?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
xread: retry after poll on EAGAIN/EWOULDBLOCK
[git.git] / http.c
blob0da9e6639832a493f932e3ba332683d3d4ae73ae
1 #include "git-compat-util.h"
2 #include "http.h"
3 #include "pack.h"
4 #include "sideband.h"
5 #include "run-command.h"
6 #include "url.h"
7 #include "urlmatch.h"
8 #include "credential.h"
9 #include "version.h"
10 #include "pkt-line.h"
11 #include "gettext.h"
12 #include "transport.h"
13
14 int active_requests;
15 int http_is_verbose;
16 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
17
18 #if LIBCURL_VERSION_NUM >= 0x070a06
19 #define LIBCURL_CAN_HANDLE_AUTH_ANY
20 #endif
21
22 static int min_curl_sessions = 1;
23 static int curl_session_count;
24 #ifdef USE_CURL_MULTI
25 static int max_requests = -1;
26 static CURLM *curlm;
27 #endif
28 #ifndef NO_CURL_EASY_DUPHANDLE
29 static CURL *curl_default;
30 #endif
31
32 #define PREV_BUF_SIZE 4096
33
34 char curl_errorstr[CURL_ERROR_SIZE];
35
36 static int curl_ssl_verify = -1;
37 static int curl_ssl_try;
38 static const char *ssl_cert;
39 static const char *ssl_cipherlist;
40 static const char *ssl_version;
41 static struct {
42 const char *name;
43 long ssl_version;
44 } sslversions[] = {
45 { "sslv2", CURL_SSLVERSION_SSLv2 },
46 { "sslv3", CURL_SSLVERSION_SSLv3 },
47 { "tlsv1", CURL_SSLVERSION_TLSv1 },
48 #if LIBCURL_VERSION_NUM >= 0x072200
49 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
50 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
51 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
52 #endif
53 };
54 #if LIBCURL_VERSION_NUM >= 0x070903
55 static const char *ssl_key;
56 #endif
57 #if LIBCURL_VERSION_NUM >= 0x070908
58 static const char *ssl_capath;
59 #endif
60 static const char *ssl_cainfo;
61 static long curl_low_speed_limit = -1;
62 static long curl_low_speed_time = -1;
63 static int curl_ftp_no_epsv;
64 static const char *curl_http_proxy;
65 static const char *curl_cookie_file;
66 static int curl_save_cookies;
67 struct credential http_auth = CREDENTIAL_INIT;
68 static int http_proactive_auth;
69 static const char *user_agent;
70
71 #if LIBCURL_VERSION_NUM >= 0x071700
72 /* Use CURLOPT_KEYPASSWD as is */
73 #elif LIBCURL_VERSION_NUM >= 0x070903
74 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
75 #else
76 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
77 #endif
78
79 static struct credential cert_auth = CREDENTIAL_INIT;
80 static int ssl_cert_password_required;
81 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
82 static unsigned long http_auth_methods = CURLAUTH_ANY;
83 #endif
84
85 static struct curl_slist *pragma_header;
86 static struct curl_slist *no_pragma_header;
87
88 static struct active_request_slot *active_queue_head;
89
90 static char *cached_accept_language;
91
92 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
93 {
94 size_t size = eltsize * nmemb;
95 struct buffer *buffer = buffer_;
96
97 if (size > buffer->buf.len - buffer->posn)
98 size = buffer->buf.len - buffer->posn;
99 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
100 buffer->posn += size;
101
102 return size;
103 }
104
105 #ifndef NO_CURL_IOCTL
106 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
107 {
108 struct buffer *buffer = clientp;
109
110 switch (cmd) {
111 case CURLIOCMD_NOP:
112 return CURLIOE_OK;
113
114 case CURLIOCMD_RESTARTREAD:
115 buffer->posn = 0;
116 return CURLIOE_OK;
117
118 default:
119 return CURLIOE_UNKNOWNCMD;
120 }
121 }
122 #endif
123
124 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
125 {
126 size_t size = eltsize * nmemb;
127 struct strbuf *buffer = buffer_;
128
129 strbuf_add(buffer, ptr, size);
130 return size;
131 }
132
133 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
134 {
135 return eltsize * nmemb;
136 }
137
138 static void closedown_active_slot(struct active_request_slot *slot)
139 {
140 active_requests--;
141 slot->in_use = 0;
142 }
143
144 static void finish_active_slot(struct active_request_slot *slot)
145 {
146 closedown_active_slot(slot);
147 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
148
149 if (slot->finished != NULL)
150 (*slot->finished) = 1;
151
152 /* Store slot results so they can be read after the slot is reused */
153 if (slot->results != NULL) {
154 slot->results->curl_result = slot->curl_result;
155 slot->results->http_code = slot->http_code;
156 #if LIBCURL_VERSION_NUM >= 0x070a08
157 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
158 &slot->results->auth_avail);
159 #else
160 slot->results->auth_avail = 0;
161 #endif
162 }
163
164 /* Run callback if appropriate */
165 if (slot->callback_func != NULL)
166 slot->callback_func(slot->callback_data);
167 }
168
169 #ifdef USE_CURL_MULTI
170 static void process_curl_messages(void)
171 {
172 int num_messages;
173 struct active_request_slot *slot;
174 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
175
176 while (curl_message != NULL) {
177 if (curl_message->msg == CURLMSG_DONE) {
178 int curl_result = curl_message->data.result;
179 slot = active_queue_head;
180 while (slot != NULL &&
181 slot->curl != curl_message->easy_handle)
182 slot = slot->next;
183 if (slot != NULL) {
184 curl_multi_remove_handle(curlm, slot->curl);
185 slot->curl_result = curl_result;
186 finish_active_slot(slot);
187 } else {
188 fprintf(stderr, "Received DONE message for unknown request!\n");
189 }
190 } else {
191 fprintf(stderr, "Unknown CURL message received: %d\n",
192 (int)curl_message->msg);
193 }
194 curl_message = curl_multi_info_read(curlm, &num_messages);
195 }
196 }
197 #endif
198
199 static int http_options(const char *var, const char *value, void *cb)
200 {
201 if (!strcmp("http.sslverify", var)) {
202 curl_ssl_verify = git_config_bool(var, value);
203 return 0;
204 }
205 if (!strcmp("http.sslcipherlist", var))
206 return git_config_string(&ssl_cipherlist, var, value);
207 if (!strcmp("http.sslversion", var))
208 return git_config_string(&ssl_version, var, value);
209 if (!strcmp("http.sslcert", var))
210 return git_config_string(&ssl_cert, var, value);
211 #if LIBCURL_VERSION_NUM >= 0x070903
212 if (!strcmp("http.sslkey", var))
213 return git_config_string(&ssl_key, var, value);
214 #endif
215 #if LIBCURL_VERSION_NUM >= 0x070908
216 if (!strcmp("http.sslcapath", var))
217 return git_config_pathname(&ssl_capath, var, value);
218 #endif
219 if (!strcmp("http.sslcainfo", var))
220 return git_config_pathname(&ssl_cainfo, var, value);
221 if (!strcmp("http.sslcertpasswordprotected", var)) {
222 ssl_cert_password_required = git_config_bool(var, value);
223 return 0;
224 }
225 if (!strcmp("http.ssltry", var)) {
226 curl_ssl_try = git_config_bool(var, value);
227 return 0;
228 }
229 if (!strcmp("http.minsessions", var)) {
230 min_curl_sessions = git_config_int(var, value);
231 #ifndef USE_CURL_MULTI
232 if (min_curl_sessions > 1)
233 min_curl_sessions = 1;
234 #endif
235 return 0;
236 }
237 #ifdef USE_CURL_MULTI
238 if (!strcmp("http.maxrequests", var)) {
239 max_requests = git_config_int(var, value);
240 return 0;
241 }
242 #endif
243 if (!strcmp("http.lowspeedlimit", var)) {
244 curl_low_speed_limit = (long)git_config_int(var, value);
245 return 0;
246 }
247 if (!strcmp("http.lowspeedtime", var)) {
248 curl_low_speed_time = (long)git_config_int(var, value);
249 return 0;
250 }
251
252 if (!strcmp("http.noepsv", var)) {
253 curl_ftp_no_epsv = git_config_bool(var, value);
254 return 0;
255 }
256 if (!strcmp("http.proxy", var))
257 return git_config_string(&curl_http_proxy, var, value);
258
259 if (!strcmp("http.cookiefile", var))
260 return git_config_string(&curl_cookie_file, var, value);
261 if (!strcmp("http.savecookies", var)) {
262 curl_save_cookies = git_config_bool(var, value);
263 return 0;
264 }
265
266 if (!strcmp("http.postbuffer", var)) {
267 http_post_buffer = git_config_int(var, value);
268 if (http_post_buffer < LARGE_PACKET_MAX)
269 http_post_buffer = LARGE_PACKET_MAX;
270 return 0;
271 }
272
273 if (!strcmp("http.useragent", var))
274 return git_config_string(&user_agent, var, value);
275
276 /* Fall back on the default ones */
277 return git_default_config(var, value, cb);
278 }
279
280 static void init_curl_http_auth(CURL *result)
281 {
282 if (!http_auth.username)
283 return;
284
285 credential_fill(&http_auth);
286
287 #if LIBCURL_VERSION_NUM >= 0x071301
288 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
289 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
290 #else
291 {
292 static struct strbuf up = STRBUF_INIT;
293 /*
294 * Note that we assume we only ever have a single set of
295 * credentials in a given program run, so we do not have
296 * to worry about updating this buffer, only setting its
297 * initial value.
298 */
299 if (!up.len)
300 strbuf_addf(&up, "%s:%s",
301 http_auth.username, http_auth.password);
302 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
303 }
304 #endif
305 }
306
307 static int has_cert_password(void)
308 {
309 if (ssl_cert == NULL || ssl_cert_password_required != 1)
310 return 0;
311 if (!cert_auth.password) {
312 cert_auth.protocol = xstrdup("cert");
313 cert_auth.username = xstrdup("");
314 cert_auth.path = xstrdup(ssl_cert);
315 credential_fill(&cert_auth);
316 }
317 return 1;
318 }
319
320 #if LIBCURL_VERSION_NUM >= 0x071900
321 static void set_curl_keepalive(CURL *c)
322 {
323 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
324 }
325
326 #elif LIBCURL_VERSION_NUM >= 0x071000
327 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
328 {
329 int ka = 1;
330 int rc;
331 socklen_t len = (socklen_t)sizeof(ka);
332
333 if (type != CURLSOCKTYPE_IPCXN)
334 return 0;
335
336 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
337 if (rc < 0)
338 warning("unable to set SO_KEEPALIVE on socket %s",
339 strerror(errno));
340
341 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
342 }
343
344 static void set_curl_keepalive(CURL *c)
345 {
346 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
347 }
348
349 #else
350 static void set_curl_keepalive(CURL *c)
351 {
352 /* not supported on older curl versions */
353 }
354 #endif
355
356 static CURL *get_curl_handle(void)
357 {
358 CURL *result = curl_easy_init();
359 long allowed_protocols = 0;
360
361 if (!result)
362 die("curl_easy_init failed");
363
364 if (!curl_ssl_verify) {
365 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
366 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
367 } else {
368 /* Verify authenticity of the peer's certificate */
369 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
370 /* The name in the cert must match whom we tried to connect */
371 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
372 }
373
374 #if LIBCURL_VERSION_NUM >= 0x070907
375 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
376 #endif
377 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
378 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
379 #endif
380
381 if (http_proactive_auth)
382 init_curl_http_auth(result);
383
384 if (getenv("GIT_SSL_VERSION"))
385 ssl_version = getenv("GIT_SSL_VERSION");
386 if (ssl_version && *ssl_version) {
387 int i;
388 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
389 if (!strcmp(ssl_version, sslversions[i].name)) {
390 curl_easy_setopt(result, CURLOPT_SSLVERSION,
391 sslversions[i].ssl_version);
392 break;
393 }
394 }
395 if (i == ARRAY_SIZE(sslversions))
396 warning("unsupported ssl version %s: using default",
397 ssl_version);
398 }
399
400 if (getenv("GIT_SSL_CIPHER_LIST"))
401 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
402 if (ssl_cipherlist != NULL && *ssl_cipherlist)
403 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
404 ssl_cipherlist);
405
406 if (ssl_cert != NULL)
407 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
408 if (has_cert_password())
409 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
410 #if LIBCURL_VERSION_NUM >= 0x070903
411 if (ssl_key != NULL)
412 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
413 #endif
414 #if LIBCURL_VERSION_NUM >= 0x070908
415 if (ssl_capath != NULL)
416 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
417 #endif
418 if (ssl_cainfo != NULL)
419 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
420
421 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
422 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
423 curl_low_speed_limit);
424 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
425 curl_low_speed_time);
426 }
427
428 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
429 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
430 #if LIBCURL_VERSION_NUM >= 0x071301
431 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
432 #elif LIBCURL_VERSION_NUM >= 0x071101
433 curl_easy_setopt(result, CURLOPT_POST301, 1);
434 #endif
435 #if LIBCURL_VERSION_NUM >= 0x071304
436 if (is_transport_allowed("http"))
437 allowed_protocols |= CURLPROTO_HTTP;
438 if (is_transport_allowed("https"))
439 allowed_protocols |= CURLPROTO_HTTPS;
440 if (is_transport_allowed("ftp"))
441 allowed_protocols |= CURLPROTO_FTP;
442 if (is_transport_allowed("ftps"))
443 allowed_protocols |= CURLPROTO_FTPS;
444 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
445 #else
446 if (transport_restrict_protocols())
447 warning("protocol restrictions not applied to curl redirects because\n"
448 "your curl version is too old (>= 7.19.4)");
449 #endif
450
451 if (getenv("GIT_CURL_VERBOSE"))
452 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
453
454 curl_easy_setopt(result, CURLOPT_USERAGENT,
455 user_agent ? user_agent : git_user_agent());
456
457 if (curl_ftp_no_epsv)
458 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
459
460 #ifdef CURLOPT_USE_SSL
461 if (curl_ssl_try)
462 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
463 #endif
464
465 if (curl_http_proxy) {
466 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
467 #if LIBCURL_VERSION_NUM >= 0x071800
468 if (starts_with(curl_http_proxy, "socks5"))
469 curl_easy_setopt(result,
470 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
471 else if (starts_with(curl_http_proxy, "socks4a"))
472 curl_easy_setopt(result,
473 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
474 else if (starts_with(curl_http_proxy, "socks"))
475 curl_easy_setopt(result,
476 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
477 #endif
478 }
479 #if LIBCURL_VERSION_NUM >= 0x070a07
480 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
481 #endif
482
483 set_curl_keepalive(result);
484
485 return result;
486 }
487
488 static void set_from_env(const char **var, const char *envname)
489 {
490 const char *val = getenv(envname);
491 if (val)
492 *var = val;
493 }
494
495 void http_init(struct remote *remote, const char *url, int proactive_auth)
496 {
497 char *low_speed_limit;
498 char *low_speed_time;
499 char *normalized_url;
500 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
501
502 config.section = "http";
503 config.key = NULL;
504 config.collect_fn = http_options;
505 config.cascade_fn = git_default_config;
506 config.cb = NULL;
507
508 http_is_verbose = 0;
509 normalized_url = url_normalize(url, &config.url);
510
511 git_config(urlmatch_config_entry, &config);
512 free(normalized_url);
513
514 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
515 die("curl_global_init failed");
516
517 http_proactive_auth = proactive_auth;
518
519 if (remote && remote->http_proxy)
520 curl_http_proxy = xstrdup(remote->http_proxy);
521
522 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
523 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
524
525 #ifdef USE_CURL_MULTI
526 {
527 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
528 if (http_max_requests != NULL)
529 max_requests = atoi(http_max_requests);
530 }
531
532 curlm = curl_multi_init();
533 if (!curlm)
534 die("curl_multi_init failed");
535 #endif
536
537 if (getenv("GIT_SSL_NO_VERIFY"))
538 curl_ssl_verify = 0;
539
540 set_from_env(&ssl_cert, "GIT_SSL_CERT");
541 #if LIBCURL_VERSION_NUM >= 0x070903
542 set_from_env(&ssl_key, "GIT_SSL_KEY");
543 #endif
544 #if LIBCURL_VERSION_NUM >= 0x070908
545 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
546 #endif
547 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
548
549 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
550
551 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
552 if (low_speed_limit != NULL)
553 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
554 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
555 if (low_speed_time != NULL)
556 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
557
558 if (curl_ssl_verify == -1)
559 curl_ssl_verify = 1;
560
561 curl_session_count = 0;
562 #ifdef USE_CURL_MULTI
563 if (max_requests < 1)
564 max_requests = DEFAULT_MAX_REQUESTS;
565 #endif
566
567 if (getenv("GIT_CURL_FTP_NO_EPSV"))
568 curl_ftp_no_epsv = 1;
569
570 if (url) {
571 credential_from_url(&http_auth, url);
572 if (!ssl_cert_password_required &&
573 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
574 starts_with(url, "https://"))
575 ssl_cert_password_required = 1;
576 }
577
578 #ifndef NO_CURL_EASY_DUPHANDLE
579 curl_default = get_curl_handle();
580 #endif
581 }
582
583 void http_cleanup(void)
584 {
585 struct active_request_slot *slot = active_queue_head;
586
587 while (slot != NULL) {
588 struct active_request_slot *next = slot->next;
589 if (slot->curl != NULL) {
590 #ifdef USE_CURL_MULTI
591 curl_multi_remove_handle(curlm, slot->curl);
592 #endif
593 curl_easy_cleanup(slot->curl);
594 }
595 free(slot);
596 slot = next;
597 }
598 active_queue_head = NULL;
599
600 #ifndef NO_CURL_EASY_DUPHANDLE
601 curl_easy_cleanup(curl_default);
602 #endif
603
604 #ifdef USE_CURL_MULTI
605 curl_multi_cleanup(curlm);
606 #endif
607 curl_global_cleanup();
608
609 curl_slist_free_all(pragma_header);
610 pragma_header = NULL;
611
612 curl_slist_free_all(no_pragma_header);
613 no_pragma_header = NULL;
614
615 if (curl_http_proxy) {
616 free((void *)curl_http_proxy);
617 curl_http_proxy = NULL;
618 }
619
620 if (cert_auth.password != NULL) {
621 memset(cert_auth.password, 0, strlen(cert_auth.password));
622 free(cert_auth.password);
623 cert_auth.password = NULL;
624 }
625 ssl_cert_password_required = 0;
626
627 free(cached_accept_language);
628 cached_accept_language = NULL;
629 }
630
631 struct active_request_slot *get_active_slot(void)
632 {
633 struct active_request_slot *slot = active_queue_head;
634 struct active_request_slot *newslot;
635
636 #ifdef USE_CURL_MULTI
637 int num_transfers;
638
639 /* Wait for a slot to open up if the queue is full */
640 while (active_requests >= max_requests) {
641 curl_multi_perform(curlm, &num_transfers);
642 if (num_transfers < active_requests)
643 process_curl_messages();
644 }
645 #endif
646
647 while (slot != NULL && slot->in_use)
648 slot = slot->next;
649
650 if (slot == NULL) {
651 newslot = xmalloc(sizeof(*newslot));
652 newslot->curl = NULL;
653 newslot->in_use = 0;
654 newslot->next = NULL;
655
656 slot = active_queue_head;
657 if (slot == NULL) {
658 active_queue_head = newslot;
659 } else {
660 while (slot->next != NULL)
661 slot = slot->next;
662 slot->next = newslot;
663 }
664 slot = newslot;
665 }
666
667 if (slot->curl == NULL) {
668 #ifdef NO_CURL_EASY_DUPHANDLE
669 slot->curl = get_curl_handle();
670 #else
671 slot->curl = curl_easy_duphandle(curl_default);
672 #endif
673 curl_session_count++;
674 }
675
676 active_requests++;
677 slot->in_use = 1;
678 slot->results = NULL;
679 slot->finished = NULL;
680 slot->callback_data = NULL;
681 slot->callback_func = NULL;
682 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
683 if (curl_save_cookies)
684 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
685 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
686 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
687 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
688 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
689 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
690 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
691 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
692 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
693 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
694 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
695 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
696 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
697 #endif
698 if (http_auth.password)
699 init_curl_http_auth(slot->curl);
700
701 return slot;
702 }
703
704 int start_active_slot(struct active_request_slot *slot)
705 {
706 #ifdef USE_CURL_MULTI
707 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
708 int num_transfers;
709
710 if (curlm_result != CURLM_OK &&
711 curlm_result != CURLM_CALL_MULTI_PERFORM) {
712 active_requests--;
713 slot->in_use = 0;
714 return 0;
715 }
716
717 /*
718 * We know there must be something to do, since we just added
719 * something.
720 */
721 curl_multi_perform(curlm, &num_transfers);
722 #endif
723 return 1;
724 }
725
726 #ifdef USE_CURL_MULTI
727 struct fill_chain {
728 void *data;
729 int (*fill)(void *);
730 struct fill_chain *next;
731 };
732
733 static struct fill_chain *fill_cfg;
734
735 void add_fill_function(void *data, int (*fill)(void *))
736 {
737 struct fill_chain *new = xmalloc(sizeof(*new));
738 struct fill_chain **linkp = &fill_cfg;
739 new->data = data;
740 new->fill = fill;
741 new->next = NULL;
742 while (*linkp)
743 linkp = &(*linkp)->next;
744 *linkp = new;
745 }
746
747 void fill_active_slots(void)
748 {
749 struct active_request_slot *slot = active_queue_head;
750
751 while (active_requests < max_requests) {
752 struct fill_chain *fill;
753 for (fill = fill_cfg; fill; fill = fill->next)
754 if (fill->fill(fill->data))
755 break;
756
757 if (!fill)
758 break;
759 }
760
761 while (slot != NULL) {
762 if (!slot->in_use && slot->curl != NULL
763 && curl_session_count > min_curl_sessions) {
764 curl_easy_cleanup(slot->curl);
765 slot->curl = NULL;
766 curl_session_count--;
767 }
768 slot = slot->next;
769 }
770 }
771
772 void step_active_slots(void)
773 {
774 int num_transfers;
775 CURLMcode curlm_result;
776
777 do {
778 curlm_result = curl_multi_perform(curlm, &num_transfers);
779 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
780 if (num_transfers < active_requests) {
781 process_curl_messages();
782 fill_active_slots();
783 }
784 }
785 #endif
786
787 void run_active_slot(struct active_request_slot *slot)
788 {
789 #ifdef USE_CURL_MULTI
790 fd_set readfds;
791 fd_set writefds;
792 fd_set excfds;
793 int max_fd;
794 struct timeval select_timeout;
795 int finished = 0;
796
797 slot->finished = &finished;
798 while (!finished) {
799 step_active_slots();
800
801 if (slot->in_use) {
802 #if LIBCURL_VERSION_NUM >= 0x070f04
803 long curl_timeout;
804 curl_multi_timeout(curlm, &curl_timeout);
805 if (curl_timeout == 0) {
806 continue;
807 } else if (curl_timeout == -1) {
808 select_timeout.tv_sec = 0;
809 select_timeout.tv_usec = 50000;
810 } else {
811 select_timeout.tv_sec = curl_timeout / 1000;
812 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
813 }
814 #else
815 select_timeout.tv_sec = 0;
816 select_timeout.tv_usec = 50000;
817 #endif
818
819 max_fd = -1;
820 FD_ZERO(&readfds);
821 FD_ZERO(&writefds);
822 FD_ZERO(&excfds);
823 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
824
825 /*
826 * It can happen that curl_multi_timeout returns a pathologically
827 * long timeout when curl_multi_fdset returns no file descriptors
828 * to read. See commit message for more details.
829 */
830 if (max_fd < 0 &&
831 (select_timeout.tv_sec > 0 ||
832 select_timeout.tv_usec > 50000)) {
833 select_timeout.tv_sec = 0;
834 select_timeout.tv_usec = 50000;
835 }
836
837 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
838 }
839 }
840 #else
841 while (slot->in_use) {
842 slot->curl_result = curl_easy_perform(slot->curl);
843 finish_active_slot(slot);
844 }
845 #endif
846 }
847
848 static void release_active_slot(struct active_request_slot *slot)
849 {
850 closedown_active_slot(slot);
851 if (slot->curl && curl_session_count > min_curl_sessions) {
852 #ifdef USE_CURL_MULTI
853 curl_multi_remove_handle(curlm, slot->curl);
854 #endif
855 curl_easy_cleanup(slot->curl);
856 slot->curl = NULL;
857 curl_session_count--;
858 }
859 #ifdef USE_CURL_MULTI
860 fill_active_slots();
861 #endif
862 }
863
864 void finish_all_active_slots(void)
865 {
866 struct active_request_slot *slot = active_queue_head;
867
868 while (slot != NULL)
869 if (slot->in_use) {
870 run_active_slot(slot);
871 slot = active_queue_head;
872 } else {
873 slot = slot->next;
874 }
875 }
876
877 /* Helpers for modifying and creating URLs */
878 static inline int needs_quote(int ch)
879 {
880 if (((ch >= 'A') && (ch <= 'Z'))
881 || ((ch >= 'a') && (ch <= 'z'))
882 || ((ch >= '0') && (ch <= '9'))
883 || (ch == '/')
884 || (ch == '-')
885 || (ch == '.'))
886 return 0;
887 return 1;
888 }
889
890 static char *quote_ref_url(const char *base, const char *ref)
891 {
892 struct strbuf buf = STRBUF_INIT;
893 const char *cp;
894 int ch;
895
896 end_url_with_slash(&buf, base);
897
898 for (cp = ref; (ch = *cp) != 0; cp++)
899 if (needs_quote(ch))
900 strbuf_addf(&buf, "%%%02x", ch);
901 else
902 strbuf_addch(&buf, *cp);
903
904 return strbuf_detach(&buf, NULL);
905 }
906
907 void append_remote_object_url(struct strbuf *buf, const char *url,
908 const char *hex,
909 int only_two_digit_prefix)
910 {
911 end_url_with_slash(buf, url);
912
913 strbuf_addf(buf, "objects/%.*s/", 2, hex);
914 if (!only_two_digit_prefix)
915 strbuf_addf(buf, "%s", hex+2);
916 }
917
918 char *get_remote_object_url(const char *url, const char *hex,
919 int only_two_digit_prefix)
920 {
921 struct strbuf buf = STRBUF_INIT;
922 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
923 return strbuf_detach(&buf, NULL);
924 }
925
926 static int handle_curl_result(struct slot_results *results)
927 {
928 /*
929 * If we see a failing http code with CURLE_OK, we have turned off
930 * FAILONERROR (to keep the server's custom error response), and should
931 * translate the code into failure here.
932 */
933 if (results->curl_result == CURLE_OK &&
934 results->http_code >= 400) {
935 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
936 /*
937 * Normally curl will already have put the "reason phrase"
938 * from the server into curl_errorstr; unfortunately without
939 * FAILONERROR it is lost, so we can give only the numeric
940 * status code.
941 */
942 snprintf(curl_errorstr, sizeof(curl_errorstr),
943 "The requested URL returned error: %ld",
944 results->http_code);
945 }
946
947 if (results->curl_result == CURLE_OK) {
948 credential_approve(&http_auth);
949 return HTTP_OK;
950 } else if (missing_target(results))
951 return HTTP_MISSING_TARGET;
952 else if (results->http_code == 401) {
953 if (http_auth.username && http_auth.password) {
954 credential_reject(&http_auth);
955 return HTTP_NOAUTH;
956 } else {
957 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
958 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
959 #endif
960 return HTTP_REAUTH;
961 }
962 } else {
963 #if LIBCURL_VERSION_NUM >= 0x070c00
964 if (!curl_errorstr[0])
965 strlcpy(curl_errorstr,
966 curl_easy_strerror(results->curl_result),
967 sizeof(curl_errorstr));
968 #endif
969 return HTTP_ERROR;
970 }
971 }
972
973 int run_one_slot(struct active_request_slot *slot,
974 struct slot_results *results)
975 {
976 slot->results = results;
977 if (!start_active_slot(slot)) {
978 snprintf(curl_errorstr, sizeof(curl_errorstr),
979 "failed to start HTTP request");
980 return HTTP_START_FAILED;
981 }
982
983 run_active_slot(slot);
984 return handle_curl_result(results);
985 }
986
987 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
988 {
989 char *ptr;
990 CURLcode ret;
991
992 strbuf_reset(buf);
993 ret = curl_easy_getinfo(curl, info, &ptr);
994 if (!ret && ptr)
995 strbuf_addstr(buf, ptr);
996 return ret;
997 }
998
999 /*
1000 * Check for and extract a content-type parameter. "raw"
1001 * should be positioned at the start of the potential
1002 * parameter, with any whitespace already removed.
1003 *
1004 * "name" is the name of the parameter. The value is appended
1005 * to "out".
1006 */
1007 static int extract_param(const char *raw, const char *name,
1008 struct strbuf *out)
1009 {
1010 size_t len = strlen(name);
1011
1012 if (strncasecmp(raw, name, len))
1013 return -1;
1014 raw += len;
1015
1016 if (*raw != '=')
1017 return -1;
1018 raw++;
1019
1020 while (*raw && !isspace(*raw) && *raw != ';')
1021 strbuf_addch(out, *raw++);
1022 return 0;
1023 }
1024
1025 /*
1026 * Extract a normalized version of the content type, with any
1027 * spaces suppressed, all letters lowercased, and no trailing ";"
1028 * or parameters.
1029 *
1030 * Note that we will silently remove even invalid whitespace. For
1031 * example, "text / plain" is specifically forbidden by RFC 2616,
1032 * but "text/plain" is the only reasonable output, and this keeps
1033 * our code simple.
1034 *
1035 * If the "charset" argument is not NULL, store the value of any
1036 * charset parameter there.
1037 *
1038 * Example:
1039 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1040 * "text / plain" -> "text/plain"
1041 */
1042 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1043 struct strbuf *charset)
1044 {
1045 const char *p;
1046
1047 strbuf_reset(type);
1048 strbuf_grow(type, raw->len);
1049 for (p = raw->buf; *p; p++) {
1050 if (isspace(*p))
1051 continue;
1052 if (*p == ';') {
1053 p++;
1054 break;
1055 }
1056 strbuf_addch(type, tolower(*p));
1057 }
1058
1059 if (!charset)
1060 return;
1061
1062 strbuf_reset(charset);
1063 while (*p) {
1064 while (isspace(*p) || *p == ';')
1065 p++;
1066 if (!extract_param(p, "charset", charset))
1067 return;
1068 while (*p && !isspace(*p))
1069 p++;
1070 }
1071
1072 if (!charset->len && starts_with(type->buf, "text/"))
1073 strbuf_addstr(charset, "ISO-8859-1");
1074 }
1075
1076 static void write_accept_language(struct strbuf *buf)
1077 {
1078 /*
1079 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1080 * that, q-value will be smaller than 0.001, the minimum q-value the
1081 * HTTP specification allows. See
1082 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1083 */
1084 const int MAX_DECIMAL_PLACES = 3;
1085 const int MAX_LANGUAGE_TAGS = 1000;
1086 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1087 char **language_tags = NULL;
1088 int num_langs = 0;
1089 const char *s = get_preferred_languages();
1090 int i;
1091 struct strbuf tag = STRBUF_INIT;
1092
1093 /* Don't add Accept-Language header if no language is preferred. */
1094 if (!s)
1095 return;
1096
1097 /*
1098 * Split the colon-separated string of preferred languages into
1099 * language_tags array.
1100 */
1101 do {
1102 /* collect language tag */
1103 for (; *s && (isalnum(*s) || *s == '_'); s++)
1104 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1105
1106 /* skip .codeset, @modifier and any other unnecessary parts */
1107 while (*s && *s != ':')
1108 s++;
1109
1110 if (tag.len) {
1111 num_langs++;
1112 REALLOC_ARRAY(language_tags, num_langs);
1113 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1114 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1115 break;
1116 }
1117 } while (*s++);
1118
1119 /* write Accept-Language header into buf */
1120 if (num_langs) {
1121 int last_buf_len = 0;
1122 int max_q;
1123 int decimal_places;
1124 char q_format[32];
1125
1126 /* add '*' */
1127 REALLOC_ARRAY(language_tags, num_langs + 1);
1128 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1129
1130 /* compute decimal_places */
1131 for (max_q = 1, decimal_places = 0;
1132 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1133 decimal_places++, max_q *= 10)
1134 ;
1135
1136 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1137
1138 strbuf_addstr(buf, "Accept-Language: ");
1139
1140 for (i = 0; i < num_langs; i++) {
1141 if (i > 0)
1142 strbuf_addstr(buf, ", ");
1143
1144 strbuf_addstr(buf, language_tags[i]);
1145
1146 if (i > 0)
1147 strbuf_addf(buf, q_format, max_q - i);
1148
1149 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1150 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1151 break;
1152 }
1153
1154 last_buf_len = buf->len;
1155 }
1156 }
1157
1158 /* free language tags -- last one is a static '*' */
1159 for (i = 0; i < num_langs - 1; i++)
1160 free(language_tags[i]);
1161 free(language_tags);
1162 }
1163
1164 /*
1165 * Get an Accept-Language header which indicates user's preferred languages.
1166 *
1167 * Examples:
1168 * LANGUAGE= -> ""
1169 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1170 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1171 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1172 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1173 * LANGUAGE= LANG=C -> ""
1174 */
1175 static const char *get_accept_language(void)
1176 {
1177 if (!cached_accept_language) {
1178 struct strbuf buf = STRBUF_INIT;
1179 write_accept_language(&buf);
1180 if (buf.len > 0)
1181 cached_accept_language = strbuf_detach(&buf, NULL);
1182 }
1183
1184 return cached_accept_language;
1185 }
1186
1187 static void http_opt_request_remainder(CURL *curl, off_t pos)
1188 {
1189 char buf[128];
1190 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1191 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1192 }
1193
1194 /* http_request() targets */
1195 #define HTTP_REQUEST_STRBUF 0
1196 #define HTTP_REQUEST_FILE 1
1197
1198 static int http_request(const char *url,
1199 void *result, int target,
1200 const struct http_get_options *options)
1201 {
1202 struct active_request_slot *slot;
1203 struct slot_results results;
1204 struct curl_slist *headers = NULL;
1205 struct strbuf buf = STRBUF_INIT;
1206 const char *accept_language;
1207 int ret;
1208
1209 slot = get_active_slot();
1210 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1211
1212 if (result == NULL) {
1213 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1214 } else {
1215 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1216 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1217
1218 if (target == HTTP_REQUEST_FILE) {
1219 off_t posn = ftello(result);
1220 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1221 fwrite);
1222 if (posn > 0)
1223 http_opt_request_remainder(slot->curl, posn);
1224 } else
1225 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1226 fwrite_buffer);
1227 }
1228
1229 accept_language = get_accept_language();
1230
1231 if (accept_language)
1232 headers = curl_slist_append(headers, accept_language);
1233
1234 strbuf_addstr(&buf, "Pragma:");
1235 if (options && options->no_cache)
1236 strbuf_addstr(&buf, " no-cache");
1237 if (options && options->keep_error)
1238 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1239
1240 headers = curl_slist_append(headers, buf.buf);
1241
1242 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1243 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1244 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1245
1246 ret = run_one_slot(slot, &results);
1247
1248 if (options && options->content_type) {
1249 struct strbuf raw = STRBUF_INIT;
1250 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1251 extract_content_type(&raw, options->content_type,
1252 options->charset);
1253 strbuf_release(&raw);
1254 }
1255
1256 if (options && options->effective_url)
1257 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1258 options->effective_url);
1259
1260 curl_slist_free_all(headers);
1261 strbuf_release(&buf);
1262
1263 return ret;
1264 }
1265
1266 /*
1267 * Update the "base" url to a more appropriate value, as deduced by
1268 * redirects seen when requesting a URL starting with "url".
1269 *
1270 * The "asked" parameter is a URL that we asked curl to access, and must begin
1271 * with "base".
1272 *
1273 * The "got" parameter is the URL that curl reported to us as where we ended
1274 * up.
1275 *
1276 * Returns 1 if we updated the base url, 0 otherwise.
1277 *
1278 * Our basic strategy is to compare "base" and "asked" to find the bits
1279 * specific to our request. We then strip those bits off of "got" to yield the
1280 * new base. So for example, if our base is "http://example.com/foo.git",
1281 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1282 * with "https://other.example.com/foo.git/info/refs". We would want the
1283 * new URL to become "https://other.example.com/foo.git".
1284 *
1285 * Note that this assumes a sane redirect scheme. It's entirely possible
1286 * in the example above to end up at a URL that does not even end in
1287 * "info/refs". In such a case we simply punt, as there is not much we can
1288 * do (and such a scheme is unlikely to represent a real git repository,
1289 * which means we are likely about to abort anyway).
1290 */
1291 static int update_url_from_redirect(struct strbuf *base,
1292 const char *asked,
1293 const struct strbuf *got)
1294 {
1295 const char *tail;
1296 size_t tail_len;
1297
1298 if (!strcmp(asked, got->buf))
1299 return 0;
1300
1301 if (!skip_prefix(asked, base->buf, &tail))
1302 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1303 asked, base->buf);
1304
1305 tail_len = strlen(tail);
1306
1307 if (got->len < tail_len ||
1308 strcmp(tail, got->buf + got->len - tail_len))
1309 return 0; /* insane redirect scheme */
1310
1311 strbuf_reset(base);
1312 strbuf_add(base, got->buf, got->len - tail_len);
1313 return 1;
1314 }
1315
1316 static int http_request_reauth(const char *url,
1317 void *result, int target,
1318 struct http_get_options *options)
1319 {
1320 int ret = http_request(url, result, target, options);
1321
1322 if (options && options->effective_url && options->base_url) {
1323 if (update_url_from_redirect(options->base_url,
1324 url, options->effective_url)) {
1325 credential_from_url(&http_auth, options->base_url->buf);
1326 url = options->effective_url->buf;
1327 }
1328 }
1329
1330 if (ret != HTTP_REAUTH)
1331 return ret;
1332
1333 /*
1334 * If we are using KEEP_ERROR, the previous request may have
1335 * put cruft into our output stream; we should clear it out before
1336 * making our next request. We only know how to do this for
1337 * the strbuf case, but that is enough to satisfy current callers.
1338 */
1339 if (options && options->keep_error) {
1340 switch (target) {
1341 case HTTP_REQUEST_STRBUF:
1342 strbuf_reset(result);
1343 break;
1344 default:
1345 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1346 }
1347 }
1348
1349 credential_fill(&http_auth);
1350
1351 return http_request(url, result, target, options);
1352 }
1353
1354 int http_get_strbuf(const char *url,
1355 struct strbuf *result,
1356 struct http_get_options *options)
1357 {
1358 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1359 }
1360
1361 /*
1362 * Downloads a URL and stores the result in the given file.
1363 *
1364 * If a previous interrupted download is detected (i.e. a previous temporary
1365 * file is still around) the download is resumed.
1366 */
1367 static int http_get_file(const char *url, const char *filename,
1368 struct http_get_options *options)
1369 {
1370 int ret;
1371 struct strbuf tmpfile = STRBUF_INIT;
1372 FILE *result;
1373
1374 strbuf_addf(&tmpfile, "%s.temp", filename);
1375 result = fopen(tmpfile.buf, "a");
1376 if (!result) {
1377 error("Unable to open local file %s", tmpfile.buf);
1378 ret = HTTP_ERROR;
1379 goto cleanup;
1380 }
1381
1382 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1383 fclose(result);
1384
1385 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1386 ret = HTTP_ERROR;
1387 cleanup:
1388 strbuf_release(&tmpfile);
1389 return ret;
1390 }
1391
1392 int http_fetch_ref(const char *base, struct ref *ref)
1393 {
1394 struct http_get_options options = {0};
1395 char *url;
1396 struct strbuf buffer = STRBUF_INIT;
1397 int ret = -1;
1398
1399 options.no_cache = 1;
1400
1401 url = quote_ref_url(base, ref->name);
1402 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1403 strbuf_rtrim(&buffer);
1404 if (buffer.len == 40)
1405 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1406 else if (starts_with(buffer.buf, "ref: ")) {
1407 ref->symref = xstrdup(buffer.buf + 5);
1408 ret = 0;
1409 }
1410 }
1411
1412 strbuf_release(&buffer);
1413 free(url);
1414 return ret;
1415 }
1416
1417 /* Helpers for fetching packs */
1418 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1419 {
1420 char *url, *tmp;
1421 struct strbuf buf = STRBUF_INIT;
1422
1423 if (http_is_verbose)
1424 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1425
1426 end_url_with_slash(&buf, base_url);
1427 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1428 url = strbuf_detach(&buf, NULL);
1429
1430 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1431 tmp = strbuf_detach(&buf, NULL);
1432
1433 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1434 error("Unable to get pack index %s", url);
1435 free(tmp);
1436 tmp = NULL;
1437 }
1438
1439 free(url);
1440 return tmp;
1441 }
1442
1443 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1444 unsigned char *sha1, const char *base_url)
1445 {
1446 struct packed_git *new_pack;
1447 char *tmp_idx = NULL;
1448 int ret;
1449
1450 if (has_pack_index(sha1)) {
1451 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1452 if (!new_pack)
1453 return -1; /* parse_pack_index() already issued error message */
1454 goto add_pack;
1455 }
1456
1457 tmp_idx = fetch_pack_index(sha1, base_url);
1458 if (!tmp_idx)
1459 return -1;
1460
1461 new_pack = parse_pack_index(sha1, tmp_idx);
1462 if (!new_pack) {
1463 unlink(tmp_idx);
1464 free(tmp_idx);
1465
1466 return -1; /* parse_pack_index() already issued error message */
1467 }
1468
1469 ret = verify_pack_index(new_pack);
1470 if (!ret) {
1471 close_pack_index(new_pack);
1472 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1473 }
1474 free(tmp_idx);
1475 if (ret)
1476 return -1;
1477
1478 add_pack:
1479 new_pack->next = *packs_head;
1480 *packs_head = new_pack;
1481 return 0;
1482 }
1483
1484 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1485 {
1486 struct http_get_options options = {0};
1487 int ret = 0, i = 0;
1488 char *url, *data;
1489 struct strbuf buf = STRBUF_INIT;
1490 unsigned char sha1[20];
1491
1492 end_url_with_slash(&buf, base_url);
1493 strbuf_addstr(&buf, "objects/info/packs");
1494 url = strbuf_detach(&buf, NULL);
1495
1496 options.no_cache = 1;
1497 ret = http_get_strbuf(url, &buf, &options);
1498 if (ret != HTTP_OK)
1499 goto cleanup;
1500
1501 data = buf.buf;
1502 while (i < buf.len) {
1503 switch (data[i]) {
1504 case 'P':
1505 i++;
1506 if (i + 52 <= buf.len &&
1507 starts_with(data + i, " pack-") &&
1508 starts_with(data + i + 46, ".pack\n")) {
1509 get_sha1_hex(data + i + 6, sha1);
1510 fetch_and_setup_pack_index(packs_head, sha1,
1511 base_url);
1512 i += 51;
1513 break;
1514 }
1515 default:
1516 while (i < buf.len && data[i] != '\n')
1517 i++;
1518 }
1519 i++;
1520 }
1521
1522 cleanup:
1523 free(url);
1524 return ret;
1525 }
1526
1527 void release_http_pack_request(struct http_pack_request *preq)
1528 {
1529 if (preq->packfile != NULL) {
1530 fclose(preq->packfile);
1531 preq->packfile = NULL;
1532 }
1533 preq->slot = NULL;
1534 free(preq->url);
1535 free(preq);
1536 }
1537
1538 int finish_http_pack_request(struct http_pack_request *preq)
1539 {
1540 struct packed_git **lst;
1541 struct packed_git *p = preq->target;
1542 char *tmp_idx;
1543 size_t len;
1544 struct child_process ip = CHILD_PROCESS_INIT;
1545 const char *ip_argv[8];
1546
1547 close_pack_index(p);
1548
1549 fclose(preq->packfile);
1550 preq->packfile = NULL;
1551
1552 lst = preq->lst;
1553 while (*lst != p)
1554 lst = &((*lst)->next);
1555 *lst = (*lst)->next;
1556
1557 if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1558 die("BUG: pack tmpfile does not end in .pack.temp?");
1559 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1560
1561 ip_argv[0] = "index-pack";
1562 ip_argv[1] = "-o";
1563 ip_argv[2] = tmp_idx;
1564 ip_argv[3] = preq->tmpfile;
1565 ip_argv[4] = NULL;
1566
1567 ip.argv = ip_argv;
1568 ip.git_cmd = 1;
1569 ip.no_stdin = 1;
1570 ip.no_stdout = 1;
1571
1572 if (run_command(&ip)) {
1573 unlink(preq->tmpfile);
1574 unlink(tmp_idx);
1575 free(tmp_idx);
1576 return -1;
1577 }
1578
1579 unlink(sha1_pack_index_name(p->sha1));
1580
1581 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1582 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1583 free(tmp_idx);
1584 return -1;
1585 }
1586
1587 install_packed_git(p);
1588 free(tmp_idx);
1589 return 0;
1590 }
1591
1592 struct http_pack_request *new_http_pack_request(
1593 struct packed_git *target, const char *base_url)
1594 {
1595 off_t prev_posn = 0;
1596 struct strbuf buf = STRBUF_INIT;
1597 struct http_pack_request *preq;
1598
1599 preq = xcalloc(1, sizeof(*preq));
1600 preq->target = target;
1601
1602 end_url_with_slash(&buf, base_url);
1603 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1604 sha1_to_hex(target->sha1));
1605 preq->url = strbuf_detach(&buf, NULL);
1606
1607 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1608 sha1_pack_name(target->sha1));
1609 preq->packfile = fopen(preq->tmpfile, "a");
1610 if (!preq->packfile) {
1611 error("Unable to open local file %s for pack",
1612 preq->tmpfile);
1613 goto abort;
1614 }
1615
1616 preq->slot = get_active_slot();
1617 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1618 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1619 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1620 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1621 no_pragma_header);
1622
1623 /*
1624 * If there is data present from a previous transfer attempt,
1625 * resume where it left off
1626 */
1627 prev_posn = ftello(preq->packfile);
1628 if (prev_posn>0) {
1629 if (http_is_verbose)
1630 fprintf(stderr,
1631 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
1632 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
1633 http_opt_request_remainder(preq->slot->curl, prev_posn);
1634 }
1635
1636 return preq;
1637
1638 abort:
1639 free(preq->url);
1640 free(preq);
1641 return NULL;
1642 }
1643
1644 /* Helpers for fetching objects (loose) */
1645 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1646 void *data)
1647 {
1648 unsigned char expn[4096];
1649 size_t size = eltsize * nmemb;
1650 int posn = 0;
1651 struct http_object_request *freq =
1652 (struct http_object_request *)data;
1653 do {
1654 ssize_t retval = xwrite(freq->localfile,
1655 (char *) ptr + posn, size - posn);
1656 if (retval < 0)
1657 return posn;
1658 posn += retval;
1659 } while (posn < size);
1660
1661 freq->stream.avail_in = size;
1662 freq->stream.next_in = (void *)ptr;
1663 do {
1664 freq->stream.next_out = expn;
1665 freq->stream.avail_out = sizeof(expn);
1666 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1667 git_SHA1_Update(&freq->c, expn,
1668 sizeof(expn) - freq->stream.avail_out);
1669 } while (freq->stream.avail_in && freq->zret == Z_OK);
1670 return size;
1671 }
1672
1673 struct http_object_request *new_http_object_request(const char *base_url,
1674 unsigned char *sha1)
1675 {
1676 char *hex = sha1_to_hex(sha1);
1677 const char *filename;
1678 char prevfile[PATH_MAX];
1679 int prevlocal;
1680 char prev_buf[PREV_BUF_SIZE];
1681 ssize_t prev_read = 0;
1682 off_t prev_posn = 0;
1683 struct http_object_request *freq;
1684
1685 freq = xcalloc(1, sizeof(*freq));
1686 hashcpy(freq->sha1, sha1);
1687 freq->localfile = -1;
1688
1689 filename = sha1_file_name(sha1);
1690 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1691 "%s.temp", filename);
1692
1693 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1694 unlink_or_warn(prevfile);
1695 rename(freq->tmpfile, prevfile);
1696 unlink_or_warn(freq->tmpfile);
1697
1698 if (freq->localfile != -1)
1699 error("fd leakage in start: %d", freq->localfile);
1700 freq->localfile = open(freq->tmpfile,
1701 O_WRONLY | O_CREAT | O_EXCL, 0666);
1702 /*
1703 * This could have failed due to the "lazy directory creation";
1704 * try to mkdir the last path component.
1705 */
1706 if (freq->localfile < 0 && errno == ENOENT) {
1707 char *dir = strrchr(freq->tmpfile, '/');
1708 if (dir) {
1709 *dir = 0;
1710 mkdir(freq->tmpfile, 0777);
1711 *dir = '/';
1712 }
1713 freq->localfile = open(freq->tmpfile,
1714 O_WRONLY | O_CREAT | O_EXCL, 0666);
1715 }
1716
1717 if (freq->localfile < 0) {
1718 error("Couldn't create temporary file %s: %s",
1719 freq->tmpfile, strerror(errno));
1720 goto abort;
1721 }
1722
1723 git_inflate_init(&freq->stream);
1724
1725 git_SHA1_Init(&freq->c);
1726
1727 freq->url = get_remote_object_url(base_url, hex, 0);
1728
1729 /*
1730 * If a previous temp file is present, process what was already
1731 * fetched.
1732 */
1733 prevlocal = open(prevfile, O_RDONLY);
1734 if (prevlocal != -1) {
1735 do {
1736 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1737 if (prev_read>0) {
1738 if (fwrite_sha1_file(prev_buf,
1739 1,
1740 prev_read,
1741 freq) == prev_read) {
1742 prev_posn += prev_read;
1743 } else {
1744 prev_read = -1;
1745 }
1746 }
1747 } while (prev_read > 0);
1748 close(prevlocal);
1749 }
1750 unlink_or_warn(prevfile);
1751
1752 /*
1753 * Reset inflate/SHA1 if there was an error reading the previous temp
1754 * file; also rewind to the beginning of the local file.
1755 */
1756 if (prev_read == -1) {
1757 memset(&freq->stream, 0, sizeof(freq->stream));
1758 git_inflate_init(&freq->stream);
1759 git_SHA1_Init(&freq->c);
1760 if (prev_posn>0) {
1761 prev_posn = 0;
1762 lseek(freq->localfile, 0, SEEK_SET);
1763 if (ftruncate(freq->localfile, 0) < 0) {
1764 error("Couldn't truncate temporary file %s: %s",
1765 freq->tmpfile, strerror(errno));
1766 goto abort;
1767 }
1768 }
1769 }
1770
1771 freq->slot = get_active_slot();
1772
1773 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1774 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1775 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1776 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1777 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1778
1779 /*
1780 * If we have successfully processed data from a previous fetch
1781 * attempt, only fetch the data we don't already have.
1782 */
1783 if (prev_posn>0) {
1784 if (http_is_verbose)
1785 fprintf(stderr,
1786 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
1787 hex, (uintmax_t)prev_posn);
1788 http_opt_request_remainder(freq->slot->curl, prev_posn);
1789 }
1790
1791 return freq;
1792
1793 abort:
1794 free(freq->url);
1795 free(freq);
1796 return NULL;
1797 }
1798
1799 void process_http_object_request(struct http_object_request *freq)
1800 {
1801 if (freq->slot == NULL)
1802 return;
1803 freq->curl_result = freq->slot->curl_result;
1804 freq->http_code = freq->slot->http_code;
1805 freq->slot = NULL;
1806 }
1807
1808 int finish_http_object_request(struct http_object_request *freq)
1809 {
1810 struct stat st;
1811
1812 close(freq->localfile);
1813 freq->localfile = -1;
1814
1815 process_http_object_request(freq);
1816
1817 if (freq->http_code == 416) {
1818 warning("requested range invalid; we may already have all the data.");
1819 } else if (freq->curl_result != CURLE_OK) {
1820 if (stat(freq->tmpfile, &st) == 0)
1821 if (st.st_size == 0)
1822 unlink_or_warn(freq->tmpfile);
1823 return -1;
1824 }
1825
1826 git_inflate_end(&freq->stream);
1827 git_SHA1_Final(freq->real_sha1, &freq->c);
1828 if (freq->zret != Z_STREAM_END) {
1829 unlink_or_warn(freq->tmpfile);
1830 return -1;
1831 }
1832 if (hashcmp(freq->sha1, freq->real_sha1)) {
1833 unlink_or_warn(freq->tmpfile);
1834 return -1;
1835 }
1836 freq->rename =
1837 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
1838
1839 return freq->rename;
1840 }
1841
1842 void abort_http_object_request(struct http_object_request *freq)
1843 {
1844 unlink_or_warn(freq->tmpfile);
1845
1846 release_http_object_request(freq);
1847 }
1848
1849 void release_http_object_request(struct http_object_request *freq)
1850 {
1851 if (freq->localfile != -1) {
1852 close(freq->localfile);
1853 freq->localfile = -1;
1854 }
1855 if (freq->url != NULL) {
1856 free(freq->url);
1857 freq->url = NULL;
1858 }
1859 if (freq->slot != NULL) {
1860 freq->slot->callback_func = NULL;
1861 freq->slot->callback_data = NULL;
1862 release_active_slot(freq->slot);
1863 freq->slot = NULL;
1864 }
1865 }
The Best VCS Around