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avoid segfaults on parse_object failure
[git/mingw/4msysgit.git] / http.c
blobdf9bb710863e30ba98d7661f84e872b30ed4449e
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 "version.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 http_options(const char *var, const char *value, void *cb)
143 {
144 if (!strcmp("http.sslverify", var)) {
145 curl_ssl_verify = git_config_bool(var, value);
146 return 0;
147 }
148 if (!strcmp("http.sslcert", var))
149 return git_config_string(&ssl_cert, var, value);
150 #if LIBCURL_VERSION_NUM >= 0x070903
151 if (!strcmp("http.sslkey", var))
152 return git_config_string(&ssl_key, var, value);
153 #endif
154 #if LIBCURL_VERSION_NUM >= 0x070908
155 if (!strcmp("http.sslcapath", var))
156 return git_config_string(&ssl_capath, var, value);
157 #endif
158 if (!strcmp("http.sslcainfo", var))
159 return git_config_string(&ssl_cainfo, var, value);
160 if (!strcmp("http.sslcertpasswordprotected", var)) {
161 if (git_config_bool(var, value))
162 ssl_cert_password_required = 1;
163 return 0;
164 }
165 if (!strcmp("http.minsessions", var)) {
166 min_curl_sessions = git_config_int(var, value);
167 #ifndef USE_CURL_MULTI
168 if (min_curl_sessions > 1)
169 min_curl_sessions = 1;
170 #endif
171 return 0;
172 }
173 #ifdef USE_CURL_MULTI
174 if (!strcmp("http.maxrequests", var)) {
175 max_requests = git_config_int(var, value);
176 return 0;
177 }
178 #endif
179 if (!strcmp("http.lowspeedlimit", var)) {
180 curl_low_speed_limit = (long)git_config_int(var, value);
181 return 0;
182 }
183 if (!strcmp("http.lowspeedtime", var)) {
184 curl_low_speed_time = (long)git_config_int(var, value);
185 return 0;
186 }
187
188 if (!strcmp("http.noepsv", var)) {
189 curl_ftp_no_epsv = git_config_bool(var, value);
190 return 0;
191 }
192 if (!strcmp("http.proxy", var))
193 return git_config_string(&curl_http_proxy, var, value);
194
195 if (!strcmp("http.cookiefile", var))
196 return git_config_string(&curl_cookie_file, var, value);
197
198 if (!strcmp("http.postbuffer", var)) {
199 http_post_buffer = git_config_int(var, value);
200 if (http_post_buffer < LARGE_PACKET_MAX)
201 http_post_buffer = LARGE_PACKET_MAX;
202 return 0;
203 }
204
205 if (!strcmp("http.useragent", var))
206 return git_config_string(&user_agent, var, value);
207
208 /* Fall back on the default ones */
209 return git_default_config(var, value, cb);
210 }
211
212 static void init_curl_http_auth(CURL *result)
213 {
214 if (!http_auth.username)
215 return;
216
217 credential_fill(&http_auth);
218
219 #if LIBCURL_VERSION_NUM >= 0x071301
220 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
221 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
222 #else
223 {
224 static struct strbuf up = STRBUF_INIT;
225 strbuf_reset(&up);
226 strbuf_addf(&up, "%s:%s",
227 http_auth.username, http_auth.password);
228 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
229 }
230 #endif
231 }
232
233 static int has_cert_password(void)
234 {
235 if (ssl_cert == NULL || ssl_cert_password_required != 1)
236 return 0;
237 if (!cert_auth.password) {
238 cert_auth.protocol = xstrdup("cert");
239 cert_auth.path = xstrdup(ssl_cert);
240 credential_fill(&cert_auth);
241 }
242 return 1;
243 }
244
245 static CURL *get_curl_handle(void)
246 {
247 CURL *result = curl_easy_init();
248
249 if (!curl_ssl_verify) {
250 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
251 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
252 } else {
253 /* Verify authenticity of the peer's certificate */
254 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
255 /* The name in the cert must match whom we tried to connect */
256 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
257 }
258
259 #if LIBCURL_VERSION_NUM >= 0x070907
260 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
261 #endif
262 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
263 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
264 #endif
265
266 if (http_proactive_auth)
267 init_curl_http_auth(result);
268
269 if (ssl_cert != NULL)
270 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
271 if (has_cert_password())
272 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
273 #if LIBCURL_VERSION_NUM >= 0x070903
274 if (ssl_key != NULL)
275 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
276 #endif
277 #if LIBCURL_VERSION_NUM >= 0x070908
278 if (ssl_capath != NULL)
279 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
280 #endif
281 if (ssl_cainfo != NULL)
282 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
283 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
284
285 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
286 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
287 curl_low_speed_limit);
288 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
289 curl_low_speed_time);
290 }
291
292 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
293 #if LIBCURL_VERSION_NUM >= 0x071301
294 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
295 #elif LIBCURL_VERSION_NUM >= 0x071101
296 curl_easy_setopt(result, CURLOPT_POST301, 1);
297 #endif
298
299 if (getenv("GIT_CURL_VERBOSE"))
300 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
301
302 curl_easy_setopt(result, CURLOPT_USERAGENT,
303 user_agent ? user_agent : git_user_agent());
304
305 if (curl_ftp_no_epsv)
306 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
307
308 if (curl_http_proxy) {
309 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
310 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
311 }
312
313 return result;
314 }
315
316 static void set_from_env(const char **var, const char *envname)
317 {
318 const char *val = getenv(envname);
319 if (val)
320 *var = val;
321 }
322
323 void http_init(struct remote *remote, const char *url, int proactive_auth)
324 {
325 char *low_speed_limit;
326 char *low_speed_time;
327
328 http_is_verbose = 0;
329
330 git_config(http_options, NULL);
331
332 curl_global_init(CURL_GLOBAL_ALL);
333
334 http_proactive_auth = proactive_auth;
335
336 if (remote && remote->http_proxy)
337 curl_http_proxy = xstrdup(remote->http_proxy);
338
339 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
340 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
341
342 #ifdef USE_CURL_MULTI
343 {
344 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
345 if (http_max_requests != NULL)
346 max_requests = atoi(http_max_requests);
347 }
348
349 curlm = curl_multi_init();
350 if (curlm == NULL) {
351 fprintf(stderr, "Error creating curl multi handle.\n");
352 exit(1);
353 }
354 #endif
355
356 if (getenv("GIT_SSL_NO_VERIFY"))
357 curl_ssl_verify = 0;
358
359 set_from_env(&ssl_cert, "GIT_SSL_CERT");
360 #if LIBCURL_VERSION_NUM >= 0x070903
361 set_from_env(&ssl_key, "GIT_SSL_KEY");
362 #endif
363 #if LIBCURL_VERSION_NUM >= 0x070908
364 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
365 #endif
366 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
367
368 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
369
370 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
371 if (low_speed_limit != NULL)
372 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
373 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
374 if (low_speed_time != NULL)
375 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
376
377 if (curl_ssl_verify == -1)
378 curl_ssl_verify = 1;
379
380 curl_session_count = 0;
381 #ifdef USE_CURL_MULTI
382 if (max_requests < 1)
383 max_requests = DEFAULT_MAX_REQUESTS;
384 #endif
385
386 if (getenv("GIT_CURL_FTP_NO_EPSV"))
387 curl_ftp_no_epsv = 1;
388
389 if (url) {
390 credential_from_url(&http_auth, url);
391 if (!ssl_cert_password_required &&
392 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
393 !prefixcmp(url, "https://"))
394 ssl_cert_password_required = 1;
395 }
396
397 #ifndef NO_CURL_EASY_DUPHANDLE
398 curl_default = get_curl_handle();
399 #endif
400 }
401
402 void http_cleanup(void)
403 {
404 struct active_request_slot *slot = active_queue_head;
405
406 while (slot != NULL) {
407 struct active_request_slot *next = slot->next;
408 if (slot->curl != NULL) {
409 #ifdef USE_CURL_MULTI
410 curl_multi_remove_handle(curlm, slot->curl);
411 #endif
412 curl_easy_cleanup(slot->curl);
413 }
414 free(slot);
415 slot = next;
416 }
417 active_queue_head = NULL;
418
419 #ifndef NO_CURL_EASY_DUPHANDLE
420 curl_easy_cleanup(curl_default);
421 #endif
422
423 #ifdef USE_CURL_MULTI
424 curl_multi_cleanup(curlm);
425 #endif
426 curl_global_cleanup();
427
428 curl_slist_free_all(pragma_header);
429 pragma_header = NULL;
430
431 curl_slist_free_all(no_pragma_header);
432 no_pragma_header = NULL;
433
434 if (curl_http_proxy) {
435 free((void *)curl_http_proxy);
436 curl_http_proxy = NULL;
437 }
438
439 if (cert_auth.password != NULL) {
440 memset(cert_auth.password, 0, strlen(cert_auth.password));
441 free(cert_auth.password);
442 cert_auth.password = NULL;
443 }
444 ssl_cert_password_required = 0;
445 }
446
447 struct active_request_slot *get_active_slot(void)
448 {
449 struct active_request_slot *slot = active_queue_head;
450 struct active_request_slot *newslot;
451
452 #ifdef USE_CURL_MULTI
453 int num_transfers;
454
455 /* Wait for a slot to open up if the queue is full */
456 while (active_requests >= max_requests) {
457 curl_multi_perform(curlm, &num_transfers);
458 if (num_transfers < active_requests)
459 process_curl_messages();
460 }
461 #endif
462
463 while (slot != NULL && slot->in_use)
464 slot = slot->next;
465
466 if (slot == NULL) {
467 newslot = xmalloc(sizeof(*newslot));
468 newslot->curl = NULL;
469 newslot->in_use = 0;
470 newslot->next = NULL;
471
472 slot = active_queue_head;
473 if (slot == NULL) {
474 active_queue_head = newslot;
475 } else {
476 while (slot->next != NULL)
477 slot = slot->next;
478 slot->next = newslot;
479 }
480 slot = newslot;
481 }
482
483 if (slot->curl == NULL) {
484 #ifdef NO_CURL_EASY_DUPHANDLE
485 slot->curl = get_curl_handle();
486 #else
487 slot->curl = curl_easy_duphandle(curl_default);
488 #endif
489 curl_session_count++;
490 }
491
492 active_requests++;
493 slot->in_use = 1;
494 slot->results = NULL;
495 slot->finished = NULL;
496 slot->callback_data = NULL;
497 slot->callback_func = NULL;
498 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
499 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
500 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
501 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
502 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
503 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
504 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
505 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
506 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
507 if (http_auth.password)
508 init_curl_http_auth(slot->curl);
509
510 return slot;
511 }
512
513 int start_active_slot(struct active_request_slot *slot)
514 {
515 #ifdef USE_CURL_MULTI
516 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
517 int num_transfers;
518
519 if (curlm_result != CURLM_OK &&
520 curlm_result != CURLM_CALL_MULTI_PERFORM) {
521 active_requests--;
522 slot->in_use = 0;
523 return 0;
524 }
525
526 /*
527 * We know there must be something to do, since we just added
528 * something.
529 */
530 curl_multi_perform(curlm, &num_transfers);
531 #endif
532 return 1;
533 }
534
535 #ifdef USE_CURL_MULTI
536 struct fill_chain {
537 void *data;
538 int (*fill)(void *);
539 struct fill_chain *next;
540 };
541
542 static struct fill_chain *fill_cfg;
543
544 void add_fill_function(void *data, int (*fill)(void *))
545 {
546 struct fill_chain *new = xmalloc(sizeof(*new));
547 struct fill_chain **linkp = &fill_cfg;
548 new->data = data;
549 new->fill = fill;
550 new->next = NULL;
551 while (*linkp)
552 linkp = &(*linkp)->next;
553 *linkp = new;
554 }
555
556 void fill_active_slots(void)
557 {
558 struct active_request_slot *slot = active_queue_head;
559
560 while (active_requests < max_requests) {
561 struct fill_chain *fill;
562 for (fill = fill_cfg; fill; fill = fill->next)
563 if (fill->fill(fill->data))
564 break;
565
566 if (!fill)
567 break;
568 }
569
570 while (slot != NULL) {
571 if (!slot->in_use && slot->curl != NULL
572 && curl_session_count > min_curl_sessions) {
573 curl_easy_cleanup(slot->curl);
574 slot->curl = NULL;
575 curl_session_count--;
576 }
577 slot = slot->next;
578 }
579 }
580
581 void step_active_slots(void)
582 {
583 int num_transfers;
584 CURLMcode curlm_result;
585
586 do {
587 curlm_result = curl_multi_perform(curlm, &num_transfers);
588 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
589 if (num_transfers < active_requests) {
590 process_curl_messages();
591 fill_active_slots();
592 }
593 }
594 #endif
595
596 void run_active_slot(struct active_request_slot *slot)
597 {
598 #ifdef USE_CURL_MULTI
599 fd_set readfds;
600 fd_set writefds;
601 fd_set excfds;
602 int max_fd;
603 struct timeval select_timeout;
604 int finished = 0;
605
606 slot->finished = &finished;
607 while (!finished) {
608 step_active_slots();
609
610 if (slot->in_use) {
611 #if LIBCURL_VERSION_NUM >= 0x070f04
612 long curl_timeout;
613 curl_multi_timeout(curlm, &curl_timeout);
614 if (curl_timeout == 0) {
615 continue;
616 } else if (curl_timeout == -1) {
617 select_timeout.tv_sec = 0;
618 select_timeout.tv_usec = 50000;
619 } else {
620 select_timeout.tv_sec = curl_timeout / 1000;
621 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
622 }
623 #else
624 select_timeout.tv_sec = 0;
625 select_timeout.tv_usec = 50000;
626 #endif
627
628 max_fd = -1;
629 FD_ZERO(&readfds);
630 FD_ZERO(&writefds);
631 FD_ZERO(&excfds);
632 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
633
634 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
635 }
636 }
637 #else
638 while (slot->in_use) {
639 slot->curl_result = curl_easy_perform(slot->curl);
640 finish_active_slot(slot);
641 }
642 #endif
643 }
644
645 static void closedown_active_slot(struct active_request_slot *slot)
646 {
647 active_requests--;
648 slot->in_use = 0;
649 }
650
651 static void release_active_slot(struct active_request_slot *slot)
652 {
653 closedown_active_slot(slot);
654 if (slot->curl && curl_session_count > min_curl_sessions) {
655 #ifdef USE_CURL_MULTI
656 curl_multi_remove_handle(curlm, slot->curl);
657 #endif
658 curl_easy_cleanup(slot->curl);
659 slot->curl = NULL;
660 curl_session_count--;
661 }
662 #ifdef USE_CURL_MULTI
663 fill_active_slots();
664 #endif
665 }
666
667 void finish_active_slot(struct active_request_slot *slot)
668 {
669 closedown_active_slot(slot);
670 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
671
672 if (slot->finished != NULL)
673 (*slot->finished) = 1;
674
675 /* Store slot results so they can be read after the slot is reused */
676 if (slot->results != NULL) {
677 slot->results->curl_result = slot->curl_result;
678 slot->results->http_code = slot->http_code;
679 }
680
681 /* Run callback if appropriate */
682 if (slot->callback_func != NULL)
683 slot->callback_func(slot->callback_data);
684 }
685
686 void finish_all_active_slots(void)
687 {
688 struct active_request_slot *slot = active_queue_head;
689
690 while (slot != NULL)
691 if (slot->in_use) {
692 run_active_slot(slot);
693 slot = active_queue_head;
694 } else {
695 slot = slot->next;
696 }
697 }
698
699 /* Helpers for modifying and creating URLs */
700 static inline int needs_quote(int ch)
701 {
702 if (((ch >= 'A') && (ch <= 'Z'))
703 || ((ch >= 'a') && (ch <= 'z'))
704 || ((ch >= '0') && (ch <= '9'))
705 || (ch == '/')
706 || (ch == '-')
707 || (ch == '.'))
708 return 0;
709 return 1;
710 }
711
712 static char *quote_ref_url(const char *base, const char *ref)
713 {
714 struct strbuf buf = STRBUF_INIT;
715 const char *cp;
716 int ch;
717
718 end_url_with_slash(&buf, base);
719
720 for (cp = ref; (ch = *cp) != 0; cp++)
721 if (needs_quote(ch))
722 strbuf_addf(&buf, "%%%02x", ch);
723 else
724 strbuf_addch(&buf, *cp);
725
726 return strbuf_detach(&buf, NULL);
727 }
728
729 void append_remote_object_url(struct strbuf *buf, const char *url,
730 const char *hex,
731 int only_two_digit_prefix)
732 {
733 end_url_with_slash(buf, url);
734
735 strbuf_addf(buf, "objects/%.*s/", 2, hex);
736 if (!only_two_digit_prefix)
737 strbuf_addf(buf, "%s", hex+2);
738 }
739
740 char *get_remote_object_url(const char *url, const char *hex,
741 int only_two_digit_prefix)
742 {
743 struct strbuf buf = STRBUF_INIT;
744 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
745 return strbuf_detach(&buf, NULL);
746 }
747
748 int handle_curl_result(struct active_request_slot *slot,
749 struct slot_results *results)
750 {
751 if (results->curl_result == CURLE_OK) {
752 credential_approve(&http_auth);
753 return HTTP_OK;
754 } else if (missing_target(results))
755 return HTTP_MISSING_TARGET;
756 else if (results->http_code == 401) {
757 if (http_auth.username && http_auth.password) {
758 credential_reject(&http_auth);
759 return HTTP_NOAUTH;
760 } else {
761 credential_fill(&http_auth);
762 init_curl_http_auth(slot->curl);
763 return HTTP_REAUTH;
764 }
765 } else {
766 #if LIBCURL_VERSION_NUM >= 0x070c00
767 if (!curl_errorstr[0])
768 strlcpy(curl_errorstr,
769 curl_easy_strerror(results->curl_result),
770 sizeof(curl_errorstr));
771 #endif
772 return HTTP_ERROR;
773 }
774 }
775
776 /* http_request() targets */
777 #define HTTP_REQUEST_STRBUF 0
778 #define HTTP_REQUEST_FILE 1
779
780 static int http_request(const char *url, void *result, int target, int options)
781 {
782 struct active_request_slot *slot;
783 struct slot_results results;
784 struct curl_slist *headers = NULL;
785 struct strbuf buf = STRBUF_INIT;
786 int ret;
787
788 slot = get_active_slot();
789 slot->results = &results;
790 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
791
792 if (result == NULL) {
793 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
794 } else {
795 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
796 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
797
798 if (target == HTTP_REQUEST_FILE) {
799 long posn = ftell(result);
800 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
801 fwrite);
802 if (posn > 0) {
803 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
804 headers = curl_slist_append(headers, buf.buf);
805 strbuf_reset(&buf);
806 }
807 } else
808 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
809 fwrite_buffer);
810 }
811
812 strbuf_addstr(&buf, "Pragma:");
813 if (options & HTTP_NO_CACHE)
814 strbuf_addstr(&buf, " no-cache");
815
816 headers = curl_slist_append(headers, buf.buf);
817
818 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
819 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
820 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
821
822 if (start_active_slot(slot)) {
823 run_active_slot(slot);
824 ret = handle_curl_result(slot, &results);
825 } else {
826 error("Unable to start HTTP request for %s", url);
827 ret = HTTP_START_FAILED;
828 }
829
830 curl_slist_free_all(headers);
831 strbuf_release(&buf);
832
833 return ret;
834 }
835
836 static int http_request_reauth(const char *url, void *result, int target,
837 int options)
838 {
839 int ret = http_request(url, result, target, options);
840 if (ret != HTTP_REAUTH)
841 return ret;
842 return http_request(url, result, target, options);
843 }
844
845 int http_get_strbuf(const char *url, struct strbuf *result, int options)
846 {
847 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
848 }
849
850 /*
851 * Downloads a URL and stores the result in the given file.
852 *
853 * If a previous interrupted download is detected (i.e. a previous temporary
854 * file is still around) the download is resumed.
855 */
856 static int http_get_file(const char *url, const char *filename, int options)
857 {
858 int ret;
859 struct strbuf tmpfile = STRBUF_INIT;
860 FILE *result;
861
862 strbuf_addf(&tmpfile, "%s.temp", filename);
863 result = fopen(tmpfile.buf, "a");
864 if (! result) {
865 error("Unable to open local file %s", tmpfile.buf);
866 ret = HTTP_ERROR;
867 goto cleanup;
868 }
869
870 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
871 fclose(result);
872
873 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
874 ret = HTTP_ERROR;
875 cleanup:
876 strbuf_release(&tmpfile);
877 return ret;
878 }
879
880 int http_error(const char *url, int ret)
881 {
882 /* http_request has already handled HTTP_START_FAILED. */
883 if (ret != HTTP_START_FAILED)
884 error("%s while accessing %s", curl_errorstr, url);
885
886 return ret;
887 }
888
889 int http_fetch_ref(const char *base, struct ref *ref)
890 {
891 char *url;
892 struct strbuf buffer = STRBUF_INIT;
893 int ret = -1;
894
895 url = quote_ref_url(base, ref->name);
896 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
897 strbuf_rtrim(&buffer);
898 if (buffer.len == 40)
899 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
900 else if (!prefixcmp(buffer.buf, "ref: ")) {
901 ref->symref = xstrdup(buffer.buf + 5);
902 ret = 0;
903 }
904 }
905
906 strbuf_release(&buffer);
907 free(url);
908 return ret;
909 }
910
911 /* Helpers for fetching packs */
912 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
913 {
914 char *url, *tmp;
915 struct strbuf buf = STRBUF_INIT;
916
917 if (http_is_verbose)
918 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
919
920 end_url_with_slash(&buf, base_url);
921 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
922 url = strbuf_detach(&buf, NULL);
923
924 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
925 tmp = strbuf_detach(&buf, NULL);
926
927 if (http_get_file(url, tmp, 0) != HTTP_OK) {
928 error("Unable to get pack index %s", url);
929 free(tmp);
930 tmp = NULL;
931 }
932
933 free(url);
934 return tmp;
935 }
936
937 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
938 unsigned char *sha1, const char *base_url)
939 {
940 struct packed_git *new_pack;
941 char *tmp_idx = NULL;
942 int ret;
943
944 if (has_pack_index(sha1)) {
945 new_pack = parse_pack_index(sha1, NULL);
946 if (!new_pack)
947 return -1; /* parse_pack_index() already issued error message */
948 goto add_pack;
949 }
950
951 tmp_idx = fetch_pack_index(sha1, base_url);
952 if (!tmp_idx)
953 return -1;
954
955 new_pack = parse_pack_index(sha1, tmp_idx);
956 if (!new_pack) {
957 unlink(tmp_idx);
958 free(tmp_idx);
959
960 return -1; /* parse_pack_index() already issued error message */
961 }
962
963 ret = verify_pack_index(new_pack);
964 if (!ret) {
965 close_pack_index(new_pack);
966 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
967 }
968 free(tmp_idx);
969 if (ret)
970 return -1;
971
972 add_pack:
973 new_pack->next = *packs_head;
974 *packs_head = new_pack;
975 return 0;
976 }
977
978 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
979 {
980 int ret = 0, i = 0;
981 char *url, *data;
982 struct strbuf buf = STRBUF_INIT;
983 unsigned char sha1[20];
984
985 end_url_with_slash(&buf, base_url);
986 strbuf_addstr(&buf, "objects/info/packs");
987 url = strbuf_detach(&buf, NULL);
988
989 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
990 if (ret != HTTP_OK)
991 goto cleanup;
992
993 data = buf.buf;
994 while (i < buf.len) {
995 switch (data[i]) {
996 case 'P':
997 i++;
998 if (i + 52 <= buf.len &&
999 !prefixcmp(data + i, " pack-") &&
1000 !prefixcmp(data + i + 46, ".pack\n")) {
1001 get_sha1_hex(data + i + 6, sha1);
1002 fetch_and_setup_pack_index(packs_head, sha1,
1003 base_url);
1004 i += 51;
1005 break;
1006 }
1007 default:
1008 while (i < buf.len && data[i] != '\n')
1009 i++;
1010 }
1011 i++;
1012 }
1013
1014 cleanup:
1015 free(url);
1016 return ret;
1017 }
1018
1019 void release_http_pack_request(struct http_pack_request *preq)
1020 {
1021 if (preq->packfile != NULL) {
1022 fclose(preq->packfile);
1023 preq->packfile = NULL;
1024 }
1025 if (preq->range_header != NULL) {
1026 curl_slist_free_all(preq->range_header);
1027 preq->range_header = NULL;
1028 }
1029 preq->slot = NULL;
1030 free(preq->url);
1031 }
1032
1033 int finish_http_pack_request(struct http_pack_request *preq)
1034 {
1035 struct packed_git **lst;
1036 struct packed_git *p = preq->target;
1037 char *tmp_idx;
1038 struct child_process ip;
1039 const char *ip_argv[8];
1040
1041 close_pack_index(p);
1042
1043 fclose(preq->packfile);
1044 preq->packfile = NULL;
1045
1046 lst = preq->lst;
1047 while (*lst != p)
1048 lst = &((*lst)->next);
1049 *lst = (*lst)->next;
1050
1051 tmp_idx = xstrdup(preq->tmpfile);
1052 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1053 ".idx.temp");
1054
1055 ip_argv[0] = "index-pack";
1056 ip_argv[1] = "-o";
1057 ip_argv[2] = tmp_idx;
1058 ip_argv[3] = preq->tmpfile;
1059 ip_argv[4] = NULL;
1060
1061 memset(&ip, 0, sizeof(ip));
1062 ip.argv = ip_argv;
1063 ip.git_cmd = 1;
1064 ip.no_stdin = 1;
1065 ip.no_stdout = 1;
1066
1067 if (run_command(&ip)) {
1068 unlink(preq->tmpfile);
1069 unlink(tmp_idx);
1070 free(tmp_idx);
1071 return -1;
1072 }
1073
1074 unlink(sha1_pack_index_name(p->sha1));
1075
1076 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1077 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1078 free(tmp_idx);
1079 return -1;
1080 }
1081
1082 install_packed_git(p);
1083 free(tmp_idx);
1084 return 0;
1085 }
1086
1087 struct http_pack_request *new_http_pack_request(
1088 struct packed_git *target, const char *base_url)
1089 {
1090 long prev_posn = 0;
1091 char range[RANGE_HEADER_SIZE];
1092 struct strbuf buf = STRBUF_INIT;
1093 struct http_pack_request *preq;
1094
1095 preq = xcalloc(1, sizeof(*preq));
1096 preq->target = target;
1097
1098 end_url_with_slash(&buf, base_url);
1099 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1100 sha1_to_hex(target->sha1));
1101 preq->url = strbuf_detach(&buf, NULL);
1102
1103 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1104 sha1_pack_name(target->sha1));
1105 preq->packfile = fopen(preq->tmpfile, "a");
1106 if (!preq->packfile) {
1107 error("Unable to open local file %s for pack",
1108 preq->tmpfile);
1109 goto abort;
1110 }
1111
1112 preq->slot = get_active_slot();
1113 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1114 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1115 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1116 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1117 no_pragma_header);
1118
1119 /*
1120 * If there is data present from a previous transfer attempt,
1121 * resume where it left off
1122 */
1123 prev_posn = ftell(preq->packfile);
1124 if (prev_posn>0) {
1125 if (http_is_verbose)
1126 fprintf(stderr,
1127 "Resuming fetch of pack %s at byte %ld\n",
1128 sha1_to_hex(target->sha1), prev_posn);
1129 sprintf(range, "Range: bytes=%ld-", prev_posn);
1130 preq->range_header = curl_slist_append(NULL, range);
1131 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1132 preq->range_header);
1133 }
1134
1135 return preq;
1136
1137 abort:
1138 free(preq->url);
1139 free(preq);
1140 return NULL;
1141 }
1142
1143 /* Helpers for fetching objects (loose) */
1144 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1145 void *data)
1146 {
1147 unsigned char expn[4096];
1148 size_t size = eltsize * nmemb;
1149 int posn = 0;
1150 struct http_object_request *freq =
1151 (struct http_object_request *)data;
1152 do {
1153 ssize_t retval = xwrite(freq->localfile,
1154 (char *) ptr + posn, size - posn);
1155 if (retval < 0)
1156 return posn;
1157 posn += retval;
1158 } while (posn < size);
1159
1160 freq->stream.avail_in = size;
1161 freq->stream.next_in = (void *)ptr;
1162 do {
1163 freq->stream.next_out = expn;
1164 freq->stream.avail_out = sizeof(expn);
1165 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1166 git_SHA1_Update(&freq->c, expn,
1167 sizeof(expn) - freq->stream.avail_out);
1168 } while (freq->stream.avail_in && freq->zret == Z_OK);
1169 return size;
1170 }
1171
1172 struct http_object_request *new_http_object_request(const char *base_url,
1173 unsigned char *sha1)
1174 {
1175 char *hex = sha1_to_hex(sha1);
1176 char *filename;
1177 char prevfile[PATH_MAX];
1178 int prevlocal;
1179 char prev_buf[PREV_BUF_SIZE];
1180 ssize_t prev_read = 0;
1181 long prev_posn = 0;
1182 char range[RANGE_HEADER_SIZE];
1183 struct curl_slist *range_header = NULL;
1184 struct http_object_request *freq;
1185
1186 freq = xcalloc(1, sizeof(*freq));
1187 hashcpy(freq->sha1, sha1);
1188 freq->localfile = -1;
1189
1190 filename = sha1_file_name(sha1);
1191 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1192 "%s.temp", filename);
1193
1194 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1195 unlink_or_warn(prevfile);
1196 rename(freq->tmpfile, prevfile);
1197 unlink_or_warn(freq->tmpfile);
1198
1199 if (freq->localfile != -1)
1200 error("fd leakage in start: %d", freq->localfile);
1201 freq->localfile = open(freq->tmpfile,
1202 O_WRONLY | O_CREAT | O_EXCL, 0666);
1203 /*
1204 * This could have failed due to the "lazy directory creation";
1205 * try to mkdir the last path component.
1206 */
1207 if (freq->localfile < 0 && errno == ENOENT) {
1208 char *dir = strrchr(freq->tmpfile, '/');
1209 if (dir) {
1210 *dir = 0;
1211 mkdir(freq->tmpfile, 0777);
1212 *dir = '/';
1213 }
1214 freq->localfile = open(freq->tmpfile,
1215 O_WRONLY | O_CREAT | O_EXCL, 0666);
1216 }
1217
1218 if (freq->localfile < 0) {
1219 error("Couldn't create temporary file %s: %s",
1220 freq->tmpfile, strerror(errno));
1221 goto abort;
1222 }
1223
1224 git_inflate_init(&freq->stream);
1225
1226 git_SHA1_Init(&freq->c);
1227
1228 freq->url = get_remote_object_url(base_url, hex, 0);
1229
1230 /*
1231 * If a previous temp file is present, process what was already
1232 * fetched.
1233 */
1234 prevlocal = open(prevfile, O_RDONLY);
1235 if (prevlocal != -1) {
1236 do {
1237 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1238 if (prev_read>0) {
1239 if (fwrite_sha1_file(prev_buf,
1240 1,
1241 prev_read,
1242 freq) == prev_read) {
1243 prev_posn += prev_read;
1244 } else {
1245 prev_read = -1;
1246 }
1247 }
1248 } while (prev_read > 0);
1249 close(prevlocal);
1250 }
1251 unlink_or_warn(prevfile);
1252
1253 /*
1254 * Reset inflate/SHA1 if there was an error reading the previous temp
1255 * file; also rewind to the beginning of the local file.
1256 */
1257 if (prev_read == -1) {
1258 memset(&freq->stream, 0, sizeof(freq->stream));
1259 git_inflate_init(&freq->stream);
1260 git_SHA1_Init(&freq->c);
1261 if (prev_posn>0) {
1262 prev_posn = 0;
1263 lseek(freq->localfile, 0, SEEK_SET);
1264 if (ftruncate(freq->localfile, 0) < 0) {
1265 error("Couldn't truncate temporary file %s: %s",
1266 freq->tmpfile, strerror(errno));
1267 goto abort;
1268 }
1269 }
1270 }
1271
1272 freq->slot = get_active_slot();
1273
1274 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1275 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1276 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1277 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1278 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1279
1280 /*
1281 * If we have successfully processed data from a previous fetch
1282 * attempt, only fetch the data we don't already have.
1283 */
1284 if (prev_posn>0) {
1285 if (http_is_verbose)
1286 fprintf(stderr,
1287 "Resuming fetch of object %s at byte %ld\n",
1288 hex, prev_posn);
1289 sprintf(range, "Range: bytes=%ld-", prev_posn);
1290 range_header = curl_slist_append(range_header, range);
1291 curl_easy_setopt(freq->slot->curl,
1292 CURLOPT_HTTPHEADER, range_header);
1293 }
1294
1295 return freq;
1296
1297 abort:
1298 free(freq->url);
1299 free(freq);
1300 return NULL;
1301 }
1302
1303 void process_http_object_request(struct http_object_request *freq)
1304 {
1305 if (freq->slot == NULL)
1306 return;
1307 freq->curl_result = freq->slot->curl_result;
1308 freq->http_code = freq->slot->http_code;
1309 freq->slot = NULL;
1310 }
1311
1312 int finish_http_object_request(struct http_object_request *freq)
1313 {
1314 struct stat st;
1315
1316 close(freq->localfile);
1317 freq->localfile = -1;
1318
1319 process_http_object_request(freq);
1320
1321 if (freq->http_code == 416) {
1322 warning("requested range invalid; we may already have all the data.");
1323 } else if (freq->curl_result != CURLE_OK) {
1324 if (stat(freq->tmpfile, &st) == 0)
1325 if (st.st_size == 0)
1326 unlink_or_warn(freq->tmpfile);
1327 return -1;
1328 }
1329
1330 git_inflate_end(&freq->stream);
1331 git_SHA1_Final(freq->real_sha1, &freq->c);
1332 if (freq->zret != Z_STREAM_END) {
1333 unlink_or_warn(freq->tmpfile);
1334 return -1;
1335 }
1336 if (hashcmp(freq->sha1, freq->real_sha1)) {
1337 unlink_or_warn(freq->tmpfile);
1338 return -1;
1339 }
1340 freq->rename =
1341 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1342
1343 return freq->rename;
1344 }
1345
1346 void abort_http_object_request(struct http_object_request *freq)
1347 {
1348 unlink_or_warn(freq->tmpfile);
1349
1350 release_http_object_request(freq);
1351 }
1352
1353 void release_http_object_request(struct http_object_request *freq)
1354 {
1355 if (freq->localfile != -1) {
1356 close(freq->localfile);
1357 freq->localfile = -1;
1358 }
1359 if (freq->url != NULL) {
1360 free(freq->url);
1361 freq->url = NULL;
1362 }
1363 if (freq->slot != NULL) {
1364 freq->slot->callback_func = NULL;
1365 freq->slot->callback_data = NULL;
1366 release_active_slot(freq->slot);
1367 freq->slot = NULL;
1368 }
1369 }
The MinGW fork, forked for msysGit