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criss cross rename failure workaround
[git/dscho.git] / http.c
blob12c17246e203770e5ef701954f0269b3191a2b4f
1 #include "http.h"
2 #include "pack.h"
3 #include "exec_cmd.h"
4 #include "sideband.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
45 #if LIBCURL_VERSION_NUM >= 0x071700
46 /* Use CURLOPT_KEYPASSWD as is */
47 #elif LIBCURL_VERSION_NUM >= 0x070903
48 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
49 #else
50 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
51 #endif
52
53 static char *ssl_cert_password;
54 static int ssl_cert_password_required;
55
56 static struct curl_slist *pragma_header;
57 static struct curl_slist *no_pragma_header;
58
59 static struct active_request_slot *active_queue_head;
60
61 size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
62 {
63 size_t size = eltsize * nmemb;
64 struct buffer *buffer = buffer_;
65
66 if (size > buffer->buf.len - buffer->posn)
67 size = buffer->buf.len - buffer->posn;
68 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
69 buffer->posn += size;
70
71 return size;
72 }
73
74 #ifndef NO_CURL_IOCTL
75 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
76 {
77 struct buffer *buffer = clientp;
78
79 switch (cmd) {
80 case CURLIOCMD_NOP:
81 return CURLIOE_OK;
82
83 case CURLIOCMD_RESTARTREAD:
84 buffer->posn = 0;
85 return CURLIOE_OK;
86
87 default:
88 return CURLIOE_UNKNOWNCMD;
89 }
90 }
91 #endif
92
93 size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
94 {
95 size_t size = eltsize * nmemb;
96 struct strbuf *buffer = buffer_;
97
98 strbuf_add(buffer, ptr, size);
99 data_received++;
100 return size;
101 }
102
103 size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
104 {
105 data_received++;
106 return eltsize * nmemb;
107 }
108
109 #ifdef USE_CURL_MULTI
110 static void process_curl_messages(void)
111 {
112 int num_messages;
113 struct active_request_slot *slot;
114 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
115
116 while (curl_message != NULL) {
117 if (curl_message->msg == CURLMSG_DONE) {
118 int curl_result = curl_message->data.result;
119 slot = active_queue_head;
120 while (slot != NULL &&
121 slot->curl != curl_message->easy_handle)
122 slot = slot->next;
123 if (slot != NULL) {
124 curl_multi_remove_handle(curlm, slot->curl);
125 slot->curl_result = curl_result;
126 finish_active_slot(slot);
127 } else {
128 fprintf(stderr, "Received DONE message for unknown request!\n");
129 }
130 } else {
131 fprintf(stderr, "Unknown CURL message received: %d\n",
132 (int)curl_message->msg);
133 }
134 curl_message = curl_multi_info_read(curlm, &num_messages);
135 }
136 }
137 #endif
138
139 static int git_config_path(const char **result,
140 const char *var, const char *value)
141 {
142 if (git_config_string(result, var, value))
143 return 1;
144 *result = system_path(*result);
145 return 0;
146 }
147
148 static int http_options(const char *var, const char *value, void *cb)
149 {
150 if (!strcmp("http.sslverify", var)) {
151 curl_ssl_verify = git_config_bool(var, value);
152 return 0;
153 }
154 if (!strcmp("http.sslcert", var))
155 return git_config_path(&ssl_cert, var, value);
156 #if LIBCURL_VERSION_NUM >= 0x070903
157 if (!strcmp("http.sslkey", var))
158 return git_config_path(&ssl_key, var, value);
159 #endif
160 #if LIBCURL_VERSION_NUM >= 0x070908
161 if (!strcmp("http.sslcapath", var))
162 return git_config_path(&ssl_capath, var, value);
163 #endif
164 if (!strcmp("http.sslcainfo", var))
165 return git_config_path(&ssl_cainfo, var, value);
166 if (!strcmp("http.sslcertpasswordprotected", var)) {
167 if (git_config_bool(var, value))
168 ssl_cert_password_required = 1;
169 return 0;
170 }
171 if (!strcmp("http.minsessions", var)) {
172 min_curl_sessions = git_config_int(var, value);
173 #ifndef USE_CURL_MULTI
174 if (min_curl_sessions > 1)
175 min_curl_sessions = 1;
176 #endif
177 return 0;
178 }
179 #ifdef USE_CURL_MULTI
180 if (!strcmp("http.maxrequests", var)) {
181 max_requests = git_config_int(var, value);
182 return 0;
183 }
184 #endif
185 if (!strcmp("http.lowspeedlimit", var)) {
186 curl_low_speed_limit = (long)git_config_int(var, value);
187 return 0;
188 }
189 if (!strcmp("http.lowspeedtime", var)) {
190 curl_low_speed_time = (long)git_config_int(var, value);
191 return 0;
192 }
193
194 if (!strcmp("http.noepsv", var)) {
195 curl_ftp_no_epsv = git_config_bool(var, value);
196 return 0;
197 }
198 if (!strcmp("http.proxy", var))
199 return git_config_string(&curl_http_proxy, var, value);
200
201 if (!strcmp("http.postbuffer", var)) {
202 http_post_buffer = git_config_int(var, value);
203 if (http_post_buffer < LARGE_PACKET_MAX)
204 http_post_buffer = LARGE_PACKET_MAX;
205 return 0;
206 }
207
208 /* Fall back on the default ones */
209 return git_default_config(var, value, cb);
210 }
211
212 static void init_curl_http_auth(CURL *result)
213 {
214 if (user_name) {
215 struct strbuf up = STRBUF_INIT;
216 if (!user_pass)
217 user_pass = xstrdup(getpass("Password: "));
218 strbuf_addf(&up, "%s:%s", user_name, user_pass);
219 curl_easy_setopt(result, CURLOPT_USERPWD,
220 strbuf_detach(&up, NULL));
221 }
222 }
223
224 static int has_cert_password(void)
225 {
226 if (ssl_cert_password != NULL)
227 return 1;
228 if (ssl_cert == NULL || ssl_cert_password_required != 1)
229 return 0;
230 /* Only prompt the user once. */
231 ssl_cert_password_required = -1;
232 ssl_cert_password = getpass("Certificate Password: ");
233 if (ssl_cert_password != NULL) {
234 ssl_cert_password = xstrdup(ssl_cert_password);
235 return 1;
236 } else
237 return 0;
238 }
239
240 static CURL *get_curl_handle(void)
241 {
242 CURL *result = curl_easy_init();
243
244 if (!curl_ssl_verify) {
245 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
246 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
247 } else {
248 /* Verify authenticity of the peer's certificate */
249 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
250 /* The name in the cert must match whom we tried to connect */
251 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
252 }
253
254 #if LIBCURL_VERSION_NUM >= 0x070907
255 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
256 #endif
257 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
258 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
259 #endif
260
261 init_curl_http_auth(result);
262
263 if (ssl_cert != NULL)
264 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
265 if (has_cert_password())
266 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
267 #if LIBCURL_VERSION_NUM >= 0x070903
268 if (ssl_key != NULL)
269 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
270 #endif
271 #if LIBCURL_VERSION_NUM >= 0x070908
272 if (ssl_capath != NULL)
273 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
274 #endif
275 if (ssl_cainfo != NULL)
276 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
277 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
278
279 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
280 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
281 curl_low_speed_limit);
282 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
283 curl_low_speed_time);
284 }
285
286 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
287
288 if (getenv("GIT_CURL_VERBOSE"))
289 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
290
291 curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
292
293 if (curl_ftp_no_epsv)
294 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
295
296 if (curl_http_proxy)
297 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
298
299 return result;
300 }
301
302 static void http_auth_init(const char *url)
303 {
304 char *at, *colon, *cp, *slash;
305 int len;
306
307 cp = strstr(url, "://");
308 if (!cp)
309 return;
310
311 /*
312 * Ok, the URL looks like "proto://something". Which one?
313 * "proto://<user>:<pass>@<host>/...",
314 * "proto://<user>@<host>/...", or just
315 * "proto://<host>/..."?
316 */
317 cp += 3;
318 at = strchr(cp, '@');
319 colon = strchr(cp, ':');
320 slash = strchrnul(cp, '/');
321 if (!at || slash <= at)
322 return; /* No credentials */
323 if (!colon || at <= colon) {
324 /* Only username */
325 len = at - cp;
326 user_name = xmalloc(len + 1);
327 memcpy(user_name, cp, len);
328 user_name[len] = '\0';
329 user_pass = NULL;
330 } else {
331 len = colon - cp;
332 user_name = xmalloc(len + 1);
333 memcpy(user_name, cp, len);
334 user_name[len] = '\0';
335 len = at - (colon + 1);
336 user_pass = xmalloc(len + 1);
337 memcpy(user_pass, colon + 1, len);
338 user_pass[len] = '\0';
339 }
340 }
341
342 static void set_from_env(const char **var, const char *envname)
343 {
344 const char *val = getenv(envname);
345 if (val)
346 *var = val;
347 }
348
349 void http_init(struct remote *remote)
350 {
351 char *low_speed_limit;
352 char *low_speed_time;
353
354 http_is_verbose = 0;
355
356 git_config(http_options, NULL);
357
358 curl_global_init(CURL_GLOBAL_ALL);
359
360 if (remote && remote->http_proxy)
361 curl_http_proxy = xstrdup(remote->http_proxy);
362
363 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
364 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
365
366 #ifdef USE_CURL_MULTI
367 {
368 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
369 if (http_max_requests != NULL)
370 max_requests = atoi(http_max_requests);
371 }
372
373 curlm = curl_multi_init();
374 if (curlm == NULL) {
375 fprintf(stderr, "Error creating curl multi handle.\n");
376 exit(1);
377 }
378 #endif
379
380 if (getenv("GIT_SSL_NO_VERIFY"))
381 curl_ssl_verify = 0;
382
383 set_from_env(&ssl_cert, "GIT_SSL_CERT");
384 #if LIBCURL_VERSION_NUM >= 0x070903
385 set_from_env(&ssl_key, "GIT_SSL_KEY");
386 #endif
387 #if LIBCURL_VERSION_NUM >= 0x070908
388 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
389 #endif
390 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
391
392 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
393 if (low_speed_limit != NULL)
394 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
395 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
396 if (low_speed_time != NULL)
397 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
398
399 if (curl_ssl_verify == -1)
400 curl_ssl_verify = 1;
401
402 curl_session_count = 0;
403 #ifdef USE_CURL_MULTI
404 if (max_requests < 1)
405 max_requests = DEFAULT_MAX_REQUESTS;
406 #endif
407
408 if (getenv("GIT_CURL_FTP_NO_EPSV"))
409 curl_ftp_no_epsv = 1;
410
411 if (remote && remote->url && remote->url[0]) {
412 http_auth_init(remote->url[0]);
413 if (!ssl_cert_password_required &&
414 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
415 !prefixcmp(remote->url[0], "https://"))
416 ssl_cert_password_required = 1;
417 }
418
419 #ifndef NO_CURL_EASY_DUPHANDLE
420 curl_default = get_curl_handle();
421 #endif
422 }
423
424 void http_cleanup(void)
425 {
426 struct active_request_slot *slot = active_queue_head;
427
428 while (slot != NULL) {
429 struct active_request_slot *next = slot->next;
430 if (slot->curl != NULL) {
431 #ifdef USE_CURL_MULTI
432 curl_multi_remove_handle(curlm, slot->curl);
433 #endif
434 curl_easy_cleanup(slot->curl);
435 }
436 free(slot);
437 slot = next;
438 }
439 active_queue_head = NULL;
440
441 #ifndef NO_CURL_EASY_DUPHANDLE
442 curl_easy_cleanup(curl_default);
443 #endif
444
445 #ifdef USE_CURL_MULTI
446 curl_multi_cleanup(curlm);
447 #endif
448 curl_global_cleanup();
449
450 curl_slist_free_all(pragma_header);
451 pragma_header = NULL;
452
453 curl_slist_free_all(no_pragma_header);
454 no_pragma_header = NULL;
455
456 if (curl_http_proxy) {
457 free((void *)curl_http_proxy);
458 curl_http_proxy = NULL;
459 }
460
461 if (ssl_cert_password != NULL) {
462 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
463 free(ssl_cert_password);
464 ssl_cert_password = NULL;
465 }
466 ssl_cert_password_required = 0;
467 }
468
469 struct active_request_slot *get_active_slot(void)
470 {
471 struct active_request_slot *slot = active_queue_head;
472 struct active_request_slot *newslot;
473
474 #ifdef USE_CURL_MULTI
475 int num_transfers;
476
477 /* Wait for a slot to open up if the queue is full */
478 while (active_requests >= max_requests) {
479 curl_multi_perform(curlm, &num_transfers);
480 if (num_transfers < active_requests)
481 process_curl_messages();
482 }
483 #endif
484
485 while (slot != NULL && slot->in_use)
486 slot = slot->next;
487
488 if (slot == NULL) {
489 newslot = xmalloc(sizeof(*newslot));
490 newslot->curl = NULL;
491 newslot->in_use = 0;
492 newslot->next = NULL;
493
494 slot = active_queue_head;
495 if (slot == NULL) {
496 active_queue_head = newslot;
497 } else {
498 while (slot->next != NULL)
499 slot = slot->next;
500 slot->next = newslot;
501 }
502 slot = newslot;
503 }
504
505 if (slot->curl == NULL) {
506 #ifdef NO_CURL_EASY_DUPHANDLE
507 slot->curl = get_curl_handle();
508 #else
509 slot->curl = curl_easy_duphandle(curl_default);
510 #endif
511 curl_session_count++;
512 }
513
514 active_requests++;
515 slot->in_use = 1;
516 slot->local = NULL;
517 slot->results = NULL;
518 slot->finished = NULL;
519 slot->callback_data = NULL;
520 slot->callback_func = NULL;
521 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
522 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
523 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
524 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
525 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
526 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
527 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
528
529 return slot;
530 }
531
532 int start_active_slot(struct active_request_slot *slot)
533 {
534 #ifdef USE_CURL_MULTI
535 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
536 int num_transfers;
537
538 if (curlm_result != CURLM_OK &&
539 curlm_result != CURLM_CALL_MULTI_PERFORM) {
540 active_requests--;
541 slot->in_use = 0;
542 return 0;
543 }
544
545 /*
546 * We know there must be something to do, since we just added
547 * something.
548 */
549 curl_multi_perform(curlm, &num_transfers);
550 #endif
551 return 1;
552 }
553
554 #ifdef USE_CURL_MULTI
555 struct fill_chain {
556 void *data;
557 int (*fill)(void *);
558 struct fill_chain *next;
559 };
560
561 static struct fill_chain *fill_cfg;
562
563 void add_fill_function(void *data, int (*fill)(void *))
564 {
565 struct fill_chain *new = xmalloc(sizeof(*new));
566 struct fill_chain **linkp = &fill_cfg;
567 new->data = data;
568 new->fill = fill;
569 new->next = NULL;
570 while (*linkp)
571 linkp = &(*linkp)->next;
572 *linkp = new;
573 }
574
575 void fill_active_slots(void)
576 {
577 struct active_request_slot *slot = active_queue_head;
578
579 while (active_requests < max_requests) {
580 struct fill_chain *fill;
581 for (fill = fill_cfg; fill; fill = fill->next)
582 if (fill->fill(fill->data))
583 break;
584
585 if (!fill)
586 break;
587 }
588
589 while (slot != NULL) {
590 if (!slot->in_use && slot->curl != NULL
591 && curl_session_count > min_curl_sessions) {
592 curl_easy_cleanup(slot->curl);
593 slot->curl = NULL;
594 curl_session_count--;
595 }
596 slot = slot->next;
597 }
598 }
599
600 void step_active_slots(void)
601 {
602 int num_transfers;
603 CURLMcode curlm_result;
604
605 do {
606 curlm_result = curl_multi_perform(curlm, &num_transfers);
607 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
608 if (num_transfers < active_requests) {
609 process_curl_messages();
610 fill_active_slots();
611 }
612 }
613 #endif
614
615 void run_active_slot(struct active_request_slot *slot)
616 {
617 #ifdef USE_CURL_MULTI
618 long last_pos = 0;
619 long current_pos;
620 fd_set readfds;
621 fd_set writefds;
622 fd_set excfds;
623 int max_fd;
624 struct timeval select_timeout;
625 int finished = 0;
626
627 slot->finished = &finished;
628 while (!finished) {
629 data_received = 0;
630 step_active_slots();
631
632 if (!data_received && slot->local != NULL) {
633 current_pos = ftell(slot->local);
634 if (current_pos > last_pos)
635 data_received++;
636 last_pos = current_pos;
637 }
638
639 if (slot->in_use && !data_received) {
640 max_fd = 0;
641 FD_ZERO(&readfds);
642 FD_ZERO(&writefds);
643 FD_ZERO(&excfds);
644 select_timeout.tv_sec = 0;
645 select_timeout.tv_usec = 50000;
646 select(max_fd, &readfds, &writefds,
647 &excfds, &select_timeout);
648 }
649 }
650 #else
651 while (slot->in_use) {
652 slot->curl_result = curl_easy_perform(slot->curl);
653 finish_active_slot(slot);
654 }
655 #endif
656 }
657
658 static void closedown_active_slot(struct active_request_slot *slot)
659 {
660 active_requests--;
661 slot->in_use = 0;
662 }
663
664 static void release_active_slot(struct active_request_slot *slot)
665 {
666 closedown_active_slot(slot);
667 if (slot->curl && curl_session_count > min_curl_sessions) {
668 #ifdef USE_CURL_MULTI
669 curl_multi_remove_handle(curlm, slot->curl);
670 #endif
671 curl_easy_cleanup(slot->curl);
672 slot->curl = NULL;
673 curl_session_count--;
674 }
675 #ifdef USE_CURL_MULTI
676 fill_active_slots();
677 #endif
678 }
679
680 void finish_active_slot(struct active_request_slot *slot)
681 {
682 closedown_active_slot(slot);
683 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
684
685 if (slot->finished != NULL)
686 (*slot->finished) = 1;
687
688 /* Store slot results so they can be read after the slot is reused */
689 if (slot->results != NULL) {
690 slot->results->curl_result = slot->curl_result;
691 slot->results->http_code = slot->http_code;
692 }
693
694 /* Run callback if appropriate */
695 if (slot->callback_func != NULL)
696 slot->callback_func(slot->callback_data);
697 }
698
699 void finish_all_active_slots(void)
700 {
701 struct active_request_slot *slot = active_queue_head;
702
703 while (slot != NULL)
704 if (slot->in_use) {
705 run_active_slot(slot);
706 slot = active_queue_head;
707 } else {
708 slot = slot->next;
709 }
710 }
711
712 /* Helpers for modifying and creating URLs */
713 static inline int needs_quote(int ch)
714 {
715 if (((ch >= 'A') && (ch <= 'Z'))
716 || ((ch >= 'a') && (ch <= 'z'))
717 || ((ch >= '0') && (ch <= '9'))
718 || (ch == '/')
719 || (ch == '-')
720 || (ch == '.'))
721 return 0;
722 return 1;
723 }
724
725 static inline int hex(int v)
726 {
727 if (v < 10)
728 return '0' + v;
729 else
730 return 'A' + v - 10;
731 }
732
733 static void end_url_with_slash(struct strbuf *buf, const char *url)
734 {
735 strbuf_addstr(buf, url);
736 if (buf->len && buf->buf[buf->len - 1] != '/')
737 strbuf_addstr(buf, "/");
738 }
739
740 static char *quote_ref_url(const char *base, const char *ref)
741 {
742 struct strbuf buf = STRBUF_INIT;
743 const char *cp;
744 int ch;
745
746 end_url_with_slash(&buf, base);
747
748 for (cp = ref; (ch = *cp) != 0; cp++)
749 if (needs_quote(ch))
750 strbuf_addf(&buf, "%%%02x", ch);
751 else
752 strbuf_addch(&buf, *cp);
753
754 return strbuf_detach(&buf, NULL);
755 }
756
757 void append_remote_object_url(struct strbuf *buf, const char *url,
758 const char *hex,
759 int only_two_digit_prefix)
760 {
761 end_url_with_slash(buf, url);
762
763 strbuf_addf(buf, "objects/%.*s/", 2, hex);
764 if (!only_two_digit_prefix)
765 strbuf_addf(buf, "%s", hex+2);
766 }
767
768 char *get_remote_object_url(const char *url, const char *hex,
769 int only_two_digit_prefix)
770 {
771 struct strbuf buf = STRBUF_INIT;
772 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
773 return strbuf_detach(&buf, NULL);
774 }
775
776 /* http_request() targets */
777 #define HTTP_REQUEST_STRBUF 0
778 #define HTTP_REQUEST_FILE 1
779
780 static int http_request(const char *url, void *result, int target, int options)
781 {
782 struct active_request_slot *slot;
783 struct slot_results results;
784 struct curl_slist *headers = NULL;
785 struct strbuf buf = STRBUF_INIT;
786 int ret;
787
788 slot = get_active_slot();
789 slot->results = &results;
790 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
791
792 if (result == NULL) {
793 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
794 } else {
795 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
796 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
797
798 if (target == HTTP_REQUEST_FILE) {
799 long posn = ftell(result);
800 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
801 fwrite);
802 if (posn > 0) {
803 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
804 headers = curl_slist_append(headers, buf.buf);
805 strbuf_reset(&buf);
806 }
807 slot->local = result;
808 } else
809 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
810 fwrite_buffer);
811 }
812
813 strbuf_addstr(&buf, "Pragma:");
814 if (options & HTTP_NO_CACHE)
815 strbuf_addstr(&buf, " no-cache");
816
817 headers = curl_slist_append(headers, buf.buf);
818
819 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
820 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
821
822 if (start_active_slot(slot)) {
823 run_active_slot(slot);
824 if (results.curl_result == CURLE_OK)
825 ret = HTTP_OK;
826 else if (missing_target(&results))
827 ret = HTTP_MISSING_TARGET;
828 else
829 ret = HTTP_ERROR;
830 } else {
831 error("Unable to start HTTP request for %s", url);
832 ret = HTTP_START_FAILED;
833 }
834
835 slot->local = NULL;
836 curl_slist_free_all(headers);
837 strbuf_release(&buf);
838
839 return ret;
840 }
841
842 int http_get_strbuf(const char *url, struct strbuf *result, int options)
843 {
844 return http_request(url, result, HTTP_REQUEST_STRBUF, options);
845 }
846
847 /*
848 * Downloads an url and stores the result in the given file.
849 *
850 * If a previous interrupted download is detected (i.e. a previous temporary
851 * file is still around) the download is resumed.
852 */
853 static int http_get_file(const char *url, const char *filename, int options)
854 {
855 int ret;
856 struct strbuf tmpfile = STRBUF_INIT;
857 FILE *result;
858
859 strbuf_addf(&tmpfile, "%s.temp", filename);
860 result = fopen(tmpfile.buf, "a");
861 if (! result) {
862 error("Unable to open local file %s", tmpfile.buf);
863 ret = HTTP_ERROR;
864 goto cleanup;
865 }
866
867 ret = http_request(url, result, HTTP_REQUEST_FILE, options);
868 fclose(result);
869
870 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
871 ret = HTTP_ERROR;
872 cleanup:
873 strbuf_release(&tmpfile);
874 return ret;
875 }
876
877 int http_error(const char *url, int ret)
878 {
879 /* http_request has already handled HTTP_START_FAILED. */
880 if (ret != HTTP_START_FAILED)
881 error("%s while accessing %s\n", curl_errorstr, url);
882
883 return ret;
884 }
885
886 int http_fetch_ref(const char *base, struct ref *ref)
887 {
888 char *url;
889 struct strbuf buffer = STRBUF_INIT;
890 int ret = -1;
891
892 url = quote_ref_url(base, ref->name);
893 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
894 strbuf_rtrim(&buffer);
895 if (buffer.len == 40)
896 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
897 else if (!prefixcmp(buffer.buf, "ref: ")) {
898 ref->symref = xstrdup(buffer.buf + 5);
899 ret = 0;
900 }
901 }
902
903 strbuf_release(&buffer);
904 free(url);
905 return ret;
906 }
907
908 /* Helpers for fetching packs */
909 static int fetch_pack_index(unsigned char *sha1, const char *base_url)
910 {
911 int ret = 0;
912 char *hex = xstrdup(sha1_to_hex(sha1));
913 char *filename;
914 char *url = NULL;
915 struct strbuf buf = STRBUF_INIT;
916
917 if (has_pack_index(sha1)) {
918 ret = 0;
919 goto cleanup;
920 }
921
922 if (http_is_verbose)
923 fprintf(stderr, "Getting index for pack %s\n", hex);
924
925 end_url_with_slash(&buf, base_url);
926 strbuf_addf(&buf, "objects/pack/pack-%s.idx", hex);
927 url = strbuf_detach(&buf, NULL);
928
929 filename = sha1_pack_index_name(sha1);
930 if (http_get_file(url, filename, 0) != HTTP_OK)
931 ret = error("Unable to get pack index %s\n", url);
932
933 cleanup:
934 free(hex);
935 free(url);
936 return ret;
937 }
938
939 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
940 unsigned char *sha1, const char *base_url)
941 {
942 struct packed_git *new_pack;
943
944 if (fetch_pack_index(sha1, base_url))
945 return -1;
946
947 new_pack = parse_pack_index(sha1);
948 if (!new_pack)
949 return -1; /* parse_pack_index() already issued error message */
950 new_pack->next = *packs_head;
951 *packs_head = new_pack;
952 return 0;
953 }
954
955 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
956 {
957 int ret = 0, i = 0;
958 char *url, *data;
959 struct strbuf buf = STRBUF_INIT;
960 unsigned char sha1[20];
961
962 end_url_with_slash(&buf, base_url);
963 strbuf_addstr(&buf, "objects/info/packs");
964 url = strbuf_detach(&buf, NULL);
965
966 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
967 if (ret != HTTP_OK)
968 goto cleanup;
969
970 data = buf.buf;
971 while (i < buf.len) {
972 switch (data[i]) {
973 case 'P':
974 i++;
975 if (i + 52 <= buf.len &&
976 !prefixcmp(data + i, " pack-") &&
977 !prefixcmp(data + i + 46, ".pack\n")) {
978 get_sha1_hex(data + i + 6, sha1);
979 fetch_and_setup_pack_index(packs_head, sha1,
980 base_url);
981 i += 51;
982 break;
983 }
984 default:
985 while (i < buf.len && data[i] != '\n')
986 i++;
987 }
988 i++;
989 }
990
991 cleanup:
992 free(url);
993 return ret;
994 }
995
996 void release_http_pack_request(struct http_pack_request *preq)
997 {
998 if (preq->packfile != NULL) {
999 fclose(preq->packfile);
1000 preq->packfile = NULL;
1001 preq->slot->local = NULL;
1002 }
1003 if (preq->range_header != NULL) {
1004 curl_slist_free_all(preq->range_header);
1005 preq->range_header = NULL;
1006 }
1007 preq->slot = NULL;
1008 free(preq->url);
1009 }
1010
1011 int finish_http_pack_request(struct http_pack_request *preq)
1012 {
1013 int ret;
1014 struct packed_git **lst;
1015
1016 preq->target->pack_size = ftell(preq->packfile);
1017
1018 if (preq->packfile != NULL) {
1019 fclose(preq->packfile);
1020 preq->packfile = NULL;
1021 preq->slot->local = NULL;
1022 }
1023
1024 ret = move_temp_to_file(preq->tmpfile, preq->filename);
1025 if (ret)
1026 return ret;
1027
1028 lst = preq->lst;
1029 while (*lst != preq->target)
1030 lst = &((*lst)->next);
1031 *lst = (*lst)->next;
1032
1033 if (verify_pack(preq->target))
1034 return -1;
1035 install_packed_git(preq->target);
1036
1037 return 0;
1038 }
1039
1040 struct http_pack_request *new_http_pack_request(
1041 struct packed_git *target, const char *base_url)
1042 {
1043 char *filename;
1044 long prev_posn = 0;
1045 char range[RANGE_HEADER_SIZE];
1046 struct strbuf buf = STRBUF_INIT;
1047 struct http_pack_request *preq;
1048
1049 preq = xmalloc(sizeof(*preq));
1050 preq->target = target;
1051 preq->range_header = NULL;
1052
1053 end_url_with_slash(&buf, base_url);
1054 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1055 sha1_to_hex(target->sha1));
1056 preq->url = strbuf_detach(&buf, NULL);
1057
1058 filename = sha1_pack_name(target->sha1);
1059 snprintf(preq->filename, sizeof(preq->filename), "%s", filename);
1060 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp", filename);
1061 preq->packfile = fopen(preq->tmpfile, "a");
1062 if (!preq->packfile) {
1063 error("Unable to open local file %s for pack",
1064 preq->tmpfile);
1065 goto abort;
1066 }
1067
1068 preq->slot = get_active_slot();
1069 preq->slot->local = preq->packfile;
1070 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1071 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1072 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1073 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1074 no_pragma_header);
1075
1076 /*
1077 * If there is data present from a previous transfer attempt,
1078 * resume where it left off
1079 */
1080 prev_posn = ftell(preq->packfile);
1081 if (prev_posn>0) {
1082 if (http_is_verbose)
1083 fprintf(stderr,
1084 "Resuming fetch of pack %s at byte %ld\n",
1085 sha1_to_hex(target->sha1), prev_posn);
1086 sprintf(range, "Range: bytes=%ld-", prev_posn);
1087 preq->range_header = curl_slist_append(NULL, range);
1088 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1089 preq->range_header);
1090 }
1091
1092 return preq;
1093
1094 abort:
1095 free(filename);
1096 free(preq->url);
1097 free(preq);
1098 return NULL;
1099 }
1100
1101 /* Helpers for fetching objects (loose) */
1102 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
1103 void *data)
1104 {
1105 unsigned char expn[4096];
1106 size_t size = eltsize * nmemb;
1107 int posn = 0;
1108 struct http_object_request *freq =
1109 (struct http_object_request *)data;
1110 do {
1111 ssize_t retval = xwrite(freq->localfile,
1112 (char *) ptr + posn, size - posn);
1113 if (retval < 0)
1114 return posn;
1115 posn += retval;
1116 } while (posn < size);
1117
1118 freq->stream.avail_in = size;
1119 freq->stream.next_in = ptr;
1120 do {
1121 freq->stream.next_out = expn;
1122 freq->stream.avail_out = sizeof(expn);
1123 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1124 git_SHA1_Update(&freq->c, expn,
1125 sizeof(expn) - freq->stream.avail_out);
1126 } while (freq->stream.avail_in && freq->zret == Z_OK);
1127 data_received++;
1128 return size;
1129 }
1130
1131 struct http_object_request *new_http_object_request(const char *base_url,
1132 unsigned char *sha1)
1133 {
1134 char *hex = sha1_to_hex(sha1);
1135 char *filename;
1136 char prevfile[PATH_MAX];
1137 int prevlocal;
1138 unsigned char prev_buf[PREV_BUF_SIZE];
1139 ssize_t prev_read = 0;
1140 long prev_posn = 0;
1141 char range[RANGE_HEADER_SIZE];
1142 struct curl_slist *range_header = NULL;
1143 struct http_object_request *freq;
1144
1145 freq = xmalloc(sizeof(*freq));
1146 hashcpy(freq->sha1, sha1);
1147 freq->localfile = -1;
1148
1149 filename = sha1_file_name(sha1);
1150 snprintf(freq->filename, sizeof(freq->filename), "%s", filename);
1151 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1152 "%s.temp", filename);
1153
1154 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1155 unlink_or_warn(prevfile);
1156 rename(freq->tmpfile, prevfile);
1157 unlink_or_warn(freq->tmpfile);
1158
1159 if (freq->localfile != -1)
1160 error("fd leakage in start: %d", freq->localfile);
1161 freq->localfile = open(freq->tmpfile,
1162 O_WRONLY | O_CREAT | O_EXCL, 0666);
1163 /*
1164 * This could have failed due to the "lazy directory creation";
1165 * try to mkdir the last path component.
1166 */
1167 if (freq->localfile < 0 && errno == ENOENT) {
1168 char *dir = strrchr(freq->tmpfile, '/');
1169 if (dir) {
1170 *dir = 0;
1171 mkdir(freq->tmpfile, 0777);
1172 *dir = '/';
1173 }
1174 freq->localfile = open(freq->tmpfile,
1175 O_WRONLY | O_CREAT | O_EXCL, 0666);
1176 }
1177
1178 if (freq->localfile < 0) {
1179 error("Couldn't create temporary file %s for %s: %s",
1180 freq->tmpfile, freq->filename, strerror(errno));
1181 goto abort;
1182 }
1183
1184 memset(&freq->stream, 0, sizeof(freq->stream));
1185
1186 git_inflate_init(&freq->stream);
1187
1188 git_SHA1_Init(&freq->c);
1189
1190 freq->url = get_remote_object_url(base_url, hex, 0);
1191
1192 /*
1193 * If a previous temp file is present, process what was already
1194 * fetched.
1195 */
1196 prevlocal = open(prevfile, O_RDONLY);
1197 if (prevlocal != -1) {
1198 do {
1199 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1200 if (prev_read>0) {
1201 if (fwrite_sha1_file(prev_buf,
1202 1,
1203 prev_read,
1204 freq) == prev_read) {
1205 prev_posn += prev_read;
1206 } else {
1207 prev_read = -1;
1208 }
1209 }
1210 } while (prev_read > 0);
1211 close(prevlocal);
1212 }
1213 unlink_or_warn(prevfile);
1214
1215 /*
1216 * Reset inflate/SHA1 if there was an error reading the previous temp
1217 * file; also rewind to the beginning of the local file.
1218 */
1219 if (prev_read == -1) {
1220 memset(&freq->stream, 0, sizeof(freq->stream));
1221 git_inflate_init(&freq->stream);
1222 git_SHA1_Init(&freq->c);
1223 if (prev_posn>0) {
1224 prev_posn = 0;
1225 lseek(freq->localfile, 0, SEEK_SET);
1226 if (ftruncate(freq->localfile, 0) < 0) {
1227 error("Couldn't truncate temporary file %s for %s: %s",
1228 freq->tmpfile, freq->filename, strerror(errno));
1229 goto abort;
1230 }
1231 }
1232 }
1233
1234 freq->slot = get_active_slot();
1235
1236 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1237 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1238 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1239 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1240 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1241
1242 /*
1243 * If we have successfully processed data from a previous fetch
1244 * attempt, only fetch the data we don't already have.
1245 */
1246 if (prev_posn>0) {
1247 if (http_is_verbose)
1248 fprintf(stderr,
1249 "Resuming fetch of object %s at byte %ld\n",
1250 hex, prev_posn);
1251 sprintf(range, "Range: bytes=%ld-", prev_posn);
1252 range_header = curl_slist_append(range_header, range);
1253 curl_easy_setopt(freq->slot->curl,
1254 CURLOPT_HTTPHEADER, range_header);
1255 }
1256
1257 return freq;
1258
1259 abort:
1260 free(filename);
1261 free(freq->url);
1262 free(freq);
1263 return NULL;
1264 }
1265
1266 void process_http_object_request(struct http_object_request *freq)
1267 {
1268 if (freq->slot == NULL)
1269 return;
1270 freq->curl_result = freq->slot->curl_result;
1271 freq->http_code = freq->slot->http_code;
1272 freq->slot = NULL;
1273 }
1274
1275 int finish_http_object_request(struct http_object_request *freq)
1276 {
1277 struct stat st;
1278
1279 close(freq->localfile);
1280 freq->localfile = -1;
1281
1282 process_http_object_request(freq);
1283
1284 if (freq->http_code == 416) {
1285 warning("requested range invalid; we may already have all the data.");
1286 } else if (freq->curl_result != CURLE_OK) {
1287 if (stat(freq->tmpfile, &st) == 0)
1288 if (st.st_size == 0)
1289 unlink_or_warn(freq->tmpfile);
1290 return -1;
1291 }
1292
1293 git_inflate_end(&freq->stream);
1294 git_SHA1_Final(freq->real_sha1, &freq->c);
1295 if (freq->zret != Z_STREAM_END) {
1296 unlink_or_warn(freq->tmpfile);
1297 return -1;
1298 }
1299 if (hashcmp(freq->sha1, freq->real_sha1)) {
1300 unlink_or_warn(freq->tmpfile);
1301 return -1;
1302 }
1303 freq->rename =
1304 move_temp_to_file(freq->tmpfile, freq->filename);
1305
1306 return freq->rename;
1307 }
1308
1309 void abort_http_object_request(struct http_object_request *freq)
1310 {
1311 unlink_or_warn(freq->tmpfile);
1312
1313 release_http_object_request(freq);
1314 }
1315
1316 void release_http_object_request(struct http_object_request *freq)
1317 {
1318 if (freq->localfile != -1) {
1319 close(freq->localfile);
1320 freq->localfile = -1;
1321 }
1322 if (freq->url != NULL) {
1323 free(freq->url);
1324 freq->url = NULL;
1325 }
1326 if (freq->slot != NULL) {
1327 freq->slot->callback_func = NULL;
1328 freq->slot->callback_data = NULL;
1329 release_active_slot(freq->slot);
1330 freq->slot = NULL;
1331 }
1332 }
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