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Merge branch 'icasefs-symlink-confusion'
[git/gitster.git] / http.c
blob92c5a22f262836ff5953540c44bb4864e921182f
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 int seek_buffer(void *clientp, curl_off_t offset, int origin)
161 {
162 struct buffer *buffer = clientp;
163
164 if (origin != SEEK_SET)
165 BUG("seek_buffer only handles SEEK_SET");
166 if (offset < 0 || offset >= buffer->buf.len) {
167 error("curl seek would be outside of buffer");
168 return CURL_SEEKFUNC_FAIL;
169 }
170
171 buffer->posn = offset;
172 return CURL_SEEKFUNC_OK;
173 }
174
175 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
176 {
177 size_t size = eltsize * nmemb;
178 struct strbuf *buffer = buffer_;
179
180 strbuf_add(buffer, ptr, size);
181 return nmemb;
182 }
183
184 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
185 {
186 return nmemb;
187 }
188
189 static void closedown_active_slot(struct active_request_slot *slot)
190 {
191 active_requests--;
192 slot->in_use = 0;
193 }
194
195 static void finish_active_slot(struct active_request_slot *slot)
196 {
197 closedown_active_slot(slot);
198 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
199
200 if (slot->finished)
201 (*slot->finished) = 1;
202
203 /* Store slot results so they can be read after the slot is reused */
204 if (slot->results) {
205 slot->results->curl_result = slot->curl_result;
206 slot->results->http_code = slot->http_code;
207 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
208 &slot->results->auth_avail);
209
210 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
211 &slot->results->http_connectcode);
212 }
213
214 /* Run callback if appropriate */
215 if (slot->callback_func)
216 slot->callback_func(slot->callback_data);
217 }
218
219 static void xmulti_remove_handle(struct active_request_slot *slot)
220 {
221 curl_multi_remove_handle(curlm, slot->curl);
222 }
223
224 static void process_curl_messages(void)
225 {
226 int num_messages;
227 struct active_request_slot *slot;
228 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
229
230 while (curl_message != NULL) {
231 if (curl_message->msg == CURLMSG_DONE) {
232 int curl_result = curl_message->data.result;
233 slot = active_queue_head;
234 while (slot != NULL &&
235 slot->curl != curl_message->easy_handle)
236 slot = slot->next;
237 if (slot) {
238 xmulti_remove_handle(slot);
239 slot->curl_result = curl_result;
240 finish_active_slot(slot);
241 } else {
242 fprintf(stderr, "Received DONE message for unknown request!\n");
243 }
244 } else {
245 fprintf(stderr, "Unknown CURL message received: %d\n",
246 (int)curl_message->msg);
247 }
248 curl_message = curl_multi_info_read(curlm, &num_messages);
249 }
250 }
251
252 static int http_options(const char *var, const char *value, void *cb)
253 {
254 if (!strcmp("http.version", var)) {
255 return git_config_string(&curl_http_version, var, value);
256 }
257 if (!strcmp("http.sslverify", var)) {
258 curl_ssl_verify = git_config_bool(var, value);
259 return 0;
260 }
261 if (!strcmp("http.sslcipherlist", var))
262 return git_config_string(&ssl_cipherlist, var, value);
263 if (!strcmp("http.sslversion", var))
264 return git_config_string(&ssl_version, var, value);
265 if (!strcmp("http.sslcert", var))
266 return git_config_pathname(&ssl_cert, var, value);
267 if (!strcmp("http.sslkey", var))
268 return git_config_pathname(&ssl_key, var, value);
269 if (!strcmp("http.sslcapath", var))
270 return git_config_pathname(&ssl_capath, var, value);
271 if (!strcmp("http.sslcainfo", var))
272 return git_config_pathname(&ssl_cainfo, var, value);
273 if (!strcmp("http.sslcertpasswordprotected", var)) {
274 ssl_cert_password_required = git_config_bool(var, value);
275 return 0;
276 }
277 if (!strcmp("http.ssltry", var)) {
278 curl_ssl_try = git_config_bool(var, value);
279 return 0;
280 }
281 if (!strcmp("http.sslbackend", var)) {
282 free(http_ssl_backend);
283 http_ssl_backend = xstrdup_or_null(value);
284 return 0;
285 }
286
287 if (!strcmp("http.schannelcheckrevoke", var)) {
288 http_schannel_check_revoke = git_config_bool(var, value);
289 return 0;
290 }
291
292 if (!strcmp("http.schannelusesslcainfo", var)) {
293 http_schannel_use_ssl_cainfo = git_config_bool(var, value);
294 return 0;
295 }
296
297 if (!strcmp("http.minsessions", var)) {
298 min_curl_sessions = git_config_int(var, value);
299 if (min_curl_sessions > 1)
300 min_curl_sessions = 1;
301 return 0;
302 }
303 if (!strcmp("http.maxrequests", var)) {
304 max_requests = git_config_int(var, value);
305 return 0;
306 }
307 if (!strcmp("http.lowspeedlimit", var)) {
308 curl_low_speed_limit = (long)git_config_int(var, value);
309 return 0;
310 }
311 if (!strcmp("http.lowspeedtime", var)) {
312 curl_low_speed_time = (long)git_config_int(var, value);
313 return 0;
314 }
315
316 if (!strcmp("http.noepsv", var)) {
317 curl_ftp_no_epsv = git_config_bool(var, value);
318 return 0;
319 }
320 if (!strcmp("http.proxy", var))
321 return git_config_string(&curl_http_proxy, var, value);
322
323 if (!strcmp("http.proxyauthmethod", var))
324 return git_config_string(&http_proxy_authmethod, var, value);
325
326 if (!strcmp("http.proxysslcert", var))
327 return git_config_string(&http_proxy_ssl_cert, var, value);
328
329 if (!strcmp("http.proxysslkey", var))
330 return git_config_string(&http_proxy_ssl_key, var, value);
331
332 if (!strcmp("http.proxysslcainfo", var))
333 return git_config_string(&http_proxy_ssl_ca_info, var, value);
334
335 if (!strcmp("http.proxysslcertpasswordprotected", var)) {
336 proxy_ssl_cert_password_required = git_config_bool(var, value);
337 return 0;
338 }
339
340 if (!strcmp("http.cookiefile", var))
341 return git_config_pathname(&curl_cookie_file, var, value);
342 if (!strcmp("http.savecookies", var)) {
343 curl_save_cookies = git_config_bool(var, value);
344 return 0;
345 }
346
347 if (!strcmp("http.postbuffer", var)) {
348 http_post_buffer = git_config_ssize_t(var, value);
349 if (http_post_buffer < 0)
350 warning(_("negative value for http.postBuffer; defaulting to %d"), LARGE_PACKET_MAX);
351 if (http_post_buffer < LARGE_PACKET_MAX)
352 http_post_buffer = LARGE_PACKET_MAX;
353 return 0;
354 }
355
356 if (!strcmp("http.useragent", var))
357 return git_config_string(&user_agent, var, value);
358
359 if (!strcmp("http.emptyauth", var)) {
360 if (value && !strcmp("auto", value))
361 curl_empty_auth = -1;
362 else
363 curl_empty_auth = git_config_bool(var, value);
364 return 0;
365 }
366
367 if (!strcmp("http.delegation", var)) {
368 #ifdef CURLGSSAPI_DELEGATION_FLAG
369 return git_config_string(&curl_deleg, var, value);
370 #else
371 warning(_("Delegation control is not supported with cURL < 7.22.0"));
372 return 0;
373 #endif
374 }
375
376 if (!strcmp("http.pinnedpubkey", var)) {
377 #ifdef GIT_CURL_HAVE_CURLOPT_PINNEDPUBLICKEY
378 return git_config_pathname(&ssl_pinnedkey, var, value);
379 #else
380 warning(_("Public key pinning not supported with cURL < 7.39.0"));
381 return 0;
382 #endif
383 }
384
385 if (!strcmp("http.extraheader", var)) {
386 if (!value) {
387 return config_error_nonbool(var);
388 } else if (!*value) {
389 string_list_clear(&extra_http_headers, 0);
390 } else {
391 string_list_append(&extra_http_headers, value);
392 }
393 return 0;
394 }
395
396 if (!strcmp("http.curloptresolve", var)) {
397 if (!value) {
398 return config_error_nonbool(var);
399 } else if (!*value) {
400 curl_slist_free_all(host_resolutions);
401 host_resolutions = NULL;
402 } else {
403 host_resolutions = curl_slist_append(host_resolutions, value);
404 }
405 return 0;
406 }
407
408 if (!strcmp("http.followredirects", var)) {
409 if (value && !strcmp(value, "initial"))
410 http_follow_config = HTTP_FOLLOW_INITIAL;
411 else if (git_config_bool(var, value))
412 http_follow_config = HTTP_FOLLOW_ALWAYS;
413 else
414 http_follow_config = HTTP_FOLLOW_NONE;
415 return 0;
416 }
417
418 /* Fall back on the default ones */
419 return git_default_config(var, value, cb);
420 }
421
422 static int curl_empty_auth_enabled(void)
423 {
424 if (curl_empty_auth >= 0)
425 return curl_empty_auth;
426
427 /*
428 * In the automatic case, kick in the empty-auth
429 * hack as long as we would potentially try some
430 * method more exotic than "Basic" or "Digest".
431 *
432 * But only do this when this is our second or
433 * subsequent request, as by then we know what
434 * methods are available.
435 */
436 if (http_auth_methods_restricted &&
437 (http_auth_methods & ~empty_auth_useless))
438 return 1;
439 return 0;
440 }
441
442 static void init_curl_http_auth(CURL *result)
443 {
444 if (!http_auth.username || !*http_auth.username) {
445 if (curl_empty_auth_enabled())
446 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
447 return;
448 }
449
450 credential_fill(&http_auth);
451
452 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
453 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
454 }
455
456 /* *var must be free-able */
457 static void var_override(const char **var, char *value)
458 {
459 if (value) {
460 free((void *)*var);
461 *var = xstrdup(value);
462 }
463 }
464
465 static void set_proxyauth_name_password(CURL *result)
466 {
467 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
468 proxy_auth.username);
469 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
470 proxy_auth.password);
471 }
472
473 static void init_curl_proxy_auth(CURL *result)
474 {
475 if (proxy_auth.username) {
476 if (!proxy_auth.password)
477 credential_fill(&proxy_auth);
478 set_proxyauth_name_password(result);
479 }
480
481 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
482
483 if (http_proxy_authmethod) {
484 int i;
485 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
486 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
487 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
488 proxy_authmethods[i].curlauth_param);
489 break;
490 }
491 }
492 if (i == ARRAY_SIZE(proxy_authmethods)) {
493 warning("unsupported proxy authentication method %s: using anyauth",
494 http_proxy_authmethod);
495 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
496 }
497 }
498 else
499 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
500 }
501
502 static int has_cert_password(void)
503 {
504 if (ssl_cert == NULL || ssl_cert_password_required != 1)
505 return 0;
506 if (!cert_auth.password) {
507 cert_auth.protocol = xstrdup("cert");
508 cert_auth.host = xstrdup("");
509 cert_auth.username = xstrdup("");
510 cert_auth.path = xstrdup(ssl_cert);
511 credential_fill(&cert_auth);
512 }
513 return 1;
514 }
515
516 #ifdef GIT_CURL_HAVE_CURLOPT_PROXY_KEYPASSWD
517 static int has_proxy_cert_password(void)
518 {
519 if (http_proxy_ssl_cert == NULL || proxy_ssl_cert_password_required != 1)
520 return 0;
521 if (!proxy_cert_auth.password) {
522 proxy_cert_auth.protocol = xstrdup("cert");
523 proxy_cert_auth.host = xstrdup("");
524 proxy_cert_auth.username = xstrdup("");
525 proxy_cert_auth.path = xstrdup(http_proxy_ssl_cert);
526 credential_fill(&proxy_cert_auth);
527 }
528 return 1;
529 }
530 #endif
531
532 #ifdef GITCURL_HAVE_CURLOPT_TCP_KEEPALIVE
533 static void set_curl_keepalive(CURL *c)
534 {
535 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
536 }
537
538 #else
539 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
540 {
541 int ka = 1;
542 int rc;
543 socklen_t len = (socklen_t)sizeof(ka);
544
545 if (type != CURLSOCKTYPE_IPCXN)
546 return 0;
547
548 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
549 if (rc < 0)
550 warning_errno("unable to set SO_KEEPALIVE on socket");
551
552 return CURL_SOCKOPT_OK;
553 }
554
555 static void set_curl_keepalive(CURL *c)
556 {
557 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
558 }
559 #endif
560
561 /* Return 1 if redactions have been made, 0 otherwise. */
562 static int redact_sensitive_header(struct strbuf *header, size_t offset)
563 {
564 int ret = 0;
565 const char *sensitive_header;
566
567 if (trace_curl_redact &&
568 (skip_iprefix(header->buf + offset, "Authorization:", &sensitive_header) ||
569 skip_iprefix(header->buf + offset, "Proxy-Authorization:", &sensitive_header))) {
570 /* The first token is the type, which is OK to log */
571 while (isspace(*sensitive_header))
572 sensitive_header++;
573 while (*sensitive_header && !isspace(*sensitive_header))
574 sensitive_header++;
575 /* Everything else is opaque and possibly sensitive */
576 strbuf_setlen(header, sensitive_header - header->buf);
577 strbuf_addstr(header, " <redacted>");
578 ret = 1;
579 } else if (trace_curl_redact &&
580 skip_iprefix(header->buf + offset, "Cookie:", &sensitive_header)) {
581 struct strbuf redacted_header = STRBUF_INIT;
582 const char *cookie;
583
584 while (isspace(*sensitive_header))
585 sensitive_header++;
586
587 cookie = sensitive_header;
588
589 while (cookie) {
590 char *equals;
591 char *semicolon = strstr(cookie, "; ");
592 if (semicolon)
593 *semicolon = 0;
594 equals = strchrnul(cookie, '=');
595 if (!equals) {
596 /* invalid cookie, just append and continue */
597 strbuf_addstr(&redacted_header, cookie);
598 continue;
599 }
600 strbuf_add(&redacted_header, cookie, equals - cookie);
601 strbuf_addstr(&redacted_header, "=<redacted>");
602 if (semicolon) {
603 /*
604 * There are more cookies. (Or, for some
605 * reason, the input string ends in "; ".)
606 */
607 strbuf_addstr(&redacted_header, "; ");
608 cookie = semicolon + strlen("; ");
609 } else {
610 cookie = NULL;
611 }
612 }
613
614 strbuf_setlen(header, sensitive_header - header->buf);
615 strbuf_addbuf(header, &redacted_header);
616 ret = 1;
617 }
618 return ret;
619 }
620
621 static int match_curl_h2_trace(const char *line, const char **out)
622 {
623 const char *p;
624
625 /*
626 * curl prior to 8.1.0 gives us:
627 *
628 * h2h3 [<header-name>: <header-val>]
629 *
630 * Starting in 8.1.0, the first token became just "h2".
631 */
632 if (skip_iprefix(line, "h2h3 [", out) ||
633 skip_iprefix(line, "h2 [", out))
634 return 1;
635
636 /*
637 * curl 8.3.0 uses:
638 * [HTTP/2] [<stream-id>] [<header-name>: <header-val>]
639 * where <stream-id> is numeric.
640 */
641 if (skip_iprefix(line, "[HTTP/2] [", &p)) {
642 while (isdigit(*p))
643 p++;
644 if (skip_prefix(p, "] [", out))
645 return 1;
646 }
647
648 return 0;
649 }
650
651 /* Redact headers in info */
652 static void redact_sensitive_info_header(struct strbuf *header)
653 {
654 const char *sensitive_header;
655
656 if (trace_curl_redact &&
657 match_curl_h2_trace(header->buf, &sensitive_header)) {
658 if (redact_sensitive_header(header, sensitive_header - header->buf)) {
659 /* redaction ate our closing bracket */
660 strbuf_addch(header, ']');
661 }
662 }
663 }
664
665 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
666 {
667 struct strbuf out = STRBUF_INIT;
668 struct strbuf **headers, **header;
669
670 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
671 text, (long)size, (long)size);
672 trace_strbuf(&trace_curl, &out);
673 strbuf_reset(&out);
674 strbuf_add(&out, ptr, size);
675 headers = strbuf_split_max(&out, '\n', 0);
676
677 for (header = headers; *header; header++) {
678 if (hide_sensitive_header)
679 redact_sensitive_header(*header, 0);
680 strbuf_insertstr((*header), 0, text);
681 strbuf_insertstr((*header), strlen(text), ": ");
682 strbuf_rtrim((*header));
683 strbuf_addch((*header), '\n');
684 trace_strbuf(&trace_curl, (*header));
685 }
686 strbuf_list_free(headers);
687 strbuf_release(&out);
688 }
689
690 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
691 {
692 size_t i;
693 struct strbuf out = STRBUF_INIT;
694 unsigned int width = 60;
695
696 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
697 text, (long)size, (long)size);
698 trace_strbuf(&trace_curl, &out);
699
700 for (i = 0; i < size; i += width) {
701 size_t w;
702
703 strbuf_reset(&out);
704 strbuf_addf(&out, "%s: ", text);
705 for (w = 0; (w < width) && (i + w < size); w++) {
706 unsigned char ch = ptr[i + w];
707
708 strbuf_addch(&out,
709 (ch >= 0x20) && (ch < 0x80)
710 ? ch : '.');
711 }
712 strbuf_addch(&out, '\n');
713 trace_strbuf(&trace_curl, &out);
714 }
715 strbuf_release(&out);
716 }
717
718 static void curl_dump_info(char *data, size_t size)
719 {
720 struct strbuf buf = STRBUF_INIT;
721
722 strbuf_add(&buf, data, size);
723
724 redact_sensitive_info_header(&buf);
725 trace_printf_key(&trace_curl, "== Info: %s", buf.buf);
726
727 strbuf_release(&buf);
728 }
729
730 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
731 {
732 const char *text;
733 enum { NO_FILTER = 0, DO_FILTER = 1 };
734
735 switch (type) {
736 case CURLINFO_TEXT:
737 curl_dump_info(data, size);
738 break;
739 case CURLINFO_HEADER_OUT:
740 text = "=> Send header";
741 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
742 break;
743 case CURLINFO_DATA_OUT:
744 if (trace_curl_data) {
745 text = "=> Send data";
746 curl_dump_data(text, (unsigned char *)data, size);
747 }
748 break;
749 case CURLINFO_SSL_DATA_OUT:
750 if (trace_curl_data) {
751 text = "=> Send SSL data";
752 curl_dump_data(text, (unsigned char *)data, size);
753 }
754 break;
755 case CURLINFO_HEADER_IN:
756 text = "<= Recv header";
757 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
758 break;
759 case CURLINFO_DATA_IN:
760 if (trace_curl_data) {
761 text = "<= Recv data";
762 curl_dump_data(text, (unsigned char *)data, size);
763 }
764 break;
765 case CURLINFO_SSL_DATA_IN:
766 if (trace_curl_data) {
767 text = "<= Recv SSL data";
768 curl_dump_data(text, (unsigned char *)data, size);
769 }
770 break;
771
772 default: /* we ignore unknown types by default */
773 return 0;
774 }
775 return 0;
776 }
777
778 void http_trace_curl_no_data(void)
779 {
780 trace_override_envvar(&trace_curl, "1");
781 trace_curl_data = 0;
782 }
783
784 void setup_curl_trace(CURL *handle)
785 {
786 if (!trace_want(&trace_curl))
787 return;
788 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
789 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
790 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
791 }
792
793 static void proto_list_append(struct strbuf *list, const char *proto)
794 {
795 if (!list)
796 return;
797 if (list->len)
798 strbuf_addch(list, ',');
799 strbuf_addstr(list, proto);
800 }
801
802 static long get_curl_allowed_protocols(int from_user, struct strbuf *list)
803 {
804 long bits = 0;
805
806 if (is_transport_allowed("http", from_user)) {
807 bits |= CURLPROTO_HTTP;
808 proto_list_append(list, "http");
809 }
810 if (is_transport_allowed("https", from_user)) {
811 bits |= CURLPROTO_HTTPS;
812 proto_list_append(list, "https");
813 }
814 if (is_transport_allowed("ftp", from_user)) {
815 bits |= CURLPROTO_FTP;
816 proto_list_append(list, "ftp");
817 }
818 if (is_transport_allowed("ftps", from_user)) {
819 bits |= CURLPROTO_FTPS;
820 proto_list_append(list, "ftps");
821 }
822
823 return bits;
824 }
825
826 #ifdef GIT_CURL_HAVE_CURL_HTTP_VERSION_2
827 static int get_curl_http_version_opt(const char *version_string, long *opt)
828 {
829 int i;
830 static struct {
831 const char *name;
832 long opt_token;
833 } choice[] = {
834 { "HTTP/1.1", CURL_HTTP_VERSION_1_1 },
835 { "HTTP/2", CURL_HTTP_VERSION_2 }
836 };
837
838 for (i = 0; i < ARRAY_SIZE(choice); i++) {
839 if (!strcmp(version_string, choice[i].name)) {
840 *opt = choice[i].opt_token;
841 return 0;
842 }
843 }
844
845 warning("unknown value given to http.version: '%s'", version_string);
846 return -1; /* not found */
847 }
848
849 #endif
850
851 static CURL *get_curl_handle(void)
852 {
853 CURL *result = curl_easy_init();
854
855 if (!result)
856 die("curl_easy_init failed");
857
858 if (!curl_ssl_verify) {
859 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
860 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
861 } else {
862 /* Verify authenticity of the peer's certificate */
863 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
864 /* The name in the cert must match whom we tried to connect */
865 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
866 }
867
868 #ifdef GIT_CURL_HAVE_CURL_HTTP_VERSION_2
869 if (curl_http_version) {
870 long opt;
871 if (!get_curl_http_version_opt(curl_http_version, &opt)) {
872 /* Set request use http version */
873 curl_easy_setopt(result, CURLOPT_HTTP_VERSION, opt);
874 }
875 }
876 #endif
877
878 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
879 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
880
881 #ifdef CURLGSSAPI_DELEGATION_FLAG
882 if (curl_deleg) {
883 int i;
884 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
885 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
886 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
887 curl_deleg_levels[i].curl_deleg_param);
888 break;
889 }
890 }
891 if (i == ARRAY_SIZE(curl_deleg_levels))
892 warning("Unknown delegation method '%s': using default",
893 curl_deleg);
894 }
895 #endif
896
897 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
898 !http_schannel_check_revoke) {
899 #ifdef GIT_CURL_HAVE_CURLSSLOPT_NO_REVOKE
900 curl_easy_setopt(result, CURLOPT_SSL_OPTIONS, CURLSSLOPT_NO_REVOKE);
901 #else
902 warning(_("CURLSSLOPT_NO_REVOKE not supported with cURL < 7.44.0"));
903 #endif
904 }
905
906 if (http_proactive_auth)
907 init_curl_http_auth(result);
908
909 if (getenv("GIT_SSL_VERSION"))
910 ssl_version = getenv("GIT_SSL_VERSION");
911 if (ssl_version && *ssl_version) {
912 int i;
913 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
914 if (!strcmp(ssl_version, sslversions[i].name)) {
915 curl_easy_setopt(result, CURLOPT_SSLVERSION,
916 sslversions[i].ssl_version);
917 break;
918 }
919 }
920 if (i == ARRAY_SIZE(sslversions))
921 warning("unsupported ssl version %s: using default",
922 ssl_version);
923 }
924
925 if (getenv("GIT_SSL_CIPHER_LIST"))
926 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
927 if (ssl_cipherlist != NULL && *ssl_cipherlist)
928 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
929 ssl_cipherlist);
930
931 if (ssl_cert)
932 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
933 if (has_cert_password())
934 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
935 if (ssl_key)
936 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
937 if (ssl_capath)
938 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
939 #ifdef GIT_CURL_HAVE_CURLOPT_PINNEDPUBLICKEY
940 if (ssl_pinnedkey)
941 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
942 #endif
943 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
944 !http_schannel_use_ssl_cainfo) {
945 curl_easy_setopt(result, CURLOPT_CAINFO, NULL);
946 #ifdef GIT_CURL_HAVE_CURLOPT_PROXY_CAINFO
947 curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, NULL);
948 #endif
949 } else if (ssl_cainfo != NULL || http_proxy_ssl_ca_info != NULL) {
950 if (ssl_cainfo)
951 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
952 #ifdef GIT_CURL_HAVE_CURLOPT_PROXY_CAINFO
953 if (http_proxy_ssl_ca_info)
954 curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, http_proxy_ssl_ca_info);
955 #endif
956 }
957
958 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
959 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
960 curl_low_speed_limit);
961 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
962 curl_low_speed_time);
963 }
964
965 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
966 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
967
968 #ifdef GIT_CURL_HAVE_CURLOPT_PROTOCOLS_STR
969 {
970 struct strbuf buf = STRBUF_INIT;
971
972 get_curl_allowed_protocols(0, &buf);
973 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS_STR, buf.buf);
974 strbuf_reset(&buf);
975
976 get_curl_allowed_protocols(-1, &buf);
977 curl_easy_setopt(result, CURLOPT_PROTOCOLS_STR, buf.buf);
978 strbuf_release(&buf);
979 }
980 #else
981 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
982 get_curl_allowed_protocols(0, NULL));
983 curl_easy_setopt(result, CURLOPT_PROTOCOLS,
984 get_curl_allowed_protocols(-1, NULL));
985 #endif
986
987 if (getenv("GIT_CURL_VERBOSE"))
988 http_trace_curl_no_data();
989 setup_curl_trace(result);
990 if (getenv("GIT_TRACE_CURL_NO_DATA"))
991 trace_curl_data = 0;
992 if (!git_env_bool("GIT_TRACE_REDACT", 1))
993 trace_curl_redact = 0;
994
995 curl_easy_setopt(result, CURLOPT_USERAGENT,
996 user_agent ? user_agent : git_user_agent());
997
998 if (curl_ftp_no_epsv)
999 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
1000
1001 if (curl_ssl_try)
1002 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
1003
1004 /*
1005 * CURL also examines these variables as a fallback; but we need to query
1006 * them here in order to decide whether to prompt for missing password (cf.
1007 * init_curl_proxy_auth()).
1008 *
1009 * Unlike many other common environment variables, these are historically
1010 * lowercase only. It appears that CURL did not know this and implemented
1011 * only uppercase variants, which was later corrected to take both - with
1012 * the exception of http_proxy, which is lowercase only also in CURL. As
1013 * the lowercase versions are the historical quasi-standard, they take
1014 * precedence here, as in CURL.
1015 */
1016 if (!curl_http_proxy) {
1017 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
1018 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
1019 var_override(&curl_http_proxy, getenv("https_proxy"));
1020 } else {
1021 var_override(&curl_http_proxy, getenv("http_proxy"));
1022 }
1023 if (!curl_http_proxy) {
1024 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
1025 var_override(&curl_http_proxy, getenv("all_proxy"));
1026 }
1027 }
1028
1029 if (curl_http_proxy && curl_http_proxy[0] == '\0') {
1030 /*
1031 * Handle case with the empty http.proxy value here to keep
1032 * common code clean.
1033 * NB: empty option disables proxying at all.
1034 */
1035 curl_easy_setopt(result, CURLOPT_PROXY, "");
1036 } else if (curl_http_proxy) {
1037 if (starts_with(curl_http_proxy, "socks5h"))
1038 curl_easy_setopt(result,
1039 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
1040 else if (starts_with(curl_http_proxy, "socks5"))
1041 curl_easy_setopt(result,
1042 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
1043 else if (starts_with(curl_http_proxy, "socks4a"))
1044 curl_easy_setopt(result,
1045 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
1046 else if (starts_with(curl_http_proxy, "socks"))
1047 curl_easy_setopt(result,
1048 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
1049 #ifdef GIT_CURL_HAVE_CURLOPT_PROXY_KEYPASSWD
1050 else if (starts_with(curl_http_proxy, "https")) {
1051 curl_easy_setopt(result, CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
1052
1053 if (http_proxy_ssl_cert)
1054 curl_easy_setopt(result, CURLOPT_PROXY_SSLCERT, http_proxy_ssl_cert);
1055
1056 if (http_proxy_ssl_key)
1057 curl_easy_setopt(result, CURLOPT_PROXY_SSLKEY, http_proxy_ssl_key);
1058
1059 if (has_proxy_cert_password())
1060 curl_easy_setopt(result, CURLOPT_PROXY_KEYPASSWD, proxy_cert_auth.password);
1061 }
1062 #endif
1063 if (strstr(curl_http_proxy, "://"))
1064 credential_from_url(&proxy_auth, curl_http_proxy);
1065 else {
1066 struct strbuf url = STRBUF_INIT;
1067 strbuf_addf(&url, "http://%s", curl_http_proxy);
1068 credential_from_url(&proxy_auth, url.buf);
1069 strbuf_release(&url);
1070 }
1071
1072 if (!proxy_auth.host)
1073 die("Invalid proxy URL '%s'", curl_http_proxy);
1074
1075 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
1076 var_override(&curl_no_proxy, getenv("NO_PROXY"));
1077 var_override(&curl_no_proxy, getenv("no_proxy"));
1078 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
1079 }
1080 init_curl_proxy_auth(result);
1081
1082 set_curl_keepalive(result);
1083
1084 return result;
1085 }
1086
1087 static void set_from_env(const char **var, const char *envname)
1088 {
1089 const char *val = getenv(envname);
1090 if (val)
1091 *var = val;
1092 }
1093
1094 void http_init(struct remote *remote, const char *url, int proactive_auth)
1095 {
1096 char *low_speed_limit;
1097 char *low_speed_time;
1098 char *normalized_url;
1099 struct urlmatch_config config = URLMATCH_CONFIG_INIT;
1100
1101 config.section = "http";
1102 config.key = NULL;
1103 config.collect_fn = http_options;
1104 config.cascade_fn = git_default_config;
1105 config.cb = NULL;
1106
1107 http_is_verbose = 0;
1108 normalized_url = url_normalize(url, &config.url);
1109
1110 git_config(urlmatch_config_entry, &config);
1111 free(normalized_url);
1112 string_list_clear(&config.vars, 1);
1113
1114 #ifdef GIT_CURL_HAVE_CURLSSLSET_NO_BACKENDS
1115 if (http_ssl_backend) {
1116 const curl_ssl_backend **backends;
1117 struct strbuf buf = STRBUF_INIT;
1118 int i;
1119
1120 switch (curl_global_sslset(-1, http_ssl_backend, &backends)) {
1121 case CURLSSLSET_UNKNOWN_BACKEND:
1122 strbuf_addf(&buf, _("Unsupported SSL backend '%s'. "
1123 "Supported SSL backends:"),
1124 http_ssl_backend);
1125 for (i = 0; backends[i]; i++)
1126 strbuf_addf(&buf, "\n\t%s", backends[i]->name);
1127 die("%s", buf.buf);
1128 case CURLSSLSET_NO_BACKENDS:
1129 die(_("Could not set SSL backend to '%s': "
1130 "cURL was built without SSL backends"),
1131 http_ssl_backend);
1132 case CURLSSLSET_TOO_LATE:
1133 die(_("Could not set SSL backend to '%s': already set"),
1134 http_ssl_backend);
1135 case CURLSSLSET_OK:
1136 break; /* Okay! */
1137 }
1138 }
1139 #endif
1140
1141 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1142 die("curl_global_init failed");
1143
1144 http_proactive_auth = proactive_auth;
1145
1146 if (remote && remote->http_proxy)
1147 curl_http_proxy = xstrdup(remote->http_proxy);
1148
1149 if (remote)
1150 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
1151
1152 pragma_header = curl_slist_append(http_copy_default_headers(),
1153 "Pragma: no-cache");
1154 no_pragma_header = curl_slist_append(http_copy_default_headers(),
1155 "Pragma:");
1156
1157 {
1158 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1159 if (http_max_requests)
1160 max_requests = atoi(http_max_requests);
1161 }
1162
1163 curlm = curl_multi_init();
1164 if (!curlm)
1165 die("curl_multi_init failed");
1166
1167 if (getenv("GIT_SSL_NO_VERIFY"))
1168 curl_ssl_verify = 0;
1169
1170 set_from_env(&ssl_cert, "GIT_SSL_CERT");
1171 set_from_env(&ssl_key, "GIT_SSL_KEY");
1172 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
1173 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
1174
1175 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
1176
1177 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1178 if (low_speed_limit)
1179 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1180 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1181 if (low_speed_time)
1182 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1183
1184 if (curl_ssl_verify == -1)
1185 curl_ssl_verify = 1;
1186
1187 curl_session_count = 0;
1188 if (max_requests < 1)
1189 max_requests = DEFAULT_MAX_REQUESTS;
1190
1191 set_from_env(&http_proxy_ssl_cert, "GIT_PROXY_SSL_CERT");
1192 set_from_env(&http_proxy_ssl_key, "GIT_PROXY_SSL_KEY");
1193 set_from_env(&http_proxy_ssl_ca_info, "GIT_PROXY_SSL_CAINFO");
1194
1195 if (getenv("GIT_PROXY_SSL_CERT_PASSWORD_PROTECTED"))
1196 proxy_ssl_cert_password_required = 1;
1197
1198 if (getenv("GIT_CURL_FTP_NO_EPSV"))
1199 curl_ftp_no_epsv = 1;
1200
1201 if (url) {
1202 credential_from_url(&http_auth, url);
1203 if (!ssl_cert_password_required &&
1204 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1205 starts_with(url, "https://"))
1206 ssl_cert_password_required = 1;
1207 }
1208
1209 curl_default = get_curl_handle();
1210 }
1211
1212 void http_cleanup(void)
1213 {
1214 struct active_request_slot *slot = active_queue_head;
1215
1216 while (slot != NULL) {
1217 struct active_request_slot *next = slot->next;
1218 if (slot->curl) {
1219 xmulti_remove_handle(slot);
1220 curl_easy_cleanup(slot->curl);
1221 }
1222 free(slot);
1223 slot = next;
1224 }
1225 active_queue_head = NULL;
1226
1227 curl_easy_cleanup(curl_default);
1228
1229 curl_multi_cleanup(curlm);
1230 curl_global_cleanup();
1231
1232 string_list_clear(&extra_http_headers, 0);
1233
1234 curl_slist_free_all(pragma_header);
1235 pragma_header = NULL;
1236
1237 curl_slist_free_all(no_pragma_header);
1238 no_pragma_header = NULL;
1239
1240 curl_slist_free_all(host_resolutions);
1241 host_resolutions = NULL;
1242
1243 if (curl_http_proxy) {
1244 free((void *)curl_http_proxy);
1245 curl_http_proxy = NULL;
1246 }
1247
1248 if (proxy_auth.password) {
1249 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1250 FREE_AND_NULL(proxy_auth.password);
1251 }
1252
1253 free((void *)curl_proxyuserpwd);
1254 curl_proxyuserpwd = NULL;
1255
1256 free((void *)http_proxy_authmethod);
1257 http_proxy_authmethod = NULL;
1258
1259 if (cert_auth.password) {
1260 memset(cert_auth.password, 0, strlen(cert_auth.password));
1261 FREE_AND_NULL(cert_auth.password);
1262 }
1263 ssl_cert_password_required = 0;
1264
1265 if (proxy_cert_auth.password) {
1266 memset(proxy_cert_auth.password, 0, strlen(proxy_cert_auth.password));
1267 FREE_AND_NULL(proxy_cert_auth.password);
1268 }
1269 proxy_ssl_cert_password_required = 0;
1270
1271 FREE_AND_NULL(cached_accept_language);
1272 }
1273
1274 struct active_request_slot *get_active_slot(void)
1275 {
1276 struct active_request_slot *slot = active_queue_head;
1277 struct active_request_slot *newslot;
1278
1279 int num_transfers;
1280
1281 /* Wait for a slot to open up if the queue is full */
1282 while (active_requests >= max_requests) {
1283 curl_multi_perform(curlm, &num_transfers);
1284 if (num_transfers < active_requests)
1285 process_curl_messages();
1286 }
1287
1288 while (slot != NULL && slot->in_use)
1289 slot = slot->next;
1290
1291 if (!slot) {
1292 newslot = xmalloc(sizeof(*newslot));
1293 newslot->curl = NULL;
1294 newslot->in_use = 0;
1295 newslot->next = NULL;
1296
1297 slot = active_queue_head;
1298 if (!slot) {
1299 active_queue_head = newslot;
1300 } else {
1301 while (slot->next != NULL)
1302 slot = slot->next;
1303 slot->next = newslot;
1304 }
1305 slot = newslot;
1306 }
1307
1308 if (!slot->curl) {
1309 slot->curl = curl_easy_duphandle(curl_default);
1310 curl_session_count++;
1311 }
1312
1313 active_requests++;
1314 slot->in_use = 1;
1315 slot->results = NULL;
1316 slot->finished = NULL;
1317 slot->callback_data = NULL;
1318 slot->callback_func = NULL;
1319 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1320 if (curl_save_cookies)
1321 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1322 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1323 curl_easy_setopt(slot->curl, CURLOPT_RESOLVE, host_resolutions);
1324 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1325 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1326 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1327 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1328 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1329 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, -1L);
1330 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1331 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1332 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1333 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1334
1335 /*
1336 * Default following to off unless "ALWAYS" is configured; this gives
1337 * callers a sane starting point, and they can tweak for individual
1338 * HTTP_FOLLOW_* cases themselves.
1339 */
1340 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1341 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1342 else
1343 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1344
1345 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1346 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1347 if (http_auth.password || curl_empty_auth_enabled())
1348 init_curl_http_auth(slot->curl);
1349
1350 return slot;
1351 }
1352
1353 int start_active_slot(struct active_request_slot *slot)
1354 {
1355 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1356 int num_transfers;
1357
1358 if (curlm_result != CURLM_OK &&
1359 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1360 warning("curl_multi_add_handle failed: %s",
1361 curl_multi_strerror(curlm_result));
1362 active_requests--;
1363 slot->in_use = 0;
1364 return 0;
1365 }
1366
1367 /*
1368 * We know there must be something to do, since we just added
1369 * something.
1370 */
1371 curl_multi_perform(curlm, &num_transfers);
1372 return 1;
1373 }
1374
1375 struct fill_chain {
1376 void *data;
1377 int (*fill)(void *);
1378 struct fill_chain *next;
1379 };
1380
1381 static struct fill_chain *fill_cfg;
1382
1383 void add_fill_function(void *data, int (*fill)(void *))
1384 {
1385 struct fill_chain *new_fill = xmalloc(sizeof(*new_fill));
1386 struct fill_chain **linkp = &fill_cfg;
1387 new_fill->data = data;
1388 new_fill->fill = fill;
1389 new_fill->next = NULL;
1390 while (*linkp)
1391 linkp = &(*linkp)->next;
1392 *linkp = new_fill;
1393 }
1394
1395 void fill_active_slots(void)
1396 {
1397 struct active_request_slot *slot = active_queue_head;
1398
1399 while (active_requests < max_requests) {
1400 struct fill_chain *fill;
1401 for (fill = fill_cfg; fill; fill = fill->next)
1402 if (fill->fill(fill->data))
1403 break;
1404
1405 if (!fill)
1406 break;
1407 }
1408
1409 while (slot != NULL) {
1410 if (!slot->in_use && slot->curl != NULL
1411 && curl_session_count > min_curl_sessions) {
1412 curl_easy_cleanup(slot->curl);
1413 slot->curl = NULL;
1414 curl_session_count--;
1415 }
1416 slot = slot->next;
1417 }
1418 }
1419
1420 void step_active_slots(void)
1421 {
1422 int num_transfers;
1423 CURLMcode curlm_result;
1424
1425 do {
1426 curlm_result = curl_multi_perform(curlm, &num_transfers);
1427 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1428 if (num_transfers < active_requests) {
1429 process_curl_messages();
1430 fill_active_slots();
1431 }
1432 }
1433
1434 void run_active_slot(struct active_request_slot *slot)
1435 {
1436 fd_set readfds;
1437 fd_set writefds;
1438 fd_set excfds;
1439 int max_fd;
1440 struct timeval select_timeout;
1441 int finished = 0;
1442
1443 slot->finished = &finished;
1444 while (!finished) {
1445 step_active_slots();
1446
1447 if (slot->in_use) {
1448 long curl_timeout;
1449 curl_multi_timeout(curlm, &curl_timeout);
1450 if (curl_timeout == 0) {
1451 continue;
1452 } else if (curl_timeout == -1) {
1453 select_timeout.tv_sec = 0;
1454 select_timeout.tv_usec = 50000;
1455 } else {
1456 select_timeout.tv_sec = curl_timeout / 1000;
1457 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1458 }
1459
1460 max_fd = -1;
1461 FD_ZERO(&readfds);
1462 FD_ZERO(&writefds);
1463 FD_ZERO(&excfds);
1464 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1465
1466 /*
1467 * It can happen that curl_multi_timeout returns a pathologically
1468 * long timeout when curl_multi_fdset returns no file descriptors
1469 * to read. See commit message for more details.
1470 */
1471 if (max_fd < 0 &&
1472 (select_timeout.tv_sec > 0 ||
1473 select_timeout.tv_usec > 50000)) {
1474 select_timeout.tv_sec = 0;
1475 select_timeout.tv_usec = 50000;
1476 }
1477
1478 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1479 }
1480 }
1481
1482 /*
1483 * The value of slot->finished we set before the loop was used
1484 * to set our "finished" variable when our request completed.
1485 *
1486 * 1. The slot may not have been reused for another requst
1487 * yet, in which case it still has &finished.
1488 *
1489 * 2. The slot may already be in-use to serve another request,
1490 * which can further be divided into two cases:
1491 *
1492 * (a) If call run_active_slot() hasn't been called for that
1493 * other request, slot->finished would have been cleared
1494 * by get_active_slot() and has NULL.
1495 *
1496 * (b) If the request did call run_active_slot(), then the
1497 * call would have updated slot->finished at the beginning
1498 * of this function, and with the clearing of the member
1499 * below, we would find that slot->finished is now NULL.
1500 *
1501 * In all cases, slot->finished has no useful information to
1502 * anybody at this point. Some compilers warn us for
1503 * attempting to smuggle a pointer that is about to become
1504 * invalid, i.e. &finished. We clear it here to assure them.
1505 */
1506 slot->finished = NULL;
1507 }
1508
1509 static void release_active_slot(struct active_request_slot *slot)
1510 {
1511 closedown_active_slot(slot);
1512 if (slot->curl) {
1513 xmulti_remove_handle(slot);
1514 if (curl_session_count > min_curl_sessions) {
1515 curl_easy_cleanup(slot->curl);
1516 slot->curl = NULL;
1517 curl_session_count--;
1518 }
1519 }
1520 fill_active_slots();
1521 }
1522
1523 void finish_all_active_slots(void)
1524 {
1525 struct active_request_slot *slot = active_queue_head;
1526
1527 while (slot != NULL)
1528 if (slot->in_use) {
1529 run_active_slot(slot);
1530 slot = active_queue_head;
1531 } else {
1532 slot = slot->next;
1533 }
1534 }
1535
1536 /* Helpers for modifying and creating URLs */
1537 static inline int needs_quote(int ch)
1538 {
1539 if (((ch >= 'A') && (ch <= 'Z'))
1540 || ((ch >= 'a') && (ch <= 'z'))
1541 || ((ch >= '0') && (ch <= '9'))
1542 || (ch == '/')
1543 || (ch == '-')
1544 || (ch == '.'))
1545 return 0;
1546 return 1;
1547 }
1548
1549 static char *quote_ref_url(const char *base, const char *ref)
1550 {
1551 struct strbuf buf = STRBUF_INIT;
1552 const char *cp;
1553 int ch;
1554
1555 end_url_with_slash(&buf, base);
1556
1557 for (cp = ref; (ch = *cp) != 0; cp++)
1558 if (needs_quote(ch))
1559 strbuf_addf(&buf, "%%%02x", ch);
1560 else
1561 strbuf_addch(&buf, *cp);
1562
1563 return strbuf_detach(&buf, NULL);
1564 }
1565
1566 void append_remote_object_url(struct strbuf *buf, const char *url,
1567 const char *hex,
1568 int only_two_digit_prefix)
1569 {
1570 end_url_with_slash(buf, url);
1571
1572 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1573 if (!only_two_digit_prefix)
1574 strbuf_addstr(buf, hex + 2);
1575 }
1576
1577 char *get_remote_object_url(const char *url, const char *hex,
1578 int only_two_digit_prefix)
1579 {
1580 struct strbuf buf = STRBUF_INIT;
1581 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1582 return strbuf_detach(&buf, NULL);
1583 }
1584
1585 void normalize_curl_result(CURLcode *result, long http_code,
1586 char *errorstr, size_t errorlen)
1587 {
1588 /*
1589 * If we see a failing http code with CURLE_OK, we have turned off
1590 * FAILONERROR (to keep the server's custom error response), and should
1591 * translate the code into failure here.
1592 *
1593 * Likewise, if we see a redirect (30x code), that means we turned off
1594 * redirect-following, and we should treat the result as an error.
1595 */
1596 if (*result == CURLE_OK && http_code >= 300) {
1597 *result = CURLE_HTTP_RETURNED_ERROR;
1598 /*
1599 * Normally curl will already have put the "reason phrase"
1600 * from the server into curl_errorstr; unfortunately without
1601 * FAILONERROR it is lost, so we can give only the numeric
1602 * status code.
1603 */
1604 xsnprintf(errorstr, errorlen,
1605 "The requested URL returned error: %ld",
1606 http_code);
1607 }
1608 }
1609
1610 static int handle_curl_result(struct slot_results *results)
1611 {
1612 normalize_curl_result(&results->curl_result, results->http_code,
1613 curl_errorstr, sizeof(curl_errorstr));
1614
1615 if (results->curl_result == CURLE_OK) {
1616 credential_approve(&http_auth);
1617 credential_approve(&proxy_auth);
1618 credential_approve(&cert_auth);
1619 return HTTP_OK;
1620 } else if (results->curl_result == CURLE_SSL_CERTPROBLEM) {
1621 /*
1622 * We can't tell from here whether it's a bad path, bad
1623 * certificate, bad password, or something else wrong
1624 * with the certificate. So we reject the credential to
1625 * avoid caching or saving a bad password.
1626 */
1627 credential_reject(&cert_auth);
1628 return HTTP_NOAUTH;
1629 #ifdef GIT_CURL_HAVE_CURLE_SSL_PINNEDPUBKEYNOTMATCH
1630 } else if (results->curl_result == CURLE_SSL_PINNEDPUBKEYNOTMATCH) {
1631 return HTTP_NOMATCHPUBLICKEY;
1632 #endif
1633 } else if (missing_target(results))
1634 return HTTP_MISSING_TARGET;
1635 else if (results->http_code == 401) {
1636 if (http_auth.username && http_auth.password) {
1637 credential_reject(&http_auth);
1638 return HTTP_NOAUTH;
1639 } else {
1640 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1641 if (results->auth_avail) {
1642 http_auth_methods &= results->auth_avail;
1643 http_auth_methods_restricted = 1;
1644 }
1645 return HTTP_REAUTH;
1646 }
1647 } else {
1648 if (results->http_connectcode == 407)
1649 credential_reject(&proxy_auth);
1650 if (!curl_errorstr[0])
1651 strlcpy(curl_errorstr,
1652 curl_easy_strerror(results->curl_result),
1653 sizeof(curl_errorstr));
1654 return HTTP_ERROR;
1655 }
1656 }
1657
1658 int run_one_slot(struct active_request_slot *slot,
1659 struct slot_results *results)
1660 {
1661 slot->results = results;
1662 if (!start_active_slot(slot)) {
1663 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1664 "failed to start HTTP request");
1665 return HTTP_START_FAILED;
1666 }
1667
1668 run_active_slot(slot);
1669 return handle_curl_result(results);
1670 }
1671
1672 struct curl_slist *http_copy_default_headers(void)
1673 {
1674 struct curl_slist *headers = NULL;
1675 const struct string_list_item *item;
1676
1677 for_each_string_list_item(item, &extra_http_headers)
1678 headers = curl_slist_append(headers, item->string);
1679
1680 return headers;
1681 }
1682
1683 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1684 {
1685 char *ptr;
1686 CURLcode ret;
1687
1688 strbuf_reset(buf);
1689 ret = curl_easy_getinfo(curl, info, &ptr);
1690 if (!ret && ptr)
1691 strbuf_addstr(buf, ptr);
1692 return ret;
1693 }
1694
1695 /*
1696 * Check for and extract a content-type parameter. "raw"
1697 * should be positioned at the start of the potential
1698 * parameter, with any whitespace already removed.
1699 *
1700 * "name" is the name of the parameter. The value is appended
1701 * to "out".
1702 */
1703 static int extract_param(const char *raw, const char *name,
1704 struct strbuf *out)
1705 {
1706 size_t len = strlen(name);
1707
1708 if (strncasecmp(raw, name, len))
1709 return -1;
1710 raw += len;
1711
1712 if (*raw != '=')
1713 return -1;
1714 raw++;
1715
1716 while (*raw && !isspace(*raw) && *raw != ';')
1717 strbuf_addch(out, *raw++);
1718 return 0;
1719 }
1720
1721 /*
1722 * Extract a normalized version of the content type, with any
1723 * spaces suppressed, all letters lowercased, and no trailing ";"
1724 * or parameters.
1725 *
1726 * Note that we will silently remove even invalid whitespace. For
1727 * example, "text / plain" is specifically forbidden by RFC 2616,
1728 * but "text/plain" is the only reasonable output, and this keeps
1729 * our code simple.
1730 *
1731 * If the "charset" argument is not NULL, store the value of any
1732 * charset parameter there.
1733 *
1734 * Example:
1735 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1736 * "text / plain" -> "text/plain"
1737 */
1738 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1739 struct strbuf *charset)
1740 {
1741 const char *p;
1742
1743 strbuf_reset(type);
1744 strbuf_grow(type, raw->len);
1745 for (p = raw->buf; *p; p++) {
1746 if (isspace(*p))
1747 continue;
1748 if (*p == ';') {
1749 p++;
1750 break;
1751 }
1752 strbuf_addch(type, tolower(*p));
1753 }
1754
1755 if (!charset)
1756 return;
1757
1758 strbuf_reset(charset);
1759 while (*p) {
1760 while (isspace(*p) || *p == ';')
1761 p++;
1762 if (!extract_param(p, "charset", charset))
1763 return;
1764 while (*p && !isspace(*p))
1765 p++;
1766 }
1767
1768 if (!charset->len && starts_with(type->buf, "text/"))
1769 strbuf_addstr(charset, "ISO-8859-1");
1770 }
1771
1772 static void write_accept_language(struct strbuf *buf)
1773 {
1774 /*
1775 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1776 * that, q-value will be smaller than 0.001, the minimum q-value the
1777 * HTTP specification allows. See
1778 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1779 */
1780 const int MAX_DECIMAL_PLACES = 3;
1781 const int MAX_LANGUAGE_TAGS = 1000;
1782 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1783 char **language_tags = NULL;
1784 int num_langs = 0;
1785 const char *s = get_preferred_languages();
1786 int i;
1787 struct strbuf tag = STRBUF_INIT;
1788
1789 /* Don't add Accept-Language header if no language is preferred. */
1790 if (!s)
1791 return;
1792
1793 /*
1794 * Split the colon-separated string of preferred languages into
1795 * language_tags array.
1796 */
1797 do {
1798 /* collect language tag */
1799 for (; *s && (isalnum(*s) || *s == '_'); s++)
1800 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1801
1802 /* skip .codeset, @modifier and any other unnecessary parts */
1803 while (*s && *s != ':')
1804 s++;
1805
1806 if (tag.len) {
1807 num_langs++;
1808 REALLOC_ARRAY(language_tags, num_langs);
1809 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1810 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1811 break;
1812 }
1813 } while (*s++);
1814
1815 /* write Accept-Language header into buf */
1816 if (num_langs) {
1817 int last_buf_len = 0;
1818 int max_q;
1819 int decimal_places;
1820 char q_format[32];
1821
1822 /* add '*' */
1823 REALLOC_ARRAY(language_tags, num_langs + 1);
1824 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1825
1826 /* compute decimal_places */
1827 for (max_q = 1, decimal_places = 0;
1828 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1829 decimal_places++, max_q *= 10)
1830 ;
1831
1832 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1833
1834 strbuf_addstr(buf, "Accept-Language: ");
1835
1836 for (i = 0; i < num_langs; i++) {
1837 if (i > 0)
1838 strbuf_addstr(buf, ", ");
1839
1840 strbuf_addstr(buf, language_tags[i]);
1841
1842 if (i > 0)
1843 strbuf_addf(buf, q_format, max_q - i);
1844
1845 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1846 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1847 break;
1848 }
1849
1850 last_buf_len = buf->len;
1851 }
1852 }
1853
1854 /* free language tags -- last one is a static '*' */
1855 for (i = 0; i < num_langs - 1; i++)
1856 free(language_tags[i]);
1857 free(language_tags);
1858 }
1859
1860 /*
1861 * Get an Accept-Language header which indicates user's preferred languages.
1862 *
1863 * Examples:
1864 * LANGUAGE= -> ""
1865 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1866 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1867 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1868 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1869 * LANGUAGE= LANG=C -> ""
1870 */
1871 const char *http_get_accept_language_header(void)
1872 {
1873 if (!cached_accept_language) {
1874 struct strbuf buf = STRBUF_INIT;
1875 write_accept_language(&buf);
1876 if (buf.len > 0)
1877 cached_accept_language = strbuf_detach(&buf, NULL);
1878 }
1879
1880 return cached_accept_language;
1881 }
1882
1883 static void http_opt_request_remainder(CURL *curl, off_t pos)
1884 {
1885 char buf[128];
1886 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1887 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1888 }
1889
1890 /* http_request() targets */
1891 #define HTTP_REQUEST_STRBUF 0
1892 #define HTTP_REQUEST_FILE 1
1893
1894 static int http_request(const char *url,
1895 void *result, int target,
1896 const struct http_get_options *options)
1897 {
1898 struct active_request_slot *slot;
1899 struct slot_results results;
1900 struct curl_slist *headers = http_copy_default_headers();
1901 struct strbuf buf = STRBUF_INIT;
1902 const char *accept_language;
1903 int ret;
1904
1905 slot = get_active_slot();
1906 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1907
1908 if (!result) {
1909 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1910 } else {
1911 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1912 curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, result);
1913
1914 if (target == HTTP_REQUEST_FILE) {
1915 off_t posn = ftello(result);
1916 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1917 fwrite);
1918 if (posn > 0)
1919 http_opt_request_remainder(slot->curl, posn);
1920 } else
1921 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1922 fwrite_buffer);
1923 }
1924
1925 accept_language = http_get_accept_language_header();
1926
1927 if (accept_language)
1928 headers = curl_slist_append(headers, accept_language);
1929
1930 strbuf_addstr(&buf, "Pragma:");
1931 if (options && options->no_cache)
1932 strbuf_addstr(&buf, " no-cache");
1933 if (options && options->initial_request &&
1934 http_follow_config == HTTP_FOLLOW_INITIAL)
1935 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1936
1937 headers = curl_slist_append(headers, buf.buf);
1938
1939 /* Add additional headers here */
1940 if (options && options->extra_headers) {
1941 const struct string_list_item *item;
1942 for_each_string_list_item(item, options->extra_headers) {
1943 headers = curl_slist_append(headers, item->string);
1944 }
1945 }
1946
1947 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1948 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1949 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1950 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1951
1952 ret = run_one_slot(slot, &results);
1953
1954 if (options && options->content_type) {
1955 struct strbuf raw = STRBUF_INIT;
1956 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1957 extract_content_type(&raw, options->content_type,
1958 options->charset);
1959 strbuf_release(&raw);
1960 }
1961
1962 if (options && options->effective_url)
1963 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1964 options->effective_url);
1965
1966 curl_slist_free_all(headers);
1967 strbuf_release(&buf);
1968
1969 return ret;
1970 }
1971
1972 /*
1973 * Update the "base" url to a more appropriate value, as deduced by
1974 * redirects seen when requesting a URL starting with "url".
1975 *
1976 * The "asked" parameter is a URL that we asked curl to access, and must begin
1977 * with "base".
1978 *
1979 * The "got" parameter is the URL that curl reported to us as where we ended
1980 * up.
1981 *
1982 * Returns 1 if we updated the base url, 0 otherwise.
1983 *
1984 * Our basic strategy is to compare "base" and "asked" to find the bits
1985 * specific to our request. We then strip those bits off of "got" to yield the
1986 * new base. So for example, if our base is "http://example.com/foo.git",
1987 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1988 * with "https://other.example.com/foo.git/info/refs". We would want the
1989 * new URL to become "https://other.example.com/foo.git".
1990 *
1991 * Note that this assumes a sane redirect scheme. It's entirely possible
1992 * in the example above to end up at a URL that does not even end in
1993 * "info/refs". In such a case we die. There's not much we can do, such a
1994 * scheme is unlikely to represent a real git repository, and failing to
1995 * rewrite the base opens options for malicious redirects to do funny things.
1996 */
1997 static int update_url_from_redirect(struct strbuf *base,
1998 const char *asked,
1999 const struct strbuf *got)
2000 {
2001 const char *tail;
2002 size_t new_len;
2003
2004 if (!strcmp(asked, got->buf))
2005 return 0;
2006
2007 if (!skip_prefix(asked, base->buf, &tail))
2008 BUG("update_url_from_redirect: %s is not a superset of %s",
2009 asked, base->buf);
2010
2011 new_len = got->len;
2012 if (!strip_suffix_mem(got->buf, &new_len, tail))
2013 die(_("unable to update url base from redirection:\n"
2014 " asked for: %s\n"
2015 " redirect: %s"),
2016 asked, got->buf);
2017
2018 strbuf_reset(base);
2019 strbuf_add(base, got->buf, new_len);
2020
2021 return 1;
2022 }
2023
2024 static int http_request_reauth(const char *url,
2025 void *result, int target,
2026 struct http_get_options *options)
2027 {
2028 int ret = http_request(url, result, target, options);
2029
2030 if (ret != HTTP_OK && ret != HTTP_REAUTH)
2031 return ret;
2032
2033 if (options && options->effective_url && options->base_url) {
2034 if (update_url_from_redirect(options->base_url,
2035 url, options->effective_url)) {
2036 credential_from_url(&http_auth, options->base_url->buf);
2037 url = options->effective_url->buf;
2038 }
2039 }
2040
2041 if (ret != HTTP_REAUTH)
2042 return ret;
2043
2044 /*
2045 * The previous request may have put cruft into our output stream; we
2046 * should clear it out before making our next request.
2047 */
2048 switch (target) {
2049 case HTTP_REQUEST_STRBUF:
2050 strbuf_reset(result);
2051 break;
2052 case HTTP_REQUEST_FILE:
2053 if (fflush(result)) {
2054 error_errno("unable to flush a file");
2055 return HTTP_START_FAILED;
2056 }
2057 rewind(result);
2058 if (ftruncate(fileno(result), 0) < 0) {
2059 error_errno("unable to truncate a file");
2060 return HTTP_START_FAILED;
2061 }
2062 break;
2063 default:
2064 BUG("Unknown http_request target");
2065 }
2066
2067 credential_fill(&http_auth);
2068
2069 return http_request(url, result, target, options);
2070 }
2071
2072 int http_get_strbuf(const char *url,
2073 struct strbuf *result,
2074 struct http_get_options *options)
2075 {
2076 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
2077 }
2078
2079 /*
2080 * Downloads a URL and stores the result in the given file.
2081 *
2082 * If a previous interrupted download is detected (i.e. a previous temporary
2083 * file is still around) the download is resumed.
2084 */
2085 int http_get_file(const char *url, const char *filename,
2086 struct http_get_options *options)
2087 {
2088 int ret;
2089 struct strbuf tmpfile = STRBUF_INIT;
2090 FILE *result;
2091
2092 strbuf_addf(&tmpfile, "%s.temp", filename);
2093 result = fopen(tmpfile.buf, "a");
2094 if (!result) {
2095 error("Unable to open local file %s", tmpfile.buf);
2096 ret = HTTP_ERROR;
2097 goto cleanup;
2098 }
2099
2100 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
2101 fclose(result);
2102
2103 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
2104 ret = HTTP_ERROR;
2105 cleanup:
2106 strbuf_release(&tmpfile);
2107 return ret;
2108 }
2109
2110 int http_fetch_ref(const char *base, struct ref *ref)
2111 {
2112 struct http_get_options options = {0};
2113 char *url;
2114 struct strbuf buffer = STRBUF_INIT;
2115 int ret = -1;
2116
2117 options.no_cache = 1;
2118
2119 url = quote_ref_url(base, ref->name);
2120 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
2121 strbuf_rtrim(&buffer);
2122 if (buffer.len == the_hash_algo->hexsz)
2123 ret = get_oid_hex(buffer.buf, &ref->old_oid);
2124 else if (starts_with(buffer.buf, "ref: ")) {
2125 ref->symref = xstrdup(buffer.buf + 5);
2126 ret = 0;
2127 }
2128 }
2129
2130 strbuf_release(&buffer);
2131 free(url);
2132 return ret;
2133 }
2134
2135 /* Helpers for fetching packs */
2136 static char *fetch_pack_index(unsigned char *hash, const char *base_url)
2137 {
2138 char *url, *tmp;
2139 struct strbuf buf = STRBUF_INIT;
2140
2141 if (http_is_verbose)
2142 fprintf(stderr, "Getting index for pack %s\n", hash_to_hex(hash));
2143
2144 end_url_with_slash(&buf, base_url);
2145 strbuf_addf(&buf, "objects/pack/pack-%s.idx", hash_to_hex(hash));
2146 url = strbuf_detach(&buf, NULL);
2147
2148 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(hash));
2149 tmp = strbuf_detach(&buf, NULL);
2150
2151 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
2152 error("Unable to get pack index %s", url);
2153 FREE_AND_NULL(tmp);
2154 }
2155
2156 free(url);
2157 return tmp;
2158 }
2159
2160 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
2161 unsigned char *sha1, const char *base_url)
2162 {
2163 struct packed_git *new_pack;
2164 char *tmp_idx = NULL;
2165 int ret;
2166
2167 if (has_pack_index(sha1)) {
2168 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
2169 if (!new_pack)
2170 return -1; /* parse_pack_index() already issued error message */
2171 goto add_pack;
2172 }
2173
2174 tmp_idx = fetch_pack_index(sha1, base_url);
2175 if (!tmp_idx)
2176 return -1;
2177
2178 new_pack = parse_pack_index(sha1, tmp_idx);
2179 if (!new_pack) {
2180 unlink(tmp_idx);
2181 free(tmp_idx);
2182
2183 return -1; /* parse_pack_index() already issued error message */
2184 }
2185
2186 ret = verify_pack_index(new_pack);
2187 if (!ret) {
2188 close_pack_index(new_pack);
2189 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
2190 }
2191 free(tmp_idx);
2192 if (ret)
2193 return -1;
2194
2195 add_pack:
2196 new_pack->next = *packs_head;
2197 *packs_head = new_pack;
2198 return 0;
2199 }
2200
2201 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
2202 {
2203 struct http_get_options options = {0};
2204 int ret = 0;
2205 char *url;
2206 const char *data;
2207 struct strbuf buf = STRBUF_INIT;
2208 struct object_id oid;
2209
2210 end_url_with_slash(&buf, base_url);
2211 strbuf_addstr(&buf, "objects/info/packs");
2212 url = strbuf_detach(&buf, NULL);
2213
2214 options.no_cache = 1;
2215 ret = http_get_strbuf(url, &buf, &options);
2216 if (ret != HTTP_OK)
2217 goto cleanup;
2218
2219 data = buf.buf;
2220 while (*data) {
2221 if (skip_prefix(data, "P pack-", &data) &&
2222 !parse_oid_hex(data, &oid, &data) &&
2223 skip_prefix(data, ".pack", &data) &&
2224 (*data == '\n' || *data == '\0')) {
2225 fetch_and_setup_pack_index(packs_head, oid.hash, base_url);
2226 } else {
2227 data = strchrnul(data, '\n');
2228 }
2229 if (*data)
2230 data++; /* skip past newline */
2231 }
2232
2233 cleanup:
2234 free(url);
2235 return ret;
2236 }
2237
2238 void release_http_pack_request(struct http_pack_request *preq)
2239 {
2240 if (preq->packfile) {
2241 fclose(preq->packfile);
2242 preq->packfile = NULL;
2243 }
2244 preq->slot = NULL;
2245 strbuf_release(&preq->tmpfile);
2246 free(preq->url);
2247 free(preq);
2248 }
2249
2250 static const char *default_index_pack_args[] =
2251 {"index-pack", "--stdin", NULL};
2252
2253 int finish_http_pack_request(struct http_pack_request *preq)
2254 {
2255 struct child_process ip = CHILD_PROCESS_INIT;
2256 int tmpfile_fd;
2257 int ret = 0;
2258
2259 fclose(preq->packfile);
2260 preq->packfile = NULL;
2261
2262 tmpfile_fd = xopen(preq->tmpfile.buf, O_RDONLY);
2263
2264 ip.git_cmd = 1;
2265 ip.in = tmpfile_fd;
2266 strvec_pushv(&ip.args, preq->index_pack_args ?
2267 preq->index_pack_args :
2268 default_index_pack_args);
2269
2270 if (preq->preserve_index_pack_stdout)
2271 ip.out = 0;
2272 else
2273 ip.no_stdout = 1;
2274
2275 if (run_command(&ip)) {
2276 ret = -1;
2277 goto cleanup;
2278 }
2279
2280 cleanup:
2281 close(tmpfile_fd);
2282 unlink(preq->tmpfile.buf);
2283 return ret;
2284 }
2285
2286 void http_install_packfile(struct packed_git *p,
2287 struct packed_git **list_to_remove_from)
2288 {
2289 struct packed_git **lst = list_to_remove_from;
2290
2291 while (*lst != p)
2292 lst = &((*lst)->next);
2293 *lst = (*lst)->next;
2294
2295 install_packed_git(the_repository, p);
2296 }
2297
2298 struct http_pack_request *new_http_pack_request(
2299 const unsigned char *packed_git_hash, const char *base_url) {
2300
2301 struct strbuf buf = STRBUF_INIT;
2302
2303 end_url_with_slash(&buf, base_url);
2304 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2305 hash_to_hex(packed_git_hash));
2306 return new_direct_http_pack_request(packed_git_hash,
2307 strbuf_detach(&buf, NULL));
2308 }
2309
2310 struct http_pack_request *new_direct_http_pack_request(
2311 const unsigned char *packed_git_hash, char *url)
2312 {
2313 off_t prev_posn = 0;
2314 struct http_pack_request *preq;
2315
2316 CALLOC_ARRAY(preq, 1);
2317 strbuf_init(&preq->tmpfile, 0);
2318
2319 preq->url = url;
2320
2321 strbuf_addf(&preq->tmpfile, "%s.temp", sha1_pack_name(packed_git_hash));
2322 preq->packfile = fopen(preq->tmpfile.buf, "a");
2323 if (!preq->packfile) {
2324 error("Unable to open local file %s for pack",
2325 preq->tmpfile.buf);
2326 goto abort;
2327 }
2328
2329 preq->slot = get_active_slot();
2330 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEDATA, preq->packfile);
2331 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2332 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2333 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2334 no_pragma_header);
2335
2336 /*
2337 * If there is data present from a previous transfer attempt,
2338 * resume where it left off
2339 */
2340 prev_posn = ftello(preq->packfile);
2341 if (prev_posn>0) {
2342 if (http_is_verbose)
2343 fprintf(stderr,
2344 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2345 hash_to_hex(packed_git_hash),
2346 (uintmax_t)prev_posn);
2347 http_opt_request_remainder(preq->slot->curl, prev_posn);
2348 }
2349
2350 return preq;
2351
2352 abort:
2353 strbuf_release(&preq->tmpfile);
2354 free(preq->url);
2355 free(preq);
2356 return NULL;
2357 }
2358
2359 /* Helpers for fetching objects (loose) */
2360 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2361 void *data)
2362 {
2363 unsigned char expn[4096];
2364 size_t size = eltsize * nmemb;
2365 int posn = 0;
2366 struct http_object_request *freq = data;
2367 struct active_request_slot *slot = freq->slot;
2368
2369 if (slot) {
2370 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2371 &slot->http_code);
2372 if (c != CURLE_OK)
2373 BUG("curl_easy_getinfo for HTTP code failed: %s",
2374 curl_easy_strerror(c));
2375 if (slot->http_code >= 300)
2376 return nmemb;
2377 }
2378
2379 do {
2380 ssize_t retval = xwrite(freq->localfile,
2381 (char *) ptr + posn, size - posn);
2382 if (retval < 0)
2383 return posn / eltsize;
2384 posn += retval;
2385 } while (posn < size);
2386
2387 freq->stream.avail_in = size;
2388 freq->stream.next_in = (void *)ptr;
2389 do {
2390 freq->stream.next_out = expn;
2391 freq->stream.avail_out = sizeof(expn);
2392 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2393 the_hash_algo->update_fn(&freq->c, expn,
2394 sizeof(expn) - freq->stream.avail_out);
2395 } while (freq->stream.avail_in && freq->zret == Z_OK);
2396 return nmemb;
2397 }
2398
2399 struct http_object_request *new_http_object_request(const char *base_url,
2400 const struct object_id *oid)
2401 {
2402 char *hex = oid_to_hex(oid);
2403 struct strbuf filename = STRBUF_INIT;
2404 struct strbuf prevfile = STRBUF_INIT;
2405 int prevlocal;
2406 char prev_buf[PREV_BUF_SIZE];
2407 ssize_t prev_read = 0;
2408 off_t prev_posn = 0;
2409 struct http_object_request *freq;
2410
2411 CALLOC_ARRAY(freq, 1);
2412 strbuf_init(&freq->tmpfile, 0);
2413 oidcpy(&freq->oid, oid);
2414 freq->localfile = -1;
2415
2416 loose_object_path(the_repository, &filename, oid);
2417 strbuf_addf(&freq->tmpfile, "%s.temp", filename.buf);
2418
2419 strbuf_addf(&prevfile, "%s.prev", filename.buf);
2420 unlink_or_warn(prevfile.buf);
2421 rename(freq->tmpfile.buf, prevfile.buf);
2422 unlink_or_warn(freq->tmpfile.buf);
2423 strbuf_release(&filename);
2424
2425 if (freq->localfile != -1)
2426 error("fd leakage in start: %d", freq->localfile);
2427 freq->localfile = open(freq->tmpfile.buf,
2428 O_WRONLY | O_CREAT | O_EXCL, 0666);
2429 /*
2430 * This could have failed due to the "lazy directory creation";
2431 * try to mkdir the last path component.
2432 */
2433 if (freq->localfile < 0 && errno == ENOENT) {
2434 char *dir = strrchr(freq->tmpfile.buf, '/');
2435 if (dir) {
2436 *dir = 0;
2437 mkdir(freq->tmpfile.buf, 0777);
2438 *dir = '/';
2439 }
2440 freq->localfile = open(freq->tmpfile.buf,
2441 O_WRONLY | O_CREAT | O_EXCL, 0666);
2442 }
2443
2444 if (freq->localfile < 0) {
2445 error_errno("Couldn't create temporary file %s",
2446 freq->tmpfile.buf);
2447 goto abort;
2448 }
2449
2450 git_inflate_init(&freq->stream);
2451
2452 the_hash_algo->init_fn(&freq->c);
2453
2454 freq->url = get_remote_object_url(base_url, hex, 0);
2455
2456 /*
2457 * If a previous temp file is present, process what was already
2458 * fetched.
2459 */
2460 prevlocal = open(prevfile.buf, O_RDONLY);
2461 if (prevlocal != -1) {
2462 do {
2463 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2464 if (prev_read>0) {
2465 if (fwrite_sha1_file(prev_buf,
2466 1,
2467 prev_read,
2468 freq) == prev_read) {
2469 prev_posn += prev_read;
2470 } else {
2471 prev_read = -1;
2472 }
2473 }
2474 } while (prev_read > 0);
2475 close(prevlocal);
2476 }
2477 unlink_or_warn(prevfile.buf);
2478 strbuf_release(&prevfile);
2479
2480 /*
2481 * Reset inflate/SHA1 if there was an error reading the previous temp
2482 * file; also rewind to the beginning of the local file.
2483 */
2484 if (prev_read == -1) {
2485 memset(&freq->stream, 0, sizeof(freq->stream));
2486 git_inflate_init(&freq->stream);
2487 the_hash_algo->init_fn(&freq->c);
2488 if (prev_posn>0) {
2489 prev_posn = 0;
2490 lseek(freq->localfile, 0, SEEK_SET);
2491 if (ftruncate(freq->localfile, 0) < 0) {
2492 error_errno("Couldn't truncate temporary file %s",
2493 freq->tmpfile.buf);
2494 goto abort;
2495 }
2496 }
2497 }
2498
2499 freq->slot = get_active_slot();
2500
2501 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEDATA, freq);
2502 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2503 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2504 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2505 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2506 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2507
2508 /*
2509 * If we have successfully processed data from a previous fetch
2510 * attempt, only fetch the data we don't already have.
2511 */
2512 if (prev_posn>0) {
2513 if (http_is_verbose)
2514 fprintf(stderr,
2515 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2516 hex, (uintmax_t)prev_posn);
2517 http_opt_request_remainder(freq->slot->curl, prev_posn);
2518 }
2519
2520 return freq;
2521
2522 abort:
2523 strbuf_release(&prevfile);
2524 free(freq->url);
2525 free(freq);
2526 return NULL;
2527 }
2528
2529 void process_http_object_request(struct http_object_request *freq)
2530 {
2531 if (!freq->slot)
2532 return;
2533 freq->curl_result = freq->slot->curl_result;
2534 freq->http_code = freq->slot->http_code;
2535 freq->slot = NULL;
2536 }
2537
2538 int finish_http_object_request(struct http_object_request *freq)
2539 {
2540 struct stat st;
2541 struct strbuf filename = STRBUF_INIT;
2542
2543 close(freq->localfile);
2544 freq->localfile = -1;
2545
2546 process_http_object_request(freq);
2547
2548 if (freq->http_code == 416) {
2549 warning("requested range invalid; we may already have all the data.");
2550 } else if (freq->curl_result != CURLE_OK) {
2551 if (stat(freq->tmpfile.buf, &st) == 0)
2552 if (st.st_size == 0)
2553 unlink_or_warn(freq->tmpfile.buf);
2554 return -1;
2555 }
2556
2557 git_inflate_end(&freq->stream);
2558 the_hash_algo->final_oid_fn(&freq->real_oid, &freq->c);
2559 if (freq->zret != Z_STREAM_END) {
2560 unlink_or_warn(freq->tmpfile.buf);
2561 return -1;
2562 }
2563 if (!oideq(&freq->oid, &freq->real_oid)) {
2564 unlink_or_warn(freq->tmpfile.buf);
2565 return -1;
2566 }
2567 loose_object_path(the_repository, &filename, &freq->oid);
2568 freq->rename = finalize_object_file(freq->tmpfile.buf, filename.buf);
2569 strbuf_release(&filename);
2570
2571 return freq->rename;
2572 }
2573
2574 void abort_http_object_request(struct http_object_request *freq)
2575 {
2576 unlink_or_warn(freq->tmpfile.buf);
2577
2578 release_http_object_request(freq);
2579 }
2580
2581 void release_http_object_request(struct http_object_request *freq)
2582 {
2583 if (freq->localfile != -1) {
2584 close(freq->localfile);
2585 freq->localfile = -1;
2586 }
2587 FREE_AND_NULL(freq->url);
2588 if (freq->slot) {
2589 freq->slot->callback_func = NULL;
2590 freq->slot->callback_data = NULL;
2591 release_active_slot(freq->slot);
2592 freq->slot = NULL;
2593 }
2594 strbuf_release(&freq->tmpfile);
2595 }
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