?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
http.c: Avoid username prompt for certifcate credentials
[git/jnareb-git.git] / http.c
blob0b32cc6a29ed82b56b67c44d7b464a902c5bba86
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 #include "version.h"
8
9 int active_requests;
10 int http_is_verbose;
11 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
12
13 #if LIBCURL_VERSION_NUM >= 0x070a06
14 #define LIBCURL_CAN_HANDLE_AUTH_ANY
15 #endif
16
17 static int min_curl_sessions = 1;
18 static int curl_session_count;
19 #ifdef USE_CURL_MULTI
20 static int max_requests = -1;
21 static CURLM *curlm;
22 #endif
23 #ifndef NO_CURL_EASY_DUPHANDLE
24 static CURL *curl_default;
25 #endif
26
27 #define PREV_BUF_SIZE 4096
28 #define RANGE_HEADER_SIZE 30
29
30 char curl_errorstr[CURL_ERROR_SIZE];
31
32 static int curl_ssl_verify = -1;
33 static const char *ssl_cert;
34 #if LIBCURL_VERSION_NUM >= 0x070903
35 static const char *ssl_key;
36 #endif
37 #if LIBCURL_VERSION_NUM >= 0x070908
38 static const char *ssl_capath;
39 #endif
40 static const char *ssl_cainfo;
41 static long curl_low_speed_limit = -1;
42 static long curl_low_speed_time = -1;
43 static int curl_ftp_no_epsv;
44 static const char *curl_http_proxy;
45 static const char *curl_cookie_file;
46 static struct credential http_auth = CREDENTIAL_INIT;
47 static int http_proactive_auth;
48 static const char *user_agent;
49
50 #if LIBCURL_VERSION_NUM >= 0x071700
51 /* Use CURLOPT_KEYPASSWD as is */
52 #elif LIBCURL_VERSION_NUM >= 0x070903
53 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
54 #else
55 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
56 #endif
57
58 static struct credential cert_auth = CREDENTIAL_INIT;
59 static int ssl_cert_password_required;
60
61 static struct curl_slist *pragma_header;
62 static struct curl_slist *no_pragma_header;
63
64 static struct active_request_slot *active_queue_head;
65
66 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
67 {
68 size_t size = eltsize * nmemb;
69 struct buffer *buffer = buffer_;
70
71 if (size > buffer->buf.len - buffer->posn)
72 size = buffer->buf.len - buffer->posn;
73 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
74 buffer->posn += size;
75
76 return size;
77 }
78
79 #ifndef NO_CURL_IOCTL
80 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
81 {
82 struct buffer *buffer = clientp;
83
84 switch (cmd) {
85 case CURLIOCMD_NOP:
86 return CURLIOE_OK;
87
88 case CURLIOCMD_RESTARTREAD:
89 buffer->posn = 0;
90 return CURLIOE_OK;
91
92 default:
93 return CURLIOE_UNKNOWNCMD;
94 }
95 }
96 #endif
97
98 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
99 {
100 size_t size = eltsize * nmemb;
101 struct strbuf *buffer = buffer_;
102
103 strbuf_add(buffer, ptr, size);
104 return size;
105 }
106
107 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
108 {
109 return eltsize * nmemb;
110 }
111
112 #ifdef USE_CURL_MULTI
113 static void process_curl_messages(void)
114 {
115 int num_messages;
116 struct active_request_slot *slot;
117 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
118
119 while (curl_message != NULL) {
120 if (curl_message->msg == CURLMSG_DONE) {
121 int curl_result = curl_message->data.result;
122 slot = active_queue_head;
123 while (slot != NULL &&
124 slot->curl != curl_message->easy_handle)
125 slot = slot->next;
126 if (slot != NULL) {
127 curl_multi_remove_handle(curlm, slot->curl);
128 slot->curl_result = curl_result;
129 finish_active_slot(slot);
130 } else {
131 fprintf(stderr, "Received DONE message for unknown request!\n");
132 }
133 } else {
134 fprintf(stderr, "Unknown CURL message received: %d\n",
135 (int)curl_message->msg);
136 }
137 curl_message = curl_multi_info_read(curlm, &num_messages);
138 }
139 }
140 #endif
141
142 static int http_options(const char *var, const char *value, void *cb)
143 {
144 if (!strcmp("http.sslverify", var)) {
145 curl_ssl_verify = git_config_bool(var, value);
146 return 0;
147 }
148 if (!strcmp("http.sslcert", var))
149 return git_config_string(&ssl_cert, var, value);
150 #if LIBCURL_VERSION_NUM >= 0x070903
151 if (!strcmp("http.sslkey", var))
152 return git_config_string(&ssl_key, var, value);
153 #endif
154 #if LIBCURL_VERSION_NUM >= 0x070908
155 if (!strcmp("http.sslcapath", var))
156 return git_config_string(&ssl_capath, var, value);
157 #endif
158 if (!strcmp("http.sslcainfo", var))
159 return git_config_string(&ssl_cainfo, var, value);
160 if (!strcmp("http.sslcertpasswordprotected", var)) {
161 if (git_config_bool(var, value))
162 ssl_cert_password_required = 1;
163 return 0;
164 }
165 if (!strcmp("http.minsessions", var)) {
166 min_curl_sessions = git_config_int(var, value);
167 #ifndef USE_CURL_MULTI
168 if (min_curl_sessions > 1)
169 min_curl_sessions = 1;
170 #endif
171 return 0;
172 }
173 #ifdef USE_CURL_MULTI
174 if (!strcmp("http.maxrequests", var)) {
175 max_requests = git_config_int(var, value);
176 return 0;
177 }
178 #endif
179 if (!strcmp("http.lowspeedlimit", var)) {
180 curl_low_speed_limit = (long)git_config_int(var, value);
181 return 0;
182 }
183 if (!strcmp("http.lowspeedtime", var)) {
184 curl_low_speed_time = (long)git_config_int(var, value);
185 return 0;
186 }
187
188 if (!strcmp("http.noepsv", var)) {
189 curl_ftp_no_epsv = git_config_bool(var, value);
190 return 0;
191 }
192 if (!strcmp("http.proxy", var))
193 return git_config_string(&curl_http_proxy, var, value);
194
195 if (!strcmp("http.cookiefile", var))
196 return git_config_string(&curl_cookie_file, var, value);
197
198 if (!strcmp("http.postbuffer", var)) {
199 http_post_buffer = git_config_int(var, value);
200 if (http_post_buffer < LARGE_PACKET_MAX)
201 http_post_buffer = LARGE_PACKET_MAX;
202 return 0;
203 }
204
205 if (!strcmp("http.useragent", var))
206 return git_config_string(&user_agent, var, value);
207
208 /* Fall back on the default ones */
209 return git_default_config(var, value, cb);
210 }
211
212 static void init_curl_http_auth(CURL *result)
213 {
214 if (!http_auth.username)
215 return;
216
217 credential_fill(&http_auth);
218
219 #if LIBCURL_VERSION_NUM >= 0x071301
220 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
221 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
222 #else
223 {
224 static struct strbuf up = STRBUF_INIT;
225 strbuf_reset(&up);
226 strbuf_addf(&up, "%s:%s",
227 http_auth.username, http_auth.password);
228 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
229 }
230 #endif
231 }
232
233 static int has_cert_password(void)
234 {
235 if (ssl_cert == NULL || ssl_cert_password_required != 1)
236 return 0;
237 if (!cert_auth.password) {
238 cert_auth.protocol = xstrdup("cert");
239 cert_auth.username = xstrdup("");
240 cert_auth.path = xstrdup(ssl_cert);
241 credential_fill(&cert_auth);
242 }
243 return 1;
244 }
245
246 static CURL *get_curl_handle(void)
247 {
248 CURL *result = curl_easy_init();
249
250 if (!curl_ssl_verify) {
251 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
252 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
253 } else {
254 /* Verify authenticity of the peer's certificate */
255 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
256 /* The name in the cert must match whom we tried to connect */
257 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
258 }
259
260 #if LIBCURL_VERSION_NUM >= 0x070907
261 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
262 #endif
263 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
264 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
265 #endif
266
267 if (http_proactive_auth)
268 init_curl_http_auth(result);
269
270 if (ssl_cert != NULL)
271 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
272 if (has_cert_password())
273 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
274 #if LIBCURL_VERSION_NUM >= 0x070903
275 if (ssl_key != NULL)
276 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
277 #endif
278 #if LIBCURL_VERSION_NUM >= 0x070908
279 if (ssl_capath != NULL)
280 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
281 #endif
282 if (ssl_cainfo != NULL)
283 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
284 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
285
286 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
287 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
288 curl_low_speed_limit);
289 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
290 curl_low_speed_time);
291 }
292
293 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
294 #if LIBCURL_VERSION_NUM >= 0x071301
295 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
296 #elif LIBCURL_VERSION_NUM >= 0x071101
297 curl_easy_setopt(result, CURLOPT_POST301, 1);
298 #endif
299
300 if (getenv("GIT_CURL_VERBOSE"))
301 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
302
303 curl_easy_setopt(result, CURLOPT_USERAGENT,
304 user_agent ? user_agent : git_user_agent());
305
306 if (curl_ftp_no_epsv)
307 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
308
309 if (curl_http_proxy) {
310 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
311 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
312 }
313
314 return result;
315 }
316
317 static void set_from_env(const char **var, const char *envname)
318 {
319 const char *val = getenv(envname);
320 if (val)
321 *var = val;
322 }
323
324 void http_init(struct remote *remote, const char *url, int proactive_auth)
325 {
326 char *low_speed_limit;
327 char *low_speed_time;
328
329 http_is_verbose = 0;
330
331 git_config(http_options, NULL);
332
333 curl_global_init(CURL_GLOBAL_ALL);
334
335 http_proactive_auth = proactive_auth;
336
337 if (remote && remote->http_proxy)
338 curl_http_proxy = xstrdup(remote->http_proxy);
339
340 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
341 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
342
343 #ifdef USE_CURL_MULTI
344 {
345 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
346 if (http_max_requests != NULL)
347 max_requests = atoi(http_max_requests);
348 }
349
350 curlm = curl_multi_init();
351 if (curlm == NULL) {
352 fprintf(stderr, "Error creating curl multi handle.\n");
353 exit(1);
354 }
355 #endif
356
357 if (getenv("GIT_SSL_NO_VERIFY"))
358 curl_ssl_verify = 0;
359
360 set_from_env(&ssl_cert, "GIT_SSL_CERT");
361 #if LIBCURL_VERSION_NUM >= 0x070903
362 set_from_env(&ssl_key, "GIT_SSL_KEY");
363 #endif
364 #if LIBCURL_VERSION_NUM >= 0x070908
365 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
366 #endif
367 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
368
369 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
370
371 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
372 if (low_speed_limit != NULL)
373 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
374 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
375 if (low_speed_time != NULL)
376 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
377
378 if (curl_ssl_verify == -1)
379 curl_ssl_verify = 1;
380
381 curl_session_count = 0;
382 #ifdef USE_CURL_MULTI
383 if (max_requests < 1)
384 max_requests = DEFAULT_MAX_REQUESTS;
385 #endif
386
387 if (getenv("GIT_CURL_FTP_NO_EPSV"))
388 curl_ftp_no_epsv = 1;
389
390 if (url) {
391 credential_from_url(&http_auth, url);
392 if (!ssl_cert_password_required &&
393 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
394 !prefixcmp(url, "https://"))
395 ssl_cert_password_required = 1;
396 }
397
398 #ifndef NO_CURL_EASY_DUPHANDLE
399 curl_default = get_curl_handle();
400 #endif
401 }
402
403 void http_cleanup(void)
404 {
405 struct active_request_slot *slot = active_queue_head;
406
407 while (slot != NULL) {
408 struct active_request_slot *next = slot->next;
409 if (slot->curl != NULL) {
410 #ifdef USE_CURL_MULTI
411 curl_multi_remove_handle(curlm, slot->curl);
412 #endif
413 curl_easy_cleanup(slot->curl);
414 }
415 free(slot);
416 slot = next;
417 }
418 active_queue_head = NULL;
419
420 #ifndef NO_CURL_EASY_DUPHANDLE
421 curl_easy_cleanup(curl_default);
422 #endif
423
424 #ifdef USE_CURL_MULTI
425 curl_multi_cleanup(curlm);
426 #endif
427 curl_global_cleanup();
428
429 curl_slist_free_all(pragma_header);
430 pragma_header = NULL;
431
432 curl_slist_free_all(no_pragma_header);
433 no_pragma_header = NULL;
434
435 if (curl_http_proxy) {
436 free((void *)curl_http_proxy);
437 curl_http_proxy = NULL;
438 }
439
440 if (cert_auth.password != NULL) {
441 memset(cert_auth.password, 0, strlen(cert_auth.password));
442 free(cert_auth.password);
443 cert_auth.password = NULL;
444 }
445 ssl_cert_password_required = 0;
446 }
447
448 struct active_request_slot *get_active_slot(void)
449 {
450 struct active_request_slot *slot = active_queue_head;
451 struct active_request_slot *newslot;
452
453 #ifdef USE_CURL_MULTI
454 int num_transfers;
455
456 /* Wait for a slot to open up if the queue is full */
457 while (active_requests >= max_requests) {
458 curl_multi_perform(curlm, &num_transfers);
459 if (num_transfers < active_requests)
460 process_curl_messages();
461 }
462 #endif
463
464 while (slot != NULL && slot->in_use)
465 slot = slot->next;
466
467 if (slot == NULL) {
468 newslot = xmalloc(sizeof(*newslot));
469 newslot->curl = NULL;
470 newslot->in_use = 0;
471 newslot->next = NULL;
472
473 slot = active_queue_head;
474 if (slot == NULL) {
475 active_queue_head = newslot;
476 } else {
477 while (slot->next != NULL)
478 slot = slot->next;
479 slot->next = newslot;
480 }
481 slot = newslot;
482 }
483
484 if (slot->curl == NULL) {
485 #ifdef NO_CURL_EASY_DUPHANDLE
486 slot->curl = get_curl_handle();
487 #else
488 slot->curl = curl_easy_duphandle(curl_default);
489 #endif
490 curl_session_count++;
491 }
492
493 active_requests++;
494 slot->in_use = 1;
495 slot->results = NULL;
496 slot->finished = NULL;
497 slot->callback_data = NULL;
498 slot->callback_func = NULL;
499 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
500 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
501 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
502 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
503 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
504 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
505 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
506 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
507 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
508 if (http_auth.password)
509 init_curl_http_auth(slot->curl);
510
511 return slot;
512 }
513
514 int start_active_slot(struct active_request_slot *slot)
515 {
516 #ifdef USE_CURL_MULTI
517 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
518 int num_transfers;
519
520 if (curlm_result != CURLM_OK &&
521 curlm_result != CURLM_CALL_MULTI_PERFORM) {
522 active_requests--;
523 slot->in_use = 0;
524 return 0;
525 }
526
527 /*
528 * We know there must be something to do, since we just added
529 * something.
530 */
531 curl_multi_perform(curlm, &num_transfers);
532 #endif
533 return 1;
534 }
535
536 #ifdef USE_CURL_MULTI
537 struct fill_chain {
538 void *data;
539 int (*fill)(void *);
540 struct fill_chain *next;
541 };
542
543 static struct fill_chain *fill_cfg;
544
545 void add_fill_function(void *data, int (*fill)(void *))
546 {
547 struct fill_chain *new = xmalloc(sizeof(*new));
548 struct fill_chain **linkp = &fill_cfg;
549 new->data = data;
550 new->fill = fill;
551 new->next = NULL;
552 while (*linkp)
553 linkp = &(*linkp)->next;
554 *linkp = new;
555 }
556
557 void fill_active_slots(void)
558 {
559 struct active_request_slot *slot = active_queue_head;
560
561 while (active_requests < max_requests) {
562 struct fill_chain *fill;
563 for (fill = fill_cfg; fill; fill = fill->next)
564 if (fill->fill(fill->data))
565 break;
566
567 if (!fill)
568 break;
569 }
570
571 while (slot != NULL) {
572 if (!slot->in_use && slot->curl != NULL
573 && curl_session_count > min_curl_sessions) {
574 curl_easy_cleanup(slot->curl);
575 slot->curl = NULL;
576 curl_session_count--;
577 }
578 slot = slot->next;
579 }
580 }
581
582 void step_active_slots(void)
583 {
584 int num_transfers;
585 CURLMcode curlm_result;
586
587 do {
588 curlm_result = curl_multi_perform(curlm, &num_transfers);
589 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
590 if (num_transfers < active_requests) {
591 process_curl_messages();
592 fill_active_slots();
593 }
594 }
595 #endif
596
597 void run_active_slot(struct active_request_slot *slot)
598 {
599 #ifdef USE_CURL_MULTI
600 fd_set readfds;
601 fd_set writefds;
602 fd_set excfds;
603 int max_fd;
604 struct timeval select_timeout;
605 int finished = 0;
606
607 slot->finished = &finished;
608 while (!finished) {
609 step_active_slots();
610
611 if (slot->in_use) {
612 #if LIBCURL_VERSION_NUM >= 0x070f04
613 long curl_timeout;
614 curl_multi_timeout(curlm, &curl_timeout);
615 if (curl_timeout == 0) {
616 continue;
617 } else if (curl_timeout == -1) {
618 select_timeout.tv_sec = 0;
619 select_timeout.tv_usec = 50000;
620 } else {
621 select_timeout.tv_sec = curl_timeout / 1000;
622 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
623 }
624 #else
625 select_timeout.tv_sec = 0;
626 select_timeout.tv_usec = 50000;
627 #endif
628
629 max_fd = -1;
630 FD_ZERO(&readfds);
631 FD_ZERO(&writefds);
632 FD_ZERO(&excfds);
633 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
634
635 /*
636 * It can happen that curl_multi_timeout returns a pathologically
637 * long timeout when curl_multi_fdset returns no file descriptors
638 * to read. See commit message for more details.
639 */
640 if (max_fd < 0 &&
641 (select_timeout.tv_sec > 0 ||
642 select_timeout.tv_usec > 50000)) {
643 select_timeout.tv_sec = 0;
644 select_timeout.tv_usec = 50000;
645 }
646
647 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
648 }
649 }
650 #else
651 while (slot->in_use) {
652 slot->curl_result = curl_easy_perform(slot->curl);
653 finish_active_slot(slot);
654 }
655 #endif
656 }
657
658 static void closedown_active_slot(struct active_request_slot *slot)
659 {
660 active_requests--;
661 slot->in_use = 0;
662 }
663
664 static void release_active_slot(struct active_request_slot *slot)
665 {
666 closedown_active_slot(slot);
667 if (slot->curl && curl_session_count > min_curl_sessions) {
668 #ifdef USE_CURL_MULTI
669 curl_multi_remove_handle(curlm, slot->curl);
670 #endif
671 curl_easy_cleanup(slot->curl);
672 slot->curl = NULL;
673 curl_session_count--;
674 }
675 #ifdef USE_CURL_MULTI
676 fill_active_slots();
677 #endif
678 }
679
680 void finish_active_slot(struct active_request_slot *slot)
681 {
682 closedown_active_slot(slot);
683 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
684
685 if (slot->finished != NULL)
686 (*slot->finished) = 1;
687
688 /* Store slot results so they can be read after the slot is reused */
689 if (slot->results != NULL) {
690 slot->results->curl_result = slot->curl_result;
691 slot->results->http_code = slot->http_code;
692 }
693
694 /* Run callback if appropriate */
695 if (slot->callback_func != NULL)
696 slot->callback_func(slot->callback_data);
697 }
698
699 void finish_all_active_slots(void)
700 {
701 struct active_request_slot *slot = active_queue_head;
702
703 while (slot != NULL)
704 if (slot->in_use) {
705 run_active_slot(slot);
706 slot = active_queue_head;
707 } else {
708 slot = slot->next;
709 }
710 }
711
712 /* Helpers for modifying and creating URLs */
713 static inline int needs_quote(int ch)
714 {
715 if (((ch >= 'A') && (ch <= 'Z'))
716 || ((ch >= 'a') && (ch <= 'z'))
717 || ((ch >= '0') && (ch <= '9'))
718 || (ch == '/')
719 || (ch == '-')
720 || (ch == '.'))
721 return 0;
722 return 1;
723 }
724
725 static char *quote_ref_url(const char *base, const char *ref)
726 {
727 struct strbuf buf = STRBUF_INIT;
728 const char *cp;
729 int ch;
730
731 end_url_with_slash(&buf, base);
732
733 for (cp = ref; (ch = *cp) != 0; cp++)
734 if (needs_quote(ch))
735 strbuf_addf(&buf, "%%%02x", ch);
736 else
737 strbuf_addch(&buf, *cp);
738
739 return strbuf_detach(&buf, NULL);
740 }
741
742 void append_remote_object_url(struct strbuf *buf, const char *url,
743 const char *hex,
744 int only_two_digit_prefix)
745 {
746 end_url_with_slash(buf, url);
747
748 strbuf_addf(buf, "objects/%.*s/", 2, hex);
749 if (!only_two_digit_prefix)
750 strbuf_addf(buf, "%s", hex+2);
751 }
752
753 char *get_remote_object_url(const char *url, const char *hex,
754 int only_two_digit_prefix)
755 {
756 struct strbuf buf = STRBUF_INIT;
757 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
758 return strbuf_detach(&buf, NULL);
759 }
760
761 int handle_curl_result(struct active_request_slot *slot,
762 struct slot_results *results)
763 {
764 if (results->curl_result == CURLE_OK) {
765 credential_approve(&http_auth);
766 return HTTP_OK;
767 } else if (missing_target(results))
768 return HTTP_MISSING_TARGET;
769 else if (results->http_code == 401) {
770 if (http_auth.username && http_auth.password) {
771 credential_reject(&http_auth);
772 return HTTP_NOAUTH;
773 } else {
774 credential_fill(&http_auth);
775 init_curl_http_auth(slot->curl);
776 return HTTP_REAUTH;
777 }
778 } else {
779 #if LIBCURL_VERSION_NUM >= 0x070c00
780 if (!curl_errorstr[0])
781 strlcpy(curl_errorstr,
782 curl_easy_strerror(results->curl_result),
783 sizeof(curl_errorstr));
784 #endif
785 return HTTP_ERROR;
786 }
787 }
788
789 /* http_request() targets */
790 #define HTTP_REQUEST_STRBUF 0
791 #define HTTP_REQUEST_FILE 1
792
793 static int http_request(const char *url, void *result, int target, int options)
794 {
795 struct active_request_slot *slot;
796 struct slot_results results;
797 struct curl_slist *headers = NULL;
798 struct strbuf buf = STRBUF_INIT;
799 int ret;
800
801 slot = get_active_slot();
802 slot->results = &results;
803 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
804
805 if (result == NULL) {
806 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
807 } else {
808 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
809 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
810
811 if (target == HTTP_REQUEST_FILE) {
812 long posn = ftell(result);
813 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
814 fwrite);
815 if (posn > 0) {
816 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
817 headers = curl_slist_append(headers, buf.buf);
818 strbuf_reset(&buf);
819 }
820 } else
821 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
822 fwrite_buffer);
823 }
824
825 strbuf_addstr(&buf, "Pragma:");
826 if (options & HTTP_NO_CACHE)
827 strbuf_addstr(&buf, " no-cache");
828
829 headers = curl_slist_append(headers, buf.buf);
830
831 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
832 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
833 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
834
835 if (start_active_slot(slot)) {
836 run_active_slot(slot);
837 ret = handle_curl_result(slot, &results);
838 } else {
839 error("Unable to start HTTP request for %s", url);
840 ret = HTTP_START_FAILED;
841 }
842
843 curl_slist_free_all(headers);
844 strbuf_release(&buf);
845
846 return ret;
847 }
848
849 static int http_request_reauth(const char *url, void *result, int target,
850 int options)
851 {
852 int ret = http_request(url, result, target, options);
853 if (ret != HTTP_REAUTH)
854 return ret;
855 return http_request(url, result, target, options);
856 }
857
858 int http_get_strbuf(const char *url, struct strbuf *result, int options)
859 {
860 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
861 }
862
863 /*
864 * Downloads a URL and stores the result in the given file.
865 *
866 * If a previous interrupted download is detected (i.e. a previous temporary
867 * file is still around) the download is resumed.
868 */
869 static int http_get_file(const char *url, const char *filename, int options)
870 {
871 int ret;
872 struct strbuf tmpfile = STRBUF_INIT;
873 FILE *result;
874
875 strbuf_addf(&tmpfile, "%s.temp", filename);
876 result = fopen(tmpfile.buf, "a");
877 if (! result) {
878 error("Unable to open local file %s", tmpfile.buf);
879 ret = HTTP_ERROR;
880 goto cleanup;
881 }
882
883 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
884 fclose(result);
885
886 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
887 ret = HTTP_ERROR;
888 cleanup:
889 strbuf_release(&tmpfile);
890 return ret;
891 }
892
893 int http_error(const char *url, int ret)
894 {
895 /* http_request has already handled HTTP_START_FAILED. */
896 if (ret != HTTP_START_FAILED)
897 error("%s while accessing %s", curl_errorstr, url);
898
899 return ret;
900 }
901
902 int http_fetch_ref(const char *base, struct ref *ref)
903 {
904 char *url;
905 struct strbuf buffer = STRBUF_INIT;
906 int ret = -1;
907
908 url = quote_ref_url(base, ref->name);
909 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
910 strbuf_rtrim(&buffer);
911 if (buffer.len == 40)
912 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
913 else if (!prefixcmp(buffer.buf, "ref: ")) {
914 ref->symref = xstrdup(buffer.buf + 5);
915 ret = 0;
916 }
917 }
918
919 strbuf_release(&buffer);
920 free(url);
921 return ret;
922 }
923
924 /* Helpers for fetching packs */
925 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
926 {
927 char *url, *tmp;
928 struct strbuf buf = STRBUF_INIT;
929
930 if (http_is_verbose)
931 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
932
933 end_url_with_slash(&buf, base_url);
934 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
935 url = strbuf_detach(&buf, NULL);
936
937 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
938 tmp = strbuf_detach(&buf, NULL);
939
940 if (http_get_file(url, tmp, 0) != HTTP_OK) {
941 error("Unable to get pack index %s", url);
942 free(tmp);
943 tmp = NULL;
944 }
945
946 free(url);
947 return tmp;
948 }
949
950 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
951 unsigned char *sha1, const char *base_url)
952 {
953 struct packed_git *new_pack;
954 char *tmp_idx = NULL;
955 int ret;
956
957 if (has_pack_index(sha1)) {
958 new_pack = parse_pack_index(sha1, NULL);
959 if (!new_pack)
960 return -1; /* parse_pack_index() already issued error message */
961 goto add_pack;
962 }
963
964 tmp_idx = fetch_pack_index(sha1, base_url);
965 if (!tmp_idx)
966 return -1;
967
968 new_pack = parse_pack_index(sha1, tmp_idx);
969 if (!new_pack) {
970 unlink(tmp_idx);
971 free(tmp_idx);
972
973 return -1; /* parse_pack_index() already issued error message */
974 }
975
976 ret = verify_pack_index(new_pack);
977 if (!ret) {
978 close_pack_index(new_pack);
979 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
980 }
981 free(tmp_idx);
982 if (ret)
983 return -1;
984
985 add_pack:
986 new_pack->next = *packs_head;
987 *packs_head = new_pack;
988 return 0;
989 }
990
991 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
992 {
993 int ret = 0, i = 0;
994 char *url, *data;
995 struct strbuf buf = STRBUF_INIT;
996 unsigned char sha1[20];
997
998 end_url_with_slash(&buf, base_url);
999 strbuf_addstr(&buf, "objects/info/packs");
1000 url = strbuf_detach(&buf, NULL);
1001
1002 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1003 if (ret != HTTP_OK)
1004 goto cleanup;
1005
1006 data = buf.buf;
1007 while (i < buf.len) {
1008 switch (data[i]) {
1009 case 'P':
1010 i++;
1011 if (i + 52 <= buf.len &&
1012 !prefixcmp(data + i, " pack-") &&
1013 !prefixcmp(data + i + 46, ".pack\n")) {
1014 get_sha1_hex(data + i + 6, sha1);
1015 fetch_and_setup_pack_index(packs_head, sha1,
1016 base_url);
1017 i += 51;
1018 break;
1019 }
1020 default:
1021 while (i < buf.len && data[i] != '\n')
1022 i++;
1023 }
1024 i++;
1025 }
1026
1027 cleanup:
1028 free(url);
1029 return ret;
1030 }
1031
1032 void release_http_pack_request(struct http_pack_request *preq)
1033 {
1034 if (preq->packfile != NULL) {
1035 fclose(preq->packfile);
1036 preq->packfile = NULL;
1037 }
1038 if (preq->range_header != NULL) {
1039 curl_slist_free_all(preq->range_header);
1040 preq->range_header = NULL;
1041 }
1042 preq->slot = NULL;
1043 free(preq->url);
1044 }
1045
1046 int finish_http_pack_request(struct http_pack_request *preq)
1047 {
1048 struct packed_git **lst;
1049 struct packed_git *p = preq->target;
1050 char *tmp_idx;
1051 struct child_process ip;
1052 const char *ip_argv[8];
1053
1054 close_pack_index(p);
1055
1056 fclose(preq->packfile);
1057 preq->packfile = NULL;
1058
1059 lst = preq->lst;
1060 while (*lst != p)
1061 lst = &((*lst)->next);
1062 *lst = (*lst)->next;
1063
1064 tmp_idx = xstrdup(preq->tmpfile);
1065 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1066 ".idx.temp");
1067
1068 ip_argv[0] = "index-pack";
1069 ip_argv[1] = "-o";
1070 ip_argv[2] = tmp_idx;
1071 ip_argv[3] = preq->tmpfile;
1072 ip_argv[4] = NULL;
1073
1074 memset(&ip, 0, sizeof(ip));
1075 ip.argv = ip_argv;
1076 ip.git_cmd = 1;
1077 ip.no_stdin = 1;
1078 ip.no_stdout = 1;
1079
1080 if (run_command(&ip)) {
1081 unlink(preq->tmpfile);
1082 unlink(tmp_idx);
1083 free(tmp_idx);
1084 return -1;
1085 }
1086
1087 unlink(sha1_pack_index_name(p->sha1));
1088
1089 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1090 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1091 free(tmp_idx);
1092 return -1;
1093 }
1094
1095 install_packed_git(p);
1096 free(tmp_idx);
1097 return 0;
1098 }
1099
1100 struct http_pack_request *new_http_pack_request(
1101 struct packed_git *target, const char *base_url)
1102 {
1103 long prev_posn = 0;
1104 char range[RANGE_HEADER_SIZE];
1105 struct strbuf buf = STRBUF_INIT;
1106 struct http_pack_request *preq;
1107
1108 preq = xcalloc(1, sizeof(*preq));
1109 preq->target = target;
1110
1111 end_url_with_slash(&buf, base_url);
1112 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1113 sha1_to_hex(target->sha1));
1114 preq->url = strbuf_detach(&buf, NULL);
1115
1116 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1117 sha1_pack_name(target->sha1));
1118 preq->packfile = fopen(preq->tmpfile, "a");
1119 if (!preq->packfile) {
1120 error("Unable to open local file %s for pack",
1121 preq->tmpfile);
1122 goto abort;
1123 }
1124
1125 preq->slot = get_active_slot();
1126 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1127 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1128 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1129 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1130 no_pragma_header);
1131
1132 /*
1133 * If there is data present from a previous transfer attempt,
1134 * resume where it left off
1135 */
1136 prev_posn = ftell(preq->packfile);
1137 if (prev_posn>0) {
1138 if (http_is_verbose)
1139 fprintf(stderr,
1140 "Resuming fetch of pack %s at byte %ld\n",
1141 sha1_to_hex(target->sha1), prev_posn);
1142 sprintf(range, "Range: bytes=%ld-", prev_posn);
1143 preq->range_header = curl_slist_append(NULL, range);
1144 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1145 preq->range_header);
1146 }
1147
1148 return preq;
1149
1150 abort:
1151 free(preq->url);
1152 free(preq);
1153 return NULL;
1154 }
1155
1156 /* Helpers for fetching objects (loose) */
1157 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1158 void *data)
1159 {
1160 unsigned char expn[4096];
1161 size_t size = eltsize * nmemb;
1162 int posn = 0;
1163 struct http_object_request *freq =
1164 (struct http_object_request *)data;
1165 do {
1166 ssize_t retval = xwrite(freq->localfile,
1167 (char *) ptr + posn, size - posn);
1168 if (retval < 0)
1169 return posn;
1170 posn += retval;
1171 } while (posn < size);
1172
1173 freq->stream.avail_in = size;
1174 freq->stream.next_in = (void *)ptr;
1175 do {
1176 freq->stream.next_out = expn;
1177 freq->stream.avail_out = sizeof(expn);
1178 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1179 git_SHA1_Update(&freq->c, expn,
1180 sizeof(expn) - freq->stream.avail_out);
1181 } while (freq->stream.avail_in && freq->zret == Z_OK);
1182 return size;
1183 }
1184
1185 struct http_object_request *new_http_object_request(const char *base_url,
1186 unsigned char *sha1)
1187 {
1188 char *hex = sha1_to_hex(sha1);
1189 char *filename;
1190 char prevfile[PATH_MAX];
1191 int prevlocal;
1192 char prev_buf[PREV_BUF_SIZE];
1193 ssize_t prev_read = 0;
1194 long prev_posn = 0;
1195 char range[RANGE_HEADER_SIZE];
1196 struct curl_slist *range_header = NULL;
1197 struct http_object_request *freq;
1198
1199 freq = xcalloc(1, sizeof(*freq));
1200 hashcpy(freq->sha1, sha1);
1201 freq->localfile = -1;
1202
1203 filename = sha1_file_name(sha1);
1204 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1205 "%s.temp", filename);
1206
1207 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1208 unlink_or_warn(prevfile);
1209 rename(freq->tmpfile, prevfile);
1210 unlink_or_warn(freq->tmpfile);
1211
1212 if (freq->localfile != -1)
1213 error("fd leakage in start: %d", freq->localfile);
1214 freq->localfile = open(freq->tmpfile,
1215 O_WRONLY | O_CREAT | O_EXCL, 0666);
1216 /*
1217 * This could have failed due to the "lazy directory creation";
1218 * try to mkdir the last path component.
1219 */
1220 if (freq->localfile < 0 && errno == ENOENT) {
1221 char *dir = strrchr(freq->tmpfile, '/');
1222 if (dir) {
1223 *dir = 0;
1224 mkdir(freq->tmpfile, 0777);
1225 *dir = '/';
1226 }
1227 freq->localfile = open(freq->tmpfile,
1228 O_WRONLY | O_CREAT | O_EXCL, 0666);
1229 }
1230
1231 if (freq->localfile < 0) {
1232 error("Couldn't create temporary file %s: %s",
1233 freq->tmpfile, strerror(errno));
1234 goto abort;
1235 }
1236
1237 git_inflate_init(&freq->stream);
1238
1239 git_SHA1_Init(&freq->c);
1240
1241 freq->url = get_remote_object_url(base_url, hex, 0);
1242
1243 /*
1244 * If a previous temp file is present, process what was already
1245 * fetched.
1246 */
1247 prevlocal = open(prevfile, O_RDONLY);
1248 if (prevlocal != -1) {
1249 do {
1250 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1251 if (prev_read>0) {
1252 if (fwrite_sha1_file(prev_buf,
1253 1,
1254 prev_read,
1255 freq) == prev_read) {
1256 prev_posn += prev_read;
1257 } else {
1258 prev_read = -1;
1259 }
1260 }
1261 } while (prev_read > 0);
1262 close(prevlocal);
1263 }
1264 unlink_or_warn(prevfile);
1265
1266 /*
1267 * Reset inflate/SHA1 if there was an error reading the previous temp
1268 * file; also rewind to the beginning of the local file.
1269 */
1270 if (prev_read == -1) {
1271 memset(&freq->stream, 0, sizeof(freq->stream));
1272 git_inflate_init(&freq->stream);
1273 git_SHA1_Init(&freq->c);
1274 if (prev_posn>0) {
1275 prev_posn = 0;
1276 lseek(freq->localfile, 0, SEEK_SET);
1277 if (ftruncate(freq->localfile, 0) < 0) {
1278 error("Couldn't truncate temporary file %s: %s",
1279 freq->tmpfile, strerror(errno));
1280 goto abort;
1281 }
1282 }
1283 }
1284
1285 freq->slot = get_active_slot();
1286
1287 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1288 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1289 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1290 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1291 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1292
1293 /*
1294 * If we have successfully processed data from a previous fetch
1295 * attempt, only fetch the data we don't already have.
1296 */
1297 if (prev_posn>0) {
1298 if (http_is_verbose)
1299 fprintf(stderr,
1300 "Resuming fetch of object %s at byte %ld\n",
1301 hex, prev_posn);
1302 sprintf(range, "Range: bytes=%ld-", prev_posn);
1303 range_header = curl_slist_append(range_header, range);
1304 curl_easy_setopt(freq->slot->curl,
1305 CURLOPT_HTTPHEADER, range_header);
1306 }
1307
1308 return freq;
1309
1310 abort:
1311 free(freq->url);
1312 free(freq);
1313 return NULL;
1314 }
1315
1316 void process_http_object_request(struct http_object_request *freq)
1317 {
1318 if (freq->slot == NULL)
1319 return;
1320 freq->curl_result = freq->slot->curl_result;
1321 freq->http_code = freq->slot->http_code;
1322 freq->slot = NULL;
1323 }
1324
1325 int finish_http_object_request(struct http_object_request *freq)
1326 {
1327 struct stat st;
1328
1329 close(freq->localfile);
1330 freq->localfile = -1;
1331
1332 process_http_object_request(freq);
1333
1334 if (freq->http_code == 416) {
1335 warning("requested range invalid; we may already have all the data.");
1336 } else if (freq->curl_result != CURLE_OK) {
1337 if (stat(freq->tmpfile, &st) == 0)
1338 if (st.st_size == 0)
1339 unlink_or_warn(freq->tmpfile);
1340 return -1;
1341 }
1342
1343 git_inflate_end(&freq->stream);
1344 git_SHA1_Final(freq->real_sha1, &freq->c);
1345 if (freq->zret != Z_STREAM_END) {
1346 unlink_or_warn(freq->tmpfile);
1347 return -1;
1348 }
1349 if (hashcmp(freq->sha1, freq->real_sha1)) {
1350 unlink_or_warn(freq->tmpfile);
1351 return -1;
1352 }
1353 freq->rename =
1354 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1355
1356 return freq->rename;
1357 }
1358
1359 void abort_http_object_request(struct http_object_request *freq)
1360 {
1361 unlink_or_warn(freq->tmpfile);
1362
1363 release_http_object_request(freq);
1364 }
1365
1366 void release_http_object_request(struct http_object_request *freq)
1367 {
1368 if (freq->localfile != -1) {
1369 close(freq->localfile);
1370 freq->localfile = -1;
1371 }
1372 if (freq->url != NULL) {
1373 free(freq->url);
1374 freq->url = NULL;
1375 }
1376 if (freq->slot != NULL) {
1377 freq->slot->callback_func = NULL;
1378 freq->slot->callback_data = NULL;
1379 release_active_slot(freq->slot);
1380 freq->slot = NULL;
1381 }
1382 }
git with Jakub Narębski modifications