block/curl.c

   1 /*
   2  * QEMU Block driver for CURL images
   3  *
   4  * Copyright (c) 2009 Alexander Graf <[email protected]>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "qemu-common.h"
  25 #include "block/block_int.h"
  26 #include <curl/curl.h>
  27
  28 // #define DEBUG
  29 // #define DEBUG_VERBOSE
  30
  31 #ifdef DEBUG_CURL
  32 #define DPRINTF(fmt, ...) do { printf(fmt, ## __VA_ARGS__); } while (0)
  33 #else
  34 #define DPRINTF(fmt, ...) do { } while (0)
  35 #endif
  36
  37 #if LIBCURL_VERSION_NUM >= 0x071000
  38 /* The multi interface timer callback was introduced in 7.16.0 */
  39 #define NEED_CURL_TIMER_CALLBACK
  40 #endif
  41
  42 #define PROTOCOLS (CURLPROTO_HTTP | CURLPROTO_HTTPS | \
  43                    CURLPROTO_FTP | CURLPROTO_FTPS | \
  44                    CURLPROTO_TFTP)
  45
  46 #define CURL_NUM_STATES 8
  47 #define CURL_NUM_ACB    8
  48 #define SECTOR_SIZE     512
  49 #define READ_AHEAD_SIZE (256 * 1024)
  50
  51 #define FIND_RET_NONE   0
  52 #define FIND_RET_OK     1
  53 #define FIND_RET_WAIT   2
  54
  55 struct BDRVCURLState;
  56
  57 typedef struct CURLAIOCB {
  58     BlockDriverAIOCB common;
  59     QEMUBH *bh;
  60     QEMUIOVector *qiov;
  61
  62     int64_t sector_num;
  63     int nb_sectors;
  64
  65     size_t start;
  66     size_t end;
  67 } CURLAIOCB;
  68
  69 typedef struct CURLState
  70 {
  71     struct BDRVCURLState *s;
  72     CURLAIOCB *acb[CURL_NUM_ACB];
  73     CURL *curl;
  74     char *orig_buf;
  75     size_t buf_start;
  76     size_t buf_off;
  77     size_t buf_len;
  78     char range[128];
  79     char errmsg[CURL_ERROR_SIZE];
  80     char in_use;
  81 } CURLState;
  82
  83 typedef struct BDRVCURLState {
  84     CURLM *multi;
  85     QEMUTimer timer;
  86     size_t len;
  87     CURLState states[CURL_NUM_STATES];
  88     char *url;
  89     size_t readahead_size;
  90     bool accept_range;
  91 } BDRVCURLState;
  92
  93 static void curl_clean_state(CURLState *s);
  94 static void curl_multi_do(void *arg);
  95
  96 #ifdef NEED_CURL_TIMER_CALLBACK
  97 static int curl_timer_cb(CURLM *multi, long timeout_ms, void *opaque)
  98 {
  99     BDRVCURLState *s = opaque;
 100
 101     DPRINTF("CURL: timer callback timeout_ms %ld\n", timeout_ms);
 102     if (timeout_ms == -1) {
 103         timer_del(&s->timer);
 104     } else {
 105         int64_t timeout_ns = (int64_t)timeout_ms * 1000 * 1000;
 106         timer_mod(&s->timer,
 107                   qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + timeout_ns);
 108     }
 109     return 0;
 110 }
 111 #endif
 112
 113 static int curl_sock_cb(CURL *curl, curl_socket_t fd, int action,
 114                         void *s, void *sp)
 115 {
 116     DPRINTF("CURL (AIO): Sock action %d on fd %d\n", action, fd);
 117     switch (action) {
 118         case CURL_POLL_IN:
 119             qemu_aio_set_fd_handler(fd, curl_multi_do, NULL, s);
 120             break;
 121         case CURL_POLL_OUT:
 122             qemu_aio_set_fd_handler(fd, NULL, curl_multi_do, s);
 123             break;
 124         case CURL_POLL_INOUT:
 125             qemu_aio_set_fd_handler(fd, curl_multi_do, curl_multi_do, s);
 126             break;
 127         case CURL_POLL_REMOVE:
 128             qemu_aio_set_fd_handler(fd, NULL, NULL, NULL);
 129             break;
 130     }
 131
 132     return 0;
 133 }
 134
 135 static size_t curl_header_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
 136 {
 137     BDRVCURLState *s = opaque;
 138     size_t realsize = size * nmemb;
 139     const char *accept_line = "Accept-Ranges: bytes";
 140
 141     if (realsize >= strlen(accept_line)
 142         && strncmp((char *)ptr, accept_line, strlen(accept_line)) == 0) {
 143         s->accept_range = true;
 144     }
 145
 146     return realsize;
 147 }
 148
 149 static size_t curl_read_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
 150 {
 151     CURLState *s = ((CURLState*)opaque);
 152     size_t realsize = size * nmemb;
 153     int i;
 154
 155     DPRINTF("CURL: Just reading %zd bytes\n", realsize);
 156
 157     if (!s || !s->orig_buf)
 158         goto read_end;
 159
 160     if (s->buf_off >= s->buf_len) {
 161         /* buffer full, read nothing */
 162         return 0;
 163     }
 164     realsize = MIN(realsize, s->buf_len - s->buf_off);
 165     memcpy(s->orig_buf + s->buf_off, ptr, realsize);
 166     s->buf_off += realsize;
 167
 168     for(i=0; i<CURL_NUM_ACB; i++) {
 169         CURLAIOCB *acb = s->acb[i];
 170
 171         if (!acb)
 172             continue;
 173
 174         if ((s->buf_off >= acb->end)) {
 175             qemu_iovec_from_buf(acb->qiov, 0, s->orig_buf + acb->start,
 176                                 acb->end - acb->start);
 177             acb->common.cb(acb->common.opaque, 0);
 178             qemu_aio_release(acb);
 179             s->acb[i] = NULL;
 180         }
 181     }
 182
 183 read_end:
 184     return realsize;
 185 }
 186
 187 static int curl_find_buf(BDRVCURLState *s, size_t start, size_t len,
 188                          CURLAIOCB *acb)
 189 {
 190     int i;
 191     size_t end = start + len;
 192
 193     for (i=0; i<CURL_NUM_STATES; i++) {
 194         CURLState *state = &s->states[i];
 195         size_t buf_end = (state->buf_start + state->buf_off);
 196         size_t buf_fend = (state->buf_start + state->buf_len);
 197
 198         if (!state->orig_buf)
 199             continue;
 200         if (!state->buf_off)
 201             continue;
 202
 203         // Does the existing buffer cover our section?
 204         if ((start >= state->buf_start) &&
 205             (start <= buf_end) &&
 206             (end >= state->buf_start) &&
 207             (end <= buf_end))
 208         {
 209             char *buf = state->orig_buf + (start - state->buf_start);
 210
 211             qemu_iovec_from_buf(acb->qiov, 0, buf, len);
 212             acb->common.cb(acb->common.opaque, 0);
 213
 214             return FIND_RET_OK;
 215         }
 216
 217         // Wait for unfinished chunks
 218         if ((start >= state->buf_start) &&
 219             (start <= buf_fend) &&
 220             (end >= state->buf_start) &&
 221             (end <= buf_fend))
 222         {
 223             int j;
 224
 225             acb->start = start - state->buf_start;
 226             acb->end = acb->start + len;
 227
 228             for (j=0; j<CURL_NUM_ACB; j++) {
 229                 if (!state->acb[j]) {
 230                     state->acb[j] = acb;
 231                     return FIND_RET_WAIT;
 232                 }
 233             }
 234         }
 235     }
 236
 237     return FIND_RET_NONE;
 238 }
 239
 240 static void curl_multi_read(BDRVCURLState *s)
 241 {
 242     int msgs_in_queue;
 243
 244     /* Try to find done transfers, so we can free the easy
 245      * handle again. */
 246     do {
 247         CURLMsg *msg;
 248         msg = curl_multi_info_read(s->multi, &msgs_in_queue);
 249
 250         if (!msg)
 251             break;
 252         if (msg->msg == CURLMSG_NONE)
 253             break;
 254
 255         switch (msg->msg) {
 256             case CURLMSG_DONE:
 257             {
 258                 CURLState *state = NULL;
 259                 curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE,
 260                                   (char **)&state);
 261
 262                 /* ACBs for successful messages get completed in curl_read_cb */
 263                 if (msg->data.result != CURLE_OK) {
 264                     int i;
 265                     for (i = 0; i < CURL_NUM_ACB; i++) {
 266                         CURLAIOCB *acb = state->acb[i];
 267
 268                         if (acb == NULL) {
 269                             continue;
 270                         }
 271
 272                         acb->common.cb(acb->common.opaque, -EIO);
 273                         qemu_aio_release(acb);
 274                         state->acb[i] = NULL;
 275                     }
 276                 }
 277
 278                 curl_clean_state(state);
 279                 break;
 280             }
 281             default:
 282                 msgs_in_queue = 0;
 283                 break;
 284         }
 285     } while(msgs_in_queue);
 286 }
 287
 288 static void curl_multi_do(void *arg)
 289 {
 290     BDRVCURLState *s = (BDRVCURLState *)arg;
 291     int running;
 292     int r;
 293
 294     if (!s->multi) {
 295         return;
 296     }
 297
 298     do {
 299         r = curl_multi_socket_all(s->multi, &running);
 300     } while(r == CURLM_CALL_MULTI_PERFORM);
 301
 302     curl_multi_read(s);
 303 }
 304
 305 static void curl_multi_timeout_do(void *arg)
 306 {
 307 #ifdef NEED_CURL_TIMER_CALLBACK
 308     BDRVCURLState *s = (BDRVCURLState *)arg;
 309     int running;
 310
 311     if (!s->multi) {
 312         return;
 313     }
 314
 315     curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running);
 316
 317     curl_multi_read(s);
 318 #else
 319     abort();
 320 #endif
 321 }
 322
 323 static CURLState *curl_init_state(BDRVCURLState *s)
 324 {
 325     CURLState *state = NULL;
 326     int i, j;
 327
 328     do {
 329         for (i=0; i<CURL_NUM_STATES; i++) {
 330             for (j=0; j<CURL_NUM_ACB; j++)
 331                 if (s->states[i].acb[j])
 332                     continue;
 333             if (s->states[i].in_use)
 334                 continue;
 335
 336             state = &s->states[i];
 337             state->in_use = 1;
 338             break;
 339         }
 340         if (!state) {
 341             g_usleep(100);
 342             curl_multi_do(s);
 343         }
 344     } while(!state);
 345
 346     if (state->curl)
 347         goto has_curl;
 348
 349     state->curl = curl_easy_init();
 350     if (!state->curl)
 351         return NULL;
 352     curl_easy_setopt(state->curl, CURLOPT_URL, s->url);
 353     curl_easy_setopt(state->curl, CURLOPT_TIMEOUT, 5);
 354     curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION, (void *)curl_read_cb);
 355     curl_easy_setopt(state->curl, CURLOPT_WRITEDATA, (void *)state);
 356     curl_easy_setopt(state->curl, CURLOPT_PRIVATE, (void *)state);
 357     curl_easy_setopt(state->curl, CURLOPT_AUTOREFERER, 1);
 358     curl_easy_setopt(state->curl, CURLOPT_FOLLOWLOCATION, 1);
 359     curl_easy_setopt(state->curl, CURLOPT_NOSIGNAL, 1);
 360     curl_easy_setopt(state->curl, CURLOPT_ERRORBUFFER, state->errmsg);
 361     curl_easy_setopt(state->curl, CURLOPT_FAILONERROR, 1);
 362
 363     /* Restrict supported protocols to avoid security issues in the more
 364      * obscure protocols.  For example, do not allow POP3/SMTP/IMAP see
 365      * CVE-2013-0249.
 366      *
 367      * Restricting protocols is only supported from 7.19.4 upwards.
 368      */
 369 #if LIBCURL_VERSION_NUM >= 0x071304
 370     curl_easy_setopt(state->curl, CURLOPT_PROTOCOLS, PROTOCOLS);
 371     curl_easy_setopt(state->curl, CURLOPT_REDIR_PROTOCOLS, PROTOCOLS);
 372 #endif
 373
 374 #ifdef DEBUG_VERBOSE
 375     curl_easy_setopt(state->curl, CURLOPT_VERBOSE, 1);
 376 #endif
 377
 378 has_curl:
 379
 380     state->s = s;
 381
 382     return state;
 383 }
 384
 385 static void curl_clean_state(CURLState *s)
 386 {
 387     if (s->s->multi)
 388         curl_multi_remove_handle(s->s->multi, s->curl);
 389     s->in_use = 0;
 390 }
 391
 392 static void curl_parse_filename(const char *filename, QDict *options,
 393                                 Error **errp)
 394 {
 395
 396     #define RA_OPTSTR ":readahead="
 397     char *file;
 398     char *ra;
 399     const char *ra_val;
 400     int parse_state = 0;
 401
 402     file = g_strdup(filename);
 403
 404     /* Parse a trailing ":readahead=#:" param, if present. */
 405     ra = file + strlen(file) - 1;
 406     while (ra >= file) {
 407         if (parse_state == 0) {
 408             if (*ra == ':') {
 409                 parse_state++;
 410             } else {
 411                 break;
 412             }
 413         } else if (parse_state == 1) {
 414             if (*ra > '9' || *ra < '0') {
 415                 char *opt_start = ra - strlen(RA_OPTSTR) + 1;
 416                 if (opt_start > file &&
 417                     strncmp(opt_start, RA_OPTSTR, strlen(RA_OPTSTR)) == 0) {
 418                     ra_val = ra + 1;
 419                     ra -= strlen(RA_OPTSTR) - 1;
 420                     *ra = '\0';
 421                     qdict_put(options, "readahead", qstring_from_str(ra_val));
 422                 }
 423                 break;
 424             }
 425         }
 426         ra--;
 427     }
 428
 429     qdict_put(options, "url", qstring_from_str(file));
 430
 431     g_free(file);
 432 }
 433
 434 static QemuOptsList runtime_opts = {
 435     .name = "curl",
 436     .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
 437     .desc = {
 438         {
 439             .name = "url",
 440             .type = QEMU_OPT_STRING,
 441             .help = "URL to open",
 442         },
 443         {
 444             .name = "readahead",
 445             .type = QEMU_OPT_SIZE,
 446             .help = "Readahead size",
 447         },
 448         { /* end of list */ }
 449     },
 450 };
 451
 452 static int curl_open(BlockDriverState *bs, QDict *options, int flags,
 453                      Error **errp)
 454 {
 455     BDRVCURLState *s = bs->opaque;
 456     CURLState *state = NULL;
 457     QemuOpts *opts;
 458     Error *local_err = NULL;
 459     const char *file;
 460     double d;
 461
 462     static int inited = 0;
 463
 464     if (flags & BDRV_O_RDWR) {
 465         error_setg(errp, "curl block device does not support writes");
 466         return -EROFS;
 467     }
 468
 469     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
 470     qemu_opts_absorb_qdict(opts, options, &local_err);
 471     if (local_err) {
 472         error_propagate(errp, local_err);
 473         goto out_noclean;
 474     }
 475
 476     s->readahead_size = qemu_opt_get_size(opts, "readahead", READ_AHEAD_SIZE);
 477     if ((s->readahead_size & 0x1ff) != 0) {
 478         error_setg(errp, "HTTP_READAHEAD_SIZE %zd is not a multiple of 512",
 479                    s->readahead_size);
 480         goto out_noclean;
 481     }
 482
 483     file = qemu_opt_get(opts, "url");
 484     if (file == NULL) {
 485         error_setg(errp, "curl block driver requires an 'url' option");
 486         goto out_noclean;
 487     }
 488
 489     if (!inited) {
 490         curl_global_init(CURL_GLOBAL_ALL);
 491         inited = 1;
 492     }
 493
 494     DPRINTF("CURL: Opening %s\n", file);
 495     s->url = g_strdup(file);
 496     state = curl_init_state(s);
 497     if (!state)
 498         goto out_noclean;
 499
 500     // Get file size
 501
 502     s->accept_range = false;
 503     curl_easy_setopt(state->curl, CURLOPT_NOBODY, 1);
 504     curl_easy_setopt(state->curl, CURLOPT_HEADERFUNCTION,
 505                      curl_header_cb);
 506     curl_easy_setopt(state->curl, CURLOPT_HEADERDATA, s);
 507     if (curl_easy_perform(state->curl))
 508         goto out;
 509     curl_easy_getinfo(state->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &d);
 510     if (d)
 511         s->len = (size_t)d;
 512     else if(!s->len)
 513         goto out;
 514     if ((!strncasecmp(s->url, "http://", strlen("http://"))
 515         || !strncasecmp(s->url, "https://", strlen("https://")))
 516         && !s->accept_range) {
 517         pstrcpy(state->errmsg, CURL_ERROR_SIZE,
 518                 "Server does not support 'range' (byte ranges).");
 519         goto out;
 520     }
 521     DPRINTF("CURL: Size = %zd\n", s->len);
 522
 523     curl_clean_state(state);
 524     curl_easy_cleanup(state->curl);
 525     state->curl = NULL;
 526
 527     aio_timer_init(bdrv_get_aio_context(bs), &s->timer,
 528                    QEMU_CLOCK_REALTIME, SCALE_NS,
 529                    curl_multi_timeout_do, s);
 530
 531     // Now we know the file exists and its size, so let's
 532     // initialize the multi interface!
 533
 534     s->multi = curl_multi_init();
 535     curl_multi_setopt(s->multi, CURLMOPT_SOCKETDATA, s);
 536     curl_multi_setopt(s->multi, CURLMOPT_SOCKETFUNCTION, curl_sock_cb);
 537 #ifdef NEED_CURL_TIMER_CALLBACK
 538     curl_multi_setopt(s->multi, CURLMOPT_TIMERDATA, s);
 539     curl_multi_setopt(s->multi, CURLMOPT_TIMERFUNCTION, curl_timer_cb);
 540 #endif
 541     curl_multi_do(s);
 542
 543     qemu_opts_del(opts);
 544     return 0;
 545
 546 out:
 547     error_setg(errp, "CURL: Error opening file: %s", state->errmsg);
 548     curl_easy_cleanup(state->curl);
 549     state->curl = NULL;
 550 out_noclean:
 551     g_free(s->url);
 552     qemu_opts_del(opts);
 553     return -EINVAL;
 554 }
 555
 556 static void curl_aio_cancel(BlockDriverAIOCB *blockacb)
 557 {
 558     // Do we have to implement canceling? Seems to work without...
 559 }
 560
 561 static const AIOCBInfo curl_aiocb_info = {
 562     .aiocb_size         = sizeof(CURLAIOCB),
 563     .cancel             = curl_aio_cancel,
 564 };
 565
 566
 567 static void curl_readv_bh_cb(void *p)
 568 {
 569     CURLState *state;
 570
 571     CURLAIOCB *acb = p;
 572     BDRVCURLState *s = acb->common.bs->opaque;
 573
 574     qemu_bh_delete(acb->bh);
 575     acb->bh = NULL;
 576
 577     size_t start = acb->sector_num * SECTOR_SIZE;
 578     size_t end;
 579
 580     // In case we have the requested data already (e.g. read-ahead),
 581     // we can just call the callback and be done.
 582     switch (curl_find_buf(s, start, acb->nb_sectors * SECTOR_SIZE, acb)) {
 583         case FIND_RET_OK:
 584             qemu_aio_release(acb);
 585             // fall through
 586         case FIND_RET_WAIT:
 587             return;
 588         default:
 589             break;
 590     }
 591
 592     // No cache found, so let's start a new request
 593     state = curl_init_state(s);
 594     if (!state) {
 595         acb->common.cb(acb->common.opaque, -EIO);
 596         qemu_aio_release(acb);
 597         return;
 598     }
 599
 600     acb->start = 0;
 601     acb->end = (acb->nb_sectors * SECTOR_SIZE);
 602
 603     state->buf_off = 0;
 604     if (state->orig_buf)
 605         g_free(state->orig_buf);
 606     state->buf_start = start;
 607     state->buf_len = acb->end + s->readahead_size;
 608     end = MIN(start + state->buf_len, s->len) - 1;
 609     state->orig_buf = g_malloc(state->buf_len);
 610     state->acb[0] = acb;
 611
 612     snprintf(state->range, 127, "%zd-%zd", start, end);
 613     DPRINTF("CURL (AIO): Reading %d at %zd (%s)\n",
 614             (acb->nb_sectors * SECTOR_SIZE), start, state->range);
 615     curl_easy_setopt(state->curl, CURLOPT_RANGE, state->range);
 616
 617     curl_multi_add_handle(s->multi, state->curl);
 618     curl_multi_do(s);
 619
 620 }
 621
 622 static BlockDriverAIOCB *curl_aio_readv(BlockDriverState *bs,
 623         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 624         BlockDriverCompletionFunc *cb, void *opaque)
 625 {
 626     CURLAIOCB *acb;
 627
 628     acb = qemu_aio_get(&curl_aiocb_info, bs, cb, opaque);
 629
 630     acb->qiov = qiov;
 631     acb->sector_num = sector_num;
 632     acb->nb_sectors = nb_sectors;
 633
 634     acb->bh = qemu_bh_new(curl_readv_bh_cb, acb);
 635     qemu_bh_schedule(acb->bh);
 636     return &acb->common;
 637 }
 638
 639 static void curl_close(BlockDriverState *bs)
 640 {
 641     BDRVCURLState *s = bs->opaque;
 642     int i;
 643
 644     DPRINTF("CURL: Close\n");
 645     for (i=0; i<CURL_NUM_STATES; i++) {
 646         if (s->states[i].in_use)
 647             curl_clean_state(&s->states[i]);
 648         if (s->states[i].curl) {
 649             curl_easy_cleanup(s->states[i].curl);
 650             s->states[i].curl = NULL;
 651         }
 652         if (s->states[i].orig_buf) {
 653             g_free(s->states[i].orig_buf);
 654             s->states[i].orig_buf = NULL;
 655         }
 656     }
 657     if (s->multi)
 658         curl_multi_cleanup(s->multi);
 659
 660     timer_del(&s->timer);
 661
 662     g_free(s->url);
 663 }
 664
 665 static int64_t curl_getlength(BlockDriverState *bs)
 666 {
 667     BDRVCURLState *s = bs->opaque;
 668     return s->len;
 669 }
 670
 671 static BlockDriver bdrv_http = {
 672     .format_name            = "http",
 673     .protocol_name          = "http",
 674
 675     .instance_size          = sizeof(BDRVCURLState),
 676     .bdrv_parse_filename    = curl_parse_filename,
 677     .bdrv_file_open         = curl_open,
 678     .bdrv_close             = curl_close,
 679     .bdrv_getlength         = curl_getlength,
 680
 681     .bdrv_aio_readv         = curl_aio_readv,
 682 };
 683
 684 static BlockDriver bdrv_https = {
 685     .format_name            = "https",
 686     .protocol_name          = "https",
 687
 688     .instance_size          = sizeof(BDRVCURLState),
 689     .bdrv_parse_filename    = curl_parse_filename,
 690     .bdrv_file_open         = curl_open,
 691     .bdrv_close             = curl_close,
 692     .bdrv_getlength         = curl_getlength,
 693
 694     .bdrv_aio_readv         = curl_aio_readv,
 695 };
 696
 697 static BlockDriver bdrv_ftp = {
 698     .format_name            = "ftp",
 699     .protocol_name          = "ftp",
 700
 701     .instance_size          = sizeof(BDRVCURLState),
 702     .bdrv_parse_filename    = curl_parse_filename,
 703     .bdrv_file_open         = curl_open,
 704     .bdrv_close             = curl_close,
 705     .bdrv_getlength         = curl_getlength,
 706
 707     .bdrv_aio_readv         = curl_aio_readv,
 708 };
 709
 710 static BlockDriver bdrv_ftps = {
 711     .format_name            = "ftps",
 712     .protocol_name          = "ftps",
 713
 714     .instance_size          = sizeof(BDRVCURLState),
 715     .bdrv_parse_filename    = curl_parse_filename,
 716     .bdrv_file_open         = curl_open,
 717     .bdrv_close             = curl_close,
 718     .bdrv_getlength         = curl_getlength,
 719
 720     .bdrv_aio_readv         = curl_aio_readv,
 721 };
 722
 723 static BlockDriver bdrv_tftp = {
 724     .format_name            = "tftp",
 725     .protocol_name          = "tftp",
 726
 727     .instance_size          = sizeof(BDRVCURLState),
 728     .bdrv_parse_filename    = curl_parse_filename,
 729     .bdrv_file_open         = curl_open,
 730     .bdrv_close             = curl_close,
 731     .bdrv_getlength         = curl_getlength,
 732
 733     .bdrv_aio_readv         = curl_aio_readv,
 734 };
 735
 736 static void curl_block_init(void)
 737 {
 738     bdrv_register(&bdrv_http);
 739     bdrv_register(&bdrv_https);
 740     bdrv_register(&bdrv_ftp);
 741     bdrv_register(&bdrv_ftps);
 742     bdrv_register(&bdrv_tftp);
 743 }
 744
 745 block_init(curl_block_init);