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         return 0;
 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     return realsize;
 184 }
 185
 186 static int curl_find_buf(BDRVCURLState *s, size_t start, size_t len,
 187                          CURLAIOCB *acb)
 188 {
 189     int i;
 190     size_t end = start + len;
 191
 192     for (i=0; i<CURL_NUM_STATES; i++) {
 193         CURLState *state = &s->states[i];
 194         size_t buf_end = (state->buf_start + state->buf_off);
 195         size_t buf_fend = (state->buf_start + state->buf_len);
 196
 197         if (!state->orig_buf)
 198             continue;
 199         if (!state->buf_off)
 200             continue;
 201
 202         // Does the existing buffer cover our section?
 203         if ((start >= state->buf_start) &&
 204             (start <= buf_end) &&
 205             (end >= state->buf_start) &&
 206             (end <= buf_end))
 207         {
 208             char *buf = state->orig_buf + (start - state->buf_start);
 209
 210             qemu_iovec_from_buf(acb->qiov, 0, buf, len);
 211             acb->common.cb(acb->common.opaque, 0);
 212
 213             return FIND_RET_OK;
 214         }
 215
 216         // Wait for unfinished chunks
 217         if ((start >= state->buf_start) &&
 218             (start <= buf_fend) &&
 219             (end >= state->buf_start) &&
 220             (end <= buf_fend))
 221         {
 222             int j;
 223
 224             acb->start = start - state->buf_start;
 225             acb->end = acb->start + len;
 226
 227             for (j=0; j<CURL_NUM_ACB; j++) {
 228                 if (!state->acb[j]) {
 229                     state->acb[j] = acb;
 230                     return FIND_RET_WAIT;
 231                 }
 232             }
 233         }
 234     }
 235
 236     return FIND_RET_NONE;
 237 }
 238
 239 static void curl_multi_read(BDRVCURLState *s)
 240 {
 241     int msgs_in_queue;
 242
 243     /* Try to find done transfers, so we can free the easy
 244      * handle again. */
 245     do {
 246         CURLMsg *msg;
 247         msg = curl_multi_info_read(s->multi, &msgs_in_queue);
 248
 249         if (!msg)
 250             break;
 251         if (msg->msg == CURLMSG_NONE)
 252             break;
 253
 254         switch (msg->msg) {
 255             case CURLMSG_DONE:
 256             {
 257                 CURLState *state = NULL;
 258                 curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE,
 259                                   (char **)&state);
 260
 261                 /* ACBs for successful messages get completed in curl_read_cb */
 262                 if (msg->data.result != CURLE_OK) {
 263                     int i;
 264                     for (i = 0; i < CURL_NUM_ACB; i++) {
 265                         CURLAIOCB *acb = state->acb[i];
 266
 267                         if (acb == NULL) {
 268                             continue;
 269                         }
 270
 271                         acb->common.cb(acb->common.opaque, -EIO);
 272                         qemu_aio_release(acb);
 273                         state->acb[i] = NULL;
 274                     }
 275                 }
 276
 277                 curl_clean_state(state);
 278                 break;
 279             }
 280             default:
 281                 msgs_in_queue = 0;
 282                 break;
 283         }
 284     } while(msgs_in_queue);
 285 }
 286
 287 static void curl_multi_do(void *arg)
 288 {
 289     BDRVCURLState *s = (BDRVCURLState *)arg;
 290     int running;
 291     int r;
 292
 293     if (!s->multi) {
 294         return;
 295     }
 296
 297     do {
 298         r = curl_multi_socket_all(s->multi, &running);
 299     } while(r == CURLM_CALL_MULTI_PERFORM);
 300
 301     curl_multi_read(s);
 302 }
 303
 304 static void curl_multi_timeout_do(void *arg)
 305 {
 306 #ifdef NEED_CURL_TIMER_CALLBACK
 307     BDRVCURLState *s = (BDRVCURLState *)arg;
 308     int running;
 309
 310     if (!s->multi) {
 311         return;
 312     }
 313
 314     curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running);
 315
 316     curl_multi_read(s);
 317 #else
 318     abort();
 319 #endif
 320 }
 321
 322 static CURLState *curl_init_state(BDRVCURLState *s)
 323 {
 324     CURLState *state = NULL;
 325     int i, j;
 326
 327     do {
 328         for (i=0; i<CURL_NUM_STATES; i++) {
 329             for (j=0; j<CURL_NUM_ACB; j++)
 330                 if (s->states[i].acb[j])
 331                     continue;
 332             if (s->states[i].in_use)
 333                 continue;
 334
 335             state = &s->states[i];
 336             state->in_use = 1;
 337             break;
 338         }
 339         if (!state) {
 340             g_usleep(100);
 341             curl_multi_do(s);
 342         }
 343     } while(!state);
 344
 345     if (!state->curl) {
 346         state->curl = curl_easy_init();
 347         if (!state->curl) {
 348             return NULL;
 349         }
 350         curl_easy_setopt(state->curl, CURLOPT_URL, s->url);
 351         curl_easy_setopt(state->curl, CURLOPT_TIMEOUT, 5);
 352         curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION,
 353                          (void *)curl_read_cb);
 354         curl_easy_setopt(state->curl, CURLOPT_WRITEDATA, (void *)state);
 355         curl_easy_setopt(state->curl, CURLOPT_PRIVATE, (void *)state);
 356         curl_easy_setopt(state->curl, CURLOPT_AUTOREFERER, 1);
 357         curl_easy_setopt(state->curl, CURLOPT_FOLLOWLOCATION, 1);
 358         curl_easy_setopt(state->curl, CURLOPT_NOSIGNAL, 1);
 359         curl_easy_setopt(state->curl, CURLOPT_ERRORBUFFER, state->errmsg);
 360         curl_easy_setopt(state->curl, CURLOPT_FAILONERROR, 1);
 361
 362         /* Restrict supported protocols to avoid security issues in the more
 363          * obscure protocols.  For example, do not allow POP3/SMTP/IMAP see
 364          * CVE-2013-0249.
 365          *
 366          * Restricting protocols is only supported from 7.19.4 upwards.
 367          */
 368 #if LIBCURL_VERSION_NUM >= 0x071304
 369         curl_easy_setopt(state->curl, CURLOPT_PROTOCOLS, PROTOCOLS);
 370         curl_easy_setopt(state->curl, CURLOPT_REDIR_PROTOCOLS, PROTOCOLS);
 371 #endif
 372
 373 #ifdef DEBUG_VERBOSE
 374         curl_easy_setopt(state->curl, CURLOPT_VERBOSE, 1);
 375 #endif
 376     }
 377
 378     state->s = s;
 379
 380     return state;
 381 }
 382
 383 static void curl_clean_state(CURLState *s)
 384 {
 385     if (s->s->multi)
 386         curl_multi_remove_handle(s->s->multi, s->curl);
 387     s->in_use = 0;
 388 }
 389
 390 static void curl_parse_filename(const char *filename, QDict *options,
 391                                 Error **errp)
 392 {
 393
 394     #define RA_OPTSTR ":readahead="
 395     char *file;
 396     char *ra;
 397     const char *ra_val;
 398     int parse_state = 0;
 399
 400     file = g_strdup(filename);
 401
 402     /* Parse a trailing ":readahead=#:" param, if present. */
 403     ra = file + strlen(file) - 1;
 404     while (ra >= file) {
 405         if (parse_state == 0) {
 406             if (*ra == ':') {
 407                 parse_state++;
 408             } else {
 409                 break;
 410             }
 411         } else if (parse_state == 1) {
 412             if (*ra > '9' || *ra < '0') {
 413                 char *opt_start = ra - strlen(RA_OPTSTR) + 1;
 414                 if (opt_start > file &&
 415                     strncmp(opt_start, RA_OPTSTR, strlen(RA_OPTSTR)) == 0) {
 416                     ra_val = ra + 1;
 417                     ra -= strlen(RA_OPTSTR) - 1;
 418                     *ra = '\0';
 419                     qdict_put(options, "readahead", qstring_from_str(ra_val));
 420                 }
 421                 break;
 422             }
 423         }
 424         ra--;
 425     }
 426
 427     qdict_put(options, "url", qstring_from_str(file));
 428
 429     g_free(file);
 430 }
 431
 432 static QemuOptsList runtime_opts = {
 433     .name = "curl",
 434     .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
 435     .desc = {
 436         {
 437             .name = "url",
 438             .type = QEMU_OPT_STRING,
 439             .help = "URL to open",
 440         },
 441         {
 442             .name = "readahead",
 443             .type = QEMU_OPT_SIZE,
 444             .help = "Readahead size",
 445         },
 446         { /* end of list */ }
 447     },
 448 };
 449
 450 static int curl_open(BlockDriverState *bs, QDict *options, int flags,
 451                      Error **errp)
 452 {
 453     BDRVCURLState *s = bs->opaque;
 454     CURLState *state = NULL;
 455     QemuOpts *opts;
 456     Error *local_err = NULL;
 457     const char *file;
 458     double d;
 459
 460     static int inited = 0;
 461
 462     if (flags & BDRV_O_RDWR) {
 463         error_setg(errp, "curl block device does not support writes");
 464         return -EROFS;
 465     }
 466
 467     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
 468     qemu_opts_absorb_qdict(opts, options, &local_err);
 469     if (local_err) {
 470         error_propagate(errp, local_err);
 471         goto out_noclean;
 472     }
 473
 474     s->readahead_size = qemu_opt_get_size(opts, "readahead", READ_AHEAD_SIZE);
 475     if ((s->readahead_size & 0x1ff) != 0) {
 476         error_setg(errp, "HTTP_READAHEAD_SIZE %zd is not a multiple of 512",
 477                    s->readahead_size);
 478         goto out_noclean;
 479     }
 480
 481     file = qemu_opt_get(opts, "url");
 482     if (file == NULL) {
 483         error_setg(errp, "curl block driver requires an 'url' option");
 484         goto out_noclean;
 485     }
 486
 487     if (!inited) {
 488         curl_global_init(CURL_GLOBAL_ALL);
 489         inited = 1;
 490     }
 491
 492     DPRINTF("CURL: Opening %s\n", file);
 493     s->url = g_strdup(file);
 494     state = curl_init_state(s);
 495     if (!state)
 496         goto out_noclean;
 497
 498     // Get file size
 499
 500     s->accept_range = false;
 501     curl_easy_setopt(state->curl, CURLOPT_NOBODY, 1);
 502     curl_easy_setopt(state->curl, CURLOPT_HEADERFUNCTION,
 503                      curl_header_cb);
 504     curl_easy_setopt(state->curl, CURLOPT_HEADERDATA, s);
 505     if (curl_easy_perform(state->curl))
 506         goto out;
 507     curl_easy_getinfo(state->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &d);
 508     if (d)
 509         s->len = (size_t)d;
 510     else if(!s->len)
 511         goto out;
 512     if ((!strncasecmp(s->url, "http://", strlen("http://"))
 513         || !strncasecmp(s->url, "https://", strlen("https://")))
 514         && !s->accept_range) {
 515         pstrcpy(state->errmsg, CURL_ERROR_SIZE,
 516                 "Server does not support 'range' (byte ranges).");
 517         goto out;
 518     }
 519     DPRINTF("CURL: Size = %zd\n", s->len);
 520
 521     curl_clean_state(state);
 522     curl_easy_cleanup(state->curl);
 523     state->curl = NULL;
 524
 525     aio_timer_init(bdrv_get_aio_context(bs), &s->timer,
 526                    QEMU_CLOCK_REALTIME, SCALE_NS,
 527                    curl_multi_timeout_do, s);
 528
 529     // Now we know the file exists and its size, so let's
 530     // initialize the multi interface!
 531
 532     s->multi = curl_multi_init();
 533     curl_multi_setopt(s->multi, CURLMOPT_SOCKETDATA, s);
 534     curl_multi_setopt(s->multi, CURLMOPT_SOCKETFUNCTION, curl_sock_cb);
 535 #ifdef NEED_CURL_TIMER_CALLBACK
 536     curl_multi_setopt(s->multi, CURLMOPT_TIMERDATA, s);
 537     curl_multi_setopt(s->multi, CURLMOPT_TIMERFUNCTION, curl_timer_cb);
 538 #endif
 539     curl_multi_do(s);
 540
 541     qemu_opts_del(opts);
 542     return 0;
 543
 544 out:
 545     error_setg(errp, "CURL: Error opening file: %s", state->errmsg);
 546     curl_easy_cleanup(state->curl);
 547     state->curl = NULL;
 548 out_noclean:
 549     g_free(s->url);
 550     qemu_opts_del(opts);
 551     return -EINVAL;
 552 }
 553
 554 static void curl_aio_cancel(BlockDriverAIOCB *blockacb)
 555 {
 556     // Do we have to implement canceling? Seems to work without...
 557 }
 558
 559 static const AIOCBInfo curl_aiocb_info = {
 560     .aiocb_size         = sizeof(CURLAIOCB),
 561     .cancel             = curl_aio_cancel,
 562 };
 563
 564
 565 static void curl_readv_bh_cb(void *p)
 566 {
 567     CURLState *state;
 568
 569     CURLAIOCB *acb = p;
 570     BDRVCURLState *s = acb->common.bs->opaque;
 571
 572     qemu_bh_delete(acb->bh);
 573     acb->bh = NULL;
 574
 575     size_t start = acb->sector_num * SECTOR_SIZE;
 576     size_t end;
 577
 578     // In case we have the requested data already (e.g. read-ahead),
 579     // we can just call the callback and be done.
 580     switch (curl_find_buf(s, start, acb->nb_sectors * SECTOR_SIZE, acb)) {
 581         case FIND_RET_OK:
 582             qemu_aio_release(acb);
 583             // fall through
 584         case FIND_RET_WAIT:
 585             return;
 586         default:
 587             break;
 588     }
 589
 590     // No cache found, so let's start a new request
 591     state = curl_init_state(s);
 592     if (!state) {
 593         acb->common.cb(acb->common.opaque, -EIO);
 594         qemu_aio_release(acb);
 595         return;
 596     }
 597
 598     acb->start = 0;
 599     acb->end = (acb->nb_sectors * SECTOR_SIZE);
 600
 601     state->buf_off = 0;
 602     if (state->orig_buf)
 603         g_free(state->orig_buf);
 604     state->buf_start = start;
 605     state->buf_len = acb->end + s->readahead_size;
 606     end = MIN(start + state->buf_len, s->len) - 1;
 607     state->orig_buf = g_malloc(state->buf_len);
 608     state->acb[0] = acb;
 609
 610     snprintf(state->range, 127, "%zd-%zd", start, end);
 611     DPRINTF("CURL (AIO): Reading %d at %zd (%s)\n",
 612             (acb->nb_sectors * SECTOR_SIZE), start, state->range);
 613     curl_easy_setopt(state->curl, CURLOPT_RANGE, state->range);
 614
 615     curl_multi_add_handle(s->multi, state->curl);
 616     curl_multi_do(s);
 617
 618 }
 619
 620 static BlockDriverAIOCB *curl_aio_readv(BlockDriverState *bs,
 621         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 622         BlockDriverCompletionFunc *cb, void *opaque)
 623 {
 624     CURLAIOCB *acb;
 625
 626     acb = qemu_aio_get(&curl_aiocb_info, bs, cb, opaque);
 627
 628     acb->qiov = qiov;
 629     acb->sector_num = sector_num;
 630     acb->nb_sectors = nb_sectors;
 631
 632     acb->bh = qemu_bh_new(curl_readv_bh_cb, acb);
 633     qemu_bh_schedule(acb->bh);
 634     return &acb->common;
 635 }
 636
 637 static void curl_close(BlockDriverState *bs)
 638 {
 639     BDRVCURLState *s = bs->opaque;
 640     int i;
 641
 642     DPRINTF("CURL: Close\n");
 643     for (i=0; i<CURL_NUM_STATES; i++) {
 644         if (s->states[i].in_use)
 645             curl_clean_state(&s->states[i]);
 646         if (s->states[i].curl) {
 647             curl_easy_cleanup(s->states[i].curl);
 648             s->states[i].curl = NULL;
 649         }
 650         if (s->states[i].orig_buf) {
 651             g_free(s->states[i].orig_buf);
 652             s->states[i].orig_buf = NULL;
 653         }
 654     }
 655     if (s->multi)
 656         curl_multi_cleanup(s->multi);
 657
 658     timer_del(&s->timer);
 659
 660     g_free(s->url);
 661 }
 662
 663 static int64_t curl_getlength(BlockDriverState *bs)
 664 {
 665     BDRVCURLState *s = bs->opaque;
 666     return s->len;
 667 }
 668
 669 static BlockDriver bdrv_http = {
 670     .format_name            = "http",
 671     .protocol_name          = "http",
 672
 673     .instance_size          = sizeof(BDRVCURLState),
 674     .bdrv_parse_filename    = curl_parse_filename,
 675     .bdrv_file_open         = curl_open,
 676     .bdrv_close             = curl_close,
 677     .bdrv_getlength         = curl_getlength,
 678
 679     .bdrv_aio_readv         = curl_aio_readv,
 680 };
 681
 682 static BlockDriver bdrv_https = {
 683     .format_name            = "https",
 684     .protocol_name          = "https",
 685
 686     .instance_size          = sizeof(BDRVCURLState),
 687     .bdrv_parse_filename    = curl_parse_filename,
 688     .bdrv_file_open         = curl_open,
 689     .bdrv_close             = curl_close,
 690     .bdrv_getlength         = curl_getlength,
 691
 692     .bdrv_aio_readv         = curl_aio_readv,
 693 };
 694
 695 static BlockDriver bdrv_ftp = {
 696     .format_name            = "ftp",
 697     .protocol_name          = "ftp",
 698
 699     .instance_size          = sizeof(BDRVCURLState),
 700     .bdrv_parse_filename    = curl_parse_filename,
 701     .bdrv_file_open         = curl_open,
 702     .bdrv_close             = curl_close,
 703     .bdrv_getlength         = curl_getlength,
 704
 705     .bdrv_aio_readv         = curl_aio_readv,
 706 };
 707
 708 static BlockDriver bdrv_ftps = {
 709     .format_name            = "ftps",
 710     .protocol_name          = "ftps",
 711
 712     .instance_size          = sizeof(BDRVCURLState),
 713     .bdrv_parse_filename    = curl_parse_filename,
 714     .bdrv_file_open         = curl_open,
 715     .bdrv_close             = curl_close,
 716     .bdrv_getlength         = curl_getlength,
 717
 718     .bdrv_aio_readv         = curl_aio_readv,
 719 };
 720
 721 static BlockDriver bdrv_tftp = {
 722     .format_name            = "tftp",
 723     .protocol_name          = "tftp",
 724
 725     .instance_size          = sizeof(BDRVCURLState),
 726     .bdrv_parse_filename    = curl_parse_filename,
 727     .bdrv_file_open         = curl_open,
 728     .bdrv_close             = curl_close,
 729     .bdrv_getlength         = curl_getlength,
 730
 731     .bdrv_aio_readv         = curl_aio_readv,
 732 };
 733
 734 static void curl_block_init(void)
 735 {
 736     bdrv_register(&bdrv_http);
 737     bdrv_register(&bdrv_https);
 738     bdrv_register(&bdrv_ftp);
 739     bdrv_register(&bdrv_ftps);
 740     bdrv_register(&bdrv_tftp);
 741 }
 742
 743 block_init(curl_block_init);