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http: maintain curl sessions
[git/jnareb-git/bp-gitweb.git] / http.c
blobfb0a97b3f9a49da1d21330cb35054698109a695f
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 static int min_curl_sessions = 1;
11 static int curl_session_count;
12 #ifdef USE_CURL_MULTI
13 static int max_requests = -1;
14 static CURLM *curlm;
15 #endif
16 #ifndef NO_CURL_EASY_DUPHANDLE
17 static CURL *curl_default;
18 #endif
19
20 #define PREV_BUF_SIZE 4096
21 #define RANGE_HEADER_SIZE 30
22
23 char curl_errorstr[CURL_ERROR_SIZE];
24
25 static int curl_ssl_verify = -1;
26 static const char *ssl_cert;
27 #if LIBCURL_VERSION_NUM >= 0x070903
28 static const char *ssl_key;
29 #endif
30 #if LIBCURL_VERSION_NUM >= 0x070908
31 static const char *ssl_capath;
32 #endif
33 static const char *ssl_cainfo;
34 static long curl_low_speed_limit = -1;
35 static long curl_low_speed_time = -1;
36 static int curl_ftp_no_epsv;
37 static const char *curl_http_proxy;
38 static char *user_name, *user_pass;
39
40 #if LIBCURL_VERSION_NUM >= 0x071700
41 /* Use CURLOPT_KEYPASSWD as is */
42 #elif LIBCURL_VERSION_NUM >= 0x070903
43 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
44 #else
45 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
46 #endif
47
48 static char *ssl_cert_password;
49 static int ssl_cert_password_required;
50
51 static struct curl_slist *pragma_header;
52 static struct curl_slist *no_pragma_header;
53
54 static struct active_request_slot *active_queue_head;
55
56 size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
57 {
58 size_t size = eltsize * nmemb;
59 struct buffer *buffer = buffer_;
60
61 if (size > buffer->buf.len - buffer->posn)
62 size = buffer->buf.len - buffer->posn;
63 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
64 buffer->posn += size;
65
66 return size;
67 }
68
69 #ifndef NO_CURL_IOCTL
70 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
71 {
72 struct buffer *buffer = clientp;
73
74 switch (cmd) {
75 case CURLIOCMD_NOP:
76 return CURLIOE_OK;
77
78 case CURLIOCMD_RESTARTREAD:
79 buffer->posn = 0;
80 return CURLIOE_OK;
81
82 default:
83 return CURLIOE_UNKNOWNCMD;
84 }
85 }
86 #endif
87
88 size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
89 {
90 size_t size = eltsize * nmemb;
91 struct strbuf *buffer = buffer_;
92
93 strbuf_add(buffer, ptr, size);
94 data_received++;
95 return size;
96 }
97
98 size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
99 {
100 data_received++;
101 return eltsize * nmemb;
102 }
103
104 #ifdef USE_CURL_MULTI
105 static void process_curl_messages(void)
106 {
107 int num_messages;
108 struct active_request_slot *slot;
109 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
110
111 while (curl_message != NULL) {
112 if (curl_message->msg == CURLMSG_DONE) {
113 int curl_result = curl_message->data.result;
114 slot = active_queue_head;
115 while (slot != NULL &&
116 slot->curl != curl_message->easy_handle)
117 slot = slot->next;
118 if (slot != NULL) {
119 curl_multi_remove_handle(curlm, slot->curl);
120 slot->curl_result = curl_result;
121 finish_active_slot(slot);
122 } else {
123 fprintf(stderr, "Received DONE message for unknown request!\n");
124 }
125 } else {
126 fprintf(stderr, "Unknown CURL message received: %d\n",
127 (int)curl_message->msg);
128 }
129 curl_message = curl_multi_info_read(curlm, &num_messages);
130 }
131 }
132 #endif
133
134 static int http_options(const char *var, const char *value, void *cb)
135 {
136 if (!strcmp("http.sslverify", var)) {
137 curl_ssl_verify = git_config_bool(var, value);
138 return 0;
139 }
140 if (!strcmp("http.sslcert", var))
141 return git_config_string(&ssl_cert, var, value);
142 #if LIBCURL_VERSION_NUM >= 0x070903
143 if (!strcmp("http.sslkey", var))
144 return git_config_string(&ssl_key, var, value);
145 #endif
146 #if LIBCURL_VERSION_NUM >= 0x070908
147 if (!strcmp("http.sslcapath", var))
148 return git_config_string(&ssl_capath, var, value);
149 #endif
150 if (!strcmp("http.sslcainfo", var))
151 return git_config_string(&ssl_cainfo, var, value);
152 if (!strcmp("http.sslcertpasswordprotected", var)) {
153 if (git_config_bool(var, value))
154 ssl_cert_password_required = 1;
155 return 0;
156 }
157 if (!strcmp("http.minsessions", var)) {
158 min_curl_sessions = git_config_int(var, value);
159 #ifndef USE_CURL_MULTI
160 if (min_curl_sessions > 1)
161 min_curl_sessions = 1;
162 #endif
163 return 0;
164 }
165 #ifdef USE_CURL_MULTI
166 if (!strcmp("http.maxrequests", var)) {
167 max_requests = git_config_int(var, value);
168 return 0;
169 }
170 #endif
171 if (!strcmp("http.lowspeedlimit", var)) {
172 curl_low_speed_limit = (long)git_config_int(var, value);
173 return 0;
174 }
175 if (!strcmp("http.lowspeedtime", var)) {
176 curl_low_speed_time = (long)git_config_int(var, value);
177 return 0;
178 }
179
180 if (!strcmp("http.noepsv", var)) {
181 curl_ftp_no_epsv = git_config_bool(var, value);
182 return 0;
183 }
184 if (!strcmp("http.proxy", var))
185 return git_config_string(&curl_http_proxy, var, value);
186
187 if (!strcmp("http.postbuffer", var)) {
188 http_post_buffer = git_config_int(var, value);
189 if (http_post_buffer < LARGE_PACKET_MAX)
190 http_post_buffer = LARGE_PACKET_MAX;
191 return 0;
192 }
193
194 /* Fall back on the default ones */
195 return git_default_config(var, value, cb);
196 }
197
198 static void init_curl_http_auth(CURL *result)
199 {
200 if (user_name) {
201 struct strbuf up = STRBUF_INIT;
202 if (!user_pass)
203 user_pass = xstrdup(getpass("Password: "));
204 strbuf_addf(&up, "%s:%s", user_name, user_pass);
205 curl_easy_setopt(result, CURLOPT_USERPWD,
206 strbuf_detach(&up, NULL));
207 }
208 }
209
210 static int has_cert_password(void)
211 {
212 if (ssl_cert_password != NULL)
213 return 1;
214 if (ssl_cert == NULL || ssl_cert_password_required != 1)
215 return 0;
216 /* Only prompt the user once. */
217 ssl_cert_password_required = -1;
218 ssl_cert_password = getpass("Certificate Password: ");
219 if (ssl_cert_password != NULL) {
220 ssl_cert_password = xstrdup(ssl_cert_password);
221 return 1;
222 } else
223 return 0;
224 }
225
226 static CURL *get_curl_handle(void)
227 {
228 CURL *result = curl_easy_init();
229
230 if (!curl_ssl_verify) {
231 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
232 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
233 } else {
234 /* Verify authenticity of the peer's certificate */
235 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
236 /* The name in the cert must match whom we tried to connect */
237 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
238 }
239
240 #if LIBCURL_VERSION_NUM >= 0x070907
241 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
242 #endif
243
244 init_curl_http_auth(result);
245
246 if (ssl_cert != NULL)
247 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
248 if (has_cert_password())
249 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
250 #if LIBCURL_VERSION_NUM >= 0x070903
251 if (ssl_key != NULL)
252 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
253 #endif
254 #if LIBCURL_VERSION_NUM >= 0x070908
255 if (ssl_capath != NULL)
256 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
257 #endif
258 if (ssl_cainfo != NULL)
259 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
260 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
261
262 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
263 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
264 curl_low_speed_limit);
265 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
266 curl_low_speed_time);
267 }
268
269 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
270
271 if (getenv("GIT_CURL_VERBOSE"))
272 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
273
274 curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
275
276 if (curl_ftp_no_epsv)
277 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
278
279 if (curl_http_proxy)
280 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
281
282 return result;
283 }
284
285 static void http_auth_init(const char *url)
286 {
287 char *at, *colon, *cp, *slash;
288 int len;
289
290 cp = strstr(url, "://");
291 if (!cp)
292 return;
293
294 /*
295 * Ok, the URL looks like "proto://something". Which one?
296 * "proto://<user>:<pass>@<host>/...",
297 * "proto://<user>@<host>/...", or just
298 * "proto://<host>/..."?
299 */
300 cp += 3;
301 at = strchr(cp, '@');
302 colon = strchr(cp, ':');
303 slash = strchrnul(cp, '/');
304 if (!at || slash <= at)
305 return; /* No credentials */
306 if (!colon || at <= colon) {
307 /* Only username */
308 len = at - cp;
309 user_name = xmalloc(len + 1);
310 memcpy(user_name, cp, len);
311 user_name[len] = '\0';
312 user_pass = NULL;
313 } else {
314 len = colon - cp;
315 user_name = xmalloc(len + 1);
316 memcpy(user_name, cp, len);
317 user_name[len] = '\0';
318 len = at - (colon + 1);
319 user_pass = xmalloc(len + 1);
320 memcpy(user_pass, colon + 1, len);
321 user_pass[len] = '\0';
322 }
323 }
324
325 static void set_from_env(const char **var, const char *envname)
326 {
327 const char *val = getenv(envname);
328 if (val)
329 *var = val;
330 }
331
332 void http_init(struct remote *remote)
333 {
334 char *low_speed_limit;
335 char *low_speed_time;
336
337 http_is_verbose = 0;
338
339 git_config(http_options, NULL);
340
341 curl_global_init(CURL_GLOBAL_ALL);
342
343 if (remote && remote->http_proxy)
344 curl_http_proxy = xstrdup(remote->http_proxy);
345
346 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
347 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
348
349 #ifdef USE_CURL_MULTI
350 {
351 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
352 if (http_max_requests != NULL)
353 max_requests = atoi(http_max_requests);
354 }
355
356 curlm = curl_multi_init();
357 if (curlm == NULL) {
358 fprintf(stderr, "Error creating curl multi handle.\n");
359 exit(1);
360 }
361 #endif
362
363 if (getenv("GIT_SSL_NO_VERIFY"))
364 curl_ssl_verify = 0;
365
366 set_from_env(&ssl_cert, "GIT_SSL_CERT");
367 #if LIBCURL_VERSION_NUM >= 0x070903
368 set_from_env(&ssl_key, "GIT_SSL_KEY");
369 #endif
370 #if LIBCURL_VERSION_NUM >= 0x070908
371 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
372 #endif
373 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
374
375 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
376 if (low_speed_limit != NULL)
377 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
378 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
379 if (low_speed_time != NULL)
380 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
381
382 if (curl_ssl_verify == -1)
383 curl_ssl_verify = 1;
384
385 curl_session_count = 0;
386 #ifdef USE_CURL_MULTI
387 if (max_requests < 1)
388 max_requests = DEFAULT_MAX_REQUESTS;
389 #endif
390
391 if (getenv("GIT_CURL_FTP_NO_EPSV"))
392 curl_ftp_no_epsv = 1;
393
394 if (remote && remote->url && remote->url[0]) {
395 http_auth_init(remote->url[0]);
396 if (!ssl_cert_password_required &&
397 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
398 !prefixcmp(remote->url[0], "https://"))
399 ssl_cert_password_required = 1;
400 }
401
402 #ifndef NO_CURL_EASY_DUPHANDLE
403 curl_default = get_curl_handle();
404 #endif
405 }
406
407 void http_cleanup(void)
408 {
409 struct active_request_slot *slot = active_queue_head;
410
411 while (slot != NULL) {
412 struct active_request_slot *next = slot->next;
413 if (slot->curl != NULL) {
414 #ifdef USE_CURL_MULTI
415 curl_multi_remove_handle(curlm, slot->curl);
416 #endif
417 curl_easy_cleanup(slot->curl);
418 }
419 free(slot);
420 slot = next;
421 }
422 active_queue_head = NULL;
423
424 #ifndef NO_CURL_EASY_DUPHANDLE
425 curl_easy_cleanup(curl_default);
426 #endif
427
428 #ifdef USE_CURL_MULTI
429 curl_multi_cleanup(curlm);
430 #endif
431 curl_global_cleanup();
432
433 curl_slist_free_all(pragma_header);
434 pragma_header = NULL;
435
436 curl_slist_free_all(no_pragma_header);
437 no_pragma_header = NULL;
438
439 if (curl_http_proxy) {
440 free((void *)curl_http_proxy);
441 curl_http_proxy = NULL;
442 }
443
444 if (ssl_cert_password != NULL) {
445 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
446 free(ssl_cert_password);
447 ssl_cert_password = NULL;
448 }
449 ssl_cert_password_required = 0;
450 }
451
452 struct active_request_slot *get_active_slot(void)
453 {
454 struct active_request_slot *slot = active_queue_head;
455 struct active_request_slot *newslot;
456
457 #ifdef USE_CURL_MULTI
458 int num_transfers;
459
460 /* Wait for a slot to open up if the queue is full */
461 while (active_requests >= max_requests) {
462 curl_multi_perform(curlm, &num_transfers);
463 if (num_transfers < active_requests)
464 process_curl_messages();
465 }
466 #endif
467
468 while (slot != NULL && slot->in_use)
469 slot = slot->next;
470
471 if (slot == NULL) {
472 newslot = xmalloc(sizeof(*newslot));
473 newslot->curl = NULL;
474 newslot->in_use = 0;
475 newslot->next = NULL;
476
477 slot = active_queue_head;
478 if (slot == NULL) {
479 active_queue_head = newslot;
480 } else {
481 while (slot->next != NULL)
482 slot = slot->next;
483 slot->next = newslot;
484 }
485 slot = newslot;
486 }
487
488 if (slot->curl == NULL) {
489 #ifdef NO_CURL_EASY_DUPHANDLE
490 slot->curl = get_curl_handle();
491 #else
492 slot->curl = curl_easy_duphandle(curl_default);
493 #endif
494 curl_session_count++;
495 }
496
497 active_requests++;
498 slot->in_use = 1;
499 slot->local = NULL;
500 slot->results = NULL;
501 slot->finished = NULL;
502 slot->callback_data = NULL;
503 slot->callback_func = NULL;
504 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
505 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
506 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
507 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
508 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
509 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
510 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
511
512 return slot;
513 }
514
515 int start_active_slot(struct active_request_slot *slot)
516 {
517 #ifdef USE_CURL_MULTI
518 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
519 int num_transfers;
520
521 if (curlm_result != CURLM_OK &&
522 curlm_result != CURLM_CALL_MULTI_PERFORM) {
523 active_requests--;
524 slot->in_use = 0;
525 return 0;
526 }
527
528 /*
529 * We know there must be something to do, since we just added
530 * something.
531 */
532 curl_multi_perform(curlm, &num_transfers);
533 #endif
534 return 1;
535 }
536
537 #ifdef USE_CURL_MULTI
538 struct fill_chain {
539 void *data;
540 int (*fill)(void *);
541 struct fill_chain *next;
542 };
543
544 static struct fill_chain *fill_cfg;
545
546 void add_fill_function(void *data, int (*fill)(void *))
547 {
548 struct fill_chain *new = xmalloc(sizeof(*new));
549 struct fill_chain **linkp = &fill_cfg;
550 new->data = data;
551 new->fill = fill;
552 new->next = NULL;
553 while (*linkp)
554 linkp = &(*linkp)->next;
555 *linkp = new;
556 }
557
558 void fill_active_slots(void)
559 {
560 struct active_request_slot *slot = active_queue_head;
561
562 while (active_requests < max_requests) {
563 struct fill_chain *fill;
564 for (fill = fill_cfg; fill; fill = fill->next)
565 if (fill->fill(fill->data))
566 break;
567
568 if (!fill)
569 break;
570 }
571
572 while (slot != NULL) {
573 if (!slot->in_use && slot->curl != NULL
574 && curl_session_count > min_curl_sessions) {
575 curl_easy_cleanup(slot->curl);
576 slot->curl = NULL;
577 curl_session_count--;
578 }
579 slot = slot->next;
580 }
581 }
582
583 void step_active_slots(void)
584 {
585 int num_transfers;
586 CURLMcode curlm_result;
587
588 do {
589 curlm_result = curl_multi_perform(curlm, &num_transfers);
590 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
591 if (num_transfers < active_requests) {
592 process_curl_messages();
593 fill_active_slots();
594 }
595 }
596 #endif
597
598 void run_active_slot(struct active_request_slot *slot)
599 {
600 #ifdef USE_CURL_MULTI
601 long last_pos = 0;
602 long current_pos;
603 fd_set readfds;
604 fd_set writefds;
605 fd_set excfds;
606 int max_fd;
607 struct timeval select_timeout;
608 int finished = 0;
609
610 slot->finished = &finished;
611 while (!finished) {
612 data_received = 0;
613 step_active_slots();
614
615 if (!data_received && slot->local != NULL) {
616 current_pos = ftell(slot->local);
617 if (current_pos > last_pos)
618 data_received++;
619 last_pos = current_pos;
620 }
621
622 if (slot->in_use && !data_received) {
623 max_fd = 0;
624 FD_ZERO(&readfds);
625 FD_ZERO(&writefds);
626 FD_ZERO(&excfds);
627 select_timeout.tv_sec = 0;
628 select_timeout.tv_usec = 50000;
629 select(max_fd, &readfds, &writefds,
630 &excfds, &select_timeout);
631 }
632 }
633 #else
634 while (slot->in_use) {
635 slot->curl_result = curl_easy_perform(slot->curl);
636 finish_active_slot(slot);
637 }
638 #endif
639 }
640
641 static void closedown_active_slot(struct active_request_slot *slot)
642 {
643 active_requests--;
644 slot->in_use = 0;
645 }
646
647 void release_active_slot(struct active_request_slot *slot)
648 {
649 closedown_active_slot(slot);
650 if (slot->curl && curl_session_count > min_curl_sessions) {
651 #ifdef USE_CURL_MULTI
652 curl_multi_remove_handle(curlm, slot->curl);
653 #endif
654 curl_easy_cleanup(slot->curl);
655 slot->curl = NULL;
656 curl_session_count--;
657 }
658 #ifdef USE_CURL_MULTI
659 fill_active_slots();
660 #endif
661 }
662
663 void finish_active_slot(struct active_request_slot *slot)
664 {
665 closedown_active_slot(slot);
666 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
667
668 if (slot->finished != NULL)
669 (*slot->finished) = 1;
670
671 /* Store slot results so they can be read after the slot is reused */
672 if (slot->results != NULL) {
673 slot->results->curl_result = slot->curl_result;
674 slot->results->http_code = slot->http_code;
675 }
676
677 /* Run callback if appropriate */
678 if (slot->callback_func != NULL)
679 slot->callback_func(slot->callback_data);
680 }
681
682 void finish_all_active_slots(void)
683 {
684 struct active_request_slot *slot = active_queue_head;
685
686 while (slot != NULL)
687 if (slot->in_use) {
688 run_active_slot(slot);
689 slot = active_queue_head;
690 } else {
691 slot = slot->next;
692 }
693 }
694
695 /* Helpers for modifying and creating URLs */
696 static inline int needs_quote(int ch)
697 {
698 if (((ch >= 'A') && (ch <= 'Z'))
699 || ((ch >= 'a') && (ch <= 'z'))
700 || ((ch >= '0') && (ch <= '9'))
701 || (ch == '/')
702 || (ch == '-')
703 || (ch == '.'))
704 return 0;
705 return 1;
706 }
707
708 static inline int hex(int v)
709 {
710 if (v < 10)
711 return '0' + v;
712 else
713 return 'A' + v - 10;
714 }
715
716 static void end_url_with_slash(struct strbuf *buf, const char *url)
717 {
718 strbuf_addstr(buf, url);
719 if (buf->len && buf->buf[buf->len - 1] != '/')
720 strbuf_addstr(buf, "/");
721 }
722
723 static char *quote_ref_url(const char *base, const char *ref)
724 {
725 struct strbuf buf = STRBUF_INIT;
726 const char *cp;
727 int ch;
728
729 end_url_with_slash(&buf, base);
730
731 for (cp = ref; (ch = *cp) != 0; cp++)
732 if (needs_quote(ch))
733 strbuf_addf(&buf, "%%%02x", ch);
734 else
735 strbuf_addch(&buf, *cp);
736
737 return strbuf_detach(&buf, NULL);
738 }
739
740 void append_remote_object_url(struct strbuf *buf, const char *url,
741 const char *hex,
742 int only_two_digit_prefix)
743 {
744 end_url_with_slash(buf, url);
745
746 strbuf_addf(buf, "objects/%.*s/", 2, hex);
747 if (!only_two_digit_prefix)
748 strbuf_addf(buf, "%s", hex+2);
749 }
750
751 char *get_remote_object_url(const char *url, const char *hex,
752 int only_two_digit_prefix)
753 {
754 struct strbuf buf = STRBUF_INIT;
755 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
756 return strbuf_detach(&buf, NULL);
757 }
758
759 /* http_request() targets */
760 #define HTTP_REQUEST_STRBUF 0
761 #define HTTP_REQUEST_FILE 1
762
763 static int http_request(const char *url, void *result, int target, int options)
764 {
765 struct active_request_slot *slot;
766 struct slot_results results;
767 struct curl_slist *headers = NULL;
768 struct strbuf buf = STRBUF_INIT;
769 int ret;
770
771 slot = get_active_slot();
772 slot->results = &results;
773 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
774
775 if (result == NULL) {
776 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
777 } else {
778 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
779 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
780
781 if (target == HTTP_REQUEST_FILE) {
782 long posn = ftell(result);
783 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
784 fwrite);
785 if (posn > 0) {
786 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
787 headers = curl_slist_append(headers, buf.buf);
788 strbuf_reset(&buf);
789 }
790 slot->local = result;
791 } else
792 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
793 fwrite_buffer);
794 }
795
796 strbuf_addstr(&buf, "Pragma:");
797 if (options & HTTP_NO_CACHE)
798 strbuf_addstr(&buf, " no-cache");
799
800 headers = curl_slist_append(headers, buf.buf);
801
802 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
803 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
804
805 if (start_active_slot(slot)) {
806 run_active_slot(slot);
807 if (results.curl_result == CURLE_OK)
808 ret = HTTP_OK;
809 else if (missing_target(&results))
810 ret = HTTP_MISSING_TARGET;
811 else
812 ret = HTTP_ERROR;
813 } else {
814 error("Unable to start HTTP request for %s", url);
815 ret = HTTP_START_FAILED;
816 }
817
818 slot->local = NULL;
819 curl_slist_free_all(headers);
820 strbuf_release(&buf);
821
822 return ret;
823 }
824
825 int http_get_strbuf(const char *url, struct strbuf *result, int options)
826 {
827 return http_request(url, result, HTTP_REQUEST_STRBUF, options);
828 }
829
830 int http_get_file(const char *url, const char *filename, int options)
831 {
832 int ret;
833 struct strbuf tmpfile = STRBUF_INIT;
834 FILE *result;
835
836 strbuf_addf(&tmpfile, "%s.temp", filename);
837 result = fopen(tmpfile.buf, "a");
838 if (! result) {
839 error("Unable to open local file %s", tmpfile.buf);
840 ret = HTTP_ERROR;
841 goto cleanup;
842 }
843
844 ret = http_request(url, result, HTTP_REQUEST_FILE, options);
845 fclose(result);
846
847 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
848 ret = HTTP_ERROR;
849 cleanup:
850 strbuf_release(&tmpfile);
851 return ret;
852 }
853
854 int http_error(const char *url, int ret)
855 {
856 /* http_request has already handled HTTP_START_FAILED. */
857 if (ret != HTTP_START_FAILED)
858 error("%s while accessing %s\n", curl_errorstr, url);
859
860 return ret;
861 }
862
863 int http_fetch_ref(const char *base, struct ref *ref)
864 {
865 char *url;
866 struct strbuf buffer = STRBUF_INIT;
867 int ret = -1;
868
869 url = quote_ref_url(base, ref->name);
870 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
871 strbuf_rtrim(&buffer);
872 if (buffer.len == 40)
873 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
874 else if (!prefixcmp(buffer.buf, "ref: ")) {
875 ref->symref = xstrdup(buffer.buf + 5);
876 ret = 0;
877 }
878 }
879
880 strbuf_release(&buffer);
881 free(url);
882 return ret;
883 }
884
885 /* Helpers for fetching packs */
886 static int fetch_pack_index(unsigned char *sha1, const char *base_url)
887 {
888 int ret = 0;
889 char *hex = xstrdup(sha1_to_hex(sha1));
890 char *filename;
891 char *url = NULL;
892 struct strbuf buf = STRBUF_INIT;
893
894 if (has_pack_index(sha1)) {
895 ret = 0;
896 goto cleanup;
897 }
898
899 if (http_is_verbose)
900 fprintf(stderr, "Getting index for pack %s\n", hex);
901
902 end_url_with_slash(&buf, base_url);
903 strbuf_addf(&buf, "objects/pack/pack-%s.idx", hex);
904 url = strbuf_detach(&buf, NULL);
905
906 filename = sha1_pack_index_name(sha1);
907 if (http_get_file(url, filename, 0) != HTTP_OK)
908 ret = error("Unable to get pack index %s\n", url);
909
910 cleanup:
911 free(hex);
912 free(url);
913 return ret;
914 }
915
916 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
917 unsigned char *sha1, const char *base_url)
918 {
919 struct packed_git *new_pack;
920
921 if (fetch_pack_index(sha1, base_url))
922 return -1;
923
924 new_pack = parse_pack_index(sha1);
925 if (!new_pack)
926 return -1; /* parse_pack_index() already issued error message */
927 new_pack->next = *packs_head;
928 *packs_head = new_pack;
929 return 0;
930 }
931
932 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
933 {
934 int ret = 0, i = 0;
935 char *url, *data;
936 struct strbuf buf = STRBUF_INIT;
937 unsigned char sha1[20];
938
939 end_url_with_slash(&buf, base_url);
940 strbuf_addstr(&buf, "objects/info/packs");
941 url = strbuf_detach(&buf, NULL);
942
943 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
944 if (ret != HTTP_OK)
945 goto cleanup;
946
947 data = buf.buf;
948 while (i < buf.len) {
949 switch (data[i]) {
950 case 'P':
951 i++;
952 if (i + 52 <= buf.len &&
953 !prefixcmp(data + i, " pack-") &&
954 !prefixcmp(data + i + 46, ".pack\n")) {
955 get_sha1_hex(data + i + 6, sha1);
956 fetch_and_setup_pack_index(packs_head, sha1,
957 base_url);
958 i += 51;
959 break;
960 }
961 default:
962 while (i < buf.len && data[i] != '\n')
963 i++;
964 }
965 i++;
966 }
967
968 cleanup:
969 free(url);
970 return ret;
971 }
972
973 void release_http_pack_request(struct http_pack_request *preq)
974 {
975 if (preq->packfile != NULL) {
976 fclose(preq->packfile);
977 preq->packfile = NULL;
978 preq->slot->local = NULL;
979 }
980 if (preq->range_header != NULL) {
981 curl_slist_free_all(preq->range_header);
982 preq->range_header = NULL;
983 }
984 preq->slot = NULL;
985 free(preq->url);
986 }
987
988 int finish_http_pack_request(struct http_pack_request *preq)
989 {
990 int ret;
991 struct packed_git **lst;
992
993 preq->target->pack_size = ftell(preq->packfile);
994
995 if (preq->packfile != NULL) {
996 fclose(preq->packfile);
997 preq->packfile = NULL;
998 preq->slot->local = NULL;
999 }
1000
1001 ret = move_temp_to_file(preq->tmpfile, preq->filename);
1002 if (ret)
1003 return ret;
1004
1005 lst = preq->lst;
1006 while (*lst != preq->target)
1007 lst = &((*lst)->next);
1008 *lst = (*lst)->next;
1009
1010 if (verify_pack(preq->target))
1011 return -1;
1012 install_packed_git(preq->target);
1013
1014 return 0;
1015 }
1016
1017 struct http_pack_request *new_http_pack_request(
1018 struct packed_git *target, const char *base_url)
1019 {
1020 char *filename;
1021 long prev_posn = 0;
1022 char range[RANGE_HEADER_SIZE];
1023 struct strbuf buf = STRBUF_INIT;
1024 struct http_pack_request *preq;
1025
1026 preq = xmalloc(sizeof(*preq));
1027 preq->target = target;
1028 preq->range_header = NULL;
1029
1030 end_url_with_slash(&buf, base_url);
1031 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1032 sha1_to_hex(target->sha1));
1033 preq->url = strbuf_detach(&buf, NULL);
1034
1035 filename = sha1_pack_name(target->sha1);
1036 snprintf(preq->filename, sizeof(preq->filename), "%s", filename);
1037 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp", filename);
1038 preq->packfile = fopen(preq->tmpfile, "a");
1039 if (!preq->packfile) {
1040 error("Unable to open local file %s for pack",
1041 preq->tmpfile);
1042 goto abort;
1043 }
1044
1045 preq->slot = get_active_slot();
1046 preq->slot->local = preq->packfile;
1047 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1048 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1049 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1050 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1051 no_pragma_header);
1052
1053 /*
1054 * If there is data present from a previous transfer attempt,
1055 * resume where it left off
1056 */
1057 prev_posn = ftell(preq->packfile);
1058 if (prev_posn>0) {
1059 if (http_is_verbose)
1060 fprintf(stderr,
1061 "Resuming fetch of pack %s at byte %ld\n",
1062 sha1_to_hex(target->sha1), prev_posn);
1063 sprintf(range, "Range: bytes=%ld-", prev_posn);
1064 preq->range_header = curl_slist_append(NULL, range);
1065 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1066 preq->range_header);
1067 }
1068
1069 return preq;
1070
1071 abort:
1072 free(filename);
1073 free(preq->url);
1074 free(preq);
1075 return NULL;
1076 }
1077
1078 /* Helpers for fetching objects (loose) */
1079 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
1080 void *data)
1081 {
1082 unsigned char expn[4096];
1083 size_t size = eltsize * nmemb;
1084 int posn = 0;
1085 struct http_object_request *freq =
1086 (struct http_object_request *)data;
1087 do {
1088 ssize_t retval = xwrite(freq->localfile,
1089 (char *) ptr + posn, size - posn);
1090 if (retval < 0)
1091 return posn;
1092 posn += retval;
1093 } while (posn < size);
1094
1095 freq->stream.avail_in = size;
1096 freq->stream.next_in = ptr;
1097 do {
1098 freq->stream.next_out = expn;
1099 freq->stream.avail_out = sizeof(expn);
1100 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1101 git_SHA1_Update(&freq->c, expn,
1102 sizeof(expn) - freq->stream.avail_out);
1103 } while (freq->stream.avail_in && freq->zret == Z_OK);
1104 data_received++;
1105 return size;
1106 }
1107
1108 struct http_object_request *new_http_object_request(const char *base_url,
1109 unsigned char *sha1)
1110 {
1111 char *hex = sha1_to_hex(sha1);
1112 char *filename;
1113 char prevfile[PATH_MAX];
1114 int prevlocal;
1115 unsigned char prev_buf[PREV_BUF_SIZE];
1116 ssize_t prev_read = 0;
1117 long prev_posn = 0;
1118 char range[RANGE_HEADER_SIZE];
1119 struct curl_slist *range_header = NULL;
1120 struct http_object_request *freq;
1121
1122 freq = xmalloc(sizeof(*freq));
1123 hashcpy(freq->sha1, sha1);
1124 freq->localfile = -1;
1125
1126 filename = sha1_file_name(sha1);
1127 snprintf(freq->filename, sizeof(freq->filename), "%s", filename);
1128 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1129 "%s.temp", filename);
1130
1131 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1132 unlink_or_warn(prevfile);
1133 rename(freq->tmpfile, prevfile);
1134 unlink_or_warn(freq->tmpfile);
1135
1136 if (freq->localfile != -1)
1137 error("fd leakage in start: %d", freq->localfile);
1138 freq->localfile = open(freq->tmpfile,
1139 O_WRONLY | O_CREAT | O_EXCL, 0666);
1140 /*
1141 * This could have failed due to the "lazy directory creation";
1142 * try to mkdir the last path component.
1143 */
1144 if (freq->localfile < 0 && errno == ENOENT) {
1145 char *dir = strrchr(freq->tmpfile, '/');
1146 if (dir) {
1147 *dir = 0;
1148 mkdir(freq->tmpfile, 0777);
1149 *dir = '/';
1150 }
1151 freq->localfile = open(freq->tmpfile,
1152 O_WRONLY | O_CREAT | O_EXCL, 0666);
1153 }
1154
1155 if (freq->localfile < 0) {
1156 error("Couldn't create temporary file %s for %s: %s",
1157 freq->tmpfile, freq->filename, strerror(errno));
1158 goto abort;
1159 }
1160
1161 memset(&freq->stream, 0, sizeof(freq->stream));
1162
1163 git_inflate_init(&freq->stream);
1164
1165 git_SHA1_Init(&freq->c);
1166
1167 freq->url = get_remote_object_url(base_url, hex, 0);
1168
1169 /*
1170 * If a previous temp file is present, process what was already
1171 * fetched.
1172 */
1173 prevlocal = open(prevfile, O_RDONLY);
1174 if (prevlocal != -1) {
1175 do {
1176 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1177 if (prev_read>0) {
1178 if (fwrite_sha1_file(prev_buf,
1179 1,
1180 prev_read,
1181 freq) == prev_read) {
1182 prev_posn += prev_read;
1183 } else {
1184 prev_read = -1;
1185 }
1186 }
1187 } while (prev_read > 0);
1188 close(prevlocal);
1189 }
1190 unlink_or_warn(prevfile);
1191
1192 /*
1193 * Reset inflate/SHA1 if there was an error reading the previous temp
1194 * file; also rewind to the beginning of the local file.
1195 */
1196 if (prev_read == -1) {
1197 memset(&freq->stream, 0, sizeof(freq->stream));
1198 git_inflate_init(&freq->stream);
1199 git_SHA1_Init(&freq->c);
1200 if (prev_posn>0) {
1201 prev_posn = 0;
1202 lseek(freq->localfile, 0, SEEK_SET);
1203 if (ftruncate(freq->localfile, 0) < 0) {
1204 error("Couldn't truncate temporary file %s for %s: %s",
1205 freq->tmpfile, freq->filename, strerror(errno));
1206 goto abort;
1207 }
1208 }
1209 }
1210
1211 freq->slot = get_active_slot();
1212
1213 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1214 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1215 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1216 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1217 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1218
1219 /*
1220 * If we have successfully processed data from a previous fetch
1221 * attempt, only fetch the data we don't already have.
1222 */
1223 if (prev_posn>0) {
1224 if (http_is_verbose)
1225 fprintf(stderr,
1226 "Resuming fetch of object %s at byte %ld\n",
1227 hex, prev_posn);
1228 sprintf(range, "Range: bytes=%ld-", prev_posn);
1229 range_header = curl_slist_append(range_header, range);
1230 curl_easy_setopt(freq->slot->curl,
1231 CURLOPT_HTTPHEADER, range_header);
1232 }
1233
1234 return freq;
1235
1236 abort:
1237 free(filename);
1238 free(freq->url);
1239 free(freq);
1240 return NULL;
1241 }
1242
1243 void process_http_object_request(struct http_object_request *freq)
1244 {
1245 if (freq->slot == NULL)
1246 return;
1247 freq->curl_result = freq->slot->curl_result;
1248 freq->http_code = freq->slot->http_code;
1249 freq->slot = NULL;
1250 }
1251
1252 int finish_http_object_request(struct http_object_request *freq)
1253 {
1254 struct stat st;
1255
1256 close(freq->localfile);
1257 freq->localfile = -1;
1258
1259 process_http_object_request(freq);
1260
1261 if (freq->http_code == 416) {
1262 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
1263 } else if (freq->curl_result != CURLE_OK) {
1264 if (stat(freq->tmpfile, &st) == 0)
1265 if (st.st_size == 0)
1266 unlink_or_warn(freq->tmpfile);
1267 return -1;
1268 }
1269
1270 git_inflate_end(&freq->stream);
1271 git_SHA1_Final(freq->real_sha1, &freq->c);
1272 if (freq->zret != Z_STREAM_END) {
1273 unlink_or_warn(freq->tmpfile);
1274 return -1;
1275 }
1276 if (hashcmp(freq->sha1, freq->real_sha1)) {
1277 unlink_or_warn(freq->tmpfile);
1278 return -1;
1279 }
1280 freq->rename =
1281 move_temp_to_file(freq->tmpfile, freq->filename);
1282
1283 return freq->rename;
1284 }
1285
1286 void abort_http_object_request(struct http_object_request *freq)
1287 {
1288 unlink_or_warn(freq->tmpfile);
1289
1290 release_http_object_request(freq);
1291 }
1292
1293 void release_http_object_request(struct http_object_request *freq)
1294 {
1295 if (freq->localfile != -1) {
1296 close(freq->localfile);
1297 freq->localfile = -1;
1298 }
1299 if (freq->url != NULL) {
1300 free(freq->url);
1301 freq->url = NULL;
1302 }
1303 if (freq->slot != NULL) {
1304 freq->slot->callback_func = NULL;
1305 freq->slot->callback_data = NULL;
1306 release_active_slot(freq->slot);
1307 freq->slot = NULL;
1308 }
1309 }