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The 19th batch
[git/gitster.git] / http.c
blob6c6cc5c822ad5ae741a9902aad35aa94cef2260d
1 #define USE_THE_REPOSITORY_VARIABLE
2
3 #include "git-compat-util.h"
4 #include "git-curl-compat.h"
5 #include "hex.h"
6 #include "http.h"
7 #include "config.h"
8 #include "pack.h"
9 #include "run-command.h"
10 #include "url.h"
11 #include "urlmatch.h"
12 #include "credential.h"
13 #include "version.h"
14 #include "pkt-line.h"
15 #include "gettext.h"
16 #include "trace.h"
17 #include "transport.h"
18 #include "packfile.h"
19 #include "string-list.h"
20 #include "object-file.h"
21 #include "object-store-ll.h"
22
23 static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
24 static int trace_curl_data = 1;
25 static int trace_curl_redact = 1;
26 long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
27 int active_requests;
28 int http_is_verbose;
29 ssize_t http_post_buffer = 16 * LARGE_PACKET_MAX;
30
31 static int min_curl_sessions = 1;
32 static int curl_session_count;
33 static int max_requests = -1;
34 static CURLM *curlm;
35 static CURL *curl_default;
36
37 #define PREV_BUF_SIZE 4096
38
39 char curl_errorstr[CURL_ERROR_SIZE];
40
41 static int curl_ssl_verify = -1;
42 static int curl_ssl_try;
43 static char *curl_http_version;
44 static char *ssl_cert;
45 static char *ssl_cert_type;
46 static char *ssl_cipherlist;
47 static char *ssl_version;
48 static struct {
49 const char *name;
50 long ssl_version;
51 } sslversions[] = {
52 { "sslv2", CURL_SSLVERSION_SSLv2 },
53 { "sslv3", CURL_SSLVERSION_SSLv3 },
54 { "tlsv1", CURL_SSLVERSION_TLSv1 },
55 #ifdef GIT_CURL_HAVE_CURL_SSLVERSION_TLSv1_0
56 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
57 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
58 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
59 #endif
60 #ifdef GIT_CURL_HAVE_CURL_SSLVERSION_TLSv1_3
61 { "tlsv1.3", CURL_SSLVERSION_TLSv1_3 },
62 #endif
63 };
64 static char *ssl_key;
65 static char *ssl_key_type;
66 static char *ssl_capath;
67 static char *curl_no_proxy;
68 #ifdef GIT_CURL_HAVE_CURLOPT_PINNEDPUBLICKEY
69 static char *ssl_pinnedkey;
70 #endif
71 static char *ssl_cainfo;
72 static long curl_low_speed_limit = -1;
73 static long curl_low_speed_time = -1;
74 static int curl_ftp_no_epsv;
75 static char *curl_http_proxy;
76 static char *http_proxy_authmethod;
77
78 static char *http_proxy_ssl_cert;
79 static char *http_proxy_ssl_key;
80 static char *http_proxy_ssl_ca_info;
81 static struct credential proxy_cert_auth = CREDENTIAL_INIT;
82 static int proxy_ssl_cert_password_required;
83
84 static struct {
85 const char *name;
86 long curlauth_param;
87 } proxy_authmethods[] = {
88 { "basic", CURLAUTH_BASIC },
89 { "digest", CURLAUTH_DIGEST },
90 { "negotiate", CURLAUTH_GSSNEGOTIATE },
91 { "ntlm", CURLAUTH_NTLM },
92 { "anyauth", CURLAUTH_ANY },
93 /*
94 * CURLAUTH_DIGEST_IE has no corresponding command-line option in
95 * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
96 * here, too
97 */
98 };
99 #ifdef CURLGSSAPI_DELEGATION_FLAG
100 static char *curl_deleg;
101 static struct {
102 const char *name;
103 long curl_deleg_param;
104 } curl_deleg_levels[] = {
105 { "none", CURLGSSAPI_DELEGATION_NONE },
106 { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
107 { "always", CURLGSSAPI_DELEGATION_FLAG },
108 };
109 #endif
110
111 enum proactive_auth {
112 PROACTIVE_AUTH_NONE = 0,
113 PROACTIVE_AUTH_IF_CREDENTIALS,
114 PROACTIVE_AUTH_AUTO,
115 PROACTIVE_AUTH_BASIC,
116 };
117
118 static struct credential proxy_auth = CREDENTIAL_INIT;
119 static const char *curl_proxyuserpwd;
120 static char *curl_cookie_file;
121 static int curl_save_cookies;
122 struct credential http_auth = CREDENTIAL_INIT;
123 static enum proactive_auth http_proactive_auth;
124 static char *user_agent;
125 static int curl_empty_auth = -1;
126
127 enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
128
129 static struct credential cert_auth = CREDENTIAL_INIT;
130 static int ssl_cert_password_required;
131 static unsigned long http_auth_methods = CURLAUTH_ANY;
132 static int http_auth_methods_restricted;
133 /* Modes for which empty_auth cannot actually help us. */
134 static unsigned long empty_auth_useless =
135 CURLAUTH_BASIC
136 | CURLAUTH_DIGEST_IE
137 | CURLAUTH_DIGEST;
138
139 static struct curl_slist *pragma_header;
140 static struct string_list extra_http_headers = STRING_LIST_INIT_DUP;
141
142 static struct curl_slist *host_resolutions;
143
144 static struct active_request_slot *active_queue_head;
145
146 static char *cached_accept_language;
147
148 static char *http_ssl_backend;
149
150 static int http_schannel_check_revoke = 1;
151 /*
152 * With the backend being set to `schannel`, setting sslCAinfo would override
153 * the Certificate Store in cURL v7.60.0 and later, which is not what we want
154 * by default.
155 */
156 static int http_schannel_use_ssl_cainfo;
157
158 static int always_auth_proactively(void)
159 {
160 return http_proactive_auth != PROACTIVE_AUTH_NONE &&
161 http_proactive_auth != PROACTIVE_AUTH_IF_CREDENTIALS;
162 }
163
164 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
165 {
166 size_t size = eltsize * nmemb;
167 struct buffer *buffer = buffer_;
168
169 if (size > buffer->buf.len - buffer->posn)
170 size = buffer->buf.len - buffer->posn;
171 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
172 buffer->posn += size;
173
174 return size / eltsize;
175 }
176
177 int seek_buffer(void *clientp, curl_off_t offset, int origin)
178 {
179 struct buffer *buffer = clientp;
180
181 if (origin != SEEK_SET)
182 BUG("seek_buffer only handles SEEK_SET");
183 if (offset < 0 || offset >= buffer->buf.len) {
184 error("curl seek would be outside of buffer");
185 return CURL_SEEKFUNC_FAIL;
186 }
187
188 buffer->posn = offset;
189 return CURL_SEEKFUNC_OK;
190 }
191
192 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
193 {
194 size_t size = eltsize * nmemb;
195 struct strbuf *buffer = buffer_;
196
197 strbuf_add(buffer, ptr, size);
198 return nmemb;
199 }
200
201 /*
202 * A folded header continuation line starts with any number of spaces or
203 * horizontal tab characters (SP or HTAB) as per RFC 7230 section 3.2.
204 * It is not a continuation line if the line starts with any other character.
205 */
206 static inline int is_hdr_continuation(const char *ptr, const size_t size)
207 {
208 return size && (*ptr == ' ' || *ptr == '\t');
209 }
210
211 static size_t fwrite_wwwauth(char *ptr, size_t eltsize, size_t nmemb, void *p UNUSED)
212 {
213 size_t size = eltsize * nmemb;
214 struct strvec *values = &http_auth.wwwauth_headers;
215 struct strbuf buf = STRBUF_INIT;
216 const char *val;
217 size_t val_len;
218
219 /*
220 * Header lines may not come NULL-terminated from libcurl so we must
221 * limit all scans to the maximum length of the header line, or leverage
222 * strbufs for all operations.
223 *
224 * In addition, it is possible that header values can be split over
225 * multiple lines as per RFC 7230. 'Line folding' has been deprecated
226 * but older servers may still emit them. A continuation header field
227 * value is identified as starting with a space or horizontal tab.
228 *
229 * The formal definition of a header field as given in RFC 7230 is:
230 *
231 * header-field = field-name ":" OWS field-value OWS
232 *
233 * field-name = token
234 * field-value = *( field-content / obs-fold )
235 * field-content = field-vchar [ 1*( SP / HTAB ) field-vchar ]
236 * field-vchar = VCHAR / obs-text
237 *
238 * obs-fold = CRLF 1*( SP / HTAB )
239 * ; obsolete line folding
240 * ; see Section 3.2.4
241 */
242
243 /* Start of a new WWW-Authenticate header */
244 if (skip_iprefix_mem(ptr, size, "www-authenticate:", &val, &val_len)) {
245 strbuf_add(&buf, val, val_len);
246
247 /*
248 * Strip the CRLF that should be present at the end of each
249 * field as well as any trailing or leading whitespace from the
250 * value.
251 */
252 strbuf_trim(&buf);
253
254 strvec_push(values, buf.buf);
255 http_auth.header_is_last_match = 1;
256 goto exit;
257 }
258
259 /*
260 * This line could be a continuation of the previously matched header
261 * field. If this is the case then we should append this value to the
262 * end of the previously consumed value.
263 */
264 if (http_auth.header_is_last_match && is_hdr_continuation(ptr, size)) {
265 /*
266 * Trim the CRLF and any leading or trailing from this line.
267 */
268 strbuf_add(&buf, ptr, size);
269 strbuf_trim(&buf);
270
271 /*
272 * At this point we should always have at least one existing
273 * value, even if it is empty. Do not bother appending the new
274 * value if this continuation header is itself empty.
275 */
276 if (!values->nr) {
277 BUG("should have at least one existing header value");
278 } else if (buf.len) {
279 char *prev = xstrdup(values->v[values->nr - 1]);
280
281 /* Join two non-empty values with a single space. */
282 const char *const sp = *prev ? " " : "";
283
284 strvec_pop(values);
285 strvec_pushf(values, "%s%s%s", prev, sp, buf.buf);
286 free(prev);
287 }
288
289 goto exit;
290 }
291
292 /* Not a continuation of a previously matched auth header line. */
293 http_auth.header_is_last_match = 0;
294
295 /*
296 * If this is a HTTP status line and not a header field, this signals
297 * a different HTTP response. libcurl writes all the output of all
298 * response headers of all responses, including redirects.
299 * We only care about the last HTTP request response's headers so clear
300 * the existing array.
301 */
302 if (skip_iprefix_mem(ptr, size, "http/", &val, &val_len))
303 strvec_clear(values);
304
305 exit:
306 strbuf_release(&buf);
307 return size;
308 }
309
310 size_t fwrite_null(char *ptr UNUSED, size_t eltsize UNUSED, size_t nmemb,
311 void *data UNUSED)
312 {
313 return nmemb;
314 }
315
316 static struct curl_slist *object_request_headers(void)
317 {
318 return curl_slist_append(http_copy_default_headers(), "Pragma:");
319 }
320
321 static void closedown_active_slot(struct active_request_slot *slot)
322 {
323 active_requests--;
324 slot->in_use = 0;
325 }
326
327 static void finish_active_slot(struct active_request_slot *slot)
328 {
329 closedown_active_slot(slot);
330 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
331
332 if (slot->finished)
333 (*slot->finished) = 1;
334
335 /* Store slot results so they can be read after the slot is reused */
336 if (slot->results) {
337 slot->results->curl_result = slot->curl_result;
338 slot->results->http_code = slot->http_code;
339 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
340 &slot->results->auth_avail);
341
342 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
343 &slot->results->http_connectcode);
344 }
345
346 /* Run callback if appropriate */
347 if (slot->callback_func)
348 slot->callback_func(slot->callback_data);
349 }
350
351 static void xmulti_remove_handle(struct active_request_slot *slot)
352 {
353 curl_multi_remove_handle(curlm, slot->curl);
354 }
355
356 static void process_curl_messages(void)
357 {
358 int num_messages;
359 struct active_request_slot *slot;
360 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
361
362 while (curl_message != NULL) {
363 if (curl_message->msg == CURLMSG_DONE) {
364 int curl_result = curl_message->data.result;
365 slot = active_queue_head;
366 while (slot != NULL &&
367 slot->curl != curl_message->easy_handle)
368 slot = slot->next;
369 if (slot) {
370 xmulti_remove_handle(slot);
371 slot->curl_result = curl_result;
372 finish_active_slot(slot);
373 } else {
374 fprintf(stderr, "Received DONE message for unknown request!\n");
375 }
376 } else {
377 fprintf(stderr, "Unknown CURL message received: %d\n",
378 (int)curl_message->msg);
379 }
380 curl_message = curl_multi_info_read(curlm, &num_messages);
381 }
382 }
383
384 static int http_options(const char *var, const char *value,
385 const struct config_context *ctx, void *data)
386 {
387 if (!strcmp("http.version", var)) {
388 return git_config_string(&curl_http_version, var, value);
389 }
390 if (!strcmp("http.sslverify", var)) {
391 curl_ssl_verify = git_config_bool(var, value);
392 return 0;
393 }
394 if (!strcmp("http.sslcipherlist", var))
395 return git_config_string(&ssl_cipherlist, var, value);
396 if (!strcmp("http.sslversion", var))
397 return git_config_string(&ssl_version, var, value);
398 if (!strcmp("http.sslcert", var))
399 return git_config_pathname(&ssl_cert, var, value);
400 if (!strcmp("http.sslcerttype", var))
401 return git_config_string(&ssl_cert_type, var, value);
402 if (!strcmp("http.sslkey", var))
403 return git_config_pathname(&ssl_key, var, value);
404 if (!strcmp("http.sslkeytype", var))
405 return git_config_string(&ssl_key_type, var, value);
406 if (!strcmp("http.sslcapath", var))
407 return git_config_pathname(&ssl_capath, var, value);
408 if (!strcmp("http.sslcainfo", var))
409 return git_config_pathname(&ssl_cainfo, var, value);
410 if (!strcmp("http.sslcertpasswordprotected", var)) {
411 ssl_cert_password_required = git_config_bool(var, value);
412 return 0;
413 }
414 if (!strcmp("http.ssltry", var)) {
415 curl_ssl_try = git_config_bool(var, value);
416 return 0;
417 }
418 if (!strcmp("http.sslbackend", var)) {
419 free(http_ssl_backend);
420 http_ssl_backend = xstrdup_or_null(value);
421 return 0;
422 }
423
424 if (!strcmp("http.schannelcheckrevoke", var)) {
425 http_schannel_check_revoke = git_config_bool(var, value);
426 return 0;
427 }
428
429 if (!strcmp("http.schannelusesslcainfo", var)) {
430 http_schannel_use_ssl_cainfo = git_config_bool(var, value);
431 return 0;
432 }
433
434 if (!strcmp("http.minsessions", var)) {
435 min_curl_sessions = git_config_int(var, value, ctx->kvi);
436 if (min_curl_sessions > 1)
437 min_curl_sessions = 1;
438 return 0;
439 }
440 if (!strcmp("http.maxrequests", var)) {
441 max_requests = git_config_int(var, value, ctx->kvi);
442 return 0;
443 }
444 if (!strcmp("http.lowspeedlimit", var)) {
445 curl_low_speed_limit = (long)git_config_int(var, value, ctx->kvi);
446 return 0;
447 }
448 if (!strcmp("http.lowspeedtime", var)) {
449 curl_low_speed_time = (long)git_config_int(var, value, ctx->kvi);
450 return 0;
451 }
452
453 if (!strcmp("http.noepsv", var)) {
454 curl_ftp_no_epsv = git_config_bool(var, value);
455 return 0;
456 }
457 if (!strcmp("http.proxy", var))
458 return git_config_string(&curl_http_proxy, var, value);
459
460 if (!strcmp("http.proxyauthmethod", var))
461 return git_config_string(&http_proxy_authmethod, var, value);
462
463 if (!strcmp("http.proxysslcert", var))
464 return git_config_string(&http_proxy_ssl_cert, var, value);
465
466 if (!strcmp("http.proxysslkey", var))
467 return git_config_string(&http_proxy_ssl_key, var, value);
468
469 if (!strcmp("http.proxysslcainfo", var))
470 return git_config_string(&http_proxy_ssl_ca_info, var, value);
471
472 if (!strcmp("http.proxysslcertpasswordprotected", var)) {
473 proxy_ssl_cert_password_required = git_config_bool(var, value);
474 return 0;
475 }
476
477 if (!strcmp("http.cookiefile", var))
478 return git_config_pathname(&curl_cookie_file, var, value);
479 if (!strcmp("http.savecookies", var)) {
480 curl_save_cookies = git_config_bool(var, value);
481 return 0;
482 }
483
484 if (!strcmp("http.postbuffer", var)) {
485 http_post_buffer = git_config_ssize_t(var, value, ctx->kvi);
486 if (http_post_buffer < 0)
487 warning(_("negative value for http.postBuffer; defaulting to %d"), LARGE_PACKET_MAX);
488 if (http_post_buffer < LARGE_PACKET_MAX)
489 http_post_buffer = LARGE_PACKET_MAX;
490 return 0;
491 }
492
493 if (!strcmp("http.useragent", var))
494 return git_config_string(&user_agent, var, value);
495
496 if (!strcmp("http.emptyauth", var)) {
497 if (value && !strcmp("auto", value))
498 curl_empty_auth = -1;
499 else
500 curl_empty_auth = git_config_bool(var, value);
501 return 0;
502 }
503
504 if (!strcmp("http.delegation", var)) {
505 #ifdef CURLGSSAPI_DELEGATION_FLAG
506 return git_config_string(&curl_deleg, var, value);
507 #else
508 warning(_("Delegation control is not supported with cURL < 7.22.0"));
509 return 0;
510 #endif
511 }
512
513 if (!strcmp("http.pinnedpubkey", var)) {
514 #ifdef GIT_CURL_HAVE_CURLOPT_PINNEDPUBLICKEY
515 return git_config_pathname(&ssl_pinnedkey, var, value);
516 #else
517 warning(_("Public key pinning not supported with cURL < 7.39.0"));
518 return 0;
519 #endif
520 }
521
522 if (!strcmp("http.extraheader", var)) {
523 if (!value) {
524 return config_error_nonbool(var);
525 } else if (!*value) {
526 string_list_clear(&extra_http_headers, 0);
527 } else {
528 string_list_append(&extra_http_headers, value);
529 }
530 return 0;
531 }
532
533 if (!strcmp("http.curloptresolve", var)) {
534 if (!value) {
535 return config_error_nonbool(var);
536 } else if (!*value) {
537 curl_slist_free_all(host_resolutions);
538 host_resolutions = NULL;
539 } else {
540 host_resolutions = curl_slist_append(host_resolutions, value);
541 }
542 return 0;
543 }
544
545 if (!strcmp("http.followredirects", var)) {
546 if (value && !strcmp(value, "initial"))
547 http_follow_config = HTTP_FOLLOW_INITIAL;
548 else if (git_config_bool(var, value))
549 http_follow_config = HTTP_FOLLOW_ALWAYS;
550 else
551 http_follow_config = HTTP_FOLLOW_NONE;
552 return 0;
553 }
554
555 if (!strcmp("http.proactiveauth", var)) {
556 if (!value)
557 return config_error_nonbool(var);
558 if (!strcmp(value, "auto"))
559 http_proactive_auth = PROACTIVE_AUTH_AUTO;
560 else if (!strcmp(value, "basic"))
561 http_proactive_auth = PROACTIVE_AUTH_BASIC;
562 else if (!strcmp(value, "none"))
563 http_proactive_auth = PROACTIVE_AUTH_NONE;
564 else
565 warning(_("Unknown value for http.proactiveauth"));
566 return 0;
567 }
568
569 /* Fall back on the default ones */
570 return git_default_config(var, value, ctx, data);
571 }
572
573 static int curl_empty_auth_enabled(void)
574 {
575 if (curl_empty_auth >= 0)
576 return curl_empty_auth;
577
578 /*
579 * In the automatic case, kick in the empty-auth
580 * hack as long as we would potentially try some
581 * method more exotic than "Basic" or "Digest".
582 *
583 * But only do this when this is our second or
584 * subsequent request, as by then we know what
585 * methods are available.
586 */
587 if (http_auth_methods_restricted &&
588 (http_auth_methods & ~empty_auth_useless))
589 return 1;
590 return 0;
591 }
592
593 struct curl_slist *http_append_auth_header(const struct credential *c,
594 struct curl_slist *headers)
595 {
596 if (c->authtype && c->credential) {
597 struct strbuf auth = STRBUF_INIT;
598 strbuf_addf(&auth, "Authorization: %s %s",
599 c->authtype, c->credential);
600 headers = curl_slist_append(headers, auth.buf);
601 strbuf_release(&auth);
602 }
603 return headers;
604 }
605
606 static void init_curl_http_auth(CURL *result)
607 {
608 if ((!http_auth.username || !*http_auth.username) &&
609 (!http_auth.credential || !*http_auth.credential)) {
610 int empty_auth = curl_empty_auth_enabled();
611 if ((empty_auth != -1 && !always_auth_proactively()) || empty_auth == 1) {
612 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
613 return;
614 } else if (!always_auth_proactively()) {
615 return;
616 } else if (http_proactive_auth == PROACTIVE_AUTH_BASIC) {
617 strvec_push(&http_auth.wwwauth_headers, "Basic");
618 }
619 }
620
621 credential_fill(&http_auth, 1);
622
623 if (http_auth.password) {
624 if (always_auth_proactively()) {
625 /*
626 * We got a credential without an authtype and we don't
627 * know what's available. Since our only two options at
628 * the moment are auto (which defaults to basic) and
629 * basic, use basic for now.
630 */
631 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
632 }
633 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
634 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
635 }
636 }
637
638 /* *var must be free-able */
639 static void var_override(char **var, char *value)
640 {
641 if (value) {
642 free(*var);
643 *var = xstrdup(value);
644 }
645 }
646
647 static void set_proxyauth_name_password(CURL *result)
648 {
649 if (proxy_auth.password) {
650 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
651 proxy_auth.username);
652 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
653 proxy_auth.password);
654 } else if (proxy_auth.authtype && proxy_auth.credential) {
655 curl_easy_setopt(result, CURLOPT_PROXYHEADER,
656 http_append_auth_header(&proxy_auth, NULL));
657 }
658 }
659
660 static void init_curl_proxy_auth(CURL *result)
661 {
662 if (proxy_auth.username) {
663 if (!proxy_auth.password && !proxy_auth.credential)
664 credential_fill(&proxy_auth, 1);
665 set_proxyauth_name_password(result);
666 }
667
668 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
669
670 if (http_proxy_authmethod) {
671 int i;
672 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
673 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
674 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
675 proxy_authmethods[i].curlauth_param);
676 break;
677 }
678 }
679 if (i == ARRAY_SIZE(proxy_authmethods)) {
680 warning("unsupported proxy authentication method %s: using anyauth",
681 http_proxy_authmethod);
682 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
683 }
684 }
685 else
686 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
687 }
688
689 static int has_cert_password(void)
690 {
691 if (ssl_cert == NULL || ssl_cert_password_required != 1)
692 return 0;
693 if (!cert_auth.password) {
694 cert_auth.protocol = xstrdup("cert");
695 cert_auth.host = xstrdup("");
696 cert_auth.username = xstrdup("");
697 cert_auth.path = xstrdup(ssl_cert);
698 credential_fill(&cert_auth, 0);
699 }
700 return 1;
701 }
702
703 #ifdef GIT_CURL_HAVE_CURLOPT_PROXY_KEYPASSWD
704 static int has_proxy_cert_password(void)
705 {
706 if (http_proxy_ssl_cert == NULL || proxy_ssl_cert_password_required != 1)
707 return 0;
708 if (!proxy_cert_auth.password) {
709 proxy_cert_auth.protocol = xstrdup("cert");
710 proxy_cert_auth.host = xstrdup("");
711 proxy_cert_auth.username = xstrdup("");
712 proxy_cert_auth.path = xstrdup(http_proxy_ssl_cert);
713 credential_fill(&proxy_cert_auth, 0);
714 }
715 return 1;
716 }
717 #endif
718
719 #ifdef GITCURL_HAVE_CURLOPT_TCP_KEEPALIVE
720 static void set_curl_keepalive(CURL *c)
721 {
722 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
723 }
724
725 #else
726 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
727 {
728 int ka = 1;
729 int rc;
730 socklen_t len = (socklen_t)sizeof(ka);
731
732 if (type != CURLSOCKTYPE_IPCXN)
733 return 0;
734
735 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
736 if (rc < 0)
737 warning_errno("unable to set SO_KEEPALIVE on socket");
738
739 return CURL_SOCKOPT_OK;
740 }
741
742 static void set_curl_keepalive(CURL *c)
743 {
744 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
745 }
746 #endif
747
748 /* Return 1 if redactions have been made, 0 otherwise. */
749 static int redact_sensitive_header(struct strbuf *header, size_t offset)
750 {
751 int ret = 0;
752 const char *sensitive_header;
753
754 if (trace_curl_redact &&
755 (skip_iprefix(header->buf + offset, "Authorization:", &sensitive_header) ||
756 skip_iprefix(header->buf + offset, "Proxy-Authorization:", &sensitive_header))) {
757 /* The first token is the type, which is OK to log */
758 while (isspace(*sensitive_header))
759 sensitive_header++;
760 while (*sensitive_header && !isspace(*sensitive_header))
761 sensitive_header++;
762 /* Everything else is opaque and possibly sensitive */
763 strbuf_setlen(header, sensitive_header - header->buf);
764 strbuf_addstr(header, " <redacted>");
765 ret = 1;
766 } else if (trace_curl_redact &&
767 skip_iprefix(header->buf + offset, "Cookie:", &sensitive_header)) {
768 struct strbuf redacted_header = STRBUF_INIT;
769 const char *cookie;
770
771 while (isspace(*sensitive_header))
772 sensitive_header++;
773
774 cookie = sensitive_header;
775
776 while (cookie) {
777 char *equals;
778 char *semicolon = strstr(cookie, "; ");
779 if (semicolon)
780 *semicolon = 0;
781 equals = strchrnul(cookie, '=');
782 if (!equals) {
783 /* invalid cookie, just append and continue */
784 strbuf_addstr(&redacted_header, cookie);
785 continue;
786 }
787 strbuf_add(&redacted_header, cookie, equals - cookie);
788 strbuf_addstr(&redacted_header, "=<redacted>");
789 if (semicolon) {
790 /*
791 * There are more cookies. (Or, for some
792 * reason, the input string ends in "; ".)
793 */
794 strbuf_addstr(&redacted_header, "; ");
795 cookie = semicolon + strlen("; ");
796 } else {
797 cookie = NULL;
798 }
799 }
800
801 strbuf_setlen(header, sensitive_header - header->buf);
802 strbuf_addbuf(header, &redacted_header);
803 ret = 1;
804 }
805 return ret;
806 }
807
808 static int match_curl_h2_trace(const char *line, const char **out)
809 {
810 const char *p;
811
812 /*
813 * curl prior to 8.1.0 gives us:
814 *
815 * h2h3 [<header-name>: <header-val>]
816 *
817 * Starting in 8.1.0, the first token became just "h2".
818 */
819 if (skip_iprefix(line, "h2h3 [", out) ||
820 skip_iprefix(line, "h2 [", out))
821 return 1;
822
823 /*
824 * curl 8.3.0 uses:
825 * [HTTP/2] [<stream-id>] [<header-name>: <header-val>]
826 * where <stream-id> is numeric.
827 */
828 if (skip_iprefix(line, "[HTTP/2] [", &p)) {
829 while (isdigit(*p))
830 p++;
831 if (skip_prefix(p, "] [", out))
832 return 1;
833 }
834
835 return 0;
836 }
837
838 /* Redact headers in info */
839 static void redact_sensitive_info_header(struct strbuf *header)
840 {
841 const char *sensitive_header;
842
843 if (trace_curl_redact &&
844 match_curl_h2_trace(header->buf, &sensitive_header)) {
845 if (redact_sensitive_header(header, sensitive_header - header->buf)) {
846 /* redaction ate our closing bracket */
847 strbuf_addch(header, ']');
848 }
849 }
850 }
851
852 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
853 {
854 struct strbuf out = STRBUF_INIT;
855 struct strbuf **headers, **header;
856
857 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
858 text, (long)size, (long)size);
859 trace_strbuf(&trace_curl, &out);
860 strbuf_reset(&out);
861 strbuf_add(&out, ptr, size);
862 headers = strbuf_split_max(&out, '\n', 0);
863
864 for (header = headers; *header; header++) {
865 if (hide_sensitive_header)
866 redact_sensitive_header(*header, 0);
867 strbuf_insertstr((*header), 0, text);
868 strbuf_insertstr((*header), strlen(text), ": ");
869 strbuf_rtrim((*header));
870 strbuf_addch((*header), '\n');
871 trace_strbuf(&trace_curl, (*header));
872 }
873 strbuf_list_free(headers);
874 strbuf_release(&out);
875 }
876
877 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
878 {
879 size_t i;
880 struct strbuf out = STRBUF_INIT;
881 unsigned int width = 60;
882
883 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
884 text, (long)size, (long)size);
885 trace_strbuf(&trace_curl, &out);
886
887 for (i = 0; i < size; i += width) {
888 size_t w;
889
890 strbuf_reset(&out);
891 strbuf_addf(&out, "%s: ", text);
892 for (w = 0; (w < width) && (i + w < size); w++) {
893 unsigned char ch = ptr[i + w];
894
895 strbuf_addch(&out,
896 (ch >= 0x20) && (ch < 0x80)
897 ? ch : '.');
898 }
899 strbuf_addch(&out, '\n');
900 trace_strbuf(&trace_curl, &out);
901 }
902 strbuf_release(&out);
903 }
904
905 static void curl_dump_info(char *data, size_t size)
906 {
907 struct strbuf buf = STRBUF_INIT;
908
909 strbuf_add(&buf, data, size);
910
911 redact_sensitive_info_header(&buf);
912 trace_printf_key(&trace_curl, "== Info: %s", buf.buf);
913
914 strbuf_release(&buf);
915 }
916
917 static int curl_trace(CURL *handle UNUSED, curl_infotype type,
918 char *data, size_t size,
919 void *userp UNUSED)
920 {
921 const char *text;
922 enum { NO_FILTER = 0, DO_FILTER = 1 };
923
924 switch (type) {
925 case CURLINFO_TEXT:
926 curl_dump_info(data, size);
927 break;
928 case CURLINFO_HEADER_OUT:
929 text = "=> Send header";
930 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
931 break;
932 case CURLINFO_DATA_OUT:
933 if (trace_curl_data) {
934 text = "=> Send data";
935 curl_dump_data(text, (unsigned char *)data, size);
936 }
937 break;
938 case CURLINFO_SSL_DATA_OUT:
939 if (trace_curl_data) {
940 text = "=> Send SSL data";
941 curl_dump_data(text, (unsigned char *)data, size);
942 }
943 break;
944 case CURLINFO_HEADER_IN:
945 text = "<= Recv header";
946 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
947 break;
948 case CURLINFO_DATA_IN:
949 if (trace_curl_data) {
950 text = "<= Recv data";
951 curl_dump_data(text, (unsigned char *)data, size);
952 }
953 break;
954 case CURLINFO_SSL_DATA_IN:
955 if (trace_curl_data) {
956 text = "<= Recv SSL data";
957 curl_dump_data(text, (unsigned char *)data, size);
958 }
959 break;
960
961 default: /* we ignore unknown types by default */
962 return 0;
963 }
964 return 0;
965 }
966
967 void http_trace_curl_no_data(void)
968 {
969 trace_override_envvar(&trace_curl, "1");
970 trace_curl_data = 0;
971 }
972
973 void setup_curl_trace(CURL *handle)
974 {
975 if (!trace_want(&trace_curl))
976 return;
977 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
978 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
979 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
980 }
981
982 static void proto_list_append(struct strbuf *list, const char *proto)
983 {
984 if (!list)
985 return;
986 if (list->len)
987 strbuf_addch(list, ',');
988 strbuf_addstr(list, proto);
989 }
990
991 static long get_curl_allowed_protocols(int from_user, struct strbuf *list)
992 {
993 long bits = 0;
994
995 if (is_transport_allowed("http", from_user)) {
996 bits |= CURLPROTO_HTTP;
997 proto_list_append(list, "http");
998 }
999 if (is_transport_allowed("https", from_user)) {
1000 bits |= CURLPROTO_HTTPS;
1001 proto_list_append(list, "https");
1002 }
1003 if (is_transport_allowed("ftp", from_user)) {
1004 bits |= CURLPROTO_FTP;
1005 proto_list_append(list, "ftp");
1006 }
1007 if (is_transport_allowed("ftps", from_user)) {
1008 bits |= CURLPROTO_FTPS;
1009 proto_list_append(list, "ftps");
1010 }
1011
1012 return bits;
1013 }
1014
1015 #ifdef GIT_CURL_HAVE_CURL_HTTP_VERSION_2
1016 static int get_curl_http_version_opt(const char *version_string, long *opt)
1017 {
1018 int i;
1019 static struct {
1020 const char *name;
1021 long opt_token;
1022 } choice[] = {
1023 { "HTTP/1.1", CURL_HTTP_VERSION_1_1 },
1024 { "HTTP/2", CURL_HTTP_VERSION_2 }
1025 };
1026
1027 for (i = 0; i < ARRAY_SIZE(choice); i++) {
1028 if (!strcmp(version_string, choice[i].name)) {
1029 *opt = choice[i].opt_token;
1030 return 0;
1031 }
1032 }
1033
1034 warning("unknown value given to http.version: '%s'", version_string);
1035 return -1; /* not found */
1036 }
1037
1038 #endif
1039
1040 static CURL *get_curl_handle(void)
1041 {
1042 CURL *result = curl_easy_init();
1043
1044 if (!result)
1045 die("curl_easy_init failed");
1046
1047 if (!curl_ssl_verify) {
1048 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
1049 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
1050 } else {
1051 /* Verify authenticity of the peer's certificate */
1052 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
1053 /* The name in the cert must match whom we tried to connect */
1054 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
1055 }
1056
1057 #ifdef GIT_CURL_HAVE_CURL_HTTP_VERSION_2
1058 if (curl_http_version) {
1059 long opt;
1060 if (!get_curl_http_version_opt(curl_http_version, &opt)) {
1061 /* Set request use http version */
1062 curl_easy_setopt(result, CURLOPT_HTTP_VERSION, opt);
1063 }
1064 }
1065 #endif
1066
1067 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
1068 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
1069
1070 #ifdef CURLGSSAPI_DELEGATION_FLAG
1071 if (curl_deleg) {
1072 int i;
1073 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
1074 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
1075 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
1076 curl_deleg_levels[i].curl_deleg_param);
1077 break;
1078 }
1079 }
1080 if (i == ARRAY_SIZE(curl_deleg_levels))
1081 warning("Unknown delegation method '%s': using default",
1082 curl_deleg);
1083 }
1084 #endif
1085
1086 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
1087 !http_schannel_check_revoke) {
1088 #ifdef GIT_CURL_HAVE_CURLSSLOPT_NO_REVOKE
1089 curl_easy_setopt(result, CURLOPT_SSL_OPTIONS, CURLSSLOPT_NO_REVOKE);
1090 #else
1091 warning(_("CURLSSLOPT_NO_REVOKE not supported with cURL < 7.44.0"));
1092 #endif
1093 }
1094
1095 if (http_proactive_auth != PROACTIVE_AUTH_NONE)
1096 init_curl_http_auth(result);
1097
1098 if (getenv("GIT_SSL_VERSION"))
1099 ssl_version = getenv("GIT_SSL_VERSION");
1100 if (ssl_version && *ssl_version) {
1101 int i;
1102 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
1103 if (!strcmp(ssl_version, sslversions[i].name)) {
1104 curl_easy_setopt(result, CURLOPT_SSLVERSION,
1105 sslversions[i].ssl_version);
1106 break;
1107 }
1108 }
1109 if (i == ARRAY_SIZE(sslversions))
1110 warning("unsupported ssl version %s: using default",
1111 ssl_version);
1112 }
1113
1114 if (getenv("GIT_SSL_CIPHER_LIST"))
1115 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
1116 if (ssl_cipherlist != NULL && *ssl_cipherlist)
1117 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
1118 ssl_cipherlist);
1119
1120 if (ssl_cert)
1121 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
1122 if (ssl_cert_type)
1123 curl_easy_setopt(result, CURLOPT_SSLCERTTYPE, ssl_cert_type);
1124 if (has_cert_password())
1125 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
1126 if (ssl_key)
1127 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
1128 if (ssl_key_type)
1129 curl_easy_setopt(result, CURLOPT_SSLKEYTYPE, ssl_key_type);
1130 if (ssl_capath)
1131 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
1132 #ifdef GIT_CURL_HAVE_CURLOPT_PINNEDPUBLICKEY
1133 if (ssl_pinnedkey)
1134 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
1135 #endif
1136 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
1137 !http_schannel_use_ssl_cainfo) {
1138 curl_easy_setopt(result, CURLOPT_CAINFO, NULL);
1139 #ifdef GIT_CURL_HAVE_CURLOPT_PROXY_CAINFO
1140 curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, NULL);
1141 #endif
1142 } else if (ssl_cainfo != NULL || http_proxy_ssl_ca_info != NULL) {
1143 if (ssl_cainfo)
1144 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
1145 #ifdef GIT_CURL_HAVE_CURLOPT_PROXY_CAINFO
1146 if (http_proxy_ssl_ca_info)
1147 curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, http_proxy_ssl_ca_info);
1148 #endif
1149 }
1150
1151 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
1152 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
1153 curl_low_speed_limit);
1154 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
1155 curl_low_speed_time);
1156 }
1157
1158 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
1159 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
1160
1161 #ifdef GIT_CURL_HAVE_CURLOPT_PROTOCOLS_STR
1162 {
1163 struct strbuf buf = STRBUF_INIT;
1164
1165 get_curl_allowed_protocols(0, &buf);
1166 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS_STR, buf.buf);
1167 strbuf_reset(&buf);
1168
1169 get_curl_allowed_protocols(-1, &buf);
1170 curl_easy_setopt(result, CURLOPT_PROTOCOLS_STR, buf.buf);
1171 strbuf_release(&buf);
1172 }
1173 #else
1174 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
1175 get_curl_allowed_protocols(0, NULL));
1176 curl_easy_setopt(result, CURLOPT_PROTOCOLS,
1177 get_curl_allowed_protocols(-1, NULL));
1178 #endif
1179
1180 if (getenv("GIT_CURL_VERBOSE"))
1181 http_trace_curl_no_data();
1182 setup_curl_trace(result);
1183 if (getenv("GIT_TRACE_CURL_NO_DATA"))
1184 trace_curl_data = 0;
1185 if (!git_env_bool("GIT_TRACE_REDACT", 1))
1186 trace_curl_redact = 0;
1187
1188 curl_easy_setopt(result, CURLOPT_USERAGENT,
1189 user_agent ? user_agent : git_user_agent());
1190
1191 if (curl_ftp_no_epsv)
1192 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
1193
1194 if (curl_ssl_try)
1195 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
1196
1197 /*
1198 * CURL also examines these variables as a fallback; but we need to query
1199 * them here in order to decide whether to prompt for missing password (cf.
1200 * init_curl_proxy_auth()).
1201 *
1202 * Unlike many other common environment variables, these are historically
1203 * lowercase only. It appears that CURL did not know this and implemented
1204 * only uppercase variants, which was later corrected to take both - with
1205 * the exception of http_proxy, which is lowercase only also in CURL. As
1206 * the lowercase versions are the historical quasi-standard, they take
1207 * precedence here, as in CURL.
1208 */
1209 if (!curl_http_proxy) {
1210 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
1211 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
1212 var_override(&curl_http_proxy, getenv("https_proxy"));
1213 } else {
1214 var_override(&curl_http_proxy, getenv("http_proxy"));
1215 }
1216 if (!curl_http_proxy) {
1217 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
1218 var_override(&curl_http_proxy, getenv("all_proxy"));
1219 }
1220 }
1221
1222 if (curl_http_proxy && curl_http_proxy[0] == '\0') {
1223 /*
1224 * Handle case with the empty http.proxy value here to keep
1225 * common code clean.
1226 * NB: empty option disables proxying at all.
1227 */
1228 curl_easy_setopt(result, CURLOPT_PROXY, "");
1229 } else if (curl_http_proxy) {
1230 struct strbuf proxy = STRBUF_INIT;
1231
1232 if (starts_with(curl_http_proxy, "socks5h"))
1233 curl_easy_setopt(result,
1234 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
1235 else if (starts_with(curl_http_proxy, "socks5"))
1236 curl_easy_setopt(result,
1237 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
1238 else if (starts_with(curl_http_proxy, "socks4a"))
1239 curl_easy_setopt(result,
1240 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
1241 else if (starts_with(curl_http_proxy, "socks"))
1242 curl_easy_setopt(result,
1243 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
1244 #ifdef GIT_CURL_HAVE_CURLOPT_PROXY_KEYPASSWD
1245 else if (starts_with(curl_http_proxy, "https")) {
1246 curl_easy_setopt(result, CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
1247
1248 if (http_proxy_ssl_cert)
1249 curl_easy_setopt(result, CURLOPT_PROXY_SSLCERT, http_proxy_ssl_cert);
1250
1251 if (http_proxy_ssl_key)
1252 curl_easy_setopt(result, CURLOPT_PROXY_SSLKEY, http_proxy_ssl_key);
1253
1254 if (has_proxy_cert_password())
1255 curl_easy_setopt(result, CURLOPT_PROXY_KEYPASSWD, proxy_cert_auth.password);
1256 }
1257 #endif
1258 if (strstr(curl_http_proxy, "://"))
1259 credential_from_url(&proxy_auth, curl_http_proxy);
1260 else {
1261 struct strbuf url = STRBUF_INIT;
1262 strbuf_addf(&url, "http://%s", curl_http_proxy);
1263 credential_from_url(&proxy_auth, url.buf);
1264 strbuf_release(&url);
1265 }
1266
1267 if (!proxy_auth.host)
1268 die("Invalid proxy URL '%s'", curl_http_proxy);
1269
1270 strbuf_addstr(&proxy, proxy_auth.host);
1271 if (proxy_auth.path) {
1272 curl_version_info_data *ver = curl_version_info(CURLVERSION_NOW);
1273
1274 if (ver->version_num < 0x075400)
1275 die("libcurl 7.84 or later is required to support paths in proxy URLs");
1276
1277 if (!starts_with(proxy_auth.protocol, "socks"))
1278 die("Invalid proxy URL '%s': only SOCKS proxies support paths",
1279 curl_http_proxy);
1280
1281 if (strcasecmp(proxy_auth.host, "localhost"))
1282 die("Invalid proxy URL '%s': host must be localhost if a path is present",
1283 curl_http_proxy);
1284
1285 strbuf_addch(&proxy, '/');
1286 strbuf_add_percentencode(&proxy, proxy_auth.path, 0);
1287 }
1288 curl_easy_setopt(result, CURLOPT_PROXY, proxy.buf);
1289 strbuf_release(&proxy);
1290
1291 var_override(&curl_no_proxy, getenv("NO_PROXY"));
1292 var_override(&curl_no_proxy, getenv("no_proxy"));
1293 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
1294 }
1295 init_curl_proxy_auth(result);
1296
1297 set_curl_keepalive(result);
1298
1299 return result;
1300 }
1301
1302 static void set_from_env(char **var, const char *envname)
1303 {
1304 const char *val = getenv(envname);
1305 if (val) {
1306 FREE_AND_NULL(*var);
1307 *var = xstrdup(val);
1308 }
1309 }
1310
1311 void http_init(struct remote *remote, const char *url, int proactive_auth)
1312 {
1313 char *low_speed_limit;
1314 char *low_speed_time;
1315 char *normalized_url;
1316 struct urlmatch_config config = URLMATCH_CONFIG_INIT;
1317
1318 config.section = "http";
1319 config.key = NULL;
1320 config.collect_fn = http_options;
1321 config.cascade_fn = git_default_config;
1322 config.cb = NULL;
1323
1324 http_is_verbose = 0;
1325 normalized_url = url_normalize(url, &config.url);
1326
1327 git_config(urlmatch_config_entry, &config);
1328 free(normalized_url);
1329 string_list_clear(&config.vars, 1);
1330
1331 #ifdef GIT_CURL_HAVE_CURLSSLSET_NO_BACKENDS
1332 if (http_ssl_backend) {
1333 const curl_ssl_backend **backends;
1334 struct strbuf buf = STRBUF_INIT;
1335 int i;
1336
1337 switch (curl_global_sslset(-1, http_ssl_backend, &backends)) {
1338 case CURLSSLSET_UNKNOWN_BACKEND:
1339 strbuf_addf(&buf, _("Unsupported SSL backend '%s'. "
1340 "Supported SSL backends:"),
1341 http_ssl_backend);
1342 for (i = 0; backends[i]; i++)
1343 strbuf_addf(&buf, "\n\t%s", backends[i]->name);
1344 die("%s", buf.buf);
1345 case CURLSSLSET_NO_BACKENDS:
1346 die(_("Could not set SSL backend to '%s': "
1347 "cURL was built without SSL backends"),
1348 http_ssl_backend);
1349 case CURLSSLSET_TOO_LATE:
1350 die(_("Could not set SSL backend to '%s': already set"),
1351 http_ssl_backend);
1352 case CURLSSLSET_OK:
1353 break; /* Okay! */
1354 }
1355 }
1356 #endif
1357
1358 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1359 die("curl_global_init failed");
1360
1361 if (proactive_auth && http_proactive_auth == PROACTIVE_AUTH_NONE)
1362 http_proactive_auth = PROACTIVE_AUTH_IF_CREDENTIALS;
1363
1364 if (remote && remote->http_proxy)
1365 curl_http_proxy = xstrdup(remote->http_proxy);
1366
1367 if (remote)
1368 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
1369
1370 pragma_header = curl_slist_append(http_copy_default_headers(),
1371 "Pragma: no-cache");
1372
1373 {
1374 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1375 if (http_max_requests)
1376 max_requests = atoi(http_max_requests);
1377 }
1378
1379 curlm = curl_multi_init();
1380 if (!curlm)
1381 die("curl_multi_init failed");
1382
1383 if (getenv("GIT_SSL_NO_VERIFY"))
1384 curl_ssl_verify = 0;
1385
1386 set_from_env(&ssl_cert, "GIT_SSL_CERT");
1387 set_from_env(&ssl_cert_type, "GIT_SSL_CERT_TYPE");
1388 set_from_env(&ssl_key, "GIT_SSL_KEY");
1389 set_from_env(&ssl_key_type, "GIT_SSL_KEY_TYPE");
1390 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
1391 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
1392
1393 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
1394
1395 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1396 if (low_speed_limit)
1397 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1398 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1399 if (low_speed_time)
1400 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1401
1402 if (curl_ssl_verify == -1)
1403 curl_ssl_verify = 1;
1404
1405 curl_session_count = 0;
1406 if (max_requests < 1)
1407 max_requests = DEFAULT_MAX_REQUESTS;
1408
1409 set_from_env(&http_proxy_ssl_cert, "GIT_PROXY_SSL_CERT");
1410 set_from_env(&http_proxy_ssl_key, "GIT_PROXY_SSL_KEY");
1411 set_from_env(&http_proxy_ssl_ca_info, "GIT_PROXY_SSL_CAINFO");
1412
1413 if (getenv("GIT_PROXY_SSL_CERT_PASSWORD_PROTECTED"))
1414 proxy_ssl_cert_password_required = 1;
1415
1416 if (getenv("GIT_CURL_FTP_NO_EPSV"))
1417 curl_ftp_no_epsv = 1;
1418
1419 if (url) {
1420 credential_from_url(&http_auth, url);
1421 if (!ssl_cert_password_required &&
1422 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1423 starts_with(url, "https://"))
1424 ssl_cert_password_required = 1;
1425 }
1426
1427 curl_default = get_curl_handle();
1428 }
1429
1430 void http_cleanup(void)
1431 {
1432 struct active_request_slot *slot = active_queue_head;
1433
1434 while (slot != NULL) {
1435 struct active_request_slot *next = slot->next;
1436 if (slot->curl) {
1437 xmulti_remove_handle(slot);
1438 curl_easy_cleanup(slot->curl);
1439 }
1440 free(slot);
1441 slot = next;
1442 }
1443 active_queue_head = NULL;
1444
1445 curl_easy_cleanup(curl_default);
1446
1447 curl_multi_cleanup(curlm);
1448 curl_global_cleanup();
1449
1450 string_list_clear(&extra_http_headers, 0);
1451
1452 curl_slist_free_all(pragma_header);
1453 pragma_header = NULL;
1454
1455 curl_slist_free_all(host_resolutions);
1456 host_resolutions = NULL;
1457
1458 if (curl_http_proxy) {
1459 free((void *)curl_http_proxy);
1460 curl_http_proxy = NULL;
1461 }
1462
1463 if (proxy_auth.password) {
1464 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1465 FREE_AND_NULL(proxy_auth.password);
1466 }
1467
1468 free((void *)curl_proxyuserpwd);
1469 curl_proxyuserpwd = NULL;
1470
1471 free((void *)http_proxy_authmethod);
1472 http_proxy_authmethod = NULL;
1473
1474 if (cert_auth.password) {
1475 memset(cert_auth.password, 0, strlen(cert_auth.password));
1476 FREE_AND_NULL(cert_auth.password);
1477 }
1478 ssl_cert_password_required = 0;
1479
1480 if (proxy_cert_auth.password) {
1481 memset(proxy_cert_auth.password, 0, strlen(proxy_cert_auth.password));
1482 FREE_AND_NULL(proxy_cert_auth.password);
1483 }
1484 proxy_ssl_cert_password_required = 0;
1485
1486 FREE_AND_NULL(cached_accept_language);
1487 }
1488
1489 struct active_request_slot *get_active_slot(void)
1490 {
1491 struct active_request_slot *slot = active_queue_head;
1492 struct active_request_slot *newslot;
1493
1494 int num_transfers;
1495
1496 /* Wait for a slot to open up if the queue is full */
1497 while (active_requests >= max_requests) {
1498 curl_multi_perform(curlm, &num_transfers);
1499 if (num_transfers < active_requests)
1500 process_curl_messages();
1501 }
1502
1503 while (slot != NULL && slot->in_use)
1504 slot = slot->next;
1505
1506 if (!slot) {
1507 newslot = xmalloc(sizeof(*newslot));
1508 newslot->curl = NULL;
1509 newslot->in_use = 0;
1510 newslot->next = NULL;
1511
1512 slot = active_queue_head;
1513 if (!slot) {
1514 active_queue_head = newslot;
1515 } else {
1516 while (slot->next != NULL)
1517 slot = slot->next;
1518 slot->next = newslot;
1519 }
1520 slot = newslot;
1521 }
1522
1523 if (!slot->curl) {
1524 slot->curl = curl_easy_duphandle(curl_default);
1525 curl_session_count++;
1526 }
1527
1528 active_requests++;
1529 slot->in_use = 1;
1530 slot->results = NULL;
1531 slot->finished = NULL;
1532 slot->callback_data = NULL;
1533 slot->callback_func = NULL;
1534
1535 if (curl_cookie_file && !strcmp(curl_cookie_file, "-")) {
1536 warning(_("refusing to read cookies from http.cookiefile '-'"));
1537 FREE_AND_NULL(curl_cookie_file);
1538 }
1539 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1540 if (curl_save_cookies && (!curl_cookie_file || !curl_cookie_file[0])) {
1541 curl_save_cookies = 0;
1542 warning(_("ignoring http.savecookies for empty http.cookiefile"));
1543 }
1544 if (curl_save_cookies)
1545 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1546 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1547 curl_easy_setopt(slot->curl, CURLOPT_RESOLVE, host_resolutions);
1548 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1549 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1550 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1551 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1552 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1553 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, -1L);
1554 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1555 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1556 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1557 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1558
1559 /*
1560 * Default following to off unless "ALWAYS" is configured; this gives
1561 * callers a sane starting point, and they can tweak for individual
1562 * HTTP_FOLLOW_* cases themselves.
1563 */
1564 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1565 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1566 else
1567 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1568
1569 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1570 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1571 if (http_auth.password || http_auth.credential || curl_empty_auth_enabled())
1572 init_curl_http_auth(slot->curl);
1573
1574 return slot;
1575 }
1576
1577 int start_active_slot(struct active_request_slot *slot)
1578 {
1579 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1580 int num_transfers;
1581
1582 if (curlm_result != CURLM_OK &&
1583 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1584 warning("curl_multi_add_handle failed: %s",
1585 curl_multi_strerror(curlm_result));
1586 active_requests--;
1587 slot->in_use = 0;
1588 return 0;
1589 }
1590
1591 /*
1592 * We know there must be something to do, since we just added
1593 * something.
1594 */
1595 curl_multi_perform(curlm, &num_transfers);
1596 return 1;
1597 }
1598
1599 struct fill_chain {
1600 void *data;
1601 int (*fill)(void *);
1602 struct fill_chain *next;
1603 };
1604
1605 static struct fill_chain *fill_cfg;
1606
1607 void add_fill_function(void *data, int (*fill)(void *))
1608 {
1609 struct fill_chain *new_fill = xmalloc(sizeof(*new_fill));
1610 struct fill_chain **linkp = &fill_cfg;
1611 new_fill->data = data;
1612 new_fill->fill = fill;
1613 new_fill->next = NULL;
1614 while (*linkp)
1615 linkp = &(*linkp)->next;
1616 *linkp = new_fill;
1617 }
1618
1619 void fill_active_slots(void)
1620 {
1621 struct active_request_slot *slot = active_queue_head;
1622
1623 while (active_requests < max_requests) {
1624 struct fill_chain *fill;
1625 for (fill = fill_cfg; fill; fill = fill->next)
1626 if (fill->fill(fill->data))
1627 break;
1628
1629 if (!fill)
1630 break;
1631 }
1632
1633 while (slot != NULL) {
1634 if (!slot->in_use && slot->curl != NULL
1635 && curl_session_count > min_curl_sessions) {
1636 curl_easy_cleanup(slot->curl);
1637 slot->curl = NULL;
1638 curl_session_count--;
1639 }
1640 slot = slot->next;
1641 }
1642 }
1643
1644 void step_active_slots(void)
1645 {
1646 int num_transfers;
1647 CURLMcode curlm_result;
1648
1649 do {
1650 curlm_result = curl_multi_perform(curlm, &num_transfers);
1651 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1652 if (num_transfers < active_requests) {
1653 process_curl_messages();
1654 fill_active_slots();
1655 }
1656 }
1657
1658 void run_active_slot(struct active_request_slot *slot)
1659 {
1660 fd_set readfds;
1661 fd_set writefds;
1662 fd_set excfds;
1663 int max_fd;
1664 struct timeval select_timeout;
1665 int finished = 0;
1666
1667 slot->finished = &finished;
1668 while (!finished) {
1669 step_active_slots();
1670
1671 if (slot->in_use) {
1672 long curl_timeout;
1673 curl_multi_timeout(curlm, &curl_timeout);
1674 if (curl_timeout == 0) {
1675 continue;
1676 } else if (curl_timeout == -1) {
1677 select_timeout.tv_sec = 0;
1678 select_timeout.tv_usec = 50000;
1679 } else {
1680 select_timeout.tv_sec = curl_timeout / 1000;
1681 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1682 }
1683
1684 max_fd = -1;
1685 FD_ZERO(&readfds);
1686 FD_ZERO(&writefds);
1687 FD_ZERO(&excfds);
1688 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1689
1690 /*
1691 * It can happen that curl_multi_timeout returns a pathologically
1692 * long timeout when curl_multi_fdset returns no file descriptors
1693 * to read. See commit message for more details.
1694 */
1695 if (max_fd < 0 &&
1696 (select_timeout.tv_sec > 0 ||
1697 select_timeout.tv_usec > 50000)) {
1698 select_timeout.tv_sec = 0;
1699 select_timeout.tv_usec = 50000;
1700 }
1701
1702 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1703 }
1704 }
1705
1706 /*
1707 * The value of slot->finished we set before the loop was used
1708 * to set our "finished" variable when our request completed.
1709 *
1710 * 1. The slot may not have been reused for another requst
1711 * yet, in which case it still has &finished.
1712 *
1713 * 2. The slot may already be in-use to serve another request,
1714 * which can further be divided into two cases:
1715 *
1716 * (a) If call run_active_slot() hasn't been called for that
1717 * other request, slot->finished would have been cleared
1718 * by get_active_slot() and has NULL.
1719 *
1720 * (b) If the request did call run_active_slot(), then the
1721 * call would have updated slot->finished at the beginning
1722 * of this function, and with the clearing of the member
1723 * below, we would find that slot->finished is now NULL.
1724 *
1725 * In all cases, slot->finished has no useful information to
1726 * anybody at this point. Some compilers warn us for
1727 * attempting to smuggle a pointer that is about to become
1728 * invalid, i.e. &finished. We clear it here to assure them.
1729 */
1730 slot->finished = NULL;
1731 }
1732
1733 static void release_active_slot(struct active_request_slot *slot)
1734 {
1735 closedown_active_slot(slot);
1736 if (slot->curl) {
1737 xmulti_remove_handle(slot);
1738 if (curl_session_count > min_curl_sessions) {
1739 curl_easy_cleanup(slot->curl);
1740 slot->curl = NULL;
1741 curl_session_count--;
1742 }
1743 }
1744 fill_active_slots();
1745 }
1746
1747 void finish_all_active_slots(void)
1748 {
1749 struct active_request_slot *slot = active_queue_head;
1750
1751 while (slot != NULL)
1752 if (slot->in_use) {
1753 run_active_slot(slot);
1754 slot = active_queue_head;
1755 } else {
1756 slot = slot->next;
1757 }
1758 }
1759
1760 /* Helpers for modifying and creating URLs */
1761 static inline int needs_quote(int ch)
1762 {
1763 if (((ch >= 'A') && (ch <= 'Z'))
1764 || ((ch >= 'a') && (ch <= 'z'))
1765 || ((ch >= '0') && (ch <= '9'))
1766 || (ch == '/')
1767 || (ch == '-')
1768 || (ch == '.'))
1769 return 0;
1770 return 1;
1771 }
1772
1773 static char *quote_ref_url(const char *base, const char *ref)
1774 {
1775 struct strbuf buf = STRBUF_INIT;
1776 const char *cp;
1777 int ch;
1778
1779 end_url_with_slash(&buf, base);
1780
1781 for (cp = ref; (ch = *cp) != 0; cp++)
1782 if (needs_quote(ch))
1783 strbuf_addf(&buf, "%%%02x", ch);
1784 else
1785 strbuf_addch(&buf, *cp);
1786
1787 return strbuf_detach(&buf, NULL);
1788 }
1789
1790 void append_remote_object_url(struct strbuf *buf, const char *url,
1791 const char *hex,
1792 int only_two_digit_prefix)
1793 {
1794 end_url_with_slash(buf, url);
1795
1796 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1797 if (!only_two_digit_prefix)
1798 strbuf_addstr(buf, hex + 2);
1799 }
1800
1801 char *get_remote_object_url(const char *url, const char *hex,
1802 int only_two_digit_prefix)
1803 {
1804 struct strbuf buf = STRBUF_INIT;
1805 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1806 return strbuf_detach(&buf, NULL);
1807 }
1808
1809 void normalize_curl_result(CURLcode *result, long http_code,
1810 char *errorstr, size_t errorlen)
1811 {
1812 /*
1813 * If we see a failing http code with CURLE_OK, we have turned off
1814 * FAILONERROR (to keep the server's custom error response), and should
1815 * translate the code into failure here.
1816 *
1817 * Likewise, if we see a redirect (30x code), that means we turned off
1818 * redirect-following, and we should treat the result as an error.
1819 */
1820 if (*result == CURLE_OK && http_code >= 300) {
1821 *result = CURLE_HTTP_RETURNED_ERROR;
1822 /*
1823 * Normally curl will already have put the "reason phrase"
1824 * from the server into curl_errorstr; unfortunately without
1825 * FAILONERROR it is lost, so we can give only the numeric
1826 * status code.
1827 */
1828 xsnprintf(errorstr, errorlen,
1829 "The requested URL returned error: %ld",
1830 http_code);
1831 }
1832 }
1833
1834 static int handle_curl_result(struct slot_results *results)
1835 {
1836 normalize_curl_result(&results->curl_result, results->http_code,
1837 curl_errorstr, sizeof(curl_errorstr));
1838
1839 if (results->curl_result == CURLE_OK) {
1840 credential_approve(&http_auth);
1841 credential_approve(&proxy_auth);
1842 credential_approve(&cert_auth);
1843 return HTTP_OK;
1844 } else if (results->curl_result == CURLE_SSL_CERTPROBLEM) {
1845 /*
1846 * We can't tell from here whether it's a bad path, bad
1847 * certificate, bad password, or something else wrong
1848 * with the certificate. So we reject the credential to
1849 * avoid caching or saving a bad password.
1850 */
1851 credential_reject(&cert_auth);
1852 return HTTP_NOAUTH;
1853 #ifdef GIT_CURL_HAVE_CURLE_SSL_PINNEDPUBKEYNOTMATCH
1854 } else if (results->curl_result == CURLE_SSL_PINNEDPUBKEYNOTMATCH) {
1855 return HTTP_NOMATCHPUBLICKEY;
1856 #endif
1857 } else if (missing_target(results))
1858 return HTTP_MISSING_TARGET;
1859 else if (results->http_code == 401) {
1860 if ((http_auth.username && http_auth.password) ||\
1861 (http_auth.authtype && http_auth.credential)) {
1862 if (http_auth.multistage) {
1863 credential_clear_secrets(&http_auth);
1864 return HTTP_REAUTH;
1865 }
1866 credential_reject(&http_auth);
1867 if (always_auth_proactively())
1868 http_proactive_auth = PROACTIVE_AUTH_NONE;
1869 return HTTP_NOAUTH;
1870 } else {
1871 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1872 if (results->auth_avail) {
1873 http_auth_methods &= results->auth_avail;
1874 http_auth_methods_restricted = 1;
1875 }
1876 return HTTP_REAUTH;
1877 }
1878 } else {
1879 if (results->http_connectcode == 407)
1880 credential_reject(&proxy_auth);
1881 if (!curl_errorstr[0])
1882 strlcpy(curl_errorstr,
1883 curl_easy_strerror(results->curl_result),
1884 sizeof(curl_errorstr));
1885 return HTTP_ERROR;
1886 }
1887 }
1888
1889 int run_one_slot(struct active_request_slot *slot,
1890 struct slot_results *results)
1891 {
1892 slot->results = results;
1893 if (!start_active_slot(slot)) {
1894 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1895 "failed to start HTTP request");
1896 return HTTP_START_FAILED;
1897 }
1898
1899 run_active_slot(slot);
1900 return handle_curl_result(results);
1901 }
1902
1903 struct curl_slist *http_copy_default_headers(void)
1904 {
1905 struct curl_slist *headers = NULL;
1906 const struct string_list_item *item;
1907
1908 for_each_string_list_item(item, &extra_http_headers)
1909 headers = curl_slist_append(headers, item->string);
1910
1911 return headers;
1912 }
1913
1914 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1915 {
1916 char *ptr;
1917 CURLcode ret;
1918
1919 strbuf_reset(buf);
1920 ret = curl_easy_getinfo(curl, info, &ptr);
1921 if (!ret && ptr)
1922 strbuf_addstr(buf, ptr);
1923 return ret;
1924 }
1925
1926 /*
1927 * Check for and extract a content-type parameter. "raw"
1928 * should be positioned at the start of the potential
1929 * parameter, with any whitespace already removed.
1930 *
1931 * "name" is the name of the parameter. The value is appended
1932 * to "out".
1933 */
1934 static int extract_param(const char *raw, const char *name,
1935 struct strbuf *out)
1936 {
1937 size_t len = strlen(name);
1938
1939 if (strncasecmp(raw, name, len))
1940 return -1;
1941 raw += len;
1942
1943 if (*raw != '=')
1944 return -1;
1945 raw++;
1946
1947 while (*raw && !isspace(*raw) && *raw != ';')
1948 strbuf_addch(out, *raw++);
1949 return 0;
1950 }
1951
1952 /*
1953 * Extract a normalized version of the content type, with any
1954 * spaces suppressed, all letters lowercased, and no trailing ";"
1955 * or parameters.
1956 *
1957 * Note that we will silently remove even invalid whitespace. For
1958 * example, "text / plain" is specifically forbidden by RFC 2616,
1959 * but "text/plain" is the only reasonable output, and this keeps
1960 * our code simple.
1961 *
1962 * If the "charset" argument is not NULL, store the value of any
1963 * charset parameter there.
1964 *
1965 * Example:
1966 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1967 * "text / plain" -> "text/plain"
1968 */
1969 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1970 struct strbuf *charset)
1971 {
1972 const char *p;
1973
1974 strbuf_reset(type);
1975 strbuf_grow(type, raw->len);
1976 for (p = raw->buf; *p; p++) {
1977 if (isspace(*p))
1978 continue;
1979 if (*p == ';') {
1980 p++;
1981 break;
1982 }
1983 strbuf_addch(type, tolower(*p));
1984 }
1985
1986 if (!charset)
1987 return;
1988
1989 strbuf_reset(charset);
1990 while (*p) {
1991 while (isspace(*p) || *p == ';')
1992 p++;
1993 if (!extract_param(p, "charset", charset))
1994 return;
1995 while (*p && !isspace(*p))
1996 p++;
1997 }
1998
1999 if (!charset->len && starts_with(type->buf, "text/"))
2000 strbuf_addstr(charset, "ISO-8859-1");
2001 }
2002
2003 static void write_accept_language(struct strbuf *buf)
2004 {
2005 /*
2006 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
2007 * that, q-value will be smaller than 0.001, the minimum q-value the
2008 * HTTP specification allows. See
2009 * https://datatracker.ietf.org/doc/html/rfc7231#section-5.3.1 for q-value.
2010 */
2011 const int MAX_DECIMAL_PLACES = 3;
2012 const int MAX_LANGUAGE_TAGS = 1000;
2013 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
2014 char **language_tags = NULL;
2015 int num_langs = 0;
2016 const char *s = get_preferred_languages();
2017 int i;
2018 struct strbuf tag = STRBUF_INIT;
2019
2020 /* Don't add Accept-Language header if no language is preferred. */
2021 if (!s)
2022 return;
2023
2024 /*
2025 * Split the colon-separated string of preferred languages into
2026 * language_tags array.
2027 */
2028 do {
2029 /* collect language tag */
2030 for (; *s && (isalnum(*s) || *s == '_'); s++)
2031 strbuf_addch(&tag, *s == '_' ? '-' : *s);
2032
2033 /* skip .codeset, @modifier and any other unnecessary parts */
2034 while (*s && *s != ':')
2035 s++;
2036
2037 if (tag.len) {
2038 num_langs++;
2039 REALLOC_ARRAY(language_tags, num_langs);
2040 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
2041 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
2042 break;
2043 }
2044 } while (*s++);
2045
2046 /* write Accept-Language header into buf */
2047 if (num_langs) {
2048 int last_buf_len = 0;
2049 int max_q;
2050 int decimal_places;
2051 char q_format[32];
2052
2053 /* add '*' */
2054 REALLOC_ARRAY(language_tags, num_langs + 1);
2055 language_tags[num_langs++] = xstrdup("*");
2056
2057 /* compute decimal_places */
2058 for (max_q = 1, decimal_places = 0;
2059 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
2060 decimal_places++, max_q *= 10)
2061 ;
2062
2063 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
2064
2065 strbuf_addstr(buf, "Accept-Language: ");
2066
2067 for (i = 0; i < num_langs; i++) {
2068 if (i > 0)
2069 strbuf_addstr(buf, ", ");
2070
2071 strbuf_addstr(buf, language_tags[i]);
2072
2073 if (i > 0)
2074 strbuf_addf(buf, q_format, max_q - i);
2075
2076 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
2077 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
2078 break;
2079 }
2080
2081 last_buf_len = buf->len;
2082 }
2083 }
2084
2085 for (i = 0; i < num_langs; i++)
2086 free(language_tags[i]);
2087 free(language_tags);
2088 }
2089
2090 /*
2091 * Get an Accept-Language header which indicates user's preferred languages.
2092 *
2093 * Examples:
2094 * LANGUAGE= -> ""
2095 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
2096 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
2097 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
2098 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
2099 * LANGUAGE= LANG=C -> ""
2100 */
2101 const char *http_get_accept_language_header(void)
2102 {
2103 if (!cached_accept_language) {
2104 struct strbuf buf = STRBUF_INIT;
2105 write_accept_language(&buf);
2106 if (buf.len > 0)
2107 cached_accept_language = strbuf_detach(&buf, NULL);
2108 }
2109
2110 return cached_accept_language;
2111 }
2112
2113 static void http_opt_request_remainder(CURL *curl, off_t pos)
2114 {
2115 char buf[128];
2116 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
2117 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
2118 }
2119
2120 /* http_request() targets */
2121 #define HTTP_REQUEST_STRBUF 0
2122 #define HTTP_REQUEST_FILE 1
2123
2124 static int http_request(const char *url,
2125 void *result, int target,
2126 const struct http_get_options *options)
2127 {
2128 struct active_request_slot *slot;
2129 struct slot_results results;
2130 struct curl_slist *headers = http_copy_default_headers();
2131 struct strbuf buf = STRBUF_INIT;
2132 const char *accept_language;
2133 int ret;
2134
2135 slot = get_active_slot();
2136 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
2137
2138 if (!result) {
2139 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
2140 } else {
2141 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
2142 curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, result);
2143
2144 if (target == HTTP_REQUEST_FILE) {
2145 off_t posn = ftello(result);
2146 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
2147 fwrite);
2148 if (posn > 0)
2149 http_opt_request_remainder(slot->curl, posn);
2150 } else
2151 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
2152 fwrite_buffer);
2153 }
2154
2155 curl_easy_setopt(slot->curl, CURLOPT_HEADERFUNCTION, fwrite_wwwauth);
2156
2157 accept_language = http_get_accept_language_header();
2158
2159 if (accept_language)
2160 headers = curl_slist_append(headers, accept_language);
2161
2162 strbuf_addstr(&buf, "Pragma:");
2163 if (options && options->no_cache)
2164 strbuf_addstr(&buf, " no-cache");
2165 if (options && options->initial_request &&
2166 http_follow_config == HTTP_FOLLOW_INITIAL)
2167 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
2168
2169 headers = curl_slist_append(headers, buf.buf);
2170
2171 /* Add additional headers here */
2172 if (options && options->extra_headers) {
2173 const struct string_list_item *item;
2174 if (options && options->extra_headers) {
2175 for_each_string_list_item(item, options->extra_headers) {
2176 headers = curl_slist_append(headers, item->string);
2177 }
2178 }
2179 }
2180
2181 headers = http_append_auth_header(&http_auth, headers);
2182
2183 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2184 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
2185 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
2186 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
2187
2188 ret = run_one_slot(slot, &results);
2189
2190 if (options && options->content_type) {
2191 struct strbuf raw = STRBUF_INIT;
2192 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
2193 extract_content_type(&raw, options->content_type,
2194 options->charset);
2195 strbuf_release(&raw);
2196 }
2197
2198 if (options && options->effective_url)
2199 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
2200 options->effective_url);
2201
2202 curl_slist_free_all(headers);
2203 strbuf_release(&buf);
2204
2205 return ret;
2206 }
2207
2208 /*
2209 * Update the "base" url to a more appropriate value, as deduced by
2210 * redirects seen when requesting a URL starting with "url".
2211 *
2212 * The "asked" parameter is a URL that we asked curl to access, and must begin
2213 * with "base".
2214 *
2215 * The "got" parameter is the URL that curl reported to us as where we ended
2216 * up.
2217 *
2218 * Returns 1 if we updated the base url, 0 otherwise.
2219 *
2220 * Our basic strategy is to compare "base" and "asked" to find the bits
2221 * specific to our request. We then strip those bits off of "got" to yield the
2222 * new base. So for example, if our base is "http://example.com/foo.git",
2223 * and we ask for "http://example.com/foo.git/info/refs", we might end up
2224 * with "https://other.example.com/foo.git/info/refs". We would want the
2225 * new URL to become "https://other.example.com/foo.git".
2226 *
2227 * Note that this assumes a sane redirect scheme. It's entirely possible
2228 * in the example above to end up at a URL that does not even end in
2229 * "info/refs". In such a case we die. There's not much we can do, such a
2230 * scheme is unlikely to represent a real git repository, and failing to
2231 * rewrite the base opens options for malicious redirects to do funny things.
2232 */
2233 static int update_url_from_redirect(struct strbuf *base,
2234 const char *asked,
2235 const struct strbuf *got)
2236 {
2237 const char *tail;
2238 size_t new_len;
2239
2240 if (!strcmp(asked, got->buf))
2241 return 0;
2242
2243 if (!skip_prefix(asked, base->buf, &tail))
2244 BUG("update_url_from_redirect: %s is not a superset of %s",
2245 asked, base->buf);
2246
2247 new_len = got->len;
2248 if (!strip_suffix_mem(got->buf, &new_len, tail))
2249 die(_("unable to update url base from redirection:\n"
2250 " asked for: %s\n"
2251 " redirect: %s"),
2252 asked, got->buf);
2253
2254 strbuf_reset(base);
2255 strbuf_add(base, got->buf, new_len);
2256
2257 return 1;
2258 }
2259
2260 static int http_request_reauth(const char *url,
2261 void *result, int target,
2262 struct http_get_options *options)
2263 {
2264 int i = 3;
2265 int ret;
2266
2267 if (always_auth_proactively())
2268 credential_fill(&http_auth, 1);
2269
2270 ret = http_request(url, result, target, options);
2271
2272 if (ret != HTTP_OK && ret != HTTP_REAUTH)
2273 return ret;
2274
2275 if (options && options->effective_url && options->base_url) {
2276 if (update_url_from_redirect(options->base_url,
2277 url, options->effective_url)) {
2278 credential_from_url(&http_auth, options->base_url->buf);
2279 url = options->effective_url->buf;
2280 }
2281 }
2282
2283 while (ret == HTTP_REAUTH && --i) {
2284 /*
2285 * The previous request may have put cruft into our output stream; we
2286 * should clear it out before making our next request.
2287 */
2288 switch (target) {
2289 case HTTP_REQUEST_STRBUF:
2290 strbuf_reset(result);
2291 break;
2292 case HTTP_REQUEST_FILE:
2293 if (fflush(result)) {
2294 error_errno("unable to flush a file");
2295 return HTTP_START_FAILED;
2296 }
2297 rewind(result);
2298 if (ftruncate(fileno(result), 0) < 0) {
2299 error_errno("unable to truncate a file");
2300 return HTTP_START_FAILED;
2301 }
2302 break;
2303 default:
2304 BUG("Unknown http_request target");
2305 }
2306
2307 credential_fill(&http_auth, 1);
2308
2309 ret = http_request(url, result, target, options);
2310 }
2311 return ret;
2312 }
2313
2314 int http_get_strbuf(const char *url,
2315 struct strbuf *result,
2316 struct http_get_options *options)
2317 {
2318 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
2319 }
2320
2321 /*
2322 * Downloads a URL and stores the result in the given file.
2323 *
2324 * If a previous interrupted download is detected (i.e. a previous temporary
2325 * file is still around) the download is resumed.
2326 */
2327 int http_get_file(const char *url, const char *filename,
2328 struct http_get_options *options)
2329 {
2330 int ret;
2331 struct strbuf tmpfile = STRBUF_INIT;
2332 FILE *result;
2333
2334 strbuf_addf(&tmpfile, "%s.temp", filename);
2335 result = fopen(tmpfile.buf, "a");
2336 if (!result) {
2337 error("Unable to open local file %s", tmpfile.buf);
2338 ret = HTTP_ERROR;
2339 goto cleanup;
2340 }
2341
2342 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
2343 fclose(result);
2344
2345 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
2346 ret = HTTP_ERROR;
2347 cleanup:
2348 strbuf_release(&tmpfile);
2349 return ret;
2350 }
2351
2352 int http_fetch_ref(const char *base, struct ref *ref)
2353 {
2354 struct http_get_options options = {0};
2355 char *url;
2356 struct strbuf buffer = STRBUF_INIT;
2357 int ret = -1;
2358
2359 options.no_cache = 1;
2360
2361 url = quote_ref_url(base, ref->name);
2362 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
2363 strbuf_rtrim(&buffer);
2364 if (buffer.len == the_hash_algo->hexsz)
2365 ret = get_oid_hex(buffer.buf, &ref->old_oid);
2366 else if (starts_with(buffer.buf, "ref: ")) {
2367 ref->symref = xstrdup(buffer.buf + 5);
2368 ret = 0;
2369 }
2370 }
2371
2372 strbuf_release(&buffer);
2373 free(url);
2374 return ret;
2375 }
2376
2377 /* Helpers for fetching packs */
2378 static char *fetch_pack_index(unsigned char *hash, const char *base_url)
2379 {
2380 char *url, *tmp;
2381 struct strbuf buf = STRBUF_INIT;
2382
2383 if (http_is_verbose)
2384 fprintf(stderr, "Getting index for pack %s\n", hash_to_hex(hash));
2385
2386 end_url_with_slash(&buf, base_url);
2387 strbuf_addf(&buf, "objects/pack/pack-%s.idx", hash_to_hex(hash));
2388 url = strbuf_detach(&buf, NULL);
2389
2390 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(hash));
2391 tmp = strbuf_detach(&buf, NULL);
2392
2393 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
2394 error("Unable to get pack index %s", url);
2395 FREE_AND_NULL(tmp);
2396 }
2397
2398 free(url);
2399 return tmp;
2400 }
2401
2402 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
2403 unsigned char *sha1, const char *base_url)
2404 {
2405 struct packed_git *new_pack;
2406 char *tmp_idx = NULL;
2407 int ret;
2408
2409 if (has_pack_index(sha1)) {
2410 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
2411 if (!new_pack)
2412 return -1; /* parse_pack_index() already issued error message */
2413 goto add_pack;
2414 }
2415
2416 tmp_idx = fetch_pack_index(sha1, base_url);
2417 if (!tmp_idx)
2418 return -1;
2419
2420 new_pack = parse_pack_index(sha1, tmp_idx);
2421 if (!new_pack) {
2422 unlink(tmp_idx);
2423 free(tmp_idx);
2424
2425 return -1; /* parse_pack_index() already issued error message */
2426 }
2427
2428 ret = verify_pack_index(new_pack);
2429 if (!ret) {
2430 close_pack_index(new_pack);
2431 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
2432 }
2433 free(tmp_idx);
2434 if (ret)
2435 return -1;
2436
2437 add_pack:
2438 new_pack->next = *packs_head;
2439 *packs_head = new_pack;
2440 return 0;
2441 }
2442
2443 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
2444 {
2445 struct http_get_options options = {0};
2446 int ret = 0;
2447 char *url;
2448 const char *data;
2449 struct strbuf buf = STRBUF_INIT;
2450 struct object_id oid;
2451
2452 end_url_with_slash(&buf, base_url);
2453 strbuf_addstr(&buf, "objects/info/packs");
2454 url = strbuf_detach(&buf, NULL);
2455
2456 options.no_cache = 1;
2457 ret = http_get_strbuf(url, &buf, &options);
2458 if (ret != HTTP_OK)
2459 goto cleanup;
2460
2461 data = buf.buf;
2462 while (*data) {
2463 if (skip_prefix(data, "P pack-", &data) &&
2464 !parse_oid_hex(data, &oid, &data) &&
2465 skip_prefix(data, ".pack", &data) &&
2466 (*data == '\n' || *data == '\0')) {
2467 fetch_and_setup_pack_index(packs_head, oid.hash, base_url);
2468 } else {
2469 data = strchrnul(data, '\n');
2470 }
2471 if (*data)
2472 data++; /* skip past newline */
2473 }
2474
2475 cleanup:
2476 free(url);
2477 return ret;
2478 }
2479
2480 void release_http_pack_request(struct http_pack_request *preq)
2481 {
2482 if (preq->packfile) {
2483 fclose(preq->packfile);
2484 preq->packfile = NULL;
2485 }
2486 preq->slot = NULL;
2487 strbuf_release(&preq->tmpfile);
2488 curl_slist_free_all(preq->headers);
2489 free(preq->url);
2490 free(preq);
2491 }
2492
2493 static const char *default_index_pack_args[] =
2494 {"index-pack", "--stdin", NULL};
2495
2496 int finish_http_pack_request(struct http_pack_request *preq)
2497 {
2498 struct child_process ip = CHILD_PROCESS_INIT;
2499 int tmpfile_fd;
2500 int ret = 0;
2501
2502 fclose(preq->packfile);
2503 preq->packfile = NULL;
2504
2505 tmpfile_fd = xopen(preq->tmpfile.buf, O_RDONLY);
2506
2507 ip.git_cmd = 1;
2508 ip.in = tmpfile_fd;
2509 strvec_pushv(&ip.args, preq->index_pack_args ?
2510 preq->index_pack_args :
2511 default_index_pack_args);
2512
2513 if (preq->preserve_index_pack_stdout)
2514 ip.out = 0;
2515 else
2516 ip.no_stdout = 1;
2517
2518 if (run_command(&ip)) {
2519 ret = -1;
2520 goto cleanup;
2521 }
2522
2523 cleanup:
2524 close(tmpfile_fd);
2525 unlink(preq->tmpfile.buf);
2526 return ret;
2527 }
2528
2529 void http_install_packfile(struct packed_git *p,
2530 struct packed_git **list_to_remove_from)
2531 {
2532 struct packed_git **lst = list_to_remove_from;
2533
2534 while (*lst != p)
2535 lst = &((*lst)->next);
2536 *lst = (*lst)->next;
2537
2538 install_packed_git(the_repository, p);
2539 }
2540
2541 struct http_pack_request *new_http_pack_request(
2542 const unsigned char *packed_git_hash, const char *base_url) {
2543
2544 struct strbuf buf = STRBUF_INIT;
2545
2546 end_url_with_slash(&buf, base_url);
2547 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2548 hash_to_hex(packed_git_hash));
2549 return new_direct_http_pack_request(packed_git_hash,
2550 strbuf_detach(&buf, NULL));
2551 }
2552
2553 struct http_pack_request *new_direct_http_pack_request(
2554 const unsigned char *packed_git_hash, char *url)
2555 {
2556 off_t prev_posn = 0;
2557 struct http_pack_request *preq;
2558
2559 CALLOC_ARRAY(preq, 1);
2560 strbuf_init(&preq->tmpfile, 0);
2561
2562 preq->url = url;
2563
2564 strbuf_addf(&preq->tmpfile, "%s.temp", sha1_pack_name(packed_git_hash));
2565 preq->packfile = fopen(preq->tmpfile.buf, "a");
2566 if (!preq->packfile) {
2567 error("Unable to open local file %s for pack",
2568 preq->tmpfile.buf);
2569 goto abort;
2570 }
2571
2572 preq->slot = get_active_slot();
2573 preq->headers = object_request_headers();
2574 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEDATA, preq->packfile);
2575 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2576 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2577 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER, preq->headers);
2578
2579 /*
2580 * If there is data present from a previous transfer attempt,
2581 * resume where it left off
2582 */
2583 prev_posn = ftello(preq->packfile);
2584 if (prev_posn>0) {
2585 if (http_is_verbose)
2586 fprintf(stderr,
2587 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2588 hash_to_hex(packed_git_hash),
2589 (uintmax_t)prev_posn);
2590 http_opt_request_remainder(preq->slot->curl, prev_posn);
2591 }
2592
2593 return preq;
2594
2595 abort:
2596 strbuf_release(&preq->tmpfile);
2597 free(preq->url);
2598 free(preq);
2599 return NULL;
2600 }
2601
2602 /* Helpers for fetching objects (loose) */
2603 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2604 void *data)
2605 {
2606 unsigned char expn[4096];
2607 size_t size = eltsize * nmemb;
2608 int posn = 0;
2609 struct http_object_request *freq = data;
2610 struct active_request_slot *slot = freq->slot;
2611
2612 if (slot) {
2613 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2614 &slot->http_code);
2615 if (c != CURLE_OK)
2616 BUG("curl_easy_getinfo for HTTP code failed: %s",
2617 curl_easy_strerror(c));
2618 if (slot->http_code >= 300)
2619 return nmemb;
2620 }
2621
2622 do {
2623 ssize_t retval = xwrite(freq->localfile,
2624 (char *) ptr + posn, size - posn);
2625 if (retval < 0)
2626 return posn / eltsize;
2627 posn += retval;
2628 } while (posn < size);
2629
2630 freq->stream.avail_in = size;
2631 freq->stream.next_in = (void *)ptr;
2632 do {
2633 freq->stream.next_out = expn;
2634 freq->stream.avail_out = sizeof(expn);
2635 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2636 the_hash_algo->update_fn(&freq->c, expn,
2637 sizeof(expn) - freq->stream.avail_out);
2638 } while (freq->stream.avail_in && freq->zret == Z_OK);
2639 return nmemb;
2640 }
2641
2642 struct http_object_request *new_http_object_request(const char *base_url,
2643 const struct object_id *oid)
2644 {
2645 char *hex = oid_to_hex(oid);
2646 struct strbuf filename = STRBUF_INIT;
2647 struct strbuf prevfile = STRBUF_INIT;
2648 int prevlocal;
2649 char prev_buf[PREV_BUF_SIZE];
2650 ssize_t prev_read = 0;
2651 off_t prev_posn = 0;
2652 struct http_object_request *freq;
2653
2654 CALLOC_ARRAY(freq, 1);
2655 strbuf_init(&freq->tmpfile, 0);
2656 oidcpy(&freq->oid, oid);
2657 freq->localfile = -1;
2658
2659 loose_object_path(the_repository, &filename, oid);
2660 strbuf_addf(&freq->tmpfile, "%s.temp", filename.buf);
2661
2662 strbuf_addf(&prevfile, "%s.prev", filename.buf);
2663 unlink_or_warn(prevfile.buf);
2664 rename(freq->tmpfile.buf, prevfile.buf);
2665 unlink_or_warn(freq->tmpfile.buf);
2666 strbuf_release(&filename);
2667
2668 if (freq->localfile != -1)
2669 error("fd leakage in start: %d", freq->localfile);
2670 freq->localfile = open(freq->tmpfile.buf,
2671 O_WRONLY | O_CREAT | O_EXCL, 0666);
2672 /*
2673 * This could have failed due to the "lazy directory creation";
2674 * try to mkdir the last path component.
2675 */
2676 if (freq->localfile < 0 && errno == ENOENT) {
2677 char *dir = strrchr(freq->tmpfile.buf, '/');
2678 if (dir) {
2679 *dir = 0;
2680 mkdir(freq->tmpfile.buf, 0777);
2681 *dir = '/';
2682 }
2683 freq->localfile = open(freq->tmpfile.buf,
2684 O_WRONLY | O_CREAT | O_EXCL, 0666);
2685 }
2686
2687 if (freq->localfile < 0) {
2688 error_errno("Couldn't create temporary file %s",
2689 freq->tmpfile.buf);
2690 goto abort;
2691 }
2692
2693 git_inflate_init(&freq->stream);
2694
2695 the_hash_algo->init_fn(&freq->c);
2696
2697 freq->url = get_remote_object_url(base_url, hex, 0);
2698
2699 /*
2700 * If a previous temp file is present, process what was already
2701 * fetched.
2702 */
2703 prevlocal = open(prevfile.buf, O_RDONLY);
2704 if (prevlocal != -1) {
2705 do {
2706 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2707 if (prev_read>0) {
2708 if (fwrite_sha1_file(prev_buf,
2709 1,
2710 prev_read,
2711 freq) == prev_read) {
2712 prev_posn += prev_read;
2713 } else {
2714 prev_read = -1;
2715 }
2716 }
2717 } while (prev_read > 0);
2718 close(prevlocal);
2719 }
2720 unlink_or_warn(prevfile.buf);
2721 strbuf_release(&prevfile);
2722
2723 /*
2724 * Reset inflate/SHA1 if there was an error reading the previous temp
2725 * file; also rewind to the beginning of the local file.
2726 */
2727 if (prev_read == -1) {
2728 memset(&freq->stream, 0, sizeof(freq->stream));
2729 git_inflate_init(&freq->stream);
2730 the_hash_algo->init_fn(&freq->c);
2731 if (prev_posn>0) {
2732 prev_posn = 0;
2733 lseek(freq->localfile, 0, SEEK_SET);
2734 if (ftruncate(freq->localfile, 0) < 0) {
2735 error_errno("Couldn't truncate temporary file %s",
2736 freq->tmpfile.buf);
2737 goto abort;
2738 }
2739 }
2740 }
2741
2742 freq->slot = get_active_slot();
2743 freq->headers = object_request_headers();
2744
2745 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEDATA, freq);
2746 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2747 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2748 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2749 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2750 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, freq->headers);
2751
2752 /*
2753 * If we have successfully processed data from a previous fetch
2754 * attempt, only fetch the data we don't already have.
2755 */
2756 if (prev_posn>0) {
2757 if (http_is_verbose)
2758 fprintf(stderr,
2759 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2760 hex, (uintmax_t)prev_posn);
2761 http_opt_request_remainder(freq->slot->curl, prev_posn);
2762 }
2763
2764 return freq;
2765
2766 abort:
2767 strbuf_release(&prevfile);
2768 free(freq->url);
2769 free(freq);
2770 return NULL;
2771 }
2772
2773 void process_http_object_request(struct http_object_request *freq)
2774 {
2775 if (!freq->slot)
2776 return;
2777 freq->curl_result = freq->slot->curl_result;
2778 freq->http_code = freq->slot->http_code;
2779 freq->slot = NULL;
2780 }
2781
2782 int finish_http_object_request(struct http_object_request *freq)
2783 {
2784 struct stat st;
2785 struct strbuf filename = STRBUF_INIT;
2786
2787 close(freq->localfile);
2788 freq->localfile = -1;
2789
2790 process_http_object_request(freq);
2791
2792 if (freq->http_code == 416) {
2793 warning("requested range invalid; we may already have all the data.");
2794 } else if (freq->curl_result != CURLE_OK) {
2795 if (stat(freq->tmpfile.buf, &st) == 0)
2796 if (st.st_size == 0)
2797 unlink_or_warn(freq->tmpfile.buf);
2798 return -1;
2799 }
2800
2801 git_inflate_end(&freq->stream);
2802 the_hash_algo->final_oid_fn(&freq->real_oid, &freq->c);
2803 if (freq->zret != Z_STREAM_END) {
2804 unlink_or_warn(freq->tmpfile.buf);
2805 return -1;
2806 }
2807 if (!oideq(&freq->oid, &freq->real_oid)) {
2808 unlink_or_warn(freq->tmpfile.buf);
2809 return -1;
2810 }
2811 loose_object_path(the_repository, &filename, &freq->oid);
2812 freq->rename = finalize_object_file(freq->tmpfile.buf, filename.buf);
2813 strbuf_release(&filename);
2814
2815 return freq->rename;
2816 }
2817
2818 void abort_http_object_request(struct http_object_request *freq)
2819 {
2820 unlink_or_warn(freq->tmpfile.buf);
2821
2822 release_http_object_request(freq);
2823 }
2824
2825 void release_http_object_request(struct http_object_request *freq)
2826 {
2827 if (freq->localfile != -1) {
2828 close(freq->localfile);
2829 freq->localfile = -1;
2830 }
2831 FREE_AND_NULL(freq->url);
2832 if (freq->slot) {
2833 freq->slot->callback_func = NULL;
2834 freq->slot->callback_data = NULL;
2835 release_active_slot(freq->slot);
2836 freq->slot = NULL;
2837 }
2838 curl_slist_free_all(freq->headers);
2839 strbuf_release(&freq->tmpfile);
2840 }
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