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Merge branch 'gs/commit-graph-path-filter'
[alt-git.git] / http.c
blob62aa995245324dc30fec699ed8c570af7b152b8f
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 struct string_list cookies_to_redact = STRING_LIST_INIT_DUP;
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_IOCTL
190 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
191 {
192 struct buffer *buffer = clientp;
193
194 switch (cmd) {
195 case CURLIOCMD_NOP:
196 return CURLIOE_OK;
197
198 case CURLIOCMD_RESTARTREAD:
199 buffer->posn = 0;
200 return CURLIOE_OK;
201
202 default:
203 return CURLIOE_UNKNOWNCMD;
204 }
205 }
206 #endif
207
208 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
209 {
210 size_t size = eltsize * nmemb;
211 struct strbuf *buffer = buffer_;
212
213 strbuf_add(buffer, ptr, size);
214 return nmemb;
215 }
216
217 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
218 {
219 return nmemb;
220 }
221
222 static void closedown_active_slot(struct active_request_slot *slot)
223 {
224 active_requests--;
225 slot->in_use = 0;
226 }
227
228 static void finish_active_slot(struct active_request_slot *slot)
229 {
230 closedown_active_slot(slot);
231 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
232
233 if (slot->finished != NULL)
234 (*slot->finished) = 1;
235
236 /* Store slot results so they can be read after the slot is reused */
237 if (slot->results != NULL) {
238 slot->results->curl_result = slot->curl_result;
239 slot->results->http_code = slot->http_code;
240 #if LIBCURL_VERSION_NUM >= 0x070a08
241 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
242 &slot->results->auth_avail);
243 #else
244 slot->results->auth_avail = 0;
245 #endif
246
247 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
248 &slot->results->http_connectcode);
249 }
250
251 /* Run callback if appropriate */
252 if (slot->callback_func != NULL)
253 slot->callback_func(slot->callback_data);
254 }
255
256 static void xmulti_remove_handle(struct active_request_slot *slot)
257 {
258 #ifdef USE_CURL_MULTI
259 curl_multi_remove_handle(curlm, slot->curl);
260 #endif
261 }
262
263 #ifdef USE_CURL_MULTI
264 static void process_curl_messages(void)
265 {
266 int num_messages;
267 struct active_request_slot *slot;
268 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
269
270 while (curl_message != NULL) {
271 if (curl_message->msg == CURLMSG_DONE) {
272 int curl_result = curl_message->data.result;
273 slot = active_queue_head;
274 while (slot != NULL &&
275 slot->curl != curl_message->easy_handle)
276 slot = slot->next;
277 if (slot != NULL) {
278 xmulti_remove_handle(slot);
279 slot->curl_result = curl_result;
280 finish_active_slot(slot);
281 } else {
282 fprintf(stderr, "Received DONE message for unknown request!\n");
283 }
284 } else {
285 fprintf(stderr, "Unknown CURL message received: %d\n",
286 (int)curl_message->msg);
287 }
288 curl_message = curl_multi_info_read(curlm, &num_messages);
289 }
290 }
291 #endif
292
293 static int http_options(const char *var, const char *value, void *cb)
294 {
295 if (!strcmp("http.version", var)) {
296 return git_config_string(&curl_http_version, var, value);
297 }
298 if (!strcmp("http.sslverify", var)) {
299 curl_ssl_verify = git_config_bool(var, value);
300 return 0;
301 }
302 if (!strcmp("http.sslcipherlist", var))
303 return git_config_string(&ssl_cipherlist, var, value);
304 if (!strcmp("http.sslversion", var))
305 return git_config_string(&ssl_version, var, value);
306 if (!strcmp("http.sslcert", var))
307 return git_config_pathname(&ssl_cert, var, value);
308 #if LIBCURL_VERSION_NUM >= 0x070903
309 if (!strcmp("http.sslkey", var))
310 return git_config_pathname(&ssl_key, var, value);
311 #endif
312 #if LIBCURL_VERSION_NUM >= 0x070908
313 if (!strcmp("http.sslcapath", var))
314 return git_config_pathname(&ssl_capath, var, value);
315 #endif
316 if (!strcmp("http.sslcainfo", var))
317 return git_config_pathname(&ssl_cainfo, var, value);
318 if (!strcmp("http.sslcertpasswordprotected", var)) {
319 ssl_cert_password_required = git_config_bool(var, value);
320 return 0;
321 }
322 if (!strcmp("http.ssltry", var)) {
323 curl_ssl_try = git_config_bool(var, value);
324 return 0;
325 }
326 if (!strcmp("http.sslbackend", var)) {
327 free(http_ssl_backend);
328 http_ssl_backend = xstrdup_or_null(value);
329 return 0;
330 }
331
332 if (!strcmp("http.schannelcheckrevoke", var)) {
333 http_schannel_check_revoke = git_config_bool(var, value);
334 return 0;
335 }
336
337 if (!strcmp("http.schannelusesslcainfo", var)) {
338 http_schannel_use_ssl_cainfo = git_config_bool(var, value);
339 return 0;
340 }
341
342 if (!strcmp("http.minsessions", var)) {
343 min_curl_sessions = git_config_int(var, value);
344 #ifndef USE_CURL_MULTI
345 if (min_curl_sessions > 1)
346 min_curl_sessions = 1;
347 #endif
348 return 0;
349 }
350 #ifdef USE_CURL_MULTI
351 if (!strcmp("http.maxrequests", var)) {
352 max_requests = git_config_int(var, value);
353 return 0;
354 }
355 #endif
356 if (!strcmp("http.lowspeedlimit", var)) {
357 curl_low_speed_limit = (long)git_config_int(var, value);
358 return 0;
359 }
360 if (!strcmp("http.lowspeedtime", var)) {
361 curl_low_speed_time = (long)git_config_int(var, value);
362 return 0;
363 }
364
365 if (!strcmp("http.noepsv", var)) {
366 curl_ftp_no_epsv = git_config_bool(var, value);
367 return 0;
368 }
369 if (!strcmp("http.proxy", var))
370 return git_config_string(&curl_http_proxy, var, value);
371
372 if (!strcmp("http.proxyauthmethod", var))
373 return git_config_string(&http_proxy_authmethod, var, value);
374
375 if (!strcmp("http.proxysslcert", var))
376 return git_config_string(&http_proxy_ssl_cert, var, value);
377
378 if (!strcmp("http.proxysslkey", var))
379 return git_config_string(&http_proxy_ssl_key, var, value);
380
381 if (!strcmp("http.proxysslcainfo", var))
382 return git_config_string(&http_proxy_ssl_ca_info, var, value);
383
384 if (!strcmp("http.proxysslcertpasswordprotected", var)) {
385 proxy_ssl_cert_password_required = git_config_bool(var, value);
386 return 0;
387 }
388
389 if (!strcmp("http.cookiefile", var))
390 return git_config_pathname(&curl_cookie_file, var, value);
391 if (!strcmp("http.savecookies", var)) {
392 curl_save_cookies = git_config_bool(var, value);
393 return 0;
394 }
395
396 if (!strcmp("http.postbuffer", var)) {
397 http_post_buffer = git_config_ssize_t(var, value);
398 if (http_post_buffer < 0)
399 warning(_("negative value for http.postbuffer; defaulting to %d"), LARGE_PACKET_MAX);
400 if (http_post_buffer < LARGE_PACKET_MAX)
401 http_post_buffer = LARGE_PACKET_MAX;
402 return 0;
403 }
404
405 if (!strcmp("http.useragent", var))
406 return git_config_string(&user_agent, var, value);
407
408 if (!strcmp("http.emptyauth", var)) {
409 if (value && !strcmp("auto", value))
410 curl_empty_auth = -1;
411 else
412 curl_empty_auth = git_config_bool(var, value);
413 return 0;
414 }
415
416 if (!strcmp("http.delegation", var)) {
417 #ifdef CURLGSSAPI_DELEGATION_FLAG
418 return git_config_string(&curl_deleg, var, value);
419 #else
420 warning(_("Delegation control is not supported with cURL < 7.22.0"));
421 return 0;
422 #endif
423 }
424
425 if (!strcmp("http.pinnedpubkey", var)) {
426 #if LIBCURL_VERSION_NUM >= 0x072c00
427 return git_config_pathname(&ssl_pinnedkey, var, value);
428 #else
429 warning(_("Public key pinning not supported with cURL < 7.44.0"));
430 return 0;
431 #endif
432 }
433
434 if (!strcmp("http.extraheader", var)) {
435 if (!value) {
436 return config_error_nonbool(var);
437 } else if (!*value) {
438 string_list_clear(&extra_http_headers, 0);
439 } else {
440 string_list_append(&extra_http_headers, value);
441 }
442 return 0;
443 }
444
445 if (!strcmp("http.followredirects", var)) {
446 if (value && !strcmp(value, "initial"))
447 http_follow_config = HTTP_FOLLOW_INITIAL;
448 else if (git_config_bool(var, value))
449 http_follow_config = HTTP_FOLLOW_ALWAYS;
450 else
451 http_follow_config = HTTP_FOLLOW_NONE;
452 return 0;
453 }
454
455 /* Fall back on the default ones */
456 return git_default_config(var, value, cb);
457 }
458
459 static int curl_empty_auth_enabled(void)
460 {
461 if (curl_empty_auth >= 0)
462 return curl_empty_auth;
463
464 #ifndef LIBCURL_CAN_HANDLE_AUTH_ANY
465 /*
466 * Our libcurl is too old to do AUTH_ANY in the first place;
467 * just default to turning the feature off.
468 */
469 #else
470 /*
471 * In the automatic case, kick in the empty-auth
472 * hack as long as we would potentially try some
473 * method more exotic than "Basic" or "Digest".
474 *
475 * But only do this when this is our second or
476 * subsequent request, as by then we know what
477 * methods are available.
478 */
479 if (http_auth_methods_restricted &&
480 (http_auth_methods & ~empty_auth_useless))
481 return 1;
482 #endif
483 return 0;
484 }
485
486 static void init_curl_http_auth(CURL *result)
487 {
488 if (!http_auth.username || !*http_auth.username) {
489 if (curl_empty_auth_enabled())
490 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
491 return;
492 }
493
494 credential_fill(&http_auth);
495
496 #if LIBCURL_VERSION_NUM >= 0x071301
497 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
498 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
499 #else
500 {
501 static struct strbuf up = STRBUF_INIT;
502 /*
503 * Note that we assume we only ever have a single set of
504 * credentials in a given program run, so we do not have
505 * to worry about updating this buffer, only setting its
506 * initial value.
507 */
508 if (!up.len)
509 strbuf_addf(&up, "%s:%s",
510 http_auth.username, http_auth.password);
511 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
512 }
513 #endif
514 }
515
516 /* *var must be free-able */
517 static void var_override(const char **var, char *value)
518 {
519 if (value) {
520 free((void *)*var);
521 *var = xstrdup(value);
522 }
523 }
524
525 static void set_proxyauth_name_password(CURL *result)
526 {
527 #if LIBCURL_VERSION_NUM >= 0x071301
528 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
529 proxy_auth.username);
530 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
531 proxy_auth.password);
532 #else
533 struct strbuf s = STRBUF_INIT;
534
535 strbuf_addstr_urlencode(&s, proxy_auth.username,
536 is_rfc3986_unreserved);
537 strbuf_addch(&s, ':');
538 strbuf_addstr_urlencode(&s, proxy_auth.password,
539 is_rfc3986_unreserved);
540 curl_proxyuserpwd = strbuf_detach(&s, NULL);
541 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
542 #endif
543 }
544
545 static void init_curl_proxy_auth(CURL *result)
546 {
547 if (proxy_auth.username) {
548 if (!proxy_auth.password)
549 credential_fill(&proxy_auth);
550 set_proxyauth_name_password(result);
551 }
552
553 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
554
555 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
556 if (http_proxy_authmethod) {
557 int i;
558 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
559 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
560 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
561 proxy_authmethods[i].curlauth_param);
562 break;
563 }
564 }
565 if (i == ARRAY_SIZE(proxy_authmethods)) {
566 warning("unsupported proxy authentication method %s: using anyauth",
567 http_proxy_authmethod);
568 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
569 }
570 }
571 else
572 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
573 #endif
574 }
575
576 static int has_cert_password(void)
577 {
578 if (ssl_cert == NULL || ssl_cert_password_required != 1)
579 return 0;
580 if (!cert_auth.password) {
581 cert_auth.protocol = xstrdup("cert");
582 cert_auth.host = xstrdup("");
583 cert_auth.username = xstrdup("");
584 cert_auth.path = xstrdup(ssl_cert);
585 credential_fill(&cert_auth);
586 }
587 return 1;
588 }
589
590 #if LIBCURL_VERSION_NUM >= 0x073400
591 static int has_proxy_cert_password(void)
592 {
593 if (http_proxy_ssl_cert == NULL || proxy_ssl_cert_password_required != 1)
594 return 0;
595 if (!proxy_cert_auth.password) {
596 proxy_cert_auth.protocol = xstrdup("cert");
597 proxy_cert_auth.host = xstrdup("");
598 proxy_cert_auth.username = xstrdup("");
599 proxy_cert_auth.path = xstrdup(http_proxy_ssl_cert);
600 credential_fill(&proxy_cert_auth);
601 }
602 return 1;
603 }
604 #endif
605
606 #if LIBCURL_VERSION_NUM >= 0x071900
607 static void set_curl_keepalive(CURL *c)
608 {
609 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
610 }
611
612 #elif LIBCURL_VERSION_NUM >= 0x071000
613 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
614 {
615 int ka = 1;
616 int rc;
617 socklen_t len = (socklen_t)sizeof(ka);
618
619 if (type != CURLSOCKTYPE_IPCXN)
620 return 0;
621
622 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
623 if (rc < 0)
624 warning_errno("unable to set SO_KEEPALIVE on socket");
625
626 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
627 }
628
629 static void set_curl_keepalive(CURL *c)
630 {
631 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
632 }
633
634 #else
635 static void set_curl_keepalive(CURL *c)
636 {
637 /* not supported on older curl versions */
638 }
639 #endif
640
641 static void redact_sensitive_header(struct strbuf *header)
642 {
643 const char *sensitive_header;
644
645 if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
646 skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
647 /* The first token is the type, which is OK to log */
648 while (isspace(*sensitive_header))
649 sensitive_header++;
650 while (*sensitive_header && !isspace(*sensitive_header))
651 sensitive_header++;
652 /* Everything else is opaque and possibly sensitive */
653 strbuf_setlen(header, sensitive_header - header->buf);
654 strbuf_addstr(header, " <redacted>");
655 } else if (cookies_to_redact.nr &&
656 skip_prefix(header->buf, "Cookie:", &sensitive_header)) {
657 struct strbuf redacted_header = STRBUF_INIT;
658 char *cookie;
659
660 while (isspace(*sensitive_header))
661 sensitive_header++;
662
663 /*
664 * The contents of header starting from sensitive_header will
665 * subsequently be overridden, so it is fine to mutate this
666 * string (hence the assignment to "char *").
667 */
668 cookie = (char *) sensitive_header;
669
670 while (cookie) {
671 char *equals;
672 char *semicolon = strstr(cookie, "; ");
673 if (semicolon)
674 *semicolon = 0;
675 equals = strchrnul(cookie, '=');
676 if (!equals) {
677 /* invalid cookie, just append and continue */
678 strbuf_addstr(&redacted_header, cookie);
679 continue;
680 }
681 *equals = 0; /* temporarily set to NUL for lookup */
682 if (string_list_lookup(&cookies_to_redact, cookie)) {
683 strbuf_addstr(&redacted_header, cookie);
684 strbuf_addstr(&redacted_header, "=<redacted>");
685 } else {
686 *equals = '=';
687 strbuf_addstr(&redacted_header, cookie);
688 }
689 if (semicolon) {
690 /*
691 * There are more cookies. (Or, for some
692 * reason, the input string ends in "; ".)
693 */
694 strbuf_addstr(&redacted_header, "; ");
695 cookie = semicolon + strlen("; ");
696 } else {
697 cookie = NULL;
698 }
699 }
700
701 strbuf_setlen(header, sensitive_header - header->buf);
702 strbuf_addbuf(header, &redacted_header);
703 }
704 }
705
706 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
707 {
708 struct strbuf out = STRBUF_INIT;
709 struct strbuf **headers, **header;
710
711 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
712 text, (long)size, (long)size);
713 trace_strbuf(&trace_curl, &out);
714 strbuf_reset(&out);
715 strbuf_add(&out, ptr, size);
716 headers = strbuf_split_max(&out, '\n', 0);
717
718 for (header = headers; *header; header++) {
719 if (hide_sensitive_header)
720 redact_sensitive_header(*header);
721 strbuf_insertstr((*header), 0, text);
722 strbuf_insertstr((*header), strlen(text), ": ");
723 strbuf_rtrim((*header));
724 strbuf_addch((*header), '\n');
725 trace_strbuf(&trace_curl, (*header));
726 }
727 strbuf_list_free(headers);
728 strbuf_release(&out);
729 }
730
731 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
732 {
733 size_t i;
734 struct strbuf out = STRBUF_INIT;
735 unsigned int width = 60;
736
737 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
738 text, (long)size, (long)size);
739 trace_strbuf(&trace_curl, &out);
740
741 for (i = 0; i < size; i += width) {
742 size_t w;
743
744 strbuf_reset(&out);
745 strbuf_addf(&out, "%s: ", text);
746 for (w = 0; (w < width) && (i + w < size); w++) {
747 unsigned char ch = ptr[i + w];
748
749 strbuf_addch(&out,
750 (ch >= 0x20) && (ch < 0x80)
751 ? ch : '.');
752 }
753 strbuf_addch(&out, '\n');
754 trace_strbuf(&trace_curl, &out);
755 }
756 strbuf_release(&out);
757 }
758
759 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
760 {
761 const char *text;
762 enum { NO_FILTER = 0, DO_FILTER = 1 };
763
764 switch (type) {
765 case CURLINFO_TEXT:
766 trace_printf_key(&trace_curl, "== Info: %s", data);
767 break;
768 case CURLINFO_HEADER_OUT:
769 text = "=> Send header";
770 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
771 break;
772 case CURLINFO_DATA_OUT:
773 if (trace_curl_data) {
774 text = "=> Send data";
775 curl_dump_data(text, (unsigned char *)data, size);
776 }
777 break;
778 case CURLINFO_SSL_DATA_OUT:
779 if (trace_curl_data) {
780 text = "=> Send SSL data";
781 curl_dump_data(text, (unsigned char *)data, size);
782 }
783 break;
784 case CURLINFO_HEADER_IN:
785 text = "<= Recv header";
786 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
787 break;
788 case CURLINFO_DATA_IN:
789 if (trace_curl_data) {
790 text = "<= Recv data";
791 curl_dump_data(text, (unsigned char *)data, size);
792 }
793 break;
794 case CURLINFO_SSL_DATA_IN:
795 if (trace_curl_data) {
796 text = "<= Recv SSL data";
797 curl_dump_data(text, (unsigned char *)data, size);
798 }
799 break;
800
801 default: /* we ignore unknown types by default */
802 return 0;
803 }
804 return 0;
805 }
806
807 void setup_curl_trace(CURL *handle)
808 {
809 if (!trace_want(&trace_curl))
810 return;
811 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
812 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
813 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
814 }
815
816 #ifdef CURLPROTO_HTTP
817 static long get_curl_allowed_protocols(int from_user)
818 {
819 long allowed_protocols = 0;
820
821 if (is_transport_allowed("http", from_user))
822 allowed_protocols |= CURLPROTO_HTTP;
823 if (is_transport_allowed("https", from_user))
824 allowed_protocols |= CURLPROTO_HTTPS;
825 if (is_transport_allowed("ftp", from_user))
826 allowed_protocols |= CURLPROTO_FTP;
827 if (is_transport_allowed("ftps", from_user))
828 allowed_protocols |= CURLPROTO_FTPS;
829
830 return allowed_protocols;
831 }
832 #endif
833
834 #if LIBCURL_VERSION_NUM >=0x072f00
835 static int get_curl_http_version_opt(const char *version_string, long *opt)
836 {
837 int i;
838 static struct {
839 const char *name;
840 long opt_token;
841 } choice[] = {
842 { "HTTP/1.1", CURL_HTTP_VERSION_1_1 },
843 { "HTTP/2", CURL_HTTP_VERSION_2 }
844 };
845
846 for (i = 0; i < ARRAY_SIZE(choice); i++) {
847 if (!strcmp(version_string, choice[i].name)) {
848 *opt = choice[i].opt_token;
849 return 0;
850 }
851 }
852
853 warning("unknown value given to http.version: '%s'", version_string);
854 return -1; /* not found */
855 }
856
857 #endif
858
859 static CURL *get_curl_handle(void)
860 {
861 CURL *result = curl_easy_init();
862
863 if (!result)
864 die("curl_easy_init failed");
865
866 if (!curl_ssl_verify) {
867 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
868 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
869 } else {
870 /* Verify authenticity of the peer's certificate */
871 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
872 /* The name in the cert must match whom we tried to connect */
873 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
874 }
875
876 #if LIBCURL_VERSION_NUM >= 0x072f00 // 7.47.0
877 if (curl_http_version) {
878 long opt;
879 if (!get_curl_http_version_opt(curl_http_version, &opt)) {
880 /* Set request use http version */
881 curl_easy_setopt(result, CURLOPT_HTTP_VERSION, opt);
882 }
883 }
884 #endif
885
886 #if LIBCURL_VERSION_NUM >= 0x070907
887 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
888 #endif
889 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
890 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
891 #endif
892
893 #ifdef CURLGSSAPI_DELEGATION_FLAG
894 if (curl_deleg) {
895 int i;
896 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
897 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
898 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
899 curl_deleg_levels[i].curl_deleg_param);
900 break;
901 }
902 }
903 if (i == ARRAY_SIZE(curl_deleg_levels))
904 warning("Unknown delegation method '%s': using default",
905 curl_deleg);
906 }
907 #endif
908
909 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
910 !http_schannel_check_revoke) {
911 #if LIBCURL_VERSION_NUM >= 0x072c00
912 curl_easy_setopt(result, CURLOPT_SSL_OPTIONS, CURLSSLOPT_NO_REVOKE);
913 #else
914 warning(_("CURLSSLOPT_NO_REVOKE not supported with cURL < 7.44.0"));
915 #endif
916 }
917
918 if (http_proactive_auth)
919 init_curl_http_auth(result);
920
921 if (getenv("GIT_SSL_VERSION"))
922 ssl_version = getenv("GIT_SSL_VERSION");
923 if (ssl_version && *ssl_version) {
924 int i;
925 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
926 if (!strcmp(ssl_version, sslversions[i].name)) {
927 curl_easy_setopt(result, CURLOPT_SSLVERSION,
928 sslversions[i].ssl_version);
929 break;
930 }
931 }
932 if (i == ARRAY_SIZE(sslversions))
933 warning("unsupported ssl version %s: using default",
934 ssl_version);
935 }
936
937 if (getenv("GIT_SSL_CIPHER_LIST"))
938 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
939 if (ssl_cipherlist != NULL && *ssl_cipherlist)
940 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
941 ssl_cipherlist);
942
943 if (ssl_cert != NULL)
944 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
945 if (has_cert_password())
946 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
947 #if LIBCURL_VERSION_NUM >= 0x070903
948 if (ssl_key != NULL)
949 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
950 #endif
951 #if LIBCURL_VERSION_NUM >= 0x070908
952 if (ssl_capath != NULL)
953 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
954 #endif
955 #if LIBCURL_VERSION_NUM >= 0x072c00
956 if (ssl_pinnedkey != NULL)
957 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
958 #endif
959 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
960 !http_schannel_use_ssl_cainfo) {
961 curl_easy_setopt(result, CURLOPT_CAINFO, NULL);
962 #if LIBCURL_VERSION_NUM >= 0x073400
963 curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, NULL);
964 #endif
965 } else if (ssl_cainfo != NULL || http_proxy_ssl_ca_info != NULL) {
966 if (ssl_cainfo != NULL)
967 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
968 #if LIBCURL_VERSION_NUM >= 0x073400
969 if (http_proxy_ssl_ca_info != NULL)
970 curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, http_proxy_ssl_ca_info);
971 #endif
972 }
973
974 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
975 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
976 curl_low_speed_limit);
977 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
978 curl_low_speed_time);
979 }
980
981 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
982 #if LIBCURL_VERSION_NUM >= 0x071301
983 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
984 #elif LIBCURL_VERSION_NUM >= 0x071101
985 curl_easy_setopt(result, CURLOPT_POST301, 1);
986 #endif
987 #ifdef CURLPROTO_HTTP
988 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
989 get_curl_allowed_protocols(0));
990 curl_easy_setopt(result, CURLOPT_PROTOCOLS,
991 get_curl_allowed_protocols(-1));
992 #else
993 warning(_("Protocol restrictions not supported with cURL < 7.19.4"));
994 #endif
995 if (getenv("GIT_CURL_VERBOSE"))
996 curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
997 setup_curl_trace(result);
998 if (getenv("GIT_TRACE_CURL_NO_DATA"))
999 trace_curl_data = 0;
1000 if (getenv("GIT_REDACT_COOKIES")) {
1001 string_list_split(&cookies_to_redact,
1002 getenv("GIT_REDACT_COOKIES"), ',', -1);
1003 string_list_sort(&cookies_to_redact);
1004 }
1005
1006 curl_easy_setopt(result, CURLOPT_USERAGENT,
1007 user_agent ? user_agent : git_user_agent());
1008
1009 if (curl_ftp_no_epsv)
1010 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
1011
1012 #ifdef CURLOPT_USE_SSL
1013 if (curl_ssl_try)
1014 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
1015 #endif
1016
1017 /*
1018 * CURL also examines these variables as a fallback; but we need to query
1019 * them here in order to decide whether to prompt for missing password (cf.
1020 * init_curl_proxy_auth()).
1021 *
1022 * Unlike many other common environment variables, these are historically
1023 * lowercase only. It appears that CURL did not know this and implemented
1024 * only uppercase variants, which was later corrected to take both - with
1025 * the exception of http_proxy, which is lowercase only also in CURL. As
1026 * the lowercase versions are the historical quasi-standard, they take
1027 * precedence here, as in CURL.
1028 */
1029 if (!curl_http_proxy) {
1030 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
1031 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
1032 var_override(&curl_http_proxy, getenv("https_proxy"));
1033 } else {
1034 var_override(&curl_http_proxy, getenv("http_proxy"));
1035 }
1036 if (!curl_http_proxy) {
1037 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
1038 var_override(&curl_http_proxy, getenv("all_proxy"));
1039 }
1040 }
1041
1042 if (curl_http_proxy && curl_http_proxy[0] == '\0') {
1043 /*
1044 * Handle case with the empty http.proxy value here to keep
1045 * common code clean.
1046 * NB: empty option disables proxying at all.
1047 */
1048 curl_easy_setopt(result, CURLOPT_PROXY, "");
1049 } else if (curl_http_proxy) {
1050 #if LIBCURL_VERSION_NUM >= 0x071800
1051 if (starts_with(curl_http_proxy, "socks5h"))
1052 curl_easy_setopt(result,
1053 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
1054 else if (starts_with(curl_http_proxy, "socks5"))
1055 curl_easy_setopt(result,
1056 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
1057 else if (starts_with(curl_http_proxy, "socks4a"))
1058 curl_easy_setopt(result,
1059 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
1060 else if (starts_with(curl_http_proxy, "socks"))
1061 curl_easy_setopt(result,
1062 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
1063 #endif
1064 #if LIBCURL_VERSION_NUM >= 0x073400
1065 else if (starts_with(curl_http_proxy, "https")) {
1066 curl_easy_setopt(result, CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
1067
1068 if (http_proxy_ssl_cert)
1069 curl_easy_setopt(result, CURLOPT_PROXY_SSLCERT, http_proxy_ssl_cert);
1070
1071 if (http_proxy_ssl_key)
1072 curl_easy_setopt(result, CURLOPT_PROXY_SSLKEY, http_proxy_ssl_key);
1073
1074 if (has_proxy_cert_password())
1075 curl_easy_setopt(result, CURLOPT_PROXY_KEYPASSWD, proxy_cert_auth.password);
1076 }
1077 #endif
1078 if (strstr(curl_http_proxy, "://"))
1079 credential_from_url(&proxy_auth, curl_http_proxy);
1080 else {
1081 struct strbuf url = STRBUF_INIT;
1082 strbuf_addf(&url, "http://%s", curl_http_proxy);
1083 credential_from_url(&proxy_auth, url.buf);
1084 strbuf_release(&url);
1085 }
1086
1087 if (!proxy_auth.host)
1088 die("Invalid proxy URL '%s'", curl_http_proxy);
1089
1090 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
1091 #if LIBCURL_VERSION_NUM >= 0x071304
1092 var_override(&curl_no_proxy, getenv("NO_PROXY"));
1093 var_override(&curl_no_proxy, getenv("no_proxy"));
1094 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
1095 #endif
1096 }
1097 init_curl_proxy_auth(result);
1098
1099 set_curl_keepalive(result);
1100
1101 return result;
1102 }
1103
1104 static void set_from_env(const char **var, const char *envname)
1105 {
1106 const char *val = getenv(envname);
1107 if (val)
1108 *var = val;
1109 }
1110
1111 void http_init(struct remote *remote, const char *url, int proactive_auth)
1112 {
1113 char *low_speed_limit;
1114 char *low_speed_time;
1115 char *normalized_url;
1116 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
1117
1118 config.section = "http";
1119 config.key = NULL;
1120 config.collect_fn = http_options;
1121 config.cascade_fn = git_default_config;
1122 config.cb = NULL;
1123
1124 http_is_verbose = 0;
1125 normalized_url = url_normalize(url, &config.url);
1126
1127 git_config(urlmatch_config_entry, &config);
1128 free(normalized_url);
1129 string_list_clear(&config.vars, 1);
1130
1131 #if LIBCURL_VERSION_NUM >= 0x073800
1132 if (http_ssl_backend) {
1133 const curl_ssl_backend **backends;
1134 struct strbuf buf = STRBUF_INIT;
1135 int i;
1136
1137 switch (curl_global_sslset(-1, http_ssl_backend, &backends)) {
1138 case CURLSSLSET_UNKNOWN_BACKEND:
1139 strbuf_addf(&buf, _("Unsupported SSL backend '%s'. "
1140 "Supported SSL backends:"),
1141 http_ssl_backend);
1142 for (i = 0; backends[i]; i++)
1143 strbuf_addf(&buf, "\n\t%s", backends[i]->name);
1144 die("%s", buf.buf);
1145 case CURLSSLSET_NO_BACKENDS:
1146 die(_("Could not set SSL backend to '%s': "
1147 "cURL was built without SSL backends"),
1148 http_ssl_backend);
1149 case CURLSSLSET_TOO_LATE:
1150 die(_("Could not set SSL backend to '%s': already set"),
1151 http_ssl_backend);
1152 case CURLSSLSET_OK:
1153 break; /* Okay! */
1154 }
1155 }
1156 #endif
1157
1158 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1159 die("curl_global_init failed");
1160
1161 http_proactive_auth = proactive_auth;
1162
1163 if (remote && remote->http_proxy)
1164 curl_http_proxy = xstrdup(remote->http_proxy);
1165
1166 if (remote)
1167 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
1168
1169 pragma_header = curl_slist_append(http_copy_default_headers(),
1170 "Pragma: no-cache");
1171 no_pragma_header = curl_slist_append(http_copy_default_headers(),
1172 "Pragma:");
1173
1174 #ifdef USE_CURL_MULTI
1175 {
1176 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1177 if (http_max_requests != NULL)
1178 max_requests = atoi(http_max_requests);
1179 }
1180
1181 curlm = curl_multi_init();
1182 if (!curlm)
1183 die("curl_multi_init failed");
1184 #endif
1185
1186 if (getenv("GIT_SSL_NO_VERIFY"))
1187 curl_ssl_verify = 0;
1188
1189 set_from_env(&ssl_cert, "GIT_SSL_CERT");
1190 #if LIBCURL_VERSION_NUM >= 0x070903
1191 set_from_env(&ssl_key, "GIT_SSL_KEY");
1192 #endif
1193 #if LIBCURL_VERSION_NUM >= 0x070908
1194 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
1195 #endif
1196 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
1197
1198 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
1199
1200 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1201 if (low_speed_limit != NULL)
1202 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1203 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1204 if (low_speed_time != NULL)
1205 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1206
1207 if (curl_ssl_verify == -1)
1208 curl_ssl_verify = 1;
1209
1210 curl_session_count = 0;
1211 #ifdef USE_CURL_MULTI
1212 if (max_requests < 1)
1213 max_requests = DEFAULT_MAX_REQUESTS;
1214 #endif
1215
1216 set_from_env(&http_proxy_ssl_cert, "GIT_PROXY_SSL_CERT");
1217 set_from_env(&http_proxy_ssl_key, "GIT_PROXY_SSL_KEY");
1218 set_from_env(&http_proxy_ssl_ca_info, "GIT_PROXY_SSL_CAINFO");
1219
1220 if (getenv("GIT_PROXY_SSL_CERT_PASSWORD_PROTECTED"))
1221 proxy_ssl_cert_password_required = 1;
1222
1223 if (getenv("GIT_CURL_FTP_NO_EPSV"))
1224 curl_ftp_no_epsv = 1;
1225
1226 if (url) {
1227 credential_from_url(&http_auth, url);
1228 if (!ssl_cert_password_required &&
1229 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1230 starts_with(url, "https://"))
1231 ssl_cert_password_required = 1;
1232 }
1233
1234 #ifndef NO_CURL_EASY_DUPHANDLE
1235 curl_default = get_curl_handle();
1236 #endif
1237 }
1238
1239 void http_cleanup(void)
1240 {
1241 struct active_request_slot *slot = active_queue_head;
1242
1243 while (slot != NULL) {
1244 struct active_request_slot *next = slot->next;
1245 if (slot->curl != NULL) {
1246 xmulti_remove_handle(slot);
1247 curl_easy_cleanup(slot->curl);
1248 }
1249 free(slot);
1250 slot = next;
1251 }
1252 active_queue_head = NULL;
1253
1254 #ifndef NO_CURL_EASY_DUPHANDLE
1255 curl_easy_cleanup(curl_default);
1256 #endif
1257
1258 #ifdef USE_CURL_MULTI
1259 curl_multi_cleanup(curlm);
1260 #endif
1261 curl_global_cleanup();
1262
1263 string_list_clear(&extra_http_headers, 0);
1264
1265 curl_slist_free_all(pragma_header);
1266 pragma_header = NULL;
1267
1268 curl_slist_free_all(no_pragma_header);
1269 no_pragma_header = NULL;
1270
1271 if (curl_http_proxy) {
1272 free((void *)curl_http_proxy);
1273 curl_http_proxy = NULL;
1274 }
1275
1276 if (proxy_auth.password) {
1277 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1278 FREE_AND_NULL(proxy_auth.password);
1279 }
1280
1281 free((void *)curl_proxyuserpwd);
1282 curl_proxyuserpwd = NULL;
1283
1284 free((void *)http_proxy_authmethod);
1285 http_proxy_authmethod = NULL;
1286
1287 if (cert_auth.password != NULL) {
1288 memset(cert_auth.password, 0, strlen(cert_auth.password));
1289 FREE_AND_NULL(cert_auth.password);
1290 }
1291 ssl_cert_password_required = 0;
1292
1293 if (proxy_cert_auth.password != NULL) {
1294 memset(proxy_cert_auth.password, 0, strlen(proxy_cert_auth.password));
1295 FREE_AND_NULL(proxy_cert_auth.password);
1296 }
1297 proxy_ssl_cert_password_required = 0;
1298
1299 FREE_AND_NULL(cached_accept_language);
1300 }
1301
1302 struct active_request_slot *get_active_slot(void)
1303 {
1304 struct active_request_slot *slot = active_queue_head;
1305 struct active_request_slot *newslot;
1306
1307 #ifdef USE_CURL_MULTI
1308 int num_transfers;
1309
1310 /* Wait for a slot to open up if the queue is full */
1311 while (active_requests >= max_requests) {
1312 curl_multi_perform(curlm, &num_transfers);
1313 if (num_transfers < active_requests)
1314 process_curl_messages();
1315 }
1316 #endif
1317
1318 while (slot != NULL && slot->in_use)
1319 slot = slot->next;
1320
1321 if (slot == NULL) {
1322 newslot = xmalloc(sizeof(*newslot));
1323 newslot->curl = NULL;
1324 newslot->in_use = 0;
1325 newslot->next = NULL;
1326
1327 slot = active_queue_head;
1328 if (slot == NULL) {
1329 active_queue_head = newslot;
1330 } else {
1331 while (slot->next != NULL)
1332 slot = slot->next;
1333 slot->next = newslot;
1334 }
1335 slot = newslot;
1336 }
1337
1338 if (slot->curl == NULL) {
1339 #ifdef NO_CURL_EASY_DUPHANDLE
1340 slot->curl = get_curl_handle();
1341 #else
1342 slot->curl = curl_easy_duphandle(curl_default);
1343 #endif
1344 curl_session_count++;
1345 }
1346
1347 active_requests++;
1348 slot->in_use = 1;
1349 slot->results = NULL;
1350 slot->finished = NULL;
1351 slot->callback_data = NULL;
1352 slot->callback_func = NULL;
1353 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1354 if (curl_save_cookies)
1355 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1356 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1357 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1358 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1359 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1360 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1361 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1362 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1363 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1364 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1365 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1366
1367 /*
1368 * Default following to off unless "ALWAYS" is configured; this gives
1369 * callers a sane starting point, and they can tweak for individual
1370 * HTTP_FOLLOW_* cases themselves.
1371 */
1372 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1373 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1374 else
1375 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1376
1377 #if LIBCURL_VERSION_NUM >= 0x070a08
1378 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1379 #endif
1380 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1381 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1382 #endif
1383 if (http_auth.password || curl_empty_auth_enabled())
1384 init_curl_http_auth(slot->curl);
1385
1386 return slot;
1387 }
1388
1389 int start_active_slot(struct active_request_slot *slot)
1390 {
1391 #ifdef USE_CURL_MULTI
1392 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1393 int num_transfers;
1394
1395 if (curlm_result != CURLM_OK &&
1396 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1397 warning("curl_multi_add_handle failed: %s",
1398 curl_multi_strerror(curlm_result));
1399 active_requests--;
1400 slot->in_use = 0;
1401 return 0;
1402 }
1403
1404 /*
1405 * We know there must be something to do, since we just added
1406 * something.
1407 */
1408 curl_multi_perform(curlm, &num_transfers);
1409 #endif
1410 return 1;
1411 }
1412
1413 #ifdef USE_CURL_MULTI
1414 struct fill_chain {
1415 void *data;
1416 int (*fill)(void *);
1417 struct fill_chain *next;
1418 };
1419
1420 static struct fill_chain *fill_cfg;
1421
1422 void add_fill_function(void *data, int (*fill)(void *))
1423 {
1424 struct fill_chain *new_fill = xmalloc(sizeof(*new_fill));
1425 struct fill_chain **linkp = &fill_cfg;
1426 new_fill->data = data;
1427 new_fill->fill = fill;
1428 new_fill->next = NULL;
1429 while (*linkp)
1430 linkp = &(*linkp)->next;
1431 *linkp = new_fill;
1432 }
1433
1434 void fill_active_slots(void)
1435 {
1436 struct active_request_slot *slot = active_queue_head;
1437
1438 while (active_requests < max_requests) {
1439 struct fill_chain *fill;
1440 for (fill = fill_cfg; fill; fill = fill->next)
1441 if (fill->fill(fill->data))
1442 break;
1443
1444 if (!fill)
1445 break;
1446 }
1447
1448 while (slot != NULL) {
1449 if (!slot->in_use && slot->curl != NULL
1450 && curl_session_count > min_curl_sessions) {
1451 curl_easy_cleanup(slot->curl);
1452 slot->curl = NULL;
1453 curl_session_count--;
1454 }
1455 slot = slot->next;
1456 }
1457 }
1458
1459 void step_active_slots(void)
1460 {
1461 int num_transfers;
1462 CURLMcode curlm_result;
1463
1464 do {
1465 curlm_result = curl_multi_perform(curlm, &num_transfers);
1466 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1467 if (num_transfers < active_requests) {
1468 process_curl_messages();
1469 fill_active_slots();
1470 }
1471 }
1472 #endif
1473
1474 void run_active_slot(struct active_request_slot *slot)
1475 {
1476 #ifdef USE_CURL_MULTI
1477 fd_set readfds;
1478 fd_set writefds;
1479 fd_set excfds;
1480 int max_fd;
1481 struct timeval select_timeout;
1482 int finished = 0;
1483
1484 slot->finished = &finished;
1485 while (!finished) {
1486 step_active_slots();
1487
1488 if (slot->in_use) {
1489 #if LIBCURL_VERSION_NUM >= 0x070f04
1490 long curl_timeout;
1491 curl_multi_timeout(curlm, &curl_timeout);
1492 if (curl_timeout == 0) {
1493 continue;
1494 } else if (curl_timeout == -1) {
1495 select_timeout.tv_sec = 0;
1496 select_timeout.tv_usec = 50000;
1497 } else {
1498 select_timeout.tv_sec = curl_timeout / 1000;
1499 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1500 }
1501 #else
1502 select_timeout.tv_sec = 0;
1503 select_timeout.tv_usec = 50000;
1504 #endif
1505
1506 max_fd = -1;
1507 FD_ZERO(&readfds);
1508 FD_ZERO(&writefds);
1509 FD_ZERO(&excfds);
1510 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1511
1512 /*
1513 * It can happen that curl_multi_timeout returns a pathologically
1514 * long timeout when curl_multi_fdset returns no file descriptors
1515 * to read. See commit message for more details.
1516 */
1517 if (max_fd < 0 &&
1518 (select_timeout.tv_sec > 0 ||
1519 select_timeout.tv_usec > 50000)) {
1520 select_timeout.tv_sec = 0;
1521 select_timeout.tv_usec = 50000;
1522 }
1523
1524 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1525 }
1526 }
1527 #else
1528 while (slot->in_use) {
1529 slot->curl_result = curl_easy_perform(slot->curl);
1530 finish_active_slot(slot);
1531 }
1532 #endif
1533 }
1534
1535 static void release_active_slot(struct active_request_slot *slot)
1536 {
1537 closedown_active_slot(slot);
1538 if (slot->curl) {
1539 xmulti_remove_handle(slot);
1540 if (curl_session_count > min_curl_sessions) {
1541 curl_easy_cleanup(slot->curl);
1542 slot->curl = NULL;
1543 curl_session_count--;
1544 }
1545 }
1546 #ifdef USE_CURL_MULTI
1547 fill_active_slots();
1548 #endif
1549 }
1550
1551 void finish_all_active_slots(void)
1552 {
1553 struct active_request_slot *slot = active_queue_head;
1554
1555 while (slot != NULL)
1556 if (slot->in_use) {
1557 run_active_slot(slot);
1558 slot = active_queue_head;
1559 } else {
1560 slot = slot->next;
1561 }
1562 }
1563
1564 /* Helpers for modifying and creating URLs */
1565 static inline int needs_quote(int ch)
1566 {
1567 if (((ch >= 'A') && (ch <= 'Z'))
1568 || ((ch >= 'a') && (ch <= 'z'))
1569 || ((ch >= '0') && (ch <= '9'))
1570 || (ch == '/')
1571 || (ch == '-')
1572 || (ch == '.'))
1573 return 0;
1574 return 1;
1575 }
1576
1577 static char *quote_ref_url(const char *base, const char *ref)
1578 {
1579 struct strbuf buf = STRBUF_INIT;
1580 const char *cp;
1581 int ch;
1582
1583 end_url_with_slash(&buf, base);
1584
1585 for (cp = ref; (ch = *cp) != 0; cp++)
1586 if (needs_quote(ch))
1587 strbuf_addf(&buf, "%%%02x", ch);
1588 else
1589 strbuf_addch(&buf, *cp);
1590
1591 return strbuf_detach(&buf, NULL);
1592 }
1593
1594 void append_remote_object_url(struct strbuf *buf, const char *url,
1595 const char *hex,
1596 int only_two_digit_prefix)
1597 {
1598 end_url_with_slash(buf, url);
1599
1600 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1601 if (!only_two_digit_prefix)
1602 strbuf_addstr(buf, hex + 2);
1603 }
1604
1605 char *get_remote_object_url(const char *url, const char *hex,
1606 int only_two_digit_prefix)
1607 {
1608 struct strbuf buf = STRBUF_INIT;
1609 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1610 return strbuf_detach(&buf, NULL);
1611 }
1612
1613 void normalize_curl_result(CURLcode *result, long http_code,
1614 char *errorstr, size_t errorlen)
1615 {
1616 /*
1617 * If we see a failing http code with CURLE_OK, we have turned off
1618 * FAILONERROR (to keep the server's custom error response), and should
1619 * translate the code into failure here.
1620 *
1621 * Likewise, if we see a redirect (30x code), that means we turned off
1622 * redirect-following, and we should treat the result as an error.
1623 */
1624 if (*result == CURLE_OK && http_code >= 300) {
1625 *result = CURLE_HTTP_RETURNED_ERROR;
1626 /*
1627 * Normally curl will already have put the "reason phrase"
1628 * from the server into curl_errorstr; unfortunately without
1629 * FAILONERROR it is lost, so we can give only the numeric
1630 * status code.
1631 */
1632 xsnprintf(errorstr, errorlen,
1633 "The requested URL returned error: %ld",
1634 http_code);
1635 }
1636 }
1637
1638 static int handle_curl_result(struct slot_results *results)
1639 {
1640 normalize_curl_result(&results->curl_result, results->http_code,
1641 curl_errorstr, sizeof(curl_errorstr));
1642
1643 if (results->curl_result == CURLE_OK) {
1644 credential_approve(&http_auth);
1645 if (proxy_auth.password)
1646 credential_approve(&proxy_auth);
1647 return HTTP_OK;
1648 } else if (missing_target(results))
1649 return HTTP_MISSING_TARGET;
1650 else if (results->http_code == 401) {
1651 if (http_auth.username && http_auth.password) {
1652 credential_reject(&http_auth);
1653 return HTTP_NOAUTH;
1654 } else {
1655 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1656 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1657 if (results->auth_avail) {
1658 http_auth_methods &= results->auth_avail;
1659 http_auth_methods_restricted = 1;
1660 }
1661 #endif
1662 return HTTP_REAUTH;
1663 }
1664 } else {
1665 if (results->http_connectcode == 407)
1666 credential_reject(&proxy_auth);
1667 #if LIBCURL_VERSION_NUM >= 0x070c00
1668 if (!curl_errorstr[0])
1669 strlcpy(curl_errorstr,
1670 curl_easy_strerror(results->curl_result),
1671 sizeof(curl_errorstr));
1672 #endif
1673 return HTTP_ERROR;
1674 }
1675 }
1676
1677 int run_one_slot(struct active_request_slot *slot,
1678 struct slot_results *results)
1679 {
1680 slot->results = results;
1681 if (!start_active_slot(slot)) {
1682 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1683 "failed to start HTTP request");
1684 return HTTP_START_FAILED;
1685 }
1686
1687 run_active_slot(slot);
1688 return handle_curl_result(results);
1689 }
1690
1691 struct curl_slist *http_copy_default_headers(void)
1692 {
1693 struct curl_slist *headers = NULL;
1694 const struct string_list_item *item;
1695
1696 for_each_string_list_item(item, &extra_http_headers)
1697 headers = curl_slist_append(headers, item->string);
1698
1699 return headers;
1700 }
1701
1702 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1703 {
1704 char *ptr;
1705 CURLcode ret;
1706
1707 strbuf_reset(buf);
1708 ret = curl_easy_getinfo(curl, info, &ptr);
1709 if (!ret && ptr)
1710 strbuf_addstr(buf, ptr);
1711 return ret;
1712 }
1713
1714 /*
1715 * Check for and extract a content-type parameter. "raw"
1716 * should be positioned at the start of the potential
1717 * parameter, with any whitespace already removed.
1718 *
1719 * "name" is the name of the parameter. The value is appended
1720 * to "out".
1721 */
1722 static int extract_param(const char *raw, const char *name,
1723 struct strbuf *out)
1724 {
1725 size_t len = strlen(name);
1726
1727 if (strncasecmp(raw, name, len))
1728 return -1;
1729 raw += len;
1730
1731 if (*raw != '=')
1732 return -1;
1733 raw++;
1734
1735 while (*raw && !isspace(*raw) && *raw != ';')
1736 strbuf_addch(out, *raw++);
1737 return 0;
1738 }
1739
1740 /*
1741 * Extract a normalized version of the content type, with any
1742 * spaces suppressed, all letters lowercased, and no trailing ";"
1743 * or parameters.
1744 *
1745 * Note that we will silently remove even invalid whitespace. For
1746 * example, "text / plain" is specifically forbidden by RFC 2616,
1747 * but "text/plain" is the only reasonable output, and this keeps
1748 * our code simple.
1749 *
1750 * If the "charset" argument is not NULL, store the value of any
1751 * charset parameter there.
1752 *
1753 * Example:
1754 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1755 * "text / plain" -> "text/plain"
1756 */
1757 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1758 struct strbuf *charset)
1759 {
1760 const char *p;
1761
1762 strbuf_reset(type);
1763 strbuf_grow(type, raw->len);
1764 for (p = raw->buf; *p; p++) {
1765 if (isspace(*p))
1766 continue;
1767 if (*p == ';') {
1768 p++;
1769 break;
1770 }
1771 strbuf_addch(type, tolower(*p));
1772 }
1773
1774 if (!charset)
1775 return;
1776
1777 strbuf_reset(charset);
1778 while (*p) {
1779 while (isspace(*p) || *p == ';')
1780 p++;
1781 if (!extract_param(p, "charset", charset))
1782 return;
1783 while (*p && !isspace(*p))
1784 p++;
1785 }
1786
1787 if (!charset->len && starts_with(type->buf, "text/"))
1788 strbuf_addstr(charset, "ISO-8859-1");
1789 }
1790
1791 static void write_accept_language(struct strbuf *buf)
1792 {
1793 /*
1794 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1795 * that, q-value will be smaller than 0.001, the minimum q-value the
1796 * HTTP specification allows. See
1797 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1798 */
1799 const int MAX_DECIMAL_PLACES = 3;
1800 const int MAX_LANGUAGE_TAGS = 1000;
1801 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1802 char **language_tags = NULL;
1803 int num_langs = 0;
1804 const char *s = get_preferred_languages();
1805 int i;
1806 struct strbuf tag = STRBUF_INIT;
1807
1808 /* Don't add Accept-Language header if no language is preferred. */
1809 if (!s)
1810 return;
1811
1812 /*
1813 * Split the colon-separated string of preferred languages into
1814 * language_tags array.
1815 */
1816 do {
1817 /* collect language tag */
1818 for (; *s && (isalnum(*s) || *s == '_'); s++)
1819 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1820
1821 /* skip .codeset, @modifier and any other unnecessary parts */
1822 while (*s && *s != ':')
1823 s++;
1824
1825 if (tag.len) {
1826 num_langs++;
1827 REALLOC_ARRAY(language_tags, num_langs);
1828 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1829 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1830 break;
1831 }
1832 } while (*s++);
1833
1834 /* write Accept-Language header into buf */
1835 if (num_langs) {
1836 int last_buf_len = 0;
1837 int max_q;
1838 int decimal_places;
1839 char q_format[32];
1840
1841 /* add '*' */
1842 REALLOC_ARRAY(language_tags, num_langs + 1);
1843 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1844
1845 /* compute decimal_places */
1846 for (max_q = 1, decimal_places = 0;
1847 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1848 decimal_places++, max_q *= 10)
1849 ;
1850
1851 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1852
1853 strbuf_addstr(buf, "Accept-Language: ");
1854
1855 for (i = 0; i < num_langs; i++) {
1856 if (i > 0)
1857 strbuf_addstr(buf, ", ");
1858
1859 strbuf_addstr(buf, language_tags[i]);
1860
1861 if (i > 0)
1862 strbuf_addf(buf, q_format, max_q - i);
1863
1864 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1865 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1866 break;
1867 }
1868
1869 last_buf_len = buf->len;
1870 }
1871 }
1872
1873 /* free language tags -- last one is a static '*' */
1874 for (i = 0; i < num_langs - 1; i++)
1875 free(language_tags[i]);
1876 free(language_tags);
1877 }
1878
1879 /*
1880 * Get an Accept-Language header which indicates user's preferred languages.
1881 *
1882 * Examples:
1883 * LANGUAGE= -> ""
1884 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1885 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1886 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1887 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1888 * LANGUAGE= LANG=C -> ""
1889 */
1890 static const char *get_accept_language(void)
1891 {
1892 if (!cached_accept_language) {
1893 struct strbuf buf = STRBUF_INIT;
1894 write_accept_language(&buf);
1895 if (buf.len > 0)
1896 cached_accept_language = strbuf_detach(&buf, NULL);
1897 }
1898
1899 return cached_accept_language;
1900 }
1901
1902 static void http_opt_request_remainder(CURL *curl, off_t pos)
1903 {
1904 char buf[128];
1905 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1906 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1907 }
1908
1909 /* http_request() targets */
1910 #define HTTP_REQUEST_STRBUF 0
1911 #define HTTP_REQUEST_FILE 1
1912
1913 static int http_request(const char *url,
1914 void *result, int target,
1915 const struct http_get_options *options)
1916 {
1917 struct active_request_slot *slot;
1918 struct slot_results results;
1919 struct curl_slist *headers = http_copy_default_headers();
1920 struct strbuf buf = STRBUF_INIT;
1921 const char *accept_language;
1922 int ret;
1923
1924 slot = get_active_slot();
1925 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1926
1927 if (result == NULL) {
1928 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1929 } else {
1930 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1931 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1932
1933 if (target == HTTP_REQUEST_FILE) {
1934 off_t posn = ftello(result);
1935 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1936 fwrite);
1937 if (posn > 0)
1938 http_opt_request_remainder(slot->curl, posn);
1939 } else
1940 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1941 fwrite_buffer);
1942 }
1943
1944 accept_language = get_accept_language();
1945
1946 if (accept_language)
1947 headers = curl_slist_append(headers, accept_language);
1948
1949 strbuf_addstr(&buf, "Pragma:");
1950 if (options && options->no_cache)
1951 strbuf_addstr(&buf, " no-cache");
1952 if (options && options->initial_request &&
1953 http_follow_config == HTTP_FOLLOW_INITIAL)
1954 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1955
1956 headers = curl_slist_append(headers, buf.buf);
1957
1958 /* Add additional headers here */
1959 if (options && options->extra_headers) {
1960 const struct string_list_item *item;
1961 for_each_string_list_item(item, options->extra_headers) {
1962 headers = curl_slist_append(headers, item->string);
1963 }
1964 }
1965
1966 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1967 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1968 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1969 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1970
1971 ret = run_one_slot(slot, &results);
1972
1973 if (options && options->content_type) {
1974 struct strbuf raw = STRBUF_INIT;
1975 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1976 extract_content_type(&raw, options->content_type,
1977 options->charset);
1978 strbuf_release(&raw);
1979 }
1980
1981 if (options && options->effective_url)
1982 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1983 options->effective_url);
1984
1985 curl_slist_free_all(headers);
1986 strbuf_release(&buf);
1987
1988 return ret;
1989 }
1990
1991 /*
1992 * Update the "base" url to a more appropriate value, as deduced by
1993 * redirects seen when requesting a URL starting with "url".
1994 *
1995 * The "asked" parameter is a URL that we asked curl to access, and must begin
1996 * with "base".
1997 *
1998 * The "got" parameter is the URL that curl reported to us as where we ended
1999 * up.
2000 *
2001 * Returns 1 if we updated the base url, 0 otherwise.
2002 *
2003 * Our basic strategy is to compare "base" and "asked" to find the bits
2004 * specific to our request. We then strip those bits off of "got" to yield the
2005 * new base. So for example, if our base is "http://example.com/foo.git",
2006 * and we ask for "http://example.com/foo.git/info/refs", we might end up
2007 * with "https://other.example.com/foo.git/info/refs". We would want the
2008 * new URL to become "https://other.example.com/foo.git".
2009 *
2010 * Note that this assumes a sane redirect scheme. It's entirely possible
2011 * in the example above to end up at a URL that does not even end in
2012 * "info/refs". In such a case we die. There's not much we can do, such a
2013 * scheme is unlikely to represent a real git repository, and failing to
2014 * rewrite the base opens options for malicious redirects to do funny things.
2015 */
2016 static int update_url_from_redirect(struct strbuf *base,
2017 const char *asked,
2018 const struct strbuf *got)
2019 {
2020 const char *tail;
2021 size_t new_len;
2022
2023 if (!strcmp(asked, got->buf))
2024 return 0;
2025
2026 if (!skip_prefix(asked, base->buf, &tail))
2027 BUG("update_url_from_redirect: %s is not a superset of %s",
2028 asked, base->buf);
2029
2030 new_len = got->len;
2031 if (!strip_suffix_mem(got->buf, &new_len, tail))
2032 die(_("unable to update url base from redirection:\n"
2033 " asked for: %s\n"
2034 " redirect: %s"),
2035 asked, got->buf);
2036
2037 strbuf_reset(base);
2038 strbuf_add(base, got->buf, new_len);
2039
2040 return 1;
2041 }
2042
2043 static int http_request_reauth(const char *url,
2044 void *result, int target,
2045 struct http_get_options *options)
2046 {
2047 int ret = http_request(url, result, target, options);
2048
2049 if (ret != HTTP_OK && ret != HTTP_REAUTH)
2050 return ret;
2051
2052 if (options && options->effective_url && options->base_url) {
2053 if (update_url_from_redirect(options->base_url,
2054 url, options->effective_url)) {
2055 credential_from_url(&http_auth, options->base_url->buf);
2056 url = options->effective_url->buf;
2057 }
2058 }
2059
2060 if (ret != HTTP_REAUTH)
2061 return ret;
2062
2063 /*
2064 * The previous request may have put cruft into our output stream; we
2065 * should clear it out before making our next request.
2066 */
2067 switch (target) {
2068 case HTTP_REQUEST_STRBUF:
2069 strbuf_reset(result);
2070 break;
2071 case HTTP_REQUEST_FILE:
2072 if (fflush(result)) {
2073 error_errno("unable to flush a file");
2074 return HTTP_START_FAILED;
2075 }
2076 rewind(result);
2077 if (ftruncate(fileno(result), 0) < 0) {
2078 error_errno("unable to truncate a file");
2079 return HTTP_START_FAILED;
2080 }
2081 break;
2082 default:
2083 BUG("Unknown http_request target");
2084 }
2085
2086 credential_fill(&http_auth);
2087
2088 return http_request(url, result, target, options);
2089 }
2090
2091 int http_get_strbuf(const char *url,
2092 struct strbuf *result,
2093 struct http_get_options *options)
2094 {
2095 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
2096 }
2097
2098 /*
2099 * Downloads a URL and stores the result in the given file.
2100 *
2101 * If a previous interrupted download is detected (i.e. a previous temporary
2102 * file is still around) the download is resumed.
2103 */
2104 static int http_get_file(const char *url, const char *filename,
2105 struct http_get_options *options)
2106 {
2107 int ret;
2108 struct strbuf tmpfile = STRBUF_INIT;
2109 FILE *result;
2110
2111 strbuf_addf(&tmpfile, "%s.temp", filename);
2112 result = fopen(tmpfile.buf, "a");
2113 if (!result) {
2114 error("Unable to open local file %s", tmpfile.buf);
2115 ret = HTTP_ERROR;
2116 goto cleanup;
2117 }
2118
2119 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
2120 fclose(result);
2121
2122 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
2123 ret = HTTP_ERROR;
2124 cleanup:
2125 strbuf_release(&tmpfile);
2126 return ret;
2127 }
2128
2129 int http_fetch_ref(const char *base, struct ref *ref)
2130 {
2131 struct http_get_options options = {0};
2132 char *url;
2133 struct strbuf buffer = STRBUF_INIT;
2134 int ret = -1;
2135
2136 options.no_cache = 1;
2137
2138 url = quote_ref_url(base, ref->name);
2139 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
2140 strbuf_rtrim(&buffer);
2141 if (buffer.len == the_hash_algo->hexsz)
2142 ret = get_oid_hex(buffer.buf, &ref->old_oid);
2143 else if (starts_with(buffer.buf, "ref: ")) {
2144 ref->symref = xstrdup(buffer.buf + 5);
2145 ret = 0;
2146 }
2147 }
2148
2149 strbuf_release(&buffer);
2150 free(url);
2151 return ret;
2152 }
2153
2154 /* Helpers for fetching packs */
2155 static char *fetch_pack_index(unsigned char *hash, const char *base_url)
2156 {
2157 char *url, *tmp;
2158 struct strbuf buf = STRBUF_INIT;
2159
2160 if (http_is_verbose)
2161 fprintf(stderr, "Getting index for pack %s\n", hash_to_hex(hash));
2162
2163 end_url_with_slash(&buf, base_url);
2164 strbuf_addf(&buf, "objects/pack/pack-%s.idx", hash_to_hex(hash));
2165 url = strbuf_detach(&buf, NULL);
2166
2167 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(hash));
2168 tmp = strbuf_detach(&buf, NULL);
2169
2170 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
2171 error("Unable to get pack index %s", url);
2172 FREE_AND_NULL(tmp);
2173 }
2174
2175 free(url);
2176 return tmp;
2177 }
2178
2179 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
2180 unsigned char *sha1, const char *base_url)
2181 {
2182 struct packed_git *new_pack;
2183 char *tmp_idx = NULL;
2184 int ret;
2185
2186 if (has_pack_index(sha1)) {
2187 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
2188 if (!new_pack)
2189 return -1; /* parse_pack_index() already issued error message */
2190 goto add_pack;
2191 }
2192
2193 tmp_idx = fetch_pack_index(sha1, base_url);
2194 if (!tmp_idx)
2195 return -1;
2196
2197 new_pack = parse_pack_index(sha1, tmp_idx);
2198 if (!new_pack) {
2199 unlink(tmp_idx);
2200 free(tmp_idx);
2201
2202 return -1; /* parse_pack_index() already issued error message */
2203 }
2204
2205 ret = verify_pack_index(new_pack);
2206 if (!ret) {
2207 close_pack_index(new_pack);
2208 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
2209 }
2210 free(tmp_idx);
2211 if (ret)
2212 return -1;
2213
2214 add_pack:
2215 new_pack->next = *packs_head;
2216 *packs_head = new_pack;
2217 return 0;
2218 }
2219
2220 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
2221 {
2222 struct http_get_options options = {0};
2223 int ret = 0;
2224 char *url;
2225 const char *data;
2226 struct strbuf buf = STRBUF_INIT;
2227 struct object_id oid;
2228
2229 end_url_with_slash(&buf, base_url);
2230 strbuf_addstr(&buf, "objects/info/packs");
2231 url = strbuf_detach(&buf, NULL);
2232
2233 options.no_cache = 1;
2234 ret = http_get_strbuf(url, &buf, &options);
2235 if (ret != HTTP_OK)
2236 goto cleanup;
2237
2238 data = buf.buf;
2239 while (*data) {
2240 if (skip_prefix(data, "P pack-", &data) &&
2241 !parse_oid_hex(data, &oid, &data) &&
2242 skip_prefix(data, ".pack", &data) &&
2243 (*data == '\n' || *data == '\0')) {
2244 fetch_and_setup_pack_index(packs_head, oid.hash, base_url);
2245 } else {
2246 data = strchrnul(data, '\n');
2247 }
2248 if (*data)
2249 data++; /* skip past newline */
2250 }
2251
2252 cleanup:
2253 free(url);
2254 return ret;
2255 }
2256
2257 void release_http_pack_request(struct http_pack_request *preq)
2258 {
2259 if (preq->packfile != NULL) {
2260 fclose(preq->packfile);
2261 preq->packfile = NULL;
2262 }
2263 preq->slot = NULL;
2264 strbuf_release(&preq->tmpfile);
2265 free(preq->url);
2266 free(preq);
2267 }
2268
2269 int finish_http_pack_request(struct http_pack_request *preq)
2270 {
2271 struct packed_git **lst;
2272 struct packed_git *p = preq->target;
2273 char *tmp_idx;
2274 size_t len;
2275 struct child_process ip = CHILD_PROCESS_INIT;
2276
2277 close_pack_index(p);
2278
2279 fclose(preq->packfile);
2280 preq->packfile = NULL;
2281
2282 lst = preq->lst;
2283 while (*lst != p)
2284 lst = &((*lst)->next);
2285 *lst = (*lst)->next;
2286
2287 if (!strip_suffix(preq->tmpfile.buf, ".pack.temp", &len))
2288 BUG("pack tmpfile does not end in .pack.temp?");
2289 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile.buf);
2290
2291 argv_array_push(&ip.args, "index-pack");
2292 argv_array_pushl(&ip.args, "-o", tmp_idx, NULL);
2293 argv_array_push(&ip.args, preq->tmpfile.buf);
2294 ip.git_cmd = 1;
2295 ip.no_stdin = 1;
2296 ip.no_stdout = 1;
2297
2298 if (run_command(&ip)) {
2299 unlink(preq->tmpfile.buf);
2300 unlink(tmp_idx);
2301 free(tmp_idx);
2302 return -1;
2303 }
2304
2305 unlink(sha1_pack_index_name(p->hash));
2306
2307 if (finalize_object_file(preq->tmpfile.buf, sha1_pack_name(p->hash))
2308 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->hash))) {
2309 free(tmp_idx);
2310 return -1;
2311 }
2312
2313 install_packed_git(the_repository, p);
2314 free(tmp_idx);
2315 return 0;
2316 }
2317
2318 struct http_pack_request *new_http_pack_request(
2319 struct packed_git *target, const char *base_url)
2320 {
2321 off_t prev_posn = 0;
2322 struct strbuf buf = STRBUF_INIT;
2323 struct http_pack_request *preq;
2324
2325 preq = xcalloc(1, sizeof(*preq));
2326 strbuf_init(&preq->tmpfile, 0);
2327 preq->target = target;
2328
2329 end_url_with_slash(&buf, base_url);
2330 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2331 hash_to_hex(target->hash));
2332 preq->url = strbuf_detach(&buf, NULL);
2333
2334 strbuf_addf(&preq->tmpfile, "%s.temp", sha1_pack_name(target->hash));
2335 preq->packfile = fopen(preq->tmpfile.buf, "a");
2336 if (!preq->packfile) {
2337 error("Unable to open local file %s for pack",
2338 preq->tmpfile.buf);
2339 goto abort;
2340 }
2341
2342 preq->slot = get_active_slot();
2343 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2344 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2345 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2346 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2347 no_pragma_header);
2348
2349 /*
2350 * If there is data present from a previous transfer attempt,
2351 * resume where it left off
2352 */
2353 prev_posn = ftello(preq->packfile);
2354 if (prev_posn>0) {
2355 if (http_is_verbose)
2356 fprintf(stderr,
2357 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2358 hash_to_hex(target->hash),
2359 (uintmax_t)prev_posn);
2360 http_opt_request_remainder(preq->slot->curl, prev_posn);
2361 }
2362
2363 return preq;
2364
2365 abort:
2366 strbuf_release(&preq->tmpfile);
2367 free(preq->url);
2368 free(preq);
2369 return NULL;
2370 }
2371
2372 /* Helpers for fetching objects (loose) */
2373 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2374 void *data)
2375 {
2376 unsigned char expn[4096];
2377 size_t size = eltsize * nmemb;
2378 int posn = 0;
2379 struct http_object_request *freq = data;
2380 struct active_request_slot *slot = freq->slot;
2381
2382 if (slot) {
2383 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2384 &slot->http_code);
2385 if (c != CURLE_OK)
2386 BUG("curl_easy_getinfo for HTTP code failed: %s",
2387 curl_easy_strerror(c));
2388 if (slot->http_code >= 300)
2389 return nmemb;
2390 }
2391
2392 do {
2393 ssize_t retval = xwrite(freq->localfile,
2394 (char *) ptr + posn, size - posn);
2395 if (retval < 0)
2396 return posn / eltsize;
2397 posn += retval;
2398 } while (posn < size);
2399
2400 freq->stream.avail_in = size;
2401 freq->stream.next_in = (void *)ptr;
2402 do {
2403 freq->stream.next_out = expn;
2404 freq->stream.avail_out = sizeof(expn);
2405 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2406 the_hash_algo->update_fn(&freq->c, expn,
2407 sizeof(expn) - freq->stream.avail_out);
2408 } while (freq->stream.avail_in && freq->zret == Z_OK);
2409 return nmemb;
2410 }
2411
2412 struct http_object_request *new_http_object_request(const char *base_url,
2413 const struct object_id *oid)
2414 {
2415 char *hex = oid_to_hex(oid);
2416 struct strbuf filename = STRBUF_INIT;
2417 struct strbuf prevfile = STRBUF_INIT;
2418 int prevlocal;
2419 char prev_buf[PREV_BUF_SIZE];
2420 ssize_t prev_read = 0;
2421 off_t prev_posn = 0;
2422 struct http_object_request *freq;
2423
2424 freq = xcalloc(1, sizeof(*freq));
2425 strbuf_init(&freq->tmpfile, 0);
2426 oidcpy(&freq->oid, oid);
2427 freq->localfile = -1;
2428
2429 loose_object_path(the_repository, &filename, oid);
2430 strbuf_addf(&freq->tmpfile, "%s.temp", filename.buf);
2431
2432 strbuf_addf(&prevfile, "%s.prev", filename.buf);
2433 unlink_or_warn(prevfile.buf);
2434 rename(freq->tmpfile.buf, prevfile.buf);
2435 unlink_or_warn(freq->tmpfile.buf);
2436 strbuf_release(&filename);
2437
2438 if (freq->localfile != -1)
2439 error("fd leakage in start: %d", freq->localfile);
2440 freq->localfile = open(freq->tmpfile.buf,
2441 O_WRONLY | O_CREAT | O_EXCL, 0666);
2442 /*
2443 * This could have failed due to the "lazy directory creation";
2444 * try to mkdir the last path component.
2445 */
2446 if (freq->localfile < 0 && errno == ENOENT) {
2447 char *dir = strrchr(freq->tmpfile.buf, '/');
2448 if (dir) {
2449 *dir = 0;
2450 mkdir(freq->tmpfile.buf, 0777);
2451 *dir = '/';
2452 }
2453 freq->localfile = open(freq->tmpfile.buf,
2454 O_WRONLY | O_CREAT | O_EXCL, 0666);
2455 }
2456
2457 if (freq->localfile < 0) {
2458 error_errno("Couldn't create temporary file %s",
2459 freq->tmpfile.buf);
2460 goto abort;
2461 }
2462
2463 git_inflate_init(&freq->stream);
2464
2465 the_hash_algo->init_fn(&freq->c);
2466
2467 freq->url = get_remote_object_url(base_url, hex, 0);
2468
2469 /*
2470 * If a previous temp file is present, process what was already
2471 * fetched.
2472 */
2473 prevlocal = open(prevfile.buf, O_RDONLY);
2474 if (prevlocal != -1) {
2475 do {
2476 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2477 if (prev_read>0) {
2478 if (fwrite_sha1_file(prev_buf,
2479 1,
2480 prev_read,
2481 freq) == prev_read) {
2482 prev_posn += prev_read;
2483 } else {
2484 prev_read = -1;
2485 }
2486 }
2487 } while (prev_read > 0);
2488 close(prevlocal);
2489 }
2490 unlink_or_warn(prevfile.buf);
2491 strbuf_release(&prevfile);
2492
2493 /*
2494 * Reset inflate/SHA1 if there was an error reading the previous temp
2495 * file; also rewind to the beginning of the local file.
2496 */
2497 if (prev_read == -1) {
2498 memset(&freq->stream, 0, sizeof(freq->stream));
2499 git_inflate_init(&freq->stream);
2500 the_hash_algo->init_fn(&freq->c);
2501 if (prev_posn>0) {
2502 prev_posn = 0;
2503 lseek(freq->localfile, 0, SEEK_SET);
2504 if (ftruncate(freq->localfile, 0) < 0) {
2505 error_errno("Couldn't truncate temporary file %s",
2506 freq->tmpfile.buf);
2507 goto abort;
2508 }
2509 }
2510 }
2511
2512 freq->slot = get_active_slot();
2513
2514 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2515 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2516 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2517 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2518 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2519 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2520
2521 /*
2522 * If we have successfully processed data from a previous fetch
2523 * attempt, only fetch the data we don't already have.
2524 */
2525 if (prev_posn>0) {
2526 if (http_is_verbose)
2527 fprintf(stderr,
2528 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2529 hex, (uintmax_t)prev_posn);
2530 http_opt_request_remainder(freq->slot->curl, prev_posn);
2531 }
2532
2533 return freq;
2534
2535 abort:
2536 strbuf_release(&prevfile);
2537 free(freq->url);
2538 free(freq);
2539 return NULL;
2540 }
2541
2542 void process_http_object_request(struct http_object_request *freq)
2543 {
2544 if (freq->slot == NULL)
2545 return;
2546 freq->curl_result = freq->slot->curl_result;
2547 freq->http_code = freq->slot->http_code;
2548 freq->slot = NULL;
2549 }
2550
2551 int finish_http_object_request(struct http_object_request *freq)
2552 {
2553 struct stat st;
2554 struct strbuf filename = STRBUF_INIT;
2555
2556 close(freq->localfile);
2557 freq->localfile = -1;
2558
2559 process_http_object_request(freq);
2560
2561 if (freq->http_code == 416) {
2562 warning("requested range invalid; we may already have all the data.");
2563 } else if (freq->curl_result != CURLE_OK) {
2564 if (stat(freq->tmpfile.buf, &st) == 0)
2565 if (st.st_size == 0)
2566 unlink_or_warn(freq->tmpfile.buf);
2567 return -1;
2568 }
2569
2570 git_inflate_end(&freq->stream);
2571 the_hash_algo->final_fn(freq->real_oid.hash, &freq->c);
2572 if (freq->zret != Z_STREAM_END) {
2573 unlink_or_warn(freq->tmpfile.buf);
2574 return -1;
2575 }
2576 if (!oideq(&freq->oid, &freq->real_oid)) {
2577 unlink_or_warn(freq->tmpfile.buf);
2578 return -1;
2579 }
2580 loose_object_path(the_repository, &filename, &freq->oid);
2581 freq->rename = finalize_object_file(freq->tmpfile.buf, filename.buf);
2582 strbuf_release(&filename);
2583
2584 return freq->rename;
2585 }
2586
2587 void abort_http_object_request(struct http_object_request *freq)
2588 {
2589 unlink_or_warn(freq->tmpfile.buf);
2590
2591 release_http_object_request(freq);
2592 }
2593
2594 void release_http_object_request(struct http_object_request *freq)
2595 {
2596 if (freq->localfile != -1) {
2597 close(freq->localfile);
2598 freq->localfile = -1;
2599 }
2600 FREE_AND_NULL(freq->url);
2601 if (freq->slot != NULL) {
2602 freq->slot->callback_func = NULL;
2603 freq->slot->callback_data = NULL;
2604 release_active_slot(freq->slot);
2605 freq->slot = NULL;
2606 }
2607 strbuf_release(&freq->tmpfile);
2608 }
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