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scd/app.c

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	}	}


		/*
		* Check external interference before each use of the application on
		* card. Returns -1 when detecting some external interference.
		* Returns 0 if not.
		*
		* Note: This kind of detection can't be perfect. At most, it may be
		* possibly useful kludge, in some limited situations.
		*/
		static int
		check_external_interference (app_t app, ctrl_t ctrl)
		{
		/*
		* Only when a user is using Yubikey with pcsc-shared configuration,
		* we need this detection. Otherwise, the card/token is under full
		* control of scdaemon, there's no problem at all.
		*/
		if (!opt.pcsc_shared)
		return 0;

		if (app->fnc.check_aid)
		{
		unsigned char *aid;
		size_t aidlen;
		gpg_error_t err;
		int slot = app_get_slot (app);

		err = iso7816_get_data (slot, 0, 0x004F, &aid, &aidlen);
		if (err)
		return -1;

		err = app->fnc.check_aid (app, ctrl, aid, aidlen);
		xfree (aid);
		if (err)
		return -1;
		}

		return 0;
		}

	/* Check that the card has been initialized and whether we need to	/* Check that the card has been initialized and whether we need to
	* switch to another application on the same card. Switching means	* switch to another application on the same card. Switching means
	* that the new active app will be moved to the head of the list at	* that the new active app will be moved to the head of the list at
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	ctrl->current_apptype = card->app->apptype;	ctrl->current_apptype = card->app->apptype;
	return 0;	return 0;
	}	}

		/* This validate for interference before to be able to swith beteween
		apps on the card. If it not possible to reselect the current apps
		on card it's a bad card */
		if (check_external_interference (card->app, ctrl) != 0)
		{
		err = run_reselect (ctrl, card, card->app, card->app);
		if (!err)
		return err;
		}

	for (app = card->app; app; app = app->next)	for (app = card->app; app; app = app->next)
	if (app->apptype == ctrl->current_apptype)	if (app->apptype == ctrl->current_apptype)
	break;	break;
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