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fetch-pack: refactor parsing in get_ack
[git.git] / http.c
blob2b4f6a357c39f3685107da3cf63a9891470a6de9
1 #include "http.h"
2 #include "pack.h"
3 #include "sideband.h"
4 #include "run-command.h"
5 #include "url.h"
6 #include "urlmatch.h"
7 #include "credential.h"
8 #include "version.h"
9 #include "pkt-line.h"
10
11 int active_requests;
12 int http_is_verbose;
13 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
14
15 #if LIBCURL_VERSION_NUM >= 0x070a06
16 #define LIBCURL_CAN_HANDLE_AUTH_ANY
17 #endif
18
19 static int min_curl_sessions = 1;
20 static int curl_session_count;
21 #ifdef USE_CURL_MULTI
22 static int max_requests = -1;
23 static CURLM *curlm;
24 #endif
25 #ifndef NO_CURL_EASY_DUPHANDLE
26 static CURL *curl_default;
27 #endif
28
29 #define PREV_BUF_SIZE 4096
30 #define RANGE_HEADER_SIZE 30
31
32 char curl_errorstr[CURL_ERROR_SIZE];
33
34 static int curl_ssl_verify = -1;
35 static int curl_ssl_try;
36 static const char *ssl_cert;
37 #if LIBCURL_VERSION_NUM >= 0x070903
38 static const char *ssl_key;
39 #endif
40 #if LIBCURL_VERSION_NUM >= 0x070908
41 static const char *ssl_capath;
42 #endif
43 static const char *ssl_cainfo;
44 static long curl_low_speed_limit = -1;
45 static long curl_low_speed_time = -1;
46 static int curl_ftp_no_epsv;
47 static const char *curl_http_proxy;
48 static const char *curl_cookie_file;
49 static int curl_save_cookies;
50 struct credential http_auth = CREDENTIAL_INIT;
51 static int http_proactive_auth;
52 static const char *user_agent;
53
54 #if LIBCURL_VERSION_NUM >= 0x071700
55 /* Use CURLOPT_KEYPASSWD as is */
56 #elif LIBCURL_VERSION_NUM >= 0x070903
57 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
58 #else
59 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
60 #endif
61
62 static struct credential cert_auth = CREDENTIAL_INIT;
63 static int ssl_cert_password_required;
64
65 static struct curl_slist *pragma_header;
66 static struct curl_slist *no_pragma_header;
67
68 static struct active_request_slot *active_queue_head;
69
70 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
71 {
72 size_t size = eltsize * nmemb;
73 struct buffer *buffer = buffer_;
74
75 if (size > buffer->buf.len - buffer->posn)
76 size = buffer->buf.len - buffer->posn;
77 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
78 buffer->posn += size;
79
80 return size;
81 }
82
83 #ifndef NO_CURL_IOCTL
84 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
85 {
86 struct buffer *buffer = clientp;
87
88 switch (cmd) {
89 case CURLIOCMD_NOP:
90 return CURLIOE_OK;
91
92 case CURLIOCMD_RESTARTREAD:
93 buffer->posn = 0;
94 return CURLIOE_OK;
95
96 default:
97 return CURLIOE_UNKNOWNCMD;
98 }
99 }
100 #endif
101
102 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
103 {
104 size_t size = eltsize * nmemb;
105 struct strbuf *buffer = buffer_;
106
107 strbuf_add(buffer, ptr, size);
108 return size;
109 }
110
111 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
112 {
113 return eltsize * nmemb;
114 }
115
116 #ifdef USE_CURL_MULTI
117 static void process_curl_messages(void)
118 {
119 int num_messages;
120 struct active_request_slot *slot;
121 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
122
123 while (curl_message != NULL) {
124 if (curl_message->msg == CURLMSG_DONE) {
125 int curl_result = curl_message->data.result;
126 slot = active_queue_head;
127 while (slot != NULL &&
128 slot->curl != curl_message->easy_handle)
129 slot = slot->next;
130 if (slot != NULL) {
131 curl_multi_remove_handle(curlm, slot->curl);
132 slot->curl_result = curl_result;
133 finish_active_slot(slot);
134 } else {
135 fprintf(stderr, "Received DONE message for unknown request!\n");
136 }
137 } else {
138 fprintf(stderr, "Unknown CURL message received: %d\n",
139 (int)curl_message->msg);
140 }
141 curl_message = curl_multi_info_read(curlm, &num_messages);
142 }
143 }
144 #endif
145
146 static int http_options(const char *var, const char *value, void *cb)
147 {
148 if (!strcmp("http.sslverify", var)) {
149 curl_ssl_verify = git_config_bool(var, value);
150 return 0;
151 }
152 if (!strcmp("http.sslcert", var))
153 return git_config_string(&ssl_cert, var, value);
154 #if LIBCURL_VERSION_NUM >= 0x070903
155 if (!strcmp("http.sslkey", var))
156 return git_config_string(&ssl_key, var, value);
157 #endif
158 #if LIBCURL_VERSION_NUM >= 0x070908
159 if (!strcmp("http.sslcapath", var))
160 return git_config_string(&ssl_capath, var, value);
161 #endif
162 if (!strcmp("http.sslcainfo", var))
163 return git_config_string(&ssl_cainfo, var, value);
164 if (!strcmp("http.sslcertpasswordprotected", var)) {
165 ssl_cert_password_required = git_config_bool(var, value);
166 return 0;
167 }
168 if (!strcmp("http.ssltry", var)) {
169 curl_ssl_try = git_config_bool(var, value);
170 return 0;
171 }
172 if (!strcmp("http.minsessions", var)) {
173 min_curl_sessions = git_config_int(var, value);
174 #ifndef USE_CURL_MULTI
175 if (min_curl_sessions > 1)
176 min_curl_sessions = 1;
177 #endif
178 return 0;
179 }
180 #ifdef USE_CURL_MULTI
181 if (!strcmp("http.maxrequests", var)) {
182 max_requests = git_config_int(var, value);
183 return 0;
184 }
185 #endif
186 if (!strcmp("http.lowspeedlimit", var)) {
187 curl_low_speed_limit = (long)git_config_int(var, value);
188 return 0;
189 }
190 if (!strcmp("http.lowspeedtime", var)) {
191 curl_low_speed_time = (long)git_config_int(var, value);
192 return 0;
193 }
194
195 if (!strcmp("http.noepsv", var)) {
196 curl_ftp_no_epsv = git_config_bool(var, value);
197 return 0;
198 }
199 if (!strcmp("http.proxy", var))
200 return git_config_string(&curl_http_proxy, var, value);
201
202 if (!strcmp("http.cookiefile", var))
203 return git_config_string(&curl_cookie_file, var, value);
204 if (!strcmp("http.savecookies", var)) {
205 curl_save_cookies = git_config_bool(var, value);
206 return 0;
207 }
208
209 if (!strcmp("http.postbuffer", var)) {
210 http_post_buffer = git_config_int(var, value);
211 if (http_post_buffer < LARGE_PACKET_MAX)
212 http_post_buffer = LARGE_PACKET_MAX;
213 return 0;
214 }
215
216 if (!strcmp("http.useragent", var))
217 return git_config_string(&user_agent, var, value);
218
219 /* Fall back on the default ones */
220 return git_default_config(var, value, cb);
221 }
222
223 static void init_curl_http_auth(CURL *result)
224 {
225 if (!http_auth.username)
226 return;
227
228 credential_fill(&http_auth);
229
230 #if LIBCURL_VERSION_NUM >= 0x071301
231 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
232 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
233 #else
234 {
235 static struct strbuf up = STRBUF_INIT;
236 /*
237 * Note that we assume we only ever have a single set of
238 * credentials in a given program run, so we do not have
239 * to worry about updating this buffer, only setting its
240 * initial value.
241 */
242 if (!up.len)
243 strbuf_addf(&up, "%s:%s",
244 http_auth.username, http_auth.password);
245 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
246 }
247 #endif
248 }
249
250 static int has_cert_password(void)
251 {
252 if (ssl_cert == NULL || ssl_cert_password_required != 1)
253 return 0;
254 if (!cert_auth.password) {
255 cert_auth.protocol = xstrdup("cert");
256 cert_auth.username = xstrdup("");
257 cert_auth.path = xstrdup(ssl_cert);
258 credential_fill(&cert_auth);
259 }
260 return 1;
261 }
262
263 #if LIBCURL_VERSION_NUM >= 0x071900
264 static void set_curl_keepalive(CURL *c)
265 {
266 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
267 }
268
269 #elif LIBCURL_VERSION_NUM >= 0x071000
270 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
271 {
272 int ka = 1;
273 int rc;
274 socklen_t len = (socklen_t)sizeof(ka);
275
276 if (type != CURLSOCKTYPE_IPCXN)
277 return 0;
278
279 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
280 if (rc < 0)
281 warning("unable to set SO_KEEPALIVE on socket %s",
282 strerror(errno));
283
284 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
285 }
286
287 static void set_curl_keepalive(CURL *c)
288 {
289 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
290 }
291
292 #else
293 static void set_curl_keepalive(CURL *c)
294 {
295 /* not supported on older curl versions */
296 }
297 #endif
298
299 static CURL *get_curl_handle(void)
300 {
301 CURL *result = curl_easy_init();
302
303 if (!curl_ssl_verify) {
304 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
305 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
306 } else {
307 /* Verify authenticity of the peer's certificate */
308 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
309 /* The name in the cert must match whom we tried to connect */
310 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
311 }
312
313 #if LIBCURL_VERSION_NUM >= 0x070907
314 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
315 #endif
316 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
317 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
318 #endif
319
320 if (http_proactive_auth)
321 init_curl_http_auth(result);
322
323 if (ssl_cert != NULL)
324 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
325 if (has_cert_password())
326 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
327 #if LIBCURL_VERSION_NUM >= 0x070903
328 if (ssl_key != NULL)
329 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
330 #endif
331 #if LIBCURL_VERSION_NUM >= 0x070908
332 if (ssl_capath != NULL)
333 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
334 #endif
335 if (ssl_cainfo != NULL)
336 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
337
338 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
339 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
340 curl_low_speed_limit);
341 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
342 curl_low_speed_time);
343 }
344
345 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
346 #if LIBCURL_VERSION_NUM >= 0x071301
347 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
348 #elif LIBCURL_VERSION_NUM >= 0x071101
349 curl_easy_setopt(result, CURLOPT_POST301, 1);
350 #endif
351
352 if (getenv("GIT_CURL_VERBOSE"))
353 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
354
355 curl_easy_setopt(result, CURLOPT_USERAGENT,
356 user_agent ? user_agent : git_user_agent());
357
358 if (curl_ftp_no_epsv)
359 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
360
361 #ifdef CURLOPT_USE_SSL
362 if (curl_ssl_try)
363 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
364 #endif
365
366 if (curl_http_proxy) {
367 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
368 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
369 }
370
371 set_curl_keepalive(result);
372
373 return result;
374 }
375
376 static void set_from_env(const char **var, const char *envname)
377 {
378 const char *val = getenv(envname);
379 if (val)
380 *var = val;
381 }
382
383 void http_init(struct remote *remote, const char *url, int proactive_auth)
384 {
385 char *low_speed_limit;
386 char *low_speed_time;
387 char *normalized_url;
388 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
389
390 config.section = "http";
391 config.key = NULL;
392 config.collect_fn = http_options;
393 config.cascade_fn = git_default_config;
394 config.cb = NULL;
395
396 http_is_verbose = 0;
397 normalized_url = url_normalize(url, &config.url);
398
399 git_config(urlmatch_config_entry, &config);
400 free(normalized_url);
401
402 curl_global_init(CURL_GLOBAL_ALL);
403
404 http_proactive_auth = proactive_auth;
405
406 if (remote && remote->http_proxy)
407 curl_http_proxy = xstrdup(remote->http_proxy);
408
409 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
410 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
411
412 #ifdef USE_CURL_MULTI
413 {
414 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
415 if (http_max_requests != NULL)
416 max_requests = atoi(http_max_requests);
417 }
418
419 curlm = curl_multi_init();
420 if (curlm == NULL) {
421 fprintf(stderr, "Error creating curl multi handle.\n");
422 exit(1);
423 }
424 #endif
425
426 if (getenv("GIT_SSL_NO_VERIFY"))
427 curl_ssl_verify = 0;
428
429 set_from_env(&ssl_cert, "GIT_SSL_CERT");
430 #if LIBCURL_VERSION_NUM >= 0x070903
431 set_from_env(&ssl_key, "GIT_SSL_KEY");
432 #endif
433 #if LIBCURL_VERSION_NUM >= 0x070908
434 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
435 #endif
436 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
437
438 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
439
440 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
441 if (low_speed_limit != NULL)
442 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
443 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
444 if (low_speed_time != NULL)
445 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
446
447 if (curl_ssl_verify == -1)
448 curl_ssl_verify = 1;
449
450 curl_session_count = 0;
451 #ifdef USE_CURL_MULTI
452 if (max_requests < 1)
453 max_requests = DEFAULT_MAX_REQUESTS;
454 #endif
455
456 if (getenv("GIT_CURL_FTP_NO_EPSV"))
457 curl_ftp_no_epsv = 1;
458
459 if (url) {
460 credential_from_url(&http_auth, url);
461 if (!ssl_cert_password_required &&
462 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
463 starts_with(url, "https://"))
464 ssl_cert_password_required = 1;
465 }
466
467 #ifndef NO_CURL_EASY_DUPHANDLE
468 curl_default = get_curl_handle();
469 #endif
470 }
471
472 void http_cleanup(void)
473 {
474 struct active_request_slot *slot = active_queue_head;
475
476 while (slot != NULL) {
477 struct active_request_slot *next = slot->next;
478 if (slot->curl != NULL) {
479 #ifdef USE_CURL_MULTI
480 curl_multi_remove_handle(curlm, slot->curl);
481 #endif
482 curl_easy_cleanup(slot->curl);
483 }
484 free(slot);
485 slot = next;
486 }
487 active_queue_head = NULL;
488
489 #ifndef NO_CURL_EASY_DUPHANDLE
490 curl_easy_cleanup(curl_default);
491 #endif
492
493 #ifdef USE_CURL_MULTI
494 curl_multi_cleanup(curlm);
495 #endif
496 curl_global_cleanup();
497
498 curl_slist_free_all(pragma_header);
499 pragma_header = NULL;
500
501 curl_slist_free_all(no_pragma_header);
502 no_pragma_header = NULL;
503
504 if (curl_http_proxy) {
505 free((void *)curl_http_proxy);
506 curl_http_proxy = NULL;
507 }
508
509 if (cert_auth.password != NULL) {
510 memset(cert_auth.password, 0, strlen(cert_auth.password));
511 free(cert_auth.password);
512 cert_auth.password = NULL;
513 }
514 ssl_cert_password_required = 0;
515 }
516
517 struct active_request_slot *get_active_slot(void)
518 {
519 struct active_request_slot *slot = active_queue_head;
520 struct active_request_slot *newslot;
521
522 #ifdef USE_CURL_MULTI
523 int num_transfers;
524
525 /* Wait for a slot to open up if the queue is full */
526 while (active_requests >= max_requests) {
527 curl_multi_perform(curlm, &num_transfers);
528 if (num_transfers < active_requests)
529 process_curl_messages();
530 }
531 #endif
532
533 while (slot != NULL && slot->in_use)
534 slot = slot->next;
535
536 if (slot == NULL) {
537 newslot = xmalloc(sizeof(*newslot));
538 newslot->curl = NULL;
539 newslot->in_use = 0;
540 newslot->next = NULL;
541
542 slot = active_queue_head;
543 if (slot == NULL) {
544 active_queue_head = newslot;
545 } else {
546 while (slot->next != NULL)
547 slot = slot->next;
548 slot->next = newslot;
549 }
550 slot = newslot;
551 }
552
553 if (slot->curl == NULL) {
554 #ifdef NO_CURL_EASY_DUPHANDLE
555 slot->curl = get_curl_handle();
556 #else
557 slot->curl = curl_easy_duphandle(curl_default);
558 #endif
559 curl_session_count++;
560 }
561
562 active_requests++;
563 slot->in_use = 1;
564 slot->results = NULL;
565 slot->finished = NULL;
566 slot->callback_data = NULL;
567 slot->callback_func = NULL;
568 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
569 if (curl_save_cookies)
570 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
571 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
572 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
573 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
574 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
575 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
576 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
577 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
578 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
579 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
580 if (http_auth.password)
581 init_curl_http_auth(slot->curl);
582
583 return slot;
584 }
585
586 int start_active_slot(struct active_request_slot *slot)
587 {
588 #ifdef USE_CURL_MULTI
589 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
590 int num_transfers;
591
592 if (curlm_result != CURLM_OK &&
593 curlm_result != CURLM_CALL_MULTI_PERFORM) {
594 active_requests--;
595 slot->in_use = 0;
596 return 0;
597 }
598
599 /*
600 * We know there must be something to do, since we just added
601 * something.
602 */
603 curl_multi_perform(curlm, &num_transfers);
604 #endif
605 return 1;
606 }
607
608 #ifdef USE_CURL_MULTI
609 struct fill_chain {
610 void *data;
611 int (*fill)(void *);
612 struct fill_chain *next;
613 };
614
615 static struct fill_chain *fill_cfg;
616
617 void add_fill_function(void *data, int (*fill)(void *))
618 {
619 struct fill_chain *new = xmalloc(sizeof(*new));
620 struct fill_chain **linkp = &fill_cfg;
621 new->data = data;
622 new->fill = fill;
623 new->next = NULL;
624 while (*linkp)
625 linkp = &(*linkp)->next;
626 *linkp = new;
627 }
628
629 void fill_active_slots(void)
630 {
631 struct active_request_slot *slot = active_queue_head;
632
633 while (active_requests < max_requests) {
634 struct fill_chain *fill;
635 for (fill = fill_cfg; fill; fill = fill->next)
636 if (fill->fill(fill->data))
637 break;
638
639 if (!fill)
640 break;
641 }
642
643 while (slot != NULL) {
644 if (!slot->in_use && slot->curl != NULL
645 && curl_session_count > min_curl_sessions) {
646 curl_easy_cleanup(slot->curl);
647 slot->curl = NULL;
648 curl_session_count--;
649 }
650 slot = slot->next;
651 }
652 }
653
654 void step_active_slots(void)
655 {
656 int num_transfers;
657 CURLMcode curlm_result;
658
659 do {
660 curlm_result = curl_multi_perform(curlm, &num_transfers);
661 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
662 if (num_transfers < active_requests) {
663 process_curl_messages();
664 fill_active_slots();
665 }
666 }
667 #endif
668
669 void run_active_slot(struct active_request_slot *slot)
670 {
671 #ifdef USE_CURL_MULTI
672 fd_set readfds;
673 fd_set writefds;
674 fd_set excfds;
675 int max_fd;
676 struct timeval select_timeout;
677 int finished = 0;
678
679 slot->finished = &finished;
680 while (!finished) {
681 step_active_slots();
682
683 if (slot->in_use) {
684 #if LIBCURL_VERSION_NUM >= 0x070f04
685 long curl_timeout;
686 curl_multi_timeout(curlm, &curl_timeout);
687 if (curl_timeout == 0) {
688 continue;
689 } else if (curl_timeout == -1) {
690 select_timeout.tv_sec = 0;
691 select_timeout.tv_usec = 50000;
692 } else {
693 select_timeout.tv_sec = curl_timeout / 1000;
694 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
695 }
696 #else
697 select_timeout.tv_sec = 0;
698 select_timeout.tv_usec = 50000;
699 #endif
700
701 max_fd = -1;
702 FD_ZERO(&readfds);
703 FD_ZERO(&writefds);
704 FD_ZERO(&excfds);
705 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
706
707 /*
708 * It can happen that curl_multi_timeout returns a pathologically
709 * long timeout when curl_multi_fdset returns no file descriptors
710 * to read. See commit message for more details.
711 */
712 if (max_fd < 0 &&
713 (select_timeout.tv_sec > 0 ||
714 select_timeout.tv_usec > 50000)) {
715 select_timeout.tv_sec = 0;
716 select_timeout.tv_usec = 50000;
717 }
718
719 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
720 }
721 }
722 #else
723 while (slot->in_use) {
724 slot->curl_result = curl_easy_perform(slot->curl);
725 finish_active_slot(slot);
726 }
727 #endif
728 }
729
730 static void closedown_active_slot(struct active_request_slot *slot)
731 {
732 active_requests--;
733 slot->in_use = 0;
734 }
735
736 static void release_active_slot(struct active_request_slot *slot)
737 {
738 closedown_active_slot(slot);
739 if (slot->curl && curl_session_count > min_curl_sessions) {
740 #ifdef USE_CURL_MULTI
741 curl_multi_remove_handle(curlm, slot->curl);
742 #endif
743 curl_easy_cleanup(slot->curl);
744 slot->curl = NULL;
745 curl_session_count--;
746 }
747 #ifdef USE_CURL_MULTI
748 fill_active_slots();
749 #endif
750 }
751
752 void finish_active_slot(struct active_request_slot *slot)
753 {
754 closedown_active_slot(slot);
755 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
756
757 if (slot->finished != NULL)
758 (*slot->finished) = 1;
759
760 /* Store slot results so they can be read after the slot is reused */
761 if (slot->results != NULL) {
762 slot->results->curl_result = slot->curl_result;
763 slot->results->http_code = slot->http_code;
764 #if LIBCURL_VERSION_NUM >= 0x070a08
765 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
766 &slot->results->auth_avail);
767 #else
768 slot->results->auth_avail = 0;
769 #endif
770 }
771
772 /* Run callback if appropriate */
773 if (slot->callback_func != NULL)
774 slot->callback_func(slot->callback_data);
775 }
776
777 void finish_all_active_slots(void)
778 {
779 struct active_request_slot *slot = active_queue_head;
780
781 while (slot != NULL)
782 if (slot->in_use) {
783 run_active_slot(slot);
784 slot = active_queue_head;
785 } else {
786 slot = slot->next;
787 }
788 }
789
790 /* Helpers for modifying and creating URLs */
791 static inline int needs_quote(int ch)
792 {
793 if (((ch >= 'A') && (ch <= 'Z'))
794 || ((ch >= 'a') && (ch <= 'z'))
795 || ((ch >= '0') && (ch <= '9'))
796 || (ch == '/')
797 || (ch == '-')
798 || (ch == '.'))
799 return 0;
800 return 1;
801 }
802
803 static char *quote_ref_url(const char *base, const char *ref)
804 {
805 struct strbuf buf = STRBUF_INIT;
806 const char *cp;
807 int ch;
808
809 end_url_with_slash(&buf, base);
810
811 for (cp = ref; (ch = *cp) != 0; cp++)
812 if (needs_quote(ch))
813 strbuf_addf(&buf, "%%%02x", ch);
814 else
815 strbuf_addch(&buf, *cp);
816
817 return strbuf_detach(&buf, NULL);
818 }
819
820 void append_remote_object_url(struct strbuf *buf, const char *url,
821 const char *hex,
822 int only_two_digit_prefix)
823 {
824 end_url_with_slash(buf, url);
825
826 strbuf_addf(buf, "objects/%.*s/", 2, hex);
827 if (!only_two_digit_prefix)
828 strbuf_addf(buf, "%s", hex+2);
829 }
830
831 char *get_remote_object_url(const char *url, const char *hex,
832 int only_two_digit_prefix)
833 {
834 struct strbuf buf = STRBUF_INIT;
835 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
836 return strbuf_detach(&buf, NULL);
837 }
838
839 int handle_curl_result(struct slot_results *results)
840 {
841 /*
842 * If we see a failing http code with CURLE_OK, we have turned off
843 * FAILONERROR (to keep the server's custom error response), and should
844 * translate the code into failure here.
845 */
846 if (results->curl_result == CURLE_OK &&
847 results->http_code >= 400) {
848 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
849 /*
850 * Normally curl will already have put the "reason phrase"
851 * from the server into curl_errorstr; unfortunately without
852 * FAILONERROR it is lost, so we can give only the numeric
853 * status code.
854 */
855 snprintf(curl_errorstr, sizeof(curl_errorstr),
856 "The requested URL returned error: %ld",
857 results->http_code);
858 }
859
860 if (results->curl_result == CURLE_OK) {
861 credential_approve(&http_auth);
862 return HTTP_OK;
863 } else if (missing_target(results))
864 return HTTP_MISSING_TARGET;
865 else if (results->http_code == 401) {
866 if (http_auth.username && http_auth.password) {
867 credential_reject(&http_auth);
868 return HTTP_NOAUTH;
869 } else {
870 return HTTP_REAUTH;
871 }
872 } else {
873 #if LIBCURL_VERSION_NUM >= 0x070c00
874 if (!curl_errorstr[0])
875 strlcpy(curl_errorstr,
876 curl_easy_strerror(results->curl_result),
877 sizeof(curl_errorstr));
878 #endif
879 return HTTP_ERROR;
880 }
881 }
882
883 int run_one_slot(struct active_request_slot *slot,
884 struct slot_results *results)
885 {
886 slot->results = results;
887 if (!start_active_slot(slot)) {
888 snprintf(curl_errorstr, sizeof(curl_errorstr),
889 "failed to start HTTP request");
890 return HTTP_START_FAILED;
891 }
892
893 run_active_slot(slot);
894 return handle_curl_result(results);
895 }
896
897 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
898 {
899 char *ptr;
900 CURLcode ret;
901
902 strbuf_reset(buf);
903 ret = curl_easy_getinfo(curl, info, &ptr);
904 if (!ret && ptr)
905 strbuf_addstr(buf, ptr);
906 return ret;
907 }
908
909 /*
910 * Check for and extract a content-type parameter. "raw"
911 * should be positioned at the start of the potential
912 * parameter, with any whitespace already removed.
913 *
914 * "name" is the name of the parameter. The value is appended
915 * to "out".
916 */
917 static int extract_param(const char *raw, const char *name,
918 struct strbuf *out)
919 {
920 size_t len = strlen(name);
921
922 if (strncasecmp(raw, name, len))
923 return -1;
924 raw += len;
925
926 if (*raw != '=')
927 return -1;
928 raw++;
929
930 while (*raw && !isspace(*raw))
931 strbuf_addch(out, *raw++);
932 return 0;
933 }
934
935 /*
936 * Extract a normalized version of the content type, with any
937 * spaces suppressed, all letters lowercased, and no trailing ";"
938 * or parameters.
939 *
940 * Note that we will silently remove even invalid whitespace. For
941 * example, "text / plain" is specifically forbidden by RFC 2616,
942 * but "text/plain" is the only reasonable output, and this keeps
943 * our code simple.
944 *
945 * If the "charset" argument is not NULL, store the value of any
946 * charset parameter there.
947 *
948 * Example:
949 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
950 * "text / plain" -> "text/plain"
951 */
952 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
953 struct strbuf *charset)
954 {
955 const char *p;
956
957 strbuf_reset(type);
958 strbuf_grow(type, raw->len);
959 for (p = raw->buf; *p; p++) {
960 if (isspace(*p))
961 continue;
962 if (*p == ';') {
963 p++;
964 break;
965 }
966 strbuf_addch(type, tolower(*p));
967 }
968
969 if (!charset)
970 return;
971
972 strbuf_reset(charset);
973 while (*p) {
974 while (isspace(*p))
975 p++;
976 if (!extract_param(p, "charset", charset))
977 return;
978 while (*p && !isspace(*p))
979 p++;
980 }
981
982 if (!charset->len && starts_with(type->buf, "text/"))
983 strbuf_addstr(charset, "ISO-8859-1");
984 }
985
986 /* http_request() targets */
987 #define HTTP_REQUEST_STRBUF 0
988 #define HTTP_REQUEST_FILE 1
989
990 static int http_request(const char *url,
991 void *result, int target,
992 const struct http_get_options *options)
993 {
994 struct active_request_slot *slot;
995 struct slot_results results;
996 struct curl_slist *headers = NULL;
997 struct strbuf buf = STRBUF_INIT;
998 int ret;
999
1000 slot = get_active_slot();
1001 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1002
1003 if (result == NULL) {
1004 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1005 } else {
1006 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1007 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1008
1009 if (target == HTTP_REQUEST_FILE) {
1010 long posn = ftell(result);
1011 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1012 fwrite);
1013 if (posn > 0) {
1014 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1015 headers = curl_slist_append(headers, buf.buf);
1016 strbuf_reset(&buf);
1017 }
1018 } else
1019 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1020 fwrite_buffer);
1021 }
1022
1023 strbuf_addstr(&buf, "Pragma:");
1024 if (options && options->no_cache)
1025 strbuf_addstr(&buf, " no-cache");
1026 if (options && options->keep_error)
1027 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1028
1029 headers = curl_slist_append(headers, buf.buf);
1030
1031 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1032 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1033 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1034
1035 ret = run_one_slot(slot, &results);
1036
1037 if (options && options->content_type) {
1038 struct strbuf raw = STRBUF_INIT;
1039 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1040 extract_content_type(&raw, options->content_type,
1041 options->charset);
1042 strbuf_release(&raw);
1043 }
1044
1045 if (options && options->effective_url)
1046 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1047 options->effective_url);
1048
1049 curl_slist_free_all(headers);
1050 strbuf_release(&buf);
1051
1052 return ret;
1053 }
1054
1055 /*
1056 * Update the "base" url to a more appropriate value, as deduced by
1057 * redirects seen when requesting a URL starting with "url".
1058 *
1059 * The "asked" parameter is a URL that we asked curl to access, and must begin
1060 * with "base".
1061 *
1062 * The "got" parameter is the URL that curl reported to us as where we ended
1063 * up.
1064 *
1065 * Returns 1 if we updated the base url, 0 otherwise.
1066 *
1067 * Our basic strategy is to compare "base" and "asked" to find the bits
1068 * specific to our request. We then strip those bits off of "got" to yield the
1069 * new base. So for example, if our base is "http://example.com/foo.git",
1070 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1071 * with "https://other.example.com/foo.git/info/refs". We would want the
1072 * new URL to become "https://other.example.com/foo.git".
1073 *
1074 * Note that this assumes a sane redirect scheme. It's entirely possible
1075 * in the example above to end up at a URL that does not even end in
1076 * "info/refs". In such a case we simply punt, as there is not much we can
1077 * do (and such a scheme is unlikely to represent a real git repository,
1078 * which means we are likely about to abort anyway).
1079 */
1080 static int update_url_from_redirect(struct strbuf *base,
1081 const char *asked,
1082 const struct strbuf *got)
1083 {
1084 const char *tail;
1085 size_t tail_len;
1086
1087 if (!strcmp(asked, got->buf))
1088 return 0;
1089
1090 if (!starts_with(asked, base->buf))
1091 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1092 asked, base->buf);
1093
1094 tail = asked + base->len;
1095 tail_len = strlen(tail);
1096
1097 if (got->len < tail_len ||
1098 strcmp(tail, got->buf + got->len - tail_len))
1099 return 0; /* insane redirect scheme */
1100
1101 strbuf_reset(base);
1102 strbuf_add(base, got->buf, got->len - tail_len);
1103 return 1;
1104 }
1105
1106 static int http_request_reauth(const char *url,
1107 void *result, int target,
1108 struct http_get_options *options)
1109 {
1110 int ret = http_request(url, result, target, options);
1111
1112 if (options && options->effective_url && options->base_url) {
1113 if (update_url_from_redirect(options->base_url,
1114 url, options->effective_url)) {
1115 credential_from_url(&http_auth, options->base_url->buf);
1116 url = options->effective_url->buf;
1117 }
1118 }
1119
1120 if (ret != HTTP_REAUTH)
1121 return ret;
1122
1123 /*
1124 * If we are using KEEP_ERROR, the previous request may have
1125 * put cruft into our output stream; we should clear it out before
1126 * making our next request. We only know how to do this for
1127 * the strbuf case, but that is enough to satisfy current callers.
1128 */
1129 if (options && options->keep_error) {
1130 switch (target) {
1131 case HTTP_REQUEST_STRBUF:
1132 strbuf_reset(result);
1133 break;
1134 default:
1135 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1136 }
1137 }
1138
1139 credential_fill(&http_auth);
1140
1141 return http_request(url, result, target, options);
1142 }
1143
1144 int http_get_strbuf(const char *url,
1145 struct strbuf *result,
1146 struct http_get_options *options)
1147 {
1148 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1149 }
1150
1151 /*
1152 * Downloads a URL and stores the result in the given file.
1153 *
1154 * If a previous interrupted download is detected (i.e. a previous temporary
1155 * file is still around) the download is resumed.
1156 */
1157 static int http_get_file(const char *url, const char *filename,
1158 struct http_get_options *options)
1159 {
1160 int ret;
1161 struct strbuf tmpfile = STRBUF_INIT;
1162 FILE *result;
1163
1164 strbuf_addf(&tmpfile, "%s.temp", filename);
1165 result = fopen(tmpfile.buf, "a");
1166 if (!result) {
1167 error("Unable to open local file %s", tmpfile.buf);
1168 ret = HTTP_ERROR;
1169 goto cleanup;
1170 }
1171
1172 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1173 fclose(result);
1174
1175 if (ret == HTTP_OK && move_temp_to_file(tmpfile.buf, filename))
1176 ret = HTTP_ERROR;
1177 cleanup:
1178 strbuf_release(&tmpfile);
1179 return ret;
1180 }
1181
1182 int http_fetch_ref(const char *base, struct ref *ref)
1183 {
1184 struct http_get_options options = {0};
1185 char *url;
1186 struct strbuf buffer = STRBUF_INIT;
1187 int ret = -1;
1188
1189 options.no_cache = 1;
1190
1191 url = quote_ref_url(base, ref->name);
1192 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1193 strbuf_rtrim(&buffer);
1194 if (buffer.len == 40)
1195 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1196 else if (starts_with(buffer.buf, "ref: ")) {
1197 ref->symref = xstrdup(buffer.buf + 5);
1198 ret = 0;
1199 }
1200 }
1201
1202 strbuf_release(&buffer);
1203 free(url);
1204 return ret;
1205 }
1206
1207 /* Helpers for fetching packs */
1208 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1209 {
1210 char *url, *tmp;
1211 struct strbuf buf = STRBUF_INIT;
1212
1213 if (http_is_verbose)
1214 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1215
1216 end_url_with_slash(&buf, base_url);
1217 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1218 url = strbuf_detach(&buf, NULL);
1219
1220 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1221 tmp = strbuf_detach(&buf, NULL);
1222
1223 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1224 error("Unable to get pack index %s", url);
1225 free(tmp);
1226 tmp = NULL;
1227 }
1228
1229 free(url);
1230 return tmp;
1231 }
1232
1233 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1234 unsigned char *sha1, const char *base_url)
1235 {
1236 struct packed_git *new_pack;
1237 char *tmp_idx = NULL;
1238 int ret;
1239
1240 if (has_pack_index(sha1)) {
1241 new_pack = parse_pack_index(sha1, NULL);
1242 if (!new_pack)
1243 return -1; /* parse_pack_index() already issued error message */
1244 goto add_pack;
1245 }
1246
1247 tmp_idx = fetch_pack_index(sha1, base_url);
1248 if (!tmp_idx)
1249 return -1;
1250
1251 new_pack = parse_pack_index(sha1, tmp_idx);
1252 if (!new_pack) {
1253 unlink(tmp_idx);
1254 free(tmp_idx);
1255
1256 return -1; /* parse_pack_index() already issued error message */
1257 }
1258
1259 ret = verify_pack_index(new_pack);
1260 if (!ret) {
1261 close_pack_index(new_pack);
1262 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1263 }
1264 free(tmp_idx);
1265 if (ret)
1266 return -1;
1267
1268 add_pack:
1269 new_pack->next = *packs_head;
1270 *packs_head = new_pack;
1271 return 0;
1272 }
1273
1274 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1275 {
1276 struct http_get_options options = {0};
1277 int ret = 0, i = 0;
1278 char *url, *data;
1279 struct strbuf buf = STRBUF_INIT;
1280 unsigned char sha1[20];
1281
1282 end_url_with_slash(&buf, base_url);
1283 strbuf_addstr(&buf, "objects/info/packs");
1284 url = strbuf_detach(&buf, NULL);
1285
1286 options.no_cache = 1;
1287 ret = http_get_strbuf(url, &buf, &options);
1288 if (ret != HTTP_OK)
1289 goto cleanup;
1290
1291 data = buf.buf;
1292 while (i < buf.len) {
1293 switch (data[i]) {
1294 case 'P':
1295 i++;
1296 if (i + 52 <= buf.len &&
1297 starts_with(data + i, " pack-") &&
1298 starts_with(data + i + 46, ".pack\n")) {
1299 get_sha1_hex(data + i + 6, sha1);
1300 fetch_and_setup_pack_index(packs_head, sha1,
1301 base_url);
1302 i += 51;
1303 break;
1304 }
1305 default:
1306 while (i < buf.len && data[i] != '\n')
1307 i++;
1308 }
1309 i++;
1310 }
1311
1312 cleanup:
1313 free(url);
1314 return ret;
1315 }
1316
1317 void release_http_pack_request(struct http_pack_request *preq)
1318 {
1319 if (preq->packfile != NULL) {
1320 fclose(preq->packfile);
1321 preq->packfile = NULL;
1322 }
1323 if (preq->range_header != NULL) {
1324 curl_slist_free_all(preq->range_header);
1325 preq->range_header = NULL;
1326 }
1327 preq->slot = NULL;
1328 free(preq->url);
1329 }
1330
1331 int finish_http_pack_request(struct http_pack_request *preq)
1332 {
1333 struct packed_git **lst;
1334 struct packed_git *p = preq->target;
1335 char *tmp_idx;
1336 struct child_process ip;
1337 const char *ip_argv[8];
1338
1339 close_pack_index(p);
1340
1341 fclose(preq->packfile);
1342 preq->packfile = NULL;
1343
1344 lst = preq->lst;
1345 while (*lst != p)
1346 lst = &((*lst)->next);
1347 *lst = (*lst)->next;
1348
1349 tmp_idx = xstrdup(preq->tmpfile);
1350 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1351 ".idx.temp");
1352
1353 ip_argv[0] = "index-pack";
1354 ip_argv[1] = "-o";
1355 ip_argv[2] = tmp_idx;
1356 ip_argv[3] = preq->tmpfile;
1357 ip_argv[4] = NULL;
1358
1359 memset(&ip, 0, sizeof(ip));
1360 ip.argv = ip_argv;
1361 ip.git_cmd = 1;
1362 ip.no_stdin = 1;
1363 ip.no_stdout = 1;
1364
1365 if (run_command(&ip)) {
1366 unlink(preq->tmpfile);
1367 unlink(tmp_idx);
1368 free(tmp_idx);
1369 return -1;
1370 }
1371
1372 unlink(sha1_pack_index_name(p->sha1));
1373
1374 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1375 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1376 free(tmp_idx);
1377 return -1;
1378 }
1379
1380 install_packed_git(p);
1381 free(tmp_idx);
1382 return 0;
1383 }
1384
1385 struct http_pack_request *new_http_pack_request(
1386 struct packed_git *target, const char *base_url)
1387 {
1388 long prev_posn = 0;
1389 char range[RANGE_HEADER_SIZE];
1390 struct strbuf buf = STRBUF_INIT;
1391 struct http_pack_request *preq;
1392
1393 preq = xcalloc(1, sizeof(*preq));
1394 preq->target = target;
1395
1396 end_url_with_slash(&buf, base_url);
1397 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1398 sha1_to_hex(target->sha1));
1399 preq->url = strbuf_detach(&buf, NULL);
1400
1401 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1402 sha1_pack_name(target->sha1));
1403 preq->packfile = fopen(preq->tmpfile, "a");
1404 if (!preq->packfile) {
1405 error("Unable to open local file %s for pack",
1406 preq->tmpfile);
1407 goto abort;
1408 }
1409
1410 preq->slot = get_active_slot();
1411 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1412 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1413 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1414 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1415 no_pragma_header);
1416
1417 /*
1418 * If there is data present from a previous transfer attempt,
1419 * resume where it left off
1420 */
1421 prev_posn = ftell(preq->packfile);
1422 if (prev_posn>0) {
1423 if (http_is_verbose)
1424 fprintf(stderr,
1425 "Resuming fetch of pack %s at byte %ld\n",
1426 sha1_to_hex(target->sha1), prev_posn);
1427 sprintf(range, "Range: bytes=%ld-", prev_posn);
1428 preq->range_header = curl_slist_append(NULL, range);
1429 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1430 preq->range_header);
1431 }
1432
1433 return preq;
1434
1435 abort:
1436 free(preq->url);
1437 free(preq);
1438 return NULL;
1439 }
1440
1441 /* Helpers for fetching objects (loose) */
1442 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1443 void *data)
1444 {
1445 unsigned char expn[4096];
1446 size_t size = eltsize * nmemb;
1447 int posn = 0;
1448 struct http_object_request *freq =
1449 (struct http_object_request *)data;
1450 do {
1451 ssize_t retval = xwrite(freq->localfile,
1452 (char *) ptr + posn, size - posn);
1453 if (retval < 0)
1454 return posn;
1455 posn += retval;
1456 } while (posn < size);
1457
1458 freq->stream.avail_in = size;
1459 freq->stream.next_in = (void *)ptr;
1460 do {
1461 freq->stream.next_out = expn;
1462 freq->stream.avail_out = sizeof(expn);
1463 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1464 git_SHA1_Update(&freq->c, expn,
1465 sizeof(expn) - freq->stream.avail_out);
1466 } while (freq->stream.avail_in && freq->zret == Z_OK);
1467 return size;
1468 }
1469
1470 struct http_object_request *new_http_object_request(const char *base_url,
1471 unsigned char *sha1)
1472 {
1473 char *hex = sha1_to_hex(sha1);
1474 const char *filename;
1475 char prevfile[PATH_MAX];
1476 int prevlocal;
1477 char prev_buf[PREV_BUF_SIZE];
1478 ssize_t prev_read = 0;
1479 long prev_posn = 0;
1480 char range[RANGE_HEADER_SIZE];
1481 struct curl_slist *range_header = NULL;
1482 struct http_object_request *freq;
1483
1484 freq = xcalloc(1, sizeof(*freq));
1485 hashcpy(freq->sha1, sha1);
1486 freq->localfile = -1;
1487
1488 filename = sha1_file_name(sha1);
1489 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1490 "%s.temp", filename);
1491
1492 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1493 unlink_or_warn(prevfile);
1494 rename(freq->tmpfile, prevfile);
1495 unlink_or_warn(freq->tmpfile);
1496
1497 if (freq->localfile != -1)
1498 error("fd leakage in start: %d", freq->localfile);
1499 freq->localfile = open(freq->tmpfile,
1500 O_WRONLY | O_CREAT | O_EXCL, 0666);
1501 /*
1502 * This could have failed due to the "lazy directory creation";
1503 * try to mkdir the last path component.
1504 */
1505 if (freq->localfile < 0 && errno == ENOENT) {
1506 char *dir = strrchr(freq->tmpfile, '/');
1507 if (dir) {
1508 *dir = 0;
1509 mkdir(freq->tmpfile, 0777);
1510 *dir = '/';
1511 }
1512 freq->localfile = open(freq->tmpfile,
1513 O_WRONLY | O_CREAT | O_EXCL, 0666);
1514 }
1515
1516 if (freq->localfile < 0) {
1517 error("Couldn't create temporary file %s: %s",
1518 freq->tmpfile, strerror(errno));
1519 goto abort;
1520 }
1521
1522 git_inflate_init(&freq->stream);
1523
1524 git_SHA1_Init(&freq->c);
1525
1526 freq->url = get_remote_object_url(base_url, hex, 0);
1527
1528 /*
1529 * If a previous temp file is present, process what was already
1530 * fetched.
1531 */
1532 prevlocal = open(prevfile, O_RDONLY);
1533 if (prevlocal != -1) {
1534 do {
1535 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1536 if (prev_read>0) {
1537 if (fwrite_sha1_file(prev_buf,
1538 1,
1539 prev_read,
1540 freq) == prev_read) {
1541 prev_posn += prev_read;
1542 } else {
1543 prev_read = -1;
1544 }
1545 }
1546 } while (prev_read > 0);
1547 close(prevlocal);
1548 }
1549 unlink_or_warn(prevfile);
1550
1551 /*
1552 * Reset inflate/SHA1 if there was an error reading the previous temp
1553 * file; also rewind to the beginning of the local file.
1554 */
1555 if (prev_read == -1) {
1556 memset(&freq->stream, 0, sizeof(freq->stream));
1557 git_inflate_init(&freq->stream);
1558 git_SHA1_Init(&freq->c);
1559 if (prev_posn>0) {
1560 prev_posn = 0;
1561 lseek(freq->localfile, 0, SEEK_SET);
1562 if (ftruncate(freq->localfile, 0) < 0) {
1563 error("Couldn't truncate temporary file %s: %s",
1564 freq->tmpfile, strerror(errno));
1565 goto abort;
1566 }
1567 }
1568 }
1569
1570 freq->slot = get_active_slot();
1571
1572 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1573 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1574 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1575 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1576 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1577
1578 /*
1579 * If we have successfully processed data from a previous fetch
1580 * attempt, only fetch the data we don't already have.
1581 */
1582 if (prev_posn>0) {
1583 if (http_is_verbose)
1584 fprintf(stderr,
1585 "Resuming fetch of object %s at byte %ld\n",
1586 hex, prev_posn);
1587 sprintf(range, "Range: bytes=%ld-", prev_posn);
1588 range_header = curl_slist_append(range_header, range);
1589 curl_easy_setopt(freq->slot->curl,
1590 CURLOPT_HTTPHEADER, range_header);
1591 }
1592
1593 return freq;
1594
1595 abort:
1596 free(freq->url);
1597 free(freq);
1598 return NULL;
1599 }
1600
1601 void process_http_object_request(struct http_object_request *freq)
1602 {
1603 if (freq->slot == NULL)
1604 return;
1605 freq->curl_result = freq->slot->curl_result;
1606 freq->http_code = freq->slot->http_code;
1607 freq->slot = NULL;
1608 }
1609
1610 int finish_http_object_request(struct http_object_request *freq)
1611 {
1612 struct stat st;
1613
1614 close(freq->localfile);
1615 freq->localfile = -1;
1616
1617 process_http_object_request(freq);
1618
1619 if (freq->http_code == 416) {
1620 warning("requested range invalid; we may already have all the data.");
1621 } else if (freq->curl_result != CURLE_OK) {
1622 if (stat(freq->tmpfile, &st) == 0)
1623 if (st.st_size == 0)
1624 unlink_or_warn(freq->tmpfile);
1625 return -1;
1626 }
1627
1628 git_inflate_end(&freq->stream);
1629 git_SHA1_Final(freq->real_sha1, &freq->c);
1630 if (freq->zret != Z_STREAM_END) {
1631 unlink_or_warn(freq->tmpfile);
1632 return -1;
1633 }
1634 if (hashcmp(freq->sha1, freq->real_sha1)) {
1635 unlink_or_warn(freq->tmpfile);
1636 return -1;
1637 }
1638 freq->rename =
1639 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1640
1641 return freq->rename;
1642 }
1643
1644 void abort_http_object_request(struct http_object_request *freq)
1645 {
1646 unlink_or_warn(freq->tmpfile);
1647
1648 release_http_object_request(freq);
1649 }
1650
1651 void release_http_object_request(struct http_object_request *freq)
1652 {
1653 if (freq->localfile != -1) {
1654 close(freq->localfile);
1655 freq->localfile = -1;
1656 }
1657 if (freq->url != NULL) {
1658 free(freq->url);
1659 freq->url = NULL;
1660 }
1661 if (freq->slot != NULL) {
1662 freq->slot->callback_func = NULL;
1663 freq->slot->callback_data = NULL;
1664 release_active_slot(freq->slot);
1665 freq->slot = NULL;
1666 }
1667 }
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