Thanks for the info. I was going to go on a more "software" road.
I don't know if it's been done, but I thought about
adding a system call to the linux kernel, which imitate
the outb function, plus some logging features. My goal
was to actually use vmware (in which my fingerprinting
device works perfectly), and change in it's binary the call
to the outb function by an interruption to my new system call,
so the data could be collected.
Like you suggested, this might be illegal, but I heard that if
you just "sniff" the protocol to obtain interoperability with an
OS the company don't want to support, it's okay to do so
(if, of course, you don't disassemble their software or use
The vmware part was going to be illegal, I think.
Fortunately, a technician at an optical analisys lab in my
university offered me his help to analyse the protocol
used by my device. He told me he was doing this kind of
thing all the time and it was going to be easy to obtain
all the information I need on the protocol. His tools can measure
up to 183 data line at the same time, so the mere 18 or so needed
for the parallel port should be no problem :)
p.s. in case someone whant's to know, here's how the system call would
have looked like, without the logging part :
asmlinkage void sys_outb_hack(unsigned char value, unsigned short port)
__asm__ __volatile__ ("out" "b" " %" "b" "0,%" "w" "1" : : "a"
(value), "Nd" (port));
and a page to implement it :
I put it in linux/fs/outbhack.c and added it in the
fs/Makefile so it would be compiled easily in the kernel.
This HASN'T been tested but maybe it will help someone someday..
Selon Simon Krix <email@example.com>:
> On Fri, 2002-11-08 at 05:08, firstname.lastname@example.org wrote:
> > I read the archive of all posts about reverse engineering on this mailing
> > and I can't seem to find where to begin.. any suggestions?
> I used a small home-made circuit to reverse-engineer my scanner. You can
> see the details of my project here:
> This uses an ISA card based on a 8255C chip to read the signals on the
> parallel port while using the scanner on a slow Windows PC. I hear some
> people are using WINE to do the same thing more reliably. Be careful
> that you are not doing anything illegal, as some countries have more
> restrictive laws about reverse-engineering than others.
> Good luck.
> -- Simon Krix
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