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line-log.c: make line_log_data_init() static
[git.git] / http.c
blob16a6a2d934515b43612d587db5632f8774706230
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 static void closedown_active_slot(struct active_request_slot *slot)
118 {
119 active_requests--;
120 slot->in_use = 0;
121 }
122
123 static void finish_active_slot(struct active_request_slot *slot)
124 {
125 closedown_active_slot(slot);
126 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
127
128 if (slot->finished != NULL)
129 (*slot->finished) = 1;
130
131 /* Store slot results so they can be read after the slot is reused */
132 if (slot->results != NULL) {
133 slot->results->curl_result = slot->curl_result;
134 slot->results->http_code = slot->http_code;
135 #if LIBCURL_VERSION_NUM >= 0x070a08
136 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
137 &slot->results->auth_avail);
138 #else
139 slot->results->auth_avail = 0;
140 #endif
141 }
142
143 /* Run callback if appropriate */
144 if (slot->callback_func != NULL)
145 slot->callback_func(slot->callback_data);
146 }
147
148 #ifdef USE_CURL_MULTI
149 static void process_curl_messages(void)
150 {
151 int num_messages;
152 struct active_request_slot *slot;
153 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
154
155 while (curl_message != NULL) {
156 if (curl_message->msg == CURLMSG_DONE) {
157 int curl_result = curl_message->data.result;
158 slot = active_queue_head;
159 while (slot != NULL &&
160 slot->curl != curl_message->easy_handle)
161 slot = slot->next;
162 if (slot != NULL) {
163 curl_multi_remove_handle(curlm, slot->curl);
164 slot->curl_result = curl_result;
165 finish_active_slot(slot);
166 } else {
167 fprintf(stderr, "Received DONE message for unknown request!\n");
168 }
169 } else {
170 fprintf(stderr, "Unknown CURL message received: %d\n",
171 (int)curl_message->msg);
172 }
173 curl_message = curl_multi_info_read(curlm, &num_messages);
174 }
175 }
176 #endif
177
178 static int http_options(const char *var, const char *value, void *cb)
179 {
180 if (!strcmp("http.sslverify", var)) {
181 curl_ssl_verify = git_config_bool(var, value);
182 return 0;
183 }
184 if (!strcmp("http.sslcert", var))
185 return git_config_string(&ssl_cert, var, value);
186 #if LIBCURL_VERSION_NUM >= 0x070903
187 if (!strcmp("http.sslkey", var))
188 return git_config_string(&ssl_key, var, value);
189 #endif
190 #if LIBCURL_VERSION_NUM >= 0x070908
191 if (!strcmp("http.sslcapath", var))
192 return git_config_string(&ssl_capath, var, value);
193 #endif
194 if (!strcmp("http.sslcainfo", var))
195 return git_config_string(&ssl_cainfo, var, value);
196 if (!strcmp("http.sslcertpasswordprotected", var)) {
197 ssl_cert_password_required = git_config_bool(var, value);
198 return 0;
199 }
200 if (!strcmp("http.ssltry", var)) {
201 curl_ssl_try = git_config_bool(var, value);
202 return 0;
203 }
204 if (!strcmp("http.minsessions", var)) {
205 min_curl_sessions = git_config_int(var, value);
206 #ifndef USE_CURL_MULTI
207 if (min_curl_sessions > 1)
208 min_curl_sessions = 1;
209 #endif
210 return 0;
211 }
212 #ifdef USE_CURL_MULTI
213 if (!strcmp("http.maxrequests", var)) {
214 max_requests = git_config_int(var, value);
215 return 0;
216 }
217 #endif
218 if (!strcmp("http.lowspeedlimit", var)) {
219 curl_low_speed_limit = (long)git_config_int(var, value);
220 return 0;
221 }
222 if (!strcmp("http.lowspeedtime", var)) {
223 curl_low_speed_time = (long)git_config_int(var, value);
224 return 0;
225 }
226
227 if (!strcmp("http.noepsv", var)) {
228 curl_ftp_no_epsv = git_config_bool(var, value);
229 return 0;
230 }
231 if (!strcmp("http.proxy", var))
232 return git_config_string(&curl_http_proxy, var, value);
233
234 if (!strcmp("http.cookiefile", var))
235 return git_config_string(&curl_cookie_file, var, value);
236 if (!strcmp("http.savecookies", var)) {
237 curl_save_cookies = git_config_bool(var, value);
238 return 0;
239 }
240
241 if (!strcmp("http.postbuffer", var)) {
242 http_post_buffer = git_config_int(var, value);
243 if (http_post_buffer < LARGE_PACKET_MAX)
244 http_post_buffer = LARGE_PACKET_MAX;
245 return 0;
246 }
247
248 if (!strcmp("http.useragent", var))
249 return git_config_string(&user_agent, var, value);
250
251 /* Fall back on the default ones */
252 return git_default_config(var, value, cb);
253 }
254
255 static void init_curl_http_auth(CURL *result)
256 {
257 if (!http_auth.username)
258 return;
259
260 credential_fill(&http_auth);
261
262 #if LIBCURL_VERSION_NUM >= 0x071301
263 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
264 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
265 #else
266 {
267 static struct strbuf up = STRBUF_INIT;
268 /*
269 * Note that we assume we only ever have a single set of
270 * credentials in a given program run, so we do not have
271 * to worry about updating this buffer, only setting its
272 * initial value.
273 */
274 if (!up.len)
275 strbuf_addf(&up, "%s:%s",
276 http_auth.username, http_auth.password);
277 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
278 }
279 #endif
280 }
281
282 static int has_cert_password(void)
283 {
284 if (ssl_cert == NULL || ssl_cert_password_required != 1)
285 return 0;
286 if (!cert_auth.password) {
287 cert_auth.protocol = xstrdup("cert");
288 cert_auth.username = xstrdup("");
289 cert_auth.path = xstrdup(ssl_cert);
290 credential_fill(&cert_auth);
291 }
292 return 1;
293 }
294
295 #if LIBCURL_VERSION_NUM >= 0x071900
296 static void set_curl_keepalive(CURL *c)
297 {
298 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
299 }
300
301 #elif LIBCURL_VERSION_NUM >= 0x071000
302 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
303 {
304 int ka = 1;
305 int rc;
306 socklen_t len = (socklen_t)sizeof(ka);
307
308 if (type != CURLSOCKTYPE_IPCXN)
309 return 0;
310
311 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
312 if (rc < 0)
313 warning("unable to set SO_KEEPALIVE on socket %s",
314 strerror(errno));
315
316 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
317 }
318
319 static void set_curl_keepalive(CURL *c)
320 {
321 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
322 }
323
324 #else
325 static void set_curl_keepalive(CURL *c)
326 {
327 /* not supported on older curl versions */
328 }
329 #endif
330
331 static CURL *get_curl_handle(void)
332 {
333 CURL *result = curl_easy_init();
334
335 if (!result)
336 die("curl_easy_init failed");
337
338 if (!curl_ssl_verify) {
339 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
340 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
341 } else {
342 /* Verify authenticity of the peer's certificate */
343 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
344 /* The name in the cert must match whom we tried to connect */
345 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
346 }
347
348 #if LIBCURL_VERSION_NUM >= 0x070907
349 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
350 #endif
351 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
352 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
353 #endif
354
355 if (http_proactive_auth)
356 init_curl_http_auth(result);
357
358 if (ssl_cert != NULL)
359 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
360 if (has_cert_password())
361 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
362 #if LIBCURL_VERSION_NUM >= 0x070903
363 if (ssl_key != NULL)
364 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
365 #endif
366 #if LIBCURL_VERSION_NUM >= 0x070908
367 if (ssl_capath != NULL)
368 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
369 #endif
370 if (ssl_cainfo != NULL)
371 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
372
373 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
374 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
375 curl_low_speed_limit);
376 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
377 curl_low_speed_time);
378 }
379
380 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
381 #if LIBCURL_VERSION_NUM >= 0x071301
382 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
383 #elif LIBCURL_VERSION_NUM >= 0x071101
384 curl_easy_setopt(result, CURLOPT_POST301, 1);
385 #endif
386
387 if (getenv("GIT_CURL_VERBOSE"))
388 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
389
390 curl_easy_setopt(result, CURLOPT_USERAGENT,
391 user_agent ? user_agent : git_user_agent());
392
393 if (curl_ftp_no_epsv)
394 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
395
396 #ifdef CURLOPT_USE_SSL
397 if (curl_ssl_try)
398 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
399 #endif
400
401 if (curl_http_proxy) {
402 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
403 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
404 }
405
406 set_curl_keepalive(result);
407
408 return result;
409 }
410
411 static void set_from_env(const char **var, const char *envname)
412 {
413 const char *val = getenv(envname);
414 if (val)
415 *var = val;
416 }
417
418 void http_init(struct remote *remote, const char *url, int proactive_auth)
419 {
420 char *low_speed_limit;
421 char *low_speed_time;
422 char *normalized_url;
423 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
424
425 config.section = "http";
426 config.key = NULL;
427 config.collect_fn = http_options;
428 config.cascade_fn = git_default_config;
429 config.cb = NULL;
430
431 http_is_verbose = 0;
432 normalized_url = url_normalize(url, &config.url);
433
434 git_config(urlmatch_config_entry, &config);
435 free(normalized_url);
436
437 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
438 die("curl_global_init failed");
439
440 http_proactive_auth = proactive_auth;
441
442 if (remote && remote->http_proxy)
443 curl_http_proxy = xstrdup(remote->http_proxy);
444
445 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
446 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
447
448 #ifdef USE_CURL_MULTI
449 {
450 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
451 if (http_max_requests != NULL)
452 max_requests = atoi(http_max_requests);
453 }
454
455 curlm = curl_multi_init();
456 if (!curlm)
457 die("curl_multi_init failed");
458 #endif
459
460 if (getenv("GIT_SSL_NO_VERIFY"))
461 curl_ssl_verify = 0;
462
463 set_from_env(&ssl_cert, "GIT_SSL_CERT");
464 #if LIBCURL_VERSION_NUM >= 0x070903
465 set_from_env(&ssl_key, "GIT_SSL_KEY");
466 #endif
467 #if LIBCURL_VERSION_NUM >= 0x070908
468 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
469 #endif
470 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
471
472 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
473
474 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
475 if (low_speed_limit != NULL)
476 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
477 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
478 if (low_speed_time != NULL)
479 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
480
481 if (curl_ssl_verify == -1)
482 curl_ssl_verify = 1;
483
484 curl_session_count = 0;
485 #ifdef USE_CURL_MULTI
486 if (max_requests < 1)
487 max_requests = DEFAULT_MAX_REQUESTS;
488 #endif
489
490 if (getenv("GIT_CURL_FTP_NO_EPSV"))
491 curl_ftp_no_epsv = 1;
492
493 if (url) {
494 credential_from_url(&http_auth, url);
495 if (!ssl_cert_password_required &&
496 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
497 starts_with(url, "https://"))
498 ssl_cert_password_required = 1;
499 }
500
501 #ifndef NO_CURL_EASY_DUPHANDLE
502 curl_default = get_curl_handle();
503 #endif
504 }
505
506 void http_cleanup(void)
507 {
508 struct active_request_slot *slot = active_queue_head;
509
510 while (slot != NULL) {
511 struct active_request_slot *next = slot->next;
512 if (slot->curl != NULL) {
513 #ifdef USE_CURL_MULTI
514 curl_multi_remove_handle(curlm, slot->curl);
515 #endif
516 curl_easy_cleanup(slot->curl);
517 }
518 free(slot);
519 slot = next;
520 }
521 active_queue_head = NULL;
522
523 #ifndef NO_CURL_EASY_DUPHANDLE
524 curl_easy_cleanup(curl_default);
525 #endif
526
527 #ifdef USE_CURL_MULTI
528 curl_multi_cleanup(curlm);
529 #endif
530 curl_global_cleanup();
531
532 curl_slist_free_all(pragma_header);
533 pragma_header = NULL;
534
535 curl_slist_free_all(no_pragma_header);
536 no_pragma_header = NULL;
537
538 if (curl_http_proxy) {
539 free((void *)curl_http_proxy);
540 curl_http_proxy = NULL;
541 }
542
543 if (cert_auth.password != NULL) {
544 memset(cert_auth.password, 0, strlen(cert_auth.password));
545 free(cert_auth.password);
546 cert_auth.password = NULL;
547 }
548 ssl_cert_password_required = 0;
549 }
550
551 struct active_request_slot *get_active_slot(void)
552 {
553 struct active_request_slot *slot = active_queue_head;
554 struct active_request_slot *newslot;
555
556 #ifdef USE_CURL_MULTI
557 int num_transfers;
558
559 /* Wait for a slot to open up if the queue is full */
560 while (active_requests >= max_requests) {
561 curl_multi_perform(curlm, &num_transfers);
562 if (num_transfers < active_requests)
563 process_curl_messages();
564 }
565 #endif
566
567 while (slot != NULL && slot->in_use)
568 slot = slot->next;
569
570 if (slot == NULL) {
571 newslot = xmalloc(sizeof(*newslot));
572 newslot->curl = NULL;
573 newslot->in_use = 0;
574 newslot->next = NULL;
575
576 slot = active_queue_head;
577 if (slot == NULL) {
578 active_queue_head = newslot;
579 } else {
580 while (slot->next != NULL)
581 slot = slot->next;
582 slot->next = newslot;
583 }
584 slot = newslot;
585 }
586
587 if (slot->curl == NULL) {
588 #ifdef NO_CURL_EASY_DUPHANDLE
589 slot->curl = get_curl_handle();
590 #else
591 slot->curl = curl_easy_duphandle(curl_default);
592 #endif
593 curl_session_count++;
594 }
595
596 active_requests++;
597 slot->in_use = 1;
598 slot->results = NULL;
599 slot->finished = NULL;
600 slot->callback_data = NULL;
601 slot->callback_func = NULL;
602 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
603 if (curl_save_cookies)
604 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
605 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
606 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
607 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
608 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
609 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
610 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
611 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
612 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
613 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
614 if (http_auth.password)
615 init_curl_http_auth(slot->curl);
616
617 return slot;
618 }
619
620 int start_active_slot(struct active_request_slot *slot)
621 {
622 #ifdef USE_CURL_MULTI
623 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
624 int num_transfers;
625
626 if (curlm_result != CURLM_OK &&
627 curlm_result != CURLM_CALL_MULTI_PERFORM) {
628 active_requests--;
629 slot->in_use = 0;
630 return 0;
631 }
632
633 /*
634 * We know there must be something to do, since we just added
635 * something.
636 */
637 curl_multi_perform(curlm, &num_transfers);
638 #endif
639 return 1;
640 }
641
642 #ifdef USE_CURL_MULTI
643 struct fill_chain {
644 void *data;
645 int (*fill)(void *);
646 struct fill_chain *next;
647 };
648
649 static struct fill_chain *fill_cfg;
650
651 void add_fill_function(void *data, int (*fill)(void *))
652 {
653 struct fill_chain *new = xmalloc(sizeof(*new));
654 struct fill_chain **linkp = &fill_cfg;
655 new->data = data;
656 new->fill = fill;
657 new->next = NULL;
658 while (*linkp)
659 linkp = &(*linkp)->next;
660 *linkp = new;
661 }
662
663 void fill_active_slots(void)
664 {
665 struct active_request_slot *slot = active_queue_head;
666
667 while (active_requests < max_requests) {
668 struct fill_chain *fill;
669 for (fill = fill_cfg; fill; fill = fill->next)
670 if (fill->fill(fill->data))
671 break;
672
673 if (!fill)
674 break;
675 }
676
677 while (slot != NULL) {
678 if (!slot->in_use && slot->curl != NULL
679 && curl_session_count > min_curl_sessions) {
680 curl_easy_cleanup(slot->curl);
681 slot->curl = NULL;
682 curl_session_count--;
683 }
684 slot = slot->next;
685 }
686 }
687
688 void step_active_slots(void)
689 {
690 int num_transfers;
691 CURLMcode curlm_result;
692
693 do {
694 curlm_result = curl_multi_perform(curlm, &num_transfers);
695 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
696 if (num_transfers < active_requests) {
697 process_curl_messages();
698 fill_active_slots();
699 }
700 }
701 #endif
702
703 void run_active_slot(struct active_request_slot *slot)
704 {
705 #ifdef USE_CURL_MULTI
706 fd_set readfds;
707 fd_set writefds;
708 fd_set excfds;
709 int max_fd;
710 struct timeval select_timeout;
711 int finished = 0;
712
713 slot->finished = &finished;
714 while (!finished) {
715 step_active_slots();
716
717 if (slot->in_use) {
718 #if LIBCURL_VERSION_NUM >= 0x070f04
719 long curl_timeout;
720 curl_multi_timeout(curlm, &curl_timeout);
721 if (curl_timeout == 0) {
722 continue;
723 } else if (curl_timeout == -1) {
724 select_timeout.tv_sec = 0;
725 select_timeout.tv_usec = 50000;
726 } else {
727 select_timeout.tv_sec = curl_timeout / 1000;
728 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
729 }
730 #else
731 select_timeout.tv_sec = 0;
732 select_timeout.tv_usec = 50000;
733 #endif
734
735 max_fd = -1;
736 FD_ZERO(&readfds);
737 FD_ZERO(&writefds);
738 FD_ZERO(&excfds);
739 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
740
741 /*
742 * It can happen that curl_multi_timeout returns a pathologically
743 * long timeout when curl_multi_fdset returns no file descriptors
744 * to read. See commit message for more details.
745 */
746 if (max_fd < 0 &&
747 (select_timeout.tv_sec > 0 ||
748 select_timeout.tv_usec > 50000)) {
749 select_timeout.tv_sec = 0;
750 select_timeout.tv_usec = 50000;
751 }
752
753 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
754 }
755 }
756 #else
757 while (slot->in_use) {
758 slot->curl_result = curl_easy_perform(slot->curl);
759 finish_active_slot(slot);
760 }
761 #endif
762 }
763
764 static void release_active_slot(struct active_request_slot *slot)
765 {
766 closedown_active_slot(slot);
767 if (slot->curl && curl_session_count > min_curl_sessions) {
768 #ifdef USE_CURL_MULTI
769 curl_multi_remove_handle(curlm, slot->curl);
770 #endif
771 curl_easy_cleanup(slot->curl);
772 slot->curl = NULL;
773 curl_session_count--;
774 }
775 #ifdef USE_CURL_MULTI
776 fill_active_slots();
777 #endif
778 }
779
780 void finish_all_active_slots(void)
781 {
782 struct active_request_slot *slot = active_queue_head;
783
784 while (slot != NULL)
785 if (slot->in_use) {
786 run_active_slot(slot);
787 slot = active_queue_head;
788 } else {
789 slot = slot->next;
790 }
791 }
792
793 /* Helpers for modifying and creating URLs */
794 static inline int needs_quote(int ch)
795 {
796 if (((ch >= 'A') && (ch <= 'Z'))
797 || ((ch >= 'a') && (ch <= 'z'))
798 || ((ch >= '0') && (ch <= '9'))
799 || (ch == '/')
800 || (ch == '-')
801 || (ch == '.'))
802 return 0;
803 return 1;
804 }
805
806 static char *quote_ref_url(const char *base, const char *ref)
807 {
808 struct strbuf buf = STRBUF_INIT;
809 const char *cp;
810 int ch;
811
812 end_url_with_slash(&buf, base);
813
814 for (cp = ref; (ch = *cp) != 0; cp++)
815 if (needs_quote(ch))
816 strbuf_addf(&buf, "%%%02x", ch);
817 else
818 strbuf_addch(&buf, *cp);
819
820 return strbuf_detach(&buf, NULL);
821 }
822
823 void append_remote_object_url(struct strbuf *buf, const char *url,
824 const char *hex,
825 int only_two_digit_prefix)
826 {
827 end_url_with_slash(buf, url);
828
829 strbuf_addf(buf, "objects/%.*s/", 2, hex);
830 if (!only_two_digit_prefix)
831 strbuf_addf(buf, "%s", hex+2);
832 }
833
834 char *get_remote_object_url(const char *url, const char *hex,
835 int only_two_digit_prefix)
836 {
837 struct strbuf buf = STRBUF_INIT;
838 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
839 return strbuf_detach(&buf, NULL);
840 }
841
842 static int handle_curl_result(struct slot_results *results)
843 {
844 /*
845 * If we see a failing http code with CURLE_OK, we have turned off
846 * FAILONERROR (to keep the server's custom error response), and should
847 * translate the code into failure here.
848 */
849 if (results->curl_result == CURLE_OK &&
850 results->http_code >= 400) {
851 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
852 /*
853 * Normally curl will already have put the "reason phrase"
854 * from the server into curl_errorstr; unfortunately without
855 * FAILONERROR it is lost, so we can give only the numeric
856 * status code.
857 */
858 snprintf(curl_errorstr, sizeof(curl_errorstr),
859 "The requested URL returned error: %ld",
860 results->http_code);
861 }
862
863 if (results->curl_result == CURLE_OK) {
864 credential_approve(&http_auth);
865 return HTTP_OK;
866 } else if (missing_target(results))
867 return HTTP_MISSING_TARGET;
868 else if (results->http_code == 401) {
869 if (http_auth.username && http_auth.password) {
870 credential_reject(&http_auth);
871 return HTTP_NOAUTH;
872 } else {
873 return HTTP_REAUTH;
874 }
875 } else {
876 #if LIBCURL_VERSION_NUM >= 0x070c00
877 if (!curl_errorstr[0])
878 strlcpy(curl_errorstr,
879 curl_easy_strerror(results->curl_result),
880 sizeof(curl_errorstr));
881 #endif
882 return HTTP_ERROR;
883 }
884 }
885
886 int run_one_slot(struct active_request_slot *slot,
887 struct slot_results *results)
888 {
889 slot->results = results;
890 if (!start_active_slot(slot)) {
891 snprintf(curl_errorstr, sizeof(curl_errorstr),
892 "failed to start HTTP request");
893 return HTTP_START_FAILED;
894 }
895
896 run_active_slot(slot);
897 return handle_curl_result(results);
898 }
899
900 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
901 {
902 char *ptr;
903 CURLcode ret;
904
905 strbuf_reset(buf);
906 ret = curl_easy_getinfo(curl, info, &ptr);
907 if (!ret && ptr)
908 strbuf_addstr(buf, ptr);
909 return ret;
910 }
911
912 /*
913 * Check for and extract a content-type parameter. "raw"
914 * should be positioned at the start of the potential
915 * parameter, with any whitespace already removed.
916 *
917 * "name" is the name of the parameter. The value is appended
918 * to "out".
919 */
920 static int extract_param(const char *raw, const char *name,
921 struct strbuf *out)
922 {
923 size_t len = strlen(name);
924
925 if (strncasecmp(raw, name, len))
926 return -1;
927 raw += len;
928
929 if (*raw != '=')
930 return -1;
931 raw++;
932
933 while (*raw && !isspace(*raw) && *raw != ';')
934 strbuf_addch(out, *raw++);
935 return 0;
936 }
937
938 /*
939 * Extract a normalized version of the content type, with any
940 * spaces suppressed, all letters lowercased, and no trailing ";"
941 * or parameters.
942 *
943 * Note that we will silently remove even invalid whitespace. For
944 * example, "text / plain" is specifically forbidden by RFC 2616,
945 * but "text/plain" is the only reasonable output, and this keeps
946 * our code simple.
947 *
948 * If the "charset" argument is not NULL, store the value of any
949 * charset parameter there.
950 *
951 * Example:
952 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
953 * "text / plain" -> "text/plain"
954 */
955 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
956 struct strbuf *charset)
957 {
958 const char *p;
959
960 strbuf_reset(type);
961 strbuf_grow(type, raw->len);
962 for (p = raw->buf; *p; p++) {
963 if (isspace(*p))
964 continue;
965 if (*p == ';') {
966 p++;
967 break;
968 }
969 strbuf_addch(type, tolower(*p));
970 }
971
972 if (!charset)
973 return;
974
975 strbuf_reset(charset);
976 while (*p) {
977 while (isspace(*p) || *p == ';')
978 p++;
979 if (!extract_param(p, "charset", charset))
980 return;
981 while (*p && !isspace(*p))
982 p++;
983 }
984
985 if (!charset->len && starts_with(type->buf, "text/"))
986 strbuf_addstr(charset, "ISO-8859-1");
987 }
988
989 /* http_request() targets */
990 #define HTTP_REQUEST_STRBUF 0
991 #define HTTP_REQUEST_FILE 1
992
993 static int http_request(const char *url,
994 void *result, int target,
995 const struct http_get_options *options)
996 {
997 struct active_request_slot *slot;
998 struct slot_results results;
999 struct curl_slist *headers = NULL;
1000 struct strbuf buf = STRBUF_INIT;
1001 int ret;
1002
1003 slot = get_active_slot();
1004 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1005
1006 if (result == NULL) {
1007 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1008 } else {
1009 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1010 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1011
1012 if (target == HTTP_REQUEST_FILE) {
1013 long posn = ftell(result);
1014 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1015 fwrite);
1016 if (posn > 0) {
1017 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1018 headers = curl_slist_append(headers, buf.buf);
1019 strbuf_reset(&buf);
1020 }
1021 } else
1022 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1023 fwrite_buffer);
1024 }
1025
1026 strbuf_addstr(&buf, "Pragma:");
1027 if (options && options->no_cache)
1028 strbuf_addstr(&buf, " no-cache");
1029 if (options && options->keep_error)
1030 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1031
1032 headers = curl_slist_append(headers, buf.buf);
1033
1034 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1035 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1036 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1037
1038 ret = run_one_slot(slot, &results);
1039
1040 if (options && options->content_type) {
1041 struct strbuf raw = STRBUF_INIT;
1042 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1043 extract_content_type(&raw, options->content_type,
1044 options->charset);
1045 strbuf_release(&raw);
1046 }
1047
1048 if (options && options->effective_url)
1049 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1050 options->effective_url);
1051
1052 curl_slist_free_all(headers);
1053 strbuf_release(&buf);
1054
1055 return ret;
1056 }
1057
1058 /*
1059 * Update the "base" url to a more appropriate value, as deduced by
1060 * redirects seen when requesting a URL starting with "url".
1061 *
1062 * The "asked" parameter is a URL that we asked curl to access, and must begin
1063 * with "base".
1064 *
1065 * The "got" parameter is the URL that curl reported to us as where we ended
1066 * up.
1067 *
1068 * Returns 1 if we updated the base url, 0 otherwise.
1069 *
1070 * Our basic strategy is to compare "base" and "asked" to find the bits
1071 * specific to our request. We then strip those bits off of "got" to yield the
1072 * new base. So for example, if our base is "http://example.com/foo.git",
1073 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1074 * with "https://other.example.com/foo.git/info/refs". We would want the
1075 * new URL to become "https://other.example.com/foo.git".
1076 *
1077 * Note that this assumes a sane redirect scheme. It's entirely possible
1078 * in the example above to end up at a URL that does not even end in
1079 * "info/refs". In such a case we simply punt, as there is not much we can
1080 * do (and such a scheme is unlikely to represent a real git repository,
1081 * which means we are likely about to abort anyway).
1082 */
1083 static int update_url_from_redirect(struct strbuf *base,
1084 const char *asked,
1085 const struct strbuf *got)
1086 {
1087 const char *tail;
1088 size_t tail_len;
1089
1090 if (!strcmp(asked, got->buf))
1091 return 0;
1092
1093 if (!skip_prefix(asked, base->buf, &tail))
1094 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1095 asked, base->buf);
1096
1097 tail_len = strlen(tail);
1098
1099 if (got->len < tail_len ||
1100 strcmp(tail, got->buf + got->len - tail_len))
1101 return 0; /* insane redirect scheme */
1102
1103 strbuf_reset(base);
1104 strbuf_add(base, got->buf, got->len - tail_len);
1105 return 1;
1106 }
1107
1108 static int http_request_reauth(const char *url,
1109 void *result, int target,
1110 struct http_get_options *options)
1111 {
1112 int ret = http_request(url, result, target, options);
1113
1114 if (options && options->effective_url && options->base_url) {
1115 if (update_url_from_redirect(options->base_url,
1116 url, options->effective_url)) {
1117 credential_from_url(&http_auth, options->base_url->buf);
1118 url = options->effective_url->buf;
1119 }
1120 }
1121
1122 if (ret != HTTP_REAUTH)
1123 return ret;
1124
1125 /*
1126 * If we are using KEEP_ERROR, the previous request may have
1127 * put cruft into our output stream; we should clear it out before
1128 * making our next request. We only know how to do this for
1129 * the strbuf case, but that is enough to satisfy current callers.
1130 */
1131 if (options && options->keep_error) {
1132 switch (target) {
1133 case HTTP_REQUEST_STRBUF:
1134 strbuf_reset(result);
1135 break;
1136 default:
1137 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1138 }
1139 }
1140
1141 credential_fill(&http_auth);
1142
1143 return http_request(url, result, target, options);
1144 }
1145
1146 int http_get_strbuf(const char *url,
1147 struct strbuf *result,
1148 struct http_get_options *options)
1149 {
1150 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1151 }
1152
1153 /*
1154 * Downloads a URL and stores the result in the given file.
1155 *
1156 * If a previous interrupted download is detected (i.e. a previous temporary
1157 * file is still around) the download is resumed.
1158 */
1159 static int http_get_file(const char *url, const char *filename,
1160 struct http_get_options *options)
1161 {
1162 int ret;
1163 struct strbuf tmpfile = STRBUF_INIT;
1164 FILE *result;
1165
1166 strbuf_addf(&tmpfile, "%s.temp", filename);
1167 result = fopen(tmpfile.buf, "a");
1168 if (!result) {
1169 error("Unable to open local file %s", tmpfile.buf);
1170 ret = HTTP_ERROR;
1171 goto cleanup;
1172 }
1173
1174 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1175 fclose(result);
1176
1177 if (ret == HTTP_OK && move_temp_to_file(tmpfile.buf, filename))
1178 ret = HTTP_ERROR;
1179 cleanup:
1180 strbuf_release(&tmpfile);
1181 return ret;
1182 }
1183
1184 int http_fetch_ref(const char *base, struct ref *ref)
1185 {
1186 struct http_get_options options = {0};
1187 char *url;
1188 struct strbuf buffer = STRBUF_INIT;
1189 int ret = -1;
1190
1191 options.no_cache = 1;
1192
1193 url = quote_ref_url(base, ref->name);
1194 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1195 strbuf_rtrim(&buffer);
1196 if (buffer.len == 40)
1197 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1198 else if (starts_with(buffer.buf, "ref: ")) {
1199 ref->symref = xstrdup(buffer.buf + 5);
1200 ret = 0;
1201 }
1202 }
1203
1204 strbuf_release(&buffer);
1205 free(url);
1206 return ret;
1207 }
1208
1209 /* Helpers for fetching packs */
1210 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1211 {
1212 char *url, *tmp;
1213 struct strbuf buf = STRBUF_INIT;
1214
1215 if (http_is_verbose)
1216 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1217
1218 end_url_with_slash(&buf, base_url);
1219 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1220 url = strbuf_detach(&buf, NULL);
1221
1222 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1223 tmp = strbuf_detach(&buf, NULL);
1224
1225 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1226 error("Unable to get pack index %s", url);
1227 free(tmp);
1228 tmp = NULL;
1229 }
1230
1231 free(url);
1232 return tmp;
1233 }
1234
1235 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1236 unsigned char *sha1, const char *base_url)
1237 {
1238 struct packed_git *new_pack;
1239 char *tmp_idx = NULL;
1240 int ret;
1241
1242 if (has_pack_index(sha1)) {
1243 new_pack = parse_pack_index(sha1, NULL);
1244 if (!new_pack)
1245 return -1; /* parse_pack_index() already issued error message */
1246 goto add_pack;
1247 }
1248
1249 tmp_idx = fetch_pack_index(sha1, base_url);
1250 if (!tmp_idx)
1251 return -1;
1252
1253 new_pack = parse_pack_index(sha1, tmp_idx);
1254 if (!new_pack) {
1255 unlink(tmp_idx);
1256 free(tmp_idx);
1257
1258 return -1; /* parse_pack_index() already issued error message */
1259 }
1260
1261 ret = verify_pack_index(new_pack);
1262 if (!ret) {
1263 close_pack_index(new_pack);
1264 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1265 }
1266 free(tmp_idx);
1267 if (ret)
1268 return -1;
1269
1270 add_pack:
1271 new_pack->next = *packs_head;
1272 *packs_head = new_pack;
1273 return 0;
1274 }
1275
1276 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1277 {
1278 struct http_get_options options = {0};
1279 int ret = 0, i = 0;
1280 char *url, *data;
1281 struct strbuf buf = STRBUF_INIT;
1282 unsigned char sha1[20];
1283
1284 end_url_with_slash(&buf, base_url);
1285 strbuf_addstr(&buf, "objects/info/packs");
1286 url = strbuf_detach(&buf, NULL);
1287
1288 options.no_cache = 1;
1289 ret = http_get_strbuf(url, &buf, &options);
1290 if (ret != HTTP_OK)
1291 goto cleanup;
1292
1293 data = buf.buf;
1294 while (i < buf.len) {
1295 switch (data[i]) {
1296 case 'P':
1297 i++;
1298 if (i + 52 <= buf.len &&
1299 starts_with(data + i, " pack-") &&
1300 starts_with(data + i + 46, ".pack\n")) {
1301 get_sha1_hex(data + i + 6, sha1);
1302 fetch_and_setup_pack_index(packs_head, sha1,
1303 base_url);
1304 i += 51;
1305 break;
1306 }
1307 default:
1308 while (i < buf.len && data[i] != '\n')
1309 i++;
1310 }
1311 i++;
1312 }
1313
1314 cleanup:
1315 free(url);
1316 return ret;
1317 }
1318
1319 void release_http_pack_request(struct http_pack_request *preq)
1320 {
1321 if (preq->packfile != NULL) {
1322 fclose(preq->packfile);
1323 preq->packfile = NULL;
1324 }
1325 if (preq->range_header != NULL) {
1326 curl_slist_free_all(preq->range_header);
1327 preq->range_header = NULL;
1328 }
1329 preq->slot = NULL;
1330 free(preq->url);
1331 }
1332
1333 int finish_http_pack_request(struct http_pack_request *preq)
1334 {
1335 struct packed_git **lst;
1336 struct packed_git *p = preq->target;
1337 char *tmp_idx;
1338 struct child_process ip = CHILD_PROCESS_INIT;
1339 const char *ip_argv[8];
1340
1341 close_pack_index(p);
1342
1343 fclose(preq->packfile);
1344 preq->packfile = NULL;
1345
1346 lst = preq->lst;
1347 while (*lst != p)
1348 lst = &((*lst)->next);
1349 *lst = (*lst)->next;
1350
1351 tmp_idx = xstrdup(preq->tmpfile);
1352 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1353 ".idx.temp");
1354
1355 ip_argv[0] = "index-pack";
1356 ip_argv[1] = "-o";
1357 ip_argv[2] = tmp_idx;
1358 ip_argv[3] = preq->tmpfile;
1359 ip_argv[4] = NULL;
1360
1361 ip.argv = ip_argv;
1362 ip.git_cmd = 1;
1363 ip.no_stdin = 1;
1364 ip.no_stdout = 1;
1365
1366 if (run_command(&ip)) {
1367 unlink(preq->tmpfile);
1368 unlink(tmp_idx);
1369 free(tmp_idx);
1370 return -1;
1371 }
1372
1373 unlink(sha1_pack_index_name(p->sha1));
1374
1375 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1376 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1377 free(tmp_idx);
1378 return -1;
1379 }
1380
1381 install_packed_git(p);
1382 free(tmp_idx);
1383 return 0;
1384 }
1385
1386 struct http_pack_request *new_http_pack_request(
1387 struct packed_git *target, const char *base_url)
1388 {
1389 long prev_posn = 0;
1390 char range[RANGE_HEADER_SIZE];
1391 struct strbuf buf = STRBUF_INIT;
1392 struct http_pack_request *preq;
1393
1394 preq = xcalloc(1, sizeof(*preq));
1395 preq->target = target;
1396
1397 end_url_with_slash(&buf, base_url);
1398 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1399 sha1_to_hex(target->sha1));
1400 preq->url = strbuf_detach(&buf, NULL);
1401
1402 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1403 sha1_pack_name(target->sha1));
1404 preq->packfile = fopen(preq->tmpfile, "a");
1405 if (!preq->packfile) {
1406 error("Unable to open local file %s for pack",
1407 preq->tmpfile);
1408 goto abort;
1409 }
1410
1411 preq->slot = get_active_slot();
1412 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1413 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1414 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1415 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1416 no_pragma_header);
1417
1418 /*
1419 * If there is data present from a previous transfer attempt,
1420 * resume where it left off
1421 */
1422 prev_posn = ftell(preq->packfile);
1423 if (prev_posn>0) {
1424 if (http_is_verbose)
1425 fprintf(stderr,
1426 "Resuming fetch of pack %s at byte %ld\n",
1427 sha1_to_hex(target->sha1), prev_posn);
1428 sprintf(range, "Range: bytes=%ld-", prev_posn);
1429 preq->range_header = curl_slist_append(NULL, range);
1430 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1431 preq->range_header);
1432 }
1433
1434 return preq;
1435
1436 abort:
1437 free(preq->url);
1438 free(preq);
1439 return NULL;
1440 }
1441
1442 /* Helpers for fetching objects (loose) */
1443 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1444 void *data)
1445 {
1446 unsigned char expn[4096];
1447 size_t size = eltsize * nmemb;
1448 int posn = 0;
1449 struct http_object_request *freq =
1450 (struct http_object_request *)data;
1451 do {
1452 ssize_t retval = xwrite(freq->localfile,
1453 (char *) ptr + posn, size - posn);
1454 if (retval < 0)
1455 return posn;
1456 posn += retval;
1457 } while (posn < size);
1458
1459 freq->stream.avail_in = size;
1460 freq->stream.next_in = (void *)ptr;
1461 do {
1462 freq->stream.next_out = expn;
1463 freq->stream.avail_out = sizeof(expn);
1464 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1465 git_SHA1_Update(&freq->c, expn,
1466 sizeof(expn) - freq->stream.avail_out);
1467 } while (freq->stream.avail_in && freq->zret == Z_OK);
1468 return size;
1469 }
1470
1471 struct http_object_request *new_http_object_request(const char *base_url,
1472 unsigned char *sha1)
1473 {
1474 char *hex = sha1_to_hex(sha1);
1475 const char *filename;
1476 char prevfile[PATH_MAX];
1477 int prevlocal;
1478 char prev_buf[PREV_BUF_SIZE];
1479 ssize_t prev_read = 0;
1480 long prev_posn = 0;
1481 char range[RANGE_HEADER_SIZE];
1482 struct curl_slist *range_header = NULL;
1483 struct http_object_request *freq;
1484
1485 freq = xcalloc(1, sizeof(*freq));
1486 hashcpy(freq->sha1, sha1);
1487 freq->localfile = -1;
1488
1489 filename = sha1_file_name(sha1);
1490 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1491 "%s.temp", filename);
1492
1493 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1494 unlink_or_warn(prevfile);
1495 rename(freq->tmpfile, prevfile);
1496 unlink_or_warn(freq->tmpfile);
1497
1498 if (freq->localfile != -1)
1499 error("fd leakage in start: %d", freq->localfile);
1500 freq->localfile = open(freq->tmpfile,
1501 O_WRONLY | O_CREAT | O_EXCL, 0666);
1502 /*
1503 * This could have failed due to the "lazy directory creation";
1504 * try to mkdir the last path component.
1505 */
1506 if (freq->localfile < 0 && errno == ENOENT) {
1507 char *dir = strrchr(freq->tmpfile, '/');
1508 if (dir) {
1509 *dir = 0;
1510 mkdir(freq->tmpfile, 0777);
1511 *dir = '/';
1512 }
1513 freq->localfile = open(freq->tmpfile,
1514 O_WRONLY | O_CREAT | O_EXCL, 0666);
1515 }
1516
1517 if (freq->localfile < 0) {
1518 error("Couldn't create temporary file %s: %s",
1519 freq->tmpfile, strerror(errno));
1520 goto abort;
1521 }
1522
1523 git_inflate_init(&freq->stream);
1524
1525 git_SHA1_Init(&freq->c);
1526
1527 freq->url = get_remote_object_url(base_url, hex, 0);
1528
1529 /*
1530 * If a previous temp file is present, process what was already
1531 * fetched.
1532 */
1533 prevlocal = open(prevfile, O_RDONLY);
1534 if (prevlocal != -1) {
1535 do {
1536 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1537 if (prev_read>0) {
1538 if (fwrite_sha1_file(prev_buf,
1539 1,
1540 prev_read,
1541 freq) == prev_read) {
1542 prev_posn += prev_read;
1543 } else {
1544 prev_read = -1;
1545 }
1546 }
1547 } while (prev_read > 0);
1548 close(prevlocal);
1549 }
1550 unlink_or_warn(prevfile);
1551
1552 /*
1553 * Reset inflate/SHA1 if there was an error reading the previous temp
1554 * file; also rewind to the beginning of the local file.
1555 */
1556 if (prev_read == -1) {
1557 memset(&freq->stream, 0, sizeof(freq->stream));
1558 git_inflate_init(&freq->stream);
1559 git_SHA1_Init(&freq->c);
1560 if (prev_posn>0) {
1561 prev_posn = 0;
1562 lseek(freq->localfile, 0, SEEK_SET);
1563 if (ftruncate(freq->localfile, 0) < 0) {
1564 error("Couldn't truncate temporary file %s: %s",
1565 freq->tmpfile, strerror(errno));
1566 goto abort;
1567 }
1568 }
1569 }
1570
1571 freq->slot = get_active_slot();
1572
1573 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1574 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1575 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1576 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1577 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1578
1579 /*
1580 * If we have successfully processed data from a previous fetch
1581 * attempt, only fetch the data we don't already have.
1582 */
1583 if (prev_posn>0) {
1584 if (http_is_verbose)
1585 fprintf(stderr,
1586 "Resuming fetch of object %s at byte %ld\n",
1587 hex, prev_posn);
1588 sprintf(range, "Range: bytes=%ld-", prev_posn);
1589 range_header = curl_slist_append(range_header, range);
1590 curl_easy_setopt(freq->slot->curl,
1591 CURLOPT_HTTPHEADER, range_header);
1592 }
1593
1594 return freq;
1595
1596 abort:
1597 free(freq->url);
1598 free(freq);
1599 return NULL;
1600 }
1601
1602 void process_http_object_request(struct http_object_request *freq)
1603 {
1604 if (freq->slot == NULL)
1605 return;
1606 freq->curl_result = freq->slot->curl_result;
1607 freq->http_code = freq->slot->http_code;
1608 freq->slot = NULL;
1609 }
1610
1611 int finish_http_object_request(struct http_object_request *freq)
1612 {
1613 struct stat st;
1614
1615 close(freq->localfile);
1616 freq->localfile = -1;
1617
1618 process_http_object_request(freq);
1619
1620 if (freq->http_code == 416) {
1621 warning("requested range invalid; we may already have all the data.");
1622 } else if (freq->curl_result != CURLE_OK) {
1623 if (stat(freq->tmpfile, &st) == 0)
1624 if (st.st_size == 0)
1625 unlink_or_warn(freq->tmpfile);
1626 return -1;
1627 }
1628
1629 git_inflate_end(&freq->stream);
1630 git_SHA1_Final(freq->real_sha1, &freq->c);
1631 if (freq->zret != Z_STREAM_END) {
1632 unlink_or_warn(freq->tmpfile);
1633 return -1;
1634 }
1635 if (hashcmp(freq->sha1, freq->real_sha1)) {
1636 unlink_or_warn(freq->tmpfile);
1637 return -1;
1638 }
1639 freq->rename =
1640 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1641
1642 return freq->rename;
1643 }
1644
1645 void abort_http_object_request(struct http_object_request *freq)
1646 {
1647 unlink_or_warn(freq->tmpfile);
1648
1649 release_http_object_request(freq);
1650 }
1651
1652 void release_http_object_request(struct http_object_request *freq)
1653 {
1654 if (freq->localfile != -1) {
1655 close(freq->localfile);
1656 freq->localfile = -1;
1657 }
1658 if (freq->url != NULL) {
1659 free(freq->url);
1660 freq->url = NULL;
1661 }
1662 if (freq->slot != NULL) {
1663 freq->slot->callback_func = NULL;
1664 freq->slot->callback_data = NULL;
1665 release_active_slot(freq->slot);
1666 freq->slot = NULL;
1667 }
1668 }
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