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request-pull: use the real fork point when preparing the message
[git/jnareb-git.git] / http.c
bloba59cac45d7a6c159e740cab9b20bb63ab91f7c48
1 #include "http.h"
2 #include "pack.h"
3 #include "sideband.h"
4 #include "run-command.h"
5 #include "url.h"
6
7 int data_received;
8 int active_requests;
9 int http_is_verbose;
10 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
11
12 #if LIBCURL_VERSION_NUM >= 0x070a06
13 #define LIBCURL_CAN_HANDLE_AUTH_ANY
14 #endif
15
16 static int min_curl_sessions = 1;
17 static int curl_session_count;
18 #ifdef USE_CURL_MULTI
19 static int max_requests = -1;
20 static CURLM *curlm;
21 #endif
22 #ifndef NO_CURL_EASY_DUPHANDLE
23 static CURL *curl_default;
24 #endif
25
26 #define PREV_BUF_SIZE 4096
27 #define RANGE_HEADER_SIZE 30
28
29 char curl_errorstr[CURL_ERROR_SIZE];
30
31 static int curl_ssl_verify = -1;
32 static const char *ssl_cert;
33 #if LIBCURL_VERSION_NUM >= 0x070903
34 static const char *ssl_key;
35 #endif
36 #if LIBCURL_VERSION_NUM >= 0x070908
37 static const char *ssl_capath;
38 #endif
39 static const char *ssl_cainfo;
40 static long curl_low_speed_limit = -1;
41 static long curl_low_speed_time = -1;
42 static int curl_ftp_no_epsv;
43 static const char *curl_http_proxy;
44 static const char *curl_cookie_file;
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(char *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(char *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(char *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 http_options(const char *var, const char *value, void *cb)
143 {
144 if (!strcmp("http.sslverify", var)) {
145 curl_ssl_verify = git_config_bool(var, value);
146 return 0;
147 }
148 if (!strcmp("http.sslcert", var))
149 return git_config_string(&ssl_cert, var, value);
150 #if LIBCURL_VERSION_NUM >= 0x070903
151 if (!strcmp("http.sslkey", var))
152 return git_config_string(&ssl_key, var, value);
153 #endif
154 #if LIBCURL_VERSION_NUM >= 0x070908
155 if (!strcmp("http.sslcapath", var))
156 return git_config_string(&ssl_capath, var, value);
157 #endif
158 if (!strcmp("http.sslcainfo", var))
159 return git_config_string(&ssl_cainfo, var, value);
160 if (!strcmp("http.sslcertpasswordprotected", var)) {
161 if (git_config_bool(var, value))
162 ssl_cert_password_required = 1;
163 return 0;
164 }
165 if (!strcmp("http.minsessions", var)) {
166 min_curl_sessions = git_config_int(var, value);
167 #ifndef USE_CURL_MULTI
168 if (min_curl_sessions > 1)
169 min_curl_sessions = 1;
170 #endif
171 return 0;
172 }
173 #ifdef USE_CURL_MULTI
174 if (!strcmp("http.maxrequests", var)) {
175 max_requests = git_config_int(var, value);
176 return 0;
177 }
178 #endif
179 if (!strcmp("http.lowspeedlimit", var)) {
180 curl_low_speed_limit = (long)git_config_int(var, value);
181 return 0;
182 }
183 if (!strcmp("http.lowspeedtime", var)) {
184 curl_low_speed_time = (long)git_config_int(var, value);
185 return 0;
186 }
187
188 if (!strcmp("http.noepsv", var)) {
189 curl_ftp_no_epsv = git_config_bool(var, value);
190 return 0;
191 }
192 if (!strcmp("http.proxy", var))
193 return git_config_string(&curl_http_proxy, var, value);
194
195 if (!strcmp("http.cookiefile", var))
196 return git_config_string(&curl_cookie_file, var, value);
197
198 if (!strcmp("http.postbuffer", var)) {
199 http_post_buffer = git_config_int(var, value);
200 if (http_post_buffer < LARGE_PACKET_MAX)
201 http_post_buffer = LARGE_PACKET_MAX;
202 return 0;
203 }
204
205 if (!strcmp("http.useragent", var))
206 return git_config_string(&user_agent, var, value);
207
208 /* Fall back on the default ones */
209 return git_default_config(var, value, cb);
210 }
211
212 static void init_curl_http_auth(CURL *result)
213 {
214 if (user_name) {
215 struct strbuf up = STRBUF_INIT;
216 if (!user_pass)
217 user_pass = xstrdup(git_getpass("Password: "));
218 strbuf_addf(&up, "%s:%s", user_name, user_pass);
219 curl_easy_setopt(result, CURLOPT_USERPWD,
220 strbuf_detach(&up, NULL));
221 }
222 }
223
224 static int has_cert_password(void)
225 {
226 if (ssl_cert_password != NULL)
227 return 1;
228 if (ssl_cert == NULL || ssl_cert_password_required != 1)
229 return 0;
230 /* Only prompt the user once. */
231 ssl_cert_password_required = -1;
232 ssl_cert_password = git_getpass("Certificate Password: ");
233 if (ssl_cert_password != NULL) {
234 ssl_cert_password = xstrdup(ssl_cert_password);
235 return 1;
236 } else
237 return 0;
238 }
239
240 static CURL *get_curl_handle(void)
241 {
242 CURL *result = curl_easy_init();
243
244 if (!curl_ssl_verify) {
245 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
246 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
247 } else {
248 /* Verify authenticity of the peer's certificate */
249 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
250 /* The name in the cert must match whom we tried to connect */
251 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
252 }
253
254 #if LIBCURL_VERSION_NUM >= 0x070907
255 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
256 #endif
257 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
258 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
259 #endif
260
261 init_curl_http_auth(result);
262
263 if (ssl_cert != NULL)
264 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
265 if (has_cert_password())
266 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
267 #if LIBCURL_VERSION_NUM >= 0x070903
268 if (ssl_key != NULL)
269 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
270 #endif
271 #if LIBCURL_VERSION_NUM >= 0x070908
272 if (ssl_capath != NULL)
273 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
274 #endif
275 if (ssl_cainfo != NULL)
276 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
277 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
278
279 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
280 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
281 curl_low_speed_limit);
282 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
283 curl_low_speed_time);
284 }
285
286 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
287 #if LIBCURL_VERSION_NUM >= 0x071301
288 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
289 #elif LIBCURL_VERSION_NUM >= 0x071101
290 curl_easy_setopt(result, CURLOPT_POST301, 1);
291 #endif
292
293 if (getenv("GIT_CURL_VERBOSE"))
294 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
295
296 curl_easy_setopt(result, CURLOPT_USERAGENT,
297 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
298
299 if (curl_ftp_no_epsv)
300 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
301
302 if (curl_http_proxy)
303 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
304
305 return result;
306 }
307
308 static void http_auth_init(const char *url)
309 {
310 char *at, *colon, *cp, *slash, *decoded;
311 int len;
312
313 cp = strstr(url, "://");
314 if (!cp)
315 return;
316
317 /*
318 * Ok, the URL looks like "proto://something". Which one?
319 * "proto://<user>:<pass>@<host>/...",
320 * "proto://<user>@<host>/...", or just
321 * "proto://<host>/..."?
322 */
323 cp += 3;
324 at = strchr(cp, '@');
325 colon = strchr(cp, ':');
326 slash = strchrnul(cp, '/');
327 if (!at || slash <= at)
328 return; /* No credentials */
329 if (!colon || at <= colon) {
330 /* Only username */
331 len = at - cp;
332 user_name = xmalloc(len + 1);
333 memcpy(user_name, cp, len);
334 user_name[len] = '\0';
335 decoded = url_decode(user_name);
336 free(user_name);
337 user_name = decoded;
338 user_pass = NULL;
339 } else {
340 len = colon - 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 len = at - (colon + 1);
348 user_pass = xmalloc(len + 1);
349 memcpy(user_pass, colon + 1, len);
350 user_pass[len] = '\0';
351 decoded = url_decode(user_pass);
352 free(user_pass);
353 user_pass = decoded;
354 }
355 }
356
357 static void set_from_env(const char **var, const char *envname)
358 {
359 const char *val = getenv(envname);
360 if (val)
361 *var = val;
362 }
363
364 void http_init(struct remote *remote)
365 {
366 char *low_speed_limit;
367 char *low_speed_time;
368
369 http_is_verbose = 0;
370
371 git_config(http_options, NULL);
372
373 curl_global_init(CURL_GLOBAL_ALL);
374
375 if (remote && remote->http_proxy)
376 curl_http_proxy = xstrdup(remote->http_proxy);
377
378 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
379 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
380
381 #ifdef USE_CURL_MULTI
382 {
383 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
384 if (http_max_requests != NULL)
385 max_requests = atoi(http_max_requests);
386 }
387
388 curlm = curl_multi_init();
389 if (curlm == NULL) {
390 fprintf(stderr, "Error creating curl multi handle.\n");
391 exit(1);
392 }
393 #endif
394
395 if (getenv("GIT_SSL_NO_VERIFY"))
396 curl_ssl_verify = 0;
397
398 set_from_env(&ssl_cert, "GIT_SSL_CERT");
399 #if LIBCURL_VERSION_NUM >= 0x070903
400 set_from_env(&ssl_key, "GIT_SSL_KEY");
401 #endif
402 #if LIBCURL_VERSION_NUM >= 0x070908
403 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
404 #endif
405 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
406
407 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
408
409 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
410 if (low_speed_limit != NULL)
411 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
412 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
413 if (low_speed_time != NULL)
414 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
415
416 if (curl_ssl_verify == -1)
417 curl_ssl_verify = 1;
418
419 curl_session_count = 0;
420 #ifdef USE_CURL_MULTI
421 if (max_requests < 1)
422 max_requests = DEFAULT_MAX_REQUESTS;
423 #endif
424
425 if (getenv("GIT_CURL_FTP_NO_EPSV"))
426 curl_ftp_no_epsv = 1;
427
428 if (remote && remote->url && remote->url[0]) {
429 http_auth_init(remote->url[0]);
430 if (!ssl_cert_password_required &&
431 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
432 !prefixcmp(remote->url[0], "https://"))
433 ssl_cert_password_required = 1;
434 }
435
436 #ifndef NO_CURL_EASY_DUPHANDLE
437 curl_default = get_curl_handle();
438 #endif
439 }
440
441 void http_cleanup(void)
442 {
443 struct active_request_slot *slot = active_queue_head;
444
445 while (slot != NULL) {
446 struct active_request_slot *next = slot->next;
447 if (slot->curl != NULL) {
448 #ifdef USE_CURL_MULTI
449 curl_multi_remove_handle(curlm, slot->curl);
450 #endif
451 curl_easy_cleanup(slot->curl);
452 }
453 free(slot);
454 slot = next;
455 }
456 active_queue_head = NULL;
457
458 #ifndef NO_CURL_EASY_DUPHANDLE
459 curl_easy_cleanup(curl_default);
460 #endif
461
462 #ifdef USE_CURL_MULTI
463 curl_multi_cleanup(curlm);
464 #endif
465 curl_global_cleanup();
466
467 curl_slist_free_all(pragma_header);
468 pragma_header = NULL;
469
470 curl_slist_free_all(no_pragma_header);
471 no_pragma_header = NULL;
472
473 if (curl_http_proxy) {
474 free((void *)curl_http_proxy);
475 curl_http_proxy = NULL;
476 }
477
478 if (ssl_cert_password != NULL) {
479 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
480 free(ssl_cert_password);
481 ssl_cert_password = NULL;
482 }
483 ssl_cert_password_required = 0;
484 }
485
486 struct active_request_slot *get_active_slot(void)
487 {
488 struct active_request_slot *slot = active_queue_head;
489 struct active_request_slot *newslot;
490
491 #ifdef USE_CURL_MULTI
492 int num_transfers;
493
494 /* Wait for a slot to open up if the queue is full */
495 while (active_requests >= max_requests) {
496 curl_multi_perform(curlm, &num_transfers);
497 if (num_transfers < active_requests)
498 process_curl_messages();
499 }
500 #endif
501
502 while (slot != NULL && slot->in_use)
503 slot = slot->next;
504
505 if (slot == NULL) {
506 newslot = xmalloc(sizeof(*newslot));
507 newslot->curl = NULL;
508 newslot->in_use = 0;
509 newslot->next = NULL;
510
511 slot = active_queue_head;
512 if (slot == NULL) {
513 active_queue_head = newslot;
514 } else {
515 while (slot->next != NULL)
516 slot = slot->next;
517 slot->next = newslot;
518 }
519 slot = newslot;
520 }
521
522 if (slot->curl == NULL) {
523 #ifdef NO_CURL_EASY_DUPHANDLE
524 slot->curl = get_curl_handle();
525 #else
526 slot->curl = curl_easy_duphandle(curl_default);
527 #endif
528 curl_session_count++;
529 }
530
531 active_requests++;
532 slot->in_use = 1;
533 slot->local = NULL;
534 slot->results = NULL;
535 slot->finished = NULL;
536 slot->callback_data = NULL;
537 slot->callback_func = NULL;
538 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
539 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
540 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
541 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
542 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
543 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
544 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
545 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
546 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
547
548 return slot;
549 }
550
551 int start_active_slot(struct active_request_slot *slot)
552 {
553 #ifdef USE_CURL_MULTI
554 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
555 int num_transfers;
556
557 if (curlm_result != CURLM_OK &&
558 curlm_result != CURLM_CALL_MULTI_PERFORM) {
559 active_requests--;
560 slot->in_use = 0;
561 return 0;
562 }
563
564 /*
565 * We know there must be something to do, since we just added
566 * something.
567 */
568 curl_multi_perform(curlm, &num_transfers);
569 #endif
570 return 1;
571 }
572
573 #ifdef USE_CURL_MULTI
574 struct fill_chain {
575 void *data;
576 int (*fill)(void *);
577 struct fill_chain *next;
578 };
579
580 static struct fill_chain *fill_cfg;
581
582 void add_fill_function(void *data, int (*fill)(void *))
583 {
584 struct fill_chain *new = xmalloc(sizeof(*new));
585 struct fill_chain **linkp = &fill_cfg;
586 new->data = data;
587 new->fill = fill;
588 new->next = NULL;
589 while (*linkp)
590 linkp = &(*linkp)->next;
591 *linkp = new;
592 }
593
594 void fill_active_slots(void)
595 {
596 struct active_request_slot *slot = active_queue_head;
597
598 while (active_requests < max_requests) {
599 struct fill_chain *fill;
600 for (fill = fill_cfg; fill; fill = fill->next)
601 if (fill->fill(fill->data))
602 break;
603
604 if (!fill)
605 break;
606 }
607
608 while (slot != NULL) {
609 if (!slot->in_use && slot->curl != NULL
610 && curl_session_count > min_curl_sessions) {
611 curl_easy_cleanup(slot->curl);
612 slot->curl = NULL;
613 curl_session_count--;
614 }
615 slot = slot->next;
616 }
617 }
618
619 void step_active_slots(void)
620 {
621 int num_transfers;
622 CURLMcode curlm_result;
623
624 do {
625 curlm_result = curl_multi_perform(curlm, &num_transfers);
626 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
627 if (num_transfers < active_requests) {
628 process_curl_messages();
629 fill_active_slots();
630 }
631 }
632 #endif
633
634 void run_active_slot(struct active_request_slot *slot)
635 {
636 #ifdef USE_CURL_MULTI
637 long last_pos = 0;
638 long current_pos;
639 fd_set readfds;
640 fd_set writefds;
641 fd_set excfds;
642 int max_fd;
643 struct timeval select_timeout;
644 int finished = 0;
645
646 slot->finished = &finished;
647 while (!finished) {
648 data_received = 0;
649 step_active_slots();
650
651 if (!data_received && slot->local != NULL) {
652 current_pos = ftell(slot->local);
653 if (current_pos > last_pos)
654 data_received++;
655 last_pos = current_pos;
656 }
657
658 if (slot->in_use && !data_received) {
659 max_fd = 0;
660 FD_ZERO(&readfds);
661 FD_ZERO(&writefds);
662 FD_ZERO(&excfds);
663 select_timeout.tv_sec = 0;
664 select_timeout.tv_usec = 50000;
665 select(max_fd, &readfds, &writefds,
666 &excfds, &select_timeout);
667 }
668 }
669 #else
670 while (slot->in_use) {
671 slot->curl_result = curl_easy_perform(slot->curl);
672 finish_active_slot(slot);
673 }
674 #endif
675 }
676
677 static void closedown_active_slot(struct active_request_slot *slot)
678 {
679 active_requests--;
680 slot->in_use = 0;
681 }
682
683 static void release_active_slot(struct active_request_slot *slot)
684 {
685 closedown_active_slot(slot);
686 if (slot->curl && curl_session_count > min_curl_sessions) {
687 #ifdef USE_CURL_MULTI
688 curl_multi_remove_handle(curlm, slot->curl);
689 #endif
690 curl_easy_cleanup(slot->curl);
691 slot->curl = NULL;
692 curl_session_count--;
693 }
694 #ifdef USE_CURL_MULTI
695 fill_active_slots();
696 #endif
697 }
698
699 void finish_active_slot(struct active_request_slot *slot)
700 {
701 closedown_active_slot(slot);
702 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
703
704 if (slot->finished != NULL)
705 (*slot->finished) = 1;
706
707 /* Store slot results so they can be read after the slot is reused */
708 if (slot->results != NULL) {
709 slot->results->curl_result = slot->curl_result;
710 slot->results->http_code = slot->http_code;
711 }
712
713 /* Run callback if appropriate */
714 if (slot->callback_func != NULL)
715 slot->callback_func(slot->callback_data);
716 }
717
718 void finish_all_active_slots(void)
719 {
720 struct active_request_slot *slot = active_queue_head;
721
722 while (slot != NULL)
723 if (slot->in_use) {
724 run_active_slot(slot);
725 slot = active_queue_head;
726 } else {
727 slot = slot->next;
728 }
729 }
730
731 /* Helpers for modifying and creating URLs */
732 static inline int needs_quote(int ch)
733 {
734 if (((ch >= 'A') && (ch <= 'Z'))
735 || ((ch >= 'a') && (ch <= 'z'))
736 || ((ch >= '0') && (ch <= '9'))
737 || (ch == '/')
738 || (ch == '-')
739 || (ch == '.'))
740 return 0;
741 return 1;
742 }
743
744 static inline int hex(int v)
745 {
746 if (v < 10)
747 return '0' + v;
748 else
749 return 'A' + v - 10;
750 }
751
752 static char *quote_ref_url(const char *base, const char *ref)
753 {
754 struct strbuf buf = STRBUF_INIT;
755 const char *cp;
756 int ch;
757
758 end_url_with_slash(&buf, base);
759
760 for (cp = ref; (ch = *cp) != 0; cp++)
761 if (needs_quote(ch))
762 strbuf_addf(&buf, "%%%02x", ch);
763 else
764 strbuf_addch(&buf, *cp);
765
766 return strbuf_detach(&buf, NULL);
767 }
768
769 void append_remote_object_url(struct strbuf *buf, const char *url,
770 const char *hex,
771 int only_two_digit_prefix)
772 {
773 end_url_with_slash(buf, url);
774
775 strbuf_addf(buf, "objects/%.*s/", 2, hex);
776 if (!only_two_digit_prefix)
777 strbuf_addf(buf, "%s", hex+2);
778 }
779
780 char *get_remote_object_url(const char *url, const char *hex,
781 int only_two_digit_prefix)
782 {
783 struct strbuf buf = STRBUF_INIT;
784 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
785 return strbuf_detach(&buf, NULL);
786 }
787
788 /* http_request() targets */
789 #define HTTP_REQUEST_STRBUF 0
790 #define HTTP_REQUEST_FILE 1
791
792 static int http_request(const char *url, void *result, int target, int options)
793 {
794 struct active_request_slot *slot;
795 struct slot_results results;
796 struct curl_slist *headers = NULL;
797 struct strbuf buf = STRBUF_INIT;
798 int ret;
799
800 slot = get_active_slot();
801 slot->results = &results;
802 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
803
804 if (result == NULL) {
805 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
806 } else {
807 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
808 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
809
810 if (target == HTTP_REQUEST_FILE) {
811 long posn = ftell(result);
812 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
813 fwrite);
814 if (posn > 0) {
815 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
816 headers = curl_slist_append(headers, buf.buf);
817 strbuf_reset(&buf);
818 }
819 slot->local = result;
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
834 if (start_active_slot(slot)) {
835 run_active_slot(slot);
836 if (results.curl_result == CURLE_OK)
837 ret = HTTP_OK;
838 else if (missing_target(&results))
839 ret = HTTP_MISSING_TARGET;
840 else if (results.http_code == 401) {
841 if (user_name) {
842 ret = HTTP_NOAUTH;
843 } else {
844 /*
845 * git_getpass is needed here because its very likely stdin/stdout are
846 * pipes to our parent process. So we instead need to use /dev/tty,
847 * but that is non-portable. Using git_getpass() can at least be stubbed
848 * on other platforms with a different implementation if/when necessary.
849 */
850 user_name = xstrdup(git_getpass("Username: "));
851 init_curl_http_auth(slot->curl);
852 ret = HTTP_REAUTH;
853 }
854 } else
855 ret = HTTP_ERROR;
856 } else {
857 error("Unable to start HTTP request for %s", url);
858 ret = HTTP_START_FAILED;
859 }
860
861 slot->local = NULL;
862 curl_slist_free_all(headers);
863 strbuf_release(&buf);
864
865 return ret;
866 }
867
868 int http_get_strbuf(const char *url, struct strbuf *result, int options)
869 {
870 int http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
871 if (http_ret == HTTP_REAUTH) {
872 http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
873 }
874 return http_ret;
875 }
876
877 /*
878 * Downloads an url and stores the result in the given file.
879 *
880 * If a previous interrupted download is detected (i.e. a previous temporary
881 * file is still around) the download is resumed.
882 */
883 static int http_get_file(const char *url, const char *filename, int options)
884 {
885 int ret;
886 struct strbuf tmpfile = STRBUF_INIT;
887 FILE *result;
888
889 strbuf_addf(&tmpfile, "%s.temp", filename);
890 result = fopen(tmpfile.buf, "a");
891 if (! result) {
892 error("Unable to open local file %s", tmpfile.buf);
893 ret = HTTP_ERROR;
894 goto cleanup;
895 }
896
897 ret = http_request(url, result, HTTP_REQUEST_FILE, options);
898 fclose(result);
899
900 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
901 ret = HTTP_ERROR;
902 cleanup:
903 strbuf_release(&tmpfile);
904 return ret;
905 }
906
907 int http_error(const char *url, int ret)
908 {
909 /* http_request has already handled HTTP_START_FAILED. */
910 if (ret != HTTP_START_FAILED)
911 error("%s while accessing %s\n", curl_errorstr, url);
912
913 return ret;
914 }
915
916 int http_fetch_ref(const char *base, struct ref *ref)
917 {
918 char *url;
919 struct strbuf buffer = STRBUF_INIT;
920 int ret = -1;
921
922 url = quote_ref_url(base, ref->name);
923 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
924 strbuf_rtrim(&buffer);
925 if (buffer.len == 40)
926 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
927 else if (!prefixcmp(buffer.buf, "ref: ")) {
928 ref->symref = xstrdup(buffer.buf + 5);
929 ret = 0;
930 }
931 }
932
933 strbuf_release(&buffer);
934 free(url);
935 return ret;
936 }
937
938 /* Helpers for fetching packs */
939 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
940 {
941 char *url, *tmp;
942 struct strbuf buf = STRBUF_INIT;
943
944 if (http_is_verbose)
945 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
946
947 end_url_with_slash(&buf, base_url);
948 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
949 url = strbuf_detach(&buf, NULL);
950
951 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
952 tmp = strbuf_detach(&buf, NULL);
953
954 if (http_get_file(url, tmp, 0) != HTTP_OK) {
955 error("Unable to get pack index %s\n", url);
956 free(tmp);
957 tmp = NULL;
958 }
959
960 free(url);
961 return tmp;
962 }
963
964 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
965 unsigned char *sha1, const char *base_url)
966 {
967 struct packed_git *new_pack;
968 char *tmp_idx = NULL;
969 int ret;
970
971 if (has_pack_index(sha1)) {
972 new_pack = parse_pack_index(sha1, NULL);
973 if (!new_pack)
974 return -1; /* parse_pack_index() already issued error message */
975 goto add_pack;
976 }
977
978 tmp_idx = fetch_pack_index(sha1, base_url);
979 if (!tmp_idx)
980 return -1;
981
982 new_pack = parse_pack_index(sha1, tmp_idx);
983 if (!new_pack) {
984 unlink(tmp_idx);
985 free(tmp_idx);
986
987 return -1; /* parse_pack_index() already issued error message */
988 }
989
990 ret = verify_pack_index(new_pack);
991 if (!ret) {
992 close_pack_index(new_pack);
993 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
994 }
995 free(tmp_idx);
996 if (ret)
997 return -1;
998
999 add_pack:
1000 new_pack->next = *packs_head;
1001 *packs_head = new_pack;
1002 return 0;
1003 }
1004
1005 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1006 {
1007 int ret = 0, i = 0;
1008 char *url, *data;
1009 struct strbuf buf = STRBUF_INIT;
1010 unsigned char sha1[20];
1011
1012 end_url_with_slash(&buf, base_url);
1013 strbuf_addstr(&buf, "objects/info/packs");
1014 url = strbuf_detach(&buf, NULL);
1015
1016 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1017 if (ret != HTTP_OK)
1018 goto cleanup;
1019
1020 data = buf.buf;
1021 while (i < buf.len) {
1022 switch (data[i]) {
1023 case 'P':
1024 i++;
1025 if (i + 52 <= buf.len &&
1026 !prefixcmp(data + i, " pack-") &&
1027 !prefixcmp(data + i + 46, ".pack\n")) {
1028 get_sha1_hex(data + i + 6, sha1);
1029 fetch_and_setup_pack_index(packs_head, sha1,
1030 base_url);
1031 i += 51;
1032 break;
1033 }
1034 default:
1035 while (i < buf.len && data[i] != '\n')
1036 i++;
1037 }
1038 i++;
1039 }
1040
1041 cleanup:
1042 free(url);
1043 return ret;
1044 }
1045
1046 void release_http_pack_request(struct http_pack_request *preq)
1047 {
1048 if (preq->packfile != NULL) {
1049 fclose(preq->packfile);
1050 preq->packfile = NULL;
1051 preq->slot->local = NULL;
1052 }
1053 if (preq->range_header != NULL) {
1054 curl_slist_free_all(preq->range_header);
1055 preq->range_header = NULL;
1056 }
1057 preq->slot = NULL;
1058 free(preq->url);
1059 }
1060
1061 int finish_http_pack_request(struct http_pack_request *preq)
1062 {
1063 struct packed_git **lst;
1064 struct packed_git *p = preq->target;
1065 char *tmp_idx;
1066 struct child_process ip;
1067 const char *ip_argv[8];
1068
1069 close_pack_index(p);
1070
1071 fclose(preq->packfile);
1072 preq->packfile = NULL;
1073 preq->slot->local = NULL;
1074
1075 lst = preq->lst;
1076 while (*lst != p)
1077 lst = &((*lst)->next);
1078 *lst = (*lst)->next;
1079
1080 tmp_idx = xstrdup(preq->tmpfile);
1081 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1082 ".idx.temp");
1083
1084 ip_argv[0] = "index-pack";
1085 ip_argv[1] = "-o";
1086 ip_argv[2] = tmp_idx;
1087 ip_argv[3] = preq->tmpfile;
1088 ip_argv[4] = NULL;
1089
1090 memset(&ip, 0, sizeof(ip));
1091 ip.argv = ip_argv;
1092 ip.git_cmd = 1;
1093 ip.no_stdin = 1;
1094 ip.no_stdout = 1;
1095
1096 if (run_command(&ip)) {
1097 unlink(preq->tmpfile);
1098 unlink(tmp_idx);
1099 free(tmp_idx);
1100 return -1;
1101 }
1102
1103 unlink(sha1_pack_index_name(p->sha1));
1104
1105 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1106 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1107 free(tmp_idx);
1108 return -1;
1109 }
1110
1111 install_packed_git(p);
1112 free(tmp_idx);
1113 return 0;
1114 }
1115
1116 struct http_pack_request *new_http_pack_request(
1117 struct packed_git *target, const char *base_url)
1118 {
1119 long prev_posn = 0;
1120 char range[RANGE_HEADER_SIZE];
1121 struct strbuf buf = STRBUF_INIT;
1122 struct http_pack_request *preq;
1123
1124 preq = xcalloc(1, sizeof(*preq));
1125 preq->target = target;
1126
1127 end_url_with_slash(&buf, base_url);
1128 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1129 sha1_to_hex(target->sha1));
1130 preq->url = strbuf_detach(&buf, NULL);
1131
1132 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1133 sha1_pack_name(target->sha1));
1134 preq->packfile = fopen(preq->tmpfile, "a");
1135 if (!preq->packfile) {
1136 error("Unable to open local file %s for pack",
1137 preq->tmpfile);
1138 goto abort;
1139 }
1140
1141 preq->slot = get_active_slot();
1142 preq->slot->local = preq->packfile;
1143 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1144 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1145 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1146 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1147 no_pragma_header);
1148
1149 /*
1150 * If there is data present from a previous transfer attempt,
1151 * resume where it left off
1152 */
1153 prev_posn = ftell(preq->packfile);
1154 if (prev_posn>0) {
1155 if (http_is_verbose)
1156 fprintf(stderr,
1157 "Resuming fetch of pack %s at byte %ld\n",
1158 sha1_to_hex(target->sha1), prev_posn);
1159 sprintf(range, "Range: bytes=%ld-", prev_posn);
1160 preq->range_header = curl_slist_append(NULL, range);
1161 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1162 preq->range_header);
1163 }
1164
1165 return preq;
1166
1167 abort:
1168 free(preq->url);
1169 free(preq);
1170 return NULL;
1171 }
1172
1173 /* Helpers for fetching objects (loose) */
1174 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1175 void *data)
1176 {
1177 unsigned char expn[4096];
1178 size_t size = eltsize * nmemb;
1179 int posn = 0;
1180 struct http_object_request *freq =
1181 (struct http_object_request *)data;
1182 do {
1183 ssize_t retval = xwrite(freq->localfile,
1184 (char *) ptr + posn, size - posn);
1185 if (retval < 0)
1186 return posn;
1187 posn += retval;
1188 } while (posn < size);
1189
1190 freq->stream.avail_in = size;
1191 freq->stream.next_in = (void *)ptr;
1192 do {
1193 freq->stream.next_out = expn;
1194 freq->stream.avail_out = sizeof(expn);
1195 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1196 git_SHA1_Update(&freq->c, expn,
1197 sizeof(expn) - freq->stream.avail_out);
1198 } while (freq->stream.avail_in && freq->zret == Z_OK);
1199 data_received++;
1200 return size;
1201 }
1202
1203 struct http_object_request *new_http_object_request(const char *base_url,
1204 unsigned char *sha1)
1205 {
1206 char *hex = sha1_to_hex(sha1);
1207 char *filename;
1208 char prevfile[PATH_MAX];
1209 int prevlocal;
1210 char prev_buf[PREV_BUF_SIZE];
1211 ssize_t prev_read = 0;
1212 long prev_posn = 0;
1213 char range[RANGE_HEADER_SIZE];
1214 struct curl_slist *range_header = NULL;
1215 struct http_object_request *freq;
1216
1217 freq = xcalloc(1, sizeof(*freq));
1218 hashcpy(freq->sha1, sha1);
1219 freq->localfile = -1;
1220
1221 filename = sha1_file_name(sha1);
1222 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1223 "%s.temp", filename);
1224
1225 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1226 unlink_or_warn(prevfile);
1227 rename(freq->tmpfile, prevfile);
1228 unlink_or_warn(freq->tmpfile);
1229
1230 if (freq->localfile != -1)
1231 error("fd leakage in start: %d", freq->localfile);
1232 freq->localfile = open(freq->tmpfile,
1233 O_WRONLY | O_CREAT | O_EXCL, 0666);
1234 /*
1235 * This could have failed due to the "lazy directory creation";
1236 * try to mkdir the last path component.
1237 */
1238 if (freq->localfile < 0 && errno == ENOENT) {
1239 char *dir = strrchr(freq->tmpfile, '/');
1240 if (dir) {
1241 *dir = 0;
1242 mkdir(freq->tmpfile, 0777);
1243 *dir = '/';
1244 }
1245 freq->localfile = open(freq->tmpfile,
1246 O_WRONLY | O_CREAT | O_EXCL, 0666);
1247 }
1248
1249 if (freq->localfile < 0) {
1250 error("Couldn't create temporary file %s: %s",
1251 freq->tmpfile, strerror(errno));
1252 goto abort;
1253 }
1254
1255 git_inflate_init(&freq->stream);
1256
1257 git_SHA1_Init(&freq->c);
1258
1259 freq->url = get_remote_object_url(base_url, hex, 0);
1260
1261 /*
1262 * If a previous temp file is present, process what was already
1263 * fetched.
1264 */
1265 prevlocal = open(prevfile, O_RDONLY);
1266 if (prevlocal != -1) {
1267 do {
1268 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1269 if (prev_read>0) {
1270 if (fwrite_sha1_file(prev_buf,
1271 1,
1272 prev_read,
1273 freq) == prev_read) {
1274 prev_posn += prev_read;
1275 } else {
1276 prev_read = -1;
1277 }
1278 }
1279 } while (prev_read > 0);
1280 close(prevlocal);
1281 }
1282 unlink_or_warn(prevfile);
1283
1284 /*
1285 * Reset inflate/SHA1 if there was an error reading the previous temp
1286 * file; also rewind to the beginning of the local file.
1287 */
1288 if (prev_read == -1) {
1289 memset(&freq->stream, 0, sizeof(freq->stream));
1290 git_inflate_init(&freq->stream);
1291 git_SHA1_Init(&freq->c);
1292 if (prev_posn>0) {
1293 prev_posn = 0;
1294 lseek(freq->localfile, 0, SEEK_SET);
1295 if (ftruncate(freq->localfile, 0) < 0) {
1296 error("Couldn't truncate temporary file %s: %s",
1297 freq->tmpfile, strerror(errno));
1298 goto abort;
1299 }
1300 }
1301 }
1302
1303 freq->slot = get_active_slot();
1304
1305 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1306 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1307 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1308 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1309 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1310
1311 /*
1312 * If we have successfully processed data from a previous fetch
1313 * attempt, only fetch the data we don't already have.
1314 */
1315 if (prev_posn>0) {
1316 if (http_is_verbose)
1317 fprintf(stderr,
1318 "Resuming fetch of object %s at byte %ld\n",
1319 hex, prev_posn);
1320 sprintf(range, "Range: bytes=%ld-", prev_posn);
1321 range_header = curl_slist_append(range_header, range);
1322 curl_easy_setopt(freq->slot->curl,
1323 CURLOPT_HTTPHEADER, range_header);
1324 }
1325
1326 return freq;
1327
1328 abort:
1329 free(freq->url);
1330 free(freq);
1331 return NULL;
1332 }
1333
1334 void process_http_object_request(struct http_object_request *freq)
1335 {
1336 if (freq->slot == NULL)
1337 return;
1338 freq->curl_result = freq->slot->curl_result;
1339 freq->http_code = freq->slot->http_code;
1340 freq->slot = NULL;
1341 }
1342
1343 int finish_http_object_request(struct http_object_request *freq)
1344 {
1345 struct stat st;
1346
1347 close(freq->localfile);
1348 freq->localfile = -1;
1349
1350 process_http_object_request(freq);
1351
1352 if (freq->http_code == 416) {
1353 warning("requested range invalid; we may already have all the data.");
1354 } else if (freq->curl_result != CURLE_OK) {
1355 if (stat(freq->tmpfile, &st) == 0)
1356 if (st.st_size == 0)
1357 unlink_or_warn(freq->tmpfile);
1358 return -1;
1359 }
1360
1361 git_inflate_end(&freq->stream);
1362 git_SHA1_Final(freq->real_sha1, &freq->c);
1363 if (freq->zret != Z_STREAM_END) {
1364 unlink_or_warn(freq->tmpfile);
1365 return -1;
1366 }
1367 if (hashcmp(freq->sha1, freq->real_sha1)) {
1368 unlink_or_warn(freq->tmpfile);
1369 return -1;
1370 }
1371 freq->rename =
1372 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1373
1374 return freq->rename;
1375 }
1376
1377 void abort_http_object_request(struct http_object_request *freq)
1378 {
1379 unlink_or_warn(freq->tmpfile);
1380
1381 release_http_object_request(freq);
1382 }
1383
1384 void release_http_object_request(struct http_object_request *freq)
1385 {
1386 if (freq->localfile != -1) {
1387 close(freq->localfile);
1388 freq->localfile = -1;
1389 }
1390 if (freq->url != NULL) {
1391 free(freq->url);
1392 freq->url = NULL;
1393 }
1394 if (freq->slot != NULL) {
1395 freq->slot->callback_func = NULL;
1396 freq->slot->callback_data = NULL;
1397 release_active_slot(freq->slot);
1398 freq->slot = NULL;
1399 }
1400 }
git with Jakub Narębski modifications