?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
connect & http: support -4 and -6 switches for remote operations
[git.git] / http.c
blob67e7bc21b075402326ac8ba9d522476e562a577d
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 static const char *ssl_cainfo;
66 static long curl_low_speed_limit = -1;
67 static long curl_low_speed_time = -1;
68 static int curl_ftp_no_epsv;
69 static const char *curl_http_proxy;
70 static const char *curl_cookie_file;
71 static int curl_save_cookies;
72 struct credential http_auth = CREDENTIAL_INIT;
73 static int http_proactive_auth;
74 static const char *user_agent;
75
76 #if LIBCURL_VERSION_NUM >= 0x071700
77 /* Use CURLOPT_KEYPASSWD as is */
78 #elif LIBCURL_VERSION_NUM >= 0x070903
79 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
80 #else
81 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
82 #endif
83
84 static struct credential cert_auth = CREDENTIAL_INIT;
85 static int ssl_cert_password_required;
86 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
87 static unsigned long http_auth_methods = CURLAUTH_ANY;
88 #endif
89
90 static struct curl_slist *pragma_header;
91 static struct curl_slist *no_pragma_header;
92
93 static struct active_request_slot *active_queue_head;
94
95 static char *cached_accept_language;
96
97 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
98 {
99 size_t size = eltsize * nmemb;
100 struct buffer *buffer = buffer_;
101
102 if (size > buffer->buf.len - buffer->posn)
103 size = buffer->buf.len - buffer->posn;
104 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
105 buffer->posn += size;
106
107 return size;
108 }
109
110 #ifndef NO_CURL_IOCTL
111 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
112 {
113 struct buffer *buffer = clientp;
114
115 switch (cmd) {
116 case CURLIOCMD_NOP:
117 return CURLIOE_OK;
118
119 case CURLIOCMD_RESTARTREAD:
120 buffer->posn = 0;
121 return CURLIOE_OK;
122
123 default:
124 return CURLIOE_UNKNOWNCMD;
125 }
126 }
127 #endif
128
129 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
130 {
131 size_t size = eltsize * nmemb;
132 struct strbuf *buffer = buffer_;
133
134 strbuf_add(buffer, ptr, size);
135 return size;
136 }
137
138 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
139 {
140 return eltsize * nmemb;
141 }
142
143 static void closedown_active_slot(struct active_request_slot *slot)
144 {
145 active_requests--;
146 slot->in_use = 0;
147 }
148
149 static void finish_active_slot(struct active_request_slot *slot)
150 {
151 closedown_active_slot(slot);
152 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
153
154 if (slot->finished != NULL)
155 (*slot->finished) = 1;
156
157 /* Store slot results so they can be read after the slot is reused */
158 if (slot->results != NULL) {
159 slot->results->curl_result = slot->curl_result;
160 slot->results->http_code = slot->http_code;
161 #if LIBCURL_VERSION_NUM >= 0x070a08
162 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
163 &slot->results->auth_avail);
164 #else
165 slot->results->auth_avail = 0;
166 #endif
167 }
168
169 /* Run callback if appropriate */
170 if (slot->callback_func != NULL)
171 slot->callback_func(slot->callback_data);
172 }
173
174 #ifdef USE_CURL_MULTI
175 static void process_curl_messages(void)
176 {
177 int num_messages;
178 struct active_request_slot *slot;
179 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
180
181 while (curl_message != NULL) {
182 if (curl_message->msg == CURLMSG_DONE) {
183 int curl_result = curl_message->data.result;
184 slot = active_queue_head;
185 while (slot != NULL &&
186 slot->curl != curl_message->easy_handle)
187 slot = slot->next;
188 if (slot != NULL) {
189 curl_multi_remove_handle(curlm, slot->curl);
190 slot->curl_result = curl_result;
191 finish_active_slot(slot);
192 } else {
193 fprintf(stderr, "Received DONE message for unknown request!\n");
194 }
195 } else {
196 fprintf(stderr, "Unknown CURL message received: %d\n",
197 (int)curl_message->msg);
198 }
199 curl_message = curl_multi_info_read(curlm, &num_messages);
200 }
201 }
202 #endif
203
204 static int http_options(const char *var, const char *value, void *cb)
205 {
206 if (!strcmp("http.sslverify", var)) {
207 curl_ssl_verify = git_config_bool(var, value);
208 return 0;
209 }
210 if (!strcmp("http.sslcipherlist", var))
211 return git_config_string(&ssl_cipherlist, var, value);
212 if (!strcmp("http.sslversion", var))
213 return git_config_string(&ssl_version, var, value);
214 if (!strcmp("http.sslcert", var))
215 return git_config_string(&ssl_cert, var, value);
216 #if LIBCURL_VERSION_NUM >= 0x070903
217 if (!strcmp("http.sslkey", var))
218 return git_config_string(&ssl_key, var, value);
219 #endif
220 #if LIBCURL_VERSION_NUM >= 0x070908
221 if (!strcmp("http.sslcapath", var))
222 return git_config_pathname(&ssl_capath, var, value);
223 #endif
224 if (!strcmp("http.sslcainfo", var))
225 return git_config_pathname(&ssl_cainfo, var, value);
226 if (!strcmp("http.sslcertpasswordprotected", var)) {
227 ssl_cert_password_required = git_config_bool(var, value);
228 return 0;
229 }
230 if (!strcmp("http.ssltry", var)) {
231 curl_ssl_try = git_config_bool(var, value);
232 return 0;
233 }
234 if (!strcmp("http.minsessions", var)) {
235 min_curl_sessions = git_config_int(var, value);
236 #ifndef USE_CURL_MULTI
237 if (min_curl_sessions > 1)
238 min_curl_sessions = 1;
239 #endif
240 return 0;
241 }
242 #ifdef USE_CURL_MULTI
243 if (!strcmp("http.maxrequests", var)) {
244 max_requests = git_config_int(var, value);
245 return 0;
246 }
247 #endif
248 if (!strcmp("http.lowspeedlimit", var)) {
249 curl_low_speed_limit = (long)git_config_int(var, value);
250 return 0;
251 }
252 if (!strcmp("http.lowspeedtime", var)) {
253 curl_low_speed_time = (long)git_config_int(var, value);
254 return 0;
255 }
256
257 if (!strcmp("http.noepsv", var)) {
258 curl_ftp_no_epsv = git_config_bool(var, value);
259 return 0;
260 }
261 if (!strcmp("http.proxy", var))
262 return git_config_string(&curl_http_proxy, var, value);
263
264 if (!strcmp("http.cookiefile", var))
265 return git_config_string(&curl_cookie_file, var, value);
266 if (!strcmp("http.savecookies", var)) {
267 curl_save_cookies = git_config_bool(var, value);
268 return 0;
269 }
270
271 if (!strcmp("http.postbuffer", var)) {
272 http_post_buffer = git_config_int(var, value);
273 if (http_post_buffer < LARGE_PACKET_MAX)
274 http_post_buffer = LARGE_PACKET_MAX;
275 return 0;
276 }
277
278 if (!strcmp("http.useragent", var))
279 return git_config_string(&user_agent, var, value);
280
281 /* Fall back on the default ones */
282 return git_default_config(var, value, cb);
283 }
284
285 static void init_curl_http_auth(CURL *result)
286 {
287 if (!http_auth.username)
288 return;
289
290 credential_fill(&http_auth);
291
292 #if LIBCURL_VERSION_NUM >= 0x071301
293 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
294 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
295 #else
296 {
297 static struct strbuf up = STRBUF_INIT;
298 /*
299 * Note that we assume we only ever have a single set of
300 * credentials in a given program run, so we do not have
301 * to worry about updating this buffer, only setting its
302 * initial value.
303 */
304 if (!up.len)
305 strbuf_addf(&up, "%s:%s",
306 http_auth.username, http_auth.password);
307 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
308 }
309 #endif
310 }
311
312 static int has_cert_password(void)
313 {
314 if (ssl_cert == NULL || ssl_cert_password_required != 1)
315 return 0;
316 if (!cert_auth.password) {
317 cert_auth.protocol = xstrdup("cert");
318 cert_auth.username = xstrdup("");
319 cert_auth.path = xstrdup(ssl_cert);
320 credential_fill(&cert_auth);
321 }
322 return 1;
323 }
324
325 #if LIBCURL_VERSION_NUM >= 0x071900
326 static void set_curl_keepalive(CURL *c)
327 {
328 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
329 }
330
331 #elif LIBCURL_VERSION_NUM >= 0x071000
332 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
333 {
334 int ka = 1;
335 int rc;
336 socklen_t len = (socklen_t)sizeof(ka);
337
338 if (type != CURLSOCKTYPE_IPCXN)
339 return 0;
340
341 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
342 if (rc < 0)
343 warning("unable to set SO_KEEPALIVE on socket %s",
344 strerror(errno));
345
346 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
347 }
348
349 static void set_curl_keepalive(CURL *c)
350 {
351 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
352 }
353
354 #else
355 static void set_curl_keepalive(CURL *c)
356 {
357 /* not supported on older curl versions */
358 }
359 #endif
360
361 static CURL *get_curl_handle(void)
362 {
363 CURL *result = curl_easy_init();
364 long allowed_protocols = 0;
365
366 if (!result)
367 die("curl_easy_init failed");
368
369 if (!curl_ssl_verify) {
370 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
371 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
372 } else {
373 /* Verify authenticity of the peer's certificate */
374 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
375 /* The name in the cert must match whom we tried to connect */
376 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
377 }
378
379 #if LIBCURL_VERSION_NUM >= 0x070907
380 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
381 #endif
382 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
383 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
384 #endif
385
386 if (http_proactive_auth)
387 init_curl_http_auth(result);
388
389 if (getenv("GIT_SSL_VERSION"))
390 ssl_version = getenv("GIT_SSL_VERSION");
391 if (ssl_version && *ssl_version) {
392 int i;
393 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
394 if (!strcmp(ssl_version, sslversions[i].name)) {
395 curl_easy_setopt(result, CURLOPT_SSLVERSION,
396 sslversions[i].ssl_version);
397 break;
398 }
399 }
400 if (i == ARRAY_SIZE(sslversions))
401 warning("unsupported ssl version %s: using default",
402 ssl_version);
403 }
404
405 if (getenv("GIT_SSL_CIPHER_LIST"))
406 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
407 if (ssl_cipherlist != NULL && *ssl_cipherlist)
408 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
409 ssl_cipherlist);
410
411 if (ssl_cert != NULL)
412 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
413 if (has_cert_password())
414 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
415 #if LIBCURL_VERSION_NUM >= 0x070903
416 if (ssl_key != NULL)
417 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
418 #endif
419 #if LIBCURL_VERSION_NUM >= 0x070908
420 if (ssl_capath != NULL)
421 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
422 #endif
423 if (ssl_cainfo != NULL)
424 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
425
426 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
427 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
428 curl_low_speed_limit);
429 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
430 curl_low_speed_time);
431 }
432
433 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
434 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
435 #if LIBCURL_VERSION_NUM >= 0x071301
436 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
437 #elif LIBCURL_VERSION_NUM >= 0x071101
438 curl_easy_setopt(result, CURLOPT_POST301, 1);
439 #endif
440 #if LIBCURL_VERSION_NUM >= 0x071304
441 if (is_transport_allowed("http"))
442 allowed_protocols |= CURLPROTO_HTTP;
443 if (is_transport_allowed("https"))
444 allowed_protocols |= CURLPROTO_HTTPS;
445 if (is_transport_allowed("ftp"))
446 allowed_protocols |= CURLPROTO_FTP;
447 if (is_transport_allowed("ftps"))
448 allowed_protocols |= CURLPROTO_FTPS;
449 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
450 #else
451 if (transport_restrict_protocols())
452 warning("protocol restrictions not applied to curl redirects because\n"
453 "your curl version is too old (>= 7.19.4)");
454 #endif
455
456 if (getenv("GIT_CURL_VERBOSE"))
457 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
458
459 curl_easy_setopt(result, CURLOPT_USERAGENT,
460 user_agent ? user_agent : git_user_agent());
461
462 if (curl_ftp_no_epsv)
463 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
464
465 #ifdef CURLOPT_USE_SSL
466 if (curl_ssl_try)
467 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
468 #endif
469
470 if (curl_http_proxy) {
471 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
472 #if LIBCURL_VERSION_NUM >= 0x071800
473 if (starts_with(curl_http_proxy, "socks5"))
474 curl_easy_setopt(result,
475 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
476 else if (starts_with(curl_http_proxy, "socks4a"))
477 curl_easy_setopt(result,
478 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
479 else if (starts_with(curl_http_proxy, "socks"))
480 curl_easy_setopt(result,
481 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
482 #endif
483 }
484 #if LIBCURL_VERSION_NUM >= 0x070a07
485 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
486 #endif
487
488 set_curl_keepalive(result);
489
490 return result;
491 }
492
493 static void set_from_env(const char **var, const char *envname)
494 {
495 const char *val = getenv(envname);
496 if (val)
497 *var = val;
498 }
499
500 void http_init(struct remote *remote, const char *url, int proactive_auth)
501 {
502 char *low_speed_limit;
503 char *low_speed_time;
504 char *normalized_url;
505 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
506
507 config.section = "http";
508 config.key = NULL;
509 config.collect_fn = http_options;
510 config.cascade_fn = git_default_config;
511 config.cb = NULL;
512
513 http_is_verbose = 0;
514 normalized_url = url_normalize(url, &config.url);
515
516 git_config(urlmatch_config_entry, &config);
517 free(normalized_url);
518
519 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
520 die("curl_global_init failed");
521
522 http_proactive_auth = proactive_auth;
523
524 if (remote && remote->http_proxy)
525 curl_http_proxy = xstrdup(remote->http_proxy);
526
527 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
528 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
529
530 #ifdef USE_CURL_MULTI
531 {
532 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
533 if (http_max_requests != NULL)
534 max_requests = atoi(http_max_requests);
535 }
536
537 curlm = curl_multi_init();
538 if (!curlm)
539 die("curl_multi_init failed");
540 #endif
541
542 if (getenv("GIT_SSL_NO_VERIFY"))
543 curl_ssl_verify = 0;
544
545 set_from_env(&ssl_cert, "GIT_SSL_CERT");
546 #if LIBCURL_VERSION_NUM >= 0x070903
547 set_from_env(&ssl_key, "GIT_SSL_KEY");
548 #endif
549 #if LIBCURL_VERSION_NUM >= 0x070908
550 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
551 #endif
552 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
553
554 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
555
556 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
557 if (low_speed_limit != NULL)
558 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
559 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
560 if (low_speed_time != NULL)
561 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
562
563 if (curl_ssl_verify == -1)
564 curl_ssl_verify = 1;
565
566 curl_session_count = 0;
567 #ifdef USE_CURL_MULTI
568 if (max_requests < 1)
569 max_requests = DEFAULT_MAX_REQUESTS;
570 #endif
571
572 if (getenv("GIT_CURL_FTP_NO_EPSV"))
573 curl_ftp_no_epsv = 1;
574
575 if (url) {
576 credential_from_url(&http_auth, url);
577 if (!ssl_cert_password_required &&
578 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
579 starts_with(url, "https://"))
580 ssl_cert_password_required = 1;
581 }
582
583 #ifndef NO_CURL_EASY_DUPHANDLE
584 curl_default = get_curl_handle();
585 #endif
586 }
587
588 void http_cleanup(void)
589 {
590 struct active_request_slot *slot = active_queue_head;
591
592 while (slot != NULL) {
593 struct active_request_slot *next = slot->next;
594 if (slot->curl != NULL) {
595 #ifdef USE_CURL_MULTI
596 curl_multi_remove_handle(curlm, slot->curl);
597 #endif
598 curl_easy_cleanup(slot->curl);
599 }
600 free(slot);
601 slot = next;
602 }
603 active_queue_head = NULL;
604
605 #ifndef NO_CURL_EASY_DUPHANDLE
606 curl_easy_cleanup(curl_default);
607 #endif
608
609 #ifdef USE_CURL_MULTI
610 curl_multi_cleanup(curlm);
611 #endif
612 curl_global_cleanup();
613
614 curl_slist_free_all(pragma_header);
615 pragma_header = NULL;
616
617 curl_slist_free_all(no_pragma_header);
618 no_pragma_header = NULL;
619
620 if (curl_http_proxy) {
621 free((void *)curl_http_proxy);
622 curl_http_proxy = NULL;
623 }
624
625 if (cert_auth.password != NULL) {
626 memset(cert_auth.password, 0, strlen(cert_auth.password));
627 free(cert_auth.password);
628 cert_auth.password = NULL;
629 }
630 ssl_cert_password_required = 0;
631
632 free(cached_accept_language);
633 cached_accept_language = NULL;
634 }
635
636 struct active_request_slot *get_active_slot(void)
637 {
638 struct active_request_slot *slot = active_queue_head;
639 struct active_request_slot *newslot;
640
641 #ifdef USE_CURL_MULTI
642 int num_transfers;
643
644 /* Wait for a slot to open up if the queue is full */
645 while (active_requests >= max_requests) {
646 curl_multi_perform(curlm, &num_transfers);
647 if (num_transfers < active_requests)
648 process_curl_messages();
649 }
650 #endif
651
652 while (slot != NULL && slot->in_use)
653 slot = slot->next;
654
655 if (slot == NULL) {
656 newslot = xmalloc(sizeof(*newslot));
657 newslot->curl = NULL;
658 newslot->in_use = 0;
659 newslot->next = NULL;
660
661 slot = active_queue_head;
662 if (slot == NULL) {
663 active_queue_head = newslot;
664 } else {
665 while (slot->next != NULL)
666 slot = slot->next;
667 slot->next = newslot;
668 }
669 slot = newslot;
670 }
671
672 if (slot->curl == NULL) {
673 #ifdef NO_CURL_EASY_DUPHANDLE
674 slot->curl = get_curl_handle();
675 #else
676 slot->curl = curl_easy_duphandle(curl_default);
677 #endif
678 curl_session_count++;
679 }
680
681 active_requests++;
682 slot->in_use = 1;
683 slot->results = NULL;
684 slot->finished = NULL;
685 slot->callback_data = NULL;
686 slot->callback_func = NULL;
687 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
688 if (curl_save_cookies)
689 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
690 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
691 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
692 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
693 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
694 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
695 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
696 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
697 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
698 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
699 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
700
701 #if LIBCURL_VERSION_NUM >= 0x070a08
702 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
703 #endif
704 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
705 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
706 #endif
707 if (http_auth.password)
708 init_curl_http_auth(slot->curl);
709
710 return slot;
711 }
712
713 int start_active_slot(struct active_request_slot *slot)
714 {
715 #ifdef USE_CURL_MULTI
716 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
717 int num_transfers;
718
719 if (curlm_result != CURLM_OK &&
720 curlm_result != CURLM_CALL_MULTI_PERFORM) {
721 active_requests--;
722 slot->in_use = 0;
723 return 0;
724 }
725
726 /*
727 * We know there must be something to do, since we just added
728 * something.
729 */
730 curl_multi_perform(curlm, &num_transfers);
731 #endif
732 return 1;
733 }
734
735 #ifdef USE_CURL_MULTI
736 struct fill_chain {
737 void *data;
738 int (*fill)(void *);
739 struct fill_chain *next;
740 };
741
742 static struct fill_chain *fill_cfg;
743
744 void add_fill_function(void *data, int (*fill)(void *))
745 {
746 struct fill_chain *new = xmalloc(sizeof(*new));
747 struct fill_chain **linkp = &fill_cfg;
748 new->data = data;
749 new->fill = fill;
750 new->next = NULL;
751 while (*linkp)
752 linkp = &(*linkp)->next;
753 *linkp = new;
754 }
755
756 void fill_active_slots(void)
757 {
758 struct active_request_slot *slot = active_queue_head;
759
760 while (active_requests < max_requests) {
761 struct fill_chain *fill;
762 for (fill = fill_cfg; fill; fill = fill->next)
763 if (fill->fill(fill->data))
764 break;
765
766 if (!fill)
767 break;
768 }
769
770 while (slot != NULL) {
771 if (!slot->in_use && slot->curl != NULL
772 && curl_session_count > min_curl_sessions) {
773 curl_easy_cleanup(slot->curl);
774 slot->curl = NULL;
775 curl_session_count--;
776 }
777 slot = slot->next;
778 }
779 }
780
781 void step_active_slots(void)
782 {
783 int num_transfers;
784 CURLMcode curlm_result;
785
786 do {
787 curlm_result = curl_multi_perform(curlm, &num_transfers);
788 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
789 if (num_transfers < active_requests) {
790 process_curl_messages();
791 fill_active_slots();
792 }
793 }
794 #endif
795
796 void run_active_slot(struct active_request_slot *slot)
797 {
798 #ifdef USE_CURL_MULTI
799 fd_set readfds;
800 fd_set writefds;
801 fd_set excfds;
802 int max_fd;
803 struct timeval select_timeout;
804 int finished = 0;
805
806 slot->finished = &finished;
807 while (!finished) {
808 step_active_slots();
809
810 if (slot->in_use) {
811 #if LIBCURL_VERSION_NUM >= 0x070f04
812 long curl_timeout;
813 curl_multi_timeout(curlm, &curl_timeout);
814 if (curl_timeout == 0) {
815 continue;
816 } else if (curl_timeout == -1) {
817 select_timeout.tv_sec = 0;
818 select_timeout.tv_usec = 50000;
819 } else {
820 select_timeout.tv_sec = curl_timeout / 1000;
821 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
822 }
823 #else
824 select_timeout.tv_sec = 0;
825 select_timeout.tv_usec = 50000;
826 #endif
827
828 max_fd = -1;
829 FD_ZERO(&readfds);
830 FD_ZERO(&writefds);
831 FD_ZERO(&excfds);
832 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
833
834 /*
835 * It can happen that curl_multi_timeout returns a pathologically
836 * long timeout when curl_multi_fdset returns no file descriptors
837 * to read. See commit message for more details.
838 */
839 if (max_fd < 0 &&
840 (select_timeout.tv_sec > 0 ||
841 select_timeout.tv_usec > 50000)) {
842 select_timeout.tv_sec = 0;
843 select_timeout.tv_usec = 50000;
844 }
845
846 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
847 }
848 }
849 #else
850 while (slot->in_use) {
851 slot->curl_result = curl_easy_perform(slot->curl);
852 finish_active_slot(slot);
853 }
854 #endif
855 }
856
857 static void release_active_slot(struct active_request_slot *slot)
858 {
859 closedown_active_slot(slot);
860 if (slot->curl && curl_session_count > min_curl_sessions) {
861 #ifdef USE_CURL_MULTI
862 curl_multi_remove_handle(curlm, slot->curl);
863 #endif
864 curl_easy_cleanup(slot->curl);
865 slot->curl = NULL;
866 curl_session_count--;
867 }
868 #ifdef USE_CURL_MULTI
869 fill_active_slots();
870 #endif
871 }
872
873 void finish_all_active_slots(void)
874 {
875 struct active_request_slot *slot = active_queue_head;
876
877 while (slot != NULL)
878 if (slot->in_use) {
879 run_active_slot(slot);
880 slot = active_queue_head;
881 } else {
882 slot = slot->next;
883 }
884 }
885
886 /* Helpers for modifying and creating URLs */
887 static inline int needs_quote(int ch)
888 {
889 if (((ch >= 'A') && (ch <= 'Z'))
890 || ((ch >= 'a') && (ch <= 'z'))
891 || ((ch >= '0') && (ch <= '9'))
892 || (ch == '/')
893 || (ch == '-')
894 || (ch == '.'))
895 return 0;
896 return 1;
897 }
898
899 static char *quote_ref_url(const char *base, const char *ref)
900 {
901 struct strbuf buf = STRBUF_INIT;
902 const char *cp;
903 int ch;
904
905 end_url_with_slash(&buf, base);
906
907 for (cp = ref; (ch = *cp) != 0; cp++)
908 if (needs_quote(ch))
909 strbuf_addf(&buf, "%%%02x", ch);
910 else
911 strbuf_addch(&buf, *cp);
912
913 return strbuf_detach(&buf, NULL);
914 }
915
916 void append_remote_object_url(struct strbuf *buf, const char *url,
917 const char *hex,
918 int only_two_digit_prefix)
919 {
920 end_url_with_slash(buf, url);
921
922 strbuf_addf(buf, "objects/%.*s/", 2, hex);
923 if (!only_two_digit_prefix)
924 strbuf_addf(buf, "%s", hex+2);
925 }
926
927 char *get_remote_object_url(const char *url, const char *hex,
928 int only_two_digit_prefix)
929 {
930 struct strbuf buf = STRBUF_INIT;
931 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
932 return strbuf_detach(&buf, NULL);
933 }
934
935 static int handle_curl_result(struct slot_results *results)
936 {
937 /*
938 * If we see a failing http code with CURLE_OK, we have turned off
939 * FAILONERROR (to keep the server's custom error response), and should
940 * translate the code into failure here.
941 */
942 if (results->curl_result == CURLE_OK &&
943 results->http_code >= 400) {
944 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
945 /*
946 * Normally curl will already have put the "reason phrase"
947 * from the server into curl_errorstr; unfortunately without
948 * FAILONERROR it is lost, so we can give only the numeric
949 * status code.
950 */
951 snprintf(curl_errorstr, sizeof(curl_errorstr),
952 "The requested URL returned error: %ld",
953 results->http_code);
954 }
955
956 if (results->curl_result == CURLE_OK) {
957 credential_approve(&http_auth);
958 return HTTP_OK;
959 } else if (missing_target(results))
960 return HTTP_MISSING_TARGET;
961 else if (results->http_code == 401) {
962 if (http_auth.username && http_auth.password) {
963 credential_reject(&http_auth);
964 return HTTP_NOAUTH;
965 } else {
966 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
967 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
968 #endif
969 return HTTP_REAUTH;
970 }
971 } else {
972 #if LIBCURL_VERSION_NUM >= 0x070c00
973 if (!curl_errorstr[0])
974 strlcpy(curl_errorstr,
975 curl_easy_strerror(results->curl_result),
976 sizeof(curl_errorstr));
977 #endif
978 return HTTP_ERROR;
979 }
980 }
981
982 int run_one_slot(struct active_request_slot *slot,
983 struct slot_results *results)
984 {
985 slot->results = results;
986 if (!start_active_slot(slot)) {
987 snprintf(curl_errorstr, sizeof(curl_errorstr),
988 "failed to start HTTP request");
989 return HTTP_START_FAILED;
990 }
991
992 run_active_slot(slot);
993 return handle_curl_result(results);
994 }
995
996 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
997 {
998 char *ptr;
999 CURLcode ret;
1000
1001 strbuf_reset(buf);
1002 ret = curl_easy_getinfo(curl, info, &ptr);
1003 if (!ret && ptr)
1004 strbuf_addstr(buf, ptr);
1005 return ret;
1006 }
1007
1008 /*
1009 * Check for and extract a content-type parameter. "raw"
1010 * should be positioned at the start of the potential
1011 * parameter, with any whitespace already removed.
1012 *
1013 * "name" is the name of the parameter. The value is appended
1014 * to "out".
1015 */
1016 static int extract_param(const char *raw, const char *name,
1017 struct strbuf *out)
1018 {
1019 size_t len = strlen(name);
1020
1021 if (strncasecmp(raw, name, len))
1022 return -1;
1023 raw += len;
1024
1025 if (*raw != '=')
1026 return -1;
1027 raw++;
1028
1029 while (*raw && !isspace(*raw) && *raw != ';')
1030 strbuf_addch(out, *raw++);
1031 return 0;
1032 }
1033
1034 /*
1035 * Extract a normalized version of the content type, with any
1036 * spaces suppressed, all letters lowercased, and no trailing ";"
1037 * or parameters.
1038 *
1039 * Note that we will silently remove even invalid whitespace. For
1040 * example, "text / plain" is specifically forbidden by RFC 2616,
1041 * but "text/plain" is the only reasonable output, and this keeps
1042 * our code simple.
1043 *
1044 * If the "charset" argument is not NULL, store the value of any
1045 * charset parameter there.
1046 *
1047 * Example:
1048 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1049 * "text / plain" -> "text/plain"
1050 */
1051 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1052 struct strbuf *charset)
1053 {
1054 const char *p;
1055
1056 strbuf_reset(type);
1057 strbuf_grow(type, raw->len);
1058 for (p = raw->buf; *p; p++) {
1059 if (isspace(*p))
1060 continue;
1061 if (*p == ';') {
1062 p++;
1063 break;
1064 }
1065 strbuf_addch(type, tolower(*p));
1066 }
1067
1068 if (!charset)
1069 return;
1070
1071 strbuf_reset(charset);
1072 while (*p) {
1073 while (isspace(*p) || *p == ';')
1074 p++;
1075 if (!extract_param(p, "charset", charset))
1076 return;
1077 while (*p && !isspace(*p))
1078 p++;
1079 }
1080
1081 if (!charset->len && starts_with(type->buf, "text/"))
1082 strbuf_addstr(charset, "ISO-8859-1");
1083 }
1084
1085 static void write_accept_language(struct strbuf *buf)
1086 {
1087 /*
1088 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1089 * that, q-value will be smaller than 0.001, the minimum q-value the
1090 * HTTP specification allows. See
1091 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1092 */
1093 const int MAX_DECIMAL_PLACES = 3;
1094 const int MAX_LANGUAGE_TAGS = 1000;
1095 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1096 char **language_tags = NULL;
1097 int num_langs = 0;
1098 const char *s = get_preferred_languages();
1099 int i;
1100 struct strbuf tag = STRBUF_INIT;
1101
1102 /* Don't add Accept-Language header if no language is preferred. */
1103 if (!s)
1104 return;
1105
1106 /*
1107 * Split the colon-separated string of preferred languages into
1108 * language_tags array.
1109 */
1110 do {
1111 /* collect language tag */
1112 for (; *s && (isalnum(*s) || *s == '_'); s++)
1113 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1114
1115 /* skip .codeset, @modifier and any other unnecessary parts */
1116 while (*s && *s != ':')
1117 s++;
1118
1119 if (tag.len) {
1120 num_langs++;
1121 REALLOC_ARRAY(language_tags, num_langs);
1122 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1123 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1124 break;
1125 }
1126 } while (*s++);
1127
1128 /* write Accept-Language header into buf */
1129 if (num_langs) {
1130 int last_buf_len = 0;
1131 int max_q;
1132 int decimal_places;
1133 char q_format[32];
1134
1135 /* add '*' */
1136 REALLOC_ARRAY(language_tags, num_langs + 1);
1137 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1138
1139 /* compute decimal_places */
1140 for (max_q = 1, decimal_places = 0;
1141 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1142 decimal_places++, max_q *= 10)
1143 ;
1144
1145 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1146
1147 strbuf_addstr(buf, "Accept-Language: ");
1148
1149 for (i = 0; i < num_langs; i++) {
1150 if (i > 0)
1151 strbuf_addstr(buf, ", ");
1152
1153 strbuf_addstr(buf, language_tags[i]);
1154
1155 if (i > 0)
1156 strbuf_addf(buf, q_format, max_q - i);
1157
1158 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1159 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1160 break;
1161 }
1162
1163 last_buf_len = buf->len;
1164 }
1165 }
1166
1167 /* free language tags -- last one is a static '*' */
1168 for (i = 0; i < num_langs - 1; i++)
1169 free(language_tags[i]);
1170 free(language_tags);
1171 }
1172
1173 /*
1174 * Get an Accept-Language header which indicates user's preferred languages.
1175 *
1176 * Examples:
1177 * LANGUAGE= -> ""
1178 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1179 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1180 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1181 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1182 * LANGUAGE= LANG=C -> ""
1183 */
1184 static const char *get_accept_language(void)
1185 {
1186 if (!cached_accept_language) {
1187 struct strbuf buf = STRBUF_INIT;
1188 write_accept_language(&buf);
1189 if (buf.len > 0)
1190 cached_accept_language = strbuf_detach(&buf, NULL);
1191 }
1192
1193 return cached_accept_language;
1194 }
1195
1196 static void http_opt_request_remainder(CURL *curl, off_t pos)
1197 {
1198 char buf[128];
1199 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1200 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1201 }
1202
1203 /* http_request() targets */
1204 #define HTTP_REQUEST_STRBUF 0
1205 #define HTTP_REQUEST_FILE 1
1206
1207 static int http_request(const char *url,
1208 void *result, int target,
1209 const struct http_get_options *options)
1210 {
1211 struct active_request_slot *slot;
1212 struct slot_results results;
1213 struct curl_slist *headers = NULL;
1214 struct strbuf buf = STRBUF_INIT;
1215 const char *accept_language;
1216 int ret;
1217
1218 slot = get_active_slot();
1219 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1220
1221 if (result == NULL) {
1222 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1223 } else {
1224 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1225 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1226
1227 if (target == HTTP_REQUEST_FILE) {
1228 off_t posn = ftello(result);
1229 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1230 fwrite);
1231 if (posn > 0)
1232 http_opt_request_remainder(slot->curl, posn);
1233 } else
1234 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1235 fwrite_buffer);
1236 }
1237
1238 accept_language = get_accept_language();
1239
1240 if (accept_language)
1241 headers = curl_slist_append(headers, accept_language);
1242
1243 strbuf_addstr(&buf, "Pragma:");
1244 if (options && options->no_cache)
1245 strbuf_addstr(&buf, " no-cache");
1246 if (options && options->keep_error)
1247 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1248
1249 headers = curl_slist_append(headers, buf.buf);
1250
1251 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1252 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1253 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1254
1255 ret = run_one_slot(slot, &results);
1256
1257 if (options && options->content_type) {
1258 struct strbuf raw = STRBUF_INIT;
1259 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1260 extract_content_type(&raw, options->content_type,
1261 options->charset);
1262 strbuf_release(&raw);
1263 }
1264
1265 if (options && options->effective_url)
1266 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1267 options->effective_url);
1268
1269 curl_slist_free_all(headers);
1270 strbuf_release(&buf);
1271
1272 return ret;
1273 }
1274
1275 /*
1276 * Update the "base" url to a more appropriate value, as deduced by
1277 * redirects seen when requesting a URL starting with "url".
1278 *
1279 * The "asked" parameter is a URL that we asked curl to access, and must begin
1280 * with "base".
1281 *
1282 * The "got" parameter is the URL that curl reported to us as where we ended
1283 * up.
1284 *
1285 * Returns 1 if we updated the base url, 0 otherwise.
1286 *
1287 * Our basic strategy is to compare "base" and "asked" to find the bits
1288 * specific to our request. We then strip those bits off of "got" to yield the
1289 * new base. So for example, if our base is "http://example.com/foo.git",
1290 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1291 * with "https://other.example.com/foo.git/info/refs". We would want the
1292 * new URL to become "https://other.example.com/foo.git".
1293 *
1294 * Note that this assumes a sane redirect scheme. It's entirely possible
1295 * in the example above to end up at a URL that does not even end in
1296 * "info/refs". In such a case we simply punt, as there is not much we can
1297 * do (and such a scheme is unlikely to represent a real git repository,
1298 * which means we are likely about to abort anyway).
1299 */
1300 static int update_url_from_redirect(struct strbuf *base,
1301 const char *asked,
1302 const struct strbuf *got)
1303 {
1304 const char *tail;
1305 size_t tail_len;
1306
1307 if (!strcmp(asked, got->buf))
1308 return 0;
1309
1310 if (!skip_prefix(asked, base->buf, &tail))
1311 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1312 asked, base->buf);
1313
1314 tail_len = strlen(tail);
1315
1316 if (got->len < tail_len ||
1317 strcmp(tail, got->buf + got->len - tail_len))
1318 return 0; /* insane redirect scheme */
1319
1320 strbuf_reset(base);
1321 strbuf_add(base, got->buf, got->len - tail_len);
1322 return 1;
1323 }
1324
1325 static int http_request_reauth(const char *url,
1326 void *result, int target,
1327 struct http_get_options *options)
1328 {
1329 int ret = http_request(url, result, target, options);
1330
1331 if (options && options->effective_url && options->base_url) {
1332 if (update_url_from_redirect(options->base_url,
1333 url, options->effective_url)) {
1334 credential_from_url(&http_auth, options->base_url->buf);
1335 url = options->effective_url->buf;
1336 }
1337 }
1338
1339 if (ret != HTTP_REAUTH)
1340 return ret;
1341
1342 /*
1343 * If we are using KEEP_ERROR, the previous request may have
1344 * put cruft into our output stream; we should clear it out before
1345 * making our next request. We only know how to do this for
1346 * the strbuf case, but that is enough to satisfy current callers.
1347 */
1348 if (options && options->keep_error) {
1349 switch (target) {
1350 case HTTP_REQUEST_STRBUF:
1351 strbuf_reset(result);
1352 break;
1353 default:
1354 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1355 }
1356 }
1357
1358 credential_fill(&http_auth);
1359
1360 return http_request(url, result, target, options);
1361 }
1362
1363 int http_get_strbuf(const char *url,
1364 struct strbuf *result,
1365 struct http_get_options *options)
1366 {
1367 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1368 }
1369
1370 /*
1371 * Downloads a URL and stores the result in the given file.
1372 *
1373 * If a previous interrupted download is detected (i.e. a previous temporary
1374 * file is still around) the download is resumed.
1375 */
1376 static int http_get_file(const char *url, const char *filename,
1377 struct http_get_options *options)
1378 {
1379 int ret;
1380 struct strbuf tmpfile = STRBUF_INIT;
1381 FILE *result;
1382
1383 strbuf_addf(&tmpfile, "%s.temp", filename);
1384 result = fopen(tmpfile.buf, "a");
1385 if (!result) {
1386 error("Unable to open local file %s", tmpfile.buf);
1387 ret = HTTP_ERROR;
1388 goto cleanup;
1389 }
1390
1391 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1392 fclose(result);
1393
1394 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1395 ret = HTTP_ERROR;
1396 cleanup:
1397 strbuf_release(&tmpfile);
1398 return ret;
1399 }
1400
1401 int http_fetch_ref(const char *base, struct ref *ref)
1402 {
1403 struct http_get_options options = {0};
1404 char *url;
1405 struct strbuf buffer = STRBUF_INIT;
1406 int ret = -1;
1407
1408 options.no_cache = 1;
1409
1410 url = quote_ref_url(base, ref->name);
1411 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1412 strbuf_rtrim(&buffer);
1413 if (buffer.len == 40)
1414 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1415 else if (starts_with(buffer.buf, "ref: ")) {
1416 ref->symref = xstrdup(buffer.buf + 5);
1417 ret = 0;
1418 }
1419 }
1420
1421 strbuf_release(&buffer);
1422 free(url);
1423 return ret;
1424 }
1425
1426 /* Helpers for fetching packs */
1427 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1428 {
1429 char *url, *tmp;
1430 struct strbuf buf = STRBUF_INIT;
1431
1432 if (http_is_verbose)
1433 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1434
1435 end_url_with_slash(&buf, base_url);
1436 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1437 url = strbuf_detach(&buf, NULL);
1438
1439 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1440 tmp = strbuf_detach(&buf, NULL);
1441
1442 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1443 error("Unable to get pack index %s", url);
1444 free(tmp);
1445 tmp = NULL;
1446 }
1447
1448 free(url);
1449 return tmp;
1450 }
1451
1452 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1453 unsigned char *sha1, const char *base_url)
1454 {
1455 struct packed_git *new_pack;
1456 char *tmp_idx = NULL;
1457 int ret;
1458
1459 if (has_pack_index(sha1)) {
1460 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1461 if (!new_pack)
1462 return -1; /* parse_pack_index() already issued error message */
1463 goto add_pack;
1464 }
1465
1466 tmp_idx = fetch_pack_index(sha1, base_url);
1467 if (!tmp_idx)
1468 return -1;
1469
1470 new_pack = parse_pack_index(sha1, tmp_idx);
1471 if (!new_pack) {
1472 unlink(tmp_idx);
1473 free(tmp_idx);
1474
1475 return -1; /* parse_pack_index() already issued error message */
1476 }
1477
1478 ret = verify_pack_index(new_pack);
1479 if (!ret) {
1480 close_pack_index(new_pack);
1481 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1482 }
1483 free(tmp_idx);
1484 if (ret)
1485 return -1;
1486
1487 add_pack:
1488 new_pack->next = *packs_head;
1489 *packs_head = new_pack;
1490 return 0;
1491 }
1492
1493 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1494 {
1495 struct http_get_options options = {0};
1496 int ret = 0, i = 0;
1497 char *url, *data;
1498 struct strbuf buf = STRBUF_INIT;
1499 unsigned char sha1[20];
1500
1501 end_url_with_slash(&buf, base_url);
1502 strbuf_addstr(&buf, "objects/info/packs");
1503 url = strbuf_detach(&buf, NULL);
1504
1505 options.no_cache = 1;
1506 ret = http_get_strbuf(url, &buf, &options);
1507 if (ret != HTTP_OK)
1508 goto cleanup;
1509
1510 data = buf.buf;
1511 while (i < buf.len) {
1512 switch (data[i]) {
1513 case 'P':
1514 i++;
1515 if (i + 52 <= buf.len &&
1516 starts_with(data + i, " pack-") &&
1517 starts_with(data + i + 46, ".pack\n")) {
1518 get_sha1_hex(data + i + 6, sha1);
1519 fetch_and_setup_pack_index(packs_head, sha1,
1520 base_url);
1521 i += 51;
1522 break;
1523 }
1524 default:
1525 while (i < buf.len && data[i] != '\n')
1526 i++;
1527 }
1528 i++;
1529 }
1530
1531 cleanup:
1532 free(url);
1533 return ret;
1534 }
1535
1536 void release_http_pack_request(struct http_pack_request *preq)
1537 {
1538 if (preq->packfile != NULL) {
1539 fclose(preq->packfile);
1540 preq->packfile = NULL;
1541 }
1542 preq->slot = NULL;
1543 free(preq->url);
1544 free(preq);
1545 }
1546
1547 int finish_http_pack_request(struct http_pack_request *preq)
1548 {
1549 struct packed_git **lst;
1550 struct packed_git *p = preq->target;
1551 char *tmp_idx;
1552 size_t len;
1553 struct child_process ip = CHILD_PROCESS_INIT;
1554 const char *ip_argv[8];
1555
1556 close_pack_index(p);
1557
1558 fclose(preq->packfile);
1559 preq->packfile = NULL;
1560
1561 lst = preq->lst;
1562 while (*lst != p)
1563 lst = &((*lst)->next);
1564 *lst = (*lst)->next;
1565
1566 if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1567 die("BUG: pack tmpfile does not end in .pack.temp?");
1568 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1569
1570 ip_argv[0] = "index-pack";
1571 ip_argv[1] = "-o";
1572 ip_argv[2] = tmp_idx;
1573 ip_argv[3] = preq->tmpfile;
1574 ip_argv[4] = NULL;
1575
1576 ip.argv = ip_argv;
1577 ip.git_cmd = 1;
1578 ip.no_stdin = 1;
1579 ip.no_stdout = 1;
1580
1581 if (run_command(&ip)) {
1582 unlink(preq->tmpfile);
1583 unlink(tmp_idx);
1584 free(tmp_idx);
1585 return -1;
1586 }
1587
1588 unlink(sha1_pack_index_name(p->sha1));
1589
1590 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1591 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1592 free(tmp_idx);
1593 return -1;
1594 }
1595
1596 install_packed_git(p);
1597 free(tmp_idx);
1598 return 0;
1599 }
1600
1601 struct http_pack_request *new_http_pack_request(
1602 struct packed_git *target, const char *base_url)
1603 {
1604 off_t prev_posn = 0;
1605 struct strbuf buf = STRBUF_INIT;
1606 struct http_pack_request *preq;
1607
1608 preq = xcalloc(1, sizeof(*preq));
1609 preq->target = target;
1610
1611 end_url_with_slash(&buf, base_url);
1612 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1613 sha1_to_hex(target->sha1));
1614 preq->url = strbuf_detach(&buf, NULL);
1615
1616 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1617 sha1_pack_name(target->sha1));
1618 preq->packfile = fopen(preq->tmpfile, "a");
1619 if (!preq->packfile) {
1620 error("Unable to open local file %s for pack",
1621 preq->tmpfile);
1622 goto abort;
1623 }
1624
1625 preq->slot = get_active_slot();
1626 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1627 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1628 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1629 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1630 no_pragma_header);
1631
1632 /*
1633 * If there is data present from a previous transfer attempt,
1634 * resume where it left off
1635 */
1636 prev_posn = ftello(preq->packfile);
1637 if (prev_posn>0) {
1638 if (http_is_verbose)
1639 fprintf(stderr,
1640 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
1641 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
1642 http_opt_request_remainder(preq->slot->curl, prev_posn);
1643 }
1644
1645 return preq;
1646
1647 abort:
1648 free(preq->url);
1649 free(preq);
1650 return NULL;
1651 }
1652
1653 /* Helpers for fetching objects (loose) */
1654 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1655 void *data)
1656 {
1657 unsigned char expn[4096];
1658 size_t size = eltsize * nmemb;
1659 int posn = 0;
1660 struct http_object_request *freq =
1661 (struct http_object_request *)data;
1662 do {
1663 ssize_t retval = xwrite(freq->localfile,
1664 (char *) ptr + posn, size - posn);
1665 if (retval < 0)
1666 return posn;
1667 posn += retval;
1668 } while (posn < size);
1669
1670 freq->stream.avail_in = size;
1671 freq->stream.next_in = (void *)ptr;
1672 do {
1673 freq->stream.next_out = expn;
1674 freq->stream.avail_out = sizeof(expn);
1675 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1676 git_SHA1_Update(&freq->c, expn,
1677 sizeof(expn) - freq->stream.avail_out);
1678 } while (freq->stream.avail_in && freq->zret == Z_OK);
1679 return size;
1680 }
1681
1682 struct http_object_request *new_http_object_request(const char *base_url,
1683 unsigned char *sha1)
1684 {
1685 char *hex = sha1_to_hex(sha1);
1686 const char *filename;
1687 char prevfile[PATH_MAX];
1688 int prevlocal;
1689 char prev_buf[PREV_BUF_SIZE];
1690 ssize_t prev_read = 0;
1691 off_t prev_posn = 0;
1692 struct http_object_request *freq;
1693
1694 freq = xcalloc(1, sizeof(*freq));
1695 hashcpy(freq->sha1, sha1);
1696 freq->localfile = -1;
1697
1698 filename = sha1_file_name(sha1);
1699 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1700 "%s.temp", filename);
1701
1702 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1703 unlink_or_warn(prevfile);
1704 rename(freq->tmpfile, prevfile);
1705 unlink_or_warn(freq->tmpfile);
1706
1707 if (freq->localfile != -1)
1708 error("fd leakage in start: %d", freq->localfile);
1709 freq->localfile = open(freq->tmpfile,
1710 O_WRONLY | O_CREAT | O_EXCL, 0666);
1711 /*
1712 * This could have failed due to the "lazy directory creation";
1713 * try to mkdir the last path component.
1714 */
1715 if (freq->localfile < 0 && errno == ENOENT) {
1716 char *dir = strrchr(freq->tmpfile, '/');
1717 if (dir) {
1718 *dir = 0;
1719 mkdir(freq->tmpfile, 0777);
1720 *dir = '/';
1721 }
1722 freq->localfile = open(freq->tmpfile,
1723 O_WRONLY | O_CREAT | O_EXCL, 0666);
1724 }
1725
1726 if (freq->localfile < 0) {
1727 error("Couldn't create temporary file %s: %s",
1728 freq->tmpfile, strerror(errno));
1729 goto abort;
1730 }
1731
1732 git_inflate_init(&freq->stream);
1733
1734 git_SHA1_Init(&freq->c);
1735
1736 freq->url = get_remote_object_url(base_url, hex, 0);
1737
1738 /*
1739 * If a previous temp file is present, process what was already
1740 * fetched.
1741 */
1742 prevlocal = open(prevfile, O_RDONLY);
1743 if (prevlocal != -1) {
1744 do {
1745 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1746 if (prev_read>0) {
1747 if (fwrite_sha1_file(prev_buf,
1748 1,
1749 prev_read,
1750 freq) == prev_read) {
1751 prev_posn += prev_read;
1752 } else {
1753 prev_read = -1;
1754 }
1755 }
1756 } while (prev_read > 0);
1757 close(prevlocal);
1758 }
1759 unlink_or_warn(prevfile);
1760
1761 /*
1762 * Reset inflate/SHA1 if there was an error reading the previous temp
1763 * file; also rewind to the beginning of the local file.
1764 */
1765 if (prev_read == -1) {
1766 memset(&freq->stream, 0, sizeof(freq->stream));
1767 git_inflate_init(&freq->stream);
1768 git_SHA1_Init(&freq->c);
1769 if (prev_posn>0) {
1770 prev_posn = 0;
1771 lseek(freq->localfile, 0, SEEK_SET);
1772 if (ftruncate(freq->localfile, 0) < 0) {
1773 error("Couldn't truncate temporary file %s: %s",
1774 freq->tmpfile, strerror(errno));
1775 goto abort;
1776 }
1777 }
1778 }
1779
1780 freq->slot = get_active_slot();
1781
1782 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1783 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1784 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1785 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1786 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1787
1788 /*
1789 * If we have successfully processed data from a previous fetch
1790 * attempt, only fetch the data we don't already have.
1791 */
1792 if (prev_posn>0) {
1793 if (http_is_verbose)
1794 fprintf(stderr,
1795 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
1796 hex, (uintmax_t)prev_posn);
1797 http_opt_request_remainder(freq->slot->curl, prev_posn);
1798 }
1799
1800 return freq;
1801
1802 abort:
1803 free(freq->url);
1804 free(freq);
1805 return NULL;
1806 }
1807
1808 void process_http_object_request(struct http_object_request *freq)
1809 {
1810 if (freq->slot == NULL)
1811 return;
1812 freq->curl_result = freq->slot->curl_result;
1813 freq->http_code = freq->slot->http_code;
1814 freq->slot = NULL;
1815 }
1816
1817 int finish_http_object_request(struct http_object_request *freq)
1818 {
1819 struct stat st;
1820
1821 close(freq->localfile);
1822 freq->localfile = -1;
1823
1824 process_http_object_request(freq);
1825
1826 if (freq->http_code == 416) {
1827 warning("requested range invalid; we may already have all the data.");
1828 } else if (freq->curl_result != CURLE_OK) {
1829 if (stat(freq->tmpfile, &st) == 0)
1830 if (st.st_size == 0)
1831 unlink_or_warn(freq->tmpfile);
1832 return -1;
1833 }
1834
1835 git_inflate_end(&freq->stream);
1836 git_SHA1_Final(freq->real_sha1, &freq->c);
1837 if (freq->zret != Z_STREAM_END) {
1838 unlink_or_warn(freq->tmpfile);
1839 return -1;
1840 }
1841 if (hashcmp(freq->sha1, freq->real_sha1)) {
1842 unlink_or_warn(freq->tmpfile);
1843 return -1;
1844 }
1845 freq->rename =
1846 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
1847
1848 return freq->rename;
1849 }
1850
1851 void abort_http_object_request(struct http_object_request *freq)
1852 {
1853 unlink_or_warn(freq->tmpfile);
1854
1855 release_http_object_request(freq);
1856 }
1857
1858 void release_http_object_request(struct http_object_request *freq)
1859 {
1860 if (freq->localfile != -1) {
1861 close(freq->localfile);
1862 freq->localfile = -1;
1863 }
1864 if (freq->url != NULL) {
1865 free(freq->url);
1866 freq->url = NULL;
1867 }
1868 if (freq->slot != NULL) {
1869 freq->slot->callback_func = NULL;
1870 freq->slot->callback_data = NULL;
1871 release_active_slot(freq->slot);
1872 freq->slot = NULL;
1873 }
1874 }
The Best VCS Around