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Post 2.3 cyle (batch #5)
[git.git] / http.c
blob0153fb0b626d1fc28eba1bece2406b64fcaa0ecb
1 #include "git-compat-util.h"
2 #include "http.h"
3 #include "pack.h"
4 #include "sideband.h"
5 #include "run-command.h"
6 #include "url.h"
7 #include "urlmatch.h"
8 #include "credential.h"
9 #include "version.h"
10 #include "pkt-line.h"
11
12 int active_requests;
13 int http_is_verbose;
14 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
15
16 #if LIBCURL_VERSION_NUM >= 0x070a06
17 #define LIBCURL_CAN_HANDLE_AUTH_ANY
18 #endif
19
20 static int min_curl_sessions = 1;
21 static int curl_session_count;
22 #ifdef USE_CURL_MULTI
23 static int max_requests = -1;
24 static CURLM *curlm;
25 #endif
26 #ifndef NO_CURL_EASY_DUPHANDLE
27 static CURL *curl_default;
28 #endif
29
30 #define PREV_BUF_SIZE 4096
31 #define RANGE_HEADER_SIZE 30
32
33 char curl_errorstr[CURL_ERROR_SIZE];
34
35 static int curl_ssl_verify = -1;
36 static int curl_ssl_try;
37 static const char *ssl_cert;
38 #if LIBCURL_VERSION_NUM >= 0x070903
39 static const char *ssl_key;
40 #endif
41 #if LIBCURL_VERSION_NUM >= 0x070908
42 static const char *ssl_capath;
43 #endif
44 static const char *ssl_cainfo;
45 static long curl_low_speed_limit = -1;
46 static long curl_low_speed_time = -1;
47 static int curl_ftp_no_epsv;
48 static const char *curl_http_proxy;
49 static const char *curl_cookie_file;
50 static int curl_save_cookies;
51 struct credential http_auth = CREDENTIAL_INIT;
52 static int http_proactive_auth;
53 static const char *user_agent;
54
55 #if LIBCURL_VERSION_NUM >= 0x071700
56 /* Use CURLOPT_KEYPASSWD as is */
57 #elif LIBCURL_VERSION_NUM >= 0x070903
58 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
59 #else
60 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
61 #endif
62
63 static struct credential cert_auth = CREDENTIAL_INIT;
64 static int ssl_cert_password_required;
65 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
66 static unsigned long http_auth_methods = CURLAUTH_ANY;
67 #endif
68
69 static struct curl_slist *pragma_header;
70 static struct curl_slist *no_pragma_header;
71
72 static struct active_request_slot *active_queue_head;
73
74 static char *cached_accept_language;
75
76 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
77 {
78 size_t size = eltsize * nmemb;
79 struct buffer *buffer = buffer_;
80
81 if (size > buffer->buf.len - buffer->posn)
82 size = buffer->buf.len - buffer->posn;
83 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
84 buffer->posn += size;
85
86 return size;
87 }
88
89 #ifndef NO_CURL_IOCTL
90 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
91 {
92 struct buffer *buffer = clientp;
93
94 switch (cmd) {
95 case CURLIOCMD_NOP:
96 return CURLIOE_OK;
97
98 case CURLIOCMD_RESTARTREAD:
99 buffer->posn = 0;
100 return CURLIOE_OK;
101
102 default:
103 return CURLIOE_UNKNOWNCMD;
104 }
105 }
106 #endif
107
108 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
109 {
110 size_t size = eltsize * nmemb;
111 struct strbuf *buffer = buffer_;
112
113 strbuf_add(buffer, ptr, size);
114 return size;
115 }
116
117 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
118 {
119 return eltsize * nmemb;
120 }
121
122 static void closedown_active_slot(struct active_request_slot *slot)
123 {
124 active_requests--;
125 slot->in_use = 0;
126 }
127
128 static void finish_active_slot(struct active_request_slot *slot)
129 {
130 closedown_active_slot(slot);
131 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
132
133 if (slot->finished != NULL)
134 (*slot->finished) = 1;
135
136 /* Store slot results so they can be read after the slot is reused */
137 if (slot->results != NULL) {
138 slot->results->curl_result = slot->curl_result;
139 slot->results->http_code = slot->http_code;
140 #if LIBCURL_VERSION_NUM >= 0x070a08
141 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
142 &slot->results->auth_avail);
143 #else
144 slot->results->auth_avail = 0;
145 #endif
146 }
147
148 /* Run callback if appropriate */
149 if (slot->callback_func != NULL)
150 slot->callback_func(slot->callback_data);
151 }
152
153 #ifdef USE_CURL_MULTI
154 static void process_curl_messages(void)
155 {
156 int num_messages;
157 struct active_request_slot *slot;
158 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
159
160 while (curl_message != NULL) {
161 if (curl_message->msg == CURLMSG_DONE) {
162 int curl_result = curl_message->data.result;
163 slot = active_queue_head;
164 while (slot != NULL &&
165 slot->curl != curl_message->easy_handle)
166 slot = slot->next;
167 if (slot != NULL) {
168 curl_multi_remove_handle(curlm, slot->curl);
169 slot->curl_result = curl_result;
170 finish_active_slot(slot);
171 } else {
172 fprintf(stderr, "Received DONE message for unknown request!\n");
173 }
174 } else {
175 fprintf(stderr, "Unknown CURL message received: %d\n",
176 (int)curl_message->msg);
177 }
178 curl_message = curl_multi_info_read(curlm, &num_messages);
179 }
180 }
181 #endif
182
183 static int http_options(const char *var, const char *value, void *cb)
184 {
185 if (!strcmp("http.sslverify", var)) {
186 curl_ssl_verify = git_config_bool(var, value);
187 return 0;
188 }
189 if (!strcmp("http.sslcert", var))
190 return git_config_string(&ssl_cert, var, value);
191 #if LIBCURL_VERSION_NUM >= 0x070903
192 if (!strcmp("http.sslkey", var))
193 return git_config_string(&ssl_key, var, value);
194 #endif
195 #if LIBCURL_VERSION_NUM >= 0x070908
196 if (!strcmp("http.sslcapath", var))
197 return git_config_string(&ssl_capath, var, value);
198 #endif
199 if (!strcmp("http.sslcainfo", var))
200 return git_config_string(&ssl_cainfo, var, value);
201 if (!strcmp("http.sslcertpasswordprotected", var)) {
202 ssl_cert_password_required = git_config_bool(var, value);
203 return 0;
204 }
205 if (!strcmp("http.ssltry", var)) {
206 curl_ssl_try = git_config_bool(var, value);
207 return 0;
208 }
209 if (!strcmp("http.minsessions", var)) {
210 min_curl_sessions = git_config_int(var, value);
211 #ifndef USE_CURL_MULTI
212 if (min_curl_sessions > 1)
213 min_curl_sessions = 1;
214 #endif
215 return 0;
216 }
217 #ifdef USE_CURL_MULTI
218 if (!strcmp("http.maxrequests", var)) {
219 max_requests = git_config_int(var, value);
220 return 0;
221 }
222 #endif
223 if (!strcmp("http.lowspeedlimit", var)) {
224 curl_low_speed_limit = (long)git_config_int(var, value);
225 return 0;
226 }
227 if (!strcmp("http.lowspeedtime", var)) {
228 curl_low_speed_time = (long)git_config_int(var, value);
229 return 0;
230 }
231
232 if (!strcmp("http.noepsv", var)) {
233 curl_ftp_no_epsv = git_config_bool(var, value);
234 return 0;
235 }
236 if (!strcmp("http.proxy", var))
237 return git_config_string(&curl_http_proxy, var, value);
238
239 if (!strcmp("http.cookiefile", var))
240 return git_config_string(&curl_cookie_file, var, value);
241 if (!strcmp("http.savecookies", var)) {
242 curl_save_cookies = git_config_bool(var, value);
243 return 0;
244 }
245
246 if (!strcmp("http.postbuffer", var)) {
247 http_post_buffer = git_config_int(var, value);
248 if (http_post_buffer < LARGE_PACKET_MAX)
249 http_post_buffer = LARGE_PACKET_MAX;
250 return 0;
251 }
252
253 if (!strcmp("http.useragent", var))
254 return git_config_string(&user_agent, var, value);
255
256 /* Fall back on the default ones */
257 return git_default_config(var, value, cb);
258 }
259
260 static void init_curl_http_auth(CURL *result)
261 {
262 if (!http_auth.username)
263 return;
264
265 credential_fill(&http_auth);
266
267 #if LIBCURL_VERSION_NUM >= 0x071301
268 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
269 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
270 #else
271 {
272 static struct strbuf up = STRBUF_INIT;
273 /*
274 * Note that we assume we only ever have a single set of
275 * credentials in a given program run, so we do not have
276 * to worry about updating this buffer, only setting its
277 * initial value.
278 */
279 if (!up.len)
280 strbuf_addf(&up, "%s:%s",
281 http_auth.username, http_auth.password);
282 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
283 }
284 #endif
285 }
286
287 static int has_cert_password(void)
288 {
289 if (ssl_cert == NULL || ssl_cert_password_required != 1)
290 return 0;
291 if (!cert_auth.password) {
292 cert_auth.protocol = xstrdup("cert");
293 cert_auth.username = xstrdup("");
294 cert_auth.path = xstrdup(ssl_cert);
295 credential_fill(&cert_auth);
296 }
297 return 1;
298 }
299
300 #if LIBCURL_VERSION_NUM >= 0x071900
301 static void set_curl_keepalive(CURL *c)
302 {
303 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
304 }
305
306 #elif LIBCURL_VERSION_NUM >= 0x071000
307 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
308 {
309 int ka = 1;
310 int rc;
311 socklen_t len = (socklen_t)sizeof(ka);
312
313 if (type != CURLSOCKTYPE_IPCXN)
314 return 0;
315
316 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
317 if (rc < 0)
318 warning("unable to set SO_KEEPALIVE on socket %s",
319 strerror(errno));
320
321 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
322 }
323
324 static void set_curl_keepalive(CURL *c)
325 {
326 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
327 }
328
329 #else
330 static void set_curl_keepalive(CURL *c)
331 {
332 /* not supported on older curl versions */
333 }
334 #endif
335
336 static CURL *get_curl_handle(void)
337 {
338 CURL *result = curl_easy_init();
339
340 if (!result)
341 die("curl_easy_init failed");
342
343 if (!curl_ssl_verify) {
344 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
345 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
346 } else {
347 /* Verify authenticity of the peer's certificate */
348 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
349 /* The name in the cert must match whom we tried to connect */
350 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
351 }
352
353 #if LIBCURL_VERSION_NUM >= 0x070907
354 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
355 #endif
356 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
357 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
358 #endif
359
360 if (http_proactive_auth)
361 init_curl_http_auth(result);
362
363 if (ssl_cert != NULL)
364 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
365 if (has_cert_password())
366 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
367 #if LIBCURL_VERSION_NUM >= 0x070903
368 if (ssl_key != NULL)
369 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
370 #endif
371 #if LIBCURL_VERSION_NUM >= 0x070908
372 if (ssl_capath != NULL)
373 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
374 #endif
375 if (ssl_cainfo != NULL)
376 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
377
378 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
379 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
380 curl_low_speed_limit);
381 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
382 curl_low_speed_time);
383 }
384
385 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
386 #if LIBCURL_VERSION_NUM >= 0x071301
387 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
388 #elif LIBCURL_VERSION_NUM >= 0x071101
389 curl_easy_setopt(result, CURLOPT_POST301, 1);
390 #endif
391
392 if (getenv("GIT_CURL_VERBOSE"))
393 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
394
395 curl_easy_setopt(result, CURLOPT_USERAGENT,
396 user_agent ? user_agent : git_user_agent());
397
398 if (curl_ftp_no_epsv)
399 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
400
401 #ifdef CURLOPT_USE_SSL
402 if (curl_ssl_try)
403 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
404 #endif
405
406 if (curl_http_proxy) {
407 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
408 #if LIBCURL_VERSION_NUM >= 0x070a07
409 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
410 #endif
411 }
412
413 set_curl_keepalive(result);
414
415 return result;
416 }
417
418 static void set_from_env(const char **var, const char *envname)
419 {
420 const char *val = getenv(envname);
421 if (val)
422 *var = val;
423 }
424
425 void http_init(struct remote *remote, const char *url, int proactive_auth)
426 {
427 char *low_speed_limit;
428 char *low_speed_time;
429 char *normalized_url;
430 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
431
432 config.section = "http";
433 config.key = NULL;
434 config.collect_fn = http_options;
435 config.cascade_fn = git_default_config;
436 config.cb = NULL;
437
438 http_is_verbose = 0;
439 normalized_url = url_normalize(url, &config.url);
440
441 git_config(urlmatch_config_entry, &config);
442 free(normalized_url);
443
444 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
445 die("curl_global_init failed");
446
447 http_proactive_auth = proactive_auth;
448
449 if (remote && remote->http_proxy)
450 curl_http_proxy = xstrdup(remote->http_proxy);
451
452 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
453 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
454
455 #ifdef USE_CURL_MULTI
456 {
457 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
458 if (http_max_requests != NULL)
459 max_requests = atoi(http_max_requests);
460 }
461
462 curlm = curl_multi_init();
463 if (!curlm)
464 die("curl_multi_init failed");
465 #endif
466
467 if (getenv("GIT_SSL_NO_VERIFY"))
468 curl_ssl_verify = 0;
469
470 set_from_env(&ssl_cert, "GIT_SSL_CERT");
471 #if LIBCURL_VERSION_NUM >= 0x070903
472 set_from_env(&ssl_key, "GIT_SSL_KEY");
473 #endif
474 #if LIBCURL_VERSION_NUM >= 0x070908
475 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
476 #endif
477 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
478
479 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
480
481 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
482 if (low_speed_limit != NULL)
483 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
484 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
485 if (low_speed_time != NULL)
486 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
487
488 if (curl_ssl_verify == -1)
489 curl_ssl_verify = 1;
490
491 curl_session_count = 0;
492 #ifdef USE_CURL_MULTI
493 if (max_requests < 1)
494 max_requests = DEFAULT_MAX_REQUESTS;
495 #endif
496
497 if (getenv("GIT_CURL_FTP_NO_EPSV"))
498 curl_ftp_no_epsv = 1;
499
500 if (url) {
501 credential_from_url(&http_auth, url);
502 if (!ssl_cert_password_required &&
503 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
504 starts_with(url, "https://"))
505 ssl_cert_password_required = 1;
506 }
507
508 #ifndef NO_CURL_EASY_DUPHANDLE
509 curl_default = get_curl_handle();
510 #endif
511 }
512
513 void http_cleanup(void)
514 {
515 struct active_request_slot *slot = active_queue_head;
516
517 while (slot != NULL) {
518 struct active_request_slot *next = slot->next;
519 if (slot->curl != NULL) {
520 #ifdef USE_CURL_MULTI
521 curl_multi_remove_handle(curlm, slot->curl);
522 #endif
523 curl_easy_cleanup(slot->curl);
524 }
525 free(slot);
526 slot = next;
527 }
528 active_queue_head = NULL;
529
530 #ifndef NO_CURL_EASY_DUPHANDLE
531 curl_easy_cleanup(curl_default);
532 #endif
533
534 #ifdef USE_CURL_MULTI
535 curl_multi_cleanup(curlm);
536 #endif
537 curl_global_cleanup();
538
539 curl_slist_free_all(pragma_header);
540 pragma_header = NULL;
541
542 curl_slist_free_all(no_pragma_header);
543 no_pragma_header = NULL;
544
545 if (curl_http_proxy) {
546 free((void *)curl_http_proxy);
547 curl_http_proxy = NULL;
548 }
549
550 if (cert_auth.password != NULL) {
551 memset(cert_auth.password, 0, strlen(cert_auth.password));
552 free(cert_auth.password);
553 cert_auth.password = NULL;
554 }
555 ssl_cert_password_required = 0;
556
557 free(cached_accept_language);
558 cached_accept_language = NULL;
559 }
560
561 struct active_request_slot *get_active_slot(void)
562 {
563 struct active_request_slot *slot = active_queue_head;
564 struct active_request_slot *newslot;
565
566 #ifdef USE_CURL_MULTI
567 int num_transfers;
568
569 /* Wait for a slot to open up if the queue is full */
570 while (active_requests >= max_requests) {
571 curl_multi_perform(curlm, &num_transfers);
572 if (num_transfers < active_requests)
573 process_curl_messages();
574 }
575 #endif
576
577 while (slot != NULL && slot->in_use)
578 slot = slot->next;
579
580 if (slot == NULL) {
581 newslot = xmalloc(sizeof(*newslot));
582 newslot->curl = NULL;
583 newslot->in_use = 0;
584 newslot->next = NULL;
585
586 slot = active_queue_head;
587 if (slot == NULL) {
588 active_queue_head = newslot;
589 } else {
590 while (slot->next != NULL)
591 slot = slot->next;
592 slot->next = newslot;
593 }
594 slot = newslot;
595 }
596
597 if (slot->curl == NULL) {
598 #ifdef NO_CURL_EASY_DUPHANDLE
599 slot->curl = get_curl_handle();
600 #else
601 slot->curl = curl_easy_duphandle(curl_default);
602 #endif
603 curl_session_count++;
604 }
605
606 active_requests++;
607 slot->in_use = 1;
608 slot->results = NULL;
609 slot->finished = NULL;
610 slot->callback_data = NULL;
611 slot->callback_func = NULL;
612 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
613 if (curl_save_cookies)
614 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
615 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
616 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
617 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
618 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
619 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
620 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
621 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
622 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
623 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
624 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
625 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
626 #endif
627 if (http_auth.password)
628 init_curl_http_auth(slot->curl);
629
630 return slot;
631 }
632
633 int start_active_slot(struct active_request_slot *slot)
634 {
635 #ifdef USE_CURL_MULTI
636 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
637 int num_transfers;
638
639 if (curlm_result != CURLM_OK &&
640 curlm_result != CURLM_CALL_MULTI_PERFORM) {
641 active_requests--;
642 slot->in_use = 0;
643 return 0;
644 }
645
646 /*
647 * We know there must be something to do, since we just added
648 * something.
649 */
650 curl_multi_perform(curlm, &num_transfers);
651 #endif
652 return 1;
653 }
654
655 #ifdef USE_CURL_MULTI
656 struct fill_chain {
657 void *data;
658 int (*fill)(void *);
659 struct fill_chain *next;
660 };
661
662 static struct fill_chain *fill_cfg;
663
664 void add_fill_function(void *data, int (*fill)(void *))
665 {
666 struct fill_chain *new = xmalloc(sizeof(*new));
667 struct fill_chain **linkp = &fill_cfg;
668 new->data = data;
669 new->fill = fill;
670 new->next = NULL;
671 while (*linkp)
672 linkp = &(*linkp)->next;
673 *linkp = new;
674 }
675
676 void fill_active_slots(void)
677 {
678 struct active_request_slot *slot = active_queue_head;
679
680 while (active_requests < max_requests) {
681 struct fill_chain *fill;
682 for (fill = fill_cfg; fill; fill = fill->next)
683 if (fill->fill(fill->data))
684 break;
685
686 if (!fill)
687 break;
688 }
689
690 while (slot != NULL) {
691 if (!slot->in_use && slot->curl != NULL
692 && curl_session_count > min_curl_sessions) {
693 curl_easy_cleanup(slot->curl);
694 slot->curl = NULL;
695 curl_session_count--;
696 }
697 slot = slot->next;
698 }
699 }
700
701 void step_active_slots(void)
702 {
703 int num_transfers;
704 CURLMcode curlm_result;
705
706 do {
707 curlm_result = curl_multi_perform(curlm, &num_transfers);
708 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
709 if (num_transfers < active_requests) {
710 process_curl_messages();
711 fill_active_slots();
712 }
713 }
714 #endif
715
716 void run_active_slot(struct active_request_slot *slot)
717 {
718 #ifdef USE_CURL_MULTI
719 fd_set readfds;
720 fd_set writefds;
721 fd_set excfds;
722 int max_fd;
723 struct timeval select_timeout;
724 int finished = 0;
725
726 slot->finished = &finished;
727 while (!finished) {
728 step_active_slots();
729
730 if (slot->in_use) {
731 #if LIBCURL_VERSION_NUM >= 0x070f04
732 long curl_timeout;
733 curl_multi_timeout(curlm, &curl_timeout);
734 if (curl_timeout == 0) {
735 continue;
736 } else if (curl_timeout == -1) {
737 select_timeout.tv_sec = 0;
738 select_timeout.tv_usec = 50000;
739 } else {
740 select_timeout.tv_sec = curl_timeout / 1000;
741 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
742 }
743 #else
744 select_timeout.tv_sec = 0;
745 select_timeout.tv_usec = 50000;
746 #endif
747
748 max_fd = -1;
749 FD_ZERO(&readfds);
750 FD_ZERO(&writefds);
751 FD_ZERO(&excfds);
752 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
753
754 /*
755 * It can happen that curl_multi_timeout returns a pathologically
756 * long timeout when curl_multi_fdset returns no file descriptors
757 * to read. See commit message for more details.
758 */
759 if (max_fd < 0 &&
760 (select_timeout.tv_sec > 0 ||
761 select_timeout.tv_usec > 50000)) {
762 select_timeout.tv_sec = 0;
763 select_timeout.tv_usec = 50000;
764 }
765
766 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
767 }
768 }
769 #else
770 while (slot->in_use) {
771 slot->curl_result = curl_easy_perform(slot->curl);
772 finish_active_slot(slot);
773 }
774 #endif
775 }
776
777 static void release_active_slot(struct active_request_slot *slot)
778 {
779 closedown_active_slot(slot);
780 if (slot->curl && curl_session_count > min_curl_sessions) {
781 #ifdef USE_CURL_MULTI
782 curl_multi_remove_handle(curlm, slot->curl);
783 #endif
784 curl_easy_cleanup(slot->curl);
785 slot->curl = NULL;
786 curl_session_count--;
787 }
788 #ifdef USE_CURL_MULTI
789 fill_active_slots();
790 #endif
791 }
792
793 void finish_all_active_slots(void)
794 {
795 struct active_request_slot *slot = active_queue_head;
796
797 while (slot != NULL)
798 if (slot->in_use) {
799 run_active_slot(slot);
800 slot = active_queue_head;
801 } else {
802 slot = slot->next;
803 }
804 }
805
806 /* Helpers for modifying and creating URLs */
807 static inline int needs_quote(int ch)
808 {
809 if (((ch >= 'A') && (ch <= 'Z'))
810 || ((ch >= 'a') && (ch <= 'z'))
811 || ((ch >= '0') && (ch <= '9'))
812 || (ch == '/')
813 || (ch == '-')
814 || (ch == '.'))
815 return 0;
816 return 1;
817 }
818
819 static char *quote_ref_url(const char *base, const char *ref)
820 {
821 struct strbuf buf = STRBUF_INIT;
822 const char *cp;
823 int ch;
824
825 end_url_with_slash(&buf, base);
826
827 for (cp = ref; (ch = *cp) != 0; cp++)
828 if (needs_quote(ch))
829 strbuf_addf(&buf, "%%%02x", ch);
830 else
831 strbuf_addch(&buf, *cp);
832
833 return strbuf_detach(&buf, NULL);
834 }
835
836 void append_remote_object_url(struct strbuf *buf, const char *url,
837 const char *hex,
838 int only_two_digit_prefix)
839 {
840 end_url_with_slash(buf, url);
841
842 strbuf_addf(buf, "objects/%.*s/", 2, hex);
843 if (!only_two_digit_prefix)
844 strbuf_addf(buf, "%s", hex+2);
845 }
846
847 char *get_remote_object_url(const char *url, const char *hex,
848 int only_two_digit_prefix)
849 {
850 struct strbuf buf = STRBUF_INIT;
851 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
852 return strbuf_detach(&buf, NULL);
853 }
854
855 static int handle_curl_result(struct slot_results *results)
856 {
857 /*
858 * If we see a failing http code with CURLE_OK, we have turned off
859 * FAILONERROR (to keep the server's custom error response), and should
860 * translate the code into failure here.
861 */
862 if (results->curl_result == CURLE_OK &&
863 results->http_code >= 400) {
864 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
865 /*
866 * Normally curl will already have put the "reason phrase"
867 * from the server into curl_errorstr; unfortunately without
868 * FAILONERROR it is lost, so we can give only the numeric
869 * status code.
870 */
871 snprintf(curl_errorstr, sizeof(curl_errorstr),
872 "The requested URL returned error: %ld",
873 results->http_code);
874 }
875
876 if (results->curl_result == CURLE_OK) {
877 credential_approve(&http_auth);
878 return HTTP_OK;
879 } else if (missing_target(results))
880 return HTTP_MISSING_TARGET;
881 else if (results->http_code == 401) {
882 if (http_auth.username && http_auth.password) {
883 credential_reject(&http_auth);
884 return HTTP_NOAUTH;
885 } else {
886 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
887 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
888 #endif
889 return HTTP_REAUTH;
890 }
891 } else {
892 #if LIBCURL_VERSION_NUM >= 0x070c00
893 if (!curl_errorstr[0])
894 strlcpy(curl_errorstr,
895 curl_easy_strerror(results->curl_result),
896 sizeof(curl_errorstr));
897 #endif
898 return HTTP_ERROR;
899 }
900 }
901
902 int run_one_slot(struct active_request_slot *slot,
903 struct slot_results *results)
904 {
905 slot->results = results;
906 if (!start_active_slot(slot)) {
907 snprintf(curl_errorstr, sizeof(curl_errorstr),
908 "failed to start HTTP request");
909 return HTTP_START_FAILED;
910 }
911
912 run_active_slot(slot);
913 return handle_curl_result(results);
914 }
915
916 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
917 {
918 char *ptr;
919 CURLcode ret;
920
921 strbuf_reset(buf);
922 ret = curl_easy_getinfo(curl, info, &ptr);
923 if (!ret && ptr)
924 strbuf_addstr(buf, ptr);
925 return ret;
926 }
927
928 /*
929 * Check for and extract a content-type parameter. "raw"
930 * should be positioned at the start of the potential
931 * parameter, with any whitespace already removed.
932 *
933 * "name" is the name of the parameter. The value is appended
934 * to "out".
935 */
936 static int extract_param(const char *raw, const char *name,
937 struct strbuf *out)
938 {
939 size_t len = strlen(name);
940
941 if (strncasecmp(raw, name, len))
942 return -1;
943 raw += len;
944
945 if (*raw != '=')
946 return -1;
947 raw++;
948
949 while (*raw && !isspace(*raw) && *raw != ';')
950 strbuf_addch(out, *raw++);
951 return 0;
952 }
953
954 /*
955 * Extract a normalized version of the content type, with any
956 * spaces suppressed, all letters lowercased, and no trailing ";"
957 * or parameters.
958 *
959 * Note that we will silently remove even invalid whitespace. For
960 * example, "text / plain" is specifically forbidden by RFC 2616,
961 * but "text/plain" is the only reasonable output, and this keeps
962 * our code simple.
963 *
964 * If the "charset" argument is not NULL, store the value of any
965 * charset parameter there.
966 *
967 * Example:
968 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
969 * "text / plain" -> "text/plain"
970 */
971 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
972 struct strbuf *charset)
973 {
974 const char *p;
975
976 strbuf_reset(type);
977 strbuf_grow(type, raw->len);
978 for (p = raw->buf; *p; p++) {
979 if (isspace(*p))
980 continue;
981 if (*p == ';') {
982 p++;
983 break;
984 }
985 strbuf_addch(type, tolower(*p));
986 }
987
988 if (!charset)
989 return;
990
991 strbuf_reset(charset);
992 while (*p) {
993 while (isspace(*p) || *p == ';')
994 p++;
995 if (!extract_param(p, "charset", charset))
996 return;
997 while (*p && !isspace(*p))
998 p++;
999 }
1000
1001 if (!charset->len && starts_with(type->buf, "text/"))
1002 strbuf_addstr(charset, "ISO-8859-1");
1003 }
1004
1005
1006 /*
1007 * Guess the user's preferred languages from the value in LANGUAGE environment
1008 * variable and LC_MESSAGES locale category if NO_GETTEXT is not defined.
1009 *
1010 * The result can be a colon-separated list like "ko:ja:en".
1011 */
1012 static const char *get_preferred_languages(void)
1013 {
1014 const char *retval;
1015
1016 retval = getenv("LANGUAGE");
1017 if (retval && *retval)
1018 return retval;
1019
1020 #ifndef NO_GETTEXT
1021 retval = setlocale(LC_MESSAGES, NULL);
1022 if (retval && *retval &&
1023 strcmp(retval, "C") &&
1024 strcmp(retval, "POSIX"))
1025 return retval;
1026 #endif
1027
1028 return NULL;
1029 }
1030
1031 static void write_accept_language(struct strbuf *buf)
1032 {
1033 /*
1034 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1035 * that, q-value will be smaller than 0.001, the minimum q-value the
1036 * HTTP specification allows. See
1037 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1038 */
1039 const int MAX_DECIMAL_PLACES = 3;
1040 const int MAX_LANGUAGE_TAGS = 1000;
1041 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1042 char **language_tags = NULL;
1043 int num_langs = 0;
1044 const char *s = get_preferred_languages();
1045 int i;
1046 struct strbuf tag = STRBUF_INIT;
1047
1048 /* Don't add Accept-Language header if no language is preferred. */
1049 if (!s)
1050 return;
1051
1052 /*
1053 * Split the colon-separated string of preferred languages into
1054 * language_tags array.
1055 */
1056 do {
1057 /* collect language tag */
1058 for (; *s && (isalnum(*s) || *s == '_'); s++)
1059 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1060
1061 /* skip .codeset, @modifier and any other unnecessary parts */
1062 while (*s && *s != ':')
1063 s++;
1064
1065 if (tag.len) {
1066 num_langs++;
1067 REALLOC_ARRAY(language_tags, num_langs);
1068 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1069 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1070 break;
1071 }
1072 } while (*s++);
1073
1074 /* write Accept-Language header into buf */
1075 if (num_langs) {
1076 int last_buf_len = 0;
1077 int max_q;
1078 int decimal_places;
1079 char q_format[32];
1080
1081 /* add '*' */
1082 REALLOC_ARRAY(language_tags, num_langs + 1);
1083 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1084
1085 /* compute decimal_places */
1086 for (max_q = 1, decimal_places = 0;
1087 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1088 decimal_places++, max_q *= 10)
1089 ;
1090
1091 sprintf(q_format, ";q=0.%%0%dd", decimal_places);
1092
1093 strbuf_addstr(buf, "Accept-Language: ");
1094
1095 for (i = 0; i < num_langs; i++) {
1096 if (i > 0)
1097 strbuf_addstr(buf, ", ");
1098
1099 strbuf_addstr(buf, language_tags[i]);
1100
1101 if (i > 0)
1102 strbuf_addf(buf, q_format, max_q - i);
1103
1104 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1105 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1106 break;
1107 }
1108
1109 last_buf_len = buf->len;
1110 }
1111 }
1112
1113 /* free language tags -- last one is a static '*' */
1114 for (i = 0; i < num_langs - 1; i++)
1115 free(language_tags[i]);
1116 free(language_tags);
1117 }
1118
1119 /*
1120 * Get an Accept-Language header which indicates user's preferred languages.
1121 *
1122 * Examples:
1123 * LANGUAGE= -> ""
1124 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1125 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1126 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1127 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1128 * LANGUAGE= LANG=C -> ""
1129 */
1130 static const char *get_accept_language(void)
1131 {
1132 if (!cached_accept_language) {
1133 struct strbuf buf = STRBUF_INIT;
1134 write_accept_language(&buf);
1135 if (buf.len > 0)
1136 cached_accept_language = strbuf_detach(&buf, NULL);
1137 }
1138
1139 return cached_accept_language;
1140 }
1141
1142 /* http_request() targets */
1143 #define HTTP_REQUEST_STRBUF 0
1144 #define HTTP_REQUEST_FILE 1
1145
1146 static int http_request(const char *url,
1147 void *result, int target,
1148 const struct http_get_options *options)
1149 {
1150 struct active_request_slot *slot;
1151 struct slot_results results;
1152 struct curl_slist *headers = NULL;
1153 struct strbuf buf = STRBUF_INIT;
1154 const char *accept_language;
1155 int ret;
1156
1157 slot = get_active_slot();
1158 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1159
1160 if (result == NULL) {
1161 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1162 } else {
1163 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1164 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1165
1166 if (target == HTTP_REQUEST_FILE) {
1167 long posn = ftell(result);
1168 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1169 fwrite);
1170 if (posn > 0) {
1171 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1172 headers = curl_slist_append(headers, buf.buf);
1173 strbuf_reset(&buf);
1174 }
1175 } else
1176 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1177 fwrite_buffer);
1178 }
1179
1180 accept_language = get_accept_language();
1181
1182 if (accept_language)
1183 headers = curl_slist_append(headers, accept_language);
1184
1185 strbuf_addstr(&buf, "Pragma:");
1186 if (options && options->no_cache)
1187 strbuf_addstr(&buf, " no-cache");
1188 if (options && options->keep_error)
1189 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1190
1191 headers = curl_slist_append(headers, buf.buf);
1192
1193 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1194 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1195 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1196
1197 ret = run_one_slot(slot, &results);
1198
1199 if (options && options->content_type) {
1200 struct strbuf raw = STRBUF_INIT;
1201 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1202 extract_content_type(&raw, options->content_type,
1203 options->charset);
1204 strbuf_release(&raw);
1205 }
1206
1207 if (options && options->effective_url)
1208 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1209 options->effective_url);
1210
1211 curl_slist_free_all(headers);
1212 strbuf_release(&buf);
1213
1214 return ret;
1215 }
1216
1217 /*
1218 * Update the "base" url to a more appropriate value, as deduced by
1219 * redirects seen when requesting a URL starting with "url".
1220 *
1221 * The "asked" parameter is a URL that we asked curl to access, and must begin
1222 * with "base".
1223 *
1224 * The "got" parameter is the URL that curl reported to us as where we ended
1225 * up.
1226 *
1227 * Returns 1 if we updated the base url, 0 otherwise.
1228 *
1229 * Our basic strategy is to compare "base" and "asked" to find the bits
1230 * specific to our request. We then strip those bits off of "got" to yield the
1231 * new base. So for example, if our base is "http://example.com/foo.git",
1232 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1233 * with "https://other.example.com/foo.git/info/refs". We would want the
1234 * new URL to become "https://other.example.com/foo.git".
1235 *
1236 * Note that this assumes a sane redirect scheme. It's entirely possible
1237 * in the example above to end up at a URL that does not even end in
1238 * "info/refs". In such a case we simply punt, as there is not much we can
1239 * do (and such a scheme is unlikely to represent a real git repository,
1240 * which means we are likely about to abort anyway).
1241 */
1242 static int update_url_from_redirect(struct strbuf *base,
1243 const char *asked,
1244 const struct strbuf *got)
1245 {
1246 const char *tail;
1247 size_t tail_len;
1248
1249 if (!strcmp(asked, got->buf))
1250 return 0;
1251
1252 if (!skip_prefix(asked, base->buf, &tail))
1253 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1254 asked, base->buf);
1255
1256 tail_len = strlen(tail);
1257
1258 if (got->len < tail_len ||
1259 strcmp(tail, got->buf + got->len - tail_len))
1260 return 0; /* insane redirect scheme */
1261
1262 strbuf_reset(base);
1263 strbuf_add(base, got->buf, got->len - tail_len);
1264 return 1;
1265 }
1266
1267 static int http_request_reauth(const char *url,
1268 void *result, int target,
1269 struct http_get_options *options)
1270 {
1271 int ret = http_request(url, result, target, options);
1272
1273 if (options && options->effective_url && options->base_url) {
1274 if (update_url_from_redirect(options->base_url,
1275 url, options->effective_url)) {
1276 credential_from_url(&http_auth, options->base_url->buf);
1277 url = options->effective_url->buf;
1278 }
1279 }
1280
1281 if (ret != HTTP_REAUTH)
1282 return ret;
1283
1284 /*
1285 * If we are using KEEP_ERROR, the previous request may have
1286 * put cruft into our output stream; we should clear it out before
1287 * making our next request. We only know how to do this for
1288 * the strbuf case, but that is enough to satisfy current callers.
1289 */
1290 if (options && options->keep_error) {
1291 switch (target) {
1292 case HTTP_REQUEST_STRBUF:
1293 strbuf_reset(result);
1294 break;
1295 default:
1296 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1297 }
1298 }
1299
1300 credential_fill(&http_auth);
1301
1302 return http_request(url, result, target, options);
1303 }
1304
1305 int http_get_strbuf(const char *url,
1306 struct strbuf *result,
1307 struct http_get_options *options)
1308 {
1309 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1310 }
1311
1312 /*
1313 * Downloads a URL and stores the result in the given file.
1314 *
1315 * If a previous interrupted download is detected (i.e. a previous temporary
1316 * file is still around) the download is resumed.
1317 */
1318 static int http_get_file(const char *url, const char *filename,
1319 struct http_get_options *options)
1320 {
1321 int ret;
1322 struct strbuf tmpfile = STRBUF_INIT;
1323 FILE *result;
1324
1325 strbuf_addf(&tmpfile, "%s.temp", filename);
1326 result = fopen(tmpfile.buf, "a");
1327 if (!result) {
1328 error("Unable to open local file %s", tmpfile.buf);
1329 ret = HTTP_ERROR;
1330 goto cleanup;
1331 }
1332
1333 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1334 fclose(result);
1335
1336 if (ret == HTTP_OK && move_temp_to_file(tmpfile.buf, filename))
1337 ret = HTTP_ERROR;
1338 cleanup:
1339 strbuf_release(&tmpfile);
1340 return ret;
1341 }
1342
1343 int http_fetch_ref(const char *base, struct ref *ref)
1344 {
1345 struct http_get_options options = {0};
1346 char *url;
1347 struct strbuf buffer = STRBUF_INIT;
1348 int ret = -1;
1349
1350 options.no_cache = 1;
1351
1352 url = quote_ref_url(base, ref->name);
1353 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1354 strbuf_rtrim(&buffer);
1355 if (buffer.len == 40)
1356 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1357 else if (starts_with(buffer.buf, "ref: ")) {
1358 ref->symref = xstrdup(buffer.buf + 5);
1359 ret = 0;
1360 }
1361 }
1362
1363 strbuf_release(&buffer);
1364 free(url);
1365 return ret;
1366 }
1367
1368 /* Helpers for fetching packs */
1369 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1370 {
1371 char *url, *tmp;
1372 struct strbuf buf = STRBUF_INIT;
1373
1374 if (http_is_verbose)
1375 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1376
1377 end_url_with_slash(&buf, base_url);
1378 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1379 url = strbuf_detach(&buf, NULL);
1380
1381 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1382 tmp = strbuf_detach(&buf, NULL);
1383
1384 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1385 error("Unable to get pack index %s", url);
1386 free(tmp);
1387 tmp = NULL;
1388 }
1389
1390 free(url);
1391 return tmp;
1392 }
1393
1394 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1395 unsigned char *sha1, const char *base_url)
1396 {
1397 struct packed_git *new_pack;
1398 char *tmp_idx = NULL;
1399 int ret;
1400
1401 if (has_pack_index(sha1)) {
1402 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1403 if (!new_pack)
1404 return -1; /* parse_pack_index() already issued error message */
1405 goto add_pack;
1406 }
1407
1408 tmp_idx = fetch_pack_index(sha1, base_url);
1409 if (!tmp_idx)
1410 return -1;
1411
1412 new_pack = parse_pack_index(sha1, tmp_idx);
1413 if (!new_pack) {
1414 unlink(tmp_idx);
1415 free(tmp_idx);
1416
1417 return -1; /* parse_pack_index() already issued error message */
1418 }
1419
1420 ret = verify_pack_index(new_pack);
1421 if (!ret) {
1422 close_pack_index(new_pack);
1423 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1424 }
1425 free(tmp_idx);
1426 if (ret)
1427 return -1;
1428
1429 add_pack:
1430 new_pack->next = *packs_head;
1431 *packs_head = new_pack;
1432 return 0;
1433 }
1434
1435 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1436 {
1437 struct http_get_options options = {0};
1438 int ret = 0, i = 0;
1439 char *url, *data;
1440 struct strbuf buf = STRBUF_INIT;
1441 unsigned char sha1[20];
1442
1443 end_url_with_slash(&buf, base_url);
1444 strbuf_addstr(&buf, "objects/info/packs");
1445 url = strbuf_detach(&buf, NULL);
1446
1447 options.no_cache = 1;
1448 ret = http_get_strbuf(url, &buf, &options);
1449 if (ret != HTTP_OK)
1450 goto cleanup;
1451
1452 data = buf.buf;
1453 while (i < buf.len) {
1454 switch (data[i]) {
1455 case 'P':
1456 i++;
1457 if (i + 52 <= buf.len &&
1458 starts_with(data + i, " pack-") &&
1459 starts_with(data + i + 46, ".pack\n")) {
1460 get_sha1_hex(data + i + 6, sha1);
1461 fetch_and_setup_pack_index(packs_head, sha1,
1462 base_url);
1463 i += 51;
1464 break;
1465 }
1466 default:
1467 while (i < buf.len && data[i] != '\n')
1468 i++;
1469 }
1470 i++;
1471 }
1472
1473 cleanup:
1474 free(url);
1475 return ret;
1476 }
1477
1478 void release_http_pack_request(struct http_pack_request *preq)
1479 {
1480 if (preq->packfile != NULL) {
1481 fclose(preq->packfile);
1482 preq->packfile = NULL;
1483 }
1484 if (preq->range_header != NULL) {
1485 curl_slist_free_all(preq->range_header);
1486 preq->range_header = NULL;
1487 }
1488 preq->slot = NULL;
1489 free(preq->url);
1490 }
1491
1492 int finish_http_pack_request(struct http_pack_request *preq)
1493 {
1494 struct packed_git **lst;
1495 struct packed_git *p = preq->target;
1496 char *tmp_idx;
1497 struct child_process ip = CHILD_PROCESS_INIT;
1498 const char *ip_argv[8];
1499
1500 close_pack_index(p);
1501
1502 fclose(preq->packfile);
1503 preq->packfile = NULL;
1504
1505 lst = preq->lst;
1506 while (*lst != p)
1507 lst = &((*lst)->next);
1508 *lst = (*lst)->next;
1509
1510 tmp_idx = xstrdup(preq->tmpfile);
1511 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1512 ".idx.temp");
1513
1514 ip_argv[0] = "index-pack";
1515 ip_argv[1] = "-o";
1516 ip_argv[2] = tmp_idx;
1517 ip_argv[3] = preq->tmpfile;
1518 ip_argv[4] = NULL;
1519
1520 ip.argv = ip_argv;
1521 ip.git_cmd = 1;
1522 ip.no_stdin = 1;
1523 ip.no_stdout = 1;
1524
1525 if (run_command(&ip)) {
1526 unlink(preq->tmpfile);
1527 unlink(tmp_idx);
1528 free(tmp_idx);
1529 return -1;
1530 }
1531
1532 unlink(sha1_pack_index_name(p->sha1));
1533
1534 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1535 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1536 free(tmp_idx);
1537 return -1;
1538 }
1539
1540 install_packed_git(p);
1541 free(tmp_idx);
1542 return 0;
1543 }
1544
1545 struct http_pack_request *new_http_pack_request(
1546 struct packed_git *target, const char *base_url)
1547 {
1548 long prev_posn = 0;
1549 char range[RANGE_HEADER_SIZE];
1550 struct strbuf buf = STRBUF_INIT;
1551 struct http_pack_request *preq;
1552
1553 preq = xcalloc(1, sizeof(*preq));
1554 preq->target = target;
1555
1556 end_url_with_slash(&buf, base_url);
1557 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1558 sha1_to_hex(target->sha1));
1559 preq->url = strbuf_detach(&buf, NULL);
1560
1561 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1562 sha1_pack_name(target->sha1));
1563 preq->packfile = fopen(preq->tmpfile, "a");
1564 if (!preq->packfile) {
1565 error("Unable to open local file %s for pack",
1566 preq->tmpfile);
1567 goto abort;
1568 }
1569
1570 preq->slot = get_active_slot();
1571 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1572 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1573 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1574 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1575 no_pragma_header);
1576
1577 /*
1578 * If there is data present from a previous transfer attempt,
1579 * resume where it left off
1580 */
1581 prev_posn = ftell(preq->packfile);
1582 if (prev_posn>0) {
1583 if (http_is_verbose)
1584 fprintf(stderr,
1585 "Resuming fetch of pack %s at byte %ld\n",
1586 sha1_to_hex(target->sha1), prev_posn);
1587 sprintf(range, "Range: bytes=%ld-", prev_posn);
1588 preq->range_header = curl_slist_append(NULL, range);
1589 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1590 preq->range_header);
1591 }
1592
1593 return preq;
1594
1595 abort:
1596 free(preq->url);
1597 free(preq);
1598 return NULL;
1599 }
1600
1601 /* Helpers for fetching objects (loose) */
1602 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1603 void *data)
1604 {
1605 unsigned char expn[4096];
1606 size_t size = eltsize * nmemb;
1607 int posn = 0;
1608 struct http_object_request *freq =
1609 (struct http_object_request *)data;
1610 do {
1611 ssize_t retval = xwrite(freq->localfile,
1612 (char *) ptr + posn, size - posn);
1613 if (retval < 0)
1614 return posn;
1615 posn += retval;
1616 } while (posn < size);
1617
1618 freq->stream.avail_in = size;
1619 freq->stream.next_in = (void *)ptr;
1620 do {
1621 freq->stream.next_out = expn;
1622 freq->stream.avail_out = sizeof(expn);
1623 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1624 git_SHA1_Update(&freq->c, expn,
1625 sizeof(expn) - freq->stream.avail_out);
1626 } while (freq->stream.avail_in && freq->zret == Z_OK);
1627 return size;
1628 }
1629
1630 struct http_object_request *new_http_object_request(const char *base_url,
1631 unsigned char *sha1)
1632 {
1633 char *hex = sha1_to_hex(sha1);
1634 const char *filename;
1635 char prevfile[PATH_MAX];
1636 int prevlocal;
1637 char prev_buf[PREV_BUF_SIZE];
1638 ssize_t prev_read = 0;
1639 long prev_posn = 0;
1640 char range[RANGE_HEADER_SIZE];
1641 struct curl_slist *range_header = NULL;
1642 struct http_object_request *freq;
1643
1644 freq = xcalloc(1, sizeof(*freq));
1645 hashcpy(freq->sha1, sha1);
1646 freq->localfile = -1;
1647
1648 filename = sha1_file_name(sha1);
1649 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1650 "%s.temp", filename);
1651
1652 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1653 unlink_or_warn(prevfile);
1654 rename(freq->tmpfile, prevfile);
1655 unlink_or_warn(freq->tmpfile);
1656
1657 if (freq->localfile != -1)
1658 error("fd leakage in start: %d", freq->localfile);
1659 freq->localfile = open(freq->tmpfile,
1660 O_WRONLY | O_CREAT | O_EXCL, 0666);
1661 /*
1662 * This could have failed due to the "lazy directory creation";
1663 * try to mkdir the last path component.
1664 */
1665 if (freq->localfile < 0 && errno == ENOENT) {
1666 char *dir = strrchr(freq->tmpfile, '/');
1667 if (dir) {
1668 *dir = 0;
1669 mkdir(freq->tmpfile, 0777);
1670 *dir = '/';
1671 }
1672 freq->localfile = open(freq->tmpfile,
1673 O_WRONLY | O_CREAT | O_EXCL, 0666);
1674 }
1675
1676 if (freq->localfile < 0) {
1677 error("Couldn't create temporary file %s: %s",
1678 freq->tmpfile, strerror(errno));
1679 goto abort;
1680 }
1681
1682 git_inflate_init(&freq->stream);
1683
1684 git_SHA1_Init(&freq->c);
1685
1686 freq->url = get_remote_object_url(base_url, hex, 0);
1687
1688 /*
1689 * If a previous temp file is present, process what was already
1690 * fetched.
1691 */
1692 prevlocal = open(prevfile, O_RDONLY);
1693 if (prevlocal != -1) {
1694 do {
1695 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1696 if (prev_read>0) {
1697 if (fwrite_sha1_file(prev_buf,
1698 1,
1699 prev_read,
1700 freq) == prev_read) {
1701 prev_posn += prev_read;
1702 } else {
1703 prev_read = -1;
1704 }
1705 }
1706 } while (prev_read > 0);
1707 close(prevlocal);
1708 }
1709 unlink_or_warn(prevfile);
1710
1711 /*
1712 * Reset inflate/SHA1 if there was an error reading the previous temp
1713 * file; also rewind to the beginning of the local file.
1714 */
1715 if (prev_read == -1) {
1716 memset(&freq->stream, 0, sizeof(freq->stream));
1717 git_inflate_init(&freq->stream);
1718 git_SHA1_Init(&freq->c);
1719 if (prev_posn>0) {
1720 prev_posn = 0;
1721 lseek(freq->localfile, 0, SEEK_SET);
1722 if (ftruncate(freq->localfile, 0) < 0) {
1723 error("Couldn't truncate temporary file %s: %s",
1724 freq->tmpfile, strerror(errno));
1725 goto abort;
1726 }
1727 }
1728 }
1729
1730 freq->slot = get_active_slot();
1731
1732 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1733 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1734 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1735 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1736 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1737
1738 /*
1739 * If we have successfully processed data from a previous fetch
1740 * attempt, only fetch the data we don't already have.
1741 */
1742 if (prev_posn>0) {
1743 if (http_is_verbose)
1744 fprintf(stderr,
1745 "Resuming fetch of object %s at byte %ld\n",
1746 hex, prev_posn);
1747 sprintf(range, "Range: bytes=%ld-", prev_posn);
1748 range_header = curl_slist_append(range_header, range);
1749 curl_easy_setopt(freq->slot->curl,
1750 CURLOPT_HTTPHEADER, range_header);
1751 }
1752
1753 return freq;
1754
1755 abort:
1756 free(freq->url);
1757 free(freq);
1758 return NULL;
1759 }
1760
1761 void process_http_object_request(struct http_object_request *freq)
1762 {
1763 if (freq->slot == NULL)
1764 return;
1765 freq->curl_result = freq->slot->curl_result;
1766 freq->http_code = freq->slot->http_code;
1767 freq->slot = NULL;
1768 }
1769
1770 int finish_http_object_request(struct http_object_request *freq)
1771 {
1772 struct stat st;
1773
1774 close(freq->localfile);
1775 freq->localfile = -1;
1776
1777 process_http_object_request(freq);
1778
1779 if (freq->http_code == 416) {
1780 warning("requested range invalid; we may already have all the data.");
1781 } else if (freq->curl_result != CURLE_OK) {
1782 if (stat(freq->tmpfile, &st) == 0)
1783 if (st.st_size == 0)
1784 unlink_or_warn(freq->tmpfile);
1785 return -1;
1786 }
1787
1788 git_inflate_end(&freq->stream);
1789 git_SHA1_Final(freq->real_sha1, &freq->c);
1790 if (freq->zret != Z_STREAM_END) {
1791 unlink_or_warn(freq->tmpfile);
1792 return -1;
1793 }
1794 if (hashcmp(freq->sha1, freq->real_sha1)) {
1795 unlink_or_warn(freq->tmpfile);
1796 return -1;
1797 }
1798 freq->rename =
1799 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1800
1801 return freq->rename;
1802 }
1803
1804 void abort_http_object_request(struct http_object_request *freq)
1805 {
1806 unlink_or_warn(freq->tmpfile);
1807
1808 release_http_object_request(freq);
1809 }
1810
1811 void release_http_object_request(struct http_object_request *freq)
1812 {
1813 if (freq->localfile != -1) {
1814 close(freq->localfile);
1815 freq->localfile = -1;
1816 }
1817 if (freq->url != NULL) {
1818 free(freq->url);
1819 freq->url = NULL;
1820 }
1821 if (freq->slot != NULL) {
1822 freq->slot->callback_func = NULL;
1823 freq->slot->callback_data = NULL;
1824 release_active_slot(freq->slot);
1825 freq->slot = NULL;
1826 }
1827 }
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