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git.spec.in: use README.md, not README
[git.git] / http.c
blobdfc53c1e2554e76126459d6cb1f098facac28593
1 #include "git-compat-util.h"
2 #include "http.h"
3 #include "pack.h"
4 #include "sideband.h"
5 #include "run-command.h"
6 #include "url.h"
7 #include "urlmatch.h"
8 #include "credential.h"
9 #include "version.h"
10 #include "pkt-line.h"
11 #include "gettext.h"
12 #include "transport.h"
13
14 int active_requests;
15 int http_is_verbose;
16 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
17
18 #if LIBCURL_VERSION_NUM >= 0x070a06
19 #define LIBCURL_CAN_HANDLE_AUTH_ANY
20 #endif
21
22 static int min_curl_sessions = 1;
23 static int curl_session_count;
24 #ifdef USE_CURL_MULTI
25 static int max_requests = -1;
26 static CURLM *curlm;
27 #endif
28 #ifndef NO_CURL_EASY_DUPHANDLE
29 static CURL *curl_default;
30 #endif
31
32 #define PREV_BUF_SIZE 4096
33
34 char curl_errorstr[CURL_ERROR_SIZE];
35
36 static int curl_ssl_verify = -1;
37 static int curl_ssl_try;
38 static const char *ssl_cert;
39 static const char *ssl_cipherlist;
40 static const char *ssl_version;
41 static struct {
42 const char *name;
43 long ssl_version;
44 } sslversions[] = {
45 { "sslv2", CURL_SSLVERSION_SSLv2 },
46 { "sslv3", CURL_SSLVERSION_SSLv3 },
47 { "tlsv1", CURL_SSLVERSION_TLSv1 },
48 #if LIBCURL_VERSION_NUM >= 0x072200
49 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
50 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
51 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
52 #endif
53 };
54 #if LIBCURL_VERSION_NUM >= 0x070903
55 static const char *ssl_key;
56 #endif
57 #if LIBCURL_VERSION_NUM >= 0x070908
58 static const char *ssl_capath;
59 #endif
60 static const char *ssl_cainfo;
61 static long curl_low_speed_limit = -1;
62 static long curl_low_speed_time = -1;
63 static int curl_ftp_no_epsv;
64 static const char *curl_http_proxy;
65 static const char *http_proxy_authmethod;
66 static struct {
67 const char *name;
68 long curlauth_param;
69 } proxy_authmethods[] = {
70 { "basic", CURLAUTH_BASIC },
71 { "digest", CURLAUTH_DIGEST },
72 { "negotiate", CURLAUTH_GSSNEGOTIATE },
73 { "ntlm", CURLAUTH_NTLM },
74 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
75 { "anyauth", CURLAUTH_ANY },
76 #endif
77 /*
78 * CURLAUTH_DIGEST_IE has no corresponding command-line option in
79 * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
80 * here, too
81 */
82 };
83 static struct credential proxy_auth = CREDENTIAL_INIT;
84 static const char *curl_proxyuserpwd;
85 static const char *curl_cookie_file;
86 static int curl_save_cookies;
87 struct credential http_auth = CREDENTIAL_INIT;
88 static int http_proactive_auth;
89 static const char *user_agent;
90
91 #if LIBCURL_VERSION_NUM >= 0x071700
92 /* Use CURLOPT_KEYPASSWD as is */
93 #elif LIBCURL_VERSION_NUM >= 0x070903
94 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
95 #else
96 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
97 #endif
98
99 static struct credential cert_auth = CREDENTIAL_INIT;
100 static int ssl_cert_password_required;
101 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
102 static unsigned long http_auth_methods = CURLAUTH_ANY;
103 #endif
104
105 static struct curl_slist *pragma_header;
106 static struct curl_slist *no_pragma_header;
107
108 static struct active_request_slot *active_queue_head;
109
110 static char *cached_accept_language;
111
112 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
113 {
114 size_t size = eltsize * nmemb;
115 struct buffer *buffer = buffer_;
116
117 if (size > buffer->buf.len - buffer->posn)
118 size = buffer->buf.len - buffer->posn;
119 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
120 buffer->posn += size;
121
122 return size;
123 }
124
125 #ifndef NO_CURL_IOCTL
126 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
127 {
128 struct buffer *buffer = clientp;
129
130 switch (cmd) {
131 case CURLIOCMD_NOP:
132 return CURLIOE_OK;
133
134 case CURLIOCMD_RESTARTREAD:
135 buffer->posn = 0;
136 return CURLIOE_OK;
137
138 default:
139 return CURLIOE_UNKNOWNCMD;
140 }
141 }
142 #endif
143
144 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
145 {
146 size_t size = eltsize * nmemb;
147 struct strbuf *buffer = buffer_;
148
149 strbuf_add(buffer, ptr, size);
150 return size;
151 }
152
153 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
154 {
155 return eltsize * nmemb;
156 }
157
158 static void closedown_active_slot(struct active_request_slot *slot)
159 {
160 active_requests--;
161 slot->in_use = 0;
162 }
163
164 static void finish_active_slot(struct active_request_slot *slot)
165 {
166 closedown_active_slot(slot);
167 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
168
169 if (slot->finished != NULL)
170 (*slot->finished) = 1;
171
172 /* Store slot results so they can be read after the slot is reused */
173 if (slot->results != NULL) {
174 slot->results->curl_result = slot->curl_result;
175 slot->results->http_code = slot->http_code;
176 #if LIBCURL_VERSION_NUM >= 0x070a08
177 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
178 &slot->results->auth_avail);
179 #else
180 slot->results->auth_avail = 0;
181 #endif
182
183 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
184 &slot->results->http_connectcode);
185 }
186
187 /* Run callback if appropriate */
188 if (slot->callback_func != NULL)
189 slot->callback_func(slot->callback_data);
190 }
191
192 #ifdef USE_CURL_MULTI
193 static void process_curl_messages(void)
194 {
195 int num_messages;
196 struct active_request_slot *slot;
197 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
198
199 while (curl_message != NULL) {
200 if (curl_message->msg == CURLMSG_DONE) {
201 int curl_result = curl_message->data.result;
202 slot = active_queue_head;
203 while (slot != NULL &&
204 slot->curl != curl_message->easy_handle)
205 slot = slot->next;
206 if (slot != NULL) {
207 curl_multi_remove_handle(curlm, slot->curl);
208 slot->curl_result = curl_result;
209 finish_active_slot(slot);
210 } else {
211 fprintf(stderr, "Received DONE message for unknown request!\n");
212 }
213 } else {
214 fprintf(stderr, "Unknown CURL message received: %d\n",
215 (int)curl_message->msg);
216 }
217 curl_message = curl_multi_info_read(curlm, &num_messages);
218 }
219 }
220 #endif
221
222 static int http_options(const char *var, const char *value, void *cb)
223 {
224 if (!strcmp("http.sslverify", var)) {
225 curl_ssl_verify = git_config_bool(var, value);
226 return 0;
227 }
228 if (!strcmp("http.sslcipherlist", var))
229 return git_config_string(&ssl_cipherlist, var, value);
230 if (!strcmp("http.sslversion", var))
231 return git_config_string(&ssl_version, var, value);
232 if (!strcmp("http.sslcert", var))
233 return git_config_string(&ssl_cert, var, value);
234 #if LIBCURL_VERSION_NUM >= 0x070903
235 if (!strcmp("http.sslkey", var))
236 return git_config_string(&ssl_key, var, value);
237 #endif
238 #if LIBCURL_VERSION_NUM >= 0x070908
239 if (!strcmp("http.sslcapath", var))
240 return git_config_pathname(&ssl_capath, var, value);
241 #endif
242 if (!strcmp("http.sslcainfo", var))
243 return git_config_pathname(&ssl_cainfo, var, value);
244 if (!strcmp("http.sslcertpasswordprotected", var)) {
245 ssl_cert_password_required = git_config_bool(var, value);
246 return 0;
247 }
248 if (!strcmp("http.ssltry", var)) {
249 curl_ssl_try = git_config_bool(var, value);
250 return 0;
251 }
252 if (!strcmp("http.minsessions", var)) {
253 min_curl_sessions = git_config_int(var, value);
254 #ifndef USE_CURL_MULTI
255 if (min_curl_sessions > 1)
256 min_curl_sessions = 1;
257 #endif
258 return 0;
259 }
260 #ifdef USE_CURL_MULTI
261 if (!strcmp("http.maxrequests", var)) {
262 max_requests = git_config_int(var, value);
263 return 0;
264 }
265 #endif
266 if (!strcmp("http.lowspeedlimit", var)) {
267 curl_low_speed_limit = (long)git_config_int(var, value);
268 return 0;
269 }
270 if (!strcmp("http.lowspeedtime", var)) {
271 curl_low_speed_time = (long)git_config_int(var, value);
272 return 0;
273 }
274
275 if (!strcmp("http.noepsv", var)) {
276 curl_ftp_no_epsv = git_config_bool(var, value);
277 return 0;
278 }
279 if (!strcmp("http.proxy", var))
280 return git_config_string(&curl_http_proxy, var, value);
281
282 if (!strcmp("http.proxyauthmethod", var))
283 return git_config_string(&http_proxy_authmethod, var, value);
284
285 if (!strcmp("http.cookiefile", var))
286 return git_config_string(&curl_cookie_file, var, value);
287 if (!strcmp("http.savecookies", var)) {
288 curl_save_cookies = git_config_bool(var, value);
289 return 0;
290 }
291
292 if (!strcmp("http.postbuffer", var)) {
293 http_post_buffer = git_config_int(var, value);
294 if (http_post_buffer < LARGE_PACKET_MAX)
295 http_post_buffer = LARGE_PACKET_MAX;
296 return 0;
297 }
298
299 if (!strcmp("http.useragent", var))
300 return git_config_string(&user_agent, var, value);
301
302 /* Fall back on the default ones */
303 return git_default_config(var, value, cb);
304 }
305
306 static void init_curl_http_auth(CURL *result)
307 {
308 if (!http_auth.username)
309 return;
310
311 credential_fill(&http_auth);
312
313 #if LIBCURL_VERSION_NUM >= 0x071301
314 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
315 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
316 #else
317 {
318 static struct strbuf up = STRBUF_INIT;
319 /*
320 * Note that we assume we only ever have a single set of
321 * credentials in a given program run, so we do not have
322 * to worry about updating this buffer, only setting its
323 * initial value.
324 */
325 if (!up.len)
326 strbuf_addf(&up, "%s:%s",
327 http_auth.username, http_auth.password);
328 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
329 }
330 #endif
331 }
332
333 /* *var must be free-able */
334 static void var_override(const char **var, char *value)
335 {
336 if (value) {
337 free((void *)*var);
338 *var = xstrdup(value);
339 }
340 }
341
342 static void set_proxyauth_name_password(CURL *result)
343 {
344 #if LIBCURL_VERSION_NUM >= 0x071301
345 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
346 proxy_auth.username);
347 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
348 proxy_auth.password);
349 #else
350 struct strbuf s = STRBUF_INIT;
351
352 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
353 strbuf_addch(&s, ':');
354 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
355 curl_proxyuserpwd = strbuf_detach(&s, NULL);
356 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
357 #endif
358 }
359
360 static void init_curl_proxy_auth(CURL *result)
361 {
362 if (proxy_auth.username) {
363 if (!proxy_auth.password)
364 credential_fill(&proxy_auth);
365 set_proxyauth_name_password(result);
366 }
367
368 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
369
370 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
371 if (http_proxy_authmethod) {
372 int i;
373 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
374 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
375 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
376 proxy_authmethods[i].curlauth_param);
377 break;
378 }
379 }
380 if (i == ARRAY_SIZE(proxy_authmethods)) {
381 warning("unsupported proxy authentication method %s: using anyauth",
382 http_proxy_authmethod);
383 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
384 }
385 }
386 else
387 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
388 #endif
389 }
390
391 static int has_cert_password(void)
392 {
393 if (ssl_cert == NULL || ssl_cert_password_required != 1)
394 return 0;
395 if (!cert_auth.password) {
396 cert_auth.protocol = xstrdup("cert");
397 cert_auth.username = xstrdup("");
398 cert_auth.path = xstrdup(ssl_cert);
399 credential_fill(&cert_auth);
400 }
401 return 1;
402 }
403
404 #if LIBCURL_VERSION_NUM >= 0x071900
405 static void set_curl_keepalive(CURL *c)
406 {
407 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
408 }
409
410 #elif LIBCURL_VERSION_NUM >= 0x071000
411 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
412 {
413 int ka = 1;
414 int rc;
415 socklen_t len = (socklen_t)sizeof(ka);
416
417 if (type != CURLSOCKTYPE_IPCXN)
418 return 0;
419
420 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
421 if (rc < 0)
422 warning("unable to set SO_KEEPALIVE on socket %s",
423 strerror(errno));
424
425 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
426 }
427
428 static void set_curl_keepalive(CURL *c)
429 {
430 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
431 }
432
433 #else
434 static void set_curl_keepalive(CURL *c)
435 {
436 /* not supported on older curl versions */
437 }
438 #endif
439
440 static CURL *get_curl_handle(void)
441 {
442 CURL *result = curl_easy_init();
443 long allowed_protocols = 0;
444
445 if (!result)
446 die("curl_easy_init failed");
447
448 if (!curl_ssl_verify) {
449 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
450 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
451 } else {
452 /* Verify authenticity of the peer's certificate */
453 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
454 /* The name in the cert must match whom we tried to connect */
455 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
456 }
457
458 #if LIBCURL_VERSION_NUM >= 0x070907
459 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
460 #endif
461 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
462 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
463 #endif
464
465 if (http_proactive_auth)
466 init_curl_http_auth(result);
467
468 if (getenv("GIT_SSL_VERSION"))
469 ssl_version = getenv("GIT_SSL_VERSION");
470 if (ssl_version && *ssl_version) {
471 int i;
472 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
473 if (!strcmp(ssl_version, sslversions[i].name)) {
474 curl_easy_setopt(result, CURLOPT_SSLVERSION,
475 sslversions[i].ssl_version);
476 break;
477 }
478 }
479 if (i == ARRAY_SIZE(sslversions))
480 warning("unsupported ssl version %s: using default",
481 ssl_version);
482 }
483
484 if (getenv("GIT_SSL_CIPHER_LIST"))
485 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
486 if (ssl_cipherlist != NULL && *ssl_cipherlist)
487 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
488 ssl_cipherlist);
489
490 if (ssl_cert != NULL)
491 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
492 if (has_cert_password())
493 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
494 #if LIBCURL_VERSION_NUM >= 0x070903
495 if (ssl_key != NULL)
496 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
497 #endif
498 #if LIBCURL_VERSION_NUM >= 0x070908
499 if (ssl_capath != NULL)
500 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
501 #endif
502 if (ssl_cainfo != NULL)
503 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
504
505 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
506 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
507 curl_low_speed_limit);
508 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
509 curl_low_speed_time);
510 }
511
512 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
513 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
514 #if LIBCURL_VERSION_NUM >= 0x071301
515 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
516 #elif LIBCURL_VERSION_NUM >= 0x071101
517 curl_easy_setopt(result, CURLOPT_POST301, 1);
518 #endif
519 #if LIBCURL_VERSION_NUM >= 0x071304
520 if (is_transport_allowed("http"))
521 allowed_protocols |= CURLPROTO_HTTP;
522 if (is_transport_allowed("https"))
523 allowed_protocols |= CURLPROTO_HTTPS;
524 if (is_transport_allowed("ftp"))
525 allowed_protocols |= CURLPROTO_FTP;
526 if (is_transport_allowed("ftps"))
527 allowed_protocols |= CURLPROTO_FTPS;
528 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
529 #else
530 if (transport_restrict_protocols())
531 warning("protocol restrictions not applied to curl redirects because\n"
532 "your curl version is too old (>= 7.19.4)");
533 #endif
534
535 if (getenv("GIT_CURL_VERBOSE"))
536 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
537
538 curl_easy_setopt(result, CURLOPT_USERAGENT,
539 user_agent ? user_agent : git_user_agent());
540
541 if (curl_ftp_no_epsv)
542 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
543
544 #ifdef CURLOPT_USE_SSL
545 if (curl_ssl_try)
546 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
547 #endif
548
549 /*
550 * CURL also examines these variables as a fallback; but we need to query
551 * them here in order to decide whether to prompt for missing password (cf.
552 * init_curl_proxy_auth()).
553 *
554 * Unlike many other common environment variables, these are historically
555 * lowercase only. It appears that CURL did not know this and implemented
556 * only uppercase variants, which was later corrected to take both - with
557 * the exception of http_proxy, which is lowercase only also in CURL. As
558 * the lowercase versions are the historical quasi-standard, they take
559 * precedence here, as in CURL.
560 */
561 if (!curl_http_proxy) {
562 if (!strcmp(http_auth.protocol, "https")) {
563 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
564 var_override(&curl_http_proxy, getenv("https_proxy"));
565 } else {
566 var_override(&curl_http_proxy, getenv("http_proxy"));
567 }
568 if (!curl_http_proxy) {
569 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
570 var_override(&curl_http_proxy, getenv("all_proxy"));
571 }
572 }
573
574 if (curl_http_proxy) {
575 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
576 #if LIBCURL_VERSION_NUM >= 0x071800
577 if (starts_with(curl_http_proxy, "socks5"))
578 curl_easy_setopt(result,
579 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
580 else if (starts_with(curl_http_proxy, "socks4a"))
581 curl_easy_setopt(result,
582 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
583 else if (starts_with(curl_http_proxy, "socks"))
584 curl_easy_setopt(result,
585 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
586 #endif
587 if (strstr(curl_http_proxy, "://"))
588 credential_from_url(&proxy_auth, curl_http_proxy);
589 else {
590 struct strbuf url = STRBUF_INIT;
591 strbuf_addf(&url, "http://%s", curl_http_proxy);
592 credential_from_url(&proxy_auth, url.buf);
593 strbuf_release(&url);
594 }
595
596 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
597 }
598 init_curl_proxy_auth(result);
599
600 set_curl_keepalive(result);
601
602 return result;
603 }
604
605 static void set_from_env(const char **var, const char *envname)
606 {
607 const char *val = getenv(envname);
608 if (val)
609 *var = val;
610 }
611
612 void http_init(struct remote *remote, const char *url, int proactive_auth)
613 {
614 char *low_speed_limit;
615 char *low_speed_time;
616 char *normalized_url;
617 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
618
619 config.section = "http";
620 config.key = NULL;
621 config.collect_fn = http_options;
622 config.cascade_fn = git_default_config;
623 config.cb = NULL;
624
625 http_is_verbose = 0;
626 normalized_url = url_normalize(url, &config.url);
627
628 git_config(urlmatch_config_entry, &config);
629 free(normalized_url);
630
631 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
632 die("curl_global_init failed");
633
634 http_proactive_auth = proactive_auth;
635
636 if (remote && remote->http_proxy)
637 curl_http_proxy = xstrdup(remote->http_proxy);
638
639 if (remote)
640 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
641
642 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
643 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
644
645 #ifdef USE_CURL_MULTI
646 {
647 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
648 if (http_max_requests != NULL)
649 max_requests = atoi(http_max_requests);
650 }
651
652 curlm = curl_multi_init();
653 if (!curlm)
654 die("curl_multi_init failed");
655 #endif
656
657 if (getenv("GIT_SSL_NO_VERIFY"))
658 curl_ssl_verify = 0;
659
660 set_from_env(&ssl_cert, "GIT_SSL_CERT");
661 #if LIBCURL_VERSION_NUM >= 0x070903
662 set_from_env(&ssl_key, "GIT_SSL_KEY");
663 #endif
664 #if LIBCURL_VERSION_NUM >= 0x070908
665 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
666 #endif
667 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
668
669 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
670
671 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
672 if (low_speed_limit != NULL)
673 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
674 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
675 if (low_speed_time != NULL)
676 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
677
678 if (curl_ssl_verify == -1)
679 curl_ssl_verify = 1;
680
681 curl_session_count = 0;
682 #ifdef USE_CURL_MULTI
683 if (max_requests < 1)
684 max_requests = DEFAULT_MAX_REQUESTS;
685 #endif
686
687 if (getenv("GIT_CURL_FTP_NO_EPSV"))
688 curl_ftp_no_epsv = 1;
689
690 if (url) {
691 credential_from_url(&http_auth, url);
692 if (!ssl_cert_password_required &&
693 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
694 starts_with(url, "https://"))
695 ssl_cert_password_required = 1;
696 }
697
698 #ifndef NO_CURL_EASY_DUPHANDLE
699 curl_default = get_curl_handle();
700 #endif
701 }
702
703 void http_cleanup(void)
704 {
705 struct active_request_slot *slot = active_queue_head;
706
707 while (slot != NULL) {
708 struct active_request_slot *next = slot->next;
709 if (slot->curl != NULL) {
710 #ifdef USE_CURL_MULTI
711 curl_multi_remove_handle(curlm, slot->curl);
712 #endif
713 curl_easy_cleanup(slot->curl);
714 }
715 free(slot);
716 slot = next;
717 }
718 active_queue_head = NULL;
719
720 #ifndef NO_CURL_EASY_DUPHANDLE
721 curl_easy_cleanup(curl_default);
722 #endif
723
724 #ifdef USE_CURL_MULTI
725 curl_multi_cleanup(curlm);
726 #endif
727 curl_global_cleanup();
728
729 curl_slist_free_all(pragma_header);
730 pragma_header = NULL;
731
732 curl_slist_free_all(no_pragma_header);
733 no_pragma_header = NULL;
734
735 if (curl_http_proxy) {
736 free((void *)curl_http_proxy);
737 curl_http_proxy = NULL;
738 }
739
740 if (proxy_auth.password) {
741 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
742 free(proxy_auth.password);
743 proxy_auth.password = NULL;
744 }
745
746 free((void *)curl_proxyuserpwd);
747 curl_proxyuserpwd = NULL;
748
749 free((void *)http_proxy_authmethod);
750 http_proxy_authmethod = NULL;
751
752 if (cert_auth.password != NULL) {
753 memset(cert_auth.password, 0, strlen(cert_auth.password));
754 free(cert_auth.password);
755 cert_auth.password = NULL;
756 }
757 ssl_cert_password_required = 0;
758
759 free(cached_accept_language);
760 cached_accept_language = NULL;
761 }
762
763 struct active_request_slot *get_active_slot(void)
764 {
765 struct active_request_slot *slot = active_queue_head;
766 struct active_request_slot *newslot;
767
768 #ifdef USE_CURL_MULTI
769 int num_transfers;
770
771 /* Wait for a slot to open up if the queue is full */
772 while (active_requests >= max_requests) {
773 curl_multi_perform(curlm, &num_transfers);
774 if (num_transfers < active_requests)
775 process_curl_messages();
776 }
777 #endif
778
779 while (slot != NULL && slot->in_use)
780 slot = slot->next;
781
782 if (slot == NULL) {
783 newslot = xmalloc(sizeof(*newslot));
784 newslot->curl = NULL;
785 newslot->in_use = 0;
786 newslot->next = NULL;
787
788 slot = active_queue_head;
789 if (slot == NULL) {
790 active_queue_head = newslot;
791 } else {
792 while (slot->next != NULL)
793 slot = slot->next;
794 slot->next = newslot;
795 }
796 slot = newslot;
797 }
798
799 if (slot->curl == NULL) {
800 #ifdef NO_CURL_EASY_DUPHANDLE
801 slot->curl = get_curl_handle();
802 #else
803 slot->curl = curl_easy_duphandle(curl_default);
804 #endif
805 curl_session_count++;
806 }
807
808 active_requests++;
809 slot->in_use = 1;
810 slot->results = NULL;
811 slot->finished = NULL;
812 slot->callback_data = NULL;
813 slot->callback_func = NULL;
814 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
815 if (curl_save_cookies)
816 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
817 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
818 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
819 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
820 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
821 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
822 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
823 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
824 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
825 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
826 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
827 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
828 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
829 #endif
830 if (http_auth.password)
831 init_curl_http_auth(slot->curl);
832
833 return slot;
834 }
835
836 int start_active_slot(struct active_request_slot *slot)
837 {
838 #ifdef USE_CURL_MULTI
839 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
840 int num_transfers;
841
842 if (curlm_result != CURLM_OK &&
843 curlm_result != CURLM_CALL_MULTI_PERFORM) {
844 active_requests--;
845 slot->in_use = 0;
846 return 0;
847 }
848
849 /*
850 * We know there must be something to do, since we just added
851 * something.
852 */
853 curl_multi_perform(curlm, &num_transfers);
854 #endif
855 return 1;
856 }
857
858 #ifdef USE_CURL_MULTI
859 struct fill_chain {
860 void *data;
861 int (*fill)(void *);
862 struct fill_chain *next;
863 };
864
865 static struct fill_chain *fill_cfg;
866
867 void add_fill_function(void *data, int (*fill)(void *))
868 {
869 struct fill_chain *new = xmalloc(sizeof(*new));
870 struct fill_chain **linkp = &fill_cfg;
871 new->data = data;
872 new->fill = fill;
873 new->next = NULL;
874 while (*linkp)
875 linkp = &(*linkp)->next;
876 *linkp = new;
877 }
878
879 void fill_active_slots(void)
880 {
881 struct active_request_slot *slot = active_queue_head;
882
883 while (active_requests < max_requests) {
884 struct fill_chain *fill;
885 for (fill = fill_cfg; fill; fill = fill->next)
886 if (fill->fill(fill->data))
887 break;
888
889 if (!fill)
890 break;
891 }
892
893 while (slot != NULL) {
894 if (!slot->in_use && slot->curl != NULL
895 && curl_session_count > min_curl_sessions) {
896 curl_easy_cleanup(slot->curl);
897 slot->curl = NULL;
898 curl_session_count--;
899 }
900 slot = slot->next;
901 }
902 }
903
904 void step_active_slots(void)
905 {
906 int num_transfers;
907 CURLMcode curlm_result;
908
909 do {
910 curlm_result = curl_multi_perform(curlm, &num_transfers);
911 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
912 if (num_transfers < active_requests) {
913 process_curl_messages();
914 fill_active_slots();
915 }
916 }
917 #endif
918
919 void run_active_slot(struct active_request_slot *slot)
920 {
921 #ifdef USE_CURL_MULTI
922 fd_set readfds;
923 fd_set writefds;
924 fd_set excfds;
925 int max_fd;
926 struct timeval select_timeout;
927 int finished = 0;
928
929 slot->finished = &finished;
930 while (!finished) {
931 step_active_slots();
932
933 if (slot->in_use) {
934 #if LIBCURL_VERSION_NUM >= 0x070f04
935 long curl_timeout;
936 curl_multi_timeout(curlm, &curl_timeout);
937 if (curl_timeout == 0) {
938 continue;
939 } else if (curl_timeout == -1) {
940 select_timeout.tv_sec = 0;
941 select_timeout.tv_usec = 50000;
942 } else {
943 select_timeout.tv_sec = curl_timeout / 1000;
944 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
945 }
946 #else
947 select_timeout.tv_sec = 0;
948 select_timeout.tv_usec = 50000;
949 #endif
950
951 max_fd = -1;
952 FD_ZERO(&readfds);
953 FD_ZERO(&writefds);
954 FD_ZERO(&excfds);
955 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
956
957 /*
958 * It can happen that curl_multi_timeout returns a pathologically
959 * long timeout when curl_multi_fdset returns no file descriptors
960 * to read. See commit message for more details.
961 */
962 if (max_fd < 0 &&
963 (select_timeout.tv_sec > 0 ||
964 select_timeout.tv_usec > 50000)) {
965 select_timeout.tv_sec = 0;
966 select_timeout.tv_usec = 50000;
967 }
968
969 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
970 }
971 }
972 #else
973 while (slot->in_use) {
974 slot->curl_result = curl_easy_perform(slot->curl);
975 finish_active_slot(slot);
976 }
977 #endif
978 }
979
980 static void release_active_slot(struct active_request_slot *slot)
981 {
982 closedown_active_slot(slot);
983 if (slot->curl && curl_session_count > min_curl_sessions) {
984 #ifdef USE_CURL_MULTI
985 curl_multi_remove_handle(curlm, slot->curl);
986 #endif
987 curl_easy_cleanup(slot->curl);
988 slot->curl = NULL;
989 curl_session_count--;
990 }
991 #ifdef USE_CURL_MULTI
992 fill_active_slots();
993 #endif
994 }
995
996 void finish_all_active_slots(void)
997 {
998 struct active_request_slot *slot = active_queue_head;
999
1000 while (slot != NULL)
1001 if (slot->in_use) {
1002 run_active_slot(slot);
1003 slot = active_queue_head;
1004 } else {
1005 slot = slot->next;
1006 }
1007 }
1008
1009 /* Helpers for modifying and creating URLs */
1010 static inline int needs_quote(int ch)
1011 {
1012 if (((ch >= 'A') && (ch <= 'Z'))
1013 || ((ch >= 'a') && (ch <= 'z'))
1014 || ((ch >= '0') && (ch <= '9'))
1015 || (ch == '/')
1016 || (ch == '-')
1017 || (ch == '.'))
1018 return 0;
1019 return 1;
1020 }
1021
1022 static char *quote_ref_url(const char *base, const char *ref)
1023 {
1024 struct strbuf buf = STRBUF_INIT;
1025 const char *cp;
1026 int ch;
1027
1028 end_url_with_slash(&buf, base);
1029
1030 for (cp = ref; (ch = *cp) != 0; cp++)
1031 if (needs_quote(ch))
1032 strbuf_addf(&buf, "%%%02x", ch);
1033 else
1034 strbuf_addch(&buf, *cp);
1035
1036 return strbuf_detach(&buf, NULL);
1037 }
1038
1039 void append_remote_object_url(struct strbuf *buf, const char *url,
1040 const char *hex,
1041 int only_two_digit_prefix)
1042 {
1043 end_url_with_slash(buf, url);
1044
1045 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1046 if (!only_two_digit_prefix)
1047 strbuf_addf(buf, "%s", hex+2);
1048 }
1049
1050 char *get_remote_object_url(const char *url, const char *hex,
1051 int only_two_digit_prefix)
1052 {
1053 struct strbuf buf = STRBUF_INIT;
1054 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1055 return strbuf_detach(&buf, NULL);
1056 }
1057
1058 static int handle_curl_result(struct slot_results *results)
1059 {
1060 /*
1061 * If we see a failing http code with CURLE_OK, we have turned off
1062 * FAILONERROR (to keep the server's custom error response), and should
1063 * translate the code into failure here.
1064 */
1065 if (results->curl_result == CURLE_OK &&
1066 results->http_code >= 400) {
1067 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1068 /*
1069 * Normally curl will already have put the "reason phrase"
1070 * from the server into curl_errorstr; unfortunately without
1071 * FAILONERROR it is lost, so we can give only the numeric
1072 * status code.
1073 */
1074 snprintf(curl_errorstr, sizeof(curl_errorstr),
1075 "The requested URL returned error: %ld",
1076 results->http_code);
1077 }
1078
1079 if (results->curl_result == CURLE_OK) {
1080 credential_approve(&http_auth);
1081 if (proxy_auth.password)
1082 credential_approve(&proxy_auth);
1083 return HTTP_OK;
1084 } else if (missing_target(results))
1085 return HTTP_MISSING_TARGET;
1086 else if (results->http_code == 401) {
1087 if (http_auth.username && http_auth.password) {
1088 credential_reject(&http_auth);
1089 return HTTP_NOAUTH;
1090 } else {
1091 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1092 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1093 #endif
1094 return HTTP_REAUTH;
1095 }
1096 } else {
1097 if (results->http_connectcode == 407)
1098 credential_reject(&proxy_auth);
1099 #if LIBCURL_VERSION_NUM >= 0x070c00
1100 if (!curl_errorstr[0])
1101 strlcpy(curl_errorstr,
1102 curl_easy_strerror(results->curl_result),
1103 sizeof(curl_errorstr));
1104 #endif
1105 return HTTP_ERROR;
1106 }
1107 }
1108
1109 int run_one_slot(struct active_request_slot *slot,
1110 struct slot_results *results)
1111 {
1112 slot->results = results;
1113 if (!start_active_slot(slot)) {
1114 snprintf(curl_errorstr, sizeof(curl_errorstr),
1115 "failed to start HTTP request");
1116 return HTTP_START_FAILED;
1117 }
1118
1119 run_active_slot(slot);
1120 return handle_curl_result(results);
1121 }
1122
1123 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1124 {
1125 char *ptr;
1126 CURLcode ret;
1127
1128 strbuf_reset(buf);
1129 ret = curl_easy_getinfo(curl, info, &ptr);
1130 if (!ret && ptr)
1131 strbuf_addstr(buf, ptr);
1132 return ret;
1133 }
1134
1135 /*
1136 * Check for and extract a content-type parameter. "raw"
1137 * should be positioned at the start of the potential
1138 * parameter, with any whitespace already removed.
1139 *
1140 * "name" is the name of the parameter. The value is appended
1141 * to "out".
1142 */
1143 static int extract_param(const char *raw, const char *name,
1144 struct strbuf *out)
1145 {
1146 size_t len = strlen(name);
1147
1148 if (strncasecmp(raw, name, len))
1149 return -1;
1150 raw += len;
1151
1152 if (*raw != '=')
1153 return -1;
1154 raw++;
1155
1156 while (*raw && !isspace(*raw) && *raw != ';')
1157 strbuf_addch(out, *raw++);
1158 return 0;
1159 }
1160
1161 /*
1162 * Extract a normalized version of the content type, with any
1163 * spaces suppressed, all letters lowercased, and no trailing ";"
1164 * or parameters.
1165 *
1166 * Note that we will silently remove even invalid whitespace. For
1167 * example, "text / plain" is specifically forbidden by RFC 2616,
1168 * but "text/plain" is the only reasonable output, and this keeps
1169 * our code simple.
1170 *
1171 * If the "charset" argument is not NULL, store the value of any
1172 * charset parameter there.
1173 *
1174 * Example:
1175 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1176 * "text / plain" -> "text/plain"
1177 */
1178 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1179 struct strbuf *charset)
1180 {
1181 const char *p;
1182
1183 strbuf_reset(type);
1184 strbuf_grow(type, raw->len);
1185 for (p = raw->buf; *p; p++) {
1186 if (isspace(*p))
1187 continue;
1188 if (*p == ';') {
1189 p++;
1190 break;
1191 }
1192 strbuf_addch(type, tolower(*p));
1193 }
1194
1195 if (!charset)
1196 return;
1197
1198 strbuf_reset(charset);
1199 while (*p) {
1200 while (isspace(*p) || *p == ';')
1201 p++;
1202 if (!extract_param(p, "charset", charset))
1203 return;
1204 while (*p && !isspace(*p))
1205 p++;
1206 }
1207
1208 if (!charset->len && starts_with(type->buf, "text/"))
1209 strbuf_addstr(charset, "ISO-8859-1");
1210 }
1211
1212 static void write_accept_language(struct strbuf *buf)
1213 {
1214 /*
1215 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1216 * that, q-value will be smaller than 0.001, the minimum q-value the
1217 * HTTP specification allows. See
1218 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1219 */
1220 const int MAX_DECIMAL_PLACES = 3;
1221 const int MAX_LANGUAGE_TAGS = 1000;
1222 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1223 char **language_tags = NULL;
1224 int num_langs = 0;
1225 const char *s = get_preferred_languages();
1226 int i;
1227 struct strbuf tag = STRBUF_INIT;
1228
1229 /* Don't add Accept-Language header if no language is preferred. */
1230 if (!s)
1231 return;
1232
1233 /*
1234 * Split the colon-separated string of preferred languages into
1235 * language_tags array.
1236 */
1237 do {
1238 /* collect language tag */
1239 for (; *s && (isalnum(*s) || *s == '_'); s++)
1240 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1241
1242 /* skip .codeset, @modifier and any other unnecessary parts */
1243 while (*s && *s != ':')
1244 s++;
1245
1246 if (tag.len) {
1247 num_langs++;
1248 REALLOC_ARRAY(language_tags, num_langs);
1249 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1250 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1251 break;
1252 }
1253 } while (*s++);
1254
1255 /* write Accept-Language header into buf */
1256 if (num_langs) {
1257 int last_buf_len = 0;
1258 int max_q;
1259 int decimal_places;
1260 char q_format[32];
1261
1262 /* add '*' */
1263 REALLOC_ARRAY(language_tags, num_langs + 1);
1264 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1265
1266 /* compute decimal_places */
1267 for (max_q = 1, decimal_places = 0;
1268 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1269 decimal_places++, max_q *= 10)
1270 ;
1271
1272 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1273
1274 strbuf_addstr(buf, "Accept-Language: ");
1275
1276 for (i = 0; i < num_langs; i++) {
1277 if (i > 0)
1278 strbuf_addstr(buf, ", ");
1279
1280 strbuf_addstr(buf, language_tags[i]);
1281
1282 if (i > 0)
1283 strbuf_addf(buf, q_format, max_q - i);
1284
1285 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1286 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1287 break;
1288 }
1289
1290 last_buf_len = buf->len;
1291 }
1292 }
1293
1294 /* free language tags -- last one is a static '*' */
1295 for (i = 0; i < num_langs - 1; i++)
1296 free(language_tags[i]);
1297 free(language_tags);
1298 }
1299
1300 /*
1301 * Get an Accept-Language header which indicates user's preferred languages.
1302 *
1303 * Examples:
1304 * LANGUAGE= -> ""
1305 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1306 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1307 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1308 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1309 * LANGUAGE= LANG=C -> ""
1310 */
1311 static const char *get_accept_language(void)
1312 {
1313 if (!cached_accept_language) {
1314 struct strbuf buf = STRBUF_INIT;
1315 write_accept_language(&buf);
1316 if (buf.len > 0)
1317 cached_accept_language = strbuf_detach(&buf, NULL);
1318 }
1319
1320 return cached_accept_language;
1321 }
1322
1323 static void http_opt_request_remainder(CURL *curl, off_t pos)
1324 {
1325 char buf[128];
1326 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1327 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1328 }
1329
1330 /* http_request() targets */
1331 #define HTTP_REQUEST_STRBUF 0
1332 #define HTTP_REQUEST_FILE 1
1333
1334 static int http_request(const char *url,
1335 void *result, int target,
1336 const struct http_get_options *options)
1337 {
1338 struct active_request_slot *slot;
1339 struct slot_results results;
1340 struct curl_slist *headers = NULL;
1341 struct strbuf buf = STRBUF_INIT;
1342 const char *accept_language;
1343 int ret;
1344
1345 slot = get_active_slot();
1346 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1347
1348 if (result == NULL) {
1349 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1350 } else {
1351 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1352 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1353
1354 if (target == HTTP_REQUEST_FILE) {
1355 off_t posn = ftello(result);
1356 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1357 fwrite);
1358 if (posn > 0)
1359 http_opt_request_remainder(slot->curl, posn);
1360 } else
1361 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1362 fwrite_buffer);
1363 }
1364
1365 accept_language = get_accept_language();
1366
1367 if (accept_language)
1368 headers = curl_slist_append(headers, accept_language);
1369
1370 strbuf_addstr(&buf, "Pragma:");
1371 if (options && options->no_cache)
1372 strbuf_addstr(&buf, " no-cache");
1373 if (options && options->keep_error)
1374 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1375
1376 headers = curl_slist_append(headers, buf.buf);
1377
1378 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1379 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1380 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1381
1382 ret = run_one_slot(slot, &results);
1383
1384 if (options && options->content_type) {
1385 struct strbuf raw = STRBUF_INIT;
1386 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1387 extract_content_type(&raw, options->content_type,
1388 options->charset);
1389 strbuf_release(&raw);
1390 }
1391
1392 if (options && options->effective_url)
1393 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1394 options->effective_url);
1395
1396 curl_slist_free_all(headers);
1397 strbuf_release(&buf);
1398
1399 return ret;
1400 }
1401
1402 /*
1403 * Update the "base" url to a more appropriate value, as deduced by
1404 * redirects seen when requesting a URL starting with "url".
1405 *
1406 * The "asked" parameter is a URL that we asked curl to access, and must begin
1407 * with "base".
1408 *
1409 * The "got" parameter is the URL that curl reported to us as where we ended
1410 * up.
1411 *
1412 * Returns 1 if we updated the base url, 0 otherwise.
1413 *
1414 * Our basic strategy is to compare "base" and "asked" to find the bits
1415 * specific to our request. We then strip those bits off of "got" to yield the
1416 * new base. So for example, if our base is "http://example.com/foo.git",
1417 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1418 * with "https://other.example.com/foo.git/info/refs". We would want the
1419 * new URL to become "https://other.example.com/foo.git".
1420 *
1421 * Note that this assumes a sane redirect scheme. It's entirely possible
1422 * in the example above to end up at a URL that does not even end in
1423 * "info/refs". In such a case we simply punt, as there is not much we can
1424 * do (and such a scheme is unlikely to represent a real git repository,
1425 * which means we are likely about to abort anyway).
1426 */
1427 static int update_url_from_redirect(struct strbuf *base,
1428 const char *asked,
1429 const struct strbuf *got)
1430 {
1431 const char *tail;
1432 size_t tail_len;
1433
1434 if (!strcmp(asked, got->buf))
1435 return 0;
1436
1437 if (!skip_prefix(asked, base->buf, &tail))
1438 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1439 asked, base->buf);
1440
1441 tail_len = strlen(tail);
1442
1443 if (got->len < tail_len ||
1444 strcmp(tail, got->buf + got->len - tail_len))
1445 return 0; /* insane redirect scheme */
1446
1447 strbuf_reset(base);
1448 strbuf_add(base, got->buf, got->len - tail_len);
1449 return 1;
1450 }
1451
1452 static int http_request_reauth(const char *url,
1453 void *result, int target,
1454 struct http_get_options *options)
1455 {
1456 int ret = http_request(url, result, target, options);
1457
1458 if (options && options->effective_url && options->base_url) {
1459 if (update_url_from_redirect(options->base_url,
1460 url, options->effective_url)) {
1461 credential_from_url(&http_auth, options->base_url->buf);
1462 url = options->effective_url->buf;
1463 }
1464 }
1465
1466 if (ret != HTTP_REAUTH)
1467 return ret;
1468
1469 /*
1470 * If we are using KEEP_ERROR, the previous request may have
1471 * put cruft into our output stream; we should clear it out before
1472 * making our next request. We only know how to do this for
1473 * the strbuf case, but that is enough to satisfy current callers.
1474 */
1475 if (options && options->keep_error) {
1476 switch (target) {
1477 case HTTP_REQUEST_STRBUF:
1478 strbuf_reset(result);
1479 break;
1480 default:
1481 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1482 }
1483 }
1484
1485 credential_fill(&http_auth);
1486
1487 return http_request(url, result, target, options);
1488 }
1489
1490 int http_get_strbuf(const char *url,
1491 struct strbuf *result,
1492 struct http_get_options *options)
1493 {
1494 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1495 }
1496
1497 /*
1498 * Downloads a URL and stores the result in the given file.
1499 *
1500 * If a previous interrupted download is detected (i.e. a previous temporary
1501 * file is still around) the download is resumed.
1502 */
1503 static int http_get_file(const char *url, const char *filename,
1504 struct http_get_options *options)
1505 {
1506 int ret;
1507 struct strbuf tmpfile = STRBUF_INIT;
1508 FILE *result;
1509
1510 strbuf_addf(&tmpfile, "%s.temp", filename);
1511 result = fopen(tmpfile.buf, "a");
1512 if (!result) {
1513 error("Unable to open local file %s", tmpfile.buf);
1514 ret = HTTP_ERROR;
1515 goto cleanup;
1516 }
1517
1518 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1519 fclose(result);
1520
1521 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1522 ret = HTTP_ERROR;
1523 cleanup:
1524 strbuf_release(&tmpfile);
1525 return ret;
1526 }
1527
1528 int http_fetch_ref(const char *base, struct ref *ref)
1529 {
1530 struct http_get_options options = {0};
1531 char *url;
1532 struct strbuf buffer = STRBUF_INIT;
1533 int ret = -1;
1534
1535 options.no_cache = 1;
1536
1537 url = quote_ref_url(base, ref->name);
1538 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1539 strbuf_rtrim(&buffer);
1540 if (buffer.len == 40)
1541 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1542 else if (starts_with(buffer.buf, "ref: ")) {
1543 ref->symref = xstrdup(buffer.buf + 5);
1544 ret = 0;
1545 }
1546 }
1547
1548 strbuf_release(&buffer);
1549 free(url);
1550 return ret;
1551 }
1552
1553 /* Helpers for fetching packs */
1554 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1555 {
1556 char *url, *tmp;
1557 struct strbuf buf = STRBUF_INIT;
1558
1559 if (http_is_verbose)
1560 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1561
1562 end_url_with_slash(&buf, base_url);
1563 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1564 url = strbuf_detach(&buf, NULL);
1565
1566 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1567 tmp = strbuf_detach(&buf, NULL);
1568
1569 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1570 error("Unable to get pack index %s", url);
1571 free(tmp);
1572 tmp = NULL;
1573 }
1574
1575 free(url);
1576 return tmp;
1577 }
1578
1579 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1580 unsigned char *sha1, const char *base_url)
1581 {
1582 struct packed_git *new_pack;
1583 char *tmp_idx = NULL;
1584 int ret;
1585
1586 if (has_pack_index(sha1)) {
1587 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1588 if (!new_pack)
1589 return -1; /* parse_pack_index() already issued error message */
1590 goto add_pack;
1591 }
1592
1593 tmp_idx = fetch_pack_index(sha1, base_url);
1594 if (!tmp_idx)
1595 return -1;
1596
1597 new_pack = parse_pack_index(sha1, tmp_idx);
1598 if (!new_pack) {
1599 unlink(tmp_idx);
1600 free(tmp_idx);
1601
1602 return -1; /* parse_pack_index() already issued error message */
1603 }
1604
1605 ret = verify_pack_index(new_pack);
1606 if (!ret) {
1607 close_pack_index(new_pack);
1608 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1609 }
1610 free(tmp_idx);
1611 if (ret)
1612 return -1;
1613
1614 add_pack:
1615 new_pack->next = *packs_head;
1616 *packs_head = new_pack;
1617 return 0;
1618 }
1619
1620 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1621 {
1622 struct http_get_options options = {0};
1623 int ret = 0, i = 0;
1624 char *url, *data;
1625 struct strbuf buf = STRBUF_INIT;
1626 unsigned char sha1[20];
1627
1628 end_url_with_slash(&buf, base_url);
1629 strbuf_addstr(&buf, "objects/info/packs");
1630 url = strbuf_detach(&buf, NULL);
1631
1632 options.no_cache = 1;
1633 ret = http_get_strbuf(url, &buf, &options);
1634 if (ret != HTTP_OK)
1635 goto cleanup;
1636
1637 data = buf.buf;
1638 while (i < buf.len) {
1639 switch (data[i]) {
1640 case 'P':
1641 i++;
1642 if (i + 52 <= buf.len &&
1643 starts_with(data + i, " pack-") &&
1644 starts_with(data + i + 46, ".pack\n")) {
1645 get_sha1_hex(data + i + 6, sha1);
1646 fetch_and_setup_pack_index(packs_head, sha1,
1647 base_url);
1648 i += 51;
1649 break;
1650 }
1651 default:
1652 while (i < buf.len && data[i] != '\n')
1653 i++;
1654 }
1655 i++;
1656 }
1657
1658 cleanup:
1659 free(url);
1660 return ret;
1661 }
1662
1663 void release_http_pack_request(struct http_pack_request *preq)
1664 {
1665 if (preq->packfile != NULL) {
1666 fclose(preq->packfile);
1667 preq->packfile = NULL;
1668 }
1669 preq->slot = NULL;
1670 free(preq->url);
1671 free(preq);
1672 }
1673
1674 int finish_http_pack_request(struct http_pack_request *preq)
1675 {
1676 struct packed_git **lst;
1677 struct packed_git *p = preq->target;
1678 char *tmp_idx;
1679 size_t len;
1680 struct child_process ip = CHILD_PROCESS_INIT;
1681 const char *ip_argv[8];
1682
1683 close_pack_index(p);
1684
1685 fclose(preq->packfile);
1686 preq->packfile = NULL;
1687
1688 lst = preq->lst;
1689 while (*lst != p)
1690 lst = &((*lst)->next);
1691 *lst = (*lst)->next;
1692
1693 if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1694 die("BUG: pack tmpfile does not end in .pack.temp?");
1695 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1696
1697 ip_argv[0] = "index-pack";
1698 ip_argv[1] = "-o";
1699 ip_argv[2] = tmp_idx;
1700 ip_argv[3] = preq->tmpfile;
1701 ip_argv[4] = NULL;
1702
1703 ip.argv = ip_argv;
1704 ip.git_cmd = 1;
1705 ip.no_stdin = 1;
1706 ip.no_stdout = 1;
1707
1708 if (run_command(&ip)) {
1709 unlink(preq->tmpfile);
1710 unlink(tmp_idx);
1711 free(tmp_idx);
1712 return -1;
1713 }
1714
1715 unlink(sha1_pack_index_name(p->sha1));
1716
1717 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1718 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1719 free(tmp_idx);
1720 return -1;
1721 }
1722
1723 install_packed_git(p);
1724 free(tmp_idx);
1725 return 0;
1726 }
1727
1728 struct http_pack_request *new_http_pack_request(
1729 struct packed_git *target, const char *base_url)
1730 {
1731 off_t prev_posn = 0;
1732 struct strbuf buf = STRBUF_INIT;
1733 struct http_pack_request *preq;
1734
1735 preq = xcalloc(1, sizeof(*preq));
1736 preq->target = target;
1737
1738 end_url_with_slash(&buf, base_url);
1739 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1740 sha1_to_hex(target->sha1));
1741 preq->url = strbuf_detach(&buf, NULL);
1742
1743 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1744 sha1_pack_name(target->sha1));
1745 preq->packfile = fopen(preq->tmpfile, "a");
1746 if (!preq->packfile) {
1747 error("Unable to open local file %s for pack",
1748 preq->tmpfile);
1749 goto abort;
1750 }
1751
1752 preq->slot = get_active_slot();
1753 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1754 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1755 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1756 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1757 no_pragma_header);
1758
1759 /*
1760 * If there is data present from a previous transfer attempt,
1761 * resume where it left off
1762 */
1763 prev_posn = ftello(preq->packfile);
1764 if (prev_posn>0) {
1765 if (http_is_verbose)
1766 fprintf(stderr,
1767 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
1768 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
1769 http_opt_request_remainder(preq->slot->curl, prev_posn);
1770 }
1771
1772 return preq;
1773
1774 abort:
1775 free(preq->url);
1776 free(preq);
1777 return NULL;
1778 }
1779
1780 /* Helpers for fetching objects (loose) */
1781 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1782 void *data)
1783 {
1784 unsigned char expn[4096];
1785 size_t size = eltsize * nmemb;
1786 int posn = 0;
1787 struct http_object_request *freq =
1788 (struct http_object_request *)data;
1789 do {
1790 ssize_t retval = xwrite(freq->localfile,
1791 (char *) ptr + posn, size - posn);
1792 if (retval < 0)
1793 return posn;
1794 posn += retval;
1795 } while (posn < size);
1796
1797 freq->stream.avail_in = size;
1798 freq->stream.next_in = (void *)ptr;
1799 do {
1800 freq->stream.next_out = expn;
1801 freq->stream.avail_out = sizeof(expn);
1802 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1803 git_SHA1_Update(&freq->c, expn,
1804 sizeof(expn) - freq->stream.avail_out);
1805 } while (freq->stream.avail_in && freq->zret == Z_OK);
1806 return size;
1807 }
1808
1809 struct http_object_request *new_http_object_request(const char *base_url,
1810 unsigned char *sha1)
1811 {
1812 char *hex = sha1_to_hex(sha1);
1813 const char *filename;
1814 char prevfile[PATH_MAX];
1815 int prevlocal;
1816 char prev_buf[PREV_BUF_SIZE];
1817 ssize_t prev_read = 0;
1818 off_t prev_posn = 0;
1819 struct http_object_request *freq;
1820
1821 freq = xcalloc(1, sizeof(*freq));
1822 hashcpy(freq->sha1, sha1);
1823 freq->localfile = -1;
1824
1825 filename = sha1_file_name(sha1);
1826 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1827 "%s.temp", filename);
1828
1829 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1830 unlink_or_warn(prevfile);
1831 rename(freq->tmpfile, prevfile);
1832 unlink_or_warn(freq->tmpfile);
1833
1834 if (freq->localfile != -1)
1835 error("fd leakage in start: %d", freq->localfile);
1836 freq->localfile = open(freq->tmpfile,
1837 O_WRONLY | O_CREAT | O_EXCL, 0666);
1838 /*
1839 * This could have failed due to the "lazy directory creation";
1840 * try to mkdir the last path component.
1841 */
1842 if (freq->localfile < 0 && errno == ENOENT) {
1843 char *dir = strrchr(freq->tmpfile, '/');
1844 if (dir) {
1845 *dir = 0;
1846 mkdir(freq->tmpfile, 0777);
1847 *dir = '/';
1848 }
1849 freq->localfile = open(freq->tmpfile,
1850 O_WRONLY | O_CREAT | O_EXCL, 0666);
1851 }
1852
1853 if (freq->localfile < 0) {
1854 error("Couldn't create temporary file %s: %s",
1855 freq->tmpfile, strerror(errno));
1856 goto abort;
1857 }
1858
1859 git_inflate_init(&freq->stream);
1860
1861 git_SHA1_Init(&freq->c);
1862
1863 freq->url = get_remote_object_url(base_url, hex, 0);
1864
1865 /*
1866 * If a previous temp file is present, process what was already
1867 * fetched.
1868 */
1869 prevlocal = open(prevfile, O_RDONLY);
1870 if (prevlocal != -1) {
1871 do {
1872 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1873 if (prev_read>0) {
1874 if (fwrite_sha1_file(prev_buf,
1875 1,
1876 prev_read,
1877 freq) == prev_read) {
1878 prev_posn += prev_read;
1879 } else {
1880 prev_read = -1;
1881 }
1882 }
1883 } while (prev_read > 0);
1884 close(prevlocal);
1885 }
1886 unlink_or_warn(prevfile);
1887
1888 /*
1889 * Reset inflate/SHA1 if there was an error reading the previous temp
1890 * file; also rewind to the beginning of the local file.
1891 */
1892 if (prev_read == -1) {
1893 memset(&freq->stream, 0, sizeof(freq->stream));
1894 git_inflate_init(&freq->stream);
1895 git_SHA1_Init(&freq->c);
1896 if (prev_posn>0) {
1897 prev_posn = 0;
1898 lseek(freq->localfile, 0, SEEK_SET);
1899 if (ftruncate(freq->localfile, 0) < 0) {
1900 error("Couldn't truncate temporary file %s: %s",
1901 freq->tmpfile, strerror(errno));
1902 goto abort;
1903 }
1904 }
1905 }
1906
1907 freq->slot = get_active_slot();
1908
1909 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1910 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1911 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1912 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1913 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1914
1915 /*
1916 * If we have successfully processed data from a previous fetch
1917 * attempt, only fetch the data we don't already have.
1918 */
1919 if (prev_posn>0) {
1920 if (http_is_verbose)
1921 fprintf(stderr,
1922 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
1923 hex, (uintmax_t)prev_posn);
1924 http_opt_request_remainder(freq->slot->curl, prev_posn);
1925 }
1926
1927 return freq;
1928
1929 abort:
1930 free(freq->url);
1931 free(freq);
1932 return NULL;
1933 }
1934
1935 void process_http_object_request(struct http_object_request *freq)
1936 {
1937 if (freq->slot == NULL)
1938 return;
1939 freq->curl_result = freq->slot->curl_result;
1940 freq->http_code = freq->slot->http_code;
1941 freq->slot = NULL;
1942 }
1943
1944 int finish_http_object_request(struct http_object_request *freq)
1945 {
1946 struct stat st;
1947
1948 close(freq->localfile);
1949 freq->localfile = -1;
1950
1951 process_http_object_request(freq);
1952
1953 if (freq->http_code == 416) {
1954 warning("requested range invalid; we may already have all the data.");
1955 } else if (freq->curl_result != CURLE_OK) {
1956 if (stat(freq->tmpfile, &st) == 0)
1957 if (st.st_size == 0)
1958 unlink_or_warn(freq->tmpfile);
1959 return -1;
1960 }
1961
1962 git_inflate_end(&freq->stream);
1963 git_SHA1_Final(freq->real_sha1, &freq->c);
1964 if (freq->zret != Z_STREAM_END) {
1965 unlink_or_warn(freq->tmpfile);
1966 return -1;
1967 }
1968 if (hashcmp(freq->sha1, freq->real_sha1)) {
1969 unlink_or_warn(freq->tmpfile);
1970 return -1;
1971 }
1972 freq->rename =
1973 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
1974
1975 return freq->rename;
1976 }
1977
1978 void abort_http_object_request(struct http_object_request *freq)
1979 {
1980 unlink_or_warn(freq->tmpfile);
1981
1982 release_http_object_request(freq);
1983 }
1984
1985 void release_http_object_request(struct http_object_request *freq)
1986 {
1987 if (freq->localfile != -1) {
1988 close(freq->localfile);
1989 freq->localfile = -1;
1990 }
1991 if (freq->url != NULL) {
1992 free(freq->url);
1993 freq->url = NULL;
1994 }
1995 if (freq->slot != NULL) {
1996 freq->slot->callback_func = NULL;
1997 freq->slot->callback_data = NULL;
1998 release_active_slot(freq->slot);
1999 freq->slot = NULL;
2000 }
2001 }
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