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server-info.c: use error_errno()
[git/git-svn.git] / http.c
blobfa39b879cecbe3402075600ce9edfbee08eee986
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 #if LIBCURL_VERSION_NUM >= 0x070a08
15 long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
16 #else
17 long int git_curl_ipresolve;
18 #endif
19 int active_requests;
20 int http_is_verbose;
21 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
22
23 #if LIBCURL_VERSION_NUM >= 0x070a06
24 #define LIBCURL_CAN_HANDLE_AUTH_ANY
25 #endif
26
27 static int min_curl_sessions = 1;
28 static int curl_session_count;
29 #ifdef USE_CURL_MULTI
30 static int max_requests = -1;
31 static CURLM *curlm;
32 #endif
33 #ifndef NO_CURL_EASY_DUPHANDLE
34 static CURL *curl_default;
35 #endif
36
37 #define PREV_BUF_SIZE 4096
38
39 char curl_errorstr[CURL_ERROR_SIZE];
40
41 static int curl_ssl_verify = -1;
42 static int curl_ssl_try;
43 static const char *ssl_cert;
44 static const char *ssl_cipherlist;
45 static const char *ssl_version;
46 static struct {
47 const char *name;
48 long ssl_version;
49 } sslversions[] = {
50 { "sslv2", CURL_SSLVERSION_SSLv2 },
51 { "sslv3", CURL_SSLVERSION_SSLv3 },
52 { "tlsv1", CURL_SSLVERSION_TLSv1 },
53 #if LIBCURL_VERSION_NUM >= 0x072200
54 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
55 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
56 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
57 #endif
58 };
59 #if LIBCURL_VERSION_NUM >= 0x070903
60 static const char *ssl_key;
61 #endif
62 #if LIBCURL_VERSION_NUM >= 0x070908
63 static const char *ssl_capath;
64 #endif
65 #if LIBCURL_VERSION_NUM >= 0x072c00
66 static const char *ssl_pinnedkey;
67 #endif
68 static const char *ssl_cainfo;
69 static long curl_low_speed_limit = -1;
70 static long curl_low_speed_time = -1;
71 static int curl_ftp_no_epsv;
72 static const char *curl_http_proxy;
73 static const char *curl_no_proxy;
74 static const char *http_proxy_authmethod;
75 static struct {
76 const char *name;
77 long curlauth_param;
78 } proxy_authmethods[] = {
79 { "basic", CURLAUTH_BASIC },
80 { "digest", CURLAUTH_DIGEST },
81 { "negotiate", CURLAUTH_GSSNEGOTIATE },
82 { "ntlm", CURLAUTH_NTLM },
83 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
84 { "anyauth", CURLAUTH_ANY },
85 #endif
86 /*
87 * CURLAUTH_DIGEST_IE has no corresponding command-line option in
88 * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
89 * here, too
90 */
91 };
92 static struct credential proxy_auth = CREDENTIAL_INIT;
93 static const char *curl_proxyuserpwd;
94 static const char *curl_cookie_file;
95 static int curl_save_cookies;
96 struct credential http_auth = CREDENTIAL_INIT;
97 static int http_proactive_auth;
98 static const char *user_agent;
99 static int curl_empty_auth;
100
101 #if LIBCURL_VERSION_NUM >= 0x071700
102 /* Use CURLOPT_KEYPASSWD as is */
103 #elif LIBCURL_VERSION_NUM >= 0x070903
104 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
105 #else
106 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
107 #endif
108
109 static struct credential cert_auth = CREDENTIAL_INIT;
110 static int ssl_cert_password_required;
111 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
112 static unsigned long http_auth_methods = CURLAUTH_ANY;
113 #endif
114
115 static struct curl_slist *pragma_header;
116 static struct curl_slist *no_pragma_header;
117
118 static struct active_request_slot *active_queue_head;
119
120 static char *cached_accept_language;
121
122 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
123 {
124 size_t size = eltsize * nmemb;
125 struct buffer *buffer = buffer_;
126
127 if (size > buffer->buf.len - buffer->posn)
128 size = buffer->buf.len - buffer->posn;
129 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
130 buffer->posn += size;
131
132 return size;
133 }
134
135 #ifndef NO_CURL_IOCTL
136 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
137 {
138 struct buffer *buffer = clientp;
139
140 switch (cmd) {
141 case CURLIOCMD_NOP:
142 return CURLIOE_OK;
143
144 case CURLIOCMD_RESTARTREAD:
145 buffer->posn = 0;
146 return CURLIOE_OK;
147
148 default:
149 return CURLIOE_UNKNOWNCMD;
150 }
151 }
152 #endif
153
154 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
155 {
156 size_t size = eltsize * nmemb;
157 struct strbuf *buffer = buffer_;
158
159 strbuf_add(buffer, ptr, size);
160 return size;
161 }
162
163 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
164 {
165 return eltsize * nmemb;
166 }
167
168 static void closedown_active_slot(struct active_request_slot *slot)
169 {
170 active_requests--;
171 slot->in_use = 0;
172 }
173
174 static void finish_active_slot(struct active_request_slot *slot)
175 {
176 closedown_active_slot(slot);
177 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
178
179 if (slot->finished != NULL)
180 (*slot->finished) = 1;
181
182 /* Store slot results so they can be read after the slot is reused */
183 if (slot->results != NULL) {
184 slot->results->curl_result = slot->curl_result;
185 slot->results->http_code = slot->http_code;
186 #if LIBCURL_VERSION_NUM >= 0x070a08
187 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
188 &slot->results->auth_avail);
189 #else
190 slot->results->auth_avail = 0;
191 #endif
192
193 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
194 &slot->results->http_connectcode);
195 }
196
197 /* Run callback if appropriate */
198 if (slot->callback_func != NULL)
199 slot->callback_func(slot->callback_data);
200 }
201
202 #ifdef USE_CURL_MULTI
203 static void process_curl_messages(void)
204 {
205 int num_messages;
206 struct active_request_slot *slot;
207 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
208
209 while (curl_message != NULL) {
210 if (curl_message->msg == CURLMSG_DONE) {
211 int curl_result = curl_message->data.result;
212 slot = active_queue_head;
213 while (slot != NULL &&
214 slot->curl != curl_message->easy_handle)
215 slot = slot->next;
216 if (slot != NULL) {
217 curl_multi_remove_handle(curlm, slot->curl);
218 slot->curl_result = curl_result;
219 finish_active_slot(slot);
220 } else {
221 fprintf(stderr, "Received DONE message for unknown request!\n");
222 }
223 } else {
224 fprintf(stderr, "Unknown CURL message received: %d\n",
225 (int)curl_message->msg);
226 }
227 curl_message = curl_multi_info_read(curlm, &num_messages);
228 }
229 }
230 #endif
231
232 static int http_options(const char *var, const char *value, void *cb)
233 {
234 if (!strcmp("http.sslverify", var)) {
235 curl_ssl_verify = git_config_bool(var, value);
236 return 0;
237 }
238 if (!strcmp("http.sslcipherlist", var))
239 return git_config_string(&ssl_cipherlist, var, value);
240 if (!strcmp("http.sslversion", var))
241 return git_config_string(&ssl_version, var, value);
242 if (!strcmp("http.sslcert", var))
243 return git_config_string(&ssl_cert, var, value);
244 #if LIBCURL_VERSION_NUM >= 0x070903
245 if (!strcmp("http.sslkey", var))
246 return git_config_string(&ssl_key, var, value);
247 #endif
248 #if LIBCURL_VERSION_NUM >= 0x070908
249 if (!strcmp("http.sslcapath", var))
250 return git_config_pathname(&ssl_capath, var, value);
251 #endif
252 if (!strcmp("http.sslcainfo", var))
253 return git_config_pathname(&ssl_cainfo, var, value);
254 if (!strcmp("http.sslcertpasswordprotected", var)) {
255 ssl_cert_password_required = git_config_bool(var, value);
256 return 0;
257 }
258 if (!strcmp("http.ssltry", var)) {
259 curl_ssl_try = git_config_bool(var, value);
260 return 0;
261 }
262 if (!strcmp("http.minsessions", var)) {
263 min_curl_sessions = git_config_int(var, value);
264 #ifndef USE_CURL_MULTI
265 if (min_curl_sessions > 1)
266 min_curl_sessions = 1;
267 #endif
268 return 0;
269 }
270 #ifdef USE_CURL_MULTI
271 if (!strcmp("http.maxrequests", var)) {
272 max_requests = git_config_int(var, value);
273 return 0;
274 }
275 #endif
276 if (!strcmp("http.lowspeedlimit", var)) {
277 curl_low_speed_limit = (long)git_config_int(var, value);
278 return 0;
279 }
280 if (!strcmp("http.lowspeedtime", var)) {
281 curl_low_speed_time = (long)git_config_int(var, value);
282 return 0;
283 }
284
285 if (!strcmp("http.noepsv", var)) {
286 curl_ftp_no_epsv = git_config_bool(var, value);
287 return 0;
288 }
289 if (!strcmp("http.proxy", var))
290 return git_config_string(&curl_http_proxy, var, value);
291
292 if (!strcmp("http.proxyauthmethod", var))
293 return git_config_string(&http_proxy_authmethod, var, value);
294
295 if (!strcmp("http.cookiefile", var))
296 return git_config_string(&curl_cookie_file, var, value);
297 if (!strcmp("http.savecookies", var)) {
298 curl_save_cookies = git_config_bool(var, value);
299 return 0;
300 }
301
302 if (!strcmp("http.postbuffer", var)) {
303 http_post_buffer = git_config_int(var, value);
304 if (http_post_buffer < LARGE_PACKET_MAX)
305 http_post_buffer = LARGE_PACKET_MAX;
306 return 0;
307 }
308
309 if (!strcmp("http.useragent", var))
310 return git_config_string(&user_agent, var, value);
311
312 if (!strcmp("http.emptyauth", var)) {
313 curl_empty_auth = git_config_bool(var, value);
314 return 0;
315 }
316
317 if (!strcmp("http.pinnedpubkey", var)) {
318 #if LIBCURL_VERSION_NUM >= 0x072c00
319 return git_config_pathname(&ssl_pinnedkey, var, value);
320 #else
321 warning(_("Public key pinning not supported with cURL < 7.44.0"));
322 return 0;
323 #endif
324 }
325
326 /* Fall back on the default ones */
327 return git_default_config(var, value, cb);
328 }
329
330 static void init_curl_http_auth(CURL *result)
331 {
332 if (!http_auth.username) {
333 if (curl_empty_auth)
334 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
335 return;
336 }
337
338 credential_fill(&http_auth);
339
340 #if LIBCURL_VERSION_NUM >= 0x071301
341 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
342 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
343 #else
344 {
345 static struct strbuf up = STRBUF_INIT;
346 /*
347 * Note that we assume we only ever have a single set of
348 * credentials in a given program run, so we do not have
349 * to worry about updating this buffer, only setting its
350 * initial value.
351 */
352 if (!up.len)
353 strbuf_addf(&up, "%s:%s",
354 http_auth.username, http_auth.password);
355 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
356 }
357 #endif
358 }
359
360 /* *var must be free-able */
361 static void var_override(const char **var, char *value)
362 {
363 if (value) {
364 free((void *)*var);
365 *var = xstrdup(value);
366 }
367 }
368
369 static void set_proxyauth_name_password(CURL *result)
370 {
371 #if LIBCURL_VERSION_NUM >= 0x071301
372 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
373 proxy_auth.username);
374 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
375 proxy_auth.password);
376 #else
377 struct strbuf s = STRBUF_INIT;
378
379 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
380 strbuf_addch(&s, ':');
381 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
382 curl_proxyuserpwd = strbuf_detach(&s, NULL);
383 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
384 #endif
385 }
386
387 static void init_curl_proxy_auth(CURL *result)
388 {
389 if (proxy_auth.username) {
390 if (!proxy_auth.password)
391 credential_fill(&proxy_auth);
392 set_proxyauth_name_password(result);
393 }
394
395 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
396
397 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
398 if (http_proxy_authmethod) {
399 int i;
400 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
401 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
402 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
403 proxy_authmethods[i].curlauth_param);
404 break;
405 }
406 }
407 if (i == ARRAY_SIZE(proxy_authmethods)) {
408 warning("unsupported proxy authentication method %s: using anyauth",
409 http_proxy_authmethod);
410 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
411 }
412 }
413 else
414 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
415 #endif
416 }
417
418 static int has_cert_password(void)
419 {
420 if (ssl_cert == NULL || ssl_cert_password_required != 1)
421 return 0;
422 if (!cert_auth.password) {
423 cert_auth.protocol = xstrdup("cert");
424 cert_auth.username = xstrdup("");
425 cert_auth.path = xstrdup(ssl_cert);
426 credential_fill(&cert_auth);
427 }
428 return 1;
429 }
430
431 #if LIBCURL_VERSION_NUM >= 0x071900
432 static void set_curl_keepalive(CURL *c)
433 {
434 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
435 }
436
437 #elif LIBCURL_VERSION_NUM >= 0x071000
438 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
439 {
440 int ka = 1;
441 int rc;
442 socklen_t len = (socklen_t)sizeof(ka);
443
444 if (type != CURLSOCKTYPE_IPCXN)
445 return 0;
446
447 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
448 if (rc < 0)
449 warning_errno("unable to set SO_KEEPALIVE on socket");
450
451 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
452 }
453
454 static void set_curl_keepalive(CURL *c)
455 {
456 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
457 }
458
459 #else
460 static void set_curl_keepalive(CURL *c)
461 {
462 /* not supported on older curl versions */
463 }
464 #endif
465
466 static CURL *get_curl_handle(void)
467 {
468 CURL *result = curl_easy_init();
469 long allowed_protocols = 0;
470
471 if (!result)
472 die("curl_easy_init failed");
473
474 if (!curl_ssl_verify) {
475 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
476 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
477 } else {
478 /* Verify authenticity of the peer's certificate */
479 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
480 /* The name in the cert must match whom we tried to connect */
481 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
482 }
483
484 #if LIBCURL_VERSION_NUM >= 0x070907
485 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
486 #endif
487 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
488 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
489 #endif
490
491 if (http_proactive_auth)
492 init_curl_http_auth(result);
493
494 if (getenv("GIT_SSL_VERSION"))
495 ssl_version = getenv("GIT_SSL_VERSION");
496 if (ssl_version && *ssl_version) {
497 int i;
498 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
499 if (!strcmp(ssl_version, sslversions[i].name)) {
500 curl_easy_setopt(result, CURLOPT_SSLVERSION,
501 sslversions[i].ssl_version);
502 break;
503 }
504 }
505 if (i == ARRAY_SIZE(sslversions))
506 warning("unsupported ssl version %s: using default",
507 ssl_version);
508 }
509
510 if (getenv("GIT_SSL_CIPHER_LIST"))
511 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
512 if (ssl_cipherlist != NULL && *ssl_cipherlist)
513 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
514 ssl_cipherlist);
515
516 if (ssl_cert != NULL)
517 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
518 if (has_cert_password())
519 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
520 #if LIBCURL_VERSION_NUM >= 0x070903
521 if (ssl_key != NULL)
522 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
523 #endif
524 #if LIBCURL_VERSION_NUM >= 0x070908
525 if (ssl_capath != NULL)
526 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
527 #endif
528 #if LIBCURL_VERSION_NUM >= 0x072c00
529 if (ssl_pinnedkey != NULL)
530 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
531 #endif
532 if (ssl_cainfo != NULL)
533 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
534
535 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
536 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
537 curl_low_speed_limit);
538 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
539 curl_low_speed_time);
540 }
541
542 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
543 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
544 #if LIBCURL_VERSION_NUM >= 0x071301
545 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
546 #elif LIBCURL_VERSION_NUM >= 0x071101
547 curl_easy_setopt(result, CURLOPT_POST301, 1);
548 #endif
549 #if LIBCURL_VERSION_NUM >= 0x071304
550 if (is_transport_allowed("http"))
551 allowed_protocols |= CURLPROTO_HTTP;
552 if (is_transport_allowed("https"))
553 allowed_protocols |= CURLPROTO_HTTPS;
554 if (is_transport_allowed("ftp"))
555 allowed_protocols |= CURLPROTO_FTP;
556 if (is_transport_allowed("ftps"))
557 allowed_protocols |= CURLPROTO_FTPS;
558 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
559 #else
560 if (transport_restrict_protocols())
561 warning("protocol restrictions not applied to curl redirects because\n"
562 "your curl version is too old (>= 7.19.4)");
563 #endif
564
565 if (getenv("GIT_CURL_VERBOSE"))
566 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
567
568 curl_easy_setopt(result, CURLOPT_USERAGENT,
569 user_agent ? user_agent : git_user_agent());
570
571 if (curl_ftp_no_epsv)
572 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
573
574 #ifdef CURLOPT_USE_SSL
575 if (curl_ssl_try)
576 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
577 #endif
578
579 /*
580 * CURL also examines these variables as a fallback; but we need to query
581 * them here in order to decide whether to prompt for missing password (cf.
582 * init_curl_proxy_auth()).
583 *
584 * Unlike many other common environment variables, these are historically
585 * lowercase only. It appears that CURL did not know this and implemented
586 * only uppercase variants, which was later corrected to take both - with
587 * the exception of http_proxy, which is lowercase only also in CURL. As
588 * the lowercase versions are the historical quasi-standard, they take
589 * precedence here, as in CURL.
590 */
591 if (!curl_http_proxy) {
592 if (!strcmp(http_auth.protocol, "https")) {
593 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
594 var_override(&curl_http_proxy, getenv("https_proxy"));
595 } else {
596 var_override(&curl_http_proxy, getenv("http_proxy"));
597 }
598 if (!curl_http_proxy) {
599 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
600 var_override(&curl_http_proxy, getenv("all_proxy"));
601 }
602 }
603
604 if (curl_http_proxy) {
605 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
606 #if LIBCURL_VERSION_NUM >= 0x071800
607 if (starts_with(curl_http_proxy, "socks5"))
608 curl_easy_setopt(result,
609 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
610 else if (starts_with(curl_http_proxy, "socks4a"))
611 curl_easy_setopt(result,
612 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
613 else if (starts_with(curl_http_proxy, "socks"))
614 curl_easy_setopt(result,
615 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
616 #endif
617 if (strstr(curl_http_proxy, "://"))
618 credential_from_url(&proxy_auth, curl_http_proxy);
619 else {
620 struct strbuf url = STRBUF_INIT;
621 strbuf_addf(&url, "http://%s", curl_http_proxy);
622 credential_from_url(&proxy_auth, url.buf);
623 strbuf_release(&url);
624 }
625
626 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
627 #if LIBCURL_VERSION_NUM >= 0x071304
628 var_override(&curl_no_proxy, getenv("NO_PROXY"));
629 var_override(&curl_no_proxy, getenv("no_proxy"));
630 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
631 #endif
632 }
633 init_curl_proxy_auth(result);
634
635 set_curl_keepalive(result);
636
637 return result;
638 }
639
640 static void set_from_env(const char **var, const char *envname)
641 {
642 const char *val = getenv(envname);
643 if (val)
644 *var = val;
645 }
646
647 void http_init(struct remote *remote, const char *url, int proactive_auth)
648 {
649 char *low_speed_limit;
650 char *low_speed_time;
651 char *normalized_url;
652 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
653
654 config.section = "http";
655 config.key = NULL;
656 config.collect_fn = http_options;
657 config.cascade_fn = git_default_config;
658 config.cb = NULL;
659
660 http_is_verbose = 0;
661 normalized_url = url_normalize(url, &config.url);
662
663 git_config(urlmatch_config_entry, &config);
664 free(normalized_url);
665
666 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
667 die("curl_global_init failed");
668
669 http_proactive_auth = proactive_auth;
670
671 if (remote && remote->http_proxy)
672 curl_http_proxy = xstrdup(remote->http_proxy);
673
674 if (remote)
675 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
676
677 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
678 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
679
680 #ifdef USE_CURL_MULTI
681 {
682 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
683 if (http_max_requests != NULL)
684 max_requests = atoi(http_max_requests);
685 }
686
687 curlm = curl_multi_init();
688 if (!curlm)
689 die("curl_multi_init failed");
690 #endif
691
692 if (getenv("GIT_SSL_NO_VERIFY"))
693 curl_ssl_verify = 0;
694
695 set_from_env(&ssl_cert, "GIT_SSL_CERT");
696 #if LIBCURL_VERSION_NUM >= 0x070903
697 set_from_env(&ssl_key, "GIT_SSL_KEY");
698 #endif
699 #if LIBCURL_VERSION_NUM >= 0x070908
700 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
701 #endif
702 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
703
704 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
705
706 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
707 if (low_speed_limit != NULL)
708 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
709 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
710 if (low_speed_time != NULL)
711 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
712
713 if (curl_ssl_verify == -1)
714 curl_ssl_verify = 1;
715
716 curl_session_count = 0;
717 #ifdef USE_CURL_MULTI
718 if (max_requests < 1)
719 max_requests = DEFAULT_MAX_REQUESTS;
720 #endif
721
722 if (getenv("GIT_CURL_FTP_NO_EPSV"))
723 curl_ftp_no_epsv = 1;
724
725 if (url) {
726 credential_from_url(&http_auth, url);
727 if (!ssl_cert_password_required &&
728 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
729 starts_with(url, "https://"))
730 ssl_cert_password_required = 1;
731 }
732
733 #ifndef NO_CURL_EASY_DUPHANDLE
734 curl_default = get_curl_handle();
735 #endif
736 }
737
738 void http_cleanup(void)
739 {
740 struct active_request_slot *slot = active_queue_head;
741
742 while (slot != NULL) {
743 struct active_request_slot *next = slot->next;
744 if (slot->curl != NULL) {
745 #ifdef USE_CURL_MULTI
746 curl_multi_remove_handle(curlm, slot->curl);
747 #endif
748 curl_easy_cleanup(slot->curl);
749 }
750 free(slot);
751 slot = next;
752 }
753 active_queue_head = NULL;
754
755 #ifndef NO_CURL_EASY_DUPHANDLE
756 curl_easy_cleanup(curl_default);
757 #endif
758
759 #ifdef USE_CURL_MULTI
760 curl_multi_cleanup(curlm);
761 #endif
762 curl_global_cleanup();
763
764 curl_slist_free_all(pragma_header);
765 pragma_header = NULL;
766
767 curl_slist_free_all(no_pragma_header);
768 no_pragma_header = NULL;
769
770 if (curl_http_proxy) {
771 free((void *)curl_http_proxy);
772 curl_http_proxy = NULL;
773 }
774
775 if (proxy_auth.password) {
776 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
777 free(proxy_auth.password);
778 proxy_auth.password = NULL;
779 }
780
781 free((void *)curl_proxyuserpwd);
782 curl_proxyuserpwd = NULL;
783
784 free((void *)http_proxy_authmethod);
785 http_proxy_authmethod = NULL;
786
787 if (cert_auth.password != NULL) {
788 memset(cert_auth.password, 0, strlen(cert_auth.password));
789 free(cert_auth.password);
790 cert_auth.password = NULL;
791 }
792 ssl_cert_password_required = 0;
793
794 free(cached_accept_language);
795 cached_accept_language = NULL;
796 }
797
798 struct active_request_slot *get_active_slot(void)
799 {
800 struct active_request_slot *slot = active_queue_head;
801 struct active_request_slot *newslot;
802
803 #ifdef USE_CURL_MULTI
804 int num_transfers;
805
806 /* Wait for a slot to open up if the queue is full */
807 while (active_requests >= max_requests) {
808 curl_multi_perform(curlm, &num_transfers);
809 if (num_transfers < active_requests)
810 process_curl_messages();
811 }
812 #endif
813
814 while (slot != NULL && slot->in_use)
815 slot = slot->next;
816
817 if (slot == NULL) {
818 newslot = xmalloc(sizeof(*newslot));
819 newslot->curl = NULL;
820 newslot->in_use = 0;
821 newslot->next = NULL;
822
823 slot = active_queue_head;
824 if (slot == NULL) {
825 active_queue_head = newslot;
826 } else {
827 while (slot->next != NULL)
828 slot = slot->next;
829 slot->next = newslot;
830 }
831 slot = newslot;
832 }
833
834 if (slot->curl == NULL) {
835 #ifdef NO_CURL_EASY_DUPHANDLE
836 slot->curl = get_curl_handle();
837 #else
838 slot->curl = curl_easy_duphandle(curl_default);
839 #endif
840 curl_session_count++;
841 }
842
843 active_requests++;
844 slot->in_use = 1;
845 slot->results = NULL;
846 slot->finished = NULL;
847 slot->callback_data = NULL;
848 slot->callback_func = NULL;
849 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
850 if (curl_save_cookies)
851 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
852 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
853 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
854 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
855 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
856 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
857 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
858 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
859 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
860 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
861 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
862
863 #if LIBCURL_VERSION_NUM >= 0x070a08
864 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
865 #endif
866 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
867 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
868 #endif
869 if (http_auth.password || curl_empty_auth)
870 init_curl_http_auth(slot->curl);
871
872 return slot;
873 }
874
875 int start_active_slot(struct active_request_slot *slot)
876 {
877 #ifdef USE_CURL_MULTI
878 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
879 int num_transfers;
880
881 if (curlm_result != CURLM_OK &&
882 curlm_result != CURLM_CALL_MULTI_PERFORM) {
883 active_requests--;
884 slot->in_use = 0;
885 return 0;
886 }
887
888 /*
889 * We know there must be something to do, since we just added
890 * something.
891 */
892 curl_multi_perform(curlm, &num_transfers);
893 #endif
894 return 1;
895 }
896
897 #ifdef USE_CURL_MULTI
898 struct fill_chain {
899 void *data;
900 int (*fill)(void *);
901 struct fill_chain *next;
902 };
903
904 static struct fill_chain *fill_cfg;
905
906 void add_fill_function(void *data, int (*fill)(void *))
907 {
908 struct fill_chain *new = xmalloc(sizeof(*new));
909 struct fill_chain **linkp = &fill_cfg;
910 new->data = data;
911 new->fill = fill;
912 new->next = NULL;
913 while (*linkp)
914 linkp = &(*linkp)->next;
915 *linkp = new;
916 }
917
918 void fill_active_slots(void)
919 {
920 struct active_request_slot *slot = active_queue_head;
921
922 while (active_requests < max_requests) {
923 struct fill_chain *fill;
924 for (fill = fill_cfg; fill; fill = fill->next)
925 if (fill->fill(fill->data))
926 break;
927
928 if (!fill)
929 break;
930 }
931
932 while (slot != NULL) {
933 if (!slot->in_use && slot->curl != NULL
934 && curl_session_count > min_curl_sessions) {
935 curl_easy_cleanup(slot->curl);
936 slot->curl = NULL;
937 curl_session_count--;
938 }
939 slot = slot->next;
940 }
941 }
942
943 void step_active_slots(void)
944 {
945 int num_transfers;
946 CURLMcode curlm_result;
947
948 do {
949 curlm_result = curl_multi_perform(curlm, &num_transfers);
950 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
951 if (num_transfers < active_requests) {
952 process_curl_messages();
953 fill_active_slots();
954 }
955 }
956 #endif
957
958 void run_active_slot(struct active_request_slot *slot)
959 {
960 #ifdef USE_CURL_MULTI
961 fd_set readfds;
962 fd_set writefds;
963 fd_set excfds;
964 int max_fd;
965 struct timeval select_timeout;
966 int finished = 0;
967
968 slot->finished = &finished;
969 while (!finished) {
970 step_active_slots();
971
972 if (slot->in_use) {
973 #if LIBCURL_VERSION_NUM >= 0x070f04
974 long curl_timeout;
975 curl_multi_timeout(curlm, &curl_timeout);
976 if (curl_timeout == 0) {
977 continue;
978 } else if (curl_timeout == -1) {
979 select_timeout.tv_sec = 0;
980 select_timeout.tv_usec = 50000;
981 } else {
982 select_timeout.tv_sec = curl_timeout / 1000;
983 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
984 }
985 #else
986 select_timeout.tv_sec = 0;
987 select_timeout.tv_usec = 50000;
988 #endif
989
990 max_fd = -1;
991 FD_ZERO(&readfds);
992 FD_ZERO(&writefds);
993 FD_ZERO(&excfds);
994 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
995
996 /*
997 * It can happen that curl_multi_timeout returns a pathologically
998 * long timeout when curl_multi_fdset returns no file descriptors
999 * to read. See commit message for more details.
1000 */
1001 if (max_fd < 0 &&
1002 (select_timeout.tv_sec > 0 ||
1003 select_timeout.tv_usec > 50000)) {
1004 select_timeout.tv_sec = 0;
1005 select_timeout.tv_usec = 50000;
1006 }
1007
1008 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1009 }
1010 }
1011 #else
1012 while (slot->in_use) {
1013 slot->curl_result = curl_easy_perform(slot->curl);
1014 finish_active_slot(slot);
1015 }
1016 #endif
1017 }
1018
1019 static void release_active_slot(struct active_request_slot *slot)
1020 {
1021 closedown_active_slot(slot);
1022 if (slot->curl && curl_session_count > min_curl_sessions) {
1023 #ifdef USE_CURL_MULTI
1024 curl_multi_remove_handle(curlm, slot->curl);
1025 #endif
1026 curl_easy_cleanup(slot->curl);
1027 slot->curl = NULL;
1028 curl_session_count--;
1029 }
1030 #ifdef USE_CURL_MULTI
1031 fill_active_slots();
1032 #endif
1033 }
1034
1035 void finish_all_active_slots(void)
1036 {
1037 struct active_request_slot *slot = active_queue_head;
1038
1039 while (slot != NULL)
1040 if (slot->in_use) {
1041 run_active_slot(slot);
1042 slot = active_queue_head;
1043 } else {
1044 slot = slot->next;
1045 }
1046 }
1047
1048 /* Helpers for modifying and creating URLs */
1049 static inline int needs_quote(int ch)
1050 {
1051 if (((ch >= 'A') && (ch <= 'Z'))
1052 || ((ch >= 'a') && (ch <= 'z'))
1053 || ((ch >= '0') && (ch <= '9'))
1054 || (ch == '/')
1055 || (ch == '-')
1056 || (ch == '.'))
1057 return 0;
1058 return 1;
1059 }
1060
1061 static char *quote_ref_url(const char *base, const char *ref)
1062 {
1063 struct strbuf buf = STRBUF_INIT;
1064 const char *cp;
1065 int ch;
1066
1067 end_url_with_slash(&buf, base);
1068
1069 for (cp = ref; (ch = *cp) != 0; cp++)
1070 if (needs_quote(ch))
1071 strbuf_addf(&buf, "%%%02x", ch);
1072 else
1073 strbuf_addch(&buf, *cp);
1074
1075 return strbuf_detach(&buf, NULL);
1076 }
1077
1078 void append_remote_object_url(struct strbuf *buf, const char *url,
1079 const char *hex,
1080 int only_two_digit_prefix)
1081 {
1082 end_url_with_slash(buf, url);
1083
1084 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1085 if (!only_two_digit_prefix)
1086 strbuf_addf(buf, "%s", hex+2);
1087 }
1088
1089 char *get_remote_object_url(const char *url, const char *hex,
1090 int only_two_digit_prefix)
1091 {
1092 struct strbuf buf = STRBUF_INIT;
1093 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1094 return strbuf_detach(&buf, NULL);
1095 }
1096
1097 static int handle_curl_result(struct slot_results *results)
1098 {
1099 /*
1100 * If we see a failing http code with CURLE_OK, we have turned off
1101 * FAILONERROR (to keep the server's custom error response), and should
1102 * translate the code into failure here.
1103 */
1104 if (results->curl_result == CURLE_OK &&
1105 results->http_code >= 400) {
1106 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1107 /*
1108 * Normally curl will already have put the "reason phrase"
1109 * from the server into curl_errorstr; unfortunately without
1110 * FAILONERROR it is lost, so we can give only the numeric
1111 * status code.
1112 */
1113 snprintf(curl_errorstr, sizeof(curl_errorstr),
1114 "The requested URL returned error: %ld",
1115 results->http_code);
1116 }
1117
1118 if (results->curl_result == CURLE_OK) {
1119 credential_approve(&http_auth);
1120 if (proxy_auth.password)
1121 credential_approve(&proxy_auth);
1122 return HTTP_OK;
1123 } else if (missing_target(results))
1124 return HTTP_MISSING_TARGET;
1125 else if (results->http_code == 401) {
1126 if (http_auth.username && http_auth.password) {
1127 credential_reject(&http_auth);
1128 return HTTP_NOAUTH;
1129 } else {
1130 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1131 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1132 #endif
1133 return HTTP_REAUTH;
1134 }
1135 } else {
1136 if (results->http_connectcode == 407)
1137 credential_reject(&proxy_auth);
1138 #if LIBCURL_VERSION_NUM >= 0x070c00
1139 if (!curl_errorstr[0])
1140 strlcpy(curl_errorstr,
1141 curl_easy_strerror(results->curl_result),
1142 sizeof(curl_errorstr));
1143 #endif
1144 return HTTP_ERROR;
1145 }
1146 }
1147
1148 int run_one_slot(struct active_request_slot *slot,
1149 struct slot_results *results)
1150 {
1151 slot->results = results;
1152 if (!start_active_slot(slot)) {
1153 snprintf(curl_errorstr, sizeof(curl_errorstr),
1154 "failed to start HTTP request");
1155 return HTTP_START_FAILED;
1156 }
1157
1158 run_active_slot(slot);
1159 return handle_curl_result(results);
1160 }
1161
1162 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1163 {
1164 char *ptr;
1165 CURLcode ret;
1166
1167 strbuf_reset(buf);
1168 ret = curl_easy_getinfo(curl, info, &ptr);
1169 if (!ret && ptr)
1170 strbuf_addstr(buf, ptr);
1171 return ret;
1172 }
1173
1174 /*
1175 * Check for and extract a content-type parameter. "raw"
1176 * should be positioned at the start of the potential
1177 * parameter, with any whitespace already removed.
1178 *
1179 * "name" is the name of the parameter. The value is appended
1180 * to "out".
1181 */
1182 static int extract_param(const char *raw, const char *name,
1183 struct strbuf *out)
1184 {
1185 size_t len = strlen(name);
1186
1187 if (strncasecmp(raw, name, len))
1188 return -1;
1189 raw += len;
1190
1191 if (*raw != '=')
1192 return -1;
1193 raw++;
1194
1195 while (*raw && !isspace(*raw) && *raw != ';')
1196 strbuf_addch(out, *raw++);
1197 return 0;
1198 }
1199
1200 /*
1201 * Extract a normalized version of the content type, with any
1202 * spaces suppressed, all letters lowercased, and no trailing ";"
1203 * or parameters.
1204 *
1205 * Note that we will silently remove even invalid whitespace. For
1206 * example, "text / plain" is specifically forbidden by RFC 2616,
1207 * but "text/plain" is the only reasonable output, and this keeps
1208 * our code simple.
1209 *
1210 * If the "charset" argument is not NULL, store the value of any
1211 * charset parameter there.
1212 *
1213 * Example:
1214 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1215 * "text / plain" -> "text/plain"
1216 */
1217 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1218 struct strbuf *charset)
1219 {
1220 const char *p;
1221
1222 strbuf_reset(type);
1223 strbuf_grow(type, raw->len);
1224 for (p = raw->buf; *p; p++) {
1225 if (isspace(*p))
1226 continue;
1227 if (*p == ';') {
1228 p++;
1229 break;
1230 }
1231 strbuf_addch(type, tolower(*p));
1232 }
1233
1234 if (!charset)
1235 return;
1236
1237 strbuf_reset(charset);
1238 while (*p) {
1239 while (isspace(*p) || *p == ';')
1240 p++;
1241 if (!extract_param(p, "charset", charset))
1242 return;
1243 while (*p && !isspace(*p))
1244 p++;
1245 }
1246
1247 if (!charset->len && starts_with(type->buf, "text/"))
1248 strbuf_addstr(charset, "ISO-8859-1");
1249 }
1250
1251 static void write_accept_language(struct strbuf *buf)
1252 {
1253 /*
1254 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1255 * that, q-value will be smaller than 0.001, the minimum q-value the
1256 * HTTP specification allows. See
1257 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1258 */
1259 const int MAX_DECIMAL_PLACES = 3;
1260 const int MAX_LANGUAGE_TAGS = 1000;
1261 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1262 char **language_tags = NULL;
1263 int num_langs = 0;
1264 const char *s = get_preferred_languages();
1265 int i;
1266 struct strbuf tag = STRBUF_INIT;
1267
1268 /* Don't add Accept-Language header if no language is preferred. */
1269 if (!s)
1270 return;
1271
1272 /*
1273 * Split the colon-separated string of preferred languages into
1274 * language_tags array.
1275 */
1276 do {
1277 /* collect language tag */
1278 for (; *s && (isalnum(*s) || *s == '_'); s++)
1279 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1280
1281 /* skip .codeset, @modifier and any other unnecessary parts */
1282 while (*s && *s != ':')
1283 s++;
1284
1285 if (tag.len) {
1286 num_langs++;
1287 REALLOC_ARRAY(language_tags, num_langs);
1288 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1289 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1290 break;
1291 }
1292 } while (*s++);
1293
1294 /* write Accept-Language header into buf */
1295 if (num_langs) {
1296 int last_buf_len = 0;
1297 int max_q;
1298 int decimal_places;
1299 char q_format[32];
1300
1301 /* add '*' */
1302 REALLOC_ARRAY(language_tags, num_langs + 1);
1303 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1304
1305 /* compute decimal_places */
1306 for (max_q = 1, decimal_places = 0;
1307 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1308 decimal_places++, max_q *= 10)
1309 ;
1310
1311 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1312
1313 strbuf_addstr(buf, "Accept-Language: ");
1314
1315 for (i = 0; i < num_langs; i++) {
1316 if (i > 0)
1317 strbuf_addstr(buf, ", ");
1318
1319 strbuf_addstr(buf, language_tags[i]);
1320
1321 if (i > 0)
1322 strbuf_addf(buf, q_format, max_q - i);
1323
1324 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1325 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1326 break;
1327 }
1328
1329 last_buf_len = buf->len;
1330 }
1331 }
1332
1333 /* free language tags -- last one is a static '*' */
1334 for (i = 0; i < num_langs - 1; i++)
1335 free(language_tags[i]);
1336 free(language_tags);
1337 }
1338
1339 /*
1340 * Get an Accept-Language header which indicates user's preferred languages.
1341 *
1342 * Examples:
1343 * LANGUAGE= -> ""
1344 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1345 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1346 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1347 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1348 * LANGUAGE= LANG=C -> ""
1349 */
1350 static const char *get_accept_language(void)
1351 {
1352 if (!cached_accept_language) {
1353 struct strbuf buf = STRBUF_INIT;
1354 write_accept_language(&buf);
1355 if (buf.len > 0)
1356 cached_accept_language = strbuf_detach(&buf, NULL);
1357 }
1358
1359 return cached_accept_language;
1360 }
1361
1362 static void http_opt_request_remainder(CURL *curl, off_t pos)
1363 {
1364 char buf[128];
1365 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1366 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1367 }
1368
1369 /* http_request() targets */
1370 #define HTTP_REQUEST_STRBUF 0
1371 #define HTTP_REQUEST_FILE 1
1372
1373 static int http_request(const char *url,
1374 void *result, int target,
1375 const struct http_get_options *options)
1376 {
1377 struct active_request_slot *slot;
1378 struct slot_results results;
1379 struct curl_slist *headers = NULL;
1380 struct strbuf buf = STRBUF_INIT;
1381 const char *accept_language;
1382 int ret;
1383
1384 slot = get_active_slot();
1385 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1386
1387 if (result == NULL) {
1388 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1389 } else {
1390 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1391 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1392
1393 if (target == HTTP_REQUEST_FILE) {
1394 off_t posn = ftello(result);
1395 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1396 fwrite);
1397 if (posn > 0)
1398 http_opt_request_remainder(slot->curl, posn);
1399 } else
1400 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1401 fwrite_buffer);
1402 }
1403
1404 accept_language = get_accept_language();
1405
1406 if (accept_language)
1407 headers = curl_slist_append(headers, accept_language);
1408
1409 strbuf_addstr(&buf, "Pragma:");
1410 if (options && options->no_cache)
1411 strbuf_addstr(&buf, " no-cache");
1412 if (options && options->keep_error)
1413 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1414
1415 headers = curl_slist_append(headers, buf.buf);
1416
1417 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1418 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1419 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1420
1421 ret = run_one_slot(slot, &results);
1422
1423 if (options && options->content_type) {
1424 struct strbuf raw = STRBUF_INIT;
1425 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1426 extract_content_type(&raw, options->content_type,
1427 options->charset);
1428 strbuf_release(&raw);
1429 }
1430
1431 if (options && options->effective_url)
1432 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1433 options->effective_url);
1434
1435 curl_slist_free_all(headers);
1436 strbuf_release(&buf);
1437
1438 return ret;
1439 }
1440
1441 /*
1442 * Update the "base" url to a more appropriate value, as deduced by
1443 * redirects seen when requesting a URL starting with "url".
1444 *
1445 * The "asked" parameter is a URL that we asked curl to access, and must begin
1446 * with "base".
1447 *
1448 * The "got" parameter is the URL that curl reported to us as where we ended
1449 * up.
1450 *
1451 * Returns 1 if we updated the base url, 0 otherwise.
1452 *
1453 * Our basic strategy is to compare "base" and "asked" to find the bits
1454 * specific to our request. We then strip those bits off of "got" to yield the
1455 * new base. So for example, if our base is "http://example.com/foo.git",
1456 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1457 * with "https://other.example.com/foo.git/info/refs". We would want the
1458 * new URL to become "https://other.example.com/foo.git".
1459 *
1460 * Note that this assumes a sane redirect scheme. It's entirely possible
1461 * in the example above to end up at a URL that does not even end in
1462 * "info/refs". In such a case we simply punt, as there is not much we can
1463 * do (and such a scheme is unlikely to represent a real git repository,
1464 * which means we are likely about to abort anyway).
1465 */
1466 static int update_url_from_redirect(struct strbuf *base,
1467 const char *asked,
1468 const struct strbuf *got)
1469 {
1470 const char *tail;
1471 size_t tail_len;
1472
1473 if (!strcmp(asked, got->buf))
1474 return 0;
1475
1476 if (!skip_prefix(asked, base->buf, &tail))
1477 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1478 asked, base->buf);
1479
1480 tail_len = strlen(tail);
1481
1482 if (got->len < tail_len ||
1483 strcmp(tail, got->buf + got->len - tail_len))
1484 return 0; /* insane redirect scheme */
1485
1486 strbuf_reset(base);
1487 strbuf_add(base, got->buf, got->len - tail_len);
1488 return 1;
1489 }
1490
1491 static int http_request_reauth(const char *url,
1492 void *result, int target,
1493 struct http_get_options *options)
1494 {
1495 int ret = http_request(url, result, target, options);
1496
1497 if (options && options->effective_url && options->base_url) {
1498 if (update_url_from_redirect(options->base_url,
1499 url, options->effective_url)) {
1500 credential_from_url(&http_auth, options->base_url->buf);
1501 url = options->effective_url->buf;
1502 }
1503 }
1504
1505 if (ret != HTTP_REAUTH)
1506 return ret;
1507
1508 /*
1509 * If we are using KEEP_ERROR, the previous request may have
1510 * put cruft into our output stream; we should clear it out before
1511 * making our next request. We only know how to do this for
1512 * the strbuf case, but that is enough to satisfy current callers.
1513 */
1514 if (options && options->keep_error) {
1515 switch (target) {
1516 case HTTP_REQUEST_STRBUF:
1517 strbuf_reset(result);
1518 break;
1519 default:
1520 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1521 }
1522 }
1523
1524 credential_fill(&http_auth);
1525
1526 return http_request(url, result, target, options);
1527 }
1528
1529 int http_get_strbuf(const char *url,
1530 struct strbuf *result,
1531 struct http_get_options *options)
1532 {
1533 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1534 }
1535
1536 /*
1537 * Downloads a URL and stores the result in the given file.
1538 *
1539 * If a previous interrupted download is detected (i.e. a previous temporary
1540 * file is still around) the download is resumed.
1541 */
1542 static int http_get_file(const char *url, const char *filename,
1543 struct http_get_options *options)
1544 {
1545 int ret;
1546 struct strbuf tmpfile = STRBUF_INIT;
1547 FILE *result;
1548
1549 strbuf_addf(&tmpfile, "%s.temp", filename);
1550 result = fopen(tmpfile.buf, "a");
1551 if (!result) {
1552 error("Unable to open local file %s", tmpfile.buf);
1553 ret = HTTP_ERROR;
1554 goto cleanup;
1555 }
1556
1557 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1558 fclose(result);
1559
1560 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1561 ret = HTTP_ERROR;
1562 cleanup:
1563 strbuf_release(&tmpfile);
1564 return ret;
1565 }
1566
1567 int http_fetch_ref(const char *base, struct ref *ref)
1568 {
1569 struct http_get_options options = {0};
1570 char *url;
1571 struct strbuf buffer = STRBUF_INIT;
1572 int ret = -1;
1573
1574 options.no_cache = 1;
1575
1576 url = quote_ref_url(base, ref->name);
1577 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1578 strbuf_rtrim(&buffer);
1579 if (buffer.len == 40)
1580 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1581 else if (starts_with(buffer.buf, "ref: ")) {
1582 ref->symref = xstrdup(buffer.buf + 5);
1583 ret = 0;
1584 }
1585 }
1586
1587 strbuf_release(&buffer);
1588 free(url);
1589 return ret;
1590 }
1591
1592 /* Helpers for fetching packs */
1593 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1594 {
1595 char *url, *tmp;
1596 struct strbuf buf = STRBUF_INIT;
1597
1598 if (http_is_verbose)
1599 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1600
1601 end_url_with_slash(&buf, base_url);
1602 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1603 url = strbuf_detach(&buf, NULL);
1604
1605 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1606 tmp = strbuf_detach(&buf, NULL);
1607
1608 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1609 error("Unable to get pack index %s", url);
1610 free(tmp);
1611 tmp = NULL;
1612 }
1613
1614 free(url);
1615 return tmp;
1616 }
1617
1618 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1619 unsigned char *sha1, const char *base_url)
1620 {
1621 struct packed_git *new_pack;
1622 char *tmp_idx = NULL;
1623 int ret;
1624
1625 if (has_pack_index(sha1)) {
1626 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1627 if (!new_pack)
1628 return -1; /* parse_pack_index() already issued error message */
1629 goto add_pack;
1630 }
1631
1632 tmp_idx = fetch_pack_index(sha1, base_url);
1633 if (!tmp_idx)
1634 return -1;
1635
1636 new_pack = parse_pack_index(sha1, tmp_idx);
1637 if (!new_pack) {
1638 unlink(tmp_idx);
1639 free(tmp_idx);
1640
1641 return -1; /* parse_pack_index() already issued error message */
1642 }
1643
1644 ret = verify_pack_index(new_pack);
1645 if (!ret) {
1646 close_pack_index(new_pack);
1647 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1648 }
1649 free(tmp_idx);
1650 if (ret)
1651 return -1;
1652
1653 add_pack:
1654 new_pack->next = *packs_head;
1655 *packs_head = new_pack;
1656 return 0;
1657 }
1658
1659 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1660 {
1661 struct http_get_options options = {0};
1662 int ret = 0, i = 0;
1663 char *url, *data;
1664 struct strbuf buf = STRBUF_INIT;
1665 unsigned char sha1[20];
1666
1667 end_url_with_slash(&buf, base_url);
1668 strbuf_addstr(&buf, "objects/info/packs");
1669 url = strbuf_detach(&buf, NULL);
1670
1671 options.no_cache = 1;
1672 ret = http_get_strbuf(url, &buf, &options);
1673 if (ret != HTTP_OK)
1674 goto cleanup;
1675
1676 data = buf.buf;
1677 while (i < buf.len) {
1678 switch (data[i]) {
1679 case 'P':
1680 i++;
1681 if (i + 52 <= buf.len &&
1682 starts_with(data + i, " pack-") &&
1683 starts_with(data + i + 46, ".pack\n")) {
1684 get_sha1_hex(data + i + 6, sha1);
1685 fetch_and_setup_pack_index(packs_head, sha1,
1686 base_url);
1687 i += 51;
1688 break;
1689 }
1690 default:
1691 while (i < buf.len && data[i] != '\n')
1692 i++;
1693 }
1694 i++;
1695 }
1696
1697 cleanup:
1698 free(url);
1699 return ret;
1700 }
1701
1702 void release_http_pack_request(struct http_pack_request *preq)
1703 {
1704 if (preq->packfile != NULL) {
1705 fclose(preq->packfile);
1706 preq->packfile = NULL;
1707 }
1708 preq->slot = NULL;
1709 free(preq->url);
1710 free(preq);
1711 }
1712
1713 int finish_http_pack_request(struct http_pack_request *preq)
1714 {
1715 struct packed_git **lst;
1716 struct packed_git *p = preq->target;
1717 char *tmp_idx;
1718 size_t len;
1719 struct child_process ip = CHILD_PROCESS_INIT;
1720 const char *ip_argv[8];
1721
1722 close_pack_index(p);
1723
1724 fclose(preq->packfile);
1725 preq->packfile = NULL;
1726
1727 lst = preq->lst;
1728 while (*lst != p)
1729 lst = &((*lst)->next);
1730 *lst = (*lst)->next;
1731
1732 if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1733 die("BUG: pack tmpfile does not end in .pack.temp?");
1734 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1735
1736 ip_argv[0] = "index-pack";
1737 ip_argv[1] = "-o";
1738 ip_argv[2] = tmp_idx;
1739 ip_argv[3] = preq->tmpfile;
1740 ip_argv[4] = NULL;
1741
1742 ip.argv = ip_argv;
1743 ip.git_cmd = 1;
1744 ip.no_stdin = 1;
1745 ip.no_stdout = 1;
1746
1747 if (run_command(&ip)) {
1748 unlink(preq->tmpfile);
1749 unlink(tmp_idx);
1750 free(tmp_idx);
1751 return -1;
1752 }
1753
1754 unlink(sha1_pack_index_name(p->sha1));
1755
1756 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1757 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1758 free(tmp_idx);
1759 return -1;
1760 }
1761
1762 install_packed_git(p);
1763 free(tmp_idx);
1764 return 0;
1765 }
1766
1767 struct http_pack_request *new_http_pack_request(
1768 struct packed_git *target, const char *base_url)
1769 {
1770 off_t prev_posn = 0;
1771 struct strbuf buf = STRBUF_INIT;
1772 struct http_pack_request *preq;
1773
1774 preq = xcalloc(1, sizeof(*preq));
1775 preq->target = target;
1776
1777 end_url_with_slash(&buf, base_url);
1778 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1779 sha1_to_hex(target->sha1));
1780 preq->url = strbuf_detach(&buf, NULL);
1781
1782 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1783 sha1_pack_name(target->sha1));
1784 preq->packfile = fopen(preq->tmpfile, "a");
1785 if (!preq->packfile) {
1786 error("Unable to open local file %s for pack",
1787 preq->tmpfile);
1788 goto abort;
1789 }
1790
1791 preq->slot = get_active_slot();
1792 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1793 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1794 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1795 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1796 no_pragma_header);
1797
1798 /*
1799 * If there is data present from a previous transfer attempt,
1800 * resume where it left off
1801 */
1802 prev_posn = ftello(preq->packfile);
1803 if (prev_posn>0) {
1804 if (http_is_verbose)
1805 fprintf(stderr,
1806 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
1807 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
1808 http_opt_request_remainder(preq->slot->curl, prev_posn);
1809 }
1810
1811 return preq;
1812
1813 abort:
1814 free(preq->url);
1815 free(preq);
1816 return NULL;
1817 }
1818
1819 /* Helpers for fetching objects (loose) */
1820 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1821 void *data)
1822 {
1823 unsigned char expn[4096];
1824 size_t size = eltsize * nmemb;
1825 int posn = 0;
1826 struct http_object_request *freq =
1827 (struct http_object_request *)data;
1828 do {
1829 ssize_t retval = xwrite(freq->localfile,
1830 (char *) ptr + posn, size - posn);
1831 if (retval < 0)
1832 return posn;
1833 posn += retval;
1834 } while (posn < size);
1835
1836 freq->stream.avail_in = size;
1837 freq->stream.next_in = (void *)ptr;
1838 do {
1839 freq->stream.next_out = expn;
1840 freq->stream.avail_out = sizeof(expn);
1841 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1842 git_SHA1_Update(&freq->c, expn,
1843 sizeof(expn) - freq->stream.avail_out);
1844 } while (freq->stream.avail_in && freq->zret == Z_OK);
1845 return size;
1846 }
1847
1848 struct http_object_request *new_http_object_request(const char *base_url,
1849 unsigned char *sha1)
1850 {
1851 char *hex = sha1_to_hex(sha1);
1852 const char *filename;
1853 char prevfile[PATH_MAX];
1854 int prevlocal;
1855 char prev_buf[PREV_BUF_SIZE];
1856 ssize_t prev_read = 0;
1857 off_t prev_posn = 0;
1858 struct http_object_request *freq;
1859
1860 freq = xcalloc(1, sizeof(*freq));
1861 hashcpy(freq->sha1, sha1);
1862 freq->localfile = -1;
1863
1864 filename = sha1_file_name(sha1);
1865 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1866 "%s.temp", filename);
1867
1868 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1869 unlink_or_warn(prevfile);
1870 rename(freq->tmpfile, prevfile);
1871 unlink_or_warn(freq->tmpfile);
1872
1873 if (freq->localfile != -1)
1874 error("fd leakage in start: %d", freq->localfile);
1875 freq->localfile = open(freq->tmpfile,
1876 O_WRONLY | O_CREAT | O_EXCL, 0666);
1877 /*
1878 * This could have failed due to the "lazy directory creation";
1879 * try to mkdir the last path component.
1880 */
1881 if (freq->localfile < 0 && errno == ENOENT) {
1882 char *dir = strrchr(freq->tmpfile, '/');
1883 if (dir) {
1884 *dir = 0;
1885 mkdir(freq->tmpfile, 0777);
1886 *dir = '/';
1887 }
1888 freq->localfile = open(freq->tmpfile,
1889 O_WRONLY | O_CREAT | O_EXCL, 0666);
1890 }
1891
1892 if (freq->localfile < 0) {
1893 error_errno("Couldn't create temporary file %s", freq->tmpfile);
1894 goto abort;
1895 }
1896
1897 git_inflate_init(&freq->stream);
1898
1899 git_SHA1_Init(&freq->c);
1900
1901 freq->url = get_remote_object_url(base_url, hex, 0);
1902
1903 /*
1904 * If a previous temp file is present, process what was already
1905 * fetched.
1906 */
1907 prevlocal = open(prevfile, O_RDONLY);
1908 if (prevlocal != -1) {
1909 do {
1910 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1911 if (prev_read>0) {
1912 if (fwrite_sha1_file(prev_buf,
1913 1,
1914 prev_read,
1915 freq) == prev_read) {
1916 prev_posn += prev_read;
1917 } else {
1918 prev_read = -1;
1919 }
1920 }
1921 } while (prev_read > 0);
1922 close(prevlocal);
1923 }
1924 unlink_or_warn(prevfile);
1925
1926 /*
1927 * Reset inflate/SHA1 if there was an error reading the previous temp
1928 * file; also rewind to the beginning of the local file.
1929 */
1930 if (prev_read == -1) {
1931 memset(&freq->stream, 0, sizeof(freq->stream));
1932 git_inflate_init(&freq->stream);
1933 git_SHA1_Init(&freq->c);
1934 if (prev_posn>0) {
1935 prev_posn = 0;
1936 lseek(freq->localfile, 0, SEEK_SET);
1937 if (ftruncate(freq->localfile, 0) < 0) {
1938 error_errno("Couldn't truncate temporary file %s",
1939 freq->tmpfile);
1940 goto abort;
1941 }
1942 }
1943 }
1944
1945 freq->slot = get_active_slot();
1946
1947 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1948 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1949 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1950 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1951 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1952
1953 /*
1954 * If we have successfully processed data from a previous fetch
1955 * attempt, only fetch the data we don't already have.
1956 */
1957 if (prev_posn>0) {
1958 if (http_is_verbose)
1959 fprintf(stderr,
1960 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
1961 hex, (uintmax_t)prev_posn);
1962 http_opt_request_remainder(freq->slot->curl, prev_posn);
1963 }
1964
1965 return freq;
1966
1967 abort:
1968 free(freq->url);
1969 free(freq);
1970 return NULL;
1971 }
1972
1973 void process_http_object_request(struct http_object_request *freq)
1974 {
1975 if (freq->slot == NULL)
1976 return;
1977 freq->curl_result = freq->slot->curl_result;
1978 freq->http_code = freq->slot->http_code;
1979 freq->slot = NULL;
1980 }
1981
1982 int finish_http_object_request(struct http_object_request *freq)
1983 {
1984 struct stat st;
1985
1986 close(freq->localfile);
1987 freq->localfile = -1;
1988
1989 process_http_object_request(freq);
1990
1991 if (freq->http_code == 416) {
1992 warning("requested range invalid; we may already have all the data.");
1993 } else if (freq->curl_result != CURLE_OK) {
1994 if (stat(freq->tmpfile, &st) == 0)
1995 if (st.st_size == 0)
1996 unlink_or_warn(freq->tmpfile);
1997 return -1;
1998 }
1999
2000 git_inflate_end(&freq->stream);
2001 git_SHA1_Final(freq->real_sha1, &freq->c);
2002 if (freq->zret != Z_STREAM_END) {
2003 unlink_or_warn(freq->tmpfile);
2004 return -1;
2005 }
2006 if (hashcmp(freq->sha1, freq->real_sha1)) {
2007 unlink_or_warn(freq->tmpfile);
2008 return -1;
2009 }
2010 freq->rename =
2011 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2012
2013 return freq->rename;
2014 }
2015
2016 void abort_http_object_request(struct http_object_request *freq)
2017 {
2018 unlink_or_warn(freq->tmpfile);
2019
2020 release_http_object_request(freq);
2021 }
2022
2023 void release_http_object_request(struct http_object_request *freq)
2024 {
2025 if (freq->localfile != -1) {
2026 close(freq->localfile);
2027 freq->localfile = -1;
2028 }
2029 if (freq->url != NULL) {
2030 free(freq->url);
2031 freq->url = NULL;
2032 }
2033 if (freq->slot != NULL) {
2034 freq->slot->callback_func = NULL;
2035 freq->slot->callback_data = NULL;
2036 release_active_slot(freq->slot);
2037 freq->slot = NULL;
2038 }
2039 }
Eric Wong's git-svn branch