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built-in rebase: reinstate `checkout -q` behavior where appropriate
[git.git] / http.c
blob3dc8c560d65e7acebb22f63e797406e38afc6422
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 *ssl_cert;
52 static const char *ssl_cipherlist;
53 static const char *ssl_version;
54 static struct {
55 const char *name;
56 long ssl_version;
57 } sslversions[] = {
58 { "sslv2", CURL_SSLVERSION_SSLv2 },
59 { "sslv3", CURL_SSLVERSION_SSLv3 },
60 { "tlsv1", CURL_SSLVERSION_TLSv1 },
61 #if LIBCURL_VERSION_NUM >= 0x072200
62 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
63 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
64 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
65 #endif
66 #if LIBCURL_VERSION_NUM >= 0x073400
67 { "tlsv1.3", CURL_SSLVERSION_TLSv1_3 },
68 #endif
69 };
70 #if LIBCURL_VERSION_NUM >= 0x070903
71 static const char *ssl_key;
72 #endif
73 #if LIBCURL_VERSION_NUM >= 0x070908
74 static const char *ssl_capath;
75 #endif
76 #if LIBCURL_VERSION_NUM >= 0x071304
77 static const char *curl_no_proxy;
78 #endif
79 #if LIBCURL_VERSION_NUM >= 0x072c00
80 static const char *ssl_pinnedkey;
81 #endif
82 static const char *ssl_cainfo;
83 static long curl_low_speed_limit = -1;
84 static long curl_low_speed_time = -1;
85 static int curl_ftp_no_epsv;
86 static const char *curl_http_proxy;
87 static const char *http_proxy_authmethod;
88 static struct {
89 const char *name;
90 long curlauth_param;
91 } proxy_authmethods[] = {
92 { "basic", CURLAUTH_BASIC },
93 { "digest", CURLAUTH_DIGEST },
94 { "negotiate", CURLAUTH_GSSNEGOTIATE },
95 { "ntlm", CURLAUTH_NTLM },
96 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
97 { "anyauth", CURLAUTH_ANY },
98 #endif
99 /*
100 * CURLAUTH_DIGEST_IE has no corresponding command-line option in
101 * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
102 * here, too
103 */
104 };
105 #ifdef CURLGSSAPI_DELEGATION_FLAG
106 static const char *curl_deleg;
107 static struct {
108 const char *name;
109 long curl_deleg_param;
110 } curl_deleg_levels[] = {
111 { "none", CURLGSSAPI_DELEGATION_NONE },
112 { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
113 { "always", CURLGSSAPI_DELEGATION_FLAG },
114 };
115 #endif
116
117 static struct credential proxy_auth = CREDENTIAL_INIT;
118 static const char *curl_proxyuserpwd;
119 static const char *curl_cookie_file;
120 static int curl_save_cookies;
121 struct credential http_auth = CREDENTIAL_INIT;
122 static int http_proactive_auth;
123 static const char *user_agent;
124 static int curl_empty_auth = -1;
125
126 enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
127
128 #if LIBCURL_VERSION_NUM >= 0x071700
129 /* Use CURLOPT_KEYPASSWD as is */
130 #elif LIBCURL_VERSION_NUM >= 0x070903
131 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
132 #else
133 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
134 #endif
135
136 static struct credential cert_auth = CREDENTIAL_INIT;
137 static int ssl_cert_password_required;
138 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
139 static unsigned long http_auth_methods = CURLAUTH_ANY;
140 static int http_auth_methods_restricted;
141 /* Modes for which empty_auth cannot actually help us. */
142 static unsigned long empty_auth_useless =
143 CURLAUTH_BASIC
144 #ifdef CURLAUTH_DIGEST_IE
145 | CURLAUTH_DIGEST_IE
146 #endif
147 | CURLAUTH_DIGEST;
148 #endif
149
150 static struct curl_slist *pragma_header;
151 static struct curl_slist *no_pragma_header;
152 static struct curl_slist *extra_http_headers;
153
154 static struct active_request_slot *active_queue_head;
155
156 static char *cached_accept_language;
157
158 static char *http_ssl_backend;
159
160 static int http_schannel_check_revoke = 1;
161 /*
162 * With the backend being set to `schannel`, setting sslCAinfo would override
163 * the Certificate Store in cURL v7.60.0 and later, which is not what we want
164 * by default.
165 */
166 static int http_schannel_use_ssl_cainfo;
167
168 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
169 {
170 size_t size = eltsize * nmemb;
171 struct buffer *buffer = buffer_;
172
173 if (size > buffer->buf.len - buffer->posn)
174 size = buffer->buf.len - buffer->posn;
175 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
176 buffer->posn += size;
177
178 return size;
179 }
180
181 #ifndef NO_CURL_IOCTL
182 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
183 {
184 struct buffer *buffer = clientp;
185
186 switch (cmd) {
187 case CURLIOCMD_NOP:
188 return CURLIOE_OK;
189
190 case CURLIOCMD_RESTARTREAD:
191 buffer->posn = 0;
192 return CURLIOE_OK;
193
194 default:
195 return CURLIOE_UNKNOWNCMD;
196 }
197 }
198 #endif
199
200 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
201 {
202 size_t size = eltsize * nmemb;
203 struct strbuf *buffer = buffer_;
204
205 strbuf_add(buffer, ptr, size);
206 return size;
207 }
208
209 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
210 {
211 return eltsize * nmemb;
212 }
213
214 static void closedown_active_slot(struct active_request_slot *slot)
215 {
216 active_requests--;
217 slot->in_use = 0;
218 }
219
220 static void finish_active_slot(struct active_request_slot *slot)
221 {
222 closedown_active_slot(slot);
223 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
224
225 if (slot->finished != NULL)
226 (*slot->finished) = 1;
227
228 /* Store slot results so they can be read after the slot is reused */
229 if (slot->results != NULL) {
230 slot->results->curl_result = slot->curl_result;
231 slot->results->http_code = slot->http_code;
232 #if LIBCURL_VERSION_NUM >= 0x070a08
233 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
234 &slot->results->auth_avail);
235 #else
236 slot->results->auth_avail = 0;
237 #endif
238
239 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
240 &slot->results->http_connectcode);
241 }
242
243 /* Run callback if appropriate */
244 if (slot->callback_func != NULL)
245 slot->callback_func(slot->callback_data);
246 }
247
248 static void xmulti_remove_handle(struct active_request_slot *slot)
249 {
250 #ifdef USE_CURL_MULTI
251 curl_multi_remove_handle(curlm, slot->curl);
252 #endif
253 }
254
255 #ifdef USE_CURL_MULTI
256 static void process_curl_messages(void)
257 {
258 int num_messages;
259 struct active_request_slot *slot;
260 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
261
262 while (curl_message != NULL) {
263 if (curl_message->msg == CURLMSG_DONE) {
264 int curl_result = curl_message->data.result;
265 slot = active_queue_head;
266 while (slot != NULL &&
267 slot->curl != curl_message->easy_handle)
268 slot = slot->next;
269 if (slot != NULL) {
270 xmulti_remove_handle(slot);
271 slot->curl_result = curl_result;
272 finish_active_slot(slot);
273 } else {
274 fprintf(stderr, "Received DONE message for unknown request!\n");
275 }
276 } else {
277 fprintf(stderr, "Unknown CURL message received: %d\n",
278 (int)curl_message->msg);
279 }
280 curl_message = curl_multi_info_read(curlm, &num_messages);
281 }
282 }
283 #endif
284
285 static int http_options(const char *var, const char *value, void *cb)
286 {
287 if (!strcmp("http.sslverify", var)) {
288 curl_ssl_verify = git_config_bool(var, value);
289 return 0;
290 }
291 if (!strcmp("http.sslcipherlist", var))
292 return git_config_string(&ssl_cipherlist, var, value);
293 if (!strcmp("http.sslversion", var))
294 return git_config_string(&ssl_version, var, value);
295 if (!strcmp("http.sslcert", var))
296 return git_config_pathname(&ssl_cert, var, value);
297 #if LIBCURL_VERSION_NUM >= 0x070903
298 if (!strcmp("http.sslkey", var))
299 return git_config_pathname(&ssl_key, var, value);
300 #endif
301 #if LIBCURL_VERSION_NUM >= 0x070908
302 if (!strcmp("http.sslcapath", var))
303 return git_config_pathname(&ssl_capath, var, value);
304 #endif
305 if (!strcmp("http.sslcainfo", var))
306 return git_config_pathname(&ssl_cainfo, var, value);
307 if (!strcmp("http.sslcertpasswordprotected", var)) {
308 ssl_cert_password_required = git_config_bool(var, value);
309 return 0;
310 }
311 if (!strcmp("http.ssltry", var)) {
312 curl_ssl_try = git_config_bool(var, value);
313 return 0;
314 }
315 if (!strcmp("http.sslbackend", var)) {
316 free(http_ssl_backend);
317 http_ssl_backend = xstrdup_or_null(value);
318 return 0;
319 }
320
321 if (!strcmp("http.schannelcheckrevoke", var)) {
322 http_schannel_check_revoke = git_config_bool(var, value);
323 return 0;
324 }
325
326 if (!strcmp("http.schannelusesslcainfo", var)) {
327 http_schannel_use_ssl_cainfo = git_config_bool(var, value);
328 return 0;
329 }
330
331 if (!strcmp("http.minsessions", var)) {
332 min_curl_sessions = git_config_int(var, value);
333 #ifndef USE_CURL_MULTI
334 if (min_curl_sessions > 1)
335 min_curl_sessions = 1;
336 #endif
337 return 0;
338 }
339 #ifdef USE_CURL_MULTI
340 if (!strcmp("http.maxrequests", var)) {
341 max_requests = git_config_int(var, value);
342 return 0;
343 }
344 #endif
345 if (!strcmp("http.lowspeedlimit", var)) {
346 curl_low_speed_limit = (long)git_config_int(var, value);
347 return 0;
348 }
349 if (!strcmp("http.lowspeedtime", var)) {
350 curl_low_speed_time = (long)git_config_int(var, value);
351 return 0;
352 }
353
354 if (!strcmp("http.noepsv", var)) {
355 curl_ftp_no_epsv = git_config_bool(var, value);
356 return 0;
357 }
358 if (!strcmp("http.proxy", var))
359 return git_config_string(&curl_http_proxy, var, value);
360
361 if (!strcmp("http.proxyauthmethod", var))
362 return git_config_string(&http_proxy_authmethod, var, value);
363
364 if (!strcmp("http.cookiefile", var))
365 return git_config_pathname(&curl_cookie_file, var, value);
366 if (!strcmp("http.savecookies", var)) {
367 curl_save_cookies = git_config_bool(var, value);
368 return 0;
369 }
370
371 if (!strcmp("http.postbuffer", var)) {
372 http_post_buffer = git_config_ssize_t(var, value);
373 if (http_post_buffer < 0)
374 warning(_("negative value for http.postbuffer; defaulting to %d"), LARGE_PACKET_MAX);
375 if (http_post_buffer < LARGE_PACKET_MAX)
376 http_post_buffer = LARGE_PACKET_MAX;
377 return 0;
378 }
379
380 if (!strcmp("http.useragent", var))
381 return git_config_string(&user_agent, var, value);
382
383 if (!strcmp("http.emptyauth", var)) {
384 if (value && !strcmp("auto", value))
385 curl_empty_auth = -1;
386 else
387 curl_empty_auth = git_config_bool(var, value);
388 return 0;
389 }
390
391 if (!strcmp("http.delegation", var)) {
392 #ifdef CURLGSSAPI_DELEGATION_FLAG
393 return git_config_string(&curl_deleg, var, value);
394 #else
395 warning(_("Delegation control is not supported with cURL < 7.22.0"));
396 return 0;
397 #endif
398 }
399
400 if (!strcmp("http.pinnedpubkey", var)) {
401 #if LIBCURL_VERSION_NUM >= 0x072c00
402 return git_config_pathname(&ssl_pinnedkey, var, value);
403 #else
404 warning(_("Public key pinning not supported with cURL < 7.44.0"));
405 return 0;
406 #endif
407 }
408
409 if (!strcmp("http.extraheader", var)) {
410 if (!value) {
411 return config_error_nonbool(var);
412 } else if (!*value) {
413 curl_slist_free_all(extra_http_headers);
414 extra_http_headers = NULL;
415 } else {
416 extra_http_headers =
417 curl_slist_append(extra_http_headers, value);
418 }
419 return 0;
420 }
421
422 if (!strcmp("http.followredirects", var)) {
423 if (value && !strcmp(value, "initial"))
424 http_follow_config = HTTP_FOLLOW_INITIAL;
425 else if (git_config_bool(var, value))
426 http_follow_config = HTTP_FOLLOW_ALWAYS;
427 else
428 http_follow_config = HTTP_FOLLOW_NONE;
429 return 0;
430 }
431
432 /* Fall back on the default ones */
433 return git_default_config(var, value, cb);
434 }
435
436 static int curl_empty_auth_enabled(void)
437 {
438 if (curl_empty_auth >= 0)
439 return curl_empty_auth;
440
441 #ifndef LIBCURL_CAN_HANDLE_AUTH_ANY
442 /*
443 * Our libcurl is too old to do AUTH_ANY in the first place;
444 * just default to turning the feature off.
445 */
446 #else
447 /*
448 * In the automatic case, kick in the empty-auth
449 * hack as long as we would potentially try some
450 * method more exotic than "Basic" or "Digest".
451 *
452 * But only do this when this is our second or
453 * subsequent request, as by then we know what
454 * methods are available.
455 */
456 if (http_auth_methods_restricted &&
457 (http_auth_methods & ~empty_auth_useless))
458 return 1;
459 #endif
460 return 0;
461 }
462
463 static void init_curl_http_auth(CURL *result)
464 {
465 if (!http_auth.username || !*http_auth.username) {
466 if (curl_empty_auth_enabled())
467 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
468 return;
469 }
470
471 credential_fill(&http_auth);
472
473 #if LIBCURL_VERSION_NUM >= 0x071301
474 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
475 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
476 #else
477 {
478 static struct strbuf up = STRBUF_INIT;
479 /*
480 * Note that we assume we only ever have a single set of
481 * credentials in a given program run, so we do not have
482 * to worry about updating this buffer, only setting its
483 * initial value.
484 */
485 if (!up.len)
486 strbuf_addf(&up, "%s:%s",
487 http_auth.username, http_auth.password);
488 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
489 }
490 #endif
491 }
492
493 /* *var must be free-able */
494 static void var_override(const char **var, char *value)
495 {
496 if (value) {
497 free((void *)*var);
498 *var = xstrdup(value);
499 }
500 }
501
502 static void set_proxyauth_name_password(CURL *result)
503 {
504 #if LIBCURL_VERSION_NUM >= 0x071301
505 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
506 proxy_auth.username);
507 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
508 proxy_auth.password);
509 #else
510 struct strbuf s = STRBUF_INIT;
511
512 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
513 strbuf_addch(&s, ':');
514 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
515 curl_proxyuserpwd = strbuf_detach(&s, NULL);
516 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
517 #endif
518 }
519
520 static void init_curl_proxy_auth(CURL *result)
521 {
522 if (proxy_auth.username) {
523 if (!proxy_auth.password)
524 credential_fill(&proxy_auth);
525 set_proxyauth_name_password(result);
526 }
527
528 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
529
530 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
531 if (http_proxy_authmethod) {
532 int i;
533 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
534 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
535 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
536 proxy_authmethods[i].curlauth_param);
537 break;
538 }
539 }
540 if (i == ARRAY_SIZE(proxy_authmethods)) {
541 warning("unsupported proxy authentication method %s: using anyauth",
542 http_proxy_authmethod);
543 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
544 }
545 }
546 else
547 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
548 #endif
549 }
550
551 static int has_cert_password(void)
552 {
553 if (ssl_cert == NULL || ssl_cert_password_required != 1)
554 return 0;
555 if (!cert_auth.password) {
556 cert_auth.protocol = xstrdup("cert");
557 cert_auth.username = xstrdup("");
558 cert_auth.path = xstrdup(ssl_cert);
559 credential_fill(&cert_auth);
560 }
561 return 1;
562 }
563
564 #if LIBCURL_VERSION_NUM >= 0x071900
565 static void set_curl_keepalive(CURL *c)
566 {
567 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
568 }
569
570 #elif LIBCURL_VERSION_NUM >= 0x071000
571 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
572 {
573 int ka = 1;
574 int rc;
575 socklen_t len = (socklen_t)sizeof(ka);
576
577 if (type != CURLSOCKTYPE_IPCXN)
578 return 0;
579
580 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
581 if (rc < 0)
582 warning_errno("unable to set SO_KEEPALIVE on socket");
583
584 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
585 }
586
587 static void set_curl_keepalive(CURL *c)
588 {
589 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
590 }
591
592 #else
593 static void set_curl_keepalive(CURL *c)
594 {
595 /* not supported on older curl versions */
596 }
597 #endif
598
599 static void redact_sensitive_header(struct strbuf *header)
600 {
601 const char *sensitive_header;
602
603 if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
604 skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
605 /* The first token is the type, which is OK to log */
606 while (isspace(*sensitive_header))
607 sensitive_header++;
608 while (*sensitive_header && !isspace(*sensitive_header))
609 sensitive_header++;
610 /* Everything else is opaque and possibly sensitive */
611 strbuf_setlen(header, sensitive_header - header->buf);
612 strbuf_addstr(header, " <redacted>");
613 } else if (cookies_to_redact.nr &&
614 skip_prefix(header->buf, "Cookie:", &sensitive_header)) {
615 struct strbuf redacted_header = STRBUF_INIT;
616 char *cookie;
617
618 while (isspace(*sensitive_header))
619 sensitive_header++;
620
621 /*
622 * The contents of header starting from sensitive_header will
623 * subsequently be overridden, so it is fine to mutate this
624 * string (hence the assignment to "char *").
625 */
626 cookie = (char *) sensitive_header;
627
628 while (cookie) {
629 char *equals;
630 char *semicolon = strstr(cookie, "; ");
631 if (semicolon)
632 *semicolon = 0;
633 equals = strchrnul(cookie, '=');
634 if (!equals) {
635 /* invalid cookie, just append and continue */
636 strbuf_addstr(&redacted_header, cookie);
637 continue;
638 }
639 *equals = 0; /* temporarily set to NUL for lookup */
640 if (string_list_lookup(&cookies_to_redact, cookie)) {
641 strbuf_addstr(&redacted_header, cookie);
642 strbuf_addstr(&redacted_header, "=<redacted>");
643 } else {
644 *equals = '=';
645 strbuf_addstr(&redacted_header, cookie);
646 }
647 if (semicolon) {
648 /*
649 * There are more cookies. (Or, for some
650 * reason, the input string ends in "; ".)
651 */
652 strbuf_addstr(&redacted_header, "; ");
653 cookie = semicolon + strlen("; ");
654 } else {
655 cookie = NULL;
656 }
657 }
658
659 strbuf_setlen(header, sensitive_header - header->buf);
660 strbuf_addbuf(header, &redacted_header);
661 }
662 }
663
664 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
665 {
666 struct strbuf out = STRBUF_INIT;
667 struct strbuf **headers, **header;
668
669 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
670 text, (long)size, (long)size);
671 trace_strbuf(&trace_curl, &out);
672 strbuf_reset(&out);
673 strbuf_add(&out, ptr, size);
674 headers = strbuf_split_max(&out, '\n', 0);
675
676 for (header = headers; *header; header++) {
677 if (hide_sensitive_header)
678 redact_sensitive_header(*header);
679 strbuf_insert((*header), 0, text, strlen(text));
680 strbuf_insert((*header), strlen(text), ": ", 2);
681 strbuf_rtrim((*header));
682 strbuf_addch((*header), '\n');
683 trace_strbuf(&trace_curl, (*header));
684 }
685 strbuf_list_free(headers);
686 strbuf_release(&out);
687 }
688
689 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
690 {
691 size_t i;
692 struct strbuf out = STRBUF_INIT;
693 unsigned int width = 60;
694
695 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
696 text, (long)size, (long)size);
697 trace_strbuf(&trace_curl, &out);
698
699 for (i = 0; i < size; i += width) {
700 size_t w;
701
702 strbuf_reset(&out);
703 strbuf_addf(&out, "%s: ", text);
704 for (w = 0; (w < width) && (i + w < size); w++) {
705 unsigned char ch = ptr[i + w];
706
707 strbuf_addch(&out,
708 (ch >= 0x20) && (ch < 0x80)
709 ? ch : '.');
710 }
711 strbuf_addch(&out, '\n');
712 trace_strbuf(&trace_curl, &out);
713 }
714 strbuf_release(&out);
715 }
716
717 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
718 {
719 const char *text;
720 enum { NO_FILTER = 0, DO_FILTER = 1 };
721
722 switch (type) {
723 case CURLINFO_TEXT:
724 trace_printf_key(&trace_curl, "== Info: %s", data);
725 break;
726 case CURLINFO_HEADER_OUT:
727 text = "=> Send header";
728 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
729 break;
730 case CURLINFO_DATA_OUT:
731 if (trace_curl_data) {
732 text = "=> Send data";
733 curl_dump_data(text, (unsigned char *)data, size);
734 }
735 break;
736 case CURLINFO_SSL_DATA_OUT:
737 if (trace_curl_data) {
738 text = "=> Send SSL data";
739 curl_dump_data(text, (unsigned char *)data, size);
740 }
741 break;
742 case CURLINFO_HEADER_IN:
743 text = "<= Recv header";
744 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
745 break;
746 case CURLINFO_DATA_IN:
747 if (trace_curl_data) {
748 text = "<= Recv data";
749 curl_dump_data(text, (unsigned char *)data, size);
750 }
751 break;
752 case CURLINFO_SSL_DATA_IN:
753 if (trace_curl_data) {
754 text = "<= Recv SSL data";
755 curl_dump_data(text, (unsigned char *)data, size);
756 }
757 break;
758
759 default: /* we ignore unknown types by default */
760 return 0;
761 }
762 return 0;
763 }
764
765 void setup_curl_trace(CURL *handle)
766 {
767 if (!trace_want(&trace_curl))
768 return;
769 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
770 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
771 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
772 }
773
774 #ifdef CURLPROTO_HTTP
775 static long get_curl_allowed_protocols(int from_user)
776 {
777 long allowed_protocols = 0;
778
779 if (is_transport_allowed("http", from_user))
780 allowed_protocols |= CURLPROTO_HTTP;
781 if (is_transport_allowed("https", from_user))
782 allowed_protocols |= CURLPROTO_HTTPS;
783 if (is_transport_allowed("ftp", from_user))
784 allowed_protocols |= CURLPROTO_FTP;
785 if (is_transport_allowed("ftps", from_user))
786 allowed_protocols |= CURLPROTO_FTPS;
787
788 return allowed_protocols;
789 }
790 #endif
791
792 static CURL *get_curl_handle(void)
793 {
794 CURL *result = curl_easy_init();
795
796 if (!result)
797 die("curl_easy_init failed");
798
799 if (!curl_ssl_verify) {
800 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
801 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
802 } else {
803 /* Verify authenticity of the peer's certificate */
804 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
805 /* The name in the cert must match whom we tried to connect */
806 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
807 }
808
809 #if LIBCURL_VERSION_NUM >= 0x070907
810 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
811 #endif
812 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
813 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
814 #endif
815
816 #ifdef CURLGSSAPI_DELEGATION_FLAG
817 if (curl_deleg) {
818 int i;
819 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
820 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
821 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
822 curl_deleg_levels[i].curl_deleg_param);
823 break;
824 }
825 }
826 if (i == ARRAY_SIZE(curl_deleg_levels))
827 warning("Unknown delegation method '%s': using default",
828 curl_deleg);
829 }
830 #endif
831
832 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
833 !http_schannel_check_revoke) {
834 #if LIBCURL_VERSION_NUM >= 0x072c00
835 curl_easy_setopt(result, CURLOPT_SSL_OPTIONS, CURLSSLOPT_NO_REVOKE);
836 #else
837 warning(_("CURLSSLOPT_NO_REVOKE not suported with cURL < 7.44.0"));
838 #endif
839 }
840
841 if (http_proactive_auth)
842 init_curl_http_auth(result);
843
844 if (getenv("GIT_SSL_VERSION"))
845 ssl_version = getenv("GIT_SSL_VERSION");
846 if (ssl_version && *ssl_version) {
847 int i;
848 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
849 if (!strcmp(ssl_version, sslversions[i].name)) {
850 curl_easy_setopt(result, CURLOPT_SSLVERSION,
851 sslversions[i].ssl_version);
852 break;
853 }
854 }
855 if (i == ARRAY_SIZE(sslversions))
856 warning("unsupported ssl version %s: using default",
857 ssl_version);
858 }
859
860 if (getenv("GIT_SSL_CIPHER_LIST"))
861 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
862 if (ssl_cipherlist != NULL && *ssl_cipherlist)
863 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
864 ssl_cipherlist);
865
866 if (ssl_cert != NULL)
867 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
868 if (has_cert_password())
869 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
870 #if LIBCURL_VERSION_NUM >= 0x070903
871 if (ssl_key != NULL)
872 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
873 #endif
874 #if LIBCURL_VERSION_NUM >= 0x070908
875 if (ssl_capath != NULL)
876 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
877 #endif
878 #if LIBCURL_VERSION_NUM >= 0x072c00
879 if (ssl_pinnedkey != NULL)
880 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
881 #endif
882 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
883 !http_schannel_use_ssl_cainfo) {
884 curl_easy_setopt(result, CURLOPT_CAINFO, NULL);
885 #if LIBCURL_VERSION_NUM >= 0x073400
886 curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, NULL);
887 #endif
888 } else if (ssl_cainfo != NULL)
889 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
890
891 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
892 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
893 curl_low_speed_limit);
894 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
895 curl_low_speed_time);
896 }
897
898 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
899 #if LIBCURL_VERSION_NUM >= 0x071301
900 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
901 #elif LIBCURL_VERSION_NUM >= 0x071101
902 curl_easy_setopt(result, CURLOPT_POST301, 1);
903 #endif
904 #ifdef CURLPROTO_HTTP
905 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
906 get_curl_allowed_protocols(0));
907 curl_easy_setopt(result, CURLOPT_PROTOCOLS,
908 get_curl_allowed_protocols(-1));
909 #else
910 warning(_("Protocol restrictions not supported with cURL < 7.19.4"));
911 #endif
912 if (getenv("GIT_CURL_VERBOSE"))
913 curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
914 setup_curl_trace(result);
915 if (getenv("GIT_TRACE_CURL_NO_DATA"))
916 trace_curl_data = 0;
917 if (getenv("GIT_REDACT_COOKIES")) {
918 string_list_split(&cookies_to_redact,
919 getenv("GIT_REDACT_COOKIES"), ',', -1);
920 string_list_sort(&cookies_to_redact);
921 }
922
923 curl_easy_setopt(result, CURLOPT_USERAGENT,
924 user_agent ? user_agent : git_user_agent());
925
926 if (curl_ftp_no_epsv)
927 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
928
929 #ifdef CURLOPT_USE_SSL
930 if (curl_ssl_try)
931 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
932 #endif
933
934 /*
935 * CURL also examines these variables as a fallback; but we need to query
936 * them here in order to decide whether to prompt for missing password (cf.
937 * init_curl_proxy_auth()).
938 *
939 * Unlike many other common environment variables, these are historically
940 * lowercase only. It appears that CURL did not know this and implemented
941 * only uppercase variants, which was later corrected to take both - with
942 * the exception of http_proxy, which is lowercase only also in CURL. As
943 * the lowercase versions are the historical quasi-standard, they take
944 * precedence here, as in CURL.
945 */
946 if (!curl_http_proxy) {
947 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
948 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
949 var_override(&curl_http_proxy, getenv("https_proxy"));
950 } else {
951 var_override(&curl_http_proxy, getenv("http_proxy"));
952 }
953 if (!curl_http_proxy) {
954 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
955 var_override(&curl_http_proxy, getenv("all_proxy"));
956 }
957 }
958
959 if (curl_http_proxy && curl_http_proxy[0] == '\0') {
960 /*
961 * Handle case with the empty http.proxy value here to keep
962 * common code clean.
963 * NB: empty option disables proxying at all.
964 */
965 curl_easy_setopt(result, CURLOPT_PROXY, "");
966 } else if (curl_http_proxy) {
967 #if LIBCURL_VERSION_NUM >= 0x071800
968 if (starts_with(curl_http_proxy, "socks5h"))
969 curl_easy_setopt(result,
970 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
971 else if (starts_with(curl_http_proxy, "socks5"))
972 curl_easy_setopt(result,
973 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
974 else if (starts_with(curl_http_proxy, "socks4a"))
975 curl_easy_setopt(result,
976 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
977 else if (starts_with(curl_http_proxy, "socks"))
978 curl_easy_setopt(result,
979 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
980 #endif
981 #if LIBCURL_VERSION_NUM >= 0x073400
982 else if (starts_with(curl_http_proxy, "https"))
983 curl_easy_setopt(result,
984 CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
985 #endif
986 if (strstr(curl_http_proxy, "://"))
987 credential_from_url(&proxy_auth, curl_http_proxy);
988 else {
989 struct strbuf url = STRBUF_INIT;
990 strbuf_addf(&url, "http://%s", curl_http_proxy);
991 credential_from_url(&proxy_auth, url.buf);
992 strbuf_release(&url);
993 }
994
995 if (!proxy_auth.host)
996 die("Invalid proxy URL '%s'", curl_http_proxy);
997
998 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
999 #if LIBCURL_VERSION_NUM >= 0x071304
1000 var_override(&curl_no_proxy, getenv("NO_PROXY"));
1001 var_override(&curl_no_proxy, getenv("no_proxy"));
1002 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
1003 #endif
1004 }
1005 init_curl_proxy_auth(result);
1006
1007 set_curl_keepalive(result);
1008
1009 return result;
1010 }
1011
1012 static void set_from_env(const char **var, const char *envname)
1013 {
1014 const char *val = getenv(envname);
1015 if (val)
1016 *var = val;
1017 }
1018
1019 void http_init(struct remote *remote, const char *url, int proactive_auth)
1020 {
1021 char *low_speed_limit;
1022 char *low_speed_time;
1023 char *normalized_url;
1024 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
1025
1026 config.section = "http";
1027 config.key = NULL;
1028 config.collect_fn = http_options;
1029 config.cascade_fn = git_default_config;
1030 config.cb = NULL;
1031
1032 http_is_verbose = 0;
1033 normalized_url = url_normalize(url, &config.url);
1034
1035 git_config(urlmatch_config_entry, &config);
1036 free(normalized_url);
1037
1038 #if LIBCURL_VERSION_NUM >= 0x073800
1039 if (http_ssl_backend) {
1040 const curl_ssl_backend **backends;
1041 struct strbuf buf = STRBUF_INIT;
1042 int i;
1043
1044 switch (curl_global_sslset(-1, http_ssl_backend, &backends)) {
1045 case CURLSSLSET_UNKNOWN_BACKEND:
1046 strbuf_addf(&buf, _("Unsupported SSL backend '%s'. "
1047 "Supported SSL backends:"),
1048 http_ssl_backend);
1049 for (i = 0; backends[i]; i++)
1050 strbuf_addf(&buf, "\n\t%s", backends[i]->name);
1051 die("%s", buf.buf);
1052 case CURLSSLSET_NO_BACKENDS:
1053 die(_("Could not set SSL backend to '%s': "
1054 "cURL was built without SSL backends"),
1055 http_ssl_backend);
1056 case CURLSSLSET_TOO_LATE:
1057 die(_("Could not set SSL backend to '%s': already set"),
1058 http_ssl_backend);
1059 case CURLSSLSET_OK:
1060 break; /* Okay! */
1061 }
1062 }
1063 #endif
1064
1065 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1066 die("curl_global_init failed");
1067
1068 http_proactive_auth = proactive_auth;
1069
1070 if (remote && remote->http_proxy)
1071 curl_http_proxy = xstrdup(remote->http_proxy);
1072
1073 if (remote)
1074 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
1075
1076 pragma_header = curl_slist_append(http_copy_default_headers(),
1077 "Pragma: no-cache");
1078 no_pragma_header = curl_slist_append(http_copy_default_headers(),
1079 "Pragma:");
1080
1081 #ifdef USE_CURL_MULTI
1082 {
1083 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1084 if (http_max_requests != NULL)
1085 max_requests = atoi(http_max_requests);
1086 }
1087
1088 curlm = curl_multi_init();
1089 if (!curlm)
1090 die("curl_multi_init failed");
1091 #endif
1092
1093 if (getenv("GIT_SSL_NO_VERIFY"))
1094 curl_ssl_verify = 0;
1095
1096 set_from_env(&ssl_cert, "GIT_SSL_CERT");
1097 #if LIBCURL_VERSION_NUM >= 0x070903
1098 set_from_env(&ssl_key, "GIT_SSL_KEY");
1099 #endif
1100 #if LIBCURL_VERSION_NUM >= 0x070908
1101 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
1102 #endif
1103 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
1104
1105 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
1106
1107 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1108 if (low_speed_limit != NULL)
1109 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1110 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1111 if (low_speed_time != NULL)
1112 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1113
1114 if (curl_ssl_verify == -1)
1115 curl_ssl_verify = 1;
1116
1117 curl_session_count = 0;
1118 #ifdef USE_CURL_MULTI
1119 if (max_requests < 1)
1120 max_requests = DEFAULT_MAX_REQUESTS;
1121 #endif
1122
1123 if (getenv("GIT_CURL_FTP_NO_EPSV"))
1124 curl_ftp_no_epsv = 1;
1125
1126 if (url) {
1127 credential_from_url(&http_auth, url);
1128 if (!ssl_cert_password_required &&
1129 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1130 starts_with(url, "https://"))
1131 ssl_cert_password_required = 1;
1132 }
1133
1134 #ifndef NO_CURL_EASY_DUPHANDLE
1135 curl_default = get_curl_handle();
1136 #endif
1137 }
1138
1139 void http_cleanup(void)
1140 {
1141 struct active_request_slot *slot = active_queue_head;
1142
1143 while (slot != NULL) {
1144 struct active_request_slot *next = slot->next;
1145 if (slot->curl != NULL) {
1146 xmulti_remove_handle(slot);
1147 curl_easy_cleanup(slot->curl);
1148 }
1149 free(slot);
1150 slot = next;
1151 }
1152 active_queue_head = NULL;
1153
1154 #ifndef NO_CURL_EASY_DUPHANDLE
1155 curl_easy_cleanup(curl_default);
1156 #endif
1157
1158 #ifdef USE_CURL_MULTI
1159 curl_multi_cleanup(curlm);
1160 #endif
1161 curl_global_cleanup();
1162
1163 curl_slist_free_all(extra_http_headers);
1164 extra_http_headers = NULL;
1165
1166 curl_slist_free_all(pragma_header);
1167 pragma_header = NULL;
1168
1169 curl_slist_free_all(no_pragma_header);
1170 no_pragma_header = NULL;
1171
1172 if (curl_http_proxy) {
1173 free((void *)curl_http_proxy);
1174 curl_http_proxy = NULL;
1175 }
1176
1177 if (proxy_auth.password) {
1178 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1179 FREE_AND_NULL(proxy_auth.password);
1180 }
1181
1182 free((void *)curl_proxyuserpwd);
1183 curl_proxyuserpwd = NULL;
1184
1185 free((void *)http_proxy_authmethod);
1186 http_proxy_authmethod = NULL;
1187
1188 if (cert_auth.password != NULL) {
1189 memset(cert_auth.password, 0, strlen(cert_auth.password));
1190 FREE_AND_NULL(cert_auth.password);
1191 }
1192 ssl_cert_password_required = 0;
1193
1194 FREE_AND_NULL(cached_accept_language);
1195 }
1196
1197 struct active_request_slot *get_active_slot(void)
1198 {
1199 struct active_request_slot *slot = active_queue_head;
1200 struct active_request_slot *newslot;
1201
1202 #ifdef USE_CURL_MULTI
1203 int num_transfers;
1204
1205 /* Wait for a slot to open up if the queue is full */
1206 while (active_requests >= max_requests) {
1207 curl_multi_perform(curlm, &num_transfers);
1208 if (num_transfers < active_requests)
1209 process_curl_messages();
1210 }
1211 #endif
1212
1213 while (slot != NULL && slot->in_use)
1214 slot = slot->next;
1215
1216 if (slot == NULL) {
1217 newslot = xmalloc(sizeof(*newslot));
1218 newslot->curl = NULL;
1219 newslot->in_use = 0;
1220 newslot->next = NULL;
1221
1222 slot = active_queue_head;
1223 if (slot == NULL) {
1224 active_queue_head = newslot;
1225 } else {
1226 while (slot->next != NULL)
1227 slot = slot->next;
1228 slot->next = newslot;
1229 }
1230 slot = newslot;
1231 }
1232
1233 if (slot->curl == NULL) {
1234 #ifdef NO_CURL_EASY_DUPHANDLE
1235 slot->curl = get_curl_handle();
1236 #else
1237 slot->curl = curl_easy_duphandle(curl_default);
1238 #endif
1239 curl_session_count++;
1240 }
1241
1242 active_requests++;
1243 slot->in_use = 1;
1244 slot->results = NULL;
1245 slot->finished = NULL;
1246 slot->callback_data = NULL;
1247 slot->callback_func = NULL;
1248 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1249 if (curl_save_cookies)
1250 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1251 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1252 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1253 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1254 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1255 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1256 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1257 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1258 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1259 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1260 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1261
1262 /*
1263 * Default following to off unless "ALWAYS" is configured; this gives
1264 * callers a sane starting point, and they can tweak for individual
1265 * HTTP_FOLLOW_* cases themselves.
1266 */
1267 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1268 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1269 else
1270 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1271
1272 #if LIBCURL_VERSION_NUM >= 0x070a08
1273 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1274 #endif
1275 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1276 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1277 #endif
1278 if (http_auth.password || curl_empty_auth_enabled())
1279 init_curl_http_auth(slot->curl);
1280
1281 return slot;
1282 }
1283
1284 int start_active_slot(struct active_request_slot *slot)
1285 {
1286 #ifdef USE_CURL_MULTI
1287 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1288 int num_transfers;
1289
1290 if (curlm_result != CURLM_OK &&
1291 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1292 warning("curl_multi_add_handle failed: %s",
1293 curl_multi_strerror(curlm_result));
1294 active_requests--;
1295 slot->in_use = 0;
1296 return 0;
1297 }
1298
1299 /*
1300 * We know there must be something to do, since we just added
1301 * something.
1302 */
1303 curl_multi_perform(curlm, &num_transfers);
1304 #endif
1305 return 1;
1306 }
1307
1308 #ifdef USE_CURL_MULTI
1309 struct fill_chain {
1310 void *data;
1311 int (*fill)(void *);
1312 struct fill_chain *next;
1313 };
1314
1315 static struct fill_chain *fill_cfg;
1316
1317 void add_fill_function(void *data, int (*fill)(void *))
1318 {
1319 struct fill_chain *new_fill = xmalloc(sizeof(*new_fill));
1320 struct fill_chain **linkp = &fill_cfg;
1321 new_fill->data = data;
1322 new_fill->fill = fill;
1323 new_fill->next = NULL;
1324 while (*linkp)
1325 linkp = &(*linkp)->next;
1326 *linkp = new_fill;
1327 }
1328
1329 void fill_active_slots(void)
1330 {
1331 struct active_request_slot *slot = active_queue_head;
1332
1333 while (active_requests < max_requests) {
1334 struct fill_chain *fill;
1335 for (fill = fill_cfg; fill; fill = fill->next)
1336 if (fill->fill(fill->data))
1337 break;
1338
1339 if (!fill)
1340 break;
1341 }
1342
1343 while (slot != NULL) {
1344 if (!slot->in_use && slot->curl != NULL
1345 && curl_session_count > min_curl_sessions) {
1346 curl_easy_cleanup(slot->curl);
1347 slot->curl = NULL;
1348 curl_session_count--;
1349 }
1350 slot = slot->next;
1351 }
1352 }
1353
1354 void step_active_slots(void)
1355 {
1356 int num_transfers;
1357 CURLMcode curlm_result;
1358
1359 do {
1360 curlm_result = curl_multi_perform(curlm, &num_transfers);
1361 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1362 if (num_transfers < active_requests) {
1363 process_curl_messages();
1364 fill_active_slots();
1365 }
1366 }
1367 #endif
1368
1369 void run_active_slot(struct active_request_slot *slot)
1370 {
1371 #ifdef USE_CURL_MULTI
1372 fd_set readfds;
1373 fd_set writefds;
1374 fd_set excfds;
1375 int max_fd;
1376 struct timeval select_timeout;
1377 int finished = 0;
1378
1379 slot->finished = &finished;
1380 while (!finished) {
1381 step_active_slots();
1382
1383 if (slot->in_use) {
1384 #if LIBCURL_VERSION_NUM >= 0x070f04
1385 long curl_timeout;
1386 curl_multi_timeout(curlm, &curl_timeout);
1387 if (curl_timeout == 0) {
1388 continue;
1389 } else if (curl_timeout == -1) {
1390 select_timeout.tv_sec = 0;
1391 select_timeout.tv_usec = 50000;
1392 } else {
1393 select_timeout.tv_sec = curl_timeout / 1000;
1394 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1395 }
1396 #else
1397 select_timeout.tv_sec = 0;
1398 select_timeout.tv_usec = 50000;
1399 #endif
1400
1401 max_fd = -1;
1402 FD_ZERO(&readfds);
1403 FD_ZERO(&writefds);
1404 FD_ZERO(&excfds);
1405 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1406
1407 /*
1408 * It can happen that curl_multi_timeout returns a pathologically
1409 * long timeout when curl_multi_fdset returns no file descriptors
1410 * to read. See commit message for more details.
1411 */
1412 if (max_fd < 0 &&
1413 (select_timeout.tv_sec > 0 ||
1414 select_timeout.tv_usec > 50000)) {
1415 select_timeout.tv_sec = 0;
1416 select_timeout.tv_usec = 50000;
1417 }
1418
1419 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1420 }
1421 }
1422 #else
1423 while (slot->in_use) {
1424 slot->curl_result = curl_easy_perform(slot->curl);
1425 finish_active_slot(slot);
1426 }
1427 #endif
1428 }
1429
1430 static void release_active_slot(struct active_request_slot *slot)
1431 {
1432 closedown_active_slot(slot);
1433 if (slot->curl) {
1434 xmulti_remove_handle(slot);
1435 if (curl_session_count > min_curl_sessions) {
1436 curl_easy_cleanup(slot->curl);
1437 slot->curl = NULL;
1438 curl_session_count--;
1439 }
1440 }
1441 #ifdef USE_CURL_MULTI
1442 fill_active_slots();
1443 #endif
1444 }
1445
1446 void finish_all_active_slots(void)
1447 {
1448 struct active_request_slot *slot = active_queue_head;
1449
1450 while (slot != NULL)
1451 if (slot->in_use) {
1452 run_active_slot(slot);
1453 slot = active_queue_head;
1454 } else {
1455 slot = slot->next;
1456 }
1457 }
1458
1459 /* Helpers for modifying and creating URLs */
1460 static inline int needs_quote(int ch)
1461 {
1462 if (((ch >= 'A') && (ch <= 'Z'))
1463 || ((ch >= 'a') && (ch <= 'z'))
1464 || ((ch >= '0') && (ch <= '9'))
1465 || (ch == '/')
1466 || (ch == '-')
1467 || (ch == '.'))
1468 return 0;
1469 return 1;
1470 }
1471
1472 static char *quote_ref_url(const char *base, const char *ref)
1473 {
1474 struct strbuf buf = STRBUF_INIT;
1475 const char *cp;
1476 int ch;
1477
1478 end_url_with_slash(&buf, base);
1479
1480 for (cp = ref; (ch = *cp) != 0; cp++)
1481 if (needs_quote(ch))
1482 strbuf_addf(&buf, "%%%02x", ch);
1483 else
1484 strbuf_addch(&buf, *cp);
1485
1486 return strbuf_detach(&buf, NULL);
1487 }
1488
1489 void append_remote_object_url(struct strbuf *buf, const char *url,
1490 const char *hex,
1491 int only_two_digit_prefix)
1492 {
1493 end_url_with_slash(buf, url);
1494
1495 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1496 if (!only_two_digit_prefix)
1497 strbuf_addstr(buf, hex + 2);
1498 }
1499
1500 char *get_remote_object_url(const char *url, const char *hex,
1501 int only_two_digit_prefix)
1502 {
1503 struct strbuf buf = STRBUF_INIT;
1504 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1505 return strbuf_detach(&buf, NULL);
1506 }
1507
1508 static int handle_curl_result(struct slot_results *results)
1509 {
1510 /*
1511 * If we see a failing http code with CURLE_OK, we have turned off
1512 * FAILONERROR (to keep the server's custom error response), and should
1513 * translate the code into failure here.
1514 *
1515 * Likewise, if we see a redirect (30x code), that means we turned off
1516 * redirect-following, and we should treat the result as an error.
1517 */
1518 if (results->curl_result == CURLE_OK &&
1519 results->http_code >= 300) {
1520 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1521 /*
1522 * Normally curl will already have put the "reason phrase"
1523 * from the server into curl_errorstr; unfortunately without
1524 * FAILONERROR it is lost, so we can give only the numeric
1525 * status code.
1526 */
1527 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1528 "The requested URL returned error: %ld",
1529 results->http_code);
1530 }
1531
1532 if (results->curl_result == CURLE_OK) {
1533 credential_approve(&http_auth);
1534 if (proxy_auth.password)
1535 credential_approve(&proxy_auth);
1536 return HTTP_OK;
1537 } else if (missing_target(results))
1538 return HTTP_MISSING_TARGET;
1539 else if (results->http_code == 401) {
1540 if (http_auth.username && http_auth.password) {
1541 credential_reject(&http_auth);
1542 return HTTP_NOAUTH;
1543 } else {
1544 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1545 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1546 if (results->auth_avail) {
1547 http_auth_methods &= results->auth_avail;
1548 http_auth_methods_restricted = 1;
1549 }
1550 #endif
1551 return HTTP_REAUTH;
1552 }
1553 } else {
1554 if (results->http_connectcode == 407)
1555 credential_reject(&proxy_auth);
1556 #if LIBCURL_VERSION_NUM >= 0x070c00
1557 if (!curl_errorstr[0])
1558 strlcpy(curl_errorstr,
1559 curl_easy_strerror(results->curl_result),
1560 sizeof(curl_errorstr));
1561 #endif
1562 return HTTP_ERROR;
1563 }
1564 }
1565
1566 int run_one_slot(struct active_request_slot *slot,
1567 struct slot_results *results)
1568 {
1569 slot->results = results;
1570 if (!start_active_slot(slot)) {
1571 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1572 "failed to start HTTP request");
1573 return HTTP_START_FAILED;
1574 }
1575
1576 run_active_slot(slot);
1577 return handle_curl_result(results);
1578 }
1579
1580 struct curl_slist *http_copy_default_headers(void)
1581 {
1582 struct curl_slist *headers = NULL, *h;
1583
1584 for (h = extra_http_headers; h; h = h->next)
1585 headers = curl_slist_append(headers, h->data);
1586
1587 return headers;
1588 }
1589
1590 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1591 {
1592 char *ptr;
1593 CURLcode ret;
1594
1595 strbuf_reset(buf);
1596 ret = curl_easy_getinfo(curl, info, &ptr);
1597 if (!ret && ptr)
1598 strbuf_addstr(buf, ptr);
1599 return ret;
1600 }
1601
1602 /*
1603 * Check for and extract a content-type parameter. "raw"
1604 * should be positioned at the start of the potential
1605 * parameter, with any whitespace already removed.
1606 *
1607 * "name" is the name of the parameter. The value is appended
1608 * to "out".
1609 */
1610 static int extract_param(const char *raw, const char *name,
1611 struct strbuf *out)
1612 {
1613 size_t len = strlen(name);
1614
1615 if (strncasecmp(raw, name, len))
1616 return -1;
1617 raw += len;
1618
1619 if (*raw != '=')
1620 return -1;
1621 raw++;
1622
1623 while (*raw && !isspace(*raw) && *raw != ';')
1624 strbuf_addch(out, *raw++);
1625 return 0;
1626 }
1627
1628 /*
1629 * Extract a normalized version of the content type, with any
1630 * spaces suppressed, all letters lowercased, and no trailing ";"
1631 * or parameters.
1632 *
1633 * Note that we will silently remove even invalid whitespace. For
1634 * example, "text / plain" is specifically forbidden by RFC 2616,
1635 * but "text/plain" is the only reasonable output, and this keeps
1636 * our code simple.
1637 *
1638 * If the "charset" argument is not NULL, store the value of any
1639 * charset parameter there.
1640 *
1641 * Example:
1642 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1643 * "text / plain" -> "text/plain"
1644 */
1645 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1646 struct strbuf *charset)
1647 {
1648 const char *p;
1649
1650 strbuf_reset(type);
1651 strbuf_grow(type, raw->len);
1652 for (p = raw->buf; *p; p++) {
1653 if (isspace(*p))
1654 continue;
1655 if (*p == ';') {
1656 p++;
1657 break;
1658 }
1659 strbuf_addch(type, tolower(*p));
1660 }
1661
1662 if (!charset)
1663 return;
1664
1665 strbuf_reset(charset);
1666 while (*p) {
1667 while (isspace(*p) || *p == ';')
1668 p++;
1669 if (!extract_param(p, "charset", charset))
1670 return;
1671 while (*p && !isspace(*p))
1672 p++;
1673 }
1674
1675 if (!charset->len && starts_with(type->buf, "text/"))
1676 strbuf_addstr(charset, "ISO-8859-1");
1677 }
1678
1679 static void write_accept_language(struct strbuf *buf)
1680 {
1681 /*
1682 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1683 * that, q-value will be smaller than 0.001, the minimum q-value the
1684 * HTTP specification allows. See
1685 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1686 */
1687 const int MAX_DECIMAL_PLACES = 3;
1688 const int MAX_LANGUAGE_TAGS = 1000;
1689 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1690 char **language_tags = NULL;
1691 int num_langs = 0;
1692 const char *s = get_preferred_languages();
1693 int i;
1694 struct strbuf tag = STRBUF_INIT;
1695
1696 /* Don't add Accept-Language header if no language is preferred. */
1697 if (!s)
1698 return;
1699
1700 /*
1701 * Split the colon-separated string of preferred languages into
1702 * language_tags array.
1703 */
1704 do {
1705 /* collect language tag */
1706 for (; *s && (isalnum(*s) || *s == '_'); s++)
1707 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1708
1709 /* skip .codeset, @modifier and any other unnecessary parts */
1710 while (*s && *s != ':')
1711 s++;
1712
1713 if (tag.len) {
1714 num_langs++;
1715 REALLOC_ARRAY(language_tags, num_langs);
1716 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1717 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1718 break;
1719 }
1720 } while (*s++);
1721
1722 /* write Accept-Language header into buf */
1723 if (num_langs) {
1724 int last_buf_len = 0;
1725 int max_q;
1726 int decimal_places;
1727 char q_format[32];
1728
1729 /* add '*' */
1730 REALLOC_ARRAY(language_tags, num_langs + 1);
1731 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1732
1733 /* compute decimal_places */
1734 for (max_q = 1, decimal_places = 0;
1735 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1736 decimal_places++, max_q *= 10)
1737 ;
1738
1739 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1740
1741 strbuf_addstr(buf, "Accept-Language: ");
1742
1743 for (i = 0; i < num_langs; i++) {
1744 if (i > 0)
1745 strbuf_addstr(buf, ", ");
1746
1747 strbuf_addstr(buf, language_tags[i]);
1748
1749 if (i > 0)
1750 strbuf_addf(buf, q_format, max_q - i);
1751
1752 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1753 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1754 break;
1755 }
1756
1757 last_buf_len = buf->len;
1758 }
1759 }
1760
1761 /* free language tags -- last one is a static '*' */
1762 for (i = 0; i < num_langs - 1; i++)
1763 free(language_tags[i]);
1764 free(language_tags);
1765 }
1766
1767 /*
1768 * Get an Accept-Language header which indicates user's preferred languages.
1769 *
1770 * Examples:
1771 * LANGUAGE= -> ""
1772 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1773 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1774 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1775 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1776 * LANGUAGE= LANG=C -> ""
1777 */
1778 static const char *get_accept_language(void)
1779 {
1780 if (!cached_accept_language) {
1781 struct strbuf buf = STRBUF_INIT;
1782 write_accept_language(&buf);
1783 if (buf.len > 0)
1784 cached_accept_language = strbuf_detach(&buf, NULL);
1785 }
1786
1787 return cached_accept_language;
1788 }
1789
1790 static void http_opt_request_remainder(CURL *curl, off_t pos)
1791 {
1792 char buf[128];
1793 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1794 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1795 }
1796
1797 /* http_request() targets */
1798 #define HTTP_REQUEST_STRBUF 0
1799 #define HTTP_REQUEST_FILE 1
1800
1801 static int http_request(const char *url,
1802 void *result, int target,
1803 const struct http_get_options *options)
1804 {
1805 struct active_request_slot *slot;
1806 struct slot_results results;
1807 struct curl_slist *headers = http_copy_default_headers();
1808 struct strbuf buf = STRBUF_INIT;
1809 const char *accept_language;
1810 int ret;
1811
1812 slot = get_active_slot();
1813 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1814
1815 if (result == NULL) {
1816 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1817 } else {
1818 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1819 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1820
1821 if (target == HTTP_REQUEST_FILE) {
1822 off_t posn = ftello(result);
1823 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1824 fwrite);
1825 if (posn > 0)
1826 http_opt_request_remainder(slot->curl, posn);
1827 } else
1828 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1829 fwrite_buffer);
1830 }
1831
1832 accept_language = get_accept_language();
1833
1834 if (accept_language)
1835 headers = curl_slist_append(headers, accept_language);
1836
1837 strbuf_addstr(&buf, "Pragma:");
1838 if (options && options->no_cache)
1839 strbuf_addstr(&buf, " no-cache");
1840 if (options && options->keep_error)
1841 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1842 if (options && options->initial_request &&
1843 http_follow_config == HTTP_FOLLOW_INITIAL)
1844 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1845
1846 headers = curl_slist_append(headers, buf.buf);
1847
1848 /* Add additional headers here */
1849 if (options && options->extra_headers) {
1850 const struct string_list_item *item;
1851 for_each_string_list_item(item, options->extra_headers) {
1852 headers = curl_slist_append(headers, item->string);
1853 }
1854 }
1855
1856 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1857 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1858 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1859
1860 ret = run_one_slot(slot, &results);
1861
1862 if (options && options->content_type) {
1863 struct strbuf raw = STRBUF_INIT;
1864 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1865 extract_content_type(&raw, options->content_type,
1866 options->charset);
1867 strbuf_release(&raw);
1868 }
1869
1870 if (options && options->effective_url)
1871 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1872 options->effective_url);
1873
1874 curl_slist_free_all(headers);
1875 strbuf_release(&buf);
1876
1877 return ret;
1878 }
1879
1880 /*
1881 * Update the "base" url to a more appropriate value, as deduced by
1882 * redirects seen when requesting a URL starting with "url".
1883 *
1884 * The "asked" parameter is a URL that we asked curl to access, and must begin
1885 * with "base".
1886 *
1887 * The "got" parameter is the URL that curl reported to us as where we ended
1888 * up.
1889 *
1890 * Returns 1 if we updated the base url, 0 otherwise.
1891 *
1892 * Our basic strategy is to compare "base" and "asked" to find the bits
1893 * specific to our request. We then strip those bits off of "got" to yield the
1894 * new base. So for example, if our base is "http://example.com/foo.git",
1895 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1896 * with "https://other.example.com/foo.git/info/refs". We would want the
1897 * new URL to become "https://other.example.com/foo.git".
1898 *
1899 * Note that this assumes a sane redirect scheme. It's entirely possible
1900 * in the example above to end up at a URL that does not even end in
1901 * "info/refs". In such a case we die. There's not much we can do, such a
1902 * scheme is unlikely to represent a real git repository, and failing to
1903 * rewrite the base opens options for malicious redirects to do funny things.
1904 */
1905 static int update_url_from_redirect(struct strbuf *base,
1906 const char *asked,
1907 const struct strbuf *got)
1908 {
1909 const char *tail;
1910 size_t new_len;
1911
1912 if (!strcmp(asked, got->buf))
1913 return 0;
1914
1915 if (!skip_prefix(asked, base->buf, &tail))
1916 BUG("update_url_from_redirect: %s is not a superset of %s",
1917 asked, base->buf);
1918
1919 new_len = got->len;
1920 if (!strip_suffix_mem(got->buf, &new_len, tail))
1921 die(_("unable to update url base from redirection:\n"
1922 " asked for: %s\n"
1923 " redirect: %s"),
1924 asked, got->buf);
1925
1926 strbuf_reset(base);
1927 strbuf_add(base, got->buf, new_len);
1928
1929 return 1;
1930 }
1931
1932 static int http_request_reauth(const char *url,
1933 void *result, int target,
1934 struct http_get_options *options)
1935 {
1936 int ret = http_request(url, result, target, options);
1937
1938 if (ret != HTTP_OK && ret != HTTP_REAUTH)
1939 return ret;
1940
1941 if (options && options->effective_url && options->base_url) {
1942 if (update_url_from_redirect(options->base_url,
1943 url, options->effective_url)) {
1944 credential_from_url(&http_auth, options->base_url->buf);
1945 url = options->effective_url->buf;
1946 }
1947 }
1948
1949 if (ret != HTTP_REAUTH)
1950 return ret;
1951
1952 /*
1953 * If we are using KEEP_ERROR, the previous request may have
1954 * put cruft into our output stream; we should clear it out before
1955 * making our next request. We only know how to do this for
1956 * the strbuf case, but that is enough to satisfy current callers.
1957 */
1958 if (options && options->keep_error) {
1959 switch (target) {
1960 case HTTP_REQUEST_STRBUF:
1961 strbuf_reset(result);
1962 break;
1963 default:
1964 BUG("HTTP_KEEP_ERROR is only supported with strbufs");
1965 }
1966 }
1967
1968 credential_fill(&http_auth);
1969
1970 return http_request(url, result, target, options);
1971 }
1972
1973 int http_get_strbuf(const char *url,
1974 struct strbuf *result,
1975 struct http_get_options *options)
1976 {
1977 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1978 }
1979
1980 /*
1981 * Downloads a URL and stores the result in the given file.
1982 *
1983 * If a previous interrupted download is detected (i.e. a previous temporary
1984 * file is still around) the download is resumed.
1985 */
1986 static int http_get_file(const char *url, const char *filename,
1987 struct http_get_options *options)
1988 {
1989 int ret;
1990 struct strbuf tmpfile = STRBUF_INIT;
1991 FILE *result;
1992
1993 strbuf_addf(&tmpfile, "%s.temp", filename);
1994 result = fopen(tmpfile.buf, "a");
1995 if (!result) {
1996 error("Unable to open local file %s", tmpfile.buf);
1997 ret = HTTP_ERROR;
1998 goto cleanup;
1999 }
2000
2001 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
2002 fclose(result);
2003
2004 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
2005 ret = HTTP_ERROR;
2006 cleanup:
2007 strbuf_release(&tmpfile);
2008 return ret;
2009 }
2010
2011 int http_fetch_ref(const char *base, struct ref *ref)
2012 {
2013 struct http_get_options options = {0};
2014 char *url;
2015 struct strbuf buffer = STRBUF_INIT;
2016 int ret = -1;
2017
2018 options.no_cache = 1;
2019
2020 url = quote_ref_url(base, ref->name);
2021 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
2022 strbuf_rtrim(&buffer);
2023 if (buffer.len == 40)
2024 ret = get_oid_hex(buffer.buf, &ref->old_oid);
2025 else if (starts_with(buffer.buf, "ref: ")) {
2026 ref->symref = xstrdup(buffer.buf + 5);
2027 ret = 0;
2028 }
2029 }
2030
2031 strbuf_release(&buffer);
2032 free(url);
2033 return ret;
2034 }
2035
2036 /* Helpers for fetching packs */
2037 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
2038 {
2039 char *url, *tmp;
2040 struct strbuf buf = STRBUF_INIT;
2041
2042 if (http_is_verbose)
2043 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
2044
2045 end_url_with_slash(&buf, base_url);
2046 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
2047 url = strbuf_detach(&buf, NULL);
2048
2049 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
2050 tmp = strbuf_detach(&buf, NULL);
2051
2052 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
2053 error("Unable to get pack index %s", url);
2054 FREE_AND_NULL(tmp);
2055 }
2056
2057 free(url);
2058 return tmp;
2059 }
2060
2061 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
2062 unsigned char *sha1, const char *base_url)
2063 {
2064 struct packed_git *new_pack;
2065 char *tmp_idx = NULL;
2066 int ret;
2067
2068 if (has_pack_index(sha1)) {
2069 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
2070 if (!new_pack)
2071 return -1; /* parse_pack_index() already issued error message */
2072 goto add_pack;
2073 }
2074
2075 tmp_idx = fetch_pack_index(sha1, base_url);
2076 if (!tmp_idx)
2077 return -1;
2078
2079 new_pack = parse_pack_index(sha1, tmp_idx);
2080 if (!new_pack) {
2081 unlink(tmp_idx);
2082 free(tmp_idx);
2083
2084 return -1; /* parse_pack_index() already issued error message */
2085 }
2086
2087 ret = verify_pack_index(new_pack);
2088 if (!ret) {
2089 close_pack_index(new_pack);
2090 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
2091 }
2092 free(tmp_idx);
2093 if (ret)
2094 return -1;
2095
2096 add_pack:
2097 new_pack->next = *packs_head;
2098 *packs_head = new_pack;
2099 return 0;
2100 }
2101
2102 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
2103 {
2104 struct http_get_options options = {0};
2105 int ret = 0, i = 0;
2106 char *url, *data;
2107 struct strbuf buf = STRBUF_INIT;
2108 unsigned char hash[GIT_MAX_RAWSZ];
2109 const unsigned hexsz = the_hash_algo->hexsz;
2110
2111 end_url_with_slash(&buf, base_url);
2112 strbuf_addstr(&buf, "objects/info/packs");
2113 url = strbuf_detach(&buf, NULL);
2114
2115 options.no_cache = 1;
2116 ret = http_get_strbuf(url, &buf, &options);
2117 if (ret != HTTP_OK)
2118 goto cleanup;
2119
2120 data = buf.buf;
2121 while (i < buf.len) {
2122 switch (data[i]) {
2123 case 'P':
2124 i++;
2125 if (i + hexsz + 12 <= buf.len &&
2126 starts_with(data + i, " pack-") &&
2127 starts_with(data + i + hexsz + 6, ".pack\n")) {
2128 get_sha1_hex(data + i + 6, hash);
2129 fetch_and_setup_pack_index(packs_head, hash,
2130 base_url);
2131 i += hexsz + 11;
2132 break;
2133 }
2134 default:
2135 while (i < buf.len && data[i] != '\n')
2136 i++;
2137 }
2138 i++;
2139 }
2140
2141 cleanup:
2142 free(url);
2143 return ret;
2144 }
2145
2146 void release_http_pack_request(struct http_pack_request *preq)
2147 {
2148 if (preq->packfile != NULL) {
2149 fclose(preq->packfile);
2150 preq->packfile = NULL;
2151 }
2152 preq->slot = NULL;
2153 strbuf_release(&preq->tmpfile);
2154 free(preq->url);
2155 free(preq);
2156 }
2157
2158 int finish_http_pack_request(struct http_pack_request *preq)
2159 {
2160 struct packed_git **lst;
2161 struct packed_git *p = preq->target;
2162 char *tmp_idx;
2163 size_t len;
2164 struct child_process ip = CHILD_PROCESS_INIT;
2165
2166 close_pack_index(p);
2167
2168 fclose(preq->packfile);
2169 preq->packfile = NULL;
2170
2171 lst = preq->lst;
2172 while (*lst != p)
2173 lst = &((*lst)->next);
2174 *lst = (*lst)->next;
2175
2176 if (!strip_suffix(preq->tmpfile.buf, ".pack.temp", &len))
2177 BUG("pack tmpfile does not end in .pack.temp?");
2178 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile.buf);
2179
2180 argv_array_push(&ip.args, "index-pack");
2181 argv_array_pushl(&ip.args, "-o", tmp_idx, NULL);
2182 argv_array_push(&ip.args, preq->tmpfile.buf);
2183 ip.git_cmd = 1;
2184 ip.no_stdin = 1;
2185 ip.no_stdout = 1;
2186
2187 if (run_command(&ip)) {
2188 unlink(preq->tmpfile.buf);
2189 unlink(tmp_idx);
2190 free(tmp_idx);
2191 return -1;
2192 }
2193
2194 unlink(sha1_pack_index_name(p->sha1));
2195
2196 if (finalize_object_file(preq->tmpfile.buf, sha1_pack_name(p->sha1))
2197 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
2198 free(tmp_idx);
2199 return -1;
2200 }
2201
2202 install_packed_git(the_repository, p);
2203 free(tmp_idx);
2204 return 0;
2205 }
2206
2207 struct http_pack_request *new_http_pack_request(
2208 struct packed_git *target, const char *base_url)
2209 {
2210 off_t prev_posn = 0;
2211 struct strbuf buf = STRBUF_INIT;
2212 struct http_pack_request *preq;
2213
2214 preq = xcalloc(1, sizeof(*preq));
2215 strbuf_init(&preq->tmpfile, 0);
2216 preq->target = target;
2217
2218 end_url_with_slash(&buf, base_url);
2219 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2220 sha1_to_hex(target->sha1));
2221 preq->url = strbuf_detach(&buf, NULL);
2222
2223 strbuf_addf(&preq->tmpfile, "%s.temp", sha1_pack_name(target->sha1));
2224 preq->packfile = fopen(preq->tmpfile.buf, "a");
2225 if (!preq->packfile) {
2226 error("Unable to open local file %s for pack",
2227 preq->tmpfile.buf);
2228 goto abort;
2229 }
2230
2231 preq->slot = get_active_slot();
2232 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2233 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2234 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2235 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2236 no_pragma_header);
2237
2238 /*
2239 * If there is data present from a previous transfer attempt,
2240 * resume where it left off
2241 */
2242 prev_posn = ftello(preq->packfile);
2243 if (prev_posn>0) {
2244 if (http_is_verbose)
2245 fprintf(stderr,
2246 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2247 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
2248 http_opt_request_remainder(preq->slot->curl, prev_posn);
2249 }
2250
2251 return preq;
2252
2253 abort:
2254 strbuf_release(&preq->tmpfile);
2255 free(preq->url);
2256 free(preq);
2257 return NULL;
2258 }
2259
2260 /* Helpers for fetching objects (loose) */
2261 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2262 void *data)
2263 {
2264 unsigned char expn[4096];
2265 size_t size = eltsize * nmemb;
2266 int posn = 0;
2267 struct http_object_request *freq = data;
2268 struct active_request_slot *slot = freq->slot;
2269
2270 if (slot) {
2271 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2272 &slot->http_code);
2273 if (c != CURLE_OK)
2274 BUG("curl_easy_getinfo for HTTP code failed: %s",
2275 curl_easy_strerror(c));
2276 if (slot->http_code >= 300)
2277 return size;
2278 }
2279
2280 do {
2281 ssize_t retval = xwrite(freq->localfile,
2282 (char *) ptr + posn, size - posn);
2283 if (retval < 0)
2284 return posn;
2285 posn += retval;
2286 } while (posn < size);
2287
2288 freq->stream.avail_in = size;
2289 freq->stream.next_in = (void *)ptr;
2290 do {
2291 freq->stream.next_out = expn;
2292 freq->stream.avail_out = sizeof(expn);
2293 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2294 git_SHA1_Update(&freq->c, expn,
2295 sizeof(expn) - freq->stream.avail_out);
2296 } while (freq->stream.avail_in && freq->zret == Z_OK);
2297 return size;
2298 }
2299
2300 struct http_object_request *new_http_object_request(const char *base_url,
2301 unsigned char *sha1)
2302 {
2303 char *hex = sha1_to_hex(sha1);
2304 struct strbuf filename = STRBUF_INIT;
2305 struct strbuf prevfile = STRBUF_INIT;
2306 int prevlocal;
2307 char prev_buf[PREV_BUF_SIZE];
2308 ssize_t prev_read = 0;
2309 off_t prev_posn = 0;
2310 struct http_object_request *freq;
2311
2312 freq = xcalloc(1, sizeof(*freq));
2313 strbuf_init(&freq->tmpfile, 0);
2314 hashcpy(freq->sha1, sha1);
2315 freq->localfile = -1;
2316
2317 sha1_file_name(the_repository, &filename, sha1);
2318 strbuf_addf(&freq->tmpfile, "%s.temp", filename.buf);
2319
2320 strbuf_addf(&prevfile, "%s.prev", filename.buf);
2321 unlink_or_warn(prevfile.buf);
2322 rename(freq->tmpfile.buf, prevfile.buf);
2323 unlink_or_warn(freq->tmpfile.buf);
2324 strbuf_release(&filename);
2325
2326 if (freq->localfile != -1)
2327 error("fd leakage in start: %d", freq->localfile);
2328 freq->localfile = open(freq->tmpfile.buf,
2329 O_WRONLY | O_CREAT | O_EXCL, 0666);
2330 /*
2331 * This could have failed due to the "lazy directory creation";
2332 * try to mkdir the last path component.
2333 */
2334 if (freq->localfile < 0 && errno == ENOENT) {
2335 char *dir = strrchr(freq->tmpfile.buf, '/');
2336 if (dir) {
2337 *dir = 0;
2338 mkdir(freq->tmpfile.buf, 0777);
2339 *dir = '/';
2340 }
2341 freq->localfile = open(freq->tmpfile.buf,
2342 O_WRONLY | O_CREAT | O_EXCL, 0666);
2343 }
2344
2345 if (freq->localfile < 0) {
2346 error_errno("Couldn't create temporary file %s",
2347 freq->tmpfile.buf);
2348 goto abort;
2349 }
2350
2351 git_inflate_init(&freq->stream);
2352
2353 git_SHA1_Init(&freq->c);
2354
2355 freq->url = get_remote_object_url(base_url, hex, 0);
2356
2357 /*
2358 * If a previous temp file is present, process what was already
2359 * fetched.
2360 */
2361 prevlocal = open(prevfile.buf, O_RDONLY);
2362 if (prevlocal != -1) {
2363 do {
2364 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2365 if (prev_read>0) {
2366 if (fwrite_sha1_file(prev_buf,
2367 1,
2368 prev_read,
2369 freq) == prev_read) {
2370 prev_posn += prev_read;
2371 } else {
2372 prev_read = -1;
2373 }
2374 }
2375 } while (prev_read > 0);
2376 close(prevlocal);
2377 }
2378 unlink_or_warn(prevfile.buf);
2379 strbuf_release(&prevfile);
2380
2381 /*
2382 * Reset inflate/SHA1 if there was an error reading the previous temp
2383 * file; also rewind to the beginning of the local file.
2384 */
2385 if (prev_read == -1) {
2386 memset(&freq->stream, 0, sizeof(freq->stream));
2387 git_inflate_init(&freq->stream);
2388 git_SHA1_Init(&freq->c);
2389 if (prev_posn>0) {
2390 prev_posn = 0;
2391 lseek(freq->localfile, 0, SEEK_SET);
2392 if (ftruncate(freq->localfile, 0) < 0) {
2393 error_errno("Couldn't truncate temporary file %s",
2394 freq->tmpfile.buf);
2395 goto abort;
2396 }
2397 }
2398 }
2399
2400 freq->slot = get_active_slot();
2401
2402 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2403 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2404 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2405 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2406 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2407 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2408
2409 /*
2410 * If we have successfully processed data from a previous fetch
2411 * attempt, only fetch the data we don't already have.
2412 */
2413 if (prev_posn>0) {
2414 if (http_is_verbose)
2415 fprintf(stderr,
2416 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2417 hex, (uintmax_t)prev_posn);
2418 http_opt_request_remainder(freq->slot->curl, prev_posn);
2419 }
2420
2421 return freq;
2422
2423 abort:
2424 strbuf_release(&prevfile);
2425 free(freq->url);
2426 free(freq);
2427 return NULL;
2428 }
2429
2430 void process_http_object_request(struct http_object_request *freq)
2431 {
2432 if (freq->slot == NULL)
2433 return;
2434 freq->curl_result = freq->slot->curl_result;
2435 freq->http_code = freq->slot->http_code;
2436 freq->slot = NULL;
2437 }
2438
2439 int finish_http_object_request(struct http_object_request *freq)
2440 {
2441 struct stat st;
2442 struct strbuf filename = STRBUF_INIT;
2443
2444 close(freq->localfile);
2445 freq->localfile = -1;
2446
2447 process_http_object_request(freq);
2448
2449 if (freq->http_code == 416) {
2450 warning("requested range invalid; we may already have all the data.");
2451 } else if (freq->curl_result != CURLE_OK) {
2452 if (stat(freq->tmpfile.buf, &st) == 0)
2453 if (st.st_size == 0)
2454 unlink_or_warn(freq->tmpfile.buf);
2455 return -1;
2456 }
2457
2458 git_inflate_end(&freq->stream);
2459 git_SHA1_Final(freq->real_sha1, &freq->c);
2460 if (freq->zret != Z_STREAM_END) {
2461 unlink_or_warn(freq->tmpfile.buf);
2462 return -1;
2463 }
2464 if (!hasheq(freq->sha1, freq->real_sha1)) {
2465 unlink_or_warn(freq->tmpfile.buf);
2466 return -1;
2467 }
2468 sha1_file_name(the_repository, &filename, freq->sha1);
2469 freq->rename = finalize_object_file(freq->tmpfile.buf, filename.buf);
2470 strbuf_release(&filename);
2471
2472 return freq->rename;
2473 }
2474
2475 void abort_http_object_request(struct http_object_request *freq)
2476 {
2477 unlink_or_warn(freq->tmpfile.buf);
2478
2479 release_http_object_request(freq);
2480 }
2481
2482 void release_http_object_request(struct http_object_request *freq)
2483 {
2484 if (freq->localfile != -1) {
2485 close(freq->localfile);
2486 freq->localfile = -1;
2487 }
2488 FREE_AND_NULL(freq->url);
2489 if (freq->slot != NULL) {
2490 freq->slot->callback_func = NULL;
2491 freq->slot->callback_data = NULL;
2492 release_active_slot(freq->slot);
2493 freq->slot = NULL;
2494 }
2495 strbuf_release(&freq->tmpfile);
2496 }
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