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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#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
62struct BDRVCURLState;
63struct CURLState;
64
65static bool libcurl_initialized;
66
67typedef 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
79typedef struct CURLSocket {
80 int fd;
81 struct BDRVCURLState *s;
82} CURLSocket;
83
84typedef 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
98typedef struct BDRVCURLState {
99 CURLM *multi;
100 QEMUTimer timer;
101 uint64_t len;
102 CURLState states[CURL_NUM_STATES];
103 GHashTable *sockets;
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
119static void curl_clean_state(CURLState *s);
120static void curl_multi_do(void *arg);
121
122static 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);
129 return true;
130}
131
132static void curl_drop_all_sockets(GHashTable *sockets)
133{
134 g_hash_table_foreach_remove(sockets, curl_drop_socket, NULL);
135}
136
137
138static 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
154static 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, socket);
177 break;
178 case CURL_POLL_OUT:
179 aio_set_fd_handler(s->aio_context, fd, false,
180 NULL, curl_multi_do, 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, NULL, socket);
185 break;
186 case CURL_POLL_REMOVE:
187 aio_set_fd_handler(s->aio_context, fd, false,
188 NULL, NULL, NULL, NULL);
189 break;
190 }
191
192 if (action == CURL_POLL_REMOVE) {
193 g_hash_table_remove(s->sockets, GINT_TO_POINTER(fd));
194 }
195
196 return 0;
197}
198
199
200static size_t curl_header_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
201{
202 BDRVCURLState *s = opaque;
203 size_t realsize = size * nmemb;
204 const char *header = (char *)ptr;
205 const char *end = header + realsize;
206 const char *accept_ranges = "accept-ranges:";
207 const char *bytes = "bytes";
208
209 if (realsize >= strlen(accept_ranges)
210 && g_ascii_strncasecmp(header, accept_ranges,
211 strlen(accept_ranges)) == 0) {
212
213 char *p = strchr(header, ':') + 1;
214
215
216 while (p < end && *p && g_ascii_isspace(*p)) {
217 p++;
218 }
219
220 if (end - p >= strlen(bytes)
221 && strncmp(p, bytes, strlen(bytes)) == 0) {
222
223
224 p += strlen(bytes);
225 while (p < end && *p && g_ascii_isspace(*p)) {
226 p++;
227 }
228
229 if (p == end || !*p) {
230 s->accept_range = true;
231 }
232 }
233 }
234
235 return realsize;
236}
237
238
239static size_t curl_read_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
240{
241 CURLState *s = ((CURLState*)opaque);
242 size_t realsize = size * nmemb;
243
244 trace_curl_read_cb(realsize);
245
246 if (!s || !s->orig_buf) {
247 goto read_end;
248 }
249
250 if (s->buf_off >= s->buf_len) {
251
252 goto read_end;
253 }
254 realsize = MIN(realsize, s->buf_len - s->buf_off);
255 memcpy(s->orig_buf + s->buf_off, ptr, realsize);
256 s->buf_off += realsize;
257
258read_end:
259
260 return size * nmemb;
261}
262
263
264static bool curl_find_buf(BDRVCURLState *s, uint64_t start, uint64_t len,
265 CURLAIOCB *acb)
266{
267 int i;
268 uint64_t end = start + len;
269 uint64_t clamped_end = MIN(end, s->len);
270 uint64_t clamped_len = clamped_end - start;
271
272 for (i=0; i<CURL_NUM_STATES; i++) {
273 CURLState *state = &s->states[i];
274 uint64_t buf_end = (state->buf_start + state->buf_off);
275 uint64_t buf_fend = (state->buf_start + state->buf_len);
276
277 if (!state->orig_buf)
278 continue;
279 if (!state->buf_off)
280 continue;
281
282
283 if ((start >= state->buf_start) &&
284 (start <= buf_end) &&
285 (clamped_end >= state->buf_start) &&
286 (clamped_end <= buf_end))
287 {
288 char *buf = state->orig_buf + (start - state->buf_start);
289
290 qemu_iovec_from_buf(acb->qiov, 0, buf, clamped_len);
291 if (clamped_len < len) {
292 qemu_iovec_memset(acb->qiov, clamped_len, 0, len - clamped_len);
293 }
294 acb->ret = 0;
295 return true;
296 }
297
298
299 if (state->in_use &&
300 (start >= state->buf_start) &&
301 (start <= buf_fend) &&
302 (clamped_end >= state->buf_start) &&
303 (clamped_end <= buf_fend))
304 {
305 int j;
306
307 acb->start = start - state->buf_start;
308 acb->end = acb->start + clamped_len;
309
310 for (j=0; j<CURL_NUM_ACB; j++) {
311 if (!state->acb[j]) {
312 state->acb[j] = acb;
313 return true;
314 }
315 }
316 }
317 }
318
319 return false;
320}
321
322
323static void curl_multi_check_completion(BDRVCURLState *s)
324{
325 int msgs_in_queue;
326
327
328
329 for (;;) {
330 CURLMsg *msg;
331 msg = curl_multi_info_read(s->multi, &msgs_in_queue);
332
333
334 if (!msg)
335 break;
336
337 if (msg->msg == CURLMSG_DONE) {
338 int i;
339 CURLState *state = NULL;
340 bool error = msg->data.result != CURLE_OK;
341
342 curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE,
343 (char **)&state);
344
345 if (error) {
346 static int errcount = 100;
347
348
349
350
351 if (errcount > 0) {
352 error_report("curl: %s", state->errmsg);
353 if (--errcount == 0) {
354 error_report("curl: further errors suppressed");
355 }
356 }
357 }
358
359 for (i = 0; i < CURL_NUM_ACB; i++) {
360 CURLAIOCB *acb = state->acb[i];
361
362 if (acb == NULL) {
363 continue;
364 }
365
366 if (!error) {
367
368 assert(state->buf_off >= acb->end);
369
370 qemu_iovec_from_buf(acb->qiov, 0,
371 state->orig_buf + acb->start,
372 acb->end - acb->start);
373
374 if (acb->end - acb->start < acb->bytes) {
375 size_t offset = acb->end - acb->start;
376 qemu_iovec_memset(acb->qiov, offset, 0,
377 acb->bytes - offset);
378 }
379 }
380
381 acb->ret = error ? -EIO : 0;
382 state->acb[i] = NULL;
383 qemu_mutex_unlock(&s->mutex);
384 aio_co_wake(acb->co);
385 qemu_mutex_lock(&s->mutex);
386 }
387
388 curl_clean_state(state);
389 break;
390 }
391 }
392}
393
394
395static void curl_multi_do_locked(CURLSocket *socket)
396{
397 BDRVCURLState *s = socket->s;
398 int running;
399 int r;
400
401 if (!s->multi) {
402 return;
403 }
404
405 do {
406 r = curl_multi_socket_action(s->multi, socket->fd, 0, &running);
407 } while (r == CURLM_CALL_MULTI_PERFORM);
408}
409
410static void curl_multi_do(void *arg)
411{
412 CURLSocket *socket = arg;
413 BDRVCURLState *s = socket->s;
414
415 qemu_mutex_lock(&s->mutex);
416 curl_multi_do_locked(socket);
417 curl_multi_check_completion(s);
418 qemu_mutex_unlock(&s->mutex);
419}
420
421static void curl_multi_timeout_do(void *arg)
422{
423 BDRVCURLState *s = (BDRVCURLState *)arg;
424 int running;
425
426 if (!s->multi) {
427 return;
428 }
429
430 qemu_mutex_lock(&s->mutex);
431 curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running);
432
433 curl_multi_check_completion(s);
434 qemu_mutex_unlock(&s->mutex);
435}
436
437
438static CURLState *curl_find_state(BDRVCURLState *s)
439{
440 CURLState *state = NULL;
441 int i;
442
443 for (i = 0; i < CURL_NUM_STATES; i++) {
444 if (!s->states[i].in_use) {
445 state = &s->states[i];
446 state->in_use = 1;
447 break;
448 }
449 }
450 return state;
451}
452
453static int curl_init_state(BDRVCURLState *s, CURLState *state)
454{
455 if (!state->curl) {
456 state->curl = curl_easy_init();
457 if (!state->curl) {
458 return -EIO;
459 }
460 curl_easy_setopt(state->curl, CURLOPT_URL, s->url);
461 curl_easy_setopt(state->curl, CURLOPT_SSL_VERIFYPEER,
462 (long) s->sslverify);
463 curl_easy_setopt(state->curl, CURLOPT_SSL_VERIFYHOST,
464 s->sslverify ? 2L : 0L);
465 if (s->cookie) {
466 curl_easy_setopt(state->curl, CURLOPT_COOKIE, s->cookie);
467 }
468 curl_easy_setopt(state->curl, CURLOPT_TIMEOUT, (long)s->timeout);
469 curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION,
470 (void *)curl_read_cb);
471 curl_easy_setopt(state->curl, CURLOPT_WRITEDATA, (void *)state);
472 curl_easy_setopt(state->curl, CURLOPT_PRIVATE, (void *)state);
473 curl_easy_setopt(state->curl, CURLOPT_AUTOREFERER, 1);
474 curl_easy_setopt(state->curl, CURLOPT_FOLLOWLOCATION, 1);
475 curl_easy_setopt(state->curl, CURLOPT_NOSIGNAL, 1);
476 curl_easy_setopt(state->curl, CURLOPT_ERRORBUFFER, state->errmsg);
477 curl_easy_setopt(state->curl, CURLOPT_FAILONERROR, 1);
478
479 if (s->username) {
480 curl_easy_setopt(state->curl, CURLOPT_USERNAME, s->username);
481 }
482 if (s->password) {
483 curl_easy_setopt(state->curl, CURLOPT_PASSWORD, s->password);
484 }
485 if (s->proxyusername) {
486 curl_easy_setopt(state->curl,
487 CURLOPT_PROXYUSERNAME, s->proxyusername);
488 }
489 if (s->proxypassword) {
490 curl_easy_setopt(state->curl,
491 CURLOPT_PROXYPASSWORD, s->proxypassword);
492 }
493
494
495
496
497
498
499
500#if LIBCURL_VERSION_NUM >= 0x071304
501 curl_easy_setopt(state->curl, CURLOPT_PROTOCOLS, PROTOCOLS);
502 curl_easy_setopt(state->curl, CURLOPT_REDIR_PROTOCOLS, PROTOCOLS);
503#endif
504
505#ifdef DEBUG_VERBOSE
506 curl_easy_setopt(state->curl, CURLOPT_VERBOSE, 1);
507#endif
508 }
509
510 state->s = s;
511
512 return 0;
513}
514
515
516static void curl_clean_state(CURLState *s)
517{
518 int j;
519 for (j = 0; j < CURL_NUM_ACB; j++) {
520 assert(!s->acb[j]);
521 }
522
523 if (s->s->multi)
524 curl_multi_remove_handle(s->s->multi, s->curl);
525
526 s->in_use = 0;
527
528 qemu_co_enter_next(&s->s->free_state_waitq, &s->s->mutex);
529}
530
531static void curl_parse_filename(const char *filename, QDict *options,
532 Error **errp)
533{
534 qdict_put_str(options, CURL_BLOCK_OPT_URL, filename);
535}
536
537static void curl_detach_aio_context(BlockDriverState *bs)
538{
539 BDRVCURLState *s = bs->opaque;
540 int i;
541
542 WITH_QEMU_LOCK_GUARD(&s->mutex) {
543 curl_drop_all_sockets(s->sockets);
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 }
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 curl_multi_setopt(s->multi, CURLMOPT_TIMERDATA, s);
578 curl_multi_setopt(s->multi, CURLMOPT_TIMERFUNCTION, curl_timer_cb);
579}
580
581static QemuOptsList runtime_opts = {
582 .name = "curl",
583 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
584 .desc = {
585 {
586 .name = CURL_BLOCK_OPT_URL,
587 .type = QEMU_OPT_STRING,
588 .help = "URL to open",
589 },
590 {
591 .name = CURL_BLOCK_OPT_READAHEAD,
592 .type = QEMU_OPT_SIZE,
593 .help = "Readahead size",
594 },
595 {
596 .name = CURL_BLOCK_OPT_SSLVERIFY,
597 .type = QEMU_OPT_BOOL,
598 .help = "Verify SSL certificate"
599 },
600 {
601 .name = CURL_BLOCK_OPT_TIMEOUT,
602 .type = QEMU_OPT_NUMBER,
603 .help = "Curl timeout"
604 },
605 {
606 .name = CURL_BLOCK_OPT_COOKIE,
607 .type = QEMU_OPT_STRING,
608 .help = "Pass the cookie or list of cookies with each request"
609 },
610 {
611 .name = CURL_BLOCK_OPT_COOKIE_SECRET,
612 .type = QEMU_OPT_STRING,
613 .help = "ID of secret used as cookie passed with each request"
614 },
615 {
616 .name = CURL_BLOCK_OPT_USERNAME,
617 .type = QEMU_OPT_STRING,
618 .help = "Username for HTTP auth"
619 },
620 {
621 .name = CURL_BLOCK_OPT_PASSWORD_SECRET,
622 .type = QEMU_OPT_STRING,
623 .help = "ID of secret used as password for HTTP auth",
624 },
625 {
626 .name = CURL_BLOCK_OPT_PROXY_USERNAME,
627 .type = QEMU_OPT_STRING,
628 .help = "Username for HTTP proxy auth"
629 },
630 {
631 .name = CURL_BLOCK_OPT_PROXY_PASSWORD_SECRET,
632 .type = QEMU_OPT_STRING,
633 .help = "ID of secret used as password for HTTP proxy auth",
634 },
635 { }
636 },
637};
638
639
640static int curl_open(BlockDriverState *bs, QDict *options, int flags,
641 Error **errp)
642{
643 BDRVCURLState *s = bs->opaque;
644 CURLState *state = NULL;
645 QemuOpts *opts;
646 const char *file;
647 const char *cookie;
648 const char *cookie_secret;
649 double d;
650 const char *secretid;
651 const char *protocol_delimiter;
652 int ret;
653
654 ret = bdrv_apply_auto_read_only(bs, "curl driver does not support writes",
655 errp);
656 if (ret < 0) {
657 return ret;
658 }
659
660 if (!libcurl_initialized) {
661 ret = curl_global_init(CURL_GLOBAL_ALL);
662 if (ret) {
663 error_setg(errp, "libcurl initialization failed with %d", ret);
664 return -EIO;
665 }
666 libcurl_initialized = true;
667 }
668
669 qemu_mutex_init(&s->mutex);
670 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
671 if (!qemu_opts_absorb_qdict(opts, options, errp)) {
672 goto out_noclean;
673 }
674
675 s->readahead_size = qemu_opt_get_size(opts, CURL_BLOCK_OPT_READAHEAD,
676 CURL_BLOCK_OPT_READAHEAD_DEFAULT);
677 if ((s->readahead_size & 0x1ff) != 0) {
678 error_setg(errp, "HTTP_READAHEAD_SIZE %zd is not a multiple of 512",
679 s->readahead_size);
680 goto out_noclean;
681 }
682
683 s->timeout = qemu_opt_get_number(opts, CURL_BLOCK_OPT_TIMEOUT,
684 CURL_BLOCK_OPT_TIMEOUT_DEFAULT);
685 if (s->timeout > CURL_TIMEOUT_MAX) {
686 error_setg(errp, "timeout parameter is too large or negative");
687 goto out_noclean;
688 }
689
690 s->sslverify = qemu_opt_get_bool(opts, CURL_BLOCK_OPT_SSLVERIFY,
691 CURL_BLOCK_OPT_SSLVERIFY_DEFAULT);
692
693 cookie = qemu_opt_get(opts, CURL_BLOCK_OPT_COOKIE);
694 cookie_secret = qemu_opt_get(opts, CURL_BLOCK_OPT_COOKIE_SECRET);
695
696 if (cookie && cookie_secret) {
697 error_setg(errp,
698 "curl driver cannot handle both cookie and cookie secret");
699 goto out_noclean;
700 }
701
702 if (cookie_secret) {
703 s->cookie = qcrypto_secret_lookup_as_utf8(cookie_secret, errp);
704 if (!s->cookie) {
705 goto out_noclean;
706 }
707 } else {
708 s->cookie = g_strdup(cookie);
709 }
710
711 file = qemu_opt_get(opts, CURL_BLOCK_OPT_URL);
712 if (file == NULL) {
713 error_setg(errp, "curl block driver requires an 'url' option");
714 goto out_noclean;
715 }
716
717 if (!strstart(file, bs->drv->protocol_name, &protocol_delimiter) ||
718 !strstart(protocol_delimiter, "://", NULL))
719 {
720 error_setg(errp, "%s curl driver cannot handle the URL '%s' (does not "
721 "start with '%s://')", bs->drv->protocol_name, file,
722 bs->drv->protocol_name);
723 goto out_noclean;
724 }
725
726 s->username = g_strdup(qemu_opt_get(opts, CURL_BLOCK_OPT_USERNAME));
727 secretid = qemu_opt_get(opts, CURL_BLOCK_OPT_PASSWORD_SECRET);
728
729 if (secretid) {
730 s->password = qcrypto_secret_lookup_as_utf8(secretid, errp);
731 if (!s->password) {
732 goto out_noclean;
733 }
734 }
735
736 s->proxyusername = g_strdup(
737 qemu_opt_get(opts, CURL_BLOCK_OPT_PROXY_USERNAME));
738 secretid = qemu_opt_get(opts, CURL_BLOCK_OPT_PROXY_PASSWORD_SECRET);
739 if (secretid) {
740 s->proxypassword = qcrypto_secret_lookup_as_utf8(secretid, errp);
741 if (!s->proxypassword) {
742 goto out_noclean;
743 }
744 }
745
746 trace_curl_open(file);
747 qemu_co_queue_init(&s->free_state_waitq);
748 s->aio_context = bdrv_get_aio_context(bs);
749 s->url = g_strdup(file);
750 s->sockets = g_hash_table_new_full(NULL, NULL, NULL, g_free);
751 qemu_mutex_lock(&s->mutex);
752 state = curl_find_state(s);
753 qemu_mutex_unlock(&s->mutex);
754 if (!state) {
755 goto out_noclean;
756 }
757
758
759
760 if (curl_init_state(s, state) < 0) {
761 goto out;
762 }
763
764 s->accept_range = false;
765 curl_easy_setopt(state->curl, CURLOPT_NOBODY, 1);
766 curl_easy_setopt(state->curl, CURLOPT_HEADERFUNCTION,
767 curl_header_cb);
768 curl_easy_setopt(state->curl, CURLOPT_HEADERDATA, s);
769 if (curl_easy_perform(state->curl))
770 goto out;
771 if (curl_easy_getinfo(state->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &d)) {
772 goto out;
773 }
774
775
776
777#if LIBCURL_VERSION_NUM >= 0x071304
778 if (d < 0) {
779 pstrcpy(state->errmsg, CURL_ERROR_SIZE,
780 "Server didn't report file size.");
781 goto out;
782 }
783#else
784 if (d <= 0) {
785 pstrcpy(state->errmsg, CURL_ERROR_SIZE,
786 "Unknown file size or zero-length file.");
787 goto out;
788 }
789#endif
790
791 s->len = d;
792
793 if ((!strncasecmp(s->url, "http://", strlen("http://"))
794 || !strncasecmp(s->url, "https://", strlen("https://")))
795 && !s->accept_range) {
796 pstrcpy(state->errmsg, CURL_ERROR_SIZE,
797 "Server does not support 'range' (byte ranges).");
798 goto out;
799 }
800 trace_curl_open_size(s->len);
801
802 qemu_mutex_lock(&s->mutex);
803 curl_clean_state(state);
804 qemu_mutex_unlock(&s->mutex);
805 curl_easy_cleanup(state->curl);
806 state->curl = NULL;
807
808 curl_attach_aio_context(bs, bdrv_get_aio_context(bs));
809
810 qemu_opts_del(opts);
811 return 0;
812
813out:
814 error_setg(errp, "CURL: Error opening file: %s", state->errmsg);
815 curl_easy_cleanup(state->curl);
816 state->curl = NULL;
817out_noclean:
818 qemu_mutex_destroy(&s->mutex);
819 g_free(s->cookie);
820 g_free(s->url);
821 g_free(s->username);
822 g_free(s->proxyusername);
823 g_free(s->proxypassword);
824 curl_drop_all_sockets(s->sockets);
825 g_hash_table_destroy(s->sockets);
826 qemu_opts_del(opts);
827 return -EINVAL;
828}
829
830static void curl_setup_preadv(BlockDriverState *bs, CURLAIOCB *acb)
831{
832 CURLState *state;
833 int running;
834
835 BDRVCURLState *s = bs->opaque;
836
837 uint64_t start = acb->offset;
838 uint64_t end;
839
840 qemu_mutex_lock(&s->mutex);
841
842
843
844 if (curl_find_buf(s, start, acb->bytes, acb)) {
845 goto out;
846 }
847
848
849 for (;;) {
850 state = curl_find_state(s);
851 if (state) {
852 break;
853 }
854 qemu_co_queue_wait(&s->free_state_waitq, &s->mutex);
855 }
856
857 if (curl_init_state(s, state) < 0) {
858 curl_clean_state(state);
859 acb->ret = -EIO;
860 goto out;
861 }
862
863 acb->start = 0;
864 acb->end = MIN(acb->bytes, s->len - start);
865
866 state->buf_off = 0;
867 g_free(state->orig_buf);
868 state->buf_start = start;
869 state->buf_len = MIN(acb->end + s->readahead_size, s->len - start);
870 end = start + state->buf_len - 1;
871 state->orig_buf = g_try_malloc(state->buf_len);
872 if (state->buf_len && state->orig_buf == NULL) {
873 curl_clean_state(state);
874 acb->ret = -ENOMEM;
875 goto out;
876 }
877 state->acb[0] = acb;
878
879 snprintf(state->range, 127, "%" PRIu64 "-%" PRIu64, start, end);
880 trace_curl_setup_preadv(acb->bytes, start, state->range);
881 curl_easy_setopt(state->curl, CURLOPT_RANGE, state->range);
882
883 if (curl_multi_add_handle(s->multi, state->curl) != CURLM_OK) {
884 state->acb[0] = NULL;
885 acb->ret = -EIO;
886
887 curl_clean_state(state);
888 goto out;
889 }
890
891
892 curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running);
893
894out:
895 qemu_mutex_unlock(&s->mutex);
896}
897
898static int coroutine_fn curl_co_preadv(BlockDriverState *bs,
899 uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags)
900{
901 CURLAIOCB acb = {
902 .co = qemu_coroutine_self(),
903 .ret = -EINPROGRESS,
904 .qiov = qiov,
905 .offset = offset,
906 .bytes = bytes
907 };
908
909 curl_setup_preadv(bs, &acb);
910 while (acb.ret == -EINPROGRESS) {
911 qemu_coroutine_yield();
912 }
913 return acb.ret;
914}
915
916static void curl_close(BlockDriverState *bs)
917{
918 BDRVCURLState *s = bs->opaque;
919
920 trace_curl_close();
921 curl_detach_aio_context(bs);
922 qemu_mutex_destroy(&s->mutex);
923
924 g_hash_table_destroy(s->sockets);
925 g_free(s->cookie);
926 g_free(s->url);
927 g_free(s->username);
928 g_free(s->proxyusername);
929 g_free(s->proxypassword);
930}
931
932static int64_t curl_getlength(BlockDriverState *bs)
933{
934 BDRVCURLState *s = bs->opaque;
935 return s->len;
936}
937
938static void curl_refresh_filename(BlockDriverState *bs)
939{
940 BDRVCURLState *s = bs->opaque;
941
942
943
944 if (s->sslverify != CURL_BLOCK_OPT_SSLVERIFY_DEFAULT ||
945 s->cookie || s->username || s->password || s->proxyusername ||
946 s->proxypassword)
947 {
948 return;
949 }
950
951 pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), s->url);
952}
953
954
955static const char *const curl_strong_runtime_opts[] = {
956 CURL_BLOCK_OPT_URL,
957 CURL_BLOCK_OPT_SSLVERIFY,
958 CURL_BLOCK_OPT_COOKIE,
959 CURL_BLOCK_OPT_COOKIE_SECRET,
960 CURL_BLOCK_OPT_USERNAME,
961 CURL_BLOCK_OPT_PASSWORD_SECRET,
962 CURL_BLOCK_OPT_PROXY_USERNAME,
963 CURL_BLOCK_OPT_PROXY_PASSWORD_SECRET,
964
965 NULL
966};
967
968static BlockDriver bdrv_http = {
969 .format_name = "http",
970 .protocol_name = "http",
971
972 .instance_size = sizeof(BDRVCURLState),
973 .bdrv_parse_filename = curl_parse_filename,
974 .bdrv_file_open = curl_open,
975 .bdrv_close = curl_close,
976 .bdrv_getlength = curl_getlength,
977
978 .bdrv_co_preadv = curl_co_preadv,
979
980 .bdrv_detach_aio_context = curl_detach_aio_context,
981 .bdrv_attach_aio_context = curl_attach_aio_context,
982
983 .bdrv_refresh_filename = curl_refresh_filename,
984 .strong_runtime_opts = curl_strong_runtime_opts,
985};
986
987static BlockDriver bdrv_https = {
988 .format_name = "https",
989 .protocol_name = "https",
990
991 .instance_size = sizeof(BDRVCURLState),
992 .bdrv_parse_filename = curl_parse_filename,
993 .bdrv_file_open = curl_open,
994 .bdrv_close = curl_close,
995 .bdrv_getlength = curl_getlength,
996
997 .bdrv_co_preadv = curl_co_preadv,
998
999 .bdrv_detach_aio_context = curl_detach_aio_context,
1000 .bdrv_attach_aio_context = curl_attach_aio_context,
1001
1002 .bdrv_refresh_filename = curl_refresh_filename,
1003 .strong_runtime_opts = curl_strong_runtime_opts,
1004};
1005
1006static BlockDriver bdrv_ftp = {
1007 .format_name = "ftp",
1008 .protocol_name = "ftp",
1009
1010 .instance_size = sizeof(BDRVCURLState),
1011 .bdrv_parse_filename = curl_parse_filename,
1012 .bdrv_file_open = curl_open,
1013 .bdrv_close = curl_close,
1014 .bdrv_getlength = curl_getlength,
1015
1016 .bdrv_co_preadv = curl_co_preadv,
1017
1018 .bdrv_detach_aio_context = curl_detach_aio_context,
1019 .bdrv_attach_aio_context = curl_attach_aio_context,
1020
1021 .bdrv_refresh_filename = curl_refresh_filename,
1022 .strong_runtime_opts = curl_strong_runtime_opts,
1023};
1024
1025static BlockDriver bdrv_ftps = {
1026 .format_name = "ftps",
1027 .protocol_name = "ftps",
1028
1029 .instance_size = sizeof(BDRVCURLState),
1030 .bdrv_parse_filename = curl_parse_filename,
1031 .bdrv_file_open = curl_open,
1032 .bdrv_close = curl_close,
1033 .bdrv_getlength = curl_getlength,
1034
1035 .bdrv_co_preadv = curl_co_preadv,
1036
1037 .bdrv_detach_aio_context = curl_detach_aio_context,
1038 .bdrv_attach_aio_context = curl_attach_aio_context,
1039
1040 .bdrv_refresh_filename = curl_refresh_filename,
1041 .strong_runtime_opts = curl_strong_runtime_opts,
1042};
1043
1044static void curl_block_init(void)
1045{
1046 bdrv_register(&bdrv_http);
1047 bdrv_register(&bdrv_https);
1048 bdrv_register(&bdrv_ftp);
1049 bdrv_register(&bdrv_ftps);
1050}
1051
1052block_init(curl_block_init);
1053