pcsc−spy − A PC/SC spy command
pcsc-spy [−n|−−nocolor] [−d|−−diffable] [−h|−−help] [−v|−−version] [−t|−−thread] [fifo_filename]
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)
−d, −−diffable
Remove 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.
−t, −−thread
Add a thread number before each line of log to identify the calls from the same threads.
We will use the standard "LD_PRELOAD" loader option to load our spying library.
Example:
LD_PRELOAD=/usr/lib/x86_64−linux−gnu/libpcscspy.so pcsc_scan
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
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.
˜/pcsc−spy FIFO file is used by libpcsclite.so.1 to send the raw log lines
pcscd(8)
This manual page was written by Ludovic Rousseau <[email protected]>