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http: implement public key pinning
[git/debian.git] / http.c
blob34750401078be6afe9d464ee2b26f91490458613
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 #if LIBCURL_VERSION_NUM >= 0x072c00
61 static const char *ssl_pinnedkey;
62 #endif
63 static const char *ssl_cainfo;
64 static long curl_low_speed_limit = -1;
65 static long curl_low_speed_time = -1;
66 static int curl_ftp_no_epsv;
67 static const char *curl_http_proxy;
68 static const char *curl_cookie_file;
69 static int curl_save_cookies;
70 struct credential http_auth = CREDENTIAL_INIT;
71 static int http_proactive_auth;
72 static const char *user_agent;
73
74 #if LIBCURL_VERSION_NUM >= 0x071700
75 /* Use CURLOPT_KEYPASSWD as is */
76 #elif LIBCURL_VERSION_NUM >= 0x070903
77 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
78 #else
79 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
80 #endif
81
82 static struct credential cert_auth = CREDENTIAL_INIT;
83 static int ssl_cert_password_required;
84 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
85 static unsigned long http_auth_methods = CURLAUTH_ANY;
86 #endif
87
88 static struct curl_slist *pragma_header;
89 static struct curl_slist *no_pragma_header;
90
91 static struct active_request_slot *active_queue_head;
92
93 static char *cached_accept_language;
94
95 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
96 {
97 size_t size = eltsize * nmemb;
98 struct buffer *buffer = buffer_;
99
100 if (size > buffer->buf.len - buffer->posn)
101 size = buffer->buf.len - buffer->posn;
102 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
103 buffer->posn += size;
104
105 return size;
106 }
107
108 #ifndef NO_CURL_IOCTL
109 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
110 {
111 struct buffer *buffer = clientp;
112
113 switch (cmd) {
114 case CURLIOCMD_NOP:
115 return CURLIOE_OK;
116
117 case CURLIOCMD_RESTARTREAD:
118 buffer->posn = 0;
119 return CURLIOE_OK;
120
121 default:
122 return CURLIOE_UNKNOWNCMD;
123 }
124 }
125 #endif
126
127 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
128 {
129 size_t size = eltsize * nmemb;
130 struct strbuf *buffer = buffer_;
131
132 strbuf_add(buffer, ptr, size);
133 return size;
134 }
135
136 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
137 {
138 return eltsize * nmemb;
139 }
140
141 static void closedown_active_slot(struct active_request_slot *slot)
142 {
143 active_requests--;
144 slot->in_use = 0;
145 }
146
147 static void finish_active_slot(struct active_request_slot *slot)
148 {
149 closedown_active_slot(slot);
150 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
151
152 if (slot->finished != NULL)
153 (*slot->finished) = 1;
154
155 /* Store slot results so they can be read after the slot is reused */
156 if (slot->results != NULL) {
157 slot->results->curl_result = slot->curl_result;
158 slot->results->http_code = slot->http_code;
159 #if LIBCURL_VERSION_NUM >= 0x070a08
160 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
161 &slot->results->auth_avail);
162 #else
163 slot->results->auth_avail = 0;
164 #endif
165 }
166
167 /* Run callback if appropriate */
168 if (slot->callback_func != NULL)
169 slot->callback_func(slot->callback_data);
170 }
171
172 #ifdef USE_CURL_MULTI
173 static void process_curl_messages(void)
174 {
175 int num_messages;
176 struct active_request_slot *slot;
177 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
178
179 while (curl_message != NULL) {
180 if (curl_message->msg == CURLMSG_DONE) {
181 int curl_result = curl_message->data.result;
182 slot = active_queue_head;
183 while (slot != NULL &&
184 slot->curl != curl_message->easy_handle)
185 slot = slot->next;
186 if (slot != NULL) {
187 curl_multi_remove_handle(curlm, slot->curl);
188 slot->curl_result = curl_result;
189 finish_active_slot(slot);
190 } else {
191 fprintf(stderr, "Received DONE message for unknown request!\n");
192 }
193 } else {
194 fprintf(stderr, "Unknown CURL message received: %d\n",
195 (int)curl_message->msg);
196 }
197 curl_message = curl_multi_info_read(curlm, &num_messages);
198 }
199 }
200 #endif
201
202 static int http_options(const char *var, const char *value, void *cb)
203 {
204 if (!strcmp("http.sslverify", var)) {
205 curl_ssl_verify = git_config_bool(var, value);
206 return 0;
207 }
208 if (!strcmp("http.sslcipherlist", var))
209 return git_config_string(&ssl_cipherlist, var, value);
210 if (!strcmp("http.sslversion", var))
211 return git_config_string(&ssl_version, var, value);
212 if (!strcmp("http.sslcert", var))
213 return git_config_string(&ssl_cert, var, value);
214 #if LIBCURL_VERSION_NUM >= 0x070903
215 if (!strcmp("http.sslkey", var))
216 return git_config_string(&ssl_key, var, value);
217 #endif
218 #if LIBCURL_VERSION_NUM >= 0x070908
219 if (!strcmp("http.sslcapath", var))
220 return git_config_pathname(&ssl_capath, var, value);
221 #endif
222 if (!strcmp("http.sslcainfo", var))
223 return git_config_pathname(&ssl_cainfo, var, value);
224 if (!strcmp("http.sslcertpasswordprotected", var)) {
225 ssl_cert_password_required = git_config_bool(var, value);
226 return 0;
227 }
228 if (!strcmp("http.ssltry", var)) {
229 curl_ssl_try = git_config_bool(var, value);
230 return 0;
231 }
232 if (!strcmp("http.minsessions", var)) {
233 min_curl_sessions = git_config_int(var, value);
234 #ifndef USE_CURL_MULTI
235 if (min_curl_sessions > 1)
236 min_curl_sessions = 1;
237 #endif
238 return 0;
239 }
240 #ifdef USE_CURL_MULTI
241 if (!strcmp("http.maxrequests", var)) {
242 max_requests = git_config_int(var, value);
243 return 0;
244 }
245 #endif
246 if (!strcmp("http.lowspeedlimit", var)) {
247 curl_low_speed_limit = (long)git_config_int(var, value);
248 return 0;
249 }
250 if (!strcmp("http.lowspeedtime", var)) {
251 curl_low_speed_time = (long)git_config_int(var, value);
252 return 0;
253 }
254
255 if (!strcmp("http.noepsv", var)) {
256 curl_ftp_no_epsv = git_config_bool(var, value);
257 return 0;
258 }
259 if (!strcmp("http.proxy", var))
260 return git_config_string(&curl_http_proxy, var, value);
261
262 if (!strcmp("http.cookiefile", var))
263 return git_config_string(&curl_cookie_file, var, value);
264 if (!strcmp("http.savecookies", var)) {
265 curl_save_cookies = git_config_bool(var, value);
266 return 0;
267 }
268
269 if (!strcmp("http.postbuffer", var)) {
270 http_post_buffer = git_config_int(var, value);
271 if (http_post_buffer < LARGE_PACKET_MAX)
272 http_post_buffer = LARGE_PACKET_MAX;
273 return 0;
274 }
275
276 if (!strcmp("http.useragent", var))
277 return git_config_string(&user_agent, var, value);
278
279 if (!strcmp("http.pinnedpubkey", var)) {
280 #if LIBCURL_VERSION_NUM >= 0x072c00
281 return git_config_pathname(&ssl_pinnedkey, var, value);
282 #else
283 warning(_("Public key pinning not supported with cURL < 7.44.0"));
284 return 0;
285 #endif
286 }
287 /* Fall back on the default ones */
288 return git_default_config(var, value, cb);
289 }
290
291 static void init_curl_http_auth(CURL *result)
292 {
293 if (!http_auth.username)
294 return;
295
296 credential_fill(&http_auth);
297
298 #if LIBCURL_VERSION_NUM >= 0x071301
299 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
300 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
301 #else
302 {
303 static struct strbuf up = STRBUF_INIT;
304 /*
305 * Note that we assume we only ever have a single set of
306 * credentials in a given program run, so we do not have
307 * to worry about updating this buffer, only setting its
308 * initial value.
309 */
310 if (!up.len)
311 strbuf_addf(&up, "%s:%s",
312 http_auth.username, http_auth.password);
313 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
314 }
315 #endif
316 }
317
318 static int has_cert_password(void)
319 {
320 if (ssl_cert == NULL || ssl_cert_password_required != 1)
321 return 0;
322 if (!cert_auth.password) {
323 cert_auth.protocol = xstrdup("cert");
324 cert_auth.username = xstrdup("");
325 cert_auth.path = xstrdup(ssl_cert);
326 credential_fill(&cert_auth);
327 }
328 return 1;
329 }
330
331 #if LIBCURL_VERSION_NUM >= 0x071900
332 static void set_curl_keepalive(CURL *c)
333 {
334 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
335 }
336
337 #elif LIBCURL_VERSION_NUM >= 0x071000
338 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
339 {
340 int ka = 1;
341 int rc;
342 socklen_t len = (socklen_t)sizeof(ka);
343
344 if (type != CURLSOCKTYPE_IPCXN)
345 return 0;
346
347 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
348 if (rc < 0)
349 warning("unable to set SO_KEEPALIVE on socket %s",
350 strerror(errno));
351
352 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
353 }
354
355 static void set_curl_keepalive(CURL *c)
356 {
357 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
358 }
359
360 #else
361 static void set_curl_keepalive(CURL *c)
362 {
363 /* not supported on older curl versions */
364 }
365 #endif
366
367 static CURL *get_curl_handle(void)
368 {
369 CURL *result = curl_easy_init();
370 long allowed_protocols = 0;
371
372 if (!result)
373 die("curl_easy_init failed");
374
375 if (!curl_ssl_verify) {
376 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
377 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
378 } else {
379 /* Verify authenticity of the peer's certificate */
380 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
381 /* The name in the cert must match whom we tried to connect */
382 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
383 }
384
385 #if LIBCURL_VERSION_NUM >= 0x070907
386 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
387 #endif
388 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
389 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
390 #endif
391
392 if (http_proactive_auth)
393 init_curl_http_auth(result);
394
395 if (getenv("GIT_SSL_VERSION"))
396 ssl_version = getenv("GIT_SSL_VERSION");
397 if (ssl_version && *ssl_version) {
398 int i;
399 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
400 if (!strcmp(ssl_version, sslversions[i].name)) {
401 curl_easy_setopt(result, CURLOPT_SSLVERSION,
402 sslversions[i].ssl_version);
403 break;
404 }
405 }
406 if (i == ARRAY_SIZE(sslversions))
407 warning("unsupported ssl version %s: using default",
408 ssl_version);
409 }
410
411 if (getenv("GIT_SSL_CIPHER_LIST"))
412 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
413 if (ssl_cipherlist != NULL && *ssl_cipherlist)
414 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
415 ssl_cipherlist);
416
417 if (ssl_cert != NULL)
418 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
419 if (has_cert_password())
420 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
421 #if LIBCURL_VERSION_NUM >= 0x070903
422 if (ssl_key != NULL)
423 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
424 #endif
425 #if LIBCURL_VERSION_NUM >= 0x070908
426 if (ssl_capath != NULL)
427 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
428 #endif
429 #if LIBCURL_VERSION_NUM >= 0x072c00
430 if (ssl_pinnedkey != NULL)
431 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
432 #endif
433 if (ssl_cainfo != NULL)
434 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
435
436 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
437 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
438 curl_low_speed_limit);
439 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
440 curl_low_speed_time);
441 }
442
443 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
444 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
445 #if LIBCURL_VERSION_NUM >= 0x071301
446 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
447 #elif LIBCURL_VERSION_NUM >= 0x071101
448 curl_easy_setopt(result, CURLOPT_POST301, 1);
449 #endif
450 #if LIBCURL_VERSION_NUM >= 0x071304
451 if (is_transport_allowed("http"))
452 allowed_protocols |= CURLPROTO_HTTP;
453 if (is_transport_allowed("https"))
454 allowed_protocols |= CURLPROTO_HTTPS;
455 if (is_transport_allowed("ftp"))
456 allowed_protocols |= CURLPROTO_FTP;
457 if (is_transport_allowed("ftps"))
458 allowed_protocols |= CURLPROTO_FTPS;
459 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
460 #else
461 if (transport_restrict_protocols())
462 warning("protocol restrictions not applied to curl redirects because\n"
463 "your curl version is too old (>= 7.19.4)");
464 #endif
465
466 if (getenv("GIT_CURL_VERBOSE"))
467 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
468
469 curl_easy_setopt(result, CURLOPT_USERAGENT,
470 user_agent ? user_agent : git_user_agent());
471
472 if (curl_ftp_no_epsv)
473 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
474
475 #ifdef CURLOPT_USE_SSL
476 if (curl_ssl_try)
477 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
478 #endif
479
480 if (curl_http_proxy) {
481 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
482 #if LIBCURL_VERSION_NUM >= 0x071800
483 if (starts_with(curl_http_proxy, "socks5"))
484 curl_easy_setopt(result,
485 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
486 else if (starts_with(curl_http_proxy, "socks4a"))
487 curl_easy_setopt(result,
488 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
489 else if (starts_with(curl_http_proxy, "socks"))
490 curl_easy_setopt(result,
491 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
492 #endif
493 }
494 #if LIBCURL_VERSION_NUM >= 0x070a07
495 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
496 #endif
497
498 set_curl_keepalive(result);
499
500 return result;
501 }
502
503 static void set_from_env(const char **var, const char *envname)
504 {
505 const char *val = getenv(envname);
506 if (val)
507 *var = val;
508 }
509
510 void http_init(struct remote *remote, const char *url, int proactive_auth)
511 {
512 char *low_speed_limit;
513 char *low_speed_time;
514 char *normalized_url;
515 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
516
517 config.section = "http";
518 config.key = NULL;
519 config.collect_fn = http_options;
520 config.cascade_fn = git_default_config;
521 config.cb = NULL;
522
523 http_is_verbose = 0;
524 normalized_url = url_normalize(url, &config.url);
525
526 git_config(urlmatch_config_entry, &config);
527 free(normalized_url);
528
529 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
530 die("curl_global_init failed");
531
532 http_proactive_auth = proactive_auth;
533
534 if (remote && remote->http_proxy)
535 curl_http_proxy = xstrdup(remote->http_proxy);
536
537 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
538 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
539
540 #ifdef USE_CURL_MULTI
541 {
542 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
543 if (http_max_requests != NULL)
544 max_requests = atoi(http_max_requests);
545 }
546
547 curlm = curl_multi_init();
548 if (!curlm)
549 die("curl_multi_init failed");
550 #endif
551
552 if (getenv("GIT_SSL_NO_VERIFY"))
553 curl_ssl_verify = 0;
554
555 set_from_env(&ssl_cert, "GIT_SSL_CERT");
556 #if LIBCURL_VERSION_NUM >= 0x070903
557 set_from_env(&ssl_key, "GIT_SSL_KEY");
558 #endif
559 #if LIBCURL_VERSION_NUM >= 0x070908
560 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
561 #endif
562 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
563
564 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
565
566 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
567 if (low_speed_limit != NULL)
568 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
569 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
570 if (low_speed_time != NULL)
571 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
572
573 if (curl_ssl_verify == -1)
574 curl_ssl_verify = 1;
575
576 curl_session_count = 0;
577 #ifdef USE_CURL_MULTI
578 if (max_requests < 1)
579 max_requests = DEFAULT_MAX_REQUESTS;
580 #endif
581
582 if (getenv("GIT_CURL_FTP_NO_EPSV"))
583 curl_ftp_no_epsv = 1;
584
585 if (url) {
586 credential_from_url(&http_auth, url);
587 if (!ssl_cert_password_required &&
588 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
589 starts_with(url, "https://"))
590 ssl_cert_password_required = 1;
591 }
592
593 #ifndef NO_CURL_EASY_DUPHANDLE
594 curl_default = get_curl_handle();
595 #endif
596 }
597
598 void http_cleanup(void)
599 {
600 struct active_request_slot *slot = active_queue_head;
601
602 while (slot != NULL) {
603 struct active_request_slot *next = slot->next;
604 if (slot->curl != NULL) {
605 #ifdef USE_CURL_MULTI
606 curl_multi_remove_handle(curlm, slot->curl);
607 #endif
608 curl_easy_cleanup(slot->curl);
609 }
610 free(slot);
611 slot = next;
612 }
613 active_queue_head = NULL;
614
615 #ifndef NO_CURL_EASY_DUPHANDLE
616 curl_easy_cleanup(curl_default);
617 #endif
618
619 #ifdef USE_CURL_MULTI
620 curl_multi_cleanup(curlm);
621 #endif
622 curl_global_cleanup();
623
624 curl_slist_free_all(pragma_header);
625 pragma_header = NULL;
626
627 curl_slist_free_all(no_pragma_header);
628 no_pragma_header = NULL;
629
630 if (curl_http_proxy) {
631 free((void *)curl_http_proxy);
632 curl_http_proxy = NULL;
633 }
634
635 if (cert_auth.password != NULL) {
636 memset(cert_auth.password, 0, strlen(cert_auth.password));
637 free(cert_auth.password);
638 cert_auth.password = NULL;
639 }
640 ssl_cert_password_required = 0;
641
642 free(cached_accept_language);
643 cached_accept_language = NULL;
644 }
645
646 struct active_request_slot *get_active_slot(void)
647 {
648 struct active_request_slot *slot = active_queue_head;
649 struct active_request_slot *newslot;
650
651 #ifdef USE_CURL_MULTI
652 int num_transfers;
653
654 /* Wait for a slot to open up if the queue is full */
655 while (active_requests >= max_requests) {
656 curl_multi_perform(curlm, &num_transfers);
657 if (num_transfers < active_requests)
658 process_curl_messages();
659 }
660 #endif
661
662 while (slot != NULL && slot->in_use)
663 slot = slot->next;
664
665 if (slot == NULL) {
666 newslot = xmalloc(sizeof(*newslot));
667 newslot->curl = NULL;
668 newslot->in_use = 0;
669 newslot->next = NULL;
670
671 slot = active_queue_head;
672 if (slot == NULL) {
673 active_queue_head = newslot;
674 } else {
675 while (slot->next != NULL)
676 slot = slot->next;
677 slot->next = newslot;
678 }
679 slot = newslot;
680 }
681
682 if (slot->curl == NULL) {
683 #ifdef NO_CURL_EASY_DUPHANDLE
684 slot->curl = get_curl_handle();
685 #else
686 slot->curl = curl_easy_duphandle(curl_default);
687 #endif
688 curl_session_count++;
689 }
690
691 active_requests++;
692 slot->in_use = 1;
693 slot->results = NULL;
694 slot->finished = NULL;
695 slot->callback_data = NULL;
696 slot->callback_func = NULL;
697 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
698 if (curl_save_cookies)
699 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
700 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
701 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
702 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
703 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
704 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
705 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
706 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
707 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
708 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
709 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
710 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
711 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
712 #endif
713 if (http_auth.password)
714 init_curl_http_auth(slot->curl);
715
716 return slot;
717 }
718
719 int start_active_slot(struct active_request_slot *slot)
720 {
721 #ifdef USE_CURL_MULTI
722 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
723 int num_transfers;
724
725 if (curlm_result != CURLM_OK &&
726 curlm_result != CURLM_CALL_MULTI_PERFORM) {
727 active_requests--;
728 slot->in_use = 0;
729 return 0;
730 }
731
732 /*
733 * We know there must be something to do, since we just added
734 * something.
735 */
736 curl_multi_perform(curlm, &num_transfers);
737 #endif
738 return 1;
739 }
740
741 #ifdef USE_CURL_MULTI
742 struct fill_chain {
743 void *data;
744 int (*fill)(void *);
745 struct fill_chain *next;
746 };
747
748 static struct fill_chain *fill_cfg;
749
750 void add_fill_function(void *data, int (*fill)(void *))
751 {
752 struct fill_chain *new = xmalloc(sizeof(*new));
753 struct fill_chain **linkp = &fill_cfg;
754 new->data = data;
755 new->fill = fill;
756 new->next = NULL;
757 while (*linkp)
758 linkp = &(*linkp)->next;
759 *linkp = new;
760 }
761
762 void fill_active_slots(void)
763 {
764 struct active_request_slot *slot = active_queue_head;
765
766 while (active_requests < max_requests) {
767 struct fill_chain *fill;
768 for (fill = fill_cfg; fill; fill = fill->next)
769 if (fill->fill(fill->data))
770 break;
771
772 if (!fill)
773 break;
774 }
775
776 while (slot != NULL) {
777 if (!slot->in_use && slot->curl != NULL
778 && curl_session_count > min_curl_sessions) {
779 curl_easy_cleanup(slot->curl);
780 slot->curl = NULL;
781 curl_session_count--;
782 }
783 slot = slot->next;
784 }
785 }
786
787 void step_active_slots(void)
788 {
789 int num_transfers;
790 CURLMcode curlm_result;
791
792 do {
793 curlm_result = curl_multi_perform(curlm, &num_transfers);
794 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
795 if (num_transfers < active_requests) {
796 process_curl_messages();
797 fill_active_slots();
798 }
799 }
800 #endif
801
802 void run_active_slot(struct active_request_slot *slot)
803 {
804 #ifdef USE_CURL_MULTI
805 fd_set readfds;
806 fd_set writefds;
807 fd_set excfds;
808 int max_fd;
809 struct timeval select_timeout;
810 int finished = 0;
811
812 slot->finished = &finished;
813 while (!finished) {
814 step_active_slots();
815
816 if (slot->in_use) {
817 #if LIBCURL_VERSION_NUM >= 0x070f04
818 long curl_timeout;
819 curl_multi_timeout(curlm, &curl_timeout);
820 if (curl_timeout == 0) {
821 continue;
822 } else if (curl_timeout == -1) {
823 select_timeout.tv_sec = 0;
824 select_timeout.tv_usec = 50000;
825 } else {
826 select_timeout.tv_sec = curl_timeout / 1000;
827 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
828 }
829 #else
830 select_timeout.tv_sec = 0;
831 select_timeout.tv_usec = 50000;
832 #endif
833
834 max_fd = -1;
835 FD_ZERO(&readfds);
836 FD_ZERO(&writefds);
837 FD_ZERO(&excfds);
838 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
839
840 /*
841 * It can happen that curl_multi_timeout returns a pathologically
842 * long timeout when curl_multi_fdset returns no file descriptors
843 * to read. See commit message for more details.
844 */
845 if (max_fd < 0 &&
846 (select_timeout.tv_sec > 0 ||
847 select_timeout.tv_usec > 50000)) {
848 select_timeout.tv_sec = 0;
849 select_timeout.tv_usec = 50000;
850 }
851
852 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
853 }
854 }
855 #else
856 while (slot->in_use) {
857 slot->curl_result = curl_easy_perform(slot->curl);
858 finish_active_slot(slot);
859 }
860 #endif
861 }
862
863 static void release_active_slot(struct active_request_slot *slot)
864 {
865 closedown_active_slot(slot);
866 if (slot->curl && curl_session_count > min_curl_sessions) {
867 #ifdef USE_CURL_MULTI
868 curl_multi_remove_handle(curlm, slot->curl);
869 #endif
870 curl_easy_cleanup(slot->curl);
871 slot->curl = NULL;
872 curl_session_count--;
873 }
874 #ifdef USE_CURL_MULTI
875 fill_active_slots();
876 #endif
877 }
878
879 void finish_all_active_slots(void)
880 {
881 struct active_request_slot *slot = active_queue_head;
882
883 while (slot != NULL)
884 if (slot->in_use) {
885 run_active_slot(slot);
886 slot = active_queue_head;
887 } else {
888 slot = slot->next;
889 }
890 }
891
892 /* Helpers for modifying and creating URLs */
893 static inline int needs_quote(int ch)
894 {
895 if (((ch >= 'A') && (ch <= 'Z'))
896 || ((ch >= 'a') && (ch <= 'z'))
897 || ((ch >= '0') && (ch <= '9'))
898 || (ch == '/')
899 || (ch == '-')
900 || (ch == '.'))
901 return 0;
902 return 1;
903 }
904
905 static char *quote_ref_url(const char *base, const char *ref)
906 {
907 struct strbuf buf = STRBUF_INIT;
908 const char *cp;
909 int ch;
910
911 end_url_with_slash(&buf, base);
912
913 for (cp = ref; (ch = *cp) != 0; cp++)
914 if (needs_quote(ch))
915 strbuf_addf(&buf, "%%%02x", ch);
916 else
917 strbuf_addch(&buf, *cp);
918
919 return strbuf_detach(&buf, NULL);
920 }
921
922 void append_remote_object_url(struct strbuf *buf, const char *url,
923 const char *hex,
924 int only_two_digit_prefix)
925 {
926 end_url_with_slash(buf, url);
927
928 strbuf_addf(buf, "objects/%.*s/", 2, hex);
929 if (!only_two_digit_prefix)
930 strbuf_addf(buf, "%s", hex+2);
931 }
932
933 char *get_remote_object_url(const char *url, const char *hex,
934 int only_two_digit_prefix)
935 {
936 struct strbuf buf = STRBUF_INIT;
937 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
938 return strbuf_detach(&buf, NULL);
939 }
940
941 static int handle_curl_result(struct slot_results *results)
942 {
943 /*
944 * If we see a failing http code with CURLE_OK, we have turned off
945 * FAILONERROR (to keep the server's custom error response), and should
946 * translate the code into failure here.
947 */
948 if (results->curl_result == CURLE_OK &&
949 results->http_code >= 400) {
950 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
951 /*
952 * Normally curl will already have put the "reason phrase"
953 * from the server into curl_errorstr; unfortunately without
954 * FAILONERROR it is lost, so we can give only the numeric
955 * status code.
956 */
957 snprintf(curl_errorstr, sizeof(curl_errorstr),
958 "The requested URL returned error: %ld",
959 results->http_code);
960 }
961
962 if (results->curl_result == CURLE_OK) {
963 credential_approve(&http_auth);
964 return HTTP_OK;
965 } else if (missing_target(results))
966 return HTTP_MISSING_TARGET;
967 else if (results->http_code == 401) {
968 if (http_auth.username && http_auth.password) {
969 credential_reject(&http_auth);
970 return HTTP_NOAUTH;
971 } else {
972 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
973 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
974 #endif
975 return HTTP_REAUTH;
976 }
977 } else {
978 #if LIBCURL_VERSION_NUM >= 0x070c00
979 if (!curl_errorstr[0])
980 strlcpy(curl_errorstr,
981 curl_easy_strerror(results->curl_result),
982 sizeof(curl_errorstr));
983 #endif
984 return HTTP_ERROR;
985 }
986 }
987
988 int run_one_slot(struct active_request_slot *slot,
989 struct slot_results *results)
990 {
991 slot->results = results;
992 if (!start_active_slot(slot)) {
993 snprintf(curl_errorstr, sizeof(curl_errorstr),
994 "failed to start HTTP request");
995 return HTTP_START_FAILED;
996 }
997
998 run_active_slot(slot);
999 return handle_curl_result(results);
1000 }
1001
1002 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1003 {
1004 char *ptr;
1005 CURLcode ret;
1006
1007 strbuf_reset(buf);
1008 ret = curl_easy_getinfo(curl, info, &ptr);
1009 if (!ret && ptr)
1010 strbuf_addstr(buf, ptr);
1011 return ret;
1012 }
1013
1014 /*
1015 * Check for and extract a content-type parameter. "raw"
1016 * should be positioned at the start of the potential
1017 * parameter, with any whitespace already removed.
1018 *
1019 * "name" is the name of the parameter. The value is appended
1020 * to "out".
1021 */
1022 static int extract_param(const char *raw, const char *name,
1023 struct strbuf *out)
1024 {
1025 size_t len = strlen(name);
1026
1027 if (strncasecmp(raw, name, len))
1028 return -1;
1029 raw += len;
1030
1031 if (*raw != '=')
1032 return -1;
1033 raw++;
1034
1035 while (*raw && !isspace(*raw) && *raw != ';')
1036 strbuf_addch(out, *raw++);
1037 return 0;
1038 }
1039
1040 /*
1041 * Extract a normalized version of the content type, with any
1042 * spaces suppressed, all letters lowercased, and no trailing ";"
1043 * or parameters.
1044 *
1045 * Note that we will silently remove even invalid whitespace. For
1046 * example, "text / plain" is specifically forbidden by RFC 2616,
1047 * but "text/plain" is the only reasonable output, and this keeps
1048 * our code simple.
1049 *
1050 * If the "charset" argument is not NULL, store the value of any
1051 * charset parameter there.
1052 *
1053 * Example:
1054 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1055 * "text / plain" -> "text/plain"
1056 */
1057 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1058 struct strbuf *charset)
1059 {
1060 const char *p;
1061
1062 strbuf_reset(type);
1063 strbuf_grow(type, raw->len);
1064 for (p = raw->buf; *p; p++) {
1065 if (isspace(*p))
1066 continue;
1067 if (*p == ';') {
1068 p++;
1069 break;
1070 }
1071 strbuf_addch(type, tolower(*p));
1072 }
1073
1074 if (!charset)
1075 return;
1076
1077 strbuf_reset(charset);
1078 while (*p) {
1079 while (isspace(*p) || *p == ';')
1080 p++;
1081 if (!extract_param(p, "charset", charset))
1082 return;
1083 while (*p && !isspace(*p))
1084 p++;
1085 }
1086
1087 if (!charset->len && starts_with(type->buf, "text/"))
1088 strbuf_addstr(charset, "ISO-8859-1");
1089 }
1090
1091 static void write_accept_language(struct strbuf *buf)
1092 {
1093 /*
1094 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1095 * that, q-value will be smaller than 0.001, the minimum q-value the
1096 * HTTP specification allows. See
1097 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1098 */
1099 const int MAX_DECIMAL_PLACES = 3;
1100 const int MAX_LANGUAGE_TAGS = 1000;
1101 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1102 char **language_tags = NULL;
1103 int num_langs = 0;
1104 const char *s = get_preferred_languages();
1105 int i;
1106 struct strbuf tag = STRBUF_INIT;
1107
1108 /* Don't add Accept-Language header if no language is preferred. */
1109 if (!s)
1110 return;
1111
1112 /*
1113 * Split the colon-separated string of preferred languages into
1114 * language_tags array.
1115 */
1116 do {
1117 /* collect language tag */
1118 for (; *s && (isalnum(*s) || *s == '_'); s++)
1119 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1120
1121 /* skip .codeset, @modifier and any other unnecessary parts */
1122 while (*s && *s != ':')
1123 s++;
1124
1125 if (tag.len) {
1126 num_langs++;
1127 REALLOC_ARRAY(language_tags, num_langs);
1128 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1129 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1130 break;
1131 }
1132 } while (*s++);
1133
1134 /* write Accept-Language header into buf */
1135 if (num_langs) {
1136 int last_buf_len = 0;
1137 int max_q;
1138 int decimal_places;
1139 char q_format[32];
1140
1141 /* add '*' */
1142 REALLOC_ARRAY(language_tags, num_langs + 1);
1143 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1144
1145 /* compute decimal_places */
1146 for (max_q = 1, decimal_places = 0;
1147 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1148 decimal_places++, max_q *= 10)
1149 ;
1150
1151 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1152
1153 strbuf_addstr(buf, "Accept-Language: ");
1154
1155 for (i = 0; i < num_langs; i++) {
1156 if (i > 0)
1157 strbuf_addstr(buf, ", ");
1158
1159 strbuf_addstr(buf, language_tags[i]);
1160
1161 if (i > 0)
1162 strbuf_addf(buf, q_format, max_q - i);
1163
1164 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1165 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1166 break;
1167 }
1168
1169 last_buf_len = buf->len;
1170 }
1171 }
1172
1173 /* free language tags -- last one is a static '*' */
1174 for (i = 0; i < num_langs - 1; i++)
1175 free(language_tags[i]);
1176 free(language_tags);
1177 }
1178
1179 /*
1180 * Get an Accept-Language header which indicates user's preferred languages.
1181 *
1182 * Examples:
1183 * LANGUAGE= -> ""
1184 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1185 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1186 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1187 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1188 * LANGUAGE= LANG=C -> ""
1189 */
1190 static const char *get_accept_language(void)
1191 {
1192 if (!cached_accept_language) {
1193 struct strbuf buf = STRBUF_INIT;
1194 write_accept_language(&buf);
1195 if (buf.len > 0)
1196 cached_accept_language = strbuf_detach(&buf, NULL);
1197 }
1198
1199 return cached_accept_language;
1200 }
1201
1202 static void http_opt_request_remainder(CURL *curl, off_t pos)
1203 {
1204 char buf[128];
1205 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1206 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1207 }
1208
1209 /* http_request() targets */
1210 #define HTTP_REQUEST_STRBUF 0
1211 #define HTTP_REQUEST_FILE 1
1212
1213 static int http_request(const char *url,
1214 void *result, int target,
1215 const struct http_get_options *options)
1216 {
1217 struct active_request_slot *slot;
1218 struct slot_results results;
1219 struct curl_slist *headers = NULL;
1220 struct strbuf buf = STRBUF_INIT;
1221 const char *accept_language;
1222 int ret;
1223
1224 slot = get_active_slot();
1225 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1226
1227 if (result == NULL) {
1228 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1229 } else {
1230 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1231 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1232
1233 if (target == HTTP_REQUEST_FILE) {
1234 off_t posn = ftello(result);
1235 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1236 fwrite);
1237 if (posn > 0)
1238 http_opt_request_remainder(slot->curl, posn);
1239 } else
1240 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1241 fwrite_buffer);
1242 }
1243
1244 accept_language = get_accept_language();
1245
1246 if (accept_language)
1247 headers = curl_slist_append(headers, accept_language);
1248
1249 strbuf_addstr(&buf, "Pragma:");
1250 if (options && options->no_cache)
1251 strbuf_addstr(&buf, " no-cache");
1252 if (options && options->keep_error)
1253 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1254
1255 headers = curl_slist_append(headers, buf.buf);
1256
1257 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1258 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1259 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1260
1261 ret = run_one_slot(slot, &results);
1262
1263 if (options && options->content_type) {
1264 struct strbuf raw = STRBUF_INIT;
1265 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1266 extract_content_type(&raw, options->content_type,
1267 options->charset);
1268 strbuf_release(&raw);
1269 }
1270
1271 if (options && options->effective_url)
1272 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1273 options->effective_url);
1274
1275 curl_slist_free_all(headers);
1276 strbuf_release(&buf);
1277
1278 return ret;
1279 }
1280
1281 /*
1282 * Update the "base" url to a more appropriate value, as deduced by
1283 * redirects seen when requesting a URL starting with "url".
1284 *
1285 * The "asked" parameter is a URL that we asked curl to access, and must begin
1286 * with "base".
1287 *
1288 * The "got" parameter is the URL that curl reported to us as where we ended
1289 * up.
1290 *
1291 * Returns 1 if we updated the base url, 0 otherwise.
1292 *
1293 * Our basic strategy is to compare "base" and "asked" to find the bits
1294 * specific to our request. We then strip those bits off of "got" to yield the
1295 * new base. So for example, if our base is "http://example.com/foo.git",
1296 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1297 * with "https://other.example.com/foo.git/info/refs". We would want the
1298 * new URL to become "https://other.example.com/foo.git".
1299 *
1300 * Note that this assumes a sane redirect scheme. It's entirely possible
1301 * in the example above to end up at a URL that does not even end in
1302 * "info/refs". In such a case we simply punt, as there is not much we can
1303 * do (and such a scheme is unlikely to represent a real git repository,
1304 * which means we are likely about to abort anyway).
1305 */
1306 static int update_url_from_redirect(struct strbuf *base,
1307 const char *asked,
1308 const struct strbuf *got)
1309 {
1310 const char *tail;
1311 size_t tail_len;
1312
1313 if (!strcmp(asked, got->buf))
1314 return 0;
1315
1316 if (!skip_prefix(asked, base->buf, &tail))
1317 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1318 asked, base->buf);
1319
1320 tail_len = strlen(tail);
1321
1322 if (got->len < tail_len ||
1323 strcmp(tail, got->buf + got->len - tail_len))
1324 return 0; /* insane redirect scheme */
1325
1326 strbuf_reset(base);
1327 strbuf_add(base, got->buf, got->len - tail_len);
1328 return 1;
1329 }
1330
1331 static int http_request_reauth(const char *url,
1332 void *result, int target,
1333 struct http_get_options *options)
1334 {
1335 int ret = http_request(url, result, target, options);
1336
1337 if (options && options->effective_url && options->base_url) {
1338 if (update_url_from_redirect(options->base_url,
1339 url, options->effective_url)) {
1340 credential_from_url(&http_auth, options->base_url->buf);
1341 url = options->effective_url->buf;
1342 }
1343 }
1344
1345 if (ret != HTTP_REAUTH)
1346 return ret;
1347
1348 /*
1349 * If we are using KEEP_ERROR, the previous request may have
1350 * put cruft into our output stream; we should clear it out before
1351 * making our next request. We only know how to do this for
1352 * the strbuf case, but that is enough to satisfy current callers.
1353 */
1354 if (options && options->keep_error) {
1355 switch (target) {
1356 case HTTP_REQUEST_STRBUF:
1357 strbuf_reset(result);
1358 break;
1359 default:
1360 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1361 }
1362 }
1363
1364 credential_fill(&http_auth);
1365
1366 return http_request(url, result, target, options);
1367 }
1368
1369 int http_get_strbuf(const char *url,
1370 struct strbuf *result,
1371 struct http_get_options *options)
1372 {
1373 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1374 }
1375
1376 /*
1377 * Downloads a URL and stores the result in the given file.
1378 *
1379 * If a previous interrupted download is detected (i.e. a previous temporary
1380 * file is still around) the download is resumed.
1381 */
1382 static int http_get_file(const char *url, const char *filename,
1383 struct http_get_options *options)
1384 {
1385 int ret;
1386 struct strbuf tmpfile = STRBUF_INIT;
1387 FILE *result;
1388
1389 strbuf_addf(&tmpfile, "%s.temp", filename);
1390 result = fopen(tmpfile.buf, "a");
1391 if (!result) {
1392 error("Unable to open local file %s", tmpfile.buf);
1393 ret = HTTP_ERROR;
1394 goto cleanup;
1395 }
1396
1397 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1398 fclose(result);
1399
1400 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1401 ret = HTTP_ERROR;
1402 cleanup:
1403 strbuf_release(&tmpfile);
1404 return ret;
1405 }
1406
1407 int http_fetch_ref(const char *base, struct ref *ref)
1408 {
1409 struct http_get_options options = {0};
1410 char *url;
1411 struct strbuf buffer = STRBUF_INIT;
1412 int ret = -1;
1413
1414 options.no_cache = 1;
1415
1416 url = quote_ref_url(base, ref->name);
1417 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1418 strbuf_rtrim(&buffer);
1419 if (buffer.len == 40)
1420 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1421 else if (starts_with(buffer.buf, "ref: ")) {
1422 ref->symref = xstrdup(buffer.buf + 5);
1423 ret = 0;
1424 }
1425 }
1426
1427 strbuf_release(&buffer);
1428 free(url);
1429 return ret;
1430 }
1431
1432 /* Helpers for fetching packs */
1433 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1434 {
1435 char *url, *tmp;
1436 struct strbuf buf = STRBUF_INIT;
1437
1438 if (http_is_verbose)
1439 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1440
1441 end_url_with_slash(&buf, base_url);
1442 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1443 url = strbuf_detach(&buf, NULL);
1444
1445 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1446 tmp = strbuf_detach(&buf, NULL);
1447
1448 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1449 error("Unable to get pack index %s", url);
1450 free(tmp);
1451 tmp = NULL;
1452 }
1453
1454 free(url);
1455 return tmp;
1456 }
1457
1458 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1459 unsigned char *sha1, const char *base_url)
1460 {
1461 struct packed_git *new_pack;
1462 char *tmp_idx = NULL;
1463 int ret;
1464
1465 if (has_pack_index(sha1)) {
1466 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1467 if (!new_pack)
1468 return -1; /* parse_pack_index() already issued error message */
1469 goto add_pack;
1470 }
1471
1472 tmp_idx = fetch_pack_index(sha1, base_url);
1473 if (!tmp_idx)
1474 return -1;
1475
1476 new_pack = parse_pack_index(sha1, tmp_idx);
1477 if (!new_pack) {
1478 unlink(tmp_idx);
1479 free(tmp_idx);
1480
1481 return -1; /* parse_pack_index() already issued error message */
1482 }
1483
1484 ret = verify_pack_index(new_pack);
1485 if (!ret) {
1486 close_pack_index(new_pack);
1487 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1488 }
1489 free(tmp_idx);
1490 if (ret)
1491 return -1;
1492
1493 add_pack:
1494 new_pack->next = *packs_head;
1495 *packs_head = new_pack;
1496 return 0;
1497 }
1498
1499 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1500 {
1501 struct http_get_options options = {0};
1502 int ret = 0, i = 0;
1503 char *url, *data;
1504 struct strbuf buf = STRBUF_INIT;
1505 unsigned char sha1[20];
1506
1507 end_url_with_slash(&buf, base_url);
1508 strbuf_addstr(&buf, "objects/info/packs");
1509 url = strbuf_detach(&buf, NULL);
1510
1511 options.no_cache = 1;
1512 ret = http_get_strbuf(url, &buf, &options);
1513 if (ret != HTTP_OK)
1514 goto cleanup;
1515
1516 data = buf.buf;
1517 while (i < buf.len) {
1518 switch (data[i]) {
1519 case 'P':
1520 i++;
1521 if (i + 52 <= buf.len &&
1522 starts_with(data + i, " pack-") &&
1523 starts_with(data + i + 46, ".pack\n")) {
1524 get_sha1_hex(data + i + 6, sha1);
1525 fetch_and_setup_pack_index(packs_head, sha1,
1526 base_url);
1527 i += 51;
1528 break;
1529 }
1530 default:
1531 while (i < buf.len && data[i] != '\n')
1532 i++;
1533 }
1534 i++;
1535 }
1536
1537 cleanup:
1538 free(url);
1539 return ret;
1540 }
1541
1542 void release_http_pack_request(struct http_pack_request *preq)
1543 {
1544 if (preq->packfile != NULL) {
1545 fclose(preq->packfile);
1546 preq->packfile = NULL;
1547 }
1548 preq->slot = NULL;
1549 free(preq->url);
1550 free(preq);
1551 }
1552
1553 int finish_http_pack_request(struct http_pack_request *preq)
1554 {
1555 struct packed_git **lst;
1556 struct packed_git *p = preq->target;
1557 char *tmp_idx;
1558 size_t len;
1559 struct child_process ip = CHILD_PROCESS_INIT;
1560 const char *ip_argv[8];
1561
1562 close_pack_index(p);
1563
1564 fclose(preq->packfile);
1565 preq->packfile = NULL;
1566
1567 lst = preq->lst;
1568 while (*lst != p)
1569 lst = &((*lst)->next);
1570 *lst = (*lst)->next;
1571
1572 if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1573 die("BUG: pack tmpfile does not end in .pack.temp?");
1574 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1575
1576 ip_argv[0] = "index-pack";
1577 ip_argv[1] = "-o";
1578 ip_argv[2] = tmp_idx;
1579 ip_argv[3] = preq->tmpfile;
1580 ip_argv[4] = NULL;
1581
1582 ip.argv = ip_argv;
1583 ip.git_cmd = 1;
1584 ip.no_stdin = 1;
1585 ip.no_stdout = 1;
1586
1587 if (run_command(&ip)) {
1588 unlink(preq->tmpfile);
1589 unlink(tmp_idx);
1590 free(tmp_idx);
1591 return -1;
1592 }
1593
1594 unlink(sha1_pack_index_name(p->sha1));
1595
1596 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1597 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1598 free(tmp_idx);
1599 return -1;
1600 }
1601
1602 install_packed_git(p);
1603 free(tmp_idx);
1604 return 0;
1605 }
1606
1607 struct http_pack_request *new_http_pack_request(
1608 struct packed_git *target, const char *base_url)
1609 {
1610 off_t prev_posn = 0;
1611 struct strbuf buf = STRBUF_INIT;
1612 struct http_pack_request *preq;
1613
1614 preq = xcalloc(1, sizeof(*preq));
1615 preq->target = target;
1616
1617 end_url_with_slash(&buf, base_url);
1618 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1619 sha1_to_hex(target->sha1));
1620 preq->url = strbuf_detach(&buf, NULL);
1621
1622 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1623 sha1_pack_name(target->sha1));
1624 preq->packfile = fopen(preq->tmpfile, "a");
1625 if (!preq->packfile) {
1626 error("Unable to open local file %s for pack",
1627 preq->tmpfile);
1628 goto abort;
1629 }
1630
1631 preq->slot = get_active_slot();
1632 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1633 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1634 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1635 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1636 no_pragma_header);
1637
1638 /*
1639 * If there is data present from a previous transfer attempt,
1640 * resume where it left off
1641 */
1642 prev_posn = ftello(preq->packfile);
1643 if (prev_posn>0) {
1644 if (http_is_verbose)
1645 fprintf(stderr,
1646 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
1647 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
1648 http_opt_request_remainder(preq->slot->curl, prev_posn);
1649 }
1650
1651 return preq;
1652
1653 abort:
1654 free(preq->url);
1655 free(preq);
1656 return NULL;
1657 }
1658
1659 /* Helpers for fetching objects (loose) */
1660 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1661 void *data)
1662 {
1663 unsigned char expn[4096];
1664 size_t size = eltsize * nmemb;
1665 int posn = 0;
1666 struct http_object_request *freq =
1667 (struct http_object_request *)data;
1668 do {
1669 ssize_t retval = xwrite(freq->localfile,
1670 (char *) ptr + posn, size - posn);
1671 if (retval < 0)
1672 return posn;
1673 posn += retval;
1674 } while (posn < size);
1675
1676 freq->stream.avail_in = size;
1677 freq->stream.next_in = (void *)ptr;
1678 do {
1679 freq->stream.next_out = expn;
1680 freq->stream.avail_out = sizeof(expn);
1681 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1682 git_SHA1_Update(&freq->c, expn,
1683 sizeof(expn) - freq->stream.avail_out);
1684 } while (freq->stream.avail_in && freq->zret == Z_OK);
1685 return size;
1686 }
1687
1688 struct http_object_request *new_http_object_request(const char *base_url,
1689 unsigned char *sha1)
1690 {
1691 char *hex = sha1_to_hex(sha1);
1692 const char *filename;
1693 char prevfile[PATH_MAX];
1694 int prevlocal;
1695 char prev_buf[PREV_BUF_SIZE];
1696 ssize_t prev_read = 0;
1697 off_t prev_posn = 0;
1698 struct http_object_request *freq;
1699
1700 freq = xcalloc(1, sizeof(*freq));
1701 hashcpy(freq->sha1, sha1);
1702 freq->localfile = -1;
1703
1704 filename = sha1_file_name(sha1);
1705 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1706 "%s.temp", filename);
1707
1708 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1709 unlink_or_warn(prevfile);
1710 rename(freq->tmpfile, prevfile);
1711 unlink_or_warn(freq->tmpfile);
1712
1713 if (freq->localfile != -1)
1714 error("fd leakage in start: %d", freq->localfile);
1715 freq->localfile = open(freq->tmpfile,
1716 O_WRONLY | O_CREAT | O_EXCL, 0666);
1717 /*
1718 * This could have failed due to the "lazy directory creation";
1719 * try to mkdir the last path component.
1720 */
1721 if (freq->localfile < 0 && errno == ENOENT) {
1722 char *dir = strrchr(freq->tmpfile, '/');
1723 if (dir) {
1724 *dir = 0;
1725 mkdir(freq->tmpfile, 0777);
1726 *dir = '/';
1727 }
1728 freq->localfile = open(freq->tmpfile,
1729 O_WRONLY | O_CREAT | O_EXCL, 0666);
1730 }
1731
1732 if (freq->localfile < 0) {
1733 error("Couldn't create temporary file %s: %s",
1734 freq->tmpfile, strerror(errno));
1735 goto abort;
1736 }
1737
1738 git_inflate_init(&freq->stream);
1739
1740 git_SHA1_Init(&freq->c);
1741
1742 freq->url = get_remote_object_url(base_url, hex, 0);
1743
1744 /*
1745 * If a previous temp file is present, process what was already
1746 * fetched.
1747 */
1748 prevlocal = open(prevfile, O_RDONLY);
1749 if (prevlocal != -1) {
1750 do {
1751 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1752 if (prev_read>0) {
1753 if (fwrite_sha1_file(prev_buf,
1754 1,
1755 prev_read,
1756 freq) == prev_read) {
1757 prev_posn += prev_read;
1758 } else {
1759 prev_read = -1;
1760 }
1761 }
1762 } while (prev_read > 0);
1763 close(prevlocal);
1764 }
1765 unlink_or_warn(prevfile);
1766
1767 /*
1768 * Reset inflate/SHA1 if there was an error reading the previous temp
1769 * file; also rewind to the beginning of the local file.
1770 */
1771 if (prev_read == -1) {
1772 memset(&freq->stream, 0, sizeof(freq->stream));
1773 git_inflate_init(&freq->stream);
1774 git_SHA1_Init(&freq->c);
1775 if (prev_posn>0) {
1776 prev_posn = 0;
1777 lseek(freq->localfile, 0, SEEK_SET);
1778 if (ftruncate(freq->localfile, 0) < 0) {
1779 error("Couldn't truncate temporary file %s: %s",
1780 freq->tmpfile, strerror(errno));
1781 goto abort;
1782 }
1783 }
1784 }
1785
1786 freq->slot = get_active_slot();
1787
1788 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1789 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1790 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1791 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1792 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1793
1794 /*
1795 * If we have successfully processed data from a previous fetch
1796 * attempt, only fetch the data we don't already have.
1797 */
1798 if (prev_posn>0) {
1799 if (http_is_verbose)
1800 fprintf(stderr,
1801 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
1802 hex, (uintmax_t)prev_posn);
1803 http_opt_request_remainder(freq->slot->curl, prev_posn);
1804 }
1805
1806 return freq;
1807
1808 abort:
1809 free(freq->url);
1810 free(freq);
1811 return NULL;
1812 }
1813
1814 void process_http_object_request(struct http_object_request *freq)
1815 {
1816 if (freq->slot == NULL)
1817 return;
1818 freq->curl_result = freq->slot->curl_result;
1819 freq->http_code = freq->slot->http_code;
1820 freq->slot = NULL;
1821 }
1822
1823 int finish_http_object_request(struct http_object_request *freq)
1824 {
1825 struct stat st;
1826
1827 close(freq->localfile);
1828 freq->localfile = -1;
1829
1830 process_http_object_request(freq);
1831
1832 if (freq->http_code == 416) {
1833 warning("requested range invalid; we may already have all the data.");
1834 } else if (freq->curl_result != CURLE_OK) {
1835 if (stat(freq->tmpfile, &st) == 0)
1836 if (st.st_size == 0)
1837 unlink_or_warn(freq->tmpfile);
1838 return -1;
1839 }
1840
1841 git_inflate_end(&freq->stream);
1842 git_SHA1_Final(freq->real_sha1, &freq->c);
1843 if (freq->zret != Z_STREAM_END) {
1844 unlink_or_warn(freq->tmpfile);
1845 return -1;
1846 }
1847 if (hashcmp(freq->sha1, freq->real_sha1)) {
1848 unlink_or_warn(freq->tmpfile);
1849 return -1;
1850 }
1851 freq->rename =
1852 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
1853
1854 return freq->rename;
1855 }
1856
1857 void abort_http_object_request(struct http_object_request *freq)
1858 {
1859 unlink_or_warn(freq->tmpfile);
1860
1861 release_http_object_request(freq);
1862 }
1863
1864 void release_http_object_request(struct http_object_request *freq)
1865 {
1866 if (freq->localfile != -1) {
1867 close(freq->localfile);
1868 freq->localfile = -1;
1869 }
1870 if (freq->url != NULL) {
1871 free(freq->url);
1872 freq->url = NULL;
1873 }
1874 if (freq->slot != NULL) {
1875 freq->slot->callback_func = NULL;
1876 freq->slot->callback_data = NULL;
1877 release_active_slot(freq->slot);
1878 freq->slot = NULL;
1879 }
1880 }
git for Debian