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http-backend: use end_url_with_slash()
[git.git] / http.c
blob3b3da12e0fb732438fcb7438160e6001afc189fa
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 char *user_name, *user_pass;
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(void *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(const void *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 data_received++;
102 return size;
103 }
104
105 size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
106 {
107 data_received++;
108 return eltsize * nmemb;
109 }
110
111 #ifdef USE_CURL_MULTI
112 static void process_curl_messages(void)
113 {
114 int num_messages;
115 struct active_request_slot *slot;
116 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
117
118 while (curl_message != NULL) {
119 if (curl_message->msg == CURLMSG_DONE) {
120 int curl_result = curl_message->data.result;
121 slot = active_queue_head;
122 while (slot != NULL &&
123 slot->curl != curl_message->easy_handle)
124 slot = slot->next;
125 if (slot != NULL) {
126 curl_multi_remove_handle(curlm, slot->curl);
127 slot->curl_result = curl_result;
128 finish_active_slot(slot);
129 } else {
130 fprintf(stderr, "Received DONE message for unknown request!\n");
131 }
132 } else {
133 fprintf(stderr, "Unknown CURL message received: %d\n",
134 (int)curl_message->msg);
135 }
136 curl_message = curl_multi_info_read(curlm, &num_messages);
137 }
138 }
139 #endif
140
141 static int http_options(const char *var, const char *value, void *cb)
142 {
143 if (!strcmp("http.sslverify", var)) {
144 curl_ssl_verify = git_config_bool(var, value);
145 return 0;
146 }
147 if (!strcmp("http.sslcert", var))
148 return git_config_string(&ssl_cert, var, value);
149 #if LIBCURL_VERSION_NUM >= 0x070903
150 if (!strcmp("http.sslkey", var))
151 return git_config_string(&ssl_key, var, value);
152 #endif
153 #if LIBCURL_VERSION_NUM >= 0x070908
154 if (!strcmp("http.sslcapath", var))
155 return git_config_string(&ssl_capath, var, value);
156 #endif
157 if (!strcmp("http.sslcainfo", var))
158 return git_config_string(&ssl_cainfo, var, value);
159 if (!strcmp("http.sslcertpasswordprotected", var)) {
160 if (git_config_bool(var, value))
161 ssl_cert_password_required = 1;
162 return 0;
163 }
164 if (!strcmp("http.minsessions", var)) {
165 min_curl_sessions = git_config_int(var, value);
166 #ifndef USE_CURL_MULTI
167 if (min_curl_sessions > 1)
168 min_curl_sessions = 1;
169 #endif
170 return 0;
171 }
172 #ifdef USE_CURL_MULTI
173 if (!strcmp("http.maxrequests", var)) {
174 max_requests = git_config_int(var, value);
175 return 0;
176 }
177 #endif
178 if (!strcmp("http.lowspeedlimit", var)) {
179 curl_low_speed_limit = (long)git_config_int(var, value);
180 return 0;
181 }
182 if (!strcmp("http.lowspeedtime", var)) {
183 curl_low_speed_time = (long)git_config_int(var, value);
184 return 0;
185 }
186
187 if (!strcmp("http.noepsv", var)) {
188 curl_ftp_no_epsv = git_config_bool(var, value);
189 return 0;
190 }
191 if (!strcmp("http.proxy", var))
192 return git_config_string(&curl_http_proxy, var, value);
193
194 if (!strcmp("http.postbuffer", var)) {
195 http_post_buffer = git_config_int(var, value);
196 if (http_post_buffer < LARGE_PACKET_MAX)
197 http_post_buffer = LARGE_PACKET_MAX;
198 return 0;
199 }
200
201 if (!strcmp("http.useragent", var))
202 return git_config_string(&user_agent, var, value);
203
204 /* Fall back on the default ones */
205 return git_default_config(var, value, cb);
206 }
207
208 static void init_curl_http_auth(CURL *result)
209 {
210 if (user_name) {
211 struct strbuf up = STRBUF_INIT;
212 if (!user_pass)
213 user_pass = xstrdup(git_getpass("Password: "));
214 strbuf_addf(&up, "%s:%s", user_name, user_pass);
215 curl_easy_setopt(result, CURLOPT_USERPWD,
216 strbuf_detach(&up, NULL));
217 }
218 }
219
220 static int has_cert_password(void)
221 {
222 if (ssl_cert_password != NULL)
223 return 1;
224 if (ssl_cert == NULL || ssl_cert_password_required != 1)
225 return 0;
226 /* Only prompt the user once. */
227 ssl_cert_password_required = -1;
228 ssl_cert_password = git_getpass("Certificate Password: ");
229 if (ssl_cert_password != NULL) {
230 ssl_cert_password = xstrdup(ssl_cert_password);
231 return 1;
232 } else
233 return 0;
234 }
235
236 static CURL *get_curl_handle(void)
237 {
238 CURL *result = curl_easy_init();
239
240 if (!curl_ssl_verify) {
241 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
242 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
243 } else {
244 /* Verify authenticity of the peer's certificate */
245 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
246 /* The name in the cert must match whom we tried to connect */
247 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
248 }
249
250 #if LIBCURL_VERSION_NUM >= 0x070907
251 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
252 #endif
253 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
254 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
255 #endif
256
257 init_curl_http_auth(result);
258
259 if (ssl_cert != NULL)
260 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
261 if (has_cert_password())
262 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
263 #if LIBCURL_VERSION_NUM >= 0x070903
264 if (ssl_key != NULL)
265 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
266 #endif
267 #if LIBCURL_VERSION_NUM >= 0x070908
268 if (ssl_capath != NULL)
269 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
270 #endif
271 if (ssl_cainfo != NULL)
272 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
273 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
274
275 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
276 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
277 curl_low_speed_limit);
278 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
279 curl_low_speed_time);
280 }
281
282 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
283
284 if (getenv("GIT_CURL_VERBOSE"))
285 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
286
287 curl_easy_setopt(result, CURLOPT_USERAGENT,
288 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
289
290 if (curl_ftp_no_epsv)
291 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
292
293 if (curl_http_proxy)
294 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
295
296 return result;
297 }
298
299 static void http_auth_init(const char *url)
300 {
301 char *at, *colon, *cp, *slash;
302 int len;
303
304 cp = strstr(url, "://");
305 if (!cp)
306 return;
307
308 /*
309 * Ok, the URL looks like "proto://something". Which one?
310 * "proto://<user>:<pass>@<host>/...",
311 * "proto://<user>@<host>/...", or just
312 * "proto://<host>/..."?
313 */
314 cp += 3;
315 at = strchr(cp, '@');
316 colon = strchr(cp, ':');
317 slash = strchrnul(cp, '/');
318 if (!at || slash <= at)
319 return; /* No credentials */
320 if (!colon || at <= colon) {
321 /* Only username */
322 len = at - cp;
323 user_name = xmalloc(len + 1);
324 memcpy(user_name, cp, len);
325 user_name[len] = '\0';
326 user_pass = NULL;
327 } else {
328 len = colon - cp;
329 user_name = xmalloc(len + 1);
330 memcpy(user_name, cp, len);
331 user_name[len] = '\0';
332 len = at - (colon + 1);
333 user_pass = xmalloc(len + 1);
334 memcpy(user_pass, colon + 1, len);
335 user_pass[len] = '\0';
336 }
337 }
338
339 static void set_from_env(const char **var, const char *envname)
340 {
341 const char *val = getenv(envname);
342 if (val)
343 *var = val;
344 }
345
346 void http_init(struct remote *remote)
347 {
348 char *low_speed_limit;
349 char *low_speed_time;
350
351 http_is_verbose = 0;
352
353 git_config(http_options, NULL);
354
355 curl_global_init(CURL_GLOBAL_ALL);
356
357 if (remote && remote->http_proxy)
358 curl_http_proxy = xstrdup(remote->http_proxy);
359
360 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
361 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
362
363 #ifdef USE_CURL_MULTI
364 {
365 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
366 if (http_max_requests != NULL)
367 max_requests = atoi(http_max_requests);
368 }
369
370 curlm = curl_multi_init();
371 if (curlm == NULL) {
372 fprintf(stderr, "Error creating curl multi handle.\n");
373 exit(1);
374 }
375 #endif
376
377 if (getenv("GIT_SSL_NO_VERIFY"))
378 curl_ssl_verify = 0;
379
380 set_from_env(&ssl_cert, "GIT_SSL_CERT");
381 #if LIBCURL_VERSION_NUM >= 0x070903
382 set_from_env(&ssl_key, "GIT_SSL_KEY");
383 #endif
384 #if LIBCURL_VERSION_NUM >= 0x070908
385 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
386 #endif
387 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
388
389 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
390
391 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
392 if (low_speed_limit != NULL)
393 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
394 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
395 if (low_speed_time != NULL)
396 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
397
398 if (curl_ssl_verify == -1)
399 curl_ssl_verify = 1;
400
401 curl_session_count = 0;
402 #ifdef USE_CURL_MULTI
403 if (max_requests < 1)
404 max_requests = DEFAULT_MAX_REQUESTS;
405 #endif
406
407 if (getenv("GIT_CURL_FTP_NO_EPSV"))
408 curl_ftp_no_epsv = 1;
409
410 if (remote && remote->url && remote->url[0]) {
411 http_auth_init(remote->url[0]);
412 if (!ssl_cert_password_required &&
413 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
414 !prefixcmp(remote->url[0], "https://"))
415 ssl_cert_password_required = 1;
416 }
417
418 #ifndef NO_CURL_EASY_DUPHANDLE
419 curl_default = get_curl_handle();
420 #endif
421 }
422
423 void http_cleanup(void)
424 {
425 struct active_request_slot *slot = active_queue_head;
426
427 while (slot != NULL) {
428 struct active_request_slot *next = slot->next;
429 if (slot->curl != NULL) {
430 #ifdef USE_CURL_MULTI
431 curl_multi_remove_handle(curlm, slot->curl);
432 #endif
433 curl_easy_cleanup(slot->curl);
434 }
435 free(slot);
436 slot = next;
437 }
438 active_queue_head = NULL;
439
440 #ifndef NO_CURL_EASY_DUPHANDLE
441 curl_easy_cleanup(curl_default);
442 #endif
443
444 #ifdef USE_CURL_MULTI
445 curl_multi_cleanup(curlm);
446 #endif
447 curl_global_cleanup();
448
449 curl_slist_free_all(pragma_header);
450 pragma_header = NULL;
451
452 curl_slist_free_all(no_pragma_header);
453 no_pragma_header = NULL;
454
455 if (curl_http_proxy) {
456 free((void *)curl_http_proxy);
457 curl_http_proxy = NULL;
458 }
459
460 if (ssl_cert_password != NULL) {
461 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
462 free(ssl_cert_password);
463 ssl_cert_password = NULL;
464 }
465 ssl_cert_password_required = 0;
466 }
467
468 struct active_request_slot *get_active_slot(void)
469 {
470 struct active_request_slot *slot = active_queue_head;
471 struct active_request_slot *newslot;
472
473 #ifdef USE_CURL_MULTI
474 int num_transfers;
475
476 /* Wait for a slot to open up if the queue is full */
477 while (active_requests >= max_requests) {
478 curl_multi_perform(curlm, &num_transfers);
479 if (num_transfers < active_requests)
480 process_curl_messages();
481 }
482 #endif
483
484 while (slot != NULL && slot->in_use)
485 slot = slot->next;
486
487 if (slot == NULL) {
488 newslot = xmalloc(sizeof(*newslot));
489 newslot->curl = NULL;
490 newslot->in_use = 0;
491 newslot->next = NULL;
492
493 slot = active_queue_head;
494 if (slot == NULL) {
495 active_queue_head = newslot;
496 } else {
497 while (slot->next != NULL)
498 slot = slot->next;
499 slot->next = newslot;
500 }
501 slot = newslot;
502 }
503
504 if (slot->curl == NULL) {
505 #ifdef NO_CURL_EASY_DUPHANDLE
506 slot->curl = get_curl_handle();
507 #else
508 slot->curl = curl_easy_duphandle(curl_default);
509 #endif
510 curl_session_count++;
511 }
512
513 active_requests++;
514 slot->in_use = 1;
515 slot->local = NULL;
516 slot->results = NULL;
517 slot->finished = NULL;
518 slot->callback_data = NULL;
519 slot->callback_func = NULL;
520 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
521 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
522 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
523 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
524 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
525 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
526 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
527
528 return slot;
529 }
530
531 int start_active_slot(struct active_request_slot *slot)
532 {
533 #ifdef USE_CURL_MULTI
534 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
535 int num_transfers;
536
537 if (curlm_result != CURLM_OK &&
538 curlm_result != CURLM_CALL_MULTI_PERFORM) {
539 active_requests--;
540 slot->in_use = 0;
541 return 0;
542 }
543
544 /*
545 * We know there must be something to do, since we just added
546 * something.
547 */
548 curl_multi_perform(curlm, &num_transfers);
549 #endif
550 return 1;
551 }
552
553 #ifdef USE_CURL_MULTI
554 struct fill_chain {
555 void *data;
556 int (*fill)(void *);
557 struct fill_chain *next;
558 };
559
560 static struct fill_chain *fill_cfg;
561
562 void add_fill_function(void *data, int (*fill)(void *))
563 {
564 struct fill_chain *new = xmalloc(sizeof(*new));
565 struct fill_chain **linkp = &fill_cfg;
566 new->data = data;
567 new->fill = fill;
568 new->next = NULL;
569 while (*linkp)
570 linkp = &(*linkp)->next;
571 *linkp = new;
572 }
573
574 void fill_active_slots(void)
575 {
576 struct active_request_slot *slot = active_queue_head;
577
578 while (active_requests < max_requests) {
579 struct fill_chain *fill;
580 for (fill = fill_cfg; fill; fill = fill->next)
581 if (fill->fill(fill->data))
582 break;
583
584 if (!fill)
585 break;
586 }
587
588 while (slot != NULL) {
589 if (!slot->in_use && slot->curl != NULL
590 && curl_session_count > min_curl_sessions) {
591 curl_easy_cleanup(slot->curl);
592 slot->curl = NULL;
593 curl_session_count--;
594 }
595 slot = slot->next;
596 }
597 }
598
599 void step_active_slots(void)
600 {
601 int num_transfers;
602 CURLMcode curlm_result;
603
604 do {
605 curlm_result = curl_multi_perform(curlm, &num_transfers);
606 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
607 if (num_transfers < active_requests) {
608 process_curl_messages();
609 fill_active_slots();
610 }
611 }
612 #endif
613
614 void run_active_slot(struct active_request_slot *slot)
615 {
616 #ifdef USE_CURL_MULTI
617 long last_pos = 0;
618 long current_pos;
619 fd_set readfds;
620 fd_set writefds;
621 fd_set excfds;
622 int max_fd;
623 struct timeval select_timeout;
624 int finished = 0;
625
626 slot->finished = &finished;
627 while (!finished) {
628 data_received = 0;
629 step_active_slots();
630
631 if (!data_received && slot->local != NULL) {
632 current_pos = ftell(slot->local);
633 if (current_pos > last_pos)
634 data_received++;
635 last_pos = current_pos;
636 }
637
638 if (slot->in_use && !data_received) {
639 max_fd = 0;
640 FD_ZERO(&readfds);
641 FD_ZERO(&writefds);
642 FD_ZERO(&excfds);
643 select_timeout.tv_sec = 0;
644 select_timeout.tv_usec = 50000;
645 select(max_fd, &readfds, &writefds,
646 &excfds, &select_timeout);
647 }
648 }
649 #else
650 while (slot->in_use) {
651 slot->curl_result = curl_easy_perform(slot->curl);
652 finish_active_slot(slot);
653 }
654 #endif
655 }
656
657 static void closedown_active_slot(struct active_request_slot *slot)
658 {
659 active_requests--;
660 slot->in_use = 0;
661 }
662
663 static void release_active_slot(struct active_request_slot *slot)
664 {
665 closedown_active_slot(slot);
666 if (slot->curl && curl_session_count > min_curl_sessions) {
667 #ifdef USE_CURL_MULTI
668 curl_multi_remove_handle(curlm, slot->curl);
669 #endif
670 curl_easy_cleanup(slot->curl);
671 slot->curl = NULL;
672 curl_session_count--;
673 }
674 #ifdef USE_CURL_MULTI
675 fill_active_slots();
676 #endif
677 }
678
679 void finish_active_slot(struct active_request_slot *slot)
680 {
681 closedown_active_slot(slot);
682 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
683
684 if (slot->finished != NULL)
685 (*slot->finished) = 1;
686
687 /* Store slot results so they can be read after the slot is reused */
688 if (slot->results != NULL) {
689 slot->results->curl_result = slot->curl_result;
690 slot->results->http_code = slot->http_code;
691 }
692
693 /* Run callback if appropriate */
694 if (slot->callback_func != NULL)
695 slot->callback_func(slot->callback_data);
696 }
697
698 void finish_all_active_slots(void)
699 {
700 struct active_request_slot *slot = active_queue_head;
701
702 while (slot != NULL)
703 if (slot->in_use) {
704 run_active_slot(slot);
705 slot = active_queue_head;
706 } else {
707 slot = slot->next;
708 }
709 }
710
711 /* Helpers for modifying and creating URLs */
712 static inline int needs_quote(int ch)
713 {
714 if (((ch >= 'A') && (ch <= 'Z'))
715 || ((ch >= 'a') && (ch <= 'z'))
716 || ((ch >= '0') && (ch <= '9'))
717 || (ch == '/')
718 || (ch == '-')
719 || (ch == '.'))
720 return 0;
721 return 1;
722 }
723
724 static inline int hex(int v)
725 {
726 if (v < 10)
727 return '0' + v;
728 else
729 return 'A' + v - 10;
730 }
731
732 static char *quote_ref_url(const char *base, const char *ref)
733 {
734 struct strbuf buf = STRBUF_INIT;
735 const char *cp;
736 int ch;
737
738 end_url_with_slash(&buf, base);
739
740 for (cp = ref; (ch = *cp) != 0; cp++)
741 if (needs_quote(ch))
742 strbuf_addf(&buf, "%%%02x", ch);
743 else
744 strbuf_addch(&buf, *cp);
745
746 return strbuf_detach(&buf, NULL);
747 }
748
749 void append_remote_object_url(struct strbuf *buf, const char *url,
750 const char *hex,
751 int only_two_digit_prefix)
752 {
753 end_url_with_slash(buf, url);
754
755 strbuf_addf(buf, "objects/%.*s/", 2, hex);
756 if (!only_two_digit_prefix)
757 strbuf_addf(buf, "%s", hex+2);
758 }
759
760 char *get_remote_object_url(const char *url, const char *hex,
761 int only_two_digit_prefix)
762 {
763 struct strbuf buf = STRBUF_INIT;
764 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
765 return strbuf_detach(&buf, NULL);
766 }
767
768 /* http_request() targets */
769 #define HTTP_REQUEST_STRBUF 0
770 #define HTTP_REQUEST_FILE 1
771
772 static int http_request(const char *url, void *result, int target, int options)
773 {
774 struct active_request_slot *slot;
775 struct slot_results results;
776 struct curl_slist *headers = NULL;
777 struct strbuf buf = STRBUF_INIT;
778 int ret;
779
780 slot = get_active_slot();
781 slot->results = &results;
782 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
783
784 if (result == NULL) {
785 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
786 } else {
787 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
788 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
789
790 if (target == HTTP_REQUEST_FILE) {
791 long posn = ftell(result);
792 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
793 fwrite);
794 if (posn > 0) {
795 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
796 headers = curl_slist_append(headers, buf.buf);
797 strbuf_reset(&buf);
798 }
799 slot->local = result;
800 } else
801 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
802 fwrite_buffer);
803 }
804
805 strbuf_addstr(&buf, "Pragma:");
806 if (options & HTTP_NO_CACHE)
807 strbuf_addstr(&buf, " no-cache");
808
809 headers = curl_slist_append(headers, buf.buf);
810
811 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
812 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
813
814 if (start_active_slot(slot)) {
815 run_active_slot(slot);
816 if (results.curl_result == CURLE_OK)
817 ret = HTTP_OK;
818 else if (missing_target(&results))
819 ret = HTTP_MISSING_TARGET;
820 else if (results.http_code == 401) {
821 if (user_name) {
822 ret = HTTP_NOAUTH;
823 } else {
824 /*
825 * git_getpass is needed here because its very likely stdin/stdout are
826 * pipes to our parent process. So we instead need to use /dev/tty,
827 * but that is non-portable. Using git_getpass() can at least be stubbed
828 * on other platforms with a different implementation if/when necessary.
829 */
830 user_name = xstrdup(git_getpass("Username: "));
831 init_curl_http_auth(slot->curl);
832 ret = HTTP_REAUTH;
833 }
834 } else
835 ret = HTTP_ERROR;
836 } else {
837 error("Unable to start HTTP request for %s", url);
838 ret = HTTP_START_FAILED;
839 }
840
841 slot->local = NULL;
842 curl_slist_free_all(headers);
843 strbuf_release(&buf);
844
845 return ret;
846 }
847
848 int http_get_strbuf(const char *url, struct strbuf *result, int options)
849 {
850 int http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
851 if (http_ret == HTTP_REAUTH) {
852 http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
853 }
854 return http_ret;
855 }
856
857 /*
858 * Downloads an url and stores the result in the given file.
859 *
860 * If a previous interrupted download is detected (i.e. a previous temporary
861 * file is still around) the download is resumed.
862 */
863 static int http_get_file(const char *url, const char *filename, int options)
864 {
865 int ret;
866 struct strbuf tmpfile = STRBUF_INIT;
867 FILE *result;
868
869 strbuf_addf(&tmpfile, "%s.temp", filename);
870 result = fopen(tmpfile.buf, "a");
871 if (! result) {
872 error("Unable to open local file %s", tmpfile.buf);
873 ret = HTTP_ERROR;
874 goto cleanup;
875 }
876
877 ret = http_request(url, result, HTTP_REQUEST_FILE, options);
878 fclose(result);
879
880 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
881 ret = HTTP_ERROR;
882 cleanup:
883 strbuf_release(&tmpfile);
884 return ret;
885 }
886
887 int http_error(const char *url, int ret)
888 {
889 /* http_request has already handled HTTP_START_FAILED. */
890 if (ret != HTTP_START_FAILED)
891 error("%s while accessing %s\n", curl_errorstr, url);
892
893 return ret;
894 }
895
896 int http_fetch_ref(const char *base, struct ref *ref)
897 {
898 char *url;
899 struct strbuf buffer = STRBUF_INIT;
900 int ret = -1;
901
902 url = quote_ref_url(base, ref->name);
903 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
904 strbuf_rtrim(&buffer);
905 if (buffer.len == 40)
906 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
907 else if (!prefixcmp(buffer.buf, "ref: ")) {
908 ref->symref = xstrdup(buffer.buf + 5);
909 ret = 0;
910 }
911 }
912
913 strbuf_release(&buffer);
914 free(url);
915 return ret;
916 }
917
918 /* Helpers for fetching packs */
919 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
920 {
921 char *url, *tmp;
922 struct strbuf buf = STRBUF_INIT;
923
924 if (http_is_verbose)
925 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
926
927 end_url_with_slash(&buf, base_url);
928 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
929 url = strbuf_detach(&buf, NULL);
930
931 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
932 tmp = strbuf_detach(&buf, NULL);
933
934 if (http_get_file(url, tmp, 0) != HTTP_OK) {
935 error("Unable to get pack index %s\n", url);
936 free(tmp);
937 tmp = NULL;
938 }
939
940 free(url);
941 return tmp;
942 }
943
944 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
945 unsigned char *sha1, const char *base_url)
946 {
947 struct packed_git *new_pack;
948 char *tmp_idx = NULL;
949 int ret;
950
951 if (has_pack_index(sha1)) {
952 new_pack = parse_pack_index(sha1, NULL);
953 if (!new_pack)
954 return -1; /* parse_pack_index() already issued error message */
955 goto add_pack;
956 }
957
958 tmp_idx = fetch_pack_index(sha1, base_url);
959 if (!tmp_idx)
960 return -1;
961
962 new_pack = parse_pack_index(sha1, tmp_idx);
963 if (!new_pack) {
964 unlink(tmp_idx);
965 free(tmp_idx);
966
967 return -1; /* parse_pack_index() already issued error message */
968 }
969
970 ret = verify_pack_index(new_pack);
971 if (!ret) {
972 close_pack_index(new_pack);
973 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
974 }
975 free(tmp_idx);
976 if (ret)
977 return -1;
978
979 add_pack:
980 new_pack->next = *packs_head;
981 *packs_head = new_pack;
982 return 0;
983 }
984
985 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
986 {
987 int ret = 0, i = 0;
988 char *url, *data;
989 struct strbuf buf = STRBUF_INIT;
990 unsigned char sha1[20];
991
992 end_url_with_slash(&buf, base_url);
993 strbuf_addstr(&buf, "objects/info/packs");
994 url = strbuf_detach(&buf, NULL);
995
996 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
997 if (ret != HTTP_OK)
998 goto cleanup;
999
1000 data = buf.buf;
1001 while (i < buf.len) {
1002 switch (data[i]) {
1003 case 'P':
1004 i++;
1005 if (i + 52 <= buf.len &&
1006 !prefixcmp(data + i, " pack-") &&
1007 !prefixcmp(data + i + 46, ".pack\n")) {
1008 get_sha1_hex(data + i + 6, sha1);
1009 fetch_and_setup_pack_index(packs_head, sha1,
1010 base_url);
1011 i += 51;
1012 break;
1013 }
1014 default:
1015 while (i < buf.len && data[i] != '\n')
1016 i++;
1017 }
1018 i++;
1019 }
1020
1021 cleanup:
1022 free(url);
1023 return ret;
1024 }
1025
1026 void release_http_pack_request(struct http_pack_request *preq)
1027 {
1028 if (preq->packfile != NULL) {
1029 fclose(preq->packfile);
1030 preq->packfile = NULL;
1031 preq->slot->local = NULL;
1032 }
1033 if (preq->range_header != NULL) {
1034 curl_slist_free_all(preq->range_header);
1035 preq->range_header = NULL;
1036 }
1037 preq->slot = NULL;
1038 free(preq->url);
1039 }
1040
1041 int finish_http_pack_request(struct http_pack_request *preq)
1042 {
1043 struct packed_git **lst;
1044 struct packed_git *p = preq->target;
1045 char *tmp_idx;
1046 struct child_process ip;
1047 const char *ip_argv[8];
1048
1049 close_pack_index(p);
1050
1051 fclose(preq->packfile);
1052 preq->packfile = NULL;
1053 preq->slot->local = NULL;
1054
1055 lst = preq->lst;
1056 while (*lst != p)
1057 lst = &((*lst)->next);
1058 *lst = (*lst)->next;
1059
1060 tmp_idx = xstrdup(preq->tmpfile);
1061 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1062 ".idx.temp");
1063
1064 ip_argv[0] = "index-pack";
1065 ip_argv[1] = "-o";
1066 ip_argv[2] = tmp_idx;
1067 ip_argv[3] = preq->tmpfile;
1068 ip_argv[4] = NULL;
1069
1070 memset(&ip, 0, sizeof(ip));
1071 ip.argv = ip_argv;
1072 ip.git_cmd = 1;
1073 ip.no_stdin = 1;
1074 ip.no_stdout = 1;
1075
1076 if (run_command(&ip)) {
1077 unlink(preq->tmpfile);
1078 unlink(tmp_idx);
1079 free(tmp_idx);
1080 return -1;
1081 }
1082
1083 unlink(sha1_pack_index_name(p->sha1));
1084
1085 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1086 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1087 free(tmp_idx);
1088 return -1;
1089 }
1090
1091 install_packed_git(p);
1092 free(tmp_idx);
1093 return 0;
1094 }
1095
1096 struct http_pack_request *new_http_pack_request(
1097 struct packed_git *target, const char *base_url)
1098 {
1099 long prev_posn = 0;
1100 char range[RANGE_HEADER_SIZE];
1101 struct strbuf buf = STRBUF_INIT;
1102 struct http_pack_request *preq;
1103
1104 preq = xmalloc(sizeof(*preq));
1105 preq->target = target;
1106 preq->range_header = NULL;
1107
1108 end_url_with_slash(&buf, base_url);
1109 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1110 sha1_to_hex(target->sha1));
1111 preq->url = strbuf_detach(&buf, NULL);
1112
1113 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1114 sha1_pack_name(target->sha1));
1115 preq->packfile = fopen(preq->tmpfile, "a");
1116 if (!preq->packfile) {
1117 error("Unable to open local file %s for pack",
1118 preq->tmpfile);
1119 goto abort;
1120 }
1121
1122 preq->slot = get_active_slot();
1123 preq->slot->local = preq->packfile;
1124 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1125 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1126 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1127 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1128 no_pragma_header);
1129
1130 /*
1131 * If there is data present from a previous transfer attempt,
1132 * resume where it left off
1133 */
1134 prev_posn = ftell(preq->packfile);
1135 if (prev_posn>0) {
1136 if (http_is_verbose)
1137 fprintf(stderr,
1138 "Resuming fetch of pack %s at byte %ld\n",
1139 sha1_to_hex(target->sha1), prev_posn);
1140 sprintf(range, "Range: bytes=%ld-", prev_posn);
1141 preq->range_header = curl_slist_append(NULL, range);
1142 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1143 preq->range_header);
1144 }
1145
1146 return preq;
1147
1148 abort:
1149 free(preq->url);
1150 free(preq);
1151 return NULL;
1152 }
1153
1154 /* Helpers for fetching objects (loose) */
1155 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
1156 void *data)
1157 {
1158 unsigned char expn[4096];
1159 size_t size = eltsize * nmemb;
1160 int posn = 0;
1161 struct http_object_request *freq =
1162 (struct http_object_request *)data;
1163 do {
1164 ssize_t retval = xwrite(freq->localfile,
1165 (char *) ptr + posn, size - posn);
1166 if (retval < 0)
1167 return posn;
1168 posn += retval;
1169 } while (posn < size);
1170
1171 freq->stream.avail_in = size;
1172 freq->stream.next_in = ptr;
1173 do {
1174 freq->stream.next_out = expn;
1175 freq->stream.avail_out = sizeof(expn);
1176 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1177 git_SHA1_Update(&freq->c, expn,
1178 sizeof(expn) - freq->stream.avail_out);
1179 } while (freq->stream.avail_in && freq->zret == Z_OK);
1180 data_received++;
1181 return size;
1182 }
1183
1184 struct http_object_request *new_http_object_request(const char *base_url,
1185 unsigned char *sha1)
1186 {
1187 char *hex = sha1_to_hex(sha1);
1188 char *filename;
1189 char prevfile[PATH_MAX];
1190 int prevlocal;
1191 unsigned char prev_buf[PREV_BUF_SIZE];
1192 ssize_t prev_read = 0;
1193 long prev_posn = 0;
1194 char range[RANGE_HEADER_SIZE];
1195 struct curl_slist *range_header = NULL;
1196 struct http_object_request *freq;
1197
1198 freq = xmalloc(sizeof(*freq));
1199 hashcpy(freq->sha1, sha1);
1200 freq->localfile = -1;
1201
1202 filename = sha1_file_name(sha1);
1203 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1204 "%s.temp", filename);
1205
1206 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1207 unlink_or_warn(prevfile);
1208 rename(freq->tmpfile, prevfile);
1209 unlink_or_warn(freq->tmpfile);
1210
1211 if (freq->localfile != -1)
1212 error("fd leakage in start: %d", freq->localfile);
1213 freq->localfile = open(freq->tmpfile,
1214 O_WRONLY | O_CREAT | O_EXCL, 0666);
1215 /*
1216 * This could have failed due to the "lazy directory creation";
1217 * try to mkdir the last path component.
1218 */
1219 if (freq->localfile < 0 && errno == ENOENT) {
1220 char *dir = strrchr(freq->tmpfile, '/');
1221 if (dir) {
1222 *dir = 0;
1223 mkdir(freq->tmpfile, 0777);
1224 *dir = '/';
1225 }
1226 freq->localfile = open(freq->tmpfile,
1227 O_WRONLY | O_CREAT | O_EXCL, 0666);
1228 }
1229
1230 if (freq->localfile < 0) {
1231 error("Couldn't create temporary file %s: %s",
1232 freq->tmpfile, strerror(errno));
1233 goto abort;
1234 }
1235
1236 memset(&freq->stream, 0, sizeof(freq->stream));
1237
1238 git_inflate_init(&freq->stream);
1239
1240 git_SHA1_Init(&freq->c);
1241
1242 freq->url = get_remote_object_url(base_url, hex, 0);
1243
1244 /*
1245 * If a previous temp file is present, process what was already
1246 * fetched.
1247 */
1248 prevlocal = open(prevfile, O_RDONLY);
1249 if (prevlocal != -1) {
1250 do {
1251 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1252 if (prev_read>0) {
1253 if (fwrite_sha1_file(prev_buf,
1254 1,
1255 prev_read,
1256 freq) == prev_read) {
1257 prev_posn += prev_read;
1258 } else {
1259 prev_read = -1;
1260 }
1261 }
1262 } while (prev_read > 0);
1263 close(prevlocal);
1264 }
1265 unlink_or_warn(prevfile);
1266
1267 /*
1268 * Reset inflate/SHA1 if there was an error reading the previous temp
1269 * file; also rewind to the beginning of the local file.
1270 */
1271 if (prev_read == -1) {
1272 memset(&freq->stream, 0, sizeof(freq->stream));
1273 git_inflate_init(&freq->stream);
1274 git_SHA1_Init(&freq->c);
1275 if (prev_posn>0) {
1276 prev_posn = 0;
1277 lseek(freq->localfile, 0, SEEK_SET);
1278 if (ftruncate(freq->localfile, 0) < 0) {
1279 error("Couldn't truncate temporary file %s: %s",
1280 freq->tmpfile, strerror(errno));
1281 goto abort;
1282 }
1283 }
1284 }
1285
1286 freq->slot = get_active_slot();
1287
1288 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1289 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1290 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1291 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1292 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1293
1294 /*
1295 * If we have successfully processed data from a previous fetch
1296 * attempt, only fetch the data we don't already have.
1297 */
1298 if (prev_posn>0) {
1299 if (http_is_verbose)
1300 fprintf(stderr,
1301 "Resuming fetch of object %s at byte %ld\n",
1302 hex, prev_posn);
1303 sprintf(range, "Range: bytes=%ld-", prev_posn);
1304 range_header = curl_slist_append(range_header, range);
1305 curl_easy_setopt(freq->slot->curl,
1306 CURLOPT_HTTPHEADER, range_header);
1307 }
1308
1309 return freq;
1310
1311 abort:
1312 free(filename);
1313 free(freq->url);
1314 free(freq);
1315 return NULL;
1316 }
1317
1318 void process_http_object_request(struct http_object_request *freq)
1319 {
1320 if (freq->slot == NULL)
1321 return;
1322 freq->curl_result = freq->slot->curl_result;
1323 freq->http_code = freq->slot->http_code;
1324 freq->slot = NULL;
1325 }
1326
1327 int finish_http_object_request(struct http_object_request *freq)
1328 {
1329 struct stat st;
1330
1331 close(freq->localfile);
1332 freq->localfile = -1;
1333
1334 process_http_object_request(freq);
1335
1336 if (freq->http_code == 416) {
1337 warning("requested range invalid; we may already have all the data.");
1338 } else if (freq->curl_result != CURLE_OK) {
1339 if (stat(freq->tmpfile, &st) == 0)
1340 if (st.st_size == 0)
1341 unlink_or_warn(freq->tmpfile);
1342 return -1;
1343 }
1344
1345 git_inflate_end(&freq->stream);
1346 git_SHA1_Final(freq->real_sha1, &freq->c);
1347 if (freq->zret != Z_STREAM_END) {
1348 unlink_or_warn(freq->tmpfile);
1349 return -1;
1350 }
1351 if (hashcmp(freq->sha1, freq->real_sha1)) {
1352 unlink_or_warn(freq->tmpfile);
1353 return -1;
1354 }
1355 freq->rename =
1356 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1357
1358 return freq->rename;
1359 }
1360
1361 void abort_http_object_request(struct http_object_request *freq)
1362 {
1363 unlink_or_warn(freq->tmpfile);
1364
1365 release_http_object_request(freq);
1366 }
1367
1368 void release_http_object_request(struct http_object_request *freq)
1369 {
1370 if (freq->localfile != -1) {
1371 close(freq->localfile);
1372 freq->localfile = -1;
1373 }
1374 if (freq->url != NULL) {
1375 free(freq->url);
1376 freq->url = NULL;
1377 }
1378 if (freq->slot != NULL) {
1379 freq->slot->callback_func = NULL;
1380 freq->slot->callback_data = NULL;
1381 release_active_slot(freq->slot);
1382 freq->slot = NULL;
1383 }
1384 }
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