?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
http: consolidate #ifdefs for curl_multi_remove_handle
[git.git] / http.c
bloba24f0d132d30aadd82eff6a02dc6d86fca48ff63
1 #include "git-compat-util.h"
2 #include "http.h"
3 #include "pack.h"
4 #include "sideband.h"
5 #include "run-command.h"
6 #include "url.h"
7 #include "urlmatch.h"
8 #include "credential.h"
9 #include "version.h"
10 #include "pkt-line.h"
11 #include "gettext.h"
12 #include "transport.h"
13
14 int active_requests;
15 int http_is_verbose;
16 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
17
18 #if LIBCURL_VERSION_NUM >= 0x070a06
19 #define LIBCURL_CAN_HANDLE_AUTH_ANY
20 #endif
21
22 static int min_curl_sessions = 1;
23 static int curl_session_count;
24 #ifdef USE_CURL_MULTI
25 static int max_requests = -1;
26 static CURLM *curlm;
27 #endif
28 #ifndef NO_CURL_EASY_DUPHANDLE
29 static CURL *curl_default;
30 #endif
31
32 #define PREV_BUF_SIZE 4096
33 #define RANGE_HEADER_SIZE 30
34
35 char curl_errorstr[CURL_ERROR_SIZE];
36
37 static int curl_ssl_verify = -1;
38 static int curl_ssl_try;
39 static const char *ssl_cert;
40 static const char *ssl_cipherlist;
41 static const char *ssl_version;
42 static struct {
43 const char *name;
44 long ssl_version;
45 } sslversions[] = {
46 { "sslv2", CURL_SSLVERSION_SSLv2 },
47 { "sslv3", CURL_SSLVERSION_SSLv3 },
48 { "tlsv1", CURL_SSLVERSION_TLSv1 },
49 #if LIBCURL_VERSION_NUM >= 0x072200
50 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
51 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
52 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
53 #endif
54 };
55 #if LIBCURL_VERSION_NUM >= 0x070903
56 static const char *ssl_key;
57 #endif
58 #if LIBCURL_VERSION_NUM >= 0x070908
59 static const char *ssl_capath;
60 #endif
61 static const char *ssl_cainfo;
62 static long curl_low_speed_limit = -1;
63 static long curl_low_speed_time = -1;
64 static int curl_ftp_no_epsv;
65 static const char *curl_http_proxy;
66 static const char *curl_cookie_file;
67 static int curl_save_cookies;
68 struct credential http_auth = CREDENTIAL_INIT;
69 static int http_proactive_auth;
70 static const char *user_agent;
71
72 #if LIBCURL_VERSION_NUM >= 0x071700
73 /* Use CURLOPT_KEYPASSWD as is */
74 #elif LIBCURL_VERSION_NUM >= 0x070903
75 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
76 #else
77 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
78 #endif
79
80 static struct credential cert_auth = CREDENTIAL_INIT;
81 static int ssl_cert_password_required;
82 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
83 static unsigned long http_auth_methods = CURLAUTH_ANY;
84 #endif
85
86 static struct curl_slist *pragma_header;
87 static struct curl_slist *no_pragma_header;
88
89 static struct active_request_slot *active_queue_head;
90
91 static char *cached_accept_language;
92
93 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
94 {
95 size_t size = eltsize * nmemb;
96 struct buffer *buffer = buffer_;
97
98 if (size > buffer->buf.len - buffer->posn)
99 size = buffer->buf.len - buffer->posn;
100 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
101 buffer->posn += size;
102
103 return size;
104 }
105
106 #ifndef NO_CURL_IOCTL
107 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
108 {
109 struct buffer *buffer = clientp;
110
111 switch (cmd) {
112 case CURLIOCMD_NOP:
113 return CURLIOE_OK;
114
115 case CURLIOCMD_RESTARTREAD:
116 buffer->posn = 0;
117 return CURLIOE_OK;
118
119 default:
120 return CURLIOE_UNKNOWNCMD;
121 }
122 }
123 #endif
124
125 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
126 {
127 size_t size = eltsize * nmemb;
128 struct strbuf *buffer = buffer_;
129
130 strbuf_add(buffer, ptr, size);
131 return size;
132 }
133
134 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
135 {
136 return eltsize * nmemb;
137 }
138
139 static void closedown_active_slot(struct active_request_slot *slot)
140 {
141 active_requests--;
142 slot->in_use = 0;
143 }
144
145 static void finish_active_slot(struct active_request_slot *slot)
146 {
147 closedown_active_slot(slot);
148 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
149
150 if (slot->finished != NULL)
151 (*slot->finished) = 1;
152
153 /* Store slot results so they can be read after the slot is reused */
154 if (slot->results != NULL) {
155 slot->results->curl_result = slot->curl_result;
156 slot->results->http_code = slot->http_code;
157 #if LIBCURL_VERSION_NUM >= 0x070a08
158 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
159 &slot->results->auth_avail);
160 #else
161 slot->results->auth_avail = 0;
162 #endif
163 }
164
165 /* Run callback if appropriate */
166 if (slot->callback_func != NULL)
167 slot->callback_func(slot->callback_data);
168 }
169
170 static void xmulti_remove_handle(struct active_request_slot *slot)
171 {
172 #ifdef USE_CURL_MULTI
173 curl_multi_remove_handle(curlm, slot->curl);
174 #endif
175 }
176
177 #ifdef USE_CURL_MULTI
178 static void process_curl_messages(void)
179 {
180 int num_messages;
181 struct active_request_slot *slot;
182 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
183
184 while (curl_message != NULL) {
185 if (curl_message->msg == CURLMSG_DONE) {
186 int curl_result = curl_message->data.result;
187 slot = active_queue_head;
188 while (slot != NULL &&
189 slot->curl != curl_message->easy_handle)
190 slot = slot->next;
191 if (slot != NULL) {
192 xmulti_remove_handle(slot);
193 slot->curl_result = curl_result;
194 finish_active_slot(slot);
195 } else {
196 fprintf(stderr, "Received DONE message for unknown request!\n");
197 }
198 } else {
199 fprintf(stderr, "Unknown CURL message received: %d\n",
200 (int)curl_message->msg);
201 }
202 curl_message = curl_multi_info_read(curlm, &num_messages);
203 }
204 }
205 #endif
206
207 static int http_options(const char *var, const char *value, void *cb)
208 {
209 if (!strcmp("http.sslverify", var)) {
210 curl_ssl_verify = git_config_bool(var, value);
211 return 0;
212 }
213 if (!strcmp("http.sslcipherlist", var))
214 return git_config_string(&ssl_cipherlist, var, value);
215 if (!strcmp("http.sslversion", var))
216 return git_config_string(&ssl_version, var, value);
217 if (!strcmp("http.sslcert", var))
218 return git_config_string(&ssl_cert, var, value);
219 #if LIBCURL_VERSION_NUM >= 0x070903
220 if (!strcmp("http.sslkey", var))
221 return git_config_string(&ssl_key, var, value);
222 #endif
223 #if LIBCURL_VERSION_NUM >= 0x070908
224 if (!strcmp("http.sslcapath", var))
225 return git_config_pathname(&ssl_capath, var, value);
226 #endif
227 if (!strcmp("http.sslcainfo", var))
228 return git_config_pathname(&ssl_cainfo, var, value);
229 if (!strcmp("http.sslcertpasswordprotected", var)) {
230 ssl_cert_password_required = git_config_bool(var, value);
231 return 0;
232 }
233 if (!strcmp("http.ssltry", var)) {
234 curl_ssl_try = git_config_bool(var, value);
235 return 0;
236 }
237 if (!strcmp("http.minsessions", var)) {
238 min_curl_sessions = git_config_int(var, value);
239 #ifndef USE_CURL_MULTI
240 if (min_curl_sessions > 1)
241 min_curl_sessions = 1;
242 #endif
243 return 0;
244 }
245 #ifdef USE_CURL_MULTI
246 if (!strcmp("http.maxrequests", var)) {
247 max_requests = git_config_int(var, value);
248 return 0;
249 }
250 #endif
251 if (!strcmp("http.lowspeedlimit", var)) {
252 curl_low_speed_limit = (long)git_config_int(var, value);
253 return 0;
254 }
255 if (!strcmp("http.lowspeedtime", var)) {
256 curl_low_speed_time = (long)git_config_int(var, value);
257 return 0;
258 }
259
260 if (!strcmp("http.noepsv", var)) {
261 curl_ftp_no_epsv = git_config_bool(var, value);
262 return 0;
263 }
264 if (!strcmp("http.proxy", var))
265 return git_config_string(&curl_http_proxy, var, value);
266
267 if (!strcmp("http.cookiefile", var))
268 return git_config_string(&curl_cookie_file, var, value);
269 if (!strcmp("http.savecookies", var)) {
270 curl_save_cookies = git_config_bool(var, value);
271 return 0;
272 }
273
274 if (!strcmp("http.postbuffer", var)) {
275 http_post_buffer = git_config_int(var, value);
276 if (http_post_buffer < LARGE_PACKET_MAX)
277 http_post_buffer = LARGE_PACKET_MAX;
278 return 0;
279 }
280
281 if (!strcmp("http.useragent", var))
282 return git_config_string(&user_agent, var, value);
283
284 /* Fall back on the default ones */
285 return git_default_config(var, value, cb);
286 }
287
288 static void init_curl_http_auth(CURL *result)
289 {
290 if (!http_auth.username)
291 return;
292
293 credential_fill(&http_auth);
294
295 #if LIBCURL_VERSION_NUM >= 0x071301
296 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
297 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
298 #else
299 {
300 static struct strbuf up = STRBUF_INIT;
301 /*
302 * Note that we assume we only ever have a single set of
303 * credentials in a given program run, so we do not have
304 * to worry about updating this buffer, only setting its
305 * initial value.
306 */
307 if (!up.len)
308 strbuf_addf(&up, "%s:%s",
309 http_auth.username, http_auth.password);
310 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
311 }
312 #endif
313 }
314
315 static int has_cert_password(void)
316 {
317 if (ssl_cert == NULL || ssl_cert_password_required != 1)
318 return 0;
319 if (!cert_auth.password) {
320 cert_auth.protocol = xstrdup("cert");
321 cert_auth.username = xstrdup("");
322 cert_auth.path = xstrdup(ssl_cert);
323 credential_fill(&cert_auth);
324 }
325 return 1;
326 }
327
328 #if LIBCURL_VERSION_NUM >= 0x071900
329 static void set_curl_keepalive(CURL *c)
330 {
331 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
332 }
333
334 #elif LIBCURL_VERSION_NUM >= 0x071000
335 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
336 {
337 int ka = 1;
338 int rc;
339 socklen_t len = (socklen_t)sizeof(ka);
340
341 if (type != CURLSOCKTYPE_IPCXN)
342 return 0;
343
344 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
345 if (rc < 0)
346 warning("unable to set SO_KEEPALIVE on socket %s",
347 strerror(errno));
348
349 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
350 }
351
352 static void set_curl_keepalive(CURL *c)
353 {
354 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
355 }
356
357 #else
358 static void set_curl_keepalive(CURL *c)
359 {
360 /* not supported on older curl versions */
361 }
362 #endif
363
364 static CURL *get_curl_handle(void)
365 {
366 CURL *result = curl_easy_init();
367 long allowed_protocols = 0;
368
369 if (!result)
370 die("curl_easy_init failed");
371
372 if (!curl_ssl_verify) {
373 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
374 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
375 } else {
376 /* Verify authenticity of the peer's certificate */
377 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
378 /* The name in the cert must match whom we tried to connect */
379 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
380 }
381
382 #if LIBCURL_VERSION_NUM >= 0x070907
383 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
384 #endif
385 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
386 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
387 #endif
388
389 if (http_proactive_auth)
390 init_curl_http_auth(result);
391
392 if (getenv("GIT_SSL_VERSION"))
393 ssl_version = getenv("GIT_SSL_VERSION");
394 if (ssl_version && *ssl_version) {
395 int i;
396 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
397 if (!strcmp(ssl_version, sslversions[i].name)) {
398 curl_easy_setopt(result, CURLOPT_SSLVERSION,
399 sslversions[i].ssl_version);
400 break;
401 }
402 }
403 if (i == ARRAY_SIZE(sslversions))
404 warning("unsupported ssl version %s: using default",
405 ssl_version);
406 }
407
408 if (getenv("GIT_SSL_CIPHER_LIST"))
409 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
410 if (ssl_cipherlist != NULL && *ssl_cipherlist)
411 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
412 ssl_cipherlist);
413
414 if (ssl_cert != NULL)
415 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
416 if (has_cert_password())
417 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
418 #if LIBCURL_VERSION_NUM >= 0x070903
419 if (ssl_key != NULL)
420 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
421 #endif
422 #if LIBCURL_VERSION_NUM >= 0x070908
423 if (ssl_capath != NULL)
424 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
425 #endif
426 if (ssl_cainfo != NULL)
427 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
428
429 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
430 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
431 curl_low_speed_limit);
432 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
433 curl_low_speed_time);
434 }
435
436 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
437 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
438 #if LIBCURL_VERSION_NUM >= 0x071301
439 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
440 #elif LIBCURL_VERSION_NUM >= 0x071101
441 curl_easy_setopt(result, CURLOPT_POST301, 1);
442 #endif
443 #if LIBCURL_VERSION_NUM >= 0x071304
444 if (is_transport_allowed("http"))
445 allowed_protocols |= CURLPROTO_HTTP;
446 if (is_transport_allowed("https"))
447 allowed_protocols |= CURLPROTO_HTTPS;
448 if (is_transport_allowed("ftp"))
449 allowed_protocols |= CURLPROTO_FTP;
450 if (is_transport_allowed("ftps"))
451 allowed_protocols |= CURLPROTO_FTPS;
452 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
453 #else
454 if (transport_restrict_protocols())
455 warning("protocol restrictions not applied to curl redirects because\n"
456 "your curl version is too old (>= 7.19.4)");
457 #endif
458
459 if (getenv("GIT_CURL_VERBOSE"))
460 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
461
462 curl_easy_setopt(result, CURLOPT_USERAGENT,
463 user_agent ? user_agent : git_user_agent());
464
465 if (curl_ftp_no_epsv)
466 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
467
468 #ifdef CURLOPT_USE_SSL
469 if (curl_ssl_try)
470 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
471 #endif
472
473 if (curl_http_proxy) {
474 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
475 #if LIBCURL_VERSION_NUM >= 0x071800
476 if (starts_with(curl_http_proxy, "socks5"))
477 curl_easy_setopt(result,
478 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
479 else if (starts_with(curl_http_proxy, "socks4a"))
480 curl_easy_setopt(result,
481 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
482 else if (starts_with(curl_http_proxy, "socks"))
483 curl_easy_setopt(result,
484 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
485 #endif
486 }
487 #if LIBCURL_VERSION_NUM >= 0x070a07
488 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
489 #endif
490
491 set_curl_keepalive(result);
492
493 return result;
494 }
495
496 static void set_from_env(const char **var, const char *envname)
497 {
498 const char *val = getenv(envname);
499 if (val)
500 *var = val;
501 }
502
503 void http_init(struct remote *remote, const char *url, int proactive_auth)
504 {
505 char *low_speed_limit;
506 char *low_speed_time;
507 char *normalized_url;
508 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
509
510 config.section = "http";
511 config.key = NULL;
512 config.collect_fn = http_options;
513 config.cascade_fn = git_default_config;
514 config.cb = NULL;
515
516 http_is_verbose = 0;
517 normalized_url = url_normalize(url, &config.url);
518
519 git_config(urlmatch_config_entry, &config);
520 free(normalized_url);
521
522 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
523 die("curl_global_init failed");
524
525 http_proactive_auth = proactive_auth;
526
527 if (remote && remote->http_proxy)
528 curl_http_proxy = xstrdup(remote->http_proxy);
529
530 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
531 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
532
533 #ifdef USE_CURL_MULTI
534 {
535 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
536 if (http_max_requests != NULL)
537 max_requests = atoi(http_max_requests);
538 }
539
540 curlm = curl_multi_init();
541 if (!curlm)
542 die("curl_multi_init failed");
543 #endif
544
545 if (getenv("GIT_SSL_NO_VERIFY"))
546 curl_ssl_verify = 0;
547
548 set_from_env(&ssl_cert, "GIT_SSL_CERT");
549 #if LIBCURL_VERSION_NUM >= 0x070903
550 set_from_env(&ssl_key, "GIT_SSL_KEY");
551 #endif
552 #if LIBCURL_VERSION_NUM >= 0x070908
553 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
554 #endif
555 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
556
557 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
558
559 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
560 if (low_speed_limit != NULL)
561 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
562 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
563 if (low_speed_time != NULL)
564 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
565
566 if (curl_ssl_verify == -1)
567 curl_ssl_verify = 1;
568
569 curl_session_count = 0;
570 #ifdef USE_CURL_MULTI
571 if (max_requests < 1)
572 max_requests = DEFAULT_MAX_REQUESTS;
573 #endif
574
575 if (getenv("GIT_CURL_FTP_NO_EPSV"))
576 curl_ftp_no_epsv = 1;
577
578 if (url) {
579 credential_from_url(&http_auth, url);
580 if (!ssl_cert_password_required &&
581 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
582 starts_with(url, "https://"))
583 ssl_cert_password_required = 1;
584 }
585
586 #ifndef NO_CURL_EASY_DUPHANDLE
587 curl_default = get_curl_handle();
588 #endif
589 }
590
591 void http_cleanup(void)
592 {
593 struct active_request_slot *slot = active_queue_head;
594
595 while (slot != NULL) {
596 struct active_request_slot *next = slot->next;
597 if (slot->curl != NULL) {
598 xmulti_remove_handle(slot);
599 curl_easy_cleanup(slot->curl);
600 }
601 free(slot);
602 slot = next;
603 }
604 active_queue_head = NULL;
605
606 #ifndef NO_CURL_EASY_DUPHANDLE
607 curl_easy_cleanup(curl_default);
608 #endif
609
610 #ifdef USE_CURL_MULTI
611 curl_multi_cleanup(curlm);
612 #endif
613 curl_global_cleanup();
614
615 curl_slist_free_all(pragma_header);
616 pragma_header = NULL;
617
618 curl_slist_free_all(no_pragma_header);
619 no_pragma_header = NULL;
620
621 if (curl_http_proxy) {
622 free((void *)curl_http_proxy);
623 curl_http_proxy = NULL;
624 }
625
626 if (cert_auth.password != NULL) {
627 memset(cert_auth.password, 0, strlen(cert_auth.password));
628 free(cert_auth.password);
629 cert_auth.password = NULL;
630 }
631 ssl_cert_password_required = 0;
632
633 free(cached_accept_language);
634 cached_accept_language = NULL;
635 }
636
637 struct active_request_slot *get_active_slot(void)
638 {
639 struct active_request_slot *slot = active_queue_head;
640 struct active_request_slot *newslot;
641
642 #ifdef USE_CURL_MULTI
643 int num_transfers;
644
645 /* Wait for a slot to open up if the queue is full */
646 while (active_requests >= max_requests) {
647 curl_multi_perform(curlm, &num_transfers);
648 if (num_transfers < active_requests)
649 process_curl_messages();
650 }
651 #endif
652
653 while (slot != NULL && slot->in_use)
654 slot = slot->next;
655
656 if (slot == NULL) {
657 newslot = xmalloc(sizeof(*newslot));
658 newslot->curl = NULL;
659 newslot->in_use = 0;
660 newslot->next = NULL;
661
662 slot = active_queue_head;
663 if (slot == NULL) {
664 active_queue_head = newslot;
665 } else {
666 while (slot->next != NULL)
667 slot = slot->next;
668 slot->next = newslot;
669 }
670 slot = newslot;
671 }
672
673 if (slot->curl == NULL) {
674 #ifdef NO_CURL_EASY_DUPHANDLE
675 slot->curl = get_curl_handle();
676 #else
677 slot->curl = curl_easy_duphandle(curl_default);
678 #endif
679 curl_session_count++;
680 }
681
682 active_requests++;
683 slot->in_use = 1;
684 slot->results = NULL;
685 slot->finished = NULL;
686 slot->callback_data = NULL;
687 slot->callback_func = NULL;
688 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
689 if (curl_save_cookies)
690 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
691 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
692 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
693 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
694 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
695 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
696 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
697 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
698 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
699 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
700 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
701 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
702 #endif
703 if (http_auth.password)
704 init_curl_http_auth(slot->curl);
705
706 return slot;
707 }
708
709 int start_active_slot(struct active_request_slot *slot)
710 {
711 #ifdef USE_CURL_MULTI
712 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
713 int num_transfers;
714
715 if (curlm_result != CURLM_OK &&
716 curlm_result != CURLM_CALL_MULTI_PERFORM) {
717 warning("curl_multi_add_handle failed: %s",
718 curl_multi_strerror(curlm_result));
719 active_requests--;
720 slot->in_use = 0;
721 return 0;
722 }
723
724 /*
725 * We know there must be something to do, since we just added
726 * something.
727 */
728 curl_multi_perform(curlm, &num_transfers);
729 #endif
730 return 1;
731 }
732
733 #ifdef USE_CURL_MULTI
734 struct fill_chain {
735 void *data;
736 int (*fill)(void *);
737 struct fill_chain *next;
738 };
739
740 static struct fill_chain *fill_cfg;
741
742 void add_fill_function(void *data, int (*fill)(void *))
743 {
744 struct fill_chain *new = xmalloc(sizeof(*new));
745 struct fill_chain **linkp = &fill_cfg;
746 new->data = data;
747 new->fill = fill;
748 new->next = NULL;
749 while (*linkp)
750 linkp = &(*linkp)->next;
751 *linkp = new;
752 }
753
754 void fill_active_slots(void)
755 {
756 struct active_request_slot *slot = active_queue_head;
757
758 while (active_requests < max_requests) {
759 struct fill_chain *fill;
760 for (fill = fill_cfg; fill; fill = fill->next)
761 if (fill->fill(fill->data))
762 break;
763
764 if (!fill)
765 break;
766 }
767
768 while (slot != NULL) {
769 if (!slot->in_use && slot->curl != NULL
770 && curl_session_count > min_curl_sessions) {
771 curl_easy_cleanup(slot->curl);
772 slot->curl = NULL;
773 curl_session_count--;
774 }
775 slot = slot->next;
776 }
777 }
778
779 void step_active_slots(void)
780 {
781 int num_transfers;
782 CURLMcode curlm_result;
783
784 do {
785 curlm_result = curl_multi_perform(curlm, &num_transfers);
786 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
787 if (num_transfers < active_requests) {
788 process_curl_messages();
789 fill_active_slots();
790 }
791 }
792 #endif
793
794 void run_active_slot(struct active_request_slot *slot)
795 {
796 #ifdef USE_CURL_MULTI
797 fd_set readfds;
798 fd_set writefds;
799 fd_set excfds;
800 int max_fd;
801 struct timeval select_timeout;
802 int finished = 0;
803
804 slot->finished = &finished;
805 while (!finished) {
806 step_active_slots();
807
808 if (slot->in_use) {
809 #if LIBCURL_VERSION_NUM >= 0x070f04
810 long curl_timeout;
811 curl_multi_timeout(curlm, &curl_timeout);
812 if (curl_timeout == 0) {
813 continue;
814 } else if (curl_timeout == -1) {
815 select_timeout.tv_sec = 0;
816 select_timeout.tv_usec = 50000;
817 } else {
818 select_timeout.tv_sec = curl_timeout / 1000;
819 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
820 }
821 #else
822 select_timeout.tv_sec = 0;
823 select_timeout.tv_usec = 50000;
824 #endif
825
826 max_fd = -1;
827 FD_ZERO(&readfds);
828 FD_ZERO(&writefds);
829 FD_ZERO(&excfds);
830 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
831
832 /*
833 * It can happen that curl_multi_timeout returns a pathologically
834 * long timeout when curl_multi_fdset returns no file descriptors
835 * to read. See commit message for more details.
836 */
837 if (max_fd < 0 &&
838 (select_timeout.tv_sec > 0 ||
839 select_timeout.tv_usec > 50000)) {
840 select_timeout.tv_sec = 0;
841 select_timeout.tv_usec = 50000;
842 }
843
844 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
845 }
846 }
847 #else
848 while (slot->in_use) {
849 slot->curl_result = curl_easy_perform(slot->curl);
850 finish_active_slot(slot);
851 }
852 #endif
853 }
854
855 static void release_active_slot(struct active_request_slot *slot)
856 {
857 closedown_active_slot(slot);
858 if (slot->curl && curl_session_count > min_curl_sessions) {
859 xmulti_remove_handle(slot);
860 curl_easy_cleanup(slot->curl);
861 slot->curl = NULL;
862 curl_session_count--;
863 }
864 #ifdef USE_CURL_MULTI
865 fill_active_slots();
866 #endif
867 }
868
869 void finish_all_active_slots(void)
870 {
871 struct active_request_slot *slot = active_queue_head;
872
873 while (slot != NULL)
874 if (slot->in_use) {
875 run_active_slot(slot);
876 slot = active_queue_head;
877 } else {
878 slot = slot->next;
879 }
880 }
881
882 /* Helpers for modifying and creating URLs */
883 static inline int needs_quote(int ch)
884 {
885 if (((ch >= 'A') && (ch <= 'Z'))
886 || ((ch >= 'a') && (ch <= 'z'))
887 || ((ch >= '0') && (ch <= '9'))
888 || (ch == '/')
889 || (ch == '-')
890 || (ch == '.'))
891 return 0;
892 return 1;
893 }
894
895 static char *quote_ref_url(const char *base, const char *ref)
896 {
897 struct strbuf buf = STRBUF_INIT;
898 const char *cp;
899 int ch;
900
901 end_url_with_slash(&buf, base);
902
903 for (cp = ref; (ch = *cp) != 0; cp++)
904 if (needs_quote(ch))
905 strbuf_addf(&buf, "%%%02x", ch);
906 else
907 strbuf_addch(&buf, *cp);
908
909 return strbuf_detach(&buf, NULL);
910 }
911
912 void append_remote_object_url(struct strbuf *buf, const char *url,
913 const char *hex,
914 int only_two_digit_prefix)
915 {
916 end_url_with_slash(buf, url);
917
918 strbuf_addf(buf, "objects/%.*s/", 2, hex);
919 if (!only_two_digit_prefix)
920 strbuf_addf(buf, "%s", hex+2);
921 }
922
923 char *get_remote_object_url(const char *url, const char *hex,
924 int only_two_digit_prefix)
925 {
926 struct strbuf buf = STRBUF_INIT;
927 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
928 return strbuf_detach(&buf, NULL);
929 }
930
931 static int handle_curl_result(struct slot_results *results)
932 {
933 /*
934 * If we see a failing http code with CURLE_OK, we have turned off
935 * FAILONERROR (to keep the server's custom error response), and should
936 * translate the code into failure here.
937 */
938 if (results->curl_result == CURLE_OK &&
939 results->http_code >= 400) {
940 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
941 /*
942 * Normally curl will already have put the "reason phrase"
943 * from the server into curl_errorstr; unfortunately without
944 * FAILONERROR it is lost, so we can give only the numeric
945 * status code.
946 */
947 snprintf(curl_errorstr, sizeof(curl_errorstr),
948 "The requested URL returned error: %ld",
949 results->http_code);
950 }
951
952 if (results->curl_result == CURLE_OK) {
953 credential_approve(&http_auth);
954 return HTTP_OK;
955 } else if (missing_target(results))
956 return HTTP_MISSING_TARGET;
957 else if (results->http_code == 401) {
958 if (http_auth.username && http_auth.password) {
959 credential_reject(&http_auth);
960 return HTTP_NOAUTH;
961 } else {
962 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
963 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
964 #endif
965 return HTTP_REAUTH;
966 }
967 } else {
968 #if LIBCURL_VERSION_NUM >= 0x070c00
969 if (!curl_errorstr[0])
970 strlcpy(curl_errorstr,
971 curl_easy_strerror(results->curl_result),
972 sizeof(curl_errorstr));
973 #endif
974 return HTTP_ERROR;
975 }
976 }
977
978 int run_one_slot(struct active_request_slot *slot,
979 struct slot_results *results)
980 {
981 slot->results = results;
982 if (!start_active_slot(slot)) {
983 snprintf(curl_errorstr, sizeof(curl_errorstr),
984 "failed to start HTTP request");
985 return HTTP_START_FAILED;
986 }
987
988 run_active_slot(slot);
989 return handle_curl_result(results);
990 }
991
992 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
993 {
994 char *ptr;
995 CURLcode ret;
996
997 strbuf_reset(buf);
998 ret = curl_easy_getinfo(curl, info, &ptr);
999 if (!ret && ptr)
1000 strbuf_addstr(buf, ptr);
1001 return ret;
1002 }
1003
1004 /*
1005 * Check for and extract a content-type parameter. "raw"
1006 * should be positioned at the start of the potential
1007 * parameter, with any whitespace already removed.
1008 *
1009 * "name" is the name of the parameter. The value is appended
1010 * to "out".
1011 */
1012 static int extract_param(const char *raw, const char *name,
1013 struct strbuf *out)
1014 {
1015 size_t len = strlen(name);
1016
1017 if (strncasecmp(raw, name, len))
1018 return -1;
1019 raw += len;
1020
1021 if (*raw != '=')
1022 return -1;
1023 raw++;
1024
1025 while (*raw && !isspace(*raw) && *raw != ';')
1026 strbuf_addch(out, *raw++);
1027 return 0;
1028 }
1029
1030 /*
1031 * Extract a normalized version of the content type, with any
1032 * spaces suppressed, all letters lowercased, and no trailing ";"
1033 * or parameters.
1034 *
1035 * Note that we will silently remove even invalid whitespace. For
1036 * example, "text / plain" is specifically forbidden by RFC 2616,
1037 * but "text/plain" is the only reasonable output, and this keeps
1038 * our code simple.
1039 *
1040 * If the "charset" argument is not NULL, store the value of any
1041 * charset parameter there.
1042 *
1043 * Example:
1044 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1045 * "text / plain" -> "text/plain"
1046 */
1047 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1048 struct strbuf *charset)
1049 {
1050 const char *p;
1051
1052 strbuf_reset(type);
1053 strbuf_grow(type, raw->len);
1054 for (p = raw->buf; *p; p++) {
1055 if (isspace(*p))
1056 continue;
1057 if (*p == ';') {
1058 p++;
1059 break;
1060 }
1061 strbuf_addch(type, tolower(*p));
1062 }
1063
1064 if (!charset)
1065 return;
1066
1067 strbuf_reset(charset);
1068 while (*p) {
1069 while (isspace(*p) || *p == ';')
1070 p++;
1071 if (!extract_param(p, "charset", charset))
1072 return;
1073 while (*p && !isspace(*p))
1074 p++;
1075 }
1076
1077 if (!charset->len && starts_with(type->buf, "text/"))
1078 strbuf_addstr(charset, "ISO-8859-1");
1079 }
1080
1081 static void write_accept_language(struct strbuf *buf)
1082 {
1083 /*
1084 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1085 * that, q-value will be smaller than 0.001, the minimum q-value the
1086 * HTTP specification allows. See
1087 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1088 */
1089 const int MAX_DECIMAL_PLACES = 3;
1090 const int MAX_LANGUAGE_TAGS = 1000;
1091 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1092 char **language_tags = NULL;
1093 int num_langs = 0;
1094 const char *s = get_preferred_languages();
1095 int i;
1096 struct strbuf tag = STRBUF_INIT;
1097
1098 /* Don't add Accept-Language header if no language is preferred. */
1099 if (!s)
1100 return;
1101
1102 /*
1103 * Split the colon-separated string of preferred languages into
1104 * language_tags array.
1105 */
1106 do {
1107 /* collect language tag */
1108 for (; *s && (isalnum(*s) || *s == '_'); s++)
1109 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1110
1111 /* skip .codeset, @modifier and any other unnecessary parts */
1112 while (*s && *s != ':')
1113 s++;
1114
1115 if (tag.len) {
1116 num_langs++;
1117 REALLOC_ARRAY(language_tags, num_langs);
1118 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1119 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1120 break;
1121 }
1122 } while (*s++);
1123
1124 /* write Accept-Language header into buf */
1125 if (num_langs) {
1126 int last_buf_len = 0;
1127 int max_q;
1128 int decimal_places;
1129 char q_format[32];
1130
1131 /* add '*' */
1132 REALLOC_ARRAY(language_tags, num_langs + 1);
1133 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1134
1135 /* compute decimal_places */
1136 for (max_q = 1, decimal_places = 0;
1137 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1138 decimal_places++, max_q *= 10)
1139 ;
1140
1141 sprintf(q_format, ";q=0.%%0%dd", decimal_places);
1142
1143 strbuf_addstr(buf, "Accept-Language: ");
1144
1145 for (i = 0; i < num_langs; i++) {
1146 if (i > 0)
1147 strbuf_addstr(buf, ", ");
1148
1149 strbuf_addstr(buf, language_tags[i]);
1150
1151 if (i > 0)
1152 strbuf_addf(buf, q_format, max_q - i);
1153
1154 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1155 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1156 break;
1157 }
1158
1159 last_buf_len = buf->len;
1160 }
1161 }
1162
1163 /* free language tags -- last one is a static '*' */
1164 for (i = 0; i < num_langs - 1; i++)
1165 free(language_tags[i]);
1166 free(language_tags);
1167 }
1168
1169 /*
1170 * Get an Accept-Language header which indicates user's preferred languages.
1171 *
1172 * Examples:
1173 * LANGUAGE= -> ""
1174 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1175 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1176 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1177 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1178 * LANGUAGE= LANG=C -> ""
1179 */
1180 static const char *get_accept_language(void)
1181 {
1182 if (!cached_accept_language) {
1183 struct strbuf buf = STRBUF_INIT;
1184 write_accept_language(&buf);
1185 if (buf.len > 0)
1186 cached_accept_language = strbuf_detach(&buf, NULL);
1187 }
1188
1189 return cached_accept_language;
1190 }
1191
1192 /* http_request() targets */
1193 #define HTTP_REQUEST_STRBUF 0
1194 #define HTTP_REQUEST_FILE 1
1195
1196 static int http_request(const char *url,
1197 void *result, int target,
1198 const struct http_get_options *options)
1199 {
1200 struct active_request_slot *slot;
1201 struct slot_results results;
1202 struct curl_slist *headers = NULL;
1203 struct strbuf buf = STRBUF_INIT;
1204 const char *accept_language;
1205 int ret;
1206
1207 slot = get_active_slot();
1208 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1209
1210 if (result == NULL) {
1211 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1212 } else {
1213 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1214 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1215
1216 if (target == HTTP_REQUEST_FILE) {
1217 long posn = ftell(result);
1218 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1219 fwrite);
1220 if (posn > 0) {
1221 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1222 headers = curl_slist_append(headers, buf.buf);
1223 strbuf_reset(&buf);
1224 }
1225 } else
1226 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1227 fwrite_buffer);
1228 }
1229
1230 accept_language = get_accept_language();
1231
1232 if (accept_language)
1233 headers = curl_slist_append(headers, accept_language);
1234
1235 strbuf_addstr(&buf, "Pragma:");
1236 if (options && options->no_cache)
1237 strbuf_addstr(&buf, " no-cache");
1238 if (options && options->keep_error)
1239 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1240
1241 headers = curl_slist_append(headers, buf.buf);
1242
1243 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1244 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1245 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1246
1247 ret = run_one_slot(slot, &results);
1248
1249 if (options && options->content_type) {
1250 struct strbuf raw = STRBUF_INIT;
1251 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1252 extract_content_type(&raw, options->content_type,
1253 options->charset);
1254 strbuf_release(&raw);
1255 }
1256
1257 if (options && options->effective_url)
1258 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1259 options->effective_url);
1260
1261 curl_slist_free_all(headers);
1262 strbuf_release(&buf);
1263
1264 return ret;
1265 }
1266
1267 /*
1268 * Update the "base" url to a more appropriate value, as deduced by
1269 * redirects seen when requesting a URL starting with "url".
1270 *
1271 * The "asked" parameter is a URL that we asked curl to access, and must begin
1272 * with "base".
1273 *
1274 * The "got" parameter is the URL that curl reported to us as where we ended
1275 * up.
1276 *
1277 * Returns 1 if we updated the base url, 0 otherwise.
1278 *
1279 * Our basic strategy is to compare "base" and "asked" to find the bits
1280 * specific to our request. We then strip those bits off of "got" to yield the
1281 * new base. So for example, if our base is "http://example.com/foo.git",
1282 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1283 * with "https://other.example.com/foo.git/info/refs". We would want the
1284 * new URL to become "https://other.example.com/foo.git".
1285 *
1286 * Note that this assumes a sane redirect scheme. It's entirely possible
1287 * in the example above to end up at a URL that does not even end in
1288 * "info/refs". In such a case we simply punt, as there is not much we can
1289 * do (and such a scheme is unlikely to represent a real git repository,
1290 * which means we are likely about to abort anyway).
1291 */
1292 static int update_url_from_redirect(struct strbuf *base,
1293 const char *asked,
1294 const struct strbuf *got)
1295 {
1296 const char *tail;
1297 size_t tail_len;
1298
1299 if (!strcmp(asked, got->buf))
1300 return 0;
1301
1302 if (!skip_prefix(asked, base->buf, &tail))
1303 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1304 asked, base->buf);
1305
1306 tail_len = strlen(tail);
1307
1308 if (got->len < tail_len ||
1309 strcmp(tail, got->buf + got->len - tail_len))
1310 return 0; /* insane redirect scheme */
1311
1312 strbuf_reset(base);
1313 strbuf_add(base, got->buf, got->len - tail_len);
1314 return 1;
1315 }
1316
1317 static int http_request_reauth(const char *url,
1318 void *result, int target,
1319 struct http_get_options *options)
1320 {
1321 int ret = http_request(url, result, target, options);
1322
1323 if (options && options->effective_url && options->base_url) {
1324 if (update_url_from_redirect(options->base_url,
1325 url, options->effective_url)) {
1326 credential_from_url(&http_auth, options->base_url->buf);
1327 url = options->effective_url->buf;
1328 }
1329 }
1330
1331 if (ret != HTTP_REAUTH)
1332 return ret;
1333
1334 /*
1335 * If we are using KEEP_ERROR, the previous request may have
1336 * put cruft into our output stream; we should clear it out before
1337 * making our next request. We only know how to do this for
1338 * the strbuf case, but that is enough to satisfy current callers.
1339 */
1340 if (options && options->keep_error) {
1341 switch (target) {
1342 case HTTP_REQUEST_STRBUF:
1343 strbuf_reset(result);
1344 break;
1345 default:
1346 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1347 }
1348 }
1349
1350 credential_fill(&http_auth);
1351
1352 return http_request(url, result, target, options);
1353 }
1354
1355 int http_get_strbuf(const char *url,
1356 struct strbuf *result,
1357 struct http_get_options *options)
1358 {
1359 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1360 }
1361
1362 /*
1363 * Downloads a URL and stores the result in the given file.
1364 *
1365 * If a previous interrupted download is detected (i.e. a previous temporary
1366 * file is still around) the download is resumed.
1367 */
1368 static int http_get_file(const char *url, const char *filename,
1369 struct http_get_options *options)
1370 {
1371 int ret;
1372 struct strbuf tmpfile = STRBUF_INIT;
1373 FILE *result;
1374
1375 strbuf_addf(&tmpfile, "%s.temp", filename);
1376 result = fopen(tmpfile.buf, "a");
1377 if (!result) {
1378 error("Unable to open local file %s", tmpfile.buf);
1379 ret = HTTP_ERROR;
1380 goto cleanup;
1381 }
1382
1383 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1384 fclose(result);
1385
1386 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1387 ret = HTTP_ERROR;
1388 cleanup:
1389 strbuf_release(&tmpfile);
1390 return ret;
1391 }
1392
1393 int http_fetch_ref(const char *base, struct ref *ref)
1394 {
1395 struct http_get_options options = {0};
1396 char *url;
1397 struct strbuf buffer = STRBUF_INIT;
1398 int ret = -1;
1399
1400 options.no_cache = 1;
1401
1402 url = quote_ref_url(base, ref->name);
1403 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1404 strbuf_rtrim(&buffer);
1405 if (buffer.len == 40)
1406 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1407 else if (starts_with(buffer.buf, "ref: ")) {
1408 ref->symref = xstrdup(buffer.buf + 5);
1409 ret = 0;
1410 }
1411 }
1412
1413 strbuf_release(&buffer);
1414 free(url);
1415 return ret;
1416 }
1417
1418 /* Helpers for fetching packs */
1419 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1420 {
1421 char *url, *tmp;
1422 struct strbuf buf = STRBUF_INIT;
1423
1424 if (http_is_verbose)
1425 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1426
1427 end_url_with_slash(&buf, base_url);
1428 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1429 url = strbuf_detach(&buf, NULL);
1430
1431 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1432 tmp = strbuf_detach(&buf, NULL);
1433
1434 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1435 error("Unable to get pack index %s", url);
1436 free(tmp);
1437 tmp = NULL;
1438 }
1439
1440 free(url);
1441 return tmp;
1442 }
1443
1444 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1445 unsigned char *sha1, const char *base_url)
1446 {
1447 struct packed_git *new_pack;
1448 char *tmp_idx = NULL;
1449 int ret;
1450
1451 if (has_pack_index(sha1)) {
1452 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1453 if (!new_pack)
1454 return -1; /* parse_pack_index() already issued error message */
1455 goto add_pack;
1456 }
1457
1458 tmp_idx = fetch_pack_index(sha1, base_url);
1459 if (!tmp_idx)
1460 return -1;
1461
1462 new_pack = parse_pack_index(sha1, tmp_idx);
1463 if (!new_pack) {
1464 unlink(tmp_idx);
1465 free(tmp_idx);
1466
1467 return -1; /* parse_pack_index() already issued error message */
1468 }
1469
1470 ret = verify_pack_index(new_pack);
1471 if (!ret) {
1472 close_pack_index(new_pack);
1473 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1474 }
1475 free(tmp_idx);
1476 if (ret)
1477 return -1;
1478
1479 add_pack:
1480 new_pack->next = *packs_head;
1481 *packs_head = new_pack;
1482 return 0;
1483 }
1484
1485 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1486 {
1487 struct http_get_options options = {0};
1488 int ret = 0, i = 0;
1489 char *url, *data;
1490 struct strbuf buf = STRBUF_INIT;
1491 unsigned char sha1[20];
1492
1493 end_url_with_slash(&buf, base_url);
1494 strbuf_addstr(&buf, "objects/info/packs");
1495 url = strbuf_detach(&buf, NULL);
1496
1497 options.no_cache = 1;
1498 ret = http_get_strbuf(url, &buf, &options);
1499 if (ret != HTTP_OK)
1500 goto cleanup;
1501
1502 data = buf.buf;
1503 while (i < buf.len) {
1504 switch (data[i]) {
1505 case 'P':
1506 i++;
1507 if (i + 52 <= buf.len &&
1508 starts_with(data + i, " pack-") &&
1509 starts_with(data + i + 46, ".pack\n")) {
1510 get_sha1_hex(data + i + 6, sha1);
1511 fetch_and_setup_pack_index(packs_head, sha1,
1512 base_url);
1513 i += 51;
1514 break;
1515 }
1516 default:
1517 while (i < buf.len && data[i] != '\n')
1518 i++;
1519 }
1520 i++;
1521 }
1522
1523 cleanup:
1524 free(url);
1525 return ret;
1526 }
1527
1528 void release_http_pack_request(struct http_pack_request *preq)
1529 {
1530 if (preq->packfile != NULL) {
1531 fclose(preq->packfile);
1532 preq->packfile = NULL;
1533 }
1534 if (preq->range_header != NULL) {
1535 curl_slist_free_all(preq->range_header);
1536 preq->range_header = NULL;
1537 }
1538 preq->slot = NULL;
1539 free(preq->url);
1540 free(preq);
1541 }
1542
1543 int finish_http_pack_request(struct http_pack_request *preq)
1544 {
1545 struct packed_git **lst;
1546 struct packed_git *p = preq->target;
1547 char *tmp_idx;
1548 struct child_process ip = CHILD_PROCESS_INIT;
1549 const char *ip_argv[8];
1550
1551 close_pack_index(p);
1552
1553 fclose(preq->packfile);
1554 preq->packfile = NULL;
1555
1556 lst = preq->lst;
1557 while (*lst != p)
1558 lst = &((*lst)->next);
1559 *lst = (*lst)->next;
1560
1561 tmp_idx = xstrdup(preq->tmpfile);
1562 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1563 ".idx.temp");
1564
1565 ip_argv[0] = "index-pack";
1566 ip_argv[1] = "-o";
1567 ip_argv[2] = tmp_idx;
1568 ip_argv[3] = preq->tmpfile;
1569 ip_argv[4] = NULL;
1570
1571 ip.argv = ip_argv;
1572 ip.git_cmd = 1;
1573 ip.no_stdin = 1;
1574 ip.no_stdout = 1;
1575
1576 if (run_command(&ip)) {
1577 unlink(preq->tmpfile);
1578 unlink(tmp_idx);
1579 free(tmp_idx);
1580 return -1;
1581 }
1582
1583 unlink(sha1_pack_index_name(p->sha1));
1584
1585 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1586 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1587 free(tmp_idx);
1588 return -1;
1589 }
1590
1591 install_packed_git(p);
1592 free(tmp_idx);
1593 return 0;
1594 }
1595
1596 struct http_pack_request *new_http_pack_request(
1597 struct packed_git *target, const char *base_url)
1598 {
1599 long prev_posn = 0;
1600 char range[RANGE_HEADER_SIZE];
1601 struct strbuf buf = STRBUF_INIT;
1602 struct http_pack_request *preq;
1603
1604 preq = xcalloc(1, sizeof(*preq));
1605 preq->target = target;
1606
1607 end_url_with_slash(&buf, base_url);
1608 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1609 sha1_to_hex(target->sha1));
1610 preq->url = strbuf_detach(&buf, NULL);
1611
1612 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1613 sha1_pack_name(target->sha1));
1614 preq->packfile = fopen(preq->tmpfile, "a");
1615 if (!preq->packfile) {
1616 error("Unable to open local file %s for pack",
1617 preq->tmpfile);
1618 goto abort;
1619 }
1620
1621 preq->slot = get_active_slot();
1622 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1623 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1624 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1625 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1626 no_pragma_header);
1627
1628 /*
1629 * If there is data present from a previous transfer attempt,
1630 * resume where it left off
1631 */
1632 prev_posn = ftell(preq->packfile);
1633 if (prev_posn>0) {
1634 if (http_is_verbose)
1635 fprintf(stderr,
1636 "Resuming fetch of pack %s at byte %ld\n",
1637 sha1_to_hex(target->sha1), prev_posn);
1638 sprintf(range, "Range: bytes=%ld-", prev_posn);
1639 preq->range_header = curl_slist_append(NULL, range);
1640 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1641 preq->range_header);
1642 }
1643
1644 return preq;
1645
1646 abort:
1647 free(preq->url);
1648 free(preq);
1649 return NULL;
1650 }
1651
1652 /* Helpers for fetching objects (loose) */
1653 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1654 void *data)
1655 {
1656 unsigned char expn[4096];
1657 size_t size = eltsize * nmemb;
1658 int posn = 0;
1659 struct http_object_request *freq =
1660 (struct http_object_request *)data;
1661 do {
1662 ssize_t retval = xwrite(freq->localfile,
1663 (char *) ptr + posn, size - posn);
1664 if (retval < 0)
1665 return posn;
1666 posn += retval;
1667 } while (posn < size);
1668
1669 freq->stream.avail_in = size;
1670 freq->stream.next_in = (void *)ptr;
1671 do {
1672 freq->stream.next_out = expn;
1673 freq->stream.avail_out = sizeof(expn);
1674 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1675 git_SHA1_Update(&freq->c, expn,
1676 sizeof(expn) - freq->stream.avail_out);
1677 } while (freq->stream.avail_in && freq->zret == Z_OK);
1678 return size;
1679 }
1680
1681 struct http_object_request *new_http_object_request(const char *base_url,
1682 unsigned char *sha1)
1683 {
1684 char *hex = sha1_to_hex(sha1);
1685 const char *filename;
1686 char prevfile[PATH_MAX];
1687 int prevlocal;
1688 char prev_buf[PREV_BUF_SIZE];
1689 ssize_t prev_read = 0;
1690 long prev_posn = 0;
1691 char range[RANGE_HEADER_SIZE];
1692 struct curl_slist *range_header = NULL;
1693 struct http_object_request *freq;
1694
1695 freq = xcalloc(1, sizeof(*freq));
1696 hashcpy(freq->sha1, sha1);
1697 freq->localfile = -1;
1698
1699 filename = sha1_file_name(sha1);
1700 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1701 "%s.temp", filename);
1702
1703 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1704 unlink_or_warn(prevfile);
1705 rename(freq->tmpfile, prevfile);
1706 unlink_or_warn(freq->tmpfile);
1707
1708 if (freq->localfile != -1)
1709 error("fd leakage in start: %d", freq->localfile);
1710 freq->localfile = open(freq->tmpfile,
1711 O_WRONLY | O_CREAT | O_EXCL, 0666);
1712 /*
1713 * This could have failed due to the "lazy directory creation";
1714 * try to mkdir the last path component.
1715 */
1716 if (freq->localfile < 0 && errno == ENOENT) {
1717 char *dir = strrchr(freq->tmpfile, '/');
1718 if (dir) {
1719 *dir = 0;
1720 mkdir(freq->tmpfile, 0777);
1721 *dir = '/';
1722 }
1723 freq->localfile = open(freq->tmpfile,
1724 O_WRONLY | O_CREAT | O_EXCL, 0666);
1725 }
1726
1727 if (freq->localfile < 0) {
1728 error("Couldn't create temporary file %s: %s",
1729 freq->tmpfile, strerror(errno));
1730 goto abort;
1731 }
1732
1733 git_inflate_init(&freq->stream);
1734
1735 git_SHA1_Init(&freq->c);
1736
1737 freq->url = get_remote_object_url(base_url, hex, 0);
1738
1739 /*
1740 * If a previous temp file is present, process what was already
1741 * fetched.
1742 */
1743 prevlocal = open(prevfile, O_RDONLY);
1744 if (prevlocal != -1) {
1745 do {
1746 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1747 if (prev_read>0) {
1748 if (fwrite_sha1_file(prev_buf,
1749 1,
1750 prev_read,
1751 freq) == prev_read) {
1752 prev_posn += prev_read;
1753 } else {
1754 prev_read = -1;
1755 }
1756 }
1757 } while (prev_read > 0);
1758 close(prevlocal);
1759 }
1760 unlink_or_warn(prevfile);
1761
1762 /*
1763 * Reset inflate/SHA1 if there was an error reading the previous temp
1764 * file; also rewind to the beginning of the local file.
1765 */
1766 if (prev_read == -1) {
1767 memset(&freq->stream, 0, sizeof(freq->stream));
1768 git_inflate_init(&freq->stream);
1769 git_SHA1_Init(&freq->c);
1770 if (prev_posn>0) {
1771 prev_posn = 0;
1772 lseek(freq->localfile, 0, SEEK_SET);
1773 if (ftruncate(freq->localfile, 0) < 0) {
1774 error("Couldn't truncate temporary file %s: %s",
1775 freq->tmpfile, strerror(errno));
1776 goto abort;
1777 }
1778 }
1779 }
1780
1781 freq->slot = get_active_slot();
1782
1783 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1784 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1785 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1786 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1787 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1788
1789 /*
1790 * If we have successfully processed data from a previous fetch
1791 * attempt, only fetch the data we don't already have.
1792 */
1793 if (prev_posn>0) {
1794 if (http_is_verbose)
1795 fprintf(stderr,
1796 "Resuming fetch of object %s at byte %ld\n",
1797 hex, prev_posn);
1798 sprintf(range, "Range: bytes=%ld-", prev_posn);
1799 range_header = curl_slist_append(range_header, range);
1800 curl_easy_setopt(freq->slot->curl,
1801 CURLOPT_HTTPHEADER, range_header);
1802 }
1803
1804 return freq;
1805
1806 abort:
1807 free(freq->url);
1808 free(freq);
1809 return NULL;
1810 }
1811
1812 void process_http_object_request(struct http_object_request *freq)
1813 {
1814 if (freq->slot == NULL)
1815 return;
1816 freq->curl_result = freq->slot->curl_result;
1817 freq->http_code = freq->slot->http_code;
1818 freq->slot = NULL;
1819 }
1820
1821 int finish_http_object_request(struct http_object_request *freq)
1822 {
1823 struct stat st;
1824
1825 close(freq->localfile);
1826 freq->localfile = -1;
1827
1828 process_http_object_request(freq);
1829
1830 if (freq->http_code == 416) {
1831 warning("requested range invalid; we may already have all the data.");
1832 } else if (freq->curl_result != CURLE_OK) {
1833 if (stat(freq->tmpfile, &st) == 0)
1834 if (st.st_size == 0)
1835 unlink_or_warn(freq->tmpfile);
1836 return -1;
1837 }
1838
1839 git_inflate_end(&freq->stream);
1840 git_SHA1_Final(freq->real_sha1, &freq->c);
1841 if (freq->zret != Z_STREAM_END) {
1842 unlink_or_warn(freq->tmpfile);
1843 return -1;
1844 }
1845 if (hashcmp(freq->sha1, freq->real_sha1)) {
1846 unlink_or_warn(freq->tmpfile);
1847 return -1;
1848 }
1849 freq->rename =
1850 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
1851
1852 return freq->rename;
1853 }
1854
1855 void abort_http_object_request(struct http_object_request *freq)
1856 {
1857 unlink_or_warn(freq->tmpfile);
1858
1859 release_http_object_request(freq);
1860 }
1861
1862 void release_http_object_request(struct http_object_request *freq)
1863 {
1864 if (freq->localfile != -1) {
1865 close(freq->localfile);
1866 freq->localfile = -1;
1867 }
1868 if (freq->url != NULL) {
1869 free(freq->url);
1870 freq->url = NULL;
1871 }
1872 if (freq->slot != NULL) {
1873 freq->slot->callback_func = NULL;
1874 freq->slot->callback_data = NULL;
1875 release_active_slot(freq->slot);
1876 freq->slot = NULL;
1877 }
1878 }
The Best VCS Around