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log and friends: --second-parent
[git/mjg.git] / http.c
blob8803c70825ac8aefb619b6c56d6015573eb5d227
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 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 return HTTP_REAUTH;
776 }
777 } else {
778 #if LIBCURL_VERSION_NUM >= 0x070c00
779 if (!curl_errorstr[0])
780 strlcpy(curl_errorstr,
781 curl_easy_strerror(results->curl_result),
782 sizeof(curl_errorstr));
783 #endif
784 return HTTP_ERROR;
785 }
786 }
787
788 /* http_request() targets */
789 #define HTTP_REQUEST_STRBUF 0
790 #define HTTP_REQUEST_FILE 1
791
792 static int http_request(const char *url, struct strbuf *type,
793 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(&results);
838 } else {
839 error("Unable to start HTTP request for %s", url);
840 ret = HTTP_START_FAILED;
841 }
842
843 if (type) {
844 char *t;
845 strbuf_reset(type);
846 curl_easy_getinfo(slot->curl, CURLINFO_CONTENT_TYPE, &t);
847 if (t)
848 strbuf_addstr(type, t);
849 }
850
851 curl_slist_free_all(headers);
852 strbuf_release(&buf);
853
854 return ret;
855 }
856
857 static int http_request_reauth(const char *url,
858 struct strbuf *type,
859 void *result, int target,
860 int options)
861 {
862 int ret = http_request(url, type, result, target, options);
863 if (ret != HTTP_REAUTH)
864 return ret;
865 return http_request(url, type, result, target, options);
866 }
867
868 int http_get_strbuf(const char *url,
869 struct strbuf *type,
870 struct strbuf *result, int options)
871 {
872 return http_request_reauth(url, type, result,
873 HTTP_REQUEST_STRBUF, options);
874 }
875
876 /*
877 * Downloads a URL and stores the result in the given file.
878 *
879 * If a previous interrupted download is detected (i.e. a previous temporary
880 * file is still around) the download is resumed.
881 */
882 static int http_get_file(const char *url, const char *filename, int options)
883 {
884 int ret;
885 struct strbuf tmpfile = STRBUF_INIT;
886 FILE *result;
887
888 strbuf_addf(&tmpfile, "%s.temp", filename);
889 result = fopen(tmpfile.buf, "a");
890 if (! result) {
891 error("Unable to open local file %s", tmpfile.buf);
892 ret = HTTP_ERROR;
893 goto cleanup;
894 }
895
896 ret = http_request_reauth(url, NULL, result, HTTP_REQUEST_FILE, options);
897 fclose(result);
898
899 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
900 ret = HTTP_ERROR;
901 cleanup:
902 strbuf_release(&tmpfile);
903 return ret;
904 }
905
906 int http_error(const char *url, int ret)
907 {
908 /* http_request has already handled HTTP_START_FAILED. */
909 if (ret != HTTP_START_FAILED)
910 error("%s while accessing %s", curl_errorstr, url);
911
912 return ret;
913 }
914
915 int http_fetch_ref(const char *base, struct ref *ref)
916 {
917 char *url;
918 struct strbuf buffer = STRBUF_INIT;
919 int ret = -1;
920
921 url = quote_ref_url(base, ref->name);
922 if (http_get_strbuf(url, NULL, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
923 strbuf_rtrim(&buffer);
924 if (buffer.len == 40)
925 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
926 else if (!prefixcmp(buffer.buf, "ref: ")) {
927 ref->symref = xstrdup(buffer.buf + 5);
928 ret = 0;
929 }
930 }
931
932 strbuf_release(&buffer);
933 free(url);
934 return ret;
935 }
936
937 /* Helpers for fetching packs */
938 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
939 {
940 char *url, *tmp;
941 struct strbuf buf = STRBUF_INIT;
942
943 if (http_is_verbose)
944 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
945
946 end_url_with_slash(&buf, base_url);
947 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
948 url = strbuf_detach(&buf, NULL);
949
950 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
951 tmp = strbuf_detach(&buf, NULL);
952
953 if (http_get_file(url, tmp, 0) != HTTP_OK) {
954 error("Unable to get pack index %s", url);
955 free(tmp);
956 tmp = NULL;
957 }
958
959 free(url);
960 return tmp;
961 }
962
963 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
964 unsigned char *sha1, const char *base_url)
965 {
966 struct packed_git *new_pack;
967 char *tmp_idx = NULL;
968 int ret;
969
970 if (has_pack_index(sha1)) {
971 new_pack = parse_pack_index(sha1, NULL);
972 if (!new_pack)
973 return -1; /* parse_pack_index() already issued error message */
974 goto add_pack;
975 }
976
977 tmp_idx = fetch_pack_index(sha1, base_url);
978 if (!tmp_idx)
979 return -1;
980
981 new_pack = parse_pack_index(sha1, tmp_idx);
982 if (!new_pack) {
983 unlink(tmp_idx);
984 free(tmp_idx);
985
986 return -1; /* parse_pack_index() already issued error message */
987 }
988
989 ret = verify_pack_index(new_pack);
990 if (!ret) {
991 close_pack_index(new_pack);
992 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
993 }
994 free(tmp_idx);
995 if (ret)
996 return -1;
997
998 add_pack:
999 new_pack->next = *packs_head;
1000 *packs_head = new_pack;
1001 return 0;
1002 }
1003
1004 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1005 {
1006 int ret = 0, i = 0;
1007 char *url, *data;
1008 struct strbuf buf = STRBUF_INIT;
1009 unsigned char sha1[20];
1010
1011 end_url_with_slash(&buf, base_url);
1012 strbuf_addstr(&buf, "objects/info/packs");
1013 url = strbuf_detach(&buf, NULL);
1014
1015 ret = http_get_strbuf(url, NULL, &buf, HTTP_NO_CACHE);
1016 if (ret != HTTP_OK)
1017 goto cleanup;
1018
1019 data = buf.buf;
1020 while (i < buf.len) {
1021 switch (data[i]) {
1022 case 'P':
1023 i++;
1024 if (i + 52 <= buf.len &&
1025 !prefixcmp(data + i, " pack-") &&
1026 !prefixcmp(data + i + 46, ".pack\n")) {
1027 get_sha1_hex(data + i + 6, sha1);
1028 fetch_and_setup_pack_index(packs_head, sha1,
1029 base_url);
1030 i += 51;
1031 break;
1032 }
1033 default:
1034 while (i < buf.len && data[i] != '\n')
1035 i++;
1036 }
1037 i++;
1038 }
1039
1040 cleanup:
1041 free(url);
1042 return ret;
1043 }
1044
1045 void release_http_pack_request(struct http_pack_request *preq)
1046 {
1047 if (preq->packfile != NULL) {
1048 fclose(preq->packfile);
1049 preq->packfile = NULL;
1050 }
1051 if (preq->range_header != NULL) {
1052 curl_slist_free_all(preq->range_header);
1053 preq->range_header = NULL;
1054 }
1055 preq->slot = NULL;
1056 free(preq->url);
1057 }
1058
1059 int finish_http_pack_request(struct http_pack_request *preq)
1060 {
1061 struct packed_git **lst;
1062 struct packed_git *p = preq->target;
1063 char *tmp_idx;
1064 struct child_process ip;
1065 const char *ip_argv[8];
1066
1067 close_pack_index(p);
1068
1069 fclose(preq->packfile);
1070 preq->packfile = NULL;
1071
1072 lst = preq->lst;
1073 while (*lst != p)
1074 lst = &((*lst)->next);
1075 *lst = (*lst)->next;
1076
1077 tmp_idx = xstrdup(preq->tmpfile);
1078 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1079 ".idx.temp");
1080
1081 ip_argv[0] = "index-pack";
1082 ip_argv[1] = "-o";
1083 ip_argv[2] = tmp_idx;
1084 ip_argv[3] = preq->tmpfile;
1085 ip_argv[4] = NULL;
1086
1087 memset(&ip, 0, sizeof(ip));
1088 ip.argv = ip_argv;
1089 ip.git_cmd = 1;
1090 ip.no_stdin = 1;
1091 ip.no_stdout = 1;
1092
1093 if (run_command(&ip)) {
1094 unlink(preq->tmpfile);
1095 unlink(tmp_idx);
1096 free(tmp_idx);
1097 return -1;
1098 }
1099
1100 unlink(sha1_pack_index_name(p->sha1));
1101
1102 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1103 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1104 free(tmp_idx);
1105 return -1;
1106 }
1107
1108 install_packed_git(p);
1109 free(tmp_idx);
1110 return 0;
1111 }
1112
1113 struct http_pack_request *new_http_pack_request(
1114 struct packed_git *target, const char *base_url)
1115 {
1116 long prev_posn = 0;
1117 char range[RANGE_HEADER_SIZE];
1118 struct strbuf buf = STRBUF_INIT;
1119 struct http_pack_request *preq;
1120
1121 preq = xcalloc(1, sizeof(*preq));
1122 preq->target = target;
1123
1124 end_url_with_slash(&buf, base_url);
1125 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1126 sha1_to_hex(target->sha1));
1127 preq->url = strbuf_detach(&buf, NULL);
1128
1129 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1130 sha1_pack_name(target->sha1));
1131 preq->packfile = fopen(preq->tmpfile, "a");
1132 if (!preq->packfile) {
1133 error("Unable to open local file %s for pack",
1134 preq->tmpfile);
1135 goto abort;
1136 }
1137
1138 preq->slot = get_active_slot();
1139 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1140 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1141 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1142 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1143 no_pragma_header);
1144
1145 /*
1146 * If there is data present from a previous transfer attempt,
1147 * resume where it left off
1148 */
1149 prev_posn = ftell(preq->packfile);
1150 if (prev_posn>0) {
1151 if (http_is_verbose)
1152 fprintf(stderr,
1153 "Resuming fetch of pack %s at byte %ld\n",
1154 sha1_to_hex(target->sha1), prev_posn);
1155 sprintf(range, "Range: bytes=%ld-", prev_posn);
1156 preq->range_header = curl_slist_append(NULL, range);
1157 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1158 preq->range_header);
1159 }
1160
1161 return preq;
1162
1163 abort:
1164 free(preq->url);
1165 free(preq);
1166 return NULL;
1167 }
1168
1169 /* Helpers for fetching objects (loose) */
1170 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1171 void *data)
1172 {
1173 unsigned char expn[4096];
1174 size_t size = eltsize * nmemb;
1175 int posn = 0;
1176 struct http_object_request *freq =
1177 (struct http_object_request *)data;
1178 do {
1179 ssize_t retval = xwrite(freq->localfile,
1180 (char *) ptr + posn, size - posn);
1181 if (retval < 0)
1182 return posn;
1183 posn += retval;
1184 } while (posn < size);
1185
1186 freq->stream.avail_in = size;
1187 freq->stream.next_in = (void *)ptr;
1188 do {
1189 freq->stream.next_out = expn;
1190 freq->stream.avail_out = sizeof(expn);
1191 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1192 git_SHA1_Update(&freq->c, expn,
1193 sizeof(expn) - freq->stream.avail_out);
1194 } while (freq->stream.avail_in && freq->zret == Z_OK);
1195 return size;
1196 }
1197
1198 struct http_object_request *new_http_object_request(const char *base_url,
1199 unsigned char *sha1)
1200 {
1201 char *hex = sha1_to_hex(sha1);
1202 char *filename;
1203 char prevfile[PATH_MAX];
1204 int prevlocal;
1205 char prev_buf[PREV_BUF_SIZE];
1206 ssize_t prev_read = 0;
1207 long prev_posn = 0;
1208 char range[RANGE_HEADER_SIZE];
1209 struct curl_slist *range_header = NULL;
1210 struct http_object_request *freq;
1211
1212 freq = xcalloc(1, sizeof(*freq));
1213 hashcpy(freq->sha1, sha1);
1214 freq->localfile = -1;
1215
1216 filename = sha1_file_name(sha1);
1217 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1218 "%s.temp", filename);
1219
1220 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1221 unlink_or_warn(prevfile);
1222 rename(freq->tmpfile, prevfile);
1223 unlink_or_warn(freq->tmpfile);
1224
1225 if (freq->localfile != -1)
1226 error("fd leakage in start: %d", freq->localfile);
1227 freq->localfile = open(freq->tmpfile,
1228 O_WRONLY | O_CREAT | O_EXCL, 0666);
1229 /*
1230 * This could have failed due to the "lazy directory creation";
1231 * try to mkdir the last path component.
1232 */
1233 if (freq->localfile < 0 && errno == ENOENT) {
1234 char *dir = strrchr(freq->tmpfile, '/');
1235 if (dir) {
1236 *dir = 0;
1237 mkdir(freq->tmpfile, 0777);
1238 *dir = '/';
1239 }
1240 freq->localfile = open(freq->tmpfile,
1241 O_WRONLY | O_CREAT | O_EXCL, 0666);
1242 }
1243
1244 if (freq->localfile < 0) {
1245 error("Couldn't create temporary file %s: %s",
1246 freq->tmpfile, strerror(errno));
1247 goto abort;
1248 }
1249
1250 git_inflate_init(&freq->stream);
1251
1252 git_SHA1_Init(&freq->c);
1253
1254 freq->url = get_remote_object_url(base_url, hex, 0);
1255
1256 /*
1257 * If a previous temp file is present, process what was already
1258 * fetched.
1259 */
1260 prevlocal = open(prevfile, O_RDONLY);
1261 if (prevlocal != -1) {
1262 do {
1263 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1264 if (prev_read>0) {
1265 if (fwrite_sha1_file(prev_buf,
1266 1,
1267 prev_read,
1268 freq) == prev_read) {
1269 prev_posn += prev_read;
1270 } else {
1271 prev_read = -1;
1272 }
1273 }
1274 } while (prev_read > 0);
1275 close(prevlocal);
1276 }
1277 unlink_or_warn(prevfile);
1278
1279 /*
1280 * Reset inflate/SHA1 if there was an error reading the previous temp
1281 * file; also rewind to the beginning of the local file.
1282 */
1283 if (prev_read == -1) {
1284 memset(&freq->stream, 0, sizeof(freq->stream));
1285 git_inflate_init(&freq->stream);
1286 git_SHA1_Init(&freq->c);
1287 if (prev_posn>0) {
1288 prev_posn = 0;
1289 lseek(freq->localfile, 0, SEEK_SET);
1290 if (ftruncate(freq->localfile, 0) < 0) {
1291 error("Couldn't truncate temporary file %s: %s",
1292 freq->tmpfile, strerror(errno));
1293 goto abort;
1294 }
1295 }
1296 }
1297
1298 freq->slot = get_active_slot();
1299
1300 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1301 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1302 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1303 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1304 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1305
1306 /*
1307 * If we have successfully processed data from a previous fetch
1308 * attempt, only fetch the data we don't already have.
1309 */
1310 if (prev_posn>0) {
1311 if (http_is_verbose)
1312 fprintf(stderr,
1313 "Resuming fetch of object %s at byte %ld\n",
1314 hex, prev_posn);
1315 sprintf(range, "Range: bytes=%ld-", prev_posn);
1316 range_header = curl_slist_append(range_header, range);
1317 curl_easy_setopt(freq->slot->curl,
1318 CURLOPT_HTTPHEADER, range_header);
1319 }
1320
1321 return freq;
1322
1323 abort:
1324 free(freq->url);
1325 free(freq);
1326 return NULL;
1327 }
1328
1329 void process_http_object_request(struct http_object_request *freq)
1330 {
1331 if (freq->slot == NULL)
1332 return;
1333 freq->curl_result = freq->slot->curl_result;
1334 freq->http_code = freq->slot->http_code;
1335 freq->slot = NULL;
1336 }
1337
1338 int finish_http_object_request(struct http_object_request *freq)
1339 {
1340 struct stat st;
1341
1342 close(freq->localfile);
1343 freq->localfile = -1;
1344
1345 process_http_object_request(freq);
1346
1347 if (freq->http_code == 416) {
1348 warning("requested range invalid; we may already have all the data.");
1349 } else if (freq->curl_result != CURLE_OK) {
1350 if (stat(freq->tmpfile, &st) == 0)
1351 if (st.st_size == 0)
1352 unlink_or_warn(freq->tmpfile);
1353 return -1;
1354 }
1355
1356 git_inflate_end(&freq->stream);
1357 git_SHA1_Final(freq->real_sha1, &freq->c);
1358 if (freq->zret != Z_STREAM_END) {
1359 unlink_or_warn(freq->tmpfile);
1360 return -1;
1361 }
1362 if (hashcmp(freq->sha1, freq->real_sha1)) {
1363 unlink_or_warn(freq->tmpfile);
1364 return -1;
1365 }
1366 freq->rename =
1367 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1368
1369 return freq->rename;
1370 }
1371
1372 void abort_http_object_request(struct http_object_request *freq)
1373 {
1374 unlink_or_warn(freq->tmpfile);
1375
1376 release_http_object_request(freq);
1377 }
1378
1379 void release_http_object_request(struct http_object_request *freq)
1380 {
1381 if (freq->localfile != -1) {
1382 close(freq->localfile);
1383 freq->localfile = -1;
1384 }
1385 if (freq->url != NULL) {
1386 free(freq->url);
1387 freq->url = NULL;
1388 }
1389 if (freq->slot != NULL) {
1390 freq->slot->callback_func = NULL;
1391 freq->slot->callback_data = NULL;
1392 release_active_slot(freq->slot);
1393 freq->slot = NULL;
1394 }
1395 }
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