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Merge branch 'jk/diff-algo-finishing-touches'
[git/gitweb.git] / http.c
blob58c063c91b15d5c20e0233c57fb2fa7377163379
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 #include "pkt-line.h"
9
10 int active_requests;
11 int http_is_verbose;
12 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
13
14 #if LIBCURL_VERSION_NUM >= 0x070a06
15 #define LIBCURL_CAN_HANDLE_AUTH_ANY
16 #endif
17
18 static int min_curl_sessions = 1;
19 static int curl_session_count;
20 #ifdef USE_CURL_MULTI
21 static int max_requests = -1;
22 static CURLM *curlm;
23 #endif
24 #ifndef NO_CURL_EASY_DUPHANDLE
25 static CURL *curl_default;
26 #endif
27
28 #define PREV_BUF_SIZE 4096
29 #define RANGE_HEADER_SIZE 30
30
31 char curl_errorstr[CURL_ERROR_SIZE];
32
33 static int curl_ssl_verify = -1;
34 static const char *ssl_cert;
35 #if LIBCURL_VERSION_NUM >= 0x070903
36 static const char *ssl_key;
37 #endif
38 #if LIBCURL_VERSION_NUM >= 0x070908
39 static const char *ssl_capath;
40 #endif
41 static const char *ssl_cainfo;
42 static long curl_low_speed_limit = -1;
43 static long curl_low_speed_time = -1;
44 static int curl_ftp_no_epsv;
45 static const char *curl_http_proxy;
46 static const char *curl_cookie_file;
47 static struct credential http_auth = CREDENTIAL_INIT;
48 static int http_proactive_auth;
49 static const char *user_agent;
50
51 #if LIBCURL_VERSION_NUM >= 0x071700
52 /* Use CURLOPT_KEYPASSWD as is */
53 #elif LIBCURL_VERSION_NUM >= 0x070903
54 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
55 #else
56 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
57 #endif
58
59 static struct credential cert_auth = CREDENTIAL_INIT;
60 static int ssl_cert_password_required;
61
62 static struct curl_slist *pragma_header;
63 static struct curl_slist *no_pragma_header;
64
65 static struct active_request_slot *active_queue_head;
66
67 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
68 {
69 size_t size = eltsize * nmemb;
70 struct buffer *buffer = buffer_;
71
72 if (size > buffer->buf.len - buffer->posn)
73 size = buffer->buf.len - buffer->posn;
74 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
75 buffer->posn += size;
76
77 return size;
78 }
79
80 #ifndef NO_CURL_IOCTL
81 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
82 {
83 struct buffer *buffer = clientp;
84
85 switch (cmd) {
86 case CURLIOCMD_NOP:
87 return CURLIOE_OK;
88
89 case CURLIOCMD_RESTARTREAD:
90 buffer->posn = 0;
91 return CURLIOE_OK;
92
93 default:
94 return CURLIOE_UNKNOWNCMD;
95 }
96 }
97 #endif
98
99 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
100 {
101 size_t size = eltsize * nmemb;
102 struct strbuf *buffer = buffer_;
103
104 strbuf_add(buffer, ptr, size);
105 return size;
106 }
107
108 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
109 {
110 return eltsize * nmemb;
111 }
112
113 #ifdef USE_CURL_MULTI
114 static void process_curl_messages(void)
115 {
116 int num_messages;
117 struct active_request_slot *slot;
118 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
119
120 while (curl_message != NULL) {
121 if (curl_message->msg == CURLMSG_DONE) {
122 int curl_result = curl_message->data.result;
123 slot = active_queue_head;
124 while (slot != NULL &&
125 slot->curl != curl_message->easy_handle)
126 slot = slot->next;
127 if (slot != NULL) {
128 curl_multi_remove_handle(curlm, slot->curl);
129 slot->curl_result = curl_result;
130 finish_active_slot(slot);
131 } else {
132 fprintf(stderr, "Received DONE message for unknown request!\n");
133 }
134 } else {
135 fprintf(stderr, "Unknown CURL message received: %d\n",
136 (int)curl_message->msg);
137 }
138 curl_message = curl_multi_info_read(curlm, &num_messages);
139 }
140 }
141 #endif
142
143 static int http_options(const char *var, const char *value, void *cb)
144 {
145 if (!strcmp("http.sslverify", var)) {
146 curl_ssl_verify = git_config_bool(var, value);
147 return 0;
148 }
149 if (!strcmp("http.sslcert", var))
150 return git_config_string(&ssl_cert, var, value);
151 #if LIBCURL_VERSION_NUM >= 0x070903
152 if (!strcmp("http.sslkey", var))
153 return git_config_string(&ssl_key, var, value);
154 #endif
155 #if LIBCURL_VERSION_NUM >= 0x070908
156 if (!strcmp("http.sslcapath", var))
157 return git_config_string(&ssl_capath, var, value);
158 #endif
159 if (!strcmp("http.sslcainfo", var))
160 return git_config_string(&ssl_cainfo, var, value);
161 if (!strcmp("http.sslcertpasswordprotected", var)) {
162 if (git_config_bool(var, value))
163 ssl_cert_password_required = 1;
164 return 0;
165 }
166 if (!strcmp("http.minsessions", var)) {
167 min_curl_sessions = git_config_int(var, value);
168 #ifndef USE_CURL_MULTI
169 if (min_curl_sessions > 1)
170 min_curl_sessions = 1;
171 #endif
172 return 0;
173 }
174 #ifdef USE_CURL_MULTI
175 if (!strcmp("http.maxrequests", var)) {
176 max_requests = git_config_int(var, value);
177 return 0;
178 }
179 #endif
180 if (!strcmp("http.lowspeedlimit", var)) {
181 curl_low_speed_limit = (long)git_config_int(var, value);
182 return 0;
183 }
184 if (!strcmp("http.lowspeedtime", var)) {
185 curl_low_speed_time = (long)git_config_int(var, value);
186 return 0;
187 }
188
189 if (!strcmp("http.noepsv", var)) {
190 curl_ftp_no_epsv = git_config_bool(var, value);
191 return 0;
192 }
193 if (!strcmp("http.proxy", var))
194 return git_config_string(&curl_http_proxy, var, value);
195
196 if (!strcmp("http.cookiefile", var))
197 return git_config_string(&curl_cookie_file, var, value);
198
199 if (!strcmp("http.postbuffer", var)) {
200 http_post_buffer = git_config_int(var, value);
201 if (http_post_buffer < LARGE_PACKET_MAX)
202 http_post_buffer = LARGE_PACKET_MAX;
203 return 0;
204 }
205
206 if (!strcmp("http.useragent", var))
207 return git_config_string(&user_agent, var, value);
208
209 /* Fall back on the default ones */
210 return git_default_config(var, value, cb);
211 }
212
213 static void init_curl_http_auth(CURL *result)
214 {
215 if (!http_auth.username)
216 return;
217
218 credential_fill(&http_auth);
219
220 #if LIBCURL_VERSION_NUM >= 0x071301
221 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
222 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
223 #else
224 {
225 static struct strbuf up = STRBUF_INIT;
226 strbuf_reset(&up);
227 strbuf_addf(&up, "%s:%s",
228 http_auth.username, http_auth.password);
229 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
230 }
231 #endif
232 }
233
234 static int has_cert_password(void)
235 {
236 if (ssl_cert == NULL || ssl_cert_password_required != 1)
237 return 0;
238 if (!cert_auth.password) {
239 cert_auth.protocol = xstrdup("cert");
240 cert_auth.username = xstrdup("");
241 cert_auth.path = xstrdup(ssl_cert);
242 credential_fill(&cert_auth);
243 }
244 return 1;
245 }
246
247 static CURL *get_curl_handle(void)
248 {
249 CURL *result = curl_easy_init();
250
251 if (!curl_ssl_verify) {
252 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
253 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
254 } else {
255 /* Verify authenticity of the peer's certificate */
256 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
257 /* The name in the cert must match whom we tried to connect */
258 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
259 }
260
261 #if LIBCURL_VERSION_NUM >= 0x070907
262 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
263 #endif
264 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
265 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
266 #endif
267
268 if (http_proactive_auth)
269 init_curl_http_auth(result);
270
271 if (ssl_cert != NULL)
272 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
273 if (has_cert_password())
274 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
275 #if LIBCURL_VERSION_NUM >= 0x070903
276 if (ssl_key != NULL)
277 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
278 #endif
279 #if LIBCURL_VERSION_NUM >= 0x070908
280 if (ssl_capath != NULL)
281 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
282 #endif
283 if (ssl_cainfo != NULL)
284 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
285 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
286
287 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
288 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
289 curl_low_speed_limit);
290 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
291 curl_low_speed_time);
292 }
293
294 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
295 #if LIBCURL_VERSION_NUM >= 0x071301
296 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
297 #elif LIBCURL_VERSION_NUM >= 0x071101
298 curl_easy_setopt(result, CURLOPT_POST301, 1);
299 #endif
300
301 if (getenv("GIT_CURL_VERBOSE"))
302 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
303
304 curl_easy_setopt(result, CURLOPT_USERAGENT,
305 user_agent ? user_agent : git_user_agent());
306
307 if (curl_ftp_no_epsv)
308 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
309
310 if (curl_http_proxy) {
311 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
312 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
313 }
314
315 return result;
316 }
317
318 static void set_from_env(const char **var, const char *envname)
319 {
320 const char *val = getenv(envname);
321 if (val)
322 *var = val;
323 }
324
325 void http_init(struct remote *remote, const char *url, int proactive_auth)
326 {
327 char *low_speed_limit;
328 char *low_speed_time;
329
330 http_is_verbose = 0;
331
332 git_config(http_options, NULL);
333
334 curl_global_init(CURL_GLOBAL_ALL);
335
336 http_proactive_auth = proactive_auth;
337
338 if (remote && remote->http_proxy)
339 curl_http_proxy = xstrdup(remote->http_proxy);
340
341 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
342 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
343
344 #ifdef USE_CURL_MULTI
345 {
346 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
347 if (http_max_requests != NULL)
348 max_requests = atoi(http_max_requests);
349 }
350
351 curlm = curl_multi_init();
352 if (curlm == NULL) {
353 fprintf(stderr, "Error creating curl multi handle.\n");
354 exit(1);
355 }
356 #endif
357
358 if (getenv("GIT_SSL_NO_VERIFY"))
359 curl_ssl_verify = 0;
360
361 set_from_env(&ssl_cert, "GIT_SSL_CERT");
362 #if LIBCURL_VERSION_NUM >= 0x070903
363 set_from_env(&ssl_key, "GIT_SSL_KEY");
364 #endif
365 #if LIBCURL_VERSION_NUM >= 0x070908
366 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
367 #endif
368 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
369
370 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
371
372 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
373 if (low_speed_limit != NULL)
374 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
375 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
376 if (low_speed_time != NULL)
377 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
378
379 if (curl_ssl_verify == -1)
380 curl_ssl_verify = 1;
381
382 curl_session_count = 0;
383 #ifdef USE_CURL_MULTI
384 if (max_requests < 1)
385 max_requests = DEFAULT_MAX_REQUESTS;
386 #endif
387
388 if (getenv("GIT_CURL_FTP_NO_EPSV"))
389 curl_ftp_no_epsv = 1;
390
391 if (url) {
392 credential_from_url(&http_auth, url);
393 if (!ssl_cert_password_required &&
394 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
395 !prefixcmp(url, "https://"))
396 ssl_cert_password_required = 1;
397 }
398
399 #ifndef NO_CURL_EASY_DUPHANDLE
400 curl_default = get_curl_handle();
401 #endif
402 }
403
404 void http_cleanup(void)
405 {
406 struct active_request_slot *slot = active_queue_head;
407
408 while (slot != NULL) {
409 struct active_request_slot *next = slot->next;
410 if (slot->curl != NULL) {
411 #ifdef USE_CURL_MULTI
412 curl_multi_remove_handle(curlm, slot->curl);
413 #endif
414 curl_easy_cleanup(slot->curl);
415 }
416 free(slot);
417 slot = next;
418 }
419 active_queue_head = NULL;
420
421 #ifndef NO_CURL_EASY_DUPHANDLE
422 curl_easy_cleanup(curl_default);
423 #endif
424
425 #ifdef USE_CURL_MULTI
426 curl_multi_cleanup(curlm);
427 #endif
428 curl_global_cleanup();
429
430 curl_slist_free_all(pragma_header);
431 pragma_header = NULL;
432
433 curl_slist_free_all(no_pragma_header);
434 no_pragma_header = NULL;
435
436 if (curl_http_proxy) {
437 free((void *)curl_http_proxy);
438 curl_http_proxy = NULL;
439 }
440
441 if (cert_auth.password != NULL) {
442 memset(cert_auth.password, 0, strlen(cert_auth.password));
443 free(cert_auth.password);
444 cert_auth.password = NULL;
445 }
446 ssl_cert_password_required = 0;
447 }
448
449 struct active_request_slot *get_active_slot(void)
450 {
451 struct active_request_slot *slot = active_queue_head;
452 struct active_request_slot *newslot;
453
454 #ifdef USE_CURL_MULTI
455 int num_transfers;
456
457 /* Wait for a slot to open up if the queue is full */
458 while (active_requests >= max_requests) {
459 curl_multi_perform(curlm, &num_transfers);
460 if (num_transfers < active_requests)
461 process_curl_messages();
462 }
463 #endif
464
465 while (slot != NULL && slot->in_use)
466 slot = slot->next;
467
468 if (slot == NULL) {
469 newslot = xmalloc(sizeof(*newslot));
470 newslot->curl = NULL;
471 newslot->in_use = 0;
472 newslot->next = NULL;
473
474 slot = active_queue_head;
475 if (slot == NULL) {
476 active_queue_head = newslot;
477 } else {
478 while (slot->next != NULL)
479 slot = slot->next;
480 slot->next = newslot;
481 }
482 slot = newslot;
483 }
484
485 if (slot->curl == NULL) {
486 #ifdef NO_CURL_EASY_DUPHANDLE
487 slot->curl = get_curl_handle();
488 #else
489 slot->curl = curl_easy_duphandle(curl_default);
490 #endif
491 curl_session_count++;
492 }
493
494 active_requests++;
495 slot->in_use = 1;
496 slot->results = NULL;
497 slot->finished = NULL;
498 slot->callback_data = NULL;
499 slot->callback_func = NULL;
500 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
501 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
502 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
503 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
504 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
505 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
506 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
507 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
508 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
509 if (http_auth.password)
510 init_curl_http_auth(slot->curl);
511
512 return slot;
513 }
514
515 int start_active_slot(struct active_request_slot *slot)
516 {
517 #ifdef USE_CURL_MULTI
518 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
519 int num_transfers;
520
521 if (curlm_result != CURLM_OK &&
522 curlm_result != CURLM_CALL_MULTI_PERFORM) {
523 active_requests--;
524 slot->in_use = 0;
525 return 0;
526 }
527
528 /*
529 * We know there must be something to do, since we just added
530 * something.
531 */
532 curl_multi_perform(curlm, &num_transfers);
533 #endif
534 return 1;
535 }
536
537 #ifdef USE_CURL_MULTI
538 struct fill_chain {
539 void *data;
540 int (*fill)(void *);
541 struct fill_chain *next;
542 };
543
544 static struct fill_chain *fill_cfg;
545
546 void add_fill_function(void *data, int (*fill)(void *))
547 {
548 struct fill_chain *new = xmalloc(sizeof(*new));
549 struct fill_chain **linkp = &fill_cfg;
550 new->data = data;
551 new->fill = fill;
552 new->next = NULL;
553 while (*linkp)
554 linkp = &(*linkp)->next;
555 *linkp = new;
556 }
557
558 void fill_active_slots(void)
559 {
560 struct active_request_slot *slot = active_queue_head;
561
562 while (active_requests < max_requests) {
563 struct fill_chain *fill;
564 for (fill = fill_cfg; fill; fill = fill->next)
565 if (fill->fill(fill->data))
566 break;
567
568 if (!fill)
569 break;
570 }
571
572 while (slot != NULL) {
573 if (!slot->in_use && slot->curl != NULL
574 && curl_session_count > min_curl_sessions) {
575 curl_easy_cleanup(slot->curl);
576 slot->curl = NULL;
577 curl_session_count--;
578 }
579 slot = slot->next;
580 }
581 }
582
583 void step_active_slots(void)
584 {
585 int num_transfers;
586 CURLMcode curlm_result;
587
588 do {
589 curlm_result = curl_multi_perform(curlm, &num_transfers);
590 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
591 if (num_transfers < active_requests) {
592 process_curl_messages();
593 fill_active_slots();
594 }
595 }
596 #endif
597
598 void run_active_slot(struct active_request_slot *slot)
599 {
600 #ifdef USE_CURL_MULTI
601 fd_set readfds;
602 fd_set writefds;
603 fd_set excfds;
604 int max_fd;
605 struct timeval select_timeout;
606 int finished = 0;
607
608 slot->finished = &finished;
609 while (!finished) {
610 step_active_slots();
611
612 if (slot->in_use) {
613 #if LIBCURL_VERSION_NUM >= 0x070f04
614 long curl_timeout;
615 curl_multi_timeout(curlm, &curl_timeout);
616 if (curl_timeout == 0) {
617 continue;
618 } else if (curl_timeout == -1) {
619 select_timeout.tv_sec = 0;
620 select_timeout.tv_usec = 50000;
621 } else {
622 select_timeout.tv_sec = curl_timeout / 1000;
623 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
624 }
625 #else
626 select_timeout.tv_sec = 0;
627 select_timeout.tv_usec = 50000;
628 #endif
629
630 max_fd = -1;
631 FD_ZERO(&readfds);
632 FD_ZERO(&writefds);
633 FD_ZERO(&excfds);
634 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
635
636 /*
637 * It can happen that curl_multi_timeout returns a pathologically
638 * long timeout when curl_multi_fdset returns no file descriptors
639 * to read. See commit message for more details.
640 */
641 if (max_fd < 0 &&
642 (select_timeout.tv_sec > 0 ||
643 select_timeout.tv_usec > 50000)) {
644 select_timeout.tv_sec = 0;
645 select_timeout.tv_usec = 50000;
646 }
647
648 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
649 }
650 }
651 #else
652 while (slot->in_use) {
653 slot->curl_result = curl_easy_perform(slot->curl);
654 finish_active_slot(slot);
655 }
656 #endif
657 }
658
659 static void closedown_active_slot(struct active_request_slot *slot)
660 {
661 active_requests--;
662 slot->in_use = 0;
663 }
664
665 static void release_active_slot(struct active_request_slot *slot)
666 {
667 closedown_active_slot(slot);
668 if (slot->curl && curl_session_count > min_curl_sessions) {
669 #ifdef USE_CURL_MULTI
670 curl_multi_remove_handle(curlm, slot->curl);
671 #endif
672 curl_easy_cleanup(slot->curl);
673 slot->curl = NULL;
674 curl_session_count--;
675 }
676 #ifdef USE_CURL_MULTI
677 fill_active_slots();
678 #endif
679 }
680
681 void finish_active_slot(struct active_request_slot *slot)
682 {
683 closedown_active_slot(slot);
684 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
685
686 if (slot->finished != NULL)
687 (*slot->finished) = 1;
688
689 /* Store slot results so they can be read after the slot is reused */
690 if (slot->results != NULL) {
691 slot->results->curl_result = slot->curl_result;
692 slot->results->http_code = slot->http_code;
693 }
694
695 /* Run callback if appropriate */
696 if (slot->callback_func != NULL)
697 slot->callback_func(slot->callback_data);
698 }
699
700 void finish_all_active_slots(void)
701 {
702 struct active_request_slot *slot = active_queue_head;
703
704 while (slot != NULL)
705 if (slot->in_use) {
706 run_active_slot(slot);
707 slot = active_queue_head;
708 } else {
709 slot = slot->next;
710 }
711 }
712
713 /* Helpers for modifying and creating URLs */
714 static inline int needs_quote(int ch)
715 {
716 if (((ch >= 'A') && (ch <= 'Z'))
717 || ((ch >= 'a') && (ch <= 'z'))
718 || ((ch >= '0') && (ch <= '9'))
719 || (ch == '/')
720 || (ch == '-')
721 || (ch == '.'))
722 return 0;
723 return 1;
724 }
725
726 static char *quote_ref_url(const char *base, const char *ref)
727 {
728 struct strbuf buf = STRBUF_INIT;
729 const char *cp;
730 int ch;
731
732 end_url_with_slash(&buf, base);
733
734 for (cp = ref; (ch = *cp) != 0; cp++)
735 if (needs_quote(ch))
736 strbuf_addf(&buf, "%%%02x", ch);
737 else
738 strbuf_addch(&buf, *cp);
739
740 return strbuf_detach(&buf, NULL);
741 }
742
743 void append_remote_object_url(struct strbuf *buf, const char *url,
744 const char *hex,
745 int only_two_digit_prefix)
746 {
747 end_url_with_slash(buf, url);
748
749 strbuf_addf(buf, "objects/%.*s/", 2, hex);
750 if (!only_two_digit_prefix)
751 strbuf_addf(buf, "%s", hex+2);
752 }
753
754 char *get_remote_object_url(const char *url, const char *hex,
755 int only_two_digit_prefix)
756 {
757 struct strbuf buf = STRBUF_INIT;
758 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
759 return strbuf_detach(&buf, NULL);
760 }
761
762 int handle_curl_result(struct slot_results *results)
763 {
764 /*
765 * If we see a failing http code with CURLE_OK, we have turned off
766 * FAILONERROR (to keep the server's custom error response), and should
767 * translate the code into failure here.
768 */
769 if (results->curl_result == CURLE_OK &&
770 results->http_code >= 400) {
771 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
772 /*
773 * Normally curl will already have put the "reason phrase"
774 * from the server into curl_errorstr; unfortunately without
775 * FAILONERROR it is lost, so we can give only the numeric
776 * status code.
777 */
778 snprintf(curl_errorstr, sizeof(curl_errorstr),
779 "The requested URL returned error: %ld",
780 results->http_code);
781 }
782
783 if (results->curl_result == CURLE_OK) {
784 credential_approve(&http_auth);
785 return HTTP_OK;
786 } else if (missing_target(results))
787 return HTTP_MISSING_TARGET;
788 else if (results->http_code == 401) {
789 if (http_auth.username && http_auth.password) {
790 credential_reject(&http_auth);
791 return HTTP_NOAUTH;
792 } else {
793 credential_fill(&http_auth);
794 return HTTP_REAUTH;
795 }
796 } else {
797 #if LIBCURL_VERSION_NUM >= 0x070c00
798 if (!curl_errorstr[0])
799 strlcpy(curl_errorstr,
800 curl_easy_strerror(results->curl_result),
801 sizeof(curl_errorstr));
802 #endif
803 return HTTP_ERROR;
804 }
805 }
806
807 /* http_request() targets */
808 #define HTTP_REQUEST_STRBUF 0
809 #define HTTP_REQUEST_FILE 1
810
811 static int http_request(const char *url, struct strbuf *type,
812 void *result, int target, int options)
813 {
814 struct active_request_slot *slot;
815 struct slot_results results;
816 struct curl_slist *headers = NULL;
817 struct strbuf buf = STRBUF_INIT;
818 int ret;
819
820 slot = get_active_slot();
821 slot->results = &results;
822 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
823
824 if (result == NULL) {
825 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
826 } else {
827 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
828 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
829
830 if (target == HTTP_REQUEST_FILE) {
831 long posn = ftell(result);
832 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
833 fwrite);
834 if (posn > 0) {
835 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
836 headers = curl_slist_append(headers, buf.buf);
837 strbuf_reset(&buf);
838 }
839 } else
840 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
841 fwrite_buffer);
842 }
843
844 strbuf_addstr(&buf, "Pragma:");
845 if (options & HTTP_NO_CACHE)
846 strbuf_addstr(&buf, " no-cache");
847 if (options & HTTP_KEEP_ERROR)
848 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
849
850 headers = curl_slist_append(headers, buf.buf);
851
852 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
853 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
854 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
855
856 if (start_active_slot(slot)) {
857 run_active_slot(slot);
858 ret = handle_curl_result(&results);
859 } else {
860 snprintf(curl_errorstr, sizeof(curl_errorstr),
861 "failed to start HTTP request");
862 ret = HTTP_START_FAILED;
863 }
864
865 if (type) {
866 char *t;
867 strbuf_reset(type);
868 curl_easy_getinfo(slot->curl, CURLINFO_CONTENT_TYPE, &t);
869 if (t)
870 strbuf_addstr(type, t);
871 }
872
873 curl_slist_free_all(headers);
874 strbuf_release(&buf);
875
876 return ret;
877 }
878
879 static int http_request_reauth(const char *url,
880 struct strbuf *type,
881 void *result, int target,
882 int options)
883 {
884 int ret = http_request(url, type, result, target, options);
885 if (ret != HTTP_REAUTH)
886 return ret;
887
888 /*
889 * If we are using KEEP_ERROR, the previous request may have
890 * put cruft into our output stream; we should clear it out before
891 * making our next request. We only know how to do this for
892 * the strbuf case, but that is enough to satisfy current callers.
893 */
894 if (options & HTTP_KEEP_ERROR) {
895 switch (target) {
896 case HTTP_REQUEST_STRBUF:
897 strbuf_reset(result);
898 break;
899 default:
900 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
901 }
902 }
903 return http_request(url, type, result, target, options);
904 }
905
906 int http_get_strbuf(const char *url,
907 struct strbuf *type,
908 struct strbuf *result, int options)
909 {
910 return http_request_reauth(url, type, result,
911 HTTP_REQUEST_STRBUF, options);
912 }
913
914 /*
915 * Downloads a URL and stores the result in the given file.
916 *
917 * If a previous interrupted download is detected (i.e. a previous temporary
918 * file is still around) the download is resumed.
919 */
920 static int http_get_file(const char *url, const char *filename, int options)
921 {
922 int ret;
923 struct strbuf tmpfile = STRBUF_INIT;
924 FILE *result;
925
926 strbuf_addf(&tmpfile, "%s.temp", filename);
927 result = fopen(tmpfile.buf, "a");
928 if (! result) {
929 error("Unable to open local file %s", tmpfile.buf);
930 ret = HTTP_ERROR;
931 goto cleanup;
932 }
933
934 ret = http_request_reauth(url, NULL, result, HTTP_REQUEST_FILE, options);
935 fclose(result);
936
937 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
938 ret = HTTP_ERROR;
939 cleanup:
940 strbuf_release(&tmpfile);
941 return ret;
942 }
943
944 int http_fetch_ref(const char *base, struct ref *ref)
945 {
946 char *url;
947 struct strbuf buffer = STRBUF_INIT;
948 int ret = -1;
949
950 url = quote_ref_url(base, ref->name);
951 if (http_get_strbuf(url, NULL, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
952 strbuf_rtrim(&buffer);
953 if (buffer.len == 40)
954 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
955 else if (!prefixcmp(buffer.buf, "ref: ")) {
956 ref->symref = xstrdup(buffer.buf + 5);
957 ret = 0;
958 }
959 }
960
961 strbuf_release(&buffer);
962 free(url);
963 return ret;
964 }
965
966 /* Helpers for fetching packs */
967 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
968 {
969 char *url, *tmp;
970 struct strbuf buf = STRBUF_INIT;
971
972 if (http_is_verbose)
973 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
974
975 end_url_with_slash(&buf, base_url);
976 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
977 url = strbuf_detach(&buf, NULL);
978
979 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
980 tmp = strbuf_detach(&buf, NULL);
981
982 if (http_get_file(url, tmp, 0) != HTTP_OK) {
983 error("Unable to get pack index %s", url);
984 free(tmp);
985 tmp = NULL;
986 }
987
988 free(url);
989 return tmp;
990 }
991
992 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
993 unsigned char *sha1, const char *base_url)
994 {
995 struct packed_git *new_pack;
996 char *tmp_idx = NULL;
997 int ret;
998
999 if (has_pack_index(sha1)) {
1000 new_pack = parse_pack_index(sha1, NULL);
1001 if (!new_pack)
1002 return -1; /* parse_pack_index() already issued error message */
1003 goto add_pack;
1004 }
1005
1006 tmp_idx = fetch_pack_index(sha1, base_url);
1007 if (!tmp_idx)
1008 return -1;
1009
1010 new_pack = parse_pack_index(sha1, tmp_idx);
1011 if (!new_pack) {
1012 unlink(tmp_idx);
1013 free(tmp_idx);
1014
1015 return -1; /* parse_pack_index() already issued error message */
1016 }
1017
1018 ret = verify_pack_index(new_pack);
1019 if (!ret) {
1020 close_pack_index(new_pack);
1021 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1022 }
1023 free(tmp_idx);
1024 if (ret)
1025 return -1;
1026
1027 add_pack:
1028 new_pack->next = *packs_head;
1029 *packs_head = new_pack;
1030 return 0;
1031 }
1032
1033 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1034 {
1035 int ret = 0, i = 0;
1036 char *url, *data;
1037 struct strbuf buf = STRBUF_INIT;
1038 unsigned char sha1[20];
1039
1040 end_url_with_slash(&buf, base_url);
1041 strbuf_addstr(&buf, "objects/info/packs");
1042 url = strbuf_detach(&buf, NULL);
1043
1044 ret = http_get_strbuf(url, NULL, &buf, HTTP_NO_CACHE);
1045 if (ret != HTTP_OK)
1046 goto cleanup;
1047
1048 data = buf.buf;
1049 while (i < buf.len) {
1050 switch (data[i]) {
1051 case 'P':
1052 i++;
1053 if (i + 52 <= buf.len &&
1054 !prefixcmp(data + i, " pack-") &&
1055 !prefixcmp(data + i + 46, ".pack\n")) {
1056 get_sha1_hex(data + i + 6, sha1);
1057 fetch_and_setup_pack_index(packs_head, sha1,
1058 base_url);
1059 i += 51;
1060 break;
1061 }
1062 default:
1063 while (i < buf.len && data[i] != '\n')
1064 i++;
1065 }
1066 i++;
1067 }
1068
1069 cleanup:
1070 free(url);
1071 return ret;
1072 }
1073
1074 void release_http_pack_request(struct http_pack_request *preq)
1075 {
1076 if (preq->packfile != NULL) {
1077 fclose(preq->packfile);
1078 preq->packfile = NULL;
1079 }
1080 if (preq->range_header != NULL) {
1081 curl_slist_free_all(preq->range_header);
1082 preq->range_header = NULL;
1083 }
1084 preq->slot = NULL;
1085 free(preq->url);
1086 }
1087
1088 int finish_http_pack_request(struct http_pack_request *preq)
1089 {
1090 struct packed_git **lst;
1091 struct packed_git *p = preq->target;
1092 char *tmp_idx;
1093 struct child_process ip;
1094 const char *ip_argv[8];
1095
1096 close_pack_index(p);
1097
1098 fclose(preq->packfile);
1099 preq->packfile = NULL;
1100
1101 lst = preq->lst;
1102 while (*lst != p)
1103 lst = &((*lst)->next);
1104 *lst = (*lst)->next;
1105
1106 tmp_idx = xstrdup(preq->tmpfile);
1107 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1108 ".idx.temp");
1109
1110 ip_argv[0] = "index-pack";
1111 ip_argv[1] = "-o";
1112 ip_argv[2] = tmp_idx;
1113 ip_argv[3] = preq->tmpfile;
1114 ip_argv[4] = NULL;
1115
1116 memset(&ip, 0, sizeof(ip));
1117 ip.argv = ip_argv;
1118 ip.git_cmd = 1;
1119 ip.no_stdin = 1;
1120 ip.no_stdout = 1;
1121
1122 if (run_command(&ip)) {
1123 unlink(preq->tmpfile);
1124 unlink(tmp_idx);
1125 free(tmp_idx);
1126 return -1;
1127 }
1128
1129 unlink(sha1_pack_index_name(p->sha1));
1130
1131 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1132 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1133 free(tmp_idx);
1134 return -1;
1135 }
1136
1137 install_packed_git(p);
1138 free(tmp_idx);
1139 return 0;
1140 }
1141
1142 struct http_pack_request *new_http_pack_request(
1143 struct packed_git *target, const char *base_url)
1144 {
1145 long prev_posn = 0;
1146 char range[RANGE_HEADER_SIZE];
1147 struct strbuf buf = STRBUF_INIT;
1148 struct http_pack_request *preq;
1149
1150 preq = xcalloc(1, sizeof(*preq));
1151 preq->target = target;
1152
1153 end_url_with_slash(&buf, base_url);
1154 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1155 sha1_to_hex(target->sha1));
1156 preq->url = strbuf_detach(&buf, NULL);
1157
1158 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1159 sha1_pack_name(target->sha1));
1160 preq->packfile = fopen(preq->tmpfile, "a");
1161 if (!preq->packfile) {
1162 error("Unable to open local file %s for pack",
1163 preq->tmpfile);
1164 goto abort;
1165 }
1166
1167 preq->slot = get_active_slot();
1168 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1169 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1170 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1171 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1172 no_pragma_header);
1173
1174 /*
1175 * If there is data present from a previous transfer attempt,
1176 * resume where it left off
1177 */
1178 prev_posn = ftell(preq->packfile);
1179 if (prev_posn>0) {
1180 if (http_is_verbose)
1181 fprintf(stderr,
1182 "Resuming fetch of pack %s at byte %ld\n",
1183 sha1_to_hex(target->sha1), prev_posn);
1184 sprintf(range, "Range: bytes=%ld-", prev_posn);
1185 preq->range_header = curl_slist_append(NULL, range);
1186 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1187 preq->range_header);
1188 }
1189
1190 return preq;
1191
1192 abort:
1193 free(preq->url);
1194 free(preq);
1195 return NULL;
1196 }
1197
1198 /* Helpers for fetching objects (loose) */
1199 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1200 void *data)
1201 {
1202 unsigned char expn[4096];
1203 size_t size = eltsize * nmemb;
1204 int posn = 0;
1205 struct http_object_request *freq =
1206 (struct http_object_request *)data;
1207 do {
1208 ssize_t retval = xwrite(freq->localfile,
1209 (char *) ptr + posn, size - posn);
1210 if (retval < 0)
1211 return posn;
1212 posn += retval;
1213 } while (posn < size);
1214
1215 freq->stream.avail_in = size;
1216 freq->stream.next_in = (void *)ptr;
1217 do {
1218 freq->stream.next_out = expn;
1219 freq->stream.avail_out = sizeof(expn);
1220 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1221 git_SHA1_Update(&freq->c, expn,
1222 sizeof(expn) - freq->stream.avail_out);
1223 } while (freq->stream.avail_in && freq->zret == Z_OK);
1224 return size;
1225 }
1226
1227 struct http_object_request *new_http_object_request(const char *base_url,
1228 unsigned char *sha1)
1229 {
1230 char *hex = sha1_to_hex(sha1);
1231 char *filename;
1232 char prevfile[PATH_MAX];
1233 int prevlocal;
1234 char prev_buf[PREV_BUF_SIZE];
1235 ssize_t prev_read = 0;
1236 long prev_posn = 0;
1237 char range[RANGE_HEADER_SIZE];
1238 struct curl_slist *range_header = NULL;
1239 struct http_object_request *freq;
1240
1241 freq = xcalloc(1, sizeof(*freq));
1242 hashcpy(freq->sha1, sha1);
1243 freq->localfile = -1;
1244
1245 filename = sha1_file_name(sha1);
1246 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1247 "%s.temp", filename);
1248
1249 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1250 unlink_or_warn(prevfile);
1251 rename(freq->tmpfile, prevfile);
1252 unlink_or_warn(freq->tmpfile);
1253
1254 if (freq->localfile != -1)
1255 error("fd leakage in start: %d", freq->localfile);
1256 freq->localfile = open(freq->tmpfile,
1257 O_WRONLY | O_CREAT | O_EXCL, 0666);
1258 /*
1259 * This could have failed due to the "lazy directory creation";
1260 * try to mkdir the last path component.
1261 */
1262 if (freq->localfile < 0 && errno == ENOENT) {
1263 char *dir = strrchr(freq->tmpfile, '/');
1264 if (dir) {
1265 *dir = 0;
1266 mkdir(freq->tmpfile, 0777);
1267 *dir = '/';
1268 }
1269 freq->localfile = open(freq->tmpfile,
1270 O_WRONLY | O_CREAT | O_EXCL, 0666);
1271 }
1272
1273 if (freq->localfile < 0) {
1274 error("Couldn't create temporary file %s: %s",
1275 freq->tmpfile, strerror(errno));
1276 goto abort;
1277 }
1278
1279 git_inflate_init(&freq->stream);
1280
1281 git_SHA1_Init(&freq->c);
1282
1283 freq->url = get_remote_object_url(base_url, hex, 0);
1284
1285 /*
1286 * If a previous temp file is present, process what was already
1287 * fetched.
1288 */
1289 prevlocal = open(prevfile, O_RDONLY);
1290 if (prevlocal != -1) {
1291 do {
1292 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1293 if (prev_read>0) {
1294 if (fwrite_sha1_file(prev_buf,
1295 1,
1296 prev_read,
1297 freq) == prev_read) {
1298 prev_posn += prev_read;
1299 } else {
1300 prev_read = -1;
1301 }
1302 }
1303 } while (prev_read > 0);
1304 close(prevlocal);
1305 }
1306 unlink_or_warn(prevfile);
1307
1308 /*
1309 * Reset inflate/SHA1 if there was an error reading the previous temp
1310 * file; also rewind to the beginning of the local file.
1311 */
1312 if (prev_read == -1) {
1313 memset(&freq->stream, 0, sizeof(freq->stream));
1314 git_inflate_init(&freq->stream);
1315 git_SHA1_Init(&freq->c);
1316 if (prev_posn>0) {
1317 prev_posn = 0;
1318 lseek(freq->localfile, 0, SEEK_SET);
1319 if (ftruncate(freq->localfile, 0) < 0) {
1320 error("Couldn't truncate temporary file %s: %s",
1321 freq->tmpfile, strerror(errno));
1322 goto abort;
1323 }
1324 }
1325 }
1326
1327 freq->slot = get_active_slot();
1328
1329 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1330 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1331 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1332 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1333 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1334
1335 /*
1336 * If we have successfully processed data from a previous fetch
1337 * attempt, only fetch the data we don't already have.
1338 */
1339 if (prev_posn>0) {
1340 if (http_is_verbose)
1341 fprintf(stderr,
1342 "Resuming fetch of object %s at byte %ld\n",
1343 hex, prev_posn);
1344 sprintf(range, "Range: bytes=%ld-", prev_posn);
1345 range_header = curl_slist_append(range_header, range);
1346 curl_easy_setopt(freq->slot->curl,
1347 CURLOPT_HTTPHEADER, range_header);
1348 }
1349
1350 return freq;
1351
1352 abort:
1353 free(freq->url);
1354 free(freq);
1355 return NULL;
1356 }
1357
1358 void process_http_object_request(struct http_object_request *freq)
1359 {
1360 if (freq->slot == NULL)
1361 return;
1362 freq->curl_result = freq->slot->curl_result;
1363 freq->http_code = freq->slot->http_code;
1364 freq->slot = NULL;
1365 }
1366
1367 int finish_http_object_request(struct http_object_request *freq)
1368 {
1369 struct stat st;
1370
1371 close(freq->localfile);
1372 freq->localfile = -1;
1373
1374 process_http_object_request(freq);
1375
1376 if (freq->http_code == 416) {
1377 warning("requested range invalid; we may already have all the data.");
1378 } else if (freq->curl_result != CURLE_OK) {
1379 if (stat(freq->tmpfile, &st) == 0)
1380 if (st.st_size == 0)
1381 unlink_or_warn(freq->tmpfile);
1382 return -1;
1383 }
1384
1385 git_inflate_end(&freq->stream);
1386 git_SHA1_Final(freq->real_sha1, &freq->c);
1387 if (freq->zret != Z_STREAM_END) {
1388 unlink_or_warn(freq->tmpfile);
1389 return -1;
1390 }
1391 if (hashcmp(freq->sha1, freq->real_sha1)) {
1392 unlink_or_warn(freq->tmpfile);
1393 return -1;
1394 }
1395 freq->rename =
1396 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1397
1398 return freq->rename;
1399 }
1400
1401 void abort_http_object_request(struct http_object_request *freq)
1402 {
1403 unlink_or_warn(freq->tmpfile);
1404
1405 release_http_object_request(freq);
1406 }
1407
1408 void release_http_object_request(struct http_object_request *freq)
1409 {
1410 if (freq->localfile != -1) {
1411 close(freq->localfile);
1412 freq->localfile = -1;
1413 }
1414 if (freq->url != NULL) {
1415 free(freq->url);
1416 freq->url = NULL;
1417 }
1418 if (freq->slot != NULL) {
1419 freq->slot->callback_func = NULL;
1420 freq->slot->callback_data = NULL;
1421 release_active_slot(freq->slot);
1422 freq->slot = NULL;
1423 }
1424 }
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