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 #define CURL_TIMEOUT_DEFAULT 5
  67
  68 #define FIND_RET_NONE   0
  69 #define FIND_RET_OK     1
  70 #define FIND_RET_WAIT   2
  71
  72 #define CURL_BLOCK_OPT_URL       "url"
  73 #define CURL_BLOCK_OPT_READAHEAD "readahead"
  74 #define CURL_BLOCK_OPT_SSLVERIFY "sslverify"
  75 #define CURL_BLOCK_OPT_TIMEOUT "timeout"
  76
  77 struct BDRVCURLState;
  78
  79 typedef struct CURLAIOCB {
  80     BlockDriverAIOCB common;
  81     QEMUBH *bh;
  82     QEMUIOVector *qiov;
  83
  84     int64_t sector_num;
  85     int nb_sectors;
  86
  87     size_t start;
  88     size_t end;
  89 } CURLAIOCB;
  90
  91 typedef struct CURLState
  92 {
  93     struct BDRVCURLState *s;
  94     CURLAIOCB *acb[CURL_NUM_ACB];
  95     CURL *curl;
  96     curl_socket_t sock_fd;
  97     char *orig_buf;
  98     size_t buf_start;
  99     size_t buf_off;
 100     size_t buf_len;
 101     char range[128];
 102     char errmsg[CURL_ERROR_SIZE];
 103     char in_use;
 104 } CURLState;
 105
 106 typedef struct BDRVCURLState {
 107     CURLM *multi;
 108     QEMUTimer timer;
 109     size_t len;
 110     CURLState states[CURL_NUM_STATES];
 111     char *url;
 112     size_t readahead_size;
 113     bool sslverify;
 114     int timeout;
 115     bool accept_range;
 116     AioContext *aio_context;
 117 } BDRVCURLState;
 118
 119 static void curl_clean_state(CURLState *s);
 120 static void curl_multi_do(void *arg);
 121 static void curl_multi_read(void *arg);
 122
 123 #ifdef NEED_CURL_TIMER_CALLBACK
 124 static int curl_timer_cb(CURLM *multi, long timeout_ms, void *opaque)
 125 {
 126     BDRVCURLState *s = opaque;
 127
 128     DPRINTF("CURL: timer callback timeout_ms %ld\n", timeout_ms);
 129     if (timeout_ms == -1) {
 130         timer_del(&s->timer);
 131     } else {
 132         int64_t timeout_ns = (int64_t)timeout_ms * 1000 * 1000;
 133         timer_mod(&s->timer,
 134                   qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + timeout_ns);
 135     }
 136     return 0;
 137 }
 138 #endif
 139
 140 static int curl_sock_cb(CURL *curl, curl_socket_t fd, int action,
 141                         void *userp, void *sp)
 142 {
 143     BDRVCURLState *s;
 144     CURLState *state = NULL;
 145     curl_easy_getinfo(curl, CURLINFO_PRIVATE, (char **)&state);
 146     state->sock_fd = fd;
 147     s = state->s;
 148
 149     DPRINTF("CURL (AIO): Sock action %d on fd %d\n", action, fd);
 150     switch (action) {
 151         case CURL_POLL_IN:
 152             aio_set_fd_handler(s->aio_context, fd, curl_multi_read,
 153                                NULL, state);
 154             break;
 155         case CURL_POLL_OUT:
 156             aio_set_fd_handler(s->aio_context, fd, NULL, curl_multi_do, state);
 157             break;
 158         case CURL_POLL_INOUT:
 159             aio_set_fd_handler(s->aio_context, fd, curl_multi_read,
 160                                curl_multi_do, state);
 161             break;
 162         case CURL_POLL_REMOVE:
 163             aio_set_fd_handler(s->aio_context, fd, NULL, NULL, NULL);
 164             break;
 165     }
 166
 167     return 0;
 168 }
 169
 170 static size_t curl_header_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
 171 {
 172     BDRVCURLState *s = opaque;
 173     size_t realsize = size * nmemb;
 174     const char *accept_line = "Accept-Ranges: bytes";
 175
 176     if (realsize >= strlen(accept_line)
 177         && strncmp((char *)ptr, accept_line, strlen(accept_line)) == 0) {
 178         s->accept_range = true;
 179     }
 180
 181     return realsize;
 182 }
 183
 184 static size_t curl_read_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
 185 {
 186     CURLState *s = ((CURLState*)opaque);
 187     size_t realsize = size * nmemb;
 188     int i;
 189
 190     DPRINTF("CURL: Just reading %zd bytes\n", realsize);
 191
 192     if (!s || !s->orig_buf)
 193         return 0;
 194
 195     if (s->buf_off >= s->buf_len) {
 196         /* buffer full, read nothing */
 197         return 0;
 198     }
 199     realsize = MIN(realsize, s->buf_len - s->buf_off);
 200     memcpy(s->orig_buf + s->buf_off, ptr, realsize);
 201     s->buf_off += realsize;
 202
 203     for(i=0; i<CURL_NUM_ACB; i++) {
 204         CURLAIOCB *acb = s->acb[i];
 205
 206         if (!acb)
 207             continue;
 208
 209         if ((s->buf_off >= acb->end)) {
 210             qemu_iovec_from_buf(acb->qiov, 0, s->orig_buf + acb->start,
 211                                 acb->end - acb->start);
 212             acb->common.cb(acb->common.opaque, 0);
 213             qemu_aio_release(acb);
 214             s->acb[i] = NULL;
 215         }
 216     }
 217
 218     return realsize;
 219 }
 220
 221 static int curl_find_buf(BDRVCURLState *s, size_t start, size_t len,
 222                          CURLAIOCB *acb)
 223 {
 224     int i;
 225     size_t end = start + len;
 226
 227     for (i=0; i<CURL_NUM_STATES; i++) {
 228         CURLState *state = &s->states[i];
 229         size_t buf_end = (state->buf_start + state->buf_off);
 230         size_t buf_fend = (state->buf_start + state->buf_len);
 231
 232         if (!state->orig_buf)
 233             continue;
 234         if (!state->buf_off)
 235             continue;
 236
 237         // Does the existing buffer cover our section?
 238         if ((start >= state->buf_start) &&
 239             (start <= buf_end) &&
 240             (end >= state->buf_start) &&
 241             (end <= buf_end))
 242         {
 243             char *buf = state->orig_buf + (start - state->buf_start);
 244
 245             qemu_iovec_from_buf(acb->qiov, 0, buf, len);
 246             acb->common.cb(acb->common.opaque, 0);
 247
 248             return FIND_RET_OK;
 249         }
 250
 251         // Wait for unfinished chunks
 252         if (state->in_use &&
 253             (start >= state->buf_start) &&
 254             (start <= buf_fend) &&
 255             (end >= state->buf_start) &&
 256             (end <= buf_fend))
 257         {
 258             int j;
 259
 260             acb->start = start - state->buf_start;
 261             acb->end = acb->start + len;
 262
 263             for (j=0; j<CURL_NUM_ACB; j++) {
 264                 if (!state->acb[j]) {
 265                     state->acb[j] = acb;
 266                     return FIND_RET_WAIT;
 267                 }
 268             }
 269         }
 270     }
 271
 272     return FIND_RET_NONE;
 273 }
 274
 275 static void curl_multi_check_completion(BDRVCURLState *s)
 276 {
 277     int msgs_in_queue;
 278
 279     /* Try to find done transfers, so we can free the easy
 280      * handle again. */
 281     for (;;) {
 282         CURLMsg *msg;
 283         msg = curl_multi_info_read(s->multi, &msgs_in_queue);
 284
 285         /* Quit when there are no more completions */
 286         if (!msg)
 287             break;
 288
 289         if (msg->msg == CURLMSG_DONE) {
 290             CURLState *state = NULL;
 291             curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE,
 292                               (char **)&state);
 293
 294             /* ACBs for successful messages get completed in curl_read_cb */
 295             if (msg->data.result != CURLE_OK) {
 296                 int i;
 297                 for (i = 0; i < CURL_NUM_ACB; i++) {
 298                     CURLAIOCB *acb = state->acb[i];
 299
 300                     if (acb == NULL) {
 301                         continue;
 302                     }
 303
 304                     acb->common.cb(acb->common.opaque, -EIO);
 305                     qemu_aio_release(acb);
 306                     state->acb[i] = NULL;
 307                 }
 308             }
 309
 310             curl_clean_state(state);
 311             break;
 312         }
 313     }
 314 }
 315
 316 static void curl_multi_do(void *arg)
 317 {
 318     CURLState *s = (CURLState *)arg;
 319     int running;
 320     int r;
 321
 322     if (!s->s->multi) {
 323         return;
 324     }
 325
 326     do {
 327         r = curl_multi_socket_action(s->s->multi, s->sock_fd, 0, &running);
 328     } while(r == CURLM_CALL_MULTI_PERFORM);
 329
 330 }
 331
 332 static void curl_multi_read(void *arg)
 333 {
 334     CURLState *s = (CURLState *)arg;
 335
 336     curl_multi_do(arg);
 337     curl_multi_check_completion(s->s);
 338 }
 339
 340 static void curl_multi_timeout_do(void *arg)
 341 {
 342 #ifdef NEED_CURL_TIMER_CALLBACK
 343     BDRVCURLState *s = (BDRVCURLState *)arg;
 344     int running;
 345
 346     if (!s->multi) {
 347         return;
 348     }
 349
 350     curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running);
 351
 352     curl_multi_check_completion(s);
 353 #else
 354     abort();
 355 #endif
 356 }
 357
 358 static CURLState *curl_init_state(BDRVCURLState *s)
 359 {
 360     CURLState *state = NULL;
 361     int i, j;
 362
 363     do {
 364         for (i=0; i<CURL_NUM_STATES; i++) {
 365             for (j=0; j<CURL_NUM_ACB; j++)
 366                 if (s->states[i].acb[j])
 367                     continue;
 368             if (s->states[i].in_use)
 369                 continue;
 370
 371             state = &s->states[i];
 372             state->in_use = 1;
 373             break;
 374         }
 375         if (!state) {
 376             aio_poll(state->s->aio_context, true);
 377         }
 378     } while(!state);
 379
 380     if (!state->curl) {
 381         state->curl = curl_easy_init();
 382         if (!state->curl) {
 383             return NULL;
 384         }
 385         curl_easy_setopt(state->curl, CURLOPT_URL, s->url);
 386         curl_easy_setopt(state->curl, CURLOPT_SSL_VERIFYPEER,
 387                          (long) s->sslverify);
 388         curl_easy_setopt(state->curl, CURLOPT_TIMEOUT, s->timeout);
 389         curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION,
 390                          (void *)curl_read_cb);
 391         curl_easy_setopt(state->curl, CURLOPT_WRITEDATA, (void *)state);
 392         curl_easy_setopt(state->curl, CURLOPT_PRIVATE, (void *)state);
 393         curl_easy_setopt(state->curl, CURLOPT_AUTOREFERER, 1);
 394         curl_easy_setopt(state->curl, CURLOPT_FOLLOWLOCATION, 1);
 395         curl_easy_setopt(state->curl, CURLOPT_NOSIGNAL, 1);
 396         curl_easy_setopt(state->curl, CURLOPT_ERRORBUFFER, state->errmsg);
 397         curl_easy_setopt(state->curl, CURLOPT_FAILONERROR, 1);
 398
 399         /* Restrict supported protocols to avoid security issues in the more
 400          * obscure protocols.  For example, do not allow POP3/SMTP/IMAP see
 401          * CVE-2013-0249.
 402          *
 403          * Restricting protocols is only supported from 7.19.4 upwards.
 404          */
 405 #if LIBCURL_VERSION_NUM >= 0x071304
 406         curl_easy_setopt(state->curl, CURLOPT_PROTOCOLS, PROTOCOLS);
 407         curl_easy_setopt(state->curl, CURLOPT_REDIR_PROTOCOLS, PROTOCOLS);
 408 #endif
 409
 410 #ifdef DEBUG_VERBOSE
 411         curl_easy_setopt(state->curl, CURLOPT_VERBOSE, 1);
 412 #endif
 413     }
 414
 415     state->s = s;
 416
 417     return state;
 418 }
 419
 420 static void curl_clean_state(CURLState *s)
 421 {
 422     if (s->s->multi)
 423         curl_multi_remove_handle(s->s->multi, s->curl);
 424     s->in_use = 0;
 425 }
 426
 427 static void curl_parse_filename(const char *filename, QDict *options,
 428                                 Error **errp)
 429 {
 430     qdict_put(options, CURL_BLOCK_OPT_URL, qstring_from_str(filename));
 431 }
 432
 433 static void curl_detach_aio_context(BlockDriverState *bs)
 434 {
 435     BDRVCURLState *s = bs->opaque;
 436     int i;
 437
 438     for (i = 0; i < CURL_NUM_STATES; i++) {
 439         if (s->states[i].in_use) {
 440             curl_clean_state(&s->states[i]);
 441         }
 442         if (s->states[i].curl) {
 443             curl_easy_cleanup(s->states[i].curl);
 444             s->states[i].curl = NULL;
 445         }
 446         g_free(s->states[i].orig_buf);
 447         s->states[i].orig_buf = NULL;
 448     }
 449     if (s->multi) {
 450         curl_multi_cleanup(s->multi);
 451         s->multi = NULL;
 452     }
 453
 454     timer_del(&s->timer);
 455 }
 456
 457 static void curl_attach_aio_context(BlockDriverState *bs,
 458                                     AioContext *new_context)
 459 {
 460     BDRVCURLState *s = bs->opaque;
 461
 462     aio_timer_init(new_context, &s->timer,
 463                    QEMU_CLOCK_REALTIME, SCALE_NS,
 464                    curl_multi_timeout_do, s);
 465
 466     assert(!s->multi);
 467     s->multi = curl_multi_init();
 468     s->aio_context = new_context;
 469     curl_multi_setopt(s->multi, CURLMOPT_SOCKETFUNCTION, curl_sock_cb);
 470 #ifdef NEED_CURL_TIMER_CALLBACK
 471     curl_multi_setopt(s->multi, CURLMOPT_TIMERDATA, s);
 472     curl_multi_setopt(s->multi, CURLMOPT_TIMERFUNCTION, curl_timer_cb);
 473 #endif
 474 }
 475
 476 static QemuOptsList runtime_opts = {
 477     .name = "curl",
 478     .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
 479     .desc = {
 480         {
 481             .name = CURL_BLOCK_OPT_URL,
 482             .type = QEMU_OPT_STRING,
 483             .help = "URL to open",
 484         },
 485         {
 486             .name = CURL_BLOCK_OPT_READAHEAD,
 487             .type = QEMU_OPT_SIZE,
 488             .help = "Readahead size",
 489         },
 490         {
 491             .name = CURL_BLOCK_OPT_SSLVERIFY,
 492             .type = QEMU_OPT_BOOL,
 493             .help = "Verify SSL certificate"
 494         },
 495         {
 496             .name = CURL_BLOCK_OPT_TIMEOUT,
 497             .type = QEMU_OPT_NUMBER,
 498             .help = "Curl timeout"
 499         },
 500         { /* end of list */ }
 501     },
 502 };
 503
 504 static int curl_open(BlockDriverState *bs, QDict *options, int flags,
 505                      Error **errp)
 506 {
 507     BDRVCURLState *s = bs->opaque;
 508     CURLState *state = NULL;
 509     QemuOpts *opts;
 510     Error *local_err = NULL;
 511     const char *file;
 512     double d;
 513
 514     static int inited = 0;
 515
 516     if (flags & BDRV_O_RDWR) {
 517         error_setg(errp, "curl block device does not support writes");
 518         return -EROFS;
 519     }
 520
 521     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
 522     qemu_opts_absorb_qdict(opts, options, &local_err);
 523     if (local_err) {
 524         error_propagate(errp, local_err);
 525         goto out_noclean;
 526     }
 527
 528     s->readahead_size = qemu_opt_get_size(opts, CURL_BLOCK_OPT_READAHEAD,
 529                                           READ_AHEAD_DEFAULT);
 530     if ((s->readahead_size & 0x1ff) != 0) {
 531         error_setg(errp, "HTTP_READAHEAD_SIZE %zd is not a multiple of 512",
 532                    s->readahead_size);
 533         goto out_noclean;
 534     }
 535
 536     s->timeout = qemu_opt_get_number(opts, CURL_BLOCK_OPT_TIMEOUT,
 537                                      CURL_TIMEOUT_DEFAULT);
 538
 539     s->sslverify = qemu_opt_get_bool(opts, CURL_BLOCK_OPT_SSLVERIFY, true);
 540
 541     file = qemu_opt_get(opts, CURL_BLOCK_OPT_URL);
 542     if (file == NULL) {
 543         error_setg(errp, "curl block driver requires an 'url' option");
 544         goto out_noclean;
 545     }
 546
 547     if (!inited) {
 548         curl_global_init(CURL_GLOBAL_ALL);
 549         inited = 1;
 550     }
 551
 552     DPRINTF("CURL: Opening %s\n", file);
 553     s->aio_context = bdrv_get_aio_context(bs);
 554     s->url = g_strdup(file);
 555     state = curl_init_state(s);
 556     if (!state)
 557         goto out_noclean;
 558
 559     // Get file size
 560
 561     s->accept_range = false;
 562     curl_easy_setopt(state->curl, CURLOPT_NOBODY, 1);
 563     curl_easy_setopt(state->curl, CURLOPT_HEADERFUNCTION,
 564                      curl_header_cb);
 565     curl_easy_setopt(state->curl, CURLOPT_HEADERDATA, s);
 566     if (curl_easy_perform(state->curl))
 567         goto out;
 568     curl_easy_getinfo(state->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &d);
 569     if (d)
 570         s->len = (size_t)d;
 571     else if(!s->len)
 572         goto out;
 573     if ((!strncasecmp(s->url, "http://", strlen("http://"))
 574         || !strncasecmp(s->url, "https://", strlen("https://")))
 575         && !s->accept_range) {
 576         pstrcpy(state->errmsg, CURL_ERROR_SIZE,
 577                 "Server does not support 'range' (byte ranges).");
 578         goto out;
 579     }
 580     DPRINTF("CURL: Size = %zd\n", s->len);
 581
 582     curl_clean_state(state);
 583     curl_easy_cleanup(state->curl);
 584     state->curl = NULL;
 585
 586     curl_attach_aio_context(bs, bdrv_get_aio_context(bs));
 587
 588     qemu_opts_del(opts);
 589     return 0;
 590
 591 out:
 592     error_setg(errp, "CURL: Error opening file: %s", state->errmsg);
 593     curl_easy_cleanup(state->curl);
 594     state->curl = NULL;
 595 out_noclean:
 596     g_free(s->url);
 597     qemu_opts_del(opts);
 598     return -EINVAL;
 599 }
 600
 601 static void curl_aio_cancel(BlockDriverAIOCB *blockacb)
 602 {
 603     // Do we have to implement canceling? Seems to work without...
 604 }
 605
 606 static const AIOCBInfo curl_aiocb_info = {
 607     .aiocb_size         = sizeof(CURLAIOCB),
 608     .cancel             = curl_aio_cancel,
 609 };
 610
 611
 612 static void curl_readv_bh_cb(void *p)
 613 {
 614     CURLState *state;
 615     int running;
 616
 617     CURLAIOCB *acb = p;
 618     BDRVCURLState *s = acb->common.bs->opaque;
 619
 620     qemu_bh_delete(acb->bh);
 621     acb->bh = NULL;
 622
 623     size_t start = acb->sector_num * SECTOR_SIZE;
 624     size_t end;
 625
 626     // In case we have the requested data already (e.g. read-ahead),
 627     // we can just call the callback and be done.
 628     switch (curl_find_buf(s, start, acb->nb_sectors * SECTOR_SIZE, acb)) {
 629         case FIND_RET_OK:
 630             qemu_aio_release(acb);
 631             // fall through
 632         case FIND_RET_WAIT:
 633             return;
 634         default:
 635             break;
 636     }
 637
 638     // No cache found, so let's start a new request
 639     state = curl_init_state(s);
 640     if (!state) {
 641         acb->common.cb(acb->common.opaque, -EIO);
 642         qemu_aio_release(acb);
 643         return;
 644     }
 645
 646     acb->start = 0;
 647     acb->end = (acb->nb_sectors * SECTOR_SIZE);
 648
 649     state->buf_off = 0;
 650     g_free(state->orig_buf);
 651     state->buf_start = start;
 652     state->buf_len = acb->end + s->readahead_size;
 653     end = MIN(start + state->buf_len, s->len) - 1;
 654     state->orig_buf = g_try_malloc(state->buf_len);
 655     if (state->buf_len && state->orig_buf == NULL) {
 656         curl_clean_state(state);
 657         acb->common.cb(acb->common.opaque, -ENOMEM);
 658         qemu_aio_release(acb);
 659         return;
 660     }
 661     state->acb[0] = acb;
 662
 663     snprintf(state->range, 127, "%zd-%zd", start, end);
 664     DPRINTF("CURL (AIO): Reading %d at %zd (%s)\n",
 665             (acb->nb_sectors * SECTOR_SIZE), start, state->range);
 666     curl_easy_setopt(state->curl, CURLOPT_RANGE, state->range);
 667
 668     curl_multi_add_handle(s->multi, state->curl);
 669
 670     /* Tell curl it needs to kick things off */
 671     curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running);
 672 }
 673
 674 static BlockDriverAIOCB *curl_aio_readv(BlockDriverState *bs,
 675         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 676         BlockDriverCompletionFunc *cb, void *opaque)
 677 {
 678     CURLAIOCB *acb;
 679
 680     acb = qemu_aio_get(&curl_aiocb_info, bs, cb, opaque);
 681
 682     acb->qiov = qiov;
 683     acb->sector_num = sector_num;
 684     acb->nb_sectors = nb_sectors;
 685
 686     acb->bh = aio_bh_new(bdrv_get_aio_context(bs), curl_readv_bh_cb, acb);
 687     qemu_bh_schedule(acb->bh);
 688     return &acb->common;
 689 }
 690
 691 static void curl_close(BlockDriverState *bs)
 692 {
 693     BDRVCURLState *s = bs->opaque;
 694
 695     DPRINTF("CURL: Close\n");
 696     curl_detach_aio_context(bs);
 697
 698     g_free(s->url);
 699 }
 700
 701 static int64_t curl_getlength(BlockDriverState *bs)
 702 {
 703     BDRVCURLState *s = bs->opaque;
 704     return s->len;
 705 }
 706
 707 static BlockDriver bdrv_http = {
 708     .format_name                = "http",
 709     .protocol_name              = "http",
 710
 711     .instance_size              = sizeof(BDRVCURLState),
 712     .bdrv_parse_filename        = curl_parse_filename,
 713     .bdrv_file_open             = curl_open,
 714     .bdrv_close                 = curl_close,
 715     .bdrv_getlength             = curl_getlength,
 716
 717     .bdrv_aio_readv             = curl_aio_readv,
 718
 719     .bdrv_detach_aio_context    = curl_detach_aio_context,
 720     .bdrv_attach_aio_context    = curl_attach_aio_context,
 721 };
 722
 723 static BlockDriver bdrv_https = {
 724     .format_name                = "https",
 725     .protocol_name              = "https",
 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     .bdrv_detach_aio_context    = curl_detach_aio_context,
 736     .bdrv_attach_aio_context    = curl_attach_aio_context,
 737 };
 738
 739 static BlockDriver bdrv_ftp = {
 740     .format_name                = "ftp",
 741     .protocol_name              = "ftp",
 742
 743     .instance_size              = sizeof(BDRVCURLState),
 744     .bdrv_parse_filename        = curl_parse_filename,
 745     .bdrv_file_open             = curl_open,
 746     .bdrv_close                 = curl_close,
 747     .bdrv_getlength             = curl_getlength,
 748
 749     .bdrv_aio_readv             = curl_aio_readv,
 750
 751     .bdrv_detach_aio_context    = curl_detach_aio_context,
 752     .bdrv_attach_aio_context    = curl_attach_aio_context,
 753 };
 754
 755 static BlockDriver bdrv_ftps = {
 756     .format_name                = "ftps",
 757     .protocol_name              = "ftps",
 758
 759     .instance_size              = sizeof(BDRVCURLState),
 760     .bdrv_parse_filename        = curl_parse_filename,
 761     .bdrv_file_open             = curl_open,
 762     .bdrv_close                 = curl_close,
 763     .bdrv_getlength             = curl_getlength,
 764
 765     .bdrv_aio_readv             = curl_aio_readv,
 766
 767     .bdrv_detach_aio_context    = curl_detach_aio_context,
 768     .bdrv_attach_aio_context    = curl_attach_aio_context,
 769 };
 770
 771 static BlockDriver bdrv_tftp = {
 772     .format_name                = "tftp",
 773     .protocol_name              = "tftp",
 774
 775     .instance_size              = sizeof(BDRVCURLState),
 776     .bdrv_parse_filename        = curl_parse_filename,
 777     .bdrv_file_open             = curl_open,
 778     .bdrv_close                 = curl_close,
 779     .bdrv_getlength             = curl_getlength,
 780
 781     .bdrv_aio_readv             = curl_aio_readv,
 782
 783     .bdrv_detach_aio_context    = curl_detach_aio_context,
 784     .bdrv_attach_aio_context    = curl_attach_aio_context,
 785 };
 786
 787 static void curl_block_init(void)
 788 {
 789     bdrv_register(&bdrv_http);
 790     bdrv_register(&bdrv_https);
 791     bdrv_register(&bdrv_ftp);
 792     bdrv_register(&bdrv_ftps);
 793     bdrv_register(&bdrv_tftp);
 794 }
 795
 796 block_init(curl_block_init);