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http: clean up leak in init_curl_http_auth
[git.git] / http.c
blobeaf7f40d134d83309d0b0e464dd60eec4dae50dd
1 #include "http.h"
2 #include "pack.h"
3 #include "sideband.h"
4 #include "run-command.h"
5 #include "url.h"
6 #include "credential.h"
7
8 int active_requests;
9 int http_is_verbose;
10 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
11
12 #if LIBCURL_VERSION_NUM >= 0x070a06
13 #define LIBCURL_CAN_HANDLE_AUTH_ANY
14 #endif
15
16 static int min_curl_sessions = 1;
17 static int curl_session_count;
18 #ifdef USE_CURL_MULTI
19 static int max_requests = -1;
20 static CURLM *curlm;
21 #endif
22 #ifndef NO_CURL_EASY_DUPHANDLE
23 static CURL *curl_default;
24 #endif
25
26 #define PREV_BUF_SIZE 4096
27 #define RANGE_HEADER_SIZE 30
28
29 char curl_errorstr[CURL_ERROR_SIZE];
30
31 static int curl_ssl_verify = -1;
32 static const char *ssl_cert;
33 #if LIBCURL_VERSION_NUM >= 0x070903
34 static const char *ssl_key;
35 #endif
36 #if LIBCURL_VERSION_NUM >= 0x070908
37 static const char *ssl_capath;
38 #endif
39 static const char *ssl_cainfo;
40 static long curl_low_speed_limit = -1;
41 static long curl_low_speed_time = -1;
42 static int curl_ftp_no_epsv;
43 static const char *curl_http_proxy;
44 static const char *curl_cookie_file;
45 static struct credential http_auth = CREDENTIAL_INIT;
46 static int http_proactive_auth;
47 static const char *user_agent;
48
49 #if LIBCURL_VERSION_NUM >= 0x071700
50 /* Use CURLOPT_KEYPASSWD as is */
51 #elif LIBCURL_VERSION_NUM >= 0x070903
52 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
53 #else
54 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
55 #endif
56
57 static struct credential cert_auth = CREDENTIAL_INIT;
58 static int ssl_cert_password_required;
59
60 static struct curl_slist *pragma_header;
61 static struct curl_slist *no_pragma_header;
62
63 static struct active_request_slot *active_queue_head;
64
65 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
66 {
67 size_t size = eltsize * nmemb;
68 struct buffer *buffer = buffer_;
69
70 if (size > buffer->buf.len - buffer->posn)
71 size = buffer->buf.len - buffer->posn;
72 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
73 buffer->posn += size;
74
75 return size;
76 }
77
78 #ifndef NO_CURL_IOCTL
79 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
80 {
81 struct buffer *buffer = clientp;
82
83 switch (cmd) {
84 case CURLIOCMD_NOP:
85 return CURLIOE_OK;
86
87 case CURLIOCMD_RESTARTREAD:
88 buffer->posn = 0;
89 return CURLIOE_OK;
90
91 default:
92 return CURLIOE_UNKNOWNCMD;
93 }
94 }
95 #endif
96
97 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
98 {
99 size_t size = eltsize * nmemb;
100 struct strbuf *buffer = buffer_;
101
102 strbuf_add(buffer, ptr, size);
103 return size;
104 }
105
106 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
107 {
108 return eltsize * nmemb;
109 }
110
111 #ifdef USE_CURL_MULTI
112 static void process_curl_messages(void)
113 {
114 int num_messages;
115 struct active_request_slot *slot;
116 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
117
118 while (curl_message != NULL) {
119 if (curl_message->msg == CURLMSG_DONE) {
120 int curl_result = curl_message->data.result;
121 slot = active_queue_head;
122 while (slot != NULL &&
123 slot->curl != curl_message->easy_handle)
124 slot = slot->next;
125 if (slot != NULL) {
126 curl_multi_remove_handle(curlm, slot->curl);
127 slot->curl_result = curl_result;
128 finish_active_slot(slot);
129 } else {
130 fprintf(stderr, "Received DONE message for unknown request!\n");
131 }
132 } else {
133 fprintf(stderr, "Unknown CURL message received: %d\n",
134 (int)curl_message->msg);
135 }
136 curl_message = curl_multi_info_read(curlm, &num_messages);
137 }
138 }
139 #endif
140
141 static int http_options(const char *var, const char *value, void *cb)
142 {
143 if (!strcmp("http.sslverify", var)) {
144 curl_ssl_verify = git_config_bool(var, value);
145 return 0;
146 }
147 if (!strcmp("http.sslcert", var))
148 return git_config_string(&ssl_cert, var, value);
149 #if LIBCURL_VERSION_NUM >= 0x070903
150 if (!strcmp("http.sslkey", var))
151 return git_config_string(&ssl_key, var, value);
152 #endif
153 #if LIBCURL_VERSION_NUM >= 0x070908
154 if (!strcmp("http.sslcapath", var))
155 return git_config_string(&ssl_capath, var, value);
156 #endif
157 if (!strcmp("http.sslcainfo", var))
158 return git_config_string(&ssl_cainfo, var, value);
159 if (!strcmp("http.sslcertpasswordprotected", var)) {
160 if (git_config_bool(var, value))
161 ssl_cert_password_required = 1;
162 return 0;
163 }
164 if (!strcmp("http.minsessions", var)) {
165 min_curl_sessions = git_config_int(var, value);
166 #ifndef USE_CURL_MULTI
167 if (min_curl_sessions > 1)
168 min_curl_sessions = 1;
169 #endif
170 return 0;
171 }
172 #ifdef USE_CURL_MULTI
173 if (!strcmp("http.maxrequests", var)) {
174 max_requests = git_config_int(var, value);
175 return 0;
176 }
177 #endif
178 if (!strcmp("http.lowspeedlimit", var)) {
179 curl_low_speed_limit = (long)git_config_int(var, value);
180 return 0;
181 }
182 if (!strcmp("http.lowspeedtime", var)) {
183 curl_low_speed_time = (long)git_config_int(var, value);
184 return 0;
185 }
186
187 if (!strcmp("http.noepsv", var)) {
188 curl_ftp_no_epsv = git_config_bool(var, value);
189 return 0;
190 }
191 if (!strcmp("http.proxy", var))
192 return git_config_string(&curl_http_proxy, var, value);
193
194 if (!strcmp("http.cookiefile", var))
195 return git_config_string(&curl_cookie_file, var, value);
196
197 if (!strcmp("http.postbuffer", var)) {
198 http_post_buffer = git_config_int(var, value);
199 if (http_post_buffer < LARGE_PACKET_MAX)
200 http_post_buffer = LARGE_PACKET_MAX;
201 return 0;
202 }
203
204 if (!strcmp("http.useragent", var))
205 return git_config_string(&user_agent, var, value);
206
207 /* Fall back on the default ones */
208 return git_default_config(var, value, cb);
209 }
210
211 static void init_curl_http_auth(CURL *result)
212 {
213 if (http_auth.username) {
214 static struct strbuf up = STRBUF_INIT;
215 credential_fill(&http_auth);
216 strbuf_reset(&up);
217 strbuf_addf(&up, "%s:%s",
218 http_auth.username, http_auth.password);
219 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
220 }
221 }
222
223 static int has_cert_password(void)
224 {
225 if (ssl_cert == NULL || ssl_cert_password_required != 1)
226 return 0;
227 if (!cert_auth.password) {
228 cert_auth.protocol = xstrdup("cert");
229 cert_auth.path = xstrdup(ssl_cert);
230 credential_fill(&cert_auth);
231 }
232 return 1;
233 }
234
235 static CURL *get_curl_handle(void)
236 {
237 CURL *result = curl_easy_init();
238
239 if (!curl_ssl_verify) {
240 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
241 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
242 } else {
243 /* Verify authenticity of the peer's certificate */
244 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
245 /* The name in the cert must match whom we tried to connect */
246 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
247 }
248
249 #if LIBCURL_VERSION_NUM >= 0x070907
250 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
251 #endif
252 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
253 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
254 #endif
255
256 if (http_proactive_auth)
257 init_curl_http_auth(result);
258
259 if (ssl_cert != NULL)
260 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
261 if (has_cert_password())
262 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
263 #if LIBCURL_VERSION_NUM >= 0x070903
264 if (ssl_key != NULL)
265 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
266 #endif
267 #if LIBCURL_VERSION_NUM >= 0x070908
268 if (ssl_capath != NULL)
269 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
270 #endif
271 if (ssl_cainfo != NULL)
272 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
273 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
274
275 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
276 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
277 curl_low_speed_limit);
278 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
279 curl_low_speed_time);
280 }
281
282 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
283 #if LIBCURL_VERSION_NUM >= 0x071301
284 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
285 #elif LIBCURL_VERSION_NUM >= 0x071101
286 curl_easy_setopt(result, CURLOPT_POST301, 1);
287 #endif
288
289 if (getenv("GIT_CURL_VERBOSE"))
290 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
291
292 curl_easy_setopt(result, CURLOPT_USERAGENT,
293 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
294
295 if (curl_ftp_no_epsv)
296 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
297
298 if (curl_http_proxy) {
299 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
300 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
301 }
302
303 return result;
304 }
305
306 static void set_from_env(const char **var, const char *envname)
307 {
308 const char *val = getenv(envname);
309 if (val)
310 *var = val;
311 }
312
313 void http_init(struct remote *remote, const char *url, int proactive_auth)
314 {
315 char *low_speed_limit;
316 char *low_speed_time;
317
318 http_is_verbose = 0;
319
320 git_config(http_options, NULL);
321
322 curl_global_init(CURL_GLOBAL_ALL);
323
324 http_proactive_auth = proactive_auth;
325
326 if (remote && remote->http_proxy)
327 curl_http_proxy = xstrdup(remote->http_proxy);
328
329 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
330 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
331
332 #ifdef USE_CURL_MULTI
333 {
334 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
335 if (http_max_requests != NULL)
336 max_requests = atoi(http_max_requests);
337 }
338
339 curlm = curl_multi_init();
340 if (curlm == NULL) {
341 fprintf(stderr, "Error creating curl multi handle.\n");
342 exit(1);
343 }
344 #endif
345
346 if (getenv("GIT_SSL_NO_VERIFY"))
347 curl_ssl_verify = 0;
348
349 set_from_env(&ssl_cert, "GIT_SSL_CERT");
350 #if LIBCURL_VERSION_NUM >= 0x070903
351 set_from_env(&ssl_key, "GIT_SSL_KEY");
352 #endif
353 #if LIBCURL_VERSION_NUM >= 0x070908
354 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
355 #endif
356 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
357
358 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
359
360 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
361 if (low_speed_limit != NULL)
362 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
363 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
364 if (low_speed_time != NULL)
365 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
366
367 if (curl_ssl_verify == -1)
368 curl_ssl_verify = 1;
369
370 curl_session_count = 0;
371 #ifdef USE_CURL_MULTI
372 if (max_requests < 1)
373 max_requests = DEFAULT_MAX_REQUESTS;
374 #endif
375
376 if (getenv("GIT_CURL_FTP_NO_EPSV"))
377 curl_ftp_no_epsv = 1;
378
379 if (url) {
380 credential_from_url(&http_auth, url);
381 if (!ssl_cert_password_required &&
382 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
383 !prefixcmp(url, "https://"))
384 ssl_cert_password_required = 1;
385 }
386
387 #ifndef NO_CURL_EASY_DUPHANDLE
388 curl_default = get_curl_handle();
389 #endif
390 }
391
392 void http_cleanup(void)
393 {
394 struct active_request_slot *slot = active_queue_head;
395
396 while (slot != NULL) {
397 struct active_request_slot *next = slot->next;
398 if (slot->curl != NULL) {
399 #ifdef USE_CURL_MULTI
400 curl_multi_remove_handle(curlm, slot->curl);
401 #endif
402 curl_easy_cleanup(slot->curl);
403 }
404 free(slot);
405 slot = next;
406 }
407 active_queue_head = NULL;
408
409 #ifndef NO_CURL_EASY_DUPHANDLE
410 curl_easy_cleanup(curl_default);
411 #endif
412
413 #ifdef USE_CURL_MULTI
414 curl_multi_cleanup(curlm);
415 #endif
416 curl_global_cleanup();
417
418 curl_slist_free_all(pragma_header);
419 pragma_header = NULL;
420
421 curl_slist_free_all(no_pragma_header);
422 no_pragma_header = NULL;
423
424 if (curl_http_proxy) {
425 free((void *)curl_http_proxy);
426 curl_http_proxy = NULL;
427 }
428
429 if (cert_auth.password != NULL) {
430 memset(cert_auth.password, 0, strlen(cert_auth.password));
431 free(cert_auth.password);
432 cert_auth.password = NULL;
433 }
434 ssl_cert_password_required = 0;
435 }
436
437 struct active_request_slot *get_active_slot(void)
438 {
439 struct active_request_slot *slot = active_queue_head;
440 struct active_request_slot *newslot;
441
442 #ifdef USE_CURL_MULTI
443 int num_transfers;
444
445 /* Wait for a slot to open up if the queue is full */
446 while (active_requests >= max_requests) {
447 curl_multi_perform(curlm, &num_transfers);
448 if (num_transfers < active_requests)
449 process_curl_messages();
450 }
451 #endif
452
453 while (slot != NULL && slot->in_use)
454 slot = slot->next;
455
456 if (slot == NULL) {
457 newslot = xmalloc(sizeof(*newslot));
458 newslot->curl = NULL;
459 newslot->in_use = 0;
460 newslot->next = NULL;
461
462 slot = active_queue_head;
463 if (slot == NULL) {
464 active_queue_head = newslot;
465 } else {
466 while (slot->next != NULL)
467 slot = slot->next;
468 slot->next = newslot;
469 }
470 slot = newslot;
471 }
472
473 if (slot->curl == NULL) {
474 #ifdef NO_CURL_EASY_DUPHANDLE
475 slot->curl = get_curl_handle();
476 #else
477 slot->curl = curl_easy_duphandle(curl_default);
478 #endif
479 curl_session_count++;
480 }
481
482 active_requests++;
483 slot->in_use = 1;
484 slot->results = NULL;
485 slot->finished = NULL;
486 slot->callback_data = NULL;
487 slot->callback_func = NULL;
488 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
489 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
490 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
491 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
492 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
493 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
494 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
495 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
496 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
497 if (http_auth.password)
498 init_curl_http_auth(slot->curl);
499
500 return slot;
501 }
502
503 int start_active_slot(struct active_request_slot *slot)
504 {
505 #ifdef USE_CURL_MULTI
506 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
507 int num_transfers;
508
509 if (curlm_result != CURLM_OK &&
510 curlm_result != CURLM_CALL_MULTI_PERFORM) {
511 active_requests--;
512 slot->in_use = 0;
513 return 0;
514 }
515
516 /*
517 * We know there must be something to do, since we just added
518 * something.
519 */
520 curl_multi_perform(curlm, &num_transfers);
521 #endif
522 return 1;
523 }
524
525 #ifdef USE_CURL_MULTI
526 struct fill_chain {
527 void *data;
528 int (*fill)(void *);
529 struct fill_chain *next;
530 };
531
532 static struct fill_chain *fill_cfg;
533
534 void add_fill_function(void *data, int (*fill)(void *))
535 {
536 struct fill_chain *new = xmalloc(sizeof(*new));
537 struct fill_chain **linkp = &fill_cfg;
538 new->data = data;
539 new->fill = fill;
540 new->next = NULL;
541 while (*linkp)
542 linkp = &(*linkp)->next;
543 *linkp = new;
544 }
545
546 void fill_active_slots(void)
547 {
548 struct active_request_slot *slot = active_queue_head;
549
550 while (active_requests < max_requests) {
551 struct fill_chain *fill;
552 for (fill = fill_cfg; fill; fill = fill->next)
553 if (fill->fill(fill->data))
554 break;
555
556 if (!fill)
557 break;
558 }
559
560 while (slot != NULL) {
561 if (!slot->in_use && slot->curl != NULL
562 && curl_session_count > min_curl_sessions) {
563 curl_easy_cleanup(slot->curl);
564 slot->curl = NULL;
565 curl_session_count--;
566 }
567 slot = slot->next;
568 }
569 }
570
571 void step_active_slots(void)
572 {
573 int num_transfers;
574 CURLMcode curlm_result;
575
576 do {
577 curlm_result = curl_multi_perform(curlm, &num_transfers);
578 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
579 if (num_transfers < active_requests) {
580 process_curl_messages();
581 fill_active_slots();
582 }
583 }
584 #endif
585
586 void run_active_slot(struct active_request_slot *slot)
587 {
588 #ifdef USE_CURL_MULTI
589 fd_set readfds;
590 fd_set writefds;
591 fd_set excfds;
592 int max_fd;
593 struct timeval select_timeout;
594 int finished = 0;
595
596 slot->finished = &finished;
597 while (!finished) {
598 step_active_slots();
599
600 if (slot->in_use) {
601 #if LIBCURL_VERSION_NUM >= 0x070f04
602 long curl_timeout;
603 curl_multi_timeout(curlm, &curl_timeout);
604 if (curl_timeout == 0) {
605 continue;
606 } else if (curl_timeout == -1) {
607 select_timeout.tv_sec = 0;
608 select_timeout.tv_usec = 50000;
609 } else {
610 select_timeout.tv_sec = curl_timeout / 1000;
611 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
612 }
613 #else
614 select_timeout.tv_sec = 0;
615 select_timeout.tv_usec = 50000;
616 #endif
617
618 max_fd = -1;
619 FD_ZERO(&readfds);
620 FD_ZERO(&writefds);
621 FD_ZERO(&excfds);
622 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
623
624 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
625 }
626 }
627 #else
628 while (slot->in_use) {
629 slot->curl_result = curl_easy_perform(slot->curl);
630 finish_active_slot(slot);
631 }
632 #endif
633 }
634
635 static void closedown_active_slot(struct active_request_slot *slot)
636 {
637 active_requests--;
638 slot->in_use = 0;
639 }
640
641 static void release_active_slot(struct active_request_slot *slot)
642 {
643 closedown_active_slot(slot);
644 if (slot->curl && curl_session_count > min_curl_sessions) {
645 #ifdef USE_CURL_MULTI
646 curl_multi_remove_handle(curlm, slot->curl);
647 #endif
648 curl_easy_cleanup(slot->curl);
649 slot->curl = NULL;
650 curl_session_count--;
651 }
652 #ifdef USE_CURL_MULTI
653 fill_active_slots();
654 #endif
655 }
656
657 void finish_active_slot(struct active_request_slot *slot)
658 {
659 closedown_active_slot(slot);
660 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
661
662 if (slot->finished != NULL)
663 (*slot->finished) = 1;
664
665 /* Store slot results so they can be read after the slot is reused */
666 if (slot->results != NULL) {
667 slot->results->curl_result = slot->curl_result;
668 slot->results->http_code = slot->http_code;
669 }
670
671 /* Run callback if appropriate */
672 if (slot->callback_func != NULL)
673 slot->callback_func(slot->callback_data);
674 }
675
676 void finish_all_active_slots(void)
677 {
678 struct active_request_slot *slot = active_queue_head;
679
680 while (slot != NULL)
681 if (slot->in_use) {
682 run_active_slot(slot);
683 slot = active_queue_head;
684 } else {
685 slot = slot->next;
686 }
687 }
688
689 /* Helpers for modifying and creating URLs */
690 static inline int needs_quote(int ch)
691 {
692 if (((ch >= 'A') && (ch <= 'Z'))
693 || ((ch >= 'a') && (ch <= 'z'))
694 || ((ch >= '0') && (ch <= '9'))
695 || (ch == '/')
696 || (ch == '-')
697 || (ch == '.'))
698 return 0;
699 return 1;
700 }
701
702 static char *quote_ref_url(const char *base, const char *ref)
703 {
704 struct strbuf buf = STRBUF_INIT;
705 const char *cp;
706 int ch;
707
708 end_url_with_slash(&buf, base);
709
710 for (cp = ref; (ch = *cp) != 0; cp++)
711 if (needs_quote(ch))
712 strbuf_addf(&buf, "%%%02x", ch);
713 else
714 strbuf_addch(&buf, *cp);
715
716 return strbuf_detach(&buf, NULL);
717 }
718
719 void append_remote_object_url(struct strbuf *buf, const char *url,
720 const char *hex,
721 int only_two_digit_prefix)
722 {
723 end_url_with_slash(buf, url);
724
725 strbuf_addf(buf, "objects/%.*s/", 2, hex);
726 if (!only_two_digit_prefix)
727 strbuf_addf(buf, "%s", hex+2);
728 }
729
730 char *get_remote_object_url(const char *url, const char *hex,
731 int only_two_digit_prefix)
732 {
733 struct strbuf buf = STRBUF_INIT;
734 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
735 return strbuf_detach(&buf, NULL);
736 }
737
738 /* http_request() targets */
739 #define HTTP_REQUEST_STRBUF 0
740 #define HTTP_REQUEST_FILE 1
741
742 static int http_request(const char *url, void *result, int target, int options)
743 {
744 struct active_request_slot *slot;
745 struct slot_results results;
746 struct curl_slist *headers = NULL;
747 struct strbuf buf = STRBUF_INIT;
748 int ret;
749
750 slot = get_active_slot();
751 slot->results = &results;
752 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
753
754 if (result == NULL) {
755 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
756 } else {
757 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
758 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
759
760 if (target == HTTP_REQUEST_FILE) {
761 long posn = ftell(result);
762 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
763 fwrite);
764 if (posn > 0) {
765 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
766 headers = curl_slist_append(headers, buf.buf);
767 strbuf_reset(&buf);
768 }
769 } else
770 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
771 fwrite_buffer);
772 }
773
774 strbuf_addstr(&buf, "Pragma:");
775 if (options & HTTP_NO_CACHE)
776 strbuf_addstr(&buf, " no-cache");
777
778 headers = curl_slist_append(headers, buf.buf);
779
780 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
781 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
782
783 if (start_active_slot(slot)) {
784 run_active_slot(slot);
785 if (results.curl_result == CURLE_OK)
786 ret = HTTP_OK;
787 else if (missing_target(&results))
788 ret = HTTP_MISSING_TARGET;
789 else if (results.http_code == 401) {
790 if (http_auth.username && http_auth.password) {
791 credential_reject(&http_auth);
792 ret = HTTP_NOAUTH;
793 } else {
794 credential_fill(&http_auth);
795 init_curl_http_auth(slot->curl);
796 ret = HTTP_REAUTH;
797 }
798 } else {
799 if (!curl_errorstr[0])
800 strlcpy(curl_errorstr,
801 curl_easy_strerror(results.curl_result),
802 sizeof(curl_errorstr));
803 ret = HTTP_ERROR;
804 }
805 } else {
806 error("Unable to start HTTP request for %s", url);
807 ret = HTTP_START_FAILED;
808 }
809
810 curl_slist_free_all(headers);
811 strbuf_release(&buf);
812
813 if (ret == HTTP_OK)
814 credential_approve(&http_auth);
815
816 return ret;
817 }
818
819 static int http_request_reauth(const char *url, void *result, int target,
820 int options)
821 {
822 int ret = http_request(url, result, target, options);
823 if (ret != HTTP_REAUTH)
824 return ret;
825 return http_request(url, result, target, options);
826 }
827
828 int http_get_strbuf(const char *url, struct strbuf *result, int options)
829 {
830 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
831 }
832
833 /*
834 * Downloads a URL and stores the result in the given file.
835 *
836 * If a previous interrupted download is detected (i.e. a previous temporary
837 * file is still around) the download is resumed.
838 */
839 static int http_get_file(const char *url, const char *filename, int options)
840 {
841 int ret;
842 struct strbuf tmpfile = STRBUF_INIT;
843 FILE *result;
844
845 strbuf_addf(&tmpfile, "%s.temp", filename);
846 result = fopen(tmpfile.buf, "a");
847 if (! result) {
848 error("Unable to open local file %s", tmpfile.buf);
849 ret = HTTP_ERROR;
850 goto cleanup;
851 }
852
853 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
854 fclose(result);
855
856 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
857 ret = HTTP_ERROR;
858 cleanup:
859 strbuf_release(&tmpfile);
860 return ret;
861 }
862
863 int http_error(const char *url, int ret)
864 {
865 /* http_request has already handled HTTP_START_FAILED. */
866 if (ret != HTTP_START_FAILED)
867 error("%s while accessing %s", curl_errorstr, url);
868
869 return ret;
870 }
871
872 int http_fetch_ref(const char *base, struct ref *ref)
873 {
874 char *url;
875 struct strbuf buffer = STRBUF_INIT;
876 int ret = -1;
877
878 url = quote_ref_url(base, ref->name);
879 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
880 strbuf_rtrim(&buffer);
881 if (buffer.len == 40)
882 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
883 else if (!prefixcmp(buffer.buf, "ref: ")) {
884 ref->symref = xstrdup(buffer.buf + 5);
885 ret = 0;
886 }
887 }
888
889 strbuf_release(&buffer);
890 free(url);
891 return ret;
892 }
893
894 /* Helpers for fetching packs */
895 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
896 {
897 char *url, *tmp;
898 struct strbuf buf = STRBUF_INIT;
899
900 if (http_is_verbose)
901 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
902
903 end_url_with_slash(&buf, base_url);
904 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
905 url = strbuf_detach(&buf, NULL);
906
907 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
908 tmp = strbuf_detach(&buf, NULL);
909
910 if (http_get_file(url, tmp, 0) != HTTP_OK) {
911 error("Unable to get pack index %s\n", url);
912 free(tmp);
913 tmp = NULL;
914 }
915
916 free(url);
917 return tmp;
918 }
919
920 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
921 unsigned char *sha1, const char *base_url)
922 {
923 struct packed_git *new_pack;
924 char *tmp_idx = NULL;
925 int ret;
926
927 if (has_pack_index(sha1)) {
928 new_pack = parse_pack_index(sha1, NULL);
929 if (!new_pack)
930 return -1; /* parse_pack_index() already issued error message */
931 goto add_pack;
932 }
933
934 tmp_idx = fetch_pack_index(sha1, base_url);
935 if (!tmp_idx)
936 return -1;
937
938 new_pack = parse_pack_index(sha1, tmp_idx);
939 if (!new_pack) {
940 unlink(tmp_idx);
941 free(tmp_idx);
942
943 return -1; /* parse_pack_index() already issued error message */
944 }
945
946 ret = verify_pack_index(new_pack);
947 if (!ret) {
948 close_pack_index(new_pack);
949 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
950 }
951 free(tmp_idx);
952 if (ret)
953 return -1;
954
955 add_pack:
956 new_pack->next = *packs_head;
957 *packs_head = new_pack;
958 return 0;
959 }
960
961 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
962 {
963 int ret = 0, i = 0;
964 char *url, *data;
965 struct strbuf buf = STRBUF_INIT;
966 unsigned char sha1[20];
967
968 end_url_with_slash(&buf, base_url);
969 strbuf_addstr(&buf, "objects/info/packs");
970 url = strbuf_detach(&buf, NULL);
971
972 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
973 if (ret != HTTP_OK)
974 goto cleanup;
975
976 data = buf.buf;
977 while (i < buf.len) {
978 switch (data[i]) {
979 case 'P':
980 i++;
981 if (i + 52 <= buf.len &&
982 !prefixcmp(data + i, " pack-") &&
983 !prefixcmp(data + i + 46, ".pack\n")) {
984 get_sha1_hex(data + i + 6, sha1);
985 fetch_and_setup_pack_index(packs_head, sha1,
986 base_url);
987 i += 51;
988 break;
989 }
990 default:
991 while (i < buf.len && data[i] != '\n')
992 i++;
993 }
994 i++;
995 }
996
997 cleanup:
998 free(url);
999 return ret;
1000 }
1001
1002 void release_http_pack_request(struct http_pack_request *preq)
1003 {
1004 if (preq->packfile != NULL) {
1005 fclose(preq->packfile);
1006 preq->packfile = NULL;
1007 }
1008 if (preq->range_header != NULL) {
1009 curl_slist_free_all(preq->range_header);
1010 preq->range_header = NULL;
1011 }
1012 preq->slot = NULL;
1013 free(preq->url);
1014 }
1015
1016 int finish_http_pack_request(struct http_pack_request *preq)
1017 {
1018 struct packed_git **lst;
1019 struct packed_git *p = preq->target;
1020 char *tmp_idx;
1021 struct child_process ip;
1022 const char *ip_argv[8];
1023
1024 close_pack_index(p);
1025
1026 fclose(preq->packfile);
1027 preq->packfile = NULL;
1028
1029 lst = preq->lst;
1030 while (*lst != p)
1031 lst = &((*lst)->next);
1032 *lst = (*lst)->next;
1033
1034 tmp_idx = xstrdup(preq->tmpfile);
1035 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1036 ".idx.temp");
1037
1038 ip_argv[0] = "index-pack";
1039 ip_argv[1] = "-o";
1040 ip_argv[2] = tmp_idx;
1041 ip_argv[3] = preq->tmpfile;
1042 ip_argv[4] = NULL;
1043
1044 memset(&ip, 0, sizeof(ip));
1045 ip.argv = ip_argv;
1046 ip.git_cmd = 1;
1047 ip.no_stdin = 1;
1048 ip.no_stdout = 1;
1049
1050 if (run_command(&ip)) {
1051 unlink(preq->tmpfile);
1052 unlink(tmp_idx);
1053 free(tmp_idx);
1054 return -1;
1055 }
1056
1057 unlink(sha1_pack_index_name(p->sha1));
1058
1059 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1060 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1061 free(tmp_idx);
1062 return -1;
1063 }
1064
1065 install_packed_git(p);
1066 free(tmp_idx);
1067 return 0;
1068 }
1069
1070 struct http_pack_request *new_http_pack_request(
1071 struct packed_git *target, const char *base_url)
1072 {
1073 long prev_posn = 0;
1074 char range[RANGE_HEADER_SIZE];
1075 struct strbuf buf = STRBUF_INIT;
1076 struct http_pack_request *preq;
1077
1078 preq = xcalloc(1, sizeof(*preq));
1079 preq->target = target;
1080
1081 end_url_with_slash(&buf, base_url);
1082 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1083 sha1_to_hex(target->sha1));
1084 preq->url = strbuf_detach(&buf, NULL);
1085
1086 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1087 sha1_pack_name(target->sha1));
1088 preq->packfile = fopen(preq->tmpfile, "a");
1089 if (!preq->packfile) {
1090 error("Unable to open local file %s for pack",
1091 preq->tmpfile);
1092 goto abort;
1093 }
1094
1095 preq->slot = get_active_slot();
1096 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1097 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1098 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1099 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1100 no_pragma_header);
1101
1102 /*
1103 * If there is data present from a previous transfer attempt,
1104 * resume where it left off
1105 */
1106 prev_posn = ftell(preq->packfile);
1107 if (prev_posn>0) {
1108 if (http_is_verbose)
1109 fprintf(stderr,
1110 "Resuming fetch of pack %s at byte %ld\n",
1111 sha1_to_hex(target->sha1), prev_posn);
1112 sprintf(range, "Range: bytes=%ld-", prev_posn);
1113 preq->range_header = curl_slist_append(NULL, range);
1114 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1115 preq->range_header);
1116 }
1117
1118 return preq;
1119
1120 abort:
1121 free(preq->url);
1122 free(preq);
1123 return NULL;
1124 }
1125
1126 /* Helpers for fetching objects (loose) */
1127 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1128 void *data)
1129 {
1130 unsigned char expn[4096];
1131 size_t size = eltsize * nmemb;
1132 int posn = 0;
1133 struct http_object_request *freq =
1134 (struct http_object_request *)data;
1135 do {
1136 ssize_t retval = xwrite(freq->localfile,
1137 (char *) ptr + posn, size - posn);
1138 if (retval < 0)
1139 return posn;
1140 posn += retval;
1141 } while (posn < size);
1142
1143 freq->stream.avail_in = size;
1144 freq->stream.next_in = (void *)ptr;
1145 do {
1146 freq->stream.next_out = expn;
1147 freq->stream.avail_out = sizeof(expn);
1148 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1149 git_SHA1_Update(&freq->c, expn,
1150 sizeof(expn) - freq->stream.avail_out);
1151 } while (freq->stream.avail_in && freq->zret == Z_OK);
1152 return size;
1153 }
1154
1155 struct http_object_request *new_http_object_request(const char *base_url,
1156 unsigned char *sha1)
1157 {
1158 char *hex = sha1_to_hex(sha1);
1159 char *filename;
1160 char prevfile[PATH_MAX];
1161 int prevlocal;
1162 char prev_buf[PREV_BUF_SIZE];
1163 ssize_t prev_read = 0;
1164 long prev_posn = 0;
1165 char range[RANGE_HEADER_SIZE];
1166 struct curl_slist *range_header = NULL;
1167 struct http_object_request *freq;
1168
1169 freq = xcalloc(1, sizeof(*freq));
1170 hashcpy(freq->sha1, sha1);
1171 freq->localfile = -1;
1172
1173 filename = sha1_file_name(sha1);
1174 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1175 "%s.temp", filename);
1176
1177 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1178 unlink_or_warn(prevfile);
1179 rename(freq->tmpfile, prevfile);
1180 unlink_or_warn(freq->tmpfile);
1181
1182 if (freq->localfile != -1)
1183 error("fd leakage in start: %d", freq->localfile);
1184 freq->localfile = open(freq->tmpfile,
1185 O_WRONLY | O_CREAT | O_EXCL, 0666);
1186 /*
1187 * This could have failed due to the "lazy directory creation";
1188 * try to mkdir the last path component.
1189 */
1190 if (freq->localfile < 0 && errno == ENOENT) {
1191 char *dir = strrchr(freq->tmpfile, '/');
1192 if (dir) {
1193 *dir = 0;
1194 mkdir(freq->tmpfile, 0777);
1195 *dir = '/';
1196 }
1197 freq->localfile = open(freq->tmpfile,
1198 O_WRONLY | O_CREAT | O_EXCL, 0666);
1199 }
1200
1201 if (freq->localfile < 0) {
1202 error("Couldn't create temporary file %s: %s",
1203 freq->tmpfile, strerror(errno));
1204 goto abort;
1205 }
1206
1207 git_inflate_init(&freq->stream);
1208
1209 git_SHA1_Init(&freq->c);
1210
1211 freq->url = get_remote_object_url(base_url, hex, 0);
1212
1213 /*
1214 * If a previous temp file is present, process what was already
1215 * fetched.
1216 */
1217 prevlocal = open(prevfile, O_RDONLY);
1218 if (prevlocal != -1) {
1219 do {
1220 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1221 if (prev_read>0) {
1222 if (fwrite_sha1_file(prev_buf,
1223 1,
1224 prev_read,
1225 freq) == prev_read) {
1226 prev_posn += prev_read;
1227 } else {
1228 prev_read = -1;
1229 }
1230 }
1231 } while (prev_read > 0);
1232 close(prevlocal);
1233 }
1234 unlink_or_warn(prevfile);
1235
1236 /*
1237 * Reset inflate/SHA1 if there was an error reading the previous temp
1238 * file; also rewind to the beginning of the local file.
1239 */
1240 if (prev_read == -1) {
1241 memset(&freq->stream, 0, sizeof(freq->stream));
1242 git_inflate_init(&freq->stream);
1243 git_SHA1_Init(&freq->c);
1244 if (prev_posn>0) {
1245 prev_posn = 0;
1246 lseek(freq->localfile, 0, SEEK_SET);
1247 if (ftruncate(freq->localfile, 0) < 0) {
1248 error("Couldn't truncate temporary file %s: %s",
1249 freq->tmpfile, strerror(errno));
1250 goto abort;
1251 }
1252 }
1253 }
1254
1255 freq->slot = get_active_slot();
1256
1257 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1258 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1259 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1260 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1261 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1262
1263 /*
1264 * If we have successfully processed data from a previous fetch
1265 * attempt, only fetch the data we don't already have.
1266 */
1267 if (prev_posn>0) {
1268 if (http_is_verbose)
1269 fprintf(stderr,
1270 "Resuming fetch of object %s at byte %ld\n",
1271 hex, prev_posn);
1272 sprintf(range, "Range: bytes=%ld-", prev_posn);
1273 range_header = curl_slist_append(range_header, range);
1274 curl_easy_setopt(freq->slot->curl,
1275 CURLOPT_HTTPHEADER, range_header);
1276 }
1277
1278 return freq;
1279
1280 abort:
1281 free(freq->url);
1282 free(freq);
1283 return NULL;
1284 }
1285
1286 void process_http_object_request(struct http_object_request *freq)
1287 {
1288 if (freq->slot == NULL)
1289 return;
1290 freq->curl_result = freq->slot->curl_result;
1291 freq->http_code = freq->slot->http_code;
1292 freq->slot = NULL;
1293 }
1294
1295 int finish_http_object_request(struct http_object_request *freq)
1296 {
1297 struct stat st;
1298
1299 close(freq->localfile);
1300 freq->localfile = -1;
1301
1302 process_http_object_request(freq);
1303
1304 if (freq->http_code == 416) {
1305 warning("requested range invalid; we may already have all the data.");
1306 } else if (freq->curl_result != CURLE_OK) {
1307 if (stat(freq->tmpfile, &st) == 0)
1308 if (st.st_size == 0)
1309 unlink_or_warn(freq->tmpfile);
1310 return -1;
1311 }
1312
1313 git_inflate_end(&freq->stream);
1314 git_SHA1_Final(freq->real_sha1, &freq->c);
1315 if (freq->zret != Z_STREAM_END) {
1316 unlink_or_warn(freq->tmpfile);
1317 return -1;
1318 }
1319 if (hashcmp(freq->sha1, freq->real_sha1)) {
1320 unlink_or_warn(freq->tmpfile);
1321 return -1;
1322 }
1323 freq->rename =
1324 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1325
1326 return freq->rename;
1327 }
1328
1329 void abort_http_object_request(struct http_object_request *freq)
1330 {
1331 unlink_or_warn(freq->tmpfile);
1332
1333 release_http_object_request(freq);
1334 }
1335
1336 void release_http_object_request(struct http_object_request *freq)
1337 {
1338 if (freq->localfile != -1) {
1339 close(freq->localfile);
1340 freq->localfile = -1;
1341 }
1342 if (freq->url != NULL) {
1343 free(freq->url);
1344 freq->url = NULL;
1345 }
1346 if (freq->slot != NULL) {
1347 freq->slot->callback_func = NULL;
1348 freq->slot->callback_data = NULL;
1349 release_active_slot(freq->slot);
1350 freq->slot = NULL;
1351 }
1352 }
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