NAME¶

pcsc-spy - A PC/SC spy command

SYNOPSIS¶

pcsc-spy [ -n|--nocolor] [-d|--diffable] [-h|--help] [ fifo_filename]

DESCRIPTION¶

pcsc-spy displays PC/SC calls of an application. It must be used with the libpcscspy.so library. To be able to spy the PC/SC layer, the application flow must be modified so that all PC/SC calls are redirected. Two options are available:

- the application is linked with libpcsclite.so.1

- the application loads the libpcsclite.so.1 library using dlopen(3)

OPTIONS¶

-d, --diffable

Demove the variable parts (like handler values) from the output so that two execution can be more easily compared.

-h, --help

Display a short help text.

-n, --nocolor

Disable the output colorization (if you want redirect the output in a file for example).

-v, --version

Print the version of the pcsc-spy program plus a copyright, a list of authors.

EXAMPLES¶

Applications linked with libpcsclite.so.1¶

We will use the standard LD_PRELOAD loader option to load our spying library. Example:
LD_PRELOAD=/usr/lib/libpcscspy.so opensc-tool -a

Application loading libpcsclite.so.1¶

This is the case for the PC/SC wrappers like pyscard (for Python) and pcsc-perl (for Perl). The LD_PRELOAD mechanism can't be used. Instead we replace the libpcsclite.so.1 library by the spying one. You may use install_spy.sh and uninstall_spy.sh to install and uninstall the spying library. Using the spying library without pcsc-spy is not a problem but has side effects: - a line "libpcsclite_nospy.so.1: cannot open shared object file: No such file or directory" will be displayed - some CPU time will be lost because of the PC/SC calls redirection

Starting the spy tool¶

 pcsc-spy

If a command argument is passed we use it instead of the default ~/pcsc-spy FIFO file. It is then possible to record an execution log and use pcsc-spy multiple times on the same log. To create the log file just do:

 mkfifo ~/pcsc-spy
 cat ~/pcsc-spy > logfile

and run your PC/SC application.

Mac OS X¶

The installation is not automatic. In the pcsc-lite/src/spy directory do:
make framework Then copy the PCSC.framework directory in /tmp
cp -a PCSC.framework /tmp Copy the official PCSC.framework (binary only) in /tmp
cp /System/Library/Frameworks/PCSC.framework/PCSC /tmp Run the application to debug as:
DYLD_FRAMEWORK_PATH=/tmp pcsctest

FILES¶

~/pcsc-spy FIFO file is used by libpcsclite.so.1 to send the raw log lines

SEE ALSO¶

pcscd(8)

AUTHOR¶

This manual page was written by Ludovic Rousseau <rousseau@free.fr>