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partial-clone: render design doc using asciidoc
[git.git] / http.c
blob215bebef1bfb935355a765027fc8605fccbc3d1b
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 #include "protocol.h"
16
17 static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
18 #if LIBCURL_VERSION_NUM >= 0x070a08
19 long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
20 #else
21 long int git_curl_ipresolve;
22 #endif
23 int active_requests;
24 int http_is_verbose;
25 ssize_t http_post_buffer = 16 * LARGE_PACKET_MAX;
26
27 #if LIBCURL_VERSION_NUM >= 0x070a06
28 #define LIBCURL_CAN_HANDLE_AUTH_ANY
29 #endif
30
31 static int min_curl_sessions = 1;
32 static int curl_session_count;
33 #ifdef USE_CURL_MULTI
34 static int max_requests = -1;
35 static CURLM *curlm;
36 #endif
37 #ifndef NO_CURL_EASY_DUPHANDLE
38 static CURL *curl_default;
39 #endif
40
41 #define PREV_BUF_SIZE 4096
42
43 char curl_errorstr[CURL_ERROR_SIZE];
44
45 static int curl_ssl_verify = -1;
46 static int curl_ssl_try;
47 static const char *ssl_cert;
48 static const char *ssl_cipherlist;
49 static const char *ssl_version;
50 static struct {
51 const char *name;
52 long ssl_version;
53 } sslversions[] = {
54 { "sslv2", CURL_SSLVERSION_SSLv2 },
55 { "sslv3", CURL_SSLVERSION_SSLv3 },
56 { "tlsv1", CURL_SSLVERSION_TLSv1 },
57 #if LIBCURL_VERSION_NUM >= 0x072200
58 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
59 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
60 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
61 #endif
62 };
63 #if LIBCURL_VERSION_NUM >= 0x070903
64 static const char *ssl_key;
65 #endif
66 #if LIBCURL_VERSION_NUM >= 0x070908
67 static const char *ssl_capath;
68 #endif
69 #if LIBCURL_VERSION_NUM >= 0x072c00
70 static const char *ssl_pinnedkey;
71 #endif
72 static const char *ssl_cainfo;
73 static long curl_low_speed_limit = -1;
74 static long curl_low_speed_time = -1;
75 static int curl_ftp_no_epsv;
76 static const char *curl_http_proxy;
77 static const char *curl_no_proxy;
78 static const char *http_proxy_authmethod;
79 static struct {
80 const char *name;
81 long curlauth_param;
82 } proxy_authmethods[] = {
83 { "basic", CURLAUTH_BASIC },
84 { "digest", CURLAUTH_DIGEST },
85 { "negotiate", CURLAUTH_GSSNEGOTIATE },
86 { "ntlm", CURLAUTH_NTLM },
87 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
88 { "anyauth", CURLAUTH_ANY },
89 #endif
90 /*
91 * CURLAUTH_DIGEST_IE has no corresponding command-line option in
92 * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
93 * here, too
94 */
95 };
96 #ifdef CURLGSSAPI_DELEGATION_FLAG
97 static const char *curl_deleg;
98 static struct {
99 const char *name;
100 long curl_deleg_param;
101 } curl_deleg_levels[] = {
102 { "none", CURLGSSAPI_DELEGATION_NONE },
103 { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
104 { "always", CURLGSSAPI_DELEGATION_FLAG },
105 };
106 #endif
107
108 static struct credential proxy_auth = CREDENTIAL_INIT;
109 static const char *curl_proxyuserpwd;
110 static const char *curl_cookie_file;
111 static int curl_save_cookies;
112 struct credential http_auth = CREDENTIAL_INIT;
113 static int http_proactive_auth;
114 static const char *user_agent;
115 static int curl_empty_auth = -1;
116
117 enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
118
119 #if LIBCURL_VERSION_NUM >= 0x071700
120 /* Use CURLOPT_KEYPASSWD as is */
121 #elif LIBCURL_VERSION_NUM >= 0x070903
122 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
123 #else
124 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
125 #endif
126
127 static struct credential cert_auth = CREDENTIAL_INIT;
128 static int ssl_cert_password_required;
129 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
130 static unsigned long http_auth_methods = CURLAUTH_ANY;
131 static int http_auth_methods_restricted;
132 /* Modes for which empty_auth cannot actually help us. */
133 static unsigned long empty_auth_useless =
134 CURLAUTH_BASIC
135 #ifdef CURLAUTH_DIGEST_IE
136 | CURLAUTH_DIGEST_IE
137 #endif
138 | CURLAUTH_DIGEST;
139 #endif
140
141 static struct curl_slist *pragma_header;
142 static struct curl_slist *no_pragma_header;
143 static struct curl_slist *extra_http_headers;
144
145 static struct active_request_slot *active_queue_head;
146
147 static char *cached_accept_language;
148
149 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
150 {
151 size_t size = eltsize * nmemb;
152 struct buffer *buffer = buffer_;
153
154 if (size > buffer->buf.len - buffer->posn)
155 size = buffer->buf.len - buffer->posn;
156 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
157 buffer->posn += size;
158
159 return size;
160 }
161
162 #ifndef NO_CURL_IOCTL
163 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
164 {
165 struct buffer *buffer = clientp;
166
167 switch (cmd) {
168 case CURLIOCMD_NOP:
169 return CURLIOE_OK;
170
171 case CURLIOCMD_RESTARTREAD:
172 buffer->posn = 0;
173 return CURLIOE_OK;
174
175 default:
176 return CURLIOE_UNKNOWNCMD;
177 }
178 }
179 #endif
180
181 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
182 {
183 size_t size = eltsize * nmemb;
184 struct strbuf *buffer = buffer_;
185
186 strbuf_add(buffer, ptr, size);
187 return size;
188 }
189
190 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
191 {
192 return eltsize * nmemb;
193 }
194
195 static void closedown_active_slot(struct active_request_slot *slot)
196 {
197 active_requests--;
198 slot->in_use = 0;
199 }
200
201 static void finish_active_slot(struct active_request_slot *slot)
202 {
203 closedown_active_slot(slot);
204 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
205
206 if (slot->finished != NULL)
207 (*slot->finished) = 1;
208
209 /* Store slot results so they can be read after the slot is reused */
210 if (slot->results != NULL) {
211 slot->results->curl_result = slot->curl_result;
212 slot->results->http_code = slot->http_code;
213 #if LIBCURL_VERSION_NUM >= 0x070a08
214 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
215 &slot->results->auth_avail);
216 #else
217 slot->results->auth_avail = 0;
218 #endif
219
220 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
221 &slot->results->http_connectcode);
222 }
223
224 /* Run callback if appropriate */
225 if (slot->callback_func != NULL)
226 slot->callback_func(slot->callback_data);
227 }
228
229 static void xmulti_remove_handle(struct active_request_slot *slot)
230 {
231 #ifdef USE_CURL_MULTI
232 curl_multi_remove_handle(curlm, slot->curl);
233 #endif
234 }
235
236 #ifdef USE_CURL_MULTI
237 static void process_curl_messages(void)
238 {
239 int num_messages;
240 struct active_request_slot *slot;
241 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
242
243 while (curl_message != NULL) {
244 if (curl_message->msg == CURLMSG_DONE) {
245 int curl_result = curl_message->data.result;
246 slot = active_queue_head;
247 while (slot != NULL &&
248 slot->curl != curl_message->easy_handle)
249 slot = slot->next;
250 if (slot != NULL) {
251 xmulti_remove_handle(slot);
252 slot->curl_result = curl_result;
253 finish_active_slot(slot);
254 } else {
255 fprintf(stderr, "Received DONE message for unknown request!\n");
256 }
257 } else {
258 fprintf(stderr, "Unknown CURL message received: %d\n",
259 (int)curl_message->msg);
260 }
261 curl_message = curl_multi_info_read(curlm, &num_messages);
262 }
263 }
264 #endif
265
266 static int http_options(const char *var, const char *value, void *cb)
267 {
268 if (!strcmp("http.sslverify", var)) {
269 curl_ssl_verify = git_config_bool(var, value);
270 return 0;
271 }
272 if (!strcmp("http.sslcipherlist", var))
273 return git_config_string(&ssl_cipherlist, var, value);
274 if (!strcmp("http.sslversion", var))
275 return git_config_string(&ssl_version, var, value);
276 if (!strcmp("http.sslcert", var))
277 return git_config_pathname(&ssl_cert, var, value);
278 #if LIBCURL_VERSION_NUM >= 0x070903
279 if (!strcmp("http.sslkey", var))
280 return git_config_pathname(&ssl_key, var, value);
281 #endif
282 #if LIBCURL_VERSION_NUM >= 0x070908
283 if (!strcmp("http.sslcapath", var))
284 return git_config_pathname(&ssl_capath, var, value);
285 #endif
286 if (!strcmp("http.sslcainfo", var))
287 return git_config_pathname(&ssl_cainfo, var, value);
288 if (!strcmp("http.sslcertpasswordprotected", var)) {
289 ssl_cert_password_required = git_config_bool(var, value);
290 return 0;
291 }
292 if (!strcmp("http.ssltry", var)) {
293 curl_ssl_try = git_config_bool(var, value);
294 return 0;
295 }
296 if (!strcmp("http.minsessions", var)) {
297 min_curl_sessions = git_config_int(var, value);
298 #ifndef USE_CURL_MULTI
299 if (min_curl_sessions > 1)
300 min_curl_sessions = 1;
301 #endif
302 return 0;
303 }
304 #ifdef USE_CURL_MULTI
305 if (!strcmp("http.maxrequests", var)) {
306 max_requests = git_config_int(var, value);
307 return 0;
308 }
309 #endif
310 if (!strcmp("http.lowspeedlimit", var)) {
311 curl_low_speed_limit = (long)git_config_int(var, value);
312 return 0;
313 }
314 if (!strcmp("http.lowspeedtime", var)) {
315 curl_low_speed_time = (long)git_config_int(var, value);
316 return 0;
317 }
318
319 if (!strcmp("http.noepsv", var)) {
320 curl_ftp_no_epsv = git_config_bool(var, value);
321 return 0;
322 }
323 if (!strcmp("http.proxy", var))
324 return git_config_string(&curl_http_proxy, var, value);
325
326 if (!strcmp("http.proxyauthmethod", var))
327 return git_config_string(&http_proxy_authmethod, var, value);
328
329 if (!strcmp("http.cookiefile", var))
330 return git_config_pathname(&curl_cookie_file, var, value);
331 if (!strcmp("http.savecookies", var)) {
332 curl_save_cookies = git_config_bool(var, value);
333 return 0;
334 }
335
336 if (!strcmp("http.postbuffer", var)) {
337 http_post_buffer = git_config_ssize_t(var, value);
338 if (http_post_buffer < 0)
339 warning(_("negative value for http.postbuffer; defaulting to %d"), LARGE_PACKET_MAX);
340 if (http_post_buffer < LARGE_PACKET_MAX)
341 http_post_buffer = LARGE_PACKET_MAX;
342 return 0;
343 }
344
345 if (!strcmp("http.useragent", var))
346 return git_config_string(&user_agent, var, value);
347
348 if (!strcmp("http.emptyauth", var)) {
349 if (value && !strcmp("auto", value))
350 curl_empty_auth = -1;
351 else
352 curl_empty_auth = git_config_bool(var, value);
353 return 0;
354 }
355
356 if (!strcmp("http.delegation", var)) {
357 #ifdef CURLGSSAPI_DELEGATION_FLAG
358 return git_config_string(&curl_deleg, var, value);
359 #else
360 warning(_("Delegation control is not supported with cURL < 7.22.0"));
361 return 0;
362 #endif
363 }
364
365 if (!strcmp("http.pinnedpubkey", var)) {
366 #if LIBCURL_VERSION_NUM >= 0x072c00
367 return git_config_pathname(&ssl_pinnedkey, var, value);
368 #else
369 warning(_("Public key pinning not supported with cURL < 7.44.0"));
370 return 0;
371 #endif
372 }
373
374 if (!strcmp("http.extraheader", var)) {
375 if (!value) {
376 return config_error_nonbool(var);
377 } else if (!*value) {
378 curl_slist_free_all(extra_http_headers);
379 extra_http_headers = NULL;
380 } else {
381 extra_http_headers =
382 curl_slist_append(extra_http_headers, value);
383 }
384 return 0;
385 }
386
387 if (!strcmp("http.followredirects", var)) {
388 if (value && !strcmp(value, "initial"))
389 http_follow_config = HTTP_FOLLOW_INITIAL;
390 else if (git_config_bool(var, value))
391 http_follow_config = HTTP_FOLLOW_ALWAYS;
392 else
393 http_follow_config = HTTP_FOLLOW_NONE;
394 return 0;
395 }
396
397 /* Fall back on the default ones */
398 return git_default_config(var, value, cb);
399 }
400
401 static int curl_empty_auth_enabled(void)
402 {
403 if (curl_empty_auth >= 0)
404 return curl_empty_auth;
405
406 #ifndef LIBCURL_CAN_HANDLE_AUTH_ANY
407 /*
408 * Our libcurl is too old to do AUTH_ANY in the first place;
409 * just default to turning the feature off.
410 */
411 #else
412 /*
413 * In the automatic case, kick in the empty-auth
414 * hack as long as we would potentially try some
415 * method more exotic than "Basic" or "Digest".
416 *
417 * But only do this when this is our second or
418 * subsequent request, as by then we know what
419 * methods are available.
420 */
421 if (http_auth_methods_restricted &&
422 (http_auth_methods & ~empty_auth_useless))
423 return 1;
424 #endif
425 return 0;
426 }
427
428 static void init_curl_http_auth(CURL *result)
429 {
430 if (!http_auth.username || !*http_auth.username) {
431 if (curl_empty_auth_enabled())
432 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
433 return;
434 }
435
436 credential_fill(&http_auth);
437
438 #if LIBCURL_VERSION_NUM >= 0x071301
439 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
440 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
441 #else
442 {
443 static struct strbuf up = STRBUF_INIT;
444 /*
445 * Note that we assume we only ever have a single set of
446 * credentials in a given program run, so we do not have
447 * to worry about updating this buffer, only setting its
448 * initial value.
449 */
450 if (!up.len)
451 strbuf_addf(&up, "%s:%s",
452 http_auth.username, http_auth.password);
453 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
454 }
455 #endif
456 }
457
458 /* *var must be free-able */
459 static void var_override(const char **var, char *value)
460 {
461 if (value) {
462 free((void *)*var);
463 *var = xstrdup(value);
464 }
465 }
466
467 static void set_proxyauth_name_password(CURL *result)
468 {
469 #if LIBCURL_VERSION_NUM >= 0x071301
470 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
471 proxy_auth.username);
472 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
473 proxy_auth.password);
474 #else
475 struct strbuf s = STRBUF_INIT;
476
477 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
478 strbuf_addch(&s, ':');
479 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
480 curl_proxyuserpwd = strbuf_detach(&s, NULL);
481 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
482 #endif
483 }
484
485 static void init_curl_proxy_auth(CURL *result)
486 {
487 if (proxy_auth.username) {
488 if (!proxy_auth.password)
489 credential_fill(&proxy_auth);
490 set_proxyauth_name_password(result);
491 }
492
493 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
494
495 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
496 if (http_proxy_authmethod) {
497 int i;
498 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
499 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
500 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
501 proxy_authmethods[i].curlauth_param);
502 break;
503 }
504 }
505 if (i == ARRAY_SIZE(proxy_authmethods)) {
506 warning("unsupported proxy authentication method %s: using anyauth",
507 http_proxy_authmethod);
508 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
509 }
510 }
511 else
512 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
513 #endif
514 }
515
516 static int has_cert_password(void)
517 {
518 if (ssl_cert == NULL || ssl_cert_password_required != 1)
519 return 0;
520 if (!cert_auth.password) {
521 cert_auth.protocol = xstrdup("cert");
522 cert_auth.username = xstrdup("");
523 cert_auth.path = xstrdup(ssl_cert);
524 credential_fill(&cert_auth);
525 }
526 return 1;
527 }
528
529 #if LIBCURL_VERSION_NUM >= 0x071900
530 static void set_curl_keepalive(CURL *c)
531 {
532 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
533 }
534
535 #elif LIBCURL_VERSION_NUM >= 0x071000
536 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
537 {
538 int ka = 1;
539 int rc;
540 socklen_t len = (socklen_t)sizeof(ka);
541
542 if (type != CURLSOCKTYPE_IPCXN)
543 return 0;
544
545 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
546 if (rc < 0)
547 warning_errno("unable to set SO_KEEPALIVE on socket");
548
549 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
550 }
551
552 static void set_curl_keepalive(CURL *c)
553 {
554 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
555 }
556
557 #else
558 static void set_curl_keepalive(CURL *c)
559 {
560 /* not supported on older curl versions */
561 }
562 #endif
563
564 static void redact_sensitive_header(struct strbuf *header)
565 {
566 const char *sensitive_header;
567
568 if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
569 skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
570 /* The first token is the type, which is OK to log */
571 while (isspace(*sensitive_header))
572 sensitive_header++;
573 while (*sensitive_header && !isspace(*sensitive_header))
574 sensitive_header++;
575 /* Everything else is opaque and possibly sensitive */
576 strbuf_setlen(header, sensitive_header - header->buf);
577 strbuf_addstr(header, " <redacted>");
578 }
579 }
580
581 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
582 {
583 struct strbuf out = STRBUF_INIT;
584 struct strbuf **headers, **header;
585
586 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
587 text, (long)size, (long)size);
588 trace_strbuf(&trace_curl, &out);
589 strbuf_reset(&out);
590 strbuf_add(&out, ptr, size);
591 headers = strbuf_split_max(&out, '\n', 0);
592
593 for (header = headers; *header; header++) {
594 if (hide_sensitive_header)
595 redact_sensitive_header(*header);
596 strbuf_insert((*header), 0, text, strlen(text));
597 strbuf_insert((*header), strlen(text), ": ", 2);
598 strbuf_rtrim((*header));
599 strbuf_addch((*header), '\n');
600 trace_strbuf(&trace_curl, (*header));
601 }
602 strbuf_list_free(headers);
603 strbuf_release(&out);
604 }
605
606 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
607 {
608 size_t i;
609 struct strbuf out = STRBUF_INIT;
610 unsigned int width = 60;
611
612 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
613 text, (long)size, (long)size);
614 trace_strbuf(&trace_curl, &out);
615
616 for (i = 0; i < size; i += width) {
617 size_t w;
618
619 strbuf_reset(&out);
620 strbuf_addf(&out, "%s: ", text);
621 for (w = 0; (w < width) && (i + w < size); w++) {
622 unsigned char ch = ptr[i + w];
623
624 strbuf_addch(&out,
625 (ch >= 0x20) && (ch < 0x80)
626 ? ch : '.');
627 }
628 strbuf_addch(&out, '\n');
629 trace_strbuf(&trace_curl, &out);
630 }
631 strbuf_release(&out);
632 }
633
634 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
635 {
636 const char *text;
637 enum { NO_FILTER = 0, DO_FILTER = 1 };
638
639 switch (type) {
640 case CURLINFO_TEXT:
641 trace_printf_key(&trace_curl, "== Info: %s", data);
642 break;
643 case CURLINFO_HEADER_OUT:
644 text = "=> Send header";
645 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
646 break;
647 case CURLINFO_DATA_OUT:
648 text = "=> Send data";
649 curl_dump_data(text, (unsigned char *)data, size);
650 break;
651 case CURLINFO_SSL_DATA_OUT:
652 text = "=> Send SSL data";
653 curl_dump_data(text, (unsigned char *)data, size);
654 break;
655 case CURLINFO_HEADER_IN:
656 text = "<= Recv header";
657 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
658 break;
659 case CURLINFO_DATA_IN:
660 text = "<= Recv data";
661 curl_dump_data(text, (unsigned char *)data, size);
662 break;
663 case CURLINFO_SSL_DATA_IN:
664 text = "<= Recv SSL data";
665 curl_dump_data(text, (unsigned char *)data, size);
666 break;
667
668 default: /* we ignore unknown types by default */
669 return 0;
670 }
671 return 0;
672 }
673
674 void setup_curl_trace(CURL *handle)
675 {
676 if (!trace_want(&trace_curl))
677 return;
678 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
679 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
680 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
681 }
682
683 #ifdef CURLPROTO_HTTP
684 static long get_curl_allowed_protocols(int from_user)
685 {
686 long allowed_protocols = 0;
687
688 if (is_transport_allowed("http", from_user))
689 allowed_protocols |= CURLPROTO_HTTP;
690 if (is_transport_allowed("https", from_user))
691 allowed_protocols |= CURLPROTO_HTTPS;
692 if (is_transport_allowed("ftp", from_user))
693 allowed_protocols |= CURLPROTO_FTP;
694 if (is_transport_allowed("ftps", from_user))
695 allowed_protocols |= CURLPROTO_FTPS;
696
697 return allowed_protocols;
698 }
699 #endif
700
701 static CURL *get_curl_handle(void)
702 {
703 CURL *result = curl_easy_init();
704
705 if (!result)
706 die("curl_easy_init failed");
707
708 if (!curl_ssl_verify) {
709 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
710 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
711 } else {
712 /* Verify authenticity of the peer's certificate */
713 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
714 /* The name in the cert must match whom we tried to connect */
715 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
716 }
717
718 #if LIBCURL_VERSION_NUM >= 0x070907
719 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
720 #endif
721 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
722 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
723 #endif
724
725 #ifdef CURLGSSAPI_DELEGATION_FLAG
726 if (curl_deleg) {
727 int i;
728 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
729 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
730 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
731 curl_deleg_levels[i].curl_deleg_param);
732 break;
733 }
734 }
735 if (i == ARRAY_SIZE(curl_deleg_levels))
736 warning("Unknown delegation method '%s': using default",
737 curl_deleg);
738 }
739 #endif
740
741 if (http_proactive_auth)
742 init_curl_http_auth(result);
743
744 if (getenv("GIT_SSL_VERSION"))
745 ssl_version = getenv("GIT_SSL_VERSION");
746 if (ssl_version && *ssl_version) {
747 int i;
748 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
749 if (!strcmp(ssl_version, sslversions[i].name)) {
750 curl_easy_setopt(result, CURLOPT_SSLVERSION,
751 sslversions[i].ssl_version);
752 break;
753 }
754 }
755 if (i == ARRAY_SIZE(sslversions))
756 warning("unsupported ssl version %s: using default",
757 ssl_version);
758 }
759
760 if (getenv("GIT_SSL_CIPHER_LIST"))
761 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
762 if (ssl_cipherlist != NULL && *ssl_cipherlist)
763 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
764 ssl_cipherlist);
765
766 if (ssl_cert != NULL)
767 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
768 if (has_cert_password())
769 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
770 #if LIBCURL_VERSION_NUM >= 0x070903
771 if (ssl_key != NULL)
772 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
773 #endif
774 #if LIBCURL_VERSION_NUM >= 0x070908
775 if (ssl_capath != NULL)
776 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
777 #endif
778 #if LIBCURL_VERSION_NUM >= 0x072c00
779 if (ssl_pinnedkey != NULL)
780 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
781 #endif
782 if (ssl_cainfo != NULL)
783 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
784
785 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
786 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
787 curl_low_speed_limit);
788 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
789 curl_low_speed_time);
790 }
791
792 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
793 #if LIBCURL_VERSION_NUM >= 0x071301
794 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
795 #elif LIBCURL_VERSION_NUM >= 0x071101
796 curl_easy_setopt(result, CURLOPT_POST301, 1);
797 #endif
798 #ifdef CURLPROTO_HTTP
799 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
800 get_curl_allowed_protocols(0));
801 curl_easy_setopt(result, CURLOPT_PROTOCOLS,
802 get_curl_allowed_protocols(-1));
803 #else
804 warning("protocol restrictions not applied to curl redirects because\n"
805 "your curl version is too old (>= 7.19.4)");
806 #endif
807 if (getenv("GIT_CURL_VERBOSE"))
808 curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
809 setup_curl_trace(result);
810
811 curl_easy_setopt(result, CURLOPT_USERAGENT,
812 user_agent ? user_agent : git_user_agent());
813
814 if (curl_ftp_no_epsv)
815 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
816
817 #ifdef CURLOPT_USE_SSL
818 if (curl_ssl_try)
819 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
820 #endif
821
822 /*
823 * CURL also examines these variables as a fallback; but we need to query
824 * them here in order to decide whether to prompt for missing password (cf.
825 * init_curl_proxy_auth()).
826 *
827 * Unlike many other common environment variables, these are historically
828 * lowercase only. It appears that CURL did not know this and implemented
829 * only uppercase variants, which was later corrected to take both - with
830 * the exception of http_proxy, which is lowercase only also in CURL. As
831 * the lowercase versions are the historical quasi-standard, they take
832 * precedence here, as in CURL.
833 */
834 if (!curl_http_proxy) {
835 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
836 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
837 var_override(&curl_http_proxy, getenv("https_proxy"));
838 } else {
839 var_override(&curl_http_proxy, getenv("http_proxy"));
840 }
841 if (!curl_http_proxy) {
842 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
843 var_override(&curl_http_proxy, getenv("all_proxy"));
844 }
845 }
846
847 if (curl_http_proxy && curl_http_proxy[0] == '\0') {
848 /*
849 * Handle case with the empty http.proxy value here to keep
850 * common code clean.
851 * NB: empty option disables proxying at all.
852 */
853 curl_easy_setopt(result, CURLOPT_PROXY, "");
854 } else if (curl_http_proxy) {
855 #if LIBCURL_VERSION_NUM >= 0x071800
856 if (starts_with(curl_http_proxy, "socks5h"))
857 curl_easy_setopt(result,
858 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
859 else if (starts_with(curl_http_proxy, "socks5"))
860 curl_easy_setopt(result,
861 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
862 else if (starts_with(curl_http_proxy, "socks4a"))
863 curl_easy_setopt(result,
864 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
865 else if (starts_with(curl_http_proxy, "socks"))
866 curl_easy_setopt(result,
867 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
868 #endif
869 if (strstr(curl_http_proxy, "://"))
870 credential_from_url(&proxy_auth, curl_http_proxy);
871 else {
872 struct strbuf url = STRBUF_INIT;
873 strbuf_addf(&url, "http://%s", curl_http_proxy);
874 credential_from_url(&proxy_auth, url.buf);
875 strbuf_release(&url);
876 }
877
878 if (!proxy_auth.host)
879 die("Invalid proxy URL '%s'", curl_http_proxy);
880
881 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
882 #if LIBCURL_VERSION_NUM >= 0x071304
883 var_override(&curl_no_proxy, getenv("NO_PROXY"));
884 var_override(&curl_no_proxy, getenv("no_proxy"));
885 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
886 #endif
887 }
888 init_curl_proxy_auth(result);
889
890 set_curl_keepalive(result);
891
892 return result;
893 }
894
895 static void set_from_env(const char **var, const char *envname)
896 {
897 const char *val = getenv(envname);
898 if (val)
899 *var = val;
900 }
901
902 static void protocol_http_header(void)
903 {
904 if (get_protocol_version_config() > 0) {
905 struct strbuf protocol_header = STRBUF_INIT;
906
907 strbuf_addf(&protocol_header, GIT_PROTOCOL_HEADER ": version=%d",
908 get_protocol_version_config());
909
910
911 extra_http_headers = curl_slist_append(extra_http_headers,
912 protocol_header.buf);
913 strbuf_release(&protocol_header);
914 }
915 }
916
917 void http_init(struct remote *remote, const char *url, int proactive_auth)
918 {
919 char *low_speed_limit;
920 char *low_speed_time;
921 char *normalized_url;
922 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
923
924 config.section = "http";
925 config.key = NULL;
926 config.collect_fn = http_options;
927 config.cascade_fn = git_default_config;
928 config.cb = NULL;
929
930 http_is_verbose = 0;
931 normalized_url = url_normalize(url, &config.url);
932
933 git_config(urlmatch_config_entry, &config);
934 free(normalized_url);
935
936 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
937 die("curl_global_init failed");
938
939 http_proactive_auth = proactive_auth;
940
941 if (remote && remote->http_proxy)
942 curl_http_proxy = xstrdup(remote->http_proxy);
943
944 if (remote)
945 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
946
947 protocol_http_header();
948
949 pragma_header = curl_slist_append(http_copy_default_headers(),
950 "Pragma: no-cache");
951 no_pragma_header = curl_slist_append(http_copy_default_headers(),
952 "Pragma:");
953
954 #ifdef USE_CURL_MULTI
955 {
956 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
957 if (http_max_requests != NULL)
958 max_requests = atoi(http_max_requests);
959 }
960
961 curlm = curl_multi_init();
962 if (!curlm)
963 die("curl_multi_init failed");
964 #endif
965
966 if (getenv("GIT_SSL_NO_VERIFY"))
967 curl_ssl_verify = 0;
968
969 set_from_env(&ssl_cert, "GIT_SSL_CERT");
970 #if LIBCURL_VERSION_NUM >= 0x070903
971 set_from_env(&ssl_key, "GIT_SSL_KEY");
972 #endif
973 #if LIBCURL_VERSION_NUM >= 0x070908
974 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
975 #endif
976 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
977
978 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
979
980 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
981 if (low_speed_limit != NULL)
982 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
983 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
984 if (low_speed_time != NULL)
985 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
986
987 if (curl_ssl_verify == -1)
988 curl_ssl_verify = 1;
989
990 curl_session_count = 0;
991 #ifdef USE_CURL_MULTI
992 if (max_requests < 1)
993 max_requests = DEFAULT_MAX_REQUESTS;
994 #endif
995
996 if (getenv("GIT_CURL_FTP_NO_EPSV"))
997 curl_ftp_no_epsv = 1;
998
999 if (url) {
1000 credential_from_url(&http_auth, url);
1001 if (!ssl_cert_password_required &&
1002 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1003 starts_with(url, "https://"))
1004 ssl_cert_password_required = 1;
1005 }
1006
1007 #ifndef NO_CURL_EASY_DUPHANDLE
1008 curl_default = get_curl_handle();
1009 #endif
1010 }
1011
1012 void http_cleanup(void)
1013 {
1014 struct active_request_slot *slot = active_queue_head;
1015
1016 while (slot != NULL) {
1017 struct active_request_slot *next = slot->next;
1018 if (slot->curl != NULL) {
1019 xmulti_remove_handle(slot);
1020 curl_easy_cleanup(slot->curl);
1021 }
1022 free(slot);
1023 slot = next;
1024 }
1025 active_queue_head = NULL;
1026
1027 #ifndef NO_CURL_EASY_DUPHANDLE
1028 curl_easy_cleanup(curl_default);
1029 #endif
1030
1031 #ifdef USE_CURL_MULTI
1032 curl_multi_cleanup(curlm);
1033 #endif
1034 curl_global_cleanup();
1035
1036 curl_slist_free_all(extra_http_headers);
1037 extra_http_headers = NULL;
1038
1039 curl_slist_free_all(pragma_header);
1040 pragma_header = NULL;
1041
1042 curl_slist_free_all(no_pragma_header);
1043 no_pragma_header = NULL;
1044
1045 if (curl_http_proxy) {
1046 free((void *)curl_http_proxy);
1047 curl_http_proxy = NULL;
1048 }
1049
1050 if (proxy_auth.password) {
1051 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1052 FREE_AND_NULL(proxy_auth.password);
1053 }
1054
1055 free((void *)curl_proxyuserpwd);
1056 curl_proxyuserpwd = NULL;
1057
1058 free((void *)http_proxy_authmethod);
1059 http_proxy_authmethod = NULL;
1060
1061 if (cert_auth.password != NULL) {
1062 memset(cert_auth.password, 0, strlen(cert_auth.password));
1063 FREE_AND_NULL(cert_auth.password);
1064 }
1065 ssl_cert_password_required = 0;
1066
1067 FREE_AND_NULL(cached_accept_language);
1068 }
1069
1070 struct active_request_slot *get_active_slot(void)
1071 {
1072 struct active_request_slot *slot = active_queue_head;
1073 struct active_request_slot *newslot;
1074
1075 #ifdef USE_CURL_MULTI
1076 int num_transfers;
1077
1078 /* Wait for a slot to open up if the queue is full */
1079 while (active_requests >= max_requests) {
1080 curl_multi_perform(curlm, &num_transfers);
1081 if (num_transfers < active_requests)
1082 process_curl_messages();
1083 }
1084 #endif
1085
1086 while (slot != NULL && slot->in_use)
1087 slot = slot->next;
1088
1089 if (slot == NULL) {
1090 newslot = xmalloc(sizeof(*newslot));
1091 newslot->curl = NULL;
1092 newslot->in_use = 0;
1093 newslot->next = NULL;
1094
1095 slot = active_queue_head;
1096 if (slot == NULL) {
1097 active_queue_head = newslot;
1098 } else {
1099 while (slot->next != NULL)
1100 slot = slot->next;
1101 slot->next = newslot;
1102 }
1103 slot = newslot;
1104 }
1105
1106 if (slot->curl == NULL) {
1107 #ifdef NO_CURL_EASY_DUPHANDLE
1108 slot->curl = get_curl_handle();
1109 #else
1110 slot->curl = curl_easy_duphandle(curl_default);
1111 #endif
1112 curl_session_count++;
1113 }
1114
1115 active_requests++;
1116 slot->in_use = 1;
1117 slot->results = NULL;
1118 slot->finished = NULL;
1119 slot->callback_data = NULL;
1120 slot->callback_func = NULL;
1121 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1122 if (curl_save_cookies)
1123 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1124 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1125 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1126 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1127 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1128 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1129 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1130 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1131 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1132 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1133 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1134
1135 /*
1136 * Default following to off unless "ALWAYS" is configured; this gives
1137 * callers a sane starting point, and they can tweak for individual
1138 * HTTP_FOLLOW_* cases themselves.
1139 */
1140 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1141 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1142 else
1143 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1144
1145 #if LIBCURL_VERSION_NUM >= 0x070a08
1146 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1147 #endif
1148 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1149 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1150 #endif
1151 if (http_auth.password || curl_empty_auth_enabled())
1152 init_curl_http_auth(slot->curl);
1153
1154 return slot;
1155 }
1156
1157 int start_active_slot(struct active_request_slot *slot)
1158 {
1159 #ifdef USE_CURL_MULTI
1160 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1161 int num_transfers;
1162
1163 if (curlm_result != CURLM_OK &&
1164 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1165 warning("curl_multi_add_handle failed: %s",
1166 curl_multi_strerror(curlm_result));
1167 active_requests--;
1168 slot->in_use = 0;
1169 return 0;
1170 }
1171
1172 /*
1173 * We know there must be something to do, since we just added
1174 * something.
1175 */
1176 curl_multi_perform(curlm, &num_transfers);
1177 #endif
1178 return 1;
1179 }
1180
1181 #ifdef USE_CURL_MULTI
1182 struct fill_chain {
1183 void *data;
1184 int (*fill)(void *);
1185 struct fill_chain *next;
1186 };
1187
1188 static struct fill_chain *fill_cfg;
1189
1190 void add_fill_function(void *data, int (*fill)(void *))
1191 {
1192 struct fill_chain *new = xmalloc(sizeof(*new));
1193 struct fill_chain **linkp = &fill_cfg;
1194 new->data = data;
1195 new->fill = fill;
1196 new->next = NULL;
1197 while (*linkp)
1198 linkp = &(*linkp)->next;
1199 *linkp = new;
1200 }
1201
1202 void fill_active_slots(void)
1203 {
1204 struct active_request_slot *slot = active_queue_head;
1205
1206 while (active_requests < max_requests) {
1207 struct fill_chain *fill;
1208 for (fill = fill_cfg; fill; fill = fill->next)
1209 if (fill->fill(fill->data))
1210 break;
1211
1212 if (!fill)
1213 break;
1214 }
1215
1216 while (slot != NULL) {
1217 if (!slot->in_use && slot->curl != NULL
1218 && curl_session_count > min_curl_sessions) {
1219 curl_easy_cleanup(slot->curl);
1220 slot->curl = NULL;
1221 curl_session_count--;
1222 }
1223 slot = slot->next;
1224 }
1225 }
1226
1227 void step_active_slots(void)
1228 {
1229 int num_transfers;
1230 CURLMcode curlm_result;
1231
1232 do {
1233 curlm_result = curl_multi_perform(curlm, &num_transfers);
1234 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1235 if (num_transfers < active_requests) {
1236 process_curl_messages();
1237 fill_active_slots();
1238 }
1239 }
1240 #endif
1241
1242 void run_active_slot(struct active_request_slot *slot)
1243 {
1244 #ifdef USE_CURL_MULTI
1245 fd_set readfds;
1246 fd_set writefds;
1247 fd_set excfds;
1248 int max_fd;
1249 struct timeval select_timeout;
1250 int finished = 0;
1251
1252 slot->finished = &finished;
1253 while (!finished) {
1254 step_active_slots();
1255
1256 if (slot->in_use) {
1257 #if LIBCURL_VERSION_NUM >= 0x070f04
1258 long curl_timeout;
1259 curl_multi_timeout(curlm, &curl_timeout);
1260 if (curl_timeout == 0) {
1261 continue;
1262 } else if (curl_timeout == -1) {
1263 select_timeout.tv_sec = 0;
1264 select_timeout.tv_usec = 50000;
1265 } else {
1266 select_timeout.tv_sec = curl_timeout / 1000;
1267 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1268 }
1269 #else
1270 select_timeout.tv_sec = 0;
1271 select_timeout.tv_usec = 50000;
1272 #endif
1273
1274 max_fd = -1;
1275 FD_ZERO(&readfds);
1276 FD_ZERO(&writefds);
1277 FD_ZERO(&excfds);
1278 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1279
1280 /*
1281 * It can happen that curl_multi_timeout returns a pathologically
1282 * long timeout when curl_multi_fdset returns no file descriptors
1283 * to read. See commit message for more details.
1284 */
1285 if (max_fd < 0 &&
1286 (select_timeout.tv_sec > 0 ||
1287 select_timeout.tv_usec > 50000)) {
1288 select_timeout.tv_sec = 0;
1289 select_timeout.tv_usec = 50000;
1290 }
1291
1292 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1293 }
1294 }
1295 #else
1296 while (slot->in_use) {
1297 slot->curl_result = curl_easy_perform(slot->curl);
1298 finish_active_slot(slot);
1299 }
1300 #endif
1301 }
1302
1303 static void release_active_slot(struct active_request_slot *slot)
1304 {
1305 closedown_active_slot(slot);
1306 if (slot->curl) {
1307 xmulti_remove_handle(slot);
1308 if (curl_session_count > min_curl_sessions) {
1309 curl_easy_cleanup(slot->curl);
1310 slot->curl = NULL;
1311 curl_session_count--;
1312 }
1313 }
1314 #ifdef USE_CURL_MULTI
1315 fill_active_slots();
1316 #endif
1317 }
1318
1319 void finish_all_active_slots(void)
1320 {
1321 struct active_request_slot *slot = active_queue_head;
1322
1323 while (slot != NULL)
1324 if (slot->in_use) {
1325 run_active_slot(slot);
1326 slot = active_queue_head;
1327 } else {
1328 slot = slot->next;
1329 }
1330 }
1331
1332 /* Helpers for modifying and creating URLs */
1333 static inline int needs_quote(int ch)
1334 {
1335 if (((ch >= 'A') && (ch <= 'Z'))
1336 || ((ch >= 'a') && (ch <= 'z'))
1337 || ((ch >= '0') && (ch <= '9'))
1338 || (ch == '/')
1339 || (ch == '-')
1340 || (ch == '.'))
1341 return 0;
1342 return 1;
1343 }
1344
1345 static char *quote_ref_url(const char *base, const char *ref)
1346 {
1347 struct strbuf buf = STRBUF_INIT;
1348 const char *cp;
1349 int ch;
1350
1351 end_url_with_slash(&buf, base);
1352
1353 for (cp = ref; (ch = *cp) != 0; cp++)
1354 if (needs_quote(ch))
1355 strbuf_addf(&buf, "%%%02x", ch);
1356 else
1357 strbuf_addch(&buf, *cp);
1358
1359 return strbuf_detach(&buf, NULL);
1360 }
1361
1362 void append_remote_object_url(struct strbuf *buf, const char *url,
1363 const char *hex,
1364 int only_two_digit_prefix)
1365 {
1366 end_url_with_slash(buf, url);
1367
1368 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1369 if (!only_two_digit_prefix)
1370 strbuf_addstr(buf, hex + 2);
1371 }
1372
1373 char *get_remote_object_url(const char *url, const char *hex,
1374 int only_two_digit_prefix)
1375 {
1376 struct strbuf buf = STRBUF_INIT;
1377 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1378 return strbuf_detach(&buf, NULL);
1379 }
1380
1381 static int handle_curl_result(struct slot_results *results)
1382 {
1383 /*
1384 * If we see a failing http code with CURLE_OK, we have turned off
1385 * FAILONERROR (to keep the server's custom error response), and should
1386 * translate the code into failure here.
1387 *
1388 * Likewise, if we see a redirect (30x code), that means we turned off
1389 * redirect-following, and we should treat the result as an error.
1390 */
1391 if (results->curl_result == CURLE_OK &&
1392 results->http_code >= 300) {
1393 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1394 /*
1395 * Normally curl will already have put the "reason phrase"
1396 * from the server into curl_errorstr; unfortunately without
1397 * FAILONERROR it is lost, so we can give only the numeric
1398 * status code.
1399 */
1400 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1401 "The requested URL returned error: %ld",
1402 results->http_code);
1403 }
1404
1405 if (results->curl_result == CURLE_OK) {
1406 credential_approve(&http_auth);
1407 if (proxy_auth.password)
1408 credential_approve(&proxy_auth);
1409 return HTTP_OK;
1410 } else if (missing_target(results))
1411 return HTTP_MISSING_TARGET;
1412 else if (results->http_code == 401) {
1413 if (http_auth.username && http_auth.password) {
1414 credential_reject(&http_auth);
1415 return HTTP_NOAUTH;
1416 } else {
1417 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1418 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1419 if (results->auth_avail) {
1420 http_auth_methods &= results->auth_avail;
1421 http_auth_methods_restricted = 1;
1422 }
1423 #endif
1424 return HTTP_REAUTH;
1425 }
1426 } else {
1427 if (results->http_connectcode == 407)
1428 credential_reject(&proxy_auth);
1429 #if LIBCURL_VERSION_NUM >= 0x070c00
1430 if (!curl_errorstr[0])
1431 strlcpy(curl_errorstr,
1432 curl_easy_strerror(results->curl_result),
1433 sizeof(curl_errorstr));
1434 #endif
1435 return HTTP_ERROR;
1436 }
1437 }
1438
1439 int run_one_slot(struct active_request_slot *slot,
1440 struct slot_results *results)
1441 {
1442 slot->results = results;
1443 if (!start_active_slot(slot)) {
1444 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1445 "failed to start HTTP request");
1446 return HTTP_START_FAILED;
1447 }
1448
1449 run_active_slot(slot);
1450 return handle_curl_result(results);
1451 }
1452
1453 struct curl_slist *http_copy_default_headers(void)
1454 {
1455 struct curl_slist *headers = NULL, *h;
1456
1457 for (h = extra_http_headers; h; h = h->next)
1458 headers = curl_slist_append(headers, h->data);
1459
1460 return headers;
1461 }
1462
1463 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1464 {
1465 char *ptr;
1466 CURLcode ret;
1467
1468 strbuf_reset(buf);
1469 ret = curl_easy_getinfo(curl, info, &ptr);
1470 if (!ret && ptr)
1471 strbuf_addstr(buf, ptr);
1472 return ret;
1473 }
1474
1475 /*
1476 * Check for and extract a content-type parameter. "raw"
1477 * should be positioned at the start of the potential
1478 * parameter, with any whitespace already removed.
1479 *
1480 * "name" is the name of the parameter. The value is appended
1481 * to "out".
1482 */
1483 static int extract_param(const char *raw, const char *name,
1484 struct strbuf *out)
1485 {
1486 size_t len = strlen(name);
1487
1488 if (strncasecmp(raw, name, len))
1489 return -1;
1490 raw += len;
1491
1492 if (*raw != '=')
1493 return -1;
1494 raw++;
1495
1496 while (*raw && !isspace(*raw) && *raw != ';')
1497 strbuf_addch(out, *raw++);
1498 return 0;
1499 }
1500
1501 /*
1502 * Extract a normalized version of the content type, with any
1503 * spaces suppressed, all letters lowercased, and no trailing ";"
1504 * or parameters.
1505 *
1506 * Note that we will silently remove even invalid whitespace. For
1507 * example, "text / plain" is specifically forbidden by RFC 2616,
1508 * but "text/plain" is the only reasonable output, and this keeps
1509 * our code simple.
1510 *
1511 * If the "charset" argument is not NULL, store the value of any
1512 * charset parameter there.
1513 *
1514 * Example:
1515 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1516 * "text / plain" -> "text/plain"
1517 */
1518 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1519 struct strbuf *charset)
1520 {
1521 const char *p;
1522
1523 strbuf_reset(type);
1524 strbuf_grow(type, raw->len);
1525 for (p = raw->buf; *p; p++) {
1526 if (isspace(*p))
1527 continue;
1528 if (*p == ';') {
1529 p++;
1530 break;
1531 }
1532 strbuf_addch(type, tolower(*p));
1533 }
1534
1535 if (!charset)
1536 return;
1537
1538 strbuf_reset(charset);
1539 while (*p) {
1540 while (isspace(*p) || *p == ';')
1541 p++;
1542 if (!extract_param(p, "charset", charset))
1543 return;
1544 while (*p && !isspace(*p))
1545 p++;
1546 }
1547
1548 if (!charset->len && starts_with(type->buf, "text/"))
1549 strbuf_addstr(charset, "ISO-8859-1");
1550 }
1551
1552 static void write_accept_language(struct strbuf *buf)
1553 {
1554 /*
1555 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1556 * that, q-value will be smaller than 0.001, the minimum q-value the
1557 * HTTP specification allows. See
1558 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1559 */
1560 const int MAX_DECIMAL_PLACES = 3;
1561 const int MAX_LANGUAGE_TAGS = 1000;
1562 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1563 char **language_tags = NULL;
1564 int num_langs = 0;
1565 const char *s = get_preferred_languages();
1566 int i;
1567 struct strbuf tag = STRBUF_INIT;
1568
1569 /* Don't add Accept-Language header if no language is preferred. */
1570 if (!s)
1571 return;
1572
1573 /*
1574 * Split the colon-separated string of preferred languages into
1575 * language_tags array.
1576 */
1577 do {
1578 /* collect language tag */
1579 for (; *s && (isalnum(*s) || *s == '_'); s++)
1580 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1581
1582 /* skip .codeset, @modifier and any other unnecessary parts */
1583 while (*s && *s != ':')
1584 s++;
1585
1586 if (tag.len) {
1587 num_langs++;
1588 REALLOC_ARRAY(language_tags, num_langs);
1589 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1590 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1591 break;
1592 }
1593 } while (*s++);
1594
1595 /* write Accept-Language header into buf */
1596 if (num_langs) {
1597 int last_buf_len = 0;
1598 int max_q;
1599 int decimal_places;
1600 char q_format[32];
1601
1602 /* add '*' */
1603 REALLOC_ARRAY(language_tags, num_langs + 1);
1604 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1605
1606 /* compute decimal_places */
1607 for (max_q = 1, decimal_places = 0;
1608 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1609 decimal_places++, max_q *= 10)
1610 ;
1611
1612 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1613
1614 strbuf_addstr(buf, "Accept-Language: ");
1615
1616 for (i = 0; i < num_langs; i++) {
1617 if (i > 0)
1618 strbuf_addstr(buf, ", ");
1619
1620 strbuf_addstr(buf, language_tags[i]);
1621
1622 if (i > 0)
1623 strbuf_addf(buf, q_format, max_q - i);
1624
1625 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1626 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1627 break;
1628 }
1629
1630 last_buf_len = buf->len;
1631 }
1632 }
1633
1634 /* free language tags -- last one is a static '*' */
1635 for (i = 0; i < num_langs - 1; i++)
1636 free(language_tags[i]);
1637 free(language_tags);
1638 }
1639
1640 /*
1641 * Get an Accept-Language header which indicates user's preferred languages.
1642 *
1643 * Examples:
1644 * LANGUAGE= -> ""
1645 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1646 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1647 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1648 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1649 * LANGUAGE= LANG=C -> ""
1650 */
1651 static const char *get_accept_language(void)
1652 {
1653 if (!cached_accept_language) {
1654 struct strbuf buf = STRBUF_INIT;
1655 write_accept_language(&buf);
1656 if (buf.len > 0)
1657 cached_accept_language = strbuf_detach(&buf, NULL);
1658 }
1659
1660 return cached_accept_language;
1661 }
1662
1663 static void http_opt_request_remainder(CURL *curl, off_t pos)
1664 {
1665 char buf[128];
1666 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1667 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1668 }
1669
1670 /* http_request() targets */
1671 #define HTTP_REQUEST_STRBUF 0
1672 #define HTTP_REQUEST_FILE 1
1673
1674 static int http_request(const char *url,
1675 void *result, int target,
1676 const struct http_get_options *options)
1677 {
1678 struct active_request_slot *slot;
1679 struct slot_results results;
1680 struct curl_slist *headers = http_copy_default_headers();
1681 struct strbuf buf = STRBUF_INIT;
1682 const char *accept_language;
1683 int ret;
1684
1685 slot = get_active_slot();
1686 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1687
1688 if (result == NULL) {
1689 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1690 } else {
1691 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1692 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1693
1694 if (target == HTTP_REQUEST_FILE) {
1695 off_t posn = ftello(result);
1696 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1697 fwrite);
1698 if (posn > 0)
1699 http_opt_request_remainder(slot->curl, posn);
1700 } else
1701 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1702 fwrite_buffer);
1703 }
1704
1705 accept_language = get_accept_language();
1706
1707 if (accept_language)
1708 headers = curl_slist_append(headers, accept_language);
1709
1710 strbuf_addstr(&buf, "Pragma:");
1711 if (options && options->no_cache)
1712 strbuf_addstr(&buf, " no-cache");
1713 if (options && options->keep_error)
1714 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1715 if (options && options->initial_request &&
1716 http_follow_config == HTTP_FOLLOW_INITIAL)
1717 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1718
1719 headers = curl_slist_append(headers, buf.buf);
1720
1721 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1722 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1723 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1724
1725 ret = run_one_slot(slot, &results);
1726
1727 if (options && options->content_type) {
1728 struct strbuf raw = STRBUF_INIT;
1729 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1730 extract_content_type(&raw, options->content_type,
1731 options->charset);
1732 strbuf_release(&raw);
1733 }
1734
1735 if (options && options->effective_url)
1736 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1737 options->effective_url);
1738
1739 curl_slist_free_all(headers);
1740 strbuf_release(&buf);
1741
1742 return ret;
1743 }
1744
1745 /*
1746 * Update the "base" url to a more appropriate value, as deduced by
1747 * redirects seen when requesting a URL starting with "url".
1748 *
1749 * The "asked" parameter is a URL that we asked curl to access, and must begin
1750 * with "base".
1751 *
1752 * The "got" parameter is the URL that curl reported to us as where we ended
1753 * up.
1754 *
1755 * Returns 1 if we updated the base url, 0 otherwise.
1756 *
1757 * Our basic strategy is to compare "base" and "asked" to find the bits
1758 * specific to our request. We then strip those bits off of "got" to yield the
1759 * new base. So for example, if our base is "http://example.com/foo.git",
1760 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1761 * with "https://other.example.com/foo.git/info/refs". We would want the
1762 * new URL to become "https://other.example.com/foo.git".
1763 *
1764 * Note that this assumes a sane redirect scheme. It's entirely possible
1765 * in the example above to end up at a URL that does not even end in
1766 * "info/refs". In such a case we die. There's not much we can do, such a
1767 * scheme is unlikely to represent a real git repository, and failing to
1768 * rewrite the base opens options for malicious redirects to do funny things.
1769 */
1770 static int update_url_from_redirect(struct strbuf *base,
1771 const char *asked,
1772 const struct strbuf *got)
1773 {
1774 const char *tail;
1775 size_t new_len;
1776
1777 if (!strcmp(asked, got->buf))
1778 return 0;
1779
1780 if (!skip_prefix(asked, base->buf, &tail))
1781 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1782 asked, base->buf);
1783
1784 new_len = got->len;
1785 if (!strip_suffix_mem(got->buf, &new_len, tail))
1786 die(_("unable to update url base from redirection:\n"
1787 " asked for: %s\n"
1788 " redirect: %s"),
1789 asked, got->buf);
1790
1791 strbuf_reset(base);
1792 strbuf_add(base, got->buf, new_len);
1793
1794 return 1;
1795 }
1796
1797 static int http_request_reauth(const char *url,
1798 void *result, int target,
1799 struct http_get_options *options)
1800 {
1801 int ret = http_request(url, result, target, options);
1802
1803 if (ret != HTTP_OK && ret != HTTP_REAUTH)
1804 return ret;
1805
1806 if (options && options->effective_url && options->base_url) {
1807 if (update_url_from_redirect(options->base_url,
1808 url, options->effective_url)) {
1809 credential_from_url(&http_auth, options->base_url->buf);
1810 url = options->effective_url->buf;
1811 }
1812 }
1813
1814 if (ret != HTTP_REAUTH)
1815 return ret;
1816
1817 /*
1818 * If we are using KEEP_ERROR, the previous request may have
1819 * put cruft into our output stream; we should clear it out before
1820 * making our next request. We only know how to do this for
1821 * the strbuf case, but that is enough to satisfy current callers.
1822 */
1823 if (options && options->keep_error) {
1824 switch (target) {
1825 case HTTP_REQUEST_STRBUF:
1826 strbuf_reset(result);
1827 break;
1828 default:
1829 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1830 }
1831 }
1832
1833 credential_fill(&http_auth);
1834
1835 return http_request(url, result, target, options);
1836 }
1837
1838 int http_get_strbuf(const char *url,
1839 struct strbuf *result,
1840 struct http_get_options *options)
1841 {
1842 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1843 }
1844
1845 /*
1846 * Downloads a URL and stores the result in the given file.
1847 *
1848 * If a previous interrupted download is detected (i.e. a previous temporary
1849 * file is still around) the download is resumed.
1850 */
1851 static int http_get_file(const char *url, const char *filename,
1852 struct http_get_options *options)
1853 {
1854 int ret;
1855 struct strbuf tmpfile = STRBUF_INIT;
1856 FILE *result;
1857
1858 strbuf_addf(&tmpfile, "%s.temp", filename);
1859 result = fopen(tmpfile.buf, "a");
1860 if (!result) {
1861 error("Unable to open local file %s", tmpfile.buf);
1862 ret = HTTP_ERROR;
1863 goto cleanup;
1864 }
1865
1866 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1867 fclose(result);
1868
1869 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1870 ret = HTTP_ERROR;
1871 cleanup:
1872 strbuf_release(&tmpfile);
1873 return ret;
1874 }
1875
1876 int http_fetch_ref(const char *base, struct ref *ref)
1877 {
1878 struct http_get_options options = {0};
1879 char *url;
1880 struct strbuf buffer = STRBUF_INIT;
1881 int ret = -1;
1882
1883 options.no_cache = 1;
1884
1885 url = quote_ref_url(base, ref->name);
1886 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1887 strbuf_rtrim(&buffer);
1888 if (buffer.len == 40)
1889 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1890 else if (starts_with(buffer.buf, "ref: ")) {
1891 ref->symref = xstrdup(buffer.buf + 5);
1892 ret = 0;
1893 }
1894 }
1895
1896 strbuf_release(&buffer);
1897 free(url);
1898 return ret;
1899 }
1900
1901 /* Helpers for fetching packs */
1902 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1903 {
1904 char *url, *tmp;
1905 struct strbuf buf = STRBUF_INIT;
1906
1907 if (http_is_verbose)
1908 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1909
1910 end_url_with_slash(&buf, base_url);
1911 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1912 url = strbuf_detach(&buf, NULL);
1913
1914 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1915 tmp = strbuf_detach(&buf, NULL);
1916
1917 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1918 error("Unable to get pack index %s", url);
1919 FREE_AND_NULL(tmp);
1920 }
1921
1922 free(url);
1923 return tmp;
1924 }
1925
1926 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1927 unsigned char *sha1, const char *base_url)
1928 {
1929 struct packed_git *new_pack;
1930 char *tmp_idx = NULL;
1931 int ret;
1932
1933 if (has_pack_index(sha1)) {
1934 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1935 if (!new_pack)
1936 return -1; /* parse_pack_index() already issued error message */
1937 goto add_pack;
1938 }
1939
1940 tmp_idx = fetch_pack_index(sha1, base_url);
1941 if (!tmp_idx)
1942 return -1;
1943
1944 new_pack = parse_pack_index(sha1, tmp_idx);
1945 if (!new_pack) {
1946 unlink(tmp_idx);
1947 free(tmp_idx);
1948
1949 return -1; /* parse_pack_index() already issued error message */
1950 }
1951
1952 ret = verify_pack_index(new_pack);
1953 if (!ret) {
1954 close_pack_index(new_pack);
1955 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1956 }
1957 free(tmp_idx);
1958 if (ret)
1959 return -1;
1960
1961 add_pack:
1962 new_pack->next = *packs_head;
1963 *packs_head = new_pack;
1964 return 0;
1965 }
1966
1967 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1968 {
1969 struct http_get_options options = {0};
1970 int ret = 0, i = 0;
1971 char *url, *data;
1972 struct strbuf buf = STRBUF_INIT;
1973 unsigned char sha1[20];
1974
1975 end_url_with_slash(&buf, base_url);
1976 strbuf_addstr(&buf, "objects/info/packs");
1977 url = strbuf_detach(&buf, NULL);
1978
1979 options.no_cache = 1;
1980 ret = http_get_strbuf(url, &buf, &options);
1981 if (ret != HTTP_OK)
1982 goto cleanup;
1983
1984 data = buf.buf;
1985 while (i < buf.len) {
1986 switch (data[i]) {
1987 case 'P':
1988 i++;
1989 if (i + 52 <= buf.len &&
1990 starts_with(data + i, " pack-") &&
1991 starts_with(data + i + 46, ".pack\n")) {
1992 get_sha1_hex(data + i + 6, sha1);
1993 fetch_and_setup_pack_index(packs_head, sha1,
1994 base_url);
1995 i += 51;
1996 break;
1997 }
1998 default:
1999 while (i < buf.len && data[i] != '\n')
2000 i++;
2001 }
2002 i++;
2003 }
2004
2005 cleanup:
2006 free(url);
2007 return ret;
2008 }
2009
2010 void release_http_pack_request(struct http_pack_request *preq)
2011 {
2012 if (preq->packfile != NULL) {
2013 fclose(preq->packfile);
2014 preq->packfile = NULL;
2015 }
2016 preq->slot = NULL;
2017 free(preq->url);
2018 free(preq);
2019 }
2020
2021 int finish_http_pack_request(struct http_pack_request *preq)
2022 {
2023 struct packed_git **lst;
2024 struct packed_git *p = preq->target;
2025 char *tmp_idx;
2026 size_t len;
2027 struct child_process ip = CHILD_PROCESS_INIT;
2028 const char *ip_argv[8];
2029
2030 close_pack_index(p);
2031
2032 fclose(preq->packfile);
2033 preq->packfile = NULL;
2034
2035 lst = preq->lst;
2036 while (*lst != p)
2037 lst = &((*lst)->next);
2038 *lst = (*lst)->next;
2039
2040 if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
2041 die("BUG: pack tmpfile does not end in .pack.temp?");
2042 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
2043
2044 ip_argv[0] = "index-pack";
2045 ip_argv[1] = "-o";
2046 ip_argv[2] = tmp_idx;
2047 ip_argv[3] = preq->tmpfile;
2048 ip_argv[4] = NULL;
2049
2050 ip.argv = ip_argv;
2051 ip.git_cmd = 1;
2052 ip.no_stdin = 1;
2053 ip.no_stdout = 1;
2054
2055 if (run_command(&ip)) {
2056 unlink(preq->tmpfile);
2057 unlink(tmp_idx);
2058 free(tmp_idx);
2059 return -1;
2060 }
2061
2062 unlink(sha1_pack_index_name(p->sha1));
2063
2064 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
2065 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
2066 free(tmp_idx);
2067 return -1;
2068 }
2069
2070 install_packed_git(p);
2071 free(tmp_idx);
2072 return 0;
2073 }
2074
2075 struct http_pack_request *new_http_pack_request(
2076 struct packed_git *target, const char *base_url)
2077 {
2078 off_t prev_posn = 0;
2079 struct strbuf buf = STRBUF_INIT;
2080 struct http_pack_request *preq;
2081
2082 preq = xcalloc(1, sizeof(*preq));
2083 preq->target = target;
2084
2085 end_url_with_slash(&buf, base_url);
2086 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2087 sha1_to_hex(target->sha1));
2088 preq->url = strbuf_detach(&buf, NULL);
2089
2090 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
2091 sha1_pack_name(target->sha1));
2092 preq->packfile = fopen(preq->tmpfile, "a");
2093 if (!preq->packfile) {
2094 error("Unable to open local file %s for pack",
2095 preq->tmpfile);
2096 goto abort;
2097 }
2098
2099 preq->slot = get_active_slot();
2100 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2101 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2102 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2103 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2104 no_pragma_header);
2105
2106 /*
2107 * If there is data present from a previous transfer attempt,
2108 * resume where it left off
2109 */
2110 prev_posn = ftello(preq->packfile);
2111 if (prev_posn>0) {
2112 if (http_is_verbose)
2113 fprintf(stderr,
2114 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2115 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
2116 http_opt_request_remainder(preq->slot->curl, prev_posn);
2117 }
2118
2119 return preq;
2120
2121 abort:
2122 free(preq->url);
2123 free(preq);
2124 return NULL;
2125 }
2126
2127 /* Helpers for fetching objects (loose) */
2128 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2129 void *data)
2130 {
2131 unsigned char expn[4096];
2132 size_t size = eltsize * nmemb;
2133 int posn = 0;
2134 struct http_object_request *freq = data;
2135 struct active_request_slot *slot = freq->slot;
2136
2137 if (slot) {
2138 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2139 &slot->http_code);
2140 if (c != CURLE_OK)
2141 die("BUG: curl_easy_getinfo for HTTP code failed: %s",
2142 curl_easy_strerror(c));
2143 if (slot->http_code >= 300)
2144 return size;
2145 }
2146
2147 do {
2148 ssize_t retval = xwrite(freq->localfile,
2149 (char *) ptr + posn, size - posn);
2150 if (retval < 0)
2151 return posn;
2152 posn += retval;
2153 } while (posn < size);
2154
2155 freq->stream.avail_in = size;
2156 freq->stream.next_in = (void *)ptr;
2157 do {
2158 freq->stream.next_out = expn;
2159 freq->stream.avail_out = sizeof(expn);
2160 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2161 git_SHA1_Update(&freq->c, expn,
2162 sizeof(expn) - freq->stream.avail_out);
2163 } while (freq->stream.avail_in && freq->zret == Z_OK);
2164 return size;
2165 }
2166
2167 struct http_object_request *new_http_object_request(const char *base_url,
2168 unsigned char *sha1)
2169 {
2170 char *hex = sha1_to_hex(sha1);
2171 const char *filename;
2172 char prevfile[PATH_MAX];
2173 int prevlocal;
2174 char prev_buf[PREV_BUF_SIZE];
2175 ssize_t prev_read = 0;
2176 off_t prev_posn = 0;
2177 struct http_object_request *freq;
2178
2179 freq = xcalloc(1, sizeof(*freq));
2180 hashcpy(freq->sha1, sha1);
2181 freq->localfile = -1;
2182
2183 filename = sha1_file_name(sha1);
2184 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2185 "%s.temp", filename);
2186
2187 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
2188 unlink_or_warn(prevfile);
2189 rename(freq->tmpfile, prevfile);
2190 unlink_or_warn(freq->tmpfile);
2191
2192 if (freq->localfile != -1)
2193 error("fd leakage in start: %d", freq->localfile);
2194 freq->localfile = open(freq->tmpfile,
2195 O_WRONLY | O_CREAT | O_EXCL, 0666);
2196 /*
2197 * This could have failed due to the "lazy directory creation";
2198 * try to mkdir the last path component.
2199 */
2200 if (freq->localfile < 0 && errno == ENOENT) {
2201 char *dir = strrchr(freq->tmpfile, '/');
2202 if (dir) {
2203 *dir = 0;
2204 mkdir(freq->tmpfile, 0777);
2205 *dir = '/';
2206 }
2207 freq->localfile = open(freq->tmpfile,
2208 O_WRONLY | O_CREAT | O_EXCL, 0666);
2209 }
2210
2211 if (freq->localfile < 0) {
2212 error_errno("Couldn't create temporary file %s", freq->tmpfile);
2213 goto abort;
2214 }
2215
2216 git_inflate_init(&freq->stream);
2217
2218 git_SHA1_Init(&freq->c);
2219
2220 freq->url = get_remote_object_url(base_url, hex, 0);
2221
2222 /*
2223 * If a previous temp file is present, process what was already
2224 * fetched.
2225 */
2226 prevlocal = open(prevfile, O_RDONLY);
2227 if (prevlocal != -1) {
2228 do {
2229 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2230 if (prev_read>0) {
2231 if (fwrite_sha1_file(prev_buf,
2232 1,
2233 prev_read,
2234 freq) == prev_read) {
2235 prev_posn += prev_read;
2236 } else {
2237 prev_read = -1;
2238 }
2239 }
2240 } while (prev_read > 0);
2241 close(prevlocal);
2242 }
2243 unlink_or_warn(prevfile);
2244
2245 /*
2246 * Reset inflate/SHA1 if there was an error reading the previous temp
2247 * file; also rewind to the beginning of the local file.
2248 */
2249 if (prev_read == -1) {
2250 memset(&freq->stream, 0, sizeof(freq->stream));
2251 git_inflate_init(&freq->stream);
2252 git_SHA1_Init(&freq->c);
2253 if (prev_posn>0) {
2254 prev_posn = 0;
2255 lseek(freq->localfile, 0, SEEK_SET);
2256 if (ftruncate(freq->localfile, 0) < 0) {
2257 error_errno("Couldn't truncate temporary file %s",
2258 freq->tmpfile);
2259 goto abort;
2260 }
2261 }
2262 }
2263
2264 freq->slot = get_active_slot();
2265
2266 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2267 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2268 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2269 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2270 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2271 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2272
2273 /*
2274 * If we have successfully processed data from a previous fetch
2275 * attempt, only fetch the data we don't already have.
2276 */
2277 if (prev_posn>0) {
2278 if (http_is_verbose)
2279 fprintf(stderr,
2280 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2281 hex, (uintmax_t)prev_posn);
2282 http_opt_request_remainder(freq->slot->curl, prev_posn);
2283 }
2284
2285 return freq;
2286
2287 abort:
2288 free(freq->url);
2289 free(freq);
2290 return NULL;
2291 }
2292
2293 void process_http_object_request(struct http_object_request *freq)
2294 {
2295 if (freq->slot == NULL)
2296 return;
2297 freq->curl_result = freq->slot->curl_result;
2298 freq->http_code = freq->slot->http_code;
2299 freq->slot = NULL;
2300 }
2301
2302 int finish_http_object_request(struct http_object_request *freq)
2303 {
2304 struct stat st;
2305
2306 close(freq->localfile);
2307 freq->localfile = -1;
2308
2309 process_http_object_request(freq);
2310
2311 if (freq->http_code == 416) {
2312 warning("requested range invalid; we may already have all the data.");
2313 } else if (freq->curl_result != CURLE_OK) {
2314 if (stat(freq->tmpfile, &st) == 0)
2315 if (st.st_size == 0)
2316 unlink_or_warn(freq->tmpfile);
2317 return -1;
2318 }
2319
2320 git_inflate_end(&freq->stream);
2321 git_SHA1_Final(freq->real_sha1, &freq->c);
2322 if (freq->zret != Z_STREAM_END) {
2323 unlink_or_warn(freq->tmpfile);
2324 return -1;
2325 }
2326 if (hashcmp(freq->sha1, freq->real_sha1)) {
2327 unlink_or_warn(freq->tmpfile);
2328 return -1;
2329 }
2330 freq->rename =
2331 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2332
2333 return freq->rename;
2334 }
2335
2336 void abort_http_object_request(struct http_object_request *freq)
2337 {
2338 unlink_or_warn(freq->tmpfile);
2339
2340 release_http_object_request(freq);
2341 }
2342
2343 void release_http_object_request(struct http_object_request *freq)
2344 {
2345 if (freq->localfile != -1) {
2346 close(freq->localfile);
2347 freq->localfile = -1;
2348 }
2349 if (freq->url != NULL) {
2350 FREE_AND_NULL(freq->url);
2351 }
2352 if (freq->slot != NULL) {
2353 freq->slot->callback_func = NULL;
2354 freq->slot->callback_data = NULL;
2355 release_active_slot(freq->slot);
2356 freq->slot = NULL;
2357 }
2358 }
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