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Re: [Muscle] Enabling Extended APDU in default Mac pcscd

From: Ludovic Rousseau (ludovic.rousseaugmail.com)
Date: Wed Mar 29 2006 - 00:50:13 CST

I was wrong :-)

On 28/03/06, Ludovic Rousseau <ludovic.rousseaugmail.com> wrote:
> On 27/03/06, Joseph Antony <ajosephantonygmail.com> wrote:
> > On 3/27/06, Martin Paljak <martin.paljakgmail.com> wrote:
> > > /System/Library/Frameworks/PCSC.framework/Versions/A/Headers/pcsclite.h
> > >
> > > It also contains a comment on the define and where to enable it
> > > (everywhere) if you want to use it.
> > >
> > I believe that we need to update the config.h file present in
> > "src/PCSC/config.h". SmartcardServices-31 (10.4.3) seems to already
> > work with large APDUs. But, I could not find any macro definition for
> > PCSCLITE_ENHANCED_MESSAGING. I am confused how it works if that macro
> > is not defined. What am I missing here?
>
> You can compile your application without defining
> PCSCLITE_ENHANCED_MESSAGING. It will/should work with the framework
> and pcscd even if the framework and pcscd are compiled with
> PCSCLITE_ENHANCED_MESSAGING.
>
> But you can't use your application with PCSCLITE_ENHANCED_MESSAGING
> defined if the framework and pcscd are not compiled with
> PCSCLITE_ENHANCED_MESSAGING. You will have buffer overflows since the
> framework and pcscd do not expect large APDUs.

It will not (should not) crash or have strange effects. You will just
get a SCARD_E_INSUFFICIENT_BUFFER error if you use a too big buffer.
So it is safe to always use PCSCLITE_ENHANCED_MESSAGING in your
application. But it will (just) not work on framework without support
of PCSCLITE_ENHANCED_MESSAGING.

> The communication between the lib and pcscd should be reworked to
> solve this problem (and some others). Any help or funding is welcome.

This remark is still valid

--
  Dr. Ludovic Rousseau

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