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status: make "how to stage" messages optional
[alt-git.git] / http.c
blob5926c5b3f7bbc781d77e2348db2990bcb51460e6
1 #include "http.h"
2 #include "pack.h"
3
4 int data_received;
5 int active_requests;
6 int http_is_verbose;
7
8 #ifdef USE_CURL_MULTI
9 static int max_requests = -1;
10 static CURLM *curlm;
11 #endif
12 #ifndef NO_CURL_EASY_DUPHANDLE
13 static CURL *curl_default;
14 #endif
15
16 #define PREV_BUF_SIZE 4096
17 #define RANGE_HEADER_SIZE 30
18
19 char curl_errorstr[CURL_ERROR_SIZE];
20
21 static int curl_ssl_verify = -1;
22 static const char *ssl_cert;
23 #if LIBCURL_VERSION_NUM >= 0x070903
24 static const char *ssl_key;
25 #endif
26 #if LIBCURL_VERSION_NUM >= 0x070908
27 static const char *ssl_capath;
28 #endif
29 static const char *ssl_cainfo;
30 static long curl_low_speed_limit = -1;
31 static long curl_low_speed_time = -1;
32 static int curl_ftp_no_epsv;
33 static const char *curl_http_proxy;
34 static char *user_name, *user_pass;
35
36 #if LIBCURL_VERSION_NUM >= 0x071700
37 /* Use CURLOPT_KEYPASSWD as is */
38 #elif LIBCURL_VERSION_NUM >= 0x070903
39 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
40 #else
41 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
42 #endif
43
44 static char *ssl_cert_password;
45 static int ssl_cert_password_required;
46
47 static struct curl_slist *pragma_header;
48 static struct curl_slist *no_pragma_header;
49
50 static struct active_request_slot *active_queue_head;
51
52 size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
53 {
54 size_t size = eltsize * nmemb;
55 struct buffer *buffer = buffer_;
56
57 if (size > buffer->buf.len - buffer->posn)
58 size = buffer->buf.len - buffer->posn;
59 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
60 buffer->posn += size;
61
62 return size;
63 }
64
65 #ifndef NO_CURL_IOCTL
66 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
67 {
68 struct buffer *buffer = clientp;
69
70 switch (cmd) {
71 case CURLIOCMD_NOP:
72 return CURLIOE_OK;
73
74 case CURLIOCMD_RESTARTREAD:
75 buffer->posn = 0;
76 return CURLIOE_OK;
77
78 default:
79 return CURLIOE_UNKNOWNCMD;
80 }
81 }
82 #endif
83
84 size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
85 {
86 size_t size = eltsize * nmemb;
87 struct strbuf *buffer = buffer_;
88
89 strbuf_add(buffer, ptr, size);
90 data_received++;
91 return size;
92 }
93
94 size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
95 {
96 data_received++;
97 return eltsize * nmemb;
98 }
99
100 static void finish_active_slot(struct active_request_slot *slot);
101
102 #ifdef USE_CURL_MULTI
103 static void process_curl_messages(void)
104 {
105 int num_messages;
106 struct active_request_slot *slot;
107 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
108
109 while (curl_message != NULL) {
110 if (curl_message->msg == CURLMSG_DONE) {
111 int curl_result = curl_message->data.result;
112 slot = active_queue_head;
113 while (slot != NULL &&
114 slot->curl != curl_message->easy_handle)
115 slot = slot->next;
116 if (slot != NULL) {
117 curl_multi_remove_handle(curlm, slot->curl);
118 slot->curl_result = curl_result;
119 finish_active_slot(slot);
120 } else {
121 fprintf(stderr, "Received DONE message for unknown request!\n");
122 }
123 } else {
124 fprintf(stderr, "Unknown CURL message received: %d\n",
125 (int)curl_message->msg);
126 }
127 curl_message = curl_multi_info_read(curlm, &num_messages);
128 }
129 }
130 #endif
131
132 static int http_options(const char *var, const char *value, void *cb)
133 {
134 if (!strcmp("http.sslverify", var)) {
135 curl_ssl_verify = git_config_bool(var, value);
136 return 0;
137 }
138 if (!strcmp("http.sslcert", var))
139 return git_config_string(&ssl_cert, var, value);
140 #if LIBCURL_VERSION_NUM >= 0x070903
141 if (!strcmp("http.sslkey", var))
142 return git_config_string(&ssl_key, var, value);
143 #endif
144 #if LIBCURL_VERSION_NUM >= 0x070908
145 if (!strcmp("http.sslcapath", var))
146 return git_config_string(&ssl_capath, var, value);
147 #endif
148 if (!strcmp("http.sslcainfo", var))
149 return git_config_string(&ssl_cainfo, var, value);
150 if (!strcmp("http.sslcertpasswordprotected", var)) {
151 if (git_config_bool(var, value))
152 ssl_cert_password_required = 1;
153 return 0;
154 }
155 #ifdef USE_CURL_MULTI
156 if (!strcmp("http.maxrequests", var)) {
157 max_requests = git_config_int(var, value);
158 return 0;
159 }
160 #endif
161 if (!strcmp("http.lowspeedlimit", var)) {
162 curl_low_speed_limit = (long)git_config_int(var, value);
163 return 0;
164 }
165 if (!strcmp("http.lowspeedtime", var)) {
166 curl_low_speed_time = (long)git_config_int(var, value);
167 return 0;
168 }
169
170 if (!strcmp("http.noepsv", var)) {
171 curl_ftp_no_epsv = git_config_bool(var, value);
172 return 0;
173 }
174 if (!strcmp("http.proxy", var))
175 return git_config_string(&curl_http_proxy, var, value);
176
177 /* Fall back on the default ones */
178 return git_default_config(var, value, cb);
179 }
180
181 static void init_curl_http_auth(CURL *result)
182 {
183 if (user_name) {
184 struct strbuf up = STRBUF_INIT;
185 if (!user_pass)
186 user_pass = xstrdup(getpass("Password: "));
187 strbuf_addf(&up, "%s:%s", user_name, user_pass);
188 curl_easy_setopt(result, CURLOPT_USERPWD,
189 strbuf_detach(&up, NULL));
190 }
191 }
192
193 static int has_cert_password(void)
194 {
195 if (ssl_cert_password != NULL)
196 return 1;
197 if (ssl_cert == NULL || ssl_cert_password_required != 1)
198 return 0;
199 /* Only prompt the user once. */
200 ssl_cert_password_required = -1;
201 ssl_cert_password = getpass("Certificate Password: ");
202 if (ssl_cert_password != NULL) {
203 ssl_cert_password = xstrdup(ssl_cert_password);
204 return 1;
205 } else
206 return 0;
207 }
208
209 static CURL *get_curl_handle(void)
210 {
211 CURL *result = curl_easy_init();
212
213 if (!curl_ssl_verify) {
214 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
215 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
216 } else {
217 /* Verify authenticity of the peer's certificate */
218 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
219 /* The name in the cert must match whom we tried to connect */
220 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
221 }
222
223 #if LIBCURL_VERSION_NUM >= 0x070907
224 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
225 #endif
226
227 init_curl_http_auth(result);
228
229 if (ssl_cert != NULL)
230 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
231 if (has_cert_password())
232 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
233 #if LIBCURL_VERSION_NUM >= 0x070903
234 if (ssl_key != NULL)
235 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
236 #endif
237 #if LIBCURL_VERSION_NUM >= 0x070908
238 if (ssl_capath != NULL)
239 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
240 #endif
241 if (ssl_cainfo != NULL)
242 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
243 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
244
245 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
246 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
247 curl_low_speed_limit);
248 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
249 curl_low_speed_time);
250 }
251
252 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
253
254 if (getenv("GIT_CURL_VERBOSE"))
255 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
256
257 curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
258
259 if (curl_ftp_no_epsv)
260 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
261
262 if (curl_http_proxy)
263 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
264
265 return result;
266 }
267
268 static void http_auth_init(const char *url)
269 {
270 char *at, *colon, *cp, *slash;
271 int len;
272
273 cp = strstr(url, "://");
274 if (!cp)
275 return;
276
277 /*
278 * Ok, the URL looks like "proto://something". Which one?
279 * "proto://<user>:<pass>@<host>/...",
280 * "proto://<user>@<host>/...", or just
281 * "proto://<host>/..."?
282 */
283 cp += 3;
284 at = strchr(cp, '@');
285 colon = strchr(cp, ':');
286 slash = strchrnul(cp, '/');
287 if (!at || slash <= at)
288 return; /* No credentials */
289 if (!colon || at <= colon) {
290 /* Only username */
291 len = at - cp;
292 user_name = xmalloc(len + 1);
293 memcpy(user_name, cp, len);
294 user_name[len] = '\0';
295 user_pass = NULL;
296 } else {
297 len = colon - cp;
298 user_name = xmalloc(len + 1);
299 memcpy(user_name, cp, len);
300 user_name[len] = '\0';
301 len = at - (colon + 1);
302 user_pass = xmalloc(len + 1);
303 memcpy(user_pass, colon + 1, len);
304 user_pass[len] = '\0';
305 }
306 }
307
308 static void set_from_env(const char **var, const char *envname)
309 {
310 const char *val = getenv(envname);
311 if (val)
312 *var = val;
313 }
314
315 void http_init(struct remote *remote)
316 {
317 char *low_speed_limit;
318 char *low_speed_time;
319
320 http_is_verbose = 0;
321
322 git_config(http_options, NULL);
323
324 curl_global_init(CURL_GLOBAL_ALL);
325
326 if (remote && remote->http_proxy)
327 curl_http_proxy = xstrdup(remote->http_proxy);
328
329 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
330 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
331
332 #ifdef USE_CURL_MULTI
333 {
334 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
335 if (http_max_requests != NULL)
336 max_requests = atoi(http_max_requests);
337 }
338
339 curlm = curl_multi_init();
340 if (curlm == NULL) {
341 fprintf(stderr, "Error creating curl multi handle.\n");
342 exit(1);
343 }
344 #endif
345
346 if (getenv("GIT_SSL_NO_VERIFY"))
347 curl_ssl_verify = 0;
348
349 set_from_env(&ssl_cert, "GIT_SSL_CERT");
350 #if LIBCURL_VERSION_NUM >= 0x070903
351 set_from_env(&ssl_key, "GIT_SSL_KEY");
352 #endif
353 #if LIBCURL_VERSION_NUM >= 0x070908
354 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
355 #endif
356 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
357
358 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
359 if (low_speed_limit != NULL)
360 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
361 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
362 if (low_speed_time != NULL)
363 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
364
365 if (curl_ssl_verify == -1)
366 curl_ssl_verify = 1;
367
368 #ifdef USE_CURL_MULTI
369 if (max_requests < 1)
370 max_requests = DEFAULT_MAX_REQUESTS;
371 #endif
372
373 if (getenv("GIT_CURL_FTP_NO_EPSV"))
374 curl_ftp_no_epsv = 1;
375
376 if (remote && remote->url && remote->url[0]) {
377 http_auth_init(remote->url[0]);
378 if (!ssl_cert_password_required &&
379 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
380 !prefixcmp(remote->url[0], "https://"))
381 ssl_cert_password_required = 1;
382 }
383
384 #ifndef NO_CURL_EASY_DUPHANDLE
385 curl_default = get_curl_handle();
386 #endif
387 }
388
389 void http_cleanup(void)
390 {
391 struct active_request_slot *slot = active_queue_head;
392
393 while (slot != NULL) {
394 struct active_request_slot *next = slot->next;
395 if (slot->curl != NULL) {
396 #ifdef USE_CURL_MULTI
397 curl_multi_remove_handle(curlm, slot->curl);
398 #endif
399 curl_easy_cleanup(slot->curl);
400 }
401 free(slot);
402 slot = next;
403 }
404 active_queue_head = NULL;
405
406 #ifndef NO_CURL_EASY_DUPHANDLE
407 curl_easy_cleanup(curl_default);
408 #endif
409
410 #ifdef USE_CURL_MULTI
411 curl_multi_cleanup(curlm);
412 #endif
413 curl_global_cleanup();
414
415 curl_slist_free_all(pragma_header);
416 pragma_header = NULL;
417
418 curl_slist_free_all(no_pragma_header);
419 no_pragma_header = NULL;
420
421 if (curl_http_proxy) {
422 free((void *)curl_http_proxy);
423 curl_http_proxy = NULL;
424 }
425
426 if (ssl_cert_password != NULL) {
427 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
428 free(ssl_cert_password);
429 ssl_cert_password = NULL;
430 }
431 ssl_cert_password_required = 0;
432 }
433
434 struct active_request_slot *get_active_slot(void)
435 {
436 struct active_request_slot *slot = active_queue_head;
437 struct active_request_slot *newslot;
438
439 #ifdef USE_CURL_MULTI
440 int num_transfers;
441
442 /* Wait for a slot to open up if the queue is full */
443 while (active_requests >= max_requests) {
444 curl_multi_perform(curlm, &num_transfers);
445 if (num_transfers < active_requests)
446 process_curl_messages();
447 }
448 #endif
449
450 while (slot != NULL && slot->in_use)
451 slot = slot->next;
452
453 if (slot == NULL) {
454 newslot = xmalloc(sizeof(*newslot));
455 newslot->curl = NULL;
456 newslot->in_use = 0;
457 newslot->next = NULL;
458
459 slot = active_queue_head;
460 if (slot == NULL) {
461 active_queue_head = newslot;
462 } else {
463 while (slot->next != NULL)
464 slot = slot->next;
465 slot->next = newslot;
466 }
467 slot = newslot;
468 }
469
470 if (slot->curl == NULL) {
471 #ifdef NO_CURL_EASY_DUPHANDLE
472 slot->curl = get_curl_handle();
473 #else
474 slot->curl = curl_easy_duphandle(curl_default);
475 #endif
476 }
477
478 active_requests++;
479 slot->in_use = 1;
480 slot->local = NULL;
481 slot->results = NULL;
482 slot->finished = NULL;
483 slot->callback_data = NULL;
484 slot->callback_func = NULL;
485 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
486 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
487 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
488 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
489 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
490 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
491 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
492
493 return slot;
494 }
495
496 int start_active_slot(struct active_request_slot *slot)
497 {
498 #ifdef USE_CURL_MULTI
499 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
500 int num_transfers;
501
502 if (curlm_result != CURLM_OK &&
503 curlm_result != CURLM_CALL_MULTI_PERFORM) {
504 active_requests--;
505 slot->in_use = 0;
506 return 0;
507 }
508
509 /*
510 * We know there must be something to do, since we just added
511 * something.
512 */
513 curl_multi_perform(curlm, &num_transfers);
514 #endif
515 return 1;
516 }
517
518 #ifdef USE_CURL_MULTI
519 struct fill_chain {
520 void *data;
521 int (*fill)(void *);
522 struct fill_chain *next;
523 };
524
525 static struct fill_chain *fill_cfg;
526
527 void add_fill_function(void *data, int (*fill)(void *))
528 {
529 struct fill_chain *new = xmalloc(sizeof(*new));
530 struct fill_chain **linkp = &fill_cfg;
531 new->data = data;
532 new->fill = fill;
533 new->next = NULL;
534 while (*linkp)
535 linkp = &(*linkp)->next;
536 *linkp = new;
537 }
538
539 void fill_active_slots(void)
540 {
541 struct active_request_slot *slot = active_queue_head;
542
543 while (active_requests < max_requests) {
544 struct fill_chain *fill;
545 for (fill = fill_cfg; fill; fill = fill->next)
546 if (fill->fill(fill->data))
547 break;
548
549 if (!fill)
550 break;
551 }
552
553 while (slot != NULL) {
554 if (!slot->in_use && slot->curl != NULL) {
555 curl_easy_cleanup(slot->curl);
556 slot->curl = NULL;
557 }
558 slot = slot->next;
559 }
560 }
561
562 void step_active_slots(void)
563 {
564 int num_transfers;
565 CURLMcode curlm_result;
566
567 do {
568 curlm_result = curl_multi_perform(curlm, &num_transfers);
569 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
570 if (num_transfers < active_requests) {
571 process_curl_messages();
572 fill_active_slots();
573 }
574 }
575 #endif
576
577 void run_active_slot(struct active_request_slot *slot)
578 {
579 #ifdef USE_CURL_MULTI
580 long last_pos = 0;
581 long current_pos;
582 fd_set readfds;
583 fd_set writefds;
584 fd_set excfds;
585 int max_fd;
586 struct timeval select_timeout;
587 int finished = 0;
588
589 slot->finished = &finished;
590 while (!finished) {
591 data_received = 0;
592 step_active_slots();
593
594 if (!data_received && slot->local != NULL) {
595 current_pos = ftell(slot->local);
596 if (current_pos > last_pos)
597 data_received++;
598 last_pos = current_pos;
599 }
600
601 if (slot->in_use && !data_received) {
602 max_fd = 0;
603 FD_ZERO(&readfds);
604 FD_ZERO(&writefds);
605 FD_ZERO(&excfds);
606 select_timeout.tv_sec = 0;
607 select_timeout.tv_usec = 50000;
608 select(max_fd, &readfds, &writefds,
609 &excfds, &select_timeout);
610 }
611 }
612 #else
613 while (slot->in_use) {
614 slot->curl_result = curl_easy_perform(slot->curl);
615 finish_active_slot(slot);
616 }
617 #endif
618 }
619
620 static void closedown_active_slot(struct active_request_slot *slot)
621 {
622 active_requests--;
623 slot->in_use = 0;
624 }
625
626 void release_active_slot(struct active_request_slot *slot)
627 {
628 closedown_active_slot(slot);
629 if (slot->curl) {
630 #ifdef USE_CURL_MULTI
631 curl_multi_remove_handle(curlm, slot->curl);
632 #endif
633 curl_easy_cleanup(slot->curl);
634 slot->curl = NULL;
635 }
636 #ifdef USE_CURL_MULTI
637 fill_active_slots();
638 #endif
639 }
640
641 static void finish_active_slot(struct active_request_slot *slot)
642 {
643 closedown_active_slot(slot);
644 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
645
646 if (slot->finished != NULL)
647 (*slot->finished) = 1;
648
649 /* Store slot results so they can be read after the slot is reused */
650 if (slot->results != NULL) {
651 slot->results->curl_result = slot->curl_result;
652 slot->results->http_code = slot->http_code;
653 }
654
655 /* Run callback if appropriate */
656 if (slot->callback_func != NULL)
657 slot->callback_func(slot->callback_data);
658 }
659
660 void finish_all_active_slots(void)
661 {
662 struct active_request_slot *slot = active_queue_head;
663
664 while (slot != NULL)
665 if (slot->in_use) {
666 run_active_slot(slot);
667 slot = active_queue_head;
668 } else {
669 slot = slot->next;
670 }
671 }
672
673 /* Helpers for modifying and creating URLs */
674 static inline int needs_quote(int ch)
675 {
676 if (((ch >= 'A') && (ch <= 'Z'))
677 || ((ch >= 'a') && (ch <= 'z'))
678 || ((ch >= '0') && (ch <= '9'))
679 || (ch == '/')
680 || (ch == '-')
681 || (ch == '.'))
682 return 0;
683 return 1;
684 }
685
686 static inline int hex(int v)
687 {
688 if (v < 10)
689 return '0' + v;
690 else
691 return 'A' + v - 10;
692 }
693
694 static void end_url_with_slash(struct strbuf *buf, const char *url)
695 {
696 strbuf_addstr(buf, url);
697 if (buf->len && buf->buf[buf->len - 1] != '/')
698 strbuf_addstr(buf, "/");
699 }
700
701 static char *quote_ref_url(const char *base, const char *ref)
702 {
703 struct strbuf buf = STRBUF_INIT;
704 const char *cp;
705 int ch;
706
707 end_url_with_slash(&buf, base);
708
709 for (cp = ref; (ch = *cp) != 0; cp++)
710 if (needs_quote(ch))
711 strbuf_addf(&buf, "%%%02x", ch);
712 else
713 strbuf_addch(&buf, *cp);
714
715 return strbuf_detach(&buf, NULL);
716 }
717
718 void append_remote_object_url(struct strbuf *buf, const char *url,
719 const char *hex,
720 int only_two_digit_prefix)
721 {
722 end_url_with_slash(buf, url);
723
724 strbuf_addf(buf, "objects/%.*s/", 2, hex);
725 if (!only_two_digit_prefix)
726 strbuf_addf(buf, "%s", hex+2);
727 }
728
729 char *get_remote_object_url(const char *url, const char *hex,
730 int only_two_digit_prefix)
731 {
732 struct strbuf buf = STRBUF_INIT;
733 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
734 return strbuf_detach(&buf, NULL);
735 }
736
737 /* http_request() targets */
738 #define HTTP_REQUEST_STRBUF 0
739 #define HTTP_REQUEST_FILE 1
740
741 static int http_request(const char *url, void *result, int target, int options)
742 {
743 struct active_request_slot *slot;
744 struct slot_results results;
745 struct curl_slist *headers = NULL;
746 struct strbuf buf = STRBUF_INIT;
747 int ret;
748
749 slot = get_active_slot();
750 slot->results = &results;
751 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
752
753 if (result == NULL) {
754 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
755 } else {
756 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
757 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
758
759 if (target == HTTP_REQUEST_FILE) {
760 long posn = ftell(result);
761 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
762 fwrite);
763 if (posn > 0) {
764 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
765 headers = curl_slist_append(headers, buf.buf);
766 strbuf_reset(&buf);
767 }
768 slot->local = result;
769 } else
770 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
771 fwrite_buffer);
772 }
773
774 strbuf_addstr(&buf, "Pragma:");
775 if (options & HTTP_NO_CACHE)
776 strbuf_addstr(&buf, " no-cache");
777
778 headers = curl_slist_append(headers, buf.buf);
779
780 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
781 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
782
783 if (start_active_slot(slot)) {
784 run_active_slot(slot);
785 if (results.curl_result == CURLE_OK)
786 ret = HTTP_OK;
787 else if (missing_target(&results))
788 ret = HTTP_MISSING_TARGET;
789 else
790 ret = HTTP_ERROR;
791 } else {
792 error("Unable to start HTTP request for %s", url);
793 ret = HTTP_START_FAILED;
794 }
795
796 slot->local = NULL;
797 curl_slist_free_all(headers);
798 strbuf_release(&buf);
799
800 return ret;
801 }
802
803 int http_get_strbuf(const char *url, struct strbuf *result, int options)
804 {
805 return http_request(url, result, HTTP_REQUEST_STRBUF, options);
806 }
807
808 int http_get_file(const char *url, const char *filename, int options)
809 {
810 int ret;
811 struct strbuf tmpfile = STRBUF_INIT;
812 FILE *result;
813
814 strbuf_addf(&tmpfile, "%s.temp", filename);
815 result = fopen(tmpfile.buf, "a");
816 if (! result) {
817 error("Unable to open local file %s", tmpfile.buf);
818 ret = HTTP_ERROR;
819 goto cleanup;
820 }
821
822 ret = http_request(url, result, HTTP_REQUEST_FILE, options);
823 fclose(result);
824
825 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
826 ret = HTTP_ERROR;
827 cleanup:
828 strbuf_release(&tmpfile);
829 return ret;
830 }
831
832 int http_error(const char *url, int ret)
833 {
834 /* http_request has already handled HTTP_START_FAILED. */
835 if (ret != HTTP_START_FAILED)
836 error("%s while accessing %s\n", curl_errorstr, url);
837
838 return ret;
839 }
840
841 int http_fetch_ref(const char *base, struct ref *ref)
842 {
843 char *url;
844 struct strbuf buffer = STRBUF_INIT;
845 int ret = -1;
846
847 url = quote_ref_url(base, ref->name);
848 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
849 strbuf_rtrim(&buffer);
850 if (buffer.len == 40)
851 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
852 else if (!prefixcmp(buffer.buf, "ref: ")) {
853 ref->symref = xstrdup(buffer.buf + 5);
854 ret = 0;
855 }
856 }
857
858 strbuf_release(&buffer);
859 free(url);
860 return ret;
861 }
862
863 /* Helpers for fetching packs */
864 static int fetch_pack_index(unsigned char *sha1, const char *base_url)
865 {
866 int ret = 0;
867 char *hex = xstrdup(sha1_to_hex(sha1));
868 char *filename;
869 char *url;
870 struct strbuf buf = STRBUF_INIT;
871
872 /* Don't use the index if the pack isn't there */
873 end_url_with_slash(&buf, base_url);
874 strbuf_addf(&buf, "objects/pack/pack-%s.pack", hex);
875 url = strbuf_detach(&buf, 0);
876
877 if (http_get_strbuf(url, NULL, 0)) {
878 ret = error("Unable to verify pack %s is available",
879 hex);
880 goto cleanup;
881 }
882
883 if (has_pack_index(sha1)) {
884 ret = 0;
885 goto cleanup;
886 }
887
888 if (http_is_verbose)
889 fprintf(stderr, "Getting index for pack %s\n", hex);
890
891 end_url_with_slash(&buf, base_url);
892 strbuf_addf(&buf, "objects/pack/pack-%s.idx", hex);
893 url = strbuf_detach(&buf, NULL);
894
895 filename = sha1_pack_index_name(sha1);
896 if (http_get_file(url, filename, 0) != HTTP_OK)
897 ret = error("Unable to get pack index %s\n", url);
898
899 cleanup:
900 free(hex);
901 free(url);
902 return ret;
903 }
904
905 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
906 unsigned char *sha1, const char *base_url)
907 {
908 struct packed_git *new_pack;
909
910 if (fetch_pack_index(sha1, base_url))
911 return -1;
912
913 new_pack = parse_pack_index(sha1);
914 if (!new_pack)
915 return -1; /* parse_pack_index() already issued error message */
916 new_pack->next = *packs_head;
917 *packs_head = new_pack;
918 return 0;
919 }
920
921 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
922 {
923 int ret = 0, i = 0;
924 char *url, *data;
925 struct strbuf buf = STRBUF_INIT;
926 unsigned char sha1[20];
927
928 end_url_with_slash(&buf, base_url);
929 strbuf_addstr(&buf, "objects/info/packs");
930 url = strbuf_detach(&buf, NULL);
931
932 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
933 if (ret != HTTP_OK)
934 goto cleanup;
935
936 data = buf.buf;
937 while (i < buf.len) {
938 switch (data[i]) {
939 case 'P':
940 i++;
941 if (i + 52 <= buf.len &&
942 !prefixcmp(data + i, " pack-") &&
943 !prefixcmp(data + i + 46, ".pack\n")) {
944 get_sha1_hex(data + i + 6, sha1);
945 fetch_and_setup_pack_index(packs_head, sha1,
946 base_url);
947 i += 51;
948 break;
949 }
950 default:
951 while (i < buf.len && data[i] != '\n')
952 i++;
953 }
954 i++;
955 }
956
957 cleanup:
958 free(url);
959 return ret;
960 }
961
962 void release_http_pack_request(struct http_pack_request *preq)
963 {
964 if (preq->packfile != NULL) {
965 fclose(preq->packfile);
966 preq->packfile = NULL;
967 preq->slot->local = NULL;
968 }
969 if (preq->range_header != NULL) {
970 curl_slist_free_all(preq->range_header);
971 preq->range_header = NULL;
972 }
973 preq->slot = NULL;
974 free(preq->url);
975 }
976
977 int finish_http_pack_request(struct http_pack_request *preq)
978 {
979 int ret;
980 struct packed_git **lst;
981
982 preq->target->pack_size = ftell(preq->packfile);
983
984 if (preq->packfile != NULL) {
985 fclose(preq->packfile);
986 preq->packfile = NULL;
987 preq->slot->local = NULL;
988 }
989
990 ret = move_temp_to_file(preq->tmpfile, preq->filename);
991 if (ret)
992 return ret;
993
994 lst = preq->lst;
995 while (*lst != preq->target)
996 lst = &((*lst)->next);
997 *lst = (*lst)->next;
998
999 if (verify_pack(preq->target))
1000 return -1;
1001 install_packed_git(preq->target);
1002
1003 return 0;
1004 }
1005
1006 struct http_pack_request *new_http_pack_request(
1007 struct packed_git *target, const char *base_url)
1008 {
1009 char *filename;
1010 long prev_posn = 0;
1011 char range[RANGE_HEADER_SIZE];
1012 struct strbuf buf = STRBUF_INIT;
1013 struct http_pack_request *preq;
1014
1015 preq = xmalloc(sizeof(*preq));
1016 preq->target = target;
1017 preq->range_header = NULL;
1018
1019 end_url_with_slash(&buf, base_url);
1020 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1021 sha1_to_hex(target->sha1));
1022 preq->url = strbuf_detach(&buf, NULL);
1023
1024 filename = sha1_pack_name(target->sha1);
1025 snprintf(preq->filename, sizeof(preq->filename), "%s", filename);
1026 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp", filename);
1027 preq->packfile = fopen(preq->tmpfile, "a");
1028 if (!preq->packfile) {
1029 error("Unable to open local file %s for pack",
1030 preq->tmpfile);
1031 goto abort;
1032 }
1033
1034 preq->slot = get_active_slot();
1035 preq->slot->local = preq->packfile;
1036 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1037 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1038 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1039 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1040 no_pragma_header);
1041
1042 /*
1043 * If there is data present from a previous transfer attempt,
1044 * resume where it left off
1045 */
1046 prev_posn = ftell(preq->packfile);
1047 if (prev_posn>0) {
1048 if (http_is_verbose)
1049 fprintf(stderr,
1050 "Resuming fetch of pack %s at byte %ld\n",
1051 sha1_to_hex(target->sha1), prev_posn);
1052 sprintf(range, "Range: bytes=%ld-", prev_posn);
1053 preq->range_header = curl_slist_append(NULL, range);
1054 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1055 preq->range_header);
1056 }
1057
1058 return preq;
1059
1060 abort:
1061 free(filename);
1062 free(preq->url);
1063 free(preq);
1064 return NULL;
1065 }
1066
1067 /* Helpers for fetching objects (loose) */
1068 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
1069 void *data)
1070 {
1071 unsigned char expn[4096];
1072 size_t size = eltsize * nmemb;
1073 int posn = 0;
1074 struct http_object_request *freq =
1075 (struct http_object_request *)data;
1076 do {
1077 ssize_t retval = xwrite(freq->localfile,
1078 (char *) ptr + posn, size - posn);
1079 if (retval < 0)
1080 return posn;
1081 posn += retval;
1082 } while (posn < size);
1083
1084 freq->stream.avail_in = size;
1085 freq->stream.next_in = ptr;
1086 do {
1087 freq->stream.next_out = expn;
1088 freq->stream.avail_out = sizeof(expn);
1089 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1090 git_SHA1_Update(&freq->c, expn,
1091 sizeof(expn) - freq->stream.avail_out);
1092 } while (freq->stream.avail_in && freq->zret == Z_OK);
1093 data_received++;
1094 return size;
1095 }
1096
1097 struct http_object_request *new_http_object_request(const char *base_url,
1098 unsigned char *sha1)
1099 {
1100 char *hex = sha1_to_hex(sha1);
1101 char *filename;
1102 char prevfile[PATH_MAX];
1103 int prevlocal;
1104 unsigned char prev_buf[PREV_BUF_SIZE];
1105 ssize_t prev_read = 0;
1106 long prev_posn = 0;
1107 char range[RANGE_HEADER_SIZE];
1108 struct curl_slist *range_header = NULL;
1109 struct http_object_request *freq;
1110
1111 freq = xmalloc(sizeof(*freq));
1112 hashcpy(freq->sha1, sha1);
1113 freq->localfile = -1;
1114
1115 filename = sha1_file_name(sha1);
1116 snprintf(freq->filename, sizeof(freq->filename), "%s", filename);
1117 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1118 "%s.temp", filename);
1119
1120 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1121 unlink_or_warn(prevfile);
1122 rename(freq->tmpfile, prevfile);
1123 unlink_or_warn(freq->tmpfile);
1124
1125 if (freq->localfile != -1)
1126 error("fd leakage in start: %d", freq->localfile);
1127 freq->localfile = open(freq->tmpfile,
1128 O_WRONLY | O_CREAT | O_EXCL, 0666);
1129 /*
1130 * This could have failed due to the "lazy directory creation";
1131 * try to mkdir the last path component.
1132 */
1133 if (freq->localfile < 0 && errno == ENOENT) {
1134 char *dir = strrchr(freq->tmpfile, '/');
1135 if (dir) {
1136 *dir = 0;
1137 mkdir(freq->tmpfile, 0777);
1138 *dir = '/';
1139 }
1140 freq->localfile = open(freq->tmpfile,
1141 O_WRONLY | O_CREAT | O_EXCL, 0666);
1142 }
1143
1144 if (freq->localfile < 0) {
1145 error("Couldn't create temporary file %s for %s: %s",
1146 freq->tmpfile, freq->filename, strerror(errno));
1147 goto abort;
1148 }
1149
1150 memset(&freq->stream, 0, sizeof(freq->stream));
1151
1152 git_inflate_init(&freq->stream);
1153
1154 git_SHA1_Init(&freq->c);
1155
1156 freq->url = get_remote_object_url(base_url, hex, 0);
1157
1158 /*
1159 * If a previous temp file is present, process what was already
1160 * fetched.
1161 */
1162 prevlocal = open(prevfile, O_RDONLY);
1163 if (prevlocal != -1) {
1164 do {
1165 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1166 if (prev_read>0) {
1167 if (fwrite_sha1_file(prev_buf,
1168 1,
1169 prev_read,
1170 freq) == prev_read) {
1171 prev_posn += prev_read;
1172 } else {
1173 prev_read = -1;
1174 }
1175 }
1176 } while (prev_read > 0);
1177 close(prevlocal);
1178 }
1179 unlink_or_warn(prevfile);
1180
1181 /*
1182 * Reset inflate/SHA1 if there was an error reading the previous temp
1183 * file; also rewind to the beginning of the local file.
1184 */
1185 if (prev_read == -1) {
1186 memset(&freq->stream, 0, sizeof(freq->stream));
1187 git_inflate_init(&freq->stream);
1188 git_SHA1_Init(&freq->c);
1189 if (prev_posn>0) {
1190 prev_posn = 0;
1191 lseek(freq->localfile, 0, SEEK_SET);
1192 if (ftruncate(freq->localfile, 0) < 0) {
1193 error("Couldn't truncate temporary file %s for %s: %s",
1194 freq->tmpfile, freq->filename, strerror(errno));
1195 goto abort;
1196 }
1197 }
1198 }
1199
1200 freq->slot = get_active_slot();
1201
1202 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1203 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1204 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1205 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1206 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1207
1208 /*
1209 * If we have successfully processed data from a previous fetch
1210 * attempt, only fetch the data we don't already have.
1211 */
1212 if (prev_posn>0) {
1213 if (http_is_verbose)
1214 fprintf(stderr,
1215 "Resuming fetch of object %s at byte %ld\n",
1216 hex, prev_posn);
1217 sprintf(range, "Range: bytes=%ld-", prev_posn);
1218 range_header = curl_slist_append(range_header, range);
1219 curl_easy_setopt(freq->slot->curl,
1220 CURLOPT_HTTPHEADER, range_header);
1221 }
1222
1223 return freq;
1224
1225 abort:
1226 free(filename);
1227 free(freq->url);
1228 free(freq);
1229 return NULL;
1230 }
1231
1232 void process_http_object_request(struct http_object_request *freq)
1233 {
1234 if (freq->slot == NULL)
1235 return;
1236 freq->curl_result = freq->slot->curl_result;
1237 freq->http_code = freq->slot->http_code;
1238 freq->slot = NULL;
1239 }
1240
1241 int finish_http_object_request(struct http_object_request *freq)
1242 {
1243 struct stat st;
1244
1245 close(freq->localfile);
1246 freq->localfile = -1;
1247
1248 process_http_object_request(freq);
1249
1250 if (freq->http_code == 416) {
1251 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
1252 } else if (freq->curl_result != CURLE_OK) {
1253 if (stat(freq->tmpfile, &st) == 0)
1254 if (st.st_size == 0)
1255 unlink_or_warn(freq->tmpfile);
1256 return -1;
1257 }
1258
1259 git_inflate_end(&freq->stream);
1260 git_SHA1_Final(freq->real_sha1, &freq->c);
1261 if (freq->zret != Z_STREAM_END) {
1262 unlink_or_warn(freq->tmpfile);
1263 return -1;
1264 }
1265 if (hashcmp(freq->sha1, freq->real_sha1)) {
1266 unlink_or_warn(freq->tmpfile);
1267 return -1;
1268 }
1269 freq->rename =
1270 move_temp_to_file(freq->tmpfile, freq->filename);
1271
1272 return freq->rename;
1273 }
1274
1275 void abort_http_object_request(struct http_object_request *freq)
1276 {
1277 unlink_or_warn(freq->tmpfile);
1278
1279 release_http_object_request(freq);
1280 }
1281
1282 void release_http_object_request(struct http_object_request *freq)
1283 {
1284 if (freq->localfile != -1) {
1285 close(freq->localfile);
1286 freq->localfile = -1;
1287 }
1288 if (freq->url != NULL) {
1289 free(freq->url);
1290 freq->url = NULL;
1291 }
1292 if (freq->slot != NULL) {
1293 freq->slot->callback_func = NULL;
1294 freq->slot->callback_data = NULL;
1295 release_active_slot(freq->slot);
1296 freq->slot = NULL;
1297 }
1298 }
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