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merge-file --diff3: add a label for ancestor
[git/kirr.git] / http.c
blob4814217c6401faa1fd8f13f0288758f57b5e3755
1 #include "http.h"
2 #include "pack.h"
3 #include "sideband.h"
4
5 int data_received;
6 int active_requests;
7 int http_is_verbose;
8 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
9
10 #if LIBCURL_VERSION_NUM >= 0x070a06
11 #define LIBCURL_CAN_HANDLE_AUTH_ANY
12 #endif
13
14 static int min_curl_sessions = 1;
15 static int curl_session_count;
16 #ifdef USE_CURL_MULTI
17 static int max_requests = -1;
18 static CURLM *curlm;
19 #endif
20 #ifndef NO_CURL_EASY_DUPHANDLE
21 static CURL *curl_default;
22 #endif
23
24 #define PREV_BUF_SIZE 4096
25 #define RANGE_HEADER_SIZE 30
26
27 char curl_errorstr[CURL_ERROR_SIZE];
28
29 static int curl_ssl_verify = -1;
30 static const char *ssl_cert;
31 #if LIBCURL_VERSION_NUM >= 0x070903
32 static const char *ssl_key;
33 #endif
34 #if LIBCURL_VERSION_NUM >= 0x070908
35 static const char *ssl_capath;
36 #endif
37 static const char *ssl_cainfo;
38 static long curl_low_speed_limit = -1;
39 static long curl_low_speed_time = -1;
40 static int curl_ftp_no_epsv;
41 static const char *curl_http_proxy;
42 static char *user_name, *user_pass;
43
44 #if LIBCURL_VERSION_NUM >= 0x071700
45 /* Use CURLOPT_KEYPASSWD as is */
46 #elif LIBCURL_VERSION_NUM >= 0x070903
47 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
48 #else
49 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
50 #endif
51
52 static char *ssl_cert_password;
53 static int ssl_cert_password_required;
54
55 static struct curl_slist *pragma_header;
56 static struct curl_slist *no_pragma_header;
57
58 static struct active_request_slot *active_queue_head;
59
60 size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
61 {
62 size_t size = eltsize * nmemb;
63 struct buffer *buffer = buffer_;
64
65 if (size > buffer->buf.len - buffer->posn)
66 size = buffer->buf.len - buffer->posn;
67 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
68 buffer->posn += size;
69
70 return size;
71 }
72
73 #ifndef NO_CURL_IOCTL
74 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
75 {
76 struct buffer *buffer = clientp;
77
78 switch (cmd) {
79 case CURLIOCMD_NOP:
80 return CURLIOE_OK;
81
82 case CURLIOCMD_RESTARTREAD:
83 buffer->posn = 0;
84 return CURLIOE_OK;
85
86 default:
87 return CURLIOE_UNKNOWNCMD;
88 }
89 }
90 #endif
91
92 size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
93 {
94 size_t size = eltsize * nmemb;
95 struct strbuf *buffer = buffer_;
96
97 strbuf_add(buffer, ptr, size);
98 data_received++;
99 return size;
100 }
101
102 size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
103 {
104 data_received++;
105 return eltsize * nmemb;
106 }
107
108 #ifdef USE_CURL_MULTI
109 static void process_curl_messages(void)
110 {
111 int num_messages;
112 struct active_request_slot *slot;
113 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
114
115 while (curl_message != NULL) {
116 if (curl_message->msg == CURLMSG_DONE) {
117 int curl_result = curl_message->data.result;
118 slot = active_queue_head;
119 while (slot != NULL &&
120 slot->curl != curl_message->easy_handle)
121 slot = slot->next;
122 if (slot != NULL) {
123 curl_multi_remove_handle(curlm, slot->curl);
124 slot->curl_result = curl_result;
125 finish_active_slot(slot);
126 } else {
127 fprintf(stderr, "Received DONE message for unknown request!\n");
128 }
129 } else {
130 fprintf(stderr, "Unknown CURL message received: %d\n",
131 (int)curl_message->msg);
132 }
133 curl_message = curl_multi_info_read(curlm, &num_messages);
134 }
135 }
136 #endif
137
138 static int http_options(const char *var, const char *value, void *cb)
139 {
140 if (!strcmp("http.sslverify", var)) {
141 curl_ssl_verify = git_config_bool(var, value);
142 return 0;
143 }
144 if (!strcmp("http.sslcert", var))
145 return git_config_string(&ssl_cert, var, value);
146 #if LIBCURL_VERSION_NUM >= 0x070903
147 if (!strcmp("http.sslkey", var))
148 return git_config_string(&ssl_key, var, value);
149 #endif
150 #if LIBCURL_VERSION_NUM >= 0x070908
151 if (!strcmp("http.sslcapath", var))
152 return git_config_string(&ssl_capath, var, value);
153 #endif
154 if (!strcmp("http.sslcainfo", var))
155 return git_config_string(&ssl_cainfo, var, value);
156 if (!strcmp("http.sslcertpasswordprotected", var)) {
157 if (git_config_bool(var, value))
158 ssl_cert_password_required = 1;
159 return 0;
160 }
161 if (!strcmp("http.minsessions", var)) {
162 min_curl_sessions = git_config_int(var, value);
163 #ifndef USE_CURL_MULTI
164 if (min_curl_sessions > 1)
165 min_curl_sessions = 1;
166 #endif
167 return 0;
168 }
169 #ifdef USE_CURL_MULTI
170 if (!strcmp("http.maxrequests", var)) {
171 max_requests = git_config_int(var, value);
172 return 0;
173 }
174 #endif
175 if (!strcmp("http.lowspeedlimit", var)) {
176 curl_low_speed_limit = (long)git_config_int(var, value);
177 return 0;
178 }
179 if (!strcmp("http.lowspeedtime", var)) {
180 curl_low_speed_time = (long)git_config_int(var, value);
181 return 0;
182 }
183
184 if (!strcmp("http.noepsv", var)) {
185 curl_ftp_no_epsv = git_config_bool(var, value);
186 return 0;
187 }
188 if (!strcmp("http.proxy", var))
189 return git_config_string(&curl_http_proxy, var, value);
190
191 if (!strcmp("http.postbuffer", var)) {
192 http_post_buffer = git_config_int(var, value);
193 if (http_post_buffer < LARGE_PACKET_MAX)
194 http_post_buffer = LARGE_PACKET_MAX;
195 return 0;
196 }
197
198 /* Fall back on the default ones */
199 return git_default_config(var, value, cb);
200 }
201
202 static void init_curl_http_auth(CURL *result)
203 {
204 if (user_name) {
205 struct strbuf up = STRBUF_INIT;
206 if (!user_pass)
207 user_pass = xstrdup(git_getpass("Password: "));
208 strbuf_addf(&up, "%s:%s", user_name, user_pass);
209 curl_easy_setopt(result, CURLOPT_USERPWD,
210 strbuf_detach(&up, NULL));
211 }
212 }
213
214 static int has_cert_password(void)
215 {
216 if (ssl_cert_password != NULL)
217 return 1;
218 if (ssl_cert == NULL || ssl_cert_password_required != 1)
219 return 0;
220 /* Only prompt the user once. */
221 ssl_cert_password_required = -1;
222 ssl_cert_password = git_getpass("Certificate Password: ");
223 if (ssl_cert_password != NULL) {
224 ssl_cert_password = xstrdup(ssl_cert_password);
225 return 1;
226 } else
227 return 0;
228 }
229
230 static CURL *get_curl_handle(void)
231 {
232 CURL *result = curl_easy_init();
233
234 if (!curl_ssl_verify) {
235 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
236 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
237 } else {
238 /* Verify authenticity of the peer's certificate */
239 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
240 /* The name in the cert must match whom we tried to connect */
241 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
242 }
243
244 #if LIBCURL_VERSION_NUM >= 0x070907
245 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
246 #endif
247 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
248 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
249 #endif
250
251 init_curl_http_auth(result);
252
253 if (ssl_cert != NULL)
254 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
255 if (has_cert_password())
256 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
257 #if LIBCURL_VERSION_NUM >= 0x070903
258 if (ssl_key != NULL)
259 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
260 #endif
261 #if LIBCURL_VERSION_NUM >= 0x070908
262 if (ssl_capath != NULL)
263 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
264 #endif
265 if (ssl_cainfo != NULL)
266 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
267 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
268
269 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
270 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
271 curl_low_speed_limit);
272 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
273 curl_low_speed_time);
274 }
275
276 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
277
278 if (getenv("GIT_CURL_VERBOSE"))
279 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
280
281 curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
282
283 if (curl_ftp_no_epsv)
284 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
285
286 if (curl_http_proxy)
287 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
288
289 return result;
290 }
291
292 static void http_auth_init(const char *url)
293 {
294 char *at, *colon, *cp, *slash;
295 int len;
296
297 cp = strstr(url, "://");
298 if (!cp)
299 return;
300
301 /*
302 * Ok, the URL looks like "proto://something". Which one?
303 * "proto://<user>:<pass>@<host>/...",
304 * "proto://<user>@<host>/...", or just
305 * "proto://<host>/..."?
306 */
307 cp += 3;
308 at = strchr(cp, '@');
309 colon = strchr(cp, ':');
310 slash = strchrnul(cp, '/');
311 if (!at || slash <= at)
312 return; /* No credentials */
313 if (!colon || at <= colon) {
314 /* Only username */
315 len = at - cp;
316 user_name = xmalloc(len + 1);
317 memcpy(user_name, cp, len);
318 user_name[len] = '\0';
319 user_pass = NULL;
320 } else {
321 len = colon - cp;
322 user_name = xmalloc(len + 1);
323 memcpy(user_name, cp, len);
324 user_name[len] = '\0';
325 len = at - (colon + 1);
326 user_pass = xmalloc(len + 1);
327 memcpy(user_pass, colon + 1, len);
328 user_pass[len] = '\0';
329 }
330 }
331
332 static void set_from_env(const char **var, const char *envname)
333 {
334 const char *val = getenv(envname);
335 if (val)
336 *var = val;
337 }
338
339 void http_init(struct remote *remote)
340 {
341 char *low_speed_limit;
342 char *low_speed_time;
343
344 http_is_verbose = 0;
345
346 git_config(http_options, NULL);
347
348 curl_global_init(CURL_GLOBAL_ALL);
349
350 if (remote && remote->http_proxy)
351 curl_http_proxy = xstrdup(remote->http_proxy);
352
353 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
354 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
355
356 #ifdef USE_CURL_MULTI
357 {
358 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
359 if (http_max_requests != NULL)
360 max_requests = atoi(http_max_requests);
361 }
362
363 curlm = curl_multi_init();
364 if (curlm == NULL) {
365 fprintf(stderr, "Error creating curl multi handle.\n");
366 exit(1);
367 }
368 #endif
369
370 if (getenv("GIT_SSL_NO_VERIFY"))
371 curl_ssl_verify = 0;
372
373 set_from_env(&ssl_cert, "GIT_SSL_CERT");
374 #if LIBCURL_VERSION_NUM >= 0x070903
375 set_from_env(&ssl_key, "GIT_SSL_KEY");
376 #endif
377 #if LIBCURL_VERSION_NUM >= 0x070908
378 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
379 #endif
380 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
381
382 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
383 if (low_speed_limit != NULL)
384 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
385 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
386 if (low_speed_time != NULL)
387 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
388
389 if (curl_ssl_verify == -1)
390 curl_ssl_verify = 1;
391
392 curl_session_count = 0;
393 #ifdef USE_CURL_MULTI
394 if (max_requests < 1)
395 max_requests = DEFAULT_MAX_REQUESTS;
396 #endif
397
398 if (getenv("GIT_CURL_FTP_NO_EPSV"))
399 curl_ftp_no_epsv = 1;
400
401 if (remote && remote->url && remote->url[0]) {
402 http_auth_init(remote->url[0]);
403 if (!ssl_cert_password_required &&
404 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
405 !prefixcmp(remote->url[0], "https://"))
406 ssl_cert_password_required = 1;
407 }
408
409 #ifndef NO_CURL_EASY_DUPHANDLE
410 curl_default = get_curl_handle();
411 #endif
412 }
413
414 void http_cleanup(void)
415 {
416 struct active_request_slot *slot = active_queue_head;
417
418 while (slot != NULL) {
419 struct active_request_slot *next = slot->next;
420 if (slot->curl != NULL) {
421 #ifdef USE_CURL_MULTI
422 curl_multi_remove_handle(curlm, slot->curl);
423 #endif
424 curl_easy_cleanup(slot->curl);
425 }
426 free(slot);
427 slot = next;
428 }
429 active_queue_head = NULL;
430
431 #ifndef NO_CURL_EASY_DUPHANDLE
432 curl_easy_cleanup(curl_default);
433 #endif
434
435 #ifdef USE_CURL_MULTI
436 curl_multi_cleanup(curlm);
437 #endif
438 curl_global_cleanup();
439
440 curl_slist_free_all(pragma_header);
441 pragma_header = NULL;
442
443 curl_slist_free_all(no_pragma_header);
444 no_pragma_header = NULL;
445
446 if (curl_http_proxy) {
447 free((void *)curl_http_proxy);
448 curl_http_proxy = NULL;
449 }
450
451 if (ssl_cert_password != NULL) {
452 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
453 free(ssl_cert_password);
454 ssl_cert_password = NULL;
455 }
456 ssl_cert_password_required = 0;
457 }
458
459 struct active_request_slot *get_active_slot(void)
460 {
461 struct active_request_slot *slot = active_queue_head;
462 struct active_request_slot *newslot;
463
464 #ifdef USE_CURL_MULTI
465 int num_transfers;
466
467 /* Wait for a slot to open up if the queue is full */
468 while (active_requests >= max_requests) {
469 curl_multi_perform(curlm, &num_transfers);
470 if (num_transfers < active_requests)
471 process_curl_messages();
472 }
473 #endif
474
475 while (slot != NULL && slot->in_use)
476 slot = slot->next;
477
478 if (slot == NULL) {
479 newslot = xmalloc(sizeof(*newslot));
480 newslot->curl = NULL;
481 newslot->in_use = 0;
482 newslot->next = NULL;
483
484 slot = active_queue_head;
485 if (slot == NULL) {
486 active_queue_head = newslot;
487 } else {
488 while (slot->next != NULL)
489 slot = slot->next;
490 slot->next = newslot;
491 }
492 slot = newslot;
493 }
494
495 if (slot->curl == NULL) {
496 #ifdef NO_CURL_EASY_DUPHANDLE
497 slot->curl = get_curl_handle();
498 #else
499 slot->curl = curl_easy_duphandle(curl_default);
500 #endif
501 curl_session_count++;
502 }
503
504 active_requests++;
505 slot->in_use = 1;
506 slot->local = NULL;
507 slot->results = NULL;
508 slot->finished = NULL;
509 slot->callback_data = NULL;
510 slot->callback_func = NULL;
511 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
512 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
513 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
514 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
515 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
516 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
517 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
518
519 return slot;
520 }
521
522 int start_active_slot(struct active_request_slot *slot)
523 {
524 #ifdef USE_CURL_MULTI
525 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
526 int num_transfers;
527
528 if (curlm_result != CURLM_OK &&
529 curlm_result != CURLM_CALL_MULTI_PERFORM) {
530 active_requests--;
531 slot->in_use = 0;
532 return 0;
533 }
534
535 /*
536 * We know there must be something to do, since we just added
537 * something.
538 */
539 curl_multi_perform(curlm, &num_transfers);
540 #endif
541 return 1;
542 }
543
544 #ifdef USE_CURL_MULTI
545 struct fill_chain {
546 void *data;
547 int (*fill)(void *);
548 struct fill_chain *next;
549 };
550
551 static struct fill_chain *fill_cfg;
552
553 void add_fill_function(void *data, int (*fill)(void *))
554 {
555 struct fill_chain *new = xmalloc(sizeof(*new));
556 struct fill_chain **linkp = &fill_cfg;
557 new->data = data;
558 new->fill = fill;
559 new->next = NULL;
560 while (*linkp)
561 linkp = &(*linkp)->next;
562 *linkp = new;
563 }
564
565 void fill_active_slots(void)
566 {
567 struct active_request_slot *slot = active_queue_head;
568
569 while (active_requests < max_requests) {
570 struct fill_chain *fill;
571 for (fill = fill_cfg; fill; fill = fill->next)
572 if (fill->fill(fill->data))
573 break;
574
575 if (!fill)
576 break;
577 }
578
579 while (slot != NULL) {
580 if (!slot->in_use && slot->curl != NULL
581 && curl_session_count > min_curl_sessions) {
582 curl_easy_cleanup(slot->curl);
583 slot->curl = NULL;
584 curl_session_count--;
585 }
586 slot = slot->next;
587 }
588 }
589
590 void step_active_slots(void)
591 {
592 int num_transfers;
593 CURLMcode curlm_result;
594
595 do {
596 curlm_result = curl_multi_perform(curlm, &num_transfers);
597 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
598 if (num_transfers < active_requests) {
599 process_curl_messages();
600 fill_active_slots();
601 }
602 }
603 #endif
604
605 void run_active_slot(struct active_request_slot *slot)
606 {
607 #ifdef USE_CURL_MULTI
608 long last_pos = 0;
609 long current_pos;
610 fd_set readfds;
611 fd_set writefds;
612 fd_set excfds;
613 int max_fd;
614 struct timeval select_timeout;
615 int finished = 0;
616
617 slot->finished = &finished;
618 while (!finished) {
619 data_received = 0;
620 step_active_slots();
621
622 if (!data_received && slot->local != NULL) {
623 current_pos = ftell(slot->local);
624 if (current_pos > last_pos)
625 data_received++;
626 last_pos = current_pos;
627 }
628
629 if (slot->in_use && !data_received) {
630 max_fd = 0;
631 FD_ZERO(&readfds);
632 FD_ZERO(&writefds);
633 FD_ZERO(&excfds);
634 select_timeout.tv_sec = 0;
635 select_timeout.tv_usec = 50000;
636 select(max_fd, &readfds, &writefds,
637 &excfds, &select_timeout);
638 }
639 }
640 #else
641 while (slot->in_use) {
642 slot->curl_result = curl_easy_perform(slot->curl);
643 finish_active_slot(slot);
644 }
645 #endif
646 }
647
648 static void closedown_active_slot(struct active_request_slot *slot)
649 {
650 active_requests--;
651 slot->in_use = 0;
652 }
653
654 static void release_active_slot(struct active_request_slot *slot)
655 {
656 closedown_active_slot(slot);
657 if (slot->curl && curl_session_count > min_curl_sessions) {
658 #ifdef USE_CURL_MULTI
659 curl_multi_remove_handle(curlm, slot->curl);
660 #endif
661 curl_easy_cleanup(slot->curl);
662 slot->curl = NULL;
663 curl_session_count--;
664 }
665 #ifdef USE_CURL_MULTI
666 fill_active_slots();
667 #endif
668 }
669
670 void finish_active_slot(struct active_request_slot *slot)
671 {
672 closedown_active_slot(slot);
673 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
674
675 if (slot->finished != NULL)
676 (*slot->finished) = 1;
677
678 /* Store slot results so they can be read after the slot is reused */
679 if (slot->results != NULL) {
680 slot->results->curl_result = slot->curl_result;
681 slot->results->http_code = slot->http_code;
682 }
683
684 /* Run callback if appropriate */
685 if (slot->callback_func != NULL)
686 slot->callback_func(slot->callback_data);
687 }
688
689 void finish_all_active_slots(void)
690 {
691 struct active_request_slot *slot = active_queue_head;
692
693 while (slot != NULL)
694 if (slot->in_use) {
695 run_active_slot(slot);
696 slot = active_queue_head;
697 } else {
698 slot = slot->next;
699 }
700 }
701
702 /* Helpers for modifying and creating URLs */
703 static inline int needs_quote(int ch)
704 {
705 if (((ch >= 'A') && (ch <= 'Z'))
706 || ((ch >= 'a') && (ch <= 'z'))
707 || ((ch >= '0') && (ch <= '9'))
708 || (ch == '/')
709 || (ch == '-')
710 || (ch == '.'))
711 return 0;
712 return 1;
713 }
714
715 static inline int hex(int v)
716 {
717 if (v < 10)
718 return '0' + v;
719 else
720 return 'A' + v - 10;
721 }
722
723 static void end_url_with_slash(struct strbuf *buf, const char *url)
724 {
725 strbuf_addstr(buf, url);
726 if (buf->len && buf->buf[buf->len - 1] != '/')
727 strbuf_addstr(buf, "/");
728 }
729
730 static char *quote_ref_url(const char *base, const char *ref)
731 {
732 struct strbuf buf = STRBUF_INIT;
733 const char *cp;
734 int ch;
735
736 end_url_with_slash(&buf, base);
737
738 for (cp = ref; (ch = *cp) != 0; cp++)
739 if (needs_quote(ch))
740 strbuf_addf(&buf, "%%%02x", ch);
741 else
742 strbuf_addch(&buf, *cp);
743
744 return strbuf_detach(&buf, NULL);
745 }
746
747 void append_remote_object_url(struct strbuf *buf, const char *url,
748 const char *hex,
749 int only_two_digit_prefix)
750 {
751 end_url_with_slash(buf, url);
752
753 strbuf_addf(buf, "objects/%.*s/", 2, hex);
754 if (!only_two_digit_prefix)
755 strbuf_addf(buf, "%s", hex+2);
756 }
757
758 char *get_remote_object_url(const char *url, const char *hex,
759 int only_two_digit_prefix)
760 {
761 struct strbuf buf = STRBUF_INIT;
762 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
763 return strbuf_detach(&buf, NULL);
764 }
765
766 /* http_request() targets */
767 #define HTTP_REQUEST_STRBUF 0
768 #define HTTP_REQUEST_FILE 1
769
770 static int http_request(const char *url, void *result, int target, int options)
771 {
772 struct active_request_slot *slot;
773 struct slot_results results;
774 struct curl_slist *headers = NULL;
775 struct strbuf buf = STRBUF_INIT;
776 int ret;
777
778 slot = get_active_slot();
779 slot->results = &results;
780 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
781
782 if (result == NULL) {
783 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
784 } else {
785 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
786 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
787
788 if (target == HTTP_REQUEST_FILE) {
789 long posn = ftell(result);
790 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
791 fwrite);
792 if (posn > 0) {
793 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
794 headers = curl_slist_append(headers, buf.buf);
795 strbuf_reset(&buf);
796 }
797 slot->local = result;
798 } else
799 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
800 fwrite_buffer);
801 }
802
803 strbuf_addstr(&buf, "Pragma:");
804 if (options & HTTP_NO_CACHE)
805 strbuf_addstr(&buf, " no-cache");
806
807 headers = curl_slist_append(headers, buf.buf);
808
809 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
810 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
811
812 if (start_active_slot(slot)) {
813 run_active_slot(slot);
814 if (results.curl_result == CURLE_OK)
815 ret = HTTP_OK;
816 else if (missing_target(&results))
817 ret = HTTP_MISSING_TARGET;
818 else
819 ret = HTTP_ERROR;
820 } else {
821 error("Unable to start HTTP request for %s", url);
822 ret = HTTP_START_FAILED;
823 }
824
825 slot->local = NULL;
826 curl_slist_free_all(headers);
827 strbuf_release(&buf);
828
829 return ret;
830 }
831
832 int http_get_strbuf(const char *url, struct strbuf *result, int options)
833 {
834 return http_request(url, result, HTTP_REQUEST_STRBUF, options);
835 }
836
837 /*
838 * Downloads an url and stores the result in the given file.
839 *
840 * If a previous interrupted download is detected (i.e. a previous temporary
841 * file is still around) the download is resumed.
842 */
843 static int http_get_file(const char *url, const char *filename, int options)
844 {
845 int ret;
846 struct strbuf tmpfile = STRBUF_INIT;
847 FILE *result;
848
849 strbuf_addf(&tmpfile, "%s.temp", filename);
850 result = fopen(tmpfile.buf, "a");
851 if (! result) {
852 error("Unable to open local file %s", tmpfile.buf);
853 ret = HTTP_ERROR;
854 goto cleanup;
855 }
856
857 ret = http_request(url, result, HTTP_REQUEST_FILE, options);
858 fclose(result);
859
860 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
861 ret = HTTP_ERROR;
862 cleanup:
863 strbuf_release(&tmpfile);
864 return ret;
865 }
866
867 int http_error(const char *url, int ret)
868 {
869 /* http_request has already handled HTTP_START_FAILED. */
870 if (ret != HTTP_START_FAILED)
871 error("%s while accessing %s\n", curl_errorstr, url);
872
873 return ret;
874 }
875
876 int http_fetch_ref(const char *base, struct ref *ref)
877 {
878 char *url;
879 struct strbuf buffer = STRBUF_INIT;
880 int ret = -1;
881
882 url = quote_ref_url(base, ref->name);
883 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
884 strbuf_rtrim(&buffer);
885 if (buffer.len == 40)
886 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
887 else if (!prefixcmp(buffer.buf, "ref: ")) {
888 ref->symref = xstrdup(buffer.buf + 5);
889 ret = 0;
890 }
891 }
892
893 strbuf_release(&buffer);
894 free(url);
895 return ret;
896 }
897
898 /* Helpers for fetching packs */
899 static int fetch_pack_index(unsigned char *sha1, const char *base_url)
900 {
901 int ret = 0;
902 char *hex = xstrdup(sha1_to_hex(sha1));
903 char *filename;
904 char *url = NULL;
905 struct strbuf buf = STRBUF_INIT;
906
907 if (has_pack_index(sha1)) {
908 ret = 0;
909 goto cleanup;
910 }
911
912 if (http_is_verbose)
913 fprintf(stderr, "Getting index for pack %s\n", hex);
914
915 end_url_with_slash(&buf, base_url);
916 strbuf_addf(&buf, "objects/pack/pack-%s.idx", hex);
917 url = strbuf_detach(&buf, NULL);
918
919 filename = sha1_pack_index_name(sha1);
920 if (http_get_file(url, filename, 0) != HTTP_OK)
921 ret = error("Unable to get pack index %s\n", url);
922
923 cleanup:
924 free(hex);
925 free(url);
926 return ret;
927 }
928
929 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
930 unsigned char *sha1, const char *base_url)
931 {
932 struct packed_git *new_pack;
933
934 if (fetch_pack_index(sha1, base_url))
935 return -1;
936
937 new_pack = parse_pack_index(sha1);
938 if (!new_pack)
939 return -1; /* parse_pack_index() already issued error message */
940 new_pack->next = *packs_head;
941 *packs_head = new_pack;
942 return 0;
943 }
944
945 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
946 {
947 int ret = 0, i = 0;
948 char *url, *data;
949 struct strbuf buf = STRBUF_INIT;
950 unsigned char sha1[20];
951
952 end_url_with_slash(&buf, base_url);
953 strbuf_addstr(&buf, "objects/info/packs");
954 url = strbuf_detach(&buf, NULL);
955
956 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
957 if (ret != HTTP_OK)
958 goto cleanup;
959
960 data = buf.buf;
961 while (i < buf.len) {
962 switch (data[i]) {
963 case 'P':
964 i++;
965 if (i + 52 <= buf.len &&
966 !prefixcmp(data + i, " pack-") &&
967 !prefixcmp(data + i + 46, ".pack\n")) {
968 get_sha1_hex(data + i + 6, sha1);
969 fetch_and_setup_pack_index(packs_head, sha1,
970 base_url);
971 i += 51;
972 break;
973 }
974 default:
975 while (i < buf.len && data[i] != '\n')
976 i++;
977 }
978 i++;
979 }
980
981 cleanup:
982 free(url);
983 return ret;
984 }
985
986 void release_http_pack_request(struct http_pack_request *preq)
987 {
988 if (preq->packfile != NULL) {
989 fclose(preq->packfile);
990 preq->packfile = NULL;
991 preq->slot->local = NULL;
992 }
993 if (preq->range_header != NULL) {
994 curl_slist_free_all(preq->range_header);
995 preq->range_header = NULL;
996 }
997 preq->slot = NULL;
998 free(preq->url);
999 }
1000
1001 int finish_http_pack_request(struct http_pack_request *preq)
1002 {
1003 int ret;
1004 struct packed_git **lst;
1005
1006 preq->target->pack_size = ftell(preq->packfile);
1007
1008 if (preq->packfile != NULL) {
1009 fclose(preq->packfile);
1010 preq->packfile = NULL;
1011 preq->slot->local = NULL;
1012 }
1013
1014 ret = move_temp_to_file(preq->tmpfile, preq->filename);
1015 if (ret)
1016 return ret;
1017
1018 lst = preq->lst;
1019 while (*lst != preq->target)
1020 lst = &((*lst)->next);
1021 *lst = (*lst)->next;
1022
1023 if (verify_pack(preq->target))
1024 return -1;
1025 install_packed_git(preq->target);
1026
1027 return 0;
1028 }
1029
1030 struct http_pack_request *new_http_pack_request(
1031 struct packed_git *target, const char *base_url)
1032 {
1033 char *filename;
1034 long prev_posn = 0;
1035 char range[RANGE_HEADER_SIZE];
1036 struct strbuf buf = STRBUF_INIT;
1037 struct http_pack_request *preq;
1038
1039 preq = xmalloc(sizeof(*preq));
1040 preq->target = target;
1041 preq->range_header = NULL;
1042
1043 end_url_with_slash(&buf, base_url);
1044 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1045 sha1_to_hex(target->sha1));
1046 preq->url = strbuf_detach(&buf, NULL);
1047
1048 filename = sha1_pack_name(target->sha1);
1049 snprintf(preq->filename, sizeof(preq->filename), "%s", filename);
1050 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp", filename);
1051 preq->packfile = fopen(preq->tmpfile, "a");
1052 if (!preq->packfile) {
1053 error("Unable to open local file %s for pack",
1054 preq->tmpfile);
1055 goto abort;
1056 }
1057
1058 preq->slot = get_active_slot();
1059 preq->slot->local = preq->packfile;
1060 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1061 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1062 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1063 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1064 no_pragma_header);
1065
1066 /*
1067 * If there is data present from a previous transfer attempt,
1068 * resume where it left off
1069 */
1070 prev_posn = ftell(preq->packfile);
1071 if (prev_posn>0) {
1072 if (http_is_verbose)
1073 fprintf(stderr,
1074 "Resuming fetch of pack %s at byte %ld\n",
1075 sha1_to_hex(target->sha1), prev_posn);
1076 sprintf(range, "Range: bytes=%ld-", prev_posn);
1077 preq->range_header = curl_slist_append(NULL, range);
1078 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1079 preq->range_header);
1080 }
1081
1082 return preq;
1083
1084 abort:
1085 free(filename);
1086 free(preq->url);
1087 free(preq);
1088 return NULL;
1089 }
1090
1091 /* Helpers for fetching objects (loose) */
1092 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
1093 void *data)
1094 {
1095 unsigned char expn[4096];
1096 size_t size = eltsize * nmemb;
1097 int posn = 0;
1098 struct http_object_request *freq =
1099 (struct http_object_request *)data;
1100 do {
1101 ssize_t retval = xwrite(freq->localfile,
1102 (char *) ptr + posn, size - posn);
1103 if (retval < 0)
1104 return posn;
1105 posn += retval;
1106 } while (posn < size);
1107
1108 freq->stream.avail_in = size;
1109 freq->stream.next_in = ptr;
1110 do {
1111 freq->stream.next_out = expn;
1112 freq->stream.avail_out = sizeof(expn);
1113 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1114 git_SHA1_Update(&freq->c, expn,
1115 sizeof(expn) - freq->stream.avail_out);
1116 } while (freq->stream.avail_in && freq->zret == Z_OK);
1117 data_received++;
1118 return size;
1119 }
1120
1121 struct http_object_request *new_http_object_request(const char *base_url,
1122 unsigned char *sha1)
1123 {
1124 char *hex = sha1_to_hex(sha1);
1125 char *filename;
1126 char prevfile[PATH_MAX];
1127 int prevlocal;
1128 unsigned char prev_buf[PREV_BUF_SIZE];
1129 ssize_t prev_read = 0;
1130 long prev_posn = 0;
1131 char range[RANGE_HEADER_SIZE];
1132 struct curl_slist *range_header = NULL;
1133 struct http_object_request *freq;
1134
1135 freq = xmalloc(sizeof(*freq));
1136 hashcpy(freq->sha1, sha1);
1137 freq->localfile = -1;
1138
1139 filename = sha1_file_name(sha1);
1140 snprintf(freq->filename, sizeof(freq->filename), "%s", filename);
1141 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1142 "%s.temp", filename);
1143
1144 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1145 unlink_or_warn(prevfile);
1146 rename(freq->tmpfile, prevfile);
1147 unlink_or_warn(freq->tmpfile);
1148
1149 if (freq->localfile != -1)
1150 error("fd leakage in start: %d", freq->localfile);
1151 freq->localfile = open(freq->tmpfile,
1152 O_WRONLY | O_CREAT | O_EXCL, 0666);
1153 /*
1154 * This could have failed due to the "lazy directory creation";
1155 * try to mkdir the last path component.
1156 */
1157 if (freq->localfile < 0 && errno == ENOENT) {
1158 char *dir = strrchr(freq->tmpfile, '/');
1159 if (dir) {
1160 *dir = 0;
1161 mkdir(freq->tmpfile, 0777);
1162 *dir = '/';
1163 }
1164 freq->localfile = open(freq->tmpfile,
1165 O_WRONLY | O_CREAT | O_EXCL, 0666);
1166 }
1167
1168 if (freq->localfile < 0) {
1169 error("Couldn't create temporary file %s for %s: %s",
1170 freq->tmpfile, freq->filename, strerror(errno));
1171 goto abort;
1172 }
1173
1174 memset(&freq->stream, 0, sizeof(freq->stream));
1175
1176 git_inflate_init(&freq->stream);
1177
1178 git_SHA1_Init(&freq->c);
1179
1180 freq->url = get_remote_object_url(base_url, hex, 0);
1181
1182 /*
1183 * If a previous temp file is present, process what was already
1184 * fetched.
1185 */
1186 prevlocal = open(prevfile, O_RDONLY);
1187 if (prevlocal != -1) {
1188 do {
1189 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1190 if (prev_read>0) {
1191 if (fwrite_sha1_file(prev_buf,
1192 1,
1193 prev_read,
1194 freq) == prev_read) {
1195 prev_posn += prev_read;
1196 } else {
1197 prev_read = -1;
1198 }
1199 }
1200 } while (prev_read > 0);
1201 close(prevlocal);
1202 }
1203 unlink_or_warn(prevfile);
1204
1205 /*
1206 * Reset inflate/SHA1 if there was an error reading the previous temp
1207 * file; also rewind to the beginning of the local file.
1208 */
1209 if (prev_read == -1) {
1210 memset(&freq->stream, 0, sizeof(freq->stream));
1211 git_inflate_init(&freq->stream);
1212 git_SHA1_Init(&freq->c);
1213 if (prev_posn>0) {
1214 prev_posn = 0;
1215 lseek(freq->localfile, 0, SEEK_SET);
1216 if (ftruncate(freq->localfile, 0) < 0) {
1217 error("Couldn't truncate temporary file %s for %s: %s",
1218 freq->tmpfile, freq->filename, strerror(errno));
1219 goto abort;
1220 }
1221 }
1222 }
1223
1224 freq->slot = get_active_slot();
1225
1226 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1227 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1228 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1229 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1230 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1231
1232 /*
1233 * If we have successfully processed data from a previous fetch
1234 * attempt, only fetch the data we don't already have.
1235 */
1236 if (prev_posn>0) {
1237 if (http_is_verbose)
1238 fprintf(stderr,
1239 "Resuming fetch of object %s at byte %ld\n",
1240 hex, prev_posn);
1241 sprintf(range, "Range: bytes=%ld-", prev_posn);
1242 range_header = curl_slist_append(range_header, range);
1243 curl_easy_setopt(freq->slot->curl,
1244 CURLOPT_HTTPHEADER, range_header);
1245 }
1246
1247 return freq;
1248
1249 abort:
1250 free(filename);
1251 free(freq->url);
1252 free(freq);
1253 return NULL;
1254 }
1255
1256 void process_http_object_request(struct http_object_request *freq)
1257 {
1258 if (freq->slot == NULL)
1259 return;
1260 freq->curl_result = freq->slot->curl_result;
1261 freq->http_code = freq->slot->http_code;
1262 freq->slot = NULL;
1263 }
1264
1265 int finish_http_object_request(struct http_object_request *freq)
1266 {
1267 struct stat st;
1268
1269 close(freq->localfile);
1270 freq->localfile = -1;
1271
1272 process_http_object_request(freq);
1273
1274 if (freq->http_code == 416) {
1275 warning("requested range invalid; we may already have all the data.");
1276 } else if (freq->curl_result != CURLE_OK) {
1277 if (stat(freq->tmpfile, &st) == 0)
1278 if (st.st_size == 0)
1279 unlink_or_warn(freq->tmpfile);
1280 return -1;
1281 }
1282
1283 git_inflate_end(&freq->stream);
1284 git_SHA1_Final(freq->real_sha1, &freq->c);
1285 if (freq->zret != Z_STREAM_END) {
1286 unlink_or_warn(freq->tmpfile);
1287 return -1;
1288 }
1289 if (hashcmp(freq->sha1, freq->real_sha1)) {
1290 unlink_or_warn(freq->tmpfile);
1291 return -1;
1292 }
1293 freq->rename =
1294 move_temp_to_file(freq->tmpfile, freq->filename);
1295
1296 return freq->rename;
1297 }
1298
1299 void abort_http_object_request(struct http_object_request *freq)
1300 {
1301 unlink_or_warn(freq->tmpfile);
1302
1303 release_http_object_request(freq);
1304 }
1305
1306 void release_http_object_request(struct http_object_request *freq)
1307 {
1308 if (freq->localfile != -1) {
1309 close(freq->localfile);
1310 freq->localfile = -1;
1311 }
1312 if (freq->url != NULL) {
1313 free(freq->url);
1314 freq->url = NULL;
1315 }
1316 if (freq->slot != NULL) {
1317 freq->slot->callback_func = NULL;
1318 freq->slot->callback_data = NULL;
1319 release_active_slot(freq->slot);
1320 freq->slot = NULL;
1321 }
1322 }
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