c9393a84715aa543938b9c4f934186334486daae
1 #include "http.h"
2 #include "pack.h"
3 #include "sideband.h"
4 #include "run-command.h"
5 #include "url.h"
7 int data_received;
8 int active_requests;
9 int http_is_verbose;
10 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
12 #if LIBCURL_VERSION_NUM >= 0x070a06
13 #define LIBCURL_CAN_HANDLE_AUTH_ANY
14 #endif
16 static int min_curl_sessions = 1;
17 static int curl_session_count;
18 #ifdef USE_CURL_MULTI
19 static int max_requests = -1;
20 static CURLM *curlm;
21 #endif
22 #ifndef NO_CURL_EASY_DUPHANDLE
23 static CURL *curl_default;
24 #endif
26 #define PREV_BUF_SIZE 4096
27 #define RANGE_HEADER_SIZE 30
29 char curl_errorstr[CURL_ERROR_SIZE];
31 static int curl_ssl_verify = -1;
32 static const char *ssl_cert;
33 #if LIBCURL_VERSION_NUM >= 0x070903
34 static const char *ssl_key;
35 #endif
36 #if LIBCURL_VERSION_NUM >= 0x070908
37 static const char *ssl_capath;
38 #endif
39 static const char *ssl_cainfo;
40 static long curl_low_speed_limit = -1;
41 static long curl_low_speed_time = -1;
42 static int curl_ftp_no_epsv;
43 static const char *curl_http_proxy;
44 static char *user_name, *user_pass;
45 static const char *user_agent;
47 #if LIBCURL_VERSION_NUM >= 0x071700
48 /* Use CURLOPT_KEYPASSWD as is */
49 #elif LIBCURL_VERSION_NUM >= 0x070903
50 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
51 #else
52 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
53 #endif
55 static char *ssl_cert_password;
56 static int ssl_cert_password_required;
58 static struct curl_slist *pragma_header;
59 static struct curl_slist *no_pragma_header;
61 static struct active_request_slot *active_queue_head;
63 size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
64 {
65 size_t size = eltsize * nmemb;
66 struct buffer *buffer = buffer_;
68 if (size > buffer->buf.len - buffer->posn)
69 size = buffer->buf.len - buffer->posn;
70 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
71 buffer->posn += size;
73 return size;
74 }
76 #ifndef NO_CURL_IOCTL
77 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
78 {
79 struct buffer *buffer = clientp;
81 switch (cmd) {
82 case CURLIOCMD_NOP:
83 return CURLIOE_OK;
85 case CURLIOCMD_RESTARTREAD:
86 buffer->posn = 0;
87 return CURLIOE_OK;
89 default:
90 return CURLIOE_UNKNOWNCMD;
91 }
92 }
93 #endif
95 size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
96 {
97 size_t size = eltsize * nmemb;
98 struct strbuf *buffer = buffer_;
100 strbuf_add(buffer, ptr, size);
101 data_received++;
102 return size;
103 }
105 size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
106 {
107 data_received++;
108 return eltsize * nmemb;
109 }
111 #ifdef USE_CURL_MULTI
112 static void process_curl_messages(void)
113 {
114 int num_messages;
115 struct active_request_slot *slot;
116 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
118 while (curl_message != NULL) {
119 if (curl_message->msg == CURLMSG_DONE) {
120 int curl_result = curl_message->data.result;
121 slot = active_queue_head;
122 while (slot != NULL &&
123 slot->curl != curl_message->easy_handle)
124 slot = slot->next;
125 if (slot != NULL) {
126 curl_multi_remove_handle(curlm, slot->curl);
127 slot->curl_result = curl_result;
128 finish_active_slot(slot);
129 } else {
130 fprintf(stderr, "Received DONE message for unknown request!\n");
131 }
132 } else {
133 fprintf(stderr, "Unknown CURL message received: %d\n",
134 (int)curl_message->msg);
135 }
136 curl_message = curl_multi_info_read(curlm, &num_messages);
137 }
138 }
139 #endif
141 static int http_options(const char *var, const char *value, void *cb)
142 {
143 if (!strcmp("http.sslverify", var)) {
144 curl_ssl_verify = git_config_bool(var, value);
145 return 0;
146 }
147 if (!strcmp("http.sslcert", var))
148 return git_config_string(&ssl_cert, var, value);
149 #if LIBCURL_VERSION_NUM >= 0x070903
150 if (!strcmp("http.sslkey", var))
151 return git_config_string(&ssl_key, var, value);
152 #endif
153 #if LIBCURL_VERSION_NUM >= 0x070908
154 if (!strcmp("http.sslcapath", var))
155 return git_config_string(&ssl_capath, var, value);
156 #endif
157 if (!strcmp("http.sslcainfo", var))
158 return git_config_string(&ssl_cainfo, var, value);
159 if (!strcmp("http.sslcertpasswordprotected", var)) {
160 if (git_config_bool(var, value))
161 ssl_cert_password_required = 1;
162 return 0;
163 }
164 if (!strcmp("http.minsessions", var)) {
165 min_curl_sessions = git_config_int(var, value);
166 #ifndef USE_CURL_MULTI
167 if (min_curl_sessions > 1)
168 min_curl_sessions = 1;
169 #endif
170 return 0;
171 }
172 #ifdef USE_CURL_MULTI
173 if (!strcmp("http.maxrequests", var)) {
174 max_requests = git_config_int(var, value);
175 return 0;
176 }
177 #endif
178 if (!strcmp("http.lowspeedlimit", var)) {
179 curl_low_speed_limit = (long)git_config_int(var, value);
180 return 0;
181 }
182 if (!strcmp("http.lowspeedtime", var)) {
183 curl_low_speed_time = (long)git_config_int(var, value);
184 return 0;
185 }
187 if (!strcmp("http.noepsv", var)) {
188 curl_ftp_no_epsv = git_config_bool(var, value);
189 return 0;
190 }
191 if (!strcmp("http.proxy", var))
192 return git_config_string(&curl_http_proxy, var, value);
194 if (!strcmp("http.postbuffer", var)) {
195 http_post_buffer = git_config_int(var, value);
196 if (http_post_buffer < LARGE_PACKET_MAX)
197 http_post_buffer = LARGE_PACKET_MAX;
198 return 0;
199 }
201 if (!strcmp("http.useragent", var))
202 return git_config_string(&user_agent, var, value);
204 /* Fall back on the default ones */
205 return git_default_config(var, value, cb);
206 }
208 static void init_curl_http_auth(CURL *result)
209 {
210 if (user_name) {
211 struct strbuf up = STRBUF_INIT;
212 if (!user_pass)
213 user_pass = xstrdup(git_getpass("Password: "));
214 strbuf_addf(&up, "%s:%s", user_name, user_pass);
215 curl_easy_setopt(result, CURLOPT_USERPWD,
216 strbuf_detach(&up, NULL));
217 }
218 }
220 static int has_cert_password(void)
221 {
222 if (ssl_cert_password != NULL)
223 return 1;
224 if (ssl_cert == NULL || ssl_cert_password_required != 1)
225 return 0;
226 /* Only prompt the user once. */
227 ssl_cert_password_required = -1;
228 ssl_cert_password = git_getpass("Certificate Password: ");
229 if (ssl_cert_password != NULL) {
230 ssl_cert_password = xstrdup(ssl_cert_password);
231 return 1;
232 } else
233 return 0;
234 }
236 static CURL *get_curl_handle(void)
237 {
238 CURL *result = curl_easy_init();
240 if (!curl_ssl_verify) {
241 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
242 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
243 } else {
244 /* Verify authenticity of the peer's certificate */
245 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
246 /* The name in the cert must match whom we tried to connect */
247 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
248 }
250 #if LIBCURL_VERSION_NUM >= 0x070907
251 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
252 #endif
253 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
254 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
255 #endif
257 init_curl_http_auth(result);
259 if (ssl_cert != NULL)
260 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
261 if (has_cert_password())
262 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
263 #if LIBCURL_VERSION_NUM >= 0x070903
264 if (ssl_key != NULL)
265 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
266 #endif
267 #if LIBCURL_VERSION_NUM >= 0x070908
268 if (ssl_capath != NULL)
269 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
270 #endif
271 if (ssl_cainfo != NULL)
272 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
273 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
275 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
276 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
277 curl_low_speed_limit);
278 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
279 curl_low_speed_time);
280 }
282 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
284 if (getenv("GIT_CURL_VERBOSE"))
285 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
287 curl_easy_setopt(result, CURLOPT_USERAGENT,
288 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
290 if (curl_ftp_no_epsv)
291 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
293 if (curl_http_proxy)
294 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
296 return result;
297 }
299 static void http_auth_init(const char *url)
300 {
301 char *at, *colon, *cp, *slash, *decoded;
302 int len;
304 cp = strstr(url, "://");
305 if (!cp)
306 return;
308 /*
309 * Ok, the URL looks like "proto://something". Which one?
310 * "proto://<user>:<pass>@<host>/...",
311 * "proto://<user>@<host>/...", or just
312 * "proto://<host>/..."?
313 */
314 cp += 3;
315 at = strchr(cp, '@');
316 colon = strchr(cp, ':');
317 slash = strchrnul(cp, '/');
318 if (!at || slash <= at)
319 return; /* No credentials */
320 if (!colon || at <= colon) {
321 /* Only username */
322 len = at - cp;
323 user_name = xmalloc(len + 1);
324 memcpy(user_name, cp, len);
325 user_name[len] = '\0';
326 decoded = url_decode(user_name);
327 free(user_name);
328 user_name = decoded;
329 user_pass = NULL;
330 } else {
331 len = colon - cp;
332 user_name = xmalloc(len + 1);
333 memcpy(user_name, cp, len);
334 user_name[len] = '\0';
335 decoded = url_decode(user_name);
336 free(user_name);
337 user_name = decoded;
338 len = at - (colon + 1);
339 user_pass = xmalloc(len + 1);
340 memcpy(user_pass, colon + 1, len);
341 user_pass[len] = '\0';
342 decoded = url_decode(user_pass);
343 free(user_pass);
344 user_pass = decoded;
345 }
346 }
348 static void set_from_env(const char **var, const char *envname)
349 {
350 const char *val = getenv(envname);
351 if (val)
352 *var = val;
353 }
355 void http_init(struct remote *remote)
356 {
357 char *low_speed_limit;
358 char *low_speed_time;
360 http_is_verbose = 0;
362 git_config(http_options, NULL);
364 curl_global_init(CURL_GLOBAL_ALL);
366 if (remote && remote->http_proxy)
367 curl_http_proxy = xstrdup(remote->http_proxy);
369 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
370 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
372 #ifdef USE_CURL_MULTI
373 {
374 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
375 if (http_max_requests != NULL)
376 max_requests = atoi(http_max_requests);
377 }
379 curlm = curl_multi_init();
380 if (curlm == NULL) {
381 fprintf(stderr, "Error creating curl multi handle.\n");
382 exit(1);
383 }
384 #endif
386 if (getenv("GIT_SSL_NO_VERIFY"))
387 curl_ssl_verify = 0;
389 set_from_env(&ssl_cert, "GIT_SSL_CERT");
390 #if LIBCURL_VERSION_NUM >= 0x070903
391 set_from_env(&ssl_key, "GIT_SSL_KEY");
392 #endif
393 #if LIBCURL_VERSION_NUM >= 0x070908
394 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
395 #endif
396 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
398 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
400 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
401 if (low_speed_limit != NULL)
402 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
403 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
404 if (low_speed_time != NULL)
405 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
407 if (curl_ssl_verify == -1)
408 curl_ssl_verify = 1;
410 curl_session_count = 0;
411 #ifdef USE_CURL_MULTI
412 if (max_requests < 1)
413 max_requests = DEFAULT_MAX_REQUESTS;
414 #endif
416 if (getenv("GIT_CURL_FTP_NO_EPSV"))
417 curl_ftp_no_epsv = 1;
419 if (remote && remote->url && remote->url[0]) {
420 http_auth_init(remote->url[0]);
421 if (!ssl_cert_password_required &&
422 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
423 !prefixcmp(remote->url[0], "https://"))
424 ssl_cert_password_required = 1;
425 }
427 #ifndef NO_CURL_EASY_DUPHANDLE
428 curl_default = get_curl_handle();
429 #endif
430 }
432 void http_cleanup(void)
433 {
434 struct active_request_slot *slot = active_queue_head;
436 while (slot != NULL) {
437 struct active_request_slot *next = slot->next;
438 if (slot->curl != NULL) {
439 #ifdef USE_CURL_MULTI
440 curl_multi_remove_handle(curlm, slot->curl);
441 #endif
442 curl_easy_cleanup(slot->curl);
443 }
444 free(slot);
445 slot = next;
446 }
447 active_queue_head = NULL;
449 #ifndef NO_CURL_EASY_DUPHANDLE
450 curl_easy_cleanup(curl_default);
451 #endif
453 #ifdef USE_CURL_MULTI
454 curl_multi_cleanup(curlm);
455 #endif
456 curl_global_cleanup();
458 curl_slist_free_all(pragma_header);
459 pragma_header = NULL;
461 curl_slist_free_all(no_pragma_header);
462 no_pragma_header = NULL;
464 if (curl_http_proxy) {
465 free((void *)curl_http_proxy);
466 curl_http_proxy = NULL;
467 }
469 if (ssl_cert_password != NULL) {
470 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
471 free(ssl_cert_password);
472 ssl_cert_password = NULL;
473 }
474 ssl_cert_password_required = 0;
475 }
477 struct active_request_slot *get_active_slot(void)
478 {
479 struct active_request_slot *slot = active_queue_head;
480 struct active_request_slot *newslot;
482 #ifdef USE_CURL_MULTI
483 int num_transfers;
485 /* Wait for a slot to open up if the queue is full */
486 while (active_requests >= max_requests) {
487 curl_multi_perform(curlm, &num_transfers);
488 if (num_transfers < active_requests)
489 process_curl_messages();
490 }
491 #endif
493 while (slot != NULL && slot->in_use)
494 slot = slot->next;
496 if (slot == NULL) {
497 newslot = xmalloc(sizeof(*newslot));
498 newslot->curl = NULL;
499 newslot->in_use = 0;
500 newslot->next = NULL;
502 slot = active_queue_head;
503 if (slot == NULL) {
504 active_queue_head = newslot;
505 } else {
506 while (slot->next != NULL)
507 slot = slot->next;
508 slot->next = newslot;
509 }
510 slot = newslot;
511 }
513 if (slot->curl == NULL) {
514 #ifdef NO_CURL_EASY_DUPHANDLE
515 slot->curl = get_curl_handle();
516 #else
517 slot->curl = curl_easy_duphandle(curl_default);
518 #endif
519 curl_session_count++;
520 }
522 active_requests++;
523 slot->in_use = 1;
524 slot->local = NULL;
525 slot->results = NULL;
526 slot->finished = NULL;
527 slot->callback_data = NULL;
528 slot->callback_func = NULL;
529 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
530 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
531 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
532 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
533 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
534 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
535 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
537 return slot;
538 }
540 int start_active_slot(struct active_request_slot *slot)
541 {
542 #ifdef USE_CURL_MULTI
543 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
544 int num_transfers;
546 if (curlm_result != CURLM_OK &&
547 curlm_result != CURLM_CALL_MULTI_PERFORM) {
548 active_requests--;
549 slot->in_use = 0;
550 return 0;
551 }
553 /*
554 * We know there must be something to do, since we just added
555 * something.
556 */
557 curl_multi_perform(curlm, &num_transfers);
558 #endif
559 return 1;
560 }
562 #ifdef USE_CURL_MULTI
563 struct fill_chain {
564 void *data;
565 int (*fill)(void *);
566 struct fill_chain *next;
567 };
569 static struct fill_chain *fill_cfg;
571 void add_fill_function(void *data, int (*fill)(void *))
572 {
573 struct fill_chain *new = xmalloc(sizeof(*new));
574 struct fill_chain **linkp = &fill_cfg;
575 new->data = data;
576 new->fill = fill;
577 new->next = NULL;
578 while (*linkp)
579 linkp = &(*linkp)->next;
580 *linkp = new;
581 }
583 void fill_active_slots(void)
584 {
585 struct active_request_slot *slot = active_queue_head;
587 while (active_requests < max_requests) {
588 struct fill_chain *fill;
589 for (fill = fill_cfg; fill; fill = fill->next)
590 if (fill->fill(fill->data))
591 break;
593 if (!fill)
594 break;
595 }
597 while (slot != NULL) {
598 if (!slot->in_use && slot->curl != NULL
599 && curl_session_count > min_curl_sessions) {
600 curl_easy_cleanup(slot->curl);
601 slot->curl = NULL;
602 curl_session_count--;
603 }
604 slot = slot->next;
605 }
606 }
608 void step_active_slots(void)
609 {
610 int num_transfers;
611 CURLMcode curlm_result;
613 do {
614 curlm_result = curl_multi_perform(curlm, &num_transfers);
615 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
616 if (num_transfers < active_requests) {
617 process_curl_messages();
618 fill_active_slots();
619 }
620 }
621 #endif
623 void run_active_slot(struct active_request_slot *slot)
624 {
625 #ifdef USE_CURL_MULTI
626 long last_pos = 0;
627 long current_pos;
628 fd_set readfds;
629 fd_set writefds;
630 fd_set excfds;
631 int max_fd;
632 struct timeval select_timeout;
633 int finished = 0;
635 slot->finished = &finished;
636 while (!finished) {
637 data_received = 0;
638 step_active_slots();
640 if (!data_received && slot->local != NULL) {
641 current_pos = ftell(slot->local);
642 if (current_pos > last_pos)
643 data_received++;
644 last_pos = current_pos;
645 }
647 if (slot->in_use && !data_received) {
648 max_fd = 0;
649 FD_ZERO(&readfds);
650 FD_ZERO(&writefds);
651 FD_ZERO(&excfds);
652 select_timeout.tv_sec = 0;
653 select_timeout.tv_usec = 50000;
654 select(max_fd, &readfds, &writefds,
655 &excfds, &select_timeout);
656 }
657 }
658 #else
659 while (slot->in_use) {
660 slot->curl_result = curl_easy_perform(slot->curl);
661 finish_active_slot(slot);
662 }
663 #endif
664 }
666 static void closedown_active_slot(struct active_request_slot *slot)
667 {
668 active_requests--;
669 slot->in_use = 0;
670 }
672 static void release_active_slot(struct active_request_slot *slot)
673 {
674 closedown_active_slot(slot);
675 if (slot->curl && curl_session_count > min_curl_sessions) {
676 #ifdef USE_CURL_MULTI
677 curl_multi_remove_handle(curlm, slot->curl);
678 #endif
679 curl_easy_cleanup(slot->curl);
680 slot->curl = NULL;
681 curl_session_count--;
682 }
683 #ifdef USE_CURL_MULTI
684 fill_active_slots();
685 #endif
686 }
688 void finish_active_slot(struct active_request_slot *slot)
689 {
690 closedown_active_slot(slot);
691 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
693 if (slot->finished != NULL)
694 (*slot->finished) = 1;
696 /* Store slot results so they can be read after the slot is reused */
697 if (slot->results != NULL) {
698 slot->results->curl_result = slot->curl_result;
699 slot->results->http_code = slot->http_code;
700 }
702 /* Run callback if appropriate */
703 if (slot->callback_func != NULL)
704 slot->callback_func(slot->callback_data);
705 }
707 void finish_all_active_slots(void)
708 {
709 struct active_request_slot *slot = active_queue_head;
711 while (slot != NULL)
712 if (slot->in_use) {
713 run_active_slot(slot);
714 slot = active_queue_head;
715 } else {
716 slot = slot->next;
717 }
718 }
720 /* Helpers for modifying and creating URLs */
721 static inline int needs_quote(int ch)
722 {
723 if (((ch >= 'A') && (ch <= 'Z'))
724 || ((ch >= 'a') && (ch <= 'z'))
725 || ((ch >= '0') && (ch <= '9'))
726 || (ch == '/')
727 || (ch == '-')
728 || (ch == '.'))
729 return 0;
730 return 1;
731 }
733 static inline int hex(int v)
734 {
735 if (v < 10)
736 return '0' + v;
737 else
738 return 'A' + v - 10;
739 }
741 void end_url_with_slash(struct strbuf *buf, const char *url)
742 {
743 strbuf_addstr(buf, url);
744 if (buf->len && buf->buf[buf->len - 1] != '/')
745 strbuf_addstr(buf, "/");
746 }
748 static char *quote_ref_url(const char *base, const char *ref)
749 {
750 struct strbuf buf = STRBUF_INIT;
751 const char *cp;
752 int ch;
754 end_url_with_slash(&buf, base);
756 for (cp = ref; (ch = *cp) != 0; cp++)
757 if (needs_quote(ch))
758 strbuf_addf(&buf, "%%%02x", ch);
759 else
760 strbuf_addch(&buf, *cp);
762 return strbuf_detach(&buf, NULL);
763 }
765 void append_remote_object_url(struct strbuf *buf, const char *url,
766 const char *hex,
767 int only_two_digit_prefix)
768 {
769 end_url_with_slash(buf, url);
771 strbuf_addf(buf, "objects/%.*s/", 2, hex);
772 if (!only_two_digit_prefix)
773 strbuf_addf(buf, "%s", hex+2);
774 }
776 char *get_remote_object_url(const char *url, const char *hex,
777 int only_two_digit_prefix)
778 {
779 struct strbuf buf = STRBUF_INIT;
780 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
781 return strbuf_detach(&buf, NULL);
782 }
784 /* http_request() targets */
785 #define HTTP_REQUEST_STRBUF 0
786 #define HTTP_REQUEST_FILE 1
788 static int http_request(const char *url, void *result, int target, int options)
789 {
790 struct active_request_slot *slot;
791 struct slot_results results;
792 struct curl_slist *headers = NULL;
793 struct strbuf buf = STRBUF_INIT;
794 int ret;
796 slot = get_active_slot();
797 slot->results = &results;
798 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
800 if (result == NULL) {
801 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
802 } else {
803 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
804 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
806 if (target == HTTP_REQUEST_FILE) {
807 long posn = ftell(result);
808 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
809 fwrite);
810 if (posn > 0) {
811 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
812 headers = curl_slist_append(headers, buf.buf);
813 strbuf_reset(&buf);
814 }
815 slot->local = result;
816 } else
817 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
818 fwrite_buffer);
819 }
821 strbuf_addstr(&buf, "Pragma:");
822 if (options & HTTP_NO_CACHE)
823 strbuf_addstr(&buf, " no-cache");
825 headers = curl_slist_append(headers, buf.buf);
827 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
828 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
830 if (start_active_slot(slot)) {
831 run_active_slot(slot);
832 if (results.curl_result == CURLE_OK)
833 ret = HTTP_OK;
834 else if (missing_target(&results))
835 ret = HTTP_MISSING_TARGET;
836 else if (results.http_code == 401) {
837 if (user_name) {
838 ret = HTTP_NOAUTH;
839 } else {
840 /*
841 * git_getpass is needed here because its very likely stdin/stdout are
842 * pipes to our parent process. So we instead need to use /dev/tty,
843 * but that is non-portable. Using git_getpass() can at least be stubbed
844 * on other platforms with a different implementation if/when necessary.
845 */
846 user_name = xstrdup(git_getpass("Username: "));
847 init_curl_http_auth(slot->curl);
848 ret = HTTP_REAUTH;
849 }
850 } else
851 ret = HTTP_ERROR;
852 } else {
853 error("Unable to start HTTP request for %s", url);
854 ret = HTTP_START_FAILED;
855 }
857 slot->local = NULL;
858 curl_slist_free_all(headers);
859 strbuf_release(&buf);
861 return ret;
862 }
864 int http_get_strbuf(const char *url, struct strbuf *result, int options)
865 {
866 int http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
867 if (http_ret == HTTP_REAUTH) {
868 http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
869 }
870 return http_ret;
871 }
873 /*
874 * Downloads an url and stores the result in the given file.
875 *
876 * If a previous interrupted download is detected (i.e. a previous temporary
877 * file is still around) the download is resumed.
878 */
879 static int http_get_file(const char *url, const char *filename, int options)
880 {
881 int ret;
882 struct strbuf tmpfile = STRBUF_INIT;
883 FILE *result;
885 strbuf_addf(&tmpfile, "%s.temp", filename);
886 result = fopen(tmpfile.buf, "a");
887 if (! result) {
888 error("Unable to open local file %s", tmpfile.buf);
889 ret = HTTP_ERROR;
890 goto cleanup;
891 }
893 ret = http_request(url, result, HTTP_REQUEST_FILE, options);
894 fclose(result);
896 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
897 ret = HTTP_ERROR;
898 cleanup:
899 strbuf_release(&tmpfile);
900 return ret;
901 }
903 int http_error(const char *url, int ret)
904 {
905 /* http_request has already handled HTTP_START_FAILED. */
906 if (ret != HTTP_START_FAILED)
907 error("%s while accessing %s\n", curl_errorstr, url);
909 return ret;
910 }
912 int http_fetch_ref(const char *base, struct ref *ref)
913 {
914 char *url;
915 struct strbuf buffer = STRBUF_INIT;
916 int ret = -1;
918 url = quote_ref_url(base, ref->name);
919 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
920 strbuf_rtrim(&buffer);
921 if (buffer.len == 40)
922 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
923 else if (!prefixcmp(buffer.buf, "ref: ")) {
924 ref->symref = xstrdup(buffer.buf + 5);
925 ret = 0;
926 }
927 }
929 strbuf_release(&buffer);
930 free(url);
931 return ret;
932 }
934 /* Helpers for fetching packs */
935 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
936 {
937 char *url, *tmp;
938 struct strbuf buf = STRBUF_INIT;
940 if (http_is_verbose)
941 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
943 end_url_with_slash(&buf, base_url);
944 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
945 url = strbuf_detach(&buf, NULL);
947 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
948 tmp = strbuf_detach(&buf, NULL);
950 if (http_get_file(url, tmp, 0) != HTTP_OK) {
951 error("Unable to get pack index %s\n", url);
952 free(tmp);
953 tmp = NULL;
954 }
956 free(url);
957 return tmp;
958 }
960 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
961 unsigned char *sha1, const char *base_url)
962 {
963 struct packed_git *new_pack;
964 char *tmp_idx = NULL;
965 int ret;
967 if (has_pack_index(sha1)) {
968 new_pack = parse_pack_index(sha1, NULL);
969 if (!new_pack)
970 return -1; /* parse_pack_index() already issued error message */
971 goto add_pack;
972 }
974 tmp_idx = fetch_pack_index(sha1, base_url);
975 if (!tmp_idx)
976 return -1;
978 new_pack = parse_pack_index(sha1, tmp_idx);
979 if (!new_pack) {
980 unlink(tmp_idx);
981 free(tmp_idx);
983 return -1; /* parse_pack_index() already issued error message */
984 }
986 ret = verify_pack_index(new_pack);
987 if (!ret) {
988 close_pack_index(new_pack);
989 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
990 }
991 free(tmp_idx);
992 if (ret)
993 return -1;
995 add_pack:
996 new_pack->next = *packs_head;
997 *packs_head = new_pack;
998 return 0;
999 }
1001 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1002 {
1003 int ret = 0, i = 0;
1004 char *url, *data;
1005 struct strbuf buf = STRBUF_INIT;
1006 unsigned char sha1[20];
1008 end_url_with_slash(&buf, base_url);
1009 strbuf_addstr(&buf, "objects/info/packs");
1010 url = strbuf_detach(&buf, NULL);
1012 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1013 if (ret != HTTP_OK)
1014 goto cleanup;
1016 data = buf.buf;
1017 while (i < buf.len) {
1018 switch (data[i]) {
1019 case 'P':
1020 i++;
1021 if (i + 52 <= buf.len &&
1022 !prefixcmp(data + i, " pack-") &&
1023 !prefixcmp(data + i + 46, ".pack\n")) {
1024 get_sha1_hex(data + i + 6, sha1);
1025 fetch_and_setup_pack_index(packs_head, sha1,
1026 base_url);
1027 i += 51;
1028 break;
1029 }
1030 default:
1031 while (i < buf.len && data[i] != '\n')
1032 i++;
1033 }
1034 i++;
1035 }
1037 cleanup:
1038 free(url);
1039 return ret;
1040 }
1042 void release_http_pack_request(struct http_pack_request *preq)
1043 {
1044 if (preq->packfile != NULL) {
1045 fclose(preq->packfile);
1046 preq->packfile = NULL;
1047 preq->slot->local = NULL;
1048 }
1049 if (preq->range_header != NULL) {
1050 curl_slist_free_all(preq->range_header);
1051 preq->range_header = NULL;
1052 }
1053 preq->slot = NULL;
1054 free(preq->url);
1055 }
1057 int finish_http_pack_request(struct http_pack_request *preq)
1058 {
1059 struct packed_git **lst;
1060 struct packed_git *p = preq->target;
1061 char *tmp_idx;
1062 struct child_process ip;
1063 const char *ip_argv[8];
1065 close_pack_index(p);
1067 fclose(preq->packfile);
1068 preq->packfile = NULL;
1069 preq->slot->local = NULL;
1071 lst = preq->lst;
1072 while (*lst != p)
1073 lst = &((*lst)->next);
1074 *lst = (*lst)->next;
1076 tmp_idx = xstrdup(preq->tmpfile);
1077 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1078 ".idx.temp");
1080 ip_argv[0] = "index-pack";
1081 ip_argv[1] = "-o";
1082 ip_argv[2] = tmp_idx;
1083 ip_argv[3] = preq->tmpfile;
1084 ip_argv[4] = NULL;
1086 memset(&ip, 0, sizeof(ip));
1087 ip.argv = ip_argv;
1088 ip.git_cmd = 1;
1089 ip.no_stdin = 1;
1090 ip.no_stdout = 1;
1092 if (run_command(&ip)) {
1093 unlink(preq->tmpfile);
1094 unlink(tmp_idx);
1095 free(tmp_idx);
1096 return -1;
1097 }
1099 unlink(sha1_pack_index_name(p->sha1));
1101 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1102 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1103 free(tmp_idx);
1104 return -1;
1105 }
1107 install_packed_git(p);
1108 free(tmp_idx);
1109 return 0;
1110 }
1112 struct http_pack_request *new_http_pack_request(
1113 struct packed_git *target, const char *base_url)
1114 {
1115 long prev_posn = 0;
1116 char range[RANGE_HEADER_SIZE];
1117 struct strbuf buf = STRBUF_INIT;
1118 struct http_pack_request *preq;
1120 preq = xmalloc(sizeof(*preq));
1121 preq->target = target;
1122 preq->range_header = NULL;
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);
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 }
1138 preq->slot = get_active_slot();
1139 preq->slot->local = preq->packfile;
1140 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1141 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1142 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1143 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1144 no_pragma_header);
1146 /*
1147 * If there is data present from a previous transfer attempt,
1148 * resume where it left off
1149 */
1150 prev_posn = ftell(preq->packfile);
1151 if (prev_posn>0) {
1152 if (http_is_verbose)
1153 fprintf(stderr,
1154 "Resuming fetch of pack %s at byte %ld\n",
1155 sha1_to_hex(target->sha1), prev_posn);
1156 sprintf(range, "Range: bytes=%ld-", prev_posn);
1157 preq->range_header = curl_slist_append(NULL, range);
1158 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1159 preq->range_header);
1160 }
1162 return preq;
1164 abort:
1165 free(preq->url);
1166 free(preq);
1167 return NULL;
1168 }
1170 /* Helpers for fetching objects (loose) */
1171 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
1172 void *data)
1173 {
1174 unsigned char expn[4096];
1175 size_t size = eltsize * nmemb;
1176 int posn = 0;
1177 struct http_object_request *freq =
1178 (struct http_object_request *)data;
1179 do {
1180 ssize_t retval = xwrite(freq->localfile,
1181 (char *) ptr + posn, size - posn);
1182 if (retval < 0)
1183 return posn;
1184 posn += retval;
1185 } while (posn < size);
1187 freq->stream.avail_in = size;
1188 freq->stream.next_in = ptr;
1189 do {
1190 freq->stream.next_out = expn;
1191 freq->stream.avail_out = sizeof(expn);
1192 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1193 git_SHA1_Update(&freq->c, expn,
1194 sizeof(expn) - freq->stream.avail_out);
1195 } while (freq->stream.avail_in && freq->zret == Z_OK);
1196 data_received++;
1197 return size;
1198 }
1200 struct http_object_request *new_http_object_request(const char *base_url,
1201 unsigned char *sha1)
1202 {
1203 char *hex = sha1_to_hex(sha1);
1204 char *filename;
1205 char prevfile[PATH_MAX];
1206 int prevlocal;
1207 unsigned char prev_buf[PREV_BUF_SIZE];
1208 ssize_t prev_read = 0;
1209 long prev_posn = 0;
1210 char range[RANGE_HEADER_SIZE];
1211 struct curl_slist *range_header = NULL;
1212 struct http_object_request *freq;
1214 freq = xmalloc(sizeof(*freq));
1215 hashcpy(freq->sha1, sha1);
1216 freq->localfile = -1;
1218 filename = sha1_file_name(sha1);
1219 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1220 "%s.temp", filename);
1222 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1223 unlink_or_warn(prevfile);
1224 rename(freq->tmpfile, prevfile);
1225 unlink_or_warn(freq->tmpfile);
1227 if (freq->localfile != -1)
1228 error("fd leakage in start: %d", freq->localfile);
1229 freq->localfile = open(freq->tmpfile,
1230 O_WRONLY | O_CREAT | O_EXCL, 0666);
1231 /*
1232 * This could have failed due to the "lazy directory creation";
1233 * try to mkdir the last path component.
1234 */
1235 if (freq->localfile < 0 && errno == ENOENT) {
1236 char *dir = strrchr(freq->tmpfile, '/');
1237 if (dir) {
1238 *dir = 0;
1239 mkdir(freq->tmpfile, 0777);
1240 *dir = '/';
1241 }
1242 freq->localfile = open(freq->tmpfile,
1243 O_WRONLY | O_CREAT | O_EXCL, 0666);
1244 }
1246 if (freq->localfile < 0) {
1247 error("Couldn't create temporary file %s: %s",
1248 freq->tmpfile, strerror(errno));
1249 goto abort;
1250 }
1252 memset(&freq->stream, 0, sizeof(freq->stream));
1254 git_inflate_init(&freq->stream);
1256 git_SHA1_Init(&freq->c);
1258 freq->url = get_remote_object_url(base_url, hex, 0);
1260 /*
1261 * If a previous temp file is present, process what was already
1262 * fetched.
1263 */
1264 prevlocal = open(prevfile, O_RDONLY);
1265 if (prevlocal != -1) {
1266 do {
1267 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1268 if (prev_read>0) {
1269 if (fwrite_sha1_file(prev_buf,
1270 1,
1271 prev_read,
1272 freq) == prev_read) {
1273 prev_posn += prev_read;
1274 } else {
1275 prev_read = -1;
1276 }
1277 }
1278 } while (prev_read > 0);
1279 close(prevlocal);
1280 }
1281 unlink_or_warn(prevfile);
1283 /*
1284 * Reset inflate/SHA1 if there was an error reading the previous temp
1285 * file; also rewind to the beginning of the local file.
1286 */
1287 if (prev_read == -1) {
1288 memset(&freq->stream, 0, sizeof(freq->stream));
1289 git_inflate_init(&freq->stream);
1290 git_SHA1_Init(&freq->c);
1291 if (prev_posn>0) {
1292 prev_posn = 0;
1293 lseek(freq->localfile, 0, SEEK_SET);
1294 if (ftruncate(freq->localfile, 0) < 0) {
1295 error("Couldn't truncate temporary file %s: %s",
1296 freq->tmpfile, strerror(errno));
1297 goto abort;
1298 }
1299 }
1300 }
1302 freq->slot = get_active_slot();
1304 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1305 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1306 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1307 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1308 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1310 /*
1311 * If we have successfully processed data from a previous fetch
1312 * attempt, only fetch the data we don't already have.
1313 */
1314 if (prev_posn>0) {
1315 if (http_is_verbose)
1316 fprintf(stderr,
1317 "Resuming fetch of object %s at byte %ld\n",
1318 hex, prev_posn);
1319 sprintf(range, "Range: bytes=%ld-", prev_posn);
1320 range_header = curl_slist_append(range_header, range);
1321 curl_easy_setopt(freq->slot->curl,
1322 CURLOPT_HTTPHEADER, range_header);
1323 }
1325 return freq;
1327 abort:
1328 free(filename);
1329 free(freq->url);
1330 free(freq);
1331 return NULL;
1332 }
1334 void process_http_object_request(struct http_object_request *freq)
1335 {
1336 if (freq->slot == NULL)
1337 return;
1338 freq->curl_result = freq->slot->curl_result;
1339 freq->http_code = freq->slot->http_code;
1340 freq->slot = NULL;
1341 }
1343 int finish_http_object_request(struct http_object_request *freq)
1344 {
1345 struct stat st;
1347 close(freq->localfile);
1348 freq->localfile = -1;
1350 process_http_object_request(freq);
1352 if (freq->http_code == 416) {
1353 warning("requested range invalid; we may already have all the data.");
1354 } else if (freq->curl_result != CURLE_OK) {
1355 if (stat(freq->tmpfile, &st) == 0)
1356 if (st.st_size == 0)
1357 unlink_or_warn(freq->tmpfile);
1358 return -1;
1359 }
1361 git_inflate_end(&freq->stream);
1362 git_SHA1_Final(freq->real_sha1, &freq->c);
1363 if (freq->zret != Z_STREAM_END) {
1364 unlink_or_warn(freq->tmpfile);
1365 return -1;
1366 }
1367 if (hashcmp(freq->sha1, freq->real_sha1)) {
1368 unlink_or_warn(freq->tmpfile);
1369 return -1;
1370 }
1371 freq->rename =
1372 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1374 return freq->rename;
1375 }
1377 void abort_http_object_request(struct http_object_request *freq)
1378 {
1379 unlink_or_warn(freq->tmpfile);
1381 release_http_object_request(freq);
1382 }
1384 void release_http_object_request(struct http_object_request *freq)
1385 {
1386 if (freq->localfile != -1) {
1387 close(freq->localfile);
1388 freq->localfile = -1;
1389 }
1390 if (freq->url != NULL) {
1391 free(freq->url);
1392 freq->url = NULL;
1393 }
1394 if (freq->slot != NULL) {
1395 freq->slot->callback_func = NULL;
1396 freq->slot->callback_data = NULL;
1397 release_active_slot(freq->slot);
1398 freq->slot = NULL;
1399 }
1400 }