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show: fix "range implies walking"
[git/mjg.git] / http.c
blob5a1047345997cf35c40cfff5420f5519958257c3
1 #include "http.h"
2 #include "pack.h"
3 #include "sideband.h"
4 #include "run-command.h"
5 #include "url.h"
6
7 int active_requests;
8 int http_is_verbose;
9 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
10
11 #if LIBCURL_VERSION_NUM >= 0x070a06
12 #define LIBCURL_CAN_HANDLE_AUTH_ANY
13 #endif
14
15 static int min_curl_sessions = 1;
16 static int curl_session_count;
17 #ifdef USE_CURL_MULTI
18 static int max_requests = -1;
19 static CURLM *curlm;
20 #endif
21 #ifndef NO_CURL_EASY_DUPHANDLE
22 static CURL *curl_default;
23 #endif
24
25 #define PREV_BUF_SIZE 4096
26 #define RANGE_HEADER_SIZE 30
27
28 char curl_errorstr[CURL_ERROR_SIZE];
29
30 static int curl_ssl_verify = -1;
31 static const char *ssl_cert;
32 #if LIBCURL_VERSION_NUM >= 0x070903
33 static const char *ssl_key;
34 #endif
35 #if LIBCURL_VERSION_NUM >= 0x070908
36 static const char *ssl_capath;
37 #endif
38 static const char *ssl_cainfo;
39 static long curl_low_speed_limit = -1;
40 static long curl_low_speed_time = -1;
41 static int curl_ftp_no_epsv;
42 static const char *curl_http_proxy;
43 static const char *curl_cookie_file;
44 static char *user_name, *user_pass, *description;
45 static int http_proactive_auth;
46 static const char *user_agent;
47
48 #if LIBCURL_VERSION_NUM >= 0x071700
49 /* Use CURLOPT_KEYPASSWD as is */
50 #elif LIBCURL_VERSION_NUM >= 0x070903
51 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
52 #else
53 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
54 #endif
55
56 static char *ssl_cert_password;
57 static int ssl_cert_password_required;
58
59 static struct curl_slist *pragma_header;
60 static struct curl_slist *no_pragma_header;
61
62 static struct active_request_slot *active_queue_head;
63
64 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
65 {
66 size_t size = eltsize * nmemb;
67 struct buffer *buffer = buffer_;
68
69 if (size > buffer->buf.len - buffer->posn)
70 size = buffer->buf.len - buffer->posn;
71 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
72 buffer->posn += size;
73
74 return size;
75 }
76
77 #ifndef NO_CURL_IOCTL
78 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
79 {
80 struct buffer *buffer = clientp;
81
82 switch (cmd) {
83 case CURLIOCMD_NOP:
84 return CURLIOE_OK;
85
86 case CURLIOCMD_RESTARTREAD:
87 buffer->posn = 0;
88 return CURLIOE_OK;
89
90 default:
91 return CURLIOE_UNKNOWNCMD;
92 }
93 }
94 #endif
95
96 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
97 {
98 size_t size = eltsize * nmemb;
99 struct strbuf *buffer = buffer_;
100
101 strbuf_add(buffer, ptr, size);
102 return size;
103 }
104
105 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
106 {
107 return eltsize * nmemb;
108 }
109
110 #ifdef USE_CURL_MULTI
111 static void process_curl_messages(void)
112 {
113 int num_messages;
114 struct active_request_slot *slot;
115 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
116
117 while (curl_message != NULL) {
118 if (curl_message->msg == CURLMSG_DONE) {
119 int curl_result = curl_message->data.result;
120 slot = active_queue_head;
121 while (slot != NULL &&
122 slot->curl != curl_message->easy_handle)
123 slot = slot->next;
124 if (slot != NULL) {
125 curl_multi_remove_handle(curlm, slot->curl);
126 slot->curl_result = curl_result;
127 finish_active_slot(slot);
128 } else {
129 fprintf(stderr, "Received DONE message for unknown request!\n");
130 }
131 } else {
132 fprintf(stderr, "Unknown CURL message received: %d\n",
133 (int)curl_message->msg);
134 }
135 curl_message = curl_multi_info_read(curlm, &num_messages);
136 }
137 }
138 #endif
139
140 static char *git_getpass_with_description(const char *what, const char *desc)
141 {
142 struct strbuf prompt = STRBUF_INIT;
143 char *r;
144
145 if (desc)
146 strbuf_addf(&prompt, "%s for '%s': ", what, desc);
147 else
148 strbuf_addf(&prompt, "%s: ", what);
149 /*
150 * NEEDSWORK: for usernames, we should do something less magical that
151 * actually echoes the characters. However, we need to read from
152 * /dev/tty and not stdio, which is not portable (but getpass will do
153 * it for us). http.c uses the same workaround.
154 */
155 r = git_getpass(prompt.buf);
156
157 strbuf_release(&prompt);
158 return xstrdup(r);
159 }
160
161 static int http_options(const char *var, const char *value, void *cb)
162 {
163 if (!strcmp("http.sslverify", var)) {
164 curl_ssl_verify = git_config_bool(var, value);
165 return 0;
166 }
167 if (!strcmp("http.sslcert", var))
168 return git_config_string(&ssl_cert, var, value);
169 #if LIBCURL_VERSION_NUM >= 0x070903
170 if (!strcmp("http.sslkey", var))
171 return git_config_string(&ssl_key, var, value);
172 #endif
173 #if LIBCURL_VERSION_NUM >= 0x070908
174 if (!strcmp("http.sslcapath", var))
175 return git_config_string(&ssl_capath, var, value);
176 #endif
177 if (!strcmp("http.sslcainfo", var))
178 return git_config_string(&ssl_cainfo, var, value);
179 if (!strcmp("http.sslcertpasswordprotected", var)) {
180 if (git_config_bool(var, value))
181 ssl_cert_password_required = 1;
182 return 0;
183 }
184 if (!strcmp("http.minsessions", var)) {
185 min_curl_sessions = git_config_int(var, value);
186 #ifndef USE_CURL_MULTI
187 if (min_curl_sessions > 1)
188 min_curl_sessions = 1;
189 #endif
190 return 0;
191 }
192 #ifdef USE_CURL_MULTI
193 if (!strcmp("http.maxrequests", var)) {
194 max_requests = git_config_int(var, value);
195 return 0;
196 }
197 #endif
198 if (!strcmp("http.lowspeedlimit", var)) {
199 curl_low_speed_limit = (long)git_config_int(var, value);
200 return 0;
201 }
202 if (!strcmp("http.lowspeedtime", var)) {
203 curl_low_speed_time = (long)git_config_int(var, value);
204 return 0;
205 }
206
207 if (!strcmp("http.noepsv", var)) {
208 curl_ftp_no_epsv = git_config_bool(var, value);
209 return 0;
210 }
211 if (!strcmp("http.proxy", var))
212 return git_config_string(&curl_http_proxy, var, value);
213
214 if (!strcmp("http.cookiefile", var))
215 return git_config_string(&curl_cookie_file, var, value);
216
217 if (!strcmp("http.postbuffer", var)) {
218 http_post_buffer = git_config_int(var, value);
219 if (http_post_buffer < LARGE_PACKET_MAX)
220 http_post_buffer = LARGE_PACKET_MAX;
221 return 0;
222 }
223
224 if (!strcmp("http.useragent", var))
225 return git_config_string(&user_agent, var, value);
226
227 /* Fall back on the default ones */
228 return git_default_config(var, value, cb);
229 }
230
231 static void init_curl_http_auth(CURL *result)
232 {
233 if (user_name) {
234 struct strbuf up = STRBUF_INIT;
235 if (!user_pass)
236 user_pass = xstrdup(git_getpass_with_description("Password", description));
237 strbuf_addf(&up, "%s:%s", user_name, user_pass);
238 curl_easy_setopt(result, CURLOPT_USERPWD,
239 strbuf_detach(&up, NULL));
240 }
241 }
242
243 static int has_cert_password(void)
244 {
245 if (ssl_cert_password != NULL)
246 return 1;
247 if (ssl_cert == NULL || ssl_cert_password_required != 1)
248 return 0;
249 /* Only prompt the user once. */
250 ssl_cert_password_required = -1;
251 ssl_cert_password = git_getpass_with_description("Certificate Password", description);
252 if (ssl_cert_password != NULL) {
253 ssl_cert_password = xstrdup(ssl_cert_password);
254 return 1;
255 } else
256 return 0;
257 }
258
259 static CURL *get_curl_handle(void)
260 {
261 CURL *result = curl_easy_init();
262
263 if (!curl_ssl_verify) {
264 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
265 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
266 } else {
267 /* Verify authenticity of the peer's certificate */
268 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
269 /* The name in the cert must match whom we tried to connect */
270 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
271 }
272
273 #if LIBCURL_VERSION_NUM >= 0x070907
274 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
275 #endif
276 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
277 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
278 #endif
279
280 if (http_proactive_auth)
281 init_curl_http_auth(result);
282
283 if (ssl_cert != NULL)
284 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
285 if (has_cert_password())
286 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
287 #if LIBCURL_VERSION_NUM >= 0x070903
288 if (ssl_key != NULL)
289 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
290 #endif
291 #if LIBCURL_VERSION_NUM >= 0x070908
292 if (ssl_capath != NULL)
293 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
294 #endif
295 if (ssl_cainfo != NULL)
296 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
297 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
298
299 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
300 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
301 curl_low_speed_limit);
302 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
303 curl_low_speed_time);
304 }
305
306 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
307 #if LIBCURL_VERSION_NUM >= 0x071301
308 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
309 #elif LIBCURL_VERSION_NUM >= 0x071101
310 curl_easy_setopt(result, CURLOPT_POST301, 1);
311 #endif
312
313 if (getenv("GIT_CURL_VERBOSE"))
314 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
315
316 curl_easy_setopt(result, CURLOPT_USERAGENT,
317 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
318
319 if (curl_ftp_no_epsv)
320 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
321
322 if (curl_http_proxy)
323 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
324
325 return result;
326 }
327
328 static void http_auth_init(const char *url)
329 {
330 const char *at, *colon, *cp, *slash, *host;
331
332 cp = strstr(url, "://");
333 if (!cp)
334 return;
335
336 /*
337 * Ok, the URL looks like "proto://something". Which one?
338 * "proto://<user>:<pass>@<host>/...",
339 * "proto://<user>@<host>/...", or just
340 * "proto://<host>/..."?
341 */
342 cp += 3;
343 at = strchr(cp, '@');
344 colon = strchr(cp, ':');
345 slash = strchrnul(cp, '/');
346 if (!at || slash <= at) {
347 /* No credentials, but we may have to ask for some later */
348 host = cp;
349 }
350 else if (!colon || at <= colon) {
351 /* Only username */
352 user_name = url_decode_mem(cp, at - cp);
353 user_pass = NULL;
354 host = at + 1;
355 } else {
356 user_name = url_decode_mem(cp, colon - cp);
357 user_pass = url_decode_mem(colon + 1, at - (colon + 1));
358 host = at + 1;
359 }
360
361 description = url_decode_mem(host, slash - host);
362 }
363
364 static void set_from_env(const char **var, const char *envname)
365 {
366 const char *val = getenv(envname);
367 if (val)
368 *var = val;
369 }
370
371 void http_init(struct remote *remote, const char *url, int proactive_auth)
372 {
373 char *low_speed_limit;
374 char *low_speed_time;
375
376 http_is_verbose = 0;
377
378 git_config(http_options, NULL);
379
380 curl_global_init(CURL_GLOBAL_ALL);
381
382 http_proactive_auth = proactive_auth;
383
384 if (remote && remote->http_proxy)
385 curl_http_proxy = xstrdup(remote->http_proxy);
386
387 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
388 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
389
390 #ifdef USE_CURL_MULTI
391 {
392 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
393 if (http_max_requests != NULL)
394 max_requests = atoi(http_max_requests);
395 }
396
397 curlm = curl_multi_init();
398 if (curlm == NULL) {
399 fprintf(stderr, "Error creating curl multi handle.\n");
400 exit(1);
401 }
402 #endif
403
404 if (getenv("GIT_SSL_NO_VERIFY"))
405 curl_ssl_verify = 0;
406
407 set_from_env(&ssl_cert, "GIT_SSL_CERT");
408 #if LIBCURL_VERSION_NUM >= 0x070903
409 set_from_env(&ssl_key, "GIT_SSL_KEY");
410 #endif
411 #if LIBCURL_VERSION_NUM >= 0x070908
412 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
413 #endif
414 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
415
416 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
417
418 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
419 if (low_speed_limit != NULL)
420 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
421 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
422 if (low_speed_time != NULL)
423 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
424
425 if (curl_ssl_verify == -1)
426 curl_ssl_verify = 1;
427
428 curl_session_count = 0;
429 #ifdef USE_CURL_MULTI
430 if (max_requests < 1)
431 max_requests = DEFAULT_MAX_REQUESTS;
432 #endif
433
434 if (getenv("GIT_CURL_FTP_NO_EPSV"))
435 curl_ftp_no_epsv = 1;
436
437 if (url) {
438 http_auth_init(url);
439 if (!ssl_cert_password_required &&
440 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
441 !prefixcmp(url, "https://"))
442 ssl_cert_password_required = 1;
443 }
444
445 #ifndef NO_CURL_EASY_DUPHANDLE
446 curl_default = get_curl_handle();
447 #endif
448 }
449
450 void http_cleanup(void)
451 {
452 struct active_request_slot *slot = active_queue_head;
453
454 while (slot != NULL) {
455 struct active_request_slot *next = slot->next;
456 if (slot->curl != NULL) {
457 #ifdef USE_CURL_MULTI
458 curl_multi_remove_handle(curlm, slot->curl);
459 #endif
460 curl_easy_cleanup(slot->curl);
461 }
462 free(slot);
463 slot = next;
464 }
465 active_queue_head = NULL;
466
467 #ifndef NO_CURL_EASY_DUPHANDLE
468 curl_easy_cleanup(curl_default);
469 #endif
470
471 #ifdef USE_CURL_MULTI
472 curl_multi_cleanup(curlm);
473 #endif
474 curl_global_cleanup();
475
476 curl_slist_free_all(pragma_header);
477 pragma_header = NULL;
478
479 curl_slist_free_all(no_pragma_header);
480 no_pragma_header = NULL;
481
482 if (curl_http_proxy) {
483 free((void *)curl_http_proxy);
484 curl_http_proxy = NULL;
485 }
486
487 if (ssl_cert_password != NULL) {
488 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
489 free(ssl_cert_password);
490 ssl_cert_password = NULL;
491 }
492 ssl_cert_password_required = 0;
493 }
494
495 struct active_request_slot *get_active_slot(void)
496 {
497 struct active_request_slot *slot = active_queue_head;
498 struct active_request_slot *newslot;
499
500 #ifdef USE_CURL_MULTI
501 int num_transfers;
502
503 /* Wait for a slot to open up if the queue is full */
504 while (active_requests >= max_requests) {
505 curl_multi_perform(curlm, &num_transfers);
506 if (num_transfers < active_requests)
507 process_curl_messages();
508 }
509 #endif
510
511 while (slot != NULL && slot->in_use)
512 slot = slot->next;
513
514 if (slot == NULL) {
515 newslot = xmalloc(sizeof(*newslot));
516 newslot->curl = NULL;
517 newslot->in_use = 0;
518 newslot->next = NULL;
519
520 slot = active_queue_head;
521 if (slot == NULL) {
522 active_queue_head = newslot;
523 } else {
524 while (slot->next != NULL)
525 slot = slot->next;
526 slot->next = newslot;
527 }
528 slot = newslot;
529 }
530
531 if (slot->curl == NULL) {
532 #ifdef NO_CURL_EASY_DUPHANDLE
533 slot->curl = get_curl_handle();
534 #else
535 slot->curl = curl_easy_duphandle(curl_default);
536 #endif
537 curl_session_count++;
538 }
539
540 active_requests++;
541 slot->in_use = 1;
542 slot->results = NULL;
543 slot->finished = NULL;
544 slot->callback_data = NULL;
545 slot->callback_func = NULL;
546 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
547 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
548 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
549 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
550 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
551 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
552 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
553 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
554 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
555
556 return slot;
557 }
558
559 int start_active_slot(struct active_request_slot *slot)
560 {
561 #ifdef USE_CURL_MULTI
562 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
563 int num_transfers;
564
565 if (curlm_result != CURLM_OK &&
566 curlm_result != CURLM_CALL_MULTI_PERFORM) {
567 active_requests--;
568 slot->in_use = 0;
569 return 0;
570 }
571
572 /*
573 * We know there must be something to do, since we just added
574 * something.
575 */
576 curl_multi_perform(curlm, &num_transfers);
577 #endif
578 return 1;
579 }
580
581 #ifdef USE_CURL_MULTI
582 struct fill_chain {
583 void *data;
584 int (*fill)(void *);
585 struct fill_chain *next;
586 };
587
588 static struct fill_chain *fill_cfg;
589
590 void add_fill_function(void *data, int (*fill)(void *))
591 {
592 struct fill_chain *new = xmalloc(sizeof(*new));
593 struct fill_chain **linkp = &fill_cfg;
594 new->data = data;
595 new->fill = fill;
596 new->next = NULL;
597 while (*linkp)
598 linkp = &(*linkp)->next;
599 *linkp = new;
600 }
601
602 void fill_active_slots(void)
603 {
604 struct active_request_slot *slot = active_queue_head;
605
606 while (active_requests < max_requests) {
607 struct fill_chain *fill;
608 for (fill = fill_cfg; fill; fill = fill->next)
609 if (fill->fill(fill->data))
610 break;
611
612 if (!fill)
613 break;
614 }
615
616 while (slot != NULL) {
617 if (!slot->in_use && slot->curl != NULL
618 && curl_session_count > min_curl_sessions) {
619 curl_easy_cleanup(slot->curl);
620 slot->curl = NULL;
621 curl_session_count--;
622 }
623 slot = slot->next;
624 }
625 }
626
627 void step_active_slots(void)
628 {
629 int num_transfers;
630 CURLMcode curlm_result;
631
632 do {
633 curlm_result = curl_multi_perform(curlm, &num_transfers);
634 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
635 if (num_transfers < active_requests) {
636 process_curl_messages();
637 fill_active_slots();
638 }
639 }
640 #endif
641
642 void run_active_slot(struct active_request_slot *slot)
643 {
644 #ifdef USE_CURL_MULTI
645 fd_set readfds;
646 fd_set writefds;
647 fd_set excfds;
648 int max_fd;
649 struct timeval select_timeout;
650 int finished = 0;
651
652 slot->finished = &finished;
653 while (!finished) {
654 step_active_slots();
655
656 if (slot->in_use) {
657 #if LIBCURL_VERSION_NUM >= 0x070f04
658 long curl_timeout;
659 curl_multi_timeout(curlm, &curl_timeout);
660 if (curl_timeout == 0) {
661 continue;
662 } else if (curl_timeout == -1) {
663 select_timeout.tv_sec = 0;
664 select_timeout.tv_usec = 50000;
665 } else {
666 select_timeout.tv_sec = curl_timeout / 1000;
667 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
668 }
669 #else
670 select_timeout.tv_sec = 0;
671 select_timeout.tv_usec = 50000;
672 #endif
673
674 max_fd = -1;
675 FD_ZERO(&readfds);
676 FD_ZERO(&writefds);
677 FD_ZERO(&excfds);
678 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
679
680 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
681 }
682 }
683 #else
684 while (slot->in_use) {
685 slot->curl_result = curl_easy_perform(slot->curl);
686 finish_active_slot(slot);
687 }
688 #endif
689 }
690
691 static void closedown_active_slot(struct active_request_slot *slot)
692 {
693 active_requests--;
694 slot->in_use = 0;
695 }
696
697 static void release_active_slot(struct active_request_slot *slot)
698 {
699 closedown_active_slot(slot);
700 if (slot->curl && curl_session_count > min_curl_sessions) {
701 #ifdef USE_CURL_MULTI
702 curl_multi_remove_handle(curlm, slot->curl);
703 #endif
704 curl_easy_cleanup(slot->curl);
705 slot->curl = NULL;
706 curl_session_count--;
707 }
708 #ifdef USE_CURL_MULTI
709 fill_active_slots();
710 #endif
711 }
712
713 void finish_active_slot(struct active_request_slot *slot)
714 {
715 closedown_active_slot(slot);
716 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
717
718 if (slot->finished != NULL)
719 (*slot->finished) = 1;
720
721 /* Store slot results so they can be read after the slot is reused */
722 if (slot->results != NULL) {
723 slot->results->curl_result = slot->curl_result;
724 slot->results->http_code = slot->http_code;
725 }
726
727 /* Run callback if appropriate */
728 if (slot->callback_func != NULL)
729 slot->callback_func(slot->callback_data);
730 }
731
732 void finish_all_active_slots(void)
733 {
734 struct active_request_slot *slot = active_queue_head;
735
736 while (slot != NULL)
737 if (slot->in_use) {
738 run_active_slot(slot);
739 slot = active_queue_head;
740 } else {
741 slot = slot->next;
742 }
743 }
744
745 /* Helpers for modifying and creating URLs */
746 static inline int needs_quote(int ch)
747 {
748 if (((ch >= 'A') && (ch <= 'Z'))
749 || ((ch >= 'a') && (ch <= 'z'))
750 || ((ch >= '0') && (ch <= '9'))
751 || (ch == '/')
752 || (ch == '-')
753 || (ch == '.'))
754 return 0;
755 return 1;
756 }
757
758 static char *quote_ref_url(const char *base, const char *ref)
759 {
760 struct strbuf buf = STRBUF_INIT;
761 const char *cp;
762 int ch;
763
764 end_url_with_slash(&buf, base);
765
766 for (cp = ref; (ch = *cp) != 0; cp++)
767 if (needs_quote(ch))
768 strbuf_addf(&buf, "%%%02x", ch);
769 else
770 strbuf_addch(&buf, *cp);
771
772 return strbuf_detach(&buf, NULL);
773 }
774
775 void append_remote_object_url(struct strbuf *buf, const char *url,
776 const char *hex,
777 int only_two_digit_prefix)
778 {
779 end_url_with_slash(buf, url);
780
781 strbuf_addf(buf, "objects/%.*s/", 2, hex);
782 if (!only_two_digit_prefix)
783 strbuf_addf(buf, "%s", hex+2);
784 }
785
786 char *get_remote_object_url(const char *url, const char *hex,
787 int only_two_digit_prefix)
788 {
789 struct strbuf buf = STRBUF_INIT;
790 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
791 return strbuf_detach(&buf, NULL);
792 }
793
794 /* http_request() targets */
795 #define HTTP_REQUEST_STRBUF 0
796 #define HTTP_REQUEST_FILE 1
797
798 static int http_request(const char *url, void *result, int target, int options)
799 {
800 struct active_request_slot *slot;
801 struct slot_results results;
802 struct curl_slist *headers = NULL;
803 struct strbuf buf = STRBUF_INIT;
804 int ret;
805
806 slot = get_active_slot();
807 slot->results = &results;
808 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
809
810 if (result == NULL) {
811 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
812 } else {
813 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
814 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
815
816 if (target == HTTP_REQUEST_FILE) {
817 long posn = ftell(result);
818 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
819 fwrite);
820 if (posn > 0) {
821 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
822 headers = curl_slist_append(headers, buf.buf);
823 strbuf_reset(&buf);
824 }
825 } else
826 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
827 fwrite_buffer);
828 }
829
830 strbuf_addstr(&buf, "Pragma:");
831 if (options & HTTP_NO_CACHE)
832 strbuf_addstr(&buf, " no-cache");
833
834 headers = curl_slist_append(headers, buf.buf);
835
836 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
837 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
838
839 if (start_active_slot(slot)) {
840 run_active_slot(slot);
841 if (results.curl_result == CURLE_OK)
842 ret = HTTP_OK;
843 else if (missing_target(&results))
844 ret = HTTP_MISSING_TARGET;
845 else if (results.http_code == 401) {
846 if (user_name && user_pass) {
847 ret = HTTP_NOAUTH;
848 } else {
849 /*
850 * git_getpass is needed here because its very likely stdin/stdout are
851 * pipes to our parent process. So we instead need to use /dev/tty,
852 * but that is non-portable. Using git_getpass() can at least be stubbed
853 * on other platforms with a different implementation if/when necessary.
854 */
855 if (!user_name)
856 user_name = xstrdup(git_getpass_with_description("Username", description));
857 init_curl_http_auth(slot->curl);
858 ret = HTTP_REAUTH;
859 }
860 } else {
861 if (!curl_errorstr[0])
862 strlcpy(curl_errorstr,
863 curl_easy_strerror(results.curl_result),
864 sizeof(curl_errorstr));
865 ret = HTTP_ERROR;
866 }
867 } else {
868 error("Unable to start HTTP request for %s", url);
869 ret = HTTP_START_FAILED;
870 }
871
872 curl_slist_free_all(headers);
873 strbuf_release(&buf);
874
875 return ret;
876 }
877
878 static int http_request_reauth(const char *url, void *result, int target,
879 int options)
880 {
881 int ret = http_request(url, result, target, options);
882 if (ret != HTTP_REAUTH)
883 return ret;
884 return http_request(url, result, target, options);
885 }
886
887 int http_get_strbuf(const char *url, struct strbuf *result, int options)
888 {
889 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
890 }
891
892 /*
893 * Downloads an url and stores the result in the given file.
894 *
895 * If a previous interrupted download is detected (i.e. a previous temporary
896 * file is still around) the download is resumed.
897 */
898 static int http_get_file(const char *url, const char *filename, int options)
899 {
900 int ret;
901 struct strbuf tmpfile = STRBUF_INIT;
902 FILE *result;
903
904 strbuf_addf(&tmpfile, "%s.temp", filename);
905 result = fopen(tmpfile.buf, "a");
906 if (! result) {
907 error("Unable to open local file %s", tmpfile.buf);
908 ret = HTTP_ERROR;
909 goto cleanup;
910 }
911
912 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
913 fclose(result);
914
915 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
916 ret = HTTP_ERROR;
917 cleanup:
918 strbuf_release(&tmpfile);
919 return ret;
920 }
921
922 int http_error(const char *url, int ret)
923 {
924 /* http_request has already handled HTTP_START_FAILED. */
925 if (ret != HTTP_START_FAILED)
926 error("%s while accessing %s", curl_errorstr, url);
927
928 return ret;
929 }
930
931 int http_fetch_ref(const char *base, struct ref *ref)
932 {
933 char *url;
934 struct strbuf buffer = STRBUF_INIT;
935 int ret = -1;
936
937 url = quote_ref_url(base, ref->name);
938 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
939 strbuf_rtrim(&buffer);
940 if (buffer.len == 40)
941 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
942 else if (!prefixcmp(buffer.buf, "ref: ")) {
943 ref->symref = xstrdup(buffer.buf + 5);
944 ret = 0;
945 }
946 }
947
948 strbuf_release(&buffer);
949 free(url);
950 return ret;
951 }
952
953 /* Helpers for fetching packs */
954 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
955 {
956 char *url, *tmp;
957 struct strbuf buf = STRBUF_INIT;
958
959 if (http_is_verbose)
960 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
961
962 end_url_with_slash(&buf, base_url);
963 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
964 url = strbuf_detach(&buf, NULL);
965
966 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
967 tmp = strbuf_detach(&buf, NULL);
968
969 if (http_get_file(url, tmp, 0) != HTTP_OK) {
970 error("Unable to get pack index %s\n", url);
971 free(tmp);
972 tmp = NULL;
973 }
974
975 free(url);
976 return tmp;
977 }
978
979 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
980 unsigned char *sha1, const char *base_url)
981 {
982 struct packed_git *new_pack;
983 char *tmp_idx = NULL;
984 int ret;
985
986 if (has_pack_index(sha1)) {
987 new_pack = parse_pack_index(sha1, NULL);
988 if (!new_pack)
989 return -1; /* parse_pack_index() already issued error message */
990 goto add_pack;
991 }
992
993 tmp_idx = fetch_pack_index(sha1, base_url);
994 if (!tmp_idx)
995 return -1;
996
997 new_pack = parse_pack_index(sha1, tmp_idx);
998 if (!new_pack) {
999 unlink(tmp_idx);
1000 free(tmp_idx);
1001
1002 return -1; /* parse_pack_index() already issued error message */
1003 }
1004
1005 ret = verify_pack_index(new_pack);
1006 if (!ret) {
1007 close_pack_index(new_pack);
1008 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1009 }
1010 free(tmp_idx);
1011 if (ret)
1012 return -1;
1013
1014 add_pack:
1015 new_pack->next = *packs_head;
1016 *packs_head = new_pack;
1017 return 0;
1018 }
1019
1020 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1021 {
1022 int ret = 0, i = 0;
1023 char *url, *data;
1024 struct strbuf buf = STRBUF_INIT;
1025 unsigned char sha1[20];
1026
1027 end_url_with_slash(&buf, base_url);
1028 strbuf_addstr(&buf, "objects/info/packs");
1029 url = strbuf_detach(&buf, NULL);
1030
1031 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1032 if (ret != HTTP_OK)
1033 goto cleanup;
1034
1035 data = buf.buf;
1036 while (i < buf.len) {
1037 switch (data[i]) {
1038 case 'P':
1039 i++;
1040 if (i + 52 <= buf.len &&
1041 !prefixcmp(data + i, " pack-") &&
1042 !prefixcmp(data + i + 46, ".pack\n")) {
1043 get_sha1_hex(data + i + 6, sha1);
1044 fetch_and_setup_pack_index(packs_head, sha1,
1045 base_url);
1046 i += 51;
1047 break;
1048 }
1049 default:
1050 while (i < buf.len && data[i] != '\n')
1051 i++;
1052 }
1053 i++;
1054 }
1055
1056 cleanup:
1057 free(url);
1058 return ret;
1059 }
1060
1061 void release_http_pack_request(struct http_pack_request *preq)
1062 {
1063 if (preq->packfile != NULL) {
1064 fclose(preq->packfile);
1065 preq->packfile = NULL;
1066 }
1067 if (preq->range_header != NULL) {
1068 curl_slist_free_all(preq->range_header);
1069 preq->range_header = NULL;
1070 }
1071 preq->slot = NULL;
1072 free(preq->url);
1073 }
1074
1075 int finish_http_pack_request(struct http_pack_request *preq)
1076 {
1077 struct packed_git **lst;
1078 struct packed_git *p = preq->target;
1079 char *tmp_idx;
1080 struct child_process ip;
1081 const char *ip_argv[8];
1082
1083 close_pack_index(p);
1084
1085 fclose(preq->packfile);
1086 preq->packfile = NULL;
1087
1088 lst = preq->lst;
1089 while (*lst != p)
1090 lst = &((*lst)->next);
1091 *lst = (*lst)->next;
1092
1093 tmp_idx = xstrdup(preq->tmpfile);
1094 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1095 ".idx.temp");
1096
1097 ip_argv[0] = "index-pack";
1098 ip_argv[1] = "-o";
1099 ip_argv[2] = tmp_idx;
1100 ip_argv[3] = preq->tmpfile;
1101 ip_argv[4] = NULL;
1102
1103 memset(&ip, 0, sizeof(ip));
1104 ip.argv = ip_argv;
1105 ip.git_cmd = 1;
1106 ip.no_stdin = 1;
1107 ip.no_stdout = 1;
1108
1109 if (run_command(&ip)) {
1110 unlink(preq->tmpfile);
1111 unlink(tmp_idx);
1112 free(tmp_idx);
1113 return -1;
1114 }
1115
1116 unlink(sha1_pack_index_name(p->sha1));
1117
1118 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1119 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1120 free(tmp_idx);
1121 return -1;
1122 }
1123
1124 install_packed_git(p);
1125 free(tmp_idx);
1126 return 0;
1127 }
1128
1129 struct http_pack_request *new_http_pack_request(
1130 struct packed_git *target, const char *base_url)
1131 {
1132 long prev_posn = 0;
1133 char range[RANGE_HEADER_SIZE];
1134 struct strbuf buf = STRBUF_INIT;
1135 struct http_pack_request *preq;
1136
1137 preq = xcalloc(1, sizeof(*preq));
1138 preq->target = target;
1139
1140 end_url_with_slash(&buf, base_url);
1141 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1142 sha1_to_hex(target->sha1));
1143 preq->url = strbuf_detach(&buf, NULL);
1144
1145 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1146 sha1_pack_name(target->sha1));
1147 preq->packfile = fopen(preq->tmpfile, "a");
1148 if (!preq->packfile) {
1149 error("Unable to open local file %s for pack",
1150 preq->tmpfile);
1151 goto abort;
1152 }
1153
1154 preq->slot = get_active_slot();
1155 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1156 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1157 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1158 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1159 no_pragma_header);
1160
1161 /*
1162 * If there is data present from a previous transfer attempt,
1163 * resume where it left off
1164 */
1165 prev_posn = ftell(preq->packfile);
1166 if (prev_posn>0) {
1167 if (http_is_verbose)
1168 fprintf(stderr,
1169 "Resuming fetch of pack %s at byte %ld\n",
1170 sha1_to_hex(target->sha1), prev_posn);
1171 sprintf(range, "Range: bytes=%ld-", prev_posn);
1172 preq->range_header = curl_slist_append(NULL, range);
1173 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1174 preq->range_header);
1175 }
1176
1177 return preq;
1178
1179 abort:
1180 free(preq->url);
1181 free(preq);
1182 return NULL;
1183 }
1184
1185 /* Helpers for fetching objects (loose) */
1186 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1187 void *data)
1188 {
1189 unsigned char expn[4096];
1190 size_t size = eltsize * nmemb;
1191 int posn = 0;
1192 struct http_object_request *freq =
1193 (struct http_object_request *)data;
1194 do {
1195 ssize_t retval = xwrite(freq->localfile,
1196 (char *) ptr + posn, size - posn);
1197 if (retval < 0)
1198 return posn;
1199 posn += retval;
1200 } while (posn < size);
1201
1202 freq->stream.avail_in = size;
1203 freq->stream.next_in = (void *)ptr;
1204 do {
1205 freq->stream.next_out = expn;
1206 freq->stream.avail_out = sizeof(expn);
1207 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1208 git_SHA1_Update(&freq->c, expn,
1209 sizeof(expn) - freq->stream.avail_out);
1210 } while (freq->stream.avail_in && freq->zret == Z_OK);
1211 return size;
1212 }
1213
1214 struct http_object_request *new_http_object_request(const char *base_url,
1215 unsigned char *sha1)
1216 {
1217 char *hex = sha1_to_hex(sha1);
1218 char *filename;
1219 char prevfile[PATH_MAX];
1220 int prevlocal;
1221 char prev_buf[PREV_BUF_SIZE];
1222 ssize_t prev_read = 0;
1223 long prev_posn = 0;
1224 char range[RANGE_HEADER_SIZE];
1225 struct curl_slist *range_header = NULL;
1226 struct http_object_request *freq;
1227
1228 freq = xcalloc(1, sizeof(*freq));
1229 hashcpy(freq->sha1, sha1);
1230 freq->localfile = -1;
1231
1232 filename = sha1_file_name(sha1);
1233 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1234 "%s.temp", filename);
1235
1236 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1237 unlink_or_warn(prevfile);
1238 rename(freq->tmpfile, prevfile);
1239 unlink_or_warn(freq->tmpfile);
1240
1241 if (freq->localfile != -1)
1242 error("fd leakage in start: %d", freq->localfile);
1243 freq->localfile = open(freq->tmpfile,
1244 O_WRONLY | O_CREAT | O_EXCL, 0666);
1245 /*
1246 * This could have failed due to the "lazy directory creation";
1247 * try to mkdir the last path component.
1248 */
1249 if (freq->localfile < 0 && errno == ENOENT) {
1250 char *dir = strrchr(freq->tmpfile, '/');
1251 if (dir) {
1252 *dir = 0;
1253 mkdir(freq->tmpfile, 0777);
1254 *dir = '/';
1255 }
1256 freq->localfile = open(freq->tmpfile,
1257 O_WRONLY | O_CREAT | O_EXCL, 0666);
1258 }
1259
1260 if (freq->localfile < 0) {
1261 error("Couldn't create temporary file %s: %s",
1262 freq->tmpfile, strerror(errno));
1263 goto abort;
1264 }
1265
1266 git_inflate_init(&freq->stream);
1267
1268 git_SHA1_Init(&freq->c);
1269
1270 freq->url = get_remote_object_url(base_url, hex, 0);
1271
1272 /*
1273 * If a previous temp file is present, process what was already
1274 * fetched.
1275 */
1276 prevlocal = open(prevfile, O_RDONLY);
1277 if (prevlocal != -1) {
1278 do {
1279 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1280 if (prev_read>0) {
1281 if (fwrite_sha1_file(prev_buf,
1282 1,
1283 prev_read,
1284 freq) == prev_read) {
1285 prev_posn += prev_read;
1286 } else {
1287 prev_read = -1;
1288 }
1289 }
1290 } while (prev_read > 0);
1291 close(prevlocal);
1292 }
1293 unlink_or_warn(prevfile);
1294
1295 /*
1296 * Reset inflate/SHA1 if there was an error reading the previous temp
1297 * file; also rewind to the beginning of the local file.
1298 */
1299 if (prev_read == -1) {
1300 memset(&freq->stream, 0, sizeof(freq->stream));
1301 git_inflate_init(&freq->stream);
1302 git_SHA1_Init(&freq->c);
1303 if (prev_posn>0) {
1304 prev_posn = 0;
1305 lseek(freq->localfile, 0, SEEK_SET);
1306 if (ftruncate(freq->localfile, 0) < 0) {
1307 error("Couldn't truncate temporary file %s: %s",
1308 freq->tmpfile, strerror(errno));
1309 goto abort;
1310 }
1311 }
1312 }
1313
1314 freq->slot = get_active_slot();
1315
1316 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1317 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1318 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1319 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1320 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1321
1322 /*
1323 * If we have successfully processed data from a previous fetch
1324 * attempt, only fetch the data we don't already have.
1325 */
1326 if (prev_posn>0) {
1327 if (http_is_verbose)
1328 fprintf(stderr,
1329 "Resuming fetch of object %s at byte %ld\n",
1330 hex, prev_posn);
1331 sprintf(range, "Range: bytes=%ld-", prev_posn);
1332 range_header = curl_slist_append(range_header, range);
1333 curl_easy_setopt(freq->slot->curl,
1334 CURLOPT_HTTPHEADER, range_header);
1335 }
1336
1337 return freq;
1338
1339 abort:
1340 free(freq->url);
1341 free(freq);
1342 return NULL;
1343 }
1344
1345 void process_http_object_request(struct http_object_request *freq)
1346 {
1347 if (freq->slot == NULL)
1348 return;
1349 freq->curl_result = freq->slot->curl_result;
1350 freq->http_code = freq->slot->http_code;
1351 freq->slot = NULL;
1352 }
1353
1354 int finish_http_object_request(struct http_object_request *freq)
1355 {
1356 struct stat st;
1357
1358 close(freq->localfile);
1359 freq->localfile = -1;
1360
1361 process_http_object_request(freq);
1362
1363 if (freq->http_code == 416) {
1364 warning("requested range invalid; we may already have all the data.");
1365 } else if (freq->curl_result != CURLE_OK) {
1366 if (stat(freq->tmpfile, &st) == 0)
1367 if (st.st_size == 0)
1368 unlink_or_warn(freq->tmpfile);
1369 return -1;
1370 }
1371
1372 git_inflate_end(&freq->stream);
1373 git_SHA1_Final(freq->real_sha1, &freq->c);
1374 if (freq->zret != Z_STREAM_END) {
1375 unlink_or_warn(freq->tmpfile);
1376 return -1;
1377 }
1378 if (hashcmp(freq->sha1, freq->real_sha1)) {
1379 unlink_or_warn(freq->tmpfile);
1380 return -1;
1381 }
1382 freq->rename =
1383 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1384
1385 return freq->rename;
1386 }
1387
1388 void abort_http_object_request(struct http_object_request *freq)
1389 {
1390 unlink_or_warn(freq->tmpfile);
1391
1392 release_http_object_request(freq);
1393 }
1394
1395 void release_http_object_request(struct http_object_request *freq)
1396 {
1397 if (freq->localfile != -1) {
1398 close(freq->localfile);
1399 freq->localfile = -1;
1400 }
1401 if (freq->url != NULL) {
1402 free(freq->url);
1403 freq->url = NULL;
1404 }
1405 if (freq->slot != NULL) {
1406 freq->slot->callback_func = NULL;
1407 freq->slot->callback_data = NULL;
1408 release_active_slot(freq->slot);
1409 freq->slot = NULL;
1410 }
1411 }
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