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 "qapi/qmp/qbool.h"
  27 #include <curl/curl.h>
  28
  29 // #define DEBUG
  30 // #define DEBUG_VERBOSE
  31
  32 #ifdef DEBUG_CURL
  33 #define DPRINTF(fmt, ...) do { printf(fmt, ## __VA_ARGS__); } while (0)
  34 #else
  35 #define DPRINTF(fmt, ...) do { } while (0)
  36 #endif
  37
  38 #if LIBCURL_VERSION_NUM >= 0x071000
  39 /* The multi interface timer callback was introduced in 7.16.0 */
  40 #define NEED_CURL_TIMER_CALLBACK
  41 #define HAVE_SOCKET_ACTION
  42 #endif
  43
  44 #ifndef HAVE_SOCKET_ACTION
  45 /* If curl_multi_socket_action isn't available, define it statically here in
  46  * terms of curl_multi_socket. Note that ev_bitmask will be ignored, which is
  47  * less efficient but still safe. */
  48 static CURLMcode __curl_multi_socket_action(CURLM *multi_handle,
  49                                             curl_socket_t sockfd,
  50                                             int ev_bitmask,
  51                                             int *running_handles)
  52 {
  53     return curl_multi_socket(multi_handle, sockfd, running_handles);
  54 }
  55 #define curl_multi_socket_action __curl_multi_socket_action
  56 #endif
  57
  58 #define PROTOCOLS (CURLPROTO_HTTP | CURLPROTO_HTTPS | \
  59                    CURLPROTO_FTP | CURLPROTO_FTPS | \
  60                    CURLPROTO_TFTP)
  61
  62 #define CURL_NUM_STATES 8
  63 #define CURL_NUM_ACB    8
  64 #define SECTOR_SIZE     512
  65 #define READ_AHEAD_DEFAULT (256 * 1024)
  66
  67 #define FIND_RET_NONE   0
  68 #define FIND_RET_OK     1
  69 #define FIND_RET_WAIT   2
  70
  71 #define CURL_BLOCK_OPT_URL       "url"
  72 #define CURL_BLOCK_OPT_READAHEAD "readahead"
  73 #define CURL_BLOCK_OPT_SSLVERIFY "sslverify"
  74
  75 struct BDRVCURLState;
  76
  77 typedef struct CURLAIOCB {
  78     BlockDriverAIOCB common;
  79     QEMUBH *bh;
  80     QEMUIOVector *qiov;
  81
  82     int64_t sector_num;
  83     int nb_sectors;
  84
  85     size_t start;
  86     size_t end;
  87 } CURLAIOCB;
  88
  89 typedef struct CURLState
  90 {
  91     struct BDRVCURLState *s;
  92     CURLAIOCB *acb[CURL_NUM_ACB];
  93     CURL *curl;
  94     curl_socket_t sock_fd;
  95     char *orig_buf;
  96     size_t buf_start;
  97     size_t buf_off;
  98     size_t buf_len;
  99     char range[128];
 100     char errmsg[CURL_ERROR_SIZE];
 101     char in_use;
 102 } CURLState;
 103
 104 typedef struct BDRVCURLState {
 105     CURLM *multi;
 106     QEMUTimer timer;
 107     size_t len;
 108     CURLState states[CURL_NUM_STATES];
 109     char *url;
 110     size_t readahead_size;
 111     bool sslverify;
 112     bool accept_range;
 113 } BDRVCURLState;
 114
 115 static void curl_clean_state(CURLState *s);
 116 static void curl_multi_do(void *arg);
 117 static void curl_multi_read(void *arg);
 118
 119 #ifdef NEED_CURL_TIMER_CALLBACK
 120 static int curl_timer_cb(CURLM *multi, long timeout_ms, void *opaque)
 121 {
 122     BDRVCURLState *s = opaque;
 123
 124     DPRINTF("CURL: timer callback timeout_ms %ld\n", timeout_ms);
 125     if (timeout_ms == -1) {
 126         timer_del(&s->timer);
 127     } else {
 128         int64_t timeout_ns = (int64_t)timeout_ms * 1000 * 1000;
 129         timer_mod(&s->timer,
 130                   qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + timeout_ns);
 131     }
 132     return 0;
 133 }
 134 #endif
 135
 136 static int curl_sock_cb(CURL *curl, curl_socket_t fd, int action,
 137                         void *s, void *sp)
 138 {
 139     CURLState *state = NULL;
 140     curl_easy_getinfo(curl, CURLINFO_PRIVATE, (char **)&state);
 141     state->sock_fd = fd;
 142
 143     DPRINTF("CURL (AIO): Sock action %d on fd %d\n", action, fd);
 144     switch (action) {
 145         case CURL_POLL_IN:
 146             qemu_aio_set_fd_handler(fd, curl_multi_read, NULL, state);
 147             break;
 148         case CURL_POLL_OUT:
 149             qemu_aio_set_fd_handler(fd, NULL, curl_multi_do, state);
 150             break;
 151         case CURL_POLL_INOUT:
 152             qemu_aio_set_fd_handler(fd, curl_multi_read, curl_multi_do, state);
 153             break;
 154         case CURL_POLL_REMOVE:
 155             qemu_aio_set_fd_handler(fd, NULL, NULL, NULL);
 156             break;
 157     }
 158
 159     return 0;
 160 }
 161
 162 static size_t curl_header_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
 163 {
 164     BDRVCURLState *s = opaque;
 165     size_t realsize = size * nmemb;
 166     const char *accept_line = "Accept-Ranges: bytes";
 167
 168     if (realsize >= strlen(accept_line)
 169         && strncmp((char *)ptr, accept_line, strlen(accept_line)) == 0) {
 170         s->accept_range = true;
 171     }
 172
 173     return realsize;
 174 }
 175
 176 static size_t curl_read_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
 177 {
 178     CURLState *s = ((CURLState*)opaque);
 179     size_t realsize = size * nmemb;
 180     int i;
 181
 182     DPRINTF("CURL: Just reading %zd bytes\n", realsize);
 183
 184     if (!s || !s->orig_buf)
 185         return 0;
 186
 187     if (s->buf_off >= s->buf_len) {
 188         /* buffer full, read nothing */
 189         return 0;
 190     }
 191     realsize = MIN(realsize, s->buf_len - s->buf_off);
 192     memcpy(s->orig_buf + s->buf_off, ptr, realsize);
 193     s->buf_off += realsize;
 194
 195     for(i=0; i<CURL_NUM_ACB; i++) {
 196         CURLAIOCB *acb = s->acb[i];
 197
 198         if (!acb)
 199             continue;
 200
 201         if ((s->buf_off >= acb->end)) {
 202             qemu_iovec_from_buf(acb->qiov, 0, s->orig_buf + acb->start,
 203                                 acb->end - acb->start);
 204             acb->common.cb(acb->common.opaque, 0);
 205             qemu_aio_release(acb);
 206             s->acb[i] = NULL;
 207         }
 208     }
 209
 210     return realsize;
 211 }
 212
 213 static int curl_find_buf(BDRVCURLState *s, size_t start, size_t len,
 214                          CURLAIOCB *acb)
 215 {
 216     int i;
 217     size_t end = start + len;
 218
 219     for (i=0; i<CURL_NUM_STATES; i++) {
 220         CURLState *state = &s->states[i];
 221         size_t buf_end = (state->buf_start + state->buf_off);
 222         size_t buf_fend = (state->buf_start + state->buf_len);
 223
 224         if (!state->orig_buf)
 225             continue;
 226         if (!state->buf_off)
 227             continue;
 228
 229         // Does the existing buffer cover our section?
 230         if ((start >= state->buf_start) &&
 231             (start <= buf_end) &&
 232             (end >= state->buf_start) &&
 233             (end <= buf_end))
 234         {
 235             char *buf = state->orig_buf + (start - state->buf_start);
 236
 237             qemu_iovec_from_buf(acb->qiov, 0, buf, len);
 238             acb->common.cb(acb->common.opaque, 0);
 239
 240             return FIND_RET_OK;
 241         }
 242
 243         // Wait for unfinished chunks
 244         if (state->in_use &&
 245             (start >= state->buf_start) &&
 246             (start <= buf_fend) &&
 247             (end >= state->buf_start) &&
 248             (end <= buf_fend))
 249         {
 250             int j;
 251
 252             acb->start = start - state->buf_start;
 253             acb->end = acb->start + len;
 254
 255             for (j=0; j<CURL_NUM_ACB; j++) {
 256                 if (!state->acb[j]) {
 257                     state->acb[j] = acb;
 258                     return FIND_RET_WAIT;
 259                 }
 260             }
 261         }
 262     }
 263
 264     return FIND_RET_NONE;
 265 }
 266
 267 static void curl_multi_check_completion(BDRVCURLState *s)
 268 {
 269     int msgs_in_queue;
 270
 271     /* Try to find done transfers, so we can free the easy
 272      * handle again. */
 273     for (;;) {
 274         CURLMsg *msg;
 275         msg = curl_multi_info_read(s->multi, &msgs_in_queue);
 276
 277         /* Quit when there are no more completions */
 278         if (!msg)
 279             break;
 280
 281         if (msg->msg == CURLMSG_DONE) {
 282             CURLState *state = NULL;
 283             curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE,
 284                               (char **)&state);
 285
 286             /* ACBs for successful messages get completed in curl_read_cb */
 287             if (msg->data.result != CURLE_OK) {
 288                 int i;
 289                 for (i = 0; i < CURL_NUM_ACB; i++) {
 290                     CURLAIOCB *acb = state->acb[i];
 291
 292                     if (acb == NULL) {
 293                         continue;
 294                     }
 295
 296                     acb->common.cb(acb->common.opaque, -EIO);
 297                     qemu_aio_release(acb);
 298                     state->acb[i] = NULL;
 299                 }
 300             }
 301
 302             curl_clean_state(state);
 303             break;
 304         }
 305     }
 306 }
 307
 308 static void curl_multi_do(void *arg)
 309 {
 310     CURLState *s = (CURLState *)arg;
 311     int running;
 312     int r;
 313
 314     if (!s->s->multi) {
 315         return;
 316     }
 317
 318     do {
 319         r = curl_multi_socket_action(s->s->multi, s->sock_fd, 0, &running);
 320     } while(r == CURLM_CALL_MULTI_PERFORM);
 321
 322 }
 323
 324 static void curl_multi_read(void *arg)
 325 {
 326     CURLState *s = (CURLState *)arg;
 327
 328     curl_multi_do(arg);
 329     curl_multi_check_completion(s->s);
 330 }
 331
 332 static void curl_multi_timeout_do(void *arg)
 333 {
 334 #ifdef NEED_CURL_TIMER_CALLBACK
 335     BDRVCURLState *s = (BDRVCURLState *)arg;
 336     int running;
 337
 338     if (!s->multi) {
 339         return;
 340     }
 341
 342     curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running);
 343
 344     curl_multi_check_completion(s);
 345 #else
 346     abort();
 347 #endif
 348 }
 349
 350 static CURLState *curl_init_state(BDRVCURLState *s)
 351 {
 352     CURLState *state = NULL;
 353     int i, j;
 354
 355     do {
 356         for (i=0; i<CURL_NUM_STATES; i++) {
 357             for (j=0; j<CURL_NUM_ACB; j++)
 358                 if (s->states[i].acb[j])
 359                     continue;
 360             if (s->states[i].in_use)
 361                 continue;
 362
 363             state = &s->states[i];
 364             state->in_use = 1;
 365             break;
 366         }
 367         if (!state) {
 368             qemu_aio_wait();
 369         }
 370     } while(!state);
 371
 372     if (!state->curl) {
 373         state->curl = curl_easy_init();
 374         if (!state->curl) {
 375             return NULL;
 376         }
 377         curl_easy_setopt(state->curl, CURLOPT_URL, s->url);
 378         curl_easy_setopt(state->curl, CURLOPT_SSL_VERIFYPEER,
 379                          (long) s->sslverify);
 380         curl_easy_setopt(state->curl, CURLOPT_TIMEOUT, 5);
 381         curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION,
 382                          (void *)curl_read_cb);
 383         curl_easy_setopt(state->curl, CURLOPT_WRITEDATA, (void *)state);
 384         curl_easy_setopt(state->curl, CURLOPT_PRIVATE, (void *)state);
 385         curl_easy_setopt(state->curl, CURLOPT_AUTOREFERER, 1);
 386         curl_easy_setopt(state->curl, CURLOPT_FOLLOWLOCATION, 1);
 387         curl_easy_setopt(state->curl, CURLOPT_NOSIGNAL, 1);
 388         curl_easy_setopt(state->curl, CURLOPT_ERRORBUFFER, state->errmsg);
 389         curl_easy_setopt(state->curl, CURLOPT_FAILONERROR, 1);
 390
 391         /* Restrict supported protocols to avoid security issues in the more
 392          * obscure protocols.  For example, do not allow POP3/SMTP/IMAP see
 393          * CVE-2013-0249.
 394          *
 395          * Restricting protocols is only supported from 7.19.4 upwards.
 396          */
 397 #if LIBCURL_VERSION_NUM >= 0x071304
 398         curl_easy_setopt(state->curl, CURLOPT_PROTOCOLS, PROTOCOLS);
 399         curl_easy_setopt(state->curl, CURLOPT_REDIR_PROTOCOLS, PROTOCOLS);
 400 #endif
 401
 402 #ifdef DEBUG_VERBOSE
 403         curl_easy_setopt(state->curl, CURLOPT_VERBOSE, 1);
 404 #endif
 405     }
 406
 407     state->s = s;
 408
 409     return state;
 410 }
 411
 412 static void curl_clean_state(CURLState *s)
 413 {
 414     if (s->s->multi)
 415         curl_multi_remove_handle(s->s->multi, s->curl);
 416     s->in_use = 0;
 417 }
 418
 419 static void curl_parse_filename(const char *filename, QDict *options,
 420                                 Error **errp)
 421 {
 422     qdict_put(options, CURL_BLOCK_OPT_URL, qstring_from_str(filename));
 423 }
 424
 425 static QemuOptsList runtime_opts = {
 426     .name = "curl",
 427     .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
 428     .desc = {
 429         {
 430             .name = CURL_BLOCK_OPT_URL,
 431             .type = QEMU_OPT_STRING,
 432             .help = "URL to open",
 433         },
 434         {
 435             .name = CURL_BLOCK_OPT_READAHEAD,
 436             .type = QEMU_OPT_SIZE,
 437             .help = "Readahead size",
 438         },
 439         {
 440             .name = CURL_BLOCK_OPT_SSLVERIFY,
 441             .type = QEMU_OPT_BOOL,
 442             .help = "Verify SSL certificate"
 443         },
 444         { /* end of list */ }
 445     },
 446 };
 447
 448 static int curl_open(BlockDriverState *bs, QDict *options, int flags,
 449                      Error **errp)
 450 {
 451     BDRVCURLState *s = bs->opaque;
 452     CURLState *state = NULL;
 453     QemuOpts *opts;
 454     Error *local_err = NULL;
 455     const char *file;
 456     double d;
 457
 458     static int inited = 0;
 459
 460     if (flags & BDRV_O_RDWR) {
 461         error_setg(errp, "curl block device does not support writes");
 462         return -EROFS;
 463     }
 464
 465     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
 466     qemu_opts_absorb_qdict(opts, options, &local_err);
 467     if (local_err) {
 468         error_propagate(errp, local_err);
 469         goto out_noclean;
 470     }
 471
 472     s->readahead_size = qemu_opt_get_size(opts, CURL_BLOCK_OPT_READAHEAD,
 473                                           READ_AHEAD_DEFAULT);
 474     if ((s->readahead_size & 0x1ff) != 0) {
 475         error_setg(errp, "HTTP_READAHEAD_SIZE %zd is not a multiple of 512",
 476                    s->readahead_size);
 477         goto out_noclean;
 478     }
 479
 480     s->sslverify = qemu_opt_get_bool(opts, CURL_BLOCK_OPT_SSLVERIFY, true);
 481
 482     file = qemu_opt_get(opts, CURL_BLOCK_OPT_URL);
 483     if (file == NULL) {
 484         error_setg(errp, "curl block driver requires an 'url' option");
 485         goto out_noclean;
 486     }
 487
 488     if (!inited) {
 489         curl_global_init(CURL_GLOBAL_ALL);
 490         inited = 1;
 491     }
 492
 493     DPRINTF("CURL: Opening %s\n", file);
 494     s->url = g_strdup(file);
 495     state = curl_init_state(s);
 496     if (!state)
 497         goto out_noclean;
 498
 499     // Get file size
 500
 501     s->accept_range = false;
 502     curl_easy_setopt(state->curl, CURLOPT_NOBODY, 1);
 503     curl_easy_setopt(state->curl, CURLOPT_HEADERFUNCTION,
 504                      curl_header_cb);
 505     curl_easy_setopt(state->curl, CURLOPT_HEADERDATA, s);
 506     if (curl_easy_perform(state->curl))
 507         goto out;
 508     curl_easy_getinfo(state->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &d);
 509     if (d)
 510         s->len = (size_t)d;
 511     else if(!s->len)
 512         goto out;
 513     if ((!strncasecmp(s->url, "http://", strlen("http://"))
 514         || !strncasecmp(s->url, "https://", strlen("https://")))
 515         && !s->accept_range) {
 516         pstrcpy(state->errmsg, CURL_ERROR_SIZE,
 517                 "Server does not support 'range' (byte ranges).");
 518         goto out;
 519     }
 520     DPRINTF("CURL: Size = %zd\n", s->len);
 521
 522     curl_clean_state(state);
 523     curl_easy_cleanup(state->curl);
 524     state->curl = NULL;
 525
 526     aio_timer_init(bdrv_get_aio_context(bs), &s->timer,
 527                    QEMU_CLOCK_REALTIME, SCALE_NS,
 528                    curl_multi_timeout_do, s);
 529
 530     // Now we know the file exists and its size, so let's
 531     // initialize the multi interface!
 532
 533     s->multi = curl_multi_init();
 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
 540     qemu_opts_del(opts);
 541     return 0;
 542
 543 out:
 544     error_setg(errp, "CURL: Error opening file: %s", state->errmsg);
 545     curl_easy_cleanup(state->curl);
 546     state->curl = NULL;
 547 out_noclean:
 548     g_free(s->url);
 549     qemu_opts_del(opts);
 550     return -EINVAL;
 551 }
 552
 553 static void curl_aio_cancel(BlockDriverAIOCB *blockacb)
 554 {
 555     // Do we have to implement canceling? Seems to work without...
 556 }
 557
 558 static const AIOCBInfo curl_aiocb_info = {
 559     .aiocb_size         = sizeof(CURLAIOCB),
 560     .cancel             = curl_aio_cancel,
 561 };
 562
 563
 564 static void curl_readv_bh_cb(void *p)
 565 {
 566     CURLState *state;
 567     int running;
 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
 617     /* Tell curl it needs to kick things off */
 618     curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running);
 619 }
 620
 621 static BlockDriverAIOCB *curl_aio_readv(BlockDriverState *bs,
 622         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 623         BlockDriverCompletionFunc *cb, void *opaque)
 624 {
 625     CURLAIOCB *acb;
 626
 627     acb = qemu_aio_get(&curl_aiocb_info, bs, cb, opaque);
 628
 629     acb->qiov = qiov;
 630     acb->sector_num = sector_num;
 631     acb->nb_sectors = nb_sectors;
 632
 633     acb->bh = qemu_bh_new(curl_readv_bh_cb, acb);
 634     qemu_bh_schedule(acb->bh);
 635     return &acb->common;
 636 }
 637
 638 static void curl_close(BlockDriverState *bs)
 639 {
 640     BDRVCURLState *s = bs->opaque;
 641     int i;
 642
 643     DPRINTF("CURL: Close\n");
 644     for (i=0; i<CURL_NUM_STATES; i++) {
 645         if (s->states[i].in_use)
 646             curl_clean_state(&s->states[i]);
 647         if (s->states[i].curl) {
 648             curl_easy_cleanup(s->states[i].curl);
 649             s->states[i].curl = NULL;
 650         }
 651         if (s->states[i].orig_buf) {
 652             g_free(s->states[i].orig_buf);
 653             s->states[i].orig_buf = NULL;
 654         }
 655     }
 656     if (s->multi)
 657         curl_multi_cleanup(s->multi);
 658
 659     timer_del(&s->timer);
 660
 661     g_free(s->url);
 662 }
 663
 664 static int64_t curl_getlength(BlockDriverState *bs)
 665 {
 666     BDRVCURLState *s = bs->opaque;
 667     return s->len;
 668 }
 669
 670 static BlockDriver bdrv_http = {
 671     .format_name            = "http",
 672     .protocol_name          = "http",
 673
 674     .instance_size          = sizeof(BDRVCURLState),
 675     .bdrv_parse_filename    = curl_parse_filename,
 676     .bdrv_file_open         = curl_open,
 677     .bdrv_close             = curl_close,
 678     .bdrv_getlength         = curl_getlength,
 679
 680     .bdrv_aio_readv         = curl_aio_readv,
 681 };
 682
 683 static BlockDriver bdrv_https = {
 684     .format_name            = "https",
 685     .protocol_name          = "https",
 686
 687     .instance_size          = sizeof(BDRVCURLState),
 688     .bdrv_parse_filename    = curl_parse_filename,
 689     .bdrv_file_open         = curl_open,
 690     .bdrv_close             = curl_close,
 691     .bdrv_getlength         = curl_getlength,
 692
 693     .bdrv_aio_readv         = curl_aio_readv,
 694 };
 695
 696 static BlockDriver bdrv_ftp = {
 697     .format_name            = "ftp",
 698     .protocol_name          = "ftp",
 699
 700     .instance_size          = sizeof(BDRVCURLState),
 701     .bdrv_parse_filename    = curl_parse_filename,
 702     .bdrv_file_open         = curl_open,
 703     .bdrv_close             = curl_close,
 704     .bdrv_getlength         = curl_getlength,
 705
 706     .bdrv_aio_readv         = curl_aio_readv,
 707 };
 708
 709 static BlockDriver bdrv_ftps = {
 710     .format_name            = "ftps",
 711     .protocol_name          = "ftps",
 712
 713     .instance_size          = sizeof(BDRVCURLState),
 714     .bdrv_parse_filename    = curl_parse_filename,
 715     .bdrv_file_open         = curl_open,
 716     .bdrv_close             = curl_close,
 717     .bdrv_getlength         = curl_getlength,
 718
 719     .bdrv_aio_readv         = curl_aio_readv,
 720 };
 721
 722 static BlockDriver bdrv_tftp = {
 723     .format_name            = "tftp",
 724     .protocol_name          = "tftp",
 725
 726     .instance_size          = sizeof(BDRVCURLState),
 727     .bdrv_parse_filename    = curl_parse_filename,
 728     .bdrv_file_open         = curl_open,
 729     .bdrv_close             = curl_close,
 730     .bdrv_getlength         = curl_getlength,
 731
 732     .bdrv_aio_readv         = curl_aio_readv,
 733 };
 734
 735 static void curl_block_init(void)
 736 {
 737     bdrv_register(&bdrv_http);
 738     bdrv_register(&bdrv_https);
 739     bdrv_register(&bdrv_ftp);
 740     bdrv_register(&bdrv_ftps);
 741     bdrv_register(&bdrv_tftp);
 742 }
 743
 744 block_init(curl_block_init);