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53

answers:

2

Folks, I'm working on a certificate authentication app that will authenticate user based on CAC inserted. How do I know when the CAC is inserted / removed? I'll be "catching" that event in C++ or Java. Thanks.

A: 

You might see if it is reported through udev.

caf
And if not, it probably could be.
Tim Post
As a smart card will not show up as a device, why should it be reported via udev? Smart card readers (or USB tokens) that actually connect to a USB port are reported via udev but not smart cards (AFAIK)
martin
+1  A: 

You have two options:

  1. If you go for "low level" (which you apparently want to do) is to use PC/SC level (pcsc-lite) and the SCardGetStatusChange function (or the equivalent in Java, what is javax.smartcardio.CardTerminal.waitForCardPresent())
  2. If you're working with higher level abstractions and go for PKCS#11 (and if your PKCS#11 provider implements it correctly), C_WaitForSlotEvent can be used.
martin