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scd: ccid-driver: Initial getting ATR more robustly.

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* scd/ccid-driver.c (send_power_off): New.
(do_close_reader): Use send_power_off.
(ccid_get_atr): Add error recovery.

GnuPG-bug-id: 4616
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2019-07-09 10:56:09 +09:00
parent 39c40e572c
commit c51a568555
1 changed files with 39 additions and 18 deletions
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57
scd/ccid-driver.c
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@ -1717,31 +1717,37 @@ ccid_require_get_status (ccid_driver_t handle)
return 1;
}
static void
do_close_reader (ccid_driver_t handle)
static int
send_power_off (ccid_driver_t handle)
{
int rc;
unsigned char msg[100];
size_t msglen;
unsigned char seqno;
if (!handle->powered_off)
{
msg[0] = PC_to_RDR_IccPowerOff;
msg[5] = 0; /* slot */
msg[6] = seqno = handle->seqno++;
msg[7] = 0; /* RFU */
msg[8] = 0; /* RFU */
msg[9] = 0; /* RFU */
set_msg_len (msg, 0);
msglen = 10;
msg[0] = PC_to_RDR_IccPowerOff;
msg[5] = 0; /* slot */
msg[6] = seqno = handle->seqno++;
msg[7] = 0; /* RFU */
msg[8] = 0; /* RFU */
msg[9] = 0; /* RFU */
set_msg_len (msg, 0);
msglen = 10;
rc = bulk_out (handle, msg, msglen, 0);
if (!rc)
bulk_in (handle, msg, sizeof msg, &msglen, RDR_to_PC_SlotStatus,
seqno, 2000, 0);
}
rc = bulk_out (handle, msg, msglen, 0);
if (!rc)
bulk_in (handle, msg, sizeof msg, &msglen, RDR_to_PC_SlotStatus,
seqno, 2000, 0);
return rc;
}
static void
do_close_reader (ccid_driver_t handle)
{
int rc;
if (!handle->powered_off)
send_power_off (handle);
if (handle->transfer)
{
@ -2597,6 +2603,21 @@ ccid_get_atr (ccid_driver_t handle,
NULL, 0, NULL))
goto again;
}
else if (statusbits == 0 && CCID_COMMAND_FAILED (msg))
{
/* Card was active already, and something went wrong with
PC_to_RDR_IccPowerOn command. It may be baud-rate mismatch
between the card and the reader. To recover from this state,
send PC_to_RDR_IccPowerOff command to reset the card and try
again.
*/
rc = send_power_off (handle);
if (rc)
return rc;
statusbits = 1;
goto again;
}
else if (CCID_COMMAND_FAILED (msg))
return CCID_DRIVER_ERR_CARD_IO_ERROR;