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submodules: refactor computation of relative gitdir path
[git/jrn.git] / http.c
bloba4bc770e2d6196958ec5b795ca89be24be182a34
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, *description;
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 char *git_getpass_with_description(const char *what, const char *desc)
143 {
144 struct strbuf prompt = STRBUF_INIT;
145 char *r;
146
147 if (desc)
148 strbuf_addf(&prompt, "%s for '%s': ", what, desc);
149 else
150 strbuf_addf(&prompt, "%s: ", what);
151 /*
152 * NEEDSWORK: for usernames, we should do something less magical that
153 * actually echoes the characters. However, we need to read from
154 * /dev/tty and not stdio, which is not portable (but getpass will do
155 * it for us). http.c uses the same workaround.
156 */
157 r = git_getpass(prompt.buf);
158
159 strbuf_release(&prompt);
160 return xstrdup(r);
161 }
162
163 static int http_options(const char *var, const char *value, void *cb)
164 {
165 if (!strcmp("http.sslverify", var)) {
166 curl_ssl_verify = git_config_bool(var, value);
167 return 0;
168 }
169 if (!strcmp("http.sslcert", var))
170 return git_config_string(&ssl_cert, var, value);
171 #if LIBCURL_VERSION_NUM >= 0x070903
172 if (!strcmp("http.sslkey", var))
173 return git_config_string(&ssl_key, var, value);
174 #endif
175 #if LIBCURL_VERSION_NUM >= 0x070908
176 if (!strcmp("http.sslcapath", var))
177 return git_config_string(&ssl_capath, var, value);
178 #endif
179 if (!strcmp("http.sslcainfo", var))
180 return git_config_string(&ssl_cainfo, var, value);
181 if (!strcmp("http.sslcertpasswordprotected", var)) {
182 if (git_config_bool(var, value))
183 ssl_cert_password_required = 1;
184 return 0;
185 }
186 if (!strcmp("http.minsessions", var)) {
187 min_curl_sessions = git_config_int(var, value);
188 #ifndef USE_CURL_MULTI
189 if (min_curl_sessions > 1)
190 min_curl_sessions = 1;
191 #endif
192 return 0;
193 }
194 #ifdef USE_CURL_MULTI
195 if (!strcmp("http.maxrequests", var)) {
196 max_requests = git_config_int(var, value);
197 return 0;
198 }
199 #endif
200 if (!strcmp("http.lowspeedlimit", var)) {
201 curl_low_speed_limit = (long)git_config_int(var, value);
202 return 0;
203 }
204 if (!strcmp("http.lowspeedtime", var)) {
205 curl_low_speed_time = (long)git_config_int(var, value);
206 return 0;
207 }
208
209 if (!strcmp("http.noepsv", var)) {
210 curl_ftp_no_epsv = git_config_bool(var, value);
211 return 0;
212 }
213 if (!strcmp("http.proxy", var))
214 return git_config_string(&curl_http_proxy, var, value);
215
216 if (!strcmp("http.cookiefile", var))
217 return git_config_string(&curl_cookie_file, var, value);
218
219 if (!strcmp("http.postbuffer", var)) {
220 http_post_buffer = git_config_int(var, value);
221 if (http_post_buffer < LARGE_PACKET_MAX)
222 http_post_buffer = LARGE_PACKET_MAX;
223 return 0;
224 }
225
226 if (!strcmp("http.useragent", var))
227 return git_config_string(&user_agent, var, value);
228
229 /* Fall back on the default ones */
230 return git_default_config(var, value, cb);
231 }
232
233 static void init_curl_http_auth(CURL *result)
234 {
235 if (user_name) {
236 struct strbuf up = STRBUF_INIT;
237 if (!user_pass)
238 user_pass = xstrdup(git_getpass_with_description("Password", description));
239 strbuf_addf(&up, "%s:%s", user_name, user_pass);
240 curl_easy_setopt(result, CURLOPT_USERPWD,
241 strbuf_detach(&up, NULL));
242 }
243 }
244
245 static int has_cert_password(void)
246 {
247 if (ssl_cert_password != NULL)
248 return 1;
249 if (ssl_cert == NULL || ssl_cert_password_required != 1)
250 return 0;
251 /* Only prompt the user once. */
252 ssl_cert_password_required = -1;
253 ssl_cert_password = git_getpass_with_description("Certificate Password", description);
254 if (ssl_cert_password != NULL) {
255 ssl_cert_password = xstrdup(ssl_cert_password);
256 return 1;
257 } else
258 return 0;
259 }
260
261 static CURL *get_curl_handle(void)
262 {
263 CURL *result = curl_easy_init();
264
265 if (!curl_ssl_verify) {
266 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
267 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
268 } else {
269 /* Verify authenticity of the peer's certificate */
270 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
271 /* The name in the cert must match whom we tried to connect */
272 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
273 }
274
275 #if LIBCURL_VERSION_NUM >= 0x070907
276 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
277 #endif
278 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
279 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
280 #endif
281
282 init_curl_http_auth(result);
283
284 if (ssl_cert != NULL)
285 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
286 if (has_cert_password())
287 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
288 #if LIBCURL_VERSION_NUM >= 0x070903
289 if (ssl_key != NULL)
290 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
291 #endif
292 #if LIBCURL_VERSION_NUM >= 0x070908
293 if (ssl_capath != NULL)
294 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
295 #endif
296 if (ssl_cainfo != NULL)
297 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
298 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
299
300 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
301 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
302 curl_low_speed_limit);
303 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
304 curl_low_speed_time);
305 }
306
307 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
308 #if LIBCURL_VERSION_NUM >= 0x071301
309 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
310 #elif LIBCURL_VERSION_NUM >= 0x071101
311 curl_easy_setopt(result, CURLOPT_POST301, 1);
312 #endif
313
314 if (getenv("GIT_CURL_VERBOSE"))
315 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
316
317 curl_easy_setopt(result, CURLOPT_USERAGENT,
318 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
319
320 if (curl_ftp_no_epsv)
321 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
322
323 if (curl_http_proxy)
324 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
325
326 return result;
327 }
328
329 static void http_auth_init(const char *url)
330 {
331 const char *at, *colon, *cp, *slash, *host;
332
333 cp = strstr(url, "://");
334 if (!cp)
335 return;
336
337 /*
338 * Ok, the URL looks like "proto://something". Which one?
339 * "proto://<user>:<pass>@<host>/...",
340 * "proto://<user>@<host>/...", or just
341 * "proto://<host>/..."?
342 */
343 cp += 3;
344 at = strchr(cp, '@');
345 colon = strchr(cp, ':');
346 slash = strchrnul(cp, '/');
347 if (!at || slash <= at) {
348 /* No credentials, but we may have to ask for some later */
349 host = cp;
350 }
351 else if (!colon || at <= colon) {
352 /* Only username */
353 user_name = url_decode_mem(cp, at - cp);
354 user_pass = NULL;
355 host = at + 1;
356 } else {
357 user_name = url_decode_mem(cp, colon - cp);
358 user_pass = url_decode_mem(colon + 1, at - (colon + 1));
359 host = at + 1;
360 }
361
362 description = url_decode_mem(host, slash - host);
363 }
364
365 static void set_from_env(const char **var, const char *envname)
366 {
367 const char *val = getenv(envname);
368 if (val)
369 *var = val;
370 }
371
372 void http_init(struct remote *remote, const char *url)
373 {
374 char *low_speed_limit;
375 char *low_speed_time;
376
377 http_is_verbose = 0;
378
379 git_config(http_options, NULL);
380
381 curl_global_init(CURL_GLOBAL_ALL);
382
383 if (remote && remote->http_proxy)
384 curl_http_proxy = xstrdup(remote->http_proxy);
385
386 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
387 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
388
389 #ifdef USE_CURL_MULTI
390 {
391 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
392 if (http_max_requests != NULL)
393 max_requests = atoi(http_max_requests);
394 }
395
396 curlm = curl_multi_init();
397 if (curlm == NULL) {
398 fprintf(stderr, "Error creating curl multi handle.\n");
399 exit(1);
400 }
401 #endif
402
403 if (getenv("GIT_SSL_NO_VERIFY"))
404 curl_ssl_verify = 0;
405
406 set_from_env(&ssl_cert, "GIT_SSL_CERT");
407 #if LIBCURL_VERSION_NUM >= 0x070903
408 set_from_env(&ssl_key, "GIT_SSL_KEY");
409 #endif
410 #if LIBCURL_VERSION_NUM >= 0x070908
411 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
412 #endif
413 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
414
415 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
416
417 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
418 if (low_speed_limit != NULL)
419 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
420 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
421 if (low_speed_time != NULL)
422 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
423
424 if (curl_ssl_verify == -1)
425 curl_ssl_verify = 1;
426
427 curl_session_count = 0;
428 #ifdef USE_CURL_MULTI
429 if (max_requests < 1)
430 max_requests = DEFAULT_MAX_REQUESTS;
431 #endif
432
433 if (getenv("GIT_CURL_FTP_NO_EPSV"))
434 curl_ftp_no_epsv = 1;
435
436 if (url) {
437 http_auth_init(url);
438 if (!ssl_cert_password_required &&
439 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
440 !prefixcmp(url, "https://"))
441 ssl_cert_password_required = 1;
442 }
443
444 #ifndef NO_CURL_EASY_DUPHANDLE
445 curl_default = get_curl_handle();
446 #endif
447 }
448
449 void http_cleanup(void)
450 {
451 struct active_request_slot *slot = active_queue_head;
452
453 while (slot != NULL) {
454 struct active_request_slot *next = slot->next;
455 if (slot->curl != NULL) {
456 #ifdef USE_CURL_MULTI
457 curl_multi_remove_handle(curlm, slot->curl);
458 #endif
459 curl_easy_cleanup(slot->curl);
460 }
461 free(slot);
462 slot = next;
463 }
464 active_queue_head = NULL;
465
466 #ifndef NO_CURL_EASY_DUPHANDLE
467 curl_easy_cleanup(curl_default);
468 #endif
469
470 #ifdef USE_CURL_MULTI
471 curl_multi_cleanup(curlm);
472 #endif
473 curl_global_cleanup();
474
475 curl_slist_free_all(pragma_header);
476 pragma_header = NULL;
477
478 curl_slist_free_all(no_pragma_header);
479 no_pragma_header = NULL;
480
481 if (curl_http_proxy) {
482 free((void *)curl_http_proxy);
483 curl_http_proxy = NULL;
484 }
485
486 if (ssl_cert_password != NULL) {
487 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
488 free(ssl_cert_password);
489 ssl_cert_password = NULL;
490 }
491 ssl_cert_password_required = 0;
492 }
493
494 struct active_request_slot *get_active_slot(void)
495 {
496 struct active_request_slot *slot = active_queue_head;
497 struct active_request_slot *newslot;
498
499 #ifdef USE_CURL_MULTI
500 int num_transfers;
501
502 /* Wait for a slot to open up if the queue is full */
503 while (active_requests >= max_requests) {
504 curl_multi_perform(curlm, &num_transfers);
505 if (num_transfers < active_requests)
506 process_curl_messages();
507 }
508 #endif
509
510 while (slot != NULL && slot->in_use)
511 slot = slot->next;
512
513 if (slot == NULL) {
514 newslot = xmalloc(sizeof(*newslot));
515 newslot->curl = NULL;
516 newslot->in_use = 0;
517 newslot->next = NULL;
518
519 slot = active_queue_head;
520 if (slot == NULL) {
521 active_queue_head = newslot;
522 } else {
523 while (slot->next != NULL)
524 slot = slot->next;
525 slot->next = newslot;
526 }
527 slot = newslot;
528 }
529
530 if (slot->curl == NULL) {
531 #ifdef NO_CURL_EASY_DUPHANDLE
532 slot->curl = get_curl_handle();
533 #else
534 slot->curl = curl_easy_duphandle(curl_default);
535 #endif
536 curl_session_count++;
537 }
538
539 active_requests++;
540 slot->in_use = 1;
541 slot->local = NULL;
542 slot->results = NULL;
543 slot->finished = NULL;
544 slot->callback_data = NULL;
545 slot->callback_func = NULL;
546 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
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_POSTFIELDS, NULL);
553 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
554 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
555
556 return slot;
557 }
558
559 int start_active_slot(struct active_request_slot *slot)
560 {
561 #ifdef USE_CURL_MULTI
562 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
563 int num_transfers;
564
565 if (curlm_result != CURLM_OK &&
566 curlm_result != CURLM_CALL_MULTI_PERFORM) {
567 active_requests--;
568 slot->in_use = 0;
569 return 0;
570 }
571
572 /*
573 * We know there must be something to do, since we just added
574 * something.
575 */
576 curl_multi_perform(curlm, &num_transfers);
577 #endif
578 return 1;
579 }
580
581 #ifdef USE_CURL_MULTI
582 struct fill_chain {
583 void *data;
584 int (*fill)(void *);
585 struct fill_chain *next;
586 };
587
588 static struct fill_chain *fill_cfg;
589
590 void add_fill_function(void *data, int (*fill)(void *))
591 {
592 struct fill_chain *new = xmalloc(sizeof(*new));
593 struct fill_chain **linkp = &fill_cfg;
594 new->data = data;
595 new->fill = fill;
596 new->next = NULL;
597 while (*linkp)
598 linkp = &(*linkp)->next;
599 *linkp = new;
600 }
601
602 void fill_active_slots(void)
603 {
604 struct active_request_slot *slot = active_queue_head;
605
606 while (active_requests < max_requests) {
607 struct fill_chain *fill;
608 for (fill = fill_cfg; fill; fill = fill->next)
609 if (fill->fill(fill->data))
610 break;
611
612 if (!fill)
613 break;
614 }
615
616 while (slot != NULL) {
617 if (!slot->in_use && slot->curl != NULL
618 && curl_session_count > min_curl_sessions) {
619 curl_easy_cleanup(slot->curl);
620 slot->curl = NULL;
621 curl_session_count--;
622 }
623 slot = slot->next;
624 }
625 }
626
627 void step_active_slots(void)
628 {
629 int num_transfers;
630 CURLMcode curlm_result;
631
632 do {
633 curlm_result = curl_multi_perform(curlm, &num_transfers);
634 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
635 if (num_transfers < active_requests) {
636 process_curl_messages();
637 fill_active_slots();
638 }
639 }
640 #endif
641
642 void run_active_slot(struct active_request_slot *slot)
643 {
644 #ifdef USE_CURL_MULTI
645 long last_pos = 0;
646 long current_pos;
647 fd_set readfds;
648 fd_set writefds;
649 fd_set excfds;
650 int max_fd;
651 struct timeval select_timeout;
652 int finished = 0;
653
654 slot->finished = &finished;
655 while (!finished) {
656 data_received = 0;
657 step_active_slots();
658
659 if (!data_received && slot->local != NULL) {
660 current_pos = ftell(slot->local);
661 if (current_pos > last_pos)
662 data_received++;
663 last_pos = current_pos;
664 }
665
666 if (slot->in_use && !data_received) {
667 max_fd = 0;
668 FD_ZERO(&readfds);
669 FD_ZERO(&writefds);
670 FD_ZERO(&excfds);
671 select_timeout.tv_sec = 0;
672 select_timeout.tv_usec = 50000;
673 select(max_fd, &readfds, &writefds,
674 &excfds, &select_timeout);
675 }
676 }
677 #else
678 while (slot->in_use) {
679 slot->curl_result = curl_easy_perform(slot->curl);
680 finish_active_slot(slot);
681 }
682 #endif
683 }
684
685 static void closedown_active_slot(struct active_request_slot *slot)
686 {
687 active_requests--;
688 slot->in_use = 0;
689 }
690
691 static void release_active_slot(struct active_request_slot *slot)
692 {
693 closedown_active_slot(slot);
694 if (slot->curl && curl_session_count > min_curl_sessions) {
695 #ifdef USE_CURL_MULTI
696 curl_multi_remove_handle(curlm, slot->curl);
697 #endif
698 curl_easy_cleanup(slot->curl);
699 slot->curl = NULL;
700 curl_session_count--;
701 }
702 #ifdef USE_CURL_MULTI
703 fill_active_slots();
704 #endif
705 }
706
707 void finish_active_slot(struct active_request_slot *slot)
708 {
709 closedown_active_slot(slot);
710 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
711
712 if (slot->finished != NULL)
713 (*slot->finished) = 1;
714
715 /* Store slot results so they can be read after the slot is reused */
716 if (slot->results != NULL) {
717 slot->results->curl_result = slot->curl_result;
718 slot->results->http_code = slot->http_code;
719 }
720
721 /* Run callback if appropriate */
722 if (slot->callback_func != NULL)
723 slot->callback_func(slot->callback_data);
724 }
725
726 void finish_all_active_slots(void)
727 {
728 struct active_request_slot *slot = active_queue_head;
729
730 while (slot != NULL)
731 if (slot->in_use) {
732 run_active_slot(slot);
733 slot = active_queue_head;
734 } else {
735 slot = slot->next;
736 }
737 }
738
739 /* Helpers for modifying and creating URLs */
740 static inline int needs_quote(int ch)
741 {
742 if (((ch >= 'A') && (ch <= 'Z'))
743 || ((ch >= 'a') && (ch <= 'z'))
744 || ((ch >= '0') && (ch <= '9'))
745 || (ch == '/')
746 || (ch == '-')
747 || (ch == '.'))
748 return 0;
749 return 1;
750 }
751
752 static inline int hex(int v)
753 {
754 if (v < 10)
755 return '0' + v;
756 else
757 return 'A' + v - 10;
758 }
759
760 static char *quote_ref_url(const char *base, const char *ref)
761 {
762 struct strbuf buf = STRBUF_INIT;
763 const char *cp;
764 int ch;
765
766 end_url_with_slash(&buf, base);
767
768 for (cp = ref; (ch = *cp) != 0; cp++)
769 if (needs_quote(ch))
770 strbuf_addf(&buf, "%%%02x", ch);
771 else
772 strbuf_addch(&buf, *cp);
773
774 return strbuf_detach(&buf, NULL);
775 }
776
777 void append_remote_object_url(struct strbuf *buf, const char *url,
778 const char *hex,
779 int only_two_digit_prefix)
780 {
781 end_url_with_slash(buf, url);
782
783 strbuf_addf(buf, "objects/%.*s/", 2, hex);
784 if (!only_two_digit_prefix)
785 strbuf_addf(buf, "%s", hex+2);
786 }
787
788 char *get_remote_object_url(const char *url, const char *hex,
789 int only_two_digit_prefix)
790 {
791 struct strbuf buf = STRBUF_INIT;
792 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
793 return strbuf_detach(&buf, NULL);
794 }
795
796 /* http_request() targets */
797 #define HTTP_REQUEST_STRBUF 0
798 #define HTTP_REQUEST_FILE 1
799
800 static int http_request(const char *url, void *result, int target, int options)
801 {
802 struct active_request_slot *slot;
803 struct slot_results results;
804 struct curl_slist *headers = NULL;
805 struct strbuf buf = STRBUF_INIT;
806 int ret;
807
808 slot = get_active_slot();
809 slot->results = &results;
810 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
811
812 if (result == NULL) {
813 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
814 } else {
815 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
816 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
817
818 if (target == HTTP_REQUEST_FILE) {
819 long posn = ftell(result);
820 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
821 fwrite);
822 if (posn > 0) {
823 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
824 headers = curl_slist_append(headers, buf.buf);
825 strbuf_reset(&buf);
826 }
827 slot->local = result;
828 } else
829 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
830 fwrite_buffer);
831 }
832
833 strbuf_addstr(&buf, "Pragma:");
834 if (options & HTTP_NO_CACHE)
835 strbuf_addstr(&buf, " no-cache");
836
837 headers = curl_slist_append(headers, buf.buf);
838
839 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
840 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
841
842 if (start_active_slot(slot)) {
843 run_active_slot(slot);
844 if (results.curl_result == CURLE_OK)
845 ret = HTTP_OK;
846 else if (missing_target(&results))
847 ret = HTTP_MISSING_TARGET;
848 else if (results.http_code == 401) {
849 if (user_name) {
850 ret = HTTP_NOAUTH;
851 } else {
852 /*
853 * git_getpass is needed here because its very likely stdin/stdout are
854 * pipes to our parent process. So we instead need to use /dev/tty,
855 * but that is non-portable. Using git_getpass() can at least be stubbed
856 * on other platforms with a different implementation if/when necessary.
857 */
858 user_name = xstrdup(git_getpass_with_description("Username", description));
859 init_curl_http_auth(slot->curl);
860 ret = HTTP_REAUTH;
861 }
862 } else {
863 if (!curl_errorstr[0])
864 strlcpy(curl_errorstr,
865 curl_easy_strerror(results.curl_result),
866 sizeof(curl_errorstr));
867 ret = HTTP_ERROR;
868 }
869 } else {
870 error("Unable to start HTTP request for %s", url);
871 ret = HTTP_START_FAILED;
872 }
873
874 slot->local = NULL;
875 curl_slist_free_all(headers);
876 strbuf_release(&buf);
877
878 return ret;
879 }
880
881 static int http_request_reauth(const char *url, void *result, int target,
882 int options)
883 {
884 int ret = http_request(url, result, target, options);
885 if (ret != HTTP_REAUTH)
886 return ret;
887 return http_request(url, result, target, options);
888 }
889
890 int http_get_strbuf(const char *url, struct strbuf *result, int options)
891 {
892 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
893 }
894
895 /*
896 * Downloads an url and stores the result in the given file.
897 *
898 * If a previous interrupted download is detected (i.e. a previous temporary
899 * file is still around) the download is resumed.
900 */
901 static int http_get_file(const char *url, const char *filename, int options)
902 {
903 int ret;
904 struct strbuf tmpfile = STRBUF_INIT;
905 FILE *result;
906
907 strbuf_addf(&tmpfile, "%s.temp", filename);
908 result = fopen(tmpfile.buf, "a");
909 if (! result) {
910 error("Unable to open local file %s", tmpfile.buf);
911 ret = HTTP_ERROR;
912 goto cleanup;
913 }
914
915 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
916 fclose(result);
917
918 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
919 ret = HTTP_ERROR;
920 cleanup:
921 strbuf_release(&tmpfile);
922 return ret;
923 }
924
925 int http_error(const char *url, int ret)
926 {
927 /* http_request has already handled HTTP_START_FAILED. */
928 if (ret != HTTP_START_FAILED)
929 error("%s while accessing %s", curl_errorstr, url);
930
931 return ret;
932 }
933
934 int http_fetch_ref(const char *base, struct ref *ref)
935 {
936 char *url;
937 struct strbuf buffer = STRBUF_INIT;
938 int ret = -1;
939
940 url = quote_ref_url(base, ref->name);
941 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
942 strbuf_rtrim(&buffer);
943 if (buffer.len == 40)
944 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
945 else if (!prefixcmp(buffer.buf, "ref: ")) {
946 ref->symref = xstrdup(buffer.buf + 5);
947 ret = 0;
948 }
949 }
950
951 strbuf_release(&buffer);
952 free(url);
953 return ret;
954 }
955
956 /* Helpers for fetching packs */
957 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
958 {
959 char *url, *tmp;
960 struct strbuf buf = STRBUF_INIT;
961
962 if (http_is_verbose)
963 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
964
965 end_url_with_slash(&buf, base_url);
966 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
967 url = strbuf_detach(&buf, NULL);
968
969 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
970 tmp = strbuf_detach(&buf, NULL);
971
972 if (http_get_file(url, tmp, 0) != HTTP_OK) {
973 error("Unable to get pack index %s\n", url);
974 free(tmp);
975 tmp = NULL;
976 }
977
978 free(url);
979 return tmp;
980 }
981
982 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
983 unsigned char *sha1, const char *base_url)
984 {
985 struct packed_git *new_pack;
986 char *tmp_idx = NULL;
987 int ret;
988
989 if (has_pack_index(sha1)) {
990 new_pack = parse_pack_index(sha1, NULL);
991 if (!new_pack)
992 return -1; /* parse_pack_index() already issued error message */
993 goto add_pack;
994 }
995
996 tmp_idx = fetch_pack_index(sha1, base_url);
997 if (!tmp_idx)
998 return -1;
999
1000 new_pack = parse_pack_index(sha1, tmp_idx);
1001 if (!new_pack) {
1002 unlink(tmp_idx);
1003 free(tmp_idx);
1004
1005 return -1; /* parse_pack_index() already issued error message */
1006 }
1007
1008 ret = verify_pack_index(new_pack);
1009 if (!ret) {
1010 close_pack_index(new_pack);
1011 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1012 }
1013 free(tmp_idx);
1014 if (ret)
1015 return -1;
1016
1017 add_pack:
1018 new_pack->next = *packs_head;
1019 *packs_head = new_pack;
1020 return 0;
1021 }
1022
1023 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1024 {
1025 int ret = 0, i = 0;
1026 char *url, *data;
1027 struct strbuf buf = STRBUF_INIT;
1028 unsigned char sha1[20];
1029
1030 end_url_with_slash(&buf, base_url);
1031 strbuf_addstr(&buf, "objects/info/packs");
1032 url = strbuf_detach(&buf, NULL);
1033
1034 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1035 if (ret != HTTP_OK)
1036 goto cleanup;
1037
1038 data = buf.buf;
1039 while (i < buf.len) {
1040 switch (data[i]) {
1041 case 'P':
1042 i++;
1043 if (i + 52 <= buf.len &&
1044 !prefixcmp(data + i, " pack-") &&
1045 !prefixcmp(data + i + 46, ".pack\n")) {
1046 get_sha1_hex(data + i + 6, sha1);
1047 fetch_and_setup_pack_index(packs_head, sha1,
1048 base_url);
1049 i += 51;
1050 break;
1051 }
1052 default:
1053 while (i < buf.len && data[i] != '\n')
1054 i++;
1055 }
1056 i++;
1057 }
1058
1059 cleanup:
1060 free(url);
1061 return ret;
1062 }
1063
1064 void release_http_pack_request(struct http_pack_request *preq)
1065 {
1066 if (preq->packfile != NULL) {
1067 fclose(preq->packfile);
1068 preq->packfile = NULL;
1069 preq->slot->local = NULL;
1070 }
1071 if (preq->range_header != NULL) {
1072 curl_slist_free_all(preq->range_header);
1073 preq->range_header = NULL;
1074 }
1075 preq->slot = NULL;
1076 free(preq->url);
1077 }
1078
1079 int finish_http_pack_request(struct http_pack_request *preq)
1080 {
1081 struct packed_git **lst;
1082 struct packed_git *p = preq->target;
1083 char *tmp_idx;
1084 struct child_process ip;
1085 const char *ip_argv[8];
1086
1087 close_pack_index(p);
1088
1089 fclose(preq->packfile);
1090 preq->packfile = NULL;
1091 preq->slot->local = NULL;
1092
1093 lst = preq->lst;
1094 while (*lst != p)
1095 lst = &((*lst)->next);
1096 *lst = (*lst)->next;
1097
1098 tmp_idx = xstrdup(preq->tmpfile);
1099 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1100 ".idx.temp");
1101
1102 ip_argv[0] = "index-pack";
1103 ip_argv[1] = "-o";
1104 ip_argv[2] = tmp_idx;
1105 ip_argv[3] = preq->tmpfile;
1106 ip_argv[4] = NULL;
1107
1108 memset(&ip, 0, sizeof(ip));
1109 ip.argv = ip_argv;
1110 ip.git_cmd = 1;
1111 ip.no_stdin = 1;
1112 ip.no_stdout = 1;
1113
1114 if (run_command(&ip)) {
1115 unlink(preq->tmpfile);
1116 unlink(tmp_idx);
1117 free(tmp_idx);
1118 return -1;
1119 }
1120
1121 unlink(sha1_pack_index_name(p->sha1));
1122
1123 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1124 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1125 free(tmp_idx);
1126 return -1;
1127 }
1128
1129 install_packed_git(p);
1130 free(tmp_idx);
1131 return 0;
1132 }
1133
1134 struct http_pack_request *new_http_pack_request(
1135 struct packed_git *target, const char *base_url)
1136 {
1137 long prev_posn = 0;
1138 char range[RANGE_HEADER_SIZE];
1139 struct strbuf buf = STRBUF_INIT;
1140 struct http_pack_request *preq;
1141
1142 preq = xcalloc(1, sizeof(*preq));
1143 preq->target = target;
1144
1145 end_url_with_slash(&buf, base_url);
1146 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1147 sha1_to_hex(target->sha1));
1148 preq->url = strbuf_detach(&buf, NULL);
1149
1150 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1151 sha1_pack_name(target->sha1));
1152 preq->packfile = fopen(preq->tmpfile, "a");
1153 if (!preq->packfile) {
1154 error("Unable to open local file %s for pack",
1155 preq->tmpfile);
1156 goto abort;
1157 }
1158
1159 preq->slot = get_active_slot();
1160 preq->slot->local = preq->packfile;
1161 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1162 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1163 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1164 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1165 no_pragma_header);
1166
1167 /*
1168 * If there is data present from a previous transfer attempt,
1169 * resume where it left off
1170 */
1171 prev_posn = ftell(preq->packfile);
1172 if (prev_posn>0) {
1173 if (http_is_verbose)
1174 fprintf(stderr,
1175 "Resuming fetch of pack %s at byte %ld\n",
1176 sha1_to_hex(target->sha1), prev_posn);
1177 sprintf(range, "Range: bytes=%ld-", prev_posn);
1178 preq->range_header = curl_slist_append(NULL, range);
1179 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1180 preq->range_header);
1181 }
1182
1183 return preq;
1184
1185 abort:
1186 free(preq->url);
1187 free(preq);
1188 return NULL;
1189 }
1190
1191 /* Helpers for fetching objects (loose) */
1192 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1193 void *data)
1194 {
1195 unsigned char expn[4096];
1196 size_t size = eltsize * nmemb;
1197 int posn = 0;
1198 struct http_object_request *freq =
1199 (struct http_object_request *)data;
1200 do {
1201 ssize_t retval = xwrite(freq->localfile,
1202 (char *) ptr + posn, size - posn);
1203 if (retval < 0)
1204 return posn;
1205 posn += retval;
1206 } while (posn < size);
1207
1208 freq->stream.avail_in = size;
1209 freq->stream.next_in = (void *)ptr;
1210 do {
1211 freq->stream.next_out = expn;
1212 freq->stream.avail_out = sizeof(expn);
1213 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1214 git_SHA1_Update(&freq->c, expn,
1215 sizeof(expn) - freq->stream.avail_out);
1216 } while (freq->stream.avail_in && freq->zret == Z_OK);
1217 data_received++;
1218 return size;
1219 }
1220
1221 struct http_object_request *new_http_object_request(const char *base_url,
1222 unsigned char *sha1)
1223 {
1224 char *hex = sha1_to_hex(sha1);
1225 char *filename;
1226 char prevfile[PATH_MAX];
1227 int prevlocal;
1228 char prev_buf[PREV_BUF_SIZE];
1229 ssize_t prev_read = 0;
1230 long prev_posn = 0;
1231 char range[RANGE_HEADER_SIZE];
1232 struct curl_slist *range_header = NULL;
1233 struct http_object_request *freq;
1234
1235 freq = xcalloc(1, sizeof(*freq));
1236 hashcpy(freq->sha1, sha1);
1237 freq->localfile = -1;
1238
1239 filename = sha1_file_name(sha1);
1240 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1241 "%s.temp", filename);
1242
1243 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1244 unlink_or_warn(prevfile);
1245 rename(freq->tmpfile, prevfile);
1246 unlink_or_warn(freq->tmpfile);
1247
1248 if (freq->localfile != -1)
1249 error("fd leakage in start: %d", freq->localfile);
1250 freq->localfile = open(freq->tmpfile,
1251 O_WRONLY | O_CREAT | O_EXCL, 0666);
1252 /*
1253 * This could have failed due to the "lazy directory creation";
1254 * try to mkdir the last path component.
1255 */
1256 if (freq->localfile < 0 && errno == ENOENT) {
1257 char *dir = strrchr(freq->tmpfile, '/');
1258 if (dir) {
1259 *dir = 0;
1260 mkdir(freq->tmpfile, 0777);
1261 *dir = '/';
1262 }
1263 freq->localfile = open(freq->tmpfile,
1264 O_WRONLY | O_CREAT | O_EXCL, 0666);
1265 }
1266
1267 if (freq->localfile < 0) {
1268 error("Couldn't create temporary file %s: %s",
1269 freq->tmpfile, strerror(errno));
1270 goto abort;
1271 }
1272
1273 git_inflate_init(&freq->stream);
1274
1275 git_SHA1_Init(&freq->c);
1276
1277 freq->url = get_remote_object_url(base_url, hex, 0);
1278
1279 /*
1280 * If a previous temp file is present, process what was already
1281 * fetched.
1282 */
1283 prevlocal = open(prevfile, O_RDONLY);
1284 if (prevlocal != -1) {
1285 do {
1286 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1287 if (prev_read>0) {
1288 if (fwrite_sha1_file(prev_buf,
1289 1,
1290 prev_read,
1291 freq) == prev_read) {
1292 prev_posn += prev_read;
1293 } else {
1294 prev_read = -1;
1295 }
1296 }
1297 } while (prev_read > 0);
1298 close(prevlocal);
1299 }
1300 unlink_or_warn(prevfile);
1301
1302 /*
1303 * Reset inflate/SHA1 if there was an error reading the previous temp
1304 * file; also rewind to the beginning of the local file.
1305 */
1306 if (prev_read == -1) {
1307 memset(&freq->stream, 0, sizeof(freq->stream));
1308 git_inflate_init(&freq->stream);
1309 git_SHA1_Init(&freq->c);
1310 if (prev_posn>0) {
1311 prev_posn = 0;
1312 lseek(freq->localfile, 0, SEEK_SET);
1313 if (ftruncate(freq->localfile, 0) < 0) {
1314 error("Couldn't truncate temporary file %s: %s",
1315 freq->tmpfile, strerror(errno));
1316 goto abort;
1317 }
1318 }
1319 }
1320
1321 freq->slot = get_active_slot();
1322
1323 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1324 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1325 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1326 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1327 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1328
1329 /*
1330 * If we have successfully processed data from a previous fetch
1331 * attempt, only fetch the data we don't already have.
1332 */
1333 if (prev_posn>0) {
1334 if (http_is_verbose)
1335 fprintf(stderr,
1336 "Resuming fetch of object %s at byte %ld\n",
1337 hex, prev_posn);
1338 sprintf(range, "Range: bytes=%ld-", prev_posn);
1339 range_header = curl_slist_append(range_header, range);
1340 curl_easy_setopt(freq->slot->curl,
1341 CURLOPT_HTTPHEADER, range_header);
1342 }
1343
1344 return freq;
1345
1346 abort:
1347 free(freq->url);
1348 free(freq);
1349 return NULL;
1350 }
1351
1352 void process_http_object_request(struct http_object_request *freq)
1353 {
1354 if (freq->slot == NULL)
1355 return;
1356 freq->curl_result = freq->slot->curl_result;
1357 freq->http_code = freq->slot->http_code;
1358 freq->slot = NULL;
1359 }
1360
1361 int finish_http_object_request(struct http_object_request *freq)
1362 {
1363 struct stat st;
1364
1365 close(freq->localfile);
1366 freq->localfile = -1;
1367
1368 process_http_object_request(freq);
1369
1370 if (freq->http_code == 416) {
1371 warning("requested range invalid; we may already have all the data.");
1372 } else if (freq->curl_result != CURLE_OK) {
1373 if (stat(freq->tmpfile, &st) == 0)
1374 if (st.st_size == 0)
1375 unlink_or_warn(freq->tmpfile);
1376 return -1;
1377 }
1378
1379 git_inflate_end(&freq->stream);
1380 git_SHA1_Final(freq->real_sha1, &freq->c);
1381 if (freq->zret != Z_STREAM_END) {
1382 unlink_or_warn(freq->tmpfile);
1383 return -1;
1384 }
1385 if (hashcmp(freq->sha1, freq->real_sha1)) {
1386 unlink_or_warn(freq->tmpfile);
1387 return -1;
1388 }
1389 freq->rename =
1390 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1391
1392 return freq->rename;
1393 }
1394
1395 void abort_http_object_request(struct http_object_request *freq)
1396 {
1397 unlink_or_warn(freq->tmpfile);
1398
1399 release_http_object_request(freq);
1400 }
1401
1402 void release_http_object_request(struct http_object_request *freq)
1403 {
1404 if (freq->localfile != -1) {
1405 close(freq->localfile);
1406 freq->localfile = -1;
1407 }
1408 if (freq->url != NULL) {
1409 free(freq->url);
1410 freq->url = NULL;
1411 }
1412 if (freq->slot != NULL) {
1413 freq->slot->callback_func = NULL;
1414 freq->slot->callback_data = NULL;
1415 release_active_slot(freq->slot);
1416 freq->slot = NULL;
1417 }
1418 }
Jonathan Nieder’s miscellaneous git branches