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git.c: make it clear save_env() is for alias handling only
[alt-git.git] / http.c
blob45348fb9bd7d2713bed668f6ef8ffb43783601ff
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 #include "transport.h"
13
14 int active_requests;
15 int http_is_verbose;
16 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
17
18 #if LIBCURL_VERSION_NUM >= 0x070a06
19 #define LIBCURL_CAN_HANDLE_AUTH_ANY
20 #endif
21
22 static int min_curl_sessions = 1;
23 static int curl_session_count;
24 #ifdef USE_CURL_MULTI
25 static int max_requests = -1;
26 static CURLM *curlm;
27 #endif
28 #ifndef NO_CURL_EASY_DUPHANDLE
29 static CURL *curl_default;
30 #endif
31
32 #define PREV_BUF_SIZE 4096
33 #define RANGE_HEADER_SIZE 30
34
35 char curl_errorstr[CURL_ERROR_SIZE];
36
37 static int curl_ssl_verify = -1;
38 static int curl_ssl_try;
39 static const char *ssl_cert;
40 static const char *ssl_cipherlist;
41 #if LIBCURL_VERSION_NUM >= 0x070903
42 static const char *ssl_key;
43 #endif
44 #if LIBCURL_VERSION_NUM >= 0x070908
45 static const char *ssl_capath;
46 #endif
47 static const char *ssl_cainfo;
48 static long curl_low_speed_limit = -1;
49 static long curl_low_speed_time = -1;
50 static int curl_ftp_no_epsv;
51 static const char *curl_http_proxy;
52 static const char *curl_cookie_file;
53 static int curl_save_cookies;
54 struct credential http_auth = CREDENTIAL_INIT;
55 static int http_proactive_auth;
56 static const char *user_agent;
57
58 #if LIBCURL_VERSION_NUM >= 0x071700
59 /* Use CURLOPT_KEYPASSWD as is */
60 #elif LIBCURL_VERSION_NUM >= 0x070903
61 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
62 #else
63 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
64 #endif
65
66 static struct credential cert_auth = CREDENTIAL_INIT;
67 static int ssl_cert_password_required;
68 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
69 static unsigned long http_auth_methods = CURLAUTH_ANY;
70 #endif
71
72 static struct curl_slist *pragma_header;
73 static struct curl_slist *no_pragma_header;
74
75 static struct active_request_slot *active_queue_head;
76
77 static char *cached_accept_language;
78
79 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
80 {
81 size_t size = eltsize * nmemb;
82 struct buffer *buffer = buffer_;
83
84 if (size > buffer->buf.len - buffer->posn)
85 size = buffer->buf.len - buffer->posn;
86 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
87 buffer->posn += size;
88
89 return size;
90 }
91
92 #ifndef NO_CURL_IOCTL
93 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
94 {
95 struct buffer *buffer = clientp;
96
97 switch (cmd) {
98 case CURLIOCMD_NOP:
99 return CURLIOE_OK;
100
101 case CURLIOCMD_RESTARTREAD:
102 buffer->posn = 0;
103 return CURLIOE_OK;
104
105 default:
106 return CURLIOE_UNKNOWNCMD;
107 }
108 }
109 #endif
110
111 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
112 {
113 size_t size = eltsize * nmemb;
114 struct strbuf *buffer = buffer_;
115
116 strbuf_add(buffer, ptr, size);
117 return size;
118 }
119
120 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
121 {
122 return eltsize * nmemb;
123 }
124
125 static void closedown_active_slot(struct active_request_slot *slot)
126 {
127 active_requests--;
128 slot->in_use = 0;
129 }
130
131 static void finish_active_slot(struct active_request_slot *slot)
132 {
133 closedown_active_slot(slot);
134 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
135
136 if (slot->finished != NULL)
137 (*slot->finished) = 1;
138
139 /* Store slot results so they can be read after the slot is reused */
140 if (slot->results != NULL) {
141 slot->results->curl_result = slot->curl_result;
142 slot->results->http_code = slot->http_code;
143 #if LIBCURL_VERSION_NUM >= 0x070a08
144 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
145 &slot->results->auth_avail);
146 #else
147 slot->results->auth_avail = 0;
148 #endif
149 }
150
151 /* Run callback if appropriate */
152 if (slot->callback_func != NULL)
153 slot->callback_func(slot->callback_data);
154 }
155
156 #ifdef USE_CURL_MULTI
157 static void process_curl_messages(void)
158 {
159 int num_messages;
160 struct active_request_slot *slot;
161 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
162
163 while (curl_message != NULL) {
164 if (curl_message->msg == CURLMSG_DONE) {
165 int curl_result = curl_message->data.result;
166 slot = active_queue_head;
167 while (slot != NULL &&
168 slot->curl != curl_message->easy_handle)
169 slot = slot->next;
170 if (slot != NULL) {
171 curl_multi_remove_handle(curlm, slot->curl);
172 slot->curl_result = curl_result;
173 finish_active_slot(slot);
174 } else {
175 fprintf(stderr, "Received DONE message for unknown request!\n");
176 }
177 } else {
178 fprintf(stderr, "Unknown CURL message received: %d\n",
179 (int)curl_message->msg);
180 }
181 curl_message = curl_multi_info_read(curlm, &num_messages);
182 }
183 }
184 #endif
185
186 static int http_options(const char *var, const char *value, void *cb)
187 {
188 if (!strcmp("http.sslverify", var)) {
189 curl_ssl_verify = git_config_bool(var, value);
190 return 0;
191 }
192 if (!strcmp("http.sslcipherlist", var))
193 return git_config_string(&ssl_cipherlist, var, value);
194 if (!strcmp("http.sslcert", var))
195 return git_config_string(&ssl_cert, var, value);
196 #if LIBCURL_VERSION_NUM >= 0x070903
197 if (!strcmp("http.sslkey", var))
198 return git_config_string(&ssl_key, var, value);
199 #endif
200 #if LIBCURL_VERSION_NUM >= 0x070908
201 if (!strcmp("http.sslcapath", var))
202 return git_config_string(&ssl_capath, var, value);
203 #endif
204 if (!strcmp("http.sslcainfo", var))
205 return git_config_string(&ssl_cainfo, var, value);
206 if (!strcmp("http.sslcertpasswordprotected", var)) {
207 ssl_cert_password_required = git_config_bool(var, value);
208 return 0;
209 }
210 if (!strcmp("http.ssltry", var)) {
211 curl_ssl_try = git_config_bool(var, value);
212 return 0;
213 }
214 if (!strcmp("http.minsessions", var)) {
215 min_curl_sessions = git_config_int(var, value);
216 #ifndef USE_CURL_MULTI
217 if (min_curl_sessions > 1)
218 min_curl_sessions = 1;
219 #endif
220 return 0;
221 }
222 #ifdef USE_CURL_MULTI
223 if (!strcmp("http.maxrequests", var)) {
224 max_requests = git_config_int(var, value);
225 return 0;
226 }
227 #endif
228 if (!strcmp("http.lowspeedlimit", var)) {
229 curl_low_speed_limit = (long)git_config_int(var, value);
230 return 0;
231 }
232 if (!strcmp("http.lowspeedtime", var)) {
233 curl_low_speed_time = (long)git_config_int(var, value);
234 return 0;
235 }
236
237 if (!strcmp("http.noepsv", var)) {
238 curl_ftp_no_epsv = git_config_bool(var, value);
239 return 0;
240 }
241 if (!strcmp("http.proxy", var))
242 return git_config_string(&curl_http_proxy, var, value);
243
244 if (!strcmp("http.cookiefile", var))
245 return git_config_string(&curl_cookie_file, var, value);
246 if (!strcmp("http.savecookies", var)) {
247 curl_save_cookies = git_config_bool(var, value);
248 return 0;
249 }
250
251 if (!strcmp("http.postbuffer", var)) {
252 http_post_buffer = git_config_int(var, value);
253 if (http_post_buffer < LARGE_PACKET_MAX)
254 http_post_buffer = LARGE_PACKET_MAX;
255 return 0;
256 }
257
258 if (!strcmp("http.useragent", var))
259 return git_config_string(&user_agent, var, value);
260
261 /* Fall back on the default ones */
262 return git_default_config(var, value, cb);
263 }
264
265 static void init_curl_http_auth(CURL *result)
266 {
267 if (!http_auth.username)
268 return;
269
270 credential_fill(&http_auth);
271
272 #if LIBCURL_VERSION_NUM >= 0x071301
273 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
274 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
275 #else
276 {
277 static struct strbuf up = STRBUF_INIT;
278 /*
279 * Note that we assume we only ever have a single set of
280 * credentials in a given program run, so we do not have
281 * to worry about updating this buffer, only setting its
282 * initial value.
283 */
284 if (!up.len)
285 strbuf_addf(&up, "%s:%s",
286 http_auth.username, http_auth.password);
287 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
288 }
289 #endif
290 }
291
292 static int has_cert_password(void)
293 {
294 if (ssl_cert == NULL || ssl_cert_password_required != 1)
295 return 0;
296 if (!cert_auth.password) {
297 cert_auth.protocol = xstrdup("cert");
298 cert_auth.username = xstrdup("");
299 cert_auth.path = xstrdup(ssl_cert);
300 credential_fill(&cert_auth);
301 }
302 return 1;
303 }
304
305 #if LIBCURL_VERSION_NUM >= 0x071900
306 static void set_curl_keepalive(CURL *c)
307 {
308 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
309 }
310
311 #elif LIBCURL_VERSION_NUM >= 0x071000
312 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
313 {
314 int ka = 1;
315 int rc;
316 socklen_t len = (socklen_t)sizeof(ka);
317
318 if (type != CURLSOCKTYPE_IPCXN)
319 return 0;
320
321 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
322 if (rc < 0)
323 warning("unable to set SO_KEEPALIVE on socket %s",
324 strerror(errno));
325
326 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
327 }
328
329 static void set_curl_keepalive(CURL *c)
330 {
331 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
332 }
333
334 #else
335 static void set_curl_keepalive(CURL *c)
336 {
337 /* not supported on older curl versions */
338 }
339 #endif
340
341 static CURL *get_curl_handle(void)
342 {
343 CURL *result = curl_easy_init();
344 long allowed_protocols = 0;
345
346 if (!result)
347 die("curl_easy_init failed");
348
349 if (!curl_ssl_verify) {
350 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
351 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
352 } else {
353 /* Verify authenticity of the peer's certificate */
354 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
355 /* The name in the cert must match whom we tried to connect */
356 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
357 }
358
359 #if LIBCURL_VERSION_NUM >= 0x070907
360 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
361 #endif
362 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
363 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
364 #endif
365
366 if (http_proactive_auth)
367 init_curl_http_auth(result);
368
369 if (getenv("GIT_SSL_CIPHER_LIST"))
370 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
371
372 if (ssl_cipherlist != NULL && *ssl_cipherlist)
373 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
374 ssl_cipherlist);
375
376 if (ssl_cert != NULL)
377 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
378 if (has_cert_password())
379 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
380 #if LIBCURL_VERSION_NUM >= 0x070903
381 if (ssl_key != NULL)
382 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
383 #endif
384 #if LIBCURL_VERSION_NUM >= 0x070908
385 if (ssl_capath != NULL)
386 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
387 #endif
388 if (ssl_cainfo != NULL)
389 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
390
391 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
392 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
393 curl_low_speed_limit);
394 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
395 curl_low_speed_time);
396 }
397
398 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
399 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
400 #if LIBCURL_VERSION_NUM >= 0x071301
401 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
402 #elif LIBCURL_VERSION_NUM >= 0x071101
403 curl_easy_setopt(result, CURLOPT_POST301, 1);
404 #endif
405 #if LIBCURL_VERSION_NUM >= 0x071304
406 if (is_transport_allowed("http"))
407 allowed_protocols |= CURLPROTO_HTTP;
408 if (is_transport_allowed("https"))
409 allowed_protocols |= CURLPROTO_HTTPS;
410 if (is_transport_allowed("ftp"))
411 allowed_protocols |= CURLPROTO_FTP;
412 if (is_transport_allowed("ftps"))
413 allowed_protocols |= CURLPROTO_FTPS;
414 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
415 #else
416 if (transport_restrict_protocols())
417 warning("protocol restrictions not applied to curl redirects because\n"
418 "your curl version is too old (>= 7.19.4)");
419 #endif
420
421 if (getenv("GIT_CURL_VERBOSE"))
422 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
423
424 curl_easy_setopt(result, CURLOPT_USERAGENT,
425 user_agent ? user_agent : git_user_agent());
426
427 if (curl_ftp_no_epsv)
428 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
429
430 #ifdef CURLOPT_USE_SSL
431 if (curl_ssl_try)
432 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
433 #endif
434
435 if (curl_http_proxy) {
436 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
437 }
438 #if LIBCURL_VERSION_NUM >= 0x070a07
439 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
440 #endif
441
442 set_curl_keepalive(result);
443
444 return result;
445 }
446
447 static void set_from_env(const char **var, const char *envname)
448 {
449 const char *val = getenv(envname);
450 if (val)
451 *var = val;
452 }
453
454 void http_init(struct remote *remote, const char *url, int proactive_auth)
455 {
456 char *low_speed_limit;
457 char *low_speed_time;
458 char *normalized_url;
459 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
460
461 config.section = "http";
462 config.key = NULL;
463 config.collect_fn = http_options;
464 config.cascade_fn = git_default_config;
465 config.cb = NULL;
466
467 http_is_verbose = 0;
468 normalized_url = url_normalize(url, &config.url);
469
470 git_config(urlmatch_config_entry, &config);
471 free(normalized_url);
472
473 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
474 die("curl_global_init failed");
475
476 http_proactive_auth = proactive_auth;
477
478 if (remote && remote->http_proxy)
479 curl_http_proxy = xstrdup(remote->http_proxy);
480
481 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
482 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
483
484 #ifdef USE_CURL_MULTI
485 {
486 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
487 if (http_max_requests != NULL)
488 max_requests = atoi(http_max_requests);
489 }
490
491 curlm = curl_multi_init();
492 if (!curlm)
493 die("curl_multi_init failed");
494 #endif
495
496 if (getenv("GIT_SSL_NO_VERIFY"))
497 curl_ssl_verify = 0;
498
499 set_from_env(&ssl_cert, "GIT_SSL_CERT");
500 #if LIBCURL_VERSION_NUM >= 0x070903
501 set_from_env(&ssl_key, "GIT_SSL_KEY");
502 #endif
503 #if LIBCURL_VERSION_NUM >= 0x070908
504 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
505 #endif
506 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
507
508 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
509
510 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
511 if (low_speed_limit != NULL)
512 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
513 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
514 if (low_speed_time != NULL)
515 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
516
517 if (curl_ssl_verify == -1)
518 curl_ssl_verify = 1;
519
520 curl_session_count = 0;
521 #ifdef USE_CURL_MULTI
522 if (max_requests < 1)
523 max_requests = DEFAULT_MAX_REQUESTS;
524 #endif
525
526 if (getenv("GIT_CURL_FTP_NO_EPSV"))
527 curl_ftp_no_epsv = 1;
528
529 if (url) {
530 credential_from_url(&http_auth, url);
531 if (!ssl_cert_password_required &&
532 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
533 starts_with(url, "https://"))
534 ssl_cert_password_required = 1;
535 }
536
537 #ifndef NO_CURL_EASY_DUPHANDLE
538 curl_default = get_curl_handle();
539 #endif
540 }
541
542 void http_cleanup(void)
543 {
544 struct active_request_slot *slot = active_queue_head;
545
546 while (slot != NULL) {
547 struct active_request_slot *next = slot->next;
548 if (slot->curl != NULL) {
549 #ifdef USE_CURL_MULTI
550 curl_multi_remove_handle(curlm, slot->curl);
551 #endif
552 curl_easy_cleanup(slot->curl);
553 }
554 free(slot);
555 slot = next;
556 }
557 active_queue_head = NULL;
558
559 #ifndef NO_CURL_EASY_DUPHANDLE
560 curl_easy_cleanup(curl_default);
561 #endif
562
563 #ifdef USE_CURL_MULTI
564 curl_multi_cleanup(curlm);
565 #endif
566 curl_global_cleanup();
567
568 curl_slist_free_all(pragma_header);
569 pragma_header = NULL;
570
571 curl_slist_free_all(no_pragma_header);
572 no_pragma_header = NULL;
573
574 if (curl_http_proxy) {
575 free((void *)curl_http_proxy);
576 curl_http_proxy = NULL;
577 }
578
579 if (cert_auth.password != NULL) {
580 memset(cert_auth.password, 0, strlen(cert_auth.password));
581 free(cert_auth.password);
582 cert_auth.password = NULL;
583 }
584 ssl_cert_password_required = 0;
585
586 free(cached_accept_language);
587 cached_accept_language = NULL;
588 }
589
590 struct active_request_slot *get_active_slot(void)
591 {
592 struct active_request_slot *slot = active_queue_head;
593 struct active_request_slot *newslot;
594
595 #ifdef USE_CURL_MULTI
596 int num_transfers;
597
598 /* Wait for a slot to open up if the queue is full */
599 while (active_requests >= max_requests) {
600 curl_multi_perform(curlm, &num_transfers);
601 if (num_transfers < active_requests)
602 process_curl_messages();
603 }
604 #endif
605
606 while (slot != NULL && slot->in_use)
607 slot = slot->next;
608
609 if (slot == NULL) {
610 newslot = xmalloc(sizeof(*newslot));
611 newslot->curl = NULL;
612 newslot->in_use = 0;
613 newslot->next = NULL;
614
615 slot = active_queue_head;
616 if (slot == NULL) {
617 active_queue_head = newslot;
618 } else {
619 while (slot->next != NULL)
620 slot = slot->next;
621 slot->next = newslot;
622 }
623 slot = newslot;
624 }
625
626 if (slot->curl == NULL) {
627 #ifdef NO_CURL_EASY_DUPHANDLE
628 slot->curl = get_curl_handle();
629 #else
630 slot->curl = curl_easy_duphandle(curl_default);
631 #endif
632 curl_session_count++;
633 }
634
635 active_requests++;
636 slot->in_use = 1;
637 slot->results = NULL;
638 slot->finished = NULL;
639 slot->callback_data = NULL;
640 slot->callback_func = NULL;
641 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
642 if (curl_save_cookies)
643 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
644 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
645 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
646 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
647 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
648 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
649 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
650 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
651 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
652 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
653 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
654 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
655 #endif
656 if (http_auth.password)
657 init_curl_http_auth(slot->curl);
658
659 return slot;
660 }
661
662 int start_active_slot(struct active_request_slot *slot)
663 {
664 #ifdef USE_CURL_MULTI
665 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
666 int num_transfers;
667
668 if (curlm_result != CURLM_OK &&
669 curlm_result != CURLM_CALL_MULTI_PERFORM) {
670 active_requests--;
671 slot->in_use = 0;
672 return 0;
673 }
674
675 /*
676 * We know there must be something to do, since we just added
677 * something.
678 */
679 curl_multi_perform(curlm, &num_transfers);
680 #endif
681 return 1;
682 }
683
684 #ifdef USE_CURL_MULTI
685 struct fill_chain {
686 void *data;
687 int (*fill)(void *);
688 struct fill_chain *next;
689 };
690
691 static struct fill_chain *fill_cfg;
692
693 void add_fill_function(void *data, int (*fill)(void *))
694 {
695 struct fill_chain *new = xmalloc(sizeof(*new));
696 struct fill_chain **linkp = &fill_cfg;
697 new->data = data;
698 new->fill = fill;
699 new->next = NULL;
700 while (*linkp)
701 linkp = &(*linkp)->next;
702 *linkp = new;
703 }
704
705 void fill_active_slots(void)
706 {
707 struct active_request_slot *slot = active_queue_head;
708
709 while (active_requests < max_requests) {
710 struct fill_chain *fill;
711 for (fill = fill_cfg; fill; fill = fill->next)
712 if (fill->fill(fill->data))
713 break;
714
715 if (!fill)
716 break;
717 }
718
719 while (slot != NULL) {
720 if (!slot->in_use && slot->curl != NULL
721 && curl_session_count > min_curl_sessions) {
722 curl_easy_cleanup(slot->curl);
723 slot->curl = NULL;
724 curl_session_count--;
725 }
726 slot = slot->next;
727 }
728 }
729
730 void step_active_slots(void)
731 {
732 int num_transfers;
733 CURLMcode curlm_result;
734
735 do {
736 curlm_result = curl_multi_perform(curlm, &num_transfers);
737 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
738 if (num_transfers < active_requests) {
739 process_curl_messages();
740 fill_active_slots();
741 }
742 }
743 #endif
744
745 void run_active_slot(struct active_request_slot *slot)
746 {
747 #ifdef USE_CURL_MULTI
748 fd_set readfds;
749 fd_set writefds;
750 fd_set excfds;
751 int max_fd;
752 struct timeval select_timeout;
753 int finished = 0;
754
755 slot->finished = &finished;
756 while (!finished) {
757 step_active_slots();
758
759 if (slot->in_use) {
760 #if LIBCURL_VERSION_NUM >= 0x070f04
761 long curl_timeout;
762 curl_multi_timeout(curlm, &curl_timeout);
763 if (curl_timeout == 0) {
764 continue;
765 } else if (curl_timeout == -1) {
766 select_timeout.tv_sec = 0;
767 select_timeout.tv_usec = 50000;
768 } else {
769 select_timeout.tv_sec = curl_timeout / 1000;
770 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
771 }
772 #else
773 select_timeout.tv_sec = 0;
774 select_timeout.tv_usec = 50000;
775 #endif
776
777 max_fd = -1;
778 FD_ZERO(&readfds);
779 FD_ZERO(&writefds);
780 FD_ZERO(&excfds);
781 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
782
783 /*
784 * It can happen that curl_multi_timeout returns a pathologically
785 * long timeout when curl_multi_fdset returns no file descriptors
786 * to read. See commit message for more details.
787 */
788 if (max_fd < 0 &&
789 (select_timeout.tv_sec > 0 ||
790 select_timeout.tv_usec > 50000)) {
791 select_timeout.tv_sec = 0;
792 select_timeout.tv_usec = 50000;
793 }
794
795 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
796 }
797 }
798 #else
799 while (slot->in_use) {
800 slot->curl_result = curl_easy_perform(slot->curl);
801 finish_active_slot(slot);
802 }
803 #endif
804 }
805
806 static void release_active_slot(struct active_request_slot *slot)
807 {
808 closedown_active_slot(slot);
809 if (slot->curl && curl_session_count > min_curl_sessions) {
810 #ifdef USE_CURL_MULTI
811 curl_multi_remove_handle(curlm, slot->curl);
812 #endif
813 curl_easy_cleanup(slot->curl);
814 slot->curl = NULL;
815 curl_session_count--;
816 }
817 #ifdef USE_CURL_MULTI
818 fill_active_slots();
819 #endif
820 }
821
822 void finish_all_active_slots(void)
823 {
824 struct active_request_slot *slot = active_queue_head;
825
826 while (slot != NULL)
827 if (slot->in_use) {
828 run_active_slot(slot);
829 slot = active_queue_head;
830 } else {
831 slot = slot->next;
832 }
833 }
834
835 /* Helpers for modifying and creating URLs */
836 static inline int needs_quote(int ch)
837 {
838 if (((ch >= 'A') && (ch <= 'Z'))
839 || ((ch >= 'a') && (ch <= 'z'))
840 || ((ch >= '0') && (ch <= '9'))
841 || (ch == '/')
842 || (ch == '-')
843 || (ch == '.'))
844 return 0;
845 return 1;
846 }
847
848 static char *quote_ref_url(const char *base, const char *ref)
849 {
850 struct strbuf buf = STRBUF_INIT;
851 const char *cp;
852 int ch;
853
854 end_url_with_slash(&buf, base);
855
856 for (cp = ref; (ch = *cp) != 0; cp++)
857 if (needs_quote(ch))
858 strbuf_addf(&buf, "%%%02x", ch);
859 else
860 strbuf_addch(&buf, *cp);
861
862 return strbuf_detach(&buf, NULL);
863 }
864
865 void append_remote_object_url(struct strbuf *buf, const char *url,
866 const char *hex,
867 int only_two_digit_prefix)
868 {
869 end_url_with_slash(buf, url);
870
871 strbuf_addf(buf, "objects/%.*s/", 2, hex);
872 if (!only_two_digit_prefix)
873 strbuf_addf(buf, "%s", hex+2);
874 }
875
876 char *get_remote_object_url(const char *url, const char *hex,
877 int only_two_digit_prefix)
878 {
879 struct strbuf buf = STRBUF_INIT;
880 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
881 return strbuf_detach(&buf, NULL);
882 }
883
884 static int handle_curl_result(struct slot_results *results)
885 {
886 /*
887 * If we see a failing http code with CURLE_OK, we have turned off
888 * FAILONERROR (to keep the server's custom error response), and should
889 * translate the code into failure here.
890 */
891 if (results->curl_result == CURLE_OK &&
892 results->http_code >= 400) {
893 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
894 /*
895 * Normally curl will already have put the "reason phrase"
896 * from the server into curl_errorstr; unfortunately without
897 * FAILONERROR it is lost, so we can give only the numeric
898 * status code.
899 */
900 snprintf(curl_errorstr, sizeof(curl_errorstr),
901 "The requested URL returned error: %ld",
902 results->http_code);
903 }
904
905 if (results->curl_result == CURLE_OK) {
906 credential_approve(&http_auth);
907 return HTTP_OK;
908 } else if (missing_target(results))
909 return HTTP_MISSING_TARGET;
910 else if (results->http_code == 401) {
911 if (http_auth.username && http_auth.password) {
912 credential_reject(&http_auth);
913 return HTTP_NOAUTH;
914 } else {
915 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
916 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
917 #endif
918 return HTTP_REAUTH;
919 }
920 } else {
921 #if LIBCURL_VERSION_NUM >= 0x070c00
922 if (!curl_errorstr[0])
923 strlcpy(curl_errorstr,
924 curl_easy_strerror(results->curl_result),
925 sizeof(curl_errorstr));
926 #endif
927 return HTTP_ERROR;
928 }
929 }
930
931 int run_one_slot(struct active_request_slot *slot,
932 struct slot_results *results)
933 {
934 slot->results = results;
935 if (!start_active_slot(slot)) {
936 snprintf(curl_errorstr, sizeof(curl_errorstr),
937 "failed to start HTTP request");
938 return HTTP_START_FAILED;
939 }
940
941 run_active_slot(slot);
942 return handle_curl_result(results);
943 }
944
945 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
946 {
947 char *ptr;
948 CURLcode ret;
949
950 strbuf_reset(buf);
951 ret = curl_easy_getinfo(curl, info, &ptr);
952 if (!ret && ptr)
953 strbuf_addstr(buf, ptr);
954 return ret;
955 }
956
957 /*
958 * Check for and extract a content-type parameter. "raw"
959 * should be positioned at the start of the potential
960 * parameter, with any whitespace already removed.
961 *
962 * "name" is the name of the parameter. The value is appended
963 * to "out".
964 */
965 static int extract_param(const char *raw, const char *name,
966 struct strbuf *out)
967 {
968 size_t len = strlen(name);
969
970 if (strncasecmp(raw, name, len))
971 return -1;
972 raw += len;
973
974 if (*raw != '=')
975 return -1;
976 raw++;
977
978 while (*raw && !isspace(*raw) && *raw != ';')
979 strbuf_addch(out, *raw++);
980 return 0;
981 }
982
983 /*
984 * Extract a normalized version of the content type, with any
985 * spaces suppressed, all letters lowercased, and no trailing ";"
986 * or parameters.
987 *
988 * Note that we will silently remove even invalid whitespace. For
989 * example, "text / plain" is specifically forbidden by RFC 2616,
990 * but "text/plain" is the only reasonable output, and this keeps
991 * our code simple.
992 *
993 * If the "charset" argument is not NULL, store the value of any
994 * charset parameter there.
995 *
996 * Example:
997 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
998 * "text / plain" -> "text/plain"
999 */
1000 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1001 struct strbuf *charset)
1002 {
1003 const char *p;
1004
1005 strbuf_reset(type);
1006 strbuf_grow(type, raw->len);
1007 for (p = raw->buf; *p; p++) {
1008 if (isspace(*p))
1009 continue;
1010 if (*p == ';') {
1011 p++;
1012 break;
1013 }
1014 strbuf_addch(type, tolower(*p));
1015 }
1016
1017 if (!charset)
1018 return;
1019
1020 strbuf_reset(charset);
1021 while (*p) {
1022 while (isspace(*p) || *p == ';')
1023 p++;
1024 if (!extract_param(p, "charset", charset))
1025 return;
1026 while (*p && !isspace(*p))
1027 p++;
1028 }
1029
1030 if (!charset->len && starts_with(type->buf, "text/"))
1031 strbuf_addstr(charset, "ISO-8859-1");
1032 }
1033
1034 static void write_accept_language(struct strbuf *buf)
1035 {
1036 /*
1037 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1038 * that, q-value will be smaller than 0.001, the minimum q-value the
1039 * HTTP specification allows. See
1040 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1041 */
1042 const int MAX_DECIMAL_PLACES = 3;
1043 const int MAX_LANGUAGE_TAGS = 1000;
1044 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1045 char **language_tags = NULL;
1046 int num_langs = 0;
1047 const char *s = get_preferred_languages();
1048 int i;
1049 struct strbuf tag = STRBUF_INIT;
1050
1051 /* Don't add Accept-Language header if no language is preferred. */
1052 if (!s)
1053 return;
1054
1055 /*
1056 * Split the colon-separated string of preferred languages into
1057 * language_tags array.
1058 */
1059 do {
1060 /* collect language tag */
1061 for (; *s && (isalnum(*s) || *s == '_'); s++)
1062 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1063
1064 /* skip .codeset, @modifier and any other unnecessary parts */
1065 while (*s && *s != ':')
1066 s++;
1067
1068 if (tag.len) {
1069 num_langs++;
1070 REALLOC_ARRAY(language_tags, num_langs);
1071 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1072 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1073 break;
1074 }
1075 } while (*s++);
1076
1077 /* write Accept-Language header into buf */
1078 if (num_langs) {
1079 int last_buf_len = 0;
1080 int max_q;
1081 int decimal_places;
1082 char q_format[32];
1083
1084 /* add '*' */
1085 REALLOC_ARRAY(language_tags, num_langs + 1);
1086 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1087
1088 /* compute decimal_places */
1089 for (max_q = 1, decimal_places = 0;
1090 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1091 decimal_places++, max_q *= 10)
1092 ;
1093
1094 sprintf(q_format, ";q=0.%%0%dd", decimal_places);
1095
1096 strbuf_addstr(buf, "Accept-Language: ");
1097
1098 for (i = 0; i < num_langs; i++) {
1099 if (i > 0)
1100 strbuf_addstr(buf, ", ");
1101
1102 strbuf_addstr(buf, language_tags[i]);
1103
1104 if (i > 0)
1105 strbuf_addf(buf, q_format, max_q - i);
1106
1107 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1108 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1109 break;
1110 }
1111
1112 last_buf_len = buf->len;
1113 }
1114 }
1115
1116 /* free language tags -- last one is a static '*' */
1117 for (i = 0; i < num_langs - 1; i++)
1118 free(language_tags[i]);
1119 free(language_tags);
1120 }
1121
1122 /*
1123 * Get an Accept-Language header which indicates user's preferred languages.
1124 *
1125 * Examples:
1126 * LANGUAGE= -> ""
1127 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1128 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1129 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1130 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1131 * LANGUAGE= LANG=C -> ""
1132 */
1133 static const char *get_accept_language(void)
1134 {
1135 if (!cached_accept_language) {
1136 struct strbuf buf = STRBUF_INIT;
1137 write_accept_language(&buf);
1138 if (buf.len > 0)
1139 cached_accept_language = strbuf_detach(&buf, NULL);
1140 }
1141
1142 return cached_accept_language;
1143 }
1144
1145 /* http_request() targets */
1146 #define HTTP_REQUEST_STRBUF 0
1147 #define HTTP_REQUEST_FILE 1
1148
1149 static int http_request(const char *url,
1150 void *result, int target,
1151 const struct http_get_options *options)
1152 {
1153 struct active_request_slot *slot;
1154 struct slot_results results;
1155 struct curl_slist *headers = NULL;
1156 struct strbuf buf = STRBUF_INIT;
1157 const char *accept_language;
1158 int ret;
1159
1160 slot = get_active_slot();
1161 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1162
1163 if (result == NULL) {
1164 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1165 } else {
1166 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1167 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1168
1169 if (target == HTTP_REQUEST_FILE) {
1170 long posn = ftell(result);
1171 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1172 fwrite);
1173 if (posn > 0) {
1174 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1175 headers = curl_slist_append(headers, buf.buf);
1176 strbuf_reset(&buf);
1177 }
1178 } else
1179 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1180 fwrite_buffer);
1181 }
1182
1183 accept_language = get_accept_language();
1184
1185 if (accept_language)
1186 headers = curl_slist_append(headers, accept_language);
1187
1188 strbuf_addstr(&buf, "Pragma:");
1189 if (options && options->no_cache)
1190 strbuf_addstr(&buf, " no-cache");
1191 if (options && options->keep_error)
1192 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1193
1194 headers = curl_slist_append(headers, buf.buf);
1195
1196 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1197 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1198 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1199
1200 ret = run_one_slot(slot, &results);
1201
1202 if (options && options->content_type) {
1203 struct strbuf raw = STRBUF_INIT;
1204 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1205 extract_content_type(&raw, options->content_type,
1206 options->charset);
1207 strbuf_release(&raw);
1208 }
1209
1210 if (options && options->effective_url)
1211 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1212 options->effective_url);
1213
1214 curl_slist_free_all(headers);
1215 strbuf_release(&buf);
1216
1217 return ret;
1218 }
1219
1220 /*
1221 * Update the "base" url to a more appropriate value, as deduced by
1222 * redirects seen when requesting a URL starting with "url".
1223 *
1224 * The "asked" parameter is a URL that we asked curl to access, and must begin
1225 * with "base".
1226 *
1227 * The "got" parameter is the URL that curl reported to us as where we ended
1228 * up.
1229 *
1230 * Returns 1 if we updated the base url, 0 otherwise.
1231 *
1232 * Our basic strategy is to compare "base" and "asked" to find the bits
1233 * specific to our request. We then strip those bits off of "got" to yield the
1234 * new base. So for example, if our base is "http://example.com/foo.git",
1235 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1236 * with "https://other.example.com/foo.git/info/refs". We would want the
1237 * new URL to become "https://other.example.com/foo.git".
1238 *
1239 * Note that this assumes a sane redirect scheme. It's entirely possible
1240 * in the example above to end up at a URL that does not even end in
1241 * "info/refs". In such a case we simply punt, as there is not much we can
1242 * do (and such a scheme is unlikely to represent a real git repository,
1243 * which means we are likely about to abort anyway).
1244 */
1245 static int update_url_from_redirect(struct strbuf *base,
1246 const char *asked,
1247 const struct strbuf *got)
1248 {
1249 const char *tail;
1250 size_t tail_len;
1251
1252 if (!strcmp(asked, got->buf))
1253 return 0;
1254
1255 if (!skip_prefix(asked, base->buf, &tail))
1256 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1257 asked, base->buf);
1258
1259 tail_len = strlen(tail);
1260
1261 if (got->len < tail_len ||
1262 strcmp(tail, got->buf + got->len - tail_len))
1263 return 0; /* insane redirect scheme */
1264
1265 strbuf_reset(base);
1266 strbuf_add(base, got->buf, got->len - tail_len);
1267 return 1;
1268 }
1269
1270 static int http_request_reauth(const char *url,
1271 void *result, int target,
1272 struct http_get_options *options)
1273 {
1274 int ret = http_request(url, result, target, options);
1275
1276 if (options && options->effective_url && options->base_url) {
1277 if (update_url_from_redirect(options->base_url,
1278 url, options->effective_url)) {
1279 credential_from_url(&http_auth, options->base_url->buf);
1280 url = options->effective_url->buf;
1281 }
1282 }
1283
1284 if (ret != HTTP_REAUTH)
1285 return ret;
1286
1287 /*
1288 * If we are using KEEP_ERROR, the previous request may have
1289 * put cruft into our output stream; we should clear it out before
1290 * making our next request. We only know how to do this for
1291 * the strbuf case, but that is enough to satisfy current callers.
1292 */
1293 if (options && options->keep_error) {
1294 switch (target) {
1295 case HTTP_REQUEST_STRBUF:
1296 strbuf_reset(result);
1297 break;
1298 default:
1299 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1300 }
1301 }
1302
1303 credential_fill(&http_auth);
1304
1305 return http_request(url, result, target, options);
1306 }
1307
1308 int http_get_strbuf(const char *url,
1309 struct strbuf *result,
1310 struct http_get_options *options)
1311 {
1312 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1313 }
1314
1315 /*
1316 * Downloads a URL and stores the result in the given file.
1317 *
1318 * If a previous interrupted download is detected (i.e. a previous temporary
1319 * file is still around) the download is resumed.
1320 */
1321 static int http_get_file(const char *url, const char *filename,
1322 struct http_get_options *options)
1323 {
1324 int ret;
1325 struct strbuf tmpfile = STRBUF_INIT;
1326 FILE *result;
1327
1328 strbuf_addf(&tmpfile, "%s.temp", filename);
1329 result = fopen(tmpfile.buf, "a");
1330 if (!result) {
1331 error("Unable to open local file %s", tmpfile.buf);
1332 ret = HTTP_ERROR;
1333 goto cleanup;
1334 }
1335
1336 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1337 fclose(result);
1338
1339 if (ret == HTTP_OK && move_temp_to_file(tmpfile.buf, filename))
1340 ret = HTTP_ERROR;
1341 cleanup:
1342 strbuf_release(&tmpfile);
1343 return ret;
1344 }
1345
1346 int http_fetch_ref(const char *base, struct ref *ref)
1347 {
1348 struct http_get_options options = {0};
1349 char *url;
1350 struct strbuf buffer = STRBUF_INIT;
1351 int ret = -1;
1352
1353 options.no_cache = 1;
1354
1355 url = quote_ref_url(base, ref->name);
1356 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1357 strbuf_rtrim(&buffer);
1358 if (buffer.len == 40)
1359 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1360 else if (starts_with(buffer.buf, "ref: ")) {
1361 ref->symref = xstrdup(buffer.buf + 5);
1362 ret = 0;
1363 }
1364 }
1365
1366 strbuf_release(&buffer);
1367 free(url);
1368 return ret;
1369 }
1370
1371 /* Helpers for fetching packs */
1372 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1373 {
1374 char *url, *tmp;
1375 struct strbuf buf = STRBUF_INIT;
1376
1377 if (http_is_verbose)
1378 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1379
1380 end_url_with_slash(&buf, base_url);
1381 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1382 url = strbuf_detach(&buf, NULL);
1383
1384 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1385 tmp = strbuf_detach(&buf, NULL);
1386
1387 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1388 error("Unable to get pack index %s", url);
1389 free(tmp);
1390 tmp = NULL;
1391 }
1392
1393 free(url);
1394 return tmp;
1395 }
1396
1397 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1398 unsigned char *sha1, const char *base_url)
1399 {
1400 struct packed_git *new_pack;
1401 char *tmp_idx = NULL;
1402 int ret;
1403
1404 if (has_pack_index(sha1)) {
1405 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1406 if (!new_pack)
1407 return -1; /* parse_pack_index() already issued error message */
1408 goto add_pack;
1409 }
1410
1411 tmp_idx = fetch_pack_index(sha1, base_url);
1412 if (!tmp_idx)
1413 return -1;
1414
1415 new_pack = parse_pack_index(sha1, tmp_idx);
1416 if (!new_pack) {
1417 unlink(tmp_idx);
1418 free(tmp_idx);
1419
1420 return -1; /* parse_pack_index() already issued error message */
1421 }
1422
1423 ret = verify_pack_index(new_pack);
1424 if (!ret) {
1425 close_pack_index(new_pack);
1426 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1427 }
1428 free(tmp_idx);
1429 if (ret)
1430 return -1;
1431
1432 add_pack:
1433 new_pack->next = *packs_head;
1434 *packs_head = new_pack;
1435 return 0;
1436 }
1437
1438 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1439 {
1440 struct http_get_options options = {0};
1441 int ret = 0, i = 0;
1442 char *url, *data;
1443 struct strbuf buf = STRBUF_INIT;
1444 unsigned char sha1[20];
1445
1446 end_url_with_slash(&buf, base_url);
1447 strbuf_addstr(&buf, "objects/info/packs");
1448 url = strbuf_detach(&buf, NULL);
1449
1450 options.no_cache = 1;
1451 ret = http_get_strbuf(url, &buf, &options);
1452 if (ret != HTTP_OK)
1453 goto cleanup;
1454
1455 data = buf.buf;
1456 while (i < buf.len) {
1457 switch (data[i]) {
1458 case 'P':
1459 i++;
1460 if (i + 52 <= buf.len &&
1461 starts_with(data + i, " pack-") &&
1462 starts_with(data + i + 46, ".pack\n")) {
1463 get_sha1_hex(data + i + 6, sha1);
1464 fetch_and_setup_pack_index(packs_head, sha1,
1465 base_url);
1466 i += 51;
1467 break;
1468 }
1469 default:
1470 while (i < buf.len && data[i] != '\n')
1471 i++;
1472 }
1473 i++;
1474 }
1475
1476 cleanup:
1477 free(url);
1478 return ret;
1479 }
1480
1481 void release_http_pack_request(struct http_pack_request *preq)
1482 {
1483 if (preq->packfile != NULL) {
1484 fclose(preq->packfile);
1485 preq->packfile = NULL;
1486 }
1487 if (preq->range_header != NULL) {
1488 curl_slist_free_all(preq->range_header);
1489 preq->range_header = NULL;
1490 }
1491 preq->slot = NULL;
1492 free(preq->url);
1493 free(preq);
1494 }
1495
1496 int finish_http_pack_request(struct http_pack_request *preq)
1497 {
1498 struct packed_git **lst;
1499 struct packed_git *p = preq->target;
1500 char *tmp_idx;
1501 struct child_process ip = CHILD_PROCESS_INIT;
1502 const char *ip_argv[8];
1503
1504 close_pack_index(p);
1505
1506 fclose(preq->packfile);
1507 preq->packfile = NULL;
1508
1509 lst = preq->lst;
1510 while (*lst != p)
1511 lst = &((*lst)->next);
1512 *lst = (*lst)->next;
1513
1514 tmp_idx = xstrdup(preq->tmpfile);
1515 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1516 ".idx.temp");
1517
1518 ip_argv[0] = "index-pack";
1519 ip_argv[1] = "-o";
1520 ip_argv[2] = tmp_idx;
1521 ip_argv[3] = preq->tmpfile;
1522 ip_argv[4] = NULL;
1523
1524 ip.argv = ip_argv;
1525 ip.git_cmd = 1;
1526 ip.no_stdin = 1;
1527 ip.no_stdout = 1;
1528
1529 if (run_command(&ip)) {
1530 unlink(preq->tmpfile);
1531 unlink(tmp_idx);
1532 free(tmp_idx);
1533 return -1;
1534 }
1535
1536 unlink(sha1_pack_index_name(p->sha1));
1537
1538 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1539 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1540 free(tmp_idx);
1541 return -1;
1542 }
1543
1544 install_packed_git(p);
1545 free(tmp_idx);
1546 return 0;
1547 }
1548
1549 struct http_pack_request *new_http_pack_request(
1550 struct packed_git *target, const char *base_url)
1551 {
1552 long prev_posn = 0;
1553 char range[RANGE_HEADER_SIZE];
1554 struct strbuf buf = STRBUF_INIT;
1555 struct http_pack_request *preq;
1556
1557 preq = xcalloc(1, sizeof(*preq));
1558 preq->target = target;
1559
1560 end_url_with_slash(&buf, base_url);
1561 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1562 sha1_to_hex(target->sha1));
1563 preq->url = strbuf_detach(&buf, NULL);
1564
1565 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1566 sha1_pack_name(target->sha1));
1567 preq->packfile = fopen(preq->tmpfile, "a");
1568 if (!preq->packfile) {
1569 error("Unable to open local file %s for pack",
1570 preq->tmpfile);
1571 goto abort;
1572 }
1573
1574 preq->slot = get_active_slot();
1575 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1576 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1577 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1578 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1579 no_pragma_header);
1580
1581 /*
1582 * If there is data present from a previous transfer attempt,
1583 * resume where it left off
1584 */
1585 prev_posn = ftell(preq->packfile);
1586 if (prev_posn>0) {
1587 if (http_is_verbose)
1588 fprintf(stderr,
1589 "Resuming fetch of pack %s at byte %ld\n",
1590 sha1_to_hex(target->sha1), prev_posn);
1591 sprintf(range, "Range: bytes=%ld-", prev_posn);
1592 preq->range_header = curl_slist_append(NULL, range);
1593 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1594 preq->range_header);
1595 }
1596
1597 return preq;
1598
1599 abort:
1600 free(preq->url);
1601 free(preq);
1602 return NULL;
1603 }
1604
1605 /* Helpers for fetching objects (loose) */
1606 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1607 void *data)
1608 {
1609 unsigned char expn[4096];
1610 size_t size = eltsize * nmemb;
1611 int posn = 0;
1612 struct http_object_request *freq =
1613 (struct http_object_request *)data;
1614 do {
1615 ssize_t retval = xwrite(freq->localfile,
1616 (char *) ptr + posn, size - posn);
1617 if (retval < 0)
1618 return posn;
1619 posn += retval;
1620 } while (posn < size);
1621
1622 freq->stream.avail_in = size;
1623 freq->stream.next_in = (void *)ptr;
1624 do {
1625 freq->stream.next_out = expn;
1626 freq->stream.avail_out = sizeof(expn);
1627 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1628 git_SHA1_Update(&freq->c, expn,
1629 sizeof(expn) - freq->stream.avail_out);
1630 } while (freq->stream.avail_in && freq->zret == Z_OK);
1631 return size;
1632 }
1633
1634 struct http_object_request *new_http_object_request(const char *base_url,
1635 unsigned char *sha1)
1636 {
1637 char *hex = sha1_to_hex(sha1);
1638 const char *filename;
1639 char prevfile[PATH_MAX];
1640 int prevlocal;
1641 char prev_buf[PREV_BUF_SIZE];
1642 ssize_t prev_read = 0;
1643 long prev_posn = 0;
1644 char range[RANGE_HEADER_SIZE];
1645 struct curl_slist *range_header = NULL;
1646 struct http_object_request *freq;
1647
1648 freq = xcalloc(1, sizeof(*freq));
1649 hashcpy(freq->sha1, sha1);
1650 freq->localfile = -1;
1651
1652 filename = sha1_file_name(sha1);
1653 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1654 "%s.temp", filename);
1655
1656 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1657 unlink_or_warn(prevfile);
1658 rename(freq->tmpfile, prevfile);
1659 unlink_or_warn(freq->tmpfile);
1660
1661 if (freq->localfile != -1)
1662 error("fd leakage in start: %d", freq->localfile);
1663 freq->localfile = open(freq->tmpfile,
1664 O_WRONLY | O_CREAT | O_EXCL, 0666);
1665 /*
1666 * This could have failed due to the "lazy directory creation";
1667 * try to mkdir the last path component.
1668 */
1669 if (freq->localfile < 0 && errno == ENOENT) {
1670 char *dir = strrchr(freq->tmpfile, '/');
1671 if (dir) {
1672 *dir = 0;
1673 mkdir(freq->tmpfile, 0777);
1674 *dir = '/';
1675 }
1676 freq->localfile = open(freq->tmpfile,
1677 O_WRONLY | O_CREAT | O_EXCL, 0666);
1678 }
1679
1680 if (freq->localfile < 0) {
1681 error("Couldn't create temporary file %s: %s",
1682 freq->tmpfile, strerror(errno));
1683 goto abort;
1684 }
1685
1686 git_inflate_init(&freq->stream);
1687
1688 git_SHA1_Init(&freq->c);
1689
1690 freq->url = get_remote_object_url(base_url, hex, 0);
1691
1692 /*
1693 * If a previous temp file is present, process what was already
1694 * fetched.
1695 */
1696 prevlocal = open(prevfile, O_RDONLY);
1697 if (prevlocal != -1) {
1698 do {
1699 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1700 if (prev_read>0) {
1701 if (fwrite_sha1_file(prev_buf,
1702 1,
1703 prev_read,
1704 freq) == prev_read) {
1705 prev_posn += prev_read;
1706 } else {
1707 prev_read = -1;
1708 }
1709 }
1710 } while (prev_read > 0);
1711 close(prevlocal);
1712 }
1713 unlink_or_warn(prevfile);
1714
1715 /*
1716 * Reset inflate/SHA1 if there was an error reading the previous temp
1717 * file; also rewind to the beginning of the local file.
1718 */
1719 if (prev_read == -1) {
1720 memset(&freq->stream, 0, sizeof(freq->stream));
1721 git_inflate_init(&freq->stream);
1722 git_SHA1_Init(&freq->c);
1723 if (prev_posn>0) {
1724 prev_posn = 0;
1725 lseek(freq->localfile, 0, SEEK_SET);
1726 if (ftruncate(freq->localfile, 0) < 0) {
1727 error("Couldn't truncate temporary file %s: %s",
1728 freq->tmpfile, strerror(errno));
1729 goto abort;
1730 }
1731 }
1732 }
1733
1734 freq->slot = get_active_slot();
1735
1736 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1737 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1738 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1739 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1740 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1741
1742 /*
1743 * If we have successfully processed data from a previous fetch
1744 * attempt, only fetch the data we don't already have.
1745 */
1746 if (prev_posn>0) {
1747 if (http_is_verbose)
1748 fprintf(stderr,
1749 "Resuming fetch of object %s at byte %ld\n",
1750 hex, prev_posn);
1751 sprintf(range, "Range: bytes=%ld-", prev_posn);
1752 range_header = curl_slist_append(range_header, range);
1753 curl_easy_setopt(freq->slot->curl,
1754 CURLOPT_HTTPHEADER, range_header);
1755 }
1756
1757 return freq;
1758
1759 abort:
1760 free(freq->url);
1761 free(freq);
1762 return NULL;
1763 }
1764
1765 void process_http_object_request(struct http_object_request *freq)
1766 {
1767 if (freq->slot == NULL)
1768 return;
1769 freq->curl_result = freq->slot->curl_result;
1770 freq->http_code = freq->slot->http_code;
1771 freq->slot = NULL;
1772 }
1773
1774 int finish_http_object_request(struct http_object_request *freq)
1775 {
1776 struct stat st;
1777
1778 close(freq->localfile);
1779 freq->localfile = -1;
1780
1781 process_http_object_request(freq);
1782
1783 if (freq->http_code == 416) {
1784 warning("requested range invalid; we may already have all the data.");
1785 } else if (freq->curl_result != CURLE_OK) {
1786 if (stat(freq->tmpfile, &st) == 0)
1787 if (st.st_size == 0)
1788 unlink_or_warn(freq->tmpfile);
1789 return -1;
1790 }
1791
1792 git_inflate_end(&freq->stream);
1793 git_SHA1_Final(freq->real_sha1, &freq->c);
1794 if (freq->zret != Z_STREAM_END) {
1795 unlink_or_warn(freq->tmpfile);
1796 return -1;
1797 }
1798 if (hashcmp(freq->sha1, freq->real_sha1)) {
1799 unlink_or_warn(freq->tmpfile);
1800 return -1;
1801 }
1802 freq->rename =
1803 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1804
1805 return freq->rename;
1806 }
1807
1808 void abort_http_object_request(struct http_object_request *freq)
1809 {
1810 unlink_or_warn(freq->tmpfile);
1811
1812 release_http_object_request(freq);
1813 }
1814
1815 void release_http_object_request(struct http_object_request *freq)
1816 {
1817 if (freq->localfile != -1) {
1818 close(freq->localfile);
1819 freq->localfile = -1;
1820 }
1821 if (freq->url != NULL) {
1822 free(freq->url);
1823 freq->url = NULL;
1824 }
1825 if (freq->slot != NULL) {
1826 freq->slot->callback_func = NULL;
1827 freq->slot->callback_data = NULL;
1828 release_active_slot(freq->slot);
1829 freq->slot = NULL;
1830 }
1831 }
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