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verify_lock(): report errors via a strbuf
[alt-git.git] / http.c
blobf0c5bbc8b59768bb7b177494861d5f548b25fbb1
1 #include "git-compat-util.h"
2 #include "http.h"
3 #include "pack.h"
4 #include "sideband.h"
5 #include "run-command.h"
6 #include "url.h"
7 #include "urlmatch.h"
8 #include "credential.h"
9 #include "version.h"
10 #include "pkt-line.h"
11 #include "gettext.h"
12
13 int active_requests;
14 int http_is_verbose;
15 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
16
17 #if LIBCURL_VERSION_NUM >= 0x070a06
18 #define LIBCURL_CAN_HANDLE_AUTH_ANY
19 #endif
20
21 static int min_curl_sessions = 1;
22 static int curl_session_count;
23 #ifdef USE_CURL_MULTI
24 static int max_requests = -1;
25 static CURLM *curlm;
26 #endif
27 #ifndef NO_CURL_EASY_DUPHANDLE
28 static CURL *curl_default;
29 #endif
30
31 #define PREV_BUF_SIZE 4096
32 #define RANGE_HEADER_SIZE 30
33
34 char curl_errorstr[CURL_ERROR_SIZE];
35
36 static int curl_ssl_verify = -1;
37 static int curl_ssl_try;
38 static const char *ssl_cert;
39 static const char *ssl_cipherlist;
40 #if LIBCURL_VERSION_NUM >= 0x070903
41 static const char *ssl_key;
42 #endif
43 #if LIBCURL_VERSION_NUM >= 0x070908
44 static const char *ssl_capath;
45 #endif
46 static const char *ssl_cainfo;
47 static long curl_low_speed_limit = -1;
48 static long curl_low_speed_time = -1;
49 static int curl_ftp_no_epsv;
50 static const char *curl_http_proxy;
51 static const char *curl_cookie_file;
52 static int curl_save_cookies;
53 struct credential http_auth = CREDENTIAL_INIT;
54 static int http_proactive_auth;
55 static const char *user_agent;
56
57 #if LIBCURL_VERSION_NUM >= 0x071700
58 /* Use CURLOPT_KEYPASSWD as is */
59 #elif LIBCURL_VERSION_NUM >= 0x070903
60 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
61 #else
62 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
63 #endif
64
65 static struct credential cert_auth = CREDENTIAL_INIT;
66 static int ssl_cert_password_required;
67 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
68 static unsigned long http_auth_methods = CURLAUTH_ANY;
69 #endif
70
71 static struct curl_slist *pragma_header;
72 static struct curl_slist *no_pragma_header;
73
74 static struct active_request_slot *active_queue_head;
75
76 static char *cached_accept_language;
77
78 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
79 {
80 size_t size = eltsize * nmemb;
81 struct buffer *buffer = buffer_;
82
83 if (size > buffer->buf.len - buffer->posn)
84 size = buffer->buf.len - buffer->posn;
85 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
86 buffer->posn += size;
87
88 return size;
89 }
90
91 #ifndef NO_CURL_IOCTL
92 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
93 {
94 struct buffer *buffer = clientp;
95
96 switch (cmd) {
97 case CURLIOCMD_NOP:
98 return CURLIOE_OK;
99
100 case CURLIOCMD_RESTARTREAD:
101 buffer->posn = 0;
102 return CURLIOE_OK;
103
104 default:
105 return CURLIOE_UNKNOWNCMD;
106 }
107 }
108 #endif
109
110 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
111 {
112 size_t size = eltsize * nmemb;
113 struct strbuf *buffer = buffer_;
114
115 strbuf_add(buffer, ptr, size);
116 return size;
117 }
118
119 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
120 {
121 return eltsize * nmemb;
122 }
123
124 static void closedown_active_slot(struct active_request_slot *slot)
125 {
126 active_requests--;
127 slot->in_use = 0;
128 }
129
130 static void finish_active_slot(struct active_request_slot *slot)
131 {
132 closedown_active_slot(slot);
133 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
134
135 if (slot->finished != NULL)
136 (*slot->finished) = 1;
137
138 /* Store slot results so they can be read after the slot is reused */
139 if (slot->results != NULL) {
140 slot->results->curl_result = slot->curl_result;
141 slot->results->http_code = slot->http_code;
142 #if LIBCURL_VERSION_NUM >= 0x070a08
143 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
144 &slot->results->auth_avail);
145 #else
146 slot->results->auth_avail = 0;
147 #endif
148 }
149
150 /* Run callback if appropriate */
151 if (slot->callback_func != NULL)
152 slot->callback_func(slot->callback_data);
153 }
154
155 #ifdef USE_CURL_MULTI
156 static void process_curl_messages(void)
157 {
158 int num_messages;
159 struct active_request_slot *slot;
160 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
161
162 while (curl_message != NULL) {
163 if (curl_message->msg == CURLMSG_DONE) {
164 int curl_result = curl_message->data.result;
165 slot = active_queue_head;
166 while (slot != NULL &&
167 slot->curl != curl_message->easy_handle)
168 slot = slot->next;
169 if (slot != NULL) {
170 curl_multi_remove_handle(curlm, slot->curl);
171 slot->curl_result = curl_result;
172 finish_active_slot(slot);
173 } else {
174 fprintf(stderr, "Received DONE message for unknown request!\n");
175 }
176 } else {
177 fprintf(stderr, "Unknown CURL message received: %d\n",
178 (int)curl_message->msg);
179 }
180 curl_message = curl_multi_info_read(curlm, &num_messages);
181 }
182 }
183 #endif
184
185 static int http_options(const char *var, const char *value, void *cb)
186 {
187 if (!strcmp("http.sslverify", var)) {
188 curl_ssl_verify = git_config_bool(var, value);
189 return 0;
190 }
191 if (!strcmp("http.sslcipherlist", var))
192 return git_config_string(&ssl_cipherlist, var, value);
193 if (!strcmp("http.sslcert", var))
194 return git_config_string(&ssl_cert, var, value);
195 #if LIBCURL_VERSION_NUM >= 0x070903
196 if (!strcmp("http.sslkey", var))
197 return git_config_string(&ssl_key, var, value);
198 #endif
199 #if LIBCURL_VERSION_NUM >= 0x070908
200 if (!strcmp("http.sslcapath", var))
201 return git_config_string(&ssl_capath, var, value);
202 #endif
203 if (!strcmp("http.sslcainfo", var))
204 return git_config_string(&ssl_cainfo, var, value);
205 if (!strcmp("http.sslcertpasswordprotected", var)) {
206 ssl_cert_password_required = git_config_bool(var, value);
207 return 0;
208 }
209 if (!strcmp("http.ssltry", var)) {
210 curl_ssl_try = git_config_bool(var, value);
211 return 0;
212 }
213 if (!strcmp("http.minsessions", var)) {
214 min_curl_sessions = git_config_int(var, value);
215 #ifndef USE_CURL_MULTI
216 if (min_curl_sessions > 1)
217 min_curl_sessions = 1;
218 #endif
219 return 0;
220 }
221 #ifdef USE_CURL_MULTI
222 if (!strcmp("http.maxrequests", var)) {
223 max_requests = git_config_int(var, value);
224 return 0;
225 }
226 #endif
227 if (!strcmp("http.lowspeedlimit", var)) {
228 curl_low_speed_limit = (long)git_config_int(var, value);
229 return 0;
230 }
231 if (!strcmp("http.lowspeedtime", var)) {
232 curl_low_speed_time = (long)git_config_int(var, value);
233 return 0;
234 }
235
236 if (!strcmp("http.noepsv", var)) {
237 curl_ftp_no_epsv = git_config_bool(var, value);
238 return 0;
239 }
240 if (!strcmp("http.proxy", var))
241 return git_config_string(&curl_http_proxy, var, value);
242
243 if (!strcmp("http.cookiefile", var))
244 return git_config_string(&curl_cookie_file, var, value);
245 if (!strcmp("http.savecookies", var)) {
246 curl_save_cookies = git_config_bool(var, value);
247 return 0;
248 }
249
250 if (!strcmp("http.postbuffer", var)) {
251 http_post_buffer = git_config_int(var, value);
252 if (http_post_buffer < LARGE_PACKET_MAX)
253 http_post_buffer = LARGE_PACKET_MAX;
254 return 0;
255 }
256
257 if (!strcmp("http.useragent", var))
258 return git_config_string(&user_agent, var, value);
259
260 /* Fall back on the default ones */
261 return git_default_config(var, value, cb);
262 }
263
264 static void init_curl_http_auth(CURL *result)
265 {
266 if (!http_auth.username)
267 return;
268
269 credential_fill(&http_auth);
270
271 #if LIBCURL_VERSION_NUM >= 0x071301
272 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
273 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
274 #else
275 {
276 static struct strbuf up = STRBUF_INIT;
277 /*
278 * Note that we assume we only ever have a single set of
279 * credentials in a given program run, so we do not have
280 * to worry about updating this buffer, only setting its
281 * initial value.
282 */
283 if (!up.len)
284 strbuf_addf(&up, "%s:%s",
285 http_auth.username, http_auth.password);
286 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
287 }
288 #endif
289 }
290
291 static int has_cert_password(void)
292 {
293 if (ssl_cert == NULL || ssl_cert_password_required != 1)
294 return 0;
295 if (!cert_auth.password) {
296 cert_auth.protocol = xstrdup("cert");
297 cert_auth.username = xstrdup("");
298 cert_auth.path = xstrdup(ssl_cert);
299 credential_fill(&cert_auth);
300 }
301 return 1;
302 }
303
304 #if LIBCURL_VERSION_NUM >= 0x071900
305 static void set_curl_keepalive(CURL *c)
306 {
307 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
308 }
309
310 #elif LIBCURL_VERSION_NUM >= 0x071000
311 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
312 {
313 int ka = 1;
314 int rc;
315 socklen_t len = (socklen_t)sizeof(ka);
316
317 if (type != CURLSOCKTYPE_IPCXN)
318 return 0;
319
320 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
321 if (rc < 0)
322 warning("unable to set SO_KEEPALIVE on socket %s",
323 strerror(errno));
324
325 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
326 }
327
328 static void set_curl_keepalive(CURL *c)
329 {
330 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
331 }
332
333 #else
334 static void set_curl_keepalive(CURL *c)
335 {
336 /* not supported on older curl versions */
337 }
338 #endif
339
340 static CURL *get_curl_handle(void)
341 {
342 CURL *result = curl_easy_init();
343
344 if (!result)
345 die("curl_easy_init failed");
346
347 if (!curl_ssl_verify) {
348 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
349 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
350 } else {
351 /* Verify authenticity of the peer's certificate */
352 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
353 /* The name in the cert must match whom we tried to connect */
354 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
355 }
356
357 #if LIBCURL_VERSION_NUM >= 0x070907
358 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
359 #endif
360 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
361 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
362 #endif
363
364 if (http_proactive_auth)
365 init_curl_http_auth(result);
366
367 if (getenv("GIT_SSL_CIPHER_LIST"))
368 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
369
370 if (ssl_cipherlist != NULL && *ssl_cipherlist)
371 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
372 ssl_cipherlist);
373
374 if (ssl_cert != NULL)
375 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
376 if (has_cert_password())
377 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
378 #if LIBCURL_VERSION_NUM >= 0x070903
379 if (ssl_key != NULL)
380 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
381 #endif
382 #if LIBCURL_VERSION_NUM >= 0x070908
383 if (ssl_capath != NULL)
384 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
385 #endif
386 if (ssl_cainfo != NULL)
387 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
388
389 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
390 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
391 curl_low_speed_limit);
392 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
393 curl_low_speed_time);
394 }
395
396 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
397 #if LIBCURL_VERSION_NUM >= 0x071301
398 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
399 #elif LIBCURL_VERSION_NUM >= 0x071101
400 curl_easy_setopt(result, CURLOPT_POST301, 1);
401 #endif
402
403 if (getenv("GIT_CURL_VERBOSE"))
404 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
405
406 curl_easy_setopt(result, CURLOPT_USERAGENT,
407 user_agent ? user_agent : git_user_agent());
408
409 if (curl_ftp_no_epsv)
410 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
411
412 #ifdef CURLOPT_USE_SSL
413 if (curl_ssl_try)
414 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
415 #endif
416
417 if (curl_http_proxy) {
418 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
419 #if LIBCURL_VERSION_NUM >= 0x070a07
420 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
421 #endif
422 }
423
424 set_curl_keepalive(result);
425
426 return result;
427 }
428
429 static void set_from_env(const char **var, const char *envname)
430 {
431 const char *val = getenv(envname);
432 if (val)
433 *var = val;
434 }
435
436 void http_init(struct remote *remote, const char *url, int proactive_auth)
437 {
438 char *low_speed_limit;
439 char *low_speed_time;
440 char *normalized_url;
441 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
442
443 config.section = "http";
444 config.key = NULL;
445 config.collect_fn = http_options;
446 config.cascade_fn = git_default_config;
447 config.cb = NULL;
448
449 http_is_verbose = 0;
450 normalized_url = url_normalize(url, &config.url);
451
452 git_config(urlmatch_config_entry, &config);
453 free(normalized_url);
454
455 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
456 die("curl_global_init failed");
457
458 http_proactive_auth = proactive_auth;
459
460 if (remote && remote->http_proxy)
461 curl_http_proxy = xstrdup(remote->http_proxy);
462
463 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
464 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
465
466 #ifdef USE_CURL_MULTI
467 {
468 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
469 if (http_max_requests != NULL)
470 max_requests = atoi(http_max_requests);
471 }
472
473 curlm = curl_multi_init();
474 if (!curlm)
475 die("curl_multi_init failed");
476 #endif
477
478 if (getenv("GIT_SSL_NO_VERIFY"))
479 curl_ssl_verify = 0;
480
481 set_from_env(&ssl_cert, "GIT_SSL_CERT");
482 #if LIBCURL_VERSION_NUM >= 0x070903
483 set_from_env(&ssl_key, "GIT_SSL_KEY");
484 #endif
485 #if LIBCURL_VERSION_NUM >= 0x070908
486 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
487 #endif
488 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
489
490 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
491
492 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
493 if (low_speed_limit != NULL)
494 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
495 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
496 if (low_speed_time != NULL)
497 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
498
499 if (curl_ssl_verify == -1)
500 curl_ssl_verify = 1;
501
502 curl_session_count = 0;
503 #ifdef USE_CURL_MULTI
504 if (max_requests < 1)
505 max_requests = DEFAULT_MAX_REQUESTS;
506 #endif
507
508 if (getenv("GIT_CURL_FTP_NO_EPSV"))
509 curl_ftp_no_epsv = 1;
510
511 if (url) {
512 credential_from_url(&http_auth, url);
513 if (!ssl_cert_password_required &&
514 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
515 starts_with(url, "https://"))
516 ssl_cert_password_required = 1;
517 }
518
519 #ifndef NO_CURL_EASY_DUPHANDLE
520 curl_default = get_curl_handle();
521 #endif
522 }
523
524 void http_cleanup(void)
525 {
526 struct active_request_slot *slot = active_queue_head;
527
528 while (slot != NULL) {
529 struct active_request_slot *next = slot->next;
530 if (slot->curl != NULL) {
531 #ifdef USE_CURL_MULTI
532 curl_multi_remove_handle(curlm, slot->curl);
533 #endif
534 curl_easy_cleanup(slot->curl);
535 }
536 free(slot);
537 slot = next;
538 }
539 active_queue_head = NULL;
540
541 #ifndef NO_CURL_EASY_DUPHANDLE
542 curl_easy_cleanup(curl_default);
543 #endif
544
545 #ifdef USE_CURL_MULTI
546 curl_multi_cleanup(curlm);
547 #endif
548 curl_global_cleanup();
549
550 curl_slist_free_all(pragma_header);
551 pragma_header = NULL;
552
553 curl_slist_free_all(no_pragma_header);
554 no_pragma_header = NULL;
555
556 if (curl_http_proxy) {
557 free((void *)curl_http_proxy);
558 curl_http_proxy = NULL;
559 }
560
561 if (cert_auth.password != NULL) {
562 memset(cert_auth.password, 0, strlen(cert_auth.password));
563 free(cert_auth.password);
564 cert_auth.password = NULL;
565 }
566 ssl_cert_password_required = 0;
567
568 free(cached_accept_language);
569 cached_accept_language = NULL;
570 }
571
572 struct active_request_slot *get_active_slot(void)
573 {
574 struct active_request_slot *slot = active_queue_head;
575 struct active_request_slot *newslot;
576
577 #ifdef USE_CURL_MULTI
578 int num_transfers;
579
580 /* Wait for a slot to open up if the queue is full */
581 while (active_requests >= max_requests) {
582 curl_multi_perform(curlm, &num_transfers);
583 if (num_transfers < active_requests)
584 process_curl_messages();
585 }
586 #endif
587
588 while (slot != NULL && slot->in_use)
589 slot = slot->next;
590
591 if (slot == NULL) {
592 newslot = xmalloc(sizeof(*newslot));
593 newslot->curl = NULL;
594 newslot->in_use = 0;
595 newslot->next = NULL;
596
597 slot = active_queue_head;
598 if (slot == NULL) {
599 active_queue_head = newslot;
600 } else {
601 while (slot->next != NULL)
602 slot = slot->next;
603 slot->next = newslot;
604 }
605 slot = newslot;
606 }
607
608 if (slot->curl == NULL) {
609 #ifdef NO_CURL_EASY_DUPHANDLE
610 slot->curl = get_curl_handle();
611 #else
612 slot->curl = curl_easy_duphandle(curl_default);
613 #endif
614 curl_session_count++;
615 }
616
617 active_requests++;
618 slot->in_use = 1;
619 slot->results = NULL;
620 slot->finished = NULL;
621 slot->callback_data = NULL;
622 slot->callback_func = NULL;
623 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
624 if (curl_save_cookies)
625 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
626 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
627 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
628 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
629 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
630 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
631 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
632 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
633 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
634 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
635 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
636 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
637 #endif
638 if (http_auth.password)
639 init_curl_http_auth(slot->curl);
640
641 return slot;
642 }
643
644 int start_active_slot(struct active_request_slot *slot)
645 {
646 #ifdef USE_CURL_MULTI
647 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
648 int num_transfers;
649
650 if (curlm_result != CURLM_OK &&
651 curlm_result != CURLM_CALL_MULTI_PERFORM) {
652 active_requests--;
653 slot->in_use = 0;
654 return 0;
655 }
656
657 /*
658 * We know there must be something to do, since we just added
659 * something.
660 */
661 curl_multi_perform(curlm, &num_transfers);
662 #endif
663 return 1;
664 }
665
666 #ifdef USE_CURL_MULTI
667 struct fill_chain {
668 void *data;
669 int (*fill)(void *);
670 struct fill_chain *next;
671 };
672
673 static struct fill_chain *fill_cfg;
674
675 void add_fill_function(void *data, int (*fill)(void *))
676 {
677 struct fill_chain *new = xmalloc(sizeof(*new));
678 struct fill_chain **linkp = &fill_cfg;
679 new->data = data;
680 new->fill = fill;
681 new->next = NULL;
682 while (*linkp)
683 linkp = &(*linkp)->next;
684 *linkp = new;
685 }
686
687 void fill_active_slots(void)
688 {
689 struct active_request_slot *slot = active_queue_head;
690
691 while (active_requests < max_requests) {
692 struct fill_chain *fill;
693 for (fill = fill_cfg; fill; fill = fill->next)
694 if (fill->fill(fill->data))
695 break;
696
697 if (!fill)
698 break;
699 }
700
701 while (slot != NULL) {
702 if (!slot->in_use && slot->curl != NULL
703 && curl_session_count > min_curl_sessions) {
704 curl_easy_cleanup(slot->curl);
705 slot->curl = NULL;
706 curl_session_count--;
707 }
708 slot = slot->next;
709 }
710 }
711
712 void step_active_slots(void)
713 {
714 int num_transfers;
715 CURLMcode curlm_result;
716
717 do {
718 curlm_result = curl_multi_perform(curlm, &num_transfers);
719 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
720 if (num_transfers < active_requests) {
721 process_curl_messages();
722 fill_active_slots();
723 }
724 }
725 #endif
726
727 void run_active_slot(struct active_request_slot *slot)
728 {
729 #ifdef USE_CURL_MULTI
730 fd_set readfds;
731 fd_set writefds;
732 fd_set excfds;
733 int max_fd;
734 struct timeval select_timeout;
735 int finished = 0;
736
737 slot->finished = &finished;
738 while (!finished) {
739 step_active_slots();
740
741 if (slot->in_use) {
742 #if LIBCURL_VERSION_NUM >= 0x070f04
743 long curl_timeout;
744 curl_multi_timeout(curlm, &curl_timeout);
745 if (curl_timeout == 0) {
746 continue;
747 } else if (curl_timeout == -1) {
748 select_timeout.tv_sec = 0;
749 select_timeout.tv_usec = 50000;
750 } else {
751 select_timeout.tv_sec = curl_timeout / 1000;
752 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
753 }
754 #else
755 select_timeout.tv_sec = 0;
756 select_timeout.tv_usec = 50000;
757 #endif
758
759 max_fd = -1;
760 FD_ZERO(&readfds);
761 FD_ZERO(&writefds);
762 FD_ZERO(&excfds);
763 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
764
765 /*
766 * It can happen that curl_multi_timeout returns a pathologically
767 * long timeout when curl_multi_fdset returns no file descriptors
768 * to read. See commit message for more details.
769 */
770 if (max_fd < 0 &&
771 (select_timeout.tv_sec > 0 ||
772 select_timeout.tv_usec > 50000)) {
773 select_timeout.tv_sec = 0;
774 select_timeout.tv_usec = 50000;
775 }
776
777 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
778 }
779 }
780 #else
781 while (slot->in_use) {
782 slot->curl_result = curl_easy_perform(slot->curl);
783 finish_active_slot(slot);
784 }
785 #endif
786 }
787
788 static void release_active_slot(struct active_request_slot *slot)
789 {
790 closedown_active_slot(slot);
791 if (slot->curl && curl_session_count > min_curl_sessions) {
792 #ifdef USE_CURL_MULTI
793 curl_multi_remove_handle(curlm, slot->curl);
794 #endif
795 curl_easy_cleanup(slot->curl);
796 slot->curl = NULL;
797 curl_session_count--;
798 }
799 #ifdef USE_CURL_MULTI
800 fill_active_slots();
801 #endif
802 }
803
804 void finish_all_active_slots(void)
805 {
806 struct active_request_slot *slot = active_queue_head;
807
808 while (slot != NULL)
809 if (slot->in_use) {
810 run_active_slot(slot);
811 slot = active_queue_head;
812 } else {
813 slot = slot->next;
814 }
815 }
816
817 /* Helpers for modifying and creating URLs */
818 static inline int needs_quote(int ch)
819 {
820 if (((ch >= 'A') && (ch <= 'Z'))
821 || ((ch >= 'a') && (ch <= 'z'))
822 || ((ch >= '0') && (ch <= '9'))
823 || (ch == '/')
824 || (ch == '-')
825 || (ch == '.'))
826 return 0;
827 return 1;
828 }
829
830 static char *quote_ref_url(const char *base, const char *ref)
831 {
832 struct strbuf buf = STRBUF_INIT;
833 const char *cp;
834 int ch;
835
836 end_url_with_slash(&buf, base);
837
838 for (cp = ref; (ch = *cp) != 0; cp++)
839 if (needs_quote(ch))
840 strbuf_addf(&buf, "%%%02x", ch);
841 else
842 strbuf_addch(&buf, *cp);
843
844 return strbuf_detach(&buf, NULL);
845 }
846
847 void append_remote_object_url(struct strbuf *buf, const char *url,
848 const char *hex,
849 int only_two_digit_prefix)
850 {
851 end_url_with_slash(buf, url);
852
853 strbuf_addf(buf, "objects/%.*s/", 2, hex);
854 if (!only_two_digit_prefix)
855 strbuf_addf(buf, "%s", hex+2);
856 }
857
858 char *get_remote_object_url(const char *url, const char *hex,
859 int only_two_digit_prefix)
860 {
861 struct strbuf buf = STRBUF_INIT;
862 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
863 return strbuf_detach(&buf, NULL);
864 }
865
866 static int handle_curl_result(struct slot_results *results)
867 {
868 /*
869 * If we see a failing http code with CURLE_OK, we have turned off
870 * FAILONERROR (to keep the server's custom error response), and should
871 * translate the code into failure here.
872 */
873 if (results->curl_result == CURLE_OK &&
874 results->http_code >= 400) {
875 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
876 /*
877 * Normally curl will already have put the "reason phrase"
878 * from the server into curl_errorstr; unfortunately without
879 * FAILONERROR it is lost, so we can give only the numeric
880 * status code.
881 */
882 snprintf(curl_errorstr, sizeof(curl_errorstr),
883 "The requested URL returned error: %ld",
884 results->http_code);
885 }
886
887 if (results->curl_result == CURLE_OK) {
888 credential_approve(&http_auth);
889 return HTTP_OK;
890 } else if (missing_target(results))
891 return HTTP_MISSING_TARGET;
892 else if (results->http_code == 401) {
893 if (http_auth.username && http_auth.password) {
894 credential_reject(&http_auth);
895 return HTTP_NOAUTH;
896 } else {
897 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
898 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
899 #endif
900 return HTTP_REAUTH;
901 }
902 } else {
903 #if LIBCURL_VERSION_NUM >= 0x070c00
904 if (!curl_errorstr[0])
905 strlcpy(curl_errorstr,
906 curl_easy_strerror(results->curl_result),
907 sizeof(curl_errorstr));
908 #endif
909 return HTTP_ERROR;
910 }
911 }
912
913 int run_one_slot(struct active_request_slot *slot,
914 struct slot_results *results)
915 {
916 slot->results = results;
917 if (!start_active_slot(slot)) {
918 snprintf(curl_errorstr, sizeof(curl_errorstr),
919 "failed to start HTTP request");
920 return HTTP_START_FAILED;
921 }
922
923 run_active_slot(slot);
924 return handle_curl_result(results);
925 }
926
927 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
928 {
929 char *ptr;
930 CURLcode ret;
931
932 strbuf_reset(buf);
933 ret = curl_easy_getinfo(curl, info, &ptr);
934 if (!ret && ptr)
935 strbuf_addstr(buf, ptr);
936 return ret;
937 }
938
939 /*
940 * Check for and extract a content-type parameter. "raw"
941 * should be positioned at the start of the potential
942 * parameter, with any whitespace already removed.
943 *
944 * "name" is the name of the parameter. The value is appended
945 * to "out".
946 */
947 static int extract_param(const char *raw, const char *name,
948 struct strbuf *out)
949 {
950 size_t len = strlen(name);
951
952 if (strncasecmp(raw, name, len))
953 return -1;
954 raw += len;
955
956 if (*raw != '=')
957 return -1;
958 raw++;
959
960 while (*raw && !isspace(*raw) && *raw != ';')
961 strbuf_addch(out, *raw++);
962 return 0;
963 }
964
965 /*
966 * Extract a normalized version of the content type, with any
967 * spaces suppressed, all letters lowercased, and no trailing ";"
968 * or parameters.
969 *
970 * Note that we will silently remove even invalid whitespace. For
971 * example, "text / plain" is specifically forbidden by RFC 2616,
972 * but "text/plain" is the only reasonable output, and this keeps
973 * our code simple.
974 *
975 * If the "charset" argument is not NULL, store the value of any
976 * charset parameter there.
977 *
978 * Example:
979 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
980 * "text / plain" -> "text/plain"
981 */
982 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
983 struct strbuf *charset)
984 {
985 const char *p;
986
987 strbuf_reset(type);
988 strbuf_grow(type, raw->len);
989 for (p = raw->buf; *p; p++) {
990 if (isspace(*p))
991 continue;
992 if (*p == ';') {
993 p++;
994 break;
995 }
996 strbuf_addch(type, tolower(*p));
997 }
998
999 if (!charset)
1000 return;
1001
1002 strbuf_reset(charset);
1003 while (*p) {
1004 while (isspace(*p) || *p == ';')
1005 p++;
1006 if (!extract_param(p, "charset", charset))
1007 return;
1008 while (*p && !isspace(*p))
1009 p++;
1010 }
1011
1012 if (!charset->len && starts_with(type->buf, "text/"))
1013 strbuf_addstr(charset, "ISO-8859-1");
1014 }
1015
1016 static void write_accept_language(struct strbuf *buf)
1017 {
1018 /*
1019 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1020 * that, q-value will be smaller than 0.001, the minimum q-value the
1021 * HTTP specification allows. See
1022 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1023 */
1024 const int MAX_DECIMAL_PLACES = 3;
1025 const int MAX_LANGUAGE_TAGS = 1000;
1026 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1027 char **language_tags = NULL;
1028 int num_langs = 0;
1029 const char *s = get_preferred_languages();
1030 int i;
1031 struct strbuf tag = STRBUF_INIT;
1032
1033 /* Don't add Accept-Language header if no language is preferred. */
1034 if (!s)
1035 return;
1036
1037 /*
1038 * Split the colon-separated string of preferred languages into
1039 * language_tags array.
1040 */
1041 do {
1042 /* collect language tag */
1043 for (; *s && (isalnum(*s) || *s == '_'); s++)
1044 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1045
1046 /* skip .codeset, @modifier and any other unnecessary parts */
1047 while (*s && *s != ':')
1048 s++;
1049
1050 if (tag.len) {
1051 num_langs++;
1052 REALLOC_ARRAY(language_tags, num_langs);
1053 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1054 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1055 break;
1056 }
1057 } while (*s++);
1058
1059 /* write Accept-Language header into buf */
1060 if (num_langs) {
1061 int last_buf_len = 0;
1062 int max_q;
1063 int decimal_places;
1064 char q_format[32];
1065
1066 /* add '*' */
1067 REALLOC_ARRAY(language_tags, num_langs + 1);
1068 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1069
1070 /* compute decimal_places */
1071 for (max_q = 1, decimal_places = 0;
1072 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1073 decimal_places++, max_q *= 10)
1074 ;
1075
1076 sprintf(q_format, ";q=0.%%0%dd", decimal_places);
1077
1078 strbuf_addstr(buf, "Accept-Language: ");
1079
1080 for (i = 0; i < num_langs; i++) {
1081 if (i > 0)
1082 strbuf_addstr(buf, ", ");
1083
1084 strbuf_addstr(buf, language_tags[i]);
1085
1086 if (i > 0)
1087 strbuf_addf(buf, q_format, max_q - i);
1088
1089 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1090 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1091 break;
1092 }
1093
1094 last_buf_len = buf->len;
1095 }
1096 }
1097
1098 /* free language tags -- last one is a static '*' */
1099 for (i = 0; i < num_langs - 1; i++)
1100 free(language_tags[i]);
1101 free(language_tags);
1102 }
1103
1104 /*
1105 * Get an Accept-Language header which indicates user's preferred languages.
1106 *
1107 * Examples:
1108 * LANGUAGE= -> ""
1109 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1110 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1111 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1112 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1113 * LANGUAGE= LANG=C -> ""
1114 */
1115 static const char *get_accept_language(void)
1116 {
1117 if (!cached_accept_language) {
1118 struct strbuf buf = STRBUF_INIT;
1119 write_accept_language(&buf);
1120 if (buf.len > 0)
1121 cached_accept_language = strbuf_detach(&buf, NULL);
1122 }
1123
1124 return cached_accept_language;
1125 }
1126
1127 /* http_request() targets */
1128 #define HTTP_REQUEST_STRBUF 0
1129 #define HTTP_REQUEST_FILE 1
1130
1131 static int http_request(const char *url,
1132 void *result, int target,
1133 const struct http_get_options *options)
1134 {
1135 struct active_request_slot *slot;
1136 struct slot_results results;
1137 struct curl_slist *headers = NULL;
1138 struct strbuf buf = STRBUF_INIT;
1139 const char *accept_language;
1140 int ret;
1141
1142 slot = get_active_slot();
1143 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1144
1145 if (result == NULL) {
1146 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1147 } else {
1148 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1149 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1150
1151 if (target == HTTP_REQUEST_FILE) {
1152 long posn = ftell(result);
1153 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1154 fwrite);
1155 if (posn > 0) {
1156 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1157 headers = curl_slist_append(headers, buf.buf);
1158 strbuf_reset(&buf);
1159 }
1160 } else
1161 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1162 fwrite_buffer);
1163 }
1164
1165 accept_language = get_accept_language();
1166
1167 if (accept_language)
1168 headers = curl_slist_append(headers, accept_language);
1169
1170 strbuf_addstr(&buf, "Pragma:");
1171 if (options && options->no_cache)
1172 strbuf_addstr(&buf, " no-cache");
1173 if (options && options->keep_error)
1174 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1175
1176 headers = curl_slist_append(headers, buf.buf);
1177
1178 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1179 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1180 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1181
1182 ret = run_one_slot(slot, &results);
1183
1184 if (options && options->content_type) {
1185 struct strbuf raw = STRBUF_INIT;
1186 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1187 extract_content_type(&raw, options->content_type,
1188 options->charset);
1189 strbuf_release(&raw);
1190 }
1191
1192 if (options && options->effective_url)
1193 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1194 options->effective_url);
1195
1196 curl_slist_free_all(headers);
1197 strbuf_release(&buf);
1198
1199 return ret;
1200 }
1201
1202 /*
1203 * Update the "base" url to a more appropriate value, as deduced by
1204 * redirects seen when requesting a URL starting with "url".
1205 *
1206 * The "asked" parameter is a URL that we asked curl to access, and must begin
1207 * with "base".
1208 *
1209 * The "got" parameter is the URL that curl reported to us as where we ended
1210 * up.
1211 *
1212 * Returns 1 if we updated the base url, 0 otherwise.
1213 *
1214 * Our basic strategy is to compare "base" and "asked" to find the bits
1215 * specific to our request. We then strip those bits off of "got" to yield the
1216 * new base. So for example, if our base is "http://example.com/foo.git",
1217 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1218 * with "https://other.example.com/foo.git/info/refs". We would want the
1219 * new URL to become "https://other.example.com/foo.git".
1220 *
1221 * Note that this assumes a sane redirect scheme. It's entirely possible
1222 * in the example above to end up at a URL that does not even end in
1223 * "info/refs". In such a case we simply punt, as there is not much we can
1224 * do (and such a scheme is unlikely to represent a real git repository,
1225 * which means we are likely about to abort anyway).
1226 */
1227 static int update_url_from_redirect(struct strbuf *base,
1228 const char *asked,
1229 const struct strbuf *got)
1230 {
1231 const char *tail;
1232 size_t tail_len;
1233
1234 if (!strcmp(asked, got->buf))
1235 return 0;
1236
1237 if (!skip_prefix(asked, base->buf, &tail))
1238 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1239 asked, base->buf);
1240
1241 tail_len = strlen(tail);
1242
1243 if (got->len < tail_len ||
1244 strcmp(tail, got->buf + got->len - tail_len))
1245 return 0; /* insane redirect scheme */
1246
1247 strbuf_reset(base);
1248 strbuf_add(base, got->buf, got->len - tail_len);
1249 return 1;
1250 }
1251
1252 static int http_request_reauth(const char *url,
1253 void *result, int target,
1254 struct http_get_options *options)
1255 {
1256 int ret = http_request(url, result, target, options);
1257
1258 if (options && options->effective_url && options->base_url) {
1259 if (update_url_from_redirect(options->base_url,
1260 url, options->effective_url)) {
1261 credential_from_url(&http_auth, options->base_url->buf);
1262 url = options->effective_url->buf;
1263 }
1264 }
1265
1266 if (ret != HTTP_REAUTH)
1267 return ret;
1268
1269 /*
1270 * If we are using KEEP_ERROR, the previous request may have
1271 * put cruft into our output stream; we should clear it out before
1272 * making our next request. We only know how to do this for
1273 * the strbuf case, but that is enough to satisfy current callers.
1274 */
1275 if (options && options->keep_error) {
1276 switch (target) {
1277 case HTTP_REQUEST_STRBUF:
1278 strbuf_reset(result);
1279 break;
1280 default:
1281 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1282 }
1283 }
1284
1285 credential_fill(&http_auth);
1286
1287 return http_request(url, result, target, options);
1288 }
1289
1290 int http_get_strbuf(const char *url,
1291 struct strbuf *result,
1292 struct http_get_options *options)
1293 {
1294 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1295 }
1296
1297 /*
1298 * Downloads a URL and stores the result in the given file.
1299 *
1300 * If a previous interrupted download is detected (i.e. a previous temporary
1301 * file is still around) the download is resumed.
1302 */
1303 static int http_get_file(const char *url, const char *filename,
1304 struct http_get_options *options)
1305 {
1306 int ret;
1307 struct strbuf tmpfile = STRBUF_INIT;
1308 FILE *result;
1309
1310 strbuf_addf(&tmpfile, "%s.temp", filename);
1311 result = fopen(tmpfile.buf, "a");
1312 if (!result) {
1313 error("Unable to open local file %s", tmpfile.buf);
1314 ret = HTTP_ERROR;
1315 goto cleanup;
1316 }
1317
1318 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1319 fclose(result);
1320
1321 if (ret == HTTP_OK && move_temp_to_file(tmpfile.buf, filename))
1322 ret = HTTP_ERROR;
1323 cleanup:
1324 strbuf_release(&tmpfile);
1325 return ret;
1326 }
1327
1328 int http_fetch_ref(const char *base, struct ref *ref)
1329 {
1330 struct http_get_options options = {0};
1331 char *url;
1332 struct strbuf buffer = STRBUF_INIT;
1333 int ret = -1;
1334
1335 options.no_cache = 1;
1336
1337 url = quote_ref_url(base, ref->name);
1338 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1339 strbuf_rtrim(&buffer);
1340 if (buffer.len == 40)
1341 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1342 else if (starts_with(buffer.buf, "ref: ")) {
1343 ref->symref = xstrdup(buffer.buf + 5);
1344 ret = 0;
1345 }
1346 }
1347
1348 strbuf_release(&buffer);
1349 free(url);
1350 return ret;
1351 }
1352
1353 /* Helpers for fetching packs */
1354 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1355 {
1356 char *url, *tmp;
1357 struct strbuf buf = STRBUF_INIT;
1358
1359 if (http_is_verbose)
1360 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1361
1362 end_url_with_slash(&buf, base_url);
1363 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1364 url = strbuf_detach(&buf, NULL);
1365
1366 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1367 tmp = strbuf_detach(&buf, NULL);
1368
1369 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1370 error("Unable to get pack index %s", url);
1371 free(tmp);
1372 tmp = NULL;
1373 }
1374
1375 free(url);
1376 return tmp;
1377 }
1378
1379 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1380 unsigned char *sha1, const char *base_url)
1381 {
1382 struct packed_git *new_pack;
1383 char *tmp_idx = NULL;
1384 int ret;
1385
1386 if (has_pack_index(sha1)) {
1387 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1388 if (!new_pack)
1389 return -1; /* parse_pack_index() already issued error message */
1390 goto add_pack;
1391 }
1392
1393 tmp_idx = fetch_pack_index(sha1, base_url);
1394 if (!tmp_idx)
1395 return -1;
1396
1397 new_pack = parse_pack_index(sha1, tmp_idx);
1398 if (!new_pack) {
1399 unlink(tmp_idx);
1400 free(tmp_idx);
1401
1402 return -1; /* parse_pack_index() already issued error message */
1403 }
1404
1405 ret = verify_pack_index(new_pack);
1406 if (!ret) {
1407 close_pack_index(new_pack);
1408 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1409 }
1410 free(tmp_idx);
1411 if (ret)
1412 return -1;
1413
1414 add_pack:
1415 new_pack->next = *packs_head;
1416 *packs_head = new_pack;
1417 return 0;
1418 }
1419
1420 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1421 {
1422 struct http_get_options options = {0};
1423 int ret = 0, i = 0;
1424 char *url, *data;
1425 struct strbuf buf = STRBUF_INIT;
1426 unsigned char sha1[20];
1427
1428 end_url_with_slash(&buf, base_url);
1429 strbuf_addstr(&buf, "objects/info/packs");
1430 url = strbuf_detach(&buf, NULL);
1431
1432 options.no_cache = 1;
1433 ret = http_get_strbuf(url, &buf, &options);
1434 if (ret != HTTP_OK)
1435 goto cleanup;
1436
1437 data = buf.buf;
1438 while (i < buf.len) {
1439 switch (data[i]) {
1440 case 'P':
1441 i++;
1442 if (i + 52 <= buf.len &&
1443 starts_with(data + i, " pack-") &&
1444 starts_with(data + i + 46, ".pack\n")) {
1445 get_sha1_hex(data + i + 6, sha1);
1446 fetch_and_setup_pack_index(packs_head, sha1,
1447 base_url);
1448 i += 51;
1449 break;
1450 }
1451 default:
1452 while (i < buf.len && data[i] != '\n')
1453 i++;
1454 }
1455 i++;
1456 }
1457
1458 cleanup:
1459 free(url);
1460 return ret;
1461 }
1462
1463 void release_http_pack_request(struct http_pack_request *preq)
1464 {
1465 if (preq->packfile != NULL) {
1466 fclose(preq->packfile);
1467 preq->packfile = NULL;
1468 }
1469 if (preq->range_header != NULL) {
1470 curl_slist_free_all(preq->range_header);
1471 preq->range_header = NULL;
1472 }
1473 preq->slot = NULL;
1474 free(preq->url);
1475 free(preq);
1476 }
1477
1478 int finish_http_pack_request(struct http_pack_request *preq)
1479 {
1480 struct packed_git **lst;
1481 struct packed_git *p = preq->target;
1482 char *tmp_idx;
1483 struct child_process ip = CHILD_PROCESS_INIT;
1484 const char *ip_argv[8];
1485
1486 close_pack_index(p);
1487
1488 fclose(preq->packfile);
1489 preq->packfile = NULL;
1490
1491 lst = preq->lst;
1492 while (*lst != p)
1493 lst = &((*lst)->next);
1494 *lst = (*lst)->next;
1495
1496 tmp_idx = xstrdup(preq->tmpfile);
1497 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1498 ".idx.temp");
1499
1500 ip_argv[0] = "index-pack";
1501 ip_argv[1] = "-o";
1502 ip_argv[2] = tmp_idx;
1503 ip_argv[3] = preq->tmpfile;
1504 ip_argv[4] = NULL;
1505
1506 ip.argv = ip_argv;
1507 ip.git_cmd = 1;
1508 ip.no_stdin = 1;
1509 ip.no_stdout = 1;
1510
1511 if (run_command(&ip)) {
1512 unlink(preq->tmpfile);
1513 unlink(tmp_idx);
1514 free(tmp_idx);
1515 return -1;
1516 }
1517
1518 unlink(sha1_pack_index_name(p->sha1));
1519
1520 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1521 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1522 free(tmp_idx);
1523 return -1;
1524 }
1525
1526 install_packed_git(p);
1527 free(tmp_idx);
1528 return 0;
1529 }
1530
1531 struct http_pack_request *new_http_pack_request(
1532 struct packed_git *target, const char *base_url)
1533 {
1534 long prev_posn = 0;
1535 char range[RANGE_HEADER_SIZE];
1536 struct strbuf buf = STRBUF_INIT;
1537 struct http_pack_request *preq;
1538
1539 preq = xcalloc(1, sizeof(*preq));
1540 preq->target = target;
1541
1542 end_url_with_slash(&buf, base_url);
1543 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1544 sha1_to_hex(target->sha1));
1545 preq->url = strbuf_detach(&buf, NULL);
1546
1547 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1548 sha1_pack_name(target->sha1));
1549 preq->packfile = fopen(preq->tmpfile, "a");
1550 if (!preq->packfile) {
1551 error("Unable to open local file %s for pack",
1552 preq->tmpfile);
1553 goto abort;
1554 }
1555
1556 preq->slot = get_active_slot();
1557 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1558 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1559 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1560 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1561 no_pragma_header);
1562
1563 /*
1564 * If there is data present from a previous transfer attempt,
1565 * resume where it left off
1566 */
1567 prev_posn = ftell(preq->packfile);
1568 if (prev_posn>0) {
1569 if (http_is_verbose)
1570 fprintf(stderr,
1571 "Resuming fetch of pack %s at byte %ld\n",
1572 sha1_to_hex(target->sha1), prev_posn);
1573 sprintf(range, "Range: bytes=%ld-", prev_posn);
1574 preq->range_header = curl_slist_append(NULL, range);
1575 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1576 preq->range_header);
1577 }
1578
1579 return preq;
1580
1581 abort:
1582 free(preq->url);
1583 free(preq);
1584 return NULL;
1585 }
1586
1587 /* Helpers for fetching objects (loose) */
1588 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1589 void *data)
1590 {
1591 unsigned char expn[4096];
1592 size_t size = eltsize * nmemb;
1593 int posn = 0;
1594 struct http_object_request *freq =
1595 (struct http_object_request *)data;
1596 do {
1597 ssize_t retval = xwrite(freq->localfile,
1598 (char *) ptr + posn, size - posn);
1599 if (retval < 0)
1600 return posn;
1601 posn += retval;
1602 } while (posn < size);
1603
1604 freq->stream.avail_in = size;
1605 freq->stream.next_in = (void *)ptr;
1606 do {
1607 freq->stream.next_out = expn;
1608 freq->stream.avail_out = sizeof(expn);
1609 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1610 git_SHA1_Update(&freq->c, expn,
1611 sizeof(expn) - freq->stream.avail_out);
1612 } while (freq->stream.avail_in && freq->zret == Z_OK);
1613 return size;
1614 }
1615
1616 struct http_object_request *new_http_object_request(const char *base_url,
1617 unsigned char *sha1)
1618 {
1619 char *hex = sha1_to_hex(sha1);
1620 const char *filename;
1621 char prevfile[PATH_MAX];
1622 int prevlocal;
1623 char prev_buf[PREV_BUF_SIZE];
1624 ssize_t prev_read = 0;
1625 long prev_posn = 0;
1626 char range[RANGE_HEADER_SIZE];
1627 struct curl_slist *range_header = NULL;
1628 struct http_object_request *freq;
1629
1630 freq = xcalloc(1, sizeof(*freq));
1631 hashcpy(freq->sha1, sha1);
1632 freq->localfile = -1;
1633
1634 filename = sha1_file_name(sha1);
1635 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1636 "%s.temp", filename);
1637
1638 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1639 unlink_or_warn(prevfile);
1640 rename(freq->tmpfile, prevfile);
1641 unlink_or_warn(freq->tmpfile);
1642
1643 if (freq->localfile != -1)
1644 error("fd leakage in start: %d", freq->localfile);
1645 freq->localfile = open(freq->tmpfile,
1646 O_WRONLY | O_CREAT | O_EXCL, 0666);
1647 /*
1648 * This could have failed due to the "lazy directory creation";
1649 * try to mkdir the last path component.
1650 */
1651 if (freq->localfile < 0 && errno == ENOENT) {
1652 char *dir = strrchr(freq->tmpfile, '/');
1653 if (dir) {
1654 *dir = 0;
1655 mkdir(freq->tmpfile, 0777);
1656 *dir = '/';
1657 }
1658 freq->localfile = open(freq->tmpfile,
1659 O_WRONLY | O_CREAT | O_EXCL, 0666);
1660 }
1661
1662 if (freq->localfile < 0) {
1663 error("Couldn't create temporary file %s: %s",
1664 freq->tmpfile, strerror(errno));
1665 goto abort;
1666 }
1667
1668 git_inflate_init(&freq->stream);
1669
1670 git_SHA1_Init(&freq->c);
1671
1672 freq->url = get_remote_object_url(base_url, hex, 0);
1673
1674 /*
1675 * If a previous temp file is present, process what was already
1676 * fetched.
1677 */
1678 prevlocal = open(prevfile, O_RDONLY);
1679 if (prevlocal != -1) {
1680 do {
1681 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1682 if (prev_read>0) {
1683 if (fwrite_sha1_file(prev_buf,
1684 1,
1685 prev_read,
1686 freq) == prev_read) {
1687 prev_posn += prev_read;
1688 } else {
1689 prev_read = -1;
1690 }
1691 }
1692 } while (prev_read > 0);
1693 close(prevlocal);
1694 }
1695 unlink_or_warn(prevfile);
1696
1697 /*
1698 * Reset inflate/SHA1 if there was an error reading the previous temp
1699 * file; also rewind to the beginning of the local file.
1700 */
1701 if (prev_read == -1) {
1702 memset(&freq->stream, 0, sizeof(freq->stream));
1703 git_inflate_init(&freq->stream);
1704 git_SHA1_Init(&freq->c);
1705 if (prev_posn>0) {
1706 prev_posn = 0;
1707 lseek(freq->localfile, 0, SEEK_SET);
1708 if (ftruncate(freq->localfile, 0) < 0) {
1709 error("Couldn't truncate temporary file %s: %s",
1710 freq->tmpfile, strerror(errno));
1711 goto abort;
1712 }
1713 }
1714 }
1715
1716 freq->slot = get_active_slot();
1717
1718 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1719 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1720 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1721 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1722 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1723
1724 /*
1725 * If we have successfully processed data from a previous fetch
1726 * attempt, only fetch the data we don't already have.
1727 */
1728 if (prev_posn>0) {
1729 if (http_is_verbose)
1730 fprintf(stderr,
1731 "Resuming fetch of object %s at byte %ld\n",
1732 hex, prev_posn);
1733 sprintf(range, "Range: bytes=%ld-", prev_posn);
1734 range_header = curl_slist_append(range_header, range);
1735 curl_easy_setopt(freq->slot->curl,
1736 CURLOPT_HTTPHEADER, range_header);
1737 }
1738
1739 return freq;
1740
1741 abort:
1742 free(freq->url);
1743 free(freq);
1744 return NULL;
1745 }
1746
1747 void process_http_object_request(struct http_object_request *freq)
1748 {
1749 if (freq->slot == NULL)
1750 return;
1751 freq->curl_result = freq->slot->curl_result;
1752 freq->http_code = freq->slot->http_code;
1753 freq->slot = NULL;
1754 }
1755
1756 int finish_http_object_request(struct http_object_request *freq)
1757 {
1758 struct stat st;
1759
1760 close(freq->localfile);
1761 freq->localfile = -1;
1762
1763 process_http_object_request(freq);
1764
1765 if (freq->http_code == 416) {
1766 warning("requested range invalid; we may already have all the data.");
1767 } else if (freq->curl_result != CURLE_OK) {
1768 if (stat(freq->tmpfile, &st) == 0)
1769 if (st.st_size == 0)
1770 unlink_or_warn(freq->tmpfile);
1771 return -1;
1772 }
1773
1774 git_inflate_end(&freq->stream);
1775 git_SHA1_Final(freq->real_sha1, &freq->c);
1776 if (freq->zret != Z_STREAM_END) {
1777 unlink_or_warn(freq->tmpfile);
1778 return -1;
1779 }
1780 if (hashcmp(freq->sha1, freq->real_sha1)) {
1781 unlink_or_warn(freq->tmpfile);
1782 return -1;
1783 }
1784 freq->rename =
1785 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1786
1787 return freq->rename;
1788 }
1789
1790 void abort_http_object_request(struct http_object_request *freq)
1791 {
1792 unlink_or_warn(freq->tmpfile);
1793
1794 release_http_object_request(freq);
1795 }
1796
1797 void release_http_object_request(struct http_object_request *freq)
1798 {
1799 if (freq->localfile != -1) {
1800 close(freq->localfile);
1801 freq->localfile = -1;
1802 }
1803 if (freq->url != NULL) {
1804 free(freq->url);
1805 freq->url = NULL;
1806 }
1807 if (freq->slot != NULL) {
1808 freq->slot->callback_func = NULL;
1809 freq->slot->callback_data = NULL;
1810 release_active_slot(freq->slot);
1811 freq->slot = NULL;
1812 }
1813 }
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