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docs: document credential.helper allowed values
[git/raj.git] / http.c
blob5f712634825ee7a9a10c344f889ca262f94f6407
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 static struct {
90 const char *name;
91 long curlauth_param;
92 } proxy_authmethods[] = {
93 { "basic", CURLAUTH_BASIC },
94 { "digest", CURLAUTH_DIGEST },
95 { "negotiate", CURLAUTH_GSSNEGOTIATE },
96 { "ntlm", CURLAUTH_NTLM },
97 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
98 { "anyauth", CURLAUTH_ANY },
99 #endif
100 /*
101 * CURLAUTH_DIGEST_IE has no corresponding command-line option in
102 * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
103 * here, too
104 */
105 };
106 #ifdef CURLGSSAPI_DELEGATION_FLAG
107 static const char *curl_deleg;
108 static struct {
109 const char *name;
110 long curl_deleg_param;
111 } curl_deleg_levels[] = {
112 { "none", CURLGSSAPI_DELEGATION_NONE },
113 { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
114 { "always", CURLGSSAPI_DELEGATION_FLAG },
115 };
116 #endif
117
118 static struct credential proxy_auth = CREDENTIAL_INIT;
119 static const char *curl_proxyuserpwd;
120 static const char *curl_cookie_file;
121 static int curl_save_cookies;
122 struct credential http_auth = CREDENTIAL_INIT;
123 static int http_proactive_auth;
124 static const char *user_agent;
125 static int curl_empty_auth = -1;
126
127 enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
128
129 #if LIBCURL_VERSION_NUM >= 0x071700
130 /* Use CURLOPT_KEYPASSWD as is */
131 #elif LIBCURL_VERSION_NUM >= 0x070903
132 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
133 #else
134 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
135 #endif
136
137 static struct credential cert_auth = CREDENTIAL_INIT;
138 static int ssl_cert_password_required;
139 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
140 static unsigned long http_auth_methods = CURLAUTH_ANY;
141 static int http_auth_methods_restricted;
142 /* Modes for which empty_auth cannot actually help us. */
143 static unsigned long empty_auth_useless =
144 CURLAUTH_BASIC
145 #ifdef CURLAUTH_DIGEST_IE
146 | CURLAUTH_DIGEST_IE
147 #endif
148 | CURLAUTH_DIGEST;
149 #endif
150
151 static struct curl_slist *pragma_header;
152 static struct curl_slist *no_pragma_header;
153 static struct string_list extra_http_headers = STRING_LIST_INIT_DUP;
154
155 static struct active_request_slot *active_queue_head;
156
157 static char *cached_accept_language;
158
159 static char *http_ssl_backend;
160
161 static int http_schannel_check_revoke = 1;
162 /*
163 * With the backend being set to `schannel`, setting sslCAinfo would override
164 * the Certificate Store in cURL v7.60.0 and later, which is not what we want
165 * by default.
166 */
167 static int http_schannel_use_ssl_cainfo;
168
169 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
170 {
171 size_t size = eltsize * nmemb;
172 struct buffer *buffer = buffer_;
173
174 if (size > buffer->buf.len - buffer->posn)
175 size = buffer->buf.len - buffer->posn;
176 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
177 buffer->posn += size;
178
179 return size / eltsize;
180 }
181
182 #ifndef NO_CURL_IOCTL
183 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
184 {
185 struct buffer *buffer = clientp;
186
187 switch (cmd) {
188 case CURLIOCMD_NOP:
189 return CURLIOE_OK;
190
191 case CURLIOCMD_RESTARTREAD:
192 buffer->posn = 0;
193 return CURLIOE_OK;
194
195 default:
196 return CURLIOE_UNKNOWNCMD;
197 }
198 }
199 #endif
200
201 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
202 {
203 size_t size = eltsize * nmemb;
204 struct strbuf *buffer = buffer_;
205
206 strbuf_add(buffer, ptr, size);
207 return nmemb;
208 }
209
210 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
211 {
212 return nmemb;
213 }
214
215 static void closedown_active_slot(struct active_request_slot *slot)
216 {
217 active_requests--;
218 slot->in_use = 0;
219 }
220
221 static void finish_active_slot(struct active_request_slot *slot)
222 {
223 closedown_active_slot(slot);
224 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
225
226 if (slot->finished != NULL)
227 (*slot->finished) = 1;
228
229 /* Store slot results so they can be read after the slot is reused */
230 if (slot->results != NULL) {
231 slot->results->curl_result = slot->curl_result;
232 slot->results->http_code = slot->http_code;
233 #if LIBCURL_VERSION_NUM >= 0x070a08
234 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
235 &slot->results->auth_avail);
236 #else
237 slot->results->auth_avail = 0;
238 #endif
239
240 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
241 &slot->results->http_connectcode);
242 }
243
244 /* Run callback if appropriate */
245 if (slot->callback_func != NULL)
246 slot->callback_func(slot->callback_data);
247 }
248
249 static void xmulti_remove_handle(struct active_request_slot *slot)
250 {
251 #ifdef USE_CURL_MULTI
252 curl_multi_remove_handle(curlm, slot->curl);
253 #endif
254 }
255
256 #ifdef USE_CURL_MULTI
257 static void process_curl_messages(void)
258 {
259 int num_messages;
260 struct active_request_slot *slot;
261 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
262
263 while (curl_message != NULL) {
264 if (curl_message->msg == CURLMSG_DONE) {
265 int curl_result = curl_message->data.result;
266 slot = active_queue_head;
267 while (slot != NULL &&
268 slot->curl != curl_message->easy_handle)
269 slot = slot->next;
270 if (slot != NULL) {
271 xmulti_remove_handle(slot);
272 slot->curl_result = curl_result;
273 finish_active_slot(slot);
274 } else {
275 fprintf(stderr, "Received DONE message for unknown request!\n");
276 }
277 } else {
278 fprintf(stderr, "Unknown CURL message received: %d\n",
279 (int)curl_message->msg);
280 }
281 curl_message = curl_multi_info_read(curlm, &num_messages);
282 }
283 }
284 #endif
285
286 static int http_options(const char *var, const char *value, void *cb)
287 {
288 if (!strcmp("http.version", var)) {
289 return git_config_string(&curl_http_version, var, value);
290 }
291 if (!strcmp("http.sslverify", var)) {
292 curl_ssl_verify = git_config_bool(var, value);
293 return 0;
294 }
295 if (!strcmp("http.sslcipherlist", var))
296 return git_config_string(&ssl_cipherlist, var, value);
297 if (!strcmp("http.sslversion", var))
298 return git_config_string(&ssl_version, var, value);
299 if (!strcmp("http.sslcert", var))
300 return git_config_pathname(&ssl_cert, var, value);
301 #if LIBCURL_VERSION_NUM >= 0x070903
302 if (!strcmp("http.sslkey", var))
303 return git_config_pathname(&ssl_key, var, value);
304 #endif
305 #if LIBCURL_VERSION_NUM >= 0x070908
306 if (!strcmp("http.sslcapath", var))
307 return git_config_pathname(&ssl_capath, var, value);
308 #endif
309 if (!strcmp("http.sslcainfo", var))
310 return git_config_pathname(&ssl_cainfo, var, value);
311 if (!strcmp("http.sslcertpasswordprotected", var)) {
312 ssl_cert_password_required = git_config_bool(var, value);
313 return 0;
314 }
315 if (!strcmp("http.ssltry", var)) {
316 curl_ssl_try = git_config_bool(var, value);
317 return 0;
318 }
319 if (!strcmp("http.sslbackend", var)) {
320 free(http_ssl_backend);
321 http_ssl_backend = xstrdup_or_null(value);
322 return 0;
323 }
324
325 if (!strcmp("http.schannelcheckrevoke", var)) {
326 http_schannel_check_revoke = git_config_bool(var, value);
327 return 0;
328 }
329
330 if (!strcmp("http.schannelusesslcainfo", var)) {
331 http_schannel_use_ssl_cainfo = git_config_bool(var, value);
332 return 0;
333 }
334
335 if (!strcmp("http.minsessions", var)) {
336 min_curl_sessions = git_config_int(var, value);
337 #ifndef USE_CURL_MULTI
338 if (min_curl_sessions > 1)
339 min_curl_sessions = 1;
340 #endif
341 return 0;
342 }
343 #ifdef USE_CURL_MULTI
344 if (!strcmp("http.maxrequests", var)) {
345 max_requests = git_config_int(var, value);
346 return 0;
347 }
348 #endif
349 if (!strcmp("http.lowspeedlimit", var)) {
350 curl_low_speed_limit = (long)git_config_int(var, value);
351 return 0;
352 }
353 if (!strcmp("http.lowspeedtime", var)) {
354 curl_low_speed_time = (long)git_config_int(var, value);
355 return 0;
356 }
357
358 if (!strcmp("http.noepsv", var)) {
359 curl_ftp_no_epsv = git_config_bool(var, value);
360 return 0;
361 }
362 if (!strcmp("http.proxy", var))
363 return git_config_string(&curl_http_proxy, var, value);
364
365 if (!strcmp("http.proxyauthmethod", var))
366 return git_config_string(&http_proxy_authmethod, var, value);
367
368 if (!strcmp("http.cookiefile", var))
369 return git_config_pathname(&curl_cookie_file, var, value);
370 if (!strcmp("http.savecookies", var)) {
371 curl_save_cookies = git_config_bool(var, value);
372 return 0;
373 }
374
375 if (!strcmp("http.postbuffer", var)) {
376 http_post_buffer = git_config_ssize_t(var, value);
377 if (http_post_buffer < 0)
378 warning(_("negative value for http.postbuffer; defaulting to %d"), LARGE_PACKET_MAX);
379 if (http_post_buffer < LARGE_PACKET_MAX)
380 http_post_buffer = LARGE_PACKET_MAX;
381 return 0;
382 }
383
384 if (!strcmp("http.useragent", var))
385 return git_config_string(&user_agent, var, value);
386
387 if (!strcmp("http.emptyauth", var)) {
388 if (value && !strcmp("auto", value))
389 curl_empty_auth = -1;
390 else
391 curl_empty_auth = git_config_bool(var, value);
392 return 0;
393 }
394
395 if (!strcmp("http.delegation", var)) {
396 #ifdef CURLGSSAPI_DELEGATION_FLAG
397 return git_config_string(&curl_deleg, var, value);
398 #else
399 warning(_("Delegation control is not supported with cURL < 7.22.0"));
400 return 0;
401 #endif
402 }
403
404 if (!strcmp("http.pinnedpubkey", var)) {
405 #if LIBCURL_VERSION_NUM >= 0x072c00
406 return git_config_pathname(&ssl_pinnedkey, var, value);
407 #else
408 warning(_("Public key pinning not supported with cURL < 7.44.0"));
409 return 0;
410 #endif
411 }
412
413 if (!strcmp("http.extraheader", var)) {
414 if (!value) {
415 return config_error_nonbool(var);
416 } else if (!*value) {
417 string_list_clear(&extra_http_headers, 0);
418 } else {
419 string_list_append(&extra_http_headers, value);
420 }
421 return 0;
422 }
423
424 if (!strcmp("http.followredirects", var)) {
425 if (value && !strcmp(value, "initial"))
426 http_follow_config = HTTP_FOLLOW_INITIAL;
427 else if (git_config_bool(var, value))
428 http_follow_config = HTTP_FOLLOW_ALWAYS;
429 else
430 http_follow_config = HTTP_FOLLOW_NONE;
431 return 0;
432 }
433
434 /* Fall back on the default ones */
435 return git_default_config(var, value, cb);
436 }
437
438 static int curl_empty_auth_enabled(void)
439 {
440 if (curl_empty_auth >= 0)
441 return curl_empty_auth;
442
443 #ifndef LIBCURL_CAN_HANDLE_AUTH_ANY
444 /*
445 * Our libcurl is too old to do AUTH_ANY in the first place;
446 * just default to turning the feature off.
447 */
448 #else
449 /*
450 * In the automatic case, kick in the empty-auth
451 * hack as long as we would potentially try some
452 * method more exotic than "Basic" or "Digest".
453 *
454 * But only do this when this is our second or
455 * subsequent request, as by then we know what
456 * methods are available.
457 */
458 if (http_auth_methods_restricted &&
459 (http_auth_methods & ~empty_auth_useless))
460 return 1;
461 #endif
462 return 0;
463 }
464
465 static void init_curl_http_auth(CURL *result)
466 {
467 if (!http_auth.username || !*http_auth.username) {
468 if (curl_empty_auth_enabled())
469 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
470 return;
471 }
472
473 credential_fill(&http_auth);
474
475 #if LIBCURL_VERSION_NUM >= 0x071301
476 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
477 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
478 #else
479 {
480 static struct strbuf up = STRBUF_INIT;
481 /*
482 * Note that we assume we only ever have a single set of
483 * credentials in a given program run, so we do not have
484 * to worry about updating this buffer, only setting its
485 * initial value.
486 */
487 if (!up.len)
488 strbuf_addf(&up, "%s:%s",
489 http_auth.username, http_auth.password);
490 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
491 }
492 #endif
493 }
494
495 /* *var must be free-able */
496 static void var_override(const char **var, char *value)
497 {
498 if (value) {
499 free((void *)*var);
500 *var = xstrdup(value);
501 }
502 }
503
504 static void set_proxyauth_name_password(CURL *result)
505 {
506 #if LIBCURL_VERSION_NUM >= 0x071301
507 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
508 proxy_auth.username);
509 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
510 proxy_auth.password);
511 #else
512 struct strbuf s = STRBUF_INIT;
513
514 strbuf_addstr_urlencode(&s, proxy_auth.username,
515 is_rfc3986_unreserved);
516 strbuf_addch(&s, ':');
517 strbuf_addstr_urlencode(&s, proxy_auth.password,
518 is_rfc3986_unreserved);
519 curl_proxyuserpwd = strbuf_detach(&s, NULL);
520 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
521 #endif
522 }
523
524 static void init_curl_proxy_auth(CURL *result)
525 {
526 if (proxy_auth.username) {
527 if (!proxy_auth.password)
528 credential_fill(&proxy_auth);
529 set_proxyauth_name_password(result);
530 }
531
532 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
533
534 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
535 if (http_proxy_authmethod) {
536 int i;
537 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
538 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
539 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
540 proxy_authmethods[i].curlauth_param);
541 break;
542 }
543 }
544 if (i == ARRAY_SIZE(proxy_authmethods)) {
545 warning("unsupported proxy authentication method %s: using anyauth",
546 http_proxy_authmethod);
547 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
548 }
549 }
550 else
551 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
552 #endif
553 }
554
555 static int has_cert_password(void)
556 {
557 if (ssl_cert == NULL || ssl_cert_password_required != 1)
558 return 0;
559 if (!cert_auth.password) {
560 cert_auth.protocol = xstrdup("cert");
561 cert_auth.host = xstrdup("");
562 cert_auth.username = xstrdup("");
563 cert_auth.path = xstrdup(ssl_cert);
564 credential_fill(&cert_auth);
565 }
566 return 1;
567 }
568
569 #if LIBCURL_VERSION_NUM >= 0x071900
570 static void set_curl_keepalive(CURL *c)
571 {
572 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
573 }
574
575 #elif LIBCURL_VERSION_NUM >= 0x071000
576 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
577 {
578 int ka = 1;
579 int rc;
580 socklen_t len = (socklen_t)sizeof(ka);
581
582 if (type != CURLSOCKTYPE_IPCXN)
583 return 0;
584
585 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
586 if (rc < 0)
587 warning_errno("unable to set SO_KEEPALIVE on socket");
588
589 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
590 }
591
592 static void set_curl_keepalive(CURL *c)
593 {
594 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
595 }
596
597 #else
598 static void set_curl_keepalive(CURL *c)
599 {
600 /* not supported on older curl versions */
601 }
602 #endif
603
604 static void redact_sensitive_header(struct strbuf *header)
605 {
606 const char *sensitive_header;
607
608 if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
609 skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
610 /* The first token is the type, which is OK to log */
611 while (isspace(*sensitive_header))
612 sensitive_header++;
613 while (*sensitive_header && !isspace(*sensitive_header))
614 sensitive_header++;
615 /* Everything else is opaque and possibly sensitive */
616 strbuf_setlen(header, sensitive_header - header->buf);
617 strbuf_addstr(header, " <redacted>");
618 } else if (cookies_to_redact.nr &&
619 skip_prefix(header->buf, "Cookie:", &sensitive_header)) {
620 struct strbuf redacted_header = STRBUF_INIT;
621 char *cookie;
622
623 while (isspace(*sensitive_header))
624 sensitive_header++;
625
626 /*
627 * The contents of header starting from sensitive_header will
628 * subsequently be overridden, so it is fine to mutate this
629 * string (hence the assignment to "char *").
630 */
631 cookie = (char *) sensitive_header;
632
633 while (cookie) {
634 char *equals;
635 char *semicolon = strstr(cookie, "; ");
636 if (semicolon)
637 *semicolon = 0;
638 equals = strchrnul(cookie, '=');
639 if (!equals) {
640 /* invalid cookie, just append and continue */
641 strbuf_addstr(&redacted_header, cookie);
642 continue;
643 }
644 *equals = 0; /* temporarily set to NUL for lookup */
645 if (string_list_lookup(&cookies_to_redact, cookie)) {
646 strbuf_addstr(&redacted_header, cookie);
647 strbuf_addstr(&redacted_header, "=<redacted>");
648 } else {
649 *equals = '=';
650 strbuf_addstr(&redacted_header, cookie);
651 }
652 if (semicolon) {
653 /*
654 * There are more cookies. (Or, for some
655 * reason, the input string ends in "; ".)
656 */
657 strbuf_addstr(&redacted_header, "; ");
658 cookie = semicolon + strlen("; ");
659 } else {
660 cookie = NULL;
661 }
662 }
663
664 strbuf_setlen(header, sensitive_header - header->buf);
665 strbuf_addbuf(header, &redacted_header);
666 }
667 }
668
669 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
670 {
671 struct strbuf out = STRBUF_INIT;
672 struct strbuf **headers, **header;
673
674 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
675 text, (long)size, (long)size);
676 trace_strbuf(&trace_curl, &out);
677 strbuf_reset(&out);
678 strbuf_add(&out, ptr, size);
679 headers = strbuf_split_max(&out, '\n', 0);
680
681 for (header = headers; *header; header++) {
682 if (hide_sensitive_header)
683 redact_sensitive_header(*header);
684 strbuf_insertstr((*header), 0, text);
685 strbuf_insertstr((*header), strlen(text), ": ");
686 strbuf_rtrim((*header));
687 strbuf_addch((*header), '\n');
688 trace_strbuf(&trace_curl, (*header));
689 }
690 strbuf_list_free(headers);
691 strbuf_release(&out);
692 }
693
694 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
695 {
696 size_t i;
697 struct strbuf out = STRBUF_INIT;
698 unsigned int width = 60;
699
700 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
701 text, (long)size, (long)size);
702 trace_strbuf(&trace_curl, &out);
703
704 for (i = 0; i < size; i += width) {
705 size_t w;
706
707 strbuf_reset(&out);
708 strbuf_addf(&out, "%s: ", text);
709 for (w = 0; (w < width) && (i + w < size); w++) {
710 unsigned char ch = ptr[i + w];
711
712 strbuf_addch(&out,
713 (ch >= 0x20) && (ch < 0x80)
714 ? ch : '.');
715 }
716 strbuf_addch(&out, '\n');
717 trace_strbuf(&trace_curl, &out);
718 }
719 strbuf_release(&out);
720 }
721
722 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
723 {
724 const char *text;
725 enum { NO_FILTER = 0, DO_FILTER = 1 };
726
727 switch (type) {
728 case CURLINFO_TEXT:
729 trace_printf_key(&trace_curl, "== Info: %s", data);
730 break;
731 case CURLINFO_HEADER_OUT:
732 text = "=> Send header";
733 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
734 break;
735 case CURLINFO_DATA_OUT:
736 if (trace_curl_data) {
737 text = "=> Send data";
738 curl_dump_data(text, (unsigned char *)data, size);
739 }
740 break;
741 case CURLINFO_SSL_DATA_OUT:
742 if (trace_curl_data) {
743 text = "=> Send SSL data";
744 curl_dump_data(text, (unsigned char *)data, size);
745 }
746 break;
747 case CURLINFO_HEADER_IN:
748 text = "<= Recv header";
749 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
750 break;
751 case CURLINFO_DATA_IN:
752 if (trace_curl_data) {
753 text = "<= Recv data";
754 curl_dump_data(text, (unsigned char *)data, size);
755 }
756 break;
757 case CURLINFO_SSL_DATA_IN:
758 if (trace_curl_data) {
759 text = "<= Recv SSL data";
760 curl_dump_data(text, (unsigned char *)data, size);
761 }
762 break;
763
764 default: /* we ignore unknown types by default */
765 return 0;
766 }
767 return 0;
768 }
769
770 void setup_curl_trace(CURL *handle)
771 {
772 if (!trace_want(&trace_curl))
773 return;
774 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
775 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
776 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
777 }
778
779 #ifdef CURLPROTO_HTTP
780 static long get_curl_allowed_protocols(int from_user)
781 {
782 long allowed_protocols = 0;
783
784 if (is_transport_allowed("http", from_user))
785 allowed_protocols |= CURLPROTO_HTTP;
786 if (is_transport_allowed("https", from_user))
787 allowed_protocols |= CURLPROTO_HTTPS;
788 if (is_transport_allowed("ftp", from_user))
789 allowed_protocols |= CURLPROTO_FTP;
790 if (is_transport_allowed("ftps", from_user))
791 allowed_protocols |= CURLPROTO_FTPS;
792
793 return allowed_protocols;
794 }
795 #endif
796
797 #if LIBCURL_VERSION_NUM >=0x072f00
798 static int get_curl_http_version_opt(const char *version_string, long *opt)
799 {
800 int i;
801 static struct {
802 const char *name;
803 long opt_token;
804 } choice[] = {
805 { "HTTP/1.1", CURL_HTTP_VERSION_1_1 },
806 { "HTTP/2", CURL_HTTP_VERSION_2 }
807 };
808
809 for (i = 0; i < ARRAY_SIZE(choice); i++) {
810 if (!strcmp(version_string, choice[i].name)) {
811 *opt = choice[i].opt_token;
812 return 0;
813 }
814 }
815
816 warning("unknown value given to http.version: '%s'", version_string);
817 return -1; /* not found */
818 }
819
820 #endif
821
822 static CURL *get_curl_handle(void)
823 {
824 CURL *result = curl_easy_init();
825
826 if (!result)
827 die("curl_easy_init failed");
828
829 if (!curl_ssl_verify) {
830 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
831 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
832 } else {
833 /* Verify authenticity of the peer's certificate */
834 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
835 /* The name in the cert must match whom we tried to connect */
836 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
837 }
838
839 #if LIBCURL_VERSION_NUM >= 0x072f00 // 7.47.0
840 if (curl_http_version) {
841 long opt;
842 if (!get_curl_http_version_opt(curl_http_version, &opt)) {
843 /* Set request use http version */
844 curl_easy_setopt(result, CURLOPT_HTTP_VERSION, opt);
845 }
846 }
847 #endif
848
849 #if LIBCURL_VERSION_NUM >= 0x070907
850 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
851 #endif
852 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
853 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
854 #endif
855
856 #ifdef CURLGSSAPI_DELEGATION_FLAG
857 if (curl_deleg) {
858 int i;
859 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
860 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
861 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
862 curl_deleg_levels[i].curl_deleg_param);
863 break;
864 }
865 }
866 if (i == ARRAY_SIZE(curl_deleg_levels))
867 warning("Unknown delegation method '%s': using default",
868 curl_deleg);
869 }
870 #endif
871
872 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
873 !http_schannel_check_revoke) {
874 #if LIBCURL_VERSION_NUM >= 0x072c00
875 curl_easy_setopt(result, CURLOPT_SSL_OPTIONS, CURLSSLOPT_NO_REVOKE);
876 #else
877 warning(_("CURLSSLOPT_NO_REVOKE not supported with cURL < 7.44.0"));
878 #endif
879 }
880
881 if (http_proactive_auth)
882 init_curl_http_auth(result);
883
884 if (getenv("GIT_SSL_VERSION"))
885 ssl_version = getenv("GIT_SSL_VERSION");
886 if (ssl_version && *ssl_version) {
887 int i;
888 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
889 if (!strcmp(ssl_version, sslversions[i].name)) {
890 curl_easy_setopt(result, CURLOPT_SSLVERSION,
891 sslversions[i].ssl_version);
892 break;
893 }
894 }
895 if (i == ARRAY_SIZE(sslversions))
896 warning("unsupported ssl version %s: using default",
897 ssl_version);
898 }
899
900 if (getenv("GIT_SSL_CIPHER_LIST"))
901 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
902 if (ssl_cipherlist != NULL && *ssl_cipherlist)
903 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
904 ssl_cipherlist);
905
906 if (ssl_cert != NULL)
907 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
908 if (has_cert_password())
909 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
910 #if LIBCURL_VERSION_NUM >= 0x070903
911 if (ssl_key != NULL)
912 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
913 #endif
914 #if LIBCURL_VERSION_NUM >= 0x070908
915 if (ssl_capath != NULL)
916 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
917 #endif
918 #if LIBCURL_VERSION_NUM >= 0x072c00
919 if (ssl_pinnedkey != NULL)
920 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
921 #endif
922 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
923 !http_schannel_use_ssl_cainfo) {
924 curl_easy_setopt(result, CURLOPT_CAINFO, NULL);
925 #if LIBCURL_VERSION_NUM >= 0x073400
926 curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, NULL);
927 #endif
928 } else if (ssl_cainfo != NULL)
929 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
930
931 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
932 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
933 curl_low_speed_limit);
934 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
935 curl_low_speed_time);
936 }
937
938 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
939 #if LIBCURL_VERSION_NUM >= 0x071301
940 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
941 #elif LIBCURL_VERSION_NUM >= 0x071101
942 curl_easy_setopt(result, CURLOPT_POST301, 1);
943 #endif
944 #ifdef CURLPROTO_HTTP
945 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
946 get_curl_allowed_protocols(0));
947 curl_easy_setopt(result, CURLOPT_PROTOCOLS,
948 get_curl_allowed_protocols(-1));
949 #else
950 warning(_("Protocol restrictions not supported with cURL < 7.19.4"));
951 #endif
952 if (getenv("GIT_CURL_VERBOSE"))
953 curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
954 setup_curl_trace(result);
955 if (getenv("GIT_TRACE_CURL_NO_DATA"))
956 trace_curl_data = 0;
957 if (getenv("GIT_REDACT_COOKIES")) {
958 string_list_split(&cookies_to_redact,
959 getenv("GIT_REDACT_COOKIES"), ',', -1);
960 string_list_sort(&cookies_to_redact);
961 }
962
963 curl_easy_setopt(result, CURLOPT_USERAGENT,
964 user_agent ? user_agent : git_user_agent());
965
966 if (curl_ftp_no_epsv)
967 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
968
969 #ifdef CURLOPT_USE_SSL
970 if (curl_ssl_try)
971 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
972 #endif
973
974 /*
975 * CURL also examines these variables as a fallback; but we need to query
976 * them here in order to decide whether to prompt for missing password (cf.
977 * init_curl_proxy_auth()).
978 *
979 * Unlike many other common environment variables, these are historically
980 * lowercase only. It appears that CURL did not know this and implemented
981 * only uppercase variants, which was later corrected to take both - with
982 * the exception of http_proxy, which is lowercase only also in CURL. As
983 * the lowercase versions are the historical quasi-standard, they take
984 * precedence here, as in CURL.
985 */
986 if (!curl_http_proxy) {
987 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
988 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
989 var_override(&curl_http_proxy, getenv("https_proxy"));
990 } else {
991 var_override(&curl_http_proxy, getenv("http_proxy"));
992 }
993 if (!curl_http_proxy) {
994 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
995 var_override(&curl_http_proxy, getenv("all_proxy"));
996 }
997 }
998
999 if (curl_http_proxy && curl_http_proxy[0] == '\0') {
1000 /*
1001 * Handle case with the empty http.proxy value here to keep
1002 * common code clean.
1003 * NB: empty option disables proxying at all.
1004 */
1005 curl_easy_setopt(result, CURLOPT_PROXY, "");
1006 } else if (curl_http_proxy) {
1007 #if LIBCURL_VERSION_NUM >= 0x071800
1008 if (starts_with(curl_http_proxy, "socks5h"))
1009 curl_easy_setopt(result,
1010 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
1011 else if (starts_with(curl_http_proxy, "socks5"))
1012 curl_easy_setopt(result,
1013 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
1014 else if (starts_with(curl_http_proxy, "socks4a"))
1015 curl_easy_setopt(result,
1016 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
1017 else if (starts_with(curl_http_proxy, "socks"))
1018 curl_easy_setopt(result,
1019 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
1020 #endif
1021 #if LIBCURL_VERSION_NUM >= 0x073400
1022 else if (starts_with(curl_http_proxy, "https"))
1023 curl_easy_setopt(result,
1024 CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
1025 #endif
1026 if (strstr(curl_http_proxy, "://"))
1027 credential_from_url(&proxy_auth, curl_http_proxy);
1028 else {
1029 struct strbuf url = STRBUF_INIT;
1030 strbuf_addf(&url, "http://%s", curl_http_proxy);
1031 credential_from_url(&proxy_auth, url.buf);
1032 strbuf_release(&url);
1033 }
1034
1035 if (!proxy_auth.host)
1036 die("Invalid proxy URL '%s'", curl_http_proxy);
1037
1038 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
1039 #if LIBCURL_VERSION_NUM >= 0x071304
1040 var_override(&curl_no_proxy, getenv("NO_PROXY"));
1041 var_override(&curl_no_proxy, getenv("no_proxy"));
1042 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
1043 #endif
1044 }
1045 init_curl_proxy_auth(result);
1046
1047 set_curl_keepalive(result);
1048
1049 return result;
1050 }
1051
1052 static void set_from_env(const char **var, const char *envname)
1053 {
1054 const char *val = getenv(envname);
1055 if (val)
1056 *var = val;
1057 }
1058
1059 void http_init(struct remote *remote, const char *url, int proactive_auth)
1060 {
1061 char *low_speed_limit;
1062 char *low_speed_time;
1063 char *normalized_url;
1064 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
1065
1066 config.section = "http";
1067 config.key = NULL;
1068 config.collect_fn = http_options;
1069 config.cascade_fn = git_default_config;
1070 config.cb = NULL;
1071
1072 http_is_verbose = 0;
1073 normalized_url = url_normalize(url, &config.url);
1074
1075 git_config(urlmatch_config_entry, &config);
1076 free(normalized_url);
1077 string_list_clear(&config.vars, 1);
1078
1079 #if LIBCURL_VERSION_NUM >= 0x073800
1080 if (http_ssl_backend) {
1081 const curl_ssl_backend **backends;
1082 struct strbuf buf = STRBUF_INIT;
1083 int i;
1084
1085 switch (curl_global_sslset(-1, http_ssl_backend, &backends)) {
1086 case CURLSSLSET_UNKNOWN_BACKEND:
1087 strbuf_addf(&buf, _("Unsupported SSL backend '%s'. "
1088 "Supported SSL backends:"),
1089 http_ssl_backend);
1090 for (i = 0; backends[i]; i++)
1091 strbuf_addf(&buf, "\n\t%s", backends[i]->name);
1092 die("%s", buf.buf);
1093 case CURLSSLSET_NO_BACKENDS:
1094 die(_("Could not set SSL backend to '%s': "
1095 "cURL was built without SSL backends"),
1096 http_ssl_backend);
1097 case CURLSSLSET_TOO_LATE:
1098 die(_("Could not set SSL backend to '%s': already set"),
1099 http_ssl_backend);
1100 case CURLSSLSET_OK:
1101 break; /* Okay! */
1102 }
1103 }
1104 #endif
1105
1106 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1107 die("curl_global_init failed");
1108
1109 http_proactive_auth = proactive_auth;
1110
1111 if (remote && remote->http_proxy)
1112 curl_http_proxy = xstrdup(remote->http_proxy);
1113
1114 if (remote)
1115 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
1116
1117 pragma_header = curl_slist_append(http_copy_default_headers(),
1118 "Pragma: no-cache");
1119 no_pragma_header = curl_slist_append(http_copy_default_headers(),
1120 "Pragma:");
1121
1122 #ifdef USE_CURL_MULTI
1123 {
1124 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1125 if (http_max_requests != NULL)
1126 max_requests = atoi(http_max_requests);
1127 }
1128
1129 curlm = curl_multi_init();
1130 if (!curlm)
1131 die("curl_multi_init failed");
1132 #endif
1133
1134 if (getenv("GIT_SSL_NO_VERIFY"))
1135 curl_ssl_verify = 0;
1136
1137 set_from_env(&ssl_cert, "GIT_SSL_CERT");
1138 #if LIBCURL_VERSION_NUM >= 0x070903
1139 set_from_env(&ssl_key, "GIT_SSL_KEY");
1140 #endif
1141 #if LIBCURL_VERSION_NUM >= 0x070908
1142 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
1143 #endif
1144 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
1145
1146 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
1147
1148 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1149 if (low_speed_limit != NULL)
1150 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1151 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1152 if (low_speed_time != NULL)
1153 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1154
1155 if (curl_ssl_verify == -1)
1156 curl_ssl_verify = 1;
1157
1158 curl_session_count = 0;
1159 #ifdef USE_CURL_MULTI
1160 if (max_requests < 1)
1161 max_requests = DEFAULT_MAX_REQUESTS;
1162 #endif
1163
1164 if (getenv("GIT_CURL_FTP_NO_EPSV"))
1165 curl_ftp_no_epsv = 1;
1166
1167 if (url) {
1168 credential_from_url(&http_auth, url);
1169 if (!ssl_cert_password_required &&
1170 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1171 starts_with(url, "https://"))
1172 ssl_cert_password_required = 1;
1173 }
1174
1175 #ifndef NO_CURL_EASY_DUPHANDLE
1176 curl_default = get_curl_handle();
1177 #endif
1178 }
1179
1180 void http_cleanup(void)
1181 {
1182 struct active_request_slot *slot = active_queue_head;
1183
1184 while (slot != NULL) {
1185 struct active_request_slot *next = slot->next;
1186 if (slot->curl != NULL) {
1187 xmulti_remove_handle(slot);
1188 curl_easy_cleanup(slot->curl);
1189 }
1190 free(slot);
1191 slot = next;
1192 }
1193 active_queue_head = NULL;
1194
1195 #ifndef NO_CURL_EASY_DUPHANDLE
1196 curl_easy_cleanup(curl_default);
1197 #endif
1198
1199 #ifdef USE_CURL_MULTI
1200 curl_multi_cleanup(curlm);
1201 #endif
1202 curl_global_cleanup();
1203
1204 string_list_clear(&extra_http_headers, 0);
1205
1206 curl_slist_free_all(pragma_header);
1207 pragma_header = NULL;
1208
1209 curl_slist_free_all(no_pragma_header);
1210 no_pragma_header = NULL;
1211
1212 if (curl_http_proxy) {
1213 free((void *)curl_http_proxy);
1214 curl_http_proxy = NULL;
1215 }
1216
1217 if (proxy_auth.password) {
1218 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1219 FREE_AND_NULL(proxy_auth.password);
1220 }
1221
1222 free((void *)curl_proxyuserpwd);
1223 curl_proxyuserpwd = NULL;
1224
1225 free((void *)http_proxy_authmethod);
1226 http_proxy_authmethod = NULL;
1227
1228 if (cert_auth.password != NULL) {
1229 memset(cert_auth.password, 0, strlen(cert_auth.password));
1230 FREE_AND_NULL(cert_auth.password);
1231 }
1232 ssl_cert_password_required = 0;
1233
1234 FREE_AND_NULL(cached_accept_language);
1235 }
1236
1237 struct active_request_slot *get_active_slot(void)
1238 {
1239 struct active_request_slot *slot = active_queue_head;
1240 struct active_request_slot *newslot;
1241
1242 #ifdef USE_CURL_MULTI
1243 int num_transfers;
1244
1245 /* Wait for a slot to open up if the queue is full */
1246 while (active_requests >= max_requests) {
1247 curl_multi_perform(curlm, &num_transfers);
1248 if (num_transfers < active_requests)
1249 process_curl_messages();
1250 }
1251 #endif
1252
1253 while (slot != NULL && slot->in_use)
1254 slot = slot->next;
1255
1256 if (slot == NULL) {
1257 newslot = xmalloc(sizeof(*newslot));
1258 newslot->curl = NULL;
1259 newslot->in_use = 0;
1260 newslot->next = NULL;
1261
1262 slot = active_queue_head;
1263 if (slot == NULL) {
1264 active_queue_head = newslot;
1265 } else {
1266 while (slot->next != NULL)
1267 slot = slot->next;
1268 slot->next = newslot;
1269 }
1270 slot = newslot;
1271 }
1272
1273 if (slot->curl == NULL) {
1274 #ifdef NO_CURL_EASY_DUPHANDLE
1275 slot->curl = get_curl_handle();
1276 #else
1277 slot->curl = curl_easy_duphandle(curl_default);
1278 #endif
1279 curl_session_count++;
1280 }
1281
1282 active_requests++;
1283 slot->in_use = 1;
1284 slot->results = NULL;
1285 slot->finished = NULL;
1286 slot->callback_data = NULL;
1287 slot->callback_func = NULL;
1288 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1289 if (curl_save_cookies)
1290 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1291 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1292 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1293 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1294 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1295 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1296 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1297 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1298 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1299 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1300 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1301
1302 /*
1303 * Default following to off unless "ALWAYS" is configured; this gives
1304 * callers a sane starting point, and they can tweak for individual
1305 * HTTP_FOLLOW_* cases themselves.
1306 */
1307 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1308 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1309 else
1310 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1311
1312 #if LIBCURL_VERSION_NUM >= 0x070a08
1313 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1314 #endif
1315 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1316 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1317 #endif
1318 if (http_auth.password || curl_empty_auth_enabled())
1319 init_curl_http_auth(slot->curl);
1320
1321 return slot;
1322 }
1323
1324 int start_active_slot(struct active_request_slot *slot)
1325 {
1326 #ifdef USE_CURL_MULTI
1327 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1328 int num_transfers;
1329
1330 if (curlm_result != CURLM_OK &&
1331 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1332 warning("curl_multi_add_handle failed: %s",
1333 curl_multi_strerror(curlm_result));
1334 active_requests--;
1335 slot->in_use = 0;
1336 return 0;
1337 }
1338
1339 /*
1340 * We know there must be something to do, since we just added
1341 * something.
1342 */
1343 curl_multi_perform(curlm, &num_transfers);
1344 #endif
1345 return 1;
1346 }
1347
1348 #ifdef USE_CURL_MULTI
1349 struct fill_chain {
1350 void *data;
1351 int (*fill)(void *);
1352 struct fill_chain *next;
1353 };
1354
1355 static struct fill_chain *fill_cfg;
1356
1357 void add_fill_function(void *data, int (*fill)(void *))
1358 {
1359 struct fill_chain *new_fill = xmalloc(sizeof(*new_fill));
1360 struct fill_chain **linkp = &fill_cfg;
1361 new_fill->data = data;
1362 new_fill->fill = fill;
1363 new_fill->next = NULL;
1364 while (*linkp)
1365 linkp = &(*linkp)->next;
1366 *linkp = new_fill;
1367 }
1368
1369 void fill_active_slots(void)
1370 {
1371 struct active_request_slot *slot = active_queue_head;
1372
1373 while (active_requests < max_requests) {
1374 struct fill_chain *fill;
1375 for (fill = fill_cfg; fill; fill = fill->next)
1376 if (fill->fill(fill->data))
1377 break;
1378
1379 if (!fill)
1380 break;
1381 }
1382
1383 while (slot != NULL) {
1384 if (!slot->in_use && slot->curl != NULL
1385 && curl_session_count > min_curl_sessions) {
1386 curl_easy_cleanup(slot->curl);
1387 slot->curl = NULL;
1388 curl_session_count--;
1389 }
1390 slot = slot->next;
1391 }
1392 }
1393
1394 void step_active_slots(void)
1395 {
1396 int num_transfers;
1397 CURLMcode curlm_result;
1398
1399 do {
1400 curlm_result = curl_multi_perform(curlm, &num_transfers);
1401 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1402 if (num_transfers < active_requests) {
1403 process_curl_messages();
1404 fill_active_slots();
1405 }
1406 }
1407 #endif
1408
1409 void run_active_slot(struct active_request_slot *slot)
1410 {
1411 #ifdef USE_CURL_MULTI
1412 fd_set readfds;
1413 fd_set writefds;
1414 fd_set excfds;
1415 int max_fd;
1416 struct timeval select_timeout;
1417 int finished = 0;
1418
1419 slot->finished = &finished;
1420 while (!finished) {
1421 step_active_slots();
1422
1423 if (slot->in_use) {
1424 #if LIBCURL_VERSION_NUM >= 0x070f04
1425 long curl_timeout;
1426 curl_multi_timeout(curlm, &curl_timeout);
1427 if (curl_timeout == 0) {
1428 continue;
1429 } else if (curl_timeout == -1) {
1430 select_timeout.tv_sec = 0;
1431 select_timeout.tv_usec = 50000;
1432 } else {
1433 select_timeout.tv_sec = curl_timeout / 1000;
1434 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1435 }
1436 #else
1437 select_timeout.tv_sec = 0;
1438 select_timeout.tv_usec = 50000;
1439 #endif
1440
1441 max_fd = -1;
1442 FD_ZERO(&readfds);
1443 FD_ZERO(&writefds);
1444 FD_ZERO(&excfds);
1445 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1446
1447 /*
1448 * It can happen that curl_multi_timeout returns a pathologically
1449 * long timeout when curl_multi_fdset returns no file descriptors
1450 * to read. See commit message for more details.
1451 */
1452 if (max_fd < 0 &&
1453 (select_timeout.tv_sec > 0 ||
1454 select_timeout.tv_usec > 50000)) {
1455 select_timeout.tv_sec = 0;
1456 select_timeout.tv_usec = 50000;
1457 }
1458
1459 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1460 }
1461 }
1462 #else
1463 while (slot->in_use) {
1464 slot->curl_result = curl_easy_perform(slot->curl);
1465 finish_active_slot(slot);
1466 }
1467 #endif
1468 }
1469
1470 static void release_active_slot(struct active_request_slot *slot)
1471 {
1472 closedown_active_slot(slot);
1473 if (slot->curl) {
1474 xmulti_remove_handle(slot);
1475 if (curl_session_count > min_curl_sessions) {
1476 curl_easy_cleanup(slot->curl);
1477 slot->curl = NULL;
1478 curl_session_count--;
1479 }
1480 }
1481 #ifdef USE_CURL_MULTI
1482 fill_active_slots();
1483 #endif
1484 }
1485
1486 void finish_all_active_slots(void)
1487 {
1488 struct active_request_slot *slot = active_queue_head;
1489
1490 while (slot != NULL)
1491 if (slot->in_use) {
1492 run_active_slot(slot);
1493 slot = active_queue_head;
1494 } else {
1495 slot = slot->next;
1496 }
1497 }
1498
1499 /* Helpers for modifying and creating URLs */
1500 static inline int needs_quote(int ch)
1501 {
1502 if (((ch >= 'A') && (ch <= 'Z'))
1503 || ((ch >= 'a') && (ch <= 'z'))
1504 || ((ch >= '0') && (ch <= '9'))
1505 || (ch == '/')
1506 || (ch == '-')
1507 || (ch == '.'))
1508 return 0;
1509 return 1;
1510 }
1511
1512 static char *quote_ref_url(const char *base, const char *ref)
1513 {
1514 struct strbuf buf = STRBUF_INIT;
1515 const char *cp;
1516 int ch;
1517
1518 end_url_with_slash(&buf, base);
1519
1520 for (cp = ref; (ch = *cp) != 0; cp++)
1521 if (needs_quote(ch))
1522 strbuf_addf(&buf, "%%%02x", ch);
1523 else
1524 strbuf_addch(&buf, *cp);
1525
1526 return strbuf_detach(&buf, NULL);
1527 }
1528
1529 void append_remote_object_url(struct strbuf *buf, const char *url,
1530 const char *hex,
1531 int only_two_digit_prefix)
1532 {
1533 end_url_with_slash(buf, url);
1534
1535 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1536 if (!only_two_digit_prefix)
1537 strbuf_addstr(buf, hex + 2);
1538 }
1539
1540 char *get_remote_object_url(const char *url, const char *hex,
1541 int only_two_digit_prefix)
1542 {
1543 struct strbuf buf = STRBUF_INIT;
1544 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1545 return strbuf_detach(&buf, NULL);
1546 }
1547
1548 void normalize_curl_result(CURLcode *result, long http_code,
1549 char *errorstr, size_t errorlen)
1550 {
1551 /*
1552 * If we see a failing http code with CURLE_OK, we have turned off
1553 * FAILONERROR (to keep the server's custom error response), and should
1554 * translate the code into failure here.
1555 *
1556 * Likewise, if we see a redirect (30x code), that means we turned off
1557 * redirect-following, and we should treat the result as an error.
1558 */
1559 if (*result == CURLE_OK && http_code >= 300) {
1560 *result = CURLE_HTTP_RETURNED_ERROR;
1561 /*
1562 * Normally curl will already have put the "reason phrase"
1563 * from the server into curl_errorstr; unfortunately without
1564 * FAILONERROR it is lost, so we can give only the numeric
1565 * status code.
1566 */
1567 xsnprintf(errorstr, errorlen,
1568 "The requested URL returned error: %ld",
1569 http_code);
1570 }
1571 }
1572
1573 static int handle_curl_result(struct slot_results *results)
1574 {
1575 normalize_curl_result(&results->curl_result, results->http_code,
1576 curl_errorstr, sizeof(curl_errorstr));
1577
1578 if (results->curl_result == CURLE_OK) {
1579 credential_approve(&http_auth);
1580 if (proxy_auth.password)
1581 credential_approve(&proxy_auth);
1582 return HTTP_OK;
1583 } else if (missing_target(results))
1584 return HTTP_MISSING_TARGET;
1585 else if (results->http_code == 401) {
1586 if (http_auth.username && http_auth.password) {
1587 credential_reject(&http_auth);
1588 return HTTP_NOAUTH;
1589 } else {
1590 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1591 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1592 if (results->auth_avail) {
1593 http_auth_methods &= results->auth_avail;
1594 http_auth_methods_restricted = 1;
1595 }
1596 #endif
1597 return HTTP_REAUTH;
1598 }
1599 } else {
1600 if (results->http_connectcode == 407)
1601 credential_reject(&proxy_auth);
1602 #if LIBCURL_VERSION_NUM >= 0x070c00
1603 if (!curl_errorstr[0])
1604 strlcpy(curl_errorstr,
1605 curl_easy_strerror(results->curl_result),
1606 sizeof(curl_errorstr));
1607 #endif
1608 return HTTP_ERROR;
1609 }
1610 }
1611
1612 int run_one_slot(struct active_request_slot *slot,
1613 struct slot_results *results)
1614 {
1615 slot->results = results;
1616 if (!start_active_slot(slot)) {
1617 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1618 "failed to start HTTP request");
1619 return HTTP_START_FAILED;
1620 }
1621
1622 run_active_slot(slot);
1623 return handle_curl_result(results);
1624 }
1625
1626 struct curl_slist *http_copy_default_headers(void)
1627 {
1628 struct curl_slist *headers = NULL;
1629 const struct string_list_item *item;
1630
1631 for_each_string_list_item(item, &extra_http_headers)
1632 headers = curl_slist_append(headers, item->string);
1633
1634 return headers;
1635 }
1636
1637 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1638 {
1639 char *ptr;
1640 CURLcode ret;
1641
1642 strbuf_reset(buf);
1643 ret = curl_easy_getinfo(curl, info, &ptr);
1644 if (!ret && ptr)
1645 strbuf_addstr(buf, ptr);
1646 return ret;
1647 }
1648
1649 /*
1650 * Check for and extract a content-type parameter. "raw"
1651 * should be positioned at the start of the potential
1652 * parameter, with any whitespace already removed.
1653 *
1654 * "name" is the name of the parameter. The value is appended
1655 * to "out".
1656 */
1657 static int extract_param(const char *raw, const char *name,
1658 struct strbuf *out)
1659 {
1660 size_t len = strlen(name);
1661
1662 if (strncasecmp(raw, name, len))
1663 return -1;
1664 raw += len;
1665
1666 if (*raw != '=')
1667 return -1;
1668 raw++;
1669
1670 while (*raw && !isspace(*raw) && *raw != ';')
1671 strbuf_addch(out, *raw++);
1672 return 0;
1673 }
1674
1675 /*
1676 * Extract a normalized version of the content type, with any
1677 * spaces suppressed, all letters lowercased, and no trailing ";"
1678 * or parameters.
1679 *
1680 * Note that we will silently remove even invalid whitespace. For
1681 * example, "text / plain" is specifically forbidden by RFC 2616,
1682 * but "text/plain" is the only reasonable output, and this keeps
1683 * our code simple.
1684 *
1685 * If the "charset" argument is not NULL, store the value of any
1686 * charset parameter there.
1687 *
1688 * Example:
1689 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1690 * "text / plain" -> "text/plain"
1691 */
1692 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1693 struct strbuf *charset)
1694 {
1695 const char *p;
1696
1697 strbuf_reset(type);
1698 strbuf_grow(type, raw->len);
1699 for (p = raw->buf; *p; p++) {
1700 if (isspace(*p))
1701 continue;
1702 if (*p == ';') {
1703 p++;
1704 break;
1705 }
1706 strbuf_addch(type, tolower(*p));
1707 }
1708
1709 if (!charset)
1710 return;
1711
1712 strbuf_reset(charset);
1713 while (*p) {
1714 while (isspace(*p) || *p == ';')
1715 p++;
1716 if (!extract_param(p, "charset", charset))
1717 return;
1718 while (*p && !isspace(*p))
1719 p++;
1720 }
1721
1722 if (!charset->len && starts_with(type->buf, "text/"))
1723 strbuf_addstr(charset, "ISO-8859-1");
1724 }
1725
1726 static void write_accept_language(struct strbuf *buf)
1727 {
1728 /*
1729 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1730 * that, q-value will be smaller than 0.001, the minimum q-value the
1731 * HTTP specification allows. See
1732 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1733 */
1734 const int MAX_DECIMAL_PLACES = 3;
1735 const int MAX_LANGUAGE_TAGS = 1000;
1736 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1737 char **language_tags = NULL;
1738 int num_langs = 0;
1739 const char *s = get_preferred_languages();
1740 int i;
1741 struct strbuf tag = STRBUF_INIT;
1742
1743 /* Don't add Accept-Language header if no language is preferred. */
1744 if (!s)
1745 return;
1746
1747 /*
1748 * Split the colon-separated string of preferred languages into
1749 * language_tags array.
1750 */
1751 do {
1752 /* collect language tag */
1753 for (; *s && (isalnum(*s) || *s == '_'); s++)
1754 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1755
1756 /* skip .codeset, @modifier and any other unnecessary parts */
1757 while (*s && *s != ':')
1758 s++;
1759
1760 if (tag.len) {
1761 num_langs++;
1762 REALLOC_ARRAY(language_tags, num_langs);
1763 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1764 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1765 break;
1766 }
1767 } while (*s++);
1768
1769 /* write Accept-Language header into buf */
1770 if (num_langs) {
1771 int last_buf_len = 0;
1772 int max_q;
1773 int decimal_places;
1774 char q_format[32];
1775
1776 /* add '*' */
1777 REALLOC_ARRAY(language_tags, num_langs + 1);
1778 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1779
1780 /* compute decimal_places */
1781 for (max_q = 1, decimal_places = 0;
1782 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1783 decimal_places++, max_q *= 10)
1784 ;
1785
1786 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1787
1788 strbuf_addstr(buf, "Accept-Language: ");
1789
1790 for (i = 0; i < num_langs; i++) {
1791 if (i > 0)
1792 strbuf_addstr(buf, ", ");
1793
1794 strbuf_addstr(buf, language_tags[i]);
1795
1796 if (i > 0)
1797 strbuf_addf(buf, q_format, max_q - i);
1798
1799 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1800 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1801 break;
1802 }
1803
1804 last_buf_len = buf->len;
1805 }
1806 }
1807
1808 /* free language tags -- last one is a static '*' */
1809 for (i = 0; i < num_langs - 1; i++)
1810 free(language_tags[i]);
1811 free(language_tags);
1812 }
1813
1814 /*
1815 * Get an Accept-Language header which indicates user's preferred languages.
1816 *
1817 * Examples:
1818 * LANGUAGE= -> ""
1819 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1820 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1821 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1822 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1823 * LANGUAGE= LANG=C -> ""
1824 */
1825 static const char *get_accept_language(void)
1826 {
1827 if (!cached_accept_language) {
1828 struct strbuf buf = STRBUF_INIT;
1829 write_accept_language(&buf);
1830 if (buf.len > 0)
1831 cached_accept_language = strbuf_detach(&buf, NULL);
1832 }
1833
1834 return cached_accept_language;
1835 }
1836
1837 static void http_opt_request_remainder(CURL *curl, off_t pos)
1838 {
1839 char buf[128];
1840 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1841 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1842 }
1843
1844 /* http_request() targets */
1845 #define HTTP_REQUEST_STRBUF 0
1846 #define HTTP_REQUEST_FILE 1
1847
1848 static int http_request(const char *url,
1849 void *result, int target,
1850 const struct http_get_options *options)
1851 {
1852 struct active_request_slot *slot;
1853 struct slot_results results;
1854 struct curl_slist *headers = http_copy_default_headers();
1855 struct strbuf buf = STRBUF_INIT;
1856 const char *accept_language;
1857 int ret;
1858
1859 slot = get_active_slot();
1860 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1861
1862 if (result == NULL) {
1863 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1864 } else {
1865 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1866 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1867
1868 if (target == HTTP_REQUEST_FILE) {
1869 off_t posn = ftello(result);
1870 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1871 fwrite);
1872 if (posn > 0)
1873 http_opt_request_remainder(slot->curl, posn);
1874 } else
1875 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1876 fwrite_buffer);
1877 }
1878
1879 accept_language = get_accept_language();
1880
1881 if (accept_language)
1882 headers = curl_slist_append(headers, accept_language);
1883
1884 strbuf_addstr(&buf, "Pragma:");
1885 if (options && options->no_cache)
1886 strbuf_addstr(&buf, " no-cache");
1887 if (options && options->initial_request &&
1888 http_follow_config == HTTP_FOLLOW_INITIAL)
1889 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1890
1891 headers = curl_slist_append(headers, buf.buf);
1892
1893 /* Add additional headers here */
1894 if (options && options->extra_headers) {
1895 const struct string_list_item *item;
1896 for_each_string_list_item(item, options->extra_headers) {
1897 headers = curl_slist_append(headers, item->string);
1898 }
1899 }
1900
1901 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1902 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1903 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1904 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1905
1906 ret = run_one_slot(slot, &results);
1907
1908 if (options && options->content_type) {
1909 struct strbuf raw = STRBUF_INIT;
1910 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1911 extract_content_type(&raw, options->content_type,
1912 options->charset);
1913 strbuf_release(&raw);
1914 }
1915
1916 if (options && options->effective_url)
1917 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1918 options->effective_url);
1919
1920 curl_slist_free_all(headers);
1921 strbuf_release(&buf);
1922
1923 return ret;
1924 }
1925
1926 /*
1927 * Update the "base" url to a more appropriate value, as deduced by
1928 * redirects seen when requesting a URL starting with "url".
1929 *
1930 * The "asked" parameter is a URL that we asked curl to access, and must begin
1931 * with "base".
1932 *
1933 * The "got" parameter is the URL that curl reported to us as where we ended
1934 * up.
1935 *
1936 * Returns 1 if we updated the base url, 0 otherwise.
1937 *
1938 * Our basic strategy is to compare "base" and "asked" to find the bits
1939 * specific to our request. We then strip those bits off of "got" to yield the
1940 * new base. So for example, if our base is "http://example.com/foo.git",
1941 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1942 * with "https://other.example.com/foo.git/info/refs". We would want the
1943 * new URL to become "https://other.example.com/foo.git".
1944 *
1945 * Note that this assumes a sane redirect scheme. It's entirely possible
1946 * in the example above to end up at a URL that does not even end in
1947 * "info/refs". In such a case we die. There's not much we can do, such a
1948 * scheme is unlikely to represent a real git repository, and failing to
1949 * rewrite the base opens options for malicious redirects to do funny things.
1950 */
1951 static int update_url_from_redirect(struct strbuf *base,
1952 const char *asked,
1953 const struct strbuf *got)
1954 {
1955 const char *tail;
1956 size_t new_len;
1957
1958 if (!strcmp(asked, got->buf))
1959 return 0;
1960
1961 if (!skip_prefix(asked, base->buf, &tail))
1962 BUG("update_url_from_redirect: %s is not a superset of %s",
1963 asked, base->buf);
1964
1965 new_len = got->len;
1966 if (!strip_suffix_mem(got->buf, &new_len, tail))
1967 die(_("unable to update url base from redirection:\n"
1968 " asked for: %s\n"
1969 " redirect: %s"),
1970 asked, got->buf);
1971
1972 strbuf_reset(base);
1973 strbuf_add(base, got->buf, new_len);
1974
1975 return 1;
1976 }
1977
1978 static int http_request_reauth(const char *url,
1979 void *result, int target,
1980 struct http_get_options *options)
1981 {
1982 int ret = http_request(url, result, target, options);
1983
1984 if (ret != HTTP_OK && ret != HTTP_REAUTH)
1985 return ret;
1986
1987 if (options && options->effective_url && options->base_url) {
1988 if (update_url_from_redirect(options->base_url,
1989 url, options->effective_url)) {
1990 credential_from_url(&http_auth, options->base_url->buf);
1991 url = options->effective_url->buf;
1992 }
1993 }
1994
1995 if (ret != HTTP_REAUTH)
1996 return ret;
1997
1998 /*
1999 * The previous request may have put cruft into our output stream; we
2000 * should clear it out before making our next request.
2001 */
2002 switch (target) {
2003 case HTTP_REQUEST_STRBUF:
2004 strbuf_reset(result);
2005 break;
2006 case HTTP_REQUEST_FILE:
2007 if (fflush(result)) {
2008 error_errno("unable to flush a file");
2009 return HTTP_START_FAILED;
2010 }
2011 rewind(result);
2012 if (ftruncate(fileno(result), 0) < 0) {
2013 error_errno("unable to truncate a file");
2014 return HTTP_START_FAILED;
2015 }
2016 break;
2017 default:
2018 BUG("Unknown http_request target");
2019 }
2020
2021 credential_fill(&http_auth);
2022
2023 return http_request(url, result, target, options);
2024 }
2025
2026 int http_get_strbuf(const char *url,
2027 struct strbuf *result,
2028 struct http_get_options *options)
2029 {
2030 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
2031 }
2032
2033 /*
2034 * Downloads a URL and stores the result in the given file.
2035 *
2036 * If a previous interrupted download is detected (i.e. a previous temporary
2037 * file is still around) the download is resumed.
2038 */
2039 static int http_get_file(const char *url, const char *filename,
2040 struct http_get_options *options)
2041 {
2042 int ret;
2043 struct strbuf tmpfile = STRBUF_INIT;
2044 FILE *result;
2045
2046 strbuf_addf(&tmpfile, "%s.temp", filename);
2047 result = fopen(tmpfile.buf, "a");
2048 if (!result) {
2049 error("Unable to open local file %s", tmpfile.buf);
2050 ret = HTTP_ERROR;
2051 goto cleanup;
2052 }
2053
2054 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
2055 fclose(result);
2056
2057 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
2058 ret = HTTP_ERROR;
2059 cleanup:
2060 strbuf_release(&tmpfile);
2061 return ret;
2062 }
2063
2064 int http_fetch_ref(const char *base, struct ref *ref)
2065 {
2066 struct http_get_options options = {0};
2067 char *url;
2068 struct strbuf buffer = STRBUF_INIT;
2069 int ret = -1;
2070
2071 options.no_cache = 1;
2072
2073 url = quote_ref_url(base, ref->name);
2074 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
2075 strbuf_rtrim(&buffer);
2076 if (buffer.len == the_hash_algo->hexsz)
2077 ret = get_oid_hex(buffer.buf, &ref->old_oid);
2078 else if (starts_with(buffer.buf, "ref: ")) {
2079 ref->symref = xstrdup(buffer.buf + 5);
2080 ret = 0;
2081 }
2082 }
2083
2084 strbuf_release(&buffer);
2085 free(url);
2086 return ret;
2087 }
2088
2089 /* Helpers for fetching packs */
2090 static char *fetch_pack_index(unsigned char *hash, const char *base_url)
2091 {
2092 char *url, *tmp;
2093 struct strbuf buf = STRBUF_INIT;
2094
2095 if (http_is_verbose)
2096 fprintf(stderr, "Getting index for pack %s\n", hash_to_hex(hash));
2097
2098 end_url_with_slash(&buf, base_url);
2099 strbuf_addf(&buf, "objects/pack/pack-%s.idx", hash_to_hex(hash));
2100 url = strbuf_detach(&buf, NULL);
2101
2102 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(hash));
2103 tmp = strbuf_detach(&buf, NULL);
2104
2105 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
2106 error("Unable to get pack index %s", url);
2107 FREE_AND_NULL(tmp);
2108 }
2109
2110 free(url);
2111 return tmp;
2112 }
2113
2114 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
2115 unsigned char *sha1, const char *base_url)
2116 {
2117 struct packed_git *new_pack;
2118 char *tmp_idx = NULL;
2119 int ret;
2120
2121 if (has_pack_index(sha1)) {
2122 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
2123 if (!new_pack)
2124 return -1; /* parse_pack_index() already issued error message */
2125 goto add_pack;
2126 }
2127
2128 tmp_idx = fetch_pack_index(sha1, base_url);
2129 if (!tmp_idx)
2130 return -1;
2131
2132 new_pack = parse_pack_index(sha1, tmp_idx);
2133 if (!new_pack) {
2134 unlink(tmp_idx);
2135 free(tmp_idx);
2136
2137 return -1; /* parse_pack_index() already issued error message */
2138 }
2139
2140 ret = verify_pack_index(new_pack);
2141 if (!ret) {
2142 close_pack_index(new_pack);
2143 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
2144 }
2145 free(tmp_idx);
2146 if (ret)
2147 return -1;
2148
2149 add_pack:
2150 new_pack->next = *packs_head;
2151 *packs_head = new_pack;
2152 return 0;
2153 }
2154
2155 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
2156 {
2157 struct http_get_options options = {0};
2158 int ret = 0;
2159 char *url;
2160 const char *data;
2161 struct strbuf buf = STRBUF_INIT;
2162 struct object_id oid;
2163
2164 end_url_with_slash(&buf, base_url);
2165 strbuf_addstr(&buf, "objects/info/packs");
2166 url = strbuf_detach(&buf, NULL);
2167
2168 options.no_cache = 1;
2169 ret = http_get_strbuf(url, &buf, &options);
2170 if (ret != HTTP_OK)
2171 goto cleanup;
2172
2173 data = buf.buf;
2174 while (*data) {
2175 if (skip_prefix(data, "P pack-", &data) &&
2176 !parse_oid_hex(data, &oid, &data) &&
2177 skip_prefix(data, ".pack", &data) &&
2178 (*data == '\n' || *data == '\0')) {
2179 fetch_and_setup_pack_index(packs_head, oid.hash, base_url);
2180 } else {
2181 data = strchrnul(data, '\n');
2182 }
2183 if (*data)
2184 data++; /* skip past newline */
2185 }
2186
2187 cleanup:
2188 free(url);
2189 return ret;
2190 }
2191
2192 void release_http_pack_request(struct http_pack_request *preq)
2193 {
2194 if (preq->packfile != NULL) {
2195 fclose(preq->packfile);
2196 preq->packfile = NULL;
2197 }
2198 preq->slot = NULL;
2199 strbuf_release(&preq->tmpfile);
2200 free(preq->url);
2201 free(preq);
2202 }
2203
2204 int finish_http_pack_request(struct http_pack_request *preq)
2205 {
2206 struct packed_git **lst;
2207 struct packed_git *p = preq->target;
2208 char *tmp_idx;
2209 size_t len;
2210 struct child_process ip = CHILD_PROCESS_INIT;
2211
2212 close_pack_index(p);
2213
2214 fclose(preq->packfile);
2215 preq->packfile = NULL;
2216
2217 lst = preq->lst;
2218 while (*lst != p)
2219 lst = &((*lst)->next);
2220 *lst = (*lst)->next;
2221
2222 if (!strip_suffix(preq->tmpfile.buf, ".pack.temp", &len))
2223 BUG("pack tmpfile does not end in .pack.temp?");
2224 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile.buf);
2225
2226 argv_array_push(&ip.args, "index-pack");
2227 argv_array_pushl(&ip.args, "-o", tmp_idx, NULL);
2228 argv_array_push(&ip.args, preq->tmpfile.buf);
2229 ip.git_cmd = 1;
2230 ip.no_stdin = 1;
2231 ip.no_stdout = 1;
2232
2233 if (run_command(&ip)) {
2234 unlink(preq->tmpfile.buf);
2235 unlink(tmp_idx);
2236 free(tmp_idx);
2237 return -1;
2238 }
2239
2240 unlink(sha1_pack_index_name(p->hash));
2241
2242 if (finalize_object_file(preq->tmpfile.buf, sha1_pack_name(p->hash))
2243 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->hash))) {
2244 free(tmp_idx);
2245 return -1;
2246 }
2247
2248 install_packed_git(the_repository, p);
2249 free(tmp_idx);
2250 return 0;
2251 }
2252
2253 struct http_pack_request *new_http_pack_request(
2254 struct packed_git *target, const char *base_url)
2255 {
2256 off_t prev_posn = 0;
2257 struct strbuf buf = STRBUF_INIT;
2258 struct http_pack_request *preq;
2259
2260 preq = xcalloc(1, sizeof(*preq));
2261 strbuf_init(&preq->tmpfile, 0);
2262 preq->target = target;
2263
2264 end_url_with_slash(&buf, base_url);
2265 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2266 hash_to_hex(target->hash));
2267 preq->url = strbuf_detach(&buf, NULL);
2268
2269 strbuf_addf(&preq->tmpfile, "%s.temp", sha1_pack_name(target->hash));
2270 preq->packfile = fopen(preq->tmpfile.buf, "a");
2271 if (!preq->packfile) {
2272 error("Unable to open local file %s for pack",
2273 preq->tmpfile.buf);
2274 goto abort;
2275 }
2276
2277 preq->slot = get_active_slot();
2278 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2279 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2280 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2281 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2282 no_pragma_header);
2283
2284 /*
2285 * If there is data present from a previous transfer attempt,
2286 * resume where it left off
2287 */
2288 prev_posn = ftello(preq->packfile);
2289 if (prev_posn>0) {
2290 if (http_is_verbose)
2291 fprintf(stderr,
2292 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2293 hash_to_hex(target->hash),
2294 (uintmax_t)prev_posn);
2295 http_opt_request_remainder(preq->slot->curl, prev_posn);
2296 }
2297
2298 return preq;
2299
2300 abort:
2301 strbuf_release(&preq->tmpfile);
2302 free(preq->url);
2303 free(preq);
2304 return NULL;
2305 }
2306
2307 /* Helpers for fetching objects (loose) */
2308 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2309 void *data)
2310 {
2311 unsigned char expn[4096];
2312 size_t size = eltsize * nmemb;
2313 int posn = 0;
2314 struct http_object_request *freq = data;
2315 struct active_request_slot *slot = freq->slot;
2316
2317 if (slot) {
2318 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2319 &slot->http_code);
2320 if (c != CURLE_OK)
2321 BUG("curl_easy_getinfo for HTTP code failed: %s",
2322 curl_easy_strerror(c));
2323 if (slot->http_code >= 300)
2324 return nmemb;
2325 }
2326
2327 do {
2328 ssize_t retval = xwrite(freq->localfile,
2329 (char *) ptr + posn, size - posn);
2330 if (retval < 0)
2331 return posn / eltsize;
2332 posn += retval;
2333 } while (posn < size);
2334
2335 freq->stream.avail_in = size;
2336 freq->stream.next_in = (void *)ptr;
2337 do {
2338 freq->stream.next_out = expn;
2339 freq->stream.avail_out = sizeof(expn);
2340 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2341 the_hash_algo->update_fn(&freq->c, expn,
2342 sizeof(expn) - freq->stream.avail_out);
2343 } while (freq->stream.avail_in && freq->zret == Z_OK);
2344 return nmemb;
2345 }
2346
2347 struct http_object_request *new_http_object_request(const char *base_url,
2348 const struct object_id *oid)
2349 {
2350 char *hex = oid_to_hex(oid);
2351 struct strbuf filename = STRBUF_INIT;
2352 struct strbuf prevfile = STRBUF_INIT;
2353 int prevlocal;
2354 char prev_buf[PREV_BUF_SIZE];
2355 ssize_t prev_read = 0;
2356 off_t prev_posn = 0;
2357 struct http_object_request *freq;
2358
2359 freq = xcalloc(1, sizeof(*freq));
2360 strbuf_init(&freq->tmpfile, 0);
2361 oidcpy(&freq->oid, oid);
2362 freq->localfile = -1;
2363
2364 loose_object_path(the_repository, &filename, oid);
2365 strbuf_addf(&freq->tmpfile, "%s.temp", filename.buf);
2366
2367 strbuf_addf(&prevfile, "%s.prev", filename.buf);
2368 unlink_or_warn(prevfile.buf);
2369 rename(freq->tmpfile.buf, prevfile.buf);
2370 unlink_or_warn(freq->tmpfile.buf);
2371 strbuf_release(&filename);
2372
2373 if (freq->localfile != -1)
2374 error("fd leakage in start: %d", freq->localfile);
2375 freq->localfile = open(freq->tmpfile.buf,
2376 O_WRONLY | O_CREAT | O_EXCL, 0666);
2377 /*
2378 * This could have failed due to the "lazy directory creation";
2379 * try to mkdir the last path component.
2380 */
2381 if (freq->localfile < 0 && errno == ENOENT) {
2382 char *dir = strrchr(freq->tmpfile.buf, '/');
2383 if (dir) {
2384 *dir = 0;
2385 mkdir(freq->tmpfile.buf, 0777);
2386 *dir = '/';
2387 }
2388 freq->localfile = open(freq->tmpfile.buf,
2389 O_WRONLY | O_CREAT | O_EXCL, 0666);
2390 }
2391
2392 if (freq->localfile < 0) {
2393 error_errno("Couldn't create temporary file %s",
2394 freq->tmpfile.buf);
2395 goto abort;
2396 }
2397
2398 git_inflate_init(&freq->stream);
2399
2400 the_hash_algo->init_fn(&freq->c);
2401
2402 freq->url = get_remote_object_url(base_url, hex, 0);
2403
2404 /*
2405 * If a previous temp file is present, process what was already
2406 * fetched.
2407 */
2408 prevlocal = open(prevfile.buf, O_RDONLY);
2409 if (prevlocal != -1) {
2410 do {
2411 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2412 if (prev_read>0) {
2413 if (fwrite_sha1_file(prev_buf,
2414 1,
2415 prev_read,
2416 freq) == prev_read) {
2417 prev_posn += prev_read;
2418 } else {
2419 prev_read = -1;
2420 }
2421 }
2422 } while (prev_read > 0);
2423 close(prevlocal);
2424 }
2425 unlink_or_warn(prevfile.buf);
2426 strbuf_release(&prevfile);
2427
2428 /*
2429 * Reset inflate/SHA1 if there was an error reading the previous temp
2430 * file; also rewind to the beginning of the local file.
2431 */
2432 if (prev_read == -1) {
2433 memset(&freq->stream, 0, sizeof(freq->stream));
2434 git_inflate_init(&freq->stream);
2435 the_hash_algo->init_fn(&freq->c);
2436 if (prev_posn>0) {
2437 prev_posn = 0;
2438 lseek(freq->localfile, 0, SEEK_SET);
2439 if (ftruncate(freq->localfile, 0) < 0) {
2440 error_errno("Couldn't truncate temporary file %s",
2441 freq->tmpfile.buf);
2442 goto abort;
2443 }
2444 }
2445 }
2446
2447 freq->slot = get_active_slot();
2448
2449 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2450 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2451 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2452 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2453 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2454 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2455
2456 /*
2457 * If we have successfully processed data from a previous fetch
2458 * attempt, only fetch the data we don't already have.
2459 */
2460 if (prev_posn>0) {
2461 if (http_is_verbose)
2462 fprintf(stderr,
2463 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2464 hex, (uintmax_t)prev_posn);
2465 http_opt_request_remainder(freq->slot->curl, prev_posn);
2466 }
2467
2468 return freq;
2469
2470 abort:
2471 strbuf_release(&prevfile);
2472 free(freq->url);
2473 free(freq);
2474 return NULL;
2475 }
2476
2477 void process_http_object_request(struct http_object_request *freq)
2478 {
2479 if (freq->slot == NULL)
2480 return;
2481 freq->curl_result = freq->slot->curl_result;
2482 freq->http_code = freq->slot->http_code;
2483 freq->slot = NULL;
2484 }
2485
2486 int finish_http_object_request(struct http_object_request *freq)
2487 {
2488 struct stat st;
2489 struct strbuf filename = STRBUF_INIT;
2490
2491 close(freq->localfile);
2492 freq->localfile = -1;
2493
2494 process_http_object_request(freq);
2495
2496 if (freq->http_code == 416) {
2497 warning("requested range invalid; we may already have all the data.");
2498 } else if (freq->curl_result != CURLE_OK) {
2499 if (stat(freq->tmpfile.buf, &st) == 0)
2500 if (st.st_size == 0)
2501 unlink_or_warn(freq->tmpfile.buf);
2502 return -1;
2503 }
2504
2505 git_inflate_end(&freq->stream);
2506 the_hash_algo->final_fn(freq->real_oid.hash, &freq->c);
2507 if (freq->zret != Z_STREAM_END) {
2508 unlink_or_warn(freq->tmpfile.buf);
2509 return -1;
2510 }
2511 if (!oideq(&freq->oid, &freq->real_oid)) {
2512 unlink_or_warn(freq->tmpfile.buf);
2513 return -1;
2514 }
2515 loose_object_path(the_repository, &filename, &freq->oid);
2516 freq->rename = finalize_object_file(freq->tmpfile.buf, filename.buf);
2517 strbuf_release(&filename);
2518
2519 return freq->rename;
2520 }
2521
2522 void abort_http_object_request(struct http_object_request *freq)
2523 {
2524 unlink_or_warn(freq->tmpfile.buf);
2525
2526 release_http_object_request(freq);
2527 }
2528
2529 void release_http_object_request(struct http_object_request *freq)
2530 {
2531 if (freq->localfile != -1) {
2532 close(freq->localfile);
2533 freq->localfile = -1;
2534 }
2535 FREE_AND_NULL(freq->url);
2536 if (freq->slot != NULL) {
2537 freq->slot->callback_func = NULL;
2538 freq->slot->callback_data = NULL;
2539 release_active_slot(freq->slot);
2540 freq->slot = NULL;
2541 }
2542 strbuf_release(&freq->tmpfile);
2543 }
ramsay's fork of git