block/curl.c

   1 /*
   2  * QEMU Block driver for CURL images
   3  *
   4  * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
   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     curl_socket_t sock_fd;
  75     char *orig_buf;
  76     size_t buf_start;
  77     size_t buf_off;
  78     size_t buf_len;
  79     char range[128];
  80     char errmsg[CURL_ERROR_SIZE];
  81     char in_use;
  82 } CURLState;
  83
  84 typedef struct BDRVCURLState {
  85     CURLM *multi;
  86     QEMUTimer timer;
  87     size_t len;
  88     CURLState states[CURL_NUM_STATES];
  89     char *url;
  90     size_t readahead_size;
  91     bool accept_range;
  92 } BDRVCURLState;
  93
  94 static void curl_clean_state(CURLState *s);
  95 static void curl_multi_do(void *arg);
  96 static void curl_multi_read(void *arg);
  97
  98 #ifdef NEED_CURL_TIMER_CALLBACK
  99 static int curl_timer_cb(CURLM *multi, long timeout_ms, void *opaque)
 100 {
 101     BDRVCURLState *s = opaque;
 102
 103     DPRINTF("CURL: timer callback timeout_ms %ld\n", timeout_ms);
 104     if (timeout_ms == -1) {
 105         timer_del(&s->timer);
 106     } else {
 107         int64_t timeout_ns = (int64_t)timeout_ms * 1000 * 1000;
 108         timer_mod(&s->timer,
 109                   qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + timeout_ns);
 110     }
 111     return 0;
 112 }
 113 #endif
 114
 115 static int curl_sock_cb(CURL *curl, curl_socket_t fd, int action,
 116                         void *s, void *sp)
 117 {
 118     CURLState *state = NULL;
 119     curl_easy_getinfo(curl, CURLINFO_PRIVATE, (char **)&state);
 120     state->sock_fd = fd;
 121
 122     DPRINTF("CURL (AIO): Sock action %d on fd %d\n", action, fd);
 123     switch (action) {
 124         case CURL_POLL_IN:
 125             qemu_aio_set_fd_handler(fd, curl_multi_read, NULL, state);
 126             break;
 127         case CURL_POLL_OUT:
 128             qemu_aio_set_fd_handler(fd, NULL, curl_multi_do, state);
 129             break;
 130         case CURL_POLL_INOUT:
 131             qemu_aio_set_fd_handler(fd, curl_multi_read, curl_multi_do, state);
 132             break;
 133         case CURL_POLL_REMOVE:
 134             qemu_aio_set_fd_handler(fd, NULL, NULL, NULL);
 135             break;
 136     }
 137
 138     return 0;
 139 }
 140
 141 static size_t curl_header_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
 142 {
 143     BDRVCURLState *s = opaque;
 144     size_t realsize = size * nmemb;
 145     const char *accept_line = "Accept-Ranges: bytes";
 146
 147     if (realsize >= strlen(accept_line)
 148         && strncmp((char *)ptr, accept_line, strlen(accept_line)) == 0) {
 149         s->accept_range = true;
 150     }
 151
 152     return realsize;
 153 }
 154
 155 static size_t curl_read_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
 156 {
 157     CURLState *s = ((CURLState*)opaque);
 158     size_t realsize = size * nmemb;
 159     int i;
 160
 161     DPRINTF("CURL: Just reading %zd bytes\n", realsize);
 162
 163     if (!s || !s->orig_buf)
 164         return 0;
 165
 166     if (s->buf_off >= s->buf_len) {
 167         /* buffer full, read nothing */
 168         return 0;
 169     }
 170     realsize = MIN(realsize, s->buf_len - s->buf_off);
 171     memcpy(s->orig_buf + s->buf_off, ptr, realsize);
 172     s->buf_off += realsize;
 173
 174     for(i=0; i<CURL_NUM_ACB; i++) {
 175         CURLAIOCB *acb = s->acb[i];
 176
 177         if (!acb)
 178             continue;
 179
 180         if ((s->buf_off >= acb->end)) {
 181             qemu_iovec_from_buf(acb->qiov, 0, s->orig_buf + acb->start,
 182                                 acb->end - acb->start);
 183             acb->common.cb(acb->common.opaque, 0);
 184             qemu_aio_release(acb);
 185             s->acb[i] = NULL;
 186         }
 187     }
 188
 189     return realsize;
 190 }
 191
 192 static int curl_find_buf(BDRVCURLState *s, size_t start, size_t len,
 193                          CURLAIOCB *acb)
 194 {
 195     int i;
 196     size_t end = start + len;
 197
 198     for (i=0; i<CURL_NUM_STATES; i++) {
 199         CURLState *state = &s->states[i];
 200         size_t buf_end = (state->buf_start + state->buf_off);
 201         size_t buf_fend = (state->buf_start + state->buf_len);
 202
 203         if (!state->orig_buf)
 204             continue;
 205         if (!state->buf_off)
 206             continue;
 207
 208         // Does the existing buffer cover our section?
 209         if ((start >= state->buf_start) &&
 210             (start <= buf_end) &&
 211             (end >= state->buf_start) &&
 212             (end <= buf_end))
 213         {
 214             char *buf = state->orig_buf + (start - state->buf_start);
 215
 216             qemu_iovec_from_buf(acb->qiov, 0, buf, len);
 217             acb->common.cb(acb->common.opaque, 0);
 218
 219             return FIND_RET_OK;
 220         }
 221
 222         // Wait for unfinished chunks
 223         if (state->in_use &&
 224             (start >= state->buf_start) &&
 225             (start <= buf_fend) &&
 226             (end >= state->buf_start) &&
 227             (end <= buf_fend))
 228         {
 229             int j;
 230
 231             acb->start = start - state->buf_start;
 232             acb->end = acb->start + len;
 233
 234             for (j=0; j<CURL_NUM_ACB; j++) {
 235                 if (!state->acb[j]) {
 236                     state->acb[j] = acb;
 237                     return FIND_RET_WAIT;
 238                 }
 239             }
 240         }
 241     }
 242
 243     return FIND_RET_NONE;
 244 }
 245
 246 static void curl_multi_check_completion(BDRVCURLState *s)
 247 {
 248     int msgs_in_queue;
 249
 250     /* Try to find done transfers, so we can free the easy
 251      * handle again. */
 252     for (;;) {
 253         CURLMsg *msg;
 254         msg = curl_multi_info_read(s->multi, &msgs_in_queue);
 255
 256         /* Quit when there are no more completions */
 257         if (!msg)
 258             break;
 259
 260         if (msg->msg == CURLMSG_DONE) {
 261             CURLState *state = NULL;
 262             curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE,
 263                               (char **)&state);
 264
 265             /* ACBs for successful messages get completed in curl_read_cb */
 266             if (msg->data.result != CURLE_OK) {
 267                 int i;
 268                 for (i = 0; i < CURL_NUM_ACB; i++) {
 269                     CURLAIOCB *acb = state->acb[i];
 270
 271                     if (acb == NULL) {
 272                         continue;
 273                     }
 274
 275                     acb->common.cb(acb->common.opaque, -EIO);
 276                     qemu_aio_release(acb);
 277                     state->acb[i] = NULL;
 278                 }
 279             }
 280
 281             curl_clean_state(state);
 282             break;
 283         }
 284     }
 285 }
 286
 287 static void curl_multi_do(void *arg)
 288 {
 289     CURLState *s = (CURLState *)arg;
 290     int running;
 291     int r;
 292
 293     if (!s->s->multi) {
 294         return;
 295     }
 296
 297     do {
 298         r = curl_multi_socket_action(s->s->multi, s->sock_fd, 0, &running);
 299     } while(r == CURLM_CALL_MULTI_PERFORM);
 300
 301 }
 302
 303 static void curl_multi_read(void *arg)
 304 {
 305     CURLState *s = (CURLState *)arg;
 306
 307     curl_multi_do(arg);
 308     curl_multi_check_completion(s->s);
 309 }
 310
 311 static void curl_multi_timeout_do(void *arg)
 312 {
 313 #ifdef NEED_CURL_TIMER_CALLBACK
 314     BDRVCURLState *s = (BDRVCURLState *)arg;
 315     int running;
 316
 317     if (!s->multi) {
 318         return;
 319     }
 320
 321     curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running);
 322
 323     curl_multi_check_completion(s);
 324 #else
 325     abort();
 326 #endif
 327 }
 328
 329 static CURLState *curl_init_state(BDRVCURLState *s)
 330 {
 331     CURLState *state = NULL;
 332     int i, j;
 333
 334     do {
 335         for (i=0; i<CURL_NUM_STATES; i++) {
 336             for (j=0; j<CURL_NUM_ACB; j++)
 337                 if (s->states[i].acb[j])
 338                     continue;
 339             if (s->states[i].in_use)
 340                 continue;
 341
 342             state = &s->states[i];
 343             state->in_use = 1;
 344             break;
 345         }
 346         if (!state) {
 347             qemu_aio_wait();
 348         }
 349     } while(!state);
 350
 351     if (!state->curl) {
 352         state->curl = curl_easy_init();
 353         if (!state->curl) {
 354             return NULL;
 355         }
 356         curl_easy_setopt(state->curl, CURLOPT_URL, s->url);
 357         curl_easy_setopt(state->curl, CURLOPT_TIMEOUT, 5);
 358         curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION,
 359                          (void *)curl_read_cb);
 360         curl_easy_setopt(state->curl, CURLOPT_WRITEDATA, (void *)state);
 361         curl_easy_setopt(state->curl, CURLOPT_PRIVATE, (void *)state);
 362         curl_easy_setopt(state->curl, CURLOPT_AUTOREFERER, 1);
 363         curl_easy_setopt(state->curl, CURLOPT_FOLLOWLOCATION, 1);
 364         curl_easy_setopt(state->curl, CURLOPT_NOSIGNAL, 1);
 365         curl_easy_setopt(state->curl, CURLOPT_ERRORBUFFER, state->errmsg);
 366         curl_easy_setopt(state->curl, CURLOPT_FAILONERROR, 1);
 367
 368         /* Restrict supported protocols to avoid security issues in the more
 369          * obscure protocols.  For example, do not allow POP3/SMTP/IMAP see
 370          * CVE-2013-0249.
 371          *
 372          * Restricting protocols is only supported from 7.19.4 upwards.
 373          */
 374 #if LIBCURL_VERSION_NUM >= 0x071304
 375         curl_easy_setopt(state->curl, CURLOPT_PROTOCOLS, PROTOCOLS);
 376         curl_easy_setopt(state->curl, CURLOPT_REDIR_PROTOCOLS, PROTOCOLS);
 377 #endif
 378
 379 #ifdef DEBUG_VERBOSE
 380         curl_easy_setopt(state->curl, CURLOPT_VERBOSE, 1);
 381 #endif
 382     }
 383
 384     state->s = s;
 385
 386     return state;
 387 }
 388
 389 static void curl_clean_state(CURLState *s)
 390 {
 391     if (s->s->multi)
 392         curl_multi_remove_handle(s->s->multi, s->curl);
 393     s->in_use = 0;
 394 }
 395
 396 static void curl_parse_filename(const char *filename, QDict *options,
 397                                 Error **errp)
 398 {
 399
 400     #define RA_OPTSTR ":readahead="
 401     char *file;
 402     char *ra;
 403     const char *ra_val;
 404     int parse_state = 0;
 405
 406     file = g_strdup(filename);
 407
 408     /* Parse a trailing ":readahead=#:" param, if present. */
 409     ra = file + strlen(file) - 1;
 410     while (ra >= file) {
 411         if (parse_state == 0) {
 412             if (*ra == ':') {
 413                 parse_state++;
 414             } else {
 415                 break;
 416             }
 417         } else if (parse_state == 1) {
 418             if (*ra > '9' || *ra < '0') {
 419                 char *opt_start = ra - strlen(RA_OPTSTR) + 1;
 420                 if (opt_start > file &&
 421                     strncmp(opt_start, RA_OPTSTR, strlen(RA_OPTSTR)) == 0) {
 422                     ra_val = ra + 1;
 423                     ra -= strlen(RA_OPTSTR) - 1;
 424                     *ra = '\0';
 425                     qdict_put(options, "readahead", qstring_from_str(ra_val));
 426                 }
 427                 break;
 428             }
 429         }
 430         ra--;
 431     }
 432
 433     qdict_put(options, "url", qstring_from_str(file));
 434
 435     g_free(file);
 436 }
 437
 438 static QemuOptsList runtime_opts = {
 439     .name = "curl",
 440     .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
 441     .desc = {
 442         {
 443             .name = "url",
 444             .type = QEMU_OPT_STRING,
 445             .help = "URL to open",
 446         },
 447         {
 448             .name = "readahead",
 449             .type = QEMU_OPT_SIZE,
 450             .help = "Readahead size",
 451         },
 452         { /* end of list */ }
 453     },
 454 };
 455
 456 static int curl_open(BlockDriverState *bs, QDict *options, int flags,
 457                      Error **errp)
 458 {
 459     BDRVCURLState *s = bs->opaque;
 460     CURLState *state = NULL;
 461     QemuOpts *opts;
 462     Error *local_err = NULL;
 463     const char *file;
 464     double d;
 465
 466     static int inited = 0;
 467
 468     if (flags & BDRV_O_RDWR) {
 469         error_setg(errp, "curl block device does not support writes");
 470         return -EROFS;
 471     }
 472
 473     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
 474     qemu_opts_absorb_qdict(opts, options, &local_err);
 475     if (local_err) {
 476         error_propagate(errp, local_err);
 477         goto out_noclean;
 478     }
 479
 480     s->readahead_size = qemu_opt_get_size(opts, "readahead", READ_AHEAD_SIZE);
 481     if ((s->readahead_size & 0x1ff) != 0) {
 482         error_setg(errp, "HTTP_READAHEAD_SIZE %zd is not a multiple of 512",
 483                    s->readahead_size);
 484         goto out_noclean;
 485     }
 486
 487     file = qemu_opt_get(opts, "url");
 488     if (file == NULL) {
 489         error_setg(errp, "curl block driver requires an 'url' option");
 490         goto out_noclean;
 491     }
 492
 493     if (!inited) {
 494         curl_global_init(CURL_GLOBAL_ALL);
 495         inited = 1;
 496     }
 497
 498     DPRINTF("CURL: Opening %s\n", file);
 499     s->url = g_strdup(file);
 500     state = curl_init_state(s);
 501     if (!state)
 502         goto out_noclean;
 503
 504     // Get file size
 505
 506     s->accept_range = false;
 507     curl_easy_setopt(state->curl, CURLOPT_NOBODY, 1);
 508     curl_easy_setopt(state->curl, CURLOPT_HEADERFUNCTION,
 509                      curl_header_cb);
 510     curl_easy_setopt(state->curl, CURLOPT_HEADERDATA, s);
 511     if (curl_easy_perform(state->curl))
 512         goto out;
 513     curl_easy_getinfo(state->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &d);
 514     if (d)
 515         s->len = (size_t)d;
 516     else if(!s->len)
 517         goto out;
 518     if ((!strncasecmp(s->url, "http://", strlen("http://"))
 519         || !strncasecmp(s->url, "https://", strlen("https://")))
 520         && !s->accept_range) {
 521         pstrcpy(state->errmsg, CURL_ERROR_SIZE,
 522                 "Server does not support 'range' (byte ranges).");
 523         goto out;
 524     }
 525     DPRINTF("CURL: Size = %zd\n", s->len);
 526
 527     curl_clean_state(state);
 528     curl_easy_cleanup(state->curl);
 529     state->curl = NULL;
 530
 531     aio_timer_init(bdrv_get_aio_context(bs), &s->timer,
 532                    QEMU_CLOCK_REALTIME, SCALE_NS,
 533                    curl_multi_timeout_do, s);
 534
 535     // Now we know the file exists and its size, so let's
 536     // initialize the multi interface!
 537
 538     s->multi = curl_multi_init();
 539     curl_multi_setopt(s->multi, CURLMOPT_SOCKETFUNCTION, curl_sock_cb);
 540 #ifdef NEED_CURL_TIMER_CALLBACK
 541     curl_multi_setopt(s->multi, CURLMOPT_TIMERDATA, s);
 542     curl_multi_setopt(s->multi, CURLMOPT_TIMERFUNCTION, curl_timer_cb);
 543 #endif
 544
 545     qemu_opts_del(opts);
 546     return 0;
 547
 548 out:
 549     error_setg(errp, "CURL: Error opening file: %s", state->errmsg);
 550     curl_easy_cleanup(state->curl);
 551     state->curl = NULL;
 552 out_noclean:
 553     g_free(s->url);
 554     qemu_opts_del(opts);
 555     return -EINVAL;
 556 }
 557
 558 static void curl_aio_cancel(BlockDriverAIOCB *blockacb)
 559 {
 560     // Do we have to implement canceling? Seems to work without...
 561 }
 562
 563 static const AIOCBInfo curl_aiocb_info = {
 564     .aiocb_size         = sizeof(CURLAIOCB),
 565     .cancel             = curl_aio_cancel,
 566 };
 567
 568
 569 static void curl_readv_bh_cb(void *p)
 570 {
 571     CURLState *state;
 572     int running;
 573
 574     CURLAIOCB *acb = p;
 575     BDRVCURLState *s = acb->common.bs->opaque;
 576
 577     qemu_bh_delete(acb->bh);
 578     acb->bh = NULL;
 579
 580     size_t start = acb->sector_num * SECTOR_SIZE;
 581     size_t end;
 582
 583     // In case we have the requested data already (e.g. read-ahead),
 584     // we can just call the callback and be done.
 585     switch (curl_find_buf(s, start, acb->nb_sectors * SECTOR_SIZE, acb)) {
 586         case FIND_RET_OK:
 587             qemu_aio_release(acb);
 588             // fall through
 589         case FIND_RET_WAIT:
 590             return;
 591         default:
 592             break;
 593     }
 594
 595     // No cache found, so let's start a new request
 596     state = curl_init_state(s);
 597     if (!state) {
 598         acb->common.cb(acb->common.opaque, -EIO);
 599         qemu_aio_release(acb);
 600         return;
 601     }
 602
 603     acb->start = 0;
 604     acb->end = (acb->nb_sectors * SECTOR_SIZE);
 605
 606     state->buf_off = 0;
 607     if (state->orig_buf)
 608         g_free(state->orig_buf);
 609     state->buf_start = start;
 610     state->buf_len = acb->end + s->readahead_size;
 611     end = MIN(start + state->buf_len, s->len) - 1;
 612     state->orig_buf = g_malloc(state->buf_len);
 613     state->acb[0] = acb;
 614
 615     snprintf(state->range, 127, "%zd-%zd", start, end);
 616     DPRINTF("CURL (AIO): Reading %d at %zd (%s)\n",
 617             (acb->nb_sectors * SECTOR_SIZE), start, state->range);
 618     curl_easy_setopt(state->curl, CURLOPT_RANGE, state->range);
 619
 620     curl_multi_add_handle(s->multi, state->curl);
 621
 622     /* Tell curl it needs to kick things off */
 623     curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running);
 624 }
 625
 626 static BlockDriverAIOCB *curl_aio_readv(BlockDriverState *bs,
 627         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 628         BlockDriverCompletionFunc *cb, void *opaque)
 629 {
 630     CURLAIOCB *acb;
 631
 632     acb = qemu_aio_get(&curl_aiocb_info, bs, cb, opaque);
 633
 634     acb->qiov = qiov;
 635     acb->sector_num = sector_num;
 636     acb->nb_sectors = nb_sectors;
 637
 638     acb->bh = qemu_bh_new(curl_readv_bh_cb, acb);
 639     qemu_bh_schedule(acb->bh);
 640     return &acb->common;
 641 }
 642
 643 static void curl_close(BlockDriverState *bs)
 644 {
 645     BDRVCURLState *s = bs->opaque;
 646     int i;
 647
 648     DPRINTF("CURL: Close\n");
 649     for (i=0; i<CURL_NUM_STATES; i++) {
 650         if (s->states[i].in_use)
 651             curl_clean_state(&s->states[i]);
 652         if (s->states[i].curl) {
 653             curl_easy_cleanup(s->states[i].curl);
 654             s->states[i].curl = NULL;
 655         }
 656         if (s->states[i].orig_buf) {
 657             g_free(s->states[i].orig_buf);
 658             s->states[i].orig_buf = NULL;
 659         }
 660     }
 661     if (s->multi)
 662         curl_multi_cleanup(s->multi);
 663
 664     timer_del(&s->timer);
 665
 666     g_free(s->url);
 667 }
 668
 669 static int64_t curl_getlength(BlockDriverState *bs)
 670 {
 671     BDRVCURLState *s = bs->opaque;
 672     return s->len;
 673 }
 674
 675 static BlockDriver bdrv_http = {
 676     .format_name            = "http",
 677     .protocol_name          = "http",
 678
 679     .instance_size          = sizeof(BDRVCURLState),
 680     .bdrv_parse_filename    = curl_parse_filename,
 681     .bdrv_file_open         = curl_open,
 682     .bdrv_close             = curl_close,
 683     .bdrv_getlength         = curl_getlength,
 684
 685     .bdrv_aio_readv         = curl_aio_readv,
 686 };
 687
 688 static BlockDriver bdrv_https = {
 689     .format_name            = "https",
 690     .protocol_name          = "https",
 691
 692     .instance_size          = sizeof(BDRVCURLState),
 693     .bdrv_parse_filename    = curl_parse_filename,
 694     .bdrv_file_open         = curl_open,
 695     .bdrv_close             = curl_close,
 696     .bdrv_getlength         = curl_getlength,
 697
 698     .bdrv_aio_readv         = curl_aio_readv,
 699 };
 700
 701 static BlockDriver bdrv_ftp = {
 702     .format_name            = "ftp",
 703     .protocol_name          = "ftp",
 704
 705     .instance_size          = sizeof(BDRVCURLState),
 706     .bdrv_parse_filename    = curl_parse_filename,
 707     .bdrv_file_open         = curl_open,
 708     .bdrv_close             = curl_close,
 709     .bdrv_getlength         = curl_getlength,
 710
 711     .bdrv_aio_readv         = curl_aio_readv,
 712 };
 713
 714 static BlockDriver bdrv_ftps = {
 715     .format_name            = "ftps",
 716     .protocol_name          = "ftps",
 717
 718     .instance_size          = sizeof(BDRVCURLState),
 719     .bdrv_parse_filename    = curl_parse_filename,
 720     .bdrv_file_open         = curl_open,
 721     .bdrv_close             = curl_close,
 722     .bdrv_getlength         = curl_getlength,
 723
 724     .bdrv_aio_readv         = curl_aio_readv,
 725 };
 726
 727 static BlockDriver bdrv_tftp = {
 728     .format_name            = "tftp",
 729     .protocol_name          = "tftp",
 730
 731     .instance_size          = sizeof(BDRVCURLState),
 732     .bdrv_parse_filename    = curl_parse_filename,
 733     .bdrv_file_open         = curl_open,
 734     .bdrv_close             = curl_close,
 735     .bdrv_getlength         = curl_getlength,
 736
 737     .bdrv_aio_readv         = curl_aio_readv,
 738 };
 739
 740 static void curl_block_init(void)
 741 {
 742     bdrv_register(&bdrv_http);
 743     bdrv_register(&bdrv_https);
 744     bdrv_register(&bdrv_ftp);
 745     bdrv_register(&bdrv_ftps);
 746     bdrv_register(&bdrv_tftp);
 747 }
 748
 749 block_init(curl_block_init);