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git-checkout.txt: document "git checkout <pathspec>" better
[git/debian.git] / http.c
blob4b179f6fc8f29c1683b187393203d20f95d29157
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 #include "gettext.h"
12
13 int active_requests;
14 int http_is_verbose;
15 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
16
17 #if LIBCURL_VERSION_NUM >= 0x070a06
18 #define LIBCURL_CAN_HANDLE_AUTH_ANY
19 #endif
20
21 static int min_curl_sessions = 1;
22 static int curl_session_count;
23 #ifdef USE_CURL_MULTI
24 static int max_requests = -1;
25 static CURLM *curlm;
26 #endif
27 #ifndef NO_CURL_EASY_DUPHANDLE
28 static CURL *curl_default;
29 #endif
30
31 #define PREV_BUF_SIZE 4096
32 #define RANGE_HEADER_SIZE 30
33
34 char curl_errorstr[CURL_ERROR_SIZE];
35
36 static int curl_ssl_verify = -1;
37 static int curl_ssl_try;
38 static const char *ssl_cert;
39 #if LIBCURL_VERSION_NUM >= 0x070903
40 static const char *ssl_key;
41 #endif
42 #if LIBCURL_VERSION_NUM >= 0x070908
43 static const char *ssl_capath;
44 #endif
45 static const char *ssl_cainfo;
46 static long curl_low_speed_limit = -1;
47 static long curl_low_speed_time = -1;
48 static int curl_ftp_no_epsv;
49 static const char *curl_http_proxy;
50 static const char *curl_cookie_file;
51 static int curl_save_cookies;
52 struct credential http_auth = CREDENTIAL_INIT;
53 static int http_proactive_auth;
54 static const char *user_agent;
55
56 #if LIBCURL_VERSION_NUM >= 0x071700
57 /* Use CURLOPT_KEYPASSWD as is */
58 #elif LIBCURL_VERSION_NUM >= 0x070903
59 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
60 #else
61 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
62 #endif
63
64 static struct credential cert_auth = CREDENTIAL_INIT;
65 static int ssl_cert_password_required;
66 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
67 static unsigned long http_auth_methods = CURLAUTH_ANY;
68 #endif
69
70 static struct curl_slist *pragma_header;
71 static struct curl_slist *no_pragma_header;
72
73 static struct active_request_slot *active_queue_head;
74
75 static char *cached_accept_language;
76
77 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
78 {
79 size_t size = eltsize * nmemb;
80 struct buffer *buffer = buffer_;
81
82 if (size > buffer->buf.len - buffer->posn)
83 size = buffer->buf.len - buffer->posn;
84 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
85 buffer->posn += size;
86
87 return size;
88 }
89
90 #ifndef NO_CURL_IOCTL
91 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
92 {
93 struct buffer *buffer = clientp;
94
95 switch (cmd) {
96 case CURLIOCMD_NOP:
97 return CURLIOE_OK;
98
99 case CURLIOCMD_RESTARTREAD:
100 buffer->posn = 0;
101 return CURLIOE_OK;
102
103 default:
104 return CURLIOE_UNKNOWNCMD;
105 }
106 }
107 #endif
108
109 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
110 {
111 size_t size = eltsize * nmemb;
112 struct strbuf *buffer = buffer_;
113
114 strbuf_add(buffer, ptr, size);
115 return size;
116 }
117
118 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
119 {
120 return eltsize * nmemb;
121 }
122
123 static void closedown_active_slot(struct active_request_slot *slot)
124 {
125 active_requests--;
126 slot->in_use = 0;
127 }
128
129 static void finish_active_slot(struct active_request_slot *slot)
130 {
131 closedown_active_slot(slot);
132 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
133
134 if (slot->finished != NULL)
135 (*slot->finished) = 1;
136
137 /* Store slot results so they can be read after the slot is reused */
138 if (slot->results != NULL) {
139 slot->results->curl_result = slot->curl_result;
140 slot->results->http_code = slot->http_code;
141 #if LIBCURL_VERSION_NUM >= 0x070a08
142 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
143 &slot->results->auth_avail);
144 #else
145 slot->results->auth_avail = 0;
146 #endif
147 }
148
149 /* Run callback if appropriate */
150 if (slot->callback_func != NULL)
151 slot->callback_func(slot->callback_data);
152 }
153
154 #ifdef USE_CURL_MULTI
155 static void process_curl_messages(void)
156 {
157 int num_messages;
158 struct active_request_slot *slot;
159 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
160
161 while (curl_message != NULL) {
162 if (curl_message->msg == CURLMSG_DONE) {
163 int curl_result = curl_message->data.result;
164 slot = active_queue_head;
165 while (slot != NULL &&
166 slot->curl != curl_message->easy_handle)
167 slot = slot->next;
168 if (slot != NULL) {
169 curl_multi_remove_handle(curlm, slot->curl);
170 slot->curl_result = curl_result;
171 finish_active_slot(slot);
172 } else {
173 fprintf(stderr, "Received DONE message for unknown request!\n");
174 }
175 } else {
176 fprintf(stderr, "Unknown CURL message received: %d\n",
177 (int)curl_message->msg);
178 }
179 curl_message = curl_multi_info_read(curlm, &num_messages);
180 }
181 }
182 #endif
183
184 static int http_options(const char *var, const char *value, void *cb)
185 {
186 if (!strcmp("http.sslverify", var)) {
187 curl_ssl_verify = git_config_bool(var, value);
188 return 0;
189 }
190 if (!strcmp("http.sslcert", var))
191 return git_config_string(&ssl_cert, var, value);
192 #if LIBCURL_VERSION_NUM >= 0x070903
193 if (!strcmp("http.sslkey", var))
194 return git_config_string(&ssl_key, var, value);
195 #endif
196 #if LIBCURL_VERSION_NUM >= 0x070908
197 if (!strcmp("http.sslcapath", var))
198 return git_config_string(&ssl_capath, var, value);
199 #endif
200 if (!strcmp("http.sslcainfo", var))
201 return git_config_string(&ssl_cainfo, var, value);
202 if (!strcmp("http.sslcertpasswordprotected", var)) {
203 ssl_cert_password_required = git_config_bool(var, value);
204 return 0;
205 }
206 if (!strcmp("http.ssltry", var)) {
207 curl_ssl_try = git_config_bool(var, value);
208 return 0;
209 }
210 if (!strcmp("http.minsessions", var)) {
211 min_curl_sessions = git_config_int(var, value);
212 #ifndef USE_CURL_MULTI
213 if (min_curl_sessions > 1)
214 min_curl_sessions = 1;
215 #endif
216 return 0;
217 }
218 #ifdef USE_CURL_MULTI
219 if (!strcmp("http.maxrequests", var)) {
220 max_requests = git_config_int(var, value);
221 return 0;
222 }
223 #endif
224 if (!strcmp("http.lowspeedlimit", var)) {
225 curl_low_speed_limit = (long)git_config_int(var, value);
226 return 0;
227 }
228 if (!strcmp("http.lowspeedtime", var)) {
229 curl_low_speed_time = (long)git_config_int(var, value);
230 return 0;
231 }
232
233 if (!strcmp("http.noepsv", var)) {
234 curl_ftp_no_epsv = git_config_bool(var, value);
235 return 0;
236 }
237 if (!strcmp("http.proxy", var))
238 return git_config_string(&curl_http_proxy, var, value);
239
240 if (!strcmp("http.cookiefile", var))
241 return git_config_string(&curl_cookie_file, var, value);
242 if (!strcmp("http.savecookies", var)) {
243 curl_save_cookies = git_config_bool(var, value);
244 return 0;
245 }
246
247 if (!strcmp("http.postbuffer", var)) {
248 http_post_buffer = git_config_int(var, value);
249 if (http_post_buffer < LARGE_PACKET_MAX)
250 http_post_buffer = LARGE_PACKET_MAX;
251 return 0;
252 }
253
254 if (!strcmp("http.useragent", var))
255 return git_config_string(&user_agent, var, value);
256
257 /* Fall back on the default ones */
258 return git_default_config(var, value, cb);
259 }
260
261 static void init_curl_http_auth(CURL *result)
262 {
263 if (!http_auth.username)
264 return;
265
266 credential_fill(&http_auth);
267
268 #if LIBCURL_VERSION_NUM >= 0x071301
269 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
270 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
271 #else
272 {
273 static struct strbuf up = STRBUF_INIT;
274 /*
275 * Note that we assume we only ever have a single set of
276 * credentials in a given program run, so we do not have
277 * to worry about updating this buffer, only setting its
278 * initial value.
279 */
280 if (!up.len)
281 strbuf_addf(&up, "%s:%s",
282 http_auth.username, http_auth.password);
283 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
284 }
285 #endif
286 }
287
288 static int has_cert_password(void)
289 {
290 if (ssl_cert == NULL || ssl_cert_password_required != 1)
291 return 0;
292 if (!cert_auth.password) {
293 cert_auth.protocol = xstrdup("cert");
294 cert_auth.username = xstrdup("");
295 cert_auth.path = xstrdup(ssl_cert);
296 credential_fill(&cert_auth);
297 }
298 return 1;
299 }
300
301 #if LIBCURL_VERSION_NUM >= 0x071900
302 static void set_curl_keepalive(CURL *c)
303 {
304 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
305 }
306
307 #elif LIBCURL_VERSION_NUM >= 0x071000
308 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
309 {
310 int ka = 1;
311 int rc;
312 socklen_t len = (socklen_t)sizeof(ka);
313
314 if (type != CURLSOCKTYPE_IPCXN)
315 return 0;
316
317 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
318 if (rc < 0)
319 warning("unable to set SO_KEEPALIVE on socket %s",
320 strerror(errno));
321
322 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
323 }
324
325 static void set_curl_keepalive(CURL *c)
326 {
327 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
328 }
329
330 #else
331 static void set_curl_keepalive(CURL *c)
332 {
333 /* not supported on older curl versions */
334 }
335 #endif
336
337 static CURL *get_curl_handle(void)
338 {
339 CURL *result = curl_easy_init();
340
341 if (!result)
342 die("curl_easy_init failed");
343
344 if (!curl_ssl_verify) {
345 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
346 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
347 } else {
348 /* Verify authenticity of the peer's certificate */
349 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
350 /* The name in the cert must match whom we tried to connect */
351 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
352 }
353
354 #if LIBCURL_VERSION_NUM >= 0x070907
355 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
356 #endif
357 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
358 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
359 #endif
360
361 if (http_proactive_auth)
362 init_curl_http_auth(result);
363
364 if (ssl_cert != NULL)
365 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
366 if (has_cert_password())
367 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
368 #if LIBCURL_VERSION_NUM >= 0x070903
369 if (ssl_key != NULL)
370 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
371 #endif
372 #if LIBCURL_VERSION_NUM >= 0x070908
373 if (ssl_capath != NULL)
374 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
375 #endif
376 if (ssl_cainfo != NULL)
377 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
378
379 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
380 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
381 curl_low_speed_limit);
382 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
383 curl_low_speed_time);
384 }
385
386 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
387 #if LIBCURL_VERSION_NUM >= 0x071301
388 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
389 #elif LIBCURL_VERSION_NUM >= 0x071101
390 curl_easy_setopt(result, CURLOPT_POST301, 1);
391 #endif
392
393 if (getenv("GIT_CURL_VERBOSE"))
394 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
395
396 curl_easy_setopt(result, CURLOPT_USERAGENT,
397 user_agent ? user_agent : git_user_agent());
398
399 if (curl_ftp_no_epsv)
400 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
401
402 #ifdef CURLOPT_USE_SSL
403 if (curl_ssl_try)
404 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
405 #endif
406
407 if (curl_http_proxy) {
408 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
409 #if LIBCURL_VERSION_NUM >= 0x070a07
410 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
411 #endif
412 }
413
414 set_curl_keepalive(result);
415
416 return result;
417 }
418
419 static void set_from_env(const char **var, const char *envname)
420 {
421 const char *val = getenv(envname);
422 if (val)
423 *var = val;
424 }
425
426 void http_init(struct remote *remote, const char *url, int proactive_auth)
427 {
428 char *low_speed_limit;
429 char *low_speed_time;
430 char *normalized_url;
431 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
432
433 config.section = "http";
434 config.key = NULL;
435 config.collect_fn = http_options;
436 config.cascade_fn = git_default_config;
437 config.cb = NULL;
438
439 http_is_verbose = 0;
440 normalized_url = url_normalize(url, &config.url);
441
442 git_config(urlmatch_config_entry, &config);
443 free(normalized_url);
444
445 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
446 die("curl_global_init failed");
447
448 http_proactive_auth = proactive_auth;
449
450 if (remote && remote->http_proxy)
451 curl_http_proxy = xstrdup(remote->http_proxy);
452
453 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
454 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
455
456 #ifdef USE_CURL_MULTI
457 {
458 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
459 if (http_max_requests != NULL)
460 max_requests = atoi(http_max_requests);
461 }
462
463 curlm = curl_multi_init();
464 if (!curlm)
465 die("curl_multi_init failed");
466 #endif
467
468 if (getenv("GIT_SSL_NO_VERIFY"))
469 curl_ssl_verify = 0;
470
471 set_from_env(&ssl_cert, "GIT_SSL_CERT");
472 #if LIBCURL_VERSION_NUM >= 0x070903
473 set_from_env(&ssl_key, "GIT_SSL_KEY");
474 #endif
475 #if LIBCURL_VERSION_NUM >= 0x070908
476 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
477 #endif
478 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
479
480 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
481
482 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
483 if (low_speed_limit != NULL)
484 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
485 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
486 if (low_speed_time != NULL)
487 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
488
489 if (curl_ssl_verify == -1)
490 curl_ssl_verify = 1;
491
492 curl_session_count = 0;
493 #ifdef USE_CURL_MULTI
494 if (max_requests < 1)
495 max_requests = DEFAULT_MAX_REQUESTS;
496 #endif
497
498 if (getenv("GIT_CURL_FTP_NO_EPSV"))
499 curl_ftp_no_epsv = 1;
500
501 if (url) {
502 credential_from_url(&http_auth, url);
503 if (!ssl_cert_password_required &&
504 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
505 starts_with(url, "https://"))
506 ssl_cert_password_required = 1;
507 }
508
509 #ifndef NO_CURL_EASY_DUPHANDLE
510 curl_default = get_curl_handle();
511 #endif
512 }
513
514 void http_cleanup(void)
515 {
516 struct active_request_slot *slot = active_queue_head;
517
518 while (slot != NULL) {
519 struct active_request_slot *next = slot->next;
520 if (slot->curl != NULL) {
521 #ifdef USE_CURL_MULTI
522 curl_multi_remove_handle(curlm, slot->curl);
523 #endif
524 curl_easy_cleanup(slot->curl);
525 }
526 free(slot);
527 slot = next;
528 }
529 active_queue_head = NULL;
530
531 #ifndef NO_CURL_EASY_DUPHANDLE
532 curl_easy_cleanup(curl_default);
533 #endif
534
535 #ifdef USE_CURL_MULTI
536 curl_multi_cleanup(curlm);
537 #endif
538 curl_global_cleanup();
539
540 curl_slist_free_all(pragma_header);
541 pragma_header = NULL;
542
543 curl_slist_free_all(no_pragma_header);
544 no_pragma_header = NULL;
545
546 if (curl_http_proxy) {
547 free((void *)curl_http_proxy);
548 curl_http_proxy = NULL;
549 }
550
551 if (cert_auth.password != NULL) {
552 memset(cert_auth.password, 0, strlen(cert_auth.password));
553 free(cert_auth.password);
554 cert_auth.password = NULL;
555 }
556 ssl_cert_password_required = 0;
557
558 free(cached_accept_language);
559 cached_accept_language = NULL;
560 }
561
562 struct active_request_slot *get_active_slot(void)
563 {
564 struct active_request_slot *slot = active_queue_head;
565 struct active_request_slot *newslot;
566
567 #ifdef USE_CURL_MULTI
568 int num_transfers;
569
570 /* Wait for a slot to open up if the queue is full */
571 while (active_requests >= max_requests) {
572 curl_multi_perform(curlm, &num_transfers);
573 if (num_transfers < active_requests)
574 process_curl_messages();
575 }
576 #endif
577
578 while (slot != NULL && slot->in_use)
579 slot = slot->next;
580
581 if (slot == NULL) {
582 newslot = xmalloc(sizeof(*newslot));
583 newslot->curl = NULL;
584 newslot->in_use = 0;
585 newslot->next = NULL;
586
587 slot = active_queue_head;
588 if (slot == NULL) {
589 active_queue_head = newslot;
590 } else {
591 while (slot->next != NULL)
592 slot = slot->next;
593 slot->next = newslot;
594 }
595 slot = newslot;
596 }
597
598 if (slot->curl == NULL) {
599 #ifdef NO_CURL_EASY_DUPHANDLE
600 slot->curl = get_curl_handle();
601 #else
602 slot->curl = curl_easy_duphandle(curl_default);
603 #endif
604 curl_session_count++;
605 }
606
607 active_requests++;
608 slot->in_use = 1;
609 slot->results = NULL;
610 slot->finished = NULL;
611 slot->callback_data = NULL;
612 slot->callback_func = NULL;
613 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
614 if (curl_save_cookies)
615 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
616 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
617 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
618 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
619 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
620 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
621 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
622 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
623 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
624 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
625 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
626 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
627 #endif
628 if (http_auth.password)
629 init_curl_http_auth(slot->curl);
630
631 return slot;
632 }
633
634 int start_active_slot(struct active_request_slot *slot)
635 {
636 #ifdef USE_CURL_MULTI
637 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
638 int num_transfers;
639
640 if (curlm_result != CURLM_OK &&
641 curlm_result != CURLM_CALL_MULTI_PERFORM) {
642 active_requests--;
643 slot->in_use = 0;
644 return 0;
645 }
646
647 /*
648 * We know there must be something to do, since we just added
649 * something.
650 */
651 curl_multi_perform(curlm, &num_transfers);
652 #endif
653 return 1;
654 }
655
656 #ifdef USE_CURL_MULTI
657 struct fill_chain {
658 void *data;
659 int (*fill)(void *);
660 struct fill_chain *next;
661 };
662
663 static struct fill_chain *fill_cfg;
664
665 void add_fill_function(void *data, int (*fill)(void *))
666 {
667 struct fill_chain *new = xmalloc(sizeof(*new));
668 struct fill_chain **linkp = &fill_cfg;
669 new->data = data;
670 new->fill = fill;
671 new->next = NULL;
672 while (*linkp)
673 linkp = &(*linkp)->next;
674 *linkp = new;
675 }
676
677 void fill_active_slots(void)
678 {
679 struct active_request_slot *slot = active_queue_head;
680
681 while (active_requests < max_requests) {
682 struct fill_chain *fill;
683 for (fill = fill_cfg; fill; fill = fill->next)
684 if (fill->fill(fill->data))
685 break;
686
687 if (!fill)
688 break;
689 }
690
691 while (slot != NULL) {
692 if (!slot->in_use && slot->curl != NULL
693 && curl_session_count > min_curl_sessions) {
694 curl_easy_cleanup(slot->curl);
695 slot->curl = NULL;
696 curl_session_count--;
697 }
698 slot = slot->next;
699 }
700 }
701
702 void step_active_slots(void)
703 {
704 int num_transfers;
705 CURLMcode curlm_result;
706
707 do {
708 curlm_result = curl_multi_perform(curlm, &num_transfers);
709 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
710 if (num_transfers < active_requests) {
711 process_curl_messages();
712 fill_active_slots();
713 }
714 }
715 #endif
716
717 void run_active_slot(struct active_request_slot *slot)
718 {
719 #ifdef USE_CURL_MULTI
720 fd_set readfds;
721 fd_set writefds;
722 fd_set excfds;
723 int max_fd;
724 struct timeval select_timeout;
725 int finished = 0;
726
727 slot->finished = &finished;
728 while (!finished) {
729 step_active_slots();
730
731 if (slot->in_use) {
732 #if LIBCURL_VERSION_NUM >= 0x070f04
733 long curl_timeout;
734 curl_multi_timeout(curlm, &curl_timeout);
735 if (curl_timeout == 0) {
736 continue;
737 } else if (curl_timeout == -1) {
738 select_timeout.tv_sec = 0;
739 select_timeout.tv_usec = 50000;
740 } else {
741 select_timeout.tv_sec = curl_timeout / 1000;
742 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
743 }
744 #else
745 select_timeout.tv_sec = 0;
746 select_timeout.tv_usec = 50000;
747 #endif
748
749 max_fd = -1;
750 FD_ZERO(&readfds);
751 FD_ZERO(&writefds);
752 FD_ZERO(&excfds);
753 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
754
755 /*
756 * It can happen that curl_multi_timeout returns a pathologically
757 * long timeout when curl_multi_fdset returns no file descriptors
758 * to read. See commit message for more details.
759 */
760 if (max_fd < 0 &&
761 (select_timeout.tv_sec > 0 ||
762 select_timeout.tv_usec > 50000)) {
763 select_timeout.tv_sec = 0;
764 select_timeout.tv_usec = 50000;
765 }
766
767 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
768 }
769 }
770 #else
771 while (slot->in_use) {
772 slot->curl_result = curl_easy_perform(slot->curl);
773 finish_active_slot(slot);
774 }
775 #endif
776 }
777
778 static void release_active_slot(struct active_request_slot *slot)
779 {
780 closedown_active_slot(slot);
781 if (slot->curl && curl_session_count > min_curl_sessions) {
782 #ifdef USE_CURL_MULTI
783 curl_multi_remove_handle(curlm, slot->curl);
784 #endif
785 curl_easy_cleanup(slot->curl);
786 slot->curl = NULL;
787 curl_session_count--;
788 }
789 #ifdef USE_CURL_MULTI
790 fill_active_slots();
791 #endif
792 }
793
794 void finish_all_active_slots(void)
795 {
796 struct active_request_slot *slot = active_queue_head;
797
798 while (slot != NULL)
799 if (slot->in_use) {
800 run_active_slot(slot);
801 slot = active_queue_head;
802 } else {
803 slot = slot->next;
804 }
805 }
806
807 /* Helpers for modifying and creating URLs */
808 static inline int needs_quote(int ch)
809 {
810 if (((ch >= 'A') && (ch <= 'Z'))
811 || ((ch >= 'a') && (ch <= 'z'))
812 || ((ch >= '0') && (ch <= '9'))
813 || (ch == '/')
814 || (ch == '-')
815 || (ch == '.'))
816 return 0;
817 return 1;
818 }
819
820 static char *quote_ref_url(const char *base, const char *ref)
821 {
822 struct strbuf buf = STRBUF_INIT;
823 const char *cp;
824 int ch;
825
826 end_url_with_slash(&buf, base);
827
828 for (cp = ref; (ch = *cp) != 0; cp++)
829 if (needs_quote(ch))
830 strbuf_addf(&buf, "%%%02x", ch);
831 else
832 strbuf_addch(&buf, *cp);
833
834 return strbuf_detach(&buf, NULL);
835 }
836
837 void append_remote_object_url(struct strbuf *buf, const char *url,
838 const char *hex,
839 int only_two_digit_prefix)
840 {
841 end_url_with_slash(buf, url);
842
843 strbuf_addf(buf, "objects/%.*s/", 2, hex);
844 if (!only_two_digit_prefix)
845 strbuf_addf(buf, "%s", hex+2);
846 }
847
848 char *get_remote_object_url(const char *url, const char *hex,
849 int only_two_digit_prefix)
850 {
851 struct strbuf buf = STRBUF_INIT;
852 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
853 return strbuf_detach(&buf, NULL);
854 }
855
856 static int handle_curl_result(struct slot_results *results)
857 {
858 /*
859 * If we see a failing http code with CURLE_OK, we have turned off
860 * FAILONERROR (to keep the server's custom error response), and should
861 * translate the code into failure here.
862 */
863 if (results->curl_result == CURLE_OK &&
864 results->http_code >= 400) {
865 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
866 /*
867 * Normally curl will already have put the "reason phrase"
868 * from the server into curl_errorstr; unfortunately without
869 * FAILONERROR it is lost, so we can give only the numeric
870 * status code.
871 */
872 snprintf(curl_errorstr, sizeof(curl_errorstr),
873 "The requested URL returned error: %ld",
874 results->http_code);
875 }
876
877 if (results->curl_result == CURLE_OK) {
878 credential_approve(&http_auth);
879 return HTTP_OK;
880 } else if (missing_target(results))
881 return HTTP_MISSING_TARGET;
882 else if (results->http_code == 401) {
883 if (http_auth.username && http_auth.password) {
884 credential_reject(&http_auth);
885 return HTTP_NOAUTH;
886 } else {
887 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
888 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
889 #endif
890 return HTTP_REAUTH;
891 }
892 } else {
893 #if LIBCURL_VERSION_NUM >= 0x070c00
894 if (!curl_errorstr[0])
895 strlcpy(curl_errorstr,
896 curl_easy_strerror(results->curl_result),
897 sizeof(curl_errorstr));
898 #endif
899 return HTTP_ERROR;
900 }
901 }
902
903 int run_one_slot(struct active_request_slot *slot,
904 struct slot_results *results)
905 {
906 slot->results = results;
907 if (!start_active_slot(slot)) {
908 snprintf(curl_errorstr, sizeof(curl_errorstr),
909 "failed to start HTTP request");
910 return HTTP_START_FAILED;
911 }
912
913 run_active_slot(slot);
914 return handle_curl_result(results);
915 }
916
917 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
918 {
919 char *ptr;
920 CURLcode ret;
921
922 strbuf_reset(buf);
923 ret = curl_easy_getinfo(curl, info, &ptr);
924 if (!ret && ptr)
925 strbuf_addstr(buf, ptr);
926 return ret;
927 }
928
929 /*
930 * Check for and extract a content-type parameter. "raw"
931 * should be positioned at the start of the potential
932 * parameter, with any whitespace already removed.
933 *
934 * "name" is the name of the parameter. The value is appended
935 * to "out".
936 */
937 static int extract_param(const char *raw, const char *name,
938 struct strbuf *out)
939 {
940 size_t len = strlen(name);
941
942 if (strncasecmp(raw, name, len))
943 return -1;
944 raw += len;
945
946 if (*raw != '=')
947 return -1;
948 raw++;
949
950 while (*raw && !isspace(*raw) && *raw != ';')
951 strbuf_addch(out, *raw++);
952 return 0;
953 }
954
955 /*
956 * Extract a normalized version of the content type, with any
957 * spaces suppressed, all letters lowercased, and no trailing ";"
958 * or parameters.
959 *
960 * Note that we will silently remove even invalid whitespace. For
961 * example, "text / plain" is specifically forbidden by RFC 2616,
962 * but "text/plain" is the only reasonable output, and this keeps
963 * our code simple.
964 *
965 * If the "charset" argument is not NULL, store the value of any
966 * charset parameter there.
967 *
968 * Example:
969 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
970 * "text / plain" -> "text/plain"
971 */
972 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
973 struct strbuf *charset)
974 {
975 const char *p;
976
977 strbuf_reset(type);
978 strbuf_grow(type, raw->len);
979 for (p = raw->buf; *p; p++) {
980 if (isspace(*p))
981 continue;
982 if (*p == ';') {
983 p++;
984 break;
985 }
986 strbuf_addch(type, tolower(*p));
987 }
988
989 if (!charset)
990 return;
991
992 strbuf_reset(charset);
993 while (*p) {
994 while (isspace(*p) || *p == ';')
995 p++;
996 if (!extract_param(p, "charset", charset))
997 return;
998 while (*p && !isspace(*p))
999 p++;
1000 }
1001
1002 if (!charset->len && starts_with(type->buf, "text/"))
1003 strbuf_addstr(charset, "ISO-8859-1");
1004 }
1005
1006 static void write_accept_language(struct strbuf *buf)
1007 {
1008 /*
1009 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1010 * that, q-value will be smaller than 0.001, the minimum q-value the
1011 * HTTP specification allows. See
1012 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1013 */
1014 const int MAX_DECIMAL_PLACES = 3;
1015 const int MAX_LANGUAGE_TAGS = 1000;
1016 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1017 char **language_tags = NULL;
1018 int num_langs = 0;
1019 const char *s = get_preferred_languages();
1020 int i;
1021 struct strbuf tag = STRBUF_INIT;
1022
1023 /* Don't add Accept-Language header if no language is preferred. */
1024 if (!s)
1025 return;
1026
1027 /*
1028 * Split the colon-separated string of preferred languages into
1029 * language_tags array.
1030 */
1031 do {
1032 /* collect language tag */
1033 for (; *s && (isalnum(*s) || *s == '_'); s++)
1034 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1035
1036 /* skip .codeset, @modifier and any other unnecessary parts */
1037 while (*s && *s != ':')
1038 s++;
1039
1040 if (tag.len) {
1041 num_langs++;
1042 REALLOC_ARRAY(language_tags, num_langs);
1043 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1044 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1045 break;
1046 }
1047 } while (*s++);
1048
1049 /* write Accept-Language header into buf */
1050 if (num_langs) {
1051 int last_buf_len = 0;
1052 int max_q;
1053 int decimal_places;
1054 char q_format[32];
1055
1056 /* add '*' */
1057 REALLOC_ARRAY(language_tags, num_langs + 1);
1058 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1059
1060 /* compute decimal_places */
1061 for (max_q = 1, decimal_places = 0;
1062 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1063 decimal_places++, max_q *= 10)
1064 ;
1065
1066 sprintf(q_format, ";q=0.%%0%dd", decimal_places);
1067
1068 strbuf_addstr(buf, "Accept-Language: ");
1069
1070 for (i = 0; i < num_langs; i++) {
1071 if (i > 0)
1072 strbuf_addstr(buf, ", ");
1073
1074 strbuf_addstr(buf, language_tags[i]);
1075
1076 if (i > 0)
1077 strbuf_addf(buf, q_format, max_q - i);
1078
1079 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1080 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1081 break;
1082 }
1083
1084 last_buf_len = buf->len;
1085 }
1086 }
1087
1088 /* free language tags -- last one is a static '*' */
1089 for (i = 0; i < num_langs - 1; i++)
1090 free(language_tags[i]);
1091 free(language_tags);
1092 }
1093
1094 /*
1095 * Get an Accept-Language header which indicates user's preferred languages.
1096 *
1097 * Examples:
1098 * LANGUAGE= -> ""
1099 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1100 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1101 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1102 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1103 * LANGUAGE= LANG=C -> ""
1104 */
1105 static const char *get_accept_language(void)
1106 {
1107 if (!cached_accept_language) {
1108 struct strbuf buf = STRBUF_INIT;
1109 write_accept_language(&buf);
1110 if (buf.len > 0)
1111 cached_accept_language = strbuf_detach(&buf, NULL);
1112 }
1113
1114 return cached_accept_language;
1115 }
1116
1117 /* http_request() targets */
1118 #define HTTP_REQUEST_STRBUF 0
1119 #define HTTP_REQUEST_FILE 1
1120
1121 static int http_request(const char *url,
1122 void *result, int target,
1123 const struct http_get_options *options)
1124 {
1125 struct active_request_slot *slot;
1126 struct slot_results results;
1127 struct curl_slist *headers = NULL;
1128 struct strbuf buf = STRBUF_INIT;
1129 const char *accept_language;
1130 int ret;
1131
1132 slot = get_active_slot();
1133 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1134
1135 if (result == NULL) {
1136 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1137 } else {
1138 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1139 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1140
1141 if (target == HTTP_REQUEST_FILE) {
1142 long posn = ftell(result);
1143 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1144 fwrite);
1145 if (posn > 0) {
1146 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1147 headers = curl_slist_append(headers, buf.buf);
1148 strbuf_reset(&buf);
1149 }
1150 } else
1151 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1152 fwrite_buffer);
1153 }
1154
1155 accept_language = get_accept_language();
1156
1157 if (accept_language)
1158 headers = curl_slist_append(headers, accept_language);
1159
1160 strbuf_addstr(&buf, "Pragma:");
1161 if (options && options->no_cache)
1162 strbuf_addstr(&buf, " no-cache");
1163 if (options && options->keep_error)
1164 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1165
1166 headers = curl_slist_append(headers, buf.buf);
1167
1168 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1169 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1170 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1171
1172 ret = run_one_slot(slot, &results);
1173
1174 if (options && options->content_type) {
1175 struct strbuf raw = STRBUF_INIT;
1176 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1177 extract_content_type(&raw, options->content_type,
1178 options->charset);
1179 strbuf_release(&raw);
1180 }
1181
1182 if (options && options->effective_url)
1183 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1184 options->effective_url);
1185
1186 curl_slist_free_all(headers);
1187 strbuf_release(&buf);
1188
1189 return ret;
1190 }
1191
1192 /*
1193 * Update the "base" url to a more appropriate value, as deduced by
1194 * redirects seen when requesting a URL starting with "url".
1195 *
1196 * The "asked" parameter is a URL that we asked curl to access, and must begin
1197 * with "base".
1198 *
1199 * The "got" parameter is the URL that curl reported to us as where we ended
1200 * up.
1201 *
1202 * Returns 1 if we updated the base url, 0 otherwise.
1203 *
1204 * Our basic strategy is to compare "base" and "asked" to find the bits
1205 * specific to our request. We then strip those bits off of "got" to yield the
1206 * new base. So for example, if our base is "http://example.com/foo.git",
1207 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1208 * with "https://other.example.com/foo.git/info/refs". We would want the
1209 * new URL to become "https://other.example.com/foo.git".
1210 *
1211 * Note that this assumes a sane redirect scheme. It's entirely possible
1212 * in the example above to end up at a URL that does not even end in
1213 * "info/refs". In such a case we simply punt, as there is not much we can
1214 * do (and such a scheme is unlikely to represent a real git repository,
1215 * which means we are likely about to abort anyway).
1216 */
1217 static int update_url_from_redirect(struct strbuf *base,
1218 const char *asked,
1219 const struct strbuf *got)
1220 {
1221 const char *tail;
1222 size_t tail_len;
1223
1224 if (!strcmp(asked, got->buf))
1225 return 0;
1226
1227 if (!skip_prefix(asked, base->buf, &tail))
1228 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1229 asked, base->buf);
1230
1231 tail_len = strlen(tail);
1232
1233 if (got->len < tail_len ||
1234 strcmp(tail, got->buf + got->len - tail_len))
1235 return 0; /* insane redirect scheme */
1236
1237 strbuf_reset(base);
1238 strbuf_add(base, got->buf, got->len - tail_len);
1239 return 1;
1240 }
1241
1242 static int http_request_reauth(const char *url,
1243 void *result, int target,
1244 struct http_get_options *options)
1245 {
1246 int ret = http_request(url, result, target, options);
1247
1248 if (options && options->effective_url && options->base_url) {
1249 if (update_url_from_redirect(options->base_url,
1250 url, options->effective_url)) {
1251 credential_from_url(&http_auth, options->base_url->buf);
1252 url = options->effective_url->buf;
1253 }
1254 }
1255
1256 if (ret != HTTP_REAUTH)
1257 return ret;
1258
1259 /*
1260 * If we are using KEEP_ERROR, the previous request may have
1261 * put cruft into our output stream; we should clear it out before
1262 * making our next request. We only know how to do this for
1263 * the strbuf case, but that is enough to satisfy current callers.
1264 */
1265 if (options && options->keep_error) {
1266 switch (target) {
1267 case HTTP_REQUEST_STRBUF:
1268 strbuf_reset(result);
1269 break;
1270 default:
1271 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1272 }
1273 }
1274
1275 credential_fill(&http_auth);
1276
1277 return http_request(url, result, target, options);
1278 }
1279
1280 int http_get_strbuf(const char *url,
1281 struct strbuf *result,
1282 struct http_get_options *options)
1283 {
1284 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1285 }
1286
1287 /*
1288 * Downloads a URL and stores the result in the given file.
1289 *
1290 * If a previous interrupted download is detected (i.e. a previous temporary
1291 * file is still around) the download is resumed.
1292 */
1293 static int http_get_file(const char *url, const char *filename,
1294 struct http_get_options *options)
1295 {
1296 int ret;
1297 struct strbuf tmpfile = STRBUF_INIT;
1298 FILE *result;
1299
1300 strbuf_addf(&tmpfile, "%s.temp", filename);
1301 result = fopen(tmpfile.buf, "a");
1302 if (!result) {
1303 error("Unable to open local file %s", tmpfile.buf);
1304 ret = HTTP_ERROR;
1305 goto cleanup;
1306 }
1307
1308 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1309 fclose(result);
1310
1311 if (ret == HTTP_OK && move_temp_to_file(tmpfile.buf, filename))
1312 ret = HTTP_ERROR;
1313 cleanup:
1314 strbuf_release(&tmpfile);
1315 return ret;
1316 }
1317
1318 int http_fetch_ref(const char *base, struct ref *ref)
1319 {
1320 struct http_get_options options = {0};
1321 char *url;
1322 struct strbuf buffer = STRBUF_INIT;
1323 int ret = -1;
1324
1325 options.no_cache = 1;
1326
1327 url = quote_ref_url(base, ref->name);
1328 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1329 strbuf_rtrim(&buffer);
1330 if (buffer.len == 40)
1331 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1332 else if (starts_with(buffer.buf, "ref: ")) {
1333 ref->symref = xstrdup(buffer.buf + 5);
1334 ret = 0;
1335 }
1336 }
1337
1338 strbuf_release(&buffer);
1339 free(url);
1340 return ret;
1341 }
1342
1343 /* Helpers for fetching packs */
1344 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1345 {
1346 char *url, *tmp;
1347 struct strbuf buf = STRBUF_INIT;
1348
1349 if (http_is_verbose)
1350 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1351
1352 end_url_with_slash(&buf, base_url);
1353 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1354 url = strbuf_detach(&buf, NULL);
1355
1356 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1357 tmp = strbuf_detach(&buf, NULL);
1358
1359 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1360 error("Unable to get pack index %s", url);
1361 free(tmp);
1362 tmp = NULL;
1363 }
1364
1365 free(url);
1366 return tmp;
1367 }
1368
1369 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1370 unsigned char *sha1, const char *base_url)
1371 {
1372 struct packed_git *new_pack;
1373 char *tmp_idx = NULL;
1374 int ret;
1375
1376 if (has_pack_index(sha1)) {
1377 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1378 if (!new_pack)
1379 return -1; /* parse_pack_index() already issued error message */
1380 goto add_pack;
1381 }
1382
1383 tmp_idx = fetch_pack_index(sha1, base_url);
1384 if (!tmp_idx)
1385 return -1;
1386
1387 new_pack = parse_pack_index(sha1, tmp_idx);
1388 if (!new_pack) {
1389 unlink(tmp_idx);
1390 free(tmp_idx);
1391
1392 return -1; /* parse_pack_index() already issued error message */
1393 }
1394
1395 ret = verify_pack_index(new_pack);
1396 if (!ret) {
1397 close_pack_index(new_pack);
1398 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1399 }
1400 free(tmp_idx);
1401 if (ret)
1402 return -1;
1403
1404 add_pack:
1405 new_pack->next = *packs_head;
1406 *packs_head = new_pack;
1407 return 0;
1408 }
1409
1410 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1411 {
1412 struct http_get_options options = {0};
1413 int ret = 0, i = 0;
1414 char *url, *data;
1415 struct strbuf buf = STRBUF_INIT;
1416 unsigned char sha1[20];
1417
1418 end_url_with_slash(&buf, base_url);
1419 strbuf_addstr(&buf, "objects/info/packs");
1420 url = strbuf_detach(&buf, NULL);
1421
1422 options.no_cache = 1;
1423 ret = http_get_strbuf(url, &buf, &options);
1424 if (ret != HTTP_OK)
1425 goto cleanup;
1426
1427 data = buf.buf;
1428 while (i < buf.len) {
1429 switch (data[i]) {
1430 case 'P':
1431 i++;
1432 if (i + 52 <= buf.len &&
1433 starts_with(data + i, " pack-") &&
1434 starts_with(data + i + 46, ".pack\n")) {
1435 get_sha1_hex(data + i + 6, sha1);
1436 fetch_and_setup_pack_index(packs_head, sha1,
1437 base_url);
1438 i += 51;
1439 break;
1440 }
1441 default:
1442 while (i < buf.len && data[i] != '\n')
1443 i++;
1444 }
1445 i++;
1446 }
1447
1448 cleanup:
1449 free(url);
1450 return ret;
1451 }
1452
1453 void release_http_pack_request(struct http_pack_request *preq)
1454 {
1455 if (preq->packfile != NULL) {
1456 fclose(preq->packfile);
1457 preq->packfile = NULL;
1458 }
1459 if (preq->range_header != NULL) {
1460 curl_slist_free_all(preq->range_header);
1461 preq->range_header = NULL;
1462 }
1463 preq->slot = NULL;
1464 free(preq->url);
1465 free(preq);
1466 }
1467
1468 int finish_http_pack_request(struct http_pack_request *preq)
1469 {
1470 struct packed_git **lst;
1471 struct packed_git *p = preq->target;
1472 char *tmp_idx;
1473 struct child_process ip = CHILD_PROCESS_INIT;
1474 const char *ip_argv[8];
1475
1476 close_pack_index(p);
1477
1478 fclose(preq->packfile);
1479 preq->packfile = NULL;
1480
1481 lst = preq->lst;
1482 while (*lst != p)
1483 lst = &((*lst)->next);
1484 *lst = (*lst)->next;
1485
1486 tmp_idx = xstrdup(preq->tmpfile);
1487 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1488 ".idx.temp");
1489
1490 ip_argv[0] = "index-pack";
1491 ip_argv[1] = "-o";
1492 ip_argv[2] = tmp_idx;
1493 ip_argv[3] = preq->tmpfile;
1494 ip_argv[4] = NULL;
1495
1496 ip.argv = ip_argv;
1497 ip.git_cmd = 1;
1498 ip.no_stdin = 1;
1499 ip.no_stdout = 1;
1500
1501 if (run_command(&ip)) {
1502 unlink(preq->tmpfile);
1503 unlink(tmp_idx);
1504 free(tmp_idx);
1505 return -1;
1506 }
1507
1508 unlink(sha1_pack_index_name(p->sha1));
1509
1510 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1511 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1512 free(tmp_idx);
1513 return -1;
1514 }
1515
1516 install_packed_git(p);
1517 free(tmp_idx);
1518 return 0;
1519 }
1520
1521 struct http_pack_request *new_http_pack_request(
1522 struct packed_git *target, const char *base_url)
1523 {
1524 long prev_posn = 0;
1525 char range[RANGE_HEADER_SIZE];
1526 struct strbuf buf = STRBUF_INIT;
1527 struct http_pack_request *preq;
1528
1529 preq = xcalloc(1, sizeof(*preq));
1530 preq->target = target;
1531
1532 end_url_with_slash(&buf, base_url);
1533 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1534 sha1_to_hex(target->sha1));
1535 preq->url = strbuf_detach(&buf, NULL);
1536
1537 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1538 sha1_pack_name(target->sha1));
1539 preq->packfile = fopen(preq->tmpfile, "a");
1540 if (!preq->packfile) {
1541 error("Unable to open local file %s for pack",
1542 preq->tmpfile);
1543 goto abort;
1544 }
1545
1546 preq->slot = get_active_slot();
1547 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1548 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1549 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1550 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1551 no_pragma_header);
1552
1553 /*
1554 * If there is data present from a previous transfer attempt,
1555 * resume where it left off
1556 */
1557 prev_posn = ftell(preq->packfile);
1558 if (prev_posn>0) {
1559 if (http_is_verbose)
1560 fprintf(stderr,
1561 "Resuming fetch of pack %s at byte %ld\n",
1562 sha1_to_hex(target->sha1), prev_posn);
1563 sprintf(range, "Range: bytes=%ld-", prev_posn);
1564 preq->range_header = curl_slist_append(NULL, range);
1565 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1566 preq->range_header);
1567 }
1568
1569 return preq;
1570
1571 abort:
1572 free(preq->url);
1573 free(preq);
1574 return NULL;
1575 }
1576
1577 /* Helpers for fetching objects (loose) */
1578 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1579 void *data)
1580 {
1581 unsigned char expn[4096];
1582 size_t size = eltsize * nmemb;
1583 int posn = 0;
1584 struct http_object_request *freq =
1585 (struct http_object_request *)data;
1586 do {
1587 ssize_t retval = xwrite(freq->localfile,
1588 (char *) ptr + posn, size - posn);
1589 if (retval < 0)
1590 return posn;
1591 posn += retval;
1592 } while (posn < size);
1593
1594 freq->stream.avail_in = size;
1595 freq->stream.next_in = (void *)ptr;
1596 do {
1597 freq->stream.next_out = expn;
1598 freq->stream.avail_out = sizeof(expn);
1599 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1600 git_SHA1_Update(&freq->c, expn,
1601 sizeof(expn) - freq->stream.avail_out);
1602 } while (freq->stream.avail_in && freq->zret == Z_OK);
1603 return size;
1604 }
1605
1606 struct http_object_request *new_http_object_request(const char *base_url,
1607 unsigned char *sha1)
1608 {
1609 char *hex = sha1_to_hex(sha1);
1610 const char *filename;
1611 char prevfile[PATH_MAX];
1612 int prevlocal;
1613 char prev_buf[PREV_BUF_SIZE];
1614 ssize_t prev_read = 0;
1615 long prev_posn = 0;
1616 char range[RANGE_HEADER_SIZE];
1617 struct curl_slist *range_header = NULL;
1618 struct http_object_request *freq;
1619
1620 freq = xcalloc(1, sizeof(*freq));
1621 hashcpy(freq->sha1, sha1);
1622 freq->localfile = -1;
1623
1624 filename = sha1_file_name(sha1);
1625 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1626 "%s.temp", filename);
1627
1628 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1629 unlink_or_warn(prevfile);
1630 rename(freq->tmpfile, prevfile);
1631 unlink_or_warn(freq->tmpfile);
1632
1633 if (freq->localfile != -1)
1634 error("fd leakage in start: %d", freq->localfile);
1635 freq->localfile = open(freq->tmpfile,
1636 O_WRONLY | O_CREAT | O_EXCL, 0666);
1637 /*
1638 * This could have failed due to the "lazy directory creation";
1639 * try to mkdir the last path component.
1640 */
1641 if (freq->localfile < 0 && errno == ENOENT) {
1642 char *dir = strrchr(freq->tmpfile, '/');
1643 if (dir) {
1644 *dir = 0;
1645 mkdir(freq->tmpfile, 0777);
1646 *dir = '/';
1647 }
1648 freq->localfile = open(freq->tmpfile,
1649 O_WRONLY | O_CREAT | O_EXCL, 0666);
1650 }
1651
1652 if (freq->localfile < 0) {
1653 error("Couldn't create temporary file %s: %s",
1654 freq->tmpfile, strerror(errno));
1655 goto abort;
1656 }
1657
1658 git_inflate_init(&freq->stream);
1659
1660 git_SHA1_Init(&freq->c);
1661
1662 freq->url = get_remote_object_url(base_url, hex, 0);
1663
1664 /*
1665 * If a previous temp file is present, process what was already
1666 * fetched.
1667 */
1668 prevlocal = open(prevfile, O_RDONLY);
1669 if (prevlocal != -1) {
1670 do {
1671 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1672 if (prev_read>0) {
1673 if (fwrite_sha1_file(prev_buf,
1674 1,
1675 prev_read,
1676 freq) == prev_read) {
1677 prev_posn += prev_read;
1678 } else {
1679 prev_read = -1;
1680 }
1681 }
1682 } while (prev_read > 0);
1683 close(prevlocal);
1684 }
1685 unlink_or_warn(prevfile);
1686
1687 /*
1688 * Reset inflate/SHA1 if there was an error reading the previous temp
1689 * file; also rewind to the beginning of the local file.
1690 */
1691 if (prev_read == -1) {
1692 memset(&freq->stream, 0, sizeof(freq->stream));
1693 git_inflate_init(&freq->stream);
1694 git_SHA1_Init(&freq->c);
1695 if (prev_posn>0) {
1696 prev_posn = 0;
1697 lseek(freq->localfile, 0, SEEK_SET);
1698 if (ftruncate(freq->localfile, 0) < 0) {
1699 error("Couldn't truncate temporary file %s: %s",
1700 freq->tmpfile, strerror(errno));
1701 goto abort;
1702 }
1703 }
1704 }
1705
1706 freq->slot = get_active_slot();
1707
1708 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1709 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1710 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1711 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1712 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1713
1714 /*
1715 * If we have successfully processed data from a previous fetch
1716 * attempt, only fetch the data we don't already have.
1717 */
1718 if (prev_posn>0) {
1719 if (http_is_verbose)
1720 fprintf(stderr,
1721 "Resuming fetch of object %s at byte %ld\n",
1722 hex, prev_posn);
1723 sprintf(range, "Range: bytes=%ld-", prev_posn);
1724 range_header = curl_slist_append(range_header, range);
1725 curl_easy_setopt(freq->slot->curl,
1726 CURLOPT_HTTPHEADER, range_header);
1727 }
1728
1729 return freq;
1730
1731 abort:
1732 free(freq->url);
1733 free(freq);
1734 return NULL;
1735 }
1736
1737 void process_http_object_request(struct http_object_request *freq)
1738 {
1739 if (freq->slot == NULL)
1740 return;
1741 freq->curl_result = freq->slot->curl_result;
1742 freq->http_code = freq->slot->http_code;
1743 freq->slot = NULL;
1744 }
1745
1746 int finish_http_object_request(struct http_object_request *freq)
1747 {
1748 struct stat st;
1749
1750 close(freq->localfile);
1751 freq->localfile = -1;
1752
1753 process_http_object_request(freq);
1754
1755 if (freq->http_code == 416) {
1756 warning("requested range invalid; we may already have all the data.");
1757 } else if (freq->curl_result != CURLE_OK) {
1758 if (stat(freq->tmpfile, &st) == 0)
1759 if (st.st_size == 0)
1760 unlink_or_warn(freq->tmpfile);
1761 return -1;
1762 }
1763
1764 git_inflate_end(&freq->stream);
1765 git_SHA1_Final(freq->real_sha1, &freq->c);
1766 if (freq->zret != Z_STREAM_END) {
1767 unlink_or_warn(freq->tmpfile);
1768 return -1;
1769 }
1770 if (hashcmp(freq->sha1, freq->real_sha1)) {
1771 unlink_or_warn(freq->tmpfile);
1772 return -1;
1773 }
1774 freq->rename =
1775 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1776
1777 return freq->rename;
1778 }
1779
1780 void abort_http_object_request(struct http_object_request *freq)
1781 {
1782 unlink_or_warn(freq->tmpfile);
1783
1784 release_http_object_request(freq);
1785 }
1786
1787 void release_http_object_request(struct http_object_request *freq)
1788 {
1789 if (freq->localfile != -1) {
1790 close(freq->localfile);
1791 freq->localfile = -1;
1792 }
1793 if (freq->url != NULL) {
1794 free(freq->url);
1795 freq->url = NULL;
1796 }
1797 if (freq->slot != NULL) {
1798 freq->slot->callback_func = NULL;
1799 freq->slot->callback_data = NULL;
1800 release_active_slot(freq->slot);
1801 freq->slot = NULL;
1802 }
1803 }
git for Debian