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mingw: do not hide bare repositories
[git/dscho.git] / http.c
blobe9c6d22809f5792ed796356092f8987ef4a6e2af
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 char *user_name, *user_pass;
46 static const char *user_agent;
47
48 #if LIBCURL_VERSION_NUM >= 0x071700
49 /* Use CURLOPT_KEYPASSWD as is */
50 #elif LIBCURL_VERSION_NUM >= 0x070903
51 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
52 #else
53 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
54 #endif
55
56 static char *ssl_cert_password;
57 static int ssl_cert_password_required;
58
59 static struct curl_slist *pragma_header;
60 static struct curl_slist *no_pragma_header;
61
62 static struct active_request_slot *active_queue_head;
63
64 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
65 {
66 size_t size = eltsize * nmemb;
67 struct buffer *buffer = buffer_;
68
69 if (size > buffer->buf.len - buffer->posn)
70 size = buffer->buf.len - buffer->posn;
71 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
72 buffer->posn += size;
73
74 return size;
75 }
76
77 #ifndef NO_CURL_IOCTL
78 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
79 {
80 struct buffer *buffer = clientp;
81
82 switch (cmd) {
83 case CURLIOCMD_NOP:
84 return CURLIOE_OK;
85
86 case CURLIOCMD_RESTARTREAD:
87 buffer->posn = 0;
88 return CURLIOE_OK;
89
90 default:
91 return CURLIOE_UNKNOWNCMD;
92 }
93 }
94 #endif
95
96 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
97 {
98 size_t size = eltsize * nmemb;
99 struct strbuf *buffer = buffer_;
100
101 strbuf_add(buffer, ptr, size);
102 data_received++;
103 return size;
104 }
105
106 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
107 {
108 data_received++;
109 return eltsize * nmemb;
110 }
111
112 #ifdef USE_CURL_MULTI
113 static void process_curl_messages(void)
114 {
115 int num_messages;
116 struct active_request_slot *slot;
117 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
118
119 while (curl_message != NULL) {
120 if (curl_message->msg == CURLMSG_DONE) {
121 int curl_result = curl_message->data.result;
122 slot = active_queue_head;
123 while (slot != NULL &&
124 slot->curl != curl_message->easy_handle)
125 slot = slot->next;
126 if (slot != NULL) {
127 curl_multi_remove_handle(curlm, slot->curl);
128 slot->curl_result = curl_result;
129 finish_active_slot(slot);
130 } else {
131 fprintf(stderr, "Received DONE message for unknown request!\n");
132 }
133 } else {
134 fprintf(stderr, "Unknown CURL message received: %d\n",
135 (int)curl_message->msg);
136 }
137 curl_message = curl_multi_info_read(curlm, &num_messages);
138 }
139 }
140 #endif
141
142 static int git_config_path(const char **result,
143 const char *var, const char *value)
144 {
145 if (git_config_string(result, var, value))
146 return 1;
147 #ifdef __MINGW32__
148 if (**result == '/')
149 *result = system_path((*result) + 1);
150 #endif
151 return 0;
152 }
153
154 static int http_options(const char *var, const char *value, void *cb)
155 {
156 if (!strcmp("http.sslverify", var)) {
157 curl_ssl_verify = git_config_bool(var, value);
158 return 0;
159 }
160 if (!strcmp("http.sslcert", var))
161 return git_config_path(&ssl_cert, var, value);
162 #if LIBCURL_VERSION_NUM >= 0x070903
163 if (!strcmp("http.sslkey", var))
164 return git_config_path(&ssl_key, var, value);
165 #endif
166 #if LIBCURL_VERSION_NUM >= 0x070908
167 if (!strcmp("http.sslcapath", var))
168 return git_config_path(&ssl_capath, var, value);
169 #endif
170 if (!strcmp("http.sslcainfo", var))
171 return git_config_path(&ssl_cainfo, var, value);
172 if (!strcmp("http.sslcertpasswordprotected", var)) {
173 if (git_config_bool(var, value))
174 ssl_cert_password_required = 1;
175 return 0;
176 }
177 if (!strcmp("http.minsessions", var)) {
178 min_curl_sessions = git_config_int(var, value);
179 #ifndef USE_CURL_MULTI
180 if (min_curl_sessions > 1)
181 min_curl_sessions = 1;
182 #endif
183 return 0;
184 }
185 #ifdef USE_CURL_MULTI
186 if (!strcmp("http.maxrequests", var)) {
187 max_requests = git_config_int(var, value);
188 return 0;
189 }
190 #endif
191 if (!strcmp("http.lowspeedlimit", var)) {
192 curl_low_speed_limit = (long)git_config_int(var, value);
193 return 0;
194 }
195 if (!strcmp("http.lowspeedtime", var)) {
196 curl_low_speed_time = (long)git_config_int(var, value);
197 return 0;
198 }
199
200 if (!strcmp("http.noepsv", var)) {
201 curl_ftp_no_epsv = git_config_bool(var, value);
202 return 0;
203 }
204 if (!strcmp("http.proxy", var))
205 return git_config_string(&curl_http_proxy, var, value);
206
207 if (!strcmp("http.postbuffer", var)) {
208 http_post_buffer = git_config_int(var, value);
209 if (http_post_buffer < LARGE_PACKET_MAX)
210 http_post_buffer = LARGE_PACKET_MAX;
211 return 0;
212 }
213
214 if (!strcmp("http.useragent", var))
215 return git_config_string(&user_agent, var, value);
216
217 /* Fall back on the default ones */
218 return git_default_config(var, value, cb);
219 }
220
221 static void init_curl_http_auth(CURL *result)
222 {
223 if (user_name) {
224 struct strbuf up = STRBUF_INIT;
225 if (!user_pass)
226 user_pass = xstrdup(git_getpass("Password: "));
227 strbuf_addf(&up, "%s:%s", user_name, user_pass);
228 curl_easy_setopt(result, CURLOPT_USERPWD,
229 strbuf_detach(&up, NULL));
230 }
231 }
232
233 static int has_cert_password(void)
234 {
235 if (ssl_cert_password != NULL)
236 return 1;
237 if (ssl_cert == NULL || ssl_cert_password_required != 1)
238 return 0;
239 /* Only prompt the user once. */
240 ssl_cert_password_required = -1;
241 ssl_cert_password = git_getpass("Certificate Password: ");
242 if (ssl_cert_password != NULL) {
243 ssl_cert_password = xstrdup(ssl_cert_password);
244 return 1;
245 } else
246 return 0;
247 }
248
249 static CURL *get_curl_handle(void)
250 {
251 CURL *result = curl_easy_init();
252
253 if (!curl_ssl_verify) {
254 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
255 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
256 } else {
257 /* Verify authenticity of the peer's certificate */
258 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
259 /* The name in the cert must match whom we tried to connect */
260 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
261 }
262
263 #if LIBCURL_VERSION_NUM >= 0x070907
264 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
265 #endif
266 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
267 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
268 #endif
269
270 init_curl_http_auth(result);
271
272 if (ssl_cert != NULL)
273 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
274 if (has_cert_password())
275 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
276 #if LIBCURL_VERSION_NUM >= 0x070903
277 if (ssl_key != NULL)
278 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
279 #endif
280 #if LIBCURL_VERSION_NUM >= 0x070908
281 if (ssl_capath != NULL)
282 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
283 #endif
284 if (ssl_cainfo != NULL)
285 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
286 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
287
288 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
289 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
290 curl_low_speed_limit);
291 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
292 curl_low_speed_time);
293 }
294
295 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
296 #if LIBCURL_VERSION_NUM >= 0x071301
297 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
298 #elif LIBCURL_VERSION_NUM >= 0x071101
299 curl_easy_setopt(result, CURLOPT_POST301, 1);
300 #endif
301
302 if (getenv("GIT_CURL_VERBOSE"))
303 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
304
305 curl_easy_setopt(result, CURLOPT_USERAGENT,
306 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
307
308 if (curl_ftp_no_epsv)
309 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
310
311 if (curl_http_proxy)
312 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
313
314 return result;
315 }
316
317 static void http_auth_init(const char *url)
318 {
319 char *at, *colon, *cp, *slash, *decoded;
320 int len;
321
322 cp = strstr(url, "://");
323 if (!cp)
324 return;
325
326 /*
327 * Ok, the URL looks like "proto://something". Which one?
328 * "proto://<user>:<pass>@<host>/...",
329 * "proto://<user>@<host>/...", or just
330 * "proto://<host>/..."?
331 */
332 cp += 3;
333 at = strchr(cp, '@');
334 colon = strchr(cp, ':');
335 slash = strchrnul(cp, '/');
336 if (!at || slash <= at)
337 return; /* No credentials */
338 if (!colon || at <= colon) {
339 /* Only username */
340 len = at - cp;
341 user_name = xmalloc(len + 1);
342 memcpy(user_name, cp, len);
343 user_name[len] = '\0';
344 decoded = url_decode(user_name);
345 free(user_name);
346 user_name = decoded;
347 user_pass = NULL;
348 } else {
349 len = colon - cp;
350 user_name = xmalloc(len + 1);
351 memcpy(user_name, cp, len);
352 user_name[len] = '\0';
353 decoded = url_decode(user_name);
354 free(user_name);
355 user_name = decoded;
356 len = at - (colon + 1);
357 user_pass = xmalloc(len + 1);
358 memcpy(user_pass, colon + 1, len);
359 user_pass[len] = '\0';
360 decoded = url_decode(user_pass);
361 free(user_pass);
362 user_pass = decoded;
363 }
364 }
365
366 static void set_from_env(const char **var, const char *envname)
367 {
368 const char *val = getenv(envname);
369 if (val)
370 *var = val;
371 }
372
373 void http_init(struct remote *remote)
374 {
375 char *low_speed_limit;
376 char *low_speed_time;
377
378 http_is_verbose = 0;
379
380 git_config(http_options, NULL);
381
382 curl_global_init(CURL_GLOBAL_ALL);
383
384 if (remote && remote->http_proxy)
385 curl_http_proxy = xstrdup(remote->http_proxy);
386
387 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
388 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
389
390 #ifdef USE_CURL_MULTI
391 {
392 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
393 if (http_max_requests != NULL)
394 max_requests = atoi(http_max_requests);
395 }
396
397 curlm = curl_multi_init();
398 if (curlm == NULL) {
399 fprintf(stderr, "Error creating curl multi handle.\n");
400 exit(1);
401 }
402 #endif
403
404 if (getenv("GIT_SSL_NO_VERIFY"))
405 curl_ssl_verify = 0;
406
407 set_from_env(&ssl_cert, "GIT_SSL_CERT");
408 #if LIBCURL_VERSION_NUM >= 0x070903
409 set_from_env(&ssl_key, "GIT_SSL_KEY");
410 #endif
411 #if LIBCURL_VERSION_NUM >= 0x070908
412 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
413 #endif
414 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
415
416 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
417
418 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
419 if (low_speed_limit != NULL)
420 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
421 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
422 if (low_speed_time != NULL)
423 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
424
425 if (curl_ssl_verify == -1)
426 curl_ssl_verify = 1;
427
428 curl_session_count = 0;
429 #ifdef USE_CURL_MULTI
430 if (max_requests < 1)
431 max_requests = DEFAULT_MAX_REQUESTS;
432 #endif
433
434 if (getenv("GIT_CURL_FTP_NO_EPSV"))
435 curl_ftp_no_epsv = 1;
436
437 if (remote && remote->url && remote->url[0]) {
438 http_auth_init(remote->url[0]);
439 if (!ssl_cert_password_required &&
440 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
441 !prefixcmp(remote->url[0], "https://"))
442 ssl_cert_password_required = 1;
443 }
444
445 #ifndef NO_CURL_EASY_DUPHANDLE
446 curl_default = get_curl_handle();
447 #endif
448 }
449
450 void http_cleanup(void)
451 {
452 struct active_request_slot *slot = active_queue_head;
453
454 while (slot != NULL) {
455 struct active_request_slot *next = slot->next;
456 if (slot->curl != NULL) {
457 #ifdef USE_CURL_MULTI
458 curl_multi_remove_handle(curlm, slot->curl);
459 #endif
460 curl_easy_cleanup(slot->curl);
461 }
462 free(slot);
463 slot = next;
464 }
465 active_queue_head = NULL;
466
467 #ifndef NO_CURL_EASY_DUPHANDLE
468 curl_easy_cleanup(curl_default);
469 #endif
470
471 #ifdef USE_CURL_MULTI
472 curl_multi_cleanup(curlm);
473 #endif
474 curl_global_cleanup();
475
476 curl_slist_free_all(pragma_header);
477 pragma_header = NULL;
478
479 curl_slist_free_all(no_pragma_header);
480 no_pragma_header = NULL;
481
482 if (curl_http_proxy) {
483 free((void *)curl_http_proxy);
484 curl_http_proxy = NULL;
485 }
486
487 if (ssl_cert_password != NULL) {
488 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
489 free(ssl_cert_password);
490 ssl_cert_password = NULL;
491 }
492 ssl_cert_password_required = 0;
493 }
494
495 struct active_request_slot *get_active_slot(void)
496 {
497 struct active_request_slot *slot = active_queue_head;
498 struct active_request_slot *newslot;
499
500 #ifdef USE_CURL_MULTI
501 int num_transfers;
502
503 /* Wait for a slot to open up if the queue is full */
504 while (active_requests >= max_requests) {
505 curl_multi_perform(curlm, &num_transfers);
506 if (num_transfers < active_requests)
507 process_curl_messages();
508 }
509 #endif
510
511 while (slot != NULL && slot->in_use)
512 slot = slot->next;
513
514 if (slot == NULL) {
515 newslot = xmalloc(sizeof(*newslot));
516 newslot->curl = NULL;
517 newslot->in_use = 0;
518 newslot->next = NULL;
519
520 slot = active_queue_head;
521 if (slot == NULL) {
522 active_queue_head = newslot;
523 } else {
524 while (slot->next != NULL)
525 slot = slot->next;
526 slot->next = newslot;
527 }
528 slot = newslot;
529 }
530
531 if (slot->curl == NULL) {
532 #ifdef NO_CURL_EASY_DUPHANDLE
533 slot->curl = get_curl_handle();
534 #else
535 slot->curl = curl_easy_duphandle(curl_default);
536 #endif
537 curl_session_count++;
538 }
539
540 active_requests++;
541 slot->in_use = 1;
542 slot->local = NULL;
543 slot->results = NULL;
544 slot->finished = NULL;
545 slot->callback_data = NULL;
546 slot->callback_func = NULL;
547 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
548 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
549 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
550 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
551 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
552 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
553 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
554 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
555
556 return slot;
557 }
558
559 int start_active_slot(struct active_request_slot *slot)
560 {
561 #ifdef USE_CURL_MULTI
562 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
563 int num_transfers;
564
565 if (curlm_result != CURLM_OK &&
566 curlm_result != CURLM_CALL_MULTI_PERFORM) {
567 active_requests--;
568 slot->in_use = 0;
569 return 0;
570 }
571
572 /*
573 * We know there must be something to do, since we just added
574 * something.
575 */
576 curl_multi_perform(curlm, &num_transfers);
577 #endif
578 return 1;
579 }
580
581 #ifdef USE_CURL_MULTI
582 struct fill_chain {
583 void *data;
584 int (*fill)(void *);
585 struct fill_chain *next;
586 };
587
588 static struct fill_chain *fill_cfg;
589
590 void add_fill_function(void *data, int (*fill)(void *))
591 {
592 struct fill_chain *new = xmalloc(sizeof(*new));
593 struct fill_chain **linkp = &fill_cfg;
594 new->data = data;
595 new->fill = fill;
596 new->next = NULL;
597 while (*linkp)
598 linkp = &(*linkp)->next;
599 *linkp = new;
600 }
601
602 void fill_active_slots(void)
603 {
604 struct active_request_slot *slot = active_queue_head;
605
606 while (active_requests < max_requests) {
607 struct fill_chain *fill;
608 for (fill = fill_cfg; fill; fill = fill->next)
609 if (fill->fill(fill->data))
610 break;
611
612 if (!fill)
613 break;
614 }
615
616 while (slot != NULL) {
617 if (!slot->in_use && slot->curl != NULL
618 && curl_session_count > min_curl_sessions) {
619 curl_easy_cleanup(slot->curl);
620 slot->curl = NULL;
621 curl_session_count--;
622 }
623 slot = slot->next;
624 }
625 }
626
627 void step_active_slots(void)
628 {
629 int num_transfers;
630 CURLMcode curlm_result;
631
632 do {
633 curlm_result = curl_multi_perform(curlm, &num_transfers);
634 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
635 if (num_transfers < active_requests) {
636 process_curl_messages();
637 fill_active_slots();
638 }
639 }
640 #endif
641
642 void run_active_slot(struct active_request_slot *slot)
643 {
644 #ifdef USE_CURL_MULTI
645 long last_pos = 0;
646 long current_pos;
647 fd_set readfds;
648 fd_set writefds;
649 fd_set excfds;
650 int max_fd;
651 struct timeval select_timeout;
652 int finished = 0;
653
654 slot->finished = &finished;
655 while (!finished) {
656 data_received = 0;
657 step_active_slots();
658
659 if (!data_received && slot->local != NULL) {
660 current_pos = ftell(slot->local);
661 if (current_pos > last_pos)
662 data_received++;
663 last_pos = current_pos;
664 }
665
666 if (slot->in_use && !data_received) {
667 max_fd = 0;
668 FD_ZERO(&readfds);
669 FD_ZERO(&writefds);
670 FD_ZERO(&excfds);
671 select_timeout.tv_sec = 0;
672 select_timeout.tv_usec = 50000;
673 select(max_fd, &readfds, &writefds,
674 &excfds, &select_timeout);
675 }
676 }
677 #else
678 while (slot->in_use) {
679 slot->curl_result = curl_easy_perform(slot->curl);
680 finish_active_slot(slot);
681 }
682 #endif
683 }
684
685 static void closedown_active_slot(struct active_request_slot *slot)
686 {
687 active_requests--;
688 slot->in_use = 0;
689 }
690
691 static void release_active_slot(struct active_request_slot *slot)
692 {
693 closedown_active_slot(slot);
694 if (slot->curl && curl_session_count > min_curl_sessions) {
695 #ifdef USE_CURL_MULTI
696 curl_multi_remove_handle(curlm, slot->curl);
697 #endif
698 curl_easy_cleanup(slot->curl);
699 slot->curl = NULL;
700 curl_session_count--;
701 }
702 #ifdef USE_CURL_MULTI
703 fill_active_slots();
704 #endif
705 }
706
707 void finish_active_slot(struct active_request_slot *slot)
708 {
709 closedown_active_slot(slot);
710 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
711
712 if (slot->finished != NULL)
713 (*slot->finished) = 1;
714
715 /* Store slot results so they can be read after the slot is reused */
716 if (slot->results != NULL) {
717 slot->results->curl_result = slot->curl_result;
718 slot->results->http_code = slot->http_code;
719 }
720
721 /* Run callback if appropriate */
722 if (slot->callback_func != NULL)
723 slot->callback_func(slot->callback_data);
724 }
725
726 void finish_all_active_slots(void)
727 {
728 struct active_request_slot *slot = active_queue_head;
729
730 while (slot != NULL)
731 if (slot->in_use) {
732 run_active_slot(slot);
733 slot = active_queue_head;
734 } else {
735 slot = slot->next;
736 }
737 }
738
739 /* Helpers for modifying and creating URLs */
740 static inline int needs_quote(int ch)
741 {
742 if (((ch >= 'A') && (ch <= 'Z'))
743 || ((ch >= 'a') && (ch <= 'z'))
744 || ((ch >= '0') && (ch <= '9'))
745 || (ch == '/')
746 || (ch == '-')
747 || (ch == '.'))
748 return 0;
749 return 1;
750 }
751
752 static inline int hex(int v)
753 {
754 if (v < 10)
755 return '0' + v;
756 else
757 return 'A' + v - 10;
758 }
759
760 static char *quote_ref_url(const char *base, const char *ref)
761 {
762 struct strbuf buf = STRBUF_INIT;
763 const char *cp;
764 int ch;
765
766 end_url_with_slash(&buf, base);
767
768 for (cp = ref; (ch = *cp) != 0; cp++)
769 if (needs_quote(ch))
770 strbuf_addf(&buf, "%%%02x", ch);
771 else
772 strbuf_addch(&buf, *cp);
773
774 return strbuf_detach(&buf, NULL);
775 }
776
777 void append_remote_object_url(struct strbuf *buf, const char *url,
778 const char *hex,
779 int only_two_digit_prefix)
780 {
781 end_url_with_slash(buf, url);
782
783 strbuf_addf(buf, "objects/%.*s/", 2, hex);
784 if (!only_two_digit_prefix)
785 strbuf_addf(buf, "%s", hex+2);
786 }
787
788 char *get_remote_object_url(const char *url, const char *hex,
789 int only_two_digit_prefix)
790 {
791 struct strbuf buf = STRBUF_INIT;
792 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
793 return strbuf_detach(&buf, NULL);
794 }
795
796 /* http_request() targets */
797 #define HTTP_REQUEST_STRBUF 0
798 #define HTTP_REQUEST_FILE 1
799
800 static int http_request(const char *url, void *result, int target, int options)
801 {
802 struct active_request_slot *slot;
803 struct slot_results results;
804 struct curl_slist *headers = NULL;
805 struct strbuf buf = STRBUF_INIT;
806 int ret;
807
808 slot = get_active_slot();
809 slot->results = &results;
810 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
811
812 if (result == NULL) {
813 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
814 } else {
815 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
816 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
817
818 if (target == HTTP_REQUEST_FILE) {
819 long posn = ftell(result);
820 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
821 fwrite);
822 if (posn > 0) {
823 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
824 headers = curl_slist_append(headers, buf.buf);
825 strbuf_reset(&buf);
826 }
827 slot->local = result;
828 } else
829 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
830 fwrite_buffer);
831 }
832
833 strbuf_addstr(&buf, "Pragma:");
834 if (options & HTTP_NO_CACHE)
835 strbuf_addstr(&buf, " no-cache");
836
837 headers = curl_slist_append(headers, buf.buf);
838
839 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
840 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
841
842 if (start_active_slot(slot)) {
843 run_active_slot(slot);
844 if (results.curl_result == CURLE_OK)
845 ret = HTTP_OK;
846 else if (missing_target(&results))
847 ret = HTTP_MISSING_TARGET;
848 else if (results.http_code == 401) {
849 if (user_name) {
850 ret = HTTP_NOAUTH;
851 } else {
852 /*
853 * git_getpass is needed here because its very likely stdin/stdout are
854 * pipes to our parent process. So we instead need to use /dev/tty,
855 * but that is non-portable. Using git_getpass() can at least be stubbed
856 * on other platforms with a different implementation if/when necessary.
857 */
858 user_name = xstrdup(git_getpass("Username: "));
859 init_curl_http_auth(slot->curl);
860 ret = HTTP_REAUTH;
861 }
862 } else
863 ret = HTTP_ERROR;
864 } else {
865 error("Unable to start HTTP request for %s", url);
866 ret = HTTP_START_FAILED;
867 }
868
869 slot->local = NULL;
870 curl_slist_free_all(headers);
871 strbuf_release(&buf);
872
873 return ret;
874 }
875
876 int http_get_strbuf(const char *url, struct strbuf *result, int options)
877 {
878 int http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
879 if (http_ret == HTTP_REAUTH) {
880 http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
881 }
882 return http_ret;
883 }
884
885 /*
886 * Downloads an url and stores the result in the given file.
887 *
888 * If a previous interrupted download is detected (i.e. a previous temporary
889 * file is still around) the download is resumed.
890 */
891 static int http_get_file(const char *url, const char *filename, int options)
892 {
893 int ret;
894 struct strbuf tmpfile = STRBUF_INIT;
895 FILE *result;
896
897 strbuf_addf(&tmpfile, "%s.temp", filename);
898 result = fopen(tmpfile.buf, "a");
899 if (! result) {
900 error("Unable to open local file %s", tmpfile.buf);
901 ret = HTTP_ERROR;
902 goto cleanup;
903 }
904
905 ret = http_request(url, result, HTTP_REQUEST_FILE, options);
906 fclose(result);
907
908 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
909 ret = HTTP_ERROR;
910 cleanup:
911 strbuf_release(&tmpfile);
912 return ret;
913 }
914
915 int http_error(const char *url, int ret)
916 {
917 /* http_request has already handled HTTP_START_FAILED. */
918 if (ret != HTTP_START_FAILED)
919 error("%s while accessing %s\n", curl_errorstr, url);
920
921 return ret;
922 }
923
924 int http_fetch_ref(const char *base, struct ref *ref)
925 {
926 char *url;
927 struct strbuf buffer = STRBUF_INIT;
928 int ret = -1;
929
930 url = quote_ref_url(base, ref->name);
931 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
932 strbuf_rtrim(&buffer);
933 if (buffer.len == 40)
934 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
935 else if (!prefixcmp(buffer.buf, "ref: ")) {
936 ref->symref = xstrdup(buffer.buf + 5);
937 ret = 0;
938 }
939 }
940
941 strbuf_release(&buffer);
942 free(url);
943 return ret;
944 }
945
946 /* Helpers for fetching packs */
947 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
948 {
949 char *url, *tmp;
950 struct strbuf buf = STRBUF_INIT;
951
952 if (http_is_verbose)
953 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
954
955 end_url_with_slash(&buf, base_url);
956 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
957 url = strbuf_detach(&buf, NULL);
958
959 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
960 tmp = strbuf_detach(&buf, NULL);
961
962 if (http_get_file(url, tmp, 0) != HTTP_OK) {
963 error("Unable to get pack index %s\n", url);
964 free(tmp);
965 tmp = NULL;
966 }
967
968 free(url);
969 return tmp;
970 }
971
972 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
973 unsigned char *sha1, const char *base_url)
974 {
975 struct packed_git *new_pack;
976 char *tmp_idx = NULL;
977 int ret;
978
979 if (has_pack_index(sha1)) {
980 new_pack = parse_pack_index(sha1, NULL);
981 if (!new_pack)
982 return -1; /* parse_pack_index() already issued error message */
983 goto add_pack;
984 }
985
986 tmp_idx = fetch_pack_index(sha1, base_url);
987 if (!tmp_idx)
988 return -1;
989
990 new_pack = parse_pack_index(sha1, tmp_idx);
991 if (!new_pack) {
992 unlink(tmp_idx);
993 free(tmp_idx);
994
995 return -1; /* parse_pack_index() already issued error message */
996 }
997
998 ret = verify_pack_index(new_pack);
999 if (!ret) {
1000 close_pack_index(new_pack);
1001 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1002 }
1003 free(tmp_idx);
1004 if (ret)
1005 return -1;
1006
1007 add_pack:
1008 new_pack->next = *packs_head;
1009 *packs_head = new_pack;
1010 return 0;
1011 }
1012
1013 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1014 {
1015 int ret = 0, i = 0;
1016 char *url, *data;
1017 struct strbuf buf = STRBUF_INIT;
1018 unsigned char sha1[20];
1019
1020 end_url_with_slash(&buf, base_url);
1021 strbuf_addstr(&buf, "objects/info/packs");
1022 url = strbuf_detach(&buf, NULL);
1023
1024 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1025 if (ret != HTTP_OK)
1026 goto cleanup;
1027
1028 data = buf.buf;
1029 while (i < buf.len) {
1030 switch (data[i]) {
1031 case 'P':
1032 i++;
1033 if (i + 52 <= buf.len &&
1034 !prefixcmp(data + i, " pack-") &&
1035 !prefixcmp(data + i + 46, ".pack\n")) {
1036 get_sha1_hex(data + i + 6, sha1);
1037 fetch_and_setup_pack_index(packs_head, sha1,
1038 base_url);
1039 i += 51;
1040 break;
1041 }
1042 default:
1043 while (i < buf.len && data[i] != '\n')
1044 i++;
1045 }
1046 i++;
1047 }
1048
1049 cleanup:
1050 free(url);
1051 return ret;
1052 }
1053
1054 void release_http_pack_request(struct http_pack_request *preq)
1055 {
1056 if (preq->packfile != NULL) {
1057 fclose(preq->packfile);
1058 preq->packfile = NULL;
1059 preq->slot->local = NULL;
1060 }
1061 if (preq->range_header != NULL) {
1062 curl_slist_free_all(preq->range_header);
1063 preq->range_header = NULL;
1064 }
1065 preq->slot = NULL;
1066 free(preq->url);
1067 }
1068
1069 int finish_http_pack_request(struct http_pack_request *preq)
1070 {
1071 struct packed_git **lst;
1072 struct packed_git *p = preq->target;
1073 char *tmp_idx;
1074 struct child_process ip;
1075 const char *ip_argv[8];
1076
1077 close_pack_index(p);
1078
1079 fclose(preq->packfile);
1080 preq->packfile = NULL;
1081 preq->slot->local = NULL;
1082
1083 lst = preq->lst;
1084 while (*lst != p)
1085 lst = &((*lst)->next);
1086 *lst = (*lst)->next;
1087
1088 tmp_idx = xstrdup(preq->tmpfile);
1089 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1090 ".idx.temp");
1091
1092 ip_argv[0] = "index-pack";
1093 ip_argv[1] = "-o";
1094 ip_argv[2] = tmp_idx;
1095 ip_argv[3] = preq->tmpfile;
1096 ip_argv[4] = NULL;
1097
1098 memset(&ip, 0, sizeof(ip));
1099 ip.argv = ip_argv;
1100 ip.git_cmd = 1;
1101 ip.no_stdin = 1;
1102 ip.no_stdout = 1;
1103
1104 if (run_command(&ip)) {
1105 unlink(preq->tmpfile);
1106 unlink(tmp_idx);
1107 free(tmp_idx);
1108 return -1;
1109 }
1110
1111 unlink(sha1_pack_index_name(p->sha1));
1112
1113 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1114 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1115 free(tmp_idx);
1116 return -1;
1117 }
1118
1119 install_packed_git(p);
1120 free(tmp_idx);
1121 return 0;
1122 }
1123
1124 struct http_pack_request *new_http_pack_request(
1125 struct packed_git *target, const char *base_url)
1126 {
1127 long prev_posn = 0;
1128 char range[RANGE_HEADER_SIZE];
1129 struct strbuf buf = STRBUF_INIT;
1130 struct http_pack_request *preq;
1131
1132 preq = xmalloc(sizeof(*preq));
1133 preq->target = target;
1134 preq->range_header = NULL;
1135
1136 end_url_with_slash(&buf, base_url);
1137 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1138 sha1_to_hex(target->sha1));
1139 preq->url = strbuf_detach(&buf, NULL);
1140
1141 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1142 sha1_pack_name(target->sha1));
1143 preq->packfile = fopen(preq->tmpfile, "a");
1144 if (!preq->packfile) {
1145 error("Unable to open local file %s for pack",
1146 preq->tmpfile);
1147 goto abort;
1148 }
1149
1150 preq->slot = get_active_slot();
1151 preq->slot->local = preq->packfile;
1152 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1153 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1154 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1155 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1156 no_pragma_header);
1157
1158 /*
1159 * If there is data present from a previous transfer attempt,
1160 * resume where it left off
1161 */
1162 prev_posn = ftell(preq->packfile);
1163 if (prev_posn>0) {
1164 if (http_is_verbose)
1165 fprintf(stderr,
1166 "Resuming fetch of pack %s at byte %ld\n",
1167 sha1_to_hex(target->sha1), prev_posn);
1168 sprintf(range, "Range: bytes=%ld-", prev_posn);
1169 preq->range_header = curl_slist_append(NULL, range);
1170 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1171 preq->range_header);
1172 }
1173
1174 return preq;
1175
1176 abort:
1177 free(preq->url);
1178 free(preq);
1179 return NULL;
1180 }
1181
1182 /* Helpers for fetching objects (loose) */
1183 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1184 void *data)
1185 {
1186 unsigned char expn[4096];
1187 size_t size = eltsize * nmemb;
1188 int posn = 0;
1189 struct http_object_request *freq =
1190 (struct http_object_request *)data;
1191 do {
1192 ssize_t retval = xwrite(freq->localfile,
1193 (char *) ptr + posn, size - posn);
1194 if (retval < 0)
1195 return posn;
1196 posn += retval;
1197 } while (posn < size);
1198
1199 freq->stream.avail_in = size;
1200 freq->stream.next_in = (void *)ptr;
1201 do {
1202 freq->stream.next_out = expn;
1203 freq->stream.avail_out = sizeof(expn);
1204 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1205 git_SHA1_Update(&freq->c, expn,
1206 sizeof(expn) - freq->stream.avail_out);
1207 } while (freq->stream.avail_in && freq->zret == Z_OK);
1208 data_received++;
1209 return size;
1210 }
1211
1212 struct http_object_request *new_http_object_request(const char *base_url,
1213 unsigned char *sha1)
1214 {
1215 char *hex = sha1_to_hex(sha1);
1216 char *filename;
1217 char prevfile[PATH_MAX];
1218 int prevlocal;
1219 char prev_buf[PREV_BUF_SIZE];
1220 ssize_t prev_read = 0;
1221 long prev_posn = 0;
1222 char range[RANGE_HEADER_SIZE];
1223 struct curl_slist *range_header = NULL;
1224 struct http_object_request *freq;
1225
1226 freq = xmalloc(sizeof(*freq));
1227 hashcpy(freq->sha1, sha1);
1228 freq->localfile = -1;
1229
1230 filename = sha1_file_name(sha1);
1231 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1232 "%s.temp", filename);
1233
1234 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1235 unlink_or_warn(prevfile);
1236 rename(freq->tmpfile, prevfile);
1237 unlink_or_warn(freq->tmpfile);
1238
1239 if (freq->localfile != -1)
1240 error("fd leakage in start: %d", freq->localfile);
1241 freq->localfile = open(freq->tmpfile,
1242 O_WRONLY | O_CREAT | O_EXCL, 0666);
1243 /*
1244 * This could have failed due to the "lazy directory creation";
1245 * try to mkdir the last path component.
1246 */
1247 if (freq->localfile < 0 && errno == ENOENT) {
1248 char *dir = strrchr(freq->tmpfile, '/');
1249 if (dir) {
1250 *dir = 0;
1251 mkdir(freq->tmpfile, 0777);
1252 *dir = '/';
1253 }
1254 freq->localfile = open(freq->tmpfile,
1255 O_WRONLY | O_CREAT | O_EXCL, 0666);
1256 }
1257
1258 if (freq->localfile < 0) {
1259 error("Couldn't create temporary file %s: %s",
1260 freq->tmpfile, strerror(errno));
1261 goto abort;
1262 }
1263
1264 memset(&freq->stream, 0, sizeof(freq->stream));
1265
1266 git_inflate_init(&freq->stream);
1267
1268 git_SHA1_Init(&freq->c);
1269
1270 freq->url = get_remote_object_url(base_url, hex, 0);
1271
1272 /*
1273 * If a previous temp file is present, process what was already
1274 * fetched.
1275 */
1276 prevlocal = open(prevfile, O_RDONLY);
1277 if (prevlocal != -1) {
1278 do {
1279 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1280 if (prev_read>0) {
1281 if (fwrite_sha1_file(prev_buf,
1282 1,
1283 prev_read,
1284 freq) == prev_read) {
1285 prev_posn += prev_read;
1286 } else {
1287 prev_read = -1;
1288 }
1289 }
1290 } while (prev_read > 0);
1291 close(prevlocal);
1292 }
1293 unlink_or_warn(prevfile);
1294
1295 /*
1296 * Reset inflate/SHA1 if there was an error reading the previous temp
1297 * file; also rewind to the beginning of the local file.
1298 */
1299 if (prev_read == -1) {
1300 memset(&freq->stream, 0, sizeof(freq->stream));
1301 git_inflate_init(&freq->stream);
1302 git_SHA1_Init(&freq->c);
1303 if (prev_posn>0) {
1304 prev_posn = 0;
1305 lseek(freq->localfile, 0, SEEK_SET);
1306 if (ftruncate(freq->localfile, 0) < 0) {
1307 error("Couldn't truncate temporary file %s: %s",
1308 freq->tmpfile, strerror(errno));
1309 goto abort;
1310 }
1311 }
1312 }
1313
1314 freq->slot = get_active_slot();
1315
1316 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1317 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1318 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1319 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1320 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1321
1322 /*
1323 * If we have successfully processed data from a previous fetch
1324 * attempt, only fetch the data we don't already have.
1325 */
1326 if (prev_posn>0) {
1327 if (http_is_verbose)
1328 fprintf(stderr,
1329 "Resuming fetch of object %s at byte %ld\n",
1330 hex, prev_posn);
1331 sprintf(range, "Range: bytes=%ld-", prev_posn);
1332 range_header = curl_slist_append(range_header, range);
1333 curl_easy_setopt(freq->slot->curl,
1334 CURLOPT_HTTPHEADER, range_header);
1335 }
1336
1337 return freq;
1338
1339 abort:
1340 free(filename);
1341 free(freq->url);
1342 free(freq);
1343 return NULL;
1344 }
1345
1346 void process_http_object_request(struct http_object_request *freq)
1347 {
1348 if (freq->slot == NULL)
1349 return;
1350 freq->curl_result = freq->slot->curl_result;
1351 freq->http_code = freq->slot->http_code;
1352 freq->slot = NULL;
1353 }
1354
1355 int finish_http_object_request(struct http_object_request *freq)
1356 {
1357 struct stat st;
1358
1359 close(freq->localfile);
1360 freq->localfile = -1;
1361
1362 process_http_object_request(freq);
1363
1364 if (freq->http_code == 416) {
1365 warning("requested range invalid; we may already have all the data.");
1366 } else if (freq->curl_result != CURLE_OK) {
1367 if (stat(freq->tmpfile, &st) == 0)
1368 if (st.st_size == 0)
1369 unlink_or_warn(freq->tmpfile);
1370 return -1;
1371 }
1372
1373 git_inflate_end(&freq->stream);
1374 git_SHA1_Final(freq->real_sha1, &freq->c);
1375 if (freq->zret != Z_STREAM_END) {
1376 unlink_or_warn(freq->tmpfile);
1377 return -1;
1378 }
1379 if (hashcmp(freq->sha1, freq->real_sha1)) {
1380 unlink_or_warn(freq->tmpfile);
1381 return -1;
1382 }
1383 freq->rename =
1384 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1385
1386 return freq->rename;
1387 }
1388
1389 void abort_http_object_request(struct http_object_request *freq)
1390 {
1391 unlink_or_warn(freq->tmpfile);
1392
1393 release_http_object_request(freq);
1394 }
1395
1396 void release_http_object_request(struct http_object_request *freq)
1397 {
1398 if (freq->localfile != -1) {
1399 close(freq->localfile);
1400 freq->localfile = -1;
1401 }
1402 if (freq->url != NULL) {
1403 free(freq->url);
1404 freq->url = NULL;
1405 }
1406 if (freq->slot != NULL) {
1407 freq->slot->callback_func = NULL;
1408 freq->slot->callback_data = NULL;
1409 release_active_slot(freq->slot);
1410 freq->slot = NULL;
1411 }
1412 }
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