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Merge branch 'jk/lose-name-path'
[git.git] / http.c
blobf543b142781644900721cd16492faf276e020645
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 static const char *ssl_cainfo;
66 static long curl_low_speed_limit = -1;
67 static long curl_low_speed_time = -1;
68 static int curl_ftp_no_epsv;
69 static const char *curl_http_proxy;
70 static const char *http_proxy_authmethod;
71 static struct {
72 const char *name;
73 long curlauth_param;
74 } proxy_authmethods[] = {
75 { "basic", CURLAUTH_BASIC },
76 { "digest", CURLAUTH_DIGEST },
77 { "negotiate", CURLAUTH_GSSNEGOTIATE },
78 { "ntlm", CURLAUTH_NTLM },
79 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
80 { "anyauth", CURLAUTH_ANY },
81 #endif
82 /*
83 * CURLAUTH_DIGEST_IE has no corresponding command-line option in
84 * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
85 * here, too
86 */
87 };
88 static struct credential proxy_auth = CREDENTIAL_INIT;
89 static const char *curl_proxyuserpwd;
90 static const char *curl_cookie_file;
91 static int curl_save_cookies;
92 struct credential http_auth = CREDENTIAL_INIT;
93 static int http_proactive_auth;
94 static const char *user_agent;
95
96 #if LIBCURL_VERSION_NUM >= 0x071700
97 /* Use CURLOPT_KEYPASSWD as is */
98 #elif LIBCURL_VERSION_NUM >= 0x070903
99 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
100 #else
101 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
102 #endif
103
104 static struct credential cert_auth = CREDENTIAL_INIT;
105 static int ssl_cert_password_required;
106 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
107 static unsigned long http_auth_methods = CURLAUTH_ANY;
108 #endif
109
110 static struct curl_slist *pragma_header;
111 static struct curl_slist *no_pragma_header;
112
113 static struct active_request_slot *active_queue_head;
114
115 static char *cached_accept_language;
116
117 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
118 {
119 size_t size = eltsize * nmemb;
120 struct buffer *buffer = buffer_;
121
122 if (size > buffer->buf.len - buffer->posn)
123 size = buffer->buf.len - buffer->posn;
124 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
125 buffer->posn += size;
126
127 return size;
128 }
129
130 #ifndef NO_CURL_IOCTL
131 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
132 {
133 struct buffer *buffer = clientp;
134
135 switch (cmd) {
136 case CURLIOCMD_NOP:
137 return CURLIOE_OK;
138
139 case CURLIOCMD_RESTARTREAD:
140 buffer->posn = 0;
141 return CURLIOE_OK;
142
143 default:
144 return CURLIOE_UNKNOWNCMD;
145 }
146 }
147 #endif
148
149 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
150 {
151 size_t size = eltsize * nmemb;
152 struct strbuf *buffer = buffer_;
153
154 strbuf_add(buffer, ptr, size);
155 return size;
156 }
157
158 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
159 {
160 return eltsize * nmemb;
161 }
162
163 static void closedown_active_slot(struct active_request_slot *slot)
164 {
165 active_requests--;
166 slot->in_use = 0;
167 }
168
169 static void finish_active_slot(struct active_request_slot *slot)
170 {
171 closedown_active_slot(slot);
172 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
173
174 if (slot->finished != NULL)
175 (*slot->finished) = 1;
176
177 /* Store slot results so they can be read after the slot is reused */
178 if (slot->results != NULL) {
179 slot->results->curl_result = slot->curl_result;
180 slot->results->http_code = slot->http_code;
181 #if LIBCURL_VERSION_NUM >= 0x070a08
182 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
183 &slot->results->auth_avail);
184 #else
185 slot->results->auth_avail = 0;
186 #endif
187
188 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
189 &slot->results->http_connectcode);
190 }
191
192 /* Run callback if appropriate */
193 if (slot->callback_func != NULL)
194 slot->callback_func(slot->callback_data);
195 }
196
197 #ifdef USE_CURL_MULTI
198 static void process_curl_messages(void)
199 {
200 int num_messages;
201 struct active_request_slot *slot;
202 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
203
204 while (curl_message != NULL) {
205 if (curl_message->msg == CURLMSG_DONE) {
206 int curl_result = curl_message->data.result;
207 slot = active_queue_head;
208 while (slot != NULL &&
209 slot->curl != curl_message->easy_handle)
210 slot = slot->next;
211 if (slot != NULL) {
212 curl_multi_remove_handle(curlm, slot->curl);
213 slot->curl_result = curl_result;
214 finish_active_slot(slot);
215 } else {
216 fprintf(stderr, "Received DONE message for unknown request!\n");
217 }
218 } else {
219 fprintf(stderr, "Unknown CURL message received: %d\n",
220 (int)curl_message->msg);
221 }
222 curl_message = curl_multi_info_read(curlm, &num_messages);
223 }
224 }
225 #endif
226
227 static int http_options(const char *var, const char *value, void *cb)
228 {
229 if (!strcmp("http.sslverify", var)) {
230 curl_ssl_verify = git_config_bool(var, value);
231 return 0;
232 }
233 if (!strcmp("http.sslcipherlist", var))
234 return git_config_string(&ssl_cipherlist, var, value);
235 if (!strcmp("http.sslversion", var))
236 return git_config_string(&ssl_version, var, value);
237 if (!strcmp("http.sslcert", var))
238 return git_config_string(&ssl_cert, var, value);
239 #if LIBCURL_VERSION_NUM >= 0x070903
240 if (!strcmp("http.sslkey", var))
241 return git_config_string(&ssl_key, var, value);
242 #endif
243 #if LIBCURL_VERSION_NUM >= 0x070908
244 if (!strcmp("http.sslcapath", var))
245 return git_config_pathname(&ssl_capath, var, value);
246 #endif
247 if (!strcmp("http.sslcainfo", var))
248 return git_config_pathname(&ssl_cainfo, var, value);
249 if (!strcmp("http.sslcertpasswordprotected", var)) {
250 ssl_cert_password_required = git_config_bool(var, value);
251 return 0;
252 }
253 if (!strcmp("http.ssltry", var)) {
254 curl_ssl_try = git_config_bool(var, value);
255 return 0;
256 }
257 if (!strcmp("http.minsessions", var)) {
258 min_curl_sessions = git_config_int(var, value);
259 #ifndef USE_CURL_MULTI
260 if (min_curl_sessions > 1)
261 min_curl_sessions = 1;
262 #endif
263 return 0;
264 }
265 #ifdef USE_CURL_MULTI
266 if (!strcmp("http.maxrequests", var)) {
267 max_requests = git_config_int(var, value);
268 return 0;
269 }
270 #endif
271 if (!strcmp("http.lowspeedlimit", var)) {
272 curl_low_speed_limit = (long)git_config_int(var, value);
273 return 0;
274 }
275 if (!strcmp("http.lowspeedtime", var)) {
276 curl_low_speed_time = (long)git_config_int(var, value);
277 return 0;
278 }
279
280 if (!strcmp("http.noepsv", var)) {
281 curl_ftp_no_epsv = git_config_bool(var, value);
282 return 0;
283 }
284 if (!strcmp("http.proxy", var))
285 return git_config_string(&curl_http_proxy, var, value);
286
287 if (!strcmp("http.proxyauthmethod", var))
288 return git_config_string(&http_proxy_authmethod, var, value);
289
290 if (!strcmp("http.cookiefile", var))
291 return git_config_string(&curl_cookie_file, var, value);
292 if (!strcmp("http.savecookies", var)) {
293 curl_save_cookies = git_config_bool(var, value);
294 return 0;
295 }
296
297 if (!strcmp("http.postbuffer", var)) {
298 http_post_buffer = git_config_int(var, value);
299 if (http_post_buffer < LARGE_PACKET_MAX)
300 http_post_buffer = LARGE_PACKET_MAX;
301 return 0;
302 }
303
304 if (!strcmp("http.useragent", var))
305 return git_config_string(&user_agent, var, value);
306
307 /* Fall back on the default ones */
308 return git_default_config(var, value, cb);
309 }
310
311 static void init_curl_http_auth(CURL *result)
312 {
313 if (!http_auth.username)
314 return;
315
316 credential_fill(&http_auth);
317
318 #if LIBCURL_VERSION_NUM >= 0x071301
319 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
320 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
321 #else
322 {
323 static struct strbuf up = STRBUF_INIT;
324 /*
325 * Note that we assume we only ever have a single set of
326 * credentials in a given program run, so we do not have
327 * to worry about updating this buffer, only setting its
328 * initial value.
329 */
330 if (!up.len)
331 strbuf_addf(&up, "%s:%s",
332 http_auth.username, http_auth.password);
333 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
334 }
335 #endif
336 }
337
338 /* *var must be free-able */
339 static void var_override(const char **var, char *value)
340 {
341 if (value) {
342 free((void *)*var);
343 *var = xstrdup(value);
344 }
345 }
346
347 static void set_proxyauth_name_password(CURL *result)
348 {
349 #if LIBCURL_VERSION_NUM >= 0x071301
350 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
351 proxy_auth.username);
352 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
353 proxy_auth.password);
354 #else
355 struct strbuf s = STRBUF_INIT;
356
357 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
358 strbuf_addch(&s, ':');
359 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
360 curl_proxyuserpwd = strbuf_detach(&s, NULL);
361 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
362 #endif
363 }
364
365 static void init_curl_proxy_auth(CURL *result)
366 {
367 if (proxy_auth.username) {
368 if (!proxy_auth.password)
369 credential_fill(&proxy_auth);
370 set_proxyauth_name_password(result);
371 }
372
373 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
374
375 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
376 if (http_proxy_authmethod) {
377 int i;
378 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
379 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
380 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
381 proxy_authmethods[i].curlauth_param);
382 break;
383 }
384 }
385 if (i == ARRAY_SIZE(proxy_authmethods)) {
386 warning("unsupported proxy authentication method %s: using anyauth",
387 http_proxy_authmethod);
388 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
389 }
390 }
391 else
392 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
393 #endif
394 }
395
396 static int has_cert_password(void)
397 {
398 if (ssl_cert == NULL || ssl_cert_password_required != 1)
399 return 0;
400 if (!cert_auth.password) {
401 cert_auth.protocol = xstrdup("cert");
402 cert_auth.username = xstrdup("");
403 cert_auth.path = xstrdup(ssl_cert);
404 credential_fill(&cert_auth);
405 }
406 return 1;
407 }
408
409 #if LIBCURL_VERSION_NUM >= 0x071900
410 static void set_curl_keepalive(CURL *c)
411 {
412 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
413 }
414
415 #elif LIBCURL_VERSION_NUM >= 0x071000
416 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
417 {
418 int ka = 1;
419 int rc;
420 socklen_t len = (socklen_t)sizeof(ka);
421
422 if (type != CURLSOCKTYPE_IPCXN)
423 return 0;
424
425 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
426 if (rc < 0)
427 warning("unable to set SO_KEEPALIVE on socket %s",
428 strerror(errno));
429
430 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
431 }
432
433 static void set_curl_keepalive(CURL *c)
434 {
435 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
436 }
437
438 #else
439 static void set_curl_keepalive(CURL *c)
440 {
441 /* not supported on older curl versions */
442 }
443 #endif
444
445 static CURL *get_curl_handle(void)
446 {
447 CURL *result = curl_easy_init();
448 long allowed_protocols = 0;
449
450 if (!result)
451 die("curl_easy_init failed");
452
453 if (!curl_ssl_verify) {
454 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
455 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
456 } else {
457 /* Verify authenticity of the peer's certificate */
458 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
459 /* The name in the cert must match whom we tried to connect */
460 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
461 }
462
463 #if LIBCURL_VERSION_NUM >= 0x070907
464 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
465 #endif
466 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
467 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
468 #endif
469
470 if (http_proactive_auth)
471 init_curl_http_auth(result);
472
473 if (getenv("GIT_SSL_VERSION"))
474 ssl_version = getenv("GIT_SSL_VERSION");
475 if (ssl_version && *ssl_version) {
476 int i;
477 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
478 if (!strcmp(ssl_version, sslversions[i].name)) {
479 curl_easy_setopt(result, CURLOPT_SSLVERSION,
480 sslversions[i].ssl_version);
481 break;
482 }
483 }
484 if (i == ARRAY_SIZE(sslversions))
485 warning("unsupported ssl version %s: using default",
486 ssl_version);
487 }
488
489 if (getenv("GIT_SSL_CIPHER_LIST"))
490 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
491 if (ssl_cipherlist != NULL && *ssl_cipherlist)
492 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
493 ssl_cipherlist);
494
495 if (ssl_cert != NULL)
496 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
497 if (has_cert_password())
498 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
499 #if LIBCURL_VERSION_NUM >= 0x070903
500 if (ssl_key != NULL)
501 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
502 #endif
503 #if LIBCURL_VERSION_NUM >= 0x070908
504 if (ssl_capath != NULL)
505 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
506 #endif
507 if (ssl_cainfo != NULL)
508 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
509
510 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
511 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
512 curl_low_speed_limit);
513 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
514 curl_low_speed_time);
515 }
516
517 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
518 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
519 #if LIBCURL_VERSION_NUM >= 0x071301
520 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
521 #elif LIBCURL_VERSION_NUM >= 0x071101
522 curl_easy_setopt(result, CURLOPT_POST301, 1);
523 #endif
524 #if LIBCURL_VERSION_NUM >= 0x071304
525 if (is_transport_allowed("http"))
526 allowed_protocols |= CURLPROTO_HTTP;
527 if (is_transport_allowed("https"))
528 allowed_protocols |= CURLPROTO_HTTPS;
529 if (is_transport_allowed("ftp"))
530 allowed_protocols |= CURLPROTO_FTP;
531 if (is_transport_allowed("ftps"))
532 allowed_protocols |= CURLPROTO_FTPS;
533 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
534 #else
535 if (transport_restrict_protocols())
536 warning("protocol restrictions not applied to curl redirects because\n"
537 "your curl version is too old (>= 7.19.4)");
538 #endif
539
540 if (getenv("GIT_CURL_VERBOSE"))
541 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
542
543 curl_easy_setopt(result, CURLOPT_USERAGENT,
544 user_agent ? user_agent : git_user_agent());
545
546 if (curl_ftp_no_epsv)
547 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
548
549 #ifdef CURLOPT_USE_SSL
550 if (curl_ssl_try)
551 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
552 #endif
553
554 /*
555 * CURL also examines these variables as a fallback; but we need to query
556 * them here in order to decide whether to prompt for missing password (cf.
557 * init_curl_proxy_auth()).
558 *
559 * Unlike many other common environment variables, these are historically
560 * lowercase only. It appears that CURL did not know this and implemented
561 * only uppercase variants, which was later corrected to take both - with
562 * the exception of http_proxy, which is lowercase only also in CURL. As
563 * the lowercase versions are the historical quasi-standard, they take
564 * precedence here, as in CURL.
565 */
566 if (!curl_http_proxy) {
567 if (!strcmp(http_auth.protocol, "https")) {
568 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
569 var_override(&curl_http_proxy, getenv("https_proxy"));
570 } else {
571 var_override(&curl_http_proxy, getenv("http_proxy"));
572 }
573 if (!curl_http_proxy) {
574 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
575 var_override(&curl_http_proxy, getenv("all_proxy"));
576 }
577 }
578
579 if (curl_http_proxy) {
580 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
581 #if LIBCURL_VERSION_NUM >= 0x071800
582 if (starts_with(curl_http_proxy, "socks5"))
583 curl_easy_setopt(result,
584 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
585 else if (starts_with(curl_http_proxy, "socks4a"))
586 curl_easy_setopt(result,
587 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
588 else if (starts_with(curl_http_proxy, "socks"))
589 curl_easy_setopt(result,
590 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
591 #endif
592 if (strstr(curl_http_proxy, "://"))
593 credential_from_url(&proxy_auth, curl_http_proxy);
594 else {
595 struct strbuf url = STRBUF_INIT;
596 strbuf_addf(&url, "http://%s", curl_http_proxy);
597 credential_from_url(&proxy_auth, url.buf);
598 strbuf_release(&url);
599 }
600
601 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
602 }
603 init_curl_proxy_auth(result);
604
605 set_curl_keepalive(result);
606
607 return result;
608 }
609
610 static void set_from_env(const char **var, const char *envname)
611 {
612 const char *val = getenv(envname);
613 if (val)
614 *var = val;
615 }
616
617 void http_init(struct remote *remote, const char *url, int proactive_auth)
618 {
619 char *low_speed_limit;
620 char *low_speed_time;
621 char *normalized_url;
622 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
623
624 config.section = "http";
625 config.key = NULL;
626 config.collect_fn = http_options;
627 config.cascade_fn = git_default_config;
628 config.cb = NULL;
629
630 http_is_verbose = 0;
631 normalized_url = url_normalize(url, &config.url);
632
633 git_config(urlmatch_config_entry, &config);
634 free(normalized_url);
635
636 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
637 die("curl_global_init failed");
638
639 http_proactive_auth = proactive_auth;
640
641 if (remote && remote->http_proxy)
642 curl_http_proxy = xstrdup(remote->http_proxy);
643
644 if (remote)
645 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
646
647 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
648 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
649
650 #ifdef USE_CURL_MULTI
651 {
652 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
653 if (http_max_requests != NULL)
654 max_requests = atoi(http_max_requests);
655 }
656
657 curlm = curl_multi_init();
658 if (!curlm)
659 die("curl_multi_init failed");
660 #endif
661
662 if (getenv("GIT_SSL_NO_VERIFY"))
663 curl_ssl_verify = 0;
664
665 set_from_env(&ssl_cert, "GIT_SSL_CERT");
666 #if LIBCURL_VERSION_NUM >= 0x070903
667 set_from_env(&ssl_key, "GIT_SSL_KEY");
668 #endif
669 #if LIBCURL_VERSION_NUM >= 0x070908
670 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
671 #endif
672 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
673
674 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
675
676 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
677 if (low_speed_limit != NULL)
678 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
679 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
680 if (low_speed_time != NULL)
681 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
682
683 if (curl_ssl_verify == -1)
684 curl_ssl_verify = 1;
685
686 curl_session_count = 0;
687 #ifdef USE_CURL_MULTI
688 if (max_requests < 1)
689 max_requests = DEFAULT_MAX_REQUESTS;
690 #endif
691
692 if (getenv("GIT_CURL_FTP_NO_EPSV"))
693 curl_ftp_no_epsv = 1;
694
695 if (url) {
696 credential_from_url(&http_auth, url);
697 if (!ssl_cert_password_required &&
698 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
699 starts_with(url, "https://"))
700 ssl_cert_password_required = 1;
701 }
702
703 #ifndef NO_CURL_EASY_DUPHANDLE
704 curl_default = get_curl_handle();
705 #endif
706 }
707
708 void http_cleanup(void)
709 {
710 struct active_request_slot *slot = active_queue_head;
711
712 while (slot != NULL) {
713 struct active_request_slot *next = slot->next;
714 if (slot->curl != NULL) {
715 #ifdef USE_CURL_MULTI
716 curl_multi_remove_handle(curlm, slot->curl);
717 #endif
718 curl_easy_cleanup(slot->curl);
719 }
720 free(slot);
721 slot = next;
722 }
723 active_queue_head = NULL;
724
725 #ifndef NO_CURL_EASY_DUPHANDLE
726 curl_easy_cleanup(curl_default);
727 #endif
728
729 #ifdef USE_CURL_MULTI
730 curl_multi_cleanup(curlm);
731 #endif
732 curl_global_cleanup();
733
734 curl_slist_free_all(pragma_header);
735 pragma_header = NULL;
736
737 curl_slist_free_all(no_pragma_header);
738 no_pragma_header = NULL;
739
740 if (curl_http_proxy) {
741 free((void *)curl_http_proxy);
742 curl_http_proxy = NULL;
743 }
744
745 if (proxy_auth.password) {
746 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
747 free(proxy_auth.password);
748 proxy_auth.password = NULL;
749 }
750
751 free((void *)curl_proxyuserpwd);
752 curl_proxyuserpwd = NULL;
753
754 free((void *)http_proxy_authmethod);
755 http_proxy_authmethod = NULL;
756
757 if (cert_auth.password != NULL) {
758 memset(cert_auth.password, 0, strlen(cert_auth.password));
759 free(cert_auth.password);
760 cert_auth.password = NULL;
761 }
762 ssl_cert_password_required = 0;
763
764 free(cached_accept_language);
765 cached_accept_language = NULL;
766 }
767
768 struct active_request_slot *get_active_slot(void)
769 {
770 struct active_request_slot *slot = active_queue_head;
771 struct active_request_slot *newslot;
772
773 #ifdef USE_CURL_MULTI
774 int num_transfers;
775
776 /* Wait for a slot to open up if the queue is full */
777 while (active_requests >= max_requests) {
778 curl_multi_perform(curlm, &num_transfers);
779 if (num_transfers < active_requests)
780 process_curl_messages();
781 }
782 #endif
783
784 while (slot != NULL && slot->in_use)
785 slot = slot->next;
786
787 if (slot == NULL) {
788 newslot = xmalloc(sizeof(*newslot));
789 newslot->curl = NULL;
790 newslot->in_use = 0;
791 newslot->next = NULL;
792
793 slot = active_queue_head;
794 if (slot == NULL) {
795 active_queue_head = newslot;
796 } else {
797 while (slot->next != NULL)
798 slot = slot->next;
799 slot->next = newslot;
800 }
801 slot = newslot;
802 }
803
804 if (slot->curl == NULL) {
805 #ifdef NO_CURL_EASY_DUPHANDLE
806 slot->curl = get_curl_handle();
807 #else
808 slot->curl = curl_easy_duphandle(curl_default);
809 #endif
810 curl_session_count++;
811 }
812
813 active_requests++;
814 slot->in_use = 1;
815 slot->results = NULL;
816 slot->finished = NULL;
817 slot->callback_data = NULL;
818 slot->callback_func = NULL;
819 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
820 if (curl_save_cookies)
821 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
822 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
823 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
824 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
825 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
826 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
827 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
828 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
829 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
830 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
831 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
832
833 #if LIBCURL_VERSION_NUM >= 0x070a08
834 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
835 #endif
836 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
837 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
838 #endif
839 if (http_auth.password)
840 init_curl_http_auth(slot->curl);
841
842 return slot;
843 }
844
845 int start_active_slot(struct active_request_slot *slot)
846 {
847 #ifdef USE_CURL_MULTI
848 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
849 int num_transfers;
850
851 if (curlm_result != CURLM_OK &&
852 curlm_result != CURLM_CALL_MULTI_PERFORM) {
853 active_requests--;
854 slot->in_use = 0;
855 return 0;
856 }
857
858 /*
859 * We know there must be something to do, since we just added
860 * something.
861 */
862 curl_multi_perform(curlm, &num_transfers);
863 #endif
864 return 1;
865 }
866
867 #ifdef USE_CURL_MULTI
868 struct fill_chain {
869 void *data;
870 int (*fill)(void *);
871 struct fill_chain *next;
872 };
873
874 static struct fill_chain *fill_cfg;
875
876 void add_fill_function(void *data, int (*fill)(void *))
877 {
878 struct fill_chain *new = xmalloc(sizeof(*new));
879 struct fill_chain **linkp = &fill_cfg;
880 new->data = data;
881 new->fill = fill;
882 new->next = NULL;
883 while (*linkp)
884 linkp = &(*linkp)->next;
885 *linkp = new;
886 }
887
888 void fill_active_slots(void)
889 {
890 struct active_request_slot *slot = active_queue_head;
891
892 while (active_requests < max_requests) {
893 struct fill_chain *fill;
894 for (fill = fill_cfg; fill; fill = fill->next)
895 if (fill->fill(fill->data))
896 break;
897
898 if (!fill)
899 break;
900 }
901
902 while (slot != NULL) {
903 if (!slot->in_use && slot->curl != NULL
904 && curl_session_count > min_curl_sessions) {
905 curl_easy_cleanup(slot->curl);
906 slot->curl = NULL;
907 curl_session_count--;
908 }
909 slot = slot->next;
910 }
911 }
912
913 void step_active_slots(void)
914 {
915 int num_transfers;
916 CURLMcode curlm_result;
917
918 do {
919 curlm_result = curl_multi_perform(curlm, &num_transfers);
920 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
921 if (num_transfers < active_requests) {
922 process_curl_messages();
923 fill_active_slots();
924 }
925 }
926 #endif
927
928 void run_active_slot(struct active_request_slot *slot)
929 {
930 #ifdef USE_CURL_MULTI
931 fd_set readfds;
932 fd_set writefds;
933 fd_set excfds;
934 int max_fd;
935 struct timeval select_timeout;
936 int finished = 0;
937
938 slot->finished = &finished;
939 while (!finished) {
940 step_active_slots();
941
942 if (slot->in_use) {
943 #if LIBCURL_VERSION_NUM >= 0x070f04
944 long curl_timeout;
945 curl_multi_timeout(curlm, &curl_timeout);
946 if (curl_timeout == 0) {
947 continue;
948 } else if (curl_timeout == -1) {
949 select_timeout.tv_sec = 0;
950 select_timeout.tv_usec = 50000;
951 } else {
952 select_timeout.tv_sec = curl_timeout / 1000;
953 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
954 }
955 #else
956 select_timeout.tv_sec = 0;
957 select_timeout.tv_usec = 50000;
958 #endif
959
960 max_fd = -1;
961 FD_ZERO(&readfds);
962 FD_ZERO(&writefds);
963 FD_ZERO(&excfds);
964 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
965
966 /*
967 * It can happen that curl_multi_timeout returns a pathologically
968 * long timeout when curl_multi_fdset returns no file descriptors
969 * to read. See commit message for more details.
970 */
971 if (max_fd < 0 &&
972 (select_timeout.tv_sec > 0 ||
973 select_timeout.tv_usec > 50000)) {
974 select_timeout.tv_sec = 0;
975 select_timeout.tv_usec = 50000;
976 }
977
978 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
979 }
980 }
981 #else
982 while (slot->in_use) {
983 slot->curl_result = curl_easy_perform(slot->curl);
984 finish_active_slot(slot);
985 }
986 #endif
987 }
988
989 static void release_active_slot(struct active_request_slot *slot)
990 {
991 closedown_active_slot(slot);
992 if (slot->curl && curl_session_count > min_curl_sessions) {
993 #ifdef USE_CURL_MULTI
994 curl_multi_remove_handle(curlm, slot->curl);
995 #endif
996 curl_easy_cleanup(slot->curl);
997 slot->curl = NULL;
998 curl_session_count--;
999 }
1000 #ifdef USE_CURL_MULTI
1001 fill_active_slots();
1002 #endif
1003 }
1004
1005 void finish_all_active_slots(void)
1006 {
1007 struct active_request_slot *slot = active_queue_head;
1008
1009 while (slot != NULL)
1010 if (slot->in_use) {
1011 run_active_slot(slot);
1012 slot = active_queue_head;
1013 } else {
1014 slot = slot->next;
1015 }
1016 }
1017
1018 /* Helpers for modifying and creating URLs */
1019 static inline int needs_quote(int ch)
1020 {
1021 if (((ch >= 'A') && (ch <= 'Z'))
1022 || ((ch >= 'a') && (ch <= 'z'))
1023 || ((ch >= '0') && (ch <= '9'))
1024 || (ch == '/')
1025 || (ch == '-')
1026 || (ch == '.'))
1027 return 0;
1028 return 1;
1029 }
1030
1031 static char *quote_ref_url(const char *base, const char *ref)
1032 {
1033 struct strbuf buf = STRBUF_INIT;
1034 const char *cp;
1035 int ch;
1036
1037 end_url_with_slash(&buf, base);
1038
1039 for (cp = ref; (ch = *cp) != 0; cp++)
1040 if (needs_quote(ch))
1041 strbuf_addf(&buf, "%%%02x", ch);
1042 else
1043 strbuf_addch(&buf, *cp);
1044
1045 return strbuf_detach(&buf, NULL);
1046 }
1047
1048 void append_remote_object_url(struct strbuf *buf, const char *url,
1049 const char *hex,
1050 int only_two_digit_prefix)
1051 {
1052 end_url_with_slash(buf, url);
1053
1054 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1055 if (!only_two_digit_prefix)
1056 strbuf_addf(buf, "%s", hex+2);
1057 }
1058
1059 char *get_remote_object_url(const char *url, const char *hex,
1060 int only_two_digit_prefix)
1061 {
1062 struct strbuf buf = STRBUF_INIT;
1063 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1064 return strbuf_detach(&buf, NULL);
1065 }
1066
1067 static int handle_curl_result(struct slot_results *results)
1068 {
1069 /*
1070 * If we see a failing http code with CURLE_OK, we have turned off
1071 * FAILONERROR (to keep the server's custom error response), and should
1072 * translate the code into failure here.
1073 */
1074 if (results->curl_result == CURLE_OK &&
1075 results->http_code >= 400) {
1076 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1077 /*
1078 * Normally curl will already have put the "reason phrase"
1079 * from the server into curl_errorstr; unfortunately without
1080 * FAILONERROR it is lost, so we can give only the numeric
1081 * status code.
1082 */
1083 snprintf(curl_errorstr, sizeof(curl_errorstr),
1084 "The requested URL returned error: %ld",
1085 results->http_code);
1086 }
1087
1088 if (results->curl_result == CURLE_OK) {
1089 credential_approve(&http_auth);
1090 if (proxy_auth.password)
1091 credential_approve(&proxy_auth);
1092 return HTTP_OK;
1093 } else if (missing_target(results))
1094 return HTTP_MISSING_TARGET;
1095 else if (results->http_code == 401) {
1096 if (http_auth.username && http_auth.password) {
1097 credential_reject(&http_auth);
1098 return HTTP_NOAUTH;
1099 } else {
1100 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1101 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1102 #endif
1103 return HTTP_REAUTH;
1104 }
1105 } else {
1106 if (results->http_connectcode == 407)
1107 credential_reject(&proxy_auth);
1108 #if LIBCURL_VERSION_NUM >= 0x070c00
1109 if (!curl_errorstr[0])
1110 strlcpy(curl_errorstr,
1111 curl_easy_strerror(results->curl_result),
1112 sizeof(curl_errorstr));
1113 #endif
1114 return HTTP_ERROR;
1115 }
1116 }
1117
1118 int run_one_slot(struct active_request_slot *slot,
1119 struct slot_results *results)
1120 {
1121 slot->results = results;
1122 if (!start_active_slot(slot)) {
1123 snprintf(curl_errorstr, sizeof(curl_errorstr),
1124 "failed to start HTTP request");
1125 return HTTP_START_FAILED;
1126 }
1127
1128 run_active_slot(slot);
1129 return handle_curl_result(results);
1130 }
1131
1132 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1133 {
1134 char *ptr;
1135 CURLcode ret;
1136
1137 strbuf_reset(buf);
1138 ret = curl_easy_getinfo(curl, info, &ptr);
1139 if (!ret && ptr)
1140 strbuf_addstr(buf, ptr);
1141 return ret;
1142 }
1143
1144 /*
1145 * Check for and extract a content-type parameter. "raw"
1146 * should be positioned at the start of the potential
1147 * parameter, with any whitespace already removed.
1148 *
1149 * "name" is the name of the parameter. The value is appended
1150 * to "out".
1151 */
1152 static int extract_param(const char *raw, const char *name,
1153 struct strbuf *out)
1154 {
1155 size_t len = strlen(name);
1156
1157 if (strncasecmp(raw, name, len))
1158 return -1;
1159 raw += len;
1160
1161 if (*raw != '=')
1162 return -1;
1163 raw++;
1164
1165 while (*raw && !isspace(*raw) && *raw != ';')
1166 strbuf_addch(out, *raw++);
1167 return 0;
1168 }
1169
1170 /*
1171 * Extract a normalized version of the content type, with any
1172 * spaces suppressed, all letters lowercased, and no trailing ";"
1173 * or parameters.
1174 *
1175 * Note that we will silently remove even invalid whitespace. For
1176 * example, "text / plain" is specifically forbidden by RFC 2616,
1177 * but "text/plain" is the only reasonable output, and this keeps
1178 * our code simple.
1179 *
1180 * If the "charset" argument is not NULL, store the value of any
1181 * charset parameter there.
1182 *
1183 * Example:
1184 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1185 * "text / plain" -> "text/plain"
1186 */
1187 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1188 struct strbuf *charset)
1189 {
1190 const char *p;
1191
1192 strbuf_reset(type);
1193 strbuf_grow(type, raw->len);
1194 for (p = raw->buf; *p; p++) {
1195 if (isspace(*p))
1196 continue;
1197 if (*p == ';') {
1198 p++;
1199 break;
1200 }
1201 strbuf_addch(type, tolower(*p));
1202 }
1203
1204 if (!charset)
1205 return;
1206
1207 strbuf_reset(charset);
1208 while (*p) {
1209 while (isspace(*p) || *p == ';')
1210 p++;
1211 if (!extract_param(p, "charset", charset))
1212 return;
1213 while (*p && !isspace(*p))
1214 p++;
1215 }
1216
1217 if (!charset->len && starts_with(type->buf, "text/"))
1218 strbuf_addstr(charset, "ISO-8859-1");
1219 }
1220
1221 static void write_accept_language(struct strbuf *buf)
1222 {
1223 /*
1224 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1225 * that, q-value will be smaller than 0.001, the minimum q-value the
1226 * HTTP specification allows. See
1227 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1228 */
1229 const int MAX_DECIMAL_PLACES = 3;
1230 const int MAX_LANGUAGE_TAGS = 1000;
1231 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1232 char **language_tags = NULL;
1233 int num_langs = 0;
1234 const char *s = get_preferred_languages();
1235 int i;
1236 struct strbuf tag = STRBUF_INIT;
1237
1238 /* Don't add Accept-Language header if no language is preferred. */
1239 if (!s)
1240 return;
1241
1242 /*
1243 * Split the colon-separated string of preferred languages into
1244 * language_tags array.
1245 */
1246 do {
1247 /* collect language tag */
1248 for (; *s && (isalnum(*s) || *s == '_'); s++)
1249 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1250
1251 /* skip .codeset, @modifier and any other unnecessary parts */
1252 while (*s && *s != ':')
1253 s++;
1254
1255 if (tag.len) {
1256 num_langs++;
1257 REALLOC_ARRAY(language_tags, num_langs);
1258 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1259 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1260 break;
1261 }
1262 } while (*s++);
1263
1264 /* write Accept-Language header into buf */
1265 if (num_langs) {
1266 int last_buf_len = 0;
1267 int max_q;
1268 int decimal_places;
1269 char q_format[32];
1270
1271 /* add '*' */
1272 REALLOC_ARRAY(language_tags, num_langs + 1);
1273 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1274
1275 /* compute decimal_places */
1276 for (max_q = 1, decimal_places = 0;
1277 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1278 decimal_places++, max_q *= 10)
1279 ;
1280
1281 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1282
1283 strbuf_addstr(buf, "Accept-Language: ");
1284
1285 for (i = 0; i < num_langs; i++) {
1286 if (i > 0)
1287 strbuf_addstr(buf, ", ");
1288
1289 strbuf_addstr(buf, language_tags[i]);
1290
1291 if (i > 0)
1292 strbuf_addf(buf, q_format, max_q - i);
1293
1294 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1295 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1296 break;
1297 }
1298
1299 last_buf_len = buf->len;
1300 }
1301 }
1302
1303 /* free language tags -- last one is a static '*' */
1304 for (i = 0; i < num_langs - 1; i++)
1305 free(language_tags[i]);
1306 free(language_tags);
1307 }
1308
1309 /*
1310 * Get an Accept-Language header which indicates user's preferred languages.
1311 *
1312 * Examples:
1313 * LANGUAGE= -> ""
1314 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1315 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1316 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1317 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1318 * LANGUAGE= LANG=C -> ""
1319 */
1320 static const char *get_accept_language(void)
1321 {
1322 if (!cached_accept_language) {
1323 struct strbuf buf = STRBUF_INIT;
1324 write_accept_language(&buf);
1325 if (buf.len > 0)
1326 cached_accept_language = strbuf_detach(&buf, NULL);
1327 }
1328
1329 return cached_accept_language;
1330 }
1331
1332 static void http_opt_request_remainder(CURL *curl, off_t pos)
1333 {
1334 char buf[128];
1335 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1336 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1337 }
1338
1339 /* http_request() targets */
1340 #define HTTP_REQUEST_STRBUF 0
1341 #define HTTP_REQUEST_FILE 1
1342
1343 static int http_request(const char *url,
1344 void *result, int target,
1345 const struct http_get_options *options)
1346 {
1347 struct active_request_slot *slot;
1348 struct slot_results results;
1349 struct curl_slist *headers = NULL;
1350 struct strbuf buf = STRBUF_INIT;
1351 const char *accept_language;
1352 int ret;
1353
1354 slot = get_active_slot();
1355 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1356
1357 if (result == NULL) {
1358 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1359 } else {
1360 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1361 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1362
1363 if (target == HTTP_REQUEST_FILE) {
1364 off_t posn = ftello(result);
1365 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1366 fwrite);
1367 if (posn > 0)
1368 http_opt_request_remainder(slot->curl, posn);
1369 } else
1370 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1371 fwrite_buffer);
1372 }
1373
1374 accept_language = get_accept_language();
1375
1376 if (accept_language)
1377 headers = curl_slist_append(headers, accept_language);
1378
1379 strbuf_addstr(&buf, "Pragma:");
1380 if (options && options->no_cache)
1381 strbuf_addstr(&buf, " no-cache");
1382 if (options && options->keep_error)
1383 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1384
1385 headers = curl_slist_append(headers, buf.buf);
1386
1387 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1388 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1389 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1390
1391 ret = run_one_slot(slot, &results);
1392
1393 if (options && options->content_type) {
1394 struct strbuf raw = STRBUF_INIT;
1395 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1396 extract_content_type(&raw, options->content_type,
1397 options->charset);
1398 strbuf_release(&raw);
1399 }
1400
1401 if (options && options->effective_url)
1402 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1403 options->effective_url);
1404
1405 curl_slist_free_all(headers);
1406 strbuf_release(&buf);
1407
1408 return ret;
1409 }
1410
1411 /*
1412 * Update the "base" url to a more appropriate value, as deduced by
1413 * redirects seen when requesting a URL starting with "url".
1414 *
1415 * The "asked" parameter is a URL that we asked curl to access, and must begin
1416 * with "base".
1417 *
1418 * The "got" parameter is the URL that curl reported to us as where we ended
1419 * up.
1420 *
1421 * Returns 1 if we updated the base url, 0 otherwise.
1422 *
1423 * Our basic strategy is to compare "base" and "asked" to find the bits
1424 * specific to our request. We then strip those bits off of "got" to yield the
1425 * new base. So for example, if our base is "http://example.com/foo.git",
1426 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1427 * with "https://other.example.com/foo.git/info/refs". We would want the
1428 * new URL to become "https://other.example.com/foo.git".
1429 *
1430 * Note that this assumes a sane redirect scheme. It's entirely possible
1431 * in the example above to end up at a URL that does not even end in
1432 * "info/refs". In such a case we simply punt, as there is not much we can
1433 * do (and such a scheme is unlikely to represent a real git repository,
1434 * which means we are likely about to abort anyway).
1435 */
1436 static int update_url_from_redirect(struct strbuf *base,
1437 const char *asked,
1438 const struct strbuf *got)
1439 {
1440 const char *tail;
1441 size_t tail_len;
1442
1443 if (!strcmp(asked, got->buf))
1444 return 0;
1445
1446 if (!skip_prefix(asked, base->buf, &tail))
1447 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1448 asked, base->buf);
1449
1450 tail_len = strlen(tail);
1451
1452 if (got->len < tail_len ||
1453 strcmp(tail, got->buf + got->len - tail_len))
1454 return 0; /* insane redirect scheme */
1455
1456 strbuf_reset(base);
1457 strbuf_add(base, got->buf, got->len - tail_len);
1458 return 1;
1459 }
1460
1461 static int http_request_reauth(const char *url,
1462 void *result, int target,
1463 struct http_get_options *options)
1464 {
1465 int ret = http_request(url, result, target, options);
1466
1467 if (options && options->effective_url && options->base_url) {
1468 if (update_url_from_redirect(options->base_url,
1469 url, options->effective_url)) {
1470 credential_from_url(&http_auth, options->base_url->buf);
1471 url = options->effective_url->buf;
1472 }
1473 }
1474
1475 if (ret != HTTP_REAUTH)
1476 return ret;
1477
1478 /*
1479 * If we are using KEEP_ERROR, the previous request may have
1480 * put cruft into our output stream; we should clear it out before
1481 * making our next request. We only know how to do this for
1482 * the strbuf case, but that is enough to satisfy current callers.
1483 */
1484 if (options && options->keep_error) {
1485 switch (target) {
1486 case HTTP_REQUEST_STRBUF:
1487 strbuf_reset(result);
1488 break;
1489 default:
1490 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1491 }
1492 }
1493
1494 credential_fill(&http_auth);
1495
1496 return http_request(url, result, target, options);
1497 }
1498
1499 int http_get_strbuf(const char *url,
1500 struct strbuf *result,
1501 struct http_get_options *options)
1502 {
1503 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1504 }
1505
1506 /*
1507 * Downloads a URL and stores the result in the given file.
1508 *
1509 * If a previous interrupted download is detected (i.e. a previous temporary
1510 * file is still around) the download is resumed.
1511 */
1512 static int http_get_file(const char *url, const char *filename,
1513 struct http_get_options *options)
1514 {
1515 int ret;
1516 struct strbuf tmpfile = STRBUF_INIT;
1517 FILE *result;
1518
1519 strbuf_addf(&tmpfile, "%s.temp", filename);
1520 result = fopen(tmpfile.buf, "a");
1521 if (!result) {
1522 error("Unable to open local file %s", tmpfile.buf);
1523 ret = HTTP_ERROR;
1524 goto cleanup;
1525 }
1526
1527 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1528 fclose(result);
1529
1530 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1531 ret = HTTP_ERROR;
1532 cleanup:
1533 strbuf_release(&tmpfile);
1534 return ret;
1535 }
1536
1537 int http_fetch_ref(const char *base, struct ref *ref)
1538 {
1539 struct http_get_options options = {0};
1540 char *url;
1541 struct strbuf buffer = STRBUF_INIT;
1542 int ret = -1;
1543
1544 options.no_cache = 1;
1545
1546 url = quote_ref_url(base, ref->name);
1547 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1548 strbuf_rtrim(&buffer);
1549 if (buffer.len == 40)
1550 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1551 else if (starts_with(buffer.buf, "ref: ")) {
1552 ref->symref = xstrdup(buffer.buf + 5);
1553 ret = 0;
1554 }
1555 }
1556
1557 strbuf_release(&buffer);
1558 free(url);
1559 return ret;
1560 }
1561
1562 /* Helpers for fetching packs */
1563 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1564 {
1565 char *url, *tmp;
1566 struct strbuf buf = STRBUF_INIT;
1567
1568 if (http_is_verbose)
1569 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1570
1571 end_url_with_slash(&buf, base_url);
1572 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1573 url = strbuf_detach(&buf, NULL);
1574
1575 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1576 tmp = strbuf_detach(&buf, NULL);
1577
1578 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1579 error("Unable to get pack index %s", url);
1580 free(tmp);
1581 tmp = NULL;
1582 }
1583
1584 free(url);
1585 return tmp;
1586 }
1587
1588 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1589 unsigned char *sha1, const char *base_url)
1590 {
1591 struct packed_git *new_pack;
1592 char *tmp_idx = NULL;
1593 int ret;
1594
1595 if (has_pack_index(sha1)) {
1596 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1597 if (!new_pack)
1598 return -1; /* parse_pack_index() already issued error message */
1599 goto add_pack;
1600 }
1601
1602 tmp_idx = fetch_pack_index(sha1, base_url);
1603 if (!tmp_idx)
1604 return -1;
1605
1606 new_pack = parse_pack_index(sha1, tmp_idx);
1607 if (!new_pack) {
1608 unlink(tmp_idx);
1609 free(tmp_idx);
1610
1611 return -1; /* parse_pack_index() already issued error message */
1612 }
1613
1614 ret = verify_pack_index(new_pack);
1615 if (!ret) {
1616 close_pack_index(new_pack);
1617 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1618 }
1619 free(tmp_idx);
1620 if (ret)
1621 return -1;
1622
1623 add_pack:
1624 new_pack->next = *packs_head;
1625 *packs_head = new_pack;
1626 return 0;
1627 }
1628
1629 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1630 {
1631 struct http_get_options options = {0};
1632 int ret = 0, i = 0;
1633 char *url, *data;
1634 struct strbuf buf = STRBUF_INIT;
1635 unsigned char sha1[20];
1636
1637 end_url_with_slash(&buf, base_url);
1638 strbuf_addstr(&buf, "objects/info/packs");
1639 url = strbuf_detach(&buf, NULL);
1640
1641 options.no_cache = 1;
1642 ret = http_get_strbuf(url, &buf, &options);
1643 if (ret != HTTP_OK)
1644 goto cleanup;
1645
1646 data = buf.buf;
1647 while (i < buf.len) {
1648 switch (data[i]) {
1649 case 'P':
1650 i++;
1651 if (i + 52 <= buf.len &&
1652 starts_with(data + i, " pack-") &&
1653 starts_with(data + i + 46, ".pack\n")) {
1654 get_sha1_hex(data + i + 6, sha1);
1655 fetch_and_setup_pack_index(packs_head, sha1,
1656 base_url);
1657 i += 51;
1658 break;
1659 }
1660 default:
1661 while (i < buf.len && data[i] != '\n')
1662 i++;
1663 }
1664 i++;
1665 }
1666
1667 cleanup:
1668 free(url);
1669 return ret;
1670 }
1671
1672 void release_http_pack_request(struct http_pack_request *preq)
1673 {
1674 if (preq->packfile != NULL) {
1675 fclose(preq->packfile);
1676 preq->packfile = NULL;
1677 }
1678 preq->slot = NULL;
1679 free(preq->url);
1680 free(preq);
1681 }
1682
1683 int finish_http_pack_request(struct http_pack_request *preq)
1684 {
1685 struct packed_git **lst;
1686 struct packed_git *p = preq->target;
1687 char *tmp_idx;
1688 size_t len;
1689 struct child_process ip = CHILD_PROCESS_INIT;
1690 const char *ip_argv[8];
1691
1692 close_pack_index(p);
1693
1694 fclose(preq->packfile);
1695 preq->packfile = NULL;
1696
1697 lst = preq->lst;
1698 while (*lst != p)
1699 lst = &((*lst)->next);
1700 *lst = (*lst)->next;
1701
1702 if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1703 die("BUG: pack tmpfile does not end in .pack.temp?");
1704 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1705
1706 ip_argv[0] = "index-pack";
1707 ip_argv[1] = "-o";
1708 ip_argv[2] = tmp_idx;
1709 ip_argv[3] = preq->tmpfile;
1710 ip_argv[4] = NULL;
1711
1712 ip.argv = ip_argv;
1713 ip.git_cmd = 1;
1714 ip.no_stdin = 1;
1715 ip.no_stdout = 1;
1716
1717 if (run_command(&ip)) {
1718 unlink(preq->tmpfile);
1719 unlink(tmp_idx);
1720 free(tmp_idx);
1721 return -1;
1722 }
1723
1724 unlink(sha1_pack_index_name(p->sha1));
1725
1726 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1727 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1728 free(tmp_idx);
1729 return -1;
1730 }
1731
1732 install_packed_git(p);
1733 free(tmp_idx);
1734 return 0;
1735 }
1736
1737 struct http_pack_request *new_http_pack_request(
1738 struct packed_git *target, const char *base_url)
1739 {
1740 off_t prev_posn = 0;
1741 struct strbuf buf = STRBUF_INIT;
1742 struct http_pack_request *preq;
1743
1744 preq = xcalloc(1, sizeof(*preq));
1745 preq->target = target;
1746
1747 end_url_with_slash(&buf, base_url);
1748 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1749 sha1_to_hex(target->sha1));
1750 preq->url = strbuf_detach(&buf, NULL);
1751
1752 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1753 sha1_pack_name(target->sha1));
1754 preq->packfile = fopen(preq->tmpfile, "a");
1755 if (!preq->packfile) {
1756 error("Unable to open local file %s for pack",
1757 preq->tmpfile);
1758 goto abort;
1759 }
1760
1761 preq->slot = get_active_slot();
1762 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1763 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1764 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1765 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1766 no_pragma_header);
1767
1768 /*
1769 * If there is data present from a previous transfer attempt,
1770 * resume where it left off
1771 */
1772 prev_posn = ftello(preq->packfile);
1773 if (prev_posn>0) {
1774 if (http_is_verbose)
1775 fprintf(stderr,
1776 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
1777 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
1778 http_opt_request_remainder(preq->slot->curl, prev_posn);
1779 }
1780
1781 return preq;
1782
1783 abort:
1784 free(preq->url);
1785 free(preq);
1786 return NULL;
1787 }
1788
1789 /* Helpers for fetching objects (loose) */
1790 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1791 void *data)
1792 {
1793 unsigned char expn[4096];
1794 size_t size = eltsize * nmemb;
1795 int posn = 0;
1796 struct http_object_request *freq =
1797 (struct http_object_request *)data;
1798 do {
1799 ssize_t retval = xwrite(freq->localfile,
1800 (char *) ptr + posn, size - posn);
1801 if (retval < 0)
1802 return posn;
1803 posn += retval;
1804 } while (posn < size);
1805
1806 freq->stream.avail_in = size;
1807 freq->stream.next_in = (void *)ptr;
1808 do {
1809 freq->stream.next_out = expn;
1810 freq->stream.avail_out = sizeof(expn);
1811 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1812 git_SHA1_Update(&freq->c, expn,
1813 sizeof(expn) - freq->stream.avail_out);
1814 } while (freq->stream.avail_in && freq->zret == Z_OK);
1815 return size;
1816 }
1817
1818 struct http_object_request *new_http_object_request(const char *base_url,
1819 unsigned char *sha1)
1820 {
1821 char *hex = sha1_to_hex(sha1);
1822 const char *filename;
1823 char prevfile[PATH_MAX];
1824 int prevlocal;
1825 char prev_buf[PREV_BUF_SIZE];
1826 ssize_t prev_read = 0;
1827 off_t prev_posn = 0;
1828 struct http_object_request *freq;
1829
1830 freq = xcalloc(1, sizeof(*freq));
1831 hashcpy(freq->sha1, sha1);
1832 freq->localfile = -1;
1833
1834 filename = sha1_file_name(sha1);
1835 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1836 "%s.temp", filename);
1837
1838 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1839 unlink_or_warn(prevfile);
1840 rename(freq->tmpfile, prevfile);
1841 unlink_or_warn(freq->tmpfile);
1842
1843 if (freq->localfile != -1)
1844 error("fd leakage in start: %d", freq->localfile);
1845 freq->localfile = open(freq->tmpfile,
1846 O_WRONLY | O_CREAT | O_EXCL, 0666);
1847 /*
1848 * This could have failed due to the "lazy directory creation";
1849 * try to mkdir the last path component.
1850 */
1851 if (freq->localfile < 0 && errno == ENOENT) {
1852 char *dir = strrchr(freq->tmpfile, '/');
1853 if (dir) {
1854 *dir = 0;
1855 mkdir(freq->tmpfile, 0777);
1856 *dir = '/';
1857 }
1858 freq->localfile = open(freq->tmpfile,
1859 O_WRONLY | O_CREAT | O_EXCL, 0666);
1860 }
1861
1862 if (freq->localfile < 0) {
1863 error("Couldn't create temporary file %s: %s",
1864 freq->tmpfile, strerror(errno));
1865 goto abort;
1866 }
1867
1868 git_inflate_init(&freq->stream);
1869
1870 git_SHA1_Init(&freq->c);
1871
1872 freq->url = get_remote_object_url(base_url, hex, 0);
1873
1874 /*
1875 * If a previous temp file is present, process what was already
1876 * fetched.
1877 */
1878 prevlocal = open(prevfile, O_RDONLY);
1879 if (prevlocal != -1) {
1880 do {
1881 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1882 if (prev_read>0) {
1883 if (fwrite_sha1_file(prev_buf,
1884 1,
1885 prev_read,
1886 freq) == prev_read) {
1887 prev_posn += prev_read;
1888 } else {
1889 prev_read = -1;
1890 }
1891 }
1892 } while (prev_read > 0);
1893 close(prevlocal);
1894 }
1895 unlink_or_warn(prevfile);
1896
1897 /*
1898 * Reset inflate/SHA1 if there was an error reading the previous temp
1899 * file; also rewind to the beginning of the local file.
1900 */
1901 if (prev_read == -1) {
1902 memset(&freq->stream, 0, sizeof(freq->stream));
1903 git_inflate_init(&freq->stream);
1904 git_SHA1_Init(&freq->c);
1905 if (prev_posn>0) {
1906 prev_posn = 0;
1907 lseek(freq->localfile, 0, SEEK_SET);
1908 if (ftruncate(freq->localfile, 0) < 0) {
1909 error("Couldn't truncate temporary file %s: %s",
1910 freq->tmpfile, strerror(errno));
1911 goto abort;
1912 }
1913 }
1914 }
1915
1916 freq->slot = get_active_slot();
1917
1918 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1919 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1920 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1921 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1922 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1923
1924 /*
1925 * If we have successfully processed data from a previous fetch
1926 * attempt, only fetch the data we don't already have.
1927 */
1928 if (prev_posn>0) {
1929 if (http_is_verbose)
1930 fprintf(stderr,
1931 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
1932 hex, (uintmax_t)prev_posn);
1933 http_opt_request_remainder(freq->slot->curl, prev_posn);
1934 }
1935
1936 return freq;
1937
1938 abort:
1939 free(freq->url);
1940 free(freq);
1941 return NULL;
1942 }
1943
1944 void process_http_object_request(struct http_object_request *freq)
1945 {
1946 if (freq->slot == NULL)
1947 return;
1948 freq->curl_result = freq->slot->curl_result;
1949 freq->http_code = freq->slot->http_code;
1950 freq->slot = NULL;
1951 }
1952
1953 int finish_http_object_request(struct http_object_request *freq)
1954 {
1955 struct stat st;
1956
1957 close(freq->localfile);
1958 freq->localfile = -1;
1959
1960 process_http_object_request(freq);
1961
1962 if (freq->http_code == 416) {
1963 warning("requested range invalid; we may already have all the data.");
1964 } else if (freq->curl_result != CURLE_OK) {
1965 if (stat(freq->tmpfile, &st) == 0)
1966 if (st.st_size == 0)
1967 unlink_or_warn(freq->tmpfile);
1968 return -1;
1969 }
1970
1971 git_inflate_end(&freq->stream);
1972 git_SHA1_Final(freq->real_sha1, &freq->c);
1973 if (freq->zret != Z_STREAM_END) {
1974 unlink_or_warn(freq->tmpfile);
1975 return -1;
1976 }
1977 if (hashcmp(freq->sha1, freq->real_sha1)) {
1978 unlink_or_warn(freq->tmpfile);
1979 return -1;
1980 }
1981 freq->rename =
1982 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
1983
1984 return freq->rename;
1985 }
1986
1987 void abort_http_object_request(struct http_object_request *freq)
1988 {
1989 unlink_or_warn(freq->tmpfile);
1990
1991 release_http_object_request(freq);
1992 }
1993
1994 void release_http_object_request(struct http_object_request *freq)
1995 {
1996 if (freq->localfile != -1) {
1997 close(freq->localfile);
1998 freq->localfile = -1;
1999 }
2000 if (freq->url != NULL) {
2001 free(freq->url);
2002 freq->url = NULL;
2003 }
2004 if (freq->slot != NULL) {
2005 freq->slot->callback_func = NULL;
2006 freq->slot->callback_data = NULL;
2007 release_active_slot(freq->slot);
2008 freq->slot = NULL;
2009 }
2010 }
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