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#! /usr/bin/env python3
"""
get_usb_path.py: get USB path of readers
Copyright (C) 2026 Ludovic Rousseau
"""
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, see <http://www.gnu.org/licenses/>.
import struct
import smartcard
from smartcard.pcsc.PCSCPart10 import SCARD_CTL_CODE
from smartcard.scard import (
SCARD_E_NOT_TRANSACTED,
SCARD_E_INVALID_PARAMETER,
SCARD_ATTR_CHANNEL_ID,
SCARD_SHARE_DIRECT,
SCARD_LEAVE_CARD,
)
from smartcard.util import toASCIIString
def get_usb_path(reader):
"""
Display USB topology
"""
print("Using:", reader)
card_connection = reader.createConnection()
card_connection.connect(mode=SCARD_SHARE_DIRECT, disposition=SCARD_LEAVE_CARD)
# special control code
ioctl_get_usb_path = SCARD_CTL_CODE(3601)
try:
res = card_connection.control(ioctl_get_usb_path)
except smartcard.Exceptions.SmartcardException as ex:
# SCARD_E_NOT_TRANSACTED returned by pcsc-lite
# SCARD_E_INVALID_PARAMETER retruned by macOS
if ex.hresult in [SCARD_E_NOT_TRANSACTED, SCARD_E_INVALID_PARAMETER]:
print("Your driver does not (yet) support SCARD_CTL_CODE(3601)")
return
raise
print("USB path:", toASCIIString(res))
# get Channel ID
attrib = card_connection.getAttrib(SCARD_ATTR_CHANNEL_ID)
ddddcccc = struct.unpack("i", bytearray(attrib))[0]
dddd = ddddcccc >> 16
if dddd == 0x0020:
bus = (ddddcccc & 0xFF00) >> 8
addr = ddddcccc & 0xFF
print(f" USB: bus: {bus}, addr: {addr}")
print()
def main():
"""
main
"""
# for all the available readers
for reader in smartcard.System.readers():
get_usb_path(reader)
if __name__ == "__main__":
main()
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