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