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http: prefer CURLOPT_SEEKFUNCTION to CURLOPT_IOCTLFUNCTION
[git/debian.git] / http.c
blobb228137388e66e6b35dfdac35bd6c9dbdd553b3d
1 #include "git-compat-util.h"
2 #include "http.h"
3 #include "config.h"
4 #include "pack.h"
5 #include "sideband.h"
6 #include "run-command.h"
7 #include "url.h"
8 #include "urlmatch.h"
9 #include "credential.h"
10 #include "version.h"
11 #include "pkt-line.h"
12 #include "gettext.h"
13 #include "transport.h"
14 #include "packfile.h"
15 #include "protocol.h"
16 #include "string-list.h"
17 #include "object-store.h"
18
19 static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
20 static int trace_curl_data = 1;
21 static int trace_curl_redact = 1;
22 #if LIBCURL_VERSION_NUM >= 0x070a08
23 long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
24 #else
25 long int git_curl_ipresolve;
26 #endif
27 int active_requests;
28 int http_is_verbose;
29 ssize_t http_post_buffer = 16 * LARGE_PACKET_MAX;
30
31 #if LIBCURL_VERSION_NUM >= 0x070a06
32 #define LIBCURL_CAN_HANDLE_AUTH_ANY
33 #endif
34
35 static int min_curl_sessions = 1;
36 static int curl_session_count;
37 #ifdef USE_CURL_MULTI
38 static int max_requests = -1;
39 static CURLM *curlm;
40 #endif
41 #ifndef NO_CURL_EASY_DUPHANDLE
42 static CURL *curl_default;
43 #endif
44
45 #define PREV_BUF_SIZE 4096
46
47 char curl_errorstr[CURL_ERROR_SIZE];
48
49 static int curl_ssl_verify = -1;
50 static int curl_ssl_try;
51 static const char *curl_http_version = NULL;
52 static const char *ssl_cert;
53 static const char *ssl_cipherlist;
54 static const char *ssl_version;
55 static struct {
56 const char *name;
57 long ssl_version;
58 } sslversions[] = {
59 { "sslv2", CURL_SSLVERSION_SSLv2 },
60 { "sslv3", CURL_SSLVERSION_SSLv3 },
61 { "tlsv1", CURL_SSLVERSION_TLSv1 },
62 #if LIBCURL_VERSION_NUM >= 0x072200
63 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
64 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
65 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
66 #endif
67 #if LIBCURL_VERSION_NUM >= 0x073400
68 { "tlsv1.3", CURL_SSLVERSION_TLSv1_3 },
69 #endif
70 };
71 #if LIBCURL_VERSION_NUM >= 0x070903
72 static const char *ssl_key;
73 #endif
74 #if LIBCURL_VERSION_NUM >= 0x070908
75 static const char *ssl_capath;
76 #endif
77 #if LIBCURL_VERSION_NUM >= 0x071304
78 static const char *curl_no_proxy;
79 #endif
80 #if LIBCURL_VERSION_NUM >= 0x072c00
81 static const char *ssl_pinnedkey;
82 #endif
83 static const char *ssl_cainfo;
84 static long curl_low_speed_limit = -1;
85 static long curl_low_speed_time = -1;
86 static int curl_ftp_no_epsv;
87 static const char *curl_http_proxy;
88 static const char *http_proxy_authmethod;
89
90 static const char *http_proxy_ssl_cert;
91 static const char *http_proxy_ssl_key;
92 static const char *http_proxy_ssl_ca_info;
93 static struct credential proxy_cert_auth = CREDENTIAL_INIT;
94 static int proxy_ssl_cert_password_required;
95
96 static struct {
97 const char *name;
98 long curlauth_param;
99 } proxy_authmethods[] = {
100 { "basic", CURLAUTH_BASIC },
101 { "digest", CURLAUTH_DIGEST },
102 { "negotiate", CURLAUTH_GSSNEGOTIATE },
103 { "ntlm", CURLAUTH_NTLM },
104 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
105 { "anyauth", CURLAUTH_ANY },
106 #endif
107 /*
108 * CURLAUTH_DIGEST_IE has no corresponding command-line option in
109 * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
110 * here, too
111 */
112 };
113 #ifdef CURLGSSAPI_DELEGATION_FLAG
114 static const char *curl_deleg;
115 static struct {
116 const char *name;
117 long curl_deleg_param;
118 } curl_deleg_levels[] = {
119 { "none", CURLGSSAPI_DELEGATION_NONE },
120 { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
121 { "always", CURLGSSAPI_DELEGATION_FLAG },
122 };
123 #endif
124
125 static struct credential proxy_auth = CREDENTIAL_INIT;
126 static const char *curl_proxyuserpwd;
127 static const char *curl_cookie_file;
128 static int curl_save_cookies;
129 struct credential http_auth = CREDENTIAL_INIT;
130 static int http_proactive_auth;
131 static const char *user_agent;
132 static int curl_empty_auth = -1;
133
134 enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
135
136 #if LIBCURL_VERSION_NUM >= 0x071700
137 /* Use CURLOPT_KEYPASSWD as is */
138 #elif LIBCURL_VERSION_NUM >= 0x070903
139 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
140 #else
141 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
142 #endif
143
144 static struct credential cert_auth = CREDENTIAL_INIT;
145 static int ssl_cert_password_required;
146 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
147 static unsigned long http_auth_methods = CURLAUTH_ANY;
148 static int http_auth_methods_restricted;
149 /* Modes for which empty_auth cannot actually help us. */
150 static unsigned long empty_auth_useless =
151 CURLAUTH_BASIC
152 #ifdef CURLAUTH_DIGEST_IE
153 | CURLAUTH_DIGEST_IE
154 #endif
155 | CURLAUTH_DIGEST;
156 #endif
157
158 static struct curl_slist *pragma_header;
159 static struct curl_slist *no_pragma_header;
160 static struct string_list extra_http_headers = STRING_LIST_INIT_DUP;
161
162 static struct active_request_slot *active_queue_head;
163
164 static char *cached_accept_language;
165
166 static char *http_ssl_backend;
167
168 static int http_schannel_check_revoke = 1;
169 /*
170 * With the backend being set to `schannel`, setting sslCAinfo would override
171 * the Certificate Store in cURL v7.60.0 and later, which is not what we want
172 * by default.
173 */
174 static int http_schannel_use_ssl_cainfo;
175
176 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
177 {
178 size_t size = eltsize * nmemb;
179 struct buffer *buffer = buffer_;
180
181 if (size > buffer->buf.len - buffer->posn)
182 size = buffer->buf.len - buffer->posn;
183 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
184 buffer->posn += size;
185
186 return size / eltsize;
187 }
188
189 #ifndef NO_CURL_SEEK
190 int seek_buffer(void *clientp, curl_off_t offset, int origin)
191 {
192 struct buffer *buffer = clientp;
193
194 if (origin != SEEK_SET)
195 BUG("seek_buffer only handles SEEK_SET");
196 if (offset < 0 || offset >= buffer->buf.len) {
197 error("curl seek would be outside of buffer");
198 return CURL_SEEKFUNC_FAIL;
199 }
200
201 buffer->posn = offset;
202 return CURL_SEEKFUNC_OK;
203 }
204 #endif
205
206 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
207 {
208 size_t size = eltsize * nmemb;
209 struct strbuf *buffer = buffer_;
210
211 strbuf_add(buffer, ptr, size);
212 return nmemb;
213 }
214
215 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
216 {
217 return nmemb;
218 }
219
220 static void closedown_active_slot(struct active_request_slot *slot)
221 {
222 active_requests--;
223 slot->in_use = 0;
224 }
225
226 static void finish_active_slot(struct active_request_slot *slot)
227 {
228 closedown_active_slot(slot);
229 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
230
231 if (slot->finished != NULL)
232 (*slot->finished) = 1;
233
234 /* Store slot results so they can be read after the slot is reused */
235 if (slot->results != NULL) {
236 slot->results->curl_result = slot->curl_result;
237 slot->results->http_code = slot->http_code;
238 #if LIBCURL_VERSION_NUM >= 0x070a08
239 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
240 &slot->results->auth_avail);
241 #else
242 slot->results->auth_avail = 0;
243 #endif
244
245 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
246 &slot->results->http_connectcode);
247 }
248
249 /* Run callback if appropriate */
250 if (slot->callback_func != NULL)
251 slot->callback_func(slot->callback_data);
252 }
253
254 static void xmulti_remove_handle(struct active_request_slot *slot)
255 {
256 #ifdef USE_CURL_MULTI
257 curl_multi_remove_handle(curlm, slot->curl);
258 #endif
259 }
260
261 #ifdef USE_CURL_MULTI
262 static void process_curl_messages(void)
263 {
264 int num_messages;
265 struct active_request_slot *slot;
266 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
267
268 while (curl_message != NULL) {
269 if (curl_message->msg == CURLMSG_DONE) {
270 int curl_result = curl_message->data.result;
271 slot = active_queue_head;
272 while (slot != NULL &&
273 slot->curl != curl_message->easy_handle)
274 slot = slot->next;
275 if (slot != NULL) {
276 xmulti_remove_handle(slot);
277 slot->curl_result = curl_result;
278 finish_active_slot(slot);
279 } else {
280 fprintf(stderr, "Received DONE message for unknown request!\n");
281 }
282 } else {
283 fprintf(stderr, "Unknown CURL message received: %d\n",
284 (int)curl_message->msg);
285 }
286 curl_message = curl_multi_info_read(curlm, &num_messages);
287 }
288 }
289 #endif
290
291 static int http_options(const char *var, const char *value, void *cb)
292 {
293 if (!strcmp("http.version", var)) {
294 return git_config_string(&curl_http_version, var, value);
295 }
296 if (!strcmp("http.sslverify", var)) {
297 curl_ssl_verify = git_config_bool(var, value);
298 return 0;
299 }
300 if (!strcmp("http.sslcipherlist", var))
301 return git_config_string(&ssl_cipherlist, var, value);
302 if (!strcmp("http.sslversion", var))
303 return git_config_string(&ssl_version, var, value);
304 if (!strcmp("http.sslcert", var))
305 return git_config_pathname(&ssl_cert, var, value);
306 #if LIBCURL_VERSION_NUM >= 0x070903
307 if (!strcmp("http.sslkey", var))
308 return git_config_pathname(&ssl_key, var, value);
309 #endif
310 #if LIBCURL_VERSION_NUM >= 0x070908
311 if (!strcmp("http.sslcapath", var))
312 return git_config_pathname(&ssl_capath, var, value);
313 #endif
314 if (!strcmp("http.sslcainfo", var))
315 return git_config_pathname(&ssl_cainfo, var, value);
316 if (!strcmp("http.sslcertpasswordprotected", var)) {
317 ssl_cert_password_required = git_config_bool(var, value);
318 return 0;
319 }
320 if (!strcmp("http.ssltry", var)) {
321 curl_ssl_try = git_config_bool(var, value);
322 return 0;
323 }
324 if (!strcmp("http.sslbackend", var)) {
325 free(http_ssl_backend);
326 http_ssl_backend = xstrdup_or_null(value);
327 return 0;
328 }
329
330 if (!strcmp("http.schannelcheckrevoke", var)) {
331 http_schannel_check_revoke = git_config_bool(var, value);
332 return 0;
333 }
334
335 if (!strcmp("http.schannelusesslcainfo", var)) {
336 http_schannel_use_ssl_cainfo = git_config_bool(var, value);
337 return 0;
338 }
339
340 if (!strcmp("http.minsessions", var)) {
341 min_curl_sessions = git_config_int(var, value);
342 #ifndef USE_CURL_MULTI
343 if (min_curl_sessions > 1)
344 min_curl_sessions = 1;
345 #endif
346 return 0;
347 }
348 #ifdef USE_CURL_MULTI
349 if (!strcmp("http.maxrequests", var)) {
350 max_requests = git_config_int(var, value);
351 return 0;
352 }
353 #endif
354 if (!strcmp("http.lowspeedlimit", var)) {
355 curl_low_speed_limit = (long)git_config_int(var, value);
356 return 0;
357 }
358 if (!strcmp("http.lowspeedtime", var)) {
359 curl_low_speed_time = (long)git_config_int(var, value);
360 return 0;
361 }
362
363 if (!strcmp("http.noepsv", var)) {
364 curl_ftp_no_epsv = git_config_bool(var, value);
365 return 0;
366 }
367 if (!strcmp("http.proxy", var))
368 return git_config_string(&curl_http_proxy, var, value);
369
370 if (!strcmp("http.proxyauthmethod", var))
371 return git_config_string(&http_proxy_authmethod, var, value);
372
373 if (!strcmp("http.proxysslcert", var))
374 return git_config_string(&http_proxy_ssl_cert, var, value);
375
376 if (!strcmp("http.proxysslkey", var))
377 return git_config_string(&http_proxy_ssl_key, var, value);
378
379 if (!strcmp("http.proxysslcainfo", var))
380 return git_config_string(&http_proxy_ssl_ca_info, var, value);
381
382 if (!strcmp("http.proxysslcertpasswordprotected", var)) {
383 proxy_ssl_cert_password_required = git_config_bool(var, value);
384 return 0;
385 }
386
387 if (!strcmp("http.cookiefile", var))
388 return git_config_pathname(&curl_cookie_file, var, value);
389 if (!strcmp("http.savecookies", var)) {
390 curl_save_cookies = git_config_bool(var, value);
391 return 0;
392 }
393
394 if (!strcmp("http.postbuffer", var)) {
395 http_post_buffer = git_config_ssize_t(var, value);
396 if (http_post_buffer < 0)
397 warning(_("negative value for http.postbuffer; defaulting to %d"), LARGE_PACKET_MAX);
398 if (http_post_buffer < LARGE_PACKET_MAX)
399 http_post_buffer = LARGE_PACKET_MAX;
400 return 0;
401 }
402
403 if (!strcmp("http.useragent", var))
404 return git_config_string(&user_agent, var, value);
405
406 if (!strcmp("http.emptyauth", var)) {
407 if (value && !strcmp("auto", value))
408 curl_empty_auth = -1;
409 else
410 curl_empty_auth = git_config_bool(var, value);
411 return 0;
412 }
413
414 if (!strcmp("http.delegation", var)) {
415 #ifdef CURLGSSAPI_DELEGATION_FLAG
416 return git_config_string(&curl_deleg, var, value);
417 #else
418 warning(_("Delegation control is not supported with cURL < 7.22.0"));
419 return 0;
420 #endif
421 }
422
423 if (!strcmp("http.pinnedpubkey", var)) {
424 #if LIBCURL_VERSION_NUM >= 0x072c00
425 return git_config_pathname(&ssl_pinnedkey, var, value);
426 #else
427 warning(_("Public key pinning not supported with cURL < 7.44.0"));
428 return 0;
429 #endif
430 }
431
432 if (!strcmp("http.extraheader", var)) {
433 if (!value) {
434 return config_error_nonbool(var);
435 } else if (!*value) {
436 string_list_clear(&extra_http_headers, 0);
437 } else {
438 string_list_append(&extra_http_headers, value);
439 }
440 return 0;
441 }
442
443 if (!strcmp("http.followredirects", var)) {
444 if (value && !strcmp(value, "initial"))
445 http_follow_config = HTTP_FOLLOW_INITIAL;
446 else if (git_config_bool(var, value))
447 http_follow_config = HTTP_FOLLOW_ALWAYS;
448 else
449 http_follow_config = HTTP_FOLLOW_NONE;
450 return 0;
451 }
452
453 /* Fall back on the default ones */
454 return git_default_config(var, value, cb);
455 }
456
457 static int curl_empty_auth_enabled(void)
458 {
459 if (curl_empty_auth >= 0)
460 return curl_empty_auth;
461
462 #ifndef LIBCURL_CAN_HANDLE_AUTH_ANY
463 /*
464 * Our libcurl is too old to do AUTH_ANY in the first place;
465 * just default to turning the feature off.
466 */
467 #else
468 /*
469 * In the automatic case, kick in the empty-auth
470 * hack as long as we would potentially try some
471 * method more exotic than "Basic" or "Digest".
472 *
473 * But only do this when this is our second or
474 * subsequent request, as by then we know what
475 * methods are available.
476 */
477 if (http_auth_methods_restricted &&
478 (http_auth_methods & ~empty_auth_useless))
479 return 1;
480 #endif
481 return 0;
482 }
483
484 static void init_curl_http_auth(CURL *result)
485 {
486 if (!http_auth.username || !*http_auth.username) {
487 if (curl_empty_auth_enabled())
488 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
489 return;
490 }
491
492 credential_fill(&http_auth);
493
494 #if LIBCURL_VERSION_NUM >= 0x071301
495 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
496 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
497 #else
498 {
499 static struct strbuf up = STRBUF_INIT;
500 /*
501 * Note that we assume we only ever have a single set of
502 * credentials in a given program run, so we do not have
503 * to worry about updating this buffer, only setting its
504 * initial value.
505 */
506 if (!up.len)
507 strbuf_addf(&up, "%s:%s",
508 http_auth.username, http_auth.password);
509 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
510 }
511 #endif
512 }
513
514 /* *var must be free-able */
515 static void var_override(const char **var, char *value)
516 {
517 if (value) {
518 free((void *)*var);
519 *var = xstrdup(value);
520 }
521 }
522
523 static void set_proxyauth_name_password(CURL *result)
524 {
525 #if LIBCURL_VERSION_NUM >= 0x071301
526 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
527 proxy_auth.username);
528 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
529 proxy_auth.password);
530 #else
531 struct strbuf s = STRBUF_INIT;
532
533 strbuf_addstr_urlencode(&s, proxy_auth.username,
534 is_rfc3986_unreserved);
535 strbuf_addch(&s, ':');
536 strbuf_addstr_urlencode(&s, proxy_auth.password,
537 is_rfc3986_unreserved);
538 curl_proxyuserpwd = strbuf_detach(&s, NULL);
539 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
540 #endif
541 }
542
543 static void init_curl_proxy_auth(CURL *result)
544 {
545 if (proxy_auth.username) {
546 if (!proxy_auth.password)
547 credential_fill(&proxy_auth);
548 set_proxyauth_name_password(result);
549 }
550
551 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
552
553 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
554 if (http_proxy_authmethod) {
555 int i;
556 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
557 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
558 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
559 proxy_authmethods[i].curlauth_param);
560 break;
561 }
562 }
563 if (i == ARRAY_SIZE(proxy_authmethods)) {
564 warning("unsupported proxy authentication method %s: using anyauth",
565 http_proxy_authmethod);
566 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
567 }
568 }
569 else
570 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
571 #endif
572 }
573
574 static int has_cert_password(void)
575 {
576 if (ssl_cert == NULL || ssl_cert_password_required != 1)
577 return 0;
578 if (!cert_auth.password) {
579 cert_auth.protocol = xstrdup("cert");
580 cert_auth.host = xstrdup("");
581 cert_auth.username = xstrdup("");
582 cert_auth.path = xstrdup(ssl_cert);
583 credential_fill(&cert_auth);
584 }
585 return 1;
586 }
587
588 #if LIBCURL_VERSION_NUM >= 0x073400
589 static int has_proxy_cert_password(void)
590 {
591 if (http_proxy_ssl_cert == NULL || proxy_ssl_cert_password_required != 1)
592 return 0;
593 if (!proxy_cert_auth.password) {
594 proxy_cert_auth.protocol = xstrdup("cert");
595 proxy_cert_auth.host = xstrdup("");
596 proxy_cert_auth.username = xstrdup("");
597 proxy_cert_auth.path = xstrdup(http_proxy_ssl_cert);
598 credential_fill(&proxy_cert_auth);
599 }
600 return 1;
601 }
602 #endif
603
604 #if LIBCURL_VERSION_NUM >= 0x071900
605 static void set_curl_keepalive(CURL *c)
606 {
607 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
608 }
609
610 #elif LIBCURL_VERSION_NUM >= 0x071000
611 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
612 {
613 int ka = 1;
614 int rc;
615 socklen_t len = (socklen_t)sizeof(ka);
616
617 if (type != CURLSOCKTYPE_IPCXN)
618 return 0;
619
620 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
621 if (rc < 0)
622 warning_errno("unable to set SO_KEEPALIVE on socket");
623
624 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
625 }
626
627 static void set_curl_keepalive(CURL *c)
628 {
629 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
630 }
631
632 #else
633 static void set_curl_keepalive(CURL *c)
634 {
635 /* not supported on older curl versions */
636 }
637 #endif
638
639 static void redact_sensitive_header(struct strbuf *header)
640 {
641 const char *sensitive_header;
642
643 if (trace_curl_redact &&
644 (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
645 skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header))) {
646 /* The first token is the type, which is OK to log */
647 while (isspace(*sensitive_header))
648 sensitive_header++;
649 while (*sensitive_header && !isspace(*sensitive_header))
650 sensitive_header++;
651 /* Everything else is opaque and possibly sensitive */
652 strbuf_setlen(header, sensitive_header - header->buf);
653 strbuf_addstr(header, " <redacted>");
654 } else if (trace_curl_redact &&
655 skip_prefix(header->buf, "Cookie:", &sensitive_header)) {
656 struct strbuf redacted_header = STRBUF_INIT;
657 const char *cookie;
658
659 while (isspace(*sensitive_header))
660 sensitive_header++;
661
662 cookie = sensitive_header;
663
664 while (cookie) {
665 char *equals;
666 char *semicolon = strstr(cookie, "; ");
667 if (semicolon)
668 *semicolon = 0;
669 equals = strchrnul(cookie, '=');
670 if (!equals) {
671 /* invalid cookie, just append and continue */
672 strbuf_addstr(&redacted_header, cookie);
673 continue;
674 }
675 strbuf_add(&redacted_header, cookie, equals - cookie);
676 strbuf_addstr(&redacted_header, "=<redacted>");
677 if (semicolon) {
678 /*
679 * There are more cookies. (Or, for some
680 * reason, the input string ends in "; ".)
681 */
682 strbuf_addstr(&redacted_header, "; ");
683 cookie = semicolon + strlen("; ");
684 } else {
685 cookie = NULL;
686 }
687 }
688
689 strbuf_setlen(header, sensitive_header - header->buf);
690 strbuf_addbuf(header, &redacted_header);
691 }
692 }
693
694 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
695 {
696 struct strbuf out = STRBUF_INIT;
697 struct strbuf **headers, **header;
698
699 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
700 text, (long)size, (long)size);
701 trace_strbuf(&trace_curl, &out);
702 strbuf_reset(&out);
703 strbuf_add(&out, ptr, size);
704 headers = strbuf_split_max(&out, '\n', 0);
705
706 for (header = headers; *header; header++) {
707 if (hide_sensitive_header)
708 redact_sensitive_header(*header);
709 strbuf_insertstr((*header), 0, text);
710 strbuf_insertstr((*header), strlen(text), ": ");
711 strbuf_rtrim((*header));
712 strbuf_addch((*header), '\n');
713 trace_strbuf(&trace_curl, (*header));
714 }
715 strbuf_list_free(headers);
716 strbuf_release(&out);
717 }
718
719 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
720 {
721 size_t i;
722 struct strbuf out = STRBUF_INIT;
723 unsigned int width = 60;
724
725 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
726 text, (long)size, (long)size);
727 trace_strbuf(&trace_curl, &out);
728
729 for (i = 0; i < size; i += width) {
730 size_t w;
731
732 strbuf_reset(&out);
733 strbuf_addf(&out, "%s: ", text);
734 for (w = 0; (w < width) && (i + w < size); w++) {
735 unsigned char ch = ptr[i + w];
736
737 strbuf_addch(&out,
738 (ch >= 0x20) && (ch < 0x80)
739 ? ch : '.');
740 }
741 strbuf_addch(&out, '\n');
742 trace_strbuf(&trace_curl, &out);
743 }
744 strbuf_release(&out);
745 }
746
747 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
748 {
749 const char *text;
750 enum { NO_FILTER = 0, DO_FILTER = 1 };
751
752 switch (type) {
753 case CURLINFO_TEXT:
754 trace_printf_key(&trace_curl, "== Info: %s", data);
755 break;
756 case CURLINFO_HEADER_OUT:
757 text = "=> Send header";
758 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
759 break;
760 case CURLINFO_DATA_OUT:
761 if (trace_curl_data) {
762 text = "=> Send data";
763 curl_dump_data(text, (unsigned char *)data, size);
764 }
765 break;
766 case CURLINFO_SSL_DATA_OUT:
767 if (trace_curl_data) {
768 text = "=> Send SSL data";
769 curl_dump_data(text, (unsigned char *)data, size);
770 }
771 break;
772 case CURLINFO_HEADER_IN:
773 text = "<= Recv header";
774 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
775 break;
776 case CURLINFO_DATA_IN:
777 if (trace_curl_data) {
778 text = "<= Recv data";
779 curl_dump_data(text, (unsigned char *)data, size);
780 }
781 break;
782 case CURLINFO_SSL_DATA_IN:
783 if (trace_curl_data) {
784 text = "<= Recv SSL data";
785 curl_dump_data(text, (unsigned char *)data, size);
786 }
787 break;
788
789 default: /* we ignore unknown types by default */
790 return 0;
791 }
792 return 0;
793 }
794
795 void http_trace_curl_no_data(void)
796 {
797 trace_override_envvar(&trace_curl, "1");
798 trace_curl_data = 0;
799 }
800
801 void setup_curl_trace(CURL *handle)
802 {
803 if (!trace_want(&trace_curl))
804 return;
805 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
806 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
807 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
808 }
809
810 #ifdef CURLPROTO_HTTP
811 static long get_curl_allowed_protocols(int from_user)
812 {
813 long allowed_protocols = 0;
814
815 if (is_transport_allowed("http", from_user))
816 allowed_protocols |= CURLPROTO_HTTP;
817 if (is_transport_allowed("https", from_user))
818 allowed_protocols |= CURLPROTO_HTTPS;
819 if (is_transport_allowed("ftp", from_user))
820 allowed_protocols |= CURLPROTO_FTP;
821 if (is_transport_allowed("ftps", from_user))
822 allowed_protocols |= CURLPROTO_FTPS;
823
824 return allowed_protocols;
825 }
826 #endif
827
828 #if LIBCURL_VERSION_NUM >=0x072f00
829 static int get_curl_http_version_opt(const char *version_string, long *opt)
830 {
831 int i;
832 static struct {
833 const char *name;
834 long opt_token;
835 } choice[] = {
836 { "HTTP/1.1", CURL_HTTP_VERSION_1_1 },
837 { "HTTP/2", CURL_HTTP_VERSION_2 }
838 };
839
840 for (i = 0; i < ARRAY_SIZE(choice); i++) {
841 if (!strcmp(version_string, choice[i].name)) {
842 *opt = choice[i].opt_token;
843 return 0;
844 }
845 }
846
847 warning("unknown value given to http.version: '%s'", version_string);
848 return -1; /* not found */
849 }
850
851 #endif
852
853 static CURL *get_curl_handle(void)
854 {
855 CURL *result = curl_easy_init();
856
857 if (!result)
858 die("curl_easy_init failed");
859
860 if (!curl_ssl_verify) {
861 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
862 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
863 } else {
864 /* Verify authenticity of the peer's certificate */
865 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
866 /* The name in the cert must match whom we tried to connect */
867 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
868 }
869
870 #if LIBCURL_VERSION_NUM >= 0x072f00 // 7.47.0
871 if (curl_http_version) {
872 long opt;
873 if (!get_curl_http_version_opt(curl_http_version, &opt)) {
874 /* Set request use http version */
875 curl_easy_setopt(result, CURLOPT_HTTP_VERSION, opt);
876 }
877 }
878 #endif
879
880 #if LIBCURL_VERSION_NUM >= 0x070907
881 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
882 #endif
883 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
884 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
885 #endif
886
887 #ifdef CURLGSSAPI_DELEGATION_FLAG
888 if (curl_deleg) {
889 int i;
890 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
891 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
892 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
893 curl_deleg_levels[i].curl_deleg_param);
894 break;
895 }
896 }
897 if (i == ARRAY_SIZE(curl_deleg_levels))
898 warning("Unknown delegation method '%s': using default",
899 curl_deleg);
900 }
901 #endif
902
903 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
904 !http_schannel_check_revoke) {
905 #if LIBCURL_VERSION_NUM >= 0x072c00
906 curl_easy_setopt(result, CURLOPT_SSL_OPTIONS, CURLSSLOPT_NO_REVOKE);
907 #else
908 warning(_("CURLSSLOPT_NO_REVOKE not supported with cURL < 7.44.0"));
909 #endif
910 }
911
912 if (http_proactive_auth)
913 init_curl_http_auth(result);
914
915 if (getenv("GIT_SSL_VERSION"))
916 ssl_version = getenv("GIT_SSL_VERSION");
917 if (ssl_version && *ssl_version) {
918 int i;
919 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
920 if (!strcmp(ssl_version, sslversions[i].name)) {
921 curl_easy_setopt(result, CURLOPT_SSLVERSION,
922 sslversions[i].ssl_version);
923 break;
924 }
925 }
926 if (i == ARRAY_SIZE(sslversions))
927 warning("unsupported ssl version %s: using default",
928 ssl_version);
929 }
930
931 if (getenv("GIT_SSL_CIPHER_LIST"))
932 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
933 if (ssl_cipherlist != NULL && *ssl_cipherlist)
934 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
935 ssl_cipherlist);
936
937 if (ssl_cert != NULL)
938 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
939 if (has_cert_password())
940 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
941 #if LIBCURL_VERSION_NUM >= 0x070903
942 if (ssl_key != NULL)
943 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
944 #endif
945 #if LIBCURL_VERSION_NUM >= 0x070908
946 if (ssl_capath != NULL)
947 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
948 #endif
949 #if LIBCURL_VERSION_NUM >= 0x072c00
950 if (ssl_pinnedkey != NULL)
951 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
952 #endif
953 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
954 !http_schannel_use_ssl_cainfo) {
955 curl_easy_setopt(result, CURLOPT_CAINFO, NULL);
956 #if LIBCURL_VERSION_NUM >= 0x073400
957 curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, NULL);
958 #endif
959 } else if (ssl_cainfo != NULL || http_proxy_ssl_ca_info != NULL) {
960 if (ssl_cainfo != NULL)
961 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
962 #if LIBCURL_VERSION_NUM >= 0x073400
963 if (http_proxy_ssl_ca_info != NULL)
964 curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, http_proxy_ssl_ca_info);
965 #endif
966 }
967
968 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
969 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
970 curl_low_speed_limit);
971 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
972 curl_low_speed_time);
973 }
974
975 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
976 #if LIBCURL_VERSION_NUM >= 0x071301
977 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
978 #elif LIBCURL_VERSION_NUM >= 0x071101
979 curl_easy_setopt(result, CURLOPT_POST301, 1);
980 #endif
981 #ifdef CURLPROTO_HTTP
982 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
983 get_curl_allowed_protocols(0));
984 curl_easy_setopt(result, CURLOPT_PROTOCOLS,
985 get_curl_allowed_protocols(-1));
986 #else
987 warning(_("Protocol restrictions not supported with cURL < 7.19.4"));
988 #endif
989 if (getenv("GIT_CURL_VERBOSE"))
990 http_trace_curl_no_data();
991 setup_curl_trace(result);
992 if (getenv("GIT_TRACE_CURL_NO_DATA"))
993 trace_curl_data = 0;
994 if (!git_env_bool("GIT_TRACE_REDACT", 1))
995 trace_curl_redact = 0;
996
997 curl_easy_setopt(result, CURLOPT_USERAGENT,
998 user_agent ? user_agent : git_user_agent());
999
1000 if (curl_ftp_no_epsv)
1001 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
1002
1003 #ifdef CURLOPT_USE_SSL
1004 if (curl_ssl_try)
1005 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
1006 #endif
1007
1008 /*
1009 * CURL also examines these variables as a fallback; but we need to query
1010 * them here in order to decide whether to prompt for missing password (cf.
1011 * init_curl_proxy_auth()).
1012 *
1013 * Unlike many other common environment variables, these are historically
1014 * lowercase only. It appears that CURL did not know this and implemented
1015 * only uppercase variants, which was later corrected to take both - with
1016 * the exception of http_proxy, which is lowercase only also in CURL. As
1017 * the lowercase versions are the historical quasi-standard, they take
1018 * precedence here, as in CURL.
1019 */
1020 if (!curl_http_proxy) {
1021 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
1022 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
1023 var_override(&curl_http_proxy, getenv("https_proxy"));
1024 } else {
1025 var_override(&curl_http_proxy, getenv("http_proxy"));
1026 }
1027 if (!curl_http_proxy) {
1028 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
1029 var_override(&curl_http_proxy, getenv("all_proxy"));
1030 }
1031 }
1032
1033 if (curl_http_proxy && curl_http_proxy[0] == '\0') {
1034 /*
1035 * Handle case with the empty http.proxy value here to keep
1036 * common code clean.
1037 * NB: empty option disables proxying at all.
1038 */
1039 curl_easy_setopt(result, CURLOPT_PROXY, "");
1040 } else if (curl_http_proxy) {
1041 #if LIBCURL_VERSION_NUM >= 0x071800
1042 if (starts_with(curl_http_proxy, "socks5h"))
1043 curl_easy_setopt(result,
1044 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
1045 else if (starts_with(curl_http_proxy, "socks5"))
1046 curl_easy_setopt(result,
1047 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
1048 else if (starts_with(curl_http_proxy, "socks4a"))
1049 curl_easy_setopt(result,
1050 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
1051 else if (starts_with(curl_http_proxy, "socks"))
1052 curl_easy_setopt(result,
1053 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
1054 #endif
1055 #if LIBCURL_VERSION_NUM >= 0x073400
1056 else if (starts_with(curl_http_proxy, "https")) {
1057 curl_easy_setopt(result, CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
1058
1059 if (http_proxy_ssl_cert)
1060 curl_easy_setopt(result, CURLOPT_PROXY_SSLCERT, http_proxy_ssl_cert);
1061
1062 if (http_proxy_ssl_key)
1063 curl_easy_setopt(result, CURLOPT_PROXY_SSLKEY, http_proxy_ssl_key);
1064
1065 if (has_proxy_cert_password())
1066 curl_easy_setopt(result, CURLOPT_PROXY_KEYPASSWD, proxy_cert_auth.password);
1067 }
1068 #endif
1069 if (strstr(curl_http_proxy, "://"))
1070 credential_from_url(&proxy_auth, curl_http_proxy);
1071 else {
1072 struct strbuf url = STRBUF_INIT;
1073 strbuf_addf(&url, "http://%s", curl_http_proxy);
1074 credential_from_url(&proxy_auth, url.buf);
1075 strbuf_release(&url);
1076 }
1077
1078 if (!proxy_auth.host)
1079 die("Invalid proxy URL '%s'", curl_http_proxy);
1080
1081 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
1082 #if LIBCURL_VERSION_NUM >= 0x071304
1083 var_override(&curl_no_proxy, getenv("NO_PROXY"));
1084 var_override(&curl_no_proxy, getenv("no_proxy"));
1085 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
1086 #endif
1087 }
1088 init_curl_proxy_auth(result);
1089
1090 set_curl_keepalive(result);
1091
1092 return result;
1093 }
1094
1095 static void set_from_env(const char **var, const char *envname)
1096 {
1097 const char *val = getenv(envname);
1098 if (val)
1099 *var = val;
1100 }
1101
1102 void http_init(struct remote *remote, const char *url, int proactive_auth)
1103 {
1104 char *low_speed_limit;
1105 char *low_speed_time;
1106 char *normalized_url;
1107 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
1108
1109 config.section = "http";
1110 config.key = NULL;
1111 config.collect_fn = http_options;
1112 config.cascade_fn = git_default_config;
1113 config.cb = NULL;
1114
1115 http_is_verbose = 0;
1116 normalized_url = url_normalize(url, &config.url);
1117
1118 git_config(urlmatch_config_entry, &config);
1119 free(normalized_url);
1120 string_list_clear(&config.vars, 1);
1121
1122 #if LIBCURL_VERSION_NUM >= 0x073800
1123 if (http_ssl_backend) {
1124 const curl_ssl_backend **backends;
1125 struct strbuf buf = STRBUF_INIT;
1126 int i;
1127
1128 switch (curl_global_sslset(-1, http_ssl_backend, &backends)) {
1129 case CURLSSLSET_UNKNOWN_BACKEND:
1130 strbuf_addf(&buf, _("Unsupported SSL backend '%s'. "
1131 "Supported SSL backends:"),
1132 http_ssl_backend);
1133 for (i = 0; backends[i]; i++)
1134 strbuf_addf(&buf, "\n\t%s", backends[i]->name);
1135 die("%s", buf.buf);
1136 case CURLSSLSET_NO_BACKENDS:
1137 die(_("Could not set SSL backend to '%s': "
1138 "cURL was built without SSL backends"),
1139 http_ssl_backend);
1140 case CURLSSLSET_TOO_LATE:
1141 die(_("Could not set SSL backend to '%s': already set"),
1142 http_ssl_backend);
1143 case CURLSSLSET_OK:
1144 break; /* Okay! */
1145 }
1146 }
1147 #endif
1148
1149 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1150 die("curl_global_init failed");
1151
1152 http_proactive_auth = proactive_auth;
1153
1154 if (remote && remote->http_proxy)
1155 curl_http_proxy = xstrdup(remote->http_proxy);
1156
1157 if (remote)
1158 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
1159
1160 pragma_header = curl_slist_append(http_copy_default_headers(),
1161 "Pragma: no-cache");
1162 no_pragma_header = curl_slist_append(http_copy_default_headers(),
1163 "Pragma:");
1164
1165 #ifdef USE_CURL_MULTI
1166 {
1167 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1168 if (http_max_requests != NULL)
1169 max_requests = atoi(http_max_requests);
1170 }
1171
1172 curlm = curl_multi_init();
1173 if (!curlm)
1174 die("curl_multi_init failed");
1175 #endif
1176
1177 if (getenv("GIT_SSL_NO_VERIFY"))
1178 curl_ssl_verify = 0;
1179
1180 set_from_env(&ssl_cert, "GIT_SSL_CERT");
1181 #if LIBCURL_VERSION_NUM >= 0x070903
1182 set_from_env(&ssl_key, "GIT_SSL_KEY");
1183 #endif
1184 #if LIBCURL_VERSION_NUM >= 0x070908
1185 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
1186 #endif
1187 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
1188
1189 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
1190
1191 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1192 if (low_speed_limit != NULL)
1193 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1194 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1195 if (low_speed_time != NULL)
1196 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1197
1198 if (curl_ssl_verify == -1)
1199 curl_ssl_verify = 1;
1200
1201 curl_session_count = 0;
1202 #ifdef USE_CURL_MULTI
1203 if (max_requests < 1)
1204 max_requests = DEFAULT_MAX_REQUESTS;
1205 #endif
1206
1207 set_from_env(&http_proxy_ssl_cert, "GIT_PROXY_SSL_CERT");
1208 set_from_env(&http_proxy_ssl_key, "GIT_PROXY_SSL_KEY");
1209 set_from_env(&http_proxy_ssl_ca_info, "GIT_PROXY_SSL_CAINFO");
1210
1211 if (getenv("GIT_PROXY_SSL_CERT_PASSWORD_PROTECTED"))
1212 proxy_ssl_cert_password_required = 1;
1213
1214 if (getenv("GIT_CURL_FTP_NO_EPSV"))
1215 curl_ftp_no_epsv = 1;
1216
1217 if (url) {
1218 credential_from_url(&http_auth, url);
1219 if (!ssl_cert_password_required &&
1220 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1221 starts_with(url, "https://"))
1222 ssl_cert_password_required = 1;
1223 }
1224
1225 #ifndef NO_CURL_EASY_DUPHANDLE
1226 curl_default = get_curl_handle();
1227 #endif
1228 }
1229
1230 void http_cleanup(void)
1231 {
1232 struct active_request_slot *slot = active_queue_head;
1233
1234 while (slot != NULL) {
1235 struct active_request_slot *next = slot->next;
1236 if (slot->curl != NULL) {
1237 xmulti_remove_handle(slot);
1238 curl_easy_cleanup(slot->curl);
1239 }
1240 free(slot);
1241 slot = next;
1242 }
1243 active_queue_head = NULL;
1244
1245 #ifndef NO_CURL_EASY_DUPHANDLE
1246 curl_easy_cleanup(curl_default);
1247 #endif
1248
1249 #ifdef USE_CURL_MULTI
1250 curl_multi_cleanup(curlm);
1251 #endif
1252 curl_global_cleanup();
1253
1254 string_list_clear(&extra_http_headers, 0);
1255
1256 curl_slist_free_all(pragma_header);
1257 pragma_header = NULL;
1258
1259 curl_slist_free_all(no_pragma_header);
1260 no_pragma_header = NULL;
1261
1262 if (curl_http_proxy) {
1263 free((void *)curl_http_proxy);
1264 curl_http_proxy = NULL;
1265 }
1266
1267 if (proxy_auth.password) {
1268 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1269 FREE_AND_NULL(proxy_auth.password);
1270 }
1271
1272 free((void *)curl_proxyuserpwd);
1273 curl_proxyuserpwd = NULL;
1274
1275 free((void *)http_proxy_authmethod);
1276 http_proxy_authmethod = NULL;
1277
1278 if (cert_auth.password != NULL) {
1279 memset(cert_auth.password, 0, strlen(cert_auth.password));
1280 FREE_AND_NULL(cert_auth.password);
1281 }
1282 ssl_cert_password_required = 0;
1283
1284 if (proxy_cert_auth.password != NULL) {
1285 memset(proxy_cert_auth.password, 0, strlen(proxy_cert_auth.password));
1286 FREE_AND_NULL(proxy_cert_auth.password);
1287 }
1288 proxy_ssl_cert_password_required = 0;
1289
1290 FREE_AND_NULL(cached_accept_language);
1291 }
1292
1293 struct active_request_slot *get_active_slot(void)
1294 {
1295 struct active_request_slot *slot = active_queue_head;
1296 struct active_request_slot *newslot;
1297
1298 #ifdef USE_CURL_MULTI
1299 int num_transfers;
1300
1301 /* Wait for a slot to open up if the queue is full */
1302 while (active_requests >= max_requests) {
1303 curl_multi_perform(curlm, &num_transfers);
1304 if (num_transfers < active_requests)
1305 process_curl_messages();
1306 }
1307 #endif
1308
1309 while (slot != NULL && slot->in_use)
1310 slot = slot->next;
1311
1312 if (slot == NULL) {
1313 newslot = xmalloc(sizeof(*newslot));
1314 newslot->curl = NULL;
1315 newslot->in_use = 0;
1316 newslot->next = NULL;
1317
1318 slot = active_queue_head;
1319 if (slot == NULL) {
1320 active_queue_head = newslot;
1321 } else {
1322 while (slot->next != NULL)
1323 slot = slot->next;
1324 slot->next = newslot;
1325 }
1326 slot = newslot;
1327 }
1328
1329 if (slot->curl == NULL) {
1330 #ifdef NO_CURL_EASY_DUPHANDLE
1331 slot->curl = get_curl_handle();
1332 #else
1333 slot->curl = curl_easy_duphandle(curl_default);
1334 #endif
1335 curl_session_count++;
1336 }
1337
1338 active_requests++;
1339 slot->in_use = 1;
1340 slot->results = NULL;
1341 slot->finished = NULL;
1342 slot->callback_data = NULL;
1343 slot->callback_func = NULL;
1344 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1345 if (curl_save_cookies)
1346 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1347 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1348 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1349 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1350 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1351 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1352 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1353 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1354 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1355 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1356 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1357
1358 /*
1359 * Default following to off unless "ALWAYS" is configured; this gives
1360 * callers a sane starting point, and they can tweak for individual
1361 * HTTP_FOLLOW_* cases themselves.
1362 */
1363 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1364 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1365 else
1366 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1367
1368 #if LIBCURL_VERSION_NUM >= 0x070a08
1369 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1370 #endif
1371 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1372 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1373 #endif
1374 if (http_auth.password || curl_empty_auth_enabled())
1375 init_curl_http_auth(slot->curl);
1376
1377 return slot;
1378 }
1379
1380 int start_active_slot(struct active_request_slot *slot)
1381 {
1382 #ifdef USE_CURL_MULTI
1383 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1384 int num_transfers;
1385
1386 if (curlm_result != CURLM_OK &&
1387 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1388 warning("curl_multi_add_handle failed: %s",
1389 curl_multi_strerror(curlm_result));
1390 active_requests--;
1391 slot->in_use = 0;
1392 return 0;
1393 }
1394
1395 /*
1396 * We know there must be something to do, since we just added
1397 * something.
1398 */
1399 curl_multi_perform(curlm, &num_transfers);
1400 #endif
1401 return 1;
1402 }
1403
1404 #ifdef USE_CURL_MULTI
1405 struct fill_chain {
1406 void *data;
1407 int (*fill)(void *);
1408 struct fill_chain *next;
1409 };
1410
1411 static struct fill_chain *fill_cfg;
1412
1413 void add_fill_function(void *data, int (*fill)(void *))
1414 {
1415 struct fill_chain *new_fill = xmalloc(sizeof(*new_fill));
1416 struct fill_chain **linkp = &fill_cfg;
1417 new_fill->data = data;
1418 new_fill->fill = fill;
1419 new_fill->next = NULL;
1420 while (*linkp)
1421 linkp = &(*linkp)->next;
1422 *linkp = new_fill;
1423 }
1424
1425 void fill_active_slots(void)
1426 {
1427 struct active_request_slot *slot = active_queue_head;
1428
1429 while (active_requests < max_requests) {
1430 struct fill_chain *fill;
1431 for (fill = fill_cfg; fill; fill = fill->next)
1432 if (fill->fill(fill->data))
1433 break;
1434
1435 if (!fill)
1436 break;
1437 }
1438
1439 while (slot != NULL) {
1440 if (!slot->in_use && slot->curl != NULL
1441 && curl_session_count > min_curl_sessions) {
1442 curl_easy_cleanup(slot->curl);
1443 slot->curl = NULL;
1444 curl_session_count--;
1445 }
1446 slot = slot->next;
1447 }
1448 }
1449
1450 void step_active_slots(void)
1451 {
1452 int num_transfers;
1453 CURLMcode curlm_result;
1454
1455 do {
1456 curlm_result = curl_multi_perform(curlm, &num_transfers);
1457 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1458 if (num_transfers < active_requests) {
1459 process_curl_messages();
1460 fill_active_slots();
1461 }
1462 }
1463 #endif
1464
1465 void run_active_slot(struct active_request_slot *slot)
1466 {
1467 #ifdef USE_CURL_MULTI
1468 fd_set readfds;
1469 fd_set writefds;
1470 fd_set excfds;
1471 int max_fd;
1472 struct timeval select_timeout;
1473 int finished = 0;
1474
1475 slot->finished = &finished;
1476 while (!finished) {
1477 step_active_slots();
1478
1479 if (slot->in_use) {
1480 #if LIBCURL_VERSION_NUM >= 0x070f04
1481 long curl_timeout;
1482 curl_multi_timeout(curlm, &curl_timeout);
1483 if (curl_timeout == 0) {
1484 continue;
1485 } else if (curl_timeout == -1) {
1486 select_timeout.tv_sec = 0;
1487 select_timeout.tv_usec = 50000;
1488 } else {
1489 select_timeout.tv_sec = curl_timeout / 1000;
1490 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1491 }
1492 #else
1493 select_timeout.tv_sec = 0;
1494 select_timeout.tv_usec = 50000;
1495 #endif
1496
1497 max_fd = -1;
1498 FD_ZERO(&readfds);
1499 FD_ZERO(&writefds);
1500 FD_ZERO(&excfds);
1501 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1502
1503 /*
1504 * It can happen that curl_multi_timeout returns a pathologically
1505 * long timeout when curl_multi_fdset returns no file descriptors
1506 * to read. See commit message for more details.
1507 */
1508 if (max_fd < 0 &&
1509 (select_timeout.tv_sec > 0 ||
1510 select_timeout.tv_usec > 50000)) {
1511 select_timeout.tv_sec = 0;
1512 select_timeout.tv_usec = 50000;
1513 }
1514
1515 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1516 }
1517 }
1518 #else
1519 while (slot->in_use) {
1520 slot->curl_result = curl_easy_perform(slot->curl);
1521 finish_active_slot(slot);
1522 }
1523 #endif
1524 }
1525
1526 static void release_active_slot(struct active_request_slot *slot)
1527 {
1528 closedown_active_slot(slot);
1529 if (slot->curl) {
1530 xmulti_remove_handle(slot);
1531 if (curl_session_count > min_curl_sessions) {
1532 curl_easy_cleanup(slot->curl);
1533 slot->curl = NULL;
1534 curl_session_count--;
1535 }
1536 }
1537 #ifdef USE_CURL_MULTI
1538 fill_active_slots();
1539 #endif
1540 }
1541
1542 void finish_all_active_slots(void)
1543 {
1544 struct active_request_slot *slot = active_queue_head;
1545
1546 while (slot != NULL)
1547 if (slot->in_use) {
1548 run_active_slot(slot);
1549 slot = active_queue_head;
1550 } else {
1551 slot = slot->next;
1552 }
1553 }
1554
1555 /* Helpers for modifying and creating URLs */
1556 static inline int needs_quote(int ch)
1557 {
1558 if (((ch >= 'A') && (ch <= 'Z'))
1559 || ((ch >= 'a') && (ch <= 'z'))
1560 || ((ch >= '0') && (ch <= '9'))
1561 || (ch == '/')
1562 || (ch == '-')
1563 || (ch == '.'))
1564 return 0;
1565 return 1;
1566 }
1567
1568 static char *quote_ref_url(const char *base, const char *ref)
1569 {
1570 struct strbuf buf = STRBUF_INIT;
1571 const char *cp;
1572 int ch;
1573
1574 end_url_with_slash(&buf, base);
1575
1576 for (cp = ref; (ch = *cp) != 0; cp++)
1577 if (needs_quote(ch))
1578 strbuf_addf(&buf, "%%%02x", ch);
1579 else
1580 strbuf_addch(&buf, *cp);
1581
1582 return strbuf_detach(&buf, NULL);
1583 }
1584
1585 void append_remote_object_url(struct strbuf *buf, const char *url,
1586 const char *hex,
1587 int only_two_digit_prefix)
1588 {
1589 end_url_with_slash(buf, url);
1590
1591 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1592 if (!only_two_digit_prefix)
1593 strbuf_addstr(buf, hex + 2);
1594 }
1595
1596 char *get_remote_object_url(const char *url, const char *hex,
1597 int only_two_digit_prefix)
1598 {
1599 struct strbuf buf = STRBUF_INIT;
1600 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1601 return strbuf_detach(&buf, NULL);
1602 }
1603
1604 void normalize_curl_result(CURLcode *result, long http_code,
1605 char *errorstr, size_t errorlen)
1606 {
1607 /*
1608 * If we see a failing http code with CURLE_OK, we have turned off
1609 * FAILONERROR (to keep the server's custom error response), and should
1610 * translate the code into failure here.
1611 *
1612 * Likewise, if we see a redirect (30x code), that means we turned off
1613 * redirect-following, and we should treat the result as an error.
1614 */
1615 if (*result == CURLE_OK && http_code >= 300) {
1616 *result = CURLE_HTTP_RETURNED_ERROR;
1617 /*
1618 * Normally curl will already have put the "reason phrase"
1619 * from the server into curl_errorstr; unfortunately without
1620 * FAILONERROR it is lost, so we can give only the numeric
1621 * status code.
1622 */
1623 xsnprintf(errorstr, errorlen,
1624 "The requested URL returned error: %ld",
1625 http_code);
1626 }
1627 }
1628
1629 static int handle_curl_result(struct slot_results *results)
1630 {
1631 normalize_curl_result(&results->curl_result, results->http_code,
1632 curl_errorstr, sizeof(curl_errorstr));
1633
1634 if (results->curl_result == CURLE_OK) {
1635 credential_approve(&http_auth);
1636 if (proxy_auth.password)
1637 credential_approve(&proxy_auth);
1638 return HTTP_OK;
1639 } else if (missing_target(results))
1640 return HTTP_MISSING_TARGET;
1641 else if (results->http_code == 401) {
1642 if (http_auth.username && http_auth.password) {
1643 credential_reject(&http_auth);
1644 return HTTP_NOAUTH;
1645 } else {
1646 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1647 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1648 if (results->auth_avail) {
1649 http_auth_methods &= results->auth_avail;
1650 http_auth_methods_restricted = 1;
1651 }
1652 #endif
1653 return HTTP_REAUTH;
1654 }
1655 } else {
1656 if (results->http_connectcode == 407)
1657 credential_reject(&proxy_auth);
1658 #if LIBCURL_VERSION_NUM >= 0x070c00
1659 if (!curl_errorstr[0])
1660 strlcpy(curl_errorstr,
1661 curl_easy_strerror(results->curl_result),
1662 sizeof(curl_errorstr));
1663 #endif
1664 return HTTP_ERROR;
1665 }
1666 }
1667
1668 int run_one_slot(struct active_request_slot *slot,
1669 struct slot_results *results)
1670 {
1671 slot->results = results;
1672 if (!start_active_slot(slot)) {
1673 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1674 "failed to start HTTP request");
1675 return HTTP_START_FAILED;
1676 }
1677
1678 run_active_slot(slot);
1679 return handle_curl_result(results);
1680 }
1681
1682 struct curl_slist *http_copy_default_headers(void)
1683 {
1684 struct curl_slist *headers = NULL;
1685 const struct string_list_item *item;
1686
1687 for_each_string_list_item(item, &extra_http_headers)
1688 headers = curl_slist_append(headers, item->string);
1689
1690 return headers;
1691 }
1692
1693 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1694 {
1695 char *ptr;
1696 CURLcode ret;
1697
1698 strbuf_reset(buf);
1699 ret = curl_easy_getinfo(curl, info, &ptr);
1700 if (!ret && ptr)
1701 strbuf_addstr(buf, ptr);
1702 return ret;
1703 }
1704
1705 /*
1706 * Check for and extract a content-type parameter. "raw"
1707 * should be positioned at the start of the potential
1708 * parameter, with any whitespace already removed.
1709 *
1710 * "name" is the name of the parameter. The value is appended
1711 * to "out".
1712 */
1713 static int extract_param(const char *raw, const char *name,
1714 struct strbuf *out)
1715 {
1716 size_t len = strlen(name);
1717
1718 if (strncasecmp(raw, name, len))
1719 return -1;
1720 raw += len;
1721
1722 if (*raw != '=')
1723 return -1;
1724 raw++;
1725
1726 while (*raw && !isspace(*raw) && *raw != ';')
1727 strbuf_addch(out, *raw++);
1728 return 0;
1729 }
1730
1731 /*
1732 * Extract a normalized version of the content type, with any
1733 * spaces suppressed, all letters lowercased, and no trailing ";"
1734 * or parameters.
1735 *
1736 * Note that we will silently remove even invalid whitespace. For
1737 * example, "text / plain" is specifically forbidden by RFC 2616,
1738 * but "text/plain" is the only reasonable output, and this keeps
1739 * our code simple.
1740 *
1741 * If the "charset" argument is not NULL, store the value of any
1742 * charset parameter there.
1743 *
1744 * Example:
1745 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1746 * "text / plain" -> "text/plain"
1747 */
1748 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1749 struct strbuf *charset)
1750 {
1751 const char *p;
1752
1753 strbuf_reset(type);
1754 strbuf_grow(type, raw->len);
1755 for (p = raw->buf; *p; p++) {
1756 if (isspace(*p))
1757 continue;
1758 if (*p == ';') {
1759 p++;
1760 break;
1761 }
1762 strbuf_addch(type, tolower(*p));
1763 }
1764
1765 if (!charset)
1766 return;
1767
1768 strbuf_reset(charset);
1769 while (*p) {
1770 while (isspace(*p) || *p == ';')
1771 p++;
1772 if (!extract_param(p, "charset", charset))
1773 return;
1774 while (*p && !isspace(*p))
1775 p++;
1776 }
1777
1778 if (!charset->len && starts_with(type->buf, "text/"))
1779 strbuf_addstr(charset, "ISO-8859-1");
1780 }
1781
1782 static void write_accept_language(struct strbuf *buf)
1783 {
1784 /*
1785 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1786 * that, q-value will be smaller than 0.001, the minimum q-value the
1787 * HTTP specification allows. See
1788 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1789 */
1790 const int MAX_DECIMAL_PLACES = 3;
1791 const int MAX_LANGUAGE_TAGS = 1000;
1792 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1793 char **language_tags = NULL;
1794 int num_langs = 0;
1795 const char *s = get_preferred_languages();
1796 int i;
1797 struct strbuf tag = STRBUF_INIT;
1798
1799 /* Don't add Accept-Language header if no language is preferred. */
1800 if (!s)
1801 return;
1802
1803 /*
1804 * Split the colon-separated string of preferred languages into
1805 * language_tags array.
1806 */
1807 do {
1808 /* collect language tag */
1809 for (; *s && (isalnum(*s) || *s == '_'); s++)
1810 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1811
1812 /* skip .codeset, @modifier and any other unnecessary parts */
1813 while (*s && *s != ':')
1814 s++;
1815
1816 if (tag.len) {
1817 num_langs++;
1818 REALLOC_ARRAY(language_tags, num_langs);
1819 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1820 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1821 break;
1822 }
1823 } while (*s++);
1824
1825 /* write Accept-Language header into buf */
1826 if (num_langs) {
1827 int last_buf_len = 0;
1828 int max_q;
1829 int decimal_places;
1830 char q_format[32];
1831
1832 /* add '*' */
1833 REALLOC_ARRAY(language_tags, num_langs + 1);
1834 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1835
1836 /* compute decimal_places */
1837 for (max_q = 1, decimal_places = 0;
1838 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1839 decimal_places++, max_q *= 10)
1840 ;
1841
1842 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1843
1844 strbuf_addstr(buf, "Accept-Language: ");
1845
1846 for (i = 0; i < num_langs; i++) {
1847 if (i > 0)
1848 strbuf_addstr(buf, ", ");
1849
1850 strbuf_addstr(buf, language_tags[i]);
1851
1852 if (i > 0)
1853 strbuf_addf(buf, q_format, max_q - i);
1854
1855 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1856 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1857 break;
1858 }
1859
1860 last_buf_len = buf->len;
1861 }
1862 }
1863
1864 /* free language tags -- last one is a static '*' */
1865 for (i = 0; i < num_langs - 1; i++)
1866 free(language_tags[i]);
1867 free(language_tags);
1868 }
1869
1870 /*
1871 * Get an Accept-Language header which indicates user's preferred languages.
1872 *
1873 * Examples:
1874 * LANGUAGE= -> ""
1875 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1876 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1877 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1878 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1879 * LANGUAGE= LANG=C -> ""
1880 */
1881 static const char *get_accept_language(void)
1882 {
1883 if (!cached_accept_language) {
1884 struct strbuf buf = STRBUF_INIT;
1885 write_accept_language(&buf);
1886 if (buf.len > 0)
1887 cached_accept_language = strbuf_detach(&buf, NULL);
1888 }
1889
1890 return cached_accept_language;
1891 }
1892
1893 static void http_opt_request_remainder(CURL *curl, off_t pos)
1894 {
1895 char buf[128];
1896 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1897 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1898 }
1899
1900 /* http_request() targets */
1901 #define HTTP_REQUEST_STRBUF 0
1902 #define HTTP_REQUEST_FILE 1
1903
1904 static int http_request(const char *url,
1905 void *result, int target,
1906 const struct http_get_options *options)
1907 {
1908 struct active_request_slot *slot;
1909 struct slot_results results;
1910 struct curl_slist *headers = http_copy_default_headers();
1911 struct strbuf buf = STRBUF_INIT;
1912 const char *accept_language;
1913 int ret;
1914
1915 slot = get_active_slot();
1916 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1917
1918 if (result == NULL) {
1919 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1920 } else {
1921 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1922 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1923
1924 if (target == HTTP_REQUEST_FILE) {
1925 off_t posn = ftello(result);
1926 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1927 fwrite);
1928 if (posn > 0)
1929 http_opt_request_remainder(slot->curl, posn);
1930 } else
1931 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1932 fwrite_buffer);
1933 }
1934
1935 accept_language = get_accept_language();
1936
1937 if (accept_language)
1938 headers = curl_slist_append(headers, accept_language);
1939
1940 strbuf_addstr(&buf, "Pragma:");
1941 if (options && options->no_cache)
1942 strbuf_addstr(&buf, " no-cache");
1943 if (options && options->initial_request &&
1944 http_follow_config == HTTP_FOLLOW_INITIAL)
1945 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1946
1947 headers = curl_slist_append(headers, buf.buf);
1948
1949 /* Add additional headers here */
1950 if (options && options->extra_headers) {
1951 const struct string_list_item *item;
1952 for_each_string_list_item(item, options->extra_headers) {
1953 headers = curl_slist_append(headers, item->string);
1954 }
1955 }
1956
1957 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1958 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1959 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1960 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1961
1962 ret = run_one_slot(slot, &results);
1963
1964 if (options && options->content_type) {
1965 struct strbuf raw = STRBUF_INIT;
1966 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1967 extract_content_type(&raw, options->content_type,
1968 options->charset);
1969 strbuf_release(&raw);
1970 }
1971
1972 if (options && options->effective_url)
1973 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1974 options->effective_url);
1975
1976 curl_slist_free_all(headers);
1977 strbuf_release(&buf);
1978
1979 return ret;
1980 }
1981
1982 /*
1983 * Update the "base" url to a more appropriate value, as deduced by
1984 * redirects seen when requesting a URL starting with "url".
1985 *
1986 * The "asked" parameter is a URL that we asked curl to access, and must begin
1987 * with "base".
1988 *
1989 * The "got" parameter is the URL that curl reported to us as where we ended
1990 * up.
1991 *
1992 * Returns 1 if we updated the base url, 0 otherwise.
1993 *
1994 * Our basic strategy is to compare "base" and "asked" to find the bits
1995 * specific to our request. We then strip those bits off of "got" to yield the
1996 * new base. So for example, if our base is "http://example.com/foo.git",
1997 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1998 * with "https://other.example.com/foo.git/info/refs". We would want the
1999 * new URL to become "https://other.example.com/foo.git".
2000 *
2001 * Note that this assumes a sane redirect scheme. It's entirely possible
2002 * in the example above to end up at a URL that does not even end in
2003 * "info/refs". In such a case we die. There's not much we can do, such a
2004 * scheme is unlikely to represent a real git repository, and failing to
2005 * rewrite the base opens options for malicious redirects to do funny things.
2006 */
2007 static int update_url_from_redirect(struct strbuf *base,
2008 const char *asked,
2009 const struct strbuf *got)
2010 {
2011 const char *tail;
2012 size_t new_len;
2013
2014 if (!strcmp(asked, got->buf))
2015 return 0;
2016
2017 if (!skip_prefix(asked, base->buf, &tail))
2018 BUG("update_url_from_redirect: %s is not a superset of %s",
2019 asked, base->buf);
2020
2021 new_len = got->len;
2022 if (!strip_suffix_mem(got->buf, &new_len, tail))
2023 die(_("unable to update url base from redirection:\n"
2024 " asked for: %s\n"
2025 " redirect: %s"),
2026 asked, got->buf);
2027
2028 strbuf_reset(base);
2029 strbuf_add(base, got->buf, new_len);
2030
2031 return 1;
2032 }
2033
2034 static int http_request_reauth(const char *url,
2035 void *result, int target,
2036 struct http_get_options *options)
2037 {
2038 int ret = http_request(url, result, target, options);
2039
2040 if (ret != HTTP_OK && ret != HTTP_REAUTH)
2041 return ret;
2042
2043 if (options && options->effective_url && options->base_url) {
2044 if (update_url_from_redirect(options->base_url,
2045 url, options->effective_url)) {
2046 credential_from_url(&http_auth, options->base_url->buf);
2047 url = options->effective_url->buf;
2048 }
2049 }
2050
2051 if (ret != HTTP_REAUTH)
2052 return ret;
2053
2054 /*
2055 * The previous request may have put cruft into our output stream; we
2056 * should clear it out before making our next request.
2057 */
2058 switch (target) {
2059 case HTTP_REQUEST_STRBUF:
2060 strbuf_reset(result);
2061 break;
2062 case HTTP_REQUEST_FILE:
2063 if (fflush(result)) {
2064 error_errno("unable to flush a file");
2065 return HTTP_START_FAILED;
2066 }
2067 rewind(result);
2068 if (ftruncate(fileno(result), 0) < 0) {
2069 error_errno("unable to truncate a file");
2070 return HTTP_START_FAILED;
2071 }
2072 break;
2073 default:
2074 BUG("Unknown http_request target");
2075 }
2076
2077 credential_fill(&http_auth);
2078
2079 return http_request(url, result, target, options);
2080 }
2081
2082 int http_get_strbuf(const char *url,
2083 struct strbuf *result,
2084 struct http_get_options *options)
2085 {
2086 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
2087 }
2088
2089 /*
2090 * Downloads a URL and stores the result in the given file.
2091 *
2092 * If a previous interrupted download is detected (i.e. a previous temporary
2093 * file is still around) the download is resumed.
2094 */
2095 static int http_get_file(const char *url, const char *filename,
2096 struct http_get_options *options)
2097 {
2098 int ret;
2099 struct strbuf tmpfile = STRBUF_INIT;
2100 FILE *result;
2101
2102 strbuf_addf(&tmpfile, "%s.temp", filename);
2103 result = fopen(tmpfile.buf, "a");
2104 if (!result) {
2105 error("Unable to open local file %s", tmpfile.buf);
2106 ret = HTTP_ERROR;
2107 goto cleanup;
2108 }
2109
2110 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
2111 fclose(result);
2112
2113 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
2114 ret = HTTP_ERROR;
2115 cleanup:
2116 strbuf_release(&tmpfile);
2117 return ret;
2118 }
2119
2120 int http_fetch_ref(const char *base, struct ref *ref)
2121 {
2122 struct http_get_options options = {0};
2123 char *url;
2124 struct strbuf buffer = STRBUF_INIT;
2125 int ret = -1;
2126
2127 options.no_cache = 1;
2128
2129 url = quote_ref_url(base, ref->name);
2130 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
2131 strbuf_rtrim(&buffer);
2132 if (buffer.len == the_hash_algo->hexsz)
2133 ret = get_oid_hex(buffer.buf, &ref->old_oid);
2134 else if (starts_with(buffer.buf, "ref: ")) {
2135 ref->symref = xstrdup(buffer.buf + 5);
2136 ret = 0;
2137 }
2138 }
2139
2140 strbuf_release(&buffer);
2141 free(url);
2142 return ret;
2143 }
2144
2145 /* Helpers for fetching packs */
2146 static char *fetch_pack_index(unsigned char *hash, const char *base_url)
2147 {
2148 char *url, *tmp;
2149 struct strbuf buf = STRBUF_INIT;
2150
2151 if (http_is_verbose)
2152 fprintf(stderr, "Getting index for pack %s\n", hash_to_hex(hash));
2153
2154 end_url_with_slash(&buf, base_url);
2155 strbuf_addf(&buf, "objects/pack/pack-%s.idx", hash_to_hex(hash));
2156 url = strbuf_detach(&buf, NULL);
2157
2158 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(hash));
2159 tmp = strbuf_detach(&buf, NULL);
2160
2161 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
2162 error("Unable to get pack index %s", url);
2163 FREE_AND_NULL(tmp);
2164 }
2165
2166 free(url);
2167 return tmp;
2168 }
2169
2170 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
2171 unsigned char *sha1, const char *base_url)
2172 {
2173 struct packed_git *new_pack;
2174 char *tmp_idx = NULL;
2175 int ret;
2176
2177 if (has_pack_index(sha1)) {
2178 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
2179 if (!new_pack)
2180 return -1; /* parse_pack_index() already issued error message */
2181 goto add_pack;
2182 }
2183
2184 tmp_idx = fetch_pack_index(sha1, base_url);
2185 if (!tmp_idx)
2186 return -1;
2187
2188 new_pack = parse_pack_index(sha1, tmp_idx);
2189 if (!new_pack) {
2190 unlink(tmp_idx);
2191 free(tmp_idx);
2192
2193 return -1; /* parse_pack_index() already issued error message */
2194 }
2195
2196 ret = verify_pack_index(new_pack);
2197 if (!ret) {
2198 close_pack_index(new_pack);
2199 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
2200 }
2201 free(tmp_idx);
2202 if (ret)
2203 return -1;
2204
2205 add_pack:
2206 new_pack->next = *packs_head;
2207 *packs_head = new_pack;
2208 return 0;
2209 }
2210
2211 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
2212 {
2213 struct http_get_options options = {0};
2214 int ret = 0;
2215 char *url;
2216 const char *data;
2217 struct strbuf buf = STRBUF_INIT;
2218 struct object_id oid;
2219
2220 end_url_with_slash(&buf, base_url);
2221 strbuf_addstr(&buf, "objects/info/packs");
2222 url = strbuf_detach(&buf, NULL);
2223
2224 options.no_cache = 1;
2225 ret = http_get_strbuf(url, &buf, &options);
2226 if (ret != HTTP_OK)
2227 goto cleanup;
2228
2229 data = buf.buf;
2230 while (*data) {
2231 if (skip_prefix(data, "P pack-", &data) &&
2232 !parse_oid_hex(data, &oid, &data) &&
2233 skip_prefix(data, ".pack", &data) &&
2234 (*data == '\n' || *data == '\0')) {
2235 fetch_and_setup_pack_index(packs_head, oid.hash, base_url);
2236 } else {
2237 data = strchrnul(data, '\n');
2238 }
2239 if (*data)
2240 data++; /* skip past newline */
2241 }
2242
2243 cleanup:
2244 free(url);
2245 return ret;
2246 }
2247
2248 void release_http_pack_request(struct http_pack_request *preq)
2249 {
2250 if (preq->packfile != NULL) {
2251 fclose(preq->packfile);
2252 preq->packfile = NULL;
2253 }
2254 preq->slot = NULL;
2255 strbuf_release(&preq->tmpfile);
2256 free(preq->url);
2257 free(preq);
2258 }
2259
2260 int finish_http_pack_request(struct http_pack_request *preq)
2261 {
2262 struct child_process ip = CHILD_PROCESS_INIT;
2263 int tmpfile_fd;
2264 int ret = 0;
2265
2266 fclose(preq->packfile);
2267 preq->packfile = NULL;
2268
2269 tmpfile_fd = xopen(preq->tmpfile.buf, O_RDONLY);
2270
2271 strvec_push(&ip.args, "index-pack");
2272 strvec_push(&ip.args, "--stdin");
2273 ip.git_cmd = 1;
2274 ip.in = tmpfile_fd;
2275 if (preq->generate_keep) {
2276 strvec_pushf(&ip.args, "--keep=git %"PRIuMAX,
2277 (uintmax_t)getpid());
2278 ip.out = 0;
2279 } else {
2280 ip.no_stdout = 1;
2281 }
2282
2283 if (run_command(&ip)) {
2284 ret = -1;
2285 goto cleanup;
2286 }
2287
2288 cleanup:
2289 close(tmpfile_fd);
2290 unlink(preq->tmpfile.buf);
2291 return ret;
2292 }
2293
2294 void http_install_packfile(struct packed_git *p,
2295 struct packed_git **list_to_remove_from)
2296 {
2297 struct packed_git **lst = list_to_remove_from;
2298
2299 while (*lst != p)
2300 lst = &((*lst)->next);
2301 *lst = (*lst)->next;
2302
2303 install_packed_git(the_repository, p);
2304 }
2305
2306 struct http_pack_request *new_http_pack_request(
2307 const unsigned char *packed_git_hash, const char *base_url) {
2308
2309 struct strbuf buf = STRBUF_INIT;
2310
2311 end_url_with_slash(&buf, base_url);
2312 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2313 hash_to_hex(packed_git_hash));
2314 return new_direct_http_pack_request(packed_git_hash,
2315 strbuf_detach(&buf, NULL));
2316 }
2317
2318 struct http_pack_request *new_direct_http_pack_request(
2319 const unsigned char *packed_git_hash, char *url)
2320 {
2321 off_t prev_posn = 0;
2322 struct http_pack_request *preq;
2323
2324 preq = xcalloc(1, sizeof(*preq));
2325 strbuf_init(&preq->tmpfile, 0);
2326
2327 preq->url = url;
2328
2329 strbuf_addf(&preq->tmpfile, "%s.temp", sha1_pack_name(packed_git_hash));
2330 preq->packfile = fopen(preq->tmpfile.buf, "a");
2331 if (!preq->packfile) {
2332 error("Unable to open local file %s for pack",
2333 preq->tmpfile.buf);
2334 goto abort;
2335 }
2336
2337 preq->slot = get_active_slot();
2338 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2339 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2340 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2341 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2342 no_pragma_header);
2343
2344 /*
2345 * If there is data present from a previous transfer attempt,
2346 * resume where it left off
2347 */
2348 prev_posn = ftello(preq->packfile);
2349 if (prev_posn>0) {
2350 if (http_is_verbose)
2351 fprintf(stderr,
2352 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2353 hash_to_hex(packed_git_hash),
2354 (uintmax_t)prev_posn);
2355 http_opt_request_remainder(preq->slot->curl, prev_posn);
2356 }
2357
2358 return preq;
2359
2360 abort:
2361 strbuf_release(&preq->tmpfile);
2362 free(preq->url);
2363 free(preq);
2364 return NULL;
2365 }
2366
2367 /* Helpers for fetching objects (loose) */
2368 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2369 void *data)
2370 {
2371 unsigned char expn[4096];
2372 size_t size = eltsize * nmemb;
2373 int posn = 0;
2374 struct http_object_request *freq = data;
2375 struct active_request_slot *slot = freq->slot;
2376
2377 if (slot) {
2378 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2379 &slot->http_code);
2380 if (c != CURLE_OK)
2381 BUG("curl_easy_getinfo for HTTP code failed: %s",
2382 curl_easy_strerror(c));
2383 if (slot->http_code >= 300)
2384 return nmemb;
2385 }
2386
2387 do {
2388 ssize_t retval = xwrite(freq->localfile,
2389 (char *) ptr + posn, size - posn);
2390 if (retval < 0)
2391 return posn / eltsize;
2392 posn += retval;
2393 } while (posn < size);
2394
2395 freq->stream.avail_in = size;
2396 freq->stream.next_in = (void *)ptr;
2397 do {
2398 freq->stream.next_out = expn;
2399 freq->stream.avail_out = sizeof(expn);
2400 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2401 the_hash_algo->update_fn(&freq->c, expn,
2402 sizeof(expn) - freq->stream.avail_out);
2403 } while (freq->stream.avail_in && freq->zret == Z_OK);
2404 return nmemb;
2405 }
2406
2407 struct http_object_request *new_http_object_request(const char *base_url,
2408 const struct object_id *oid)
2409 {
2410 char *hex = oid_to_hex(oid);
2411 struct strbuf filename = STRBUF_INIT;
2412 struct strbuf prevfile = STRBUF_INIT;
2413 int prevlocal;
2414 char prev_buf[PREV_BUF_SIZE];
2415 ssize_t prev_read = 0;
2416 off_t prev_posn = 0;
2417 struct http_object_request *freq;
2418
2419 freq = xcalloc(1, sizeof(*freq));
2420 strbuf_init(&freq->tmpfile, 0);
2421 oidcpy(&freq->oid, oid);
2422 freq->localfile = -1;
2423
2424 loose_object_path(the_repository, &filename, oid);
2425 strbuf_addf(&freq->tmpfile, "%s.temp", filename.buf);
2426
2427 strbuf_addf(&prevfile, "%s.prev", filename.buf);
2428 unlink_or_warn(prevfile.buf);
2429 rename(freq->tmpfile.buf, prevfile.buf);
2430 unlink_or_warn(freq->tmpfile.buf);
2431 strbuf_release(&filename);
2432
2433 if (freq->localfile != -1)
2434 error("fd leakage in start: %d", freq->localfile);
2435 freq->localfile = open(freq->tmpfile.buf,
2436 O_WRONLY | O_CREAT | O_EXCL, 0666);
2437 /*
2438 * This could have failed due to the "lazy directory creation";
2439 * try to mkdir the last path component.
2440 */
2441 if (freq->localfile < 0 && errno == ENOENT) {
2442 char *dir = strrchr(freq->tmpfile.buf, '/');
2443 if (dir) {
2444 *dir = 0;
2445 mkdir(freq->tmpfile.buf, 0777);
2446 *dir = '/';
2447 }
2448 freq->localfile = open(freq->tmpfile.buf,
2449 O_WRONLY | O_CREAT | O_EXCL, 0666);
2450 }
2451
2452 if (freq->localfile < 0) {
2453 error_errno("Couldn't create temporary file %s",
2454 freq->tmpfile.buf);
2455 goto abort;
2456 }
2457
2458 git_inflate_init(&freq->stream);
2459
2460 the_hash_algo->init_fn(&freq->c);
2461
2462 freq->url = get_remote_object_url(base_url, hex, 0);
2463
2464 /*
2465 * If a previous temp file is present, process what was already
2466 * fetched.
2467 */
2468 prevlocal = open(prevfile.buf, O_RDONLY);
2469 if (prevlocal != -1) {
2470 do {
2471 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2472 if (prev_read>0) {
2473 if (fwrite_sha1_file(prev_buf,
2474 1,
2475 prev_read,
2476 freq) == prev_read) {
2477 prev_posn += prev_read;
2478 } else {
2479 prev_read = -1;
2480 }
2481 }
2482 } while (prev_read > 0);
2483 close(prevlocal);
2484 }
2485 unlink_or_warn(prevfile.buf);
2486 strbuf_release(&prevfile);
2487
2488 /*
2489 * Reset inflate/SHA1 if there was an error reading the previous temp
2490 * file; also rewind to the beginning of the local file.
2491 */
2492 if (prev_read == -1) {
2493 memset(&freq->stream, 0, sizeof(freq->stream));
2494 git_inflate_init(&freq->stream);
2495 the_hash_algo->init_fn(&freq->c);
2496 if (prev_posn>0) {
2497 prev_posn = 0;
2498 lseek(freq->localfile, 0, SEEK_SET);
2499 if (ftruncate(freq->localfile, 0) < 0) {
2500 error_errno("Couldn't truncate temporary file %s",
2501 freq->tmpfile.buf);
2502 goto abort;
2503 }
2504 }
2505 }
2506
2507 freq->slot = get_active_slot();
2508
2509 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2510 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2511 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2512 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2513 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2514 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2515
2516 /*
2517 * If we have successfully processed data from a previous fetch
2518 * attempt, only fetch the data we don't already have.
2519 */
2520 if (prev_posn>0) {
2521 if (http_is_verbose)
2522 fprintf(stderr,
2523 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2524 hex, (uintmax_t)prev_posn);
2525 http_opt_request_remainder(freq->slot->curl, prev_posn);
2526 }
2527
2528 return freq;
2529
2530 abort:
2531 strbuf_release(&prevfile);
2532 free(freq->url);
2533 free(freq);
2534 return NULL;
2535 }
2536
2537 void process_http_object_request(struct http_object_request *freq)
2538 {
2539 if (freq->slot == NULL)
2540 return;
2541 freq->curl_result = freq->slot->curl_result;
2542 freq->http_code = freq->slot->http_code;
2543 freq->slot = NULL;
2544 }
2545
2546 int finish_http_object_request(struct http_object_request *freq)
2547 {
2548 struct stat st;
2549 struct strbuf filename = STRBUF_INIT;
2550
2551 close(freq->localfile);
2552 freq->localfile = -1;
2553
2554 process_http_object_request(freq);
2555
2556 if (freq->http_code == 416) {
2557 warning("requested range invalid; we may already have all the data.");
2558 } else if (freq->curl_result != CURLE_OK) {
2559 if (stat(freq->tmpfile.buf, &st) == 0)
2560 if (st.st_size == 0)
2561 unlink_or_warn(freq->tmpfile.buf);
2562 return -1;
2563 }
2564
2565 git_inflate_end(&freq->stream);
2566 the_hash_algo->final_fn(freq->real_oid.hash, &freq->c);
2567 if (freq->zret != Z_STREAM_END) {
2568 unlink_or_warn(freq->tmpfile.buf);
2569 return -1;
2570 }
2571 if (!oideq(&freq->oid, &freq->real_oid)) {
2572 unlink_or_warn(freq->tmpfile.buf);
2573 return -1;
2574 }
2575 loose_object_path(the_repository, &filename, &freq->oid);
2576 freq->rename = finalize_object_file(freq->tmpfile.buf, filename.buf);
2577 strbuf_release(&filename);
2578
2579 return freq->rename;
2580 }
2581
2582 void abort_http_object_request(struct http_object_request *freq)
2583 {
2584 unlink_or_warn(freq->tmpfile.buf);
2585
2586 release_http_object_request(freq);
2587 }
2588
2589 void release_http_object_request(struct http_object_request *freq)
2590 {
2591 if (freq->localfile != -1) {
2592 close(freq->localfile);
2593 freq->localfile = -1;
2594 }
2595 FREE_AND_NULL(freq->url);
2596 if (freq->slot != NULL) {
2597 freq->slot->callback_func = NULL;
2598 freq->slot->callback_data = NULL;
2599 release_active_slot(freq->slot);
2600 freq->slot = NULL;
2601 }
2602 strbuf_release(&freq->tmpfile);
2603 }
git for Debian