1#include "git-compat-util.h"
2#include "http.h"
3#include "config.h"
4#include "pack.h"
5#include "sideband.h"
6#include "run-command.h"
7#include "url.h"
8#include "urlmatch.h"
9#include "credential.h"
10#include "version.h"
11#include "pkt-line.h"
12#include "gettext.h"
13#include "transport.h"
14#include "packfile.h"
15
16static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
17#if LIBCURL_VERSION_NUM >= 0x070a08
18long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
19#else
20long int git_curl_ipresolve;
21#endif
22int active_requests;
23int http_is_verbose;
24ssize_t http_post_buffer = 16 * LARGE_PACKET_MAX;
25
26#if LIBCURL_VERSION_NUM >= 0x070a06
27#define LIBCURL_CAN_HANDLE_AUTH_ANY
28#endif
29
30static int min_curl_sessions = 1;
31static int curl_session_count;
32#ifdef USE_CURL_MULTI
33static int max_requests = -1;
34static CURLM *curlm;
35#endif
36#ifndef NO_CURL_EASY_DUPHANDLE
37static CURL *curl_default;
38#endif
39
40#define PREV_BUF_SIZE 4096
41
42char curl_errorstr[CURL_ERROR_SIZE];
43
44static int curl_ssl_verify = -1;
45static int curl_ssl_try;
46static const char *ssl_cert;
47static const char *ssl_cipherlist;
48static const char *ssl_version;
49static struct {
50 const char *name;
51 long ssl_version;
52} sslversions[] = {
53 { "sslv2", CURL_SSLVERSION_SSLv2 },
54 { "sslv3", CURL_SSLVERSION_SSLv3 },
55 { "tlsv1", CURL_SSLVERSION_TLSv1 },
56#if LIBCURL_VERSION_NUM >= 0x072200
57 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
58 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
59 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
60#endif
61};
62#if LIBCURL_VERSION_NUM >= 0x070903
63static const char *ssl_key;
64#endif
65#if LIBCURL_VERSION_NUM >= 0x070908
66static const char *ssl_capath;
67#endif
68#if LIBCURL_VERSION_NUM >= 0x072c00
69static const char *ssl_pinnedkey;
70#endif
71static const char *ssl_cainfo;
72static long curl_low_speed_limit = -1;
73static long curl_low_speed_time = -1;
74static int curl_ftp_no_epsv;
75static const char *curl_http_proxy;
76static const char *curl_no_proxy;
77static const char *http_proxy_authmethod;
78static struct {
79 const char *name;
80 long curlauth_param;
81} proxy_authmethods[] = {
82 { "basic", CURLAUTH_BASIC },
83 { "digest", CURLAUTH_DIGEST },
84 { "negotiate", CURLAUTH_GSSNEGOTIATE },
85 { "ntlm", CURLAUTH_NTLM },
86#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
87 { "anyauth", CURLAUTH_ANY },
88#endif
89 /*
90 * CURLAUTH_DIGEST_IE has no corresponding command-line option in
91 * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
92 * here, too
93 */
94};
95#ifdef CURLGSSAPI_DELEGATION_FLAG
96static const char *curl_deleg;
97static struct {
98 const char *name;
99 long curl_deleg_param;
100} curl_deleg_levels[] = {
101 { "none", CURLGSSAPI_DELEGATION_NONE },
102 { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
103 { "always", CURLGSSAPI_DELEGATION_FLAG },
104};
105#endif
106
107static struct credential proxy_auth = CREDENTIAL_INIT;
108static const char *curl_proxyuserpwd;
109static const char *curl_cookie_file;
110static int curl_save_cookies;
111struct credential http_auth = CREDENTIAL_INIT;
112static int http_proactive_auth;
113static const char *user_agent;
114static int curl_empty_auth = -1;
115
116enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
117
118#if LIBCURL_VERSION_NUM >= 0x071700
119/* Use CURLOPT_KEYPASSWD as is */
120#elif LIBCURL_VERSION_NUM >= 0x070903
121#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
122#else
123#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
124#endif
125
126static struct credential cert_auth = CREDENTIAL_INIT;
127static int ssl_cert_password_required;
128#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
129static unsigned long http_auth_methods = CURLAUTH_ANY;
130static int http_auth_methods_restricted;
131/* Modes for which empty_auth cannot actually help us. */
132static unsigned long empty_auth_useless =
133 CURLAUTH_BASIC
134#ifdef CURLAUTH_DIGEST_IE
135 | CURLAUTH_DIGEST_IE
136#endif
137 | CURLAUTH_DIGEST;
138#endif
139
140static struct curl_slist *pragma_header;
141static struct curl_slist *no_pragma_header;
142static struct curl_slist *extra_http_headers;
143
144static struct active_request_slot *active_queue_head;
145
146static char *cached_accept_language;
147
148size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
149{
150 size_t size = eltsize * nmemb;
151 struct buffer *buffer = buffer_;
152
153 if (size > buffer->buf.len - buffer->posn)
154 size = buffer->buf.len - buffer->posn;
155 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
156 buffer->posn += size;
157
158 return size;
159}
160
161#ifndef NO_CURL_IOCTL
162curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
163{
164 struct buffer *buffer = clientp;
165
166 switch (cmd) {
167 case CURLIOCMD_NOP:
168 return CURLIOE_OK;
169
170 case CURLIOCMD_RESTARTREAD:
171 buffer->posn = 0;
172 return CURLIOE_OK;
173
174 default:
175 return CURLIOE_UNKNOWNCMD;
176 }
177}
178#endif
179
180size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
181{
182 size_t size = eltsize * nmemb;
183 struct strbuf *buffer = buffer_;
184
185 strbuf_add(buffer, ptr, size);
186 return size;
187}
188
189size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
190{
191 return eltsize * nmemb;
192}
193
194static void closedown_active_slot(struct active_request_slot *slot)
195{
196 active_requests--;
197 slot->in_use = 0;
198}
199
200static void finish_active_slot(struct active_request_slot *slot)
201{
202 closedown_active_slot(slot);
203 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
204
205 if (slot->finished != NULL)
206 (*slot->finished) = 1;
207
208 /* Store slot results so they can be read after the slot is reused */
209 if (slot->results != NULL) {
210 slot->results->curl_result = slot->curl_result;
211 slot->results->http_code = slot->http_code;
212#if LIBCURL_VERSION_NUM >= 0x070a08
213 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
214 &slot->results->auth_avail);
215#else
216 slot->results->auth_avail = 0;
217#endif
218
219 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
220 &slot->results->http_connectcode);
221 }
222
223 /* Run callback if appropriate */
224 if (slot->callback_func != NULL)
225 slot->callback_func(slot->callback_data);
226}
227
228static void xmulti_remove_handle(struct active_request_slot *slot)
229{
230#ifdef USE_CURL_MULTI
231 curl_multi_remove_handle(curlm, slot->curl);
232#endif
233}
234
235#ifdef USE_CURL_MULTI
236static void process_curl_messages(void)
237{
238 int num_messages;
239 struct active_request_slot *slot;
240 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
241
242 while (curl_message != NULL) {
243 if (curl_message->msg == CURLMSG_DONE) {
244 int curl_result = curl_message->data.result;
245 slot = active_queue_head;
246 while (slot != NULL &&
247 slot->curl != curl_message->easy_handle)
248 slot = slot->next;
249 if (slot != NULL) {
250 xmulti_remove_handle(slot);
251 slot->curl_result = curl_result;
252 finish_active_slot(slot);
253 } else {
254 fprintf(stderr, "Received DONE message for unknown request!\n");
255 }
256 } else {
257 fprintf(stderr, "Unknown CURL message received: %d\n",
258 (int)curl_message->msg);
259 }
260 curl_message = curl_multi_info_read(curlm, &num_messages);
261 }
262}
263#endif
264
265static int http_options(const char *var, const char *value, void *cb)
266{
267 if (!strcmp("http.sslverify", var)) {
268 curl_ssl_verify = git_config_bool(var, value);
269 return 0;
270 }
271 if (!strcmp("http.sslcipherlist", var))
272 return git_config_string(&ssl_cipherlist, var, value);
273 if (!strcmp("http.sslversion", var))
274 return git_config_string(&ssl_version, var, value);
275 if (!strcmp("http.sslcert", var))
276 return git_config_pathname(&ssl_cert, var, value);
277#if LIBCURL_VERSION_NUM >= 0x070903
278 if (!strcmp("http.sslkey", var))
279 return git_config_pathname(&ssl_key, var, value);
280#endif
281#if LIBCURL_VERSION_NUM >= 0x070908
282 if (!strcmp("http.sslcapath", var))
283 return git_config_pathname(&ssl_capath, var, value);
284#endif
285 if (!strcmp("http.sslcainfo", var))
286 return git_config_pathname(&ssl_cainfo, var, value);
287 if (!strcmp("http.sslcertpasswordprotected", var)) {
288 ssl_cert_password_required = git_config_bool(var, value);
289 return 0;
290 }
291 if (!strcmp("http.ssltry", var)) {
292 curl_ssl_try = git_config_bool(var, value);
293 return 0;
294 }
295 if (!strcmp("http.minsessions", var)) {
296 min_curl_sessions = git_config_int(var, value);
297#ifndef USE_CURL_MULTI
298 if (min_curl_sessions > 1)
299 min_curl_sessions = 1;
300#endif
301 return 0;
302 }
303#ifdef USE_CURL_MULTI
304 if (!strcmp("http.maxrequests", var)) {
305 max_requests = git_config_int(var, value);
306 return 0;
307 }
308#endif
309 if (!strcmp("http.lowspeedlimit", var)) {
310 curl_low_speed_limit = (long)git_config_int(var, value);
311 return 0;
312 }
313 if (!strcmp("http.lowspeedtime", var)) {
314 curl_low_speed_time = (long)git_config_int(var, value);
315 return 0;
316 }
317
318 if (!strcmp("http.noepsv", var)) {
319 curl_ftp_no_epsv = git_config_bool(var, value);
320 return 0;
321 }
322 if (!strcmp("http.proxy", var))
323 return git_config_string(&curl_http_proxy, var, value);
324
325 if (!strcmp("http.proxyauthmethod", var))
326 return git_config_string(&http_proxy_authmethod, var, value);
327
328 if (!strcmp("http.cookiefile", var))
329 return git_config_pathname(&curl_cookie_file, var, value);
330 if (!strcmp("http.savecookies", var)) {
331 curl_save_cookies = git_config_bool(var, value);
332 return 0;
333 }
334
335 if (!strcmp("http.postbuffer", var)) {
336 http_post_buffer = git_config_ssize_t(var, value);
337 if (http_post_buffer < 0)
338 warning(_("negative value for http.postbuffer; defaulting to %d"), LARGE_PACKET_MAX);
339 if (http_post_buffer < LARGE_PACKET_MAX)
340 http_post_buffer = LARGE_PACKET_MAX;
341 return 0;
342 }
343
344 if (!strcmp("http.useragent", var))
345 return git_config_string(&user_agent, var, value);
346
347 if (!strcmp("http.emptyauth", var)) {
348 if (value && !strcmp("auto", value))
349 curl_empty_auth = -1;
350 else
351 curl_empty_auth = git_config_bool(var, value);
352 return 0;
353 }
354
355 if (!strcmp("http.delegation", var)) {
356#ifdef CURLGSSAPI_DELEGATION_FLAG
357 return git_config_string(&curl_deleg, var, value);
358#else
359 warning(_("Delegation control is not supported with cURL < 7.22.0"));
360 return 0;
361#endif
362 }
363
364 if (!strcmp("http.pinnedpubkey", var)) {
365#if LIBCURL_VERSION_NUM >= 0x072c00
366 return git_config_pathname(&ssl_pinnedkey, var, value);
367#else
368 warning(_("Public key pinning not supported with cURL < 7.44.0"));
369 return 0;
370#endif
371 }
372
373 if (!strcmp("http.extraheader", var)) {
374 if (!value) {
375 return config_error_nonbool(var);
376 } else if (!*value) {
377 curl_slist_free_all(extra_http_headers);
378 extra_http_headers = NULL;
379 } else {
380 extra_http_headers =
381 curl_slist_append(extra_http_headers, value);
382 }
383 return 0;
384 }
385
386 if (!strcmp("http.followredirects", var)) {
387 if (value && !strcmp(value, "initial"))
388 http_follow_config = HTTP_FOLLOW_INITIAL;
389 else if (git_config_bool(var, value))
390 http_follow_config = HTTP_FOLLOW_ALWAYS;
391 else
392 http_follow_config = HTTP_FOLLOW_NONE;
393 return 0;
394 }
395
396 /* Fall back on the default ones */
397 return git_default_config(var, value, cb);
398}
399
400static int curl_empty_auth_enabled(void)
401{
402 if (curl_empty_auth >= 0)
403 return curl_empty_auth;
404
405#ifndef LIBCURL_CAN_HANDLE_AUTH_ANY
406 /*
407 * Our libcurl is too old to do AUTH_ANY in the first place;
408 * just default to turning the feature off.
409 */
410#else
411 /*
412 * In the automatic case, kick in the empty-auth
413 * hack as long as we would potentially try some
414 * method more exotic than "Basic" or "Digest".
415 *
416 * But only do this when this is our second or
417 * subsequent request, as by then we know what
418 * methods are available.
419 */
420 if (http_auth_methods_restricted &&
421 (http_auth_methods & ~empty_auth_useless))
422 return 1;
423#endif
424 return 0;
425}
426
427static void init_curl_http_auth(CURL *result)
428{
429 if (!http_auth.username || !*http_auth.username) {
430 if (curl_empty_auth_enabled())
431 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
432 return;
433 }
434
435 credential_fill(&http_auth);
436
437#if LIBCURL_VERSION_NUM >= 0x071301
438 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
439 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
440#else
441 {
442 static struct strbuf up = STRBUF_INIT;
443 /*
444 * Note that we assume we only ever have a single set of
445 * credentials in a given program run, so we do not have
446 * to worry about updating this buffer, only setting its
447 * initial value.
448 */
449 if (!up.len)
450 strbuf_addf(&up, "%s:%s",
451 http_auth.username, http_auth.password);
452 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
453 }
454#endif
455}
456
457/* *var must be free-able */
458static void var_override(const char **var, char *value)
459{
460 if (value) {
461 free((void *)*var);
462 *var = xstrdup(value);
463 }
464}
465
466static void set_proxyauth_name_password(CURL *result)
467{
468#if LIBCURL_VERSION_NUM >= 0x071301
469 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
470 proxy_auth.username);
471 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
472 proxy_auth.password);
473#else
474 struct strbuf s = STRBUF_INIT;
475
476 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
477 strbuf_addch(&s, ':');
478 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
479 curl_proxyuserpwd = strbuf_detach(&s, NULL);
480 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
481#endif
482}
483
484static void init_curl_proxy_auth(CURL *result)
485{
486 if (proxy_auth.username) {
487 if (!proxy_auth.password)
488 credential_fill(&proxy_auth);
489 set_proxyauth_name_password(result);
490 }
491
492 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
493
494#if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
495 if (http_proxy_authmethod) {
496 int i;
497 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
498 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
499 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
500 proxy_authmethods[i].curlauth_param);
501 break;
502 }
503 }
504 if (i == ARRAY_SIZE(proxy_authmethods)) {
505 warning("unsupported proxy authentication method %s: using anyauth",
506 http_proxy_authmethod);
507 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
508 }
509 }
510 else
511 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
512#endif
513}
514
515static int has_cert_password(void)
516{
517 if (ssl_cert == NULL || ssl_cert_password_required != 1)
518 return 0;
519 if (!cert_auth.password) {
520 cert_auth.protocol = xstrdup("cert");
521 cert_auth.username = xstrdup("");
522 cert_auth.path = xstrdup(ssl_cert);
523 credential_fill(&cert_auth);
524 }
525 return 1;
526}
527
528#if LIBCURL_VERSION_NUM >= 0x071900
529static void set_curl_keepalive(CURL *c)
530{
531 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
532}
533
534#elif LIBCURL_VERSION_NUM >= 0x071000
535static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
536{
537 int ka = 1;
538 int rc;
539 socklen_t len = (socklen_t)sizeof(ka);
540
541 if (type != CURLSOCKTYPE_IPCXN)
542 return 0;
543
544 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
545 if (rc < 0)
546 warning_errno("unable to set SO_KEEPALIVE on socket");
547
548 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
549}
550
551static void set_curl_keepalive(CURL *c)
552{
553 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
554}
555
556#else
557static void set_curl_keepalive(CURL *c)
558{
559 /* not supported on older curl versions */
560}
561#endif
562
563static void redact_sensitive_header(struct strbuf *header)
564{
565 const char *sensitive_header;
566
567 if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
568 skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
569 /* The first token is the type, which is OK to log */
570 while (isspace(*sensitive_header))
571 sensitive_header++;
572 while (*sensitive_header && !isspace(*sensitive_header))
573 sensitive_header++;
574 /* Everything else is opaque and possibly sensitive */
575 strbuf_setlen(header, sensitive_header - header->buf);
576 strbuf_addstr(header, " <redacted>");
577 }
578}
579
580static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
581{
582 struct strbuf out = STRBUF_INIT;
583 struct strbuf **headers, **header;
584
585 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
586 text, (long)size, (long)size);
587 trace_strbuf(&trace_curl, &out);
588 strbuf_reset(&out);
589 strbuf_add(&out, ptr, size);
590 headers = strbuf_split_max(&out, '\n', 0);
591
592 for (header = headers; *header; header++) {
593 if (hide_sensitive_header)
594 redact_sensitive_header(*header);
595 strbuf_insert((*header), 0, text, strlen(text));
596 strbuf_insert((*header), strlen(text), ": ", 2);
597 strbuf_rtrim((*header));
598 strbuf_addch((*header), '\n');
599 trace_strbuf(&trace_curl, (*header));
600 }
601 strbuf_list_free(headers);
602 strbuf_release(&out);
603}
604
605static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
606{
607 size_t i;
608 struct strbuf out = STRBUF_INIT;
609 unsigned int width = 60;
610
611 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
612 text, (long)size, (long)size);
613 trace_strbuf(&trace_curl, &out);
614
615 for (i = 0; i < size; i += width) {
616 size_t w;
617
618 strbuf_reset(&out);
619 strbuf_addf(&out, "%s: ", text);
620 for (w = 0; (w < width) && (i + w < size); w++) {
621 unsigned char ch = ptr[i + w];
622
623 strbuf_addch(&out,
624 (ch >= 0x20) && (ch < 0x80)
625 ? ch : '.');
626 }
627 strbuf_addch(&out, '\n');
628 trace_strbuf(&trace_curl, &out);
629 }
630 strbuf_release(&out);
631}
632
633static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
634{
635 const char *text;
636 enum { NO_FILTER = 0, DO_FILTER = 1 };
637
638 switch (type) {
639 case CURLINFO_TEXT:
640 trace_printf_key(&trace_curl, "== Info: %s", data);
641 break;
642 case CURLINFO_HEADER_OUT:
643 text = "=> Send header";
644 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
645 break;
646 case CURLINFO_DATA_OUT:
647 text = "=> Send data";
648 curl_dump_data(text, (unsigned char *)data, size);
649 break;
650 case CURLINFO_SSL_DATA_OUT:
651 text = "=> Send SSL data";
652 curl_dump_data(text, (unsigned char *)data, size);
653 break;
654 case CURLINFO_HEADER_IN:
655 text = "<= Recv header";
656 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
657 break;
658 case CURLINFO_DATA_IN:
659 text = "<= Recv data";
660 curl_dump_data(text, (unsigned char *)data, size);
661 break;
662 case CURLINFO_SSL_DATA_IN:
663 text = "<= Recv SSL data";
664 curl_dump_data(text, (unsigned char *)data, size);
665 break;
666
667 default: /* we ignore unknown types by default */
668 return 0;
669 }
670 return 0;
671}
672
673void setup_curl_trace(CURL *handle)
674{
675 if (!trace_want(&trace_curl))
676 return;
677 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
678 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
679 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
680}
681
682#ifdef CURLPROTO_HTTP
683static long get_curl_allowed_protocols(int from_user)
684{
685 long allowed_protocols = 0;
686
687 if (is_transport_allowed("http", from_user))
688 allowed_protocols |= CURLPROTO_HTTP;
689 if (is_transport_allowed("https", from_user))
690 allowed_protocols |= CURLPROTO_HTTPS;
691 if (is_transport_allowed("ftp", from_user))
692 allowed_protocols |= CURLPROTO_FTP;
693 if (is_transport_allowed("ftps", from_user))
694 allowed_protocols |= CURLPROTO_FTPS;
695
696 return allowed_protocols;
697}
698#endif
699
700static CURL *get_curl_handle(void)
701{
702 CURL *result = curl_easy_init();
703
704 if (!result)
705 die("curl_easy_init failed");
706
707 if (!curl_ssl_verify) {
708 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
709 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
710 } else {
711 /* Verify authenticity of the peer's certificate */
712 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
713 /* The name in the cert must match whom we tried to connect */
714 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
715 }
716
717#if LIBCURL_VERSION_NUM >= 0x070907
718 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
719#endif
720#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
721 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
722#endif
723
724#ifdef CURLGSSAPI_DELEGATION_FLAG
725 if (curl_deleg) {
726 int i;
727 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
728 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
729 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
730 curl_deleg_levels[i].curl_deleg_param);
731 break;
732 }
733 }
734 if (i == ARRAY_SIZE(curl_deleg_levels))
735 warning("Unknown delegation method '%s': using default",
736 curl_deleg);
737 }
738#endif
739
740 if (http_proactive_auth)
741 init_curl_http_auth(result);
742
743 if (getenv("GIT_SSL_VERSION"))
744 ssl_version = getenv("GIT_SSL_VERSION");
745 if (ssl_version && *ssl_version) {
746 int i;
747 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
748 if (!strcmp(ssl_version, sslversions[i].name)) {
749 curl_easy_setopt(result, CURLOPT_SSLVERSION,
750 sslversions[i].ssl_version);
751 break;
752 }
753 }
754 if (i == ARRAY_SIZE(sslversions))
755 warning("unsupported ssl version %s: using default",
756 ssl_version);
757 }
758
759 if (getenv("GIT_SSL_CIPHER_LIST"))
760 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
761 if (ssl_cipherlist != NULL && *ssl_cipherlist)
762 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
763 ssl_cipherlist);
764
765 if (ssl_cert != NULL)
766 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
767 if (has_cert_password())
768 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
769#if LIBCURL_VERSION_NUM >= 0x070903
770 if (ssl_key != NULL)
771 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
772#endif
773#if LIBCURL_VERSION_NUM >= 0x070908
774 if (ssl_capath != NULL)
775 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
776#endif
777#if LIBCURL_VERSION_NUM >= 0x072c00
778 if (ssl_pinnedkey != NULL)
779 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
780#endif
781 if (ssl_cainfo != NULL)
782 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
783
784 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
785 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
786 curl_low_speed_limit);
787 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
788 curl_low_speed_time);
789 }
790
791 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
792#if LIBCURL_VERSION_NUM >= 0x071301
793 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
794#elif LIBCURL_VERSION_NUM >= 0x071101
795 curl_easy_setopt(result, CURLOPT_POST301, 1);
796#endif
797#ifdef CURLPROTO_HTTP
798 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
799 get_curl_allowed_protocols(0));
800 curl_easy_setopt(result, CURLOPT_PROTOCOLS,
801 get_curl_allowed_protocols(-1));
802#else
803 warning("protocol restrictions not applied to curl redirects because\n"
804 "your curl version is too old (>= 7.19.4)");
805#endif
806 if (getenv("GIT_CURL_VERBOSE"))
807 curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
808 setup_curl_trace(result);
809
810 curl_easy_setopt(result, CURLOPT_USERAGENT,
811 user_agent ? user_agent : git_user_agent());
812
813 if (curl_ftp_no_epsv)
814 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
815
816#ifdef CURLOPT_USE_SSL
817 if (curl_ssl_try)
818 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
819#endif
820
821 /*
822 * CURL also examines these variables as a fallback; but we need to query
823 * them here in order to decide whether to prompt for missing password (cf.
824 * init_curl_proxy_auth()).
825 *
826 * Unlike many other common environment variables, these are historically
827 * lowercase only. It appears that CURL did not know this and implemented
828 * only uppercase variants, which was later corrected to take both - with
829 * the exception of http_proxy, which is lowercase only also in CURL. As
830 * the lowercase versions are the historical quasi-standard, they take
831 * precedence here, as in CURL.
832 */
833 if (!curl_http_proxy) {
834 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
835 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
836 var_override(&curl_http_proxy, getenv("https_proxy"));
837 } else {
838 var_override(&curl_http_proxy, getenv("http_proxy"));
839 }
840 if (!curl_http_proxy) {
841 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
842 var_override(&curl_http_proxy, getenv("all_proxy"));
843 }
844 }
845
846 if (curl_http_proxy && curl_http_proxy[0] == '\0') {
847 /*
848 * Handle case with the empty http.proxy value here to keep
849 * common code clean.
850 * NB: empty option disables proxying at all.
851 */
852 curl_easy_setopt(result, CURLOPT_PROXY, "");
853 } else if (curl_http_proxy) {
854#if LIBCURL_VERSION_NUM >= 0x071800
855 if (starts_with(curl_http_proxy, "socks5h"))
856 curl_easy_setopt(result,
857 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
858 else if (starts_with(curl_http_proxy, "socks5"))
859 curl_easy_setopt(result,
860 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
861 else if (starts_with(curl_http_proxy, "socks4a"))
862 curl_easy_setopt(result,
863 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
864 else if (starts_with(curl_http_proxy, "socks"))
865 curl_easy_setopt(result,
866 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
867#endif
868#if LIBCURL_VERSION_NUM >= 0x073400
869 else if (starts_with(curl_http_proxy, "https"))
870 curl_easy_setopt(result,
871 CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
872#endif
873 if (strstr(curl_http_proxy, "://"))
874 credential_from_url(&proxy_auth, curl_http_proxy);
875 else {
876 struct strbuf url = STRBUF_INIT;
877 strbuf_addf(&url, "http://%s", curl_http_proxy);
878 credential_from_url(&proxy_auth, url.buf);
879 strbuf_release(&url);
880 }
881
882 if (!proxy_auth.host)
883 die("Invalid proxy URL '%s'", curl_http_proxy);
884
885 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
886#if LIBCURL_VERSION_NUM >= 0x071304
887 var_override(&curl_no_proxy, getenv("NO_PROXY"));
888 var_override(&curl_no_proxy, getenv("no_proxy"));
889 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
890#endif
891 }
892 init_curl_proxy_auth(result);
893
894 set_curl_keepalive(result);
895
896 return result;
897}
898
899static void set_from_env(const char **var, const char *envname)
900{
901 const char *val = getenv(envname);
902 if (val)
903 *var = val;
904}
905
906void http_init(struct remote *remote, const char *url, int proactive_auth)
907{
908 char *low_speed_limit;
909 char *low_speed_time;
910 char *normalized_url;
911 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
912
913 config.section = "http";
914 config.key = NULL;
915 config.collect_fn = http_options;
916 config.cascade_fn = git_default_config;
917 config.cb = NULL;
918
919 http_is_verbose = 0;
920 normalized_url = url_normalize(url, &config.url);
921
922 git_config(urlmatch_config_entry, &config);
923 free(normalized_url);
924
925 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
926 die("curl_global_init failed");
927
928 http_proactive_auth = proactive_auth;
929
930 if (remote && remote->http_proxy)
931 curl_http_proxy = xstrdup(remote->http_proxy);
932
933 if (remote)
934 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
935
936 pragma_header = curl_slist_append(http_copy_default_headers(),
937 "Pragma: no-cache");
938 no_pragma_header = curl_slist_append(http_copy_default_headers(),
939 "Pragma:");
940
941#ifdef USE_CURL_MULTI
942 {
943 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
944 if (http_max_requests != NULL)
945 max_requests = atoi(http_max_requests);
946 }
947
948 curlm = curl_multi_init();
949 if (!curlm)
950 die("curl_multi_init failed");
951#endif
952
953 if (getenv("GIT_SSL_NO_VERIFY"))
954 curl_ssl_verify = 0;
955
956 set_from_env(&ssl_cert, "GIT_SSL_CERT");
957#if LIBCURL_VERSION_NUM >= 0x070903
958 set_from_env(&ssl_key, "GIT_SSL_KEY");
959#endif
960#if LIBCURL_VERSION_NUM >= 0x070908
961 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
962#endif
963 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
964
965 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
966
967 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
968 if (low_speed_limit != NULL)
969 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
970 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
971 if (low_speed_time != NULL)
972 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
973
974 if (curl_ssl_verify == -1)
975 curl_ssl_verify = 1;
976
977 curl_session_count = 0;
978#ifdef USE_CURL_MULTI
979 if (max_requests < 1)
980 max_requests = DEFAULT_MAX_REQUESTS;
981#endif
982
983 if (getenv("GIT_CURL_FTP_NO_EPSV"))
984 curl_ftp_no_epsv = 1;
985
986 if (url) {
987 credential_from_url(&http_auth, url);
988 if (!ssl_cert_password_required &&
989 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
990 starts_with(url, "https://"))
991 ssl_cert_password_required = 1;
992 }
993
994#ifndef NO_CURL_EASY_DUPHANDLE
995 curl_default = get_curl_handle();
996#endif
997}
998
999void http_cleanup(void)
1000{
1001 struct active_request_slot *slot = active_queue_head;
1002
1003 while (slot != NULL) {
1004 struct active_request_slot *next = slot->next;
1005 if (slot->curl != NULL) {
1006 xmulti_remove_handle(slot);
1007 curl_easy_cleanup(slot->curl);
1008 }
1009 free(slot);
1010 slot = next;
1011 }
1012 active_queue_head = NULL;
1013
1014#ifndef NO_CURL_EASY_DUPHANDLE
1015 curl_easy_cleanup(curl_default);
1016#endif
1017
1018#ifdef USE_CURL_MULTI
1019 curl_multi_cleanup(curlm);
1020#endif
1021 curl_global_cleanup();
1022
1023 curl_slist_free_all(extra_http_headers);
1024 extra_http_headers = NULL;
1025
1026 curl_slist_free_all(pragma_header);
1027 pragma_header = NULL;
1028
1029 curl_slist_free_all(no_pragma_header);
1030 no_pragma_header = NULL;
1031
1032 if (curl_http_proxy) {
1033 free((void *)curl_http_proxy);
1034 curl_http_proxy = NULL;
1035 }
1036
1037 if (proxy_auth.password) {
1038 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1039 FREE_AND_NULL(proxy_auth.password);
1040 }
1041
1042 free((void *)curl_proxyuserpwd);
1043 curl_proxyuserpwd = NULL;
1044
1045 free((void *)http_proxy_authmethod);
1046 http_proxy_authmethod = NULL;
1047
1048 if (cert_auth.password != NULL) {
1049 memset(cert_auth.password, 0, strlen(cert_auth.password));
1050 FREE_AND_NULL(cert_auth.password);
1051 }
1052 ssl_cert_password_required = 0;
1053
1054 FREE_AND_NULL(cached_accept_language);
1055}
1056
1057struct active_request_slot *get_active_slot(void)
1058{
1059 struct active_request_slot *slot = active_queue_head;
1060 struct active_request_slot *newslot;
1061
1062#ifdef USE_CURL_MULTI
1063 int num_transfers;
1064
1065 /* Wait for a slot to open up if the queue is full */
1066 while (active_requests >= max_requests) {
1067 curl_multi_perform(curlm, &num_transfers);
1068 if (num_transfers < active_requests)
1069 process_curl_messages();
1070 }
1071#endif
1072
1073 while (slot != NULL && slot->in_use)
1074 slot = slot->next;
1075
1076 if (slot == NULL) {
1077 newslot = xmalloc(sizeof(*newslot));
1078 newslot->curl = NULL;
1079 newslot->in_use = 0;
1080 newslot->next = NULL;
1081
1082 slot = active_queue_head;
1083 if (slot == NULL) {
1084 active_queue_head = newslot;
1085 } else {
1086 while (slot->next != NULL)
1087 slot = slot->next;
1088 slot->next = newslot;
1089 }
1090 slot = newslot;
1091 }
1092
1093 if (slot->curl == NULL) {
1094#ifdef NO_CURL_EASY_DUPHANDLE
1095 slot->curl = get_curl_handle();
1096#else
1097 slot->curl = curl_easy_duphandle(curl_default);
1098#endif
1099 curl_session_count++;
1100 }
1101
1102 active_requests++;
1103 slot->in_use = 1;
1104 slot->results = NULL;
1105 slot->finished = NULL;
1106 slot->callback_data = NULL;
1107 slot->callback_func = NULL;
1108 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1109 if (curl_save_cookies)
1110 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1111 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1112 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1113 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1114 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1115 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1116 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1117 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1118 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1119 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1120 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1121
1122 /*
1123 * Default following to off unless "ALWAYS" is configured; this gives
1124 * callers a sane starting point, and they can tweak for individual
1125 * HTTP_FOLLOW_* cases themselves.
1126 */
1127 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1128 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1129 else
1130 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1131
1132#if LIBCURL_VERSION_NUM >= 0x070a08
1133 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1134#endif
1135#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1136 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1137#endif
1138 if (http_auth.password || curl_empty_auth_enabled())
1139 init_curl_http_auth(slot->curl);
1140
1141 return slot;
1142}
1143
1144int start_active_slot(struct active_request_slot *slot)
1145{
1146#ifdef USE_CURL_MULTI
1147 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1148 int num_transfers;
1149
1150 if (curlm_result != CURLM_OK &&
1151 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1152 warning("curl_multi_add_handle failed: %s",
1153 curl_multi_strerror(curlm_result));
1154 active_requests--;
1155 slot->in_use = 0;
1156 return 0;
1157 }
1158
1159 /*
1160 * We know there must be something to do, since we just added
1161 * something.
1162 */
1163 curl_multi_perform(curlm, &num_transfers);
1164#endif
1165 return 1;
1166}
1167
1168#ifdef USE_CURL_MULTI
1169struct fill_chain {
1170 void *data;
1171 int (*fill)(void *);
1172 struct fill_chain *next;
1173};
1174
1175static struct fill_chain *fill_cfg;
1176
1177void add_fill_function(void *data, int (*fill)(void *))
1178{
1179 struct fill_chain *new = xmalloc(sizeof(*new));
1180 struct fill_chain **linkp = &fill_cfg;
1181 new->data = data;
1182 new->fill = fill;
1183 new->next = NULL;
1184 while (*linkp)
1185 linkp = &(*linkp)->next;
1186 *linkp = new;
1187}
1188
1189void fill_active_slots(void)
1190{
1191 struct active_request_slot *slot = active_queue_head;
1192
1193 while (active_requests < max_requests) {
1194 struct fill_chain *fill;
1195 for (fill = fill_cfg; fill; fill = fill->next)
1196 if (fill->fill(fill->data))
1197 break;
1198
1199 if (!fill)
1200 break;
1201 }
1202
1203 while (slot != NULL) {
1204 if (!slot->in_use && slot->curl != NULL
1205 && curl_session_count > min_curl_sessions) {
1206 curl_easy_cleanup(slot->curl);
1207 slot->curl = NULL;
1208 curl_session_count--;
1209 }
1210 slot = slot->next;
1211 }
1212}
1213
1214void step_active_slots(void)
1215{
1216 int num_transfers;
1217 CURLMcode curlm_result;
1218
1219 do {
1220 curlm_result = curl_multi_perform(curlm, &num_transfers);
1221 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1222 if (num_transfers < active_requests) {
1223 process_curl_messages();
1224 fill_active_slots();
1225 }
1226}
1227#endif
1228
1229void run_active_slot(struct active_request_slot *slot)
1230{
1231#ifdef USE_CURL_MULTI
1232 fd_set readfds;
1233 fd_set writefds;
1234 fd_set excfds;
1235 int max_fd;
1236 struct timeval select_timeout;
1237 int finished = 0;
1238
1239 slot->finished = &finished;
1240 while (!finished) {
1241 step_active_slots();
1242
1243 if (slot->in_use) {
1244#if LIBCURL_VERSION_NUM >= 0x070f04
1245 long curl_timeout;
1246 curl_multi_timeout(curlm, &curl_timeout);
1247 if (curl_timeout == 0) {
1248 continue;
1249 } else if (curl_timeout == -1) {
1250 select_timeout.tv_sec = 0;
1251 select_timeout.tv_usec = 50000;
1252 } else {
1253 select_timeout.tv_sec = curl_timeout / 1000;
1254 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1255 }
1256#else
1257 select_timeout.tv_sec = 0;
1258 select_timeout.tv_usec = 50000;
1259#endif
1260
1261 max_fd = -1;
1262 FD_ZERO(&readfds);
1263 FD_ZERO(&writefds);
1264 FD_ZERO(&excfds);
1265 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1266
1267 /*
1268 * It can happen that curl_multi_timeout returns a pathologically
1269 * long timeout when curl_multi_fdset returns no file descriptors
1270 * to read. See commit message for more details.
1271 */
1272 if (max_fd < 0 &&
1273 (select_timeout.tv_sec > 0 ||
1274 select_timeout.tv_usec > 50000)) {
1275 select_timeout.tv_sec = 0;
1276 select_timeout.tv_usec = 50000;
1277 }
1278
1279 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1280 }
1281 }
1282#else
1283 while (slot->in_use) {
1284 slot->curl_result = curl_easy_perform(slot->curl);
1285 finish_active_slot(slot);
1286 }
1287#endif
1288}
1289
1290static void release_active_slot(struct active_request_slot *slot)
1291{
1292 closedown_active_slot(slot);
1293 if (slot->curl) {
1294 xmulti_remove_handle(slot);
1295 if (curl_session_count > min_curl_sessions) {
1296 curl_easy_cleanup(slot->curl);
1297 slot->curl = NULL;
1298 curl_session_count--;
1299 }
1300 }
1301#ifdef USE_CURL_MULTI
1302 fill_active_slots();
1303#endif
1304}
1305
1306void finish_all_active_slots(void)
1307{
1308 struct active_request_slot *slot = active_queue_head;
1309
1310 while (slot != NULL)
1311 if (slot->in_use) {
1312 run_active_slot(slot);
1313 slot = active_queue_head;
1314 } else {
1315 slot = slot->next;
1316 }
1317}
1318
1319/* Helpers for modifying and creating URLs */
1320static inline int needs_quote(int ch)
1321{
1322 if (((ch >= 'A') && (ch <= 'Z'))
1323 || ((ch >= 'a') && (ch <= 'z'))
1324 || ((ch >= '0') && (ch <= '9'))
1325 || (ch == '/')
1326 || (ch == '-')
1327 || (ch == '.'))
1328 return 0;
1329 return 1;
1330}
1331
1332static char *quote_ref_url(const char *base, const char *ref)
1333{
1334 struct strbuf buf = STRBUF_INIT;
1335 const char *cp;
1336 int ch;
1337
1338 end_url_with_slash(&buf, base);
1339
1340 for (cp = ref; (ch = *cp) != 0; cp++)
1341 if (needs_quote(ch))
1342 strbuf_addf(&buf, "%%%02x", ch);
1343 else
1344 strbuf_addch(&buf, *cp);
1345
1346 return strbuf_detach(&buf, NULL);
1347}
1348
1349void append_remote_object_url(struct strbuf *buf, const char *url,
1350 const char *hex,
1351 int only_two_digit_prefix)
1352{
1353 end_url_with_slash(buf, url);
1354
1355 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1356 if (!only_two_digit_prefix)
1357 strbuf_addstr(buf, hex + 2);
1358}
1359
1360char *get_remote_object_url(const char *url, const char *hex,
1361 int only_two_digit_prefix)
1362{
1363 struct strbuf buf = STRBUF_INIT;
1364 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1365 return strbuf_detach(&buf, NULL);
1366}
1367
1368static int handle_curl_result(struct slot_results *results)
1369{
1370 /*
1371 * If we see a failing http code with CURLE_OK, we have turned off
1372 * FAILONERROR (to keep the server's custom error response), and should
1373 * translate the code into failure here.
1374 *
1375 * Likewise, if we see a redirect (30x code), that means we turned off
1376 * redirect-following, and we should treat the result as an error.
1377 */
1378 if (results->curl_result == CURLE_OK &&
1379 results->http_code >= 300) {
1380 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1381 /*
1382 * Normally curl will already have put the "reason phrase"
1383 * from the server into curl_errorstr; unfortunately without
1384 * FAILONERROR it is lost, so we can give only the numeric
1385 * status code.
1386 */
1387 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1388 "The requested URL returned error: %ld",
1389 results->http_code);
1390 }
1391
1392 if (results->curl_result == CURLE_OK) {
1393 credential_approve(&http_auth);
1394 if (proxy_auth.password)
1395 credential_approve(&proxy_auth);
1396 return HTTP_OK;
1397 } else if (missing_target(results))
1398 return HTTP_MISSING_TARGET;
1399 else if (results->http_code == 401) {
1400 if (http_auth.username && http_auth.password) {
1401 credential_reject(&http_auth);
1402 return HTTP_NOAUTH;
1403 } else {
1404#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1405 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1406 if (results->auth_avail) {
1407 http_auth_methods &= results->auth_avail;
1408 http_auth_methods_restricted = 1;
1409 }
1410#endif
1411 return HTTP_REAUTH;
1412 }
1413 } else {
1414 if (results->http_connectcode == 407)
1415 credential_reject(&proxy_auth);
1416#if LIBCURL_VERSION_NUM >= 0x070c00
1417 if (!curl_errorstr[0])
1418 strlcpy(curl_errorstr,
1419 curl_easy_strerror(results->curl_result),
1420 sizeof(curl_errorstr));
1421#endif
1422 return HTTP_ERROR;
1423 }
1424}
1425
1426int run_one_slot(struct active_request_slot *slot,
1427 struct slot_results *results)
1428{
1429 slot->results = results;
1430 if (!start_active_slot(slot)) {
1431 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1432 "failed to start HTTP request");
1433 return HTTP_START_FAILED;
1434 }
1435
1436 run_active_slot(slot);
1437 return handle_curl_result(results);
1438}
1439
1440struct curl_slist *http_copy_default_headers(void)
1441{
1442 struct curl_slist *headers = NULL, *h;
1443
1444 for (h = extra_http_headers; h; h = h->next)
1445 headers = curl_slist_append(headers, h->data);
1446
1447 return headers;
1448}
1449
1450static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1451{
1452 char *ptr;
1453 CURLcode ret;
1454
1455 strbuf_reset(buf);
1456 ret = curl_easy_getinfo(curl, info, &ptr);
1457 if (!ret && ptr)
1458 strbuf_addstr(buf, ptr);
1459 return ret;
1460}
1461
1462/*
1463 * Check for and extract a content-type parameter. "raw"
1464 * should be positioned at the start of the potential
1465 * parameter, with any whitespace already removed.
1466 *
1467 * "name" is the name of the parameter. The value is appended
1468 * to "out".
1469 */
1470static int extract_param(const char *raw, const char *name,
1471 struct strbuf *out)
1472{
1473 size_t len = strlen(name);
1474
1475 if (strncasecmp(raw, name, len))
1476 return -1;
1477 raw += len;
1478
1479 if (*raw != '=')
1480 return -1;
1481 raw++;
1482
1483 while (*raw && !isspace(*raw) && *raw != ';')
1484 strbuf_addch(out, *raw++);
1485 return 0;
1486}
1487
1488/*
1489 * Extract a normalized version of the content type, with any
1490 * spaces suppressed, all letters lowercased, and no trailing ";"
1491 * or parameters.
1492 *
1493 * Note that we will silently remove even invalid whitespace. For
1494 * example, "text / plain" is specifically forbidden by RFC 2616,
1495 * but "text/plain" is the only reasonable output, and this keeps
1496 * our code simple.
1497 *
1498 * If the "charset" argument is not NULL, store the value of any
1499 * charset parameter there.
1500 *
1501 * Example:
1502 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1503 * "text / plain" -> "text/plain"
1504 */
1505static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1506 struct strbuf *charset)
1507{
1508 const char *p;
1509
1510 strbuf_reset(type);
1511 strbuf_grow(type, raw->len);
1512 for (p = raw->buf; *p; p++) {
1513 if (isspace(*p))
1514 continue;
1515 if (*p == ';') {
1516 p++;
1517 break;
1518 }
1519 strbuf_addch(type, tolower(*p));
1520 }
1521
1522 if (!charset)
1523 return;
1524
1525 strbuf_reset(charset);
1526 while (*p) {
1527 while (isspace(*p) || *p == ';')
1528 p++;
1529 if (!extract_param(p, "charset", charset))
1530 return;
1531 while (*p && !isspace(*p))
1532 p++;
1533 }
1534
1535 if (!charset->len && starts_with(type->buf, "text/"))
1536 strbuf_addstr(charset, "ISO-8859-1");
1537}
1538
1539static void write_accept_language(struct strbuf *buf)
1540{
1541 /*
1542 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1543 * that, q-value will be smaller than 0.001, the minimum q-value the
1544 * HTTP specification allows. See
1545 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1546 */
1547 const int MAX_DECIMAL_PLACES = 3;
1548 const int MAX_LANGUAGE_TAGS = 1000;
1549 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1550 char **language_tags = NULL;
1551 int num_langs = 0;
1552 const char *s = get_preferred_languages();
1553 int i;
1554 struct strbuf tag = STRBUF_INIT;
1555
1556 /* Don't add Accept-Language header if no language is preferred. */
1557 if (!s)
1558 return;
1559
1560 /*
1561 * Split the colon-separated string of preferred languages into
1562 * language_tags array.
1563 */
1564 do {
1565 /* collect language tag */
1566 for (; *s && (isalnum(*s) || *s == '_'); s++)
1567 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1568
1569 /* skip .codeset, @modifier and any other unnecessary parts */
1570 while (*s && *s != ':')
1571 s++;
1572
1573 if (tag.len) {
1574 num_langs++;
1575 REALLOC_ARRAY(language_tags, num_langs);
1576 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1577 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1578 break;
1579 }
1580 } while (*s++);
1581
1582 /* write Accept-Language header into buf */
1583 if (num_langs) {
1584 int last_buf_len = 0;
1585 int max_q;
1586 int decimal_places;
1587 char q_format[32];
1588
1589 /* add '*' */
1590 REALLOC_ARRAY(language_tags, num_langs + 1);
1591 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1592
1593 /* compute decimal_places */
1594 for (max_q = 1, decimal_places = 0;
1595 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1596 decimal_places++, max_q *= 10)
1597 ;
1598
1599 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1600
1601 strbuf_addstr(buf, "Accept-Language: ");
1602
1603 for (i = 0; i < num_langs; i++) {
1604 if (i > 0)
1605 strbuf_addstr(buf, ", ");
1606
1607 strbuf_addstr(buf, language_tags[i]);
1608
1609 if (i > 0)
1610 strbuf_addf(buf, q_format, max_q - i);
1611
1612 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1613 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1614 break;
1615 }
1616
1617 last_buf_len = buf->len;
1618 }
1619 }
1620
1621 /* free language tags -- last one is a static '*' */
1622 for (i = 0; i < num_langs - 1; i++)
1623 free(language_tags[i]);
1624 free(language_tags);
1625}
1626
1627/*
1628 * Get an Accept-Language header which indicates user's preferred languages.
1629 *
1630 * Examples:
1631 * LANGUAGE= -> ""
1632 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1633 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1634 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1635 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1636 * LANGUAGE= LANG=C -> ""
1637 */
1638static const char *get_accept_language(void)
1639{
1640 if (!cached_accept_language) {
1641 struct strbuf buf = STRBUF_INIT;
1642 write_accept_language(&buf);
1643 if (buf.len > 0)
1644 cached_accept_language = strbuf_detach(&buf, NULL);
1645 }
1646
1647 return cached_accept_language;
1648}
1649
1650static void http_opt_request_remainder(CURL *curl, off_t pos)
1651{
1652 char buf[128];
1653 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1654 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1655}
1656
1657/* http_request() targets */
1658#define HTTP_REQUEST_STRBUF 0
1659#define HTTP_REQUEST_FILE 1
1660
1661static int http_request(const char *url,
1662 void *result, int target,
1663 const struct http_get_options *options)
1664{
1665 struct active_request_slot *slot;
1666 struct slot_results results;
1667 struct curl_slist *headers = http_copy_default_headers();
1668 struct strbuf buf = STRBUF_INIT;
1669 const char *accept_language;
1670 int ret;
1671
1672 slot = get_active_slot();
1673 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1674
1675 if (result == NULL) {
1676 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1677 } else {
1678 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1679 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1680
1681 if (target == HTTP_REQUEST_FILE) {
1682 off_t posn = ftello(result);
1683 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1684 fwrite);
1685 if (posn > 0)
1686 http_opt_request_remainder(slot->curl, posn);
1687 } else
1688 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1689 fwrite_buffer);
1690 }
1691
1692 accept_language = get_accept_language();
1693
1694 if (accept_language)
1695 headers = curl_slist_append(headers, accept_language);
1696
1697 strbuf_addstr(&buf, "Pragma:");
1698 if (options && options->no_cache)
1699 strbuf_addstr(&buf, " no-cache");
1700 if (options && options->keep_error)
1701 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1702 if (options && options->initial_request &&
1703 http_follow_config == HTTP_FOLLOW_INITIAL)
1704 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1705
1706 headers = curl_slist_append(headers, buf.buf);
1707
1708 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1709 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1710 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1711
1712 ret = run_one_slot(slot, &results);
1713
1714 if (options && options->content_type) {
1715 struct strbuf raw = STRBUF_INIT;
1716 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1717 extract_content_type(&raw, options->content_type,
1718 options->charset);
1719 strbuf_release(&raw);
1720 }
1721
1722 if (options && options->effective_url)
1723 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1724 options->effective_url);
1725
1726 curl_slist_free_all(headers);
1727 strbuf_release(&buf);
1728
1729 return ret;
1730}
1731
1732/*
1733 * Update the "base" url to a more appropriate value, as deduced by
1734 * redirects seen when requesting a URL starting with "url".
1735 *
1736 * The "asked" parameter is a URL that we asked curl to access, and must begin
1737 * with "base".
1738 *
1739 * The "got" parameter is the URL that curl reported to us as where we ended
1740 * up.
1741 *
1742 * Returns 1 if we updated the base url, 0 otherwise.
1743 *
1744 * Our basic strategy is to compare "base" and "asked" to find the bits
1745 * specific to our request. We then strip those bits off of "got" to yield the
1746 * new base. So for example, if our base is "http://example.com/foo.git",
1747 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1748 * with "https://other.example.com/foo.git/info/refs". We would want the
1749 * new URL to become "https://other.example.com/foo.git".
1750 *
1751 * Note that this assumes a sane redirect scheme. It's entirely possible
1752 * in the example above to end up at a URL that does not even end in
1753 * "info/refs". In such a case we die. There's not much we can do, such a
1754 * scheme is unlikely to represent a real git repository, and failing to
1755 * rewrite the base opens options for malicious redirects to do funny things.
1756 */
1757static int update_url_from_redirect(struct strbuf *base,
1758 const char *asked,
1759 const struct strbuf *got)
1760{
1761 const char *tail;
1762 size_t new_len;
1763
1764 if (!strcmp(asked, got->buf))
1765 return 0;
1766
1767 if (!skip_prefix(asked, base->buf, &tail))
1768 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1769 asked, base->buf);
1770
1771 new_len = got->len;
1772 if (!strip_suffix_mem(got->buf, &new_len, tail))
1773 die(_("unable to update url base from redirection:\n"
1774 " asked for: %s\n"
1775 " redirect: %s"),
1776 asked, got->buf);
1777
1778 strbuf_reset(base);
1779 strbuf_add(base, got->buf, new_len);
1780
1781 return 1;
1782}
1783
1784static int http_request_reauth(const char *url,
1785 void *result, int target,
1786 struct http_get_options *options)
1787{
1788 int ret = http_request(url, result, target, options);
1789
1790 if (ret != HTTP_OK && ret != HTTP_REAUTH)
1791 return ret;
1792
1793 if (options && options->effective_url && options->base_url) {
1794 if (update_url_from_redirect(options->base_url,
1795 url, options->effective_url)) {
1796 credential_from_url(&http_auth, options->base_url->buf);
1797 url = options->effective_url->buf;
1798 }
1799 }
1800
1801 if (ret != HTTP_REAUTH)
1802 return ret;
1803
1804 /*
1805 * If we are using KEEP_ERROR, the previous request may have
1806 * put cruft into our output stream; we should clear it out before
1807 * making our next request. We only know how to do this for
1808 * the strbuf case, but that is enough to satisfy current callers.
1809 */
1810 if (options && options->keep_error) {
1811 switch (target) {
1812 case HTTP_REQUEST_STRBUF:
1813 strbuf_reset(result);
1814 break;
1815 default:
1816 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1817 }
1818 }
1819
1820 credential_fill(&http_auth);
1821
1822 return http_request(url, result, target, options);
1823}
1824
1825int http_get_strbuf(const char *url,
1826 struct strbuf *result,
1827 struct http_get_options *options)
1828{
1829 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1830}
1831
1832/*
1833 * Downloads a URL and stores the result in the given file.
1834 *
1835 * If a previous interrupted download is detected (i.e. a previous temporary
1836 * file is still around) the download is resumed.
1837 */
1838static int http_get_file(const char *url, const char *filename,
1839 struct http_get_options *options)
1840{
1841 int ret;
1842 struct strbuf tmpfile = STRBUF_INIT;
1843 FILE *result;
1844
1845 strbuf_addf(&tmpfile, "%s.temp", filename);
1846 result = fopen(tmpfile.buf, "a");
1847 if (!result) {
1848 error("Unable to open local file %s", tmpfile.buf);
1849 ret = HTTP_ERROR;
1850 goto cleanup;
1851 }
1852
1853 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1854 fclose(result);
1855
1856 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1857 ret = HTTP_ERROR;
1858cleanup:
1859 strbuf_release(&tmpfile);
1860 return ret;
1861}
1862
1863int http_fetch_ref(const char *base, struct ref *ref)
1864{
1865 struct http_get_options options = {0};
1866 char *url;
1867 struct strbuf buffer = STRBUF_INIT;
1868 int ret = -1;
1869
1870 options.no_cache = 1;
1871
1872 url = quote_ref_url(base, ref->name);
1873 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1874 strbuf_rtrim(&buffer);
1875 if (buffer.len == 40)
1876 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1877 else if (starts_with(buffer.buf, "ref: ")) {
1878 ref->symref = xstrdup(buffer.buf + 5);
1879 ret = 0;
1880 }
1881 }
1882
1883 strbuf_release(&buffer);
1884 free(url);
1885 return ret;
1886}
1887
1888/* Helpers for fetching packs */
1889static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1890{
1891 char *url, *tmp;
1892 struct strbuf buf = STRBUF_INIT;
1893
1894 if (http_is_verbose)
1895 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1896
1897 end_url_with_slash(&buf, base_url);
1898 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1899 url = strbuf_detach(&buf, NULL);
1900
1901 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1902 tmp = strbuf_detach(&buf, NULL);
1903
1904 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1905 error("Unable to get pack index %s", url);
1906 FREE_AND_NULL(tmp);
1907 }
1908
1909 free(url);
1910 return tmp;
1911}
1912
1913static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1914 unsigned char *sha1, const char *base_url)
1915{
1916 struct packed_git *new_pack;
1917 char *tmp_idx = NULL;
1918 int ret;
1919
1920 if (has_pack_index(sha1)) {
1921 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1922 if (!new_pack)
1923 return -1; /* parse_pack_index() already issued error message */
1924 goto add_pack;
1925 }
1926
1927 tmp_idx = fetch_pack_index(sha1, base_url);
1928 if (!tmp_idx)
1929 return -1;
1930
1931 new_pack = parse_pack_index(sha1, tmp_idx);
1932 if (!new_pack) {
1933 unlink(tmp_idx);
1934 free(tmp_idx);
1935
1936 return -1; /* parse_pack_index() already issued error message */
1937 }
1938
1939 ret = verify_pack_index(new_pack);
1940 if (!ret) {
1941 close_pack_index(new_pack);
1942 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1943 }
1944 free(tmp_idx);
1945 if (ret)
1946 return -1;
1947
1948add_pack:
1949 new_pack->next = *packs_head;
1950 *packs_head = new_pack;
1951 return 0;
1952}
1953
1954int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1955{
1956 struct http_get_options options = {0};
1957 int ret = 0, i = 0;
1958 char *url, *data;
1959 struct strbuf buf = STRBUF_INIT;
1960 unsigned char sha1[20];
1961
1962 end_url_with_slash(&buf, base_url);
1963 strbuf_addstr(&buf, "objects/info/packs");
1964 url = strbuf_detach(&buf, NULL);
1965
1966 options.no_cache = 1;
1967 ret = http_get_strbuf(url, &buf, &options);
1968 if (ret != HTTP_OK)
1969 goto cleanup;
1970
1971 data = buf.buf;
1972 while (i < buf.len) {
1973 switch (data[i]) {
1974 case 'P':
1975 i++;
1976 if (i + 52 <= buf.len &&
1977 starts_with(data + i, " pack-") &&
1978 starts_with(data + i + 46, ".pack\n")) {
1979 get_sha1_hex(data + i + 6, sha1);
1980 fetch_and_setup_pack_index(packs_head, sha1,
1981 base_url);
1982 i += 51;
1983 break;
1984 }
1985 default:
1986 while (i < buf.len && data[i] != '\n')
1987 i++;
1988 }
1989 i++;
1990 }
1991
1992cleanup:
1993 free(url);
1994 return ret;
1995}
1996
1997void release_http_pack_request(struct http_pack_request *preq)
1998{
1999 if (preq->packfile != NULL) {
2000 fclose(preq->packfile);
2001 preq->packfile = NULL;
2002 }
2003 preq->slot = NULL;
2004 free(preq->url);
2005 free(preq);
2006}
2007
2008int finish_http_pack_request(struct http_pack_request *preq)
2009{
2010 struct packed_git **lst;
2011 struct packed_git *p = preq->target;
2012 char *tmp_idx;
2013 size_t len;
2014 struct child_process ip = CHILD_PROCESS_INIT;
2015 const char *ip_argv[8];
2016
2017 close_pack_index(p);
2018
2019 fclose(preq->packfile);
2020 preq->packfile = NULL;
2021
2022 lst = preq->lst;
2023 while (*lst != p)
2024 lst = &((*lst)->next);
2025 *lst = (*lst)->next;
2026
2027 if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
2028 die("BUG: pack tmpfile does not end in .pack.temp?");
2029 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
2030
2031 ip_argv[0] = "index-pack";
2032 ip_argv[1] = "-o";
2033 ip_argv[2] = tmp_idx;
2034 ip_argv[3] = preq->tmpfile;
2035 ip_argv[4] = NULL;
2036
2037 ip.argv = ip_argv;
2038 ip.git_cmd = 1;
2039 ip.no_stdin = 1;
2040 ip.no_stdout = 1;
2041
2042 if (run_command(&ip)) {
2043 unlink(preq->tmpfile);
2044 unlink(tmp_idx);
2045 free(tmp_idx);
2046 return -1;
2047 }
2048
2049 unlink(sha1_pack_index_name(p->sha1));
2050
2051 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
2052 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
2053 free(tmp_idx);
2054 return -1;
2055 }
2056
2057 install_packed_git(p);
2058 free(tmp_idx);
2059 return 0;
2060}
2061
2062struct http_pack_request *new_http_pack_request(
2063 struct packed_git *target, const char *base_url)
2064{
2065 off_t prev_posn = 0;
2066 struct strbuf buf = STRBUF_INIT;
2067 struct http_pack_request *preq;
2068
2069 preq = xcalloc(1, sizeof(*preq));
2070 preq->target = target;
2071
2072 end_url_with_slash(&buf, base_url);
2073 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2074 sha1_to_hex(target->sha1));
2075 preq->url = strbuf_detach(&buf, NULL);
2076
2077 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
2078 sha1_pack_name(target->sha1));
2079 preq->packfile = fopen(preq->tmpfile, "a");
2080 if (!preq->packfile) {
2081 error("Unable to open local file %s for pack",
2082 preq->tmpfile);
2083 goto abort;
2084 }
2085
2086 preq->slot = get_active_slot();
2087 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2088 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2089 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2090 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2091 no_pragma_header);
2092
2093 /*
2094 * If there is data present from a previous transfer attempt,
2095 * resume where it left off
2096 */
2097 prev_posn = ftello(preq->packfile);
2098 if (prev_posn>0) {
2099 if (http_is_verbose)
2100 fprintf(stderr,
2101 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2102 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
2103 http_opt_request_remainder(preq->slot->curl, prev_posn);
2104 }
2105
2106 return preq;
2107
2108abort:
2109 free(preq->url);
2110 free(preq);
2111 return NULL;
2112}
2113
2114/* Helpers for fetching objects (loose) */
2115static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2116 void *data)
2117{
2118 unsigned char expn[4096];
2119 size_t size = eltsize * nmemb;
2120 int posn = 0;
2121 struct http_object_request *freq = data;
2122 struct active_request_slot *slot = freq->slot;
2123
2124 if (slot) {
2125 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2126 &slot->http_code);
2127 if (c != CURLE_OK)
2128 die("BUG: curl_easy_getinfo for HTTP code failed: %s",
2129 curl_easy_strerror(c));
2130 if (slot->http_code >= 300)
2131 return size;
2132 }
2133
2134 do {
2135 ssize_t retval = xwrite(freq->localfile,
2136 (char *) ptr + posn, size - posn);
2137 if (retval < 0)
2138 return posn;
2139 posn += retval;
2140 } while (posn < size);
2141
2142 freq->stream.avail_in = size;
2143 freq->stream.next_in = (void *)ptr;
2144 do {
2145 freq->stream.next_out = expn;
2146 freq->stream.avail_out = sizeof(expn);
2147 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2148 git_SHA1_Update(&freq->c, expn,
2149 sizeof(expn) - freq->stream.avail_out);
2150 } while (freq->stream.avail_in && freq->zret == Z_OK);
2151 return size;
2152}
2153
2154struct http_object_request *new_http_object_request(const char *base_url,
2155 unsigned char *sha1)
2156{
2157 char *hex = sha1_to_hex(sha1);
2158 const char *filename;
2159 char prevfile[PATH_MAX];
2160 int prevlocal;
2161 char prev_buf[PREV_BUF_SIZE];
2162 ssize_t prev_read = 0;
2163 off_t prev_posn = 0;
2164 struct http_object_request *freq;
2165
2166 freq = xcalloc(1, sizeof(*freq));
2167 hashcpy(freq->sha1, sha1);
2168 freq->localfile = -1;
2169
2170 filename = sha1_file_name(sha1);
2171 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2172 "%s.temp", filename);
2173
2174 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
2175 unlink_or_warn(prevfile);
2176 rename(freq->tmpfile, prevfile);
2177 unlink_or_warn(freq->tmpfile);
2178
2179 if (freq->localfile != -1)
2180 error("fd leakage in start: %d", freq->localfile);
2181 freq->localfile = open(freq->tmpfile,
2182 O_WRONLY | O_CREAT | O_EXCL, 0666);
2183 /*
2184 * This could have failed due to the "lazy directory creation";
2185 * try to mkdir the last path component.
2186 */
2187 if (freq->localfile < 0 && errno == ENOENT) {
2188 char *dir = strrchr(freq->tmpfile, '/');
2189 if (dir) {
2190 *dir = 0;
2191 mkdir(freq->tmpfile, 0777);
2192 *dir = '/';
2193 }
2194 freq->localfile = open(freq->tmpfile,
2195 O_WRONLY | O_CREAT | O_EXCL, 0666);
2196 }
2197
2198 if (freq->localfile < 0) {
2199 error_errno("Couldn't create temporary file %s", freq->tmpfile);
2200 goto abort;
2201 }
2202
2203 git_inflate_init(&freq->stream);
2204
2205 git_SHA1_Init(&freq->c);
2206
2207 freq->url = get_remote_object_url(base_url, hex, 0);
2208
2209 /*
2210 * If a previous temp file is present, process what was already
2211 * fetched.
2212 */
2213 prevlocal = open(prevfile, O_RDONLY);
2214 if (prevlocal != -1) {
2215 do {
2216 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2217 if (prev_read>0) {
2218 if (fwrite_sha1_file(prev_buf,
2219 1,
2220 prev_read,
2221 freq) == prev_read) {
2222 prev_posn += prev_read;
2223 } else {
2224 prev_read = -1;
2225 }
2226 }
2227 } while (prev_read > 0);
2228 close(prevlocal);
2229 }
2230 unlink_or_warn(prevfile);
2231
2232 /*
2233 * Reset inflate/SHA1 if there was an error reading the previous temp
2234 * file; also rewind to the beginning of the local file.
2235 */
2236 if (prev_read == -1) {
2237 memset(&freq->stream, 0, sizeof(freq->stream));
2238 git_inflate_init(&freq->stream);
2239 git_SHA1_Init(&freq->c);
2240 if (prev_posn>0) {
2241 prev_posn = 0;
2242 lseek(freq->localfile, 0, SEEK_SET);
2243 if (ftruncate(freq->localfile, 0) < 0) {
2244 error_errno("Couldn't truncate temporary file %s",
2245 freq->tmpfile);
2246 goto abort;
2247 }
2248 }
2249 }
2250
2251 freq->slot = get_active_slot();
2252
2253 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2254 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2255 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2256 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2257 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2258 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2259
2260 /*
2261 * If we have successfully processed data from a previous fetch
2262 * attempt, only fetch the data we don't already have.
2263 */
2264 if (prev_posn>0) {
2265 if (http_is_verbose)
2266 fprintf(stderr,
2267 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2268 hex, (uintmax_t)prev_posn);
2269 http_opt_request_remainder(freq->slot->curl, prev_posn);
2270 }
2271
2272 return freq;
2273
2274abort:
2275 free(freq->url);
2276 free(freq);
2277 return NULL;
2278}
2279
2280void process_http_object_request(struct http_object_request *freq)
2281{
2282 if (freq->slot == NULL)
2283 return;
2284 freq->curl_result = freq->slot->curl_result;
2285 freq->http_code = freq->slot->http_code;
2286 freq->slot = NULL;
2287}
2288
2289int finish_http_object_request(struct http_object_request *freq)
2290{
2291 struct stat st;
2292
2293 close(freq->localfile);
2294 freq->localfile = -1;
2295
2296 process_http_object_request(freq);
2297
2298 if (freq->http_code == 416) {
2299 warning("requested range invalid; we may already have all the data.");
2300 } else if (freq->curl_result != CURLE_OK) {
2301 if (stat(freq->tmpfile, &st) == 0)
2302 if (st.st_size == 0)
2303 unlink_or_warn(freq->tmpfile);
2304 return -1;
2305 }
2306
2307 git_inflate_end(&freq->stream);
2308 git_SHA1_Final(freq->real_sha1, &freq->c);
2309 if (freq->zret != Z_STREAM_END) {
2310 unlink_or_warn(freq->tmpfile);
2311 return -1;
2312 }
2313 if (hashcmp(freq->sha1, freq->real_sha1)) {
2314 unlink_or_warn(freq->tmpfile);
2315 return -1;
2316 }
2317 freq->rename =
2318 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2319
2320 return freq->rename;
2321}
2322
2323void abort_http_object_request(struct http_object_request *freq)
2324{
2325 unlink_or_warn(freq->tmpfile);
2326
2327 release_http_object_request(freq);
2328}
2329
2330void release_http_object_request(struct http_object_request *freq)
2331{
2332 if (freq->localfile != -1) {
2333 close(freq->localfile);
2334 freq->localfile = -1;
2335 }
2336 if (freq->url != NULL) {
2337 FREE_AND_NULL(freq->url);
2338 }
2339 if (freq->slot != NULL) {
2340 freq->slot->callback_func = NULL;
2341 freq->slot->callback_data = NULL;
2342 release_active_slot(freq->slot);
2343 freq->slot = NULL;
2344 }
2345}