xref: /openbmc/qemu/block/curl.c (revision 21063bce)
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-io.h"
31 #include "block/block_int.h"
32 #include "qapi/qmp/qdict.h"
33 #include "qapi/qmp/qstring.h"
34 #include "crypto/secret.h"
35 #include <curl/curl.h>
36 #include "qemu/cutils.h"
37 #include "trace.h"
38 
39 // #define DEBUG_VERBOSE
40 
41 /* CURL 7.85.0 switches to a string based API for specifying
42  * the desired protocols.
43  */
44 #if LIBCURL_VERSION_NUM >= 0x075500
45 #define PROTOCOLS "HTTP,HTTPS,FTP,FTPS"
46 #else
47 #define PROTOCOLS (CURLPROTO_HTTP | CURLPROTO_HTTPS | \
48                    CURLPROTO_FTP | CURLPROTO_FTPS)
49 #endif
50 
51 #define CURL_NUM_STATES 8
52 #define CURL_NUM_ACB    8
53 #define CURL_TIMEOUT_MAX 10000
54 
55 #define CURL_BLOCK_OPT_URL       "url"
56 #define CURL_BLOCK_OPT_READAHEAD "readahead"
57 #define CURL_BLOCK_OPT_SSLVERIFY "sslverify"
58 #define CURL_BLOCK_OPT_TIMEOUT "timeout"
59 #define CURL_BLOCK_OPT_COOKIE    "cookie"
60 #define CURL_BLOCK_OPT_COOKIE_SECRET "cookie-secret"
61 #define CURL_BLOCK_OPT_USERNAME "username"
62 #define CURL_BLOCK_OPT_PASSWORD_SECRET "password-secret"
63 #define CURL_BLOCK_OPT_PROXY_USERNAME "proxy-username"
64 #define CURL_BLOCK_OPT_PROXY_PASSWORD_SECRET "proxy-password-secret"
65 
66 #define CURL_BLOCK_OPT_READAHEAD_DEFAULT (256 * 1024)
67 #define CURL_BLOCK_OPT_SSLVERIFY_DEFAULT true
68 #define CURL_BLOCK_OPT_TIMEOUT_DEFAULT 5
69 
70 struct BDRVCURLState;
71 struct CURLState;
72 
73 static bool libcurl_initialized;
74 
75 typedef struct CURLAIOCB {
76     Coroutine *co;
77     QEMUIOVector *qiov;
78 
79     uint64_t offset;
80     uint64_t bytes;
81     int ret;
82 
83     size_t start;
84     size_t end;
85 } CURLAIOCB;
86 
87 typedef struct CURLSocket {
88     int fd;
89     struct BDRVCURLState *s;
90 } CURLSocket;
91 
92 typedef struct CURLState
93 {
94     struct BDRVCURLState *s;
95     CURLAIOCB *acb[CURL_NUM_ACB];
96     CURL *curl;
97     char *orig_buf;
98     uint64_t buf_start;
99     size_t buf_off;
100     size_t buf_len;
101     char range[128];
102     char errmsg[CURL_ERROR_SIZE];
103     char in_use;
104 } CURLState;
105 
106 typedef struct BDRVCURLState {
107     CURLM *multi;
108     QEMUTimer timer;
109     uint64_t len;
110     CURLState states[CURL_NUM_STATES];
111     GHashTable *sockets; /* GINT_TO_POINTER(fd) -> socket */
112     char *url;
113     size_t readahead_size;
114     bool sslverify;
115     uint64_t timeout;
116     char *cookie;
117     bool accept_range;
118     AioContext *aio_context;
119     QemuMutex mutex;
120     CoQueue free_state_waitq;
121     char *username;
122     char *password;
123     char *proxyusername;
124     char *proxypassword;
125 } BDRVCURLState;
126 
127 static void curl_clean_state(CURLState *s);
128 static void curl_multi_do(void *arg);
129 
130 static gboolean curl_drop_socket(void *key, void *value, void *opaque)
131 {
132     CURLSocket *socket = value;
133     BDRVCURLState *s = socket->s;
134 
135     aio_set_fd_handler(s->aio_context, socket->fd, false,
136                        NULL, NULL, NULL, NULL, NULL);
137     return true;
138 }
139 
140 static void curl_drop_all_sockets(GHashTable *sockets)
141 {
142     g_hash_table_foreach_remove(sockets, curl_drop_socket, NULL);
143 }
144 
145 /* Called from curl_multi_do_locked, with s->mutex held.  */
146 static int curl_timer_cb(CURLM *multi, long timeout_ms, void *opaque)
147 {
148     BDRVCURLState *s = opaque;
149 
150     trace_curl_timer_cb(timeout_ms);
151     if (timeout_ms == -1) {
152         timer_del(&s->timer);
153     } else {
154         int64_t timeout_ns = (int64_t)timeout_ms * 1000 * 1000;
155         timer_mod(&s->timer,
156                   qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + timeout_ns);
157     }
158     return 0;
159 }
160 
161 /* Called from curl_multi_do_locked, with s->mutex held.  */
162 static 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     socket = g_hash_table_lookup(s->sockets, GINT_TO_POINTER(fd));
173     if (!socket) {
174         socket = g_new0(CURLSocket, 1);
175         socket->fd = fd;
176         socket->s = s;
177         g_hash_table_insert(s->sockets, GINT_TO_POINTER(fd), socket);
178     }
179 
180     trace_curl_sock_cb(action, (int)fd);
181     switch (action) {
182         case CURL_POLL_IN:
183             aio_set_fd_handler(s->aio_context, fd, false,
184                                curl_multi_do, NULL, NULL, NULL, socket);
185             break;
186         case CURL_POLL_OUT:
187             aio_set_fd_handler(s->aio_context, fd, false,
188                                NULL, curl_multi_do, NULL, NULL, socket);
189             break;
190         case CURL_POLL_INOUT:
191             aio_set_fd_handler(s->aio_context, fd, false,
192                                curl_multi_do, curl_multi_do,
193                                NULL, NULL, socket);
194             break;
195         case CURL_POLL_REMOVE:
196             aio_set_fd_handler(s->aio_context, fd, false,
197                                NULL, NULL, NULL, NULL, NULL);
198             break;
199     }
200 
201     if (action == CURL_POLL_REMOVE) {
202         g_hash_table_remove(s->sockets, GINT_TO_POINTER(fd));
203     }
204 
205     return 0;
206 }
207 
208 /* Called from curl_multi_do_locked, with s->mutex held.  */
209 static size_t curl_header_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
210 {
211     BDRVCURLState *s = opaque;
212     size_t realsize = size * nmemb;
213     const char *header = (char *)ptr;
214     const char *end = header + realsize;
215     const char *accept_ranges = "accept-ranges:";
216     const char *bytes = "bytes";
217 
218     if (realsize >= strlen(accept_ranges)
219         && g_ascii_strncasecmp(header, accept_ranges,
220                                strlen(accept_ranges)) == 0) {
221 
222         char *p = strchr(header, ':') + 1;
223 
224         /* Skip whitespace between the header name and value. */
225         while (p < end && *p && g_ascii_isspace(*p)) {
226             p++;
227         }
228 
229         if (end - p >= strlen(bytes)
230             && strncmp(p, bytes, strlen(bytes)) == 0) {
231 
232             /* Check that there is nothing but whitespace after the value. */
233             p += strlen(bytes);
234             while (p < end && *p && g_ascii_isspace(*p)) {
235                 p++;
236             }
237 
238             if (p == end || !*p) {
239                 s->accept_range = true;
240             }
241         }
242     }
243 
244     return realsize;
245 }
246 
247 /* Called from curl_multi_do_locked, with s->mutex held.  */
248 static size_t curl_read_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
249 {
250     CURLState *s = ((CURLState*)opaque);
251     size_t realsize = size * nmemb;
252 
253     trace_curl_read_cb(realsize);
254 
255     if (!s || !s->orig_buf) {
256         goto read_end;
257     }
258 
259     if (s->buf_off >= s->buf_len) {
260         /* buffer full, read nothing */
261         goto read_end;
262     }
263     realsize = MIN(realsize, s->buf_len - s->buf_off);
264     memcpy(s->orig_buf + s->buf_off, ptr, realsize);
265     s->buf_off += realsize;
266 
267 read_end:
268     /* curl will error out if we do not return this value */
269     return size * nmemb;
270 }
271 
272 /* Called with s->mutex held.  */
273 static bool curl_find_buf(BDRVCURLState *s, uint64_t start, uint64_t len,
274                           CURLAIOCB *acb)
275 {
276     int i;
277     uint64_t end = start + len;
278     uint64_t clamped_end = MIN(end, s->len);
279     uint64_t clamped_len = clamped_end - start;
280 
281     for (i=0; i<CURL_NUM_STATES; i++) {
282         CURLState *state = &s->states[i];
283         uint64_t buf_end = (state->buf_start + state->buf_off);
284         uint64_t buf_fend = (state->buf_start + state->buf_len);
285 
286         if (!state->orig_buf)
287             continue;
288         if (!state->buf_off)
289             continue;
290 
291         // Does the existing buffer cover our section?
292         if ((start >= state->buf_start) &&
293             (start <= buf_end) &&
294             (clamped_end >= state->buf_start) &&
295             (clamped_end <= buf_end))
296         {
297             char *buf = state->orig_buf + (start - state->buf_start);
298 
299             qemu_iovec_from_buf(acb->qiov, 0, buf, clamped_len);
300             if (clamped_len < len) {
301                 qemu_iovec_memset(acb->qiov, clamped_len, 0, len - clamped_len);
302             }
303             acb->ret = 0;
304             return true;
305         }
306 
307         // Wait for unfinished chunks
308         if (state->in_use &&
309             (start >= state->buf_start) &&
310             (start <= buf_fend) &&
311             (clamped_end >= state->buf_start) &&
312             (clamped_end <= buf_fend))
313         {
314             int j;
315 
316             acb->start = start - state->buf_start;
317             acb->end = acb->start + clamped_len;
318 
319             for (j=0; j<CURL_NUM_ACB; j++) {
320                 if (!state->acb[j]) {
321                     state->acb[j] = acb;
322                     return true;
323                 }
324             }
325         }
326     }
327 
328     return false;
329 }
330 
331 /* Called with s->mutex held.  */
332 static void curl_multi_check_completion(BDRVCURLState *s)
333 {
334     int msgs_in_queue;
335 
336     /* Try to find done transfers, so we can free the easy
337      * handle again. */
338     for (;;) {
339         CURLMsg *msg;
340         msg = curl_multi_info_read(s->multi, &msgs_in_queue);
341 
342         /* Quit when there are no more completions */
343         if (!msg)
344             break;
345 
346         if (msg->msg == CURLMSG_DONE) {
347             int i;
348             CURLState *state = NULL;
349             bool error = msg->data.result != CURLE_OK;
350 
351             curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE,
352                               (char **)&state);
353 
354             if (error) {
355                 static int errcount = 100;
356 
357                 /* Don't lose the original error message from curl, since
358                  * it contains extra data.
359                  */
360                 if (errcount > 0) {
361                     error_report("curl: %s", state->errmsg);
362                     if (--errcount == 0) {
363                         error_report("curl: further errors suppressed");
364                     }
365                 }
366             }
367 
368             for (i = 0; i < CURL_NUM_ACB; i++) {
369                 CURLAIOCB *acb = state->acb[i];
370 
371                 if (acb == NULL) {
372                     continue;
373                 }
374 
375                 if (!error) {
376                     /* Assert that we have read all data */
377                     assert(state->buf_off >= acb->end);
378 
379                     qemu_iovec_from_buf(acb->qiov, 0,
380                                         state->orig_buf + acb->start,
381                                         acb->end - acb->start);
382 
383                     if (acb->end - acb->start < acb->bytes) {
384                         size_t offset = acb->end - acb->start;
385                         qemu_iovec_memset(acb->qiov, offset, 0,
386                                           acb->bytes - offset);
387                     }
388                 }
389 
390                 acb->ret = error ? -EIO : 0;
391                 state->acb[i] = NULL;
392                 qemu_mutex_unlock(&s->mutex);
393                 aio_co_wake(acb->co);
394                 qemu_mutex_lock(&s->mutex);
395             }
396 
397             curl_clean_state(state);
398             break;
399         }
400     }
401 }
402 
403 /* Called with s->mutex held.  */
404 static void curl_multi_do_locked(CURLSocket *socket)
405 {
406     BDRVCURLState *s = socket->s;
407     int running;
408     int r;
409 
410     if (!s->multi) {
411         return;
412     }
413 
414     do {
415         r = curl_multi_socket_action(s->multi, socket->fd, 0, &running);
416     } while (r == CURLM_CALL_MULTI_PERFORM);
417 }
418 
419 static void curl_multi_do(void *arg)
420 {
421     CURLSocket *socket = arg;
422     BDRVCURLState *s = socket->s;
423 
424     qemu_mutex_lock(&s->mutex);
425     curl_multi_do_locked(socket);
426     curl_multi_check_completion(s);
427     qemu_mutex_unlock(&s->mutex);
428 }
429 
430 static void curl_multi_timeout_do(void *arg)
431 {
432     BDRVCURLState *s = (BDRVCURLState *)arg;
433     int running;
434 
435     if (!s->multi) {
436         return;
437     }
438 
439     qemu_mutex_lock(&s->mutex);
440     curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running);
441 
442     curl_multi_check_completion(s);
443     qemu_mutex_unlock(&s->mutex);
444 }
445 
446 /* Called with s->mutex held.  */
447 static CURLState *curl_find_state(BDRVCURLState *s)
448 {
449     CURLState *state = NULL;
450     int i;
451 
452     for (i = 0; i < CURL_NUM_STATES; i++) {
453         if (!s->states[i].in_use) {
454             state = &s->states[i];
455             state->in_use = 1;
456             break;
457         }
458     }
459     return state;
460 }
461 
462 static int curl_init_state(BDRVCURLState *s, CURLState *state)
463 {
464     if (!state->curl) {
465         state->curl = curl_easy_init();
466         if (!state->curl) {
467             return -EIO;
468         }
469         if (curl_easy_setopt(state->curl, CURLOPT_URL, s->url) ||
470             curl_easy_setopt(state->curl, CURLOPT_SSL_VERIFYPEER,
471                              (long) s->sslverify) ||
472             curl_easy_setopt(state->curl, CURLOPT_SSL_VERIFYHOST,
473                              s->sslverify ? 2L : 0L)) {
474             goto err;
475         }
476         if (s->cookie) {
477             if (curl_easy_setopt(state->curl, CURLOPT_COOKIE, s->cookie)) {
478                 goto err;
479             }
480         }
481         if (curl_easy_setopt(state->curl, CURLOPT_TIMEOUT, (long)s->timeout) ||
482             curl_easy_setopt(state->curl, CURLOPT_WRITEFUNCTION,
483                              (void *)curl_read_cb) ||
484             curl_easy_setopt(state->curl, CURLOPT_WRITEDATA, (void *)state) ||
485             curl_easy_setopt(state->curl, CURLOPT_PRIVATE, (void *)state) ||
486             curl_easy_setopt(state->curl, CURLOPT_AUTOREFERER, 1) ||
487             curl_easy_setopt(state->curl, CURLOPT_FOLLOWLOCATION, 1) ||
488             curl_easy_setopt(state->curl, CURLOPT_NOSIGNAL, 1) ||
489             curl_easy_setopt(state->curl, CURLOPT_ERRORBUFFER, state->errmsg) ||
490             curl_easy_setopt(state->curl, CURLOPT_FAILONERROR, 1)) {
491             goto err;
492         }
493         if (s->username) {
494             if (curl_easy_setopt(state->curl, CURLOPT_USERNAME, s->username)) {
495                 goto err;
496             }
497         }
498         if (s->password) {
499             if (curl_easy_setopt(state->curl, CURLOPT_PASSWORD, s->password)) {
500                 goto err;
501             }
502         }
503         if (s->proxyusername) {
504             if (curl_easy_setopt(state->curl,
505                                  CURLOPT_PROXYUSERNAME, s->proxyusername)) {
506                 goto err;
507             }
508         }
509         if (s->proxypassword) {
510             if (curl_easy_setopt(state->curl,
511                                  CURLOPT_PROXYPASSWORD, s->proxypassword)) {
512                 goto err;
513             }
514         }
515 
516         /* Restrict supported protocols to avoid security issues in the more
517          * obscure protocols.  For example, do not allow POP3/SMTP/IMAP see
518          * CVE-2013-0249.
519          *
520          * Restricting protocols is only supported from 7.19.4 upwards. Note:
521          * version 7.85.0 deprecates CURLOPT_*PROTOCOLS in favour of a string
522          * based CURLOPT_*PROTOCOLS_STR API.
523          */
524 #if LIBCURL_VERSION_NUM >= 0x075500
525         if (curl_easy_setopt(state->curl,
526                              CURLOPT_PROTOCOLS_STR, PROTOCOLS) ||
527             curl_easy_setopt(state->curl,
528                              CURLOPT_REDIR_PROTOCOLS_STR, PROTOCOLS)) {
529             goto err;
530         }
531 #elif LIBCURL_VERSION_NUM >= 0x071304
532         if (curl_easy_setopt(state->curl, CURLOPT_PROTOCOLS, PROTOCOLS) ||
533             curl_easy_setopt(state->curl, CURLOPT_REDIR_PROTOCOLS, PROTOCOLS)) {
534             goto err;
535         }
536 #endif
537 
538 #ifdef DEBUG_VERBOSE
539         if (curl_easy_setopt(state->curl, CURLOPT_VERBOSE, 1)) {
540             goto err;
541         }
542 #endif
543     }
544 
545     state->s = s;
546 
547     return 0;
548 
549 err:
550     curl_easy_cleanup(state->curl);
551     state->curl = NULL;
552     return -EIO;
553 }
554 
555 /* Called with s->mutex held.  */
556 static void curl_clean_state(CURLState *s)
557 {
558     int j;
559     for (j = 0; j < CURL_NUM_ACB; j++) {
560         assert(!s->acb[j]);
561     }
562 
563     if (s->s->multi)
564         curl_multi_remove_handle(s->s->multi, s->curl);
565 
566     s->in_use = 0;
567 
568     qemu_co_enter_next(&s->s->free_state_waitq, &s->s->mutex);
569 }
570 
571 static void curl_parse_filename(const char *filename, QDict *options,
572                                 Error **errp)
573 {
574     qdict_put_str(options, CURL_BLOCK_OPT_URL, filename);
575 }
576 
577 static void curl_detach_aio_context(BlockDriverState *bs)
578 {
579     BDRVCURLState *s = bs->opaque;
580     int i;
581 
582     WITH_QEMU_LOCK_GUARD(&s->mutex) {
583         curl_drop_all_sockets(s->sockets);
584         for (i = 0; i < CURL_NUM_STATES; i++) {
585             if (s->states[i].in_use) {
586                 curl_clean_state(&s->states[i]);
587             }
588             if (s->states[i].curl) {
589                 curl_easy_cleanup(s->states[i].curl);
590                 s->states[i].curl = NULL;
591             }
592             g_free(s->states[i].orig_buf);
593             s->states[i].orig_buf = NULL;
594         }
595         if (s->multi) {
596             curl_multi_cleanup(s->multi);
597             s->multi = NULL;
598         }
599     }
600 
601     timer_del(&s->timer);
602 }
603 
604 static void curl_attach_aio_context(BlockDriverState *bs,
605                                     AioContext *new_context)
606 {
607     BDRVCURLState *s = bs->opaque;
608 
609     aio_timer_init(new_context, &s->timer,
610                    QEMU_CLOCK_REALTIME, SCALE_NS,
611                    curl_multi_timeout_do, s);
612 
613     assert(!s->multi);
614     s->multi = curl_multi_init();
615     s->aio_context = new_context;
616     curl_multi_setopt(s->multi, CURLMOPT_SOCKETFUNCTION, curl_sock_cb);
617     curl_multi_setopt(s->multi, CURLMOPT_TIMERDATA, s);
618     curl_multi_setopt(s->multi, CURLMOPT_TIMERFUNCTION, curl_timer_cb);
619 }
620 
621 static QemuOptsList runtime_opts = {
622     .name = "curl",
623     .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
624     .desc = {
625         {
626             .name = CURL_BLOCK_OPT_URL,
627             .type = QEMU_OPT_STRING,
628             .help = "URL to open",
629         },
630         {
631             .name = CURL_BLOCK_OPT_READAHEAD,
632             .type = QEMU_OPT_SIZE,
633             .help = "Readahead size",
634         },
635         {
636             .name = CURL_BLOCK_OPT_SSLVERIFY,
637             .type = QEMU_OPT_BOOL,
638             .help = "Verify SSL certificate"
639         },
640         {
641             .name = CURL_BLOCK_OPT_TIMEOUT,
642             .type = QEMU_OPT_NUMBER,
643             .help = "Curl timeout"
644         },
645         {
646             .name = CURL_BLOCK_OPT_COOKIE,
647             .type = QEMU_OPT_STRING,
648             .help = "Pass the cookie or list of cookies with each request"
649         },
650         {
651             .name = CURL_BLOCK_OPT_COOKIE_SECRET,
652             .type = QEMU_OPT_STRING,
653             .help = "ID of secret used as cookie passed with each request"
654         },
655         {
656             .name = CURL_BLOCK_OPT_USERNAME,
657             .type = QEMU_OPT_STRING,
658             .help = "Username for HTTP auth"
659         },
660         {
661             .name = CURL_BLOCK_OPT_PASSWORD_SECRET,
662             .type = QEMU_OPT_STRING,
663             .help = "ID of secret used as password for HTTP auth",
664         },
665         {
666             .name = CURL_BLOCK_OPT_PROXY_USERNAME,
667             .type = QEMU_OPT_STRING,
668             .help = "Username for HTTP proxy auth"
669         },
670         {
671             .name = CURL_BLOCK_OPT_PROXY_PASSWORD_SECRET,
672             .type = QEMU_OPT_STRING,
673             .help = "ID of secret used as password for HTTP proxy auth",
674         },
675         { /* end of list */ }
676     },
677 };
678 
679 
680 static int curl_open(BlockDriverState *bs, QDict *options, int flags,
681                      Error **errp)
682 {
683     BDRVCURLState *s = bs->opaque;
684     CURLState *state = NULL;
685     QemuOpts *opts;
686     const char *file;
687     const char *cookie;
688     const char *cookie_secret;
689     /* CURL >= 7.55.0 uses curl_off_t for content length instead of a double */
690 #if LIBCURL_VERSION_NUM >= 0x073700
691     curl_off_t cl;
692 #else
693     double cl;
694 #endif
695     const char *secretid;
696     const char *protocol_delimiter;
697     int ret;
698 
699     ret = bdrv_apply_auto_read_only(bs, "curl driver does not support writes",
700                                     errp);
701     if (ret < 0) {
702         return ret;
703     }
704 
705     if (!libcurl_initialized) {
706         ret = curl_global_init(CURL_GLOBAL_ALL);
707         if (ret) {
708             error_setg(errp, "libcurl initialization failed with %d", ret);
709             return -EIO;
710         }
711         libcurl_initialized = true;
712     }
713 
714     qemu_mutex_init(&s->mutex);
715     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
716     if (!qemu_opts_absorb_qdict(opts, options, errp)) {
717         goto out_noclean;
718     }
719 
720     s->readahead_size = qemu_opt_get_size(opts, CURL_BLOCK_OPT_READAHEAD,
721                                           CURL_BLOCK_OPT_READAHEAD_DEFAULT);
722     if ((s->readahead_size & 0x1ff) != 0) {
723         error_setg(errp, "HTTP_READAHEAD_SIZE %zd is not a multiple of 512",
724                    s->readahead_size);
725         goto out_noclean;
726     }
727 
728     s->timeout = qemu_opt_get_number(opts, CURL_BLOCK_OPT_TIMEOUT,
729                                      CURL_BLOCK_OPT_TIMEOUT_DEFAULT);
730     if (s->timeout > CURL_TIMEOUT_MAX) {
731         error_setg(errp, "timeout parameter is too large or negative");
732         goto out_noclean;
733     }
734 
735     s->sslverify = qemu_opt_get_bool(opts, CURL_BLOCK_OPT_SSLVERIFY,
736                                      CURL_BLOCK_OPT_SSLVERIFY_DEFAULT);
737 
738     cookie = qemu_opt_get(opts, CURL_BLOCK_OPT_COOKIE);
739     cookie_secret = qemu_opt_get(opts, CURL_BLOCK_OPT_COOKIE_SECRET);
740 
741     if (cookie && cookie_secret) {
742         error_setg(errp,
743                    "curl driver cannot handle both cookie and cookie secret");
744         goto out_noclean;
745     }
746 
747     if (cookie_secret) {
748         s->cookie = qcrypto_secret_lookup_as_utf8(cookie_secret, errp);
749         if (!s->cookie) {
750             goto out_noclean;
751         }
752     } else {
753         s->cookie = g_strdup(cookie);
754     }
755 
756     file = qemu_opt_get(opts, CURL_BLOCK_OPT_URL);
757     if (file == NULL) {
758         error_setg(errp, "curl block driver requires an 'url' option");
759         goto out_noclean;
760     }
761 
762     if (!strstart(file, bs->drv->protocol_name, &protocol_delimiter) ||
763         !strstart(protocol_delimiter, "://", NULL))
764     {
765         error_setg(errp, "%s curl driver cannot handle the URL '%s' (does not "
766                    "start with '%s://')", bs->drv->protocol_name, file,
767                    bs->drv->protocol_name);
768         goto out_noclean;
769     }
770 
771     s->username = g_strdup(qemu_opt_get(opts, CURL_BLOCK_OPT_USERNAME));
772     secretid = qemu_opt_get(opts, CURL_BLOCK_OPT_PASSWORD_SECRET);
773 
774     if (secretid) {
775         s->password = qcrypto_secret_lookup_as_utf8(secretid, errp);
776         if (!s->password) {
777             goto out_noclean;
778         }
779     }
780 
781     s->proxyusername = g_strdup(
782         qemu_opt_get(opts, CURL_BLOCK_OPT_PROXY_USERNAME));
783     secretid = qemu_opt_get(opts, CURL_BLOCK_OPT_PROXY_PASSWORD_SECRET);
784     if (secretid) {
785         s->proxypassword = qcrypto_secret_lookup_as_utf8(secretid, errp);
786         if (!s->proxypassword) {
787             goto out_noclean;
788         }
789     }
790 
791     trace_curl_open(file);
792     qemu_co_queue_init(&s->free_state_waitq);
793     s->aio_context = bdrv_get_aio_context(bs);
794     s->url = g_strdup(file);
795     s->sockets = g_hash_table_new_full(NULL, NULL, NULL, g_free);
796     qemu_mutex_lock(&s->mutex);
797     state = curl_find_state(s);
798     qemu_mutex_unlock(&s->mutex);
799     if (!state) {
800         goto out_noclean;
801     }
802 
803     // Get file size
804 
805     if (curl_init_state(s, state) < 0) {
806         pstrcpy(state->errmsg, CURL_ERROR_SIZE,
807                 "curl library initialization failed.");
808         goto out;
809     }
810 
811     s->accept_range = false;
812     if (curl_easy_setopt(state->curl, CURLOPT_NOBODY, 1) ||
813         curl_easy_setopt(state->curl, CURLOPT_HEADERFUNCTION, curl_header_cb) ||
814         curl_easy_setopt(state->curl, CURLOPT_HEADERDATA, s)) {
815         pstrcpy(state->errmsg, CURL_ERROR_SIZE,
816                 "curl library initialization failed.");
817         goto out;
818     }
819     if (curl_easy_perform(state->curl))
820         goto out;
821     /* CURL 7.55.0 deprecates CURLINFO_CONTENT_LENGTH_DOWNLOAD in favour of
822      * the *_T version which returns a more sensible type for content length.
823      */
824 #if LIBCURL_VERSION_NUM >= 0x073700
825     if (curl_easy_getinfo(state->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD_T, &cl)) {
826         goto out;
827     }
828 #else
829     if (curl_easy_getinfo(state->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &cl)) {
830         goto out;
831     }
832 #endif
833     /* Prior CURL 7.19.4 return value of 0 could mean that the file size is not
834      * know or the size is zero. From 7.19.4 CURL returns -1 if size is not
835      * known and zero if it is really zero-length file. */
836 #if LIBCURL_VERSION_NUM >= 0x071304
837     if (cl < 0) {
838         pstrcpy(state->errmsg, CURL_ERROR_SIZE,
839                 "Server didn't report file size.");
840         goto out;
841     }
842 #else
843     if (cl <= 0) {
844         pstrcpy(state->errmsg, CURL_ERROR_SIZE,
845                 "Unknown file size or zero-length file.");
846         goto out;
847     }
848 #endif
849 
850     s->len = cl;
851 
852     if ((!strncasecmp(s->url, "http://", strlen("http://"))
853         || !strncasecmp(s->url, "https://", strlen("https://")))
854         && !s->accept_range) {
855         pstrcpy(state->errmsg, CURL_ERROR_SIZE,
856                 "Server does not support 'range' (byte ranges).");
857         goto out;
858     }
859     trace_curl_open_size(s->len);
860 
861     qemu_mutex_lock(&s->mutex);
862     curl_clean_state(state);
863     qemu_mutex_unlock(&s->mutex);
864     curl_easy_cleanup(state->curl);
865     state->curl = NULL;
866 
867     curl_attach_aio_context(bs, bdrv_get_aio_context(bs));
868 
869     qemu_opts_del(opts);
870     return 0;
871 
872 out:
873     error_setg(errp, "CURL: Error opening file: %s", state->errmsg);
874     curl_easy_cleanup(state->curl);
875     state->curl = NULL;
876 out_noclean:
877     qemu_mutex_destroy(&s->mutex);
878     g_free(s->cookie);
879     g_free(s->url);
880     g_free(s->username);
881     g_free(s->proxyusername);
882     g_free(s->proxypassword);
883     if (s->sockets) {
884         curl_drop_all_sockets(s->sockets);
885         g_hash_table_destroy(s->sockets);
886     }
887     qemu_opts_del(opts);
888     return -EINVAL;
889 }
890 
891 static void coroutine_fn curl_setup_preadv(BlockDriverState *bs, CURLAIOCB *acb)
892 {
893     CURLState *state;
894     int running;
895 
896     BDRVCURLState *s = bs->opaque;
897 
898     uint64_t start = acb->offset;
899     uint64_t end;
900 
901     qemu_mutex_lock(&s->mutex);
902 
903     // In case we have the requested data already (e.g. read-ahead),
904     // we can just call the callback and be done.
905     if (curl_find_buf(s, start, acb->bytes, acb)) {
906         goto out;
907     }
908 
909     // No cache found, so let's start a new request
910     for (;;) {
911         state = curl_find_state(s);
912         if (state) {
913             break;
914         }
915         qemu_co_queue_wait(&s->free_state_waitq, &s->mutex);
916     }
917 
918     if (curl_init_state(s, state) < 0) {
919         curl_clean_state(state);
920         acb->ret = -EIO;
921         goto out;
922     }
923 
924     acb->start = 0;
925     acb->end = MIN(acb->bytes, s->len - start);
926 
927     state->buf_off = 0;
928     g_free(state->orig_buf);
929     state->buf_start = start;
930     state->buf_len = MIN(acb->end + s->readahead_size, s->len - start);
931     end = start + state->buf_len - 1;
932     state->orig_buf = g_try_malloc(state->buf_len);
933     if (state->buf_len && state->orig_buf == NULL) {
934         curl_clean_state(state);
935         acb->ret = -ENOMEM;
936         goto out;
937     }
938     state->acb[0] = acb;
939 
940     snprintf(state->range, 127, "%" PRIu64 "-%" PRIu64, start, end);
941     trace_curl_setup_preadv(acb->bytes, start, state->range);
942     if (curl_easy_setopt(state->curl, CURLOPT_RANGE, state->range) ||
943         curl_multi_add_handle(s->multi, state->curl) != CURLM_OK) {
944         state->acb[0] = NULL;
945         acb->ret = -EIO;
946 
947         curl_clean_state(state);
948         goto out;
949     }
950 
951     /* Tell curl it needs to kick things off */
952     curl_multi_socket_action(s->multi, CURL_SOCKET_TIMEOUT, 0, &running);
953 
954 out:
955     qemu_mutex_unlock(&s->mutex);
956 }
957 
958 static int coroutine_fn curl_co_preadv(BlockDriverState *bs,
959         int64_t offset, int64_t bytes, QEMUIOVector *qiov,
960         BdrvRequestFlags flags)
961 {
962     CURLAIOCB acb = {
963         .co = qemu_coroutine_self(),
964         .ret = -EINPROGRESS,
965         .qiov = qiov,
966         .offset = offset,
967         .bytes = bytes
968     };
969 
970     curl_setup_preadv(bs, &acb);
971     while (acb.ret == -EINPROGRESS) {
972         qemu_coroutine_yield();
973     }
974     return acb.ret;
975 }
976 
977 static void curl_close(BlockDriverState *bs)
978 {
979     BDRVCURLState *s = bs->opaque;
980 
981     trace_curl_close();
982     curl_detach_aio_context(bs);
983     qemu_mutex_destroy(&s->mutex);
984 
985     g_hash_table_destroy(s->sockets);
986     g_free(s->cookie);
987     g_free(s->url);
988     g_free(s->username);
989     g_free(s->proxyusername);
990     g_free(s->proxypassword);
991 }
992 
993 static int64_t coroutine_fn curl_co_getlength(BlockDriverState *bs)
994 {
995     BDRVCURLState *s = bs->opaque;
996     return s->len;
997 }
998 
999 static void curl_refresh_filename(BlockDriverState *bs)
1000 {
1001     BDRVCURLState *s = bs->opaque;
1002 
1003     /* "readahead" and "timeout" do not change the guest-visible data,
1004      * so ignore them */
1005     if (s->sslverify != CURL_BLOCK_OPT_SSLVERIFY_DEFAULT ||
1006         s->cookie || s->username || s->password || s->proxyusername ||
1007         s->proxypassword)
1008     {
1009         return;
1010     }
1011 
1012     pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), s->url);
1013 }
1014 
1015 
1016 static const char *const curl_strong_runtime_opts[] = {
1017     CURL_BLOCK_OPT_URL,
1018     CURL_BLOCK_OPT_SSLVERIFY,
1019     CURL_BLOCK_OPT_COOKIE,
1020     CURL_BLOCK_OPT_COOKIE_SECRET,
1021     CURL_BLOCK_OPT_USERNAME,
1022     CURL_BLOCK_OPT_PASSWORD_SECRET,
1023     CURL_BLOCK_OPT_PROXY_USERNAME,
1024     CURL_BLOCK_OPT_PROXY_PASSWORD_SECRET,
1025 
1026     NULL
1027 };
1028 
1029 static BlockDriver bdrv_http = {
1030     .format_name                = "http",
1031     .protocol_name              = "http",
1032 
1033     .instance_size              = sizeof(BDRVCURLState),
1034     .bdrv_parse_filename        = curl_parse_filename,
1035     .bdrv_file_open             = curl_open,
1036     .bdrv_close                 = curl_close,
1037     .bdrv_co_getlength          = curl_co_getlength,
1038 
1039     .bdrv_co_preadv             = curl_co_preadv,
1040 
1041     .bdrv_detach_aio_context    = curl_detach_aio_context,
1042     .bdrv_attach_aio_context    = curl_attach_aio_context,
1043 
1044     .bdrv_refresh_filename      = curl_refresh_filename,
1045     .strong_runtime_opts        = curl_strong_runtime_opts,
1046 };
1047 
1048 static BlockDriver bdrv_https = {
1049     .format_name                = "https",
1050     .protocol_name              = "https",
1051 
1052     .instance_size              = sizeof(BDRVCURLState),
1053     .bdrv_parse_filename        = curl_parse_filename,
1054     .bdrv_file_open             = curl_open,
1055     .bdrv_close                 = curl_close,
1056     .bdrv_co_getlength          = curl_co_getlength,
1057 
1058     .bdrv_co_preadv             = curl_co_preadv,
1059 
1060     .bdrv_detach_aio_context    = curl_detach_aio_context,
1061     .bdrv_attach_aio_context    = curl_attach_aio_context,
1062 
1063     .bdrv_refresh_filename      = curl_refresh_filename,
1064     .strong_runtime_opts        = curl_strong_runtime_opts,
1065 };
1066 
1067 static BlockDriver bdrv_ftp = {
1068     .format_name                = "ftp",
1069     .protocol_name              = "ftp",
1070 
1071     .instance_size              = sizeof(BDRVCURLState),
1072     .bdrv_parse_filename        = curl_parse_filename,
1073     .bdrv_file_open             = curl_open,
1074     .bdrv_close                 = curl_close,
1075     .bdrv_co_getlength          = curl_co_getlength,
1076 
1077     .bdrv_co_preadv             = curl_co_preadv,
1078 
1079     .bdrv_detach_aio_context    = curl_detach_aio_context,
1080     .bdrv_attach_aio_context    = curl_attach_aio_context,
1081 
1082     .bdrv_refresh_filename      = curl_refresh_filename,
1083     .strong_runtime_opts        = curl_strong_runtime_opts,
1084 };
1085 
1086 static BlockDriver bdrv_ftps = {
1087     .format_name                = "ftps",
1088     .protocol_name              = "ftps",
1089 
1090     .instance_size              = sizeof(BDRVCURLState),
1091     .bdrv_parse_filename        = curl_parse_filename,
1092     .bdrv_file_open             = curl_open,
1093     .bdrv_close                 = curl_close,
1094     .bdrv_co_getlength          = curl_co_getlength,
1095 
1096     .bdrv_co_preadv             = curl_co_preadv,
1097 
1098     .bdrv_detach_aio_context    = curl_detach_aio_context,
1099     .bdrv_attach_aio_context    = curl_attach_aio_context,
1100 
1101     .bdrv_refresh_filename      = curl_refresh_filename,
1102     .strong_runtime_opts        = curl_strong_runtime_opts,
1103 };
1104 
1105 static void curl_block_init(void)
1106 {
1107     bdrv_register(&bdrv_http);
1108     bdrv_register(&bdrv_https);
1109     bdrv_register(&bdrv_ftp);
1110     bdrv_register(&bdrv_ftps);
1111 }
1112 
1113 block_init(curl_block_init);
1114