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Gitweb: add support for Alex Gorbatchev's SyntaxHighlighter in Javascript
[git/dscho.git] / http.c
bloba51cf3d119063ef3fa27eefdb76233d8bd804e3c
1 #include "http.h"
2 #include "pack.h"
3 #include "sideband.h"
4 #include "run-command.h"
5 #include "url.h"
6 #include "credential.h"
7 #include "exec_cmd.h"
8
9 int active_requests;
10 int http_is_verbose;
11 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
12
13 #if LIBCURL_VERSION_NUM >= 0x070a06
14 #define LIBCURL_CAN_HANDLE_AUTH_ANY
15 #endif
16
17 static int min_curl_sessions = 1;
18 static int curl_session_count;
19 #ifdef USE_CURL_MULTI
20 static int max_requests = -1;
21 static CURLM *curlm;
22 #endif
23 #ifndef NO_CURL_EASY_DUPHANDLE
24 static CURL *curl_default;
25 #endif
26
27 #define PREV_BUF_SIZE 4096
28 #define RANGE_HEADER_SIZE 30
29
30 char curl_errorstr[CURL_ERROR_SIZE];
31
32 static int curl_ssl_verify = -1;
33 static const char *ssl_cert;
34 #if LIBCURL_VERSION_NUM >= 0x070903
35 static const char *ssl_key;
36 #endif
37 #if LIBCURL_VERSION_NUM >= 0x070908
38 static const char *ssl_capath;
39 #endif
40 static const char *ssl_cainfo;
41 static long curl_low_speed_limit = -1;
42 static long curl_low_speed_time = -1;
43 static int curl_ftp_no_epsv;
44 static const char *curl_http_proxy;
45 static const char *curl_cookie_file;
46 static struct credential http_auth = CREDENTIAL_INIT;
47 static int http_proactive_auth;
48 static const char *user_agent;
49
50 #if LIBCURL_VERSION_NUM >= 0x071700
51 /* Use CURLOPT_KEYPASSWD as is */
52 #elif LIBCURL_VERSION_NUM >= 0x070903
53 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
54 #else
55 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
56 #endif
57
58 static struct credential cert_auth = CREDENTIAL_INIT;
59 static int ssl_cert_password_required;
60
61 static struct curl_slist *pragma_header;
62 static struct curl_slist *no_pragma_header;
63
64 static struct active_request_slot *active_queue_head;
65
66 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
67 {
68 size_t size = eltsize * nmemb;
69 struct buffer *buffer = buffer_;
70
71 if (size > buffer->buf.len - buffer->posn)
72 size = buffer->buf.len - buffer->posn;
73 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
74 buffer->posn += size;
75
76 return size;
77 }
78
79 #ifndef NO_CURL_IOCTL
80 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
81 {
82 struct buffer *buffer = clientp;
83
84 switch (cmd) {
85 case CURLIOCMD_NOP:
86 return CURLIOE_OK;
87
88 case CURLIOCMD_RESTARTREAD:
89 buffer->posn = 0;
90 return CURLIOE_OK;
91
92 default:
93 return CURLIOE_UNKNOWNCMD;
94 }
95 }
96 #endif
97
98 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
99 {
100 size_t size = eltsize * nmemb;
101 struct strbuf *buffer = buffer_;
102
103 strbuf_add(buffer, ptr, size);
104 return size;
105 }
106
107 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
108 {
109 return eltsize * nmemb;
110 }
111
112 #ifdef USE_CURL_MULTI
113 static void process_curl_messages(void)
114 {
115 int num_messages;
116 struct active_request_slot *slot;
117 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
118
119 while (curl_message != NULL) {
120 if (curl_message->msg == CURLMSG_DONE) {
121 int curl_result = curl_message->data.result;
122 slot = active_queue_head;
123 while (slot != NULL &&
124 slot->curl != curl_message->easy_handle)
125 slot = slot->next;
126 if (slot != NULL) {
127 curl_multi_remove_handle(curlm, slot->curl);
128 slot->curl_result = curl_result;
129 finish_active_slot(slot);
130 } else {
131 fprintf(stderr, "Received DONE message for unknown request!\n");
132 }
133 } else {
134 fprintf(stderr, "Unknown CURL message received: %d\n",
135 (int)curl_message->msg);
136 }
137 curl_message = curl_multi_info_read(curlm, &num_messages);
138 }
139 }
140 #endif
141
142 static int git_config_path(const char **result,
143 const char *var, const char *value)
144 {
145 if (git_config_string(result, var, value))
146 return 1;
147 #ifdef __MINGW32__
148 if (**result == '/')
149 *result = system_path((*result) + 1);
150 #endif
151 return 0;
152 }
153
154 static int http_options(const char *var, const char *value, void *cb)
155 {
156 if (!strcmp("http.sslverify", var)) {
157 curl_ssl_verify = git_config_bool(var, value);
158 return 0;
159 }
160 if (!strcmp("http.sslcert", var))
161 return git_config_path(&ssl_cert, var, value);
162 #if LIBCURL_VERSION_NUM >= 0x070903
163 if (!strcmp("http.sslkey", var))
164 return git_config_path(&ssl_key, var, value);
165 #endif
166 #if LIBCURL_VERSION_NUM >= 0x070908
167 if (!strcmp("http.sslcapath", var))
168 return git_config_path(&ssl_capath, var, value);
169 #endif
170 if (!strcmp("http.sslcainfo", var))
171 return git_config_path(&ssl_cainfo, var, value);
172 if (!strcmp("http.sslcertpasswordprotected", var)) {
173 if (git_config_bool(var, value))
174 ssl_cert_password_required = 1;
175 return 0;
176 }
177 if (!strcmp("http.minsessions", var)) {
178 min_curl_sessions = git_config_int(var, value);
179 #ifndef USE_CURL_MULTI
180 if (min_curl_sessions > 1)
181 min_curl_sessions = 1;
182 #endif
183 return 0;
184 }
185 #ifdef USE_CURL_MULTI
186 if (!strcmp("http.maxrequests", var)) {
187 max_requests = git_config_int(var, value);
188 return 0;
189 }
190 #endif
191 if (!strcmp("http.lowspeedlimit", var)) {
192 curl_low_speed_limit = (long)git_config_int(var, value);
193 return 0;
194 }
195 if (!strcmp("http.lowspeedtime", var)) {
196 curl_low_speed_time = (long)git_config_int(var, value);
197 return 0;
198 }
199
200 if (!strcmp("http.noepsv", var)) {
201 curl_ftp_no_epsv = git_config_bool(var, value);
202 return 0;
203 }
204 if (!strcmp("http.proxy", var))
205 return git_config_string(&curl_http_proxy, var, value);
206
207 if (!strcmp("http.cookiefile", var))
208 return git_config_string(&curl_cookie_file, var, value);
209
210 if (!strcmp("http.postbuffer", var)) {
211 http_post_buffer = git_config_int(var, value);
212 if (http_post_buffer < LARGE_PACKET_MAX)
213 http_post_buffer = LARGE_PACKET_MAX;
214 return 0;
215 }
216
217 if (!strcmp("http.useragent", var))
218 return git_config_string(&user_agent, var, value);
219
220 /* Fall back on the default ones */
221 return git_default_config(var, value, cb);
222 }
223
224 static void init_curl_http_auth(CURL *result)
225 {
226 if (http_auth.username) {
227 struct strbuf up = STRBUF_INIT;
228 credential_fill(&http_auth);
229 strbuf_addf(&up, "%s:%s",
230 http_auth.username, http_auth.password);
231 curl_easy_setopt(result, CURLOPT_USERPWD,
232 strbuf_detach(&up, NULL));
233 }
234 }
235
236 static int has_cert_password(void)
237 {
238 if (ssl_cert == NULL || ssl_cert_password_required != 1)
239 return 0;
240 if (!cert_auth.password) {
241 cert_auth.protocol = xstrdup("cert");
242 cert_auth.path = xstrdup(ssl_cert);
243 credential_fill(&cert_auth);
244 }
245 return 1;
246 }
247
248 static CURL *get_curl_handle(void)
249 {
250 CURL *result = curl_easy_init();
251
252 if (!curl_ssl_verify) {
253 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
254 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
255 } else {
256 /* Verify authenticity of the peer's certificate */
257 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
258 /* The name in the cert must match whom we tried to connect */
259 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
260 }
261
262 #if LIBCURL_VERSION_NUM >= 0x070907
263 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
264 #endif
265 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
266 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
267 #endif
268
269 if (http_proactive_auth)
270 init_curl_http_auth(result);
271
272 if (ssl_cert != NULL)
273 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
274 if (has_cert_password())
275 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
276 #if LIBCURL_VERSION_NUM >= 0x070903
277 if (ssl_key != NULL)
278 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
279 #endif
280 #if LIBCURL_VERSION_NUM >= 0x070908
281 if (ssl_capath != NULL)
282 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
283 #endif
284 if (ssl_cainfo != NULL)
285 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
286 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
287
288 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
289 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
290 curl_low_speed_limit);
291 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
292 curl_low_speed_time);
293 }
294
295 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
296 #if LIBCURL_VERSION_NUM >= 0x071301
297 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
298 #elif LIBCURL_VERSION_NUM >= 0x071101
299 curl_easy_setopt(result, CURLOPT_POST301, 1);
300 #endif
301
302 if (getenv("GIT_CURL_VERBOSE"))
303 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
304
305 curl_easy_setopt(result, CURLOPT_USERAGENT,
306 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
307
308 if (curl_ftp_no_epsv)
309 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
310
311 if (curl_http_proxy) {
312 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
313 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
314 }
315
316 return result;
317 }
318
319 static void set_from_env(const char **var, const char *envname)
320 {
321 const char *val = getenv(envname);
322 if (val)
323 *var = val;
324 }
325
326 void http_init(struct remote *remote, const char *url, int proactive_auth)
327 {
328 char *low_speed_limit;
329 char *low_speed_time;
330
331 http_is_verbose = 0;
332
333 git_config(http_options, NULL);
334
335 curl_global_init(CURL_GLOBAL_ALL);
336
337 http_proactive_auth = proactive_auth;
338
339 if (remote && remote->http_proxy)
340 curl_http_proxy = xstrdup(remote->http_proxy);
341
342 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
343 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
344
345 #ifdef USE_CURL_MULTI
346 {
347 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
348 if (http_max_requests != NULL)
349 max_requests = atoi(http_max_requests);
350 }
351
352 curlm = curl_multi_init();
353 if (curlm == NULL) {
354 fprintf(stderr, "Error creating curl multi handle.\n");
355 exit(1);
356 }
357 #endif
358
359 if (getenv("GIT_SSL_NO_VERIFY"))
360 curl_ssl_verify = 0;
361
362 set_from_env(&ssl_cert, "GIT_SSL_CERT");
363 #if LIBCURL_VERSION_NUM >= 0x070903
364 set_from_env(&ssl_key, "GIT_SSL_KEY");
365 #endif
366 #if LIBCURL_VERSION_NUM >= 0x070908
367 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
368 #endif
369 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
370
371 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
372
373 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
374 if (low_speed_limit != NULL)
375 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
376 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
377 if (low_speed_time != NULL)
378 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
379
380 if (curl_ssl_verify == -1)
381 curl_ssl_verify = 1;
382
383 curl_session_count = 0;
384 #ifdef USE_CURL_MULTI
385 if (max_requests < 1)
386 max_requests = DEFAULT_MAX_REQUESTS;
387 #endif
388
389 if (getenv("GIT_CURL_FTP_NO_EPSV"))
390 curl_ftp_no_epsv = 1;
391
392 if (url) {
393 credential_from_url(&http_auth, url);
394 if (!ssl_cert_password_required &&
395 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
396 !prefixcmp(url, "https://"))
397 ssl_cert_password_required = 1;
398 }
399
400 #ifndef NO_CURL_EASY_DUPHANDLE
401 curl_default = get_curl_handle();
402 #endif
403 }
404
405 void http_cleanup(void)
406 {
407 struct active_request_slot *slot = active_queue_head;
408
409 while (slot != NULL) {
410 struct active_request_slot *next = slot->next;
411 if (slot->curl != NULL) {
412 #ifdef USE_CURL_MULTI
413 curl_multi_remove_handle(curlm, slot->curl);
414 #endif
415 curl_easy_cleanup(slot->curl);
416 }
417 free(slot);
418 slot = next;
419 }
420 active_queue_head = NULL;
421
422 #ifndef NO_CURL_EASY_DUPHANDLE
423 curl_easy_cleanup(curl_default);
424 #endif
425
426 #ifdef USE_CURL_MULTI
427 curl_multi_cleanup(curlm);
428 #endif
429 curl_global_cleanup();
430
431 curl_slist_free_all(pragma_header);
432 pragma_header = NULL;
433
434 curl_slist_free_all(no_pragma_header);
435 no_pragma_header = NULL;
436
437 if (curl_http_proxy) {
438 free((void *)curl_http_proxy);
439 curl_http_proxy = NULL;
440 }
441
442 if (cert_auth.password != NULL) {
443 memset(cert_auth.password, 0, strlen(cert_auth.password));
444 free(cert_auth.password);
445 cert_auth.password = NULL;
446 }
447 ssl_cert_password_required = 0;
448 }
449
450 struct active_request_slot *get_active_slot(void)
451 {
452 struct active_request_slot *slot = active_queue_head;
453 struct active_request_slot *newslot;
454
455 #ifdef USE_CURL_MULTI
456 int num_transfers;
457
458 /* Wait for a slot to open up if the queue is full */
459 while (active_requests >= max_requests) {
460 curl_multi_perform(curlm, &num_transfers);
461 if (num_transfers < active_requests)
462 process_curl_messages();
463 }
464 #endif
465
466 while (slot != NULL && slot->in_use)
467 slot = slot->next;
468
469 if (slot == NULL) {
470 newslot = xmalloc(sizeof(*newslot));
471 newslot->curl = NULL;
472 newslot->in_use = 0;
473 newslot->next = NULL;
474
475 slot = active_queue_head;
476 if (slot == NULL) {
477 active_queue_head = newslot;
478 } else {
479 while (slot->next != NULL)
480 slot = slot->next;
481 slot->next = newslot;
482 }
483 slot = newslot;
484 }
485
486 if (slot->curl == NULL) {
487 #ifdef NO_CURL_EASY_DUPHANDLE
488 slot->curl = get_curl_handle();
489 #else
490 slot->curl = curl_easy_duphandle(curl_default);
491 #endif
492 curl_session_count++;
493 }
494
495 active_requests++;
496 slot->in_use = 1;
497 slot->results = NULL;
498 slot->finished = NULL;
499 slot->callback_data = NULL;
500 slot->callback_func = NULL;
501 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
502 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
503 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
504 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
505 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
506 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
507 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
508 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
509 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
510
511 return slot;
512 }
513
514 int start_active_slot(struct active_request_slot *slot)
515 {
516 #ifdef USE_CURL_MULTI
517 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
518 int num_transfers;
519
520 if (curlm_result != CURLM_OK &&
521 curlm_result != CURLM_CALL_MULTI_PERFORM) {
522 active_requests--;
523 slot->in_use = 0;
524 return 0;
525 }
526
527 /*
528 * We know there must be something to do, since we just added
529 * something.
530 */
531 curl_multi_perform(curlm, &num_transfers);
532 #endif
533 return 1;
534 }
535
536 #ifdef USE_CURL_MULTI
537 struct fill_chain {
538 void *data;
539 int (*fill)(void *);
540 struct fill_chain *next;
541 };
542
543 static struct fill_chain *fill_cfg;
544
545 void add_fill_function(void *data, int (*fill)(void *))
546 {
547 struct fill_chain *new = xmalloc(sizeof(*new));
548 struct fill_chain **linkp = &fill_cfg;
549 new->data = data;
550 new->fill = fill;
551 new->next = NULL;
552 while (*linkp)
553 linkp = &(*linkp)->next;
554 *linkp = new;
555 }
556
557 void fill_active_slots(void)
558 {
559 struct active_request_slot *slot = active_queue_head;
560
561 while (active_requests < max_requests) {
562 struct fill_chain *fill;
563 for (fill = fill_cfg; fill; fill = fill->next)
564 if (fill->fill(fill->data))
565 break;
566
567 if (!fill)
568 break;
569 }
570
571 while (slot != NULL) {
572 if (!slot->in_use && slot->curl != NULL
573 && curl_session_count > min_curl_sessions) {
574 curl_easy_cleanup(slot->curl);
575 slot->curl = NULL;
576 curl_session_count--;
577 }
578 slot = slot->next;
579 }
580 }
581
582 void step_active_slots(void)
583 {
584 int num_transfers;
585 CURLMcode curlm_result;
586
587 do {
588 curlm_result = curl_multi_perform(curlm, &num_transfers);
589 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
590 if (num_transfers < active_requests) {
591 process_curl_messages();
592 fill_active_slots();
593 }
594 }
595 #endif
596
597 void run_active_slot(struct active_request_slot *slot)
598 {
599 #ifdef USE_CURL_MULTI
600 fd_set readfds;
601 fd_set writefds;
602 fd_set excfds;
603 int max_fd;
604 struct timeval select_timeout;
605 int finished = 0;
606
607 slot->finished = &finished;
608 while (!finished) {
609 step_active_slots();
610
611 if (slot->in_use) {
612 #if LIBCURL_VERSION_NUM >= 0x070f04
613 long curl_timeout;
614 curl_multi_timeout(curlm, &curl_timeout);
615 if (curl_timeout == 0) {
616 continue;
617 } else if (curl_timeout == -1) {
618 select_timeout.tv_sec = 0;
619 select_timeout.tv_usec = 50000;
620 } else {
621 select_timeout.tv_sec = curl_timeout / 1000;
622 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
623 }
624 #else
625 select_timeout.tv_sec = 0;
626 select_timeout.tv_usec = 50000;
627 #endif
628
629 max_fd = -1;
630 FD_ZERO(&readfds);
631 FD_ZERO(&writefds);
632 FD_ZERO(&excfds);
633 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
634
635 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
636 }
637 }
638 #else
639 while (slot->in_use) {
640 slot->curl_result = curl_easy_perform(slot->curl);
641 finish_active_slot(slot);
642 }
643 #endif
644 }
645
646 static void closedown_active_slot(struct active_request_slot *slot)
647 {
648 active_requests--;
649 slot->in_use = 0;
650 }
651
652 static void release_active_slot(struct active_request_slot *slot)
653 {
654 closedown_active_slot(slot);
655 if (slot->curl && curl_session_count > min_curl_sessions) {
656 #ifdef USE_CURL_MULTI
657 curl_multi_remove_handle(curlm, slot->curl);
658 #endif
659 curl_easy_cleanup(slot->curl);
660 slot->curl = NULL;
661 curl_session_count--;
662 }
663 #ifdef USE_CURL_MULTI
664 fill_active_slots();
665 #endif
666 }
667
668 void finish_active_slot(struct active_request_slot *slot)
669 {
670 closedown_active_slot(slot);
671 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
672
673 if (slot->finished != NULL)
674 (*slot->finished) = 1;
675
676 /* Store slot results so they can be read after the slot is reused */
677 if (slot->results != NULL) {
678 slot->results->curl_result = slot->curl_result;
679 slot->results->http_code = slot->http_code;
680 }
681
682 /* Run callback if appropriate */
683 if (slot->callback_func != NULL)
684 slot->callback_func(slot->callback_data);
685 }
686
687 void finish_all_active_slots(void)
688 {
689 struct active_request_slot *slot = active_queue_head;
690
691 while (slot != NULL)
692 if (slot->in_use) {
693 run_active_slot(slot);
694 slot = active_queue_head;
695 } else {
696 slot = slot->next;
697 }
698 }
699
700 /* Helpers for modifying and creating URLs */
701 static inline int needs_quote(int ch)
702 {
703 if (((ch >= 'A') && (ch <= 'Z'))
704 || ((ch >= 'a') && (ch <= 'z'))
705 || ((ch >= '0') && (ch <= '9'))
706 || (ch == '/')
707 || (ch == '-')
708 || (ch == '.'))
709 return 0;
710 return 1;
711 }
712
713 static char *quote_ref_url(const char *base, const char *ref)
714 {
715 struct strbuf buf = STRBUF_INIT;
716 const char *cp;
717 int ch;
718
719 end_url_with_slash(&buf, base);
720
721 for (cp = ref; (ch = *cp) != 0; cp++)
722 if (needs_quote(ch))
723 strbuf_addf(&buf, "%%%02x", ch);
724 else
725 strbuf_addch(&buf, *cp);
726
727 return strbuf_detach(&buf, NULL);
728 }
729
730 void append_remote_object_url(struct strbuf *buf, const char *url,
731 const char *hex,
732 int only_two_digit_prefix)
733 {
734 end_url_with_slash(buf, url);
735
736 strbuf_addf(buf, "objects/%.*s/", 2, hex);
737 if (!only_two_digit_prefix)
738 strbuf_addf(buf, "%s", hex+2);
739 }
740
741 char *get_remote_object_url(const char *url, const char *hex,
742 int only_two_digit_prefix)
743 {
744 struct strbuf buf = STRBUF_INIT;
745 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
746 return strbuf_detach(&buf, NULL);
747 }
748
749 /* http_request() targets */
750 #define HTTP_REQUEST_STRBUF 0
751 #define HTTP_REQUEST_FILE 1
752
753 static int http_request(const char *url, void *result, int target, int options)
754 {
755 struct active_request_slot *slot;
756 struct slot_results results;
757 struct curl_slist *headers = NULL;
758 struct strbuf buf = STRBUF_INIT;
759 int ret;
760
761 slot = get_active_slot();
762 slot->results = &results;
763 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
764
765 if (result == NULL) {
766 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
767 } else {
768 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
769 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
770
771 if (target == HTTP_REQUEST_FILE) {
772 long posn = ftell(result);
773 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
774 fwrite);
775 if (posn > 0) {
776 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
777 headers = curl_slist_append(headers, buf.buf);
778 strbuf_reset(&buf);
779 }
780 } else
781 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
782 fwrite_buffer);
783 }
784
785 strbuf_addstr(&buf, "Pragma:");
786 if (options & HTTP_NO_CACHE)
787 strbuf_addstr(&buf, " no-cache");
788
789 headers = curl_slist_append(headers, buf.buf);
790
791 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
792 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
793
794 if (start_active_slot(slot)) {
795 run_active_slot(slot);
796 if (results.curl_result == CURLE_OK)
797 ret = HTTP_OK;
798 else if (missing_target(&results))
799 ret = HTTP_MISSING_TARGET;
800 else if (results.http_code == 401) {
801 if (http_auth.username && http_auth.password) {
802 credential_reject(&http_auth);
803 ret = HTTP_NOAUTH;
804 } else {
805 credential_fill(&http_auth);
806 init_curl_http_auth(slot->curl);
807 ret = HTTP_REAUTH;
808 }
809 } else {
810 if (!curl_errorstr[0])
811 strlcpy(curl_errorstr,
812 curl_easy_strerror(results.curl_result),
813 sizeof(curl_errorstr));
814 ret = HTTP_ERROR;
815 }
816 } else {
817 error("Unable to start HTTP request for %s", url);
818 ret = HTTP_START_FAILED;
819 }
820
821 curl_slist_free_all(headers);
822 strbuf_release(&buf);
823
824 if (ret == HTTP_OK)
825 credential_approve(&http_auth);
826
827 return ret;
828 }
829
830 static int http_request_reauth(const char *url, void *result, int target,
831 int options)
832 {
833 int ret = http_request(url, result, target, options);
834 if (ret != HTTP_REAUTH)
835 return ret;
836 return http_request(url, result, target, options);
837 }
838
839 int http_get_strbuf(const char *url, struct strbuf *result, int options)
840 {
841 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
842 }
843
844 /*
845 * Downloads an url and stores the result in the given file.
846 *
847 * If a previous interrupted download is detected (i.e. a previous temporary
848 * file is still around) the download is resumed.
849 */
850 static int http_get_file(const char *url, const char *filename, int options)
851 {
852 int ret;
853 struct strbuf tmpfile = STRBUF_INIT;
854 FILE *result;
855
856 strbuf_addf(&tmpfile, "%s.temp", filename);
857 result = fopen(tmpfile.buf, "a");
858 if (! result) {
859 error("Unable to open local file %s", tmpfile.buf);
860 ret = HTTP_ERROR;
861 goto cleanup;
862 }
863
864 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
865 fclose(result);
866
867 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
868 ret = HTTP_ERROR;
869 cleanup:
870 strbuf_release(&tmpfile);
871 return ret;
872 }
873
874 int http_error(const char *url, int ret)
875 {
876 /* http_request has already handled HTTP_START_FAILED. */
877 if (ret != HTTP_START_FAILED)
878 error("%s while accessing %s", curl_errorstr, url);
879
880 return ret;
881 }
882
883 int http_fetch_ref(const char *base, struct ref *ref)
884 {
885 char *url;
886 struct strbuf buffer = STRBUF_INIT;
887 int ret = -1;
888
889 url = quote_ref_url(base, ref->name);
890 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
891 strbuf_rtrim(&buffer);
892 if (buffer.len == 40)
893 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
894 else if (!prefixcmp(buffer.buf, "ref: ")) {
895 ref->symref = xstrdup(buffer.buf + 5);
896 ret = 0;
897 }
898 }
899
900 strbuf_release(&buffer);
901 free(url);
902 return ret;
903 }
904
905 /* Helpers for fetching packs */
906 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
907 {
908 char *url, *tmp;
909 struct strbuf buf = STRBUF_INIT;
910
911 if (http_is_verbose)
912 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
913
914 end_url_with_slash(&buf, base_url);
915 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
916 url = strbuf_detach(&buf, NULL);
917
918 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
919 tmp = strbuf_detach(&buf, NULL);
920
921 if (http_get_file(url, tmp, 0) != HTTP_OK) {
922 error("Unable to get pack index %s\n", url);
923 free(tmp);
924 tmp = NULL;
925 }
926
927 free(url);
928 return tmp;
929 }
930
931 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
932 unsigned char *sha1, const char *base_url)
933 {
934 struct packed_git *new_pack;
935 char *tmp_idx = NULL;
936 int ret;
937
938 if (has_pack_index(sha1)) {
939 new_pack = parse_pack_index(sha1, NULL);
940 if (!new_pack)
941 return -1; /* parse_pack_index() already issued error message */
942 goto add_pack;
943 }
944
945 tmp_idx = fetch_pack_index(sha1, base_url);
946 if (!tmp_idx)
947 return -1;
948
949 new_pack = parse_pack_index(sha1, tmp_idx);
950 if (!new_pack) {
951 unlink(tmp_idx);
952 free(tmp_idx);
953
954 return -1; /* parse_pack_index() already issued error message */
955 }
956
957 ret = verify_pack_index(new_pack);
958 if (!ret) {
959 close_pack_index(new_pack);
960 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
961 }
962 free(tmp_idx);
963 if (ret)
964 return -1;
965
966 add_pack:
967 new_pack->next = *packs_head;
968 *packs_head = new_pack;
969 return 0;
970 }
971
972 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
973 {
974 int ret = 0, i = 0;
975 char *url, *data;
976 struct strbuf buf = STRBUF_INIT;
977 unsigned char sha1[20];
978
979 end_url_with_slash(&buf, base_url);
980 strbuf_addstr(&buf, "objects/info/packs");
981 url = strbuf_detach(&buf, NULL);
982
983 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
984 if (ret != HTTP_OK)
985 goto cleanup;
986
987 data = buf.buf;
988 while (i < buf.len) {
989 switch (data[i]) {
990 case 'P':
991 i++;
992 if (i + 52 <= buf.len &&
993 !prefixcmp(data + i, " pack-") &&
994 !prefixcmp(data + i + 46, ".pack\n")) {
995 get_sha1_hex(data + i + 6, sha1);
996 fetch_and_setup_pack_index(packs_head, sha1,
997 base_url);
998 i += 51;
999 break;
1000 }
1001 default:
1002 while (i < buf.len && data[i] != '\n')
1003 i++;
1004 }
1005 i++;
1006 }
1007
1008 cleanup:
1009 free(url);
1010 return ret;
1011 }
1012
1013 void release_http_pack_request(struct http_pack_request *preq)
1014 {
1015 if (preq->packfile != NULL) {
1016 fclose(preq->packfile);
1017 preq->packfile = NULL;
1018 }
1019 if (preq->range_header != NULL) {
1020 curl_slist_free_all(preq->range_header);
1021 preq->range_header = NULL;
1022 }
1023 preq->slot = NULL;
1024 free(preq->url);
1025 }
1026
1027 int finish_http_pack_request(struct http_pack_request *preq)
1028 {
1029 struct packed_git **lst;
1030 struct packed_git *p = preq->target;
1031 char *tmp_idx;
1032 struct child_process ip;
1033 const char *ip_argv[8];
1034
1035 close_pack_index(p);
1036
1037 fclose(preq->packfile);
1038 preq->packfile = NULL;
1039
1040 lst = preq->lst;
1041 while (*lst != p)
1042 lst = &((*lst)->next);
1043 *lst = (*lst)->next;
1044
1045 tmp_idx = xstrdup(preq->tmpfile);
1046 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1047 ".idx.temp");
1048
1049 ip_argv[0] = "index-pack";
1050 ip_argv[1] = "-o";
1051 ip_argv[2] = tmp_idx;
1052 ip_argv[3] = preq->tmpfile;
1053 ip_argv[4] = NULL;
1054
1055 memset(&ip, 0, sizeof(ip));
1056 ip.argv = ip_argv;
1057 ip.git_cmd = 1;
1058 ip.no_stdin = 1;
1059 ip.no_stdout = 1;
1060
1061 if (run_command(&ip)) {
1062 unlink(preq->tmpfile);
1063 unlink(tmp_idx);
1064 free(tmp_idx);
1065 return -1;
1066 }
1067
1068 unlink(sha1_pack_index_name(p->sha1));
1069
1070 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1071 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1072 free(tmp_idx);
1073 return -1;
1074 }
1075
1076 install_packed_git(p);
1077 free(tmp_idx);
1078 return 0;
1079 }
1080
1081 struct http_pack_request *new_http_pack_request(
1082 struct packed_git *target, const char *base_url)
1083 {
1084 long prev_posn = 0;
1085 char range[RANGE_HEADER_SIZE];
1086 struct strbuf buf = STRBUF_INIT;
1087 struct http_pack_request *preq;
1088
1089 preq = xcalloc(1, sizeof(*preq));
1090 preq->target = target;
1091
1092 end_url_with_slash(&buf, base_url);
1093 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1094 sha1_to_hex(target->sha1));
1095 preq->url = strbuf_detach(&buf, NULL);
1096
1097 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1098 sha1_pack_name(target->sha1));
1099 preq->packfile = fopen(preq->tmpfile, "a");
1100 if (!preq->packfile) {
1101 error("Unable to open local file %s for pack",
1102 preq->tmpfile);
1103 goto abort;
1104 }
1105
1106 preq->slot = get_active_slot();
1107 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1108 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1109 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1110 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1111 no_pragma_header);
1112
1113 /*
1114 * If there is data present from a previous transfer attempt,
1115 * resume where it left off
1116 */
1117 prev_posn = ftell(preq->packfile);
1118 if (prev_posn>0) {
1119 if (http_is_verbose)
1120 fprintf(stderr,
1121 "Resuming fetch of pack %s at byte %ld\n",
1122 sha1_to_hex(target->sha1), prev_posn);
1123 sprintf(range, "Range: bytes=%ld-", prev_posn);
1124 preq->range_header = curl_slist_append(NULL, range);
1125 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1126 preq->range_header);
1127 }
1128
1129 return preq;
1130
1131 abort:
1132 free(preq->url);
1133 free(preq);
1134 return NULL;
1135 }
1136
1137 /* Helpers for fetching objects (loose) */
1138 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1139 void *data)
1140 {
1141 unsigned char expn[4096];
1142 size_t size = eltsize * nmemb;
1143 int posn = 0;
1144 struct http_object_request *freq =
1145 (struct http_object_request *)data;
1146 do {
1147 ssize_t retval = xwrite(freq->localfile,
1148 (char *) ptr + posn, size - posn);
1149 if (retval < 0)
1150 return posn;
1151 posn += retval;
1152 } while (posn < size);
1153
1154 freq->stream.avail_in = size;
1155 freq->stream.next_in = (void *)ptr;
1156 do {
1157 freq->stream.next_out = expn;
1158 freq->stream.avail_out = sizeof(expn);
1159 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1160 git_SHA1_Update(&freq->c, expn,
1161 sizeof(expn) - freq->stream.avail_out);
1162 } while (freq->stream.avail_in && freq->zret == Z_OK);
1163 return size;
1164 }
1165
1166 struct http_object_request *new_http_object_request(const char *base_url,
1167 unsigned char *sha1)
1168 {
1169 char *hex = sha1_to_hex(sha1);
1170 char *filename;
1171 char prevfile[PATH_MAX];
1172 int prevlocal;
1173 char prev_buf[PREV_BUF_SIZE];
1174 ssize_t prev_read = 0;
1175 long prev_posn = 0;
1176 char range[RANGE_HEADER_SIZE];
1177 struct curl_slist *range_header = NULL;
1178 struct http_object_request *freq;
1179
1180 freq = xcalloc(1, sizeof(*freq));
1181 hashcpy(freq->sha1, sha1);
1182 freq->localfile = -1;
1183
1184 filename = sha1_file_name(sha1);
1185 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1186 "%s.temp", filename);
1187
1188 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1189 unlink_or_warn(prevfile);
1190 rename(freq->tmpfile, prevfile);
1191 unlink_or_warn(freq->tmpfile);
1192
1193 if (freq->localfile != -1)
1194 error("fd leakage in start: %d", freq->localfile);
1195 freq->localfile = open(freq->tmpfile,
1196 O_WRONLY | O_CREAT | O_EXCL, 0666);
1197 /*
1198 * This could have failed due to the "lazy directory creation";
1199 * try to mkdir the last path component.
1200 */
1201 if (freq->localfile < 0 && errno == ENOENT) {
1202 char *dir = strrchr(freq->tmpfile, '/');
1203 if (dir) {
1204 *dir = 0;
1205 mkdir(freq->tmpfile, 0777);
1206 *dir = '/';
1207 }
1208 freq->localfile = open(freq->tmpfile,
1209 O_WRONLY | O_CREAT | O_EXCL, 0666);
1210 }
1211
1212 if (freq->localfile < 0) {
1213 error("Couldn't create temporary file %s: %s",
1214 freq->tmpfile, strerror(errno));
1215 goto abort;
1216 }
1217
1218 git_inflate_init(&freq->stream);
1219
1220 git_SHA1_Init(&freq->c);
1221
1222 freq->url = get_remote_object_url(base_url, hex, 0);
1223
1224 /*
1225 * If a previous temp file is present, process what was already
1226 * fetched.
1227 */
1228 prevlocal = open(prevfile, O_RDONLY);
1229 if (prevlocal != -1) {
1230 do {
1231 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1232 if (prev_read>0) {
1233 if (fwrite_sha1_file(prev_buf,
1234 1,
1235 prev_read,
1236 freq) == prev_read) {
1237 prev_posn += prev_read;
1238 } else {
1239 prev_read = -1;
1240 }
1241 }
1242 } while (prev_read > 0);
1243 close(prevlocal);
1244 }
1245 unlink_or_warn(prevfile);
1246
1247 /*
1248 * Reset inflate/SHA1 if there was an error reading the previous temp
1249 * file; also rewind to the beginning of the local file.
1250 */
1251 if (prev_read == -1) {
1252 memset(&freq->stream, 0, sizeof(freq->stream));
1253 git_inflate_init(&freq->stream);
1254 git_SHA1_Init(&freq->c);
1255 if (prev_posn>0) {
1256 prev_posn = 0;
1257 lseek(freq->localfile, 0, SEEK_SET);
1258 if (ftruncate(freq->localfile, 0) < 0) {
1259 error("Couldn't truncate temporary file %s: %s",
1260 freq->tmpfile, strerror(errno));
1261 goto abort;
1262 }
1263 }
1264 }
1265
1266 freq->slot = get_active_slot();
1267
1268 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1269 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1270 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1271 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1272 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1273
1274 /*
1275 * If we have successfully processed data from a previous fetch
1276 * attempt, only fetch the data we don't already have.
1277 */
1278 if (prev_posn>0) {
1279 if (http_is_verbose)
1280 fprintf(stderr,
1281 "Resuming fetch of object %s at byte %ld\n",
1282 hex, prev_posn);
1283 sprintf(range, "Range: bytes=%ld-", prev_posn);
1284 range_header = curl_slist_append(range_header, range);
1285 curl_easy_setopt(freq->slot->curl,
1286 CURLOPT_HTTPHEADER, range_header);
1287 }
1288
1289 return freq;
1290
1291 abort:
1292 free(freq->url);
1293 free(freq);
1294 return NULL;
1295 }
1296
1297 void process_http_object_request(struct http_object_request *freq)
1298 {
1299 if (freq->slot == NULL)
1300 return;
1301 freq->curl_result = freq->slot->curl_result;
1302 freq->http_code = freq->slot->http_code;
1303 freq->slot = NULL;
1304 }
1305
1306 int finish_http_object_request(struct http_object_request *freq)
1307 {
1308 struct stat st;
1309
1310 close(freq->localfile);
1311 freq->localfile = -1;
1312
1313 process_http_object_request(freq);
1314
1315 if (freq->http_code == 416) {
1316 warning("requested range invalid; we may already have all the data.");
1317 } else if (freq->curl_result != CURLE_OK) {
1318 if (stat(freq->tmpfile, &st) == 0)
1319 if (st.st_size == 0)
1320 unlink_or_warn(freq->tmpfile);
1321 return -1;
1322 }
1323
1324 git_inflate_end(&freq->stream);
1325 git_SHA1_Final(freq->real_sha1, &freq->c);
1326 if (freq->zret != Z_STREAM_END) {
1327 unlink_or_warn(freq->tmpfile);
1328 return -1;
1329 }
1330 if (hashcmp(freq->sha1, freq->real_sha1)) {
1331 unlink_or_warn(freq->tmpfile);
1332 return -1;
1333 }
1334 freq->rename =
1335 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1336
1337 return freq->rename;
1338 }
1339
1340 void abort_http_object_request(struct http_object_request *freq)
1341 {
1342 unlink_or_warn(freq->tmpfile);
1343
1344 release_http_object_request(freq);
1345 }
1346
1347 void release_http_object_request(struct http_object_request *freq)
1348 {
1349 if (freq->localfile != -1) {
1350 close(freq->localfile);
1351 freq->localfile = -1;
1352 }
1353 if (freq->url != NULL) {
1354 free(freq->url);
1355 freq->url = NULL;
1356 }
1357 if (freq->slot != NULL) {
1358 freq->slot->callback_func = NULL;
1359 freq->slot->callback_data = NULL;
1360 release_active_slot(freq->slot);
1361 freq->slot = NULL;
1362 }
1363 }
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