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http.c: Rely on select instead of tracking whether data was received
[git.git] / http.c
blob2083efe71ea9cd6b137652743d22fbc095b42c2a
1 #include "http.h"
2 #include "pack.h"
3 #include "sideband.h"
4 #include "run-command.h"
5 #include "url.h"
6
7 int active_requests;
8 int http_is_verbose;
9 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
10
11 #if LIBCURL_VERSION_NUM >= 0x070a06
12 #define LIBCURL_CAN_HANDLE_AUTH_ANY
13 #endif
14
15 static int min_curl_sessions = 1;
16 static int curl_session_count;
17 #ifdef USE_CURL_MULTI
18 static int max_requests = -1;
19 static CURLM *curlm;
20 #endif
21 #ifndef NO_CURL_EASY_DUPHANDLE
22 static CURL *curl_default;
23 #endif
24
25 #define PREV_BUF_SIZE 4096
26 #define RANGE_HEADER_SIZE 30
27
28 char curl_errorstr[CURL_ERROR_SIZE];
29
30 static int curl_ssl_verify = -1;
31 static const char *ssl_cert;
32 #if LIBCURL_VERSION_NUM >= 0x070903
33 static const char *ssl_key;
34 #endif
35 #if LIBCURL_VERSION_NUM >= 0x070908
36 static const char *ssl_capath;
37 #endif
38 static const char *ssl_cainfo;
39 static long curl_low_speed_limit = -1;
40 static long curl_low_speed_time = -1;
41 static int curl_ftp_no_epsv;
42 static const char *curl_http_proxy;
43 static char *user_name, *user_pass;
44 static const char *user_agent;
45
46 #if LIBCURL_VERSION_NUM >= 0x071700
47 /* Use CURLOPT_KEYPASSWD as is */
48 #elif LIBCURL_VERSION_NUM >= 0x070903
49 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
50 #else
51 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
52 #endif
53
54 static char *ssl_cert_password;
55 static int ssl_cert_password_required;
56
57 static struct curl_slist *pragma_header;
58 static struct curl_slist *no_pragma_header;
59
60 static struct active_request_slot *active_queue_head;
61
62 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
63 {
64 size_t size = eltsize * nmemb;
65 struct buffer *buffer = buffer_;
66
67 if (size > buffer->buf.len - buffer->posn)
68 size = buffer->buf.len - buffer->posn;
69 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
70 buffer->posn += size;
71
72 return size;
73 }
74
75 #ifndef NO_CURL_IOCTL
76 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
77 {
78 struct buffer *buffer = clientp;
79
80 switch (cmd) {
81 case CURLIOCMD_NOP:
82 return CURLIOE_OK;
83
84 case CURLIOCMD_RESTARTREAD:
85 buffer->posn = 0;
86 return CURLIOE_OK;
87
88 default:
89 return CURLIOE_UNKNOWNCMD;
90 }
91 }
92 #endif
93
94 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
95 {
96 size_t size = eltsize * nmemb;
97 struct strbuf *buffer = buffer_;
98
99 strbuf_add(buffer, ptr, size);
100 return size;
101 }
102
103 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
104 {
105 return eltsize * nmemb;
106 }
107
108 #ifdef USE_CURL_MULTI
109 static void process_curl_messages(void)
110 {
111 int num_messages;
112 struct active_request_slot *slot;
113 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
114
115 while (curl_message != NULL) {
116 if (curl_message->msg == CURLMSG_DONE) {
117 int curl_result = curl_message->data.result;
118 slot = active_queue_head;
119 while (slot != NULL &&
120 slot->curl != curl_message->easy_handle)
121 slot = slot->next;
122 if (slot != NULL) {
123 curl_multi_remove_handle(curlm, slot->curl);
124 slot->curl_result = curl_result;
125 finish_active_slot(slot);
126 } else {
127 fprintf(stderr, "Received DONE message for unknown request!\n");
128 }
129 } else {
130 fprintf(stderr, "Unknown CURL message received: %d\n",
131 (int)curl_message->msg);
132 }
133 curl_message = curl_multi_info_read(curlm, &num_messages);
134 }
135 }
136 #endif
137
138 static int http_options(const char *var, const char *value, void *cb)
139 {
140 if (!strcmp("http.sslverify", var)) {
141 curl_ssl_verify = git_config_bool(var, value);
142 return 0;
143 }
144 if (!strcmp("http.sslcert", var))
145 return git_config_string(&ssl_cert, var, value);
146 #if LIBCURL_VERSION_NUM >= 0x070903
147 if (!strcmp("http.sslkey", var))
148 return git_config_string(&ssl_key, var, value);
149 #endif
150 #if LIBCURL_VERSION_NUM >= 0x070908
151 if (!strcmp("http.sslcapath", var))
152 return git_config_string(&ssl_capath, var, value);
153 #endif
154 if (!strcmp("http.sslcainfo", var))
155 return git_config_string(&ssl_cainfo, var, value);
156 if (!strcmp("http.sslcertpasswordprotected", var)) {
157 if (git_config_bool(var, value))
158 ssl_cert_password_required = 1;
159 return 0;
160 }
161 if (!strcmp("http.minsessions", var)) {
162 min_curl_sessions = git_config_int(var, value);
163 #ifndef USE_CURL_MULTI
164 if (min_curl_sessions > 1)
165 min_curl_sessions = 1;
166 #endif
167 return 0;
168 }
169 #ifdef USE_CURL_MULTI
170 if (!strcmp("http.maxrequests", var)) {
171 max_requests = git_config_int(var, value);
172 return 0;
173 }
174 #endif
175 if (!strcmp("http.lowspeedlimit", var)) {
176 curl_low_speed_limit = (long)git_config_int(var, value);
177 return 0;
178 }
179 if (!strcmp("http.lowspeedtime", var)) {
180 curl_low_speed_time = (long)git_config_int(var, value);
181 return 0;
182 }
183
184 if (!strcmp("http.noepsv", var)) {
185 curl_ftp_no_epsv = git_config_bool(var, value);
186 return 0;
187 }
188 if (!strcmp("http.proxy", var))
189 return git_config_string(&curl_http_proxy, var, value);
190
191 if (!strcmp("http.postbuffer", var)) {
192 http_post_buffer = git_config_int(var, value);
193 if (http_post_buffer < LARGE_PACKET_MAX)
194 http_post_buffer = LARGE_PACKET_MAX;
195 return 0;
196 }
197
198 if (!strcmp("http.useragent", var))
199 return git_config_string(&user_agent, var, value);
200
201 /* Fall back on the default ones */
202 return git_default_config(var, value, cb);
203 }
204
205 static void init_curl_http_auth(CURL *result)
206 {
207 if (user_name) {
208 struct strbuf up = STRBUF_INIT;
209 if (!user_pass)
210 user_pass = xstrdup(git_getpass("Password: "));
211 strbuf_addf(&up, "%s:%s", user_name, user_pass);
212 curl_easy_setopt(result, CURLOPT_USERPWD,
213 strbuf_detach(&up, NULL));
214 }
215 }
216
217 static int has_cert_password(void)
218 {
219 if (ssl_cert_password != NULL)
220 return 1;
221 if (ssl_cert == NULL || ssl_cert_password_required != 1)
222 return 0;
223 /* Only prompt the user once. */
224 ssl_cert_password_required = -1;
225 ssl_cert_password = git_getpass("Certificate Password: ");
226 if (ssl_cert_password != NULL) {
227 ssl_cert_password = xstrdup(ssl_cert_password);
228 return 1;
229 } else
230 return 0;
231 }
232
233 static CURL *get_curl_handle(void)
234 {
235 CURL *result = curl_easy_init();
236
237 if (!curl_ssl_verify) {
238 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
239 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
240 } else {
241 /* Verify authenticity of the peer's certificate */
242 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
243 /* The name in the cert must match whom we tried to connect */
244 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
245 }
246
247 #if LIBCURL_VERSION_NUM >= 0x070907
248 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
249 #endif
250 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
251 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
252 #endif
253
254 init_curl_http_auth(result);
255
256 if (ssl_cert != NULL)
257 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
258 if (has_cert_password())
259 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
260 #if LIBCURL_VERSION_NUM >= 0x070903
261 if (ssl_key != NULL)
262 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
263 #endif
264 #if LIBCURL_VERSION_NUM >= 0x070908
265 if (ssl_capath != NULL)
266 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
267 #endif
268 if (ssl_cainfo != NULL)
269 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
270 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
271
272 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
273 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
274 curl_low_speed_limit);
275 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
276 curl_low_speed_time);
277 }
278
279 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
280 #if LIBCURL_VERSION_NUM >= 0x071301
281 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
282 #elif LIBCURL_VERSION_NUM >= 0x071101
283 curl_easy_setopt(result, CURLOPT_POST301, 1);
284 #endif
285
286 if (getenv("GIT_CURL_VERBOSE"))
287 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
288
289 curl_easy_setopt(result, CURLOPT_USERAGENT,
290 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
291
292 if (curl_ftp_no_epsv)
293 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
294
295 if (curl_http_proxy)
296 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
297
298 return result;
299 }
300
301 static void http_auth_init(const char *url)
302 {
303 char *at, *colon, *cp, *slash, *decoded;
304 int len;
305
306 cp = strstr(url, "://");
307 if (!cp)
308 return;
309
310 /*
311 * Ok, the URL looks like "proto://something". Which one?
312 * "proto://<user>:<pass>@<host>/...",
313 * "proto://<user>@<host>/...", or just
314 * "proto://<host>/..."?
315 */
316 cp += 3;
317 at = strchr(cp, '@');
318 colon = strchr(cp, ':');
319 slash = strchrnul(cp, '/');
320 if (!at || slash <= at)
321 return; /* No credentials */
322 if (!colon || at <= colon) {
323 /* Only username */
324 len = at - cp;
325 user_name = xmalloc(len + 1);
326 memcpy(user_name, cp, len);
327 user_name[len] = '\0';
328 decoded = url_decode(user_name);
329 free(user_name);
330 user_name = decoded;
331 user_pass = NULL;
332 } else {
333 len = colon - cp;
334 user_name = xmalloc(len + 1);
335 memcpy(user_name, cp, len);
336 user_name[len] = '\0';
337 decoded = url_decode(user_name);
338 free(user_name);
339 user_name = decoded;
340 len = at - (colon + 1);
341 user_pass = xmalloc(len + 1);
342 memcpy(user_pass, colon + 1, len);
343 user_pass[len] = '\0';
344 decoded = url_decode(user_pass);
345 free(user_pass);
346 user_pass = decoded;
347 }
348 }
349
350 static void set_from_env(const char **var, const char *envname)
351 {
352 const char *val = getenv(envname);
353 if (val)
354 *var = val;
355 }
356
357 void http_init(struct remote *remote)
358 {
359 char *low_speed_limit;
360 char *low_speed_time;
361
362 http_is_verbose = 0;
363
364 git_config(http_options, NULL);
365
366 curl_global_init(CURL_GLOBAL_ALL);
367
368 if (remote && remote->http_proxy)
369 curl_http_proxy = xstrdup(remote->http_proxy);
370
371 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
372 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
373
374 #ifdef USE_CURL_MULTI
375 {
376 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
377 if (http_max_requests != NULL)
378 max_requests = atoi(http_max_requests);
379 }
380
381 curlm = curl_multi_init();
382 if (curlm == NULL) {
383 fprintf(stderr, "Error creating curl multi handle.\n");
384 exit(1);
385 }
386 #endif
387
388 if (getenv("GIT_SSL_NO_VERIFY"))
389 curl_ssl_verify = 0;
390
391 set_from_env(&ssl_cert, "GIT_SSL_CERT");
392 #if LIBCURL_VERSION_NUM >= 0x070903
393 set_from_env(&ssl_key, "GIT_SSL_KEY");
394 #endif
395 #if LIBCURL_VERSION_NUM >= 0x070908
396 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
397 #endif
398 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
399
400 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
401
402 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
403 if (low_speed_limit != NULL)
404 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
405 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
406 if (low_speed_time != NULL)
407 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
408
409 if (curl_ssl_verify == -1)
410 curl_ssl_verify = 1;
411
412 curl_session_count = 0;
413 #ifdef USE_CURL_MULTI
414 if (max_requests < 1)
415 max_requests = DEFAULT_MAX_REQUESTS;
416 #endif
417
418 if (getenv("GIT_CURL_FTP_NO_EPSV"))
419 curl_ftp_no_epsv = 1;
420
421 if (remote && remote->url && remote->url[0]) {
422 http_auth_init(remote->url[0]);
423 if (!ssl_cert_password_required &&
424 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
425 !prefixcmp(remote->url[0], "https://"))
426 ssl_cert_password_required = 1;
427 }
428
429 #ifndef NO_CURL_EASY_DUPHANDLE
430 curl_default = get_curl_handle();
431 #endif
432 }
433
434 void http_cleanup(void)
435 {
436 struct active_request_slot *slot = active_queue_head;
437
438 while (slot != NULL) {
439 struct active_request_slot *next = slot->next;
440 if (slot->curl != NULL) {
441 #ifdef USE_CURL_MULTI
442 curl_multi_remove_handle(curlm, slot->curl);
443 #endif
444 curl_easy_cleanup(slot->curl);
445 }
446 free(slot);
447 slot = next;
448 }
449 active_queue_head = NULL;
450
451 #ifndef NO_CURL_EASY_DUPHANDLE
452 curl_easy_cleanup(curl_default);
453 #endif
454
455 #ifdef USE_CURL_MULTI
456 curl_multi_cleanup(curlm);
457 #endif
458 curl_global_cleanup();
459
460 curl_slist_free_all(pragma_header);
461 pragma_header = NULL;
462
463 curl_slist_free_all(no_pragma_header);
464 no_pragma_header = NULL;
465
466 if (curl_http_proxy) {
467 free((void *)curl_http_proxy);
468 curl_http_proxy = NULL;
469 }
470
471 if (ssl_cert_password != NULL) {
472 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
473 free(ssl_cert_password);
474 ssl_cert_password = NULL;
475 }
476 ssl_cert_password_required = 0;
477 }
478
479 struct active_request_slot *get_active_slot(void)
480 {
481 struct active_request_slot *slot = active_queue_head;
482 struct active_request_slot *newslot;
483
484 #ifdef USE_CURL_MULTI
485 int num_transfers;
486
487 /* Wait for a slot to open up if the queue is full */
488 while (active_requests >= max_requests) {
489 curl_multi_perform(curlm, &num_transfers);
490 if (num_transfers < active_requests)
491 process_curl_messages();
492 }
493 #endif
494
495 while (slot != NULL && slot->in_use)
496 slot = slot->next;
497
498 if (slot == NULL) {
499 newslot = xmalloc(sizeof(*newslot));
500 newslot->curl = NULL;
501 newslot->in_use = 0;
502 newslot->next = NULL;
503
504 slot = active_queue_head;
505 if (slot == NULL) {
506 active_queue_head = newslot;
507 } else {
508 while (slot->next != NULL)
509 slot = slot->next;
510 slot->next = newslot;
511 }
512 slot = newslot;
513 }
514
515 if (slot->curl == NULL) {
516 #ifdef NO_CURL_EASY_DUPHANDLE
517 slot->curl = get_curl_handle();
518 #else
519 slot->curl = curl_easy_duphandle(curl_default);
520 #endif
521 curl_session_count++;
522 }
523
524 active_requests++;
525 slot->in_use = 1;
526 slot->local = NULL;
527 slot->results = NULL;
528 slot->finished = NULL;
529 slot->callback_data = NULL;
530 slot->callback_func = NULL;
531 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
532 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
533 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
534 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
535 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
536 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
537 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
538 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
539
540 return slot;
541 }
542
543 int start_active_slot(struct active_request_slot *slot)
544 {
545 #ifdef USE_CURL_MULTI
546 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
547 int num_transfers;
548
549 if (curlm_result != CURLM_OK &&
550 curlm_result != CURLM_CALL_MULTI_PERFORM) {
551 active_requests--;
552 slot->in_use = 0;
553 return 0;
554 }
555
556 /*
557 * We know there must be something to do, since we just added
558 * something.
559 */
560 curl_multi_perform(curlm, &num_transfers);
561 #endif
562 return 1;
563 }
564
565 #ifdef USE_CURL_MULTI
566 struct fill_chain {
567 void *data;
568 int (*fill)(void *);
569 struct fill_chain *next;
570 };
571
572 static struct fill_chain *fill_cfg;
573
574 void add_fill_function(void *data, int (*fill)(void *))
575 {
576 struct fill_chain *new = xmalloc(sizeof(*new));
577 struct fill_chain **linkp = &fill_cfg;
578 new->data = data;
579 new->fill = fill;
580 new->next = NULL;
581 while (*linkp)
582 linkp = &(*linkp)->next;
583 *linkp = new;
584 }
585
586 void fill_active_slots(void)
587 {
588 struct active_request_slot *slot = active_queue_head;
589
590 while (active_requests < max_requests) {
591 struct fill_chain *fill;
592 for (fill = fill_cfg; fill; fill = fill->next)
593 if (fill->fill(fill->data))
594 break;
595
596 if (!fill)
597 break;
598 }
599
600 while (slot != NULL) {
601 if (!slot->in_use && slot->curl != NULL
602 && curl_session_count > min_curl_sessions) {
603 curl_easy_cleanup(slot->curl);
604 slot->curl = NULL;
605 curl_session_count--;
606 }
607 slot = slot->next;
608 }
609 }
610
611 void step_active_slots(void)
612 {
613 int num_transfers;
614 CURLMcode curlm_result;
615
616 do {
617 curlm_result = curl_multi_perform(curlm, &num_transfers);
618 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
619 if (num_transfers < active_requests) {
620 process_curl_messages();
621 fill_active_slots();
622 }
623 }
624 #endif
625
626 void run_active_slot(struct active_request_slot *slot)
627 {
628 #ifdef USE_CURL_MULTI
629 fd_set readfds;
630 fd_set writefds;
631 fd_set excfds;
632 int max_fd;
633 struct timeval select_timeout;
634 int finished = 0;
635
636 slot->finished = &finished;
637 while (!finished) {
638 step_active_slots();
639
640 if (slot->in_use) {
641 #if LIBCURL_VERSION_NUM >= 0x070f04
642 long curl_timeout;
643 curl_multi_timeout(curlm, &curl_timeout);
644 if (curl_timeout == 0) {
645 continue;
646 } else if (curl_timeout == -1) {
647 select_timeout.tv_sec = 0;
648 select_timeout.tv_usec = 50000;
649 } else {
650 select_timeout.tv_sec = curl_timeout / 1000;
651 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
652 }
653 #else
654 select_timeout.tv_sec = 0;
655 select_timeout.tv_usec = 50000;
656 #endif
657
658 max_fd = -1;
659 FD_ZERO(&readfds);
660 FD_ZERO(&writefds);
661 FD_ZERO(&excfds);
662 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
663
664 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
665 }
666 }
667 #else
668 while (slot->in_use) {
669 slot->curl_result = curl_easy_perform(slot->curl);
670 finish_active_slot(slot);
671 }
672 #endif
673 }
674
675 static void closedown_active_slot(struct active_request_slot *slot)
676 {
677 active_requests--;
678 slot->in_use = 0;
679 }
680
681 static void release_active_slot(struct active_request_slot *slot)
682 {
683 closedown_active_slot(slot);
684 if (slot->curl && curl_session_count > min_curl_sessions) {
685 #ifdef USE_CURL_MULTI
686 curl_multi_remove_handle(curlm, slot->curl);
687 #endif
688 curl_easy_cleanup(slot->curl);
689 slot->curl = NULL;
690 curl_session_count--;
691 }
692 #ifdef USE_CURL_MULTI
693 fill_active_slots();
694 #endif
695 }
696
697 void finish_active_slot(struct active_request_slot *slot)
698 {
699 closedown_active_slot(slot);
700 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
701
702 if (slot->finished != NULL)
703 (*slot->finished) = 1;
704
705 /* Store slot results so they can be read after the slot is reused */
706 if (slot->results != NULL) {
707 slot->results->curl_result = slot->curl_result;
708 slot->results->http_code = slot->http_code;
709 }
710
711 /* Run callback if appropriate */
712 if (slot->callback_func != NULL)
713 slot->callback_func(slot->callback_data);
714 }
715
716 void finish_all_active_slots(void)
717 {
718 struct active_request_slot *slot = active_queue_head;
719
720 while (slot != NULL)
721 if (slot->in_use) {
722 run_active_slot(slot);
723 slot = active_queue_head;
724 } else {
725 slot = slot->next;
726 }
727 }
728
729 /* Helpers for modifying and creating URLs */
730 static inline int needs_quote(int ch)
731 {
732 if (((ch >= 'A') && (ch <= 'Z'))
733 || ((ch >= 'a') && (ch <= 'z'))
734 || ((ch >= '0') && (ch <= '9'))
735 || (ch == '/')
736 || (ch == '-')
737 || (ch == '.'))
738 return 0;
739 return 1;
740 }
741
742 static inline int hex(int v)
743 {
744 if (v < 10)
745 return '0' + v;
746 else
747 return 'A' + v - 10;
748 }
749
750 static char *quote_ref_url(const char *base, const char *ref)
751 {
752 struct strbuf buf = STRBUF_INIT;
753 const char *cp;
754 int ch;
755
756 end_url_with_slash(&buf, base);
757
758 for (cp = ref; (ch = *cp) != 0; cp++)
759 if (needs_quote(ch))
760 strbuf_addf(&buf, "%%%02x", ch);
761 else
762 strbuf_addch(&buf, *cp);
763
764 return strbuf_detach(&buf, NULL);
765 }
766
767 void append_remote_object_url(struct strbuf *buf, const char *url,
768 const char *hex,
769 int only_two_digit_prefix)
770 {
771 end_url_with_slash(buf, url);
772
773 strbuf_addf(buf, "objects/%.*s/", 2, hex);
774 if (!only_two_digit_prefix)
775 strbuf_addf(buf, "%s", hex+2);
776 }
777
778 char *get_remote_object_url(const char *url, const char *hex,
779 int only_two_digit_prefix)
780 {
781 struct strbuf buf = STRBUF_INIT;
782 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
783 return strbuf_detach(&buf, NULL);
784 }
785
786 /* http_request() targets */
787 #define HTTP_REQUEST_STRBUF 0
788 #define HTTP_REQUEST_FILE 1
789
790 static int http_request(const char *url, void *result, int target, int options)
791 {
792 struct active_request_slot *slot;
793 struct slot_results results;
794 struct curl_slist *headers = NULL;
795 struct strbuf buf = STRBUF_INIT;
796 int ret;
797
798 slot = get_active_slot();
799 slot->results = &results;
800 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
801
802 if (result == NULL) {
803 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
804 } else {
805 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
806 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
807
808 if (target == HTTP_REQUEST_FILE) {
809 long posn = ftell(result);
810 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
811 fwrite);
812 if (posn > 0) {
813 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
814 headers = curl_slist_append(headers, buf.buf);
815 strbuf_reset(&buf);
816 }
817 slot->local = result;
818 } else
819 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
820 fwrite_buffer);
821 }
822
823 strbuf_addstr(&buf, "Pragma:");
824 if (options & HTTP_NO_CACHE)
825 strbuf_addstr(&buf, " no-cache");
826
827 headers = curl_slist_append(headers, buf.buf);
828
829 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
830 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
831
832 if (start_active_slot(slot)) {
833 run_active_slot(slot);
834 if (results.curl_result == CURLE_OK)
835 ret = HTTP_OK;
836 else if (missing_target(&results))
837 ret = HTTP_MISSING_TARGET;
838 else if (results.http_code == 401) {
839 if (user_name) {
840 ret = HTTP_NOAUTH;
841 } else {
842 /*
843 * git_getpass is needed here because its very likely stdin/stdout are
844 * pipes to our parent process. So we instead need to use /dev/tty,
845 * but that is non-portable. Using git_getpass() can at least be stubbed
846 * on other platforms with a different implementation if/when necessary.
847 */
848 user_name = xstrdup(git_getpass("Username: "));
849 init_curl_http_auth(slot->curl);
850 ret = HTTP_REAUTH;
851 }
852 } else
853 ret = HTTP_ERROR;
854 } else {
855 error("Unable to start HTTP request for %s", url);
856 ret = HTTP_START_FAILED;
857 }
858
859 slot->local = NULL;
860 curl_slist_free_all(headers);
861 strbuf_release(&buf);
862
863 return ret;
864 }
865
866 int http_get_strbuf(const char *url, struct strbuf *result, int options)
867 {
868 int http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
869 if (http_ret == HTTP_REAUTH) {
870 http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
871 }
872 return http_ret;
873 }
874
875 /*
876 * Downloads an url and stores the result in the given file.
877 *
878 * If a previous interrupted download is detected (i.e. a previous temporary
879 * file is still around) the download is resumed.
880 */
881 static int http_get_file(const char *url, const char *filename, int options)
882 {
883 int ret;
884 struct strbuf tmpfile = STRBUF_INIT;
885 FILE *result;
886
887 strbuf_addf(&tmpfile, "%s.temp", filename);
888 result = fopen(tmpfile.buf, "a");
889 if (! result) {
890 error("Unable to open local file %s", tmpfile.buf);
891 ret = HTTP_ERROR;
892 goto cleanup;
893 }
894
895 ret = http_request(url, result, HTTP_REQUEST_FILE, options);
896 fclose(result);
897
898 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
899 ret = HTTP_ERROR;
900 cleanup:
901 strbuf_release(&tmpfile);
902 return ret;
903 }
904
905 int http_error(const char *url, int ret)
906 {
907 /* http_request has already handled HTTP_START_FAILED. */
908 if (ret != HTTP_START_FAILED)
909 error("%s while accessing %s\n", curl_errorstr, url);
910
911 return ret;
912 }
913
914 int http_fetch_ref(const char *base, struct ref *ref)
915 {
916 char *url;
917 struct strbuf buffer = STRBUF_INIT;
918 int ret = -1;
919
920 url = quote_ref_url(base, ref->name);
921 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
922 strbuf_rtrim(&buffer);
923 if (buffer.len == 40)
924 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
925 else if (!prefixcmp(buffer.buf, "ref: ")) {
926 ref->symref = xstrdup(buffer.buf + 5);
927 ret = 0;
928 }
929 }
930
931 strbuf_release(&buffer);
932 free(url);
933 return ret;
934 }
935
936 /* Helpers for fetching packs */
937 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
938 {
939 char *url, *tmp;
940 struct strbuf buf = STRBUF_INIT;
941
942 if (http_is_verbose)
943 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
944
945 end_url_with_slash(&buf, base_url);
946 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
947 url = strbuf_detach(&buf, NULL);
948
949 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
950 tmp = strbuf_detach(&buf, NULL);
951
952 if (http_get_file(url, tmp, 0) != HTTP_OK) {
953 error("Unable to get pack index %s\n", url);
954 free(tmp);
955 tmp = NULL;
956 }
957
958 free(url);
959 return tmp;
960 }
961
962 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
963 unsigned char *sha1, const char *base_url)
964 {
965 struct packed_git *new_pack;
966 char *tmp_idx = NULL;
967 int ret;
968
969 if (has_pack_index(sha1)) {
970 new_pack = parse_pack_index(sha1, NULL);
971 if (!new_pack)
972 return -1; /* parse_pack_index() already issued error message */
973 goto add_pack;
974 }
975
976 tmp_idx = fetch_pack_index(sha1, base_url);
977 if (!tmp_idx)
978 return -1;
979
980 new_pack = parse_pack_index(sha1, tmp_idx);
981 if (!new_pack) {
982 unlink(tmp_idx);
983 free(tmp_idx);
984
985 return -1; /* parse_pack_index() already issued error message */
986 }
987
988 ret = verify_pack_index(new_pack);
989 if (!ret) {
990 close_pack_index(new_pack);
991 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
992 }
993 free(tmp_idx);
994 if (ret)
995 return -1;
996
997 add_pack:
998 new_pack->next = *packs_head;
999 *packs_head = new_pack;
1000 return 0;
1001 }
1002
1003 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1004 {
1005 int ret = 0, i = 0;
1006 char *url, *data;
1007 struct strbuf buf = STRBUF_INIT;
1008 unsigned char sha1[20];
1009
1010 end_url_with_slash(&buf, base_url);
1011 strbuf_addstr(&buf, "objects/info/packs");
1012 url = strbuf_detach(&buf, NULL);
1013
1014 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1015 if (ret != HTTP_OK)
1016 goto cleanup;
1017
1018 data = buf.buf;
1019 while (i < buf.len) {
1020 switch (data[i]) {
1021 case 'P':
1022 i++;
1023 if (i + 52 <= buf.len &&
1024 !prefixcmp(data + i, " pack-") &&
1025 !prefixcmp(data + i + 46, ".pack\n")) {
1026 get_sha1_hex(data + i + 6, sha1);
1027 fetch_and_setup_pack_index(packs_head, sha1,
1028 base_url);
1029 i += 51;
1030 break;
1031 }
1032 default:
1033 while (i < buf.len && data[i] != '\n')
1034 i++;
1035 }
1036 i++;
1037 }
1038
1039 cleanup:
1040 free(url);
1041 return ret;
1042 }
1043
1044 void release_http_pack_request(struct http_pack_request *preq)
1045 {
1046 if (preq->packfile != NULL) {
1047 fclose(preq->packfile);
1048 preq->packfile = NULL;
1049 preq->slot->local = NULL;
1050 }
1051 if (preq->range_header != NULL) {
1052 curl_slist_free_all(preq->range_header);
1053 preq->range_header = NULL;
1054 }
1055 preq->slot = NULL;
1056 free(preq->url);
1057 }
1058
1059 int finish_http_pack_request(struct http_pack_request *preq)
1060 {
1061 struct packed_git **lst;
1062 struct packed_git *p = preq->target;
1063 char *tmp_idx;
1064 struct child_process ip;
1065 const char *ip_argv[8];
1066
1067 close_pack_index(p);
1068
1069 fclose(preq->packfile);
1070 preq->packfile = NULL;
1071 preq->slot->local = NULL;
1072
1073 lst = preq->lst;
1074 while (*lst != p)
1075 lst = &((*lst)->next);
1076 *lst = (*lst)->next;
1077
1078 tmp_idx = xstrdup(preq->tmpfile);
1079 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1080 ".idx.temp");
1081
1082 ip_argv[0] = "index-pack";
1083 ip_argv[1] = "-o";
1084 ip_argv[2] = tmp_idx;
1085 ip_argv[3] = preq->tmpfile;
1086 ip_argv[4] = NULL;
1087
1088 memset(&ip, 0, sizeof(ip));
1089 ip.argv = ip_argv;
1090 ip.git_cmd = 1;
1091 ip.no_stdin = 1;
1092 ip.no_stdout = 1;
1093
1094 if (run_command(&ip)) {
1095 unlink(preq->tmpfile);
1096 unlink(tmp_idx);
1097 free(tmp_idx);
1098 return -1;
1099 }
1100
1101 unlink(sha1_pack_index_name(p->sha1));
1102
1103 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1104 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1105 free(tmp_idx);
1106 return -1;
1107 }
1108
1109 install_packed_git(p);
1110 free(tmp_idx);
1111 return 0;
1112 }
1113
1114 struct http_pack_request *new_http_pack_request(
1115 struct packed_git *target, const char *base_url)
1116 {
1117 long prev_posn = 0;
1118 char range[RANGE_HEADER_SIZE];
1119 struct strbuf buf = STRBUF_INIT;
1120 struct http_pack_request *preq;
1121
1122 preq = xmalloc(sizeof(*preq));
1123 preq->target = target;
1124 preq->range_header = NULL;
1125
1126 end_url_with_slash(&buf, base_url);
1127 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1128 sha1_to_hex(target->sha1));
1129 preq->url = strbuf_detach(&buf, NULL);
1130
1131 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1132 sha1_pack_name(target->sha1));
1133 preq->packfile = fopen(preq->tmpfile, "a");
1134 if (!preq->packfile) {
1135 error("Unable to open local file %s for pack",
1136 preq->tmpfile);
1137 goto abort;
1138 }
1139
1140 preq->slot = get_active_slot();
1141 preq->slot->local = preq->packfile;
1142 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1143 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1144 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1145 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1146 no_pragma_header);
1147
1148 /*
1149 * If there is data present from a previous transfer attempt,
1150 * resume where it left off
1151 */
1152 prev_posn = ftell(preq->packfile);
1153 if (prev_posn>0) {
1154 if (http_is_verbose)
1155 fprintf(stderr,
1156 "Resuming fetch of pack %s at byte %ld\n",
1157 sha1_to_hex(target->sha1), prev_posn);
1158 sprintf(range, "Range: bytes=%ld-", prev_posn);
1159 preq->range_header = curl_slist_append(NULL, range);
1160 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1161 preq->range_header);
1162 }
1163
1164 return preq;
1165
1166 abort:
1167 free(preq->url);
1168 free(preq);
1169 return NULL;
1170 }
1171
1172 /* Helpers for fetching objects (loose) */
1173 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1174 void *data)
1175 {
1176 unsigned char expn[4096];
1177 size_t size = eltsize * nmemb;
1178 int posn = 0;
1179 struct http_object_request *freq =
1180 (struct http_object_request *)data;
1181 do {
1182 ssize_t retval = xwrite(freq->localfile,
1183 (char *) ptr + posn, size - posn);
1184 if (retval < 0)
1185 return posn;
1186 posn += retval;
1187 } while (posn < size);
1188
1189 freq->stream.avail_in = size;
1190 freq->stream.next_in = (void *)ptr;
1191 do {
1192 freq->stream.next_out = expn;
1193 freq->stream.avail_out = sizeof(expn);
1194 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1195 git_SHA1_Update(&freq->c, expn,
1196 sizeof(expn) - freq->stream.avail_out);
1197 } while (freq->stream.avail_in && freq->zret == Z_OK);
1198 return size;
1199 }
1200
1201 struct http_object_request *new_http_object_request(const char *base_url,
1202 unsigned char *sha1)
1203 {
1204 char *hex = sha1_to_hex(sha1);
1205 char *filename;
1206 char prevfile[PATH_MAX];
1207 int prevlocal;
1208 char prev_buf[PREV_BUF_SIZE];
1209 ssize_t prev_read = 0;
1210 long prev_posn = 0;
1211 char range[RANGE_HEADER_SIZE];
1212 struct curl_slist *range_header = NULL;
1213 struct http_object_request *freq;
1214
1215 freq = xmalloc(sizeof(*freq));
1216 hashcpy(freq->sha1, sha1);
1217 freq->localfile = -1;
1218
1219 filename = sha1_file_name(sha1);
1220 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1221 "%s.temp", filename);
1222
1223 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1224 unlink_or_warn(prevfile);
1225 rename(freq->tmpfile, prevfile);
1226 unlink_or_warn(freq->tmpfile);
1227
1228 if (freq->localfile != -1)
1229 error("fd leakage in start: %d", freq->localfile);
1230 freq->localfile = open(freq->tmpfile,
1231 O_WRONLY | O_CREAT | O_EXCL, 0666);
1232 /*
1233 * This could have failed due to the "lazy directory creation";
1234 * try to mkdir the last path component.
1235 */
1236 if (freq->localfile < 0 && errno == ENOENT) {
1237 char *dir = strrchr(freq->tmpfile, '/');
1238 if (dir) {
1239 *dir = 0;
1240 mkdir(freq->tmpfile, 0777);
1241 *dir = '/';
1242 }
1243 freq->localfile = open(freq->tmpfile,
1244 O_WRONLY | O_CREAT | O_EXCL, 0666);
1245 }
1246
1247 if (freq->localfile < 0) {
1248 error("Couldn't create temporary file %s: %s",
1249 freq->tmpfile, strerror(errno));
1250 goto abort;
1251 }
1252
1253 memset(&freq->stream, 0, sizeof(freq->stream));
1254
1255 git_inflate_init(&freq->stream);
1256
1257 git_SHA1_Init(&freq->c);
1258
1259 freq->url = get_remote_object_url(base_url, hex, 0);
1260
1261 /*
1262 * If a previous temp file is present, process what was already
1263 * fetched.
1264 */
1265 prevlocal = open(prevfile, O_RDONLY);
1266 if (prevlocal != -1) {
1267 do {
1268 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1269 if (prev_read>0) {
1270 if (fwrite_sha1_file(prev_buf,
1271 1,
1272 prev_read,
1273 freq) == prev_read) {
1274 prev_posn += prev_read;
1275 } else {
1276 prev_read = -1;
1277 }
1278 }
1279 } while (prev_read > 0);
1280 close(prevlocal);
1281 }
1282 unlink_or_warn(prevfile);
1283
1284 /*
1285 * Reset inflate/SHA1 if there was an error reading the previous temp
1286 * file; also rewind to the beginning of the local file.
1287 */
1288 if (prev_read == -1) {
1289 memset(&freq->stream, 0, sizeof(freq->stream));
1290 git_inflate_init(&freq->stream);
1291 git_SHA1_Init(&freq->c);
1292 if (prev_posn>0) {
1293 prev_posn = 0;
1294 lseek(freq->localfile, 0, SEEK_SET);
1295 if (ftruncate(freq->localfile, 0) < 0) {
1296 error("Couldn't truncate temporary file %s: %s",
1297 freq->tmpfile, strerror(errno));
1298 goto abort;
1299 }
1300 }
1301 }
1302
1303 freq->slot = get_active_slot();
1304
1305 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1306 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1307 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1308 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1309 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1310
1311 /*
1312 * If we have successfully processed data from a previous fetch
1313 * attempt, only fetch the data we don't already have.
1314 */
1315 if (prev_posn>0) {
1316 if (http_is_verbose)
1317 fprintf(stderr,
1318 "Resuming fetch of object %s at byte %ld\n",
1319 hex, prev_posn);
1320 sprintf(range, "Range: bytes=%ld-", prev_posn);
1321 range_header = curl_slist_append(range_header, range);
1322 curl_easy_setopt(freq->slot->curl,
1323 CURLOPT_HTTPHEADER, range_header);
1324 }
1325
1326 return freq;
1327
1328 abort:
1329 free(filename);
1330 free(freq->url);
1331 free(freq);
1332 return NULL;
1333 }
1334
1335 void process_http_object_request(struct http_object_request *freq)
1336 {
1337 if (freq->slot == NULL)
1338 return;
1339 freq->curl_result = freq->slot->curl_result;
1340 freq->http_code = freq->slot->http_code;
1341 freq->slot = NULL;
1342 }
1343
1344 int finish_http_object_request(struct http_object_request *freq)
1345 {
1346 struct stat st;
1347
1348 close(freq->localfile);
1349 freq->localfile = -1;
1350
1351 process_http_object_request(freq);
1352
1353 if (freq->http_code == 416) {
1354 warning("requested range invalid; we may already have all the data.");
1355 } else if (freq->curl_result != CURLE_OK) {
1356 if (stat(freq->tmpfile, &st) == 0)
1357 if (st.st_size == 0)
1358 unlink_or_warn(freq->tmpfile);
1359 return -1;
1360 }
1361
1362 git_inflate_end(&freq->stream);
1363 git_SHA1_Final(freq->real_sha1, &freq->c);
1364 if (freq->zret != Z_STREAM_END) {
1365 unlink_or_warn(freq->tmpfile);
1366 return -1;
1367 }
1368 if (hashcmp(freq->sha1, freq->real_sha1)) {
1369 unlink_or_warn(freq->tmpfile);
1370 return -1;
1371 }
1372 freq->rename =
1373 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1374
1375 return freq->rename;
1376 }
1377
1378 void abort_http_object_request(struct http_object_request *freq)
1379 {
1380 unlink_or_warn(freq->tmpfile);
1381
1382 release_http_object_request(freq);
1383 }
1384
1385 void release_http_object_request(struct http_object_request *freq)
1386 {
1387 if (freq->localfile != -1) {
1388 close(freq->localfile);
1389 freq->localfile = -1;
1390 }
1391 if (freq->url != NULL) {
1392 free(freq->url);
1393 freq->url = NULL;
1394 }
1395 if (freq->slot != NULL) {
1396 freq->slot->callback_func = NULL;
1397 freq->slot->callback_data = NULL;
1398 release_active_slot(freq->slot);
1399 freq->slot = NULL;
1400 }
1401 }
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