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/*! \file reader_pcsc.c
* PC/SC Card reader backend for libosmosim. */
/*
* (C) 2012 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* SPDX-License-Identifier: GPL-2.0+
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <string.h>
#include <stdint.h>
#include <stdio.h>
#include <errno.h>
#include <osmocom/core/talloc.h>
#include <osmocom/sim/sim.h>
#include <wintypes.h>
#include <winscard.h>
#include "sim_int.h"
#define PCSC_ERROR(rv, text) \
if (rv != SCARD_S_SUCCESS) { \
fprintf(stderr, text ": %s (0x%lX)\n", pcsc_stringify_error(rv), rv); \
goto end; \
}
struct pcsc_reader_state {
SCARDCONTEXT hContext;
SCARDHANDLE hCard;
DWORD dwActiveProtocol;
const SCARD_IO_REQUEST *pioSendPci;
SCARD_IO_REQUEST pioRecvPci;
char *name;
};
static int pcsc_get_atr(struct osim_card_hdl *card)
{
struct osim_reader_hdl *rh = card->reader;
struct pcsc_reader_state *st = rh->priv;
char pbReader[MAX_READERNAME];
DWORD dwReaderLen = sizeof(pbReader);
DWORD dwAtrLen = sizeof(card->atr);
DWORD dwState, dwProt;
long rc;
rc = SCardStatus(st->hCard, pbReader, &dwReaderLen, &dwState, &dwProt,
card->atr, &dwAtrLen);
PCSC_ERROR(rc, "SCardStatus");
card->atr_len = dwAtrLen;
return 0;
end:
return -EIO;
}
static struct osim_reader_hdl *pcsc_reader_open(int num, const char *id, void *ctx)
{
struct osim_reader_hdl *rh;
struct pcsc_reader_state *st;
LONG rc;
LPSTR mszReaders = NULL;
DWORD dwReaders;
unsigned int num_readers;
char *ptr;
/* FIXME: implement matching on id or num */
rh = talloc_zero(ctx, struct osim_reader_hdl);
st = rh->priv = talloc_zero(rh, struct pcsc_reader_state);
rc = SCardEstablishContext(SCARD_SCOPE_SYSTEM, NULL, NULL,
&st->hContext);
PCSC_ERROR(rc, "SCardEstablishContext");
dwReaders = SCARD_AUTOALLOCATE;
rc = SCardListReaders(st->hContext, NULL, (LPSTR)&mszReaders, &dwReaders);
PCSC_ERROR(rc, "SCardListReaders");
/* SCARD_S_SUCCESS means there is at least one reader in the group */
num_readers = 0;
ptr = mszReaders;
while (*ptr != '\0' && num_readers != num) {
ptr += strlen(ptr)+1;
num_readers++;
}
if (num != num_readers) {
SCardFreeMemory(st->hContext, mszReaders);
goto end;
}
st->name = talloc_strdup(rh, ptr);
st->dwActiveProtocol = -1;
SCardFreeMemory(st->hContext, mszReaders);
return rh;
end:
talloc_free(rh);
return NULL;
}
static struct osim_card_hdl *pcsc_card_open(struct osim_reader_hdl *rh,
enum osim_proto proto)
{
struct pcsc_reader_state *st = rh->priv;
struct osim_card_hdl *card;
struct osim_chan_hdl *chan;
LONG rc;
if (proto != OSIM_PROTO_T0)
return NULL;
rc = SCardConnect(st->hContext, st->name, SCARD_SHARE_SHARED,
SCARD_PROTOCOL_T0, &st->hCard, &st->dwActiveProtocol);
PCSC_ERROR(rc, "SCardConnect");
st->pioSendPci = SCARD_PCI_T0;
card = talloc_zero(rh, struct osim_card_hdl);
INIT_LLIST_HEAD(&card->channels);
INIT_LLIST_HEAD(&card->apps);
card->reader = rh;
rh->card = card;
/* create a default channel */
chan = talloc_zero(card, struct osim_chan_hdl);
chan->card = card;
llist_add(&chan->list, &card->channels);
pcsc_get_atr(card);
return card;
end:
return NULL;
}
static int pcsc_card_reset(struct osim_card_hdl *card, bool cold_reset)
{
struct pcsc_reader_state *st = card->reader->priv;
LONG rc;
rc = SCardReconnect(st->hCard, SCARD_SHARE_SHARED, SCARD_PROTOCOL_T0,
cold_reset ? SCARD_UNPOWER_CARD : SCARD_RESET_CARD,
&st->dwActiveProtocol);
PCSC_ERROR(rc, "SCardReconnect");
return 0;
end:
return -EIO;
}
static int pcsc_card_close(struct osim_card_hdl *card)
{
struct pcsc_reader_state *st = card->reader->priv;
LONG rc;
rc = SCardDisconnect(st->hCard, SCARD_UNPOWER_CARD);
PCSC_ERROR(rc, "SCardDisconnect");
return 0;
end:
return -EIO;
}
static int pcsc_transceive(struct osim_reader_hdl *rh, struct msgb *msg)
{
struct pcsc_reader_state *st = rh->priv;
DWORD rlen = msgb_tailroom(msg);
LONG rc;
rc = SCardTransmit(st->hCard, st->pioSendPci, msg->data, msgb_length(msg),
&st->pioRecvPci, msg->tail, &rlen);
PCSC_ERROR(rc, "SCardEndTransaction");
msgb_put(msg, rlen);
msgb_apdu_le(msg) = rlen;
return 0;
end:
return -EIO;
}
const struct osim_reader_ops pcsc_reader_ops = {
.name = "PC/SC",
.reader_open = pcsc_reader_open,
.card_open = pcsc_card_open,
.card_reset = pcsc_card_reset,
.card_close = pcsc_card_close,
.transceive = pcsc_transceive,
};
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