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 "qapi/qmp/qstring.h"
  28 #include <curl/curl.h>
  29
  30 // #define DEBUG_CURL
  31 // #define DEBUG_VERBOSE
  32
  33 #ifdef DEBUG_CURL
  34 #define DPRINTF(fmt, ...) do { printf(fmt, ## __VA_ARGS__); } while (0)
  35 #else
  36 #define DPRINTF(fmt, ...) do { } while (0)
  37 #endif
  38
  39 #if LIBCURL_VERSION_NUM >= 0x071000
  40 /* The multi interface timer callback was introduced in 7.16.0 */
  41 #define NEED_CURL_TIMER_CALLBACK
  42 #define HAVE_SOCKET_ACTION
  43 #endif
  44
  45 #ifndef HAVE_SOCKET_ACTION
  46 /* If curl_multi_socket_action isn't available, define it statically here in
  47  * terms of curl_multi_socket. Note that ev_bitmask will be ignored, which is
  48  * less efficient but still safe. */
  49 static CURLMcode __curl_multi_socket_action(CURLM *multi_handle,
  50                                             curl_socket_t sockfd,
  51                                             int ev_bitmask,
  52                                             int *running_handles)
  53 {
  54     return curl_multi_socket(multi_handle, sockfd, running_handles);
  55 }
  56 #define curl_multi_socket_action __curl_multi_socket_action
  57 #endif
  58
  59 #define PROTOCOLS (CURLPROTO_HTTP | CURLPROTO_HTTPS | \
  60                    CURLPROTO_FTP | CURLPROTO_FTPS | \
  61                    CURLPROTO_TFTP)
  62
  63 #define CURL_NUM_STATES 8
  64 #define CURL_NUM_ACB    8
  65 #define SECTOR_SIZE     512
  66 #define READ_AHEAD_DEFAULT (256 * 1024)
  67 #define CURL_TIMEOUT_DEFAULT 5
  68 #define CURL_TIMEOUT_MAX 10000
  69
  70 #define FIND_RET_NONE   0
  71 #define FIND_RET_OK     1
  72 #define FIND_RET_WAIT   2
  73
  74 #define CURL_BLOCK_OPT_URL       "url"
  75 #define CURL_BLOCK_OPT_READAHEAD "readahead"
  76 #define CURL_BLOCK_OPT_SSLVERIFY "sslverify"
  77 #define CURL_BLOCK_OPT_TIMEOUT "timeout"
  78 #define CURL_BLOCK_OPT_COOKIE    "cookie"
  79
  80 struct BDRVCURLState;
  81
  82 typedef struct CURLAIOCB {
  83     BlockAIOCB common;
  84     QEMUBH *bh;
  85     QEMUIOVector *qiov;
  86
  87     int64_t sector_num;
  88     int nb_sectors;
  89
  90     size_t start;
  91     size_t end;
  92 } CURLAIOCB;
  93
  94 typedef struct CURLState
  95 {
  96     struct BDRVCURLState *s;
  97     CURLAIOCB *acb[CURL_NUM_ACB];
  98     CURL *curl;
  99     curl_socket_t sock_fd;
 100     char *orig_buf;
 101     size_t buf_start;
 102     size_t buf_off;
 103     size_t buf_len;
 104     char range[128];
 105     char errmsg[CURL_ERROR_SIZE];
 106     char in_use;
 107 } CURLState;
 108
 109 typedef struct BDRVCURLState {
 110     CURLM *multi;
 111     QEMUTimer timer;
 112     size_t len;
 113     CURLState states[CURL_NUM_STATES];
 114     char *url;
 115     size_t readahead_size;
 116     bool sslverify;
 117     uint64_t timeout;
 118     char *cookie;
 119     bool accept_range;
 120     AioContext *aio_context;
 121 } BDRVCURLState;
 122
 123 static void curl_clean_state(CURLState *s);
 124 static void curl_multi_do(void *arg);
 125 static void curl_multi_read(void *arg);
 126
 127 #ifdef NEED_CURL_TIMER_CALLBACK
 128 static int curl_timer_cb(CURLM *multi, long timeout_ms, void *opaque)
 129 {
 130     BDRVCURLState *s = opaque;
 131
 132     DPRINTF("CURL: timer callback timeout_ms %ld\n", timeout_ms);
 133     if (timeout_ms == -1) {
 134         timer_del(&s->timer);
 135     } else {
 136         int64_t timeout_ns = (int64_t)timeout_ms * 1000 * 1000;
 137         timer_mod(&s->timer,
 138                   qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + timeout_ns);
 139     }
 140     return 0;
 141 }
 142 #endif
 143
 144 static int curl_sock_cb(CURL *curl, curl_socket_t fd, int action,
 145                         void *userp, void *sp)
 146 {
 147     BDRVCURLState *s;
 148     CURLState *state = NULL;
 149     curl_easy_getinfo(curl, CURLINFO_PRIVATE, (char **)&state);
 150     state->sock_fd = fd;
 151     s = state->s;
 152
 153     DPRINTF("CURL (AIO): Sock action %d on fd %d\n", action, fd);
 154     switch (action) {
 155         case CURL_POLL_IN:
 156             aio_set_fd_handler(s->aio_context, fd, curl_multi_read,
 157                                NULL, state);
 158             break;
 159         case CURL_POLL_OUT:
 160             aio_set_fd_handler(s->aio_context, fd, NULL, curl_multi_do, state);
 161             break;
 162         case CURL_POLL_INOUT:
 163             aio_set_fd_handler(s->aio_context, fd, curl_multi_read,
 164                                curl_multi_do, state);
 165             break;
 166         case CURL_POLL_REMOVE:
 167             aio_set_fd_handler(s->aio_context, fd, NULL, NULL, NULL);
 168             break;
 169     }
 170
 171     return 0;
 172 }
 173
 174 static size_t curl_header_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
 175 {
 176     BDRVCURLState *s = opaque;
 177     size_t realsize = size * nmemb;
 178     const char *accept_line = "Accept-Ranges: bytes";
 179
 180     if (realsize >= strlen(accept_line)
 181         && strncmp((char *)ptr, accept_line, strlen(accept_line)) == 0) {
 182         s->accept_range = true;
 183     }
 184
 185     return realsize;
 186 }
 187
 188 static size_t curl_read_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
 189 {
 190     CURLState *s = ((CURLState*)opaque);
 191     size_t realsize = size * nmemb;
 192     int i;
 193
 194     DPRINTF("CURL: Just reading %zd bytes\n", realsize);
 195
 196     if (!s || !s->orig_buf)
 197         return 0;
 198
 199     if (s->buf_off >= s->buf_len) {
 200         /* buffer full, read nothing */
 201         return 0;
 202     }
 203     realsize = MIN(realsize, s->buf_len - s->buf_off);
 204     memcpy(s->orig_buf + s->buf_off, ptr, realsize);
 205     s->buf_off += realsize;
 206
 207     for(i=0; i<CURL_NUM_ACB; i++) {
 208         CURLAIOCB *acb = s->acb[i];
 209
 210         if (!acb)
 211             continue;
 212
 213         if ((s->buf_off >= acb->end)) {
 214             qemu_iovec_from_buf(acb->qiov, 0, s->orig_buf + acb->start,
 215                                 acb->end - acb->start);
 216             acb->common.cb(acb->common.opaque, 0);
 217             qemu_aio_unref(acb);
 218             s->acb[i] = NULL;
 219         }
 220     }
 221
 222     return realsize;
 223 }
 224
 225 static int curl_find_buf(BDRVCURLState *s, size_t start, size_t len,
 226                          CURLAIOCB *acb)
 227 {
 228     int i;
 229     size_t end = start + len;
 230
 231     for (i=0; i<CURL_NUM_STATES; i++) {
 232         CURLState *state = &s->states[i];
 233         size_t buf_end = (state->buf_start + state->buf_off);
 234         size_t buf_fend = (state->buf_start + state->buf_len);
 235
 236         if (!state->orig_buf)
 237             continue;
 238         if (!state->buf_off)
 239             continue;
 240
 241         // Does the existing buffer cover our section?
 242         if ((start >= state->buf_start) &&
 243             (start <= buf_end) &&
 244             (end >= state->buf_start) &&
 245             (end <= buf_end))
 246         {
 247             char *buf = state->orig_buf + (start - state->buf_start);
 248
 249             qemu_iovec_from_buf(acb->qiov, 0, buf, len);
 250             acb->common.cb(acb->common.opaque, 0);
 251
 252             return FIND_RET_OK;
 253         }
 254
 255         // Wait for unfinished chunks
 256         if (state->in_use &&
 257             (start >= state->buf_start) &&
 258             (start <= buf_fend) &&
 259             (end >= state->buf_start) &&
 260             (end <= buf_fend))
 261         {
 262             int j;
 263
 264             acb->start = start - state->buf_start;
 265             acb->end = acb->start + len;
 266
 267             for (j=0; j<CURL_NUM_ACB; j++) {
 268                 if (!state->acb[j]) {
 269                     state->acb[j] = acb;
 270                     return FIND_RET_WAIT;
 271                 }
 272             }
 273         }
 274     }
 275
 276     return FIND_RET_NONE;
 277 }
 278
 279 static void curl_multi_check_completion(BDRVCURLState *s)
 280 {
 281     int msgs_in_queue;
 282
 283     /* Try to find done transfers, so we can free the easy
 284      * handle again. */
 285     for (;;) {
 286         CURLMsg *msg;
 287         msg = curl_multi_info_read(s->multi, &msgs_in_queue);
 288
 289         /* Quit when there are no more completions */
 290         if (!msg)
 291             break;
 292
 293         if (msg->msg == CURLMSG_DONE) {
 294             CURLState *state = NULL;
 295             curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE,
 296                               (char **)&state);
 297
 298             /* ACBs for successful messages get completed in curl_read_cb */
 299             if (msg->data.result != CURLE_OK) {
 300                 int i;
 301                 for (i = 0; i < CURL_NUM_ACB; i++) {
 302                     CURLAIOCB *acb = state->acb[i];
 303
 304                     if (acb == NULL) {
 305                         continue;
 306                     }
 307
 308                     acb->common.cb(acb->common.opaque, -EIO);
 309                     qemu_aio_unref(acb);
 310                     state->acb[i] = NULL;
 311                 }
 312             }
 313
 314             curl_clean_state(state);
 315             break;
 316         }
 317     }
 318 }
 319
 320 static void curl_multi_do(void *arg)
 321 {
 322     CURLState *s = (CURLState *)arg;
 323     int running;
 324     int r;
 325
 326     if (!s->s->multi) {
 327         return;
 328     }
 329
 330     do {
 331         r = curl_multi_socket_action(s->s->multi, s->sock_fd, 0, &running);
 332     } while(r == CURLM_CALL_MULTI_PERFORM);
 333
 334 }
 335
 336 static void curl_multi_read(void *arg)
 337 {
 338     CURLState *s = (CURLState *)arg;
 339
 340     curl_multi_do(arg);
 341     curl_multi_check_completion(s->s);
 342 }
 343
 344 static void curl_multi_timeout_do(void *arg)
 345 {
 346 #ifdef NEED_CURL_TIMER_CALLBACK
 347     BDRVCURLState *s = (BDRVCURLState *)arg;
 348     int running;
 349
 350     if (!s->multi) {
 351         return;
 352     }
 353
 354     curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running);
 355
 356     curl_multi_check_completion(s);
 357 #else
 358     abort();
 359 #endif
 360 }
 361
 362 static CURLState *curl_init_state(BlockDriverState *bs, BDRVCURLState *s)
 363 {
 364     CURLState *state = NULL;
 365     int i, j;
 366
 367     do {
 368         for (i=0; i<CURL_NUM_STATES; i++) {
 369             for (j=0; j<CURL_NUM_ACB; j++)
 370                 if (s->states[i].acb[j])
 371                     continue;
 372             if (s->states[i].in_use)
 373                 continue;
 374
 375             state = &s->states[i];
 376             state->in_use = 1;
 377             break;
 378         }
 379         if (!state) {
 380             aio_poll(bdrv_get_aio_context(bs), true);
 381         }
 382     } while(!state);
 383
 384     if (!state->curl) {
 385         state->curl = curl_easy_init();
 386         if (!state->curl) {
 387             return NULL;
 388         }
 389         curl_easy_setopt(state->curl, CURLOPT_URL, s->url);
 390         curl_easy_setopt(state->curl, CURLOPT_SSL_VERIFYPEER,
 391                          (long) s->sslverify);
 392         if (s->cookie) {
 393             curl_easy_setopt(state->curl, CURLOPT_COOKIE, s->cookie);
 394         }
 395         curl_easy_setopt(state->curl, CURLOPT_TIMEOUT, (long)s->timeout);
 396         curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION,
 397                          (void *)curl_read_cb);
 398         curl_easy_setopt(state->curl, CURLOPT_WRITEDATA, (void *)state);
 399         curl_easy_setopt(state->curl, CURLOPT_PRIVATE, (void *)state);
 400         curl_easy_setopt(state->curl, CURLOPT_AUTOREFERER, 1);
 401         curl_easy_setopt(state->curl, CURLOPT_FOLLOWLOCATION, 1);
 402         curl_easy_setopt(state->curl, CURLOPT_NOSIGNAL, 1);
 403         curl_easy_setopt(state->curl, CURLOPT_ERRORBUFFER, state->errmsg);
 404         curl_easy_setopt(state->curl, CURLOPT_FAILONERROR, 1);
 405
 406         /* Restrict supported protocols to avoid security issues in the more
 407          * obscure protocols.  For example, do not allow POP3/SMTP/IMAP see
 408          * CVE-2013-0249.
 409          *
 410          * Restricting protocols is only supported from 7.19.4 upwards.
 411          */
 412 #if LIBCURL_VERSION_NUM >= 0x071304
 413         curl_easy_setopt(state->curl, CURLOPT_PROTOCOLS, PROTOCOLS);
 414         curl_easy_setopt(state->curl, CURLOPT_REDIR_PROTOCOLS, PROTOCOLS);
 415 #endif
 416
 417 #ifdef DEBUG_VERBOSE
 418         curl_easy_setopt(state->curl, CURLOPT_VERBOSE, 1);
 419 #endif
 420     }
 421
 422     state->s = s;
 423
 424     return state;
 425 }
 426
 427 static void curl_clean_state(CURLState *s)
 428 {
 429     if (s->s->multi)
 430         curl_multi_remove_handle(s->s->multi, s->curl);
 431     s->in_use = 0;
 432 }
 433
 434 static void curl_parse_filename(const char *filename, QDict *options,
 435                                 Error **errp)
 436 {
 437     qdict_put(options, CURL_BLOCK_OPT_URL, qstring_from_str(filename));
 438 }
 439
 440 static void curl_detach_aio_context(BlockDriverState *bs)
 441 {
 442     BDRVCURLState *s = bs->opaque;
 443     int i;
 444
 445     for (i = 0; i < CURL_NUM_STATES; i++) {
 446         if (s->states[i].in_use) {
 447             curl_clean_state(&s->states[i]);
 448         }
 449         if (s->states[i].curl) {
 450             curl_easy_cleanup(s->states[i].curl);
 451             s->states[i].curl = NULL;
 452         }
 453         g_free(s->states[i].orig_buf);
 454         s->states[i].orig_buf = NULL;
 455     }
 456     if (s->multi) {
 457         curl_multi_cleanup(s->multi);
 458         s->multi = NULL;
 459     }
 460
 461     timer_del(&s->timer);
 462 }
 463
 464 static void curl_attach_aio_context(BlockDriverState *bs,
 465                                     AioContext *new_context)
 466 {
 467     BDRVCURLState *s = bs->opaque;
 468
 469     aio_timer_init(new_context, &s->timer,
 470                    QEMU_CLOCK_REALTIME, SCALE_NS,
 471                    curl_multi_timeout_do, s);
 472
 473     assert(!s->multi);
 474     s->multi = curl_multi_init();
 475     s->aio_context = new_context;
 476     curl_multi_setopt(s->multi, CURLMOPT_SOCKETFUNCTION, curl_sock_cb);
 477 #ifdef NEED_CURL_TIMER_CALLBACK
 478     curl_multi_setopt(s->multi, CURLMOPT_TIMERDATA, s);
 479     curl_multi_setopt(s->multi, CURLMOPT_TIMERFUNCTION, curl_timer_cb);
 480 #endif
 481 }
 482
 483 static QemuOptsList runtime_opts = {
 484     .name = "curl",
 485     .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
 486     .desc = {
 487         {
 488             .name = CURL_BLOCK_OPT_URL,
 489             .type = QEMU_OPT_STRING,
 490             .help = "URL to open",
 491         },
 492         {
 493             .name = CURL_BLOCK_OPT_READAHEAD,
 494             .type = QEMU_OPT_SIZE,
 495             .help = "Readahead size",
 496         },
 497         {
 498             .name = CURL_BLOCK_OPT_SSLVERIFY,
 499             .type = QEMU_OPT_BOOL,
 500             .help = "Verify SSL certificate"
 501         },
 502         {
 503             .name = CURL_BLOCK_OPT_TIMEOUT,
 504             .type = QEMU_OPT_NUMBER,
 505             .help = "Curl timeout"
 506         },
 507         {
 508             .name = CURL_BLOCK_OPT_COOKIE,
 509             .type = QEMU_OPT_STRING,
 510             .help = "Pass the cookie or list of cookies with each request"
 511         },
 512         { /* end of list */ }
 513     },
 514 };
 515
 516 static int curl_open(BlockDriverState *bs, QDict *options, int flags,
 517                      Error **errp)
 518 {
 519     BDRVCURLState *s = bs->opaque;
 520     CURLState *state = NULL;
 521     QemuOpts *opts;
 522     Error *local_err = NULL;
 523     const char *file;
 524     const char *cookie;
 525     double d;
 526
 527     static int inited = 0;
 528
 529     if (flags & BDRV_O_RDWR) {
 530         error_setg(errp, "curl block device does not support writes");
 531         return -EROFS;
 532     }
 533
 534     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
 535     qemu_opts_absorb_qdict(opts, options, &local_err);
 536     if (local_err) {
 537         error_propagate(errp, local_err);
 538         goto out_noclean;
 539     }
 540
 541     s->readahead_size = qemu_opt_get_size(opts, CURL_BLOCK_OPT_READAHEAD,
 542                                           READ_AHEAD_DEFAULT);
 543     if ((s->readahead_size & 0x1ff) != 0) {
 544         error_setg(errp, "HTTP_READAHEAD_SIZE %zd is not a multiple of 512",
 545                    s->readahead_size);
 546         goto out_noclean;
 547     }
 548
 549     s->timeout = qemu_opt_get_number(opts, CURL_BLOCK_OPT_TIMEOUT,
 550                                      CURL_TIMEOUT_DEFAULT);
 551     if (s->timeout > CURL_TIMEOUT_MAX) {
 552         error_setg(errp, "timeout parameter is too large or negative");
 553         goto out_noclean;
 554     }
 555
 556     s->sslverify = qemu_opt_get_bool(opts, CURL_BLOCK_OPT_SSLVERIFY, true);
 557
 558     cookie = qemu_opt_get(opts, CURL_BLOCK_OPT_COOKIE);
 559     s->cookie = g_strdup(cookie);
 560
 561     file = qemu_opt_get(opts, CURL_BLOCK_OPT_URL);
 562     if (file == NULL) {
 563         error_setg(errp, "curl block driver requires an 'url' option");
 564         goto out_noclean;
 565     }
 566
 567     if (!inited) {
 568         curl_global_init(CURL_GLOBAL_ALL);
 569         inited = 1;
 570     }
 571
 572     DPRINTF("CURL: Opening %s\n", file);
 573     s->aio_context = bdrv_get_aio_context(bs);
 574     s->url = g_strdup(file);
 575     state = curl_init_state(bs, s);
 576     if (!state)
 577         goto out_noclean;
 578
 579     // Get file size
 580
 581     s->accept_range = false;
 582     curl_easy_setopt(state->curl, CURLOPT_NOBODY, 1);
 583     curl_easy_setopt(state->curl, CURLOPT_HEADERFUNCTION,
 584                      curl_header_cb);
 585     curl_easy_setopt(state->curl, CURLOPT_HEADERDATA, s);
 586     if (curl_easy_perform(state->curl))
 587         goto out;
 588     curl_easy_getinfo(state->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &d);
 589     if (d)
 590         s->len = (size_t)d;
 591     else if(!s->len)
 592         goto out;
 593     if ((!strncasecmp(s->url, "http://", strlen("http://"))
 594         || !strncasecmp(s->url, "https://", strlen("https://")))
 595         && !s->accept_range) {
 596         pstrcpy(state->errmsg, CURL_ERROR_SIZE,
 597                 "Server does not support 'range' (byte ranges).");
 598         goto out;
 599     }
 600     DPRINTF("CURL: Size = %zd\n", s->len);
 601
 602     curl_clean_state(state);
 603     curl_easy_cleanup(state->curl);
 604     state->curl = NULL;
 605
 606     curl_attach_aio_context(bs, bdrv_get_aio_context(bs));
 607
 608     qemu_opts_del(opts);
 609     return 0;
 610
 611 out:
 612     error_setg(errp, "CURL: Error opening file: %s", state->errmsg);
 613     curl_easy_cleanup(state->curl);
 614     state->curl = NULL;
 615 out_noclean:
 616     g_free(s->cookie);
 617     g_free(s->url);
 618     qemu_opts_del(opts);
 619     return -EINVAL;
 620 }
 621
 622 static const AIOCBInfo curl_aiocb_info = {
 623     .aiocb_size         = sizeof(CURLAIOCB),
 624 };
 625
 626
 627 static void curl_readv_bh_cb(void *p)
 628 {
 629     CURLState *state;
 630     int running;
 631
 632     CURLAIOCB *acb = p;
 633     BDRVCURLState *s = acb->common.bs->opaque;
 634
 635     qemu_bh_delete(acb->bh);
 636     acb->bh = NULL;
 637
 638     size_t start = acb->sector_num * SECTOR_SIZE;
 639     size_t end;
 640
 641     // In case we have the requested data already (e.g. read-ahead),
 642     // we can just call the callback and be done.
 643     switch (curl_find_buf(s, start, acb->nb_sectors * SECTOR_SIZE, acb)) {
 644         case FIND_RET_OK:
 645             qemu_aio_unref(acb);
 646             // fall through
 647         case FIND_RET_WAIT:
 648             return;
 649         default:
 650             break;
 651     }
 652
 653     // No cache found, so let's start a new request
 654     state = curl_init_state(acb->common.bs, s);
 655     if (!state) {
 656         acb->common.cb(acb->common.opaque, -EIO);
 657         qemu_aio_unref(acb);
 658         return;
 659     }
 660
 661     acb->start = 0;
 662     acb->end = (acb->nb_sectors * SECTOR_SIZE);
 663
 664     state->buf_off = 0;
 665     g_free(state->orig_buf);
 666     state->buf_start = start;
 667     state->buf_len = acb->end + s->readahead_size;
 668     end = MIN(start + state->buf_len, s->len) - 1;
 669     state->orig_buf = g_try_malloc(state->buf_len);
 670     if (state->buf_len && state->orig_buf == NULL) {
 671         curl_clean_state(state);
 672         acb->common.cb(acb->common.opaque, -ENOMEM);
 673         qemu_aio_unref(acb);
 674         return;
 675     }
 676     state->acb[0] = acb;
 677
 678     snprintf(state->range, 127, "%zd-%zd", start, end);
 679     DPRINTF("CURL (AIO): Reading %d at %zd (%s)\n",
 680             (acb->nb_sectors * SECTOR_SIZE), start, state->range);
 681     curl_easy_setopt(state->curl, CURLOPT_RANGE, state->range);
 682
 683     curl_multi_add_handle(s->multi, state->curl);
 684
 685     /* Tell curl it needs to kick things off */
 686     curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running);
 687 }
 688
 689 static BlockAIOCB *curl_aio_readv(BlockDriverState *bs,
 690         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 691         BlockCompletionFunc *cb, void *opaque)
 692 {
 693     CURLAIOCB *acb;
 694
 695     acb = qemu_aio_get(&curl_aiocb_info, bs, cb, opaque);
 696
 697     acb->qiov = qiov;
 698     acb->sector_num = sector_num;
 699     acb->nb_sectors = nb_sectors;
 700
 701     acb->bh = aio_bh_new(bdrv_get_aio_context(bs), curl_readv_bh_cb, acb);
 702     qemu_bh_schedule(acb->bh);
 703     return &acb->common;
 704 }
 705
 706 static void curl_close(BlockDriverState *bs)
 707 {
 708     BDRVCURLState *s = bs->opaque;
 709
 710     DPRINTF("CURL: Close\n");
 711     curl_detach_aio_context(bs);
 712
 713     g_free(s->cookie);
 714     g_free(s->url);
 715 }
 716
 717 static int64_t curl_getlength(BlockDriverState *bs)
 718 {
 719     BDRVCURLState *s = bs->opaque;
 720     return s->len;
 721 }
 722
 723 static BlockDriver bdrv_http = {
 724     .format_name                = "http",
 725     .protocol_name              = "http",
 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_https = {
 740     .format_name                = "https",
 741     .protocol_name              = "https",
 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_ftp = {
 756     .format_name                = "ftp",
 757     .protocol_name              = "ftp",
 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_ftps = {
 772     .format_name                = "ftps",
 773     .protocol_name              = "ftps",
 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 BlockDriver bdrv_tftp = {
 788     .format_name                = "tftp",
 789     .protocol_name              = "tftp",
 790
 791     .instance_size              = sizeof(BDRVCURLState),
 792     .bdrv_parse_filename        = curl_parse_filename,
 793     .bdrv_file_open             = curl_open,
 794     .bdrv_close                 = curl_close,
 795     .bdrv_getlength             = curl_getlength,
 796
 797     .bdrv_aio_readv             = curl_aio_readv,
 798
 799     .bdrv_detach_aio_context    = curl_detach_aio_context,
 800     .bdrv_attach_aio_context    = curl_attach_aio_context,
 801 };
 802
 803 static void curl_block_init(void)
 804 {
 805     bdrv_register(&bdrv_http);
 806     bdrv_register(&bdrv_https);
 807     bdrv_register(&bdrv_ftp);
 808     bdrv_register(&bdrv_ftps);
 809     bdrv_register(&bdrv_tftp);
 810 }
 811
 812 block_init(curl_block_init);