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Merge branch 'js/var-git-shell-path'
[git/debian.git] / http.c
blob623ed234891f44dbc9b767ada98a854320921c30
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 if (starts_with(curl_http_proxy, "socks5h"))
1231 curl_easy_setopt(result,
1232 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
1233 else if (starts_with(curl_http_proxy, "socks5"))
1234 curl_easy_setopt(result,
1235 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
1236 else if (starts_with(curl_http_proxy, "socks4a"))
1237 curl_easy_setopt(result,
1238 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
1239 else if (starts_with(curl_http_proxy, "socks"))
1240 curl_easy_setopt(result,
1241 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
1242 #ifdef GIT_CURL_HAVE_CURLOPT_PROXY_KEYPASSWD
1243 else if (starts_with(curl_http_proxy, "https")) {
1244 curl_easy_setopt(result, CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
1245
1246 if (http_proxy_ssl_cert)
1247 curl_easy_setopt(result, CURLOPT_PROXY_SSLCERT, http_proxy_ssl_cert);
1248
1249 if (http_proxy_ssl_key)
1250 curl_easy_setopt(result, CURLOPT_PROXY_SSLKEY, http_proxy_ssl_key);
1251
1252 if (has_proxy_cert_password())
1253 curl_easy_setopt(result, CURLOPT_PROXY_KEYPASSWD, proxy_cert_auth.password);
1254 }
1255 #endif
1256 if (strstr(curl_http_proxy, "://"))
1257 credential_from_url(&proxy_auth, curl_http_proxy);
1258 else {
1259 struct strbuf url = STRBUF_INIT;
1260 strbuf_addf(&url, "http://%s", curl_http_proxy);
1261 credential_from_url(&proxy_auth, url.buf);
1262 strbuf_release(&url);
1263 }
1264
1265 if (!proxy_auth.host)
1266 die("Invalid proxy URL '%s'", curl_http_proxy);
1267
1268 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
1269 var_override(&curl_no_proxy, getenv("NO_PROXY"));
1270 var_override(&curl_no_proxy, getenv("no_proxy"));
1271 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
1272 }
1273 init_curl_proxy_auth(result);
1274
1275 set_curl_keepalive(result);
1276
1277 return result;
1278 }
1279
1280 static void set_from_env(char **var, const char *envname)
1281 {
1282 const char *val = getenv(envname);
1283 if (val) {
1284 FREE_AND_NULL(*var);
1285 *var = xstrdup(val);
1286 }
1287 }
1288
1289 void http_init(struct remote *remote, const char *url, int proactive_auth)
1290 {
1291 char *low_speed_limit;
1292 char *low_speed_time;
1293 char *normalized_url;
1294 struct urlmatch_config config = URLMATCH_CONFIG_INIT;
1295
1296 config.section = "http";
1297 config.key = NULL;
1298 config.collect_fn = http_options;
1299 config.cascade_fn = git_default_config;
1300 config.cb = NULL;
1301
1302 http_is_verbose = 0;
1303 normalized_url = url_normalize(url, &config.url);
1304
1305 git_config(urlmatch_config_entry, &config);
1306 free(normalized_url);
1307 string_list_clear(&config.vars, 1);
1308
1309 #ifdef GIT_CURL_HAVE_CURLSSLSET_NO_BACKENDS
1310 if (http_ssl_backend) {
1311 const curl_ssl_backend **backends;
1312 struct strbuf buf = STRBUF_INIT;
1313 int i;
1314
1315 switch (curl_global_sslset(-1, http_ssl_backend, &backends)) {
1316 case CURLSSLSET_UNKNOWN_BACKEND:
1317 strbuf_addf(&buf, _("Unsupported SSL backend '%s'. "
1318 "Supported SSL backends:"),
1319 http_ssl_backend);
1320 for (i = 0; backends[i]; i++)
1321 strbuf_addf(&buf, "\n\t%s", backends[i]->name);
1322 die("%s", buf.buf);
1323 case CURLSSLSET_NO_BACKENDS:
1324 die(_("Could not set SSL backend to '%s': "
1325 "cURL was built without SSL backends"),
1326 http_ssl_backend);
1327 case CURLSSLSET_TOO_LATE:
1328 die(_("Could not set SSL backend to '%s': already set"),
1329 http_ssl_backend);
1330 case CURLSSLSET_OK:
1331 break; /* Okay! */
1332 }
1333 }
1334 #endif
1335
1336 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1337 die("curl_global_init failed");
1338
1339 if (proactive_auth && http_proactive_auth == PROACTIVE_AUTH_NONE)
1340 http_proactive_auth = PROACTIVE_AUTH_IF_CREDENTIALS;
1341
1342 if (remote && remote->http_proxy)
1343 curl_http_proxy = xstrdup(remote->http_proxy);
1344
1345 if (remote)
1346 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
1347
1348 pragma_header = curl_slist_append(http_copy_default_headers(),
1349 "Pragma: no-cache");
1350
1351 {
1352 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1353 if (http_max_requests)
1354 max_requests = atoi(http_max_requests);
1355 }
1356
1357 curlm = curl_multi_init();
1358 if (!curlm)
1359 die("curl_multi_init failed");
1360
1361 if (getenv("GIT_SSL_NO_VERIFY"))
1362 curl_ssl_verify = 0;
1363
1364 set_from_env(&ssl_cert, "GIT_SSL_CERT");
1365 set_from_env(&ssl_cert_type, "GIT_SSL_CERT_TYPE");
1366 set_from_env(&ssl_key, "GIT_SSL_KEY");
1367 set_from_env(&ssl_key_type, "GIT_SSL_KEY_TYPE");
1368 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
1369 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
1370
1371 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
1372
1373 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1374 if (low_speed_limit)
1375 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1376 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1377 if (low_speed_time)
1378 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1379
1380 if (curl_ssl_verify == -1)
1381 curl_ssl_verify = 1;
1382
1383 curl_session_count = 0;
1384 if (max_requests < 1)
1385 max_requests = DEFAULT_MAX_REQUESTS;
1386
1387 set_from_env(&http_proxy_ssl_cert, "GIT_PROXY_SSL_CERT");
1388 set_from_env(&http_proxy_ssl_key, "GIT_PROXY_SSL_KEY");
1389 set_from_env(&http_proxy_ssl_ca_info, "GIT_PROXY_SSL_CAINFO");
1390
1391 if (getenv("GIT_PROXY_SSL_CERT_PASSWORD_PROTECTED"))
1392 proxy_ssl_cert_password_required = 1;
1393
1394 if (getenv("GIT_CURL_FTP_NO_EPSV"))
1395 curl_ftp_no_epsv = 1;
1396
1397 if (url) {
1398 credential_from_url(&http_auth, url);
1399 if (!ssl_cert_password_required &&
1400 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1401 starts_with(url, "https://"))
1402 ssl_cert_password_required = 1;
1403 }
1404
1405 curl_default = get_curl_handle();
1406 }
1407
1408 void http_cleanup(void)
1409 {
1410 struct active_request_slot *slot = active_queue_head;
1411
1412 while (slot != NULL) {
1413 struct active_request_slot *next = slot->next;
1414 if (slot->curl) {
1415 xmulti_remove_handle(slot);
1416 curl_easy_cleanup(slot->curl);
1417 }
1418 free(slot);
1419 slot = next;
1420 }
1421 active_queue_head = NULL;
1422
1423 curl_easy_cleanup(curl_default);
1424
1425 curl_multi_cleanup(curlm);
1426 curl_global_cleanup();
1427
1428 string_list_clear(&extra_http_headers, 0);
1429
1430 curl_slist_free_all(pragma_header);
1431 pragma_header = NULL;
1432
1433 curl_slist_free_all(host_resolutions);
1434 host_resolutions = NULL;
1435
1436 if (curl_http_proxy) {
1437 free((void *)curl_http_proxy);
1438 curl_http_proxy = NULL;
1439 }
1440
1441 if (proxy_auth.password) {
1442 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1443 FREE_AND_NULL(proxy_auth.password);
1444 }
1445
1446 free((void *)curl_proxyuserpwd);
1447 curl_proxyuserpwd = NULL;
1448
1449 free((void *)http_proxy_authmethod);
1450 http_proxy_authmethod = NULL;
1451
1452 if (cert_auth.password) {
1453 memset(cert_auth.password, 0, strlen(cert_auth.password));
1454 FREE_AND_NULL(cert_auth.password);
1455 }
1456 ssl_cert_password_required = 0;
1457
1458 if (proxy_cert_auth.password) {
1459 memset(proxy_cert_auth.password, 0, strlen(proxy_cert_auth.password));
1460 FREE_AND_NULL(proxy_cert_auth.password);
1461 }
1462 proxy_ssl_cert_password_required = 0;
1463
1464 FREE_AND_NULL(cached_accept_language);
1465 }
1466
1467 struct active_request_slot *get_active_slot(void)
1468 {
1469 struct active_request_slot *slot = active_queue_head;
1470 struct active_request_slot *newslot;
1471
1472 int num_transfers;
1473
1474 /* Wait for a slot to open up if the queue is full */
1475 while (active_requests >= max_requests) {
1476 curl_multi_perform(curlm, &num_transfers);
1477 if (num_transfers < active_requests)
1478 process_curl_messages();
1479 }
1480
1481 while (slot != NULL && slot->in_use)
1482 slot = slot->next;
1483
1484 if (!slot) {
1485 newslot = xmalloc(sizeof(*newslot));
1486 newslot->curl = NULL;
1487 newslot->in_use = 0;
1488 newslot->next = NULL;
1489
1490 slot = active_queue_head;
1491 if (!slot) {
1492 active_queue_head = newslot;
1493 } else {
1494 while (slot->next != NULL)
1495 slot = slot->next;
1496 slot->next = newslot;
1497 }
1498 slot = newslot;
1499 }
1500
1501 if (!slot->curl) {
1502 slot->curl = curl_easy_duphandle(curl_default);
1503 curl_session_count++;
1504 }
1505
1506 active_requests++;
1507 slot->in_use = 1;
1508 slot->results = NULL;
1509 slot->finished = NULL;
1510 slot->callback_data = NULL;
1511 slot->callback_func = NULL;
1512
1513 if (curl_cookie_file && !strcmp(curl_cookie_file, "-")) {
1514 warning(_("refusing to read cookies from http.cookiefile '-'"));
1515 FREE_AND_NULL(curl_cookie_file);
1516 }
1517 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1518 if (curl_save_cookies && (!curl_cookie_file || !curl_cookie_file[0])) {
1519 curl_save_cookies = 0;
1520 warning(_("ignoring http.savecookies for empty http.cookiefile"));
1521 }
1522 if (curl_save_cookies)
1523 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1524 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1525 curl_easy_setopt(slot->curl, CURLOPT_RESOLVE, host_resolutions);
1526 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1527 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1528 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1529 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1530 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1531 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, -1L);
1532 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1533 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1534 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1535 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1536
1537 /*
1538 * Default following to off unless "ALWAYS" is configured; this gives
1539 * callers a sane starting point, and they can tweak for individual
1540 * HTTP_FOLLOW_* cases themselves.
1541 */
1542 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1543 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1544 else
1545 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1546
1547 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1548 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1549 if (http_auth.password || http_auth.credential || curl_empty_auth_enabled())
1550 init_curl_http_auth(slot->curl);
1551
1552 return slot;
1553 }
1554
1555 int start_active_slot(struct active_request_slot *slot)
1556 {
1557 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1558 int num_transfers;
1559
1560 if (curlm_result != CURLM_OK &&
1561 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1562 warning("curl_multi_add_handle failed: %s",
1563 curl_multi_strerror(curlm_result));
1564 active_requests--;
1565 slot->in_use = 0;
1566 return 0;
1567 }
1568
1569 /*
1570 * We know there must be something to do, since we just added
1571 * something.
1572 */
1573 curl_multi_perform(curlm, &num_transfers);
1574 return 1;
1575 }
1576
1577 struct fill_chain {
1578 void *data;
1579 int (*fill)(void *);
1580 struct fill_chain *next;
1581 };
1582
1583 static struct fill_chain *fill_cfg;
1584
1585 void add_fill_function(void *data, int (*fill)(void *))
1586 {
1587 struct fill_chain *new_fill = xmalloc(sizeof(*new_fill));
1588 struct fill_chain **linkp = &fill_cfg;
1589 new_fill->data = data;
1590 new_fill->fill = fill;
1591 new_fill->next = NULL;
1592 while (*linkp)
1593 linkp = &(*linkp)->next;
1594 *linkp = new_fill;
1595 }
1596
1597 void fill_active_slots(void)
1598 {
1599 struct active_request_slot *slot = active_queue_head;
1600
1601 while (active_requests < max_requests) {
1602 struct fill_chain *fill;
1603 for (fill = fill_cfg; fill; fill = fill->next)
1604 if (fill->fill(fill->data))
1605 break;
1606
1607 if (!fill)
1608 break;
1609 }
1610
1611 while (slot != NULL) {
1612 if (!slot->in_use && slot->curl != NULL
1613 && curl_session_count > min_curl_sessions) {
1614 curl_easy_cleanup(slot->curl);
1615 slot->curl = NULL;
1616 curl_session_count--;
1617 }
1618 slot = slot->next;
1619 }
1620 }
1621
1622 void step_active_slots(void)
1623 {
1624 int num_transfers;
1625 CURLMcode curlm_result;
1626
1627 do {
1628 curlm_result = curl_multi_perform(curlm, &num_transfers);
1629 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1630 if (num_transfers < active_requests) {
1631 process_curl_messages();
1632 fill_active_slots();
1633 }
1634 }
1635
1636 void run_active_slot(struct active_request_slot *slot)
1637 {
1638 fd_set readfds;
1639 fd_set writefds;
1640 fd_set excfds;
1641 int max_fd;
1642 struct timeval select_timeout;
1643 int finished = 0;
1644
1645 slot->finished = &finished;
1646 while (!finished) {
1647 step_active_slots();
1648
1649 if (slot->in_use) {
1650 long curl_timeout;
1651 curl_multi_timeout(curlm, &curl_timeout);
1652 if (curl_timeout == 0) {
1653 continue;
1654 } else if (curl_timeout == -1) {
1655 select_timeout.tv_sec = 0;
1656 select_timeout.tv_usec = 50000;
1657 } else {
1658 select_timeout.tv_sec = curl_timeout / 1000;
1659 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1660 }
1661
1662 max_fd = -1;
1663 FD_ZERO(&readfds);
1664 FD_ZERO(&writefds);
1665 FD_ZERO(&excfds);
1666 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1667
1668 /*
1669 * It can happen that curl_multi_timeout returns a pathologically
1670 * long timeout when curl_multi_fdset returns no file descriptors
1671 * to read. See commit message for more details.
1672 */
1673 if (max_fd < 0 &&
1674 (select_timeout.tv_sec > 0 ||
1675 select_timeout.tv_usec > 50000)) {
1676 select_timeout.tv_sec = 0;
1677 select_timeout.tv_usec = 50000;
1678 }
1679
1680 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1681 }
1682 }
1683
1684 /*
1685 * The value of slot->finished we set before the loop was used
1686 * to set our "finished" variable when our request completed.
1687 *
1688 * 1. The slot may not have been reused for another requst
1689 * yet, in which case it still has &finished.
1690 *
1691 * 2. The slot may already be in-use to serve another request,
1692 * which can further be divided into two cases:
1693 *
1694 * (a) If call run_active_slot() hasn't been called for that
1695 * other request, slot->finished would have been cleared
1696 * by get_active_slot() and has NULL.
1697 *
1698 * (b) If the request did call run_active_slot(), then the
1699 * call would have updated slot->finished at the beginning
1700 * of this function, and with the clearing of the member
1701 * below, we would find that slot->finished is now NULL.
1702 *
1703 * In all cases, slot->finished has no useful information to
1704 * anybody at this point. Some compilers warn us for
1705 * attempting to smuggle a pointer that is about to become
1706 * invalid, i.e. &finished. We clear it here to assure them.
1707 */
1708 slot->finished = NULL;
1709 }
1710
1711 static void release_active_slot(struct active_request_slot *slot)
1712 {
1713 closedown_active_slot(slot);
1714 if (slot->curl) {
1715 xmulti_remove_handle(slot);
1716 if (curl_session_count > min_curl_sessions) {
1717 curl_easy_cleanup(slot->curl);
1718 slot->curl = NULL;
1719 curl_session_count--;
1720 }
1721 }
1722 fill_active_slots();
1723 }
1724
1725 void finish_all_active_slots(void)
1726 {
1727 struct active_request_slot *slot = active_queue_head;
1728
1729 while (slot != NULL)
1730 if (slot->in_use) {
1731 run_active_slot(slot);
1732 slot = active_queue_head;
1733 } else {
1734 slot = slot->next;
1735 }
1736 }
1737
1738 /* Helpers for modifying and creating URLs */
1739 static inline int needs_quote(int ch)
1740 {
1741 if (((ch >= 'A') && (ch <= 'Z'))
1742 || ((ch >= 'a') && (ch <= 'z'))
1743 || ((ch >= '0') && (ch <= '9'))
1744 || (ch == '/')
1745 || (ch == '-')
1746 || (ch == '.'))
1747 return 0;
1748 return 1;
1749 }
1750
1751 static char *quote_ref_url(const char *base, const char *ref)
1752 {
1753 struct strbuf buf = STRBUF_INIT;
1754 const char *cp;
1755 int ch;
1756
1757 end_url_with_slash(&buf, base);
1758
1759 for (cp = ref; (ch = *cp) != 0; cp++)
1760 if (needs_quote(ch))
1761 strbuf_addf(&buf, "%%%02x", ch);
1762 else
1763 strbuf_addch(&buf, *cp);
1764
1765 return strbuf_detach(&buf, NULL);
1766 }
1767
1768 void append_remote_object_url(struct strbuf *buf, const char *url,
1769 const char *hex,
1770 int only_two_digit_prefix)
1771 {
1772 end_url_with_slash(buf, url);
1773
1774 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1775 if (!only_two_digit_prefix)
1776 strbuf_addstr(buf, hex + 2);
1777 }
1778
1779 char *get_remote_object_url(const char *url, const char *hex,
1780 int only_two_digit_prefix)
1781 {
1782 struct strbuf buf = STRBUF_INIT;
1783 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1784 return strbuf_detach(&buf, NULL);
1785 }
1786
1787 void normalize_curl_result(CURLcode *result, long http_code,
1788 char *errorstr, size_t errorlen)
1789 {
1790 /*
1791 * If we see a failing http code with CURLE_OK, we have turned off
1792 * FAILONERROR (to keep the server's custom error response), and should
1793 * translate the code into failure here.
1794 *
1795 * Likewise, if we see a redirect (30x code), that means we turned off
1796 * redirect-following, and we should treat the result as an error.
1797 */
1798 if (*result == CURLE_OK && http_code >= 300) {
1799 *result = CURLE_HTTP_RETURNED_ERROR;
1800 /*
1801 * Normally curl will already have put the "reason phrase"
1802 * from the server into curl_errorstr; unfortunately without
1803 * FAILONERROR it is lost, so we can give only the numeric
1804 * status code.
1805 */
1806 xsnprintf(errorstr, errorlen,
1807 "The requested URL returned error: %ld",
1808 http_code);
1809 }
1810 }
1811
1812 static int handle_curl_result(struct slot_results *results)
1813 {
1814 normalize_curl_result(&results->curl_result, results->http_code,
1815 curl_errorstr, sizeof(curl_errorstr));
1816
1817 if (results->curl_result == CURLE_OK) {
1818 credential_approve(&http_auth);
1819 credential_approve(&proxy_auth);
1820 credential_approve(&cert_auth);
1821 return HTTP_OK;
1822 } else if (results->curl_result == CURLE_SSL_CERTPROBLEM) {
1823 /*
1824 * We can't tell from here whether it's a bad path, bad
1825 * certificate, bad password, or something else wrong
1826 * with the certificate. So we reject the credential to
1827 * avoid caching or saving a bad password.
1828 */
1829 credential_reject(&cert_auth);
1830 return HTTP_NOAUTH;
1831 #ifdef GIT_CURL_HAVE_CURLE_SSL_PINNEDPUBKEYNOTMATCH
1832 } else if (results->curl_result == CURLE_SSL_PINNEDPUBKEYNOTMATCH) {
1833 return HTTP_NOMATCHPUBLICKEY;
1834 #endif
1835 } else if (missing_target(results))
1836 return HTTP_MISSING_TARGET;
1837 else if (results->http_code == 401) {
1838 if ((http_auth.username && http_auth.password) ||\
1839 (http_auth.authtype && http_auth.credential)) {
1840 if (http_auth.multistage) {
1841 credential_clear_secrets(&http_auth);
1842 return HTTP_REAUTH;
1843 }
1844 credential_reject(&http_auth);
1845 if (always_auth_proactively())
1846 http_proactive_auth = PROACTIVE_AUTH_NONE;
1847 return HTTP_NOAUTH;
1848 } else {
1849 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1850 if (results->auth_avail) {
1851 http_auth_methods &= results->auth_avail;
1852 http_auth_methods_restricted = 1;
1853 }
1854 return HTTP_REAUTH;
1855 }
1856 } else {
1857 if (results->http_connectcode == 407)
1858 credential_reject(&proxy_auth);
1859 if (!curl_errorstr[0])
1860 strlcpy(curl_errorstr,
1861 curl_easy_strerror(results->curl_result),
1862 sizeof(curl_errorstr));
1863 return HTTP_ERROR;
1864 }
1865 }
1866
1867 int run_one_slot(struct active_request_slot *slot,
1868 struct slot_results *results)
1869 {
1870 slot->results = results;
1871 if (!start_active_slot(slot)) {
1872 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1873 "failed to start HTTP request");
1874 return HTTP_START_FAILED;
1875 }
1876
1877 run_active_slot(slot);
1878 return handle_curl_result(results);
1879 }
1880
1881 struct curl_slist *http_copy_default_headers(void)
1882 {
1883 struct curl_slist *headers = NULL;
1884 const struct string_list_item *item;
1885
1886 for_each_string_list_item(item, &extra_http_headers)
1887 headers = curl_slist_append(headers, item->string);
1888
1889 return headers;
1890 }
1891
1892 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1893 {
1894 char *ptr;
1895 CURLcode ret;
1896
1897 strbuf_reset(buf);
1898 ret = curl_easy_getinfo(curl, info, &ptr);
1899 if (!ret && ptr)
1900 strbuf_addstr(buf, ptr);
1901 return ret;
1902 }
1903
1904 /*
1905 * Check for and extract a content-type parameter. "raw"
1906 * should be positioned at the start of the potential
1907 * parameter, with any whitespace already removed.
1908 *
1909 * "name" is the name of the parameter. The value is appended
1910 * to "out".
1911 */
1912 static int extract_param(const char *raw, const char *name,
1913 struct strbuf *out)
1914 {
1915 size_t len = strlen(name);
1916
1917 if (strncasecmp(raw, name, len))
1918 return -1;
1919 raw += len;
1920
1921 if (*raw != '=')
1922 return -1;
1923 raw++;
1924
1925 while (*raw && !isspace(*raw) && *raw != ';')
1926 strbuf_addch(out, *raw++);
1927 return 0;
1928 }
1929
1930 /*
1931 * Extract a normalized version of the content type, with any
1932 * spaces suppressed, all letters lowercased, and no trailing ";"
1933 * or parameters.
1934 *
1935 * Note that we will silently remove even invalid whitespace. For
1936 * example, "text / plain" is specifically forbidden by RFC 2616,
1937 * but "text/plain" is the only reasonable output, and this keeps
1938 * our code simple.
1939 *
1940 * If the "charset" argument is not NULL, store the value of any
1941 * charset parameter there.
1942 *
1943 * Example:
1944 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1945 * "text / plain" -> "text/plain"
1946 */
1947 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1948 struct strbuf *charset)
1949 {
1950 const char *p;
1951
1952 strbuf_reset(type);
1953 strbuf_grow(type, raw->len);
1954 for (p = raw->buf; *p; p++) {
1955 if (isspace(*p))
1956 continue;
1957 if (*p == ';') {
1958 p++;
1959 break;
1960 }
1961 strbuf_addch(type, tolower(*p));
1962 }
1963
1964 if (!charset)
1965 return;
1966
1967 strbuf_reset(charset);
1968 while (*p) {
1969 while (isspace(*p) || *p == ';')
1970 p++;
1971 if (!extract_param(p, "charset", charset))
1972 return;
1973 while (*p && !isspace(*p))
1974 p++;
1975 }
1976
1977 if (!charset->len && starts_with(type->buf, "text/"))
1978 strbuf_addstr(charset, "ISO-8859-1");
1979 }
1980
1981 static void write_accept_language(struct strbuf *buf)
1982 {
1983 /*
1984 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1985 * that, q-value will be smaller than 0.001, the minimum q-value the
1986 * HTTP specification allows. See
1987 * https://datatracker.ietf.org/doc/html/rfc7231#section-5.3.1 for q-value.
1988 */
1989 const int MAX_DECIMAL_PLACES = 3;
1990 const int MAX_LANGUAGE_TAGS = 1000;
1991 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1992 char **language_tags = NULL;
1993 int num_langs = 0;
1994 const char *s = get_preferred_languages();
1995 int i;
1996 struct strbuf tag = STRBUF_INIT;
1997
1998 /* Don't add Accept-Language header if no language is preferred. */
1999 if (!s)
2000 return;
2001
2002 /*
2003 * Split the colon-separated string of preferred languages into
2004 * language_tags array.
2005 */
2006 do {
2007 /* collect language tag */
2008 for (; *s && (isalnum(*s) || *s == '_'); s++)
2009 strbuf_addch(&tag, *s == '_' ? '-' : *s);
2010
2011 /* skip .codeset, @modifier and any other unnecessary parts */
2012 while (*s && *s != ':')
2013 s++;
2014
2015 if (tag.len) {
2016 num_langs++;
2017 REALLOC_ARRAY(language_tags, num_langs);
2018 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
2019 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
2020 break;
2021 }
2022 } while (*s++);
2023
2024 /* write Accept-Language header into buf */
2025 if (num_langs) {
2026 int last_buf_len = 0;
2027 int max_q;
2028 int decimal_places;
2029 char q_format[32];
2030
2031 /* add '*' */
2032 REALLOC_ARRAY(language_tags, num_langs + 1);
2033 language_tags[num_langs++] = xstrdup("*");
2034
2035 /* compute decimal_places */
2036 for (max_q = 1, decimal_places = 0;
2037 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
2038 decimal_places++, max_q *= 10)
2039 ;
2040
2041 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
2042
2043 strbuf_addstr(buf, "Accept-Language: ");
2044
2045 for (i = 0; i < num_langs; i++) {
2046 if (i > 0)
2047 strbuf_addstr(buf, ", ");
2048
2049 strbuf_addstr(buf, language_tags[i]);
2050
2051 if (i > 0)
2052 strbuf_addf(buf, q_format, max_q - i);
2053
2054 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
2055 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
2056 break;
2057 }
2058
2059 last_buf_len = buf->len;
2060 }
2061 }
2062
2063 for (i = 0; i < num_langs; i++)
2064 free(language_tags[i]);
2065 free(language_tags);
2066 }
2067
2068 /*
2069 * Get an Accept-Language header which indicates user's preferred languages.
2070 *
2071 * Examples:
2072 * LANGUAGE= -> ""
2073 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
2074 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
2075 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
2076 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
2077 * LANGUAGE= LANG=C -> ""
2078 */
2079 const char *http_get_accept_language_header(void)
2080 {
2081 if (!cached_accept_language) {
2082 struct strbuf buf = STRBUF_INIT;
2083 write_accept_language(&buf);
2084 if (buf.len > 0)
2085 cached_accept_language = strbuf_detach(&buf, NULL);
2086 }
2087
2088 return cached_accept_language;
2089 }
2090
2091 static void http_opt_request_remainder(CURL *curl, off_t pos)
2092 {
2093 char buf[128];
2094 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
2095 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
2096 }
2097
2098 /* http_request() targets */
2099 #define HTTP_REQUEST_STRBUF 0
2100 #define HTTP_REQUEST_FILE 1
2101
2102 static int http_request(const char *url,
2103 void *result, int target,
2104 const struct http_get_options *options)
2105 {
2106 struct active_request_slot *slot;
2107 struct slot_results results;
2108 struct curl_slist *headers = http_copy_default_headers();
2109 struct strbuf buf = STRBUF_INIT;
2110 const char *accept_language;
2111 int ret;
2112
2113 slot = get_active_slot();
2114 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
2115
2116 if (!result) {
2117 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
2118 } else {
2119 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
2120 curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, result);
2121
2122 if (target == HTTP_REQUEST_FILE) {
2123 off_t posn = ftello(result);
2124 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
2125 fwrite);
2126 if (posn > 0)
2127 http_opt_request_remainder(slot->curl, posn);
2128 } else
2129 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
2130 fwrite_buffer);
2131 }
2132
2133 curl_easy_setopt(slot->curl, CURLOPT_HEADERFUNCTION, fwrite_wwwauth);
2134
2135 accept_language = http_get_accept_language_header();
2136
2137 if (accept_language)
2138 headers = curl_slist_append(headers, accept_language);
2139
2140 strbuf_addstr(&buf, "Pragma:");
2141 if (options && options->no_cache)
2142 strbuf_addstr(&buf, " no-cache");
2143 if (options && options->initial_request &&
2144 http_follow_config == HTTP_FOLLOW_INITIAL)
2145 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
2146
2147 headers = curl_slist_append(headers, buf.buf);
2148
2149 /* Add additional headers here */
2150 if (options && options->extra_headers) {
2151 const struct string_list_item *item;
2152 if (options && options->extra_headers) {
2153 for_each_string_list_item(item, options->extra_headers) {
2154 headers = curl_slist_append(headers, item->string);
2155 }
2156 }
2157 }
2158
2159 headers = http_append_auth_header(&http_auth, headers);
2160
2161 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2162 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
2163 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
2164 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
2165
2166 ret = run_one_slot(slot, &results);
2167
2168 if (options && options->content_type) {
2169 struct strbuf raw = STRBUF_INIT;
2170 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
2171 extract_content_type(&raw, options->content_type,
2172 options->charset);
2173 strbuf_release(&raw);
2174 }
2175
2176 if (options && options->effective_url)
2177 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
2178 options->effective_url);
2179
2180 curl_slist_free_all(headers);
2181 strbuf_release(&buf);
2182
2183 return ret;
2184 }
2185
2186 /*
2187 * Update the "base" url to a more appropriate value, as deduced by
2188 * redirects seen when requesting a URL starting with "url".
2189 *
2190 * The "asked" parameter is a URL that we asked curl to access, and must begin
2191 * with "base".
2192 *
2193 * The "got" parameter is the URL that curl reported to us as where we ended
2194 * up.
2195 *
2196 * Returns 1 if we updated the base url, 0 otherwise.
2197 *
2198 * Our basic strategy is to compare "base" and "asked" to find the bits
2199 * specific to our request. We then strip those bits off of "got" to yield the
2200 * new base. So for example, if our base is "http://example.com/foo.git",
2201 * and we ask for "http://example.com/foo.git/info/refs", we might end up
2202 * with "https://other.example.com/foo.git/info/refs". We would want the
2203 * new URL to become "https://other.example.com/foo.git".
2204 *
2205 * Note that this assumes a sane redirect scheme. It's entirely possible
2206 * in the example above to end up at a URL that does not even end in
2207 * "info/refs". In such a case we die. There's not much we can do, such a
2208 * scheme is unlikely to represent a real git repository, and failing to
2209 * rewrite the base opens options for malicious redirects to do funny things.
2210 */
2211 static int update_url_from_redirect(struct strbuf *base,
2212 const char *asked,
2213 const struct strbuf *got)
2214 {
2215 const char *tail;
2216 size_t new_len;
2217
2218 if (!strcmp(asked, got->buf))
2219 return 0;
2220
2221 if (!skip_prefix(asked, base->buf, &tail))
2222 BUG("update_url_from_redirect: %s is not a superset of %s",
2223 asked, base->buf);
2224
2225 new_len = got->len;
2226 if (!strip_suffix_mem(got->buf, &new_len, tail))
2227 die(_("unable to update url base from redirection:\n"
2228 " asked for: %s\n"
2229 " redirect: %s"),
2230 asked, got->buf);
2231
2232 strbuf_reset(base);
2233 strbuf_add(base, got->buf, new_len);
2234
2235 return 1;
2236 }
2237
2238 static int http_request_reauth(const char *url,
2239 void *result, int target,
2240 struct http_get_options *options)
2241 {
2242 int i = 3;
2243 int ret;
2244
2245 if (always_auth_proactively())
2246 credential_fill(&http_auth, 1);
2247
2248 ret = http_request(url, result, target, options);
2249
2250 if (ret != HTTP_OK && ret != HTTP_REAUTH)
2251 return ret;
2252
2253 if (options && options->effective_url && options->base_url) {
2254 if (update_url_from_redirect(options->base_url,
2255 url, options->effective_url)) {
2256 credential_from_url(&http_auth, options->base_url->buf);
2257 url = options->effective_url->buf;
2258 }
2259 }
2260
2261 while (ret == HTTP_REAUTH && --i) {
2262 /*
2263 * The previous request may have put cruft into our output stream; we
2264 * should clear it out before making our next request.
2265 */
2266 switch (target) {
2267 case HTTP_REQUEST_STRBUF:
2268 strbuf_reset(result);
2269 break;
2270 case HTTP_REQUEST_FILE:
2271 if (fflush(result)) {
2272 error_errno("unable to flush a file");
2273 return HTTP_START_FAILED;
2274 }
2275 rewind(result);
2276 if (ftruncate(fileno(result), 0) < 0) {
2277 error_errno("unable to truncate a file");
2278 return HTTP_START_FAILED;
2279 }
2280 break;
2281 default:
2282 BUG("Unknown http_request target");
2283 }
2284
2285 credential_fill(&http_auth, 1);
2286
2287 ret = http_request(url, result, target, options);
2288 }
2289 return ret;
2290 }
2291
2292 int http_get_strbuf(const char *url,
2293 struct strbuf *result,
2294 struct http_get_options *options)
2295 {
2296 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
2297 }
2298
2299 /*
2300 * Downloads a URL and stores the result in the given file.
2301 *
2302 * If a previous interrupted download is detected (i.e. a previous temporary
2303 * file is still around) the download is resumed.
2304 */
2305 int http_get_file(const char *url, const char *filename,
2306 struct http_get_options *options)
2307 {
2308 int ret;
2309 struct strbuf tmpfile = STRBUF_INIT;
2310 FILE *result;
2311
2312 strbuf_addf(&tmpfile, "%s.temp", filename);
2313 result = fopen(tmpfile.buf, "a");
2314 if (!result) {
2315 error("Unable to open local file %s", tmpfile.buf);
2316 ret = HTTP_ERROR;
2317 goto cleanup;
2318 }
2319
2320 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
2321 fclose(result);
2322
2323 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
2324 ret = HTTP_ERROR;
2325 cleanup:
2326 strbuf_release(&tmpfile);
2327 return ret;
2328 }
2329
2330 int http_fetch_ref(const char *base, struct ref *ref)
2331 {
2332 struct http_get_options options = {0};
2333 char *url;
2334 struct strbuf buffer = STRBUF_INIT;
2335 int ret = -1;
2336
2337 options.no_cache = 1;
2338
2339 url = quote_ref_url(base, ref->name);
2340 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
2341 strbuf_rtrim(&buffer);
2342 if (buffer.len == the_hash_algo->hexsz)
2343 ret = get_oid_hex(buffer.buf, &ref->old_oid);
2344 else if (starts_with(buffer.buf, "ref: ")) {
2345 ref->symref = xstrdup(buffer.buf + 5);
2346 ret = 0;
2347 }
2348 }
2349
2350 strbuf_release(&buffer);
2351 free(url);
2352 return ret;
2353 }
2354
2355 /* Helpers for fetching packs */
2356 static char *fetch_pack_index(unsigned char *hash, const char *base_url)
2357 {
2358 char *url, *tmp;
2359 struct strbuf buf = STRBUF_INIT;
2360
2361 if (http_is_verbose)
2362 fprintf(stderr, "Getting index for pack %s\n", hash_to_hex(hash));
2363
2364 end_url_with_slash(&buf, base_url);
2365 strbuf_addf(&buf, "objects/pack/pack-%s.idx", hash_to_hex(hash));
2366 url = strbuf_detach(&buf, NULL);
2367
2368 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(hash));
2369 tmp = strbuf_detach(&buf, NULL);
2370
2371 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
2372 error("Unable to get pack index %s", url);
2373 FREE_AND_NULL(tmp);
2374 }
2375
2376 free(url);
2377 return tmp;
2378 }
2379
2380 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
2381 unsigned char *sha1, const char *base_url)
2382 {
2383 struct packed_git *new_pack;
2384 char *tmp_idx = NULL;
2385 int ret;
2386
2387 if (has_pack_index(sha1)) {
2388 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
2389 if (!new_pack)
2390 return -1; /* parse_pack_index() already issued error message */
2391 goto add_pack;
2392 }
2393
2394 tmp_idx = fetch_pack_index(sha1, base_url);
2395 if (!tmp_idx)
2396 return -1;
2397
2398 new_pack = parse_pack_index(sha1, tmp_idx);
2399 if (!new_pack) {
2400 unlink(tmp_idx);
2401 free(tmp_idx);
2402
2403 return -1; /* parse_pack_index() already issued error message */
2404 }
2405
2406 ret = verify_pack_index(new_pack);
2407 if (!ret) {
2408 close_pack_index(new_pack);
2409 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
2410 }
2411 free(tmp_idx);
2412 if (ret)
2413 return -1;
2414
2415 add_pack:
2416 new_pack->next = *packs_head;
2417 *packs_head = new_pack;
2418 return 0;
2419 }
2420
2421 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
2422 {
2423 struct http_get_options options = {0};
2424 int ret = 0;
2425 char *url;
2426 const char *data;
2427 struct strbuf buf = STRBUF_INIT;
2428 struct object_id oid;
2429
2430 end_url_with_slash(&buf, base_url);
2431 strbuf_addstr(&buf, "objects/info/packs");
2432 url = strbuf_detach(&buf, NULL);
2433
2434 options.no_cache = 1;
2435 ret = http_get_strbuf(url, &buf, &options);
2436 if (ret != HTTP_OK)
2437 goto cleanup;
2438
2439 data = buf.buf;
2440 while (*data) {
2441 if (skip_prefix(data, "P pack-", &data) &&
2442 !parse_oid_hex(data, &oid, &data) &&
2443 skip_prefix(data, ".pack", &data) &&
2444 (*data == '\n' || *data == '\0')) {
2445 fetch_and_setup_pack_index(packs_head, oid.hash, base_url);
2446 } else {
2447 data = strchrnul(data, '\n');
2448 }
2449 if (*data)
2450 data++; /* skip past newline */
2451 }
2452
2453 cleanup:
2454 free(url);
2455 return ret;
2456 }
2457
2458 void release_http_pack_request(struct http_pack_request *preq)
2459 {
2460 if (preq->packfile) {
2461 fclose(preq->packfile);
2462 preq->packfile = NULL;
2463 }
2464 preq->slot = NULL;
2465 strbuf_release(&preq->tmpfile);
2466 curl_slist_free_all(preq->headers);
2467 free(preq->url);
2468 free(preq);
2469 }
2470
2471 static const char *default_index_pack_args[] =
2472 {"index-pack", "--stdin", NULL};
2473
2474 int finish_http_pack_request(struct http_pack_request *preq)
2475 {
2476 struct child_process ip = CHILD_PROCESS_INIT;
2477 int tmpfile_fd;
2478 int ret = 0;
2479
2480 fclose(preq->packfile);
2481 preq->packfile = NULL;
2482
2483 tmpfile_fd = xopen(preq->tmpfile.buf, O_RDONLY);
2484
2485 ip.git_cmd = 1;
2486 ip.in = tmpfile_fd;
2487 strvec_pushv(&ip.args, preq->index_pack_args ?
2488 preq->index_pack_args :
2489 default_index_pack_args);
2490
2491 if (preq->preserve_index_pack_stdout)
2492 ip.out = 0;
2493 else
2494 ip.no_stdout = 1;
2495
2496 if (run_command(&ip)) {
2497 ret = -1;
2498 goto cleanup;
2499 }
2500
2501 cleanup:
2502 close(tmpfile_fd);
2503 unlink(preq->tmpfile.buf);
2504 return ret;
2505 }
2506
2507 void http_install_packfile(struct packed_git *p,
2508 struct packed_git **list_to_remove_from)
2509 {
2510 struct packed_git **lst = list_to_remove_from;
2511
2512 while (*lst != p)
2513 lst = &((*lst)->next);
2514 *lst = (*lst)->next;
2515
2516 install_packed_git(the_repository, p);
2517 }
2518
2519 struct http_pack_request *new_http_pack_request(
2520 const unsigned char *packed_git_hash, const char *base_url) {
2521
2522 struct strbuf buf = STRBUF_INIT;
2523
2524 end_url_with_slash(&buf, base_url);
2525 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2526 hash_to_hex(packed_git_hash));
2527 return new_direct_http_pack_request(packed_git_hash,
2528 strbuf_detach(&buf, NULL));
2529 }
2530
2531 struct http_pack_request *new_direct_http_pack_request(
2532 const unsigned char *packed_git_hash, char *url)
2533 {
2534 off_t prev_posn = 0;
2535 struct http_pack_request *preq;
2536
2537 CALLOC_ARRAY(preq, 1);
2538 strbuf_init(&preq->tmpfile, 0);
2539
2540 preq->url = url;
2541
2542 strbuf_addf(&preq->tmpfile, "%s.temp", sha1_pack_name(packed_git_hash));
2543 preq->packfile = fopen(preq->tmpfile.buf, "a");
2544 if (!preq->packfile) {
2545 error("Unable to open local file %s for pack",
2546 preq->tmpfile.buf);
2547 goto abort;
2548 }
2549
2550 preq->slot = get_active_slot();
2551 preq->headers = object_request_headers();
2552 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEDATA, preq->packfile);
2553 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2554 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2555 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER, preq->headers);
2556
2557 /*
2558 * If there is data present from a previous transfer attempt,
2559 * resume where it left off
2560 */
2561 prev_posn = ftello(preq->packfile);
2562 if (prev_posn>0) {
2563 if (http_is_verbose)
2564 fprintf(stderr,
2565 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2566 hash_to_hex(packed_git_hash),
2567 (uintmax_t)prev_posn);
2568 http_opt_request_remainder(preq->slot->curl, prev_posn);
2569 }
2570
2571 return preq;
2572
2573 abort:
2574 strbuf_release(&preq->tmpfile);
2575 free(preq->url);
2576 free(preq);
2577 return NULL;
2578 }
2579
2580 /* Helpers for fetching objects (loose) */
2581 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2582 void *data)
2583 {
2584 unsigned char expn[4096];
2585 size_t size = eltsize * nmemb;
2586 int posn = 0;
2587 struct http_object_request *freq = data;
2588 struct active_request_slot *slot = freq->slot;
2589
2590 if (slot) {
2591 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2592 &slot->http_code);
2593 if (c != CURLE_OK)
2594 BUG("curl_easy_getinfo for HTTP code failed: %s",
2595 curl_easy_strerror(c));
2596 if (slot->http_code >= 300)
2597 return nmemb;
2598 }
2599
2600 do {
2601 ssize_t retval = xwrite(freq->localfile,
2602 (char *) ptr + posn, size - posn);
2603 if (retval < 0)
2604 return posn / eltsize;
2605 posn += retval;
2606 } while (posn < size);
2607
2608 freq->stream.avail_in = size;
2609 freq->stream.next_in = (void *)ptr;
2610 do {
2611 freq->stream.next_out = expn;
2612 freq->stream.avail_out = sizeof(expn);
2613 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2614 the_hash_algo->update_fn(&freq->c, expn,
2615 sizeof(expn) - freq->stream.avail_out);
2616 } while (freq->stream.avail_in && freq->zret == Z_OK);
2617 return nmemb;
2618 }
2619
2620 struct http_object_request *new_http_object_request(const char *base_url,
2621 const struct object_id *oid)
2622 {
2623 char *hex = oid_to_hex(oid);
2624 struct strbuf filename = STRBUF_INIT;
2625 struct strbuf prevfile = STRBUF_INIT;
2626 int prevlocal;
2627 char prev_buf[PREV_BUF_SIZE];
2628 ssize_t prev_read = 0;
2629 off_t prev_posn = 0;
2630 struct http_object_request *freq;
2631
2632 CALLOC_ARRAY(freq, 1);
2633 strbuf_init(&freq->tmpfile, 0);
2634 oidcpy(&freq->oid, oid);
2635 freq->localfile = -1;
2636
2637 loose_object_path(the_repository, &filename, oid);
2638 strbuf_addf(&freq->tmpfile, "%s.temp", filename.buf);
2639
2640 strbuf_addf(&prevfile, "%s.prev", filename.buf);
2641 unlink_or_warn(prevfile.buf);
2642 rename(freq->tmpfile.buf, prevfile.buf);
2643 unlink_or_warn(freq->tmpfile.buf);
2644 strbuf_release(&filename);
2645
2646 if (freq->localfile != -1)
2647 error("fd leakage in start: %d", freq->localfile);
2648 freq->localfile = open(freq->tmpfile.buf,
2649 O_WRONLY | O_CREAT | O_EXCL, 0666);
2650 /*
2651 * This could have failed due to the "lazy directory creation";
2652 * try to mkdir the last path component.
2653 */
2654 if (freq->localfile < 0 && errno == ENOENT) {
2655 char *dir = strrchr(freq->tmpfile.buf, '/');
2656 if (dir) {
2657 *dir = 0;
2658 mkdir(freq->tmpfile.buf, 0777);
2659 *dir = '/';
2660 }
2661 freq->localfile = open(freq->tmpfile.buf,
2662 O_WRONLY | O_CREAT | O_EXCL, 0666);
2663 }
2664
2665 if (freq->localfile < 0) {
2666 error_errno("Couldn't create temporary file %s",
2667 freq->tmpfile.buf);
2668 goto abort;
2669 }
2670
2671 git_inflate_init(&freq->stream);
2672
2673 the_hash_algo->init_fn(&freq->c);
2674
2675 freq->url = get_remote_object_url(base_url, hex, 0);
2676
2677 /*
2678 * If a previous temp file is present, process what was already
2679 * fetched.
2680 */
2681 prevlocal = open(prevfile.buf, O_RDONLY);
2682 if (prevlocal != -1) {
2683 do {
2684 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2685 if (prev_read>0) {
2686 if (fwrite_sha1_file(prev_buf,
2687 1,
2688 prev_read,
2689 freq) == prev_read) {
2690 prev_posn += prev_read;
2691 } else {
2692 prev_read = -1;
2693 }
2694 }
2695 } while (prev_read > 0);
2696 close(prevlocal);
2697 }
2698 unlink_or_warn(prevfile.buf);
2699 strbuf_release(&prevfile);
2700
2701 /*
2702 * Reset inflate/SHA1 if there was an error reading the previous temp
2703 * file; also rewind to the beginning of the local file.
2704 */
2705 if (prev_read == -1) {
2706 memset(&freq->stream, 0, sizeof(freq->stream));
2707 git_inflate_init(&freq->stream);
2708 the_hash_algo->init_fn(&freq->c);
2709 if (prev_posn>0) {
2710 prev_posn = 0;
2711 lseek(freq->localfile, 0, SEEK_SET);
2712 if (ftruncate(freq->localfile, 0) < 0) {
2713 error_errno("Couldn't truncate temporary file %s",
2714 freq->tmpfile.buf);
2715 goto abort;
2716 }
2717 }
2718 }
2719
2720 freq->slot = get_active_slot();
2721 freq->headers = object_request_headers();
2722
2723 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEDATA, freq);
2724 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2725 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2726 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2727 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2728 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, freq->headers);
2729
2730 /*
2731 * If we have successfully processed data from a previous fetch
2732 * attempt, only fetch the data we don't already have.
2733 */
2734 if (prev_posn>0) {
2735 if (http_is_verbose)
2736 fprintf(stderr,
2737 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2738 hex, (uintmax_t)prev_posn);
2739 http_opt_request_remainder(freq->slot->curl, prev_posn);
2740 }
2741
2742 return freq;
2743
2744 abort:
2745 strbuf_release(&prevfile);
2746 free(freq->url);
2747 free(freq);
2748 return NULL;
2749 }
2750
2751 void process_http_object_request(struct http_object_request *freq)
2752 {
2753 if (!freq->slot)
2754 return;
2755 freq->curl_result = freq->slot->curl_result;
2756 freq->http_code = freq->slot->http_code;
2757 freq->slot = NULL;
2758 }
2759
2760 int finish_http_object_request(struct http_object_request *freq)
2761 {
2762 struct stat st;
2763 struct strbuf filename = STRBUF_INIT;
2764
2765 close(freq->localfile);
2766 freq->localfile = -1;
2767
2768 process_http_object_request(freq);
2769
2770 if (freq->http_code == 416) {
2771 warning("requested range invalid; we may already have all the data.");
2772 } else if (freq->curl_result != CURLE_OK) {
2773 if (stat(freq->tmpfile.buf, &st) == 0)
2774 if (st.st_size == 0)
2775 unlink_or_warn(freq->tmpfile.buf);
2776 return -1;
2777 }
2778
2779 git_inflate_end(&freq->stream);
2780 the_hash_algo->final_oid_fn(&freq->real_oid, &freq->c);
2781 if (freq->zret != Z_STREAM_END) {
2782 unlink_or_warn(freq->tmpfile.buf);
2783 return -1;
2784 }
2785 if (!oideq(&freq->oid, &freq->real_oid)) {
2786 unlink_or_warn(freq->tmpfile.buf);
2787 return -1;
2788 }
2789 loose_object_path(the_repository, &filename, &freq->oid);
2790 freq->rename = finalize_object_file(freq->tmpfile.buf, filename.buf);
2791 strbuf_release(&filename);
2792
2793 return freq->rename;
2794 }
2795
2796 void abort_http_object_request(struct http_object_request *freq)
2797 {
2798 unlink_or_warn(freq->tmpfile.buf);
2799
2800 release_http_object_request(freq);
2801 }
2802
2803 void release_http_object_request(struct http_object_request *freq)
2804 {
2805 if (freq->localfile != -1) {
2806 close(freq->localfile);
2807 freq->localfile = -1;
2808 }
2809 FREE_AND_NULL(freq->url);
2810 if (freq->slot) {
2811 freq->slot->callback_func = NULL;
2812 freq->slot->callback_data = NULL;
2813 release_active_slot(freq->slot);
2814 freq->slot = NULL;
2815 }
2816 curl_slist_free_all(freq->headers);
2817 strbuf_release(&freq->tmpfile);
2818 }
git for Debian