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help: correct behavior for is_executable on Windows
[git/mingw/4msysgit.git] / http.c
blob3b312a85e86fb01a531803e8f779d92b5b9d17dc
1 #include "http.h"
2 #include "pack.h"
3 #include "sideband.h"
4 #include "run-command.h"
5 #include "url.h"
6 #include "credential.h"
7 #include "version.h"
8 #include "exec_cmd.h"
9
10 int active_requests;
11 int http_is_verbose;
12 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
13
14 #if LIBCURL_VERSION_NUM >= 0x070a06
15 #define LIBCURL_CAN_HANDLE_AUTH_ANY
16 #endif
17
18 static int min_curl_sessions = 1;
19 static int curl_session_count;
20 #ifdef USE_CURL_MULTI
21 static int max_requests = -1;
22 static CURLM *curlm;
23 #endif
24 #ifndef NO_CURL_EASY_DUPHANDLE
25 static CURL *curl_default;
26 #endif
27
28 #define PREV_BUF_SIZE 4096
29 #define RANGE_HEADER_SIZE 30
30
31 char curl_errorstr[CURL_ERROR_SIZE];
32
33 static int curl_ssl_verify = -1;
34 static const char *ssl_cert;
35 #if LIBCURL_VERSION_NUM >= 0x070903
36 static const char *ssl_key;
37 #endif
38 #if LIBCURL_VERSION_NUM >= 0x070908
39 static const char *ssl_capath;
40 #endif
41 static const char *ssl_cainfo;
42 static long curl_low_speed_limit = -1;
43 static long curl_low_speed_time = -1;
44 static int curl_ftp_no_epsv;
45 static const char *curl_http_proxy;
46 static const char *curl_cookie_file;
47 static struct credential http_auth = CREDENTIAL_INIT;
48 static int http_proactive_auth;
49 static const char *user_agent;
50
51 #if LIBCURL_VERSION_NUM >= 0x071700
52 /* Use CURLOPT_KEYPASSWD as is */
53 #elif LIBCURL_VERSION_NUM >= 0x070903
54 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
55 #else
56 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
57 #endif
58
59 static struct credential cert_auth = CREDENTIAL_INIT;
60 static int ssl_cert_password_required;
61
62 static struct curl_slist *pragma_header;
63 static struct curl_slist *no_pragma_header;
64
65 static struct active_request_slot *active_queue_head;
66
67 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
68 {
69 size_t size = eltsize * nmemb;
70 struct buffer *buffer = buffer_;
71
72 if (size > buffer->buf.len - buffer->posn)
73 size = buffer->buf.len - buffer->posn;
74 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
75 buffer->posn += size;
76
77 return size;
78 }
79
80 #ifndef NO_CURL_IOCTL
81 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
82 {
83 struct buffer *buffer = clientp;
84
85 switch (cmd) {
86 case CURLIOCMD_NOP:
87 return CURLIOE_OK;
88
89 case CURLIOCMD_RESTARTREAD:
90 buffer->posn = 0;
91 return CURLIOE_OK;
92
93 default:
94 return CURLIOE_UNKNOWNCMD;
95 }
96 }
97 #endif
98
99 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
100 {
101 size_t size = eltsize * nmemb;
102 struct strbuf *buffer = buffer_;
103
104 strbuf_add(buffer, ptr, size);
105 return size;
106 }
107
108 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
109 {
110 return eltsize * nmemb;
111 }
112
113 #ifdef USE_CURL_MULTI
114 static void process_curl_messages(void)
115 {
116 int num_messages;
117 struct active_request_slot *slot;
118 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
119
120 while (curl_message != NULL) {
121 if (curl_message->msg == CURLMSG_DONE) {
122 int curl_result = curl_message->data.result;
123 slot = active_queue_head;
124 while (slot != NULL &&
125 slot->curl != curl_message->easy_handle)
126 slot = slot->next;
127 if (slot != NULL) {
128 curl_multi_remove_handle(curlm, slot->curl);
129 slot->curl_result = curl_result;
130 finish_active_slot(slot);
131 } else {
132 fprintf(stderr, "Received DONE message for unknown request!\n");
133 }
134 } else {
135 fprintf(stderr, "Unknown CURL message received: %d\n",
136 (int)curl_message->msg);
137 }
138 curl_message = curl_multi_info_read(curlm, &num_messages);
139 }
140 }
141 #endif
142
143 static int git_config_path(const char **result,
144 const char *var, const char *value)
145 {
146 if (git_config_string(result, var, value))
147 return 1;
148 #ifdef __MINGW32__
149 if (**result == '/')
150 *result = system_path((*result) + 1);
151 #endif
152 return 0;
153 }
154
155 static int http_options(const char *var, const char *value, void *cb)
156 {
157 if (!strcmp("http.sslverify", var)) {
158 curl_ssl_verify = git_config_bool(var, value);
159 return 0;
160 }
161 if (!strcmp("http.sslcert", var))
162 return git_config_path(&ssl_cert, var, value);
163 #if LIBCURL_VERSION_NUM >= 0x070903
164 if (!strcmp("http.sslkey", var))
165 return git_config_path(&ssl_key, var, value);
166 #endif
167 #if LIBCURL_VERSION_NUM >= 0x070908
168 if (!strcmp("http.sslcapath", var))
169 return git_config_path(&ssl_capath, var, value);
170 #endif
171 if (!strcmp("http.sslcainfo", var))
172 return git_config_path(&ssl_cainfo, var, value);
173 if (!strcmp("http.sslcertpasswordprotected", var)) {
174 if (git_config_bool(var, value))
175 ssl_cert_password_required = 1;
176 return 0;
177 }
178 if (!strcmp("http.minsessions", var)) {
179 min_curl_sessions = git_config_int(var, value);
180 #ifndef USE_CURL_MULTI
181 if (min_curl_sessions > 1)
182 min_curl_sessions = 1;
183 #endif
184 return 0;
185 }
186 #ifdef USE_CURL_MULTI
187 if (!strcmp("http.maxrequests", var)) {
188 max_requests = git_config_int(var, value);
189 return 0;
190 }
191 #endif
192 if (!strcmp("http.lowspeedlimit", var)) {
193 curl_low_speed_limit = (long)git_config_int(var, value);
194 return 0;
195 }
196 if (!strcmp("http.lowspeedtime", var)) {
197 curl_low_speed_time = (long)git_config_int(var, value);
198 return 0;
199 }
200
201 if (!strcmp("http.noepsv", var)) {
202 curl_ftp_no_epsv = git_config_bool(var, value);
203 return 0;
204 }
205 if (!strcmp("http.proxy", var))
206 return git_config_string(&curl_http_proxy, var, value);
207
208 if (!strcmp("http.cookiefile", var))
209 return git_config_string(&curl_cookie_file, var, value);
210
211 if (!strcmp("http.postbuffer", var)) {
212 http_post_buffer = git_config_int(var, value);
213 if (http_post_buffer < LARGE_PACKET_MAX)
214 http_post_buffer = LARGE_PACKET_MAX;
215 return 0;
216 }
217
218 if (!strcmp("http.useragent", var))
219 return git_config_string(&user_agent, var, value);
220
221 /* Fall back on the default ones */
222 return git_default_config(var, value, cb);
223 }
224
225 static void init_curl_http_auth(CURL *result)
226 {
227 if (!http_auth.username)
228 return;
229
230 credential_fill(&http_auth);
231
232 #if LIBCURL_VERSION_NUM >= 0x071301
233 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
234 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
235 #else
236 {
237 static struct strbuf up = STRBUF_INIT;
238 strbuf_reset(&up);
239 strbuf_addf(&up, "%s:%s",
240 http_auth.username, http_auth.password);
241 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
242 }
243 #endif
244 }
245
246 static int has_cert_password(void)
247 {
248 if (ssl_cert == NULL || ssl_cert_password_required != 1)
249 return 0;
250 if (!cert_auth.password) {
251 cert_auth.protocol = xstrdup("cert");
252 cert_auth.username = xstrdup("");
253 cert_auth.path = xstrdup(ssl_cert);
254 credential_fill(&cert_auth);
255 }
256 return 1;
257 }
258
259 static CURL *get_curl_handle(void)
260 {
261 CURL *result = curl_easy_init();
262
263 if (!curl_ssl_verify) {
264 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
265 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
266 } else {
267 /* Verify authenticity of the peer's certificate */
268 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
269 /* The name in the cert must match whom we tried to connect */
270 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
271 }
272
273 #if LIBCURL_VERSION_NUM >= 0x070907
274 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
275 #endif
276 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
277 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
278 #endif
279
280 if (http_proactive_auth)
281 init_curl_http_auth(result);
282
283 if (ssl_cert != NULL)
284 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
285 if (has_cert_password())
286 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
287 #if LIBCURL_VERSION_NUM >= 0x070903
288 if (ssl_key != NULL)
289 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
290 #endif
291 #if LIBCURL_VERSION_NUM >= 0x070908
292 if (ssl_capath != NULL)
293 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
294 #endif
295 if (ssl_cainfo != NULL)
296 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
297 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
298
299 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
300 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
301 curl_low_speed_limit);
302 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
303 curl_low_speed_time);
304 }
305
306 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
307 #if LIBCURL_VERSION_NUM >= 0x071301
308 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
309 #elif LIBCURL_VERSION_NUM >= 0x071101
310 curl_easy_setopt(result, CURLOPT_POST301, 1);
311 #endif
312
313 if (getenv("GIT_CURL_VERBOSE"))
314 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
315
316 curl_easy_setopt(result, CURLOPT_USERAGENT,
317 user_agent ? user_agent : git_user_agent());
318
319 if (curl_ftp_no_epsv)
320 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
321
322 if (curl_http_proxy) {
323 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
324 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
325 }
326
327 return result;
328 }
329
330 static void set_from_env(const char **var, const char *envname)
331 {
332 const char *val = getenv(envname);
333 if (val)
334 *var = val;
335 }
336
337 void http_init(struct remote *remote, const char *url, int proactive_auth)
338 {
339 char *low_speed_limit;
340 char *low_speed_time;
341
342 http_is_verbose = 0;
343
344 git_config(http_options, NULL);
345
346 curl_global_init(CURL_GLOBAL_ALL);
347
348 http_proactive_auth = proactive_auth;
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 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
383
384 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
385 if (low_speed_limit != NULL)
386 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
387 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
388 if (low_speed_time != NULL)
389 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
390
391 if (curl_ssl_verify == -1)
392 curl_ssl_verify = 1;
393
394 curl_session_count = 0;
395 #ifdef USE_CURL_MULTI
396 if (max_requests < 1)
397 max_requests = DEFAULT_MAX_REQUESTS;
398 #endif
399
400 if (getenv("GIT_CURL_FTP_NO_EPSV"))
401 curl_ftp_no_epsv = 1;
402
403 if (url) {
404 credential_from_url(&http_auth, url);
405 if (!ssl_cert_password_required &&
406 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
407 !prefixcmp(url, "https://"))
408 ssl_cert_password_required = 1;
409 }
410
411 #ifndef NO_CURL_EASY_DUPHANDLE
412 curl_default = get_curl_handle();
413 #endif
414 }
415
416 void http_cleanup(void)
417 {
418 struct active_request_slot *slot = active_queue_head;
419
420 while (slot != NULL) {
421 struct active_request_slot *next = slot->next;
422 if (slot->curl != NULL) {
423 #ifdef USE_CURL_MULTI
424 curl_multi_remove_handle(curlm, slot->curl);
425 #endif
426 curl_easy_cleanup(slot->curl);
427 }
428 free(slot);
429 slot = next;
430 }
431 active_queue_head = NULL;
432
433 #ifndef NO_CURL_EASY_DUPHANDLE
434 curl_easy_cleanup(curl_default);
435 #endif
436
437 #ifdef USE_CURL_MULTI
438 curl_multi_cleanup(curlm);
439 #endif
440 curl_global_cleanup();
441
442 curl_slist_free_all(pragma_header);
443 pragma_header = NULL;
444
445 curl_slist_free_all(no_pragma_header);
446 no_pragma_header = NULL;
447
448 if (curl_http_proxy) {
449 free((void *)curl_http_proxy);
450 curl_http_proxy = NULL;
451 }
452
453 if (cert_auth.password != NULL) {
454 memset(cert_auth.password, 0, strlen(cert_auth.password));
455 free(cert_auth.password);
456 cert_auth.password = NULL;
457 }
458 ssl_cert_password_required = 0;
459 }
460
461 struct active_request_slot *get_active_slot(void)
462 {
463 struct active_request_slot *slot = active_queue_head;
464 struct active_request_slot *newslot;
465
466 #ifdef USE_CURL_MULTI
467 int num_transfers;
468
469 /* Wait for a slot to open up if the queue is full */
470 while (active_requests >= max_requests) {
471 curl_multi_perform(curlm, &num_transfers);
472 if (num_transfers < active_requests)
473 process_curl_messages();
474 }
475 #endif
476
477 while (slot != NULL && slot->in_use)
478 slot = slot->next;
479
480 if (slot == NULL) {
481 newslot = xmalloc(sizeof(*newslot));
482 newslot->curl = NULL;
483 newslot->in_use = 0;
484 newslot->next = NULL;
485
486 slot = active_queue_head;
487 if (slot == NULL) {
488 active_queue_head = newslot;
489 } else {
490 while (slot->next != NULL)
491 slot = slot->next;
492 slot->next = newslot;
493 }
494 slot = newslot;
495 }
496
497 if (slot->curl == NULL) {
498 #ifdef NO_CURL_EASY_DUPHANDLE
499 slot->curl = get_curl_handle();
500 #else
501 slot->curl = curl_easy_duphandle(curl_default);
502 #endif
503 curl_session_count++;
504 }
505
506 active_requests++;
507 slot->in_use = 1;
508 slot->results = NULL;
509 slot->finished = NULL;
510 slot->callback_data = NULL;
511 slot->callback_func = NULL;
512 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
513 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
514 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
515 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
516 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
517 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
518 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
519 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
520 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
521 if (http_auth.password)
522 init_curl_http_auth(slot->curl);
523
524 return slot;
525 }
526
527 int start_active_slot(struct active_request_slot *slot)
528 {
529 #ifdef USE_CURL_MULTI
530 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
531 int num_transfers;
532
533 if (curlm_result != CURLM_OK &&
534 curlm_result != CURLM_CALL_MULTI_PERFORM) {
535 active_requests--;
536 slot->in_use = 0;
537 return 0;
538 }
539
540 /*
541 * We know there must be something to do, since we just added
542 * something.
543 */
544 curl_multi_perform(curlm, &num_transfers);
545 #endif
546 return 1;
547 }
548
549 #ifdef USE_CURL_MULTI
550 struct fill_chain {
551 void *data;
552 int (*fill)(void *);
553 struct fill_chain *next;
554 };
555
556 static struct fill_chain *fill_cfg;
557
558 void add_fill_function(void *data, int (*fill)(void *))
559 {
560 struct fill_chain *new = xmalloc(sizeof(*new));
561 struct fill_chain **linkp = &fill_cfg;
562 new->data = data;
563 new->fill = fill;
564 new->next = NULL;
565 while (*linkp)
566 linkp = &(*linkp)->next;
567 *linkp = new;
568 }
569
570 void fill_active_slots(void)
571 {
572 struct active_request_slot *slot = active_queue_head;
573
574 while (active_requests < max_requests) {
575 struct fill_chain *fill;
576 for (fill = fill_cfg; fill; fill = fill->next)
577 if (fill->fill(fill->data))
578 break;
579
580 if (!fill)
581 break;
582 }
583
584 while (slot != NULL) {
585 if (!slot->in_use && slot->curl != NULL
586 && curl_session_count > min_curl_sessions) {
587 curl_easy_cleanup(slot->curl);
588 slot->curl = NULL;
589 curl_session_count--;
590 }
591 slot = slot->next;
592 }
593 }
594
595 void step_active_slots(void)
596 {
597 int num_transfers;
598 CURLMcode curlm_result;
599
600 do {
601 curlm_result = curl_multi_perform(curlm, &num_transfers);
602 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
603 if (num_transfers < active_requests) {
604 process_curl_messages();
605 fill_active_slots();
606 }
607 }
608 #endif
609
610 void run_active_slot(struct active_request_slot *slot)
611 {
612 #ifdef USE_CURL_MULTI
613 fd_set readfds;
614 fd_set writefds;
615 fd_set excfds;
616 int max_fd;
617 struct timeval select_timeout;
618 int finished = 0;
619
620 slot->finished = &finished;
621 while (!finished) {
622 step_active_slots();
623
624 if (slot->in_use) {
625 #if LIBCURL_VERSION_NUM >= 0x070f04
626 long curl_timeout;
627 curl_multi_timeout(curlm, &curl_timeout);
628 if (curl_timeout == 0) {
629 continue;
630 } else if (curl_timeout == -1) {
631 select_timeout.tv_sec = 0;
632 select_timeout.tv_usec = 50000;
633 } else {
634 select_timeout.tv_sec = curl_timeout / 1000;
635 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
636 }
637 #else
638 select_timeout.tv_sec = 0;
639 select_timeout.tv_usec = 50000;
640 #endif
641
642 max_fd = -1;
643 FD_ZERO(&readfds);
644 FD_ZERO(&writefds);
645 FD_ZERO(&excfds);
646 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
647
648 /*
649 * It can happen that curl_multi_timeout returns a pathologically
650 * long timeout when curl_multi_fdset returns no file descriptors
651 * to read. See commit message for more details.
652 */
653 if (max_fd < 0 &&
654 (select_timeout.tv_sec > 0 ||
655 select_timeout.tv_usec > 50000)) {
656 select_timeout.tv_sec = 0;
657 select_timeout.tv_usec = 50000;
658 }
659
660 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
661 }
662 }
663 #else
664 while (slot->in_use) {
665 slot->curl_result = curl_easy_perform(slot->curl);
666 finish_active_slot(slot);
667 }
668 #endif
669 }
670
671 static void closedown_active_slot(struct active_request_slot *slot)
672 {
673 active_requests--;
674 slot->in_use = 0;
675 }
676
677 static void release_active_slot(struct active_request_slot *slot)
678 {
679 closedown_active_slot(slot);
680 if (slot->curl && curl_session_count > min_curl_sessions) {
681 #ifdef USE_CURL_MULTI
682 curl_multi_remove_handle(curlm, slot->curl);
683 #endif
684 curl_easy_cleanup(slot->curl);
685 slot->curl = NULL;
686 curl_session_count--;
687 }
688 #ifdef USE_CURL_MULTI
689 fill_active_slots();
690 #endif
691 }
692
693 void finish_active_slot(struct active_request_slot *slot)
694 {
695 closedown_active_slot(slot);
696 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
697
698 if (slot->finished != NULL)
699 (*slot->finished) = 1;
700
701 /* Store slot results so they can be read after the slot is reused */
702 if (slot->results != NULL) {
703 slot->results->curl_result = slot->curl_result;
704 slot->results->http_code = slot->http_code;
705 }
706
707 /* Run callback if appropriate */
708 if (slot->callback_func != NULL)
709 slot->callback_func(slot->callback_data);
710 }
711
712 void finish_all_active_slots(void)
713 {
714 struct active_request_slot *slot = active_queue_head;
715
716 while (slot != NULL)
717 if (slot->in_use) {
718 run_active_slot(slot);
719 slot = active_queue_head;
720 } else {
721 slot = slot->next;
722 }
723 }
724
725 /* Helpers for modifying and creating URLs */
726 static inline int needs_quote(int ch)
727 {
728 if (((ch >= 'A') && (ch <= 'Z'))
729 || ((ch >= 'a') && (ch <= 'z'))
730 || ((ch >= '0') && (ch <= '9'))
731 || (ch == '/')
732 || (ch == '-')
733 || (ch == '.'))
734 return 0;
735 return 1;
736 }
737
738 static char *quote_ref_url(const char *base, const char *ref)
739 {
740 struct strbuf buf = STRBUF_INIT;
741 const char *cp;
742 int ch;
743
744 end_url_with_slash(&buf, base);
745
746 for (cp = ref; (ch = *cp) != 0; cp++)
747 if (needs_quote(ch))
748 strbuf_addf(&buf, "%%%02x", ch);
749 else
750 strbuf_addch(&buf, *cp);
751
752 return strbuf_detach(&buf, NULL);
753 }
754
755 void append_remote_object_url(struct strbuf *buf, const char *url,
756 const char *hex,
757 int only_two_digit_prefix)
758 {
759 end_url_with_slash(buf, url);
760
761 strbuf_addf(buf, "objects/%.*s/", 2, hex);
762 if (!only_two_digit_prefix)
763 strbuf_addf(buf, "%s", hex+2);
764 }
765
766 char *get_remote_object_url(const char *url, const char *hex,
767 int only_two_digit_prefix)
768 {
769 struct strbuf buf = STRBUF_INIT;
770 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
771 return strbuf_detach(&buf, NULL);
772 }
773
774 int handle_curl_result(struct slot_results *results)
775 {
776 if (results->curl_result == CURLE_OK) {
777 credential_approve(&http_auth);
778 return HTTP_OK;
779 } else if (missing_target(results))
780 return HTTP_MISSING_TARGET;
781 else if (results->http_code == 401) {
782 if (http_auth.username && http_auth.password) {
783 credential_reject(&http_auth);
784 return HTTP_NOAUTH;
785 } else {
786 credential_fill(&http_auth);
787 return HTTP_REAUTH;
788 }
789 } else {
790 #if LIBCURL_VERSION_NUM >= 0x070c00
791 if (!curl_errorstr[0])
792 strlcpy(curl_errorstr,
793 curl_easy_strerror(results->curl_result),
794 sizeof(curl_errorstr));
795 #endif
796 return HTTP_ERROR;
797 }
798 }
799
800 /* http_request() targets */
801 #define HTTP_REQUEST_STRBUF 0
802 #define HTTP_REQUEST_FILE 1
803
804 static int http_request(const char *url, void *result, int target, int options)
805 {
806 struct active_request_slot *slot;
807 struct slot_results results;
808 struct curl_slist *headers = NULL;
809 struct strbuf buf = STRBUF_INIT;
810 int ret;
811
812 slot = get_active_slot();
813 slot->results = &results;
814 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
815
816 if (result == NULL) {
817 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
818 } else {
819 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
820 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
821
822 if (target == HTTP_REQUEST_FILE) {
823 long posn = ftell(result);
824 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
825 fwrite);
826 if (posn > 0) {
827 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
828 headers = curl_slist_append(headers, buf.buf);
829 strbuf_reset(&buf);
830 }
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 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
845
846 if (start_active_slot(slot)) {
847 run_active_slot(slot);
848 ret = handle_curl_result(&results);
849 } else {
850 error("Unable to start HTTP request for %s", url);
851 ret = HTTP_START_FAILED;
852 }
853
854 curl_slist_free_all(headers);
855 strbuf_release(&buf);
856
857 return ret;
858 }
859
860 static int http_request_reauth(const char *url, void *result, int target,
861 int options)
862 {
863 int ret = http_request(url, result, target, options);
864 if (ret != HTTP_REAUTH)
865 return ret;
866 return http_request(url, result, target, options);
867 }
868
869 int http_get_strbuf(const char *url, struct strbuf *result, int options)
870 {
871 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
872 }
873
874 /*
875 * Downloads a URL and stores the result in the given file.
876 *
877 * If a previous interrupted download is detected (i.e. a previous temporary
878 * file is still around) the download is resumed.
879 */
880 static int http_get_file(const char *url, const char *filename, int options)
881 {
882 int ret;
883 struct strbuf tmpfile = STRBUF_INIT;
884 FILE *result;
885
886 strbuf_addf(&tmpfile, "%s.temp", filename);
887 result = fopen(tmpfile.buf, "a");
888 if (! result) {
889 error("Unable to open local file %s", tmpfile.buf);
890 ret = HTTP_ERROR;
891 goto cleanup;
892 }
893
894 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
895 fclose(result);
896
897 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
898 ret = HTTP_ERROR;
899 cleanup:
900 strbuf_release(&tmpfile);
901 return ret;
902 }
903
904 int http_error(const char *url, int ret)
905 {
906 /* http_request has already handled HTTP_START_FAILED. */
907 if (ret != HTTP_START_FAILED)
908 error("%s while accessing %s", curl_errorstr, url);
909
910 return ret;
911 }
912
913 int http_fetch_ref(const char *base, struct ref *ref)
914 {
915 char *url;
916 struct strbuf buffer = STRBUF_INIT;
917 int ret = -1;
918
919 url = quote_ref_url(base, ref->name);
920 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
921 strbuf_rtrim(&buffer);
922 if (buffer.len == 40)
923 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
924 else if (!prefixcmp(buffer.buf, "ref: ")) {
925 ref->symref = xstrdup(buffer.buf + 5);
926 ret = 0;
927 }
928 }
929
930 strbuf_release(&buffer);
931 free(url);
932 return ret;
933 }
934
935 /* Helpers for fetching packs */
936 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
937 {
938 char *url, *tmp;
939 struct strbuf buf = STRBUF_INIT;
940
941 if (http_is_verbose)
942 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
943
944 end_url_with_slash(&buf, base_url);
945 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
946 url = strbuf_detach(&buf, NULL);
947
948 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
949 tmp = strbuf_detach(&buf, NULL);
950
951 if (http_get_file(url, tmp, 0) != HTTP_OK) {
952 error("Unable to get pack index %s", url);
953 free(tmp);
954 tmp = NULL;
955 }
956
957 free(url);
958 return tmp;
959 }
960
961 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
962 unsigned char *sha1, const char *base_url)
963 {
964 struct packed_git *new_pack;
965 char *tmp_idx = NULL;
966 int ret;
967
968 if (has_pack_index(sha1)) {
969 new_pack = parse_pack_index(sha1, NULL);
970 if (!new_pack)
971 return -1; /* parse_pack_index() already issued error message */
972 goto add_pack;
973 }
974
975 tmp_idx = fetch_pack_index(sha1, base_url);
976 if (!tmp_idx)
977 return -1;
978
979 new_pack = parse_pack_index(sha1, tmp_idx);
980 if (!new_pack) {
981 unlink(tmp_idx);
982 free(tmp_idx);
983
984 return -1; /* parse_pack_index() already issued error message */
985 }
986
987 ret = verify_pack_index(new_pack);
988 if (!ret) {
989 close_pack_index(new_pack);
990 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
991 }
992 free(tmp_idx);
993 if (ret)
994 return -1;
995
996 add_pack:
997 new_pack->next = *packs_head;
998 *packs_head = new_pack;
999 return 0;
1000 }
1001
1002 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1003 {
1004 int ret = 0, i = 0;
1005 char *url, *data;
1006 struct strbuf buf = STRBUF_INIT;
1007 unsigned char sha1[20];
1008
1009 end_url_with_slash(&buf, base_url);
1010 strbuf_addstr(&buf, "objects/info/packs");
1011 url = strbuf_detach(&buf, NULL);
1012
1013 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1014 if (ret != HTTP_OK)
1015 goto cleanup;
1016
1017 data = buf.buf;
1018 while (i < buf.len) {
1019 switch (data[i]) {
1020 case 'P':
1021 i++;
1022 if (i + 52 <= buf.len &&
1023 !prefixcmp(data + i, " pack-") &&
1024 !prefixcmp(data + i + 46, ".pack\n")) {
1025 get_sha1_hex(data + i + 6, sha1);
1026 fetch_and_setup_pack_index(packs_head, sha1,
1027 base_url);
1028 i += 51;
1029 break;
1030 }
1031 default:
1032 while (i < buf.len && data[i] != '\n')
1033 i++;
1034 }
1035 i++;
1036 }
1037
1038 cleanup:
1039 free(url);
1040 return ret;
1041 }
1042
1043 void release_http_pack_request(struct http_pack_request *preq)
1044 {
1045 if (preq->packfile != NULL) {
1046 fclose(preq->packfile);
1047 preq->packfile = NULL;
1048 }
1049 if (preq->range_header != NULL) {
1050 curl_slist_free_all(preq->range_header);
1051 preq->range_header = NULL;
1052 }
1053 preq->slot = NULL;
1054 free(preq->url);
1055 }
1056
1057 int finish_http_pack_request(struct http_pack_request *preq)
1058 {
1059 struct packed_git **lst;
1060 struct packed_git *p = preq->target;
1061 char *tmp_idx;
1062 struct child_process ip;
1063 const char *ip_argv[8];
1064
1065 close_pack_index(p);
1066
1067 fclose(preq->packfile);
1068 preq->packfile = NULL;
1069
1070 lst = preq->lst;
1071 while (*lst != p)
1072 lst = &((*lst)->next);
1073 *lst = (*lst)->next;
1074
1075 tmp_idx = xstrdup(preq->tmpfile);
1076 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1077 ".idx.temp");
1078
1079 ip_argv[0] = "index-pack";
1080 ip_argv[1] = "-o";
1081 ip_argv[2] = tmp_idx;
1082 ip_argv[3] = preq->tmpfile;
1083 ip_argv[4] = NULL;
1084
1085 memset(&ip, 0, sizeof(ip));
1086 ip.argv = ip_argv;
1087 ip.git_cmd = 1;
1088 ip.no_stdin = 1;
1089 ip.no_stdout = 1;
1090
1091 if (run_command(&ip)) {
1092 unlink(preq->tmpfile);
1093 unlink(tmp_idx);
1094 free(tmp_idx);
1095 return -1;
1096 }
1097
1098 unlink(sha1_pack_index_name(p->sha1));
1099
1100 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1101 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1102 free(tmp_idx);
1103 return -1;
1104 }
1105
1106 install_packed_git(p);
1107 free(tmp_idx);
1108 return 0;
1109 }
1110
1111 struct http_pack_request *new_http_pack_request(
1112 struct packed_git *target, const char *base_url)
1113 {
1114 long prev_posn = 0;
1115 char range[RANGE_HEADER_SIZE];
1116 struct strbuf buf = STRBUF_INIT;
1117 struct http_pack_request *preq;
1118
1119 preq = xcalloc(1, sizeof(*preq));
1120 preq->target = target;
1121
1122 end_url_with_slash(&buf, base_url);
1123 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1124 sha1_to_hex(target->sha1));
1125 preq->url = strbuf_detach(&buf, NULL);
1126
1127 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1128 sha1_pack_name(target->sha1));
1129 preq->packfile = fopen(preq->tmpfile, "a");
1130 if (!preq->packfile) {
1131 error("Unable to open local file %s for pack",
1132 preq->tmpfile);
1133 goto abort;
1134 }
1135
1136 preq->slot = get_active_slot();
1137 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1138 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1139 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1140 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1141 no_pragma_header);
1142
1143 /*
1144 * If there is data present from a previous transfer attempt,
1145 * resume where it left off
1146 */
1147 prev_posn = ftell(preq->packfile);
1148 if (prev_posn>0) {
1149 if (http_is_verbose)
1150 fprintf(stderr,
1151 "Resuming fetch of pack %s at byte %ld\n",
1152 sha1_to_hex(target->sha1), prev_posn);
1153 sprintf(range, "Range: bytes=%ld-", prev_posn);
1154 preq->range_header = curl_slist_append(NULL, range);
1155 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1156 preq->range_header);
1157 }
1158
1159 return preq;
1160
1161 abort:
1162 free(preq->url);
1163 free(preq);
1164 return NULL;
1165 }
1166
1167 /* Helpers for fetching objects (loose) */
1168 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1169 void *data)
1170 {
1171 unsigned char expn[4096];
1172 size_t size = eltsize * nmemb;
1173 int posn = 0;
1174 struct http_object_request *freq =
1175 (struct http_object_request *)data;
1176 do {
1177 ssize_t retval = xwrite(freq->localfile,
1178 (char *) ptr + posn, size - posn);
1179 if (retval < 0)
1180 return posn;
1181 posn += retval;
1182 } while (posn < size);
1183
1184 freq->stream.avail_in = size;
1185 freq->stream.next_in = (void *)ptr;
1186 do {
1187 freq->stream.next_out = expn;
1188 freq->stream.avail_out = sizeof(expn);
1189 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1190 git_SHA1_Update(&freq->c, expn,
1191 sizeof(expn) - freq->stream.avail_out);
1192 } while (freq->stream.avail_in && freq->zret == Z_OK);
1193 return size;
1194 }
1195
1196 struct http_object_request *new_http_object_request(const char *base_url,
1197 unsigned char *sha1)
1198 {
1199 char *hex = sha1_to_hex(sha1);
1200 char *filename;
1201 char prevfile[PATH_MAX];
1202 int prevlocal;
1203 char prev_buf[PREV_BUF_SIZE];
1204 ssize_t prev_read = 0;
1205 long prev_posn = 0;
1206 char range[RANGE_HEADER_SIZE];
1207 struct curl_slist *range_header = NULL;
1208 struct http_object_request *freq;
1209
1210 freq = xcalloc(1, sizeof(*freq));
1211 hashcpy(freq->sha1, sha1);
1212 freq->localfile = -1;
1213
1214 filename = sha1_file_name(sha1);
1215 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1216 "%s.temp", filename);
1217
1218 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1219 unlink_or_warn(prevfile);
1220 rename(freq->tmpfile, prevfile);
1221 unlink_or_warn(freq->tmpfile);
1222
1223 if (freq->localfile != -1)
1224 error("fd leakage in start: %d", freq->localfile);
1225 freq->localfile = open(freq->tmpfile,
1226 O_WRONLY | O_CREAT | O_EXCL, 0666);
1227 /*
1228 * This could have failed due to the "lazy directory creation";
1229 * try to mkdir the last path component.
1230 */
1231 if (freq->localfile < 0 && errno == ENOENT) {
1232 char *dir = strrchr(freq->tmpfile, '/');
1233 if (dir) {
1234 *dir = 0;
1235 mkdir(freq->tmpfile, 0777);
1236 *dir = '/';
1237 }
1238 freq->localfile = open(freq->tmpfile,
1239 O_WRONLY | O_CREAT | O_EXCL, 0666);
1240 }
1241
1242 if (freq->localfile < 0) {
1243 error("Couldn't create temporary file %s: %s",
1244 freq->tmpfile, strerror(errno));
1245 goto abort;
1246 }
1247
1248 git_inflate_init(&freq->stream);
1249
1250 git_SHA1_Init(&freq->c);
1251
1252 freq->url = get_remote_object_url(base_url, hex, 0);
1253
1254 /*
1255 * If a previous temp file is present, process what was already
1256 * fetched.
1257 */
1258 prevlocal = open(prevfile, O_RDONLY);
1259 if (prevlocal != -1) {
1260 do {
1261 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1262 if (prev_read>0) {
1263 if (fwrite_sha1_file(prev_buf,
1264 1,
1265 prev_read,
1266 freq) == prev_read) {
1267 prev_posn += prev_read;
1268 } else {
1269 prev_read = -1;
1270 }
1271 }
1272 } while (prev_read > 0);
1273 close(prevlocal);
1274 }
1275 unlink_or_warn(prevfile);
1276
1277 /*
1278 * Reset inflate/SHA1 if there was an error reading the previous temp
1279 * file; also rewind to the beginning of the local file.
1280 */
1281 if (prev_read == -1) {
1282 memset(&freq->stream, 0, sizeof(freq->stream));
1283 git_inflate_init(&freq->stream);
1284 git_SHA1_Init(&freq->c);
1285 if (prev_posn>0) {
1286 prev_posn = 0;
1287 lseek(freq->localfile, 0, SEEK_SET);
1288 if (ftruncate(freq->localfile, 0) < 0) {
1289 error("Couldn't truncate temporary file %s: %s",
1290 freq->tmpfile, strerror(errno));
1291 goto abort;
1292 }
1293 }
1294 }
1295
1296 freq->slot = get_active_slot();
1297
1298 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1299 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1300 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1301 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1302 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1303
1304 /*
1305 * If we have successfully processed data from a previous fetch
1306 * attempt, only fetch the data we don't already have.
1307 */
1308 if (prev_posn>0) {
1309 if (http_is_verbose)
1310 fprintf(stderr,
1311 "Resuming fetch of object %s at byte %ld\n",
1312 hex, prev_posn);
1313 sprintf(range, "Range: bytes=%ld-", prev_posn);
1314 range_header = curl_slist_append(range_header, range);
1315 curl_easy_setopt(freq->slot->curl,
1316 CURLOPT_HTTPHEADER, range_header);
1317 }
1318
1319 return freq;
1320
1321 abort:
1322 free(freq->url);
1323 free(freq);
1324 return NULL;
1325 }
1326
1327 void process_http_object_request(struct http_object_request *freq)
1328 {
1329 if (freq->slot == NULL)
1330 return;
1331 freq->curl_result = freq->slot->curl_result;
1332 freq->http_code = freq->slot->http_code;
1333 freq->slot = NULL;
1334 }
1335
1336 int finish_http_object_request(struct http_object_request *freq)
1337 {
1338 struct stat st;
1339
1340 close(freq->localfile);
1341 freq->localfile = -1;
1342
1343 process_http_object_request(freq);
1344
1345 if (freq->http_code == 416) {
1346 warning("requested range invalid; we may already have all the data.");
1347 } else if (freq->curl_result != CURLE_OK) {
1348 if (stat(freq->tmpfile, &st) == 0)
1349 if (st.st_size == 0)
1350 unlink_or_warn(freq->tmpfile);
1351 return -1;
1352 }
1353
1354 git_inflate_end(&freq->stream);
1355 git_SHA1_Final(freq->real_sha1, &freq->c);
1356 if (freq->zret != Z_STREAM_END) {
1357 unlink_or_warn(freq->tmpfile);
1358 return -1;
1359 }
1360 if (hashcmp(freq->sha1, freq->real_sha1)) {
1361 unlink_or_warn(freq->tmpfile);
1362 return -1;
1363 }
1364 freq->rename =
1365 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1366
1367 return freq->rename;
1368 }
1369
1370 void abort_http_object_request(struct http_object_request *freq)
1371 {
1372 unlink_or_warn(freq->tmpfile);
1373
1374 release_http_object_request(freq);
1375 }
1376
1377 void release_http_object_request(struct http_object_request *freq)
1378 {
1379 if (freq->localfile != -1) {
1380 close(freq->localfile);
1381 freq->localfile = -1;
1382 }
1383 if (freq->url != NULL) {
1384 free(freq->url);
1385 freq->url = NULL;
1386 }
1387 if (freq->slot != NULL) {
1388 freq->slot->callback_func = NULL;
1389 freq->slot->callback_data = NULL;
1390 release_active_slot(freq->slot);
1391 freq->slot = NULL;
1392 }
1393 }
The MinGW fork, forked for msysGit