[Smartsign-users] JC-Emulator crashes if unable to select the applet

[Brigo R. <ro...@ss...>]

I'm using the JC-Emulator to test some changes to the 
CardEdge applet, and I've discovered what I think to be an 
"unfair" behaviour of the emulator.
After having installed my applet into the emulator using 
installer.sh I was using muscleTool to format it, but 
everytime I tried, the emulator hanged up reporting an 
uncatched exception.
After a quite long debugging, I found that the problem was 
in the JCManager::run() method. Here are the lines I refer 
to:

------------------------------------

   if(theJCRECore.getSelectedAID()==null) {
     System.out.println("JCManager: fallimento selezione 
AID applet");
     // se nessuna applet è selezionata
     ISOException.throwIt(ISO7816.SW_APPLET_SELECT_FAILED);
   }

---------------------------------

As you can see the emulator correctly verifies if the 
applet  has been successfully selected, otherwise throws 
the exception ISO7816.SW_APPLET_SELECT_FAILED. The problem 
is that this exception isn't caught by anybody, causing 
the emulator to crash without sending any error response 
to the user application, and causing also the pcscd daemon 
to lock in an apparently irreversible way (the 
start-stop-daemon seems not to work: the only solution is 
to manually "kill" the pcscd process).
I don't know exactly the internal architecture of the 
emulator, so I'm not able, by now, to realize by myself 
the proper patch, but the core of the problem seems quite 
clear: the emulator should not throw such an uncatched 
exception, but it should return to the application the 
correct error-code without hanging-up (even a generic 
"internal error" would be much better than a complete 
lock).

Hoping my report can be of any help, best regards.

Riccardo Brigo