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gitweb: Add git_merge sub
[git/gsoc2010-gitweb.git] / http.c
blob1320c50e32eb7b8715b263bc2af089c3dbce39fa
1 #include "http.h"
2 #include "pack.h"
3 #include "sideband.h"
4 #include "run-command.h"
5
6 int data_received;
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 char *user_name, *user_pass;
44
45 #if LIBCURL_VERSION_NUM >= 0x071700
46 /* Use CURLOPT_KEYPASSWD as is */
47 #elif LIBCURL_VERSION_NUM >= 0x070903
48 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
49 #else
50 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
51 #endif
52
53 static char *ssl_cert_password;
54 static int ssl_cert_password_required;
55
56 static struct curl_slist *pragma_header;
57 static struct curl_slist *no_pragma_header;
58
59 static struct active_request_slot *active_queue_head;
60
61 size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
62 {
63 size_t size = eltsize * nmemb;
64 struct buffer *buffer = buffer_;
65
66 if (size > buffer->buf.len - buffer->posn)
67 size = buffer->buf.len - buffer->posn;
68 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
69 buffer->posn += size;
70
71 return size;
72 }
73
74 #ifndef NO_CURL_IOCTL
75 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
76 {
77 struct buffer *buffer = clientp;
78
79 switch (cmd) {
80 case CURLIOCMD_NOP:
81 return CURLIOE_OK;
82
83 case CURLIOCMD_RESTARTREAD:
84 buffer->posn = 0;
85 return CURLIOE_OK;
86
87 default:
88 return CURLIOE_UNKNOWNCMD;
89 }
90 }
91 #endif
92
93 size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
94 {
95 size_t size = eltsize * nmemb;
96 struct strbuf *buffer = buffer_;
97
98 strbuf_add(buffer, ptr, size);
99 data_received++;
100 return size;
101 }
102
103 size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
104 {
105 data_received++;
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 int http_options(const char *var, const char *value, void *cb)
140 {
141 if (!strcmp("http.sslverify", var)) {
142 curl_ssl_verify = git_config_bool(var, value);
143 return 0;
144 }
145 if (!strcmp("http.sslcert", var))
146 return git_config_string(&ssl_cert, var, value);
147 #if LIBCURL_VERSION_NUM >= 0x070903
148 if (!strcmp("http.sslkey", var))
149 return git_config_string(&ssl_key, var, value);
150 #endif
151 #if LIBCURL_VERSION_NUM >= 0x070908
152 if (!strcmp("http.sslcapath", var))
153 return git_config_string(&ssl_capath, var, value);
154 #endif
155 if (!strcmp("http.sslcainfo", var))
156 return git_config_string(&ssl_cainfo, var, value);
157 if (!strcmp("http.sslcertpasswordprotected", var)) {
158 if (git_config_bool(var, value))
159 ssl_cert_password_required = 1;
160 return 0;
161 }
162 if (!strcmp("http.minsessions", var)) {
163 min_curl_sessions = git_config_int(var, value);
164 #ifndef USE_CURL_MULTI
165 if (min_curl_sessions > 1)
166 min_curl_sessions = 1;
167 #endif
168 return 0;
169 }
170 #ifdef USE_CURL_MULTI
171 if (!strcmp("http.maxrequests", var)) {
172 max_requests = git_config_int(var, value);
173 return 0;
174 }
175 #endif
176 if (!strcmp("http.lowspeedlimit", var)) {
177 curl_low_speed_limit = (long)git_config_int(var, value);
178 return 0;
179 }
180 if (!strcmp("http.lowspeedtime", var)) {
181 curl_low_speed_time = (long)git_config_int(var, value);
182 return 0;
183 }
184
185 if (!strcmp("http.noepsv", var)) {
186 curl_ftp_no_epsv = git_config_bool(var, value);
187 return 0;
188 }
189 if (!strcmp("http.proxy", var))
190 return git_config_string(&curl_http_proxy, var, value);
191
192 if (!strcmp("http.postbuffer", var)) {
193 http_post_buffer = git_config_int(var, value);
194 if (http_post_buffer < LARGE_PACKET_MAX)
195 http_post_buffer = LARGE_PACKET_MAX;
196 return 0;
197 }
198
199 /* Fall back on the default ones */
200 return git_default_config(var, value, cb);
201 }
202
203 static void init_curl_http_auth(CURL *result)
204 {
205 if (user_name) {
206 struct strbuf up = STRBUF_INIT;
207 if (!user_pass)
208 user_pass = xstrdup(git_getpass("Password: "));
209 strbuf_addf(&up, "%s:%s", user_name, user_pass);
210 curl_easy_setopt(result, CURLOPT_USERPWD,
211 strbuf_detach(&up, NULL));
212 }
213 }
214
215 static int has_cert_password(void)
216 {
217 if (ssl_cert_password != NULL)
218 return 1;
219 if (ssl_cert == NULL || ssl_cert_password_required != 1)
220 return 0;
221 /* Only prompt the user once. */
222 ssl_cert_password_required = -1;
223 ssl_cert_password = git_getpass("Certificate Password: ");
224 if (ssl_cert_password != NULL) {
225 ssl_cert_password = xstrdup(ssl_cert_password);
226 return 1;
227 } else
228 return 0;
229 }
230
231 static CURL *get_curl_handle(void)
232 {
233 CURL *result = curl_easy_init();
234
235 if (!curl_ssl_verify) {
236 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
237 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
238 } else {
239 /* Verify authenticity of the peer's certificate */
240 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
241 /* The name in the cert must match whom we tried to connect */
242 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
243 }
244
245 #if LIBCURL_VERSION_NUM >= 0x070907
246 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
247 #endif
248 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
249 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
250 #endif
251
252 init_curl_http_auth(result);
253
254 if (ssl_cert != NULL)
255 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
256 if (has_cert_password())
257 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
258 #if LIBCURL_VERSION_NUM >= 0x070903
259 if (ssl_key != NULL)
260 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
261 #endif
262 #if LIBCURL_VERSION_NUM >= 0x070908
263 if (ssl_capath != NULL)
264 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
265 #endif
266 if (ssl_cainfo != NULL)
267 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
268 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
269
270 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
271 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
272 curl_low_speed_limit);
273 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
274 curl_low_speed_time);
275 }
276
277 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
278
279 if (getenv("GIT_CURL_VERBOSE"))
280 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
281
282 curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
283
284 if (curl_ftp_no_epsv)
285 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
286
287 if (curl_http_proxy)
288 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
289
290 return result;
291 }
292
293 static void http_auth_init(const char *url)
294 {
295 char *at, *colon, *cp, *slash;
296 int len;
297
298 cp = strstr(url, "://");
299 if (!cp)
300 return;
301
302 /*
303 * Ok, the URL looks like "proto://something". Which one?
304 * "proto://<user>:<pass>@<host>/...",
305 * "proto://<user>@<host>/...", or just
306 * "proto://<host>/..."?
307 */
308 cp += 3;
309 at = strchr(cp, '@');
310 colon = strchr(cp, ':');
311 slash = strchrnul(cp, '/');
312 if (!at || slash <= at)
313 return; /* No credentials */
314 if (!colon || at <= colon) {
315 /* Only username */
316 len = at - cp;
317 user_name = xmalloc(len + 1);
318 memcpy(user_name, cp, len);
319 user_name[len] = '\0';
320 user_pass = NULL;
321 } else {
322 len = colon - cp;
323 user_name = xmalloc(len + 1);
324 memcpy(user_name, cp, len);
325 user_name[len] = '\0';
326 len = at - (colon + 1);
327 user_pass = xmalloc(len + 1);
328 memcpy(user_pass, colon + 1, len);
329 user_pass[len] = '\0';
330 }
331 }
332
333 static void set_from_env(const char **var, const char *envname)
334 {
335 const char *val = getenv(envname);
336 if (val)
337 *var = val;
338 }
339
340 void http_init(struct remote *remote)
341 {
342 char *low_speed_limit;
343 char *low_speed_time;
344
345 http_is_verbose = 0;
346
347 git_config(http_options, NULL);
348
349 curl_global_init(CURL_GLOBAL_ALL);
350
351 if (remote && remote->http_proxy)
352 curl_http_proxy = xstrdup(remote->http_proxy);
353
354 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
355 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
356
357 #ifdef USE_CURL_MULTI
358 {
359 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
360 if (http_max_requests != NULL)
361 max_requests = atoi(http_max_requests);
362 }
363
364 curlm = curl_multi_init();
365 if (curlm == NULL) {
366 fprintf(stderr, "Error creating curl multi handle.\n");
367 exit(1);
368 }
369 #endif
370
371 if (getenv("GIT_SSL_NO_VERIFY"))
372 curl_ssl_verify = 0;
373
374 set_from_env(&ssl_cert, "GIT_SSL_CERT");
375 #if LIBCURL_VERSION_NUM >= 0x070903
376 set_from_env(&ssl_key, "GIT_SSL_KEY");
377 #endif
378 #if LIBCURL_VERSION_NUM >= 0x070908
379 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
380 #endif
381 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
382
383 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
384 if (low_speed_limit != NULL)
385 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
386 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
387 if (low_speed_time != NULL)
388 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
389
390 if (curl_ssl_verify == -1)
391 curl_ssl_verify = 1;
392
393 curl_session_count = 0;
394 #ifdef USE_CURL_MULTI
395 if (max_requests < 1)
396 max_requests = DEFAULT_MAX_REQUESTS;
397 #endif
398
399 if (getenv("GIT_CURL_FTP_NO_EPSV"))
400 curl_ftp_no_epsv = 1;
401
402 if (remote && remote->url && remote->url[0]) {
403 http_auth_init(remote->url[0]);
404 if (!ssl_cert_password_required &&
405 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
406 !prefixcmp(remote->url[0], "https://"))
407 ssl_cert_password_required = 1;
408 }
409
410 #ifndef NO_CURL_EASY_DUPHANDLE
411 curl_default = get_curl_handle();
412 #endif
413 }
414
415 void http_cleanup(void)
416 {
417 struct active_request_slot *slot = active_queue_head;
418
419 while (slot != NULL) {
420 struct active_request_slot *next = slot->next;
421 if (slot->curl != NULL) {
422 #ifdef USE_CURL_MULTI
423 curl_multi_remove_handle(curlm, slot->curl);
424 #endif
425 curl_easy_cleanup(slot->curl);
426 }
427 free(slot);
428 slot = next;
429 }
430 active_queue_head = NULL;
431
432 #ifndef NO_CURL_EASY_DUPHANDLE
433 curl_easy_cleanup(curl_default);
434 #endif
435
436 #ifdef USE_CURL_MULTI
437 curl_multi_cleanup(curlm);
438 #endif
439 curl_global_cleanup();
440
441 curl_slist_free_all(pragma_header);
442 pragma_header = NULL;
443
444 curl_slist_free_all(no_pragma_header);
445 no_pragma_header = NULL;
446
447 if (curl_http_proxy) {
448 free((void *)curl_http_proxy);
449 curl_http_proxy = NULL;
450 }
451
452 if (ssl_cert_password != NULL) {
453 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
454 free(ssl_cert_password);
455 ssl_cert_password = NULL;
456 }
457 ssl_cert_password_required = 0;
458 }
459
460 struct active_request_slot *get_active_slot(void)
461 {
462 struct active_request_slot *slot = active_queue_head;
463 struct active_request_slot *newslot;
464
465 #ifdef USE_CURL_MULTI
466 int num_transfers;
467
468 /* Wait for a slot to open up if the queue is full */
469 while (active_requests >= max_requests) {
470 curl_multi_perform(curlm, &num_transfers);
471 if (num_transfers < active_requests)
472 process_curl_messages();
473 }
474 #endif
475
476 while (slot != NULL && slot->in_use)
477 slot = slot->next;
478
479 if (slot == NULL) {
480 newslot = xmalloc(sizeof(*newslot));
481 newslot->curl = NULL;
482 newslot->in_use = 0;
483 newslot->next = NULL;
484
485 slot = active_queue_head;
486 if (slot == NULL) {
487 active_queue_head = newslot;
488 } else {
489 while (slot->next != NULL)
490 slot = slot->next;
491 slot->next = newslot;
492 }
493 slot = newslot;
494 }
495
496 if (slot->curl == NULL) {
497 #ifdef NO_CURL_EASY_DUPHANDLE
498 slot->curl = get_curl_handle();
499 #else
500 slot->curl = curl_easy_duphandle(curl_default);
501 #endif
502 curl_session_count++;
503 }
504
505 active_requests++;
506 slot->in_use = 1;
507 slot->local = NULL;
508 slot->results = NULL;
509 slot->finished = NULL;
510 slot->callback_data = NULL;
511 slot->callback_func = NULL;
512 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
513 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
514 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
515 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
516 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
517 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
518 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
519
520 return slot;
521 }
522
523 int start_active_slot(struct active_request_slot *slot)
524 {
525 #ifdef USE_CURL_MULTI
526 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
527 int num_transfers;
528
529 if (curlm_result != CURLM_OK &&
530 curlm_result != CURLM_CALL_MULTI_PERFORM) {
531 active_requests--;
532 slot->in_use = 0;
533 return 0;
534 }
535
536 /*
537 * We know there must be something to do, since we just added
538 * something.
539 */
540 curl_multi_perform(curlm, &num_transfers);
541 #endif
542 return 1;
543 }
544
545 #ifdef USE_CURL_MULTI
546 struct fill_chain {
547 void *data;
548 int (*fill)(void *);
549 struct fill_chain *next;
550 };
551
552 static struct fill_chain *fill_cfg;
553
554 void add_fill_function(void *data, int (*fill)(void *))
555 {
556 struct fill_chain *new = xmalloc(sizeof(*new));
557 struct fill_chain **linkp = &fill_cfg;
558 new->data = data;
559 new->fill = fill;
560 new->next = NULL;
561 while (*linkp)
562 linkp = &(*linkp)->next;
563 *linkp = new;
564 }
565
566 void fill_active_slots(void)
567 {
568 struct active_request_slot *slot = active_queue_head;
569
570 while (active_requests < max_requests) {
571 struct fill_chain *fill;
572 for (fill = fill_cfg; fill; fill = fill->next)
573 if (fill->fill(fill->data))
574 break;
575
576 if (!fill)
577 break;
578 }
579
580 while (slot != NULL) {
581 if (!slot->in_use && slot->curl != NULL
582 && curl_session_count > min_curl_sessions) {
583 curl_easy_cleanup(slot->curl);
584 slot->curl = NULL;
585 curl_session_count--;
586 }
587 slot = slot->next;
588 }
589 }
590
591 void step_active_slots(void)
592 {
593 int num_transfers;
594 CURLMcode curlm_result;
595
596 do {
597 curlm_result = curl_multi_perform(curlm, &num_transfers);
598 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
599 if (num_transfers < active_requests) {
600 process_curl_messages();
601 fill_active_slots();
602 }
603 }
604 #endif
605
606 void run_active_slot(struct active_request_slot *slot)
607 {
608 #ifdef USE_CURL_MULTI
609 long last_pos = 0;
610 long current_pos;
611 fd_set readfds;
612 fd_set writefds;
613 fd_set excfds;
614 int max_fd;
615 struct timeval select_timeout;
616 int finished = 0;
617
618 slot->finished = &finished;
619 while (!finished) {
620 data_received = 0;
621 step_active_slots();
622
623 if (!data_received && slot->local != NULL) {
624 current_pos = ftell(slot->local);
625 if (current_pos > last_pos)
626 data_received++;
627 last_pos = current_pos;
628 }
629
630 if (slot->in_use && !data_received) {
631 max_fd = 0;
632 FD_ZERO(&readfds);
633 FD_ZERO(&writefds);
634 FD_ZERO(&excfds);
635 select_timeout.tv_sec = 0;
636 select_timeout.tv_usec = 50000;
637 select(max_fd, &readfds, &writefds,
638 &excfds, &select_timeout);
639 }
640 }
641 #else
642 while (slot->in_use) {
643 slot->curl_result = curl_easy_perform(slot->curl);
644 finish_active_slot(slot);
645 }
646 #endif
647 }
648
649 static void closedown_active_slot(struct active_request_slot *slot)
650 {
651 active_requests--;
652 slot->in_use = 0;
653 }
654
655 static void release_active_slot(struct active_request_slot *slot)
656 {
657 closedown_active_slot(slot);
658 if (slot->curl && curl_session_count > min_curl_sessions) {
659 #ifdef USE_CURL_MULTI
660 curl_multi_remove_handle(curlm, slot->curl);
661 #endif
662 curl_easy_cleanup(slot->curl);
663 slot->curl = NULL;
664 curl_session_count--;
665 }
666 #ifdef USE_CURL_MULTI
667 fill_active_slots();
668 #endif
669 }
670
671 void finish_active_slot(struct active_request_slot *slot)
672 {
673 closedown_active_slot(slot);
674 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
675
676 if (slot->finished != NULL)
677 (*slot->finished) = 1;
678
679 /* Store slot results so they can be read after the slot is reused */
680 if (slot->results != NULL) {
681 slot->results->curl_result = slot->curl_result;
682 slot->results->http_code = slot->http_code;
683 }
684
685 /* Run callback if appropriate */
686 if (slot->callback_func != NULL)
687 slot->callback_func(slot->callback_data);
688 }
689
690 void finish_all_active_slots(void)
691 {
692 struct active_request_slot *slot = active_queue_head;
693
694 while (slot != NULL)
695 if (slot->in_use) {
696 run_active_slot(slot);
697 slot = active_queue_head;
698 } else {
699 slot = slot->next;
700 }
701 }
702
703 /* Helpers for modifying and creating URLs */
704 static inline int needs_quote(int ch)
705 {
706 if (((ch >= 'A') && (ch <= 'Z'))
707 || ((ch >= 'a') && (ch <= 'z'))
708 || ((ch >= '0') && (ch <= '9'))
709 || (ch == '/')
710 || (ch == '-')
711 || (ch == '.'))
712 return 0;
713 return 1;
714 }
715
716 static inline int hex(int v)
717 {
718 if (v < 10)
719 return '0' + v;
720 else
721 return 'A' + v - 10;
722 }
723
724 void end_url_with_slash(struct strbuf *buf, const char *url)
725 {
726 strbuf_addstr(buf, url);
727 if (buf->len && buf->buf[buf->len - 1] != '/')
728 strbuf_addstr(buf, "/");
729 }
730
731 static char *quote_ref_url(const char *base, const char *ref)
732 {
733 struct strbuf buf = STRBUF_INIT;
734 const char *cp;
735 int ch;
736
737 end_url_with_slash(&buf, base);
738
739 for (cp = ref; (ch = *cp) != 0; cp++)
740 if (needs_quote(ch))
741 strbuf_addf(&buf, "%%%02x", ch);
742 else
743 strbuf_addch(&buf, *cp);
744
745 return strbuf_detach(&buf, NULL);
746 }
747
748 void append_remote_object_url(struct strbuf *buf, const char *url,
749 const char *hex,
750 int only_two_digit_prefix)
751 {
752 end_url_with_slash(buf, url);
753
754 strbuf_addf(buf, "objects/%.*s/", 2, hex);
755 if (!only_two_digit_prefix)
756 strbuf_addf(buf, "%s", hex+2);
757 }
758
759 char *get_remote_object_url(const char *url, const char *hex,
760 int only_two_digit_prefix)
761 {
762 struct strbuf buf = STRBUF_INIT;
763 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
764 return strbuf_detach(&buf, NULL);
765 }
766
767 /* http_request() targets */
768 #define HTTP_REQUEST_STRBUF 0
769 #define HTTP_REQUEST_FILE 1
770
771 static int http_request(const char *url, void *result, int target, int options)
772 {
773 struct active_request_slot *slot;
774 struct slot_results results;
775 struct curl_slist *headers = NULL;
776 struct strbuf buf = STRBUF_INIT;
777 int ret;
778
779 slot = get_active_slot();
780 slot->results = &results;
781 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
782
783 if (result == NULL) {
784 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
785 } else {
786 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
787 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
788
789 if (target == HTTP_REQUEST_FILE) {
790 long posn = ftell(result);
791 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
792 fwrite);
793 if (posn > 0) {
794 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
795 headers = curl_slist_append(headers, buf.buf);
796 strbuf_reset(&buf);
797 }
798 slot->local = result;
799 } else
800 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
801 fwrite_buffer);
802 }
803
804 strbuf_addstr(&buf, "Pragma:");
805 if (options & HTTP_NO_CACHE)
806 strbuf_addstr(&buf, " no-cache");
807
808 headers = curl_slist_append(headers, buf.buf);
809
810 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
811 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
812
813 if (start_active_slot(slot)) {
814 run_active_slot(slot);
815 if (results.curl_result == CURLE_OK)
816 ret = HTTP_OK;
817 else if (missing_target(&results))
818 ret = HTTP_MISSING_TARGET;
819 else if (results.http_code == 401) {
820 if (user_name) {
821 ret = HTTP_NOAUTH;
822 } else {
823 /*
824 * git_getpass is needed here because its very likely stdin/stdout are
825 * pipes to our parent process. So we instead need to use /dev/tty,
826 * but that is non-portable. Using git_getpass() can at least be stubbed
827 * on other platforms with a different implementation if/when necessary.
828 */
829 user_name = xstrdup(git_getpass("Username: "));
830 init_curl_http_auth(slot->curl);
831 ret = HTTP_REAUTH;
832 }
833 } else
834 ret = HTTP_ERROR;
835 } else {
836 error("Unable to start HTTP request for %s", url);
837 ret = HTTP_START_FAILED;
838 }
839
840 slot->local = NULL;
841 curl_slist_free_all(headers);
842 strbuf_release(&buf);
843
844 return ret;
845 }
846
847 int http_get_strbuf(const char *url, struct strbuf *result, int options)
848 {
849 int http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
850 if (http_ret == HTTP_REAUTH) {
851 http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
852 }
853 return http_ret;
854 }
855
856 /*
857 * Downloads an url and stores the result in the given file.
858 *
859 * If a previous interrupted download is detected (i.e. a previous temporary
860 * file is still around) the download is resumed.
861 */
862 static int http_get_file(const char *url, const char *filename, int options)
863 {
864 int ret;
865 struct strbuf tmpfile = STRBUF_INIT;
866 FILE *result;
867
868 strbuf_addf(&tmpfile, "%s.temp", filename);
869 result = fopen(tmpfile.buf, "a");
870 if (! result) {
871 error("Unable to open local file %s", tmpfile.buf);
872 ret = HTTP_ERROR;
873 goto cleanup;
874 }
875
876 ret = http_request(url, result, HTTP_REQUEST_FILE, options);
877 fclose(result);
878
879 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
880 ret = HTTP_ERROR;
881 cleanup:
882 strbuf_release(&tmpfile);
883 return ret;
884 }
885
886 int http_error(const char *url, int ret)
887 {
888 /* http_request has already handled HTTP_START_FAILED. */
889 if (ret != HTTP_START_FAILED)
890 error("%s while accessing %s\n", curl_errorstr, url);
891
892 return ret;
893 }
894
895 int http_fetch_ref(const char *base, struct ref *ref)
896 {
897 char *url;
898 struct strbuf buffer = STRBUF_INIT;
899 int ret = -1;
900
901 url = quote_ref_url(base, ref->name);
902 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
903 strbuf_rtrim(&buffer);
904 if (buffer.len == 40)
905 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
906 else if (!prefixcmp(buffer.buf, "ref: ")) {
907 ref->symref = xstrdup(buffer.buf + 5);
908 ret = 0;
909 }
910 }
911
912 strbuf_release(&buffer);
913 free(url);
914 return ret;
915 }
916
917 /* Helpers for fetching packs */
918 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
919 {
920 char *url, *tmp;
921 struct strbuf buf = STRBUF_INIT;
922
923 if (http_is_verbose)
924 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
925
926 end_url_with_slash(&buf, base_url);
927 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
928 url = strbuf_detach(&buf, NULL);
929
930 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
931 tmp = strbuf_detach(&buf, NULL);
932
933 if (http_get_file(url, tmp, 0) != HTTP_OK) {
934 error("Unable to get pack index %s\n", url);
935 free(tmp);
936 tmp = NULL;
937 }
938
939 free(url);
940 return tmp;
941 }
942
943 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
944 unsigned char *sha1, const char *base_url)
945 {
946 struct packed_git *new_pack;
947 char *tmp_idx = NULL;
948 int ret;
949
950 if (has_pack_index(sha1)) {
951 new_pack = parse_pack_index(sha1, NULL);
952 if (!new_pack)
953 return -1; /* parse_pack_index() already issued error message */
954 goto add_pack;
955 }
956
957 tmp_idx = fetch_pack_index(sha1, base_url);
958 if (!tmp_idx)
959 return -1;
960
961 new_pack = parse_pack_index(sha1, tmp_idx);
962 if (!new_pack) {
963 unlink(tmp_idx);
964 free(tmp_idx);
965
966 return -1; /* parse_pack_index() already issued error message */
967 }
968
969 ret = verify_pack_index(new_pack);
970 if (!ret) {
971 close_pack_index(new_pack);
972 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
973 }
974 free(tmp_idx);
975 if (ret)
976 return -1;
977
978 add_pack:
979 new_pack->next = *packs_head;
980 *packs_head = new_pack;
981 return 0;
982 }
983
984 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
985 {
986 int ret = 0, i = 0;
987 char *url, *data;
988 struct strbuf buf = STRBUF_INIT;
989 unsigned char sha1[20];
990
991 end_url_with_slash(&buf, base_url);
992 strbuf_addstr(&buf, "objects/info/packs");
993 url = strbuf_detach(&buf, NULL);
994
995 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
996 if (ret != HTTP_OK)
997 goto cleanup;
998
999 data = buf.buf;
1000 while (i < buf.len) {
1001 switch (data[i]) {
1002 case 'P':
1003 i++;
1004 if (i + 52 <= buf.len &&
1005 !prefixcmp(data + i, " pack-") &&
1006 !prefixcmp(data + i + 46, ".pack\n")) {
1007 get_sha1_hex(data + i + 6, sha1);
1008 fetch_and_setup_pack_index(packs_head, sha1,
1009 base_url);
1010 i += 51;
1011 break;
1012 }
1013 default:
1014 while (i < buf.len && data[i] != '\n')
1015 i++;
1016 }
1017 i++;
1018 }
1019
1020 cleanup:
1021 free(url);
1022 return ret;
1023 }
1024
1025 void release_http_pack_request(struct http_pack_request *preq)
1026 {
1027 if (preq->packfile != NULL) {
1028 fclose(preq->packfile);
1029 preq->packfile = NULL;
1030 preq->slot->local = NULL;
1031 }
1032 if (preq->range_header != NULL) {
1033 curl_slist_free_all(preq->range_header);
1034 preq->range_header = NULL;
1035 }
1036 preq->slot = NULL;
1037 free(preq->url);
1038 }
1039
1040 int finish_http_pack_request(struct http_pack_request *preq)
1041 {
1042 struct packed_git **lst;
1043 struct packed_git *p = preq->target;
1044 char *tmp_idx;
1045 struct child_process ip;
1046 const char *ip_argv[8];
1047
1048 close_pack_index(p);
1049
1050 fclose(preq->packfile);
1051 preq->packfile = NULL;
1052 preq->slot->local = NULL;
1053
1054 lst = preq->lst;
1055 while (*lst != p)
1056 lst = &((*lst)->next);
1057 *lst = (*lst)->next;
1058
1059 tmp_idx = xstrdup(preq->tmpfile);
1060 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1061 ".idx.temp");
1062
1063 ip_argv[0] = "index-pack";
1064 ip_argv[1] = "-o";
1065 ip_argv[2] = tmp_idx;
1066 ip_argv[3] = preq->tmpfile;
1067 ip_argv[4] = NULL;
1068
1069 memset(&ip, 0, sizeof(ip));
1070 ip.argv = ip_argv;
1071 ip.git_cmd = 1;
1072 ip.no_stdin = 1;
1073 ip.no_stdout = 1;
1074
1075 if (run_command(&ip)) {
1076 unlink(preq->tmpfile);
1077 unlink(tmp_idx);
1078 free(tmp_idx);
1079 return -1;
1080 }
1081
1082 unlink(sha1_pack_index_name(p->sha1));
1083
1084 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1085 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1086 free(tmp_idx);
1087 return -1;
1088 }
1089
1090 install_packed_git(p);
1091 free(tmp_idx);
1092 return 0;
1093 }
1094
1095 struct http_pack_request *new_http_pack_request(
1096 struct packed_git *target, const char *base_url)
1097 {
1098 long prev_posn = 0;
1099 char range[RANGE_HEADER_SIZE];
1100 struct strbuf buf = STRBUF_INIT;
1101 struct http_pack_request *preq;
1102
1103 preq = xmalloc(sizeof(*preq));
1104 preq->target = target;
1105 preq->range_header = NULL;
1106
1107 end_url_with_slash(&buf, base_url);
1108 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1109 sha1_to_hex(target->sha1));
1110 preq->url = strbuf_detach(&buf, NULL);
1111
1112 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1113 sha1_pack_name(target->sha1));
1114 preq->packfile = fopen(preq->tmpfile, "a");
1115 if (!preq->packfile) {
1116 error("Unable to open local file %s for pack",
1117 preq->tmpfile);
1118 goto abort;
1119 }
1120
1121 preq->slot = get_active_slot();
1122 preq->slot->local = preq->packfile;
1123 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1124 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1125 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1126 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1127 no_pragma_header);
1128
1129 /*
1130 * If there is data present from a previous transfer attempt,
1131 * resume where it left off
1132 */
1133 prev_posn = ftell(preq->packfile);
1134 if (prev_posn>0) {
1135 if (http_is_verbose)
1136 fprintf(stderr,
1137 "Resuming fetch of pack %s at byte %ld\n",
1138 sha1_to_hex(target->sha1), prev_posn);
1139 sprintf(range, "Range: bytes=%ld-", prev_posn);
1140 preq->range_header = curl_slist_append(NULL, range);
1141 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1142 preq->range_header);
1143 }
1144
1145 return preq;
1146
1147 abort:
1148 free(preq->url);
1149 free(preq);
1150 return NULL;
1151 }
1152
1153 /* Helpers for fetching objects (loose) */
1154 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
1155 void *data)
1156 {
1157 unsigned char expn[4096];
1158 size_t size = eltsize * nmemb;
1159 int posn = 0;
1160 struct http_object_request *freq =
1161 (struct http_object_request *)data;
1162 do {
1163 ssize_t retval = xwrite(freq->localfile,
1164 (char *) ptr + posn, size - posn);
1165 if (retval < 0)
1166 return posn;
1167 posn += retval;
1168 } while (posn < size);
1169
1170 freq->stream.avail_in = size;
1171 freq->stream.next_in = ptr;
1172 do {
1173 freq->stream.next_out = expn;
1174 freq->stream.avail_out = sizeof(expn);
1175 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1176 git_SHA1_Update(&freq->c, expn,
1177 sizeof(expn) - freq->stream.avail_out);
1178 } while (freq->stream.avail_in && freq->zret == Z_OK);
1179 data_received++;
1180 return size;
1181 }
1182
1183 struct http_object_request *new_http_object_request(const char *base_url,
1184 unsigned char *sha1)
1185 {
1186 char *hex = sha1_to_hex(sha1);
1187 char *filename;
1188 char prevfile[PATH_MAX];
1189 int prevlocal;
1190 unsigned char prev_buf[PREV_BUF_SIZE];
1191 ssize_t prev_read = 0;
1192 long prev_posn = 0;
1193 char range[RANGE_HEADER_SIZE];
1194 struct curl_slist *range_header = NULL;
1195 struct http_object_request *freq;
1196
1197 freq = xmalloc(sizeof(*freq));
1198 hashcpy(freq->sha1, sha1);
1199 freq->localfile = -1;
1200
1201 filename = sha1_file_name(sha1);
1202 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1203 "%s.temp", filename);
1204
1205 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1206 unlink_or_warn(prevfile);
1207 rename(freq->tmpfile, prevfile);
1208 unlink_or_warn(freq->tmpfile);
1209
1210 if (freq->localfile != -1)
1211 error("fd leakage in start: %d", freq->localfile);
1212 freq->localfile = open(freq->tmpfile,
1213 O_WRONLY | O_CREAT | O_EXCL, 0666);
1214 /*
1215 * This could have failed due to the "lazy directory creation";
1216 * try to mkdir the last path component.
1217 */
1218 if (freq->localfile < 0 && errno == ENOENT) {
1219 char *dir = strrchr(freq->tmpfile, '/');
1220 if (dir) {
1221 *dir = 0;
1222 mkdir(freq->tmpfile, 0777);
1223 *dir = '/';
1224 }
1225 freq->localfile = open(freq->tmpfile,
1226 O_WRONLY | O_CREAT | O_EXCL, 0666);
1227 }
1228
1229 if (freq->localfile < 0) {
1230 error("Couldn't create temporary file %s: %s",
1231 freq->tmpfile, strerror(errno));
1232 goto abort;
1233 }
1234
1235 memset(&freq->stream, 0, sizeof(freq->stream));
1236
1237 git_inflate_init(&freq->stream);
1238
1239 git_SHA1_Init(&freq->c);
1240
1241 freq->url = get_remote_object_url(base_url, hex, 0);
1242
1243 /*
1244 * If a previous temp file is present, process what was already
1245 * fetched.
1246 */
1247 prevlocal = open(prevfile, O_RDONLY);
1248 if (prevlocal != -1) {
1249 do {
1250 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1251 if (prev_read>0) {
1252 if (fwrite_sha1_file(prev_buf,
1253 1,
1254 prev_read,
1255 freq) == prev_read) {
1256 prev_posn += prev_read;
1257 } else {
1258 prev_read = -1;
1259 }
1260 }
1261 } while (prev_read > 0);
1262 close(prevlocal);
1263 }
1264 unlink_or_warn(prevfile);
1265
1266 /*
1267 * Reset inflate/SHA1 if there was an error reading the previous temp
1268 * file; also rewind to the beginning of the local file.
1269 */
1270 if (prev_read == -1) {
1271 memset(&freq->stream, 0, sizeof(freq->stream));
1272 git_inflate_init(&freq->stream);
1273 git_SHA1_Init(&freq->c);
1274 if (prev_posn>0) {
1275 prev_posn = 0;
1276 lseek(freq->localfile, 0, SEEK_SET);
1277 if (ftruncate(freq->localfile, 0) < 0) {
1278 error("Couldn't truncate temporary file %s: %s",
1279 freq->tmpfile, strerror(errno));
1280 goto abort;
1281 }
1282 }
1283 }
1284
1285 freq->slot = get_active_slot();
1286
1287 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1288 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1289 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1290 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1291 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1292
1293 /*
1294 * If we have successfully processed data from a previous fetch
1295 * attempt, only fetch the data we don't already have.
1296 */
1297 if (prev_posn>0) {
1298 if (http_is_verbose)
1299 fprintf(stderr,
1300 "Resuming fetch of object %s at byte %ld\n",
1301 hex, prev_posn);
1302 sprintf(range, "Range: bytes=%ld-", prev_posn);
1303 range_header = curl_slist_append(range_header, range);
1304 curl_easy_setopt(freq->slot->curl,
1305 CURLOPT_HTTPHEADER, range_header);
1306 }
1307
1308 return freq;
1309
1310 abort:
1311 free(filename);
1312 free(freq->url);
1313 free(freq);
1314 return NULL;
1315 }
1316
1317 void process_http_object_request(struct http_object_request *freq)
1318 {
1319 if (freq->slot == NULL)
1320 return;
1321 freq->curl_result = freq->slot->curl_result;
1322 freq->http_code = freq->slot->http_code;
1323 freq->slot = NULL;
1324 }
1325
1326 int finish_http_object_request(struct http_object_request *freq)
1327 {
1328 struct stat st;
1329
1330 close(freq->localfile);
1331 freq->localfile = -1;
1332
1333 process_http_object_request(freq);
1334
1335 if (freq->http_code == 416) {
1336 warning("requested range invalid; we may already have all the data.");
1337 } else if (freq->curl_result != CURLE_OK) {
1338 if (stat(freq->tmpfile, &st) == 0)
1339 if (st.st_size == 0)
1340 unlink_or_warn(freq->tmpfile);
1341 return -1;
1342 }
1343
1344 git_inflate_end(&freq->stream);
1345 git_SHA1_Final(freq->real_sha1, &freq->c);
1346 if (freq->zret != Z_STREAM_END) {
1347 unlink_or_warn(freq->tmpfile);
1348 return -1;
1349 }
1350 if (hashcmp(freq->sha1, freq->real_sha1)) {
1351 unlink_or_warn(freq->tmpfile);
1352 return -1;
1353 }
1354 freq->rename =
1355 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1356
1357 return freq->rename;
1358 }
1359
1360 void abort_http_object_request(struct http_object_request *freq)
1361 {
1362 unlink_or_warn(freq->tmpfile);
1363
1364 release_http_object_request(freq);
1365 }
1366
1367 void release_http_object_request(struct http_object_request *freq)
1368 {
1369 if (freq->localfile != -1) {
1370 close(freq->localfile);
1371 freq->localfile = -1;
1372 }
1373 if (freq->url != NULL) {
1374 free(freq->url);
1375 freq->url = NULL;
1376 }
1377 if (freq->slot != NULL) {
1378 freq->slot->callback_func = NULL;
1379 freq->slot->callback_data = NULL;
1380 release_active_slot(freq->slot);
1381 freq->slot = NULL;
1382 }
1383 }
Gitweb fork for GSoC 2010