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dir: convert to strbuf
[git/mjg.git] / http.c
blobb2ae8de16db3abe2cad27249ae767f421aa6bb24
1 #include "http.h"
2 #include "pack.h"
3 #include "sideband.h"
4 #include "run-command.h"
5 #include "url.h"
6
7 int data_received;
8 int active_requests;
9 int http_is_verbose;
10 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
11
12 #if LIBCURL_VERSION_NUM >= 0x070a06
13 #define LIBCURL_CAN_HANDLE_AUTH_ANY
14 #endif
15
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
25
26 #define PREV_BUF_SIZE 4096
27 #define RANGE_HEADER_SIZE 30
28
29 char curl_errorstr[CURL_ERROR_SIZE];
30
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;
46
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
54
55 static char *ssl_cert_password;
56 static int ssl_cert_password_required;
57
58 static struct curl_slist *pragma_header;
59 static struct curl_slist *no_pragma_header;
60
61 static struct active_request_slot *active_queue_head;
62
63 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
64 {
65 size_t size = eltsize * nmemb;
66 struct buffer *buffer = buffer_;
67
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;
72
73 return size;
74 }
75
76 #ifndef NO_CURL_IOCTL
77 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
78 {
79 struct buffer *buffer = clientp;
80
81 switch (cmd) {
82 case CURLIOCMD_NOP:
83 return CURLIOE_OK;
84
85 case CURLIOCMD_RESTARTREAD:
86 buffer->posn = 0;
87 return CURLIOE_OK;
88
89 default:
90 return CURLIOE_UNKNOWNCMD;
91 }
92 }
93 #endif
94
95 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
96 {
97 size_t size = eltsize * nmemb;
98 struct strbuf *buffer = buffer_;
99
100 strbuf_add(buffer, ptr, size);
101 data_received++;
102 return size;
103 }
104
105 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
106 {
107 data_received++;
108 return eltsize * nmemb;
109 }
110
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);
117
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
140
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 }
186
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);
193
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 }
200
201 if (!strcmp("http.useragent", var))
202 return git_config_string(&user_agent, var, value);
203
204 /* Fall back on the default ones */
205 return git_default_config(var, value, cb);
206 }
207
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 }
219
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 }
235
236 static CURL *get_curl_handle(void)
237 {
238 CURL *result = curl_easy_init();
239
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 }
249
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
256
257 init_curl_http_auth(result);
258
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);
274
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 }
281
282 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
283 #if LIBCURL_VERSION_NUM >= 0x071301
284 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
285 #elif LIBCURL_VERSION_NUM >= 0x071101
286 curl_easy_setopt(result, CURLOPT_POST301, 1);
287 #endif
288
289 if (getenv("GIT_CURL_VERBOSE"))
290 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
291
292 curl_easy_setopt(result, CURLOPT_USERAGENT,
293 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
294
295 if (curl_ftp_no_epsv)
296 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
297
298 if (curl_http_proxy)
299 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
300
301 return result;
302 }
303
304 static void http_auth_init(const char *url)
305 {
306 char *at, *colon, *cp, *slash, *decoded;
307 int len;
308
309 cp = strstr(url, "://");
310 if (!cp)
311 return;
312
313 /*
314 * Ok, the URL looks like "proto://something". Which one?
315 * "proto://<user>:<pass>@<host>/...",
316 * "proto://<user>@<host>/...", or just
317 * "proto://<host>/..."?
318 */
319 cp += 3;
320 at = strchr(cp, '@');
321 colon = strchr(cp, ':');
322 slash = strchrnul(cp, '/');
323 if (!at || slash <= at)
324 return; /* No credentials */
325 if (!colon || at <= colon) {
326 /* Only username */
327 len = at - cp;
328 user_name = xmalloc(len + 1);
329 memcpy(user_name, cp, len);
330 user_name[len] = '\0';
331 decoded = url_decode(user_name);
332 free(user_name);
333 user_name = decoded;
334 user_pass = NULL;
335 } else {
336 len = colon - cp;
337 user_name = xmalloc(len + 1);
338 memcpy(user_name, cp, len);
339 user_name[len] = '\0';
340 decoded = url_decode(user_name);
341 free(user_name);
342 user_name = decoded;
343 len = at - (colon + 1);
344 user_pass = xmalloc(len + 1);
345 memcpy(user_pass, colon + 1, len);
346 user_pass[len] = '\0';
347 decoded = url_decode(user_pass);
348 free(user_pass);
349 user_pass = decoded;
350 }
351 }
352
353 static void set_from_env(const char **var, const char *envname)
354 {
355 const char *val = getenv(envname);
356 if (val)
357 *var = val;
358 }
359
360 void http_init(struct remote *remote)
361 {
362 char *low_speed_limit;
363 char *low_speed_time;
364
365 http_is_verbose = 0;
366
367 git_config(http_options, NULL);
368
369 curl_global_init(CURL_GLOBAL_ALL);
370
371 if (remote && remote->http_proxy)
372 curl_http_proxy = xstrdup(remote->http_proxy);
373
374 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
375 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
376
377 #ifdef USE_CURL_MULTI
378 {
379 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
380 if (http_max_requests != NULL)
381 max_requests = atoi(http_max_requests);
382 }
383
384 curlm = curl_multi_init();
385 if (curlm == NULL) {
386 fprintf(stderr, "Error creating curl multi handle.\n");
387 exit(1);
388 }
389 #endif
390
391 if (getenv("GIT_SSL_NO_VERIFY"))
392 curl_ssl_verify = 0;
393
394 set_from_env(&ssl_cert, "GIT_SSL_CERT");
395 #if LIBCURL_VERSION_NUM >= 0x070903
396 set_from_env(&ssl_key, "GIT_SSL_KEY");
397 #endif
398 #if LIBCURL_VERSION_NUM >= 0x070908
399 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
400 #endif
401 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
402
403 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
404
405 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
406 if (low_speed_limit != NULL)
407 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
408 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
409 if (low_speed_time != NULL)
410 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
411
412 if (curl_ssl_verify == -1)
413 curl_ssl_verify = 1;
414
415 curl_session_count = 0;
416 #ifdef USE_CURL_MULTI
417 if (max_requests < 1)
418 max_requests = DEFAULT_MAX_REQUESTS;
419 #endif
420
421 if (getenv("GIT_CURL_FTP_NO_EPSV"))
422 curl_ftp_no_epsv = 1;
423
424 if (remote && remote->url && remote->url[0]) {
425 http_auth_init(remote->url[0]);
426 if (!ssl_cert_password_required &&
427 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
428 !prefixcmp(remote->url[0], "https://"))
429 ssl_cert_password_required = 1;
430 }
431
432 #ifndef NO_CURL_EASY_DUPHANDLE
433 curl_default = get_curl_handle();
434 #endif
435 }
436
437 void http_cleanup(void)
438 {
439 struct active_request_slot *slot = active_queue_head;
440
441 while (slot != NULL) {
442 struct active_request_slot *next = slot->next;
443 if (slot->curl != NULL) {
444 #ifdef USE_CURL_MULTI
445 curl_multi_remove_handle(curlm, slot->curl);
446 #endif
447 curl_easy_cleanup(slot->curl);
448 }
449 free(slot);
450 slot = next;
451 }
452 active_queue_head = NULL;
453
454 #ifndef NO_CURL_EASY_DUPHANDLE
455 curl_easy_cleanup(curl_default);
456 #endif
457
458 #ifdef USE_CURL_MULTI
459 curl_multi_cleanup(curlm);
460 #endif
461 curl_global_cleanup();
462
463 curl_slist_free_all(pragma_header);
464 pragma_header = NULL;
465
466 curl_slist_free_all(no_pragma_header);
467 no_pragma_header = NULL;
468
469 if (curl_http_proxy) {
470 free((void *)curl_http_proxy);
471 curl_http_proxy = NULL;
472 }
473
474 if (ssl_cert_password != NULL) {
475 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
476 free(ssl_cert_password);
477 ssl_cert_password = NULL;
478 }
479 ssl_cert_password_required = 0;
480 }
481
482 struct active_request_slot *get_active_slot(void)
483 {
484 struct active_request_slot *slot = active_queue_head;
485 struct active_request_slot *newslot;
486
487 #ifdef USE_CURL_MULTI
488 int num_transfers;
489
490 /* Wait for a slot to open up if the queue is full */
491 while (active_requests >= max_requests) {
492 curl_multi_perform(curlm, &num_transfers);
493 if (num_transfers < active_requests)
494 process_curl_messages();
495 }
496 #endif
497
498 while (slot != NULL && slot->in_use)
499 slot = slot->next;
500
501 if (slot == NULL) {
502 newslot = xmalloc(sizeof(*newslot));
503 newslot->curl = NULL;
504 newslot->in_use = 0;
505 newslot->next = NULL;
506
507 slot = active_queue_head;
508 if (slot == NULL) {
509 active_queue_head = newslot;
510 } else {
511 while (slot->next != NULL)
512 slot = slot->next;
513 slot->next = newslot;
514 }
515 slot = newslot;
516 }
517
518 if (slot->curl == NULL) {
519 #ifdef NO_CURL_EASY_DUPHANDLE
520 slot->curl = get_curl_handle();
521 #else
522 slot->curl = curl_easy_duphandle(curl_default);
523 #endif
524 curl_session_count++;
525 }
526
527 active_requests++;
528 slot->in_use = 1;
529 slot->local = NULL;
530 slot->results = NULL;
531 slot->finished = NULL;
532 slot->callback_data = NULL;
533 slot->callback_func = NULL;
534 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
535 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
536 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
537 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
538 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
539 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
540 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
541 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
542
543 return slot;
544 }
545
546 int start_active_slot(struct active_request_slot *slot)
547 {
548 #ifdef USE_CURL_MULTI
549 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
550 int num_transfers;
551
552 if (curlm_result != CURLM_OK &&
553 curlm_result != CURLM_CALL_MULTI_PERFORM) {
554 active_requests--;
555 slot->in_use = 0;
556 return 0;
557 }
558
559 /*
560 * We know there must be something to do, since we just added
561 * something.
562 */
563 curl_multi_perform(curlm, &num_transfers);
564 #endif
565 return 1;
566 }
567
568 #ifdef USE_CURL_MULTI
569 struct fill_chain {
570 void *data;
571 int (*fill)(void *);
572 struct fill_chain *next;
573 };
574
575 static struct fill_chain *fill_cfg;
576
577 void add_fill_function(void *data, int (*fill)(void *))
578 {
579 struct fill_chain *new = xmalloc(sizeof(*new));
580 struct fill_chain **linkp = &fill_cfg;
581 new->data = data;
582 new->fill = fill;
583 new->next = NULL;
584 while (*linkp)
585 linkp = &(*linkp)->next;
586 *linkp = new;
587 }
588
589 void fill_active_slots(void)
590 {
591 struct active_request_slot *slot = active_queue_head;
592
593 while (active_requests < max_requests) {
594 struct fill_chain *fill;
595 for (fill = fill_cfg; fill; fill = fill->next)
596 if (fill->fill(fill->data))
597 break;
598
599 if (!fill)
600 break;
601 }
602
603 while (slot != NULL) {
604 if (!slot->in_use && slot->curl != NULL
605 && curl_session_count > min_curl_sessions) {
606 curl_easy_cleanup(slot->curl);
607 slot->curl = NULL;
608 curl_session_count--;
609 }
610 slot = slot->next;
611 }
612 }
613
614 void step_active_slots(void)
615 {
616 int num_transfers;
617 CURLMcode curlm_result;
618
619 do {
620 curlm_result = curl_multi_perform(curlm, &num_transfers);
621 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
622 if (num_transfers < active_requests) {
623 process_curl_messages();
624 fill_active_slots();
625 }
626 }
627 #endif
628
629 void run_active_slot(struct active_request_slot *slot)
630 {
631 #ifdef USE_CURL_MULTI
632 long last_pos = 0;
633 long current_pos;
634 fd_set readfds;
635 fd_set writefds;
636 fd_set excfds;
637 int max_fd;
638 struct timeval select_timeout;
639 int finished = 0;
640
641 slot->finished = &finished;
642 while (!finished) {
643 data_received = 0;
644 step_active_slots();
645
646 if (!data_received && slot->local != NULL) {
647 current_pos = ftell(slot->local);
648 if (current_pos > last_pos)
649 data_received++;
650 last_pos = current_pos;
651 }
652
653 if (slot->in_use && !data_received) {
654 max_fd = 0;
655 FD_ZERO(&readfds);
656 FD_ZERO(&writefds);
657 FD_ZERO(&excfds);
658 select_timeout.tv_sec = 0;
659 select_timeout.tv_usec = 50000;
660 select(max_fd, &readfds, &writefds,
661 &excfds, &select_timeout);
662 }
663 }
664 #else
665 while (slot->in_use) {
666 slot->curl_result = curl_easy_perform(slot->curl);
667 finish_active_slot(slot);
668 }
669 #endif
670 }
671
672 static void closedown_active_slot(struct active_request_slot *slot)
673 {
674 active_requests--;
675 slot->in_use = 0;
676 }
677
678 static void release_active_slot(struct active_request_slot *slot)
679 {
680 closedown_active_slot(slot);
681 if (slot->curl && curl_session_count > min_curl_sessions) {
682 #ifdef USE_CURL_MULTI
683 curl_multi_remove_handle(curlm, slot->curl);
684 #endif
685 curl_easy_cleanup(slot->curl);
686 slot->curl = NULL;
687 curl_session_count--;
688 }
689 #ifdef USE_CURL_MULTI
690 fill_active_slots();
691 #endif
692 }
693
694 void finish_active_slot(struct active_request_slot *slot)
695 {
696 closedown_active_slot(slot);
697 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
698
699 if (slot->finished != NULL)
700 (*slot->finished) = 1;
701
702 /* Store slot results so they can be read after the slot is reused */
703 if (slot->results != NULL) {
704 slot->results->curl_result = slot->curl_result;
705 slot->results->http_code = slot->http_code;
706 }
707
708 /* Run callback if appropriate */
709 if (slot->callback_func != NULL)
710 slot->callback_func(slot->callback_data);
711 }
712
713 void finish_all_active_slots(void)
714 {
715 struct active_request_slot *slot = active_queue_head;
716
717 while (slot != NULL)
718 if (slot->in_use) {
719 run_active_slot(slot);
720 slot = active_queue_head;
721 } else {
722 slot = slot->next;
723 }
724 }
725
726 /* Helpers for modifying and creating URLs */
727 static inline int needs_quote(int ch)
728 {
729 if (((ch >= 'A') && (ch <= 'Z'))
730 || ((ch >= 'a') && (ch <= 'z'))
731 || ((ch >= '0') && (ch <= '9'))
732 || (ch == '/')
733 || (ch == '-')
734 || (ch == '.'))
735 return 0;
736 return 1;
737 }
738
739 static inline int hex(int v)
740 {
741 if (v < 10)
742 return '0' + v;
743 else
744 return 'A' + v - 10;
745 }
746
747 static char *quote_ref_url(const char *base, const char *ref)
748 {
749 struct strbuf buf = STRBUF_INIT;
750 const char *cp;
751 int ch;
752
753 end_url_with_slash(&buf, base);
754
755 for (cp = ref; (ch = *cp) != 0; cp++)
756 if (needs_quote(ch))
757 strbuf_addf(&buf, "%%%02x", ch);
758 else
759 strbuf_addch(&buf, *cp);
760
761 return strbuf_detach(&buf, NULL);
762 }
763
764 void append_remote_object_url(struct strbuf *buf, const char *url,
765 const char *hex,
766 int only_two_digit_prefix)
767 {
768 end_url_with_slash(buf, url);
769
770 strbuf_addf(buf, "objects/%.*s/", 2, hex);
771 if (!only_two_digit_prefix)
772 strbuf_addf(buf, "%s", hex+2);
773 }
774
775 char *get_remote_object_url(const char *url, const char *hex,
776 int only_two_digit_prefix)
777 {
778 struct strbuf buf = STRBUF_INIT;
779 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
780 return strbuf_detach(&buf, NULL);
781 }
782
783 /* http_request() targets */
784 #define HTTP_REQUEST_STRBUF 0
785 #define HTTP_REQUEST_FILE 1
786
787 static int http_request(const char *url, void *result, int target, int options)
788 {
789 struct active_request_slot *slot;
790 struct slot_results results;
791 struct curl_slist *headers = NULL;
792 struct strbuf buf = STRBUF_INIT;
793 int ret;
794
795 slot = get_active_slot();
796 slot->results = &results;
797 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
798
799 if (result == NULL) {
800 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
801 } else {
802 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
803 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
804
805 if (target == HTTP_REQUEST_FILE) {
806 long posn = ftell(result);
807 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
808 fwrite);
809 if (posn > 0) {
810 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
811 headers = curl_slist_append(headers, buf.buf);
812 strbuf_reset(&buf);
813 }
814 slot->local = result;
815 } else
816 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
817 fwrite_buffer);
818 }
819
820 strbuf_addstr(&buf, "Pragma:");
821 if (options & HTTP_NO_CACHE)
822 strbuf_addstr(&buf, " no-cache");
823
824 headers = curl_slist_append(headers, buf.buf);
825
826 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
827 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
828
829 if (start_active_slot(slot)) {
830 run_active_slot(slot);
831 if (results.curl_result == CURLE_OK)
832 ret = HTTP_OK;
833 else if (missing_target(&results))
834 ret = HTTP_MISSING_TARGET;
835 else if (results.http_code == 401) {
836 if (user_name) {
837 ret = HTTP_NOAUTH;
838 } else {
839 /*
840 * git_getpass is needed here because its very likely stdin/stdout are
841 * pipes to our parent process. So we instead need to use /dev/tty,
842 * but that is non-portable. Using git_getpass() can at least be stubbed
843 * on other platforms with a different implementation if/when necessary.
844 */
845 user_name = xstrdup(git_getpass("Username: "));
846 init_curl_http_auth(slot->curl);
847 ret = HTTP_REAUTH;
848 }
849 } else
850 ret = HTTP_ERROR;
851 } else {
852 error("Unable to start HTTP request for %s", url);
853 ret = HTTP_START_FAILED;
854 }
855
856 slot->local = NULL;
857 curl_slist_free_all(headers);
858 strbuf_release(&buf);
859
860 return ret;
861 }
862
863 int http_get_strbuf(const char *url, struct strbuf *result, int options)
864 {
865 int http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
866 if (http_ret == HTTP_REAUTH) {
867 http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
868 }
869 return http_ret;
870 }
871
872 /*
873 * Downloads an url and stores the result in the given file.
874 *
875 * If a previous interrupted download is detected (i.e. a previous temporary
876 * file is still around) the download is resumed.
877 */
878 static int http_get_file(const char *url, const char *filename, int options)
879 {
880 int ret;
881 struct strbuf tmpfile = STRBUF_INIT;
882 FILE *result;
883
884 strbuf_addf(&tmpfile, "%s.temp", filename);
885 result = fopen(tmpfile.buf, "a");
886 if (! result) {
887 error("Unable to open local file %s", tmpfile.buf);
888 ret = HTTP_ERROR;
889 goto cleanup;
890 }
891
892 ret = http_request(url, result, HTTP_REQUEST_FILE, options);
893 fclose(result);
894
895 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
896 ret = HTTP_ERROR;
897 cleanup:
898 strbuf_release(&tmpfile);
899 return ret;
900 }
901
902 int http_error(const char *url, int ret)
903 {
904 /* http_request has already handled HTTP_START_FAILED. */
905 if (ret != HTTP_START_FAILED)
906 error("%s while accessing %s\n", curl_errorstr, url);
907
908 return ret;
909 }
910
911 int http_fetch_ref(const char *base, struct ref *ref)
912 {
913 char *url;
914 struct strbuf buffer = STRBUF_INIT;
915 int ret = -1;
916
917 url = quote_ref_url(base, ref->name);
918 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
919 strbuf_rtrim(&buffer);
920 if (buffer.len == 40)
921 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
922 else if (!prefixcmp(buffer.buf, "ref: ")) {
923 ref->symref = xstrdup(buffer.buf + 5);
924 ret = 0;
925 }
926 }
927
928 strbuf_release(&buffer);
929 free(url);
930 return ret;
931 }
932
933 /* Helpers for fetching packs */
934 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
935 {
936 char *url, *tmp;
937 struct strbuf buf = STRBUF_INIT;
938
939 if (http_is_verbose)
940 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
941
942 end_url_with_slash(&buf, base_url);
943 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
944 url = strbuf_detach(&buf, NULL);
945
946 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
947 tmp = strbuf_detach(&buf, NULL);
948
949 if (http_get_file(url, tmp, 0) != HTTP_OK) {
950 error("Unable to get pack index %s\n", url);
951 free(tmp);
952 tmp = NULL;
953 }
954
955 free(url);
956 return tmp;
957 }
958
959 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
960 unsigned char *sha1, const char *base_url)
961 {
962 struct packed_git *new_pack;
963 char *tmp_idx = NULL;
964 int ret;
965
966 if (has_pack_index(sha1)) {
967 new_pack = parse_pack_index(sha1, NULL);
968 if (!new_pack)
969 return -1; /* parse_pack_index() already issued error message */
970 goto add_pack;
971 }
972
973 tmp_idx = fetch_pack_index(sha1, base_url);
974 if (!tmp_idx)
975 return -1;
976
977 new_pack = parse_pack_index(sha1, tmp_idx);
978 if (!new_pack) {
979 unlink(tmp_idx);
980 free(tmp_idx);
981
982 return -1; /* parse_pack_index() already issued error message */
983 }
984
985 ret = verify_pack_index(new_pack);
986 if (!ret) {
987 close_pack_index(new_pack);
988 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
989 }
990 free(tmp_idx);
991 if (ret)
992 return -1;
993
994 add_pack:
995 new_pack->next = *packs_head;
996 *packs_head = new_pack;
997 return 0;
998 }
999
1000 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1001 {
1002 int ret = 0, i = 0;
1003 char *url, *data;
1004 struct strbuf buf = STRBUF_INIT;
1005 unsigned char sha1[20];
1006
1007 end_url_with_slash(&buf, base_url);
1008 strbuf_addstr(&buf, "objects/info/packs");
1009 url = strbuf_detach(&buf, NULL);
1010
1011 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1012 if (ret != HTTP_OK)
1013 goto cleanup;
1014
1015 data = buf.buf;
1016 while (i < buf.len) {
1017 switch (data[i]) {
1018 case 'P':
1019 i++;
1020 if (i + 52 <= buf.len &&
1021 !prefixcmp(data + i, " pack-") &&
1022 !prefixcmp(data + i + 46, ".pack\n")) {
1023 get_sha1_hex(data + i + 6, sha1);
1024 fetch_and_setup_pack_index(packs_head, sha1,
1025 base_url);
1026 i += 51;
1027 break;
1028 }
1029 default:
1030 while (i < buf.len && data[i] != '\n')
1031 i++;
1032 }
1033 i++;
1034 }
1035
1036 cleanup:
1037 free(url);
1038 return ret;
1039 }
1040
1041 void release_http_pack_request(struct http_pack_request *preq)
1042 {
1043 if (preq->packfile != NULL) {
1044 fclose(preq->packfile);
1045 preq->packfile = NULL;
1046 preq->slot->local = NULL;
1047 }
1048 if (preq->range_header != NULL) {
1049 curl_slist_free_all(preq->range_header);
1050 preq->range_header = NULL;
1051 }
1052 preq->slot = NULL;
1053 free(preq->url);
1054 }
1055
1056 int finish_http_pack_request(struct http_pack_request *preq)
1057 {
1058 struct packed_git **lst;
1059 struct packed_git *p = preq->target;
1060 char *tmp_idx;
1061 struct child_process ip;
1062 const char *ip_argv[8];
1063
1064 close_pack_index(p);
1065
1066 fclose(preq->packfile);
1067 preq->packfile = NULL;
1068 preq->slot->local = NULL;
1069
1070 lst = preq->lst;
1071 while (*lst != p)
1072 lst = &((*lst)->next);
1073 *lst = (*lst)->next;
1074
1075 tmp_idx = xstrdup(preq->tmpfile);
1076 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1077 ".idx.temp");
1078
1079 ip_argv[0] = "index-pack";
1080 ip_argv[1] = "-o";
1081 ip_argv[2] = tmp_idx;
1082 ip_argv[3] = preq->tmpfile;
1083 ip_argv[4] = NULL;
1084
1085 memset(&ip, 0, sizeof(ip));
1086 ip.argv = ip_argv;
1087 ip.git_cmd = 1;
1088 ip.no_stdin = 1;
1089 ip.no_stdout = 1;
1090
1091 if (run_command(&ip)) {
1092 unlink(preq->tmpfile);
1093 unlink(tmp_idx);
1094 free(tmp_idx);
1095 return -1;
1096 }
1097
1098 unlink(sha1_pack_index_name(p->sha1));
1099
1100 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1101 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1102 free(tmp_idx);
1103 return -1;
1104 }
1105
1106 install_packed_git(p);
1107 free(tmp_idx);
1108 return 0;
1109 }
1110
1111 struct http_pack_request *new_http_pack_request(
1112 struct packed_git *target, const char *base_url)
1113 {
1114 long prev_posn = 0;
1115 char range[RANGE_HEADER_SIZE];
1116 struct strbuf buf = STRBUF_INIT;
1117 struct http_pack_request *preq;
1118
1119 preq = xmalloc(sizeof(*preq));
1120 preq->target = target;
1121 preq->range_header = NULL;
1122
1123 end_url_with_slash(&buf, base_url);
1124 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1125 sha1_to_hex(target->sha1));
1126 preq->url = strbuf_detach(&buf, NULL);
1127
1128 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1129 sha1_pack_name(target->sha1));
1130 preq->packfile = fopen(preq->tmpfile, "a");
1131 if (!preq->packfile) {
1132 error("Unable to open local file %s for pack",
1133 preq->tmpfile);
1134 goto abort;
1135 }
1136
1137 preq->slot = get_active_slot();
1138 preq->slot->local = preq->packfile;
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 data_received++;
1196 return size;
1197 }
1198
1199 struct http_object_request *new_http_object_request(const char *base_url,
1200 unsigned char *sha1)
1201 {
1202 char *hex = sha1_to_hex(sha1);
1203 char *filename;
1204 char prevfile[PATH_MAX];
1205 int prevlocal;
1206 char prev_buf[PREV_BUF_SIZE];
1207 ssize_t prev_read = 0;
1208 long prev_posn = 0;
1209 char range[RANGE_HEADER_SIZE];
1210 struct curl_slist *range_header = NULL;
1211 struct http_object_request *freq;
1212
1213 freq = xmalloc(sizeof(*freq));
1214 hashcpy(freq->sha1, sha1);
1215 freq->localfile = -1;
1216
1217 filename = sha1_file_name(sha1);
1218 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1219 "%s.temp", filename);
1220
1221 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1222 unlink_or_warn(prevfile);
1223 rename(freq->tmpfile, prevfile);
1224 unlink_or_warn(freq->tmpfile);
1225
1226 if (freq->localfile != -1)
1227 error("fd leakage in start: %d", freq->localfile);
1228 freq->localfile = open(freq->tmpfile,
1229 O_WRONLY | O_CREAT | O_EXCL, 0666);
1230 /*
1231 * This could have failed due to the "lazy directory creation";
1232 * try to mkdir the last path component.
1233 */
1234 if (freq->localfile < 0 && errno == ENOENT) {
1235 char *dir = strrchr(freq->tmpfile, '/');
1236 if (dir) {
1237 *dir = 0;
1238 mkdir(freq->tmpfile, 0777);
1239 *dir = '/';
1240 }
1241 freq->localfile = open(freq->tmpfile,
1242 O_WRONLY | O_CREAT | O_EXCL, 0666);
1243 }
1244
1245 if (freq->localfile < 0) {
1246 error("Couldn't create temporary file %s: %s",
1247 freq->tmpfile, strerror(errno));
1248 goto abort;
1249 }
1250
1251 memset(&freq->stream, 0, sizeof(freq->stream));
1252
1253 git_inflate_init(&freq->stream);
1254
1255 git_SHA1_Init(&freq->c);
1256
1257 freq->url = get_remote_object_url(base_url, hex, 0);
1258
1259 /*
1260 * If a previous temp file is present, process what was already
1261 * fetched.
1262 */
1263 prevlocal = open(prevfile, O_RDONLY);
1264 if (prevlocal != -1) {
1265 do {
1266 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1267 if (prev_read>0) {
1268 if (fwrite_sha1_file(prev_buf,
1269 1,
1270 prev_read,
1271 freq) == prev_read) {
1272 prev_posn += prev_read;
1273 } else {
1274 prev_read = -1;
1275 }
1276 }
1277 } while (prev_read > 0);
1278 close(prevlocal);
1279 }
1280 unlink_or_warn(prevfile);
1281
1282 /*
1283 * Reset inflate/SHA1 if there was an error reading the previous temp
1284 * file; also rewind to the beginning of the local file.
1285 */
1286 if (prev_read == -1) {
1287 memset(&freq->stream, 0, sizeof(freq->stream));
1288 git_inflate_init(&freq->stream);
1289 git_SHA1_Init(&freq->c);
1290 if (prev_posn>0) {
1291 prev_posn = 0;
1292 lseek(freq->localfile, 0, SEEK_SET);
1293 if (ftruncate(freq->localfile, 0) < 0) {
1294 error("Couldn't truncate temporary file %s: %s",
1295 freq->tmpfile, strerror(errno));
1296 goto abort;
1297 }
1298 }
1299 }
1300
1301 freq->slot = get_active_slot();
1302
1303 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1304 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1305 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1306 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1307 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1308
1309 /*
1310 * If we have successfully processed data from a previous fetch
1311 * attempt, only fetch the data we don't already have.
1312 */
1313 if (prev_posn>0) {
1314 if (http_is_verbose)
1315 fprintf(stderr,
1316 "Resuming fetch of object %s at byte %ld\n",
1317 hex, prev_posn);
1318 sprintf(range, "Range: bytes=%ld-", prev_posn);
1319 range_header = curl_slist_append(range_header, range);
1320 curl_easy_setopt(freq->slot->curl,
1321 CURLOPT_HTTPHEADER, range_header);
1322 }
1323
1324 return freq;
1325
1326 abort:
1327 free(filename);
1328 free(freq->url);
1329 free(freq);
1330 return NULL;
1331 }
1332
1333 void process_http_object_request(struct http_object_request *freq)
1334 {
1335 if (freq->slot == NULL)
1336 return;
1337 freq->curl_result = freq->slot->curl_result;
1338 freq->http_code = freq->slot->http_code;
1339 freq->slot = NULL;
1340 }
1341
1342 int finish_http_object_request(struct http_object_request *freq)
1343 {
1344 struct stat st;
1345
1346 close(freq->localfile);
1347 freq->localfile = -1;
1348
1349 process_http_object_request(freq);
1350
1351 if (freq->http_code == 416) {
1352 warning("requested range invalid; we may already have all the data.");
1353 } else if (freq->curl_result != CURLE_OK) {
1354 if (stat(freq->tmpfile, &st) == 0)
1355 if (st.st_size == 0)
1356 unlink_or_warn(freq->tmpfile);
1357 return -1;
1358 }
1359
1360 git_inflate_end(&freq->stream);
1361 git_SHA1_Final(freq->real_sha1, &freq->c);
1362 if (freq->zret != Z_STREAM_END) {
1363 unlink_or_warn(freq->tmpfile);
1364 return -1;
1365 }
1366 if (hashcmp(freq->sha1, freq->real_sha1)) {
1367 unlink_or_warn(freq->tmpfile);
1368 return -1;
1369 }
1370 freq->rename =
1371 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1372
1373 return freq->rename;
1374 }
1375
1376 void abort_http_object_request(struct http_object_request *freq)
1377 {
1378 unlink_or_warn(freq->tmpfile);
1379
1380 release_http_object_request(freq);
1381 }
1382
1383 void release_http_object_request(struct http_object_request *freq)
1384 {
1385 if (freq->localfile != -1) {
1386 close(freq->localfile);
1387 freq->localfile = -1;
1388 }
1389 if (freq->url != NULL) {
1390 free(freq->url);
1391 freq->url = NULL;
1392 }
1393 if (freq->slot != NULL) {
1394 freq->slot->callback_func = NULL;
1395 freq->slot->callback_data = NULL;
1396 release_active_slot(freq->slot);
1397 freq->slot = NULL;
1398 }
1399 }
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