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Git.pm: Use stream-like writing in cat_blob()
[git/dscho.git] / http.c
blob649e26fd6e376d4a52dd454497d1c85680759772
1 #include "http.h"
2 #include "pack.h"
3 #include "sideband.h"
4 #include "run-command.h"
5 #include "url.h"
6 #include "exec_cmd.h"
7
8 int data_received;
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 char *user_name, *user_pass;
46 static const char *user_agent;
47
48 #if LIBCURL_VERSION_NUM >= 0x071700
49 /* Use CURLOPT_KEYPASSWD as is */
50 #elif LIBCURL_VERSION_NUM >= 0x070903
51 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
52 #else
53 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
54 #endif
55
56 static char *ssl_cert_password;
57 static int ssl_cert_password_required;
58
59 static struct curl_slist *pragma_header;
60 static struct curl_slist *no_pragma_header;
61
62 static struct active_request_slot *active_queue_head;
63
64 size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
65 {
66 size_t size = eltsize * nmemb;
67 struct buffer *buffer = buffer_;
68
69 if (size > buffer->buf.len - buffer->posn)
70 size = buffer->buf.len - buffer->posn;
71 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
72 buffer->posn += size;
73
74 return size;
75 }
76
77 #ifndef NO_CURL_IOCTL
78 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
79 {
80 struct buffer *buffer = clientp;
81
82 switch (cmd) {
83 case CURLIOCMD_NOP:
84 return CURLIOE_OK;
85
86 case CURLIOCMD_RESTARTREAD:
87 buffer->posn = 0;
88 return CURLIOE_OK;
89
90 default:
91 return CURLIOE_UNKNOWNCMD;
92 }
93 }
94 #endif
95
96 size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
97 {
98 size_t size = eltsize * nmemb;
99 struct strbuf *buffer = buffer_;
100
101 strbuf_add(buffer, ptr, size);
102 data_received++;
103 return size;
104 }
105
106 size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
107 {
108 data_received++;
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.postbuffer", var)) {
208 http_post_buffer = git_config_int(var, value);
209 if (http_post_buffer < LARGE_PACKET_MAX)
210 http_post_buffer = LARGE_PACKET_MAX;
211 return 0;
212 }
213
214 if (!strcmp("http.useragent", var))
215 return git_config_string(&user_agent, var, value);
216
217 /* Fall back on the default ones */
218 return git_default_config(var, value, cb);
219 }
220
221 static void init_curl_http_auth(CURL *result)
222 {
223 if (user_name) {
224 struct strbuf up = STRBUF_INIT;
225 if (!user_pass)
226 user_pass = xstrdup(git_getpass("Password: "));
227 strbuf_addf(&up, "%s:%s", user_name, user_pass);
228 curl_easy_setopt(result, CURLOPT_USERPWD,
229 strbuf_detach(&up, NULL));
230 }
231 }
232
233 static int has_cert_password(void)
234 {
235 if (ssl_cert_password != NULL)
236 return 1;
237 if (ssl_cert == NULL || ssl_cert_password_required != 1)
238 return 0;
239 /* Only prompt the user once. */
240 ssl_cert_password_required = -1;
241 ssl_cert_password = git_getpass("Certificate Password: ");
242 if (ssl_cert_password != NULL) {
243 ssl_cert_password = xstrdup(ssl_cert_password);
244 return 1;
245 } else
246 return 0;
247 }
248
249 static CURL *get_curl_handle(void)
250 {
251 CURL *result = curl_easy_init();
252
253 if (!curl_ssl_verify) {
254 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
255 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
256 } else {
257 /* Verify authenticity of the peer's certificate */
258 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
259 /* The name in the cert must match whom we tried to connect */
260 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
261 }
262
263 #if LIBCURL_VERSION_NUM >= 0x070907
264 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
265 #endif
266 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
267 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
268 #endif
269
270 init_curl_http_auth(result);
271
272 if (ssl_cert != NULL)
273 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
274 if (has_cert_password())
275 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
276 #if LIBCURL_VERSION_NUM >= 0x070903
277 if (ssl_key != NULL)
278 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
279 #endif
280 #if LIBCURL_VERSION_NUM >= 0x070908
281 if (ssl_capath != NULL)
282 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
283 #endif
284 if (ssl_cainfo != NULL)
285 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
286 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
287
288 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
289 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
290 curl_low_speed_limit);
291 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
292 curl_low_speed_time);
293 }
294
295 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
296 #if LIBCURL_VERSION_NUM >= 0x071301
297 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
298 #elif LIBCURL_VERSION_NUM >= 0x071101
299 curl_easy_setopt(result, CURLOPT_POST301, 1);
300 #endif
301
302 if (getenv("GIT_CURL_VERBOSE"))
303 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
304
305 curl_easy_setopt(result, CURLOPT_USERAGENT,
306 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
307
308 if (curl_ftp_no_epsv)
309 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
310
311 if (curl_http_proxy)
312 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
313
314 return result;
315 }
316
317 static void http_auth_init(const char *url)
318 {
319 char *at, *colon, *cp, *slash, *decoded;
320 int len;
321
322 cp = strstr(url, "://");
323 if (!cp)
324 return;
325
326 /*
327 * Ok, the URL looks like "proto://something". Which one?
328 * "proto://<user>:<pass>@<host>/...",
329 * "proto://<user>@<host>/...", or just
330 * "proto://<host>/..."?
331 */
332 cp += 3;
333 at = strchr(cp, '@');
334 colon = strchr(cp, ':');
335 slash = strchrnul(cp, '/');
336 if (!at || slash <= at)
337 return; /* No credentials */
338 if (!colon || at <= colon) {
339 /* Only username */
340 len = at - cp;
341 user_name = xmalloc(len + 1);
342 memcpy(user_name, cp, len);
343 user_name[len] = '\0';
344 decoded = url_decode(user_name);
345 free(user_name);
346 user_name = decoded;
347 user_pass = NULL;
348 } else {
349 len = colon - cp;
350 user_name = xmalloc(len + 1);
351 memcpy(user_name, cp, len);
352 user_name[len] = '\0';
353 decoded = url_decode(user_name);
354 free(user_name);
355 user_name = decoded;
356 len = at - (colon + 1);
357 user_pass = xmalloc(len + 1);
358 memcpy(user_pass, colon + 1, len);
359 user_pass[len] = '\0';
360 decoded = url_decode(user_pass);
361 free(user_pass);
362 user_pass = decoded;
363 }
364 }
365
366 static void set_from_env(const char **var, const char *envname)
367 {
368 const char *val = getenv(envname);
369 if (val)
370 *var = val;
371 }
372
373 void http_init(struct remote *remote)
374 {
375 char *low_speed_limit;
376 char *low_speed_time;
377
378 http_is_verbose = 0;
379
380 git_config(http_options, NULL);
381
382 curl_global_init(CURL_GLOBAL_ALL);
383
384 if (remote && remote->http_proxy)
385 curl_http_proxy = xstrdup(remote->http_proxy);
386
387 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
388 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
389
390 #ifdef USE_CURL_MULTI
391 {
392 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
393 if (http_max_requests != NULL)
394 max_requests = atoi(http_max_requests);
395 }
396
397 curlm = curl_multi_init();
398 if (curlm == NULL) {
399 fprintf(stderr, "Error creating curl multi handle.\n");
400 exit(1);
401 }
402 #endif
403
404 if (getenv("GIT_SSL_NO_VERIFY"))
405 curl_ssl_verify = 0;
406
407 set_from_env(&ssl_cert, "GIT_SSL_CERT");
408 #if LIBCURL_VERSION_NUM >= 0x070903
409 set_from_env(&ssl_key, "GIT_SSL_KEY");
410 #endif
411 #if LIBCURL_VERSION_NUM >= 0x070908
412 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
413 #endif
414 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
415
416 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
417
418 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
419 if (low_speed_limit != NULL)
420 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
421 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
422 if (low_speed_time != NULL)
423 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
424
425 if (curl_ssl_verify == -1)
426 curl_ssl_verify = 1;
427
428 curl_session_count = 0;
429 #ifdef USE_CURL_MULTI
430 if (max_requests < 1)
431 max_requests = DEFAULT_MAX_REQUESTS;
432 #endif
433
434 if (getenv("GIT_CURL_FTP_NO_EPSV"))
435 curl_ftp_no_epsv = 1;
436
437 if (remote && remote->url && remote->url[0]) {
438 http_auth_init(remote->url[0]);
439 if (!ssl_cert_password_required &&
440 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
441 !prefixcmp(remote->url[0], "https://"))
442 ssl_cert_password_required = 1;
443 }
444
445 #ifndef NO_CURL_EASY_DUPHANDLE
446 curl_default = get_curl_handle();
447 #endif
448 }
449
450 void http_cleanup(void)
451 {
452 struct active_request_slot *slot = active_queue_head;
453
454 while (slot != NULL) {
455 struct active_request_slot *next = slot->next;
456 if (slot->curl != NULL) {
457 #ifdef USE_CURL_MULTI
458 curl_multi_remove_handle(curlm, slot->curl);
459 #endif
460 curl_easy_cleanup(slot->curl);
461 }
462 free(slot);
463 slot = next;
464 }
465 active_queue_head = NULL;
466
467 #ifndef NO_CURL_EASY_DUPHANDLE
468 curl_easy_cleanup(curl_default);
469 #endif
470
471 #ifdef USE_CURL_MULTI
472 curl_multi_cleanup(curlm);
473 #endif
474 curl_global_cleanup();
475
476 curl_slist_free_all(pragma_header);
477 pragma_header = NULL;
478
479 curl_slist_free_all(no_pragma_header);
480 no_pragma_header = NULL;
481
482 if (curl_http_proxy) {
483 free((void *)curl_http_proxy);
484 curl_http_proxy = NULL;
485 }
486
487 if (ssl_cert_password != NULL) {
488 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
489 free(ssl_cert_password);
490 ssl_cert_password = NULL;
491 }
492 ssl_cert_password_required = 0;
493 }
494
495 struct active_request_slot *get_active_slot(void)
496 {
497 struct active_request_slot *slot = active_queue_head;
498 struct active_request_slot *newslot;
499
500 #ifdef USE_CURL_MULTI
501 int num_transfers;
502
503 /* Wait for a slot to open up if the queue is full */
504 while (active_requests >= max_requests) {
505 curl_multi_perform(curlm, &num_transfers);
506 if (num_transfers < active_requests)
507 process_curl_messages();
508 }
509 #endif
510
511 while (slot != NULL && slot->in_use)
512 slot = slot->next;
513
514 if (slot == NULL) {
515 newslot = xmalloc(sizeof(*newslot));
516 newslot->curl = NULL;
517 newslot->in_use = 0;
518 newslot->next = NULL;
519
520 slot = active_queue_head;
521 if (slot == NULL) {
522 active_queue_head = newslot;
523 } else {
524 while (slot->next != NULL)
525 slot = slot->next;
526 slot->next = newslot;
527 }
528 slot = newslot;
529 }
530
531 if (slot->curl == NULL) {
532 #ifdef NO_CURL_EASY_DUPHANDLE
533 slot->curl = get_curl_handle();
534 #else
535 slot->curl = curl_easy_duphandle(curl_default);
536 #endif
537 curl_session_count++;
538 }
539
540 active_requests++;
541 slot->in_use = 1;
542 slot->local = NULL;
543 slot->results = NULL;
544 slot->finished = NULL;
545 slot->callback_data = NULL;
546 slot->callback_func = NULL;
547 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
548 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
549 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
550 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
551 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
552 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
553 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
554
555 return slot;
556 }
557
558 int start_active_slot(struct active_request_slot *slot)
559 {
560 #ifdef USE_CURL_MULTI
561 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
562 int num_transfers;
563
564 if (curlm_result != CURLM_OK &&
565 curlm_result != CURLM_CALL_MULTI_PERFORM) {
566 active_requests--;
567 slot->in_use = 0;
568 return 0;
569 }
570
571 /*
572 * We know there must be something to do, since we just added
573 * something.
574 */
575 curl_multi_perform(curlm, &num_transfers);
576 #endif
577 return 1;
578 }
579
580 #ifdef USE_CURL_MULTI
581 struct fill_chain {
582 void *data;
583 int (*fill)(void *);
584 struct fill_chain *next;
585 };
586
587 static struct fill_chain *fill_cfg;
588
589 void add_fill_function(void *data, int (*fill)(void *))
590 {
591 struct fill_chain *new = xmalloc(sizeof(*new));
592 struct fill_chain **linkp = &fill_cfg;
593 new->data = data;
594 new->fill = fill;
595 new->next = NULL;
596 while (*linkp)
597 linkp = &(*linkp)->next;
598 *linkp = new;
599 }
600
601 void fill_active_slots(void)
602 {
603 struct active_request_slot *slot = active_queue_head;
604
605 while (active_requests < max_requests) {
606 struct fill_chain *fill;
607 for (fill = fill_cfg; fill; fill = fill->next)
608 if (fill->fill(fill->data))
609 break;
610
611 if (!fill)
612 break;
613 }
614
615 while (slot != NULL) {
616 if (!slot->in_use && slot->curl != NULL
617 && curl_session_count > min_curl_sessions) {
618 curl_easy_cleanup(slot->curl);
619 slot->curl = NULL;
620 curl_session_count--;
621 }
622 slot = slot->next;
623 }
624 }
625
626 void step_active_slots(void)
627 {
628 int num_transfers;
629 CURLMcode curlm_result;
630
631 do {
632 curlm_result = curl_multi_perform(curlm, &num_transfers);
633 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
634 if (num_transfers < active_requests) {
635 process_curl_messages();
636 fill_active_slots();
637 }
638 }
639 #endif
640
641 void run_active_slot(struct active_request_slot *slot)
642 {
643 #ifdef USE_CURL_MULTI
644 long last_pos = 0;
645 long current_pos;
646 fd_set readfds;
647 fd_set writefds;
648 fd_set excfds;
649 int max_fd;
650 struct timeval select_timeout;
651 int finished = 0;
652
653 slot->finished = &finished;
654 while (!finished) {
655 data_received = 0;
656 step_active_slots();
657
658 if (!data_received && slot->local != NULL) {
659 current_pos = ftell(slot->local);
660 if (current_pos > last_pos)
661 data_received++;
662 last_pos = current_pos;
663 }
664
665 if (slot->in_use && !data_received) {
666 max_fd = 0;
667 FD_ZERO(&readfds);
668 FD_ZERO(&writefds);
669 FD_ZERO(&excfds);
670 select_timeout.tv_sec = 0;
671 select_timeout.tv_usec = 50000;
672 select(max_fd, &readfds, &writefds,
673 &excfds, &select_timeout);
674 }
675 }
676 #else
677 while (slot->in_use) {
678 slot->curl_result = curl_easy_perform(slot->curl);
679 finish_active_slot(slot);
680 }
681 #endif
682 }
683
684 static void closedown_active_slot(struct active_request_slot *slot)
685 {
686 active_requests--;
687 slot->in_use = 0;
688 }
689
690 static void release_active_slot(struct active_request_slot *slot)
691 {
692 closedown_active_slot(slot);
693 if (slot->curl && curl_session_count > min_curl_sessions) {
694 #ifdef USE_CURL_MULTI
695 curl_multi_remove_handle(curlm, slot->curl);
696 #endif
697 curl_easy_cleanup(slot->curl);
698 slot->curl = NULL;
699 curl_session_count--;
700 }
701 #ifdef USE_CURL_MULTI
702 fill_active_slots();
703 #endif
704 }
705
706 void finish_active_slot(struct active_request_slot *slot)
707 {
708 closedown_active_slot(slot);
709 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
710
711 if (slot->finished != NULL)
712 (*slot->finished) = 1;
713
714 /* Store slot results so they can be read after the slot is reused */
715 if (slot->results != NULL) {
716 slot->results->curl_result = slot->curl_result;
717 slot->results->http_code = slot->http_code;
718 }
719
720 /* Run callback if appropriate */
721 if (slot->callback_func != NULL)
722 slot->callback_func(slot->callback_data);
723 }
724
725 void finish_all_active_slots(void)
726 {
727 struct active_request_slot *slot = active_queue_head;
728
729 while (slot != NULL)
730 if (slot->in_use) {
731 run_active_slot(slot);
732 slot = active_queue_head;
733 } else {
734 slot = slot->next;
735 }
736 }
737
738 /* Helpers for modifying and creating URLs */
739 static inline int needs_quote(int ch)
740 {
741 if (((ch >= 'A') && (ch <= 'Z'))
742 || ((ch >= 'a') && (ch <= 'z'))
743 || ((ch >= '0') && (ch <= '9'))
744 || (ch == '/')
745 || (ch == '-')
746 || (ch == '.'))
747 return 0;
748 return 1;
749 }
750
751 static inline int hex(int v)
752 {
753 if (v < 10)
754 return '0' + v;
755 else
756 return 'A' + v - 10;
757 }
758
759 static char *quote_ref_url(const char *base, const char *ref)
760 {
761 struct strbuf buf = STRBUF_INIT;
762 const char *cp;
763 int ch;
764
765 end_url_with_slash(&buf, base);
766
767 for (cp = ref; (ch = *cp) != 0; cp++)
768 if (needs_quote(ch))
769 strbuf_addf(&buf, "%%%02x", ch);
770 else
771 strbuf_addch(&buf, *cp);
772
773 return strbuf_detach(&buf, NULL);
774 }
775
776 void append_remote_object_url(struct strbuf *buf, const char *url,
777 const char *hex,
778 int only_two_digit_prefix)
779 {
780 end_url_with_slash(buf, url);
781
782 strbuf_addf(buf, "objects/%.*s/", 2, hex);
783 if (!only_two_digit_prefix)
784 strbuf_addf(buf, "%s", hex+2);
785 }
786
787 char *get_remote_object_url(const char *url, const char *hex,
788 int only_two_digit_prefix)
789 {
790 struct strbuf buf = STRBUF_INIT;
791 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
792 return strbuf_detach(&buf, NULL);
793 }
794
795 /* http_request() targets */
796 #define HTTP_REQUEST_STRBUF 0
797 #define HTTP_REQUEST_FILE 1
798
799 static int http_request(const char *url, void *result, int target, int options)
800 {
801 struct active_request_slot *slot;
802 struct slot_results results;
803 struct curl_slist *headers = NULL;
804 struct strbuf buf = STRBUF_INIT;
805 int ret;
806
807 slot = get_active_slot();
808 slot->results = &results;
809 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
810
811 if (result == NULL) {
812 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
813 } else {
814 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
815 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
816
817 if (target == HTTP_REQUEST_FILE) {
818 long posn = ftell(result);
819 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
820 fwrite);
821 if (posn > 0) {
822 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
823 headers = curl_slist_append(headers, buf.buf);
824 strbuf_reset(&buf);
825 }
826 slot->local = result;
827 } else
828 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
829 fwrite_buffer);
830 }
831
832 strbuf_addstr(&buf, "Pragma:");
833 if (options & HTTP_NO_CACHE)
834 strbuf_addstr(&buf, " no-cache");
835
836 headers = curl_slist_append(headers, buf.buf);
837
838 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
839 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
840
841 if (start_active_slot(slot)) {
842 run_active_slot(slot);
843 if (results.curl_result == CURLE_OK)
844 ret = HTTP_OK;
845 else if (missing_target(&results))
846 ret = HTTP_MISSING_TARGET;
847 else if (results.http_code == 401) {
848 if (user_name) {
849 ret = HTTP_NOAUTH;
850 } else {
851 /*
852 * git_getpass is needed here because its very likely stdin/stdout are
853 * pipes to our parent process. So we instead need to use /dev/tty,
854 * but that is non-portable. Using git_getpass() can at least be stubbed
855 * on other platforms with a different implementation if/when necessary.
856 */
857 user_name = xstrdup(git_getpass("Username: "));
858 init_curl_http_auth(slot->curl);
859 ret = HTTP_REAUTH;
860 }
861 } else
862 ret = HTTP_ERROR;
863 } else {
864 error("Unable to start HTTP request for %s", url);
865 ret = HTTP_START_FAILED;
866 }
867
868 slot->local = NULL;
869 curl_slist_free_all(headers);
870 strbuf_release(&buf);
871
872 return ret;
873 }
874
875 int http_get_strbuf(const char *url, struct strbuf *result, int options)
876 {
877 int http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
878 if (http_ret == HTTP_REAUTH) {
879 http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
880 }
881 return http_ret;
882 }
883
884 /*
885 * Downloads an url and stores the result in the given file.
886 *
887 * If a previous interrupted download is detected (i.e. a previous temporary
888 * file is still around) the download is resumed.
889 */
890 static int http_get_file(const char *url, const char *filename, int options)
891 {
892 int ret;
893 struct strbuf tmpfile = STRBUF_INIT;
894 FILE *result;
895
896 strbuf_addf(&tmpfile, "%s.temp", filename);
897 result = fopen(tmpfile.buf, "a");
898 if (! result) {
899 error("Unable to open local file %s", tmpfile.buf);
900 ret = HTTP_ERROR;
901 goto cleanup;
902 }
903
904 ret = http_request(url, result, HTTP_REQUEST_FILE, options);
905 fclose(result);
906
907 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
908 ret = HTTP_ERROR;
909 cleanup:
910 strbuf_release(&tmpfile);
911 return ret;
912 }
913
914 int http_error(const char *url, int ret)
915 {
916 /* http_request has already handled HTTP_START_FAILED. */
917 if (ret != HTTP_START_FAILED)
918 error("%s while accessing %s\n", curl_errorstr, url);
919
920 return ret;
921 }
922
923 int http_fetch_ref(const char *base, struct ref *ref)
924 {
925 char *url;
926 struct strbuf buffer = STRBUF_INIT;
927 int ret = -1;
928
929 url = quote_ref_url(base, ref->name);
930 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
931 strbuf_rtrim(&buffer);
932 if (buffer.len == 40)
933 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
934 else if (!prefixcmp(buffer.buf, "ref: ")) {
935 ref->symref = xstrdup(buffer.buf + 5);
936 ret = 0;
937 }
938 }
939
940 strbuf_release(&buffer);
941 free(url);
942 return ret;
943 }
944
945 /* Helpers for fetching packs */
946 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
947 {
948 char *url, *tmp;
949 struct strbuf buf = STRBUF_INIT;
950
951 if (http_is_verbose)
952 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
953
954 end_url_with_slash(&buf, base_url);
955 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
956 url = strbuf_detach(&buf, NULL);
957
958 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
959 tmp = strbuf_detach(&buf, NULL);
960
961 if (http_get_file(url, tmp, 0) != HTTP_OK) {
962 error("Unable to get pack index %s\n", url);
963 free(tmp);
964 tmp = NULL;
965 }
966
967 free(url);
968 return tmp;
969 }
970
971 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
972 unsigned char *sha1, const char *base_url)
973 {
974 struct packed_git *new_pack;
975 char *tmp_idx = NULL;
976 int ret;
977
978 if (has_pack_index(sha1)) {
979 new_pack = parse_pack_index(sha1, NULL);
980 if (!new_pack)
981 return -1; /* parse_pack_index() already issued error message */
982 goto add_pack;
983 }
984
985 tmp_idx = fetch_pack_index(sha1, base_url);
986 if (!tmp_idx)
987 return -1;
988
989 new_pack = parse_pack_index(sha1, tmp_idx);
990 if (!new_pack) {
991 unlink(tmp_idx);
992 free(tmp_idx);
993
994 return -1; /* parse_pack_index() already issued error message */
995 }
996
997 ret = verify_pack_index(new_pack);
998 if (!ret) {
999 close_pack_index(new_pack);
1000 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1001 }
1002 free(tmp_idx);
1003 if (ret)
1004 return -1;
1005
1006 add_pack:
1007 new_pack->next = *packs_head;
1008 *packs_head = new_pack;
1009 return 0;
1010 }
1011
1012 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1013 {
1014 int ret = 0, i = 0;
1015 char *url, *data;
1016 struct strbuf buf = STRBUF_INIT;
1017 unsigned char sha1[20];
1018
1019 end_url_with_slash(&buf, base_url);
1020 strbuf_addstr(&buf, "objects/info/packs");
1021 url = strbuf_detach(&buf, NULL);
1022
1023 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1024 if (ret != HTTP_OK)
1025 goto cleanup;
1026
1027 data = buf.buf;
1028 while (i < buf.len) {
1029 switch (data[i]) {
1030 case 'P':
1031 i++;
1032 if (i + 52 <= buf.len &&
1033 !prefixcmp(data + i, " pack-") &&
1034 !prefixcmp(data + i + 46, ".pack\n")) {
1035 get_sha1_hex(data + i + 6, sha1);
1036 fetch_and_setup_pack_index(packs_head, sha1,
1037 base_url);
1038 i += 51;
1039 break;
1040 }
1041 default:
1042 while (i < buf.len && data[i] != '\n')
1043 i++;
1044 }
1045 i++;
1046 }
1047
1048 cleanup:
1049 free(url);
1050 return ret;
1051 }
1052
1053 void release_http_pack_request(struct http_pack_request *preq)
1054 {
1055 if (preq->packfile != NULL) {
1056 fclose(preq->packfile);
1057 preq->packfile = NULL;
1058 preq->slot->local = NULL;
1059 }
1060 if (preq->range_header != NULL) {
1061 curl_slist_free_all(preq->range_header);
1062 preq->range_header = NULL;
1063 }
1064 preq->slot = NULL;
1065 free(preq->url);
1066 }
1067
1068 int finish_http_pack_request(struct http_pack_request *preq)
1069 {
1070 struct packed_git **lst;
1071 struct packed_git *p = preq->target;
1072 char *tmp_idx;
1073 struct child_process ip;
1074 const char *ip_argv[8];
1075
1076 close_pack_index(p);
1077
1078 fclose(preq->packfile);
1079 preq->packfile = NULL;
1080 preq->slot->local = NULL;
1081
1082 lst = preq->lst;
1083 while (*lst != p)
1084 lst = &((*lst)->next);
1085 *lst = (*lst)->next;
1086
1087 tmp_idx = xstrdup(preq->tmpfile);
1088 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1089 ".idx.temp");
1090
1091 ip_argv[0] = "index-pack";
1092 ip_argv[1] = "-o";
1093 ip_argv[2] = tmp_idx;
1094 ip_argv[3] = preq->tmpfile;
1095 ip_argv[4] = NULL;
1096
1097 memset(&ip, 0, sizeof(ip));
1098 ip.argv = ip_argv;
1099 ip.git_cmd = 1;
1100 ip.no_stdin = 1;
1101 ip.no_stdout = 1;
1102
1103 if (run_command(&ip)) {
1104 unlink(preq->tmpfile);
1105 unlink(tmp_idx);
1106 free(tmp_idx);
1107 return -1;
1108 }
1109
1110 unlink(sha1_pack_index_name(p->sha1));
1111
1112 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1113 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1114 free(tmp_idx);
1115 return -1;
1116 }
1117
1118 install_packed_git(p);
1119 free(tmp_idx);
1120 return 0;
1121 }
1122
1123 struct http_pack_request *new_http_pack_request(
1124 struct packed_git *target, const char *base_url)
1125 {
1126 long prev_posn = 0;
1127 char range[RANGE_HEADER_SIZE];
1128 struct strbuf buf = STRBUF_INIT;
1129 struct http_pack_request *preq;
1130
1131 preq = xmalloc(sizeof(*preq));
1132 preq->target = target;
1133 preq->range_header = NULL;
1134
1135 end_url_with_slash(&buf, base_url);
1136 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1137 sha1_to_hex(target->sha1));
1138 preq->url = strbuf_detach(&buf, NULL);
1139
1140 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1141 sha1_pack_name(target->sha1));
1142 preq->packfile = fopen(preq->tmpfile, "a");
1143 if (!preq->packfile) {
1144 error("Unable to open local file %s for pack",
1145 preq->tmpfile);
1146 goto abort;
1147 }
1148
1149 preq->slot = get_active_slot();
1150 preq->slot->local = preq->packfile;
1151 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1152 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1153 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1154 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1155 no_pragma_header);
1156
1157 /*
1158 * If there is data present from a previous transfer attempt,
1159 * resume where it left off
1160 */
1161 prev_posn = ftell(preq->packfile);
1162 if (prev_posn>0) {
1163 if (http_is_verbose)
1164 fprintf(stderr,
1165 "Resuming fetch of pack %s at byte %ld\n",
1166 sha1_to_hex(target->sha1), prev_posn);
1167 sprintf(range, "Range: bytes=%ld-", prev_posn);
1168 preq->range_header = curl_slist_append(NULL, range);
1169 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1170 preq->range_header);
1171 }
1172
1173 return preq;
1174
1175 abort:
1176 free(preq->url);
1177 free(preq);
1178 return NULL;
1179 }
1180
1181 /* Helpers for fetching objects (loose) */
1182 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
1183 void *data)
1184 {
1185 unsigned char expn[4096];
1186 size_t size = eltsize * nmemb;
1187 int posn = 0;
1188 struct http_object_request *freq =
1189 (struct http_object_request *)data;
1190 do {
1191 ssize_t retval = xwrite(freq->localfile,
1192 (char *) ptr + posn, size - posn);
1193 if (retval < 0)
1194 return posn;
1195 posn += retval;
1196 } while (posn < size);
1197
1198 freq->stream.avail_in = size;
1199 freq->stream.next_in = ptr;
1200 do {
1201 freq->stream.next_out = expn;
1202 freq->stream.avail_out = sizeof(expn);
1203 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1204 git_SHA1_Update(&freq->c, expn,
1205 sizeof(expn) - freq->stream.avail_out);
1206 } while (freq->stream.avail_in && freq->zret == Z_OK);
1207 data_received++;
1208 return size;
1209 }
1210
1211 struct http_object_request *new_http_object_request(const char *base_url,
1212 unsigned char *sha1)
1213 {
1214 char *hex = sha1_to_hex(sha1);
1215 char *filename;
1216 char prevfile[PATH_MAX];
1217 int prevlocal;
1218 unsigned char prev_buf[PREV_BUF_SIZE];
1219 ssize_t prev_read = 0;
1220 long prev_posn = 0;
1221 char range[RANGE_HEADER_SIZE];
1222 struct curl_slist *range_header = NULL;
1223 struct http_object_request *freq;
1224
1225 freq = xmalloc(sizeof(*freq));
1226 hashcpy(freq->sha1, sha1);
1227 freq->localfile = -1;
1228
1229 filename = sha1_file_name(sha1);
1230 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1231 "%s.temp", filename);
1232
1233 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1234 unlink_or_warn(prevfile);
1235 rename(freq->tmpfile, prevfile);
1236 unlink_or_warn(freq->tmpfile);
1237
1238 if (freq->localfile != -1)
1239 error("fd leakage in start: %d", freq->localfile);
1240 freq->localfile = open(freq->tmpfile,
1241 O_WRONLY | O_CREAT | O_EXCL, 0666);
1242 /*
1243 * This could have failed due to the "lazy directory creation";
1244 * try to mkdir the last path component.
1245 */
1246 if (freq->localfile < 0 && errno == ENOENT) {
1247 char *dir = strrchr(freq->tmpfile, '/');
1248 if (dir) {
1249 *dir = 0;
1250 mkdir(freq->tmpfile, 0777);
1251 *dir = '/';
1252 }
1253 freq->localfile = open(freq->tmpfile,
1254 O_WRONLY | O_CREAT | O_EXCL, 0666);
1255 }
1256
1257 if (freq->localfile < 0) {
1258 error("Couldn't create temporary file %s: %s",
1259 freq->tmpfile, strerror(errno));
1260 goto abort;
1261 }
1262
1263 memset(&freq->stream, 0, sizeof(freq->stream));
1264
1265 git_inflate_init(&freq->stream);
1266
1267 git_SHA1_Init(&freq->c);
1268
1269 freq->url = get_remote_object_url(base_url, hex, 0);
1270
1271 /*
1272 * If a previous temp file is present, process what was already
1273 * fetched.
1274 */
1275 prevlocal = open(prevfile, O_RDONLY);
1276 if (prevlocal != -1) {
1277 do {
1278 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1279 if (prev_read>0) {
1280 if (fwrite_sha1_file(prev_buf,
1281 1,
1282 prev_read,
1283 freq) == prev_read) {
1284 prev_posn += prev_read;
1285 } else {
1286 prev_read = -1;
1287 }
1288 }
1289 } while (prev_read > 0);
1290 close(prevlocal);
1291 }
1292 unlink_or_warn(prevfile);
1293
1294 /*
1295 * Reset inflate/SHA1 if there was an error reading the previous temp
1296 * file; also rewind to the beginning of the local file.
1297 */
1298 if (prev_read == -1) {
1299 memset(&freq->stream, 0, sizeof(freq->stream));
1300 git_inflate_init(&freq->stream);
1301 git_SHA1_Init(&freq->c);
1302 if (prev_posn>0) {
1303 prev_posn = 0;
1304 lseek(freq->localfile, 0, SEEK_SET);
1305 if (ftruncate(freq->localfile, 0) < 0) {
1306 error("Couldn't truncate temporary file %s: %s",
1307 freq->tmpfile, strerror(errno));
1308 goto abort;
1309 }
1310 }
1311 }
1312
1313 freq->slot = get_active_slot();
1314
1315 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1316 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1317 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1318 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1319 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1320
1321 /*
1322 * If we have successfully processed data from a previous fetch
1323 * attempt, only fetch the data we don't already have.
1324 */
1325 if (prev_posn>0) {
1326 if (http_is_verbose)
1327 fprintf(stderr,
1328 "Resuming fetch of object %s at byte %ld\n",
1329 hex, prev_posn);
1330 sprintf(range, "Range: bytes=%ld-", prev_posn);
1331 range_header = curl_slist_append(range_header, range);
1332 curl_easy_setopt(freq->slot->curl,
1333 CURLOPT_HTTPHEADER, range_header);
1334 }
1335
1336 return freq;
1337
1338 abort:
1339 free(filename);
1340 free(freq->url);
1341 free(freq);
1342 return NULL;
1343 }
1344
1345 void process_http_object_request(struct http_object_request *freq)
1346 {
1347 if (freq->slot == NULL)
1348 return;
1349 freq->curl_result = freq->slot->curl_result;
1350 freq->http_code = freq->slot->http_code;
1351 freq->slot = NULL;
1352 }
1353
1354 int finish_http_object_request(struct http_object_request *freq)
1355 {
1356 struct stat st;
1357
1358 close(freq->localfile);
1359 freq->localfile = -1;
1360
1361 process_http_object_request(freq);
1362
1363 if (freq->http_code == 416) {
1364 warning("requested range invalid; we may already have all the data.");
1365 } else if (freq->curl_result != CURLE_OK) {
1366 if (stat(freq->tmpfile, &st) == 0)
1367 if (st.st_size == 0)
1368 unlink_or_warn(freq->tmpfile);
1369 return -1;
1370 }
1371
1372 git_inflate_end(&freq->stream);
1373 git_SHA1_Final(freq->real_sha1, &freq->c);
1374 if (freq->zret != Z_STREAM_END) {
1375 unlink_or_warn(freq->tmpfile);
1376 return -1;
1377 }
1378 if (hashcmp(freq->sha1, freq->real_sha1)) {
1379 unlink_or_warn(freq->tmpfile);
1380 return -1;
1381 }
1382 freq->rename =
1383 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1384
1385 return freq->rename;
1386 }
1387
1388 void abort_http_object_request(struct http_object_request *freq)
1389 {
1390 unlink_or_warn(freq->tmpfile);
1391
1392 release_http_object_request(freq);
1393 }
1394
1395 void release_http_object_request(struct http_object_request *freq)
1396 {
1397 if (freq->localfile != -1) {
1398 close(freq->localfile);
1399 freq->localfile = -1;
1400 }
1401 if (freq->url != NULL) {
1402 free(freq->url);
1403 freq->url = NULL;
1404 }
1405 if (freq->slot != NULL) {
1406 freq->slot->callback_func = NULL;
1407 freq->slot->callback_data = NULL;
1408 release_active_slot(freq->slot);
1409 freq->slot = NULL;
1410 }
1411 }
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