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remote-testgit: implement the "done" feature manually
[alt-git.git] / http.c
blob0a8abf3be369a18fae8e743d4cc9b5f2c2f63f03
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.path = xstrdup(ssl_cert);
240 credential_fill(&cert_auth);
241 }
242 return 1;
243 }
244
245 static CURL *get_curl_handle(void)
246 {
247 CURL *result = curl_easy_init();
248
249 if (!curl_ssl_verify) {
250 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
251 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
252 } else {
253 /* Verify authenticity of the peer's certificate */
254 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
255 /* The name in the cert must match whom we tried to connect */
256 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
257 }
258
259 #if LIBCURL_VERSION_NUM >= 0x070907
260 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
261 #endif
262 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
263 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
264 #endif
265
266 if (http_proactive_auth)
267 init_curl_http_auth(result);
268
269 if (ssl_cert != NULL)
270 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
271 if (has_cert_password())
272 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
273 #if LIBCURL_VERSION_NUM >= 0x070903
274 if (ssl_key != NULL)
275 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
276 #endif
277 #if LIBCURL_VERSION_NUM >= 0x070908
278 if (ssl_capath != NULL)
279 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
280 #endif
281 if (ssl_cainfo != NULL)
282 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
283 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
284
285 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
286 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
287 curl_low_speed_limit);
288 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
289 curl_low_speed_time);
290 }
291
292 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
293 #if LIBCURL_VERSION_NUM >= 0x071301
294 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
295 #elif LIBCURL_VERSION_NUM >= 0x071101
296 curl_easy_setopt(result, CURLOPT_POST301, 1);
297 #endif
298
299 if (getenv("GIT_CURL_VERBOSE"))
300 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
301
302 curl_easy_setopt(result, CURLOPT_USERAGENT,
303 user_agent ? user_agent : git_user_agent());
304
305 if (curl_ftp_no_epsv)
306 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
307
308 if (curl_http_proxy) {
309 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
310 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
311 }
312
313 return result;
314 }
315
316 static void set_from_env(const char **var, const char *envname)
317 {
318 const char *val = getenv(envname);
319 if (val)
320 *var = val;
321 }
322
323 void http_init(struct remote *remote, const char *url, int proactive_auth)
324 {
325 char *low_speed_limit;
326 char *low_speed_time;
327
328 http_is_verbose = 0;
329
330 git_config(http_options, NULL);
331
332 curl_global_init(CURL_GLOBAL_ALL);
333
334 http_proactive_auth = proactive_auth;
335
336 if (remote && remote->http_proxy)
337 curl_http_proxy = xstrdup(remote->http_proxy);
338
339 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
340 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
341
342 #ifdef USE_CURL_MULTI
343 {
344 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
345 if (http_max_requests != NULL)
346 max_requests = atoi(http_max_requests);
347 }
348
349 curlm = curl_multi_init();
350 if (curlm == NULL) {
351 fprintf(stderr, "Error creating curl multi handle.\n");
352 exit(1);
353 }
354 #endif
355
356 if (getenv("GIT_SSL_NO_VERIFY"))
357 curl_ssl_verify = 0;
358
359 set_from_env(&ssl_cert, "GIT_SSL_CERT");
360 #if LIBCURL_VERSION_NUM >= 0x070903
361 set_from_env(&ssl_key, "GIT_SSL_KEY");
362 #endif
363 #if LIBCURL_VERSION_NUM >= 0x070908
364 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
365 #endif
366 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
367
368 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
369
370 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
371 if (low_speed_limit != NULL)
372 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
373 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
374 if (low_speed_time != NULL)
375 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
376
377 if (curl_ssl_verify == -1)
378 curl_ssl_verify = 1;
379
380 curl_session_count = 0;
381 #ifdef USE_CURL_MULTI
382 if (max_requests < 1)
383 max_requests = DEFAULT_MAX_REQUESTS;
384 #endif
385
386 if (getenv("GIT_CURL_FTP_NO_EPSV"))
387 curl_ftp_no_epsv = 1;
388
389 if (url) {
390 credential_from_url(&http_auth, url);
391 if (!ssl_cert_password_required &&
392 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
393 !prefixcmp(url, "https://"))
394 ssl_cert_password_required = 1;
395 }
396
397 #ifndef NO_CURL_EASY_DUPHANDLE
398 curl_default = get_curl_handle();
399 #endif
400 }
401
402 void http_cleanup(void)
403 {
404 struct active_request_slot *slot = active_queue_head;
405
406 while (slot != NULL) {
407 struct active_request_slot *next = slot->next;
408 if (slot->curl != NULL) {
409 #ifdef USE_CURL_MULTI
410 curl_multi_remove_handle(curlm, slot->curl);
411 #endif
412 curl_easy_cleanup(slot->curl);
413 }
414 free(slot);
415 slot = next;
416 }
417 active_queue_head = NULL;
418
419 #ifndef NO_CURL_EASY_DUPHANDLE
420 curl_easy_cleanup(curl_default);
421 #endif
422
423 #ifdef USE_CURL_MULTI
424 curl_multi_cleanup(curlm);
425 #endif
426 curl_global_cleanup();
427
428 curl_slist_free_all(pragma_header);
429 pragma_header = NULL;
430
431 curl_slist_free_all(no_pragma_header);
432 no_pragma_header = NULL;
433
434 if (curl_http_proxy) {
435 free((void *)curl_http_proxy);
436 curl_http_proxy = NULL;
437 }
438
439 if (cert_auth.password != NULL) {
440 memset(cert_auth.password, 0, strlen(cert_auth.password));
441 free(cert_auth.password);
442 cert_auth.password = NULL;
443 }
444 ssl_cert_password_required = 0;
445 }
446
447 struct active_request_slot *get_active_slot(void)
448 {
449 struct active_request_slot *slot = active_queue_head;
450 struct active_request_slot *newslot;
451
452 #ifdef USE_CURL_MULTI
453 int num_transfers;
454
455 /* Wait for a slot to open up if the queue is full */
456 while (active_requests >= max_requests) {
457 curl_multi_perform(curlm, &num_transfers);
458 if (num_transfers < active_requests)
459 process_curl_messages();
460 }
461 #endif
462
463 while (slot != NULL && slot->in_use)
464 slot = slot->next;
465
466 if (slot == NULL) {
467 newslot = xmalloc(sizeof(*newslot));
468 newslot->curl = NULL;
469 newslot->in_use = 0;
470 newslot->next = NULL;
471
472 slot = active_queue_head;
473 if (slot == NULL) {
474 active_queue_head = newslot;
475 } else {
476 while (slot->next != NULL)
477 slot = slot->next;
478 slot->next = newslot;
479 }
480 slot = newslot;
481 }
482
483 if (slot->curl == NULL) {
484 #ifdef NO_CURL_EASY_DUPHANDLE
485 slot->curl = get_curl_handle();
486 #else
487 slot->curl = curl_easy_duphandle(curl_default);
488 #endif
489 curl_session_count++;
490 }
491
492 active_requests++;
493 slot->in_use = 1;
494 slot->results = NULL;
495 slot->finished = NULL;
496 slot->callback_data = NULL;
497 slot->callback_func = NULL;
498 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
499 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
500 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
501 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
502 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
503 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
504 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
505 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
506 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
507 if (http_auth.password)
508 init_curl_http_auth(slot->curl);
509
510 return slot;
511 }
512
513 int start_active_slot(struct active_request_slot *slot)
514 {
515 #ifdef USE_CURL_MULTI
516 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
517 int num_transfers;
518
519 if (curlm_result != CURLM_OK &&
520 curlm_result != CURLM_CALL_MULTI_PERFORM) {
521 active_requests--;
522 slot->in_use = 0;
523 return 0;
524 }
525
526 /*
527 * We know there must be something to do, since we just added
528 * something.
529 */
530 curl_multi_perform(curlm, &num_transfers);
531 #endif
532 return 1;
533 }
534
535 #ifdef USE_CURL_MULTI
536 struct fill_chain {
537 void *data;
538 int (*fill)(void *);
539 struct fill_chain *next;
540 };
541
542 static struct fill_chain *fill_cfg;
543
544 void add_fill_function(void *data, int (*fill)(void *))
545 {
546 struct fill_chain *new = xmalloc(sizeof(*new));
547 struct fill_chain **linkp = &fill_cfg;
548 new->data = data;
549 new->fill = fill;
550 new->next = NULL;
551 while (*linkp)
552 linkp = &(*linkp)->next;
553 *linkp = new;
554 }
555
556 void fill_active_slots(void)
557 {
558 struct active_request_slot *slot = active_queue_head;
559
560 while (active_requests < max_requests) {
561 struct fill_chain *fill;
562 for (fill = fill_cfg; fill; fill = fill->next)
563 if (fill->fill(fill->data))
564 break;
565
566 if (!fill)
567 break;
568 }
569
570 while (slot != NULL) {
571 if (!slot->in_use && slot->curl != NULL
572 && curl_session_count > min_curl_sessions) {
573 curl_easy_cleanup(slot->curl);
574 slot->curl = NULL;
575 curl_session_count--;
576 }
577 slot = slot->next;
578 }
579 }
580
581 void step_active_slots(void)
582 {
583 int num_transfers;
584 CURLMcode curlm_result;
585
586 do {
587 curlm_result = curl_multi_perform(curlm, &num_transfers);
588 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
589 if (num_transfers < active_requests) {
590 process_curl_messages();
591 fill_active_slots();
592 }
593 }
594 #endif
595
596 void run_active_slot(struct active_request_slot *slot)
597 {
598 #ifdef USE_CURL_MULTI
599 fd_set readfds;
600 fd_set writefds;
601 fd_set excfds;
602 int max_fd;
603 struct timeval select_timeout;
604 int finished = 0;
605
606 slot->finished = &finished;
607 while (!finished) {
608 step_active_slots();
609
610 if (slot->in_use) {
611 #if LIBCURL_VERSION_NUM >= 0x070f04
612 long curl_timeout;
613 curl_multi_timeout(curlm, &curl_timeout);
614 if (curl_timeout == 0) {
615 continue;
616 } else if (curl_timeout == -1) {
617 select_timeout.tv_sec = 0;
618 select_timeout.tv_usec = 50000;
619 } else {
620 select_timeout.tv_sec = curl_timeout / 1000;
621 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
622 }
623 #else
624 select_timeout.tv_sec = 0;
625 select_timeout.tv_usec = 50000;
626 #endif
627
628 max_fd = -1;
629 FD_ZERO(&readfds);
630 FD_ZERO(&writefds);
631 FD_ZERO(&excfds);
632 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
633
634 /*
635 * It can happen that curl_multi_timeout returns a pathologically
636 * long timeout when curl_multi_fdset returns no file descriptors
637 * to read. See commit message for more details.
638 */
639 if (max_fd < 0 &&
640 (select_timeout.tv_sec > 0 ||
641 select_timeout.tv_usec > 50000)) {
642 select_timeout.tv_sec = 0;
643 select_timeout.tv_usec = 50000;
644 }
645
646 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
647 }
648 }
649 #else
650 while (slot->in_use) {
651 slot->curl_result = curl_easy_perform(slot->curl);
652 finish_active_slot(slot);
653 }
654 #endif
655 }
656
657 static void closedown_active_slot(struct active_request_slot *slot)
658 {
659 active_requests--;
660 slot->in_use = 0;
661 }
662
663 static void release_active_slot(struct active_request_slot *slot)
664 {
665 closedown_active_slot(slot);
666 if (slot->curl && curl_session_count > min_curl_sessions) {
667 #ifdef USE_CURL_MULTI
668 curl_multi_remove_handle(curlm, slot->curl);
669 #endif
670 curl_easy_cleanup(slot->curl);
671 slot->curl = NULL;
672 curl_session_count--;
673 }
674 #ifdef USE_CURL_MULTI
675 fill_active_slots();
676 #endif
677 }
678
679 void finish_active_slot(struct active_request_slot *slot)
680 {
681 closedown_active_slot(slot);
682 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
683
684 if (slot->finished != NULL)
685 (*slot->finished) = 1;
686
687 /* Store slot results so they can be read after the slot is reused */
688 if (slot->results != NULL) {
689 slot->results->curl_result = slot->curl_result;
690 slot->results->http_code = slot->http_code;
691 }
692
693 /* Run callback if appropriate */
694 if (slot->callback_func != NULL)
695 slot->callback_func(slot->callback_data);
696 }
697
698 void finish_all_active_slots(void)
699 {
700 struct active_request_slot *slot = active_queue_head;
701
702 while (slot != NULL)
703 if (slot->in_use) {
704 run_active_slot(slot);
705 slot = active_queue_head;
706 } else {
707 slot = slot->next;
708 }
709 }
710
711 /* Helpers for modifying and creating URLs */
712 static inline int needs_quote(int ch)
713 {
714 if (((ch >= 'A') && (ch <= 'Z'))
715 || ((ch >= 'a') && (ch <= 'z'))
716 || ((ch >= '0') && (ch <= '9'))
717 || (ch == '/')
718 || (ch == '-')
719 || (ch == '.'))
720 return 0;
721 return 1;
722 }
723
724 static char *quote_ref_url(const char *base, const char *ref)
725 {
726 struct strbuf buf = STRBUF_INIT;
727 const char *cp;
728 int ch;
729
730 end_url_with_slash(&buf, base);
731
732 for (cp = ref; (ch = *cp) != 0; cp++)
733 if (needs_quote(ch))
734 strbuf_addf(&buf, "%%%02x", ch);
735 else
736 strbuf_addch(&buf, *cp);
737
738 return strbuf_detach(&buf, NULL);
739 }
740
741 void append_remote_object_url(struct strbuf *buf, const char *url,
742 const char *hex,
743 int only_two_digit_prefix)
744 {
745 end_url_with_slash(buf, url);
746
747 strbuf_addf(buf, "objects/%.*s/", 2, hex);
748 if (!only_two_digit_prefix)
749 strbuf_addf(buf, "%s", hex+2);
750 }
751
752 char *get_remote_object_url(const char *url, const char *hex,
753 int only_two_digit_prefix)
754 {
755 struct strbuf buf = STRBUF_INIT;
756 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
757 return strbuf_detach(&buf, NULL);
758 }
759
760 int handle_curl_result(struct slot_results *results)
761 {
762 if (results->curl_result == CURLE_OK) {
763 credential_approve(&http_auth);
764 return HTTP_OK;
765 } else if (missing_target(results))
766 return HTTP_MISSING_TARGET;
767 else if (results->http_code == 401) {
768 if (http_auth.username && http_auth.password) {
769 credential_reject(&http_auth);
770 return HTTP_NOAUTH;
771 } else {
772 credential_fill(&http_auth);
773 return HTTP_REAUTH;
774 }
775 } else {
776 #if LIBCURL_VERSION_NUM >= 0x070c00
777 if (!curl_errorstr[0])
778 strlcpy(curl_errorstr,
779 curl_easy_strerror(results->curl_result),
780 sizeof(curl_errorstr));
781 #endif
782 return HTTP_ERROR;
783 }
784 }
785
786 /* http_request() targets */
787 #define HTTP_REQUEST_STRBUF 0
788 #define HTTP_REQUEST_FILE 1
789
790 static int http_request(const char *url, void *result, int target, int options)
791 {
792 struct active_request_slot *slot;
793 struct slot_results results;
794 struct curl_slist *headers = NULL;
795 struct strbuf buf = STRBUF_INIT;
796 int ret;
797
798 slot = get_active_slot();
799 slot->results = &results;
800 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
801
802 if (result == NULL) {
803 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
804 } else {
805 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
806 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
807
808 if (target == HTTP_REQUEST_FILE) {
809 long posn = ftell(result);
810 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
811 fwrite);
812 if (posn > 0) {
813 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
814 headers = curl_slist_append(headers, buf.buf);
815 strbuf_reset(&buf);
816 }
817 } else
818 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
819 fwrite_buffer);
820 }
821
822 strbuf_addstr(&buf, "Pragma:");
823 if (options & HTTP_NO_CACHE)
824 strbuf_addstr(&buf, " no-cache");
825
826 headers = curl_slist_append(headers, buf.buf);
827
828 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
829 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
830 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
831
832 if (start_active_slot(slot)) {
833 run_active_slot(slot);
834 ret = handle_curl_result(&results);
835 } else {
836 error("Unable to start HTTP request for %s", url);
837 ret = HTTP_START_FAILED;
838 }
839
840 curl_slist_free_all(headers);
841 strbuf_release(&buf);
842
843 return ret;
844 }
845
846 static int http_request_reauth(const char *url, void *result, int target,
847 int options)
848 {
849 int ret = http_request(url, result, target, options);
850 if (ret != HTTP_REAUTH)
851 return ret;
852 return http_request(url, result, target, options);
853 }
854
855 int http_get_strbuf(const char *url, struct strbuf *result, int options)
856 {
857 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
858 }
859
860 /*
861 * Downloads a URL and stores the result in the given file.
862 *
863 * If a previous interrupted download is detected (i.e. a previous temporary
864 * file is still around) the download is resumed.
865 */
866 static int http_get_file(const char *url, const char *filename, int options)
867 {
868 int ret;
869 struct strbuf tmpfile = STRBUF_INIT;
870 FILE *result;
871
872 strbuf_addf(&tmpfile, "%s.temp", filename);
873 result = fopen(tmpfile.buf, "a");
874 if (! result) {
875 error("Unable to open local file %s", tmpfile.buf);
876 ret = HTTP_ERROR;
877 goto cleanup;
878 }
879
880 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
881 fclose(result);
882
883 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
884 ret = HTTP_ERROR;
885 cleanup:
886 strbuf_release(&tmpfile);
887 return ret;
888 }
889
890 int http_error(const char *url, int ret)
891 {
892 /* http_request has already handled HTTP_START_FAILED. */
893 if (ret != HTTP_START_FAILED)
894 error("%s while accessing %s", curl_errorstr, url);
895
896 return ret;
897 }
898
899 int http_fetch_ref(const char *base, struct ref *ref)
900 {
901 char *url;
902 struct strbuf buffer = STRBUF_INIT;
903 int ret = -1;
904
905 url = quote_ref_url(base, ref->name);
906 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
907 strbuf_rtrim(&buffer);
908 if (buffer.len == 40)
909 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
910 else if (!prefixcmp(buffer.buf, "ref: ")) {
911 ref->symref = xstrdup(buffer.buf + 5);
912 ret = 0;
913 }
914 }
915
916 strbuf_release(&buffer);
917 free(url);
918 return ret;
919 }
920
921 /* Helpers for fetching packs */
922 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
923 {
924 char *url, *tmp;
925 struct strbuf buf = STRBUF_INIT;
926
927 if (http_is_verbose)
928 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
929
930 end_url_with_slash(&buf, base_url);
931 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
932 url = strbuf_detach(&buf, NULL);
933
934 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
935 tmp = strbuf_detach(&buf, NULL);
936
937 if (http_get_file(url, tmp, 0) != HTTP_OK) {
938 error("Unable to get pack index %s", url);
939 free(tmp);
940 tmp = NULL;
941 }
942
943 free(url);
944 return tmp;
945 }
946
947 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
948 unsigned char *sha1, const char *base_url)
949 {
950 struct packed_git *new_pack;
951 char *tmp_idx = NULL;
952 int ret;
953
954 if (has_pack_index(sha1)) {
955 new_pack = parse_pack_index(sha1, NULL);
956 if (!new_pack)
957 return -1; /* parse_pack_index() already issued error message */
958 goto add_pack;
959 }
960
961 tmp_idx = fetch_pack_index(sha1, base_url);
962 if (!tmp_idx)
963 return -1;
964
965 new_pack = parse_pack_index(sha1, tmp_idx);
966 if (!new_pack) {
967 unlink(tmp_idx);
968 free(tmp_idx);
969
970 return -1; /* parse_pack_index() already issued error message */
971 }
972
973 ret = verify_pack_index(new_pack);
974 if (!ret) {
975 close_pack_index(new_pack);
976 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
977 }
978 free(tmp_idx);
979 if (ret)
980 return -1;
981
982 add_pack:
983 new_pack->next = *packs_head;
984 *packs_head = new_pack;
985 return 0;
986 }
987
988 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
989 {
990 int ret = 0, i = 0;
991 char *url, *data;
992 struct strbuf buf = STRBUF_INIT;
993 unsigned char sha1[20];
994
995 end_url_with_slash(&buf, base_url);
996 strbuf_addstr(&buf, "objects/info/packs");
997 url = strbuf_detach(&buf, NULL);
998
999 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1000 if (ret != HTTP_OK)
1001 goto cleanup;
1002
1003 data = buf.buf;
1004 while (i < buf.len) {
1005 switch (data[i]) {
1006 case 'P':
1007 i++;
1008 if (i + 52 <= buf.len &&
1009 !prefixcmp(data + i, " pack-") &&
1010 !prefixcmp(data + i + 46, ".pack\n")) {
1011 get_sha1_hex(data + i + 6, sha1);
1012 fetch_and_setup_pack_index(packs_head, sha1,
1013 base_url);
1014 i += 51;
1015 break;
1016 }
1017 default:
1018 while (i < buf.len && data[i] != '\n')
1019 i++;
1020 }
1021 i++;
1022 }
1023
1024 cleanup:
1025 free(url);
1026 return ret;
1027 }
1028
1029 void release_http_pack_request(struct http_pack_request *preq)
1030 {
1031 if (preq->packfile != NULL) {
1032 fclose(preq->packfile);
1033 preq->packfile = NULL;
1034 }
1035 if (preq->range_header != NULL) {
1036 curl_slist_free_all(preq->range_header);
1037 preq->range_header = NULL;
1038 }
1039 preq->slot = NULL;
1040 free(preq->url);
1041 }
1042
1043 int finish_http_pack_request(struct http_pack_request *preq)
1044 {
1045 struct packed_git **lst;
1046 struct packed_git *p = preq->target;
1047 char *tmp_idx;
1048 struct child_process ip;
1049 const char *ip_argv[8];
1050
1051 close_pack_index(p);
1052
1053 fclose(preq->packfile);
1054 preq->packfile = NULL;
1055
1056 lst = preq->lst;
1057 while (*lst != p)
1058 lst = &((*lst)->next);
1059 *lst = (*lst)->next;
1060
1061 tmp_idx = xstrdup(preq->tmpfile);
1062 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1063 ".idx.temp");
1064
1065 ip_argv[0] = "index-pack";
1066 ip_argv[1] = "-o";
1067 ip_argv[2] = tmp_idx;
1068 ip_argv[3] = preq->tmpfile;
1069 ip_argv[4] = NULL;
1070
1071 memset(&ip, 0, sizeof(ip));
1072 ip.argv = ip_argv;
1073 ip.git_cmd = 1;
1074 ip.no_stdin = 1;
1075 ip.no_stdout = 1;
1076
1077 if (run_command(&ip)) {
1078 unlink(preq->tmpfile);
1079 unlink(tmp_idx);
1080 free(tmp_idx);
1081 return -1;
1082 }
1083
1084 unlink(sha1_pack_index_name(p->sha1));
1085
1086 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1087 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1088 free(tmp_idx);
1089 return -1;
1090 }
1091
1092 install_packed_git(p);
1093 free(tmp_idx);
1094 return 0;
1095 }
1096
1097 struct http_pack_request *new_http_pack_request(
1098 struct packed_git *target, const char *base_url)
1099 {
1100 long prev_posn = 0;
1101 char range[RANGE_HEADER_SIZE];
1102 struct strbuf buf = STRBUF_INIT;
1103 struct http_pack_request *preq;
1104
1105 preq = xcalloc(1, sizeof(*preq));
1106 preq->target = target;
1107
1108 end_url_with_slash(&buf, base_url);
1109 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1110 sha1_to_hex(target->sha1));
1111 preq->url = strbuf_detach(&buf, NULL);
1112
1113 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1114 sha1_pack_name(target->sha1));
1115 preq->packfile = fopen(preq->tmpfile, "a");
1116 if (!preq->packfile) {
1117 error("Unable to open local file %s for pack",
1118 preq->tmpfile);
1119 goto abort;
1120 }
1121
1122 preq->slot = get_active_slot();
1123 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1124 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1125 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1126 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1127 no_pragma_header);
1128
1129 /*
1130 * If there is data present from a previous transfer attempt,
1131 * resume where it left off
1132 */
1133 prev_posn = ftell(preq->packfile);
1134 if (prev_posn>0) {
1135 if (http_is_verbose)
1136 fprintf(stderr,
1137 "Resuming fetch of pack %s at byte %ld\n",
1138 sha1_to_hex(target->sha1), prev_posn);
1139 sprintf(range, "Range: bytes=%ld-", prev_posn);
1140 preq->range_header = curl_slist_append(NULL, range);
1141 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1142 preq->range_header);
1143 }
1144
1145 return preq;
1146
1147 abort:
1148 free(preq->url);
1149 free(preq);
1150 return NULL;
1151 }
1152
1153 /* Helpers for fetching objects (loose) */
1154 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1155 void *data)
1156 {
1157 unsigned char expn[4096];
1158 size_t size = eltsize * nmemb;
1159 int posn = 0;
1160 struct http_object_request *freq =
1161 (struct http_object_request *)data;
1162 do {
1163 ssize_t retval = xwrite(freq->localfile,
1164 (char *) ptr + posn, size - posn);
1165 if (retval < 0)
1166 return posn;
1167 posn += retval;
1168 } while (posn < size);
1169
1170 freq->stream.avail_in = size;
1171 freq->stream.next_in = (void *)ptr;
1172 do {
1173 freq->stream.next_out = expn;
1174 freq->stream.avail_out = sizeof(expn);
1175 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1176 git_SHA1_Update(&freq->c, expn,
1177 sizeof(expn) - freq->stream.avail_out);
1178 } while (freq->stream.avail_in && freq->zret == Z_OK);
1179 return size;
1180 }
1181
1182 struct http_object_request *new_http_object_request(const char *base_url,
1183 unsigned char *sha1)
1184 {
1185 char *hex = sha1_to_hex(sha1);
1186 char *filename;
1187 char prevfile[PATH_MAX];
1188 int prevlocal;
1189 char prev_buf[PREV_BUF_SIZE];
1190 ssize_t prev_read = 0;
1191 long prev_posn = 0;
1192 char range[RANGE_HEADER_SIZE];
1193 struct curl_slist *range_header = NULL;
1194 struct http_object_request *freq;
1195
1196 freq = xcalloc(1, sizeof(*freq));
1197 hashcpy(freq->sha1, sha1);
1198 freq->localfile = -1;
1199
1200 filename = sha1_file_name(sha1);
1201 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1202 "%s.temp", filename);
1203
1204 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1205 unlink_or_warn(prevfile);
1206 rename(freq->tmpfile, prevfile);
1207 unlink_or_warn(freq->tmpfile);
1208
1209 if (freq->localfile != -1)
1210 error("fd leakage in start: %d", freq->localfile);
1211 freq->localfile = open(freq->tmpfile,
1212 O_WRONLY | O_CREAT | O_EXCL, 0666);
1213 /*
1214 * This could have failed due to the "lazy directory creation";
1215 * try to mkdir the last path component.
1216 */
1217 if (freq->localfile < 0 && errno == ENOENT) {
1218 char *dir = strrchr(freq->tmpfile, '/');
1219 if (dir) {
1220 *dir = 0;
1221 mkdir(freq->tmpfile, 0777);
1222 *dir = '/';
1223 }
1224 freq->localfile = open(freq->tmpfile,
1225 O_WRONLY | O_CREAT | O_EXCL, 0666);
1226 }
1227
1228 if (freq->localfile < 0) {
1229 error("Couldn't create temporary file %s: %s",
1230 freq->tmpfile, strerror(errno));
1231 goto abort;
1232 }
1233
1234 git_inflate_init(&freq->stream);
1235
1236 git_SHA1_Init(&freq->c);
1237
1238 freq->url = get_remote_object_url(base_url, hex, 0);
1239
1240 /*
1241 * If a previous temp file is present, process what was already
1242 * fetched.
1243 */
1244 prevlocal = open(prevfile, O_RDONLY);
1245 if (prevlocal != -1) {
1246 do {
1247 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1248 if (prev_read>0) {
1249 if (fwrite_sha1_file(prev_buf,
1250 1,
1251 prev_read,
1252 freq) == prev_read) {
1253 prev_posn += prev_read;
1254 } else {
1255 prev_read = -1;
1256 }
1257 }
1258 } while (prev_read > 0);
1259 close(prevlocal);
1260 }
1261 unlink_or_warn(prevfile);
1262
1263 /*
1264 * Reset inflate/SHA1 if there was an error reading the previous temp
1265 * file; also rewind to the beginning of the local file.
1266 */
1267 if (prev_read == -1) {
1268 memset(&freq->stream, 0, sizeof(freq->stream));
1269 git_inflate_init(&freq->stream);
1270 git_SHA1_Init(&freq->c);
1271 if (prev_posn>0) {
1272 prev_posn = 0;
1273 lseek(freq->localfile, 0, SEEK_SET);
1274 if (ftruncate(freq->localfile, 0) < 0) {
1275 error("Couldn't truncate temporary file %s: %s",
1276 freq->tmpfile, strerror(errno));
1277 goto abort;
1278 }
1279 }
1280 }
1281
1282 freq->slot = get_active_slot();
1283
1284 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1285 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1286 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1287 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1288 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1289
1290 /*
1291 * If we have successfully processed data from a previous fetch
1292 * attempt, only fetch the data we don't already have.
1293 */
1294 if (prev_posn>0) {
1295 if (http_is_verbose)
1296 fprintf(stderr,
1297 "Resuming fetch of object %s at byte %ld\n",
1298 hex, prev_posn);
1299 sprintf(range, "Range: bytes=%ld-", prev_posn);
1300 range_header = curl_slist_append(range_header, range);
1301 curl_easy_setopt(freq->slot->curl,
1302 CURLOPT_HTTPHEADER, range_header);
1303 }
1304
1305 return freq;
1306
1307 abort:
1308 free(freq->url);
1309 free(freq);
1310 return NULL;
1311 }
1312
1313 void process_http_object_request(struct http_object_request *freq)
1314 {
1315 if (freq->slot == NULL)
1316 return;
1317 freq->curl_result = freq->slot->curl_result;
1318 freq->http_code = freq->slot->http_code;
1319 freq->slot = NULL;
1320 }
1321
1322 int finish_http_object_request(struct http_object_request *freq)
1323 {
1324 struct stat st;
1325
1326 close(freq->localfile);
1327 freq->localfile = -1;
1328
1329 process_http_object_request(freq);
1330
1331 if (freq->http_code == 416) {
1332 warning("requested range invalid; we may already have all the data.");
1333 } else if (freq->curl_result != CURLE_OK) {
1334 if (stat(freq->tmpfile, &st) == 0)
1335 if (st.st_size == 0)
1336 unlink_or_warn(freq->tmpfile);
1337 return -1;
1338 }
1339
1340 git_inflate_end(&freq->stream);
1341 git_SHA1_Final(freq->real_sha1, &freq->c);
1342 if (freq->zret != Z_STREAM_END) {
1343 unlink_or_warn(freq->tmpfile);
1344 return -1;
1345 }
1346 if (hashcmp(freq->sha1, freq->real_sha1)) {
1347 unlink_or_warn(freq->tmpfile);
1348 return -1;
1349 }
1350 freq->rename =
1351 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1352
1353 return freq->rename;
1354 }
1355
1356 void abort_http_object_request(struct http_object_request *freq)
1357 {
1358 unlink_or_warn(freq->tmpfile);
1359
1360 release_http_object_request(freq);
1361 }
1362
1363 void release_http_object_request(struct http_object_request *freq)
1364 {
1365 if (freq->localfile != -1) {
1366 close(freq->localfile);
1367 freq->localfile = -1;
1368 }
1369 if (freq->url != NULL) {
1370 free(freq->url);
1371 freq->url = NULL;
1372 }
1373 if (freq->slot != NULL) {
1374 freq->slot->callback_func = NULL;
1375 freq->slot->callback_data = NULL;
1376 release_active_slot(freq->slot);
1377 freq->slot = NULL;
1378 }
1379 }
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