[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 "qemu-common.h"
#include "qemu/units.h"
#include <libcacard.h>
#include "chardev/char-fe.h"
#include "hw/qdev-properties.h"
#include "migration/vmstate.h"
#include "qemu/error-report.h"
#include "qemu/module.h"
#include "qemu/sockets.h"
#include "ccid.h"
#include "qapi/error.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      (64 * KiB)

/* 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 %u +  size %d > %" PRId64 "."
                     " 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 void passthru_realize(CCIDCardState *base, Error **errp)
{
    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, "ccid-card-passthru: initing chardev");
        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_setg(errp, "missing chardev");
        return;
    }
    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);
}

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->realize = passthru_realize;
    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"
a8d25326	12	#include "qemu-common.h"
246e195b	13	#include "qemu/units.h"
0f5c642d	14	#include <libcacard.h>
4d43a603	15	#include "chardev/char-fe.h"
a27bd6c7	16	#include "hw/qdev-properties.h"
d6454270	17	#include "migration/vmstate.h"
d49b6836	18	#include "qemu/error-report.h"
0b8fa32f	19	#include "qemu/module.h"
1de7afc9	20	#include "qemu/sockets.h"
47b43a1f	21	#include "ccid.h"
cc847bfd	22	#include "qapi/error.h"
edbb2136 AL	23
	24	#define DPRINTF(card, lvl, fmt, ...) \
	25	do { \
	26	if (lvl <= card->debug) { \
	27	printf("ccid-card-passthru: " fmt , ## __VA_ARGS__); \
	28	} \
	29	} while (0)
	30
	31	#define D_WARN 1
	32	#define D_INFO 2
	33	#define D_MORE_INFO 3
	34	#define D_VERBOSE 4
	35
	36	/* TODO: do we still need this? */
da000a48	37	static const uint8_t DEFAULT_ATR[] = {
edbb2136 AL	38	/*
	39	* From some example somewhere
	40	* 0x3B, 0xB0, 0x18, 0x00, 0xD1, 0x81, 0x05, 0xB1, 0x40, 0x38, 0x1F, 0x03, 0x28
	41	*/
	42
	43	/* From an Athena smart card */
	44	0x3B, 0xD5, 0x18, 0xFF, 0x80, 0x91, 0xFE, 0x1F, 0xC3, 0x80, 0x73, 0xC8, 0x21,
	45	0x13, 0x08
	46	};
	47
246e195b	48	#define VSCARD_IN_SIZE (64 * KiB)
edbb2136 AL	49
	50	/* maximum size of ATR - from 7816-3 */
	51	#define MAX_ATR_SIZE 40
	52
	53	typedef struct PassthruState PassthruState;
	54
	55	struct PassthruState {
	56	CCIDCardState base;
becdfa00	57	CharBackend cs;
edbb2136 AL	58	uint8_t vscard_in_data[VSCARD_IN_SIZE];
	59	uint32_t vscard_in_pos;
	60	uint32_t vscard_in_hdr;
	61	uint8_t atr[MAX_ATR_SIZE];
	62	uint8_t atr_length;
	63	uint8_t debug;
	64	};
	65
059db204 C	66	#define TYPE_CCID_PASSTHRU "ccid-card-passthru"
	67	#define PASSTHRU_CCID_CARD(obj) \
	68	OBJECT_CHECK(PassthruState, (obj), TYPE_CCID_PASSTHRU)
	69
edbb2136 AL	70	/*
	71	* VSCard protocol over chardev
	72	* This code should not depend on the card type.
	73	*/
	74
	75	static void ccid_card_vscard_send_msg(PassthruState *s,
	76	VSCMsgType type, uint32_t reader_id,
	77	const uint8_t *payload, uint32_t length)
	78	{
	79	VSCMsgHeader scr_msg_header;
	80
	81	scr_msg_header.type = htonl(type);
	82	scr_msg_header.reader_id = htonl(reader_id);
	83	scr_msg_header.length = htonl(length);
6ab3fc32 DB	84	/* XXX this blocks entire thread. Rewrite to use
6ab3fc32 DB	85	* qemu_chr_fe_write and background I/O callbacks */
5345fdb4	86	qemu_chr_fe_write_all(&s->cs, (uint8_t *)&scr_msg_header,
6ab3fc32	87	sizeof(VSCMsgHeader));
5345fdb4	88	qemu_chr_fe_write_all(&s->cs, payload, length);
edbb2136 AL	89	}
	90
	91	static void ccid_card_vscard_send_apdu(PassthruState *s,
	92	const uint8_t *apdu, uint32_t length)
	93	{
	94	ccid_card_vscard_send_msg(
	95	s, VSC_APDU, VSCARD_MINIMAL_READER_ID, apdu, length);
	96	}
	97
	98	static void ccid_card_vscard_send_error(PassthruState *s,
	99	uint32_t reader_id, VSCErrorCode code)
	100	{
	101	VSCMsgError msg = {.code = htonl(code)};
	102
	103	ccid_card_vscard_send_msg(
	104	s, VSC_Error, reader_id, (uint8_t *)&msg, sizeof(msg));
	105	}
	106
	107	static void ccid_card_vscard_send_init(PassthruState *s)
	108	{
	109	VSCMsgInit msg = {
	110	.version = htonl(VSCARD_VERSION),
	111	.magic = VSCARD_MAGIC,
	112	.capabilities = {0}
	113	};
	114
	115	ccid_card_vscard_send_msg(s, VSC_Init, VSCARD_UNDEFINED_READER_ID,
	116	(uint8_t *)&msg, sizeof(msg));
	117	}
	118
	119	static int ccid_card_vscard_can_read(void *opaque)
	120	{
	121	PassthruState *card = opaque;
	122
	123	return VSCARD_IN_SIZE >= card->vscard_in_pos ?
	124	VSCARD_IN_SIZE - card->vscard_in_pos : 0;
	125	}
	126
	127	static void ccid_card_vscard_handle_init(
	128	PassthruState card, VSCMsgHeader hdr, VSCMsgInit *init)
	129	{
	130	uint32_t *capabilities;
	131	int num_capabilities;
	132	int i;
	133
	134	capabilities = init->capabilities;
	135	num_capabilities =
	136	1 + ((hdr->length - sizeof(VSCMsgInit)) / sizeof(uint32_t));
	137	init->version = ntohl(init->version);
	138	for (i = 0 ; i < num_capabilities; ++i) {
	139	capabilities[i] = ntohl(capabilities[i]);
	140	}
	141	if (init->magic != VSCARD_MAGIC) {
	142	error_report("wrong magic");
	143	/* we can't disconnect the chardev */
	144	}
	145	if (init->version != VSCARD_VERSION) {
	146	DPRINTF(card, D_WARN,
	147	"got version %d, have %d", init->version, VSCARD_VERSION);
	148	}
	149	/* future handling of capabilities, none exist atm */
	150	ccid_card_vscard_send_init(card);
	151	}
	152
0e61400c AL	153	static int check_atr(PassthruState card, uint8_t data, int len)
	154	{
	155	int historical_length, opt_bytes;
	156	int td_count = 0;
	157	int td;
	158
	159	if (len < 2) {
	160	return 0;
	161	}
	162	historical_length = data[1] & 0xf;
	163	opt_bytes = 0;
	164	if (data[0] != 0x3b && data[0] != 0x3f) {
	165	DPRINTF(card, D_WARN, "atr's T0 is 0x%X, not in {0x3b, 0x3f}\n",
	166	data[0]);
	167	return 0;
	168	}
	169	td_count = 0;
	170	td = data[1] >> 4;
	171	while (td && td_count < 2 && opt_bytes + historical_length + 2 < len) {
	172	td_count++;
	173	if (td & 0x1) {
	174	opt_bytes++;
	175	}
	176	if (td & 0x2) {
	177	opt_bytes++;
	178	}
	179	if (td & 0x4) {
	180	opt_bytes++;
	181	}
	182	if (td & 0x8) {
	183	opt_bytes++;
	184	td = data[opt_bytes + 2] >> 4;
	185	}
	186	}
	187	if (len < 2 + historical_length + opt_bytes) {
	188	DPRINTF(card, D_WARN,
	189	"atr too short: len %d, but historical_len %d, T1 0x%X\n",
	190	len, historical_length, data[1]);
	191	return 0;
	192	}
	193	if (len > 2 + historical_length + opt_bytes) {
	194	DPRINTF(card, D_WARN,
	195	"atr too long: len %d, but hist/opt %d/%d, T1 0x%X\n",
	196	len, historical_length, opt_bytes, data[1]);
	197	/* let it through */
	198	}
	199	DPRINTF(card, D_VERBOSE,
	200	"atr passes check: %d total length, %d historical, %d optional\n",
	201	len, historical_length, opt_bytes);
	202
	203	return 1;
	204	}
	205
edbb2136 AL	206	static void ccid_card_vscard_handle_message(PassthruState *card,
	207	VSCMsgHeader *scr_msg_header)
	208	{
	209	uint8_t data = (uint8_t )&scr_msg_header[1];
	210
	211	switch (scr_msg_header->type) {
	212	case VSC_ATR:
	213	DPRINTF(card, D_INFO, "VSC_ATR %d\n", scr_msg_header->length);
	214	if (scr_msg_header->length > MAX_ATR_SIZE) {
	215	error_report("ATR size exceeds spec, ignoring");
	216	ccid_card_vscard_send_error(card, scr_msg_header->reader_id,
	217	VSC_GENERAL_ERROR);
7e62255a	218	break;
edbb2136	219	}
0e61400c AL	220	if (!check_atr(card, data, scr_msg_header->length)) {
	221	error_report("ATR is inconsistent, ignoring");
	222	ccid_card_vscard_send_error(card, scr_msg_header->reader_id,
	223	VSC_GENERAL_ERROR);
	224	break;
	225	}
edbb2136 AL	226	memcpy(card->atr, data, scr_msg_header->length);
	227	card->atr_length = scr_msg_header->length;
	228	ccid_card_card_inserted(&card->base);
	229	ccid_card_vscard_send_error(card, scr_msg_header->reader_id,
	230	VSC_SUCCESS);
	231	break;
	232	case VSC_APDU:
	233	ccid_card_send_apdu_to_guest(
	234	&card->base, data, scr_msg_header->length);
	235	break;
	236	case VSC_CardRemove:
	237	DPRINTF(card, D_INFO, "VSC_CardRemove\n");
	238	ccid_card_card_removed(&card->base);
	239	ccid_card_vscard_send_error(card,
	240	scr_msg_header->reader_id, VSC_SUCCESS);
	241	break;
	242	case VSC_Init:
	243	ccid_card_vscard_handle_init(
	244	card, scr_msg_header, (VSCMsgInit *)data);
	245	break;
	246	case VSC_Error:
	247	ccid_card_card_error(&card->base, (uint32_t )data);
	248	break;
	249	case VSC_ReaderAdd:
	250	if (ccid_card_ccid_attach(&card->base) < 0) {
	251	ccid_card_vscard_send_error(card, VSCARD_UNDEFINED_READER_ID,
	252	VSC_CANNOT_ADD_MORE_READERS);
	253	} else {
	254	ccid_card_vscard_send_error(card, VSCARD_MINIMAL_READER_ID,
	255	VSC_SUCCESS);
	256	}
	257	break;
	258	case VSC_ReaderRemove:
	259	ccid_card_ccid_detach(&card->base);
	260	ccid_card_vscard_send_error(card,
	261	scr_msg_header->reader_id, VSC_SUCCESS);
	262	break;
	263	default:
	264	printf("usb-ccid: chardev: unexpected message of type %X\n",
	265	scr_msg_header->type);
	266	ccid_card_vscard_send_error(card, scr_msg_header->reader_id,
	267	VSC_GENERAL_ERROR);
	268	}
	269	}
	270
	271	static void ccid_card_vscard_drop_connection(PassthruState *card)
	272	{
1ce2610c	273	qemu_chr_fe_deinit(&card->cs, true);
edbb2136 AL	274	card->vscard_in_pos = card->vscard_in_hdr = 0;
	275	}
	276
	277	static void ccid_card_vscard_read(void opaque, const uint8_t buf, int size)
	278	{
	279	PassthruState *card = opaque;
	280	VSCMsgHeader *hdr;
	281
	282	if (card->vscard_in_pos + size > VSCARD_IN_SIZE) {
246e195b PMD	283	error_report("no room for data: pos %u + size %d > %" PRId64 "."
	284	" dropping connection.",
	285	card->vscard_in_pos, size, VSCARD_IN_SIZE);
edbb2136 AL	286	ccid_card_vscard_drop_connection(card);
	287	return;
	288	}
	289	assert(card->vscard_in_pos < VSCARD_IN_SIZE);
	290	assert(card->vscard_in_hdr < VSCARD_IN_SIZE);
	291	memcpy(card->vscard_in_data + card->vscard_in_pos, buf, size);
	292	card->vscard_in_pos += size;
	293	hdr = (VSCMsgHeader *)(card->vscard_in_data + card->vscard_in_hdr);
	294
	295	while ((card->vscard_in_pos - card->vscard_in_hdr >= sizeof(VSCMsgHeader))
	296	&&(card->vscard_in_pos - card->vscard_in_hdr >=
	297	sizeof(VSCMsgHeader) + ntohl(hdr->length))) {
	298	hdr->reader_id = ntohl(hdr->reader_id);
	299	hdr->length = ntohl(hdr->length);
	300	hdr->type = ntohl(hdr->type);
	301	ccid_card_vscard_handle_message(card, hdr);
	302	card->vscard_in_hdr += hdr->length + sizeof(VSCMsgHeader);
	303	hdr = (VSCMsgHeader *)(card->vscard_in_data + card->vscard_in_hdr);
	304	}
	305	if (card->vscard_in_hdr == card->vscard_in_pos) {
	306	card->vscard_in_pos = card->vscard_in_hdr = 0;
	307	}
	308	}
	309
	310	static void ccid_card_vscard_event(void *opaque, int event)
	311	{
	312	PassthruState *card = opaque;
	313
	314	switch (event) {
	315	case CHR_EVENT_BREAK:
	316	card->vscard_in_pos = card->vscard_in_hdr = 0;
	317	break;
edbb2136 AL	318	case CHR_EVENT_OPENED:
	319	DPRINTF(card, D_INFO, "%s: CHR_EVENT_OPENED\n", __func__);
	320	break;
	321	}
	322	}
	323
	324	/* End VSCard handling */
	325
	326	static void passthru_apdu_from_guest(
	327	CCIDCardState base, const uint8_t apdu, uint32_t len)
	328	{
059db204	329	PassthruState *card = PASSTHRU_CCID_CARD(base);
edbb2136	330
30650701	331	if (!qemu_chr_fe_backend_connected(&card->cs)) {
edbb2136 AL	332	printf("ccid-passthru: no chardev, discarding apdu length %d\n", len);
	333	return;
	334	}
	335	ccid_card_vscard_send_apdu(card, apdu, len);
	336	}
	337
	338	static const uint8_t passthru_get_atr(CCIDCardState base, uint32_t *len)
	339	{
059db204	340	PassthruState *card = PASSTHRU_CCID_CARD(base);
edbb2136 AL	341
	342	*len = card->atr_length;
	343	return card->atr;
	344	}
	345
cc847bfd	346	static void passthru_realize(CCIDCardState base, Error *errp)
edbb2136	347	{
059db204	348	PassthruState *card = PASSTHRU_CCID_CARD(base);
edbb2136 AL	349
	350	card->vscard_in_pos = 0;
	351	card->vscard_in_hdr = 0;
30650701	352	if (qemu_chr_fe_backend_connected(&card->cs)) {
e58d64a1	353	DPRINTF(card, D_INFO, "ccid-card-passthru: initing chardev");
5345fdb4	354	qemu_chr_fe_set_handlers(&card->cs,
edbb2136 AL	355	ccid_card_vscard_can_read,
edbb2136 AL	356	ccid_card_vscard_read,
81517ba3	357	ccid_card_vscard_event, NULL, card, NULL, true);
edbb2136 AL	358	ccid_card_vscard_send_init(card);
edbb2136 AL	359	} else {
cc847bfd MZ	360	error_setg(errp, "missing chardev");
cc847bfd MZ	361	return;
edbb2136	362	}
b16352ac AL	363	card->debug = parse_debug_env("QEMU_CCID_PASSTHRU_DEBUG", D_VERBOSE,
b16352ac AL	364	card->debug);
edbb2136 AL	365	assert(sizeof(DEFAULT_ATR) <= MAX_ATR_SIZE);
	366	memcpy(card->atr, DEFAULT_ATR, sizeof(DEFAULT_ATR));
	367	card->atr_length = sizeof(DEFAULT_ATR);
edbb2136 AL	368	}
edbb2136 AL	369
edbb2136	370	static VMStateDescription passthru_vmstate = {
6783ecf1	371	.name = "ccid-card-passthru",
edbb2136 AL	372	.version_id = 1,
	373	.minimum_version_id = 1,
	374	.fields = (VMStateField[]) {
	375	VMSTATE_BUFFER(vscard_in_data, PassthruState),
	376	VMSTATE_UINT32(vscard_in_pos, PassthruState),
	377	VMSTATE_UINT32(vscard_in_hdr, PassthruState),
	378	VMSTATE_BUFFER(atr, PassthruState),
	379	VMSTATE_UINT8(atr_length, PassthruState),
	380	VMSTATE_END_OF_LIST()
	381	}
	382	};
	383
39bffca2 AL	384	static Property passthru_card_properties[] = {
	385	DEFINE_PROP_CHR("chardev", PassthruState, cs),
	386	DEFINE_PROP_UINT8("debug", PassthruState, debug, 0),
	387	DEFINE_PROP_END_OF_LIST(),
	388	};
	389
ba7c0520 AL	390	static void passthru_class_initfn(ObjectClass klass, void data)
ba7c0520 AL	391	{
39bffca2	392	DeviceClass *dc = DEVICE_CLASS(klass);
ba7c0520 AL	393	CCIDCardClass *cc = CCID_CARD_CLASS(klass);
ba7c0520 AL	394
cc847bfd	395	cc->realize = passthru_realize;
ba7c0520 AL	396	cc->get_atr = passthru_get_atr;
ba7c0520 AL	397	cc->apdu_from_guest = passthru_apdu_from_guest;
125ee0ed	398	set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
39bffca2 AL	399	dc->desc = "passthrough smartcard";
	400	dc->vmsd = &passthru_vmstate;
	401	dc->props = passthru_card_properties;
ba7c0520 AL	402	}
ba7c0520 AL	403
8c43a6f0	404	static const TypeInfo passthru_card_info = {
059db204	405	.name = TYPE_CCID_PASSTHRU,
39bffca2 AL	406	.parent = TYPE_CCID_CARD,
	407	.instance_size = sizeof(PassthruState),
	408	.class_init = passthru_class_initfn,
edbb2136 AL	409	};
edbb2136 AL	410
83f7d43a	411	static void ccid_card_passthru_register_types(void)
edbb2136	412	{
39bffca2	413	type_register_static(&passthru_card_info);
edbb2136 AL	414	}
edbb2136 AL	415
83f7d43a	416	type_init(ccid_card_passthru_register_types)