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#if LIBCURL_VERSION_NUM >= 0x070a08
15long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
16#else
17long int git_curl_ipresolve;
18#endif
19int active_requests;
20int http_is_verbose;
21size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
22#if LIBCURL_VERSION_NUM >= 0x070a06
24#define LIBCURL_CAN_HANDLE_AUTH_ANY
25#endif
26static int min_curl_sessions = 1;
28static int curl_session_count;
29#ifdef USE_CURL_MULTI
30static int max_requests = -1;
31static CURLM *curlm;
32#endif
33#ifndef NO_CURL_EASY_DUPHANDLE
34static CURL *curl_default;
35#endif
36#define PREV_BUF_SIZE 4096
38char curl_errorstr[CURL_ERROR_SIZE];
40static int curl_ssl_verify = -1;
42static int curl_ssl_try;
43static const char *ssl_cert;
44static const char *ssl_cipherlist;
45static const char *ssl_version;
46static 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
60static const char *ssl_key;
61#endif
62#if LIBCURL_VERSION_NUM >= 0x070908
63static const char *ssl_capath;
64#endif
65#if LIBCURL_VERSION_NUM >= 0x072c00
66static const char *ssl_pinnedkey;
67#endif
68static const char *ssl_cainfo;
69static long curl_low_speed_limit = -1;
70static long curl_low_speed_time = -1;
71static int curl_ftp_no_epsv;
72static const char *curl_http_proxy;
73static const char *curl_no_proxy;
74static const char *http_proxy_authmethod;
75static 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};
92static struct credential proxy_auth = CREDENTIAL_INIT;
93static const char *curl_proxyuserpwd;
94static const char *curl_cookie_file;
95static int curl_save_cookies;
96struct credential http_auth = CREDENTIAL_INIT;
97static int http_proactive_auth;
98static const char *user_agent;
99static int curl_empty_auth;
100#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
108static struct credential cert_auth = CREDENTIAL_INIT;
110static int ssl_cert_password_required;
111#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
112static unsigned long http_auth_methods = CURLAUTH_ANY;
113#endif
114static struct curl_slist *pragma_header;
116static struct curl_slist *no_pragma_header;
117static struct curl_slist *extra_http_headers;
118static struct active_request_slot *active_queue_head;
120static char *cached_accept_language;
122size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
124{
125 size_t size = eltsize * nmemb;
126 struct buffer *buffer = buffer_;
127 if (size > buffer->buf.len - buffer->posn)
129 size = buffer->buf.len - buffer->posn;
130 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
131 buffer->posn += size;
132 return size;
134}
135#ifndef NO_CURL_IOCTL
137curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
138{
139 struct buffer *buffer = clientp;
140 switch (cmd) {
142 case CURLIOCMD_NOP:
143 return CURLIOE_OK;
144 case CURLIOCMD_RESTARTREAD:
146 buffer->posn = 0;
147 return CURLIOE_OK;
148 default:
150 return CURLIOE_UNKNOWNCMD;
151 }
152}
153#endif
154size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
156{
157 size_t size = eltsize * nmemb;
158 struct strbuf *buffer = buffer_;
159 strbuf_add(buffer, ptr, size);
161 return size;
162}
163size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
165{
166 return eltsize * nmemb;
167}
168static void closedown_active_slot(struct active_request_slot *slot)
170{
171 active_requests--;
172 slot->in_use = 0;
173}
174static void finish_active_slot(struct active_request_slot *slot)
176{
177 closedown_active_slot(slot);
178 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
179 if (slot->finished != NULL)
181 (*slot->finished) = 1;
182 /* Store slot results so they can be read after the slot is reused */
184 if (slot->results != NULL) {
185 slot->results->curl_result = slot->curl_result;
186 slot->results->http_code = slot->http_code;
187#if LIBCURL_VERSION_NUM >= 0x070a08
188 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
189 &slot->results->auth_avail);
190#else
191 slot->results->auth_avail = 0;
192#endif
193 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
195 &slot->results->http_connectcode);
196 }
197 /* Run callback if appropriate */
199 if (slot->callback_func != NULL)
200 slot->callback_func(slot->callback_data);
201}
202#ifdef USE_CURL_MULTI
204static void process_curl_messages(void)
205{
206 int num_messages;
207 struct active_request_slot *slot;
208 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
209 while (curl_message != NULL) {
211 if (curl_message->msg == CURLMSG_DONE) {
212 int curl_result = curl_message->data.result;
213 slot = active_queue_head;
214 while (slot != NULL &&
215 slot->curl != curl_message->easy_handle)
216 slot = slot->next;
217 if (slot != NULL) {
218 curl_multi_remove_handle(curlm, slot->curl);
219 slot->curl_result = curl_result;
220 finish_active_slot(slot);
221 } else {
222 fprintf(stderr, "Received DONE message for unknown request!\n");
223 }
224 } else {
225 fprintf(stderr, "Unknown CURL message received: %d\n",
226 (int)curl_message->msg);
227 }
228 curl_message = curl_multi_info_read(curlm, &num_messages);
229 }
230}
231#endif
232static int http_options(const char *var, const char *value, void *cb)
234{
235 if (!strcmp("http.sslverify", var)) {
236 curl_ssl_verify = git_config_bool(var, value);
237 return 0;
238 }
239 if (!strcmp("http.sslcipherlist", var))
240 return git_config_string(&ssl_cipherlist, var, value);
241 if (!strcmp("http.sslversion", var))
242 return git_config_string(&ssl_version, var, value);
243 if (!strcmp("http.sslcert", var))
244 return git_config_string(&ssl_cert, var, value);
245#if LIBCURL_VERSION_NUM >= 0x070903
246 if (!strcmp("http.sslkey", var))
247 return git_config_string(&ssl_key, var, value);
248#endif
249#if LIBCURL_VERSION_NUM >= 0x070908
250 if (!strcmp("http.sslcapath", var))
251 return git_config_pathname(&ssl_capath, var, value);
252#endif
253 if (!strcmp("http.sslcainfo", var))
254 return git_config_pathname(&ssl_cainfo, var, value);
255 if (!strcmp("http.sslcertpasswordprotected", var)) {
256 ssl_cert_password_required = git_config_bool(var, value);
257 return 0;
258 }
259 if (!strcmp("http.ssltry", var)) {
260 curl_ssl_try = git_config_bool(var, value);
261 return 0;
262 }
263 if (!strcmp("http.minsessions", var)) {
264 min_curl_sessions = git_config_int(var, value);
265#ifndef USE_CURL_MULTI
266 if (min_curl_sessions > 1)
267 min_curl_sessions = 1;
268#endif
269 return 0;
270 }
271#ifdef USE_CURL_MULTI
272 if (!strcmp("http.maxrequests", var)) {
273 max_requests = git_config_int(var, value);
274 return 0;
275 }
276#endif
277 if (!strcmp("http.lowspeedlimit", var)) {
278 curl_low_speed_limit = (long)git_config_int(var, value);
279 return 0;
280 }
281 if (!strcmp("http.lowspeedtime", var)) {
282 curl_low_speed_time = (long)git_config_int(var, value);
283 return 0;
284 }
285 if (!strcmp("http.noepsv", var)) {
287 curl_ftp_no_epsv = git_config_bool(var, value);
288 return 0;
289 }
290 if (!strcmp("http.proxy", var))
291 return git_config_string(&curl_http_proxy, var, value);
292 if (!strcmp("http.proxyauthmethod", var))
294 return git_config_string(&http_proxy_authmethod, var, value);
295 if (!strcmp("http.cookiefile", var))
297 return git_config_string(&curl_cookie_file, var, value);
298 if (!strcmp("http.savecookies", var)) {
299 curl_save_cookies = git_config_bool(var, value);
300 return 0;
301 }
302 if (!strcmp("http.postbuffer", var)) {
304 http_post_buffer = git_config_int(var, value);
305 if (http_post_buffer < LARGE_PACKET_MAX)
306 http_post_buffer = LARGE_PACKET_MAX;
307 return 0;
308 }
309 if (!strcmp("http.useragent", var))
311 return git_config_string(&user_agent, var, value);
312 if (!strcmp("http.emptyauth", var)) {
314 curl_empty_auth = git_config_bool(var, value);
315 return 0;
316 }
317 if (!strcmp("http.pinnedpubkey", var)) {
319#if LIBCURL_VERSION_NUM >= 0x072c00
320 return git_config_pathname(&ssl_pinnedkey, var, value);
321#else
322 warning(_("Public key pinning not supported with cURL < 7.44.0"));
323 return 0;
324#endif
325 }
326 if (!strcmp("http.extraheader", var)) {
328 if (!value) {
329 return config_error_nonbool(var);
330 } else if (!*value) {
331 curl_slist_free_all(extra_http_headers);
332 extra_http_headers = NULL;
333 } else {
334 extra_http_headers =
335 curl_slist_append(extra_http_headers, value);
336 }
337 return 0;
338 }
339 /* Fall back on the default ones */
341 return git_default_config(var, value, cb);
342}
343static void init_curl_http_auth(CURL *result)
345{
346 if (!http_auth.username) {
347 if (curl_empty_auth)
348 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
349 return;
350 }
351 credential_fill(&http_auth);
353#if LIBCURL_VERSION_NUM >= 0x071301
355 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
356 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
357#else
358 {
359 static struct strbuf up = STRBUF_INIT;
360 /*
361 * Note that we assume we only ever have a single set of
362 * credentials in a given program run, so we do not have
363 * to worry about updating this buffer, only setting its
364 * initial value.
365 */
366 if (!up.len)
367 strbuf_addf(&up, "%s:%s",
368 http_auth.username, http_auth.password);
369 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
370 }
371#endif
372}
373/* *var must be free-able */
375static void var_override(const char **var, char *value)
376{
377 if (value) {
378 free((void *)*var);
379 *var = xstrdup(value);
380 }
381}
382static void set_proxyauth_name_password(CURL *result)
384{
385#if LIBCURL_VERSION_NUM >= 0x071301
386 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
387 proxy_auth.username);
388 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
389 proxy_auth.password);
390#else
391 struct strbuf s = STRBUF_INIT;
392 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
394 strbuf_addch(&s, ':');
395 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
396 curl_proxyuserpwd = strbuf_detach(&s, NULL);
397 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
398#endif
399}
400static void init_curl_proxy_auth(CURL *result)
402{
403 if (proxy_auth.username) {
404 if (!proxy_auth.password)
405 credential_fill(&proxy_auth);
406 set_proxyauth_name_password(result);
407 }
408 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
410#if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
412 if (http_proxy_authmethod) {
413 int i;
414 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
415 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
416 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
417 proxy_authmethods[i].curlauth_param);
418 break;
419 }
420 }
421 if (i == ARRAY_SIZE(proxy_authmethods)) {
422 warning("unsupported proxy authentication method %s: using anyauth",
423 http_proxy_authmethod);
424 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
425 }
426 }
427 else
428 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
429#endif
430}
431static int has_cert_password(void)
433{
434 if (ssl_cert == NULL || ssl_cert_password_required != 1)
435 return 0;
436 if (!cert_auth.password) {
437 cert_auth.protocol = xstrdup("cert");
438 cert_auth.username = xstrdup("");
439 cert_auth.path = xstrdup(ssl_cert);
440 credential_fill(&cert_auth);
441 }
442 return 1;
443}
444#if LIBCURL_VERSION_NUM >= 0x071900
446static void set_curl_keepalive(CURL *c)
447{
448 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
449}
450#elif LIBCURL_VERSION_NUM >= 0x071000
452static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
453{
454 int ka = 1;
455 int rc;
456 socklen_t len = (socklen_t)sizeof(ka);
457 if (type != CURLSOCKTYPE_IPCXN)
459 return 0;
460 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
462 if (rc < 0)
463 warning("unable to set SO_KEEPALIVE on socket %s",
464 strerror(errno));
465 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
467}
468static void set_curl_keepalive(CURL *c)
470{
471 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
472}
473#else
475static void set_curl_keepalive(CURL *c)
476{
477 /* not supported on older curl versions */
478}
479#endif
480static CURL *get_curl_handle(void)
482{
483 CURL *result = curl_easy_init();
484 long allowed_protocols = 0;
485 if (!result)
487 die("curl_easy_init failed");
488 if (!curl_ssl_verify) {
490 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
491 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
492 } else {
493 /* Verify authenticity of the peer's certificate */
494 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
495 /* The name in the cert must match whom we tried to connect */
496 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
497 }
498#if LIBCURL_VERSION_NUM >= 0x070907
500 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
501#endif
502#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
503 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
504#endif
505 if (http_proactive_auth)
507 init_curl_http_auth(result);
508 if (getenv("GIT_SSL_VERSION"))
510 ssl_version = getenv("GIT_SSL_VERSION");
511 if (ssl_version && *ssl_version) {
512 int i;
513 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
514 if (!strcmp(ssl_version, sslversions[i].name)) {
515 curl_easy_setopt(result, CURLOPT_SSLVERSION,
516 sslversions[i].ssl_version);
517 break;
518 }
519 }
520 if (i == ARRAY_SIZE(sslversions))
521 warning("unsupported ssl version %s: using default",
522 ssl_version);
523 }
524 if (getenv("GIT_SSL_CIPHER_LIST"))
526 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
527 if (ssl_cipherlist != NULL && *ssl_cipherlist)
528 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
529 ssl_cipherlist);
530 if (ssl_cert != NULL)
532 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
533 if (has_cert_password())
534 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
535#if LIBCURL_VERSION_NUM >= 0x070903
536 if (ssl_key != NULL)
537 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
538#endif
539#if LIBCURL_VERSION_NUM >= 0x070908
540 if (ssl_capath != NULL)
541 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
542#endif
543#if LIBCURL_VERSION_NUM >= 0x072c00
544 if (ssl_pinnedkey != NULL)
545 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
546#endif
547 if (ssl_cainfo != NULL)
548 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
549 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
551 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
552 curl_low_speed_limit);
553 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
554 curl_low_speed_time);
555 }
556 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
558 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
559#if LIBCURL_VERSION_NUM >= 0x071301
560 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
561#elif LIBCURL_VERSION_NUM >= 0x071101
562 curl_easy_setopt(result, CURLOPT_POST301, 1);
563#endif
564#if LIBCURL_VERSION_NUM >= 0x071304
565 if (is_transport_allowed("http"))
566 allowed_protocols |= CURLPROTO_HTTP;
567 if (is_transport_allowed("https"))
568 allowed_protocols |= CURLPROTO_HTTPS;
569 if (is_transport_allowed("ftp"))
570 allowed_protocols |= CURLPROTO_FTP;
571 if (is_transport_allowed("ftps"))
572 allowed_protocols |= CURLPROTO_FTPS;
573 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
574#else
575 if (transport_restrict_protocols())
576 warning("protocol restrictions not applied to curl redirects because\n"
577 "your curl version is too old (>= 7.19.4)");
578#endif
579 if (getenv("GIT_CURL_VERBOSE"))
581 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
582 curl_easy_setopt(result, CURLOPT_USERAGENT,
584 user_agent ? user_agent : git_user_agent());
585 if (curl_ftp_no_epsv)
587 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
588#ifdef CURLOPT_USE_SSL
590 if (curl_ssl_try)
591 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
592#endif
593 /*
595 * CURL also examines these variables as a fallback; but we need to query
596 * them here in order to decide whether to prompt for missing password (cf.
597 * init_curl_proxy_auth()).
598 *
599 * Unlike many other common environment variables, these are historically
600 * lowercase only. It appears that CURL did not know this and implemented
601 * only uppercase variants, which was later corrected to take both - with
602 * the exception of http_proxy, which is lowercase only also in CURL. As
603 * the lowercase versions are the historical quasi-standard, they take
604 * precedence here, as in CURL.
605 */
606 if (!curl_http_proxy) {
607 if (!strcmp(http_auth.protocol, "https")) {
608 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
609 var_override(&curl_http_proxy, getenv("https_proxy"));
610 } else {
611 var_override(&curl_http_proxy, getenv("http_proxy"));
612 }
613 if (!curl_http_proxy) {
614 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
615 var_override(&curl_http_proxy, getenv("all_proxy"));
616 }
617 }
618 if (curl_http_proxy) {
620 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
621#if LIBCURL_VERSION_NUM >= 0x071800
622 if (starts_with(curl_http_proxy, "socks5h"))
623 curl_easy_setopt(result,
624 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
625 else if (starts_with(curl_http_proxy, "socks5"))
626 curl_easy_setopt(result,
627 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
628 else if (starts_with(curl_http_proxy, "socks4a"))
629 curl_easy_setopt(result,
630 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
631 else if (starts_with(curl_http_proxy, "socks"))
632 curl_easy_setopt(result,
633 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
634#endif
635 if (strstr(curl_http_proxy, "://"))
636 credential_from_url(&proxy_auth, curl_http_proxy);
637 else {
638 struct strbuf url = STRBUF_INIT;
639 strbuf_addf(&url, "http://%s", curl_http_proxy);
640 credential_from_url(&proxy_auth, url.buf);
641 strbuf_release(&url);
642 }
643 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
645#if LIBCURL_VERSION_NUM >= 0x071304
646 var_override(&curl_no_proxy, getenv("NO_PROXY"));
647 var_override(&curl_no_proxy, getenv("no_proxy"));
648 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
649#endif
650 }
651 init_curl_proxy_auth(result);
652 set_curl_keepalive(result);
654 return result;
656}
657static void set_from_env(const char **var, const char *envname)
659{
660 const char *val = getenv(envname);
661 if (val)
662 *var = val;
663}
664void http_init(struct remote *remote, const char *url, int proactive_auth)
666{
667 char *low_speed_limit;
668 char *low_speed_time;
669 char *normalized_url;
670 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
671 config.section = "http";
673 config.key = NULL;
674 config.collect_fn = http_options;
675 config.cascade_fn = git_default_config;
676 config.cb = NULL;
677 http_is_verbose = 0;
679 normalized_url = url_normalize(url, &config.url);
680 git_config(urlmatch_config_entry, &config);
682 free(normalized_url);
683 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
685 die("curl_global_init failed");
686 http_proactive_auth = proactive_auth;
688 if (remote && remote->http_proxy)
690 curl_http_proxy = xstrdup(remote->http_proxy);
691 if (remote)
693 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
694 pragma_header = curl_slist_append(http_copy_default_headers(),
696 "Pragma: no-cache");
697 no_pragma_header = curl_slist_append(http_copy_default_headers(),
698 "Pragma:");
699#ifdef USE_CURL_MULTI
701 {
702 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
703 if (http_max_requests != NULL)
704 max_requests = atoi(http_max_requests);
705 }
706 curlm = curl_multi_init();
708 if (!curlm)
709 die("curl_multi_init failed");
710#endif
711 if (getenv("GIT_SSL_NO_VERIFY"))
713 curl_ssl_verify = 0;
714 set_from_env(&ssl_cert, "GIT_SSL_CERT");
716#if LIBCURL_VERSION_NUM >= 0x070903
717 set_from_env(&ssl_key, "GIT_SSL_KEY");
718#endif
719#if LIBCURL_VERSION_NUM >= 0x070908
720 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
721#endif
722 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
723 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
725 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
727 if (low_speed_limit != NULL)
728 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
729 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
730 if (low_speed_time != NULL)
731 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
732 if (curl_ssl_verify == -1)
734 curl_ssl_verify = 1;
735 curl_session_count = 0;
737#ifdef USE_CURL_MULTI
738 if (max_requests < 1)
739 max_requests = DEFAULT_MAX_REQUESTS;
740#endif
741 if (getenv("GIT_CURL_FTP_NO_EPSV"))
743 curl_ftp_no_epsv = 1;
744 if (url) {
746 credential_from_url(&http_auth, url);
747 if (!ssl_cert_password_required &&
748 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
749 starts_with(url, "https://"))
750 ssl_cert_password_required = 1;
751 }
752#ifndef NO_CURL_EASY_DUPHANDLE
754 curl_default = get_curl_handle();
755#endif
756}
757void http_cleanup(void)
759{
760 struct active_request_slot *slot = active_queue_head;
761 while (slot != NULL) {
763 struct active_request_slot *next = slot->next;
764 if (slot->curl != NULL) {
765#ifdef USE_CURL_MULTI
766 curl_multi_remove_handle(curlm, slot->curl);
767#endif
768 curl_easy_cleanup(slot->curl);
769 }
770 free(slot);
771 slot = next;
772 }
773 active_queue_head = NULL;
774#ifndef NO_CURL_EASY_DUPHANDLE
776 curl_easy_cleanup(curl_default);
777#endif
778#ifdef USE_CURL_MULTI
780 curl_multi_cleanup(curlm);
781#endif
782 curl_global_cleanup();
783 curl_slist_free_all(extra_http_headers);
785 extra_http_headers = NULL;
786 curl_slist_free_all(pragma_header);
788 pragma_header = NULL;
789 curl_slist_free_all(no_pragma_header);
791 no_pragma_header = NULL;
792 if (curl_http_proxy) {
794 free((void *)curl_http_proxy);
795 curl_http_proxy = NULL;
796 }
797 if (proxy_auth.password) {
799 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
800 free(proxy_auth.password);
801 proxy_auth.password = NULL;
802 }
803 free((void *)curl_proxyuserpwd);
805 curl_proxyuserpwd = NULL;
806 free((void *)http_proxy_authmethod);
808 http_proxy_authmethod = NULL;
809 if (cert_auth.password != NULL) {
811 memset(cert_auth.password, 0, strlen(cert_auth.password));
812 free(cert_auth.password);
813 cert_auth.password = NULL;
814 }
815 ssl_cert_password_required = 0;
816 free(cached_accept_language);
818 cached_accept_language = NULL;
819}
820struct active_request_slot *get_active_slot(void)
822{
823 struct active_request_slot *slot = active_queue_head;
824 struct active_request_slot *newslot;
825#ifdef USE_CURL_MULTI
827 int num_transfers;
828 /* Wait for a slot to open up if the queue is full */
830 while (active_requests >= max_requests) {
831 curl_multi_perform(curlm, &num_transfers);
832 if (num_transfers < active_requests)
833 process_curl_messages();
834 }
835#endif
836 while (slot != NULL && slot->in_use)
838 slot = slot->next;
839 if (slot == NULL) {
841 newslot = xmalloc(sizeof(*newslot));
842 newslot->curl = NULL;
843 newslot->in_use = 0;
844 newslot->next = NULL;
845 slot = active_queue_head;
847 if (slot == NULL) {
848 active_queue_head = newslot;
849 } else {
850 while (slot->next != NULL)
851 slot = slot->next;
852 slot->next = newslot;
853 }
854 slot = newslot;
855 }
856 if (slot->curl == NULL) {
858#ifdef NO_CURL_EASY_DUPHANDLE
859 slot->curl = get_curl_handle();
860#else
861 slot->curl = curl_easy_duphandle(curl_default);
862#endif
863 curl_session_count++;
864 }
865 active_requests++;
867 slot->in_use = 1;
868 slot->results = NULL;
869 slot->finished = NULL;
870 slot->callback_data = NULL;
871 slot->callback_func = NULL;
872 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
873 if (curl_save_cookies)
874 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
875 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
876 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
877 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
878 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
879 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
880 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
881 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
882 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
883 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
884 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
885#if LIBCURL_VERSION_NUM >= 0x070a08
887 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
888#endif
889#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
890 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
891#endif
892 if (http_auth.password || curl_empty_auth)
893 init_curl_http_auth(slot->curl);
894 return slot;
896}
897int start_active_slot(struct active_request_slot *slot)
899{
900#ifdef USE_CURL_MULTI
901 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
902 int num_transfers;
903 if (curlm_result != CURLM_OK &&
905 curlm_result != CURLM_CALL_MULTI_PERFORM) {
906 active_requests--;
907 slot->in_use = 0;
908 return 0;
909 }
910 /*
912 * We know there must be something to do, since we just added
913 * something.
914 */
915 curl_multi_perform(curlm, &num_transfers);
916#endif
917 return 1;
918}
919#ifdef USE_CURL_MULTI
921struct fill_chain {
922 void *data;
923 int (*fill)(void *);
924 struct fill_chain *next;
925};
926static struct fill_chain *fill_cfg;
928void add_fill_function(void *data, int (*fill)(void *))
930{
931 struct fill_chain *new = xmalloc(sizeof(*new));
932 struct fill_chain **linkp = &fill_cfg;
933 new->data = data;
934 new->fill = fill;
935 new->next = NULL;
936 while (*linkp)
937 linkp = &(*linkp)->next;
938 *linkp = new;
939}
940void fill_active_slots(void)
942{
943 struct active_request_slot *slot = active_queue_head;
944 while (active_requests < max_requests) {
946 struct fill_chain *fill;
947 for (fill = fill_cfg; fill; fill = fill->next)
948 if (fill->fill(fill->data))
949 break;
950 if (!fill)
952 break;
953 }
954 while (slot != NULL) {
956 if (!slot->in_use && slot->curl != NULL
957 && curl_session_count > min_curl_sessions) {
958 curl_easy_cleanup(slot->curl);
959 slot->curl = NULL;
960 curl_session_count--;
961 }
962 slot = slot->next;
963 }
964}
965void step_active_slots(void)
967{
968 int num_transfers;
969 CURLMcode curlm_result;
970 do {
972 curlm_result = curl_multi_perform(curlm, &num_transfers);
973 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
974 if (num_transfers < active_requests) {
975 process_curl_messages();
976 fill_active_slots();
977 }
978}
979#endif
980void run_active_slot(struct active_request_slot *slot)
982{
983#ifdef USE_CURL_MULTI
984 fd_set readfds;
985 fd_set writefds;
986 fd_set excfds;
987 int max_fd;
988 struct timeval select_timeout;
989 int finished = 0;
990 slot->finished = &finished;
992 while (!finished) {
993 step_active_slots();
994 if (slot->in_use) {
996#if LIBCURL_VERSION_NUM >= 0x070f04
997 long curl_timeout;
998 curl_multi_timeout(curlm, &curl_timeout);
999 if (curl_timeout == 0) {
1000 continue;
1001 } else if (curl_timeout == -1) {
1002 select_timeout.tv_sec = 0;
1003 select_timeout.tv_usec = 50000;
1004 } else {
1005 select_timeout.tv_sec = curl_timeout / 1000;
1006 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1007 }
1008#else
1009 select_timeout.tv_sec = 0;
1010 select_timeout.tv_usec = 50000;
1011#endif
1012 max_fd = -1;
1014 FD_ZERO(&readfds);
1015 FD_ZERO(&writefds);
1016 FD_ZERO(&excfds);
1017 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1018 /*
1020 * It can happen that curl_multi_timeout returns a pathologically
1021 * long timeout when curl_multi_fdset returns no file descriptors
1022 * to read. See commit message for more details.
1023 */
1024 if (max_fd < 0 &&
1025 (select_timeout.tv_sec > 0 ||
1026 select_timeout.tv_usec > 50000)) {
1027 select_timeout.tv_sec = 0;
1028 select_timeout.tv_usec = 50000;
1029 }
1030 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1032 }
1033 }
1034#else
1035 while (slot->in_use) {
1036 slot->curl_result = curl_easy_perform(slot->curl);
1037 finish_active_slot(slot);
1038 }
1039#endif
1040}
1041static void release_active_slot(struct active_request_slot *slot)
1043{
1044 closedown_active_slot(slot);
1045 if (slot->curl && curl_session_count > min_curl_sessions) {
1046#ifdef USE_CURL_MULTI
1047 curl_multi_remove_handle(curlm, slot->curl);
1048#endif
1049 curl_easy_cleanup(slot->curl);
1050 slot->curl = NULL;
1051 curl_session_count--;
1052 }
1053#ifdef USE_CURL_MULTI
1054 fill_active_slots();
1055#endif
1056}
1057void finish_all_active_slots(void)
1059{
1060 struct active_request_slot *slot = active_queue_head;
1061 while (slot != NULL)
1063 if (slot->in_use) {
1064 run_active_slot(slot);
1065 slot = active_queue_head;
1066 } else {
1067 slot = slot->next;
1068 }
1069}
1070/* Helpers for modifying and creating URLs */
1072static inline int needs_quote(int ch)
1073{
1074 if (((ch >= 'A') && (ch <= 'Z'))
1075 || ((ch >= 'a') && (ch <= 'z'))
1076 || ((ch >= '0') && (ch <= '9'))
1077 || (ch == '/')
1078 || (ch == '-')
1079 || (ch == '.'))
1080 return 0;
1081 return 1;
1082}
1083static char *quote_ref_url(const char *base, const char *ref)
1085{
1086 struct strbuf buf = STRBUF_INIT;
1087 const char *cp;
1088 int ch;
1089 end_url_with_slash(&buf, base);
1091 for (cp = ref; (ch = *cp) != 0; cp++)
1093 if (needs_quote(ch))
1094 strbuf_addf(&buf, "%%%02x", ch);
1095 else
1096 strbuf_addch(&buf, *cp);
1097 return strbuf_detach(&buf, NULL);
1099}
1100void append_remote_object_url(struct strbuf *buf, const char *url,
1102 const char *hex,
1103 int only_two_digit_prefix)
1104{
1105 end_url_with_slash(buf, url);
1106 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1108 if (!only_two_digit_prefix)
1109 strbuf_addf(buf, "%s", hex+2);
1110}
1111char *get_remote_object_url(const char *url, const char *hex,
1113 int only_two_digit_prefix)
1114{
1115 struct strbuf buf = STRBUF_INIT;
1116 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1117 return strbuf_detach(&buf, NULL);
1118}
1119static int handle_curl_result(struct slot_results *results)
1121{
1122 /*
1123 * If we see a failing http code with CURLE_OK, we have turned off
1124 * FAILONERROR (to keep the server's custom error response), and should
1125 * translate the code into failure here.
1126 */
1127 if (results->curl_result == CURLE_OK &&
1128 results->http_code >= 400) {
1129 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1130 /*
1131 * Normally curl will already have put the "reason phrase"
1132 * from the server into curl_errorstr; unfortunately without
1133 * FAILONERROR it is lost, so we can give only the numeric
1134 * status code.
1135 */
1136 snprintf(curl_errorstr, sizeof(curl_errorstr),
1137 "The requested URL returned error: %ld",
1138 results->http_code);
1139 }
1140 if (results->curl_result == CURLE_OK) {
1142 credential_approve(&http_auth);
1143 if (proxy_auth.password)
1144 credential_approve(&proxy_auth);
1145 return HTTP_OK;
1146 } else if (missing_target(results))
1147 return HTTP_MISSING_TARGET;
1148 else if (results->http_code == 401) {
1149 if (http_auth.username && http_auth.password) {
1150 credential_reject(&http_auth);
1151 return HTTP_NOAUTH;
1152 } else {
1153#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1154 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1155#endif
1156 return HTTP_REAUTH;
1157 }
1158 } else {
1159 if (results->http_connectcode == 407)
1160 credential_reject(&proxy_auth);
1161#if LIBCURL_VERSION_NUM >= 0x070c00
1162 if (!curl_errorstr[0])
1163 strlcpy(curl_errorstr,
1164 curl_easy_strerror(results->curl_result),
1165 sizeof(curl_errorstr));
1166#endif
1167 return HTTP_ERROR;
1168 }
1169}
1170int run_one_slot(struct active_request_slot *slot,
1172 struct slot_results *results)
1173{
1174 slot->results = results;
1175 if (!start_active_slot(slot)) {
1176 snprintf(curl_errorstr, sizeof(curl_errorstr),
1177 "failed to start HTTP request");
1178 return HTTP_START_FAILED;
1179 }
1180 run_active_slot(slot);
1182 return handle_curl_result(results);
1183}
1184struct curl_slist *http_copy_default_headers(void)
1186{
1187 struct curl_slist *headers = NULL, *h;
1188 for (h = extra_http_headers; h; h = h->next)
1190 headers = curl_slist_append(headers, h->data);
1191 return headers;
1193}
1194static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1196{
1197 char *ptr;
1198 CURLcode ret;
1199 strbuf_reset(buf);
1201 ret = curl_easy_getinfo(curl, info, &ptr);
1202 if (!ret && ptr)
1203 strbuf_addstr(buf, ptr);
1204 return ret;
1205}
1206/*
1208 * Check for and extract a content-type parameter. "raw"
1209 * should be positioned at the start of the potential
1210 * parameter, with any whitespace already removed.
1211 *
1212 * "name" is the name of the parameter. The value is appended
1213 * to "out".
1214 */
1215static int extract_param(const char *raw, const char *name,
1216 struct strbuf *out)
1217{
1218 size_t len = strlen(name);
1219 if (strncasecmp(raw, name, len))
1221 return -1;
1222 raw += len;
1223 if (*raw != '=')
1225 return -1;
1226 raw++;
1227 while (*raw && !isspace(*raw) && *raw != ';')
1229 strbuf_addch(out, *raw++);
1230 return 0;
1231}
1232/*
1234 * Extract a normalized version of the content type, with any
1235 * spaces suppressed, all letters lowercased, and no trailing ";"
1236 * or parameters.
1237 *
1238 * Note that we will silently remove even invalid whitespace. For
1239 * example, "text / plain" is specifically forbidden by RFC 2616,
1240 * but "text/plain" is the only reasonable output, and this keeps
1241 * our code simple.
1242 *
1243 * If the "charset" argument is not NULL, store the value of any
1244 * charset parameter there.
1245 *
1246 * Example:
1247 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1248 * "text / plain" -> "text/plain"
1249 */
1250static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1251 struct strbuf *charset)
1252{
1253 const char *p;
1254 strbuf_reset(type);
1256 strbuf_grow(type, raw->len);
1257 for (p = raw->buf; *p; p++) {
1258 if (isspace(*p))
1259 continue;
1260 if (*p == ';') {
1261 p++;
1262 break;
1263 }
1264 strbuf_addch(type, tolower(*p));
1265 }
1266 if (!charset)
1268 return;
1269 strbuf_reset(charset);
1271 while (*p) {
1272 while (isspace(*p) || *p == ';')
1273 p++;
1274 if (!extract_param(p, "charset", charset))
1275 return;
1276 while (*p && !isspace(*p))
1277 p++;
1278 }
1279 if (!charset->len && starts_with(type->buf, "text/"))
1281 strbuf_addstr(charset, "ISO-8859-1");
1282}
1283static void write_accept_language(struct strbuf *buf)
1285{
1286 /*
1287 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1288 * that, q-value will be smaller than 0.001, the minimum q-value the
1289 * HTTP specification allows. See
1290 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1291 */
1292 const int MAX_DECIMAL_PLACES = 3;
1293 const int MAX_LANGUAGE_TAGS = 1000;
1294 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1295 char **language_tags = NULL;
1296 int num_langs = 0;
1297 const char *s = get_preferred_languages();
1298 int i;
1299 struct strbuf tag = STRBUF_INIT;
1300 /* Don't add Accept-Language header if no language is preferred. */
1302 if (!s)
1303 return;
1304 /*
1306 * Split the colon-separated string of preferred languages into
1307 * language_tags array.
1308 */
1309 do {
1310 /* collect language tag */
1311 for (; *s && (isalnum(*s) || *s == '_'); s++)
1312 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1313 /* skip .codeset, @modifier and any other unnecessary parts */
1315 while (*s && *s != ':')
1316 s++;
1317 if (tag.len) {
1319 num_langs++;
1320 REALLOC_ARRAY(language_tags, num_langs);
1321 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1322 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1323 break;
1324 }
1325 } while (*s++);
1326 /* write Accept-Language header into buf */
1328 if (num_langs) {
1329 int last_buf_len = 0;
1330 int max_q;
1331 int decimal_places;
1332 char q_format[32];
1333 /* add '*' */
1335 REALLOC_ARRAY(language_tags, num_langs + 1);
1336 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1337 /* compute decimal_places */
1339 for (max_q = 1, decimal_places = 0;
1340 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1341 decimal_places++, max_q *= 10)
1342 ;
1343 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1345 strbuf_addstr(buf, "Accept-Language: ");
1347 for (i = 0; i < num_langs; i++) {
1349 if (i > 0)
1350 strbuf_addstr(buf, ", ");
1351 strbuf_addstr(buf, language_tags[i]);
1353 if (i > 0)
1355 strbuf_addf(buf, q_format, max_q - i);
1356 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1358 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1359 break;
1360 }
1361 last_buf_len = buf->len;
1363 }
1364 }
1365 /* free language tags -- last one is a static '*' */
1367 for (i = 0; i < num_langs - 1; i++)
1368 free(language_tags[i]);
1369 free(language_tags);
1370}
1371/*
1373 * Get an Accept-Language header which indicates user's preferred languages.
1374 *
1375 * Examples:
1376 * LANGUAGE= -> ""
1377 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1378 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1379 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1380 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1381 * LANGUAGE= LANG=C -> ""
1382 */
1383static const char *get_accept_language(void)
1384{
1385 if (!cached_accept_language) {
1386 struct strbuf buf = STRBUF_INIT;
1387 write_accept_language(&buf);
1388 if (buf.len > 0)
1389 cached_accept_language = strbuf_detach(&buf, NULL);
1390 }
1391 return cached_accept_language;
1393}
1394static void http_opt_request_remainder(CURL *curl, off_t pos)
1396{
1397 char buf[128];
1398 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1399 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1400}
1401/* http_request() targets */
1403#define HTTP_REQUEST_STRBUF 0
1404#define HTTP_REQUEST_FILE 1
1405static int http_request(const char *url,
1407 void *result, int target,
1408 const struct http_get_options *options)
1409{
1410 struct active_request_slot *slot;
1411 struct slot_results results;
1412 struct curl_slist *headers = http_copy_default_headers();
1413 struct strbuf buf = STRBUF_INIT;
1414 const char *accept_language;
1415 int ret;
1416 slot = get_active_slot();
1418 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1419 if (result == NULL) {
1421 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1422 } else {
1423 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1424 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1425 if (target == HTTP_REQUEST_FILE) {
1427 off_t posn = ftello(result);
1428 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1429 fwrite);
1430 if (posn > 0)
1431 http_opt_request_remainder(slot->curl, posn);
1432 } else
1433 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1434 fwrite_buffer);
1435 }
1436 accept_language = get_accept_language();
1438 if (accept_language)
1440 headers = curl_slist_append(headers, accept_language);
1441 strbuf_addstr(&buf, "Pragma:");
1443 if (options && options->no_cache)
1444 strbuf_addstr(&buf, " no-cache");
1445 if (options && options->keep_error)
1446 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1447 headers = curl_slist_append(headers, buf.buf);
1449 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1451 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1452 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1453 ret = run_one_slot(slot, &results);
1455 if (options && options->content_type) {
1457 struct strbuf raw = STRBUF_INIT;
1458 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1459 extract_content_type(&raw, options->content_type,
1460 options->charset);
1461 strbuf_release(&raw);
1462 }
1463 if (options && options->effective_url)
1465 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1466 options->effective_url);
1467 curl_slist_free_all(headers);
1469 strbuf_release(&buf);
1470 return ret;
1472}
1473/*
1475 * Update the "base" url to a more appropriate value, as deduced by
1476 * redirects seen when requesting a URL starting with "url".
1477 *
1478 * The "asked" parameter is a URL that we asked curl to access, and must begin
1479 * with "base".
1480 *
1481 * The "got" parameter is the URL that curl reported to us as where we ended
1482 * up.
1483 *
1484 * Returns 1 if we updated the base url, 0 otherwise.
1485 *
1486 * Our basic strategy is to compare "base" and "asked" to find the bits
1487 * specific to our request. We then strip those bits off of "got" to yield the
1488 * new base. So for example, if our base is "http://example.com/foo.git",
1489 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1490 * with "https://other.example.com/foo.git/info/refs". We would want the
1491 * new URL to become "https://other.example.com/foo.git".
1492 *
1493 * Note that this assumes a sane redirect scheme. It's entirely possible
1494 * in the example above to end up at a URL that does not even end in
1495 * "info/refs". In such a case we simply punt, as there is not much we can
1496 * do (and such a scheme is unlikely to represent a real git repository,
1497 * which means we are likely about to abort anyway).
1498 */
1499static int update_url_from_redirect(struct strbuf *base,
1500 const char *asked,
1501 const struct strbuf *got)
1502{
1503 const char *tail;
1504 size_t tail_len;
1505 if (!strcmp(asked, got->buf))
1507 return 0;
1508 if (!skip_prefix(asked, base->buf, &tail))
1510 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1511 asked, base->buf);
1512 tail_len = strlen(tail);
1514 if (got->len < tail_len ||
1516 strcmp(tail, got->buf + got->len - tail_len))
1517 return 0; /* insane redirect scheme */
1518 strbuf_reset(base);
1520 strbuf_add(base, got->buf, got->len - tail_len);
1521 return 1;
1522}
1523static int http_request_reauth(const char *url,
1525 void *result, int target,
1526 struct http_get_options *options)
1527{
1528 int ret = http_request(url, result, target, options);
1529 if (options && options->effective_url && options->base_url) {
1531 if (update_url_from_redirect(options->base_url,
1532 url, options->effective_url)) {
1533 credential_from_url(&http_auth, options->base_url->buf);
1534 url = options->effective_url->buf;
1535 }
1536 }
1537 if (ret != HTTP_REAUTH)
1539 return ret;
1540 /*
1542 * If we are using KEEP_ERROR, the previous request may have
1543 * put cruft into our output stream; we should clear it out before
1544 * making our next request. We only know how to do this for
1545 * the strbuf case, but that is enough to satisfy current callers.
1546 */
1547 if (options && options->keep_error) {
1548 switch (target) {
1549 case HTTP_REQUEST_STRBUF:
1550 strbuf_reset(result);
1551 break;
1552 default:
1553 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1554 }
1555 }
1556 credential_fill(&http_auth);
1558 return http_request(url, result, target, options);
1560}
1561int http_get_strbuf(const char *url,
1563 struct strbuf *result,
1564 struct http_get_options *options)
1565{
1566 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1567}
1568/*
1570 * Downloads a URL and stores the result in the given file.
1571 *
1572 * If a previous interrupted download is detected (i.e. a previous temporary
1573 * file is still around) the download is resumed.
1574 */
1575static int http_get_file(const char *url, const char *filename,
1576 struct http_get_options *options)
1577{
1578 int ret;
1579 struct strbuf tmpfile = STRBUF_INIT;
1580 FILE *result;
1581 strbuf_addf(&tmpfile, "%s.temp", filename);
1583 result = fopen(tmpfile.buf, "a");
1584 if (!result) {
1585 error("Unable to open local file %s", tmpfile.buf);
1586 ret = HTTP_ERROR;
1587 goto cleanup;
1588 }
1589 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1591 fclose(result);
1592 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1594 ret = HTTP_ERROR;
1595cleanup:
1596 strbuf_release(&tmpfile);
1597 return ret;
1598}
1599int http_fetch_ref(const char *base, struct ref *ref)
1601{
1602 struct http_get_options options = {0};
1603 char *url;
1604 struct strbuf buffer = STRBUF_INIT;
1605 int ret = -1;
1606 options.no_cache = 1;
1608 url = quote_ref_url(base, ref->name);
1610 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1611 strbuf_rtrim(&buffer);
1612 if (buffer.len == 40)
1613 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1614 else if (starts_with(buffer.buf, "ref: ")) {
1615 ref->symref = xstrdup(buffer.buf + 5);
1616 ret = 0;
1617 }
1618 }
1619 strbuf_release(&buffer);
1621 free(url);
1622 return ret;
1623}
1624/* Helpers for fetching packs */
1626static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1627{
1628 char *url, *tmp;
1629 struct strbuf buf = STRBUF_INIT;
1630 if (http_is_verbose)
1632 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1633 end_url_with_slash(&buf, base_url);
1635 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1636 url = strbuf_detach(&buf, NULL);
1637 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1639 tmp = strbuf_detach(&buf, NULL);
1640 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1642 error("Unable to get pack index %s", url);
1643 free(tmp);
1644 tmp = NULL;
1645 }
1646 free(url);
1648 return tmp;
1649}
1650static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1652 unsigned char *sha1, const char *base_url)
1653{
1654 struct packed_git *new_pack;
1655 char *tmp_idx = NULL;
1656 int ret;
1657 if (has_pack_index(sha1)) {
1659 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1660 if (!new_pack)
1661 return -1; /* parse_pack_index() already issued error message */
1662 goto add_pack;
1663 }
1664 tmp_idx = fetch_pack_index(sha1, base_url);
1666 if (!tmp_idx)
1667 return -1;
1668 new_pack = parse_pack_index(sha1, tmp_idx);
1670 if (!new_pack) {
1671 unlink(tmp_idx);
1672 free(tmp_idx);
1673 return -1; /* parse_pack_index() already issued error message */
1675 }
1676 ret = verify_pack_index(new_pack);
1678 if (!ret) {
1679 close_pack_index(new_pack);
1680 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1681 }
1682 free(tmp_idx);
1683 if (ret)
1684 return -1;
1685add_pack:
1687 new_pack->next = *packs_head;
1688 *packs_head = new_pack;
1689 return 0;
1690}
1691int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1693{
1694 struct http_get_options options = {0};
1695 int ret = 0, i = 0;
1696 char *url, *data;
1697 struct strbuf buf = STRBUF_INIT;
1698 unsigned char sha1[20];
1699 end_url_with_slash(&buf, base_url);
1701 strbuf_addstr(&buf, "objects/info/packs");
1702 url = strbuf_detach(&buf, NULL);
1703 options.no_cache = 1;
1705 ret = http_get_strbuf(url, &buf, &options);
1706 if (ret != HTTP_OK)
1707 goto cleanup;
1708 data = buf.buf;
1710 while (i < buf.len) {
1711 switch (data[i]) {
1712 case 'P':
1713 i++;
1714 if (i + 52 <= buf.len &&
1715 starts_with(data + i, " pack-") &&
1716 starts_with(data + i + 46, ".pack\n")) {
1717 get_sha1_hex(data + i + 6, sha1);
1718 fetch_and_setup_pack_index(packs_head, sha1,
1719 base_url);
1720 i += 51;
1721 break;
1722 }
1723 default:
1724 while (i < buf.len && data[i] != '\n')
1725 i++;
1726 }
1727 i++;
1728 }
1729cleanup:
1731 free(url);
1732 return ret;
1733}
1734void release_http_pack_request(struct http_pack_request *preq)
1736{
1737 if (preq->packfile != NULL) {
1738 fclose(preq->packfile);
1739 preq->packfile = NULL;
1740 }
1741 preq->slot = NULL;
1742 free(preq->url);
1743 free(preq);
1744}
1745int finish_http_pack_request(struct http_pack_request *preq)
1747{
1748 struct packed_git **lst;
1749 struct packed_git *p = preq->target;
1750 char *tmp_idx;
1751 size_t len;
1752 struct child_process ip = CHILD_PROCESS_INIT;
1753 const char *ip_argv[8];
1754 close_pack_index(p);
1756 fclose(preq->packfile);
1758 preq->packfile = NULL;
1759 lst = preq->lst;
1761 while (*lst != p)
1762 lst = &((*lst)->next);
1763 *lst = (*lst)->next;
1764 if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1766 die("BUG: pack tmpfile does not end in .pack.temp?");
1767 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1768 ip_argv[0] = "index-pack";
1770 ip_argv[1] = "-o";
1771 ip_argv[2] = tmp_idx;
1772 ip_argv[3] = preq->tmpfile;
1773 ip_argv[4] = NULL;
1774 ip.argv = ip_argv;
1776 ip.git_cmd = 1;
1777 ip.no_stdin = 1;
1778 ip.no_stdout = 1;
1779 if (run_command(&ip)) {
1781 unlink(preq->tmpfile);
1782 unlink(tmp_idx);
1783 free(tmp_idx);
1784 return -1;
1785 }
1786 unlink(sha1_pack_index_name(p->sha1));
1788 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1790 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1791 free(tmp_idx);
1792 return -1;
1793 }
1794 install_packed_git(p);
1796 free(tmp_idx);
1797 return 0;
1798}
1799struct http_pack_request *new_http_pack_request(
1801 struct packed_git *target, const char *base_url)
1802{
1803 off_t prev_posn = 0;
1804 struct strbuf buf = STRBUF_INIT;
1805 struct http_pack_request *preq;
1806 preq = xcalloc(1, sizeof(*preq));
1808 preq->target = target;
1809 end_url_with_slash(&buf, base_url);
1811 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1812 sha1_to_hex(target->sha1));
1813 preq->url = strbuf_detach(&buf, NULL);
1814 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1816 sha1_pack_name(target->sha1));
1817 preq->packfile = fopen(preq->tmpfile, "a");
1818 if (!preq->packfile) {
1819 error("Unable to open local file %s for pack",
1820 preq->tmpfile);
1821 goto abort;
1822 }
1823 preq->slot = get_active_slot();
1825 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1826 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1827 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1828 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1829 no_pragma_header);
1830 /*
1832 * If there is data present from a previous transfer attempt,
1833 * resume where it left off
1834 */
1835 prev_posn = ftello(preq->packfile);
1836 if (prev_posn>0) {
1837 if (http_is_verbose)
1838 fprintf(stderr,
1839 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
1840 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
1841 http_opt_request_remainder(preq->slot->curl, prev_posn);
1842 }
1843 return preq;
1845abort:
1847 free(preq->url);
1848 free(preq);
1849 return NULL;
1850}
1851/* Helpers for fetching objects (loose) */
1853static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1854 void *data)
1855{
1856 unsigned char expn[4096];
1857 size_t size = eltsize * nmemb;
1858 int posn = 0;
1859 struct http_object_request *freq =
1860 (struct http_object_request *)data;
1861 do {
1862 ssize_t retval = xwrite(freq->localfile,
1863 (char *) ptr + posn, size - posn);
1864 if (retval < 0)
1865 return posn;
1866 posn += retval;
1867 } while (posn < size);
1868 freq->stream.avail_in = size;
1870 freq->stream.next_in = (void *)ptr;
1871 do {
1872 freq->stream.next_out = expn;
1873 freq->stream.avail_out = sizeof(expn);
1874 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1875 git_SHA1_Update(&freq->c, expn,
1876 sizeof(expn) - freq->stream.avail_out);
1877 } while (freq->stream.avail_in && freq->zret == Z_OK);
1878 return size;
1879}
1880struct http_object_request *new_http_object_request(const char *base_url,
1882 unsigned char *sha1)
1883{
1884 char *hex = sha1_to_hex(sha1);
1885 const char *filename;
1886 char prevfile[PATH_MAX];
1887 int prevlocal;
1888 char prev_buf[PREV_BUF_SIZE];
1889 ssize_t prev_read = 0;
1890 off_t prev_posn = 0;
1891 struct http_object_request *freq;
1892 freq = xcalloc(1, sizeof(*freq));
1894 hashcpy(freq->sha1, sha1);
1895 freq->localfile = -1;
1896 filename = sha1_file_name(sha1);
1898 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1899 "%s.temp", filename);
1900 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1902 unlink_or_warn(prevfile);
1903 rename(freq->tmpfile, prevfile);
1904 unlink_or_warn(freq->tmpfile);
1905 if (freq->localfile != -1)
1907 error("fd leakage in start: %d", freq->localfile);
1908 freq->localfile = open(freq->tmpfile,
1909 O_WRONLY | O_CREAT | O_EXCL, 0666);
1910 /*
1911 * This could have failed due to the "lazy directory creation";
1912 * try to mkdir the last path component.
1913 */
1914 if (freq->localfile < 0 && errno == ENOENT) {
1915 char *dir = strrchr(freq->tmpfile, '/');
1916 if (dir) {
1917 *dir = 0;
1918 mkdir(freq->tmpfile, 0777);
1919 *dir = '/';
1920 }
1921 freq->localfile = open(freq->tmpfile,
1922 O_WRONLY | O_CREAT | O_EXCL, 0666);
1923 }
1924 if (freq->localfile < 0) {
1926 error("Couldn't create temporary file %s: %s",
1927 freq->tmpfile, strerror(errno));
1928 goto abort;
1929 }
1930 git_inflate_init(&freq->stream);
1932 git_SHA1_Init(&freq->c);
1934 freq->url = get_remote_object_url(base_url, hex, 0);
1936 /*
1938 * If a previous temp file is present, process what was already
1939 * fetched.
1940 */
1941 prevlocal = open(prevfile, O_RDONLY);
1942 if (prevlocal != -1) {
1943 do {
1944 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1945 if (prev_read>0) {
1946 if (fwrite_sha1_file(prev_buf,
1947 1,
1948 prev_read,
1949 freq) == prev_read) {
1950 prev_posn += prev_read;
1951 } else {
1952 prev_read = -1;
1953 }
1954 }
1955 } while (prev_read > 0);
1956 close(prevlocal);
1957 }
1958 unlink_or_warn(prevfile);
1959 /*
1961 * Reset inflate/SHA1 if there was an error reading the previous temp
1962 * file; also rewind to the beginning of the local file.
1963 */
1964 if (prev_read == -1) {
1965 memset(&freq->stream, 0, sizeof(freq->stream));
1966 git_inflate_init(&freq->stream);
1967 git_SHA1_Init(&freq->c);
1968 if (prev_posn>0) {
1969 prev_posn = 0;
1970 lseek(freq->localfile, 0, SEEK_SET);
1971 if (ftruncate(freq->localfile, 0) < 0) {
1972 error("Couldn't truncate temporary file %s: %s",
1973 freq->tmpfile, strerror(errno));
1974 goto abort;
1975 }
1976 }
1977 }
1978 freq->slot = get_active_slot();
1980 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1982 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1983 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1984 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1985 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1986 /*
1988 * If we have successfully processed data from a previous fetch
1989 * attempt, only fetch the data we don't already have.
1990 */
1991 if (prev_posn>0) {
1992 if (http_is_verbose)
1993 fprintf(stderr,
1994 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
1995 hex, (uintmax_t)prev_posn);
1996 http_opt_request_remainder(freq->slot->curl, prev_posn);
1997 }
1998 return freq;
2000abort:
2002 free(freq->url);
2003 free(freq);
2004 return NULL;
2005}
2006void process_http_object_request(struct http_object_request *freq)
2008{
2009 if (freq->slot == NULL)
2010 return;
2011 freq->curl_result = freq->slot->curl_result;
2012 freq->http_code = freq->slot->http_code;
2013 freq->slot = NULL;
2014}
2015int finish_http_object_request(struct http_object_request *freq)
2017{
2018 struct stat st;
2019 close(freq->localfile);
2021 freq->localfile = -1;
2022 process_http_object_request(freq);
2024 if (freq->http_code == 416) {
2026 warning("requested range invalid; we may already have all the data.");
2027 } else if (freq->curl_result != CURLE_OK) {
2028 if (stat(freq->tmpfile, &st) == 0)
2029 if (st.st_size == 0)
2030 unlink_or_warn(freq->tmpfile);
2031 return -1;
2032 }
2033 git_inflate_end(&freq->stream);
2035 git_SHA1_Final(freq->real_sha1, &freq->c);
2036 if (freq->zret != Z_STREAM_END) {
2037 unlink_or_warn(freq->tmpfile);
2038 return -1;
2039 }
2040 if (hashcmp(freq->sha1, freq->real_sha1)) {
2041 unlink_or_warn(freq->tmpfile);
2042 return -1;
2043 }
2044 freq->rename =
2045 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2046 return freq->rename;
2048}
2049void abort_http_object_request(struct http_object_request *freq)
2051{
2052 unlink_or_warn(freq->tmpfile);
2053 release_http_object_request(freq);
2055}
2056void release_http_object_request(struct http_object_request *freq)
2058{
2059 if (freq->localfile != -1) {
2060 close(freq->localfile);
2061 freq->localfile = -1;
2062 }
2063 if (freq->url != NULL) {
2064 free(freq->url);
2065 freq->url = NULL;
2066 }
2067 if (freq->slot != NULL) {
2068 freq->slot->callback_func = NULL;
2069 freq->slot->callback_data = NULL;
2070 release_active_slot(freq->slot);
2071 freq->slot = NULL;
2072 }
2073}