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config.c: trivial fix for compile-time warning
[git/dscho.git] / http.c
blob0d96f37c1ea075f757ffeb3b356d999e16a43916
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
8 int data_received;
9 int active_requests;
10 int http_is_verbose;
11 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
12
13 #if LIBCURL_VERSION_NUM >= 0x070a06
14 #define LIBCURL_CAN_HANDLE_AUTH_ANY
15 #endif
16
17 static int min_curl_sessions = 1;
18 static int curl_session_count;
19 #ifdef USE_CURL_MULTI
20 static int max_requests = -1;
21 static CURLM *curlm;
22 #endif
23 #ifndef NO_CURL_EASY_DUPHANDLE
24 static CURL *curl_default;
25 #endif
26
27 #define PREV_BUF_SIZE 4096
28 #define RANGE_HEADER_SIZE 30
29
30 char curl_errorstr[CURL_ERROR_SIZE];
31
32 static int curl_ssl_verify = -1;
33 static const char *ssl_cert;
34 #if LIBCURL_VERSION_NUM >= 0x070903
35 static const char *ssl_key;
36 #endif
37 #if LIBCURL_VERSION_NUM >= 0x070908
38 static const char *ssl_capath;
39 #endif
40 static const char *ssl_cainfo;
41 static long curl_low_speed_limit = -1;
42 static long curl_low_speed_time = -1;
43 static int curl_ftp_no_epsv;
44 static const char *curl_http_proxy;
45 static const char *curl_cookie_file;
46 static struct credential http_auth;
47 static const char *user_agent;
48
49 #if LIBCURL_VERSION_NUM >= 0x071700
50 /* Use CURLOPT_KEYPASSWD as is */
51 #elif LIBCURL_VERSION_NUM >= 0x070903
52 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
53 #else
54 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
55 #endif
56
57 static struct credential cert_auth;
58 static int ssl_cert_password_required;
59
60 static struct curl_slist *pragma_header;
61 static struct curl_slist *no_pragma_header;
62
63 static struct active_request_slot *active_queue_head;
64
65 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
66 {
67 size_t size = eltsize * nmemb;
68 struct buffer *buffer = buffer_;
69
70 if (size > buffer->buf.len - buffer->posn)
71 size = buffer->buf.len - buffer->posn;
72 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
73 buffer->posn += size;
74
75 return size;
76 }
77
78 #ifndef NO_CURL_IOCTL
79 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
80 {
81 struct buffer *buffer = clientp;
82
83 switch (cmd) {
84 case CURLIOCMD_NOP:
85 return CURLIOE_OK;
86
87 case CURLIOCMD_RESTARTREAD:
88 buffer->posn = 0;
89 return CURLIOE_OK;
90
91 default:
92 return CURLIOE_UNKNOWNCMD;
93 }
94 }
95 #endif
96
97 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
98 {
99 size_t size = eltsize * nmemb;
100 struct strbuf *buffer = buffer_;
101
102 strbuf_add(buffer, ptr, size);
103 data_received++;
104 return size;
105 }
106
107 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
108 {
109 data_received++;
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.minsessions", var)) {
167 min_curl_sessions = git_config_int(var, value);
168 #ifndef USE_CURL_MULTI
169 if (min_curl_sessions > 1)
170 min_curl_sessions = 1;
171 #endif
172 return 0;
173 }
174 #ifdef USE_CURL_MULTI
175 if (!strcmp("http.maxrequests", var)) {
176 max_requests = git_config_int(var, value);
177 return 0;
178 }
179 #endif
180 if (!strcmp("http.lowspeedlimit", var)) {
181 curl_low_speed_limit = (long)git_config_int(var, value);
182 return 0;
183 }
184 if (!strcmp("http.lowspeedtime", var)) {
185 curl_low_speed_time = (long)git_config_int(var, value);
186 return 0;
187 }
188
189 if (!strcmp("http.noepsv", var)) {
190 curl_ftp_no_epsv = git_config_bool(var, value);
191 return 0;
192 }
193 if (!strcmp("http.proxy", var))
194 return git_config_string(&curl_http_proxy, var, value);
195
196 if (!strcmp("http.cookiefile", var))
197 return git_config_string(&curl_cookie_file, var, value);
198
199 if (!strcmp("http.postbuffer", var)) {
200 http_post_buffer = git_config_int(var, value);
201 if (http_post_buffer < LARGE_PACKET_MAX)
202 http_post_buffer = LARGE_PACKET_MAX;
203 return 0;
204 }
205
206 if (!strcmp("http.useragent", var))
207 return git_config_string(&user_agent, var, value);
208
209 /* Fall back on the default ones */
210 return git_default_config(var, value, cb);
211 }
212
213 static void init_curl_http_auth(CURL *result)
214 {
215 if (http_auth.username) {
216 struct strbuf up = STRBUF_INIT;
217 credential_fill(&http_auth, NULL);
218 strbuf_addf(&up, "%s:%s",
219 http_auth.username, http_auth.password);
220 curl_easy_setopt(result, CURLOPT_USERPWD,
221 strbuf_detach(&up, NULL));
222 }
223 }
224
225 static int has_cert_password(void)
226 {
227 if (ssl_cert == NULL || ssl_cert_password_required != 1)
228 return 0;
229 if (!cert_auth.description)
230 cert_auth.description = "certificate";
231 if (!cert_auth.unique) {
232 struct strbuf unique = STRBUF_INIT;
233 strbuf_addf(&unique, "cert:%s", ssl_cert);
234 cert_auth.unique = strbuf_detach(&unique, NULL);
235 }
236 if (!cert_auth.username)
237 cert_auth.username = xstrdup("");
238 credential_fill(&cert_auth, NULL);
239 return 1;
240 }
241
242 static CURL *get_curl_handle(void)
243 {
244 CURL *result = curl_easy_init();
245
246 if (!curl_ssl_verify) {
247 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
248 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
249 } else {
250 /* Verify authenticity of the peer's certificate */
251 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
252 /* The name in the cert must match whom we tried to connect */
253 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
254 }
255
256 #if LIBCURL_VERSION_NUM >= 0x070907
257 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
258 #endif
259 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
260 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
261 #endif
262
263 init_curl_http_auth(result);
264
265 if (ssl_cert != NULL)
266 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
267 if (has_cert_password())
268 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
269 #if LIBCURL_VERSION_NUM >= 0x070903
270 if (ssl_key != NULL)
271 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
272 #endif
273 #if LIBCURL_VERSION_NUM >= 0x070908
274 if (ssl_capath != NULL)
275 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
276 #endif
277 if (ssl_cainfo != NULL)
278 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
279 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
280
281 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
282 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
283 curl_low_speed_limit);
284 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
285 curl_low_speed_time);
286 }
287
288 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
289 #if LIBCURL_VERSION_NUM >= 0x071301
290 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
291 #elif LIBCURL_VERSION_NUM >= 0x071101
292 curl_easy_setopt(result, CURLOPT_POST301, 1);
293 #endif
294
295 if (getenv("GIT_CURL_VERBOSE"))
296 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
297
298 curl_easy_setopt(result, CURLOPT_USERAGENT,
299 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
300
301 if (curl_ftp_no_epsv)
302 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
303
304 if (curl_http_proxy)
305 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
306
307 return result;
308 }
309
310 static void http_auth_init(const char *url)
311 {
312 const char *at, *colon, *cp, *slash, *host, *proto_end;
313 struct strbuf unique = STRBUF_INIT;
314
315 proto_end = strstr(url, "://");
316 if (!proto_end)
317 return;
318
319 /*
320 * Ok, the URL looks like "proto://something". Which one?
321 * "proto://<user>:<pass>@<host>/...",
322 * "proto://<user>@<host>/...", or just
323 * "proto://<host>/..."?
324 */
325 cp = proto_end + 3;
326 at = strchr(cp, '@');
327 colon = strchr(cp, ':');
328 slash = strchrnul(cp, '/');
329
330 if (!at || slash <= at) {
331 /* No credentials, but we may have to ask for some later */
332 host = cp;
333 }
334 else if (!colon || at <= colon) {
335 /* Only username */
336 http_auth.username = url_decode_mem(cp, at - cp);
337 host = at + 1;
338 } else {
339 http_auth.username = url_decode_mem(cp, colon - cp);
340 http_auth.password = url_decode_mem(colon + 1, at - (colon + 1));
341 host = at + 1;
342 }
343
344 http_auth.description = url_decode_mem(host, slash - host);
345
346 strbuf_add(&unique, url, proto_end - url);
347 strbuf_addch(&unique, ':');
348 strbuf_addstr(&unique, http_auth.description);
349 http_auth.unique = strbuf_detach(&unique, NULL);
350 }
351
352 static void set_from_env(const char **var, const char *envname)
353 {
354 const char *val = getenv(envname);
355 if (val)
356 *var = val;
357 }
358
359 void http_init(struct remote *remote)
360 {
361 char *low_speed_limit;
362 char *low_speed_time;
363
364 http_is_verbose = 0;
365
366 git_config(http_options, NULL);
367
368 curl_global_init(CURL_GLOBAL_ALL);
369
370 if (remote && remote->http_proxy)
371 curl_http_proxy = xstrdup(remote->http_proxy);
372
373 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
374 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
375
376 #ifdef USE_CURL_MULTI
377 {
378 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
379 if (http_max_requests != NULL)
380 max_requests = atoi(http_max_requests);
381 }
382
383 curlm = curl_multi_init();
384 if (curlm == NULL) {
385 fprintf(stderr, "Error creating curl multi handle.\n");
386 exit(1);
387 }
388 #endif
389
390 if (getenv("GIT_SSL_NO_VERIFY"))
391 curl_ssl_verify = 0;
392
393 set_from_env(&ssl_cert, "GIT_SSL_CERT");
394 #if LIBCURL_VERSION_NUM >= 0x070903
395 set_from_env(&ssl_key, "GIT_SSL_KEY");
396 #endif
397 #if LIBCURL_VERSION_NUM >= 0x070908
398 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
399 #endif
400 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
401
402 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
403
404 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
405 if (low_speed_limit != NULL)
406 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
407 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
408 if (low_speed_time != NULL)
409 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
410
411 if (curl_ssl_verify == -1)
412 curl_ssl_verify = 1;
413
414 curl_session_count = 0;
415 #ifdef USE_CURL_MULTI
416 if (max_requests < 1)
417 max_requests = DEFAULT_MAX_REQUESTS;
418 #endif
419
420 if (getenv("GIT_CURL_FTP_NO_EPSV"))
421 curl_ftp_no_epsv = 1;
422
423 if (remote && remote->url && remote->url[0]) {
424 http_auth_init(remote->url[0]);
425 if (!ssl_cert_password_required &&
426 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
427 !prefixcmp(remote->url[0], "https://"))
428 ssl_cert_password_required = 1;
429 }
430
431 #ifndef NO_CURL_EASY_DUPHANDLE
432 curl_default = get_curl_handle();
433 #endif
434 }
435
436 void http_cleanup(void)
437 {
438 struct active_request_slot *slot = active_queue_head;
439
440 while (slot != NULL) {
441 struct active_request_slot *next = slot->next;
442 if (slot->curl != NULL) {
443 #ifdef USE_CURL_MULTI
444 curl_multi_remove_handle(curlm, slot->curl);
445 #endif
446 curl_easy_cleanup(slot->curl);
447 }
448 free(slot);
449 slot = next;
450 }
451 active_queue_head = NULL;
452
453 #ifndef NO_CURL_EASY_DUPHANDLE
454 curl_easy_cleanup(curl_default);
455 #endif
456
457 #ifdef USE_CURL_MULTI
458 curl_multi_cleanup(curlm);
459 #endif
460 curl_global_cleanup();
461
462 curl_slist_free_all(pragma_header);
463 pragma_header = NULL;
464
465 curl_slist_free_all(no_pragma_header);
466 no_pragma_header = NULL;
467
468 if (curl_http_proxy) {
469 free((void *)curl_http_proxy);
470 curl_http_proxy = NULL;
471 }
472
473 if (cert_auth.password) {
474 memset(cert_auth.password, 0, strlen(cert_auth.password));
475 free(cert_auth.password);
476 cert_auth.password = NULL;
477 }
478 ssl_cert_password_required = 0;
479 }
480
481 struct active_request_slot *get_active_slot(void)
482 {
483 struct active_request_slot *slot = active_queue_head;
484 struct active_request_slot *newslot;
485
486 #ifdef USE_CURL_MULTI
487 int num_transfers;
488
489 /* Wait for a slot to open up if the queue is full */
490 while (active_requests >= max_requests) {
491 curl_multi_perform(curlm, &num_transfers);
492 if (num_transfers < active_requests)
493 process_curl_messages();
494 }
495 #endif
496
497 while (slot != NULL && slot->in_use)
498 slot = slot->next;
499
500 if (slot == NULL) {
501 newslot = xmalloc(sizeof(*newslot));
502 newslot->curl = NULL;
503 newslot->in_use = 0;
504 newslot->next = NULL;
505
506 slot = active_queue_head;
507 if (slot == NULL) {
508 active_queue_head = newslot;
509 } else {
510 while (slot->next != NULL)
511 slot = slot->next;
512 slot->next = newslot;
513 }
514 slot = newslot;
515 }
516
517 if (slot->curl == NULL) {
518 #ifdef NO_CURL_EASY_DUPHANDLE
519 slot->curl = get_curl_handle();
520 #else
521 slot->curl = curl_easy_duphandle(curl_default);
522 #endif
523 curl_session_count++;
524 }
525
526 active_requests++;
527 slot->in_use = 1;
528 slot->local = NULL;
529 slot->results = NULL;
530 slot->finished = NULL;
531 slot->callback_data = NULL;
532 slot->callback_func = NULL;
533 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
534 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
535 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
536 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
537 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
538 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
539 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
540 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
541 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
542
543 return slot;
544 }
545
546 int start_active_slot(struct active_request_slot *slot)
547 {
548 #ifdef USE_CURL_MULTI
549 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
550 int num_transfers;
551
552 if (curlm_result != CURLM_OK &&
553 curlm_result != CURLM_CALL_MULTI_PERFORM) {
554 active_requests--;
555 slot->in_use = 0;
556 return 0;
557 }
558
559 /*
560 * We know there must be something to do, since we just added
561 * something.
562 */
563 curl_multi_perform(curlm, &num_transfers);
564 #endif
565 return 1;
566 }
567
568 #ifdef USE_CURL_MULTI
569 struct fill_chain {
570 void *data;
571 int (*fill)(void *);
572 struct fill_chain *next;
573 };
574
575 static struct fill_chain *fill_cfg;
576
577 void add_fill_function(void *data, int (*fill)(void *))
578 {
579 struct fill_chain *new = xmalloc(sizeof(*new));
580 struct fill_chain **linkp = &fill_cfg;
581 new->data = data;
582 new->fill = fill;
583 new->next = NULL;
584 while (*linkp)
585 linkp = &(*linkp)->next;
586 *linkp = new;
587 }
588
589 void fill_active_slots(void)
590 {
591 struct active_request_slot *slot = active_queue_head;
592
593 while (active_requests < max_requests) {
594 struct fill_chain *fill;
595 for (fill = fill_cfg; fill; fill = fill->next)
596 if (fill->fill(fill->data))
597 break;
598
599 if (!fill)
600 break;
601 }
602
603 while (slot != NULL) {
604 if (!slot->in_use && slot->curl != NULL
605 && curl_session_count > min_curl_sessions) {
606 curl_easy_cleanup(slot->curl);
607 slot->curl = NULL;
608 curl_session_count--;
609 }
610 slot = slot->next;
611 }
612 }
613
614 void step_active_slots(void)
615 {
616 int num_transfers;
617 CURLMcode curlm_result;
618
619 do {
620 curlm_result = curl_multi_perform(curlm, &num_transfers);
621 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
622 if (num_transfers < active_requests) {
623 process_curl_messages();
624 fill_active_slots();
625 }
626 }
627 #endif
628
629 void run_active_slot(struct active_request_slot *slot)
630 {
631 #ifdef USE_CURL_MULTI
632 long last_pos = 0;
633 long current_pos;
634 fd_set readfds;
635 fd_set writefds;
636 fd_set excfds;
637 int max_fd;
638 struct timeval select_timeout;
639 int finished = 0;
640
641 slot->finished = &finished;
642 while (!finished) {
643 data_received = 0;
644 step_active_slots();
645
646 if (!data_received && slot->local != NULL) {
647 current_pos = ftell(slot->local);
648 if (current_pos > last_pos)
649 data_received++;
650 last_pos = current_pos;
651 }
652
653 if (slot->in_use && !data_received) {
654 max_fd = 0;
655 FD_ZERO(&readfds);
656 FD_ZERO(&writefds);
657 FD_ZERO(&excfds);
658 select_timeout.tv_sec = 0;
659 select_timeout.tv_usec = 50000;
660 select(max_fd, &readfds, &writefds,
661 &excfds, &select_timeout);
662 }
663 }
664 #else
665 while (slot->in_use) {
666 slot->curl_result = curl_easy_perform(slot->curl);
667 finish_active_slot(slot);
668 }
669 #endif
670 }
671
672 static void closedown_active_slot(struct active_request_slot *slot)
673 {
674 active_requests--;
675 slot->in_use = 0;
676 }
677
678 static void release_active_slot(struct active_request_slot *slot)
679 {
680 closedown_active_slot(slot);
681 if (slot->curl && curl_session_count > min_curl_sessions) {
682 #ifdef USE_CURL_MULTI
683 curl_multi_remove_handle(curlm, slot->curl);
684 #endif
685 curl_easy_cleanup(slot->curl);
686 slot->curl = NULL;
687 curl_session_count--;
688 }
689 #ifdef USE_CURL_MULTI
690 fill_active_slots();
691 #endif
692 }
693
694 void finish_active_slot(struct active_request_slot *slot)
695 {
696 closedown_active_slot(slot);
697 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
698
699 if (slot->finished != NULL)
700 (*slot->finished) = 1;
701
702 /* Store slot results so they can be read after the slot is reused */
703 if (slot->results != NULL) {
704 slot->results->curl_result = slot->curl_result;
705 slot->results->http_code = slot->http_code;
706 }
707
708 /* Run callback if appropriate */
709 if (slot->callback_func != NULL)
710 slot->callback_func(slot->callback_data);
711 }
712
713 void finish_all_active_slots(void)
714 {
715 struct active_request_slot *slot = active_queue_head;
716
717 while (slot != NULL)
718 if (slot->in_use) {
719 run_active_slot(slot);
720 slot = active_queue_head;
721 } else {
722 slot = slot->next;
723 }
724 }
725
726 /* Helpers for modifying and creating URLs */
727 static inline int needs_quote(int ch)
728 {
729 if (((ch >= 'A') && (ch <= 'Z'))
730 || ((ch >= 'a') && (ch <= 'z'))
731 || ((ch >= '0') && (ch <= '9'))
732 || (ch == '/')
733 || (ch == '-')
734 || (ch == '.'))
735 return 0;
736 return 1;
737 }
738
739 static inline int hex(int v)
740 {
741 if (v < 10)
742 return '0' + v;
743 else
744 return 'A' + v - 10;
745 }
746
747 static char *quote_ref_url(const char *base, const char *ref)
748 {
749 struct strbuf buf = STRBUF_INIT;
750 const char *cp;
751 int ch;
752
753 end_url_with_slash(&buf, base);
754
755 for (cp = ref; (ch = *cp) != 0; cp++)
756 if (needs_quote(ch))
757 strbuf_addf(&buf, "%%%02x", ch);
758 else
759 strbuf_addch(&buf, *cp);
760
761 return strbuf_detach(&buf, NULL);
762 }
763
764 void append_remote_object_url(struct strbuf *buf, const char *url,
765 const char *hex,
766 int only_two_digit_prefix)
767 {
768 end_url_with_slash(buf, url);
769
770 strbuf_addf(buf, "objects/%.*s/", 2, hex);
771 if (!only_two_digit_prefix)
772 strbuf_addf(buf, "%s", hex+2);
773 }
774
775 char *get_remote_object_url(const char *url, const char *hex,
776 int only_two_digit_prefix)
777 {
778 struct strbuf buf = STRBUF_INIT;
779 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
780 return strbuf_detach(&buf, NULL);
781 }
782
783 /* http_request() targets */
784 #define HTTP_REQUEST_STRBUF 0
785 #define HTTP_REQUEST_FILE 1
786
787 static int http_request(const char *url, void *result, int target, int options)
788 {
789 struct active_request_slot *slot;
790 struct slot_results results;
791 struct curl_slist *headers = NULL;
792 struct strbuf buf = STRBUF_INIT;
793 int ret;
794
795 slot = get_active_slot();
796 slot->results = &results;
797 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
798
799 if (result == NULL) {
800 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
801 } else {
802 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
803 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
804
805 if (target == HTTP_REQUEST_FILE) {
806 long posn = ftell(result);
807 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
808 fwrite);
809 if (posn > 0) {
810 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
811 headers = curl_slist_append(headers, buf.buf);
812 strbuf_reset(&buf);
813 }
814 slot->local = result;
815 } else
816 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
817 fwrite_buffer);
818 }
819
820 strbuf_addstr(&buf, "Pragma:");
821 if (options & HTTP_NO_CACHE)
822 strbuf_addstr(&buf, " no-cache");
823
824 headers = curl_slist_append(headers, buf.buf);
825
826 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
827 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
828
829 if (start_active_slot(slot)) {
830 run_active_slot(slot);
831 if (results.curl_result == CURLE_OK)
832 ret = HTTP_OK;
833 else if (missing_target(&results))
834 ret = HTTP_MISSING_TARGET;
835 else if (results.http_code == 401) {
836 if (http_auth.username) {
837 credential_reject(&http_auth, NULL);
838 ret = HTTP_NOAUTH;
839 } else {
840 credential_fill(&http_auth, NULL);
841 init_curl_http_auth(slot->curl);
842 ret = HTTP_REAUTH;
843 }
844 } else
845 ret = HTTP_ERROR;
846 } else {
847 error("Unable to start HTTP request for %s", url);
848 ret = HTTP_START_FAILED;
849 }
850
851 slot->local = NULL;
852 curl_slist_free_all(headers);
853 strbuf_release(&buf);
854
855 return ret;
856 }
857
858 static int http_request_reauth(const char *url, void *result, int target,
859 int options)
860 {
861 int ret = http_request(url, result, target, options);
862 if (ret != HTTP_REAUTH)
863 return ret;
864 return http_request(url, result, target, options);
865 }
866
867 int http_get_strbuf(const char *url, struct strbuf *result, int options)
868 {
869 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
870 }
871
872 /*
873 * Downloads an url and stores the result in the given file.
874 *
875 * If a previous interrupted download is detected (i.e. a previous temporary
876 * file is still around) the download is resumed.
877 */
878 static int http_get_file(const char *url, const char *filename, int options)
879 {
880 int ret;
881 struct strbuf tmpfile = STRBUF_INIT;
882 FILE *result;
883
884 strbuf_addf(&tmpfile, "%s.temp", filename);
885 result = fopen(tmpfile.buf, "a");
886 if (! result) {
887 error("Unable to open local file %s", tmpfile.buf);
888 ret = HTTP_ERROR;
889 goto cleanup;
890 }
891
892 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
893 fclose(result);
894
895 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
896 ret = HTTP_ERROR;
897 cleanup:
898 strbuf_release(&tmpfile);
899 return ret;
900 }
901
902 int http_error(const char *url, int ret)
903 {
904 /* http_request has already handled HTTP_START_FAILED. */
905 if (ret != HTTP_START_FAILED)
906 error("%s while accessing %s\n", curl_errorstr, url);
907
908 return ret;
909 }
910
911 int http_fetch_ref(const char *base, struct ref *ref)
912 {
913 char *url;
914 struct strbuf buffer = STRBUF_INIT;
915 int ret = -1;
916
917 url = quote_ref_url(base, ref->name);
918 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
919 strbuf_rtrim(&buffer);
920 if (buffer.len == 40)
921 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
922 else if (!prefixcmp(buffer.buf, "ref: ")) {
923 ref->symref = xstrdup(buffer.buf + 5);
924 ret = 0;
925 }
926 }
927
928 strbuf_release(&buffer);
929 free(url);
930 return ret;
931 }
932
933 /* Helpers for fetching packs */
934 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
935 {
936 char *url, *tmp;
937 struct strbuf buf = STRBUF_INIT;
938
939 if (http_is_verbose)
940 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
941
942 end_url_with_slash(&buf, base_url);
943 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
944 url = strbuf_detach(&buf, NULL);
945
946 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
947 tmp = strbuf_detach(&buf, NULL);
948
949 if (http_get_file(url, tmp, 0) != HTTP_OK) {
950 error("Unable to get pack index %s\n", url);
951 free(tmp);
952 tmp = NULL;
953 }
954
955 free(url);
956 return tmp;
957 }
958
959 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
960 unsigned char *sha1, const char *base_url)
961 {
962 struct packed_git *new_pack;
963 char *tmp_idx = NULL;
964 int ret;
965
966 if (has_pack_index(sha1)) {
967 new_pack = parse_pack_index(sha1, NULL);
968 if (!new_pack)
969 return -1; /* parse_pack_index() already issued error message */
970 goto add_pack;
971 }
972
973 tmp_idx = fetch_pack_index(sha1, base_url);
974 if (!tmp_idx)
975 return -1;
976
977 new_pack = parse_pack_index(sha1, tmp_idx);
978 if (!new_pack) {
979 unlink(tmp_idx);
980 free(tmp_idx);
981
982 return -1; /* parse_pack_index() already issued error message */
983 }
984
985 ret = verify_pack_index(new_pack);
986 if (!ret) {
987 close_pack_index(new_pack);
988 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
989 }
990 free(tmp_idx);
991 if (ret)
992 return -1;
993
994 add_pack:
995 new_pack->next = *packs_head;
996 *packs_head = new_pack;
997 return 0;
998 }
999
1000 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1001 {
1002 int ret = 0, i = 0;
1003 char *url, *data;
1004 struct strbuf buf = STRBUF_INIT;
1005 unsigned char sha1[20];
1006
1007 end_url_with_slash(&buf, base_url);
1008 strbuf_addstr(&buf, "objects/info/packs");
1009 url = strbuf_detach(&buf, NULL);
1010
1011 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1012 if (ret != HTTP_OK)
1013 goto cleanup;
1014
1015 data = buf.buf;
1016 while (i < buf.len) {
1017 switch (data[i]) {
1018 case 'P':
1019 i++;
1020 if (i + 52 <= buf.len &&
1021 !prefixcmp(data + i, " pack-") &&
1022 !prefixcmp(data + i + 46, ".pack\n")) {
1023 get_sha1_hex(data + i + 6, sha1);
1024 fetch_and_setup_pack_index(packs_head, sha1,
1025 base_url);
1026 i += 51;
1027 break;
1028 }
1029 default:
1030 while (i < buf.len && data[i] != '\n')
1031 i++;
1032 }
1033 i++;
1034 }
1035
1036 cleanup:
1037 free(url);
1038 return ret;
1039 }
1040
1041 void release_http_pack_request(struct http_pack_request *preq)
1042 {
1043 if (preq->packfile != NULL) {
1044 fclose(preq->packfile);
1045 preq->packfile = NULL;
1046 preq->slot->local = NULL;
1047 }
1048 if (preq->range_header != NULL) {
1049 curl_slist_free_all(preq->range_header);
1050 preq->range_header = NULL;
1051 }
1052 preq->slot = NULL;
1053 free(preq->url);
1054 }
1055
1056 int finish_http_pack_request(struct http_pack_request *preq)
1057 {
1058 struct packed_git **lst;
1059 struct packed_git *p = preq->target;
1060 char *tmp_idx;
1061 struct child_process ip;
1062 const char *ip_argv[8];
1063
1064 close_pack_index(p);
1065
1066 fclose(preq->packfile);
1067 preq->packfile = NULL;
1068 preq->slot->local = NULL;
1069
1070 lst = preq->lst;
1071 while (*lst != p)
1072 lst = &((*lst)->next);
1073 *lst = (*lst)->next;
1074
1075 tmp_idx = xstrdup(preq->tmpfile);
1076 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1077 ".idx.temp");
1078
1079 ip_argv[0] = "index-pack";
1080 ip_argv[1] = "-o";
1081 ip_argv[2] = tmp_idx;
1082 ip_argv[3] = preq->tmpfile;
1083 ip_argv[4] = NULL;
1084
1085 memset(&ip, 0, sizeof(ip));
1086 ip.argv = ip_argv;
1087 ip.git_cmd = 1;
1088 ip.no_stdin = 1;
1089 ip.no_stdout = 1;
1090
1091 if (run_command(&ip)) {
1092 unlink(preq->tmpfile);
1093 unlink(tmp_idx);
1094 free(tmp_idx);
1095 return -1;
1096 }
1097
1098 unlink(sha1_pack_index_name(p->sha1));
1099
1100 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1101 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1102 free(tmp_idx);
1103 return -1;
1104 }
1105
1106 install_packed_git(p);
1107 free(tmp_idx);
1108 return 0;
1109 }
1110
1111 struct http_pack_request *new_http_pack_request(
1112 struct packed_git *target, const char *base_url)
1113 {
1114 long prev_posn = 0;
1115 char range[RANGE_HEADER_SIZE];
1116 struct strbuf buf = STRBUF_INIT;
1117 struct http_pack_request *preq;
1118
1119 preq = xcalloc(1, sizeof(*preq));
1120 preq->target = target;
1121
1122 end_url_with_slash(&buf, base_url);
1123 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1124 sha1_to_hex(target->sha1));
1125 preq->url = strbuf_detach(&buf, NULL);
1126
1127 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1128 sha1_pack_name(target->sha1));
1129 preq->packfile = fopen(preq->tmpfile, "a");
1130 if (!preq->packfile) {
1131 error("Unable to open local file %s for pack",
1132 preq->tmpfile);
1133 goto abort;
1134 }
1135
1136 preq->slot = get_active_slot();
1137 preq->slot->local = preq->packfile;
1138 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1139 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1140 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1141 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1142 no_pragma_header);
1143
1144 /*
1145 * If there is data present from a previous transfer attempt,
1146 * resume where it left off
1147 */
1148 prev_posn = ftell(preq->packfile);
1149 if (prev_posn>0) {
1150 if (http_is_verbose)
1151 fprintf(stderr,
1152 "Resuming fetch of pack %s at byte %ld\n",
1153 sha1_to_hex(target->sha1), prev_posn);
1154 sprintf(range, "Range: bytes=%ld-", prev_posn);
1155 preq->range_header = curl_slist_append(NULL, range);
1156 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1157 preq->range_header);
1158 }
1159
1160 return preq;
1161
1162 abort:
1163 free(preq->url);
1164 free(preq);
1165 return NULL;
1166 }
1167
1168 /* Helpers for fetching objects (loose) */
1169 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1170 void *data)
1171 {
1172 unsigned char expn[4096];
1173 size_t size = eltsize * nmemb;
1174 int posn = 0;
1175 struct http_object_request *freq =
1176 (struct http_object_request *)data;
1177 do {
1178 ssize_t retval = xwrite(freq->localfile,
1179 (char *) ptr + posn, size - posn);
1180 if (retval < 0)
1181 return posn;
1182 posn += retval;
1183 } while (posn < size);
1184
1185 freq->stream.avail_in = size;
1186 freq->stream.next_in = (void *)ptr;
1187 do {
1188 freq->stream.next_out = expn;
1189 freq->stream.avail_out = sizeof(expn);
1190 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1191 git_SHA1_Update(&freq->c, expn,
1192 sizeof(expn) - freq->stream.avail_out);
1193 } while (freq->stream.avail_in && freq->zret == Z_OK);
1194 data_received++;
1195 return size;
1196 }
1197
1198 struct http_object_request *new_http_object_request(const char *base_url,
1199 unsigned char *sha1)
1200 {
1201 char *hex = sha1_to_hex(sha1);
1202 char *filename;
1203 char prevfile[PATH_MAX];
1204 int prevlocal;
1205 char prev_buf[PREV_BUF_SIZE];
1206 ssize_t prev_read = 0;
1207 long prev_posn = 0;
1208 char range[RANGE_HEADER_SIZE];
1209 struct curl_slist *range_header = NULL;
1210 struct http_object_request *freq;
1211
1212 freq = xcalloc(1, sizeof(*freq));
1213 hashcpy(freq->sha1, sha1);
1214 freq->localfile = -1;
1215
1216 filename = sha1_file_name(sha1);
1217 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1218 "%s.temp", filename);
1219
1220 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1221 unlink_or_warn(prevfile);
1222 rename(freq->tmpfile, prevfile);
1223 unlink_or_warn(freq->tmpfile);
1224
1225 if (freq->localfile != -1)
1226 error("fd leakage in start: %d", freq->localfile);
1227 freq->localfile = open(freq->tmpfile,
1228 O_WRONLY | O_CREAT | O_EXCL, 0666);
1229 /*
1230 * This could have failed due to the "lazy directory creation";
1231 * try to mkdir the last path component.
1232 */
1233 if (freq->localfile < 0 && errno == ENOENT) {
1234 char *dir = strrchr(freq->tmpfile, '/');
1235 if (dir) {
1236 *dir = 0;
1237 mkdir(freq->tmpfile, 0777);
1238 *dir = '/';
1239 }
1240 freq->localfile = open(freq->tmpfile,
1241 O_WRONLY | O_CREAT | O_EXCL, 0666);
1242 }
1243
1244 if (freq->localfile < 0) {
1245 error("Couldn't create temporary file %s: %s",
1246 freq->tmpfile, strerror(errno));
1247 goto abort;
1248 }
1249
1250 git_inflate_init(&freq->stream);
1251
1252 git_SHA1_Init(&freq->c);
1253
1254 freq->url = get_remote_object_url(base_url, hex, 0);
1255
1256 /*
1257 * If a previous temp file is present, process what was already
1258 * fetched.
1259 */
1260 prevlocal = open(prevfile, O_RDONLY);
1261 if (prevlocal != -1) {
1262 do {
1263 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1264 if (prev_read>0) {
1265 if (fwrite_sha1_file(prev_buf,
1266 1,
1267 prev_read,
1268 freq) == prev_read) {
1269 prev_posn += prev_read;
1270 } else {
1271 prev_read = -1;
1272 }
1273 }
1274 } while (prev_read > 0);
1275 close(prevlocal);
1276 }
1277 unlink_or_warn(prevfile);
1278
1279 /*
1280 * Reset inflate/SHA1 if there was an error reading the previous temp
1281 * file; also rewind to the beginning of the local file.
1282 */
1283 if (prev_read == -1) {
1284 memset(&freq->stream, 0, sizeof(freq->stream));
1285 git_inflate_init(&freq->stream);
1286 git_SHA1_Init(&freq->c);
1287 if (prev_posn>0) {
1288 prev_posn = 0;
1289 lseek(freq->localfile, 0, SEEK_SET);
1290 if (ftruncate(freq->localfile, 0) < 0) {
1291 error("Couldn't truncate temporary file %s: %s",
1292 freq->tmpfile, strerror(errno));
1293 goto abort;
1294 }
1295 }
1296 }
1297
1298 freq->slot = get_active_slot();
1299
1300 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1301 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1302 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1303 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1304 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1305
1306 /*
1307 * If we have successfully processed data from a previous fetch
1308 * attempt, only fetch the data we don't already have.
1309 */
1310 if (prev_posn>0) {
1311 if (http_is_verbose)
1312 fprintf(stderr,
1313 "Resuming fetch of object %s at byte %ld\n",
1314 hex, prev_posn);
1315 sprintf(range, "Range: bytes=%ld-", prev_posn);
1316 range_header = curl_slist_append(range_header, range);
1317 curl_easy_setopt(freq->slot->curl,
1318 CURLOPT_HTTPHEADER, range_header);
1319 }
1320
1321 return freq;
1322
1323 abort:
1324 free(freq->url);
1325 free(freq);
1326 return NULL;
1327 }
1328
1329 void process_http_object_request(struct http_object_request *freq)
1330 {
1331 if (freq->slot == NULL)
1332 return;
1333 freq->curl_result = freq->slot->curl_result;
1334 freq->http_code = freq->slot->http_code;
1335 freq->slot = NULL;
1336 }
1337
1338 int finish_http_object_request(struct http_object_request *freq)
1339 {
1340 struct stat st;
1341
1342 close(freq->localfile);
1343 freq->localfile = -1;
1344
1345 process_http_object_request(freq);
1346
1347 if (freq->http_code == 416) {
1348 warning("requested range invalid; we may already have all the data.");
1349 } else if (freq->curl_result != CURLE_OK) {
1350 if (stat(freq->tmpfile, &st) == 0)
1351 if (st.st_size == 0)
1352 unlink_or_warn(freq->tmpfile);
1353 return -1;
1354 }
1355
1356 git_inflate_end(&freq->stream);
1357 git_SHA1_Final(freq->real_sha1, &freq->c);
1358 if (freq->zret != Z_STREAM_END) {
1359 unlink_or_warn(freq->tmpfile);
1360 return -1;
1361 }
1362 if (hashcmp(freq->sha1, freq->real_sha1)) {
1363 unlink_or_warn(freq->tmpfile);
1364 return -1;
1365 }
1366 freq->rename =
1367 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1368
1369 return freq->rename;
1370 }
1371
1372 void abort_http_object_request(struct http_object_request *freq)
1373 {
1374 unlink_or_warn(freq->tmpfile);
1375
1376 release_http_object_request(freq);
1377 }
1378
1379 void release_http_object_request(struct http_object_request *freq)
1380 {
1381 if (freq->localfile != -1) {
1382 close(freq->localfile);
1383 freq->localfile = -1;
1384 }
1385 if (freq->url != NULL) {
1386 free(freq->url);
1387 freq->url = NULL;
1388 }
1389 if (freq->slot != NULL) {
1390 freq->slot->callback_func = NULL;
1391 freq->slot->callback_data = NULL;
1392 release_active_slot(freq->slot);
1393 freq->slot = NULL;
1394 }
1395 }
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