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promisor-remote: parse remote.*.partialclonefilter
[git.git] / http.c
blob27aa0a3192988cd0c272dab0e9f6cf52d538b6fa
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 curl_slist *extra_http_headers;
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 curl_slist_free_all(extra_http_headers);
418 extra_http_headers = NULL;
419 } else {
420 extra_http_headers =
421 curl_slist_append(extra_http_headers, value);
422 }
423 return 0;
424 }
425
426 if (!strcmp("http.followredirects", var)) {
427 if (value && !strcmp(value, "initial"))
428 http_follow_config = HTTP_FOLLOW_INITIAL;
429 else if (git_config_bool(var, value))
430 http_follow_config = HTTP_FOLLOW_ALWAYS;
431 else
432 http_follow_config = HTTP_FOLLOW_NONE;
433 return 0;
434 }
435
436 /* Fall back on the default ones */
437 return git_default_config(var, value, cb);
438 }
439
440 static int curl_empty_auth_enabled(void)
441 {
442 if (curl_empty_auth >= 0)
443 return curl_empty_auth;
444
445 #ifndef LIBCURL_CAN_HANDLE_AUTH_ANY
446 /*
447 * Our libcurl is too old to do AUTH_ANY in the first place;
448 * just default to turning the feature off.
449 */
450 #else
451 /*
452 * In the automatic case, kick in the empty-auth
453 * hack as long as we would potentially try some
454 * method more exotic than "Basic" or "Digest".
455 *
456 * But only do this when this is our second or
457 * subsequent request, as by then we know what
458 * methods are available.
459 */
460 if (http_auth_methods_restricted &&
461 (http_auth_methods & ~empty_auth_useless))
462 return 1;
463 #endif
464 return 0;
465 }
466
467 static void init_curl_http_auth(CURL *result)
468 {
469 if (!http_auth.username || !*http_auth.username) {
470 if (curl_empty_auth_enabled())
471 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
472 return;
473 }
474
475 credential_fill(&http_auth);
476
477 #if LIBCURL_VERSION_NUM >= 0x071301
478 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
479 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
480 #else
481 {
482 static struct strbuf up = STRBUF_INIT;
483 /*
484 * Note that we assume we only ever have a single set of
485 * credentials in a given program run, so we do not have
486 * to worry about updating this buffer, only setting its
487 * initial value.
488 */
489 if (!up.len)
490 strbuf_addf(&up, "%s:%s",
491 http_auth.username, http_auth.password);
492 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
493 }
494 #endif
495 }
496
497 /* *var must be free-able */
498 static void var_override(const char **var, char *value)
499 {
500 if (value) {
501 free((void *)*var);
502 *var = xstrdup(value);
503 }
504 }
505
506 static void set_proxyauth_name_password(CURL *result)
507 {
508 #if LIBCURL_VERSION_NUM >= 0x071301
509 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
510 proxy_auth.username);
511 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
512 proxy_auth.password);
513 #else
514 struct strbuf s = STRBUF_INIT;
515
516 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
517 strbuf_addch(&s, ':');
518 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
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.username = xstrdup("");
562 cert_auth.path = xstrdup(ssl_cert);
563 credential_fill(&cert_auth);
564 }
565 return 1;
566 }
567
568 #if LIBCURL_VERSION_NUM >= 0x071900
569 static void set_curl_keepalive(CURL *c)
570 {
571 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
572 }
573
574 #elif LIBCURL_VERSION_NUM >= 0x071000
575 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
576 {
577 int ka = 1;
578 int rc;
579 socklen_t len = (socklen_t)sizeof(ka);
580
581 if (type != CURLSOCKTYPE_IPCXN)
582 return 0;
583
584 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
585 if (rc < 0)
586 warning_errno("unable to set SO_KEEPALIVE on socket");
587
588 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
589 }
590
591 static void set_curl_keepalive(CURL *c)
592 {
593 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
594 }
595
596 #else
597 static void set_curl_keepalive(CURL *c)
598 {
599 /* not supported on older curl versions */
600 }
601 #endif
602
603 static void redact_sensitive_header(struct strbuf *header)
604 {
605 const char *sensitive_header;
606
607 if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
608 skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
609 /* The first token is the type, which is OK to log */
610 while (isspace(*sensitive_header))
611 sensitive_header++;
612 while (*sensitive_header && !isspace(*sensitive_header))
613 sensitive_header++;
614 /* Everything else is opaque and possibly sensitive */
615 strbuf_setlen(header, sensitive_header - header->buf);
616 strbuf_addstr(header, " <redacted>");
617 } else if (cookies_to_redact.nr &&
618 skip_prefix(header->buf, "Cookie:", &sensitive_header)) {
619 struct strbuf redacted_header = STRBUF_INIT;
620 char *cookie;
621
622 while (isspace(*sensitive_header))
623 sensitive_header++;
624
625 /*
626 * The contents of header starting from sensitive_header will
627 * subsequently be overridden, so it is fine to mutate this
628 * string (hence the assignment to "char *").
629 */
630 cookie = (char *) sensitive_header;
631
632 while (cookie) {
633 char *equals;
634 char *semicolon = strstr(cookie, "; ");
635 if (semicolon)
636 *semicolon = 0;
637 equals = strchrnul(cookie, '=');
638 if (!equals) {
639 /* invalid cookie, just append and continue */
640 strbuf_addstr(&redacted_header, cookie);
641 continue;
642 }
643 *equals = 0; /* temporarily set to NUL for lookup */
644 if (string_list_lookup(&cookies_to_redact, cookie)) {
645 strbuf_addstr(&redacted_header, cookie);
646 strbuf_addstr(&redacted_header, "=<redacted>");
647 } else {
648 *equals = '=';
649 strbuf_addstr(&redacted_header, cookie);
650 }
651 if (semicolon) {
652 /*
653 * There are more cookies. (Or, for some
654 * reason, the input string ends in "; ".)
655 */
656 strbuf_addstr(&redacted_header, "; ");
657 cookie = semicolon + strlen("; ");
658 } else {
659 cookie = NULL;
660 }
661 }
662
663 strbuf_setlen(header, sensitive_header - header->buf);
664 strbuf_addbuf(header, &redacted_header);
665 }
666 }
667
668 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
669 {
670 struct strbuf out = STRBUF_INIT;
671 struct strbuf **headers, **header;
672
673 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
674 text, (long)size, (long)size);
675 trace_strbuf(&trace_curl, &out);
676 strbuf_reset(&out);
677 strbuf_add(&out, ptr, size);
678 headers = strbuf_split_max(&out, '\n', 0);
679
680 for (header = headers; *header; header++) {
681 if (hide_sensitive_header)
682 redact_sensitive_header(*header);
683 strbuf_insert((*header), 0, text, strlen(text));
684 strbuf_insert((*header), strlen(text), ": ", 2);
685 strbuf_rtrim((*header));
686 strbuf_addch((*header), '\n');
687 trace_strbuf(&trace_curl, (*header));
688 }
689 strbuf_list_free(headers);
690 strbuf_release(&out);
691 }
692
693 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
694 {
695 size_t i;
696 struct strbuf out = STRBUF_INIT;
697 unsigned int width = 60;
698
699 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
700 text, (long)size, (long)size);
701 trace_strbuf(&trace_curl, &out);
702
703 for (i = 0; i < size; i += width) {
704 size_t w;
705
706 strbuf_reset(&out);
707 strbuf_addf(&out, "%s: ", text);
708 for (w = 0; (w < width) && (i + w < size); w++) {
709 unsigned char ch = ptr[i + w];
710
711 strbuf_addch(&out,
712 (ch >= 0x20) && (ch < 0x80)
713 ? ch : '.');
714 }
715 strbuf_addch(&out, '\n');
716 trace_strbuf(&trace_curl, &out);
717 }
718 strbuf_release(&out);
719 }
720
721 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
722 {
723 const char *text;
724 enum { NO_FILTER = 0, DO_FILTER = 1 };
725
726 switch (type) {
727 case CURLINFO_TEXT:
728 trace_printf_key(&trace_curl, "== Info: %s", data);
729 break;
730 case CURLINFO_HEADER_OUT:
731 text = "=> Send header";
732 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
733 break;
734 case CURLINFO_DATA_OUT:
735 if (trace_curl_data) {
736 text = "=> Send data";
737 curl_dump_data(text, (unsigned char *)data, size);
738 }
739 break;
740 case CURLINFO_SSL_DATA_OUT:
741 if (trace_curl_data) {
742 text = "=> Send SSL data";
743 curl_dump_data(text, (unsigned char *)data, size);
744 }
745 break;
746 case CURLINFO_HEADER_IN:
747 text = "<= Recv header";
748 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
749 break;
750 case CURLINFO_DATA_IN:
751 if (trace_curl_data) {
752 text = "<= Recv data";
753 curl_dump_data(text, (unsigned char *)data, size);
754 }
755 break;
756 case CURLINFO_SSL_DATA_IN:
757 if (trace_curl_data) {
758 text = "<= Recv SSL data";
759 curl_dump_data(text, (unsigned char *)data, size);
760 }
761 break;
762
763 default: /* we ignore unknown types by default */
764 return 0;
765 }
766 return 0;
767 }
768
769 void setup_curl_trace(CURL *handle)
770 {
771 if (!trace_want(&trace_curl))
772 return;
773 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
774 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
775 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
776 }
777
778 #ifdef CURLPROTO_HTTP
779 static long get_curl_allowed_protocols(int from_user)
780 {
781 long allowed_protocols = 0;
782
783 if (is_transport_allowed("http", from_user))
784 allowed_protocols |= CURLPROTO_HTTP;
785 if (is_transport_allowed("https", from_user))
786 allowed_protocols |= CURLPROTO_HTTPS;
787 if (is_transport_allowed("ftp", from_user))
788 allowed_protocols |= CURLPROTO_FTP;
789 if (is_transport_allowed("ftps", from_user))
790 allowed_protocols |= CURLPROTO_FTPS;
791
792 return allowed_protocols;
793 }
794 #endif
795
796 #if LIBCURL_VERSION_NUM >=0x072f00
797 static int get_curl_http_version_opt(const char *version_string, long *opt)
798 {
799 int i;
800 static struct {
801 const char *name;
802 long opt_token;
803 } choice[] = {
804 { "HTTP/1.1", CURL_HTTP_VERSION_1_1 },
805 { "HTTP/2", CURL_HTTP_VERSION_2 }
806 };
807
808 for (i = 0; i < ARRAY_SIZE(choice); i++) {
809 if (!strcmp(version_string, choice[i].name)) {
810 *opt = choice[i].opt_token;
811 return 0;
812 }
813 }
814
815 warning("unknown value given to http.version: '%s'", version_string);
816 return -1; /* not found */
817 }
818
819 #endif
820
821 static CURL *get_curl_handle(void)
822 {
823 CURL *result = curl_easy_init();
824
825 if (!result)
826 die("curl_easy_init failed");
827
828 if (!curl_ssl_verify) {
829 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
830 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
831 } else {
832 /* Verify authenticity of the peer's certificate */
833 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
834 /* The name in the cert must match whom we tried to connect */
835 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
836 }
837
838 #if LIBCURL_VERSION_NUM >= 0x072f00 // 7.47.0
839 if (curl_http_version) {
840 long opt;
841 if (!get_curl_http_version_opt(curl_http_version, &opt)) {
842 /* Set request use http version */
843 curl_easy_setopt(result, CURLOPT_HTTP_VERSION, opt);
844 }
845 }
846 #endif
847
848 #if LIBCURL_VERSION_NUM >= 0x070907
849 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
850 #endif
851 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
852 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
853 #endif
854
855 #ifdef CURLGSSAPI_DELEGATION_FLAG
856 if (curl_deleg) {
857 int i;
858 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
859 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
860 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
861 curl_deleg_levels[i].curl_deleg_param);
862 break;
863 }
864 }
865 if (i == ARRAY_SIZE(curl_deleg_levels))
866 warning("Unknown delegation method '%s': using default",
867 curl_deleg);
868 }
869 #endif
870
871 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
872 !http_schannel_check_revoke) {
873 #if LIBCURL_VERSION_NUM >= 0x072c00
874 curl_easy_setopt(result, CURLOPT_SSL_OPTIONS, CURLSSLOPT_NO_REVOKE);
875 #else
876 warning(_("CURLSSLOPT_NO_REVOKE not supported with cURL < 7.44.0"));
877 #endif
878 }
879
880 if (http_proactive_auth)
881 init_curl_http_auth(result);
882
883 if (getenv("GIT_SSL_VERSION"))
884 ssl_version = getenv("GIT_SSL_VERSION");
885 if (ssl_version && *ssl_version) {
886 int i;
887 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
888 if (!strcmp(ssl_version, sslversions[i].name)) {
889 curl_easy_setopt(result, CURLOPT_SSLVERSION,
890 sslversions[i].ssl_version);
891 break;
892 }
893 }
894 if (i == ARRAY_SIZE(sslversions))
895 warning("unsupported ssl version %s: using default",
896 ssl_version);
897 }
898
899 if (getenv("GIT_SSL_CIPHER_LIST"))
900 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
901 if (ssl_cipherlist != NULL && *ssl_cipherlist)
902 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
903 ssl_cipherlist);
904
905 if (ssl_cert != NULL)
906 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
907 if (has_cert_password())
908 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
909 #if LIBCURL_VERSION_NUM >= 0x070903
910 if (ssl_key != NULL)
911 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
912 #endif
913 #if LIBCURL_VERSION_NUM >= 0x070908
914 if (ssl_capath != NULL)
915 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
916 #endif
917 #if LIBCURL_VERSION_NUM >= 0x072c00
918 if (ssl_pinnedkey != NULL)
919 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
920 #endif
921 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
922 !http_schannel_use_ssl_cainfo) {
923 curl_easy_setopt(result, CURLOPT_CAINFO, NULL);
924 #if LIBCURL_VERSION_NUM >= 0x073400
925 curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, NULL);
926 #endif
927 } else if (ssl_cainfo != NULL)
928 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
929
930 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
931 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
932 curl_low_speed_limit);
933 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
934 curl_low_speed_time);
935 }
936
937 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
938 #if LIBCURL_VERSION_NUM >= 0x071301
939 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
940 #elif LIBCURL_VERSION_NUM >= 0x071101
941 curl_easy_setopt(result, CURLOPT_POST301, 1);
942 #endif
943 #ifdef CURLPROTO_HTTP
944 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
945 get_curl_allowed_protocols(0));
946 curl_easy_setopt(result, CURLOPT_PROTOCOLS,
947 get_curl_allowed_protocols(-1));
948 #else
949 warning(_("Protocol restrictions not supported with cURL < 7.19.4"));
950 #endif
951 if (getenv("GIT_CURL_VERBOSE"))
952 curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
953 setup_curl_trace(result);
954 if (getenv("GIT_TRACE_CURL_NO_DATA"))
955 trace_curl_data = 0;
956 if (getenv("GIT_REDACT_COOKIES")) {
957 string_list_split(&cookies_to_redact,
958 getenv("GIT_REDACT_COOKIES"), ',', -1);
959 string_list_sort(&cookies_to_redact);
960 }
961
962 curl_easy_setopt(result, CURLOPT_USERAGENT,
963 user_agent ? user_agent : git_user_agent());
964
965 if (curl_ftp_no_epsv)
966 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
967
968 #ifdef CURLOPT_USE_SSL
969 if (curl_ssl_try)
970 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
971 #endif
972
973 /*
974 * CURL also examines these variables as a fallback; but we need to query
975 * them here in order to decide whether to prompt for missing password (cf.
976 * init_curl_proxy_auth()).
977 *
978 * Unlike many other common environment variables, these are historically
979 * lowercase only. It appears that CURL did not know this and implemented
980 * only uppercase variants, which was later corrected to take both - with
981 * the exception of http_proxy, which is lowercase only also in CURL. As
982 * the lowercase versions are the historical quasi-standard, they take
983 * precedence here, as in CURL.
984 */
985 if (!curl_http_proxy) {
986 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
987 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
988 var_override(&curl_http_proxy, getenv("https_proxy"));
989 } else {
990 var_override(&curl_http_proxy, getenv("http_proxy"));
991 }
992 if (!curl_http_proxy) {
993 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
994 var_override(&curl_http_proxy, getenv("all_proxy"));
995 }
996 }
997
998 if (curl_http_proxy && curl_http_proxy[0] == '\0') {
999 /*
1000 * Handle case with the empty http.proxy value here to keep
1001 * common code clean.
1002 * NB: empty option disables proxying at all.
1003 */
1004 curl_easy_setopt(result, CURLOPT_PROXY, "");
1005 } else if (curl_http_proxy) {
1006 #if LIBCURL_VERSION_NUM >= 0x071800
1007 if (starts_with(curl_http_proxy, "socks5h"))
1008 curl_easy_setopt(result,
1009 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
1010 else if (starts_with(curl_http_proxy, "socks5"))
1011 curl_easy_setopt(result,
1012 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
1013 else if (starts_with(curl_http_proxy, "socks4a"))
1014 curl_easy_setopt(result,
1015 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
1016 else if (starts_with(curl_http_proxy, "socks"))
1017 curl_easy_setopt(result,
1018 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
1019 #endif
1020 #if LIBCURL_VERSION_NUM >= 0x073400
1021 else if (starts_with(curl_http_proxy, "https"))
1022 curl_easy_setopt(result,
1023 CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
1024 #endif
1025 if (strstr(curl_http_proxy, "://"))
1026 credential_from_url(&proxy_auth, curl_http_proxy);
1027 else {
1028 struct strbuf url = STRBUF_INIT;
1029 strbuf_addf(&url, "http://%s", curl_http_proxy);
1030 credential_from_url(&proxy_auth, url.buf);
1031 strbuf_release(&url);
1032 }
1033
1034 if (!proxy_auth.host)
1035 die("Invalid proxy URL '%s'", curl_http_proxy);
1036
1037 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
1038 #if LIBCURL_VERSION_NUM >= 0x071304
1039 var_override(&curl_no_proxy, getenv("NO_PROXY"));
1040 var_override(&curl_no_proxy, getenv("no_proxy"));
1041 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
1042 #endif
1043 }
1044 init_curl_proxy_auth(result);
1045
1046 set_curl_keepalive(result);
1047
1048 return result;
1049 }
1050
1051 static void set_from_env(const char **var, const char *envname)
1052 {
1053 const char *val = getenv(envname);
1054 if (val)
1055 *var = val;
1056 }
1057
1058 void http_init(struct remote *remote, const char *url, int proactive_auth)
1059 {
1060 char *low_speed_limit;
1061 char *low_speed_time;
1062 char *normalized_url;
1063 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
1064
1065 config.section = "http";
1066 config.key = NULL;
1067 config.collect_fn = http_options;
1068 config.cascade_fn = git_default_config;
1069 config.cb = NULL;
1070
1071 http_is_verbose = 0;
1072 normalized_url = url_normalize(url, &config.url);
1073
1074 git_config(urlmatch_config_entry, &config);
1075 free(normalized_url);
1076
1077 #if LIBCURL_VERSION_NUM >= 0x073800
1078 if (http_ssl_backend) {
1079 const curl_ssl_backend **backends;
1080 struct strbuf buf = STRBUF_INIT;
1081 int i;
1082
1083 switch (curl_global_sslset(-1, http_ssl_backend, &backends)) {
1084 case CURLSSLSET_UNKNOWN_BACKEND:
1085 strbuf_addf(&buf, _("Unsupported SSL backend '%s'. "
1086 "Supported SSL backends:"),
1087 http_ssl_backend);
1088 for (i = 0; backends[i]; i++)
1089 strbuf_addf(&buf, "\n\t%s", backends[i]->name);
1090 die("%s", buf.buf);
1091 case CURLSSLSET_NO_BACKENDS:
1092 die(_("Could not set SSL backend to '%s': "
1093 "cURL was built without SSL backends"),
1094 http_ssl_backend);
1095 case CURLSSLSET_TOO_LATE:
1096 die(_("Could not set SSL backend to '%s': already set"),
1097 http_ssl_backend);
1098 case CURLSSLSET_OK:
1099 break; /* Okay! */
1100 }
1101 }
1102 #endif
1103
1104 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1105 die("curl_global_init failed");
1106
1107 http_proactive_auth = proactive_auth;
1108
1109 if (remote && remote->http_proxy)
1110 curl_http_proxy = xstrdup(remote->http_proxy);
1111
1112 if (remote)
1113 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
1114
1115 pragma_header = curl_slist_append(http_copy_default_headers(),
1116 "Pragma: no-cache");
1117 no_pragma_header = curl_slist_append(http_copy_default_headers(),
1118 "Pragma:");
1119
1120 #ifdef USE_CURL_MULTI
1121 {
1122 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1123 if (http_max_requests != NULL)
1124 max_requests = atoi(http_max_requests);
1125 }
1126
1127 curlm = curl_multi_init();
1128 if (!curlm)
1129 die("curl_multi_init failed");
1130 #endif
1131
1132 if (getenv("GIT_SSL_NO_VERIFY"))
1133 curl_ssl_verify = 0;
1134
1135 set_from_env(&ssl_cert, "GIT_SSL_CERT");
1136 #if LIBCURL_VERSION_NUM >= 0x070903
1137 set_from_env(&ssl_key, "GIT_SSL_KEY");
1138 #endif
1139 #if LIBCURL_VERSION_NUM >= 0x070908
1140 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
1141 #endif
1142 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
1143
1144 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
1145
1146 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1147 if (low_speed_limit != NULL)
1148 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1149 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1150 if (low_speed_time != NULL)
1151 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1152
1153 if (curl_ssl_verify == -1)
1154 curl_ssl_verify = 1;
1155
1156 curl_session_count = 0;
1157 #ifdef USE_CURL_MULTI
1158 if (max_requests < 1)
1159 max_requests = DEFAULT_MAX_REQUESTS;
1160 #endif
1161
1162 if (getenv("GIT_CURL_FTP_NO_EPSV"))
1163 curl_ftp_no_epsv = 1;
1164
1165 if (url) {
1166 credential_from_url(&http_auth, url);
1167 if (!ssl_cert_password_required &&
1168 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1169 starts_with(url, "https://"))
1170 ssl_cert_password_required = 1;
1171 }
1172
1173 #ifndef NO_CURL_EASY_DUPHANDLE
1174 curl_default = get_curl_handle();
1175 #endif
1176 }
1177
1178 void http_cleanup(void)
1179 {
1180 struct active_request_slot *slot = active_queue_head;
1181
1182 while (slot != NULL) {
1183 struct active_request_slot *next = slot->next;
1184 if (slot->curl != NULL) {
1185 xmulti_remove_handle(slot);
1186 curl_easy_cleanup(slot->curl);
1187 }
1188 free(slot);
1189 slot = next;
1190 }
1191 active_queue_head = NULL;
1192
1193 #ifndef NO_CURL_EASY_DUPHANDLE
1194 curl_easy_cleanup(curl_default);
1195 #endif
1196
1197 #ifdef USE_CURL_MULTI
1198 curl_multi_cleanup(curlm);
1199 #endif
1200 curl_global_cleanup();
1201
1202 curl_slist_free_all(extra_http_headers);
1203 extra_http_headers = NULL;
1204
1205 curl_slist_free_all(pragma_header);
1206 pragma_header = NULL;
1207
1208 curl_slist_free_all(no_pragma_header);
1209 no_pragma_header = NULL;
1210
1211 if (curl_http_proxy) {
1212 free((void *)curl_http_proxy);
1213 curl_http_proxy = NULL;
1214 }
1215
1216 if (proxy_auth.password) {
1217 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1218 FREE_AND_NULL(proxy_auth.password);
1219 }
1220
1221 free((void *)curl_proxyuserpwd);
1222 curl_proxyuserpwd = NULL;
1223
1224 free((void *)http_proxy_authmethod);
1225 http_proxy_authmethod = NULL;
1226
1227 if (cert_auth.password != NULL) {
1228 memset(cert_auth.password, 0, strlen(cert_auth.password));
1229 FREE_AND_NULL(cert_auth.password);
1230 }
1231 ssl_cert_password_required = 0;
1232
1233 FREE_AND_NULL(cached_accept_language);
1234 }
1235
1236 struct active_request_slot *get_active_slot(void)
1237 {
1238 struct active_request_slot *slot = active_queue_head;
1239 struct active_request_slot *newslot;
1240
1241 #ifdef USE_CURL_MULTI
1242 int num_transfers;
1243
1244 /* Wait for a slot to open up if the queue is full */
1245 while (active_requests >= max_requests) {
1246 curl_multi_perform(curlm, &num_transfers);
1247 if (num_transfers < active_requests)
1248 process_curl_messages();
1249 }
1250 #endif
1251
1252 while (slot != NULL && slot->in_use)
1253 slot = slot->next;
1254
1255 if (slot == NULL) {
1256 newslot = xmalloc(sizeof(*newslot));
1257 newslot->curl = NULL;
1258 newslot->in_use = 0;
1259 newslot->next = NULL;
1260
1261 slot = active_queue_head;
1262 if (slot == NULL) {
1263 active_queue_head = newslot;
1264 } else {
1265 while (slot->next != NULL)
1266 slot = slot->next;
1267 slot->next = newslot;
1268 }
1269 slot = newslot;
1270 }
1271
1272 if (slot->curl == NULL) {
1273 #ifdef NO_CURL_EASY_DUPHANDLE
1274 slot->curl = get_curl_handle();
1275 #else
1276 slot->curl = curl_easy_duphandle(curl_default);
1277 #endif
1278 curl_session_count++;
1279 }
1280
1281 active_requests++;
1282 slot->in_use = 1;
1283 slot->results = NULL;
1284 slot->finished = NULL;
1285 slot->callback_data = NULL;
1286 slot->callback_func = NULL;
1287 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1288 if (curl_save_cookies)
1289 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1290 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1291 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1292 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1293 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1294 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1295 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1296 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1297 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1298 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1299 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1300
1301 /*
1302 * Default following to off unless "ALWAYS" is configured; this gives
1303 * callers a sane starting point, and they can tweak for individual
1304 * HTTP_FOLLOW_* cases themselves.
1305 */
1306 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1307 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1308 else
1309 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1310
1311 #if LIBCURL_VERSION_NUM >= 0x070a08
1312 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1313 #endif
1314 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1315 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1316 #endif
1317 if (http_auth.password || curl_empty_auth_enabled())
1318 init_curl_http_auth(slot->curl);
1319
1320 return slot;
1321 }
1322
1323 int start_active_slot(struct active_request_slot *slot)
1324 {
1325 #ifdef USE_CURL_MULTI
1326 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1327 int num_transfers;
1328
1329 if (curlm_result != CURLM_OK &&
1330 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1331 warning("curl_multi_add_handle failed: %s",
1332 curl_multi_strerror(curlm_result));
1333 active_requests--;
1334 slot->in_use = 0;
1335 return 0;
1336 }
1337
1338 /*
1339 * We know there must be something to do, since we just added
1340 * something.
1341 */
1342 curl_multi_perform(curlm, &num_transfers);
1343 #endif
1344 return 1;
1345 }
1346
1347 #ifdef USE_CURL_MULTI
1348 struct fill_chain {
1349 void *data;
1350 int (*fill)(void *);
1351 struct fill_chain *next;
1352 };
1353
1354 static struct fill_chain *fill_cfg;
1355
1356 void add_fill_function(void *data, int (*fill)(void *))
1357 {
1358 struct fill_chain *new_fill = xmalloc(sizeof(*new_fill));
1359 struct fill_chain **linkp = &fill_cfg;
1360 new_fill->data = data;
1361 new_fill->fill = fill;
1362 new_fill->next = NULL;
1363 while (*linkp)
1364 linkp = &(*linkp)->next;
1365 *linkp = new_fill;
1366 }
1367
1368 void fill_active_slots(void)
1369 {
1370 struct active_request_slot *slot = active_queue_head;
1371
1372 while (active_requests < max_requests) {
1373 struct fill_chain *fill;
1374 for (fill = fill_cfg; fill; fill = fill->next)
1375 if (fill->fill(fill->data))
1376 break;
1377
1378 if (!fill)
1379 break;
1380 }
1381
1382 while (slot != NULL) {
1383 if (!slot->in_use && slot->curl != NULL
1384 && curl_session_count > min_curl_sessions) {
1385 curl_easy_cleanup(slot->curl);
1386 slot->curl = NULL;
1387 curl_session_count--;
1388 }
1389 slot = slot->next;
1390 }
1391 }
1392
1393 void step_active_slots(void)
1394 {
1395 int num_transfers;
1396 CURLMcode curlm_result;
1397
1398 do {
1399 curlm_result = curl_multi_perform(curlm, &num_transfers);
1400 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1401 if (num_transfers < active_requests) {
1402 process_curl_messages();
1403 fill_active_slots();
1404 }
1405 }
1406 #endif
1407
1408 void run_active_slot(struct active_request_slot *slot)
1409 {
1410 #ifdef USE_CURL_MULTI
1411 fd_set readfds;
1412 fd_set writefds;
1413 fd_set excfds;
1414 int max_fd;
1415 struct timeval select_timeout;
1416 int finished = 0;
1417
1418 slot->finished = &finished;
1419 while (!finished) {
1420 step_active_slots();
1421
1422 if (slot->in_use) {
1423 #if LIBCURL_VERSION_NUM >= 0x070f04
1424 long curl_timeout;
1425 curl_multi_timeout(curlm, &curl_timeout);
1426 if (curl_timeout == 0) {
1427 continue;
1428 } else if (curl_timeout == -1) {
1429 select_timeout.tv_sec = 0;
1430 select_timeout.tv_usec = 50000;
1431 } else {
1432 select_timeout.tv_sec = curl_timeout / 1000;
1433 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1434 }
1435 #else
1436 select_timeout.tv_sec = 0;
1437 select_timeout.tv_usec = 50000;
1438 #endif
1439
1440 max_fd = -1;
1441 FD_ZERO(&readfds);
1442 FD_ZERO(&writefds);
1443 FD_ZERO(&excfds);
1444 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1445
1446 /*
1447 * It can happen that curl_multi_timeout returns a pathologically
1448 * long timeout when curl_multi_fdset returns no file descriptors
1449 * to read. See commit message for more details.
1450 */
1451 if (max_fd < 0 &&
1452 (select_timeout.tv_sec > 0 ||
1453 select_timeout.tv_usec > 50000)) {
1454 select_timeout.tv_sec = 0;
1455 select_timeout.tv_usec = 50000;
1456 }
1457
1458 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1459 }
1460 }
1461 #else
1462 while (slot->in_use) {
1463 slot->curl_result = curl_easy_perform(slot->curl);
1464 finish_active_slot(slot);
1465 }
1466 #endif
1467 }
1468
1469 static void release_active_slot(struct active_request_slot *slot)
1470 {
1471 closedown_active_slot(slot);
1472 if (slot->curl) {
1473 xmulti_remove_handle(slot);
1474 if (curl_session_count > min_curl_sessions) {
1475 curl_easy_cleanup(slot->curl);
1476 slot->curl = NULL;
1477 curl_session_count--;
1478 }
1479 }
1480 #ifdef USE_CURL_MULTI
1481 fill_active_slots();
1482 #endif
1483 }
1484
1485 void finish_all_active_slots(void)
1486 {
1487 struct active_request_slot *slot = active_queue_head;
1488
1489 while (slot != NULL)
1490 if (slot->in_use) {
1491 run_active_slot(slot);
1492 slot = active_queue_head;
1493 } else {
1494 slot = slot->next;
1495 }
1496 }
1497
1498 /* Helpers for modifying and creating URLs */
1499 static inline int needs_quote(int ch)
1500 {
1501 if (((ch >= 'A') && (ch <= 'Z'))
1502 || ((ch >= 'a') && (ch <= 'z'))
1503 || ((ch >= '0') && (ch <= '9'))
1504 || (ch == '/')
1505 || (ch == '-')
1506 || (ch == '.'))
1507 return 0;
1508 return 1;
1509 }
1510
1511 static char *quote_ref_url(const char *base, const char *ref)
1512 {
1513 struct strbuf buf = STRBUF_INIT;
1514 const char *cp;
1515 int ch;
1516
1517 end_url_with_slash(&buf, base);
1518
1519 for (cp = ref; (ch = *cp) != 0; cp++)
1520 if (needs_quote(ch))
1521 strbuf_addf(&buf, "%%%02x", ch);
1522 else
1523 strbuf_addch(&buf, *cp);
1524
1525 return strbuf_detach(&buf, NULL);
1526 }
1527
1528 void append_remote_object_url(struct strbuf *buf, const char *url,
1529 const char *hex,
1530 int only_two_digit_prefix)
1531 {
1532 end_url_with_slash(buf, url);
1533
1534 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1535 if (!only_two_digit_prefix)
1536 strbuf_addstr(buf, hex + 2);
1537 }
1538
1539 char *get_remote_object_url(const char *url, const char *hex,
1540 int only_two_digit_prefix)
1541 {
1542 struct strbuf buf = STRBUF_INIT;
1543 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1544 return strbuf_detach(&buf, NULL);
1545 }
1546
1547 void normalize_curl_result(CURLcode *result, long http_code,
1548 char *errorstr, size_t errorlen)
1549 {
1550 /*
1551 * If we see a failing http code with CURLE_OK, we have turned off
1552 * FAILONERROR (to keep the server's custom error response), and should
1553 * translate the code into failure here.
1554 *
1555 * Likewise, if we see a redirect (30x code), that means we turned off
1556 * redirect-following, and we should treat the result as an error.
1557 */
1558 if (*result == CURLE_OK && http_code >= 300) {
1559 *result = CURLE_HTTP_RETURNED_ERROR;
1560 /*
1561 * Normally curl will already have put the "reason phrase"
1562 * from the server into curl_errorstr; unfortunately without
1563 * FAILONERROR it is lost, so we can give only the numeric
1564 * status code.
1565 */
1566 xsnprintf(errorstr, errorlen,
1567 "The requested URL returned error: %ld",
1568 http_code);
1569 }
1570 }
1571
1572 static int handle_curl_result(struct slot_results *results)
1573 {
1574 normalize_curl_result(&results->curl_result, results->http_code,
1575 curl_errorstr, sizeof(curl_errorstr));
1576
1577 if (results->curl_result == CURLE_OK) {
1578 credential_approve(&http_auth);
1579 if (proxy_auth.password)
1580 credential_approve(&proxy_auth);
1581 return HTTP_OK;
1582 } else if (missing_target(results))
1583 return HTTP_MISSING_TARGET;
1584 else if (results->http_code == 401) {
1585 if (http_auth.username && http_auth.password) {
1586 credential_reject(&http_auth);
1587 return HTTP_NOAUTH;
1588 } else {
1589 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1590 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1591 if (results->auth_avail) {
1592 http_auth_methods &= results->auth_avail;
1593 http_auth_methods_restricted = 1;
1594 }
1595 #endif
1596 return HTTP_REAUTH;
1597 }
1598 } else {
1599 if (results->http_connectcode == 407)
1600 credential_reject(&proxy_auth);
1601 #if LIBCURL_VERSION_NUM >= 0x070c00
1602 if (!curl_errorstr[0])
1603 strlcpy(curl_errorstr,
1604 curl_easy_strerror(results->curl_result),
1605 sizeof(curl_errorstr));
1606 #endif
1607 return HTTP_ERROR;
1608 }
1609 }
1610
1611 int run_one_slot(struct active_request_slot *slot,
1612 struct slot_results *results)
1613 {
1614 slot->results = results;
1615 if (!start_active_slot(slot)) {
1616 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1617 "failed to start HTTP request");
1618 return HTTP_START_FAILED;
1619 }
1620
1621 run_active_slot(slot);
1622 return handle_curl_result(results);
1623 }
1624
1625 struct curl_slist *http_copy_default_headers(void)
1626 {
1627 struct curl_slist *headers = NULL, *h;
1628
1629 for (h = extra_http_headers; h; h = h->next)
1630 headers = curl_slist_append(headers, h->data);
1631
1632 return headers;
1633 }
1634
1635 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1636 {
1637 char *ptr;
1638 CURLcode ret;
1639
1640 strbuf_reset(buf);
1641 ret = curl_easy_getinfo(curl, info, &ptr);
1642 if (!ret && ptr)
1643 strbuf_addstr(buf, ptr);
1644 return ret;
1645 }
1646
1647 /*
1648 * Check for and extract a content-type parameter. "raw"
1649 * should be positioned at the start of the potential
1650 * parameter, with any whitespace already removed.
1651 *
1652 * "name" is the name of the parameter. The value is appended
1653 * to "out".
1654 */
1655 static int extract_param(const char *raw, const char *name,
1656 struct strbuf *out)
1657 {
1658 size_t len = strlen(name);
1659
1660 if (strncasecmp(raw, name, len))
1661 return -1;
1662 raw += len;
1663
1664 if (*raw != '=')
1665 return -1;
1666 raw++;
1667
1668 while (*raw && !isspace(*raw) && *raw != ';')
1669 strbuf_addch(out, *raw++);
1670 return 0;
1671 }
1672
1673 /*
1674 * Extract a normalized version of the content type, with any
1675 * spaces suppressed, all letters lowercased, and no trailing ";"
1676 * or parameters.
1677 *
1678 * Note that we will silently remove even invalid whitespace. For
1679 * example, "text / plain" is specifically forbidden by RFC 2616,
1680 * but "text/plain" is the only reasonable output, and this keeps
1681 * our code simple.
1682 *
1683 * If the "charset" argument is not NULL, store the value of any
1684 * charset parameter there.
1685 *
1686 * Example:
1687 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1688 * "text / plain" -> "text/plain"
1689 */
1690 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1691 struct strbuf *charset)
1692 {
1693 const char *p;
1694
1695 strbuf_reset(type);
1696 strbuf_grow(type, raw->len);
1697 for (p = raw->buf; *p; p++) {
1698 if (isspace(*p))
1699 continue;
1700 if (*p == ';') {
1701 p++;
1702 break;
1703 }
1704 strbuf_addch(type, tolower(*p));
1705 }
1706
1707 if (!charset)
1708 return;
1709
1710 strbuf_reset(charset);
1711 while (*p) {
1712 while (isspace(*p) || *p == ';')
1713 p++;
1714 if (!extract_param(p, "charset", charset))
1715 return;
1716 while (*p && !isspace(*p))
1717 p++;
1718 }
1719
1720 if (!charset->len && starts_with(type->buf, "text/"))
1721 strbuf_addstr(charset, "ISO-8859-1");
1722 }
1723
1724 static void write_accept_language(struct strbuf *buf)
1725 {
1726 /*
1727 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1728 * that, q-value will be smaller than 0.001, the minimum q-value the
1729 * HTTP specification allows. See
1730 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1731 */
1732 const int MAX_DECIMAL_PLACES = 3;
1733 const int MAX_LANGUAGE_TAGS = 1000;
1734 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1735 char **language_tags = NULL;
1736 int num_langs = 0;
1737 const char *s = get_preferred_languages();
1738 int i;
1739 struct strbuf tag = STRBUF_INIT;
1740
1741 /* Don't add Accept-Language header if no language is preferred. */
1742 if (!s)
1743 return;
1744
1745 /*
1746 * Split the colon-separated string of preferred languages into
1747 * language_tags array.
1748 */
1749 do {
1750 /* collect language tag */
1751 for (; *s && (isalnum(*s) || *s == '_'); s++)
1752 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1753
1754 /* skip .codeset, @modifier and any other unnecessary parts */
1755 while (*s && *s != ':')
1756 s++;
1757
1758 if (tag.len) {
1759 num_langs++;
1760 REALLOC_ARRAY(language_tags, num_langs);
1761 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1762 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1763 break;
1764 }
1765 } while (*s++);
1766
1767 /* write Accept-Language header into buf */
1768 if (num_langs) {
1769 int last_buf_len = 0;
1770 int max_q;
1771 int decimal_places;
1772 char q_format[32];
1773
1774 /* add '*' */
1775 REALLOC_ARRAY(language_tags, num_langs + 1);
1776 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1777
1778 /* compute decimal_places */
1779 for (max_q = 1, decimal_places = 0;
1780 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1781 decimal_places++, max_q *= 10)
1782 ;
1783
1784 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1785
1786 strbuf_addstr(buf, "Accept-Language: ");
1787
1788 for (i = 0; i < num_langs; i++) {
1789 if (i > 0)
1790 strbuf_addstr(buf, ", ");
1791
1792 strbuf_addstr(buf, language_tags[i]);
1793
1794 if (i > 0)
1795 strbuf_addf(buf, q_format, max_q - i);
1796
1797 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1798 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1799 break;
1800 }
1801
1802 last_buf_len = buf->len;
1803 }
1804 }
1805
1806 /* free language tags -- last one is a static '*' */
1807 for (i = 0; i < num_langs - 1; i++)
1808 free(language_tags[i]);
1809 free(language_tags);
1810 }
1811
1812 /*
1813 * Get an Accept-Language header which indicates user's preferred languages.
1814 *
1815 * Examples:
1816 * LANGUAGE= -> ""
1817 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1818 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1819 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1820 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1821 * LANGUAGE= LANG=C -> ""
1822 */
1823 static const char *get_accept_language(void)
1824 {
1825 if (!cached_accept_language) {
1826 struct strbuf buf = STRBUF_INIT;
1827 write_accept_language(&buf);
1828 if (buf.len > 0)
1829 cached_accept_language = strbuf_detach(&buf, NULL);
1830 }
1831
1832 return cached_accept_language;
1833 }
1834
1835 static void http_opt_request_remainder(CURL *curl, off_t pos)
1836 {
1837 char buf[128];
1838 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1839 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1840 }
1841
1842 /* http_request() targets */
1843 #define HTTP_REQUEST_STRBUF 0
1844 #define HTTP_REQUEST_FILE 1
1845
1846 static int http_request(const char *url,
1847 void *result, int target,
1848 const struct http_get_options *options)
1849 {
1850 struct active_request_slot *slot;
1851 struct slot_results results;
1852 struct curl_slist *headers = http_copy_default_headers();
1853 struct strbuf buf = STRBUF_INIT;
1854 const char *accept_language;
1855 int ret;
1856
1857 slot = get_active_slot();
1858 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1859
1860 if (result == NULL) {
1861 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1862 } else {
1863 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1864 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1865
1866 if (target == HTTP_REQUEST_FILE) {
1867 off_t posn = ftello(result);
1868 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1869 fwrite);
1870 if (posn > 0)
1871 http_opt_request_remainder(slot->curl, posn);
1872 } else
1873 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1874 fwrite_buffer);
1875 }
1876
1877 accept_language = get_accept_language();
1878
1879 if (accept_language)
1880 headers = curl_slist_append(headers, accept_language);
1881
1882 strbuf_addstr(&buf, "Pragma:");
1883 if (options && options->no_cache)
1884 strbuf_addstr(&buf, " no-cache");
1885 if (options && options->initial_request &&
1886 http_follow_config == HTTP_FOLLOW_INITIAL)
1887 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1888
1889 headers = curl_slist_append(headers, buf.buf);
1890
1891 /* Add additional headers here */
1892 if (options && options->extra_headers) {
1893 const struct string_list_item *item;
1894 for_each_string_list_item(item, options->extra_headers) {
1895 headers = curl_slist_append(headers, item->string);
1896 }
1897 }
1898
1899 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1900 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1901 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1902 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1903
1904 ret = run_one_slot(slot, &results);
1905
1906 if (options && options->content_type) {
1907 struct strbuf raw = STRBUF_INIT;
1908 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1909 extract_content_type(&raw, options->content_type,
1910 options->charset);
1911 strbuf_release(&raw);
1912 }
1913
1914 if (options && options->effective_url)
1915 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1916 options->effective_url);
1917
1918 curl_slist_free_all(headers);
1919 strbuf_release(&buf);
1920
1921 return ret;
1922 }
1923
1924 /*
1925 * Update the "base" url to a more appropriate value, as deduced by
1926 * redirects seen when requesting a URL starting with "url".
1927 *
1928 * The "asked" parameter is a URL that we asked curl to access, and must begin
1929 * with "base".
1930 *
1931 * The "got" parameter is the URL that curl reported to us as where we ended
1932 * up.
1933 *
1934 * Returns 1 if we updated the base url, 0 otherwise.
1935 *
1936 * Our basic strategy is to compare "base" and "asked" to find the bits
1937 * specific to our request. We then strip those bits off of "got" to yield the
1938 * new base. So for example, if our base is "http://example.com/foo.git",
1939 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1940 * with "https://other.example.com/foo.git/info/refs". We would want the
1941 * new URL to become "https://other.example.com/foo.git".
1942 *
1943 * Note that this assumes a sane redirect scheme. It's entirely possible
1944 * in the example above to end up at a URL that does not even end in
1945 * "info/refs". In such a case we die. There's not much we can do, such a
1946 * scheme is unlikely to represent a real git repository, and failing to
1947 * rewrite the base opens options for malicious redirects to do funny things.
1948 */
1949 static int update_url_from_redirect(struct strbuf *base,
1950 const char *asked,
1951 const struct strbuf *got)
1952 {
1953 const char *tail;
1954 size_t new_len;
1955
1956 if (!strcmp(asked, got->buf))
1957 return 0;
1958
1959 if (!skip_prefix(asked, base->buf, &tail))
1960 BUG("update_url_from_redirect: %s is not a superset of %s",
1961 asked, base->buf);
1962
1963 new_len = got->len;
1964 if (!strip_suffix_mem(got->buf, &new_len, tail))
1965 die(_("unable to update url base from redirection:\n"
1966 " asked for: %s\n"
1967 " redirect: %s"),
1968 asked, got->buf);
1969
1970 strbuf_reset(base);
1971 strbuf_add(base, got->buf, new_len);
1972
1973 return 1;
1974 }
1975
1976 static int http_request_reauth(const char *url,
1977 void *result, int target,
1978 struct http_get_options *options)
1979 {
1980 int ret = http_request(url, result, target, options);
1981
1982 if (ret != HTTP_OK && ret != HTTP_REAUTH)
1983 return ret;
1984
1985 if (options && options->effective_url && options->base_url) {
1986 if (update_url_from_redirect(options->base_url,
1987 url, options->effective_url)) {
1988 credential_from_url(&http_auth, options->base_url->buf);
1989 url = options->effective_url->buf;
1990 }
1991 }
1992
1993 if (ret != HTTP_REAUTH)
1994 return ret;
1995
1996 /*
1997 * The previous request may have put cruft into our output stream; we
1998 * should clear it out before making our next request.
1999 */
2000 switch (target) {
2001 case HTTP_REQUEST_STRBUF:
2002 strbuf_reset(result);
2003 break;
2004 case HTTP_REQUEST_FILE:
2005 if (fflush(result)) {
2006 error_errno("unable to flush a file");
2007 return HTTP_START_FAILED;
2008 }
2009 rewind(result);
2010 if (ftruncate(fileno(result), 0) < 0) {
2011 error_errno("unable to truncate a file");
2012 return HTTP_START_FAILED;
2013 }
2014 break;
2015 default:
2016 BUG("Unknown http_request target");
2017 }
2018
2019 credential_fill(&http_auth);
2020
2021 return http_request(url, result, target, options);
2022 }
2023
2024 int http_get_strbuf(const char *url,
2025 struct strbuf *result,
2026 struct http_get_options *options)
2027 {
2028 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
2029 }
2030
2031 /*
2032 * Downloads a URL and stores the result in the given file.
2033 *
2034 * If a previous interrupted download is detected (i.e. a previous temporary
2035 * file is still around) the download is resumed.
2036 */
2037 static int http_get_file(const char *url, const char *filename,
2038 struct http_get_options *options)
2039 {
2040 int ret;
2041 struct strbuf tmpfile = STRBUF_INIT;
2042 FILE *result;
2043
2044 strbuf_addf(&tmpfile, "%s.temp", filename);
2045 result = fopen(tmpfile.buf, "a");
2046 if (!result) {
2047 error("Unable to open local file %s", tmpfile.buf);
2048 ret = HTTP_ERROR;
2049 goto cleanup;
2050 }
2051
2052 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
2053 fclose(result);
2054
2055 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
2056 ret = HTTP_ERROR;
2057 cleanup:
2058 strbuf_release(&tmpfile);
2059 return ret;
2060 }
2061
2062 int http_fetch_ref(const char *base, struct ref *ref)
2063 {
2064 struct http_get_options options = {0};
2065 char *url;
2066 struct strbuf buffer = STRBUF_INIT;
2067 int ret = -1;
2068
2069 options.no_cache = 1;
2070
2071 url = quote_ref_url(base, ref->name);
2072 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
2073 strbuf_rtrim(&buffer);
2074 if (buffer.len == the_hash_algo->hexsz)
2075 ret = get_oid_hex(buffer.buf, &ref->old_oid);
2076 else if (starts_with(buffer.buf, "ref: ")) {
2077 ref->symref = xstrdup(buffer.buf + 5);
2078 ret = 0;
2079 }
2080 }
2081
2082 strbuf_release(&buffer);
2083 free(url);
2084 return ret;
2085 }
2086
2087 /* Helpers for fetching packs */
2088 static char *fetch_pack_index(unsigned char *hash, const char *base_url)
2089 {
2090 char *url, *tmp;
2091 struct strbuf buf = STRBUF_INIT;
2092
2093 if (http_is_verbose)
2094 fprintf(stderr, "Getting index for pack %s\n", hash_to_hex(hash));
2095
2096 end_url_with_slash(&buf, base_url);
2097 strbuf_addf(&buf, "objects/pack/pack-%s.idx", hash_to_hex(hash));
2098 url = strbuf_detach(&buf, NULL);
2099
2100 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(hash));
2101 tmp = strbuf_detach(&buf, NULL);
2102
2103 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
2104 error("Unable to get pack index %s", url);
2105 FREE_AND_NULL(tmp);
2106 }
2107
2108 free(url);
2109 return tmp;
2110 }
2111
2112 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
2113 unsigned char *sha1, const char *base_url)
2114 {
2115 struct packed_git *new_pack;
2116 char *tmp_idx = NULL;
2117 int ret;
2118
2119 if (has_pack_index(sha1)) {
2120 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
2121 if (!new_pack)
2122 return -1; /* parse_pack_index() already issued error message */
2123 goto add_pack;
2124 }
2125
2126 tmp_idx = fetch_pack_index(sha1, base_url);
2127 if (!tmp_idx)
2128 return -1;
2129
2130 new_pack = parse_pack_index(sha1, tmp_idx);
2131 if (!new_pack) {
2132 unlink(tmp_idx);
2133 free(tmp_idx);
2134
2135 return -1; /* parse_pack_index() already issued error message */
2136 }
2137
2138 ret = verify_pack_index(new_pack);
2139 if (!ret) {
2140 close_pack_index(new_pack);
2141 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
2142 }
2143 free(tmp_idx);
2144 if (ret)
2145 return -1;
2146
2147 add_pack:
2148 new_pack->next = *packs_head;
2149 *packs_head = new_pack;
2150 return 0;
2151 }
2152
2153 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
2154 {
2155 struct http_get_options options = {0};
2156 int ret = 0;
2157 char *url;
2158 const char *data;
2159 struct strbuf buf = STRBUF_INIT;
2160 struct object_id oid;
2161
2162 end_url_with_slash(&buf, base_url);
2163 strbuf_addstr(&buf, "objects/info/packs");
2164 url = strbuf_detach(&buf, NULL);
2165
2166 options.no_cache = 1;
2167 ret = http_get_strbuf(url, &buf, &options);
2168 if (ret != HTTP_OK)
2169 goto cleanup;
2170
2171 data = buf.buf;
2172 while (*data) {
2173 if (skip_prefix(data, "P pack-", &data) &&
2174 !parse_oid_hex(data, &oid, &data) &&
2175 skip_prefix(data, ".pack", &data) &&
2176 (*data == '\n' || *data == '\0')) {
2177 fetch_and_setup_pack_index(packs_head, oid.hash, base_url);
2178 } else {
2179 data = strchrnul(data, '\n');
2180 }
2181 if (*data)
2182 data++; /* skip past newline */
2183 }
2184
2185 cleanup:
2186 free(url);
2187 return ret;
2188 }
2189
2190 void release_http_pack_request(struct http_pack_request *preq)
2191 {
2192 if (preq->packfile != NULL) {
2193 fclose(preq->packfile);
2194 preq->packfile = NULL;
2195 }
2196 preq->slot = NULL;
2197 strbuf_release(&preq->tmpfile);
2198 free(preq->url);
2199 free(preq);
2200 }
2201
2202 int finish_http_pack_request(struct http_pack_request *preq)
2203 {
2204 struct packed_git **lst;
2205 struct packed_git *p = preq->target;
2206 char *tmp_idx;
2207 size_t len;
2208 struct child_process ip = CHILD_PROCESS_INIT;
2209
2210 close_pack_index(p);
2211
2212 fclose(preq->packfile);
2213 preq->packfile = NULL;
2214
2215 lst = preq->lst;
2216 while (*lst != p)
2217 lst = &((*lst)->next);
2218 *lst = (*lst)->next;
2219
2220 if (!strip_suffix(preq->tmpfile.buf, ".pack.temp", &len))
2221 BUG("pack tmpfile does not end in .pack.temp?");
2222 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile.buf);
2223
2224 argv_array_push(&ip.args, "index-pack");
2225 argv_array_pushl(&ip.args, "-o", tmp_idx, NULL);
2226 argv_array_push(&ip.args, preq->tmpfile.buf);
2227 ip.git_cmd = 1;
2228 ip.no_stdin = 1;
2229 ip.no_stdout = 1;
2230
2231 if (run_command(&ip)) {
2232 unlink(preq->tmpfile.buf);
2233 unlink(tmp_idx);
2234 free(tmp_idx);
2235 return -1;
2236 }
2237
2238 unlink(sha1_pack_index_name(p->hash));
2239
2240 if (finalize_object_file(preq->tmpfile.buf, sha1_pack_name(p->hash))
2241 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->hash))) {
2242 free(tmp_idx);
2243 return -1;
2244 }
2245
2246 install_packed_git(the_repository, p);
2247 free(tmp_idx);
2248 return 0;
2249 }
2250
2251 struct http_pack_request *new_http_pack_request(
2252 struct packed_git *target, const char *base_url)
2253 {
2254 off_t prev_posn = 0;
2255 struct strbuf buf = STRBUF_INIT;
2256 struct http_pack_request *preq;
2257
2258 preq = xcalloc(1, sizeof(*preq));
2259 strbuf_init(&preq->tmpfile, 0);
2260 preq->target = target;
2261
2262 end_url_with_slash(&buf, base_url);
2263 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2264 hash_to_hex(target->hash));
2265 preq->url = strbuf_detach(&buf, NULL);
2266
2267 strbuf_addf(&preq->tmpfile, "%s.temp", sha1_pack_name(target->hash));
2268 preq->packfile = fopen(preq->tmpfile.buf, "a");
2269 if (!preq->packfile) {
2270 error("Unable to open local file %s for pack",
2271 preq->tmpfile.buf);
2272 goto abort;
2273 }
2274
2275 preq->slot = get_active_slot();
2276 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2277 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2278 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2279 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2280 no_pragma_header);
2281
2282 /*
2283 * If there is data present from a previous transfer attempt,
2284 * resume where it left off
2285 */
2286 prev_posn = ftello(preq->packfile);
2287 if (prev_posn>0) {
2288 if (http_is_verbose)
2289 fprintf(stderr,
2290 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2291 hash_to_hex(target->hash),
2292 (uintmax_t)prev_posn);
2293 http_opt_request_remainder(preq->slot->curl, prev_posn);
2294 }
2295
2296 return preq;
2297
2298 abort:
2299 strbuf_release(&preq->tmpfile);
2300 free(preq->url);
2301 free(preq);
2302 return NULL;
2303 }
2304
2305 /* Helpers for fetching objects (loose) */
2306 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2307 void *data)
2308 {
2309 unsigned char expn[4096];
2310 size_t size = eltsize * nmemb;
2311 int posn = 0;
2312 struct http_object_request *freq = data;
2313 struct active_request_slot *slot = freq->slot;
2314
2315 if (slot) {
2316 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2317 &slot->http_code);
2318 if (c != CURLE_OK)
2319 BUG("curl_easy_getinfo for HTTP code failed: %s",
2320 curl_easy_strerror(c));
2321 if (slot->http_code >= 300)
2322 return nmemb;
2323 }
2324
2325 do {
2326 ssize_t retval = xwrite(freq->localfile,
2327 (char *) ptr + posn, size - posn);
2328 if (retval < 0)
2329 return posn / eltsize;
2330 posn += retval;
2331 } while (posn < size);
2332
2333 freq->stream.avail_in = size;
2334 freq->stream.next_in = (void *)ptr;
2335 do {
2336 freq->stream.next_out = expn;
2337 freq->stream.avail_out = sizeof(expn);
2338 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2339 the_hash_algo->update_fn(&freq->c, expn,
2340 sizeof(expn) - freq->stream.avail_out);
2341 } while (freq->stream.avail_in && freq->zret == Z_OK);
2342 return nmemb;
2343 }
2344
2345 struct http_object_request *new_http_object_request(const char *base_url,
2346 const struct object_id *oid)
2347 {
2348 char *hex = oid_to_hex(oid);
2349 struct strbuf filename = STRBUF_INIT;
2350 struct strbuf prevfile = STRBUF_INIT;
2351 int prevlocal;
2352 char prev_buf[PREV_BUF_SIZE];
2353 ssize_t prev_read = 0;
2354 off_t prev_posn = 0;
2355 struct http_object_request *freq;
2356
2357 freq = xcalloc(1, sizeof(*freq));
2358 strbuf_init(&freq->tmpfile, 0);
2359 oidcpy(&freq->oid, oid);
2360 freq->localfile = -1;
2361
2362 loose_object_path(the_repository, &filename, oid);
2363 strbuf_addf(&freq->tmpfile, "%s.temp", filename.buf);
2364
2365 strbuf_addf(&prevfile, "%s.prev", filename.buf);
2366 unlink_or_warn(prevfile.buf);
2367 rename(freq->tmpfile.buf, prevfile.buf);
2368 unlink_or_warn(freq->tmpfile.buf);
2369 strbuf_release(&filename);
2370
2371 if (freq->localfile != -1)
2372 error("fd leakage in start: %d", freq->localfile);
2373 freq->localfile = open(freq->tmpfile.buf,
2374 O_WRONLY | O_CREAT | O_EXCL, 0666);
2375 /*
2376 * This could have failed due to the "lazy directory creation";
2377 * try to mkdir the last path component.
2378 */
2379 if (freq->localfile < 0 && errno == ENOENT) {
2380 char *dir = strrchr(freq->tmpfile.buf, '/');
2381 if (dir) {
2382 *dir = 0;
2383 mkdir(freq->tmpfile.buf, 0777);
2384 *dir = '/';
2385 }
2386 freq->localfile = open(freq->tmpfile.buf,
2387 O_WRONLY | O_CREAT | O_EXCL, 0666);
2388 }
2389
2390 if (freq->localfile < 0) {
2391 error_errno("Couldn't create temporary file %s",
2392 freq->tmpfile.buf);
2393 goto abort;
2394 }
2395
2396 git_inflate_init(&freq->stream);
2397
2398 the_hash_algo->init_fn(&freq->c);
2399
2400 freq->url = get_remote_object_url(base_url, hex, 0);
2401
2402 /*
2403 * If a previous temp file is present, process what was already
2404 * fetched.
2405 */
2406 prevlocal = open(prevfile.buf, O_RDONLY);
2407 if (prevlocal != -1) {
2408 do {
2409 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2410 if (prev_read>0) {
2411 if (fwrite_sha1_file(prev_buf,
2412 1,
2413 prev_read,
2414 freq) == prev_read) {
2415 prev_posn += prev_read;
2416 } else {
2417 prev_read = -1;
2418 }
2419 }
2420 } while (prev_read > 0);
2421 close(prevlocal);
2422 }
2423 unlink_or_warn(prevfile.buf);
2424 strbuf_release(&prevfile);
2425
2426 /*
2427 * Reset inflate/SHA1 if there was an error reading the previous temp
2428 * file; also rewind to the beginning of the local file.
2429 */
2430 if (prev_read == -1) {
2431 memset(&freq->stream, 0, sizeof(freq->stream));
2432 git_inflate_init(&freq->stream);
2433 the_hash_algo->init_fn(&freq->c);
2434 if (prev_posn>0) {
2435 prev_posn = 0;
2436 lseek(freq->localfile, 0, SEEK_SET);
2437 if (ftruncate(freq->localfile, 0) < 0) {
2438 error_errno("Couldn't truncate temporary file %s",
2439 freq->tmpfile.buf);
2440 goto abort;
2441 }
2442 }
2443 }
2444
2445 freq->slot = get_active_slot();
2446
2447 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2448 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2449 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2450 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2451 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2452 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2453
2454 /*
2455 * If we have successfully processed data from a previous fetch
2456 * attempt, only fetch the data we don't already have.
2457 */
2458 if (prev_posn>0) {
2459 if (http_is_verbose)
2460 fprintf(stderr,
2461 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2462 hex, (uintmax_t)prev_posn);
2463 http_opt_request_remainder(freq->slot->curl, prev_posn);
2464 }
2465
2466 return freq;
2467
2468 abort:
2469 strbuf_release(&prevfile);
2470 free(freq->url);
2471 free(freq);
2472 return NULL;
2473 }
2474
2475 void process_http_object_request(struct http_object_request *freq)
2476 {
2477 if (freq->slot == NULL)
2478 return;
2479 freq->curl_result = freq->slot->curl_result;
2480 freq->http_code = freq->slot->http_code;
2481 freq->slot = NULL;
2482 }
2483
2484 int finish_http_object_request(struct http_object_request *freq)
2485 {
2486 struct stat st;
2487 struct strbuf filename = STRBUF_INIT;
2488
2489 close(freq->localfile);
2490 freq->localfile = -1;
2491
2492 process_http_object_request(freq);
2493
2494 if (freq->http_code == 416) {
2495 warning("requested range invalid; we may already have all the data.");
2496 } else if (freq->curl_result != CURLE_OK) {
2497 if (stat(freq->tmpfile.buf, &st) == 0)
2498 if (st.st_size == 0)
2499 unlink_or_warn(freq->tmpfile.buf);
2500 return -1;
2501 }
2502
2503 git_inflate_end(&freq->stream);
2504 the_hash_algo->final_fn(freq->real_oid.hash, &freq->c);
2505 if (freq->zret != Z_STREAM_END) {
2506 unlink_or_warn(freq->tmpfile.buf);
2507 return -1;
2508 }
2509 if (!oideq(&freq->oid, &freq->real_oid)) {
2510 unlink_or_warn(freq->tmpfile.buf);
2511 return -1;
2512 }
2513 loose_object_path(the_repository, &filename, &freq->oid);
2514 freq->rename = finalize_object_file(freq->tmpfile.buf, filename.buf);
2515 strbuf_release(&filename);
2516
2517 return freq->rename;
2518 }
2519
2520 void abort_http_object_request(struct http_object_request *freq)
2521 {
2522 unlink_or_warn(freq->tmpfile.buf);
2523
2524 release_http_object_request(freq);
2525 }
2526
2527 void release_http_object_request(struct http_object_request *freq)
2528 {
2529 if (freq->localfile != -1) {
2530 close(freq->localfile);
2531 freq->localfile = -1;
2532 }
2533 FREE_AND_NULL(freq->url);
2534 if (freq->slot != NULL) {
2535 freq->slot->callback_func = NULL;
2536 freq->slot->callback_data = NULL;
2537 release_active_slot(freq->slot);
2538 freq->slot = NULL;
2539 }
2540 strbuf_release(&freq->tmpfile);
2541 }
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