xref: /openbmc/qemu/block/curl.c (revision 3257fc83)
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
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 
67 #define FIND_RET_NONE   0
68 #define FIND_RET_OK     1
69 #define FIND_RET_WAIT   2
70 
71 #define CURL_BLOCK_OPT_URL       "url"
72 #define CURL_BLOCK_OPT_READAHEAD "readahead"
73 #define CURL_BLOCK_OPT_SSLVERIFY "sslverify"
74 
75 struct BDRVCURLState;
76 
77 typedef struct CURLAIOCB {
78     BlockDriverAIOCB common;
79     QEMUBH *bh;
80     QEMUIOVector *qiov;
81 
82     int64_t sector_num;
83     int nb_sectors;
84 
85     size_t start;
86     size_t end;
87 } CURLAIOCB;
88 
89 typedef struct CURLState
90 {
91     struct BDRVCURLState *s;
92     CURLAIOCB *acb[CURL_NUM_ACB];
93     CURL *curl;
94     curl_socket_t sock_fd;
95     char *orig_buf;
96     size_t buf_start;
97     size_t buf_off;
98     size_t buf_len;
99     char range[128];
100     char errmsg[CURL_ERROR_SIZE];
101     char in_use;
102 } CURLState;
103 
104 typedef struct BDRVCURLState {
105     CURLM *multi;
106     QEMUTimer timer;
107     size_t len;
108     CURLState states[CURL_NUM_STATES];
109     char *url;
110     size_t readahead_size;
111     bool sslverify;
112     bool accept_range;
113 } BDRVCURLState;
114 
115 static void curl_clean_state(CURLState *s);
116 static void curl_multi_do(void *arg);
117 static void curl_multi_read(void *arg);
118 
119 #ifdef NEED_CURL_TIMER_CALLBACK
120 static int curl_timer_cb(CURLM *multi, long timeout_ms, void *opaque)
121 {
122     BDRVCURLState *s = opaque;
123 
124     DPRINTF("CURL: timer callback timeout_ms %ld\n", timeout_ms);
125     if (timeout_ms == -1) {
126         timer_del(&s->timer);
127     } else {
128         int64_t timeout_ns = (int64_t)timeout_ms * 1000 * 1000;
129         timer_mod(&s->timer,
130                   qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + timeout_ns);
131     }
132     return 0;
133 }
134 #endif
135 
136 static int curl_sock_cb(CURL *curl, curl_socket_t fd, int action,
137                         void *s, void *sp)
138 {
139     CURLState *state = NULL;
140     curl_easy_getinfo(curl, CURLINFO_PRIVATE, (char **)&state);
141     state->sock_fd = fd;
142 
143     DPRINTF("CURL (AIO): Sock action %d on fd %d\n", action, fd);
144     switch (action) {
145         case CURL_POLL_IN:
146             qemu_aio_set_fd_handler(fd, curl_multi_read, NULL, state);
147             break;
148         case CURL_POLL_OUT:
149             qemu_aio_set_fd_handler(fd, NULL, curl_multi_do, state);
150             break;
151         case CURL_POLL_INOUT:
152             qemu_aio_set_fd_handler(fd, curl_multi_read, curl_multi_do, state);
153             break;
154         case CURL_POLL_REMOVE:
155             qemu_aio_set_fd_handler(fd, NULL, NULL, NULL);
156             break;
157     }
158 
159     return 0;
160 }
161 
162 static size_t curl_header_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
163 {
164     BDRVCURLState *s = opaque;
165     size_t realsize = size * nmemb;
166     const char *accept_line = "Accept-Ranges: bytes";
167 
168     if (realsize >= strlen(accept_line)
169         && strncmp((char *)ptr, accept_line, strlen(accept_line)) == 0) {
170         s->accept_range = true;
171     }
172 
173     return realsize;
174 }
175 
176 static size_t curl_read_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
177 {
178     CURLState *s = ((CURLState*)opaque);
179     size_t realsize = size * nmemb;
180     int i;
181 
182     DPRINTF("CURL: Just reading %zd bytes\n", realsize);
183 
184     if (!s || !s->orig_buf)
185         return 0;
186 
187     if (s->buf_off >= s->buf_len) {
188         /* buffer full, read nothing */
189         return 0;
190     }
191     realsize = MIN(realsize, s->buf_len - s->buf_off);
192     memcpy(s->orig_buf + s->buf_off, ptr, realsize);
193     s->buf_off += realsize;
194 
195     for(i=0; i<CURL_NUM_ACB; i++) {
196         CURLAIOCB *acb = s->acb[i];
197 
198         if (!acb)
199             continue;
200 
201         if ((s->buf_off >= acb->end)) {
202             qemu_iovec_from_buf(acb->qiov, 0, s->orig_buf + acb->start,
203                                 acb->end - acb->start);
204             acb->common.cb(acb->common.opaque, 0);
205             qemu_aio_release(acb);
206             s->acb[i] = NULL;
207         }
208     }
209 
210     return realsize;
211 }
212 
213 static int curl_find_buf(BDRVCURLState *s, size_t start, size_t len,
214                          CURLAIOCB *acb)
215 {
216     int i;
217     size_t end = start + len;
218 
219     for (i=0; i<CURL_NUM_STATES; i++) {
220         CURLState *state = &s->states[i];
221         size_t buf_end = (state->buf_start + state->buf_off);
222         size_t buf_fend = (state->buf_start + state->buf_len);
223 
224         if (!state->orig_buf)
225             continue;
226         if (!state->buf_off)
227             continue;
228 
229         // Does the existing buffer cover our section?
230         if ((start >= state->buf_start) &&
231             (start <= buf_end) &&
232             (end >= state->buf_start) &&
233             (end <= buf_end))
234         {
235             char *buf = state->orig_buf + (start - state->buf_start);
236 
237             qemu_iovec_from_buf(acb->qiov, 0, buf, len);
238             acb->common.cb(acb->common.opaque, 0);
239 
240             return FIND_RET_OK;
241         }
242 
243         // Wait for unfinished chunks
244         if (state->in_use &&
245             (start >= state->buf_start) &&
246             (start <= buf_fend) &&
247             (end >= state->buf_start) &&
248             (end <= buf_fend))
249         {
250             int j;
251 
252             acb->start = start - state->buf_start;
253             acb->end = acb->start + len;
254 
255             for (j=0; j<CURL_NUM_ACB; j++) {
256                 if (!state->acb[j]) {
257                     state->acb[j] = acb;
258                     return FIND_RET_WAIT;
259                 }
260             }
261         }
262     }
263 
264     return FIND_RET_NONE;
265 }
266 
267 static void curl_multi_check_completion(BDRVCURLState *s)
268 {
269     int msgs_in_queue;
270 
271     /* Try to find done transfers, so we can free the easy
272      * handle again. */
273     for (;;) {
274         CURLMsg *msg;
275         msg = curl_multi_info_read(s->multi, &msgs_in_queue);
276 
277         /* Quit when there are no more completions */
278         if (!msg)
279             break;
280 
281         if (msg->msg == CURLMSG_DONE) {
282             CURLState *state = NULL;
283             curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE,
284                               (char **)&state);
285 
286             /* ACBs for successful messages get completed in curl_read_cb */
287             if (msg->data.result != CURLE_OK) {
288                 int i;
289                 for (i = 0; i < CURL_NUM_ACB; i++) {
290                     CURLAIOCB *acb = state->acb[i];
291 
292                     if (acb == NULL) {
293                         continue;
294                     }
295 
296                     acb->common.cb(acb->common.opaque, -EIO);
297                     qemu_aio_release(acb);
298                     state->acb[i] = NULL;
299                 }
300             }
301 
302             curl_clean_state(state);
303             break;
304         }
305     }
306 }
307 
308 static void curl_multi_do(void *arg)
309 {
310     CURLState *s = (CURLState *)arg;
311     int running;
312     int r;
313 
314     if (!s->s->multi) {
315         return;
316     }
317 
318     do {
319         r = curl_multi_socket_action(s->s->multi, s->sock_fd, 0, &running);
320     } while(r == CURLM_CALL_MULTI_PERFORM);
321 
322 }
323 
324 static void curl_multi_read(void *arg)
325 {
326     CURLState *s = (CURLState *)arg;
327 
328     curl_multi_do(arg);
329     curl_multi_check_completion(s->s);
330 }
331 
332 static void curl_multi_timeout_do(void *arg)
333 {
334 #ifdef NEED_CURL_TIMER_CALLBACK
335     BDRVCURLState *s = (BDRVCURLState *)arg;
336     int running;
337 
338     if (!s->multi) {
339         return;
340     }
341 
342     curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running);
343 
344     curl_multi_check_completion(s);
345 #else
346     abort();
347 #endif
348 }
349 
350 static CURLState *curl_init_state(BDRVCURLState *s)
351 {
352     CURLState *state = NULL;
353     int i, j;
354 
355     do {
356         for (i=0; i<CURL_NUM_STATES; i++) {
357             for (j=0; j<CURL_NUM_ACB; j++)
358                 if (s->states[i].acb[j])
359                     continue;
360             if (s->states[i].in_use)
361                 continue;
362 
363             state = &s->states[i];
364             state->in_use = 1;
365             break;
366         }
367         if (!state) {
368             qemu_aio_wait();
369         }
370     } while(!state);
371 
372     if (!state->curl) {
373         state->curl = curl_easy_init();
374         if (!state->curl) {
375             return NULL;
376         }
377         curl_easy_setopt(state->curl, CURLOPT_URL, s->url);
378         curl_easy_setopt(state->curl, CURLOPT_SSL_VERIFYPEER,
379                          (long) s->sslverify);
380         curl_easy_setopt(state->curl, CURLOPT_TIMEOUT, 5);
381         curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION,
382                          (void *)curl_read_cb);
383         curl_easy_setopt(state->curl, CURLOPT_WRITEDATA, (void *)state);
384         curl_easy_setopt(state->curl, CURLOPT_PRIVATE, (void *)state);
385         curl_easy_setopt(state->curl, CURLOPT_AUTOREFERER, 1);
386         curl_easy_setopt(state->curl, CURLOPT_FOLLOWLOCATION, 1);
387         curl_easy_setopt(state->curl, CURLOPT_NOSIGNAL, 1);
388         curl_easy_setopt(state->curl, CURLOPT_ERRORBUFFER, state->errmsg);
389         curl_easy_setopt(state->curl, CURLOPT_FAILONERROR, 1);
390 
391         /* Restrict supported protocols to avoid security issues in the more
392          * obscure protocols.  For example, do not allow POP3/SMTP/IMAP see
393          * CVE-2013-0249.
394          *
395          * Restricting protocols is only supported from 7.19.4 upwards.
396          */
397 #if LIBCURL_VERSION_NUM >= 0x071304
398         curl_easy_setopt(state->curl, CURLOPT_PROTOCOLS, PROTOCOLS);
399         curl_easy_setopt(state->curl, CURLOPT_REDIR_PROTOCOLS, PROTOCOLS);
400 #endif
401 
402 #ifdef DEBUG_VERBOSE
403         curl_easy_setopt(state->curl, CURLOPT_VERBOSE, 1);
404 #endif
405     }
406 
407     state->s = s;
408 
409     return state;
410 }
411 
412 static void curl_clean_state(CURLState *s)
413 {
414     if (s->s->multi)
415         curl_multi_remove_handle(s->s->multi, s->curl);
416     s->in_use = 0;
417 }
418 
419 static void curl_parse_filename(const char *filename, QDict *options,
420                                 Error **errp)
421 {
422     qdict_put(options, CURL_BLOCK_OPT_URL, qstring_from_str(filename));
423 }
424 
425 static QemuOptsList runtime_opts = {
426     .name = "curl",
427     .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
428     .desc = {
429         {
430             .name = CURL_BLOCK_OPT_URL,
431             .type = QEMU_OPT_STRING,
432             .help = "URL to open",
433         },
434         {
435             .name = CURL_BLOCK_OPT_READAHEAD,
436             .type = QEMU_OPT_SIZE,
437             .help = "Readahead size",
438         },
439         {
440             .name = CURL_BLOCK_OPT_SSLVERIFY,
441             .type = QEMU_OPT_BOOL,
442             .help = "Verify SSL certificate"
443         },
444         { /* end of list */ }
445     },
446 };
447 
448 static int curl_open(BlockDriverState *bs, QDict *options, int flags,
449                      Error **errp)
450 {
451     BDRVCURLState *s = bs->opaque;
452     CURLState *state = NULL;
453     QemuOpts *opts;
454     Error *local_err = NULL;
455     const char *file;
456     double d;
457 
458     static int inited = 0;
459 
460     if (flags & BDRV_O_RDWR) {
461         error_setg(errp, "curl block device does not support writes");
462         return -EROFS;
463     }
464 
465     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
466     qemu_opts_absorb_qdict(opts, options, &local_err);
467     if (local_err) {
468         error_propagate(errp, local_err);
469         goto out_noclean;
470     }
471 
472     s->readahead_size = qemu_opt_get_size(opts, CURL_BLOCK_OPT_READAHEAD,
473                                           READ_AHEAD_DEFAULT);
474     if ((s->readahead_size & 0x1ff) != 0) {
475         error_setg(errp, "HTTP_READAHEAD_SIZE %zd is not a multiple of 512",
476                    s->readahead_size);
477         goto out_noclean;
478     }
479 
480     s->sslverify = qemu_opt_get_bool(opts, CURL_BLOCK_OPT_SSLVERIFY, true);
481 
482     file = qemu_opt_get(opts, CURL_BLOCK_OPT_URL);
483     if (file == NULL) {
484         error_setg(errp, "curl block driver requires an 'url' option");
485         goto out_noclean;
486     }
487 
488     if (!inited) {
489         curl_global_init(CURL_GLOBAL_ALL);
490         inited = 1;
491     }
492 
493     DPRINTF("CURL: Opening %s\n", file);
494     s->url = g_strdup(file);
495     state = curl_init_state(s);
496     if (!state)
497         goto out_noclean;
498 
499     // Get file size
500 
501     s->accept_range = false;
502     curl_easy_setopt(state->curl, CURLOPT_NOBODY, 1);
503     curl_easy_setopt(state->curl, CURLOPT_HEADERFUNCTION,
504                      curl_header_cb);
505     curl_easy_setopt(state->curl, CURLOPT_HEADERDATA, s);
506     if (curl_easy_perform(state->curl))
507         goto out;
508     curl_easy_getinfo(state->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &d);
509     if (d)
510         s->len = (size_t)d;
511     else if(!s->len)
512         goto out;
513     if ((!strncasecmp(s->url, "http://", strlen("http://"))
514         || !strncasecmp(s->url, "https://", strlen("https://")))
515         && !s->accept_range) {
516         pstrcpy(state->errmsg, CURL_ERROR_SIZE,
517                 "Server does not support 'range' (byte ranges).");
518         goto out;
519     }
520     DPRINTF("CURL: Size = %zd\n", s->len);
521 
522     curl_clean_state(state);
523     curl_easy_cleanup(state->curl);
524     state->curl = NULL;
525 
526     aio_timer_init(bdrv_get_aio_context(bs), &s->timer,
527                    QEMU_CLOCK_REALTIME, SCALE_NS,
528                    curl_multi_timeout_do, s);
529 
530     // Now we know the file exists and its size, so let's
531     // initialize the multi interface!
532 
533     s->multi = curl_multi_init();
534     curl_multi_setopt(s->multi, CURLMOPT_SOCKETFUNCTION, curl_sock_cb);
535 #ifdef NEED_CURL_TIMER_CALLBACK
536     curl_multi_setopt(s->multi, CURLMOPT_TIMERDATA, s);
537     curl_multi_setopt(s->multi, CURLMOPT_TIMERFUNCTION, curl_timer_cb);
538 #endif
539 
540     qemu_opts_del(opts);
541     return 0;
542 
543 out:
544     error_setg(errp, "CURL: Error opening file: %s", state->errmsg);
545     curl_easy_cleanup(state->curl);
546     state->curl = NULL;
547 out_noclean:
548     g_free(s->url);
549     qemu_opts_del(opts);
550     return -EINVAL;
551 }
552 
553 static void curl_aio_cancel(BlockDriverAIOCB *blockacb)
554 {
555     // Do we have to implement canceling? Seems to work without...
556 }
557 
558 static const AIOCBInfo curl_aiocb_info = {
559     .aiocb_size         = sizeof(CURLAIOCB),
560     .cancel             = curl_aio_cancel,
561 };
562 
563 
564 static void curl_readv_bh_cb(void *p)
565 {
566     CURLState *state;
567     int running;
568 
569     CURLAIOCB *acb = p;
570     BDRVCURLState *s = acb->common.bs->opaque;
571 
572     qemu_bh_delete(acb->bh);
573     acb->bh = NULL;
574 
575     size_t start = acb->sector_num * SECTOR_SIZE;
576     size_t end;
577 
578     // In case we have the requested data already (e.g. read-ahead),
579     // we can just call the callback and be done.
580     switch (curl_find_buf(s, start, acb->nb_sectors * SECTOR_SIZE, acb)) {
581         case FIND_RET_OK:
582             qemu_aio_release(acb);
583             // fall through
584         case FIND_RET_WAIT:
585             return;
586         default:
587             break;
588     }
589 
590     // No cache found, so let's start a new request
591     state = curl_init_state(s);
592     if (!state) {
593         acb->common.cb(acb->common.opaque, -EIO);
594         qemu_aio_release(acb);
595         return;
596     }
597 
598     acb->start = 0;
599     acb->end = (acb->nb_sectors * SECTOR_SIZE);
600 
601     state->buf_off = 0;
602     if (state->orig_buf)
603         g_free(state->orig_buf);
604     state->buf_start = start;
605     state->buf_len = acb->end + s->readahead_size;
606     end = MIN(start + state->buf_len, s->len) - 1;
607     state->orig_buf = g_malloc(state->buf_len);
608     state->acb[0] = acb;
609 
610     snprintf(state->range, 127, "%zd-%zd", start, end);
611     DPRINTF("CURL (AIO): Reading %d at %zd (%s)\n",
612             (acb->nb_sectors * SECTOR_SIZE), start, state->range);
613     curl_easy_setopt(state->curl, CURLOPT_RANGE, state->range);
614 
615     curl_multi_add_handle(s->multi, state->curl);
616 
617     /* Tell curl it needs to kick things off */
618     curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running);
619 }
620 
621 static BlockDriverAIOCB *curl_aio_readv(BlockDriverState *bs,
622         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
623         BlockDriverCompletionFunc *cb, void *opaque)
624 {
625     CURLAIOCB *acb;
626 
627     acb = qemu_aio_get(&curl_aiocb_info, bs, cb, opaque);
628 
629     acb->qiov = qiov;
630     acb->sector_num = sector_num;
631     acb->nb_sectors = nb_sectors;
632 
633     acb->bh = qemu_bh_new(curl_readv_bh_cb, acb);
634     qemu_bh_schedule(acb->bh);
635     return &acb->common;
636 }
637 
638 static void curl_close(BlockDriverState *bs)
639 {
640     BDRVCURLState *s = bs->opaque;
641     int i;
642 
643     DPRINTF("CURL: Close\n");
644     for (i=0; i<CURL_NUM_STATES; i++) {
645         if (s->states[i].in_use)
646             curl_clean_state(&s->states[i]);
647         if (s->states[i].curl) {
648             curl_easy_cleanup(s->states[i].curl);
649             s->states[i].curl = NULL;
650         }
651         if (s->states[i].orig_buf) {
652             g_free(s->states[i].orig_buf);
653             s->states[i].orig_buf = NULL;
654         }
655     }
656     if (s->multi)
657         curl_multi_cleanup(s->multi);
658 
659     timer_del(&s->timer);
660 
661     g_free(s->url);
662 }
663 
664 static int64_t curl_getlength(BlockDriverState *bs)
665 {
666     BDRVCURLState *s = bs->opaque;
667     return s->len;
668 }
669 
670 static BlockDriver bdrv_http = {
671     .format_name            = "http",
672     .protocol_name          = "http",
673 
674     .instance_size          = sizeof(BDRVCURLState),
675     .bdrv_parse_filename    = curl_parse_filename,
676     .bdrv_file_open         = curl_open,
677     .bdrv_close             = curl_close,
678     .bdrv_getlength         = curl_getlength,
679 
680     .bdrv_aio_readv         = curl_aio_readv,
681 };
682 
683 static BlockDriver bdrv_https = {
684     .format_name            = "https",
685     .protocol_name          = "https",
686 
687     .instance_size          = sizeof(BDRVCURLState),
688     .bdrv_parse_filename    = curl_parse_filename,
689     .bdrv_file_open         = curl_open,
690     .bdrv_close             = curl_close,
691     .bdrv_getlength         = curl_getlength,
692 
693     .bdrv_aio_readv         = curl_aio_readv,
694 };
695 
696 static BlockDriver bdrv_ftp = {
697     .format_name            = "ftp",
698     .protocol_name          = "ftp",
699 
700     .instance_size          = sizeof(BDRVCURLState),
701     .bdrv_parse_filename    = curl_parse_filename,
702     .bdrv_file_open         = curl_open,
703     .bdrv_close             = curl_close,
704     .bdrv_getlength         = curl_getlength,
705 
706     .bdrv_aio_readv         = curl_aio_readv,
707 };
708 
709 static BlockDriver bdrv_ftps = {
710     .format_name            = "ftps",
711     .protocol_name          = "ftps",
712 
713     .instance_size          = sizeof(BDRVCURLState),
714     .bdrv_parse_filename    = curl_parse_filename,
715     .bdrv_file_open         = curl_open,
716     .bdrv_close             = curl_close,
717     .bdrv_getlength         = curl_getlength,
718 
719     .bdrv_aio_readv         = curl_aio_readv,
720 };
721 
722 static BlockDriver bdrv_tftp = {
723     .format_name            = "tftp",
724     .protocol_name          = "tftp",
725 
726     .instance_size          = sizeof(BDRVCURLState),
727     .bdrv_parse_filename    = curl_parse_filename,
728     .bdrv_file_open         = curl_open,
729     .bdrv_close             = curl_close,
730     .bdrv_getlength         = curl_getlength,
731 
732     .bdrv_aio_readv         = curl_aio_readv,
733 };
734 
735 static void curl_block_init(void)
736 {
737     bdrv_register(&bdrv_http);
738     bdrv_register(&bdrv_https);
739     bdrv_register(&bdrv_ftp);
740     bdrv_register(&bdrv_ftps);
741     bdrv_register(&bdrv_tftp);
742 }
743 
744 block_init(curl_block_init);
745