?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
http: always remove curl easy from curlm session on release
[git.git] / http.c
blob6a97783d0a43707abfc60e114d4eee8efae9e692
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 static const char *ssl_version;
42 static struct {
43 const char *name;
44 long ssl_version;
45 } sslversions[] = {
46 { "sslv2", CURL_SSLVERSION_SSLv2 },
47 { "sslv3", CURL_SSLVERSION_SSLv3 },
48 { "tlsv1", CURL_SSLVERSION_TLSv1 },
49 #if LIBCURL_VERSION_NUM >= 0x072200
50 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
51 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
52 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
53 #endif
54 };
55 #if LIBCURL_VERSION_NUM >= 0x070903
56 static const char *ssl_key;
57 #endif
58 #if LIBCURL_VERSION_NUM >= 0x070908
59 static const char *ssl_capath;
60 #endif
61 static const char *ssl_cainfo;
62 static long curl_low_speed_limit = -1;
63 static long curl_low_speed_time = -1;
64 static int curl_ftp_no_epsv;
65 static const char *curl_http_proxy;
66 static const char *curl_cookie_file;
67 static int curl_save_cookies;
68 struct credential http_auth = CREDENTIAL_INIT;
69 static int http_proactive_auth;
70 static const char *user_agent;
71
72 #if LIBCURL_VERSION_NUM >= 0x071700
73 /* Use CURLOPT_KEYPASSWD as is */
74 #elif LIBCURL_VERSION_NUM >= 0x070903
75 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
76 #else
77 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
78 #endif
79
80 static struct credential cert_auth = CREDENTIAL_INIT;
81 static int ssl_cert_password_required;
82 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
83 static unsigned long http_auth_methods = CURLAUTH_ANY;
84 #endif
85
86 static struct curl_slist *pragma_header;
87 static struct curl_slist *no_pragma_header;
88
89 static struct active_request_slot *active_queue_head;
90
91 static char *cached_accept_language;
92
93 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
94 {
95 size_t size = eltsize * nmemb;
96 struct buffer *buffer = buffer_;
97
98 if (size > buffer->buf.len - buffer->posn)
99 size = buffer->buf.len - buffer->posn;
100 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
101 buffer->posn += size;
102
103 return size;
104 }
105
106 #ifndef NO_CURL_IOCTL
107 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
108 {
109 struct buffer *buffer = clientp;
110
111 switch (cmd) {
112 case CURLIOCMD_NOP:
113 return CURLIOE_OK;
114
115 case CURLIOCMD_RESTARTREAD:
116 buffer->posn = 0;
117 return CURLIOE_OK;
118
119 default:
120 return CURLIOE_UNKNOWNCMD;
121 }
122 }
123 #endif
124
125 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
126 {
127 size_t size = eltsize * nmemb;
128 struct strbuf *buffer = buffer_;
129
130 strbuf_add(buffer, ptr, size);
131 return size;
132 }
133
134 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
135 {
136 return eltsize * nmemb;
137 }
138
139 static void closedown_active_slot(struct active_request_slot *slot)
140 {
141 active_requests--;
142 slot->in_use = 0;
143 }
144
145 static void finish_active_slot(struct active_request_slot *slot)
146 {
147 closedown_active_slot(slot);
148 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
149
150 if (slot->finished != NULL)
151 (*slot->finished) = 1;
152
153 /* Store slot results so they can be read after the slot is reused */
154 if (slot->results != NULL) {
155 slot->results->curl_result = slot->curl_result;
156 slot->results->http_code = slot->http_code;
157 #if LIBCURL_VERSION_NUM >= 0x070a08
158 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
159 &slot->results->auth_avail);
160 #else
161 slot->results->auth_avail = 0;
162 #endif
163 }
164
165 /* Run callback if appropriate */
166 if (slot->callback_func != NULL)
167 slot->callback_func(slot->callback_data);
168 }
169
170 static void xmulti_remove_handle(struct active_request_slot *slot)
171 {
172 #ifdef USE_CURL_MULTI
173 curl_multi_remove_handle(curlm, slot->curl);
174 #endif
175 }
176
177 #ifdef USE_CURL_MULTI
178 static void process_curl_messages(void)
179 {
180 int num_messages;
181 struct active_request_slot *slot;
182 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
183
184 while (curl_message != NULL) {
185 if (curl_message->msg == CURLMSG_DONE) {
186 int curl_result = curl_message->data.result;
187 slot = active_queue_head;
188 while (slot != NULL &&
189 slot->curl != curl_message->easy_handle)
190 slot = slot->next;
191 if (slot != NULL) {
192 xmulti_remove_handle(slot);
193 slot->curl_result = curl_result;
194 finish_active_slot(slot);
195 } else {
196 fprintf(stderr, "Received DONE message for unknown request!\n");
197 }
198 } else {
199 fprintf(stderr, "Unknown CURL message received: %d\n",
200 (int)curl_message->msg);
201 }
202 curl_message = curl_multi_info_read(curlm, &num_messages);
203 }
204 }
205 #endif
206
207 static int http_options(const char *var, const char *value, void *cb)
208 {
209 if (!strcmp("http.sslverify", var)) {
210 curl_ssl_verify = git_config_bool(var, value);
211 return 0;
212 }
213 if (!strcmp("http.sslcipherlist", var))
214 return git_config_string(&ssl_cipherlist, var, value);
215 if (!strcmp("http.sslversion", var))
216 return git_config_string(&ssl_version, var, value);
217 if (!strcmp("http.sslcert", var))
218 return git_config_string(&ssl_cert, var, value);
219 #if LIBCURL_VERSION_NUM >= 0x070903
220 if (!strcmp("http.sslkey", var))
221 return git_config_string(&ssl_key, var, value);
222 #endif
223 #if LIBCURL_VERSION_NUM >= 0x070908
224 if (!strcmp("http.sslcapath", var))
225 return git_config_pathname(&ssl_capath, var, value);
226 #endif
227 if (!strcmp("http.sslcainfo", var))
228 return git_config_pathname(&ssl_cainfo, var, value);
229 if (!strcmp("http.sslcertpasswordprotected", var)) {
230 ssl_cert_password_required = git_config_bool(var, value);
231 return 0;
232 }
233 if (!strcmp("http.ssltry", var)) {
234 curl_ssl_try = git_config_bool(var, value);
235 return 0;
236 }
237 if (!strcmp("http.minsessions", var)) {
238 min_curl_sessions = git_config_int(var, value);
239 #ifndef USE_CURL_MULTI
240 if (min_curl_sessions > 1)
241 min_curl_sessions = 1;
242 #endif
243 return 0;
244 }
245 #ifdef USE_CURL_MULTI
246 if (!strcmp("http.maxrequests", var)) {
247 max_requests = git_config_int(var, value);
248 return 0;
249 }
250 #endif
251 if (!strcmp("http.lowspeedlimit", var)) {
252 curl_low_speed_limit = (long)git_config_int(var, value);
253 return 0;
254 }
255 if (!strcmp("http.lowspeedtime", var)) {
256 curl_low_speed_time = (long)git_config_int(var, value);
257 return 0;
258 }
259
260 if (!strcmp("http.noepsv", var)) {
261 curl_ftp_no_epsv = git_config_bool(var, value);
262 return 0;
263 }
264 if (!strcmp("http.proxy", var))
265 return git_config_string(&curl_http_proxy, var, value);
266
267 if (!strcmp("http.cookiefile", var))
268 return git_config_string(&curl_cookie_file, var, value);
269 if (!strcmp("http.savecookies", var)) {
270 curl_save_cookies = git_config_bool(var, value);
271 return 0;
272 }
273
274 if (!strcmp("http.postbuffer", var)) {
275 http_post_buffer = git_config_int(var, value);
276 if (http_post_buffer < LARGE_PACKET_MAX)
277 http_post_buffer = LARGE_PACKET_MAX;
278 return 0;
279 }
280
281 if (!strcmp("http.useragent", var))
282 return git_config_string(&user_agent, var, value);
283
284 /* Fall back on the default ones */
285 return git_default_config(var, value, cb);
286 }
287
288 static void init_curl_http_auth(CURL *result)
289 {
290 if (!http_auth.username)
291 return;
292
293 credential_fill(&http_auth);
294
295 #if LIBCURL_VERSION_NUM >= 0x071301
296 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
297 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
298 #else
299 {
300 static struct strbuf up = STRBUF_INIT;
301 /*
302 * Note that we assume we only ever have a single set of
303 * credentials in a given program run, so we do not have
304 * to worry about updating this buffer, only setting its
305 * initial value.
306 */
307 if (!up.len)
308 strbuf_addf(&up, "%s:%s",
309 http_auth.username, http_auth.password);
310 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
311 }
312 #endif
313 }
314
315 static int has_cert_password(void)
316 {
317 if (ssl_cert == NULL || ssl_cert_password_required != 1)
318 return 0;
319 if (!cert_auth.password) {
320 cert_auth.protocol = xstrdup("cert");
321 cert_auth.username = xstrdup("");
322 cert_auth.path = xstrdup(ssl_cert);
323 credential_fill(&cert_auth);
324 }
325 return 1;
326 }
327
328 #if LIBCURL_VERSION_NUM >= 0x071900
329 static void set_curl_keepalive(CURL *c)
330 {
331 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
332 }
333
334 #elif LIBCURL_VERSION_NUM >= 0x071000
335 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
336 {
337 int ka = 1;
338 int rc;
339 socklen_t len = (socklen_t)sizeof(ka);
340
341 if (type != CURLSOCKTYPE_IPCXN)
342 return 0;
343
344 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
345 if (rc < 0)
346 warning("unable to set SO_KEEPALIVE on socket %s",
347 strerror(errno));
348
349 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
350 }
351
352 static void set_curl_keepalive(CURL *c)
353 {
354 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
355 }
356
357 #else
358 static void set_curl_keepalive(CURL *c)
359 {
360 /* not supported on older curl versions */
361 }
362 #endif
363
364 static CURL *get_curl_handle(void)
365 {
366 CURL *result = curl_easy_init();
367 long allowed_protocols = 0;
368
369 if (!result)
370 die("curl_easy_init failed");
371
372 if (!curl_ssl_verify) {
373 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
374 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
375 } else {
376 /* Verify authenticity of the peer's certificate */
377 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
378 /* The name in the cert must match whom we tried to connect */
379 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
380 }
381
382 #if LIBCURL_VERSION_NUM >= 0x070907
383 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
384 #endif
385 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
386 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
387 #endif
388
389 if (http_proactive_auth)
390 init_curl_http_auth(result);
391
392 if (getenv("GIT_SSL_VERSION"))
393 ssl_version = getenv("GIT_SSL_VERSION");
394 if (ssl_version && *ssl_version) {
395 int i;
396 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
397 if (!strcmp(ssl_version, sslversions[i].name)) {
398 curl_easy_setopt(result, CURLOPT_SSLVERSION,
399 sslversions[i].ssl_version);
400 break;
401 }
402 }
403 if (i == ARRAY_SIZE(sslversions))
404 warning("unsupported ssl version %s: using default",
405 ssl_version);
406 }
407
408 if (getenv("GIT_SSL_CIPHER_LIST"))
409 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
410 if (ssl_cipherlist != NULL && *ssl_cipherlist)
411 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
412 ssl_cipherlist);
413
414 if (ssl_cert != NULL)
415 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
416 if (has_cert_password())
417 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
418 #if LIBCURL_VERSION_NUM >= 0x070903
419 if (ssl_key != NULL)
420 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
421 #endif
422 #if LIBCURL_VERSION_NUM >= 0x070908
423 if (ssl_capath != NULL)
424 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
425 #endif
426 if (ssl_cainfo != NULL)
427 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
428
429 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
430 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
431 curl_low_speed_limit);
432 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
433 curl_low_speed_time);
434 }
435
436 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
437 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
438 #if LIBCURL_VERSION_NUM >= 0x071301
439 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
440 #elif LIBCURL_VERSION_NUM >= 0x071101
441 curl_easy_setopt(result, CURLOPT_POST301, 1);
442 #endif
443 #if LIBCURL_VERSION_NUM >= 0x071304
444 if (is_transport_allowed("http"))
445 allowed_protocols |= CURLPROTO_HTTP;
446 if (is_transport_allowed("https"))
447 allowed_protocols |= CURLPROTO_HTTPS;
448 if (is_transport_allowed("ftp"))
449 allowed_protocols |= CURLPROTO_FTP;
450 if (is_transport_allowed("ftps"))
451 allowed_protocols |= CURLPROTO_FTPS;
452 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
453 #else
454 if (transport_restrict_protocols())
455 warning("protocol restrictions not applied to curl redirects because\n"
456 "your curl version is too old (>= 7.19.4)");
457 #endif
458
459 if (getenv("GIT_CURL_VERBOSE"))
460 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
461
462 curl_easy_setopt(result, CURLOPT_USERAGENT,
463 user_agent ? user_agent : git_user_agent());
464
465 if (curl_ftp_no_epsv)
466 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
467
468 #ifdef CURLOPT_USE_SSL
469 if (curl_ssl_try)
470 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
471 #endif
472
473 if (curl_http_proxy) {
474 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
475 #if LIBCURL_VERSION_NUM >= 0x071800
476 if (starts_with(curl_http_proxy, "socks5"))
477 curl_easy_setopt(result,
478 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
479 else if (starts_with(curl_http_proxy, "socks4a"))
480 curl_easy_setopt(result,
481 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
482 else if (starts_with(curl_http_proxy, "socks"))
483 curl_easy_setopt(result,
484 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
485 #endif
486 }
487 #if LIBCURL_VERSION_NUM >= 0x070a07
488 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
489 #endif
490
491 set_curl_keepalive(result);
492
493 return result;
494 }
495
496 static void set_from_env(const char **var, const char *envname)
497 {
498 const char *val = getenv(envname);
499 if (val)
500 *var = val;
501 }
502
503 void http_init(struct remote *remote, const char *url, int proactive_auth)
504 {
505 char *low_speed_limit;
506 char *low_speed_time;
507 char *normalized_url;
508 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
509
510 config.section = "http";
511 config.key = NULL;
512 config.collect_fn = http_options;
513 config.cascade_fn = git_default_config;
514 config.cb = NULL;
515
516 http_is_verbose = 0;
517 normalized_url = url_normalize(url, &config.url);
518
519 git_config(urlmatch_config_entry, &config);
520 free(normalized_url);
521
522 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
523 die("curl_global_init failed");
524
525 http_proactive_auth = proactive_auth;
526
527 if (remote && remote->http_proxy)
528 curl_http_proxy = xstrdup(remote->http_proxy);
529
530 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
531 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
532
533 #ifdef USE_CURL_MULTI
534 {
535 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
536 if (http_max_requests != NULL)
537 max_requests = atoi(http_max_requests);
538 }
539
540 curlm = curl_multi_init();
541 if (!curlm)
542 die("curl_multi_init failed");
543 #endif
544
545 if (getenv("GIT_SSL_NO_VERIFY"))
546 curl_ssl_verify = 0;
547
548 set_from_env(&ssl_cert, "GIT_SSL_CERT");
549 #if LIBCURL_VERSION_NUM >= 0x070903
550 set_from_env(&ssl_key, "GIT_SSL_KEY");
551 #endif
552 #if LIBCURL_VERSION_NUM >= 0x070908
553 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
554 #endif
555 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
556
557 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
558
559 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
560 if (low_speed_limit != NULL)
561 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
562 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
563 if (low_speed_time != NULL)
564 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
565
566 if (curl_ssl_verify == -1)
567 curl_ssl_verify = 1;
568
569 curl_session_count = 0;
570 #ifdef USE_CURL_MULTI
571 if (max_requests < 1)
572 max_requests = DEFAULT_MAX_REQUESTS;
573 #endif
574
575 if (getenv("GIT_CURL_FTP_NO_EPSV"))
576 curl_ftp_no_epsv = 1;
577
578 if (url) {
579 credential_from_url(&http_auth, url);
580 if (!ssl_cert_password_required &&
581 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
582 starts_with(url, "https://"))
583 ssl_cert_password_required = 1;
584 }
585
586 #ifndef NO_CURL_EASY_DUPHANDLE
587 curl_default = get_curl_handle();
588 #endif
589 }
590
591 void http_cleanup(void)
592 {
593 struct active_request_slot *slot = active_queue_head;
594
595 while (slot != NULL) {
596 struct active_request_slot *next = slot->next;
597 if (slot->curl != NULL) {
598 xmulti_remove_handle(slot);
599 curl_easy_cleanup(slot->curl);
600 }
601 free(slot);
602 slot = next;
603 }
604 active_queue_head = NULL;
605
606 #ifndef NO_CURL_EASY_DUPHANDLE
607 curl_easy_cleanup(curl_default);
608 #endif
609
610 #ifdef USE_CURL_MULTI
611 curl_multi_cleanup(curlm);
612 #endif
613 curl_global_cleanup();
614
615 curl_slist_free_all(pragma_header);
616 pragma_header = NULL;
617
618 curl_slist_free_all(no_pragma_header);
619 no_pragma_header = NULL;
620
621 if (curl_http_proxy) {
622 free((void *)curl_http_proxy);
623 curl_http_proxy = NULL;
624 }
625
626 if (cert_auth.password != NULL) {
627 memset(cert_auth.password, 0, strlen(cert_auth.password));
628 free(cert_auth.password);
629 cert_auth.password = NULL;
630 }
631 ssl_cert_password_required = 0;
632
633 free(cached_accept_language);
634 cached_accept_language = NULL;
635 }
636
637 struct active_request_slot *get_active_slot(void)
638 {
639 struct active_request_slot *slot = active_queue_head;
640 struct active_request_slot *newslot;
641
642 #ifdef USE_CURL_MULTI
643 int num_transfers;
644
645 /* Wait for a slot to open up if the queue is full */
646 while (active_requests >= max_requests) {
647 curl_multi_perform(curlm, &num_transfers);
648 if (num_transfers < active_requests)
649 process_curl_messages();
650 }
651 #endif
652
653 while (slot != NULL && slot->in_use)
654 slot = slot->next;
655
656 if (slot == NULL) {
657 newslot = xmalloc(sizeof(*newslot));
658 newslot->curl = NULL;
659 newslot->in_use = 0;
660 newslot->next = NULL;
661
662 slot = active_queue_head;
663 if (slot == NULL) {
664 active_queue_head = newslot;
665 } else {
666 while (slot->next != NULL)
667 slot = slot->next;
668 slot->next = newslot;
669 }
670 slot = newslot;
671 }
672
673 if (slot->curl == NULL) {
674 #ifdef NO_CURL_EASY_DUPHANDLE
675 slot->curl = get_curl_handle();
676 #else
677 slot->curl = curl_easy_duphandle(curl_default);
678 #endif
679 curl_session_count++;
680 }
681
682 active_requests++;
683 slot->in_use = 1;
684 slot->results = NULL;
685 slot->finished = NULL;
686 slot->callback_data = NULL;
687 slot->callback_func = NULL;
688 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
689 if (curl_save_cookies)
690 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
691 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
692 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
693 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
694 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
695 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
696 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
697 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
698 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
699 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
700 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
701 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
702 #endif
703 if (http_auth.password)
704 init_curl_http_auth(slot->curl);
705
706 return slot;
707 }
708
709 int start_active_slot(struct active_request_slot *slot)
710 {
711 #ifdef USE_CURL_MULTI
712 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
713 int num_transfers;
714
715 if (curlm_result != CURLM_OK &&
716 curlm_result != CURLM_CALL_MULTI_PERFORM) {
717 warning("curl_multi_add_handle failed: %s",
718 curl_multi_strerror(curlm_result));
719 active_requests--;
720 slot->in_use = 0;
721 return 0;
722 }
723
724 /*
725 * We know there must be something to do, since we just added
726 * something.
727 */
728 curl_multi_perform(curlm, &num_transfers);
729 #endif
730 return 1;
731 }
732
733 #ifdef USE_CURL_MULTI
734 struct fill_chain {
735 void *data;
736 int (*fill)(void *);
737 struct fill_chain *next;
738 };
739
740 static struct fill_chain *fill_cfg;
741
742 void add_fill_function(void *data, int (*fill)(void *))
743 {
744 struct fill_chain *new = xmalloc(sizeof(*new));
745 struct fill_chain **linkp = &fill_cfg;
746 new->data = data;
747 new->fill = fill;
748 new->next = NULL;
749 while (*linkp)
750 linkp = &(*linkp)->next;
751 *linkp = new;
752 }
753
754 void fill_active_slots(void)
755 {
756 struct active_request_slot *slot = active_queue_head;
757
758 while (active_requests < max_requests) {
759 struct fill_chain *fill;
760 for (fill = fill_cfg; fill; fill = fill->next)
761 if (fill->fill(fill->data))
762 break;
763
764 if (!fill)
765 break;
766 }
767
768 while (slot != NULL) {
769 if (!slot->in_use && slot->curl != NULL
770 && curl_session_count > min_curl_sessions) {
771 curl_easy_cleanup(slot->curl);
772 slot->curl = NULL;
773 curl_session_count--;
774 }
775 slot = slot->next;
776 }
777 }
778
779 void step_active_slots(void)
780 {
781 int num_transfers;
782 CURLMcode curlm_result;
783
784 do {
785 curlm_result = curl_multi_perform(curlm, &num_transfers);
786 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
787 if (num_transfers < active_requests) {
788 process_curl_messages();
789 fill_active_slots();
790 }
791 }
792 #endif
793
794 void run_active_slot(struct active_request_slot *slot)
795 {
796 #ifdef USE_CURL_MULTI
797 fd_set readfds;
798 fd_set writefds;
799 fd_set excfds;
800 int max_fd;
801 struct timeval select_timeout;
802 int finished = 0;
803
804 slot->finished = &finished;
805 while (!finished) {
806 step_active_slots();
807
808 if (slot->in_use) {
809 #if LIBCURL_VERSION_NUM >= 0x070f04
810 long curl_timeout;
811 curl_multi_timeout(curlm, &curl_timeout);
812 if (curl_timeout == 0) {
813 continue;
814 } else if (curl_timeout == -1) {
815 select_timeout.tv_sec = 0;
816 select_timeout.tv_usec = 50000;
817 } else {
818 select_timeout.tv_sec = curl_timeout / 1000;
819 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
820 }
821 #else
822 select_timeout.tv_sec = 0;
823 select_timeout.tv_usec = 50000;
824 #endif
825
826 max_fd = -1;
827 FD_ZERO(&readfds);
828 FD_ZERO(&writefds);
829 FD_ZERO(&excfds);
830 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
831
832 /*
833 * It can happen that curl_multi_timeout returns a pathologically
834 * long timeout when curl_multi_fdset returns no file descriptors
835 * to read. See commit message for more details.
836 */
837 if (max_fd < 0 &&
838 (select_timeout.tv_sec > 0 ||
839 select_timeout.tv_usec > 50000)) {
840 select_timeout.tv_sec = 0;
841 select_timeout.tv_usec = 50000;
842 }
843
844 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
845 }
846 }
847 #else
848 while (slot->in_use) {
849 slot->curl_result = curl_easy_perform(slot->curl);
850 finish_active_slot(slot);
851 }
852 #endif
853 }
854
855 static void release_active_slot(struct active_request_slot *slot)
856 {
857 closedown_active_slot(slot);
858 if (slot->curl) {
859 xmulti_remove_handle(slot);
860 if (curl_session_count > min_curl_sessions) {
861 curl_easy_cleanup(slot->curl);
862 slot->curl = NULL;
863 curl_session_count--;
864 }
865 }
866 #ifdef USE_CURL_MULTI
867 fill_active_slots();
868 #endif
869 }
870
871 void finish_all_active_slots(void)
872 {
873 struct active_request_slot *slot = active_queue_head;
874
875 while (slot != NULL)
876 if (slot->in_use) {
877 run_active_slot(slot);
878 slot = active_queue_head;
879 } else {
880 slot = slot->next;
881 }
882 }
883
884 /* Helpers for modifying and creating URLs */
885 static inline int needs_quote(int ch)
886 {
887 if (((ch >= 'A') && (ch <= 'Z'))
888 || ((ch >= 'a') && (ch <= 'z'))
889 || ((ch >= '0') && (ch <= '9'))
890 || (ch == '/')
891 || (ch == '-')
892 || (ch == '.'))
893 return 0;
894 return 1;
895 }
896
897 static char *quote_ref_url(const char *base, const char *ref)
898 {
899 struct strbuf buf = STRBUF_INIT;
900 const char *cp;
901 int ch;
902
903 end_url_with_slash(&buf, base);
904
905 for (cp = ref; (ch = *cp) != 0; cp++)
906 if (needs_quote(ch))
907 strbuf_addf(&buf, "%%%02x", ch);
908 else
909 strbuf_addch(&buf, *cp);
910
911 return strbuf_detach(&buf, NULL);
912 }
913
914 void append_remote_object_url(struct strbuf *buf, const char *url,
915 const char *hex,
916 int only_two_digit_prefix)
917 {
918 end_url_with_slash(buf, url);
919
920 strbuf_addf(buf, "objects/%.*s/", 2, hex);
921 if (!only_two_digit_prefix)
922 strbuf_addf(buf, "%s", hex+2);
923 }
924
925 char *get_remote_object_url(const char *url, const char *hex,
926 int only_two_digit_prefix)
927 {
928 struct strbuf buf = STRBUF_INIT;
929 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
930 return strbuf_detach(&buf, NULL);
931 }
932
933 static int handle_curl_result(struct slot_results *results)
934 {
935 /*
936 * If we see a failing http code with CURLE_OK, we have turned off
937 * FAILONERROR (to keep the server's custom error response), and should
938 * translate the code into failure here.
939 */
940 if (results->curl_result == CURLE_OK &&
941 results->http_code >= 400) {
942 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
943 /*
944 * Normally curl will already have put the "reason phrase"
945 * from the server into curl_errorstr; unfortunately without
946 * FAILONERROR it is lost, so we can give only the numeric
947 * status code.
948 */
949 snprintf(curl_errorstr, sizeof(curl_errorstr),
950 "The requested URL returned error: %ld",
951 results->http_code);
952 }
953
954 if (results->curl_result == CURLE_OK) {
955 credential_approve(&http_auth);
956 return HTTP_OK;
957 } else if (missing_target(results))
958 return HTTP_MISSING_TARGET;
959 else if (results->http_code == 401) {
960 if (http_auth.username && http_auth.password) {
961 credential_reject(&http_auth);
962 return HTTP_NOAUTH;
963 } else {
964 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
965 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
966 #endif
967 return HTTP_REAUTH;
968 }
969 } else {
970 #if LIBCURL_VERSION_NUM >= 0x070c00
971 if (!curl_errorstr[0])
972 strlcpy(curl_errorstr,
973 curl_easy_strerror(results->curl_result),
974 sizeof(curl_errorstr));
975 #endif
976 return HTTP_ERROR;
977 }
978 }
979
980 int run_one_slot(struct active_request_slot *slot,
981 struct slot_results *results)
982 {
983 slot->results = results;
984 if (!start_active_slot(slot)) {
985 snprintf(curl_errorstr, sizeof(curl_errorstr),
986 "failed to start HTTP request");
987 return HTTP_START_FAILED;
988 }
989
990 run_active_slot(slot);
991 return handle_curl_result(results);
992 }
993
994 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
995 {
996 char *ptr;
997 CURLcode ret;
998
999 strbuf_reset(buf);
1000 ret = curl_easy_getinfo(curl, info, &ptr);
1001 if (!ret && ptr)
1002 strbuf_addstr(buf, ptr);
1003 return ret;
1004 }
1005
1006 /*
1007 * Check for and extract a content-type parameter. "raw"
1008 * should be positioned at the start of the potential
1009 * parameter, with any whitespace already removed.
1010 *
1011 * "name" is the name of the parameter. The value is appended
1012 * to "out".
1013 */
1014 static int extract_param(const char *raw, const char *name,
1015 struct strbuf *out)
1016 {
1017 size_t len = strlen(name);
1018
1019 if (strncasecmp(raw, name, len))
1020 return -1;
1021 raw += len;
1022
1023 if (*raw != '=')
1024 return -1;
1025 raw++;
1026
1027 while (*raw && !isspace(*raw) && *raw != ';')
1028 strbuf_addch(out, *raw++);
1029 return 0;
1030 }
1031
1032 /*
1033 * Extract a normalized version of the content type, with any
1034 * spaces suppressed, all letters lowercased, and no trailing ";"
1035 * or parameters.
1036 *
1037 * Note that we will silently remove even invalid whitespace. For
1038 * example, "text / plain" is specifically forbidden by RFC 2616,
1039 * but "text/plain" is the only reasonable output, and this keeps
1040 * our code simple.
1041 *
1042 * If the "charset" argument is not NULL, store the value of any
1043 * charset parameter there.
1044 *
1045 * Example:
1046 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1047 * "text / plain" -> "text/plain"
1048 */
1049 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1050 struct strbuf *charset)
1051 {
1052 const char *p;
1053
1054 strbuf_reset(type);
1055 strbuf_grow(type, raw->len);
1056 for (p = raw->buf; *p; p++) {
1057 if (isspace(*p))
1058 continue;
1059 if (*p == ';') {
1060 p++;
1061 break;
1062 }
1063 strbuf_addch(type, tolower(*p));
1064 }
1065
1066 if (!charset)
1067 return;
1068
1069 strbuf_reset(charset);
1070 while (*p) {
1071 while (isspace(*p) || *p == ';')
1072 p++;
1073 if (!extract_param(p, "charset", charset))
1074 return;
1075 while (*p && !isspace(*p))
1076 p++;
1077 }
1078
1079 if (!charset->len && starts_with(type->buf, "text/"))
1080 strbuf_addstr(charset, "ISO-8859-1");
1081 }
1082
1083 static void write_accept_language(struct strbuf *buf)
1084 {
1085 /*
1086 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1087 * that, q-value will be smaller than 0.001, the minimum q-value the
1088 * HTTP specification allows. See
1089 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1090 */
1091 const int MAX_DECIMAL_PLACES = 3;
1092 const int MAX_LANGUAGE_TAGS = 1000;
1093 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1094 char **language_tags = NULL;
1095 int num_langs = 0;
1096 const char *s = get_preferred_languages();
1097 int i;
1098 struct strbuf tag = STRBUF_INIT;
1099
1100 /* Don't add Accept-Language header if no language is preferred. */
1101 if (!s)
1102 return;
1103
1104 /*
1105 * Split the colon-separated string of preferred languages into
1106 * language_tags array.
1107 */
1108 do {
1109 /* collect language tag */
1110 for (; *s && (isalnum(*s) || *s == '_'); s++)
1111 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1112
1113 /* skip .codeset, @modifier and any other unnecessary parts */
1114 while (*s && *s != ':')
1115 s++;
1116
1117 if (tag.len) {
1118 num_langs++;
1119 REALLOC_ARRAY(language_tags, num_langs);
1120 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1121 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1122 break;
1123 }
1124 } while (*s++);
1125
1126 /* write Accept-Language header into buf */
1127 if (num_langs) {
1128 int last_buf_len = 0;
1129 int max_q;
1130 int decimal_places;
1131 char q_format[32];
1132
1133 /* add '*' */
1134 REALLOC_ARRAY(language_tags, num_langs + 1);
1135 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1136
1137 /* compute decimal_places */
1138 for (max_q = 1, decimal_places = 0;
1139 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1140 decimal_places++, max_q *= 10)
1141 ;
1142
1143 sprintf(q_format, ";q=0.%%0%dd", decimal_places);
1144
1145 strbuf_addstr(buf, "Accept-Language: ");
1146
1147 for (i = 0; i < num_langs; i++) {
1148 if (i > 0)
1149 strbuf_addstr(buf, ", ");
1150
1151 strbuf_addstr(buf, language_tags[i]);
1152
1153 if (i > 0)
1154 strbuf_addf(buf, q_format, max_q - i);
1155
1156 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1157 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1158 break;
1159 }
1160
1161 last_buf_len = buf->len;
1162 }
1163 }
1164
1165 /* free language tags -- last one is a static '*' */
1166 for (i = 0; i < num_langs - 1; i++)
1167 free(language_tags[i]);
1168 free(language_tags);
1169 }
1170
1171 /*
1172 * Get an Accept-Language header which indicates user's preferred languages.
1173 *
1174 * Examples:
1175 * LANGUAGE= -> ""
1176 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1177 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1178 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1179 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1180 * LANGUAGE= LANG=C -> ""
1181 */
1182 static const char *get_accept_language(void)
1183 {
1184 if (!cached_accept_language) {
1185 struct strbuf buf = STRBUF_INIT;
1186 write_accept_language(&buf);
1187 if (buf.len > 0)
1188 cached_accept_language = strbuf_detach(&buf, NULL);
1189 }
1190
1191 return cached_accept_language;
1192 }
1193
1194 /* http_request() targets */
1195 #define HTTP_REQUEST_STRBUF 0
1196 #define HTTP_REQUEST_FILE 1
1197
1198 static int http_request(const char *url,
1199 void *result, int target,
1200 const struct http_get_options *options)
1201 {
1202 struct active_request_slot *slot;
1203 struct slot_results results;
1204 struct curl_slist *headers = NULL;
1205 struct strbuf buf = STRBUF_INIT;
1206 const char *accept_language;
1207 int ret;
1208
1209 slot = get_active_slot();
1210 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1211
1212 if (result == NULL) {
1213 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1214 } else {
1215 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1216 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1217
1218 if (target == HTTP_REQUEST_FILE) {
1219 long posn = ftell(result);
1220 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1221 fwrite);
1222 if (posn > 0) {
1223 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1224 headers = curl_slist_append(headers, buf.buf);
1225 strbuf_reset(&buf);
1226 }
1227 } else
1228 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1229 fwrite_buffer);
1230 }
1231
1232 accept_language = get_accept_language();
1233
1234 if (accept_language)
1235 headers = curl_slist_append(headers, accept_language);
1236
1237 strbuf_addstr(&buf, "Pragma:");
1238 if (options && options->no_cache)
1239 strbuf_addstr(&buf, " no-cache");
1240 if (options && options->keep_error)
1241 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1242
1243 headers = curl_slist_append(headers, buf.buf);
1244
1245 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1246 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1247 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1248
1249 ret = run_one_slot(slot, &results);
1250
1251 if (options && options->content_type) {
1252 struct strbuf raw = STRBUF_INIT;
1253 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1254 extract_content_type(&raw, options->content_type,
1255 options->charset);
1256 strbuf_release(&raw);
1257 }
1258
1259 if (options && options->effective_url)
1260 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1261 options->effective_url);
1262
1263 curl_slist_free_all(headers);
1264 strbuf_release(&buf);
1265
1266 return ret;
1267 }
1268
1269 /*
1270 * Update the "base" url to a more appropriate value, as deduced by
1271 * redirects seen when requesting a URL starting with "url".
1272 *
1273 * The "asked" parameter is a URL that we asked curl to access, and must begin
1274 * with "base".
1275 *
1276 * The "got" parameter is the URL that curl reported to us as where we ended
1277 * up.
1278 *
1279 * Returns 1 if we updated the base url, 0 otherwise.
1280 *
1281 * Our basic strategy is to compare "base" and "asked" to find the bits
1282 * specific to our request. We then strip those bits off of "got" to yield the
1283 * new base. So for example, if our base is "http://example.com/foo.git",
1284 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1285 * with "https://other.example.com/foo.git/info/refs". We would want the
1286 * new URL to become "https://other.example.com/foo.git".
1287 *
1288 * Note that this assumes a sane redirect scheme. It's entirely possible
1289 * in the example above to end up at a URL that does not even end in
1290 * "info/refs". In such a case we simply punt, as there is not much we can
1291 * do (and such a scheme is unlikely to represent a real git repository,
1292 * which means we are likely about to abort anyway).
1293 */
1294 static int update_url_from_redirect(struct strbuf *base,
1295 const char *asked,
1296 const struct strbuf *got)
1297 {
1298 const char *tail;
1299 size_t tail_len;
1300
1301 if (!strcmp(asked, got->buf))
1302 return 0;
1303
1304 if (!skip_prefix(asked, base->buf, &tail))
1305 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1306 asked, base->buf);
1307
1308 tail_len = strlen(tail);
1309
1310 if (got->len < tail_len ||
1311 strcmp(tail, got->buf + got->len - tail_len))
1312 return 0; /* insane redirect scheme */
1313
1314 strbuf_reset(base);
1315 strbuf_add(base, got->buf, got->len - tail_len);
1316 return 1;
1317 }
1318
1319 static int http_request_reauth(const char *url,
1320 void *result, int target,
1321 struct http_get_options *options)
1322 {
1323 int ret = http_request(url, result, target, options);
1324
1325 if (options && options->effective_url && options->base_url) {
1326 if (update_url_from_redirect(options->base_url,
1327 url, options->effective_url)) {
1328 credential_from_url(&http_auth, options->base_url->buf);
1329 url = options->effective_url->buf;
1330 }
1331 }
1332
1333 if (ret != HTTP_REAUTH)
1334 return ret;
1335
1336 /*
1337 * If we are using KEEP_ERROR, the previous request may have
1338 * put cruft into our output stream; we should clear it out before
1339 * making our next request. We only know how to do this for
1340 * the strbuf case, but that is enough to satisfy current callers.
1341 */
1342 if (options && options->keep_error) {
1343 switch (target) {
1344 case HTTP_REQUEST_STRBUF:
1345 strbuf_reset(result);
1346 break;
1347 default:
1348 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1349 }
1350 }
1351
1352 credential_fill(&http_auth);
1353
1354 return http_request(url, result, target, options);
1355 }
1356
1357 int http_get_strbuf(const char *url,
1358 struct strbuf *result,
1359 struct http_get_options *options)
1360 {
1361 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1362 }
1363
1364 /*
1365 * Downloads a URL and stores the result in the given file.
1366 *
1367 * If a previous interrupted download is detected (i.e. a previous temporary
1368 * file is still around) the download is resumed.
1369 */
1370 static int http_get_file(const char *url, const char *filename,
1371 struct http_get_options *options)
1372 {
1373 int ret;
1374 struct strbuf tmpfile = STRBUF_INIT;
1375 FILE *result;
1376
1377 strbuf_addf(&tmpfile, "%s.temp", filename);
1378 result = fopen(tmpfile.buf, "a");
1379 if (!result) {
1380 error("Unable to open local file %s", tmpfile.buf);
1381 ret = HTTP_ERROR;
1382 goto cleanup;
1383 }
1384
1385 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1386 fclose(result);
1387
1388 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1389 ret = HTTP_ERROR;
1390 cleanup:
1391 strbuf_release(&tmpfile);
1392 return ret;
1393 }
1394
1395 int http_fetch_ref(const char *base, struct ref *ref)
1396 {
1397 struct http_get_options options = {0};
1398 char *url;
1399 struct strbuf buffer = STRBUF_INIT;
1400 int ret = -1;
1401
1402 options.no_cache = 1;
1403
1404 url = quote_ref_url(base, ref->name);
1405 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1406 strbuf_rtrim(&buffer);
1407 if (buffer.len == 40)
1408 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1409 else if (starts_with(buffer.buf, "ref: ")) {
1410 ref->symref = xstrdup(buffer.buf + 5);
1411 ret = 0;
1412 }
1413 }
1414
1415 strbuf_release(&buffer);
1416 free(url);
1417 return ret;
1418 }
1419
1420 /* Helpers for fetching packs */
1421 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1422 {
1423 char *url, *tmp;
1424 struct strbuf buf = STRBUF_INIT;
1425
1426 if (http_is_verbose)
1427 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1428
1429 end_url_with_slash(&buf, base_url);
1430 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1431 url = strbuf_detach(&buf, NULL);
1432
1433 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1434 tmp = strbuf_detach(&buf, NULL);
1435
1436 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1437 error("Unable to get pack index %s", url);
1438 free(tmp);
1439 tmp = NULL;
1440 }
1441
1442 free(url);
1443 return tmp;
1444 }
1445
1446 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1447 unsigned char *sha1, const char *base_url)
1448 {
1449 struct packed_git *new_pack;
1450 char *tmp_idx = NULL;
1451 int ret;
1452
1453 if (has_pack_index(sha1)) {
1454 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1455 if (!new_pack)
1456 return -1; /* parse_pack_index() already issued error message */
1457 goto add_pack;
1458 }
1459
1460 tmp_idx = fetch_pack_index(sha1, base_url);
1461 if (!tmp_idx)
1462 return -1;
1463
1464 new_pack = parse_pack_index(sha1, tmp_idx);
1465 if (!new_pack) {
1466 unlink(tmp_idx);
1467 free(tmp_idx);
1468
1469 return -1; /* parse_pack_index() already issued error message */
1470 }
1471
1472 ret = verify_pack_index(new_pack);
1473 if (!ret) {
1474 close_pack_index(new_pack);
1475 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1476 }
1477 free(tmp_idx);
1478 if (ret)
1479 return -1;
1480
1481 add_pack:
1482 new_pack->next = *packs_head;
1483 *packs_head = new_pack;
1484 return 0;
1485 }
1486
1487 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1488 {
1489 struct http_get_options options = {0};
1490 int ret = 0, i = 0;
1491 char *url, *data;
1492 struct strbuf buf = STRBUF_INIT;
1493 unsigned char sha1[20];
1494
1495 end_url_with_slash(&buf, base_url);
1496 strbuf_addstr(&buf, "objects/info/packs");
1497 url = strbuf_detach(&buf, NULL);
1498
1499 options.no_cache = 1;
1500 ret = http_get_strbuf(url, &buf, &options);
1501 if (ret != HTTP_OK)
1502 goto cleanup;
1503
1504 data = buf.buf;
1505 while (i < buf.len) {
1506 switch (data[i]) {
1507 case 'P':
1508 i++;
1509 if (i + 52 <= buf.len &&
1510 starts_with(data + i, " pack-") &&
1511 starts_with(data + i + 46, ".pack\n")) {
1512 get_sha1_hex(data + i + 6, sha1);
1513 fetch_and_setup_pack_index(packs_head, sha1,
1514 base_url);
1515 i += 51;
1516 break;
1517 }
1518 default:
1519 while (i < buf.len && data[i] != '\n')
1520 i++;
1521 }
1522 i++;
1523 }
1524
1525 cleanup:
1526 free(url);
1527 return ret;
1528 }
1529
1530 void release_http_pack_request(struct http_pack_request *preq)
1531 {
1532 if (preq->packfile != NULL) {
1533 fclose(preq->packfile);
1534 preq->packfile = NULL;
1535 }
1536 if (preq->range_header != NULL) {
1537 curl_slist_free_all(preq->range_header);
1538 preq->range_header = NULL;
1539 }
1540 preq->slot = NULL;
1541 free(preq->url);
1542 free(preq);
1543 }
1544
1545 int finish_http_pack_request(struct http_pack_request *preq)
1546 {
1547 struct packed_git **lst;
1548 struct packed_git *p = preq->target;
1549 char *tmp_idx;
1550 struct child_process ip = CHILD_PROCESS_INIT;
1551 const char *ip_argv[8];
1552
1553 close_pack_index(p);
1554
1555 fclose(preq->packfile);
1556 preq->packfile = NULL;
1557
1558 lst = preq->lst;
1559 while (*lst != p)
1560 lst = &((*lst)->next);
1561 *lst = (*lst)->next;
1562
1563 tmp_idx = xstrdup(preq->tmpfile);
1564 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1565 ".idx.temp");
1566
1567 ip_argv[0] = "index-pack";
1568 ip_argv[1] = "-o";
1569 ip_argv[2] = tmp_idx;
1570 ip_argv[3] = preq->tmpfile;
1571 ip_argv[4] = NULL;
1572
1573 ip.argv = ip_argv;
1574 ip.git_cmd = 1;
1575 ip.no_stdin = 1;
1576 ip.no_stdout = 1;
1577
1578 if (run_command(&ip)) {
1579 unlink(preq->tmpfile);
1580 unlink(tmp_idx);
1581 free(tmp_idx);
1582 return -1;
1583 }
1584
1585 unlink(sha1_pack_index_name(p->sha1));
1586
1587 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1588 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1589 free(tmp_idx);
1590 return -1;
1591 }
1592
1593 install_packed_git(p);
1594 free(tmp_idx);
1595 return 0;
1596 }
1597
1598 struct http_pack_request *new_http_pack_request(
1599 struct packed_git *target, const char *base_url)
1600 {
1601 long prev_posn = 0;
1602 char range[RANGE_HEADER_SIZE];
1603 struct strbuf buf = STRBUF_INIT;
1604 struct http_pack_request *preq;
1605
1606 preq = xcalloc(1, sizeof(*preq));
1607 preq->target = target;
1608
1609 end_url_with_slash(&buf, base_url);
1610 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1611 sha1_to_hex(target->sha1));
1612 preq->url = strbuf_detach(&buf, NULL);
1613
1614 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1615 sha1_pack_name(target->sha1));
1616 preq->packfile = fopen(preq->tmpfile, "a");
1617 if (!preq->packfile) {
1618 error("Unable to open local file %s for pack",
1619 preq->tmpfile);
1620 goto abort;
1621 }
1622
1623 preq->slot = get_active_slot();
1624 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1625 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1626 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1627 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1628 no_pragma_header);
1629
1630 /*
1631 * If there is data present from a previous transfer attempt,
1632 * resume where it left off
1633 */
1634 prev_posn = ftell(preq->packfile);
1635 if (prev_posn>0) {
1636 if (http_is_verbose)
1637 fprintf(stderr,
1638 "Resuming fetch of pack %s at byte %ld\n",
1639 sha1_to_hex(target->sha1), prev_posn);
1640 sprintf(range, "Range: bytes=%ld-", prev_posn);
1641 preq->range_header = curl_slist_append(NULL, range);
1642 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1643 preq->range_header);
1644 }
1645
1646 return preq;
1647
1648 abort:
1649 free(preq->url);
1650 free(preq);
1651 return NULL;
1652 }
1653
1654 /* Helpers for fetching objects (loose) */
1655 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1656 void *data)
1657 {
1658 unsigned char expn[4096];
1659 size_t size = eltsize * nmemb;
1660 int posn = 0;
1661 struct http_object_request *freq =
1662 (struct http_object_request *)data;
1663 do {
1664 ssize_t retval = xwrite(freq->localfile,
1665 (char *) ptr + posn, size - posn);
1666 if (retval < 0)
1667 return posn;
1668 posn += retval;
1669 } while (posn < size);
1670
1671 freq->stream.avail_in = size;
1672 freq->stream.next_in = (void *)ptr;
1673 do {
1674 freq->stream.next_out = expn;
1675 freq->stream.avail_out = sizeof(expn);
1676 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1677 git_SHA1_Update(&freq->c, expn,
1678 sizeof(expn) - freq->stream.avail_out);
1679 } while (freq->stream.avail_in && freq->zret == Z_OK);
1680 return size;
1681 }
1682
1683 struct http_object_request *new_http_object_request(const char *base_url,
1684 unsigned char *sha1)
1685 {
1686 char *hex = sha1_to_hex(sha1);
1687 const char *filename;
1688 char prevfile[PATH_MAX];
1689 int prevlocal;
1690 char prev_buf[PREV_BUF_SIZE];
1691 ssize_t prev_read = 0;
1692 long prev_posn = 0;
1693 char range[RANGE_HEADER_SIZE];
1694 struct curl_slist *range_header = NULL;
1695 struct http_object_request *freq;
1696
1697 freq = xcalloc(1, sizeof(*freq));
1698 hashcpy(freq->sha1, sha1);
1699 freq->localfile = -1;
1700
1701 filename = sha1_file_name(sha1);
1702 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1703 "%s.temp", filename);
1704
1705 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1706 unlink_or_warn(prevfile);
1707 rename(freq->tmpfile, prevfile);
1708 unlink_or_warn(freq->tmpfile);
1709
1710 if (freq->localfile != -1)
1711 error("fd leakage in start: %d", freq->localfile);
1712 freq->localfile = open(freq->tmpfile,
1713 O_WRONLY | O_CREAT | O_EXCL, 0666);
1714 /*
1715 * This could have failed due to the "lazy directory creation";
1716 * try to mkdir the last path component.
1717 */
1718 if (freq->localfile < 0 && errno == ENOENT) {
1719 char *dir = strrchr(freq->tmpfile, '/');
1720 if (dir) {
1721 *dir = 0;
1722 mkdir(freq->tmpfile, 0777);
1723 *dir = '/';
1724 }
1725 freq->localfile = open(freq->tmpfile,
1726 O_WRONLY | O_CREAT | O_EXCL, 0666);
1727 }
1728
1729 if (freq->localfile < 0) {
1730 error("Couldn't create temporary file %s: %s",
1731 freq->tmpfile, strerror(errno));
1732 goto abort;
1733 }
1734
1735 git_inflate_init(&freq->stream);
1736
1737 git_SHA1_Init(&freq->c);
1738
1739 freq->url = get_remote_object_url(base_url, hex, 0);
1740
1741 /*
1742 * If a previous temp file is present, process what was already
1743 * fetched.
1744 */
1745 prevlocal = open(prevfile, O_RDONLY);
1746 if (prevlocal != -1) {
1747 do {
1748 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1749 if (prev_read>0) {
1750 if (fwrite_sha1_file(prev_buf,
1751 1,
1752 prev_read,
1753 freq) == prev_read) {
1754 prev_posn += prev_read;
1755 } else {
1756 prev_read = -1;
1757 }
1758 }
1759 } while (prev_read > 0);
1760 close(prevlocal);
1761 }
1762 unlink_or_warn(prevfile);
1763
1764 /*
1765 * Reset inflate/SHA1 if there was an error reading the previous temp
1766 * file; also rewind to the beginning of the local file.
1767 */
1768 if (prev_read == -1) {
1769 memset(&freq->stream, 0, sizeof(freq->stream));
1770 git_inflate_init(&freq->stream);
1771 git_SHA1_Init(&freq->c);
1772 if (prev_posn>0) {
1773 prev_posn = 0;
1774 lseek(freq->localfile, 0, SEEK_SET);
1775 if (ftruncate(freq->localfile, 0) < 0) {
1776 error("Couldn't truncate temporary file %s: %s",
1777 freq->tmpfile, strerror(errno));
1778 goto abort;
1779 }
1780 }
1781 }
1782
1783 freq->slot = get_active_slot();
1784
1785 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1786 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1787 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1788 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1789 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1790
1791 /*
1792 * If we have successfully processed data from a previous fetch
1793 * attempt, only fetch the data we don't already have.
1794 */
1795 if (prev_posn>0) {
1796 if (http_is_verbose)
1797 fprintf(stderr,
1798 "Resuming fetch of object %s at byte %ld\n",
1799 hex, prev_posn);
1800 sprintf(range, "Range: bytes=%ld-", prev_posn);
1801 range_header = curl_slist_append(range_header, range);
1802 curl_easy_setopt(freq->slot->curl,
1803 CURLOPT_HTTPHEADER, range_header);
1804 }
1805
1806 return freq;
1807
1808 abort:
1809 free(freq->url);
1810 free(freq);
1811 return NULL;
1812 }
1813
1814 void process_http_object_request(struct http_object_request *freq)
1815 {
1816 if (freq->slot == NULL)
1817 return;
1818 freq->curl_result = freq->slot->curl_result;
1819 freq->http_code = freq->slot->http_code;
1820 freq->slot = NULL;
1821 }
1822
1823 int finish_http_object_request(struct http_object_request *freq)
1824 {
1825 struct stat st;
1826
1827 close(freq->localfile);
1828 freq->localfile = -1;
1829
1830 process_http_object_request(freq);
1831
1832 if (freq->http_code == 416) {
1833 warning("requested range invalid; we may already have all the data.");
1834 } else if (freq->curl_result != CURLE_OK) {
1835 if (stat(freq->tmpfile, &st) == 0)
1836 if (st.st_size == 0)
1837 unlink_or_warn(freq->tmpfile);
1838 return -1;
1839 }
1840
1841 git_inflate_end(&freq->stream);
1842 git_SHA1_Final(freq->real_sha1, &freq->c);
1843 if (freq->zret != Z_STREAM_END) {
1844 unlink_or_warn(freq->tmpfile);
1845 return -1;
1846 }
1847 if (hashcmp(freq->sha1, freq->real_sha1)) {
1848 unlink_or_warn(freq->tmpfile);
1849 return -1;
1850 }
1851 freq->rename =
1852 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
1853
1854 return freq->rename;
1855 }
1856
1857 void abort_http_object_request(struct http_object_request *freq)
1858 {
1859 unlink_or_warn(freq->tmpfile);
1860
1861 release_http_object_request(freq);
1862 }
1863
1864 void release_http_object_request(struct http_object_request *freq)
1865 {
1866 if (freq->localfile != -1) {
1867 close(freq->localfile);
1868 freq->localfile = -1;
1869 }
1870 if (freq->url != NULL) {
1871 free(freq->url);
1872 freq->url = NULL;
1873 }
1874 if (freq->slot != NULL) {
1875 freq->slot->callback_func = NULL;
1876 freq->slot->callback_data = NULL;
1877 release_active_slot(freq->slot);
1878 freq->slot = NULL;
1879 }
1880 }
The Best VCS Around