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cleanups: ensure that git-compat-util.h is included first
[git.git] / http.c
blobc0663cd41f3406c8b43ae562a575b2bd5c283801
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
66 static struct curl_slist *pragma_header;
67 static struct curl_slist *no_pragma_header;
68
69 static struct active_request_slot *active_queue_head;
70
71 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
72 {
73 size_t size = eltsize * nmemb;
74 struct buffer *buffer = buffer_;
75
76 if (size > buffer->buf.len - buffer->posn)
77 size = buffer->buf.len - buffer->posn;
78 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
79 buffer->posn += size;
80
81 return size;
82 }
83
84 #ifndef NO_CURL_IOCTL
85 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
86 {
87 struct buffer *buffer = clientp;
88
89 switch (cmd) {
90 case CURLIOCMD_NOP:
91 return CURLIOE_OK;
92
93 case CURLIOCMD_RESTARTREAD:
94 buffer->posn = 0;
95 return CURLIOE_OK;
96
97 default:
98 return CURLIOE_UNKNOWNCMD;
99 }
100 }
101 #endif
102
103 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
104 {
105 size_t size = eltsize * nmemb;
106 struct strbuf *buffer = buffer_;
107
108 strbuf_add(buffer, ptr, size);
109 return size;
110 }
111
112 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
113 {
114 return eltsize * nmemb;
115 }
116
117 #ifdef USE_CURL_MULTI
118 static void process_curl_messages(void)
119 {
120 int num_messages;
121 struct active_request_slot *slot;
122 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
123
124 while (curl_message != NULL) {
125 if (curl_message->msg == CURLMSG_DONE) {
126 int curl_result = curl_message->data.result;
127 slot = active_queue_head;
128 while (slot != NULL &&
129 slot->curl != curl_message->easy_handle)
130 slot = slot->next;
131 if (slot != NULL) {
132 curl_multi_remove_handle(curlm, slot->curl);
133 slot->curl_result = curl_result;
134 finish_active_slot(slot);
135 } else {
136 fprintf(stderr, "Received DONE message for unknown request!\n");
137 }
138 } else {
139 fprintf(stderr, "Unknown CURL message received: %d\n",
140 (int)curl_message->msg);
141 }
142 curl_message = curl_multi_info_read(curlm, &num_messages);
143 }
144 }
145 #endif
146
147 static int http_options(const char *var, const char *value, void *cb)
148 {
149 if (!strcmp("http.sslverify", var)) {
150 curl_ssl_verify = git_config_bool(var, value);
151 return 0;
152 }
153 if (!strcmp("http.sslcert", var))
154 return git_config_string(&ssl_cert, var, value);
155 #if LIBCURL_VERSION_NUM >= 0x070903
156 if (!strcmp("http.sslkey", var))
157 return git_config_string(&ssl_key, var, value);
158 #endif
159 #if LIBCURL_VERSION_NUM >= 0x070908
160 if (!strcmp("http.sslcapath", var))
161 return git_config_string(&ssl_capath, var, value);
162 #endif
163 if (!strcmp("http.sslcainfo", var))
164 return git_config_string(&ssl_cainfo, var, value);
165 if (!strcmp("http.sslcertpasswordprotected", var)) {
166 ssl_cert_password_required = git_config_bool(var, value);
167 return 0;
168 }
169 if (!strcmp("http.ssltry", var)) {
170 curl_ssl_try = git_config_bool(var, value);
171 return 0;
172 }
173 if (!strcmp("http.minsessions", var)) {
174 min_curl_sessions = git_config_int(var, value);
175 #ifndef USE_CURL_MULTI
176 if (min_curl_sessions > 1)
177 min_curl_sessions = 1;
178 #endif
179 return 0;
180 }
181 #ifdef USE_CURL_MULTI
182 if (!strcmp("http.maxrequests", var)) {
183 max_requests = git_config_int(var, value);
184 return 0;
185 }
186 #endif
187 if (!strcmp("http.lowspeedlimit", var)) {
188 curl_low_speed_limit = (long)git_config_int(var, value);
189 return 0;
190 }
191 if (!strcmp("http.lowspeedtime", var)) {
192 curl_low_speed_time = (long)git_config_int(var, value);
193 return 0;
194 }
195
196 if (!strcmp("http.noepsv", var)) {
197 curl_ftp_no_epsv = git_config_bool(var, value);
198 return 0;
199 }
200 if (!strcmp("http.proxy", var))
201 return git_config_string(&curl_http_proxy, var, value);
202
203 if (!strcmp("http.cookiefile", var))
204 return git_config_string(&curl_cookie_file, var, value);
205 if (!strcmp("http.savecookies", var)) {
206 curl_save_cookies = git_config_bool(var, value);
207 return 0;
208 }
209
210 if (!strcmp("http.postbuffer", var)) {
211 http_post_buffer = git_config_int(var, value);
212 if (http_post_buffer < LARGE_PACKET_MAX)
213 http_post_buffer = LARGE_PACKET_MAX;
214 return 0;
215 }
216
217 if (!strcmp("http.useragent", var))
218 return git_config_string(&user_agent, var, value);
219
220 /* Fall back on the default ones */
221 return git_default_config(var, value, cb);
222 }
223
224 static void init_curl_http_auth(CURL *result)
225 {
226 if (!http_auth.username)
227 return;
228
229 credential_fill(&http_auth);
230
231 #if LIBCURL_VERSION_NUM >= 0x071301
232 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
233 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
234 #else
235 {
236 static struct strbuf up = STRBUF_INIT;
237 /*
238 * Note that we assume we only ever have a single set of
239 * credentials in a given program run, so we do not have
240 * to worry about updating this buffer, only setting its
241 * initial value.
242 */
243 if (!up.len)
244 strbuf_addf(&up, "%s:%s",
245 http_auth.username, http_auth.password);
246 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
247 }
248 #endif
249 }
250
251 static int has_cert_password(void)
252 {
253 if (ssl_cert == NULL || ssl_cert_password_required != 1)
254 return 0;
255 if (!cert_auth.password) {
256 cert_auth.protocol = xstrdup("cert");
257 cert_auth.username = xstrdup("");
258 cert_auth.path = xstrdup(ssl_cert);
259 credential_fill(&cert_auth);
260 }
261 return 1;
262 }
263
264 #if LIBCURL_VERSION_NUM >= 0x071900
265 static void set_curl_keepalive(CURL *c)
266 {
267 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
268 }
269
270 #elif LIBCURL_VERSION_NUM >= 0x071000
271 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
272 {
273 int ka = 1;
274 int rc;
275 socklen_t len = (socklen_t)sizeof(ka);
276
277 if (type != CURLSOCKTYPE_IPCXN)
278 return 0;
279
280 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
281 if (rc < 0)
282 warning("unable to set SO_KEEPALIVE on socket %s",
283 strerror(errno));
284
285 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
286 }
287
288 static void set_curl_keepalive(CURL *c)
289 {
290 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
291 }
292
293 #else
294 static void set_curl_keepalive(CURL *c)
295 {
296 /* not supported on older curl versions */
297 }
298 #endif
299
300 static CURL *get_curl_handle(void)
301 {
302 CURL *result = curl_easy_init();
303
304 if (!curl_ssl_verify) {
305 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
306 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
307 } else {
308 /* Verify authenticity of the peer's certificate */
309 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
310 /* The name in the cert must match whom we tried to connect */
311 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
312 }
313
314 #if LIBCURL_VERSION_NUM >= 0x070907
315 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
316 #endif
317 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
318 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
319 #endif
320
321 if (http_proactive_auth)
322 init_curl_http_auth(result);
323
324 if (ssl_cert != NULL)
325 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
326 if (has_cert_password())
327 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
328 #if LIBCURL_VERSION_NUM >= 0x070903
329 if (ssl_key != NULL)
330 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
331 #endif
332 #if LIBCURL_VERSION_NUM >= 0x070908
333 if (ssl_capath != NULL)
334 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
335 #endif
336 if (ssl_cainfo != NULL)
337 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
338
339 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
340 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
341 curl_low_speed_limit);
342 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
343 curl_low_speed_time);
344 }
345
346 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
347 #if LIBCURL_VERSION_NUM >= 0x071301
348 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
349 #elif LIBCURL_VERSION_NUM >= 0x071101
350 curl_easy_setopt(result, CURLOPT_POST301, 1);
351 #endif
352
353 if (getenv("GIT_CURL_VERBOSE"))
354 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
355
356 curl_easy_setopt(result, CURLOPT_USERAGENT,
357 user_agent ? user_agent : git_user_agent());
358
359 if (curl_ftp_no_epsv)
360 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
361
362 #ifdef CURLOPT_USE_SSL
363 if (curl_ssl_try)
364 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
365 #endif
366
367 if (curl_http_proxy) {
368 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
369 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
370 }
371
372 set_curl_keepalive(result);
373
374 return result;
375 }
376
377 static void set_from_env(const char **var, const char *envname)
378 {
379 const char *val = getenv(envname);
380 if (val)
381 *var = val;
382 }
383
384 void http_init(struct remote *remote, const char *url, int proactive_auth)
385 {
386 char *low_speed_limit;
387 char *low_speed_time;
388 char *normalized_url;
389 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
390
391 config.section = "http";
392 config.key = NULL;
393 config.collect_fn = http_options;
394 config.cascade_fn = git_default_config;
395 config.cb = NULL;
396
397 http_is_verbose = 0;
398 normalized_url = url_normalize(url, &config.url);
399
400 git_config(urlmatch_config_entry, &config);
401 free(normalized_url);
402
403 curl_global_init(CURL_GLOBAL_ALL);
404
405 http_proactive_auth = proactive_auth;
406
407 if (remote && remote->http_proxy)
408 curl_http_proxy = xstrdup(remote->http_proxy);
409
410 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
411 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
412
413 #ifdef USE_CURL_MULTI
414 {
415 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
416 if (http_max_requests != NULL)
417 max_requests = atoi(http_max_requests);
418 }
419
420 curlm = curl_multi_init();
421 if (curlm == NULL) {
422 fprintf(stderr, "Error creating curl multi handle.\n");
423 exit(1);
424 }
425 #endif
426
427 if (getenv("GIT_SSL_NO_VERIFY"))
428 curl_ssl_verify = 0;
429
430 set_from_env(&ssl_cert, "GIT_SSL_CERT");
431 #if LIBCURL_VERSION_NUM >= 0x070903
432 set_from_env(&ssl_key, "GIT_SSL_KEY");
433 #endif
434 #if LIBCURL_VERSION_NUM >= 0x070908
435 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
436 #endif
437 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
438
439 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
440
441 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
442 if (low_speed_limit != NULL)
443 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
444 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
445 if (low_speed_time != NULL)
446 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
447
448 if (curl_ssl_verify == -1)
449 curl_ssl_verify = 1;
450
451 curl_session_count = 0;
452 #ifdef USE_CURL_MULTI
453 if (max_requests < 1)
454 max_requests = DEFAULT_MAX_REQUESTS;
455 #endif
456
457 if (getenv("GIT_CURL_FTP_NO_EPSV"))
458 curl_ftp_no_epsv = 1;
459
460 if (url) {
461 credential_from_url(&http_auth, url);
462 if (!ssl_cert_password_required &&
463 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
464 starts_with(url, "https://"))
465 ssl_cert_password_required = 1;
466 }
467
468 #ifndef NO_CURL_EASY_DUPHANDLE
469 curl_default = get_curl_handle();
470 #endif
471 }
472
473 void http_cleanup(void)
474 {
475 struct active_request_slot *slot = active_queue_head;
476
477 while (slot != NULL) {
478 struct active_request_slot *next = slot->next;
479 if (slot->curl != NULL) {
480 #ifdef USE_CURL_MULTI
481 curl_multi_remove_handle(curlm, slot->curl);
482 #endif
483 curl_easy_cleanup(slot->curl);
484 }
485 free(slot);
486 slot = next;
487 }
488 active_queue_head = NULL;
489
490 #ifndef NO_CURL_EASY_DUPHANDLE
491 curl_easy_cleanup(curl_default);
492 #endif
493
494 #ifdef USE_CURL_MULTI
495 curl_multi_cleanup(curlm);
496 #endif
497 curl_global_cleanup();
498
499 curl_slist_free_all(pragma_header);
500 pragma_header = NULL;
501
502 curl_slist_free_all(no_pragma_header);
503 no_pragma_header = NULL;
504
505 if (curl_http_proxy) {
506 free((void *)curl_http_proxy);
507 curl_http_proxy = NULL;
508 }
509
510 if (cert_auth.password != NULL) {
511 memset(cert_auth.password, 0, strlen(cert_auth.password));
512 free(cert_auth.password);
513 cert_auth.password = NULL;
514 }
515 ssl_cert_password_required = 0;
516 }
517
518 struct active_request_slot *get_active_slot(void)
519 {
520 struct active_request_slot *slot = active_queue_head;
521 struct active_request_slot *newslot;
522
523 #ifdef USE_CURL_MULTI
524 int num_transfers;
525
526 /* Wait for a slot to open up if the queue is full */
527 while (active_requests >= max_requests) {
528 curl_multi_perform(curlm, &num_transfers);
529 if (num_transfers < active_requests)
530 process_curl_messages();
531 }
532 #endif
533
534 while (slot != NULL && slot->in_use)
535 slot = slot->next;
536
537 if (slot == NULL) {
538 newslot = xmalloc(sizeof(*newslot));
539 newslot->curl = NULL;
540 newslot->in_use = 0;
541 newslot->next = NULL;
542
543 slot = active_queue_head;
544 if (slot == NULL) {
545 active_queue_head = newslot;
546 } else {
547 while (slot->next != NULL)
548 slot = slot->next;
549 slot->next = newslot;
550 }
551 slot = newslot;
552 }
553
554 if (slot->curl == NULL) {
555 #ifdef NO_CURL_EASY_DUPHANDLE
556 slot->curl = get_curl_handle();
557 #else
558 slot->curl = curl_easy_duphandle(curl_default);
559 #endif
560 curl_session_count++;
561 }
562
563 active_requests++;
564 slot->in_use = 1;
565 slot->results = NULL;
566 slot->finished = NULL;
567 slot->callback_data = NULL;
568 slot->callback_func = NULL;
569 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
570 if (curl_save_cookies)
571 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
572 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
573 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
574 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
575 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
576 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
577 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
578 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
579 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
580 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
581 if (http_auth.password)
582 init_curl_http_auth(slot->curl);
583
584 return slot;
585 }
586
587 int start_active_slot(struct active_request_slot *slot)
588 {
589 #ifdef USE_CURL_MULTI
590 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
591 int num_transfers;
592
593 if (curlm_result != CURLM_OK &&
594 curlm_result != CURLM_CALL_MULTI_PERFORM) {
595 active_requests--;
596 slot->in_use = 0;
597 return 0;
598 }
599
600 /*
601 * We know there must be something to do, since we just added
602 * something.
603 */
604 curl_multi_perform(curlm, &num_transfers);
605 #endif
606 return 1;
607 }
608
609 #ifdef USE_CURL_MULTI
610 struct fill_chain {
611 void *data;
612 int (*fill)(void *);
613 struct fill_chain *next;
614 };
615
616 static struct fill_chain *fill_cfg;
617
618 void add_fill_function(void *data, int (*fill)(void *))
619 {
620 struct fill_chain *new = xmalloc(sizeof(*new));
621 struct fill_chain **linkp = &fill_cfg;
622 new->data = data;
623 new->fill = fill;
624 new->next = NULL;
625 while (*linkp)
626 linkp = &(*linkp)->next;
627 *linkp = new;
628 }
629
630 void fill_active_slots(void)
631 {
632 struct active_request_slot *slot = active_queue_head;
633
634 while (active_requests < max_requests) {
635 struct fill_chain *fill;
636 for (fill = fill_cfg; fill; fill = fill->next)
637 if (fill->fill(fill->data))
638 break;
639
640 if (!fill)
641 break;
642 }
643
644 while (slot != NULL) {
645 if (!slot->in_use && slot->curl != NULL
646 && curl_session_count > min_curl_sessions) {
647 curl_easy_cleanup(slot->curl);
648 slot->curl = NULL;
649 curl_session_count--;
650 }
651 slot = slot->next;
652 }
653 }
654
655 void step_active_slots(void)
656 {
657 int num_transfers;
658 CURLMcode curlm_result;
659
660 do {
661 curlm_result = curl_multi_perform(curlm, &num_transfers);
662 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
663 if (num_transfers < active_requests) {
664 process_curl_messages();
665 fill_active_slots();
666 }
667 }
668 #endif
669
670 void run_active_slot(struct active_request_slot *slot)
671 {
672 #ifdef USE_CURL_MULTI
673 fd_set readfds;
674 fd_set writefds;
675 fd_set excfds;
676 int max_fd;
677 struct timeval select_timeout;
678 int finished = 0;
679
680 slot->finished = &finished;
681 while (!finished) {
682 step_active_slots();
683
684 if (slot->in_use) {
685 #if LIBCURL_VERSION_NUM >= 0x070f04
686 long curl_timeout;
687 curl_multi_timeout(curlm, &curl_timeout);
688 if (curl_timeout == 0) {
689 continue;
690 } else if (curl_timeout == -1) {
691 select_timeout.tv_sec = 0;
692 select_timeout.tv_usec = 50000;
693 } else {
694 select_timeout.tv_sec = curl_timeout / 1000;
695 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
696 }
697 #else
698 select_timeout.tv_sec = 0;
699 select_timeout.tv_usec = 50000;
700 #endif
701
702 max_fd = -1;
703 FD_ZERO(&readfds);
704 FD_ZERO(&writefds);
705 FD_ZERO(&excfds);
706 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
707
708 /*
709 * It can happen that curl_multi_timeout returns a pathologically
710 * long timeout when curl_multi_fdset returns no file descriptors
711 * to read. See commit message for more details.
712 */
713 if (max_fd < 0 &&
714 (select_timeout.tv_sec > 0 ||
715 select_timeout.tv_usec > 50000)) {
716 select_timeout.tv_sec = 0;
717 select_timeout.tv_usec = 50000;
718 }
719
720 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
721 }
722 }
723 #else
724 while (slot->in_use) {
725 slot->curl_result = curl_easy_perform(slot->curl);
726 finish_active_slot(slot);
727 }
728 #endif
729 }
730
731 static void closedown_active_slot(struct active_request_slot *slot)
732 {
733 active_requests--;
734 slot->in_use = 0;
735 }
736
737 static void release_active_slot(struct active_request_slot *slot)
738 {
739 closedown_active_slot(slot);
740 if (slot->curl && curl_session_count > min_curl_sessions) {
741 #ifdef USE_CURL_MULTI
742 curl_multi_remove_handle(curlm, slot->curl);
743 #endif
744 curl_easy_cleanup(slot->curl);
745 slot->curl = NULL;
746 curl_session_count--;
747 }
748 #ifdef USE_CURL_MULTI
749 fill_active_slots();
750 #endif
751 }
752
753 void finish_active_slot(struct active_request_slot *slot)
754 {
755 closedown_active_slot(slot);
756 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
757
758 if (slot->finished != NULL)
759 (*slot->finished) = 1;
760
761 /* Store slot results so they can be read after the slot is reused */
762 if (slot->results != NULL) {
763 slot->results->curl_result = slot->curl_result;
764 slot->results->http_code = slot->http_code;
765 #if LIBCURL_VERSION_NUM >= 0x070a08
766 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
767 &slot->results->auth_avail);
768 #else
769 slot->results->auth_avail = 0;
770 #endif
771 }
772
773 /* Run callback if appropriate */
774 if (slot->callback_func != NULL)
775 slot->callback_func(slot->callback_data);
776 }
777
778 void finish_all_active_slots(void)
779 {
780 struct active_request_slot *slot = active_queue_head;
781
782 while (slot != NULL)
783 if (slot->in_use) {
784 run_active_slot(slot);
785 slot = active_queue_head;
786 } else {
787 slot = slot->next;
788 }
789 }
790
791 /* Helpers for modifying and creating URLs */
792 static inline int needs_quote(int ch)
793 {
794 if (((ch >= 'A') && (ch <= 'Z'))
795 || ((ch >= 'a') && (ch <= 'z'))
796 || ((ch >= '0') && (ch <= '9'))
797 || (ch == '/')
798 || (ch == '-')
799 || (ch == '.'))
800 return 0;
801 return 1;
802 }
803
804 static char *quote_ref_url(const char *base, const char *ref)
805 {
806 struct strbuf buf = STRBUF_INIT;
807 const char *cp;
808 int ch;
809
810 end_url_with_slash(&buf, base);
811
812 for (cp = ref; (ch = *cp) != 0; cp++)
813 if (needs_quote(ch))
814 strbuf_addf(&buf, "%%%02x", ch);
815 else
816 strbuf_addch(&buf, *cp);
817
818 return strbuf_detach(&buf, NULL);
819 }
820
821 void append_remote_object_url(struct strbuf *buf, const char *url,
822 const char *hex,
823 int only_two_digit_prefix)
824 {
825 end_url_with_slash(buf, url);
826
827 strbuf_addf(buf, "objects/%.*s/", 2, hex);
828 if (!only_two_digit_prefix)
829 strbuf_addf(buf, "%s", hex+2);
830 }
831
832 char *get_remote_object_url(const char *url, const char *hex,
833 int only_two_digit_prefix)
834 {
835 struct strbuf buf = STRBUF_INIT;
836 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
837 return strbuf_detach(&buf, NULL);
838 }
839
840 int handle_curl_result(struct slot_results *results)
841 {
842 /*
843 * If we see a failing http code with CURLE_OK, we have turned off
844 * FAILONERROR (to keep the server's custom error response), and should
845 * translate the code into failure here.
846 */
847 if (results->curl_result == CURLE_OK &&
848 results->http_code >= 400) {
849 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
850 /*
851 * Normally curl will already have put the "reason phrase"
852 * from the server into curl_errorstr; unfortunately without
853 * FAILONERROR it is lost, so we can give only the numeric
854 * status code.
855 */
856 snprintf(curl_errorstr, sizeof(curl_errorstr),
857 "The requested URL returned error: %ld",
858 results->http_code);
859 }
860
861 if (results->curl_result == CURLE_OK) {
862 credential_approve(&http_auth);
863 return HTTP_OK;
864 } else if (missing_target(results))
865 return HTTP_MISSING_TARGET;
866 else if (results->http_code == 401) {
867 if (http_auth.username && http_auth.password) {
868 credential_reject(&http_auth);
869 return HTTP_NOAUTH;
870 } else {
871 return HTTP_REAUTH;
872 }
873 } else {
874 #if LIBCURL_VERSION_NUM >= 0x070c00
875 if (!curl_errorstr[0])
876 strlcpy(curl_errorstr,
877 curl_easy_strerror(results->curl_result),
878 sizeof(curl_errorstr));
879 #endif
880 return HTTP_ERROR;
881 }
882 }
883
884 int run_one_slot(struct active_request_slot *slot,
885 struct slot_results *results)
886 {
887 slot->results = results;
888 if (!start_active_slot(slot)) {
889 snprintf(curl_errorstr, sizeof(curl_errorstr),
890 "failed to start HTTP request");
891 return HTTP_START_FAILED;
892 }
893
894 run_active_slot(slot);
895 return handle_curl_result(results);
896 }
897
898 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
899 {
900 char *ptr;
901 CURLcode ret;
902
903 strbuf_reset(buf);
904 ret = curl_easy_getinfo(curl, info, &ptr);
905 if (!ret && ptr)
906 strbuf_addstr(buf, ptr);
907 return ret;
908 }
909
910 /*
911 * Check for and extract a content-type parameter. "raw"
912 * should be positioned at the start of the potential
913 * parameter, with any whitespace already removed.
914 *
915 * "name" is the name of the parameter. The value is appended
916 * to "out".
917 */
918 static int extract_param(const char *raw, const char *name,
919 struct strbuf *out)
920 {
921 size_t len = strlen(name);
922
923 if (strncasecmp(raw, name, len))
924 return -1;
925 raw += len;
926
927 if (*raw != '=')
928 return -1;
929 raw++;
930
931 while (*raw && !isspace(*raw) && *raw != ';')
932 strbuf_addch(out, *raw++);
933 return 0;
934 }
935
936 /*
937 * Extract a normalized version of the content type, with any
938 * spaces suppressed, all letters lowercased, and no trailing ";"
939 * or parameters.
940 *
941 * Note that we will silently remove even invalid whitespace. For
942 * example, "text / plain" is specifically forbidden by RFC 2616,
943 * but "text/plain" is the only reasonable output, and this keeps
944 * our code simple.
945 *
946 * If the "charset" argument is not NULL, store the value of any
947 * charset parameter there.
948 *
949 * Example:
950 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
951 * "text / plain" -> "text/plain"
952 */
953 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
954 struct strbuf *charset)
955 {
956 const char *p;
957
958 strbuf_reset(type);
959 strbuf_grow(type, raw->len);
960 for (p = raw->buf; *p; p++) {
961 if (isspace(*p))
962 continue;
963 if (*p == ';') {
964 p++;
965 break;
966 }
967 strbuf_addch(type, tolower(*p));
968 }
969
970 if (!charset)
971 return;
972
973 strbuf_reset(charset);
974 while (*p) {
975 while (isspace(*p) || *p == ';')
976 p++;
977 if (!extract_param(p, "charset", charset))
978 return;
979 while (*p && !isspace(*p))
980 p++;
981 }
982
983 if (!charset->len && starts_with(type->buf, "text/"))
984 strbuf_addstr(charset, "ISO-8859-1");
985 }
986
987 /* http_request() targets */
988 #define HTTP_REQUEST_STRBUF 0
989 #define HTTP_REQUEST_FILE 1
990
991 static int http_request(const char *url,
992 void *result, int target,
993 const struct http_get_options *options)
994 {
995 struct active_request_slot *slot;
996 struct slot_results results;
997 struct curl_slist *headers = NULL;
998 struct strbuf buf = STRBUF_INIT;
999 int ret;
1000
1001 slot = get_active_slot();
1002 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1003
1004 if (result == NULL) {
1005 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1006 } else {
1007 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1008 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1009
1010 if (target == HTTP_REQUEST_FILE) {
1011 long posn = ftell(result);
1012 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1013 fwrite);
1014 if (posn > 0) {
1015 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1016 headers = curl_slist_append(headers, buf.buf);
1017 strbuf_reset(&buf);
1018 }
1019 } else
1020 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1021 fwrite_buffer);
1022 }
1023
1024 strbuf_addstr(&buf, "Pragma:");
1025 if (options && options->no_cache)
1026 strbuf_addstr(&buf, " no-cache");
1027 if (options && options->keep_error)
1028 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1029
1030 headers = curl_slist_append(headers, buf.buf);
1031
1032 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1033 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1034 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1035
1036 ret = run_one_slot(slot, &results);
1037
1038 if (options && options->content_type) {
1039 struct strbuf raw = STRBUF_INIT;
1040 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1041 extract_content_type(&raw, options->content_type,
1042 options->charset);
1043 strbuf_release(&raw);
1044 }
1045
1046 if (options && options->effective_url)
1047 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1048 options->effective_url);
1049
1050 curl_slist_free_all(headers);
1051 strbuf_release(&buf);
1052
1053 return ret;
1054 }
1055
1056 /*
1057 * Update the "base" url to a more appropriate value, as deduced by
1058 * redirects seen when requesting a URL starting with "url".
1059 *
1060 * The "asked" parameter is a URL that we asked curl to access, and must begin
1061 * with "base".
1062 *
1063 * The "got" parameter is the URL that curl reported to us as where we ended
1064 * up.
1065 *
1066 * Returns 1 if we updated the base url, 0 otherwise.
1067 *
1068 * Our basic strategy is to compare "base" and "asked" to find the bits
1069 * specific to our request. We then strip those bits off of "got" to yield the
1070 * new base. So for example, if our base is "http://example.com/foo.git",
1071 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1072 * with "https://other.example.com/foo.git/info/refs". We would want the
1073 * new URL to become "https://other.example.com/foo.git".
1074 *
1075 * Note that this assumes a sane redirect scheme. It's entirely possible
1076 * in the example above to end up at a URL that does not even end in
1077 * "info/refs". In such a case we simply punt, as there is not much we can
1078 * do (and such a scheme is unlikely to represent a real git repository,
1079 * which means we are likely about to abort anyway).
1080 */
1081 static int update_url_from_redirect(struct strbuf *base,
1082 const char *asked,
1083 const struct strbuf *got)
1084 {
1085 const char *tail;
1086 size_t tail_len;
1087
1088 if (!strcmp(asked, got->buf))
1089 return 0;
1090
1091 if (!skip_prefix(asked, base->buf, &tail))
1092 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1093 asked, base->buf);
1094
1095 tail_len = strlen(tail);
1096
1097 if (got->len < tail_len ||
1098 strcmp(tail, got->buf + got->len - tail_len))
1099 return 0; /* insane redirect scheme */
1100
1101 strbuf_reset(base);
1102 strbuf_add(base, got->buf, got->len - tail_len);
1103 return 1;
1104 }
1105
1106 static int http_request_reauth(const char *url,
1107 void *result, int target,
1108 struct http_get_options *options)
1109 {
1110 int ret = http_request(url, result, target, options);
1111
1112 if (options && options->effective_url && options->base_url) {
1113 if (update_url_from_redirect(options->base_url,
1114 url, options->effective_url)) {
1115 credential_from_url(&http_auth, options->base_url->buf);
1116 url = options->effective_url->buf;
1117 }
1118 }
1119
1120 if (ret != HTTP_REAUTH)
1121 return ret;
1122
1123 /*
1124 * If we are using KEEP_ERROR, the previous request may have
1125 * put cruft into our output stream; we should clear it out before
1126 * making our next request. We only know how to do this for
1127 * the strbuf case, but that is enough to satisfy current callers.
1128 */
1129 if (options && options->keep_error) {
1130 switch (target) {
1131 case HTTP_REQUEST_STRBUF:
1132 strbuf_reset(result);
1133 break;
1134 default:
1135 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1136 }
1137 }
1138
1139 credential_fill(&http_auth);
1140
1141 return http_request(url, result, target, options);
1142 }
1143
1144 int http_get_strbuf(const char *url,
1145 struct strbuf *result,
1146 struct http_get_options *options)
1147 {
1148 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1149 }
1150
1151 /*
1152 * Downloads a URL and stores the result in the given file.
1153 *
1154 * If a previous interrupted download is detected (i.e. a previous temporary
1155 * file is still around) the download is resumed.
1156 */
1157 static int http_get_file(const char *url, const char *filename,
1158 struct http_get_options *options)
1159 {
1160 int ret;
1161 struct strbuf tmpfile = STRBUF_INIT;
1162 FILE *result;
1163
1164 strbuf_addf(&tmpfile, "%s.temp", filename);
1165 result = fopen(tmpfile.buf, "a");
1166 if (!result) {
1167 error("Unable to open local file %s", tmpfile.buf);
1168 ret = HTTP_ERROR;
1169 goto cleanup;
1170 }
1171
1172 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1173 fclose(result);
1174
1175 if (ret == HTTP_OK && move_temp_to_file(tmpfile.buf, filename))
1176 ret = HTTP_ERROR;
1177 cleanup:
1178 strbuf_release(&tmpfile);
1179 return ret;
1180 }
1181
1182 int http_fetch_ref(const char *base, struct ref *ref)
1183 {
1184 struct http_get_options options = {0};
1185 char *url;
1186 struct strbuf buffer = STRBUF_INIT;
1187 int ret = -1;
1188
1189 options.no_cache = 1;
1190
1191 url = quote_ref_url(base, ref->name);
1192 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1193 strbuf_rtrim(&buffer);
1194 if (buffer.len == 40)
1195 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1196 else if (starts_with(buffer.buf, "ref: ")) {
1197 ref->symref = xstrdup(buffer.buf + 5);
1198 ret = 0;
1199 }
1200 }
1201
1202 strbuf_release(&buffer);
1203 free(url);
1204 return ret;
1205 }
1206
1207 /* Helpers for fetching packs */
1208 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1209 {
1210 char *url, *tmp;
1211 struct strbuf buf = STRBUF_INIT;
1212
1213 if (http_is_verbose)
1214 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1215
1216 end_url_with_slash(&buf, base_url);
1217 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1218 url = strbuf_detach(&buf, NULL);
1219
1220 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1221 tmp = strbuf_detach(&buf, NULL);
1222
1223 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1224 error("Unable to get pack index %s", url);
1225 free(tmp);
1226 tmp = NULL;
1227 }
1228
1229 free(url);
1230 return tmp;
1231 }
1232
1233 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1234 unsigned char *sha1, const char *base_url)
1235 {
1236 struct packed_git *new_pack;
1237 char *tmp_idx = NULL;
1238 int ret;
1239
1240 if (has_pack_index(sha1)) {
1241 new_pack = parse_pack_index(sha1, NULL);
1242 if (!new_pack)
1243 return -1; /* parse_pack_index() already issued error message */
1244 goto add_pack;
1245 }
1246
1247 tmp_idx = fetch_pack_index(sha1, base_url);
1248 if (!tmp_idx)
1249 return -1;
1250
1251 new_pack = parse_pack_index(sha1, tmp_idx);
1252 if (!new_pack) {
1253 unlink(tmp_idx);
1254 free(tmp_idx);
1255
1256 return -1; /* parse_pack_index() already issued error message */
1257 }
1258
1259 ret = verify_pack_index(new_pack);
1260 if (!ret) {
1261 close_pack_index(new_pack);
1262 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1263 }
1264 free(tmp_idx);
1265 if (ret)
1266 return -1;
1267
1268 add_pack:
1269 new_pack->next = *packs_head;
1270 *packs_head = new_pack;
1271 return 0;
1272 }
1273
1274 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1275 {
1276 struct http_get_options options = {0};
1277 int ret = 0, i = 0;
1278 char *url, *data;
1279 struct strbuf buf = STRBUF_INIT;
1280 unsigned char sha1[20];
1281
1282 end_url_with_slash(&buf, base_url);
1283 strbuf_addstr(&buf, "objects/info/packs");
1284 url = strbuf_detach(&buf, NULL);
1285
1286 options.no_cache = 1;
1287 ret = http_get_strbuf(url, &buf, &options);
1288 if (ret != HTTP_OK)
1289 goto cleanup;
1290
1291 data = buf.buf;
1292 while (i < buf.len) {
1293 switch (data[i]) {
1294 case 'P':
1295 i++;
1296 if (i + 52 <= buf.len &&
1297 starts_with(data + i, " pack-") &&
1298 starts_with(data + i + 46, ".pack\n")) {
1299 get_sha1_hex(data + i + 6, sha1);
1300 fetch_and_setup_pack_index(packs_head, sha1,
1301 base_url);
1302 i += 51;
1303 break;
1304 }
1305 default:
1306 while (i < buf.len && data[i] != '\n')
1307 i++;
1308 }
1309 i++;
1310 }
1311
1312 cleanup:
1313 free(url);
1314 return ret;
1315 }
1316
1317 void release_http_pack_request(struct http_pack_request *preq)
1318 {
1319 if (preq->packfile != NULL) {
1320 fclose(preq->packfile);
1321 preq->packfile = NULL;
1322 }
1323 if (preq->range_header != NULL) {
1324 curl_slist_free_all(preq->range_header);
1325 preq->range_header = NULL;
1326 }
1327 preq->slot = NULL;
1328 free(preq->url);
1329 }
1330
1331 int finish_http_pack_request(struct http_pack_request *preq)
1332 {
1333 struct packed_git **lst;
1334 struct packed_git *p = preq->target;
1335 char *tmp_idx;
1336 struct child_process ip;
1337 const char *ip_argv[8];
1338
1339 close_pack_index(p);
1340
1341 fclose(preq->packfile);
1342 preq->packfile = NULL;
1343
1344 lst = preq->lst;
1345 while (*lst != p)
1346 lst = &((*lst)->next);
1347 *lst = (*lst)->next;
1348
1349 tmp_idx = xstrdup(preq->tmpfile);
1350 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1351 ".idx.temp");
1352
1353 ip_argv[0] = "index-pack";
1354 ip_argv[1] = "-o";
1355 ip_argv[2] = tmp_idx;
1356 ip_argv[3] = preq->tmpfile;
1357 ip_argv[4] = NULL;
1358
1359 memset(&ip, 0, sizeof(ip));
1360 ip.argv = ip_argv;
1361 ip.git_cmd = 1;
1362 ip.no_stdin = 1;
1363 ip.no_stdout = 1;
1364
1365 if (run_command(&ip)) {
1366 unlink(preq->tmpfile);
1367 unlink(tmp_idx);
1368 free(tmp_idx);
1369 return -1;
1370 }
1371
1372 unlink(sha1_pack_index_name(p->sha1));
1373
1374 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1375 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1376 free(tmp_idx);
1377 return -1;
1378 }
1379
1380 install_packed_git(p);
1381 free(tmp_idx);
1382 return 0;
1383 }
1384
1385 struct http_pack_request *new_http_pack_request(
1386 struct packed_git *target, const char *base_url)
1387 {
1388 long prev_posn = 0;
1389 char range[RANGE_HEADER_SIZE];
1390 struct strbuf buf = STRBUF_INIT;
1391 struct http_pack_request *preq;
1392
1393 preq = xcalloc(1, sizeof(*preq));
1394 preq->target = target;
1395
1396 end_url_with_slash(&buf, base_url);
1397 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1398 sha1_to_hex(target->sha1));
1399 preq->url = strbuf_detach(&buf, NULL);
1400
1401 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1402 sha1_pack_name(target->sha1));
1403 preq->packfile = fopen(preq->tmpfile, "a");
1404 if (!preq->packfile) {
1405 error("Unable to open local file %s for pack",
1406 preq->tmpfile);
1407 goto abort;
1408 }
1409
1410 preq->slot = get_active_slot();
1411 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1412 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1413 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1414 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1415 no_pragma_header);
1416
1417 /*
1418 * If there is data present from a previous transfer attempt,
1419 * resume where it left off
1420 */
1421 prev_posn = ftell(preq->packfile);
1422 if (prev_posn>0) {
1423 if (http_is_verbose)
1424 fprintf(stderr,
1425 "Resuming fetch of pack %s at byte %ld\n",
1426 sha1_to_hex(target->sha1), prev_posn);
1427 sprintf(range, "Range: bytes=%ld-", prev_posn);
1428 preq->range_header = curl_slist_append(NULL, range);
1429 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1430 preq->range_header);
1431 }
1432
1433 return preq;
1434
1435 abort:
1436 free(preq->url);
1437 free(preq);
1438 return NULL;
1439 }
1440
1441 /* Helpers for fetching objects (loose) */
1442 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1443 void *data)
1444 {
1445 unsigned char expn[4096];
1446 size_t size = eltsize * nmemb;
1447 int posn = 0;
1448 struct http_object_request *freq =
1449 (struct http_object_request *)data;
1450 do {
1451 ssize_t retval = xwrite(freq->localfile,
1452 (char *) ptr + posn, size - posn);
1453 if (retval < 0)
1454 return posn;
1455 posn += retval;
1456 } while (posn < size);
1457
1458 freq->stream.avail_in = size;
1459 freq->stream.next_in = (void *)ptr;
1460 do {
1461 freq->stream.next_out = expn;
1462 freq->stream.avail_out = sizeof(expn);
1463 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1464 git_SHA1_Update(&freq->c, expn,
1465 sizeof(expn) - freq->stream.avail_out);
1466 } while (freq->stream.avail_in && freq->zret == Z_OK);
1467 return size;
1468 }
1469
1470 struct http_object_request *new_http_object_request(const char *base_url,
1471 unsigned char *sha1)
1472 {
1473 char *hex = sha1_to_hex(sha1);
1474 const char *filename;
1475 char prevfile[PATH_MAX];
1476 int prevlocal;
1477 char prev_buf[PREV_BUF_SIZE];
1478 ssize_t prev_read = 0;
1479 long prev_posn = 0;
1480 char range[RANGE_HEADER_SIZE];
1481 struct curl_slist *range_header = NULL;
1482 struct http_object_request *freq;
1483
1484 freq = xcalloc(1, sizeof(*freq));
1485 hashcpy(freq->sha1, sha1);
1486 freq->localfile = -1;
1487
1488 filename = sha1_file_name(sha1);
1489 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1490 "%s.temp", filename);
1491
1492 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1493 unlink_or_warn(prevfile);
1494 rename(freq->tmpfile, prevfile);
1495 unlink_or_warn(freq->tmpfile);
1496
1497 if (freq->localfile != -1)
1498 error("fd leakage in start: %d", freq->localfile);
1499 freq->localfile = open(freq->tmpfile,
1500 O_WRONLY | O_CREAT | O_EXCL, 0666);
1501 /*
1502 * This could have failed due to the "lazy directory creation";
1503 * try to mkdir the last path component.
1504 */
1505 if (freq->localfile < 0 && errno == ENOENT) {
1506 char *dir = strrchr(freq->tmpfile, '/');
1507 if (dir) {
1508 *dir = 0;
1509 mkdir(freq->tmpfile, 0777);
1510 *dir = '/';
1511 }
1512 freq->localfile = open(freq->tmpfile,
1513 O_WRONLY | O_CREAT | O_EXCL, 0666);
1514 }
1515
1516 if (freq->localfile < 0) {
1517 error("Couldn't create temporary file %s: %s",
1518 freq->tmpfile, strerror(errno));
1519 goto abort;
1520 }
1521
1522 git_inflate_init(&freq->stream);
1523
1524 git_SHA1_Init(&freq->c);
1525
1526 freq->url = get_remote_object_url(base_url, hex, 0);
1527
1528 /*
1529 * If a previous temp file is present, process what was already
1530 * fetched.
1531 */
1532 prevlocal = open(prevfile, O_RDONLY);
1533 if (prevlocal != -1) {
1534 do {
1535 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1536 if (prev_read>0) {
1537 if (fwrite_sha1_file(prev_buf,
1538 1,
1539 prev_read,
1540 freq) == prev_read) {
1541 prev_posn += prev_read;
1542 } else {
1543 prev_read = -1;
1544 }
1545 }
1546 } while (prev_read > 0);
1547 close(prevlocal);
1548 }
1549 unlink_or_warn(prevfile);
1550
1551 /*
1552 * Reset inflate/SHA1 if there was an error reading the previous temp
1553 * file; also rewind to the beginning of the local file.
1554 */
1555 if (prev_read == -1) {
1556 memset(&freq->stream, 0, sizeof(freq->stream));
1557 git_inflate_init(&freq->stream);
1558 git_SHA1_Init(&freq->c);
1559 if (prev_posn>0) {
1560 prev_posn = 0;
1561 lseek(freq->localfile, 0, SEEK_SET);
1562 if (ftruncate(freq->localfile, 0) < 0) {
1563 error("Couldn't truncate temporary file %s: %s",
1564 freq->tmpfile, strerror(errno));
1565 goto abort;
1566 }
1567 }
1568 }
1569
1570 freq->slot = get_active_slot();
1571
1572 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1573 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1574 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1575 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1576 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1577
1578 /*
1579 * If we have successfully processed data from a previous fetch
1580 * attempt, only fetch the data we don't already have.
1581 */
1582 if (prev_posn>0) {
1583 if (http_is_verbose)
1584 fprintf(stderr,
1585 "Resuming fetch of object %s at byte %ld\n",
1586 hex, prev_posn);
1587 sprintf(range, "Range: bytes=%ld-", prev_posn);
1588 range_header = curl_slist_append(range_header, range);
1589 curl_easy_setopt(freq->slot->curl,
1590 CURLOPT_HTTPHEADER, range_header);
1591 }
1592
1593 return freq;
1594
1595 abort:
1596 free(freq->url);
1597 free(freq);
1598 return NULL;
1599 }
1600
1601 void process_http_object_request(struct http_object_request *freq)
1602 {
1603 if (freq->slot == NULL)
1604 return;
1605 freq->curl_result = freq->slot->curl_result;
1606 freq->http_code = freq->slot->http_code;
1607 freq->slot = NULL;
1608 }
1609
1610 int finish_http_object_request(struct http_object_request *freq)
1611 {
1612 struct stat st;
1613
1614 close(freq->localfile);
1615 freq->localfile = -1;
1616
1617 process_http_object_request(freq);
1618
1619 if (freq->http_code == 416) {
1620 warning("requested range invalid; we may already have all the data.");
1621 } else if (freq->curl_result != CURLE_OK) {
1622 if (stat(freq->tmpfile, &st) == 0)
1623 if (st.st_size == 0)
1624 unlink_or_warn(freq->tmpfile);
1625 return -1;
1626 }
1627
1628 git_inflate_end(&freq->stream);
1629 git_SHA1_Final(freq->real_sha1, &freq->c);
1630 if (freq->zret != Z_STREAM_END) {
1631 unlink_or_warn(freq->tmpfile);
1632 return -1;
1633 }
1634 if (hashcmp(freq->sha1, freq->real_sha1)) {
1635 unlink_or_warn(freq->tmpfile);
1636 return -1;
1637 }
1638 freq->rename =
1639 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1640
1641 return freq->rename;
1642 }
1643
1644 void abort_http_object_request(struct http_object_request *freq)
1645 {
1646 unlink_or_warn(freq->tmpfile);
1647
1648 release_http_object_request(freq);
1649 }
1650
1651 void release_http_object_request(struct http_object_request *freq)
1652 {
1653 if (freq->localfile != -1) {
1654 close(freq->localfile);
1655 freq->localfile = -1;
1656 }
1657 if (freq->url != NULL) {
1658 free(freq->url);
1659 freq->url = NULL;
1660 }
1661 if (freq->slot != NULL) {
1662 freq->slot->callback_func = NULL;
1663 freq->slot->callback_data = NULL;
1664 release_active_slot(freq->slot);
1665 freq->slot = NULL;
1666 }
1667 }
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