PCSC-SPY(1) PC/SC lite PCSC-SPY(1)
NAME
pcsc-spy - A PC/SC spy command
SYNOPSIS
pcsc-spy [-n|--nocolor] [-d|--diffable] [-h|--help] [-v|--version]
[-t|--thread] [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
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.
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/x86_64-linux-gnu/libpcscspy.so pcsc_scan
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.
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>
pcsc-lite 1.9.9 2023-04-11 PCSC-SPY(1)
Generated by dwww version 1.15 on Sat Jun 29 01:55:06 CEST 2024.