bankd: Implement card reset based on clientSlotStatusInd

If a client is sending us a clientSlotStatusInd indicating that
the modem has switched off VCC or activated RST, bankd will
now issue a respective PC/SC command to perform a cold or warm
reset of the card.

Change-Id: Ifa615d239ec3ad6daebd8e99e4f7d5b99d32c0e1
Closes: OS#4330

src/bankd/bankd.h

@@ -102,6 +102,8 @@ struct bankd_worker {
 struct bankd_driver_ops {
 	/* open a given card/slot: called once client + mapping exists */
 	int (*open_card)(struct bankd_worker *worker);
+	/* reset a given card/slot with either cold or warm reset */
+	int (*reset_card)(struct bankd_worker *worker, bool cold_reset);
 	int (*transceive)(struct bankd_worker *worker, const uint8_t *out, size_t out_len,
 			  uint8_t *in, size_t *in_len);
 	/* called at cleanup time of a worker thread: clear any driver related state */

src/bankd/bankd_main.c

@@ -727,6 +727,26 @@ static int worker_handle_tpduModemToCard(struct bankd_worker *worker, const Rspr
 	return 0;
 }
 
+static int worker_handle_clientSlotStatusInd(struct bankd_worker *worker, const RsproPDU_t *pdu)
+{
+	const struct ClientSlotStatusInd *cssi = &pdu->msg.choice.clientSlotStatusInd;
+	const struct SlotPhysStatus *sps = &cssi->slotPhysStatus;
+	int rc = 0;
+
+	LOGW(worker, "clientSlotStatusInd(RST=%s, VCC=%s, CLK=%s)\n",
+		sps->resetActive ? "ACTIVE" : "INACTIVE",
+		sps->vccPresent ? *sps->vccPresent ? "PRESENT" : "ABSENT" : "NULL",
+		sps->clkActive ? *sps->clkActive ? "ACTIVE" : "INACTIVE" : "NULL");
+
+	/* perform cold or warm reset */
+	if (sps->vccPresent && *sps->vccPresent == 0)
+		rc = worker->ops->reset_card(worker, true);
+	else if (sps->resetActive)
+		rc = worker->ops->reset_card(worker, false);
+
+	return rc;
+}
+
 /* handle one incoming RSPRO message from a client inside a worker thread */
 static int worker_handle_rspro(struct bankd_worker *worker, const RsproPDU_t *pdu)
 {
@@ -742,7 +762,7 @@ static int worker_handle_rspro(struct bankd_worker *worker, const RsproPDU_t *pd
 		rc = worker_handle_tpduModemToCard(worker, pdu);
 		break;
 	case RsproPDUchoice_PR_clientSlotStatusInd:
-		/* FIXME */
+		rc = worker_handle_clientSlotStatusInd(worker, pdu);
 		rc = 0;
 		break;
 	case RsproPDUchoice_PR_setAtrRes:

src/bankd/bankd_pcsc.c

@@ -152,6 +152,24 @@ if (rv != SCARD_S_SUCCESS) { \
         LOGW((w), ": OK\n"); \
 }
 
+static int pcsc_get_atr(struct bankd_worker *worker)
+{
+	long rc;
+	char pbReader[MAX_READERNAME];
+	/* use DWORD type as this is what the PC/SC API expects */
+	DWORD dwReaderLen = sizeof(pbReader);
+	DWORD dwAtrLen = worker->card.atr_len = sizeof(worker->card.atr);
+	DWORD dwState, dwProt;
+
+	rc = SCardStatus(worker->reader.pcsc.hCard, pbReader, &dwReaderLen, &dwState, &dwProt,
+			 worker->card.atr, &dwAtrLen);
+	PCSC_ERROR(worker, rc, "SCardStatus")
+	worker->card.atr_len = dwAtrLen;
+	LOGW(worker, "Card ATR: %s\n", osmo_hexdump_nospc(worker->card.atr, worker->card.atr_len));
+end:
+	return rc;
+}
+
 static int pcsc_open_card(struct bankd_worker *worker)
 {
 	long rc;
@@ -171,16 +189,23 @@ static int pcsc_open_card(struct bankd_worker *worker)
 		PCSC_ERROR(worker, rc, "SCardConnect")
 	}
 
-	/* use DWORD type as this is what the PC/SC API expects */
-	char pbReader[MAX_READERNAME];
-	DWORD dwReaderLen = sizeof(pbReader);
-	DWORD dwAtrLen = worker->card.atr_len = sizeof(worker->card.atr);
-	DWORD dwState, dwProt;
-	rc = SCardStatus(worker->reader.pcsc.hCard, pbReader, &dwReaderLen, &dwState, &dwProt,
-			 worker->card.atr, &dwAtrLen);
-	PCSC_ERROR(worker, rc, "SCardStatus")
-	worker->card.atr_len = dwAtrLen;
-	LOGW(worker, "Card ATR: %s\n", osmo_hexdump_nospc(worker->card.atr, worker->card.atr_len));
+	rc = pcsc_get_atr(worker);
+end:
+	return rc;
+}
+
+static int pcsc_reset_card(struct bankd_worker *worker, bool cold_reset)
+{
+	long rc;
+	DWORD dwActiveProtocol;
+
+	LOGW(worker, "Resetting card in '%s' (%s)\n", worker->reader.name,
+		cold_reset ? "cold reset" : "warm reset");
+	rc = SCardReconnect(worker->reader.pcsc.hCard, SCARD_SHARE_SHARED, SCARD_PROTOCOL_T0,
+			    cold_reset ? SCARD_UNPOWER_CARD : SCARD_RESET_CARD, &dwActiveProtocol);
+	PCSC_ERROR(worker, rc, "SCardReconnect");
+
+	rc = pcsc_get_atr(worker);
 end:
 	return rc;
 }
@@ -213,6 +238,7 @@ static void pcsc_cleanup(struct bankd_worker *worker)
 
 const struct bankd_driver_ops pcsc_driver_ops = {
 	.open_card = pcsc_open_card,
+	.reset_card = pcsc_reset_card,
 	.transceive = pcsc_transceive,
 	.cleanup = pcsc_cleanup,
 };