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Merge branch 'jc/request-pull-show-head-4' into next
[git/dscho.git] / http.c
blob548cfe128f454e1894b96b494d5bfda5f4f94313
1 #include "http.h"
2 #include "pack.h"
3 #include "sideband.h"
4 #include "run-command.h"
5 #include "url.h"
6
7 int active_requests;
8 int http_is_verbose;
9 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
10
11 #if LIBCURL_VERSION_NUM >= 0x070a06
12 #define LIBCURL_CAN_HANDLE_AUTH_ANY
13 #endif
14
15 static int min_curl_sessions = 1;
16 static int curl_session_count;
17 #ifdef USE_CURL_MULTI
18 static int max_requests = -1;
19 static CURLM *curlm;
20 #endif
21 #ifndef NO_CURL_EASY_DUPHANDLE
22 static CURL *curl_default;
23 #endif
24
25 #define PREV_BUF_SIZE 4096
26 #define RANGE_HEADER_SIZE 30
27
28 char curl_errorstr[CURL_ERROR_SIZE];
29
30 static int curl_ssl_verify = -1;
31 static const char *ssl_cert;
32 #if LIBCURL_VERSION_NUM >= 0x070903
33 static const char *ssl_key;
34 #endif
35 #if LIBCURL_VERSION_NUM >= 0x070908
36 static const char *ssl_capath;
37 #endif
38 static const char *ssl_cainfo;
39 static long curl_low_speed_limit = -1;
40 static long curl_low_speed_time = -1;
41 static int curl_ftp_no_epsv;
42 static const char *curl_http_proxy;
43 static const char *curl_cookie_file;
44 static char *user_name, *user_pass, *description;
45 static const char *user_agent;
46
47 #if LIBCURL_VERSION_NUM >= 0x071700
48 /* Use CURLOPT_KEYPASSWD as is */
49 #elif LIBCURL_VERSION_NUM >= 0x070903
50 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
51 #else
52 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
53 #endif
54
55 static char *ssl_cert_password;
56 static int ssl_cert_password_required;
57
58 static struct curl_slist *pragma_header;
59 static struct curl_slist *no_pragma_header;
60
61 static struct active_request_slot *active_queue_head;
62
63 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
64 {
65 size_t size = eltsize * nmemb;
66 struct buffer *buffer = buffer_;
67
68 if (size > buffer->buf.len - buffer->posn)
69 size = buffer->buf.len - buffer->posn;
70 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
71 buffer->posn += size;
72
73 return size;
74 }
75
76 #ifndef NO_CURL_IOCTL
77 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
78 {
79 struct buffer *buffer = clientp;
80
81 switch (cmd) {
82 case CURLIOCMD_NOP:
83 return CURLIOE_OK;
84
85 case CURLIOCMD_RESTARTREAD:
86 buffer->posn = 0;
87 return CURLIOE_OK;
88
89 default:
90 return CURLIOE_UNKNOWNCMD;
91 }
92 }
93 #endif
94
95 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
96 {
97 size_t size = eltsize * nmemb;
98 struct strbuf *buffer = buffer_;
99
100 strbuf_add(buffer, ptr, size);
101 return size;
102 }
103
104 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
105 {
106 return eltsize * nmemb;
107 }
108
109 #ifdef USE_CURL_MULTI
110 static void process_curl_messages(void)
111 {
112 int num_messages;
113 struct active_request_slot *slot;
114 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
115
116 while (curl_message != NULL) {
117 if (curl_message->msg == CURLMSG_DONE) {
118 int curl_result = curl_message->data.result;
119 slot = active_queue_head;
120 while (slot != NULL &&
121 slot->curl != curl_message->easy_handle)
122 slot = slot->next;
123 if (slot != NULL) {
124 curl_multi_remove_handle(curlm, slot->curl);
125 slot->curl_result = curl_result;
126 finish_active_slot(slot);
127 } else {
128 fprintf(stderr, "Received DONE message for unknown request!\n");
129 }
130 } else {
131 fprintf(stderr, "Unknown CURL message received: %d\n",
132 (int)curl_message->msg);
133 }
134 curl_message = curl_multi_info_read(curlm, &num_messages);
135 }
136 }
137 #endif
138
139 static char *git_getpass_with_description(const char *what, const char *desc)
140 {
141 struct strbuf prompt = STRBUF_INIT;
142 char *r;
143
144 if (desc)
145 strbuf_addf(&prompt, "%s for '%s': ", what, desc);
146 else
147 strbuf_addf(&prompt, "%s: ", what);
148 /*
149 * NEEDSWORK: for usernames, we should do something less magical that
150 * actually echoes the characters. However, we need to read from
151 * /dev/tty and not stdio, which is not portable (but getpass will do
152 * it for us). http.c uses the same workaround.
153 */
154 r = git_getpass(prompt.buf);
155
156 strbuf_release(&prompt);
157 return xstrdup(r);
158 }
159
160 static int http_options(const char *var, const char *value, void *cb)
161 {
162 if (!strcmp("http.sslverify", var)) {
163 curl_ssl_verify = git_config_bool(var, value);
164 return 0;
165 }
166 if (!strcmp("http.sslcert", var))
167 return git_config_string(&ssl_cert, var, value);
168 #if LIBCURL_VERSION_NUM >= 0x070903
169 if (!strcmp("http.sslkey", var))
170 return git_config_string(&ssl_key, var, value);
171 #endif
172 #if LIBCURL_VERSION_NUM >= 0x070908
173 if (!strcmp("http.sslcapath", var))
174 return git_config_string(&ssl_capath, var, value);
175 #endif
176 if (!strcmp("http.sslcainfo", var))
177 return git_config_string(&ssl_cainfo, var, value);
178 if (!strcmp("http.sslcertpasswordprotected", var)) {
179 if (git_config_bool(var, value))
180 ssl_cert_password_required = 1;
181 return 0;
182 }
183 if (!strcmp("http.minsessions", var)) {
184 min_curl_sessions = git_config_int(var, value);
185 #ifndef USE_CURL_MULTI
186 if (min_curl_sessions > 1)
187 min_curl_sessions = 1;
188 #endif
189 return 0;
190 }
191 #ifdef USE_CURL_MULTI
192 if (!strcmp("http.maxrequests", var)) {
193 max_requests = git_config_int(var, value);
194 return 0;
195 }
196 #endif
197 if (!strcmp("http.lowspeedlimit", var)) {
198 curl_low_speed_limit = (long)git_config_int(var, value);
199 return 0;
200 }
201 if (!strcmp("http.lowspeedtime", var)) {
202 curl_low_speed_time = (long)git_config_int(var, value);
203 return 0;
204 }
205
206 if (!strcmp("http.noepsv", var)) {
207 curl_ftp_no_epsv = git_config_bool(var, value);
208 return 0;
209 }
210 if (!strcmp("http.proxy", var))
211 return git_config_string(&curl_http_proxy, var, value);
212
213 if (!strcmp("http.cookiefile", var))
214 return git_config_string(&curl_cookie_file, var, value);
215
216 if (!strcmp("http.postbuffer", var)) {
217 http_post_buffer = git_config_int(var, value);
218 if (http_post_buffer < LARGE_PACKET_MAX)
219 http_post_buffer = LARGE_PACKET_MAX;
220 return 0;
221 }
222
223 if (!strcmp("http.useragent", var))
224 return git_config_string(&user_agent, var, value);
225
226 /* Fall back on the default ones */
227 return git_default_config(var, value, cb);
228 }
229
230 static void init_curl_http_auth(CURL *result)
231 {
232 if (user_name) {
233 struct strbuf up = STRBUF_INIT;
234 if (!user_pass)
235 user_pass = xstrdup(git_getpass_with_description("Password", description));
236 strbuf_addf(&up, "%s:%s", user_name, user_pass);
237 curl_easy_setopt(result, CURLOPT_USERPWD,
238 strbuf_detach(&up, NULL));
239 }
240 }
241
242 static int has_cert_password(void)
243 {
244 if (ssl_cert_password != NULL)
245 return 1;
246 if (ssl_cert == NULL || ssl_cert_password_required != 1)
247 return 0;
248 /* Only prompt the user once. */
249 ssl_cert_password_required = -1;
250 ssl_cert_password = git_getpass_with_description("Certificate Password", description);
251 if (ssl_cert_password != NULL) {
252 ssl_cert_password = xstrdup(ssl_cert_password);
253 return 1;
254 } else
255 return 0;
256 }
257
258 static CURL *get_curl_handle(void)
259 {
260 CURL *result = curl_easy_init();
261
262 if (!curl_ssl_verify) {
263 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
264 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
265 } else {
266 /* Verify authenticity of the peer's certificate */
267 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
268 /* The name in the cert must match whom we tried to connect */
269 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
270 }
271
272 #if LIBCURL_VERSION_NUM >= 0x070907
273 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
274 #endif
275 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
276 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
277 #endif
278
279 if (ssl_cert != NULL)
280 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
281 if (has_cert_password())
282 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
283 #if LIBCURL_VERSION_NUM >= 0x070903
284 if (ssl_key != NULL)
285 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
286 #endif
287 #if LIBCURL_VERSION_NUM >= 0x070908
288 if (ssl_capath != NULL)
289 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
290 #endif
291 if (ssl_cainfo != NULL)
292 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
293 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
294
295 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
296 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
297 curl_low_speed_limit);
298 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
299 curl_low_speed_time);
300 }
301
302 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
303 #if LIBCURL_VERSION_NUM >= 0x071301
304 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
305 #elif LIBCURL_VERSION_NUM >= 0x071101
306 curl_easy_setopt(result, CURLOPT_POST301, 1);
307 #endif
308
309 if (getenv("GIT_CURL_VERBOSE"))
310 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
311
312 curl_easy_setopt(result, CURLOPT_USERAGENT,
313 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
314
315 if (curl_ftp_no_epsv)
316 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
317
318 if (curl_http_proxy)
319 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
320
321 return result;
322 }
323
324 static void http_auth_init(const char *url)
325 {
326 const char *at, *colon, *cp, *slash, *host;
327
328 cp = strstr(url, "://");
329 if (!cp)
330 return;
331
332 /*
333 * Ok, the URL looks like "proto://something". Which one?
334 * "proto://<user>:<pass>@<host>/...",
335 * "proto://<user>@<host>/...", or just
336 * "proto://<host>/..."?
337 */
338 cp += 3;
339 at = strchr(cp, '@');
340 colon = strchr(cp, ':');
341 slash = strchrnul(cp, '/');
342 if (!at || slash <= at) {
343 /* No credentials, but we may have to ask for some later */
344 host = cp;
345 }
346 else if (!colon || at <= colon) {
347 /* Only username */
348 user_name = url_decode_mem(cp, at - cp);
349 user_pass = NULL;
350 host = at + 1;
351 } else {
352 user_name = url_decode_mem(cp, colon - cp);
353 user_pass = url_decode_mem(colon + 1, at - (colon + 1));
354 host = at + 1;
355 }
356
357 description = url_decode_mem(host, slash - host);
358 }
359
360 static void set_from_env(const char **var, const char *envname)
361 {
362 const char *val = getenv(envname);
363 if (val)
364 *var = val;
365 }
366
367 void http_init(struct remote *remote, const char *url)
368 {
369 char *low_speed_limit;
370 char *low_speed_time;
371
372 http_is_verbose = 0;
373
374 git_config(http_options, NULL);
375
376 curl_global_init(CURL_GLOBAL_ALL);
377
378 if (remote && remote->http_proxy)
379 curl_http_proxy = xstrdup(remote->http_proxy);
380
381 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
382 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
383
384 #ifdef USE_CURL_MULTI
385 {
386 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
387 if (http_max_requests != NULL)
388 max_requests = atoi(http_max_requests);
389 }
390
391 curlm = curl_multi_init();
392 if (curlm == NULL) {
393 fprintf(stderr, "Error creating curl multi handle.\n");
394 exit(1);
395 }
396 #endif
397
398 if (getenv("GIT_SSL_NO_VERIFY"))
399 curl_ssl_verify = 0;
400
401 set_from_env(&ssl_cert, "GIT_SSL_CERT");
402 #if LIBCURL_VERSION_NUM >= 0x070903
403 set_from_env(&ssl_key, "GIT_SSL_KEY");
404 #endif
405 #if LIBCURL_VERSION_NUM >= 0x070908
406 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
407 #endif
408 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
409
410 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
411
412 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
413 if (low_speed_limit != NULL)
414 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
415 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
416 if (low_speed_time != NULL)
417 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
418
419 if (curl_ssl_verify == -1)
420 curl_ssl_verify = 1;
421
422 curl_session_count = 0;
423 #ifdef USE_CURL_MULTI
424 if (max_requests < 1)
425 max_requests = DEFAULT_MAX_REQUESTS;
426 #endif
427
428 if (getenv("GIT_CURL_FTP_NO_EPSV"))
429 curl_ftp_no_epsv = 1;
430
431 if (url) {
432 http_auth_init(url);
433 if (!ssl_cert_password_required &&
434 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
435 !prefixcmp(url, "https://"))
436 ssl_cert_password_required = 1;
437 }
438
439 #ifndef NO_CURL_EASY_DUPHANDLE
440 curl_default = get_curl_handle();
441 #endif
442 }
443
444 void http_cleanup(void)
445 {
446 struct active_request_slot *slot = active_queue_head;
447
448 while (slot != NULL) {
449 struct active_request_slot *next = slot->next;
450 if (slot->curl != NULL) {
451 #ifdef USE_CURL_MULTI
452 curl_multi_remove_handle(curlm, slot->curl);
453 #endif
454 curl_easy_cleanup(slot->curl);
455 }
456 free(slot);
457 slot = next;
458 }
459 active_queue_head = NULL;
460
461 #ifndef NO_CURL_EASY_DUPHANDLE
462 curl_easy_cleanup(curl_default);
463 #endif
464
465 #ifdef USE_CURL_MULTI
466 curl_multi_cleanup(curlm);
467 #endif
468 curl_global_cleanup();
469
470 curl_slist_free_all(pragma_header);
471 pragma_header = NULL;
472
473 curl_slist_free_all(no_pragma_header);
474 no_pragma_header = NULL;
475
476 if (curl_http_proxy) {
477 free((void *)curl_http_proxy);
478 curl_http_proxy = NULL;
479 }
480
481 if (ssl_cert_password != NULL) {
482 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
483 free(ssl_cert_password);
484 ssl_cert_password = NULL;
485 }
486 ssl_cert_password_required = 0;
487 }
488
489 struct active_request_slot *get_active_slot(void)
490 {
491 struct active_request_slot *slot = active_queue_head;
492 struct active_request_slot *newslot;
493
494 #ifdef USE_CURL_MULTI
495 int num_transfers;
496
497 /* Wait for a slot to open up if the queue is full */
498 while (active_requests >= max_requests) {
499 curl_multi_perform(curlm, &num_transfers);
500 if (num_transfers < active_requests)
501 process_curl_messages();
502 }
503 #endif
504
505 while (slot != NULL && slot->in_use)
506 slot = slot->next;
507
508 if (slot == NULL) {
509 newslot = xmalloc(sizeof(*newslot));
510 newslot->curl = NULL;
511 newslot->in_use = 0;
512 newslot->next = NULL;
513
514 slot = active_queue_head;
515 if (slot == NULL) {
516 active_queue_head = newslot;
517 } else {
518 while (slot->next != NULL)
519 slot = slot->next;
520 slot->next = newslot;
521 }
522 slot = newslot;
523 }
524
525 if (slot->curl == NULL) {
526 #ifdef NO_CURL_EASY_DUPHANDLE
527 slot->curl = get_curl_handle();
528 #else
529 slot->curl = curl_easy_duphandle(curl_default);
530 #endif
531 curl_session_count++;
532 }
533
534 active_requests++;
535 slot->in_use = 1;
536 slot->results = NULL;
537 slot->finished = NULL;
538 slot->callback_data = NULL;
539 slot->callback_func = NULL;
540 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
541 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
542 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
543 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
544 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
545 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
546 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
547 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
548 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
549
550 return slot;
551 }
552
553 int start_active_slot(struct active_request_slot *slot)
554 {
555 #ifdef USE_CURL_MULTI
556 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
557 int num_transfers;
558
559 if (curlm_result != CURLM_OK &&
560 curlm_result != CURLM_CALL_MULTI_PERFORM) {
561 active_requests--;
562 slot->in_use = 0;
563 return 0;
564 }
565
566 /*
567 * We know there must be something to do, since we just added
568 * something.
569 */
570 curl_multi_perform(curlm, &num_transfers);
571 #endif
572 return 1;
573 }
574
575 #ifdef USE_CURL_MULTI
576 struct fill_chain {
577 void *data;
578 int (*fill)(void *);
579 struct fill_chain *next;
580 };
581
582 static struct fill_chain *fill_cfg;
583
584 void add_fill_function(void *data, int (*fill)(void *))
585 {
586 struct fill_chain *new = xmalloc(sizeof(*new));
587 struct fill_chain **linkp = &fill_cfg;
588 new->data = data;
589 new->fill = fill;
590 new->next = NULL;
591 while (*linkp)
592 linkp = &(*linkp)->next;
593 *linkp = new;
594 }
595
596 void fill_active_slots(void)
597 {
598 struct active_request_slot *slot = active_queue_head;
599
600 while (active_requests < max_requests) {
601 struct fill_chain *fill;
602 for (fill = fill_cfg; fill; fill = fill->next)
603 if (fill->fill(fill->data))
604 break;
605
606 if (!fill)
607 break;
608 }
609
610 while (slot != NULL) {
611 if (!slot->in_use && slot->curl != NULL
612 && curl_session_count > min_curl_sessions) {
613 curl_easy_cleanup(slot->curl);
614 slot->curl = NULL;
615 curl_session_count--;
616 }
617 slot = slot->next;
618 }
619 }
620
621 void step_active_slots(void)
622 {
623 int num_transfers;
624 CURLMcode curlm_result;
625
626 do {
627 curlm_result = curl_multi_perform(curlm, &num_transfers);
628 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
629 if (num_transfers < active_requests) {
630 process_curl_messages();
631 fill_active_slots();
632 }
633 }
634 #endif
635
636 void run_active_slot(struct active_request_slot *slot)
637 {
638 #ifdef USE_CURL_MULTI
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 step_active_slots();
649
650 if (slot->in_use) {
651 #if LIBCURL_VERSION_NUM >= 0x070f04
652 long curl_timeout;
653 curl_multi_timeout(curlm, &curl_timeout);
654 if (curl_timeout == 0) {
655 continue;
656 } else if (curl_timeout == -1) {
657 select_timeout.tv_sec = 0;
658 select_timeout.tv_usec = 50000;
659 } else {
660 select_timeout.tv_sec = curl_timeout / 1000;
661 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
662 }
663 #else
664 select_timeout.tv_sec = 0;
665 select_timeout.tv_usec = 50000;
666 #endif
667
668 max_fd = -1;
669 FD_ZERO(&readfds);
670 FD_ZERO(&writefds);
671 FD_ZERO(&excfds);
672 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
673
674 select(max_fd+1, &readfds, &writefds, &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 } 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 && user_pass) {
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 if (!user_name)
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 curl_slist_free_all(headers);
875 strbuf_release(&buf);
876
877 return ret;
878 }
879
880 static int http_request_reauth(const char *url, void *result, int target,
881 int options)
882 {
883 int ret = http_request(url, result, target, options);
884 if (ret != HTTP_REAUTH)
885 return ret;
886 return http_request(url, result, target, options);
887 }
888
889 int http_get_strbuf(const char *url, struct strbuf *result, int options)
890 {
891 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
892 }
893
894 /*
895 * Downloads an url and stores the result in the given file.
896 *
897 * If a previous interrupted download is detected (i.e. a previous temporary
898 * file is still around) the download is resumed.
899 */
900 static int http_get_file(const char *url, const char *filename, int options)
901 {
902 int ret;
903 struct strbuf tmpfile = STRBUF_INIT;
904 FILE *result;
905
906 strbuf_addf(&tmpfile, "%s.temp", filename);
907 result = fopen(tmpfile.buf, "a");
908 if (! result) {
909 error("Unable to open local file %s", tmpfile.buf);
910 ret = HTTP_ERROR;
911 goto cleanup;
912 }
913
914 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
915 fclose(result);
916
917 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
918 ret = HTTP_ERROR;
919 cleanup:
920 strbuf_release(&tmpfile);
921 return ret;
922 }
923
924 int http_error(const char *url, int ret)
925 {
926 /* http_request has already handled HTTP_START_FAILED. */
927 if (ret != HTTP_START_FAILED)
928 error("%s while accessing %s", curl_errorstr, url);
929
930 return ret;
931 }
932
933 int http_fetch_ref(const char *base, struct ref *ref)
934 {
935 char *url;
936 struct strbuf buffer = STRBUF_INIT;
937 int ret = -1;
938
939 url = quote_ref_url(base, ref->name);
940 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
941 strbuf_rtrim(&buffer);
942 if (buffer.len == 40)
943 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
944 else if (!prefixcmp(buffer.buf, "ref: ")) {
945 ref->symref = xstrdup(buffer.buf + 5);
946 ret = 0;
947 }
948 }
949
950 strbuf_release(&buffer);
951 free(url);
952 return ret;
953 }
954
955 /* Helpers for fetching packs */
956 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
957 {
958 char *url, *tmp;
959 struct strbuf buf = STRBUF_INIT;
960
961 if (http_is_verbose)
962 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
963
964 end_url_with_slash(&buf, base_url);
965 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
966 url = strbuf_detach(&buf, NULL);
967
968 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
969 tmp = strbuf_detach(&buf, NULL);
970
971 if (http_get_file(url, tmp, 0) != HTTP_OK) {
972 error("Unable to get pack index %s\n", url);
973 free(tmp);
974 tmp = NULL;
975 }
976
977 free(url);
978 return tmp;
979 }
980
981 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
982 unsigned char *sha1, const char *base_url)
983 {
984 struct packed_git *new_pack;
985 char *tmp_idx = NULL;
986 int ret;
987
988 if (has_pack_index(sha1)) {
989 new_pack = parse_pack_index(sha1, NULL);
990 if (!new_pack)
991 return -1; /* parse_pack_index() already issued error message */
992 goto add_pack;
993 }
994
995 tmp_idx = fetch_pack_index(sha1, base_url);
996 if (!tmp_idx)
997 return -1;
998
999 new_pack = parse_pack_index(sha1, tmp_idx);
1000 if (!new_pack) {
1001 unlink(tmp_idx);
1002 free(tmp_idx);
1003
1004 return -1; /* parse_pack_index() already issued error message */
1005 }
1006
1007 ret = verify_pack_index(new_pack);
1008 if (!ret) {
1009 close_pack_index(new_pack);
1010 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1011 }
1012 free(tmp_idx);
1013 if (ret)
1014 return -1;
1015
1016 add_pack:
1017 new_pack->next = *packs_head;
1018 *packs_head = new_pack;
1019 return 0;
1020 }
1021
1022 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1023 {
1024 int ret = 0, i = 0;
1025 char *url, *data;
1026 struct strbuf buf = STRBUF_INIT;
1027 unsigned char sha1[20];
1028
1029 end_url_with_slash(&buf, base_url);
1030 strbuf_addstr(&buf, "objects/info/packs");
1031 url = strbuf_detach(&buf, NULL);
1032
1033 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1034 if (ret != HTTP_OK)
1035 goto cleanup;
1036
1037 data = buf.buf;
1038 while (i < buf.len) {
1039 switch (data[i]) {
1040 case 'P':
1041 i++;
1042 if (i + 52 <= buf.len &&
1043 !prefixcmp(data + i, " pack-") &&
1044 !prefixcmp(data + i + 46, ".pack\n")) {
1045 get_sha1_hex(data + i + 6, sha1);
1046 fetch_and_setup_pack_index(packs_head, sha1,
1047 base_url);
1048 i += 51;
1049 break;
1050 }
1051 default:
1052 while (i < buf.len && data[i] != '\n')
1053 i++;
1054 }
1055 i++;
1056 }
1057
1058 cleanup:
1059 free(url);
1060 return ret;
1061 }
1062
1063 void release_http_pack_request(struct http_pack_request *preq)
1064 {
1065 if (preq->packfile != NULL) {
1066 fclose(preq->packfile);
1067 preq->packfile = NULL;
1068 }
1069 if (preq->range_header != NULL) {
1070 curl_slist_free_all(preq->range_header);
1071 preq->range_header = NULL;
1072 }
1073 preq->slot = NULL;
1074 free(preq->url);
1075 }
1076
1077 int finish_http_pack_request(struct http_pack_request *preq)
1078 {
1079 struct packed_git **lst;
1080 struct packed_git *p = preq->target;
1081 char *tmp_idx;
1082 struct child_process ip;
1083 const char *ip_argv[8];
1084
1085 close_pack_index(p);
1086
1087 fclose(preq->packfile);
1088 preq->packfile = NULL;
1089
1090 lst = preq->lst;
1091 while (*lst != p)
1092 lst = &((*lst)->next);
1093 *lst = (*lst)->next;
1094
1095 tmp_idx = xstrdup(preq->tmpfile);
1096 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1097 ".idx.temp");
1098
1099 ip_argv[0] = "index-pack";
1100 ip_argv[1] = "-o";
1101 ip_argv[2] = tmp_idx;
1102 ip_argv[3] = preq->tmpfile;
1103 ip_argv[4] = NULL;
1104
1105 memset(&ip, 0, sizeof(ip));
1106 ip.argv = ip_argv;
1107 ip.git_cmd = 1;
1108 ip.no_stdin = 1;
1109 ip.no_stdout = 1;
1110
1111 if (run_command(&ip)) {
1112 unlink(preq->tmpfile);
1113 unlink(tmp_idx);
1114 free(tmp_idx);
1115 return -1;
1116 }
1117
1118 unlink(sha1_pack_index_name(p->sha1));
1119
1120 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1121 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1122 free(tmp_idx);
1123 return -1;
1124 }
1125
1126 install_packed_git(p);
1127 free(tmp_idx);
1128 return 0;
1129 }
1130
1131 struct http_pack_request *new_http_pack_request(
1132 struct packed_git *target, const char *base_url)
1133 {
1134 long prev_posn = 0;
1135 char range[RANGE_HEADER_SIZE];
1136 struct strbuf buf = STRBUF_INIT;
1137 struct http_pack_request *preq;
1138
1139 preq = xcalloc(1, sizeof(*preq));
1140 preq->target = target;
1141
1142 end_url_with_slash(&buf, base_url);
1143 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1144 sha1_to_hex(target->sha1));
1145 preq->url = strbuf_detach(&buf, NULL);
1146
1147 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1148 sha1_pack_name(target->sha1));
1149 preq->packfile = fopen(preq->tmpfile, "a");
1150 if (!preq->packfile) {
1151 error("Unable to open local file %s for pack",
1152 preq->tmpfile);
1153 goto abort;
1154 }
1155
1156 preq->slot = get_active_slot();
1157 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1158 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1159 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1160 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1161 no_pragma_header);
1162
1163 /*
1164 * If there is data present from a previous transfer attempt,
1165 * resume where it left off
1166 */
1167 prev_posn = ftell(preq->packfile);
1168 if (prev_posn>0) {
1169 if (http_is_verbose)
1170 fprintf(stderr,
1171 "Resuming fetch of pack %s at byte %ld\n",
1172 sha1_to_hex(target->sha1), prev_posn);
1173 sprintf(range, "Range: bytes=%ld-", prev_posn);
1174 preq->range_header = curl_slist_append(NULL, range);
1175 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1176 preq->range_header);
1177 }
1178
1179 return preq;
1180
1181 abort:
1182 free(preq->url);
1183 free(preq);
1184 return NULL;
1185 }
1186
1187 /* Helpers for fetching objects (loose) */
1188 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1189 void *data)
1190 {
1191 unsigned char expn[4096];
1192 size_t size = eltsize * nmemb;
1193 int posn = 0;
1194 struct http_object_request *freq =
1195 (struct http_object_request *)data;
1196 do {
1197 ssize_t retval = xwrite(freq->localfile,
1198 (char *) ptr + posn, size - posn);
1199 if (retval < 0)
1200 return posn;
1201 posn += retval;
1202 } while (posn < size);
1203
1204 freq->stream.avail_in = size;
1205 freq->stream.next_in = (void *)ptr;
1206 do {
1207 freq->stream.next_out = expn;
1208 freq->stream.avail_out = sizeof(expn);
1209 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1210 git_SHA1_Update(&freq->c, expn,
1211 sizeof(expn) - freq->stream.avail_out);
1212 } while (freq->stream.avail_in && freq->zret == Z_OK);
1213 return size;
1214 }
1215
1216 struct http_object_request *new_http_object_request(const char *base_url,
1217 unsigned char *sha1)
1218 {
1219 char *hex = sha1_to_hex(sha1);
1220 char *filename;
1221 char prevfile[PATH_MAX];
1222 int prevlocal;
1223 char prev_buf[PREV_BUF_SIZE];
1224 ssize_t prev_read = 0;
1225 long prev_posn = 0;
1226 char range[RANGE_HEADER_SIZE];
1227 struct curl_slist *range_header = NULL;
1228 struct http_object_request *freq;
1229
1230 freq = xcalloc(1, sizeof(*freq));
1231 hashcpy(freq->sha1, sha1);
1232 freq->localfile = -1;
1233
1234 filename = sha1_file_name(sha1);
1235 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1236 "%s.temp", filename);
1237
1238 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1239 unlink_or_warn(prevfile);
1240 rename(freq->tmpfile, prevfile);
1241 unlink_or_warn(freq->tmpfile);
1242
1243 if (freq->localfile != -1)
1244 error("fd leakage in start: %d", freq->localfile);
1245 freq->localfile = open(freq->tmpfile,
1246 O_WRONLY | O_CREAT | O_EXCL, 0666);
1247 /*
1248 * This could have failed due to the "lazy directory creation";
1249 * try to mkdir the last path component.
1250 */
1251 if (freq->localfile < 0 && errno == ENOENT) {
1252 char *dir = strrchr(freq->tmpfile, '/');
1253 if (dir) {
1254 *dir = 0;
1255 mkdir(freq->tmpfile, 0777);
1256 *dir = '/';
1257 }
1258 freq->localfile = open(freq->tmpfile,
1259 O_WRONLY | O_CREAT | O_EXCL, 0666);
1260 }
1261
1262 if (freq->localfile < 0) {
1263 error("Couldn't create temporary file %s: %s",
1264 freq->tmpfile, strerror(errno));
1265 goto abort;
1266 }
1267
1268 git_inflate_init(&freq->stream);
1269
1270 git_SHA1_Init(&freq->c);
1271
1272 freq->url = get_remote_object_url(base_url, hex, 0);
1273
1274 /*
1275 * If a previous temp file is present, process what was already
1276 * fetched.
1277 */
1278 prevlocal = open(prevfile, O_RDONLY);
1279 if (prevlocal != -1) {
1280 do {
1281 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1282 if (prev_read>0) {
1283 if (fwrite_sha1_file(prev_buf,
1284 1,
1285 prev_read,
1286 freq) == prev_read) {
1287 prev_posn += prev_read;
1288 } else {
1289 prev_read = -1;
1290 }
1291 }
1292 } while (prev_read > 0);
1293 close(prevlocal);
1294 }
1295 unlink_or_warn(prevfile);
1296
1297 /*
1298 * Reset inflate/SHA1 if there was an error reading the previous temp
1299 * file; also rewind to the beginning of the local file.
1300 */
1301 if (prev_read == -1) {
1302 memset(&freq->stream, 0, sizeof(freq->stream));
1303 git_inflate_init(&freq->stream);
1304 git_SHA1_Init(&freq->c);
1305 if (prev_posn>0) {
1306 prev_posn = 0;
1307 lseek(freq->localfile, 0, SEEK_SET);
1308 if (ftruncate(freq->localfile, 0) < 0) {
1309 error("Couldn't truncate temporary file %s: %s",
1310 freq->tmpfile, strerror(errno));
1311 goto abort;
1312 }
1313 }
1314 }
1315
1316 freq->slot = get_active_slot();
1317
1318 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1319 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1320 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1321 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1322 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1323
1324 /*
1325 * If we have successfully processed data from a previous fetch
1326 * attempt, only fetch the data we don't already have.
1327 */
1328 if (prev_posn>0) {
1329 if (http_is_verbose)
1330 fprintf(stderr,
1331 "Resuming fetch of object %s at byte %ld\n",
1332 hex, prev_posn);
1333 sprintf(range, "Range: bytes=%ld-", prev_posn);
1334 range_header = curl_slist_append(range_header, range);
1335 curl_easy_setopt(freq->slot->curl,
1336 CURLOPT_HTTPHEADER, range_header);
1337 }
1338
1339 return freq;
1340
1341 abort:
1342 free(freq->url);
1343 free(freq);
1344 return NULL;
1345 }
1346
1347 void process_http_object_request(struct http_object_request *freq)
1348 {
1349 if (freq->slot == NULL)
1350 return;
1351 freq->curl_result = freq->slot->curl_result;
1352 freq->http_code = freq->slot->http_code;
1353 freq->slot = NULL;
1354 }
1355
1356 int finish_http_object_request(struct http_object_request *freq)
1357 {
1358 struct stat st;
1359
1360 close(freq->localfile);
1361 freq->localfile = -1;
1362
1363 process_http_object_request(freq);
1364
1365 if (freq->http_code == 416) {
1366 warning("requested range invalid; we may already have all the data.");
1367 } else if (freq->curl_result != CURLE_OK) {
1368 if (stat(freq->tmpfile, &st) == 0)
1369 if (st.st_size == 0)
1370 unlink_or_warn(freq->tmpfile);
1371 return -1;
1372 }
1373
1374 git_inflate_end(&freq->stream);
1375 git_SHA1_Final(freq->real_sha1, &freq->c);
1376 if (freq->zret != Z_STREAM_END) {
1377 unlink_or_warn(freq->tmpfile);
1378 return -1;
1379 }
1380 if (hashcmp(freq->sha1, freq->real_sha1)) {
1381 unlink_or_warn(freq->tmpfile);
1382 return -1;
1383 }
1384 freq->rename =
1385 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1386
1387 return freq->rename;
1388 }
1389
1390 void abort_http_object_request(struct http_object_request *freq)
1391 {
1392 unlink_or_warn(freq->tmpfile);
1393
1394 release_http_object_request(freq);
1395 }
1396
1397 void release_http_object_request(struct http_object_request *freq)
1398 {
1399 if (freq->localfile != -1) {
1400 close(freq->localfile);
1401 freq->localfile = -1;
1402 }
1403 if (freq->url != NULL) {
1404 free(freq->url);
1405 freq->url = NULL;
1406 }
1407 if (freq->slot != NULL) {
1408 freq->slot->callback_func = NULL;
1409 freq->slot->callback_data = NULL;
1410 release_active_slot(freq->slot);
1411 freq->slot = NULL;
1412 }
1413 }
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