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Use a strbuf in symlink
[git/mingw/4msysgit.git] / http.c
blob72668b148ea1b4205b16a66f6b3b27c283027060
1 #include "http.h"
2 #include "pack.h"
3 #include "sideband.h"
4 #include "run-command.h"
5 #include "url.h"
6 #include "urlmatch.h"
7 #include "credential.h"
8 #include "version.h"
9 #include "pkt-line.h"
10 #include "exec_cmd.h"
11
12 int active_requests;
13 int http_is_verbose;
14 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
15
16 #if LIBCURL_VERSION_NUM >= 0x070a06
17 #define LIBCURL_CAN_HANDLE_AUTH_ANY
18 #endif
19
20 static int min_curl_sessions = 1;
21 static int curl_session_count;
22 #ifdef USE_CURL_MULTI
23 static int max_requests = -1;
24 static CURLM *curlm;
25 #endif
26 #ifndef NO_CURL_EASY_DUPHANDLE
27 static CURL *curl_default;
28 #endif
29
30 #define PREV_BUF_SIZE 4096
31 #define RANGE_HEADER_SIZE 30
32
33 char curl_errorstr[CURL_ERROR_SIZE];
34
35 static int curl_ssl_verify = -1;
36 static int curl_ssl_try;
37 static const char *ssl_cert;
38 #if LIBCURL_VERSION_NUM >= 0x070903
39 static const char *ssl_key;
40 #endif
41 #if LIBCURL_VERSION_NUM >= 0x070908
42 static const char *ssl_capath;
43 #endif
44 static const char *ssl_cainfo;
45 static long curl_low_speed_limit = -1;
46 static long curl_low_speed_time = -1;
47 static int curl_ftp_no_epsv;
48 static const char *curl_http_proxy;
49 static const char *curl_cookie_file;
50 static int curl_save_cookies;
51 struct credential http_auth = CREDENTIAL_INIT;
52 static int http_proactive_auth;
53 static const char *user_agent;
54
55 #if LIBCURL_VERSION_NUM >= 0x071700
56 /* Use CURLOPT_KEYPASSWD as is */
57 #elif LIBCURL_VERSION_NUM >= 0x070903
58 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
59 #else
60 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
61 #endif
62
63 static struct credential cert_auth = CREDENTIAL_INIT;
64 static int ssl_cert_password_required;
65
66 static struct curl_slist *pragma_header;
67 static struct curl_slist *no_pragma_header;
68
69 static struct active_request_slot *active_queue_head;
70
71 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
72 {
73 size_t size = eltsize * nmemb;
74 struct buffer *buffer = buffer_;
75
76 if (size > buffer->buf.len - buffer->posn)
77 size = buffer->buf.len - buffer->posn;
78 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
79 buffer->posn += size;
80
81 return size;
82 }
83
84 #ifndef NO_CURL_IOCTL
85 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
86 {
87 struct buffer *buffer = clientp;
88
89 switch (cmd) {
90 case CURLIOCMD_NOP:
91 return CURLIOE_OK;
92
93 case CURLIOCMD_RESTARTREAD:
94 buffer->posn = 0;
95 return CURLIOE_OK;
96
97 default:
98 return CURLIOE_UNKNOWNCMD;
99 }
100 }
101 #endif
102
103 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
104 {
105 size_t size = eltsize * nmemb;
106 struct strbuf *buffer = buffer_;
107
108 strbuf_add(buffer, ptr, size);
109 return size;
110 }
111
112 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
113 {
114 return eltsize * nmemb;
115 }
116
117 #ifdef USE_CURL_MULTI
118 static void process_curl_messages(void)
119 {
120 int num_messages;
121 struct active_request_slot *slot;
122 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
123
124 while (curl_message != NULL) {
125 if (curl_message->msg == CURLMSG_DONE) {
126 int curl_result = curl_message->data.result;
127 slot = active_queue_head;
128 while (slot != NULL &&
129 slot->curl != curl_message->easy_handle)
130 slot = slot->next;
131 if (slot != NULL) {
132 curl_multi_remove_handle(curlm, slot->curl);
133 slot->curl_result = curl_result;
134 finish_active_slot(slot);
135 } else {
136 fprintf(stderr, "Received DONE message for unknown request!\n");
137 }
138 } else {
139 fprintf(stderr, "Unknown CURL message received: %d\n",
140 (int)curl_message->msg);
141 }
142 curl_message = curl_multi_info_read(curlm, &num_messages);
143 }
144 }
145 #endif
146
147 static int git_config_path(const char **result,
148 const char *var, const char *value)
149 {
150 if (git_config_string(result, var, value))
151 return 1;
152 #ifdef __MINGW32__
153 if (**result == '/')
154 *result = system_path((*result) + 1);
155 #endif
156 return 0;
157 }
158
159 static int http_options(const char *var, const char *value, void *cb)
160 {
161 if (!strcmp("http.sslverify", var)) {
162 curl_ssl_verify = git_config_bool(var, value);
163 return 0;
164 }
165 if (!strcmp("http.sslcert", var))
166 return git_config_path(&ssl_cert, var, value);
167 #if LIBCURL_VERSION_NUM >= 0x070903
168 if (!strcmp("http.sslkey", var))
169 return git_config_path(&ssl_key, var, value);
170 #endif
171 #if LIBCURL_VERSION_NUM >= 0x070908
172 if (!strcmp("http.sslcapath", var))
173 return git_config_path(&ssl_capath, var, value);
174 #endif
175 if (!strcmp("http.sslcainfo", var))
176 return git_config_path(&ssl_cainfo, var, value);
177 if (!strcmp("http.sslcertpasswordprotected", var)) {
178 ssl_cert_password_required = git_config_bool(var, value);
179 return 0;
180 }
181 if (!strcmp("http.ssltry", var)) {
182 curl_ssl_try = git_config_bool(var, value);
183 return 0;
184 }
185 if (!strcmp("http.minsessions", var)) {
186 min_curl_sessions = git_config_int(var, value);
187 #ifndef USE_CURL_MULTI
188 if (min_curl_sessions > 1)
189 min_curl_sessions = 1;
190 #endif
191 return 0;
192 }
193 #ifdef USE_CURL_MULTI
194 if (!strcmp("http.maxrequests", var)) {
195 max_requests = git_config_int(var, value);
196 return 0;
197 }
198 #endif
199 if (!strcmp("http.lowspeedlimit", var)) {
200 curl_low_speed_limit = (long)git_config_int(var, value);
201 return 0;
202 }
203 if (!strcmp("http.lowspeedtime", var)) {
204 curl_low_speed_time = (long)git_config_int(var, value);
205 return 0;
206 }
207
208 if (!strcmp("http.noepsv", var)) {
209 curl_ftp_no_epsv = git_config_bool(var, value);
210 return 0;
211 }
212 if (!strcmp("http.proxy", var))
213 return git_config_string(&curl_http_proxy, var, value);
214
215 if (!strcmp("http.cookiefile", var))
216 return git_config_string(&curl_cookie_file, var, value);
217 if (!strcmp("http.savecookies", var)) {
218 curl_save_cookies = git_config_bool(var, value);
219 return 0;
220 }
221
222 if (!strcmp("http.postbuffer", var)) {
223 http_post_buffer = git_config_int(var, value);
224 if (http_post_buffer < LARGE_PACKET_MAX)
225 http_post_buffer = LARGE_PACKET_MAX;
226 return 0;
227 }
228
229 if (!strcmp("http.useragent", var))
230 return git_config_string(&user_agent, var, value);
231
232 /* Fall back on the default ones */
233 return git_default_config(var, value, cb);
234 }
235
236 static void init_curl_http_auth(CURL *result)
237 {
238 if (!http_auth.username)
239 return;
240
241 credential_fill(&http_auth);
242
243 #if LIBCURL_VERSION_NUM >= 0x071301
244 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
245 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
246 #else
247 {
248 static struct strbuf up = STRBUF_INIT;
249 /*
250 * Note that we assume we only ever have a single set of
251 * credentials in a given program run, so we do not have
252 * to worry about updating this buffer, only setting its
253 * initial value.
254 */
255 if (!up.len)
256 strbuf_addf(&up, "%s:%s",
257 http_auth.username, http_auth.password);
258 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
259 }
260 #endif
261 }
262
263 static int has_cert_password(void)
264 {
265 if (ssl_cert == NULL || ssl_cert_password_required != 1)
266 return 0;
267 if (!cert_auth.password) {
268 cert_auth.protocol = xstrdup("cert");
269 cert_auth.username = xstrdup("");
270 cert_auth.path = xstrdup(ssl_cert);
271 credential_fill(&cert_auth);
272 }
273 return 1;
274 }
275
276 #if LIBCURL_VERSION_NUM >= 0x071900
277 static void set_curl_keepalive(CURL *c)
278 {
279 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
280 }
281
282 #elif LIBCURL_VERSION_NUM >= 0x071000
283 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
284 {
285 int ka = 1;
286 int rc;
287 socklen_t len = (socklen_t)sizeof(ka);
288
289 if (type != CURLSOCKTYPE_IPCXN)
290 return 0;
291
292 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
293 if (rc < 0)
294 warning("unable to set SO_KEEPALIVE on socket %s",
295 strerror(errno));
296
297 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
298 }
299
300 static void set_curl_keepalive(CURL *c)
301 {
302 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
303 }
304
305 #else
306 static void set_curl_keepalive(CURL *c)
307 {
308 /* not supported on older curl versions */
309 }
310 #endif
311
312 static CURL *get_curl_handle(void)
313 {
314 CURL *result = curl_easy_init();
315
316 if (!curl_ssl_verify) {
317 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
318 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
319 } else {
320 /* Verify authenticity of the peer's certificate */
321 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
322 /* The name in the cert must match whom we tried to connect */
323 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
324 }
325
326 #if LIBCURL_VERSION_NUM >= 0x070907
327 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
328 #endif
329 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
330 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
331 #endif
332
333 if (http_proactive_auth)
334 init_curl_http_auth(result);
335
336 if (ssl_cert != NULL)
337 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
338 if (has_cert_password())
339 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
340 #if LIBCURL_VERSION_NUM >= 0x070903
341 if (ssl_key != NULL)
342 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
343 #endif
344 #if LIBCURL_VERSION_NUM >= 0x070908
345 if (ssl_capath != NULL)
346 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
347 #endif
348 if (ssl_cainfo != NULL)
349 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
350
351 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
352 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
353 curl_low_speed_limit);
354 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
355 curl_low_speed_time);
356 }
357
358 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
359 #if LIBCURL_VERSION_NUM >= 0x071301
360 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
361 #elif LIBCURL_VERSION_NUM >= 0x071101
362 curl_easy_setopt(result, CURLOPT_POST301, 1);
363 #endif
364
365 if (getenv("GIT_CURL_VERBOSE"))
366 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
367
368 curl_easy_setopt(result, CURLOPT_USERAGENT,
369 user_agent ? user_agent : git_user_agent());
370
371 if (curl_ftp_no_epsv)
372 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
373
374 #ifdef CURLOPT_USE_SSL
375 if (curl_ssl_try)
376 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
377 #endif
378
379 if (curl_http_proxy) {
380 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
381 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
382 }
383
384 set_curl_keepalive(result);
385
386 return result;
387 }
388
389 static void set_from_env(const char **var, const char *envname)
390 {
391 const char *val = getenv(envname);
392 if (val)
393 *var = val;
394 }
395
396 void http_init(struct remote *remote, const char *url, int proactive_auth)
397 {
398 char *low_speed_limit;
399 char *low_speed_time;
400 char *normalized_url;
401 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
402
403 config.section = "http";
404 config.key = NULL;
405 config.collect_fn = http_options;
406 config.cascade_fn = git_default_config;
407 config.cb = NULL;
408
409 http_is_verbose = 0;
410 normalized_url = url_normalize(url, &config.url);
411
412 git_config(urlmatch_config_entry, &config);
413 free(normalized_url);
414
415 curl_global_init(CURL_GLOBAL_ALL);
416
417 http_proactive_auth = proactive_auth;
418
419 if (remote && remote->http_proxy)
420 curl_http_proxy = xstrdup(remote->http_proxy);
421
422 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
423 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
424
425 #ifdef USE_CURL_MULTI
426 {
427 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
428 if (http_max_requests != NULL)
429 max_requests = atoi(http_max_requests);
430 }
431
432 curlm = curl_multi_init();
433 if (curlm == NULL) {
434 fprintf(stderr, "Error creating curl multi handle.\n");
435 exit(1);
436 }
437 #endif
438
439 if (getenv("GIT_SSL_NO_VERIFY"))
440 curl_ssl_verify = 0;
441
442 set_from_env(&ssl_cert, "GIT_SSL_CERT");
443 #if LIBCURL_VERSION_NUM >= 0x070903
444 set_from_env(&ssl_key, "GIT_SSL_KEY");
445 #endif
446 #if LIBCURL_VERSION_NUM >= 0x070908
447 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
448 #endif
449 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
450
451 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
452
453 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
454 if (low_speed_limit != NULL)
455 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
456 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
457 if (low_speed_time != NULL)
458 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
459
460 if (curl_ssl_verify == -1)
461 curl_ssl_verify = 1;
462
463 curl_session_count = 0;
464 #ifdef USE_CURL_MULTI
465 if (max_requests < 1)
466 max_requests = DEFAULT_MAX_REQUESTS;
467 #endif
468
469 if (getenv("GIT_CURL_FTP_NO_EPSV"))
470 curl_ftp_no_epsv = 1;
471
472 if (url) {
473 credential_from_url(&http_auth, url);
474 if (!ssl_cert_password_required &&
475 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
476 starts_with(url, "https://"))
477 ssl_cert_password_required = 1;
478 }
479
480 #ifndef NO_CURL_EASY_DUPHANDLE
481 curl_default = get_curl_handle();
482 #endif
483 }
484
485 void http_cleanup(void)
486 {
487 struct active_request_slot *slot = active_queue_head;
488
489 while (slot != NULL) {
490 struct active_request_slot *next = slot->next;
491 if (slot->curl != NULL) {
492 #ifdef USE_CURL_MULTI
493 curl_multi_remove_handle(curlm, slot->curl);
494 #endif
495 curl_easy_cleanup(slot->curl);
496 }
497 free(slot);
498 slot = next;
499 }
500 active_queue_head = NULL;
501
502 #ifndef NO_CURL_EASY_DUPHANDLE
503 curl_easy_cleanup(curl_default);
504 #endif
505
506 #ifdef USE_CURL_MULTI
507 curl_multi_cleanup(curlm);
508 #endif
509 curl_global_cleanup();
510
511 curl_slist_free_all(pragma_header);
512 pragma_header = NULL;
513
514 curl_slist_free_all(no_pragma_header);
515 no_pragma_header = NULL;
516
517 if (curl_http_proxy) {
518 free((void *)curl_http_proxy);
519 curl_http_proxy = NULL;
520 }
521
522 if (cert_auth.password != NULL) {
523 memset(cert_auth.password, 0, strlen(cert_auth.password));
524 free(cert_auth.password);
525 cert_auth.password = NULL;
526 }
527 ssl_cert_password_required = 0;
528 }
529
530 struct active_request_slot *get_active_slot(void)
531 {
532 struct active_request_slot *slot = active_queue_head;
533 struct active_request_slot *newslot;
534
535 #ifdef USE_CURL_MULTI
536 int num_transfers;
537
538 /* Wait for a slot to open up if the queue is full */
539 while (active_requests >= max_requests) {
540 curl_multi_perform(curlm, &num_transfers);
541 if (num_transfers < active_requests)
542 process_curl_messages();
543 }
544 #endif
545
546 while (slot != NULL && slot->in_use)
547 slot = slot->next;
548
549 if (slot == NULL) {
550 newslot = xmalloc(sizeof(*newslot));
551 newslot->curl = NULL;
552 newslot->in_use = 0;
553 newslot->next = NULL;
554
555 slot = active_queue_head;
556 if (slot == NULL) {
557 active_queue_head = newslot;
558 } else {
559 while (slot->next != NULL)
560 slot = slot->next;
561 slot->next = newslot;
562 }
563 slot = newslot;
564 }
565
566 if (slot->curl == NULL) {
567 #ifdef NO_CURL_EASY_DUPHANDLE
568 slot->curl = get_curl_handle();
569 #else
570 slot->curl = curl_easy_duphandle(curl_default);
571 #endif
572 curl_session_count++;
573 }
574
575 active_requests++;
576 slot->in_use = 1;
577 slot->results = NULL;
578 slot->finished = NULL;
579 slot->callback_data = NULL;
580 slot->callback_func = NULL;
581 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
582 if (curl_save_cookies)
583 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
584 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
585 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
586 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
587 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
588 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
589 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
590 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
591 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
592 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
593 if (http_auth.password)
594 init_curl_http_auth(slot->curl);
595
596 return slot;
597 }
598
599 int start_active_slot(struct active_request_slot *slot)
600 {
601 #ifdef USE_CURL_MULTI
602 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
603 int num_transfers;
604
605 if (curlm_result != CURLM_OK &&
606 curlm_result != CURLM_CALL_MULTI_PERFORM) {
607 active_requests--;
608 slot->in_use = 0;
609 return 0;
610 }
611
612 /*
613 * We know there must be something to do, since we just added
614 * something.
615 */
616 curl_multi_perform(curlm, &num_transfers);
617 #endif
618 return 1;
619 }
620
621 #ifdef USE_CURL_MULTI
622 struct fill_chain {
623 void *data;
624 int (*fill)(void *);
625 struct fill_chain *next;
626 };
627
628 static struct fill_chain *fill_cfg;
629
630 void add_fill_function(void *data, int (*fill)(void *))
631 {
632 struct fill_chain *new = xmalloc(sizeof(*new));
633 struct fill_chain **linkp = &fill_cfg;
634 new->data = data;
635 new->fill = fill;
636 new->next = NULL;
637 while (*linkp)
638 linkp = &(*linkp)->next;
639 *linkp = new;
640 }
641
642 void fill_active_slots(void)
643 {
644 struct active_request_slot *slot = active_queue_head;
645
646 while (active_requests < max_requests) {
647 struct fill_chain *fill;
648 for (fill = fill_cfg; fill; fill = fill->next)
649 if (fill->fill(fill->data))
650 break;
651
652 if (!fill)
653 break;
654 }
655
656 while (slot != NULL) {
657 if (!slot->in_use && slot->curl != NULL
658 && curl_session_count > min_curl_sessions) {
659 curl_easy_cleanup(slot->curl);
660 slot->curl = NULL;
661 curl_session_count--;
662 }
663 slot = slot->next;
664 }
665 }
666
667 void step_active_slots(void)
668 {
669 int num_transfers;
670 CURLMcode curlm_result;
671
672 do {
673 curlm_result = curl_multi_perform(curlm, &num_transfers);
674 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
675 if (num_transfers < active_requests) {
676 process_curl_messages();
677 fill_active_slots();
678 }
679 }
680 #endif
681
682 void run_active_slot(struct active_request_slot *slot)
683 {
684 #ifdef USE_CURL_MULTI
685 fd_set readfds;
686 fd_set writefds;
687 fd_set excfds;
688 int max_fd;
689 struct timeval select_timeout;
690 int finished = 0;
691
692 slot->finished = &finished;
693 while (!finished) {
694 step_active_slots();
695
696 if (slot->in_use) {
697 #if LIBCURL_VERSION_NUM >= 0x070f04
698 long curl_timeout;
699 curl_multi_timeout(curlm, &curl_timeout);
700 if (curl_timeout == 0) {
701 continue;
702 } else if (curl_timeout == -1) {
703 select_timeout.tv_sec = 0;
704 select_timeout.tv_usec = 50000;
705 } else {
706 select_timeout.tv_sec = curl_timeout / 1000;
707 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
708 }
709 #else
710 select_timeout.tv_sec = 0;
711 select_timeout.tv_usec = 50000;
712 #endif
713
714 max_fd = -1;
715 FD_ZERO(&readfds);
716 FD_ZERO(&writefds);
717 FD_ZERO(&excfds);
718 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
719
720 /*
721 * It can happen that curl_multi_timeout returns a pathologically
722 * long timeout when curl_multi_fdset returns no file descriptors
723 * to read. See commit message for more details.
724 */
725 if (max_fd < 0 &&
726 (select_timeout.tv_sec > 0 ||
727 select_timeout.tv_usec > 50000)) {
728 select_timeout.tv_sec = 0;
729 select_timeout.tv_usec = 50000;
730 }
731
732 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
733 }
734 }
735 #else
736 while (slot->in_use) {
737 slot->curl_result = curl_easy_perform(slot->curl);
738 finish_active_slot(slot);
739 }
740 #endif
741 }
742
743 static void closedown_active_slot(struct active_request_slot *slot)
744 {
745 active_requests--;
746 slot->in_use = 0;
747 }
748
749 static void release_active_slot(struct active_request_slot *slot)
750 {
751 closedown_active_slot(slot);
752 if (slot->curl && curl_session_count > min_curl_sessions) {
753 #ifdef USE_CURL_MULTI
754 curl_multi_remove_handle(curlm, slot->curl);
755 #endif
756 curl_easy_cleanup(slot->curl);
757 slot->curl = NULL;
758 curl_session_count--;
759 }
760 #ifdef USE_CURL_MULTI
761 fill_active_slots();
762 #endif
763 }
764
765 void finish_active_slot(struct active_request_slot *slot)
766 {
767 closedown_active_slot(slot);
768 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
769
770 if (slot->finished != NULL)
771 (*slot->finished) = 1;
772
773 /* Store slot results so they can be read after the slot is reused */
774 if (slot->results != NULL) {
775 slot->results->curl_result = slot->curl_result;
776 slot->results->http_code = slot->http_code;
777 #if LIBCURL_VERSION_NUM >= 0x070a08
778 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
779 &slot->results->auth_avail);
780 #else
781 slot->results->auth_avail = 0;
782 #endif
783 }
784
785 /* Run callback if appropriate */
786 if (slot->callback_func != NULL)
787 slot->callback_func(slot->callback_data);
788 }
789
790 void finish_all_active_slots(void)
791 {
792 struct active_request_slot *slot = active_queue_head;
793
794 while (slot != NULL)
795 if (slot->in_use) {
796 run_active_slot(slot);
797 slot = active_queue_head;
798 } else {
799 slot = slot->next;
800 }
801 }
802
803 /* Helpers for modifying and creating URLs */
804 static inline int needs_quote(int ch)
805 {
806 if (((ch >= 'A') && (ch <= 'Z'))
807 || ((ch >= 'a') && (ch <= 'z'))
808 || ((ch >= '0') && (ch <= '9'))
809 || (ch == '/')
810 || (ch == '-')
811 || (ch == '.'))
812 return 0;
813 return 1;
814 }
815
816 static char *quote_ref_url(const char *base, const char *ref)
817 {
818 struct strbuf buf = STRBUF_INIT;
819 const char *cp;
820 int ch;
821
822 end_url_with_slash(&buf, base);
823
824 for (cp = ref; (ch = *cp) != 0; cp++)
825 if (needs_quote(ch))
826 strbuf_addf(&buf, "%%%02x", ch);
827 else
828 strbuf_addch(&buf, *cp);
829
830 return strbuf_detach(&buf, NULL);
831 }
832
833 void append_remote_object_url(struct strbuf *buf, const char *url,
834 const char *hex,
835 int only_two_digit_prefix)
836 {
837 end_url_with_slash(buf, url);
838
839 strbuf_addf(buf, "objects/%.*s/", 2, hex);
840 if (!only_two_digit_prefix)
841 strbuf_addf(buf, "%s", hex+2);
842 }
843
844 char *get_remote_object_url(const char *url, const char *hex,
845 int only_two_digit_prefix)
846 {
847 struct strbuf buf = STRBUF_INIT;
848 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
849 return strbuf_detach(&buf, NULL);
850 }
851
852 int handle_curl_result(struct slot_results *results)
853 {
854 /*
855 * If we see a failing http code with CURLE_OK, we have turned off
856 * FAILONERROR (to keep the server's custom error response), and should
857 * translate the code into failure here.
858 */
859 if (results->curl_result == CURLE_OK &&
860 results->http_code >= 400) {
861 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
862 /*
863 * Normally curl will already have put the "reason phrase"
864 * from the server into curl_errorstr; unfortunately without
865 * FAILONERROR it is lost, so we can give only the numeric
866 * status code.
867 */
868 snprintf(curl_errorstr, sizeof(curl_errorstr),
869 "The requested URL returned error: %ld",
870 results->http_code);
871 }
872
873 if (results->curl_result == CURLE_OK) {
874 credential_approve(&http_auth);
875 return HTTP_OK;
876 } else if (missing_target(results))
877 return HTTP_MISSING_TARGET;
878 else if (results->http_code == 401) {
879 if (http_auth.username && http_auth.password) {
880 credential_reject(&http_auth);
881 return HTTP_NOAUTH;
882 } else {
883 return HTTP_REAUTH;
884 }
885 } else {
886 #if LIBCURL_VERSION_NUM >= 0x070c00
887 if (!curl_errorstr[0])
888 strlcpy(curl_errorstr,
889 curl_easy_strerror(results->curl_result),
890 sizeof(curl_errorstr));
891 #endif
892 return HTTP_ERROR;
893 }
894 }
895
896 int run_one_slot(struct active_request_slot *slot,
897 struct slot_results *results)
898 {
899 slot->results = results;
900 if (!start_active_slot(slot)) {
901 snprintf(curl_errorstr, sizeof(curl_errorstr),
902 "failed to start HTTP request");
903 return HTTP_START_FAILED;
904 }
905
906 run_active_slot(slot);
907 return handle_curl_result(results);
908 }
909
910 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
911 {
912 char *ptr;
913 CURLcode ret;
914
915 strbuf_reset(buf);
916 ret = curl_easy_getinfo(curl, info, &ptr);
917 if (!ret && ptr)
918 strbuf_addstr(buf, ptr);
919 return ret;
920 }
921
922 /* http_request() targets */
923 #define HTTP_REQUEST_STRBUF 0
924 #define HTTP_REQUEST_FILE 1
925
926 static int http_request(const char *url,
927 void *result, int target,
928 const struct http_get_options *options)
929 {
930 struct active_request_slot *slot;
931 struct slot_results results;
932 struct curl_slist *headers = NULL;
933 struct strbuf buf = STRBUF_INIT;
934 int ret;
935
936 slot = get_active_slot();
937 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
938
939 if (result == NULL) {
940 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
941 } else {
942 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
943 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
944
945 if (target == HTTP_REQUEST_FILE) {
946 long posn = ftell(result);
947 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
948 fwrite);
949 if (posn > 0) {
950 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
951 headers = curl_slist_append(headers, buf.buf);
952 strbuf_reset(&buf);
953 }
954 } else
955 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
956 fwrite_buffer);
957 }
958
959 strbuf_addstr(&buf, "Pragma:");
960 if (options && options->no_cache)
961 strbuf_addstr(&buf, " no-cache");
962 if (options && options->keep_error)
963 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
964
965 headers = curl_slist_append(headers, buf.buf);
966
967 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
968 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
969 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
970
971 ret = run_one_slot(slot, &results);
972
973 if (options && options->content_type)
974 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE,
975 options->content_type);
976
977 if (options && options->effective_url)
978 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
979 options->effective_url);
980
981 curl_slist_free_all(headers);
982 strbuf_release(&buf);
983
984 return ret;
985 }
986
987 /*
988 * Update the "base" url to a more appropriate value, as deduced by
989 * redirects seen when requesting a URL starting with "url".
990 *
991 * The "asked" parameter is a URL that we asked curl to access, and must begin
992 * with "base".
993 *
994 * The "got" parameter is the URL that curl reported to us as where we ended
995 * up.
996 *
997 * Returns 1 if we updated the base url, 0 otherwise.
998 *
999 * Our basic strategy is to compare "base" and "asked" to find the bits
1000 * specific to our request. We then strip those bits off of "got" to yield the
1001 * new base. So for example, if our base is "http://example.com/foo.git",
1002 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1003 * with "https://other.example.com/foo.git/info/refs". We would want the
1004 * new URL to become "https://other.example.com/foo.git".
1005 *
1006 * Note that this assumes a sane redirect scheme. It's entirely possible
1007 * in the example above to end up at a URL that does not even end in
1008 * "info/refs". In such a case we simply punt, as there is not much we can
1009 * do (and such a scheme is unlikely to represent a real git repository,
1010 * which means we are likely about to abort anyway).
1011 */
1012 static int update_url_from_redirect(struct strbuf *base,
1013 const char *asked,
1014 const struct strbuf *got)
1015 {
1016 const char *tail;
1017 size_t tail_len;
1018
1019 if (!strcmp(asked, got->buf))
1020 return 0;
1021
1022 if (!starts_with(asked, base->buf))
1023 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1024 asked, base->buf);
1025
1026 tail = asked + base->len;
1027 tail_len = strlen(tail);
1028
1029 if (got->len < tail_len ||
1030 strcmp(tail, got->buf + got->len - tail_len))
1031 return 0; /* insane redirect scheme */
1032
1033 strbuf_reset(base);
1034 strbuf_add(base, got->buf, got->len - tail_len);
1035 return 1;
1036 }
1037
1038 static int http_request_reauth(const char *url,
1039 void *result, int target,
1040 struct http_get_options *options)
1041 {
1042 int ret = http_request(url, result, target, options);
1043
1044 if (options && options->effective_url && options->base_url) {
1045 if (update_url_from_redirect(options->base_url,
1046 url, options->effective_url)) {
1047 credential_from_url(&http_auth, options->base_url->buf);
1048 url = options->effective_url->buf;
1049 }
1050 }
1051
1052 if (ret != HTTP_REAUTH)
1053 return ret;
1054
1055 /*
1056 * If we are using KEEP_ERROR, the previous request may have
1057 * put cruft into our output stream; we should clear it out before
1058 * making our next request. We only know how to do this for
1059 * the strbuf case, but that is enough to satisfy current callers.
1060 */
1061 if (options && options->keep_error) {
1062 switch (target) {
1063 case HTTP_REQUEST_STRBUF:
1064 strbuf_reset(result);
1065 break;
1066 default:
1067 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1068 }
1069 }
1070
1071 credential_fill(&http_auth);
1072
1073 return http_request(url, result, target, options);
1074 }
1075
1076 int http_get_strbuf(const char *url,
1077 struct strbuf *result,
1078 struct http_get_options *options)
1079 {
1080 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1081 }
1082
1083 /*
1084 * Downloads a URL and stores the result in the given file.
1085 *
1086 * If a previous interrupted download is detected (i.e. a previous temporary
1087 * file is still around) the download is resumed.
1088 */
1089 static int http_get_file(const char *url, const char *filename,
1090 struct http_get_options *options)
1091 {
1092 int ret;
1093 struct strbuf tmpfile = STRBUF_INIT;
1094 FILE *result;
1095
1096 strbuf_addf(&tmpfile, "%s.temp", filename);
1097 result = fopen(tmpfile.buf, "a");
1098 if (!result) {
1099 error("Unable to open local file %s", tmpfile.buf);
1100 ret = HTTP_ERROR;
1101 goto cleanup;
1102 }
1103
1104 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1105 fclose(result);
1106
1107 if (ret == HTTP_OK && move_temp_to_file(tmpfile.buf, filename))
1108 ret = HTTP_ERROR;
1109 cleanup:
1110 strbuf_release(&tmpfile);
1111 return ret;
1112 }
1113
1114 int http_fetch_ref(const char *base, struct ref *ref)
1115 {
1116 struct http_get_options options = {0};
1117 char *url;
1118 struct strbuf buffer = STRBUF_INIT;
1119 int ret = -1;
1120
1121 options.no_cache = 1;
1122
1123 url = quote_ref_url(base, ref->name);
1124 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1125 strbuf_rtrim(&buffer);
1126 if (buffer.len == 40)
1127 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1128 else if (starts_with(buffer.buf, "ref: ")) {
1129 ref->symref = xstrdup(buffer.buf + 5);
1130 ret = 0;
1131 }
1132 }
1133
1134 strbuf_release(&buffer);
1135 free(url);
1136 return ret;
1137 }
1138
1139 /* Helpers for fetching packs */
1140 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1141 {
1142 char *url, *tmp;
1143 struct strbuf buf = STRBUF_INIT;
1144
1145 if (http_is_verbose)
1146 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1147
1148 end_url_with_slash(&buf, base_url);
1149 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1150 url = strbuf_detach(&buf, NULL);
1151
1152 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1153 tmp = strbuf_detach(&buf, NULL);
1154
1155 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1156 error("Unable to get pack index %s", url);
1157 free(tmp);
1158 tmp = NULL;
1159 }
1160
1161 free(url);
1162 return tmp;
1163 }
1164
1165 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1166 unsigned char *sha1, const char *base_url)
1167 {
1168 struct packed_git *new_pack;
1169 char *tmp_idx = NULL;
1170 int ret;
1171
1172 if (has_pack_index(sha1)) {
1173 new_pack = parse_pack_index(sha1, NULL);
1174 if (!new_pack)
1175 return -1; /* parse_pack_index() already issued error message */
1176 goto add_pack;
1177 }
1178
1179 tmp_idx = fetch_pack_index(sha1, base_url);
1180 if (!tmp_idx)
1181 return -1;
1182
1183 new_pack = parse_pack_index(sha1, tmp_idx);
1184 if (!new_pack) {
1185 unlink(tmp_idx);
1186 free(tmp_idx);
1187
1188 return -1; /* parse_pack_index() already issued error message */
1189 }
1190
1191 ret = verify_pack_index(new_pack);
1192 if (!ret) {
1193 close_pack_index(new_pack);
1194 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1195 }
1196 free(tmp_idx);
1197 if (ret)
1198 return -1;
1199
1200 add_pack:
1201 new_pack->next = *packs_head;
1202 *packs_head = new_pack;
1203 return 0;
1204 }
1205
1206 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1207 {
1208 struct http_get_options options = {0};
1209 int ret = 0, i = 0;
1210 char *url, *data;
1211 struct strbuf buf = STRBUF_INIT;
1212 unsigned char sha1[20];
1213
1214 end_url_with_slash(&buf, base_url);
1215 strbuf_addstr(&buf, "objects/info/packs");
1216 url = strbuf_detach(&buf, NULL);
1217
1218 options.no_cache = 1;
1219 ret = http_get_strbuf(url, &buf, &options);
1220 if (ret != HTTP_OK)
1221 goto cleanup;
1222
1223 data = buf.buf;
1224 while (i < buf.len) {
1225 switch (data[i]) {
1226 case 'P':
1227 i++;
1228 if (i + 52 <= buf.len &&
1229 starts_with(data + i, " pack-") &&
1230 starts_with(data + i + 46, ".pack\n")) {
1231 get_sha1_hex(data + i + 6, sha1);
1232 fetch_and_setup_pack_index(packs_head, sha1,
1233 base_url);
1234 i += 51;
1235 break;
1236 }
1237 default:
1238 while (i < buf.len && data[i] != '\n')
1239 i++;
1240 }
1241 i++;
1242 }
1243
1244 cleanup:
1245 free(url);
1246 return ret;
1247 }
1248
1249 void release_http_pack_request(struct http_pack_request *preq)
1250 {
1251 if (preq->packfile != NULL) {
1252 fclose(preq->packfile);
1253 preq->packfile = NULL;
1254 }
1255 if (preq->range_header != NULL) {
1256 curl_slist_free_all(preq->range_header);
1257 preq->range_header = NULL;
1258 }
1259 preq->slot = NULL;
1260 free(preq->url);
1261 }
1262
1263 int finish_http_pack_request(struct http_pack_request *preq)
1264 {
1265 struct packed_git **lst;
1266 struct packed_git *p = preq->target;
1267 char *tmp_idx;
1268 struct child_process ip;
1269 const char *ip_argv[8];
1270
1271 close_pack_index(p);
1272
1273 fclose(preq->packfile);
1274 preq->packfile = NULL;
1275
1276 lst = preq->lst;
1277 while (*lst != p)
1278 lst = &((*lst)->next);
1279 *lst = (*lst)->next;
1280
1281 tmp_idx = xstrdup(preq->tmpfile);
1282 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1283 ".idx.temp");
1284
1285 ip_argv[0] = "index-pack";
1286 ip_argv[1] = "-o";
1287 ip_argv[2] = tmp_idx;
1288 ip_argv[3] = preq->tmpfile;
1289 ip_argv[4] = NULL;
1290
1291 memset(&ip, 0, sizeof(ip));
1292 ip.argv = ip_argv;
1293 ip.git_cmd = 1;
1294 ip.no_stdin = 1;
1295 ip.no_stdout = 1;
1296
1297 if (run_command(&ip)) {
1298 unlink(preq->tmpfile);
1299 unlink(tmp_idx);
1300 free(tmp_idx);
1301 return -1;
1302 }
1303
1304 unlink(sha1_pack_index_name(p->sha1));
1305
1306 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1307 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1308 free(tmp_idx);
1309 return -1;
1310 }
1311
1312 install_packed_git(p);
1313 free(tmp_idx);
1314 return 0;
1315 }
1316
1317 struct http_pack_request *new_http_pack_request(
1318 struct packed_git *target, const char *base_url)
1319 {
1320 long prev_posn = 0;
1321 char range[RANGE_HEADER_SIZE];
1322 struct strbuf buf = STRBUF_INIT;
1323 struct http_pack_request *preq;
1324
1325 preq = xcalloc(1, sizeof(*preq));
1326 preq->target = target;
1327
1328 end_url_with_slash(&buf, base_url);
1329 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1330 sha1_to_hex(target->sha1));
1331 preq->url = strbuf_detach(&buf, NULL);
1332
1333 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1334 sha1_pack_name(target->sha1));
1335 preq->packfile = fopen(preq->tmpfile, "a");
1336 if (!preq->packfile) {
1337 error("Unable to open local file %s for pack",
1338 preq->tmpfile);
1339 goto abort;
1340 }
1341
1342 preq->slot = get_active_slot();
1343 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1344 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1345 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1346 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1347 no_pragma_header);
1348
1349 /*
1350 * If there is data present from a previous transfer attempt,
1351 * resume where it left off
1352 */
1353 prev_posn = ftell(preq->packfile);
1354 if (prev_posn>0) {
1355 if (http_is_verbose)
1356 fprintf(stderr,
1357 "Resuming fetch of pack %s at byte %ld\n",
1358 sha1_to_hex(target->sha1), prev_posn);
1359 sprintf(range, "Range: bytes=%ld-", prev_posn);
1360 preq->range_header = curl_slist_append(NULL, range);
1361 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1362 preq->range_header);
1363 }
1364
1365 return preq;
1366
1367 abort:
1368 free(preq->url);
1369 free(preq);
1370 return NULL;
1371 }
1372
1373 /* Helpers for fetching objects (loose) */
1374 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1375 void *data)
1376 {
1377 unsigned char expn[4096];
1378 size_t size = eltsize * nmemb;
1379 int posn = 0;
1380 struct http_object_request *freq =
1381 (struct http_object_request *)data;
1382 do {
1383 ssize_t retval = xwrite(freq->localfile,
1384 (char *) ptr + posn, size - posn);
1385 if (retval < 0)
1386 return posn;
1387 posn += retval;
1388 } while (posn < size);
1389
1390 freq->stream.avail_in = size;
1391 freq->stream.next_in = (void *)ptr;
1392 do {
1393 freq->stream.next_out = expn;
1394 freq->stream.avail_out = sizeof(expn);
1395 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1396 git_SHA1_Update(&freq->c, expn,
1397 sizeof(expn) - freq->stream.avail_out);
1398 } while (freq->stream.avail_in && freq->zret == Z_OK);
1399 return size;
1400 }
1401
1402 struct http_object_request *new_http_object_request(const char *base_url,
1403 unsigned char *sha1)
1404 {
1405 char *hex = sha1_to_hex(sha1);
1406 const char *filename;
1407 char prevfile[PATH_MAX];
1408 int prevlocal;
1409 char prev_buf[PREV_BUF_SIZE];
1410 ssize_t prev_read = 0;
1411 long prev_posn = 0;
1412 char range[RANGE_HEADER_SIZE];
1413 struct curl_slist *range_header = NULL;
1414 struct http_object_request *freq;
1415
1416 freq = xcalloc(1, sizeof(*freq));
1417 hashcpy(freq->sha1, sha1);
1418 freq->localfile = -1;
1419
1420 filename = sha1_file_name(sha1);
1421 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1422 "%s.temp", filename);
1423
1424 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1425 unlink_or_warn(prevfile);
1426 rename(freq->tmpfile, prevfile);
1427 unlink_or_warn(freq->tmpfile);
1428
1429 if (freq->localfile != -1)
1430 error("fd leakage in start: %d", freq->localfile);
1431 freq->localfile = open(freq->tmpfile,
1432 O_WRONLY | O_CREAT | O_EXCL, 0666);
1433 /*
1434 * This could have failed due to the "lazy directory creation";
1435 * try to mkdir the last path component.
1436 */
1437 if (freq->localfile < 0 && errno == ENOENT) {
1438 char *dir = strrchr(freq->tmpfile, '/');
1439 if (dir) {
1440 *dir = 0;
1441 mkdir(freq->tmpfile, 0777);
1442 *dir = '/';
1443 }
1444 freq->localfile = open(freq->tmpfile,
1445 O_WRONLY | O_CREAT | O_EXCL, 0666);
1446 }
1447
1448 if (freq->localfile < 0) {
1449 error("Couldn't create temporary file %s: %s",
1450 freq->tmpfile, strerror(errno));
1451 goto abort;
1452 }
1453
1454 git_inflate_init(&freq->stream);
1455
1456 git_SHA1_Init(&freq->c);
1457
1458 freq->url = get_remote_object_url(base_url, hex, 0);
1459
1460 /*
1461 * If a previous temp file is present, process what was already
1462 * fetched.
1463 */
1464 prevlocal = open(prevfile, O_RDONLY);
1465 if (prevlocal != -1) {
1466 do {
1467 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1468 if (prev_read>0) {
1469 if (fwrite_sha1_file(prev_buf,
1470 1,
1471 prev_read,
1472 freq) == prev_read) {
1473 prev_posn += prev_read;
1474 } else {
1475 prev_read = -1;
1476 }
1477 }
1478 } while (prev_read > 0);
1479 close(prevlocal);
1480 }
1481 unlink_or_warn(prevfile);
1482
1483 /*
1484 * Reset inflate/SHA1 if there was an error reading the previous temp
1485 * file; also rewind to the beginning of the local file.
1486 */
1487 if (prev_read == -1) {
1488 memset(&freq->stream, 0, sizeof(freq->stream));
1489 git_inflate_init(&freq->stream);
1490 git_SHA1_Init(&freq->c);
1491 if (prev_posn>0) {
1492 prev_posn = 0;
1493 lseek(freq->localfile, 0, SEEK_SET);
1494 if (ftruncate(freq->localfile, 0) < 0) {
1495 error("Couldn't truncate temporary file %s: %s",
1496 freq->tmpfile, strerror(errno));
1497 goto abort;
1498 }
1499 }
1500 }
1501
1502 freq->slot = get_active_slot();
1503
1504 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1505 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1506 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1507 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1508 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1509
1510 /*
1511 * If we have successfully processed data from a previous fetch
1512 * attempt, only fetch the data we don't already have.
1513 */
1514 if (prev_posn>0) {
1515 if (http_is_verbose)
1516 fprintf(stderr,
1517 "Resuming fetch of object %s at byte %ld\n",
1518 hex, prev_posn);
1519 sprintf(range, "Range: bytes=%ld-", prev_posn);
1520 range_header = curl_slist_append(range_header, range);
1521 curl_easy_setopt(freq->slot->curl,
1522 CURLOPT_HTTPHEADER, range_header);
1523 }
1524
1525 return freq;
1526
1527 abort:
1528 free(freq->url);
1529 free(freq);
1530 return NULL;
1531 }
1532
1533 void process_http_object_request(struct http_object_request *freq)
1534 {
1535 if (freq->slot == NULL)
1536 return;
1537 freq->curl_result = freq->slot->curl_result;
1538 freq->http_code = freq->slot->http_code;
1539 freq->slot = NULL;
1540 }
1541
1542 int finish_http_object_request(struct http_object_request *freq)
1543 {
1544 struct stat st;
1545
1546 close(freq->localfile);
1547 freq->localfile = -1;
1548
1549 process_http_object_request(freq);
1550
1551 if (freq->http_code == 416) {
1552 warning("requested range invalid; we may already have all the data.");
1553 } else if (freq->curl_result != CURLE_OK) {
1554 if (stat(freq->tmpfile, &st) == 0)
1555 if (st.st_size == 0)
1556 unlink_or_warn(freq->tmpfile);
1557 return -1;
1558 }
1559
1560 git_inflate_end(&freq->stream);
1561 git_SHA1_Final(freq->real_sha1, &freq->c);
1562 if (freq->zret != Z_STREAM_END) {
1563 unlink_or_warn(freq->tmpfile);
1564 return -1;
1565 }
1566 if (hashcmp(freq->sha1, freq->real_sha1)) {
1567 unlink_or_warn(freq->tmpfile);
1568 return -1;
1569 }
1570 freq->rename =
1571 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1572
1573 return freq->rename;
1574 }
1575
1576 void abort_http_object_request(struct http_object_request *freq)
1577 {
1578 unlink_or_warn(freq->tmpfile);
1579
1580 release_http_object_request(freq);
1581 }
1582
1583 void release_http_object_request(struct http_object_request *freq)
1584 {
1585 if (freq->localfile != -1) {
1586 close(freq->localfile);
1587 freq->localfile = -1;
1588 }
1589 if (freq->url != NULL) {
1590 free(freq->url);
1591 freq->url = NULL;
1592 }
1593 if (freq->slot != NULL) {
1594 freq->slot->callback_func = NULL;
1595 freq->slot->callback_data = NULL;
1596 release_active_slot(freq->slot);
1597 freq->slot = NULL;
1598 }
1599 }
The MinGW fork, forked for msysGit