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