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Ninth batch for 2.6
[alt-git.git] / http.c
blob9dce38025c7b35f7f5ad19121c0529b442aec92d
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 static const char *ssl_version;
41 static struct {
42 const char *name;
43 long ssl_version;
44 } sslversions[] = {
45 { "sslv2", CURL_SSLVERSION_SSLv2 },
46 { "sslv3", CURL_SSLVERSION_SSLv3 },
47 { "tlsv1", CURL_SSLVERSION_TLSv1 },
48 #if LIBCURL_VERSION_NUM >= 0x072200
49 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
50 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
51 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
52 #endif
53 };
54 #if LIBCURL_VERSION_NUM >= 0x070903
55 static const char *ssl_key;
56 #endif
57 #if LIBCURL_VERSION_NUM >= 0x070908
58 static const char *ssl_capath;
59 #endif
60 static const char *ssl_cainfo;
61 static long curl_low_speed_limit = -1;
62 static long curl_low_speed_time = -1;
63 static int curl_ftp_no_epsv;
64 static const char *curl_http_proxy;
65 static const char *curl_cookie_file;
66 static int curl_save_cookies;
67 struct credential http_auth = CREDENTIAL_INIT;
68 static int http_proactive_auth;
69 static const char *user_agent;
70
71 #if LIBCURL_VERSION_NUM >= 0x071700
72 /* Use CURLOPT_KEYPASSWD as is */
73 #elif LIBCURL_VERSION_NUM >= 0x070903
74 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
75 #else
76 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
77 #endif
78
79 static struct credential cert_auth = CREDENTIAL_INIT;
80 static int ssl_cert_password_required;
81 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
82 static unsigned long http_auth_methods = CURLAUTH_ANY;
83 #endif
84
85 static struct curl_slist *pragma_header;
86 static struct curl_slist *no_pragma_header;
87
88 static struct active_request_slot *active_queue_head;
89
90 static char *cached_accept_language;
91
92 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
93 {
94 size_t size = eltsize * nmemb;
95 struct buffer *buffer = buffer_;
96
97 if (size > buffer->buf.len - buffer->posn)
98 size = buffer->buf.len - buffer->posn;
99 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
100 buffer->posn += size;
101
102 return size;
103 }
104
105 #ifndef NO_CURL_IOCTL
106 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
107 {
108 struct buffer *buffer = clientp;
109
110 switch (cmd) {
111 case CURLIOCMD_NOP:
112 return CURLIOE_OK;
113
114 case CURLIOCMD_RESTARTREAD:
115 buffer->posn = 0;
116 return CURLIOE_OK;
117
118 default:
119 return CURLIOE_UNKNOWNCMD;
120 }
121 }
122 #endif
123
124 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
125 {
126 size_t size = eltsize * nmemb;
127 struct strbuf *buffer = buffer_;
128
129 strbuf_add(buffer, ptr, size);
130 return size;
131 }
132
133 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
134 {
135 return eltsize * nmemb;
136 }
137
138 static void closedown_active_slot(struct active_request_slot *slot)
139 {
140 active_requests--;
141 slot->in_use = 0;
142 }
143
144 static void finish_active_slot(struct active_request_slot *slot)
145 {
146 closedown_active_slot(slot);
147 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
148
149 if (slot->finished != NULL)
150 (*slot->finished) = 1;
151
152 /* Store slot results so they can be read after the slot is reused */
153 if (slot->results != NULL) {
154 slot->results->curl_result = slot->curl_result;
155 slot->results->http_code = slot->http_code;
156 #if LIBCURL_VERSION_NUM >= 0x070a08
157 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
158 &slot->results->auth_avail);
159 #else
160 slot->results->auth_avail = 0;
161 #endif
162 }
163
164 /* Run callback if appropriate */
165 if (slot->callback_func != NULL)
166 slot->callback_func(slot->callback_data);
167 }
168
169 #ifdef USE_CURL_MULTI
170 static void process_curl_messages(void)
171 {
172 int num_messages;
173 struct active_request_slot *slot;
174 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
175
176 while (curl_message != NULL) {
177 if (curl_message->msg == CURLMSG_DONE) {
178 int curl_result = curl_message->data.result;
179 slot = active_queue_head;
180 while (slot != NULL &&
181 slot->curl != curl_message->easy_handle)
182 slot = slot->next;
183 if (slot != NULL) {
184 curl_multi_remove_handle(curlm, slot->curl);
185 slot->curl_result = curl_result;
186 finish_active_slot(slot);
187 } else {
188 fprintf(stderr, "Received DONE message for unknown request!\n");
189 }
190 } else {
191 fprintf(stderr, "Unknown CURL message received: %d\n",
192 (int)curl_message->msg);
193 }
194 curl_message = curl_multi_info_read(curlm, &num_messages);
195 }
196 }
197 #endif
198
199 static int http_options(const char *var, const char *value, void *cb)
200 {
201 if (!strcmp("http.sslverify", var)) {
202 curl_ssl_verify = git_config_bool(var, value);
203 return 0;
204 }
205 if (!strcmp("http.sslcipherlist", var))
206 return git_config_string(&ssl_cipherlist, var, value);
207 if (!strcmp("http.sslversion", var))
208 return git_config_string(&ssl_version, var, value);
209 if (!strcmp("http.sslcert", var))
210 return git_config_string(&ssl_cert, var, value);
211 #if LIBCURL_VERSION_NUM >= 0x070903
212 if (!strcmp("http.sslkey", var))
213 return git_config_string(&ssl_key, var, value);
214 #endif
215 #if LIBCURL_VERSION_NUM >= 0x070908
216 if (!strcmp("http.sslcapath", var))
217 return git_config_string(&ssl_capath, var, value);
218 #endif
219 if (!strcmp("http.sslcainfo", var))
220 return git_config_string(&ssl_cainfo, var, value);
221 if (!strcmp("http.sslcertpasswordprotected", var)) {
222 ssl_cert_password_required = git_config_bool(var, value);
223 return 0;
224 }
225 if (!strcmp("http.ssltry", var)) {
226 curl_ssl_try = git_config_bool(var, value);
227 return 0;
228 }
229 if (!strcmp("http.minsessions", var)) {
230 min_curl_sessions = git_config_int(var, value);
231 #ifndef USE_CURL_MULTI
232 if (min_curl_sessions > 1)
233 min_curl_sessions = 1;
234 #endif
235 return 0;
236 }
237 #ifdef USE_CURL_MULTI
238 if (!strcmp("http.maxrequests", var)) {
239 max_requests = git_config_int(var, value);
240 return 0;
241 }
242 #endif
243 if (!strcmp("http.lowspeedlimit", var)) {
244 curl_low_speed_limit = (long)git_config_int(var, value);
245 return 0;
246 }
247 if (!strcmp("http.lowspeedtime", var)) {
248 curl_low_speed_time = (long)git_config_int(var, value);
249 return 0;
250 }
251
252 if (!strcmp("http.noepsv", var)) {
253 curl_ftp_no_epsv = git_config_bool(var, value);
254 return 0;
255 }
256 if (!strcmp("http.proxy", var))
257 return git_config_string(&curl_http_proxy, var, value);
258
259 if (!strcmp("http.cookiefile", var))
260 return git_config_string(&curl_cookie_file, var, value);
261 if (!strcmp("http.savecookies", var)) {
262 curl_save_cookies = git_config_bool(var, value);
263 return 0;
264 }
265
266 if (!strcmp("http.postbuffer", var)) {
267 http_post_buffer = git_config_int(var, value);
268 if (http_post_buffer < LARGE_PACKET_MAX)
269 http_post_buffer = LARGE_PACKET_MAX;
270 return 0;
271 }
272
273 if (!strcmp("http.useragent", var))
274 return git_config_string(&user_agent, var, value);
275
276 /* Fall back on the default ones */
277 return git_default_config(var, value, cb);
278 }
279
280 static void init_curl_http_auth(CURL *result)
281 {
282 if (!http_auth.username)
283 return;
284
285 credential_fill(&http_auth);
286
287 #if LIBCURL_VERSION_NUM >= 0x071301
288 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
289 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
290 #else
291 {
292 static struct strbuf up = STRBUF_INIT;
293 /*
294 * Note that we assume we only ever have a single set of
295 * credentials in a given program run, so we do not have
296 * to worry about updating this buffer, only setting its
297 * initial value.
298 */
299 if (!up.len)
300 strbuf_addf(&up, "%s:%s",
301 http_auth.username, http_auth.password);
302 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
303 }
304 #endif
305 }
306
307 static int has_cert_password(void)
308 {
309 if (ssl_cert == NULL || ssl_cert_password_required != 1)
310 return 0;
311 if (!cert_auth.password) {
312 cert_auth.protocol = xstrdup("cert");
313 cert_auth.username = xstrdup("");
314 cert_auth.path = xstrdup(ssl_cert);
315 credential_fill(&cert_auth);
316 }
317 return 1;
318 }
319
320 #if LIBCURL_VERSION_NUM >= 0x071900
321 static void set_curl_keepalive(CURL *c)
322 {
323 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
324 }
325
326 #elif LIBCURL_VERSION_NUM >= 0x071000
327 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
328 {
329 int ka = 1;
330 int rc;
331 socklen_t len = (socklen_t)sizeof(ka);
332
333 if (type != CURLSOCKTYPE_IPCXN)
334 return 0;
335
336 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
337 if (rc < 0)
338 warning("unable to set SO_KEEPALIVE on socket %s",
339 strerror(errno));
340
341 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
342 }
343
344 static void set_curl_keepalive(CURL *c)
345 {
346 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
347 }
348
349 #else
350 static void set_curl_keepalive(CURL *c)
351 {
352 /* not supported on older curl versions */
353 }
354 #endif
355
356 static CURL *get_curl_handle(void)
357 {
358 CURL *result = curl_easy_init();
359
360 if (!result)
361 die("curl_easy_init failed");
362
363 if (!curl_ssl_verify) {
364 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
365 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
366 } else {
367 /* Verify authenticity of the peer's certificate */
368 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
369 /* The name in the cert must match whom we tried to connect */
370 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
371 }
372
373 #if LIBCURL_VERSION_NUM >= 0x070907
374 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
375 #endif
376 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
377 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
378 #endif
379
380 if (http_proactive_auth)
381 init_curl_http_auth(result);
382
383 if (getenv("GIT_SSL_VERSION"))
384 ssl_version = getenv("GIT_SSL_VERSION");
385 if (ssl_version && *ssl_version) {
386 int i;
387 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
388 if (!strcmp(ssl_version, sslversions[i].name)) {
389 curl_easy_setopt(result, CURLOPT_SSLVERSION,
390 sslversions[i].ssl_version);
391 break;
392 }
393 }
394 if (i == ARRAY_SIZE(sslversions))
395 warning("unsupported ssl version %s: using default",
396 ssl_version);
397 }
398
399 if (getenv("GIT_SSL_CIPHER_LIST"))
400 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
401 if (ssl_cipherlist != NULL && *ssl_cipherlist)
402 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
403 ssl_cipherlist);
404
405 if (ssl_cert != NULL)
406 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
407 if (has_cert_password())
408 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
409 #if LIBCURL_VERSION_NUM >= 0x070903
410 if (ssl_key != NULL)
411 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
412 #endif
413 #if LIBCURL_VERSION_NUM >= 0x070908
414 if (ssl_capath != NULL)
415 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
416 #endif
417 if (ssl_cainfo != NULL)
418 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
419
420 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
421 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
422 curl_low_speed_limit);
423 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
424 curl_low_speed_time);
425 }
426
427 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
428 #if LIBCURL_VERSION_NUM >= 0x071301
429 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
430 #elif LIBCURL_VERSION_NUM >= 0x071101
431 curl_easy_setopt(result, CURLOPT_POST301, 1);
432 #endif
433
434 if (getenv("GIT_CURL_VERBOSE"))
435 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
436
437 curl_easy_setopt(result, CURLOPT_USERAGENT,
438 user_agent ? user_agent : git_user_agent());
439
440 if (curl_ftp_no_epsv)
441 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
442
443 #ifdef CURLOPT_USE_SSL
444 if (curl_ssl_try)
445 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
446 #endif
447
448 if (curl_http_proxy) {
449 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
450 }
451 #if LIBCURL_VERSION_NUM >= 0x070a07
452 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
453 #endif
454
455 set_curl_keepalive(result);
456
457 return result;
458 }
459
460 static void set_from_env(const char **var, const char *envname)
461 {
462 const char *val = getenv(envname);
463 if (val)
464 *var = val;
465 }
466
467 void http_init(struct remote *remote, const char *url, int proactive_auth)
468 {
469 char *low_speed_limit;
470 char *low_speed_time;
471 char *normalized_url;
472 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
473
474 config.section = "http";
475 config.key = NULL;
476 config.collect_fn = http_options;
477 config.cascade_fn = git_default_config;
478 config.cb = NULL;
479
480 http_is_verbose = 0;
481 normalized_url = url_normalize(url, &config.url);
482
483 git_config(urlmatch_config_entry, &config);
484 free(normalized_url);
485
486 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
487 die("curl_global_init failed");
488
489 http_proactive_auth = proactive_auth;
490
491 if (remote && remote->http_proxy)
492 curl_http_proxy = xstrdup(remote->http_proxy);
493
494 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
495 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
496
497 #ifdef USE_CURL_MULTI
498 {
499 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
500 if (http_max_requests != NULL)
501 max_requests = atoi(http_max_requests);
502 }
503
504 curlm = curl_multi_init();
505 if (!curlm)
506 die("curl_multi_init failed");
507 #endif
508
509 if (getenv("GIT_SSL_NO_VERIFY"))
510 curl_ssl_verify = 0;
511
512 set_from_env(&ssl_cert, "GIT_SSL_CERT");
513 #if LIBCURL_VERSION_NUM >= 0x070903
514 set_from_env(&ssl_key, "GIT_SSL_KEY");
515 #endif
516 #if LIBCURL_VERSION_NUM >= 0x070908
517 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
518 #endif
519 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
520
521 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
522
523 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
524 if (low_speed_limit != NULL)
525 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
526 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
527 if (low_speed_time != NULL)
528 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
529
530 if (curl_ssl_verify == -1)
531 curl_ssl_verify = 1;
532
533 curl_session_count = 0;
534 #ifdef USE_CURL_MULTI
535 if (max_requests < 1)
536 max_requests = DEFAULT_MAX_REQUESTS;
537 #endif
538
539 if (getenv("GIT_CURL_FTP_NO_EPSV"))
540 curl_ftp_no_epsv = 1;
541
542 if (url) {
543 credential_from_url(&http_auth, url);
544 if (!ssl_cert_password_required &&
545 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
546 starts_with(url, "https://"))
547 ssl_cert_password_required = 1;
548 }
549
550 #ifndef NO_CURL_EASY_DUPHANDLE
551 curl_default = get_curl_handle();
552 #endif
553 }
554
555 void http_cleanup(void)
556 {
557 struct active_request_slot *slot = active_queue_head;
558
559 while (slot != NULL) {
560 struct active_request_slot *next = slot->next;
561 if (slot->curl != NULL) {
562 #ifdef USE_CURL_MULTI
563 curl_multi_remove_handle(curlm, slot->curl);
564 #endif
565 curl_easy_cleanup(slot->curl);
566 }
567 free(slot);
568 slot = next;
569 }
570 active_queue_head = NULL;
571
572 #ifndef NO_CURL_EASY_DUPHANDLE
573 curl_easy_cleanup(curl_default);
574 #endif
575
576 #ifdef USE_CURL_MULTI
577 curl_multi_cleanup(curlm);
578 #endif
579 curl_global_cleanup();
580
581 curl_slist_free_all(pragma_header);
582 pragma_header = NULL;
583
584 curl_slist_free_all(no_pragma_header);
585 no_pragma_header = NULL;
586
587 if (curl_http_proxy) {
588 free((void *)curl_http_proxy);
589 curl_http_proxy = NULL;
590 }
591
592 if (cert_auth.password != NULL) {
593 memset(cert_auth.password, 0, strlen(cert_auth.password));
594 free(cert_auth.password);
595 cert_auth.password = NULL;
596 }
597 ssl_cert_password_required = 0;
598
599 free(cached_accept_language);
600 cached_accept_language = NULL;
601 }
602
603 struct active_request_slot *get_active_slot(void)
604 {
605 struct active_request_slot *slot = active_queue_head;
606 struct active_request_slot *newslot;
607
608 #ifdef USE_CURL_MULTI
609 int num_transfers;
610
611 /* Wait for a slot to open up if the queue is full */
612 while (active_requests >= max_requests) {
613 curl_multi_perform(curlm, &num_transfers);
614 if (num_transfers < active_requests)
615 process_curl_messages();
616 }
617 #endif
618
619 while (slot != NULL && slot->in_use)
620 slot = slot->next;
621
622 if (slot == NULL) {
623 newslot = xmalloc(sizeof(*newslot));
624 newslot->curl = NULL;
625 newslot->in_use = 0;
626 newslot->next = NULL;
627
628 slot = active_queue_head;
629 if (slot == NULL) {
630 active_queue_head = newslot;
631 } else {
632 while (slot->next != NULL)
633 slot = slot->next;
634 slot->next = newslot;
635 }
636 slot = newslot;
637 }
638
639 if (slot->curl == NULL) {
640 #ifdef NO_CURL_EASY_DUPHANDLE
641 slot->curl = get_curl_handle();
642 #else
643 slot->curl = curl_easy_duphandle(curl_default);
644 #endif
645 curl_session_count++;
646 }
647
648 active_requests++;
649 slot->in_use = 1;
650 slot->results = NULL;
651 slot->finished = NULL;
652 slot->callback_data = NULL;
653 slot->callback_func = NULL;
654 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
655 if (curl_save_cookies)
656 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
657 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
658 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
659 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
660 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
661 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
662 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
663 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
664 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
665 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
666 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
667 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
668 #endif
669 if (http_auth.password)
670 init_curl_http_auth(slot->curl);
671
672 return slot;
673 }
674
675 int start_active_slot(struct active_request_slot *slot)
676 {
677 #ifdef USE_CURL_MULTI
678 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
679 int num_transfers;
680
681 if (curlm_result != CURLM_OK &&
682 curlm_result != CURLM_CALL_MULTI_PERFORM) {
683 active_requests--;
684 slot->in_use = 0;
685 return 0;
686 }
687
688 /*
689 * We know there must be something to do, since we just added
690 * something.
691 */
692 curl_multi_perform(curlm, &num_transfers);
693 #endif
694 return 1;
695 }
696
697 #ifdef USE_CURL_MULTI
698 struct fill_chain {
699 void *data;
700 int (*fill)(void *);
701 struct fill_chain *next;
702 };
703
704 static struct fill_chain *fill_cfg;
705
706 void add_fill_function(void *data, int (*fill)(void *))
707 {
708 struct fill_chain *new = xmalloc(sizeof(*new));
709 struct fill_chain **linkp = &fill_cfg;
710 new->data = data;
711 new->fill = fill;
712 new->next = NULL;
713 while (*linkp)
714 linkp = &(*linkp)->next;
715 *linkp = new;
716 }
717
718 void fill_active_slots(void)
719 {
720 struct active_request_slot *slot = active_queue_head;
721
722 while (active_requests < max_requests) {
723 struct fill_chain *fill;
724 for (fill = fill_cfg; fill; fill = fill->next)
725 if (fill->fill(fill->data))
726 break;
727
728 if (!fill)
729 break;
730 }
731
732 while (slot != NULL) {
733 if (!slot->in_use && slot->curl != NULL
734 && curl_session_count > min_curl_sessions) {
735 curl_easy_cleanup(slot->curl);
736 slot->curl = NULL;
737 curl_session_count--;
738 }
739 slot = slot->next;
740 }
741 }
742
743 void step_active_slots(void)
744 {
745 int num_transfers;
746 CURLMcode curlm_result;
747
748 do {
749 curlm_result = curl_multi_perform(curlm, &num_transfers);
750 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
751 if (num_transfers < active_requests) {
752 process_curl_messages();
753 fill_active_slots();
754 }
755 }
756 #endif
757
758 void run_active_slot(struct active_request_slot *slot)
759 {
760 #ifdef USE_CURL_MULTI
761 fd_set readfds;
762 fd_set writefds;
763 fd_set excfds;
764 int max_fd;
765 struct timeval select_timeout;
766 int finished = 0;
767
768 slot->finished = &finished;
769 while (!finished) {
770 step_active_slots();
771
772 if (slot->in_use) {
773 #if LIBCURL_VERSION_NUM >= 0x070f04
774 long curl_timeout;
775 curl_multi_timeout(curlm, &curl_timeout);
776 if (curl_timeout == 0) {
777 continue;
778 } else if (curl_timeout == -1) {
779 select_timeout.tv_sec = 0;
780 select_timeout.tv_usec = 50000;
781 } else {
782 select_timeout.tv_sec = curl_timeout / 1000;
783 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
784 }
785 #else
786 select_timeout.tv_sec = 0;
787 select_timeout.tv_usec = 50000;
788 #endif
789
790 max_fd = -1;
791 FD_ZERO(&readfds);
792 FD_ZERO(&writefds);
793 FD_ZERO(&excfds);
794 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
795
796 /*
797 * It can happen that curl_multi_timeout returns a pathologically
798 * long timeout when curl_multi_fdset returns no file descriptors
799 * to read. See commit message for more details.
800 */
801 if (max_fd < 0 &&
802 (select_timeout.tv_sec > 0 ||
803 select_timeout.tv_usec > 50000)) {
804 select_timeout.tv_sec = 0;
805 select_timeout.tv_usec = 50000;
806 }
807
808 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
809 }
810 }
811 #else
812 while (slot->in_use) {
813 slot->curl_result = curl_easy_perform(slot->curl);
814 finish_active_slot(slot);
815 }
816 #endif
817 }
818
819 static void release_active_slot(struct active_request_slot *slot)
820 {
821 closedown_active_slot(slot);
822 if (slot->curl && curl_session_count > min_curl_sessions) {
823 #ifdef USE_CURL_MULTI
824 curl_multi_remove_handle(curlm, slot->curl);
825 #endif
826 curl_easy_cleanup(slot->curl);
827 slot->curl = NULL;
828 curl_session_count--;
829 }
830 #ifdef USE_CURL_MULTI
831 fill_active_slots();
832 #endif
833 }
834
835 void finish_all_active_slots(void)
836 {
837 struct active_request_slot *slot = active_queue_head;
838
839 while (slot != NULL)
840 if (slot->in_use) {
841 run_active_slot(slot);
842 slot = active_queue_head;
843 } else {
844 slot = slot->next;
845 }
846 }
847
848 /* Helpers for modifying and creating URLs */
849 static inline int needs_quote(int ch)
850 {
851 if (((ch >= 'A') && (ch <= 'Z'))
852 || ((ch >= 'a') && (ch <= 'z'))
853 || ((ch >= '0') && (ch <= '9'))
854 || (ch == '/')
855 || (ch == '-')
856 || (ch == '.'))
857 return 0;
858 return 1;
859 }
860
861 static char *quote_ref_url(const char *base, const char *ref)
862 {
863 struct strbuf buf = STRBUF_INIT;
864 const char *cp;
865 int ch;
866
867 end_url_with_slash(&buf, base);
868
869 for (cp = ref; (ch = *cp) != 0; cp++)
870 if (needs_quote(ch))
871 strbuf_addf(&buf, "%%%02x", ch);
872 else
873 strbuf_addch(&buf, *cp);
874
875 return strbuf_detach(&buf, NULL);
876 }
877
878 void append_remote_object_url(struct strbuf *buf, const char *url,
879 const char *hex,
880 int only_two_digit_prefix)
881 {
882 end_url_with_slash(buf, url);
883
884 strbuf_addf(buf, "objects/%.*s/", 2, hex);
885 if (!only_two_digit_prefix)
886 strbuf_addf(buf, "%s", hex+2);
887 }
888
889 char *get_remote_object_url(const char *url, const char *hex,
890 int only_two_digit_prefix)
891 {
892 struct strbuf buf = STRBUF_INIT;
893 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
894 return strbuf_detach(&buf, NULL);
895 }
896
897 static int handle_curl_result(struct slot_results *results)
898 {
899 /*
900 * If we see a failing http code with CURLE_OK, we have turned off
901 * FAILONERROR (to keep the server's custom error response), and should
902 * translate the code into failure here.
903 */
904 if (results->curl_result == CURLE_OK &&
905 results->http_code >= 400) {
906 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
907 /*
908 * Normally curl will already have put the "reason phrase"
909 * from the server into curl_errorstr; unfortunately without
910 * FAILONERROR it is lost, so we can give only the numeric
911 * status code.
912 */
913 snprintf(curl_errorstr, sizeof(curl_errorstr),
914 "The requested URL returned error: %ld",
915 results->http_code);
916 }
917
918 if (results->curl_result == CURLE_OK) {
919 credential_approve(&http_auth);
920 return HTTP_OK;
921 } else if (missing_target(results))
922 return HTTP_MISSING_TARGET;
923 else if (results->http_code == 401) {
924 if (http_auth.username && http_auth.password) {
925 credential_reject(&http_auth);
926 return HTTP_NOAUTH;
927 } else {
928 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
929 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
930 #endif
931 return HTTP_REAUTH;
932 }
933 } else {
934 #if LIBCURL_VERSION_NUM >= 0x070c00
935 if (!curl_errorstr[0])
936 strlcpy(curl_errorstr,
937 curl_easy_strerror(results->curl_result),
938 sizeof(curl_errorstr));
939 #endif
940 return HTTP_ERROR;
941 }
942 }
943
944 int run_one_slot(struct active_request_slot *slot,
945 struct slot_results *results)
946 {
947 slot->results = results;
948 if (!start_active_slot(slot)) {
949 snprintf(curl_errorstr, sizeof(curl_errorstr),
950 "failed to start HTTP request");
951 return HTTP_START_FAILED;
952 }
953
954 run_active_slot(slot);
955 return handle_curl_result(results);
956 }
957
958 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
959 {
960 char *ptr;
961 CURLcode ret;
962
963 strbuf_reset(buf);
964 ret = curl_easy_getinfo(curl, info, &ptr);
965 if (!ret && ptr)
966 strbuf_addstr(buf, ptr);
967 return ret;
968 }
969
970 /*
971 * Check for and extract a content-type parameter. "raw"
972 * should be positioned at the start of the potential
973 * parameter, with any whitespace already removed.
974 *
975 * "name" is the name of the parameter. The value is appended
976 * to "out".
977 */
978 static int extract_param(const char *raw, const char *name,
979 struct strbuf *out)
980 {
981 size_t len = strlen(name);
982
983 if (strncasecmp(raw, name, len))
984 return -1;
985 raw += len;
986
987 if (*raw != '=')
988 return -1;
989 raw++;
990
991 while (*raw && !isspace(*raw) && *raw != ';')
992 strbuf_addch(out, *raw++);
993 return 0;
994 }
995
996 /*
997 * Extract a normalized version of the content type, with any
998 * spaces suppressed, all letters lowercased, and no trailing ";"
999 * or parameters.
1000 *
1001 * Note that we will silently remove even invalid whitespace. For
1002 * example, "text / plain" is specifically forbidden by RFC 2616,
1003 * but "text/plain" is the only reasonable output, and this keeps
1004 * our code simple.
1005 *
1006 * If the "charset" argument is not NULL, store the value of any
1007 * charset parameter there.
1008 *
1009 * Example:
1010 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1011 * "text / plain" -> "text/plain"
1012 */
1013 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1014 struct strbuf *charset)
1015 {
1016 const char *p;
1017
1018 strbuf_reset(type);
1019 strbuf_grow(type, raw->len);
1020 for (p = raw->buf; *p; p++) {
1021 if (isspace(*p))
1022 continue;
1023 if (*p == ';') {
1024 p++;
1025 break;
1026 }
1027 strbuf_addch(type, tolower(*p));
1028 }
1029
1030 if (!charset)
1031 return;
1032
1033 strbuf_reset(charset);
1034 while (*p) {
1035 while (isspace(*p) || *p == ';')
1036 p++;
1037 if (!extract_param(p, "charset", charset))
1038 return;
1039 while (*p && !isspace(*p))
1040 p++;
1041 }
1042
1043 if (!charset->len && starts_with(type->buf, "text/"))
1044 strbuf_addstr(charset, "ISO-8859-1");
1045 }
1046
1047 static void write_accept_language(struct strbuf *buf)
1048 {
1049 /*
1050 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1051 * that, q-value will be smaller than 0.001, the minimum q-value the
1052 * HTTP specification allows. See
1053 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1054 */
1055 const int MAX_DECIMAL_PLACES = 3;
1056 const int MAX_LANGUAGE_TAGS = 1000;
1057 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1058 char **language_tags = NULL;
1059 int num_langs = 0;
1060 const char *s = get_preferred_languages();
1061 int i;
1062 struct strbuf tag = STRBUF_INIT;
1063
1064 /* Don't add Accept-Language header if no language is preferred. */
1065 if (!s)
1066 return;
1067
1068 /*
1069 * Split the colon-separated string of preferred languages into
1070 * language_tags array.
1071 */
1072 do {
1073 /* collect language tag */
1074 for (; *s && (isalnum(*s) || *s == '_'); s++)
1075 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1076
1077 /* skip .codeset, @modifier and any other unnecessary parts */
1078 while (*s && *s != ':')
1079 s++;
1080
1081 if (tag.len) {
1082 num_langs++;
1083 REALLOC_ARRAY(language_tags, num_langs);
1084 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1085 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1086 break;
1087 }
1088 } while (*s++);
1089
1090 /* write Accept-Language header into buf */
1091 if (num_langs) {
1092 int last_buf_len = 0;
1093 int max_q;
1094 int decimal_places;
1095 char q_format[32];
1096
1097 /* add '*' */
1098 REALLOC_ARRAY(language_tags, num_langs + 1);
1099 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1100
1101 /* compute decimal_places */
1102 for (max_q = 1, decimal_places = 0;
1103 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1104 decimal_places++, max_q *= 10)
1105 ;
1106
1107 sprintf(q_format, ";q=0.%%0%dd", decimal_places);
1108
1109 strbuf_addstr(buf, "Accept-Language: ");
1110
1111 for (i = 0; i < num_langs; i++) {
1112 if (i > 0)
1113 strbuf_addstr(buf, ", ");
1114
1115 strbuf_addstr(buf, language_tags[i]);
1116
1117 if (i > 0)
1118 strbuf_addf(buf, q_format, max_q - i);
1119
1120 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1121 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1122 break;
1123 }
1124
1125 last_buf_len = buf->len;
1126 }
1127 }
1128
1129 /* free language tags -- last one is a static '*' */
1130 for (i = 0; i < num_langs - 1; i++)
1131 free(language_tags[i]);
1132 free(language_tags);
1133 }
1134
1135 /*
1136 * Get an Accept-Language header which indicates user's preferred languages.
1137 *
1138 * Examples:
1139 * LANGUAGE= -> ""
1140 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1141 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1142 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1143 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1144 * LANGUAGE= LANG=C -> ""
1145 */
1146 static const char *get_accept_language(void)
1147 {
1148 if (!cached_accept_language) {
1149 struct strbuf buf = STRBUF_INIT;
1150 write_accept_language(&buf);
1151 if (buf.len > 0)
1152 cached_accept_language = strbuf_detach(&buf, NULL);
1153 }
1154
1155 return cached_accept_language;
1156 }
1157
1158 /* http_request() targets */
1159 #define HTTP_REQUEST_STRBUF 0
1160 #define HTTP_REQUEST_FILE 1
1161
1162 static int http_request(const char *url,
1163 void *result, int target,
1164 const struct http_get_options *options)
1165 {
1166 struct active_request_slot *slot;
1167 struct slot_results results;
1168 struct curl_slist *headers = NULL;
1169 struct strbuf buf = STRBUF_INIT;
1170 const char *accept_language;
1171 int ret;
1172
1173 slot = get_active_slot();
1174 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1175
1176 if (result == NULL) {
1177 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1178 } else {
1179 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1180 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1181
1182 if (target == HTTP_REQUEST_FILE) {
1183 long posn = ftell(result);
1184 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1185 fwrite);
1186 if (posn > 0) {
1187 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1188 headers = curl_slist_append(headers, buf.buf);
1189 strbuf_reset(&buf);
1190 }
1191 } else
1192 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1193 fwrite_buffer);
1194 }
1195
1196 accept_language = get_accept_language();
1197
1198 if (accept_language)
1199 headers = curl_slist_append(headers, accept_language);
1200
1201 strbuf_addstr(&buf, "Pragma:");
1202 if (options && options->no_cache)
1203 strbuf_addstr(&buf, " no-cache");
1204 if (options && options->keep_error)
1205 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1206
1207 headers = curl_slist_append(headers, buf.buf);
1208
1209 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1210 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1211 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1212
1213 ret = run_one_slot(slot, &results);
1214
1215 if (options && options->content_type) {
1216 struct strbuf raw = STRBUF_INIT;
1217 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1218 extract_content_type(&raw, options->content_type,
1219 options->charset);
1220 strbuf_release(&raw);
1221 }
1222
1223 if (options && options->effective_url)
1224 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1225 options->effective_url);
1226
1227 curl_slist_free_all(headers);
1228 strbuf_release(&buf);
1229
1230 return ret;
1231 }
1232
1233 /*
1234 * Update the "base" url to a more appropriate value, as deduced by
1235 * redirects seen when requesting a URL starting with "url".
1236 *
1237 * The "asked" parameter is a URL that we asked curl to access, and must begin
1238 * with "base".
1239 *
1240 * The "got" parameter is the URL that curl reported to us as where we ended
1241 * up.
1242 *
1243 * Returns 1 if we updated the base url, 0 otherwise.
1244 *
1245 * Our basic strategy is to compare "base" and "asked" to find the bits
1246 * specific to our request. We then strip those bits off of "got" to yield the
1247 * new base. So for example, if our base is "http://example.com/foo.git",
1248 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1249 * with "https://other.example.com/foo.git/info/refs". We would want the
1250 * new URL to become "https://other.example.com/foo.git".
1251 *
1252 * Note that this assumes a sane redirect scheme. It's entirely possible
1253 * in the example above to end up at a URL that does not even end in
1254 * "info/refs". In such a case we simply punt, as there is not much we can
1255 * do (and such a scheme is unlikely to represent a real git repository,
1256 * which means we are likely about to abort anyway).
1257 */
1258 static int update_url_from_redirect(struct strbuf *base,
1259 const char *asked,
1260 const struct strbuf *got)
1261 {
1262 const char *tail;
1263 size_t tail_len;
1264
1265 if (!strcmp(asked, got->buf))
1266 return 0;
1267
1268 if (!skip_prefix(asked, base->buf, &tail))
1269 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1270 asked, base->buf);
1271
1272 tail_len = strlen(tail);
1273
1274 if (got->len < tail_len ||
1275 strcmp(tail, got->buf + got->len - tail_len))
1276 return 0; /* insane redirect scheme */
1277
1278 strbuf_reset(base);
1279 strbuf_add(base, got->buf, got->len - tail_len);
1280 return 1;
1281 }
1282
1283 static int http_request_reauth(const char *url,
1284 void *result, int target,
1285 struct http_get_options *options)
1286 {
1287 int ret = http_request(url, result, target, options);
1288
1289 if (options && options->effective_url && options->base_url) {
1290 if (update_url_from_redirect(options->base_url,
1291 url, options->effective_url)) {
1292 credential_from_url(&http_auth, options->base_url->buf);
1293 url = options->effective_url->buf;
1294 }
1295 }
1296
1297 if (ret != HTTP_REAUTH)
1298 return ret;
1299
1300 /*
1301 * If we are using KEEP_ERROR, the previous request may have
1302 * put cruft into our output stream; we should clear it out before
1303 * making our next request. We only know how to do this for
1304 * the strbuf case, but that is enough to satisfy current callers.
1305 */
1306 if (options && options->keep_error) {
1307 switch (target) {
1308 case HTTP_REQUEST_STRBUF:
1309 strbuf_reset(result);
1310 break;
1311 default:
1312 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1313 }
1314 }
1315
1316 credential_fill(&http_auth);
1317
1318 return http_request(url, result, target, options);
1319 }
1320
1321 int http_get_strbuf(const char *url,
1322 struct strbuf *result,
1323 struct http_get_options *options)
1324 {
1325 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1326 }
1327
1328 /*
1329 * Downloads a URL and stores the result in the given file.
1330 *
1331 * If a previous interrupted download is detected (i.e. a previous temporary
1332 * file is still around) the download is resumed.
1333 */
1334 static int http_get_file(const char *url, const char *filename,
1335 struct http_get_options *options)
1336 {
1337 int ret;
1338 struct strbuf tmpfile = STRBUF_INIT;
1339 FILE *result;
1340
1341 strbuf_addf(&tmpfile, "%s.temp", filename);
1342 result = fopen(tmpfile.buf, "a");
1343 if (!result) {
1344 error("Unable to open local file %s", tmpfile.buf);
1345 ret = HTTP_ERROR;
1346 goto cleanup;
1347 }
1348
1349 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1350 fclose(result);
1351
1352 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1353 ret = HTTP_ERROR;
1354 cleanup:
1355 strbuf_release(&tmpfile);
1356 return ret;
1357 }
1358
1359 int http_fetch_ref(const char *base, struct ref *ref)
1360 {
1361 struct http_get_options options = {0};
1362 char *url;
1363 struct strbuf buffer = STRBUF_INIT;
1364 int ret = -1;
1365
1366 options.no_cache = 1;
1367
1368 url = quote_ref_url(base, ref->name);
1369 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1370 strbuf_rtrim(&buffer);
1371 if (buffer.len == 40)
1372 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1373 else if (starts_with(buffer.buf, "ref: ")) {
1374 ref->symref = xstrdup(buffer.buf + 5);
1375 ret = 0;
1376 }
1377 }
1378
1379 strbuf_release(&buffer);
1380 free(url);
1381 return ret;
1382 }
1383
1384 /* Helpers for fetching packs */
1385 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1386 {
1387 char *url, *tmp;
1388 struct strbuf buf = STRBUF_INIT;
1389
1390 if (http_is_verbose)
1391 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1392
1393 end_url_with_slash(&buf, base_url);
1394 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1395 url = strbuf_detach(&buf, NULL);
1396
1397 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1398 tmp = strbuf_detach(&buf, NULL);
1399
1400 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1401 error("Unable to get pack index %s", url);
1402 free(tmp);
1403 tmp = NULL;
1404 }
1405
1406 free(url);
1407 return tmp;
1408 }
1409
1410 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1411 unsigned char *sha1, const char *base_url)
1412 {
1413 struct packed_git *new_pack;
1414 char *tmp_idx = NULL;
1415 int ret;
1416
1417 if (has_pack_index(sha1)) {
1418 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1419 if (!new_pack)
1420 return -1; /* parse_pack_index() already issued error message */
1421 goto add_pack;
1422 }
1423
1424 tmp_idx = fetch_pack_index(sha1, base_url);
1425 if (!tmp_idx)
1426 return -1;
1427
1428 new_pack = parse_pack_index(sha1, tmp_idx);
1429 if (!new_pack) {
1430 unlink(tmp_idx);
1431 free(tmp_idx);
1432
1433 return -1; /* parse_pack_index() already issued error message */
1434 }
1435
1436 ret = verify_pack_index(new_pack);
1437 if (!ret) {
1438 close_pack_index(new_pack);
1439 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1440 }
1441 free(tmp_idx);
1442 if (ret)
1443 return -1;
1444
1445 add_pack:
1446 new_pack->next = *packs_head;
1447 *packs_head = new_pack;
1448 return 0;
1449 }
1450
1451 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1452 {
1453 struct http_get_options options = {0};
1454 int ret = 0, i = 0;
1455 char *url, *data;
1456 struct strbuf buf = STRBUF_INIT;
1457 unsigned char sha1[20];
1458
1459 end_url_with_slash(&buf, base_url);
1460 strbuf_addstr(&buf, "objects/info/packs");
1461 url = strbuf_detach(&buf, NULL);
1462
1463 options.no_cache = 1;
1464 ret = http_get_strbuf(url, &buf, &options);
1465 if (ret != HTTP_OK)
1466 goto cleanup;
1467
1468 data = buf.buf;
1469 while (i < buf.len) {
1470 switch (data[i]) {
1471 case 'P':
1472 i++;
1473 if (i + 52 <= buf.len &&
1474 starts_with(data + i, " pack-") &&
1475 starts_with(data + i + 46, ".pack\n")) {
1476 get_sha1_hex(data + i + 6, sha1);
1477 fetch_and_setup_pack_index(packs_head, sha1,
1478 base_url);
1479 i += 51;
1480 break;
1481 }
1482 default:
1483 while (i < buf.len && data[i] != '\n')
1484 i++;
1485 }
1486 i++;
1487 }
1488
1489 cleanup:
1490 free(url);
1491 return ret;
1492 }
1493
1494 void release_http_pack_request(struct http_pack_request *preq)
1495 {
1496 if (preq->packfile != NULL) {
1497 fclose(preq->packfile);
1498 preq->packfile = NULL;
1499 }
1500 if (preq->range_header != NULL) {
1501 curl_slist_free_all(preq->range_header);
1502 preq->range_header = NULL;
1503 }
1504 preq->slot = NULL;
1505 free(preq->url);
1506 free(preq);
1507 }
1508
1509 int finish_http_pack_request(struct http_pack_request *preq)
1510 {
1511 struct packed_git **lst;
1512 struct packed_git *p = preq->target;
1513 char *tmp_idx;
1514 struct child_process ip = CHILD_PROCESS_INIT;
1515 const char *ip_argv[8];
1516
1517 close_pack_index(p);
1518
1519 fclose(preq->packfile);
1520 preq->packfile = NULL;
1521
1522 lst = preq->lst;
1523 while (*lst != p)
1524 lst = &((*lst)->next);
1525 *lst = (*lst)->next;
1526
1527 tmp_idx = xstrdup(preq->tmpfile);
1528 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1529 ".idx.temp");
1530
1531 ip_argv[0] = "index-pack";
1532 ip_argv[1] = "-o";
1533 ip_argv[2] = tmp_idx;
1534 ip_argv[3] = preq->tmpfile;
1535 ip_argv[4] = NULL;
1536
1537 ip.argv = ip_argv;
1538 ip.git_cmd = 1;
1539 ip.no_stdin = 1;
1540 ip.no_stdout = 1;
1541
1542 if (run_command(&ip)) {
1543 unlink(preq->tmpfile);
1544 unlink(tmp_idx);
1545 free(tmp_idx);
1546 return -1;
1547 }
1548
1549 unlink(sha1_pack_index_name(p->sha1));
1550
1551 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1552 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1553 free(tmp_idx);
1554 return -1;
1555 }
1556
1557 install_packed_git(p);
1558 free(tmp_idx);
1559 return 0;
1560 }
1561
1562 struct http_pack_request *new_http_pack_request(
1563 struct packed_git *target, const char *base_url)
1564 {
1565 long prev_posn = 0;
1566 char range[RANGE_HEADER_SIZE];
1567 struct strbuf buf = STRBUF_INIT;
1568 struct http_pack_request *preq;
1569
1570 preq = xcalloc(1, sizeof(*preq));
1571 preq->target = target;
1572
1573 end_url_with_slash(&buf, base_url);
1574 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1575 sha1_to_hex(target->sha1));
1576 preq->url = strbuf_detach(&buf, NULL);
1577
1578 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1579 sha1_pack_name(target->sha1));
1580 preq->packfile = fopen(preq->tmpfile, "a");
1581 if (!preq->packfile) {
1582 error("Unable to open local file %s for pack",
1583 preq->tmpfile);
1584 goto abort;
1585 }
1586
1587 preq->slot = get_active_slot();
1588 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1589 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1590 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1591 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1592 no_pragma_header);
1593
1594 /*
1595 * If there is data present from a previous transfer attempt,
1596 * resume where it left off
1597 */
1598 prev_posn = ftell(preq->packfile);
1599 if (prev_posn>0) {
1600 if (http_is_verbose)
1601 fprintf(stderr,
1602 "Resuming fetch of pack %s at byte %ld\n",
1603 sha1_to_hex(target->sha1), prev_posn);
1604 sprintf(range, "Range: bytes=%ld-", prev_posn);
1605 preq->range_header = curl_slist_append(NULL, range);
1606 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1607 preq->range_header);
1608 }
1609
1610 return preq;
1611
1612 abort:
1613 free(preq->url);
1614 free(preq);
1615 return NULL;
1616 }
1617
1618 /* Helpers for fetching objects (loose) */
1619 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1620 void *data)
1621 {
1622 unsigned char expn[4096];
1623 size_t size = eltsize * nmemb;
1624 int posn = 0;
1625 struct http_object_request *freq =
1626 (struct http_object_request *)data;
1627 do {
1628 ssize_t retval = xwrite(freq->localfile,
1629 (char *) ptr + posn, size - posn);
1630 if (retval < 0)
1631 return posn;
1632 posn += retval;
1633 } while (posn < size);
1634
1635 freq->stream.avail_in = size;
1636 freq->stream.next_in = (void *)ptr;
1637 do {
1638 freq->stream.next_out = expn;
1639 freq->stream.avail_out = sizeof(expn);
1640 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1641 git_SHA1_Update(&freq->c, expn,
1642 sizeof(expn) - freq->stream.avail_out);
1643 } while (freq->stream.avail_in && freq->zret == Z_OK);
1644 return size;
1645 }
1646
1647 struct http_object_request *new_http_object_request(const char *base_url,
1648 unsigned char *sha1)
1649 {
1650 char *hex = sha1_to_hex(sha1);
1651 const char *filename;
1652 char prevfile[PATH_MAX];
1653 int prevlocal;
1654 char prev_buf[PREV_BUF_SIZE];
1655 ssize_t prev_read = 0;
1656 long prev_posn = 0;
1657 char range[RANGE_HEADER_SIZE];
1658 struct curl_slist *range_header = NULL;
1659 struct http_object_request *freq;
1660
1661 freq = xcalloc(1, sizeof(*freq));
1662 hashcpy(freq->sha1, sha1);
1663 freq->localfile = -1;
1664
1665 filename = sha1_file_name(sha1);
1666 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1667 "%s.temp", filename);
1668
1669 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1670 unlink_or_warn(prevfile);
1671 rename(freq->tmpfile, prevfile);
1672 unlink_or_warn(freq->tmpfile);
1673
1674 if (freq->localfile != -1)
1675 error("fd leakage in start: %d", freq->localfile);
1676 freq->localfile = open(freq->tmpfile,
1677 O_WRONLY | O_CREAT | O_EXCL, 0666);
1678 /*
1679 * This could have failed due to the "lazy directory creation";
1680 * try to mkdir the last path component.
1681 */
1682 if (freq->localfile < 0 && errno == ENOENT) {
1683 char *dir = strrchr(freq->tmpfile, '/');
1684 if (dir) {
1685 *dir = 0;
1686 mkdir(freq->tmpfile, 0777);
1687 *dir = '/';
1688 }
1689 freq->localfile = open(freq->tmpfile,
1690 O_WRONLY | O_CREAT | O_EXCL, 0666);
1691 }
1692
1693 if (freq->localfile < 0) {
1694 error("Couldn't create temporary file %s: %s",
1695 freq->tmpfile, strerror(errno));
1696 goto abort;
1697 }
1698
1699 git_inflate_init(&freq->stream);
1700
1701 git_SHA1_Init(&freq->c);
1702
1703 freq->url = get_remote_object_url(base_url, hex, 0);
1704
1705 /*
1706 * If a previous temp file is present, process what was already
1707 * fetched.
1708 */
1709 prevlocal = open(prevfile, O_RDONLY);
1710 if (prevlocal != -1) {
1711 do {
1712 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1713 if (prev_read>0) {
1714 if (fwrite_sha1_file(prev_buf,
1715 1,
1716 prev_read,
1717 freq) == prev_read) {
1718 prev_posn += prev_read;
1719 } else {
1720 prev_read = -1;
1721 }
1722 }
1723 } while (prev_read > 0);
1724 close(prevlocal);
1725 }
1726 unlink_or_warn(prevfile);
1727
1728 /*
1729 * Reset inflate/SHA1 if there was an error reading the previous temp
1730 * file; also rewind to the beginning of the local file.
1731 */
1732 if (prev_read == -1) {
1733 memset(&freq->stream, 0, sizeof(freq->stream));
1734 git_inflate_init(&freq->stream);
1735 git_SHA1_Init(&freq->c);
1736 if (prev_posn>0) {
1737 prev_posn = 0;
1738 lseek(freq->localfile, 0, SEEK_SET);
1739 if (ftruncate(freq->localfile, 0) < 0) {
1740 error("Couldn't truncate temporary file %s: %s",
1741 freq->tmpfile, strerror(errno));
1742 goto abort;
1743 }
1744 }
1745 }
1746
1747 freq->slot = get_active_slot();
1748
1749 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1750 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1751 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1752 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1753 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1754
1755 /*
1756 * If we have successfully processed data from a previous fetch
1757 * attempt, only fetch the data we don't already have.
1758 */
1759 if (prev_posn>0) {
1760 if (http_is_verbose)
1761 fprintf(stderr,
1762 "Resuming fetch of object %s at byte %ld\n",
1763 hex, prev_posn);
1764 sprintf(range, "Range: bytes=%ld-", prev_posn);
1765 range_header = curl_slist_append(range_header, range);
1766 curl_easy_setopt(freq->slot->curl,
1767 CURLOPT_HTTPHEADER, range_header);
1768 }
1769
1770 return freq;
1771
1772 abort:
1773 free(freq->url);
1774 free(freq);
1775 return NULL;
1776 }
1777
1778 void process_http_object_request(struct http_object_request *freq)
1779 {
1780 if (freq->slot == NULL)
1781 return;
1782 freq->curl_result = freq->slot->curl_result;
1783 freq->http_code = freq->slot->http_code;
1784 freq->slot = NULL;
1785 }
1786
1787 int finish_http_object_request(struct http_object_request *freq)
1788 {
1789 struct stat st;
1790
1791 close(freq->localfile);
1792 freq->localfile = -1;
1793
1794 process_http_object_request(freq);
1795
1796 if (freq->http_code == 416) {
1797 warning("requested range invalid; we may already have all the data.");
1798 } else if (freq->curl_result != CURLE_OK) {
1799 if (stat(freq->tmpfile, &st) == 0)
1800 if (st.st_size == 0)
1801 unlink_or_warn(freq->tmpfile);
1802 return -1;
1803 }
1804
1805 git_inflate_end(&freq->stream);
1806 git_SHA1_Final(freq->real_sha1, &freq->c);
1807 if (freq->zret != Z_STREAM_END) {
1808 unlink_or_warn(freq->tmpfile);
1809 return -1;
1810 }
1811 if (hashcmp(freq->sha1, freq->real_sha1)) {
1812 unlink_or_warn(freq->tmpfile);
1813 return -1;
1814 }
1815 freq->rename =
1816 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
1817
1818 return freq->rename;
1819 }
1820
1821 void abort_http_object_request(struct http_object_request *freq)
1822 {
1823 unlink_or_warn(freq->tmpfile);
1824
1825 release_http_object_request(freq);
1826 }
1827
1828 void release_http_object_request(struct http_object_request *freq)
1829 {
1830 if (freq->localfile != -1) {
1831 close(freq->localfile);
1832 freq->localfile = -1;
1833 }
1834 if (freq->url != NULL) {
1835 free(freq->url);
1836 freq->url = NULL;
1837 }
1838 if (freq->slot != NULL) {
1839 freq->slot->callback_func = NULL;
1840 freq->slot->callback_data = NULL;
1841 release_active_slot(freq->slot);
1842 freq->slot = NULL;
1843 }
1844 }
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