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fsck: support referenced promisor objects
[alt-git.git] / http.c
blob713525f38ed3f254aed2b0dd65fece7972444072
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
16 static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
17 #if LIBCURL_VERSION_NUM >= 0x070a08
18 long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
19 #else
20 long int git_curl_ipresolve;
21 #endif
22 int active_requests;
23 int http_is_verbose;
24 ssize_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
30 static int min_curl_sessions = 1;
31 static int curl_session_count;
32 #ifdef USE_CURL_MULTI
33 static int max_requests = -1;
34 static CURLM *curlm;
35 #endif
36 #ifndef NO_CURL_EASY_DUPHANDLE
37 static CURL *curl_default;
38 #endif
39
40 #define PREV_BUF_SIZE 4096
41
42 char curl_errorstr[CURL_ERROR_SIZE];
43
44 static int curl_ssl_verify = -1;
45 static int curl_ssl_try;
46 static const char *ssl_cert;
47 static const char *ssl_cipherlist;
48 static const char *ssl_version;
49 static 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
63 static const char *ssl_key;
64 #endif
65 #if LIBCURL_VERSION_NUM >= 0x070908
66 static const char *ssl_capath;
67 #endif
68 #if LIBCURL_VERSION_NUM >= 0x072c00
69 static const char *ssl_pinnedkey;
70 #endif
71 static const char *ssl_cainfo;
72 static long curl_low_speed_limit = -1;
73 static long curl_low_speed_time = -1;
74 static int curl_ftp_no_epsv;
75 static const char *curl_http_proxy;
76 static const char *curl_no_proxy;
77 static const char *http_proxy_authmethod;
78 static 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
96 static const char *curl_deleg;
97 static 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
107 static struct credential proxy_auth = CREDENTIAL_INIT;
108 static const char *curl_proxyuserpwd;
109 static const char *curl_cookie_file;
110 static int curl_save_cookies;
111 struct credential http_auth = CREDENTIAL_INIT;
112 static int http_proactive_auth;
113 static const char *user_agent;
114 static int curl_empty_auth = -1;
115
116 enum 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
126 static struct credential cert_auth = CREDENTIAL_INIT;
127 static int ssl_cert_password_required;
128 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
129 static unsigned long http_auth_methods = CURLAUTH_ANY;
130 static int http_auth_methods_restricted;
131 /* Modes for which empty_auth cannot actually help us. */
132 static 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
140 static struct curl_slist *pragma_header;
141 static struct curl_slist *no_pragma_header;
142 static struct curl_slist *extra_http_headers;
143
144 static struct active_request_slot *active_queue_head;
145
146 static char *cached_accept_language;
147
148 size_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
162 curlioerr 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
180 size_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
189 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
190 {
191 return eltsize * nmemb;
192 }
193
194 static void closedown_active_slot(struct active_request_slot *slot)
195 {
196 active_requests--;
197 slot->in_use = 0;
198 }
199
200 static 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
228 static 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
236 static 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
265 static 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
400 static 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
427 static 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 */
458 static void var_override(const char **var, char *value)
459 {
460 if (value) {
461 free((void *)*var);
462 *var = xstrdup(value);
463 }
464 }
465
466 static 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
484 static 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
515 static 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
529 static void set_curl_keepalive(CURL *c)
530 {
531 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
532 }
533
534 #elif LIBCURL_VERSION_NUM >= 0x071000
535 static 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
551 static void set_curl_keepalive(CURL *c)
552 {
553 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
554 }
555
556 #else
557 static void set_curl_keepalive(CURL *c)
558 {
559 /* not supported on older curl versions */
560 }
561 #endif
562
563 static 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
580 static 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
605 static 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
633 static 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
673 void 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
683 static 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
700 static 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 (strstr(curl_http_proxy, "://"))
869 credential_from_url(&proxy_auth, curl_http_proxy);
870 else {
871 struct strbuf url = STRBUF_INIT;
872 strbuf_addf(&url, "http://%s", curl_http_proxy);
873 credential_from_url(&proxy_auth, url.buf);
874 strbuf_release(&url);
875 }
876
877 if (!proxy_auth.host)
878 die("Invalid proxy URL '%s'", curl_http_proxy);
879
880 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
881 #if LIBCURL_VERSION_NUM >= 0x071304
882 var_override(&curl_no_proxy, getenv("NO_PROXY"));
883 var_override(&curl_no_proxy, getenv("no_proxy"));
884 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
885 #endif
886 }
887 init_curl_proxy_auth(result);
888
889 set_curl_keepalive(result);
890
891 return result;
892 }
893
894 static void set_from_env(const char **var, const char *envname)
895 {
896 const char *val = getenv(envname);
897 if (val)
898 *var = val;
899 }
900
901 void http_init(struct remote *remote, const char *url, int proactive_auth)
902 {
903 char *low_speed_limit;
904 char *low_speed_time;
905 char *normalized_url;
906 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
907
908 config.section = "http";
909 config.key = NULL;
910 config.collect_fn = http_options;
911 config.cascade_fn = git_default_config;
912 config.cb = NULL;
913
914 http_is_verbose = 0;
915 normalized_url = url_normalize(url, &config.url);
916
917 git_config(urlmatch_config_entry, &config);
918 free(normalized_url);
919
920 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
921 die("curl_global_init failed");
922
923 http_proactive_auth = proactive_auth;
924
925 if (remote && remote->http_proxy)
926 curl_http_proxy = xstrdup(remote->http_proxy);
927
928 if (remote)
929 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
930
931 pragma_header = curl_slist_append(http_copy_default_headers(),
932 "Pragma: no-cache");
933 no_pragma_header = curl_slist_append(http_copy_default_headers(),
934 "Pragma:");
935
936 #ifdef USE_CURL_MULTI
937 {
938 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
939 if (http_max_requests != NULL)
940 max_requests = atoi(http_max_requests);
941 }
942
943 curlm = curl_multi_init();
944 if (!curlm)
945 die("curl_multi_init failed");
946 #endif
947
948 if (getenv("GIT_SSL_NO_VERIFY"))
949 curl_ssl_verify = 0;
950
951 set_from_env(&ssl_cert, "GIT_SSL_CERT");
952 #if LIBCURL_VERSION_NUM >= 0x070903
953 set_from_env(&ssl_key, "GIT_SSL_KEY");
954 #endif
955 #if LIBCURL_VERSION_NUM >= 0x070908
956 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
957 #endif
958 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
959
960 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
961
962 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
963 if (low_speed_limit != NULL)
964 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
965 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
966 if (low_speed_time != NULL)
967 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
968
969 if (curl_ssl_verify == -1)
970 curl_ssl_verify = 1;
971
972 curl_session_count = 0;
973 #ifdef USE_CURL_MULTI
974 if (max_requests < 1)
975 max_requests = DEFAULT_MAX_REQUESTS;
976 #endif
977
978 if (getenv("GIT_CURL_FTP_NO_EPSV"))
979 curl_ftp_no_epsv = 1;
980
981 if (url) {
982 credential_from_url(&http_auth, url);
983 if (!ssl_cert_password_required &&
984 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
985 starts_with(url, "https://"))
986 ssl_cert_password_required = 1;
987 }
988
989 #ifndef NO_CURL_EASY_DUPHANDLE
990 curl_default = get_curl_handle();
991 #endif
992 }
993
994 void http_cleanup(void)
995 {
996 struct active_request_slot *slot = active_queue_head;
997
998 while (slot != NULL) {
999 struct active_request_slot *next = slot->next;
1000 if (slot->curl != NULL) {
1001 xmulti_remove_handle(slot);
1002 curl_easy_cleanup(slot->curl);
1003 }
1004 free(slot);
1005 slot = next;
1006 }
1007 active_queue_head = NULL;
1008
1009 #ifndef NO_CURL_EASY_DUPHANDLE
1010 curl_easy_cleanup(curl_default);
1011 #endif
1012
1013 #ifdef USE_CURL_MULTI
1014 curl_multi_cleanup(curlm);
1015 #endif
1016 curl_global_cleanup();
1017
1018 curl_slist_free_all(extra_http_headers);
1019 extra_http_headers = NULL;
1020
1021 curl_slist_free_all(pragma_header);
1022 pragma_header = NULL;
1023
1024 curl_slist_free_all(no_pragma_header);
1025 no_pragma_header = NULL;
1026
1027 if (curl_http_proxy) {
1028 free((void *)curl_http_proxy);
1029 curl_http_proxy = NULL;
1030 }
1031
1032 if (proxy_auth.password) {
1033 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1034 FREE_AND_NULL(proxy_auth.password);
1035 }
1036
1037 free((void *)curl_proxyuserpwd);
1038 curl_proxyuserpwd = NULL;
1039
1040 free((void *)http_proxy_authmethod);
1041 http_proxy_authmethod = NULL;
1042
1043 if (cert_auth.password != NULL) {
1044 memset(cert_auth.password, 0, strlen(cert_auth.password));
1045 FREE_AND_NULL(cert_auth.password);
1046 }
1047 ssl_cert_password_required = 0;
1048
1049 FREE_AND_NULL(cached_accept_language);
1050 }
1051
1052 struct active_request_slot *get_active_slot(void)
1053 {
1054 struct active_request_slot *slot = active_queue_head;
1055 struct active_request_slot *newslot;
1056
1057 #ifdef USE_CURL_MULTI
1058 int num_transfers;
1059
1060 /* Wait for a slot to open up if the queue is full */
1061 while (active_requests >= max_requests) {
1062 curl_multi_perform(curlm, &num_transfers);
1063 if (num_transfers < active_requests)
1064 process_curl_messages();
1065 }
1066 #endif
1067
1068 while (slot != NULL && slot->in_use)
1069 slot = slot->next;
1070
1071 if (slot == NULL) {
1072 newslot = xmalloc(sizeof(*newslot));
1073 newslot->curl = NULL;
1074 newslot->in_use = 0;
1075 newslot->next = NULL;
1076
1077 slot = active_queue_head;
1078 if (slot == NULL) {
1079 active_queue_head = newslot;
1080 } else {
1081 while (slot->next != NULL)
1082 slot = slot->next;
1083 slot->next = newslot;
1084 }
1085 slot = newslot;
1086 }
1087
1088 if (slot->curl == NULL) {
1089 #ifdef NO_CURL_EASY_DUPHANDLE
1090 slot->curl = get_curl_handle();
1091 #else
1092 slot->curl = curl_easy_duphandle(curl_default);
1093 #endif
1094 curl_session_count++;
1095 }
1096
1097 active_requests++;
1098 slot->in_use = 1;
1099 slot->results = NULL;
1100 slot->finished = NULL;
1101 slot->callback_data = NULL;
1102 slot->callback_func = NULL;
1103 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1104 if (curl_save_cookies)
1105 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1106 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1107 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1108 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1109 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1110 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1111 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1112 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1113 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1114 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1115 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1116
1117 /*
1118 * Default following to off unless "ALWAYS" is configured; this gives
1119 * callers a sane starting point, and they can tweak for individual
1120 * HTTP_FOLLOW_* cases themselves.
1121 */
1122 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1123 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1124 else
1125 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1126
1127 #if LIBCURL_VERSION_NUM >= 0x070a08
1128 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1129 #endif
1130 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1131 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1132 #endif
1133 if (http_auth.password || curl_empty_auth_enabled())
1134 init_curl_http_auth(slot->curl);
1135
1136 return slot;
1137 }
1138
1139 int start_active_slot(struct active_request_slot *slot)
1140 {
1141 #ifdef USE_CURL_MULTI
1142 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1143 int num_transfers;
1144
1145 if (curlm_result != CURLM_OK &&
1146 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1147 warning("curl_multi_add_handle failed: %s",
1148 curl_multi_strerror(curlm_result));
1149 active_requests--;
1150 slot->in_use = 0;
1151 return 0;
1152 }
1153
1154 /*
1155 * We know there must be something to do, since we just added
1156 * something.
1157 */
1158 curl_multi_perform(curlm, &num_transfers);
1159 #endif
1160 return 1;
1161 }
1162
1163 #ifdef USE_CURL_MULTI
1164 struct fill_chain {
1165 void *data;
1166 int (*fill)(void *);
1167 struct fill_chain *next;
1168 };
1169
1170 static struct fill_chain *fill_cfg;
1171
1172 void add_fill_function(void *data, int (*fill)(void *))
1173 {
1174 struct fill_chain *new = xmalloc(sizeof(*new));
1175 struct fill_chain **linkp = &fill_cfg;
1176 new->data = data;
1177 new->fill = fill;
1178 new->next = NULL;
1179 while (*linkp)
1180 linkp = &(*linkp)->next;
1181 *linkp = new;
1182 }
1183
1184 void fill_active_slots(void)
1185 {
1186 struct active_request_slot *slot = active_queue_head;
1187
1188 while (active_requests < max_requests) {
1189 struct fill_chain *fill;
1190 for (fill = fill_cfg; fill; fill = fill->next)
1191 if (fill->fill(fill->data))
1192 break;
1193
1194 if (!fill)
1195 break;
1196 }
1197
1198 while (slot != NULL) {
1199 if (!slot->in_use && slot->curl != NULL
1200 && curl_session_count > min_curl_sessions) {
1201 curl_easy_cleanup(slot->curl);
1202 slot->curl = NULL;
1203 curl_session_count--;
1204 }
1205 slot = slot->next;
1206 }
1207 }
1208
1209 void step_active_slots(void)
1210 {
1211 int num_transfers;
1212 CURLMcode curlm_result;
1213
1214 do {
1215 curlm_result = curl_multi_perform(curlm, &num_transfers);
1216 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1217 if (num_transfers < active_requests) {
1218 process_curl_messages();
1219 fill_active_slots();
1220 }
1221 }
1222 #endif
1223
1224 void run_active_slot(struct active_request_slot *slot)
1225 {
1226 #ifdef USE_CURL_MULTI
1227 fd_set readfds;
1228 fd_set writefds;
1229 fd_set excfds;
1230 int max_fd;
1231 struct timeval select_timeout;
1232 int finished = 0;
1233
1234 slot->finished = &finished;
1235 while (!finished) {
1236 step_active_slots();
1237
1238 if (slot->in_use) {
1239 #if LIBCURL_VERSION_NUM >= 0x070f04
1240 long curl_timeout;
1241 curl_multi_timeout(curlm, &curl_timeout);
1242 if (curl_timeout == 0) {
1243 continue;
1244 } else if (curl_timeout == -1) {
1245 select_timeout.tv_sec = 0;
1246 select_timeout.tv_usec = 50000;
1247 } else {
1248 select_timeout.tv_sec = curl_timeout / 1000;
1249 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1250 }
1251 #else
1252 select_timeout.tv_sec = 0;
1253 select_timeout.tv_usec = 50000;
1254 #endif
1255
1256 max_fd = -1;
1257 FD_ZERO(&readfds);
1258 FD_ZERO(&writefds);
1259 FD_ZERO(&excfds);
1260 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1261
1262 /*
1263 * It can happen that curl_multi_timeout returns a pathologically
1264 * long timeout when curl_multi_fdset returns no file descriptors
1265 * to read. See commit message for more details.
1266 */
1267 if (max_fd < 0 &&
1268 (select_timeout.tv_sec > 0 ||
1269 select_timeout.tv_usec > 50000)) {
1270 select_timeout.tv_sec = 0;
1271 select_timeout.tv_usec = 50000;
1272 }
1273
1274 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1275 }
1276 }
1277 #else
1278 while (slot->in_use) {
1279 slot->curl_result = curl_easy_perform(slot->curl);
1280 finish_active_slot(slot);
1281 }
1282 #endif
1283 }
1284
1285 static void release_active_slot(struct active_request_slot *slot)
1286 {
1287 closedown_active_slot(slot);
1288 if (slot->curl) {
1289 xmulti_remove_handle(slot);
1290 if (curl_session_count > min_curl_sessions) {
1291 curl_easy_cleanup(slot->curl);
1292 slot->curl = NULL;
1293 curl_session_count--;
1294 }
1295 }
1296 #ifdef USE_CURL_MULTI
1297 fill_active_slots();
1298 #endif
1299 }
1300
1301 void finish_all_active_slots(void)
1302 {
1303 struct active_request_slot *slot = active_queue_head;
1304
1305 while (slot != NULL)
1306 if (slot->in_use) {
1307 run_active_slot(slot);
1308 slot = active_queue_head;
1309 } else {
1310 slot = slot->next;
1311 }
1312 }
1313
1314 /* Helpers for modifying and creating URLs */
1315 static inline int needs_quote(int ch)
1316 {
1317 if (((ch >= 'A') && (ch <= 'Z'))
1318 || ((ch >= 'a') && (ch <= 'z'))
1319 || ((ch >= '0') && (ch <= '9'))
1320 || (ch == '/')
1321 || (ch == '-')
1322 || (ch == '.'))
1323 return 0;
1324 return 1;
1325 }
1326
1327 static char *quote_ref_url(const char *base, const char *ref)
1328 {
1329 struct strbuf buf = STRBUF_INIT;
1330 const char *cp;
1331 int ch;
1332
1333 end_url_with_slash(&buf, base);
1334
1335 for (cp = ref; (ch = *cp) != 0; cp++)
1336 if (needs_quote(ch))
1337 strbuf_addf(&buf, "%%%02x", ch);
1338 else
1339 strbuf_addch(&buf, *cp);
1340
1341 return strbuf_detach(&buf, NULL);
1342 }
1343
1344 void append_remote_object_url(struct strbuf *buf, const char *url,
1345 const char *hex,
1346 int only_two_digit_prefix)
1347 {
1348 end_url_with_slash(buf, url);
1349
1350 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1351 if (!only_two_digit_prefix)
1352 strbuf_addstr(buf, hex + 2);
1353 }
1354
1355 char *get_remote_object_url(const char *url, const char *hex,
1356 int only_two_digit_prefix)
1357 {
1358 struct strbuf buf = STRBUF_INIT;
1359 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1360 return strbuf_detach(&buf, NULL);
1361 }
1362
1363 static int handle_curl_result(struct slot_results *results)
1364 {
1365 /*
1366 * If we see a failing http code with CURLE_OK, we have turned off
1367 * FAILONERROR (to keep the server's custom error response), and should
1368 * translate the code into failure here.
1369 *
1370 * Likewise, if we see a redirect (30x code), that means we turned off
1371 * redirect-following, and we should treat the result as an error.
1372 */
1373 if (results->curl_result == CURLE_OK &&
1374 results->http_code >= 300) {
1375 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1376 /*
1377 * Normally curl will already have put the "reason phrase"
1378 * from the server into curl_errorstr; unfortunately without
1379 * FAILONERROR it is lost, so we can give only the numeric
1380 * status code.
1381 */
1382 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1383 "The requested URL returned error: %ld",
1384 results->http_code);
1385 }
1386
1387 if (results->curl_result == CURLE_OK) {
1388 credential_approve(&http_auth);
1389 if (proxy_auth.password)
1390 credential_approve(&proxy_auth);
1391 return HTTP_OK;
1392 } else if (missing_target(results))
1393 return HTTP_MISSING_TARGET;
1394 else if (results->http_code == 401) {
1395 if (http_auth.username && http_auth.password) {
1396 credential_reject(&http_auth);
1397 return HTTP_NOAUTH;
1398 } else {
1399 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1400 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1401 if (results->auth_avail) {
1402 http_auth_methods &= results->auth_avail;
1403 http_auth_methods_restricted = 1;
1404 }
1405 #endif
1406 return HTTP_REAUTH;
1407 }
1408 } else {
1409 if (results->http_connectcode == 407)
1410 credential_reject(&proxy_auth);
1411 #if LIBCURL_VERSION_NUM >= 0x070c00
1412 if (!curl_errorstr[0])
1413 strlcpy(curl_errorstr,
1414 curl_easy_strerror(results->curl_result),
1415 sizeof(curl_errorstr));
1416 #endif
1417 return HTTP_ERROR;
1418 }
1419 }
1420
1421 int run_one_slot(struct active_request_slot *slot,
1422 struct slot_results *results)
1423 {
1424 slot->results = results;
1425 if (!start_active_slot(slot)) {
1426 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1427 "failed to start HTTP request");
1428 return HTTP_START_FAILED;
1429 }
1430
1431 run_active_slot(slot);
1432 return handle_curl_result(results);
1433 }
1434
1435 struct curl_slist *http_copy_default_headers(void)
1436 {
1437 struct curl_slist *headers = NULL, *h;
1438
1439 for (h = extra_http_headers; h; h = h->next)
1440 headers = curl_slist_append(headers, h->data);
1441
1442 return headers;
1443 }
1444
1445 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1446 {
1447 char *ptr;
1448 CURLcode ret;
1449
1450 strbuf_reset(buf);
1451 ret = curl_easy_getinfo(curl, info, &ptr);
1452 if (!ret && ptr)
1453 strbuf_addstr(buf, ptr);
1454 return ret;
1455 }
1456
1457 /*
1458 * Check for and extract a content-type parameter. "raw"
1459 * should be positioned at the start of the potential
1460 * parameter, with any whitespace already removed.
1461 *
1462 * "name" is the name of the parameter. The value is appended
1463 * to "out".
1464 */
1465 static int extract_param(const char *raw, const char *name,
1466 struct strbuf *out)
1467 {
1468 size_t len = strlen(name);
1469
1470 if (strncasecmp(raw, name, len))
1471 return -1;
1472 raw += len;
1473
1474 if (*raw != '=')
1475 return -1;
1476 raw++;
1477
1478 while (*raw && !isspace(*raw) && *raw != ';')
1479 strbuf_addch(out, *raw++);
1480 return 0;
1481 }
1482
1483 /*
1484 * Extract a normalized version of the content type, with any
1485 * spaces suppressed, all letters lowercased, and no trailing ";"
1486 * or parameters.
1487 *
1488 * Note that we will silently remove even invalid whitespace. For
1489 * example, "text / plain" is specifically forbidden by RFC 2616,
1490 * but "text/plain" is the only reasonable output, and this keeps
1491 * our code simple.
1492 *
1493 * If the "charset" argument is not NULL, store the value of any
1494 * charset parameter there.
1495 *
1496 * Example:
1497 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1498 * "text / plain" -> "text/plain"
1499 */
1500 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1501 struct strbuf *charset)
1502 {
1503 const char *p;
1504
1505 strbuf_reset(type);
1506 strbuf_grow(type, raw->len);
1507 for (p = raw->buf; *p; p++) {
1508 if (isspace(*p))
1509 continue;
1510 if (*p == ';') {
1511 p++;
1512 break;
1513 }
1514 strbuf_addch(type, tolower(*p));
1515 }
1516
1517 if (!charset)
1518 return;
1519
1520 strbuf_reset(charset);
1521 while (*p) {
1522 while (isspace(*p) || *p == ';')
1523 p++;
1524 if (!extract_param(p, "charset", charset))
1525 return;
1526 while (*p && !isspace(*p))
1527 p++;
1528 }
1529
1530 if (!charset->len && starts_with(type->buf, "text/"))
1531 strbuf_addstr(charset, "ISO-8859-1");
1532 }
1533
1534 static void write_accept_language(struct strbuf *buf)
1535 {
1536 /*
1537 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1538 * that, q-value will be smaller than 0.001, the minimum q-value the
1539 * HTTP specification allows. See
1540 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1541 */
1542 const int MAX_DECIMAL_PLACES = 3;
1543 const int MAX_LANGUAGE_TAGS = 1000;
1544 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1545 char **language_tags = NULL;
1546 int num_langs = 0;
1547 const char *s = get_preferred_languages();
1548 int i;
1549 struct strbuf tag = STRBUF_INIT;
1550
1551 /* Don't add Accept-Language header if no language is preferred. */
1552 if (!s)
1553 return;
1554
1555 /*
1556 * Split the colon-separated string of preferred languages into
1557 * language_tags array.
1558 */
1559 do {
1560 /* collect language tag */
1561 for (; *s && (isalnum(*s) || *s == '_'); s++)
1562 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1563
1564 /* skip .codeset, @modifier and any other unnecessary parts */
1565 while (*s && *s != ':')
1566 s++;
1567
1568 if (tag.len) {
1569 num_langs++;
1570 REALLOC_ARRAY(language_tags, num_langs);
1571 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1572 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1573 break;
1574 }
1575 } while (*s++);
1576
1577 /* write Accept-Language header into buf */
1578 if (num_langs) {
1579 int last_buf_len = 0;
1580 int max_q;
1581 int decimal_places;
1582 char q_format[32];
1583
1584 /* add '*' */
1585 REALLOC_ARRAY(language_tags, num_langs + 1);
1586 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1587
1588 /* compute decimal_places */
1589 for (max_q = 1, decimal_places = 0;
1590 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1591 decimal_places++, max_q *= 10)
1592 ;
1593
1594 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1595
1596 strbuf_addstr(buf, "Accept-Language: ");
1597
1598 for (i = 0; i < num_langs; i++) {
1599 if (i > 0)
1600 strbuf_addstr(buf, ", ");
1601
1602 strbuf_addstr(buf, language_tags[i]);
1603
1604 if (i > 0)
1605 strbuf_addf(buf, q_format, max_q - i);
1606
1607 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1608 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1609 break;
1610 }
1611
1612 last_buf_len = buf->len;
1613 }
1614 }
1615
1616 /* free language tags -- last one is a static '*' */
1617 for (i = 0; i < num_langs - 1; i++)
1618 free(language_tags[i]);
1619 free(language_tags);
1620 }
1621
1622 /*
1623 * Get an Accept-Language header which indicates user's preferred languages.
1624 *
1625 * Examples:
1626 * LANGUAGE= -> ""
1627 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1628 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1629 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1630 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1631 * LANGUAGE= LANG=C -> ""
1632 */
1633 static const char *get_accept_language(void)
1634 {
1635 if (!cached_accept_language) {
1636 struct strbuf buf = STRBUF_INIT;
1637 write_accept_language(&buf);
1638 if (buf.len > 0)
1639 cached_accept_language = strbuf_detach(&buf, NULL);
1640 }
1641
1642 return cached_accept_language;
1643 }
1644
1645 static void http_opt_request_remainder(CURL *curl, off_t pos)
1646 {
1647 char buf[128];
1648 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1649 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1650 }
1651
1652 /* http_request() targets */
1653 #define HTTP_REQUEST_STRBUF 0
1654 #define HTTP_REQUEST_FILE 1
1655
1656 static int http_request(const char *url,
1657 void *result, int target,
1658 const struct http_get_options *options)
1659 {
1660 struct active_request_slot *slot;
1661 struct slot_results results;
1662 struct curl_slist *headers = http_copy_default_headers();
1663 struct strbuf buf = STRBUF_INIT;
1664 const char *accept_language;
1665 int ret;
1666
1667 slot = get_active_slot();
1668 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1669
1670 if (result == NULL) {
1671 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1672 } else {
1673 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1674 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1675
1676 if (target == HTTP_REQUEST_FILE) {
1677 off_t posn = ftello(result);
1678 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1679 fwrite);
1680 if (posn > 0)
1681 http_opt_request_remainder(slot->curl, posn);
1682 } else
1683 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1684 fwrite_buffer);
1685 }
1686
1687 accept_language = get_accept_language();
1688
1689 if (accept_language)
1690 headers = curl_slist_append(headers, accept_language);
1691
1692 strbuf_addstr(&buf, "Pragma:");
1693 if (options && options->no_cache)
1694 strbuf_addstr(&buf, " no-cache");
1695 if (options && options->keep_error)
1696 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1697 if (options && options->initial_request &&
1698 http_follow_config == HTTP_FOLLOW_INITIAL)
1699 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1700
1701 headers = curl_slist_append(headers, buf.buf);
1702
1703 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1704 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1705 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1706
1707 ret = run_one_slot(slot, &results);
1708
1709 if (options && options->content_type) {
1710 struct strbuf raw = STRBUF_INIT;
1711 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1712 extract_content_type(&raw, options->content_type,
1713 options->charset);
1714 strbuf_release(&raw);
1715 }
1716
1717 if (options && options->effective_url)
1718 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1719 options->effective_url);
1720
1721 curl_slist_free_all(headers);
1722 strbuf_release(&buf);
1723
1724 return ret;
1725 }
1726
1727 /*
1728 * Update the "base" url to a more appropriate value, as deduced by
1729 * redirects seen when requesting a URL starting with "url".
1730 *
1731 * The "asked" parameter is a URL that we asked curl to access, and must begin
1732 * with "base".
1733 *
1734 * The "got" parameter is the URL that curl reported to us as where we ended
1735 * up.
1736 *
1737 * Returns 1 if we updated the base url, 0 otherwise.
1738 *
1739 * Our basic strategy is to compare "base" and "asked" to find the bits
1740 * specific to our request. We then strip those bits off of "got" to yield the
1741 * new base. So for example, if our base is "http://example.com/foo.git",
1742 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1743 * with "https://other.example.com/foo.git/info/refs". We would want the
1744 * new URL to become "https://other.example.com/foo.git".
1745 *
1746 * Note that this assumes a sane redirect scheme. It's entirely possible
1747 * in the example above to end up at a URL that does not even end in
1748 * "info/refs". In such a case we die. There's not much we can do, such a
1749 * scheme is unlikely to represent a real git repository, and failing to
1750 * rewrite the base opens options for malicious redirects to do funny things.
1751 */
1752 static int update_url_from_redirect(struct strbuf *base,
1753 const char *asked,
1754 const struct strbuf *got)
1755 {
1756 const char *tail;
1757 size_t new_len;
1758
1759 if (!strcmp(asked, got->buf))
1760 return 0;
1761
1762 if (!skip_prefix(asked, base->buf, &tail))
1763 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1764 asked, base->buf);
1765
1766 new_len = got->len;
1767 if (!strip_suffix_mem(got->buf, &new_len, tail))
1768 die(_("unable to update url base from redirection:\n"
1769 " asked for: %s\n"
1770 " redirect: %s"),
1771 asked, got->buf);
1772
1773 strbuf_reset(base);
1774 strbuf_add(base, got->buf, new_len);
1775
1776 return 1;
1777 }
1778
1779 static int http_request_reauth(const char *url,
1780 void *result, int target,
1781 struct http_get_options *options)
1782 {
1783 int ret = http_request(url, result, target, options);
1784
1785 if (ret != HTTP_OK && ret != HTTP_REAUTH)
1786 return ret;
1787
1788 if (options && options->effective_url && options->base_url) {
1789 if (update_url_from_redirect(options->base_url,
1790 url, options->effective_url)) {
1791 credential_from_url(&http_auth, options->base_url->buf);
1792 url = options->effective_url->buf;
1793 }
1794 }
1795
1796 if (ret != HTTP_REAUTH)
1797 return ret;
1798
1799 /*
1800 * If we are using KEEP_ERROR, the previous request may have
1801 * put cruft into our output stream; we should clear it out before
1802 * making our next request. We only know how to do this for
1803 * the strbuf case, but that is enough to satisfy current callers.
1804 */
1805 if (options && options->keep_error) {
1806 switch (target) {
1807 case HTTP_REQUEST_STRBUF:
1808 strbuf_reset(result);
1809 break;
1810 default:
1811 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1812 }
1813 }
1814
1815 credential_fill(&http_auth);
1816
1817 return http_request(url, result, target, options);
1818 }
1819
1820 int http_get_strbuf(const char *url,
1821 struct strbuf *result,
1822 struct http_get_options *options)
1823 {
1824 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1825 }
1826
1827 /*
1828 * Downloads a URL and stores the result in the given file.
1829 *
1830 * If a previous interrupted download is detected (i.e. a previous temporary
1831 * file is still around) the download is resumed.
1832 */
1833 static int http_get_file(const char *url, const char *filename,
1834 struct http_get_options *options)
1835 {
1836 int ret;
1837 struct strbuf tmpfile = STRBUF_INIT;
1838 FILE *result;
1839
1840 strbuf_addf(&tmpfile, "%s.temp", filename);
1841 result = fopen(tmpfile.buf, "a");
1842 if (!result) {
1843 error("Unable to open local file %s", tmpfile.buf);
1844 ret = HTTP_ERROR;
1845 goto cleanup;
1846 }
1847
1848 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1849 fclose(result);
1850
1851 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1852 ret = HTTP_ERROR;
1853 cleanup:
1854 strbuf_release(&tmpfile);
1855 return ret;
1856 }
1857
1858 int http_fetch_ref(const char *base, struct ref *ref)
1859 {
1860 struct http_get_options options = {0};
1861 char *url;
1862 struct strbuf buffer = STRBUF_INIT;
1863 int ret = -1;
1864
1865 options.no_cache = 1;
1866
1867 url = quote_ref_url(base, ref->name);
1868 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1869 strbuf_rtrim(&buffer);
1870 if (buffer.len == 40)
1871 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1872 else if (starts_with(buffer.buf, "ref: ")) {
1873 ref->symref = xstrdup(buffer.buf + 5);
1874 ret = 0;
1875 }
1876 }
1877
1878 strbuf_release(&buffer);
1879 free(url);
1880 return ret;
1881 }
1882
1883 /* Helpers for fetching packs */
1884 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1885 {
1886 char *url, *tmp;
1887 struct strbuf buf = STRBUF_INIT;
1888
1889 if (http_is_verbose)
1890 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1891
1892 end_url_with_slash(&buf, base_url);
1893 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1894 url = strbuf_detach(&buf, NULL);
1895
1896 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1897 tmp = strbuf_detach(&buf, NULL);
1898
1899 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1900 error("Unable to get pack index %s", url);
1901 FREE_AND_NULL(tmp);
1902 }
1903
1904 free(url);
1905 return tmp;
1906 }
1907
1908 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1909 unsigned char *sha1, const char *base_url)
1910 {
1911 struct packed_git *new_pack;
1912 char *tmp_idx = NULL;
1913 int ret;
1914
1915 if (has_pack_index(sha1)) {
1916 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1917 if (!new_pack)
1918 return -1; /* parse_pack_index() already issued error message */
1919 goto add_pack;
1920 }
1921
1922 tmp_idx = fetch_pack_index(sha1, base_url);
1923 if (!tmp_idx)
1924 return -1;
1925
1926 new_pack = parse_pack_index(sha1, tmp_idx);
1927 if (!new_pack) {
1928 unlink(tmp_idx);
1929 free(tmp_idx);
1930
1931 return -1; /* parse_pack_index() already issued error message */
1932 }
1933
1934 ret = verify_pack_index(new_pack);
1935 if (!ret) {
1936 close_pack_index(new_pack);
1937 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1938 }
1939 free(tmp_idx);
1940 if (ret)
1941 return -1;
1942
1943 add_pack:
1944 new_pack->next = *packs_head;
1945 *packs_head = new_pack;
1946 return 0;
1947 }
1948
1949 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1950 {
1951 struct http_get_options options = {0};
1952 int ret = 0, i = 0;
1953 char *url, *data;
1954 struct strbuf buf = STRBUF_INIT;
1955 unsigned char sha1[20];
1956
1957 end_url_with_slash(&buf, base_url);
1958 strbuf_addstr(&buf, "objects/info/packs");
1959 url = strbuf_detach(&buf, NULL);
1960
1961 options.no_cache = 1;
1962 ret = http_get_strbuf(url, &buf, &options);
1963 if (ret != HTTP_OK)
1964 goto cleanup;
1965
1966 data = buf.buf;
1967 while (i < buf.len) {
1968 switch (data[i]) {
1969 case 'P':
1970 i++;
1971 if (i + 52 <= buf.len &&
1972 starts_with(data + i, " pack-") &&
1973 starts_with(data + i + 46, ".pack\n")) {
1974 get_sha1_hex(data + i + 6, sha1);
1975 fetch_and_setup_pack_index(packs_head, sha1,
1976 base_url);
1977 i += 51;
1978 break;
1979 }
1980 default:
1981 while (i < buf.len && data[i] != '\n')
1982 i++;
1983 }
1984 i++;
1985 }
1986
1987 cleanup:
1988 free(url);
1989 return ret;
1990 }
1991
1992 void release_http_pack_request(struct http_pack_request *preq)
1993 {
1994 if (preq->packfile != NULL) {
1995 fclose(preq->packfile);
1996 preq->packfile = NULL;
1997 }
1998 preq->slot = NULL;
1999 free(preq->url);
2000 free(preq);
2001 }
2002
2003 int finish_http_pack_request(struct http_pack_request *preq)
2004 {
2005 struct packed_git **lst;
2006 struct packed_git *p = preq->target;
2007 char *tmp_idx;
2008 size_t len;
2009 struct child_process ip = CHILD_PROCESS_INIT;
2010 const char *ip_argv[8];
2011
2012 close_pack_index(p);
2013
2014 fclose(preq->packfile);
2015 preq->packfile = NULL;
2016
2017 lst = preq->lst;
2018 while (*lst != p)
2019 lst = &((*lst)->next);
2020 *lst = (*lst)->next;
2021
2022 if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
2023 die("BUG: pack tmpfile does not end in .pack.temp?");
2024 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
2025
2026 ip_argv[0] = "index-pack";
2027 ip_argv[1] = "-o";
2028 ip_argv[2] = tmp_idx;
2029 ip_argv[3] = preq->tmpfile;
2030 ip_argv[4] = NULL;
2031
2032 ip.argv = ip_argv;
2033 ip.git_cmd = 1;
2034 ip.no_stdin = 1;
2035 ip.no_stdout = 1;
2036
2037 if (run_command(&ip)) {
2038 unlink(preq->tmpfile);
2039 unlink(tmp_idx);
2040 free(tmp_idx);
2041 return -1;
2042 }
2043
2044 unlink(sha1_pack_index_name(p->sha1));
2045
2046 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
2047 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
2048 free(tmp_idx);
2049 return -1;
2050 }
2051
2052 install_packed_git(p);
2053 free(tmp_idx);
2054 return 0;
2055 }
2056
2057 struct http_pack_request *new_http_pack_request(
2058 struct packed_git *target, const char *base_url)
2059 {
2060 off_t prev_posn = 0;
2061 struct strbuf buf = STRBUF_INIT;
2062 struct http_pack_request *preq;
2063
2064 preq = xcalloc(1, sizeof(*preq));
2065 preq->target = target;
2066
2067 end_url_with_slash(&buf, base_url);
2068 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2069 sha1_to_hex(target->sha1));
2070 preq->url = strbuf_detach(&buf, NULL);
2071
2072 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
2073 sha1_pack_name(target->sha1));
2074 preq->packfile = fopen(preq->tmpfile, "a");
2075 if (!preq->packfile) {
2076 error("Unable to open local file %s for pack",
2077 preq->tmpfile);
2078 goto abort;
2079 }
2080
2081 preq->slot = get_active_slot();
2082 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2083 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2084 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2085 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2086 no_pragma_header);
2087
2088 /*
2089 * If there is data present from a previous transfer attempt,
2090 * resume where it left off
2091 */
2092 prev_posn = ftello(preq->packfile);
2093 if (prev_posn>0) {
2094 if (http_is_verbose)
2095 fprintf(stderr,
2096 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2097 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
2098 http_opt_request_remainder(preq->slot->curl, prev_posn);
2099 }
2100
2101 return preq;
2102
2103 abort:
2104 free(preq->url);
2105 free(preq);
2106 return NULL;
2107 }
2108
2109 /* Helpers for fetching objects (loose) */
2110 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2111 void *data)
2112 {
2113 unsigned char expn[4096];
2114 size_t size = eltsize * nmemb;
2115 int posn = 0;
2116 struct http_object_request *freq = data;
2117 struct active_request_slot *slot = freq->slot;
2118
2119 if (slot) {
2120 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2121 &slot->http_code);
2122 if (c != CURLE_OK)
2123 die("BUG: curl_easy_getinfo for HTTP code failed: %s",
2124 curl_easy_strerror(c));
2125 if (slot->http_code >= 300)
2126 return size;
2127 }
2128
2129 do {
2130 ssize_t retval = xwrite(freq->localfile,
2131 (char *) ptr + posn, size - posn);
2132 if (retval < 0)
2133 return posn;
2134 posn += retval;
2135 } while (posn < size);
2136
2137 freq->stream.avail_in = size;
2138 freq->stream.next_in = (void *)ptr;
2139 do {
2140 freq->stream.next_out = expn;
2141 freq->stream.avail_out = sizeof(expn);
2142 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2143 git_SHA1_Update(&freq->c, expn,
2144 sizeof(expn) - freq->stream.avail_out);
2145 } while (freq->stream.avail_in && freq->zret == Z_OK);
2146 return size;
2147 }
2148
2149 struct http_object_request *new_http_object_request(const char *base_url,
2150 unsigned char *sha1)
2151 {
2152 char *hex = sha1_to_hex(sha1);
2153 const char *filename;
2154 char prevfile[PATH_MAX];
2155 int prevlocal;
2156 char prev_buf[PREV_BUF_SIZE];
2157 ssize_t prev_read = 0;
2158 off_t prev_posn = 0;
2159 struct http_object_request *freq;
2160
2161 freq = xcalloc(1, sizeof(*freq));
2162 hashcpy(freq->sha1, sha1);
2163 freq->localfile = -1;
2164
2165 filename = sha1_file_name(sha1);
2166 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2167 "%s.temp", filename);
2168
2169 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
2170 unlink_or_warn(prevfile);
2171 rename(freq->tmpfile, prevfile);
2172 unlink_or_warn(freq->tmpfile);
2173
2174 if (freq->localfile != -1)
2175 error("fd leakage in start: %d", freq->localfile);
2176 freq->localfile = open(freq->tmpfile,
2177 O_WRONLY | O_CREAT | O_EXCL, 0666);
2178 /*
2179 * This could have failed due to the "lazy directory creation";
2180 * try to mkdir the last path component.
2181 */
2182 if (freq->localfile < 0 && errno == ENOENT) {
2183 char *dir = strrchr(freq->tmpfile, '/');
2184 if (dir) {
2185 *dir = 0;
2186 mkdir(freq->tmpfile, 0777);
2187 *dir = '/';
2188 }
2189 freq->localfile = open(freq->tmpfile,
2190 O_WRONLY | O_CREAT | O_EXCL, 0666);
2191 }
2192
2193 if (freq->localfile < 0) {
2194 error_errno("Couldn't create temporary file %s", freq->tmpfile);
2195 goto abort;
2196 }
2197
2198 git_inflate_init(&freq->stream);
2199
2200 git_SHA1_Init(&freq->c);
2201
2202 freq->url = get_remote_object_url(base_url, hex, 0);
2203
2204 /*
2205 * If a previous temp file is present, process what was already
2206 * fetched.
2207 */
2208 prevlocal = open(prevfile, O_RDONLY);
2209 if (prevlocal != -1) {
2210 do {
2211 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2212 if (prev_read>0) {
2213 if (fwrite_sha1_file(prev_buf,
2214 1,
2215 prev_read,
2216 freq) == prev_read) {
2217 prev_posn += prev_read;
2218 } else {
2219 prev_read = -1;
2220 }
2221 }
2222 } while (prev_read > 0);
2223 close(prevlocal);
2224 }
2225 unlink_or_warn(prevfile);
2226
2227 /*
2228 * Reset inflate/SHA1 if there was an error reading the previous temp
2229 * file; also rewind to the beginning of the local file.
2230 */
2231 if (prev_read == -1) {
2232 memset(&freq->stream, 0, sizeof(freq->stream));
2233 git_inflate_init(&freq->stream);
2234 git_SHA1_Init(&freq->c);
2235 if (prev_posn>0) {
2236 prev_posn = 0;
2237 lseek(freq->localfile, 0, SEEK_SET);
2238 if (ftruncate(freq->localfile, 0) < 0) {
2239 error_errno("Couldn't truncate temporary file %s",
2240 freq->tmpfile);
2241 goto abort;
2242 }
2243 }
2244 }
2245
2246 freq->slot = get_active_slot();
2247
2248 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2249 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2250 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2251 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2252 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2253 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2254
2255 /*
2256 * If we have successfully processed data from a previous fetch
2257 * attempt, only fetch the data we don't already have.
2258 */
2259 if (prev_posn>0) {
2260 if (http_is_verbose)
2261 fprintf(stderr,
2262 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2263 hex, (uintmax_t)prev_posn);
2264 http_opt_request_remainder(freq->slot->curl, prev_posn);
2265 }
2266
2267 return freq;
2268
2269 abort:
2270 free(freq->url);
2271 free(freq);
2272 return NULL;
2273 }
2274
2275 void process_http_object_request(struct http_object_request *freq)
2276 {
2277 if (freq->slot == NULL)
2278 return;
2279 freq->curl_result = freq->slot->curl_result;
2280 freq->http_code = freq->slot->http_code;
2281 freq->slot = NULL;
2282 }
2283
2284 int finish_http_object_request(struct http_object_request *freq)
2285 {
2286 struct stat st;
2287
2288 close(freq->localfile);
2289 freq->localfile = -1;
2290
2291 process_http_object_request(freq);
2292
2293 if (freq->http_code == 416) {
2294 warning("requested range invalid; we may already have all the data.");
2295 } else if (freq->curl_result != CURLE_OK) {
2296 if (stat(freq->tmpfile, &st) == 0)
2297 if (st.st_size == 0)
2298 unlink_or_warn(freq->tmpfile);
2299 return -1;
2300 }
2301
2302 git_inflate_end(&freq->stream);
2303 git_SHA1_Final(freq->real_sha1, &freq->c);
2304 if (freq->zret != Z_STREAM_END) {
2305 unlink_or_warn(freq->tmpfile);
2306 return -1;
2307 }
2308 if (hashcmp(freq->sha1, freq->real_sha1)) {
2309 unlink_or_warn(freq->tmpfile);
2310 return -1;
2311 }
2312 freq->rename =
2313 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2314
2315 return freq->rename;
2316 }
2317
2318 void abort_http_object_request(struct http_object_request *freq)
2319 {
2320 unlink_or_warn(freq->tmpfile);
2321
2322 release_http_object_request(freq);
2323 }
2324
2325 void release_http_object_request(struct http_object_request *freq)
2326 {
2327 if (freq->localfile != -1) {
2328 close(freq->localfile);
2329 freq->localfile = -1;
2330 }
2331 if (freq->url != NULL) {
2332 FREE_AND_NULL(freq->url);
2333 }
2334 if (freq->slot != NULL) {
2335 freq->slot->callback_func = NULL;
2336 freq->slot->callback_data = NULL;
2337 release_active_slot(freq->slot);
2338 freq->slot = NULL;
2339 }
2340 }
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