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 25 #include "qemu/osdep.h" 26 #include "qapi/error.h" 27 #include "qemu/error-report.h" 28 #include "qemu/module.h" 29 #include "qemu/option.h" 30 #include "block/block_int.h" 31 #include "qapi/qmp/qdict.h" 32 #include "qapi/qmp/qstring.h" 33 #include "crypto/secret.h" 34 #include <curl/curl.h> 35 #include "qemu/cutils.h" 36 #include "trace.h" 37 38 // #define DEBUG_VERBOSE 39 40 #define PROTOCOLS (CURLPROTO_HTTP | CURLPROTO_HTTPS | \ 41 CURLPROTO_FTP | CURLPROTO_FTPS) 42 43 #define CURL_NUM_STATES 8 44 #define CURL_NUM_ACB 8 45 #define CURL_TIMEOUT_MAX 10000 46 47 #define CURL_BLOCK_OPT_URL "url" 48 #define CURL_BLOCK_OPT_READAHEAD "readahead" 49 #define CURL_BLOCK_OPT_SSLVERIFY "sslverify" 50 #define CURL_BLOCK_OPT_TIMEOUT "timeout" 51 #define CURL_BLOCK_OPT_COOKIE "cookie" 52 #define CURL_BLOCK_OPT_COOKIE_SECRET "cookie-secret" 53 #define CURL_BLOCK_OPT_USERNAME "username" 54 #define CURL_BLOCK_OPT_PASSWORD_SECRET "password-secret" 55 #define CURL_BLOCK_OPT_PROXY_USERNAME "proxy-username" 56 #define CURL_BLOCK_OPT_PROXY_PASSWORD_SECRET "proxy-password-secret" 57 58 #define CURL_BLOCK_OPT_READAHEAD_DEFAULT (256 * 1024) 59 #define CURL_BLOCK_OPT_SSLVERIFY_DEFAULT true 60 #define CURL_BLOCK_OPT_TIMEOUT_DEFAULT 5 61 62 struct BDRVCURLState; 63 struct CURLState; 64 65 static bool libcurl_initialized; 66 67 typedef struct CURLAIOCB { 68 Coroutine *co; 69 QEMUIOVector *qiov; 70 71 uint64_t offset; 72 uint64_t bytes; 73 int ret; 74 75 size_t start; 76 size_t end; 77 } CURLAIOCB; 78 79 typedef struct CURLSocket { 80 int fd; 81 struct BDRVCURLState *s; 82 } CURLSocket; 83 84 typedef struct CURLState 85 { 86 struct BDRVCURLState *s; 87 CURLAIOCB *acb[CURL_NUM_ACB]; 88 CURL *curl; 89 char *orig_buf; 90 uint64_t buf_start; 91 size_t buf_off; 92 size_t buf_len; 93 char range[128]; 94 char errmsg[CURL_ERROR_SIZE]; 95 char in_use; 96 } CURLState; 97 98 typedef struct BDRVCURLState { 99 CURLM *multi; 100 QEMUTimer timer; 101 uint64_t len; 102 CURLState states[CURL_NUM_STATES]; 103 GHashTable *sockets; /* GINT_TO_POINTER(fd) -> socket */ 104 char *url; 105 size_t readahead_size; 106 bool sslverify; 107 uint64_t timeout; 108 char *cookie; 109 bool accept_range; 110 AioContext *aio_context; 111 QemuMutex mutex; 112 CoQueue free_state_waitq; 113 char *username; 114 char *password; 115 char *proxyusername; 116 char *proxypassword; 117 } BDRVCURLState; 118 119 static void curl_clean_state(CURLState *s); 120 static void curl_multi_do(void *arg); 121 122 static gboolean curl_drop_socket(void *key, void *value, void *opaque) 123 { 124 CURLSocket *socket = value; 125 BDRVCURLState *s = socket->s; 126 127 aio_set_fd_handler(s->aio_context, socket->fd, false, 128 NULL, NULL, NULL, NULL, NULL); 129 return true; 130 } 131 132 static void curl_drop_all_sockets(GHashTable *sockets) 133 { 134 g_hash_table_foreach_remove(sockets, curl_drop_socket, NULL); 135 } 136 137 /* Called from curl_multi_do_locked, with s->mutex held. */ 138 static int curl_timer_cb(CURLM *multi, long timeout_ms, void *opaque) 139 { 140 BDRVCURLState *s = opaque; 141 142 trace_curl_timer_cb(timeout_ms); 143 if (timeout_ms == -1) { 144 timer_del(&s->timer); 145 } else { 146 int64_t timeout_ns = (int64_t)timeout_ms * 1000 * 1000; 147 timer_mod(&s->timer, 148 qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + timeout_ns); 149 } 150 return 0; 151 } 152 153 /* Called from curl_multi_do_locked, with s->mutex held. */ 154 static int curl_sock_cb(CURL *curl, curl_socket_t fd, int action, 155 void *userp, void *sp) 156 { 157 BDRVCURLState *s; 158 CURLState *state = NULL; 159 CURLSocket *socket; 160 161 curl_easy_getinfo(curl, CURLINFO_PRIVATE, (char **)&state); 162 s = state->s; 163 164 socket = g_hash_table_lookup(s->sockets, GINT_TO_POINTER(fd)); 165 if (!socket) { 166 socket = g_new0(CURLSocket, 1); 167 socket->fd = fd; 168 socket->s = s; 169 g_hash_table_insert(s->sockets, GINT_TO_POINTER(fd), socket); 170 } 171 172 trace_curl_sock_cb(action, (int)fd); 173 switch (action) { 174 case CURL_POLL_IN: 175 aio_set_fd_handler(s->aio_context, fd, false, 176 curl_multi_do, NULL, NULL, NULL, socket); 177 break; 178 case CURL_POLL_OUT: 179 aio_set_fd_handler(s->aio_context, fd, false, 180 NULL, curl_multi_do, NULL, NULL, socket); 181 break; 182 case CURL_POLL_INOUT: 183 aio_set_fd_handler(s->aio_context, fd, false, 184 curl_multi_do, curl_multi_do, 185 NULL, NULL, socket); 186 break; 187 case CURL_POLL_REMOVE: 188 aio_set_fd_handler(s->aio_context, fd, false, 189 NULL, NULL, NULL, NULL, NULL); 190 break; 191 } 192 193 if (action == CURL_POLL_REMOVE) { 194 g_hash_table_remove(s->sockets, GINT_TO_POINTER(fd)); 195 } 196 197 return 0; 198 } 199 200 /* Called from curl_multi_do_locked, with s->mutex held. */ 201 static size_t curl_header_cb(void *ptr, size_t size, size_t nmemb, void *opaque) 202 { 203 BDRVCURLState *s = opaque; 204 size_t realsize = size * nmemb; 205 const char *header = (char *)ptr; 206 const char *end = header + realsize; 207 const char *accept_ranges = "accept-ranges:"; 208 const char *bytes = "bytes"; 209 210 if (realsize >= strlen(accept_ranges) 211 && g_ascii_strncasecmp(header, accept_ranges, 212 strlen(accept_ranges)) == 0) { 213 214 char *p = strchr(header, ':') + 1; 215 216 /* Skip whitespace between the header name and value. */ 217 while (p < end && *p && g_ascii_isspace(*p)) { 218 p++; 219 } 220 221 if (end - p >= strlen(bytes) 222 && strncmp(p, bytes, strlen(bytes)) == 0) { 223 224 /* Check that there is nothing but whitespace after the value. */ 225 p += strlen(bytes); 226 while (p < end && *p && g_ascii_isspace(*p)) { 227 p++; 228 } 229 230 if (p == end || !*p) { 231 s->accept_range = true; 232 } 233 } 234 } 235 236 return realsize; 237 } 238 239 /* Called from curl_multi_do_locked, with s->mutex held. */ 240 static size_t curl_read_cb(void *ptr, size_t size, size_t nmemb, void *opaque) 241 { 242 CURLState *s = ((CURLState*)opaque); 243 size_t realsize = size * nmemb; 244 245 trace_curl_read_cb(realsize); 246 247 if (!s || !s->orig_buf) { 248 goto read_end; 249 } 250 251 if (s->buf_off >= s->buf_len) { 252 /* buffer full, read nothing */ 253 goto read_end; 254 } 255 realsize = MIN(realsize, s->buf_len - s->buf_off); 256 memcpy(s->orig_buf + s->buf_off, ptr, realsize); 257 s->buf_off += realsize; 258 259 read_end: 260 /* curl will error out if we do not return this value */ 261 return size * nmemb; 262 } 263 264 /* Called with s->mutex held. */ 265 static bool curl_find_buf(BDRVCURLState *s, uint64_t start, uint64_t len, 266 CURLAIOCB *acb) 267 { 268 int i; 269 uint64_t end = start + len; 270 uint64_t clamped_end = MIN(end, s->len); 271 uint64_t clamped_len = clamped_end - start; 272 273 for (i=0; i<CURL_NUM_STATES; i++) { 274 CURLState *state = &s->states[i]; 275 uint64_t buf_end = (state->buf_start + state->buf_off); 276 uint64_t buf_fend = (state->buf_start + state->buf_len); 277 278 if (!state->orig_buf) 279 continue; 280 if (!state->buf_off) 281 continue; 282 283 // Does the existing buffer cover our section? 284 if ((start >= state->buf_start) && 285 (start <= buf_end) && 286 (clamped_end >= state->buf_start) && 287 (clamped_end <= buf_end)) 288 { 289 char *buf = state->orig_buf + (start - state->buf_start); 290 291 qemu_iovec_from_buf(acb->qiov, 0, buf, clamped_len); 292 if (clamped_len < len) { 293 qemu_iovec_memset(acb->qiov, clamped_len, 0, len - clamped_len); 294 } 295 acb->ret = 0; 296 return true; 297 } 298 299 // Wait for unfinished chunks 300 if (state->in_use && 301 (start >= state->buf_start) && 302 (start <= buf_fend) && 303 (clamped_end >= state->buf_start) && 304 (clamped_end <= buf_fend)) 305 { 306 int j; 307 308 acb->start = start - state->buf_start; 309 acb->end = acb->start + clamped_len; 310 311 for (j=0; j<CURL_NUM_ACB; j++) { 312 if (!state->acb[j]) { 313 state->acb[j] = acb; 314 return true; 315 } 316 } 317 } 318 } 319 320 return false; 321 } 322 323 /* Called with s->mutex held. */ 324 static void curl_multi_check_completion(BDRVCURLState *s) 325 { 326 int msgs_in_queue; 327 328 /* Try to find done transfers, so we can free the easy 329 * handle again. */ 330 for (;;) { 331 CURLMsg *msg; 332 msg = curl_multi_info_read(s->multi, &msgs_in_queue); 333 334 /* Quit when there are no more completions */ 335 if (!msg) 336 break; 337 338 if (msg->msg == CURLMSG_DONE) { 339 int i; 340 CURLState *state = NULL; 341 bool error = msg->data.result != CURLE_OK; 342 343 curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE, 344 (char **)&state); 345 346 if (error) { 347 static int errcount = 100; 348 349 /* Don't lose the original error message from curl, since 350 * it contains extra data. 351 */ 352 if (errcount > 0) { 353 error_report("curl: %s", state->errmsg); 354 if (--errcount == 0) { 355 error_report("curl: further errors suppressed"); 356 } 357 } 358 } 359 360 for (i = 0; i < CURL_NUM_ACB; i++) { 361 CURLAIOCB *acb = state->acb[i]; 362 363 if (acb == NULL) { 364 continue; 365 } 366 367 if (!error) { 368 /* Assert that we have read all data */ 369 assert(state->buf_off >= acb->end); 370 371 qemu_iovec_from_buf(acb->qiov, 0, 372 state->orig_buf + acb->start, 373 acb->end - acb->start); 374 375 if (acb->end - acb->start < acb->bytes) { 376 size_t offset = acb->end - acb->start; 377 qemu_iovec_memset(acb->qiov, offset, 0, 378 acb->bytes - offset); 379 } 380 } 381 382 acb->ret = error ? -EIO : 0; 383 state->acb[i] = NULL; 384 qemu_mutex_unlock(&s->mutex); 385 aio_co_wake(acb->co); 386 qemu_mutex_lock(&s->mutex); 387 } 388 389 curl_clean_state(state); 390 break; 391 } 392 } 393 } 394 395 /* Called with s->mutex held. */ 396 static void curl_multi_do_locked(CURLSocket *socket) 397 { 398 BDRVCURLState *s = socket->s; 399 int running; 400 int r; 401 402 if (!s->multi) { 403 return; 404 } 405 406 do { 407 r = curl_multi_socket_action(s->multi, socket->fd, 0, &running); 408 } while (r == CURLM_CALL_MULTI_PERFORM); 409 } 410 411 static void curl_multi_do(void *arg) 412 { 413 CURLSocket *socket = arg; 414 BDRVCURLState *s = socket->s; 415 416 qemu_mutex_lock(&s->mutex); 417 curl_multi_do_locked(socket); 418 curl_multi_check_completion(s); 419 qemu_mutex_unlock(&s->mutex); 420 } 421 422 static void curl_multi_timeout_do(void *arg) 423 { 424 BDRVCURLState *s = (BDRVCURLState *)arg; 425 int running; 426 427 if (!s->multi) { 428 return; 429 } 430 431 qemu_mutex_lock(&s->mutex); 432 curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running); 433 434 curl_multi_check_completion(s); 435 qemu_mutex_unlock(&s->mutex); 436 } 437 438 /* Called with s->mutex held. */ 439 static CURLState *curl_find_state(BDRVCURLState *s) 440 { 441 CURLState *state = NULL; 442 int i; 443 444 for (i = 0; i < CURL_NUM_STATES; i++) { 445 if (!s->states[i].in_use) { 446 state = &s->states[i]; 447 state->in_use = 1; 448 break; 449 } 450 } 451 return state; 452 } 453 454 static int curl_init_state(BDRVCURLState *s, CURLState *state) 455 { 456 if (!state->curl) { 457 state->curl = curl_easy_init(); 458 if (!state->curl) { 459 return -EIO; 460 } 461 if (curl_easy_setopt(state->curl, CURLOPT_URL, s->url) || 462 curl_easy_setopt(state->curl, CURLOPT_SSL_VERIFYPEER, 463 (long) s->sslverify) || 464 curl_easy_setopt(state->curl, CURLOPT_SSL_VERIFYHOST, 465 s->sslverify ? 2L : 0L)) { 466 goto err; 467 } 468 if (s->cookie) { 469 if (curl_easy_setopt(state->curl, CURLOPT_COOKIE, s->cookie)) { 470 goto err; 471 } 472 } 473 if (curl_easy_setopt(state->curl, CURLOPT_TIMEOUT, (long)s->timeout) || 474 curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION, 475 (void *)curl_read_cb) || 476 curl_easy_setopt(state->curl, CURLOPT_WRITEDATA, (void *)state) || 477 curl_easy_setopt(state->curl, CURLOPT_PRIVATE, (void *)state) || 478 curl_easy_setopt(state->curl, CURLOPT_AUTOREFERER, 1) || 479 curl_easy_setopt(state->curl, CURLOPT_FOLLOWLOCATION, 1) || 480 curl_easy_setopt(state->curl, CURLOPT_NOSIGNAL, 1) || 481 curl_easy_setopt(state->curl, CURLOPT_ERRORBUFFER, state->errmsg) || 482 curl_easy_setopt(state->curl, CURLOPT_FAILONERROR, 1)) { 483 goto err; 484 } 485 if (s->username) { 486 if (curl_easy_setopt(state->curl, CURLOPT_USERNAME, s->username)) { 487 goto err; 488 } 489 } 490 if (s->password) { 491 if (curl_easy_setopt(state->curl, CURLOPT_PASSWORD, s->password)) { 492 goto err; 493 } 494 } 495 if (s->proxyusername) { 496 if (curl_easy_setopt(state->curl, 497 CURLOPT_PROXYUSERNAME, s->proxyusername)) { 498 goto err; 499 } 500 } 501 if (s->proxypassword) { 502 if (curl_easy_setopt(state->curl, 503 CURLOPT_PROXYPASSWORD, s->proxypassword)) { 504 goto err; 505 } 506 } 507 508 /* Restrict supported protocols to avoid security issues in the more 509 * obscure protocols. For example, do not allow POP3/SMTP/IMAP see 510 * CVE-2013-0249. 511 * 512 * Restricting protocols is only supported from 7.19.4 upwards. 513 */ 514 #if LIBCURL_VERSION_NUM >= 0x071304 515 if (curl_easy_setopt(state->curl, CURLOPT_PROTOCOLS, PROTOCOLS) || 516 curl_easy_setopt(state->curl, CURLOPT_REDIR_PROTOCOLS, PROTOCOLS)) { 517 goto err; 518 } 519 #endif 520 521 #ifdef DEBUG_VERBOSE 522 if (curl_easy_setopt(state->curl, CURLOPT_VERBOSE, 1)) { 523 goto err; 524 } 525 #endif 526 } 527 528 state->s = s; 529 530 return 0; 531 532 err: 533 curl_easy_cleanup(state->curl); 534 state->curl = NULL; 535 return -EIO; 536 } 537 538 /* Called with s->mutex held. */ 539 static void curl_clean_state(CURLState *s) 540 { 541 int j; 542 for (j = 0; j < CURL_NUM_ACB; j++) { 543 assert(!s->acb[j]); 544 } 545 546 if (s->s->multi) 547 curl_multi_remove_handle(s->s->multi, s->curl); 548 549 s->in_use = 0; 550 551 qemu_co_enter_next(&s->s->free_state_waitq, &s->s->mutex); 552 } 553 554 static void curl_parse_filename(const char *filename, QDict *options, 555 Error **errp) 556 { 557 qdict_put_str(options, CURL_BLOCK_OPT_URL, filename); 558 } 559 560 static void curl_detach_aio_context(BlockDriverState *bs) 561 { 562 BDRVCURLState *s = bs->opaque; 563 int i; 564 565 WITH_QEMU_LOCK_GUARD(&s->mutex) { 566 curl_drop_all_sockets(s->sockets); 567 for (i = 0; i < CURL_NUM_STATES; i++) { 568 if (s->states[i].in_use) { 569 curl_clean_state(&s->states[i]); 570 } 571 if (s->states[i].curl) { 572 curl_easy_cleanup(s->states[i].curl); 573 s->states[i].curl = NULL; 574 } 575 g_free(s->states[i].orig_buf); 576 s->states[i].orig_buf = NULL; 577 } 578 if (s->multi) { 579 curl_multi_cleanup(s->multi); 580 s->multi = NULL; 581 } 582 } 583 584 timer_del(&s->timer); 585 } 586 587 static void curl_attach_aio_context(BlockDriverState *bs, 588 AioContext *new_context) 589 { 590 BDRVCURLState *s = bs->opaque; 591 592 aio_timer_init(new_context, &s->timer, 593 QEMU_CLOCK_REALTIME, SCALE_NS, 594 curl_multi_timeout_do, s); 595 596 assert(!s->multi); 597 s->multi = curl_multi_init(); 598 s->aio_context = new_context; 599 curl_multi_setopt(s->multi, CURLMOPT_SOCKETFUNCTION, curl_sock_cb); 600 curl_multi_setopt(s->multi, CURLMOPT_TIMERDATA, s); 601 curl_multi_setopt(s->multi, CURLMOPT_TIMERFUNCTION, curl_timer_cb); 602 } 603 604 static QemuOptsList runtime_opts = { 605 .name = "curl", 606 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head), 607 .desc = { 608 { 609 .name = CURL_BLOCK_OPT_URL, 610 .type = QEMU_OPT_STRING, 611 .help = "URL to open", 612 }, 613 { 614 .name = CURL_BLOCK_OPT_READAHEAD, 615 .type = QEMU_OPT_SIZE, 616 .help = "Readahead size", 617 }, 618 { 619 .name = CURL_BLOCK_OPT_SSLVERIFY, 620 .type = QEMU_OPT_BOOL, 621 .help = "Verify SSL certificate" 622 }, 623 { 624 .name = CURL_BLOCK_OPT_TIMEOUT, 625 .type = QEMU_OPT_NUMBER, 626 .help = "Curl timeout" 627 }, 628 { 629 .name = CURL_BLOCK_OPT_COOKIE, 630 .type = QEMU_OPT_STRING, 631 .help = "Pass the cookie or list of cookies with each request" 632 }, 633 { 634 .name = CURL_BLOCK_OPT_COOKIE_SECRET, 635 .type = QEMU_OPT_STRING, 636 .help = "ID of secret used as cookie passed with each request" 637 }, 638 { 639 .name = CURL_BLOCK_OPT_USERNAME, 640 .type = QEMU_OPT_STRING, 641 .help = "Username for HTTP auth" 642 }, 643 { 644 .name = CURL_BLOCK_OPT_PASSWORD_SECRET, 645 .type = QEMU_OPT_STRING, 646 .help = "ID of secret used as password for HTTP auth", 647 }, 648 { 649 .name = CURL_BLOCK_OPT_PROXY_USERNAME, 650 .type = QEMU_OPT_STRING, 651 .help = "Username for HTTP proxy auth" 652 }, 653 { 654 .name = CURL_BLOCK_OPT_PROXY_PASSWORD_SECRET, 655 .type = QEMU_OPT_STRING, 656 .help = "ID of secret used as password for HTTP proxy auth", 657 }, 658 { /* end of list */ } 659 }, 660 }; 661 662 663 static int curl_open(BlockDriverState *bs, QDict *options, int flags, 664 Error **errp) 665 { 666 BDRVCURLState *s = bs->opaque; 667 CURLState *state = NULL; 668 QemuOpts *opts; 669 const char *file; 670 const char *cookie; 671 const char *cookie_secret; 672 double d; 673 const char *secretid; 674 const char *protocol_delimiter; 675 int ret; 676 677 ret = bdrv_apply_auto_read_only(bs, "curl driver does not support writes", 678 errp); 679 if (ret < 0) { 680 return ret; 681 } 682 683 if (!libcurl_initialized) { 684 ret = curl_global_init(CURL_GLOBAL_ALL); 685 if (ret) { 686 error_setg(errp, "libcurl initialization failed with %d", ret); 687 return -EIO; 688 } 689 libcurl_initialized = true; 690 } 691 692 qemu_mutex_init(&s->mutex); 693 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort); 694 if (!qemu_opts_absorb_qdict(opts, options, errp)) { 695 goto out_noclean; 696 } 697 698 s->readahead_size = qemu_opt_get_size(opts, CURL_BLOCK_OPT_READAHEAD, 699 CURL_BLOCK_OPT_READAHEAD_DEFAULT); 700 if ((s->readahead_size & 0x1ff) != 0) { 701 error_setg(errp, "HTTP_READAHEAD_SIZE %zd is not a multiple of 512", 702 s->readahead_size); 703 goto out_noclean; 704 } 705 706 s->timeout = qemu_opt_get_number(opts, CURL_BLOCK_OPT_TIMEOUT, 707 CURL_BLOCK_OPT_TIMEOUT_DEFAULT); 708 if (s->timeout > CURL_TIMEOUT_MAX) { 709 error_setg(errp, "timeout parameter is too large or negative"); 710 goto out_noclean; 711 } 712 713 s->sslverify = qemu_opt_get_bool(opts, CURL_BLOCK_OPT_SSLVERIFY, 714 CURL_BLOCK_OPT_SSLVERIFY_DEFAULT); 715 716 cookie = qemu_opt_get(opts, CURL_BLOCK_OPT_COOKIE); 717 cookie_secret = qemu_opt_get(opts, CURL_BLOCK_OPT_COOKIE_SECRET); 718 719 if (cookie && cookie_secret) { 720 error_setg(errp, 721 "curl driver cannot handle both cookie and cookie secret"); 722 goto out_noclean; 723 } 724 725 if (cookie_secret) { 726 s->cookie = qcrypto_secret_lookup_as_utf8(cookie_secret, errp); 727 if (!s->cookie) { 728 goto out_noclean; 729 } 730 } else { 731 s->cookie = g_strdup(cookie); 732 } 733 734 file = qemu_opt_get(opts, CURL_BLOCK_OPT_URL); 735 if (file == NULL) { 736 error_setg(errp, "curl block driver requires an 'url' option"); 737 goto out_noclean; 738 } 739 740 if (!strstart(file, bs->drv->protocol_name, &protocol_delimiter) || 741 !strstart(protocol_delimiter, "://", NULL)) 742 { 743 error_setg(errp, "%s curl driver cannot handle the URL '%s' (does not " 744 "start with '%s://')", bs->drv->protocol_name, file, 745 bs->drv->protocol_name); 746 goto out_noclean; 747 } 748 749 s->username = g_strdup(qemu_opt_get(opts, CURL_BLOCK_OPT_USERNAME)); 750 secretid = qemu_opt_get(opts, CURL_BLOCK_OPT_PASSWORD_SECRET); 751 752 if (secretid) { 753 s->password = qcrypto_secret_lookup_as_utf8(secretid, errp); 754 if (!s->password) { 755 goto out_noclean; 756 } 757 } 758 759 s->proxyusername = g_strdup( 760 qemu_opt_get(opts, CURL_BLOCK_OPT_PROXY_USERNAME)); 761 secretid = qemu_opt_get(opts, CURL_BLOCK_OPT_PROXY_PASSWORD_SECRET); 762 if (secretid) { 763 s->proxypassword = qcrypto_secret_lookup_as_utf8(secretid, errp); 764 if (!s->proxypassword) { 765 goto out_noclean; 766 } 767 } 768 769 trace_curl_open(file); 770 qemu_co_queue_init(&s->free_state_waitq); 771 s->aio_context = bdrv_get_aio_context(bs); 772 s->url = g_strdup(file); 773 s->sockets = g_hash_table_new_full(NULL, NULL, NULL, g_free); 774 qemu_mutex_lock(&s->mutex); 775 state = curl_find_state(s); 776 qemu_mutex_unlock(&s->mutex); 777 if (!state) { 778 goto out_noclean; 779 } 780 781 // Get file size 782 783 if (curl_init_state(s, state) < 0) { 784 pstrcpy(state->errmsg, CURL_ERROR_SIZE, 785 "curl library initialization failed."); 786 goto out; 787 } 788 789 s->accept_range = false; 790 if (curl_easy_setopt(state->curl, CURLOPT_NOBODY, 1) || 791 curl_easy_setopt(state->curl, CURLOPT_HEADERFUNCTION, curl_header_cb) || 792 curl_easy_setopt(state->curl, CURLOPT_HEADERDATA, s)) { 793 pstrcpy(state->errmsg, CURL_ERROR_SIZE, 794 "curl library initialization failed."); 795 goto out; 796 } 797 if (curl_easy_perform(state->curl)) 798 goto out; 799 if (curl_easy_getinfo(state->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &d)) { 800 goto out; 801 } 802 /* Prior CURL 7.19.4 return value of 0 could mean that the file size is not 803 * know or the size is zero. From 7.19.4 CURL returns -1 if size is not 804 * known and zero if it is really zero-length file. */ 805 #if LIBCURL_VERSION_NUM >= 0x071304 806 if (d < 0) { 807 pstrcpy(state->errmsg, CURL_ERROR_SIZE, 808 "Server didn't report file size."); 809 goto out; 810 } 811 #else 812 if (d <= 0) { 813 pstrcpy(state->errmsg, CURL_ERROR_SIZE, 814 "Unknown file size or zero-length file."); 815 goto out; 816 } 817 #endif 818 819 s->len = d; 820 821 if ((!strncasecmp(s->url, "http://", strlen("http://")) 822 || !strncasecmp(s->url, "https://", strlen("https://"))) 823 && !s->accept_range) { 824 pstrcpy(state->errmsg, CURL_ERROR_SIZE, 825 "Server does not support 'range' (byte ranges)."); 826 goto out; 827 } 828 trace_curl_open_size(s->len); 829 830 qemu_mutex_lock(&s->mutex); 831 curl_clean_state(state); 832 qemu_mutex_unlock(&s->mutex); 833 curl_easy_cleanup(state->curl); 834 state->curl = NULL; 835 836 curl_attach_aio_context(bs, bdrv_get_aio_context(bs)); 837 838 qemu_opts_del(opts); 839 return 0; 840 841 out: 842 error_setg(errp, "CURL: Error opening file: %s", state->errmsg); 843 curl_easy_cleanup(state->curl); 844 state->curl = NULL; 845 out_noclean: 846 qemu_mutex_destroy(&s->mutex); 847 g_free(s->cookie); 848 g_free(s->url); 849 g_free(s->username); 850 g_free(s->proxyusername); 851 g_free(s->proxypassword); 852 curl_drop_all_sockets(s->sockets); 853 g_hash_table_destroy(s->sockets); 854 qemu_opts_del(opts); 855 return -EINVAL; 856 } 857 858 static void coroutine_fn curl_setup_preadv(BlockDriverState *bs, CURLAIOCB *acb) 859 { 860 CURLState *state; 861 int running; 862 863 BDRVCURLState *s = bs->opaque; 864 865 uint64_t start = acb->offset; 866 uint64_t end; 867 868 qemu_mutex_lock(&s->mutex); 869 870 // In case we have the requested data already (e.g. read-ahead), 871 // we can just call the callback and be done. 872 if (curl_find_buf(s, start, acb->bytes, acb)) { 873 goto out; 874 } 875 876 // No cache found, so let's start a new request 877 for (;;) { 878 state = curl_find_state(s); 879 if (state) { 880 break; 881 } 882 qemu_co_queue_wait(&s->free_state_waitq, &s->mutex); 883 } 884 885 if (curl_init_state(s, state) < 0) { 886 curl_clean_state(state); 887 acb->ret = -EIO; 888 goto out; 889 } 890 891 acb->start = 0; 892 acb->end = MIN(acb->bytes, s->len - start); 893 894 state->buf_off = 0; 895 g_free(state->orig_buf); 896 state->buf_start = start; 897 state->buf_len = MIN(acb->end + s->readahead_size, s->len - start); 898 end = start + state->buf_len - 1; 899 state->orig_buf = g_try_malloc(state->buf_len); 900 if (state->buf_len && state->orig_buf == NULL) { 901 curl_clean_state(state); 902 acb->ret = -ENOMEM; 903 goto out; 904 } 905 state->acb[0] = acb; 906 907 snprintf(state->range, 127, "%" PRIu64 "-%" PRIu64, start, end); 908 trace_curl_setup_preadv(acb->bytes, start, state->range); 909 if (curl_easy_setopt(state->curl, CURLOPT_RANGE, state->range) || 910 curl_multi_add_handle(s->multi, state->curl) != CURLM_OK) { 911 state->acb[0] = NULL; 912 acb->ret = -EIO; 913 914 curl_clean_state(state); 915 goto out; 916 } 917 918 /* Tell curl it needs to kick things off */ 919 curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running); 920 921 out: 922 qemu_mutex_unlock(&s->mutex); 923 } 924 925 static int coroutine_fn curl_co_preadv(BlockDriverState *bs, 926 int64_t offset, int64_t bytes, QEMUIOVector *qiov, 927 BdrvRequestFlags flags) 928 { 929 CURLAIOCB acb = { 930 .co = qemu_coroutine_self(), 931 .ret = -EINPROGRESS, 932 .qiov = qiov, 933 .offset = offset, 934 .bytes = bytes 935 }; 936 937 curl_setup_preadv(bs, &acb); 938 while (acb.ret == -EINPROGRESS) { 939 qemu_coroutine_yield(); 940 } 941 return acb.ret; 942 } 943 944 static void curl_close(BlockDriverState *bs) 945 { 946 BDRVCURLState *s = bs->opaque; 947 948 trace_curl_close(); 949 curl_detach_aio_context(bs); 950 qemu_mutex_destroy(&s->mutex); 951 952 g_hash_table_destroy(s->sockets); 953 g_free(s->cookie); 954 g_free(s->url); 955 g_free(s->username); 956 g_free(s->proxyusername); 957 g_free(s->proxypassword); 958 } 959 960 static int64_t curl_getlength(BlockDriverState *bs) 961 { 962 BDRVCURLState *s = bs->opaque; 963 return s->len; 964 } 965 966 static void curl_refresh_filename(BlockDriverState *bs) 967 { 968 BDRVCURLState *s = bs->opaque; 969 970 /* "readahead" and "timeout" do not change the guest-visible data, 971 * so ignore them */ 972 if (s->sslverify != CURL_BLOCK_OPT_SSLVERIFY_DEFAULT || 973 s->cookie || s->username || s->password || s->proxyusername || 974 s->proxypassword) 975 { 976 return; 977 } 978 979 pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), s->url); 980 } 981 982 983 static const char *const curl_strong_runtime_opts[] = { 984 CURL_BLOCK_OPT_URL, 985 CURL_BLOCK_OPT_SSLVERIFY, 986 CURL_BLOCK_OPT_COOKIE, 987 CURL_BLOCK_OPT_COOKIE_SECRET, 988 CURL_BLOCK_OPT_USERNAME, 989 CURL_BLOCK_OPT_PASSWORD_SECRET, 990 CURL_BLOCK_OPT_PROXY_USERNAME, 991 CURL_BLOCK_OPT_PROXY_PASSWORD_SECRET, 992 993 NULL 994 }; 995 996 static BlockDriver bdrv_http = { 997 .format_name = "http", 998 .protocol_name = "http", 999 1000 .instance_size = sizeof(BDRVCURLState), 1001 .bdrv_parse_filename = curl_parse_filename, 1002 .bdrv_file_open = curl_open, 1003 .bdrv_close = curl_close, 1004 .bdrv_getlength = curl_getlength, 1005 1006 .bdrv_co_preadv = curl_co_preadv, 1007 1008 .bdrv_detach_aio_context = curl_detach_aio_context, 1009 .bdrv_attach_aio_context = curl_attach_aio_context, 1010 1011 .bdrv_refresh_filename = curl_refresh_filename, 1012 .strong_runtime_opts = curl_strong_runtime_opts, 1013 }; 1014 1015 static BlockDriver bdrv_https = { 1016 .format_name = "https", 1017 .protocol_name = "https", 1018 1019 .instance_size = sizeof(BDRVCURLState), 1020 .bdrv_parse_filename = curl_parse_filename, 1021 .bdrv_file_open = curl_open, 1022 .bdrv_close = curl_close, 1023 .bdrv_getlength = curl_getlength, 1024 1025 .bdrv_co_preadv = curl_co_preadv, 1026 1027 .bdrv_detach_aio_context = curl_detach_aio_context, 1028 .bdrv_attach_aio_context = curl_attach_aio_context, 1029 1030 .bdrv_refresh_filename = curl_refresh_filename, 1031 .strong_runtime_opts = curl_strong_runtime_opts, 1032 }; 1033 1034 static BlockDriver bdrv_ftp = { 1035 .format_name = "ftp", 1036 .protocol_name = "ftp", 1037 1038 .instance_size = sizeof(BDRVCURLState), 1039 .bdrv_parse_filename = curl_parse_filename, 1040 .bdrv_file_open = curl_open, 1041 .bdrv_close = curl_close, 1042 .bdrv_getlength = curl_getlength, 1043 1044 .bdrv_co_preadv = curl_co_preadv, 1045 1046 .bdrv_detach_aio_context = curl_detach_aio_context, 1047 .bdrv_attach_aio_context = curl_attach_aio_context, 1048 1049 .bdrv_refresh_filename = curl_refresh_filename, 1050 .strong_runtime_opts = curl_strong_runtime_opts, 1051 }; 1052 1053 static BlockDriver bdrv_ftps = { 1054 .format_name = "ftps", 1055 .protocol_name = "ftps", 1056 1057 .instance_size = sizeof(BDRVCURLState), 1058 .bdrv_parse_filename = curl_parse_filename, 1059 .bdrv_file_open = curl_open, 1060 .bdrv_close = curl_close, 1061 .bdrv_getlength = curl_getlength, 1062 1063 .bdrv_co_preadv = curl_co_preadv, 1064 1065 .bdrv_detach_aio_context = curl_detach_aio_context, 1066 .bdrv_attach_aio_context = curl_attach_aio_context, 1067 1068 .bdrv_refresh_filename = curl_refresh_filename, 1069 .strong_runtime_opts = curl_strong_runtime_opts, 1070 }; 1071 1072 static void curl_block_init(void) 1073 { 1074 bdrv_register(&bdrv_http); 1075 bdrv_register(&bdrv_https); 1076 bdrv_register(&bdrv_ftp); 1077 bdrv_register(&bdrv_ftps); 1078 } 1079 1080 block_init(curl_block_init); 1081