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submodule--helper: advise on fatal alternate error
[git.git] / http.c
blob027a86d75dc4d19e1e7b2361c84fd505c575a0e4
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,
517 is_rfc3986_unreserved);
518 strbuf_addch(&s, ':');
519 strbuf_addstr_urlencode(&s, proxy_auth.password,
520 is_rfc3986_unreserved);
521 curl_proxyuserpwd = strbuf_detach(&s, NULL);
522 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
523 #endif
524 }
525
526 static void init_curl_proxy_auth(CURL *result)
527 {
528 if (proxy_auth.username) {
529 if (!proxy_auth.password)
530 credential_fill(&proxy_auth);
531 set_proxyauth_name_password(result);
532 }
533
534 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
535
536 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
537 if (http_proxy_authmethod) {
538 int i;
539 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
540 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
541 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
542 proxy_authmethods[i].curlauth_param);
543 break;
544 }
545 }
546 if (i == ARRAY_SIZE(proxy_authmethods)) {
547 warning("unsupported proxy authentication method %s: using anyauth",
548 http_proxy_authmethod);
549 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
550 }
551 }
552 else
553 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
554 #endif
555 }
556
557 static int has_cert_password(void)
558 {
559 if (ssl_cert == NULL || ssl_cert_password_required != 1)
560 return 0;
561 if (!cert_auth.password) {
562 cert_auth.protocol = xstrdup("cert");
563 cert_auth.username = xstrdup("");
564 cert_auth.path = xstrdup(ssl_cert);
565 credential_fill(&cert_auth);
566 }
567 return 1;
568 }
569
570 #if LIBCURL_VERSION_NUM >= 0x071900
571 static void set_curl_keepalive(CURL *c)
572 {
573 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
574 }
575
576 #elif LIBCURL_VERSION_NUM >= 0x071000
577 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
578 {
579 int ka = 1;
580 int rc;
581 socklen_t len = (socklen_t)sizeof(ka);
582
583 if (type != CURLSOCKTYPE_IPCXN)
584 return 0;
585
586 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
587 if (rc < 0)
588 warning_errno("unable to set SO_KEEPALIVE on socket");
589
590 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
591 }
592
593 static void set_curl_keepalive(CURL *c)
594 {
595 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
596 }
597
598 #else
599 static void set_curl_keepalive(CURL *c)
600 {
601 /* not supported on older curl versions */
602 }
603 #endif
604
605 static void redact_sensitive_header(struct strbuf *header)
606 {
607 const char *sensitive_header;
608
609 if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
610 skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
611 /* The first token is the type, which is OK to log */
612 while (isspace(*sensitive_header))
613 sensitive_header++;
614 while (*sensitive_header && !isspace(*sensitive_header))
615 sensitive_header++;
616 /* Everything else is opaque and possibly sensitive */
617 strbuf_setlen(header, sensitive_header - header->buf);
618 strbuf_addstr(header, " <redacted>");
619 } else if (cookies_to_redact.nr &&
620 skip_prefix(header->buf, "Cookie:", &sensitive_header)) {
621 struct strbuf redacted_header = STRBUF_INIT;
622 char *cookie;
623
624 while (isspace(*sensitive_header))
625 sensitive_header++;
626
627 /*
628 * The contents of header starting from sensitive_header will
629 * subsequently be overridden, so it is fine to mutate this
630 * string (hence the assignment to "char *").
631 */
632 cookie = (char *) sensitive_header;
633
634 while (cookie) {
635 char *equals;
636 char *semicolon = strstr(cookie, "; ");
637 if (semicolon)
638 *semicolon = 0;
639 equals = strchrnul(cookie, '=');
640 if (!equals) {
641 /* invalid cookie, just append and continue */
642 strbuf_addstr(&redacted_header, cookie);
643 continue;
644 }
645 *equals = 0; /* temporarily set to NUL for lookup */
646 if (string_list_lookup(&cookies_to_redact, cookie)) {
647 strbuf_addstr(&redacted_header, cookie);
648 strbuf_addstr(&redacted_header, "=<redacted>");
649 } else {
650 *equals = '=';
651 strbuf_addstr(&redacted_header, cookie);
652 }
653 if (semicolon) {
654 /*
655 * There are more cookies. (Or, for some
656 * reason, the input string ends in "; ".)
657 */
658 strbuf_addstr(&redacted_header, "; ");
659 cookie = semicolon + strlen("; ");
660 } else {
661 cookie = NULL;
662 }
663 }
664
665 strbuf_setlen(header, sensitive_header - header->buf);
666 strbuf_addbuf(header, &redacted_header);
667 }
668 }
669
670 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
671 {
672 struct strbuf out = STRBUF_INIT;
673 struct strbuf **headers, **header;
674
675 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
676 text, (long)size, (long)size);
677 trace_strbuf(&trace_curl, &out);
678 strbuf_reset(&out);
679 strbuf_add(&out, ptr, size);
680 headers = strbuf_split_max(&out, '\n', 0);
681
682 for (header = headers; *header; header++) {
683 if (hide_sensitive_header)
684 redact_sensitive_header(*header);
685 strbuf_insert((*header), 0, text, strlen(text));
686 strbuf_insert((*header), strlen(text), ": ", 2);
687 strbuf_rtrim((*header));
688 strbuf_addch((*header), '\n');
689 trace_strbuf(&trace_curl, (*header));
690 }
691 strbuf_list_free(headers);
692 strbuf_release(&out);
693 }
694
695 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
696 {
697 size_t i;
698 struct strbuf out = STRBUF_INIT;
699 unsigned int width = 60;
700
701 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
702 text, (long)size, (long)size);
703 trace_strbuf(&trace_curl, &out);
704
705 for (i = 0; i < size; i += width) {
706 size_t w;
707
708 strbuf_reset(&out);
709 strbuf_addf(&out, "%s: ", text);
710 for (w = 0; (w < width) && (i + w < size); w++) {
711 unsigned char ch = ptr[i + w];
712
713 strbuf_addch(&out,
714 (ch >= 0x20) && (ch < 0x80)
715 ? ch : '.');
716 }
717 strbuf_addch(&out, '\n');
718 trace_strbuf(&trace_curl, &out);
719 }
720 strbuf_release(&out);
721 }
722
723 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
724 {
725 const char *text;
726 enum { NO_FILTER = 0, DO_FILTER = 1 };
727
728 switch (type) {
729 case CURLINFO_TEXT:
730 trace_printf_key(&trace_curl, "== Info: %s", data);
731 break;
732 case CURLINFO_HEADER_OUT:
733 text = "=> Send header";
734 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
735 break;
736 case CURLINFO_DATA_OUT:
737 if (trace_curl_data) {
738 text = "=> Send data";
739 curl_dump_data(text, (unsigned char *)data, size);
740 }
741 break;
742 case CURLINFO_SSL_DATA_OUT:
743 if (trace_curl_data) {
744 text = "=> Send SSL data";
745 curl_dump_data(text, (unsigned char *)data, size);
746 }
747 break;
748 case CURLINFO_HEADER_IN:
749 text = "<= Recv header";
750 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
751 break;
752 case CURLINFO_DATA_IN:
753 if (trace_curl_data) {
754 text = "<= Recv data";
755 curl_dump_data(text, (unsigned char *)data, size);
756 }
757 break;
758 case CURLINFO_SSL_DATA_IN:
759 if (trace_curl_data) {
760 text = "<= Recv SSL data";
761 curl_dump_data(text, (unsigned char *)data, size);
762 }
763 break;
764
765 default: /* we ignore unknown types by default */
766 return 0;
767 }
768 return 0;
769 }
770
771 void setup_curl_trace(CURL *handle)
772 {
773 if (!trace_want(&trace_curl))
774 return;
775 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
776 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
777 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
778 }
779
780 #ifdef CURLPROTO_HTTP
781 static long get_curl_allowed_protocols(int from_user)
782 {
783 long allowed_protocols = 0;
784
785 if (is_transport_allowed("http", from_user))
786 allowed_protocols |= CURLPROTO_HTTP;
787 if (is_transport_allowed("https", from_user))
788 allowed_protocols |= CURLPROTO_HTTPS;
789 if (is_transport_allowed("ftp", from_user))
790 allowed_protocols |= CURLPROTO_FTP;
791 if (is_transport_allowed("ftps", from_user))
792 allowed_protocols |= CURLPROTO_FTPS;
793
794 return allowed_protocols;
795 }
796 #endif
797
798 #if LIBCURL_VERSION_NUM >=0x072f00
799 static int get_curl_http_version_opt(const char *version_string, long *opt)
800 {
801 int i;
802 static struct {
803 const char *name;
804 long opt_token;
805 } choice[] = {
806 { "HTTP/1.1", CURL_HTTP_VERSION_1_1 },
807 { "HTTP/2", CURL_HTTP_VERSION_2 }
808 };
809
810 for (i = 0; i < ARRAY_SIZE(choice); i++) {
811 if (!strcmp(version_string, choice[i].name)) {
812 *opt = choice[i].opt_token;
813 return 0;
814 }
815 }
816
817 warning("unknown value given to http.version: '%s'", version_string);
818 return -1; /* not found */
819 }
820
821 #endif
822
823 static CURL *get_curl_handle(void)
824 {
825 CURL *result = curl_easy_init();
826
827 if (!result)
828 die("curl_easy_init failed");
829
830 if (!curl_ssl_verify) {
831 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
832 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
833 } else {
834 /* Verify authenticity of the peer's certificate */
835 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
836 /* The name in the cert must match whom we tried to connect */
837 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
838 }
839
840 #if LIBCURL_VERSION_NUM >= 0x072f00 // 7.47.0
841 if (curl_http_version) {
842 long opt;
843 if (!get_curl_http_version_opt(curl_http_version, &opt)) {
844 /* Set request use http version */
845 curl_easy_setopt(result, CURLOPT_HTTP_VERSION, opt);
846 }
847 }
848 #endif
849
850 #if LIBCURL_VERSION_NUM >= 0x070907
851 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
852 #endif
853 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
854 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
855 #endif
856
857 #ifdef CURLGSSAPI_DELEGATION_FLAG
858 if (curl_deleg) {
859 int i;
860 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
861 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
862 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
863 curl_deleg_levels[i].curl_deleg_param);
864 break;
865 }
866 }
867 if (i == ARRAY_SIZE(curl_deleg_levels))
868 warning("Unknown delegation method '%s': using default",
869 curl_deleg);
870 }
871 #endif
872
873 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
874 !http_schannel_check_revoke) {
875 #if LIBCURL_VERSION_NUM >= 0x072c00
876 curl_easy_setopt(result, CURLOPT_SSL_OPTIONS, CURLSSLOPT_NO_REVOKE);
877 #else
878 warning(_("CURLSSLOPT_NO_REVOKE not supported with cURL < 7.44.0"));
879 #endif
880 }
881
882 if (http_proactive_auth)
883 init_curl_http_auth(result);
884
885 if (getenv("GIT_SSL_VERSION"))
886 ssl_version = getenv("GIT_SSL_VERSION");
887 if (ssl_version && *ssl_version) {
888 int i;
889 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
890 if (!strcmp(ssl_version, sslversions[i].name)) {
891 curl_easy_setopt(result, CURLOPT_SSLVERSION,
892 sslversions[i].ssl_version);
893 break;
894 }
895 }
896 if (i == ARRAY_SIZE(sslversions))
897 warning("unsupported ssl version %s: using default",
898 ssl_version);
899 }
900
901 if (getenv("GIT_SSL_CIPHER_LIST"))
902 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
903 if (ssl_cipherlist != NULL && *ssl_cipherlist)
904 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
905 ssl_cipherlist);
906
907 if (ssl_cert != NULL)
908 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
909 if (has_cert_password())
910 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
911 #if LIBCURL_VERSION_NUM >= 0x070903
912 if (ssl_key != NULL)
913 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
914 #endif
915 #if LIBCURL_VERSION_NUM >= 0x070908
916 if (ssl_capath != NULL)
917 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
918 #endif
919 #if LIBCURL_VERSION_NUM >= 0x072c00
920 if (ssl_pinnedkey != NULL)
921 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
922 #endif
923 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
924 !http_schannel_use_ssl_cainfo) {
925 curl_easy_setopt(result, CURLOPT_CAINFO, NULL);
926 #if LIBCURL_VERSION_NUM >= 0x073400
927 curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, NULL);
928 #endif
929 } else if (ssl_cainfo != NULL)
930 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
931
932 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
933 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
934 curl_low_speed_limit);
935 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
936 curl_low_speed_time);
937 }
938
939 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
940 #if LIBCURL_VERSION_NUM >= 0x071301
941 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
942 #elif LIBCURL_VERSION_NUM >= 0x071101
943 curl_easy_setopt(result, CURLOPT_POST301, 1);
944 #endif
945 #ifdef CURLPROTO_HTTP
946 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
947 get_curl_allowed_protocols(0));
948 curl_easy_setopt(result, CURLOPT_PROTOCOLS,
949 get_curl_allowed_protocols(-1));
950 #else
951 warning(_("Protocol restrictions not supported with cURL < 7.19.4"));
952 #endif
953 if (getenv("GIT_CURL_VERBOSE"))
954 curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
955 setup_curl_trace(result);
956 if (getenv("GIT_TRACE_CURL_NO_DATA"))
957 trace_curl_data = 0;
958 if (getenv("GIT_REDACT_COOKIES")) {
959 string_list_split(&cookies_to_redact,
960 getenv("GIT_REDACT_COOKIES"), ',', -1);
961 string_list_sort(&cookies_to_redact);
962 }
963
964 curl_easy_setopt(result, CURLOPT_USERAGENT,
965 user_agent ? user_agent : git_user_agent());
966
967 if (curl_ftp_no_epsv)
968 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
969
970 #ifdef CURLOPT_USE_SSL
971 if (curl_ssl_try)
972 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
973 #endif
974
975 /*
976 * CURL also examines these variables as a fallback; but we need to query
977 * them here in order to decide whether to prompt for missing password (cf.
978 * init_curl_proxy_auth()).
979 *
980 * Unlike many other common environment variables, these are historically
981 * lowercase only. It appears that CURL did not know this and implemented
982 * only uppercase variants, which was later corrected to take both - with
983 * the exception of http_proxy, which is lowercase only also in CURL. As
984 * the lowercase versions are the historical quasi-standard, they take
985 * precedence here, as in CURL.
986 */
987 if (!curl_http_proxy) {
988 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
989 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
990 var_override(&curl_http_proxy, getenv("https_proxy"));
991 } else {
992 var_override(&curl_http_proxy, getenv("http_proxy"));
993 }
994 if (!curl_http_proxy) {
995 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
996 var_override(&curl_http_proxy, getenv("all_proxy"));
997 }
998 }
999
1000 if (curl_http_proxy && curl_http_proxy[0] == '\0') {
1001 /*
1002 * Handle case with the empty http.proxy value here to keep
1003 * common code clean.
1004 * NB: empty option disables proxying at all.
1005 */
1006 curl_easy_setopt(result, CURLOPT_PROXY, "");
1007 } else if (curl_http_proxy) {
1008 #if LIBCURL_VERSION_NUM >= 0x071800
1009 if (starts_with(curl_http_proxy, "socks5h"))
1010 curl_easy_setopt(result,
1011 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
1012 else if (starts_with(curl_http_proxy, "socks5"))
1013 curl_easy_setopt(result,
1014 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
1015 else if (starts_with(curl_http_proxy, "socks4a"))
1016 curl_easy_setopt(result,
1017 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
1018 else if (starts_with(curl_http_proxy, "socks"))
1019 curl_easy_setopt(result,
1020 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
1021 #endif
1022 #if LIBCURL_VERSION_NUM >= 0x073400
1023 else if (starts_with(curl_http_proxy, "https"))
1024 curl_easy_setopt(result,
1025 CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
1026 #endif
1027 if (strstr(curl_http_proxy, "://"))
1028 credential_from_url(&proxy_auth, curl_http_proxy);
1029 else {
1030 struct strbuf url = STRBUF_INIT;
1031 strbuf_addf(&url, "http://%s", curl_http_proxy);
1032 credential_from_url(&proxy_auth, url.buf);
1033 strbuf_release(&url);
1034 }
1035
1036 if (!proxy_auth.host)
1037 die("Invalid proxy URL '%s'", curl_http_proxy);
1038
1039 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
1040 #if LIBCURL_VERSION_NUM >= 0x071304
1041 var_override(&curl_no_proxy, getenv("NO_PROXY"));
1042 var_override(&curl_no_proxy, getenv("no_proxy"));
1043 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
1044 #endif
1045 }
1046 init_curl_proxy_auth(result);
1047
1048 set_curl_keepalive(result);
1049
1050 return result;
1051 }
1052
1053 static void set_from_env(const char **var, const char *envname)
1054 {
1055 const char *val = getenv(envname);
1056 if (val)
1057 *var = val;
1058 }
1059
1060 void http_init(struct remote *remote, const char *url, int proactive_auth)
1061 {
1062 char *low_speed_limit;
1063 char *low_speed_time;
1064 char *normalized_url;
1065 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
1066
1067 config.section = "http";
1068 config.key = NULL;
1069 config.collect_fn = http_options;
1070 config.cascade_fn = git_default_config;
1071 config.cb = NULL;
1072
1073 http_is_verbose = 0;
1074 normalized_url = url_normalize(url, &config.url);
1075
1076 git_config(urlmatch_config_entry, &config);
1077 free(normalized_url);
1078 string_list_clear(&config.vars, 1);
1079
1080 #if LIBCURL_VERSION_NUM >= 0x073800
1081 if (http_ssl_backend) {
1082 const curl_ssl_backend **backends;
1083 struct strbuf buf = STRBUF_INIT;
1084 int i;
1085
1086 switch (curl_global_sslset(-1, http_ssl_backend, &backends)) {
1087 case CURLSSLSET_UNKNOWN_BACKEND:
1088 strbuf_addf(&buf, _("Unsupported SSL backend '%s'. "
1089 "Supported SSL backends:"),
1090 http_ssl_backend);
1091 for (i = 0; backends[i]; i++)
1092 strbuf_addf(&buf, "\n\t%s", backends[i]->name);
1093 die("%s", buf.buf);
1094 case CURLSSLSET_NO_BACKENDS:
1095 die(_("Could not set SSL backend to '%s': "
1096 "cURL was built without SSL backends"),
1097 http_ssl_backend);
1098 case CURLSSLSET_TOO_LATE:
1099 die(_("Could not set SSL backend to '%s': already set"),
1100 http_ssl_backend);
1101 case CURLSSLSET_OK:
1102 break; /* Okay! */
1103 }
1104 }
1105 #endif
1106
1107 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1108 die("curl_global_init failed");
1109
1110 http_proactive_auth = proactive_auth;
1111
1112 if (remote && remote->http_proxy)
1113 curl_http_proxy = xstrdup(remote->http_proxy);
1114
1115 if (remote)
1116 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
1117
1118 pragma_header = curl_slist_append(http_copy_default_headers(),
1119 "Pragma: no-cache");
1120 no_pragma_header = curl_slist_append(http_copy_default_headers(),
1121 "Pragma:");
1122
1123 #ifdef USE_CURL_MULTI
1124 {
1125 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1126 if (http_max_requests != NULL)
1127 max_requests = atoi(http_max_requests);
1128 }
1129
1130 curlm = curl_multi_init();
1131 if (!curlm)
1132 die("curl_multi_init failed");
1133 #endif
1134
1135 if (getenv("GIT_SSL_NO_VERIFY"))
1136 curl_ssl_verify = 0;
1137
1138 set_from_env(&ssl_cert, "GIT_SSL_CERT");
1139 #if LIBCURL_VERSION_NUM >= 0x070903
1140 set_from_env(&ssl_key, "GIT_SSL_KEY");
1141 #endif
1142 #if LIBCURL_VERSION_NUM >= 0x070908
1143 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
1144 #endif
1145 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
1146
1147 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
1148
1149 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1150 if (low_speed_limit != NULL)
1151 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1152 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1153 if (low_speed_time != NULL)
1154 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1155
1156 if (curl_ssl_verify == -1)
1157 curl_ssl_verify = 1;
1158
1159 curl_session_count = 0;
1160 #ifdef USE_CURL_MULTI
1161 if (max_requests < 1)
1162 max_requests = DEFAULT_MAX_REQUESTS;
1163 #endif
1164
1165 if (getenv("GIT_CURL_FTP_NO_EPSV"))
1166 curl_ftp_no_epsv = 1;
1167
1168 if (url) {
1169 credential_from_url(&http_auth, url);
1170 if (!ssl_cert_password_required &&
1171 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1172 starts_with(url, "https://"))
1173 ssl_cert_password_required = 1;
1174 }
1175
1176 #ifndef NO_CURL_EASY_DUPHANDLE
1177 curl_default = get_curl_handle();
1178 #endif
1179 }
1180
1181 void http_cleanup(void)
1182 {
1183 struct active_request_slot *slot = active_queue_head;
1184
1185 while (slot != NULL) {
1186 struct active_request_slot *next = slot->next;
1187 if (slot->curl != NULL) {
1188 xmulti_remove_handle(slot);
1189 curl_easy_cleanup(slot->curl);
1190 }
1191 free(slot);
1192 slot = next;
1193 }
1194 active_queue_head = NULL;
1195
1196 #ifndef NO_CURL_EASY_DUPHANDLE
1197 curl_easy_cleanup(curl_default);
1198 #endif
1199
1200 #ifdef USE_CURL_MULTI
1201 curl_multi_cleanup(curlm);
1202 #endif
1203 curl_global_cleanup();
1204
1205 curl_slist_free_all(extra_http_headers);
1206 extra_http_headers = NULL;
1207
1208 curl_slist_free_all(pragma_header);
1209 pragma_header = NULL;
1210
1211 curl_slist_free_all(no_pragma_header);
1212 no_pragma_header = NULL;
1213
1214 if (curl_http_proxy) {
1215 free((void *)curl_http_proxy);
1216 curl_http_proxy = NULL;
1217 }
1218
1219 if (proxy_auth.password) {
1220 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1221 FREE_AND_NULL(proxy_auth.password);
1222 }
1223
1224 free((void *)curl_proxyuserpwd);
1225 curl_proxyuserpwd = NULL;
1226
1227 free((void *)http_proxy_authmethod);
1228 http_proxy_authmethod = NULL;
1229
1230 if (cert_auth.password != NULL) {
1231 memset(cert_auth.password, 0, strlen(cert_auth.password));
1232 FREE_AND_NULL(cert_auth.password);
1233 }
1234 ssl_cert_password_required = 0;
1235
1236 FREE_AND_NULL(cached_accept_language);
1237 }
1238
1239 struct active_request_slot *get_active_slot(void)
1240 {
1241 struct active_request_slot *slot = active_queue_head;
1242 struct active_request_slot *newslot;
1243
1244 #ifdef USE_CURL_MULTI
1245 int num_transfers;
1246
1247 /* Wait for a slot to open up if the queue is full */
1248 while (active_requests >= max_requests) {
1249 curl_multi_perform(curlm, &num_transfers);
1250 if (num_transfers < active_requests)
1251 process_curl_messages();
1252 }
1253 #endif
1254
1255 while (slot != NULL && slot->in_use)
1256 slot = slot->next;
1257
1258 if (slot == NULL) {
1259 newslot = xmalloc(sizeof(*newslot));
1260 newslot->curl = NULL;
1261 newslot->in_use = 0;
1262 newslot->next = NULL;
1263
1264 slot = active_queue_head;
1265 if (slot == NULL) {
1266 active_queue_head = newslot;
1267 } else {
1268 while (slot->next != NULL)
1269 slot = slot->next;
1270 slot->next = newslot;
1271 }
1272 slot = newslot;
1273 }
1274
1275 if (slot->curl == NULL) {
1276 #ifdef NO_CURL_EASY_DUPHANDLE
1277 slot->curl = get_curl_handle();
1278 #else
1279 slot->curl = curl_easy_duphandle(curl_default);
1280 #endif
1281 curl_session_count++;
1282 }
1283
1284 active_requests++;
1285 slot->in_use = 1;
1286 slot->results = NULL;
1287 slot->finished = NULL;
1288 slot->callback_data = NULL;
1289 slot->callback_func = NULL;
1290 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1291 if (curl_save_cookies)
1292 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1293 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1294 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1295 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1296 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1297 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1298 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1299 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1300 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1301 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1302 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1303
1304 /*
1305 * Default following to off unless "ALWAYS" is configured; this gives
1306 * callers a sane starting point, and they can tweak for individual
1307 * HTTP_FOLLOW_* cases themselves.
1308 */
1309 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1310 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1311 else
1312 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1313
1314 #if LIBCURL_VERSION_NUM >= 0x070a08
1315 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1316 #endif
1317 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1318 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1319 #endif
1320 if (http_auth.password || curl_empty_auth_enabled())
1321 init_curl_http_auth(slot->curl);
1322
1323 return slot;
1324 }
1325
1326 int start_active_slot(struct active_request_slot *slot)
1327 {
1328 #ifdef USE_CURL_MULTI
1329 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1330 int num_transfers;
1331
1332 if (curlm_result != CURLM_OK &&
1333 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1334 warning("curl_multi_add_handle failed: %s",
1335 curl_multi_strerror(curlm_result));
1336 active_requests--;
1337 slot->in_use = 0;
1338 return 0;
1339 }
1340
1341 /*
1342 * We know there must be something to do, since we just added
1343 * something.
1344 */
1345 curl_multi_perform(curlm, &num_transfers);
1346 #endif
1347 return 1;
1348 }
1349
1350 #ifdef USE_CURL_MULTI
1351 struct fill_chain {
1352 void *data;
1353 int (*fill)(void *);
1354 struct fill_chain *next;
1355 };
1356
1357 static struct fill_chain *fill_cfg;
1358
1359 void add_fill_function(void *data, int (*fill)(void *))
1360 {
1361 struct fill_chain *new_fill = xmalloc(sizeof(*new_fill));
1362 struct fill_chain **linkp = &fill_cfg;
1363 new_fill->data = data;
1364 new_fill->fill = fill;
1365 new_fill->next = NULL;
1366 while (*linkp)
1367 linkp = &(*linkp)->next;
1368 *linkp = new_fill;
1369 }
1370
1371 void fill_active_slots(void)
1372 {
1373 struct active_request_slot *slot = active_queue_head;
1374
1375 while (active_requests < max_requests) {
1376 struct fill_chain *fill;
1377 for (fill = fill_cfg; fill; fill = fill->next)
1378 if (fill->fill(fill->data))
1379 break;
1380
1381 if (!fill)
1382 break;
1383 }
1384
1385 while (slot != NULL) {
1386 if (!slot->in_use && slot->curl != NULL
1387 && curl_session_count > min_curl_sessions) {
1388 curl_easy_cleanup(slot->curl);
1389 slot->curl = NULL;
1390 curl_session_count--;
1391 }
1392 slot = slot->next;
1393 }
1394 }
1395
1396 void step_active_slots(void)
1397 {
1398 int num_transfers;
1399 CURLMcode curlm_result;
1400
1401 do {
1402 curlm_result = curl_multi_perform(curlm, &num_transfers);
1403 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1404 if (num_transfers < active_requests) {
1405 process_curl_messages();
1406 fill_active_slots();
1407 }
1408 }
1409 #endif
1410
1411 void run_active_slot(struct active_request_slot *slot)
1412 {
1413 #ifdef USE_CURL_MULTI
1414 fd_set readfds;
1415 fd_set writefds;
1416 fd_set excfds;
1417 int max_fd;
1418 struct timeval select_timeout;
1419 int finished = 0;
1420
1421 slot->finished = &finished;
1422 while (!finished) {
1423 step_active_slots();
1424
1425 if (slot->in_use) {
1426 #if LIBCURL_VERSION_NUM >= 0x070f04
1427 long curl_timeout;
1428 curl_multi_timeout(curlm, &curl_timeout);
1429 if (curl_timeout == 0) {
1430 continue;
1431 } else if (curl_timeout == -1) {
1432 select_timeout.tv_sec = 0;
1433 select_timeout.tv_usec = 50000;
1434 } else {
1435 select_timeout.tv_sec = curl_timeout / 1000;
1436 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1437 }
1438 #else
1439 select_timeout.tv_sec = 0;
1440 select_timeout.tv_usec = 50000;
1441 #endif
1442
1443 max_fd = -1;
1444 FD_ZERO(&readfds);
1445 FD_ZERO(&writefds);
1446 FD_ZERO(&excfds);
1447 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1448
1449 /*
1450 * It can happen that curl_multi_timeout returns a pathologically
1451 * long timeout when curl_multi_fdset returns no file descriptors
1452 * to read. See commit message for more details.
1453 */
1454 if (max_fd < 0 &&
1455 (select_timeout.tv_sec > 0 ||
1456 select_timeout.tv_usec > 50000)) {
1457 select_timeout.tv_sec = 0;
1458 select_timeout.tv_usec = 50000;
1459 }
1460
1461 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1462 }
1463 }
1464 #else
1465 while (slot->in_use) {
1466 slot->curl_result = curl_easy_perform(slot->curl);
1467 finish_active_slot(slot);
1468 }
1469 #endif
1470 }
1471
1472 static void release_active_slot(struct active_request_slot *slot)
1473 {
1474 closedown_active_slot(slot);
1475 if (slot->curl) {
1476 xmulti_remove_handle(slot);
1477 if (curl_session_count > min_curl_sessions) {
1478 curl_easy_cleanup(slot->curl);
1479 slot->curl = NULL;
1480 curl_session_count--;
1481 }
1482 }
1483 #ifdef USE_CURL_MULTI
1484 fill_active_slots();
1485 #endif
1486 }
1487
1488 void finish_all_active_slots(void)
1489 {
1490 struct active_request_slot *slot = active_queue_head;
1491
1492 while (slot != NULL)
1493 if (slot->in_use) {
1494 run_active_slot(slot);
1495 slot = active_queue_head;
1496 } else {
1497 slot = slot->next;
1498 }
1499 }
1500
1501 /* Helpers for modifying and creating URLs */
1502 static inline int needs_quote(int ch)
1503 {
1504 if (((ch >= 'A') && (ch <= 'Z'))
1505 || ((ch >= 'a') && (ch <= 'z'))
1506 || ((ch >= '0') && (ch <= '9'))
1507 || (ch == '/')
1508 || (ch == '-')
1509 || (ch == '.'))
1510 return 0;
1511 return 1;
1512 }
1513
1514 static char *quote_ref_url(const char *base, const char *ref)
1515 {
1516 struct strbuf buf = STRBUF_INIT;
1517 const char *cp;
1518 int ch;
1519
1520 end_url_with_slash(&buf, base);
1521
1522 for (cp = ref; (ch = *cp) != 0; cp++)
1523 if (needs_quote(ch))
1524 strbuf_addf(&buf, "%%%02x", ch);
1525 else
1526 strbuf_addch(&buf, *cp);
1527
1528 return strbuf_detach(&buf, NULL);
1529 }
1530
1531 void append_remote_object_url(struct strbuf *buf, const char *url,
1532 const char *hex,
1533 int only_two_digit_prefix)
1534 {
1535 end_url_with_slash(buf, url);
1536
1537 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1538 if (!only_two_digit_prefix)
1539 strbuf_addstr(buf, hex + 2);
1540 }
1541
1542 char *get_remote_object_url(const char *url, const char *hex,
1543 int only_two_digit_prefix)
1544 {
1545 struct strbuf buf = STRBUF_INIT;
1546 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1547 return strbuf_detach(&buf, NULL);
1548 }
1549
1550 void normalize_curl_result(CURLcode *result, long http_code,
1551 char *errorstr, size_t errorlen)
1552 {
1553 /*
1554 * If we see a failing http code with CURLE_OK, we have turned off
1555 * FAILONERROR (to keep the server's custom error response), and should
1556 * translate the code into failure here.
1557 *
1558 * Likewise, if we see a redirect (30x code), that means we turned off
1559 * redirect-following, and we should treat the result as an error.
1560 */
1561 if (*result == CURLE_OK && http_code >= 300) {
1562 *result = CURLE_HTTP_RETURNED_ERROR;
1563 /*
1564 * Normally curl will already have put the "reason phrase"
1565 * from the server into curl_errorstr; unfortunately without
1566 * FAILONERROR it is lost, so we can give only the numeric
1567 * status code.
1568 */
1569 xsnprintf(errorstr, errorlen,
1570 "The requested URL returned error: %ld",
1571 http_code);
1572 }
1573 }
1574
1575 static int handle_curl_result(struct slot_results *results)
1576 {
1577 normalize_curl_result(&results->curl_result, results->http_code,
1578 curl_errorstr, sizeof(curl_errorstr));
1579
1580 if (results->curl_result == CURLE_OK) {
1581 credential_approve(&http_auth);
1582 if (proxy_auth.password)
1583 credential_approve(&proxy_auth);
1584 return HTTP_OK;
1585 } else if (missing_target(results))
1586 return HTTP_MISSING_TARGET;
1587 else if (results->http_code == 401) {
1588 if (http_auth.username && http_auth.password) {
1589 credential_reject(&http_auth);
1590 return HTTP_NOAUTH;
1591 } else {
1592 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1593 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1594 if (results->auth_avail) {
1595 http_auth_methods &= results->auth_avail;
1596 http_auth_methods_restricted = 1;
1597 }
1598 #endif
1599 return HTTP_REAUTH;
1600 }
1601 } else {
1602 if (results->http_connectcode == 407)
1603 credential_reject(&proxy_auth);
1604 #if LIBCURL_VERSION_NUM >= 0x070c00
1605 if (!curl_errorstr[0])
1606 strlcpy(curl_errorstr,
1607 curl_easy_strerror(results->curl_result),
1608 sizeof(curl_errorstr));
1609 #endif
1610 return HTTP_ERROR;
1611 }
1612 }
1613
1614 int run_one_slot(struct active_request_slot *slot,
1615 struct slot_results *results)
1616 {
1617 slot->results = results;
1618 if (!start_active_slot(slot)) {
1619 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1620 "failed to start HTTP request");
1621 return HTTP_START_FAILED;
1622 }
1623
1624 run_active_slot(slot);
1625 return handle_curl_result(results);
1626 }
1627
1628 struct curl_slist *http_copy_default_headers(void)
1629 {
1630 struct curl_slist *headers = NULL, *h;
1631
1632 for (h = extra_http_headers; h; h = h->next)
1633 headers = curl_slist_append(headers, h->data);
1634
1635 return headers;
1636 }
1637
1638 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1639 {
1640 char *ptr;
1641 CURLcode ret;
1642
1643 strbuf_reset(buf);
1644 ret = curl_easy_getinfo(curl, info, &ptr);
1645 if (!ret && ptr)
1646 strbuf_addstr(buf, ptr);
1647 return ret;
1648 }
1649
1650 /*
1651 * Check for and extract a content-type parameter. "raw"
1652 * should be positioned at the start of the potential
1653 * parameter, with any whitespace already removed.
1654 *
1655 * "name" is the name of the parameter. The value is appended
1656 * to "out".
1657 */
1658 static int extract_param(const char *raw, const char *name,
1659 struct strbuf *out)
1660 {
1661 size_t len = strlen(name);
1662
1663 if (strncasecmp(raw, name, len))
1664 return -1;
1665 raw += len;
1666
1667 if (*raw != '=')
1668 return -1;
1669 raw++;
1670
1671 while (*raw && !isspace(*raw) && *raw != ';')
1672 strbuf_addch(out, *raw++);
1673 return 0;
1674 }
1675
1676 /*
1677 * Extract a normalized version of the content type, with any
1678 * spaces suppressed, all letters lowercased, and no trailing ";"
1679 * or parameters.
1680 *
1681 * Note that we will silently remove even invalid whitespace. For
1682 * example, "text / plain" is specifically forbidden by RFC 2616,
1683 * but "text/plain" is the only reasonable output, and this keeps
1684 * our code simple.
1685 *
1686 * If the "charset" argument is not NULL, store the value of any
1687 * charset parameter there.
1688 *
1689 * Example:
1690 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1691 * "text / plain" -> "text/plain"
1692 */
1693 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1694 struct strbuf *charset)
1695 {
1696 const char *p;
1697
1698 strbuf_reset(type);
1699 strbuf_grow(type, raw->len);
1700 for (p = raw->buf; *p; p++) {
1701 if (isspace(*p))
1702 continue;
1703 if (*p == ';') {
1704 p++;
1705 break;
1706 }
1707 strbuf_addch(type, tolower(*p));
1708 }
1709
1710 if (!charset)
1711 return;
1712
1713 strbuf_reset(charset);
1714 while (*p) {
1715 while (isspace(*p) || *p == ';')
1716 p++;
1717 if (!extract_param(p, "charset", charset))
1718 return;
1719 while (*p && !isspace(*p))
1720 p++;
1721 }
1722
1723 if (!charset->len && starts_with(type->buf, "text/"))
1724 strbuf_addstr(charset, "ISO-8859-1");
1725 }
1726
1727 static void write_accept_language(struct strbuf *buf)
1728 {
1729 /*
1730 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1731 * that, q-value will be smaller than 0.001, the minimum q-value the
1732 * HTTP specification allows. See
1733 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1734 */
1735 const int MAX_DECIMAL_PLACES = 3;
1736 const int MAX_LANGUAGE_TAGS = 1000;
1737 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1738 char **language_tags = NULL;
1739 int num_langs = 0;
1740 const char *s = get_preferred_languages();
1741 int i;
1742 struct strbuf tag = STRBUF_INIT;
1743
1744 /* Don't add Accept-Language header if no language is preferred. */
1745 if (!s)
1746 return;
1747
1748 /*
1749 * Split the colon-separated string of preferred languages into
1750 * language_tags array.
1751 */
1752 do {
1753 /* collect language tag */
1754 for (; *s && (isalnum(*s) || *s == '_'); s++)
1755 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1756
1757 /* skip .codeset, @modifier and any other unnecessary parts */
1758 while (*s && *s != ':')
1759 s++;
1760
1761 if (tag.len) {
1762 num_langs++;
1763 REALLOC_ARRAY(language_tags, num_langs);
1764 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1765 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1766 break;
1767 }
1768 } while (*s++);
1769
1770 /* write Accept-Language header into buf */
1771 if (num_langs) {
1772 int last_buf_len = 0;
1773 int max_q;
1774 int decimal_places;
1775 char q_format[32];
1776
1777 /* add '*' */
1778 REALLOC_ARRAY(language_tags, num_langs + 1);
1779 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1780
1781 /* compute decimal_places */
1782 for (max_q = 1, decimal_places = 0;
1783 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1784 decimal_places++, max_q *= 10)
1785 ;
1786
1787 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1788
1789 strbuf_addstr(buf, "Accept-Language: ");
1790
1791 for (i = 0; i < num_langs; i++) {
1792 if (i > 0)
1793 strbuf_addstr(buf, ", ");
1794
1795 strbuf_addstr(buf, language_tags[i]);
1796
1797 if (i > 0)
1798 strbuf_addf(buf, q_format, max_q - i);
1799
1800 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1801 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1802 break;
1803 }
1804
1805 last_buf_len = buf->len;
1806 }
1807 }
1808
1809 /* free language tags -- last one is a static '*' */
1810 for (i = 0; i < num_langs - 1; i++)
1811 free(language_tags[i]);
1812 free(language_tags);
1813 }
1814
1815 /*
1816 * Get an Accept-Language header which indicates user's preferred languages.
1817 *
1818 * Examples:
1819 * LANGUAGE= -> ""
1820 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1821 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1822 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1823 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1824 * LANGUAGE= LANG=C -> ""
1825 */
1826 static const char *get_accept_language(void)
1827 {
1828 if (!cached_accept_language) {
1829 struct strbuf buf = STRBUF_INIT;
1830 write_accept_language(&buf);
1831 if (buf.len > 0)
1832 cached_accept_language = strbuf_detach(&buf, NULL);
1833 }
1834
1835 return cached_accept_language;
1836 }
1837
1838 static void http_opt_request_remainder(CURL *curl, off_t pos)
1839 {
1840 char buf[128];
1841 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1842 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1843 }
1844
1845 /* http_request() targets */
1846 #define HTTP_REQUEST_STRBUF 0
1847 #define HTTP_REQUEST_FILE 1
1848
1849 static int http_request(const char *url,
1850 void *result, int target,
1851 const struct http_get_options *options)
1852 {
1853 struct active_request_slot *slot;
1854 struct slot_results results;
1855 struct curl_slist *headers = http_copy_default_headers();
1856 struct strbuf buf = STRBUF_INIT;
1857 const char *accept_language;
1858 int ret;
1859
1860 slot = get_active_slot();
1861 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1862
1863 if (result == NULL) {
1864 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1865 } else {
1866 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1867 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1868
1869 if (target == HTTP_REQUEST_FILE) {
1870 off_t posn = ftello(result);
1871 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1872 fwrite);
1873 if (posn > 0)
1874 http_opt_request_remainder(slot->curl, posn);
1875 } else
1876 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1877 fwrite_buffer);
1878 }
1879
1880 accept_language = get_accept_language();
1881
1882 if (accept_language)
1883 headers = curl_slist_append(headers, accept_language);
1884
1885 strbuf_addstr(&buf, "Pragma:");
1886 if (options && options->no_cache)
1887 strbuf_addstr(&buf, " no-cache");
1888 if (options && options->initial_request &&
1889 http_follow_config == HTTP_FOLLOW_INITIAL)
1890 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1891
1892 headers = curl_slist_append(headers, buf.buf);
1893
1894 /* Add additional headers here */
1895 if (options && options->extra_headers) {
1896 const struct string_list_item *item;
1897 for_each_string_list_item(item, options->extra_headers) {
1898 headers = curl_slist_append(headers, item->string);
1899 }
1900 }
1901
1902 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1903 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1904 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1905 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1906
1907 ret = run_one_slot(slot, &results);
1908
1909 if (options && options->content_type) {
1910 struct strbuf raw = STRBUF_INIT;
1911 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1912 extract_content_type(&raw, options->content_type,
1913 options->charset);
1914 strbuf_release(&raw);
1915 }
1916
1917 if (options && options->effective_url)
1918 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1919 options->effective_url);
1920
1921 curl_slist_free_all(headers);
1922 strbuf_release(&buf);
1923
1924 return ret;
1925 }
1926
1927 /*
1928 * Update the "base" url to a more appropriate value, as deduced by
1929 * redirects seen when requesting a URL starting with "url".
1930 *
1931 * The "asked" parameter is a URL that we asked curl to access, and must begin
1932 * with "base".
1933 *
1934 * The "got" parameter is the URL that curl reported to us as where we ended
1935 * up.
1936 *
1937 * Returns 1 if we updated the base url, 0 otherwise.
1938 *
1939 * Our basic strategy is to compare "base" and "asked" to find the bits
1940 * specific to our request. We then strip those bits off of "got" to yield the
1941 * new base. So for example, if our base is "http://example.com/foo.git",
1942 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1943 * with "https://other.example.com/foo.git/info/refs". We would want the
1944 * new URL to become "https://other.example.com/foo.git".
1945 *
1946 * Note that this assumes a sane redirect scheme. It's entirely possible
1947 * in the example above to end up at a URL that does not even end in
1948 * "info/refs". In such a case we die. There's not much we can do, such a
1949 * scheme is unlikely to represent a real git repository, and failing to
1950 * rewrite the base opens options for malicious redirects to do funny things.
1951 */
1952 static int update_url_from_redirect(struct strbuf *base,
1953 const char *asked,
1954 const struct strbuf *got)
1955 {
1956 const char *tail;
1957 size_t new_len;
1958
1959 if (!strcmp(asked, got->buf))
1960 return 0;
1961
1962 if (!skip_prefix(asked, base->buf, &tail))
1963 BUG("update_url_from_redirect: %s is not a superset of %s",
1964 asked, base->buf);
1965
1966 new_len = got->len;
1967 if (!strip_suffix_mem(got->buf, &new_len, tail))
1968 die(_("unable to update url base from redirection:\n"
1969 " asked for: %s\n"
1970 " redirect: %s"),
1971 asked, got->buf);
1972
1973 strbuf_reset(base);
1974 strbuf_add(base, got->buf, new_len);
1975
1976 return 1;
1977 }
1978
1979 static int http_request_reauth(const char *url,
1980 void *result, int target,
1981 struct http_get_options *options)
1982 {
1983 int ret = http_request(url, result, target, options);
1984
1985 if (ret != HTTP_OK && ret != HTTP_REAUTH)
1986 return ret;
1987
1988 if (options && options->effective_url && options->base_url) {
1989 if (update_url_from_redirect(options->base_url,
1990 url, options->effective_url)) {
1991 credential_from_url(&http_auth, options->base_url->buf);
1992 url = options->effective_url->buf;
1993 }
1994 }
1995
1996 if (ret != HTTP_REAUTH)
1997 return ret;
1998
1999 /*
2000 * The previous request may have put cruft into our output stream; we
2001 * should clear it out before making our next request.
2002 */
2003 switch (target) {
2004 case HTTP_REQUEST_STRBUF:
2005 strbuf_reset(result);
2006 break;
2007 case HTTP_REQUEST_FILE:
2008 if (fflush(result)) {
2009 error_errno("unable to flush a file");
2010 return HTTP_START_FAILED;
2011 }
2012 rewind(result);
2013 if (ftruncate(fileno(result), 0) < 0) {
2014 error_errno("unable to truncate a file");
2015 return HTTP_START_FAILED;
2016 }
2017 break;
2018 default:
2019 BUG("Unknown http_request target");
2020 }
2021
2022 credential_fill(&http_auth);
2023
2024 return http_request(url, result, target, options);
2025 }
2026
2027 int http_get_strbuf(const char *url,
2028 struct strbuf *result,
2029 struct http_get_options *options)
2030 {
2031 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
2032 }
2033
2034 /*
2035 * Downloads a URL and stores the result in the given file.
2036 *
2037 * If a previous interrupted download is detected (i.e. a previous temporary
2038 * file is still around) the download is resumed.
2039 */
2040 static int http_get_file(const char *url, const char *filename,
2041 struct http_get_options *options)
2042 {
2043 int ret;
2044 struct strbuf tmpfile = STRBUF_INIT;
2045 FILE *result;
2046
2047 strbuf_addf(&tmpfile, "%s.temp", filename);
2048 result = fopen(tmpfile.buf, "a");
2049 if (!result) {
2050 error("Unable to open local file %s", tmpfile.buf);
2051 ret = HTTP_ERROR;
2052 goto cleanup;
2053 }
2054
2055 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
2056 fclose(result);
2057
2058 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
2059 ret = HTTP_ERROR;
2060 cleanup:
2061 strbuf_release(&tmpfile);
2062 return ret;
2063 }
2064
2065 int http_fetch_ref(const char *base, struct ref *ref)
2066 {
2067 struct http_get_options options = {0};
2068 char *url;
2069 struct strbuf buffer = STRBUF_INIT;
2070 int ret = -1;
2071
2072 options.no_cache = 1;
2073
2074 url = quote_ref_url(base, ref->name);
2075 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
2076 strbuf_rtrim(&buffer);
2077 if (buffer.len == the_hash_algo->hexsz)
2078 ret = get_oid_hex(buffer.buf, &ref->old_oid);
2079 else if (starts_with(buffer.buf, "ref: ")) {
2080 ref->symref = xstrdup(buffer.buf + 5);
2081 ret = 0;
2082 }
2083 }
2084
2085 strbuf_release(&buffer);
2086 free(url);
2087 return ret;
2088 }
2089
2090 /* Helpers for fetching packs */
2091 static char *fetch_pack_index(unsigned char *hash, const char *base_url)
2092 {
2093 char *url, *tmp;
2094 struct strbuf buf = STRBUF_INIT;
2095
2096 if (http_is_verbose)
2097 fprintf(stderr, "Getting index for pack %s\n", hash_to_hex(hash));
2098
2099 end_url_with_slash(&buf, base_url);
2100 strbuf_addf(&buf, "objects/pack/pack-%s.idx", hash_to_hex(hash));
2101 url = strbuf_detach(&buf, NULL);
2102
2103 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(hash));
2104 tmp = strbuf_detach(&buf, NULL);
2105
2106 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
2107 error("Unable to get pack index %s", url);
2108 FREE_AND_NULL(tmp);
2109 }
2110
2111 free(url);
2112 return tmp;
2113 }
2114
2115 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
2116 unsigned char *sha1, const char *base_url)
2117 {
2118 struct packed_git *new_pack;
2119 char *tmp_idx = NULL;
2120 int ret;
2121
2122 if (has_pack_index(sha1)) {
2123 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
2124 if (!new_pack)
2125 return -1; /* parse_pack_index() already issued error message */
2126 goto add_pack;
2127 }
2128
2129 tmp_idx = fetch_pack_index(sha1, base_url);
2130 if (!tmp_idx)
2131 return -1;
2132
2133 new_pack = parse_pack_index(sha1, tmp_idx);
2134 if (!new_pack) {
2135 unlink(tmp_idx);
2136 free(tmp_idx);
2137
2138 return -1; /* parse_pack_index() already issued error message */
2139 }
2140
2141 ret = verify_pack_index(new_pack);
2142 if (!ret) {
2143 close_pack_index(new_pack);
2144 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
2145 }
2146 free(tmp_idx);
2147 if (ret)
2148 return -1;
2149
2150 add_pack:
2151 new_pack->next = *packs_head;
2152 *packs_head = new_pack;
2153 return 0;
2154 }
2155
2156 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
2157 {
2158 struct http_get_options options = {0};
2159 int ret = 0;
2160 char *url;
2161 const char *data;
2162 struct strbuf buf = STRBUF_INIT;
2163 struct object_id oid;
2164
2165 end_url_with_slash(&buf, base_url);
2166 strbuf_addstr(&buf, "objects/info/packs");
2167 url = strbuf_detach(&buf, NULL);
2168
2169 options.no_cache = 1;
2170 ret = http_get_strbuf(url, &buf, &options);
2171 if (ret != HTTP_OK)
2172 goto cleanup;
2173
2174 data = buf.buf;
2175 while (*data) {
2176 if (skip_prefix(data, "P pack-", &data) &&
2177 !parse_oid_hex(data, &oid, &data) &&
2178 skip_prefix(data, ".pack", &data) &&
2179 (*data == '\n' || *data == '\0')) {
2180 fetch_and_setup_pack_index(packs_head, oid.hash, base_url);
2181 } else {
2182 data = strchrnul(data, '\n');
2183 }
2184 if (*data)
2185 data++; /* skip past newline */
2186 }
2187
2188 cleanup:
2189 free(url);
2190 return ret;
2191 }
2192
2193 void release_http_pack_request(struct http_pack_request *preq)
2194 {
2195 if (preq->packfile != NULL) {
2196 fclose(preq->packfile);
2197 preq->packfile = NULL;
2198 }
2199 preq->slot = NULL;
2200 strbuf_release(&preq->tmpfile);
2201 free(preq->url);
2202 free(preq);
2203 }
2204
2205 int finish_http_pack_request(struct http_pack_request *preq)
2206 {
2207 struct packed_git **lst;
2208 struct packed_git *p = preq->target;
2209 char *tmp_idx;
2210 size_t len;
2211 struct child_process ip = CHILD_PROCESS_INIT;
2212
2213 close_pack_index(p);
2214
2215 fclose(preq->packfile);
2216 preq->packfile = NULL;
2217
2218 lst = preq->lst;
2219 while (*lst != p)
2220 lst = &((*lst)->next);
2221 *lst = (*lst)->next;
2222
2223 if (!strip_suffix(preq->tmpfile.buf, ".pack.temp", &len))
2224 BUG("pack tmpfile does not end in .pack.temp?");
2225 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile.buf);
2226
2227 argv_array_push(&ip.args, "index-pack");
2228 argv_array_pushl(&ip.args, "-o", tmp_idx, NULL);
2229 argv_array_push(&ip.args, preq->tmpfile.buf);
2230 ip.git_cmd = 1;
2231 ip.no_stdin = 1;
2232 ip.no_stdout = 1;
2233
2234 if (run_command(&ip)) {
2235 unlink(preq->tmpfile.buf);
2236 unlink(tmp_idx);
2237 free(tmp_idx);
2238 return -1;
2239 }
2240
2241 unlink(sha1_pack_index_name(p->hash));
2242
2243 if (finalize_object_file(preq->tmpfile.buf, sha1_pack_name(p->hash))
2244 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->hash))) {
2245 free(tmp_idx);
2246 return -1;
2247 }
2248
2249 install_packed_git(the_repository, p);
2250 free(tmp_idx);
2251 return 0;
2252 }
2253
2254 struct http_pack_request *new_http_pack_request(
2255 struct packed_git *target, const char *base_url)
2256 {
2257 off_t prev_posn = 0;
2258 struct strbuf buf = STRBUF_INIT;
2259 struct http_pack_request *preq;
2260
2261 preq = xcalloc(1, sizeof(*preq));
2262 strbuf_init(&preq->tmpfile, 0);
2263 preq->target = target;
2264
2265 end_url_with_slash(&buf, base_url);
2266 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2267 hash_to_hex(target->hash));
2268 preq->url = strbuf_detach(&buf, NULL);
2269
2270 strbuf_addf(&preq->tmpfile, "%s.temp", sha1_pack_name(target->hash));
2271 preq->packfile = fopen(preq->tmpfile.buf, "a");
2272 if (!preq->packfile) {
2273 error("Unable to open local file %s for pack",
2274 preq->tmpfile.buf);
2275 goto abort;
2276 }
2277
2278 preq->slot = get_active_slot();
2279 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2280 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2281 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2282 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2283 no_pragma_header);
2284
2285 /*
2286 * If there is data present from a previous transfer attempt,
2287 * resume where it left off
2288 */
2289 prev_posn = ftello(preq->packfile);
2290 if (prev_posn>0) {
2291 if (http_is_verbose)
2292 fprintf(stderr,
2293 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2294 hash_to_hex(target->hash),
2295 (uintmax_t)prev_posn);
2296 http_opt_request_remainder(preq->slot->curl, prev_posn);
2297 }
2298
2299 return preq;
2300
2301 abort:
2302 strbuf_release(&preq->tmpfile);
2303 free(preq->url);
2304 free(preq);
2305 return NULL;
2306 }
2307
2308 /* Helpers for fetching objects (loose) */
2309 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2310 void *data)
2311 {
2312 unsigned char expn[4096];
2313 size_t size = eltsize * nmemb;
2314 int posn = 0;
2315 struct http_object_request *freq = data;
2316 struct active_request_slot *slot = freq->slot;
2317
2318 if (slot) {
2319 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2320 &slot->http_code);
2321 if (c != CURLE_OK)
2322 BUG("curl_easy_getinfo for HTTP code failed: %s",
2323 curl_easy_strerror(c));
2324 if (slot->http_code >= 300)
2325 return nmemb;
2326 }
2327
2328 do {
2329 ssize_t retval = xwrite(freq->localfile,
2330 (char *) ptr + posn, size - posn);
2331 if (retval < 0)
2332 return posn / eltsize;
2333 posn += retval;
2334 } while (posn < size);
2335
2336 freq->stream.avail_in = size;
2337 freq->stream.next_in = (void *)ptr;
2338 do {
2339 freq->stream.next_out = expn;
2340 freq->stream.avail_out = sizeof(expn);
2341 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2342 the_hash_algo->update_fn(&freq->c, expn,
2343 sizeof(expn) - freq->stream.avail_out);
2344 } while (freq->stream.avail_in && freq->zret == Z_OK);
2345 return nmemb;
2346 }
2347
2348 struct http_object_request *new_http_object_request(const char *base_url,
2349 const struct object_id *oid)
2350 {
2351 char *hex = oid_to_hex(oid);
2352 struct strbuf filename = STRBUF_INIT;
2353 struct strbuf prevfile = STRBUF_INIT;
2354 int prevlocal;
2355 char prev_buf[PREV_BUF_SIZE];
2356 ssize_t prev_read = 0;
2357 off_t prev_posn = 0;
2358 struct http_object_request *freq;
2359
2360 freq = xcalloc(1, sizeof(*freq));
2361 strbuf_init(&freq->tmpfile, 0);
2362 oidcpy(&freq->oid, oid);
2363 freq->localfile = -1;
2364
2365 loose_object_path(the_repository, &filename, oid);
2366 strbuf_addf(&freq->tmpfile, "%s.temp", filename.buf);
2367
2368 strbuf_addf(&prevfile, "%s.prev", filename.buf);
2369 unlink_or_warn(prevfile.buf);
2370 rename(freq->tmpfile.buf, prevfile.buf);
2371 unlink_or_warn(freq->tmpfile.buf);
2372 strbuf_release(&filename);
2373
2374 if (freq->localfile != -1)
2375 error("fd leakage in start: %d", freq->localfile);
2376 freq->localfile = open(freq->tmpfile.buf,
2377 O_WRONLY | O_CREAT | O_EXCL, 0666);
2378 /*
2379 * This could have failed due to the "lazy directory creation";
2380 * try to mkdir the last path component.
2381 */
2382 if (freq->localfile < 0 && errno == ENOENT) {
2383 char *dir = strrchr(freq->tmpfile.buf, '/');
2384 if (dir) {
2385 *dir = 0;
2386 mkdir(freq->tmpfile.buf, 0777);
2387 *dir = '/';
2388 }
2389 freq->localfile = open(freq->tmpfile.buf,
2390 O_WRONLY | O_CREAT | O_EXCL, 0666);
2391 }
2392
2393 if (freq->localfile < 0) {
2394 error_errno("Couldn't create temporary file %s",
2395 freq->tmpfile.buf);
2396 goto abort;
2397 }
2398
2399 git_inflate_init(&freq->stream);
2400
2401 the_hash_algo->init_fn(&freq->c);
2402
2403 freq->url = get_remote_object_url(base_url, hex, 0);
2404
2405 /*
2406 * If a previous temp file is present, process what was already
2407 * fetched.
2408 */
2409 prevlocal = open(prevfile.buf, O_RDONLY);
2410 if (prevlocal != -1) {
2411 do {
2412 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2413 if (prev_read>0) {
2414 if (fwrite_sha1_file(prev_buf,
2415 1,
2416 prev_read,
2417 freq) == prev_read) {
2418 prev_posn += prev_read;
2419 } else {
2420 prev_read = -1;
2421 }
2422 }
2423 } while (prev_read > 0);
2424 close(prevlocal);
2425 }
2426 unlink_or_warn(prevfile.buf);
2427 strbuf_release(&prevfile);
2428
2429 /*
2430 * Reset inflate/SHA1 if there was an error reading the previous temp
2431 * file; also rewind to the beginning of the local file.
2432 */
2433 if (prev_read == -1) {
2434 memset(&freq->stream, 0, sizeof(freq->stream));
2435 git_inflate_init(&freq->stream);
2436 the_hash_algo->init_fn(&freq->c);
2437 if (prev_posn>0) {
2438 prev_posn = 0;
2439 lseek(freq->localfile, 0, SEEK_SET);
2440 if (ftruncate(freq->localfile, 0) < 0) {
2441 error_errno("Couldn't truncate temporary file %s",
2442 freq->tmpfile.buf);
2443 goto abort;
2444 }
2445 }
2446 }
2447
2448 freq->slot = get_active_slot();
2449
2450 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2451 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2452 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2453 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2454 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2455 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2456
2457 /*
2458 * If we have successfully processed data from a previous fetch
2459 * attempt, only fetch the data we don't already have.
2460 */
2461 if (prev_posn>0) {
2462 if (http_is_verbose)
2463 fprintf(stderr,
2464 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2465 hex, (uintmax_t)prev_posn);
2466 http_opt_request_remainder(freq->slot->curl, prev_posn);
2467 }
2468
2469 return freq;
2470
2471 abort:
2472 strbuf_release(&prevfile);
2473 free(freq->url);
2474 free(freq);
2475 return NULL;
2476 }
2477
2478 void process_http_object_request(struct http_object_request *freq)
2479 {
2480 if (freq->slot == NULL)
2481 return;
2482 freq->curl_result = freq->slot->curl_result;
2483 freq->http_code = freq->slot->http_code;
2484 freq->slot = NULL;
2485 }
2486
2487 int finish_http_object_request(struct http_object_request *freq)
2488 {
2489 struct stat st;
2490 struct strbuf filename = STRBUF_INIT;
2491
2492 close(freq->localfile);
2493 freq->localfile = -1;
2494
2495 process_http_object_request(freq);
2496
2497 if (freq->http_code == 416) {
2498 warning("requested range invalid; we may already have all the data.");
2499 } else if (freq->curl_result != CURLE_OK) {
2500 if (stat(freq->tmpfile.buf, &st) == 0)
2501 if (st.st_size == 0)
2502 unlink_or_warn(freq->tmpfile.buf);
2503 return -1;
2504 }
2505
2506 git_inflate_end(&freq->stream);
2507 the_hash_algo->final_fn(freq->real_oid.hash, &freq->c);
2508 if (freq->zret != Z_STREAM_END) {
2509 unlink_or_warn(freq->tmpfile.buf);
2510 return -1;
2511 }
2512 if (!oideq(&freq->oid, &freq->real_oid)) {
2513 unlink_or_warn(freq->tmpfile.buf);
2514 return -1;
2515 }
2516 loose_object_path(the_repository, &filename, &freq->oid);
2517 freq->rename = finalize_object_file(freq->tmpfile.buf, filename.buf);
2518 strbuf_release(&filename);
2519
2520 return freq->rename;
2521 }
2522
2523 void abort_http_object_request(struct http_object_request *freq)
2524 {
2525 unlink_or_warn(freq->tmpfile.buf);
2526
2527 release_http_object_request(freq);
2528 }
2529
2530 void release_http_object_request(struct http_object_request *freq)
2531 {
2532 if (freq->localfile != -1) {
2533 close(freq->localfile);
2534 freq->localfile = -1;
2535 }
2536 FREE_AND_NULL(freq->url);
2537 if (freq->slot != NULL) {
2538 freq->slot->callback_func = NULL;
2539 freq->slot->callback_data = NULL;
2540 release_active_slot(freq->slot);
2541 freq->slot = NULL;
2542 }
2543 strbuf_release(&freq->tmpfile);
2544 }
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