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http: differentiate socks5:// and socks5h://
[git.git] / http.c
blobb560c133cfd55b5f3fd4a9fbd2714c540cc70863
1 #include "git-compat-util.h"
2 #include "http.h"
3 #include "pack.h"
4 #include "sideband.h"
5 #include "run-command.h"
6 #include "url.h"
7 #include "urlmatch.h"
8 #include "credential.h"
9 #include "version.h"
10 #include "pkt-line.h"
11 #include "gettext.h"
12 #include "transport.h"
13
14 int active_requests;
15 int http_is_verbose;
16 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
17
18 #if LIBCURL_VERSION_NUM >= 0x070a06
19 #define LIBCURL_CAN_HANDLE_AUTH_ANY
20 #endif
21
22 static int min_curl_sessions = 1;
23 static int curl_session_count;
24 #ifdef USE_CURL_MULTI
25 static int max_requests = -1;
26 static CURLM *curlm;
27 #endif
28 #ifndef NO_CURL_EASY_DUPHANDLE
29 static CURL *curl_default;
30 #endif
31
32 #define PREV_BUF_SIZE 4096
33 #define RANGE_HEADER_SIZE 30
34
35 char curl_errorstr[CURL_ERROR_SIZE];
36
37 static int curl_ssl_verify = -1;
38 static int curl_ssl_try;
39 static const char *ssl_cert;
40 static const char *ssl_cipherlist;
41 static const char *ssl_version;
42 static struct {
43 const char *name;
44 long ssl_version;
45 } sslversions[] = {
46 { "sslv2", CURL_SSLVERSION_SSLv2 },
47 { "sslv3", CURL_SSLVERSION_SSLv3 },
48 { "tlsv1", CURL_SSLVERSION_TLSv1 },
49 #if LIBCURL_VERSION_NUM >= 0x072200
50 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
51 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
52 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
53 #endif
54 };
55 #if LIBCURL_VERSION_NUM >= 0x070903
56 static const char *ssl_key;
57 #endif
58 #if LIBCURL_VERSION_NUM >= 0x070908
59 static const char *ssl_capath;
60 #endif
61 static const char *ssl_cainfo;
62 static long curl_low_speed_limit = -1;
63 static long curl_low_speed_time = -1;
64 static int curl_ftp_no_epsv;
65 static const char *curl_http_proxy;
66 static const char *curl_cookie_file;
67 static int curl_save_cookies;
68 struct credential http_auth = CREDENTIAL_INIT;
69 static int http_proactive_auth;
70 static const char *user_agent;
71
72 #if LIBCURL_VERSION_NUM >= 0x071700
73 /* Use CURLOPT_KEYPASSWD as is */
74 #elif LIBCURL_VERSION_NUM >= 0x070903
75 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
76 #else
77 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
78 #endif
79
80 static struct credential cert_auth = CREDENTIAL_INIT;
81 static int ssl_cert_password_required;
82 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
83 static unsigned long http_auth_methods = CURLAUTH_ANY;
84 #endif
85
86 static struct curl_slist *pragma_header;
87 static struct curl_slist *no_pragma_header;
88
89 static struct active_request_slot *active_queue_head;
90
91 static char *cached_accept_language;
92
93 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
94 {
95 size_t size = eltsize * nmemb;
96 struct buffer *buffer = buffer_;
97
98 if (size > buffer->buf.len - buffer->posn)
99 size = buffer->buf.len - buffer->posn;
100 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
101 buffer->posn += size;
102
103 return size;
104 }
105
106 #ifndef NO_CURL_IOCTL
107 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
108 {
109 struct buffer *buffer = clientp;
110
111 switch (cmd) {
112 case CURLIOCMD_NOP:
113 return CURLIOE_OK;
114
115 case CURLIOCMD_RESTARTREAD:
116 buffer->posn = 0;
117 return CURLIOE_OK;
118
119 default:
120 return CURLIOE_UNKNOWNCMD;
121 }
122 }
123 #endif
124
125 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
126 {
127 size_t size = eltsize * nmemb;
128 struct strbuf *buffer = buffer_;
129
130 strbuf_add(buffer, ptr, size);
131 return size;
132 }
133
134 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
135 {
136 return eltsize * nmemb;
137 }
138
139 static void closedown_active_slot(struct active_request_slot *slot)
140 {
141 active_requests--;
142 slot->in_use = 0;
143 }
144
145 static void finish_active_slot(struct active_request_slot *slot)
146 {
147 closedown_active_slot(slot);
148 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
149
150 if (slot->finished != NULL)
151 (*slot->finished) = 1;
152
153 /* Store slot results so they can be read after the slot is reused */
154 if (slot->results != NULL) {
155 slot->results->curl_result = slot->curl_result;
156 slot->results->http_code = slot->http_code;
157 #if LIBCURL_VERSION_NUM >= 0x070a08
158 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
159 &slot->results->auth_avail);
160 #else
161 slot->results->auth_avail = 0;
162 #endif
163 }
164
165 /* Run callback if appropriate */
166 if (slot->callback_func != NULL)
167 slot->callback_func(slot->callback_data);
168 }
169
170 #ifdef USE_CURL_MULTI
171 static void process_curl_messages(void)
172 {
173 int num_messages;
174 struct active_request_slot *slot;
175 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
176
177 while (curl_message != NULL) {
178 if (curl_message->msg == CURLMSG_DONE) {
179 int curl_result = curl_message->data.result;
180 slot = active_queue_head;
181 while (slot != NULL &&
182 slot->curl != curl_message->easy_handle)
183 slot = slot->next;
184 if (slot != NULL) {
185 curl_multi_remove_handle(curlm, slot->curl);
186 slot->curl_result = curl_result;
187 finish_active_slot(slot);
188 } else {
189 fprintf(stderr, "Received DONE message for unknown request!\n");
190 }
191 } else {
192 fprintf(stderr, "Unknown CURL message received: %d\n",
193 (int)curl_message->msg);
194 }
195 curl_message = curl_multi_info_read(curlm, &num_messages);
196 }
197 }
198 #endif
199
200 static int http_options(const char *var, const char *value, void *cb)
201 {
202 if (!strcmp("http.sslverify", var)) {
203 curl_ssl_verify = git_config_bool(var, value);
204 return 0;
205 }
206 if (!strcmp("http.sslcipherlist", var))
207 return git_config_string(&ssl_cipherlist, var, value);
208 if (!strcmp("http.sslversion", var))
209 return git_config_string(&ssl_version, var, value);
210 if (!strcmp("http.sslcert", var))
211 return git_config_string(&ssl_cert, var, value);
212 #if LIBCURL_VERSION_NUM >= 0x070903
213 if (!strcmp("http.sslkey", var))
214 return git_config_string(&ssl_key, var, value);
215 #endif
216 #if LIBCURL_VERSION_NUM >= 0x070908
217 if (!strcmp("http.sslcapath", var))
218 return git_config_pathname(&ssl_capath, var, value);
219 #endif
220 if (!strcmp("http.sslcainfo", var))
221 return git_config_pathname(&ssl_cainfo, var, value);
222 if (!strcmp("http.sslcertpasswordprotected", var)) {
223 ssl_cert_password_required = git_config_bool(var, value);
224 return 0;
225 }
226 if (!strcmp("http.ssltry", var)) {
227 curl_ssl_try = git_config_bool(var, value);
228 return 0;
229 }
230 if (!strcmp("http.minsessions", var)) {
231 min_curl_sessions = git_config_int(var, value);
232 #ifndef USE_CURL_MULTI
233 if (min_curl_sessions > 1)
234 min_curl_sessions = 1;
235 #endif
236 return 0;
237 }
238 #ifdef USE_CURL_MULTI
239 if (!strcmp("http.maxrequests", var)) {
240 max_requests = git_config_int(var, value);
241 return 0;
242 }
243 #endif
244 if (!strcmp("http.lowspeedlimit", var)) {
245 curl_low_speed_limit = (long)git_config_int(var, value);
246 return 0;
247 }
248 if (!strcmp("http.lowspeedtime", var)) {
249 curl_low_speed_time = (long)git_config_int(var, value);
250 return 0;
251 }
252
253 if (!strcmp("http.noepsv", var)) {
254 curl_ftp_no_epsv = git_config_bool(var, value);
255 return 0;
256 }
257 if (!strcmp("http.proxy", var))
258 return git_config_string(&curl_http_proxy, var, value);
259
260 if (!strcmp("http.cookiefile", var))
261 return git_config_string(&curl_cookie_file, var, value);
262 if (!strcmp("http.savecookies", var)) {
263 curl_save_cookies = git_config_bool(var, value);
264 return 0;
265 }
266
267 if (!strcmp("http.postbuffer", var)) {
268 http_post_buffer = git_config_int(var, value);
269 if (http_post_buffer < LARGE_PACKET_MAX)
270 http_post_buffer = LARGE_PACKET_MAX;
271 return 0;
272 }
273
274 if (!strcmp("http.useragent", var))
275 return git_config_string(&user_agent, var, value);
276
277 /* Fall back on the default ones */
278 return git_default_config(var, value, cb);
279 }
280
281 static void init_curl_http_auth(CURL *result)
282 {
283 if (!http_auth.username)
284 return;
285
286 credential_fill(&http_auth);
287
288 #if LIBCURL_VERSION_NUM >= 0x071301
289 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
290 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
291 #else
292 {
293 static struct strbuf up = STRBUF_INIT;
294 /*
295 * Note that we assume we only ever have a single set of
296 * credentials in a given program run, so we do not have
297 * to worry about updating this buffer, only setting its
298 * initial value.
299 */
300 if (!up.len)
301 strbuf_addf(&up, "%s:%s",
302 http_auth.username, http_auth.password);
303 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
304 }
305 #endif
306 }
307
308 static int has_cert_password(void)
309 {
310 if (ssl_cert == NULL || ssl_cert_password_required != 1)
311 return 0;
312 if (!cert_auth.password) {
313 cert_auth.protocol = xstrdup("cert");
314 cert_auth.username = xstrdup("");
315 cert_auth.path = xstrdup(ssl_cert);
316 credential_fill(&cert_auth);
317 }
318 return 1;
319 }
320
321 #if LIBCURL_VERSION_NUM >= 0x071900
322 static void set_curl_keepalive(CURL *c)
323 {
324 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
325 }
326
327 #elif LIBCURL_VERSION_NUM >= 0x071000
328 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
329 {
330 int ka = 1;
331 int rc;
332 socklen_t len = (socklen_t)sizeof(ka);
333
334 if (type != CURLSOCKTYPE_IPCXN)
335 return 0;
336
337 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
338 if (rc < 0)
339 warning("unable to set SO_KEEPALIVE on socket %s",
340 strerror(errno));
341
342 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
343 }
344
345 static void set_curl_keepalive(CURL *c)
346 {
347 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
348 }
349
350 #else
351 static void set_curl_keepalive(CURL *c)
352 {
353 /* not supported on older curl versions */
354 }
355 #endif
356
357 static CURL *get_curl_handle(void)
358 {
359 CURL *result = curl_easy_init();
360 long allowed_protocols = 0;
361
362 if (!result)
363 die("curl_easy_init failed");
364
365 if (!curl_ssl_verify) {
366 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
367 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
368 } else {
369 /* Verify authenticity of the peer's certificate */
370 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
371 /* The name in the cert must match whom we tried to connect */
372 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
373 }
374
375 #if LIBCURL_VERSION_NUM >= 0x070907
376 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
377 #endif
378 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
379 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
380 #endif
381
382 if (http_proactive_auth)
383 init_curl_http_auth(result);
384
385 if (getenv("GIT_SSL_VERSION"))
386 ssl_version = getenv("GIT_SSL_VERSION");
387 if (ssl_version && *ssl_version) {
388 int i;
389 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
390 if (!strcmp(ssl_version, sslversions[i].name)) {
391 curl_easy_setopt(result, CURLOPT_SSLVERSION,
392 sslversions[i].ssl_version);
393 break;
394 }
395 }
396 if (i == ARRAY_SIZE(sslversions))
397 warning("unsupported ssl version %s: using default",
398 ssl_version);
399 }
400
401 if (getenv("GIT_SSL_CIPHER_LIST"))
402 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
403 if (ssl_cipherlist != NULL && *ssl_cipherlist)
404 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
405 ssl_cipherlist);
406
407 if (ssl_cert != NULL)
408 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
409 if (has_cert_password())
410 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
411 #if LIBCURL_VERSION_NUM >= 0x070903
412 if (ssl_key != NULL)
413 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
414 #endif
415 #if LIBCURL_VERSION_NUM >= 0x070908
416 if (ssl_capath != NULL)
417 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
418 #endif
419 if (ssl_cainfo != NULL)
420 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
421
422 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
423 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
424 curl_low_speed_limit);
425 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
426 curl_low_speed_time);
427 }
428
429 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
430 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
431 #if LIBCURL_VERSION_NUM >= 0x071301
432 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
433 #elif LIBCURL_VERSION_NUM >= 0x071101
434 curl_easy_setopt(result, CURLOPT_POST301, 1);
435 #endif
436 #if LIBCURL_VERSION_NUM >= 0x071304
437 if (is_transport_allowed("http"))
438 allowed_protocols |= CURLPROTO_HTTP;
439 if (is_transport_allowed("https"))
440 allowed_protocols |= CURLPROTO_HTTPS;
441 if (is_transport_allowed("ftp"))
442 allowed_protocols |= CURLPROTO_FTP;
443 if (is_transport_allowed("ftps"))
444 allowed_protocols |= CURLPROTO_FTPS;
445 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
446 #else
447 if (transport_restrict_protocols())
448 warning("protocol restrictions not applied to curl redirects because\n"
449 "your curl version is too old (>= 7.19.4)");
450 #endif
451
452 if (getenv("GIT_CURL_VERBOSE"))
453 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
454
455 curl_easy_setopt(result, CURLOPT_USERAGENT,
456 user_agent ? user_agent : git_user_agent());
457
458 if (curl_ftp_no_epsv)
459 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
460
461 #ifdef CURLOPT_USE_SSL
462 if (curl_ssl_try)
463 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
464 #endif
465
466 if (curl_http_proxy) {
467 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
468 #if LIBCURL_VERSION_NUM >= 0x071800
469 if (starts_with(curl_http_proxy, "socks5h"))
470 curl_easy_setopt(result,
471 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
472 else if (starts_with(curl_http_proxy, "socks5"))
473 curl_easy_setopt(result,
474 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
475 else if (starts_with(curl_http_proxy, "socks4a"))
476 curl_easy_setopt(result,
477 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
478 else if (starts_with(curl_http_proxy, "socks"))
479 curl_easy_setopt(result,
480 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
481 #endif
482 }
483 #if LIBCURL_VERSION_NUM >= 0x070a07
484 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
485 #endif
486
487 set_curl_keepalive(result);
488
489 return result;
490 }
491
492 static void set_from_env(const char **var, const char *envname)
493 {
494 const char *val = getenv(envname);
495 if (val)
496 *var = val;
497 }
498
499 void http_init(struct remote *remote, const char *url, int proactive_auth)
500 {
501 char *low_speed_limit;
502 char *low_speed_time;
503 char *normalized_url;
504 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
505
506 config.section = "http";
507 config.key = NULL;
508 config.collect_fn = http_options;
509 config.cascade_fn = git_default_config;
510 config.cb = NULL;
511
512 http_is_verbose = 0;
513 normalized_url = url_normalize(url, &config.url);
514
515 git_config(urlmatch_config_entry, &config);
516 free(normalized_url);
517
518 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
519 die("curl_global_init failed");
520
521 http_proactive_auth = proactive_auth;
522
523 if (remote && remote->http_proxy)
524 curl_http_proxy = xstrdup(remote->http_proxy);
525
526 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
527 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
528
529 #ifdef USE_CURL_MULTI
530 {
531 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
532 if (http_max_requests != NULL)
533 max_requests = atoi(http_max_requests);
534 }
535
536 curlm = curl_multi_init();
537 if (!curlm)
538 die("curl_multi_init failed");
539 #endif
540
541 if (getenv("GIT_SSL_NO_VERIFY"))
542 curl_ssl_verify = 0;
543
544 set_from_env(&ssl_cert, "GIT_SSL_CERT");
545 #if LIBCURL_VERSION_NUM >= 0x070903
546 set_from_env(&ssl_key, "GIT_SSL_KEY");
547 #endif
548 #if LIBCURL_VERSION_NUM >= 0x070908
549 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
550 #endif
551 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
552
553 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
554
555 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
556 if (low_speed_limit != NULL)
557 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
558 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
559 if (low_speed_time != NULL)
560 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
561
562 if (curl_ssl_verify == -1)
563 curl_ssl_verify = 1;
564
565 curl_session_count = 0;
566 #ifdef USE_CURL_MULTI
567 if (max_requests < 1)
568 max_requests = DEFAULT_MAX_REQUESTS;
569 #endif
570
571 if (getenv("GIT_CURL_FTP_NO_EPSV"))
572 curl_ftp_no_epsv = 1;
573
574 if (url) {
575 credential_from_url(&http_auth, url);
576 if (!ssl_cert_password_required &&
577 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
578 starts_with(url, "https://"))
579 ssl_cert_password_required = 1;
580 }
581
582 #ifndef NO_CURL_EASY_DUPHANDLE
583 curl_default = get_curl_handle();
584 #endif
585 }
586
587 void http_cleanup(void)
588 {
589 struct active_request_slot *slot = active_queue_head;
590
591 while (slot != NULL) {
592 struct active_request_slot *next = slot->next;
593 if (slot->curl != NULL) {
594 #ifdef USE_CURL_MULTI
595 curl_multi_remove_handle(curlm, slot->curl);
596 #endif
597 curl_easy_cleanup(slot->curl);
598 }
599 free(slot);
600 slot = next;
601 }
602 active_queue_head = NULL;
603
604 #ifndef NO_CURL_EASY_DUPHANDLE
605 curl_easy_cleanup(curl_default);
606 #endif
607
608 #ifdef USE_CURL_MULTI
609 curl_multi_cleanup(curlm);
610 #endif
611 curl_global_cleanup();
612
613 curl_slist_free_all(pragma_header);
614 pragma_header = NULL;
615
616 curl_slist_free_all(no_pragma_header);
617 no_pragma_header = NULL;
618
619 if (curl_http_proxy) {
620 free((void *)curl_http_proxy);
621 curl_http_proxy = NULL;
622 }
623
624 if (cert_auth.password != NULL) {
625 memset(cert_auth.password, 0, strlen(cert_auth.password));
626 free(cert_auth.password);
627 cert_auth.password = NULL;
628 }
629 ssl_cert_password_required = 0;
630
631 free(cached_accept_language);
632 cached_accept_language = NULL;
633 }
634
635 struct active_request_slot *get_active_slot(void)
636 {
637 struct active_request_slot *slot = active_queue_head;
638 struct active_request_slot *newslot;
639
640 #ifdef USE_CURL_MULTI
641 int num_transfers;
642
643 /* Wait for a slot to open up if the queue is full */
644 while (active_requests >= max_requests) {
645 curl_multi_perform(curlm, &num_transfers);
646 if (num_transfers < active_requests)
647 process_curl_messages();
648 }
649 #endif
650
651 while (slot != NULL && slot->in_use)
652 slot = slot->next;
653
654 if (slot == NULL) {
655 newslot = xmalloc(sizeof(*newslot));
656 newslot->curl = NULL;
657 newslot->in_use = 0;
658 newslot->next = NULL;
659
660 slot = active_queue_head;
661 if (slot == NULL) {
662 active_queue_head = newslot;
663 } else {
664 while (slot->next != NULL)
665 slot = slot->next;
666 slot->next = newslot;
667 }
668 slot = newslot;
669 }
670
671 if (slot->curl == NULL) {
672 #ifdef NO_CURL_EASY_DUPHANDLE
673 slot->curl = get_curl_handle();
674 #else
675 slot->curl = curl_easy_duphandle(curl_default);
676 #endif
677 curl_session_count++;
678 }
679
680 active_requests++;
681 slot->in_use = 1;
682 slot->results = NULL;
683 slot->finished = NULL;
684 slot->callback_data = NULL;
685 slot->callback_func = NULL;
686 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
687 if (curl_save_cookies)
688 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
689 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
690 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
691 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
692 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
693 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
694 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
695 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
696 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
697 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
698 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
699 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
700 #endif
701 if (http_auth.password)
702 init_curl_http_auth(slot->curl);
703
704 return slot;
705 }
706
707 int start_active_slot(struct active_request_slot *slot)
708 {
709 #ifdef USE_CURL_MULTI
710 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
711 int num_transfers;
712
713 if (curlm_result != CURLM_OK &&
714 curlm_result != CURLM_CALL_MULTI_PERFORM) {
715 active_requests--;
716 slot->in_use = 0;
717 return 0;
718 }
719
720 /*
721 * We know there must be something to do, since we just added
722 * something.
723 */
724 curl_multi_perform(curlm, &num_transfers);
725 #endif
726 return 1;
727 }
728
729 #ifdef USE_CURL_MULTI
730 struct fill_chain {
731 void *data;
732 int (*fill)(void *);
733 struct fill_chain *next;
734 };
735
736 static struct fill_chain *fill_cfg;
737
738 void add_fill_function(void *data, int (*fill)(void *))
739 {
740 struct fill_chain *new = xmalloc(sizeof(*new));
741 struct fill_chain **linkp = &fill_cfg;
742 new->data = data;
743 new->fill = fill;
744 new->next = NULL;
745 while (*linkp)
746 linkp = &(*linkp)->next;
747 *linkp = new;
748 }
749
750 void fill_active_slots(void)
751 {
752 struct active_request_slot *slot = active_queue_head;
753
754 while (active_requests < max_requests) {
755 struct fill_chain *fill;
756 for (fill = fill_cfg; fill; fill = fill->next)
757 if (fill->fill(fill->data))
758 break;
759
760 if (!fill)
761 break;
762 }
763
764 while (slot != NULL) {
765 if (!slot->in_use && slot->curl != NULL
766 && curl_session_count > min_curl_sessions) {
767 curl_easy_cleanup(slot->curl);
768 slot->curl = NULL;
769 curl_session_count--;
770 }
771 slot = slot->next;
772 }
773 }
774
775 void step_active_slots(void)
776 {
777 int num_transfers;
778 CURLMcode curlm_result;
779
780 do {
781 curlm_result = curl_multi_perform(curlm, &num_transfers);
782 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
783 if (num_transfers < active_requests) {
784 process_curl_messages();
785 fill_active_slots();
786 }
787 }
788 #endif
789
790 void run_active_slot(struct active_request_slot *slot)
791 {
792 #ifdef USE_CURL_MULTI
793 fd_set readfds;
794 fd_set writefds;
795 fd_set excfds;
796 int max_fd;
797 struct timeval select_timeout;
798 int finished = 0;
799
800 slot->finished = &finished;
801 while (!finished) {
802 step_active_slots();
803
804 if (slot->in_use) {
805 #if LIBCURL_VERSION_NUM >= 0x070f04
806 long curl_timeout;
807 curl_multi_timeout(curlm, &curl_timeout);
808 if (curl_timeout == 0) {
809 continue;
810 } else if (curl_timeout == -1) {
811 select_timeout.tv_sec = 0;
812 select_timeout.tv_usec = 50000;
813 } else {
814 select_timeout.tv_sec = curl_timeout / 1000;
815 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
816 }
817 #else
818 select_timeout.tv_sec = 0;
819 select_timeout.tv_usec = 50000;
820 #endif
821
822 max_fd = -1;
823 FD_ZERO(&readfds);
824 FD_ZERO(&writefds);
825 FD_ZERO(&excfds);
826 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
827
828 /*
829 * It can happen that curl_multi_timeout returns a pathologically
830 * long timeout when curl_multi_fdset returns no file descriptors
831 * to read. See commit message for more details.
832 */
833 if (max_fd < 0 &&
834 (select_timeout.tv_sec > 0 ||
835 select_timeout.tv_usec > 50000)) {
836 select_timeout.tv_sec = 0;
837 select_timeout.tv_usec = 50000;
838 }
839
840 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
841 }
842 }
843 #else
844 while (slot->in_use) {
845 slot->curl_result = curl_easy_perform(slot->curl);
846 finish_active_slot(slot);
847 }
848 #endif
849 }
850
851 static void release_active_slot(struct active_request_slot *slot)
852 {
853 closedown_active_slot(slot);
854 if (slot->curl && curl_session_count > min_curl_sessions) {
855 #ifdef USE_CURL_MULTI
856 curl_multi_remove_handle(curlm, slot->curl);
857 #endif
858 curl_easy_cleanup(slot->curl);
859 slot->curl = NULL;
860 curl_session_count--;
861 }
862 #ifdef USE_CURL_MULTI
863 fill_active_slots();
864 #endif
865 }
866
867 void finish_all_active_slots(void)
868 {
869 struct active_request_slot *slot = active_queue_head;
870
871 while (slot != NULL)
872 if (slot->in_use) {
873 run_active_slot(slot);
874 slot = active_queue_head;
875 } else {
876 slot = slot->next;
877 }
878 }
879
880 /* Helpers for modifying and creating URLs */
881 static inline int needs_quote(int ch)
882 {
883 if (((ch >= 'A') && (ch <= 'Z'))
884 || ((ch >= 'a') && (ch <= 'z'))
885 || ((ch >= '0') && (ch <= '9'))
886 || (ch == '/')
887 || (ch == '-')
888 || (ch == '.'))
889 return 0;
890 return 1;
891 }
892
893 static char *quote_ref_url(const char *base, const char *ref)
894 {
895 struct strbuf buf = STRBUF_INIT;
896 const char *cp;
897 int ch;
898
899 end_url_with_slash(&buf, base);
900
901 for (cp = ref; (ch = *cp) != 0; cp++)
902 if (needs_quote(ch))
903 strbuf_addf(&buf, "%%%02x", ch);
904 else
905 strbuf_addch(&buf, *cp);
906
907 return strbuf_detach(&buf, NULL);
908 }
909
910 void append_remote_object_url(struct strbuf *buf, const char *url,
911 const char *hex,
912 int only_two_digit_prefix)
913 {
914 end_url_with_slash(buf, url);
915
916 strbuf_addf(buf, "objects/%.*s/", 2, hex);
917 if (!only_two_digit_prefix)
918 strbuf_addf(buf, "%s", hex+2);
919 }
920
921 char *get_remote_object_url(const char *url, const char *hex,
922 int only_two_digit_prefix)
923 {
924 struct strbuf buf = STRBUF_INIT;
925 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
926 return strbuf_detach(&buf, NULL);
927 }
928
929 static int handle_curl_result(struct slot_results *results)
930 {
931 /*
932 * If we see a failing http code with CURLE_OK, we have turned off
933 * FAILONERROR (to keep the server's custom error response), and should
934 * translate the code into failure here.
935 */
936 if (results->curl_result == CURLE_OK &&
937 results->http_code >= 400) {
938 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
939 /*
940 * Normally curl will already have put the "reason phrase"
941 * from the server into curl_errorstr; unfortunately without
942 * FAILONERROR it is lost, so we can give only the numeric
943 * status code.
944 */
945 snprintf(curl_errorstr, sizeof(curl_errorstr),
946 "The requested URL returned error: %ld",
947 results->http_code);
948 }
949
950 if (results->curl_result == CURLE_OK) {
951 credential_approve(&http_auth);
952 return HTTP_OK;
953 } else if (missing_target(results))
954 return HTTP_MISSING_TARGET;
955 else if (results->http_code == 401) {
956 if (http_auth.username && http_auth.password) {
957 credential_reject(&http_auth);
958 return HTTP_NOAUTH;
959 } else {
960 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
961 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
962 #endif
963 return HTTP_REAUTH;
964 }
965 } else {
966 #if LIBCURL_VERSION_NUM >= 0x070c00
967 if (!curl_errorstr[0])
968 strlcpy(curl_errorstr,
969 curl_easy_strerror(results->curl_result),
970 sizeof(curl_errorstr));
971 #endif
972 return HTTP_ERROR;
973 }
974 }
975
976 int run_one_slot(struct active_request_slot *slot,
977 struct slot_results *results)
978 {
979 slot->results = results;
980 if (!start_active_slot(slot)) {
981 snprintf(curl_errorstr, sizeof(curl_errorstr),
982 "failed to start HTTP request");
983 return HTTP_START_FAILED;
984 }
985
986 run_active_slot(slot);
987 return handle_curl_result(results);
988 }
989
990 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
991 {
992 char *ptr;
993 CURLcode ret;
994
995 strbuf_reset(buf);
996 ret = curl_easy_getinfo(curl, info, &ptr);
997 if (!ret && ptr)
998 strbuf_addstr(buf, ptr);
999 return ret;
1000 }
1001
1002 /*
1003 * Check for and extract a content-type parameter. "raw"
1004 * should be positioned at the start of the potential
1005 * parameter, with any whitespace already removed.
1006 *
1007 * "name" is the name of the parameter. The value is appended
1008 * to "out".
1009 */
1010 static int extract_param(const char *raw, const char *name,
1011 struct strbuf *out)
1012 {
1013 size_t len = strlen(name);
1014
1015 if (strncasecmp(raw, name, len))
1016 return -1;
1017 raw += len;
1018
1019 if (*raw != '=')
1020 return -1;
1021 raw++;
1022
1023 while (*raw && !isspace(*raw) && *raw != ';')
1024 strbuf_addch(out, *raw++);
1025 return 0;
1026 }
1027
1028 /*
1029 * Extract a normalized version of the content type, with any
1030 * spaces suppressed, all letters lowercased, and no trailing ";"
1031 * or parameters.
1032 *
1033 * Note that we will silently remove even invalid whitespace. For
1034 * example, "text / plain" is specifically forbidden by RFC 2616,
1035 * but "text/plain" is the only reasonable output, and this keeps
1036 * our code simple.
1037 *
1038 * If the "charset" argument is not NULL, store the value of any
1039 * charset parameter there.
1040 *
1041 * Example:
1042 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1043 * "text / plain" -> "text/plain"
1044 */
1045 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1046 struct strbuf *charset)
1047 {
1048 const char *p;
1049
1050 strbuf_reset(type);
1051 strbuf_grow(type, raw->len);
1052 for (p = raw->buf; *p; p++) {
1053 if (isspace(*p))
1054 continue;
1055 if (*p == ';') {
1056 p++;
1057 break;
1058 }
1059 strbuf_addch(type, tolower(*p));
1060 }
1061
1062 if (!charset)
1063 return;
1064
1065 strbuf_reset(charset);
1066 while (*p) {
1067 while (isspace(*p) || *p == ';')
1068 p++;
1069 if (!extract_param(p, "charset", charset))
1070 return;
1071 while (*p && !isspace(*p))
1072 p++;
1073 }
1074
1075 if (!charset->len && starts_with(type->buf, "text/"))
1076 strbuf_addstr(charset, "ISO-8859-1");
1077 }
1078
1079 static void write_accept_language(struct strbuf *buf)
1080 {
1081 /*
1082 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1083 * that, q-value will be smaller than 0.001, the minimum q-value the
1084 * HTTP specification allows. See
1085 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1086 */
1087 const int MAX_DECIMAL_PLACES = 3;
1088 const int MAX_LANGUAGE_TAGS = 1000;
1089 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1090 char **language_tags = NULL;
1091 int num_langs = 0;
1092 const char *s = get_preferred_languages();
1093 int i;
1094 struct strbuf tag = STRBUF_INIT;
1095
1096 /* Don't add Accept-Language header if no language is preferred. */
1097 if (!s)
1098 return;
1099
1100 /*
1101 * Split the colon-separated string of preferred languages into
1102 * language_tags array.
1103 */
1104 do {
1105 /* collect language tag */
1106 for (; *s && (isalnum(*s) || *s == '_'); s++)
1107 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1108
1109 /* skip .codeset, @modifier and any other unnecessary parts */
1110 while (*s && *s != ':')
1111 s++;
1112
1113 if (tag.len) {
1114 num_langs++;
1115 REALLOC_ARRAY(language_tags, num_langs);
1116 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1117 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1118 break;
1119 }
1120 } while (*s++);
1121
1122 /* write Accept-Language header into buf */
1123 if (num_langs) {
1124 int last_buf_len = 0;
1125 int max_q;
1126 int decimal_places;
1127 char q_format[32];
1128
1129 /* add '*' */
1130 REALLOC_ARRAY(language_tags, num_langs + 1);
1131 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1132
1133 /* compute decimal_places */
1134 for (max_q = 1, decimal_places = 0;
1135 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1136 decimal_places++, max_q *= 10)
1137 ;
1138
1139 sprintf(q_format, ";q=0.%%0%dd", decimal_places);
1140
1141 strbuf_addstr(buf, "Accept-Language: ");
1142
1143 for (i = 0; i < num_langs; i++) {
1144 if (i > 0)
1145 strbuf_addstr(buf, ", ");
1146
1147 strbuf_addstr(buf, language_tags[i]);
1148
1149 if (i > 0)
1150 strbuf_addf(buf, q_format, max_q - i);
1151
1152 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1153 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1154 break;
1155 }
1156
1157 last_buf_len = buf->len;
1158 }
1159 }
1160
1161 /* free language tags -- last one is a static '*' */
1162 for (i = 0; i < num_langs - 1; i++)
1163 free(language_tags[i]);
1164 free(language_tags);
1165 }
1166
1167 /*
1168 * Get an Accept-Language header which indicates user's preferred languages.
1169 *
1170 * Examples:
1171 * LANGUAGE= -> ""
1172 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1173 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1174 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1175 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1176 * LANGUAGE= LANG=C -> ""
1177 */
1178 static const char *get_accept_language(void)
1179 {
1180 if (!cached_accept_language) {
1181 struct strbuf buf = STRBUF_INIT;
1182 write_accept_language(&buf);
1183 if (buf.len > 0)
1184 cached_accept_language = strbuf_detach(&buf, NULL);
1185 }
1186
1187 return cached_accept_language;
1188 }
1189
1190 /* http_request() targets */
1191 #define HTTP_REQUEST_STRBUF 0
1192 #define HTTP_REQUEST_FILE 1
1193
1194 static int http_request(const char *url,
1195 void *result, int target,
1196 const struct http_get_options *options)
1197 {
1198 struct active_request_slot *slot;
1199 struct slot_results results;
1200 struct curl_slist *headers = NULL;
1201 struct strbuf buf = STRBUF_INIT;
1202 const char *accept_language;
1203 int ret;
1204
1205 slot = get_active_slot();
1206 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1207
1208 if (result == NULL) {
1209 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1210 } else {
1211 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1212 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1213
1214 if (target == HTTP_REQUEST_FILE) {
1215 long posn = ftell(result);
1216 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1217 fwrite);
1218 if (posn > 0) {
1219 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1220 headers = curl_slist_append(headers, buf.buf);
1221 strbuf_reset(&buf);
1222 }
1223 } else
1224 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1225 fwrite_buffer);
1226 }
1227
1228 accept_language = get_accept_language();
1229
1230 if (accept_language)
1231 headers = curl_slist_append(headers, accept_language);
1232
1233 strbuf_addstr(&buf, "Pragma:");
1234 if (options && options->no_cache)
1235 strbuf_addstr(&buf, " no-cache");
1236 if (options && options->keep_error)
1237 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1238
1239 headers = curl_slist_append(headers, buf.buf);
1240
1241 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1242 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1243 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1244
1245 ret = run_one_slot(slot, &results);
1246
1247 if (options && options->content_type) {
1248 struct strbuf raw = STRBUF_INIT;
1249 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1250 extract_content_type(&raw, options->content_type,
1251 options->charset);
1252 strbuf_release(&raw);
1253 }
1254
1255 if (options && options->effective_url)
1256 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1257 options->effective_url);
1258
1259 curl_slist_free_all(headers);
1260 strbuf_release(&buf);
1261
1262 return ret;
1263 }
1264
1265 /*
1266 * Update the "base" url to a more appropriate value, as deduced by
1267 * redirects seen when requesting a URL starting with "url".
1268 *
1269 * The "asked" parameter is a URL that we asked curl to access, and must begin
1270 * with "base".
1271 *
1272 * The "got" parameter is the URL that curl reported to us as where we ended
1273 * up.
1274 *
1275 * Returns 1 if we updated the base url, 0 otherwise.
1276 *
1277 * Our basic strategy is to compare "base" and "asked" to find the bits
1278 * specific to our request. We then strip those bits off of "got" to yield the
1279 * new base. So for example, if our base is "http://example.com/foo.git",
1280 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1281 * with "https://other.example.com/foo.git/info/refs". We would want the
1282 * new URL to become "https://other.example.com/foo.git".
1283 *
1284 * Note that this assumes a sane redirect scheme. It's entirely possible
1285 * in the example above to end up at a URL that does not even end in
1286 * "info/refs". In such a case we simply punt, as there is not much we can
1287 * do (and such a scheme is unlikely to represent a real git repository,
1288 * which means we are likely about to abort anyway).
1289 */
1290 static int update_url_from_redirect(struct strbuf *base,
1291 const char *asked,
1292 const struct strbuf *got)
1293 {
1294 const char *tail;
1295 size_t tail_len;
1296
1297 if (!strcmp(asked, got->buf))
1298 return 0;
1299
1300 if (!skip_prefix(asked, base->buf, &tail))
1301 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1302 asked, base->buf);
1303
1304 tail_len = strlen(tail);
1305
1306 if (got->len < tail_len ||
1307 strcmp(tail, got->buf + got->len - tail_len))
1308 return 0; /* insane redirect scheme */
1309
1310 strbuf_reset(base);
1311 strbuf_add(base, got->buf, got->len - tail_len);
1312 return 1;
1313 }
1314
1315 static int http_request_reauth(const char *url,
1316 void *result, int target,
1317 struct http_get_options *options)
1318 {
1319 int ret = http_request(url, result, target, options);
1320
1321 if (options && options->effective_url && options->base_url) {
1322 if (update_url_from_redirect(options->base_url,
1323 url, options->effective_url)) {
1324 credential_from_url(&http_auth, options->base_url->buf);
1325 url = options->effective_url->buf;
1326 }
1327 }
1328
1329 if (ret != HTTP_REAUTH)
1330 return ret;
1331
1332 /*
1333 * If we are using KEEP_ERROR, the previous request may have
1334 * put cruft into our output stream; we should clear it out before
1335 * making our next request. We only know how to do this for
1336 * the strbuf case, but that is enough to satisfy current callers.
1337 */
1338 if (options && options->keep_error) {
1339 switch (target) {
1340 case HTTP_REQUEST_STRBUF:
1341 strbuf_reset(result);
1342 break;
1343 default:
1344 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1345 }
1346 }
1347
1348 credential_fill(&http_auth);
1349
1350 return http_request(url, result, target, options);
1351 }
1352
1353 int http_get_strbuf(const char *url,
1354 struct strbuf *result,
1355 struct http_get_options *options)
1356 {
1357 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1358 }
1359
1360 /*
1361 * Downloads a URL and stores the result in the given file.
1362 *
1363 * If a previous interrupted download is detected (i.e. a previous temporary
1364 * file is still around) the download is resumed.
1365 */
1366 static int http_get_file(const char *url, const char *filename,
1367 struct http_get_options *options)
1368 {
1369 int ret;
1370 struct strbuf tmpfile = STRBUF_INIT;
1371 FILE *result;
1372
1373 strbuf_addf(&tmpfile, "%s.temp", filename);
1374 result = fopen(tmpfile.buf, "a");
1375 if (!result) {
1376 error("Unable to open local file %s", tmpfile.buf);
1377 ret = HTTP_ERROR;
1378 goto cleanup;
1379 }
1380
1381 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1382 fclose(result);
1383
1384 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1385 ret = HTTP_ERROR;
1386 cleanup:
1387 strbuf_release(&tmpfile);
1388 return ret;
1389 }
1390
1391 int http_fetch_ref(const char *base, struct ref *ref)
1392 {
1393 struct http_get_options options = {0};
1394 char *url;
1395 struct strbuf buffer = STRBUF_INIT;
1396 int ret = -1;
1397
1398 options.no_cache = 1;
1399
1400 url = quote_ref_url(base, ref->name);
1401 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1402 strbuf_rtrim(&buffer);
1403 if (buffer.len == 40)
1404 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1405 else if (starts_with(buffer.buf, "ref: ")) {
1406 ref->symref = xstrdup(buffer.buf + 5);
1407 ret = 0;
1408 }
1409 }
1410
1411 strbuf_release(&buffer);
1412 free(url);
1413 return ret;
1414 }
1415
1416 /* Helpers for fetching packs */
1417 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1418 {
1419 char *url, *tmp;
1420 struct strbuf buf = STRBUF_INIT;
1421
1422 if (http_is_verbose)
1423 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1424
1425 end_url_with_slash(&buf, base_url);
1426 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1427 url = strbuf_detach(&buf, NULL);
1428
1429 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1430 tmp = strbuf_detach(&buf, NULL);
1431
1432 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1433 error("Unable to get pack index %s", url);
1434 free(tmp);
1435 tmp = NULL;
1436 }
1437
1438 free(url);
1439 return tmp;
1440 }
1441
1442 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1443 unsigned char *sha1, const char *base_url)
1444 {
1445 struct packed_git *new_pack;
1446 char *tmp_idx = NULL;
1447 int ret;
1448
1449 if (has_pack_index(sha1)) {
1450 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1451 if (!new_pack)
1452 return -1; /* parse_pack_index() already issued error message */
1453 goto add_pack;
1454 }
1455
1456 tmp_idx = fetch_pack_index(sha1, base_url);
1457 if (!tmp_idx)
1458 return -1;
1459
1460 new_pack = parse_pack_index(sha1, tmp_idx);
1461 if (!new_pack) {
1462 unlink(tmp_idx);
1463 free(tmp_idx);
1464
1465 return -1; /* parse_pack_index() already issued error message */
1466 }
1467
1468 ret = verify_pack_index(new_pack);
1469 if (!ret) {
1470 close_pack_index(new_pack);
1471 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1472 }
1473 free(tmp_idx);
1474 if (ret)
1475 return -1;
1476
1477 add_pack:
1478 new_pack->next = *packs_head;
1479 *packs_head = new_pack;
1480 return 0;
1481 }
1482
1483 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1484 {
1485 struct http_get_options options = {0};
1486 int ret = 0, i = 0;
1487 char *url, *data;
1488 struct strbuf buf = STRBUF_INIT;
1489 unsigned char sha1[20];
1490
1491 end_url_with_slash(&buf, base_url);
1492 strbuf_addstr(&buf, "objects/info/packs");
1493 url = strbuf_detach(&buf, NULL);
1494
1495 options.no_cache = 1;
1496 ret = http_get_strbuf(url, &buf, &options);
1497 if (ret != HTTP_OK)
1498 goto cleanup;
1499
1500 data = buf.buf;
1501 while (i < buf.len) {
1502 switch (data[i]) {
1503 case 'P':
1504 i++;
1505 if (i + 52 <= buf.len &&
1506 starts_with(data + i, " pack-") &&
1507 starts_with(data + i + 46, ".pack\n")) {
1508 get_sha1_hex(data + i + 6, sha1);
1509 fetch_and_setup_pack_index(packs_head, sha1,
1510 base_url);
1511 i += 51;
1512 break;
1513 }
1514 default:
1515 while (i < buf.len && data[i] != '\n')
1516 i++;
1517 }
1518 i++;
1519 }
1520
1521 cleanup:
1522 free(url);
1523 return ret;
1524 }
1525
1526 void release_http_pack_request(struct http_pack_request *preq)
1527 {
1528 if (preq->packfile != NULL) {
1529 fclose(preq->packfile);
1530 preq->packfile = NULL;
1531 }
1532 if (preq->range_header != NULL) {
1533 curl_slist_free_all(preq->range_header);
1534 preq->range_header = NULL;
1535 }
1536 preq->slot = NULL;
1537 free(preq->url);
1538 free(preq);
1539 }
1540
1541 int finish_http_pack_request(struct http_pack_request *preq)
1542 {
1543 struct packed_git **lst;
1544 struct packed_git *p = preq->target;
1545 char *tmp_idx;
1546 struct child_process ip = CHILD_PROCESS_INIT;
1547 const char *ip_argv[8];
1548
1549 close_pack_index(p);
1550
1551 fclose(preq->packfile);
1552 preq->packfile = NULL;
1553
1554 lst = preq->lst;
1555 while (*lst != p)
1556 lst = &((*lst)->next);
1557 *lst = (*lst)->next;
1558
1559 tmp_idx = xstrdup(preq->tmpfile);
1560 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1561 ".idx.temp");
1562
1563 ip_argv[0] = "index-pack";
1564 ip_argv[1] = "-o";
1565 ip_argv[2] = tmp_idx;
1566 ip_argv[3] = preq->tmpfile;
1567 ip_argv[4] = NULL;
1568
1569 ip.argv = ip_argv;
1570 ip.git_cmd = 1;
1571 ip.no_stdin = 1;
1572 ip.no_stdout = 1;
1573
1574 if (run_command(&ip)) {
1575 unlink(preq->tmpfile);
1576 unlink(tmp_idx);
1577 free(tmp_idx);
1578 return -1;
1579 }
1580
1581 unlink(sha1_pack_index_name(p->sha1));
1582
1583 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1584 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1585 free(tmp_idx);
1586 return -1;
1587 }
1588
1589 install_packed_git(p);
1590 free(tmp_idx);
1591 return 0;
1592 }
1593
1594 struct http_pack_request *new_http_pack_request(
1595 struct packed_git *target, const char *base_url)
1596 {
1597 long prev_posn = 0;
1598 char range[RANGE_HEADER_SIZE];
1599 struct strbuf buf = STRBUF_INIT;
1600 struct http_pack_request *preq;
1601
1602 preq = xcalloc(1, sizeof(*preq));
1603 preq->target = target;
1604
1605 end_url_with_slash(&buf, base_url);
1606 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1607 sha1_to_hex(target->sha1));
1608 preq->url = strbuf_detach(&buf, NULL);
1609
1610 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1611 sha1_pack_name(target->sha1));
1612 preq->packfile = fopen(preq->tmpfile, "a");
1613 if (!preq->packfile) {
1614 error("Unable to open local file %s for pack",
1615 preq->tmpfile);
1616 goto abort;
1617 }
1618
1619 preq->slot = get_active_slot();
1620 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1621 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1622 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1623 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1624 no_pragma_header);
1625
1626 /*
1627 * If there is data present from a previous transfer attempt,
1628 * resume where it left off
1629 */
1630 prev_posn = ftell(preq->packfile);
1631 if (prev_posn>0) {
1632 if (http_is_verbose)
1633 fprintf(stderr,
1634 "Resuming fetch of pack %s at byte %ld\n",
1635 sha1_to_hex(target->sha1), prev_posn);
1636 sprintf(range, "Range: bytes=%ld-", prev_posn);
1637 preq->range_header = curl_slist_append(NULL, range);
1638 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1639 preq->range_header);
1640 }
1641
1642 return preq;
1643
1644 abort:
1645 free(preq->url);
1646 free(preq);
1647 return NULL;
1648 }
1649
1650 /* Helpers for fetching objects (loose) */
1651 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1652 void *data)
1653 {
1654 unsigned char expn[4096];
1655 size_t size = eltsize * nmemb;
1656 int posn = 0;
1657 struct http_object_request *freq =
1658 (struct http_object_request *)data;
1659 do {
1660 ssize_t retval = xwrite(freq->localfile,
1661 (char *) ptr + posn, size - posn);
1662 if (retval < 0)
1663 return posn;
1664 posn += retval;
1665 } while (posn < size);
1666
1667 freq->stream.avail_in = size;
1668 freq->stream.next_in = (void *)ptr;
1669 do {
1670 freq->stream.next_out = expn;
1671 freq->stream.avail_out = sizeof(expn);
1672 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1673 git_SHA1_Update(&freq->c, expn,
1674 sizeof(expn) - freq->stream.avail_out);
1675 } while (freq->stream.avail_in && freq->zret == Z_OK);
1676 return size;
1677 }
1678
1679 struct http_object_request *new_http_object_request(const char *base_url,
1680 unsigned char *sha1)
1681 {
1682 char *hex = sha1_to_hex(sha1);
1683 const char *filename;
1684 char prevfile[PATH_MAX];
1685 int prevlocal;
1686 char prev_buf[PREV_BUF_SIZE];
1687 ssize_t prev_read = 0;
1688 long prev_posn = 0;
1689 char range[RANGE_HEADER_SIZE];
1690 struct curl_slist *range_header = NULL;
1691 struct http_object_request *freq;
1692
1693 freq = xcalloc(1, sizeof(*freq));
1694 hashcpy(freq->sha1, sha1);
1695 freq->localfile = -1;
1696
1697 filename = sha1_file_name(sha1);
1698 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1699 "%s.temp", filename);
1700
1701 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1702 unlink_or_warn(prevfile);
1703 rename(freq->tmpfile, prevfile);
1704 unlink_or_warn(freq->tmpfile);
1705
1706 if (freq->localfile != -1)
1707 error("fd leakage in start: %d", freq->localfile);
1708 freq->localfile = open(freq->tmpfile,
1709 O_WRONLY | O_CREAT | O_EXCL, 0666);
1710 /*
1711 * This could have failed due to the "lazy directory creation";
1712 * try to mkdir the last path component.
1713 */
1714 if (freq->localfile < 0 && errno == ENOENT) {
1715 char *dir = strrchr(freq->tmpfile, '/');
1716 if (dir) {
1717 *dir = 0;
1718 mkdir(freq->tmpfile, 0777);
1719 *dir = '/';
1720 }
1721 freq->localfile = open(freq->tmpfile,
1722 O_WRONLY | O_CREAT | O_EXCL, 0666);
1723 }
1724
1725 if (freq->localfile < 0) {
1726 error("Couldn't create temporary file %s: %s",
1727 freq->tmpfile, strerror(errno));
1728 goto abort;
1729 }
1730
1731 git_inflate_init(&freq->stream);
1732
1733 git_SHA1_Init(&freq->c);
1734
1735 freq->url = get_remote_object_url(base_url, hex, 0);
1736
1737 /*
1738 * If a previous temp file is present, process what was already
1739 * fetched.
1740 */
1741 prevlocal = open(prevfile, O_RDONLY);
1742 if (prevlocal != -1) {
1743 do {
1744 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1745 if (prev_read>0) {
1746 if (fwrite_sha1_file(prev_buf,
1747 1,
1748 prev_read,
1749 freq) == prev_read) {
1750 prev_posn += prev_read;
1751 } else {
1752 prev_read = -1;
1753 }
1754 }
1755 } while (prev_read > 0);
1756 close(prevlocal);
1757 }
1758 unlink_or_warn(prevfile);
1759
1760 /*
1761 * Reset inflate/SHA1 if there was an error reading the previous temp
1762 * file; also rewind to the beginning of the local file.
1763 */
1764 if (prev_read == -1) {
1765 memset(&freq->stream, 0, sizeof(freq->stream));
1766 git_inflate_init(&freq->stream);
1767 git_SHA1_Init(&freq->c);
1768 if (prev_posn>0) {
1769 prev_posn = 0;
1770 lseek(freq->localfile, 0, SEEK_SET);
1771 if (ftruncate(freq->localfile, 0) < 0) {
1772 error("Couldn't truncate temporary file %s: %s",
1773 freq->tmpfile, strerror(errno));
1774 goto abort;
1775 }
1776 }
1777 }
1778
1779 freq->slot = get_active_slot();
1780
1781 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1782 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1783 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1784 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1785 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1786
1787 /*
1788 * If we have successfully processed data from a previous fetch
1789 * attempt, only fetch the data we don't already have.
1790 */
1791 if (prev_posn>0) {
1792 if (http_is_verbose)
1793 fprintf(stderr,
1794 "Resuming fetch of object %s at byte %ld\n",
1795 hex, prev_posn);
1796 sprintf(range, "Range: bytes=%ld-", prev_posn);
1797 range_header = curl_slist_append(range_header, range);
1798 curl_easy_setopt(freq->slot->curl,
1799 CURLOPT_HTTPHEADER, range_header);
1800 }
1801
1802 return freq;
1803
1804 abort:
1805 free(freq->url);
1806 free(freq);
1807 return NULL;
1808 }
1809
1810 void process_http_object_request(struct http_object_request *freq)
1811 {
1812 if (freq->slot == NULL)
1813 return;
1814 freq->curl_result = freq->slot->curl_result;
1815 freq->http_code = freq->slot->http_code;
1816 freq->slot = NULL;
1817 }
1818
1819 int finish_http_object_request(struct http_object_request *freq)
1820 {
1821 struct stat st;
1822
1823 close(freq->localfile);
1824 freq->localfile = -1;
1825
1826 process_http_object_request(freq);
1827
1828 if (freq->http_code == 416) {
1829 warning("requested range invalid; we may already have all the data.");
1830 } else if (freq->curl_result != CURLE_OK) {
1831 if (stat(freq->tmpfile, &st) == 0)
1832 if (st.st_size == 0)
1833 unlink_or_warn(freq->tmpfile);
1834 return -1;
1835 }
1836
1837 git_inflate_end(&freq->stream);
1838 git_SHA1_Final(freq->real_sha1, &freq->c);
1839 if (freq->zret != Z_STREAM_END) {
1840 unlink_or_warn(freq->tmpfile);
1841 return -1;
1842 }
1843 if (hashcmp(freq->sha1, freq->real_sha1)) {
1844 unlink_or_warn(freq->tmpfile);
1845 return -1;
1846 }
1847 freq->rename =
1848 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
1849
1850 return freq->rename;
1851 }
1852
1853 void abort_http_object_request(struct http_object_request *freq)
1854 {
1855 unlink_or_warn(freq->tmpfile);
1856
1857 release_http_object_request(freq);
1858 }
1859
1860 void release_http_object_request(struct http_object_request *freq)
1861 {
1862 if (freq->localfile != -1) {
1863 close(freq->localfile);
1864 freq->localfile = -1;
1865 }
1866 if (freq->url != NULL) {
1867 free(freq->url);
1868 freq->url = NULL;
1869 }
1870 if (freq->slot != NULL) {
1871 freq->slot->callback_func = NULL;
1872 freq->slot->callback_data = NULL;
1873 release_active_slot(freq->slot);
1874 freq->slot = NULL;
1875 }
1876 }
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