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Merge branch 'rs/status-detached-head-memcmp' into maint
[git/gitweb.git] / http.c
blobc29ce81ccc0432a80ac5d228d975f246ca47f4b4
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 #ifdef USE_CURL_MULTI
171 static void process_curl_messages(void)
172 {
173 int num_messages;
174 struct active_request_slot *slot;
175 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
176
177 while (curl_message != NULL) {
178 if (curl_message->msg == CURLMSG_DONE) {
179 int curl_result = curl_message->data.result;
180 slot = active_queue_head;
181 while (slot != NULL &&
182 slot->curl != curl_message->easy_handle)
183 slot = slot->next;
184 if (slot != NULL) {
185 curl_multi_remove_handle(curlm, slot->curl);
186 slot->curl_result = curl_result;
187 finish_active_slot(slot);
188 } else {
189 fprintf(stderr, "Received DONE message for unknown request!\n");
190 }
191 } else {
192 fprintf(stderr, "Unknown CURL message received: %d\n",
193 (int)curl_message->msg);
194 }
195 curl_message = curl_multi_info_read(curlm, &num_messages);
196 }
197 }
198 #endif
199
200 static int http_options(const char *var, const char *value, void *cb)
201 {
202 if (!strcmp("http.sslverify", var)) {
203 curl_ssl_verify = git_config_bool(var, value);
204 return 0;
205 }
206 if (!strcmp("http.sslcipherlist", var))
207 return git_config_string(&ssl_cipherlist, var, value);
208 if (!strcmp("http.sslversion", var))
209 return git_config_string(&ssl_version, var, value);
210 if (!strcmp("http.sslcert", var))
211 return git_config_string(&ssl_cert, var, value);
212 #if LIBCURL_VERSION_NUM >= 0x070903
213 if (!strcmp("http.sslkey", var))
214 return git_config_string(&ssl_key, var, value);
215 #endif
216 #if LIBCURL_VERSION_NUM >= 0x070908
217 if (!strcmp("http.sslcapath", var))
218 return git_config_pathname(&ssl_capath, var, value);
219 #endif
220 if (!strcmp("http.sslcainfo", var))
221 return git_config_pathname(&ssl_cainfo, var, value);
222 if (!strcmp("http.sslcertpasswordprotected", var)) {
223 ssl_cert_password_required = git_config_bool(var, value);
224 return 0;
225 }
226 if (!strcmp("http.ssltry", var)) {
227 curl_ssl_try = git_config_bool(var, value);
228 return 0;
229 }
230 if (!strcmp("http.minsessions", var)) {
231 min_curl_sessions = git_config_int(var, value);
232 #ifndef USE_CURL_MULTI
233 if (min_curl_sessions > 1)
234 min_curl_sessions = 1;
235 #endif
236 return 0;
237 }
238 #ifdef USE_CURL_MULTI
239 if (!strcmp("http.maxrequests", var)) {
240 max_requests = git_config_int(var, value);
241 return 0;
242 }
243 #endif
244 if (!strcmp("http.lowspeedlimit", var)) {
245 curl_low_speed_limit = (long)git_config_int(var, value);
246 return 0;
247 }
248 if (!strcmp("http.lowspeedtime", var)) {
249 curl_low_speed_time = (long)git_config_int(var, value);
250 return 0;
251 }
252
253 if (!strcmp("http.noepsv", var)) {
254 curl_ftp_no_epsv = git_config_bool(var, value);
255 return 0;
256 }
257 if (!strcmp("http.proxy", var))
258 return git_config_string(&curl_http_proxy, var, value);
259
260 if (!strcmp("http.cookiefile", var))
261 return git_config_string(&curl_cookie_file, var, value);
262 if (!strcmp("http.savecookies", var)) {
263 curl_save_cookies = git_config_bool(var, value);
264 return 0;
265 }
266
267 if (!strcmp("http.postbuffer", var)) {
268 http_post_buffer = git_config_int(var, value);
269 if (http_post_buffer < LARGE_PACKET_MAX)
270 http_post_buffer = LARGE_PACKET_MAX;
271 return 0;
272 }
273
274 if (!strcmp("http.useragent", var))
275 return git_config_string(&user_agent, var, value);
276
277 /* Fall back on the default ones */
278 return git_default_config(var, value, cb);
279 }
280
281 static void init_curl_http_auth(CURL *result)
282 {
283 if (!http_auth.username)
284 return;
285
286 credential_fill(&http_auth);
287
288 #if LIBCURL_VERSION_NUM >= 0x071301
289 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
290 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
291 #else
292 {
293 static struct strbuf up = STRBUF_INIT;
294 /*
295 * Note that we assume we only ever have a single set of
296 * credentials in a given program run, so we do not have
297 * to worry about updating this buffer, only setting its
298 * initial value.
299 */
300 if (!up.len)
301 strbuf_addf(&up, "%s:%s",
302 http_auth.username, http_auth.password);
303 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
304 }
305 #endif
306 }
307
308 static int has_cert_password(void)
309 {
310 if (ssl_cert == NULL || ssl_cert_password_required != 1)
311 return 0;
312 if (!cert_auth.password) {
313 cert_auth.protocol = xstrdup("cert");
314 cert_auth.username = xstrdup("");
315 cert_auth.path = xstrdup(ssl_cert);
316 credential_fill(&cert_auth);
317 }
318 return 1;
319 }
320
321 #if LIBCURL_VERSION_NUM >= 0x071900
322 static void set_curl_keepalive(CURL *c)
323 {
324 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
325 }
326
327 #elif LIBCURL_VERSION_NUM >= 0x071000
328 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
329 {
330 int ka = 1;
331 int rc;
332 socklen_t len = (socklen_t)sizeof(ka);
333
334 if (type != CURLSOCKTYPE_IPCXN)
335 return 0;
336
337 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
338 if (rc < 0)
339 warning("unable to set SO_KEEPALIVE on socket %s",
340 strerror(errno));
341
342 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
343 }
344
345 static void set_curl_keepalive(CURL *c)
346 {
347 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
348 }
349
350 #else
351 static void set_curl_keepalive(CURL *c)
352 {
353 /* not supported on older curl versions */
354 }
355 #endif
356
357 static CURL *get_curl_handle(void)
358 {
359 CURL *result = curl_easy_init();
360 long allowed_protocols = 0;
361
362 if (!result)
363 die("curl_easy_init failed");
364
365 if (!curl_ssl_verify) {
366 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
367 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
368 } else {
369 /* Verify authenticity of the peer's certificate */
370 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
371 /* The name in the cert must match whom we tried to connect */
372 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
373 }
374
375 #if LIBCURL_VERSION_NUM >= 0x070907
376 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
377 #endif
378 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
379 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
380 #endif
381
382 if (http_proactive_auth)
383 init_curl_http_auth(result);
384
385 if (getenv("GIT_SSL_VERSION"))
386 ssl_version = getenv("GIT_SSL_VERSION");
387 if (ssl_version && *ssl_version) {
388 int i;
389 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
390 if (!strcmp(ssl_version, sslversions[i].name)) {
391 curl_easy_setopt(result, CURLOPT_SSLVERSION,
392 sslversions[i].ssl_version);
393 break;
394 }
395 }
396 if (i == ARRAY_SIZE(sslversions))
397 warning("unsupported ssl version %s: using default",
398 ssl_version);
399 }
400
401 if (getenv("GIT_SSL_CIPHER_LIST"))
402 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
403 if (ssl_cipherlist != NULL && *ssl_cipherlist)
404 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
405 ssl_cipherlist);
406
407 if (ssl_cert != NULL)
408 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
409 if (has_cert_password())
410 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
411 #if LIBCURL_VERSION_NUM >= 0x070903
412 if (ssl_key != NULL)
413 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
414 #endif
415 #if LIBCURL_VERSION_NUM >= 0x070908
416 if (ssl_capath != NULL)
417 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
418 #endif
419 if (ssl_cainfo != NULL)
420 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
421
422 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
423 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
424 curl_low_speed_limit);
425 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
426 curl_low_speed_time);
427 }
428
429 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
430 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
431 #if LIBCURL_VERSION_NUM >= 0x071301
432 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
433 #elif LIBCURL_VERSION_NUM >= 0x071101
434 curl_easy_setopt(result, CURLOPT_POST301, 1);
435 #endif
436 #if LIBCURL_VERSION_NUM >= 0x071304
437 if (is_transport_allowed("http"))
438 allowed_protocols |= CURLPROTO_HTTP;
439 if (is_transport_allowed("https"))
440 allowed_protocols |= CURLPROTO_HTTPS;
441 if (is_transport_allowed("ftp"))
442 allowed_protocols |= CURLPROTO_FTP;
443 if (is_transport_allowed("ftps"))
444 allowed_protocols |= CURLPROTO_FTPS;
445 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
446 #else
447 if (transport_restrict_protocols())
448 warning("protocol restrictions not applied to curl redirects because\n"
449 "your curl version is too old (>= 7.19.4)");
450 #endif
451
452 if (getenv("GIT_CURL_VERBOSE"))
453 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
454
455 curl_easy_setopt(result, CURLOPT_USERAGENT,
456 user_agent ? user_agent : git_user_agent());
457
458 if (curl_ftp_no_epsv)
459 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
460
461 #ifdef CURLOPT_USE_SSL
462 if (curl_ssl_try)
463 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
464 #endif
465
466 if (curl_http_proxy) {
467 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
468 #if LIBCURL_VERSION_NUM >= 0x071800
469 if (starts_with(curl_http_proxy, "socks5"))
470 curl_easy_setopt(result,
471 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
472 else if (starts_with(curl_http_proxy, "socks4a"))
473 curl_easy_setopt(result,
474 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
475 else if (starts_with(curl_http_proxy, "socks"))
476 curl_easy_setopt(result,
477 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
478 #endif
479 }
480 #if LIBCURL_VERSION_NUM >= 0x070a07
481 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
482 #endif
483
484 set_curl_keepalive(result);
485
486 return result;
487 }
488
489 static void set_from_env(const char **var, const char *envname)
490 {
491 const char *val = getenv(envname);
492 if (val)
493 *var = val;
494 }
495
496 void http_init(struct remote *remote, const char *url, int proactive_auth)
497 {
498 char *low_speed_limit;
499 char *low_speed_time;
500 char *normalized_url;
501 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
502
503 config.section = "http";
504 config.key = NULL;
505 config.collect_fn = http_options;
506 config.cascade_fn = git_default_config;
507 config.cb = NULL;
508
509 http_is_verbose = 0;
510 normalized_url = url_normalize(url, &config.url);
511
512 git_config(urlmatch_config_entry, &config);
513 free(normalized_url);
514
515 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
516 die("curl_global_init failed");
517
518 http_proactive_auth = proactive_auth;
519
520 if (remote && remote->http_proxy)
521 curl_http_proxy = xstrdup(remote->http_proxy);
522
523 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
524 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
525
526 #ifdef USE_CURL_MULTI
527 {
528 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
529 if (http_max_requests != NULL)
530 max_requests = atoi(http_max_requests);
531 }
532
533 curlm = curl_multi_init();
534 if (!curlm)
535 die("curl_multi_init failed");
536 #endif
537
538 if (getenv("GIT_SSL_NO_VERIFY"))
539 curl_ssl_verify = 0;
540
541 set_from_env(&ssl_cert, "GIT_SSL_CERT");
542 #if LIBCURL_VERSION_NUM >= 0x070903
543 set_from_env(&ssl_key, "GIT_SSL_KEY");
544 #endif
545 #if LIBCURL_VERSION_NUM >= 0x070908
546 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
547 #endif
548 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
549
550 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
551
552 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
553 if (low_speed_limit != NULL)
554 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
555 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
556 if (low_speed_time != NULL)
557 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
558
559 if (curl_ssl_verify == -1)
560 curl_ssl_verify = 1;
561
562 curl_session_count = 0;
563 #ifdef USE_CURL_MULTI
564 if (max_requests < 1)
565 max_requests = DEFAULT_MAX_REQUESTS;
566 #endif
567
568 if (getenv("GIT_CURL_FTP_NO_EPSV"))
569 curl_ftp_no_epsv = 1;
570
571 if (url) {
572 credential_from_url(&http_auth, url);
573 if (!ssl_cert_password_required &&
574 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
575 starts_with(url, "https://"))
576 ssl_cert_password_required = 1;
577 }
578
579 #ifndef NO_CURL_EASY_DUPHANDLE
580 curl_default = get_curl_handle();
581 #endif
582 }
583
584 void http_cleanup(void)
585 {
586 struct active_request_slot *slot = active_queue_head;
587
588 while (slot != NULL) {
589 struct active_request_slot *next = slot->next;
590 if (slot->curl != NULL) {
591 #ifdef USE_CURL_MULTI
592 curl_multi_remove_handle(curlm, slot->curl);
593 #endif
594 curl_easy_cleanup(slot->curl);
595 }
596 free(slot);
597 slot = next;
598 }
599 active_queue_head = NULL;
600
601 #ifndef NO_CURL_EASY_DUPHANDLE
602 curl_easy_cleanup(curl_default);
603 #endif
604
605 #ifdef USE_CURL_MULTI
606 curl_multi_cleanup(curlm);
607 #endif
608 curl_global_cleanup();
609
610 curl_slist_free_all(pragma_header);
611 pragma_header = NULL;
612
613 curl_slist_free_all(no_pragma_header);
614 no_pragma_header = NULL;
615
616 if (curl_http_proxy) {
617 free((void *)curl_http_proxy);
618 curl_http_proxy = NULL;
619 }
620
621 if (cert_auth.password != NULL) {
622 memset(cert_auth.password, 0, strlen(cert_auth.password));
623 free(cert_auth.password);
624 cert_auth.password = NULL;
625 }
626 ssl_cert_password_required = 0;
627
628 free(cached_accept_language);
629 cached_accept_language = NULL;
630 }
631
632 struct active_request_slot *get_active_slot(void)
633 {
634 struct active_request_slot *slot = active_queue_head;
635 struct active_request_slot *newslot;
636
637 #ifdef USE_CURL_MULTI
638 int num_transfers;
639
640 /* Wait for a slot to open up if the queue is full */
641 while (active_requests >= max_requests) {
642 curl_multi_perform(curlm, &num_transfers);
643 if (num_transfers < active_requests)
644 process_curl_messages();
645 }
646 #endif
647
648 while (slot != NULL && slot->in_use)
649 slot = slot->next;
650
651 if (slot == NULL) {
652 newslot = xmalloc(sizeof(*newslot));
653 newslot->curl = NULL;
654 newslot->in_use = 0;
655 newslot->next = NULL;
656
657 slot = active_queue_head;
658 if (slot == NULL) {
659 active_queue_head = newslot;
660 } else {
661 while (slot->next != NULL)
662 slot = slot->next;
663 slot->next = newslot;
664 }
665 slot = newslot;
666 }
667
668 if (slot->curl == NULL) {
669 #ifdef NO_CURL_EASY_DUPHANDLE
670 slot->curl = get_curl_handle();
671 #else
672 slot->curl = curl_easy_duphandle(curl_default);
673 #endif
674 curl_session_count++;
675 }
676
677 active_requests++;
678 slot->in_use = 1;
679 slot->results = NULL;
680 slot->finished = NULL;
681 slot->callback_data = NULL;
682 slot->callback_func = NULL;
683 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
684 if (curl_save_cookies)
685 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
686 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
687 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
688 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
689 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
690 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
691 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
692 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
693 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
694 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
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 sprintf(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 /* http_request() targets */
1188 #define HTTP_REQUEST_STRBUF 0
1189 #define HTTP_REQUEST_FILE 1
1190
1191 static int http_request(const char *url,
1192 void *result, int target,
1193 const struct http_get_options *options)
1194 {
1195 struct active_request_slot *slot;
1196 struct slot_results results;
1197 struct curl_slist *headers = NULL;
1198 struct strbuf buf = STRBUF_INIT;
1199 const char *accept_language;
1200 int ret;
1201
1202 slot = get_active_slot();
1203 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1204
1205 if (result == NULL) {
1206 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1207 } else {
1208 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1209 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1210
1211 if (target == HTTP_REQUEST_FILE) {
1212 long posn = ftell(result);
1213 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1214 fwrite);
1215 if (posn > 0) {
1216 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1217 headers = curl_slist_append(headers, buf.buf);
1218 strbuf_reset(&buf);
1219 }
1220 } else
1221 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1222 fwrite_buffer);
1223 }
1224
1225 accept_language = get_accept_language();
1226
1227 if (accept_language)
1228 headers = curl_slist_append(headers, accept_language);
1229
1230 strbuf_addstr(&buf, "Pragma:");
1231 if (options && options->no_cache)
1232 strbuf_addstr(&buf, " no-cache");
1233 if (options && options->keep_error)
1234 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1235
1236 headers = curl_slist_append(headers, buf.buf);
1237
1238 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1239 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1240 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1241
1242 ret = run_one_slot(slot, &results);
1243
1244 if (options && options->content_type) {
1245 struct strbuf raw = STRBUF_INIT;
1246 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1247 extract_content_type(&raw, options->content_type,
1248 options->charset);
1249 strbuf_release(&raw);
1250 }
1251
1252 if (options && options->effective_url)
1253 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1254 options->effective_url);
1255
1256 curl_slist_free_all(headers);
1257 strbuf_release(&buf);
1258
1259 return ret;
1260 }
1261
1262 /*
1263 * Update the "base" url to a more appropriate value, as deduced by
1264 * redirects seen when requesting a URL starting with "url".
1265 *
1266 * The "asked" parameter is a URL that we asked curl to access, and must begin
1267 * with "base".
1268 *
1269 * The "got" parameter is the URL that curl reported to us as where we ended
1270 * up.
1271 *
1272 * Returns 1 if we updated the base url, 0 otherwise.
1273 *
1274 * Our basic strategy is to compare "base" and "asked" to find the bits
1275 * specific to our request. We then strip those bits off of "got" to yield the
1276 * new base. So for example, if our base is "http://example.com/foo.git",
1277 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1278 * with "https://other.example.com/foo.git/info/refs". We would want the
1279 * new URL to become "https://other.example.com/foo.git".
1280 *
1281 * Note that this assumes a sane redirect scheme. It's entirely possible
1282 * in the example above to end up at a URL that does not even end in
1283 * "info/refs". In such a case we simply punt, as there is not much we can
1284 * do (and such a scheme is unlikely to represent a real git repository,
1285 * which means we are likely about to abort anyway).
1286 */
1287 static int update_url_from_redirect(struct strbuf *base,
1288 const char *asked,
1289 const struct strbuf *got)
1290 {
1291 const char *tail;
1292 size_t tail_len;
1293
1294 if (!strcmp(asked, got->buf))
1295 return 0;
1296
1297 if (!skip_prefix(asked, base->buf, &tail))
1298 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1299 asked, base->buf);
1300
1301 tail_len = strlen(tail);
1302
1303 if (got->len < tail_len ||
1304 strcmp(tail, got->buf + got->len - tail_len))
1305 return 0; /* insane redirect scheme */
1306
1307 strbuf_reset(base);
1308 strbuf_add(base, got->buf, got->len - tail_len);
1309 return 1;
1310 }
1311
1312 static int http_request_reauth(const char *url,
1313 void *result, int target,
1314 struct http_get_options *options)
1315 {
1316 int ret = http_request(url, result, target, options);
1317
1318 if (options && options->effective_url && options->base_url) {
1319 if (update_url_from_redirect(options->base_url,
1320 url, options->effective_url)) {
1321 credential_from_url(&http_auth, options->base_url->buf);
1322 url = options->effective_url->buf;
1323 }
1324 }
1325
1326 if (ret != HTTP_REAUTH)
1327 return ret;
1328
1329 /*
1330 * If we are using KEEP_ERROR, the previous request may have
1331 * put cruft into our output stream; we should clear it out before
1332 * making our next request. We only know how to do this for
1333 * the strbuf case, but that is enough to satisfy current callers.
1334 */
1335 if (options && options->keep_error) {
1336 switch (target) {
1337 case HTTP_REQUEST_STRBUF:
1338 strbuf_reset(result);
1339 break;
1340 default:
1341 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1342 }
1343 }
1344
1345 credential_fill(&http_auth);
1346
1347 return http_request(url, result, target, options);
1348 }
1349
1350 int http_get_strbuf(const char *url,
1351 struct strbuf *result,
1352 struct http_get_options *options)
1353 {
1354 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1355 }
1356
1357 /*
1358 * Downloads a URL and stores the result in the given file.
1359 *
1360 * If a previous interrupted download is detected (i.e. a previous temporary
1361 * file is still around) the download is resumed.
1362 */
1363 static int http_get_file(const char *url, const char *filename,
1364 struct http_get_options *options)
1365 {
1366 int ret;
1367 struct strbuf tmpfile = STRBUF_INIT;
1368 FILE *result;
1369
1370 strbuf_addf(&tmpfile, "%s.temp", filename);
1371 result = fopen(tmpfile.buf, "a");
1372 if (!result) {
1373 error("Unable to open local file %s", tmpfile.buf);
1374 ret = HTTP_ERROR;
1375 goto cleanup;
1376 }
1377
1378 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1379 fclose(result);
1380
1381 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1382 ret = HTTP_ERROR;
1383 cleanup:
1384 strbuf_release(&tmpfile);
1385 return ret;
1386 }
1387
1388 int http_fetch_ref(const char *base, struct ref *ref)
1389 {
1390 struct http_get_options options = {0};
1391 char *url;
1392 struct strbuf buffer = STRBUF_INIT;
1393 int ret = -1;
1394
1395 options.no_cache = 1;
1396
1397 url = quote_ref_url(base, ref->name);
1398 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1399 strbuf_rtrim(&buffer);
1400 if (buffer.len == 40)
1401 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1402 else if (starts_with(buffer.buf, "ref: ")) {
1403 ref->symref = xstrdup(buffer.buf + 5);
1404 ret = 0;
1405 }
1406 }
1407
1408 strbuf_release(&buffer);
1409 free(url);
1410 return ret;
1411 }
1412
1413 /* Helpers for fetching packs */
1414 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1415 {
1416 char *url, *tmp;
1417 struct strbuf buf = STRBUF_INIT;
1418
1419 if (http_is_verbose)
1420 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1421
1422 end_url_with_slash(&buf, base_url);
1423 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1424 url = strbuf_detach(&buf, NULL);
1425
1426 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1427 tmp = strbuf_detach(&buf, NULL);
1428
1429 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1430 error("Unable to get pack index %s", url);
1431 free(tmp);
1432 tmp = NULL;
1433 }
1434
1435 free(url);
1436 return tmp;
1437 }
1438
1439 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1440 unsigned char *sha1, const char *base_url)
1441 {
1442 struct packed_git *new_pack;
1443 char *tmp_idx = NULL;
1444 int ret;
1445
1446 if (has_pack_index(sha1)) {
1447 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1448 if (!new_pack)
1449 return -1; /* parse_pack_index() already issued error message */
1450 goto add_pack;
1451 }
1452
1453 tmp_idx = fetch_pack_index(sha1, base_url);
1454 if (!tmp_idx)
1455 return -1;
1456
1457 new_pack = parse_pack_index(sha1, tmp_idx);
1458 if (!new_pack) {
1459 unlink(tmp_idx);
1460 free(tmp_idx);
1461
1462 return -1; /* parse_pack_index() already issued error message */
1463 }
1464
1465 ret = verify_pack_index(new_pack);
1466 if (!ret) {
1467 close_pack_index(new_pack);
1468 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1469 }
1470 free(tmp_idx);
1471 if (ret)
1472 return -1;
1473
1474 add_pack:
1475 new_pack->next = *packs_head;
1476 *packs_head = new_pack;
1477 return 0;
1478 }
1479
1480 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1481 {
1482 struct http_get_options options = {0};
1483 int ret = 0, i = 0;
1484 char *url, *data;
1485 struct strbuf buf = STRBUF_INIT;
1486 unsigned char sha1[20];
1487
1488 end_url_with_slash(&buf, base_url);
1489 strbuf_addstr(&buf, "objects/info/packs");
1490 url = strbuf_detach(&buf, NULL);
1491
1492 options.no_cache = 1;
1493 ret = http_get_strbuf(url, &buf, &options);
1494 if (ret != HTTP_OK)
1495 goto cleanup;
1496
1497 data = buf.buf;
1498 while (i < buf.len) {
1499 switch (data[i]) {
1500 case 'P':
1501 i++;
1502 if (i + 52 <= buf.len &&
1503 starts_with(data + i, " pack-") &&
1504 starts_with(data + i + 46, ".pack\n")) {
1505 get_sha1_hex(data + i + 6, sha1);
1506 fetch_and_setup_pack_index(packs_head, sha1,
1507 base_url);
1508 i += 51;
1509 break;
1510 }
1511 default:
1512 while (i < buf.len && data[i] != '\n')
1513 i++;
1514 }
1515 i++;
1516 }
1517
1518 cleanup:
1519 free(url);
1520 return ret;
1521 }
1522
1523 void release_http_pack_request(struct http_pack_request *preq)
1524 {
1525 if (preq->packfile != NULL) {
1526 fclose(preq->packfile);
1527 preq->packfile = NULL;
1528 }
1529 if (preq->range_header != NULL) {
1530 curl_slist_free_all(preq->range_header);
1531 preq->range_header = 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 struct child_process ip = CHILD_PROCESS_INIT;
1544 const char *ip_argv[8];
1545
1546 close_pack_index(p);
1547
1548 fclose(preq->packfile);
1549 preq->packfile = NULL;
1550
1551 lst = preq->lst;
1552 while (*lst != p)
1553 lst = &((*lst)->next);
1554 *lst = (*lst)->next;
1555
1556 tmp_idx = xstrdup(preq->tmpfile);
1557 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1558 ".idx.temp");
1559
1560 ip_argv[0] = "index-pack";
1561 ip_argv[1] = "-o";
1562 ip_argv[2] = tmp_idx;
1563 ip_argv[3] = preq->tmpfile;
1564 ip_argv[4] = NULL;
1565
1566 ip.argv = ip_argv;
1567 ip.git_cmd = 1;
1568 ip.no_stdin = 1;
1569 ip.no_stdout = 1;
1570
1571 if (run_command(&ip)) {
1572 unlink(preq->tmpfile);
1573 unlink(tmp_idx);
1574 free(tmp_idx);
1575 return -1;
1576 }
1577
1578 unlink(sha1_pack_index_name(p->sha1));
1579
1580 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1581 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1582 free(tmp_idx);
1583 return -1;
1584 }
1585
1586 install_packed_git(p);
1587 free(tmp_idx);
1588 return 0;
1589 }
1590
1591 struct http_pack_request *new_http_pack_request(
1592 struct packed_git *target, const char *base_url)
1593 {
1594 long prev_posn = 0;
1595 char range[RANGE_HEADER_SIZE];
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 = ftell(preq->packfile);
1628 if (prev_posn>0) {
1629 if (http_is_verbose)
1630 fprintf(stderr,
1631 "Resuming fetch of pack %s at byte %ld\n",
1632 sha1_to_hex(target->sha1), prev_posn);
1633 sprintf(range, "Range: bytes=%ld-", prev_posn);
1634 preq->range_header = curl_slist_append(NULL, range);
1635 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1636 preq->range_header);
1637 }
1638
1639 return preq;
1640
1641 abort:
1642 free(preq->url);
1643 free(preq);
1644 return NULL;
1645 }
1646
1647 /* Helpers for fetching objects (loose) */
1648 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1649 void *data)
1650 {
1651 unsigned char expn[4096];
1652 size_t size = eltsize * nmemb;
1653 int posn = 0;
1654 struct http_object_request *freq =
1655 (struct http_object_request *)data;
1656 do {
1657 ssize_t retval = xwrite(freq->localfile,
1658 (char *) ptr + posn, size - posn);
1659 if (retval < 0)
1660 return posn;
1661 posn += retval;
1662 } while (posn < size);
1663
1664 freq->stream.avail_in = size;
1665 freq->stream.next_in = (void *)ptr;
1666 do {
1667 freq->stream.next_out = expn;
1668 freq->stream.avail_out = sizeof(expn);
1669 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1670 git_SHA1_Update(&freq->c, expn,
1671 sizeof(expn) - freq->stream.avail_out);
1672 } while (freq->stream.avail_in && freq->zret == Z_OK);
1673 return size;
1674 }
1675
1676 struct http_object_request *new_http_object_request(const char *base_url,
1677 unsigned char *sha1)
1678 {
1679 char *hex = sha1_to_hex(sha1);
1680 const char *filename;
1681 char prevfile[PATH_MAX];
1682 int prevlocal;
1683 char prev_buf[PREV_BUF_SIZE];
1684 ssize_t prev_read = 0;
1685 long prev_posn = 0;
1686 char range[RANGE_HEADER_SIZE];
1687 struct curl_slist *range_header = NULL;
1688 struct http_object_request *freq;
1689
1690 freq = xcalloc(1, sizeof(*freq));
1691 hashcpy(freq->sha1, sha1);
1692 freq->localfile = -1;
1693
1694 filename = sha1_file_name(sha1);
1695 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1696 "%s.temp", filename);
1697
1698 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1699 unlink_or_warn(prevfile);
1700 rename(freq->tmpfile, prevfile);
1701 unlink_or_warn(freq->tmpfile);
1702
1703 if (freq->localfile != -1)
1704 error("fd leakage in start: %d", freq->localfile);
1705 freq->localfile = open(freq->tmpfile,
1706 O_WRONLY | O_CREAT | O_EXCL, 0666);
1707 /*
1708 * This could have failed due to the "lazy directory creation";
1709 * try to mkdir the last path component.
1710 */
1711 if (freq->localfile < 0 && errno == ENOENT) {
1712 char *dir = strrchr(freq->tmpfile, '/');
1713 if (dir) {
1714 *dir = 0;
1715 mkdir(freq->tmpfile, 0777);
1716 *dir = '/';
1717 }
1718 freq->localfile = open(freq->tmpfile,
1719 O_WRONLY | O_CREAT | O_EXCL, 0666);
1720 }
1721
1722 if (freq->localfile < 0) {
1723 error("Couldn't create temporary file %s: %s",
1724 freq->tmpfile, strerror(errno));
1725 goto abort;
1726 }
1727
1728 git_inflate_init(&freq->stream);
1729
1730 git_SHA1_Init(&freq->c);
1731
1732 freq->url = get_remote_object_url(base_url, hex, 0);
1733
1734 /*
1735 * If a previous temp file is present, process what was already
1736 * fetched.
1737 */
1738 prevlocal = open(prevfile, O_RDONLY);
1739 if (prevlocal != -1) {
1740 do {
1741 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1742 if (prev_read>0) {
1743 if (fwrite_sha1_file(prev_buf,
1744 1,
1745 prev_read,
1746 freq) == prev_read) {
1747 prev_posn += prev_read;
1748 } else {
1749 prev_read = -1;
1750 }
1751 }
1752 } while (prev_read > 0);
1753 close(prevlocal);
1754 }
1755 unlink_or_warn(prevfile);
1756
1757 /*
1758 * Reset inflate/SHA1 if there was an error reading the previous temp
1759 * file; also rewind to the beginning of the local file.
1760 */
1761 if (prev_read == -1) {
1762 memset(&freq->stream, 0, sizeof(freq->stream));
1763 git_inflate_init(&freq->stream);
1764 git_SHA1_Init(&freq->c);
1765 if (prev_posn>0) {
1766 prev_posn = 0;
1767 lseek(freq->localfile, 0, SEEK_SET);
1768 if (ftruncate(freq->localfile, 0) < 0) {
1769 error("Couldn't truncate temporary file %s: %s",
1770 freq->tmpfile, strerror(errno));
1771 goto abort;
1772 }
1773 }
1774 }
1775
1776 freq->slot = get_active_slot();
1777
1778 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1779 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1780 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1781 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1782 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1783
1784 /*
1785 * If we have successfully processed data from a previous fetch
1786 * attempt, only fetch the data we don't already have.
1787 */
1788 if (prev_posn>0) {
1789 if (http_is_verbose)
1790 fprintf(stderr,
1791 "Resuming fetch of object %s at byte %ld\n",
1792 hex, prev_posn);
1793 sprintf(range, "Range: bytes=%ld-", prev_posn);
1794 range_header = curl_slist_append(range_header, range);
1795 curl_easy_setopt(freq->slot->curl,
1796 CURLOPT_HTTPHEADER, range_header);
1797 }
1798
1799 return freq;
1800
1801 abort:
1802 free(freq->url);
1803 free(freq);
1804 return NULL;
1805 }
1806
1807 void process_http_object_request(struct http_object_request *freq)
1808 {
1809 if (freq->slot == NULL)
1810 return;
1811 freq->curl_result = freq->slot->curl_result;
1812 freq->http_code = freq->slot->http_code;
1813 freq->slot = NULL;
1814 }
1815
1816 int finish_http_object_request(struct http_object_request *freq)
1817 {
1818 struct stat st;
1819
1820 close(freq->localfile);
1821 freq->localfile = -1;
1822
1823 process_http_object_request(freq);
1824
1825 if (freq->http_code == 416) {
1826 warning("requested range invalid; we may already have all the data.");
1827 } else if (freq->curl_result != CURLE_OK) {
1828 if (stat(freq->tmpfile, &st) == 0)
1829 if (st.st_size == 0)
1830 unlink_or_warn(freq->tmpfile);
1831 return -1;
1832 }
1833
1834 git_inflate_end(&freq->stream);
1835 git_SHA1_Final(freq->real_sha1, &freq->c);
1836 if (freq->zret != Z_STREAM_END) {
1837 unlink_or_warn(freq->tmpfile);
1838 return -1;
1839 }
1840 if (hashcmp(freq->sha1, freq->real_sha1)) {
1841 unlink_or_warn(freq->tmpfile);
1842 return -1;
1843 }
1844 freq->rename =
1845 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
1846
1847 return freq->rename;
1848 }
1849
1850 void abort_http_object_request(struct http_object_request *freq)
1851 {
1852 unlink_or_warn(freq->tmpfile);
1853
1854 release_http_object_request(freq);
1855 }
1856
1857 void release_http_object_request(struct http_object_request *freq)
1858 {
1859 if (freq->localfile != -1) {
1860 close(freq->localfile);
1861 freq->localfile = -1;
1862 }
1863 if (freq->url != NULL) {
1864 free(freq->url);
1865 freq->url = NULL;
1866 }
1867 if (freq->slot != NULL) {
1868 freq->slot->callback_func = NULL;
1869 freq->slot->callback_data = NULL;
1870 release_active_slot(freq->slot);
1871 freq->slot = NULL;
1872 }
1873 }
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