Archipelago » qemu

/*

 * emulate the reader

 *

 * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.

 * See the COPYING.LIB file in the top-level directory.

 */

#include "qemu-common.h"

#include "qemu/thread.h"

#include "vcard.h"

#include "vcard_emul.h"

#include "card_7816.h"

#include "vreader.h"

#include "vevent.h"

struct VReaderStruct {

    int    reference_count;

    VCard *card;

    char *name;

    vreader_id_t id;

    QemuMutex lock;

    VReaderEmul  *reader_private;

    VReaderEmulFree reader_private_free;

};

/* manage locking */

static inline void

vreader_lock(VReader *reader)

{

    qemu_mutex_lock(&reader->lock);

}

static inline void

vreader_unlock(VReader *reader)

{

    qemu_mutex_unlock(&reader->lock);

}

/*

 * vreader constructor

 */

VReader *

vreader_new(const char *name, VReaderEmul *private,

            VReaderEmulFree private_free)

{

    VReader *reader;

    reader = (VReader *)g_malloc(sizeof(VReader));

    qemu_mutex_init(&reader->lock);

    reader->reference_count = 1;

    reader->name = name ? strdup(name) : NULL;

    reader->card = NULL;

    reader->id = (vreader_id_t)-1;

    reader->reader_private = private;

    reader->reader_private_free = private_free;

    return reader;

}

/* get a reference */

VReader*

vreader_reference(VReader *reader)

{

    if (reader == NULL) {

        return NULL;

    }

    vreader_lock(reader);

    reader->reference_count++;

    vreader_unlock(reader);

    return reader;

}

/* free a reference */

void

vreader_free(VReader *reader)

{

    if (reader == NULL) {

        return;

    }

    vreader_lock(reader);

    if (reader->reference_count-- > 1) {

        vreader_unlock(reader);

        return;

    }

    vreader_unlock(reader);

    if (reader->card) {

        vcard_free(reader->card);

    }

    if (reader->name) {

        g_free(reader->name);

    }

    if (reader->reader_private_free) {

        reader->reader_private_free(reader->reader_private);

    }

    g_free(reader);

}

static VCard *

vreader_get_card(VReader *reader)

{

    VCard *card;

    vreader_lock(reader);

    card = vcard_reference(reader->card);

    vreader_unlock(reader);

    return card;

}

VReaderStatus

vreader_card_is_present(VReader *reader)

{

    VCard *card = vreader_get_card(reader);

    if (card == NULL) {

        return VREADER_NO_CARD;

    }

    vcard_free(card);

    return VREADER_OK;

}

vreader_id_t

vreader_get_id(VReader *reader)

{

    if (reader == NULL) {

        return (vreader_id_t)-1;

    }

    return reader->id;

}

VReaderStatus

vreader_set_id(VReader *reader, vreader_id_t id)

{

    if (reader == NULL) {

        return VREADER_NO_CARD;

    }

    reader->id = id;

    return VREADER_OK;

}

const char *

vreader_get_name(VReader *reader)

{

    if (reader == NULL) {

        return NULL;

    }

    return reader->name;

}

VReaderEmul *

vreader_get_private(VReader *reader)

{

    return reader->reader_private;

}

static VReaderStatus

vreader_reset(VReader *reader, VCardPower power, unsigned char *atr, int *len)

{

    VCard *card = vreader_get_card(reader);

    if (card == NULL) {

        return VREADER_NO_CARD;

    }

    /*

     * clean up our state

     */

    vcard_reset(card, power);

    if (atr) {

        vcard_get_atr(card, atr, len);

    }

    vcard_free(card); /* free our reference */

    return VREADER_OK;

}

VReaderStatus

vreader_power_on(VReader *reader, unsigned char *atr, int *len)

{

    return vreader_reset(reader, VCARD_POWER_ON, atr, len);

}

VReaderStatus

vreader_power_off(VReader *reader)

{

    return vreader_reset(reader, VCARD_POWER_OFF, NULL, 0);

}

VReaderStatus

vreader_xfr_bytes(VReader *reader,

                  unsigned char *send_buf, int send_buf_len,

                  unsigned char *receive_buf, int *receive_buf_len)

{

    VCardAPDU *apdu;

    VCardResponse *response = NULL;

    VCardStatus card_status;

    unsigned short status;

    VCard *card = vreader_get_card(reader);

    if (card == NULL) {

        return VREADER_NO_CARD;

    }

    apdu = vcard_apdu_new(send_buf, send_buf_len, &status);

    if (apdu == NULL) {

        response = vcard_make_response(status);

        card_status = VCARD_DONE;

    } else {

        card_status = vcard_process_apdu(card, apdu, &response);

    }

    assert(card_status == VCARD_DONE);

    if (card_status == VCARD_DONE) {

        int size = MIN(*receive_buf_len, response->b_total_len);

        memcpy(receive_buf, response->b_data, size);

        *receive_buf_len = size;

    }

    vcard_response_delete(response);

    vcard_apdu_delete(apdu);

    vcard_free(card); /* free our reference */

    return VREADER_OK;

}

struct VReaderListStruct {

    VReaderListEntry *head;

    VReaderListEntry *tail;

};

struct VReaderListEntryStruct {

    VReaderListEntry *next;

    VReaderListEntry *prev;

    VReader *reader;

};

static VReaderListEntry *

vreader_list_entry_new(VReader *reader)

{

    VReaderListEntry *new_reader_list_entry;

    new_reader_list_entry = (VReaderListEntry *)

                               g_malloc(sizeof(VReaderListEntry));

    new_reader_list_entry->next = NULL;

    new_reader_list_entry->prev = NULL;

    new_reader_list_entry->reader = vreader_reference(reader);

    return new_reader_list_entry;

}

static void

vreader_list_entry_delete(VReaderListEntry *entry)

{

    if (entry == NULL) {

        return;

    }

    vreader_free(entry->reader);

    g_free(entry);

}

static VReaderList *

vreader_list_new(void)

{

    VReaderList *new_reader_list;

    new_reader_list = (VReaderList *)g_malloc(sizeof(VReaderList));

    new_reader_list->head = NULL;

    new_reader_list->tail = NULL;

    return new_reader_list;

}

void

vreader_list_delete(VReaderList *list)

{

    VReaderListEntry *current_entry;

    VReaderListEntry *next_entry = NULL;

    for (current_entry = vreader_list_get_first(list); current_entry;

         current_entry = next_entry) {

        next_entry = vreader_list_get_next(current_entry);

        vreader_list_entry_delete(current_entry);

    }

    list->head = NULL;

    list->tail = NULL;

    g_free(list);

}

VReaderListEntry *

vreader_list_get_first(VReaderList *list)

{

    return list ? list->head : NULL;

}

VReaderListEntry *

vreader_list_get_next(VReaderListEntry *current)

{

    return current ? current->next : NULL;

}

VReader *

vreader_list_get_reader(VReaderListEntry *entry)

{

    return entry ? vreader_reference(entry->reader) : NULL;

}

static void

vreader_queue(VReaderList *list, VReaderListEntry *entry)

{

    if (entry == NULL) {

        return;

    }

    entry->next = NULL;

    entry->prev = list->tail;

    if (list->head) {

        list->tail->next = entry;

    } else {

        list->head = entry;

    }

    list->tail = entry;

}

static void

vreader_dequeue(VReaderList *list, VReaderListEntry *entry)

{

    if (entry == NULL) {

        return;

    }

    if (entry->next == NULL) {

        list->tail = entry->prev;

    } else if (entry->prev == NULL) {

        list->head = entry->next;

    } else {

        entry->prev->next = entry->next;

        entry->next->prev = entry->prev;

    }

    if ((list->tail == NULL) || (list->head == NULL)) {

        list->head = list->tail = NULL;

    }

    entry->next = entry->prev = NULL;

}

static VReaderList *vreader_list;

static QemuMutex vreader_list_mutex;

static void

vreader_list_init(void)

{

    vreader_list = vreader_list_new();

    qemu_mutex_init(&vreader_list_mutex);

}

static void

vreader_list_lock(void)

{

    qemu_mutex_lock(&vreader_list_mutex);

}

static void

vreader_list_unlock(void)

{

    qemu_mutex_unlock(&vreader_list_mutex);

}

static VReaderList *

vreader_copy_list(VReaderList *list)

{

    VReaderList *new_list = NULL;

    VReaderListEntry *current_entry = NULL;

    new_list = vreader_list_new();

    if (new_list == NULL) {

        return NULL;

    }

    for (current_entry = vreader_list_get_first(list); current_entry;

         current_entry = vreader_list_get_next(current_entry)) {

        VReader *reader = vreader_list_get_reader(current_entry);

        VReaderListEntry *new_entry = vreader_list_entry_new(reader);

        vreader_free(reader);

        vreader_queue(new_list, new_entry);

    }

    return new_list;

}

VReaderList *

vreader_get_reader_list(void)

{

    VReaderList *new_reader_list;

    vreader_list_lock();

    new_reader_list = vreader_copy_list(vreader_list);

    vreader_list_unlock();

    return new_reader_list;

}

VReader *

vreader_get_reader_by_id(vreader_id_t id)

{

    VReader *reader = NULL;

    VReaderListEntry *current_entry = NULL;

    if (id == (vreader_id_t) -1) {

        return NULL;

    }

    vreader_list_lock();

    for (current_entry = vreader_list_get_first(vreader_list); current_entry;

            current_entry = vreader_list_get_next(current_entry)) {

        VReader *creader = vreader_list_get_reader(current_entry);

        if (creader->id == id) {

            reader = creader;

            break;

        }

        vreader_free(creader);

    }

    vreader_list_unlock();

    return reader;

}

VReader *

vreader_get_reader_by_name(const char *name)

{

    VReader *reader = NULL;

    VReaderListEntry *current_entry = NULL;

    vreader_list_lock();

    for (current_entry = vreader_list_get_first(vreader_list); current_entry;

            current_entry = vreader_list_get_next(current_entry)) {

        VReader *creader = vreader_list_get_reader(current_entry);

        if (strcmp(creader->name, name) == 0) {

            reader = creader;

            break;

        }

        vreader_free(creader);

    }

    vreader_list_unlock();

    return reader;

}

/* called from card_emul to initialize the readers */

VReaderStatus

vreader_add_reader(VReader *reader)

{

    VReaderListEntry *reader_entry;

    reader_entry = vreader_list_entry_new(reader);

    if (reader_entry == NULL) {

        return VREADER_OUT_OF_MEMORY;

    }

    vreader_list_lock();

    vreader_queue(vreader_list, reader_entry);

    vreader_list_unlock();

    vevent_queue_vevent(vevent_new(VEVENT_READER_INSERT, reader, NULL));

    return VREADER_OK;

}

VReaderStatus

vreader_remove_reader(VReader *reader)

{

    VReaderListEntry *current_entry;

    vreader_list_lock();

    for (current_entry = vreader_list_get_first(vreader_list); current_entry;

         current_entry = vreader_list_get_next(current_entry)) {

        if (current_entry->reader == reader) {

            break;

        }

    }

    vreader_dequeue(vreader_list, current_entry);

    vreader_list_unlock();

    vreader_list_entry_delete(current_entry);

    vevent_queue_vevent(vevent_new(VEVENT_READER_REMOVE, reader, NULL));

    return VREADER_OK;

}

/*

 * Generate VEVENT_CARD_INSERT or VEVENT_CARD_REMOVE based on vreader

 * state. Separated from vreader_insert_card to allow replaying events

 * for a given state.

 */

void

vreader_queue_card_event(VReader *reader)

{

    vevent_queue_vevent(vevent_new(

        reader->card ? VEVENT_CARD_INSERT : VEVENT_CARD_REMOVE, reader,

        reader->card));

}

/*

 * insert/remove a new card. for removal, card == NULL

 */

VReaderStatus

vreader_insert_card(VReader *reader, VCard *card)

{

    vreader_lock(reader);

    if (reader->card) {

        /* decrement reference count */

        vcard_free(reader->card);

        reader->card = NULL;

    }

    reader->card = vcard_reference(card);

    vreader_unlock(reader);

    vreader_queue_card_event(reader);

    return VREADER_OK;

}

/*

 * initialize all the static reader structures

 */

void

vreader_init(void)

{

    vreader_list_init();

}