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add_sought_entry_mem: convert to struct object_id
[git/gitweb.git] / http.c
blobf5f2e783c0a0233667b7b3b0efc9561fe17b03cc
1 #include "git-compat-util.h"
2 #include "http.h"
3 #include "pack.h"
4 #include "sideband.h"
5 #include "run-command.h"
6 #include "url.h"
7 #include "urlmatch.h"
8 #include "credential.h"
9 #include "version.h"
10 #include "pkt-line.h"
11 #include "gettext.h"
12 #include "transport.h"
13
14 int active_requests;
15 int http_is_verbose;
16 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
17
18 #if LIBCURL_VERSION_NUM >= 0x070a06
19 #define LIBCURL_CAN_HANDLE_AUTH_ANY
20 #endif
21
22 static int min_curl_sessions = 1;
23 static int curl_session_count;
24 #ifdef USE_CURL_MULTI
25 static int max_requests = -1;
26 static CURLM *curlm;
27 #endif
28 #ifndef NO_CURL_EASY_DUPHANDLE
29 static CURL *curl_default;
30 #endif
31
32 #define PREV_BUF_SIZE 4096
33
34 char curl_errorstr[CURL_ERROR_SIZE];
35
36 static int curl_ssl_verify = -1;
37 static int curl_ssl_try;
38 static const char *ssl_cert;
39 static const char *ssl_cipherlist;
40 static const char *ssl_version;
41 static struct {
42 const char *name;
43 long ssl_version;
44 } sslversions[] = {
45 { "sslv2", CURL_SSLVERSION_SSLv2 },
46 { "sslv3", CURL_SSLVERSION_SSLv3 },
47 { "tlsv1", CURL_SSLVERSION_TLSv1 },
48 #if LIBCURL_VERSION_NUM >= 0x072200
49 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
50 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
51 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
52 #endif
53 };
54 #if LIBCURL_VERSION_NUM >= 0x070903
55 static const char *ssl_key;
56 #endif
57 #if LIBCURL_VERSION_NUM >= 0x070908
58 static const char *ssl_capath;
59 #endif
60 static const char *ssl_cainfo;
61 static long curl_low_speed_limit = -1;
62 static long curl_low_speed_time = -1;
63 static int curl_ftp_no_epsv;
64 static const char *curl_http_proxy;
65 static const char *curl_cookie_file;
66 static int curl_save_cookies;
67 struct credential http_auth = CREDENTIAL_INIT;
68 static int http_proactive_auth;
69 static const char *user_agent;
70
71 #if LIBCURL_VERSION_NUM >= 0x071700
72 /* Use CURLOPT_KEYPASSWD as is */
73 #elif LIBCURL_VERSION_NUM >= 0x070903
74 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
75 #else
76 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
77 #endif
78
79 static struct credential cert_auth = CREDENTIAL_INIT;
80 static int ssl_cert_password_required;
81 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
82 static unsigned long http_auth_methods = CURLAUTH_ANY;
83 #endif
84
85 static struct curl_slist *pragma_header;
86 static struct curl_slist *no_pragma_header;
87
88 static struct active_request_slot *active_queue_head;
89
90 static char *cached_accept_language;
91
92 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
93 {
94 size_t size = eltsize * nmemb;
95 struct buffer *buffer = buffer_;
96
97 if (size > buffer->buf.len - buffer->posn)
98 size = buffer->buf.len - buffer->posn;
99 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
100 buffer->posn += size;
101
102 return size;
103 }
104
105 #ifndef NO_CURL_IOCTL
106 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
107 {
108 struct buffer *buffer = clientp;
109
110 switch (cmd) {
111 case CURLIOCMD_NOP:
112 return CURLIOE_OK;
113
114 case CURLIOCMD_RESTARTREAD:
115 buffer->posn = 0;
116 return CURLIOE_OK;
117
118 default:
119 return CURLIOE_UNKNOWNCMD;
120 }
121 }
122 #endif
123
124 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
125 {
126 size_t size = eltsize * nmemb;
127 struct strbuf *buffer = buffer_;
128
129 strbuf_add(buffer, ptr, size);
130 return size;
131 }
132
133 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
134 {
135 return eltsize * nmemb;
136 }
137
138 static void closedown_active_slot(struct active_request_slot *slot)
139 {
140 active_requests--;
141 slot->in_use = 0;
142 }
143
144 static void finish_active_slot(struct active_request_slot *slot)
145 {
146 closedown_active_slot(slot);
147 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
148
149 if (slot->finished != NULL)
150 (*slot->finished) = 1;
151
152 /* Store slot results so they can be read after the slot is reused */
153 if (slot->results != NULL) {
154 slot->results->curl_result = slot->curl_result;
155 slot->results->http_code = slot->http_code;
156 #if LIBCURL_VERSION_NUM >= 0x070a08
157 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
158 &slot->results->auth_avail);
159 #else
160 slot->results->auth_avail = 0;
161 #endif
162 }
163
164 /* Run callback if appropriate */
165 if (slot->callback_func != NULL)
166 slot->callback_func(slot->callback_data);
167 }
168
169 #ifdef USE_CURL_MULTI
170 static void process_curl_messages(void)
171 {
172 int num_messages;
173 struct active_request_slot *slot;
174 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
175
176 while (curl_message != NULL) {
177 if (curl_message->msg == CURLMSG_DONE) {
178 int curl_result = curl_message->data.result;
179 slot = active_queue_head;
180 while (slot != NULL &&
181 slot->curl != curl_message->easy_handle)
182 slot = slot->next;
183 if (slot != NULL) {
184 curl_multi_remove_handle(curlm, slot->curl);
185 slot->curl_result = curl_result;
186 finish_active_slot(slot);
187 } else {
188 fprintf(stderr, "Received DONE message for unknown request!\n");
189 }
190 } else {
191 fprintf(stderr, "Unknown CURL message received: %d\n",
192 (int)curl_message->msg);
193 }
194 curl_message = curl_multi_info_read(curlm, &num_messages);
195 }
196 }
197 #endif
198
199 static int http_options(const char *var, const char *value, void *cb)
200 {
201 if (!strcmp("http.sslverify", var)) {
202 curl_ssl_verify = git_config_bool(var, value);
203 return 0;
204 }
205 if (!strcmp("http.sslcipherlist", var))
206 return git_config_string(&ssl_cipherlist, var, value);
207 if (!strcmp("http.sslversion", var))
208 return git_config_string(&ssl_version, var, value);
209 if (!strcmp("http.sslcert", var))
210 return git_config_string(&ssl_cert, var, value);
211 #if LIBCURL_VERSION_NUM >= 0x070903
212 if (!strcmp("http.sslkey", var))
213 return git_config_string(&ssl_key, var, value);
214 #endif
215 #if LIBCURL_VERSION_NUM >= 0x070908
216 if (!strcmp("http.sslcapath", var))
217 return git_config_string(&ssl_capath, var, value);
218 #endif
219 if (!strcmp("http.sslcainfo", var))
220 return git_config_string(&ssl_cainfo, var, value);
221 if (!strcmp("http.sslcertpasswordprotected", var)) {
222 ssl_cert_password_required = git_config_bool(var, value);
223 return 0;
224 }
225 if (!strcmp("http.ssltry", var)) {
226 curl_ssl_try = git_config_bool(var, value);
227 return 0;
228 }
229 if (!strcmp("http.minsessions", var)) {
230 min_curl_sessions = git_config_int(var, value);
231 #ifndef USE_CURL_MULTI
232 if (min_curl_sessions > 1)
233 min_curl_sessions = 1;
234 #endif
235 return 0;
236 }
237 #ifdef USE_CURL_MULTI
238 if (!strcmp("http.maxrequests", var)) {
239 max_requests = git_config_int(var, value);
240 return 0;
241 }
242 #endif
243 if (!strcmp("http.lowspeedlimit", var)) {
244 curl_low_speed_limit = (long)git_config_int(var, value);
245 return 0;
246 }
247 if (!strcmp("http.lowspeedtime", var)) {
248 curl_low_speed_time = (long)git_config_int(var, value);
249 return 0;
250 }
251
252 if (!strcmp("http.noepsv", var)) {
253 curl_ftp_no_epsv = git_config_bool(var, value);
254 return 0;
255 }
256 if (!strcmp("http.proxy", var))
257 return git_config_string(&curl_http_proxy, var, value);
258
259 if (!strcmp("http.cookiefile", var))
260 return git_config_string(&curl_cookie_file, var, value);
261 if (!strcmp("http.savecookies", var)) {
262 curl_save_cookies = git_config_bool(var, value);
263 return 0;
264 }
265
266 if (!strcmp("http.postbuffer", var)) {
267 http_post_buffer = git_config_int(var, value);
268 if (http_post_buffer < LARGE_PACKET_MAX)
269 http_post_buffer = LARGE_PACKET_MAX;
270 return 0;
271 }
272
273 if (!strcmp("http.useragent", var))
274 return git_config_string(&user_agent, var, value);
275
276 /* Fall back on the default ones */
277 return git_default_config(var, value, cb);
278 }
279
280 static void init_curl_http_auth(CURL *result)
281 {
282 if (!http_auth.username)
283 return;
284
285 credential_fill(&http_auth);
286
287 #if LIBCURL_VERSION_NUM >= 0x071301
288 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
289 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
290 #else
291 {
292 static struct strbuf up = STRBUF_INIT;
293 /*
294 * Note that we assume we only ever have a single set of
295 * credentials in a given program run, so we do not have
296 * to worry about updating this buffer, only setting its
297 * initial value.
298 */
299 if (!up.len)
300 strbuf_addf(&up, "%s:%s",
301 http_auth.username, http_auth.password);
302 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
303 }
304 #endif
305 }
306
307 static int has_cert_password(void)
308 {
309 if (ssl_cert == NULL || ssl_cert_password_required != 1)
310 return 0;
311 if (!cert_auth.password) {
312 cert_auth.protocol = xstrdup("cert");
313 cert_auth.username = xstrdup("");
314 cert_auth.path = xstrdup(ssl_cert);
315 credential_fill(&cert_auth);
316 }
317 return 1;
318 }
319
320 #if LIBCURL_VERSION_NUM >= 0x071900
321 static void set_curl_keepalive(CURL *c)
322 {
323 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
324 }
325
326 #elif LIBCURL_VERSION_NUM >= 0x071000
327 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
328 {
329 int ka = 1;
330 int rc;
331 socklen_t len = (socklen_t)sizeof(ka);
332
333 if (type != CURLSOCKTYPE_IPCXN)
334 return 0;
335
336 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
337 if (rc < 0)
338 warning("unable to set SO_KEEPALIVE on socket %s",
339 strerror(errno));
340
341 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
342 }
343
344 static void set_curl_keepalive(CURL *c)
345 {
346 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
347 }
348
349 #else
350 static void set_curl_keepalive(CURL *c)
351 {
352 /* not supported on older curl versions */
353 }
354 #endif
355
356 static CURL *get_curl_handle(void)
357 {
358 CURL *result = curl_easy_init();
359 long allowed_protocols = 0;
360
361 if (!result)
362 die("curl_easy_init failed");
363
364 if (!curl_ssl_verify) {
365 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
366 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
367 } else {
368 /* Verify authenticity of the peer's certificate */
369 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
370 /* The name in the cert must match whom we tried to connect */
371 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
372 }
373
374 #if LIBCURL_VERSION_NUM >= 0x070907
375 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
376 #endif
377 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
378 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
379 #endif
380
381 if (http_proactive_auth)
382 init_curl_http_auth(result);
383
384 if (getenv("GIT_SSL_VERSION"))
385 ssl_version = getenv("GIT_SSL_VERSION");
386 if (ssl_version && *ssl_version) {
387 int i;
388 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
389 if (!strcmp(ssl_version, sslversions[i].name)) {
390 curl_easy_setopt(result, CURLOPT_SSLVERSION,
391 sslversions[i].ssl_version);
392 break;
393 }
394 }
395 if (i == ARRAY_SIZE(sslversions))
396 warning("unsupported ssl version %s: using default",
397 ssl_version);
398 }
399
400 if (getenv("GIT_SSL_CIPHER_LIST"))
401 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
402 if (ssl_cipherlist != NULL && *ssl_cipherlist)
403 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
404 ssl_cipherlist);
405
406 if (ssl_cert != NULL)
407 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
408 if (has_cert_password())
409 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
410 #if LIBCURL_VERSION_NUM >= 0x070903
411 if (ssl_key != NULL)
412 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
413 #endif
414 #if LIBCURL_VERSION_NUM >= 0x070908
415 if (ssl_capath != NULL)
416 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
417 #endif
418 if (ssl_cainfo != NULL)
419 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
420
421 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
422 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
423 curl_low_speed_limit);
424 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
425 curl_low_speed_time);
426 }
427
428 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
429 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
430 #if LIBCURL_VERSION_NUM >= 0x071301
431 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
432 #elif LIBCURL_VERSION_NUM >= 0x071101
433 curl_easy_setopt(result, CURLOPT_POST301, 1);
434 #endif
435 #if LIBCURL_VERSION_NUM >= 0x071304
436 if (is_transport_allowed("http"))
437 allowed_protocols |= CURLPROTO_HTTP;
438 if (is_transport_allowed("https"))
439 allowed_protocols |= CURLPROTO_HTTPS;
440 if (is_transport_allowed("ftp"))
441 allowed_protocols |= CURLPROTO_FTP;
442 if (is_transport_allowed("ftps"))
443 allowed_protocols |= CURLPROTO_FTPS;
444 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
445 #else
446 if (transport_restrict_protocols())
447 warning("protocol restrictions not applied to curl redirects because\n"
448 "your curl version is too old (>= 7.19.4)");
449 #endif
450
451 if (getenv("GIT_CURL_VERBOSE"))
452 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
453
454 curl_easy_setopt(result, CURLOPT_USERAGENT,
455 user_agent ? user_agent : git_user_agent());
456
457 if (curl_ftp_no_epsv)
458 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
459
460 #ifdef CURLOPT_USE_SSL
461 if (curl_ssl_try)
462 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
463 #endif
464
465 if (curl_http_proxy) {
466 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
467 }
468 #if LIBCURL_VERSION_NUM >= 0x070a07
469 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
470 #endif
471
472 set_curl_keepalive(result);
473
474 return result;
475 }
476
477 static void set_from_env(const char **var, const char *envname)
478 {
479 const char *val = getenv(envname);
480 if (val)
481 *var = val;
482 }
483
484 void http_init(struct remote *remote, const char *url, int proactive_auth)
485 {
486 char *low_speed_limit;
487 char *low_speed_time;
488 char *normalized_url;
489 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
490
491 config.section = "http";
492 config.key = NULL;
493 config.collect_fn = http_options;
494 config.cascade_fn = git_default_config;
495 config.cb = NULL;
496
497 http_is_verbose = 0;
498 normalized_url = url_normalize(url, &config.url);
499
500 git_config(urlmatch_config_entry, &config);
501 free(normalized_url);
502
503 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
504 die("curl_global_init failed");
505
506 http_proactive_auth = proactive_auth;
507
508 if (remote && remote->http_proxy)
509 curl_http_proxy = xstrdup(remote->http_proxy);
510
511 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
512 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
513
514 #ifdef USE_CURL_MULTI
515 {
516 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
517 if (http_max_requests != NULL)
518 max_requests = atoi(http_max_requests);
519 }
520
521 curlm = curl_multi_init();
522 if (!curlm)
523 die("curl_multi_init failed");
524 #endif
525
526 if (getenv("GIT_SSL_NO_VERIFY"))
527 curl_ssl_verify = 0;
528
529 set_from_env(&ssl_cert, "GIT_SSL_CERT");
530 #if LIBCURL_VERSION_NUM >= 0x070903
531 set_from_env(&ssl_key, "GIT_SSL_KEY");
532 #endif
533 #if LIBCURL_VERSION_NUM >= 0x070908
534 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
535 #endif
536 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
537
538 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
539
540 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
541 if (low_speed_limit != NULL)
542 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
543 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
544 if (low_speed_time != NULL)
545 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
546
547 if (curl_ssl_verify == -1)
548 curl_ssl_verify = 1;
549
550 curl_session_count = 0;
551 #ifdef USE_CURL_MULTI
552 if (max_requests < 1)
553 max_requests = DEFAULT_MAX_REQUESTS;
554 #endif
555
556 if (getenv("GIT_CURL_FTP_NO_EPSV"))
557 curl_ftp_no_epsv = 1;
558
559 if (url) {
560 credential_from_url(&http_auth, url);
561 if (!ssl_cert_password_required &&
562 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
563 starts_with(url, "https://"))
564 ssl_cert_password_required = 1;
565 }
566
567 #ifndef NO_CURL_EASY_DUPHANDLE
568 curl_default = get_curl_handle();
569 #endif
570 }
571
572 void http_cleanup(void)
573 {
574 struct active_request_slot *slot = active_queue_head;
575
576 while (slot != NULL) {
577 struct active_request_slot *next = slot->next;
578 if (slot->curl != NULL) {
579 #ifdef USE_CURL_MULTI
580 curl_multi_remove_handle(curlm, slot->curl);
581 #endif
582 curl_easy_cleanup(slot->curl);
583 }
584 free(slot);
585 slot = next;
586 }
587 active_queue_head = NULL;
588
589 #ifndef NO_CURL_EASY_DUPHANDLE
590 curl_easy_cleanup(curl_default);
591 #endif
592
593 #ifdef USE_CURL_MULTI
594 curl_multi_cleanup(curlm);
595 #endif
596 curl_global_cleanup();
597
598 curl_slist_free_all(pragma_header);
599 pragma_header = NULL;
600
601 curl_slist_free_all(no_pragma_header);
602 no_pragma_header = NULL;
603
604 if (curl_http_proxy) {
605 free((void *)curl_http_proxy);
606 curl_http_proxy = NULL;
607 }
608
609 if (cert_auth.password != NULL) {
610 memset(cert_auth.password, 0, strlen(cert_auth.password));
611 free(cert_auth.password);
612 cert_auth.password = NULL;
613 }
614 ssl_cert_password_required = 0;
615
616 free(cached_accept_language);
617 cached_accept_language = NULL;
618 }
619
620 struct active_request_slot *get_active_slot(void)
621 {
622 struct active_request_slot *slot = active_queue_head;
623 struct active_request_slot *newslot;
624
625 #ifdef USE_CURL_MULTI
626 int num_transfers;
627
628 /* Wait for a slot to open up if the queue is full */
629 while (active_requests >= max_requests) {
630 curl_multi_perform(curlm, &num_transfers);
631 if (num_transfers < active_requests)
632 process_curl_messages();
633 }
634 #endif
635
636 while (slot != NULL && slot->in_use)
637 slot = slot->next;
638
639 if (slot == NULL) {
640 newslot = xmalloc(sizeof(*newslot));
641 newslot->curl = NULL;
642 newslot->in_use = 0;
643 newslot->next = NULL;
644
645 slot = active_queue_head;
646 if (slot == NULL) {
647 active_queue_head = newslot;
648 } else {
649 while (slot->next != NULL)
650 slot = slot->next;
651 slot->next = newslot;
652 }
653 slot = newslot;
654 }
655
656 if (slot->curl == NULL) {
657 #ifdef NO_CURL_EASY_DUPHANDLE
658 slot->curl = get_curl_handle();
659 #else
660 slot->curl = curl_easy_duphandle(curl_default);
661 #endif
662 curl_session_count++;
663 }
664
665 active_requests++;
666 slot->in_use = 1;
667 slot->results = NULL;
668 slot->finished = NULL;
669 slot->callback_data = NULL;
670 slot->callback_func = NULL;
671 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
672 if (curl_save_cookies)
673 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
674 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
675 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
676 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
677 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
678 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
679 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
680 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
681 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
682 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
683 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
684 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
685 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
686 #endif
687 if (http_auth.password)
688 init_curl_http_auth(slot->curl);
689
690 return slot;
691 }
692
693 int start_active_slot(struct active_request_slot *slot)
694 {
695 #ifdef USE_CURL_MULTI
696 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
697 int num_transfers;
698
699 if (curlm_result != CURLM_OK &&
700 curlm_result != CURLM_CALL_MULTI_PERFORM) {
701 active_requests--;
702 slot->in_use = 0;
703 return 0;
704 }
705
706 /*
707 * We know there must be something to do, since we just added
708 * something.
709 */
710 curl_multi_perform(curlm, &num_transfers);
711 #endif
712 return 1;
713 }
714
715 #ifdef USE_CURL_MULTI
716 struct fill_chain {
717 void *data;
718 int (*fill)(void *);
719 struct fill_chain *next;
720 };
721
722 static struct fill_chain *fill_cfg;
723
724 void add_fill_function(void *data, int (*fill)(void *))
725 {
726 struct fill_chain *new = xmalloc(sizeof(*new));
727 struct fill_chain **linkp = &fill_cfg;
728 new->data = data;
729 new->fill = fill;
730 new->next = NULL;
731 while (*linkp)
732 linkp = &(*linkp)->next;
733 *linkp = new;
734 }
735
736 void fill_active_slots(void)
737 {
738 struct active_request_slot *slot = active_queue_head;
739
740 while (active_requests < max_requests) {
741 struct fill_chain *fill;
742 for (fill = fill_cfg; fill; fill = fill->next)
743 if (fill->fill(fill->data))
744 break;
745
746 if (!fill)
747 break;
748 }
749
750 while (slot != NULL) {
751 if (!slot->in_use && slot->curl != NULL
752 && curl_session_count > min_curl_sessions) {
753 curl_easy_cleanup(slot->curl);
754 slot->curl = NULL;
755 curl_session_count--;
756 }
757 slot = slot->next;
758 }
759 }
760
761 void step_active_slots(void)
762 {
763 int num_transfers;
764 CURLMcode curlm_result;
765
766 do {
767 curlm_result = curl_multi_perform(curlm, &num_transfers);
768 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
769 if (num_transfers < active_requests) {
770 process_curl_messages();
771 fill_active_slots();
772 }
773 }
774 #endif
775
776 void run_active_slot(struct active_request_slot *slot)
777 {
778 #ifdef USE_CURL_MULTI
779 fd_set readfds;
780 fd_set writefds;
781 fd_set excfds;
782 int max_fd;
783 struct timeval select_timeout;
784 int finished = 0;
785
786 slot->finished = &finished;
787 while (!finished) {
788 step_active_slots();
789
790 if (slot->in_use) {
791 #if LIBCURL_VERSION_NUM >= 0x070f04
792 long curl_timeout;
793 curl_multi_timeout(curlm, &curl_timeout);
794 if (curl_timeout == 0) {
795 continue;
796 } else if (curl_timeout == -1) {
797 select_timeout.tv_sec = 0;
798 select_timeout.tv_usec = 50000;
799 } else {
800 select_timeout.tv_sec = curl_timeout / 1000;
801 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
802 }
803 #else
804 select_timeout.tv_sec = 0;
805 select_timeout.tv_usec = 50000;
806 #endif
807
808 max_fd = -1;
809 FD_ZERO(&readfds);
810 FD_ZERO(&writefds);
811 FD_ZERO(&excfds);
812 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
813
814 /*
815 * It can happen that curl_multi_timeout returns a pathologically
816 * long timeout when curl_multi_fdset returns no file descriptors
817 * to read. See commit message for more details.
818 */
819 if (max_fd < 0 &&
820 (select_timeout.tv_sec > 0 ||
821 select_timeout.tv_usec > 50000)) {
822 select_timeout.tv_sec = 0;
823 select_timeout.tv_usec = 50000;
824 }
825
826 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
827 }
828 }
829 #else
830 while (slot->in_use) {
831 slot->curl_result = curl_easy_perform(slot->curl);
832 finish_active_slot(slot);
833 }
834 #endif
835 }
836
837 static void release_active_slot(struct active_request_slot *slot)
838 {
839 closedown_active_slot(slot);
840 if (slot->curl && curl_session_count > min_curl_sessions) {
841 #ifdef USE_CURL_MULTI
842 curl_multi_remove_handle(curlm, slot->curl);
843 #endif
844 curl_easy_cleanup(slot->curl);
845 slot->curl = NULL;
846 curl_session_count--;
847 }
848 #ifdef USE_CURL_MULTI
849 fill_active_slots();
850 #endif
851 }
852
853 void finish_all_active_slots(void)
854 {
855 struct active_request_slot *slot = active_queue_head;
856
857 while (slot != NULL)
858 if (slot->in_use) {
859 run_active_slot(slot);
860 slot = active_queue_head;
861 } else {
862 slot = slot->next;
863 }
864 }
865
866 /* Helpers for modifying and creating URLs */
867 static inline int needs_quote(int ch)
868 {
869 if (((ch >= 'A') && (ch <= 'Z'))
870 || ((ch >= 'a') && (ch <= 'z'))
871 || ((ch >= '0') && (ch <= '9'))
872 || (ch == '/')
873 || (ch == '-')
874 || (ch == '.'))
875 return 0;
876 return 1;
877 }
878
879 static char *quote_ref_url(const char *base, const char *ref)
880 {
881 struct strbuf buf = STRBUF_INIT;
882 const char *cp;
883 int ch;
884
885 end_url_with_slash(&buf, base);
886
887 for (cp = ref; (ch = *cp) != 0; cp++)
888 if (needs_quote(ch))
889 strbuf_addf(&buf, "%%%02x", ch);
890 else
891 strbuf_addch(&buf, *cp);
892
893 return strbuf_detach(&buf, NULL);
894 }
895
896 void append_remote_object_url(struct strbuf *buf, const char *url,
897 const char *hex,
898 int only_two_digit_prefix)
899 {
900 end_url_with_slash(buf, url);
901
902 strbuf_addf(buf, "objects/%.*s/", 2, hex);
903 if (!only_two_digit_prefix)
904 strbuf_addf(buf, "%s", hex+2);
905 }
906
907 char *get_remote_object_url(const char *url, const char *hex,
908 int only_two_digit_prefix)
909 {
910 struct strbuf buf = STRBUF_INIT;
911 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
912 return strbuf_detach(&buf, NULL);
913 }
914
915 static int handle_curl_result(struct slot_results *results)
916 {
917 /*
918 * If we see a failing http code with CURLE_OK, we have turned off
919 * FAILONERROR (to keep the server's custom error response), and should
920 * translate the code into failure here.
921 */
922 if (results->curl_result == CURLE_OK &&
923 results->http_code >= 400) {
924 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
925 /*
926 * Normally curl will already have put the "reason phrase"
927 * from the server into curl_errorstr; unfortunately without
928 * FAILONERROR it is lost, so we can give only the numeric
929 * status code.
930 */
931 snprintf(curl_errorstr, sizeof(curl_errorstr),
932 "The requested URL returned error: %ld",
933 results->http_code);
934 }
935
936 if (results->curl_result == CURLE_OK) {
937 credential_approve(&http_auth);
938 return HTTP_OK;
939 } else if (missing_target(results))
940 return HTTP_MISSING_TARGET;
941 else if (results->http_code == 401) {
942 if (http_auth.username && http_auth.password) {
943 credential_reject(&http_auth);
944 return HTTP_NOAUTH;
945 } else {
946 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
947 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
948 #endif
949 return HTTP_REAUTH;
950 }
951 } else {
952 #if LIBCURL_VERSION_NUM >= 0x070c00
953 if (!curl_errorstr[0])
954 strlcpy(curl_errorstr,
955 curl_easy_strerror(results->curl_result),
956 sizeof(curl_errorstr));
957 #endif
958 return HTTP_ERROR;
959 }
960 }
961
962 int run_one_slot(struct active_request_slot *slot,
963 struct slot_results *results)
964 {
965 slot->results = results;
966 if (!start_active_slot(slot)) {
967 snprintf(curl_errorstr, sizeof(curl_errorstr),
968 "failed to start HTTP request");
969 return HTTP_START_FAILED;
970 }
971
972 run_active_slot(slot);
973 return handle_curl_result(results);
974 }
975
976 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
977 {
978 char *ptr;
979 CURLcode ret;
980
981 strbuf_reset(buf);
982 ret = curl_easy_getinfo(curl, info, &ptr);
983 if (!ret && ptr)
984 strbuf_addstr(buf, ptr);
985 return ret;
986 }
987
988 /*
989 * Check for and extract a content-type parameter. "raw"
990 * should be positioned at the start of the potential
991 * parameter, with any whitespace already removed.
992 *
993 * "name" is the name of the parameter. The value is appended
994 * to "out".
995 */
996 static int extract_param(const char *raw, const char *name,
997 struct strbuf *out)
998 {
999 size_t len = strlen(name);
1000
1001 if (strncasecmp(raw, name, len))
1002 return -1;
1003 raw += len;
1004
1005 if (*raw != '=')
1006 return -1;
1007 raw++;
1008
1009 while (*raw && !isspace(*raw) && *raw != ';')
1010 strbuf_addch(out, *raw++);
1011 return 0;
1012 }
1013
1014 /*
1015 * Extract a normalized version of the content type, with any
1016 * spaces suppressed, all letters lowercased, and no trailing ";"
1017 * or parameters.
1018 *
1019 * Note that we will silently remove even invalid whitespace. For
1020 * example, "text / plain" is specifically forbidden by RFC 2616,
1021 * but "text/plain" is the only reasonable output, and this keeps
1022 * our code simple.
1023 *
1024 * If the "charset" argument is not NULL, store the value of any
1025 * charset parameter there.
1026 *
1027 * Example:
1028 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1029 * "text / plain" -> "text/plain"
1030 */
1031 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1032 struct strbuf *charset)
1033 {
1034 const char *p;
1035
1036 strbuf_reset(type);
1037 strbuf_grow(type, raw->len);
1038 for (p = raw->buf; *p; p++) {
1039 if (isspace(*p))
1040 continue;
1041 if (*p == ';') {
1042 p++;
1043 break;
1044 }
1045 strbuf_addch(type, tolower(*p));
1046 }
1047
1048 if (!charset)
1049 return;
1050
1051 strbuf_reset(charset);
1052 while (*p) {
1053 while (isspace(*p) || *p == ';')
1054 p++;
1055 if (!extract_param(p, "charset", charset))
1056 return;
1057 while (*p && !isspace(*p))
1058 p++;
1059 }
1060
1061 if (!charset->len && starts_with(type->buf, "text/"))
1062 strbuf_addstr(charset, "ISO-8859-1");
1063 }
1064
1065 static void write_accept_language(struct strbuf *buf)
1066 {
1067 /*
1068 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1069 * that, q-value will be smaller than 0.001, the minimum q-value the
1070 * HTTP specification allows. See
1071 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1072 */
1073 const int MAX_DECIMAL_PLACES = 3;
1074 const int MAX_LANGUAGE_TAGS = 1000;
1075 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1076 char **language_tags = NULL;
1077 int num_langs = 0;
1078 const char *s = get_preferred_languages();
1079 int i;
1080 struct strbuf tag = STRBUF_INIT;
1081
1082 /* Don't add Accept-Language header if no language is preferred. */
1083 if (!s)
1084 return;
1085
1086 /*
1087 * Split the colon-separated string of preferred languages into
1088 * language_tags array.
1089 */
1090 do {
1091 /* collect language tag */
1092 for (; *s && (isalnum(*s) || *s == '_'); s++)
1093 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1094
1095 /* skip .codeset, @modifier and any other unnecessary parts */
1096 while (*s && *s != ':')
1097 s++;
1098
1099 if (tag.len) {
1100 num_langs++;
1101 REALLOC_ARRAY(language_tags, num_langs);
1102 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1103 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1104 break;
1105 }
1106 } while (*s++);
1107
1108 /* write Accept-Language header into buf */
1109 if (num_langs) {
1110 int last_buf_len = 0;
1111 int max_q;
1112 int decimal_places;
1113 char q_format[32];
1114
1115 /* add '*' */
1116 REALLOC_ARRAY(language_tags, num_langs + 1);
1117 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1118
1119 /* compute decimal_places */
1120 for (max_q = 1, decimal_places = 0;
1121 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1122 decimal_places++, max_q *= 10)
1123 ;
1124
1125 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1126
1127 strbuf_addstr(buf, "Accept-Language: ");
1128
1129 for (i = 0; i < num_langs; i++) {
1130 if (i > 0)
1131 strbuf_addstr(buf, ", ");
1132
1133 strbuf_addstr(buf, language_tags[i]);
1134
1135 if (i > 0)
1136 strbuf_addf(buf, q_format, max_q - i);
1137
1138 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1139 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1140 break;
1141 }
1142
1143 last_buf_len = buf->len;
1144 }
1145 }
1146
1147 /* free language tags -- last one is a static '*' */
1148 for (i = 0; i < num_langs - 1; i++)
1149 free(language_tags[i]);
1150 free(language_tags);
1151 }
1152
1153 /*
1154 * Get an Accept-Language header which indicates user's preferred languages.
1155 *
1156 * Examples:
1157 * LANGUAGE= -> ""
1158 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1159 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1160 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1161 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1162 * LANGUAGE= LANG=C -> ""
1163 */
1164 static const char *get_accept_language(void)
1165 {
1166 if (!cached_accept_language) {
1167 struct strbuf buf = STRBUF_INIT;
1168 write_accept_language(&buf);
1169 if (buf.len > 0)
1170 cached_accept_language = strbuf_detach(&buf, NULL);
1171 }
1172
1173 return cached_accept_language;
1174 }
1175
1176 static void http_opt_request_remainder(CURL *curl, off_t pos)
1177 {
1178 char buf[128];
1179 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1180 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1181 }
1182
1183 /* http_request() targets */
1184 #define HTTP_REQUEST_STRBUF 0
1185 #define HTTP_REQUEST_FILE 1
1186
1187 static int http_request(const char *url,
1188 void *result, int target,
1189 const struct http_get_options *options)
1190 {
1191 struct active_request_slot *slot;
1192 struct slot_results results;
1193 struct curl_slist *headers = NULL;
1194 struct strbuf buf = STRBUF_INIT;
1195 const char *accept_language;
1196 int ret;
1197
1198 slot = get_active_slot();
1199 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1200
1201 if (result == NULL) {
1202 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1203 } else {
1204 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1205 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1206
1207 if (target == HTTP_REQUEST_FILE) {
1208 off_t posn = ftello(result);
1209 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1210 fwrite);
1211 if (posn > 0)
1212 http_opt_request_remainder(slot->curl, posn);
1213 } else
1214 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1215 fwrite_buffer);
1216 }
1217
1218 accept_language = get_accept_language();
1219
1220 if (accept_language)
1221 headers = curl_slist_append(headers, accept_language);
1222
1223 strbuf_addstr(&buf, "Pragma:");
1224 if (options && options->no_cache)
1225 strbuf_addstr(&buf, " no-cache");
1226 if (options && options->keep_error)
1227 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1228
1229 headers = curl_slist_append(headers, buf.buf);
1230
1231 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1232 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1233 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1234
1235 ret = run_one_slot(slot, &results);
1236
1237 if (options && options->content_type) {
1238 struct strbuf raw = STRBUF_INIT;
1239 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1240 extract_content_type(&raw, options->content_type,
1241 options->charset);
1242 strbuf_release(&raw);
1243 }
1244
1245 if (options && options->effective_url)
1246 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1247 options->effective_url);
1248
1249 curl_slist_free_all(headers);
1250 strbuf_release(&buf);
1251
1252 return ret;
1253 }
1254
1255 /*
1256 * Update the "base" url to a more appropriate value, as deduced by
1257 * redirects seen when requesting a URL starting with "url".
1258 *
1259 * The "asked" parameter is a URL that we asked curl to access, and must begin
1260 * with "base".
1261 *
1262 * The "got" parameter is the URL that curl reported to us as where we ended
1263 * up.
1264 *
1265 * Returns 1 if we updated the base url, 0 otherwise.
1266 *
1267 * Our basic strategy is to compare "base" and "asked" to find the bits
1268 * specific to our request. We then strip those bits off of "got" to yield the
1269 * new base. So for example, if our base is "http://example.com/foo.git",
1270 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1271 * with "https://other.example.com/foo.git/info/refs". We would want the
1272 * new URL to become "https://other.example.com/foo.git".
1273 *
1274 * Note that this assumes a sane redirect scheme. It's entirely possible
1275 * in the example above to end up at a URL that does not even end in
1276 * "info/refs". In such a case we simply punt, as there is not much we can
1277 * do (and such a scheme is unlikely to represent a real git repository,
1278 * which means we are likely about to abort anyway).
1279 */
1280 static int update_url_from_redirect(struct strbuf *base,
1281 const char *asked,
1282 const struct strbuf *got)
1283 {
1284 const char *tail;
1285 size_t tail_len;
1286
1287 if (!strcmp(asked, got->buf))
1288 return 0;
1289
1290 if (!skip_prefix(asked, base->buf, &tail))
1291 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1292 asked, base->buf);
1293
1294 tail_len = strlen(tail);
1295
1296 if (got->len < tail_len ||
1297 strcmp(tail, got->buf + got->len - tail_len))
1298 return 0; /* insane redirect scheme */
1299
1300 strbuf_reset(base);
1301 strbuf_add(base, got->buf, got->len - tail_len);
1302 return 1;
1303 }
1304
1305 static int http_request_reauth(const char *url,
1306 void *result, int target,
1307 struct http_get_options *options)
1308 {
1309 int ret = http_request(url, result, target, options);
1310
1311 if (options && options->effective_url && options->base_url) {
1312 if (update_url_from_redirect(options->base_url,
1313 url, options->effective_url)) {
1314 credential_from_url(&http_auth, options->base_url->buf);
1315 url = options->effective_url->buf;
1316 }
1317 }
1318
1319 if (ret != HTTP_REAUTH)
1320 return ret;
1321
1322 /*
1323 * If we are using KEEP_ERROR, the previous request may have
1324 * put cruft into our output stream; we should clear it out before
1325 * making our next request. We only know how to do this for
1326 * the strbuf case, but that is enough to satisfy current callers.
1327 */
1328 if (options && options->keep_error) {
1329 switch (target) {
1330 case HTTP_REQUEST_STRBUF:
1331 strbuf_reset(result);
1332 break;
1333 default:
1334 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1335 }
1336 }
1337
1338 credential_fill(&http_auth);
1339
1340 return http_request(url, result, target, options);
1341 }
1342
1343 int http_get_strbuf(const char *url,
1344 struct strbuf *result,
1345 struct http_get_options *options)
1346 {
1347 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1348 }
1349
1350 /*
1351 * Downloads a URL and stores the result in the given file.
1352 *
1353 * If a previous interrupted download is detected (i.e. a previous temporary
1354 * file is still around) the download is resumed.
1355 */
1356 static int http_get_file(const char *url, const char *filename,
1357 struct http_get_options *options)
1358 {
1359 int ret;
1360 struct strbuf tmpfile = STRBUF_INIT;
1361 FILE *result;
1362
1363 strbuf_addf(&tmpfile, "%s.temp", filename);
1364 result = fopen(tmpfile.buf, "a");
1365 if (!result) {
1366 error("Unable to open local file %s", tmpfile.buf);
1367 ret = HTTP_ERROR;
1368 goto cleanup;
1369 }
1370
1371 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1372 fclose(result);
1373
1374 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1375 ret = HTTP_ERROR;
1376 cleanup:
1377 strbuf_release(&tmpfile);
1378 return ret;
1379 }
1380
1381 int http_fetch_ref(const char *base, struct ref *ref)
1382 {
1383 struct http_get_options options = {0};
1384 char *url;
1385 struct strbuf buffer = STRBUF_INIT;
1386 int ret = -1;
1387
1388 options.no_cache = 1;
1389
1390 url = quote_ref_url(base, ref->name);
1391 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1392 strbuf_rtrim(&buffer);
1393 if (buffer.len == 40)
1394 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1395 else if (starts_with(buffer.buf, "ref: ")) {
1396 ref->symref = xstrdup(buffer.buf + 5);
1397 ret = 0;
1398 }
1399 }
1400
1401 strbuf_release(&buffer);
1402 free(url);
1403 return ret;
1404 }
1405
1406 /* Helpers for fetching packs */
1407 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1408 {
1409 char *url, *tmp;
1410 struct strbuf buf = STRBUF_INIT;
1411
1412 if (http_is_verbose)
1413 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1414
1415 end_url_with_slash(&buf, base_url);
1416 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1417 url = strbuf_detach(&buf, NULL);
1418
1419 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1420 tmp = strbuf_detach(&buf, NULL);
1421
1422 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1423 error("Unable to get pack index %s", url);
1424 free(tmp);
1425 tmp = NULL;
1426 }
1427
1428 free(url);
1429 return tmp;
1430 }
1431
1432 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1433 unsigned char *sha1, const char *base_url)
1434 {
1435 struct packed_git *new_pack;
1436 char *tmp_idx = NULL;
1437 int ret;
1438
1439 if (has_pack_index(sha1)) {
1440 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1441 if (!new_pack)
1442 return -1; /* parse_pack_index() already issued error message */
1443 goto add_pack;
1444 }
1445
1446 tmp_idx = fetch_pack_index(sha1, base_url);
1447 if (!tmp_idx)
1448 return -1;
1449
1450 new_pack = parse_pack_index(sha1, tmp_idx);
1451 if (!new_pack) {
1452 unlink(tmp_idx);
1453 free(tmp_idx);
1454
1455 return -1; /* parse_pack_index() already issued error message */
1456 }
1457
1458 ret = verify_pack_index(new_pack);
1459 if (!ret) {
1460 close_pack_index(new_pack);
1461 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1462 }
1463 free(tmp_idx);
1464 if (ret)
1465 return -1;
1466
1467 add_pack:
1468 new_pack->next = *packs_head;
1469 *packs_head = new_pack;
1470 return 0;
1471 }
1472
1473 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1474 {
1475 struct http_get_options options = {0};
1476 int ret = 0, i = 0;
1477 char *url, *data;
1478 struct strbuf buf = STRBUF_INIT;
1479 unsigned char sha1[20];
1480
1481 end_url_with_slash(&buf, base_url);
1482 strbuf_addstr(&buf, "objects/info/packs");
1483 url = strbuf_detach(&buf, NULL);
1484
1485 options.no_cache = 1;
1486 ret = http_get_strbuf(url, &buf, &options);
1487 if (ret != HTTP_OK)
1488 goto cleanup;
1489
1490 data = buf.buf;
1491 while (i < buf.len) {
1492 switch (data[i]) {
1493 case 'P':
1494 i++;
1495 if (i + 52 <= buf.len &&
1496 starts_with(data + i, " pack-") &&
1497 starts_with(data + i + 46, ".pack\n")) {
1498 get_sha1_hex(data + i + 6, sha1);
1499 fetch_and_setup_pack_index(packs_head, sha1,
1500 base_url);
1501 i += 51;
1502 break;
1503 }
1504 default:
1505 while (i < buf.len && data[i] != '\n')
1506 i++;
1507 }
1508 i++;
1509 }
1510
1511 cleanup:
1512 free(url);
1513 return ret;
1514 }
1515
1516 void release_http_pack_request(struct http_pack_request *preq)
1517 {
1518 if (preq->packfile != NULL) {
1519 fclose(preq->packfile);
1520 preq->packfile = NULL;
1521 }
1522 preq->slot = NULL;
1523 free(preq->url);
1524 free(preq);
1525 }
1526
1527 int finish_http_pack_request(struct http_pack_request *preq)
1528 {
1529 struct packed_git **lst;
1530 struct packed_git *p = preq->target;
1531 char *tmp_idx;
1532 size_t len;
1533 struct child_process ip = CHILD_PROCESS_INIT;
1534 const char *ip_argv[8];
1535
1536 close_pack_index(p);
1537
1538 fclose(preq->packfile);
1539 preq->packfile = NULL;
1540
1541 lst = preq->lst;
1542 while (*lst != p)
1543 lst = &((*lst)->next);
1544 *lst = (*lst)->next;
1545
1546 if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1547 die("BUG: pack tmpfile does not end in .pack.temp?");
1548 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1549
1550 ip_argv[0] = "index-pack";
1551 ip_argv[1] = "-o";
1552 ip_argv[2] = tmp_idx;
1553 ip_argv[3] = preq->tmpfile;
1554 ip_argv[4] = NULL;
1555
1556 ip.argv = ip_argv;
1557 ip.git_cmd = 1;
1558 ip.no_stdin = 1;
1559 ip.no_stdout = 1;
1560
1561 if (run_command(&ip)) {
1562 unlink(preq->tmpfile);
1563 unlink(tmp_idx);
1564 free(tmp_idx);
1565 return -1;
1566 }
1567
1568 unlink(sha1_pack_index_name(p->sha1));
1569
1570 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1571 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1572 free(tmp_idx);
1573 return -1;
1574 }
1575
1576 install_packed_git(p);
1577 free(tmp_idx);
1578 return 0;
1579 }
1580
1581 struct http_pack_request *new_http_pack_request(
1582 struct packed_git *target, const char *base_url)
1583 {
1584 off_t prev_posn = 0;
1585 struct strbuf buf = STRBUF_INIT;
1586 struct http_pack_request *preq;
1587
1588 preq = xcalloc(1, sizeof(*preq));
1589 preq->target = target;
1590
1591 end_url_with_slash(&buf, base_url);
1592 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1593 sha1_to_hex(target->sha1));
1594 preq->url = strbuf_detach(&buf, NULL);
1595
1596 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1597 sha1_pack_name(target->sha1));
1598 preq->packfile = fopen(preq->tmpfile, "a");
1599 if (!preq->packfile) {
1600 error("Unable to open local file %s for pack",
1601 preq->tmpfile);
1602 goto abort;
1603 }
1604
1605 preq->slot = get_active_slot();
1606 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1607 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1608 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1609 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1610 no_pragma_header);
1611
1612 /*
1613 * If there is data present from a previous transfer attempt,
1614 * resume where it left off
1615 */
1616 prev_posn = ftello(preq->packfile);
1617 if (prev_posn>0) {
1618 if (http_is_verbose)
1619 fprintf(stderr,
1620 "Resuming fetch of pack %s at byte %ld\n",
1621 sha1_to_hex(target->sha1), prev_posn);
1622 http_opt_request_remainder(preq->slot->curl, prev_posn);
1623 }
1624
1625 return preq;
1626
1627 abort:
1628 free(preq->url);
1629 free(preq);
1630 return NULL;
1631 }
1632
1633 /* Helpers for fetching objects (loose) */
1634 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1635 void *data)
1636 {
1637 unsigned char expn[4096];
1638 size_t size = eltsize * nmemb;
1639 int posn = 0;
1640 struct http_object_request *freq =
1641 (struct http_object_request *)data;
1642 do {
1643 ssize_t retval = xwrite(freq->localfile,
1644 (char *) ptr + posn, size - posn);
1645 if (retval < 0)
1646 return posn;
1647 posn += retval;
1648 } while (posn < size);
1649
1650 freq->stream.avail_in = size;
1651 freq->stream.next_in = (void *)ptr;
1652 do {
1653 freq->stream.next_out = expn;
1654 freq->stream.avail_out = sizeof(expn);
1655 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1656 git_SHA1_Update(&freq->c, expn,
1657 sizeof(expn) - freq->stream.avail_out);
1658 } while (freq->stream.avail_in && freq->zret == Z_OK);
1659 return size;
1660 }
1661
1662 struct http_object_request *new_http_object_request(const char *base_url,
1663 unsigned char *sha1)
1664 {
1665 char *hex = sha1_to_hex(sha1);
1666 const char *filename;
1667 char prevfile[PATH_MAX];
1668 int prevlocal;
1669 char prev_buf[PREV_BUF_SIZE];
1670 ssize_t prev_read = 0;
1671 off_t prev_posn = 0;
1672 struct http_object_request *freq;
1673
1674 freq = xcalloc(1, sizeof(*freq));
1675 hashcpy(freq->sha1, sha1);
1676 freq->localfile = -1;
1677
1678 filename = sha1_file_name(sha1);
1679 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1680 "%s.temp", filename);
1681
1682 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1683 unlink_or_warn(prevfile);
1684 rename(freq->tmpfile, prevfile);
1685 unlink_or_warn(freq->tmpfile);
1686
1687 if (freq->localfile != -1)
1688 error("fd leakage in start: %d", freq->localfile);
1689 freq->localfile = open(freq->tmpfile,
1690 O_WRONLY | O_CREAT | O_EXCL, 0666);
1691 /*
1692 * This could have failed due to the "lazy directory creation";
1693 * try to mkdir the last path component.
1694 */
1695 if (freq->localfile < 0 && errno == ENOENT) {
1696 char *dir = strrchr(freq->tmpfile, '/');
1697 if (dir) {
1698 *dir = 0;
1699 mkdir(freq->tmpfile, 0777);
1700 *dir = '/';
1701 }
1702 freq->localfile = open(freq->tmpfile,
1703 O_WRONLY | O_CREAT | O_EXCL, 0666);
1704 }
1705
1706 if (freq->localfile < 0) {
1707 error("Couldn't create temporary file %s: %s",
1708 freq->tmpfile, strerror(errno));
1709 goto abort;
1710 }
1711
1712 git_inflate_init(&freq->stream);
1713
1714 git_SHA1_Init(&freq->c);
1715
1716 freq->url = get_remote_object_url(base_url, hex, 0);
1717
1718 /*
1719 * If a previous temp file is present, process what was already
1720 * fetched.
1721 */
1722 prevlocal = open(prevfile, O_RDONLY);
1723 if (prevlocal != -1) {
1724 do {
1725 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1726 if (prev_read>0) {
1727 if (fwrite_sha1_file(prev_buf,
1728 1,
1729 prev_read,
1730 freq) == prev_read) {
1731 prev_posn += prev_read;
1732 } else {
1733 prev_read = -1;
1734 }
1735 }
1736 } while (prev_read > 0);
1737 close(prevlocal);
1738 }
1739 unlink_or_warn(prevfile);
1740
1741 /*
1742 * Reset inflate/SHA1 if there was an error reading the previous temp
1743 * file; also rewind to the beginning of the local file.
1744 */
1745 if (prev_read == -1) {
1746 memset(&freq->stream, 0, sizeof(freq->stream));
1747 git_inflate_init(&freq->stream);
1748 git_SHA1_Init(&freq->c);
1749 if (prev_posn>0) {
1750 prev_posn = 0;
1751 lseek(freq->localfile, 0, SEEK_SET);
1752 if (ftruncate(freq->localfile, 0) < 0) {
1753 error("Couldn't truncate temporary file %s: %s",
1754 freq->tmpfile, strerror(errno));
1755 goto abort;
1756 }
1757 }
1758 }
1759
1760 freq->slot = get_active_slot();
1761
1762 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1763 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1764 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1765 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1766 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1767
1768 /*
1769 * If we have successfully processed data from a previous fetch
1770 * attempt, only fetch the data we don't already have.
1771 */
1772 if (prev_posn>0) {
1773 if (http_is_verbose)
1774 fprintf(stderr,
1775 "Resuming fetch of object %s at byte %ld\n",
1776 hex, prev_posn);
1777 http_opt_request_remainder(freq->slot->curl, prev_posn);
1778 }
1779
1780 return freq;
1781
1782 abort:
1783 free(freq->url);
1784 free(freq);
1785 return NULL;
1786 }
1787
1788 void process_http_object_request(struct http_object_request *freq)
1789 {
1790 if (freq->slot == NULL)
1791 return;
1792 freq->curl_result = freq->slot->curl_result;
1793 freq->http_code = freq->slot->http_code;
1794 freq->slot = NULL;
1795 }
1796
1797 int finish_http_object_request(struct http_object_request *freq)
1798 {
1799 struct stat st;
1800
1801 close(freq->localfile);
1802 freq->localfile = -1;
1803
1804 process_http_object_request(freq);
1805
1806 if (freq->http_code == 416) {
1807 warning("requested range invalid; we may already have all the data.");
1808 } else if (freq->curl_result != CURLE_OK) {
1809 if (stat(freq->tmpfile, &st) == 0)
1810 if (st.st_size == 0)
1811 unlink_or_warn(freq->tmpfile);
1812 return -1;
1813 }
1814
1815 git_inflate_end(&freq->stream);
1816 git_SHA1_Final(freq->real_sha1, &freq->c);
1817 if (freq->zret != Z_STREAM_END) {
1818 unlink_or_warn(freq->tmpfile);
1819 return -1;
1820 }
1821 if (hashcmp(freq->sha1, freq->real_sha1)) {
1822 unlink_or_warn(freq->tmpfile);
1823 return -1;
1824 }
1825 freq->rename =
1826 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
1827
1828 return freq->rename;
1829 }
1830
1831 void abort_http_object_request(struct http_object_request *freq)
1832 {
1833 unlink_or_warn(freq->tmpfile);
1834
1835 release_http_object_request(freq);
1836 }
1837
1838 void release_http_object_request(struct http_object_request *freq)
1839 {
1840 if (freq->localfile != -1) {
1841 close(freq->localfile);
1842 freq->localfile = -1;
1843 }
1844 if (freq->url != NULL) {
1845 free(freq->url);
1846 freq->url = NULL;
1847 }
1848 if (freq->slot != NULL) {
1849 freq->slot->callback_func = NULL;
1850 freq->slot->callback_data = NULL;
1851 release_active_slot(freq->slot);
1852 freq->slot = NULL;
1853 }
1854 }
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