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, false, 158 curl_multi_read, NULL, state); 159 break; 160 case CURL_POLL_OUT: 161 aio_set_fd_handler(s->aio_context, fd, false, 162 NULL, curl_multi_do, state); 163 break; 164 case CURL_POLL_INOUT: 165 aio_set_fd_handler(s->aio_context, fd, false, 166 curl_multi_read, curl_multi_do, state); 167 break; 168 case CURL_POLL_REMOVE: 169 aio_set_fd_handler(s->aio_context, fd, false, 170 NULL, NULL, NULL); 171 break; 172 } 173 174 return 0; 175 } 176 177 static size_t curl_header_cb(void *ptr, size_t size, size_t nmemb, void *opaque) 178 { 179 BDRVCURLState *s = opaque; 180 size_t realsize = size * nmemb; 181 const char *accept_line = "Accept-Ranges: bytes"; 182 183 if (realsize >= strlen(accept_line) 184 && strncmp((char *)ptr, accept_line, strlen(accept_line)) == 0) { 185 s->accept_range = true; 186 } 187 188 return realsize; 189 } 190 191 static size_t curl_read_cb(void *ptr, size_t size, size_t nmemb, void *opaque) 192 { 193 CURLState *s = ((CURLState*)opaque); 194 size_t realsize = size * nmemb; 195 int i; 196 197 DPRINTF("CURL: Just reading %zd bytes\n", realsize); 198 199 if (!s || !s->orig_buf) 200 return 0; 201 202 if (s->buf_off >= s->buf_len) { 203 /* buffer full, read nothing */ 204 return 0; 205 } 206 realsize = MIN(realsize, s->buf_len - s->buf_off); 207 memcpy(s->orig_buf + s->buf_off, ptr, realsize); 208 s->buf_off += realsize; 209 210 for(i=0; i<CURL_NUM_ACB; i++) { 211 CURLAIOCB *acb = s->acb[i]; 212 213 if (!acb) 214 continue; 215 216 if ((s->buf_off >= acb->end)) { 217 qemu_iovec_from_buf(acb->qiov, 0, s->orig_buf + acb->start, 218 acb->end - acb->start); 219 acb->common.cb(acb->common.opaque, 0); 220 qemu_aio_unref(acb); 221 s->acb[i] = NULL; 222 } 223 } 224 225 return realsize; 226 } 227 228 static int curl_find_buf(BDRVCURLState *s, size_t start, size_t len, 229 CURLAIOCB *acb) 230 { 231 int i; 232 size_t end = start + len; 233 234 for (i=0; i<CURL_NUM_STATES; i++) { 235 CURLState *state = &s->states[i]; 236 size_t buf_end = (state->buf_start + state->buf_off); 237 size_t buf_fend = (state->buf_start + state->buf_len); 238 239 if (!state->orig_buf) 240 continue; 241 if (!state->buf_off) 242 continue; 243 244 // Does the existing buffer cover our section? 245 if ((start >= state->buf_start) && 246 (start <= buf_end) && 247 (end >= state->buf_start) && 248 (end <= buf_end)) 249 { 250 char *buf = state->orig_buf + (start - state->buf_start); 251 252 qemu_iovec_from_buf(acb->qiov, 0, buf, len); 253 acb->common.cb(acb->common.opaque, 0); 254 255 return FIND_RET_OK; 256 } 257 258 // Wait for unfinished chunks 259 if (state->in_use && 260 (start >= state->buf_start) && 261 (start <= buf_fend) && 262 (end >= state->buf_start) && 263 (end <= buf_fend)) 264 { 265 int j; 266 267 acb->start = start - state->buf_start; 268 acb->end = acb->start + len; 269 270 for (j=0; j<CURL_NUM_ACB; j++) { 271 if (!state->acb[j]) { 272 state->acb[j] = acb; 273 return FIND_RET_WAIT; 274 } 275 } 276 } 277 } 278 279 return FIND_RET_NONE; 280 } 281 282 static void curl_multi_check_completion(BDRVCURLState *s) 283 { 284 int msgs_in_queue; 285 286 /* Try to find done transfers, so we can free the easy 287 * handle again. */ 288 for (;;) { 289 CURLMsg *msg; 290 msg = curl_multi_info_read(s->multi, &msgs_in_queue); 291 292 /* Quit when there are no more completions */ 293 if (!msg) 294 break; 295 296 if (msg->msg == CURLMSG_DONE) { 297 CURLState *state = NULL; 298 curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE, 299 (char **)&state); 300 301 /* ACBs for successful messages get completed in curl_read_cb */ 302 if (msg->data.result != CURLE_OK) { 303 int i; 304 static int errcount = 100; 305 306 /* Don't lose the original error message from curl, since 307 * it contains extra data. 308 */ 309 if (errcount > 0) { 310 error_report("curl: %s", state->errmsg); 311 if (--errcount == 0) { 312 error_report("curl: further errors suppressed"); 313 } 314 } 315 316 for (i = 0; i < CURL_NUM_ACB; i++) { 317 CURLAIOCB *acb = state->acb[i]; 318 319 if (acb == NULL) { 320 continue; 321 } 322 323 acb->common.cb(acb->common.opaque, -EPROTO); 324 qemu_aio_unref(acb); 325 state->acb[i] = NULL; 326 } 327 } 328 329 curl_clean_state(state); 330 break; 331 } 332 } 333 } 334 335 static void curl_multi_do(void *arg) 336 { 337 CURLState *s = (CURLState *)arg; 338 int running; 339 int r; 340 341 if (!s->s->multi) { 342 return; 343 } 344 345 do { 346 r = curl_multi_socket_action(s->s->multi, s->sock_fd, 0, &running); 347 } while(r == CURLM_CALL_MULTI_PERFORM); 348 349 } 350 351 static void curl_multi_read(void *arg) 352 { 353 CURLState *s = (CURLState *)arg; 354 355 curl_multi_do(arg); 356 curl_multi_check_completion(s->s); 357 } 358 359 static void curl_multi_timeout_do(void *arg) 360 { 361 #ifdef NEED_CURL_TIMER_CALLBACK 362 BDRVCURLState *s = (BDRVCURLState *)arg; 363 int running; 364 365 if (!s->multi) { 366 return; 367 } 368 369 curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running); 370 371 curl_multi_check_completion(s); 372 #else 373 abort(); 374 #endif 375 } 376 377 static CURLState *curl_init_state(BlockDriverState *bs, BDRVCURLState *s) 378 { 379 CURLState *state = NULL; 380 int i, j; 381 382 do { 383 for (i=0; i<CURL_NUM_STATES; i++) { 384 for (j=0; j<CURL_NUM_ACB; j++) 385 if (s->states[i].acb[j]) 386 continue; 387 if (s->states[i].in_use) 388 continue; 389 390 state = &s->states[i]; 391 state->in_use = 1; 392 break; 393 } 394 if (!state) { 395 aio_poll(bdrv_get_aio_context(bs), true); 396 } 397 } while(!state); 398 399 if (!state->curl) { 400 state->curl = curl_easy_init(); 401 if (!state->curl) { 402 return NULL; 403 } 404 curl_easy_setopt(state->curl, CURLOPT_URL, s->url); 405 curl_easy_setopt(state->curl, CURLOPT_SSL_VERIFYPEER, 406 (long) s->sslverify); 407 if (s->cookie) { 408 curl_easy_setopt(state->curl, CURLOPT_COOKIE, s->cookie); 409 } 410 curl_easy_setopt(state->curl, CURLOPT_TIMEOUT, (long)s->timeout); 411 curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION, 412 (void *)curl_read_cb); 413 curl_easy_setopt(state->curl, CURLOPT_WRITEDATA, (void *)state); 414 curl_easy_setopt(state->curl, CURLOPT_PRIVATE, (void *)state); 415 curl_easy_setopt(state->curl, CURLOPT_AUTOREFERER, 1); 416 curl_easy_setopt(state->curl, CURLOPT_FOLLOWLOCATION, 1); 417 curl_easy_setopt(state->curl, CURLOPT_NOSIGNAL, 1); 418 curl_easy_setopt(state->curl, CURLOPT_ERRORBUFFER, state->errmsg); 419 curl_easy_setopt(state->curl, CURLOPT_FAILONERROR, 1); 420 421 /* Restrict supported protocols to avoid security issues in the more 422 * obscure protocols. For example, do not allow POP3/SMTP/IMAP see 423 * CVE-2013-0249. 424 * 425 * Restricting protocols is only supported from 7.19.4 upwards. 426 */ 427 #if LIBCURL_VERSION_NUM >= 0x071304 428 curl_easy_setopt(state->curl, CURLOPT_PROTOCOLS, PROTOCOLS); 429 curl_easy_setopt(state->curl, CURLOPT_REDIR_PROTOCOLS, PROTOCOLS); 430 #endif 431 432 #ifdef DEBUG_VERBOSE 433 curl_easy_setopt(state->curl, CURLOPT_VERBOSE, 1); 434 #endif 435 } 436 437 state->s = s; 438 439 return state; 440 } 441 442 static void curl_clean_state(CURLState *s) 443 { 444 if (s->s->multi) 445 curl_multi_remove_handle(s->s->multi, s->curl); 446 s->in_use = 0; 447 } 448 449 static void curl_parse_filename(const char *filename, QDict *options, 450 Error **errp) 451 { 452 qdict_put(options, CURL_BLOCK_OPT_URL, qstring_from_str(filename)); 453 } 454 455 static void curl_detach_aio_context(BlockDriverState *bs) 456 { 457 BDRVCURLState *s = bs->opaque; 458 int i; 459 460 for (i = 0; i < CURL_NUM_STATES; i++) { 461 if (s->states[i].in_use) { 462 curl_clean_state(&s->states[i]); 463 } 464 if (s->states[i].curl) { 465 curl_easy_cleanup(s->states[i].curl); 466 s->states[i].curl = NULL; 467 } 468 g_free(s->states[i].orig_buf); 469 s->states[i].orig_buf = NULL; 470 } 471 if (s->multi) { 472 curl_multi_cleanup(s->multi); 473 s->multi = NULL; 474 } 475 476 timer_del(&s->timer); 477 } 478 479 static void curl_attach_aio_context(BlockDriverState *bs, 480 AioContext *new_context) 481 { 482 BDRVCURLState *s = bs->opaque; 483 484 aio_timer_init(new_context, &s->timer, 485 QEMU_CLOCK_REALTIME, SCALE_NS, 486 curl_multi_timeout_do, s); 487 488 assert(!s->multi); 489 s->multi = curl_multi_init(); 490 s->aio_context = new_context; 491 curl_multi_setopt(s->multi, CURLMOPT_SOCKETFUNCTION, curl_sock_cb); 492 #ifdef NEED_CURL_TIMER_CALLBACK 493 curl_multi_setopt(s->multi, CURLMOPT_TIMERDATA, s); 494 curl_multi_setopt(s->multi, CURLMOPT_TIMERFUNCTION, curl_timer_cb); 495 #endif 496 } 497 498 static QemuOptsList runtime_opts = { 499 .name = "curl", 500 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 501 .desc = { 502 { 503 .name = CURL_BLOCK_OPT_URL, 504 .type = QEMU_OPT_STRING, 505 .help = "URL to open", 506 }, 507 { 508 .name = CURL_BLOCK_OPT_READAHEAD, 509 .type = QEMU_OPT_SIZE, 510 .help = "Readahead size", 511 }, 512 { 513 .name = CURL_BLOCK_OPT_SSLVERIFY, 514 .type = QEMU_OPT_BOOL, 515 .help = "Verify SSL certificate" 516 }, 517 { 518 .name = CURL_BLOCK_OPT_TIMEOUT, 519 .type = QEMU_OPT_NUMBER, 520 .help = "Curl timeout" 521 }, 522 { 523 .name = CURL_BLOCK_OPT_COOKIE, 524 .type = QEMU_OPT_STRING, 525 .help = "Pass the cookie or list of cookies with each request" 526 }, 527 { /* end of list */ } 528 }, 529 }; 530 531 static int curl_open(BlockDriverState *bs, QDict *options, int flags, 532 Error **errp) 533 { 534 BDRVCURLState *s = bs->opaque; 535 CURLState *state = NULL; 536 QemuOpts *opts; 537 Error *local_err = NULL; 538 const char *file; 539 const char *cookie; 540 double d; 541 542 static int inited = 0; 543 544 if (flags & BDRV_O_RDWR) { 545 error_setg(errp, "curl block device does not support writes"); 546 return -EROFS; 547 } 548 549 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 550 qemu_opts_absorb_qdict(opts, options, &local_err); 551 if (local_err) { 552 error_propagate(errp, local_err); 553 goto out_noclean; 554 } 555 556 s->readahead_size = qemu_opt_get_size(opts, CURL_BLOCK_OPT_READAHEAD, 557 READ_AHEAD_DEFAULT); 558 if ((s->readahead_size & 0x1ff) != 0) { 559 error_setg(errp, "HTTP_READAHEAD_SIZE %zd is not a multiple of 512", 560 s->readahead_size); 561 goto out_noclean; 562 } 563 564 s->timeout = qemu_opt_get_number(opts, CURL_BLOCK_OPT_TIMEOUT, 565 CURL_TIMEOUT_DEFAULT); 566 if (s->timeout > CURL_TIMEOUT_MAX) { 567 error_setg(errp, "timeout parameter is too large or negative"); 568 goto out_noclean; 569 } 570 571 s->sslverify = qemu_opt_get_bool(opts, CURL_BLOCK_OPT_SSLVERIFY, true); 572 573 cookie = qemu_opt_get(opts, CURL_BLOCK_OPT_COOKIE); 574 s->cookie = g_strdup(cookie); 575 576 file = qemu_opt_get(opts, CURL_BLOCK_OPT_URL); 577 if (file == NULL) { 578 error_setg(errp, "curl block driver requires an 'url' option"); 579 goto out_noclean; 580 } 581 582 if (!inited) { 583 curl_global_init(CURL_GLOBAL_ALL); 584 inited = 1; 585 } 586 587 DPRINTF("CURL: Opening %s\n", file); 588 s->aio_context = bdrv_get_aio_context(bs); 589 s->url = g_strdup(file); 590 state = curl_init_state(bs, s); 591 if (!state) 592 goto out_noclean; 593 594 // Get file size 595 596 s->accept_range = false; 597 curl_easy_setopt(state->curl, CURLOPT_NOBODY, 1); 598 curl_easy_setopt(state->curl, CURLOPT_HEADERFUNCTION, 599 curl_header_cb); 600 curl_easy_setopt(state->curl, CURLOPT_HEADERDATA, s); 601 if (curl_easy_perform(state->curl)) 602 goto out; 603 curl_easy_getinfo(state->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &d); 604 if (d) 605 s->len = (size_t)d; 606 else if(!s->len) 607 goto out; 608 if ((!strncasecmp(s->url, "http://", strlen("http://")) 609 || !strncasecmp(s->url, "https://", strlen("https://"))) 610 && !s->accept_range) { 611 pstrcpy(state->errmsg, CURL_ERROR_SIZE, 612 "Server does not support 'range' (byte ranges)."); 613 goto out; 614 } 615 DPRINTF("CURL: Size = %zd\n", s->len); 616 617 curl_clean_state(state); 618 curl_easy_cleanup(state->curl); 619 state->curl = NULL; 620 621 curl_attach_aio_context(bs, bdrv_get_aio_context(bs)); 622 623 qemu_opts_del(opts); 624 return 0; 625 626 out: 627 error_setg(errp, "CURL: Error opening file: %s", state->errmsg); 628 curl_easy_cleanup(state->curl); 629 state->curl = NULL; 630 out_noclean: 631 g_free(s->cookie); 632 g_free(s->url); 633 qemu_opts_del(opts); 634 return -EINVAL; 635 } 636 637 static const AIOCBInfo curl_aiocb_info = { 638 .aiocb_size = sizeof(CURLAIOCB), 639 }; 640 641 642 static void curl_readv_bh_cb(void *p) 643 { 644 CURLState *state; 645 int running; 646 647 CURLAIOCB *acb = p; 648 BDRVCURLState *s = acb->common.bs->opaque; 649 650 qemu_bh_delete(acb->bh); 651 acb->bh = NULL; 652 653 size_t start = acb->sector_num * SECTOR_SIZE; 654 size_t end; 655 656 // In case we have the requested data already (e.g. read-ahead), 657 // we can just call the callback and be done. 658 switch (curl_find_buf(s, start, acb->nb_sectors * SECTOR_SIZE, acb)) { 659 case FIND_RET_OK: 660 qemu_aio_unref(acb); 661 // fall through 662 case FIND_RET_WAIT: 663 return; 664 default: 665 break; 666 } 667 668 // No cache found, so let's start a new request 669 state = curl_init_state(acb->common.bs, s); 670 if (!state) { 671 acb->common.cb(acb->common.opaque, -EIO); 672 qemu_aio_unref(acb); 673 return; 674 } 675 676 acb->start = 0; 677 acb->end = (acb->nb_sectors * SECTOR_SIZE); 678 679 state->buf_off = 0; 680 g_free(state->orig_buf); 681 state->buf_start = start; 682 state->buf_len = acb->end + s->readahead_size; 683 end = MIN(start + state->buf_len, s->len) - 1; 684 state->orig_buf = g_try_malloc(state->buf_len); 685 if (state->buf_len && state->orig_buf == NULL) { 686 curl_clean_state(state); 687 acb->common.cb(acb->common.opaque, -ENOMEM); 688 qemu_aio_unref(acb); 689 return; 690 } 691 state->acb[0] = acb; 692 693 snprintf(state->range, 127, "%zd-%zd", start, end); 694 DPRINTF("CURL (AIO): Reading %d at %zd (%s)\n", 695 (acb->nb_sectors * SECTOR_SIZE), start, state->range); 696 curl_easy_setopt(state->curl, CURLOPT_RANGE, state->range); 697 698 curl_multi_add_handle(s->multi, state->curl); 699 700 /* Tell curl it needs to kick things off */ 701 curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running); 702 } 703 704 static BlockAIOCB *curl_aio_readv(BlockDriverState *bs, 705 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, 706 BlockCompletionFunc *cb, void *opaque) 707 { 708 CURLAIOCB *acb; 709 710 acb = qemu_aio_get(&curl_aiocb_info, bs, cb, opaque); 711 712 acb->qiov = qiov; 713 acb->sector_num = sector_num; 714 acb->nb_sectors = nb_sectors; 715 716 acb->bh = aio_bh_new(bdrv_get_aio_context(bs), curl_readv_bh_cb, acb); 717 qemu_bh_schedule(acb->bh); 718 return &acb->common; 719 } 720 721 static void curl_close(BlockDriverState *bs) 722 { 723 BDRVCURLState *s = bs->opaque; 724 725 DPRINTF("CURL: Close\n"); 726 curl_detach_aio_context(bs); 727 728 g_free(s->cookie); 729 g_free(s->url); 730 } 731 732 static int64_t curl_getlength(BlockDriverState *bs) 733 { 734 BDRVCURLState *s = bs->opaque; 735 return s->len; 736 } 737 738 static BlockDriver bdrv_http = { 739 .format_name = "http", 740 .protocol_name = "http", 741 742 .instance_size = sizeof(BDRVCURLState), 743 .bdrv_parse_filename = curl_parse_filename, 744 .bdrv_file_open = curl_open, 745 .bdrv_close = curl_close, 746 .bdrv_getlength = curl_getlength, 747 748 .bdrv_aio_readv = curl_aio_readv, 749 750 .bdrv_detach_aio_context = curl_detach_aio_context, 751 .bdrv_attach_aio_context = curl_attach_aio_context, 752 }; 753 754 static BlockDriver bdrv_https = { 755 .format_name = "https", 756 .protocol_name = "https", 757 758 .instance_size = sizeof(BDRVCURLState), 759 .bdrv_parse_filename = curl_parse_filename, 760 .bdrv_file_open = curl_open, 761 .bdrv_close = curl_close, 762 .bdrv_getlength = curl_getlength, 763 764 .bdrv_aio_readv = curl_aio_readv, 765 766 .bdrv_detach_aio_context = curl_detach_aio_context, 767 .bdrv_attach_aio_context = curl_attach_aio_context, 768 }; 769 770 static BlockDriver bdrv_ftp = { 771 .format_name = "ftp", 772 .protocol_name = "ftp", 773 774 .instance_size = sizeof(BDRVCURLState), 775 .bdrv_parse_filename = curl_parse_filename, 776 .bdrv_file_open = curl_open, 777 .bdrv_close = curl_close, 778 .bdrv_getlength = curl_getlength, 779 780 .bdrv_aio_readv = curl_aio_readv, 781 782 .bdrv_detach_aio_context = curl_detach_aio_context, 783 .bdrv_attach_aio_context = curl_attach_aio_context, 784 }; 785 786 static BlockDriver bdrv_ftps = { 787 .format_name = "ftps", 788 .protocol_name = "ftps", 789 790 .instance_size = sizeof(BDRVCURLState), 791 .bdrv_parse_filename = curl_parse_filename, 792 .bdrv_file_open = curl_open, 793 .bdrv_close = curl_close, 794 .bdrv_getlength = curl_getlength, 795 796 .bdrv_aio_readv = curl_aio_readv, 797 798 .bdrv_detach_aio_context = curl_detach_aio_context, 799 .bdrv_attach_aio_context = curl_attach_aio_context, 800 }; 801 802 static BlockDriver bdrv_tftp = { 803 .format_name = "tftp", 804 .protocol_name = "tftp", 805 806 .instance_size = sizeof(BDRVCURLState), 807 .bdrv_parse_filename = curl_parse_filename, 808 .bdrv_file_open = curl_open, 809 .bdrv_close = curl_close, 810 .bdrv_getlength = curl_getlength, 811 812 .bdrv_aio_readv = curl_aio_readv, 813 814 .bdrv_detach_aio_context = curl_detach_aio_context, 815 .bdrv_attach_aio_context = curl_attach_aio_context, 816 }; 817 818 static void curl_block_init(void) 819 { 820 bdrv_register(&bdrv_http); 821 bdrv_register(&bdrv_https); 822 bdrv_register(&bdrv_ftp); 823 bdrv_register(&bdrv_ftps); 824 bdrv_register(&bdrv_tftp); 825 } 826 827 block_init(curl_block_init); 828