[qemu.git] / hw / usb / ccid-card-passthru.c

/*
 * CCID Passthru Card Device emulation
 *
 * Copyright (c) 2011 Red Hat.
 * Written by Alon Levy.
 *
 * This work is licensed under the terms of the GNU GPL, version 2.1 or later.
 * See the COPYING file in the top-level directory.
 */

#include "qemu/osdep.h"
#include "chardev/char-fe.h"
#include "qemu/error-report.h"
#include "qemu/sockets.h"
#include "ccid.h"
#include "cacard/vscard_common.h"

#define DPRINTF(card, lvl, fmt, ...)                    \
do {                                                    \
    if (lvl <= card->debug) {                           \
        printf("ccid-card-passthru: " fmt , ## __VA_ARGS__);     \
    }                                                   \
} while (0)

#define D_WARN 1
#define D_INFO 2
#define D_MORE_INFO 3
#define D_VERBOSE 4

/* TODO: do we still need this? */
static const uint8_t DEFAULT_ATR[] = {
/*
 * From some example somewhere
 * 0x3B, 0xB0, 0x18, 0x00, 0xD1, 0x81, 0x05, 0xB1, 0x40, 0x38, 0x1F, 0x03, 0x28
 */

/* From an Athena smart card */
 0x3B, 0xD5, 0x18, 0xFF, 0x80, 0x91, 0xFE, 0x1F, 0xC3, 0x80, 0x73, 0xC8, 0x21,
 0x13, 0x08
};

#define VSCARD_IN_SIZE 65536

/* maximum size of ATR - from 7816-3 */
#define MAX_ATR_SIZE        40

typedef struct PassthruState PassthruState;

struct PassthruState {
    CCIDCardState base;
    CharBackend cs;
    uint8_t  vscard_in_data[VSCARD_IN_SIZE];
    uint32_t vscard_in_pos;
    uint32_t vscard_in_hdr;
    uint8_t  atr[MAX_ATR_SIZE];
    uint8_t  atr_length;
    uint8_t  debug;
};

#define TYPE_CCID_PASSTHRU "ccid-card-passthru"
#define PASSTHRU_CCID_CARD(obj) \
    OBJECT_CHECK(PassthruState, (obj), TYPE_CCID_PASSTHRU)

/*
 * VSCard protocol over chardev
 * This code should not depend on the card type.
 */

static void ccid_card_vscard_send_msg(PassthruState *s,
        VSCMsgType type, uint32_t reader_id,
        const uint8_t *payload, uint32_t length)
{
    VSCMsgHeader scr_msg_header;

    scr_msg_header.type = htonl(type);
    scr_msg_header.reader_id = htonl(reader_id);
    scr_msg_header.length = htonl(length);
    /* XXX this blocks entire thread. Rewrite to use
     * qemu_chr_fe_write and background I/O callbacks */
    qemu_chr_fe_write_all(&s->cs, (uint8_t *)&scr_msg_header,
                          sizeof(VSCMsgHeader));
    qemu_chr_fe_write_all(&s->cs, payload, length);
}

static void ccid_card_vscard_send_apdu(PassthruState *s,
    const uint8_t *apdu, uint32_t length)
{
    ccid_card_vscard_send_msg(
        s, VSC_APDU, VSCARD_MINIMAL_READER_ID, apdu, length);
}

static void ccid_card_vscard_send_error(PassthruState *s,
                    uint32_t reader_id, VSCErrorCode code)
{
    VSCMsgError msg = {.code = htonl(code)};

    ccid_card_vscard_send_msg(
        s, VSC_Error, reader_id, (uint8_t *)&msg, sizeof(msg));
}

static void ccid_card_vscard_send_init(PassthruState *s)
{
    VSCMsgInit msg = {
        .version = htonl(VSCARD_VERSION),
        .magic = VSCARD_MAGIC,
        .capabilities = {0}
    };

    ccid_card_vscard_send_msg(s, VSC_Init, VSCARD_UNDEFINED_READER_ID,
                         (uint8_t *)&msg, sizeof(msg));
}

static int ccid_card_vscard_can_read(void *opaque)
{
    PassthruState *card = opaque;

    return VSCARD_IN_SIZE >= card->vscard_in_pos ?
           VSCARD_IN_SIZE - card->vscard_in_pos : 0;
}

static void ccid_card_vscard_handle_init(
    PassthruState *card, VSCMsgHeader *hdr, VSCMsgInit *init)
{
    uint32_t *capabilities;
    int num_capabilities;
    int i;

    capabilities = init->capabilities;
    num_capabilities =
        1 + ((hdr->length - sizeof(VSCMsgInit)) / sizeof(uint32_t));
    init->version = ntohl(init->version);
    for (i = 0 ; i < num_capabilities; ++i) {
        capabilities[i] = ntohl(capabilities[i]);
    }
    if (init->magic != VSCARD_MAGIC) {
        error_report("wrong magic");
        /* we can't disconnect the chardev */
    }
    if (init->version != VSCARD_VERSION) {
        DPRINTF(card, D_WARN,
            "got version %d, have %d", init->version, VSCARD_VERSION);
    }
    /* future handling of capabilities, none exist atm */
    ccid_card_vscard_send_init(card);
}

static int check_atr(PassthruState *card, uint8_t *data, int len)
{
    int historical_length, opt_bytes;
    int td_count = 0;
    int td;

    if (len < 2) {
        return 0;
    }
    historical_length = data[1] & 0xf;
    opt_bytes = 0;
    if (data[0] != 0x3b && data[0] != 0x3f) {
        DPRINTF(card, D_WARN, "atr's T0 is 0x%X, not in {0x3b, 0x3f}\n",
                data[0]);
        return 0;
    }
    td_count = 0;
    td = data[1] >> 4;
    while (td && td_count < 2 && opt_bytes + historical_length + 2 < len) {
        td_count++;
        if (td & 0x1) {
            opt_bytes++;
        }
        if (td & 0x2) {
            opt_bytes++;
        }
        if (td & 0x4) {
            opt_bytes++;
        }
        if (td & 0x8) {
            opt_bytes++;
            td = data[opt_bytes + 2] >> 4;
        }
    }
    if (len < 2 + historical_length + opt_bytes) {
        DPRINTF(card, D_WARN,
            "atr too short: len %d, but historical_len %d, T1 0x%X\n",
            len, historical_length, data[1]);
        return 0;
    }
    if (len > 2 + historical_length + opt_bytes) {
        DPRINTF(card, D_WARN,
            "atr too long: len %d, but hist/opt %d/%d, T1 0x%X\n",
            len, historical_length, opt_bytes, data[1]);
        /* let it through */
    }
    DPRINTF(card, D_VERBOSE,
            "atr passes check: %d total length, %d historical, %d optional\n",
            len, historical_length, opt_bytes);

    return 1;
}

static void ccid_card_vscard_handle_message(PassthruState *card,
    VSCMsgHeader *scr_msg_header)
{
    uint8_t *data = (uint8_t *)&scr_msg_header[1];

    switch (scr_msg_header->type) {
    case VSC_ATR:
        DPRINTF(card, D_INFO, "VSC_ATR %d\n", scr_msg_header->length);
        if (scr_msg_header->length > MAX_ATR_SIZE) {
            error_report("ATR size exceeds spec, ignoring");
            ccid_card_vscard_send_error(card, scr_msg_header->reader_id,
                                        VSC_GENERAL_ERROR);
            break;
        }
        if (!check_atr(card, data, scr_msg_header->length)) {
            error_report("ATR is inconsistent, ignoring");
            ccid_card_vscard_send_error(card, scr_msg_header->reader_id,
                                        VSC_GENERAL_ERROR);
            break;
        }
        memcpy(card->atr, data, scr_msg_header->length);
        card->atr_length = scr_msg_header->length;
        ccid_card_card_inserted(&card->base);
        ccid_card_vscard_send_error(card, scr_msg_header->reader_id,
                                    VSC_SUCCESS);
        break;
    case VSC_APDU:
        ccid_card_send_apdu_to_guest(
            &card->base, data, scr_msg_header->length);
        break;
    case VSC_CardRemove:
        DPRINTF(card, D_INFO, "VSC_CardRemove\n");
        ccid_card_card_removed(&card->base);
        ccid_card_vscard_send_error(card,
            scr_msg_header->reader_id, VSC_SUCCESS);
        break;
    case VSC_Init:
        ccid_card_vscard_handle_init(
            card, scr_msg_header, (VSCMsgInit *)data);
        break;
    case VSC_Error:
        ccid_card_card_error(&card->base, *(uint32_t *)data);
        break;
    case VSC_ReaderAdd:
        if (ccid_card_ccid_attach(&card->base) < 0) {
            ccid_card_vscard_send_error(card, VSCARD_UNDEFINED_READER_ID,
                                      VSC_CANNOT_ADD_MORE_READERS);
        } else {
            ccid_card_vscard_send_error(card, VSCARD_MINIMAL_READER_ID,
                                        VSC_SUCCESS);
        }
        break;
    case VSC_ReaderRemove:
        ccid_card_ccid_detach(&card->base);
        ccid_card_vscard_send_error(card,
            scr_msg_header->reader_id, VSC_SUCCESS);
        break;
    default:
        printf("usb-ccid: chardev: unexpected message of type %X\n",
               scr_msg_header->type);
        ccid_card_vscard_send_error(card, scr_msg_header->reader_id,
            VSC_GENERAL_ERROR);
    }
}

static void ccid_card_vscard_drop_connection(PassthruState *card)
{
    qemu_chr_fe_deinit(&card->cs, true);
    card->vscard_in_pos = card->vscard_in_hdr = 0;
}

static void ccid_card_vscard_read(void *opaque, const uint8_t *buf, int size)
{
    PassthruState *card = opaque;
    VSCMsgHeader *hdr;

    if (card->vscard_in_pos + size > VSCARD_IN_SIZE) {
        error_report(
            "no room for data: pos %d +  size %d > %d. dropping connection.",
            card->vscard_in_pos, size, VSCARD_IN_SIZE);
        ccid_card_vscard_drop_connection(card);
        return;
    }
    assert(card->vscard_in_pos < VSCARD_IN_SIZE);
    assert(card->vscard_in_hdr < VSCARD_IN_SIZE);
    memcpy(card->vscard_in_data + card->vscard_in_pos, buf, size);
    card->vscard_in_pos += size;
    hdr = (VSCMsgHeader *)(card->vscard_in_data + card->vscard_in_hdr);

    while ((card->vscard_in_pos - card->vscard_in_hdr >= sizeof(VSCMsgHeader))
         &&(card->vscard_in_pos - card->vscard_in_hdr >=
                                  sizeof(VSCMsgHeader) + ntohl(hdr->length))) {
        hdr->reader_id = ntohl(hdr->reader_id);
        hdr->length = ntohl(hdr->length);
        hdr->type = ntohl(hdr->type);
        ccid_card_vscard_handle_message(card, hdr);
        card->vscard_in_hdr += hdr->length + sizeof(VSCMsgHeader);
        hdr = (VSCMsgHeader *)(card->vscard_in_data + card->vscard_in_hdr);
    }
    if (card->vscard_in_hdr == card->vscard_in_pos) {
        card->vscard_in_pos = card->vscard_in_hdr = 0;
    }
}

static void ccid_card_vscard_event(void *opaque, int event)
{
    PassthruState *card = opaque;

    switch (event) {
    case CHR_EVENT_BREAK:
        card->vscard_in_pos = card->vscard_in_hdr = 0;
        break;
    case CHR_EVENT_OPENED:
        DPRINTF(card, D_INFO, "%s: CHR_EVENT_OPENED\n", __func__);
        break;
    }
}

/* End VSCard handling */

static void passthru_apdu_from_guest(
    CCIDCardState *base, const uint8_t *apdu, uint32_t len)
{
    PassthruState *card = PASSTHRU_CCID_CARD(base);

    if (!qemu_chr_fe_backend_connected(&card->cs)) {
        printf("ccid-passthru: no chardev, discarding apdu length %d\n", len);
        return;
    }
    ccid_card_vscard_send_apdu(card, apdu, len);
}

static const uint8_t *passthru_get_atr(CCIDCardState *base, uint32_t *len)
{
    PassthruState *card = PASSTHRU_CCID_CARD(base);

    *len = card->atr_length;
    return card->atr;
}

static int passthru_initfn(CCIDCardState *base)
{
    PassthruState *card = PASSTHRU_CCID_CARD(base);

    card->vscard_in_pos = 0;
    card->vscard_in_hdr = 0;
    if (qemu_chr_fe_backend_connected(&card->cs)) {
        DPRINTF(card, D_INFO, "initing chardev\n");
        qemu_chr_fe_set_handlers(&card->cs,
            ccid_card_vscard_can_read,
            ccid_card_vscard_read,
            ccid_card_vscard_event, NULL, card, NULL, true);
        ccid_card_vscard_send_init(card);
    } else {
        error_report("missing chardev");
        return -1;
    }
    card->debug = parse_debug_env("QEMU_CCID_PASSTHRU_DEBUG", D_VERBOSE,
                                  card->debug);
    assert(sizeof(DEFAULT_ATR) <= MAX_ATR_SIZE);
    memcpy(card->atr, DEFAULT_ATR, sizeof(DEFAULT_ATR));
    card->atr_length = sizeof(DEFAULT_ATR);
    return 0;
}

static VMStateDescription passthru_vmstate = {
    .name = "ccid-card-passthru",
    .version_id = 1,
    .minimum_version_id = 1,
    .fields = (VMStateField[]) {
        VMSTATE_BUFFER(vscard_in_data, PassthruState),
        VMSTATE_UINT32(vscard_in_pos, PassthruState),
        VMSTATE_UINT32(vscard_in_hdr, PassthruState),
        VMSTATE_BUFFER(atr, PassthruState),
        VMSTATE_UINT8(atr_length, PassthruState),
        VMSTATE_END_OF_LIST()
    }
};

static Property passthru_card_properties[] = {
    DEFINE_PROP_CHR("chardev", PassthruState, cs),
    DEFINE_PROP_UINT8("debug", PassthruState, debug, 0),
    DEFINE_PROP_END_OF_LIST(),
};

static void passthru_class_initfn(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    CCIDCardClass *cc = CCID_CARD_CLASS(klass);

    cc->initfn = passthru_initfn;
    cc->get_atr = passthru_get_atr;
    cc->apdu_from_guest = passthru_apdu_from_guest;
    set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
    dc->desc = "passthrough smartcard";
    dc->vmsd = &passthru_vmstate;
    dc->props = passthru_card_properties;
}

static const TypeInfo passthru_card_info = {
    .name          = TYPE_CCID_PASSTHRU,
    .parent        = TYPE_CCID_CARD,
    .instance_size = sizeof(PassthruState),
    .class_init    = passthru_class_initfn,
};

static void ccid_card_passthru_register_types(void)
{
    type_register_static(&passthru_card_info);
}

type_init(ccid_card_passthru_register_types)
Commit	Line	Data
edbb2136 AL	1	/*
	2	* CCID Passthru Card Device emulation
	3	*
	4	* Copyright (c) 2011 Red Hat.
	5	* Written by Alon Levy.
	6	*
	7	* This work is licensed under the terms of the GNU GPL, version 2.1 or later.
	8	* See the COPYING file in the top-level directory.
	9	*/
	10
e532b2e0	11	#include "qemu/osdep.h"
4d43a603	12	#include "chardev/char-fe.h"
d49b6836	13	#include "qemu/error-report.h"
1de7afc9	14	#include "qemu/sockets.h"
47b43a1f	15	#include "ccid.h"
7b02f544	16	#include "cacard/vscard_common.h"
edbb2136 AL	17
	18	#define DPRINTF(card, lvl, fmt, ...) \
	19	do { \
	20	if (lvl <= card->debug) { \
	21	printf("ccid-card-passthru: " fmt , ## __VA_ARGS__); \
	22	} \
	23	} while (0)
	24
	25	#define D_WARN 1
	26	#define D_INFO 2
	27	#define D_MORE_INFO 3
	28	#define D_VERBOSE 4
	29
	30	/* TODO: do we still need this? */
da000a48	31	static const uint8_t DEFAULT_ATR[] = {
edbb2136 AL	32	/*
	33	* From some example somewhere
	34	* 0x3B, 0xB0, 0x18, 0x00, 0xD1, 0x81, 0x05, 0xB1, 0x40, 0x38, 0x1F, 0x03, 0x28
	35	*/
	36
	37	/* From an Athena smart card */
	38	0x3B, 0xD5, 0x18, 0xFF, 0x80, 0x91, 0xFE, 0x1F, 0xC3, 0x80, 0x73, 0xC8, 0x21,
	39	0x13, 0x08
	40	};
	41
edbb2136 AL	42	#define VSCARD_IN_SIZE 65536
	43
	44	/* maximum size of ATR - from 7816-3 */
	45	#define MAX_ATR_SIZE 40
	46
	47	typedef struct PassthruState PassthruState;
	48
	49	struct PassthruState {
	50	CCIDCardState base;
becdfa00	51	CharBackend cs;
edbb2136 AL	52	uint8_t vscard_in_data[VSCARD_IN_SIZE];
	53	uint32_t vscard_in_pos;
	54	uint32_t vscard_in_hdr;
	55	uint8_t atr[MAX_ATR_SIZE];
	56	uint8_t atr_length;
	57	uint8_t debug;
	58	};
	59
059db204 C	60	#define TYPE_CCID_PASSTHRU "ccid-card-passthru"
	61	#define PASSTHRU_CCID_CARD(obj) \
	62	OBJECT_CHECK(PassthruState, (obj), TYPE_CCID_PASSTHRU)
	63
edbb2136 AL	64	/*
	65	* VSCard protocol over chardev
	66	* This code should not depend on the card type.
	67	*/
	68
	69	static void ccid_card_vscard_send_msg(PassthruState *s,
	70	VSCMsgType type, uint32_t reader_id,
	71	const uint8_t *payload, uint32_t length)
	72	{
	73	VSCMsgHeader scr_msg_header;
	74
	75	scr_msg_header.type = htonl(type);
	76	scr_msg_header.reader_id = htonl(reader_id);
	77	scr_msg_header.length = htonl(length);
6ab3fc32 DB	78	/* XXX this blocks entire thread. Rewrite to use
6ab3fc32 DB	79	* qemu_chr_fe_write and background I/O callbacks */
5345fdb4	80	qemu_chr_fe_write_all(&s->cs, (uint8_t *)&scr_msg_header,
6ab3fc32	81	sizeof(VSCMsgHeader));
5345fdb4	82	qemu_chr_fe_write_all(&s->cs, payload, length);
edbb2136 AL	83	}
	84
	85	static void ccid_card_vscard_send_apdu(PassthruState *s,
	86	const uint8_t *apdu, uint32_t length)
	87	{
	88	ccid_card_vscard_send_msg(
	89	s, VSC_APDU, VSCARD_MINIMAL_READER_ID, apdu, length);
	90	}
	91
	92	static void ccid_card_vscard_send_error(PassthruState *s,
	93	uint32_t reader_id, VSCErrorCode code)
	94	{
	95	VSCMsgError msg = {.code = htonl(code)};
	96
	97	ccid_card_vscard_send_msg(
	98	s, VSC_Error, reader_id, (uint8_t *)&msg, sizeof(msg));
	99	}
	100
	101	static void ccid_card_vscard_send_init(PassthruState *s)
	102	{
	103	VSCMsgInit msg = {
	104	.version = htonl(VSCARD_VERSION),
	105	.magic = VSCARD_MAGIC,
	106	.capabilities = {0}
	107	};
	108
	109	ccid_card_vscard_send_msg(s, VSC_Init, VSCARD_UNDEFINED_READER_ID,
	110	(uint8_t *)&msg, sizeof(msg));
	111	}
	112
	113	static int ccid_card_vscard_can_read(void *opaque)
	114	{
	115	PassthruState *card = opaque;
	116
	117	return VSCARD_IN_SIZE >= card->vscard_in_pos ?
	118	VSCARD_IN_SIZE - card->vscard_in_pos : 0;
	119	}
	120
	121	static void ccid_card_vscard_handle_init(
	122	PassthruState card, VSCMsgHeader hdr, VSCMsgInit *init)
	123	{
	124	uint32_t *capabilities;
	125	int num_capabilities;
	126	int i;
	127
	128	capabilities = init->capabilities;
	129	num_capabilities =
	130	1 + ((hdr->length - sizeof(VSCMsgInit)) / sizeof(uint32_t));
	131	init->version = ntohl(init->version);
	132	for (i = 0 ; i < num_capabilities; ++i) {
	133	capabilities[i] = ntohl(capabilities[i]);
	134	}
	135	if (init->magic != VSCARD_MAGIC) {
	136	error_report("wrong magic");
	137	/* we can't disconnect the chardev */
	138	}
	139	if (init->version != VSCARD_VERSION) {
	140	DPRINTF(card, D_WARN,
	141	"got version %d, have %d", init->version, VSCARD_VERSION);
	142	}
	143	/* future handling of capabilities, none exist atm */
	144	ccid_card_vscard_send_init(card);
	145	}
	146
0e61400c AL	147	static int check_atr(PassthruState card, uint8_t data, int len)
	148	{
	149	int historical_length, opt_bytes;
	150	int td_count = 0;
	151	int td;
	152
	153	if (len < 2) {
	154	return 0;
	155	}
	156	historical_length = data[1] & 0xf;
	157	opt_bytes = 0;
	158	if (data[0] != 0x3b && data[0] != 0x3f) {
	159	DPRINTF(card, D_WARN, "atr's T0 is 0x%X, not in {0x3b, 0x3f}\n",
	160	data[0]);
	161	return 0;
	162	}
	163	td_count = 0;
	164	td = data[1] >> 4;
	165	while (td && td_count < 2 && opt_bytes + historical_length + 2 < len) {
	166	td_count++;
	167	if (td & 0x1) {
	168	opt_bytes++;
	169	}
	170	if (td & 0x2) {
	171	opt_bytes++;
	172	}
	173	if (td & 0x4) {
	174	opt_bytes++;
	175	}
	176	if (td & 0x8) {
	177	opt_bytes++;
	178	td = data[opt_bytes + 2] >> 4;
	179	}
	180	}
	181	if (len < 2 + historical_length + opt_bytes) {
	182	DPRINTF(card, D_WARN,
	183	"atr too short: len %d, but historical_len %d, T1 0x%X\n",
	184	len, historical_length, data[1]);
	185	return 0;
	186	}
	187	if (len > 2 + historical_length + opt_bytes) {
	188	DPRINTF(card, D_WARN,
	189	"atr too long: len %d, but hist/opt %d/%d, T1 0x%X\n",
	190	len, historical_length, opt_bytes, data[1]);
	191	/* let it through */
	192	}
	193	DPRINTF(card, D_VERBOSE,
	194	"atr passes check: %d total length, %d historical, %d optional\n",
	195	len, historical_length, opt_bytes);
	196
	197	return 1;
	198	}
	199
edbb2136 AL	200	static void ccid_card_vscard_handle_message(PassthruState *card,
	201	VSCMsgHeader *scr_msg_header)
	202	{
	203	uint8_t data = (uint8_t )&scr_msg_header[1];
	204
	205	switch (scr_msg_header->type) {
	206	case VSC_ATR:
	207	DPRINTF(card, D_INFO, "VSC_ATR %d\n", scr_msg_header->length);
	208	if (scr_msg_header->length > MAX_ATR_SIZE) {
	209	error_report("ATR size exceeds spec, ignoring");
	210	ccid_card_vscard_send_error(card, scr_msg_header->reader_id,
	211	VSC_GENERAL_ERROR);
7e62255a	212	break;
edbb2136	213	}
0e61400c AL	214	if (!check_atr(card, data, scr_msg_header->length)) {
	215	error_report("ATR is inconsistent, ignoring");
	216	ccid_card_vscard_send_error(card, scr_msg_header->reader_id,
	217	VSC_GENERAL_ERROR);
	218	break;
	219	}
edbb2136 AL	220	memcpy(card->atr, data, scr_msg_header->length);
	221	card->atr_length = scr_msg_header->length;
	222	ccid_card_card_inserted(&card->base);
	223	ccid_card_vscard_send_error(card, scr_msg_header->reader_id,
	224	VSC_SUCCESS);
	225	break;
	226	case VSC_APDU:
	227	ccid_card_send_apdu_to_guest(
	228	&card->base, data, scr_msg_header->length);
	229	break;
	230	case VSC_CardRemove:
	231	DPRINTF(card, D_INFO, "VSC_CardRemove\n");
	232	ccid_card_card_removed(&card->base);
	233	ccid_card_vscard_send_error(card,
	234	scr_msg_header->reader_id, VSC_SUCCESS);
	235	break;
	236	case VSC_Init:
	237	ccid_card_vscard_handle_init(
	238	card, scr_msg_header, (VSCMsgInit *)data);
	239	break;
	240	case VSC_Error:
	241	ccid_card_card_error(&card->base, (uint32_t )data);
	242	break;
	243	case VSC_ReaderAdd:
	244	if (ccid_card_ccid_attach(&card->base) < 0) {
	245	ccid_card_vscard_send_error(card, VSCARD_UNDEFINED_READER_ID,
	246	VSC_CANNOT_ADD_MORE_READERS);
	247	} else {
	248	ccid_card_vscard_send_error(card, VSCARD_MINIMAL_READER_ID,
	249	VSC_SUCCESS);
	250	}
	251	break;
	252	case VSC_ReaderRemove:
	253	ccid_card_ccid_detach(&card->base);
	254	ccid_card_vscard_send_error(card,
	255	scr_msg_header->reader_id, VSC_SUCCESS);
	256	break;
	257	default:
	258	printf("usb-ccid: chardev: unexpected message of type %X\n",
	259	scr_msg_header->type);
	260	ccid_card_vscard_send_error(card, scr_msg_header->reader_id,
	261	VSC_GENERAL_ERROR);
	262	}
	263	}
	264
	265	static void ccid_card_vscard_drop_connection(PassthruState *card)
	266	{
1ce2610c	267	qemu_chr_fe_deinit(&card->cs, true);
edbb2136 AL	268	card->vscard_in_pos = card->vscard_in_hdr = 0;
	269	}
	270
	271	static void ccid_card_vscard_read(void opaque, const uint8_t buf, int size)
	272	{
	273	PassthruState *card = opaque;
	274	VSCMsgHeader *hdr;
	275
	276	if (card->vscard_in_pos + size > VSCARD_IN_SIZE) {
	277	error_report(
	278	"no room for data: pos %d + size %d > %d. dropping connection.",
	279	card->vscard_in_pos, size, VSCARD_IN_SIZE);
	280	ccid_card_vscard_drop_connection(card);
	281	return;
	282	}
	283	assert(card->vscard_in_pos < VSCARD_IN_SIZE);
	284	assert(card->vscard_in_hdr < VSCARD_IN_SIZE);
	285	memcpy(card->vscard_in_data + card->vscard_in_pos, buf, size);
	286	card->vscard_in_pos += size;
	287	hdr = (VSCMsgHeader *)(card->vscard_in_data + card->vscard_in_hdr);
	288
	289	while ((card->vscard_in_pos - card->vscard_in_hdr >= sizeof(VSCMsgHeader))
	290	&&(card->vscard_in_pos - card->vscard_in_hdr >=
	291	sizeof(VSCMsgHeader) + ntohl(hdr->length))) {
	292	hdr->reader_id = ntohl(hdr->reader_id);
	293	hdr->length = ntohl(hdr->length);
	294	hdr->type = ntohl(hdr->type);
	295	ccid_card_vscard_handle_message(card, hdr);
	296	card->vscard_in_hdr += hdr->length + sizeof(VSCMsgHeader);
	297	hdr = (VSCMsgHeader *)(card->vscard_in_data + card->vscard_in_hdr);
	298	}
	299	if (card->vscard_in_hdr == card->vscard_in_pos) {
	300	card->vscard_in_pos = card->vscard_in_hdr = 0;
	301	}
	302	}
	303
	304	static void ccid_card_vscard_event(void *opaque, int event)
	305	{
	306	PassthruState *card = opaque;
	307
	308	switch (event) {
	309	case CHR_EVENT_BREAK:
	310	card->vscard_in_pos = card->vscard_in_hdr = 0;
	311	break;
edbb2136 AL	312	case CHR_EVENT_OPENED:
	313	DPRINTF(card, D_INFO, "%s: CHR_EVENT_OPENED\n", __func__);
	314	break;
	315	}
	316	}
	317
	318	/* End VSCard handling */
	319
	320	static void passthru_apdu_from_guest(
	321	CCIDCardState base, const uint8_t apdu, uint32_t len)
	322	{
059db204	323	PassthruState *card = PASSTHRU_CCID_CARD(base);
edbb2136	324
30650701	325	if (!qemu_chr_fe_backend_connected(&card->cs)) {
edbb2136 AL	326	printf("ccid-passthru: no chardev, discarding apdu length %d\n", len);
	327	return;
	328	}
	329	ccid_card_vscard_send_apdu(card, apdu, len);
	330	}
	331
	332	static const uint8_t passthru_get_atr(CCIDCardState base, uint32_t *len)
	333	{
059db204	334	PassthruState *card = PASSTHRU_CCID_CARD(base);
edbb2136 AL	335
	336	*len = card->atr_length;
	337	return card->atr;
	338	}
	339
	340	static int passthru_initfn(CCIDCardState *base)
	341	{
059db204	342	PassthruState *card = PASSTHRU_CCID_CARD(base);
edbb2136 AL	343
	344	card->vscard_in_pos = 0;
	345	card->vscard_in_hdr = 0;
30650701	346	if (qemu_chr_fe_backend_connected(&card->cs)) {
edbb2136	347	DPRINTF(card, D_INFO, "initing chardev\n");
5345fdb4	348	qemu_chr_fe_set_handlers(&card->cs,
edbb2136 AL	349	ccid_card_vscard_can_read,
edbb2136 AL	350	ccid_card_vscard_read,
81517ba3	351	ccid_card_vscard_event, NULL, card, NULL, true);
edbb2136 AL	352	ccid_card_vscard_send_init(card);
	353	} else {
	354	error_report("missing chardev");
	355	return -1;
	356	}
b16352ac AL	357	card->debug = parse_debug_env("QEMU_CCID_PASSTHRU_DEBUG", D_VERBOSE,
b16352ac AL	358	card->debug);
edbb2136 AL	359	assert(sizeof(DEFAULT_ATR) <= MAX_ATR_SIZE);
	360	memcpy(card->atr, DEFAULT_ATR, sizeof(DEFAULT_ATR));
	361	card->atr_length = sizeof(DEFAULT_ATR);
	362	return 0;
	363	}
	364
edbb2136	365	static VMStateDescription passthru_vmstate = {
6783ecf1	366	.name = "ccid-card-passthru",
edbb2136 AL	367	.version_id = 1,
	368	.minimum_version_id = 1,
	369	.fields = (VMStateField[]) {
	370	VMSTATE_BUFFER(vscard_in_data, PassthruState),
	371	VMSTATE_UINT32(vscard_in_pos, PassthruState),
	372	VMSTATE_UINT32(vscard_in_hdr, PassthruState),
	373	VMSTATE_BUFFER(atr, PassthruState),
	374	VMSTATE_UINT8(atr_length, PassthruState),
	375	VMSTATE_END_OF_LIST()
	376	}
	377	};
	378
39bffca2 AL	379	static Property passthru_card_properties[] = {
	380	DEFINE_PROP_CHR("chardev", PassthruState, cs),
	381	DEFINE_PROP_UINT8("debug", PassthruState, debug, 0),
	382	DEFINE_PROP_END_OF_LIST(),
	383	};
	384
ba7c0520 AL	385	static void passthru_class_initfn(ObjectClass klass, void data)
ba7c0520 AL	386	{
39bffca2	387	DeviceClass *dc = DEVICE_CLASS(klass);
ba7c0520 AL	388	CCIDCardClass *cc = CCID_CARD_CLASS(klass);
	389
	390	cc->initfn = passthru_initfn;
ba7c0520 AL	391	cc->get_atr = passthru_get_atr;
ba7c0520 AL	392	cc->apdu_from_guest = passthru_apdu_from_guest;
125ee0ed	393	set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
39bffca2 AL	394	dc->desc = "passthrough smartcard";
	395	dc->vmsd = &passthru_vmstate;
	396	dc->props = passthru_card_properties;
ba7c0520 AL	397	}
ba7c0520 AL	398
8c43a6f0	399	static const TypeInfo passthru_card_info = {
059db204	400	.name = TYPE_CCID_PASSTHRU,
39bffca2 AL	401	.parent = TYPE_CCID_CARD,
	402	.instance_size = sizeof(PassthruState),
	403	.class_init = passthru_class_initfn,
edbb2136 AL	404	};
edbb2136 AL	405
83f7d43a	406	static void ccid_card_passthru_register_types(void)
edbb2136	407	{
39bffca2	408	type_register_static(&passthru_card_info);
edbb2136 AL	409	}
edbb2136 AL	410
83f7d43a	411	type_init(ccid_card_passthru_register_types)