SCardGetAttrib: add test for SCARD_ATTR_CHANNEL_ID

UnitaryTests/SCardGetAttrib.py

@@ -25,6 +25,7 @@
 from smartcard.scard import *
 from smartcard.pcsc.PCSCExceptions import *
 from smartcard.util import toHexString, toASCIIString
+from struct import unpack
 
 hresult, hcontext = SCardEstablishContext(SCARD_SCOPE_USER)
 if hresult != SCARD_S_SUCCESS:
@@ -42,13 +43,23 @@
  raise BaseSCardException(hresult)
 
  print("reader:", reader)
- for attribute in (SCARD_ATTR_VENDOR_IFD_SERIAL_NO, SCARD_ATTR_ATR_STRING):
+ for attribute in (SCARD_ATTR_VENDOR_IFD_SERIAL_NO,
+ SCARD_ATTR_ATR_STRING, SCARD_ATTR_CHANNEL_ID):
  hresult, attrib = SCardGetAttrib(hcard, attribute)
  print(hex(attribute), end=' ')
  if hresult != SCARD_S_SUCCESS:
  print(SCardGetErrorMessage(hresult))
  else:
  print(attrib, toHexString(attrib), toASCIIString(attrib))
+ if attribute is SCARD_ATTR_CHANNEL_ID:
+ # get the DWORD value
+ DDDDCCCC = unpack("i", bytearray(attrib))[0]
+ DDDD = DDDDCCCC >> 16
+ if DDDD is 0x0020:
+ bus = (DDDDCCCC & 0xFF00) >> 8
+ addr = DDDDCCCC & 0xFF
+ print(" USB: bus: {}, addr: {}".format(bus, addr))
+
 
  hresult = SCardDisconnect(hcard, SCARD_LEAVE_CARD)
  if hresult != SCARD_S_SUCCESS: