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[git/dscho.git] / http.c
blob4da272bb5ff4d50dfa4faff375894c48207649dc
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.path = xstrdup(ssl_cert);
253 credential_fill(&cert_auth);
254 }
255 return 1;
256 }
257
258 static CURL *get_curl_handle(void)
259 {
260 CURL *result = curl_easy_init();
261
262 if (!curl_ssl_verify) {
263 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
264 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
265 } else {
266 /* Verify authenticity of the peer's certificate */
267 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
268 /* The name in the cert must match whom we tried to connect */
269 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
270 }
271
272 #if LIBCURL_VERSION_NUM >= 0x070907
273 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
274 #endif
275 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
276 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
277 #endif
278
279 if (http_proactive_auth)
280 init_curl_http_auth(result);
281
282 if (ssl_cert != NULL)
283 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
284 if (has_cert_password())
285 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
286 #if LIBCURL_VERSION_NUM >= 0x070903
287 if (ssl_key != NULL)
288 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
289 #endif
290 #if LIBCURL_VERSION_NUM >= 0x070908
291 if (ssl_capath != NULL)
292 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
293 #endif
294 if (ssl_cainfo != NULL)
295 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
296 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
297
298 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
299 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
300 curl_low_speed_limit);
301 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
302 curl_low_speed_time);
303 }
304
305 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
306 #if LIBCURL_VERSION_NUM >= 0x071301
307 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
308 #elif LIBCURL_VERSION_NUM >= 0x071101
309 curl_easy_setopt(result, CURLOPT_POST301, 1);
310 #endif
311
312 if (getenv("GIT_CURL_VERBOSE"))
313 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
314
315 curl_easy_setopt(result, CURLOPT_USERAGENT,
316 user_agent ? user_agent : git_user_agent());
317
318 if (curl_ftp_no_epsv)
319 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
320
321 if (curl_http_proxy) {
322 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
323 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
324 }
325
326 return result;
327 }
328
329 static void set_from_env(const char **var, const char *envname)
330 {
331 const char *val = getenv(envname);
332 if (val)
333 *var = val;
334 }
335
336 void http_init(struct remote *remote, const char *url, int proactive_auth)
337 {
338 char *low_speed_limit;
339 char *low_speed_time;
340
341 http_is_verbose = 0;
342
343 git_config(http_options, NULL);
344
345 curl_global_init(CURL_GLOBAL_ALL);
346
347 http_proactive_auth = proactive_auth;
348
349 if (remote && remote->http_proxy)
350 curl_http_proxy = xstrdup(remote->http_proxy);
351
352 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
353 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
354
355 #ifdef USE_CURL_MULTI
356 {
357 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
358 if (http_max_requests != NULL)
359 max_requests = atoi(http_max_requests);
360 }
361
362 curlm = curl_multi_init();
363 if (curlm == NULL) {
364 fprintf(stderr, "Error creating curl multi handle.\n");
365 exit(1);
366 }
367 #endif
368
369 if (getenv("GIT_SSL_NO_VERIFY"))
370 curl_ssl_verify = 0;
371
372 set_from_env(&ssl_cert, "GIT_SSL_CERT");
373 #if LIBCURL_VERSION_NUM >= 0x070903
374 set_from_env(&ssl_key, "GIT_SSL_KEY");
375 #endif
376 #if LIBCURL_VERSION_NUM >= 0x070908
377 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
378 #endif
379 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
380
381 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
382
383 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
384 if (low_speed_limit != NULL)
385 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
386 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
387 if (low_speed_time != NULL)
388 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
389
390 if (curl_ssl_verify == -1)
391 curl_ssl_verify = 1;
392
393 curl_session_count = 0;
394 #ifdef USE_CURL_MULTI
395 if (max_requests < 1)
396 max_requests = DEFAULT_MAX_REQUESTS;
397 #endif
398
399 if (getenv("GIT_CURL_FTP_NO_EPSV"))
400 curl_ftp_no_epsv = 1;
401
402 if (url) {
403 credential_from_url(&http_auth, url);
404 if (!ssl_cert_password_required &&
405 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
406 !prefixcmp(url, "https://"))
407 ssl_cert_password_required = 1;
408 }
409
410 #ifndef NO_CURL_EASY_DUPHANDLE
411 curl_default = get_curl_handle();
412 #endif
413 }
414
415 void http_cleanup(void)
416 {
417 struct active_request_slot *slot = active_queue_head;
418
419 while (slot != NULL) {
420 struct active_request_slot *next = slot->next;
421 if (slot->curl != NULL) {
422 #ifdef USE_CURL_MULTI
423 curl_multi_remove_handle(curlm, slot->curl);
424 #endif
425 curl_easy_cleanup(slot->curl);
426 }
427 free(slot);
428 slot = next;
429 }
430 active_queue_head = NULL;
431
432 #ifndef NO_CURL_EASY_DUPHANDLE
433 curl_easy_cleanup(curl_default);
434 #endif
435
436 #ifdef USE_CURL_MULTI
437 curl_multi_cleanup(curlm);
438 #endif
439 curl_global_cleanup();
440
441 curl_slist_free_all(pragma_header);
442 pragma_header = NULL;
443
444 curl_slist_free_all(no_pragma_header);
445 no_pragma_header = NULL;
446
447 if (curl_http_proxy) {
448 free((void *)curl_http_proxy);
449 curl_http_proxy = NULL;
450 }
451
452 if (cert_auth.password != NULL) {
453 memset(cert_auth.password, 0, strlen(cert_auth.password));
454 free(cert_auth.password);
455 cert_auth.password = NULL;
456 }
457 ssl_cert_password_required = 0;
458 }
459
460 struct active_request_slot *get_active_slot(void)
461 {
462 struct active_request_slot *slot = active_queue_head;
463 struct active_request_slot *newslot;
464
465 #ifdef USE_CURL_MULTI
466 int num_transfers;
467
468 /* Wait for a slot to open up if the queue is full */
469 while (active_requests >= max_requests) {
470 curl_multi_perform(curlm, &num_transfers);
471 if (num_transfers < active_requests)
472 process_curl_messages();
473 }
474 #endif
475
476 while (slot != NULL && slot->in_use)
477 slot = slot->next;
478
479 if (slot == NULL) {
480 newslot = xmalloc(sizeof(*newslot));
481 newslot->curl = NULL;
482 newslot->in_use = 0;
483 newslot->next = NULL;
484
485 slot = active_queue_head;
486 if (slot == NULL) {
487 active_queue_head = newslot;
488 } else {
489 while (slot->next != NULL)
490 slot = slot->next;
491 slot->next = newslot;
492 }
493 slot = newslot;
494 }
495
496 if (slot->curl == NULL) {
497 #ifdef NO_CURL_EASY_DUPHANDLE
498 slot->curl = get_curl_handle();
499 #else
500 slot->curl = curl_easy_duphandle(curl_default);
501 #endif
502 curl_session_count++;
503 }
504
505 active_requests++;
506 slot->in_use = 1;
507 slot->results = NULL;
508 slot->finished = NULL;
509 slot->callback_data = NULL;
510 slot->callback_func = NULL;
511 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
512 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
513 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
514 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
515 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
516 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
517 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
518 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
519 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
520 if (http_auth.password)
521 init_curl_http_auth(slot->curl);
522
523 return slot;
524 }
525
526 int start_active_slot(struct active_request_slot *slot)
527 {
528 #ifdef USE_CURL_MULTI
529 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
530 int num_transfers;
531
532 if (curlm_result != CURLM_OK &&
533 curlm_result != CURLM_CALL_MULTI_PERFORM) {
534 active_requests--;
535 slot->in_use = 0;
536 return 0;
537 }
538
539 /*
540 * We know there must be something to do, since we just added
541 * something.
542 */
543 curl_multi_perform(curlm, &num_transfers);
544 #endif
545 return 1;
546 }
547
548 #ifdef USE_CURL_MULTI
549 struct fill_chain {
550 void *data;
551 int (*fill)(void *);
552 struct fill_chain *next;
553 };
554
555 static struct fill_chain *fill_cfg;
556
557 void add_fill_function(void *data, int (*fill)(void *))
558 {
559 struct fill_chain *new = xmalloc(sizeof(*new));
560 struct fill_chain **linkp = &fill_cfg;
561 new->data = data;
562 new->fill = fill;
563 new->next = NULL;
564 while (*linkp)
565 linkp = &(*linkp)->next;
566 *linkp = new;
567 }
568
569 void fill_active_slots(void)
570 {
571 struct active_request_slot *slot = active_queue_head;
572
573 while (active_requests < max_requests) {
574 struct fill_chain *fill;
575 for (fill = fill_cfg; fill; fill = fill->next)
576 if (fill->fill(fill->data))
577 break;
578
579 if (!fill)
580 break;
581 }
582
583 while (slot != NULL) {
584 if (!slot->in_use && slot->curl != NULL
585 && curl_session_count > min_curl_sessions) {
586 curl_easy_cleanup(slot->curl);
587 slot->curl = NULL;
588 curl_session_count--;
589 }
590 slot = slot->next;
591 }
592 }
593
594 void step_active_slots(void)
595 {
596 int num_transfers;
597 CURLMcode curlm_result;
598
599 do {
600 curlm_result = curl_multi_perform(curlm, &num_transfers);
601 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
602 if (num_transfers < active_requests) {
603 process_curl_messages();
604 fill_active_slots();
605 }
606 }
607 #endif
608
609 void run_active_slot(struct active_request_slot *slot)
610 {
611 #ifdef USE_CURL_MULTI
612 fd_set readfds;
613 fd_set writefds;
614 fd_set excfds;
615 int max_fd;
616 struct timeval select_timeout;
617 int finished = 0;
618
619 slot->finished = &finished;
620 while (!finished) {
621 step_active_slots();
622
623 if (slot->in_use) {
624 #if LIBCURL_VERSION_NUM >= 0x070f04
625 long curl_timeout;
626 curl_multi_timeout(curlm, &curl_timeout);
627 if (curl_timeout == 0) {
628 continue;
629 } else if (curl_timeout == -1) {
630 select_timeout.tv_sec = 0;
631 select_timeout.tv_usec = 50000;
632 } else {
633 select_timeout.tv_sec = curl_timeout / 1000;
634 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
635 }
636 #else
637 select_timeout.tv_sec = 0;
638 select_timeout.tv_usec = 50000;
639 #endif
640
641 max_fd = -1;
642 FD_ZERO(&readfds);
643 FD_ZERO(&writefds);
644 FD_ZERO(&excfds);
645 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
646
647 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
648 }
649 }
650 #else
651 while (slot->in_use) {
652 slot->curl_result = curl_easy_perform(slot->curl);
653 finish_active_slot(slot);
654 }
655 #endif
656 }
657
658 static void closedown_active_slot(struct active_request_slot *slot)
659 {
660 active_requests--;
661 slot->in_use = 0;
662 }
663
664 static void release_active_slot(struct active_request_slot *slot)
665 {
666 closedown_active_slot(slot);
667 if (slot->curl && curl_session_count > min_curl_sessions) {
668 #ifdef USE_CURL_MULTI
669 curl_multi_remove_handle(curlm, slot->curl);
670 #endif
671 curl_easy_cleanup(slot->curl);
672 slot->curl = NULL;
673 curl_session_count--;
674 }
675 #ifdef USE_CURL_MULTI
676 fill_active_slots();
677 #endif
678 }
679
680 void finish_active_slot(struct active_request_slot *slot)
681 {
682 closedown_active_slot(slot);
683 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
684
685 if (slot->finished != NULL)
686 (*slot->finished) = 1;
687
688 /* Store slot results so they can be read after the slot is reused */
689 if (slot->results != NULL) {
690 slot->results->curl_result = slot->curl_result;
691 slot->results->http_code = slot->http_code;
692 }
693
694 /* Run callback if appropriate */
695 if (slot->callback_func != NULL)
696 slot->callback_func(slot->callback_data);
697 }
698
699 void finish_all_active_slots(void)
700 {
701 struct active_request_slot *slot = active_queue_head;
702
703 while (slot != NULL)
704 if (slot->in_use) {
705 run_active_slot(slot);
706 slot = active_queue_head;
707 } else {
708 slot = slot->next;
709 }
710 }
711
712 /* Helpers for modifying and creating URLs */
713 static inline int needs_quote(int ch)
714 {
715 if (((ch >= 'A') && (ch <= 'Z'))
716 || ((ch >= 'a') && (ch <= 'z'))
717 || ((ch >= '0') && (ch <= '9'))
718 || (ch == '/')
719 || (ch == '-')
720 || (ch == '.'))
721 return 0;
722 return 1;
723 }
724
725 static char *quote_ref_url(const char *base, const char *ref)
726 {
727 struct strbuf buf = STRBUF_INIT;
728 const char *cp;
729 int ch;
730
731 end_url_with_slash(&buf, base);
732
733 for (cp = ref; (ch = *cp) != 0; cp++)
734 if (needs_quote(ch))
735 strbuf_addf(&buf, "%%%02x", ch);
736 else
737 strbuf_addch(&buf, *cp);
738
739 return strbuf_detach(&buf, NULL);
740 }
741
742 void append_remote_object_url(struct strbuf *buf, const char *url,
743 const char *hex,
744 int only_two_digit_prefix)
745 {
746 end_url_with_slash(buf, url);
747
748 strbuf_addf(buf, "objects/%.*s/", 2, hex);
749 if (!only_two_digit_prefix)
750 strbuf_addf(buf, "%s", hex+2);
751 }
752
753 char *get_remote_object_url(const char *url, const char *hex,
754 int only_two_digit_prefix)
755 {
756 struct strbuf buf = STRBUF_INIT;
757 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
758 return strbuf_detach(&buf, NULL);
759 }
760
761 int handle_curl_result(struct active_request_slot *slot,
762 struct slot_results *results)
763 {
764 if (results->curl_result == CURLE_OK) {
765 credential_approve(&http_auth);
766 return HTTP_OK;
767 } else if (missing_target(results))
768 return HTTP_MISSING_TARGET;
769 else if (results->http_code == 401) {
770 if (http_auth.username && http_auth.password) {
771 credential_reject(&http_auth);
772 return HTTP_NOAUTH;
773 } else {
774 credential_fill(&http_auth);
775 init_curl_http_auth(slot->curl);
776 return HTTP_REAUTH;
777 }
778 } else {
779 #if LIBCURL_VERSION_NUM >= 0x070c00
780 if (!curl_errorstr[0])
781 strlcpy(curl_errorstr,
782 curl_easy_strerror(results->curl_result),
783 sizeof(curl_errorstr));
784 #endif
785 return HTTP_ERROR;
786 }
787 }
788
789 /* http_request() targets */
790 #define HTTP_REQUEST_STRBUF 0
791 #define HTTP_REQUEST_FILE 1
792
793 static int http_request(const char *url, void *result, int target, int options)
794 {
795 struct active_request_slot *slot;
796 struct slot_results results;
797 struct curl_slist *headers = NULL;
798 struct strbuf buf = STRBUF_INIT;
799 int ret;
800
801 slot = get_active_slot();
802 slot->results = &results;
803 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
804
805 if (result == NULL) {
806 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
807 } else {
808 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
809 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
810
811 if (target == HTTP_REQUEST_FILE) {
812 long posn = ftell(result);
813 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
814 fwrite);
815 if (posn > 0) {
816 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
817 headers = curl_slist_append(headers, buf.buf);
818 strbuf_reset(&buf);
819 }
820 } else
821 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
822 fwrite_buffer);
823 }
824
825 strbuf_addstr(&buf, "Pragma:");
826 if (options & HTTP_NO_CACHE)
827 strbuf_addstr(&buf, " no-cache");
828
829 headers = curl_slist_append(headers, buf.buf);
830
831 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
832 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
833 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
834
835 if (start_active_slot(slot)) {
836 run_active_slot(slot);
837 ret = handle_curl_result(slot, &results);
838 } else {
839 error("Unable to start HTTP request for %s", url);
840 ret = HTTP_START_FAILED;
841 }
842
843 curl_slist_free_all(headers);
844 strbuf_release(&buf);
845
846 return ret;
847 }
848
849 static int http_request_reauth(const char *url, void *result, int target,
850 int options)
851 {
852 int ret = http_request(url, result, target, options);
853 if (ret != HTTP_REAUTH)
854 return ret;
855 return http_request(url, result, target, options);
856 }
857
858 int http_get_strbuf(const char *url, struct strbuf *result, int options)
859 {
860 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
861 }
862
863 /*
864 * Downloads a URL and stores the result in the given file.
865 *
866 * If a previous interrupted download is detected (i.e. a previous temporary
867 * file is still around) the download is resumed.
868 */
869 static int http_get_file(const char *url, const char *filename, int options)
870 {
871 int ret;
872 struct strbuf tmpfile = STRBUF_INIT;
873 FILE *result;
874
875 strbuf_addf(&tmpfile, "%s.temp", filename);
876 result = fopen(tmpfile.buf, "a");
877 if (! result) {
878 error("Unable to open local file %s", tmpfile.buf);
879 ret = HTTP_ERROR;
880 goto cleanup;
881 }
882
883 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
884 fclose(result);
885
886 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
887 ret = HTTP_ERROR;
888 cleanup:
889 strbuf_release(&tmpfile);
890 return ret;
891 }
892
893 int http_error(const char *url, int ret)
894 {
895 /* http_request has already handled HTTP_START_FAILED. */
896 if (ret != HTTP_START_FAILED)
897 error("%s while accessing %s", curl_errorstr, url);
898
899 return ret;
900 }
901
902 int http_fetch_ref(const char *base, struct ref *ref)
903 {
904 char *url;
905 struct strbuf buffer = STRBUF_INIT;
906 int ret = -1;
907
908 url = quote_ref_url(base, ref->name);
909 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
910 strbuf_rtrim(&buffer);
911 if (buffer.len == 40)
912 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
913 else if (!prefixcmp(buffer.buf, "ref: ")) {
914 ref->symref = xstrdup(buffer.buf + 5);
915 ret = 0;
916 }
917 }
918
919 strbuf_release(&buffer);
920 free(url);
921 return ret;
922 }
923
924 /* Helpers for fetching packs */
925 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
926 {
927 char *url, *tmp;
928 struct strbuf buf = STRBUF_INIT;
929
930 if (http_is_verbose)
931 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
932
933 end_url_with_slash(&buf, base_url);
934 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
935 url = strbuf_detach(&buf, NULL);
936
937 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
938 tmp = strbuf_detach(&buf, NULL);
939
940 if (http_get_file(url, tmp, 0) != HTTP_OK) {
941 error("Unable to get pack index %s", url);
942 free(tmp);
943 tmp = NULL;
944 }
945
946 free(url);
947 return tmp;
948 }
949
950 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
951 unsigned char *sha1, const char *base_url)
952 {
953 struct packed_git *new_pack;
954 char *tmp_idx = NULL;
955 int ret;
956
957 if (has_pack_index(sha1)) {
958 new_pack = parse_pack_index(sha1, NULL);
959 if (!new_pack)
960 return -1; /* parse_pack_index() already issued error message */
961 goto add_pack;
962 }
963
964 tmp_idx = fetch_pack_index(sha1, base_url);
965 if (!tmp_idx)
966 return -1;
967
968 new_pack = parse_pack_index(sha1, tmp_idx);
969 if (!new_pack) {
970 unlink(tmp_idx);
971 free(tmp_idx);
972
973 return -1; /* parse_pack_index() already issued error message */
974 }
975
976 ret = verify_pack_index(new_pack);
977 if (!ret) {
978 close_pack_index(new_pack);
979 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
980 }
981 free(tmp_idx);
982 if (ret)
983 return -1;
984
985 add_pack:
986 new_pack->next = *packs_head;
987 *packs_head = new_pack;
988 return 0;
989 }
990
991 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
992 {
993 int ret = 0, i = 0;
994 char *url, *data;
995 struct strbuf buf = STRBUF_INIT;
996 unsigned char sha1[20];
997
998 end_url_with_slash(&buf, base_url);
999 strbuf_addstr(&buf, "objects/info/packs");
1000 url = strbuf_detach(&buf, NULL);
1001
1002 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1003 if (ret != HTTP_OK)
1004 goto cleanup;
1005
1006 data = buf.buf;
1007 while (i < buf.len) {
1008 switch (data[i]) {
1009 case 'P':
1010 i++;
1011 if (i + 52 <= buf.len &&
1012 !prefixcmp(data + i, " pack-") &&
1013 !prefixcmp(data + i + 46, ".pack\n")) {
1014 get_sha1_hex(data + i + 6, sha1);
1015 fetch_and_setup_pack_index(packs_head, sha1,
1016 base_url);
1017 i += 51;
1018 break;
1019 }
1020 default:
1021 while (i < buf.len && data[i] != '\n')
1022 i++;
1023 }
1024 i++;
1025 }
1026
1027 cleanup:
1028 free(url);
1029 return ret;
1030 }
1031
1032 void release_http_pack_request(struct http_pack_request *preq)
1033 {
1034 if (preq->packfile != NULL) {
1035 fclose(preq->packfile);
1036 preq->packfile = NULL;
1037 }
1038 if (preq->range_header != NULL) {
1039 curl_slist_free_all(preq->range_header);
1040 preq->range_header = NULL;
1041 }
1042 preq->slot = NULL;
1043 free(preq->url);
1044 }
1045
1046 int finish_http_pack_request(struct http_pack_request *preq)
1047 {
1048 struct packed_git **lst;
1049 struct packed_git *p = preq->target;
1050 char *tmp_idx;
1051 struct child_process ip;
1052 const char *ip_argv[8];
1053
1054 close_pack_index(p);
1055
1056 fclose(preq->packfile);
1057 preq->packfile = NULL;
1058
1059 lst = preq->lst;
1060 while (*lst != p)
1061 lst = &((*lst)->next);
1062 *lst = (*lst)->next;
1063
1064 tmp_idx = xstrdup(preq->tmpfile);
1065 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1066 ".idx.temp");
1067
1068 ip_argv[0] = "index-pack";
1069 ip_argv[1] = "-o";
1070 ip_argv[2] = tmp_idx;
1071 ip_argv[3] = preq->tmpfile;
1072 ip_argv[4] = NULL;
1073
1074 memset(&ip, 0, sizeof(ip));
1075 ip.argv = ip_argv;
1076 ip.git_cmd = 1;
1077 ip.no_stdin = 1;
1078 ip.no_stdout = 1;
1079
1080 if (run_command(&ip)) {
1081 unlink(preq->tmpfile);
1082 unlink(tmp_idx);
1083 free(tmp_idx);
1084 return -1;
1085 }
1086
1087 unlink(sha1_pack_index_name(p->sha1));
1088
1089 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1090 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1091 free(tmp_idx);
1092 return -1;
1093 }
1094
1095 install_packed_git(p);
1096 free(tmp_idx);
1097 return 0;
1098 }
1099
1100 struct http_pack_request *new_http_pack_request(
1101 struct packed_git *target, const char *base_url)
1102 {
1103 long prev_posn = 0;
1104 char range[RANGE_HEADER_SIZE];
1105 struct strbuf buf = STRBUF_INIT;
1106 struct http_pack_request *preq;
1107
1108 preq = xcalloc(1, sizeof(*preq));
1109 preq->target = target;
1110
1111 end_url_with_slash(&buf, base_url);
1112 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1113 sha1_to_hex(target->sha1));
1114 preq->url = strbuf_detach(&buf, NULL);
1115
1116 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1117 sha1_pack_name(target->sha1));
1118 preq->packfile = fopen(preq->tmpfile, "a");
1119 if (!preq->packfile) {
1120 error("Unable to open local file %s for pack",
1121 preq->tmpfile);
1122 goto abort;
1123 }
1124
1125 preq->slot = get_active_slot();
1126 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1127 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1128 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1129 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1130 no_pragma_header);
1131
1132 /*
1133 * If there is data present from a previous transfer attempt,
1134 * resume where it left off
1135 */
1136 prev_posn = ftell(preq->packfile);
1137 if (prev_posn>0) {
1138 if (http_is_verbose)
1139 fprintf(stderr,
1140 "Resuming fetch of pack %s at byte %ld\n",
1141 sha1_to_hex(target->sha1), prev_posn);
1142 sprintf(range, "Range: bytes=%ld-", prev_posn);
1143 preq->range_header = curl_slist_append(NULL, range);
1144 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1145 preq->range_header);
1146 }
1147
1148 return preq;
1149
1150 abort:
1151 free(preq->url);
1152 free(preq);
1153 return NULL;
1154 }
1155
1156 /* Helpers for fetching objects (loose) */
1157 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1158 void *data)
1159 {
1160 unsigned char expn[4096];
1161 size_t size = eltsize * nmemb;
1162 int posn = 0;
1163 struct http_object_request *freq =
1164 (struct http_object_request *)data;
1165 do {
1166 ssize_t retval = xwrite(freq->localfile,
1167 (char *) ptr + posn, size - posn);
1168 if (retval < 0)
1169 return posn;
1170 posn += retval;
1171 } while (posn < size);
1172
1173 freq->stream.avail_in = size;
1174 freq->stream.next_in = (void *)ptr;
1175 do {
1176 freq->stream.next_out = expn;
1177 freq->stream.avail_out = sizeof(expn);
1178 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1179 git_SHA1_Update(&freq->c, expn,
1180 sizeof(expn) - freq->stream.avail_out);
1181 } while (freq->stream.avail_in && freq->zret == Z_OK);
1182 return size;
1183 }
1184
1185 struct http_object_request *new_http_object_request(const char *base_url,
1186 unsigned char *sha1)
1187 {
1188 char *hex = sha1_to_hex(sha1);
1189 char *filename;
1190 char prevfile[PATH_MAX];
1191 int prevlocal;
1192 char prev_buf[PREV_BUF_SIZE];
1193 ssize_t prev_read = 0;
1194 long prev_posn = 0;
1195 char range[RANGE_HEADER_SIZE];
1196 struct curl_slist *range_header = NULL;
1197 struct http_object_request *freq;
1198
1199 freq = xcalloc(1, sizeof(*freq));
1200 hashcpy(freq->sha1, sha1);
1201 freq->localfile = -1;
1202
1203 filename = sha1_file_name(sha1);
1204 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1205 "%s.temp", filename);
1206
1207 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1208 unlink_or_warn(prevfile);
1209 rename(freq->tmpfile, prevfile);
1210 unlink_or_warn(freq->tmpfile);
1211
1212 if (freq->localfile != -1)
1213 error("fd leakage in start: %d", freq->localfile);
1214 freq->localfile = open(freq->tmpfile,
1215 O_WRONLY | O_CREAT | O_EXCL, 0666);
1216 /*
1217 * This could have failed due to the "lazy directory creation";
1218 * try to mkdir the last path component.
1219 */
1220 if (freq->localfile < 0 && errno == ENOENT) {
1221 char *dir = strrchr(freq->tmpfile, '/');
1222 if (dir) {
1223 *dir = 0;
1224 mkdir(freq->tmpfile, 0777);
1225 *dir = '/';
1226 }
1227 freq->localfile = open(freq->tmpfile,
1228 O_WRONLY | O_CREAT | O_EXCL, 0666);
1229 }
1230
1231 if (freq->localfile < 0) {
1232 error("Couldn't create temporary file %s: %s",
1233 freq->tmpfile, strerror(errno));
1234 goto abort;
1235 }
1236
1237 git_inflate_init(&freq->stream);
1238
1239 git_SHA1_Init(&freq->c);
1240
1241 freq->url = get_remote_object_url(base_url, hex, 0);
1242
1243 /*
1244 * If a previous temp file is present, process what was already
1245 * fetched.
1246 */
1247 prevlocal = open(prevfile, O_RDONLY);
1248 if (prevlocal != -1) {
1249 do {
1250 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1251 if (prev_read>0) {
1252 if (fwrite_sha1_file(prev_buf,
1253 1,
1254 prev_read,
1255 freq) == prev_read) {
1256 prev_posn += prev_read;
1257 } else {
1258 prev_read = -1;
1259 }
1260 }
1261 } while (prev_read > 0);
1262 close(prevlocal);
1263 }
1264 unlink_or_warn(prevfile);
1265
1266 /*
1267 * Reset inflate/SHA1 if there was an error reading the previous temp
1268 * file; also rewind to the beginning of the local file.
1269 */
1270 if (prev_read == -1) {
1271 memset(&freq->stream, 0, sizeof(freq->stream));
1272 git_inflate_init(&freq->stream);
1273 git_SHA1_Init(&freq->c);
1274 if (prev_posn>0) {
1275 prev_posn = 0;
1276 lseek(freq->localfile, 0, SEEK_SET);
1277 if (ftruncate(freq->localfile, 0) < 0) {
1278 error("Couldn't truncate temporary file %s: %s",
1279 freq->tmpfile, strerror(errno));
1280 goto abort;
1281 }
1282 }
1283 }
1284
1285 freq->slot = get_active_slot();
1286
1287 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1288 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1289 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1290 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1291 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1292
1293 /*
1294 * If we have successfully processed data from a previous fetch
1295 * attempt, only fetch the data we don't already have.
1296 */
1297 if (prev_posn>0) {
1298 if (http_is_verbose)
1299 fprintf(stderr,
1300 "Resuming fetch of object %s at byte %ld\n",
1301 hex, prev_posn);
1302 sprintf(range, "Range: bytes=%ld-", prev_posn);
1303 range_header = curl_slist_append(range_header, range);
1304 curl_easy_setopt(freq->slot->curl,
1305 CURLOPT_HTTPHEADER, range_header);
1306 }
1307
1308 return freq;
1309
1310 abort:
1311 free(freq->url);
1312 free(freq);
1313 return NULL;
1314 }
1315
1316 void process_http_object_request(struct http_object_request *freq)
1317 {
1318 if (freq->slot == NULL)
1319 return;
1320 freq->curl_result = freq->slot->curl_result;
1321 freq->http_code = freq->slot->http_code;
1322 freq->slot = NULL;
1323 }
1324
1325 int finish_http_object_request(struct http_object_request *freq)
1326 {
1327 struct stat st;
1328
1329 close(freq->localfile);
1330 freq->localfile = -1;
1331
1332 process_http_object_request(freq);
1333
1334 if (freq->http_code == 416) {
1335 warning("requested range invalid; we may already have all the data.");
1336 } else if (freq->curl_result != CURLE_OK) {
1337 if (stat(freq->tmpfile, &st) == 0)
1338 if (st.st_size == 0)
1339 unlink_or_warn(freq->tmpfile);
1340 return -1;
1341 }
1342
1343 git_inflate_end(&freq->stream);
1344 git_SHA1_Final(freq->real_sha1, &freq->c);
1345 if (freq->zret != Z_STREAM_END) {
1346 unlink_or_warn(freq->tmpfile);
1347 return -1;
1348 }
1349 if (hashcmp(freq->sha1, freq->real_sha1)) {
1350 unlink_or_warn(freq->tmpfile);
1351 return -1;
1352 }
1353 freq->rename =
1354 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1355
1356 return freq->rename;
1357 }
1358
1359 void abort_http_object_request(struct http_object_request *freq)
1360 {
1361 unlink_or_warn(freq->tmpfile);
1362
1363 release_http_object_request(freq);
1364 }
1365
1366 void release_http_object_request(struct http_object_request *freq)
1367 {
1368 if (freq->localfile != -1) {
1369 close(freq->localfile);
1370 freq->localfile = -1;
1371 }
1372 if (freq->url != NULL) {
1373 free(freq->url);
1374 freq->url = NULL;
1375 }
1376 if (freq->slot != NULL) {
1377 freq->slot->callback_func = NULL;
1378 freq->slot->callback_data = NULL;
1379 release_active_slot(freq->slot);
1380 freq->slot = NULL;
1381 }
1382 }
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