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mingw: do not hide bare repositories
[git/dscho.git] / http.c
blob75a3c49cec5ae52beeac5b6ce72be5c9e56f5b70
1 #include "http.h"
2 #include "pack.h"
3 #include "sideband.h"
4 #include "run-command.h"
5 #include "url.h"
6 #include "exec_cmd.h"
7
8 int data_received;
9 int active_requests;
10 int http_is_verbose;
11 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
12
13 #if LIBCURL_VERSION_NUM >= 0x070a06
14 #define LIBCURL_CAN_HANDLE_AUTH_ANY
15 #endif
16
17 static int min_curl_sessions = 1;
18 static int curl_session_count;
19 #ifdef USE_CURL_MULTI
20 static int max_requests = -1;
21 static CURLM *curlm;
22 #endif
23 #ifndef NO_CURL_EASY_DUPHANDLE
24 static CURL *curl_default;
25 #endif
26
27 #define PREV_BUF_SIZE 4096
28 #define RANGE_HEADER_SIZE 30
29
30 char curl_errorstr[CURL_ERROR_SIZE];
31
32 static int curl_ssl_verify = -1;
33 static const char *ssl_cert;
34 #if LIBCURL_VERSION_NUM >= 0x070903
35 static const char *ssl_key;
36 #endif
37 #if LIBCURL_VERSION_NUM >= 0x070908
38 static const char *ssl_capath;
39 #endif
40 static const char *ssl_cainfo;
41 static long curl_low_speed_limit = -1;
42 static long curl_low_speed_time = -1;
43 static int curl_ftp_no_epsv;
44 static const char *curl_http_proxy;
45 static const char *curl_cookie_file;
46 static char *user_name, *user_pass;
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 char *ssl_cert_password;
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 data_received++;
104 return size;
105 }
106
107 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
108 {
109 data_received++;
110 return eltsize * nmemb;
111 }
112
113 #ifdef USE_CURL_MULTI
114 static void process_curl_messages(void)
115 {
116 int num_messages;
117 struct active_request_slot *slot;
118 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
119
120 while (curl_message != NULL) {
121 if (curl_message->msg == CURLMSG_DONE) {
122 int curl_result = curl_message->data.result;
123 slot = active_queue_head;
124 while (slot != NULL &&
125 slot->curl != curl_message->easy_handle)
126 slot = slot->next;
127 if (slot != NULL) {
128 curl_multi_remove_handle(curlm, slot->curl);
129 slot->curl_result = curl_result;
130 finish_active_slot(slot);
131 } else {
132 fprintf(stderr, "Received DONE message for unknown request!\n");
133 }
134 } else {
135 fprintf(stderr, "Unknown CURL message received: %d\n",
136 (int)curl_message->msg);
137 }
138 curl_message = curl_multi_info_read(curlm, &num_messages);
139 }
140 }
141 #endif
142
143 static int git_config_path(const char **result,
144 const char *var, const char *value)
145 {
146 if (git_config_string(result, var, value))
147 return 1;
148 #ifdef __MINGW32__
149 if (**result == '/')
150 *result = system_path((*result) + 1);
151 #endif
152 return 0;
153 }
154
155 static int http_options(const char *var, const char *value, void *cb)
156 {
157 if (!strcmp("http.sslverify", var)) {
158 curl_ssl_verify = git_config_bool(var, value);
159 return 0;
160 }
161 if (!strcmp("http.sslcert", var))
162 return git_config_path(&ssl_cert, var, value);
163 #if LIBCURL_VERSION_NUM >= 0x070903
164 if (!strcmp("http.sslkey", var))
165 return git_config_path(&ssl_key, var, value);
166 #endif
167 #if LIBCURL_VERSION_NUM >= 0x070908
168 if (!strcmp("http.sslcapath", var))
169 return git_config_path(&ssl_capath, var, value);
170 #endif
171 if (!strcmp("http.sslcainfo", var))
172 return git_config_path(&ssl_cainfo, var, value);
173 if (!strcmp("http.sslcertpasswordprotected", var)) {
174 if (git_config_bool(var, value))
175 ssl_cert_password_required = 1;
176 return 0;
177 }
178 if (!strcmp("http.minsessions", var)) {
179 min_curl_sessions = git_config_int(var, value);
180 #ifndef USE_CURL_MULTI
181 if (min_curl_sessions > 1)
182 min_curl_sessions = 1;
183 #endif
184 return 0;
185 }
186 #ifdef USE_CURL_MULTI
187 if (!strcmp("http.maxrequests", var)) {
188 max_requests = git_config_int(var, value);
189 return 0;
190 }
191 #endif
192 if (!strcmp("http.lowspeedlimit", var)) {
193 curl_low_speed_limit = (long)git_config_int(var, value);
194 return 0;
195 }
196 if (!strcmp("http.lowspeedtime", var)) {
197 curl_low_speed_time = (long)git_config_int(var, value);
198 return 0;
199 }
200
201 if (!strcmp("http.noepsv", var)) {
202 curl_ftp_no_epsv = git_config_bool(var, value);
203 return 0;
204 }
205 if (!strcmp("http.proxy", var))
206 return git_config_string(&curl_http_proxy, var, value);
207
208 if (!strcmp("http.cookiefile", var))
209 return git_config_string(&curl_cookie_file, var, value);
210
211 if (!strcmp("http.postbuffer", var)) {
212 http_post_buffer = git_config_int(var, value);
213 if (http_post_buffer < LARGE_PACKET_MAX)
214 http_post_buffer = LARGE_PACKET_MAX;
215 return 0;
216 }
217
218 if (!strcmp("http.useragent", var))
219 return git_config_string(&user_agent, var, value);
220
221 /* Fall back on the default ones */
222 return git_default_config(var, value, cb);
223 }
224
225 static void init_curl_http_auth(CURL *result)
226 {
227 if (user_name) {
228 struct strbuf up = STRBUF_INIT;
229 if (!user_pass)
230 user_pass = xstrdup(git_getpass("Password: "));
231 strbuf_addf(&up, "%s:%s", user_name, user_pass);
232 curl_easy_setopt(result, CURLOPT_USERPWD,
233 strbuf_detach(&up, NULL));
234 }
235 }
236
237 static int has_cert_password(void)
238 {
239 if (ssl_cert_password != NULL)
240 return 1;
241 if (ssl_cert == NULL || ssl_cert_password_required != 1)
242 return 0;
243 /* Only prompt the user once. */
244 ssl_cert_password_required = -1;
245 ssl_cert_password = git_getpass("Certificate Password: ");
246 if (ssl_cert_password != NULL) {
247 ssl_cert_password = xstrdup(ssl_cert_password);
248 return 1;
249 } else
250 return 0;
251 }
252
253 static CURL *get_curl_handle(void)
254 {
255 CURL *result = curl_easy_init();
256
257 if (!curl_ssl_verify) {
258 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
259 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
260 } else {
261 /* Verify authenticity of the peer's certificate */
262 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
263 /* The name in the cert must match whom we tried to connect */
264 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
265 }
266
267 #if LIBCURL_VERSION_NUM >= 0x070907
268 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
269 #endif
270 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
271 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
272 #endif
273
274 init_curl_http_auth(result);
275
276 if (ssl_cert != NULL)
277 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
278 if (has_cert_password())
279 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
280 #if LIBCURL_VERSION_NUM >= 0x070903
281 if (ssl_key != NULL)
282 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
283 #endif
284 #if LIBCURL_VERSION_NUM >= 0x070908
285 if (ssl_capath != NULL)
286 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
287 #endif
288 if (ssl_cainfo != NULL)
289 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
290 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
291
292 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
293 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
294 curl_low_speed_limit);
295 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
296 curl_low_speed_time);
297 }
298
299 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
300 #if LIBCURL_VERSION_NUM >= 0x071301
301 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
302 #elif LIBCURL_VERSION_NUM >= 0x071101
303 curl_easy_setopt(result, CURLOPT_POST301, 1);
304 #endif
305
306 if (getenv("GIT_CURL_VERBOSE"))
307 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
308
309 curl_easy_setopt(result, CURLOPT_USERAGENT,
310 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
311
312 if (curl_ftp_no_epsv)
313 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
314
315 if (curl_http_proxy)
316 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
317
318 return result;
319 }
320
321 static void http_auth_init(const char *url)
322 {
323 char *at, *colon, *cp, *slash, *decoded;
324 int len;
325
326 cp = strstr(url, "://");
327 if (!cp)
328 return;
329
330 /*
331 * Ok, the URL looks like "proto://something". Which one?
332 * "proto://<user>:<pass>@<host>/...",
333 * "proto://<user>@<host>/...", or just
334 * "proto://<host>/..."?
335 */
336 cp += 3;
337 at = strchr(cp, '@');
338 colon = strchr(cp, ':');
339 slash = strchrnul(cp, '/');
340 if (!at || slash <= at)
341 return; /* No credentials */
342 if (!colon || at <= colon) {
343 /* Only username */
344 len = at - cp;
345 user_name = xmalloc(len + 1);
346 memcpy(user_name, cp, len);
347 user_name[len] = '\0';
348 decoded = url_decode(user_name);
349 free(user_name);
350 user_name = decoded;
351 user_pass = NULL;
352 } else {
353 len = colon - cp;
354 user_name = xmalloc(len + 1);
355 memcpy(user_name, cp, len);
356 user_name[len] = '\0';
357 decoded = url_decode(user_name);
358 free(user_name);
359 user_name = decoded;
360 len = at - (colon + 1);
361 user_pass = xmalloc(len + 1);
362 memcpy(user_pass, colon + 1, len);
363 user_pass[len] = '\0';
364 decoded = url_decode(user_pass);
365 free(user_pass);
366 user_pass = decoded;
367 }
368 }
369
370 static void set_from_env(const char **var, const char *envname)
371 {
372 const char *val = getenv(envname);
373 if (val)
374 *var = val;
375 }
376
377 void http_init(struct remote *remote)
378 {
379 char *low_speed_limit;
380 char *low_speed_time;
381
382 http_is_verbose = 0;
383
384 git_config(http_options, NULL);
385
386 curl_global_init(CURL_GLOBAL_ALL);
387
388 if (remote && remote->http_proxy)
389 curl_http_proxy = xstrdup(remote->http_proxy);
390
391 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
392 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
393
394 #ifdef USE_CURL_MULTI
395 {
396 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
397 if (http_max_requests != NULL)
398 max_requests = atoi(http_max_requests);
399 }
400
401 curlm = curl_multi_init();
402 if (curlm == NULL) {
403 fprintf(stderr, "Error creating curl multi handle.\n");
404 exit(1);
405 }
406 #endif
407
408 if (getenv("GIT_SSL_NO_VERIFY"))
409 curl_ssl_verify = 0;
410
411 set_from_env(&ssl_cert, "GIT_SSL_CERT");
412 #if LIBCURL_VERSION_NUM >= 0x070903
413 set_from_env(&ssl_key, "GIT_SSL_KEY");
414 #endif
415 #if LIBCURL_VERSION_NUM >= 0x070908
416 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
417 #endif
418 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
419
420 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
421
422 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
423 if (low_speed_limit != NULL)
424 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
425 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
426 if (low_speed_time != NULL)
427 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
428
429 if (curl_ssl_verify == -1)
430 curl_ssl_verify = 1;
431
432 curl_session_count = 0;
433 #ifdef USE_CURL_MULTI
434 if (max_requests < 1)
435 max_requests = DEFAULT_MAX_REQUESTS;
436 #endif
437
438 if (getenv("GIT_CURL_FTP_NO_EPSV"))
439 curl_ftp_no_epsv = 1;
440
441 if (remote && remote->url && remote->url[0]) {
442 http_auth_init(remote->url[0]);
443 if (!ssl_cert_password_required &&
444 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
445 !prefixcmp(remote->url[0], "https://"))
446 ssl_cert_password_required = 1;
447 }
448
449 #ifndef NO_CURL_EASY_DUPHANDLE
450 curl_default = get_curl_handle();
451 #endif
452 }
453
454 void http_cleanup(void)
455 {
456 struct active_request_slot *slot = active_queue_head;
457
458 while (slot != NULL) {
459 struct active_request_slot *next = slot->next;
460 if (slot->curl != NULL) {
461 #ifdef USE_CURL_MULTI
462 curl_multi_remove_handle(curlm, slot->curl);
463 #endif
464 curl_easy_cleanup(slot->curl);
465 }
466 free(slot);
467 slot = next;
468 }
469 active_queue_head = NULL;
470
471 #ifndef NO_CURL_EASY_DUPHANDLE
472 curl_easy_cleanup(curl_default);
473 #endif
474
475 #ifdef USE_CURL_MULTI
476 curl_multi_cleanup(curlm);
477 #endif
478 curl_global_cleanup();
479
480 curl_slist_free_all(pragma_header);
481 pragma_header = NULL;
482
483 curl_slist_free_all(no_pragma_header);
484 no_pragma_header = NULL;
485
486 if (curl_http_proxy) {
487 free((void *)curl_http_proxy);
488 curl_http_proxy = NULL;
489 }
490
491 if (ssl_cert_password != NULL) {
492 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
493 free(ssl_cert_password);
494 ssl_cert_password = NULL;
495 }
496 ssl_cert_password_required = 0;
497 }
498
499 struct active_request_slot *get_active_slot(void)
500 {
501 struct active_request_slot *slot = active_queue_head;
502 struct active_request_slot *newslot;
503
504 #ifdef USE_CURL_MULTI
505 int num_transfers;
506
507 /* Wait for a slot to open up if the queue is full */
508 while (active_requests >= max_requests) {
509 curl_multi_perform(curlm, &num_transfers);
510 if (num_transfers < active_requests)
511 process_curl_messages();
512 }
513 #endif
514
515 while (slot != NULL && slot->in_use)
516 slot = slot->next;
517
518 if (slot == NULL) {
519 newslot = xmalloc(sizeof(*newslot));
520 newslot->curl = NULL;
521 newslot->in_use = 0;
522 newslot->next = NULL;
523
524 slot = active_queue_head;
525 if (slot == NULL) {
526 active_queue_head = newslot;
527 } else {
528 while (slot->next != NULL)
529 slot = slot->next;
530 slot->next = newslot;
531 }
532 slot = newslot;
533 }
534
535 if (slot->curl == NULL) {
536 #ifdef NO_CURL_EASY_DUPHANDLE
537 slot->curl = get_curl_handle();
538 #else
539 slot->curl = curl_easy_duphandle(curl_default);
540 #endif
541 curl_session_count++;
542 }
543
544 active_requests++;
545 slot->in_use = 1;
546 slot->local = NULL;
547 slot->results = NULL;
548 slot->finished = NULL;
549 slot->callback_data = NULL;
550 slot->callback_func = NULL;
551 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
552 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
553 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
554 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
555 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
556 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
557 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
558 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
559 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
560
561 return slot;
562 }
563
564 int start_active_slot(struct active_request_slot *slot)
565 {
566 #ifdef USE_CURL_MULTI
567 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
568 int num_transfers;
569
570 if (curlm_result != CURLM_OK &&
571 curlm_result != CURLM_CALL_MULTI_PERFORM) {
572 active_requests--;
573 slot->in_use = 0;
574 return 0;
575 }
576
577 /*
578 * We know there must be something to do, since we just added
579 * something.
580 */
581 curl_multi_perform(curlm, &num_transfers);
582 #endif
583 return 1;
584 }
585
586 #ifdef USE_CURL_MULTI
587 struct fill_chain {
588 void *data;
589 int (*fill)(void *);
590 struct fill_chain *next;
591 };
592
593 static struct fill_chain *fill_cfg;
594
595 void add_fill_function(void *data, int (*fill)(void *))
596 {
597 struct fill_chain *new = xmalloc(sizeof(*new));
598 struct fill_chain **linkp = &fill_cfg;
599 new->data = data;
600 new->fill = fill;
601 new->next = NULL;
602 while (*linkp)
603 linkp = &(*linkp)->next;
604 *linkp = new;
605 }
606
607 void fill_active_slots(void)
608 {
609 struct active_request_slot *slot = active_queue_head;
610
611 while (active_requests < max_requests) {
612 struct fill_chain *fill;
613 for (fill = fill_cfg; fill; fill = fill->next)
614 if (fill->fill(fill->data))
615 break;
616
617 if (!fill)
618 break;
619 }
620
621 while (slot != NULL) {
622 if (!slot->in_use && slot->curl != NULL
623 && curl_session_count > min_curl_sessions) {
624 curl_easy_cleanup(slot->curl);
625 slot->curl = NULL;
626 curl_session_count--;
627 }
628 slot = slot->next;
629 }
630 }
631
632 void step_active_slots(void)
633 {
634 int num_transfers;
635 CURLMcode curlm_result;
636
637 do {
638 curlm_result = curl_multi_perform(curlm, &num_transfers);
639 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
640 if (num_transfers < active_requests) {
641 process_curl_messages();
642 fill_active_slots();
643 }
644 }
645 #endif
646
647 void run_active_slot(struct active_request_slot *slot)
648 {
649 #ifdef USE_CURL_MULTI
650 long last_pos = 0;
651 long current_pos;
652 fd_set readfds;
653 fd_set writefds;
654 fd_set excfds;
655 int max_fd;
656 struct timeval select_timeout;
657 int finished = 0;
658
659 slot->finished = &finished;
660 while (!finished) {
661 data_received = 0;
662 step_active_slots();
663
664 if (!data_received && slot->local != NULL) {
665 current_pos = ftell(slot->local);
666 if (current_pos > last_pos)
667 data_received++;
668 last_pos = current_pos;
669 }
670
671 if (slot->in_use && !data_received) {
672 max_fd = 0;
673 FD_ZERO(&readfds);
674 FD_ZERO(&writefds);
675 FD_ZERO(&excfds);
676 select_timeout.tv_sec = 0;
677 select_timeout.tv_usec = 50000;
678 select(max_fd, &readfds, &writefds,
679 &excfds, &select_timeout);
680 }
681 }
682 #else
683 while (slot->in_use) {
684 slot->curl_result = curl_easy_perform(slot->curl);
685 finish_active_slot(slot);
686 }
687 #endif
688 }
689
690 static void closedown_active_slot(struct active_request_slot *slot)
691 {
692 active_requests--;
693 slot->in_use = 0;
694 }
695
696 static void release_active_slot(struct active_request_slot *slot)
697 {
698 closedown_active_slot(slot);
699 if (slot->curl && curl_session_count > min_curl_sessions) {
700 #ifdef USE_CURL_MULTI
701 curl_multi_remove_handle(curlm, slot->curl);
702 #endif
703 curl_easy_cleanup(slot->curl);
704 slot->curl = NULL;
705 curl_session_count--;
706 }
707 #ifdef USE_CURL_MULTI
708 fill_active_slots();
709 #endif
710 }
711
712 void finish_active_slot(struct active_request_slot *slot)
713 {
714 closedown_active_slot(slot);
715 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
716
717 if (slot->finished != NULL)
718 (*slot->finished) = 1;
719
720 /* Store slot results so they can be read after the slot is reused */
721 if (slot->results != NULL) {
722 slot->results->curl_result = slot->curl_result;
723 slot->results->http_code = slot->http_code;
724 }
725
726 /* Run callback if appropriate */
727 if (slot->callback_func != NULL)
728 slot->callback_func(slot->callback_data);
729 }
730
731 void finish_all_active_slots(void)
732 {
733 struct active_request_slot *slot = active_queue_head;
734
735 while (slot != NULL)
736 if (slot->in_use) {
737 run_active_slot(slot);
738 slot = active_queue_head;
739 } else {
740 slot = slot->next;
741 }
742 }
743
744 /* Helpers for modifying and creating URLs */
745 static inline int needs_quote(int ch)
746 {
747 if (((ch >= 'A') && (ch <= 'Z'))
748 || ((ch >= 'a') && (ch <= 'z'))
749 || ((ch >= '0') && (ch <= '9'))
750 || (ch == '/')
751 || (ch == '-')
752 || (ch == '.'))
753 return 0;
754 return 1;
755 }
756
757 static inline int hex(int v)
758 {
759 if (v < 10)
760 return '0' + v;
761 else
762 return 'A' + v - 10;
763 }
764
765 static char *quote_ref_url(const char *base, const char *ref)
766 {
767 struct strbuf buf = STRBUF_INIT;
768 const char *cp;
769 int ch;
770
771 end_url_with_slash(&buf, base);
772
773 for (cp = ref; (ch = *cp) != 0; cp++)
774 if (needs_quote(ch))
775 strbuf_addf(&buf, "%%%02x", ch);
776 else
777 strbuf_addch(&buf, *cp);
778
779 return strbuf_detach(&buf, NULL);
780 }
781
782 void append_remote_object_url(struct strbuf *buf, const char *url,
783 const char *hex,
784 int only_two_digit_prefix)
785 {
786 end_url_with_slash(buf, url);
787
788 strbuf_addf(buf, "objects/%.*s/", 2, hex);
789 if (!only_two_digit_prefix)
790 strbuf_addf(buf, "%s", hex+2);
791 }
792
793 char *get_remote_object_url(const char *url, const char *hex,
794 int only_two_digit_prefix)
795 {
796 struct strbuf buf = STRBUF_INIT;
797 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
798 return strbuf_detach(&buf, NULL);
799 }
800
801 /* http_request() targets */
802 #define HTTP_REQUEST_STRBUF 0
803 #define HTTP_REQUEST_FILE 1
804
805 static int http_request(const char *url, void *result, int target, int options)
806 {
807 struct active_request_slot *slot;
808 struct slot_results results;
809 struct curl_slist *headers = NULL;
810 struct strbuf buf = STRBUF_INIT;
811 int ret;
812
813 slot = get_active_slot();
814 slot->results = &results;
815 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
816
817 if (result == NULL) {
818 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
819 } else {
820 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
821 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
822
823 if (target == HTTP_REQUEST_FILE) {
824 long posn = ftell(result);
825 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
826 fwrite);
827 if (posn > 0) {
828 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
829 headers = curl_slist_append(headers, buf.buf);
830 strbuf_reset(&buf);
831 }
832 slot->local = result;
833 } else
834 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
835 fwrite_buffer);
836 }
837
838 strbuf_addstr(&buf, "Pragma:");
839 if (options & HTTP_NO_CACHE)
840 strbuf_addstr(&buf, " no-cache");
841
842 headers = curl_slist_append(headers, buf.buf);
843
844 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
845 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
846
847 if (start_active_slot(slot)) {
848 run_active_slot(slot);
849 if (results.curl_result == CURLE_OK)
850 ret = HTTP_OK;
851 else if (missing_target(&results))
852 ret = HTTP_MISSING_TARGET;
853 else if (results.http_code == 401) {
854 if (user_name) {
855 ret = HTTP_NOAUTH;
856 } else {
857 /*
858 * git_getpass is needed here because its very likely stdin/stdout are
859 * pipes to our parent process. So we instead need to use /dev/tty,
860 * but that is non-portable. Using git_getpass() can at least be stubbed
861 * on other platforms with a different implementation if/when necessary.
862 */
863 user_name = xstrdup(git_getpass("Username: "));
864 init_curl_http_auth(slot->curl);
865 ret = HTTP_REAUTH;
866 }
867 } else {
868 if (!curl_errorstr[0])
869 strlcpy(curl_errorstr,
870 curl_easy_strerror(results.curl_result),
871 sizeof(curl_errorstr));
872 ret = HTTP_ERROR;
873 }
874 } else {
875 error("Unable to start HTTP request for %s", url);
876 ret = HTTP_START_FAILED;
877 }
878
879 slot->local = NULL;
880 curl_slist_free_all(headers);
881 strbuf_release(&buf);
882
883 return ret;
884 }
885
886 int http_get_strbuf(const char *url, struct strbuf *result, int options)
887 {
888 int http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
889 if (http_ret == HTTP_REAUTH) {
890 http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
891 }
892 return http_ret;
893 }
894
895 /*
896 * Downloads an url and stores the result in the given file.
897 *
898 * If a previous interrupted download is detected (i.e. a previous temporary
899 * file is still around) the download is resumed.
900 */
901 static int http_get_file(const char *url, const char *filename, int options)
902 {
903 int ret;
904 struct strbuf tmpfile = STRBUF_INIT;
905 FILE *result;
906
907 strbuf_addf(&tmpfile, "%s.temp", filename);
908 result = fopen(tmpfile.buf, "a");
909 if (! result) {
910 error("Unable to open local file %s", tmpfile.buf);
911 ret = HTTP_ERROR;
912 goto cleanup;
913 }
914
915 ret = http_request(url, result, HTTP_REQUEST_FILE, options);
916 fclose(result);
917
918 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
919 ret = HTTP_ERROR;
920 cleanup:
921 strbuf_release(&tmpfile);
922 return ret;
923 }
924
925 int http_error(const char *url, int ret)
926 {
927 /* http_request has already handled HTTP_START_FAILED. */
928 if (ret != HTTP_START_FAILED)
929 error("%s while accessing %s", curl_errorstr, url);
930
931 return ret;
932 }
933
934 int http_fetch_ref(const char *base, struct ref *ref)
935 {
936 char *url;
937 struct strbuf buffer = STRBUF_INIT;
938 int ret = -1;
939
940 url = quote_ref_url(base, ref->name);
941 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
942 strbuf_rtrim(&buffer);
943 if (buffer.len == 40)
944 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
945 else if (!prefixcmp(buffer.buf, "ref: ")) {
946 ref->symref = xstrdup(buffer.buf + 5);
947 ret = 0;
948 }
949 }
950
951 strbuf_release(&buffer);
952 free(url);
953 return ret;
954 }
955
956 /* Helpers for fetching packs */
957 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
958 {
959 char *url, *tmp;
960 struct strbuf buf = STRBUF_INIT;
961
962 if (http_is_verbose)
963 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
964
965 end_url_with_slash(&buf, base_url);
966 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
967 url = strbuf_detach(&buf, NULL);
968
969 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
970 tmp = strbuf_detach(&buf, NULL);
971
972 if (http_get_file(url, tmp, 0) != HTTP_OK) {
973 error("Unable to get pack index %s\n", url);
974 free(tmp);
975 tmp = NULL;
976 }
977
978 free(url);
979 return tmp;
980 }
981
982 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
983 unsigned char *sha1, const char *base_url)
984 {
985 struct packed_git *new_pack;
986 char *tmp_idx = NULL;
987 int ret;
988
989 if (has_pack_index(sha1)) {
990 new_pack = parse_pack_index(sha1, NULL);
991 if (!new_pack)
992 return -1; /* parse_pack_index() already issued error message */
993 goto add_pack;
994 }
995
996 tmp_idx = fetch_pack_index(sha1, base_url);
997 if (!tmp_idx)
998 return -1;
999
1000 new_pack = parse_pack_index(sha1, tmp_idx);
1001 if (!new_pack) {
1002 unlink(tmp_idx);
1003 free(tmp_idx);
1004
1005 return -1; /* parse_pack_index() already issued error message */
1006 }
1007
1008 ret = verify_pack_index(new_pack);
1009 if (!ret) {
1010 close_pack_index(new_pack);
1011 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1012 }
1013 free(tmp_idx);
1014 if (ret)
1015 return -1;
1016
1017 add_pack:
1018 new_pack->next = *packs_head;
1019 *packs_head = new_pack;
1020 return 0;
1021 }
1022
1023 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1024 {
1025 int ret = 0, i = 0;
1026 char *url, *data;
1027 struct strbuf buf = STRBUF_INIT;
1028 unsigned char sha1[20];
1029
1030 end_url_with_slash(&buf, base_url);
1031 strbuf_addstr(&buf, "objects/info/packs");
1032 url = strbuf_detach(&buf, NULL);
1033
1034 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1035 if (ret != HTTP_OK)
1036 goto cleanup;
1037
1038 data = buf.buf;
1039 while (i < buf.len) {
1040 switch (data[i]) {
1041 case 'P':
1042 i++;
1043 if (i + 52 <= buf.len &&
1044 !prefixcmp(data + i, " pack-") &&
1045 !prefixcmp(data + i + 46, ".pack\n")) {
1046 get_sha1_hex(data + i + 6, sha1);
1047 fetch_and_setup_pack_index(packs_head, sha1,
1048 base_url);
1049 i += 51;
1050 break;
1051 }
1052 default:
1053 while (i < buf.len && data[i] != '\n')
1054 i++;
1055 }
1056 i++;
1057 }
1058
1059 cleanup:
1060 free(url);
1061 return ret;
1062 }
1063
1064 void release_http_pack_request(struct http_pack_request *preq)
1065 {
1066 if (preq->packfile != NULL) {
1067 fclose(preq->packfile);
1068 preq->packfile = NULL;
1069 preq->slot->local = NULL;
1070 }
1071 if (preq->range_header != NULL) {
1072 curl_slist_free_all(preq->range_header);
1073 preq->range_header = NULL;
1074 }
1075 preq->slot = NULL;
1076 free(preq->url);
1077 }
1078
1079 int finish_http_pack_request(struct http_pack_request *preq)
1080 {
1081 struct packed_git **lst;
1082 struct packed_git *p = preq->target;
1083 char *tmp_idx;
1084 struct child_process ip;
1085 const char *ip_argv[8];
1086
1087 close_pack_index(p);
1088
1089 fclose(preq->packfile);
1090 preq->packfile = NULL;
1091 preq->slot->local = NULL;
1092
1093 lst = preq->lst;
1094 while (*lst != p)
1095 lst = &((*lst)->next);
1096 *lst = (*lst)->next;
1097
1098 tmp_idx = xstrdup(preq->tmpfile);
1099 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1100 ".idx.temp");
1101
1102 ip_argv[0] = "index-pack";
1103 ip_argv[1] = "-o";
1104 ip_argv[2] = tmp_idx;
1105 ip_argv[3] = preq->tmpfile;
1106 ip_argv[4] = NULL;
1107
1108 memset(&ip, 0, sizeof(ip));
1109 ip.argv = ip_argv;
1110 ip.git_cmd = 1;
1111 ip.no_stdin = 1;
1112 ip.no_stdout = 1;
1113
1114 if (run_command(&ip)) {
1115 unlink(preq->tmpfile);
1116 unlink(tmp_idx);
1117 free(tmp_idx);
1118 return -1;
1119 }
1120
1121 unlink(sha1_pack_index_name(p->sha1));
1122
1123 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1124 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1125 free(tmp_idx);
1126 return -1;
1127 }
1128
1129 install_packed_git(p);
1130 free(tmp_idx);
1131 return 0;
1132 }
1133
1134 struct http_pack_request *new_http_pack_request(
1135 struct packed_git *target, const char *base_url)
1136 {
1137 long prev_posn = 0;
1138 char range[RANGE_HEADER_SIZE];
1139 struct strbuf buf = STRBUF_INIT;
1140 struct http_pack_request *preq;
1141
1142 preq = xcalloc(1, sizeof(*preq));
1143 preq->target = target;
1144
1145 end_url_with_slash(&buf, base_url);
1146 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1147 sha1_to_hex(target->sha1));
1148 preq->url = strbuf_detach(&buf, NULL);
1149
1150 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1151 sha1_pack_name(target->sha1));
1152 preq->packfile = fopen(preq->tmpfile, "a");
1153 if (!preq->packfile) {
1154 error("Unable to open local file %s for pack",
1155 preq->tmpfile);
1156 goto abort;
1157 }
1158
1159 preq->slot = get_active_slot();
1160 preq->slot->local = preq->packfile;
1161 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1162 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1163 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1164 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1165 no_pragma_header);
1166
1167 /*
1168 * If there is data present from a previous transfer attempt,
1169 * resume where it left off
1170 */
1171 prev_posn = ftell(preq->packfile);
1172 if (prev_posn>0) {
1173 if (http_is_verbose)
1174 fprintf(stderr,
1175 "Resuming fetch of pack %s at byte %ld\n",
1176 sha1_to_hex(target->sha1), prev_posn);
1177 sprintf(range, "Range: bytes=%ld-", prev_posn);
1178 preq->range_header = curl_slist_append(NULL, range);
1179 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1180 preq->range_header);
1181 }
1182
1183 return preq;
1184
1185 abort:
1186 free(preq->url);
1187 free(preq);
1188 return NULL;
1189 }
1190
1191 /* Helpers for fetching objects (loose) */
1192 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1193 void *data)
1194 {
1195 unsigned char expn[4096];
1196 size_t size = eltsize * nmemb;
1197 int posn = 0;
1198 struct http_object_request *freq =
1199 (struct http_object_request *)data;
1200 do {
1201 ssize_t retval = xwrite(freq->localfile,
1202 (char *) ptr + posn, size - posn);
1203 if (retval < 0)
1204 return posn;
1205 posn += retval;
1206 } while (posn < size);
1207
1208 freq->stream.avail_in = size;
1209 freq->stream.next_in = (void *)ptr;
1210 do {
1211 freq->stream.next_out = expn;
1212 freq->stream.avail_out = sizeof(expn);
1213 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1214 git_SHA1_Update(&freq->c, expn,
1215 sizeof(expn) - freq->stream.avail_out);
1216 } while (freq->stream.avail_in && freq->zret == Z_OK);
1217 data_received++;
1218 return size;
1219 }
1220
1221 struct http_object_request *new_http_object_request(const char *base_url,
1222 unsigned char *sha1)
1223 {
1224 char *hex = sha1_to_hex(sha1);
1225 char *filename;
1226 char prevfile[PATH_MAX];
1227 int prevlocal;
1228 char prev_buf[PREV_BUF_SIZE];
1229 ssize_t prev_read = 0;
1230 long prev_posn = 0;
1231 char range[RANGE_HEADER_SIZE];
1232 struct curl_slist *range_header = NULL;
1233 struct http_object_request *freq;
1234
1235 freq = xcalloc(1, sizeof(*freq));
1236 hashcpy(freq->sha1, sha1);
1237 freq->localfile = -1;
1238
1239 filename = sha1_file_name(sha1);
1240 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1241 "%s.temp", filename);
1242
1243 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1244 unlink_or_warn(prevfile);
1245 rename(freq->tmpfile, prevfile);
1246 unlink_or_warn(freq->tmpfile);
1247
1248 if (freq->localfile != -1)
1249 error("fd leakage in start: %d", freq->localfile);
1250 freq->localfile = open(freq->tmpfile,
1251 O_WRONLY | O_CREAT | O_EXCL, 0666);
1252 /*
1253 * This could have failed due to the "lazy directory creation";
1254 * try to mkdir the last path component.
1255 */
1256 if (freq->localfile < 0 && errno == ENOENT) {
1257 char *dir = strrchr(freq->tmpfile, '/');
1258 if (dir) {
1259 *dir = 0;
1260 mkdir(freq->tmpfile, 0777);
1261 *dir = '/';
1262 }
1263 freq->localfile = open(freq->tmpfile,
1264 O_WRONLY | O_CREAT | O_EXCL, 0666);
1265 }
1266
1267 if (freq->localfile < 0) {
1268 error("Couldn't create temporary file %s: %s",
1269 freq->tmpfile, strerror(errno));
1270 goto abort;
1271 }
1272
1273 git_inflate_init(&freq->stream);
1274
1275 git_SHA1_Init(&freq->c);
1276
1277 freq->url = get_remote_object_url(base_url, hex, 0);
1278
1279 /*
1280 * If a previous temp file is present, process what was already
1281 * fetched.
1282 */
1283 prevlocal = open(prevfile, O_RDONLY);
1284 if (prevlocal != -1) {
1285 do {
1286 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1287 if (prev_read>0) {
1288 if (fwrite_sha1_file(prev_buf,
1289 1,
1290 prev_read,
1291 freq) == prev_read) {
1292 prev_posn += prev_read;
1293 } else {
1294 prev_read = -1;
1295 }
1296 }
1297 } while (prev_read > 0);
1298 close(prevlocal);
1299 }
1300 unlink_or_warn(prevfile);
1301
1302 /*
1303 * Reset inflate/SHA1 if there was an error reading the previous temp
1304 * file; also rewind to the beginning of the local file.
1305 */
1306 if (prev_read == -1) {
1307 memset(&freq->stream, 0, sizeof(freq->stream));
1308 git_inflate_init(&freq->stream);
1309 git_SHA1_Init(&freq->c);
1310 if (prev_posn>0) {
1311 prev_posn = 0;
1312 lseek(freq->localfile, 0, SEEK_SET);
1313 if (ftruncate(freq->localfile, 0) < 0) {
1314 error("Couldn't truncate temporary file %s: %s",
1315 freq->tmpfile, strerror(errno));
1316 goto abort;
1317 }
1318 }
1319 }
1320
1321 freq->slot = get_active_slot();
1322
1323 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1324 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1325 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1326 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1327 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1328
1329 /*
1330 * If we have successfully processed data from a previous fetch
1331 * attempt, only fetch the data we don't already have.
1332 */
1333 if (prev_posn>0) {
1334 if (http_is_verbose)
1335 fprintf(stderr,
1336 "Resuming fetch of object %s at byte %ld\n",
1337 hex, prev_posn);
1338 sprintf(range, "Range: bytes=%ld-", prev_posn);
1339 range_header = curl_slist_append(range_header, range);
1340 curl_easy_setopt(freq->slot->curl,
1341 CURLOPT_HTTPHEADER, range_header);
1342 }
1343
1344 return freq;
1345
1346 abort:
1347 free(freq->url);
1348 free(freq);
1349 return NULL;
1350 }
1351
1352 void process_http_object_request(struct http_object_request *freq)
1353 {
1354 if (freq->slot == NULL)
1355 return;
1356 freq->curl_result = freq->slot->curl_result;
1357 freq->http_code = freq->slot->http_code;
1358 freq->slot = NULL;
1359 }
1360
1361 int finish_http_object_request(struct http_object_request *freq)
1362 {
1363 struct stat st;
1364
1365 close(freq->localfile);
1366 freq->localfile = -1;
1367
1368 process_http_object_request(freq);
1369
1370 if (freq->http_code == 416) {
1371 warning("requested range invalid; we may already have all the data.");
1372 } else if (freq->curl_result != CURLE_OK) {
1373 if (stat(freq->tmpfile, &st) == 0)
1374 if (st.st_size == 0)
1375 unlink_or_warn(freq->tmpfile);
1376 return -1;
1377 }
1378
1379 git_inflate_end(&freq->stream);
1380 git_SHA1_Final(freq->real_sha1, &freq->c);
1381 if (freq->zret != Z_STREAM_END) {
1382 unlink_or_warn(freq->tmpfile);
1383 return -1;
1384 }
1385 if (hashcmp(freq->sha1, freq->real_sha1)) {
1386 unlink_or_warn(freq->tmpfile);
1387 return -1;
1388 }
1389 freq->rename =
1390 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1391
1392 return freq->rename;
1393 }
1394
1395 void abort_http_object_request(struct http_object_request *freq)
1396 {
1397 unlink_or_warn(freq->tmpfile);
1398
1399 release_http_object_request(freq);
1400 }
1401
1402 void release_http_object_request(struct http_object_request *freq)
1403 {
1404 if (freq->localfile != -1) {
1405 close(freq->localfile);
1406 freq->localfile = -1;
1407 }
1408 if (freq->url != NULL) {
1409 free(freq->url);
1410 freq->url = NULL;
1411 }
1412 if (freq->slot != NULL) {
1413 freq->slot->callback_func = NULL;
1414 freq->slot->callback_data = NULL;
1415 release_active_slot(freq->slot);
1416 freq->slot = NULL;
1417 }
1418 }
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