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update $GIT_INDEX_FILE when there are racily clean entries
[git.git] / http.c
blob0a5011f615bdfade0b69682b177dc97471ac20a3
1 #include "http.h"
2 #include "pack.h"
3 #include "sideband.h"
4 #include "run-command.h"
5
6 int data_received;
7 int active_requests;
8 int http_is_verbose;
9 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
10
11 #if LIBCURL_VERSION_NUM >= 0x070a06
12 #define LIBCURL_CAN_HANDLE_AUTH_ANY
13 #endif
14
15 static int min_curl_sessions = 1;
16 static int curl_session_count;
17 #ifdef USE_CURL_MULTI
18 static int max_requests = -1;
19 static CURLM *curlm;
20 #endif
21 #ifndef NO_CURL_EASY_DUPHANDLE
22 static CURL *curl_default;
23 #endif
24
25 #define PREV_BUF_SIZE 4096
26 #define RANGE_HEADER_SIZE 30
27
28 char curl_errorstr[CURL_ERROR_SIZE];
29
30 static int curl_ssl_verify = -1;
31 static const char *ssl_cert;
32 #if LIBCURL_VERSION_NUM >= 0x070903
33 static const char *ssl_key;
34 #endif
35 #if LIBCURL_VERSION_NUM >= 0x070908
36 static const char *ssl_capath;
37 #endif
38 static const char *ssl_cainfo;
39 static long curl_low_speed_limit = -1;
40 static long curl_low_speed_time = -1;
41 static int curl_ftp_no_epsv;
42 static const char *curl_http_proxy;
43 static char *user_name, *user_pass;
44 static const char *user_agent;
45
46 #if LIBCURL_VERSION_NUM >= 0x071700
47 /* Use CURLOPT_KEYPASSWD as is */
48 #elif LIBCURL_VERSION_NUM >= 0x070903
49 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
50 #else
51 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
52 #endif
53
54 static char *ssl_cert_password;
55 static int ssl_cert_password_required;
56
57 static struct curl_slist *pragma_header;
58 static struct curl_slist *no_pragma_header;
59
60 static struct active_request_slot *active_queue_head;
61
62 size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
63 {
64 size_t size = eltsize * nmemb;
65 struct buffer *buffer = buffer_;
66
67 if (size > buffer->buf.len - buffer->posn)
68 size = buffer->buf.len - buffer->posn;
69 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
70 buffer->posn += size;
71
72 return size;
73 }
74
75 #ifndef NO_CURL_IOCTL
76 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
77 {
78 struct buffer *buffer = clientp;
79
80 switch (cmd) {
81 case CURLIOCMD_NOP:
82 return CURLIOE_OK;
83
84 case CURLIOCMD_RESTARTREAD:
85 buffer->posn = 0;
86 return CURLIOE_OK;
87
88 default:
89 return CURLIOE_UNKNOWNCMD;
90 }
91 }
92 #endif
93
94 size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
95 {
96 size_t size = eltsize * nmemb;
97 struct strbuf *buffer = buffer_;
98
99 strbuf_add(buffer, ptr, size);
100 data_received++;
101 return size;
102 }
103
104 size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
105 {
106 data_received++;
107 return eltsize * nmemb;
108 }
109
110 #ifdef USE_CURL_MULTI
111 static void process_curl_messages(void)
112 {
113 int num_messages;
114 struct active_request_slot *slot;
115 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
116
117 while (curl_message != NULL) {
118 if (curl_message->msg == CURLMSG_DONE) {
119 int curl_result = curl_message->data.result;
120 slot = active_queue_head;
121 while (slot != NULL &&
122 slot->curl != curl_message->easy_handle)
123 slot = slot->next;
124 if (slot != NULL) {
125 curl_multi_remove_handle(curlm, slot->curl);
126 slot->curl_result = curl_result;
127 finish_active_slot(slot);
128 } else {
129 fprintf(stderr, "Received DONE message for unknown request!\n");
130 }
131 } else {
132 fprintf(stderr, "Unknown CURL message received: %d\n",
133 (int)curl_message->msg);
134 }
135 curl_message = curl_multi_info_read(curlm, &num_messages);
136 }
137 }
138 #endif
139
140 static int http_options(const char *var, const char *value, void *cb)
141 {
142 if (!strcmp("http.sslverify", var)) {
143 curl_ssl_verify = git_config_bool(var, value);
144 return 0;
145 }
146 if (!strcmp("http.sslcert", var))
147 return git_config_string(&ssl_cert, var, value);
148 #if LIBCURL_VERSION_NUM >= 0x070903
149 if (!strcmp("http.sslkey", var))
150 return git_config_string(&ssl_key, var, value);
151 #endif
152 #if LIBCURL_VERSION_NUM >= 0x070908
153 if (!strcmp("http.sslcapath", var))
154 return git_config_string(&ssl_capath, var, value);
155 #endif
156 if (!strcmp("http.sslcainfo", var))
157 return git_config_string(&ssl_cainfo, var, value);
158 if (!strcmp("http.sslcertpasswordprotected", var)) {
159 if (git_config_bool(var, value))
160 ssl_cert_password_required = 1;
161 return 0;
162 }
163 if (!strcmp("http.minsessions", var)) {
164 min_curl_sessions = git_config_int(var, value);
165 #ifndef USE_CURL_MULTI
166 if (min_curl_sessions > 1)
167 min_curl_sessions = 1;
168 #endif
169 return 0;
170 }
171 #ifdef USE_CURL_MULTI
172 if (!strcmp("http.maxrequests", var)) {
173 max_requests = git_config_int(var, value);
174 return 0;
175 }
176 #endif
177 if (!strcmp("http.lowspeedlimit", var)) {
178 curl_low_speed_limit = (long)git_config_int(var, value);
179 return 0;
180 }
181 if (!strcmp("http.lowspeedtime", var)) {
182 curl_low_speed_time = (long)git_config_int(var, value);
183 return 0;
184 }
185
186 if (!strcmp("http.noepsv", var)) {
187 curl_ftp_no_epsv = git_config_bool(var, value);
188 return 0;
189 }
190 if (!strcmp("http.proxy", var))
191 return git_config_string(&curl_http_proxy, var, value);
192
193 if (!strcmp("http.postbuffer", var)) {
194 http_post_buffer = git_config_int(var, value);
195 if (http_post_buffer < LARGE_PACKET_MAX)
196 http_post_buffer = LARGE_PACKET_MAX;
197 return 0;
198 }
199
200 if (!strcmp("http.useragent", var))
201 return git_config_string(&user_agent, var, value);
202
203 /* Fall back on the default ones */
204 return git_default_config(var, value, cb);
205 }
206
207 static void init_curl_http_auth(CURL *result)
208 {
209 if (user_name) {
210 struct strbuf up = STRBUF_INIT;
211 if (!user_pass)
212 user_pass = xstrdup(git_getpass("Password: "));
213 strbuf_addf(&up, "%s:%s", user_name, user_pass);
214 curl_easy_setopt(result, CURLOPT_USERPWD,
215 strbuf_detach(&up, NULL));
216 }
217 }
218
219 static int has_cert_password(void)
220 {
221 if (ssl_cert_password != NULL)
222 return 1;
223 if (ssl_cert == NULL || ssl_cert_password_required != 1)
224 return 0;
225 /* Only prompt the user once. */
226 ssl_cert_password_required = -1;
227 ssl_cert_password = git_getpass("Certificate Password: ");
228 if (ssl_cert_password != NULL) {
229 ssl_cert_password = xstrdup(ssl_cert_password);
230 return 1;
231 } else
232 return 0;
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 init_curl_http_auth(result);
257
258 if (ssl_cert != NULL)
259 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
260 if (has_cert_password())
261 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
262 #if LIBCURL_VERSION_NUM >= 0x070903
263 if (ssl_key != NULL)
264 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
265 #endif
266 #if LIBCURL_VERSION_NUM >= 0x070908
267 if (ssl_capath != NULL)
268 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
269 #endif
270 if (ssl_cainfo != NULL)
271 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
272 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
273
274 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
275 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
276 curl_low_speed_limit);
277 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
278 curl_low_speed_time);
279 }
280
281 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
282
283 if (getenv("GIT_CURL_VERBOSE"))
284 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
285
286 curl_easy_setopt(result, CURLOPT_USERAGENT,
287 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
288
289 if (curl_ftp_no_epsv)
290 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
291
292 if (curl_http_proxy)
293 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
294
295 return result;
296 }
297
298 static void http_auth_init(const char *url)
299 {
300 char *at, *colon, *cp, *slash;
301 int len;
302
303 cp = strstr(url, "://");
304 if (!cp)
305 return;
306
307 /*
308 * Ok, the URL looks like "proto://something". Which one?
309 * "proto://<user>:<pass>@<host>/...",
310 * "proto://<user>@<host>/...", or just
311 * "proto://<host>/..."?
312 */
313 cp += 3;
314 at = strchr(cp, '@');
315 colon = strchr(cp, ':');
316 slash = strchrnul(cp, '/');
317 if (!at || slash <= at)
318 return; /* No credentials */
319 if (!colon || at <= colon) {
320 /* Only username */
321 len = at - cp;
322 user_name = xmalloc(len + 1);
323 memcpy(user_name, cp, len);
324 user_name[len] = '\0';
325 user_pass = NULL;
326 } else {
327 len = colon - cp;
328 user_name = xmalloc(len + 1);
329 memcpy(user_name, cp, len);
330 user_name[len] = '\0';
331 len = at - (colon + 1);
332 user_pass = xmalloc(len + 1);
333 memcpy(user_pass, colon + 1, len);
334 user_pass[len] = '\0';
335 }
336 }
337
338 static void set_from_env(const char **var, const char *envname)
339 {
340 const char *val = getenv(envname);
341 if (val)
342 *var = val;
343 }
344
345 void http_init(struct remote *remote)
346 {
347 char *low_speed_limit;
348 char *low_speed_time;
349
350 http_is_verbose = 0;
351
352 git_config(http_options, NULL);
353
354 curl_global_init(CURL_GLOBAL_ALL);
355
356 if (remote && remote->http_proxy)
357 curl_http_proxy = xstrdup(remote->http_proxy);
358
359 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
360 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
361
362 #ifdef USE_CURL_MULTI
363 {
364 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
365 if (http_max_requests != NULL)
366 max_requests = atoi(http_max_requests);
367 }
368
369 curlm = curl_multi_init();
370 if (curlm == NULL) {
371 fprintf(stderr, "Error creating curl multi handle.\n");
372 exit(1);
373 }
374 #endif
375
376 if (getenv("GIT_SSL_NO_VERIFY"))
377 curl_ssl_verify = 0;
378
379 set_from_env(&ssl_cert, "GIT_SSL_CERT");
380 #if LIBCURL_VERSION_NUM >= 0x070903
381 set_from_env(&ssl_key, "GIT_SSL_KEY");
382 #endif
383 #if LIBCURL_VERSION_NUM >= 0x070908
384 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
385 #endif
386 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
387
388 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
389
390 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
391 if (low_speed_limit != NULL)
392 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
393 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
394 if (low_speed_time != NULL)
395 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
396
397 if (curl_ssl_verify == -1)
398 curl_ssl_verify = 1;
399
400 curl_session_count = 0;
401 #ifdef USE_CURL_MULTI
402 if (max_requests < 1)
403 max_requests = DEFAULT_MAX_REQUESTS;
404 #endif
405
406 if (getenv("GIT_CURL_FTP_NO_EPSV"))
407 curl_ftp_no_epsv = 1;
408
409 if (remote && remote->url && remote->url[0]) {
410 http_auth_init(remote->url[0]);
411 if (!ssl_cert_password_required &&
412 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
413 !prefixcmp(remote->url[0], "https://"))
414 ssl_cert_password_required = 1;
415 }
416
417 #ifndef NO_CURL_EASY_DUPHANDLE
418 curl_default = get_curl_handle();
419 #endif
420 }
421
422 void http_cleanup(void)
423 {
424 struct active_request_slot *slot = active_queue_head;
425
426 while (slot != NULL) {
427 struct active_request_slot *next = slot->next;
428 if (slot->curl != NULL) {
429 #ifdef USE_CURL_MULTI
430 curl_multi_remove_handle(curlm, slot->curl);
431 #endif
432 curl_easy_cleanup(slot->curl);
433 }
434 free(slot);
435 slot = next;
436 }
437 active_queue_head = NULL;
438
439 #ifndef NO_CURL_EASY_DUPHANDLE
440 curl_easy_cleanup(curl_default);
441 #endif
442
443 #ifdef USE_CURL_MULTI
444 curl_multi_cleanup(curlm);
445 #endif
446 curl_global_cleanup();
447
448 curl_slist_free_all(pragma_header);
449 pragma_header = NULL;
450
451 curl_slist_free_all(no_pragma_header);
452 no_pragma_header = NULL;
453
454 if (curl_http_proxy) {
455 free((void *)curl_http_proxy);
456 curl_http_proxy = NULL;
457 }
458
459 if (ssl_cert_password != NULL) {
460 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
461 free(ssl_cert_password);
462 ssl_cert_password = NULL;
463 }
464 ssl_cert_password_required = 0;
465 }
466
467 struct active_request_slot *get_active_slot(void)
468 {
469 struct active_request_slot *slot = active_queue_head;
470 struct active_request_slot *newslot;
471
472 #ifdef USE_CURL_MULTI
473 int num_transfers;
474
475 /* Wait for a slot to open up if the queue is full */
476 while (active_requests >= max_requests) {
477 curl_multi_perform(curlm, &num_transfers);
478 if (num_transfers < active_requests)
479 process_curl_messages();
480 }
481 #endif
482
483 while (slot != NULL && slot->in_use)
484 slot = slot->next;
485
486 if (slot == NULL) {
487 newslot = xmalloc(sizeof(*newslot));
488 newslot->curl = NULL;
489 newslot->in_use = 0;
490 newslot->next = NULL;
491
492 slot = active_queue_head;
493 if (slot == NULL) {
494 active_queue_head = newslot;
495 } else {
496 while (slot->next != NULL)
497 slot = slot->next;
498 slot->next = newslot;
499 }
500 slot = newslot;
501 }
502
503 if (slot->curl == NULL) {
504 #ifdef NO_CURL_EASY_DUPHANDLE
505 slot->curl = get_curl_handle();
506 #else
507 slot->curl = curl_easy_duphandle(curl_default);
508 #endif
509 curl_session_count++;
510 }
511
512 active_requests++;
513 slot->in_use = 1;
514 slot->local = NULL;
515 slot->results = NULL;
516 slot->finished = NULL;
517 slot->callback_data = NULL;
518 slot->callback_func = NULL;
519 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
520 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
521 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
522 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
523 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
524 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
525 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
526
527 return slot;
528 }
529
530 int start_active_slot(struct active_request_slot *slot)
531 {
532 #ifdef USE_CURL_MULTI
533 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
534 int num_transfers;
535
536 if (curlm_result != CURLM_OK &&
537 curlm_result != CURLM_CALL_MULTI_PERFORM) {
538 active_requests--;
539 slot->in_use = 0;
540 return 0;
541 }
542
543 /*
544 * We know there must be something to do, since we just added
545 * something.
546 */
547 curl_multi_perform(curlm, &num_transfers);
548 #endif
549 return 1;
550 }
551
552 #ifdef USE_CURL_MULTI
553 struct fill_chain {
554 void *data;
555 int (*fill)(void *);
556 struct fill_chain *next;
557 };
558
559 static struct fill_chain *fill_cfg;
560
561 void add_fill_function(void *data, int (*fill)(void *))
562 {
563 struct fill_chain *new = xmalloc(sizeof(*new));
564 struct fill_chain **linkp = &fill_cfg;
565 new->data = data;
566 new->fill = fill;
567 new->next = NULL;
568 while (*linkp)
569 linkp = &(*linkp)->next;
570 *linkp = new;
571 }
572
573 void fill_active_slots(void)
574 {
575 struct active_request_slot *slot = active_queue_head;
576
577 while (active_requests < max_requests) {
578 struct fill_chain *fill;
579 for (fill = fill_cfg; fill; fill = fill->next)
580 if (fill->fill(fill->data))
581 break;
582
583 if (!fill)
584 break;
585 }
586
587 while (slot != NULL) {
588 if (!slot->in_use && slot->curl != NULL
589 && curl_session_count > min_curl_sessions) {
590 curl_easy_cleanup(slot->curl);
591 slot->curl = NULL;
592 curl_session_count--;
593 }
594 slot = slot->next;
595 }
596 }
597
598 void step_active_slots(void)
599 {
600 int num_transfers;
601 CURLMcode curlm_result;
602
603 do {
604 curlm_result = curl_multi_perform(curlm, &num_transfers);
605 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
606 if (num_transfers < active_requests) {
607 process_curl_messages();
608 fill_active_slots();
609 }
610 }
611 #endif
612
613 void run_active_slot(struct active_request_slot *slot)
614 {
615 #ifdef USE_CURL_MULTI
616 long last_pos = 0;
617 long current_pos;
618 fd_set readfds;
619 fd_set writefds;
620 fd_set excfds;
621 int max_fd;
622 struct timeval select_timeout;
623 int finished = 0;
624
625 slot->finished = &finished;
626 while (!finished) {
627 data_received = 0;
628 step_active_slots();
629
630 if (!data_received && slot->local != NULL) {
631 current_pos = ftell(slot->local);
632 if (current_pos > last_pos)
633 data_received++;
634 last_pos = current_pos;
635 }
636
637 if (slot->in_use && !data_received) {
638 max_fd = 0;
639 FD_ZERO(&readfds);
640 FD_ZERO(&writefds);
641 FD_ZERO(&excfds);
642 select_timeout.tv_sec = 0;
643 select_timeout.tv_usec = 50000;
644 select(max_fd, &readfds, &writefds,
645 &excfds, &select_timeout);
646 }
647 }
648 #else
649 while (slot->in_use) {
650 slot->curl_result = curl_easy_perform(slot->curl);
651 finish_active_slot(slot);
652 }
653 #endif
654 }
655
656 static void closedown_active_slot(struct active_request_slot *slot)
657 {
658 active_requests--;
659 slot->in_use = 0;
660 }
661
662 static void release_active_slot(struct active_request_slot *slot)
663 {
664 closedown_active_slot(slot);
665 if (slot->curl && curl_session_count > min_curl_sessions) {
666 #ifdef USE_CURL_MULTI
667 curl_multi_remove_handle(curlm, slot->curl);
668 #endif
669 curl_easy_cleanup(slot->curl);
670 slot->curl = NULL;
671 curl_session_count--;
672 }
673 #ifdef USE_CURL_MULTI
674 fill_active_slots();
675 #endif
676 }
677
678 void finish_active_slot(struct active_request_slot *slot)
679 {
680 closedown_active_slot(slot);
681 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
682
683 if (slot->finished != NULL)
684 (*slot->finished) = 1;
685
686 /* Store slot results so they can be read after the slot is reused */
687 if (slot->results != NULL) {
688 slot->results->curl_result = slot->curl_result;
689 slot->results->http_code = slot->http_code;
690 }
691
692 /* Run callback if appropriate */
693 if (slot->callback_func != NULL)
694 slot->callback_func(slot->callback_data);
695 }
696
697 void finish_all_active_slots(void)
698 {
699 struct active_request_slot *slot = active_queue_head;
700
701 while (slot != NULL)
702 if (slot->in_use) {
703 run_active_slot(slot);
704 slot = active_queue_head;
705 } else {
706 slot = slot->next;
707 }
708 }
709
710 /* Helpers for modifying and creating URLs */
711 static inline int needs_quote(int ch)
712 {
713 if (((ch >= 'A') && (ch <= 'Z'))
714 || ((ch >= 'a') && (ch <= 'z'))
715 || ((ch >= '0') && (ch <= '9'))
716 || (ch == '/')
717 || (ch == '-')
718 || (ch == '.'))
719 return 0;
720 return 1;
721 }
722
723 static inline int hex(int v)
724 {
725 if (v < 10)
726 return '0' + v;
727 else
728 return 'A' + v - 10;
729 }
730
731 void end_url_with_slash(struct strbuf *buf, const char *url)
732 {
733 strbuf_addstr(buf, url);
734 if (buf->len && buf->buf[buf->len - 1] != '/')
735 strbuf_addstr(buf, "/");
736 }
737
738 static char *quote_ref_url(const char *base, const char *ref)
739 {
740 struct strbuf buf = STRBUF_INIT;
741 const char *cp;
742 int ch;
743
744 end_url_with_slash(&buf, base);
745
746 for (cp = ref; (ch = *cp) != 0; cp++)
747 if (needs_quote(ch))
748 strbuf_addf(&buf, "%%%02x", ch);
749 else
750 strbuf_addch(&buf, *cp);
751
752 return strbuf_detach(&buf, NULL);
753 }
754
755 void append_remote_object_url(struct strbuf *buf, const char *url,
756 const char *hex,
757 int only_two_digit_prefix)
758 {
759 end_url_with_slash(buf, url);
760
761 strbuf_addf(buf, "objects/%.*s/", 2, hex);
762 if (!only_two_digit_prefix)
763 strbuf_addf(buf, "%s", hex+2);
764 }
765
766 char *get_remote_object_url(const char *url, const char *hex,
767 int only_two_digit_prefix)
768 {
769 struct strbuf buf = STRBUF_INIT;
770 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
771 return strbuf_detach(&buf, NULL);
772 }
773
774 /* http_request() targets */
775 #define HTTP_REQUEST_STRBUF 0
776 #define HTTP_REQUEST_FILE 1
777
778 static int http_request(const char *url, void *result, int target, int options)
779 {
780 struct active_request_slot *slot;
781 struct slot_results results;
782 struct curl_slist *headers = NULL;
783 struct strbuf buf = STRBUF_INIT;
784 int ret;
785
786 slot = get_active_slot();
787 slot->results = &results;
788 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
789
790 if (result == NULL) {
791 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
792 } else {
793 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
794 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
795
796 if (target == HTTP_REQUEST_FILE) {
797 long posn = ftell(result);
798 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
799 fwrite);
800 if (posn > 0) {
801 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
802 headers = curl_slist_append(headers, buf.buf);
803 strbuf_reset(&buf);
804 }
805 slot->local = result;
806 } else
807 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
808 fwrite_buffer);
809 }
810
811 strbuf_addstr(&buf, "Pragma:");
812 if (options & HTTP_NO_CACHE)
813 strbuf_addstr(&buf, " no-cache");
814
815 headers = curl_slist_append(headers, buf.buf);
816
817 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
818 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
819
820 if (start_active_slot(slot)) {
821 run_active_slot(slot);
822 if (results.curl_result == CURLE_OK)
823 ret = HTTP_OK;
824 else if (missing_target(&results))
825 ret = HTTP_MISSING_TARGET;
826 else if (results.http_code == 401) {
827 if (user_name) {
828 ret = HTTP_NOAUTH;
829 } else {
830 /*
831 * git_getpass is needed here because its very likely stdin/stdout are
832 * pipes to our parent process. So we instead need to use /dev/tty,
833 * but that is non-portable. Using git_getpass() can at least be stubbed
834 * on other platforms with a different implementation if/when necessary.
835 */
836 user_name = xstrdup(git_getpass("Username: "));
837 init_curl_http_auth(slot->curl);
838 ret = HTTP_REAUTH;
839 }
840 } else
841 ret = HTTP_ERROR;
842 } else {
843 error("Unable to start HTTP request for %s", url);
844 ret = HTTP_START_FAILED;
845 }
846
847 slot->local = NULL;
848 curl_slist_free_all(headers);
849 strbuf_release(&buf);
850
851 return ret;
852 }
853
854 int http_get_strbuf(const char *url, struct strbuf *result, int options)
855 {
856 int http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
857 if (http_ret == HTTP_REAUTH) {
858 http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
859 }
860 return http_ret;
861 }
862
863 /*
864 * Downloads an url and stores the result in the given file.
865 *
866 * If a previous interrupted download is detected (i.e. a previous temporary
867 * file is still around) the download is resumed.
868 */
869 static int http_get_file(const char *url, const char *filename, int options)
870 {
871 int ret;
872 struct strbuf tmpfile = STRBUF_INIT;
873 FILE *result;
874
875 strbuf_addf(&tmpfile, "%s.temp", filename);
876 result = fopen(tmpfile.buf, "a");
877 if (! result) {
878 error("Unable to open local file %s", tmpfile.buf);
879 ret = HTTP_ERROR;
880 goto cleanup;
881 }
882
883 ret = http_request(url, result, HTTP_REQUEST_FILE, options);
884 fclose(result);
885
886 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
887 ret = HTTP_ERROR;
888 cleanup:
889 strbuf_release(&tmpfile);
890 return ret;
891 }
892
893 int http_error(const char *url, int ret)
894 {
895 /* http_request has already handled HTTP_START_FAILED. */
896 if (ret != HTTP_START_FAILED)
897 error("%s while accessing %s\n", curl_errorstr, url);
898
899 return ret;
900 }
901
902 int http_fetch_ref(const char *base, struct ref *ref)
903 {
904 char *url;
905 struct strbuf buffer = STRBUF_INIT;
906 int ret = -1;
907
908 url = quote_ref_url(base, ref->name);
909 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
910 strbuf_rtrim(&buffer);
911 if (buffer.len == 40)
912 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
913 else if (!prefixcmp(buffer.buf, "ref: ")) {
914 ref->symref = xstrdup(buffer.buf + 5);
915 ret = 0;
916 }
917 }
918
919 strbuf_release(&buffer);
920 free(url);
921 return ret;
922 }
923
924 /* Helpers for fetching packs */
925 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
926 {
927 char *url, *tmp;
928 struct strbuf buf = STRBUF_INIT;
929
930 if (http_is_verbose)
931 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
932
933 end_url_with_slash(&buf, base_url);
934 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
935 url = strbuf_detach(&buf, NULL);
936
937 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
938 tmp = strbuf_detach(&buf, NULL);
939
940 if (http_get_file(url, tmp, 0) != HTTP_OK) {
941 error("Unable to get pack index %s\n", url);
942 free(tmp);
943 tmp = NULL;
944 }
945
946 free(url);
947 return tmp;
948 }
949
950 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
951 unsigned char *sha1, const char *base_url)
952 {
953 struct packed_git *new_pack;
954 char *tmp_idx = NULL;
955 int ret;
956
957 if (has_pack_index(sha1)) {
958 new_pack = parse_pack_index(sha1, NULL);
959 if (!new_pack)
960 return -1; /* parse_pack_index() already issued error message */
961 goto add_pack;
962 }
963
964 tmp_idx = fetch_pack_index(sha1, base_url);
965 if (!tmp_idx)
966 return -1;
967
968 new_pack = parse_pack_index(sha1, tmp_idx);
969 if (!new_pack) {
970 unlink(tmp_idx);
971 free(tmp_idx);
972
973 return -1; /* parse_pack_index() already issued error message */
974 }
975
976 ret = verify_pack_index(new_pack);
977 if (!ret) {
978 close_pack_index(new_pack);
979 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
980 }
981 free(tmp_idx);
982 if (ret)
983 return -1;
984
985 add_pack:
986 new_pack->next = *packs_head;
987 *packs_head = new_pack;
988 return 0;
989 }
990
991 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
992 {
993 int ret = 0, i = 0;
994 char *url, *data;
995 struct strbuf buf = STRBUF_INIT;
996 unsigned char sha1[20];
997
998 end_url_with_slash(&buf, base_url);
999 strbuf_addstr(&buf, "objects/info/packs");
1000 url = strbuf_detach(&buf, NULL);
1001
1002 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1003 if (ret != HTTP_OK)
1004 goto cleanup;
1005
1006 data = buf.buf;
1007 while (i < buf.len) {
1008 switch (data[i]) {
1009 case 'P':
1010 i++;
1011 if (i + 52 <= buf.len &&
1012 !prefixcmp(data + i, " pack-") &&
1013 !prefixcmp(data + i + 46, ".pack\n")) {
1014 get_sha1_hex(data + i + 6, sha1);
1015 fetch_and_setup_pack_index(packs_head, sha1,
1016 base_url);
1017 i += 51;
1018 break;
1019 }
1020 default:
1021 while (i < buf.len && data[i] != '\n')
1022 i++;
1023 }
1024 i++;
1025 }
1026
1027 cleanup:
1028 free(url);
1029 return ret;
1030 }
1031
1032 void release_http_pack_request(struct http_pack_request *preq)
1033 {
1034 if (preq->packfile != NULL) {
1035 fclose(preq->packfile);
1036 preq->packfile = NULL;
1037 preq->slot->local = NULL;
1038 }
1039 if (preq->range_header != NULL) {
1040 curl_slist_free_all(preq->range_header);
1041 preq->range_header = NULL;
1042 }
1043 preq->slot = NULL;
1044 free(preq->url);
1045 }
1046
1047 int finish_http_pack_request(struct http_pack_request *preq)
1048 {
1049 struct packed_git **lst;
1050 struct packed_git *p = preq->target;
1051 char *tmp_idx;
1052 struct child_process ip;
1053 const char *ip_argv[8];
1054
1055 close_pack_index(p);
1056
1057 fclose(preq->packfile);
1058 preq->packfile = NULL;
1059 preq->slot->local = NULL;
1060
1061 lst = preq->lst;
1062 while (*lst != p)
1063 lst = &((*lst)->next);
1064 *lst = (*lst)->next;
1065
1066 tmp_idx = xstrdup(preq->tmpfile);
1067 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1068 ".idx.temp");
1069
1070 ip_argv[0] = "index-pack";
1071 ip_argv[1] = "-o";
1072 ip_argv[2] = tmp_idx;
1073 ip_argv[3] = preq->tmpfile;
1074 ip_argv[4] = NULL;
1075
1076 memset(&ip, 0, sizeof(ip));
1077 ip.argv = ip_argv;
1078 ip.git_cmd = 1;
1079 ip.no_stdin = 1;
1080 ip.no_stdout = 1;
1081
1082 if (run_command(&ip)) {
1083 unlink(preq->tmpfile);
1084 unlink(tmp_idx);
1085 free(tmp_idx);
1086 return -1;
1087 }
1088
1089 unlink(sha1_pack_index_name(p->sha1));
1090
1091 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1092 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1093 free(tmp_idx);
1094 return -1;
1095 }
1096
1097 install_packed_git(p);
1098 free(tmp_idx);
1099 return 0;
1100 }
1101
1102 struct http_pack_request *new_http_pack_request(
1103 struct packed_git *target, const char *base_url)
1104 {
1105 long prev_posn = 0;
1106 char range[RANGE_HEADER_SIZE];
1107 struct strbuf buf = STRBUF_INIT;
1108 struct http_pack_request *preq;
1109
1110 preq = xmalloc(sizeof(*preq));
1111 preq->target = target;
1112 preq->range_header = NULL;
1113
1114 end_url_with_slash(&buf, base_url);
1115 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1116 sha1_to_hex(target->sha1));
1117 preq->url = strbuf_detach(&buf, NULL);
1118
1119 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1120 sha1_pack_name(target->sha1));
1121 preq->packfile = fopen(preq->tmpfile, "a");
1122 if (!preq->packfile) {
1123 error("Unable to open local file %s for pack",
1124 preq->tmpfile);
1125 goto abort;
1126 }
1127
1128 preq->slot = get_active_slot();
1129 preq->slot->local = preq->packfile;
1130 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1131 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1132 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1133 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1134 no_pragma_header);
1135
1136 /*
1137 * If there is data present from a previous transfer attempt,
1138 * resume where it left off
1139 */
1140 prev_posn = ftell(preq->packfile);
1141 if (prev_posn>0) {
1142 if (http_is_verbose)
1143 fprintf(stderr,
1144 "Resuming fetch of pack %s at byte %ld\n",
1145 sha1_to_hex(target->sha1), prev_posn);
1146 sprintf(range, "Range: bytes=%ld-", prev_posn);
1147 preq->range_header = curl_slist_append(NULL, range);
1148 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1149 preq->range_header);
1150 }
1151
1152 return preq;
1153
1154 abort:
1155 free(preq->url);
1156 free(preq);
1157 return NULL;
1158 }
1159
1160 /* Helpers for fetching objects (loose) */
1161 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
1162 void *data)
1163 {
1164 unsigned char expn[4096];
1165 size_t size = eltsize * nmemb;
1166 int posn = 0;
1167 struct http_object_request *freq =
1168 (struct http_object_request *)data;
1169 do {
1170 ssize_t retval = xwrite(freq->localfile,
1171 (char *) ptr + posn, size - posn);
1172 if (retval < 0)
1173 return posn;
1174 posn += retval;
1175 } while (posn < size);
1176
1177 freq->stream.avail_in = size;
1178 freq->stream.next_in = ptr;
1179 do {
1180 freq->stream.next_out = expn;
1181 freq->stream.avail_out = sizeof(expn);
1182 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1183 git_SHA1_Update(&freq->c, expn,
1184 sizeof(expn) - freq->stream.avail_out);
1185 } while (freq->stream.avail_in && freq->zret == Z_OK);
1186 data_received++;
1187 return size;
1188 }
1189
1190 struct http_object_request *new_http_object_request(const char *base_url,
1191 unsigned char *sha1)
1192 {
1193 char *hex = sha1_to_hex(sha1);
1194 char *filename;
1195 char prevfile[PATH_MAX];
1196 int prevlocal;
1197 unsigned char prev_buf[PREV_BUF_SIZE];
1198 ssize_t prev_read = 0;
1199 long prev_posn = 0;
1200 char range[RANGE_HEADER_SIZE];
1201 struct curl_slist *range_header = NULL;
1202 struct http_object_request *freq;
1203
1204 freq = xmalloc(sizeof(*freq));
1205 hashcpy(freq->sha1, sha1);
1206 freq->localfile = -1;
1207
1208 filename = sha1_file_name(sha1);
1209 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1210 "%s.temp", filename);
1211
1212 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1213 unlink_or_warn(prevfile);
1214 rename(freq->tmpfile, prevfile);
1215 unlink_or_warn(freq->tmpfile);
1216
1217 if (freq->localfile != -1)
1218 error("fd leakage in start: %d", freq->localfile);
1219 freq->localfile = open(freq->tmpfile,
1220 O_WRONLY | O_CREAT | O_EXCL, 0666);
1221 /*
1222 * This could have failed due to the "lazy directory creation";
1223 * try to mkdir the last path component.
1224 */
1225 if (freq->localfile < 0 && errno == ENOENT) {
1226 char *dir = strrchr(freq->tmpfile, '/');
1227 if (dir) {
1228 *dir = 0;
1229 mkdir(freq->tmpfile, 0777);
1230 *dir = '/';
1231 }
1232 freq->localfile = open(freq->tmpfile,
1233 O_WRONLY | O_CREAT | O_EXCL, 0666);
1234 }
1235
1236 if (freq->localfile < 0) {
1237 error("Couldn't create temporary file %s: %s",
1238 freq->tmpfile, strerror(errno));
1239 goto abort;
1240 }
1241
1242 memset(&freq->stream, 0, sizeof(freq->stream));
1243
1244 git_inflate_init(&freq->stream);
1245
1246 git_SHA1_Init(&freq->c);
1247
1248 freq->url = get_remote_object_url(base_url, hex, 0);
1249
1250 /*
1251 * If a previous temp file is present, process what was already
1252 * fetched.
1253 */
1254 prevlocal = open(prevfile, O_RDONLY);
1255 if (prevlocal != -1) {
1256 do {
1257 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1258 if (prev_read>0) {
1259 if (fwrite_sha1_file(prev_buf,
1260 1,
1261 prev_read,
1262 freq) == prev_read) {
1263 prev_posn += prev_read;
1264 } else {
1265 prev_read = -1;
1266 }
1267 }
1268 } while (prev_read > 0);
1269 close(prevlocal);
1270 }
1271 unlink_or_warn(prevfile);
1272
1273 /*
1274 * Reset inflate/SHA1 if there was an error reading the previous temp
1275 * file; also rewind to the beginning of the local file.
1276 */
1277 if (prev_read == -1) {
1278 memset(&freq->stream, 0, sizeof(freq->stream));
1279 git_inflate_init(&freq->stream);
1280 git_SHA1_Init(&freq->c);
1281 if (prev_posn>0) {
1282 prev_posn = 0;
1283 lseek(freq->localfile, 0, SEEK_SET);
1284 if (ftruncate(freq->localfile, 0) < 0) {
1285 error("Couldn't truncate temporary file %s: %s",
1286 freq->tmpfile, strerror(errno));
1287 goto abort;
1288 }
1289 }
1290 }
1291
1292 freq->slot = get_active_slot();
1293
1294 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1295 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1296 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1297 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1298 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1299
1300 /*
1301 * If we have successfully processed data from a previous fetch
1302 * attempt, only fetch the data we don't already have.
1303 */
1304 if (prev_posn>0) {
1305 if (http_is_verbose)
1306 fprintf(stderr,
1307 "Resuming fetch of object %s at byte %ld\n",
1308 hex, prev_posn);
1309 sprintf(range, "Range: bytes=%ld-", prev_posn);
1310 range_header = curl_slist_append(range_header, range);
1311 curl_easy_setopt(freq->slot->curl,
1312 CURLOPT_HTTPHEADER, range_header);
1313 }
1314
1315 return freq;
1316
1317 abort:
1318 free(filename);
1319 free(freq->url);
1320 free(freq);
1321 return NULL;
1322 }
1323
1324 void process_http_object_request(struct http_object_request *freq)
1325 {
1326 if (freq->slot == NULL)
1327 return;
1328 freq->curl_result = freq->slot->curl_result;
1329 freq->http_code = freq->slot->http_code;
1330 freq->slot = NULL;
1331 }
1332
1333 int finish_http_object_request(struct http_object_request *freq)
1334 {
1335 struct stat st;
1336
1337 close(freq->localfile);
1338 freq->localfile = -1;
1339
1340 process_http_object_request(freq);
1341
1342 if (freq->http_code == 416) {
1343 warning("requested range invalid; we may already have all the data.");
1344 } else if (freq->curl_result != CURLE_OK) {
1345 if (stat(freq->tmpfile, &st) == 0)
1346 if (st.st_size == 0)
1347 unlink_or_warn(freq->tmpfile);
1348 return -1;
1349 }
1350
1351 git_inflate_end(&freq->stream);
1352 git_SHA1_Final(freq->real_sha1, &freq->c);
1353 if (freq->zret != Z_STREAM_END) {
1354 unlink_or_warn(freq->tmpfile);
1355 return -1;
1356 }
1357 if (hashcmp(freq->sha1, freq->real_sha1)) {
1358 unlink_or_warn(freq->tmpfile);
1359 return -1;
1360 }
1361 freq->rename =
1362 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1363
1364 return freq->rename;
1365 }
1366
1367 void abort_http_object_request(struct http_object_request *freq)
1368 {
1369 unlink_or_warn(freq->tmpfile);
1370
1371 release_http_object_request(freq);
1372 }
1373
1374 void release_http_object_request(struct http_object_request *freq)
1375 {
1376 if (freq->localfile != -1) {
1377 close(freq->localfile);
1378 freq->localfile = -1;
1379 }
1380 if (freq->url != NULL) {
1381 free(freq->url);
1382 freq->url = NULL;
1383 }
1384 if (freq->slot != NULL) {
1385 freq->slot->callback_func = NULL;
1386 freq->slot->callback_data = NULL;
1387 release_active_slot(freq->slot);
1388 freq->slot = NULL;
1389 }
1390 }
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