http: simplify parsing of remote objects/info/packs
[git/git.git] / http.c
1 #include "git-compat-util.h"
2 #include "http.h"
3 #include "config.h"
4 #include "pack.h"
5 #include "sideband.h"
6 #include "run-command.h"
7 #include "url.h"
8 #include "urlmatch.h"
9 #include "credential.h"
10 #include "version.h"
11 #include "pkt-line.h"
12 #include "gettext.h"
13 #include "transport.h"
14 #include "packfile.h"
15 #include "protocol.h"
16 #include "string-list.h"
17 #include "object-store.h"
18
19 static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
20 static int trace_curl_data = 1;
21 static struct string_list cookies_to_redact = STRING_LIST_INIT_DUP;
22 #if LIBCURL_VERSION_NUM >= 0x070a08
23 long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
24 #else
25 long int git_curl_ipresolve;
26 #endif
27 int active_requests;
28 int http_is_verbose;
29 ssize_t http_post_buffer = 16 * LARGE_PACKET_MAX;
30
31 #if LIBCURL_VERSION_NUM >= 0x070a06
32 #define LIBCURL_CAN_HANDLE_AUTH_ANY
33 #endif
34
35 static int min_curl_sessions = 1;
36 static int curl_session_count;
37 #ifdef USE_CURL_MULTI
38 static int max_requests = -1;
39 static CURLM *curlm;
40 #endif
41 #ifndef NO_CURL_EASY_DUPHANDLE
42 static CURL *curl_default;
43 #endif
44
45 #define PREV_BUF_SIZE 4096
46
47 char curl_errorstr[CURL_ERROR_SIZE];
48
49 static int curl_ssl_verify = -1;
50 static int curl_ssl_try;
51 static const char *curl_http_version = NULL;
52 static const char *ssl_cert;
53 static const char *ssl_cipherlist;
54 static const char *ssl_version;
55 static struct {
56 const char *name;
57 long ssl_version;
58 } sslversions[] = {
59 { "sslv2", CURL_SSLVERSION_SSLv2 },
60 { "sslv3", CURL_SSLVERSION_SSLv3 },
61 { "tlsv1", CURL_SSLVERSION_TLSv1 },
62 #if LIBCURL_VERSION_NUM >= 0x072200
63 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
64 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
65 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
66 #endif
67 #if LIBCURL_VERSION_NUM >= 0x073400
68 { "tlsv1.3", CURL_SSLVERSION_TLSv1_3 },
69 #endif
70 };
71 #if LIBCURL_VERSION_NUM >= 0x070903
72 static const char *ssl_key;
73 #endif
74 #if LIBCURL_VERSION_NUM >= 0x070908
75 static const char *ssl_capath;
76 #endif
77 #if LIBCURL_VERSION_NUM >= 0x071304
78 static const char *curl_no_proxy;
79 #endif
80 #if LIBCURL_VERSION_NUM >= 0x072c00
81 static const char *ssl_pinnedkey;
82 #endif
83 static const char *ssl_cainfo;
84 static long curl_low_speed_limit = -1;
85 static long curl_low_speed_time = -1;
86 static int curl_ftp_no_epsv;
87 static const char *curl_http_proxy;
88 static const char *http_proxy_authmethod;
89 static struct {
90 const char *name;
91 long curlauth_param;
92 } proxy_authmethods[] = {
93 { "basic", CURLAUTH_BASIC },
94 { "digest", CURLAUTH_DIGEST },
95 { "negotiate", CURLAUTH_GSSNEGOTIATE },
96 { "ntlm", CURLAUTH_NTLM },
97 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
98 { "anyauth", CURLAUTH_ANY },
99 #endif
100 /*
101 * CURLAUTH_DIGEST_IE has no corresponding command-line option in
102 * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
103 * here, too
104 */
105 };
106 #ifdef CURLGSSAPI_DELEGATION_FLAG
107 static const char *curl_deleg;
108 static struct {
109 const char *name;
110 long curl_deleg_param;
111 } curl_deleg_levels[] = {
112 { "none", CURLGSSAPI_DELEGATION_NONE },
113 { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
114 { "always", CURLGSSAPI_DELEGATION_FLAG },
115 };
116 #endif
117
118 static struct credential proxy_auth = CREDENTIAL_INIT;
119 static const char *curl_proxyuserpwd;
120 static const char *curl_cookie_file;
121 static int curl_save_cookies;
122 struct credential http_auth = CREDENTIAL_INIT;
123 static int http_proactive_auth;
124 static const char *user_agent;
125 static int curl_empty_auth = -1;
126
127 enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
128
129 #if LIBCURL_VERSION_NUM >= 0x071700
130 /* Use CURLOPT_KEYPASSWD as is */
131 #elif LIBCURL_VERSION_NUM >= 0x070903
132 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
133 #else
134 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
135 #endif
136
137 static struct credential cert_auth = CREDENTIAL_INIT;
138 static int ssl_cert_password_required;
139 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
140 static unsigned long http_auth_methods = CURLAUTH_ANY;
141 static int http_auth_methods_restricted;
142 /* Modes for which empty_auth cannot actually help us. */
143 static unsigned long empty_auth_useless =
144 CURLAUTH_BASIC
145 #ifdef CURLAUTH_DIGEST_IE
146 | CURLAUTH_DIGEST_IE
147 #endif
148 | CURLAUTH_DIGEST;
149 #endif
150
151 static struct curl_slist *pragma_header;
152 static struct curl_slist *no_pragma_header;
153 static struct curl_slist *extra_http_headers;
154
155 static struct active_request_slot *active_queue_head;
156
157 static char *cached_accept_language;
158
159 static char *http_ssl_backend;
160
161 static int http_schannel_check_revoke = 1;
162 /*
163 * With the backend being set to `schannel`, setting sslCAinfo would override
164 * the Certificate Store in cURL v7.60.0 and later, which is not what we want
165 * by default.
166 */
167 static int http_schannel_use_ssl_cainfo;
168
169 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
170 {
171 size_t size = eltsize * nmemb;
172 struct buffer *buffer = buffer_;
173
174 if (size > buffer->buf.len - buffer->posn)
175 size = buffer->buf.len - buffer->posn;
176 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
177 buffer->posn += size;
178
179 return size;
180 }
181
182 #ifndef NO_CURL_IOCTL
183 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
184 {
185 struct buffer *buffer = clientp;
186
187 switch (cmd) {
188 case CURLIOCMD_NOP:
189 return CURLIOE_OK;
190
191 case CURLIOCMD_RESTARTREAD:
192 buffer->posn = 0;
193 return CURLIOE_OK;
194
195 default:
196 return CURLIOE_UNKNOWNCMD;
197 }
198 }
199 #endif
200
201 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
202 {
203 size_t size = eltsize * nmemb;
204 struct strbuf *buffer = buffer_;
205
206 strbuf_add(buffer, ptr, size);
207 return size;
208 }
209
210 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
211 {
212 return eltsize * nmemb;
213 }
214
215 static void closedown_active_slot(struct active_request_slot *slot)
216 {
217 active_requests--;
218 slot->in_use = 0;
219 }
220
221 static void finish_active_slot(struct active_request_slot *slot)
222 {
223 closedown_active_slot(slot);
224 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
225
226 if (slot->finished != NULL)
227 (*slot->finished) = 1;
228
229 /* Store slot results so they can be read after the slot is reused */
230 if (slot->results != NULL) {
231 slot->results->curl_result = slot->curl_result;
232 slot->results->http_code = slot->http_code;
233 #if LIBCURL_VERSION_NUM >= 0x070a08
234 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
235 &slot->results->auth_avail);
236 #else
237 slot->results->auth_avail = 0;
238 #endif
239
240 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
241 &slot->results->http_connectcode);
242 }
243
244 /* Run callback if appropriate */
245 if (slot->callback_func != NULL)
246 slot->callback_func(slot->callback_data);
247 }
248
249 static void xmulti_remove_handle(struct active_request_slot *slot)
250 {
251 #ifdef USE_CURL_MULTI
252 curl_multi_remove_handle(curlm, slot->curl);
253 #endif
254 }
255
256 #ifdef USE_CURL_MULTI
257 static void process_curl_messages(void)
258 {
259 int num_messages;
260 struct active_request_slot *slot;
261 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
262
263 while (curl_message != NULL) {
264 if (curl_message->msg == CURLMSG_DONE) {
265 int curl_result = curl_message->data.result;
266 slot = active_queue_head;
267 while (slot != NULL &&
268 slot->curl != curl_message->easy_handle)
269 slot = slot->next;
270 if (slot != NULL) {
271 xmulti_remove_handle(slot);
272 slot->curl_result = curl_result;
273 finish_active_slot(slot);
274 } else {
275 fprintf(stderr, "Received DONE message for unknown request!\n");
276 }
277 } else {
278 fprintf(stderr, "Unknown CURL message received: %d\n",
279 (int)curl_message->msg);
280 }
281 curl_message = curl_multi_info_read(curlm, &num_messages);
282 }
283 }
284 #endif
285
286 static int http_options(const char *var, const char *value, void *cb)
287 {
288 if (!strcmp("http.version", var)) {
289 return git_config_string(&curl_http_version, var, value);
290 }
291 if (!strcmp("http.sslverify", var)) {
292 curl_ssl_verify = git_config_bool(var, value);
293 return 0;
294 }
295 if (!strcmp("http.sslcipherlist", var))
296 return git_config_string(&ssl_cipherlist, var, value);
297 if (!strcmp("http.sslversion", var))
298 return git_config_string(&ssl_version, var, value);
299 if (!strcmp("http.sslcert", var))
300 return git_config_pathname(&ssl_cert, var, value);
301 #if LIBCURL_VERSION_NUM >= 0x070903
302 if (!strcmp("http.sslkey", var))
303 return git_config_pathname(&ssl_key, var, value);
304 #endif
305 #if LIBCURL_VERSION_NUM >= 0x070908
306 if (!strcmp("http.sslcapath", var))
307 return git_config_pathname(&ssl_capath, var, value);
308 #endif
309 if (!strcmp("http.sslcainfo", var))
310 return git_config_pathname(&ssl_cainfo, var, value);
311 if (!strcmp("http.sslcertpasswordprotected", var)) {
312 ssl_cert_password_required = git_config_bool(var, value);
313 return 0;
314 }
315 if (!strcmp("http.ssltry", var)) {
316 curl_ssl_try = git_config_bool(var, value);
317 return 0;
318 }
319 if (!strcmp("http.sslbackend", var)) {
320 free(http_ssl_backend);
321 http_ssl_backend = xstrdup_or_null(value);
322 return 0;
323 }
324
325 if (!strcmp("http.schannelcheckrevoke", var)) {
326 http_schannel_check_revoke = git_config_bool(var, value);
327 return 0;
328 }
329
330 if (!strcmp("http.schannelusesslcainfo", var)) {
331 http_schannel_use_ssl_cainfo = git_config_bool(var, value);
332 return 0;
333 }
334
335 if (!strcmp("http.minsessions", var)) {
336 min_curl_sessions = git_config_int(var, value);
337 #ifndef USE_CURL_MULTI
338 if (min_curl_sessions > 1)
339 min_curl_sessions = 1;
340 #endif
341 return 0;
342 }
343 #ifdef USE_CURL_MULTI
344 if (!strcmp("http.maxrequests", var)) {
345 max_requests = git_config_int(var, value);
346 return 0;
347 }
348 #endif
349 if (!strcmp("http.lowspeedlimit", var)) {
350 curl_low_speed_limit = (long)git_config_int(var, value);
351 return 0;
352 }
353 if (!strcmp("http.lowspeedtime", var)) {
354 curl_low_speed_time = (long)git_config_int(var, value);
355 return 0;
356 }
357
358 if (!strcmp("http.noepsv", var)) {
359 curl_ftp_no_epsv = git_config_bool(var, value);
360 return 0;
361 }
362 if (!strcmp("http.proxy", var))
363 return git_config_string(&curl_http_proxy, var, value);
364
365 if (!strcmp("http.proxyauthmethod", var))
366 return git_config_string(&http_proxy_authmethod, var, value);
367
368 if (!strcmp("http.cookiefile", var))
369 return git_config_pathname(&curl_cookie_file, var, value);
370 if (!strcmp("http.savecookies", var)) {
371 curl_save_cookies = git_config_bool(var, value);
372 return 0;
373 }
374
375 if (!strcmp("http.postbuffer", var)) {
376 http_post_buffer = git_config_ssize_t(var, value);
377 if (http_post_buffer < 0)
378 warning(_("negative value for http.postbuffer; defaulting to %d"), LARGE_PACKET_MAX);
379 if (http_post_buffer < LARGE_PACKET_MAX)
380 http_post_buffer = LARGE_PACKET_MAX;
381 return 0;
382 }
383
384 if (!strcmp("http.useragent", var))
385 return git_config_string(&user_agent, var, value);
386
387 if (!strcmp("http.emptyauth", var)) {
388 if (value && !strcmp("auto", value))
389 curl_empty_auth = -1;
390 else
391 curl_empty_auth = git_config_bool(var, value);
392 return 0;
393 }
394
395 if (!strcmp("http.delegation", var)) {
396 #ifdef CURLGSSAPI_DELEGATION_FLAG
397 return git_config_string(&curl_deleg, var, value);
398 #else
399 warning(_("Delegation control is not supported with cURL < 7.22.0"));
400 return 0;
401 #endif
402 }
403
404 if (!strcmp("http.pinnedpubkey", var)) {
405 #if LIBCURL_VERSION_NUM >= 0x072c00
406 return git_config_pathname(&ssl_pinnedkey, var, value);
407 #else
408 warning(_("Public key pinning not supported with cURL < 7.44.0"));
409 return 0;
410 #endif
411 }
412
413 if (!strcmp("http.extraheader", var)) {
414 if (!value) {
415 return config_error_nonbool(var);
416 } else if (!*value) {
417 curl_slist_free_all(extra_http_headers);
418 extra_http_headers = NULL;
419 } else {
420 extra_http_headers =
421 curl_slist_append(extra_http_headers, value);
422 }
423 return 0;
424 }
425
426 if (!strcmp("http.followredirects", var)) {
427 if (value && !strcmp(value, "initial"))
428 http_follow_config = HTTP_FOLLOW_INITIAL;
429 else if (git_config_bool(var, value))
430 http_follow_config = HTTP_FOLLOW_ALWAYS;
431 else
432 http_follow_config = HTTP_FOLLOW_NONE;
433 return 0;
434 }
435
436 /* Fall back on the default ones */
437 return git_default_config(var, value, cb);
438 }
439
440 static int curl_empty_auth_enabled(void)
441 {
442 if (curl_empty_auth >= 0)
443 return curl_empty_auth;
444
445 #ifndef LIBCURL_CAN_HANDLE_AUTH_ANY
446 /*
447 * Our libcurl is too old to do AUTH_ANY in the first place;
448 * just default to turning the feature off.
449 */
450 #else
451 /*
452 * In the automatic case, kick in the empty-auth
453 * hack as long as we would potentially try some
454 * method more exotic than "Basic" or "Digest".
455 *
456 * But only do this when this is our second or
457 * subsequent request, as by then we know what
458 * methods are available.
459 */
460 if (http_auth_methods_restricted &&
461 (http_auth_methods & ~empty_auth_useless))
462 return 1;
463 #endif
464 return 0;
465 }
466
467 static void init_curl_http_auth(CURL *result)
468 {
469 if (!http_auth.username || !*http_auth.username) {
470 if (curl_empty_auth_enabled())
471 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
472 return;
473 }
474
475 credential_fill(&http_auth);
476
477 #if LIBCURL_VERSION_NUM >= 0x071301
478 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
479 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
480 #else
481 {
482 static struct strbuf up = STRBUF_INIT;
483 /*
484 * Note that we assume we only ever have a single set of
485 * credentials in a given program run, so we do not have
486 * to worry about updating this buffer, only setting its
487 * initial value.
488 */
489 if (!up.len)
490 strbuf_addf(&up, "%s:%s",
491 http_auth.username, http_auth.password);
492 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
493 }
494 #endif
495 }
496
497 /* *var must be free-able */
498 static void var_override(const char **var, char *value)
499 {
500 if (value) {
501 free((void *)*var);
502 *var = xstrdup(value);
503 }
504 }
505
506 static void set_proxyauth_name_password(CURL *result)
507 {
508 #if LIBCURL_VERSION_NUM >= 0x071301
509 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
510 proxy_auth.username);
511 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
512 proxy_auth.password);
513 #else
514 struct strbuf s = STRBUF_INIT;
515
516 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
517 strbuf_addch(&s, ':');
518 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
519 curl_proxyuserpwd = strbuf_detach(&s, NULL);
520 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
521 #endif
522 }
523
524 static void init_curl_proxy_auth(CURL *result)
525 {
526 if (proxy_auth.username) {
527 if (!proxy_auth.password)
528 credential_fill(&proxy_auth);
529 set_proxyauth_name_password(result);
530 }
531
532 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
533
534 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
535 if (http_proxy_authmethod) {
536 int i;
537 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
538 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
539 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
540 proxy_authmethods[i].curlauth_param);
541 break;
542 }
543 }
544 if (i == ARRAY_SIZE(proxy_authmethods)) {
545 warning("unsupported proxy authentication method %s: using anyauth",
546 http_proxy_authmethod);
547 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
548 }
549 }
550 else
551 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
552 #endif
553 }
554
555 static int has_cert_password(void)
556 {
557 if (ssl_cert == NULL || ssl_cert_password_required != 1)
558 return 0;
559 if (!cert_auth.password) {
560 cert_auth.protocol = xstrdup("cert");
561 cert_auth.username = xstrdup("");
562 cert_auth.path = xstrdup(ssl_cert);
563 credential_fill(&cert_auth);
564 }
565 return 1;
566 }
567
568 #if LIBCURL_VERSION_NUM >= 0x071900
569 static void set_curl_keepalive(CURL *c)
570 {
571 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
572 }
573
574 #elif LIBCURL_VERSION_NUM >= 0x071000
575 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
576 {
577 int ka = 1;
578 int rc;
579 socklen_t len = (socklen_t)sizeof(ka);
580
581 if (type != CURLSOCKTYPE_IPCXN)
582 return 0;
583
584 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
585 if (rc < 0)
586 warning_errno("unable to set SO_KEEPALIVE on socket");
587
588 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
589 }
590
591 static void set_curl_keepalive(CURL *c)
592 {
593 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
594 }
595
596 #else
597 static void set_curl_keepalive(CURL *c)
598 {
599 /* not supported on older curl versions */
600 }
601 #endif
602
603 static void redact_sensitive_header(struct strbuf *header)
604 {
605 const char *sensitive_header;
606
607 if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
608 skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
609 /* The first token is the type, which is OK to log */
610 while (isspace(*sensitive_header))
611 sensitive_header++;
612 while (*sensitive_header && !isspace(*sensitive_header))
613 sensitive_header++;
614 /* Everything else is opaque and possibly sensitive */
615 strbuf_setlen(header, sensitive_header - header->buf);
616 strbuf_addstr(header, " <redacted>");
617 } else if (cookies_to_redact.nr &&
618 skip_prefix(header->buf, "Cookie:", &sensitive_header)) {
619 struct strbuf redacted_header = STRBUF_INIT;
620 char *cookie;
621
622 while (isspace(*sensitive_header))
623 sensitive_header++;
624
625 /*
626 * The contents of header starting from sensitive_header will
627 * subsequently be overridden, so it is fine to mutate this
628 * string (hence the assignment to "char *").
629 */
630 cookie = (char *) sensitive_header;
631
632 while (cookie) {
633 char *equals;
634 char *semicolon = strstr(cookie, "; ");
635 if (semicolon)
636 *semicolon = 0;
637 equals = strchrnul(cookie, '=');
638 if (!equals) {
639 /* invalid cookie, just append and continue */
640 strbuf_addstr(&redacted_header, cookie);
641 continue;
642 }
643 *equals = 0; /* temporarily set to NUL for lookup */
644 if (string_list_lookup(&cookies_to_redact, cookie)) {
645 strbuf_addstr(&redacted_header, cookie);
646 strbuf_addstr(&redacted_header, "=<redacted>");
647 } else {
648 *equals = '=';
649 strbuf_addstr(&redacted_header, cookie);
650 }
651 if (semicolon) {
652 /*
653 * There are more cookies. (Or, for some
654 * reason, the input string ends in "; ".)
655 */
656 strbuf_addstr(&redacted_header, "; ");
657 cookie = semicolon + strlen("; ");
658 } else {
659 cookie = NULL;
660 }
661 }
662
663 strbuf_setlen(header, sensitive_header - header->buf);
664 strbuf_addbuf(header, &redacted_header);
665 }
666 }
667
668 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
669 {
670 struct strbuf out = STRBUF_INIT;
671 struct strbuf **headers, **header;
672
673 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
674 text, (long)size, (long)size);
675 trace_strbuf(&trace_curl, &out);
676 strbuf_reset(&out);
677 strbuf_add(&out, ptr, size);
678 headers = strbuf_split_max(&out, '\n', 0);
679
680 for (header = headers; *header; header++) {
681 if (hide_sensitive_header)
682 redact_sensitive_header(*header);
683 strbuf_insert((*header), 0, text, strlen(text));
684 strbuf_insert((*header), strlen(text), ": ", 2);
685 strbuf_rtrim((*header));
686 strbuf_addch((*header), '\n');
687 trace_strbuf(&trace_curl, (*header));
688 }
689 strbuf_list_free(headers);
690 strbuf_release(&out);
691 }
692
693 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
694 {
695 size_t i;
696 struct strbuf out = STRBUF_INIT;
697 unsigned int width = 60;
698
699 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
700 text, (long)size, (long)size);
701 trace_strbuf(&trace_curl, &out);
702
703 for (i = 0; i < size; i += width) {
704 size_t w;
705
706 strbuf_reset(&out);
707 strbuf_addf(&out, "%s: ", text);
708 for (w = 0; (w < width) && (i + w < size); w++) {
709 unsigned char ch = ptr[i + w];
710
711 strbuf_addch(&out,
712 (ch >= 0x20) && (ch < 0x80)
713 ? ch : '.');
714 }
715 strbuf_addch(&out, '\n');
716 trace_strbuf(&trace_curl, &out);
717 }
718 strbuf_release(&out);
719 }
720
721 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
722 {
723 const char *text;
724 enum { NO_FILTER = 0, DO_FILTER = 1 };
725
726 switch (type) {
727 case CURLINFO_TEXT:
728 trace_printf_key(&trace_curl, "== Info: %s", data);
729 break;
730 case CURLINFO_HEADER_OUT:
731 text = "=> Send header";
732 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
733 break;
734 case CURLINFO_DATA_OUT:
735 if (trace_curl_data) {
736 text = "=> Send data";
737 curl_dump_data(text, (unsigned char *)data, size);
738 }
739 break;
740 case CURLINFO_SSL_DATA_OUT:
741 if (trace_curl_data) {
742 text = "=> Send SSL data";
743 curl_dump_data(text, (unsigned char *)data, size);
744 }
745 break;
746 case CURLINFO_HEADER_IN:
747 text = "<= Recv header";
748 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
749 break;
750 case CURLINFO_DATA_IN:
751 if (trace_curl_data) {
752 text = "<= Recv data";
753 curl_dump_data(text, (unsigned char *)data, size);
754 }
755 break;
756 case CURLINFO_SSL_DATA_IN:
757 if (trace_curl_data) {
758 text = "<= Recv SSL data";
759 curl_dump_data(text, (unsigned char *)data, size);
760 }
761 break;
762
763 default: /* we ignore unknown types by default */
764 return 0;
765 }
766 return 0;
767 }
768
769 void setup_curl_trace(CURL *handle)
770 {
771 if (!trace_want(&trace_curl))
772 return;
773 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
774 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
775 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
776 }
777
778 #ifdef CURLPROTO_HTTP
779 static long get_curl_allowed_protocols(int from_user)
780 {
781 long allowed_protocols = 0;
782
783 if (is_transport_allowed("http", from_user))
784 allowed_protocols |= CURLPROTO_HTTP;
785 if (is_transport_allowed("https", from_user))
786 allowed_protocols |= CURLPROTO_HTTPS;
787 if (is_transport_allowed("ftp", from_user))
788 allowed_protocols |= CURLPROTO_FTP;
789 if (is_transport_allowed("ftps", from_user))
790 allowed_protocols |= CURLPROTO_FTPS;
791
792 return allowed_protocols;
793 }
794 #endif
795
796 #if LIBCURL_VERSION_NUM >=0x072f00
797 static int get_curl_http_version_opt(const char *version_string, long *opt)
798 {
799 int i;
800 static struct {
801 const char *name;
802 long opt_token;
803 } choice[] = {
804 { "HTTP/1.1", CURL_HTTP_VERSION_1_1 },
805 { "HTTP/2", CURL_HTTP_VERSION_2 }
806 };
807
808 for (i = 0; i < ARRAY_SIZE(choice); i++) {
809 if (!strcmp(version_string, choice[i].name)) {
810 *opt = choice[i].opt_token;
811 return 0;
812 }
813 }
814
815 warning("unknown value given to http.version: '%s'", version_string);
816 return -1; /* not found */
817 }
818
819 #endif
820
821 static CURL *get_curl_handle(void)
822 {
823 CURL *result = curl_easy_init();
824
825 if (!result)
826 die("curl_easy_init failed");
827
828 if (!curl_ssl_verify) {
829 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
830 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
831 } else {
832 /* Verify authenticity of the peer's certificate */
833 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
834 /* The name in the cert must match whom we tried to connect */
835 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
836 }
837
838 #if LIBCURL_VERSION_NUM >= 0x072f00 // 7.47.0
839 if (curl_http_version) {
840 long opt;
841 if (!get_curl_http_version_opt(curl_http_version, &opt)) {
842 /* Set request use http version */
843 curl_easy_setopt(result, CURLOPT_HTTP_VERSION, opt);
844 }
845 }
846 #endif
847
848 #if LIBCURL_VERSION_NUM >= 0x070907
849 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
850 #endif
851 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
852 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
853 #endif
854
855 #ifdef CURLGSSAPI_DELEGATION_FLAG
856 if (curl_deleg) {
857 int i;
858 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
859 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
860 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
861 curl_deleg_levels[i].curl_deleg_param);
862 break;
863 }
864 }
865 if (i == ARRAY_SIZE(curl_deleg_levels))
866 warning("Unknown delegation method '%s': using default",
867 curl_deleg);
868 }
869 #endif
870
871 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
872 !http_schannel_check_revoke) {
873 #if LIBCURL_VERSION_NUM >= 0x072c00
874 curl_easy_setopt(result, CURLOPT_SSL_OPTIONS, CURLSSLOPT_NO_REVOKE);
875 #else
876 warning(_("CURLSSLOPT_NO_REVOKE not supported with cURL < 7.44.0"));
877 #endif
878 }
879
880 if (http_proactive_auth)
881 init_curl_http_auth(result);
882
883 if (getenv("GIT_SSL_VERSION"))
884 ssl_version = getenv("GIT_SSL_VERSION");
885 if (ssl_version && *ssl_version) {
886 int i;
887 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
888 if (!strcmp(ssl_version, sslversions[i].name)) {
889 curl_easy_setopt(result, CURLOPT_SSLVERSION,
890 sslversions[i].ssl_version);
891 break;
892 }
893 }
894 if (i == ARRAY_SIZE(sslversions))
895 warning("unsupported ssl version %s: using default",
896 ssl_version);
897 }
898
899 if (getenv("GIT_SSL_CIPHER_LIST"))
900 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
901 if (ssl_cipherlist != NULL && *ssl_cipherlist)
902 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
903 ssl_cipherlist);
904
905 if (ssl_cert != NULL)
906 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
907 if (has_cert_password())
908 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
909 #if LIBCURL_VERSION_NUM >= 0x070903
910 if (ssl_key != NULL)
911 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
912 #endif
913 #if LIBCURL_VERSION_NUM >= 0x070908
914 if (ssl_capath != NULL)
915 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
916 #endif
917 #if LIBCURL_VERSION_NUM >= 0x072c00
918 if (ssl_pinnedkey != NULL)
919 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
920 #endif
921 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
922 !http_schannel_use_ssl_cainfo) {
923 curl_easy_setopt(result, CURLOPT_CAINFO, NULL);
924 #if LIBCURL_VERSION_NUM >= 0x073400
925 curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, NULL);
926 #endif
927 } else if (ssl_cainfo != NULL)
928 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
929
930 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
931 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
932 curl_low_speed_limit);
933 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
934 curl_low_speed_time);
935 }
936
937 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
938 #if LIBCURL_VERSION_NUM >= 0x071301
939 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
940 #elif LIBCURL_VERSION_NUM >= 0x071101
941 curl_easy_setopt(result, CURLOPT_POST301, 1);
942 #endif
943 #ifdef CURLPROTO_HTTP
944 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
945 get_curl_allowed_protocols(0));
946 curl_easy_setopt(result, CURLOPT_PROTOCOLS,
947 get_curl_allowed_protocols(-1));
948 #else
949 warning(_("Protocol restrictions not supported with cURL < 7.19.4"));
950 #endif
951 if (getenv("GIT_CURL_VERBOSE"))
952 curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
953 setup_curl_trace(result);
954 if (getenv("GIT_TRACE_CURL_NO_DATA"))
955 trace_curl_data = 0;
956 if (getenv("GIT_REDACT_COOKIES")) {
957 string_list_split(&cookies_to_redact,
958 getenv("GIT_REDACT_COOKIES"), ',', -1);
959 string_list_sort(&cookies_to_redact);
960 }
961
962 curl_easy_setopt(result, CURLOPT_USERAGENT,
963 user_agent ? user_agent : git_user_agent());
964
965 if (curl_ftp_no_epsv)
966 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
967
968 #ifdef CURLOPT_USE_SSL
969 if (curl_ssl_try)
970 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
971 #endif
972
973 /*
974 * CURL also examines these variables as a fallback; but we need to query
975 * them here in order to decide whether to prompt for missing password (cf.
976 * init_curl_proxy_auth()).
977 *
978 * Unlike many other common environment variables, these are historically
979 * lowercase only. It appears that CURL did not know this and implemented
980 * only uppercase variants, which was later corrected to take both - with
981 * the exception of http_proxy, which is lowercase only also in CURL. As
982 * the lowercase versions are the historical quasi-standard, they take
983 * precedence here, as in CURL.
984 */
985 if (!curl_http_proxy) {
986 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
987 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
988 var_override(&curl_http_proxy, getenv("https_proxy"));
989 } else {
990 var_override(&curl_http_proxy, getenv("http_proxy"));
991 }
992 if (!curl_http_proxy) {
993 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
994 var_override(&curl_http_proxy, getenv("all_proxy"));
995 }
996 }
997
998 if (curl_http_proxy && curl_http_proxy[0] == '\0') {
999 /*
1000 * Handle case with the empty http.proxy value here to keep
1001 * common code clean.
1002 * NB: empty option disables proxying at all.
1003 */
1004 curl_easy_setopt(result, CURLOPT_PROXY, "");
1005 } else if (curl_http_proxy) {
1006 #if LIBCURL_VERSION_NUM >= 0x071800
1007 if (starts_with(curl_http_proxy, "socks5h"))
1008 curl_easy_setopt(result,
1009 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
1010 else if (starts_with(curl_http_proxy, "socks5"))
1011 curl_easy_setopt(result,
1012 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
1013 else if (starts_with(curl_http_proxy, "socks4a"))
1014 curl_easy_setopt(result,
1015 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
1016 else if (starts_with(curl_http_proxy, "socks"))
1017 curl_easy_setopt(result,
1018 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
1019 #endif
1020 #if LIBCURL_VERSION_NUM >= 0x073400
1021 else if (starts_with(curl_http_proxy, "https"))
1022 curl_easy_setopt(result,
1023 CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
1024 #endif
1025 if (strstr(curl_http_proxy, "://"))
1026 credential_from_url(&proxy_auth, curl_http_proxy);
1027 else {
1028 struct strbuf url = STRBUF_INIT;
1029 strbuf_addf(&url, "http://%s", curl_http_proxy);
1030 credential_from_url(&proxy_auth, url.buf);
1031 strbuf_release(&url);
1032 }
1033
1034 if (!proxy_auth.host)
1035 die("Invalid proxy URL '%s'", curl_http_proxy);
1036
1037 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
1038 #if LIBCURL_VERSION_NUM >= 0x071304
1039 var_override(&curl_no_proxy, getenv("NO_PROXY"));
1040 var_override(&curl_no_proxy, getenv("no_proxy"));
1041 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
1042 #endif
1043 }
1044 init_curl_proxy_auth(result);
1045
1046 set_curl_keepalive(result);
1047
1048 return result;
1049 }
1050
1051 static void set_from_env(const char **var, const char *envname)
1052 {
1053 const char *val = getenv(envname);
1054 if (val)
1055 *var = val;
1056 }
1057
1058 void http_init(struct remote *remote, const char *url, int proactive_auth)
1059 {
1060 char *low_speed_limit;
1061 char *low_speed_time;
1062 char *normalized_url;
1063 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
1064
1065 config.section = "http";
1066 config.key = NULL;
1067 config.collect_fn = http_options;
1068 config.cascade_fn = git_default_config;
1069 config.cb = NULL;
1070
1071 http_is_verbose = 0;
1072 normalized_url = url_normalize(url, &config.url);
1073
1074 git_config(urlmatch_config_entry, &config);
1075 free(normalized_url);
1076
1077 #if LIBCURL_VERSION_NUM >= 0x073800
1078 if (http_ssl_backend) {
1079 const curl_ssl_backend **backends;
1080 struct strbuf buf = STRBUF_INIT;
1081 int i;
1082
1083 switch (curl_global_sslset(-1, http_ssl_backend, &backends)) {
1084 case CURLSSLSET_UNKNOWN_BACKEND:
1085 strbuf_addf(&buf, _("Unsupported SSL backend '%s'. "
1086 "Supported SSL backends:"),
1087 http_ssl_backend);
1088 for (i = 0; backends[i]; i++)
1089 strbuf_addf(&buf, "\n\t%s", backends[i]->name);
1090 die("%s", buf.buf);
1091 case CURLSSLSET_NO_BACKENDS:
1092 die(_("Could not set SSL backend to '%s': "
1093 "cURL was built without SSL backends"),
1094 http_ssl_backend);
1095 case CURLSSLSET_TOO_LATE:
1096 die(_("Could not set SSL backend to '%s': already set"),
1097 http_ssl_backend);
1098 case CURLSSLSET_OK:
1099 break; /* Okay! */
1100 }
1101 }
1102 #endif
1103
1104 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1105 die("curl_global_init failed");
1106
1107 http_proactive_auth = proactive_auth;
1108
1109 if (remote && remote->http_proxy)
1110 curl_http_proxy = xstrdup(remote->http_proxy);
1111
1112 if (remote)
1113 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
1114
1115 pragma_header = curl_slist_append(http_copy_default_headers(),
1116 "Pragma: no-cache");
1117 no_pragma_header = curl_slist_append(http_copy_default_headers(),
1118 "Pragma:");
1119
1120 #ifdef USE_CURL_MULTI
1121 {
1122 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1123 if (http_max_requests != NULL)
1124 max_requests = atoi(http_max_requests);
1125 }
1126
1127 curlm = curl_multi_init();
1128 if (!curlm)
1129 die("curl_multi_init failed");
1130 #endif
1131
1132 if (getenv("GIT_SSL_NO_VERIFY"))
1133 curl_ssl_verify = 0;
1134
1135 set_from_env(&ssl_cert, "GIT_SSL_CERT");
1136 #if LIBCURL_VERSION_NUM >= 0x070903
1137 set_from_env(&ssl_key, "GIT_SSL_KEY");
1138 #endif
1139 #if LIBCURL_VERSION_NUM >= 0x070908
1140 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
1141 #endif
1142 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
1143
1144 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
1145
1146 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1147 if (low_speed_limit != NULL)
1148 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1149 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1150 if (low_speed_time != NULL)
1151 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1152
1153 if (curl_ssl_verify == -1)
1154 curl_ssl_verify = 1;
1155
1156 curl_session_count = 0;
1157 #ifdef USE_CURL_MULTI
1158 if (max_requests < 1)
1159 max_requests = DEFAULT_MAX_REQUESTS;
1160 #endif
1161
1162 if (getenv("GIT_CURL_FTP_NO_EPSV"))
1163 curl_ftp_no_epsv = 1;
1164
1165 if (url) {
1166 credential_from_url(&http_auth, url);
1167 if (!ssl_cert_password_required &&
1168 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1169 starts_with(url, "https://"))
1170 ssl_cert_password_required = 1;
1171 }
1172
1173 #ifndef NO_CURL_EASY_DUPHANDLE
1174 curl_default = get_curl_handle();
1175 #endif
1176 }
1177
1178 void http_cleanup(void)
1179 {
1180 struct active_request_slot *slot = active_queue_head;
1181
1182 while (slot != NULL) {
1183 struct active_request_slot *next = slot->next;
1184 if (slot->curl != NULL) {
1185 xmulti_remove_handle(slot);
1186 curl_easy_cleanup(slot->curl);
1187 }
1188 free(slot);
1189 slot = next;
1190 }
1191 active_queue_head = NULL;
1192
1193 #ifndef NO_CURL_EASY_DUPHANDLE
1194 curl_easy_cleanup(curl_default);
1195 #endif
1196
1197 #ifdef USE_CURL_MULTI
1198 curl_multi_cleanup(curlm);
1199 #endif
1200 curl_global_cleanup();
1201
1202 curl_slist_free_all(extra_http_headers);
1203 extra_http_headers = NULL;
1204
1205 curl_slist_free_all(pragma_header);
1206 pragma_header = NULL;
1207
1208 curl_slist_free_all(no_pragma_header);
1209 no_pragma_header = NULL;
1210
1211 if (curl_http_proxy) {
1212 free((void *)curl_http_proxy);
1213 curl_http_proxy = NULL;
1214 }
1215
1216 if (proxy_auth.password) {
1217 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1218 FREE_AND_NULL(proxy_auth.password);
1219 }
1220
1221 free((void *)curl_proxyuserpwd);
1222 curl_proxyuserpwd = NULL;
1223
1224 free((void *)http_proxy_authmethod);
1225 http_proxy_authmethod = NULL;
1226
1227 if (cert_auth.password != NULL) {
1228 memset(cert_auth.password, 0, strlen(cert_auth.password));
1229 FREE_AND_NULL(cert_auth.password);
1230 }
1231 ssl_cert_password_required = 0;
1232
1233 FREE_AND_NULL(cached_accept_language);
1234 }
1235
1236 struct active_request_slot *get_active_slot(void)
1237 {
1238 struct active_request_slot *slot = active_queue_head;
1239 struct active_request_slot *newslot;
1240
1241 #ifdef USE_CURL_MULTI
1242 int num_transfers;
1243
1244 /* Wait for a slot to open up if the queue is full */
1245 while (active_requests >= max_requests) {
1246 curl_multi_perform(curlm, &num_transfers);
1247 if (num_transfers < active_requests)
1248 process_curl_messages();
1249 }
1250 #endif
1251
1252 while (slot != NULL && slot->in_use)
1253 slot = slot->next;
1254
1255 if (slot == NULL) {
1256 newslot = xmalloc(sizeof(*newslot));
1257 newslot->curl = NULL;
1258 newslot->in_use = 0;
1259 newslot->next = NULL;
1260
1261 slot = active_queue_head;
1262 if (slot == NULL) {
1263 active_queue_head = newslot;
1264 } else {
1265 while (slot->next != NULL)
1266 slot = slot->next;
1267 slot->next = newslot;
1268 }
1269 slot = newslot;
1270 }
1271
1272 if (slot->curl == NULL) {
1273 #ifdef NO_CURL_EASY_DUPHANDLE
1274 slot->curl = get_curl_handle();
1275 #else
1276 slot->curl = curl_easy_duphandle(curl_default);
1277 #endif
1278 curl_session_count++;
1279 }
1280
1281 active_requests++;
1282 slot->in_use = 1;
1283 slot->results = NULL;
1284 slot->finished = NULL;
1285 slot->callback_data = NULL;
1286 slot->callback_func = NULL;
1287 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1288 if (curl_save_cookies)
1289 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1290 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1291 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1292 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1293 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1294 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1295 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1296 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1297 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1298 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1299 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1300
1301 /*
1302 * Default following to off unless "ALWAYS" is configured; this gives
1303 * callers a sane starting point, and they can tweak for individual
1304 * HTTP_FOLLOW_* cases themselves.
1305 */
1306 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1307 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1308 else
1309 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1310
1311 #if LIBCURL_VERSION_NUM >= 0x070a08
1312 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1313 #endif
1314 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1315 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1316 #endif
1317 if (http_auth.password || curl_empty_auth_enabled())
1318 init_curl_http_auth(slot->curl);
1319
1320 return slot;
1321 }
1322
1323 int start_active_slot(struct active_request_slot *slot)
1324 {
1325 #ifdef USE_CURL_MULTI
1326 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1327 int num_transfers;
1328
1329 if (curlm_result != CURLM_OK &&
1330 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1331 warning("curl_multi_add_handle failed: %s",
1332 curl_multi_strerror(curlm_result));
1333 active_requests--;
1334 slot->in_use = 0;
1335 return 0;
1336 }
1337
1338 /*
1339 * We know there must be something to do, since we just added
1340 * something.
1341 */
1342 curl_multi_perform(curlm, &num_transfers);
1343 #endif
1344 return 1;
1345 }
1346
1347 #ifdef USE_CURL_MULTI
1348 struct fill_chain {
1349 void *data;
1350 int (*fill)(void *);
1351 struct fill_chain *next;
1352 };
1353
1354 static struct fill_chain *fill_cfg;
1355
1356 void add_fill_function(void *data, int (*fill)(void *))
1357 {
1358 struct fill_chain *new_fill = xmalloc(sizeof(*new_fill));
1359 struct fill_chain **linkp = &fill_cfg;
1360 new_fill->data = data;
1361 new_fill->fill = fill;
1362 new_fill->next = NULL;
1363 while (*linkp)
1364 linkp = &(*linkp)->next;
1365 *linkp = new_fill;
1366 }
1367
1368 void fill_active_slots(void)
1369 {
1370 struct active_request_slot *slot = active_queue_head;
1371
1372 while (active_requests < max_requests) {
1373 struct fill_chain *fill;
1374 for (fill = fill_cfg; fill; fill = fill->next)
1375 if (fill->fill(fill->data))
1376 break;
1377
1378 if (!fill)
1379 break;
1380 }
1381
1382 while (slot != NULL) {
1383 if (!slot->in_use && slot->curl != NULL
1384 && curl_session_count > min_curl_sessions) {
1385 curl_easy_cleanup(slot->curl);
1386 slot->curl = NULL;
1387 curl_session_count--;
1388 }
1389 slot = slot->next;
1390 }
1391 }
1392
1393 void step_active_slots(void)
1394 {
1395 int num_transfers;
1396 CURLMcode curlm_result;
1397
1398 do {
1399 curlm_result = curl_multi_perform(curlm, &num_transfers);
1400 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1401 if (num_transfers < active_requests) {
1402 process_curl_messages();
1403 fill_active_slots();
1404 }
1405 }
1406 #endif
1407
1408 void run_active_slot(struct active_request_slot *slot)
1409 {
1410 #ifdef USE_CURL_MULTI
1411 fd_set readfds;
1412 fd_set writefds;
1413 fd_set excfds;
1414 int max_fd;
1415 struct timeval select_timeout;
1416 int finished = 0;
1417
1418 slot->finished = &finished;
1419 while (!finished) {
1420 step_active_slots();
1421
1422 if (slot->in_use) {
1423 #if LIBCURL_VERSION_NUM >= 0x070f04
1424 long curl_timeout;
1425 curl_multi_timeout(curlm, &curl_timeout);
1426 if (curl_timeout == 0) {
1427 continue;
1428 } else if (curl_timeout == -1) {
1429 select_timeout.tv_sec = 0;
1430 select_timeout.tv_usec = 50000;
1431 } else {
1432 select_timeout.tv_sec = curl_timeout / 1000;
1433 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1434 }
1435 #else
1436 select_timeout.tv_sec = 0;
1437 select_timeout.tv_usec = 50000;
1438 #endif
1439
1440 max_fd = -1;
1441 FD_ZERO(&readfds);
1442 FD_ZERO(&writefds);
1443 FD_ZERO(&excfds);
1444 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1445
1446 /*
1447 * It can happen that curl_multi_timeout returns a pathologically
1448 * long timeout when curl_multi_fdset returns no file descriptors
1449 * to read. See commit message for more details.
1450 */
1451 if (max_fd < 0 &&
1452 (select_timeout.tv_sec > 0 ||
1453 select_timeout.tv_usec > 50000)) {
1454 select_timeout.tv_sec = 0;
1455 select_timeout.tv_usec = 50000;
1456 }
1457
1458 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1459 }
1460 }
1461 #else
1462 while (slot->in_use) {
1463 slot->curl_result = curl_easy_perform(slot->curl);
1464 finish_active_slot(slot);
1465 }
1466 #endif
1467 }
1468
1469 static void release_active_slot(struct active_request_slot *slot)
1470 {
1471 closedown_active_slot(slot);
1472 if (slot->curl) {
1473 xmulti_remove_handle(slot);
1474 if (curl_session_count > min_curl_sessions) {
1475 curl_easy_cleanup(slot->curl);
1476 slot->curl = NULL;
1477 curl_session_count--;
1478 }
1479 }
1480 #ifdef USE_CURL_MULTI
1481 fill_active_slots();
1482 #endif
1483 }
1484
1485 void finish_all_active_slots(void)
1486 {
1487 struct active_request_slot *slot = active_queue_head;
1488
1489 while (slot != NULL)
1490 if (slot->in_use) {
1491 run_active_slot(slot);
1492 slot = active_queue_head;
1493 } else {
1494 slot = slot->next;
1495 }
1496 }
1497
1498 /* Helpers for modifying and creating URLs */
1499 static inline int needs_quote(int ch)
1500 {
1501 if (((ch >= 'A') && (ch <= 'Z'))
1502 || ((ch >= 'a') && (ch <= 'z'))
1503 || ((ch >= '0') && (ch <= '9'))
1504 || (ch == '/')
1505 || (ch == '-')
1506 || (ch == '.'))
1507 return 0;
1508 return 1;
1509 }
1510
1511 static char *quote_ref_url(const char *base, const char *ref)
1512 {
1513 struct strbuf buf = STRBUF_INIT;
1514 const char *cp;
1515 int ch;
1516
1517 end_url_with_slash(&buf, base);
1518
1519 for (cp = ref; (ch = *cp) != 0; cp++)
1520 if (needs_quote(ch))
1521 strbuf_addf(&buf, "%%%02x", ch);
1522 else
1523 strbuf_addch(&buf, *cp);
1524
1525 return strbuf_detach(&buf, NULL);
1526 }
1527
1528 void append_remote_object_url(struct strbuf *buf, const char *url,
1529 const char *hex,
1530 int only_two_digit_prefix)
1531 {
1532 end_url_with_slash(buf, url);
1533
1534 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1535 if (!only_two_digit_prefix)
1536 strbuf_addstr(buf, hex + 2);
1537 }
1538
1539 char *get_remote_object_url(const char *url, const char *hex,
1540 int only_two_digit_prefix)
1541 {
1542 struct strbuf buf = STRBUF_INIT;
1543 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1544 return strbuf_detach(&buf, NULL);
1545 }
1546
1547 static int handle_curl_result(struct slot_results *results)
1548 {
1549 /*
1550 * If we see a failing http code with CURLE_OK, we have turned off
1551 * FAILONERROR (to keep the server's custom error response), and should
1552 * translate the code into failure here.
1553 *
1554 * Likewise, if we see a redirect (30x code), that means we turned off
1555 * redirect-following, and we should treat the result as an error.
1556 */
1557 if (results->curl_result == CURLE_OK &&
1558 results->http_code >= 300) {
1559 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1560 /*
1561 * Normally curl will already have put the "reason phrase"
1562 * from the server into curl_errorstr; unfortunately without
1563 * FAILONERROR it is lost, so we can give only the numeric
1564 * status code.
1565 */
1566 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1567 "The requested URL returned error: %ld",
1568 results->http_code);
1569 }
1570
1571 if (results->curl_result == CURLE_OK) {
1572 credential_approve(&http_auth);
1573 if (proxy_auth.password)
1574 credential_approve(&proxy_auth);
1575 return HTTP_OK;
1576 } else if (missing_target(results))
1577 return HTTP_MISSING_TARGET;
1578 else if (results->http_code == 401) {
1579 if (http_auth.username && http_auth.password) {
1580 credential_reject(&http_auth);
1581 return HTTP_NOAUTH;
1582 } else {
1583 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1584 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1585 if (results->auth_avail) {
1586 http_auth_methods &= results->auth_avail;
1587 http_auth_methods_restricted = 1;
1588 }
1589 #endif
1590 return HTTP_REAUTH;
1591 }
1592 } else {
1593 if (results->http_connectcode == 407)
1594 credential_reject(&proxy_auth);
1595 #if LIBCURL_VERSION_NUM >= 0x070c00
1596 if (!curl_errorstr[0])
1597 strlcpy(curl_errorstr,
1598 curl_easy_strerror(results->curl_result),
1599 sizeof(curl_errorstr));
1600 #endif
1601 return HTTP_ERROR;
1602 }
1603 }
1604
1605 int run_one_slot(struct active_request_slot *slot,
1606 struct slot_results *results)
1607 {
1608 slot->results = results;
1609 if (!start_active_slot(slot)) {
1610 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1611 "failed to start HTTP request");
1612 return HTTP_START_FAILED;
1613 }
1614
1615 run_active_slot(slot);
1616 return handle_curl_result(results);
1617 }
1618
1619 struct curl_slist *http_copy_default_headers(void)
1620 {
1621 struct curl_slist *headers = NULL, *h;
1622
1623 for (h = extra_http_headers; h; h = h->next)
1624 headers = curl_slist_append(headers, h->data);
1625
1626 return headers;
1627 }
1628
1629 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1630 {
1631 char *ptr;
1632 CURLcode ret;
1633
1634 strbuf_reset(buf);
1635 ret = curl_easy_getinfo(curl, info, &ptr);
1636 if (!ret && ptr)
1637 strbuf_addstr(buf, ptr);
1638 return ret;
1639 }
1640
1641 /*
1642 * Check for and extract a content-type parameter. "raw"
1643 * should be positioned at the start of the potential
1644 * parameter, with any whitespace already removed.
1645 *
1646 * "name" is the name of the parameter. The value is appended
1647 * to "out".
1648 */
1649 static int extract_param(const char *raw, const char *name,
1650 struct strbuf *out)
1651 {
1652 size_t len = strlen(name);
1653
1654 if (strncasecmp(raw, name, len))
1655 return -1;
1656 raw += len;
1657
1658 if (*raw != '=')
1659 return -1;
1660 raw++;
1661
1662 while (*raw && !isspace(*raw) && *raw != ';')
1663 strbuf_addch(out, *raw++);
1664 return 0;
1665 }
1666
1667 /*
1668 * Extract a normalized version of the content type, with any
1669 * spaces suppressed, all letters lowercased, and no trailing ";"
1670 * or parameters.
1671 *
1672 * Note that we will silently remove even invalid whitespace. For
1673 * example, "text / plain" is specifically forbidden by RFC 2616,
1674 * but "text/plain" is the only reasonable output, and this keeps
1675 * our code simple.
1676 *
1677 * If the "charset" argument is not NULL, store the value of any
1678 * charset parameter there.
1679 *
1680 * Example:
1681 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1682 * "text / plain" -> "text/plain"
1683 */
1684 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1685 struct strbuf *charset)
1686 {
1687 const char *p;
1688
1689 strbuf_reset(type);
1690 strbuf_grow(type, raw->len);
1691 for (p = raw->buf; *p; p++) {
1692 if (isspace(*p))
1693 continue;
1694 if (*p == ';') {
1695 p++;
1696 break;
1697 }
1698 strbuf_addch(type, tolower(*p));
1699 }
1700
1701 if (!charset)
1702 return;
1703
1704 strbuf_reset(charset);
1705 while (*p) {
1706 while (isspace(*p) || *p == ';')
1707 p++;
1708 if (!extract_param(p, "charset", charset))
1709 return;
1710 while (*p && !isspace(*p))
1711 p++;
1712 }
1713
1714 if (!charset->len && starts_with(type->buf, "text/"))
1715 strbuf_addstr(charset, "ISO-8859-1");
1716 }
1717
1718 static void write_accept_language(struct strbuf *buf)
1719 {
1720 /*
1721 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1722 * that, q-value will be smaller than 0.001, the minimum q-value the
1723 * HTTP specification allows. See
1724 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1725 */
1726 const int MAX_DECIMAL_PLACES = 3;
1727 const int MAX_LANGUAGE_TAGS = 1000;
1728 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1729 char **language_tags = NULL;
1730 int num_langs = 0;
1731 const char *s = get_preferred_languages();
1732 int i;
1733 struct strbuf tag = STRBUF_INIT;
1734
1735 /* Don't add Accept-Language header if no language is preferred. */
1736 if (!s)
1737 return;
1738
1739 /*
1740 * Split the colon-separated string of preferred languages into
1741 * language_tags array.
1742 */
1743 do {
1744 /* collect language tag */
1745 for (; *s && (isalnum(*s) || *s == '_'); s++)
1746 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1747
1748 /* skip .codeset, @modifier and any other unnecessary parts */
1749 while (*s && *s != ':')
1750 s++;
1751
1752 if (tag.len) {
1753 num_langs++;
1754 REALLOC_ARRAY(language_tags, num_langs);
1755 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1756 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1757 break;
1758 }
1759 } while (*s++);
1760
1761 /* write Accept-Language header into buf */
1762 if (num_langs) {
1763 int last_buf_len = 0;
1764 int max_q;
1765 int decimal_places;
1766 char q_format[32];
1767
1768 /* add '*' */
1769 REALLOC_ARRAY(language_tags, num_langs + 1);
1770 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1771
1772 /* compute decimal_places */
1773 for (max_q = 1, decimal_places = 0;
1774 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1775 decimal_places++, max_q *= 10)
1776 ;
1777
1778 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1779
1780 strbuf_addstr(buf, "Accept-Language: ");
1781
1782 for (i = 0; i < num_langs; i++) {
1783 if (i > 0)
1784 strbuf_addstr(buf, ", ");
1785
1786 strbuf_addstr(buf, language_tags[i]);
1787
1788 if (i > 0)
1789 strbuf_addf(buf, q_format, max_q - i);
1790
1791 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1792 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1793 break;
1794 }
1795
1796 last_buf_len = buf->len;
1797 }
1798 }
1799
1800 /* free language tags -- last one is a static '*' */
1801 for (i = 0; i < num_langs - 1; i++)
1802 free(language_tags[i]);
1803 free(language_tags);
1804 }
1805
1806 /*
1807 * Get an Accept-Language header which indicates user's preferred languages.
1808 *
1809 * Examples:
1810 * LANGUAGE= -> ""
1811 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1812 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1813 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1814 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1815 * LANGUAGE= LANG=C -> ""
1816 */
1817 static const char *get_accept_language(void)
1818 {
1819 if (!cached_accept_language) {
1820 struct strbuf buf = STRBUF_INIT;
1821 write_accept_language(&buf);
1822 if (buf.len > 0)
1823 cached_accept_language = strbuf_detach(&buf, NULL);
1824 }
1825
1826 return cached_accept_language;
1827 }
1828
1829 static void http_opt_request_remainder(CURL *curl, off_t pos)
1830 {
1831 char buf[128];
1832 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1833 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1834 }
1835
1836 /* http_request() targets */
1837 #define HTTP_REQUEST_STRBUF 0
1838 #define HTTP_REQUEST_FILE 1
1839
1840 static int http_request(const char *url,
1841 void *result, int target,
1842 const struct http_get_options *options)
1843 {
1844 struct active_request_slot *slot;
1845 struct slot_results results;
1846 struct curl_slist *headers = http_copy_default_headers();
1847 struct strbuf buf = STRBUF_INIT;
1848 const char *accept_language;
1849 int ret;
1850
1851 slot = get_active_slot();
1852 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1853
1854 if (result == NULL) {
1855 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1856 } else {
1857 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1858 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1859
1860 if (target == HTTP_REQUEST_FILE) {
1861 off_t posn = ftello(result);
1862 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1863 fwrite);
1864 if (posn > 0)
1865 http_opt_request_remainder(slot->curl, posn);
1866 } else
1867 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1868 fwrite_buffer);
1869 }
1870
1871 accept_language = get_accept_language();
1872
1873 if (accept_language)
1874 headers = curl_slist_append(headers, accept_language);
1875
1876 strbuf_addstr(&buf, "Pragma:");
1877 if (options && options->no_cache)
1878 strbuf_addstr(&buf, " no-cache");
1879 if (options && options->initial_request &&
1880 http_follow_config == HTTP_FOLLOW_INITIAL)
1881 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1882
1883 headers = curl_slist_append(headers, buf.buf);
1884
1885 /* Add additional headers here */
1886 if (options && options->extra_headers) {
1887 const struct string_list_item *item;
1888 for_each_string_list_item(item, options->extra_headers) {
1889 headers = curl_slist_append(headers, item->string);
1890 }
1891 }
1892
1893 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1894 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1895 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1896 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1897
1898 ret = run_one_slot(slot, &results);
1899
1900 if (options && options->content_type) {
1901 struct strbuf raw = STRBUF_INIT;
1902 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1903 extract_content_type(&raw, options->content_type,
1904 options->charset);
1905 strbuf_release(&raw);
1906 }
1907
1908 if (options && options->effective_url)
1909 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1910 options->effective_url);
1911
1912 curl_slist_free_all(headers);
1913 strbuf_release(&buf);
1914
1915 return ret;
1916 }
1917
1918 /*
1919 * Update the "base" url to a more appropriate value, as deduced by
1920 * redirects seen when requesting a URL starting with "url".
1921 *
1922 * The "asked" parameter is a URL that we asked curl to access, and must begin
1923 * with "base".
1924 *
1925 * The "got" parameter is the URL that curl reported to us as where we ended
1926 * up.
1927 *
1928 * Returns 1 if we updated the base url, 0 otherwise.
1929 *
1930 * Our basic strategy is to compare "base" and "asked" to find the bits
1931 * specific to our request. We then strip those bits off of "got" to yield the
1932 * new base. So for example, if our base is "http://example.com/foo.git",
1933 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1934 * with "https://other.example.com/foo.git/info/refs". We would want the
1935 * new URL to become "https://other.example.com/foo.git".
1936 *
1937 * Note that this assumes a sane redirect scheme. It's entirely possible
1938 * in the example above to end up at a URL that does not even end in
1939 * "info/refs". In such a case we die. There's not much we can do, such a
1940 * scheme is unlikely to represent a real git repository, and failing to
1941 * rewrite the base opens options for malicious redirects to do funny things.
1942 */
1943 static int update_url_from_redirect(struct strbuf *base,
1944 const char *asked,
1945 const struct strbuf *got)
1946 {
1947 const char *tail;
1948 size_t new_len;
1949
1950 if (!strcmp(asked, got->buf))
1951 return 0;
1952
1953 if (!skip_prefix(asked, base->buf, &tail))
1954 BUG("update_url_from_redirect: %s is not a superset of %s",
1955 asked, base->buf);
1956
1957 new_len = got->len;
1958 if (!strip_suffix_mem(got->buf, &new_len, tail))
1959 die(_("unable to update url base from redirection:\n"
1960 " asked for: %s\n"
1961 " redirect: %s"),
1962 asked, got->buf);
1963
1964 strbuf_reset(base);
1965 strbuf_add(base, got->buf, new_len);
1966
1967 return 1;
1968 }
1969
1970 static int http_request_reauth(const char *url,
1971 void *result, int target,
1972 struct http_get_options *options)
1973 {
1974 int ret = http_request(url, result, target, options);
1975
1976 if (ret != HTTP_OK && ret != HTTP_REAUTH)
1977 return ret;
1978
1979 if (options && options->effective_url && options->base_url) {
1980 if (update_url_from_redirect(options->base_url,
1981 url, options->effective_url)) {
1982 credential_from_url(&http_auth, options->base_url->buf);
1983 url = options->effective_url->buf;
1984 }
1985 }
1986
1987 if (ret != HTTP_REAUTH)
1988 return ret;
1989
1990 /*
1991 * The previous request may have put cruft into our output stream; we
1992 * should clear it out before making our next request.
1993 */
1994 switch (target) {
1995 case HTTP_REQUEST_STRBUF:
1996 strbuf_reset(result);
1997 break;
1998 case HTTP_REQUEST_FILE:
1999 if (fflush(result)) {
2000 error_errno("unable to flush a file");
2001 return HTTP_START_FAILED;
2002 }
2003 rewind(result);
2004 if (ftruncate(fileno(result), 0) < 0) {
2005 error_errno("unable to truncate a file");
2006 return HTTP_START_FAILED;
2007 }
2008 break;
2009 default:
2010 BUG("Unknown http_request target");
2011 }
2012
2013 credential_fill(&http_auth);
2014
2015 return http_request(url, result, target, options);
2016 }
2017
2018 int http_get_strbuf(const char *url,
2019 struct strbuf *result,
2020 struct http_get_options *options)
2021 {
2022 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
2023 }
2024
2025 /*
2026 * Downloads a URL and stores the result in the given file.
2027 *
2028 * If a previous interrupted download is detected (i.e. a previous temporary
2029 * file is still around) the download is resumed.
2030 */
2031 static int http_get_file(const char *url, const char *filename,
2032 struct http_get_options *options)
2033 {
2034 int ret;
2035 struct strbuf tmpfile = STRBUF_INIT;
2036 FILE *result;
2037
2038 strbuf_addf(&tmpfile, "%s.temp", filename);
2039 result = fopen(tmpfile.buf, "a");
2040 if (!result) {
2041 error("Unable to open local file %s", tmpfile.buf);
2042 ret = HTTP_ERROR;
2043 goto cleanup;
2044 }
2045
2046 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
2047 fclose(result);
2048
2049 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
2050 ret = HTTP_ERROR;
2051 cleanup:
2052 strbuf_release(&tmpfile);
2053 return ret;
2054 }
2055
2056 int http_fetch_ref(const char *base, struct ref *ref)
2057 {
2058 struct http_get_options options = {0};
2059 char *url;
2060 struct strbuf buffer = STRBUF_INIT;
2061 int ret = -1;
2062
2063 options.no_cache = 1;
2064
2065 url = quote_ref_url(base, ref->name);
2066 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
2067 strbuf_rtrim(&buffer);
2068 if (buffer.len == 40)
2069 ret = get_oid_hex(buffer.buf, &ref->old_oid);
2070 else if (starts_with(buffer.buf, "ref: ")) {
2071 ref->symref = xstrdup(buffer.buf + 5);
2072 ret = 0;
2073 }
2074 }
2075
2076 strbuf_release(&buffer);
2077 free(url);
2078 return ret;
2079 }
2080
2081 /* Helpers for fetching packs */
2082 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
2083 {
2084 char *url, *tmp;
2085 struct strbuf buf = STRBUF_INIT;
2086
2087 if (http_is_verbose)
2088 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
2089
2090 end_url_with_slash(&buf, base_url);
2091 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
2092 url = strbuf_detach(&buf, NULL);
2093
2094 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
2095 tmp = strbuf_detach(&buf, NULL);
2096
2097 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
2098 error("Unable to get pack index %s", url);
2099 FREE_AND_NULL(tmp);
2100 }
2101
2102 free(url);
2103 return tmp;
2104 }
2105
2106 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
2107 unsigned char *sha1, const char *base_url)
2108 {
2109 struct packed_git *new_pack;
2110 char *tmp_idx = NULL;
2111 int ret;
2112
2113 if (has_pack_index(sha1)) {
2114 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
2115 if (!new_pack)
2116 return -1; /* parse_pack_index() already issued error message */
2117 goto add_pack;
2118 }
2119
2120 tmp_idx = fetch_pack_index(sha1, base_url);
2121 if (!tmp_idx)
2122 return -1;
2123
2124 new_pack = parse_pack_index(sha1, tmp_idx);
2125 if (!new_pack) {
2126 unlink(tmp_idx);
2127 free(tmp_idx);
2128
2129 return -1; /* parse_pack_index() already issued error message */
2130 }
2131
2132 ret = verify_pack_index(new_pack);
2133 if (!ret) {
2134 close_pack_index(new_pack);
2135 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
2136 }
2137 free(tmp_idx);
2138 if (ret)
2139 return -1;
2140
2141 add_pack:
2142 new_pack->next = *packs_head;
2143 *packs_head = new_pack;
2144 return 0;
2145 }
2146
2147 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
2148 {
2149 struct http_get_options options = {0};
2150 int ret = 0;
2151 char *url;
2152 const char *data;
2153 struct strbuf buf = STRBUF_INIT;
2154 struct object_id oid;
2155
2156 end_url_with_slash(&buf, base_url);
2157 strbuf_addstr(&buf, "objects/info/packs");
2158 url = strbuf_detach(&buf, NULL);
2159
2160 options.no_cache = 1;
2161 ret = http_get_strbuf(url, &buf, &options);
2162 if (ret != HTTP_OK)
2163 goto cleanup;
2164
2165 data = buf.buf;
2166 while (*data) {
2167 if (skip_prefix(data, "P pack-", &data) &&
2168 !parse_oid_hex(data, &oid, &data) &&
2169 skip_prefix(data, ".pack", &data) &&
2170 (*data == '\n' || *data == '\0')) {
2171 fetch_and_setup_pack_index(packs_head, oid.hash, base_url);
2172 } else {
2173 data = strchrnul(data, '\n');
2174 }
2175 if (*data)
2176 data++; /* skip past newline */
2177 }
2178
2179 cleanup:
2180 free(url);
2181 return ret;
2182 }
2183
2184 void release_http_pack_request(struct http_pack_request *preq)
2185 {
2186 if (preq->packfile != NULL) {
2187 fclose(preq->packfile);
2188 preq->packfile = NULL;
2189 }
2190 preq->slot = NULL;
2191 strbuf_release(&preq->tmpfile);
2192 free(preq->url);
2193 free(preq);
2194 }
2195
2196 int finish_http_pack_request(struct http_pack_request *preq)
2197 {
2198 struct packed_git **lst;
2199 struct packed_git *p = preq->target;
2200 char *tmp_idx;
2201 size_t len;
2202 struct child_process ip = CHILD_PROCESS_INIT;
2203
2204 close_pack_index(p);
2205
2206 fclose(preq->packfile);
2207 preq->packfile = NULL;
2208
2209 lst = preq->lst;
2210 while (*lst != p)
2211 lst = &((*lst)->next);
2212 *lst = (*lst)->next;
2213
2214 if (!strip_suffix(preq->tmpfile.buf, ".pack.temp", &len))
2215 BUG("pack tmpfile does not end in .pack.temp?");
2216 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile.buf);
2217
2218 argv_array_push(&ip.args, "index-pack");
2219 argv_array_pushl(&ip.args, "-o", tmp_idx, NULL);
2220 argv_array_push(&ip.args, preq->tmpfile.buf);
2221 ip.git_cmd = 1;
2222 ip.no_stdin = 1;
2223 ip.no_stdout = 1;
2224
2225 if (run_command(&ip)) {
2226 unlink(preq->tmpfile.buf);
2227 unlink(tmp_idx);
2228 free(tmp_idx);
2229 return -1;
2230 }
2231
2232 unlink(sha1_pack_index_name(p->sha1));
2233
2234 if (finalize_object_file(preq->tmpfile.buf, sha1_pack_name(p->sha1))
2235 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
2236 free(tmp_idx);
2237 return -1;
2238 }
2239
2240 install_packed_git(the_repository, p);
2241 free(tmp_idx);
2242 return 0;
2243 }
2244
2245 struct http_pack_request *new_http_pack_request(
2246 struct packed_git *target, const char *base_url)
2247 {
2248 off_t prev_posn = 0;
2249 struct strbuf buf = STRBUF_INIT;
2250 struct http_pack_request *preq;
2251
2252 preq = xcalloc(1, sizeof(*preq));
2253 strbuf_init(&preq->tmpfile, 0);
2254 preq->target = target;
2255
2256 end_url_with_slash(&buf, base_url);
2257 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2258 sha1_to_hex(target->sha1));
2259 preq->url = strbuf_detach(&buf, NULL);
2260
2261 strbuf_addf(&preq->tmpfile, "%s.temp", sha1_pack_name(target->sha1));
2262 preq->packfile = fopen(preq->tmpfile.buf, "a");
2263 if (!preq->packfile) {
2264 error("Unable to open local file %s for pack",
2265 preq->tmpfile.buf);
2266 goto abort;
2267 }
2268
2269 preq->slot = get_active_slot();
2270 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2271 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2272 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2273 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2274 no_pragma_header);
2275
2276 /*
2277 * If there is data present from a previous transfer attempt,
2278 * resume where it left off
2279 */
2280 prev_posn = ftello(preq->packfile);
2281 if (prev_posn>0) {
2282 if (http_is_verbose)
2283 fprintf(stderr,
2284 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2285 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
2286 http_opt_request_remainder(preq->slot->curl, prev_posn);
2287 }
2288
2289 return preq;
2290
2291 abort:
2292 strbuf_release(&preq->tmpfile);
2293 free(preq->url);
2294 free(preq);
2295 return NULL;
2296 }
2297
2298 /* Helpers for fetching objects (loose) */
2299 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2300 void *data)
2301 {
2302 unsigned char expn[4096];
2303 size_t size = eltsize * nmemb;
2304 int posn = 0;
2305 struct http_object_request *freq = data;
2306 struct active_request_slot *slot = freq->slot;
2307
2308 if (slot) {
2309 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2310 &slot->http_code);
2311 if (c != CURLE_OK)
2312 BUG("curl_easy_getinfo for HTTP code failed: %s",
2313 curl_easy_strerror(c));
2314 if (slot->http_code >= 300)
2315 return size;
2316 }
2317
2318 do {
2319 ssize_t retval = xwrite(freq->localfile,
2320 (char *) ptr + posn, size - posn);
2321 if (retval < 0)
2322 return posn;
2323 posn += retval;
2324 } while (posn < size);
2325
2326 freq->stream.avail_in = size;
2327 freq->stream.next_in = (void *)ptr;
2328 do {
2329 freq->stream.next_out = expn;
2330 freq->stream.avail_out = sizeof(expn);
2331 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2332 git_SHA1_Update(&freq->c, expn,
2333 sizeof(expn) - freq->stream.avail_out);
2334 } while (freq->stream.avail_in && freq->zret == Z_OK);
2335 return size;
2336 }
2337
2338 struct http_object_request *new_http_object_request(const char *base_url,
2339 const struct object_id *oid)
2340 {
2341 char *hex = oid_to_hex(oid);
2342 struct strbuf filename = STRBUF_INIT;
2343 struct strbuf prevfile = STRBUF_INIT;
2344 int prevlocal;
2345 char prev_buf[PREV_BUF_SIZE];
2346 ssize_t prev_read = 0;
2347 off_t prev_posn = 0;
2348 struct http_object_request *freq;
2349
2350 freq = xcalloc(1, sizeof(*freq));
2351 strbuf_init(&freq->tmpfile, 0);
2352 oidcpy(&freq->oid, oid);
2353 freq->localfile = -1;
2354
2355 loose_object_path(the_repository, &filename, oid);
2356 strbuf_addf(&freq->tmpfile, "%s.temp", filename.buf);
2357
2358 strbuf_addf(&prevfile, "%s.prev", filename.buf);
2359 unlink_or_warn(prevfile.buf);
2360 rename(freq->tmpfile.buf, prevfile.buf);
2361 unlink_or_warn(freq->tmpfile.buf);
2362 strbuf_release(&filename);
2363
2364 if (freq->localfile != -1)
2365 error("fd leakage in start: %d", freq->localfile);
2366 freq->localfile = open(freq->tmpfile.buf,
2367 O_WRONLY | O_CREAT | O_EXCL, 0666);
2368 /*
2369 * This could have failed due to the "lazy directory creation";
2370 * try to mkdir the last path component.
2371 */
2372 if (freq->localfile < 0 && errno == ENOENT) {
2373 char *dir = strrchr(freq->tmpfile.buf, '/');
2374 if (dir) {
2375 *dir = 0;
2376 mkdir(freq->tmpfile.buf, 0777);
2377 *dir = '/';
2378 }
2379 freq->localfile = open(freq->tmpfile.buf,
2380 O_WRONLY | O_CREAT | O_EXCL, 0666);
2381 }
2382
2383 if (freq->localfile < 0) {
2384 error_errno("Couldn't create temporary file %s",
2385 freq->tmpfile.buf);
2386 goto abort;
2387 }
2388
2389 git_inflate_init(&freq->stream);
2390
2391 git_SHA1_Init(&freq->c);
2392
2393 freq->url = get_remote_object_url(base_url, hex, 0);
2394
2395 /*
2396 * If a previous temp file is present, process what was already
2397 * fetched.
2398 */
2399 prevlocal = open(prevfile.buf, O_RDONLY);
2400 if (prevlocal != -1) {
2401 do {
2402 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2403 if (prev_read>0) {
2404 if (fwrite_sha1_file(prev_buf,
2405 1,
2406 prev_read,
2407 freq) == prev_read) {
2408 prev_posn += prev_read;
2409 } else {
2410 prev_read = -1;
2411 }
2412 }
2413 } while (prev_read > 0);
2414 close(prevlocal);
2415 }
2416 unlink_or_warn(prevfile.buf);
2417 strbuf_release(&prevfile);
2418
2419 /*
2420 * Reset inflate/SHA1 if there was an error reading the previous temp
2421 * file; also rewind to the beginning of the local file.
2422 */
2423 if (prev_read == -1) {
2424 memset(&freq->stream, 0, sizeof(freq->stream));
2425 git_inflate_init(&freq->stream);
2426 git_SHA1_Init(&freq->c);
2427 if (prev_posn>0) {
2428 prev_posn = 0;
2429 lseek(freq->localfile, 0, SEEK_SET);
2430 if (ftruncate(freq->localfile, 0) < 0) {
2431 error_errno("Couldn't truncate temporary file %s",
2432 freq->tmpfile.buf);
2433 goto abort;
2434 }
2435 }
2436 }
2437
2438 freq->slot = get_active_slot();
2439
2440 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2441 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2442 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2443 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2444 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2445 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2446
2447 /*
2448 * If we have successfully processed data from a previous fetch
2449 * attempt, only fetch the data we don't already have.
2450 */
2451 if (prev_posn>0) {
2452 if (http_is_verbose)
2453 fprintf(stderr,
2454 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2455 hex, (uintmax_t)prev_posn);
2456 http_opt_request_remainder(freq->slot->curl, prev_posn);
2457 }
2458
2459 return freq;
2460
2461 abort:
2462 strbuf_release(&prevfile);
2463 free(freq->url);
2464 free(freq);
2465 return NULL;
2466 }
2467
2468 void process_http_object_request(struct http_object_request *freq)
2469 {
2470 if (freq->slot == NULL)
2471 return;
2472 freq->curl_result = freq->slot->curl_result;
2473 freq->http_code = freq->slot->http_code;
2474 freq->slot = NULL;
2475 }
2476
2477 int finish_http_object_request(struct http_object_request *freq)
2478 {
2479 struct stat st;
2480 struct strbuf filename = STRBUF_INIT;
2481
2482 close(freq->localfile);
2483 freq->localfile = -1;
2484
2485 process_http_object_request(freq);
2486
2487 if (freq->http_code == 416) {
2488 warning("requested range invalid; we may already have all the data.");
2489 } else if (freq->curl_result != CURLE_OK) {
2490 if (stat(freq->tmpfile.buf, &st) == 0)
2491 if (st.st_size == 0)
2492 unlink_or_warn(freq->tmpfile.buf);
2493 return -1;
2494 }
2495
2496 git_inflate_end(&freq->stream);
2497 git_SHA1_Final(freq->real_oid.hash, &freq->c);
2498 if (freq->zret != Z_STREAM_END) {
2499 unlink_or_warn(freq->tmpfile.buf);
2500 return -1;
2501 }
2502 if (!oideq(&freq->oid, &freq->real_oid)) {
2503 unlink_or_warn(freq->tmpfile.buf);
2504 return -1;
2505 }
2506 loose_object_path(the_repository, &filename, &freq->oid);
2507 freq->rename = finalize_object_file(freq->tmpfile.buf, filename.buf);
2508 strbuf_release(&filename);
2509
2510 return freq->rename;
2511 }
2512
2513 void abort_http_object_request(struct http_object_request *freq)
2514 {
2515 unlink_or_warn(freq->tmpfile.buf);
2516
2517 release_http_object_request(freq);
2518 }
2519
2520 void release_http_object_request(struct http_object_request *freq)
2521 {
2522 if (freq->localfile != -1) {
2523 close(freq->localfile);
2524 freq->localfile = -1;
2525 }
2526 FREE_AND_NULL(freq->url);
2527 if (freq->slot != NULL) {
2528 freq->slot->callback_func = NULL;
2529 freq->slot->callback_data = NULL;
2530 release_active_slot(freq->slot);
2531 freq->slot = NULL;
2532 }
2533 strbuf_release(&freq->tmpfile);
2534 }