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submodules: recursive fetch also checks new tags for submodule commits
[git/jrn.git] / http.c
blob0ffd79cd81ba3e722dcdbf4c20469fa551ce9d80
1 #include "http.h"
2 #include "pack.h"
3 #include "sideband.h"
4 #include "run-command.h"
5 #include "url.h"
6 #include "credential.h"
7
8 int active_requests;
9 int http_is_verbose;
10 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
11
12 #if LIBCURL_VERSION_NUM >= 0x070a06
13 #define LIBCURL_CAN_HANDLE_AUTH_ANY
14 #endif
15
16 static int min_curl_sessions = 1;
17 static int curl_session_count;
18 #ifdef USE_CURL_MULTI
19 static int max_requests = -1;
20 static CURLM *curlm;
21 #endif
22 #ifndef NO_CURL_EASY_DUPHANDLE
23 static CURL *curl_default;
24 #endif
25
26 #define PREV_BUF_SIZE 4096
27 #define RANGE_HEADER_SIZE 30
28
29 char curl_errorstr[CURL_ERROR_SIZE];
30
31 static int curl_ssl_verify = -1;
32 static const char *ssl_cert;
33 #if LIBCURL_VERSION_NUM >= 0x070903
34 static const char *ssl_key;
35 #endif
36 #if LIBCURL_VERSION_NUM >= 0x070908
37 static const char *ssl_capath;
38 #endif
39 static const char *ssl_cainfo;
40 static long curl_low_speed_limit = -1;
41 static long curl_low_speed_time = -1;
42 static int curl_ftp_no_epsv;
43 static const char *curl_http_proxy;
44 static const char *curl_cookie_file;
45 static struct credential http_auth = CREDENTIAL_INIT;
46 static int http_proactive_auth;
47 static const char *user_agent;
48
49 #if LIBCURL_VERSION_NUM >= 0x071700
50 /* Use CURLOPT_KEYPASSWD as is */
51 #elif LIBCURL_VERSION_NUM >= 0x070903
52 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
53 #else
54 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
55 #endif
56
57 static struct credential cert_auth = CREDENTIAL_INIT;
58 static int ssl_cert_password_required;
59
60 static struct curl_slist *pragma_header;
61 static struct curl_slist *no_pragma_header;
62
63 static struct active_request_slot *active_queue_head;
64
65 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
66 {
67 size_t size = eltsize * nmemb;
68 struct buffer *buffer = buffer_;
69
70 if (size > buffer->buf.len - buffer->posn)
71 size = buffer->buf.len - buffer->posn;
72 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
73 buffer->posn += size;
74
75 return size;
76 }
77
78 #ifndef NO_CURL_IOCTL
79 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
80 {
81 struct buffer *buffer = clientp;
82
83 switch (cmd) {
84 case CURLIOCMD_NOP:
85 return CURLIOE_OK;
86
87 case CURLIOCMD_RESTARTREAD:
88 buffer->posn = 0;
89 return CURLIOE_OK;
90
91 default:
92 return CURLIOE_UNKNOWNCMD;
93 }
94 }
95 #endif
96
97 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
98 {
99 size_t size = eltsize * nmemb;
100 struct strbuf *buffer = buffer_;
101
102 strbuf_add(buffer, ptr, size);
103 return size;
104 }
105
106 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
107 {
108 return eltsize * nmemb;
109 }
110
111 #ifdef USE_CURL_MULTI
112 static void process_curl_messages(void)
113 {
114 int num_messages;
115 struct active_request_slot *slot;
116 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
117
118 while (curl_message != NULL) {
119 if (curl_message->msg == CURLMSG_DONE) {
120 int curl_result = curl_message->data.result;
121 slot = active_queue_head;
122 while (slot != NULL &&
123 slot->curl != curl_message->easy_handle)
124 slot = slot->next;
125 if (slot != NULL) {
126 curl_multi_remove_handle(curlm, slot->curl);
127 slot->curl_result = curl_result;
128 finish_active_slot(slot);
129 } else {
130 fprintf(stderr, "Received DONE message for unknown request!\n");
131 }
132 } else {
133 fprintf(stderr, "Unknown CURL message received: %d\n",
134 (int)curl_message->msg);
135 }
136 curl_message = curl_multi_info_read(curlm, &num_messages);
137 }
138 }
139 #endif
140
141 static int http_options(const char *var, const char *value, void *cb)
142 {
143 if (!strcmp("http.sslverify", var)) {
144 curl_ssl_verify = git_config_bool(var, value);
145 return 0;
146 }
147 if (!strcmp("http.sslcert", var))
148 return git_config_string(&ssl_cert, var, value);
149 #if LIBCURL_VERSION_NUM >= 0x070903
150 if (!strcmp("http.sslkey", var))
151 return git_config_string(&ssl_key, var, value);
152 #endif
153 #if LIBCURL_VERSION_NUM >= 0x070908
154 if (!strcmp("http.sslcapath", var))
155 return git_config_string(&ssl_capath, var, value);
156 #endif
157 if (!strcmp("http.sslcainfo", var))
158 return git_config_string(&ssl_cainfo, var, value);
159 if (!strcmp("http.sslcertpasswordprotected", var)) {
160 if (git_config_bool(var, value))
161 ssl_cert_password_required = 1;
162 return 0;
163 }
164 if (!strcmp("http.minsessions", var)) {
165 min_curl_sessions = git_config_int(var, value);
166 #ifndef USE_CURL_MULTI
167 if (min_curl_sessions > 1)
168 min_curl_sessions = 1;
169 #endif
170 return 0;
171 }
172 #ifdef USE_CURL_MULTI
173 if (!strcmp("http.maxrequests", var)) {
174 max_requests = git_config_int(var, value);
175 return 0;
176 }
177 #endif
178 if (!strcmp("http.lowspeedlimit", var)) {
179 curl_low_speed_limit = (long)git_config_int(var, value);
180 return 0;
181 }
182 if (!strcmp("http.lowspeedtime", var)) {
183 curl_low_speed_time = (long)git_config_int(var, value);
184 return 0;
185 }
186
187 if (!strcmp("http.noepsv", var)) {
188 curl_ftp_no_epsv = git_config_bool(var, value);
189 return 0;
190 }
191 if (!strcmp("http.proxy", var))
192 return git_config_string(&curl_http_proxy, var, value);
193
194 if (!strcmp("http.cookiefile", var))
195 return git_config_string(&curl_cookie_file, var, value);
196
197 if (!strcmp("http.postbuffer", var)) {
198 http_post_buffer = git_config_int(var, value);
199 if (http_post_buffer < LARGE_PACKET_MAX)
200 http_post_buffer = LARGE_PACKET_MAX;
201 return 0;
202 }
203
204 if (!strcmp("http.useragent", var))
205 return git_config_string(&user_agent, var, value);
206
207 /* Fall back on the default ones */
208 return git_default_config(var, value, cb);
209 }
210
211 static void init_curl_http_auth(CURL *result)
212 {
213 if (http_auth.username) {
214 struct strbuf up = STRBUF_INIT;
215 credential_fill(&http_auth);
216 strbuf_addf(&up, "%s:%s",
217 http_auth.username, http_auth.password);
218 curl_easy_setopt(result, CURLOPT_USERPWD,
219 strbuf_detach(&up, NULL));
220 }
221 }
222
223 static int has_cert_password(void)
224 {
225 if (ssl_cert == NULL || ssl_cert_password_required != 1)
226 return 0;
227 if (!cert_auth.password) {
228 cert_auth.protocol = xstrdup("cert");
229 cert_auth.path = xstrdup(ssl_cert);
230 credential_fill(&cert_auth);
231 }
232 return 1;
233 }
234
235 static CURL *get_curl_handle(void)
236 {
237 CURL *result = curl_easy_init();
238
239 if (!curl_ssl_verify) {
240 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
241 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
242 } else {
243 /* Verify authenticity of the peer's certificate */
244 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
245 /* The name in the cert must match whom we tried to connect */
246 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
247 }
248
249 #if LIBCURL_VERSION_NUM >= 0x070907
250 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
251 #endif
252 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
253 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
254 #endif
255
256 if (http_proactive_auth)
257 init_curl_http_auth(result);
258
259 if (ssl_cert != NULL)
260 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
261 if (has_cert_password())
262 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
263 #if LIBCURL_VERSION_NUM >= 0x070903
264 if (ssl_key != NULL)
265 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
266 #endif
267 #if LIBCURL_VERSION_NUM >= 0x070908
268 if (ssl_capath != NULL)
269 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
270 #endif
271 if (ssl_cainfo != NULL)
272 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
273 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
274
275 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
276 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
277 curl_low_speed_limit);
278 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
279 curl_low_speed_time);
280 }
281
282 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
283 #if LIBCURL_VERSION_NUM >= 0x071301
284 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
285 #elif LIBCURL_VERSION_NUM >= 0x071101
286 curl_easy_setopt(result, CURLOPT_POST301, 1);
287 #endif
288
289 if (getenv("GIT_CURL_VERBOSE"))
290 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
291
292 curl_easy_setopt(result, CURLOPT_USERAGENT,
293 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
294
295 if (curl_ftp_no_epsv)
296 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
297
298 if (curl_http_proxy)
299 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
300
301 return result;
302 }
303
304 static void set_from_env(const char **var, const char *envname)
305 {
306 const char *val = getenv(envname);
307 if (val)
308 *var = val;
309 }
310
311 void http_init(struct remote *remote, const char *url, int proactive_auth)
312 {
313 char *low_speed_limit;
314 char *low_speed_time;
315
316 http_is_verbose = 0;
317
318 git_config(http_options, NULL);
319
320 curl_global_init(CURL_GLOBAL_ALL);
321
322 http_proactive_auth = proactive_auth;
323
324 if (remote && remote->http_proxy)
325 curl_http_proxy = xstrdup(remote->http_proxy);
326
327 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
328 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
329
330 #ifdef USE_CURL_MULTI
331 {
332 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
333 if (http_max_requests != NULL)
334 max_requests = atoi(http_max_requests);
335 }
336
337 curlm = curl_multi_init();
338 if (curlm == NULL) {
339 fprintf(stderr, "Error creating curl multi handle.\n");
340 exit(1);
341 }
342 #endif
343
344 if (getenv("GIT_SSL_NO_VERIFY"))
345 curl_ssl_verify = 0;
346
347 set_from_env(&ssl_cert, "GIT_SSL_CERT");
348 #if LIBCURL_VERSION_NUM >= 0x070903
349 set_from_env(&ssl_key, "GIT_SSL_KEY");
350 #endif
351 #if LIBCURL_VERSION_NUM >= 0x070908
352 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
353 #endif
354 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
355
356 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
357
358 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
359 if (low_speed_limit != NULL)
360 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
361 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
362 if (low_speed_time != NULL)
363 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
364
365 if (curl_ssl_verify == -1)
366 curl_ssl_verify = 1;
367
368 curl_session_count = 0;
369 #ifdef USE_CURL_MULTI
370 if (max_requests < 1)
371 max_requests = DEFAULT_MAX_REQUESTS;
372 #endif
373
374 if (getenv("GIT_CURL_FTP_NO_EPSV"))
375 curl_ftp_no_epsv = 1;
376
377 if (url) {
378 credential_from_url(&http_auth, url);
379 if (!ssl_cert_password_required &&
380 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
381 !prefixcmp(url, "https://"))
382 ssl_cert_password_required = 1;
383 }
384
385 #ifndef NO_CURL_EASY_DUPHANDLE
386 curl_default = get_curl_handle();
387 #endif
388 }
389
390 void http_cleanup(void)
391 {
392 struct active_request_slot *slot = active_queue_head;
393
394 while (slot != NULL) {
395 struct active_request_slot *next = slot->next;
396 if (slot->curl != NULL) {
397 #ifdef USE_CURL_MULTI
398 curl_multi_remove_handle(curlm, slot->curl);
399 #endif
400 curl_easy_cleanup(slot->curl);
401 }
402 free(slot);
403 slot = next;
404 }
405 active_queue_head = NULL;
406
407 #ifndef NO_CURL_EASY_DUPHANDLE
408 curl_easy_cleanup(curl_default);
409 #endif
410
411 #ifdef USE_CURL_MULTI
412 curl_multi_cleanup(curlm);
413 #endif
414 curl_global_cleanup();
415
416 curl_slist_free_all(pragma_header);
417 pragma_header = NULL;
418
419 curl_slist_free_all(no_pragma_header);
420 no_pragma_header = NULL;
421
422 if (curl_http_proxy) {
423 free((void *)curl_http_proxy);
424 curl_http_proxy = NULL;
425 }
426
427 if (cert_auth.password != NULL) {
428 memset(cert_auth.password, 0, strlen(cert_auth.password));
429 free(cert_auth.password);
430 cert_auth.password = NULL;
431 }
432 ssl_cert_password_required = 0;
433 }
434
435 struct active_request_slot *get_active_slot(void)
436 {
437 struct active_request_slot *slot = active_queue_head;
438 struct active_request_slot *newslot;
439
440 #ifdef USE_CURL_MULTI
441 int num_transfers;
442
443 /* Wait for a slot to open up if the queue is full */
444 while (active_requests >= max_requests) {
445 curl_multi_perform(curlm, &num_transfers);
446 if (num_transfers < active_requests)
447 process_curl_messages();
448 }
449 #endif
450
451 while (slot != NULL && slot->in_use)
452 slot = slot->next;
453
454 if (slot == NULL) {
455 newslot = xmalloc(sizeof(*newslot));
456 newslot->curl = NULL;
457 newslot->in_use = 0;
458 newslot->next = NULL;
459
460 slot = active_queue_head;
461 if (slot == NULL) {
462 active_queue_head = newslot;
463 } else {
464 while (slot->next != NULL)
465 slot = slot->next;
466 slot->next = newslot;
467 }
468 slot = newslot;
469 }
470
471 if (slot->curl == NULL) {
472 #ifdef NO_CURL_EASY_DUPHANDLE
473 slot->curl = get_curl_handle();
474 #else
475 slot->curl = curl_easy_duphandle(curl_default);
476 #endif
477 curl_session_count++;
478 }
479
480 active_requests++;
481 slot->in_use = 1;
482 slot->results = NULL;
483 slot->finished = NULL;
484 slot->callback_data = NULL;
485 slot->callback_func = NULL;
486 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
487 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
488 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
489 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
490 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
491 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
492 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
493 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
494 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
495
496 return slot;
497 }
498
499 int start_active_slot(struct active_request_slot *slot)
500 {
501 #ifdef USE_CURL_MULTI
502 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
503 int num_transfers;
504
505 if (curlm_result != CURLM_OK &&
506 curlm_result != CURLM_CALL_MULTI_PERFORM) {
507 active_requests--;
508 slot->in_use = 0;
509 return 0;
510 }
511
512 /*
513 * We know there must be something to do, since we just added
514 * something.
515 */
516 curl_multi_perform(curlm, &num_transfers);
517 #endif
518 return 1;
519 }
520
521 #ifdef USE_CURL_MULTI
522 struct fill_chain {
523 void *data;
524 int (*fill)(void *);
525 struct fill_chain *next;
526 };
527
528 static struct fill_chain *fill_cfg;
529
530 void add_fill_function(void *data, int (*fill)(void *))
531 {
532 struct fill_chain *new = xmalloc(sizeof(*new));
533 struct fill_chain **linkp = &fill_cfg;
534 new->data = data;
535 new->fill = fill;
536 new->next = NULL;
537 while (*linkp)
538 linkp = &(*linkp)->next;
539 *linkp = new;
540 }
541
542 void fill_active_slots(void)
543 {
544 struct active_request_slot *slot = active_queue_head;
545
546 while (active_requests < max_requests) {
547 struct fill_chain *fill;
548 for (fill = fill_cfg; fill; fill = fill->next)
549 if (fill->fill(fill->data))
550 break;
551
552 if (!fill)
553 break;
554 }
555
556 while (slot != NULL) {
557 if (!slot->in_use && slot->curl != NULL
558 && curl_session_count > min_curl_sessions) {
559 curl_easy_cleanup(slot->curl);
560 slot->curl = NULL;
561 curl_session_count--;
562 }
563 slot = slot->next;
564 }
565 }
566
567 void step_active_slots(void)
568 {
569 int num_transfers;
570 CURLMcode curlm_result;
571
572 do {
573 curlm_result = curl_multi_perform(curlm, &num_transfers);
574 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
575 if (num_transfers < active_requests) {
576 process_curl_messages();
577 fill_active_slots();
578 }
579 }
580 #endif
581
582 void run_active_slot(struct active_request_slot *slot)
583 {
584 #ifdef USE_CURL_MULTI
585 fd_set readfds;
586 fd_set writefds;
587 fd_set excfds;
588 int max_fd;
589 struct timeval select_timeout;
590 int finished = 0;
591
592 slot->finished = &finished;
593 while (!finished) {
594 step_active_slots();
595
596 if (slot->in_use) {
597 #if LIBCURL_VERSION_NUM >= 0x070f04
598 long curl_timeout;
599 curl_multi_timeout(curlm, &curl_timeout);
600 if (curl_timeout == 0) {
601 continue;
602 } else if (curl_timeout == -1) {
603 select_timeout.tv_sec = 0;
604 select_timeout.tv_usec = 50000;
605 } else {
606 select_timeout.tv_sec = curl_timeout / 1000;
607 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
608 }
609 #else
610 select_timeout.tv_sec = 0;
611 select_timeout.tv_usec = 50000;
612 #endif
613
614 max_fd = -1;
615 FD_ZERO(&readfds);
616 FD_ZERO(&writefds);
617 FD_ZERO(&excfds);
618 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
619
620 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
621 }
622 }
623 #else
624 while (slot->in_use) {
625 slot->curl_result = curl_easy_perform(slot->curl);
626 finish_active_slot(slot);
627 }
628 #endif
629 }
630
631 static void closedown_active_slot(struct active_request_slot *slot)
632 {
633 active_requests--;
634 slot->in_use = 0;
635 }
636
637 static void release_active_slot(struct active_request_slot *slot)
638 {
639 closedown_active_slot(slot);
640 if (slot->curl && curl_session_count > min_curl_sessions) {
641 #ifdef USE_CURL_MULTI
642 curl_multi_remove_handle(curlm, slot->curl);
643 #endif
644 curl_easy_cleanup(slot->curl);
645 slot->curl = NULL;
646 curl_session_count--;
647 }
648 #ifdef USE_CURL_MULTI
649 fill_active_slots();
650 #endif
651 }
652
653 void finish_active_slot(struct active_request_slot *slot)
654 {
655 closedown_active_slot(slot);
656 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
657
658 if (slot->finished != NULL)
659 (*slot->finished) = 1;
660
661 /* Store slot results so they can be read after the slot is reused */
662 if (slot->results != NULL) {
663 slot->results->curl_result = slot->curl_result;
664 slot->results->http_code = slot->http_code;
665 }
666
667 /* Run callback if appropriate */
668 if (slot->callback_func != NULL)
669 slot->callback_func(slot->callback_data);
670 }
671
672 void finish_all_active_slots(void)
673 {
674 struct active_request_slot *slot = active_queue_head;
675
676 while (slot != NULL)
677 if (slot->in_use) {
678 run_active_slot(slot);
679 slot = active_queue_head;
680 } else {
681 slot = slot->next;
682 }
683 }
684
685 /* Helpers for modifying and creating URLs */
686 static inline int needs_quote(int ch)
687 {
688 if (((ch >= 'A') && (ch <= 'Z'))
689 || ((ch >= 'a') && (ch <= 'z'))
690 || ((ch >= '0') && (ch <= '9'))
691 || (ch == '/')
692 || (ch == '-')
693 || (ch == '.'))
694 return 0;
695 return 1;
696 }
697
698 static char *quote_ref_url(const char *base, const char *ref)
699 {
700 struct strbuf buf = STRBUF_INIT;
701 const char *cp;
702 int ch;
703
704 end_url_with_slash(&buf, base);
705
706 for (cp = ref; (ch = *cp) != 0; cp++)
707 if (needs_quote(ch))
708 strbuf_addf(&buf, "%%%02x", ch);
709 else
710 strbuf_addch(&buf, *cp);
711
712 return strbuf_detach(&buf, NULL);
713 }
714
715 void append_remote_object_url(struct strbuf *buf, const char *url,
716 const char *hex,
717 int only_two_digit_prefix)
718 {
719 end_url_with_slash(buf, url);
720
721 strbuf_addf(buf, "objects/%.*s/", 2, hex);
722 if (!only_two_digit_prefix)
723 strbuf_addf(buf, "%s", hex+2);
724 }
725
726 char *get_remote_object_url(const char *url, const char *hex,
727 int only_two_digit_prefix)
728 {
729 struct strbuf buf = STRBUF_INIT;
730 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
731 return strbuf_detach(&buf, NULL);
732 }
733
734 /* http_request() targets */
735 #define HTTP_REQUEST_STRBUF 0
736 #define HTTP_REQUEST_FILE 1
737
738 static int http_request(const char *url, void *result, int target, int options)
739 {
740 struct active_request_slot *slot;
741 struct slot_results results;
742 struct curl_slist *headers = NULL;
743 struct strbuf buf = STRBUF_INIT;
744 int ret;
745
746 slot = get_active_slot();
747 slot->results = &results;
748 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
749
750 if (result == NULL) {
751 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
752 } else {
753 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
754 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
755
756 if (target == HTTP_REQUEST_FILE) {
757 long posn = ftell(result);
758 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
759 fwrite);
760 if (posn > 0) {
761 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
762 headers = curl_slist_append(headers, buf.buf);
763 strbuf_reset(&buf);
764 }
765 } else
766 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
767 fwrite_buffer);
768 }
769
770 strbuf_addstr(&buf, "Pragma:");
771 if (options & HTTP_NO_CACHE)
772 strbuf_addstr(&buf, " no-cache");
773
774 headers = curl_slist_append(headers, buf.buf);
775
776 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
777 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
778
779 if (start_active_slot(slot)) {
780 run_active_slot(slot);
781 if (results.curl_result == CURLE_OK)
782 ret = HTTP_OK;
783 else if (missing_target(&results))
784 ret = HTTP_MISSING_TARGET;
785 else if (results.http_code == 401) {
786 if (http_auth.username && http_auth.password) {
787 credential_reject(&http_auth);
788 ret = HTTP_NOAUTH;
789 } else {
790 credential_fill(&http_auth);
791 init_curl_http_auth(slot->curl);
792 ret = HTTP_REAUTH;
793 }
794 } else {
795 if (!curl_errorstr[0])
796 strlcpy(curl_errorstr,
797 curl_easy_strerror(results.curl_result),
798 sizeof(curl_errorstr));
799 ret = HTTP_ERROR;
800 }
801 } else {
802 error("Unable to start HTTP request for %s", url);
803 ret = HTTP_START_FAILED;
804 }
805
806 curl_slist_free_all(headers);
807 strbuf_release(&buf);
808
809 if (ret == HTTP_OK)
810 credential_approve(&http_auth);
811
812 return ret;
813 }
814
815 static int http_request_reauth(const char *url, void *result, int target,
816 int options)
817 {
818 int ret = http_request(url, result, target, options);
819 if (ret != HTTP_REAUTH)
820 return ret;
821 return http_request(url, result, target, options);
822 }
823
824 int http_get_strbuf(const char *url, struct strbuf *result, int options)
825 {
826 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
827 }
828
829 /*
830 * Downloads an url and stores the result in the given file.
831 *
832 * If a previous interrupted download is detected (i.e. a previous temporary
833 * file is still around) the download is resumed.
834 */
835 static int http_get_file(const char *url, const char *filename, int options)
836 {
837 int ret;
838 struct strbuf tmpfile = STRBUF_INIT;
839 FILE *result;
840
841 strbuf_addf(&tmpfile, "%s.temp", filename);
842 result = fopen(tmpfile.buf, "a");
843 if (! result) {
844 error("Unable to open local file %s", tmpfile.buf);
845 ret = HTTP_ERROR;
846 goto cleanup;
847 }
848
849 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
850 fclose(result);
851
852 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
853 ret = HTTP_ERROR;
854 cleanup:
855 strbuf_release(&tmpfile);
856 return ret;
857 }
858
859 int http_error(const char *url, int ret)
860 {
861 /* http_request has already handled HTTP_START_FAILED. */
862 if (ret != HTTP_START_FAILED)
863 error("%s while accessing %s", curl_errorstr, url);
864
865 return ret;
866 }
867
868 int http_fetch_ref(const char *base, struct ref *ref)
869 {
870 char *url;
871 struct strbuf buffer = STRBUF_INIT;
872 int ret = -1;
873
874 url = quote_ref_url(base, ref->name);
875 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
876 strbuf_rtrim(&buffer);
877 if (buffer.len == 40)
878 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
879 else if (!prefixcmp(buffer.buf, "ref: ")) {
880 ref->symref = xstrdup(buffer.buf + 5);
881 ret = 0;
882 }
883 }
884
885 strbuf_release(&buffer);
886 free(url);
887 return ret;
888 }
889
890 /* Helpers for fetching packs */
891 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
892 {
893 char *url, *tmp;
894 struct strbuf buf = STRBUF_INIT;
895
896 if (http_is_verbose)
897 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
898
899 end_url_with_slash(&buf, base_url);
900 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
901 url = strbuf_detach(&buf, NULL);
902
903 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
904 tmp = strbuf_detach(&buf, NULL);
905
906 if (http_get_file(url, tmp, 0) != HTTP_OK) {
907 error("Unable to get pack index %s\n", url);
908 free(tmp);
909 tmp = NULL;
910 }
911
912 free(url);
913 return tmp;
914 }
915
916 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
917 unsigned char *sha1, const char *base_url)
918 {
919 struct packed_git *new_pack;
920 char *tmp_idx = NULL;
921 int ret;
922
923 if (has_pack_index(sha1)) {
924 new_pack = parse_pack_index(sha1, NULL);
925 if (!new_pack)
926 return -1; /* parse_pack_index() already issued error message */
927 goto add_pack;
928 }
929
930 tmp_idx = fetch_pack_index(sha1, base_url);
931 if (!tmp_idx)
932 return -1;
933
934 new_pack = parse_pack_index(sha1, tmp_idx);
935 if (!new_pack) {
936 unlink(tmp_idx);
937 free(tmp_idx);
938
939 return -1; /* parse_pack_index() already issued error message */
940 }
941
942 ret = verify_pack_index(new_pack);
943 if (!ret) {
944 close_pack_index(new_pack);
945 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
946 }
947 free(tmp_idx);
948 if (ret)
949 return -1;
950
951 add_pack:
952 new_pack->next = *packs_head;
953 *packs_head = new_pack;
954 return 0;
955 }
956
957 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
958 {
959 int ret = 0, i = 0;
960 char *url, *data;
961 struct strbuf buf = STRBUF_INIT;
962 unsigned char sha1[20];
963
964 end_url_with_slash(&buf, base_url);
965 strbuf_addstr(&buf, "objects/info/packs");
966 url = strbuf_detach(&buf, NULL);
967
968 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
969 if (ret != HTTP_OK)
970 goto cleanup;
971
972 data = buf.buf;
973 while (i < buf.len) {
974 switch (data[i]) {
975 case 'P':
976 i++;
977 if (i + 52 <= buf.len &&
978 !prefixcmp(data + i, " pack-") &&
979 !prefixcmp(data + i + 46, ".pack\n")) {
980 get_sha1_hex(data + i + 6, sha1);
981 fetch_and_setup_pack_index(packs_head, sha1,
982 base_url);
983 i += 51;
984 break;
985 }
986 default:
987 while (i < buf.len && data[i] != '\n')
988 i++;
989 }
990 i++;
991 }
992
993 cleanup:
994 free(url);
995 return ret;
996 }
997
998 void release_http_pack_request(struct http_pack_request *preq)
999 {
1000 if (preq->packfile != NULL) {
1001 fclose(preq->packfile);
1002 preq->packfile = NULL;
1003 }
1004 if (preq->range_header != NULL) {
1005 curl_slist_free_all(preq->range_header);
1006 preq->range_header = NULL;
1007 }
1008 preq->slot = NULL;
1009 free(preq->url);
1010 }
1011
1012 int finish_http_pack_request(struct http_pack_request *preq)
1013 {
1014 struct packed_git **lst;
1015 struct packed_git *p = preq->target;
1016 char *tmp_idx;
1017 struct child_process ip;
1018 const char *ip_argv[8];
1019
1020 close_pack_index(p);
1021
1022 fclose(preq->packfile);
1023 preq->packfile = NULL;
1024
1025 lst = preq->lst;
1026 while (*lst != p)
1027 lst = &((*lst)->next);
1028 *lst = (*lst)->next;
1029
1030 tmp_idx = xstrdup(preq->tmpfile);
1031 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1032 ".idx.temp");
1033
1034 ip_argv[0] = "index-pack";
1035 ip_argv[1] = "-o";
1036 ip_argv[2] = tmp_idx;
1037 ip_argv[3] = preq->tmpfile;
1038 ip_argv[4] = NULL;
1039
1040 memset(&ip, 0, sizeof(ip));
1041 ip.argv = ip_argv;
1042 ip.git_cmd = 1;
1043 ip.no_stdin = 1;
1044 ip.no_stdout = 1;
1045
1046 if (run_command(&ip)) {
1047 unlink(preq->tmpfile);
1048 unlink(tmp_idx);
1049 free(tmp_idx);
1050 return -1;
1051 }
1052
1053 unlink(sha1_pack_index_name(p->sha1));
1054
1055 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1056 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1057 free(tmp_idx);
1058 return -1;
1059 }
1060
1061 install_packed_git(p);
1062 free(tmp_idx);
1063 return 0;
1064 }
1065
1066 struct http_pack_request *new_http_pack_request(
1067 struct packed_git *target, const char *base_url)
1068 {
1069 long prev_posn = 0;
1070 char range[RANGE_HEADER_SIZE];
1071 struct strbuf buf = STRBUF_INIT;
1072 struct http_pack_request *preq;
1073
1074 preq = xcalloc(1, sizeof(*preq));
1075 preq->target = target;
1076
1077 end_url_with_slash(&buf, base_url);
1078 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1079 sha1_to_hex(target->sha1));
1080 preq->url = strbuf_detach(&buf, NULL);
1081
1082 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1083 sha1_pack_name(target->sha1));
1084 preq->packfile = fopen(preq->tmpfile, "a");
1085 if (!preq->packfile) {
1086 error("Unable to open local file %s for pack",
1087 preq->tmpfile);
1088 goto abort;
1089 }
1090
1091 preq->slot = get_active_slot();
1092 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1093 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1094 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1095 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1096 no_pragma_header);
1097
1098 /*
1099 * If there is data present from a previous transfer attempt,
1100 * resume where it left off
1101 */
1102 prev_posn = ftell(preq->packfile);
1103 if (prev_posn>0) {
1104 if (http_is_verbose)
1105 fprintf(stderr,
1106 "Resuming fetch of pack %s at byte %ld\n",
1107 sha1_to_hex(target->sha1), prev_posn);
1108 sprintf(range, "Range: bytes=%ld-", prev_posn);
1109 preq->range_header = curl_slist_append(NULL, range);
1110 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1111 preq->range_header);
1112 }
1113
1114 return preq;
1115
1116 abort:
1117 free(preq->url);
1118 free(preq);
1119 return NULL;
1120 }
1121
1122 /* Helpers for fetching objects (loose) */
1123 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1124 void *data)
1125 {
1126 unsigned char expn[4096];
1127 size_t size = eltsize * nmemb;
1128 int posn = 0;
1129 struct http_object_request *freq =
1130 (struct http_object_request *)data;
1131 do {
1132 ssize_t retval = xwrite(freq->localfile,
1133 (char *) ptr + posn, size - posn);
1134 if (retval < 0)
1135 return posn;
1136 posn += retval;
1137 } while (posn < size);
1138
1139 freq->stream.avail_in = size;
1140 freq->stream.next_in = (void *)ptr;
1141 do {
1142 freq->stream.next_out = expn;
1143 freq->stream.avail_out = sizeof(expn);
1144 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1145 git_SHA1_Update(&freq->c, expn,
1146 sizeof(expn) - freq->stream.avail_out);
1147 } while (freq->stream.avail_in && freq->zret == Z_OK);
1148 return size;
1149 }
1150
1151 struct http_object_request *new_http_object_request(const char *base_url,
1152 unsigned char *sha1)
1153 {
1154 char *hex = sha1_to_hex(sha1);
1155 char *filename;
1156 char prevfile[PATH_MAX];
1157 int prevlocal;
1158 char prev_buf[PREV_BUF_SIZE];
1159 ssize_t prev_read = 0;
1160 long prev_posn = 0;
1161 char range[RANGE_HEADER_SIZE];
1162 struct curl_slist *range_header = NULL;
1163 struct http_object_request *freq;
1164
1165 freq = xcalloc(1, sizeof(*freq));
1166 hashcpy(freq->sha1, sha1);
1167 freq->localfile = -1;
1168
1169 filename = sha1_file_name(sha1);
1170 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1171 "%s.temp", filename);
1172
1173 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1174 unlink_or_warn(prevfile);
1175 rename(freq->tmpfile, prevfile);
1176 unlink_or_warn(freq->tmpfile);
1177
1178 if (freq->localfile != -1)
1179 error("fd leakage in start: %d", freq->localfile);
1180 freq->localfile = open(freq->tmpfile,
1181 O_WRONLY | O_CREAT | O_EXCL, 0666);
1182 /*
1183 * This could have failed due to the "lazy directory creation";
1184 * try to mkdir the last path component.
1185 */
1186 if (freq->localfile < 0 && errno == ENOENT) {
1187 char *dir = strrchr(freq->tmpfile, '/');
1188 if (dir) {
1189 *dir = 0;
1190 mkdir(freq->tmpfile, 0777);
1191 *dir = '/';
1192 }
1193 freq->localfile = open(freq->tmpfile,
1194 O_WRONLY | O_CREAT | O_EXCL, 0666);
1195 }
1196
1197 if (freq->localfile < 0) {
1198 error("Couldn't create temporary file %s: %s",
1199 freq->tmpfile, strerror(errno));
1200 goto abort;
1201 }
1202
1203 git_inflate_init(&freq->stream);
1204
1205 git_SHA1_Init(&freq->c);
1206
1207 freq->url = get_remote_object_url(base_url, hex, 0);
1208
1209 /*
1210 * If a previous temp file is present, process what was already
1211 * fetched.
1212 */
1213 prevlocal = open(prevfile, O_RDONLY);
1214 if (prevlocal != -1) {
1215 do {
1216 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1217 if (prev_read>0) {
1218 if (fwrite_sha1_file(prev_buf,
1219 1,
1220 prev_read,
1221 freq) == prev_read) {
1222 prev_posn += prev_read;
1223 } else {
1224 prev_read = -1;
1225 }
1226 }
1227 } while (prev_read > 0);
1228 close(prevlocal);
1229 }
1230 unlink_or_warn(prevfile);
1231
1232 /*
1233 * Reset inflate/SHA1 if there was an error reading the previous temp
1234 * file; also rewind to the beginning of the local file.
1235 */
1236 if (prev_read == -1) {
1237 memset(&freq->stream, 0, sizeof(freq->stream));
1238 git_inflate_init(&freq->stream);
1239 git_SHA1_Init(&freq->c);
1240 if (prev_posn>0) {
1241 prev_posn = 0;
1242 lseek(freq->localfile, 0, SEEK_SET);
1243 if (ftruncate(freq->localfile, 0) < 0) {
1244 error("Couldn't truncate temporary file %s: %s",
1245 freq->tmpfile, strerror(errno));
1246 goto abort;
1247 }
1248 }
1249 }
1250
1251 freq->slot = get_active_slot();
1252
1253 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1254 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1255 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1256 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1257 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1258
1259 /*
1260 * If we have successfully processed data from a previous fetch
1261 * attempt, only fetch the data we don't already have.
1262 */
1263 if (prev_posn>0) {
1264 if (http_is_verbose)
1265 fprintf(stderr,
1266 "Resuming fetch of object %s at byte %ld\n",
1267 hex, prev_posn);
1268 sprintf(range, "Range: bytes=%ld-", prev_posn);
1269 range_header = curl_slist_append(range_header, range);
1270 curl_easy_setopt(freq->slot->curl,
1271 CURLOPT_HTTPHEADER, range_header);
1272 }
1273
1274 return freq;
1275
1276 abort:
1277 free(freq->url);
1278 free(freq);
1279 return NULL;
1280 }
1281
1282 void process_http_object_request(struct http_object_request *freq)
1283 {
1284 if (freq->slot == NULL)
1285 return;
1286 freq->curl_result = freq->slot->curl_result;
1287 freq->http_code = freq->slot->http_code;
1288 freq->slot = NULL;
1289 }
1290
1291 int finish_http_object_request(struct http_object_request *freq)
1292 {
1293 struct stat st;
1294
1295 close(freq->localfile);
1296 freq->localfile = -1;
1297
1298 process_http_object_request(freq);
1299
1300 if (freq->http_code == 416) {
1301 warning("requested range invalid; we may already have all the data.");
1302 } else if (freq->curl_result != CURLE_OK) {
1303 if (stat(freq->tmpfile, &st) == 0)
1304 if (st.st_size == 0)
1305 unlink_or_warn(freq->tmpfile);
1306 return -1;
1307 }
1308
1309 git_inflate_end(&freq->stream);
1310 git_SHA1_Final(freq->real_sha1, &freq->c);
1311 if (freq->zret != Z_STREAM_END) {
1312 unlink_or_warn(freq->tmpfile);
1313 return -1;
1314 }
1315 if (hashcmp(freq->sha1, freq->real_sha1)) {
1316 unlink_or_warn(freq->tmpfile);
1317 return -1;
1318 }
1319 freq->rename =
1320 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1321
1322 return freq->rename;
1323 }
1324
1325 void abort_http_object_request(struct http_object_request *freq)
1326 {
1327 unlink_or_warn(freq->tmpfile);
1328
1329 release_http_object_request(freq);
1330 }
1331
1332 void release_http_object_request(struct http_object_request *freq)
1333 {
1334 if (freq->localfile != -1) {
1335 close(freq->localfile);
1336 freq->localfile = -1;
1337 }
1338 if (freq->url != NULL) {
1339 free(freq->url);
1340 freq->url = NULL;
1341 }
1342 if (freq->slot != NULL) {
1343 freq->slot->callback_func = NULL;
1344 freq->slot->callback_data = NULL;
1345 release_active_slot(freq->slot);
1346 freq->slot = NULL;
1347 }
1348 }
Jonathan Nieder’s miscellaneous git branches