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http: update curl http/2 info matching for curl 8.3.0
[git.git] / http.c
blobfb4ecf911fd3a8958539a0fe2cb081c3b53a865f
1 #include "git-compat-util.h"
2 #include "git-curl-compat.h"
3 #include "http.h"
4 #include "config.h"
5 #include "pack.h"
6 #include "sideband.h"
7 #include "run-command.h"
8 #include "url.h"
9 #include "urlmatch.h"
10 #include "credential.h"
11 #include "version.h"
12 #include "pkt-line.h"
13 #include "gettext.h"
14 #include "transport.h"
15 #include "packfile.h"
16 #include "protocol.h"
17 #include "string-list.h"
18 #include "object-store.h"
19
20 static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
21 static int trace_curl_data = 1;
22 static int trace_curl_redact = 1;
23 long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
24 int active_requests;
25 int http_is_verbose;
26 ssize_t http_post_buffer = 16 * LARGE_PACKET_MAX;
27
28 static int min_curl_sessions = 1;
29 static int curl_session_count;
30 static int max_requests = -1;
31 static CURLM *curlm;
32 static CURL *curl_default;
33
34 #define PREV_BUF_SIZE 4096
35
36 char curl_errorstr[CURL_ERROR_SIZE];
37
38 static int curl_ssl_verify = -1;
39 static int curl_ssl_try;
40 static const char *curl_http_version = NULL;
41 static const char *ssl_cert;
42 static const char *ssl_cipherlist;
43 static const char *ssl_version;
44 static struct {
45 const char *name;
46 long ssl_version;
47 } sslversions[] = {
48 { "sslv2", CURL_SSLVERSION_SSLv2 },
49 { "sslv3", CURL_SSLVERSION_SSLv3 },
50 { "tlsv1", CURL_SSLVERSION_TLSv1 },
51 #ifdef GIT_CURL_HAVE_CURL_SSLVERSION_TLSv1_0
52 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
53 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
54 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
55 #endif
56 #ifdef GIT_CURL_HAVE_CURL_SSLVERSION_TLSv1_3
57 { "tlsv1.3", CURL_SSLVERSION_TLSv1_3 },
58 #endif
59 };
60 static const char *ssl_key;
61 static const char *ssl_capath;
62 static const char *curl_no_proxy;
63 #ifdef GIT_CURL_HAVE_CURLOPT_PINNEDPUBLICKEY
64 static const char *ssl_pinnedkey;
65 #endif
66 static const char *ssl_cainfo;
67 static long curl_low_speed_limit = -1;
68 static long curl_low_speed_time = -1;
69 static int curl_ftp_no_epsv;
70 static const char *curl_http_proxy;
71 static const char *http_proxy_authmethod;
72
73 static const char *http_proxy_ssl_cert;
74 static const char *http_proxy_ssl_key;
75 static const char *http_proxy_ssl_ca_info;
76 static struct credential proxy_cert_auth = CREDENTIAL_INIT;
77 static int proxy_ssl_cert_password_required;
78
79 static struct {
80 const char *name;
81 long curlauth_param;
82 } proxy_authmethods[] = {
83 { "basic", CURLAUTH_BASIC },
84 { "digest", CURLAUTH_DIGEST },
85 { "negotiate", CURLAUTH_GSSNEGOTIATE },
86 { "ntlm", CURLAUTH_NTLM },
87 { "anyauth", CURLAUTH_ANY },
88 /*
89 * CURLAUTH_DIGEST_IE has no corresponding command-line option in
90 * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
91 * here, too
92 */
93 };
94 #ifdef CURLGSSAPI_DELEGATION_FLAG
95 static const char *curl_deleg;
96 static struct {
97 const char *name;
98 long curl_deleg_param;
99 } curl_deleg_levels[] = {
100 { "none", CURLGSSAPI_DELEGATION_NONE },
101 { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
102 { "always", CURLGSSAPI_DELEGATION_FLAG },
103 };
104 #endif
105
106 static struct credential proxy_auth = CREDENTIAL_INIT;
107 static const char *curl_proxyuserpwd;
108 static const char *curl_cookie_file;
109 static int curl_save_cookies;
110 struct credential http_auth = CREDENTIAL_INIT;
111 static int http_proactive_auth;
112 static const char *user_agent;
113 static int curl_empty_auth = -1;
114
115 enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
116
117 static struct credential cert_auth = CREDENTIAL_INIT;
118 static int ssl_cert_password_required;
119 static unsigned long http_auth_methods = CURLAUTH_ANY;
120 static int http_auth_methods_restricted;
121 /* Modes for which empty_auth cannot actually help us. */
122 static unsigned long empty_auth_useless =
123 CURLAUTH_BASIC
124 | CURLAUTH_DIGEST_IE
125 | CURLAUTH_DIGEST;
126
127 static struct curl_slist *pragma_header;
128 static struct curl_slist *no_pragma_header;
129 static struct string_list extra_http_headers = STRING_LIST_INIT_DUP;
130
131 static struct curl_slist *host_resolutions;
132
133 static struct active_request_slot *active_queue_head;
134
135 static char *cached_accept_language;
136
137 static char *http_ssl_backend;
138
139 static int http_schannel_check_revoke = 1;
140 /*
141 * With the backend being set to `schannel`, setting sslCAinfo would override
142 * the Certificate Store in cURL v7.60.0 and later, which is not what we want
143 * by default.
144 */
145 static int http_schannel_use_ssl_cainfo;
146
147 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
148 {
149 size_t size = eltsize * nmemb;
150 struct buffer *buffer = buffer_;
151
152 if (size > buffer->buf.len - buffer->posn)
153 size = buffer->buf.len - buffer->posn;
154 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
155 buffer->posn += size;
156
157 return size / eltsize;
158 }
159
160 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
161 {
162 struct buffer *buffer = clientp;
163
164 switch (cmd) {
165 case CURLIOCMD_NOP:
166 return CURLIOE_OK;
167
168 case CURLIOCMD_RESTARTREAD:
169 buffer->posn = 0;
170 return CURLIOE_OK;
171
172 default:
173 return CURLIOE_UNKNOWNCMD;
174 }
175 }
176
177 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
178 {
179 size_t size = eltsize * nmemb;
180 struct strbuf *buffer = buffer_;
181
182 strbuf_add(buffer, ptr, size);
183 return nmemb;
184 }
185
186 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
187 {
188 return nmemb;
189 }
190
191 static void closedown_active_slot(struct active_request_slot *slot)
192 {
193 active_requests--;
194 slot->in_use = 0;
195 }
196
197 static void finish_active_slot(struct active_request_slot *slot)
198 {
199 closedown_active_slot(slot);
200 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
201
202 if (slot->finished)
203 (*slot->finished) = 1;
204
205 /* Store slot results so they can be read after the slot is reused */
206 if (slot->results) {
207 slot->results->curl_result = slot->curl_result;
208 slot->results->http_code = slot->http_code;
209 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
210 &slot->results->auth_avail);
211
212 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
213 &slot->results->http_connectcode);
214 }
215
216 /* Run callback if appropriate */
217 if (slot->callback_func)
218 slot->callback_func(slot->callback_data);
219 }
220
221 static void xmulti_remove_handle(struct active_request_slot *slot)
222 {
223 curl_multi_remove_handle(curlm, slot->curl);
224 }
225
226 static void process_curl_messages(void)
227 {
228 int num_messages;
229 struct active_request_slot *slot;
230 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
231
232 while (curl_message != NULL) {
233 if (curl_message->msg == CURLMSG_DONE) {
234 int curl_result = curl_message->data.result;
235 slot = active_queue_head;
236 while (slot != NULL &&
237 slot->curl != curl_message->easy_handle)
238 slot = slot->next;
239 if (slot) {
240 xmulti_remove_handle(slot);
241 slot->curl_result = curl_result;
242 finish_active_slot(slot);
243 } else {
244 fprintf(stderr, "Received DONE message for unknown request!\n");
245 }
246 } else {
247 fprintf(stderr, "Unknown CURL message received: %d\n",
248 (int)curl_message->msg);
249 }
250 curl_message = curl_multi_info_read(curlm, &num_messages);
251 }
252 }
253
254 static int http_options(const char *var, const char *value, void *cb)
255 {
256 if (!strcmp("http.version", var)) {
257 return git_config_string(&curl_http_version, var, value);
258 }
259 if (!strcmp("http.sslverify", var)) {
260 curl_ssl_verify = git_config_bool(var, value);
261 return 0;
262 }
263 if (!strcmp("http.sslcipherlist", var))
264 return git_config_string(&ssl_cipherlist, var, value);
265 if (!strcmp("http.sslversion", var))
266 return git_config_string(&ssl_version, var, value);
267 if (!strcmp("http.sslcert", var))
268 return git_config_pathname(&ssl_cert, var, value);
269 if (!strcmp("http.sslkey", var))
270 return git_config_pathname(&ssl_key, var, value);
271 if (!strcmp("http.sslcapath", var))
272 return git_config_pathname(&ssl_capath, var, value);
273 if (!strcmp("http.sslcainfo", var))
274 return git_config_pathname(&ssl_cainfo, var, value);
275 if (!strcmp("http.sslcertpasswordprotected", var)) {
276 ssl_cert_password_required = git_config_bool(var, value);
277 return 0;
278 }
279 if (!strcmp("http.ssltry", var)) {
280 curl_ssl_try = git_config_bool(var, value);
281 return 0;
282 }
283 if (!strcmp("http.sslbackend", var)) {
284 free(http_ssl_backend);
285 http_ssl_backend = xstrdup_or_null(value);
286 return 0;
287 }
288
289 if (!strcmp("http.schannelcheckrevoke", var)) {
290 http_schannel_check_revoke = git_config_bool(var, value);
291 return 0;
292 }
293
294 if (!strcmp("http.schannelusesslcainfo", var)) {
295 http_schannel_use_ssl_cainfo = git_config_bool(var, value);
296 return 0;
297 }
298
299 if (!strcmp("http.minsessions", var)) {
300 min_curl_sessions = git_config_int(var, value);
301 if (min_curl_sessions > 1)
302 min_curl_sessions = 1;
303 return 0;
304 }
305 if (!strcmp("http.maxrequests", var)) {
306 max_requests = git_config_int(var, value);
307 return 0;
308 }
309 if (!strcmp("http.lowspeedlimit", var)) {
310 curl_low_speed_limit = (long)git_config_int(var, value);
311 return 0;
312 }
313 if (!strcmp("http.lowspeedtime", var)) {
314 curl_low_speed_time = (long)git_config_int(var, value);
315 return 0;
316 }
317
318 if (!strcmp("http.noepsv", var)) {
319 curl_ftp_no_epsv = git_config_bool(var, value);
320 return 0;
321 }
322 if (!strcmp("http.proxy", var))
323 return git_config_string(&curl_http_proxy, var, value);
324
325 if (!strcmp("http.proxyauthmethod", var))
326 return git_config_string(&http_proxy_authmethod, var, value);
327
328 if (!strcmp("http.proxysslcert", var))
329 return git_config_string(&http_proxy_ssl_cert, var, value);
330
331 if (!strcmp("http.proxysslkey", var))
332 return git_config_string(&http_proxy_ssl_key, var, value);
333
334 if (!strcmp("http.proxysslcainfo", var))
335 return git_config_string(&http_proxy_ssl_ca_info, var, value);
336
337 if (!strcmp("http.proxysslcertpasswordprotected", var)) {
338 proxy_ssl_cert_password_required = git_config_bool(var, value);
339 return 0;
340 }
341
342 if (!strcmp("http.cookiefile", var))
343 return git_config_pathname(&curl_cookie_file, var, value);
344 if (!strcmp("http.savecookies", var)) {
345 curl_save_cookies = git_config_bool(var, value);
346 return 0;
347 }
348
349 if (!strcmp("http.postbuffer", var)) {
350 http_post_buffer = git_config_ssize_t(var, value);
351 if (http_post_buffer < 0)
352 warning(_("negative value for http.postBuffer; defaulting to %d"), LARGE_PACKET_MAX);
353 if (http_post_buffer < LARGE_PACKET_MAX)
354 http_post_buffer = LARGE_PACKET_MAX;
355 return 0;
356 }
357
358 if (!strcmp("http.useragent", var))
359 return git_config_string(&user_agent, var, value);
360
361 if (!strcmp("http.emptyauth", var)) {
362 if (value && !strcmp("auto", value))
363 curl_empty_auth = -1;
364 else
365 curl_empty_auth = git_config_bool(var, value);
366 return 0;
367 }
368
369 if (!strcmp("http.delegation", var)) {
370 #ifdef CURLGSSAPI_DELEGATION_FLAG
371 return git_config_string(&curl_deleg, var, value);
372 #else
373 warning(_("Delegation control is not supported with cURL < 7.22.0"));
374 return 0;
375 #endif
376 }
377
378 if (!strcmp("http.pinnedpubkey", var)) {
379 #ifdef GIT_CURL_HAVE_CURLOPT_PINNEDPUBLICKEY
380 return git_config_pathname(&ssl_pinnedkey, var, value);
381 #else
382 warning(_("Public key pinning not supported with cURL < 7.39.0"));
383 return 0;
384 #endif
385 }
386
387 if (!strcmp("http.extraheader", var)) {
388 if (!value) {
389 return config_error_nonbool(var);
390 } else if (!*value) {
391 string_list_clear(&extra_http_headers, 0);
392 } else {
393 string_list_append(&extra_http_headers, value);
394 }
395 return 0;
396 }
397
398 if (!strcmp("http.curloptresolve", var)) {
399 if (!value) {
400 return config_error_nonbool(var);
401 } else if (!*value) {
402 curl_slist_free_all(host_resolutions);
403 host_resolutions = NULL;
404 } else {
405 host_resolutions = curl_slist_append(host_resolutions, value);
406 }
407 return 0;
408 }
409
410 if (!strcmp("http.followredirects", var)) {
411 if (value && !strcmp(value, "initial"))
412 http_follow_config = HTTP_FOLLOW_INITIAL;
413 else if (git_config_bool(var, value))
414 http_follow_config = HTTP_FOLLOW_ALWAYS;
415 else
416 http_follow_config = HTTP_FOLLOW_NONE;
417 return 0;
418 }
419
420 /* Fall back on the default ones */
421 return git_default_config(var, value, cb);
422 }
423
424 static int curl_empty_auth_enabled(void)
425 {
426 if (curl_empty_auth >= 0)
427 return curl_empty_auth;
428
429 /*
430 * In the automatic case, kick in the empty-auth
431 * hack as long as we would potentially try some
432 * method more exotic than "Basic" or "Digest".
433 *
434 * But only do this when this is our second or
435 * subsequent request, as by then we know what
436 * methods are available.
437 */
438 if (http_auth_methods_restricted &&
439 (http_auth_methods & ~empty_auth_useless))
440 return 1;
441 return 0;
442 }
443
444 static void init_curl_http_auth(CURL *result)
445 {
446 if (!http_auth.username || !*http_auth.username) {
447 if (curl_empty_auth_enabled())
448 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
449 return;
450 }
451
452 credential_fill(&http_auth);
453
454 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
455 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
456 }
457
458 /* *var must be free-able */
459 static void var_override(const char **var, char *value)
460 {
461 if (value) {
462 free((void *)*var);
463 *var = xstrdup(value);
464 }
465 }
466
467 static void set_proxyauth_name_password(CURL *result)
468 {
469 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
470 proxy_auth.username);
471 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
472 proxy_auth.password);
473 }
474
475 static void init_curl_proxy_auth(CURL *result)
476 {
477 if (proxy_auth.username) {
478 if (!proxy_auth.password)
479 credential_fill(&proxy_auth);
480 set_proxyauth_name_password(result);
481 }
482
483 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
484
485 if (http_proxy_authmethod) {
486 int i;
487 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
488 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
489 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
490 proxy_authmethods[i].curlauth_param);
491 break;
492 }
493 }
494 if (i == ARRAY_SIZE(proxy_authmethods)) {
495 warning("unsupported proxy authentication method %s: using anyauth",
496 http_proxy_authmethod);
497 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
498 }
499 }
500 else
501 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
502 }
503
504 static int has_cert_password(void)
505 {
506 if (ssl_cert == NULL || ssl_cert_password_required != 1)
507 return 0;
508 if (!cert_auth.password) {
509 cert_auth.protocol = xstrdup("cert");
510 cert_auth.host = xstrdup("");
511 cert_auth.username = xstrdup("");
512 cert_auth.path = xstrdup(ssl_cert);
513 credential_fill(&cert_auth);
514 }
515 return 1;
516 }
517
518 #ifdef GIT_CURL_HAVE_CURLOPT_PROXY_KEYPASSWD
519 static int has_proxy_cert_password(void)
520 {
521 if (http_proxy_ssl_cert == NULL || proxy_ssl_cert_password_required != 1)
522 return 0;
523 if (!proxy_cert_auth.password) {
524 proxy_cert_auth.protocol = xstrdup("cert");
525 proxy_cert_auth.host = xstrdup("");
526 proxy_cert_auth.username = xstrdup("");
527 proxy_cert_auth.path = xstrdup(http_proxy_ssl_cert);
528 credential_fill(&proxy_cert_auth);
529 }
530 return 1;
531 }
532 #endif
533
534 #ifdef GITCURL_HAVE_CURLOPT_TCP_KEEPALIVE
535 static void set_curl_keepalive(CURL *c)
536 {
537 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
538 }
539
540 #else
541 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
542 {
543 int ka = 1;
544 int rc;
545 socklen_t len = (socklen_t)sizeof(ka);
546
547 if (type != CURLSOCKTYPE_IPCXN)
548 return 0;
549
550 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
551 if (rc < 0)
552 warning_errno("unable to set SO_KEEPALIVE on socket");
553
554 return CURL_SOCKOPT_OK;
555 }
556
557 static void set_curl_keepalive(CURL *c)
558 {
559 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
560 }
561 #endif
562
563 /* Return 1 if redactions have been made, 0 otherwise. */
564 static int redact_sensitive_header(struct strbuf *header, size_t offset)
565 {
566 int ret = 0;
567 const char *sensitive_header;
568
569 if (trace_curl_redact &&
570 (skip_iprefix(header->buf + offset, "Authorization:", &sensitive_header) ||
571 skip_iprefix(header->buf + offset, "Proxy-Authorization:", &sensitive_header))) {
572 /* The first token is the type, which is OK to log */
573 while (isspace(*sensitive_header))
574 sensitive_header++;
575 while (*sensitive_header && !isspace(*sensitive_header))
576 sensitive_header++;
577 /* Everything else is opaque and possibly sensitive */
578 strbuf_setlen(header, sensitive_header - header->buf);
579 strbuf_addstr(header, " <redacted>");
580 ret = 1;
581 } else if (trace_curl_redact &&
582 skip_iprefix(header->buf + offset, "Cookie:", &sensitive_header)) {
583 struct strbuf redacted_header = STRBUF_INIT;
584 const char *cookie;
585
586 while (isspace(*sensitive_header))
587 sensitive_header++;
588
589 cookie = sensitive_header;
590
591 while (cookie) {
592 char *equals;
593 char *semicolon = strstr(cookie, "; ");
594 if (semicolon)
595 *semicolon = 0;
596 equals = strchrnul(cookie, '=');
597 if (!equals) {
598 /* invalid cookie, just append and continue */
599 strbuf_addstr(&redacted_header, cookie);
600 continue;
601 }
602 strbuf_add(&redacted_header, cookie, equals - cookie);
603 strbuf_addstr(&redacted_header, "=<redacted>");
604 if (semicolon) {
605 /*
606 * There are more cookies. (Or, for some
607 * reason, the input string ends in "; ".)
608 */
609 strbuf_addstr(&redacted_header, "; ");
610 cookie = semicolon + strlen("; ");
611 } else {
612 cookie = NULL;
613 }
614 }
615
616 strbuf_setlen(header, sensitive_header - header->buf);
617 strbuf_addbuf(header, &redacted_header);
618 ret = 1;
619 }
620 return ret;
621 }
622
623 static int match_curl_h2_trace(const char *line, const char **out)
624 {
625 const char *p;
626
627 /*
628 * curl prior to 8.1.0 gives us:
629 *
630 * h2h3 [<header-name>: <header-val>]
631 *
632 * Starting in 8.1.0, the first token became just "h2".
633 */
634 if (skip_iprefix(line, "h2h3 [", out) ||
635 skip_iprefix(line, "h2 [", out))
636 return 1;
637
638 /*
639 * curl 8.3.0 uses:
640 * [HTTP/2] [<stream-id>] [<header-name>: <header-val>]
641 * where <stream-id> is numeric.
642 */
643 if (skip_iprefix(line, "[HTTP/2] [", &p)) {
644 while (isdigit(*p))
645 p++;
646 if (skip_prefix(p, "] [", out))
647 return 1;
648 }
649
650 return 0;
651 }
652
653 /* Redact headers in info */
654 static void redact_sensitive_info_header(struct strbuf *header)
655 {
656 const char *sensitive_header;
657
658 if (trace_curl_redact &&
659 match_curl_h2_trace(header->buf, &sensitive_header)) {
660 if (redact_sensitive_header(header, sensitive_header - header->buf)) {
661 /* redaction ate our closing bracket */
662 strbuf_addch(header, ']');
663 }
664 }
665 }
666
667 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
668 {
669 struct strbuf out = STRBUF_INIT;
670 struct strbuf **headers, **header;
671
672 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
673 text, (long)size, (long)size);
674 trace_strbuf(&trace_curl, &out);
675 strbuf_reset(&out);
676 strbuf_add(&out, ptr, size);
677 headers = strbuf_split_max(&out, '\n', 0);
678
679 for (header = headers; *header; header++) {
680 if (hide_sensitive_header)
681 redact_sensitive_header(*header, 0);
682 strbuf_insertstr((*header), 0, text);
683 strbuf_insertstr((*header), strlen(text), ": ");
684 strbuf_rtrim((*header));
685 strbuf_addch((*header), '\n');
686 trace_strbuf(&trace_curl, (*header));
687 }
688 strbuf_list_free(headers);
689 strbuf_release(&out);
690 }
691
692 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
693 {
694 size_t i;
695 struct strbuf out = STRBUF_INIT;
696 unsigned int width = 60;
697
698 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
699 text, (long)size, (long)size);
700 trace_strbuf(&trace_curl, &out);
701
702 for (i = 0; i < size; i += width) {
703 size_t w;
704
705 strbuf_reset(&out);
706 strbuf_addf(&out, "%s: ", text);
707 for (w = 0; (w < width) && (i + w < size); w++) {
708 unsigned char ch = ptr[i + w];
709
710 strbuf_addch(&out,
711 (ch >= 0x20) && (ch < 0x80)
712 ? ch : '.');
713 }
714 strbuf_addch(&out, '\n');
715 trace_strbuf(&trace_curl, &out);
716 }
717 strbuf_release(&out);
718 }
719
720 static void curl_dump_info(char *data, size_t size)
721 {
722 struct strbuf buf = STRBUF_INIT;
723
724 strbuf_add(&buf, data, size);
725
726 redact_sensitive_info_header(&buf);
727 trace_printf_key(&trace_curl, "== Info: %s", buf.buf);
728
729 strbuf_release(&buf);
730 }
731
732 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
733 {
734 const char *text;
735 enum { NO_FILTER = 0, DO_FILTER = 1 };
736
737 switch (type) {
738 case CURLINFO_TEXT:
739 curl_dump_info(data, size);
740 break;
741 case CURLINFO_HEADER_OUT:
742 text = "=> Send header";
743 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
744 break;
745 case CURLINFO_DATA_OUT:
746 if (trace_curl_data) {
747 text = "=> Send data";
748 curl_dump_data(text, (unsigned char *)data, size);
749 }
750 break;
751 case CURLINFO_SSL_DATA_OUT:
752 if (trace_curl_data) {
753 text = "=> Send SSL data";
754 curl_dump_data(text, (unsigned char *)data, size);
755 }
756 break;
757 case CURLINFO_HEADER_IN:
758 text = "<= Recv header";
759 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
760 break;
761 case CURLINFO_DATA_IN:
762 if (trace_curl_data) {
763 text = "<= Recv data";
764 curl_dump_data(text, (unsigned char *)data, size);
765 }
766 break;
767 case CURLINFO_SSL_DATA_IN:
768 if (trace_curl_data) {
769 text = "<= Recv SSL data";
770 curl_dump_data(text, (unsigned char *)data, size);
771 }
772 break;
773
774 default: /* we ignore unknown types by default */
775 return 0;
776 }
777 return 0;
778 }
779
780 void http_trace_curl_no_data(void)
781 {
782 trace_override_envvar(&trace_curl, "1");
783 trace_curl_data = 0;
784 }
785
786 void setup_curl_trace(CURL *handle)
787 {
788 if (!trace_want(&trace_curl))
789 return;
790 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
791 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
792 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
793 }
794
795 static long get_curl_allowed_protocols(int from_user)
796 {
797 long allowed_protocols = 0;
798
799 if (is_transport_allowed("http", from_user))
800 allowed_protocols |= CURLPROTO_HTTP;
801 if (is_transport_allowed("https", from_user))
802 allowed_protocols |= CURLPROTO_HTTPS;
803 if (is_transport_allowed("ftp", from_user))
804 allowed_protocols |= CURLPROTO_FTP;
805 if (is_transport_allowed("ftps", from_user))
806 allowed_protocols |= CURLPROTO_FTPS;
807
808 return allowed_protocols;
809 }
810
811 #ifdef GIT_CURL_HAVE_CURL_HTTP_VERSION_2
812 static int get_curl_http_version_opt(const char *version_string, long *opt)
813 {
814 int i;
815 static struct {
816 const char *name;
817 long opt_token;
818 } choice[] = {
819 { "HTTP/1.1", CURL_HTTP_VERSION_1_1 },
820 { "HTTP/2", CURL_HTTP_VERSION_2 }
821 };
822
823 for (i = 0; i < ARRAY_SIZE(choice); i++) {
824 if (!strcmp(version_string, choice[i].name)) {
825 *opt = choice[i].opt_token;
826 return 0;
827 }
828 }
829
830 warning("unknown value given to http.version: '%s'", version_string);
831 return -1; /* not found */
832 }
833
834 #endif
835
836 static CURL *get_curl_handle(void)
837 {
838 CURL *result = curl_easy_init();
839
840 if (!result)
841 die("curl_easy_init failed");
842
843 if (!curl_ssl_verify) {
844 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
845 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
846 } else {
847 /* Verify authenticity of the peer's certificate */
848 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
849 /* The name in the cert must match whom we tried to connect */
850 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
851 }
852
853 #ifdef GIT_CURL_HAVE_CURL_HTTP_VERSION_2
854 if (curl_http_version) {
855 long opt;
856 if (!get_curl_http_version_opt(curl_http_version, &opt)) {
857 /* Set request use http version */
858 curl_easy_setopt(result, CURLOPT_HTTP_VERSION, opt);
859 }
860 }
861 #endif
862
863 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
864 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
865
866 #ifdef CURLGSSAPI_DELEGATION_FLAG
867 if (curl_deleg) {
868 int i;
869 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
870 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
871 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
872 curl_deleg_levels[i].curl_deleg_param);
873 break;
874 }
875 }
876 if (i == ARRAY_SIZE(curl_deleg_levels))
877 warning("Unknown delegation method '%s': using default",
878 curl_deleg);
879 }
880 #endif
881
882 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
883 !http_schannel_check_revoke) {
884 #ifdef GIT_CURL_HAVE_CURLSSLOPT_NO_REVOKE
885 curl_easy_setopt(result, CURLOPT_SSL_OPTIONS, CURLSSLOPT_NO_REVOKE);
886 #else
887 warning(_("CURLSSLOPT_NO_REVOKE not supported with cURL < 7.44.0"));
888 #endif
889 }
890
891 if (http_proactive_auth)
892 init_curl_http_auth(result);
893
894 if (getenv("GIT_SSL_VERSION"))
895 ssl_version = getenv("GIT_SSL_VERSION");
896 if (ssl_version && *ssl_version) {
897 int i;
898 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
899 if (!strcmp(ssl_version, sslversions[i].name)) {
900 curl_easy_setopt(result, CURLOPT_SSLVERSION,
901 sslversions[i].ssl_version);
902 break;
903 }
904 }
905 if (i == ARRAY_SIZE(sslversions))
906 warning("unsupported ssl version %s: using default",
907 ssl_version);
908 }
909
910 if (getenv("GIT_SSL_CIPHER_LIST"))
911 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
912 if (ssl_cipherlist != NULL && *ssl_cipherlist)
913 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
914 ssl_cipherlist);
915
916 if (ssl_cert)
917 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
918 if (has_cert_password())
919 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
920 if (ssl_key)
921 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
922 if (ssl_capath)
923 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
924 #ifdef GIT_CURL_HAVE_CURLOPT_PINNEDPUBLICKEY
925 if (ssl_pinnedkey)
926 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
927 #endif
928 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
929 !http_schannel_use_ssl_cainfo) {
930 curl_easy_setopt(result, CURLOPT_CAINFO, NULL);
931 #ifdef GIT_CURL_HAVE_CURLOPT_PROXY_CAINFO
932 curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, NULL);
933 #endif
934 } else if (ssl_cainfo != NULL || http_proxy_ssl_ca_info != NULL) {
935 if (ssl_cainfo)
936 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
937 #ifdef GIT_CURL_HAVE_CURLOPT_PROXY_CAINFO
938 if (http_proxy_ssl_ca_info)
939 curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, http_proxy_ssl_ca_info);
940 #endif
941 }
942
943 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
944 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
945 curl_low_speed_limit);
946 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
947 curl_low_speed_time);
948 }
949
950 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
951 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
952 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
953 get_curl_allowed_protocols(0));
954 curl_easy_setopt(result, CURLOPT_PROTOCOLS,
955 get_curl_allowed_protocols(-1));
956 if (getenv("GIT_CURL_VERBOSE"))
957 http_trace_curl_no_data();
958 setup_curl_trace(result);
959 if (getenv("GIT_TRACE_CURL_NO_DATA"))
960 trace_curl_data = 0;
961 if (!git_env_bool("GIT_TRACE_REDACT", 1))
962 trace_curl_redact = 0;
963
964 curl_easy_setopt(result, CURLOPT_USERAGENT,
965 user_agent ? user_agent : git_user_agent());
966
967 if (curl_ftp_no_epsv)
968 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
969
970 if (curl_ssl_try)
971 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
972
973 /*
974 * CURL also examines these variables as a fallback; but we need to query
975 * them here in order to decide whether to prompt for missing password (cf.
976 * init_curl_proxy_auth()).
977 *
978 * Unlike many other common environment variables, these are historically
979 * lowercase only. It appears that CURL did not know this and implemented
980 * only uppercase variants, which was later corrected to take both - with
981 * the exception of http_proxy, which is lowercase only also in CURL. As
982 * the lowercase versions are the historical quasi-standard, they take
983 * precedence here, as in CURL.
984 */
985 if (!curl_http_proxy) {
986 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
987 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
988 var_override(&curl_http_proxy, getenv("https_proxy"));
989 } else {
990 var_override(&curl_http_proxy, getenv("http_proxy"));
991 }
992 if (!curl_http_proxy) {
993 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
994 var_override(&curl_http_proxy, getenv("all_proxy"));
995 }
996 }
997
998 if (curl_http_proxy && curl_http_proxy[0] == '\0') {
999 /*
1000 * Handle case with the empty http.proxy value here to keep
1001 * common code clean.
1002 * NB: empty option disables proxying at all.
1003 */
1004 curl_easy_setopt(result, CURLOPT_PROXY, "");
1005 } else if (curl_http_proxy) {
1006 if (starts_with(curl_http_proxy, "socks5h"))
1007 curl_easy_setopt(result,
1008 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
1009 else if (starts_with(curl_http_proxy, "socks5"))
1010 curl_easy_setopt(result,
1011 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
1012 else if (starts_with(curl_http_proxy, "socks4a"))
1013 curl_easy_setopt(result,
1014 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
1015 else if (starts_with(curl_http_proxy, "socks"))
1016 curl_easy_setopt(result,
1017 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
1018 #ifdef GIT_CURL_HAVE_CURLOPT_PROXY_KEYPASSWD
1019 else if (starts_with(curl_http_proxy, "https")) {
1020 curl_easy_setopt(result, CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
1021
1022 if (http_proxy_ssl_cert)
1023 curl_easy_setopt(result, CURLOPT_PROXY_SSLCERT, http_proxy_ssl_cert);
1024
1025 if (http_proxy_ssl_key)
1026 curl_easy_setopt(result, CURLOPT_PROXY_SSLKEY, http_proxy_ssl_key);
1027
1028 if (has_proxy_cert_password())
1029 curl_easy_setopt(result, CURLOPT_PROXY_KEYPASSWD, proxy_cert_auth.password);
1030 }
1031 #endif
1032 if (strstr(curl_http_proxy, "://"))
1033 credential_from_url(&proxy_auth, curl_http_proxy);
1034 else {
1035 struct strbuf url = STRBUF_INIT;
1036 strbuf_addf(&url, "http://%s", curl_http_proxy);
1037 credential_from_url(&proxy_auth, url.buf);
1038 strbuf_release(&url);
1039 }
1040
1041 if (!proxy_auth.host)
1042 die("Invalid proxy URL '%s'", curl_http_proxy);
1043
1044 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
1045 var_override(&curl_no_proxy, getenv("NO_PROXY"));
1046 var_override(&curl_no_proxy, getenv("no_proxy"));
1047 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
1048 }
1049 init_curl_proxy_auth(result);
1050
1051 set_curl_keepalive(result);
1052
1053 return result;
1054 }
1055
1056 static void set_from_env(const char **var, const char *envname)
1057 {
1058 const char *val = getenv(envname);
1059 if (val)
1060 *var = val;
1061 }
1062
1063 void http_init(struct remote *remote, const char *url, int proactive_auth)
1064 {
1065 char *low_speed_limit;
1066 char *low_speed_time;
1067 char *normalized_url;
1068 struct urlmatch_config config = URLMATCH_CONFIG_INIT;
1069
1070 config.section = "http";
1071 config.key = NULL;
1072 config.collect_fn = http_options;
1073 config.cascade_fn = git_default_config;
1074 config.cb = NULL;
1075
1076 http_is_verbose = 0;
1077 normalized_url = url_normalize(url, &config.url);
1078
1079 git_config(urlmatch_config_entry, &config);
1080 free(normalized_url);
1081 string_list_clear(&config.vars, 1);
1082
1083 #ifdef GIT_CURL_HAVE_CURLSSLSET_NO_BACKENDS
1084 if (http_ssl_backend) {
1085 const curl_ssl_backend **backends;
1086 struct strbuf buf = STRBUF_INIT;
1087 int i;
1088
1089 switch (curl_global_sslset(-1, http_ssl_backend, &backends)) {
1090 case CURLSSLSET_UNKNOWN_BACKEND:
1091 strbuf_addf(&buf, _("Unsupported SSL backend '%s'. "
1092 "Supported SSL backends:"),
1093 http_ssl_backend);
1094 for (i = 0; backends[i]; i++)
1095 strbuf_addf(&buf, "\n\t%s", backends[i]->name);
1096 die("%s", buf.buf);
1097 case CURLSSLSET_NO_BACKENDS:
1098 die(_("Could not set SSL backend to '%s': "
1099 "cURL was built without SSL backends"),
1100 http_ssl_backend);
1101 case CURLSSLSET_TOO_LATE:
1102 die(_("Could not set SSL backend to '%s': already set"),
1103 http_ssl_backend);
1104 case CURLSSLSET_OK:
1105 break; /* Okay! */
1106 }
1107 }
1108 #endif
1109
1110 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1111 die("curl_global_init failed");
1112
1113 http_proactive_auth = proactive_auth;
1114
1115 if (remote && remote->http_proxy)
1116 curl_http_proxy = xstrdup(remote->http_proxy);
1117
1118 if (remote)
1119 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
1120
1121 pragma_header = curl_slist_append(http_copy_default_headers(),
1122 "Pragma: no-cache");
1123 no_pragma_header = curl_slist_append(http_copy_default_headers(),
1124 "Pragma:");
1125
1126 {
1127 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1128 if (http_max_requests)
1129 max_requests = atoi(http_max_requests);
1130 }
1131
1132 curlm = curl_multi_init();
1133 if (!curlm)
1134 die("curl_multi_init failed");
1135
1136 if (getenv("GIT_SSL_NO_VERIFY"))
1137 curl_ssl_verify = 0;
1138
1139 set_from_env(&ssl_cert, "GIT_SSL_CERT");
1140 set_from_env(&ssl_key, "GIT_SSL_KEY");
1141 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
1142 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
1143
1144 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
1145
1146 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1147 if (low_speed_limit)
1148 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1149 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1150 if (low_speed_time)
1151 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1152
1153 if (curl_ssl_verify == -1)
1154 curl_ssl_verify = 1;
1155
1156 curl_session_count = 0;
1157 if (max_requests < 1)
1158 max_requests = DEFAULT_MAX_REQUESTS;
1159
1160 set_from_env(&http_proxy_ssl_cert, "GIT_PROXY_SSL_CERT");
1161 set_from_env(&http_proxy_ssl_key, "GIT_PROXY_SSL_KEY");
1162 set_from_env(&http_proxy_ssl_ca_info, "GIT_PROXY_SSL_CAINFO");
1163
1164 if (getenv("GIT_PROXY_SSL_CERT_PASSWORD_PROTECTED"))
1165 proxy_ssl_cert_password_required = 1;
1166
1167 if (getenv("GIT_CURL_FTP_NO_EPSV"))
1168 curl_ftp_no_epsv = 1;
1169
1170 if (url) {
1171 credential_from_url(&http_auth, url);
1172 if (!ssl_cert_password_required &&
1173 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1174 starts_with(url, "https://"))
1175 ssl_cert_password_required = 1;
1176 }
1177
1178 curl_default = get_curl_handle();
1179 }
1180
1181 void http_cleanup(void)
1182 {
1183 struct active_request_slot *slot = active_queue_head;
1184
1185 while (slot != NULL) {
1186 struct active_request_slot *next = slot->next;
1187 if (slot->curl) {
1188 xmulti_remove_handle(slot);
1189 curl_easy_cleanup(slot->curl);
1190 }
1191 free(slot);
1192 slot = next;
1193 }
1194 active_queue_head = NULL;
1195
1196 curl_easy_cleanup(curl_default);
1197
1198 curl_multi_cleanup(curlm);
1199 curl_global_cleanup();
1200
1201 string_list_clear(&extra_http_headers, 0);
1202
1203 curl_slist_free_all(pragma_header);
1204 pragma_header = NULL;
1205
1206 curl_slist_free_all(no_pragma_header);
1207 no_pragma_header = NULL;
1208
1209 curl_slist_free_all(host_resolutions);
1210 host_resolutions = NULL;
1211
1212 if (curl_http_proxy) {
1213 free((void *)curl_http_proxy);
1214 curl_http_proxy = NULL;
1215 }
1216
1217 if (proxy_auth.password) {
1218 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1219 FREE_AND_NULL(proxy_auth.password);
1220 }
1221
1222 free((void *)curl_proxyuserpwd);
1223 curl_proxyuserpwd = NULL;
1224
1225 free((void *)http_proxy_authmethod);
1226 http_proxy_authmethod = NULL;
1227
1228 if (cert_auth.password) {
1229 memset(cert_auth.password, 0, strlen(cert_auth.password));
1230 FREE_AND_NULL(cert_auth.password);
1231 }
1232 ssl_cert_password_required = 0;
1233
1234 if (proxy_cert_auth.password) {
1235 memset(proxy_cert_auth.password, 0, strlen(proxy_cert_auth.password));
1236 FREE_AND_NULL(proxy_cert_auth.password);
1237 }
1238 proxy_ssl_cert_password_required = 0;
1239
1240 FREE_AND_NULL(cached_accept_language);
1241 }
1242
1243 struct active_request_slot *get_active_slot(void)
1244 {
1245 struct active_request_slot *slot = active_queue_head;
1246 struct active_request_slot *newslot;
1247
1248 int num_transfers;
1249
1250 /* Wait for a slot to open up if the queue is full */
1251 while (active_requests >= max_requests) {
1252 curl_multi_perform(curlm, &num_transfers);
1253 if (num_transfers < active_requests)
1254 process_curl_messages();
1255 }
1256
1257 while (slot != NULL && slot->in_use)
1258 slot = slot->next;
1259
1260 if (!slot) {
1261 newslot = xmalloc(sizeof(*newslot));
1262 newslot->curl = NULL;
1263 newslot->in_use = 0;
1264 newslot->next = NULL;
1265
1266 slot = active_queue_head;
1267 if (!slot) {
1268 active_queue_head = newslot;
1269 } else {
1270 while (slot->next != NULL)
1271 slot = slot->next;
1272 slot->next = newslot;
1273 }
1274 slot = newslot;
1275 }
1276
1277 if (!slot->curl) {
1278 slot->curl = curl_easy_duphandle(curl_default);
1279 curl_session_count++;
1280 }
1281
1282 active_requests++;
1283 slot->in_use = 1;
1284 slot->results = NULL;
1285 slot->finished = NULL;
1286 slot->callback_data = NULL;
1287 slot->callback_func = NULL;
1288 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1289 if (curl_save_cookies)
1290 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1291 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1292 curl_easy_setopt(slot->curl, CURLOPT_RESOLVE, host_resolutions);
1293 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1294 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1295 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1296 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1297 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1298 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1299 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1300 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1301 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1302
1303 /*
1304 * Default following to off unless "ALWAYS" is configured; this gives
1305 * callers a sane starting point, and they can tweak for individual
1306 * HTTP_FOLLOW_* cases themselves.
1307 */
1308 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1309 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1310 else
1311 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1312
1313 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1314 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1315 if (http_auth.password || curl_empty_auth_enabled())
1316 init_curl_http_auth(slot->curl);
1317
1318 return slot;
1319 }
1320
1321 int start_active_slot(struct active_request_slot *slot)
1322 {
1323 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1324 int num_transfers;
1325
1326 if (curlm_result != CURLM_OK &&
1327 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1328 warning("curl_multi_add_handle failed: %s",
1329 curl_multi_strerror(curlm_result));
1330 active_requests--;
1331 slot->in_use = 0;
1332 return 0;
1333 }
1334
1335 /*
1336 * We know there must be something to do, since we just added
1337 * something.
1338 */
1339 curl_multi_perform(curlm, &num_transfers);
1340 return 1;
1341 }
1342
1343 struct fill_chain {
1344 void *data;
1345 int (*fill)(void *);
1346 struct fill_chain *next;
1347 };
1348
1349 static struct fill_chain *fill_cfg;
1350
1351 void add_fill_function(void *data, int (*fill)(void *))
1352 {
1353 struct fill_chain *new_fill = xmalloc(sizeof(*new_fill));
1354 struct fill_chain **linkp = &fill_cfg;
1355 new_fill->data = data;
1356 new_fill->fill = fill;
1357 new_fill->next = NULL;
1358 while (*linkp)
1359 linkp = &(*linkp)->next;
1360 *linkp = new_fill;
1361 }
1362
1363 void fill_active_slots(void)
1364 {
1365 struct active_request_slot *slot = active_queue_head;
1366
1367 while (active_requests < max_requests) {
1368 struct fill_chain *fill;
1369 for (fill = fill_cfg; fill; fill = fill->next)
1370 if (fill->fill(fill->data))
1371 break;
1372
1373 if (!fill)
1374 break;
1375 }
1376
1377 while (slot != NULL) {
1378 if (!slot->in_use && slot->curl != NULL
1379 && curl_session_count > min_curl_sessions) {
1380 curl_easy_cleanup(slot->curl);
1381 slot->curl = NULL;
1382 curl_session_count--;
1383 }
1384 slot = slot->next;
1385 }
1386 }
1387
1388 void step_active_slots(void)
1389 {
1390 int num_transfers;
1391 CURLMcode curlm_result;
1392
1393 do {
1394 curlm_result = curl_multi_perform(curlm, &num_transfers);
1395 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1396 if (num_transfers < active_requests) {
1397 process_curl_messages();
1398 fill_active_slots();
1399 }
1400 }
1401
1402 void run_active_slot(struct active_request_slot *slot)
1403 {
1404 fd_set readfds;
1405 fd_set writefds;
1406 fd_set excfds;
1407 int max_fd;
1408 struct timeval select_timeout;
1409 int finished = 0;
1410
1411 slot->finished = &finished;
1412 while (!finished) {
1413 step_active_slots();
1414
1415 if (slot->in_use) {
1416 long curl_timeout;
1417 curl_multi_timeout(curlm, &curl_timeout);
1418 if (curl_timeout == 0) {
1419 continue;
1420 } else if (curl_timeout == -1) {
1421 select_timeout.tv_sec = 0;
1422 select_timeout.tv_usec = 50000;
1423 } else {
1424 select_timeout.tv_sec = curl_timeout / 1000;
1425 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1426 }
1427
1428 max_fd = -1;
1429 FD_ZERO(&readfds);
1430 FD_ZERO(&writefds);
1431 FD_ZERO(&excfds);
1432 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1433
1434 /*
1435 * It can happen that curl_multi_timeout returns a pathologically
1436 * long timeout when curl_multi_fdset returns no file descriptors
1437 * to read. See commit message for more details.
1438 */
1439 if (max_fd < 0 &&
1440 (select_timeout.tv_sec > 0 ||
1441 select_timeout.tv_usec > 50000)) {
1442 select_timeout.tv_sec = 0;
1443 select_timeout.tv_usec = 50000;
1444 }
1445
1446 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1447 }
1448 }
1449
1450 /*
1451 * The value of slot->finished we set before the loop was used
1452 * to set our "finished" variable when our request completed.
1453 *
1454 * 1. The slot may not have been reused for another requst
1455 * yet, in which case it still has &finished.
1456 *
1457 * 2. The slot may already be in-use to serve another request,
1458 * which can further be divided into two cases:
1459 *
1460 * (a) If call run_active_slot() hasn't been called for that
1461 * other request, slot->finished would have been cleared
1462 * by get_active_slot() and has NULL.
1463 *
1464 * (b) If the request did call run_active_slot(), then the
1465 * call would have updated slot->finished at the beginning
1466 * of this function, and with the clearing of the member
1467 * below, we would find that slot->finished is now NULL.
1468 *
1469 * In all cases, slot->finished has no useful information to
1470 * anybody at this point. Some compilers warn us for
1471 * attempting to smuggle a pointer that is about to become
1472 * invalid, i.e. &finished. We clear it here to assure them.
1473 */
1474 slot->finished = NULL;
1475 }
1476
1477 static void release_active_slot(struct active_request_slot *slot)
1478 {
1479 closedown_active_slot(slot);
1480 if (slot->curl) {
1481 xmulti_remove_handle(slot);
1482 if (curl_session_count > min_curl_sessions) {
1483 curl_easy_cleanup(slot->curl);
1484 slot->curl = NULL;
1485 curl_session_count--;
1486 }
1487 }
1488 fill_active_slots();
1489 }
1490
1491 void finish_all_active_slots(void)
1492 {
1493 struct active_request_slot *slot = active_queue_head;
1494
1495 while (slot != NULL)
1496 if (slot->in_use) {
1497 run_active_slot(slot);
1498 slot = active_queue_head;
1499 } else {
1500 slot = slot->next;
1501 }
1502 }
1503
1504 /* Helpers for modifying and creating URLs */
1505 static inline int needs_quote(int ch)
1506 {
1507 if (((ch >= 'A') && (ch <= 'Z'))
1508 || ((ch >= 'a') && (ch <= 'z'))
1509 || ((ch >= '0') && (ch <= '9'))
1510 || (ch == '/')
1511 || (ch == '-')
1512 || (ch == '.'))
1513 return 0;
1514 return 1;
1515 }
1516
1517 static char *quote_ref_url(const char *base, const char *ref)
1518 {
1519 struct strbuf buf = STRBUF_INIT;
1520 const char *cp;
1521 int ch;
1522
1523 end_url_with_slash(&buf, base);
1524
1525 for (cp = ref; (ch = *cp) != 0; cp++)
1526 if (needs_quote(ch))
1527 strbuf_addf(&buf, "%%%02x", ch);
1528 else
1529 strbuf_addch(&buf, *cp);
1530
1531 return strbuf_detach(&buf, NULL);
1532 }
1533
1534 void append_remote_object_url(struct strbuf *buf, const char *url,
1535 const char *hex,
1536 int only_two_digit_prefix)
1537 {
1538 end_url_with_slash(buf, url);
1539
1540 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1541 if (!only_two_digit_prefix)
1542 strbuf_addstr(buf, hex + 2);
1543 }
1544
1545 char *get_remote_object_url(const char *url, const char *hex,
1546 int only_two_digit_prefix)
1547 {
1548 struct strbuf buf = STRBUF_INIT;
1549 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1550 return strbuf_detach(&buf, NULL);
1551 }
1552
1553 void normalize_curl_result(CURLcode *result, long http_code,
1554 char *errorstr, size_t errorlen)
1555 {
1556 /*
1557 * If we see a failing http code with CURLE_OK, we have turned off
1558 * FAILONERROR (to keep the server's custom error response), and should
1559 * translate the code into failure here.
1560 *
1561 * Likewise, if we see a redirect (30x code), that means we turned off
1562 * redirect-following, and we should treat the result as an error.
1563 */
1564 if (*result == CURLE_OK && http_code >= 300) {
1565 *result = CURLE_HTTP_RETURNED_ERROR;
1566 /*
1567 * Normally curl will already have put the "reason phrase"
1568 * from the server into curl_errorstr; unfortunately without
1569 * FAILONERROR it is lost, so we can give only the numeric
1570 * status code.
1571 */
1572 xsnprintf(errorstr, errorlen,
1573 "The requested URL returned error: %ld",
1574 http_code);
1575 }
1576 }
1577
1578 static int handle_curl_result(struct slot_results *results)
1579 {
1580 normalize_curl_result(&results->curl_result, results->http_code,
1581 curl_errorstr, sizeof(curl_errorstr));
1582
1583 if (results->curl_result == CURLE_OK) {
1584 credential_approve(&http_auth);
1585 credential_approve(&proxy_auth);
1586 credential_approve(&cert_auth);
1587 return HTTP_OK;
1588 } else if (results->curl_result == CURLE_SSL_CERTPROBLEM) {
1589 /*
1590 * We can't tell from here whether it's a bad path, bad
1591 * certificate, bad password, or something else wrong
1592 * with the certificate. So we reject the credential to
1593 * avoid caching or saving a bad password.
1594 */
1595 credential_reject(&cert_auth);
1596 return HTTP_NOAUTH;
1597 #ifdef GIT_CURL_HAVE_CURLE_SSL_PINNEDPUBKEYNOTMATCH
1598 } else if (results->curl_result == CURLE_SSL_PINNEDPUBKEYNOTMATCH) {
1599 return HTTP_NOMATCHPUBLICKEY;
1600 #endif
1601 } else if (missing_target(results))
1602 return HTTP_MISSING_TARGET;
1603 else if (results->http_code == 401) {
1604 if (http_auth.username && http_auth.password) {
1605 credential_reject(&http_auth);
1606 return HTTP_NOAUTH;
1607 } else {
1608 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1609 if (results->auth_avail) {
1610 http_auth_methods &= results->auth_avail;
1611 http_auth_methods_restricted = 1;
1612 }
1613 return HTTP_REAUTH;
1614 }
1615 } else {
1616 if (results->http_connectcode == 407)
1617 credential_reject(&proxy_auth);
1618 if (!curl_errorstr[0])
1619 strlcpy(curl_errorstr,
1620 curl_easy_strerror(results->curl_result),
1621 sizeof(curl_errorstr));
1622 return HTTP_ERROR;
1623 }
1624 }
1625
1626 int run_one_slot(struct active_request_slot *slot,
1627 struct slot_results *results)
1628 {
1629 slot->results = results;
1630 if (!start_active_slot(slot)) {
1631 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1632 "failed to start HTTP request");
1633 return HTTP_START_FAILED;
1634 }
1635
1636 run_active_slot(slot);
1637 return handle_curl_result(results);
1638 }
1639
1640 struct curl_slist *http_copy_default_headers(void)
1641 {
1642 struct curl_slist *headers = NULL;
1643 const struct string_list_item *item;
1644
1645 for_each_string_list_item(item, &extra_http_headers)
1646 headers = curl_slist_append(headers, item->string);
1647
1648 return headers;
1649 }
1650
1651 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1652 {
1653 char *ptr;
1654 CURLcode ret;
1655
1656 strbuf_reset(buf);
1657 ret = curl_easy_getinfo(curl, info, &ptr);
1658 if (!ret && ptr)
1659 strbuf_addstr(buf, ptr);
1660 return ret;
1661 }
1662
1663 /*
1664 * Check for and extract a content-type parameter. "raw"
1665 * should be positioned at the start of the potential
1666 * parameter, with any whitespace already removed.
1667 *
1668 * "name" is the name of the parameter. The value is appended
1669 * to "out".
1670 */
1671 static int extract_param(const char *raw, const char *name,
1672 struct strbuf *out)
1673 {
1674 size_t len = strlen(name);
1675
1676 if (strncasecmp(raw, name, len))
1677 return -1;
1678 raw += len;
1679
1680 if (*raw != '=')
1681 return -1;
1682 raw++;
1683
1684 while (*raw && !isspace(*raw) && *raw != ';')
1685 strbuf_addch(out, *raw++);
1686 return 0;
1687 }
1688
1689 /*
1690 * Extract a normalized version of the content type, with any
1691 * spaces suppressed, all letters lowercased, and no trailing ";"
1692 * or parameters.
1693 *
1694 * Note that we will silently remove even invalid whitespace. For
1695 * example, "text / plain" is specifically forbidden by RFC 2616,
1696 * but "text/plain" is the only reasonable output, and this keeps
1697 * our code simple.
1698 *
1699 * If the "charset" argument is not NULL, store the value of any
1700 * charset parameter there.
1701 *
1702 * Example:
1703 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1704 * "text / plain" -> "text/plain"
1705 */
1706 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1707 struct strbuf *charset)
1708 {
1709 const char *p;
1710
1711 strbuf_reset(type);
1712 strbuf_grow(type, raw->len);
1713 for (p = raw->buf; *p; p++) {
1714 if (isspace(*p))
1715 continue;
1716 if (*p == ';') {
1717 p++;
1718 break;
1719 }
1720 strbuf_addch(type, tolower(*p));
1721 }
1722
1723 if (!charset)
1724 return;
1725
1726 strbuf_reset(charset);
1727 while (*p) {
1728 while (isspace(*p) || *p == ';')
1729 p++;
1730 if (!extract_param(p, "charset", charset))
1731 return;
1732 while (*p && !isspace(*p))
1733 p++;
1734 }
1735
1736 if (!charset->len && starts_with(type->buf, "text/"))
1737 strbuf_addstr(charset, "ISO-8859-1");
1738 }
1739
1740 static void write_accept_language(struct strbuf *buf)
1741 {
1742 /*
1743 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1744 * that, q-value will be smaller than 0.001, the minimum q-value the
1745 * HTTP specification allows. See
1746 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1747 */
1748 const int MAX_DECIMAL_PLACES = 3;
1749 const int MAX_LANGUAGE_TAGS = 1000;
1750 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1751 char **language_tags = NULL;
1752 int num_langs = 0;
1753 const char *s = get_preferred_languages();
1754 int i;
1755 struct strbuf tag = STRBUF_INIT;
1756
1757 /* Don't add Accept-Language header if no language is preferred. */
1758 if (!s)
1759 return;
1760
1761 /*
1762 * Split the colon-separated string of preferred languages into
1763 * language_tags array.
1764 */
1765 do {
1766 /* collect language tag */
1767 for (; *s && (isalnum(*s) || *s == '_'); s++)
1768 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1769
1770 /* skip .codeset, @modifier and any other unnecessary parts */
1771 while (*s && *s != ':')
1772 s++;
1773
1774 if (tag.len) {
1775 num_langs++;
1776 REALLOC_ARRAY(language_tags, num_langs);
1777 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1778 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1779 break;
1780 }
1781 } while (*s++);
1782
1783 /* write Accept-Language header into buf */
1784 if (num_langs) {
1785 int last_buf_len = 0;
1786 int max_q;
1787 int decimal_places;
1788 char q_format[32];
1789
1790 /* add '*' */
1791 REALLOC_ARRAY(language_tags, num_langs + 1);
1792 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1793
1794 /* compute decimal_places */
1795 for (max_q = 1, decimal_places = 0;
1796 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1797 decimal_places++, max_q *= 10)
1798 ;
1799
1800 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1801
1802 strbuf_addstr(buf, "Accept-Language: ");
1803
1804 for (i = 0; i < num_langs; i++) {
1805 if (i > 0)
1806 strbuf_addstr(buf, ", ");
1807
1808 strbuf_addstr(buf, language_tags[i]);
1809
1810 if (i > 0)
1811 strbuf_addf(buf, q_format, max_q - i);
1812
1813 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1814 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1815 break;
1816 }
1817
1818 last_buf_len = buf->len;
1819 }
1820 }
1821
1822 /* free language tags -- last one is a static '*' */
1823 for (i = 0; i < num_langs - 1; i++)
1824 free(language_tags[i]);
1825 free(language_tags);
1826 }
1827
1828 /*
1829 * Get an Accept-Language header which indicates user's preferred languages.
1830 *
1831 * Examples:
1832 * LANGUAGE= -> ""
1833 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1834 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1835 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1836 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1837 * LANGUAGE= LANG=C -> ""
1838 */
1839 const char *http_get_accept_language_header(void)
1840 {
1841 if (!cached_accept_language) {
1842 struct strbuf buf = STRBUF_INIT;
1843 write_accept_language(&buf);
1844 if (buf.len > 0)
1845 cached_accept_language = strbuf_detach(&buf, NULL);
1846 }
1847
1848 return cached_accept_language;
1849 }
1850
1851 static void http_opt_request_remainder(CURL *curl, off_t pos)
1852 {
1853 char buf[128];
1854 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1855 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1856 }
1857
1858 /* http_request() targets */
1859 #define HTTP_REQUEST_STRBUF 0
1860 #define HTTP_REQUEST_FILE 1
1861
1862 static int http_request(const char *url,
1863 void *result, int target,
1864 const struct http_get_options *options)
1865 {
1866 struct active_request_slot *slot;
1867 struct slot_results results;
1868 struct curl_slist *headers = http_copy_default_headers();
1869 struct strbuf buf = STRBUF_INIT;
1870 const char *accept_language;
1871 int ret;
1872
1873 slot = get_active_slot();
1874 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1875
1876 if (!result) {
1877 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1878 } else {
1879 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1880 curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, result);
1881
1882 if (target == HTTP_REQUEST_FILE) {
1883 off_t posn = ftello(result);
1884 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1885 fwrite);
1886 if (posn > 0)
1887 http_opt_request_remainder(slot->curl, posn);
1888 } else
1889 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1890 fwrite_buffer);
1891 }
1892
1893 accept_language = http_get_accept_language_header();
1894
1895 if (accept_language)
1896 headers = curl_slist_append(headers, accept_language);
1897
1898 strbuf_addstr(&buf, "Pragma:");
1899 if (options && options->no_cache)
1900 strbuf_addstr(&buf, " no-cache");
1901 if (options && options->initial_request &&
1902 http_follow_config == HTTP_FOLLOW_INITIAL)
1903 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1904
1905 headers = curl_slist_append(headers, buf.buf);
1906
1907 /* Add additional headers here */
1908 if (options && options->extra_headers) {
1909 const struct string_list_item *item;
1910 for_each_string_list_item(item, options->extra_headers) {
1911 headers = curl_slist_append(headers, item->string);
1912 }
1913 }
1914
1915 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1916 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1917 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1918 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1919
1920 ret = run_one_slot(slot, &results);
1921
1922 if (options && options->content_type) {
1923 struct strbuf raw = STRBUF_INIT;
1924 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1925 extract_content_type(&raw, options->content_type,
1926 options->charset);
1927 strbuf_release(&raw);
1928 }
1929
1930 if (options && options->effective_url)
1931 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1932 options->effective_url);
1933
1934 curl_slist_free_all(headers);
1935 strbuf_release(&buf);
1936
1937 return ret;
1938 }
1939
1940 /*
1941 * Update the "base" url to a more appropriate value, as deduced by
1942 * redirects seen when requesting a URL starting with "url".
1943 *
1944 * The "asked" parameter is a URL that we asked curl to access, and must begin
1945 * with "base".
1946 *
1947 * The "got" parameter is the URL that curl reported to us as where we ended
1948 * up.
1949 *
1950 * Returns 1 if we updated the base url, 0 otherwise.
1951 *
1952 * Our basic strategy is to compare "base" and "asked" to find the bits
1953 * specific to our request. We then strip those bits off of "got" to yield the
1954 * new base. So for example, if our base is "http://example.com/foo.git",
1955 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1956 * with "https://other.example.com/foo.git/info/refs". We would want the
1957 * new URL to become "https://other.example.com/foo.git".
1958 *
1959 * Note that this assumes a sane redirect scheme. It's entirely possible
1960 * in the example above to end up at a URL that does not even end in
1961 * "info/refs". In such a case we die. There's not much we can do, such a
1962 * scheme is unlikely to represent a real git repository, and failing to
1963 * rewrite the base opens options for malicious redirects to do funny things.
1964 */
1965 static int update_url_from_redirect(struct strbuf *base,
1966 const char *asked,
1967 const struct strbuf *got)
1968 {
1969 const char *tail;
1970 size_t new_len;
1971
1972 if (!strcmp(asked, got->buf))
1973 return 0;
1974
1975 if (!skip_prefix(asked, base->buf, &tail))
1976 BUG("update_url_from_redirect: %s is not a superset of %s",
1977 asked, base->buf);
1978
1979 new_len = got->len;
1980 if (!strip_suffix_mem(got->buf, &new_len, tail))
1981 die(_("unable to update url base from redirection:\n"
1982 " asked for: %s\n"
1983 " redirect: %s"),
1984 asked, got->buf);
1985
1986 strbuf_reset(base);
1987 strbuf_add(base, got->buf, new_len);
1988
1989 return 1;
1990 }
1991
1992 static int http_request_reauth(const char *url,
1993 void *result, int target,
1994 struct http_get_options *options)
1995 {
1996 int ret = http_request(url, result, target, options);
1997
1998 if (ret != HTTP_OK && ret != HTTP_REAUTH)
1999 return ret;
2000
2001 if (options && options->effective_url && options->base_url) {
2002 if (update_url_from_redirect(options->base_url,
2003 url, options->effective_url)) {
2004 credential_from_url(&http_auth, options->base_url->buf);
2005 url = options->effective_url->buf;
2006 }
2007 }
2008
2009 if (ret != HTTP_REAUTH)
2010 return ret;
2011
2012 /*
2013 * The previous request may have put cruft into our output stream; we
2014 * should clear it out before making our next request.
2015 */
2016 switch (target) {
2017 case HTTP_REQUEST_STRBUF:
2018 strbuf_reset(result);
2019 break;
2020 case HTTP_REQUEST_FILE:
2021 if (fflush(result)) {
2022 error_errno("unable to flush a file");
2023 return HTTP_START_FAILED;
2024 }
2025 rewind(result);
2026 if (ftruncate(fileno(result), 0) < 0) {
2027 error_errno("unable to truncate a file");
2028 return HTTP_START_FAILED;
2029 }
2030 break;
2031 default:
2032 BUG("Unknown http_request target");
2033 }
2034
2035 credential_fill(&http_auth);
2036
2037 return http_request(url, result, target, options);
2038 }
2039
2040 int http_get_strbuf(const char *url,
2041 struct strbuf *result,
2042 struct http_get_options *options)
2043 {
2044 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
2045 }
2046
2047 /*
2048 * Downloads a URL and stores the result in the given file.
2049 *
2050 * If a previous interrupted download is detected (i.e. a previous temporary
2051 * file is still around) the download is resumed.
2052 */
2053 int http_get_file(const char *url, const char *filename,
2054 struct http_get_options *options)
2055 {
2056 int ret;
2057 struct strbuf tmpfile = STRBUF_INIT;
2058 FILE *result;
2059
2060 strbuf_addf(&tmpfile, "%s.temp", filename);
2061 result = fopen(tmpfile.buf, "a");
2062 if (!result) {
2063 error("Unable to open local file %s", tmpfile.buf);
2064 ret = HTTP_ERROR;
2065 goto cleanup;
2066 }
2067
2068 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
2069 fclose(result);
2070
2071 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
2072 ret = HTTP_ERROR;
2073 cleanup:
2074 strbuf_release(&tmpfile);
2075 return ret;
2076 }
2077
2078 int http_fetch_ref(const char *base, struct ref *ref)
2079 {
2080 struct http_get_options options = {0};
2081 char *url;
2082 struct strbuf buffer = STRBUF_INIT;
2083 int ret = -1;
2084
2085 options.no_cache = 1;
2086
2087 url = quote_ref_url(base, ref->name);
2088 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
2089 strbuf_rtrim(&buffer);
2090 if (buffer.len == the_hash_algo->hexsz)
2091 ret = get_oid_hex(buffer.buf, &ref->old_oid);
2092 else if (starts_with(buffer.buf, "ref: ")) {
2093 ref->symref = xstrdup(buffer.buf + 5);
2094 ret = 0;
2095 }
2096 }
2097
2098 strbuf_release(&buffer);
2099 free(url);
2100 return ret;
2101 }
2102
2103 /* Helpers for fetching packs */
2104 static char *fetch_pack_index(unsigned char *hash, const char *base_url)
2105 {
2106 char *url, *tmp;
2107 struct strbuf buf = STRBUF_INIT;
2108
2109 if (http_is_verbose)
2110 fprintf(stderr, "Getting index for pack %s\n", hash_to_hex(hash));
2111
2112 end_url_with_slash(&buf, base_url);
2113 strbuf_addf(&buf, "objects/pack/pack-%s.idx", hash_to_hex(hash));
2114 url = strbuf_detach(&buf, NULL);
2115
2116 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(hash));
2117 tmp = strbuf_detach(&buf, NULL);
2118
2119 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
2120 error("Unable to get pack index %s", url);
2121 FREE_AND_NULL(tmp);
2122 }
2123
2124 free(url);
2125 return tmp;
2126 }
2127
2128 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
2129 unsigned char *sha1, const char *base_url)
2130 {
2131 struct packed_git *new_pack;
2132 char *tmp_idx = NULL;
2133 int ret;
2134
2135 if (has_pack_index(sha1)) {
2136 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
2137 if (!new_pack)
2138 return -1; /* parse_pack_index() already issued error message */
2139 goto add_pack;
2140 }
2141
2142 tmp_idx = fetch_pack_index(sha1, base_url);
2143 if (!tmp_idx)
2144 return -1;
2145
2146 new_pack = parse_pack_index(sha1, tmp_idx);
2147 if (!new_pack) {
2148 unlink(tmp_idx);
2149 free(tmp_idx);
2150
2151 return -1; /* parse_pack_index() already issued error message */
2152 }
2153
2154 ret = verify_pack_index(new_pack);
2155 if (!ret) {
2156 close_pack_index(new_pack);
2157 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
2158 }
2159 free(tmp_idx);
2160 if (ret)
2161 return -1;
2162
2163 add_pack:
2164 new_pack->next = *packs_head;
2165 *packs_head = new_pack;
2166 return 0;
2167 }
2168
2169 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
2170 {
2171 struct http_get_options options = {0};
2172 int ret = 0;
2173 char *url;
2174 const char *data;
2175 struct strbuf buf = STRBUF_INIT;
2176 struct object_id oid;
2177
2178 end_url_with_slash(&buf, base_url);
2179 strbuf_addstr(&buf, "objects/info/packs");
2180 url = strbuf_detach(&buf, NULL);
2181
2182 options.no_cache = 1;
2183 ret = http_get_strbuf(url, &buf, &options);
2184 if (ret != HTTP_OK)
2185 goto cleanup;
2186
2187 data = buf.buf;
2188 while (*data) {
2189 if (skip_prefix(data, "P pack-", &data) &&
2190 !parse_oid_hex(data, &oid, &data) &&
2191 skip_prefix(data, ".pack", &data) &&
2192 (*data == '\n' || *data == '\0')) {
2193 fetch_and_setup_pack_index(packs_head, oid.hash, base_url);
2194 } else {
2195 data = strchrnul(data, '\n');
2196 }
2197 if (*data)
2198 data++; /* skip past newline */
2199 }
2200
2201 cleanup:
2202 free(url);
2203 return ret;
2204 }
2205
2206 void release_http_pack_request(struct http_pack_request *preq)
2207 {
2208 if (preq->packfile) {
2209 fclose(preq->packfile);
2210 preq->packfile = NULL;
2211 }
2212 preq->slot = NULL;
2213 strbuf_release(&preq->tmpfile);
2214 free(preq->url);
2215 free(preq);
2216 }
2217
2218 static const char *default_index_pack_args[] =
2219 {"index-pack", "--stdin", NULL};
2220
2221 int finish_http_pack_request(struct http_pack_request *preq)
2222 {
2223 struct child_process ip = CHILD_PROCESS_INIT;
2224 int tmpfile_fd;
2225 int ret = 0;
2226
2227 fclose(preq->packfile);
2228 preq->packfile = NULL;
2229
2230 tmpfile_fd = xopen(preq->tmpfile.buf, O_RDONLY);
2231
2232 ip.git_cmd = 1;
2233 ip.in = tmpfile_fd;
2234 strvec_pushv(&ip.args, preq->index_pack_args ?
2235 preq->index_pack_args :
2236 default_index_pack_args);
2237
2238 if (preq->preserve_index_pack_stdout)
2239 ip.out = 0;
2240 else
2241 ip.no_stdout = 1;
2242
2243 if (run_command(&ip)) {
2244 ret = -1;
2245 goto cleanup;
2246 }
2247
2248 cleanup:
2249 close(tmpfile_fd);
2250 unlink(preq->tmpfile.buf);
2251 return ret;
2252 }
2253
2254 void http_install_packfile(struct packed_git *p,
2255 struct packed_git **list_to_remove_from)
2256 {
2257 struct packed_git **lst = list_to_remove_from;
2258
2259 while (*lst != p)
2260 lst = &((*lst)->next);
2261 *lst = (*lst)->next;
2262
2263 install_packed_git(the_repository, p);
2264 }
2265
2266 struct http_pack_request *new_http_pack_request(
2267 const unsigned char *packed_git_hash, const char *base_url) {
2268
2269 struct strbuf buf = STRBUF_INIT;
2270
2271 end_url_with_slash(&buf, base_url);
2272 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2273 hash_to_hex(packed_git_hash));
2274 return new_direct_http_pack_request(packed_git_hash,
2275 strbuf_detach(&buf, NULL));
2276 }
2277
2278 struct http_pack_request *new_direct_http_pack_request(
2279 const unsigned char *packed_git_hash, char *url)
2280 {
2281 off_t prev_posn = 0;
2282 struct http_pack_request *preq;
2283
2284 CALLOC_ARRAY(preq, 1);
2285 strbuf_init(&preq->tmpfile, 0);
2286
2287 preq->url = url;
2288
2289 strbuf_addf(&preq->tmpfile, "%s.temp", sha1_pack_name(packed_git_hash));
2290 preq->packfile = fopen(preq->tmpfile.buf, "a");
2291 if (!preq->packfile) {
2292 error("Unable to open local file %s for pack",
2293 preq->tmpfile.buf);
2294 goto abort;
2295 }
2296
2297 preq->slot = get_active_slot();
2298 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEDATA, preq->packfile);
2299 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2300 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2301 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2302 no_pragma_header);
2303
2304 /*
2305 * If there is data present from a previous transfer attempt,
2306 * resume where it left off
2307 */
2308 prev_posn = ftello(preq->packfile);
2309 if (prev_posn>0) {
2310 if (http_is_verbose)
2311 fprintf(stderr,
2312 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2313 hash_to_hex(packed_git_hash),
2314 (uintmax_t)prev_posn);
2315 http_opt_request_remainder(preq->slot->curl, prev_posn);
2316 }
2317
2318 return preq;
2319
2320 abort:
2321 strbuf_release(&preq->tmpfile);
2322 free(preq->url);
2323 free(preq);
2324 return NULL;
2325 }
2326
2327 /* Helpers for fetching objects (loose) */
2328 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2329 void *data)
2330 {
2331 unsigned char expn[4096];
2332 size_t size = eltsize * nmemb;
2333 int posn = 0;
2334 struct http_object_request *freq = data;
2335 struct active_request_slot *slot = freq->slot;
2336
2337 if (slot) {
2338 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2339 &slot->http_code);
2340 if (c != CURLE_OK)
2341 BUG("curl_easy_getinfo for HTTP code failed: %s",
2342 curl_easy_strerror(c));
2343 if (slot->http_code >= 300)
2344 return nmemb;
2345 }
2346
2347 do {
2348 ssize_t retval = xwrite(freq->localfile,
2349 (char *) ptr + posn, size - posn);
2350 if (retval < 0)
2351 return posn / eltsize;
2352 posn += retval;
2353 } while (posn < size);
2354
2355 freq->stream.avail_in = size;
2356 freq->stream.next_in = (void *)ptr;
2357 do {
2358 freq->stream.next_out = expn;
2359 freq->stream.avail_out = sizeof(expn);
2360 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2361 the_hash_algo->update_fn(&freq->c, expn,
2362 sizeof(expn) - freq->stream.avail_out);
2363 } while (freq->stream.avail_in && freq->zret == Z_OK);
2364 return nmemb;
2365 }
2366
2367 struct http_object_request *new_http_object_request(const char *base_url,
2368 const struct object_id *oid)
2369 {
2370 char *hex = oid_to_hex(oid);
2371 struct strbuf filename = STRBUF_INIT;
2372 struct strbuf prevfile = STRBUF_INIT;
2373 int prevlocal;
2374 char prev_buf[PREV_BUF_SIZE];
2375 ssize_t prev_read = 0;
2376 off_t prev_posn = 0;
2377 struct http_object_request *freq;
2378
2379 CALLOC_ARRAY(freq, 1);
2380 strbuf_init(&freq->tmpfile, 0);
2381 oidcpy(&freq->oid, oid);
2382 freq->localfile = -1;
2383
2384 loose_object_path(the_repository, &filename, oid);
2385 strbuf_addf(&freq->tmpfile, "%s.temp", filename.buf);
2386
2387 strbuf_addf(&prevfile, "%s.prev", filename.buf);
2388 unlink_or_warn(prevfile.buf);
2389 rename(freq->tmpfile.buf, prevfile.buf);
2390 unlink_or_warn(freq->tmpfile.buf);
2391 strbuf_release(&filename);
2392
2393 if (freq->localfile != -1)
2394 error("fd leakage in start: %d", freq->localfile);
2395 freq->localfile = open(freq->tmpfile.buf,
2396 O_WRONLY | O_CREAT | O_EXCL, 0666);
2397 /*
2398 * This could have failed due to the "lazy directory creation";
2399 * try to mkdir the last path component.
2400 */
2401 if (freq->localfile < 0 && errno == ENOENT) {
2402 char *dir = strrchr(freq->tmpfile.buf, '/');
2403 if (dir) {
2404 *dir = 0;
2405 mkdir(freq->tmpfile.buf, 0777);
2406 *dir = '/';
2407 }
2408 freq->localfile = open(freq->tmpfile.buf,
2409 O_WRONLY | O_CREAT | O_EXCL, 0666);
2410 }
2411
2412 if (freq->localfile < 0) {
2413 error_errno("Couldn't create temporary file %s",
2414 freq->tmpfile.buf);
2415 goto abort;
2416 }
2417
2418 git_inflate_init(&freq->stream);
2419
2420 the_hash_algo->init_fn(&freq->c);
2421
2422 freq->url = get_remote_object_url(base_url, hex, 0);
2423
2424 /*
2425 * If a previous temp file is present, process what was already
2426 * fetched.
2427 */
2428 prevlocal = open(prevfile.buf, O_RDONLY);
2429 if (prevlocal != -1) {
2430 do {
2431 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2432 if (prev_read>0) {
2433 if (fwrite_sha1_file(prev_buf,
2434 1,
2435 prev_read,
2436 freq) == prev_read) {
2437 prev_posn += prev_read;
2438 } else {
2439 prev_read = -1;
2440 }
2441 }
2442 } while (prev_read > 0);
2443 close(prevlocal);
2444 }
2445 unlink_or_warn(prevfile.buf);
2446 strbuf_release(&prevfile);
2447
2448 /*
2449 * Reset inflate/SHA1 if there was an error reading the previous temp
2450 * file; also rewind to the beginning of the local file.
2451 */
2452 if (prev_read == -1) {
2453 memset(&freq->stream, 0, sizeof(freq->stream));
2454 git_inflate_init(&freq->stream);
2455 the_hash_algo->init_fn(&freq->c);
2456 if (prev_posn>0) {
2457 prev_posn = 0;
2458 lseek(freq->localfile, 0, SEEK_SET);
2459 if (ftruncate(freq->localfile, 0) < 0) {
2460 error_errno("Couldn't truncate temporary file %s",
2461 freq->tmpfile.buf);
2462 goto abort;
2463 }
2464 }
2465 }
2466
2467 freq->slot = get_active_slot();
2468
2469 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEDATA, freq);
2470 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2471 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2472 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2473 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2474 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2475
2476 /*
2477 * If we have successfully processed data from a previous fetch
2478 * attempt, only fetch the data we don't already have.
2479 */
2480 if (prev_posn>0) {
2481 if (http_is_verbose)
2482 fprintf(stderr,
2483 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2484 hex, (uintmax_t)prev_posn);
2485 http_opt_request_remainder(freq->slot->curl, prev_posn);
2486 }
2487
2488 return freq;
2489
2490 abort:
2491 strbuf_release(&prevfile);
2492 free(freq->url);
2493 free(freq);
2494 return NULL;
2495 }
2496
2497 void process_http_object_request(struct http_object_request *freq)
2498 {
2499 if (!freq->slot)
2500 return;
2501 freq->curl_result = freq->slot->curl_result;
2502 freq->http_code = freq->slot->http_code;
2503 freq->slot = NULL;
2504 }
2505
2506 int finish_http_object_request(struct http_object_request *freq)
2507 {
2508 struct stat st;
2509 struct strbuf filename = STRBUF_INIT;
2510
2511 close(freq->localfile);
2512 freq->localfile = -1;
2513
2514 process_http_object_request(freq);
2515
2516 if (freq->http_code == 416) {
2517 warning("requested range invalid; we may already have all the data.");
2518 } else if (freq->curl_result != CURLE_OK) {
2519 if (stat(freq->tmpfile.buf, &st) == 0)
2520 if (st.st_size == 0)
2521 unlink_or_warn(freq->tmpfile.buf);
2522 return -1;
2523 }
2524
2525 git_inflate_end(&freq->stream);
2526 the_hash_algo->final_oid_fn(&freq->real_oid, &freq->c);
2527 if (freq->zret != Z_STREAM_END) {
2528 unlink_or_warn(freq->tmpfile.buf);
2529 return -1;
2530 }
2531 if (!oideq(&freq->oid, &freq->real_oid)) {
2532 unlink_or_warn(freq->tmpfile.buf);
2533 return -1;
2534 }
2535 loose_object_path(the_repository, &filename, &freq->oid);
2536 freq->rename = finalize_object_file(freq->tmpfile.buf, filename.buf);
2537 strbuf_release(&filename);
2538
2539 return freq->rename;
2540 }
2541
2542 void abort_http_object_request(struct http_object_request *freq)
2543 {
2544 unlink_or_warn(freq->tmpfile.buf);
2545
2546 release_http_object_request(freq);
2547 }
2548
2549 void release_http_object_request(struct http_object_request *freq)
2550 {
2551 if (freq->localfile != -1) {
2552 close(freq->localfile);
2553 freq->localfile = -1;
2554 }
2555 FREE_AND_NULL(freq->url);
2556 if (freq->slot) {
2557 freq->slot->callback_func = NULL;
2558 freq->slot->callback_data = NULL;
2559 release_active_slot(freq->slot);
2560 freq->slot = NULL;
2561 }
2562 strbuf_release(&freq->tmpfile);
2563 }
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