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Merge branch 'mk/submodule-gitdir-path' into maint
[git/debian.git] / http.c
blob0f924a8b48f3e30fd4a646ef48acb8d066988a53
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_string(&ssl_capath, var, value);
219 #endif
220 if (!strcmp("http.sslcainfo", var))
221 return git_config_string(&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 }
469 #if LIBCURL_VERSION_NUM >= 0x070a07
470 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
471 #endif
472
473 set_curl_keepalive(result);
474
475 return result;
476 }
477
478 static void set_from_env(const char **var, const char *envname)
479 {
480 const char *val = getenv(envname);
481 if (val)
482 *var = val;
483 }
484
485 void http_init(struct remote *remote, const char *url, int proactive_auth)
486 {
487 char *low_speed_limit;
488 char *low_speed_time;
489 char *normalized_url;
490 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
491
492 config.section = "http";
493 config.key = NULL;
494 config.collect_fn = http_options;
495 config.cascade_fn = git_default_config;
496 config.cb = NULL;
497
498 http_is_verbose = 0;
499 normalized_url = url_normalize(url, &config.url);
500
501 git_config(urlmatch_config_entry, &config);
502 free(normalized_url);
503
504 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
505 die("curl_global_init failed");
506
507 http_proactive_auth = proactive_auth;
508
509 if (remote && remote->http_proxy)
510 curl_http_proxy = xstrdup(remote->http_proxy);
511
512 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
513 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
514
515 #ifdef USE_CURL_MULTI
516 {
517 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
518 if (http_max_requests != NULL)
519 max_requests = atoi(http_max_requests);
520 }
521
522 curlm = curl_multi_init();
523 if (!curlm)
524 die("curl_multi_init failed");
525 #endif
526
527 if (getenv("GIT_SSL_NO_VERIFY"))
528 curl_ssl_verify = 0;
529
530 set_from_env(&ssl_cert, "GIT_SSL_CERT");
531 #if LIBCURL_VERSION_NUM >= 0x070903
532 set_from_env(&ssl_key, "GIT_SSL_KEY");
533 #endif
534 #if LIBCURL_VERSION_NUM >= 0x070908
535 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
536 #endif
537 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
538
539 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
540
541 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
542 if (low_speed_limit != NULL)
543 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
544 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
545 if (low_speed_time != NULL)
546 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
547
548 if (curl_ssl_verify == -1)
549 curl_ssl_verify = 1;
550
551 curl_session_count = 0;
552 #ifdef USE_CURL_MULTI
553 if (max_requests < 1)
554 max_requests = DEFAULT_MAX_REQUESTS;
555 #endif
556
557 if (getenv("GIT_CURL_FTP_NO_EPSV"))
558 curl_ftp_no_epsv = 1;
559
560 if (url) {
561 credential_from_url(&http_auth, url);
562 if (!ssl_cert_password_required &&
563 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
564 starts_with(url, "https://"))
565 ssl_cert_password_required = 1;
566 }
567
568 #ifndef NO_CURL_EASY_DUPHANDLE
569 curl_default = get_curl_handle();
570 #endif
571 }
572
573 void http_cleanup(void)
574 {
575 struct active_request_slot *slot = active_queue_head;
576
577 while (slot != NULL) {
578 struct active_request_slot *next = slot->next;
579 if (slot->curl != NULL) {
580 #ifdef USE_CURL_MULTI
581 curl_multi_remove_handle(curlm, slot->curl);
582 #endif
583 curl_easy_cleanup(slot->curl);
584 }
585 free(slot);
586 slot = next;
587 }
588 active_queue_head = NULL;
589
590 #ifndef NO_CURL_EASY_DUPHANDLE
591 curl_easy_cleanup(curl_default);
592 #endif
593
594 #ifdef USE_CURL_MULTI
595 curl_multi_cleanup(curlm);
596 #endif
597 curl_global_cleanup();
598
599 curl_slist_free_all(pragma_header);
600 pragma_header = NULL;
601
602 curl_slist_free_all(no_pragma_header);
603 no_pragma_header = NULL;
604
605 if (curl_http_proxy) {
606 free((void *)curl_http_proxy);
607 curl_http_proxy = NULL;
608 }
609
610 if (cert_auth.password != NULL) {
611 memset(cert_auth.password, 0, strlen(cert_auth.password));
612 free(cert_auth.password);
613 cert_auth.password = NULL;
614 }
615 ssl_cert_password_required = 0;
616
617 free(cached_accept_language);
618 cached_accept_language = NULL;
619 }
620
621 struct active_request_slot *get_active_slot(void)
622 {
623 struct active_request_slot *slot = active_queue_head;
624 struct active_request_slot *newslot;
625
626 #ifdef USE_CURL_MULTI
627 int num_transfers;
628
629 /* Wait for a slot to open up if the queue is full */
630 while (active_requests >= max_requests) {
631 curl_multi_perform(curlm, &num_transfers);
632 if (num_transfers < active_requests)
633 process_curl_messages();
634 }
635 #endif
636
637 while (slot != NULL && slot->in_use)
638 slot = slot->next;
639
640 if (slot == NULL) {
641 newslot = xmalloc(sizeof(*newslot));
642 newslot->curl = NULL;
643 newslot->in_use = 0;
644 newslot->next = NULL;
645
646 slot = active_queue_head;
647 if (slot == NULL) {
648 active_queue_head = newslot;
649 } else {
650 while (slot->next != NULL)
651 slot = slot->next;
652 slot->next = newslot;
653 }
654 slot = newslot;
655 }
656
657 if (slot->curl == NULL) {
658 #ifdef NO_CURL_EASY_DUPHANDLE
659 slot->curl = get_curl_handle();
660 #else
661 slot->curl = curl_easy_duphandle(curl_default);
662 #endif
663 curl_session_count++;
664 }
665
666 active_requests++;
667 slot->in_use = 1;
668 slot->results = NULL;
669 slot->finished = NULL;
670 slot->callback_data = NULL;
671 slot->callback_func = NULL;
672 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
673 if (curl_save_cookies)
674 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
675 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
676 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
677 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
678 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
679 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
680 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
681 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
682 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
683 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
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 sprintf(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 /* http_request() targets */
1177 #define HTTP_REQUEST_STRBUF 0
1178 #define HTTP_REQUEST_FILE 1
1179
1180 static int http_request(const char *url,
1181 void *result, int target,
1182 const struct http_get_options *options)
1183 {
1184 struct active_request_slot *slot;
1185 struct slot_results results;
1186 struct curl_slist *headers = NULL;
1187 struct strbuf buf = STRBUF_INIT;
1188 const char *accept_language;
1189 int ret;
1190
1191 slot = get_active_slot();
1192 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1193
1194 if (result == NULL) {
1195 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1196 } else {
1197 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1198 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1199
1200 if (target == HTTP_REQUEST_FILE) {
1201 long posn = ftell(result);
1202 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1203 fwrite);
1204 if (posn > 0) {
1205 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1206 headers = curl_slist_append(headers, buf.buf);
1207 strbuf_reset(&buf);
1208 }
1209 } else
1210 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1211 fwrite_buffer);
1212 }
1213
1214 accept_language = get_accept_language();
1215
1216 if (accept_language)
1217 headers = curl_slist_append(headers, accept_language);
1218
1219 strbuf_addstr(&buf, "Pragma:");
1220 if (options && options->no_cache)
1221 strbuf_addstr(&buf, " no-cache");
1222 if (options && options->keep_error)
1223 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1224
1225 headers = curl_slist_append(headers, buf.buf);
1226
1227 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1228 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1229 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1230
1231 ret = run_one_slot(slot, &results);
1232
1233 if (options && options->content_type) {
1234 struct strbuf raw = STRBUF_INIT;
1235 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1236 extract_content_type(&raw, options->content_type,
1237 options->charset);
1238 strbuf_release(&raw);
1239 }
1240
1241 if (options && options->effective_url)
1242 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1243 options->effective_url);
1244
1245 curl_slist_free_all(headers);
1246 strbuf_release(&buf);
1247
1248 return ret;
1249 }
1250
1251 /*
1252 * Update the "base" url to a more appropriate value, as deduced by
1253 * redirects seen when requesting a URL starting with "url".
1254 *
1255 * The "asked" parameter is a URL that we asked curl to access, and must begin
1256 * with "base".
1257 *
1258 * The "got" parameter is the URL that curl reported to us as where we ended
1259 * up.
1260 *
1261 * Returns 1 if we updated the base url, 0 otherwise.
1262 *
1263 * Our basic strategy is to compare "base" and "asked" to find the bits
1264 * specific to our request. We then strip those bits off of "got" to yield the
1265 * new base. So for example, if our base is "http://example.com/foo.git",
1266 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1267 * with "https://other.example.com/foo.git/info/refs". We would want the
1268 * new URL to become "https://other.example.com/foo.git".
1269 *
1270 * Note that this assumes a sane redirect scheme. It's entirely possible
1271 * in the example above to end up at a URL that does not even end in
1272 * "info/refs". In such a case we simply punt, as there is not much we can
1273 * do (and such a scheme is unlikely to represent a real git repository,
1274 * which means we are likely about to abort anyway).
1275 */
1276 static int update_url_from_redirect(struct strbuf *base,
1277 const char *asked,
1278 const struct strbuf *got)
1279 {
1280 const char *tail;
1281 size_t tail_len;
1282
1283 if (!strcmp(asked, got->buf))
1284 return 0;
1285
1286 if (!skip_prefix(asked, base->buf, &tail))
1287 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1288 asked, base->buf);
1289
1290 tail_len = strlen(tail);
1291
1292 if (got->len < tail_len ||
1293 strcmp(tail, got->buf + got->len - tail_len))
1294 return 0; /* insane redirect scheme */
1295
1296 strbuf_reset(base);
1297 strbuf_add(base, got->buf, got->len - tail_len);
1298 return 1;
1299 }
1300
1301 static int http_request_reauth(const char *url,
1302 void *result, int target,
1303 struct http_get_options *options)
1304 {
1305 int ret = http_request(url, result, target, options);
1306
1307 if (options && options->effective_url && options->base_url) {
1308 if (update_url_from_redirect(options->base_url,
1309 url, options->effective_url)) {
1310 credential_from_url(&http_auth, options->base_url->buf);
1311 url = options->effective_url->buf;
1312 }
1313 }
1314
1315 if (ret != HTTP_REAUTH)
1316 return ret;
1317
1318 /*
1319 * If we are using KEEP_ERROR, the previous request may have
1320 * put cruft into our output stream; we should clear it out before
1321 * making our next request. We only know how to do this for
1322 * the strbuf case, but that is enough to satisfy current callers.
1323 */
1324 if (options && options->keep_error) {
1325 switch (target) {
1326 case HTTP_REQUEST_STRBUF:
1327 strbuf_reset(result);
1328 break;
1329 default:
1330 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1331 }
1332 }
1333
1334 credential_fill(&http_auth);
1335
1336 return http_request(url, result, target, options);
1337 }
1338
1339 int http_get_strbuf(const char *url,
1340 struct strbuf *result,
1341 struct http_get_options *options)
1342 {
1343 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1344 }
1345
1346 /*
1347 * Downloads a URL and stores the result in the given file.
1348 *
1349 * If a previous interrupted download is detected (i.e. a previous temporary
1350 * file is still around) the download is resumed.
1351 */
1352 static int http_get_file(const char *url, const char *filename,
1353 struct http_get_options *options)
1354 {
1355 int ret;
1356 struct strbuf tmpfile = STRBUF_INIT;
1357 FILE *result;
1358
1359 strbuf_addf(&tmpfile, "%s.temp", filename);
1360 result = fopen(tmpfile.buf, "a");
1361 if (!result) {
1362 error("Unable to open local file %s", tmpfile.buf);
1363 ret = HTTP_ERROR;
1364 goto cleanup;
1365 }
1366
1367 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1368 fclose(result);
1369
1370 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1371 ret = HTTP_ERROR;
1372 cleanup:
1373 strbuf_release(&tmpfile);
1374 return ret;
1375 }
1376
1377 int http_fetch_ref(const char *base, struct ref *ref)
1378 {
1379 struct http_get_options options = {0};
1380 char *url;
1381 struct strbuf buffer = STRBUF_INIT;
1382 int ret = -1;
1383
1384 options.no_cache = 1;
1385
1386 url = quote_ref_url(base, ref->name);
1387 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1388 strbuf_rtrim(&buffer);
1389 if (buffer.len == 40)
1390 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1391 else if (starts_with(buffer.buf, "ref: ")) {
1392 ref->symref = xstrdup(buffer.buf + 5);
1393 ret = 0;
1394 }
1395 }
1396
1397 strbuf_release(&buffer);
1398 free(url);
1399 return ret;
1400 }
1401
1402 /* Helpers for fetching packs */
1403 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1404 {
1405 char *url, *tmp;
1406 struct strbuf buf = STRBUF_INIT;
1407
1408 if (http_is_verbose)
1409 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1410
1411 end_url_with_slash(&buf, base_url);
1412 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1413 url = strbuf_detach(&buf, NULL);
1414
1415 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1416 tmp = strbuf_detach(&buf, NULL);
1417
1418 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1419 error("Unable to get pack index %s", url);
1420 free(tmp);
1421 tmp = NULL;
1422 }
1423
1424 free(url);
1425 return tmp;
1426 }
1427
1428 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1429 unsigned char *sha1, const char *base_url)
1430 {
1431 struct packed_git *new_pack;
1432 char *tmp_idx = NULL;
1433 int ret;
1434
1435 if (has_pack_index(sha1)) {
1436 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1437 if (!new_pack)
1438 return -1; /* parse_pack_index() already issued error message */
1439 goto add_pack;
1440 }
1441
1442 tmp_idx = fetch_pack_index(sha1, base_url);
1443 if (!tmp_idx)
1444 return -1;
1445
1446 new_pack = parse_pack_index(sha1, tmp_idx);
1447 if (!new_pack) {
1448 unlink(tmp_idx);
1449 free(tmp_idx);
1450
1451 return -1; /* parse_pack_index() already issued error message */
1452 }
1453
1454 ret = verify_pack_index(new_pack);
1455 if (!ret) {
1456 close_pack_index(new_pack);
1457 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1458 }
1459 free(tmp_idx);
1460 if (ret)
1461 return -1;
1462
1463 add_pack:
1464 new_pack->next = *packs_head;
1465 *packs_head = new_pack;
1466 return 0;
1467 }
1468
1469 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1470 {
1471 struct http_get_options options = {0};
1472 int ret = 0, i = 0;
1473 char *url, *data;
1474 struct strbuf buf = STRBUF_INIT;
1475 unsigned char sha1[20];
1476
1477 end_url_with_slash(&buf, base_url);
1478 strbuf_addstr(&buf, "objects/info/packs");
1479 url = strbuf_detach(&buf, NULL);
1480
1481 options.no_cache = 1;
1482 ret = http_get_strbuf(url, &buf, &options);
1483 if (ret != HTTP_OK)
1484 goto cleanup;
1485
1486 data = buf.buf;
1487 while (i < buf.len) {
1488 switch (data[i]) {
1489 case 'P':
1490 i++;
1491 if (i + 52 <= buf.len &&
1492 starts_with(data + i, " pack-") &&
1493 starts_with(data + i + 46, ".pack\n")) {
1494 get_sha1_hex(data + i + 6, sha1);
1495 fetch_and_setup_pack_index(packs_head, sha1,
1496 base_url);
1497 i += 51;
1498 break;
1499 }
1500 default:
1501 while (i < buf.len && data[i] != '\n')
1502 i++;
1503 }
1504 i++;
1505 }
1506
1507 cleanup:
1508 free(url);
1509 return ret;
1510 }
1511
1512 void release_http_pack_request(struct http_pack_request *preq)
1513 {
1514 if (preq->packfile != NULL) {
1515 fclose(preq->packfile);
1516 preq->packfile = NULL;
1517 }
1518 if (preq->range_header != NULL) {
1519 curl_slist_free_all(preq->range_header);
1520 preq->range_header = 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 struct child_process ip = CHILD_PROCESS_INIT;
1533 const char *ip_argv[8];
1534
1535 close_pack_index(p);
1536
1537 fclose(preq->packfile);
1538 preq->packfile = NULL;
1539
1540 lst = preq->lst;
1541 while (*lst != p)
1542 lst = &((*lst)->next);
1543 *lst = (*lst)->next;
1544
1545 tmp_idx = xstrdup(preq->tmpfile);
1546 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1547 ".idx.temp");
1548
1549 ip_argv[0] = "index-pack";
1550 ip_argv[1] = "-o";
1551 ip_argv[2] = tmp_idx;
1552 ip_argv[3] = preq->tmpfile;
1553 ip_argv[4] = NULL;
1554
1555 ip.argv = ip_argv;
1556 ip.git_cmd = 1;
1557 ip.no_stdin = 1;
1558 ip.no_stdout = 1;
1559
1560 if (run_command(&ip)) {
1561 unlink(preq->tmpfile);
1562 unlink(tmp_idx);
1563 free(tmp_idx);
1564 return -1;
1565 }
1566
1567 unlink(sha1_pack_index_name(p->sha1));
1568
1569 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1570 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1571 free(tmp_idx);
1572 return -1;
1573 }
1574
1575 install_packed_git(p);
1576 free(tmp_idx);
1577 return 0;
1578 }
1579
1580 struct http_pack_request *new_http_pack_request(
1581 struct packed_git *target, const char *base_url)
1582 {
1583 long prev_posn = 0;
1584 char range[RANGE_HEADER_SIZE];
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 = ftell(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 sprintf(range, "Range: bytes=%ld-", prev_posn);
1623 preq->range_header = curl_slist_append(NULL, range);
1624 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1625 preq->range_header);
1626 }
1627
1628 return preq;
1629
1630 abort:
1631 free(preq->url);
1632 free(preq);
1633 return NULL;
1634 }
1635
1636 /* Helpers for fetching objects (loose) */
1637 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1638 void *data)
1639 {
1640 unsigned char expn[4096];
1641 size_t size = eltsize * nmemb;
1642 int posn = 0;
1643 struct http_object_request *freq =
1644 (struct http_object_request *)data;
1645 do {
1646 ssize_t retval = xwrite(freq->localfile,
1647 (char *) ptr + posn, size - posn);
1648 if (retval < 0)
1649 return posn;
1650 posn += retval;
1651 } while (posn < size);
1652
1653 freq->stream.avail_in = size;
1654 freq->stream.next_in = (void *)ptr;
1655 do {
1656 freq->stream.next_out = expn;
1657 freq->stream.avail_out = sizeof(expn);
1658 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1659 git_SHA1_Update(&freq->c, expn,
1660 sizeof(expn) - freq->stream.avail_out);
1661 } while (freq->stream.avail_in && freq->zret == Z_OK);
1662 return size;
1663 }
1664
1665 struct http_object_request *new_http_object_request(const char *base_url,
1666 unsigned char *sha1)
1667 {
1668 char *hex = sha1_to_hex(sha1);
1669 const char *filename;
1670 char prevfile[PATH_MAX];
1671 int prevlocal;
1672 char prev_buf[PREV_BUF_SIZE];
1673 ssize_t prev_read = 0;
1674 long prev_posn = 0;
1675 char range[RANGE_HEADER_SIZE];
1676 struct curl_slist *range_header = NULL;
1677 struct http_object_request *freq;
1678
1679 freq = xcalloc(1, sizeof(*freq));
1680 hashcpy(freq->sha1, sha1);
1681 freq->localfile = -1;
1682
1683 filename = sha1_file_name(sha1);
1684 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1685 "%s.temp", filename);
1686
1687 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1688 unlink_or_warn(prevfile);
1689 rename(freq->tmpfile, prevfile);
1690 unlink_or_warn(freq->tmpfile);
1691
1692 if (freq->localfile != -1)
1693 error("fd leakage in start: %d", freq->localfile);
1694 freq->localfile = open(freq->tmpfile,
1695 O_WRONLY | O_CREAT | O_EXCL, 0666);
1696 /*
1697 * This could have failed due to the "lazy directory creation";
1698 * try to mkdir the last path component.
1699 */
1700 if (freq->localfile < 0 && errno == ENOENT) {
1701 char *dir = strrchr(freq->tmpfile, '/');
1702 if (dir) {
1703 *dir = 0;
1704 mkdir(freq->tmpfile, 0777);
1705 *dir = '/';
1706 }
1707 freq->localfile = open(freq->tmpfile,
1708 O_WRONLY | O_CREAT | O_EXCL, 0666);
1709 }
1710
1711 if (freq->localfile < 0) {
1712 error("Couldn't create temporary file %s: %s",
1713 freq->tmpfile, strerror(errno));
1714 goto abort;
1715 }
1716
1717 git_inflate_init(&freq->stream);
1718
1719 git_SHA1_Init(&freq->c);
1720
1721 freq->url = get_remote_object_url(base_url, hex, 0);
1722
1723 /*
1724 * If a previous temp file is present, process what was already
1725 * fetched.
1726 */
1727 prevlocal = open(prevfile, O_RDONLY);
1728 if (prevlocal != -1) {
1729 do {
1730 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1731 if (prev_read>0) {
1732 if (fwrite_sha1_file(prev_buf,
1733 1,
1734 prev_read,
1735 freq) == prev_read) {
1736 prev_posn += prev_read;
1737 } else {
1738 prev_read = -1;
1739 }
1740 }
1741 } while (prev_read > 0);
1742 close(prevlocal);
1743 }
1744 unlink_or_warn(prevfile);
1745
1746 /*
1747 * Reset inflate/SHA1 if there was an error reading the previous temp
1748 * file; also rewind to the beginning of the local file.
1749 */
1750 if (prev_read == -1) {
1751 memset(&freq->stream, 0, sizeof(freq->stream));
1752 git_inflate_init(&freq->stream);
1753 git_SHA1_Init(&freq->c);
1754 if (prev_posn>0) {
1755 prev_posn = 0;
1756 lseek(freq->localfile, 0, SEEK_SET);
1757 if (ftruncate(freq->localfile, 0) < 0) {
1758 error("Couldn't truncate temporary file %s: %s",
1759 freq->tmpfile, strerror(errno));
1760 goto abort;
1761 }
1762 }
1763 }
1764
1765 freq->slot = get_active_slot();
1766
1767 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1768 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1769 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1770 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1771 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1772
1773 /*
1774 * If we have successfully processed data from a previous fetch
1775 * attempt, only fetch the data we don't already have.
1776 */
1777 if (prev_posn>0) {
1778 if (http_is_verbose)
1779 fprintf(stderr,
1780 "Resuming fetch of object %s at byte %ld\n",
1781 hex, prev_posn);
1782 sprintf(range, "Range: bytes=%ld-", prev_posn);
1783 range_header = curl_slist_append(range_header, range);
1784 curl_easy_setopt(freq->slot->curl,
1785 CURLOPT_HTTPHEADER, range_header);
1786 }
1787
1788 return freq;
1789
1790 abort:
1791 free(freq->url);
1792 free(freq);
1793 return NULL;
1794 }
1795
1796 void process_http_object_request(struct http_object_request *freq)
1797 {
1798 if (freq->slot == NULL)
1799 return;
1800 freq->curl_result = freq->slot->curl_result;
1801 freq->http_code = freq->slot->http_code;
1802 freq->slot = NULL;
1803 }
1804
1805 int finish_http_object_request(struct http_object_request *freq)
1806 {
1807 struct stat st;
1808
1809 close(freq->localfile);
1810 freq->localfile = -1;
1811
1812 process_http_object_request(freq);
1813
1814 if (freq->http_code == 416) {
1815 warning("requested range invalid; we may already have all the data.");
1816 } else if (freq->curl_result != CURLE_OK) {
1817 if (stat(freq->tmpfile, &st) == 0)
1818 if (st.st_size == 0)
1819 unlink_or_warn(freq->tmpfile);
1820 return -1;
1821 }
1822
1823 git_inflate_end(&freq->stream);
1824 git_SHA1_Final(freq->real_sha1, &freq->c);
1825 if (freq->zret != Z_STREAM_END) {
1826 unlink_or_warn(freq->tmpfile);
1827 return -1;
1828 }
1829 if (hashcmp(freq->sha1, freq->real_sha1)) {
1830 unlink_or_warn(freq->tmpfile);
1831 return -1;
1832 }
1833 freq->rename =
1834 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
1835
1836 return freq->rename;
1837 }
1838
1839 void abort_http_object_request(struct http_object_request *freq)
1840 {
1841 unlink_or_warn(freq->tmpfile);
1842
1843 release_http_object_request(freq);
1844 }
1845
1846 void release_http_object_request(struct http_object_request *freq)
1847 {
1848 if (freq->localfile != -1) {
1849 close(freq->localfile);
1850 freq->localfile = -1;
1851 }
1852 if (freq->url != NULL) {
1853 free(freq->url);
1854 freq->url = NULL;
1855 }
1856 if (freq->slot != NULL) {
1857 freq->slot->callback_func = NULL;
1858 freq->slot->callback_data = NULL;
1859 release_active_slot(freq->slot);
1860 freq->slot = NULL;
1861 }
1862 }
git for Debian