libcacard/vreader.c

   1 /*
   2  * emulate the reader
   3  *
   4  * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
   5  * See the COPYING.LIB file in the top-level directory.
   6  */
   7
   8 #include "qemu-common.h"
   9 #include "qemu/thread.h"
  10
  11 #include "vcard.h"
  12 #include "vcard_emul.h"
  13 #include "card_7816.h"
  14 #include "vreader.h"
  15 #include "vevent.h"
  16
  17 struct VReaderStruct {
  18     int    reference_count;
  19     VCard *card;
  20     char *name;
  21     vreader_id_t id;
  22     QemuMutex lock;
  23     VReaderEmul  *reader_private;
  24     VReaderEmulFree reader_private_free;
  25 };
  26
  27 /* manage locking */
  28 static inline void
  29 vreader_lock(VReader *reader)
  30 {
  31     qemu_mutex_lock(&reader->lock);
  32 }
  33
  34 static inline void
  35 vreader_unlock(VReader *reader)
  36 {
  37     qemu_mutex_unlock(&reader->lock);
  38 }
  39
  40 /*
  41  * vreader constructor
  42  */
  43 VReader *
  44 vreader_new(const char *name, VReaderEmul *private,
  45             VReaderEmulFree private_free)
  46 {
  47     VReader *reader;
  48
  49     reader = (VReader *)g_malloc(sizeof(VReader));
  50     qemu_mutex_init(&reader->lock);
  51     reader->reference_count = 1;
  52     reader->name = name ? strdup(name) : NULL;
  53     reader->card = NULL;
  54     reader->id = (vreader_id_t)-1;
  55     reader->reader_private = private;
  56     reader->reader_private_free = private_free;
  57     return reader;
  58 }
  59
  60 /* get a reference */
  61 VReader*
  62 vreader_reference(VReader *reader)
  63 {
  64     if (reader == NULL) {
  65         return NULL;
  66     }
  67     vreader_lock(reader);
  68     reader->reference_count++;
  69     vreader_unlock(reader);
  70     return reader;
  71 }
  72
  73 /* free a reference */
  74 void
  75 vreader_free(VReader *reader)
  76 {
  77     if (reader == NULL) {
  78         return;
  79     }
  80     vreader_lock(reader);
  81     if (reader->reference_count-- > 1) {
  82         vreader_unlock(reader);
  83         return;
  84     }
  85     vreader_unlock(reader);
  86     if (reader->card) {
  87         vcard_free(reader->card);
  88     }
  89     if (reader->name) {
  90         g_free(reader->name);
  91     }
  92     if (reader->reader_private_free) {
  93         reader->reader_private_free(reader->reader_private);
  94     }
  95     g_free(reader);
  96 }
  97
  98 static VCard *
  99 vreader_get_card(VReader *reader)
 100 {
 101     VCard *card;
 102
 103     vreader_lock(reader);
 104     card = vcard_reference(reader->card);
 105     vreader_unlock(reader);
 106     return card;
 107 }
 108
 109 VReaderStatus
 110 vreader_card_is_present(VReader *reader)
 111 {
 112     VCard *card = vreader_get_card(reader);
 113
 114     if (card == NULL) {
 115         return VREADER_NO_CARD;
 116     }
 117     vcard_free(card);
 118     return VREADER_OK;
 119 }
 120
 121 vreader_id_t
 122 vreader_get_id(VReader *reader)
 123 {
 124     if (reader == NULL) {
 125         return (vreader_id_t)-1;
 126     }
 127     return reader->id;
 128 }
 129
 130 VReaderStatus
 131 vreader_set_id(VReader *reader, vreader_id_t id)
 132 {
 133     if (reader == NULL) {
 134         return VREADER_NO_CARD;
 135     }
 136     reader->id = id;
 137     return VREADER_OK;
 138 }
 139
 140 const char *
 141 vreader_get_name(VReader *reader)
 142 {
 143     if (reader == NULL) {
 144         return NULL;
 145     }
 146     return reader->name;
 147 }
 148
 149 VReaderEmul *
 150 vreader_get_private(VReader *reader)
 151 {
 152     return reader->reader_private;
 153 }
 154
 155 static VReaderStatus
 156 vreader_reset(VReader *reader, VCardPower power, unsigned char *atr, int *len)
 157 {
 158     VCard *card = vreader_get_card(reader);
 159
 160     if (card == NULL) {
 161         return VREADER_NO_CARD;
 162     }
 163     /*
 164      * clean up our state
 165      */
 166     vcard_reset(card, power);
 167     if (atr) {
 168         vcard_get_atr(card, atr, len);
 169     }
 170     vcard_free(card); /* free our reference */
 171     return VREADER_OK;
 172 }
 173
 174 VReaderStatus
 175 vreader_power_on(VReader *reader, unsigned char *atr, int *len)
 176 {
 177     return vreader_reset(reader, VCARD_POWER_ON, atr, len);
 178 }
 179
 180 VReaderStatus
 181 vreader_power_off(VReader *reader)
 182 {
 183     return vreader_reset(reader, VCARD_POWER_OFF, NULL, 0);
 184 }
 185
 186
 187 VReaderStatus
 188 vreader_xfr_bytes(VReader *reader,
 189                   unsigned char *send_buf, int send_buf_len,
 190                   unsigned char *receive_buf, int *receive_buf_len)
 191 {
 192     VCardAPDU *apdu;
 193     VCardResponse *response = NULL;
 194     VCardStatus card_status;
 195     unsigned short status;
 196     VCard *card = vreader_get_card(reader);
 197
 198     if (card == NULL) {
 199         return VREADER_NO_CARD;
 200     }
 201
 202     apdu = vcard_apdu_new(send_buf, send_buf_len, &status);
 203     if (apdu == NULL) {
 204         response = vcard_make_response(status);
 205         card_status = VCARD_DONE;
 206     } else {
 207         card_status = vcard_process_apdu(card, apdu, &response);
 208     }
 209     assert(card_status == VCARD_DONE);
 210     if (card_status == VCARD_DONE) {
 211         int size = MIN(*receive_buf_len, response->b_total_len);
 212         memcpy(receive_buf, response->b_data, size);
 213         *receive_buf_len = size;
 214     }
 215     vcard_response_delete(response);
 216     vcard_apdu_delete(apdu);
 217     vcard_free(card); /* free our reference */
 218     return VREADER_OK;
 219 }
 220
 221 struct VReaderListStruct {
 222     VReaderListEntry *head;
 223     VReaderListEntry *tail;
 224 };
 225
 226 struct VReaderListEntryStruct {
 227     VReaderListEntry *next;
 228     VReaderListEntry *prev;
 229     VReader *reader;
 230 };
 231
 232
 233 static VReaderListEntry *
 234 vreader_list_entry_new(VReader *reader)
 235 {
 236     VReaderListEntry *new_reader_list_entry;
 237
 238     new_reader_list_entry = (VReaderListEntry *)
 239                                g_malloc(sizeof(VReaderListEntry));
 240     new_reader_list_entry->next = NULL;
 241     new_reader_list_entry->prev = NULL;
 242     new_reader_list_entry->reader = vreader_reference(reader);
 243     return new_reader_list_entry;
 244 }
 245
 246 static void
 247 vreader_list_entry_delete(VReaderListEntry *entry)
 248 {
 249     if (entry == NULL) {
 250         return;
 251     }
 252     vreader_free(entry->reader);
 253     g_free(entry);
 254 }
 255
 256
 257 static VReaderList *
 258 vreader_list_new(void)
 259 {
 260     VReaderList *new_reader_list;
 261
 262     new_reader_list = (VReaderList *)g_malloc(sizeof(VReaderList));
 263     new_reader_list->head = NULL;
 264     new_reader_list->tail = NULL;
 265     return new_reader_list;
 266 }
 267
 268 void
 269 vreader_list_delete(VReaderList *list)
 270 {
 271     VReaderListEntry *current_entry;
 272     VReaderListEntry *next_entry = NULL;
 273     for (current_entry = vreader_list_get_first(list); current_entry;
 274          current_entry = next_entry) {
 275         next_entry = vreader_list_get_next(current_entry);
 276         vreader_list_entry_delete(current_entry);
 277     }
 278     list->head = NULL;
 279     list->tail = NULL;
 280     g_free(list);
 281 }
 282
 283
 284 VReaderListEntry *
 285 vreader_list_get_first(VReaderList *list)
 286 {
 287     return list ? list->head : NULL;
 288 }
 289
 290 VReaderListEntry *
 291 vreader_list_get_next(VReaderListEntry *current)
 292 {
 293     return current ? current->next : NULL;
 294 }
 295
 296 VReader *
 297 vreader_list_get_reader(VReaderListEntry *entry)
 298 {
 299     return entry ? vreader_reference(entry->reader) : NULL;
 300 }
 301
 302 static void
 303 vreader_queue(VReaderList *list, VReaderListEntry *entry)
 304 {
 305     if (entry == NULL) {
 306         return;
 307     }
 308     entry->next = NULL;
 309     entry->prev = list->tail;
 310     if (list->head) {
 311         list->tail->next = entry;
 312     } else {
 313         list->head = entry;
 314     }
 315     list->tail = entry;
 316 }
 317
 318 static void
 319 vreader_dequeue(VReaderList *list, VReaderListEntry *entry)
 320 {
 321     if (entry == NULL) {
 322         return;
 323     }
 324     if (entry->next == NULL) {
 325         list->tail = entry->prev;
 326     } else if (entry->prev == NULL) {
 327         list->head = entry->next;
 328     } else {
 329         entry->prev->next = entry->next;
 330         entry->next->prev = entry->prev;
 331     }
 332     if ((list->tail == NULL) || (list->head == NULL)) {
 333         list->head = list->tail = NULL;
 334     }
 335     entry->next = entry->prev = NULL;
 336 }
 337
 338 static VReaderList *vreader_list;
 339 static QemuMutex vreader_list_mutex;
 340
 341 static void
 342 vreader_list_init(void)
 343 {
 344     vreader_list = vreader_list_new();
 345     qemu_mutex_init(&vreader_list_mutex);
 346 }
 347
 348 static void
 349 vreader_list_lock(void)
 350 {
 351     qemu_mutex_lock(&vreader_list_mutex);
 352 }
 353
 354 static void
 355 vreader_list_unlock(void)
 356 {
 357     qemu_mutex_unlock(&vreader_list_mutex);
 358 }
 359
 360 static VReaderList *
 361 vreader_copy_list(VReaderList *list)
 362 {
 363     VReaderList *new_list = NULL;
 364     VReaderListEntry *current_entry = NULL;
 365
 366     new_list = vreader_list_new();
 367     if (new_list == NULL) {
 368         return NULL;
 369     }
 370     for (current_entry = vreader_list_get_first(list); current_entry;
 371          current_entry = vreader_list_get_next(current_entry)) {
 372         VReader *reader = vreader_list_get_reader(current_entry);
 373         VReaderListEntry *new_entry = vreader_list_entry_new(reader);
 374
 375         vreader_free(reader);
 376         vreader_queue(new_list, new_entry);
 377     }
 378     return new_list;
 379 }
 380
 381 VReaderList *
 382 vreader_get_reader_list(void)
 383 {
 384     VReaderList *new_reader_list;
 385
 386     vreader_list_lock();
 387     new_reader_list = vreader_copy_list(vreader_list);
 388     vreader_list_unlock();
 389     return new_reader_list;
 390 }
 391
 392 VReader *
 393 vreader_get_reader_by_id(vreader_id_t id)
 394 {
 395     VReader *reader = NULL;
 396     VReaderListEntry *current_entry = NULL;
 397
 398     if (id == (vreader_id_t) -1) {
 399         return NULL;
 400     }
 401
 402     vreader_list_lock();
 403     for (current_entry = vreader_list_get_first(vreader_list); current_entry;
 404             current_entry = vreader_list_get_next(current_entry)) {
 405         VReader *creader = vreader_list_get_reader(current_entry);
 406         if (creader->id == id) {
 407             reader = creader;
 408             break;
 409         }
 410         vreader_free(creader);
 411     }
 412     vreader_list_unlock();
 413     return reader;
 414 }
 415
 416 VReader *
 417 vreader_get_reader_by_name(const char *name)
 418 {
 419     VReader *reader = NULL;
 420     VReaderListEntry *current_entry = NULL;
 421
 422     vreader_list_lock();
 423     for (current_entry = vreader_list_get_first(vreader_list); current_entry;
 424             current_entry = vreader_list_get_next(current_entry)) {
 425         VReader *creader = vreader_list_get_reader(current_entry);
 426         if (strcmp(creader->name, name) == 0) {
 427             reader = creader;
 428             break;
 429         }
 430         vreader_free(creader);
 431     }
 432     vreader_list_unlock();
 433     return reader;
 434 }
 435
 436 /* called from card_emul to initialize the readers */
 437 VReaderStatus
 438 vreader_add_reader(VReader *reader)
 439 {
 440     VReaderListEntry *reader_entry;
 441
 442     reader_entry = vreader_list_entry_new(reader);
 443     if (reader_entry == NULL) {
 444         return VREADER_OUT_OF_MEMORY;
 445     }
 446     vreader_list_lock();
 447     vreader_queue(vreader_list, reader_entry);
 448     vreader_list_unlock();
 449     vevent_queue_vevent(vevent_new(VEVENT_READER_INSERT, reader, NULL));
 450     return VREADER_OK;
 451 }
 452
 453
 454 VReaderStatus
 455 vreader_remove_reader(VReader *reader)
 456 {
 457     VReaderListEntry *current_entry;
 458
 459     vreader_list_lock();
 460     for (current_entry = vreader_list_get_first(vreader_list); current_entry;
 461          current_entry = vreader_list_get_next(current_entry)) {
 462         if (current_entry->reader == reader) {
 463             break;
 464         }
 465     }
 466     vreader_dequeue(vreader_list, current_entry);
 467     vreader_list_unlock();
 468     vreader_list_entry_delete(current_entry);
 469     vevent_queue_vevent(vevent_new(VEVENT_READER_REMOVE, reader, NULL));
 470     return VREADER_OK;
 471 }
 472
 473 /*
 474  * Generate VEVENT_CARD_INSERT or VEVENT_CARD_REMOVE based on vreader
 475  * state. Separated from vreader_insert_card to allow replaying events
 476  * for a given state.
 477  */
 478 void
 479 vreader_queue_card_event(VReader *reader)
 480 {
 481     vevent_queue_vevent(vevent_new(
 482         reader->card ? VEVENT_CARD_INSERT : VEVENT_CARD_REMOVE, reader,
 483         reader->card));
 484 }
 485
 486 /*
 487  * insert/remove a new card. for removal, card == NULL
 488  */
 489 VReaderStatus
 490 vreader_insert_card(VReader *reader, VCard *card)
 491 {
 492     vreader_lock(reader);
 493     if (reader->card) {
 494         /* decrement reference count */
 495         vcard_free(reader->card);
 496         reader->card = NULL;
 497     }
 498     reader->card = vcard_reference(card);
 499     vreader_unlock(reader);
 500     vreader_queue_card_event(reader);
 501     return VREADER_OK;
 502 }
 503
 504 /*
 505  * initialize all the static reader structures
 506  */
 507 void
 508 vreader_init(void)
 509 {
 510     vreader_list_init();
 511 }
 512