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http.c: Use timeout suggested by curl instead of fixed 50ms timeout
[git/jnareb-git.git] / http.c
blob924be52add88690295cbbb27c3eca34bb6ec8f5a
1 #include "http.h"
2 #include "pack.h"
3 #include "sideband.h"
4 #include "run-command.h"
5 #include "url.h"
6
7 int data_received;
8 int active_requests;
9 int http_is_verbose;
10 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
11
12 #if LIBCURL_VERSION_NUM >= 0x070a06
13 #define LIBCURL_CAN_HANDLE_AUTH_ANY
14 #endif
15
16 static int min_curl_sessions = 1;
17 static int curl_session_count;
18 #ifdef USE_CURL_MULTI
19 static int max_requests = -1;
20 static CURLM *curlm;
21 #endif
22 #ifndef NO_CURL_EASY_DUPHANDLE
23 static CURL *curl_default;
24 #endif
25
26 #define PREV_BUF_SIZE 4096
27 #define RANGE_HEADER_SIZE 30
28
29 char curl_errorstr[CURL_ERROR_SIZE];
30
31 static int curl_ssl_verify = -1;
32 static const char *ssl_cert;
33 #if LIBCURL_VERSION_NUM >= 0x070903
34 static const char *ssl_key;
35 #endif
36 #if LIBCURL_VERSION_NUM >= 0x070908
37 static const char *ssl_capath;
38 #endif
39 static const char *ssl_cainfo;
40 static long curl_low_speed_limit = -1;
41 static long curl_low_speed_time = -1;
42 static int curl_ftp_no_epsv;
43 static const char *curl_http_proxy;
44 static char *user_name, *user_pass;
45 static const char *user_agent;
46
47 #if LIBCURL_VERSION_NUM >= 0x071700
48 /* Use CURLOPT_KEYPASSWD as is */
49 #elif LIBCURL_VERSION_NUM >= 0x070903
50 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
51 #else
52 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
53 #endif
54
55 static char *ssl_cert_password;
56 static int ssl_cert_password_required;
57
58 static struct curl_slist *pragma_header;
59 static struct curl_slist *no_pragma_header;
60
61 static struct active_request_slot *active_queue_head;
62
63 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
64 {
65 size_t size = eltsize * nmemb;
66 struct buffer *buffer = buffer_;
67
68 if (size > buffer->buf.len - buffer->posn)
69 size = buffer->buf.len - buffer->posn;
70 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
71 buffer->posn += size;
72
73 return size;
74 }
75
76 #ifndef NO_CURL_IOCTL
77 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
78 {
79 struct buffer *buffer = clientp;
80
81 switch (cmd) {
82 case CURLIOCMD_NOP:
83 return CURLIOE_OK;
84
85 case CURLIOCMD_RESTARTREAD:
86 buffer->posn = 0;
87 return CURLIOE_OK;
88
89 default:
90 return CURLIOE_UNKNOWNCMD;
91 }
92 }
93 #endif
94
95 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
96 {
97 size_t size = eltsize * nmemb;
98 struct strbuf *buffer = buffer_;
99
100 strbuf_add(buffer, ptr, size);
101 data_received++;
102 return size;
103 }
104
105 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
106 {
107 data_received++;
108 return eltsize * nmemb;
109 }
110
111 #ifdef USE_CURL_MULTI
112 static void process_curl_messages(void)
113 {
114 int num_messages;
115 struct active_request_slot *slot;
116 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
117
118 while (curl_message != NULL) {
119 if (curl_message->msg == CURLMSG_DONE) {
120 int curl_result = curl_message->data.result;
121 slot = active_queue_head;
122 while (slot != NULL &&
123 slot->curl != curl_message->easy_handle)
124 slot = slot->next;
125 if (slot != NULL) {
126 curl_multi_remove_handle(curlm, slot->curl);
127 slot->curl_result = curl_result;
128 finish_active_slot(slot);
129 } else {
130 fprintf(stderr, "Received DONE message for unknown request!\n");
131 }
132 } else {
133 fprintf(stderr, "Unknown CURL message received: %d\n",
134 (int)curl_message->msg);
135 }
136 curl_message = curl_multi_info_read(curlm, &num_messages);
137 }
138 }
139 #endif
140
141 static int http_options(const char *var, const char *value, void *cb)
142 {
143 if (!strcmp("http.sslverify", var)) {
144 curl_ssl_verify = git_config_bool(var, value);
145 return 0;
146 }
147 if (!strcmp("http.sslcert", var))
148 return git_config_string(&ssl_cert, var, value);
149 #if LIBCURL_VERSION_NUM >= 0x070903
150 if (!strcmp("http.sslkey", var))
151 return git_config_string(&ssl_key, var, value);
152 #endif
153 #if LIBCURL_VERSION_NUM >= 0x070908
154 if (!strcmp("http.sslcapath", var))
155 return git_config_string(&ssl_capath, var, value);
156 #endif
157 if (!strcmp("http.sslcainfo", var))
158 return git_config_string(&ssl_cainfo, var, value);
159 if (!strcmp("http.sslcertpasswordprotected", var)) {
160 if (git_config_bool(var, value))
161 ssl_cert_password_required = 1;
162 return 0;
163 }
164 if (!strcmp("http.minsessions", var)) {
165 min_curl_sessions = git_config_int(var, value);
166 #ifndef USE_CURL_MULTI
167 if (min_curl_sessions > 1)
168 min_curl_sessions = 1;
169 #endif
170 return 0;
171 }
172 #ifdef USE_CURL_MULTI
173 if (!strcmp("http.maxrequests", var)) {
174 max_requests = git_config_int(var, value);
175 return 0;
176 }
177 #endif
178 if (!strcmp("http.lowspeedlimit", var)) {
179 curl_low_speed_limit = (long)git_config_int(var, value);
180 return 0;
181 }
182 if (!strcmp("http.lowspeedtime", var)) {
183 curl_low_speed_time = (long)git_config_int(var, value);
184 return 0;
185 }
186
187 if (!strcmp("http.noepsv", var)) {
188 curl_ftp_no_epsv = git_config_bool(var, value);
189 return 0;
190 }
191 if (!strcmp("http.proxy", var))
192 return git_config_string(&curl_http_proxy, var, value);
193
194 if (!strcmp("http.postbuffer", var)) {
195 http_post_buffer = git_config_int(var, value);
196 if (http_post_buffer < LARGE_PACKET_MAX)
197 http_post_buffer = LARGE_PACKET_MAX;
198 return 0;
199 }
200
201 if (!strcmp("http.useragent", var))
202 return git_config_string(&user_agent, var, value);
203
204 /* Fall back on the default ones */
205 return git_default_config(var, value, cb);
206 }
207
208 static void init_curl_http_auth(CURL *result)
209 {
210 if (user_name) {
211 struct strbuf up = STRBUF_INIT;
212 if (!user_pass)
213 user_pass = xstrdup(git_getpass("Password: "));
214 strbuf_addf(&up, "%s:%s", user_name, user_pass);
215 curl_easy_setopt(result, CURLOPT_USERPWD,
216 strbuf_detach(&up, NULL));
217 }
218 }
219
220 static int has_cert_password(void)
221 {
222 if (ssl_cert_password != NULL)
223 return 1;
224 if (ssl_cert == NULL || ssl_cert_password_required != 1)
225 return 0;
226 /* Only prompt the user once. */
227 ssl_cert_password_required = -1;
228 ssl_cert_password = git_getpass("Certificate Password: ");
229 if (ssl_cert_password != NULL) {
230 ssl_cert_password = xstrdup(ssl_cert_password);
231 return 1;
232 } else
233 return 0;
234 }
235
236 static CURL *get_curl_handle(void)
237 {
238 CURL *result = curl_easy_init();
239
240 if (!curl_ssl_verify) {
241 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
242 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
243 } else {
244 /* Verify authenticity of the peer's certificate */
245 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
246 /* The name in the cert must match whom we tried to connect */
247 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
248 }
249
250 #if LIBCURL_VERSION_NUM >= 0x070907
251 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
252 #endif
253 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
254 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
255 #endif
256
257 init_curl_http_auth(result);
258
259 if (ssl_cert != NULL)
260 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
261 if (has_cert_password())
262 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
263 #if LIBCURL_VERSION_NUM >= 0x070903
264 if (ssl_key != NULL)
265 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
266 #endif
267 #if LIBCURL_VERSION_NUM >= 0x070908
268 if (ssl_capath != NULL)
269 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
270 #endif
271 if (ssl_cainfo != NULL)
272 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
273 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
274
275 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
276 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
277 curl_low_speed_limit);
278 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
279 curl_low_speed_time);
280 }
281
282 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
283 #if LIBCURL_VERSION_NUM >= 0x071301
284 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
285 #elif LIBCURL_VERSION_NUM >= 0x071101
286 curl_easy_setopt(result, CURLOPT_POST301, 1);
287 #endif
288
289 if (getenv("GIT_CURL_VERBOSE"))
290 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
291
292 curl_easy_setopt(result, CURLOPT_USERAGENT,
293 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
294
295 if (curl_ftp_no_epsv)
296 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
297
298 if (curl_http_proxy)
299 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
300
301 return result;
302 }
303
304 static void http_auth_init(const char *url)
305 {
306 char *at, *colon, *cp, *slash, *decoded;
307 int len;
308
309 cp = strstr(url, "://");
310 if (!cp)
311 return;
312
313 /*
314 * Ok, the URL looks like "proto://something". Which one?
315 * "proto://<user>:<pass>@<host>/...",
316 * "proto://<user>@<host>/...", or just
317 * "proto://<host>/..."?
318 */
319 cp += 3;
320 at = strchr(cp, '@');
321 colon = strchr(cp, ':');
322 slash = strchrnul(cp, '/');
323 if (!at || slash <= at)
324 return; /* No credentials */
325 if (!colon || at <= colon) {
326 /* Only username */
327 len = at - cp;
328 user_name = xmalloc(len + 1);
329 memcpy(user_name, cp, len);
330 user_name[len] = '\0';
331 decoded = url_decode(user_name);
332 free(user_name);
333 user_name = decoded;
334 user_pass = NULL;
335 } else {
336 len = colon - cp;
337 user_name = xmalloc(len + 1);
338 memcpy(user_name, cp, len);
339 user_name[len] = '\0';
340 decoded = url_decode(user_name);
341 free(user_name);
342 user_name = decoded;
343 len = at - (colon + 1);
344 user_pass = xmalloc(len + 1);
345 memcpy(user_pass, colon + 1, len);
346 user_pass[len] = '\0';
347 decoded = url_decode(user_pass);
348 free(user_pass);
349 user_pass = decoded;
350 }
351 }
352
353 static void set_from_env(const char **var, const char *envname)
354 {
355 const char *val = getenv(envname);
356 if (val)
357 *var = val;
358 }
359
360 void http_init(struct remote *remote)
361 {
362 char *low_speed_limit;
363 char *low_speed_time;
364
365 http_is_verbose = 0;
366
367 git_config(http_options, NULL);
368
369 curl_global_init(CURL_GLOBAL_ALL);
370
371 if (remote && remote->http_proxy)
372 curl_http_proxy = xstrdup(remote->http_proxy);
373
374 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
375 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
376
377 #ifdef USE_CURL_MULTI
378 {
379 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
380 if (http_max_requests != NULL)
381 max_requests = atoi(http_max_requests);
382 }
383
384 curlm = curl_multi_init();
385 if (curlm == NULL) {
386 fprintf(stderr, "Error creating curl multi handle.\n");
387 exit(1);
388 }
389 #endif
390
391 if (getenv("GIT_SSL_NO_VERIFY"))
392 curl_ssl_verify = 0;
393
394 set_from_env(&ssl_cert, "GIT_SSL_CERT");
395 #if LIBCURL_VERSION_NUM >= 0x070903
396 set_from_env(&ssl_key, "GIT_SSL_KEY");
397 #endif
398 #if LIBCURL_VERSION_NUM >= 0x070908
399 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
400 #endif
401 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
402
403 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
404
405 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
406 if (low_speed_limit != NULL)
407 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
408 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
409 if (low_speed_time != NULL)
410 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
411
412 if (curl_ssl_verify == -1)
413 curl_ssl_verify = 1;
414
415 curl_session_count = 0;
416 #ifdef USE_CURL_MULTI
417 if (max_requests < 1)
418 max_requests = DEFAULT_MAX_REQUESTS;
419 #endif
420
421 if (getenv("GIT_CURL_FTP_NO_EPSV"))
422 curl_ftp_no_epsv = 1;
423
424 if (remote && remote->url && remote->url[0]) {
425 http_auth_init(remote->url[0]);
426 if (!ssl_cert_password_required &&
427 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
428 !prefixcmp(remote->url[0], "https://"))
429 ssl_cert_password_required = 1;
430 }
431
432 #ifndef NO_CURL_EASY_DUPHANDLE
433 curl_default = get_curl_handle();
434 #endif
435 }
436
437 void http_cleanup(void)
438 {
439 struct active_request_slot *slot = active_queue_head;
440
441 while (slot != NULL) {
442 struct active_request_slot *next = slot->next;
443 if (slot->curl != NULL) {
444 #ifdef USE_CURL_MULTI
445 curl_multi_remove_handle(curlm, slot->curl);
446 #endif
447 curl_easy_cleanup(slot->curl);
448 }
449 free(slot);
450 slot = next;
451 }
452 active_queue_head = NULL;
453
454 #ifndef NO_CURL_EASY_DUPHANDLE
455 curl_easy_cleanup(curl_default);
456 #endif
457
458 #ifdef USE_CURL_MULTI
459 curl_multi_cleanup(curlm);
460 #endif
461 curl_global_cleanup();
462
463 curl_slist_free_all(pragma_header);
464 pragma_header = NULL;
465
466 curl_slist_free_all(no_pragma_header);
467 no_pragma_header = NULL;
468
469 if (curl_http_proxy) {
470 free((void *)curl_http_proxy);
471 curl_http_proxy = NULL;
472 }
473
474 if (ssl_cert_password != NULL) {
475 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
476 free(ssl_cert_password);
477 ssl_cert_password = NULL;
478 }
479 ssl_cert_password_required = 0;
480 }
481
482 struct active_request_slot *get_active_slot(void)
483 {
484 struct active_request_slot *slot = active_queue_head;
485 struct active_request_slot *newslot;
486
487 #ifdef USE_CURL_MULTI
488 int num_transfers;
489
490 /* Wait for a slot to open up if the queue is full */
491 while (active_requests >= max_requests) {
492 curl_multi_perform(curlm, &num_transfers);
493 if (num_transfers < active_requests)
494 process_curl_messages();
495 }
496 #endif
497
498 while (slot != NULL && slot->in_use)
499 slot = slot->next;
500
501 if (slot == NULL) {
502 newslot = xmalloc(sizeof(*newslot));
503 newslot->curl = NULL;
504 newslot->in_use = 0;
505 newslot->next = NULL;
506
507 slot = active_queue_head;
508 if (slot == NULL) {
509 active_queue_head = newslot;
510 } else {
511 while (slot->next != NULL)
512 slot = slot->next;
513 slot->next = newslot;
514 }
515 slot = newslot;
516 }
517
518 if (slot->curl == NULL) {
519 #ifdef NO_CURL_EASY_DUPHANDLE
520 slot->curl = get_curl_handle();
521 #else
522 slot->curl = curl_easy_duphandle(curl_default);
523 #endif
524 curl_session_count++;
525 }
526
527 active_requests++;
528 slot->in_use = 1;
529 slot->local = NULL;
530 slot->results = NULL;
531 slot->finished = NULL;
532 slot->callback_data = NULL;
533 slot->callback_func = NULL;
534 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
535 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
536 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
537 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
538 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
539 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
540 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
541 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
542
543 return slot;
544 }
545
546 int start_active_slot(struct active_request_slot *slot)
547 {
548 #ifdef USE_CURL_MULTI
549 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
550 int num_transfers;
551
552 if (curlm_result != CURLM_OK &&
553 curlm_result != CURLM_CALL_MULTI_PERFORM) {
554 active_requests--;
555 slot->in_use = 0;
556 return 0;
557 }
558
559 /*
560 * We know there must be something to do, since we just added
561 * something.
562 */
563 curl_multi_perform(curlm, &num_transfers);
564 #endif
565 return 1;
566 }
567
568 #ifdef USE_CURL_MULTI
569 struct fill_chain {
570 void *data;
571 int (*fill)(void *);
572 struct fill_chain *next;
573 };
574
575 static struct fill_chain *fill_cfg;
576
577 void add_fill_function(void *data, int (*fill)(void *))
578 {
579 struct fill_chain *new = xmalloc(sizeof(*new));
580 struct fill_chain **linkp = &fill_cfg;
581 new->data = data;
582 new->fill = fill;
583 new->next = NULL;
584 while (*linkp)
585 linkp = &(*linkp)->next;
586 *linkp = new;
587 }
588
589 void fill_active_slots(void)
590 {
591 struct active_request_slot *slot = active_queue_head;
592
593 while (active_requests < max_requests) {
594 struct fill_chain *fill;
595 for (fill = fill_cfg; fill; fill = fill->next)
596 if (fill->fill(fill->data))
597 break;
598
599 if (!fill)
600 break;
601 }
602
603 while (slot != NULL) {
604 if (!slot->in_use && slot->curl != NULL
605 && curl_session_count > min_curl_sessions) {
606 curl_easy_cleanup(slot->curl);
607 slot->curl = NULL;
608 curl_session_count--;
609 }
610 slot = slot->next;
611 }
612 }
613
614 void step_active_slots(void)
615 {
616 int num_transfers;
617 CURLMcode curlm_result;
618
619 do {
620 curlm_result = curl_multi_perform(curlm, &num_transfers);
621 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
622 if (num_transfers < active_requests) {
623 process_curl_messages();
624 fill_active_slots();
625 }
626 }
627 #endif
628
629 void run_active_slot(struct active_request_slot *slot)
630 {
631 #ifdef USE_CURL_MULTI
632 long last_pos = 0;
633 long current_pos;
634 fd_set readfds;
635 fd_set writefds;
636 fd_set excfds;
637 int max_fd;
638 struct timeval select_timeout;
639 int finished = 0;
640
641 slot->finished = &finished;
642 while (!finished) {
643 data_received = 0;
644 step_active_slots();
645
646 if (!data_received && slot->local != NULL) {
647 current_pos = ftell(slot->local);
648 if (current_pos > last_pos)
649 data_received++;
650 last_pos = current_pos;
651 }
652
653 if (slot->in_use && !data_received) {
654 #if LIBCURL_VERSION_NUM >= 0x070f04
655 long curl_timeout;
656 curl_multi_timeout(curlm, &curl_timeout);
657 if (curl_timeout == 0) {
658 continue;
659 } else if (curl_timeout == -1) {
660 select_timeout.tv_sec = 0;
661 select_timeout.tv_usec = 50000;
662 } else {
663 select_timeout.tv_sec = curl_timeout / 1000;
664 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
665 }
666 #else
667 select_timeout.tv_sec = 0;
668 select_timeout.tv_usec = 50000;
669 #endif
670
671 max_fd = -1;
672 FD_ZERO(&readfds);
673 FD_ZERO(&writefds);
674 FD_ZERO(&excfds);
675 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
676
677 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
678 }
679 }
680 #else
681 while (slot->in_use) {
682 slot->curl_result = curl_easy_perform(slot->curl);
683 finish_active_slot(slot);
684 }
685 #endif
686 }
687
688 static void closedown_active_slot(struct active_request_slot *slot)
689 {
690 active_requests--;
691 slot->in_use = 0;
692 }
693
694 static void release_active_slot(struct active_request_slot *slot)
695 {
696 closedown_active_slot(slot);
697 if (slot->curl && curl_session_count > min_curl_sessions) {
698 #ifdef USE_CURL_MULTI
699 curl_multi_remove_handle(curlm, slot->curl);
700 #endif
701 curl_easy_cleanup(slot->curl);
702 slot->curl = NULL;
703 curl_session_count--;
704 }
705 #ifdef USE_CURL_MULTI
706 fill_active_slots();
707 #endif
708 }
709
710 void finish_active_slot(struct active_request_slot *slot)
711 {
712 closedown_active_slot(slot);
713 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
714
715 if (slot->finished != NULL)
716 (*slot->finished) = 1;
717
718 /* Store slot results so they can be read after the slot is reused */
719 if (slot->results != NULL) {
720 slot->results->curl_result = slot->curl_result;
721 slot->results->http_code = slot->http_code;
722 }
723
724 /* Run callback if appropriate */
725 if (slot->callback_func != NULL)
726 slot->callback_func(slot->callback_data);
727 }
728
729 void finish_all_active_slots(void)
730 {
731 struct active_request_slot *slot = active_queue_head;
732
733 while (slot != NULL)
734 if (slot->in_use) {
735 run_active_slot(slot);
736 slot = active_queue_head;
737 } else {
738 slot = slot->next;
739 }
740 }
741
742 /* Helpers for modifying and creating URLs */
743 static inline int needs_quote(int ch)
744 {
745 if (((ch >= 'A') && (ch <= 'Z'))
746 || ((ch >= 'a') && (ch <= 'z'))
747 || ((ch >= '0') && (ch <= '9'))
748 || (ch == '/')
749 || (ch == '-')
750 || (ch == '.'))
751 return 0;
752 return 1;
753 }
754
755 static inline int hex(int v)
756 {
757 if (v < 10)
758 return '0' + v;
759 else
760 return 'A' + v - 10;
761 }
762
763 static char *quote_ref_url(const char *base, const char *ref)
764 {
765 struct strbuf buf = STRBUF_INIT;
766 const char *cp;
767 int ch;
768
769 end_url_with_slash(&buf, base);
770
771 for (cp = ref; (ch = *cp) != 0; cp++)
772 if (needs_quote(ch))
773 strbuf_addf(&buf, "%%%02x", ch);
774 else
775 strbuf_addch(&buf, *cp);
776
777 return strbuf_detach(&buf, NULL);
778 }
779
780 void append_remote_object_url(struct strbuf *buf, const char *url,
781 const char *hex,
782 int only_two_digit_prefix)
783 {
784 end_url_with_slash(buf, url);
785
786 strbuf_addf(buf, "objects/%.*s/", 2, hex);
787 if (!only_two_digit_prefix)
788 strbuf_addf(buf, "%s", hex+2);
789 }
790
791 char *get_remote_object_url(const char *url, const char *hex,
792 int only_two_digit_prefix)
793 {
794 struct strbuf buf = STRBUF_INIT;
795 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
796 return strbuf_detach(&buf, NULL);
797 }
798
799 /* http_request() targets */
800 #define HTTP_REQUEST_STRBUF 0
801 #define HTTP_REQUEST_FILE 1
802
803 static int http_request(const char *url, void *result, int target, int options)
804 {
805 struct active_request_slot *slot;
806 struct slot_results results;
807 struct curl_slist *headers = NULL;
808 struct strbuf buf = STRBUF_INIT;
809 int ret;
810
811 slot = get_active_slot();
812 slot->results = &results;
813 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
814
815 if (result == NULL) {
816 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
817 } else {
818 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
819 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
820
821 if (target == HTTP_REQUEST_FILE) {
822 long posn = ftell(result);
823 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
824 fwrite);
825 if (posn > 0) {
826 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
827 headers = curl_slist_append(headers, buf.buf);
828 strbuf_reset(&buf);
829 }
830 slot->local = result;
831 } else
832 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
833 fwrite_buffer);
834 }
835
836 strbuf_addstr(&buf, "Pragma:");
837 if (options & HTTP_NO_CACHE)
838 strbuf_addstr(&buf, " no-cache");
839
840 headers = curl_slist_append(headers, buf.buf);
841
842 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
843 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
844
845 if (start_active_slot(slot)) {
846 run_active_slot(slot);
847 if (results.curl_result == CURLE_OK)
848 ret = HTTP_OK;
849 else if (missing_target(&results))
850 ret = HTTP_MISSING_TARGET;
851 else if (results.http_code == 401) {
852 if (user_name) {
853 ret = HTTP_NOAUTH;
854 } else {
855 /*
856 * git_getpass is needed here because its very likely stdin/stdout are
857 * pipes to our parent process. So we instead need to use /dev/tty,
858 * but that is non-portable. Using git_getpass() can at least be stubbed
859 * on other platforms with a different implementation if/when necessary.
860 */
861 user_name = xstrdup(git_getpass("Username: "));
862 init_curl_http_auth(slot->curl);
863 ret = HTTP_REAUTH;
864 }
865 } else
866 ret = HTTP_ERROR;
867 } else {
868 error("Unable to start HTTP request for %s", url);
869 ret = HTTP_START_FAILED;
870 }
871
872 slot->local = NULL;
873 curl_slist_free_all(headers);
874 strbuf_release(&buf);
875
876 return ret;
877 }
878
879 int http_get_strbuf(const char *url, struct strbuf *result, int options)
880 {
881 int http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
882 if (http_ret == HTTP_REAUTH) {
883 http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
884 }
885 return http_ret;
886 }
887
888 /*
889 * Downloads an url and stores the result in the given file.
890 *
891 * If a previous interrupted download is detected (i.e. a previous temporary
892 * file is still around) the download is resumed.
893 */
894 static int http_get_file(const char *url, const char *filename, int options)
895 {
896 int ret;
897 struct strbuf tmpfile = STRBUF_INIT;
898 FILE *result;
899
900 strbuf_addf(&tmpfile, "%s.temp", filename);
901 result = fopen(tmpfile.buf, "a");
902 if (! result) {
903 error("Unable to open local file %s", tmpfile.buf);
904 ret = HTTP_ERROR;
905 goto cleanup;
906 }
907
908 ret = http_request(url, result, HTTP_REQUEST_FILE, options);
909 fclose(result);
910
911 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
912 ret = HTTP_ERROR;
913 cleanup:
914 strbuf_release(&tmpfile);
915 return ret;
916 }
917
918 int http_error(const char *url, int ret)
919 {
920 /* http_request has already handled HTTP_START_FAILED. */
921 if (ret != HTTP_START_FAILED)
922 error("%s while accessing %s\n", curl_errorstr, url);
923
924 return ret;
925 }
926
927 int http_fetch_ref(const char *base, struct ref *ref)
928 {
929 char *url;
930 struct strbuf buffer = STRBUF_INIT;
931 int ret = -1;
932
933 url = quote_ref_url(base, ref->name);
934 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
935 strbuf_rtrim(&buffer);
936 if (buffer.len == 40)
937 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
938 else if (!prefixcmp(buffer.buf, "ref: ")) {
939 ref->symref = xstrdup(buffer.buf + 5);
940 ret = 0;
941 }
942 }
943
944 strbuf_release(&buffer);
945 free(url);
946 return ret;
947 }
948
949 /* Helpers for fetching packs */
950 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
951 {
952 char *url, *tmp;
953 struct strbuf buf = STRBUF_INIT;
954
955 if (http_is_verbose)
956 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
957
958 end_url_with_slash(&buf, base_url);
959 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
960 url = strbuf_detach(&buf, NULL);
961
962 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
963 tmp = strbuf_detach(&buf, NULL);
964
965 if (http_get_file(url, tmp, 0) != HTTP_OK) {
966 error("Unable to get pack index %s\n", url);
967 free(tmp);
968 tmp = NULL;
969 }
970
971 free(url);
972 return tmp;
973 }
974
975 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
976 unsigned char *sha1, const char *base_url)
977 {
978 struct packed_git *new_pack;
979 char *tmp_idx = NULL;
980 int ret;
981
982 if (has_pack_index(sha1)) {
983 new_pack = parse_pack_index(sha1, NULL);
984 if (!new_pack)
985 return -1; /* parse_pack_index() already issued error message */
986 goto add_pack;
987 }
988
989 tmp_idx = fetch_pack_index(sha1, base_url);
990 if (!tmp_idx)
991 return -1;
992
993 new_pack = parse_pack_index(sha1, tmp_idx);
994 if (!new_pack) {
995 unlink(tmp_idx);
996 free(tmp_idx);
997
998 return -1; /* parse_pack_index() already issued error message */
999 }
1000
1001 ret = verify_pack_index(new_pack);
1002 if (!ret) {
1003 close_pack_index(new_pack);
1004 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1005 }
1006 free(tmp_idx);
1007 if (ret)
1008 return -1;
1009
1010 add_pack:
1011 new_pack->next = *packs_head;
1012 *packs_head = new_pack;
1013 return 0;
1014 }
1015
1016 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1017 {
1018 int ret = 0, i = 0;
1019 char *url, *data;
1020 struct strbuf buf = STRBUF_INIT;
1021 unsigned char sha1[20];
1022
1023 end_url_with_slash(&buf, base_url);
1024 strbuf_addstr(&buf, "objects/info/packs");
1025 url = strbuf_detach(&buf, NULL);
1026
1027 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1028 if (ret != HTTP_OK)
1029 goto cleanup;
1030
1031 data = buf.buf;
1032 while (i < buf.len) {
1033 switch (data[i]) {
1034 case 'P':
1035 i++;
1036 if (i + 52 <= buf.len &&
1037 !prefixcmp(data + i, " pack-") &&
1038 !prefixcmp(data + i + 46, ".pack\n")) {
1039 get_sha1_hex(data + i + 6, sha1);
1040 fetch_and_setup_pack_index(packs_head, sha1,
1041 base_url);
1042 i += 51;
1043 break;
1044 }
1045 default:
1046 while (i < buf.len && data[i] != '\n')
1047 i++;
1048 }
1049 i++;
1050 }
1051
1052 cleanup:
1053 free(url);
1054 return ret;
1055 }
1056
1057 void release_http_pack_request(struct http_pack_request *preq)
1058 {
1059 if (preq->packfile != NULL) {
1060 fclose(preq->packfile);
1061 preq->packfile = NULL;
1062 preq->slot->local = NULL;
1063 }
1064 if (preq->range_header != NULL) {
1065 curl_slist_free_all(preq->range_header);
1066 preq->range_header = NULL;
1067 }
1068 preq->slot = NULL;
1069 free(preq->url);
1070 }
1071
1072 int finish_http_pack_request(struct http_pack_request *preq)
1073 {
1074 struct packed_git **lst;
1075 struct packed_git *p = preq->target;
1076 char *tmp_idx;
1077 struct child_process ip;
1078 const char *ip_argv[8];
1079
1080 close_pack_index(p);
1081
1082 fclose(preq->packfile);
1083 preq->packfile = NULL;
1084 preq->slot->local = NULL;
1085
1086 lst = preq->lst;
1087 while (*lst != p)
1088 lst = &((*lst)->next);
1089 *lst = (*lst)->next;
1090
1091 tmp_idx = xstrdup(preq->tmpfile);
1092 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1093 ".idx.temp");
1094
1095 ip_argv[0] = "index-pack";
1096 ip_argv[1] = "-o";
1097 ip_argv[2] = tmp_idx;
1098 ip_argv[3] = preq->tmpfile;
1099 ip_argv[4] = NULL;
1100
1101 memset(&ip, 0, sizeof(ip));
1102 ip.argv = ip_argv;
1103 ip.git_cmd = 1;
1104 ip.no_stdin = 1;
1105 ip.no_stdout = 1;
1106
1107 if (run_command(&ip)) {
1108 unlink(preq->tmpfile);
1109 unlink(tmp_idx);
1110 free(tmp_idx);
1111 return -1;
1112 }
1113
1114 unlink(sha1_pack_index_name(p->sha1));
1115
1116 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1117 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1118 free(tmp_idx);
1119 return -1;
1120 }
1121
1122 install_packed_git(p);
1123 free(tmp_idx);
1124 return 0;
1125 }
1126
1127 struct http_pack_request *new_http_pack_request(
1128 struct packed_git *target, const char *base_url)
1129 {
1130 long prev_posn = 0;
1131 char range[RANGE_HEADER_SIZE];
1132 struct strbuf buf = STRBUF_INIT;
1133 struct http_pack_request *preq;
1134
1135 preq = xmalloc(sizeof(*preq));
1136 preq->target = target;
1137 preq->range_header = NULL;
1138
1139 end_url_with_slash(&buf, base_url);
1140 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1141 sha1_to_hex(target->sha1));
1142 preq->url = strbuf_detach(&buf, NULL);
1143
1144 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1145 sha1_pack_name(target->sha1));
1146 preq->packfile = fopen(preq->tmpfile, "a");
1147 if (!preq->packfile) {
1148 error("Unable to open local file %s for pack",
1149 preq->tmpfile);
1150 goto abort;
1151 }
1152
1153 preq->slot = get_active_slot();
1154 preq->slot->local = preq->packfile;
1155 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1156 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1157 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1158 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1159 no_pragma_header);
1160
1161 /*
1162 * If there is data present from a previous transfer attempt,
1163 * resume where it left off
1164 */
1165 prev_posn = ftell(preq->packfile);
1166 if (prev_posn>0) {
1167 if (http_is_verbose)
1168 fprintf(stderr,
1169 "Resuming fetch of pack %s at byte %ld\n",
1170 sha1_to_hex(target->sha1), prev_posn);
1171 sprintf(range, "Range: bytes=%ld-", prev_posn);
1172 preq->range_header = curl_slist_append(NULL, range);
1173 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1174 preq->range_header);
1175 }
1176
1177 return preq;
1178
1179 abort:
1180 free(preq->url);
1181 free(preq);
1182 return NULL;
1183 }
1184
1185 /* Helpers for fetching objects (loose) */
1186 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1187 void *data)
1188 {
1189 unsigned char expn[4096];
1190 size_t size = eltsize * nmemb;
1191 int posn = 0;
1192 struct http_object_request *freq =
1193 (struct http_object_request *)data;
1194 do {
1195 ssize_t retval = xwrite(freq->localfile,
1196 (char *) ptr + posn, size - posn);
1197 if (retval < 0)
1198 return posn;
1199 posn += retval;
1200 } while (posn < size);
1201
1202 freq->stream.avail_in = size;
1203 freq->stream.next_in = (void *)ptr;
1204 do {
1205 freq->stream.next_out = expn;
1206 freq->stream.avail_out = sizeof(expn);
1207 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1208 git_SHA1_Update(&freq->c, expn,
1209 sizeof(expn) - freq->stream.avail_out);
1210 } while (freq->stream.avail_in && freq->zret == Z_OK);
1211 data_received++;
1212 return size;
1213 }
1214
1215 struct http_object_request *new_http_object_request(const char *base_url,
1216 unsigned char *sha1)
1217 {
1218 char *hex = sha1_to_hex(sha1);
1219 char *filename;
1220 char prevfile[PATH_MAX];
1221 int prevlocal;
1222 char prev_buf[PREV_BUF_SIZE];
1223 ssize_t prev_read = 0;
1224 long prev_posn = 0;
1225 char range[RANGE_HEADER_SIZE];
1226 struct curl_slist *range_header = NULL;
1227 struct http_object_request *freq;
1228
1229 freq = xmalloc(sizeof(*freq));
1230 hashcpy(freq->sha1, sha1);
1231 freq->localfile = -1;
1232
1233 filename = sha1_file_name(sha1);
1234 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1235 "%s.temp", filename);
1236
1237 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1238 unlink_or_warn(prevfile);
1239 rename(freq->tmpfile, prevfile);
1240 unlink_or_warn(freq->tmpfile);
1241
1242 if (freq->localfile != -1)
1243 error("fd leakage in start: %d", freq->localfile);
1244 freq->localfile = open(freq->tmpfile,
1245 O_WRONLY | O_CREAT | O_EXCL, 0666);
1246 /*
1247 * This could have failed due to the "lazy directory creation";
1248 * try to mkdir the last path component.
1249 */
1250 if (freq->localfile < 0 && errno == ENOENT) {
1251 char *dir = strrchr(freq->tmpfile, '/');
1252 if (dir) {
1253 *dir = 0;
1254 mkdir(freq->tmpfile, 0777);
1255 *dir = '/';
1256 }
1257 freq->localfile = open(freq->tmpfile,
1258 O_WRONLY | O_CREAT | O_EXCL, 0666);
1259 }
1260
1261 if (freq->localfile < 0) {
1262 error("Couldn't create temporary file %s: %s",
1263 freq->tmpfile, strerror(errno));
1264 goto abort;
1265 }
1266
1267 memset(&freq->stream, 0, sizeof(freq->stream));
1268
1269 git_inflate_init(&freq->stream);
1270
1271 git_SHA1_Init(&freq->c);
1272
1273 freq->url = get_remote_object_url(base_url, hex, 0);
1274
1275 /*
1276 * If a previous temp file is present, process what was already
1277 * fetched.
1278 */
1279 prevlocal = open(prevfile, O_RDONLY);
1280 if (prevlocal != -1) {
1281 do {
1282 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1283 if (prev_read>0) {
1284 if (fwrite_sha1_file(prev_buf,
1285 1,
1286 prev_read,
1287 freq) == prev_read) {
1288 prev_posn += prev_read;
1289 } else {
1290 prev_read = -1;
1291 }
1292 }
1293 } while (prev_read > 0);
1294 close(prevlocal);
1295 }
1296 unlink_or_warn(prevfile);
1297
1298 /*
1299 * Reset inflate/SHA1 if there was an error reading the previous temp
1300 * file; also rewind to the beginning of the local file.
1301 */
1302 if (prev_read == -1) {
1303 memset(&freq->stream, 0, sizeof(freq->stream));
1304 git_inflate_init(&freq->stream);
1305 git_SHA1_Init(&freq->c);
1306 if (prev_posn>0) {
1307 prev_posn = 0;
1308 lseek(freq->localfile, 0, SEEK_SET);
1309 if (ftruncate(freq->localfile, 0) < 0) {
1310 error("Couldn't truncate temporary file %s: %s",
1311 freq->tmpfile, strerror(errno));
1312 goto abort;
1313 }
1314 }
1315 }
1316
1317 freq->slot = get_active_slot();
1318
1319 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1320 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1321 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1322 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1323 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1324
1325 /*
1326 * If we have successfully processed data from a previous fetch
1327 * attempt, only fetch the data we don't already have.
1328 */
1329 if (prev_posn>0) {
1330 if (http_is_verbose)
1331 fprintf(stderr,
1332 "Resuming fetch of object %s at byte %ld\n",
1333 hex, prev_posn);
1334 sprintf(range, "Range: bytes=%ld-", prev_posn);
1335 range_header = curl_slist_append(range_header, range);
1336 curl_easy_setopt(freq->slot->curl,
1337 CURLOPT_HTTPHEADER, range_header);
1338 }
1339
1340 return freq;
1341
1342 abort:
1343 free(filename);
1344 free(freq->url);
1345 free(freq);
1346 return NULL;
1347 }
1348
1349 void process_http_object_request(struct http_object_request *freq)
1350 {
1351 if (freq->slot == NULL)
1352 return;
1353 freq->curl_result = freq->slot->curl_result;
1354 freq->http_code = freq->slot->http_code;
1355 freq->slot = NULL;
1356 }
1357
1358 int finish_http_object_request(struct http_object_request *freq)
1359 {
1360 struct stat st;
1361
1362 close(freq->localfile);
1363 freq->localfile = -1;
1364
1365 process_http_object_request(freq);
1366
1367 if (freq->http_code == 416) {
1368 warning("requested range invalid; we may already have all the data.");
1369 } else if (freq->curl_result != CURLE_OK) {
1370 if (stat(freq->tmpfile, &st) == 0)
1371 if (st.st_size == 0)
1372 unlink_or_warn(freq->tmpfile);
1373 return -1;
1374 }
1375
1376 git_inflate_end(&freq->stream);
1377 git_SHA1_Final(freq->real_sha1, &freq->c);
1378 if (freq->zret != Z_STREAM_END) {
1379 unlink_or_warn(freq->tmpfile);
1380 return -1;
1381 }
1382 if (hashcmp(freq->sha1, freq->real_sha1)) {
1383 unlink_or_warn(freq->tmpfile);
1384 return -1;
1385 }
1386 freq->rename =
1387 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1388
1389 return freq->rename;
1390 }
1391
1392 void abort_http_object_request(struct http_object_request *freq)
1393 {
1394 unlink_or_warn(freq->tmpfile);
1395
1396 release_http_object_request(freq);
1397 }
1398
1399 void release_http_object_request(struct http_object_request *freq)
1400 {
1401 if (freq->localfile != -1) {
1402 close(freq->localfile);
1403 freq->localfile = -1;
1404 }
1405 if (freq->url != NULL) {
1406 free(freq->url);
1407 freq->url = NULL;
1408 }
1409 if (freq->slot != NULL) {
1410 freq->slot->callback_func = NULL;
1411 freq->slot->callback_data = NULL;
1412 release_active_slot(freq->slot);
1413 freq->slot = NULL;
1414 }
1415 }
git with Jakub Narębski modifications