From: Ludovic Rousseau (ludovic.rousseaugmail.com)
Date: Mon Aug 11 2008 - 10:10:04 CDT

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On Mon, Aug 11, 2008 at 3:47 PM, Wesley Nugent <wnugentabcsinc.com> wrote:
> Ok, this got it running and I'm able to connect now. I still get a seg
> fault when I try to run my read or write programs. What happens, it
> says please select reader from the list. If I hit enter, I get
> segfault, if I type anything in, it doesn't recognize the reader. I did
> a gdb with backtrace and get:
>
> #0 0xb7e2e463 in strlen () from /lib/tls/i686/cmov/libc.so.6
> #1 0xb7f0c457 in SCardConnect (hContext=16996003,
> szReader=0x1000 <Address 0x1000 out of bounds>, dwShareMode=2,
> dwPreferredProtocols=4, phCard=0xbf9e1758, pdwActiveProtocol=0xbf9e12f8
> at winscard_clnt.c:745
> #2 0x08048c50 in ?? ()

SCardConnect() is called with szReader=0x1000. szReader is supposed to
be a pointer to a C string containing the reader name to use.
It is clear that your application is using a wrong value here and can
only crash.

I am surprised your application ever worked.

> On a side note, I do have scriptor installed and can connect to the
> smart card reader using scriptor. It uses RAW protocol and comes up
> says reading commands from STDIN.
>
> Unfortunately, I don't know what commands to give it. If you could
> point me to the commands to read and write in raw mode, or where I can
> find these commands, I would appreciate it. Either help with the
> segfault or the commands to read/write with scriptor in RAW mode would
> be of great benefit to me.

I think you will have to reverse engineer the scard-read and
scard-write program (since you do not have the source code) and
rewrite them.

The --apdu pcscd option to log the apdu exchanged was introduced in
pcsc-lite 1.1.2beta1 and your "working" configuration is using
pcsc-lite 1.1.1. So it will not be easy to get the exchanged APDU.

Good luck,

--
 Dr. Ludovic Rousseau
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