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Sixth batch for post 2.8 cycle
[git/raj.git] / http.c
blob4304b80ad3ac9d8ae249bc0bc007074bc5aa6181
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 #if LIBCURL_VERSION_NUM >= 0x070a08
15 long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
16 #else
17 long int git_curl_ipresolve;
18 #endif
19 int active_requests;
20 int http_is_verbose;
21 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
22
23 #if LIBCURL_VERSION_NUM >= 0x070a06
24 #define LIBCURL_CAN_HANDLE_AUTH_ANY
25 #endif
26
27 static int min_curl_sessions = 1;
28 static int curl_session_count;
29 #ifdef USE_CURL_MULTI
30 static int max_requests = -1;
31 static CURLM *curlm;
32 #endif
33 #ifndef NO_CURL_EASY_DUPHANDLE
34 static CURL *curl_default;
35 #endif
36
37 #define PREV_BUF_SIZE 4096
38
39 char curl_errorstr[CURL_ERROR_SIZE];
40
41 static int curl_ssl_verify = -1;
42 static int curl_ssl_try;
43 static const char *ssl_cert;
44 static const char *ssl_cipherlist;
45 static const char *ssl_version;
46 static struct {
47 const char *name;
48 long ssl_version;
49 } sslversions[] = {
50 { "sslv2", CURL_SSLVERSION_SSLv2 },
51 { "sslv3", CURL_SSLVERSION_SSLv3 },
52 { "tlsv1", CURL_SSLVERSION_TLSv1 },
53 #if LIBCURL_VERSION_NUM >= 0x072200
54 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
55 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
56 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
57 #endif
58 };
59 #if LIBCURL_VERSION_NUM >= 0x070903
60 static const char *ssl_key;
61 #endif
62 #if LIBCURL_VERSION_NUM >= 0x070908
63 static const char *ssl_capath;
64 #endif
65 #if LIBCURL_VERSION_NUM >= 0x072c00
66 static const char *ssl_pinnedkey;
67 #endif
68 static const char *ssl_cainfo;
69 static long curl_low_speed_limit = -1;
70 static long curl_low_speed_time = -1;
71 static int curl_ftp_no_epsv;
72 static const char *curl_http_proxy;
73 static const char *curl_no_proxy;
74 static const char *http_proxy_authmethod;
75 static struct {
76 const char *name;
77 long curlauth_param;
78 } proxy_authmethods[] = {
79 { "basic", CURLAUTH_BASIC },
80 { "digest", CURLAUTH_DIGEST },
81 { "negotiate", CURLAUTH_GSSNEGOTIATE },
82 { "ntlm", CURLAUTH_NTLM },
83 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
84 { "anyauth", CURLAUTH_ANY },
85 #endif
86 /*
87 * CURLAUTH_DIGEST_IE has no corresponding command-line option in
88 * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
89 * here, too
90 */
91 };
92 static struct credential proxy_auth = CREDENTIAL_INIT;
93 static const char *curl_proxyuserpwd;
94 static const char *curl_cookie_file;
95 static int curl_save_cookies;
96 struct credential http_auth = CREDENTIAL_INIT;
97 static int http_proactive_auth;
98 static const char *user_agent;
99 static int curl_empty_auth;
100
101 #if LIBCURL_VERSION_NUM >= 0x071700
102 /* Use CURLOPT_KEYPASSWD as is */
103 #elif LIBCURL_VERSION_NUM >= 0x070903
104 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
105 #else
106 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
107 #endif
108
109 static struct credential cert_auth = CREDENTIAL_INIT;
110 static int ssl_cert_password_required;
111 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
112 static unsigned long http_auth_methods = CURLAUTH_ANY;
113 #endif
114
115 static struct curl_slist *pragma_header;
116 static struct curl_slist *no_pragma_header;
117
118 static struct active_request_slot *active_queue_head;
119
120 static char *cached_accept_language;
121
122 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
123 {
124 size_t size = eltsize * nmemb;
125 struct buffer *buffer = buffer_;
126
127 if (size > buffer->buf.len - buffer->posn)
128 size = buffer->buf.len - buffer->posn;
129 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
130 buffer->posn += size;
131
132 return size;
133 }
134
135 #ifndef NO_CURL_IOCTL
136 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
137 {
138 struct buffer *buffer = clientp;
139
140 switch (cmd) {
141 case CURLIOCMD_NOP:
142 return CURLIOE_OK;
143
144 case CURLIOCMD_RESTARTREAD:
145 buffer->posn = 0;
146 return CURLIOE_OK;
147
148 default:
149 return CURLIOE_UNKNOWNCMD;
150 }
151 }
152 #endif
153
154 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
155 {
156 size_t size = eltsize * nmemb;
157 struct strbuf *buffer = buffer_;
158
159 strbuf_add(buffer, ptr, size);
160 return size;
161 }
162
163 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
164 {
165 return eltsize * nmemb;
166 }
167
168 static void closedown_active_slot(struct active_request_slot *slot)
169 {
170 active_requests--;
171 slot->in_use = 0;
172 }
173
174 static void finish_active_slot(struct active_request_slot *slot)
175 {
176 closedown_active_slot(slot);
177 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
178
179 if (slot->finished != NULL)
180 (*slot->finished) = 1;
181
182 /* Store slot results so they can be read after the slot is reused */
183 if (slot->results != NULL) {
184 slot->results->curl_result = slot->curl_result;
185 slot->results->http_code = slot->http_code;
186 #if LIBCURL_VERSION_NUM >= 0x070a08
187 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
188 &slot->results->auth_avail);
189 #else
190 slot->results->auth_avail = 0;
191 #endif
192
193 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
194 &slot->results->http_connectcode);
195 }
196
197 /* Run callback if appropriate */
198 if (slot->callback_func != NULL)
199 slot->callback_func(slot->callback_data);
200 }
201
202 #ifdef USE_CURL_MULTI
203 static void process_curl_messages(void)
204 {
205 int num_messages;
206 struct active_request_slot *slot;
207 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
208
209 while (curl_message != NULL) {
210 if (curl_message->msg == CURLMSG_DONE) {
211 int curl_result = curl_message->data.result;
212 slot = active_queue_head;
213 while (slot != NULL &&
214 slot->curl != curl_message->easy_handle)
215 slot = slot->next;
216 if (slot != NULL) {
217 curl_multi_remove_handle(curlm, slot->curl);
218 slot->curl_result = curl_result;
219 finish_active_slot(slot);
220 } else {
221 fprintf(stderr, "Received DONE message for unknown request!\n");
222 }
223 } else {
224 fprintf(stderr, "Unknown CURL message received: %d\n",
225 (int)curl_message->msg);
226 }
227 curl_message = curl_multi_info_read(curlm, &num_messages);
228 }
229 }
230 #endif
231
232 static int http_options(const char *var, const char *value, void *cb)
233 {
234 if (!strcmp("http.sslverify", var)) {
235 curl_ssl_verify = git_config_bool(var, value);
236 return 0;
237 }
238 if (!strcmp("http.sslcipherlist", var))
239 return git_config_string(&ssl_cipherlist, var, value);
240 if (!strcmp("http.sslversion", var))
241 return git_config_string(&ssl_version, var, value);
242 if (!strcmp("http.sslcert", var))
243 return git_config_string(&ssl_cert, var, value);
244 #if LIBCURL_VERSION_NUM >= 0x070903
245 if (!strcmp("http.sslkey", var))
246 return git_config_string(&ssl_key, var, value);
247 #endif
248 #if LIBCURL_VERSION_NUM >= 0x070908
249 if (!strcmp("http.sslcapath", var))
250 return git_config_pathname(&ssl_capath, var, value);
251 #endif
252 if (!strcmp("http.sslcainfo", var))
253 return git_config_pathname(&ssl_cainfo, var, value);
254 if (!strcmp("http.sslcertpasswordprotected", var)) {
255 ssl_cert_password_required = git_config_bool(var, value);
256 return 0;
257 }
258 if (!strcmp("http.ssltry", var)) {
259 curl_ssl_try = git_config_bool(var, value);
260 return 0;
261 }
262 if (!strcmp("http.minsessions", var)) {
263 min_curl_sessions = git_config_int(var, value);
264 #ifndef USE_CURL_MULTI
265 if (min_curl_sessions > 1)
266 min_curl_sessions = 1;
267 #endif
268 return 0;
269 }
270 #ifdef USE_CURL_MULTI
271 if (!strcmp("http.maxrequests", var)) {
272 max_requests = git_config_int(var, value);
273 return 0;
274 }
275 #endif
276 if (!strcmp("http.lowspeedlimit", var)) {
277 curl_low_speed_limit = (long)git_config_int(var, value);
278 return 0;
279 }
280 if (!strcmp("http.lowspeedtime", var)) {
281 curl_low_speed_time = (long)git_config_int(var, value);
282 return 0;
283 }
284
285 if (!strcmp("http.noepsv", var)) {
286 curl_ftp_no_epsv = git_config_bool(var, value);
287 return 0;
288 }
289 if (!strcmp("http.proxy", var))
290 return git_config_string(&curl_http_proxy, var, value);
291
292 if (!strcmp("http.proxyauthmethod", var))
293 return git_config_string(&http_proxy_authmethod, var, value);
294
295 if (!strcmp("http.cookiefile", var))
296 return git_config_string(&curl_cookie_file, var, value);
297 if (!strcmp("http.savecookies", var)) {
298 curl_save_cookies = git_config_bool(var, value);
299 return 0;
300 }
301
302 if (!strcmp("http.postbuffer", var)) {
303 http_post_buffer = git_config_int(var, value);
304 if (http_post_buffer < LARGE_PACKET_MAX)
305 http_post_buffer = LARGE_PACKET_MAX;
306 return 0;
307 }
308
309 if (!strcmp("http.useragent", var))
310 return git_config_string(&user_agent, var, value);
311
312 if (!strcmp("http.emptyauth", var)) {
313 curl_empty_auth = git_config_bool(var, value);
314 return 0;
315 }
316
317 if (!strcmp("http.pinnedpubkey", var)) {
318 #if LIBCURL_VERSION_NUM >= 0x072c00
319 return git_config_pathname(&ssl_pinnedkey, var, value);
320 #else
321 warning(_("Public key pinning not supported with cURL < 7.44.0"));
322 return 0;
323 #endif
324 }
325
326 /* Fall back on the default ones */
327 return git_default_config(var, value, cb);
328 }
329
330 static void init_curl_http_auth(CURL *result)
331 {
332 if (!http_auth.username) {
333 if (curl_empty_auth)
334 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
335 return;
336 }
337
338 credential_fill(&http_auth);
339
340 #if LIBCURL_VERSION_NUM >= 0x071301
341 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
342 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
343 #else
344 {
345 static struct strbuf up = STRBUF_INIT;
346 /*
347 * Note that we assume we only ever have a single set of
348 * credentials in a given program run, so we do not have
349 * to worry about updating this buffer, only setting its
350 * initial value.
351 */
352 if (!up.len)
353 strbuf_addf(&up, "%s:%s",
354 http_auth.username, http_auth.password);
355 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
356 }
357 #endif
358 }
359
360 /* *var must be free-able */
361 static void var_override(const char **var, char *value)
362 {
363 if (value) {
364 free((void *)*var);
365 *var = xstrdup(value);
366 }
367 }
368
369 static void set_proxyauth_name_password(CURL *result)
370 {
371 #if LIBCURL_VERSION_NUM >= 0x071301
372 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
373 proxy_auth.username);
374 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
375 proxy_auth.password);
376 #else
377 struct strbuf s = STRBUF_INIT;
378
379 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
380 strbuf_addch(&s, ':');
381 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
382 curl_proxyuserpwd = strbuf_detach(&s, NULL);
383 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
384 #endif
385 }
386
387 static void init_curl_proxy_auth(CURL *result)
388 {
389 if (proxy_auth.username) {
390 if (!proxy_auth.password)
391 credential_fill(&proxy_auth);
392 set_proxyauth_name_password(result);
393 }
394
395 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
396
397 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
398 if (http_proxy_authmethod) {
399 int i;
400 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
401 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
402 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
403 proxy_authmethods[i].curlauth_param);
404 break;
405 }
406 }
407 if (i == ARRAY_SIZE(proxy_authmethods)) {
408 warning("unsupported proxy authentication method %s: using anyauth",
409 http_proxy_authmethod);
410 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
411 }
412 }
413 else
414 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
415 #endif
416 }
417
418 static int has_cert_password(void)
419 {
420 if (ssl_cert == NULL || ssl_cert_password_required != 1)
421 return 0;
422 if (!cert_auth.password) {
423 cert_auth.protocol = xstrdup("cert");
424 cert_auth.username = xstrdup("");
425 cert_auth.path = xstrdup(ssl_cert);
426 credential_fill(&cert_auth);
427 }
428 return 1;
429 }
430
431 #if LIBCURL_VERSION_NUM >= 0x071900
432 static void set_curl_keepalive(CURL *c)
433 {
434 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
435 }
436
437 #elif LIBCURL_VERSION_NUM >= 0x071000
438 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
439 {
440 int ka = 1;
441 int rc;
442 socklen_t len = (socklen_t)sizeof(ka);
443
444 if (type != CURLSOCKTYPE_IPCXN)
445 return 0;
446
447 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
448 if (rc < 0)
449 warning("unable to set SO_KEEPALIVE on socket %s",
450 strerror(errno));
451
452 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
453 }
454
455 static void set_curl_keepalive(CURL *c)
456 {
457 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
458 }
459
460 #else
461 static void set_curl_keepalive(CURL *c)
462 {
463 /* not supported on older curl versions */
464 }
465 #endif
466
467 static CURL *get_curl_handle(void)
468 {
469 CURL *result = curl_easy_init();
470 long allowed_protocols = 0;
471
472 if (!result)
473 die("curl_easy_init failed");
474
475 if (!curl_ssl_verify) {
476 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
477 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
478 } else {
479 /* Verify authenticity of the peer's certificate */
480 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
481 /* The name in the cert must match whom we tried to connect */
482 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
483 }
484
485 #if LIBCURL_VERSION_NUM >= 0x070907
486 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
487 #endif
488 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
489 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
490 #endif
491
492 if (http_proactive_auth)
493 init_curl_http_auth(result);
494
495 if (getenv("GIT_SSL_VERSION"))
496 ssl_version = getenv("GIT_SSL_VERSION");
497 if (ssl_version && *ssl_version) {
498 int i;
499 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
500 if (!strcmp(ssl_version, sslversions[i].name)) {
501 curl_easy_setopt(result, CURLOPT_SSLVERSION,
502 sslversions[i].ssl_version);
503 break;
504 }
505 }
506 if (i == ARRAY_SIZE(sslversions))
507 warning("unsupported ssl version %s: using default",
508 ssl_version);
509 }
510
511 if (getenv("GIT_SSL_CIPHER_LIST"))
512 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
513 if (ssl_cipherlist != NULL && *ssl_cipherlist)
514 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
515 ssl_cipherlist);
516
517 if (ssl_cert != NULL)
518 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
519 if (has_cert_password())
520 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
521 #if LIBCURL_VERSION_NUM >= 0x070903
522 if (ssl_key != NULL)
523 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
524 #endif
525 #if LIBCURL_VERSION_NUM >= 0x070908
526 if (ssl_capath != NULL)
527 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
528 #endif
529 #if LIBCURL_VERSION_NUM >= 0x072c00
530 if (ssl_pinnedkey != NULL)
531 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
532 #endif
533 if (ssl_cainfo != NULL)
534 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
535
536 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
537 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
538 curl_low_speed_limit);
539 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
540 curl_low_speed_time);
541 }
542
543 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
544 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
545 #if LIBCURL_VERSION_NUM >= 0x071301
546 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
547 #elif LIBCURL_VERSION_NUM >= 0x071101
548 curl_easy_setopt(result, CURLOPT_POST301, 1);
549 #endif
550 #if LIBCURL_VERSION_NUM >= 0x071304
551 if (is_transport_allowed("http"))
552 allowed_protocols |= CURLPROTO_HTTP;
553 if (is_transport_allowed("https"))
554 allowed_protocols |= CURLPROTO_HTTPS;
555 if (is_transport_allowed("ftp"))
556 allowed_protocols |= CURLPROTO_FTP;
557 if (is_transport_allowed("ftps"))
558 allowed_protocols |= CURLPROTO_FTPS;
559 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
560 #else
561 if (transport_restrict_protocols())
562 warning("protocol restrictions not applied to curl redirects because\n"
563 "your curl version is too old (>= 7.19.4)");
564 #endif
565
566 if (getenv("GIT_CURL_VERBOSE"))
567 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
568
569 curl_easy_setopt(result, CURLOPT_USERAGENT,
570 user_agent ? user_agent : git_user_agent());
571
572 if (curl_ftp_no_epsv)
573 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
574
575 #ifdef CURLOPT_USE_SSL
576 if (curl_ssl_try)
577 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
578 #endif
579
580 /*
581 * CURL also examines these variables as a fallback; but we need to query
582 * them here in order to decide whether to prompt for missing password (cf.
583 * init_curl_proxy_auth()).
584 *
585 * Unlike many other common environment variables, these are historically
586 * lowercase only. It appears that CURL did not know this and implemented
587 * only uppercase variants, which was later corrected to take both - with
588 * the exception of http_proxy, which is lowercase only also in CURL. As
589 * the lowercase versions are the historical quasi-standard, they take
590 * precedence here, as in CURL.
591 */
592 if (!curl_http_proxy) {
593 if (!strcmp(http_auth.protocol, "https")) {
594 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
595 var_override(&curl_http_proxy, getenv("https_proxy"));
596 } else {
597 var_override(&curl_http_proxy, getenv("http_proxy"));
598 }
599 if (!curl_http_proxy) {
600 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
601 var_override(&curl_http_proxy, getenv("all_proxy"));
602 }
603 }
604
605 if (curl_http_proxy) {
606 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
607 #if LIBCURL_VERSION_NUM >= 0x071800
608 if (starts_with(curl_http_proxy, "socks5h"))
609 curl_easy_setopt(result,
610 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
611 else if (starts_with(curl_http_proxy, "socks5"))
612 curl_easy_setopt(result,
613 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
614 else if (starts_with(curl_http_proxy, "socks4a"))
615 curl_easy_setopt(result,
616 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
617 else if (starts_with(curl_http_proxy, "socks"))
618 curl_easy_setopt(result,
619 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
620 #endif
621 if (strstr(curl_http_proxy, "://"))
622 credential_from_url(&proxy_auth, curl_http_proxy);
623 else {
624 struct strbuf url = STRBUF_INIT;
625 strbuf_addf(&url, "http://%s", curl_http_proxy);
626 credential_from_url(&proxy_auth, url.buf);
627 strbuf_release(&url);
628 }
629
630 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
631 #if LIBCURL_VERSION_NUM >= 0x071304
632 var_override(&curl_no_proxy, getenv("NO_PROXY"));
633 var_override(&curl_no_proxy, getenv("no_proxy"));
634 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
635 #endif
636 }
637 init_curl_proxy_auth(result);
638
639 set_curl_keepalive(result);
640
641 return result;
642 }
643
644 static void set_from_env(const char **var, const char *envname)
645 {
646 const char *val = getenv(envname);
647 if (val)
648 *var = val;
649 }
650
651 void http_init(struct remote *remote, const char *url, int proactive_auth)
652 {
653 char *low_speed_limit;
654 char *low_speed_time;
655 char *normalized_url;
656 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
657
658 config.section = "http";
659 config.key = NULL;
660 config.collect_fn = http_options;
661 config.cascade_fn = git_default_config;
662 config.cb = NULL;
663
664 http_is_verbose = 0;
665 normalized_url = url_normalize(url, &config.url);
666
667 git_config(urlmatch_config_entry, &config);
668 free(normalized_url);
669
670 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
671 die("curl_global_init failed");
672
673 http_proactive_auth = proactive_auth;
674
675 if (remote && remote->http_proxy)
676 curl_http_proxy = xstrdup(remote->http_proxy);
677
678 if (remote)
679 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
680
681 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
682 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
683
684 #ifdef USE_CURL_MULTI
685 {
686 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
687 if (http_max_requests != NULL)
688 max_requests = atoi(http_max_requests);
689 }
690
691 curlm = curl_multi_init();
692 if (!curlm)
693 die("curl_multi_init failed");
694 #endif
695
696 if (getenv("GIT_SSL_NO_VERIFY"))
697 curl_ssl_verify = 0;
698
699 set_from_env(&ssl_cert, "GIT_SSL_CERT");
700 #if LIBCURL_VERSION_NUM >= 0x070903
701 set_from_env(&ssl_key, "GIT_SSL_KEY");
702 #endif
703 #if LIBCURL_VERSION_NUM >= 0x070908
704 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
705 #endif
706 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
707
708 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
709
710 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
711 if (low_speed_limit != NULL)
712 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
713 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
714 if (low_speed_time != NULL)
715 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
716
717 if (curl_ssl_verify == -1)
718 curl_ssl_verify = 1;
719
720 curl_session_count = 0;
721 #ifdef USE_CURL_MULTI
722 if (max_requests < 1)
723 max_requests = DEFAULT_MAX_REQUESTS;
724 #endif
725
726 if (getenv("GIT_CURL_FTP_NO_EPSV"))
727 curl_ftp_no_epsv = 1;
728
729 if (url) {
730 credential_from_url(&http_auth, url);
731 if (!ssl_cert_password_required &&
732 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
733 starts_with(url, "https://"))
734 ssl_cert_password_required = 1;
735 }
736
737 #ifndef NO_CURL_EASY_DUPHANDLE
738 curl_default = get_curl_handle();
739 #endif
740 }
741
742 void http_cleanup(void)
743 {
744 struct active_request_slot *slot = active_queue_head;
745
746 while (slot != NULL) {
747 struct active_request_slot *next = slot->next;
748 if (slot->curl != NULL) {
749 #ifdef USE_CURL_MULTI
750 curl_multi_remove_handle(curlm, slot->curl);
751 #endif
752 curl_easy_cleanup(slot->curl);
753 }
754 free(slot);
755 slot = next;
756 }
757 active_queue_head = NULL;
758
759 #ifndef NO_CURL_EASY_DUPHANDLE
760 curl_easy_cleanup(curl_default);
761 #endif
762
763 #ifdef USE_CURL_MULTI
764 curl_multi_cleanup(curlm);
765 #endif
766 curl_global_cleanup();
767
768 curl_slist_free_all(pragma_header);
769 pragma_header = NULL;
770
771 curl_slist_free_all(no_pragma_header);
772 no_pragma_header = NULL;
773
774 if (curl_http_proxy) {
775 free((void *)curl_http_proxy);
776 curl_http_proxy = NULL;
777 }
778
779 if (proxy_auth.password) {
780 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
781 free(proxy_auth.password);
782 proxy_auth.password = NULL;
783 }
784
785 free((void *)curl_proxyuserpwd);
786 curl_proxyuserpwd = NULL;
787
788 free((void *)http_proxy_authmethod);
789 http_proxy_authmethod = NULL;
790
791 if (cert_auth.password != NULL) {
792 memset(cert_auth.password, 0, strlen(cert_auth.password));
793 free(cert_auth.password);
794 cert_auth.password = NULL;
795 }
796 ssl_cert_password_required = 0;
797
798 free(cached_accept_language);
799 cached_accept_language = NULL;
800 }
801
802 struct active_request_slot *get_active_slot(void)
803 {
804 struct active_request_slot *slot = active_queue_head;
805 struct active_request_slot *newslot;
806
807 #ifdef USE_CURL_MULTI
808 int num_transfers;
809
810 /* Wait for a slot to open up if the queue is full */
811 while (active_requests >= max_requests) {
812 curl_multi_perform(curlm, &num_transfers);
813 if (num_transfers < active_requests)
814 process_curl_messages();
815 }
816 #endif
817
818 while (slot != NULL && slot->in_use)
819 slot = slot->next;
820
821 if (slot == NULL) {
822 newslot = xmalloc(sizeof(*newslot));
823 newslot->curl = NULL;
824 newslot->in_use = 0;
825 newslot->next = NULL;
826
827 slot = active_queue_head;
828 if (slot == NULL) {
829 active_queue_head = newslot;
830 } else {
831 while (slot->next != NULL)
832 slot = slot->next;
833 slot->next = newslot;
834 }
835 slot = newslot;
836 }
837
838 if (slot->curl == NULL) {
839 #ifdef NO_CURL_EASY_DUPHANDLE
840 slot->curl = get_curl_handle();
841 #else
842 slot->curl = curl_easy_duphandle(curl_default);
843 #endif
844 curl_session_count++;
845 }
846
847 active_requests++;
848 slot->in_use = 1;
849 slot->results = NULL;
850 slot->finished = NULL;
851 slot->callback_data = NULL;
852 slot->callback_func = NULL;
853 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
854 if (curl_save_cookies)
855 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
856 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
857 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
858 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
859 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
860 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
861 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
862 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
863 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
864 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
865 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
866
867 #if LIBCURL_VERSION_NUM >= 0x070a08
868 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
869 #endif
870 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
871 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
872 #endif
873 if (http_auth.password || curl_empty_auth)
874 init_curl_http_auth(slot->curl);
875
876 return slot;
877 }
878
879 int start_active_slot(struct active_request_slot *slot)
880 {
881 #ifdef USE_CURL_MULTI
882 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
883 int num_transfers;
884
885 if (curlm_result != CURLM_OK &&
886 curlm_result != CURLM_CALL_MULTI_PERFORM) {
887 active_requests--;
888 slot->in_use = 0;
889 return 0;
890 }
891
892 /*
893 * We know there must be something to do, since we just added
894 * something.
895 */
896 curl_multi_perform(curlm, &num_transfers);
897 #endif
898 return 1;
899 }
900
901 #ifdef USE_CURL_MULTI
902 struct fill_chain {
903 void *data;
904 int (*fill)(void *);
905 struct fill_chain *next;
906 };
907
908 static struct fill_chain *fill_cfg;
909
910 void add_fill_function(void *data, int (*fill)(void *))
911 {
912 struct fill_chain *new = xmalloc(sizeof(*new));
913 struct fill_chain **linkp = &fill_cfg;
914 new->data = data;
915 new->fill = fill;
916 new->next = NULL;
917 while (*linkp)
918 linkp = &(*linkp)->next;
919 *linkp = new;
920 }
921
922 void fill_active_slots(void)
923 {
924 struct active_request_slot *slot = active_queue_head;
925
926 while (active_requests < max_requests) {
927 struct fill_chain *fill;
928 for (fill = fill_cfg; fill; fill = fill->next)
929 if (fill->fill(fill->data))
930 break;
931
932 if (!fill)
933 break;
934 }
935
936 while (slot != NULL) {
937 if (!slot->in_use && slot->curl != NULL
938 && curl_session_count > min_curl_sessions) {
939 curl_easy_cleanup(slot->curl);
940 slot->curl = NULL;
941 curl_session_count--;
942 }
943 slot = slot->next;
944 }
945 }
946
947 void step_active_slots(void)
948 {
949 int num_transfers;
950 CURLMcode curlm_result;
951
952 do {
953 curlm_result = curl_multi_perform(curlm, &num_transfers);
954 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
955 if (num_transfers < active_requests) {
956 process_curl_messages();
957 fill_active_slots();
958 }
959 }
960 #endif
961
962 void run_active_slot(struct active_request_slot *slot)
963 {
964 #ifdef USE_CURL_MULTI
965 fd_set readfds;
966 fd_set writefds;
967 fd_set excfds;
968 int max_fd;
969 struct timeval select_timeout;
970 int finished = 0;
971
972 slot->finished = &finished;
973 while (!finished) {
974 step_active_slots();
975
976 if (slot->in_use) {
977 #if LIBCURL_VERSION_NUM >= 0x070f04
978 long curl_timeout;
979 curl_multi_timeout(curlm, &curl_timeout);
980 if (curl_timeout == 0) {
981 continue;
982 } else if (curl_timeout == -1) {
983 select_timeout.tv_sec = 0;
984 select_timeout.tv_usec = 50000;
985 } else {
986 select_timeout.tv_sec = curl_timeout / 1000;
987 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
988 }
989 #else
990 select_timeout.tv_sec = 0;
991 select_timeout.tv_usec = 50000;
992 #endif
993
994 max_fd = -1;
995 FD_ZERO(&readfds);
996 FD_ZERO(&writefds);
997 FD_ZERO(&excfds);
998 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
999
1000 /*
1001 * It can happen that curl_multi_timeout returns a pathologically
1002 * long timeout when curl_multi_fdset returns no file descriptors
1003 * to read. See commit message for more details.
1004 */
1005 if (max_fd < 0 &&
1006 (select_timeout.tv_sec > 0 ||
1007 select_timeout.tv_usec > 50000)) {
1008 select_timeout.tv_sec = 0;
1009 select_timeout.tv_usec = 50000;
1010 }
1011
1012 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1013 }
1014 }
1015 #else
1016 while (slot->in_use) {
1017 slot->curl_result = curl_easy_perform(slot->curl);
1018 finish_active_slot(slot);
1019 }
1020 #endif
1021 }
1022
1023 static void release_active_slot(struct active_request_slot *slot)
1024 {
1025 closedown_active_slot(slot);
1026 if (slot->curl && curl_session_count > min_curl_sessions) {
1027 #ifdef USE_CURL_MULTI
1028 curl_multi_remove_handle(curlm, slot->curl);
1029 #endif
1030 curl_easy_cleanup(slot->curl);
1031 slot->curl = NULL;
1032 curl_session_count--;
1033 }
1034 #ifdef USE_CURL_MULTI
1035 fill_active_slots();
1036 #endif
1037 }
1038
1039 void finish_all_active_slots(void)
1040 {
1041 struct active_request_slot *slot = active_queue_head;
1042
1043 while (slot != NULL)
1044 if (slot->in_use) {
1045 run_active_slot(slot);
1046 slot = active_queue_head;
1047 } else {
1048 slot = slot->next;
1049 }
1050 }
1051
1052 /* Helpers for modifying and creating URLs */
1053 static inline int needs_quote(int ch)
1054 {
1055 if (((ch >= 'A') && (ch <= 'Z'))
1056 || ((ch >= 'a') && (ch <= 'z'))
1057 || ((ch >= '0') && (ch <= '9'))
1058 || (ch == '/')
1059 || (ch == '-')
1060 || (ch == '.'))
1061 return 0;
1062 return 1;
1063 }
1064
1065 static char *quote_ref_url(const char *base, const char *ref)
1066 {
1067 struct strbuf buf = STRBUF_INIT;
1068 const char *cp;
1069 int ch;
1070
1071 end_url_with_slash(&buf, base);
1072
1073 for (cp = ref; (ch = *cp) != 0; cp++)
1074 if (needs_quote(ch))
1075 strbuf_addf(&buf, "%%%02x", ch);
1076 else
1077 strbuf_addch(&buf, *cp);
1078
1079 return strbuf_detach(&buf, NULL);
1080 }
1081
1082 void append_remote_object_url(struct strbuf *buf, const char *url,
1083 const char *hex,
1084 int only_two_digit_prefix)
1085 {
1086 end_url_with_slash(buf, url);
1087
1088 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1089 if (!only_two_digit_prefix)
1090 strbuf_addf(buf, "%s", hex+2);
1091 }
1092
1093 char *get_remote_object_url(const char *url, const char *hex,
1094 int only_two_digit_prefix)
1095 {
1096 struct strbuf buf = STRBUF_INIT;
1097 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1098 return strbuf_detach(&buf, NULL);
1099 }
1100
1101 static int handle_curl_result(struct slot_results *results)
1102 {
1103 /*
1104 * If we see a failing http code with CURLE_OK, we have turned off
1105 * FAILONERROR (to keep the server's custom error response), and should
1106 * translate the code into failure here.
1107 */
1108 if (results->curl_result == CURLE_OK &&
1109 results->http_code >= 400) {
1110 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1111 /*
1112 * Normally curl will already have put the "reason phrase"
1113 * from the server into curl_errorstr; unfortunately without
1114 * FAILONERROR it is lost, so we can give only the numeric
1115 * status code.
1116 */
1117 snprintf(curl_errorstr, sizeof(curl_errorstr),
1118 "The requested URL returned error: %ld",
1119 results->http_code);
1120 }
1121
1122 if (results->curl_result == CURLE_OK) {
1123 credential_approve(&http_auth);
1124 if (proxy_auth.password)
1125 credential_approve(&proxy_auth);
1126 return HTTP_OK;
1127 } else if (missing_target(results))
1128 return HTTP_MISSING_TARGET;
1129 else if (results->http_code == 401) {
1130 if (http_auth.username && http_auth.password) {
1131 credential_reject(&http_auth);
1132 return HTTP_NOAUTH;
1133 } else {
1134 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1135 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1136 #endif
1137 return HTTP_REAUTH;
1138 }
1139 } else {
1140 if (results->http_connectcode == 407)
1141 credential_reject(&proxy_auth);
1142 #if LIBCURL_VERSION_NUM >= 0x070c00
1143 if (!curl_errorstr[0])
1144 strlcpy(curl_errorstr,
1145 curl_easy_strerror(results->curl_result),
1146 sizeof(curl_errorstr));
1147 #endif
1148 return HTTP_ERROR;
1149 }
1150 }
1151
1152 int run_one_slot(struct active_request_slot *slot,
1153 struct slot_results *results)
1154 {
1155 slot->results = results;
1156 if (!start_active_slot(slot)) {
1157 snprintf(curl_errorstr, sizeof(curl_errorstr),
1158 "failed to start HTTP request");
1159 return HTTP_START_FAILED;
1160 }
1161
1162 run_active_slot(slot);
1163 return handle_curl_result(results);
1164 }
1165
1166 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1167 {
1168 char *ptr;
1169 CURLcode ret;
1170
1171 strbuf_reset(buf);
1172 ret = curl_easy_getinfo(curl, info, &ptr);
1173 if (!ret && ptr)
1174 strbuf_addstr(buf, ptr);
1175 return ret;
1176 }
1177
1178 /*
1179 * Check for and extract a content-type parameter. "raw"
1180 * should be positioned at the start of the potential
1181 * parameter, with any whitespace already removed.
1182 *
1183 * "name" is the name of the parameter. The value is appended
1184 * to "out".
1185 */
1186 static int extract_param(const char *raw, const char *name,
1187 struct strbuf *out)
1188 {
1189 size_t len = strlen(name);
1190
1191 if (strncasecmp(raw, name, len))
1192 return -1;
1193 raw += len;
1194
1195 if (*raw != '=')
1196 return -1;
1197 raw++;
1198
1199 while (*raw && !isspace(*raw) && *raw != ';')
1200 strbuf_addch(out, *raw++);
1201 return 0;
1202 }
1203
1204 /*
1205 * Extract a normalized version of the content type, with any
1206 * spaces suppressed, all letters lowercased, and no trailing ";"
1207 * or parameters.
1208 *
1209 * Note that we will silently remove even invalid whitespace. For
1210 * example, "text / plain" is specifically forbidden by RFC 2616,
1211 * but "text/plain" is the only reasonable output, and this keeps
1212 * our code simple.
1213 *
1214 * If the "charset" argument is not NULL, store the value of any
1215 * charset parameter there.
1216 *
1217 * Example:
1218 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1219 * "text / plain" -> "text/plain"
1220 */
1221 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1222 struct strbuf *charset)
1223 {
1224 const char *p;
1225
1226 strbuf_reset(type);
1227 strbuf_grow(type, raw->len);
1228 for (p = raw->buf; *p; p++) {
1229 if (isspace(*p))
1230 continue;
1231 if (*p == ';') {
1232 p++;
1233 break;
1234 }
1235 strbuf_addch(type, tolower(*p));
1236 }
1237
1238 if (!charset)
1239 return;
1240
1241 strbuf_reset(charset);
1242 while (*p) {
1243 while (isspace(*p) || *p == ';')
1244 p++;
1245 if (!extract_param(p, "charset", charset))
1246 return;
1247 while (*p && !isspace(*p))
1248 p++;
1249 }
1250
1251 if (!charset->len && starts_with(type->buf, "text/"))
1252 strbuf_addstr(charset, "ISO-8859-1");
1253 }
1254
1255 static void write_accept_language(struct strbuf *buf)
1256 {
1257 /*
1258 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1259 * that, q-value will be smaller than 0.001, the minimum q-value the
1260 * HTTP specification allows. See
1261 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1262 */
1263 const int MAX_DECIMAL_PLACES = 3;
1264 const int MAX_LANGUAGE_TAGS = 1000;
1265 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1266 char **language_tags = NULL;
1267 int num_langs = 0;
1268 const char *s = get_preferred_languages();
1269 int i;
1270 struct strbuf tag = STRBUF_INIT;
1271
1272 /* Don't add Accept-Language header if no language is preferred. */
1273 if (!s)
1274 return;
1275
1276 /*
1277 * Split the colon-separated string of preferred languages into
1278 * language_tags array.
1279 */
1280 do {
1281 /* collect language tag */
1282 for (; *s && (isalnum(*s) || *s == '_'); s++)
1283 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1284
1285 /* skip .codeset, @modifier and any other unnecessary parts */
1286 while (*s && *s != ':')
1287 s++;
1288
1289 if (tag.len) {
1290 num_langs++;
1291 REALLOC_ARRAY(language_tags, num_langs);
1292 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1293 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1294 break;
1295 }
1296 } while (*s++);
1297
1298 /* write Accept-Language header into buf */
1299 if (num_langs) {
1300 int last_buf_len = 0;
1301 int max_q;
1302 int decimal_places;
1303 char q_format[32];
1304
1305 /* add '*' */
1306 REALLOC_ARRAY(language_tags, num_langs + 1);
1307 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1308
1309 /* compute decimal_places */
1310 for (max_q = 1, decimal_places = 0;
1311 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1312 decimal_places++, max_q *= 10)
1313 ;
1314
1315 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1316
1317 strbuf_addstr(buf, "Accept-Language: ");
1318
1319 for (i = 0; i < num_langs; i++) {
1320 if (i > 0)
1321 strbuf_addstr(buf, ", ");
1322
1323 strbuf_addstr(buf, language_tags[i]);
1324
1325 if (i > 0)
1326 strbuf_addf(buf, q_format, max_q - i);
1327
1328 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1329 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1330 break;
1331 }
1332
1333 last_buf_len = buf->len;
1334 }
1335 }
1336
1337 /* free language tags -- last one is a static '*' */
1338 for (i = 0; i < num_langs - 1; i++)
1339 free(language_tags[i]);
1340 free(language_tags);
1341 }
1342
1343 /*
1344 * Get an Accept-Language header which indicates user's preferred languages.
1345 *
1346 * Examples:
1347 * LANGUAGE= -> ""
1348 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1349 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1350 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1351 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1352 * LANGUAGE= LANG=C -> ""
1353 */
1354 static const char *get_accept_language(void)
1355 {
1356 if (!cached_accept_language) {
1357 struct strbuf buf = STRBUF_INIT;
1358 write_accept_language(&buf);
1359 if (buf.len > 0)
1360 cached_accept_language = strbuf_detach(&buf, NULL);
1361 }
1362
1363 return cached_accept_language;
1364 }
1365
1366 static void http_opt_request_remainder(CURL *curl, off_t pos)
1367 {
1368 char buf[128];
1369 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1370 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1371 }
1372
1373 /* http_request() targets */
1374 #define HTTP_REQUEST_STRBUF 0
1375 #define HTTP_REQUEST_FILE 1
1376
1377 static int http_request(const char *url,
1378 void *result, int target,
1379 const struct http_get_options *options)
1380 {
1381 struct active_request_slot *slot;
1382 struct slot_results results;
1383 struct curl_slist *headers = NULL;
1384 struct strbuf buf = STRBUF_INIT;
1385 const char *accept_language;
1386 int ret;
1387
1388 slot = get_active_slot();
1389 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1390
1391 if (result == NULL) {
1392 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1393 } else {
1394 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1395 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1396
1397 if (target == HTTP_REQUEST_FILE) {
1398 off_t posn = ftello(result);
1399 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1400 fwrite);
1401 if (posn > 0)
1402 http_opt_request_remainder(slot->curl, posn);
1403 } else
1404 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1405 fwrite_buffer);
1406 }
1407
1408 accept_language = get_accept_language();
1409
1410 if (accept_language)
1411 headers = curl_slist_append(headers, accept_language);
1412
1413 strbuf_addstr(&buf, "Pragma:");
1414 if (options && options->no_cache)
1415 strbuf_addstr(&buf, " no-cache");
1416 if (options && options->keep_error)
1417 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1418
1419 headers = curl_slist_append(headers, buf.buf);
1420
1421 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1422 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1423 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1424
1425 ret = run_one_slot(slot, &results);
1426
1427 if (options && options->content_type) {
1428 struct strbuf raw = STRBUF_INIT;
1429 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1430 extract_content_type(&raw, options->content_type,
1431 options->charset);
1432 strbuf_release(&raw);
1433 }
1434
1435 if (options && options->effective_url)
1436 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1437 options->effective_url);
1438
1439 curl_slist_free_all(headers);
1440 strbuf_release(&buf);
1441
1442 return ret;
1443 }
1444
1445 /*
1446 * Update the "base" url to a more appropriate value, as deduced by
1447 * redirects seen when requesting a URL starting with "url".
1448 *
1449 * The "asked" parameter is a URL that we asked curl to access, and must begin
1450 * with "base".
1451 *
1452 * The "got" parameter is the URL that curl reported to us as where we ended
1453 * up.
1454 *
1455 * Returns 1 if we updated the base url, 0 otherwise.
1456 *
1457 * Our basic strategy is to compare "base" and "asked" to find the bits
1458 * specific to our request. We then strip those bits off of "got" to yield the
1459 * new base. So for example, if our base is "http://example.com/foo.git",
1460 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1461 * with "https://other.example.com/foo.git/info/refs". We would want the
1462 * new URL to become "https://other.example.com/foo.git".
1463 *
1464 * Note that this assumes a sane redirect scheme. It's entirely possible
1465 * in the example above to end up at a URL that does not even end in
1466 * "info/refs". In such a case we simply punt, as there is not much we can
1467 * do (and such a scheme is unlikely to represent a real git repository,
1468 * which means we are likely about to abort anyway).
1469 */
1470 static int update_url_from_redirect(struct strbuf *base,
1471 const char *asked,
1472 const struct strbuf *got)
1473 {
1474 const char *tail;
1475 size_t tail_len;
1476
1477 if (!strcmp(asked, got->buf))
1478 return 0;
1479
1480 if (!skip_prefix(asked, base->buf, &tail))
1481 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1482 asked, base->buf);
1483
1484 tail_len = strlen(tail);
1485
1486 if (got->len < tail_len ||
1487 strcmp(tail, got->buf + got->len - tail_len))
1488 return 0; /* insane redirect scheme */
1489
1490 strbuf_reset(base);
1491 strbuf_add(base, got->buf, got->len - tail_len);
1492 return 1;
1493 }
1494
1495 static int http_request_reauth(const char *url,
1496 void *result, int target,
1497 struct http_get_options *options)
1498 {
1499 int ret = http_request(url, result, target, options);
1500
1501 if (options && options->effective_url && options->base_url) {
1502 if (update_url_from_redirect(options->base_url,
1503 url, options->effective_url)) {
1504 credential_from_url(&http_auth, options->base_url->buf);
1505 url = options->effective_url->buf;
1506 }
1507 }
1508
1509 if (ret != HTTP_REAUTH)
1510 return ret;
1511
1512 /*
1513 * If we are using KEEP_ERROR, the previous request may have
1514 * put cruft into our output stream; we should clear it out before
1515 * making our next request. We only know how to do this for
1516 * the strbuf case, but that is enough to satisfy current callers.
1517 */
1518 if (options && options->keep_error) {
1519 switch (target) {
1520 case HTTP_REQUEST_STRBUF:
1521 strbuf_reset(result);
1522 break;
1523 default:
1524 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1525 }
1526 }
1527
1528 credential_fill(&http_auth);
1529
1530 return http_request(url, result, target, options);
1531 }
1532
1533 int http_get_strbuf(const char *url,
1534 struct strbuf *result,
1535 struct http_get_options *options)
1536 {
1537 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1538 }
1539
1540 /*
1541 * Downloads a URL and stores the result in the given file.
1542 *
1543 * If a previous interrupted download is detected (i.e. a previous temporary
1544 * file is still around) the download is resumed.
1545 */
1546 static int http_get_file(const char *url, const char *filename,
1547 struct http_get_options *options)
1548 {
1549 int ret;
1550 struct strbuf tmpfile = STRBUF_INIT;
1551 FILE *result;
1552
1553 strbuf_addf(&tmpfile, "%s.temp", filename);
1554 result = fopen(tmpfile.buf, "a");
1555 if (!result) {
1556 error("Unable to open local file %s", tmpfile.buf);
1557 ret = HTTP_ERROR;
1558 goto cleanup;
1559 }
1560
1561 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1562 fclose(result);
1563
1564 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1565 ret = HTTP_ERROR;
1566 cleanup:
1567 strbuf_release(&tmpfile);
1568 return ret;
1569 }
1570
1571 int http_fetch_ref(const char *base, struct ref *ref)
1572 {
1573 struct http_get_options options = {0};
1574 char *url;
1575 struct strbuf buffer = STRBUF_INIT;
1576 int ret = -1;
1577
1578 options.no_cache = 1;
1579
1580 url = quote_ref_url(base, ref->name);
1581 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1582 strbuf_rtrim(&buffer);
1583 if (buffer.len == 40)
1584 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1585 else if (starts_with(buffer.buf, "ref: ")) {
1586 ref->symref = xstrdup(buffer.buf + 5);
1587 ret = 0;
1588 }
1589 }
1590
1591 strbuf_release(&buffer);
1592 free(url);
1593 return ret;
1594 }
1595
1596 /* Helpers for fetching packs */
1597 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1598 {
1599 char *url, *tmp;
1600 struct strbuf buf = STRBUF_INIT;
1601
1602 if (http_is_verbose)
1603 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1604
1605 end_url_with_slash(&buf, base_url);
1606 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1607 url = strbuf_detach(&buf, NULL);
1608
1609 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1610 tmp = strbuf_detach(&buf, NULL);
1611
1612 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1613 error("Unable to get pack index %s", url);
1614 free(tmp);
1615 tmp = NULL;
1616 }
1617
1618 free(url);
1619 return tmp;
1620 }
1621
1622 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1623 unsigned char *sha1, const char *base_url)
1624 {
1625 struct packed_git *new_pack;
1626 char *tmp_idx = NULL;
1627 int ret;
1628
1629 if (has_pack_index(sha1)) {
1630 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1631 if (!new_pack)
1632 return -1; /* parse_pack_index() already issued error message */
1633 goto add_pack;
1634 }
1635
1636 tmp_idx = fetch_pack_index(sha1, base_url);
1637 if (!tmp_idx)
1638 return -1;
1639
1640 new_pack = parse_pack_index(sha1, tmp_idx);
1641 if (!new_pack) {
1642 unlink(tmp_idx);
1643 free(tmp_idx);
1644
1645 return -1; /* parse_pack_index() already issued error message */
1646 }
1647
1648 ret = verify_pack_index(new_pack);
1649 if (!ret) {
1650 close_pack_index(new_pack);
1651 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1652 }
1653 free(tmp_idx);
1654 if (ret)
1655 return -1;
1656
1657 add_pack:
1658 new_pack->next = *packs_head;
1659 *packs_head = new_pack;
1660 return 0;
1661 }
1662
1663 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1664 {
1665 struct http_get_options options = {0};
1666 int ret = 0, i = 0;
1667 char *url, *data;
1668 struct strbuf buf = STRBUF_INIT;
1669 unsigned char sha1[20];
1670
1671 end_url_with_slash(&buf, base_url);
1672 strbuf_addstr(&buf, "objects/info/packs");
1673 url = strbuf_detach(&buf, NULL);
1674
1675 options.no_cache = 1;
1676 ret = http_get_strbuf(url, &buf, &options);
1677 if (ret != HTTP_OK)
1678 goto cleanup;
1679
1680 data = buf.buf;
1681 while (i < buf.len) {
1682 switch (data[i]) {
1683 case 'P':
1684 i++;
1685 if (i + 52 <= buf.len &&
1686 starts_with(data + i, " pack-") &&
1687 starts_with(data + i + 46, ".pack\n")) {
1688 get_sha1_hex(data + i + 6, sha1);
1689 fetch_and_setup_pack_index(packs_head, sha1,
1690 base_url);
1691 i += 51;
1692 break;
1693 }
1694 default:
1695 while (i < buf.len && data[i] != '\n')
1696 i++;
1697 }
1698 i++;
1699 }
1700
1701 cleanup:
1702 free(url);
1703 return ret;
1704 }
1705
1706 void release_http_pack_request(struct http_pack_request *preq)
1707 {
1708 if (preq->packfile != NULL) {
1709 fclose(preq->packfile);
1710 preq->packfile = NULL;
1711 }
1712 preq->slot = NULL;
1713 free(preq->url);
1714 free(preq);
1715 }
1716
1717 int finish_http_pack_request(struct http_pack_request *preq)
1718 {
1719 struct packed_git **lst;
1720 struct packed_git *p = preq->target;
1721 char *tmp_idx;
1722 size_t len;
1723 struct child_process ip = CHILD_PROCESS_INIT;
1724 const char *ip_argv[8];
1725
1726 close_pack_index(p);
1727
1728 fclose(preq->packfile);
1729 preq->packfile = NULL;
1730
1731 lst = preq->lst;
1732 while (*lst != p)
1733 lst = &((*lst)->next);
1734 *lst = (*lst)->next;
1735
1736 if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1737 die("BUG: pack tmpfile does not end in .pack.temp?");
1738 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1739
1740 ip_argv[0] = "index-pack";
1741 ip_argv[1] = "-o";
1742 ip_argv[2] = tmp_idx;
1743 ip_argv[3] = preq->tmpfile;
1744 ip_argv[4] = NULL;
1745
1746 ip.argv = ip_argv;
1747 ip.git_cmd = 1;
1748 ip.no_stdin = 1;
1749 ip.no_stdout = 1;
1750
1751 if (run_command(&ip)) {
1752 unlink(preq->tmpfile);
1753 unlink(tmp_idx);
1754 free(tmp_idx);
1755 return -1;
1756 }
1757
1758 unlink(sha1_pack_index_name(p->sha1));
1759
1760 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1761 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1762 free(tmp_idx);
1763 return -1;
1764 }
1765
1766 install_packed_git(p);
1767 free(tmp_idx);
1768 return 0;
1769 }
1770
1771 struct http_pack_request *new_http_pack_request(
1772 struct packed_git *target, const char *base_url)
1773 {
1774 off_t prev_posn = 0;
1775 struct strbuf buf = STRBUF_INIT;
1776 struct http_pack_request *preq;
1777
1778 preq = xcalloc(1, sizeof(*preq));
1779 preq->target = target;
1780
1781 end_url_with_slash(&buf, base_url);
1782 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1783 sha1_to_hex(target->sha1));
1784 preq->url = strbuf_detach(&buf, NULL);
1785
1786 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1787 sha1_pack_name(target->sha1));
1788 preq->packfile = fopen(preq->tmpfile, "a");
1789 if (!preq->packfile) {
1790 error("Unable to open local file %s for pack",
1791 preq->tmpfile);
1792 goto abort;
1793 }
1794
1795 preq->slot = get_active_slot();
1796 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1797 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1798 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1799 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1800 no_pragma_header);
1801
1802 /*
1803 * If there is data present from a previous transfer attempt,
1804 * resume where it left off
1805 */
1806 prev_posn = ftello(preq->packfile);
1807 if (prev_posn>0) {
1808 if (http_is_verbose)
1809 fprintf(stderr,
1810 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
1811 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
1812 http_opt_request_remainder(preq->slot->curl, prev_posn);
1813 }
1814
1815 return preq;
1816
1817 abort:
1818 free(preq->url);
1819 free(preq);
1820 return NULL;
1821 }
1822
1823 /* Helpers for fetching objects (loose) */
1824 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1825 void *data)
1826 {
1827 unsigned char expn[4096];
1828 size_t size = eltsize * nmemb;
1829 int posn = 0;
1830 struct http_object_request *freq =
1831 (struct http_object_request *)data;
1832 do {
1833 ssize_t retval = xwrite(freq->localfile,
1834 (char *) ptr + posn, size - posn);
1835 if (retval < 0)
1836 return posn;
1837 posn += retval;
1838 } while (posn < size);
1839
1840 freq->stream.avail_in = size;
1841 freq->stream.next_in = (void *)ptr;
1842 do {
1843 freq->stream.next_out = expn;
1844 freq->stream.avail_out = sizeof(expn);
1845 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1846 git_SHA1_Update(&freq->c, expn,
1847 sizeof(expn) - freq->stream.avail_out);
1848 } while (freq->stream.avail_in && freq->zret == Z_OK);
1849 return size;
1850 }
1851
1852 struct http_object_request *new_http_object_request(const char *base_url,
1853 unsigned char *sha1)
1854 {
1855 char *hex = sha1_to_hex(sha1);
1856 const char *filename;
1857 char prevfile[PATH_MAX];
1858 int prevlocal;
1859 char prev_buf[PREV_BUF_SIZE];
1860 ssize_t prev_read = 0;
1861 off_t prev_posn = 0;
1862 struct http_object_request *freq;
1863
1864 freq = xcalloc(1, sizeof(*freq));
1865 hashcpy(freq->sha1, sha1);
1866 freq->localfile = -1;
1867
1868 filename = sha1_file_name(sha1);
1869 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1870 "%s.temp", filename);
1871
1872 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1873 unlink_or_warn(prevfile);
1874 rename(freq->tmpfile, prevfile);
1875 unlink_or_warn(freq->tmpfile);
1876
1877 if (freq->localfile != -1)
1878 error("fd leakage in start: %d", freq->localfile);
1879 freq->localfile = open(freq->tmpfile,
1880 O_WRONLY | O_CREAT | O_EXCL, 0666);
1881 /*
1882 * This could have failed due to the "lazy directory creation";
1883 * try to mkdir the last path component.
1884 */
1885 if (freq->localfile < 0 && errno == ENOENT) {
1886 char *dir = strrchr(freq->tmpfile, '/');
1887 if (dir) {
1888 *dir = 0;
1889 mkdir(freq->tmpfile, 0777);
1890 *dir = '/';
1891 }
1892 freq->localfile = open(freq->tmpfile,
1893 O_WRONLY | O_CREAT | O_EXCL, 0666);
1894 }
1895
1896 if (freq->localfile < 0) {
1897 error("Couldn't create temporary file %s: %s",
1898 freq->tmpfile, strerror(errno));
1899 goto abort;
1900 }
1901
1902 git_inflate_init(&freq->stream);
1903
1904 git_SHA1_Init(&freq->c);
1905
1906 freq->url = get_remote_object_url(base_url, hex, 0);
1907
1908 /*
1909 * If a previous temp file is present, process what was already
1910 * fetched.
1911 */
1912 prevlocal = open(prevfile, O_RDONLY);
1913 if (prevlocal != -1) {
1914 do {
1915 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1916 if (prev_read>0) {
1917 if (fwrite_sha1_file(prev_buf,
1918 1,
1919 prev_read,
1920 freq) == prev_read) {
1921 prev_posn += prev_read;
1922 } else {
1923 prev_read = -1;
1924 }
1925 }
1926 } while (prev_read > 0);
1927 close(prevlocal);
1928 }
1929 unlink_or_warn(prevfile);
1930
1931 /*
1932 * Reset inflate/SHA1 if there was an error reading the previous temp
1933 * file; also rewind to the beginning of the local file.
1934 */
1935 if (prev_read == -1) {
1936 memset(&freq->stream, 0, sizeof(freq->stream));
1937 git_inflate_init(&freq->stream);
1938 git_SHA1_Init(&freq->c);
1939 if (prev_posn>0) {
1940 prev_posn = 0;
1941 lseek(freq->localfile, 0, SEEK_SET);
1942 if (ftruncate(freq->localfile, 0) < 0) {
1943 error("Couldn't truncate temporary file %s: %s",
1944 freq->tmpfile, strerror(errno));
1945 goto abort;
1946 }
1947 }
1948 }
1949
1950 freq->slot = get_active_slot();
1951
1952 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1953 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1954 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1955 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1956 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1957
1958 /*
1959 * If we have successfully processed data from a previous fetch
1960 * attempt, only fetch the data we don't already have.
1961 */
1962 if (prev_posn>0) {
1963 if (http_is_verbose)
1964 fprintf(stderr,
1965 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
1966 hex, (uintmax_t)prev_posn);
1967 http_opt_request_remainder(freq->slot->curl, prev_posn);
1968 }
1969
1970 return freq;
1971
1972 abort:
1973 free(freq->url);
1974 free(freq);
1975 return NULL;
1976 }
1977
1978 void process_http_object_request(struct http_object_request *freq)
1979 {
1980 if (freq->slot == NULL)
1981 return;
1982 freq->curl_result = freq->slot->curl_result;
1983 freq->http_code = freq->slot->http_code;
1984 freq->slot = NULL;
1985 }
1986
1987 int finish_http_object_request(struct http_object_request *freq)
1988 {
1989 struct stat st;
1990
1991 close(freq->localfile);
1992 freq->localfile = -1;
1993
1994 process_http_object_request(freq);
1995
1996 if (freq->http_code == 416) {
1997 warning("requested range invalid; we may already have all the data.");
1998 } else if (freq->curl_result != CURLE_OK) {
1999 if (stat(freq->tmpfile, &st) == 0)
2000 if (st.st_size == 0)
2001 unlink_or_warn(freq->tmpfile);
2002 return -1;
2003 }
2004
2005 git_inflate_end(&freq->stream);
2006 git_SHA1_Final(freq->real_sha1, &freq->c);
2007 if (freq->zret != Z_STREAM_END) {
2008 unlink_or_warn(freq->tmpfile);
2009 return -1;
2010 }
2011 if (hashcmp(freq->sha1, freq->real_sha1)) {
2012 unlink_or_warn(freq->tmpfile);
2013 return -1;
2014 }
2015 freq->rename =
2016 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2017
2018 return freq->rename;
2019 }
2020
2021 void abort_http_object_request(struct http_object_request *freq)
2022 {
2023 unlink_or_warn(freq->tmpfile);
2024
2025 release_http_object_request(freq);
2026 }
2027
2028 void release_http_object_request(struct http_object_request *freq)
2029 {
2030 if (freq->localfile != -1) {
2031 close(freq->localfile);
2032 freq->localfile = -1;
2033 }
2034 if (freq->url != NULL) {
2035 free(freq->url);
2036 freq->url = NULL;
2037 }
2038 if (freq->slot != NULL) {
2039 freq->slot->callback_func = NULL;
2040 freq->slot->callback_data = NULL;
2041 release_active_slot(freq->slot);
2042 freq->slot = NULL;
2043 }
2044 }
ramsay's fork of git