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http: correct curl version check for CURLOPT_PINNEDPUBLICKEY
[thirdparty/git.git] / http.c
1 #include "git-compat-util.h"
2 #include "http.h"
3 #include "config.h"
4 #include "pack.h"
5 #include "sideband.h"
6 #include "run-command.h"
7 #include "url.h"
8 #include "urlmatch.h"
9 #include "credential.h"
10 #include "version.h"
11 #include "pkt-line.h"
12 #include "gettext.h"
13 #include "transport.h"
14 #include "packfile.h"
15 #include "protocol.h"
16 #include "string-list.h"
17 #include "object-store.h"
18
19 static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
20 static int trace_curl_data = 1;
21 static int trace_curl_redact = 1;
22 long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
23 int active_requests;
24 int http_is_verbose;
25 ssize_t http_post_buffer = 16 * LARGE_PACKET_MAX;
26
27 static int min_curl_sessions = 1;
28 static int curl_session_count;
29 static int max_requests = -1;
30 static CURLM *curlm;
31 static CURL *curl_default;
32
33 #define PREV_BUF_SIZE 4096
34
35 char curl_errorstr[CURL_ERROR_SIZE];
36
37 static int curl_ssl_verify = -1;
38 static int curl_ssl_try;
39 static const char *curl_http_version = NULL;
40 static const char *ssl_cert;
41 static const char *ssl_cipherlist;
42 static const char *ssl_version;
43 static struct {
44 const char *name;
45 long ssl_version;
46 } sslversions[] = {
47 { "sslv2", CURL_SSLVERSION_SSLv2 },
48 { "sslv3", CURL_SSLVERSION_SSLv3 },
49 { "tlsv1", CURL_SSLVERSION_TLSv1 },
50 #if LIBCURL_VERSION_NUM >= 0x072200
51 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
52 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
53 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
54 #endif
55 #if LIBCURL_VERSION_NUM >= 0x073400
56 { "tlsv1.3", CURL_SSLVERSION_TLSv1_3 },
57 #endif
58 };
59 static const char *ssl_key;
60 static const char *ssl_capath;
61 static const char *curl_no_proxy;
62 #if LIBCURL_VERSION_NUM >= 0x072700
63 static const char *ssl_pinnedkey;
64 #endif
65 static const char *ssl_cainfo;
66 static long curl_low_speed_limit = -1;
67 static long curl_low_speed_time = -1;
68 static int curl_ftp_no_epsv;
69 static const char *curl_http_proxy;
70 static const char *http_proxy_authmethod;
71
72 static const char *http_proxy_ssl_cert;
73 static const char *http_proxy_ssl_key;
74 static const char *http_proxy_ssl_ca_info;
75 static struct credential proxy_cert_auth = CREDENTIAL_INIT;
76 static int proxy_ssl_cert_password_required;
77
78 static struct {
79 const char *name;
80 long curlauth_param;
81 } proxy_authmethods[] = {
82 { "basic", CURLAUTH_BASIC },
83 { "digest", CURLAUTH_DIGEST },
84 { "negotiate", CURLAUTH_GSSNEGOTIATE },
85 { "ntlm", CURLAUTH_NTLM },
86 { "anyauth", CURLAUTH_ANY },
87 /*
88 * CURLAUTH_DIGEST_IE has no corresponding command-line option in
89 * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
90 * here, too
91 */
92 };
93 #ifdef CURLGSSAPI_DELEGATION_FLAG
94 static const char *curl_deleg;
95 static struct {
96 const char *name;
97 long curl_deleg_param;
98 } curl_deleg_levels[] = {
99 { "none", CURLGSSAPI_DELEGATION_NONE },
100 { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
101 { "always", CURLGSSAPI_DELEGATION_FLAG },
102 };
103 #endif
104
105 static struct credential proxy_auth = CREDENTIAL_INIT;
106 static const char *curl_proxyuserpwd;
107 static const char *curl_cookie_file;
108 static int curl_save_cookies;
109 struct credential http_auth = CREDENTIAL_INIT;
110 static int http_proactive_auth;
111 static const char *user_agent;
112 static int curl_empty_auth = -1;
113
114 enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
115
116 static struct credential cert_auth = CREDENTIAL_INIT;
117 static int ssl_cert_password_required;
118 static unsigned long http_auth_methods = CURLAUTH_ANY;
119 static int http_auth_methods_restricted;
120 /* Modes for which empty_auth cannot actually help us. */
121 static unsigned long empty_auth_useless =
122 CURLAUTH_BASIC
123 | CURLAUTH_DIGEST_IE
124 | CURLAUTH_DIGEST;
125
126 static struct curl_slist *pragma_header;
127 static struct curl_slist *no_pragma_header;
128 static struct string_list extra_http_headers = STRING_LIST_INIT_DUP;
129
130 static struct active_request_slot *active_queue_head;
131
132 static char *cached_accept_language;
133
134 static char *http_ssl_backend;
135
136 static int http_schannel_check_revoke = 1;
137 /*
138 * With the backend being set to `schannel`, setting sslCAinfo would override
139 * the Certificate Store in cURL v7.60.0 and later, which is not what we want
140 * by default.
141 */
142 static int http_schannel_use_ssl_cainfo;
143
144 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
145 {
146 size_t size = eltsize * nmemb;
147 struct buffer *buffer = buffer_;
148
149 if (size > buffer->buf.len - buffer->posn)
150 size = buffer->buf.len - buffer->posn;
151 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
152 buffer->posn += size;
153
154 return size / eltsize;
155 }
156
157 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
158 {
159 struct buffer *buffer = clientp;
160
161 switch (cmd) {
162 case CURLIOCMD_NOP:
163 return CURLIOE_OK;
164
165 case CURLIOCMD_RESTARTREAD:
166 buffer->posn = 0;
167 return CURLIOE_OK;
168
169 default:
170 return CURLIOE_UNKNOWNCMD;
171 }
172 }
173
174 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
175 {
176 size_t size = eltsize * nmemb;
177 struct strbuf *buffer = buffer_;
178
179 strbuf_add(buffer, ptr, size);
180 return nmemb;
181 }
182
183 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
184 {
185 return nmemb;
186 }
187
188 static void closedown_active_slot(struct active_request_slot *slot)
189 {
190 active_requests--;
191 slot->in_use = 0;
192 }
193
194 static void finish_active_slot(struct active_request_slot *slot)
195 {
196 closedown_active_slot(slot);
197 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
198
199 if (slot->finished != NULL)
200 (*slot->finished) = 1;
201
202 /* Store slot results so they can be read after the slot is reused */
203 if (slot->results != NULL) {
204 slot->results->curl_result = slot->curl_result;
205 slot->results->http_code = slot->http_code;
206 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
207 &slot->results->auth_avail);
208
209 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
210 &slot->results->http_connectcode);
211 }
212
213 /* Run callback if appropriate */
214 if (slot->callback_func != NULL)
215 slot->callback_func(slot->callback_data);
216 }
217
218 static void xmulti_remove_handle(struct active_request_slot *slot)
219 {
220 curl_multi_remove_handle(curlm, slot->curl);
221 }
222
223 static void process_curl_messages(void)
224 {
225 int num_messages;
226 struct active_request_slot *slot;
227 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
228
229 while (curl_message != NULL) {
230 if (curl_message->msg == CURLMSG_DONE) {
231 int curl_result = curl_message->data.result;
232 slot = active_queue_head;
233 while (slot != NULL &&
234 slot->curl != curl_message->easy_handle)
235 slot = slot->next;
236 if (slot != NULL) {
237 xmulti_remove_handle(slot);
238 slot->curl_result = curl_result;
239 finish_active_slot(slot);
240 } else {
241 fprintf(stderr, "Received DONE message for unknown request!\n");
242 }
243 } else {
244 fprintf(stderr, "Unknown CURL message received: %d\n",
245 (int)curl_message->msg);
246 }
247 curl_message = curl_multi_info_read(curlm, &num_messages);
248 }
249 }
250
251 static int http_options(const char *var, const char *value, void *cb)
252 {
253 if (!strcmp("http.version", var)) {
254 return git_config_string(&curl_http_version, var, value);
255 }
256 if (!strcmp("http.sslverify", var)) {
257 curl_ssl_verify = git_config_bool(var, value);
258 return 0;
259 }
260 if (!strcmp("http.sslcipherlist", var))
261 return git_config_string(&ssl_cipherlist, var, value);
262 if (!strcmp("http.sslversion", var))
263 return git_config_string(&ssl_version, var, value);
264 if (!strcmp("http.sslcert", var))
265 return git_config_pathname(&ssl_cert, var, value);
266 if (!strcmp("http.sslkey", var))
267 return git_config_pathname(&ssl_key, var, value);
268 if (!strcmp("http.sslcapath", var))
269 return git_config_pathname(&ssl_capath, var, value);
270 if (!strcmp("http.sslcainfo", var))
271 return git_config_pathname(&ssl_cainfo, var, value);
272 if (!strcmp("http.sslcertpasswordprotected", var)) {
273 ssl_cert_password_required = git_config_bool(var, value);
274 return 0;
275 }
276 if (!strcmp("http.ssltry", var)) {
277 curl_ssl_try = git_config_bool(var, value);
278 return 0;
279 }
280 if (!strcmp("http.sslbackend", var)) {
281 free(http_ssl_backend);
282 http_ssl_backend = xstrdup_or_null(value);
283 return 0;
284 }
285
286 if (!strcmp("http.schannelcheckrevoke", var)) {
287 http_schannel_check_revoke = git_config_bool(var, value);
288 return 0;
289 }
290
291 if (!strcmp("http.schannelusesslcainfo", var)) {
292 http_schannel_use_ssl_cainfo = git_config_bool(var, value);
293 return 0;
294 }
295
296 if (!strcmp("http.minsessions", var)) {
297 min_curl_sessions = git_config_int(var, value);
298 if (min_curl_sessions > 1)
299 min_curl_sessions = 1;
300 return 0;
301 }
302 if (!strcmp("http.maxrequests", var)) {
303 max_requests = git_config_int(var, value);
304 return 0;
305 }
306 if (!strcmp("http.lowspeedlimit", var)) {
307 curl_low_speed_limit = (long)git_config_int(var, value);
308 return 0;
309 }
310 if (!strcmp("http.lowspeedtime", var)) {
311 curl_low_speed_time = (long)git_config_int(var, value);
312 return 0;
313 }
314
315 if (!strcmp("http.noepsv", var)) {
316 curl_ftp_no_epsv = git_config_bool(var, value);
317 return 0;
318 }
319 if (!strcmp("http.proxy", var))
320 return git_config_string(&curl_http_proxy, var, value);
321
322 if (!strcmp("http.proxyauthmethod", var))
323 return git_config_string(&http_proxy_authmethod, var, value);
324
325 if (!strcmp("http.proxysslcert", var))
326 return git_config_string(&http_proxy_ssl_cert, var, value);
327
328 if (!strcmp("http.proxysslkey", var))
329 return git_config_string(&http_proxy_ssl_key, var, value);
330
331 if (!strcmp("http.proxysslcainfo", var))
332 return git_config_string(&http_proxy_ssl_ca_info, var, value);
333
334 if (!strcmp("http.proxysslcertpasswordprotected", var)) {
335 proxy_ssl_cert_password_required = git_config_bool(var, value);
336 return 0;
337 }
338
339 if (!strcmp("http.cookiefile", var))
340 return git_config_pathname(&curl_cookie_file, var, value);
341 if (!strcmp("http.savecookies", var)) {
342 curl_save_cookies = git_config_bool(var, value);
343 return 0;
344 }
345
346 if (!strcmp("http.postbuffer", var)) {
347 http_post_buffer = git_config_ssize_t(var, value);
348 if (http_post_buffer < 0)
349 warning(_("negative value for http.postbuffer; defaulting to %d"), LARGE_PACKET_MAX);
350 if (http_post_buffer < LARGE_PACKET_MAX)
351 http_post_buffer = LARGE_PACKET_MAX;
352 return 0;
353 }
354
355 if (!strcmp("http.useragent", var))
356 return git_config_string(&user_agent, var, value);
357
358 if (!strcmp("http.emptyauth", var)) {
359 if (value && !strcmp("auto", value))
360 curl_empty_auth = -1;
361 else
362 curl_empty_auth = git_config_bool(var, value);
363 return 0;
364 }
365
366 if (!strcmp("http.delegation", var)) {
367 #ifdef CURLGSSAPI_DELEGATION_FLAG
368 return git_config_string(&curl_deleg, var, value);
369 #else
370 warning(_("Delegation control is not supported with cURL < 7.22.0"));
371 return 0;
372 #endif
373 }
374
375 if (!strcmp("http.pinnedpubkey", var)) {
376 #if LIBCURL_VERSION_NUM >= 0x072700
377 return git_config_pathname(&ssl_pinnedkey, var, value);
378 #else
379 warning(_("Public key pinning not supported with cURL < 7.39.0"));
380 return 0;
381 #endif
382 }
383
384 if (!strcmp("http.extraheader", var)) {
385 if (!value) {
386 return config_error_nonbool(var);
387 } else if (!*value) {
388 string_list_clear(&extra_http_headers, 0);
389 } else {
390 string_list_append(&extra_http_headers, value);
391 }
392 return 0;
393 }
394
395 if (!strcmp("http.followredirects", var)) {
396 if (value && !strcmp(value, "initial"))
397 http_follow_config = HTTP_FOLLOW_INITIAL;
398 else if (git_config_bool(var, value))
399 http_follow_config = HTTP_FOLLOW_ALWAYS;
400 else
401 http_follow_config = HTTP_FOLLOW_NONE;
402 return 0;
403 }
404
405 /* Fall back on the default ones */
406 return git_default_config(var, value, cb);
407 }
408
409 static int curl_empty_auth_enabled(void)
410 {
411 if (curl_empty_auth >= 0)
412 return curl_empty_auth;
413
414 /*
415 * In the automatic case, kick in the empty-auth
416 * hack as long as we would potentially try some
417 * method more exotic than "Basic" or "Digest".
418 *
419 * But only do this when this is our second or
420 * subsequent request, as by then we know what
421 * methods are available.
422 */
423 if (http_auth_methods_restricted &&
424 (http_auth_methods & ~empty_auth_useless))
425 return 1;
426 return 0;
427 }
428
429 static void init_curl_http_auth(CURL *result)
430 {
431 if (!http_auth.username || !*http_auth.username) {
432 if (curl_empty_auth_enabled())
433 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
434 return;
435 }
436
437 credential_fill(&http_auth);
438
439 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
440 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
441 }
442
443 /* *var must be free-able */
444 static void var_override(const char **var, char *value)
445 {
446 if (value) {
447 free((void *)*var);
448 *var = xstrdup(value);
449 }
450 }
451
452 static void set_proxyauth_name_password(CURL *result)
453 {
454 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
455 proxy_auth.username);
456 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
457 proxy_auth.password);
458 }
459
460 static void init_curl_proxy_auth(CURL *result)
461 {
462 if (proxy_auth.username) {
463 if (!proxy_auth.password)
464 credential_fill(&proxy_auth);
465 set_proxyauth_name_password(result);
466 }
467
468 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
469
470 if (http_proxy_authmethod) {
471 int i;
472 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
473 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
474 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
475 proxy_authmethods[i].curlauth_param);
476 break;
477 }
478 }
479 if (i == ARRAY_SIZE(proxy_authmethods)) {
480 warning("unsupported proxy authentication method %s: using anyauth",
481 http_proxy_authmethod);
482 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
483 }
484 }
485 else
486 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
487 }
488
489 static int has_cert_password(void)
490 {
491 if (ssl_cert == NULL || ssl_cert_password_required != 1)
492 return 0;
493 if (!cert_auth.password) {
494 cert_auth.protocol = xstrdup("cert");
495 cert_auth.host = xstrdup("");
496 cert_auth.username = xstrdup("");
497 cert_auth.path = xstrdup(ssl_cert);
498 credential_fill(&cert_auth);
499 }
500 return 1;
501 }
502
503 #if LIBCURL_VERSION_NUM >= 0x073400
504 static int has_proxy_cert_password(void)
505 {
506 if (http_proxy_ssl_cert == NULL || proxy_ssl_cert_password_required != 1)
507 return 0;
508 if (!proxy_cert_auth.password) {
509 proxy_cert_auth.protocol = xstrdup("cert");
510 proxy_cert_auth.host = xstrdup("");
511 proxy_cert_auth.username = xstrdup("");
512 proxy_cert_auth.path = xstrdup(http_proxy_ssl_cert);
513 credential_fill(&proxy_cert_auth);
514 }
515 return 1;
516 }
517 #endif
518
519 #if LIBCURL_VERSION_NUM >= 0x071900
520 static void set_curl_keepalive(CURL *c)
521 {
522 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
523 }
524
525 #else
526 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
527 {
528 int ka = 1;
529 int rc;
530 socklen_t len = (socklen_t)sizeof(ka);
531
532 if (type != CURLSOCKTYPE_IPCXN)
533 return 0;
534
535 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
536 if (rc < 0)
537 warning_errno("unable to set SO_KEEPALIVE on socket");
538
539 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
540 }
541
542 static void set_curl_keepalive(CURL *c)
543 {
544 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
545 }
546 #endif
547
548 static void redact_sensitive_header(struct strbuf *header)
549 {
550 const char *sensitive_header;
551
552 if (trace_curl_redact &&
553 (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
554 skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header))) {
555 /* The first token is the type, which is OK to log */
556 while (isspace(*sensitive_header))
557 sensitive_header++;
558 while (*sensitive_header && !isspace(*sensitive_header))
559 sensitive_header++;
560 /* Everything else is opaque and possibly sensitive */
561 strbuf_setlen(header, sensitive_header - header->buf);
562 strbuf_addstr(header, " <redacted>");
563 } else if (trace_curl_redact &&
564 skip_prefix(header->buf, "Cookie:", &sensitive_header)) {
565 struct strbuf redacted_header = STRBUF_INIT;
566 const char *cookie;
567
568 while (isspace(*sensitive_header))
569 sensitive_header++;
570
571 cookie = sensitive_header;
572
573 while (cookie) {
574 char *equals;
575 char *semicolon = strstr(cookie, "; ");
576 if (semicolon)
577 *semicolon = 0;
578 equals = strchrnul(cookie, '=');
579 if (!equals) {
580 /* invalid cookie, just append and continue */
581 strbuf_addstr(&redacted_header, cookie);
582 continue;
583 }
584 strbuf_add(&redacted_header, cookie, equals - cookie);
585 strbuf_addstr(&redacted_header, "=<redacted>");
586 if (semicolon) {
587 /*
588 * There are more cookies. (Or, for some
589 * reason, the input string ends in "; ".)
590 */
591 strbuf_addstr(&redacted_header, "; ");
592 cookie = semicolon + strlen("; ");
593 } else {
594 cookie = NULL;
595 }
596 }
597
598 strbuf_setlen(header, sensitive_header - header->buf);
599 strbuf_addbuf(header, &redacted_header);
600 }
601 }
602
603 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
604 {
605 struct strbuf out = STRBUF_INIT;
606 struct strbuf **headers, **header;
607
608 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
609 text, (long)size, (long)size);
610 trace_strbuf(&trace_curl, &out);
611 strbuf_reset(&out);
612 strbuf_add(&out, ptr, size);
613 headers = strbuf_split_max(&out, '\n', 0);
614
615 for (header = headers; *header; header++) {
616 if (hide_sensitive_header)
617 redact_sensitive_header(*header);
618 strbuf_insertstr((*header), 0, text);
619 strbuf_insertstr((*header), strlen(text), ": ");
620 strbuf_rtrim((*header));
621 strbuf_addch((*header), '\n');
622 trace_strbuf(&trace_curl, (*header));
623 }
624 strbuf_list_free(headers);
625 strbuf_release(&out);
626 }
627
628 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
629 {
630 size_t i;
631 struct strbuf out = STRBUF_INIT;
632 unsigned int width = 60;
633
634 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
635 text, (long)size, (long)size);
636 trace_strbuf(&trace_curl, &out);
637
638 for (i = 0; i < size; i += width) {
639 size_t w;
640
641 strbuf_reset(&out);
642 strbuf_addf(&out, "%s: ", text);
643 for (w = 0; (w < width) && (i + w < size); w++) {
644 unsigned char ch = ptr[i + w];
645
646 strbuf_addch(&out,
647 (ch >= 0x20) && (ch < 0x80)
648 ? ch : '.');
649 }
650 strbuf_addch(&out, '\n');
651 trace_strbuf(&trace_curl, &out);
652 }
653 strbuf_release(&out);
654 }
655
656 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
657 {
658 const char *text;
659 enum { NO_FILTER = 0, DO_FILTER = 1 };
660
661 switch (type) {
662 case CURLINFO_TEXT:
663 trace_printf_key(&trace_curl, "== Info: %s", data);
664 break;
665 case CURLINFO_HEADER_OUT:
666 text = "=> Send header";
667 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
668 break;
669 case CURLINFO_DATA_OUT:
670 if (trace_curl_data) {
671 text = "=> Send data";
672 curl_dump_data(text, (unsigned char *)data, size);
673 }
674 break;
675 case CURLINFO_SSL_DATA_OUT:
676 if (trace_curl_data) {
677 text = "=> Send SSL data";
678 curl_dump_data(text, (unsigned char *)data, size);
679 }
680 break;
681 case CURLINFO_HEADER_IN:
682 text = "<= Recv header";
683 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
684 break;
685 case CURLINFO_DATA_IN:
686 if (trace_curl_data) {
687 text = "<= Recv data";
688 curl_dump_data(text, (unsigned char *)data, size);
689 }
690 break;
691 case CURLINFO_SSL_DATA_IN:
692 if (trace_curl_data) {
693 text = "<= Recv SSL data";
694 curl_dump_data(text, (unsigned char *)data, size);
695 }
696 break;
697
698 default: /* we ignore unknown types by default */
699 return 0;
700 }
701 return 0;
702 }
703
704 void http_trace_curl_no_data(void)
705 {
706 trace_override_envvar(&trace_curl, "1");
707 trace_curl_data = 0;
708 }
709
710 void setup_curl_trace(CURL *handle)
711 {
712 if (!trace_want(&trace_curl))
713 return;
714 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
715 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
716 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
717 }
718
719 static long get_curl_allowed_protocols(int from_user)
720 {
721 long allowed_protocols = 0;
722
723 if (is_transport_allowed("http", from_user))
724 allowed_protocols |= CURLPROTO_HTTP;
725 if (is_transport_allowed("https", from_user))
726 allowed_protocols |= CURLPROTO_HTTPS;
727 if (is_transport_allowed("ftp", from_user))
728 allowed_protocols |= CURLPROTO_FTP;
729 if (is_transport_allowed("ftps", from_user))
730 allowed_protocols |= CURLPROTO_FTPS;
731
732 return allowed_protocols;
733 }
734
735 #if LIBCURL_VERSION_NUM >=0x072b00
736 static int get_curl_http_version_opt(const char *version_string, long *opt)
737 {
738 int i;
739 static struct {
740 const char *name;
741 long opt_token;
742 } choice[] = {
743 { "HTTP/1.1", CURL_HTTP_VERSION_1_1 },
744 { "HTTP/2", CURL_HTTP_VERSION_2 }
745 };
746
747 for (i = 0; i < ARRAY_SIZE(choice); i++) {
748 if (!strcmp(version_string, choice[i].name)) {
749 *opt = choice[i].opt_token;
750 return 0;
751 }
752 }
753
754 warning("unknown value given to http.version: '%s'", version_string);
755 return -1; /* not found */
756 }
757
758 #endif
759
760 static CURL *get_curl_handle(void)
761 {
762 CURL *result = curl_easy_init();
763
764 if (!result)
765 die("curl_easy_init failed");
766
767 if (!curl_ssl_verify) {
768 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
769 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
770 } else {
771 /* Verify authenticity of the peer's certificate */
772 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
773 /* The name in the cert must match whom we tried to connect */
774 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
775 }
776
777 #if LIBCURL_VERSION_NUM >= 0x072b00
778 if (curl_http_version) {
779 long opt;
780 if (!get_curl_http_version_opt(curl_http_version, &opt)) {
781 /* Set request use http version */
782 curl_easy_setopt(result, CURLOPT_HTTP_VERSION, opt);
783 }
784 }
785 #endif
786
787 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
788 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
789
790 #ifdef CURLGSSAPI_DELEGATION_FLAG
791 if (curl_deleg) {
792 int i;
793 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
794 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
795 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
796 curl_deleg_levels[i].curl_deleg_param);
797 break;
798 }
799 }
800 if (i == ARRAY_SIZE(curl_deleg_levels))
801 warning("Unknown delegation method '%s': using default",
802 curl_deleg);
803 }
804 #endif
805
806 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
807 !http_schannel_check_revoke) {
808 #if LIBCURL_VERSION_NUM >= 0x072c00
809 curl_easy_setopt(result, CURLOPT_SSL_OPTIONS, CURLSSLOPT_NO_REVOKE);
810 #else
811 warning(_("CURLSSLOPT_NO_REVOKE not supported with cURL < 7.44.0"));
812 #endif
813 }
814
815 if (http_proactive_auth)
816 init_curl_http_auth(result);
817
818 if (getenv("GIT_SSL_VERSION"))
819 ssl_version = getenv("GIT_SSL_VERSION");
820 if (ssl_version && *ssl_version) {
821 int i;
822 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
823 if (!strcmp(ssl_version, sslversions[i].name)) {
824 curl_easy_setopt(result, CURLOPT_SSLVERSION,
825 sslversions[i].ssl_version);
826 break;
827 }
828 }
829 if (i == ARRAY_SIZE(sslversions))
830 warning("unsupported ssl version %s: using default",
831 ssl_version);
832 }
833
834 if (getenv("GIT_SSL_CIPHER_LIST"))
835 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
836 if (ssl_cipherlist != NULL && *ssl_cipherlist)
837 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
838 ssl_cipherlist);
839
840 if (ssl_cert != NULL)
841 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
842 if (has_cert_password())
843 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
844 if (ssl_key != NULL)
845 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
846 if (ssl_capath != NULL)
847 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
848 #if LIBCURL_VERSION_NUM >= 0x072700
849 if (ssl_pinnedkey != NULL)
850 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
851 #endif
852 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
853 !http_schannel_use_ssl_cainfo) {
854 curl_easy_setopt(result, CURLOPT_CAINFO, NULL);
855 #if LIBCURL_VERSION_NUM >= 0x073400
856 curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, NULL);
857 #endif
858 } else if (ssl_cainfo != NULL || http_proxy_ssl_ca_info != NULL) {
859 if (ssl_cainfo != NULL)
860 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
861 #if LIBCURL_VERSION_NUM >= 0x073400
862 if (http_proxy_ssl_ca_info != NULL)
863 curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, http_proxy_ssl_ca_info);
864 #endif
865 }
866
867 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
868 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
869 curl_low_speed_limit);
870 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
871 curl_low_speed_time);
872 }
873
874 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
875 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
876 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
877 get_curl_allowed_protocols(0));
878 curl_easy_setopt(result, CURLOPT_PROTOCOLS,
879 get_curl_allowed_protocols(-1));
880 if (getenv("GIT_CURL_VERBOSE"))
881 http_trace_curl_no_data();
882 setup_curl_trace(result);
883 if (getenv("GIT_TRACE_CURL_NO_DATA"))
884 trace_curl_data = 0;
885 if (!git_env_bool("GIT_TRACE_REDACT", 1))
886 trace_curl_redact = 0;
887
888 curl_easy_setopt(result, CURLOPT_USERAGENT,
889 user_agent ? user_agent : git_user_agent());
890
891 if (curl_ftp_no_epsv)
892 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
893
894 if (curl_ssl_try)
895 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
896
897 /*
898 * CURL also examines these variables as a fallback; but we need to query
899 * them here in order to decide whether to prompt for missing password (cf.
900 * init_curl_proxy_auth()).
901 *
902 * Unlike many other common environment variables, these are historically
903 * lowercase only. It appears that CURL did not know this and implemented
904 * only uppercase variants, which was later corrected to take both - with
905 * the exception of http_proxy, which is lowercase only also in CURL. As
906 * the lowercase versions are the historical quasi-standard, they take
907 * precedence here, as in CURL.
908 */
909 if (!curl_http_proxy) {
910 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
911 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
912 var_override(&curl_http_proxy, getenv("https_proxy"));
913 } else {
914 var_override(&curl_http_proxy, getenv("http_proxy"));
915 }
916 if (!curl_http_proxy) {
917 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
918 var_override(&curl_http_proxy, getenv("all_proxy"));
919 }
920 }
921
922 if (curl_http_proxy && curl_http_proxy[0] == '\0') {
923 /*
924 * Handle case with the empty http.proxy value here to keep
925 * common code clean.
926 * NB: empty option disables proxying at all.
927 */
928 curl_easy_setopt(result, CURLOPT_PROXY, "");
929 } else if (curl_http_proxy) {
930 if (starts_with(curl_http_proxy, "socks5h"))
931 curl_easy_setopt(result,
932 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
933 else if (starts_with(curl_http_proxy, "socks5"))
934 curl_easy_setopt(result,
935 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
936 else if (starts_with(curl_http_proxy, "socks4a"))
937 curl_easy_setopt(result,
938 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
939 else if (starts_with(curl_http_proxy, "socks"))
940 curl_easy_setopt(result,
941 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
942 #if LIBCURL_VERSION_NUM >= 0x073400
943 else if (starts_with(curl_http_proxy, "https")) {
944 curl_easy_setopt(result, CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
945
946 if (http_proxy_ssl_cert)
947 curl_easy_setopt(result, CURLOPT_PROXY_SSLCERT, http_proxy_ssl_cert);
948
949 if (http_proxy_ssl_key)
950 curl_easy_setopt(result, CURLOPT_PROXY_SSLKEY, http_proxy_ssl_key);
951
952 if (has_proxy_cert_password())
953 curl_easy_setopt(result, CURLOPT_PROXY_KEYPASSWD, proxy_cert_auth.password);
954 }
955 #endif
956 if (strstr(curl_http_proxy, "://"))
957 credential_from_url(&proxy_auth, curl_http_proxy);
958 else {
959 struct strbuf url = STRBUF_INIT;
960 strbuf_addf(&url, "http://%s", curl_http_proxy);
961 credential_from_url(&proxy_auth, url.buf);
962 strbuf_release(&url);
963 }
964
965 if (!proxy_auth.host)
966 die("Invalid proxy URL '%s'", curl_http_proxy);
967
968 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
969 var_override(&curl_no_proxy, getenv("NO_PROXY"));
970 var_override(&curl_no_proxy, getenv("no_proxy"));
971 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
972 }
973 init_curl_proxy_auth(result);
974
975 set_curl_keepalive(result);
976
977 return result;
978 }
979
980 static void set_from_env(const char **var, const char *envname)
981 {
982 const char *val = getenv(envname);
983 if (val)
984 *var = val;
985 }
986
987 void http_init(struct remote *remote, const char *url, int proactive_auth)
988 {
989 char *low_speed_limit;
990 char *low_speed_time;
991 char *normalized_url;
992 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
993
994 config.section = "http";
995 config.key = NULL;
996 config.collect_fn = http_options;
997 config.cascade_fn = git_default_config;
998 config.cb = NULL;
999
1000 http_is_verbose = 0;
1001 normalized_url = url_normalize(url, &config.url);
1002
1003 git_config(urlmatch_config_entry, &config);
1004 free(normalized_url);
1005 string_list_clear(&config.vars, 1);
1006
1007 #if LIBCURL_VERSION_NUM >= 0x073800
1008 if (http_ssl_backend) {
1009 const curl_ssl_backend **backends;
1010 struct strbuf buf = STRBUF_INIT;
1011 int i;
1012
1013 switch (curl_global_sslset(-1, http_ssl_backend, &backends)) {
1014 case CURLSSLSET_UNKNOWN_BACKEND:
1015 strbuf_addf(&buf, _("Unsupported SSL backend '%s'. "
1016 "Supported SSL backends:"),
1017 http_ssl_backend);
1018 for (i = 0; backends[i]; i++)
1019 strbuf_addf(&buf, "\n\t%s", backends[i]->name);
1020 die("%s", buf.buf);
1021 case CURLSSLSET_NO_BACKENDS:
1022 die(_("Could not set SSL backend to '%s': "
1023 "cURL was built without SSL backends"),
1024 http_ssl_backend);
1025 case CURLSSLSET_TOO_LATE:
1026 die(_("Could not set SSL backend to '%s': already set"),
1027 http_ssl_backend);
1028 case CURLSSLSET_OK:
1029 break; /* Okay! */
1030 }
1031 }
1032 #endif
1033
1034 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1035 die("curl_global_init failed");
1036
1037 http_proactive_auth = proactive_auth;
1038
1039 if (remote && remote->http_proxy)
1040 curl_http_proxy = xstrdup(remote->http_proxy);
1041
1042 if (remote)
1043 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
1044
1045 pragma_header = curl_slist_append(http_copy_default_headers(),
1046 "Pragma: no-cache");
1047 no_pragma_header = curl_slist_append(http_copy_default_headers(),
1048 "Pragma:");
1049
1050 {
1051 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1052 if (http_max_requests != NULL)
1053 max_requests = atoi(http_max_requests);
1054 }
1055
1056 curlm = curl_multi_init();
1057 if (!curlm)
1058 die("curl_multi_init failed");
1059
1060 if (getenv("GIT_SSL_NO_VERIFY"))
1061 curl_ssl_verify = 0;
1062
1063 set_from_env(&ssl_cert, "GIT_SSL_CERT");
1064 set_from_env(&ssl_key, "GIT_SSL_KEY");
1065 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
1066 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
1067
1068 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
1069
1070 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1071 if (low_speed_limit != NULL)
1072 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1073 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1074 if (low_speed_time != NULL)
1075 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1076
1077 if (curl_ssl_verify == -1)
1078 curl_ssl_verify = 1;
1079
1080 curl_session_count = 0;
1081 if (max_requests < 1)
1082 max_requests = DEFAULT_MAX_REQUESTS;
1083
1084 set_from_env(&http_proxy_ssl_cert, "GIT_PROXY_SSL_CERT");
1085 set_from_env(&http_proxy_ssl_key, "GIT_PROXY_SSL_KEY");
1086 set_from_env(&http_proxy_ssl_ca_info, "GIT_PROXY_SSL_CAINFO");
1087
1088 if (getenv("GIT_PROXY_SSL_CERT_PASSWORD_PROTECTED"))
1089 proxy_ssl_cert_password_required = 1;
1090
1091 if (getenv("GIT_CURL_FTP_NO_EPSV"))
1092 curl_ftp_no_epsv = 1;
1093
1094 if (url) {
1095 credential_from_url(&http_auth, url);
1096 if (!ssl_cert_password_required &&
1097 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1098 starts_with(url, "https://"))
1099 ssl_cert_password_required = 1;
1100 }
1101
1102 curl_default = get_curl_handle();
1103 }
1104
1105 void http_cleanup(void)
1106 {
1107 struct active_request_slot *slot = active_queue_head;
1108
1109 while (slot != NULL) {
1110 struct active_request_slot *next = slot->next;
1111 if (slot->curl != NULL) {
1112 xmulti_remove_handle(slot);
1113 curl_easy_cleanup(slot->curl);
1114 }
1115 free(slot);
1116 slot = next;
1117 }
1118 active_queue_head = NULL;
1119
1120 curl_easy_cleanup(curl_default);
1121
1122 curl_multi_cleanup(curlm);
1123 curl_global_cleanup();
1124
1125 string_list_clear(&extra_http_headers, 0);
1126
1127 curl_slist_free_all(pragma_header);
1128 pragma_header = NULL;
1129
1130 curl_slist_free_all(no_pragma_header);
1131 no_pragma_header = NULL;
1132
1133 if (curl_http_proxy) {
1134 free((void *)curl_http_proxy);
1135 curl_http_proxy = NULL;
1136 }
1137
1138 if (proxy_auth.password) {
1139 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1140 FREE_AND_NULL(proxy_auth.password);
1141 }
1142
1143 free((void *)curl_proxyuserpwd);
1144 curl_proxyuserpwd = NULL;
1145
1146 free((void *)http_proxy_authmethod);
1147 http_proxy_authmethod = NULL;
1148
1149 if (cert_auth.password != NULL) {
1150 memset(cert_auth.password, 0, strlen(cert_auth.password));
1151 FREE_AND_NULL(cert_auth.password);
1152 }
1153 ssl_cert_password_required = 0;
1154
1155 if (proxy_cert_auth.password != NULL) {
1156 memset(proxy_cert_auth.password, 0, strlen(proxy_cert_auth.password));
1157 FREE_AND_NULL(proxy_cert_auth.password);
1158 }
1159 proxy_ssl_cert_password_required = 0;
1160
1161 FREE_AND_NULL(cached_accept_language);
1162 }
1163
1164 struct active_request_slot *get_active_slot(void)
1165 {
1166 struct active_request_slot *slot = active_queue_head;
1167 struct active_request_slot *newslot;
1168
1169 int num_transfers;
1170
1171 /* Wait for a slot to open up if the queue is full */
1172 while (active_requests >= max_requests) {
1173 curl_multi_perform(curlm, &num_transfers);
1174 if (num_transfers < active_requests)
1175 process_curl_messages();
1176 }
1177
1178 while (slot != NULL && slot->in_use)
1179 slot = slot->next;
1180
1181 if (slot == NULL) {
1182 newslot = xmalloc(sizeof(*newslot));
1183 newslot->curl = NULL;
1184 newslot->in_use = 0;
1185 newslot->next = NULL;
1186
1187 slot = active_queue_head;
1188 if (slot == NULL) {
1189 active_queue_head = newslot;
1190 } else {
1191 while (slot->next != NULL)
1192 slot = slot->next;
1193 slot->next = newslot;
1194 }
1195 slot = newslot;
1196 }
1197
1198 if (slot->curl == NULL) {
1199 slot->curl = curl_easy_duphandle(curl_default);
1200 curl_session_count++;
1201 }
1202
1203 active_requests++;
1204 slot->in_use = 1;
1205 slot->results = NULL;
1206 slot->finished = NULL;
1207 slot->callback_data = NULL;
1208 slot->callback_func = NULL;
1209 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1210 if (curl_save_cookies)
1211 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1212 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1213 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1214 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1215 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1216 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1217 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1218 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1219 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1220 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1221 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1222
1223 /*
1224 * Default following to off unless "ALWAYS" is configured; this gives
1225 * callers a sane starting point, and they can tweak for individual
1226 * HTTP_FOLLOW_* cases themselves.
1227 */
1228 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1229 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1230 else
1231 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1232
1233 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1234 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1235 if (http_auth.password || curl_empty_auth_enabled())
1236 init_curl_http_auth(slot->curl);
1237
1238 return slot;
1239 }
1240
1241 int start_active_slot(struct active_request_slot *slot)
1242 {
1243 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1244 int num_transfers;
1245
1246 if (curlm_result != CURLM_OK &&
1247 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1248 warning("curl_multi_add_handle failed: %s",
1249 curl_multi_strerror(curlm_result));
1250 active_requests--;
1251 slot->in_use = 0;
1252 return 0;
1253 }
1254
1255 /*
1256 * We know there must be something to do, since we just added
1257 * something.
1258 */
1259 curl_multi_perform(curlm, &num_transfers);
1260 return 1;
1261 }
1262
1263 struct fill_chain {
1264 void *data;
1265 int (*fill)(void *);
1266 struct fill_chain *next;
1267 };
1268
1269 static struct fill_chain *fill_cfg;
1270
1271 void add_fill_function(void *data, int (*fill)(void *))
1272 {
1273 struct fill_chain *new_fill = xmalloc(sizeof(*new_fill));
1274 struct fill_chain **linkp = &fill_cfg;
1275 new_fill->data = data;
1276 new_fill->fill = fill;
1277 new_fill->next = NULL;
1278 while (*linkp)
1279 linkp = &(*linkp)->next;
1280 *linkp = new_fill;
1281 }
1282
1283 void fill_active_slots(void)
1284 {
1285 struct active_request_slot *slot = active_queue_head;
1286
1287 while (active_requests < max_requests) {
1288 struct fill_chain *fill;
1289 for (fill = fill_cfg; fill; fill = fill->next)
1290 if (fill->fill(fill->data))
1291 break;
1292
1293 if (!fill)
1294 break;
1295 }
1296
1297 while (slot != NULL) {
1298 if (!slot->in_use && slot->curl != NULL
1299 && curl_session_count > min_curl_sessions) {
1300 curl_easy_cleanup(slot->curl);
1301 slot->curl = NULL;
1302 curl_session_count--;
1303 }
1304 slot = slot->next;
1305 }
1306 }
1307
1308 void step_active_slots(void)
1309 {
1310 int num_transfers;
1311 CURLMcode curlm_result;
1312
1313 do {
1314 curlm_result = curl_multi_perform(curlm, &num_transfers);
1315 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1316 if (num_transfers < active_requests) {
1317 process_curl_messages();
1318 fill_active_slots();
1319 }
1320 }
1321
1322 void run_active_slot(struct active_request_slot *slot)
1323 {
1324 fd_set readfds;
1325 fd_set writefds;
1326 fd_set excfds;
1327 int max_fd;
1328 struct timeval select_timeout;
1329 int finished = 0;
1330
1331 slot->finished = &finished;
1332 while (!finished) {
1333 step_active_slots();
1334
1335 if (slot->in_use) {
1336 long curl_timeout;
1337 curl_multi_timeout(curlm, &curl_timeout);
1338 if (curl_timeout == 0) {
1339 continue;
1340 } else if (curl_timeout == -1) {
1341 select_timeout.tv_sec = 0;
1342 select_timeout.tv_usec = 50000;
1343 } else {
1344 select_timeout.tv_sec = curl_timeout / 1000;
1345 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1346 }
1347
1348 max_fd = -1;
1349 FD_ZERO(&readfds);
1350 FD_ZERO(&writefds);
1351 FD_ZERO(&excfds);
1352 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1353
1354 /*
1355 * It can happen that curl_multi_timeout returns a pathologically
1356 * long timeout when curl_multi_fdset returns no file descriptors
1357 * to read. See commit message for more details.
1358 */
1359 if (max_fd < 0 &&
1360 (select_timeout.tv_sec > 0 ||
1361 select_timeout.tv_usec > 50000)) {
1362 select_timeout.tv_sec = 0;
1363 select_timeout.tv_usec = 50000;
1364 }
1365
1366 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1367 }
1368 }
1369 }
1370
1371 static void release_active_slot(struct active_request_slot *slot)
1372 {
1373 closedown_active_slot(slot);
1374 if (slot->curl) {
1375 xmulti_remove_handle(slot);
1376 if (curl_session_count > min_curl_sessions) {
1377 curl_easy_cleanup(slot->curl);
1378 slot->curl = NULL;
1379 curl_session_count--;
1380 }
1381 }
1382 fill_active_slots();
1383 }
1384
1385 void finish_all_active_slots(void)
1386 {
1387 struct active_request_slot *slot = active_queue_head;
1388
1389 while (slot != NULL)
1390 if (slot->in_use) {
1391 run_active_slot(slot);
1392 slot = active_queue_head;
1393 } else {
1394 slot = slot->next;
1395 }
1396 }
1397
1398 /* Helpers for modifying and creating URLs */
1399 static inline int needs_quote(int ch)
1400 {
1401 if (((ch >= 'A') && (ch <= 'Z'))
1402 || ((ch >= 'a') && (ch <= 'z'))
1403 || ((ch >= '0') && (ch <= '9'))
1404 || (ch == '/')
1405 || (ch == '-')
1406 || (ch == '.'))
1407 return 0;
1408 return 1;
1409 }
1410
1411 static char *quote_ref_url(const char *base, const char *ref)
1412 {
1413 struct strbuf buf = STRBUF_INIT;
1414 const char *cp;
1415 int ch;
1416
1417 end_url_with_slash(&buf, base);
1418
1419 for (cp = ref; (ch = *cp) != 0; cp++)
1420 if (needs_quote(ch))
1421 strbuf_addf(&buf, "%%%02x", ch);
1422 else
1423 strbuf_addch(&buf, *cp);
1424
1425 return strbuf_detach(&buf, NULL);
1426 }
1427
1428 void append_remote_object_url(struct strbuf *buf, const char *url,
1429 const char *hex,
1430 int only_two_digit_prefix)
1431 {
1432 end_url_with_slash(buf, url);
1433
1434 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1435 if (!only_two_digit_prefix)
1436 strbuf_addstr(buf, hex + 2);
1437 }
1438
1439 char *get_remote_object_url(const char *url, const char *hex,
1440 int only_two_digit_prefix)
1441 {
1442 struct strbuf buf = STRBUF_INIT;
1443 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1444 return strbuf_detach(&buf, NULL);
1445 }
1446
1447 void normalize_curl_result(CURLcode *result, long http_code,
1448 char *errorstr, size_t errorlen)
1449 {
1450 /*
1451 * If we see a failing http code with CURLE_OK, we have turned off
1452 * FAILONERROR (to keep the server's custom error response), and should
1453 * translate the code into failure here.
1454 *
1455 * Likewise, if we see a redirect (30x code), that means we turned off
1456 * redirect-following, and we should treat the result as an error.
1457 */
1458 if (*result == CURLE_OK && http_code >= 300) {
1459 *result = CURLE_HTTP_RETURNED_ERROR;
1460 /*
1461 * Normally curl will already have put the "reason phrase"
1462 * from the server into curl_errorstr; unfortunately without
1463 * FAILONERROR it is lost, so we can give only the numeric
1464 * status code.
1465 */
1466 xsnprintf(errorstr, errorlen,
1467 "The requested URL returned error: %ld",
1468 http_code);
1469 }
1470 }
1471
1472 static int handle_curl_result(struct slot_results *results)
1473 {
1474 normalize_curl_result(&results->curl_result, results->http_code,
1475 curl_errorstr, sizeof(curl_errorstr));
1476
1477 if (results->curl_result == CURLE_OK) {
1478 credential_approve(&http_auth);
1479 credential_approve(&proxy_auth);
1480 credential_approve(&cert_auth);
1481 return HTTP_OK;
1482 } else if (results->curl_result == CURLE_SSL_CERTPROBLEM) {
1483 /*
1484 * We can't tell from here whether it's a bad path, bad
1485 * certificate, bad password, or something else wrong
1486 * with the certificate. So we reject the credential to
1487 * avoid caching or saving a bad password.
1488 */
1489 credential_reject(&cert_auth);
1490 return HTTP_NOAUTH;
1491 } else if (missing_target(results))
1492 return HTTP_MISSING_TARGET;
1493 else if (results->http_code == 401) {
1494 if (http_auth.username && http_auth.password) {
1495 credential_reject(&http_auth);
1496 return HTTP_NOAUTH;
1497 } else {
1498 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1499 if (results->auth_avail) {
1500 http_auth_methods &= results->auth_avail;
1501 http_auth_methods_restricted = 1;
1502 }
1503 return HTTP_REAUTH;
1504 }
1505 } else {
1506 if (results->http_connectcode == 407)
1507 credential_reject(&proxy_auth);
1508 if (!curl_errorstr[0])
1509 strlcpy(curl_errorstr,
1510 curl_easy_strerror(results->curl_result),
1511 sizeof(curl_errorstr));
1512 return HTTP_ERROR;
1513 }
1514 }
1515
1516 int run_one_slot(struct active_request_slot *slot,
1517 struct slot_results *results)
1518 {
1519 slot->results = results;
1520 if (!start_active_slot(slot)) {
1521 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1522 "failed to start HTTP request");
1523 return HTTP_START_FAILED;
1524 }
1525
1526 run_active_slot(slot);
1527 return handle_curl_result(results);
1528 }
1529
1530 struct curl_slist *http_copy_default_headers(void)
1531 {
1532 struct curl_slist *headers = NULL;
1533 const struct string_list_item *item;
1534
1535 for_each_string_list_item(item, &extra_http_headers)
1536 headers = curl_slist_append(headers, item->string);
1537
1538 return headers;
1539 }
1540
1541 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1542 {
1543 char *ptr;
1544 CURLcode ret;
1545
1546 strbuf_reset(buf);
1547 ret = curl_easy_getinfo(curl, info, &ptr);
1548 if (!ret && ptr)
1549 strbuf_addstr(buf, ptr);
1550 return ret;
1551 }
1552
1553 /*
1554 * Check for and extract a content-type parameter. "raw"
1555 * should be positioned at the start of the potential
1556 * parameter, with any whitespace already removed.
1557 *
1558 * "name" is the name of the parameter. The value is appended
1559 * to "out".
1560 */
1561 static int extract_param(const char *raw, const char *name,
1562 struct strbuf *out)
1563 {
1564 size_t len = strlen(name);
1565
1566 if (strncasecmp(raw, name, len))
1567 return -1;
1568 raw += len;
1569
1570 if (*raw != '=')
1571 return -1;
1572 raw++;
1573
1574 while (*raw && !isspace(*raw) && *raw != ';')
1575 strbuf_addch(out, *raw++);
1576 return 0;
1577 }
1578
1579 /*
1580 * Extract a normalized version of the content type, with any
1581 * spaces suppressed, all letters lowercased, and no trailing ";"
1582 * or parameters.
1583 *
1584 * Note that we will silently remove even invalid whitespace. For
1585 * example, "text / plain" is specifically forbidden by RFC 2616,
1586 * but "text/plain" is the only reasonable output, and this keeps
1587 * our code simple.
1588 *
1589 * If the "charset" argument is not NULL, store the value of any
1590 * charset parameter there.
1591 *
1592 * Example:
1593 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1594 * "text / plain" -> "text/plain"
1595 */
1596 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1597 struct strbuf *charset)
1598 {
1599 const char *p;
1600
1601 strbuf_reset(type);
1602 strbuf_grow(type, raw->len);
1603 for (p = raw->buf; *p; p++) {
1604 if (isspace(*p))
1605 continue;
1606 if (*p == ';') {
1607 p++;
1608 break;
1609 }
1610 strbuf_addch(type, tolower(*p));
1611 }
1612
1613 if (!charset)
1614 return;
1615
1616 strbuf_reset(charset);
1617 while (*p) {
1618 while (isspace(*p) || *p == ';')
1619 p++;
1620 if (!extract_param(p, "charset", charset))
1621 return;
1622 while (*p && !isspace(*p))
1623 p++;
1624 }
1625
1626 if (!charset->len && starts_with(type->buf, "text/"))
1627 strbuf_addstr(charset, "ISO-8859-1");
1628 }
1629
1630 static void write_accept_language(struct strbuf *buf)
1631 {
1632 /*
1633 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1634 * that, q-value will be smaller than 0.001, the minimum q-value the
1635 * HTTP specification allows. See
1636 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1637 */
1638 const int MAX_DECIMAL_PLACES = 3;
1639 const int MAX_LANGUAGE_TAGS = 1000;
1640 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1641 char **language_tags = NULL;
1642 int num_langs = 0;
1643 const char *s = get_preferred_languages();
1644 int i;
1645 struct strbuf tag = STRBUF_INIT;
1646
1647 /* Don't add Accept-Language header if no language is preferred. */
1648 if (!s)
1649 return;
1650
1651 /*
1652 * Split the colon-separated string of preferred languages into
1653 * language_tags array.
1654 */
1655 do {
1656 /* collect language tag */
1657 for (; *s && (isalnum(*s) || *s == '_'); s++)
1658 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1659
1660 /* skip .codeset, @modifier and any other unnecessary parts */
1661 while (*s && *s != ':')
1662 s++;
1663
1664 if (tag.len) {
1665 num_langs++;
1666 REALLOC_ARRAY(language_tags, num_langs);
1667 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1668 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1669 break;
1670 }
1671 } while (*s++);
1672
1673 /* write Accept-Language header into buf */
1674 if (num_langs) {
1675 int last_buf_len = 0;
1676 int max_q;
1677 int decimal_places;
1678 char q_format[32];
1679
1680 /* add '*' */
1681 REALLOC_ARRAY(language_tags, num_langs + 1);
1682 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1683
1684 /* compute decimal_places */
1685 for (max_q = 1, decimal_places = 0;
1686 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1687 decimal_places++, max_q *= 10)
1688 ;
1689
1690 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1691
1692 strbuf_addstr(buf, "Accept-Language: ");
1693
1694 for (i = 0; i < num_langs; i++) {
1695 if (i > 0)
1696 strbuf_addstr(buf, ", ");
1697
1698 strbuf_addstr(buf, language_tags[i]);
1699
1700 if (i > 0)
1701 strbuf_addf(buf, q_format, max_q - i);
1702
1703 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1704 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1705 break;
1706 }
1707
1708 last_buf_len = buf->len;
1709 }
1710 }
1711
1712 /* free language tags -- last one is a static '*' */
1713 for (i = 0; i < num_langs - 1; i++)
1714 free(language_tags[i]);
1715 free(language_tags);
1716 }
1717
1718 /*
1719 * Get an Accept-Language header which indicates user's preferred languages.
1720 *
1721 * Examples:
1722 * LANGUAGE= -> ""
1723 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1724 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1725 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1726 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1727 * LANGUAGE= LANG=C -> ""
1728 */
1729 static const char *get_accept_language(void)
1730 {
1731 if (!cached_accept_language) {
1732 struct strbuf buf = STRBUF_INIT;
1733 write_accept_language(&buf);
1734 if (buf.len > 0)
1735 cached_accept_language = strbuf_detach(&buf, NULL);
1736 }
1737
1738 return cached_accept_language;
1739 }
1740
1741 static void http_opt_request_remainder(CURL *curl, off_t pos)
1742 {
1743 char buf[128];
1744 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1745 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1746 }
1747
1748 /* http_request() targets */
1749 #define HTTP_REQUEST_STRBUF 0
1750 #define HTTP_REQUEST_FILE 1
1751
1752 static int http_request(const char *url,
1753 void *result, int target,
1754 const struct http_get_options *options)
1755 {
1756 struct active_request_slot *slot;
1757 struct slot_results results;
1758 struct curl_slist *headers = http_copy_default_headers();
1759 struct strbuf buf = STRBUF_INIT;
1760 const char *accept_language;
1761 int ret;
1762
1763 slot = get_active_slot();
1764 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1765
1766 if (result == NULL) {
1767 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1768 } else {
1769 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1770 curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, result);
1771
1772 if (target == HTTP_REQUEST_FILE) {
1773 off_t posn = ftello(result);
1774 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1775 fwrite);
1776 if (posn > 0)
1777 http_opt_request_remainder(slot->curl, posn);
1778 } else
1779 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1780 fwrite_buffer);
1781 }
1782
1783 accept_language = get_accept_language();
1784
1785 if (accept_language)
1786 headers = curl_slist_append(headers, accept_language);
1787
1788 strbuf_addstr(&buf, "Pragma:");
1789 if (options && options->no_cache)
1790 strbuf_addstr(&buf, " no-cache");
1791 if (options && options->initial_request &&
1792 http_follow_config == HTTP_FOLLOW_INITIAL)
1793 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1794
1795 headers = curl_slist_append(headers, buf.buf);
1796
1797 /* Add additional headers here */
1798 if (options && options->extra_headers) {
1799 const struct string_list_item *item;
1800 for_each_string_list_item(item, options->extra_headers) {
1801 headers = curl_slist_append(headers, item->string);
1802 }
1803 }
1804
1805 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1806 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1807 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1808 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1809
1810 ret = run_one_slot(slot, &results);
1811
1812 if (options && options->content_type) {
1813 struct strbuf raw = STRBUF_INIT;
1814 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1815 extract_content_type(&raw, options->content_type,
1816 options->charset);
1817 strbuf_release(&raw);
1818 }
1819
1820 if (options && options->effective_url)
1821 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1822 options->effective_url);
1823
1824 curl_slist_free_all(headers);
1825 strbuf_release(&buf);
1826
1827 return ret;
1828 }
1829
1830 /*
1831 * Update the "base" url to a more appropriate value, as deduced by
1832 * redirects seen when requesting a URL starting with "url".
1833 *
1834 * The "asked" parameter is a URL that we asked curl to access, and must begin
1835 * with "base".
1836 *
1837 * The "got" parameter is the URL that curl reported to us as where we ended
1838 * up.
1839 *
1840 * Returns 1 if we updated the base url, 0 otherwise.
1841 *
1842 * Our basic strategy is to compare "base" and "asked" to find the bits
1843 * specific to our request. We then strip those bits off of "got" to yield the
1844 * new base. So for example, if our base is "http://example.com/foo.git",
1845 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1846 * with "https://other.example.com/foo.git/info/refs". We would want the
1847 * new URL to become "https://other.example.com/foo.git".
1848 *
1849 * Note that this assumes a sane redirect scheme. It's entirely possible
1850 * in the example above to end up at a URL that does not even end in
1851 * "info/refs". In such a case we die. There's not much we can do, such a
1852 * scheme is unlikely to represent a real git repository, and failing to
1853 * rewrite the base opens options for malicious redirects to do funny things.
1854 */
1855 static int update_url_from_redirect(struct strbuf *base,
1856 const char *asked,
1857 const struct strbuf *got)
1858 {
1859 const char *tail;
1860 size_t new_len;
1861
1862 if (!strcmp(asked, got->buf))
1863 return 0;
1864
1865 if (!skip_prefix(asked, base->buf, &tail))
1866 BUG("update_url_from_redirect: %s is not a superset of %s",
1867 asked, base->buf);
1868
1869 new_len = got->len;
1870 if (!strip_suffix_mem(got->buf, &new_len, tail))
1871 die(_("unable to update url base from redirection:\n"
1872 " asked for: %s\n"
1873 " redirect: %s"),
1874 asked, got->buf);
1875
1876 strbuf_reset(base);
1877 strbuf_add(base, got->buf, new_len);
1878
1879 return 1;
1880 }
1881
1882 static int http_request_reauth(const char *url,
1883 void *result, int target,
1884 struct http_get_options *options)
1885 {
1886 int ret = http_request(url, result, target, options);
1887
1888 if (ret != HTTP_OK && ret != HTTP_REAUTH)
1889 return ret;
1890
1891 if (options && options->effective_url && options->base_url) {
1892 if (update_url_from_redirect(options->base_url,
1893 url, options->effective_url)) {
1894 credential_from_url(&http_auth, options->base_url->buf);
1895 url = options->effective_url->buf;
1896 }
1897 }
1898
1899 if (ret != HTTP_REAUTH)
1900 return ret;
1901
1902 /*
1903 * The previous request may have put cruft into our output stream; we
1904 * should clear it out before making our next request.
1905 */
1906 switch (target) {
1907 case HTTP_REQUEST_STRBUF:
1908 strbuf_reset(result);
1909 break;
1910 case HTTP_REQUEST_FILE:
1911 if (fflush(result)) {
1912 error_errno("unable to flush a file");
1913 return HTTP_START_FAILED;
1914 }
1915 rewind(result);
1916 if (ftruncate(fileno(result), 0) < 0) {
1917 error_errno("unable to truncate a file");
1918 return HTTP_START_FAILED;
1919 }
1920 break;
1921 default:
1922 BUG("Unknown http_request target");
1923 }
1924
1925 credential_fill(&http_auth);
1926
1927 return http_request(url, result, target, options);
1928 }
1929
1930 int http_get_strbuf(const char *url,
1931 struct strbuf *result,
1932 struct http_get_options *options)
1933 {
1934 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1935 }
1936
1937 /*
1938 * Downloads a URL and stores the result in the given file.
1939 *
1940 * If a previous interrupted download is detected (i.e. a previous temporary
1941 * file is still around) the download is resumed.
1942 */
1943 static int http_get_file(const char *url, const char *filename,
1944 struct http_get_options *options)
1945 {
1946 int ret;
1947 struct strbuf tmpfile = STRBUF_INIT;
1948 FILE *result;
1949
1950 strbuf_addf(&tmpfile, "%s.temp", filename);
1951 result = fopen(tmpfile.buf, "a");
1952 if (!result) {
1953 error("Unable to open local file %s", tmpfile.buf);
1954 ret = HTTP_ERROR;
1955 goto cleanup;
1956 }
1957
1958 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1959 fclose(result);
1960
1961 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1962 ret = HTTP_ERROR;
1963 cleanup:
1964 strbuf_release(&tmpfile);
1965 return ret;
1966 }
1967
1968 int http_fetch_ref(const char *base, struct ref *ref)
1969 {
1970 struct http_get_options options = {0};
1971 char *url;
1972 struct strbuf buffer = STRBUF_INIT;
1973 int ret = -1;
1974
1975 options.no_cache = 1;
1976
1977 url = quote_ref_url(base, ref->name);
1978 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1979 strbuf_rtrim(&buffer);
1980 if (buffer.len == the_hash_algo->hexsz)
1981 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1982 else if (starts_with(buffer.buf, "ref: ")) {
1983 ref->symref = xstrdup(buffer.buf + 5);
1984 ret = 0;
1985 }
1986 }
1987
1988 strbuf_release(&buffer);
1989 free(url);
1990 return ret;
1991 }
1992
1993 /* Helpers for fetching packs */
1994 static char *fetch_pack_index(unsigned char *hash, const char *base_url)
1995 {
1996 char *url, *tmp;
1997 struct strbuf buf = STRBUF_INIT;
1998
1999 if (http_is_verbose)
2000 fprintf(stderr, "Getting index for pack %s\n", hash_to_hex(hash));
2001
2002 end_url_with_slash(&buf, base_url);
2003 strbuf_addf(&buf, "objects/pack/pack-%s.idx", hash_to_hex(hash));
2004 url = strbuf_detach(&buf, NULL);
2005
2006 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(hash));
2007 tmp = strbuf_detach(&buf, NULL);
2008
2009 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
2010 error("Unable to get pack index %s", url);
2011 FREE_AND_NULL(tmp);
2012 }
2013
2014 free(url);
2015 return tmp;
2016 }
2017
2018 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
2019 unsigned char *sha1, const char *base_url)
2020 {
2021 struct packed_git *new_pack;
2022 char *tmp_idx = NULL;
2023 int ret;
2024
2025 if (has_pack_index(sha1)) {
2026 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
2027 if (!new_pack)
2028 return -1; /* parse_pack_index() already issued error message */
2029 goto add_pack;
2030 }
2031
2032 tmp_idx = fetch_pack_index(sha1, base_url);
2033 if (!tmp_idx)
2034 return -1;
2035
2036 new_pack = parse_pack_index(sha1, tmp_idx);
2037 if (!new_pack) {
2038 unlink(tmp_idx);
2039 free(tmp_idx);
2040
2041 return -1; /* parse_pack_index() already issued error message */
2042 }
2043
2044 ret = verify_pack_index(new_pack);
2045 if (!ret) {
2046 close_pack_index(new_pack);
2047 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
2048 }
2049 free(tmp_idx);
2050 if (ret)
2051 return -1;
2052
2053 add_pack:
2054 new_pack->next = *packs_head;
2055 *packs_head = new_pack;
2056 return 0;
2057 }
2058
2059 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
2060 {
2061 struct http_get_options options = {0};
2062 int ret = 0;
2063 char *url;
2064 const char *data;
2065 struct strbuf buf = STRBUF_INIT;
2066 struct object_id oid;
2067
2068 end_url_with_slash(&buf, base_url);
2069 strbuf_addstr(&buf, "objects/info/packs");
2070 url = strbuf_detach(&buf, NULL);
2071
2072 options.no_cache = 1;
2073 ret = http_get_strbuf(url, &buf, &options);
2074 if (ret != HTTP_OK)
2075 goto cleanup;
2076
2077 data = buf.buf;
2078 while (*data) {
2079 if (skip_prefix(data, "P pack-", &data) &&
2080 !parse_oid_hex(data, &oid, &data) &&
2081 skip_prefix(data, ".pack", &data) &&
2082 (*data == '\n' || *data == '\0')) {
2083 fetch_and_setup_pack_index(packs_head, oid.hash, base_url);
2084 } else {
2085 data = strchrnul(data, '\n');
2086 }
2087 if (*data)
2088 data++; /* skip past newline */
2089 }
2090
2091 cleanup:
2092 free(url);
2093 return ret;
2094 }
2095
2096 void release_http_pack_request(struct http_pack_request *preq)
2097 {
2098 if (preq->packfile != NULL) {
2099 fclose(preq->packfile);
2100 preq->packfile = NULL;
2101 }
2102 preq->slot = NULL;
2103 strbuf_release(&preq->tmpfile);
2104 free(preq->url);
2105 free(preq);
2106 }
2107
2108 static const char *default_index_pack_args[] =
2109 {"index-pack", "--stdin", NULL};
2110
2111 int finish_http_pack_request(struct http_pack_request *preq)
2112 {
2113 struct child_process ip = CHILD_PROCESS_INIT;
2114 int tmpfile_fd;
2115 int ret = 0;
2116
2117 fclose(preq->packfile);
2118 preq->packfile = NULL;
2119
2120 tmpfile_fd = xopen(preq->tmpfile.buf, O_RDONLY);
2121
2122 ip.git_cmd = 1;
2123 ip.in = tmpfile_fd;
2124 ip.argv = preq->index_pack_args ? preq->index_pack_args
2125 : default_index_pack_args;
2126
2127 if (preq->preserve_index_pack_stdout)
2128 ip.out = 0;
2129 else
2130 ip.no_stdout = 1;
2131
2132 if (run_command(&ip)) {
2133 ret = -1;
2134 goto cleanup;
2135 }
2136
2137 cleanup:
2138 close(tmpfile_fd);
2139 unlink(preq->tmpfile.buf);
2140 return ret;
2141 }
2142
2143 void http_install_packfile(struct packed_git *p,
2144 struct packed_git **list_to_remove_from)
2145 {
2146 struct packed_git **lst = list_to_remove_from;
2147
2148 while (*lst != p)
2149 lst = &((*lst)->next);
2150 *lst = (*lst)->next;
2151
2152 install_packed_git(the_repository, p);
2153 }
2154
2155 struct http_pack_request *new_http_pack_request(
2156 const unsigned char *packed_git_hash, const char *base_url) {
2157
2158 struct strbuf buf = STRBUF_INIT;
2159
2160 end_url_with_slash(&buf, base_url);
2161 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2162 hash_to_hex(packed_git_hash));
2163 return new_direct_http_pack_request(packed_git_hash,
2164 strbuf_detach(&buf, NULL));
2165 }
2166
2167 struct http_pack_request *new_direct_http_pack_request(
2168 const unsigned char *packed_git_hash, char *url)
2169 {
2170 off_t prev_posn = 0;
2171 struct http_pack_request *preq;
2172
2173 CALLOC_ARRAY(preq, 1);
2174 strbuf_init(&preq->tmpfile, 0);
2175
2176 preq->url = url;
2177
2178 strbuf_addf(&preq->tmpfile, "%s.temp", sha1_pack_name(packed_git_hash));
2179 preq->packfile = fopen(preq->tmpfile.buf, "a");
2180 if (!preq->packfile) {
2181 error("Unable to open local file %s for pack",
2182 preq->tmpfile.buf);
2183 goto abort;
2184 }
2185
2186 preq->slot = get_active_slot();
2187 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEDATA, preq->packfile);
2188 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2189 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2190 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2191 no_pragma_header);
2192
2193 /*
2194 * If there is data present from a previous transfer attempt,
2195 * resume where it left off
2196 */
2197 prev_posn = ftello(preq->packfile);
2198 if (prev_posn>0) {
2199 if (http_is_verbose)
2200 fprintf(stderr,
2201 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2202 hash_to_hex(packed_git_hash),
2203 (uintmax_t)prev_posn);
2204 http_opt_request_remainder(preq->slot->curl, prev_posn);
2205 }
2206
2207 return preq;
2208
2209 abort:
2210 strbuf_release(&preq->tmpfile);
2211 free(preq->url);
2212 free(preq);
2213 return NULL;
2214 }
2215
2216 /* Helpers for fetching objects (loose) */
2217 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2218 void *data)
2219 {
2220 unsigned char expn[4096];
2221 size_t size = eltsize * nmemb;
2222 int posn = 0;
2223 struct http_object_request *freq = data;
2224 struct active_request_slot *slot = freq->slot;
2225
2226 if (slot) {
2227 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2228 &slot->http_code);
2229 if (c != CURLE_OK)
2230 BUG("curl_easy_getinfo for HTTP code failed: %s",
2231 curl_easy_strerror(c));
2232 if (slot->http_code >= 300)
2233 return nmemb;
2234 }
2235
2236 do {
2237 ssize_t retval = xwrite(freq->localfile,
2238 (char *) ptr + posn, size - posn);
2239 if (retval < 0)
2240 return posn / eltsize;
2241 posn += retval;
2242 } while (posn < size);
2243
2244 freq->stream.avail_in = size;
2245 freq->stream.next_in = (void *)ptr;
2246 do {
2247 freq->stream.next_out = expn;
2248 freq->stream.avail_out = sizeof(expn);
2249 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2250 the_hash_algo->update_fn(&freq->c, expn,
2251 sizeof(expn) - freq->stream.avail_out);
2252 } while (freq->stream.avail_in && freq->zret == Z_OK);
2253 return nmemb;
2254 }
2255
2256 struct http_object_request *new_http_object_request(const char *base_url,
2257 const struct object_id *oid)
2258 {
2259 char *hex = oid_to_hex(oid);
2260 struct strbuf filename = STRBUF_INIT;
2261 struct strbuf prevfile = STRBUF_INIT;
2262 int prevlocal;
2263 char prev_buf[PREV_BUF_SIZE];
2264 ssize_t prev_read = 0;
2265 off_t prev_posn = 0;
2266 struct http_object_request *freq;
2267
2268 CALLOC_ARRAY(freq, 1);
2269 strbuf_init(&freq->tmpfile, 0);
2270 oidcpy(&freq->oid, oid);
2271 freq->localfile = -1;
2272
2273 loose_object_path(the_repository, &filename, oid);
2274 strbuf_addf(&freq->tmpfile, "%s.temp", filename.buf);
2275
2276 strbuf_addf(&prevfile, "%s.prev", filename.buf);
2277 unlink_or_warn(prevfile.buf);
2278 rename(freq->tmpfile.buf, prevfile.buf);
2279 unlink_or_warn(freq->tmpfile.buf);
2280 strbuf_release(&filename);
2281
2282 if (freq->localfile != -1)
2283 error("fd leakage in start: %d", freq->localfile);
2284 freq->localfile = open(freq->tmpfile.buf,
2285 O_WRONLY | O_CREAT | O_EXCL, 0666);
2286 /*
2287 * This could have failed due to the "lazy directory creation";
2288 * try to mkdir the last path component.
2289 */
2290 if (freq->localfile < 0 && errno == ENOENT) {
2291 char *dir = strrchr(freq->tmpfile.buf, '/');
2292 if (dir) {
2293 *dir = 0;
2294 mkdir(freq->tmpfile.buf, 0777);
2295 *dir = '/';
2296 }
2297 freq->localfile = open(freq->tmpfile.buf,
2298 O_WRONLY | O_CREAT | O_EXCL, 0666);
2299 }
2300
2301 if (freq->localfile < 0) {
2302 error_errno("Couldn't create temporary file %s",
2303 freq->tmpfile.buf);
2304 goto abort;
2305 }
2306
2307 git_inflate_init(&freq->stream);
2308
2309 the_hash_algo->init_fn(&freq->c);
2310
2311 freq->url = get_remote_object_url(base_url, hex, 0);
2312
2313 /*
2314 * If a previous temp file is present, process what was already
2315 * fetched.
2316 */
2317 prevlocal = open(prevfile.buf, O_RDONLY);
2318 if (prevlocal != -1) {
2319 do {
2320 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2321 if (prev_read>0) {
2322 if (fwrite_sha1_file(prev_buf,
2323 1,
2324 prev_read,
2325 freq) == prev_read) {
2326 prev_posn += prev_read;
2327 } else {
2328 prev_read = -1;
2329 }
2330 }
2331 } while (prev_read > 0);
2332 close(prevlocal);
2333 }
2334 unlink_or_warn(prevfile.buf);
2335 strbuf_release(&prevfile);
2336
2337 /*
2338 * Reset inflate/SHA1 if there was an error reading the previous temp
2339 * file; also rewind to the beginning of the local file.
2340 */
2341 if (prev_read == -1) {
2342 memset(&freq->stream, 0, sizeof(freq->stream));
2343 git_inflate_init(&freq->stream);
2344 the_hash_algo->init_fn(&freq->c);
2345 if (prev_posn>0) {
2346 prev_posn = 0;
2347 lseek(freq->localfile, 0, SEEK_SET);
2348 if (ftruncate(freq->localfile, 0) < 0) {
2349 error_errno("Couldn't truncate temporary file %s",
2350 freq->tmpfile.buf);
2351 goto abort;
2352 }
2353 }
2354 }
2355
2356 freq->slot = get_active_slot();
2357
2358 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEDATA, freq);
2359 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2360 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2361 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2362 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2363 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2364
2365 /*
2366 * If we have successfully processed data from a previous fetch
2367 * attempt, only fetch the data we don't already have.
2368 */
2369 if (prev_posn>0) {
2370 if (http_is_verbose)
2371 fprintf(stderr,
2372 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2373 hex, (uintmax_t)prev_posn);
2374 http_opt_request_remainder(freq->slot->curl, prev_posn);
2375 }
2376
2377 return freq;
2378
2379 abort:
2380 strbuf_release(&prevfile);
2381 free(freq->url);
2382 free(freq);
2383 return NULL;
2384 }
2385
2386 void process_http_object_request(struct http_object_request *freq)
2387 {
2388 if (freq->slot == NULL)
2389 return;
2390 freq->curl_result = freq->slot->curl_result;
2391 freq->http_code = freq->slot->http_code;
2392 freq->slot = NULL;
2393 }
2394
2395 int finish_http_object_request(struct http_object_request *freq)
2396 {
2397 struct stat st;
2398 struct strbuf filename = STRBUF_INIT;
2399
2400 close(freq->localfile);
2401 freq->localfile = -1;
2402
2403 process_http_object_request(freq);
2404
2405 if (freq->http_code == 416) {
2406 warning("requested range invalid; we may already have all the data.");
2407 } else if (freq->curl_result != CURLE_OK) {
2408 if (stat(freq->tmpfile.buf, &st) == 0)
2409 if (st.st_size == 0)
2410 unlink_or_warn(freq->tmpfile.buf);
2411 return -1;
2412 }
2413
2414 git_inflate_end(&freq->stream);
2415 the_hash_algo->final_oid_fn(&freq->real_oid, &freq->c);
2416 if (freq->zret != Z_STREAM_END) {
2417 unlink_or_warn(freq->tmpfile.buf);
2418 return -1;
2419 }
2420 if (!oideq(&freq->oid, &freq->real_oid)) {
2421 unlink_or_warn(freq->tmpfile.buf);
2422 return -1;
2423 }
2424 loose_object_path(the_repository, &filename, &freq->oid);
2425 freq->rename = finalize_object_file(freq->tmpfile.buf, filename.buf);
2426 strbuf_release(&filename);
2427
2428 return freq->rename;
2429 }
2430
2431 void abort_http_object_request(struct http_object_request *freq)
2432 {
2433 unlink_or_warn(freq->tmpfile.buf);
2434
2435 release_http_object_request(freq);
2436 }
2437
2438 void release_http_object_request(struct http_object_request *freq)
2439 {
2440 if (freq->localfile != -1) {
2441 close(freq->localfile);
2442 freq->localfile = -1;
2443 }
2444 FREE_AND_NULL(freq->url);
2445 if (freq->slot != NULL) {
2446 freq->slot->callback_func = NULL;
2447 freq->slot->callback_data = NULL;
2448 release_active_slot(freq->slot);
2449 freq->slot = NULL;
2450 }
2451 strbuf_release(&freq->tmpfile);
2452 }
Unnamed repository; edit this file 'description' to name the repository.