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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
39
40#if LIBCURL_VERSION_NUM >= 0x071000
41
42#define NEED_CURL_TIMER_CALLBACK
43#define HAVE_SOCKET_ACTION
44#endif
45
46#ifndef HAVE_SOCKET_ACTION
47
48
49
50static 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
63#define CURL_NUM_STATES 8
64#define CURL_NUM_ACB 8
65#define CURL_TIMEOUT_MAX 10000
66
67#define CURL_BLOCK_OPT_URL "url"
68#define CURL_BLOCK_OPT_READAHEAD "readahead"
69#define CURL_BLOCK_OPT_SSLVERIFY "sslverify"
70#define CURL_BLOCK_OPT_TIMEOUT "timeout"
71#define CURL_BLOCK_OPT_COOKIE "cookie"
72#define CURL_BLOCK_OPT_COOKIE_SECRET "cookie-secret"
73#define CURL_BLOCK_OPT_USERNAME "username"
74#define CURL_BLOCK_OPT_PASSWORD_SECRET "password-secret"
75#define CURL_BLOCK_OPT_PROXY_USERNAME "proxy-username"
76#define CURL_BLOCK_OPT_PROXY_PASSWORD_SECRET "proxy-password-secret"
77
78#define CURL_BLOCK_OPT_READAHEAD_DEFAULT (256 * 1024)
79#define CURL_BLOCK_OPT_SSLVERIFY_DEFAULT true
80#define CURL_BLOCK_OPT_TIMEOUT_DEFAULT 5
81
82struct BDRVCURLState;
83struct CURLState;
84
85static bool libcurl_initialized;
86
87typedef struct CURLAIOCB {
88 Coroutine *co;
89 QEMUIOVector *qiov;
90
91 uint64_t offset;
92 uint64_t bytes;
93 int ret;
94
95 size_t start;
96 size_t end;
97} CURLAIOCB;
98
99typedef struct CURLSocket {
100 int fd;
101 struct CURLState *state;
102 QLIST_ENTRY(CURLSocket) next;
103} CURLSocket;
104
105typedef struct CURLState
106{
107 struct BDRVCURLState *s;
108 CURLAIOCB *acb[CURL_NUM_ACB];
109 CURL *curl;
110 QLIST_HEAD(, CURLSocket) sockets;
111 char *orig_buf;
112 uint64_t buf_start;
113 size_t buf_off;
114 size_t buf_len;
115 char range[128];
116 char errmsg[CURL_ERROR_SIZE];
117 char in_use;
118} CURLState;
119
120typedef struct BDRVCURLState {
121 CURLM *multi;
122 QEMUTimer timer;
123 uint64_t len;
124 CURLState states[CURL_NUM_STATES];
125 char *url;
126 size_t readahead_size;
127 bool sslverify;
128 uint64_t timeout;
129 char *cookie;
130 bool accept_range;
131 AioContext *aio_context;
132 QemuMutex mutex;
133 CoQueue free_state_waitq;
134 char *username;
135 char *password;
136 char *proxyusername;
137 char *proxypassword;
138} BDRVCURLState;
139
140static void curl_clean_state(CURLState *s);
141static void curl_multi_do(void *arg);
142
143#ifdef NEED_CURL_TIMER_CALLBACK
144
145static int curl_timer_cb(CURLM *multi, long timeout_ms, void *opaque)
146{
147 BDRVCURLState *s = opaque;
148
149 trace_curl_timer_cb(timeout_ms);
150 if (timeout_ms == -1) {
151 timer_del(&s->timer);
152 } else {
153 int64_t timeout_ns = (int64_t)timeout_ms * 1000 * 1000;
154 timer_mod(&s->timer,
155 qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + timeout_ns);
156 }
157 return 0;
158}
159#endif
160
161
162static int curl_sock_cb(CURL *curl, curl_socket_t fd, int action,
163 void *userp, void *sp)
164{
165 BDRVCURLState *s;
166 CURLState *state = NULL;
167 CURLSocket *socket;
168
169 curl_easy_getinfo(curl, CURLINFO_PRIVATE, (char **)&state);
170 s = state->s;
171
172 QLIST_FOREACH(socket, &state->sockets, next) {
173 if (socket->fd == fd) {
174 break;
175 }
176 }
177 if (!socket) {
178 socket = g_new0(CURLSocket, 1);
179 socket->fd = fd;
180 socket->state = state;
181 QLIST_INSERT_HEAD(&state->sockets, socket, next);
182 }
183
184 trace_curl_sock_cb(action, (int)fd);
185 switch (action) {
186 case CURL_POLL_IN:
187 aio_set_fd_handler(s->aio_context, fd, false,
188 curl_multi_do, NULL, NULL, socket);
189 break;
190 case CURL_POLL_OUT:
191 aio_set_fd_handler(s->aio_context, fd, false,
192 NULL, curl_multi_do, NULL, socket);
193 break;
194 case CURL_POLL_INOUT:
195 aio_set_fd_handler(s->aio_context, fd, false,
196 curl_multi_do, curl_multi_do, NULL, socket);
197 break;
198 case CURL_POLL_REMOVE:
199 aio_set_fd_handler(s->aio_context, fd, false,
200 NULL, NULL, NULL, NULL);
201 break;
202 }
203
204 if (action == CURL_POLL_REMOVE) {
205 QLIST_REMOVE(socket, next);
206 g_free(socket);
207 }
208
209 return 0;
210}
211
212
213static size_t curl_header_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
214{
215 BDRVCURLState *s = opaque;
216 size_t realsize = size * nmemb;
217 const char *accept_line = "Accept-Ranges: bytes";
218
219 if (realsize >= strlen(accept_line)
220 && strncmp((char *)ptr, accept_line, strlen(accept_line)) == 0) {
221 s->accept_range = true;
222 }
223
224 return realsize;
225}
226
227
228static size_t curl_read_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
229{
230 CURLState *s = ((CURLState*)opaque);
231 size_t realsize = size * nmemb;
232
233 trace_curl_read_cb(realsize);
234
235 if (!s || !s->orig_buf) {
236 goto read_end;
237 }
238
239 if (s->buf_off >= s->buf_len) {
240
241 goto read_end;
242 }
243 realsize = MIN(realsize, s->buf_len - s->buf_off);
244 memcpy(s->orig_buf + s->buf_off, ptr, realsize);
245 s->buf_off += realsize;
246
247read_end:
248
249 return size * nmemb;
250}
251
252
253static bool curl_find_buf(BDRVCURLState *s, uint64_t start, uint64_t len,
254 CURLAIOCB *acb)
255{
256 int i;
257 uint64_t end = start + len;
258 uint64_t clamped_end = MIN(end, s->len);
259 uint64_t clamped_len = clamped_end - start;
260
261 for (i=0; i<CURL_NUM_STATES; i++) {
262 CURLState *state = &s->states[i];
263 uint64_t buf_end = (state->buf_start + state->buf_off);
264 uint64_t buf_fend = (state->buf_start + state->buf_len);
265
266 if (!state->orig_buf)
267 continue;
268 if (!state->buf_off)
269 continue;
270
271
272 if ((start >= state->buf_start) &&
273 (start <= buf_end) &&
274 (clamped_end >= state->buf_start) &&
275 (clamped_end <= buf_end))
276 {
277 char *buf = state->orig_buf + (start - state->buf_start);
278
279 qemu_iovec_from_buf(acb->qiov, 0, buf, clamped_len);
280 if (clamped_len < len) {
281 qemu_iovec_memset(acb->qiov, clamped_len, 0, len - clamped_len);
282 }
283 acb->ret = 0;
284 return true;
285 }
286
287
288 if (state->in_use &&
289 (start >= state->buf_start) &&
290 (start <= buf_fend) &&
291 (clamped_end >= state->buf_start) &&
292 (clamped_end <= buf_fend))
293 {
294 int j;
295
296 acb->start = start - state->buf_start;
297 acb->end = acb->start + clamped_len;
298
299 for (j=0; j<CURL_NUM_ACB; j++) {
300 if (!state->acb[j]) {
301 state->acb[j] = acb;
302 return true;
303 }
304 }
305 }
306 }
307
308 return false;
309}
310
311
312static void curl_multi_check_completion(BDRVCURLState *s)
313{
314 int msgs_in_queue;
315
316
317
318 for (;;) {
319 CURLMsg *msg;
320 msg = curl_multi_info_read(s->multi, &msgs_in_queue);
321
322
323 if (!msg)
324 break;
325
326 if (msg->msg == CURLMSG_DONE) {
327 int i;
328 CURLState *state = NULL;
329 bool error = msg->data.result != CURLE_OK;
330
331 curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE,
332 (char **)&state);
333
334 if (error) {
335 static int errcount = 100;
336
337
338
339
340 if (errcount > 0) {
341 error_report("curl: %s", state->errmsg);
342 if (--errcount == 0) {
343 error_report("curl: further errors suppressed");
344 }
345 }
346 }
347
348 for (i = 0; i < CURL_NUM_ACB; i++) {
349 CURLAIOCB *acb = state->acb[i];
350
351 if (acb == NULL) {
352 continue;
353 }
354
355 if (!error) {
356
357 assert(state->buf_off >= acb->end);
358
359 qemu_iovec_from_buf(acb->qiov, 0,
360 state->orig_buf + acb->start,
361 acb->end - acb->start);
362
363 if (acb->end - acb->start < acb->bytes) {
364 size_t offset = acb->end - acb->start;
365 qemu_iovec_memset(acb->qiov, offset, 0,
366 acb->bytes - offset);
367 }
368 }
369
370 acb->ret = error ? -EIO : 0;
371 state->acb[i] = NULL;
372 qemu_mutex_unlock(&s->mutex);
373 aio_co_wake(acb->co);
374 qemu_mutex_lock(&s->mutex);
375 }
376
377 curl_clean_state(state);
378 break;
379 }
380 }
381}
382
383
384static void curl_multi_do_locked(CURLSocket *socket)
385{
386 BDRVCURLState *s = socket->state->s;
387 int running;
388 int r;
389
390 if (!s->multi) {
391 return;
392 }
393
394 do {
395 r = curl_multi_socket_action(s->multi, socket->fd, 0, &running);
396 } while (r == CURLM_CALL_MULTI_PERFORM);
397}
398
399static void curl_multi_do(void *arg)
400{
401 CURLSocket *socket = arg;
402 BDRVCURLState *s = socket->state->s;
403
404 qemu_mutex_lock(&s->mutex);
405 curl_multi_do_locked(socket);
406 curl_multi_check_completion(s);
407 qemu_mutex_unlock(&s->mutex);
408}
409
410static void curl_multi_timeout_do(void *arg)
411{
412#ifdef NEED_CURL_TIMER_CALLBACK
413 BDRVCURLState *s = (BDRVCURLState *)arg;
414 int running;
415
416 if (!s->multi) {
417 return;
418 }
419
420 qemu_mutex_lock(&s->mutex);
421 curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running);
422
423 curl_multi_check_completion(s);
424 qemu_mutex_unlock(&s->mutex);
425#else
426 abort();
427#endif
428}
429
430
431static CURLState *curl_find_state(BDRVCURLState *s)
432{
433 CURLState *state = NULL;
434 int i;
435
436 for (i = 0; i < CURL_NUM_STATES; i++) {
437 if (!s->states[i].in_use) {
438 state = &s->states[i];
439 state->in_use = 1;
440 break;
441 }
442 }
443 return state;
444}
445
446static int curl_init_state(BDRVCURLState *s, CURLState *state)
447{
448 if (!state->curl) {
449 state->curl = curl_easy_init();
450 if (!state->curl) {
451 return -EIO;
452 }
453 curl_easy_setopt(state->curl, CURLOPT_URL, s->url);
454 curl_easy_setopt(state->curl, CURLOPT_SSL_VERIFYPEER,
455 (long) s->sslverify);
456 curl_easy_setopt(state->curl, CURLOPT_SSL_VERIFYHOST,
457 s->sslverify ? 2L : 0L);
458 if (s->cookie) {
459 curl_easy_setopt(state->curl, CURLOPT_COOKIE, s->cookie);
460 }
461 curl_easy_setopt(state->curl, CURLOPT_TIMEOUT, (long)s->timeout);
462 curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION,
463 (void *)curl_read_cb);
464 curl_easy_setopt(state->curl, CURLOPT_WRITEDATA, (void *)state);
465 curl_easy_setopt(state->curl, CURLOPT_PRIVATE, (void *)state);
466 curl_easy_setopt(state->curl, CURLOPT_AUTOREFERER, 1);
467 curl_easy_setopt(state->curl, CURLOPT_FOLLOWLOCATION, 1);
468 curl_easy_setopt(state->curl, CURLOPT_NOSIGNAL, 1);
469 curl_easy_setopt(state->curl, CURLOPT_ERRORBUFFER, state->errmsg);
470 curl_easy_setopt(state->curl, CURLOPT_FAILONERROR, 1);
471
472 if (s->username) {
473 curl_easy_setopt(state->curl, CURLOPT_USERNAME, s->username);
474 }
475 if (s->password) {
476 curl_easy_setopt(state->curl, CURLOPT_PASSWORD, s->password);
477 }
478 if (s->proxyusername) {
479 curl_easy_setopt(state->curl,
480 CURLOPT_PROXYUSERNAME, s->proxyusername);
481 }
482 if (s->proxypassword) {
483 curl_easy_setopt(state->curl,
484 CURLOPT_PROXYPASSWORD, s->proxypassword);
485 }
486
487
488
489
490
491
492
493#if LIBCURL_VERSION_NUM >= 0x071304
494 curl_easy_setopt(state->curl, CURLOPT_PROTOCOLS, PROTOCOLS);
495 curl_easy_setopt(state->curl, CURLOPT_REDIR_PROTOCOLS, PROTOCOLS);
496#endif
497
498#ifdef DEBUG_VERBOSE
499 curl_easy_setopt(state->curl, CURLOPT_VERBOSE, 1);
500#endif
501 }
502
503 QLIST_INIT(&state->sockets);
504 state->s = s;
505
506 return 0;
507}
508
509
510static void curl_clean_state(CURLState *s)
511{
512 int j;
513 for (j = 0; j < CURL_NUM_ACB; j++) {
514 assert(!s->acb[j]);
515 }
516
517 if (s->s->multi)
518 curl_multi_remove_handle(s->s->multi, s->curl);
519
520 while (!QLIST_EMPTY(&s->sockets)) {
521 CURLSocket *socket = QLIST_FIRST(&s->sockets);
522
523 QLIST_REMOVE(socket, next);
524 g_free(socket);
525 }
526
527 s->in_use = 0;
528
529 qemu_co_enter_next(&s->s->free_state_waitq, &s->s->mutex);
530}
531
532static void curl_parse_filename(const char *filename, QDict *options,
533 Error **errp)
534{
535 qdict_put_str(options, CURL_BLOCK_OPT_URL, filename);
536}
537
538static void curl_detach_aio_context(BlockDriverState *bs)
539{
540 BDRVCURLState *s = bs->opaque;
541 int i;
542
543 qemu_mutex_lock(&s->mutex);
544 for (i = 0; i < CURL_NUM_STATES; i++) {
545 if (s->states[i].in_use) {
546 curl_clean_state(&s->states[i]);
547 }
548 if (s->states[i].curl) {
549 curl_easy_cleanup(s->states[i].curl);
550 s->states[i].curl = NULL;
551 }
552 g_free(s->states[i].orig_buf);
553 s->states[i].orig_buf = NULL;
554 }
555 if (s->multi) {
556 curl_multi_cleanup(s->multi);
557 s->multi = NULL;
558 }
559 qemu_mutex_unlock(&s->mutex);
560
561 timer_del(&s->timer);
562}
563
564static void curl_attach_aio_context(BlockDriverState *bs,
565 AioContext *new_context)
566{
567 BDRVCURLState *s = bs->opaque;
568
569 aio_timer_init(new_context, &s->timer,
570 QEMU_CLOCK_REALTIME, SCALE_NS,
571 curl_multi_timeout_do, s);
572
573 assert(!s->multi);
574 s->multi = curl_multi_init();
575 s->aio_context = new_context;
576 curl_multi_setopt(s->multi, CURLMOPT_SOCKETFUNCTION, curl_sock_cb);
577#ifdef NEED_CURL_TIMER_CALLBACK
578 curl_multi_setopt(s->multi, CURLMOPT_TIMERDATA, s);
579 curl_multi_setopt(s->multi, CURLMOPT_TIMERFUNCTION, curl_timer_cb);
580#endif
581}
582
583static QemuOptsList runtime_opts = {
584 .name = "curl",
585 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
586 .desc = {
587 {
588 .name = CURL_BLOCK_OPT_URL,
589 .type = QEMU_OPT_STRING,
590 .help = "URL to open",
591 },
592 {
593 .name = CURL_BLOCK_OPT_READAHEAD,
594 .type = QEMU_OPT_SIZE,
595 .help = "Readahead size",
596 },
597 {
598 .name = CURL_BLOCK_OPT_SSLVERIFY,
599 .type = QEMU_OPT_BOOL,
600 .help = "Verify SSL certificate"
601 },
602 {
603 .name = CURL_BLOCK_OPT_TIMEOUT,
604 .type = QEMU_OPT_NUMBER,
605 .help = "Curl timeout"
606 },
607 {
608 .name = CURL_BLOCK_OPT_COOKIE,
609 .type = QEMU_OPT_STRING,
610 .help = "Pass the cookie or list of cookies with each request"
611 },
612 {
613 .name = CURL_BLOCK_OPT_COOKIE_SECRET,
614 .type = QEMU_OPT_STRING,
615 .help = "ID of secret used as cookie passed with each request"
616 },
617 {
618 .name = CURL_BLOCK_OPT_USERNAME,
619 .type = QEMU_OPT_STRING,
620 .help = "Username for HTTP auth"
621 },
622 {
623 .name = CURL_BLOCK_OPT_PASSWORD_SECRET,
624 .type = QEMU_OPT_STRING,
625 .help = "ID of secret used as password for HTTP auth",
626 },
627 {
628 .name = CURL_BLOCK_OPT_PROXY_USERNAME,
629 .type = QEMU_OPT_STRING,
630 .help = "Username for HTTP proxy auth"
631 },
632 {
633 .name = CURL_BLOCK_OPT_PROXY_PASSWORD_SECRET,
634 .type = QEMU_OPT_STRING,
635 .help = "ID of secret used as password for HTTP proxy auth",
636 },
637 { }
638 },
639};
640
641
642static int curl_open(BlockDriverState *bs, QDict *options, int flags,
643 Error **errp)
644{
645 BDRVCURLState *s = bs->opaque;
646 CURLState *state = NULL;
647 QemuOpts *opts;
648 Error *local_err = NULL;
649 const char *file;
650 const char *cookie;
651 const char *cookie_secret;
652 double d;
653 const char *secretid;
654 const char *protocol_delimiter;
655 int ret;
656
657 ret = bdrv_apply_auto_read_only(bs, "curl driver does not support writes",
658 errp);
659 if (ret < 0) {
660 return ret;
661 }
662
663 if (!libcurl_initialized) {
664 ret = curl_global_init(CURL_GLOBAL_ALL);
665 if (ret) {
666 error_setg(errp, "libcurl initialization failed with %d", ret);
667 return -EIO;
668 }
669 libcurl_initialized = true;
670 }
671
672 qemu_mutex_init(&s->mutex);
673 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
674 qemu_opts_absorb_qdict(opts, options, &local_err);
675 if (local_err) {
676 error_propagate(errp, local_err);
677 goto out_noclean;
678 }
679
680 s->readahead_size = qemu_opt_get_size(opts, CURL_BLOCK_OPT_READAHEAD,
681 CURL_BLOCK_OPT_READAHEAD_DEFAULT);
682 if ((s->readahead_size & 0x1ff) != 0) {
683 error_setg(errp, "HTTP_READAHEAD_SIZE %zd is not a multiple of 512",
684 s->readahead_size);
685 goto out_noclean;
686 }
687
688 s->timeout = qemu_opt_get_number(opts, CURL_BLOCK_OPT_TIMEOUT,
689 CURL_BLOCK_OPT_TIMEOUT_DEFAULT);
690 if (s->timeout > CURL_TIMEOUT_MAX) {
691 error_setg(errp, "timeout parameter is too large or negative");
692 goto out_noclean;
693 }
694
695 s->sslverify = qemu_opt_get_bool(opts, CURL_BLOCK_OPT_SSLVERIFY,
696 CURL_BLOCK_OPT_SSLVERIFY_DEFAULT);
697
698 cookie = qemu_opt_get(opts, CURL_BLOCK_OPT_COOKIE);
699 cookie_secret = qemu_opt_get(opts, CURL_BLOCK_OPT_COOKIE_SECRET);
700
701 if (cookie && cookie_secret) {
702 error_setg(errp,
703 "curl driver cannot handle both cookie and cookie secret");
704 goto out_noclean;
705 }
706
707 if (cookie_secret) {
708 s->cookie = qcrypto_secret_lookup_as_utf8(cookie_secret, errp);
709 if (!s->cookie) {
710 goto out_noclean;
711 }
712 } else {
713 s->cookie = g_strdup(cookie);
714 }
715
716 file = qemu_opt_get(opts, CURL_BLOCK_OPT_URL);
717 if (file == NULL) {
718 error_setg(errp, "curl block driver requires an 'url' option");
719 goto out_noclean;
720 }
721
722 if (!strstart(file, bs->drv->protocol_name, &protocol_delimiter) ||
723 !strstart(protocol_delimiter, "://", NULL))
724 {
725 error_setg(errp, "%s curl driver cannot handle the URL '%s' (does not "
726 "start with '%s://')", bs->drv->protocol_name, file,
727 bs->drv->protocol_name);
728 goto out_noclean;
729 }
730
731 s->username = g_strdup(qemu_opt_get(opts, CURL_BLOCK_OPT_USERNAME));
732 secretid = qemu_opt_get(opts, CURL_BLOCK_OPT_PASSWORD_SECRET);
733
734 if (secretid) {
735 s->password = qcrypto_secret_lookup_as_utf8(secretid, errp);
736 if (!s->password) {
737 goto out_noclean;
738 }
739 }
740
741 s->proxyusername = g_strdup(
742 qemu_opt_get(opts, CURL_BLOCK_OPT_PROXY_USERNAME));
743 secretid = qemu_opt_get(opts, CURL_BLOCK_OPT_PROXY_PASSWORD_SECRET);
744 if (secretid) {
745 s->proxypassword = qcrypto_secret_lookup_as_utf8(secretid, errp);
746 if (!s->proxypassword) {
747 goto out_noclean;
748 }
749 }
750
751 trace_curl_open(file);
752 qemu_co_queue_init(&s->free_state_waitq);
753 s->aio_context = bdrv_get_aio_context(bs);
754 s->url = g_strdup(file);
755 qemu_mutex_lock(&s->mutex);
756 state = curl_find_state(s);
757 qemu_mutex_unlock(&s->mutex);
758 if (!state) {
759 goto out_noclean;
760 }
761
762
763
764 if (curl_init_state(s, state) < 0) {
765 goto out;
766 }
767
768 s->accept_range = false;
769 curl_easy_setopt(state->curl, CURLOPT_NOBODY, 1);
770 curl_easy_setopt(state->curl, CURLOPT_HEADERFUNCTION,
771 curl_header_cb);
772 curl_easy_setopt(state->curl, CURLOPT_HEADERDATA, s);
773 if (curl_easy_perform(state->curl))
774 goto out;
775 if (curl_easy_getinfo(state->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &d)) {
776 goto out;
777 }
778
779
780
781#if LIBCURL_VERSION_NUM >= 0x071304
782 if (d < 0) {
783 pstrcpy(state->errmsg, CURL_ERROR_SIZE,
784 "Server didn't report file size.");
785 goto out;
786 }
787#else
788 if (d <= 0) {
789 pstrcpy(state->errmsg, CURL_ERROR_SIZE,
790 "Unknown file size or zero-length file.");
791 goto out;
792 }
793#endif
794
795 s->len = d;
796
797 if ((!strncasecmp(s->url, "http://", strlen("http://"))
798 || !strncasecmp(s->url, "https://", strlen("https://")))
799 && !s->accept_range) {
800 pstrcpy(state->errmsg, CURL_ERROR_SIZE,
801 "Server does not support 'range' (byte ranges).");
802 goto out;
803 }
804 trace_curl_open_size(s->len);
805
806 qemu_mutex_lock(&s->mutex);
807 curl_clean_state(state);
808 qemu_mutex_unlock(&s->mutex);
809 curl_easy_cleanup(state->curl);
810 state->curl = NULL;
811
812 curl_attach_aio_context(bs, bdrv_get_aio_context(bs));
813
814 qemu_opts_del(opts);
815 return 0;
816
817out:
818 error_setg(errp, "CURL: Error opening file: %s", state->errmsg);
819 curl_easy_cleanup(state->curl);
820 state->curl = NULL;
821out_noclean:
822 qemu_mutex_destroy(&s->mutex);
823 g_free(s->cookie);
824 g_free(s->url);
825 g_free(s->username);
826 g_free(s->proxyusername);
827 g_free(s->proxypassword);
828 qemu_opts_del(opts);
829 return -EINVAL;
830}
831
832static void curl_setup_preadv(BlockDriverState *bs, CURLAIOCB *acb)
833{
834 CURLState *state;
835 int running;
836
837 BDRVCURLState *s = bs->opaque;
838
839 uint64_t start = acb->offset;
840 uint64_t end;
841
842 qemu_mutex_lock(&s->mutex);
843
844
845
846 if (curl_find_buf(s, start, acb->bytes, acb)) {
847 goto out;
848 }
849
850
851 for (;;) {
852 state = curl_find_state(s);
853 if (state) {
854 break;
855 }
856 qemu_co_queue_wait(&s->free_state_waitq, &s->mutex);
857 }
858
859 if (curl_init_state(s, state) < 0) {
860 curl_clean_state(state);
861 acb->ret = -EIO;
862 goto out;
863 }
864
865 acb->start = 0;
866 acb->end = MIN(acb->bytes, s->len - start);
867
868 state->buf_off = 0;
869 g_free(state->orig_buf);
870 state->buf_start = start;
871 state->buf_len = MIN(acb->end + s->readahead_size, s->len - start);
872 end = start + state->buf_len - 1;
873 state->orig_buf = g_try_malloc(state->buf_len);
874 if (state->buf_len && state->orig_buf == NULL) {
875 curl_clean_state(state);
876 acb->ret = -ENOMEM;
877 goto out;
878 }
879 state->acb[0] = acb;
880
881 snprintf(state->range, 127, "%" PRIu64 "-%" PRIu64, start, end);
882 trace_curl_setup_preadv(acb->bytes, start, state->range);
883 curl_easy_setopt(state->curl, CURLOPT_RANGE, state->range);
884
885 curl_multi_add_handle(s->multi, state->curl);
886
887
888 curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running);
889
890out:
891 qemu_mutex_unlock(&s->mutex);
892}
893
894static int coroutine_fn curl_co_preadv(BlockDriverState *bs,
895 uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags)
896{
897 CURLAIOCB acb = {
898 .co = qemu_coroutine_self(),
899 .ret = -EINPROGRESS,
900 .qiov = qiov,
901 .offset = offset,
902 .bytes = bytes
903 };
904
905 curl_setup_preadv(bs, &acb);
906 while (acb.ret == -EINPROGRESS) {
907 qemu_coroutine_yield();
908 }
909 return acb.ret;
910}
911
912static void curl_close(BlockDriverState *bs)
913{
914 BDRVCURLState *s = bs->opaque;
915
916 trace_curl_close();
917 curl_detach_aio_context(bs);
918 qemu_mutex_destroy(&s->mutex);
919
920 g_free(s->cookie);
921 g_free(s->url);
922 g_free(s->username);
923 g_free(s->proxyusername);
924 g_free(s->proxypassword);
925}
926
927static int64_t curl_getlength(BlockDriverState *bs)
928{
929 BDRVCURLState *s = bs->opaque;
930 return s->len;
931}
932
933static void curl_refresh_filename(BlockDriverState *bs)
934{
935 BDRVCURLState *s = bs->opaque;
936
937
938
939 if (s->sslverify != CURL_BLOCK_OPT_SSLVERIFY_DEFAULT ||
940 s->cookie || s->username || s->password || s->proxyusername ||
941 s->proxypassword)
942 {
943 return;
944 }
945
946 pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), s->url);
947}
948
949
950static const char *const curl_strong_runtime_opts[] = {
951 CURL_BLOCK_OPT_URL,
952 CURL_BLOCK_OPT_SSLVERIFY,
953 CURL_BLOCK_OPT_COOKIE,
954 CURL_BLOCK_OPT_COOKIE_SECRET,
955 CURL_BLOCK_OPT_USERNAME,
956 CURL_BLOCK_OPT_PASSWORD_SECRET,
957 CURL_BLOCK_OPT_PROXY_USERNAME,
958 CURL_BLOCK_OPT_PROXY_PASSWORD_SECRET,
959
960 NULL
961};
962
963static BlockDriver bdrv_http = {
964 .format_name = "http",
965 .protocol_name = "http",
966
967 .instance_size = sizeof(BDRVCURLState),
968 .bdrv_parse_filename = curl_parse_filename,
969 .bdrv_file_open = curl_open,
970 .bdrv_close = curl_close,
971 .bdrv_getlength = curl_getlength,
972
973 .bdrv_co_preadv = curl_co_preadv,
974
975 .bdrv_detach_aio_context = curl_detach_aio_context,
976 .bdrv_attach_aio_context = curl_attach_aio_context,
977
978 .bdrv_refresh_filename = curl_refresh_filename,
979 .strong_runtime_opts = curl_strong_runtime_opts,
980};
981
982static BlockDriver bdrv_https = {
983 .format_name = "https",
984 .protocol_name = "https",
985
986 .instance_size = sizeof(BDRVCURLState),
987 .bdrv_parse_filename = curl_parse_filename,
988 .bdrv_file_open = curl_open,
989 .bdrv_close = curl_close,
990 .bdrv_getlength = curl_getlength,
991
992 .bdrv_co_preadv = curl_co_preadv,
993
994 .bdrv_detach_aio_context = curl_detach_aio_context,
995 .bdrv_attach_aio_context = curl_attach_aio_context,
996
997 .bdrv_refresh_filename = curl_refresh_filename,
998 .strong_runtime_opts = curl_strong_runtime_opts,
999};
1000
1001static BlockDriver bdrv_ftp = {
1002 .format_name = "ftp",
1003 .protocol_name = "ftp",
1004
1005 .instance_size = sizeof(BDRVCURLState),
1006 .bdrv_parse_filename = curl_parse_filename,
1007 .bdrv_file_open = curl_open,
1008 .bdrv_close = curl_close,
1009 .bdrv_getlength = curl_getlength,
1010
1011 .bdrv_co_preadv = curl_co_preadv,
1012
1013 .bdrv_detach_aio_context = curl_detach_aio_context,
1014 .bdrv_attach_aio_context = curl_attach_aio_context,
1015
1016 .bdrv_refresh_filename = curl_refresh_filename,
1017 .strong_runtime_opts = curl_strong_runtime_opts,
1018};
1019
1020static BlockDriver bdrv_ftps = {
1021 .format_name = "ftps",
1022 .protocol_name = "ftps",
1023
1024 .instance_size = sizeof(BDRVCURLState),
1025 .bdrv_parse_filename = curl_parse_filename,
1026 .bdrv_file_open = curl_open,
1027 .bdrv_close = curl_close,
1028 .bdrv_getlength = curl_getlength,
1029
1030 .bdrv_co_preadv = curl_co_preadv,
1031
1032 .bdrv_detach_aio_context = curl_detach_aio_context,
1033 .bdrv_attach_aio_context = curl_attach_aio_context,
1034
1035 .bdrv_refresh_filename = curl_refresh_filename,
1036 .strong_runtime_opts = curl_strong_runtime_opts,
1037};
1038
1039static void curl_block_init(void)
1040{
1041 bdrv_register(&bdrv_http);
1042 bdrv_register(&bdrv_https);
1043 bdrv_register(&bdrv_ftp);
1044 bdrv_register(&bdrv_ftps);
1045}
1046
1047block_init(curl_block_init);
1048