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Merge branch 'ef/mingw-syslog'
[git/debian.git] / http.c
blobfb3465f50c95ab9cb3e6fae1d1e594f6ae0b9c42
1 #include "http.h"
2 #include "pack.h"
3 #include "sideband.h"
4 #include "run-command.h"
5 #include "url.h"
6
7 int data_received;
8 int active_requests;
9 int http_is_verbose;
10 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
11
12 #if LIBCURL_VERSION_NUM >= 0x070a06
13 #define LIBCURL_CAN_HANDLE_AUTH_ANY
14 #endif
15
16 static int min_curl_sessions = 1;
17 static int curl_session_count;
18 #ifdef USE_CURL_MULTI
19 static int max_requests = -1;
20 static CURLM *curlm;
21 #endif
22 #ifndef NO_CURL_EASY_DUPHANDLE
23 static CURL *curl_default;
24 #endif
25
26 #define PREV_BUF_SIZE 4096
27 #define RANGE_HEADER_SIZE 30
28
29 char curl_errorstr[CURL_ERROR_SIZE];
30
31 static int curl_ssl_verify = -1;
32 static const char *ssl_cert;
33 #if LIBCURL_VERSION_NUM >= 0x070903
34 static const char *ssl_key;
35 #endif
36 #if LIBCURL_VERSION_NUM >= 0x070908
37 static const char *ssl_capath;
38 #endif
39 static const char *ssl_cainfo;
40 static long curl_low_speed_limit = -1;
41 static long curl_low_speed_time = -1;
42 static int curl_ftp_no_epsv;
43 static const char *curl_http_proxy;
44 static const char *curl_cookie_file;
45 static char *user_name, *user_pass;
46 static const char *user_agent;
47
48 #if LIBCURL_VERSION_NUM >= 0x071700
49 /* Use CURLOPT_KEYPASSWD as is */
50 #elif LIBCURL_VERSION_NUM >= 0x070903
51 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
52 #else
53 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
54 #endif
55
56 static char *ssl_cert_password;
57 static int ssl_cert_password_required;
58
59 static struct curl_slist *pragma_header;
60 static struct curl_slist *no_pragma_header;
61
62 static struct active_request_slot *active_queue_head;
63
64 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
65 {
66 size_t size = eltsize * nmemb;
67 struct buffer *buffer = buffer_;
68
69 if (size > buffer->buf.len - buffer->posn)
70 size = buffer->buf.len - buffer->posn;
71 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
72 buffer->posn += size;
73
74 return size;
75 }
76
77 #ifndef NO_CURL_IOCTL
78 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
79 {
80 struct buffer *buffer = clientp;
81
82 switch (cmd) {
83 case CURLIOCMD_NOP:
84 return CURLIOE_OK;
85
86 case CURLIOCMD_RESTARTREAD:
87 buffer->posn = 0;
88 return CURLIOE_OK;
89
90 default:
91 return CURLIOE_UNKNOWNCMD;
92 }
93 }
94 #endif
95
96 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
97 {
98 size_t size = eltsize * nmemb;
99 struct strbuf *buffer = buffer_;
100
101 strbuf_add(buffer, ptr, size);
102 data_received++;
103 return size;
104 }
105
106 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
107 {
108 data_received++;
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 (user_name) {
215 struct strbuf up = STRBUF_INIT;
216 if (!user_pass)
217 user_pass = xstrdup(git_getpass("Password: "));
218 strbuf_addf(&up, "%s:%s", user_name, user_pass);
219 curl_easy_setopt(result, CURLOPT_USERPWD,
220 strbuf_detach(&up, NULL));
221 }
222 }
223
224 static int has_cert_password(void)
225 {
226 if (ssl_cert_password != NULL)
227 return 1;
228 if (ssl_cert == NULL || ssl_cert_password_required != 1)
229 return 0;
230 /* Only prompt the user once. */
231 ssl_cert_password_required = -1;
232 ssl_cert_password = git_getpass("Certificate Password: ");
233 if (ssl_cert_password != NULL) {
234 ssl_cert_password = xstrdup(ssl_cert_password);
235 return 1;
236 } else
237 return 0;
238 }
239
240 static CURL *get_curl_handle(void)
241 {
242 CURL *result = curl_easy_init();
243
244 if (!curl_ssl_verify) {
245 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
246 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
247 } else {
248 /* Verify authenticity of the peer's certificate */
249 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
250 /* The name in the cert must match whom we tried to connect */
251 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
252 }
253
254 #if LIBCURL_VERSION_NUM >= 0x070907
255 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
256 #endif
257 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
258 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
259 #endif
260
261 init_curl_http_auth(result);
262
263 if (ssl_cert != NULL)
264 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
265 if (has_cert_password())
266 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
267 #if LIBCURL_VERSION_NUM >= 0x070903
268 if (ssl_key != NULL)
269 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
270 #endif
271 #if LIBCURL_VERSION_NUM >= 0x070908
272 if (ssl_capath != NULL)
273 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
274 #endif
275 if (ssl_cainfo != NULL)
276 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
277 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
278
279 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
280 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
281 curl_low_speed_limit);
282 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
283 curl_low_speed_time);
284 }
285
286 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
287 #if LIBCURL_VERSION_NUM >= 0x071301
288 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
289 #elif LIBCURL_VERSION_NUM >= 0x071101
290 curl_easy_setopt(result, CURLOPT_POST301, 1);
291 #endif
292
293 if (getenv("GIT_CURL_VERBOSE"))
294 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
295
296 curl_easy_setopt(result, CURLOPT_USERAGENT,
297 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
298
299 if (curl_ftp_no_epsv)
300 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
301
302 if (curl_http_proxy)
303 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
304
305 return result;
306 }
307
308 static void http_auth_init(const char *url)
309 {
310 char *at, *colon, *cp, *slash, *decoded;
311 int len;
312
313 cp = strstr(url, "://");
314 if (!cp)
315 return;
316
317 /*
318 * Ok, the URL looks like "proto://something". Which one?
319 * "proto://<user>:<pass>@<host>/...",
320 * "proto://<user>@<host>/...", or just
321 * "proto://<host>/..."?
322 */
323 cp += 3;
324 at = strchr(cp, '@');
325 colon = strchr(cp, ':');
326 slash = strchrnul(cp, '/');
327 if (!at || slash <= at)
328 return; /* No credentials */
329 if (!colon || at <= colon) {
330 /* Only username */
331 len = at - cp;
332 user_name = xmalloc(len + 1);
333 memcpy(user_name, cp, len);
334 user_name[len] = '\0';
335 decoded = url_decode(user_name);
336 free(user_name);
337 user_name = decoded;
338 user_pass = NULL;
339 } else {
340 len = colon - cp;
341 user_name = xmalloc(len + 1);
342 memcpy(user_name, cp, len);
343 user_name[len] = '\0';
344 decoded = url_decode(user_name);
345 free(user_name);
346 user_name = decoded;
347 len = at - (colon + 1);
348 user_pass = xmalloc(len + 1);
349 memcpy(user_pass, colon + 1, len);
350 user_pass[len] = '\0';
351 decoded = url_decode(user_pass);
352 free(user_pass);
353 user_pass = decoded;
354 }
355 }
356
357 static void set_from_env(const char **var, const char *envname)
358 {
359 const char *val = getenv(envname);
360 if (val)
361 *var = val;
362 }
363
364 void http_init(struct remote *remote)
365 {
366 char *low_speed_limit;
367 char *low_speed_time;
368
369 http_is_verbose = 0;
370
371 git_config(http_options, NULL);
372
373 curl_global_init(CURL_GLOBAL_ALL);
374
375 if (remote && remote->http_proxy)
376 curl_http_proxy = xstrdup(remote->http_proxy);
377
378 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
379 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
380
381 #ifdef USE_CURL_MULTI
382 {
383 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
384 if (http_max_requests != NULL)
385 max_requests = atoi(http_max_requests);
386 }
387
388 curlm = curl_multi_init();
389 if (curlm == NULL) {
390 fprintf(stderr, "Error creating curl multi handle.\n");
391 exit(1);
392 }
393 #endif
394
395 if (getenv("GIT_SSL_NO_VERIFY"))
396 curl_ssl_verify = 0;
397
398 set_from_env(&ssl_cert, "GIT_SSL_CERT");
399 #if LIBCURL_VERSION_NUM >= 0x070903
400 set_from_env(&ssl_key, "GIT_SSL_KEY");
401 #endif
402 #if LIBCURL_VERSION_NUM >= 0x070908
403 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
404 #endif
405 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
406
407 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
408
409 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
410 if (low_speed_limit != NULL)
411 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
412 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
413 if (low_speed_time != NULL)
414 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
415
416 if (curl_ssl_verify == -1)
417 curl_ssl_verify = 1;
418
419 curl_session_count = 0;
420 #ifdef USE_CURL_MULTI
421 if (max_requests < 1)
422 max_requests = DEFAULT_MAX_REQUESTS;
423 #endif
424
425 if (getenv("GIT_CURL_FTP_NO_EPSV"))
426 curl_ftp_no_epsv = 1;
427
428 if (remote && remote->url && remote->url[0]) {
429 http_auth_init(remote->url[0]);
430 if (!ssl_cert_password_required &&
431 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
432 !prefixcmp(remote->url[0], "https://"))
433 ssl_cert_password_required = 1;
434 }
435
436 #ifndef NO_CURL_EASY_DUPHANDLE
437 curl_default = get_curl_handle();
438 #endif
439 }
440
441 void http_cleanup(void)
442 {
443 struct active_request_slot *slot = active_queue_head;
444
445 while (slot != NULL) {
446 struct active_request_slot *next = slot->next;
447 if (slot->curl != NULL) {
448 #ifdef USE_CURL_MULTI
449 curl_multi_remove_handle(curlm, slot->curl);
450 #endif
451 curl_easy_cleanup(slot->curl);
452 }
453 free(slot);
454 slot = next;
455 }
456 active_queue_head = NULL;
457
458 #ifndef NO_CURL_EASY_DUPHANDLE
459 curl_easy_cleanup(curl_default);
460 #endif
461
462 #ifdef USE_CURL_MULTI
463 curl_multi_cleanup(curlm);
464 #endif
465 curl_global_cleanup();
466
467 curl_slist_free_all(pragma_header);
468 pragma_header = NULL;
469
470 curl_slist_free_all(no_pragma_header);
471 no_pragma_header = NULL;
472
473 if (curl_http_proxy) {
474 free((void *)curl_http_proxy);
475 curl_http_proxy = NULL;
476 }
477
478 if (ssl_cert_password != NULL) {
479 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
480 free(ssl_cert_password);
481 ssl_cert_password = NULL;
482 }
483 ssl_cert_password_required = 0;
484 }
485
486 struct active_request_slot *get_active_slot(void)
487 {
488 struct active_request_slot *slot = active_queue_head;
489 struct active_request_slot *newslot;
490
491 #ifdef USE_CURL_MULTI
492 int num_transfers;
493
494 /* Wait for a slot to open up if the queue is full */
495 while (active_requests >= max_requests) {
496 curl_multi_perform(curlm, &num_transfers);
497 if (num_transfers < active_requests)
498 process_curl_messages();
499 }
500 #endif
501
502 while (slot != NULL && slot->in_use)
503 slot = slot->next;
504
505 if (slot == NULL) {
506 newslot = xmalloc(sizeof(*newslot));
507 newslot->curl = NULL;
508 newslot->in_use = 0;
509 newslot->next = NULL;
510
511 slot = active_queue_head;
512 if (slot == NULL) {
513 active_queue_head = newslot;
514 } else {
515 while (slot->next != NULL)
516 slot = slot->next;
517 slot->next = newslot;
518 }
519 slot = newslot;
520 }
521
522 if (slot->curl == NULL) {
523 #ifdef NO_CURL_EASY_DUPHANDLE
524 slot->curl = get_curl_handle();
525 #else
526 slot->curl = curl_easy_duphandle(curl_default);
527 #endif
528 curl_session_count++;
529 }
530
531 active_requests++;
532 slot->in_use = 1;
533 slot->local = NULL;
534 slot->results = NULL;
535 slot->finished = NULL;
536 slot->callback_data = NULL;
537 slot->callback_func = NULL;
538 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
539 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
540 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
541 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
542 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
543 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
544 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
545 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
546 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
547
548 return slot;
549 }
550
551 int start_active_slot(struct active_request_slot *slot)
552 {
553 #ifdef USE_CURL_MULTI
554 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
555 int num_transfers;
556
557 if (curlm_result != CURLM_OK &&
558 curlm_result != CURLM_CALL_MULTI_PERFORM) {
559 active_requests--;
560 slot->in_use = 0;
561 return 0;
562 }
563
564 /*
565 * We know there must be something to do, since we just added
566 * something.
567 */
568 curl_multi_perform(curlm, &num_transfers);
569 #endif
570 return 1;
571 }
572
573 #ifdef USE_CURL_MULTI
574 struct fill_chain {
575 void *data;
576 int (*fill)(void *);
577 struct fill_chain *next;
578 };
579
580 static struct fill_chain *fill_cfg;
581
582 void add_fill_function(void *data, int (*fill)(void *))
583 {
584 struct fill_chain *new = xmalloc(sizeof(*new));
585 struct fill_chain **linkp = &fill_cfg;
586 new->data = data;
587 new->fill = fill;
588 new->next = NULL;
589 while (*linkp)
590 linkp = &(*linkp)->next;
591 *linkp = new;
592 }
593
594 void fill_active_slots(void)
595 {
596 struct active_request_slot *slot = active_queue_head;
597
598 while (active_requests < max_requests) {
599 struct fill_chain *fill;
600 for (fill = fill_cfg; fill; fill = fill->next)
601 if (fill->fill(fill->data))
602 break;
603
604 if (!fill)
605 break;
606 }
607
608 while (slot != NULL) {
609 if (!slot->in_use && slot->curl != NULL
610 && curl_session_count > min_curl_sessions) {
611 curl_easy_cleanup(slot->curl);
612 slot->curl = NULL;
613 curl_session_count--;
614 }
615 slot = slot->next;
616 }
617 }
618
619 void step_active_slots(void)
620 {
621 int num_transfers;
622 CURLMcode curlm_result;
623
624 do {
625 curlm_result = curl_multi_perform(curlm, &num_transfers);
626 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
627 if (num_transfers < active_requests) {
628 process_curl_messages();
629 fill_active_slots();
630 }
631 }
632 #endif
633
634 void run_active_slot(struct active_request_slot *slot)
635 {
636 #ifdef USE_CURL_MULTI
637 long last_pos = 0;
638 long current_pos;
639 fd_set readfds;
640 fd_set writefds;
641 fd_set excfds;
642 int max_fd;
643 struct timeval select_timeout;
644 int finished = 0;
645
646 slot->finished = &finished;
647 while (!finished) {
648 data_received = 0;
649 step_active_slots();
650
651 if (!data_received && slot->local != NULL) {
652 current_pos = ftell(slot->local);
653 if (current_pos > last_pos)
654 data_received++;
655 last_pos = current_pos;
656 }
657
658 if (slot->in_use && !data_received) {
659 max_fd = 0;
660 FD_ZERO(&readfds);
661 FD_ZERO(&writefds);
662 FD_ZERO(&excfds);
663 select_timeout.tv_sec = 0;
664 select_timeout.tv_usec = 50000;
665 select(max_fd, &readfds, &writefds,
666 &excfds, &select_timeout);
667 }
668 }
669 #else
670 while (slot->in_use) {
671 slot->curl_result = curl_easy_perform(slot->curl);
672 finish_active_slot(slot);
673 }
674 #endif
675 }
676
677 static void closedown_active_slot(struct active_request_slot *slot)
678 {
679 active_requests--;
680 slot->in_use = 0;
681 }
682
683 static void release_active_slot(struct active_request_slot *slot)
684 {
685 closedown_active_slot(slot);
686 if (slot->curl && curl_session_count > min_curl_sessions) {
687 #ifdef USE_CURL_MULTI
688 curl_multi_remove_handle(curlm, slot->curl);
689 #endif
690 curl_easy_cleanup(slot->curl);
691 slot->curl = NULL;
692 curl_session_count--;
693 }
694 #ifdef USE_CURL_MULTI
695 fill_active_slots();
696 #endif
697 }
698
699 void finish_active_slot(struct active_request_slot *slot)
700 {
701 closedown_active_slot(slot);
702 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
703
704 if (slot->finished != NULL)
705 (*slot->finished) = 1;
706
707 /* Store slot results so they can be read after the slot is reused */
708 if (slot->results != NULL) {
709 slot->results->curl_result = slot->curl_result;
710 slot->results->http_code = slot->http_code;
711 }
712
713 /* Run callback if appropriate */
714 if (slot->callback_func != NULL)
715 slot->callback_func(slot->callback_data);
716 }
717
718 void finish_all_active_slots(void)
719 {
720 struct active_request_slot *slot = active_queue_head;
721
722 while (slot != NULL)
723 if (slot->in_use) {
724 run_active_slot(slot);
725 slot = active_queue_head;
726 } else {
727 slot = slot->next;
728 }
729 }
730
731 /* Helpers for modifying and creating URLs */
732 static inline int needs_quote(int ch)
733 {
734 if (((ch >= 'A') && (ch <= 'Z'))
735 || ((ch >= 'a') && (ch <= 'z'))
736 || ((ch >= '0') && (ch <= '9'))
737 || (ch == '/')
738 || (ch == '-')
739 || (ch == '.'))
740 return 0;
741 return 1;
742 }
743
744 static inline int hex(int v)
745 {
746 if (v < 10)
747 return '0' + v;
748 else
749 return 'A' + v - 10;
750 }
751
752 static char *quote_ref_url(const char *base, const char *ref)
753 {
754 struct strbuf buf = STRBUF_INIT;
755 const char *cp;
756 int ch;
757
758 end_url_with_slash(&buf, base);
759
760 for (cp = ref; (ch = *cp) != 0; cp++)
761 if (needs_quote(ch))
762 strbuf_addf(&buf, "%%%02x", ch);
763 else
764 strbuf_addch(&buf, *cp);
765
766 return strbuf_detach(&buf, NULL);
767 }
768
769 void append_remote_object_url(struct strbuf *buf, const char *url,
770 const char *hex,
771 int only_two_digit_prefix)
772 {
773 end_url_with_slash(buf, url);
774
775 strbuf_addf(buf, "objects/%.*s/", 2, hex);
776 if (!only_two_digit_prefix)
777 strbuf_addf(buf, "%s", hex+2);
778 }
779
780 char *get_remote_object_url(const char *url, const char *hex,
781 int only_two_digit_prefix)
782 {
783 struct strbuf buf = STRBUF_INIT;
784 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
785 return strbuf_detach(&buf, NULL);
786 }
787
788 /* http_request() targets */
789 #define HTTP_REQUEST_STRBUF 0
790 #define HTTP_REQUEST_FILE 1
791
792 static int http_request(const char *url, void *result, int target, int options)
793 {
794 struct active_request_slot *slot;
795 struct slot_results results;
796 struct curl_slist *headers = NULL;
797 struct strbuf buf = STRBUF_INIT;
798 int ret;
799
800 slot = get_active_slot();
801 slot->results = &results;
802 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
803
804 if (result == NULL) {
805 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
806 } else {
807 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
808 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
809
810 if (target == HTTP_REQUEST_FILE) {
811 long posn = ftell(result);
812 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
813 fwrite);
814 if (posn > 0) {
815 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
816 headers = curl_slist_append(headers, buf.buf);
817 strbuf_reset(&buf);
818 }
819 slot->local = result;
820 } else
821 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
822 fwrite_buffer);
823 }
824
825 strbuf_addstr(&buf, "Pragma:");
826 if (options & HTTP_NO_CACHE)
827 strbuf_addstr(&buf, " no-cache");
828
829 headers = curl_slist_append(headers, buf.buf);
830
831 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
832 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
833
834 if (start_active_slot(slot)) {
835 run_active_slot(slot);
836 if (results.curl_result == CURLE_OK)
837 ret = HTTP_OK;
838 else if (missing_target(&results))
839 ret = HTTP_MISSING_TARGET;
840 else if (results.http_code == 401) {
841 if (user_name) {
842 ret = HTTP_NOAUTH;
843 } else {
844 /*
845 * git_getpass is needed here because its very likely stdin/stdout are
846 * pipes to our parent process. So we instead need to use /dev/tty,
847 * but that is non-portable. Using git_getpass() can at least be stubbed
848 * on other platforms with a different implementation if/when necessary.
849 */
850 user_name = xstrdup(git_getpass("Username: "));
851 init_curl_http_auth(slot->curl);
852 ret = HTTP_REAUTH;
853 }
854 } else {
855 if (!curl_errorstr[0])
856 strlcpy(curl_errorstr,
857 curl_easy_strerror(results.curl_result),
858 sizeof(curl_errorstr));
859 ret = HTTP_ERROR;
860 }
861 } else {
862 error("Unable to start HTTP request for %s", url);
863 ret = HTTP_START_FAILED;
864 }
865
866 slot->local = NULL;
867 curl_slist_free_all(headers);
868 strbuf_release(&buf);
869
870 return ret;
871 }
872
873 int http_get_strbuf(const char *url, struct strbuf *result, int options)
874 {
875 int http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
876 if (http_ret == HTTP_REAUTH) {
877 http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
878 }
879 return http_ret;
880 }
881
882 /*
883 * Downloads an url and stores the result in the given file.
884 *
885 * If a previous interrupted download is detected (i.e. a previous temporary
886 * file is still around) the download is resumed.
887 */
888 static int http_get_file(const char *url, const char *filename, int options)
889 {
890 int ret;
891 struct strbuf tmpfile = STRBUF_INIT;
892 FILE *result;
893
894 strbuf_addf(&tmpfile, "%s.temp", filename);
895 result = fopen(tmpfile.buf, "a");
896 if (! result) {
897 error("Unable to open local file %s", tmpfile.buf);
898 ret = HTTP_ERROR;
899 goto cleanup;
900 }
901
902 ret = http_request(url, result, HTTP_REQUEST_FILE, options);
903 fclose(result);
904
905 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
906 ret = HTTP_ERROR;
907 cleanup:
908 strbuf_release(&tmpfile);
909 return ret;
910 }
911
912 int http_error(const char *url, int ret)
913 {
914 /* http_request has already handled HTTP_START_FAILED. */
915 if (ret != HTTP_START_FAILED)
916 error("%s while accessing %s", curl_errorstr, url);
917
918 return ret;
919 }
920
921 int http_fetch_ref(const char *base, struct ref *ref)
922 {
923 char *url;
924 struct strbuf buffer = STRBUF_INIT;
925 int ret = -1;
926
927 url = quote_ref_url(base, ref->name);
928 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
929 strbuf_rtrim(&buffer);
930 if (buffer.len == 40)
931 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
932 else if (!prefixcmp(buffer.buf, "ref: ")) {
933 ref->symref = xstrdup(buffer.buf + 5);
934 ret = 0;
935 }
936 }
937
938 strbuf_release(&buffer);
939 free(url);
940 return ret;
941 }
942
943 /* Helpers for fetching packs */
944 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
945 {
946 char *url, *tmp;
947 struct strbuf buf = STRBUF_INIT;
948
949 if (http_is_verbose)
950 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
951
952 end_url_with_slash(&buf, base_url);
953 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
954 url = strbuf_detach(&buf, NULL);
955
956 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
957 tmp = strbuf_detach(&buf, NULL);
958
959 if (http_get_file(url, tmp, 0) != HTTP_OK) {
960 error("Unable to get pack index %s\n", url);
961 free(tmp);
962 tmp = NULL;
963 }
964
965 free(url);
966 return tmp;
967 }
968
969 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
970 unsigned char *sha1, const char *base_url)
971 {
972 struct packed_git *new_pack;
973 char *tmp_idx = NULL;
974 int ret;
975
976 if (has_pack_index(sha1)) {
977 new_pack = parse_pack_index(sha1, NULL);
978 if (!new_pack)
979 return -1; /* parse_pack_index() already issued error message */
980 goto add_pack;
981 }
982
983 tmp_idx = fetch_pack_index(sha1, base_url);
984 if (!tmp_idx)
985 return -1;
986
987 new_pack = parse_pack_index(sha1, tmp_idx);
988 if (!new_pack) {
989 unlink(tmp_idx);
990 free(tmp_idx);
991
992 return -1; /* parse_pack_index() already issued error message */
993 }
994
995 ret = verify_pack_index(new_pack);
996 if (!ret) {
997 close_pack_index(new_pack);
998 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
999 }
1000 free(tmp_idx);
1001 if (ret)
1002 return -1;
1003
1004 add_pack:
1005 new_pack->next = *packs_head;
1006 *packs_head = new_pack;
1007 return 0;
1008 }
1009
1010 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1011 {
1012 int ret = 0, i = 0;
1013 char *url, *data;
1014 struct strbuf buf = STRBUF_INIT;
1015 unsigned char sha1[20];
1016
1017 end_url_with_slash(&buf, base_url);
1018 strbuf_addstr(&buf, "objects/info/packs");
1019 url = strbuf_detach(&buf, NULL);
1020
1021 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1022 if (ret != HTTP_OK)
1023 goto cleanup;
1024
1025 data = buf.buf;
1026 while (i < buf.len) {
1027 switch (data[i]) {
1028 case 'P':
1029 i++;
1030 if (i + 52 <= buf.len &&
1031 !prefixcmp(data + i, " pack-") &&
1032 !prefixcmp(data + i + 46, ".pack\n")) {
1033 get_sha1_hex(data + i + 6, sha1);
1034 fetch_and_setup_pack_index(packs_head, sha1,
1035 base_url);
1036 i += 51;
1037 break;
1038 }
1039 default:
1040 while (i < buf.len && data[i] != '\n')
1041 i++;
1042 }
1043 i++;
1044 }
1045
1046 cleanup:
1047 free(url);
1048 return ret;
1049 }
1050
1051 void release_http_pack_request(struct http_pack_request *preq)
1052 {
1053 if (preq->packfile != NULL) {
1054 fclose(preq->packfile);
1055 preq->packfile = NULL;
1056 preq->slot->local = NULL;
1057 }
1058 if (preq->range_header != NULL) {
1059 curl_slist_free_all(preq->range_header);
1060 preq->range_header = NULL;
1061 }
1062 preq->slot = NULL;
1063 free(preq->url);
1064 }
1065
1066 int finish_http_pack_request(struct http_pack_request *preq)
1067 {
1068 struct packed_git **lst;
1069 struct packed_git *p = preq->target;
1070 char *tmp_idx;
1071 struct child_process ip;
1072 const char *ip_argv[8];
1073
1074 close_pack_index(p);
1075
1076 fclose(preq->packfile);
1077 preq->packfile = NULL;
1078 preq->slot->local = NULL;
1079
1080 lst = preq->lst;
1081 while (*lst != p)
1082 lst = &((*lst)->next);
1083 *lst = (*lst)->next;
1084
1085 tmp_idx = xstrdup(preq->tmpfile);
1086 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1087 ".idx.temp");
1088
1089 ip_argv[0] = "index-pack";
1090 ip_argv[1] = "-o";
1091 ip_argv[2] = tmp_idx;
1092 ip_argv[3] = preq->tmpfile;
1093 ip_argv[4] = NULL;
1094
1095 memset(&ip, 0, sizeof(ip));
1096 ip.argv = ip_argv;
1097 ip.git_cmd = 1;
1098 ip.no_stdin = 1;
1099 ip.no_stdout = 1;
1100
1101 if (run_command(&ip)) {
1102 unlink(preq->tmpfile);
1103 unlink(tmp_idx);
1104 free(tmp_idx);
1105 return -1;
1106 }
1107
1108 unlink(sha1_pack_index_name(p->sha1));
1109
1110 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1111 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1112 free(tmp_idx);
1113 return -1;
1114 }
1115
1116 install_packed_git(p);
1117 free(tmp_idx);
1118 return 0;
1119 }
1120
1121 struct http_pack_request *new_http_pack_request(
1122 struct packed_git *target, const char *base_url)
1123 {
1124 long prev_posn = 0;
1125 char range[RANGE_HEADER_SIZE];
1126 struct strbuf buf = STRBUF_INIT;
1127 struct http_pack_request *preq;
1128
1129 preq = xcalloc(1, sizeof(*preq));
1130 preq->target = target;
1131
1132 end_url_with_slash(&buf, base_url);
1133 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1134 sha1_to_hex(target->sha1));
1135 preq->url = strbuf_detach(&buf, NULL);
1136
1137 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1138 sha1_pack_name(target->sha1));
1139 preq->packfile = fopen(preq->tmpfile, "a");
1140 if (!preq->packfile) {
1141 error("Unable to open local file %s for pack",
1142 preq->tmpfile);
1143 goto abort;
1144 }
1145
1146 preq->slot = get_active_slot();
1147 preq->slot->local = preq->packfile;
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 data_received++;
1205 return size;
1206 }
1207
1208 struct http_object_request *new_http_object_request(const char *base_url,
1209 unsigned char *sha1)
1210 {
1211 char *hex = sha1_to_hex(sha1);
1212 char *filename;
1213 char prevfile[PATH_MAX];
1214 int prevlocal;
1215 char prev_buf[PREV_BUF_SIZE];
1216 ssize_t prev_read = 0;
1217 long prev_posn = 0;
1218 char range[RANGE_HEADER_SIZE];
1219 struct curl_slist *range_header = NULL;
1220 struct http_object_request *freq;
1221
1222 freq = xcalloc(1, sizeof(*freq));
1223 hashcpy(freq->sha1, sha1);
1224 freq->localfile = -1;
1225
1226 filename = sha1_file_name(sha1);
1227 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1228 "%s.temp", filename);
1229
1230 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1231 unlink_or_warn(prevfile);
1232 rename(freq->tmpfile, prevfile);
1233 unlink_or_warn(freq->tmpfile);
1234
1235 if (freq->localfile != -1)
1236 error("fd leakage in start: %d", freq->localfile);
1237 freq->localfile = open(freq->tmpfile,
1238 O_WRONLY | O_CREAT | O_EXCL, 0666);
1239 /*
1240 * This could have failed due to the "lazy directory creation";
1241 * try to mkdir the last path component.
1242 */
1243 if (freq->localfile < 0 && errno == ENOENT) {
1244 char *dir = strrchr(freq->tmpfile, '/');
1245 if (dir) {
1246 *dir = 0;
1247 mkdir(freq->tmpfile, 0777);
1248 *dir = '/';
1249 }
1250 freq->localfile = open(freq->tmpfile,
1251 O_WRONLY | O_CREAT | O_EXCL, 0666);
1252 }
1253
1254 if (freq->localfile < 0) {
1255 error("Couldn't create temporary file %s: %s",
1256 freq->tmpfile, strerror(errno));
1257 goto abort;
1258 }
1259
1260 git_inflate_init(&freq->stream);
1261
1262 git_SHA1_Init(&freq->c);
1263
1264 freq->url = get_remote_object_url(base_url, hex, 0);
1265
1266 /*
1267 * If a previous temp file is present, process what was already
1268 * fetched.
1269 */
1270 prevlocal = open(prevfile, O_RDONLY);
1271 if (prevlocal != -1) {
1272 do {
1273 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1274 if (prev_read>0) {
1275 if (fwrite_sha1_file(prev_buf,
1276 1,
1277 prev_read,
1278 freq) == prev_read) {
1279 prev_posn += prev_read;
1280 } else {
1281 prev_read = -1;
1282 }
1283 }
1284 } while (prev_read > 0);
1285 close(prevlocal);
1286 }
1287 unlink_or_warn(prevfile);
1288
1289 /*
1290 * Reset inflate/SHA1 if there was an error reading the previous temp
1291 * file; also rewind to the beginning of the local file.
1292 */
1293 if (prev_read == -1) {
1294 memset(&freq->stream, 0, sizeof(freq->stream));
1295 git_inflate_init(&freq->stream);
1296 git_SHA1_Init(&freq->c);
1297 if (prev_posn>0) {
1298 prev_posn = 0;
1299 lseek(freq->localfile, 0, SEEK_SET);
1300 if (ftruncate(freq->localfile, 0) < 0) {
1301 error("Couldn't truncate temporary file %s: %s",
1302 freq->tmpfile, strerror(errno));
1303 goto abort;
1304 }
1305 }
1306 }
1307
1308 freq->slot = get_active_slot();
1309
1310 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1311 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1312 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1313 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1314 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1315
1316 /*
1317 * If we have successfully processed data from a previous fetch
1318 * attempt, only fetch the data we don't already have.
1319 */
1320 if (prev_posn>0) {
1321 if (http_is_verbose)
1322 fprintf(stderr,
1323 "Resuming fetch of object %s at byte %ld\n",
1324 hex, prev_posn);
1325 sprintf(range, "Range: bytes=%ld-", prev_posn);
1326 range_header = curl_slist_append(range_header, range);
1327 curl_easy_setopt(freq->slot->curl,
1328 CURLOPT_HTTPHEADER, range_header);
1329 }
1330
1331 return freq;
1332
1333 abort:
1334 free(freq->url);
1335 free(freq);
1336 return NULL;
1337 }
1338
1339 void process_http_object_request(struct http_object_request *freq)
1340 {
1341 if (freq->slot == NULL)
1342 return;
1343 freq->curl_result = freq->slot->curl_result;
1344 freq->http_code = freq->slot->http_code;
1345 freq->slot = NULL;
1346 }
1347
1348 int finish_http_object_request(struct http_object_request *freq)
1349 {
1350 struct stat st;
1351
1352 close(freq->localfile);
1353 freq->localfile = -1;
1354
1355 process_http_object_request(freq);
1356
1357 if (freq->http_code == 416) {
1358 warning("requested range invalid; we may already have all the data.");
1359 } else if (freq->curl_result != CURLE_OK) {
1360 if (stat(freq->tmpfile, &st) == 0)
1361 if (st.st_size == 0)
1362 unlink_or_warn(freq->tmpfile);
1363 return -1;
1364 }
1365
1366 git_inflate_end(&freq->stream);
1367 git_SHA1_Final(freq->real_sha1, &freq->c);
1368 if (freq->zret != Z_STREAM_END) {
1369 unlink_or_warn(freq->tmpfile);
1370 return -1;
1371 }
1372 if (hashcmp(freq->sha1, freq->real_sha1)) {
1373 unlink_or_warn(freq->tmpfile);
1374 return -1;
1375 }
1376 freq->rename =
1377 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1378
1379 return freq->rename;
1380 }
1381
1382 void abort_http_object_request(struct http_object_request *freq)
1383 {
1384 unlink_or_warn(freq->tmpfile);
1385
1386 release_http_object_request(freq);
1387 }
1388
1389 void release_http_object_request(struct http_object_request *freq)
1390 {
1391 if (freq->localfile != -1) {
1392 close(freq->localfile);
1393 freq->localfile = -1;
1394 }
1395 if (freq->url != NULL) {
1396 free(freq->url);
1397 freq->url = NULL;
1398 }
1399 if (freq->slot != NULL) {
1400 freq->slot->callback_func = NULL;
1401 freq->slot->callback_data = NULL;
1402 release_active_slot(freq->slot);
1403 freq->slot = NULL;
1404 }
1405 }
git for Debian