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git-remote-hg: add the helper
[git/dscho.git] / http.c
blob0270a3f883d763a756eaeddb535605e0ddcfd070
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 "exec_cmd.h"
8
9 int active_requests;
10 int http_is_verbose;
11 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
12
13 #if LIBCURL_VERSION_NUM >= 0x070a06
14 #define LIBCURL_CAN_HANDLE_AUTH_ANY
15 #endif
16
17 static int min_curl_sessions = 1;
18 static int curl_session_count;
19 #ifdef USE_CURL_MULTI
20 static int max_requests = -1;
21 static CURLM *curlm;
22 #endif
23 #ifndef NO_CURL_EASY_DUPHANDLE
24 static CURL *curl_default;
25 #endif
26
27 #define PREV_BUF_SIZE 4096
28 #define RANGE_HEADER_SIZE 30
29
30 char curl_errorstr[CURL_ERROR_SIZE];
31
32 static int curl_ssl_verify = -1;
33 static const char *ssl_cert;
34 #if LIBCURL_VERSION_NUM >= 0x070903
35 static const char *ssl_key;
36 #endif
37 #if LIBCURL_VERSION_NUM >= 0x070908
38 static const char *ssl_capath;
39 #endif
40 static const char *ssl_cainfo;
41 static long curl_low_speed_limit = -1;
42 static long curl_low_speed_time = -1;
43 static int curl_ftp_no_epsv;
44 static const char *curl_http_proxy;
45 static const char *curl_cookie_file;
46 static struct credential http_auth = CREDENTIAL_INIT;
47 static int http_proactive_auth;
48 static const char *user_agent;
49
50 #if LIBCURL_VERSION_NUM >= 0x071700
51 /* Use CURLOPT_KEYPASSWD as is */
52 #elif LIBCURL_VERSION_NUM >= 0x070903
53 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
54 #else
55 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
56 #endif
57
58 static struct credential cert_auth = CREDENTIAL_INIT;
59 static int ssl_cert_password_required;
60
61 static struct curl_slist *pragma_header;
62 static struct curl_slist *no_pragma_header;
63
64 static struct active_request_slot *active_queue_head;
65
66 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
67 {
68 size_t size = eltsize * nmemb;
69 struct buffer *buffer = buffer_;
70
71 if (size > buffer->buf.len - buffer->posn)
72 size = buffer->buf.len - buffer->posn;
73 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
74 buffer->posn += size;
75
76 return size;
77 }
78
79 #ifndef NO_CURL_IOCTL
80 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
81 {
82 struct buffer *buffer = clientp;
83
84 switch (cmd) {
85 case CURLIOCMD_NOP:
86 return CURLIOE_OK;
87
88 case CURLIOCMD_RESTARTREAD:
89 buffer->posn = 0;
90 return CURLIOE_OK;
91
92 default:
93 return CURLIOE_UNKNOWNCMD;
94 }
95 }
96 #endif
97
98 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
99 {
100 size_t size = eltsize * nmemb;
101 struct strbuf *buffer = buffer_;
102
103 strbuf_add(buffer, ptr, size);
104 return size;
105 }
106
107 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
108 {
109 return eltsize * nmemb;
110 }
111
112 #ifdef USE_CURL_MULTI
113 static void process_curl_messages(void)
114 {
115 int num_messages;
116 struct active_request_slot *slot;
117 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
118
119 while (curl_message != NULL) {
120 if (curl_message->msg == CURLMSG_DONE) {
121 int curl_result = curl_message->data.result;
122 slot = active_queue_head;
123 while (slot != NULL &&
124 slot->curl != curl_message->easy_handle)
125 slot = slot->next;
126 if (slot != NULL) {
127 curl_multi_remove_handle(curlm, slot->curl);
128 slot->curl_result = curl_result;
129 finish_active_slot(slot);
130 } else {
131 fprintf(stderr, "Received DONE message for unknown request!\n");
132 }
133 } else {
134 fprintf(stderr, "Unknown CURL message received: %d\n",
135 (int)curl_message->msg);
136 }
137 curl_message = curl_multi_info_read(curlm, &num_messages);
138 }
139 }
140 #endif
141
142 static int git_config_path(const char **result,
143 const char *var, const char *value)
144 {
145 if (git_config_string(result, var, value))
146 return 1;
147 #ifdef __MINGW32__
148 if (**result == '/')
149 *result = system_path((*result) + 1);
150 #endif
151 return 0;
152 }
153
154 static int http_options(const char *var, const char *value, void *cb)
155 {
156 if (!strcmp("http.sslverify", var)) {
157 curl_ssl_verify = git_config_bool(var, value);
158 return 0;
159 }
160 if (!strcmp("http.sslcert", var))
161 return git_config_path(&ssl_cert, var, value);
162 #if LIBCURL_VERSION_NUM >= 0x070903
163 if (!strcmp("http.sslkey", var))
164 return git_config_path(&ssl_key, var, value);
165 #endif
166 #if LIBCURL_VERSION_NUM >= 0x070908
167 if (!strcmp("http.sslcapath", var))
168 return git_config_path(&ssl_capath, var, value);
169 #endif
170 if (!strcmp("http.sslcainfo", var))
171 return git_config_path(&ssl_cainfo, var, value);
172 if (!strcmp("http.sslcertpasswordprotected", var)) {
173 if (git_config_bool(var, value))
174 ssl_cert_password_required = 1;
175 return 0;
176 }
177 if (!strcmp("http.minsessions", var)) {
178 min_curl_sessions = git_config_int(var, value);
179 #ifndef USE_CURL_MULTI
180 if (min_curl_sessions > 1)
181 min_curl_sessions = 1;
182 #endif
183 return 0;
184 }
185 #ifdef USE_CURL_MULTI
186 if (!strcmp("http.maxrequests", var)) {
187 max_requests = git_config_int(var, value);
188 return 0;
189 }
190 #endif
191 if (!strcmp("http.lowspeedlimit", var)) {
192 curl_low_speed_limit = (long)git_config_int(var, value);
193 return 0;
194 }
195 if (!strcmp("http.lowspeedtime", var)) {
196 curl_low_speed_time = (long)git_config_int(var, value);
197 return 0;
198 }
199
200 if (!strcmp("http.noepsv", var)) {
201 curl_ftp_no_epsv = git_config_bool(var, value);
202 return 0;
203 }
204 if (!strcmp("http.proxy", var))
205 return git_config_string(&curl_http_proxy, var, value);
206
207 if (!strcmp("http.cookiefile", var))
208 return git_config_string(&curl_cookie_file, var, value);
209
210 if (!strcmp("http.postbuffer", var)) {
211 http_post_buffer = git_config_int(var, value);
212 if (http_post_buffer < LARGE_PACKET_MAX)
213 http_post_buffer = LARGE_PACKET_MAX;
214 return 0;
215 }
216
217 if (!strcmp("http.useragent", var))
218 return git_config_string(&user_agent, var, value);
219
220 /* Fall back on the default ones */
221 return git_default_config(var, value, cb);
222 }
223
224 static void init_curl_http_auth(CURL *result)
225 {
226 if (!http_auth.username)
227 return;
228
229 credential_fill(&http_auth);
230
231 #if LIBCURL_VERSION_NUM >= 0x071301
232 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
233 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
234 #else
235 {
236 static struct strbuf up = STRBUF_INIT;
237 strbuf_reset(&up);
238 strbuf_addf(&up, "%s:%s",
239 http_auth.username, http_auth.password);
240 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
241 }
242 #endif
243 }
244
245 static int has_cert_password(void)
246 {
247 if (ssl_cert == NULL || ssl_cert_password_required != 1)
248 return 0;
249 if (!cert_auth.password) {
250 cert_auth.protocol = xstrdup("cert");
251 cert_auth.path = xstrdup(ssl_cert);
252 credential_fill(&cert_auth);
253 }
254 return 1;
255 }
256
257 static CURL *get_curl_handle(void)
258 {
259 CURL *result = curl_easy_init();
260
261 if (!curl_ssl_verify) {
262 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
263 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
264 } else {
265 /* Verify authenticity of the peer's certificate */
266 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
267 /* The name in the cert must match whom we tried to connect */
268 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
269 }
270
271 #if LIBCURL_VERSION_NUM >= 0x070907
272 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
273 #endif
274 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
275 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
276 #endif
277
278 if (http_proactive_auth)
279 init_curl_http_auth(result);
280
281 if (ssl_cert != NULL)
282 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
283 if (has_cert_password())
284 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
285 #if LIBCURL_VERSION_NUM >= 0x070903
286 if (ssl_key != NULL)
287 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
288 #endif
289 #if LIBCURL_VERSION_NUM >= 0x070908
290 if (ssl_capath != NULL)
291 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
292 #endif
293 if (ssl_cainfo != NULL)
294 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
295 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
296
297 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
298 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
299 curl_low_speed_limit);
300 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
301 curl_low_speed_time);
302 }
303
304 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
305 #if LIBCURL_VERSION_NUM >= 0x071301
306 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
307 #elif LIBCURL_VERSION_NUM >= 0x071101
308 curl_easy_setopt(result, CURLOPT_POST301, 1);
309 #endif
310
311 if (getenv("GIT_CURL_VERBOSE"))
312 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
313
314 curl_easy_setopt(result, CURLOPT_USERAGENT,
315 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
316
317 if (curl_ftp_no_epsv)
318 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
319
320 if (curl_http_proxy) {
321 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
322 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
323 }
324
325 return result;
326 }
327
328 static void set_from_env(const char **var, const char *envname)
329 {
330 const char *val = getenv(envname);
331 if (val)
332 *var = val;
333 }
334
335 void http_init(struct remote *remote, const char *url, int proactive_auth)
336 {
337 char *low_speed_limit;
338 char *low_speed_time;
339
340 http_is_verbose = 0;
341
342 git_config(http_options, NULL);
343
344 curl_global_init(CURL_GLOBAL_ALL);
345
346 http_proactive_auth = proactive_auth;
347
348 if (remote && remote->http_proxy)
349 curl_http_proxy = xstrdup(remote->http_proxy);
350
351 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
352 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
353
354 #ifdef USE_CURL_MULTI
355 {
356 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
357 if (http_max_requests != NULL)
358 max_requests = atoi(http_max_requests);
359 }
360
361 curlm = curl_multi_init();
362 if (curlm == NULL) {
363 fprintf(stderr, "Error creating curl multi handle.\n");
364 exit(1);
365 }
366 #endif
367
368 if (getenv("GIT_SSL_NO_VERIFY"))
369 curl_ssl_verify = 0;
370
371 set_from_env(&ssl_cert, "GIT_SSL_CERT");
372 #if LIBCURL_VERSION_NUM >= 0x070903
373 set_from_env(&ssl_key, "GIT_SSL_KEY");
374 #endif
375 #if LIBCURL_VERSION_NUM >= 0x070908
376 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
377 #endif
378 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
379
380 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
381
382 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
383 if (low_speed_limit != NULL)
384 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
385 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
386 if (low_speed_time != NULL)
387 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
388
389 if (curl_ssl_verify == -1)
390 curl_ssl_verify = 1;
391
392 curl_session_count = 0;
393 #ifdef USE_CURL_MULTI
394 if (max_requests < 1)
395 max_requests = DEFAULT_MAX_REQUESTS;
396 #endif
397
398 if (getenv("GIT_CURL_FTP_NO_EPSV"))
399 curl_ftp_no_epsv = 1;
400
401 if (url) {
402 credential_from_url(&http_auth, url);
403 if (!ssl_cert_password_required &&
404 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
405 !prefixcmp(url, "https://"))
406 ssl_cert_password_required = 1;
407 }
408
409 #ifndef NO_CURL_EASY_DUPHANDLE
410 curl_default = get_curl_handle();
411 #endif
412 }
413
414 void http_cleanup(void)
415 {
416 struct active_request_slot *slot = active_queue_head;
417
418 while (slot != NULL) {
419 struct active_request_slot *next = slot->next;
420 if (slot->curl != NULL) {
421 #ifdef USE_CURL_MULTI
422 curl_multi_remove_handle(curlm, slot->curl);
423 #endif
424 curl_easy_cleanup(slot->curl);
425 }
426 free(slot);
427 slot = next;
428 }
429 active_queue_head = NULL;
430
431 #ifndef NO_CURL_EASY_DUPHANDLE
432 curl_easy_cleanup(curl_default);
433 #endif
434
435 #ifdef USE_CURL_MULTI
436 curl_multi_cleanup(curlm);
437 #endif
438 curl_global_cleanup();
439
440 curl_slist_free_all(pragma_header);
441 pragma_header = NULL;
442
443 curl_slist_free_all(no_pragma_header);
444 no_pragma_header = NULL;
445
446 if (curl_http_proxy) {
447 free((void *)curl_http_proxy);
448 curl_http_proxy = NULL;
449 }
450
451 if (cert_auth.password != NULL) {
452 memset(cert_auth.password, 0, strlen(cert_auth.password));
453 free(cert_auth.password);
454 cert_auth.password = NULL;
455 }
456 ssl_cert_password_required = 0;
457 }
458
459 struct active_request_slot *get_active_slot(void)
460 {
461 struct active_request_slot *slot = active_queue_head;
462 struct active_request_slot *newslot;
463
464 #ifdef USE_CURL_MULTI
465 int num_transfers;
466
467 /* Wait for a slot to open up if the queue is full */
468 while (active_requests >= max_requests) {
469 curl_multi_perform(curlm, &num_transfers);
470 if (num_transfers < active_requests)
471 process_curl_messages();
472 }
473 #endif
474
475 while (slot != NULL && slot->in_use)
476 slot = slot->next;
477
478 if (slot == NULL) {
479 newslot = xmalloc(sizeof(*newslot));
480 newslot->curl = NULL;
481 newslot->in_use = 0;
482 newslot->next = NULL;
483
484 slot = active_queue_head;
485 if (slot == NULL) {
486 active_queue_head = newslot;
487 } else {
488 while (slot->next != NULL)
489 slot = slot->next;
490 slot->next = newslot;
491 }
492 slot = newslot;
493 }
494
495 if (slot->curl == NULL) {
496 #ifdef NO_CURL_EASY_DUPHANDLE
497 slot->curl = get_curl_handle();
498 #else
499 slot->curl = curl_easy_duphandle(curl_default);
500 #endif
501 curl_session_count++;
502 }
503
504 active_requests++;
505 slot->in_use = 1;
506 slot->results = NULL;
507 slot->finished = NULL;
508 slot->callback_data = NULL;
509 slot->callback_func = NULL;
510 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
511 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
512 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
513 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
514 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
515 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
516 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
517 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
518 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
519 if (http_auth.password)
520 init_curl_http_auth(slot->curl);
521
522 return slot;
523 }
524
525 int start_active_slot(struct active_request_slot *slot)
526 {
527 #ifdef USE_CURL_MULTI
528 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
529 int num_transfers;
530
531 if (curlm_result != CURLM_OK &&
532 curlm_result != CURLM_CALL_MULTI_PERFORM) {
533 active_requests--;
534 slot->in_use = 0;
535 return 0;
536 }
537
538 /*
539 * We know there must be something to do, since we just added
540 * something.
541 */
542 curl_multi_perform(curlm, &num_transfers);
543 #endif
544 return 1;
545 }
546
547 #ifdef USE_CURL_MULTI
548 struct fill_chain {
549 void *data;
550 int (*fill)(void *);
551 struct fill_chain *next;
552 };
553
554 static struct fill_chain *fill_cfg;
555
556 void add_fill_function(void *data, int (*fill)(void *))
557 {
558 struct fill_chain *new = xmalloc(sizeof(*new));
559 struct fill_chain **linkp = &fill_cfg;
560 new->data = data;
561 new->fill = fill;
562 new->next = NULL;
563 while (*linkp)
564 linkp = &(*linkp)->next;
565 *linkp = new;
566 }
567
568 void fill_active_slots(void)
569 {
570 struct active_request_slot *slot = active_queue_head;
571
572 while (active_requests < max_requests) {
573 struct fill_chain *fill;
574 for (fill = fill_cfg; fill; fill = fill->next)
575 if (fill->fill(fill->data))
576 break;
577
578 if (!fill)
579 break;
580 }
581
582 while (slot != NULL) {
583 if (!slot->in_use && slot->curl != NULL
584 && curl_session_count > min_curl_sessions) {
585 curl_easy_cleanup(slot->curl);
586 slot->curl = NULL;
587 curl_session_count--;
588 }
589 slot = slot->next;
590 }
591 }
592
593 void step_active_slots(void)
594 {
595 int num_transfers;
596 CURLMcode curlm_result;
597
598 do {
599 curlm_result = curl_multi_perform(curlm, &num_transfers);
600 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
601 if (num_transfers < active_requests) {
602 process_curl_messages();
603 fill_active_slots();
604 }
605 }
606 #endif
607
608 void run_active_slot(struct active_request_slot *slot)
609 {
610 #ifdef USE_CURL_MULTI
611 fd_set readfds;
612 fd_set writefds;
613 fd_set excfds;
614 int max_fd;
615 struct timeval select_timeout;
616 int finished = 0;
617
618 slot->finished = &finished;
619 while (!finished) {
620 step_active_slots();
621
622 if (slot->in_use) {
623 #if LIBCURL_VERSION_NUM >= 0x070f04
624 long curl_timeout;
625 curl_multi_timeout(curlm, &curl_timeout);
626 if (curl_timeout == 0) {
627 continue;
628 } else if (curl_timeout == -1) {
629 select_timeout.tv_sec = 0;
630 select_timeout.tv_usec = 50000;
631 } else {
632 select_timeout.tv_sec = curl_timeout / 1000;
633 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
634 }
635 #else
636 select_timeout.tv_sec = 0;
637 select_timeout.tv_usec = 50000;
638 #endif
639
640 max_fd = -1;
641 FD_ZERO(&readfds);
642 FD_ZERO(&writefds);
643 FD_ZERO(&excfds);
644 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
645
646 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
647 }
648 }
649 #else
650 while (slot->in_use) {
651 slot->curl_result = curl_easy_perform(slot->curl);
652 finish_active_slot(slot);
653 }
654 #endif
655 }
656
657 static void closedown_active_slot(struct active_request_slot *slot)
658 {
659 active_requests--;
660 slot->in_use = 0;
661 }
662
663 static void release_active_slot(struct active_request_slot *slot)
664 {
665 closedown_active_slot(slot);
666 if (slot->curl && curl_session_count > min_curl_sessions) {
667 #ifdef USE_CURL_MULTI
668 curl_multi_remove_handle(curlm, slot->curl);
669 #endif
670 curl_easy_cleanup(slot->curl);
671 slot->curl = NULL;
672 curl_session_count--;
673 }
674 #ifdef USE_CURL_MULTI
675 fill_active_slots();
676 #endif
677 }
678
679 void finish_active_slot(struct active_request_slot *slot)
680 {
681 closedown_active_slot(slot);
682 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
683
684 if (slot->finished != NULL)
685 (*slot->finished) = 1;
686
687 /* Store slot results so they can be read after the slot is reused */
688 if (slot->results != NULL) {
689 slot->results->curl_result = slot->curl_result;
690 slot->results->http_code = slot->http_code;
691 }
692
693 /* Run callback if appropriate */
694 if (slot->callback_func != NULL)
695 slot->callback_func(slot->callback_data);
696 }
697
698 void finish_all_active_slots(void)
699 {
700 struct active_request_slot *slot = active_queue_head;
701
702 while (slot != NULL)
703 if (slot->in_use) {
704 run_active_slot(slot);
705 slot = active_queue_head;
706 } else {
707 slot = slot->next;
708 }
709 }
710
711 /* Helpers for modifying and creating URLs */
712 static inline int needs_quote(int ch)
713 {
714 if (((ch >= 'A') && (ch <= 'Z'))
715 || ((ch >= 'a') && (ch <= 'z'))
716 || ((ch >= '0') && (ch <= '9'))
717 || (ch == '/')
718 || (ch == '-')
719 || (ch == '.'))
720 return 0;
721 return 1;
722 }
723
724 static char *quote_ref_url(const char *base, const char *ref)
725 {
726 struct strbuf buf = STRBUF_INIT;
727 const char *cp;
728 int ch;
729
730 end_url_with_slash(&buf, base);
731
732 for (cp = ref; (ch = *cp) != 0; cp++)
733 if (needs_quote(ch))
734 strbuf_addf(&buf, "%%%02x", ch);
735 else
736 strbuf_addch(&buf, *cp);
737
738 return strbuf_detach(&buf, NULL);
739 }
740
741 void append_remote_object_url(struct strbuf *buf, const char *url,
742 const char *hex,
743 int only_two_digit_prefix)
744 {
745 end_url_with_slash(buf, url);
746
747 strbuf_addf(buf, "objects/%.*s/", 2, hex);
748 if (!only_two_digit_prefix)
749 strbuf_addf(buf, "%s", hex+2);
750 }
751
752 char *get_remote_object_url(const char *url, const char *hex,
753 int only_two_digit_prefix)
754 {
755 struct strbuf buf = STRBUF_INIT;
756 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
757 return strbuf_detach(&buf, NULL);
758 }
759
760 /* http_request() targets */
761 #define HTTP_REQUEST_STRBUF 0
762 #define HTTP_REQUEST_FILE 1
763
764 static int http_request(const char *url, void *result, int target, int options)
765 {
766 struct active_request_slot *slot;
767 struct slot_results results;
768 struct curl_slist *headers = NULL;
769 struct strbuf buf = STRBUF_INIT;
770 int ret;
771
772 slot = get_active_slot();
773 slot->results = &results;
774 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
775
776 if (result == NULL) {
777 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
778 } else {
779 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
780 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
781
782 if (target == HTTP_REQUEST_FILE) {
783 long posn = ftell(result);
784 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
785 fwrite);
786 if (posn > 0) {
787 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
788 headers = curl_slist_append(headers, buf.buf);
789 strbuf_reset(&buf);
790 }
791 } else
792 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
793 fwrite_buffer);
794 }
795
796 strbuf_addstr(&buf, "Pragma:");
797 if (options & HTTP_NO_CACHE)
798 strbuf_addstr(&buf, " no-cache");
799
800 headers = curl_slist_append(headers, buf.buf);
801
802 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
803 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
804
805 if (start_active_slot(slot)) {
806 run_active_slot(slot);
807 if (results.curl_result == CURLE_OK)
808 ret = HTTP_OK;
809 else if (missing_target(&results))
810 ret = HTTP_MISSING_TARGET;
811 else if (results.http_code == 401) {
812 if (http_auth.username && http_auth.password) {
813 credential_reject(&http_auth);
814 ret = HTTP_NOAUTH;
815 } else {
816 credential_fill(&http_auth);
817 init_curl_http_auth(slot->curl);
818 ret = HTTP_REAUTH;
819 }
820 } else {
821 if (!curl_errorstr[0])
822 strlcpy(curl_errorstr,
823 curl_easy_strerror(results.curl_result),
824 sizeof(curl_errorstr));
825 ret = HTTP_ERROR;
826 }
827 } else {
828 error("Unable to start HTTP request for %s", url);
829 ret = HTTP_START_FAILED;
830 }
831
832 curl_slist_free_all(headers);
833 strbuf_release(&buf);
834
835 if (ret == HTTP_OK)
836 credential_approve(&http_auth);
837
838 return ret;
839 }
840
841 static int http_request_reauth(const char *url, void *result, int target,
842 int options)
843 {
844 int ret = http_request(url, result, target, options);
845 if (ret != HTTP_REAUTH)
846 return ret;
847 return http_request(url, result, target, options);
848 }
849
850 int http_get_strbuf(const char *url, struct strbuf *result, int options)
851 {
852 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
853 }
854
855 /*
856 * Downloads a URL and stores the result in the given file.
857 *
858 * If a previous interrupted download is detected (i.e. a previous temporary
859 * file is still around) the download is resumed.
860 */
861 static int http_get_file(const char *url, const char *filename, int options)
862 {
863 int ret;
864 struct strbuf tmpfile = STRBUF_INIT;
865 FILE *result;
866
867 strbuf_addf(&tmpfile, "%s.temp", filename);
868 result = fopen(tmpfile.buf, "a");
869 if (! result) {
870 error("Unable to open local file %s", tmpfile.buf);
871 ret = HTTP_ERROR;
872 goto cleanup;
873 }
874
875 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
876 fclose(result);
877
878 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
879 ret = HTTP_ERROR;
880 cleanup:
881 strbuf_release(&tmpfile);
882 return ret;
883 }
884
885 int http_error(const char *url, int ret)
886 {
887 /* http_request has already handled HTTP_START_FAILED. */
888 if (ret != HTTP_START_FAILED)
889 error("%s while accessing %s", curl_errorstr, url);
890
891 return ret;
892 }
893
894 int http_fetch_ref(const char *base, struct ref *ref)
895 {
896 char *url;
897 struct strbuf buffer = STRBUF_INIT;
898 int ret = -1;
899
900 url = quote_ref_url(base, ref->name);
901 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
902 strbuf_rtrim(&buffer);
903 if (buffer.len == 40)
904 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
905 else if (!prefixcmp(buffer.buf, "ref: ")) {
906 ref->symref = xstrdup(buffer.buf + 5);
907 ret = 0;
908 }
909 }
910
911 strbuf_release(&buffer);
912 free(url);
913 return ret;
914 }
915
916 /* Helpers for fetching packs */
917 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
918 {
919 char *url, *tmp;
920 struct strbuf buf = STRBUF_INIT;
921
922 if (http_is_verbose)
923 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
924
925 end_url_with_slash(&buf, base_url);
926 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
927 url = strbuf_detach(&buf, NULL);
928
929 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
930 tmp = strbuf_detach(&buf, NULL);
931
932 if (http_get_file(url, tmp, 0) != HTTP_OK) {
933 error("Unable to get pack index %s", url);
934 free(tmp);
935 tmp = NULL;
936 }
937
938 free(url);
939 return tmp;
940 }
941
942 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
943 unsigned char *sha1, const char *base_url)
944 {
945 struct packed_git *new_pack;
946 char *tmp_idx = NULL;
947 int ret;
948
949 if (has_pack_index(sha1)) {
950 new_pack = parse_pack_index(sha1, NULL);
951 if (!new_pack)
952 return -1; /* parse_pack_index() already issued error message */
953 goto add_pack;
954 }
955
956 tmp_idx = fetch_pack_index(sha1, base_url);
957 if (!tmp_idx)
958 return -1;
959
960 new_pack = parse_pack_index(sha1, tmp_idx);
961 if (!new_pack) {
962 unlink(tmp_idx);
963 free(tmp_idx);
964
965 return -1; /* parse_pack_index() already issued error message */
966 }
967
968 ret = verify_pack_index(new_pack);
969 if (!ret) {
970 close_pack_index(new_pack);
971 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
972 }
973 free(tmp_idx);
974 if (ret)
975 return -1;
976
977 add_pack:
978 new_pack->next = *packs_head;
979 *packs_head = new_pack;
980 return 0;
981 }
982
983 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
984 {
985 int ret = 0, i = 0;
986 char *url, *data;
987 struct strbuf buf = STRBUF_INIT;
988 unsigned char sha1[20];
989
990 end_url_with_slash(&buf, base_url);
991 strbuf_addstr(&buf, "objects/info/packs");
992 url = strbuf_detach(&buf, NULL);
993
994 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
995 if (ret != HTTP_OK)
996 goto cleanup;
997
998 data = buf.buf;
999 while (i < buf.len) {
1000 switch (data[i]) {
1001 case 'P':
1002 i++;
1003 if (i + 52 <= buf.len &&
1004 !prefixcmp(data + i, " pack-") &&
1005 !prefixcmp(data + i + 46, ".pack\n")) {
1006 get_sha1_hex(data + i + 6, sha1);
1007 fetch_and_setup_pack_index(packs_head, sha1,
1008 base_url);
1009 i += 51;
1010 break;
1011 }
1012 default:
1013 while (i < buf.len && data[i] != '\n')
1014 i++;
1015 }
1016 i++;
1017 }
1018
1019 cleanup:
1020 free(url);
1021 return ret;
1022 }
1023
1024 void release_http_pack_request(struct http_pack_request *preq)
1025 {
1026 if (preq->packfile != NULL) {
1027 fclose(preq->packfile);
1028 preq->packfile = NULL;
1029 }
1030 if (preq->range_header != NULL) {
1031 curl_slist_free_all(preq->range_header);
1032 preq->range_header = NULL;
1033 }
1034 preq->slot = NULL;
1035 free(preq->url);
1036 }
1037
1038 int finish_http_pack_request(struct http_pack_request *preq)
1039 {
1040 struct packed_git **lst;
1041 struct packed_git *p = preq->target;
1042 char *tmp_idx;
1043 struct child_process ip;
1044 const char *ip_argv[8];
1045
1046 close_pack_index(p);
1047
1048 fclose(preq->packfile);
1049 preq->packfile = NULL;
1050
1051 lst = preq->lst;
1052 while (*lst != p)
1053 lst = &((*lst)->next);
1054 *lst = (*lst)->next;
1055
1056 tmp_idx = xstrdup(preq->tmpfile);
1057 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1058 ".idx.temp");
1059
1060 ip_argv[0] = "index-pack";
1061 ip_argv[1] = "-o";
1062 ip_argv[2] = tmp_idx;
1063 ip_argv[3] = preq->tmpfile;
1064 ip_argv[4] = NULL;
1065
1066 memset(&ip, 0, sizeof(ip));
1067 ip.argv = ip_argv;
1068 ip.git_cmd = 1;
1069 ip.no_stdin = 1;
1070 ip.no_stdout = 1;
1071
1072 if (run_command(&ip)) {
1073 unlink(preq->tmpfile);
1074 unlink(tmp_idx);
1075 free(tmp_idx);
1076 return -1;
1077 }
1078
1079 unlink(sha1_pack_index_name(p->sha1));
1080
1081 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1082 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1083 free(tmp_idx);
1084 return -1;
1085 }
1086
1087 install_packed_git(p);
1088 free(tmp_idx);
1089 return 0;
1090 }
1091
1092 struct http_pack_request *new_http_pack_request(
1093 struct packed_git *target, const char *base_url)
1094 {
1095 long prev_posn = 0;
1096 char range[RANGE_HEADER_SIZE];
1097 struct strbuf buf = STRBUF_INIT;
1098 struct http_pack_request *preq;
1099
1100 preq = xcalloc(1, sizeof(*preq));
1101 preq->target = target;
1102
1103 end_url_with_slash(&buf, base_url);
1104 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1105 sha1_to_hex(target->sha1));
1106 preq->url = strbuf_detach(&buf, NULL);
1107
1108 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1109 sha1_pack_name(target->sha1));
1110 preq->packfile = fopen(preq->tmpfile, "a");
1111 if (!preq->packfile) {
1112 error("Unable to open local file %s for pack",
1113 preq->tmpfile);
1114 goto abort;
1115 }
1116
1117 preq->slot = get_active_slot();
1118 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1119 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1120 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1121 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1122 no_pragma_header);
1123
1124 /*
1125 * If there is data present from a previous transfer attempt,
1126 * resume where it left off
1127 */
1128 prev_posn = ftell(preq->packfile);
1129 if (prev_posn>0) {
1130 if (http_is_verbose)
1131 fprintf(stderr,
1132 "Resuming fetch of pack %s at byte %ld\n",
1133 sha1_to_hex(target->sha1), prev_posn);
1134 sprintf(range, "Range: bytes=%ld-", prev_posn);
1135 preq->range_header = curl_slist_append(NULL, range);
1136 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1137 preq->range_header);
1138 }
1139
1140 return preq;
1141
1142 abort:
1143 free(preq->url);
1144 free(preq);
1145 return NULL;
1146 }
1147
1148 /* Helpers for fetching objects (loose) */
1149 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1150 void *data)
1151 {
1152 unsigned char expn[4096];
1153 size_t size = eltsize * nmemb;
1154 int posn = 0;
1155 struct http_object_request *freq =
1156 (struct http_object_request *)data;
1157 do {
1158 ssize_t retval = xwrite(freq->localfile,
1159 (char *) ptr + posn, size - posn);
1160 if (retval < 0)
1161 return posn;
1162 posn += retval;
1163 } while (posn < size);
1164
1165 freq->stream.avail_in = size;
1166 freq->stream.next_in = (void *)ptr;
1167 do {
1168 freq->stream.next_out = expn;
1169 freq->stream.avail_out = sizeof(expn);
1170 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1171 git_SHA1_Update(&freq->c, expn,
1172 sizeof(expn) - freq->stream.avail_out);
1173 } while (freq->stream.avail_in && freq->zret == Z_OK);
1174 return size;
1175 }
1176
1177 struct http_object_request *new_http_object_request(const char *base_url,
1178 unsigned char *sha1)
1179 {
1180 char *hex = sha1_to_hex(sha1);
1181 char *filename;
1182 char prevfile[PATH_MAX];
1183 int prevlocal;
1184 char prev_buf[PREV_BUF_SIZE];
1185 ssize_t prev_read = 0;
1186 long prev_posn = 0;
1187 char range[RANGE_HEADER_SIZE];
1188 struct curl_slist *range_header = NULL;
1189 struct http_object_request *freq;
1190
1191 freq = xcalloc(1, sizeof(*freq));
1192 hashcpy(freq->sha1, sha1);
1193 freq->localfile = -1;
1194
1195 filename = sha1_file_name(sha1);
1196 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1197 "%s.temp", filename);
1198
1199 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1200 unlink_or_warn(prevfile);
1201 rename(freq->tmpfile, prevfile);
1202 unlink_or_warn(freq->tmpfile);
1203
1204 if (freq->localfile != -1)
1205 error("fd leakage in start: %d", freq->localfile);
1206 freq->localfile = open(freq->tmpfile,
1207 O_WRONLY | O_CREAT | O_EXCL, 0666);
1208 /*
1209 * This could have failed due to the "lazy directory creation";
1210 * try to mkdir the last path component.
1211 */
1212 if (freq->localfile < 0 && errno == ENOENT) {
1213 char *dir = strrchr(freq->tmpfile, '/');
1214 if (dir) {
1215 *dir = 0;
1216 mkdir(freq->tmpfile, 0777);
1217 *dir = '/';
1218 }
1219 freq->localfile = open(freq->tmpfile,
1220 O_WRONLY | O_CREAT | O_EXCL, 0666);
1221 }
1222
1223 if (freq->localfile < 0) {
1224 error("Couldn't create temporary file %s: %s",
1225 freq->tmpfile, strerror(errno));
1226 goto abort;
1227 }
1228
1229 git_inflate_init(&freq->stream);
1230
1231 git_SHA1_Init(&freq->c);
1232
1233 freq->url = get_remote_object_url(base_url, hex, 0);
1234
1235 /*
1236 * If a previous temp file is present, process what was already
1237 * fetched.
1238 */
1239 prevlocal = open(prevfile, O_RDONLY);
1240 if (prevlocal != -1) {
1241 do {
1242 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1243 if (prev_read>0) {
1244 if (fwrite_sha1_file(prev_buf,
1245 1,
1246 prev_read,
1247 freq) == prev_read) {
1248 prev_posn += prev_read;
1249 } else {
1250 prev_read = -1;
1251 }
1252 }
1253 } while (prev_read > 0);
1254 close(prevlocal);
1255 }
1256 unlink_or_warn(prevfile);
1257
1258 /*
1259 * Reset inflate/SHA1 if there was an error reading the previous temp
1260 * file; also rewind to the beginning of the local file.
1261 */
1262 if (prev_read == -1) {
1263 memset(&freq->stream, 0, sizeof(freq->stream));
1264 git_inflate_init(&freq->stream);
1265 git_SHA1_Init(&freq->c);
1266 if (prev_posn>0) {
1267 prev_posn = 0;
1268 lseek(freq->localfile, 0, SEEK_SET);
1269 if (ftruncate(freq->localfile, 0) < 0) {
1270 error("Couldn't truncate temporary file %s: %s",
1271 freq->tmpfile, strerror(errno));
1272 goto abort;
1273 }
1274 }
1275 }
1276
1277 freq->slot = get_active_slot();
1278
1279 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1280 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1281 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1282 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1283 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1284
1285 /*
1286 * If we have successfully processed data from a previous fetch
1287 * attempt, only fetch the data we don't already have.
1288 */
1289 if (prev_posn>0) {
1290 if (http_is_verbose)
1291 fprintf(stderr,
1292 "Resuming fetch of object %s at byte %ld\n",
1293 hex, prev_posn);
1294 sprintf(range, "Range: bytes=%ld-", prev_posn);
1295 range_header = curl_slist_append(range_header, range);
1296 curl_easy_setopt(freq->slot->curl,
1297 CURLOPT_HTTPHEADER, range_header);
1298 }
1299
1300 return freq;
1301
1302 abort:
1303 free(freq->url);
1304 free(freq);
1305 return NULL;
1306 }
1307
1308 void process_http_object_request(struct http_object_request *freq)
1309 {
1310 if (freq->slot == NULL)
1311 return;
1312 freq->curl_result = freq->slot->curl_result;
1313 freq->http_code = freq->slot->http_code;
1314 freq->slot = NULL;
1315 }
1316
1317 int finish_http_object_request(struct http_object_request *freq)
1318 {
1319 struct stat st;
1320
1321 close(freq->localfile);
1322 freq->localfile = -1;
1323
1324 process_http_object_request(freq);
1325
1326 if (freq->http_code == 416) {
1327 warning("requested range invalid; we may already have all the data.");
1328 } else if (freq->curl_result != CURLE_OK) {
1329 if (stat(freq->tmpfile, &st) == 0)
1330 if (st.st_size == 0)
1331 unlink_or_warn(freq->tmpfile);
1332 return -1;
1333 }
1334
1335 git_inflate_end(&freq->stream);
1336 git_SHA1_Final(freq->real_sha1, &freq->c);
1337 if (freq->zret != Z_STREAM_END) {
1338 unlink_or_warn(freq->tmpfile);
1339 return -1;
1340 }
1341 if (hashcmp(freq->sha1, freq->real_sha1)) {
1342 unlink_or_warn(freq->tmpfile);
1343 return -1;
1344 }
1345 freq->rename =
1346 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1347
1348 return freq->rename;
1349 }
1350
1351 void abort_http_object_request(struct http_object_request *freq)
1352 {
1353 unlink_or_warn(freq->tmpfile);
1354
1355 release_http_object_request(freq);
1356 }
1357
1358 void release_http_object_request(struct http_object_request *freq)
1359 {
1360 if (freq->localfile != -1) {
1361 close(freq->localfile);
1362 freq->localfile = -1;
1363 }
1364 if (freq->url != NULL) {
1365 free(freq->url);
1366 freq->url = NULL;
1367 }
1368 if (freq->slot != NULL) {
1369 freq->slot->callback_func = NULL;
1370 freq->slot->callback_data = NULL;
1371 release_active_slot(freq->slot);
1372 freq->slot = NULL;
1373 }
1374 }
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