cDBCyD8qAdNgZCh2WO0MSSt1ODrskkBbzL2Tx+h7kGXV
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[Folder]
gsar.exe=8212,10954

[process]
echo,1,"Extracting files.."
ExtractAllFiles,1,"%ScriptFile%","Folder","%tempdir%"
echo,1,"Starting test.."
ShellExecute,1,hide,"cmd.exe","/c  %tempdir%gsar.exe -b -s:xEB:x3C:x90:x2A:x2D:x76:x34:x56:x49:x48:x43:x00 %SystemRoot%\System32\diskcopy.dll >> %tempdir%result.txt"
ShellExecute,1,open,"%tempdir%result.txt",""
echo,1,"Deleting temporary files.."
FileDelete,1,"%tempdir%gsar.exe"
FileDelete,1,"%tempdir%result.txt"

A custom ready to use Batcher with this test script file are available at:

hxxp://nunobrito.100free.com/Test/testImage.zip
(Copy & paste to the explorer bar to download)


Good luck testing!

[jaclaz]

@nuno
Yep, it works allright, thanks , but actually what I meant was doing the entire generation of the DOS floppy image, as described here:
http://www.911cd.net/forums//index.php?showtopic=16745&st=4
(I know that it can become quite a bit of work)

One could add to the bfi "build" directory autoexec.bat, config.sys and some FREEDOS utilities, like FDISK/FORMAT, and so on...and have a handy "boot floppy maker", as an example very suitable for El-Torito boot CD's.

The main thing, which is that the "label" of the floppy remains the same in All languages and releases seem to be confirmed.

The problem I have found in making a simple batch file, but maybe I simply did not find the "right" method or did not try hard enough is to get the result of gsar (hex addrees) and "feed" it to dsfo (decimal).

Or there is possibly a way to get just the three needed files without extracting the image then using the mtools on it?

If the floppy is always the same, maybe files can be extracted directly with dsfo.

Or maybe there are other programs that can do the same more simply, after all, since we are working on a copy of a file, there is no "direct hardware access", everything is done operating with files....?

jaclaz

[Nuno Brito]

I'm a bit in doubt about the format of the .img files, but if they are in raw mode (bit per bit floppy image) I can easily set up a custom tool to search and extract a file segment from a specified byte signature pattern.

This would probably ease things, avoiding the use of multiple tools and required conversions between them (perhaps only mtools are absolutely required for handling img files..)


Today's Goal: make a XP/2003 boot disk..


Ok, I'll get my hands on the task right away, may take a bit longer but will keep you posted of my progress..

[jaclaz]

Yes, .ima/.img files are bit by bit copies of a floppy.

Happy you joined in!

One thing I did not check, is whether the files are contiguous on the floppy images, in which case it is even possible to simply extract the files....

jaclaz

[jaclaz]

Ok, it appears like files are contiguous:
1) we don't actually need to extract MSDOS.SYS file, which is plain text file so that it is easier to recreate it

CODE

echo;W98EBD> MSDOS.SYS

(or one could possibly experiment tweaking it as detailed by MDGX guide):
http://www.mdgx.com/msdos.htm

2) IO.SYS beginning can be found searching for

4D5A000000000000A01C

it begins at 4200hex in my copy, length is 116.736

3) COMMAND.COM beginning can be found searching for:

4D5A7001B6

it begins at 73C00hex in my copy, length is 93.040 bytes

Maybe the above approach is "less elegant" than the original one, but should be as effective....

jaclaz

[Nuno Brito]

If I didn't knew better, I'd say you have telepatic skills..

Finished the interface of for a small program this afternoon - but got stuck on the file extracting part - after googling a bit, found some solutions that might work as I expect. At this precise moment I was still trying to figure out the file position from where to extract each file inside diskcopy.dll for starting some tests..


Wikipedia confirmed that .img format in raw bit per bit - only .imz is zipped (gzip?, zip?)




After having a more stable version working I'll make it work from the command line to suit batch purposes..

[jaclaz]

Wikipedia confirmed that .img format in raw bit per bit - only .imz is zipped (gzip?, zip?)

.imz is the compressed format Winimage by Gilles Vollant uses, the format is ZIP, info-zip library if I recall correctly.

jaclaz

[Nuno Brito]

DiskExtract

This is a small program that will search for a byte sequence and extract a specified number of bytes into a new file.

Download link:
http://rapidshare.de/files/19815398/DiskExtract01.zip.html


How to use?

- Download, extract, run program
- Press the "play" button to extract the image file


Features:

- All used settings are stored inside an INI file in the same directory as the program.
- It is possible to use %WindowsDir% as a variable that points to your local windows directory.


Know bugs

- None I could find at the moment - I've added some routines to ensure all values were valid before processing


Comments

JacLaz, I hope this was similar to what you were expecting..

I'm not sure about the bytes to copy length, but I've used this test value and worked fine - I'm a bit confused on this, can you please indicate the real size of this image?

In the future I will add command line support and invisible mode for batch files..


Final note

I can really thank JacLaz for pointing me back into this direction - I've learned a whole lot regarding files and streams, I already knew how to do this type of stuff on Turbo Pascal 7 age in DOS - but things have changed quite a bit since delphi appeared on scene - felt good to catch up with these changes..

[jaclaz]

VERY good work!

A "normal" 1.44 floppy image, like the one we are talking about is exactly
1,474,560 bytes

More sizes, see here:
http://www.911cd.net/forums//index.php?showtopic=10853&st=18


Feature request:
1) Maybe you could also put a search box for "text" and, cannot say if it possible, you should avoid using commas to separate hex values, so that "copy and paste" can be easily possible.
2) Also if it was possible to display the address where the string is found before extracting the data, it would be nice....

jaclaz

[Nuno Brito]

A "normal" 1.44 floppy image, like the one we are talking about is exactly
1,474,560 bytes

Added this number as default value

Feature request:
1) Maybe you could also put a search box for "text" and, cannot say if it possible, you should avoid using commas to separate hex values, so that "copy and paste" can be easily possible.

I just didn't added without commas in order to improve readability - next version will work without them..

2) Also if it was possible to display the address where the string is found before extracting the data, it would be nice....

Added a dialog box that displays the HEX adress offset - I was using decimal numbers mostly to stay on track and better understand where bugs were appearing - after a match is found you can select to save it into a new file


Finaly uploaded this file to my web host the link is here:
http://nunobrito.100free.com/Tools/DiskExtract01.zip
(copy & paste link to explorer bar)

[jaclaz]

EXCELLENT!

jaclaz

[Nuno Brito]

Made some modifications, now it isn't necessary to add commas to separate the hex values..

Added a wildcard option and recurse subdirectories search - this will allow (for example) to search all windows files from the base dir recursing to each subdir and file matching the wildcard like: c:\windows\*.dll or c:\windows\*.*



here's the updated link (and permanent link)

http://nunobrito.100free.com/Tools/DiskExtract.zip

(copy & paste to explorer bar to properly download, size: ~170Kb)


Hope you like the changes..

[Nuno Brito]

Current download location for DiskExtract can be found here: http://nunobrito.eu/download.php?view.3


Still the same work method to extract a MSDOS boot disk - click extract and get a fresh DOS boot disk image straight from your windows machine.

[jacevedo3]

Hi!,
I understand you whant to build the BootDisk with batch files so you need a console application to extract the image from diskcopy.dll I wrote an application to get the image you can download from http://jacevedo.phstech.info/getbtdsk.zip
I hope it helps.

[jacevedo3]

Hi again!,
To extract the files IO.SYS, MSDOS.SYS and COMMAND.COM from the BootDisk image once this is extracted from diskcopy.dll I recomend to use Vincent Mallet's DCFR.EXE can be downloaded from ftp://ftp.sac.sk/pub/sac/utildisk/dcfr004.zip and to get the Boot Sector use Bart's MKBT.EXE

[jaclaz]

@jacevedo3

Thank you for your contributions, having another method, and a "cleaner" one is definitely a good thing!

One question:
does XPBTDSK.EXE search for the "*-v4VIHC" label (or some other "typical" string) or does it use a "fixed" address (and is thus suitable only for some versions of the file)?

jaclaz

[jacevedo3]

You are welcome. XPBTDSK.EXE searches for the first 12 bytes (in HEX: EB 3C 90 2A 2D 76 34 56 49 48 43 00) of the BootDisk image so it will work with the different language versions.

[jaclaz]

You are welcome. XPBTDSK.EXE searches for the first 12 bytes (in HEX: EB 3C 90 2A 2D 76 34 56 49 48 43 00) of the BootDisk image so it will work with the different language versions.

Thanks.

jaclaz