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_CURL 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 #define CURL_BLOCK_OPT_COOKIE "cookie" 77 78 struct BDRVCURLState; 79 80 typedef struct CURLAIOCB { 81 BlockDriverAIOCB common; 82 QEMUBH *bh; 83 QEMUIOVector *qiov; 84 85 int64_t sector_num; 86 int nb_sectors; 87 88 size_t start; 89 size_t end; 90 } CURLAIOCB; 91 92 typedef struct CURLState 93 { 94 struct BDRVCURLState *s; 95 CURLAIOCB *acb[CURL_NUM_ACB]; 96 CURL *curl; 97 curl_socket_t sock_fd; 98 char *orig_buf; 99 size_t buf_start; 100 size_t buf_off; 101 size_t buf_len; 102 char range[128]; 103 char errmsg[CURL_ERROR_SIZE]; 104 char in_use; 105 } CURLState; 106 107 typedef struct BDRVCURLState { 108 CURLM *multi; 109 QEMUTimer timer; 110 size_t len; 111 CURLState states[CURL_NUM_STATES]; 112 char *url; 113 size_t readahead_size; 114 bool sslverify; 115 int timeout; 116 char *cookie; 117 bool accept_range; 118 AioContext *aio_context; 119 } BDRVCURLState; 120 121 static void curl_clean_state(CURLState *s); 122 static void curl_multi_do(void *arg); 123 static void curl_multi_read(void *arg); 124 125 #ifdef NEED_CURL_TIMER_CALLBACK 126 static int curl_timer_cb(CURLM *multi, long timeout_ms, void *opaque) 127 { 128 BDRVCURLState *s = opaque; 129 130 DPRINTF("CURL: timer callback timeout_ms %ld\n", timeout_ms); 131 if (timeout_ms == -1) { 132 timer_del(&s->timer); 133 } else { 134 int64_t timeout_ns = (int64_t)timeout_ms * 1000 * 1000; 135 timer_mod(&s->timer, 136 qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + timeout_ns); 137 } 138 return 0; 139 } 140 #endif 141 142 static int curl_sock_cb(CURL *curl, curl_socket_t fd, int action, 143 void *userp, void *sp) 144 { 145 BDRVCURLState *s; 146 CURLState *state = NULL; 147 curl_easy_getinfo(curl, CURLINFO_PRIVATE, (char **)&state); 148 state->sock_fd = fd; 149 s = state->s; 150 151 DPRINTF("CURL (AIO): Sock action %d on fd %d\n", action, fd); 152 switch (action) { 153 case CURL_POLL_IN: 154 aio_set_fd_handler(s->aio_context, fd, curl_multi_read, 155 NULL, state); 156 break; 157 case CURL_POLL_OUT: 158 aio_set_fd_handler(s->aio_context, fd, NULL, curl_multi_do, state); 159 break; 160 case CURL_POLL_INOUT: 161 aio_set_fd_handler(s->aio_context, fd, curl_multi_read, 162 curl_multi_do, state); 163 break; 164 case CURL_POLL_REMOVE: 165 aio_set_fd_handler(s->aio_context, fd, NULL, NULL, NULL); 166 break; 167 } 168 169 return 0; 170 } 171 172 static size_t curl_header_cb(void *ptr, size_t size, size_t nmemb, void *opaque) 173 { 174 BDRVCURLState *s = opaque; 175 size_t realsize = size * nmemb; 176 const char *accept_line = "Accept-Ranges: bytes"; 177 178 if (realsize >= strlen(accept_line) 179 && strncmp((char *)ptr, accept_line, strlen(accept_line)) == 0) { 180 s->accept_range = true; 181 } 182 183 return realsize; 184 } 185 186 static size_t curl_read_cb(void *ptr, size_t size, size_t nmemb, void *opaque) 187 { 188 CURLState *s = ((CURLState*)opaque); 189 size_t realsize = size * nmemb; 190 int i; 191 192 DPRINTF("CURL: Just reading %zd bytes\n", realsize); 193 194 if (!s || !s->orig_buf) 195 return 0; 196 197 if (s->buf_off >= s->buf_len) { 198 /* buffer full, read nothing */ 199 return 0; 200 } 201 realsize = MIN(realsize, s->buf_len - s->buf_off); 202 memcpy(s->orig_buf + s->buf_off, ptr, realsize); 203 s->buf_off += realsize; 204 205 for(i=0; i<CURL_NUM_ACB; i++) { 206 CURLAIOCB *acb = s->acb[i]; 207 208 if (!acb) 209 continue; 210 211 if ((s->buf_off >= acb->end)) { 212 qemu_iovec_from_buf(acb->qiov, 0, s->orig_buf + acb->start, 213 acb->end - acb->start); 214 acb->common.cb(acb->common.opaque, 0); 215 qemu_aio_release(acb); 216 s->acb[i] = NULL; 217 } 218 } 219 220 return realsize; 221 } 222 223 static int curl_find_buf(BDRVCURLState *s, size_t start, size_t len, 224 CURLAIOCB *acb) 225 { 226 int i; 227 size_t end = start + len; 228 229 for (i=0; i<CURL_NUM_STATES; i++) { 230 CURLState *state = &s->states[i]; 231 size_t buf_end = (state->buf_start + state->buf_off); 232 size_t buf_fend = (state->buf_start + state->buf_len); 233 234 if (!state->orig_buf) 235 continue; 236 if (!state->buf_off) 237 continue; 238 239 // Does the existing buffer cover our section? 240 if ((start >= state->buf_start) && 241 (start <= buf_end) && 242 (end >= state->buf_start) && 243 (end <= buf_end)) 244 { 245 char *buf = state->orig_buf + (start - state->buf_start); 246 247 qemu_iovec_from_buf(acb->qiov, 0, buf, len); 248 acb->common.cb(acb->common.opaque, 0); 249 250 return FIND_RET_OK; 251 } 252 253 // Wait for unfinished chunks 254 if (state->in_use && 255 (start >= state->buf_start) && 256 (start <= buf_fend) && 257 (end >= state->buf_start) && 258 (end <= buf_fend)) 259 { 260 int j; 261 262 acb->start = start - state->buf_start; 263 acb->end = acb->start + len; 264 265 for (j=0; j<CURL_NUM_ACB; j++) { 266 if (!state->acb[j]) { 267 state->acb[j] = acb; 268 return FIND_RET_WAIT; 269 } 270 } 271 } 272 } 273 274 return FIND_RET_NONE; 275 } 276 277 static void curl_multi_check_completion(BDRVCURLState *s) 278 { 279 int msgs_in_queue; 280 281 /* Try to find done transfers, so we can free the easy 282 * handle again. */ 283 for (;;) { 284 CURLMsg *msg; 285 msg = curl_multi_info_read(s->multi, &msgs_in_queue); 286 287 /* Quit when there are no more completions */ 288 if (!msg) 289 break; 290 291 if (msg->msg == CURLMSG_DONE) { 292 CURLState *state = NULL; 293 curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE, 294 (char **)&state); 295 296 /* ACBs for successful messages get completed in curl_read_cb */ 297 if (msg->data.result != CURLE_OK) { 298 int i; 299 for (i = 0; i < CURL_NUM_ACB; i++) { 300 CURLAIOCB *acb = state->acb[i]; 301 302 if (acb == NULL) { 303 continue; 304 } 305 306 acb->common.cb(acb->common.opaque, -EIO); 307 qemu_aio_release(acb); 308 state->acb[i] = NULL; 309 } 310 } 311 312 curl_clean_state(state); 313 break; 314 } 315 } 316 } 317 318 static void curl_multi_do(void *arg) 319 { 320 CURLState *s = (CURLState *)arg; 321 int running; 322 int r; 323 324 if (!s->s->multi) { 325 return; 326 } 327 328 do { 329 r = curl_multi_socket_action(s->s->multi, s->sock_fd, 0, &running); 330 } while(r == CURLM_CALL_MULTI_PERFORM); 331 332 } 333 334 static void curl_multi_read(void *arg) 335 { 336 CURLState *s = (CURLState *)arg; 337 338 curl_multi_do(arg); 339 curl_multi_check_completion(s->s); 340 } 341 342 static void curl_multi_timeout_do(void *arg) 343 { 344 #ifdef NEED_CURL_TIMER_CALLBACK 345 BDRVCURLState *s = (BDRVCURLState *)arg; 346 int running; 347 348 if (!s->multi) { 349 return; 350 } 351 352 curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running); 353 354 curl_multi_check_completion(s); 355 #else 356 abort(); 357 #endif 358 } 359 360 static CURLState *curl_init_state(BlockDriverState *bs, BDRVCURLState *s) 361 { 362 CURLState *state = NULL; 363 int i, j; 364 365 do { 366 for (i=0; i<CURL_NUM_STATES; i++) { 367 for (j=0; j<CURL_NUM_ACB; j++) 368 if (s->states[i].acb[j]) 369 continue; 370 if (s->states[i].in_use) 371 continue; 372 373 state = &s->states[i]; 374 state->in_use = 1; 375 break; 376 } 377 if (!state) { 378 aio_poll(bdrv_get_aio_context(bs), true); 379 } 380 } while(!state); 381 382 if (!state->curl) { 383 state->curl = curl_easy_init(); 384 if (!state->curl) { 385 return NULL; 386 } 387 curl_easy_setopt(state->curl, CURLOPT_URL, s->url); 388 curl_easy_setopt(state->curl, CURLOPT_SSL_VERIFYPEER, 389 (long) s->sslverify); 390 if (s->cookie) { 391 curl_easy_setopt(state->curl, CURLOPT_COOKIE, s->cookie); 392 } 393 curl_easy_setopt(state->curl, CURLOPT_TIMEOUT, s->timeout); 394 curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION, 395 (void *)curl_read_cb); 396 curl_easy_setopt(state->curl, CURLOPT_WRITEDATA, (void *)state); 397 curl_easy_setopt(state->curl, CURLOPT_PRIVATE, (void *)state); 398 curl_easy_setopt(state->curl, CURLOPT_AUTOREFERER, 1); 399 curl_easy_setopt(state->curl, CURLOPT_FOLLOWLOCATION, 1); 400 curl_easy_setopt(state->curl, CURLOPT_NOSIGNAL, 1); 401 curl_easy_setopt(state->curl, CURLOPT_ERRORBUFFER, state->errmsg); 402 curl_easy_setopt(state->curl, CURLOPT_FAILONERROR, 1); 403 404 /* Restrict supported protocols to avoid security issues in the more 405 * obscure protocols. For example, do not allow POP3/SMTP/IMAP see 406 * CVE-2013-0249. 407 * 408 * Restricting protocols is only supported from 7.19.4 upwards. 409 */ 410 #if LIBCURL_VERSION_NUM >= 0x071304 411 curl_easy_setopt(state->curl, CURLOPT_PROTOCOLS, PROTOCOLS); 412 curl_easy_setopt(state->curl, CURLOPT_REDIR_PROTOCOLS, PROTOCOLS); 413 #endif 414 415 #ifdef DEBUG_VERBOSE 416 curl_easy_setopt(state->curl, CURLOPT_VERBOSE, 1); 417 #endif 418 } 419 420 state->s = s; 421 422 return state; 423 } 424 425 static void curl_clean_state(CURLState *s) 426 { 427 if (s->s->multi) 428 curl_multi_remove_handle(s->s->multi, s->curl); 429 s->in_use = 0; 430 } 431 432 static void curl_parse_filename(const char *filename, QDict *options, 433 Error **errp) 434 { 435 qdict_put(options, CURL_BLOCK_OPT_URL, qstring_from_str(filename)); 436 } 437 438 static void curl_detach_aio_context(BlockDriverState *bs) 439 { 440 BDRVCURLState *s = bs->opaque; 441 int i; 442 443 for (i = 0; i < CURL_NUM_STATES; i++) { 444 if (s->states[i].in_use) { 445 curl_clean_state(&s->states[i]); 446 } 447 if (s->states[i].curl) { 448 curl_easy_cleanup(s->states[i].curl); 449 s->states[i].curl = NULL; 450 } 451 g_free(s->states[i].orig_buf); 452 s->states[i].orig_buf = NULL; 453 } 454 if (s->multi) { 455 curl_multi_cleanup(s->multi); 456 s->multi = NULL; 457 } 458 459 timer_del(&s->timer); 460 } 461 462 static void curl_attach_aio_context(BlockDriverState *bs, 463 AioContext *new_context) 464 { 465 BDRVCURLState *s = bs->opaque; 466 467 aio_timer_init(new_context, &s->timer, 468 QEMU_CLOCK_REALTIME, SCALE_NS, 469 curl_multi_timeout_do, s); 470 471 assert(!s->multi); 472 s->multi = curl_multi_init(); 473 s->aio_context = new_context; 474 curl_multi_setopt(s->multi, CURLMOPT_SOCKETFUNCTION, curl_sock_cb); 475 #ifdef NEED_CURL_TIMER_CALLBACK 476 curl_multi_setopt(s->multi, CURLMOPT_TIMERDATA, s); 477 curl_multi_setopt(s->multi, CURLMOPT_TIMERFUNCTION, curl_timer_cb); 478 #endif 479 } 480 481 static QemuOptsList runtime_opts = { 482 .name = "curl", 483 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 484 .desc = { 485 { 486 .name = CURL_BLOCK_OPT_URL, 487 .type = QEMU_OPT_STRING, 488 .help = "URL to open", 489 }, 490 { 491 .name = CURL_BLOCK_OPT_READAHEAD, 492 .type = QEMU_OPT_SIZE, 493 .help = "Readahead size", 494 }, 495 { 496 .name = CURL_BLOCK_OPT_SSLVERIFY, 497 .type = QEMU_OPT_BOOL, 498 .help = "Verify SSL certificate" 499 }, 500 { 501 .name = CURL_BLOCK_OPT_TIMEOUT, 502 .type = QEMU_OPT_NUMBER, 503 .help = "Curl timeout" 504 }, 505 { 506 .name = CURL_BLOCK_OPT_COOKIE, 507 .type = QEMU_OPT_STRING, 508 .help = "Pass the cookie or list of cookies with each request" 509 }, 510 { /* end of list */ } 511 }, 512 }; 513 514 static int curl_open(BlockDriverState *bs, QDict *options, int flags, 515 Error **errp) 516 { 517 BDRVCURLState *s = bs->opaque; 518 CURLState *state = NULL; 519 QemuOpts *opts; 520 Error *local_err = NULL; 521 const char *file; 522 const char *cookie; 523 double d; 524 525 static int inited = 0; 526 527 if (flags & BDRV_O_RDWR) { 528 error_setg(errp, "curl block device does not support writes"); 529 return -EROFS; 530 } 531 532 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 533 qemu_opts_absorb_qdict(opts, options, &local_err); 534 if (local_err) { 535 error_propagate(errp, local_err); 536 goto out_noclean; 537 } 538 539 s->readahead_size = qemu_opt_get_size(opts, CURL_BLOCK_OPT_READAHEAD, 540 READ_AHEAD_DEFAULT); 541 if ((s->readahead_size & 0x1ff) != 0) { 542 error_setg(errp, "HTTP_READAHEAD_SIZE %zd is not a multiple of 512", 543 s->readahead_size); 544 goto out_noclean; 545 } 546 547 s->timeout = qemu_opt_get_number(opts, CURL_BLOCK_OPT_TIMEOUT, 548 CURL_TIMEOUT_DEFAULT); 549 550 s->sslverify = qemu_opt_get_bool(opts, CURL_BLOCK_OPT_SSLVERIFY, true); 551 552 cookie = qemu_opt_get(opts, CURL_BLOCK_OPT_COOKIE); 553 s->cookie = g_strdup(cookie); 554 555 file = qemu_opt_get(opts, CURL_BLOCK_OPT_URL); 556 if (file == NULL) { 557 error_setg(errp, "curl block driver requires an 'url' option"); 558 goto out_noclean; 559 } 560 561 if (!inited) { 562 curl_global_init(CURL_GLOBAL_ALL); 563 inited = 1; 564 } 565 566 DPRINTF("CURL: Opening %s\n", file); 567 s->aio_context = bdrv_get_aio_context(bs); 568 s->url = g_strdup(file); 569 state = curl_init_state(bs, s); 570 if (!state) 571 goto out_noclean; 572 573 // Get file size 574 575 s->accept_range = false; 576 curl_easy_setopt(state->curl, CURLOPT_NOBODY, 1); 577 curl_easy_setopt(state->curl, CURLOPT_HEADERFUNCTION, 578 curl_header_cb); 579 curl_easy_setopt(state->curl, CURLOPT_HEADERDATA, s); 580 if (curl_easy_perform(state->curl)) 581 goto out; 582 curl_easy_getinfo(state->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &d); 583 if (d) 584 s->len = (size_t)d; 585 else if(!s->len) 586 goto out; 587 if ((!strncasecmp(s->url, "http://", strlen("http://")) 588 || !strncasecmp(s->url, "https://", strlen("https://"))) 589 && !s->accept_range) { 590 pstrcpy(state->errmsg, CURL_ERROR_SIZE, 591 "Server does not support 'range' (byte ranges)."); 592 goto out; 593 } 594 DPRINTF("CURL: Size = %zd\n", s->len); 595 596 curl_clean_state(state); 597 curl_easy_cleanup(state->curl); 598 state->curl = NULL; 599 600 curl_attach_aio_context(bs, bdrv_get_aio_context(bs)); 601 602 qemu_opts_del(opts); 603 return 0; 604 605 out: 606 error_setg(errp, "CURL: Error opening file: %s", state->errmsg); 607 curl_easy_cleanup(state->curl); 608 state->curl = NULL; 609 out_noclean: 610 g_free(s->cookie); 611 g_free(s->url); 612 qemu_opts_del(opts); 613 return -EINVAL; 614 } 615 616 static void curl_aio_cancel(BlockDriverAIOCB *blockacb) 617 { 618 // Do we have to implement canceling? Seems to work without... 619 } 620 621 static const AIOCBInfo curl_aiocb_info = { 622 .aiocb_size = sizeof(CURLAIOCB), 623 .cancel = curl_aio_cancel, 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_release(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_release(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_release(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 BlockDriverAIOCB *curl_aio_readv(BlockDriverState *bs, 690 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, 691 BlockDriverCompletionFunc *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); 813