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t1600-index: don't run git commands upstream of a pipe
[git/debian.git] / http.c
bloba0f169d2fe535643617aa10fa2e92a65d6b04ab0
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 >= 0x072c00
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 >= 0x072c00
377 return git_config_pathname(&ssl_pinnedkey, var, value);
378 #else
379 warning(_("Public key pinning not supported with cURL < 7.44.0"));
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 >=0x072f00
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 >= 0x072f00 // 7.47.0
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 >= 0x072c00
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 LIBCURL_VERSION_NUM >= 0x071800
931 if (starts_with(curl_http_proxy, "socks5h"))
932 curl_easy_setopt(result,
933 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
934 else if (starts_with(curl_http_proxy, "socks5"))
935 curl_easy_setopt(result,
936 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
937 else if (starts_with(curl_http_proxy, "socks4a"))
938 curl_easy_setopt(result,
939 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
940 else if (starts_with(curl_http_proxy, "socks"))
941 curl_easy_setopt(result,
942 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
943 #endif
944 #if LIBCURL_VERSION_NUM >= 0x073400
945 else if (starts_with(curl_http_proxy, "https")) {
946 curl_easy_setopt(result, CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
947
948 if (http_proxy_ssl_cert)
949 curl_easy_setopt(result, CURLOPT_PROXY_SSLCERT, http_proxy_ssl_cert);
950
951 if (http_proxy_ssl_key)
952 curl_easy_setopt(result, CURLOPT_PROXY_SSLKEY, http_proxy_ssl_key);
953
954 if (has_proxy_cert_password())
955 curl_easy_setopt(result, CURLOPT_PROXY_KEYPASSWD, proxy_cert_auth.password);
956 }
957 #endif
958 if (strstr(curl_http_proxy, "://"))
959 credential_from_url(&proxy_auth, curl_http_proxy);
960 else {
961 struct strbuf url = STRBUF_INIT;
962 strbuf_addf(&url, "http://%s", curl_http_proxy);
963 credential_from_url(&proxy_auth, url.buf);
964 strbuf_release(&url);
965 }
966
967 if (!proxy_auth.host)
968 die("Invalid proxy URL '%s'", curl_http_proxy);
969
970 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
971 var_override(&curl_no_proxy, getenv("NO_PROXY"));
972 var_override(&curl_no_proxy, getenv("no_proxy"));
973 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
974 }
975 init_curl_proxy_auth(result);
976
977 set_curl_keepalive(result);
978
979 return result;
980 }
981
982 static void set_from_env(const char **var, const char *envname)
983 {
984 const char *val = getenv(envname);
985 if (val)
986 *var = val;
987 }
988
989 void http_init(struct remote *remote, const char *url, int proactive_auth)
990 {
991 char *low_speed_limit;
992 char *low_speed_time;
993 char *normalized_url;
994 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
995
996 config.section = "http";
997 config.key = NULL;
998 config.collect_fn = http_options;
999 config.cascade_fn = git_default_config;
1000 config.cb = NULL;
1001
1002 http_is_verbose = 0;
1003 normalized_url = url_normalize(url, &config.url);
1004
1005 git_config(urlmatch_config_entry, &config);
1006 free(normalized_url);
1007 string_list_clear(&config.vars, 1);
1008
1009 #if LIBCURL_VERSION_NUM >= 0x073800
1010 if (http_ssl_backend) {
1011 const curl_ssl_backend **backends;
1012 struct strbuf buf = STRBUF_INIT;
1013 int i;
1014
1015 switch (curl_global_sslset(-1, http_ssl_backend, &backends)) {
1016 case CURLSSLSET_UNKNOWN_BACKEND:
1017 strbuf_addf(&buf, _("Unsupported SSL backend '%s'. "
1018 "Supported SSL backends:"),
1019 http_ssl_backend);
1020 for (i = 0; backends[i]; i++)
1021 strbuf_addf(&buf, "\n\t%s", backends[i]->name);
1022 die("%s", buf.buf);
1023 case CURLSSLSET_NO_BACKENDS:
1024 die(_("Could not set SSL backend to '%s': "
1025 "cURL was built without SSL backends"),
1026 http_ssl_backend);
1027 case CURLSSLSET_TOO_LATE:
1028 die(_("Could not set SSL backend to '%s': already set"),
1029 http_ssl_backend);
1030 case CURLSSLSET_OK:
1031 break; /* Okay! */
1032 }
1033 }
1034 #endif
1035
1036 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1037 die("curl_global_init failed");
1038
1039 http_proactive_auth = proactive_auth;
1040
1041 if (remote && remote->http_proxy)
1042 curl_http_proxy = xstrdup(remote->http_proxy);
1043
1044 if (remote)
1045 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
1046
1047 pragma_header = curl_slist_append(http_copy_default_headers(),
1048 "Pragma: no-cache");
1049 no_pragma_header = curl_slist_append(http_copy_default_headers(),
1050 "Pragma:");
1051
1052 {
1053 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1054 if (http_max_requests != NULL)
1055 max_requests = atoi(http_max_requests);
1056 }
1057
1058 curlm = curl_multi_init();
1059 if (!curlm)
1060 die("curl_multi_init failed");
1061
1062 if (getenv("GIT_SSL_NO_VERIFY"))
1063 curl_ssl_verify = 0;
1064
1065 set_from_env(&ssl_cert, "GIT_SSL_CERT");
1066 set_from_env(&ssl_key, "GIT_SSL_KEY");
1067 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
1068 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
1069
1070 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
1071
1072 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1073 if (low_speed_limit != NULL)
1074 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1075 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1076 if (low_speed_time != NULL)
1077 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1078
1079 if (curl_ssl_verify == -1)
1080 curl_ssl_verify = 1;
1081
1082 curl_session_count = 0;
1083 if (max_requests < 1)
1084 max_requests = DEFAULT_MAX_REQUESTS;
1085
1086 set_from_env(&http_proxy_ssl_cert, "GIT_PROXY_SSL_CERT");
1087 set_from_env(&http_proxy_ssl_key, "GIT_PROXY_SSL_KEY");
1088 set_from_env(&http_proxy_ssl_ca_info, "GIT_PROXY_SSL_CAINFO");
1089
1090 if (getenv("GIT_PROXY_SSL_CERT_PASSWORD_PROTECTED"))
1091 proxy_ssl_cert_password_required = 1;
1092
1093 if (getenv("GIT_CURL_FTP_NO_EPSV"))
1094 curl_ftp_no_epsv = 1;
1095
1096 if (url) {
1097 credential_from_url(&http_auth, url);
1098 if (!ssl_cert_password_required &&
1099 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1100 starts_with(url, "https://"))
1101 ssl_cert_password_required = 1;
1102 }
1103
1104 curl_default = get_curl_handle();
1105 }
1106
1107 void http_cleanup(void)
1108 {
1109 struct active_request_slot *slot = active_queue_head;
1110
1111 while (slot != NULL) {
1112 struct active_request_slot *next = slot->next;
1113 if (slot->curl != NULL) {
1114 xmulti_remove_handle(slot);
1115 curl_easy_cleanup(slot->curl);
1116 }
1117 free(slot);
1118 slot = next;
1119 }
1120 active_queue_head = NULL;
1121
1122 curl_easy_cleanup(curl_default);
1123
1124 curl_multi_cleanup(curlm);
1125 curl_global_cleanup();
1126
1127 string_list_clear(&extra_http_headers, 0);
1128
1129 curl_slist_free_all(pragma_header);
1130 pragma_header = NULL;
1131
1132 curl_slist_free_all(no_pragma_header);
1133 no_pragma_header = NULL;
1134
1135 if (curl_http_proxy) {
1136 free((void *)curl_http_proxy);
1137 curl_http_proxy = NULL;
1138 }
1139
1140 if (proxy_auth.password) {
1141 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1142 FREE_AND_NULL(proxy_auth.password);
1143 }
1144
1145 free((void *)curl_proxyuserpwd);
1146 curl_proxyuserpwd = NULL;
1147
1148 free((void *)http_proxy_authmethod);
1149 http_proxy_authmethod = NULL;
1150
1151 if (cert_auth.password != NULL) {
1152 memset(cert_auth.password, 0, strlen(cert_auth.password));
1153 FREE_AND_NULL(cert_auth.password);
1154 }
1155 ssl_cert_password_required = 0;
1156
1157 if (proxy_cert_auth.password != NULL) {
1158 memset(proxy_cert_auth.password, 0, strlen(proxy_cert_auth.password));
1159 FREE_AND_NULL(proxy_cert_auth.password);
1160 }
1161 proxy_ssl_cert_password_required = 0;
1162
1163 FREE_AND_NULL(cached_accept_language);
1164 }
1165
1166 struct active_request_slot *get_active_slot(void)
1167 {
1168 struct active_request_slot *slot = active_queue_head;
1169 struct active_request_slot *newslot;
1170
1171 int num_transfers;
1172
1173 /* Wait for a slot to open up if the queue is full */
1174 while (active_requests >= max_requests) {
1175 curl_multi_perform(curlm, &num_transfers);
1176 if (num_transfers < active_requests)
1177 process_curl_messages();
1178 }
1179
1180 while (slot != NULL && slot->in_use)
1181 slot = slot->next;
1182
1183 if (slot == NULL) {
1184 newslot = xmalloc(sizeof(*newslot));
1185 newslot->curl = NULL;
1186 newslot->in_use = 0;
1187 newslot->next = NULL;
1188
1189 slot = active_queue_head;
1190 if (slot == NULL) {
1191 active_queue_head = newslot;
1192 } else {
1193 while (slot->next != NULL)
1194 slot = slot->next;
1195 slot->next = newslot;
1196 }
1197 slot = newslot;
1198 }
1199
1200 if (slot->curl == NULL) {
1201 slot->curl = curl_easy_duphandle(curl_default);
1202 curl_session_count++;
1203 }
1204
1205 active_requests++;
1206 slot->in_use = 1;
1207 slot->results = NULL;
1208 slot->finished = NULL;
1209 slot->callback_data = NULL;
1210 slot->callback_func = NULL;
1211 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1212 if (curl_save_cookies)
1213 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1214 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1215 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1216 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1217 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1218 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1219 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1220 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1221 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1222 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1223 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1224
1225 /*
1226 * Default following to off unless "ALWAYS" is configured; this gives
1227 * callers a sane starting point, and they can tweak for individual
1228 * HTTP_FOLLOW_* cases themselves.
1229 */
1230 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1231 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1232 else
1233 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1234
1235 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1236 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1237 if (http_auth.password || curl_empty_auth_enabled())
1238 init_curl_http_auth(slot->curl);
1239
1240 return slot;
1241 }
1242
1243 int start_active_slot(struct active_request_slot *slot)
1244 {
1245 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1246 int num_transfers;
1247
1248 if (curlm_result != CURLM_OK &&
1249 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1250 warning("curl_multi_add_handle failed: %s",
1251 curl_multi_strerror(curlm_result));
1252 active_requests--;
1253 slot->in_use = 0;
1254 return 0;
1255 }
1256
1257 /*
1258 * We know there must be something to do, since we just added
1259 * something.
1260 */
1261 curl_multi_perform(curlm, &num_transfers);
1262 return 1;
1263 }
1264
1265 struct fill_chain {
1266 void *data;
1267 int (*fill)(void *);
1268 struct fill_chain *next;
1269 };
1270
1271 static struct fill_chain *fill_cfg;
1272
1273 void add_fill_function(void *data, int (*fill)(void *))
1274 {
1275 struct fill_chain *new_fill = xmalloc(sizeof(*new_fill));
1276 struct fill_chain **linkp = &fill_cfg;
1277 new_fill->data = data;
1278 new_fill->fill = fill;
1279 new_fill->next = NULL;
1280 while (*linkp)
1281 linkp = &(*linkp)->next;
1282 *linkp = new_fill;
1283 }
1284
1285 void fill_active_slots(void)
1286 {
1287 struct active_request_slot *slot = active_queue_head;
1288
1289 while (active_requests < max_requests) {
1290 struct fill_chain *fill;
1291 for (fill = fill_cfg; fill; fill = fill->next)
1292 if (fill->fill(fill->data))
1293 break;
1294
1295 if (!fill)
1296 break;
1297 }
1298
1299 while (slot != NULL) {
1300 if (!slot->in_use && slot->curl != NULL
1301 && curl_session_count > min_curl_sessions) {
1302 curl_easy_cleanup(slot->curl);
1303 slot->curl = NULL;
1304 curl_session_count--;
1305 }
1306 slot = slot->next;
1307 }
1308 }
1309
1310 void step_active_slots(void)
1311 {
1312 int num_transfers;
1313 CURLMcode curlm_result;
1314
1315 do {
1316 curlm_result = curl_multi_perform(curlm, &num_transfers);
1317 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1318 if (num_transfers < active_requests) {
1319 process_curl_messages();
1320 fill_active_slots();
1321 }
1322 }
1323
1324 void run_active_slot(struct active_request_slot *slot)
1325 {
1326 fd_set readfds;
1327 fd_set writefds;
1328 fd_set excfds;
1329 int max_fd;
1330 struct timeval select_timeout;
1331 int finished = 0;
1332
1333 slot->finished = &finished;
1334 while (!finished) {
1335 step_active_slots();
1336
1337 if (slot->in_use) {
1338 long curl_timeout;
1339 curl_multi_timeout(curlm, &curl_timeout);
1340 if (curl_timeout == 0) {
1341 continue;
1342 } else if (curl_timeout == -1) {
1343 select_timeout.tv_sec = 0;
1344 select_timeout.tv_usec = 50000;
1345 } else {
1346 select_timeout.tv_sec = curl_timeout / 1000;
1347 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1348 }
1349
1350 max_fd = -1;
1351 FD_ZERO(&readfds);
1352 FD_ZERO(&writefds);
1353 FD_ZERO(&excfds);
1354 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1355
1356 /*
1357 * It can happen that curl_multi_timeout returns a pathologically
1358 * long timeout when curl_multi_fdset returns no file descriptors
1359 * to read. See commit message for more details.
1360 */
1361 if (max_fd < 0 &&
1362 (select_timeout.tv_sec > 0 ||
1363 select_timeout.tv_usec > 50000)) {
1364 select_timeout.tv_sec = 0;
1365 select_timeout.tv_usec = 50000;
1366 }
1367
1368 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1369 }
1370 }
1371 }
1372
1373 static void release_active_slot(struct active_request_slot *slot)
1374 {
1375 closedown_active_slot(slot);
1376 if (slot->curl) {
1377 xmulti_remove_handle(slot);
1378 if (curl_session_count > min_curl_sessions) {
1379 curl_easy_cleanup(slot->curl);
1380 slot->curl = NULL;
1381 curl_session_count--;
1382 }
1383 }
1384 fill_active_slots();
1385 }
1386
1387 void finish_all_active_slots(void)
1388 {
1389 struct active_request_slot *slot = active_queue_head;
1390
1391 while (slot != NULL)
1392 if (slot->in_use) {
1393 run_active_slot(slot);
1394 slot = active_queue_head;
1395 } else {
1396 slot = slot->next;
1397 }
1398 }
1399
1400 /* Helpers for modifying and creating URLs */
1401 static inline int needs_quote(int ch)
1402 {
1403 if (((ch >= 'A') && (ch <= 'Z'))
1404 || ((ch >= 'a') && (ch <= 'z'))
1405 || ((ch >= '0') && (ch <= '9'))
1406 || (ch == '/')
1407 || (ch == '-')
1408 || (ch == '.'))
1409 return 0;
1410 return 1;
1411 }
1412
1413 static char *quote_ref_url(const char *base, const char *ref)
1414 {
1415 struct strbuf buf = STRBUF_INIT;
1416 const char *cp;
1417 int ch;
1418
1419 end_url_with_slash(&buf, base);
1420
1421 for (cp = ref; (ch = *cp) != 0; cp++)
1422 if (needs_quote(ch))
1423 strbuf_addf(&buf, "%%%02x", ch);
1424 else
1425 strbuf_addch(&buf, *cp);
1426
1427 return strbuf_detach(&buf, NULL);
1428 }
1429
1430 void append_remote_object_url(struct strbuf *buf, const char *url,
1431 const char *hex,
1432 int only_two_digit_prefix)
1433 {
1434 end_url_with_slash(buf, url);
1435
1436 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1437 if (!only_two_digit_prefix)
1438 strbuf_addstr(buf, hex + 2);
1439 }
1440
1441 char *get_remote_object_url(const char *url, const char *hex,
1442 int only_two_digit_prefix)
1443 {
1444 struct strbuf buf = STRBUF_INIT;
1445 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1446 return strbuf_detach(&buf, NULL);
1447 }
1448
1449 void normalize_curl_result(CURLcode *result, long http_code,
1450 char *errorstr, size_t errorlen)
1451 {
1452 /*
1453 * If we see a failing http code with CURLE_OK, we have turned off
1454 * FAILONERROR (to keep the server's custom error response), and should
1455 * translate the code into failure here.
1456 *
1457 * Likewise, if we see a redirect (30x code), that means we turned off
1458 * redirect-following, and we should treat the result as an error.
1459 */
1460 if (*result == CURLE_OK && http_code >= 300) {
1461 *result = CURLE_HTTP_RETURNED_ERROR;
1462 /*
1463 * Normally curl will already have put the "reason phrase"
1464 * from the server into curl_errorstr; unfortunately without
1465 * FAILONERROR it is lost, so we can give only the numeric
1466 * status code.
1467 */
1468 xsnprintf(errorstr, errorlen,
1469 "The requested URL returned error: %ld",
1470 http_code);
1471 }
1472 }
1473
1474 static int handle_curl_result(struct slot_results *results)
1475 {
1476 normalize_curl_result(&results->curl_result, results->http_code,
1477 curl_errorstr, sizeof(curl_errorstr));
1478
1479 if (results->curl_result == CURLE_OK) {
1480 credential_approve(&http_auth);
1481 credential_approve(&proxy_auth);
1482 credential_approve(&cert_auth);
1483 return HTTP_OK;
1484 } else if (results->curl_result == CURLE_SSL_CERTPROBLEM) {
1485 /*
1486 * We can't tell from here whether it's a bad path, bad
1487 * certificate, bad password, or something else wrong
1488 * with the certificate. So we reject the credential to
1489 * avoid caching or saving a bad password.
1490 */
1491 credential_reject(&cert_auth);
1492 return HTTP_NOAUTH;
1493 } else if (missing_target(results))
1494 return HTTP_MISSING_TARGET;
1495 else if (results->http_code == 401) {
1496 if (http_auth.username && http_auth.password) {
1497 credential_reject(&http_auth);
1498 return HTTP_NOAUTH;
1499 } else {
1500 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1501 if (results->auth_avail) {
1502 http_auth_methods &= results->auth_avail;
1503 http_auth_methods_restricted = 1;
1504 }
1505 return HTTP_REAUTH;
1506 }
1507 } else {
1508 if (results->http_connectcode == 407)
1509 credential_reject(&proxy_auth);
1510 if (!curl_errorstr[0])
1511 strlcpy(curl_errorstr,
1512 curl_easy_strerror(results->curl_result),
1513 sizeof(curl_errorstr));
1514 return HTTP_ERROR;
1515 }
1516 }
1517
1518 int run_one_slot(struct active_request_slot *slot,
1519 struct slot_results *results)
1520 {
1521 slot->results = results;
1522 if (!start_active_slot(slot)) {
1523 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1524 "failed to start HTTP request");
1525 return HTTP_START_FAILED;
1526 }
1527
1528 run_active_slot(slot);
1529 return handle_curl_result(results);
1530 }
1531
1532 struct curl_slist *http_copy_default_headers(void)
1533 {
1534 struct curl_slist *headers = NULL;
1535 const struct string_list_item *item;
1536
1537 for_each_string_list_item(item, &extra_http_headers)
1538 headers = curl_slist_append(headers, item->string);
1539
1540 return headers;
1541 }
1542
1543 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1544 {
1545 char *ptr;
1546 CURLcode ret;
1547
1548 strbuf_reset(buf);
1549 ret = curl_easy_getinfo(curl, info, &ptr);
1550 if (!ret && ptr)
1551 strbuf_addstr(buf, ptr);
1552 return ret;
1553 }
1554
1555 /*
1556 * Check for and extract a content-type parameter. "raw"
1557 * should be positioned at the start of the potential
1558 * parameter, with any whitespace already removed.
1559 *
1560 * "name" is the name of the parameter. The value is appended
1561 * to "out".
1562 */
1563 static int extract_param(const char *raw, const char *name,
1564 struct strbuf *out)
1565 {
1566 size_t len = strlen(name);
1567
1568 if (strncasecmp(raw, name, len))
1569 return -1;
1570 raw += len;
1571
1572 if (*raw != '=')
1573 return -1;
1574 raw++;
1575
1576 while (*raw && !isspace(*raw) && *raw != ';')
1577 strbuf_addch(out, *raw++);
1578 return 0;
1579 }
1580
1581 /*
1582 * Extract a normalized version of the content type, with any
1583 * spaces suppressed, all letters lowercased, and no trailing ";"
1584 * or parameters.
1585 *
1586 * Note that we will silently remove even invalid whitespace. For
1587 * example, "text / plain" is specifically forbidden by RFC 2616,
1588 * but "text/plain" is the only reasonable output, and this keeps
1589 * our code simple.
1590 *
1591 * If the "charset" argument is not NULL, store the value of any
1592 * charset parameter there.
1593 *
1594 * Example:
1595 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1596 * "text / plain" -> "text/plain"
1597 */
1598 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1599 struct strbuf *charset)
1600 {
1601 const char *p;
1602
1603 strbuf_reset(type);
1604 strbuf_grow(type, raw->len);
1605 for (p = raw->buf; *p; p++) {
1606 if (isspace(*p))
1607 continue;
1608 if (*p == ';') {
1609 p++;
1610 break;
1611 }
1612 strbuf_addch(type, tolower(*p));
1613 }
1614
1615 if (!charset)
1616 return;
1617
1618 strbuf_reset(charset);
1619 while (*p) {
1620 while (isspace(*p) || *p == ';')
1621 p++;
1622 if (!extract_param(p, "charset", charset))
1623 return;
1624 while (*p && !isspace(*p))
1625 p++;
1626 }
1627
1628 if (!charset->len && starts_with(type->buf, "text/"))
1629 strbuf_addstr(charset, "ISO-8859-1");
1630 }
1631
1632 static void write_accept_language(struct strbuf *buf)
1633 {
1634 /*
1635 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1636 * that, q-value will be smaller than 0.001, the minimum q-value the
1637 * HTTP specification allows. See
1638 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1639 */
1640 const int MAX_DECIMAL_PLACES = 3;
1641 const int MAX_LANGUAGE_TAGS = 1000;
1642 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1643 char **language_tags = NULL;
1644 int num_langs = 0;
1645 const char *s = get_preferred_languages();
1646 int i;
1647 struct strbuf tag = STRBUF_INIT;
1648
1649 /* Don't add Accept-Language header if no language is preferred. */
1650 if (!s)
1651 return;
1652
1653 /*
1654 * Split the colon-separated string of preferred languages into
1655 * language_tags array.
1656 */
1657 do {
1658 /* collect language tag */
1659 for (; *s && (isalnum(*s) || *s == '_'); s++)
1660 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1661
1662 /* skip .codeset, @modifier and any other unnecessary parts */
1663 while (*s && *s != ':')
1664 s++;
1665
1666 if (tag.len) {
1667 num_langs++;
1668 REALLOC_ARRAY(language_tags, num_langs);
1669 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1670 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1671 break;
1672 }
1673 } while (*s++);
1674
1675 /* write Accept-Language header into buf */
1676 if (num_langs) {
1677 int last_buf_len = 0;
1678 int max_q;
1679 int decimal_places;
1680 char q_format[32];
1681
1682 /* add '*' */
1683 REALLOC_ARRAY(language_tags, num_langs + 1);
1684 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1685
1686 /* compute decimal_places */
1687 for (max_q = 1, decimal_places = 0;
1688 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1689 decimal_places++, max_q *= 10)
1690 ;
1691
1692 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1693
1694 strbuf_addstr(buf, "Accept-Language: ");
1695
1696 for (i = 0; i < num_langs; i++) {
1697 if (i > 0)
1698 strbuf_addstr(buf, ", ");
1699
1700 strbuf_addstr(buf, language_tags[i]);
1701
1702 if (i > 0)
1703 strbuf_addf(buf, q_format, max_q - i);
1704
1705 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1706 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1707 break;
1708 }
1709
1710 last_buf_len = buf->len;
1711 }
1712 }
1713
1714 /* free language tags -- last one is a static '*' */
1715 for (i = 0; i < num_langs - 1; i++)
1716 free(language_tags[i]);
1717 free(language_tags);
1718 }
1719
1720 /*
1721 * Get an Accept-Language header which indicates user's preferred languages.
1722 *
1723 * Examples:
1724 * LANGUAGE= -> ""
1725 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1726 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1727 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1728 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1729 * LANGUAGE= LANG=C -> ""
1730 */
1731 static const char *get_accept_language(void)
1732 {
1733 if (!cached_accept_language) {
1734 struct strbuf buf = STRBUF_INIT;
1735 write_accept_language(&buf);
1736 if (buf.len > 0)
1737 cached_accept_language = strbuf_detach(&buf, NULL);
1738 }
1739
1740 return cached_accept_language;
1741 }
1742
1743 static void http_opt_request_remainder(CURL *curl, off_t pos)
1744 {
1745 char buf[128];
1746 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1747 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1748 }
1749
1750 /* http_request() targets */
1751 #define HTTP_REQUEST_STRBUF 0
1752 #define HTTP_REQUEST_FILE 1
1753
1754 static int http_request(const char *url,
1755 void *result, int target,
1756 const struct http_get_options *options)
1757 {
1758 struct active_request_slot *slot;
1759 struct slot_results results;
1760 struct curl_slist *headers = http_copy_default_headers();
1761 struct strbuf buf = STRBUF_INIT;
1762 const char *accept_language;
1763 int ret;
1764
1765 slot = get_active_slot();
1766 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1767
1768 if (result == NULL) {
1769 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1770 } else {
1771 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1772 curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, result);
1773
1774 if (target == HTTP_REQUEST_FILE) {
1775 off_t posn = ftello(result);
1776 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1777 fwrite);
1778 if (posn > 0)
1779 http_opt_request_remainder(slot->curl, posn);
1780 } else
1781 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1782 fwrite_buffer);
1783 }
1784
1785 accept_language = get_accept_language();
1786
1787 if (accept_language)
1788 headers = curl_slist_append(headers, accept_language);
1789
1790 strbuf_addstr(&buf, "Pragma:");
1791 if (options && options->no_cache)
1792 strbuf_addstr(&buf, " no-cache");
1793 if (options && options->initial_request &&
1794 http_follow_config == HTTP_FOLLOW_INITIAL)
1795 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1796
1797 headers = curl_slist_append(headers, buf.buf);
1798
1799 /* Add additional headers here */
1800 if (options && options->extra_headers) {
1801 const struct string_list_item *item;
1802 for_each_string_list_item(item, options->extra_headers) {
1803 headers = curl_slist_append(headers, item->string);
1804 }
1805 }
1806
1807 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1808 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1809 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1810 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1811
1812 ret = run_one_slot(slot, &results);
1813
1814 if (options && options->content_type) {
1815 struct strbuf raw = STRBUF_INIT;
1816 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1817 extract_content_type(&raw, options->content_type,
1818 options->charset);
1819 strbuf_release(&raw);
1820 }
1821
1822 if (options && options->effective_url)
1823 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1824 options->effective_url);
1825
1826 curl_slist_free_all(headers);
1827 strbuf_release(&buf);
1828
1829 return ret;
1830 }
1831
1832 /*
1833 * Update the "base" url to a more appropriate value, as deduced by
1834 * redirects seen when requesting a URL starting with "url".
1835 *
1836 * The "asked" parameter is a URL that we asked curl to access, and must begin
1837 * with "base".
1838 *
1839 * The "got" parameter is the URL that curl reported to us as where we ended
1840 * up.
1841 *
1842 * Returns 1 if we updated the base url, 0 otherwise.
1843 *
1844 * Our basic strategy is to compare "base" and "asked" to find the bits
1845 * specific to our request. We then strip those bits off of "got" to yield the
1846 * new base. So for example, if our base is "http://example.com/foo.git",
1847 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1848 * with "https://other.example.com/foo.git/info/refs". We would want the
1849 * new URL to become "https://other.example.com/foo.git".
1850 *
1851 * Note that this assumes a sane redirect scheme. It's entirely possible
1852 * in the example above to end up at a URL that does not even end in
1853 * "info/refs". In such a case we die. There's not much we can do, such a
1854 * scheme is unlikely to represent a real git repository, and failing to
1855 * rewrite the base opens options for malicious redirects to do funny things.
1856 */
1857 static int update_url_from_redirect(struct strbuf *base,
1858 const char *asked,
1859 const struct strbuf *got)
1860 {
1861 const char *tail;
1862 size_t new_len;
1863
1864 if (!strcmp(asked, got->buf))
1865 return 0;
1866
1867 if (!skip_prefix(asked, base->buf, &tail))
1868 BUG("update_url_from_redirect: %s is not a superset of %s",
1869 asked, base->buf);
1870
1871 new_len = got->len;
1872 if (!strip_suffix_mem(got->buf, &new_len, tail))
1873 die(_("unable to update url base from redirection:\n"
1874 " asked for: %s\n"
1875 " redirect: %s"),
1876 asked, got->buf);
1877
1878 strbuf_reset(base);
1879 strbuf_add(base, got->buf, new_len);
1880
1881 return 1;
1882 }
1883
1884 static int http_request_reauth(const char *url,
1885 void *result, int target,
1886 struct http_get_options *options)
1887 {
1888 int ret = http_request(url, result, target, options);
1889
1890 if (ret != HTTP_OK && ret != HTTP_REAUTH)
1891 return ret;
1892
1893 if (options && options->effective_url && options->base_url) {
1894 if (update_url_from_redirect(options->base_url,
1895 url, options->effective_url)) {
1896 credential_from_url(&http_auth, options->base_url->buf);
1897 url = options->effective_url->buf;
1898 }
1899 }
1900
1901 if (ret != HTTP_REAUTH)
1902 return ret;
1903
1904 /*
1905 * The previous request may have put cruft into our output stream; we
1906 * should clear it out before making our next request.
1907 */
1908 switch (target) {
1909 case HTTP_REQUEST_STRBUF:
1910 strbuf_reset(result);
1911 break;
1912 case HTTP_REQUEST_FILE:
1913 if (fflush(result)) {
1914 error_errno("unable to flush a file");
1915 return HTTP_START_FAILED;
1916 }
1917 rewind(result);
1918 if (ftruncate(fileno(result), 0) < 0) {
1919 error_errno("unable to truncate a file");
1920 return HTTP_START_FAILED;
1921 }
1922 break;
1923 default:
1924 BUG("Unknown http_request target");
1925 }
1926
1927 credential_fill(&http_auth);
1928
1929 return http_request(url, result, target, options);
1930 }
1931
1932 int http_get_strbuf(const char *url,
1933 struct strbuf *result,
1934 struct http_get_options *options)
1935 {
1936 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1937 }
1938
1939 /*
1940 * Downloads a URL and stores the result in the given file.
1941 *
1942 * If a previous interrupted download is detected (i.e. a previous temporary
1943 * file is still around) the download is resumed.
1944 */
1945 static int http_get_file(const char *url, const char *filename,
1946 struct http_get_options *options)
1947 {
1948 int ret;
1949 struct strbuf tmpfile = STRBUF_INIT;
1950 FILE *result;
1951
1952 strbuf_addf(&tmpfile, "%s.temp", filename);
1953 result = fopen(tmpfile.buf, "a");
1954 if (!result) {
1955 error("Unable to open local file %s", tmpfile.buf);
1956 ret = HTTP_ERROR;
1957 goto cleanup;
1958 }
1959
1960 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1961 fclose(result);
1962
1963 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1964 ret = HTTP_ERROR;
1965 cleanup:
1966 strbuf_release(&tmpfile);
1967 return ret;
1968 }
1969
1970 int http_fetch_ref(const char *base, struct ref *ref)
1971 {
1972 struct http_get_options options = {0};
1973 char *url;
1974 struct strbuf buffer = STRBUF_INIT;
1975 int ret = -1;
1976
1977 options.no_cache = 1;
1978
1979 url = quote_ref_url(base, ref->name);
1980 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1981 strbuf_rtrim(&buffer);
1982 if (buffer.len == the_hash_algo->hexsz)
1983 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1984 else if (starts_with(buffer.buf, "ref: ")) {
1985 ref->symref = xstrdup(buffer.buf + 5);
1986 ret = 0;
1987 }
1988 }
1989
1990 strbuf_release(&buffer);
1991 free(url);
1992 return ret;
1993 }
1994
1995 /* Helpers for fetching packs */
1996 static char *fetch_pack_index(unsigned char *hash, const char *base_url)
1997 {
1998 char *url, *tmp;
1999 struct strbuf buf = STRBUF_INIT;
2000
2001 if (http_is_verbose)
2002 fprintf(stderr, "Getting index for pack %s\n", hash_to_hex(hash));
2003
2004 end_url_with_slash(&buf, base_url);
2005 strbuf_addf(&buf, "objects/pack/pack-%s.idx", hash_to_hex(hash));
2006 url = strbuf_detach(&buf, NULL);
2007
2008 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(hash));
2009 tmp = strbuf_detach(&buf, NULL);
2010
2011 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
2012 error("Unable to get pack index %s", url);
2013 FREE_AND_NULL(tmp);
2014 }
2015
2016 free(url);
2017 return tmp;
2018 }
2019
2020 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
2021 unsigned char *sha1, const char *base_url)
2022 {
2023 struct packed_git *new_pack;
2024 char *tmp_idx = NULL;
2025 int ret;
2026
2027 if (has_pack_index(sha1)) {
2028 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
2029 if (!new_pack)
2030 return -1; /* parse_pack_index() already issued error message */
2031 goto add_pack;
2032 }
2033
2034 tmp_idx = fetch_pack_index(sha1, base_url);
2035 if (!tmp_idx)
2036 return -1;
2037
2038 new_pack = parse_pack_index(sha1, tmp_idx);
2039 if (!new_pack) {
2040 unlink(tmp_idx);
2041 free(tmp_idx);
2042
2043 return -1; /* parse_pack_index() already issued error message */
2044 }
2045
2046 ret = verify_pack_index(new_pack);
2047 if (!ret) {
2048 close_pack_index(new_pack);
2049 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
2050 }
2051 free(tmp_idx);
2052 if (ret)
2053 return -1;
2054
2055 add_pack:
2056 new_pack->next = *packs_head;
2057 *packs_head = new_pack;
2058 return 0;
2059 }
2060
2061 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
2062 {
2063 struct http_get_options options = {0};
2064 int ret = 0;
2065 char *url;
2066 const char *data;
2067 struct strbuf buf = STRBUF_INIT;
2068 struct object_id oid;
2069
2070 end_url_with_slash(&buf, base_url);
2071 strbuf_addstr(&buf, "objects/info/packs");
2072 url = strbuf_detach(&buf, NULL);
2073
2074 options.no_cache = 1;
2075 ret = http_get_strbuf(url, &buf, &options);
2076 if (ret != HTTP_OK)
2077 goto cleanup;
2078
2079 data = buf.buf;
2080 while (*data) {
2081 if (skip_prefix(data, "P pack-", &data) &&
2082 !parse_oid_hex(data, &oid, &data) &&
2083 skip_prefix(data, ".pack", &data) &&
2084 (*data == '\n' || *data == '\0')) {
2085 fetch_and_setup_pack_index(packs_head, oid.hash, base_url);
2086 } else {
2087 data = strchrnul(data, '\n');
2088 }
2089 if (*data)
2090 data++; /* skip past newline */
2091 }
2092
2093 cleanup:
2094 free(url);
2095 return ret;
2096 }
2097
2098 void release_http_pack_request(struct http_pack_request *preq)
2099 {
2100 if (preq->packfile != NULL) {
2101 fclose(preq->packfile);
2102 preq->packfile = NULL;
2103 }
2104 preq->slot = NULL;
2105 strbuf_release(&preq->tmpfile);
2106 free(preq->url);
2107 free(preq);
2108 }
2109
2110 static const char *default_index_pack_args[] =
2111 {"index-pack", "--stdin", NULL};
2112
2113 int finish_http_pack_request(struct http_pack_request *preq)
2114 {
2115 struct child_process ip = CHILD_PROCESS_INIT;
2116 int tmpfile_fd;
2117 int ret = 0;
2118
2119 fclose(preq->packfile);
2120 preq->packfile = NULL;
2121
2122 tmpfile_fd = xopen(preq->tmpfile.buf, O_RDONLY);
2123
2124 ip.git_cmd = 1;
2125 ip.in = tmpfile_fd;
2126 ip.argv = preq->index_pack_args ? preq->index_pack_args
2127 : default_index_pack_args;
2128
2129 if (preq->preserve_index_pack_stdout)
2130 ip.out = 0;
2131 else
2132 ip.no_stdout = 1;
2133
2134 if (run_command(&ip)) {
2135 ret = -1;
2136 goto cleanup;
2137 }
2138
2139 cleanup:
2140 close(tmpfile_fd);
2141 unlink(preq->tmpfile.buf);
2142 return ret;
2143 }
2144
2145 void http_install_packfile(struct packed_git *p,
2146 struct packed_git **list_to_remove_from)
2147 {
2148 struct packed_git **lst = list_to_remove_from;
2149
2150 while (*lst != p)
2151 lst = &((*lst)->next);
2152 *lst = (*lst)->next;
2153
2154 install_packed_git(the_repository, p);
2155 }
2156
2157 struct http_pack_request *new_http_pack_request(
2158 const unsigned char *packed_git_hash, const char *base_url) {
2159
2160 struct strbuf buf = STRBUF_INIT;
2161
2162 end_url_with_slash(&buf, base_url);
2163 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2164 hash_to_hex(packed_git_hash));
2165 return new_direct_http_pack_request(packed_git_hash,
2166 strbuf_detach(&buf, NULL));
2167 }
2168
2169 struct http_pack_request *new_direct_http_pack_request(
2170 const unsigned char *packed_git_hash, char *url)
2171 {
2172 off_t prev_posn = 0;
2173 struct http_pack_request *preq;
2174
2175 CALLOC_ARRAY(preq, 1);
2176 strbuf_init(&preq->tmpfile, 0);
2177
2178 preq->url = url;
2179
2180 strbuf_addf(&preq->tmpfile, "%s.temp", sha1_pack_name(packed_git_hash));
2181 preq->packfile = fopen(preq->tmpfile.buf, "a");
2182 if (!preq->packfile) {
2183 error("Unable to open local file %s for pack",
2184 preq->tmpfile.buf);
2185 goto abort;
2186 }
2187
2188 preq->slot = get_active_slot();
2189 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEDATA, preq->packfile);
2190 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2191 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2192 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2193 no_pragma_header);
2194
2195 /*
2196 * If there is data present from a previous transfer attempt,
2197 * resume where it left off
2198 */
2199 prev_posn = ftello(preq->packfile);
2200 if (prev_posn>0) {
2201 if (http_is_verbose)
2202 fprintf(stderr,
2203 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2204 hash_to_hex(packed_git_hash),
2205 (uintmax_t)prev_posn);
2206 http_opt_request_remainder(preq->slot->curl, prev_posn);
2207 }
2208
2209 return preq;
2210
2211 abort:
2212 strbuf_release(&preq->tmpfile);
2213 free(preq->url);
2214 free(preq);
2215 return NULL;
2216 }
2217
2218 /* Helpers for fetching objects (loose) */
2219 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2220 void *data)
2221 {
2222 unsigned char expn[4096];
2223 size_t size = eltsize * nmemb;
2224 int posn = 0;
2225 struct http_object_request *freq = data;
2226 struct active_request_slot *slot = freq->slot;
2227
2228 if (slot) {
2229 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2230 &slot->http_code);
2231 if (c != CURLE_OK)
2232 BUG("curl_easy_getinfo for HTTP code failed: %s",
2233 curl_easy_strerror(c));
2234 if (slot->http_code >= 300)
2235 return nmemb;
2236 }
2237
2238 do {
2239 ssize_t retval = xwrite(freq->localfile,
2240 (char *) ptr + posn, size - posn);
2241 if (retval < 0)
2242 return posn / eltsize;
2243 posn += retval;
2244 } while (posn < size);
2245
2246 freq->stream.avail_in = size;
2247 freq->stream.next_in = (void *)ptr;
2248 do {
2249 freq->stream.next_out = expn;
2250 freq->stream.avail_out = sizeof(expn);
2251 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2252 the_hash_algo->update_fn(&freq->c, expn,
2253 sizeof(expn) - freq->stream.avail_out);
2254 } while (freq->stream.avail_in && freq->zret == Z_OK);
2255 return nmemb;
2256 }
2257
2258 struct http_object_request *new_http_object_request(const char *base_url,
2259 const struct object_id *oid)
2260 {
2261 char *hex = oid_to_hex(oid);
2262 struct strbuf filename = STRBUF_INIT;
2263 struct strbuf prevfile = STRBUF_INIT;
2264 int prevlocal;
2265 char prev_buf[PREV_BUF_SIZE];
2266 ssize_t prev_read = 0;
2267 off_t prev_posn = 0;
2268 struct http_object_request *freq;
2269
2270 CALLOC_ARRAY(freq, 1);
2271 strbuf_init(&freq->tmpfile, 0);
2272 oidcpy(&freq->oid, oid);
2273 freq->localfile = -1;
2274
2275 loose_object_path(the_repository, &filename, oid);
2276 strbuf_addf(&freq->tmpfile, "%s.temp", filename.buf);
2277
2278 strbuf_addf(&prevfile, "%s.prev", filename.buf);
2279 unlink_or_warn(prevfile.buf);
2280 rename(freq->tmpfile.buf, prevfile.buf);
2281 unlink_or_warn(freq->tmpfile.buf);
2282 strbuf_release(&filename);
2283
2284 if (freq->localfile != -1)
2285 error("fd leakage in start: %d", freq->localfile);
2286 freq->localfile = open(freq->tmpfile.buf,
2287 O_WRONLY | O_CREAT | O_EXCL, 0666);
2288 /*
2289 * This could have failed due to the "lazy directory creation";
2290 * try to mkdir the last path component.
2291 */
2292 if (freq->localfile < 0 && errno == ENOENT) {
2293 char *dir = strrchr(freq->tmpfile.buf, '/');
2294 if (dir) {
2295 *dir = 0;
2296 mkdir(freq->tmpfile.buf, 0777);
2297 *dir = '/';
2298 }
2299 freq->localfile = open(freq->tmpfile.buf,
2300 O_WRONLY | O_CREAT | O_EXCL, 0666);
2301 }
2302
2303 if (freq->localfile < 0) {
2304 error_errno("Couldn't create temporary file %s",
2305 freq->tmpfile.buf);
2306 goto abort;
2307 }
2308
2309 git_inflate_init(&freq->stream);
2310
2311 the_hash_algo->init_fn(&freq->c);
2312
2313 freq->url = get_remote_object_url(base_url, hex, 0);
2314
2315 /*
2316 * If a previous temp file is present, process what was already
2317 * fetched.
2318 */
2319 prevlocal = open(prevfile.buf, O_RDONLY);
2320 if (prevlocal != -1) {
2321 do {
2322 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2323 if (prev_read>0) {
2324 if (fwrite_sha1_file(prev_buf,
2325 1,
2326 prev_read,
2327 freq) == prev_read) {
2328 prev_posn += prev_read;
2329 } else {
2330 prev_read = -1;
2331 }
2332 }
2333 } while (prev_read > 0);
2334 close(prevlocal);
2335 }
2336 unlink_or_warn(prevfile.buf);
2337 strbuf_release(&prevfile);
2338
2339 /*
2340 * Reset inflate/SHA1 if there was an error reading the previous temp
2341 * file; also rewind to the beginning of the local file.
2342 */
2343 if (prev_read == -1) {
2344 memset(&freq->stream, 0, sizeof(freq->stream));
2345 git_inflate_init(&freq->stream);
2346 the_hash_algo->init_fn(&freq->c);
2347 if (prev_posn>0) {
2348 prev_posn = 0;
2349 lseek(freq->localfile, 0, SEEK_SET);
2350 if (ftruncate(freq->localfile, 0) < 0) {
2351 error_errno("Couldn't truncate temporary file %s",
2352 freq->tmpfile.buf);
2353 goto abort;
2354 }
2355 }
2356 }
2357
2358 freq->slot = get_active_slot();
2359
2360 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEDATA, freq);
2361 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2362 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2363 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2364 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2365 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2366
2367 /*
2368 * If we have successfully processed data from a previous fetch
2369 * attempt, only fetch the data we don't already have.
2370 */
2371 if (prev_posn>0) {
2372 if (http_is_verbose)
2373 fprintf(stderr,
2374 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2375 hex, (uintmax_t)prev_posn);
2376 http_opt_request_remainder(freq->slot->curl, prev_posn);
2377 }
2378
2379 return freq;
2380
2381 abort:
2382 strbuf_release(&prevfile);
2383 free(freq->url);
2384 free(freq);
2385 return NULL;
2386 }
2387
2388 void process_http_object_request(struct http_object_request *freq)
2389 {
2390 if (freq->slot == NULL)
2391 return;
2392 freq->curl_result = freq->slot->curl_result;
2393 freq->http_code = freq->slot->http_code;
2394 freq->slot = NULL;
2395 }
2396
2397 int finish_http_object_request(struct http_object_request *freq)
2398 {
2399 struct stat st;
2400 struct strbuf filename = STRBUF_INIT;
2401
2402 close(freq->localfile);
2403 freq->localfile = -1;
2404
2405 process_http_object_request(freq);
2406
2407 if (freq->http_code == 416) {
2408 warning("requested range invalid; we may already have all the data.");
2409 } else if (freq->curl_result != CURLE_OK) {
2410 if (stat(freq->tmpfile.buf, &st) == 0)
2411 if (st.st_size == 0)
2412 unlink_or_warn(freq->tmpfile.buf);
2413 return -1;
2414 }
2415
2416 git_inflate_end(&freq->stream);
2417 the_hash_algo->final_oid_fn(&freq->real_oid, &freq->c);
2418 if (freq->zret != Z_STREAM_END) {
2419 unlink_or_warn(freq->tmpfile.buf);
2420 return -1;
2421 }
2422 if (!oideq(&freq->oid, &freq->real_oid)) {
2423 unlink_or_warn(freq->tmpfile.buf);
2424 return -1;
2425 }
2426 loose_object_path(the_repository, &filename, &freq->oid);
2427 freq->rename = finalize_object_file(freq->tmpfile.buf, filename.buf);
2428 strbuf_release(&filename);
2429
2430 return freq->rename;
2431 }
2432
2433 void abort_http_object_request(struct http_object_request *freq)
2434 {
2435 unlink_or_warn(freq->tmpfile.buf);
2436
2437 release_http_object_request(freq);
2438 }
2439
2440 void release_http_object_request(struct http_object_request *freq)
2441 {
2442 if (freq->localfile != -1) {
2443 close(freq->localfile);
2444 freq->localfile = -1;
2445 }
2446 FREE_AND_NULL(freq->url);
2447 if (freq->slot != NULL) {
2448 freq->slot->callback_func = NULL;
2449 freq->slot->callback_data = NULL;
2450 release_active_slot(freq->slot);
2451 freq->slot = NULL;
2452 }
2453 strbuf_release(&freq->tmpfile);
2454 }
git for Debian