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 "qemu/error-report.h" 26 #include "block/block_int.h" 27 #include "qapi/qmp/qbool.h" 28 #include "qapi/qmp/qstring.h" 29 #include <curl/curl.h> 30 31 // #define DEBUG_CURL 32 // #define DEBUG_VERBOSE 33 34 #ifdef DEBUG_CURL 35 #define DPRINTF(fmt, ...) do { printf(fmt, ## __VA_ARGS__); } while (0) 36 #else 37 #define DPRINTF(fmt, ...) do { } while (0) 38 #endif 39 40 #if LIBCURL_VERSION_NUM >= 0x071000 41 /* The multi interface timer callback was introduced in 7.16.0 */ 42 #define NEED_CURL_TIMER_CALLBACK 43 #define HAVE_SOCKET_ACTION 44 #endif 45 46 #ifndef HAVE_SOCKET_ACTION 47 /* If curl_multi_socket_action isn't available, define it statically here in 48 * terms of curl_multi_socket. Note that ev_bitmask will be ignored, which is 49 * less efficient but still safe. */ 50 static CURLMcode __curl_multi_socket_action(CURLM *multi_handle, 51 curl_socket_t sockfd, 52 int ev_bitmask, 53 int *running_handles) 54 { 55 return curl_multi_socket(multi_handle, sockfd, running_handles); 56 } 57 #define curl_multi_socket_action __curl_multi_socket_action 58 #endif 59 60 #define PROTOCOLS (CURLPROTO_HTTP | CURLPROTO_HTTPS | \ 61 CURLPROTO_FTP | CURLPROTO_FTPS | \ 62 CURLPROTO_TFTP) 63 64 #define CURL_NUM_STATES 8 65 #define CURL_NUM_ACB 8 66 #define SECTOR_SIZE 512 67 #define READ_AHEAD_DEFAULT (256 * 1024) 68 #define CURL_TIMEOUT_DEFAULT 5 69 #define CURL_TIMEOUT_MAX 10000 70 71 #define FIND_RET_NONE 0 72 #define FIND_RET_OK 1 73 #define FIND_RET_WAIT 2 74 75 #define CURL_BLOCK_OPT_URL "url" 76 #define CURL_BLOCK_OPT_READAHEAD "readahead" 77 #define CURL_BLOCK_OPT_SSLVERIFY "sslverify" 78 #define CURL_BLOCK_OPT_TIMEOUT "timeout" 79 #define CURL_BLOCK_OPT_COOKIE "cookie" 80 81 struct BDRVCURLState; 82 83 typedef struct CURLAIOCB { 84 BlockAIOCB common; 85 QEMUBH *bh; 86 QEMUIOVector *qiov; 87 88 int64_t sector_num; 89 int nb_sectors; 90 91 size_t start; 92 size_t end; 93 } CURLAIOCB; 94 95 typedef struct CURLState 96 { 97 struct BDRVCURLState *s; 98 CURLAIOCB *acb[CURL_NUM_ACB]; 99 CURL *curl; 100 curl_socket_t sock_fd; 101 char *orig_buf; 102 size_t buf_start; 103 size_t buf_off; 104 size_t buf_len; 105 char range[128]; 106 char errmsg[CURL_ERROR_SIZE]; 107 char in_use; 108 } CURLState; 109 110 typedef struct BDRVCURLState { 111 CURLM *multi; 112 QEMUTimer timer; 113 size_t len; 114 CURLState states[CURL_NUM_STATES]; 115 char *url; 116 size_t readahead_size; 117 bool sslverify; 118 uint64_t timeout; 119 char *cookie; 120 bool accept_range; 121 AioContext *aio_context; 122 } BDRVCURLState; 123 124 static void curl_clean_state(CURLState *s); 125 static void curl_multi_do(void *arg); 126 static void curl_multi_read(void *arg); 127 128 #ifdef NEED_CURL_TIMER_CALLBACK 129 static int curl_timer_cb(CURLM *multi, long timeout_ms, void *opaque) 130 { 131 BDRVCURLState *s = opaque; 132 133 DPRINTF("CURL: timer callback timeout_ms %ld\n", timeout_ms); 134 if (timeout_ms == -1) { 135 timer_del(&s->timer); 136 } else { 137 int64_t timeout_ns = (int64_t)timeout_ms * 1000 * 1000; 138 timer_mod(&s->timer, 139 qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + timeout_ns); 140 } 141 return 0; 142 } 143 #endif 144 145 static int curl_sock_cb(CURL *curl, curl_socket_t fd, int action, 146 void *userp, void *sp) 147 { 148 BDRVCURLState *s; 149 CURLState *state = NULL; 150 curl_easy_getinfo(curl, CURLINFO_PRIVATE, (char **)&state); 151 state->sock_fd = fd; 152 s = state->s; 153 154 DPRINTF("CURL (AIO): Sock action %d on fd %d\n", action, fd); 155 switch (action) { 156 case CURL_POLL_IN: 157 aio_set_fd_handler(s->aio_context, fd, curl_multi_read, 158 NULL, state); 159 break; 160 case CURL_POLL_OUT: 161 aio_set_fd_handler(s->aio_context, fd, NULL, curl_multi_do, state); 162 break; 163 case CURL_POLL_INOUT: 164 aio_set_fd_handler(s->aio_context, fd, curl_multi_read, 165 curl_multi_do, state); 166 break; 167 case CURL_POLL_REMOVE: 168 aio_set_fd_handler(s->aio_context, fd, NULL, NULL, NULL); 169 break; 170 } 171 172 return 0; 173 } 174 175 static size_t curl_header_cb(void *ptr, size_t size, size_t nmemb, void *opaque) 176 { 177 BDRVCURLState *s = opaque; 178 size_t realsize = size * nmemb; 179 const char *accept_line = "Accept-Ranges: bytes"; 180 181 if (realsize >= strlen(accept_line) 182 && strncmp((char *)ptr, accept_line, strlen(accept_line)) == 0) { 183 s->accept_range = true; 184 } 185 186 return realsize; 187 } 188 189 static size_t curl_read_cb(void *ptr, size_t size, size_t nmemb, void *opaque) 190 { 191 CURLState *s = ((CURLState*)opaque); 192 size_t realsize = size * nmemb; 193 int i; 194 195 DPRINTF("CURL: Just reading %zd bytes\n", realsize); 196 197 if (!s || !s->orig_buf) 198 return 0; 199 200 if (s->buf_off >= s->buf_len) { 201 /* buffer full, read nothing */ 202 return 0; 203 } 204 realsize = MIN(realsize, s->buf_len - s->buf_off); 205 memcpy(s->orig_buf + s->buf_off, ptr, realsize); 206 s->buf_off += realsize; 207 208 for(i=0; i<CURL_NUM_ACB; i++) { 209 CURLAIOCB *acb = s->acb[i]; 210 211 if (!acb) 212 continue; 213 214 if ((s->buf_off >= acb->end)) { 215 qemu_iovec_from_buf(acb->qiov, 0, s->orig_buf + acb->start, 216 acb->end - acb->start); 217 acb->common.cb(acb->common.opaque, 0); 218 qemu_aio_unref(acb); 219 s->acb[i] = NULL; 220 } 221 } 222 223 return realsize; 224 } 225 226 static int curl_find_buf(BDRVCURLState *s, size_t start, size_t len, 227 CURLAIOCB *acb) 228 { 229 int i; 230 size_t end = start + len; 231 232 for (i=0; i<CURL_NUM_STATES; i++) { 233 CURLState *state = &s->states[i]; 234 size_t buf_end = (state->buf_start + state->buf_off); 235 size_t buf_fend = (state->buf_start + state->buf_len); 236 237 if (!state->orig_buf) 238 continue; 239 if (!state->buf_off) 240 continue; 241 242 // Does the existing buffer cover our section? 243 if ((start >= state->buf_start) && 244 (start <= buf_end) && 245 (end >= state->buf_start) && 246 (end <= buf_end)) 247 { 248 char *buf = state->orig_buf + (start - state->buf_start); 249 250 qemu_iovec_from_buf(acb->qiov, 0, buf, len); 251 acb->common.cb(acb->common.opaque, 0); 252 253 return FIND_RET_OK; 254 } 255 256 // Wait for unfinished chunks 257 if (state->in_use && 258 (start >= state->buf_start) && 259 (start <= buf_fend) && 260 (end >= state->buf_start) && 261 (end <= buf_fend)) 262 { 263 int j; 264 265 acb->start = start - state->buf_start; 266 acb->end = acb->start + len; 267 268 for (j=0; j<CURL_NUM_ACB; j++) { 269 if (!state->acb[j]) { 270 state->acb[j] = acb; 271 return FIND_RET_WAIT; 272 } 273 } 274 } 275 } 276 277 return FIND_RET_NONE; 278 } 279 280 static void curl_multi_check_completion(BDRVCURLState *s) 281 { 282 int msgs_in_queue; 283 284 /* Try to find done transfers, so we can free the easy 285 * handle again. */ 286 for (;;) { 287 CURLMsg *msg; 288 msg = curl_multi_info_read(s->multi, &msgs_in_queue); 289 290 /* Quit when there are no more completions */ 291 if (!msg) 292 break; 293 294 if (msg->msg == CURLMSG_DONE) { 295 CURLState *state = NULL; 296 curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE, 297 (char **)&state); 298 299 /* ACBs for successful messages get completed in curl_read_cb */ 300 if (msg->data.result != CURLE_OK) { 301 int i; 302 static int errcount = 100; 303 304 /* Don't lose the original error message from curl, since 305 * it contains extra data. 306 */ 307 if (errcount > 0) { 308 error_report("curl: %s", state->errmsg); 309 if (--errcount == 0) { 310 error_report("curl: further errors suppressed"); 311 } 312 } 313 314 for (i = 0; i < CURL_NUM_ACB; i++) { 315 CURLAIOCB *acb = state->acb[i]; 316 317 if (acb == NULL) { 318 continue; 319 } 320 321 acb->common.cb(acb->common.opaque, -EPROTO); 322 qemu_aio_unref(acb); 323 state->acb[i] = NULL; 324 } 325 } 326 327 curl_clean_state(state); 328 break; 329 } 330 } 331 } 332 333 static void curl_multi_do(void *arg) 334 { 335 CURLState *s = (CURLState *)arg; 336 int running; 337 int r; 338 339 if (!s->s->multi) { 340 return; 341 } 342 343 do { 344 r = curl_multi_socket_action(s->s->multi, s->sock_fd, 0, &running); 345 } while(r == CURLM_CALL_MULTI_PERFORM); 346 347 } 348 349 static void curl_multi_read(void *arg) 350 { 351 CURLState *s = (CURLState *)arg; 352 353 curl_multi_do(arg); 354 curl_multi_check_completion(s->s); 355 } 356 357 static void curl_multi_timeout_do(void *arg) 358 { 359 #ifdef NEED_CURL_TIMER_CALLBACK 360 BDRVCURLState *s = (BDRVCURLState *)arg; 361 int running; 362 363 if (!s->multi) { 364 return; 365 } 366 367 curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running); 368 369 curl_multi_check_completion(s); 370 #else 371 abort(); 372 #endif 373 } 374 375 static CURLState *curl_init_state(BlockDriverState *bs, BDRVCURLState *s) 376 { 377 CURLState *state = NULL; 378 int i, j; 379 380 do { 381 for (i=0; i<CURL_NUM_STATES; i++) { 382 for (j=0; j<CURL_NUM_ACB; j++) 383 if (s->states[i].acb[j]) 384 continue; 385 if (s->states[i].in_use) 386 continue; 387 388 state = &s->states[i]; 389 state->in_use = 1; 390 break; 391 } 392 if (!state) { 393 aio_poll(bdrv_get_aio_context(bs), true); 394 } 395 } while(!state); 396 397 if (!state->curl) { 398 state->curl = curl_easy_init(); 399 if (!state->curl) { 400 return NULL; 401 } 402 curl_easy_setopt(state->curl, CURLOPT_URL, s->url); 403 curl_easy_setopt(state->curl, CURLOPT_SSL_VERIFYPEER, 404 (long) s->sslverify); 405 if (s->cookie) { 406 curl_easy_setopt(state->curl, CURLOPT_COOKIE, s->cookie); 407 } 408 curl_easy_setopt(state->curl, CURLOPT_TIMEOUT, (long)s->timeout); 409 curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION, 410 (void *)curl_read_cb); 411 curl_easy_setopt(state->curl, CURLOPT_WRITEDATA, (void *)state); 412 curl_easy_setopt(state->curl, CURLOPT_PRIVATE, (void *)state); 413 curl_easy_setopt(state->curl, CURLOPT_AUTOREFERER, 1); 414 curl_easy_setopt(state->curl, CURLOPT_FOLLOWLOCATION, 1); 415 curl_easy_setopt(state->curl, CURLOPT_NOSIGNAL, 1); 416 curl_easy_setopt(state->curl, CURLOPT_ERRORBUFFER, state->errmsg); 417 curl_easy_setopt(state->curl, CURLOPT_FAILONERROR, 1); 418 419 /* Restrict supported protocols to avoid security issues in the more 420 * obscure protocols. For example, do not allow POP3/SMTP/IMAP see 421 * CVE-2013-0249. 422 * 423 * Restricting protocols is only supported from 7.19.4 upwards. 424 */ 425 #if LIBCURL_VERSION_NUM >= 0x071304 426 curl_easy_setopt(state->curl, CURLOPT_PROTOCOLS, PROTOCOLS); 427 curl_easy_setopt(state->curl, CURLOPT_REDIR_PROTOCOLS, PROTOCOLS); 428 #endif 429 430 #ifdef DEBUG_VERBOSE 431 curl_easy_setopt(state->curl, CURLOPT_VERBOSE, 1); 432 #endif 433 } 434 435 state->s = s; 436 437 return state; 438 } 439 440 static void curl_clean_state(CURLState *s) 441 { 442 if (s->s->multi) 443 curl_multi_remove_handle(s->s->multi, s->curl); 444 s->in_use = 0; 445 } 446 447 static void curl_parse_filename(const char *filename, QDict *options, 448 Error **errp) 449 { 450 qdict_put(options, CURL_BLOCK_OPT_URL, qstring_from_str(filename)); 451 } 452 453 static void curl_detach_aio_context(BlockDriverState *bs) 454 { 455 BDRVCURLState *s = bs->opaque; 456 int i; 457 458 for (i = 0; i < CURL_NUM_STATES; i++) { 459 if (s->states[i].in_use) { 460 curl_clean_state(&s->states[i]); 461 } 462 if (s->states[i].curl) { 463 curl_easy_cleanup(s->states[i].curl); 464 s->states[i].curl = NULL; 465 } 466 g_free(s->states[i].orig_buf); 467 s->states[i].orig_buf = NULL; 468 } 469 if (s->multi) { 470 curl_multi_cleanup(s->multi); 471 s->multi = NULL; 472 } 473 474 timer_del(&s->timer); 475 } 476 477 static void curl_attach_aio_context(BlockDriverState *bs, 478 AioContext *new_context) 479 { 480 BDRVCURLState *s = bs->opaque; 481 482 aio_timer_init(new_context, &s->timer, 483 QEMU_CLOCK_REALTIME, SCALE_NS, 484 curl_multi_timeout_do, s); 485 486 assert(!s->multi); 487 s->multi = curl_multi_init(); 488 s->aio_context = new_context; 489 curl_multi_setopt(s->multi, CURLMOPT_SOCKETFUNCTION, curl_sock_cb); 490 #ifdef NEED_CURL_TIMER_CALLBACK 491 curl_multi_setopt(s->multi, CURLMOPT_TIMERDATA, s); 492 curl_multi_setopt(s->multi, CURLMOPT_TIMERFUNCTION, curl_timer_cb); 493 #endif 494 } 495 496 static QemuOptsList runtime_opts = { 497 .name = "curl", 498 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 499 .desc = { 500 { 501 .name = CURL_BLOCK_OPT_URL, 502 .type = QEMU_OPT_STRING, 503 .help = "URL to open", 504 }, 505 { 506 .name = CURL_BLOCK_OPT_READAHEAD, 507 .type = QEMU_OPT_SIZE, 508 .help = "Readahead size", 509 }, 510 { 511 .name = CURL_BLOCK_OPT_SSLVERIFY, 512 .type = QEMU_OPT_BOOL, 513 .help = "Verify SSL certificate" 514 }, 515 { 516 .name = CURL_BLOCK_OPT_TIMEOUT, 517 .type = QEMU_OPT_NUMBER, 518 .help = "Curl timeout" 519 }, 520 { 521 .name = CURL_BLOCK_OPT_COOKIE, 522 .type = QEMU_OPT_STRING, 523 .help = "Pass the cookie or list of cookies with each request" 524 }, 525 { /* end of list */ } 526 }, 527 }; 528 529 static int curl_open(BlockDriverState *bs, QDict *options, int flags, 530 Error **errp) 531 { 532 BDRVCURLState *s = bs->opaque; 533 CURLState *state = NULL; 534 QemuOpts *opts; 535 Error *local_err = NULL; 536 const char *file; 537 const char *cookie; 538 double d; 539 540 static int inited = 0; 541 542 if (flags & BDRV_O_RDWR) { 543 error_setg(errp, "curl block device does not support writes"); 544 return -EROFS; 545 } 546 547 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 548 qemu_opts_absorb_qdict(opts, options, &local_err); 549 if (local_err) { 550 error_propagate(errp, local_err); 551 goto out_noclean; 552 } 553 554 s->readahead_size = qemu_opt_get_size(opts, CURL_BLOCK_OPT_READAHEAD, 555 READ_AHEAD_DEFAULT); 556 if ((s->readahead_size & 0x1ff) != 0) { 557 error_setg(errp, "HTTP_READAHEAD_SIZE %zd is not a multiple of 512", 558 s->readahead_size); 559 goto out_noclean; 560 } 561 562 s->timeout = qemu_opt_get_number(opts, CURL_BLOCK_OPT_TIMEOUT, 563 CURL_TIMEOUT_DEFAULT); 564 if (s->timeout > CURL_TIMEOUT_MAX) { 565 error_setg(errp, "timeout parameter is too large or negative"); 566 goto out_noclean; 567 } 568 569 s->sslverify = qemu_opt_get_bool(opts, CURL_BLOCK_OPT_SSLVERIFY, true); 570 571 cookie = qemu_opt_get(opts, CURL_BLOCK_OPT_COOKIE); 572 s->cookie = g_strdup(cookie); 573 574 file = qemu_opt_get(opts, CURL_BLOCK_OPT_URL); 575 if (file == NULL) { 576 error_setg(errp, "curl block driver requires an 'url' option"); 577 goto out_noclean; 578 } 579 580 if (!inited) { 581 curl_global_init(CURL_GLOBAL_ALL); 582 inited = 1; 583 } 584 585 DPRINTF("CURL: Opening %s\n", file); 586 s->aio_context = bdrv_get_aio_context(bs); 587 s->url = g_strdup(file); 588 state = curl_init_state(bs, s); 589 if (!state) 590 goto out_noclean; 591 592 // Get file size 593 594 s->accept_range = false; 595 curl_easy_setopt(state->curl, CURLOPT_NOBODY, 1); 596 curl_easy_setopt(state->curl, CURLOPT_HEADERFUNCTION, 597 curl_header_cb); 598 curl_easy_setopt(state->curl, CURLOPT_HEADERDATA, s); 599 if (curl_easy_perform(state->curl)) 600 goto out; 601 curl_easy_getinfo(state->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &d); 602 if (d) 603 s->len = (size_t)d; 604 else if(!s->len) 605 goto out; 606 if ((!strncasecmp(s->url, "http://", strlen("http://")) 607 || !strncasecmp(s->url, "https://", strlen("https://"))) 608 && !s->accept_range) { 609 pstrcpy(state->errmsg, CURL_ERROR_SIZE, 610 "Server does not support 'range' (byte ranges)."); 611 goto out; 612 } 613 DPRINTF("CURL: Size = %zd\n", s->len); 614 615 curl_clean_state(state); 616 curl_easy_cleanup(state->curl); 617 state->curl = NULL; 618 619 curl_attach_aio_context(bs, bdrv_get_aio_context(bs)); 620 621 qemu_opts_del(opts); 622 return 0; 623 624 out: 625 error_setg(errp, "CURL: Error opening file: %s", state->errmsg); 626 curl_easy_cleanup(state->curl); 627 state->curl = NULL; 628 out_noclean: 629 g_free(s->cookie); 630 g_free(s->url); 631 qemu_opts_del(opts); 632 return -EINVAL; 633 } 634 635 static const AIOCBInfo curl_aiocb_info = { 636 .aiocb_size = sizeof(CURLAIOCB), 637 }; 638 639 640 static void curl_readv_bh_cb(void *p) 641 { 642 CURLState *state; 643 int running; 644 645 CURLAIOCB *acb = p; 646 BDRVCURLState *s = acb->common.bs->opaque; 647 648 qemu_bh_delete(acb->bh); 649 acb->bh = NULL; 650 651 size_t start = acb->sector_num * SECTOR_SIZE; 652 size_t end; 653 654 // In case we have the requested data already (e.g. read-ahead), 655 // we can just call the callback and be done. 656 switch (curl_find_buf(s, start, acb->nb_sectors * SECTOR_SIZE, acb)) { 657 case FIND_RET_OK: 658 qemu_aio_unref(acb); 659 // fall through 660 case FIND_RET_WAIT: 661 return; 662 default: 663 break; 664 } 665 666 // No cache found, so let's start a new request 667 state = curl_init_state(acb->common.bs, s); 668 if (!state) { 669 acb->common.cb(acb->common.opaque, -EIO); 670 qemu_aio_unref(acb); 671 return; 672 } 673 674 acb->start = 0; 675 acb->end = (acb->nb_sectors * SECTOR_SIZE); 676 677 state->buf_off = 0; 678 g_free(state->orig_buf); 679 state->buf_start = start; 680 state->buf_len = acb->end + s->readahead_size; 681 end = MIN(start + state->buf_len, s->len) - 1; 682 state->orig_buf = g_try_malloc(state->buf_len); 683 if (state->buf_len && state->orig_buf == NULL) { 684 curl_clean_state(state); 685 acb->common.cb(acb->common.opaque, -ENOMEM); 686 qemu_aio_unref(acb); 687 return; 688 } 689 state->acb[0] = acb; 690 691 snprintf(state->range, 127, "%zd-%zd", start, end); 692 DPRINTF("CURL (AIO): Reading %d at %zd (%s)\n", 693 (acb->nb_sectors * SECTOR_SIZE), start, state->range); 694 curl_easy_setopt(state->curl, CURLOPT_RANGE, state->range); 695 696 curl_multi_add_handle(s->multi, state->curl); 697 698 /* Tell curl it needs to kick things off */ 699 curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running); 700 } 701 702 static BlockAIOCB *curl_aio_readv(BlockDriverState *bs, 703 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, 704 BlockCompletionFunc *cb, void *opaque) 705 { 706 CURLAIOCB *acb; 707 708 acb = qemu_aio_get(&curl_aiocb_info, bs, cb, opaque); 709 710 acb->qiov = qiov; 711 acb->sector_num = sector_num; 712 acb->nb_sectors = nb_sectors; 713 714 acb->bh = aio_bh_new(bdrv_get_aio_context(bs), curl_readv_bh_cb, acb); 715 qemu_bh_schedule(acb->bh); 716 return &acb->common; 717 } 718 719 static void curl_close(BlockDriverState *bs) 720 { 721 BDRVCURLState *s = bs->opaque; 722 723 DPRINTF("CURL: Close\n"); 724 curl_detach_aio_context(bs); 725 726 g_free(s->cookie); 727 g_free(s->url); 728 } 729 730 static int64_t curl_getlength(BlockDriverState *bs) 731 { 732 BDRVCURLState *s = bs->opaque; 733 return s->len; 734 } 735 736 static BlockDriver bdrv_http = { 737 .format_name = "http", 738 .protocol_name = "http", 739 740 .instance_size = sizeof(BDRVCURLState), 741 .bdrv_parse_filename = curl_parse_filename, 742 .bdrv_file_open = curl_open, 743 .bdrv_close = curl_close, 744 .bdrv_getlength = curl_getlength, 745 746 .bdrv_aio_readv = curl_aio_readv, 747 748 .bdrv_detach_aio_context = curl_detach_aio_context, 749 .bdrv_attach_aio_context = curl_attach_aio_context, 750 }; 751 752 static BlockDriver bdrv_https = { 753 .format_name = "https", 754 .protocol_name = "https", 755 756 .instance_size = sizeof(BDRVCURLState), 757 .bdrv_parse_filename = curl_parse_filename, 758 .bdrv_file_open = curl_open, 759 .bdrv_close = curl_close, 760 .bdrv_getlength = curl_getlength, 761 762 .bdrv_aio_readv = curl_aio_readv, 763 764 .bdrv_detach_aio_context = curl_detach_aio_context, 765 .bdrv_attach_aio_context = curl_attach_aio_context, 766 }; 767 768 static BlockDriver bdrv_ftp = { 769 .format_name = "ftp", 770 .protocol_name = "ftp", 771 772 .instance_size = sizeof(BDRVCURLState), 773 .bdrv_parse_filename = curl_parse_filename, 774 .bdrv_file_open = curl_open, 775 .bdrv_close = curl_close, 776 .bdrv_getlength = curl_getlength, 777 778 .bdrv_aio_readv = curl_aio_readv, 779 780 .bdrv_detach_aio_context = curl_detach_aio_context, 781 .bdrv_attach_aio_context = curl_attach_aio_context, 782 }; 783 784 static BlockDriver bdrv_ftps = { 785 .format_name = "ftps", 786 .protocol_name = "ftps", 787 788 .instance_size = sizeof(BDRVCURLState), 789 .bdrv_parse_filename = curl_parse_filename, 790 .bdrv_file_open = curl_open, 791 .bdrv_close = curl_close, 792 .bdrv_getlength = curl_getlength, 793 794 .bdrv_aio_readv = curl_aio_readv, 795 796 .bdrv_detach_aio_context = curl_detach_aio_context, 797 .bdrv_attach_aio_context = curl_attach_aio_context, 798 }; 799 800 static BlockDriver bdrv_tftp = { 801 .format_name = "tftp", 802 .protocol_name = "tftp", 803 804 .instance_size = sizeof(BDRVCURLState), 805 .bdrv_parse_filename = curl_parse_filename, 806 .bdrv_file_open = curl_open, 807 .bdrv_close = curl_close, 808 .bdrv_getlength = curl_getlength, 809 810 .bdrv_aio_readv = curl_aio_readv, 811 812 .bdrv_detach_aio_context = curl_detach_aio_context, 813 .bdrv_attach_aio_context = curl_attach_aio_context, 814 }; 815 816 static void curl_block_init(void) 817 { 818 bdrv_register(&bdrv_http); 819 bdrv_register(&bdrv_https); 820 bdrv_register(&bdrv_ftp); 821 bdrv_register(&bdrv_ftps); 822 bdrv_register(&bdrv_tftp); 823 } 824 825 block_init(curl_block_init); 826