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config.txt: move tag.* to a separate file
[git.git] / http.c
blob28009ca73ac859160ea8aa34ac8b3ace8692e1e2
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 applied to curl SSL options because\n"
838 "your curl version is too old (< 7.44.0)");
839 #endif
840 }
841
842 if (http_proactive_auth)
843 init_curl_http_auth(result);
844
845 if (getenv("GIT_SSL_VERSION"))
846 ssl_version = getenv("GIT_SSL_VERSION");
847 if (ssl_version && *ssl_version) {
848 int i;
849 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
850 if (!strcmp(ssl_version, sslversions[i].name)) {
851 curl_easy_setopt(result, CURLOPT_SSLVERSION,
852 sslversions[i].ssl_version);
853 break;
854 }
855 }
856 if (i == ARRAY_SIZE(sslversions))
857 warning("unsupported ssl version %s: using default",
858 ssl_version);
859 }
860
861 if (getenv("GIT_SSL_CIPHER_LIST"))
862 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
863 if (ssl_cipherlist != NULL && *ssl_cipherlist)
864 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
865 ssl_cipherlist);
866
867 if (ssl_cert != NULL)
868 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
869 if (has_cert_password())
870 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
871 #if LIBCURL_VERSION_NUM >= 0x070903
872 if (ssl_key != NULL)
873 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
874 #endif
875 #if LIBCURL_VERSION_NUM >= 0x070908
876 if (ssl_capath != NULL)
877 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
878 #endif
879 #if LIBCURL_VERSION_NUM >= 0x072c00
880 if (ssl_pinnedkey != NULL)
881 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
882 #endif
883 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
884 !http_schannel_use_ssl_cainfo) {
885 curl_easy_setopt(result, CURLOPT_CAINFO, NULL);
886 #if LIBCURL_VERSION_NUM >= 0x073400
887 curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, NULL);
888 #endif
889 } else if (ssl_cainfo != NULL)
890 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
891
892 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
893 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
894 curl_low_speed_limit);
895 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
896 curl_low_speed_time);
897 }
898
899 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
900 #if LIBCURL_VERSION_NUM >= 0x071301
901 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
902 #elif LIBCURL_VERSION_NUM >= 0x071101
903 curl_easy_setopt(result, CURLOPT_POST301, 1);
904 #endif
905 #ifdef CURLPROTO_HTTP
906 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
907 get_curl_allowed_protocols(0));
908 curl_easy_setopt(result, CURLOPT_PROTOCOLS,
909 get_curl_allowed_protocols(-1));
910 #else
911 warning("protocol restrictions not applied to curl redirects because\n"
912 "your curl version is too old (>= 7.19.4)");
913 #endif
914 if (getenv("GIT_CURL_VERBOSE"))
915 curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
916 setup_curl_trace(result);
917 if (getenv("GIT_TRACE_CURL_NO_DATA"))
918 trace_curl_data = 0;
919 if (getenv("GIT_REDACT_COOKIES")) {
920 string_list_split(&cookies_to_redact,
921 getenv("GIT_REDACT_COOKIES"), ',', -1);
922 string_list_sort(&cookies_to_redact);
923 }
924
925 curl_easy_setopt(result, CURLOPT_USERAGENT,
926 user_agent ? user_agent : git_user_agent());
927
928 if (curl_ftp_no_epsv)
929 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
930
931 #ifdef CURLOPT_USE_SSL
932 if (curl_ssl_try)
933 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
934 #endif
935
936 /*
937 * CURL also examines these variables as a fallback; but we need to query
938 * them here in order to decide whether to prompt for missing password (cf.
939 * init_curl_proxy_auth()).
940 *
941 * Unlike many other common environment variables, these are historically
942 * lowercase only. It appears that CURL did not know this and implemented
943 * only uppercase variants, which was later corrected to take both - with
944 * the exception of http_proxy, which is lowercase only also in CURL. As
945 * the lowercase versions are the historical quasi-standard, they take
946 * precedence here, as in CURL.
947 */
948 if (!curl_http_proxy) {
949 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
950 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
951 var_override(&curl_http_proxy, getenv("https_proxy"));
952 } else {
953 var_override(&curl_http_proxy, getenv("http_proxy"));
954 }
955 if (!curl_http_proxy) {
956 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
957 var_override(&curl_http_proxy, getenv("all_proxy"));
958 }
959 }
960
961 if (curl_http_proxy && curl_http_proxy[0] == '\0') {
962 /*
963 * Handle case with the empty http.proxy value here to keep
964 * common code clean.
965 * NB: empty option disables proxying at all.
966 */
967 curl_easy_setopt(result, CURLOPT_PROXY, "");
968 } else if (curl_http_proxy) {
969 #if LIBCURL_VERSION_NUM >= 0x071800
970 if (starts_with(curl_http_proxy, "socks5h"))
971 curl_easy_setopt(result,
972 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
973 else if (starts_with(curl_http_proxy, "socks5"))
974 curl_easy_setopt(result,
975 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
976 else if (starts_with(curl_http_proxy, "socks4a"))
977 curl_easy_setopt(result,
978 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
979 else if (starts_with(curl_http_proxy, "socks"))
980 curl_easy_setopt(result,
981 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
982 #endif
983 #if LIBCURL_VERSION_NUM >= 0x073400
984 else if (starts_with(curl_http_proxy, "https"))
985 curl_easy_setopt(result,
986 CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
987 #endif
988 if (strstr(curl_http_proxy, "://"))
989 credential_from_url(&proxy_auth, curl_http_proxy);
990 else {
991 struct strbuf url = STRBUF_INIT;
992 strbuf_addf(&url, "http://%s", curl_http_proxy);
993 credential_from_url(&proxy_auth, url.buf);
994 strbuf_release(&url);
995 }
996
997 if (!proxy_auth.host)
998 die("Invalid proxy URL '%s'", curl_http_proxy);
999
1000 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
1001 #if LIBCURL_VERSION_NUM >= 0x071304
1002 var_override(&curl_no_proxy, getenv("NO_PROXY"));
1003 var_override(&curl_no_proxy, getenv("no_proxy"));
1004 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
1005 #endif
1006 }
1007 init_curl_proxy_auth(result);
1008
1009 set_curl_keepalive(result);
1010
1011 return result;
1012 }
1013
1014 static void set_from_env(const char **var, const char *envname)
1015 {
1016 const char *val = getenv(envname);
1017 if (val)
1018 *var = val;
1019 }
1020
1021 void http_init(struct remote *remote, const char *url, int proactive_auth)
1022 {
1023 char *low_speed_limit;
1024 char *low_speed_time;
1025 char *normalized_url;
1026 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
1027
1028 config.section = "http";
1029 config.key = NULL;
1030 config.collect_fn = http_options;
1031 config.cascade_fn = git_default_config;
1032 config.cb = NULL;
1033
1034 http_is_verbose = 0;
1035 normalized_url = url_normalize(url, &config.url);
1036
1037 git_config(urlmatch_config_entry, &config);
1038 free(normalized_url);
1039
1040 #if LIBCURL_VERSION_NUM >= 0x073800
1041 if (http_ssl_backend) {
1042 const curl_ssl_backend **backends;
1043 struct strbuf buf = STRBUF_INIT;
1044 int i;
1045
1046 switch (curl_global_sslset(-1, http_ssl_backend, &backends)) {
1047 case CURLSSLSET_UNKNOWN_BACKEND:
1048 strbuf_addf(&buf, _("Unsupported SSL backend '%s'. "
1049 "Supported SSL backends:"),
1050 http_ssl_backend);
1051 for (i = 0; backends[i]; i++)
1052 strbuf_addf(&buf, "\n\t%s", backends[i]->name);
1053 die("%s", buf.buf);
1054 case CURLSSLSET_NO_BACKENDS:
1055 die(_("Could not set SSL backend to '%s': "
1056 "cURL was built without SSL backends"),
1057 http_ssl_backend);
1058 case CURLSSLSET_TOO_LATE:
1059 die(_("Could not set SSL backend to '%s': already set"),
1060 http_ssl_backend);
1061 case CURLSSLSET_OK:
1062 break; /* Okay! */
1063 }
1064 }
1065 #endif
1066
1067 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1068 die("curl_global_init failed");
1069
1070 http_proactive_auth = proactive_auth;
1071
1072 if (remote && remote->http_proxy)
1073 curl_http_proxy = xstrdup(remote->http_proxy);
1074
1075 if (remote)
1076 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
1077
1078 pragma_header = curl_slist_append(http_copy_default_headers(),
1079 "Pragma: no-cache");
1080 no_pragma_header = curl_slist_append(http_copy_default_headers(),
1081 "Pragma:");
1082
1083 #ifdef USE_CURL_MULTI
1084 {
1085 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1086 if (http_max_requests != NULL)
1087 max_requests = atoi(http_max_requests);
1088 }
1089
1090 curlm = curl_multi_init();
1091 if (!curlm)
1092 die("curl_multi_init failed");
1093 #endif
1094
1095 if (getenv("GIT_SSL_NO_VERIFY"))
1096 curl_ssl_verify = 0;
1097
1098 set_from_env(&ssl_cert, "GIT_SSL_CERT");
1099 #if LIBCURL_VERSION_NUM >= 0x070903
1100 set_from_env(&ssl_key, "GIT_SSL_KEY");
1101 #endif
1102 #if LIBCURL_VERSION_NUM >= 0x070908
1103 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
1104 #endif
1105 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
1106
1107 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
1108
1109 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1110 if (low_speed_limit != NULL)
1111 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1112 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1113 if (low_speed_time != NULL)
1114 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1115
1116 if (curl_ssl_verify == -1)
1117 curl_ssl_verify = 1;
1118
1119 curl_session_count = 0;
1120 #ifdef USE_CURL_MULTI
1121 if (max_requests < 1)
1122 max_requests = DEFAULT_MAX_REQUESTS;
1123 #endif
1124
1125 if (getenv("GIT_CURL_FTP_NO_EPSV"))
1126 curl_ftp_no_epsv = 1;
1127
1128 if (url) {
1129 credential_from_url(&http_auth, url);
1130 if (!ssl_cert_password_required &&
1131 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1132 starts_with(url, "https://"))
1133 ssl_cert_password_required = 1;
1134 }
1135
1136 #ifndef NO_CURL_EASY_DUPHANDLE
1137 curl_default = get_curl_handle();
1138 #endif
1139 }
1140
1141 void http_cleanup(void)
1142 {
1143 struct active_request_slot *slot = active_queue_head;
1144
1145 while (slot != NULL) {
1146 struct active_request_slot *next = slot->next;
1147 if (slot->curl != NULL) {
1148 xmulti_remove_handle(slot);
1149 curl_easy_cleanup(slot->curl);
1150 }
1151 free(slot);
1152 slot = next;
1153 }
1154 active_queue_head = NULL;
1155
1156 #ifndef NO_CURL_EASY_DUPHANDLE
1157 curl_easy_cleanup(curl_default);
1158 #endif
1159
1160 #ifdef USE_CURL_MULTI
1161 curl_multi_cleanup(curlm);
1162 #endif
1163 curl_global_cleanup();
1164
1165 curl_slist_free_all(extra_http_headers);
1166 extra_http_headers = NULL;
1167
1168 curl_slist_free_all(pragma_header);
1169 pragma_header = NULL;
1170
1171 curl_slist_free_all(no_pragma_header);
1172 no_pragma_header = NULL;
1173
1174 if (curl_http_proxy) {
1175 free((void *)curl_http_proxy);
1176 curl_http_proxy = NULL;
1177 }
1178
1179 if (proxy_auth.password) {
1180 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1181 FREE_AND_NULL(proxy_auth.password);
1182 }
1183
1184 free((void *)curl_proxyuserpwd);
1185 curl_proxyuserpwd = NULL;
1186
1187 free((void *)http_proxy_authmethod);
1188 http_proxy_authmethod = NULL;
1189
1190 if (cert_auth.password != NULL) {
1191 memset(cert_auth.password, 0, strlen(cert_auth.password));
1192 FREE_AND_NULL(cert_auth.password);
1193 }
1194 ssl_cert_password_required = 0;
1195
1196 FREE_AND_NULL(cached_accept_language);
1197 }
1198
1199 struct active_request_slot *get_active_slot(void)
1200 {
1201 struct active_request_slot *slot = active_queue_head;
1202 struct active_request_slot *newslot;
1203
1204 #ifdef USE_CURL_MULTI
1205 int num_transfers;
1206
1207 /* Wait for a slot to open up if the queue is full */
1208 while (active_requests >= max_requests) {
1209 curl_multi_perform(curlm, &num_transfers);
1210 if (num_transfers < active_requests)
1211 process_curl_messages();
1212 }
1213 #endif
1214
1215 while (slot != NULL && slot->in_use)
1216 slot = slot->next;
1217
1218 if (slot == NULL) {
1219 newslot = xmalloc(sizeof(*newslot));
1220 newslot->curl = NULL;
1221 newslot->in_use = 0;
1222 newslot->next = NULL;
1223
1224 slot = active_queue_head;
1225 if (slot == NULL) {
1226 active_queue_head = newslot;
1227 } else {
1228 while (slot->next != NULL)
1229 slot = slot->next;
1230 slot->next = newslot;
1231 }
1232 slot = newslot;
1233 }
1234
1235 if (slot->curl == NULL) {
1236 #ifdef NO_CURL_EASY_DUPHANDLE
1237 slot->curl = get_curl_handle();
1238 #else
1239 slot->curl = curl_easy_duphandle(curl_default);
1240 #endif
1241 curl_session_count++;
1242 }
1243
1244 active_requests++;
1245 slot->in_use = 1;
1246 slot->results = NULL;
1247 slot->finished = NULL;
1248 slot->callback_data = NULL;
1249 slot->callback_func = NULL;
1250 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1251 if (curl_save_cookies)
1252 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1253 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1254 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1255 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1256 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1257 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1258 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1259 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1260 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1261 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1262 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1263
1264 /*
1265 * Default following to off unless "ALWAYS" is configured; this gives
1266 * callers a sane starting point, and they can tweak for individual
1267 * HTTP_FOLLOW_* cases themselves.
1268 */
1269 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1270 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1271 else
1272 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1273
1274 #if LIBCURL_VERSION_NUM >= 0x070a08
1275 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1276 #endif
1277 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1278 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1279 #endif
1280 if (http_auth.password || curl_empty_auth_enabled())
1281 init_curl_http_auth(slot->curl);
1282
1283 return slot;
1284 }
1285
1286 int start_active_slot(struct active_request_slot *slot)
1287 {
1288 #ifdef USE_CURL_MULTI
1289 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1290 int num_transfers;
1291
1292 if (curlm_result != CURLM_OK &&
1293 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1294 warning("curl_multi_add_handle failed: %s",
1295 curl_multi_strerror(curlm_result));
1296 active_requests--;
1297 slot->in_use = 0;
1298 return 0;
1299 }
1300
1301 /*
1302 * We know there must be something to do, since we just added
1303 * something.
1304 */
1305 curl_multi_perform(curlm, &num_transfers);
1306 #endif
1307 return 1;
1308 }
1309
1310 #ifdef USE_CURL_MULTI
1311 struct fill_chain {
1312 void *data;
1313 int (*fill)(void *);
1314 struct fill_chain *next;
1315 };
1316
1317 static struct fill_chain *fill_cfg;
1318
1319 void add_fill_function(void *data, int (*fill)(void *))
1320 {
1321 struct fill_chain *new_fill = xmalloc(sizeof(*new_fill));
1322 struct fill_chain **linkp = &fill_cfg;
1323 new_fill->data = data;
1324 new_fill->fill = fill;
1325 new_fill->next = NULL;
1326 while (*linkp)
1327 linkp = &(*linkp)->next;
1328 *linkp = new_fill;
1329 }
1330
1331 void fill_active_slots(void)
1332 {
1333 struct active_request_slot *slot = active_queue_head;
1334
1335 while (active_requests < max_requests) {
1336 struct fill_chain *fill;
1337 for (fill = fill_cfg; fill; fill = fill->next)
1338 if (fill->fill(fill->data))
1339 break;
1340
1341 if (!fill)
1342 break;
1343 }
1344
1345 while (slot != NULL) {
1346 if (!slot->in_use && slot->curl != NULL
1347 && curl_session_count > min_curl_sessions) {
1348 curl_easy_cleanup(slot->curl);
1349 slot->curl = NULL;
1350 curl_session_count--;
1351 }
1352 slot = slot->next;
1353 }
1354 }
1355
1356 void step_active_slots(void)
1357 {
1358 int num_transfers;
1359 CURLMcode curlm_result;
1360
1361 do {
1362 curlm_result = curl_multi_perform(curlm, &num_transfers);
1363 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1364 if (num_transfers < active_requests) {
1365 process_curl_messages();
1366 fill_active_slots();
1367 }
1368 }
1369 #endif
1370
1371 void run_active_slot(struct active_request_slot *slot)
1372 {
1373 #ifdef USE_CURL_MULTI
1374 fd_set readfds;
1375 fd_set writefds;
1376 fd_set excfds;
1377 int max_fd;
1378 struct timeval select_timeout;
1379 int finished = 0;
1380
1381 slot->finished = &finished;
1382 while (!finished) {
1383 step_active_slots();
1384
1385 if (slot->in_use) {
1386 #if LIBCURL_VERSION_NUM >= 0x070f04
1387 long curl_timeout;
1388 curl_multi_timeout(curlm, &curl_timeout);
1389 if (curl_timeout == 0) {
1390 continue;
1391 } else if (curl_timeout == -1) {
1392 select_timeout.tv_sec = 0;
1393 select_timeout.tv_usec = 50000;
1394 } else {
1395 select_timeout.tv_sec = curl_timeout / 1000;
1396 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1397 }
1398 #else
1399 select_timeout.tv_sec = 0;
1400 select_timeout.tv_usec = 50000;
1401 #endif
1402
1403 max_fd = -1;
1404 FD_ZERO(&readfds);
1405 FD_ZERO(&writefds);
1406 FD_ZERO(&excfds);
1407 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1408
1409 /*
1410 * It can happen that curl_multi_timeout returns a pathologically
1411 * long timeout when curl_multi_fdset returns no file descriptors
1412 * to read. See commit message for more details.
1413 */
1414 if (max_fd < 0 &&
1415 (select_timeout.tv_sec > 0 ||
1416 select_timeout.tv_usec > 50000)) {
1417 select_timeout.tv_sec = 0;
1418 select_timeout.tv_usec = 50000;
1419 }
1420
1421 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1422 }
1423 }
1424 #else
1425 while (slot->in_use) {
1426 slot->curl_result = curl_easy_perform(slot->curl);
1427 finish_active_slot(slot);
1428 }
1429 #endif
1430 }
1431
1432 static void release_active_slot(struct active_request_slot *slot)
1433 {
1434 closedown_active_slot(slot);
1435 if (slot->curl) {
1436 xmulti_remove_handle(slot);
1437 if (curl_session_count > min_curl_sessions) {
1438 curl_easy_cleanup(slot->curl);
1439 slot->curl = NULL;
1440 curl_session_count--;
1441 }
1442 }
1443 #ifdef USE_CURL_MULTI
1444 fill_active_slots();
1445 #endif
1446 }
1447
1448 void finish_all_active_slots(void)
1449 {
1450 struct active_request_slot *slot = active_queue_head;
1451
1452 while (slot != NULL)
1453 if (slot->in_use) {
1454 run_active_slot(slot);
1455 slot = active_queue_head;
1456 } else {
1457 slot = slot->next;
1458 }
1459 }
1460
1461 /* Helpers for modifying and creating URLs */
1462 static inline int needs_quote(int ch)
1463 {
1464 if (((ch >= 'A') && (ch <= 'Z'))
1465 || ((ch >= 'a') && (ch <= 'z'))
1466 || ((ch >= '0') && (ch <= '9'))
1467 || (ch == '/')
1468 || (ch == '-')
1469 || (ch == '.'))
1470 return 0;
1471 return 1;
1472 }
1473
1474 static char *quote_ref_url(const char *base, const char *ref)
1475 {
1476 struct strbuf buf = STRBUF_INIT;
1477 const char *cp;
1478 int ch;
1479
1480 end_url_with_slash(&buf, base);
1481
1482 for (cp = ref; (ch = *cp) != 0; cp++)
1483 if (needs_quote(ch))
1484 strbuf_addf(&buf, "%%%02x", ch);
1485 else
1486 strbuf_addch(&buf, *cp);
1487
1488 return strbuf_detach(&buf, NULL);
1489 }
1490
1491 void append_remote_object_url(struct strbuf *buf, const char *url,
1492 const char *hex,
1493 int only_two_digit_prefix)
1494 {
1495 end_url_with_slash(buf, url);
1496
1497 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1498 if (!only_two_digit_prefix)
1499 strbuf_addstr(buf, hex + 2);
1500 }
1501
1502 char *get_remote_object_url(const char *url, const char *hex,
1503 int only_two_digit_prefix)
1504 {
1505 struct strbuf buf = STRBUF_INIT;
1506 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1507 return strbuf_detach(&buf, NULL);
1508 }
1509
1510 static int handle_curl_result(struct slot_results *results)
1511 {
1512 /*
1513 * If we see a failing http code with CURLE_OK, we have turned off
1514 * FAILONERROR (to keep the server's custom error response), and should
1515 * translate the code into failure here.
1516 *
1517 * Likewise, if we see a redirect (30x code), that means we turned off
1518 * redirect-following, and we should treat the result as an error.
1519 */
1520 if (results->curl_result == CURLE_OK &&
1521 results->http_code >= 300) {
1522 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1523 /*
1524 * Normally curl will already have put the "reason phrase"
1525 * from the server into curl_errorstr; unfortunately without
1526 * FAILONERROR it is lost, so we can give only the numeric
1527 * status code.
1528 */
1529 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1530 "The requested URL returned error: %ld",
1531 results->http_code);
1532 }
1533
1534 if (results->curl_result == CURLE_OK) {
1535 credential_approve(&http_auth);
1536 if (proxy_auth.password)
1537 credential_approve(&proxy_auth);
1538 return HTTP_OK;
1539 } else if (missing_target(results))
1540 return HTTP_MISSING_TARGET;
1541 else if (results->http_code == 401) {
1542 if (http_auth.username && http_auth.password) {
1543 credential_reject(&http_auth);
1544 return HTTP_NOAUTH;
1545 } else {
1546 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1547 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1548 if (results->auth_avail) {
1549 http_auth_methods &= results->auth_avail;
1550 http_auth_methods_restricted = 1;
1551 }
1552 #endif
1553 return HTTP_REAUTH;
1554 }
1555 } else {
1556 if (results->http_connectcode == 407)
1557 credential_reject(&proxy_auth);
1558 #if LIBCURL_VERSION_NUM >= 0x070c00
1559 if (!curl_errorstr[0])
1560 strlcpy(curl_errorstr,
1561 curl_easy_strerror(results->curl_result),
1562 sizeof(curl_errorstr));
1563 #endif
1564 return HTTP_ERROR;
1565 }
1566 }
1567
1568 int run_one_slot(struct active_request_slot *slot,
1569 struct slot_results *results)
1570 {
1571 slot->results = results;
1572 if (!start_active_slot(slot)) {
1573 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1574 "failed to start HTTP request");
1575 return HTTP_START_FAILED;
1576 }
1577
1578 run_active_slot(slot);
1579 return handle_curl_result(results);
1580 }
1581
1582 struct curl_slist *http_copy_default_headers(void)
1583 {
1584 struct curl_slist *headers = NULL, *h;
1585
1586 for (h = extra_http_headers; h; h = h->next)
1587 headers = curl_slist_append(headers, h->data);
1588
1589 return headers;
1590 }
1591
1592 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1593 {
1594 char *ptr;
1595 CURLcode ret;
1596
1597 strbuf_reset(buf);
1598 ret = curl_easy_getinfo(curl, info, &ptr);
1599 if (!ret && ptr)
1600 strbuf_addstr(buf, ptr);
1601 return ret;
1602 }
1603
1604 /*
1605 * Check for and extract a content-type parameter. "raw"
1606 * should be positioned at the start of the potential
1607 * parameter, with any whitespace already removed.
1608 *
1609 * "name" is the name of the parameter. The value is appended
1610 * to "out".
1611 */
1612 static int extract_param(const char *raw, const char *name,
1613 struct strbuf *out)
1614 {
1615 size_t len = strlen(name);
1616
1617 if (strncasecmp(raw, name, len))
1618 return -1;
1619 raw += len;
1620
1621 if (*raw != '=')
1622 return -1;
1623 raw++;
1624
1625 while (*raw && !isspace(*raw) && *raw != ';')
1626 strbuf_addch(out, *raw++);
1627 return 0;
1628 }
1629
1630 /*
1631 * Extract a normalized version of the content type, with any
1632 * spaces suppressed, all letters lowercased, and no trailing ";"
1633 * or parameters.
1634 *
1635 * Note that we will silently remove even invalid whitespace. For
1636 * example, "text / plain" is specifically forbidden by RFC 2616,
1637 * but "text/plain" is the only reasonable output, and this keeps
1638 * our code simple.
1639 *
1640 * If the "charset" argument is not NULL, store the value of any
1641 * charset parameter there.
1642 *
1643 * Example:
1644 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1645 * "text / plain" -> "text/plain"
1646 */
1647 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1648 struct strbuf *charset)
1649 {
1650 const char *p;
1651
1652 strbuf_reset(type);
1653 strbuf_grow(type, raw->len);
1654 for (p = raw->buf; *p; p++) {
1655 if (isspace(*p))
1656 continue;
1657 if (*p == ';') {
1658 p++;
1659 break;
1660 }
1661 strbuf_addch(type, tolower(*p));
1662 }
1663
1664 if (!charset)
1665 return;
1666
1667 strbuf_reset(charset);
1668 while (*p) {
1669 while (isspace(*p) || *p == ';')
1670 p++;
1671 if (!extract_param(p, "charset", charset))
1672 return;
1673 while (*p && !isspace(*p))
1674 p++;
1675 }
1676
1677 if (!charset->len && starts_with(type->buf, "text/"))
1678 strbuf_addstr(charset, "ISO-8859-1");
1679 }
1680
1681 static void write_accept_language(struct strbuf *buf)
1682 {
1683 /*
1684 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1685 * that, q-value will be smaller than 0.001, the minimum q-value the
1686 * HTTP specification allows. See
1687 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1688 */
1689 const int MAX_DECIMAL_PLACES = 3;
1690 const int MAX_LANGUAGE_TAGS = 1000;
1691 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1692 char **language_tags = NULL;
1693 int num_langs = 0;
1694 const char *s = get_preferred_languages();
1695 int i;
1696 struct strbuf tag = STRBUF_INIT;
1697
1698 /* Don't add Accept-Language header if no language is preferred. */
1699 if (!s)
1700 return;
1701
1702 /*
1703 * Split the colon-separated string of preferred languages into
1704 * language_tags array.
1705 */
1706 do {
1707 /* collect language tag */
1708 for (; *s && (isalnum(*s) || *s == '_'); s++)
1709 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1710
1711 /* skip .codeset, @modifier and any other unnecessary parts */
1712 while (*s && *s != ':')
1713 s++;
1714
1715 if (tag.len) {
1716 num_langs++;
1717 REALLOC_ARRAY(language_tags, num_langs);
1718 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1719 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1720 break;
1721 }
1722 } while (*s++);
1723
1724 /* write Accept-Language header into buf */
1725 if (num_langs) {
1726 int last_buf_len = 0;
1727 int max_q;
1728 int decimal_places;
1729 char q_format[32];
1730
1731 /* add '*' */
1732 REALLOC_ARRAY(language_tags, num_langs + 1);
1733 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1734
1735 /* compute decimal_places */
1736 for (max_q = 1, decimal_places = 0;
1737 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1738 decimal_places++, max_q *= 10)
1739 ;
1740
1741 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1742
1743 strbuf_addstr(buf, "Accept-Language: ");
1744
1745 for (i = 0; i < num_langs; i++) {
1746 if (i > 0)
1747 strbuf_addstr(buf, ", ");
1748
1749 strbuf_addstr(buf, language_tags[i]);
1750
1751 if (i > 0)
1752 strbuf_addf(buf, q_format, max_q - i);
1753
1754 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1755 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1756 break;
1757 }
1758
1759 last_buf_len = buf->len;
1760 }
1761 }
1762
1763 /* free language tags -- last one is a static '*' */
1764 for (i = 0; i < num_langs - 1; i++)
1765 free(language_tags[i]);
1766 free(language_tags);
1767 }
1768
1769 /*
1770 * Get an Accept-Language header which indicates user's preferred languages.
1771 *
1772 * Examples:
1773 * LANGUAGE= -> ""
1774 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1775 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1776 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1777 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1778 * LANGUAGE= LANG=C -> ""
1779 */
1780 static const char *get_accept_language(void)
1781 {
1782 if (!cached_accept_language) {
1783 struct strbuf buf = STRBUF_INIT;
1784 write_accept_language(&buf);
1785 if (buf.len > 0)
1786 cached_accept_language = strbuf_detach(&buf, NULL);
1787 }
1788
1789 return cached_accept_language;
1790 }
1791
1792 static void http_opt_request_remainder(CURL *curl, off_t pos)
1793 {
1794 char buf[128];
1795 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1796 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1797 }
1798
1799 /* http_request() targets */
1800 #define HTTP_REQUEST_STRBUF 0
1801 #define HTTP_REQUEST_FILE 1
1802
1803 static int http_request(const char *url,
1804 void *result, int target,
1805 const struct http_get_options *options)
1806 {
1807 struct active_request_slot *slot;
1808 struct slot_results results;
1809 struct curl_slist *headers = http_copy_default_headers();
1810 struct strbuf buf = STRBUF_INIT;
1811 const char *accept_language;
1812 int ret;
1813
1814 slot = get_active_slot();
1815 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1816
1817 if (result == NULL) {
1818 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1819 } else {
1820 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1821 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1822
1823 if (target == HTTP_REQUEST_FILE) {
1824 off_t posn = ftello(result);
1825 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1826 fwrite);
1827 if (posn > 0)
1828 http_opt_request_remainder(slot->curl, posn);
1829 } else
1830 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1831 fwrite_buffer);
1832 }
1833
1834 accept_language = get_accept_language();
1835
1836 if (accept_language)
1837 headers = curl_slist_append(headers, accept_language);
1838
1839 strbuf_addstr(&buf, "Pragma:");
1840 if (options && options->no_cache)
1841 strbuf_addstr(&buf, " no-cache");
1842 if (options && options->keep_error)
1843 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1844 if (options && options->initial_request &&
1845 http_follow_config == HTTP_FOLLOW_INITIAL)
1846 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1847
1848 headers = curl_slist_append(headers, buf.buf);
1849
1850 /* Add additional headers here */
1851 if (options && options->extra_headers) {
1852 const struct string_list_item *item;
1853 for_each_string_list_item(item, options->extra_headers) {
1854 headers = curl_slist_append(headers, item->string);
1855 }
1856 }
1857
1858 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1859 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1860 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1861
1862 ret = run_one_slot(slot, &results);
1863
1864 if (options && options->content_type) {
1865 struct strbuf raw = STRBUF_INIT;
1866 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1867 extract_content_type(&raw, options->content_type,
1868 options->charset);
1869 strbuf_release(&raw);
1870 }
1871
1872 if (options && options->effective_url)
1873 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1874 options->effective_url);
1875
1876 curl_slist_free_all(headers);
1877 strbuf_release(&buf);
1878
1879 return ret;
1880 }
1881
1882 /*
1883 * Update the "base" url to a more appropriate value, as deduced by
1884 * redirects seen when requesting a URL starting with "url".
1885 *
1886 * The "asked" parameter is a URL that we asked curl to access, and must begin
1887 * with "base".
1888 *
1889 * The "got" parameter is the URL that curl reported to us as where we ended
1890 * up.
1891 *
1892 * Returns 1 if we updated the base url, 0 otherwise.
1893 *
1894 * Our basic strategy is to compare "base" and "asked" to find the bits
1895 * specific to our request. We then strip those bits off of "got" to yield the
1896 * new base. So for example, if our base is "http://example.com/foo.git",
1897 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1898 * with "https://other.example.com/foo.git/info/refs". We would want the
1899 * new URL to become "https://other.example.com/foo.git".
1900 *
1901 * Note that this assumes a sane redirect scheme. It's entirely possible
1902 * in the example above to end up at a URL that does not even end in
1903 * "info/refs". In such a case we die. There's not much we can do, such a
1904 * scheme is unlikely to represent a real git repository, and failing to
1905 * rewrite the base opens options for malicious redirects to do funny things.
1906 */
1907 static int update_url_from_redirect(struct strbuf *base,
1908 const char *asked,
1909 const struct strbuf *got)
1910 {
1911 const char *tail;
1912 size_t new_len;
1913
1914 if (!strcmp(asked, got->buf))
1915 return 0;
1916
1917 if (!skip_prefix(asked, base->buf, &tail))
1918 BUG("update_url_from_redirect: %s is not a superset of %s",
1919 asked, base->buf);
1920
1921 new_len = got->len;
1922 if (!strip_suffix_mem(got->buf, &new_len, tail))
1923 die(_("unable to update url base from redirection:\n"
1924 " asked for: %s\n"
1925 " redirect: %s"),
1926 asked, got->buf);
1927
1928 strbuf_reset(base);
1929 strbuf_add(base, got->buf, new_len);
1930
1931 return 1;
1932 }
1933
1934 static int http_request_reauth(const char *url,
1935 void *result, int target,
1936 struct http_get_options *options)
1937 {
1938 int ret = http_request(url, result, target, options);
1939
1940 if (ret != HTTP_OK && ret != HTTP_REAUTH)
1941 return ret;
1942
1943 if (options && options->effective_url && options->base_url) {
1944 if (update_url_from_redirect(options->base_url,
1945 url, options->effective_url)) {
1946 credential_from_url(&http_auth, options->base_url->buf);
1947 url = options->effective_url->buf;
1948 }
1949 }
1950
1951 if (ret != HTTP_REAUTH)
1952 return ret;
1953
1954 /*
1955 * If we are using KEEP_ERROR, the previous request may have
1956 * put cruft into our output stream; we should clear it out before
1957 * making our next request. We only know how to do this for
1958 * the strbuf case, but that is enough to satisfy current callers.
1959 */
1960 if (options && options->keep_error) {
1961 switch (target) {
1962 case HTTP_REQUEST_STRBUF:
1963 strbuf_reset(result);
1964 break;
1965 default:
1966 BUG("HTTP_KEEP_ERROR is only supported with strbufs");
1967 }
1968 }
1969
1970 credential_fill(&http_auth);
1971
1972 return http_request(url, result, target, options);
1973 }
1974
1975 int http_get_strbuf(const char *url,
1976 struct strbuf *result,
1977 struct http_get_options *options)
1978 {
1979 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1980 }
1981
1982 /*
1983 * Downloads a URL and stores the result in the given file.
1984 *
1985 * If a previous interrupted download is detected (i.e. a previous temporary
1986 * file is still around) the download is resumed.
1987 */
1988 static int http_get_file(const char *url, const char *filename,
1989 struct http_get_options *options)
1990 {
1991 int ret;
1992 struct strbuf tmpfile = STRBUF_INIT;
1993 FILE *result;
1994
1995 strbuf_addf(&tmpfile, "%s.temp", filename);
1996 result = fopen(tmpfile.buf, "a");
1997 if (!result) {
1998 error("Unable to open local file %s", tmpfile.buf);
1999 ret = HTTP_ERROR;
2000 goto cleanup;
2001 }
2002
2003 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
2004 fclose(result);
2005
2006 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
2007 ret = HTTP_ERROR;
2008 cleanup:
2009 strbuf_release(&tmpfile);
2010 return ret;
2011 }
2012
2013 int http_fetch_ref(const char *base, struct ref *ref)
2014 {
2015 struct http_get_options options = {0};
2016 char *url;
2017 struct strbuf buffer = STRBUF_INIT;
2018 int ret = -1;
2019
2020 options.no_cache = 1;
2021
2022 url = quote_ref_url(base, ref->name);
2023 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
2024 strbuf_rtrim(&buffer);
2025 if (buffer.len == 40)
2026 ret = get_oid_hex(buffer.buf, &ref->old_oid);
2027 else if (starts_with(buffer.buf, "ref: ")) {
2028 ref->symref = xstrdup(buffer.buf + 5);
2029 ret = 0;
2030 }
2031 }
2032
2033 strbuf_release(&buffer);
2034 free(url);
2035 return ret;
2036 }
2037
2038 /* Helpers for fetching packs */
2039 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
2040 {
2041 char *url, *tmp;
2042 struct strbuf buf = STRBUF_INIT;
2043
2044 if (http_is_verbose)
2045 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
2046
2047 end_url_with_slash(&buf, base_url);
2048 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
2049 url = strbuf_detach(&buf, NULL);
2050
2051 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
2052 tmp = strbuf_detach(&buf, NULL);
2053
2054 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
2055 error("Unable to get pack index %s", url);
2056 FREE_AND_NULL(tmp);
2057 }
2058
2059 free(url);
2060 return tmp;
2061 }
2062
2063 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
2064 unsigned char *sha1, const char *base_url)
2065 {
2066 struct packed_git *new_pack;
2067 char *tmp_idx = NULL;
2068 int ret;
2069
2070 if (has_pack_index(sha1)) {
2071 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
2072 if (!new_pack)
2073 return -1; /* parse_pack_index() already issued error message */
2074 goto add_pack;
2075 }
2076
2077 tmp_idx = fetch_pack_index(sha1, base_url);
2078 if (!tmp_idx)
2079 return -1;
2080
2081 new_pack = parse_pack_index(sha1, tmp_idx);
2082 if (!new_pack) {
2083 unlink(tmp_idx);
2084 free(tmp_idx);
2085
2086 return -1; /* parse_pack_index() already issued error message */
2087 }
2088
2089 ret = verify_pack_index(new_pack);
2090 if (!ret) {
2091 close_pack_index(new_pack);
2092 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
2093 }
2094 free(tmp_idx);
2095 if (ret)
2096 return -1;
2097
2098 add_pack:
2099 new_pack->next = *packs_head;
2100 *packs_head = new_pack;
2101 return 0;
2102 }
2103
2104 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
2105 {
2106 struct http_get_options options = {0};
2107 int ret = 0, i = 0;
2108 char *url, *data;
2109 struct strbuf buf = STRBUF_INIT;
2110 unsigned char hash[GIT_MAX_RAWSZ];
2111 const unsigned hexsz = the_hash_algo->hexsz;
2112
2113 end_url_with_slash(&buf, base_url);
2114 strbuf_addstr(&buf, "objects/info/packs");
2115 url = strbuf_detach(&buf, NULL);
2116
2117 options.no_cache = 1;
2118 ret = http_get_strbuf(url, &buf, &options);
2119 if (ret != HTTP_OK)
2120 goto cleanup;
2121
2122 data = buf.buf;
2123 while (i < buf.len) {
2124 switch (data[i]) {
2125 case 'P':
2126 i++;
2127 if (i + hexsz + 12 <= buf.len &&
2128 starts_with(data + i, " pack-") &&
2129 starts_with(data + i + hexsz + 6, ".pack\n")) {
2130 get_sha1_hex(data + i + 6, hash);
2131 fetch_and_setup_pack_index(packs_head, hash,
2132 base_url);
2133 i += hexsz + 11;
2134 break;
2135 }
2136 default:
2137 while (i < buf.len && data[i] != '\n')
2138 i++;
2139 }
2140 i++;
2141 }
2142
2143 cleanup:
2144 free(url);
2145 return ret;
2146 }
2147
2148 void release_http_pack_request(struct http_pack_request *preq)
2149 {
2150 if (preq->packfile != NULL) {
2151 fclose(preq->packfile);
2152 preq->packfile = NULL;
2153 }
2154 preq->slot = NULL;
2155 strbuf_release(&preq->tmpfile);
2156 free(preq->url);
2157 free(preq);
2158 }
2159
2160 int finish_http_pack_request(struct http_pack_request *preq)
2161 {
2162 struct packed_git **lst;
2163 struct packed_git *p = preq->target;
2164 char *tmp_idx;
2165 size_t len;
2166 struct child_process ip = CHILD_PROCESS_INIT;
2167
2168 close_pack_index(p);
2169
2170 fclose(preq->packfile);
2171 preq->packfile = NULL;
2172
2173 lst = preq->lst;
2174 while (*lst != p)
2175 lst = &((*lst)->next);
2176 *lst = (*lst)->next;
2177
2178 if (!strip_suffix(preq->tmpfile.buf, ".pack.temp", &len))
2179 BUG("pack tmpfile does not end in .pack.temp?");
2180 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile.buf);
2181
2182 argv_array_push(&ip.args, "index-pack");
2183 argv_array_pushl(&ip.args, "-o", tmp_idx, NULL);
2184 argv_array_push(&ip.args, preq->tmpfile.buf);
2185 ip.git_cmd = 1;
2186 ip.no_stdin = 1;
2187 ip.no_stdout = 1;
2188
2189 if (run_command(&ip)) {
2190 unlink(preq->tmpfile.buf);
2191 unlink(tmp_idx);
2192 free(tmp_idx);
2193 return -1;
2194 }
2195
2196 unlink(sha1_pack_index_name(p->sha1));
2197
2198 if (finalize_object_file(preq->tmpfile.buf, sha1_pack_name(p->sha1))
2199 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
2200 free(tmp_idx);
2201 return -1;
2202 }
2203
2204 install_packed_git(the_repository, p);
2205 free(tmp_idx);
2206 return 0;
2207 }
2208
2209 struct http_pack_request *new_http_pack_request(
2210 struct packed_git *target, const char *base_url)
2211 {
2212 off_t prev_posn = 0;
2213 struct strbuf buf = STRBUF_INIT;
2214 struct http_pack_request *preq;
2215
2216 preq = xcalloc(1, sizeof(*preq));
2217 strbuf_init(&preq->tmpfile, 0);
2218 preq->target = target;
2219
2220 end_url_with_slash(&buf, base_url);
2221 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2222 sha1_to_hex(target->sha1));
2223 preq->url = strbuf_detach(&buf, NULL);
2224
2225 strbuf_addf(&preq->tmpfile, "%s.temp", sha1_pack_name(target->sha1));
2226 preq->packfile = fopen(preq->tmpfile.buf, "a");
2227 if (!preq->packfile) {
2228 error("Unable to open local file %s for pack",
2229 preq->tmpfile.buf);
2230 goto abort;
2231 }
2232
2233 preq->slot = get_active_slot();
2234 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2235 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2236 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2237 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2238 no_pragma_header);
2239
2240 /*
2241 * If there is data present from a previous transfer attempt,
2242 * resume where it left off
2243 */
2244 prev_posn = ftello(preq->packfile);
2245 if (prev_posn>0) {
2246 if (http_is_verbose)
2247 fprintf(stderr,
2248 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2249 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
2250 http_opt_request_remainder(preq->slot->curl, prev_posn);
2251 }
2252
2253 return preq;
2254
2255 abort:
2256 strbuf_release(&preq->tmpfile);
2257 free(preq->url);
2258 free(preq);
2259 return NULL;
2260 }
2261
2262 /* Helpers for fetching objects (loose) */
2263 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2264 void *data)
2265 {
2266 unsigned char expn[4096];
2267 size_t size = eltsize * nmemb;
2268 int posn = 0;
2269 struct http_object_request *freq = data;
2270 struct active_request_slot *slot = freq->slot;
2271
2272 if (slot) {
2273 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2274 &slot->http_code);
2275 if (c != CURLE_OK)
2276 BUG("curl_easy_getinfo for HTTP code failed: %s",
2277 curl_easy_strerror(c));
2278 if (slot->http_code >= 300)
2279 return size;
2280 }
2281
2282 do {
2283 ssize_t retval = xwrite(freq->localfile,
2284 (char *) ptr + posn, size - posn);
2285 if (retval < 0)
2286 return posn;
2287 posn += retval;
2288 } while (posn < size);
2289
2290 freq->stream.avail_in = size;
2291 freq->stream.next_in = (void *)ptr;
2292 do {
2293 freq->stream.next_out = expn;
2294 freq->stream.avail_out = sizeof(expn);
2295 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2296 git_SHA1_Update(&freq->c, expn,
2297 sizeof(expn) - freq->stream.avail_out);
2298 } while (freq->stream.avail_in && freq->zret == Z_OK);
2299 return size;
2300 }
2301
2302 struct http_object_request *new_http_object_request(const char *base_url,
2303 unsigned char *sha1)
2304 {
2305 char *hex = sha1_to_hex(sha1);
2306 struct strbuf filename = STRBUF_INIT;
2307 struct strbuf prevfile = STRBUF_INIT;
2308 int prevlocal;
2309 char prev_buf[PREV_BUF_SIZE];
2310 ssize_t prev_read = 0;
2311 off_t prev_posn = 0;
2312 struct http_object_request *freq;
2313
2314 freq = xcalloc(1, sizeof(*freq));
2315 strbuf_init(&freq->tmpfile, 0);
2316 hashcpy(freq->sha1, sha1);
2317 freq->localfile = -1;
2318
2319 sha1_file_name(the_repository, &filename, sha1);
2320 strbuf_addf(&freq->tmpfile, "%s.temp", filename.buf);
2321
2322 strbuf_addf(&prevfile, "%s.prev", filename.buf);
2323 unlink_or_warn(prevfile.buf);
2324 rename(freq->tmpfile.buf, prevfile.buf);
2325 unlink_or_warn(freq->tmpfile.buf);
2326 strbuf_release(&filename);
2327
2328 if (freq->localfile != -1)
2329 error("fd leakage in start: %d", freq->localfile);
2330 freq->localfile = open(freq->tmpfile.buf,
2331 O_WRONLY | O_CREAT | O_EXCL, 0666);
2332 /*
2333 * This could have failed due to the "lazy directory creation";
2334 * try to mkdir the last path component.
2335 */
2336 if (freq->localfile < 0 && errno == ENOENT) {
2337 char *dir = strrchr(freq->tmpfile.buf, '/');
2338 if (dir) {
2339 *dir = 0;
2340 mkdir(freq->tmpfile.buf, 0777);
2341 *dir = '/';
2342 }
2343 freq->localfile = open(freq->tmpfile.buf,
2344 O_WRONLY | O_CREAT | O_EXCL, 0666);
2345 }
2346
2347 if (freq->localfile < 0) {
2348 error_errno("Couldn't create temporary file %s",
2349 freq->tmpfile.buf);
2350 goto abort;
2351 }
2352
2353 git_inflate_init(&freq->stream);
2354
2355 git_SHA1_Init(&freq->c);
2356
2357 freq->url = get_remote_object_url(base_url, hex, 0);
2358
2359 /*
2360 * If a previous temp file is present, process what was already
2361 * fetched.
2362 */
2363 prevlocal = open(prevfile.buf, O_RDONLY);
2364 if (prevlocal != -1) {
2365 do {
2366 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2367 if (prev_read>0) {
2368 if (fwrite_sha1_file(prev_buf,
2369 1,
2370 prev_read,
2371 freq) == prev_read) {
2372 prev_posn += prev_read;
2373 } else {
2374 prev_read = -1;
2375 }
2376 }
2377 } while (prev_read > 0);
2378 close(prevlocal);
2379 }
2380 unlink_or_warn(prevfile.buf);
2381 strbuf_release(&prevfile);
2382
2383 /*
2384 * Reset inflate/SHA1 if there was an error reading the previous temp
2385 * file; also rewind to the beginning of the local file.
2386 */
2387 if (prev_read == -1) {
2388 memset(&freq->stream, 0, sizeof(freq->stream));
2389 git_inflate_init(&freq->stream);
2390 git_SHA1_Init(&freq->c);
2391 if (prev_posn>0) {
2392 prev_posn = 0;
2393 lseek(freq->localfile, 0, SEEK_SET);
2394 if (ftruncate(freq->localfile, 0) < 0) {
2395 error_errno("Couldn't truncate temporary file %s",
2396 freq->tmpfile.buf);
2397 goto abort;
2398 }
2399 }
2400 }
2401
2402 freq->slot = get_active_slot();
2403
2404 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2405 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2406 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2407 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2408 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2409 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2410
2411 /*
2412 * If we have successfully processed data from a previous fetch
2413 * attempt, only fetch the data we don't already have.
2414 */
2415 if (prev_posn>0) {
2416 if (http_is_verbose)
2417 fprintf(stderr,
2418 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2419 hex, (uintmax_t)prev_posn);
2420 http_opt_request_remainder(freq->slot->curl, prev_posn);
2421 }
2422
2423 return freq;
2424
2425 abort:
2426 strbuf_release(&prevfile);
2427 free(freq->url);
2428 free(freq);
2429 return NULL;
2430 }
2431
2432 void process_http_object_request(struct http_object_request *freq)
2433 {
2434 if (freq->slot == NULL)
2435 return;
2436 freq->curl_result = freq->slot->curl_result;
2437 freq->http_code = freq->slot->http_code;
2438 freq->slot = NULL;
2439 }
2440
2441 int finish_http_object_request(struct http_object_request *freq)
2442 {
2443 struct stat st;
2444 struct strbuf filename = STRBUF_INIT;
2445
2446 close(freq->localfile);
2447 freq->localfile = -1;
2448
2449 process_http_object_request(freq);
2450
2451 if (freq->http_code == 416) {
2452 warning("requested range invalid; we may already have all the data.");
2453 } else if (freq->curl_result != CURLE_OK) {
2454 if (stat(freq->tmpfile.buf, &st) == 0)
2455 if (st.st_size == 0)
2456 unlink_or_warn(freq->tmpfile.buf);
2457 return -1;
2458 }
2459
2460 git_inflate_end(&freq->stream);
2461 git_SHA1_Final(freq->real_sha1, &freq->c);
2462 if (freq->zret != Z_STREAM_END) {
2463 unlink_or_warn(freq->tmpfile.buf);
2464 return -1;
2465 }
2466 if (!hasheq(freq->sha1, freq->real_sha1)) {
2467 unlink_or_warn(freq->tmpfile.buf);
2468 return -1;
2469 }
2470 sha1_file_name(the_repository, &filename, freq->sha1);
2471 freq->rename = finalize_object_file(freq->tmpfile.buf, filename.buf);
2472 strbuf_release(&filename);
2473
2474 return freq->rename;
2475 }
2476
2477 void abort_http_object_request(struct http_object_request *freq)
2478 {
2479 unlink_or_warn(freq->tmpfile.buf);
2480
2481 release_http_object_request(freq);
2482 }
2483
2484 void release_http_object_request(struct http_object_request *freq)
2485 {
2486 if (freq->localfile != -1) {
2487 close(freq->localfile);
2488 freq->localfile = -1;
2489 }
2490 FREE_AND_NULL(freq->url);
2491 if (freq->slot != NULL) {
2492 freq->slot->callback_func = NULL;
2493 freq->slot->callback_data = NULL;
2494 release_active_slot(freq->slot);
2495 freq->slot = NULL;
2496 }
2497 strbuf_release(&freq->tmpfile);
2498 }
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