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http: limit redirection to protocol-whitelist
[git/debian.git] / http.c
blob5a57bccea9e762e144a0694128caa7eb45ab4b4d
1 #include "git-compat-util.h"
2 #include "http.h"
3 #include "pack.h"
4 #include "sideband.h"
5 #include "run-command.h"
6 #include "url.h"
7 #include "urlmatch.h"
8 #include "credential.h"
9 #include "version.h"
10 #include "pkt-line.h"
11 #include "transport.h"
12
13 int active_requests;
14 int http_is_verbose;
15 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
16
17 #if LIBCURL_VERSION_NUM >= 0x070a06
18 #define LIBCURL_CAN_HANDLE_AUTH_ANY
19 #endif
20
21 static int min_curl_sessions = 1;
22 static int curl_session_count;
23 #ifdef USE_CURL_MULTI
24 static int max_requests = -1;
25 static CURLM *curlm;
26 #endif
27 #ifndef NO_CURL_EASY_DUPHANDLE
28 static CURL *curl_default;
29 #endif
30
31 #define PREV_BUF_SIZE 4096
32 #define RANGE_HEADER_SIZE 30
33
34 char curl_errorstr[CURL_ERROR_SIZE];
35
36 static int curl_ssl_verify = -1;
37 static int curl_ssl_try;
38 static const char *ssl_cert;
39 #if LIBCURL_VERSION_NUM >= 0x070903
40 static const char *ssl_key;
41 #endif
42 #if LIBCURL_VERSION_NUM >= 0x070908
43 static const char *ssl_capath;
44 #endif
45 static const char *ssl_cainfo;
46 static long curl_low_speed_limit = -1;
47 static long curl_low_speed_time = -1;
48 static int curl_ftp_no_epsv;
49 static const char *curl_http_proxy;
50 static const char *curl_cookie_file;
51 static int curl_save_cookies;
52 struct credential http_auth = CREDENTIAL_INIT;
53 static int http_proactive_auth;
54 static const char *user_agent;
55
56 #if LIBCURL_VERSION_NUM >= 0x071700
57 /* Use CURLOPT_KEYPASSWD as is */
58 #elif LIBCURL_VERSION_NUM >= 0x070903
59 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
60 #else
61 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
62 #endif
63
64 static struct credential cert_auth = CREDENTIAL_INIT;
65 static int ssl_cert_password_required;
66 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
67 static unsigned long http_auth_methods = CURLAUTH_ANY;
68 #endif
69
70 static struct curl_slist *pragma_header;
71 static struct curl_slist *no_pragma_header;
72
73 static struct active_request_slot *active_queue_head;
74
75 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
76 {
77 size_t size = eltsize * nmemb;
78 struct buffer *buffer = buffer_;
79
80 if (size > buffer->buf.len - buffer->posn)
81 size = buffer->buf.len - buffer->posn;
82 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
83 buffer->posn += size;
84
85 return size;
86 }
87
88 #ifndef NO_CURL_IOCTL
89 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
90 {
91 struct buffer *buffer = clientp;
92
93 switch (cmd) {
94 case CURLIOCMD_NOP:
95 return CURLIOE_OK;
96
97 case CURLIOCMD_RESTARTREAD:
98 buffer->posn = 0;
99 return CURLIOE_OK;
100
101 default:
102 return CURLIOE_UNKNOWNCMD;
103 }
104 }
105 #endif
106
107 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
108 {
109 size_t size = eltsize * nmemb;
110 struct strbuf *buffer = buffer_;
111
112 strbuf_add(buffer, ptr, size);
113 return size;
114 }
115
116 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
117 {
118 return eltsize * nmemb;
119 }
120
121 #ifdef USE_CURL_MULTI
122 static void process_curl_messages(void)
123 {
124 int num_messages;
125 struct active_request_slot *slot;
126 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
127
128 while (curl_message != NULL) {
129 if (curl_message->msg == CURLMSG_DONE) {
130 int curl_result = curl_message->data.result;
131 slot = active_queue_head;
132 while (slot != NULL &&
133 slot->curl != curl_message->easy_handle)
134 slot = slot->next;
135 if (slot != NULL) {
136 curl_multi_remove_handle(curlm, slot->curl);
137 slot->curl_result = curl_result;
138 finish_active_slot(slot);
139 } else {
140 fprintf(stderr, "Received DONE message for unknown request!\n");
141 }
142 } else {
143 fprintf(stderr, "Unknown CURL message received: %d\n",
144 (int)curl_message->msg);
145 }
146 curl_message = curl_multi_info_read(curlm, &num_messages);
147 }
148 }
149 #endif
150
151 static int http_options(const char *var, const char *value, void *cb)
152 {
153 if (!strcmp("http.sslverify", var)) {
154 curl_ssl_verify = git_config_bool(var, value);
155 return 0;
156 }
157 if (!strcmp("http.sslcert", var))
158 return git_config_string(&ssl_cert, var, value);
159 #if LIBCURL_VERSION_NUM >= 0x070903
160 if (!strcmp("http.sslkey", var))
161 return git_config_string(&ssl_key, var, value);
162 #endif
163 #if LIBCURL_VERSION_NUM >= 0x070908
164 if (!strcmp("http.sslcapath", var))
165 return git_config_string(&ssl_capath, var, value);
166 #endif
167 if (!strcmp("http.sslcainfo", var))
168 return git_config_string(&ssl_cainfo, var, value);
169 if (!strcmp("http.sslcertpasswordprotected", var)) {
170 ssl_cert_password_required = git_config_bool(var, value);
171 return 0;
172 }
173 if (!strcmp("http.ssltry", var)) {
174 curl_ssl_try = git_config_bool(var, value);
175 return 0;
176 }
177 if (!strcmp("http.minsessions", var)) {
178 min_curl_sessions = git_config_int(var, value);
179 #ifndef USE_CURL_MULTI
180 if (min_curl_sessions > 1)
181 min_curl_sessions = 1;
182 #endif
183 return 0;
184 }
185 #ifdef USE_CURL_MULTI
186 if (!strcmp("http.maxrequests", var)) {
187 max_requests = git_config_int(var, value);
188 return 0;
189 }
190 #endif
191 if (!strcmp("http.lowspeedlimit", var)) {
192 curl_low_speed_limit = (long)git_config_int(var, value);
193 return 0;
194 }
195 if (!strcmp("http.lowspeedtime", var)) {
196 curl_low_speed_time = (long)git_config_int(var, value);
197 return 0;
198 }
199
200 if (!strcmp("http.noepsv", var)) {
201 curl_ftp_no_epsv = git_config_bool(var, value);
202 return 0;
203 }
204 if (!strcmp("http.proxy", var))
205 return git_config_string(&curl_http_proxy, var, value);
206
207 if (!strcmp("http.cookiefile", var))
208 return git_config_string(&curl_cookie_file, var, value);
209 if (!strcmp("http.savecookies", var)) {
210 curl_save_cookies = git_config_bool(var, value);
211 return 0;
212 }
213
214 if (!strcmp("http.postbuffer", var)) {
215 http_post_buffer = git_config_int(var, value);
216 if (http_post_buffer < LARGE_PACKET_MAX)
217 http_post_buffer = LARGE_PACKET_MAX;
218 return 0;
219 }
220
221 if (!strcmp("http.useragent", var))
222 return git_config_string(&user_agent, var, value);
223
224 /* Fall back on the default ones */
225 return git_default_config(var, value, cb);
226 }
227
228 static void init_curl_http_auth(CURL *result)
229 {
230 if (!http_auth.username)
231 return;
232
233 credential_fill(&http_auth);
234
235 #if LIBCURL_VERSION_NUM >= 0x071301
236 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
237 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
238 #else
239 {
240 static struct strbuf up = STRBUF_INIT;
241 /*
242 * Note that we assume we only ever have a single set of
243 * credentials in a given program run, so we do not have
244 * to worry about updating this buffer, only setting its
245 * initial value.
246 */
247 if (!up.len)
248 strbuf_addf(&up, "%s:%s",
249 http_auth.username, http_auth.password);
250 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
251 }
252 #endif
253 }
254
255 static int has_cert_password(void)
256 {
257 if (ssl_cert == NULL || ssl_cert_password_required != 1)
258 return 0;
259 if (!cert_auth.password) {
260 cert_auth.protocol = xstrdup("cert");
261 cert_auth.username = xstrdup("");
262 cert_auth.path = xstrdup(ssl_cert);
263 credential_fill(&cert_auth);
264 }
265 return 1;
266 }
267
268 #if LIBCURL_VERSION_NUM >= 0x071900
269 static void set_curl_keepalive(CURL *c)
270 {
271 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
272 }
273
274 #elif LIBCURL_VERSION_NUM >= 0x071000
275 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
276 {
277 int ka = 1;
278 int rc;
279 socklen_t len = (socklen_t)sizeof(ka);
280
281 if (type != CURLSOCKTYPE_IPCXN)
282 return 0;
283
284 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
285 if (rc < 0)
286 warning("unable to set SO_KEEPALIVE on socket %s",
287 strerror(errno));
288
289 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
290 }
291
292 static void set_curl_keepalive(CURL *c)
293 {
294 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
295 }
296
297 #else
298 static void set_curl_keepalive(CURL *c)
299 {
300 /* not supported on older curl versions */
301 }
302 #endif
303
304 static CURL *get_curl_handle(void)
305 {
306 CURL *result = curl_easy_init();
307 long allowed_protocols = 0;
308
309 if (!result)
310 die("curl_easy_init failed");
311
312 if (!curl_ssl_verify) {
313 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
314 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
315 } else {
316 /* Verify authenticity of the peer's certificate */
317 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
318 /* The name in the cert must match whom we tried to connect */
319 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
320 }
321
322 #if LIBCURL_VERSION_NUM >= 0x070907
323 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
324 #endif
325 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
326 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
327 #endif
328
329 if (http_proactive_auth)
330 init_curl_http_auth(result);
331
332 if (ssl_cert != NULL)
333 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
334 if (has_cert_password())
335 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
336 #if LIBCURL_VERSION_NUM >= 0x070903
337 if (ssl_key != NULL)
338 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
339 #endif
340 #if LIBCURL_VERSION_NUM >= 0x070908
341 if (ssl_capath != NULL)
342 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
343 #endif
344 if (ssl_cainfo != NULL)
345 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
346
347 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
348 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
349 curl_low_speed_limit);
350 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
351 curl_low_speed_time);
352 }
353
354 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
355 #if LIBCURL_VERSION_NUM >= 0x071301
356 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
357 #elif LIBCURL_VERSION_NUM >= 0x071101
358 curl_easy_setopt(result, CURLOPT_POST301, 1);
359 #endif
360 #if LIBCURL_VERSION_NUM >= 0x071304
361 if (is_transport_allowed("http"))
362 allowed_protocols |= CURLPROTO_HTTP;
363 if (is_transport_allowed("https"))
364 allowed_protocols |= CURLPROTO_HTTPS;
365 if (is_transport_allowed("ftp"))
366 allowed_protocols |= CURLPROTO_FTP;
367 if (is_transport_allowed("ftps"))
368 allowed_protocols |= CURLPROTO_FTPS;
369 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
370 #else
371 if (transport_restrict_protocols())
372 warning("protocol restrictions not applied to curl redirects because\n"
373 "your curl version is too old (>= 7.19.4)");
374 #endif
375
376 if (getenv("GIT_CURL_VERBOSE"))
377 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
378
379 curl_easy_setopt(result, CURLOPT_USERAGENT,
380 user_agent ? user_agent : git_user_agent());
381
382 if (curl_ftp_no_epsv)
383 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
384
385 #ifdef CURLOPT_USE_SSL
386 if (curl_ssl_try)
387 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
388 #endif
389
390 if (curl_http_proxy) {
391 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
392 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
393 }
394
395 set_curl_keepalive(result);
396
397 return result;
398 }
399
400 static void set_from_env(const char **var, const char *envname)
401 {
402 const char *val = getenv(envname);
403 if (val)
404 *var = val;
405 }
406
407 void http_init(struct remote *remote, const char *url, int proactive_auth)
408 {
409 char *low_speed_limit;
410 char *low_speed_time;
411 char *normalized_url;
412 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
413
414 config.section = "http";
415 config.key = NULL;
416 config.collect_fn = http_options;
417 config.cascade_fn = git_default_config;
418 config.cb = NULL;
419
420 http_is_verbose = 0;
421 normalized_url = url_normalize(url, &config.url);
422
423 git_config(urlmatch_config_entry, &config);
424 free(normalized_url);
425
426 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
427 die("curl_global_init failed");
428
429 http_proactive_auth = proactive_auth;
430
431 if (remote && remote->http_proxy)
432 curl_http_proxy = xstrdup(remote->http_proxy);
433
434 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
435 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
436
437 #ifdef USE_CURL_MULTI
438 {
439 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
440 if (http_max_requests != NULL)
441 max_requests = atoi(http_max_requests);
442 }
443
444 curlm = curl_multi_init();
445 if (!curlm)
446 die("curl_multi_init failed");
447 #endif
448
449 if (getenv("GIT_SSL_NO_VERIFY"))
450 curl_ssl_verify = 0;
451
452 set_from_env(&ssl_cert, "GIT_SSL_CERT");
453 #if LIBCURL_VERSION_NUM >= 0x070903
454 set_from_env(&ssl_key, "GIT_SSL_KEY");
455 #endif
456 #if LIBCURL_VERSION_NUM >= 0x070908
457 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
458 #endif
459 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
460
461 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
462
463 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
464 if (low_speed_limit != NULL)
465 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
466 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
467 if (low_speed_time != NULL)
468 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
469
470 if (curl_ssl_verify == -1)
471 curl_ssl_verify = 1;
472
473 curl_session_count = 0;
474 #ifdef USE_CURL_MULTI
475 if (max_requests < 1)
476 max_requests = DEFAULT_MAX_REQUESTS;
477 #endif
478
479 if (getenv("GIT_CURL_FTP_NO_EPSV"))
480 curl_ftp_no_epsv = 1;
481
482 if (url) {
483 credential_from_url(&http_auth, url);
484 if (!ssl_cert_password_required &&
485 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
486 starts_with(url, "https://"))
487 ssl_cert_password_required = 1;
488 }
489
490 #ifndef NO_CURL_EASY_DUPHANDLE
491 curl_default = get_curl_handle();
492 #endif
493 }
494
495 void http_cleanup(void)
496 {
497 struct active_request_slot *slot = active_queue_head;
498
499 while (slot != NULL) {
500 struct active_request_slot *next = slot->next;
501 if (slot->curl != NULL) {
502 #ifdef USE_CURL_MULTI
503 curl_multi_remove_handle(curlm, slot->curl);
504 #endif
505 curl_easy_cleanup(slot->curl);
506 }
507 free(slot);
508 slot = next;
509 }
510 active_queue_head = NULL;
511
512 #ifndef NO_CURL_EASY_DUPHANDLE
513 curl_easy_cleanup(curl_default);
514 #endif
515
516 #ifdef USE_CURL_MULTI
517 curl_multi_cleanup(curlm);
518 #endif
519 curl_global_cleanup();
520
521 curl_slist_free_all(pragma_header);
522 pragma_header = NULL;
523
524 curl_slist_free_all(no_pragma_header);
525 no_pragma_header = NULL;
526
527 if (curl_http_proxy) {
528 free((void *)curl_http_proxy);
529 curl_http_proxy = NULL;
530 }
531
532 if (cert_auth.password != NULL) {
533 memset(cert_auth.password, 0, strlen(cert_auth.password));
534 free(cert_auth.password);
535 cert_auth.password = NULL;
536 }
537 ssl_cert_password_required = 0;
538 }
539
540 struct active_request_slot *get_active_slot(void)
541 {
542 struct active_request_slot *slot = active_queue_head;
543 struct active_request_slot *newslot;
544
545 #ifdef USE_CURL_MULTI
546 int num_transfers;
547
548 /* Wait for a slot to open up if the queue is full */
549 while (active_requests >= max_requests) {
550 curl_multi_perform(curlm, &num_transfers);
551 if (num_transfers < active_requests)
552 process_curl_messages();
553 }
554 #endif
555
556 while (slot != NULL && slot->in_use)
557 slot = slot->next;
558
559 if (slot == NULL) {
560 newslot = xmalloc(sizeof(*newslot));
561 newslot->curl = NULL;
562 newslot->in_use = 0;
563 newslot->next = NULL;
564
565 slot = active_queue_head;
566 if (slot == NULL) {
567 active_queue_head = newslot;
568 } else {
569 while (slot->next != NULL)
570 slot = slot->next;
571 slot->next = newslot;
572 }
573 slot = newslot;
574 }
575
576 if (slot->curl == NULL) {
577 #ifdef NO_CURL_EASY_DUPHANDLE
578 slot->curl = get_curl_handle();
579 #else
580 slot->curl = curl_easy_duphandle(curl_default);
581 #endif
582 curl_session_count++;
583 }
584
585 active_requests++;
586 slot->in_use = 1;
587 slot->results = NULL;
588 slot->finished = NULL;
589 slot->callback_data = NULL;
590 slot->callback_func = NULL;
591 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
592 if (curl_save_cookies)
593 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
594 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
595 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
596 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
597 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
598 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
599 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
600 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
601 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
602 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
603 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
604 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
605 #endif
606 if (http_auth.password)
607 init_curl_http_auth(slot->curl);
608
609 return slot;
610 }
611
612 int start_active_slot(struct active_request_slot *slot)
613 {
614 #ifdef USE_CURL_MULTI
615 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
616 int num_transfers;
617
618 if (curlm_result != CURLM_OK &&
619 curlm_result != CURLM_CALL_MULTI_PERFORM) {
620 active_requests--;
621 slot->in_use = 0;
622 return 0;
623 }
624
625 /*
626 * We know there must be something to do, since we just added
627 * something.
628 */
629 curl_multi_perform(curlm, &num_transfers);
630 #endif
631 return 1;
632 }
633
634 #ifdef USE_CURL_MULTI
635 struct fill_chain {
636 void *data;
637 int (*fill)(void *);
638 struct fill_chain *next;
639 };
640
641 static struct fill_chain *fill_cfg;
642
643 void add_fill_function(void *data, int (*fill)(void *))
644 {
645 struct fill_chain *new = xmalloc(sizeof(*new));
646 struct fill_chain **linkp = &fill_cfg;
647 new->data = data;
648 new->fill = fill;
649 new->next = NULL;
650 while (*linkp)
651 linkp = &(*linkp)->next;
652 *linkp = new;
653 }
654
655 void fill_active_slots(void)
656 {
657 struct active_request_slot *slot = active_queue_head;
658
659 while (active_requests < max_requests) {
660 struct fill_chain *fill;
661 for (fill = fill_cfg; fill; fill = fill->next)
662 if (fill->fill(fill->data))
663 break;
664
665 if (!fill)
666 break;
667 }
668
669 while (slot != NULL) {
670 if (!slot->in_use && slot->curl != NULL
671 && curl_session_count > min_curl_sessions) {
672 curl_easy_cleanup(slot->curl);
673 slot->curl = NULL;
674 curl_session_count--;
675 }
676 slot = slot->next;
677 }
678 }
679
680 void step_active_slots(void)
681 {
682 int num_transfers;
683 CURLMcode curlm_result;
684
685 do {
686 curlm_result = curl_multi_perform(curlm, &num_transfers);
687 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
688 if (num_transfers < active_requests) {
689 process_curl_messages();
690 fill_active_slots();
691 }
692 }
693 #endif
694
695 void run_active_slot(struct active_request_slot *slot)
696 {
697 #ifdef USE_CURL_MULTI
698 fd_set readfds;
699 fd_set writefds;
700 fd_set excfds;
701 int max_fd;
702 struct timeval select_timeout;
703 int finished = 0;
704
705 slot->finished = &finished;
706 while (!finished) {
707 step_active_slots();
708
709 if (slot->in_use) {
710 #if LIBCURL_VERSION_NUM >= 0x070f04
711 long curl_timeout;
712 curl_multi_timeout(curlm, &curl_timeout);
713 if (curl_timeout == 0) {
714 continue;
715 } else if (curl_timeout == -1) {
716 select_timeout.tv_sec = 0;
717 select_timeout.tv_usec = 50000;
718 } else {
719 select_timeout.tv_sec = curl_timeout / 1000;
720 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
721 }
722 #else
723 select_timeout.tv_sec = 0;
724 select_timeout.tv_usec = 50000;
725 #endif
726
727 max_fd = -1;
728 FD_ZERO(&readfds);
729 FD_ZERO(&writefds);
730 FD_ZERO(&excfds);
731 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
732
733 /*
734 * It can happen that curl_multi_timeout returns a pathologically
735 * long timeout when curl_multi_fdset returns no file descriptors
736 * to read. See commit message for more details.
737 */
738 if (max_fd < 0 &&
739 (select_timeout.tv_sec > 0 ||
740 select_timeout.tv_usec > 50000)) {
741 select_timeout.tv_sec = 0;
742 select_timeout.tv_usec = 50000;
743 }
744
745 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
746 }
747 }
748 #else
749 while (slot->in_use) {
750 slot->curl_result = curl_easy_perform(slot->curl);
751 finish_active_slot(slot);
752 }
753 #endif
754 }
755
756 static void closedown_active_slot(struct active_request_slot *slot)
757 {
758 active_requests--;
759 slot->in_use = 0;
760 }
761
762 static void release_active_slot(struct active_request_slot *slot)
763 {
764 closedown_active_slot(slot);
765 if (slot->curl && curl_session_count > min_curl_sessions) {
766 #ifdef USE_CURL_MULTI
767 curl_multi_remove_handle(curlm, slot->curl);
768 #endif
769 curl_easy_cleanup(slot->curl);
770 slot->curl = NULL;
771 curl_session_count--;
772 }
773 #ifdef USE_CURL_MULTI
774 fill_active_slots();
775 #endif
776 }
777
778 void finish_active_slot(struct active_request_slot *slot)
779 {
780 closedown_active_slot(slot);
781 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
782
783 if (slot->finished != NULL)
784 (*slot->finished) = 1;
785
786 /* Store slot results so they can be read after the slot is reused */
787 if (slot->results != NULL) {
788 slot->results->curl_result = slot->curl_result;
789 slot->results->http_code = slot->http_code;
790 #if LIBCURL_VERSION_NUM >= 0x070a08
791 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
792 &slot->results->auth_avail);
793 #else
794 slot->results->auth_avail = 0;
795 #endif
796 }
797
798 /* Run callback if appropriate */
799 if (slot->callback_func != NULL)
800 slot->callback_func(slot->callback_data);
801 }
802
803 void finish_all_active_slots(void)
804 {
805 struct active_request_slot *slot = active_queue_head;
806
807 while (slot != NULL)
808 if (slot->in_use) {
809 run_active_slot(slot);
810 slot = active_queue_head;
811 } else {
812 slot = slot->next;
813 }
814 }
815
816 /* Helpers for modifying and creating URLs */
817 static inline int needs_quote(int ch)
818 {
819 if (((ch >= 'A') && (ch <= 'Z'))
820 || ((ch >= 'a') && (ch <= 'z'))
821 || ((ch >= '0') && (ch <= '9'))
822 || (ch == '/')
823 || (ch == '-')
824 || (ch == '.'))
825 return 0;
826 return 1;
827 }
828
829 static char *quote_ref_url(const char *base, const char *ref)
830 {
831 struct strbuf buf = STRBUF_INIT;
832 const char *cp;
833 int ch;
834
835 end_url_with_slash(&buf, base);
836
837 for (cp = ref; (ch = *cp) != 0; cp++)
838 if (needs_quote(ch))
839 strbuf_addf(&buf, "%%%02x", ch);
840 else
841 strbuf_addch(&buf, *cp);
842
843 return strbuf_detach(&buf, NULL);
844 }
845
846 void append_remote_object_url(struct strbuf *buf, const char *url,
847 const char *hex,
848 int only_two_digit_prefix)
849 {
850 end_url_with_slash(buf, url);
851
852 strbuf_addf(buf, "objects/%.*s/", 2, hex);
853 if (!only_two_digit_prefix)
854 strbuf_addf(buf, "%s", hex+2);
855 }
856
857 char *get_remote_object_url(const char *url, const char *hex,
858 int only_two_digit_prefix)
859 {
860 struct strbuf buf = STRBUF_INIT;
861 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
862 return strbuf_detach(&buf, NULL);
863 }
864
865 int handle_curl_result(struct slot_results *results)
866 {
867 /*
868 * If we see a failing http code with CURLE_OK, we have turned off
869 * FAILONERROR (to keep the server's custom error response), and should
870 * translate the code into failure here.
871 */
872 if (results->curl_result == CURLE_OK &&
873 results->http_code >= 400) {
874 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
875 /*
876 * Normally curl will already have put the "reason phrase"
877 * from the server into curl_errorstr; unfortunately without
878 * FAILONERROR it is lost, so we can give only the numeric
879 * status code.
880 */
881 snprintf(curl_errorstr, sizeof(curl_errorstr),
882 "The requested URL returned error: %ld",
883 results->http_code);
884 }
885
886 if (results->curl_result == CURLE_OK) {
887 credential_approve(&http_auth);
888 return HTTP_OK;
889 } else if (missing_target(results))
890 return HTTP_MISSING_TARGET;
891 else if (results->http_code == 401) {
892 if (http_auth.username && http_auth.password) {
893 credential_reject(&http_auth);
894 return HTTP_NOAUTH;
895 } else {
896 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
897 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
898 #endif
899 return HTTP_REAUTH;
900 }
901 } else {
902 #if LIBCURL_VERSION_NUM >= 0x070c00
903 if (!curl_errorstr[0])
904 strlcpy(curl_errorstr,
905 curl_easy_strerror(results->curl_result),
906 sizeof(curl_errorstr));
907 #endif
908 return HTTP_ERROR;
909 }
910 }
911
912 int run_one_slot(struct active_request_slot *slot,
913 struct slot_results *results)
914 {
915 slot->results = results;
916 if (!start_active_slot(slot)) {
917 snprintf(curl_errorstr, sizeof(curl_errorstr),
918 "failed to start HTTP request");
919 return HTTP_START_FAILED;
920 }
921
922 run_active_slot(slot);
923 return handle_curl_result(results);
924 }
925
926 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
927 {
928 char *ptr;
929 CURLcode ret;
930
931 strbuf_reset(buf);
932 ret = curl_easy_getinfo(curl, info, &ptr);
933 if (!ret && ptr)
934 strbuf_addstr(buf, ptr);
935 return ret;
936 }
937
938 /*
939 * Check for and extract a content-type parameter. "raw"
940 * should be positioned at the start of the potential
941 * parameter, with any whitespace already removed.
942 *
943 * "name" is the name of the parameter. The value is appended
944 * to "out".
945 */
946 static int extract_param(const char *raw, const char *name,
947 struct strbuf *out)
948 {
949 size_t len = strlen(name);
950
951 if (strncasecmp(raw, name, len))
952 return -1;
953 raw += len;
954
955 if (*raw != '=')
956 return -1;
957 raw++;
958
959 while (*raw && !isspace(*raw) && *raw != ';')
960 strbuf_addch(out, *raw++);
961 return 0;
962 }
963
964 /*
965 * Extract a normalized version of the content type, with any
966 * spaces suppressed, all letters lowercased, and no trailing ";"
967 * or parameters.
968 *
969 * Note that we will silently remove even invalid whitespace. For
970 * example, "text / plain" is specifically forbidden by RFC 2616,
971 * but "text/plain" is the only reasonable output, and this keeps
972 * our code simple.
973 *
974 * If the "charset" argument is not NULL, store the value of any
975 * charset parameter there.
976 *
977 * Example:
978 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
979 * "text / plain" -> "text/plain"
980 */
981 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
982 struct strbuf *charset)
983 {
984 const char *p;
985
986 strbuf_reset(type);
987 strbuf_grow(type, raw->len);
988 for (p = raw->buf; *p; p++) {
989 if (isspace(*p))
990 continue;
991 if (*p == ';') {
992 p++;
993 break;
994 }
995 strbuf_addch(type, tolower(*p));
996 }
997
998 if (!charset)
999 return;
1000
1001 strbuf_reset(charset);
1002 while (*p) {
1003 while (isspace(*p) || *p == ';')
1004 p++;
1005 if (!extract_param(p, "charset", charset))
1006 return;
1007 while (*p && !isspace(*p))
1008 p++;
1009 }
1010
1011 if (!charset->len && starts_with(type->buf, "text/"))
1012 strbuf_addstr(charset, "ISO-8859-1");
1013 }
1014
1015
1016 /* http_request() targets */
1017 #define HTTP_REQUEST_STRBUF 0
1018 #define HTTP_REQUEST_FILE 1
1019
1020 static int http_request(const char *url,
1021 void *result, int target,
1022 const struct http_get_options *options)
1023 {
1024 struct active_request_slot *slot;
1025 struct slot_results results;
1026 struct curl_slist *headers = NULL;
1027 struct strbuf buf = STRBUF_INIT;
1028 int ret;
1029
1030 slot = get_active_slot();
1031 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1032
1033 if (result == NULL) {
1034 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1035 } else {
1036 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1037 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1038
1039 if (target == HTTP_REQUEST_FILE) {
1040 long posn = ftell(result);
1041 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1042 fwrite);
1043 if (posn > 0) {
1044 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1045 headers = curl_slist_append(headers, buf.buf);
1046 strbuf_reset(&buf);
1047 }
1048 } else
1049 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1050 fwrite_buffer);
1051 }
1052
1053 strbuf_addstr(&buf, "Pragma:");
1054 if (options && options->no_cache)
1055 strbuf_addstr(&buf, " no-cache");
1056 if (options && options->keep_error)
1057 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1058
1059 headers = curl_slist_append(headers, buf.buf);
1060
1061 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1062 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1063 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1064
1065 ret = run_one_slot(slot, &results);
1066
1067 if (options && options->content_type) {
1068 struct strbuf raw = STRBUF_INIT;
1069 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1070 extract_content_type(&raw, options->content_type,
1071 options->charset);
1072 strbuf_release(&raw);
1073 }
1074
1075 if (options && options->effective_url)
1076 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1077 options->effective_url);
1078
1079 curl_slist_free_all(headers);
1080 strbuf_release(&buf);
1081
1082 return ret;
1083 }
1084
1085 /*
1086 * Update the "base" url to a more appropriate value, as deduced by
1087 * redirects seen when requesting a URL starting with "url".
1088 *
1089 * The "asked" parameter is a URL that we asked curl to access, and must begin
1090 * with "base".
1091 *
1092 * The "got" parameter is the URL that curl reported to us as where we ended
1093 * up.
1094 *
1095 * Returns 1 if we updated the base url, 0 otherwise.
1096 *
1097 * Our basic strategy is to compare "base" and "asked" to find the bits
1098 * specific to our request. We then strip those bits off of "got" to yield the
1099 * new base. So for example, if our base is "http://example.com/foo.git",
1100 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1101 * with "https://other.example.com/foo.git/info/refs". We would want the
1102 * new URL to become "https://other.example.com/foo.git".
1103 *
1104 * Note that this assumes a sane redirect scheme. It's entirely possible
1105 * in the example above to end up at a URL that does not even end in
1106 * "info/refs". In such a case we simply punt, as there is not much we can
1107 * do (and such a scheme is unlikely to represent a real git repository,
1108 * which means we are likely about to abort anyway).
1109 */
1110 static int update_url_from_redirect(struct strbuf *base,
1111 const char *asked,
1112 const struct strbuf *got)
1113 {
1114 const char *tail;
1115 size_t tail_len;
1116
1117 if (!strcmp(asked, got->buf))
1118 return 0;
1119
1120 if (!skip_prefix(asked, base->buf, &tail))
1121 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1122 asked, base->buf);
1123
1124 tail_len = strlen(tail);
1125
1126 if (got->len < tail_len ||
1127 strcmp(tail, got->buf + got->len - tail_len))
1128 return 0; /* insane redirect scheme */
1129
1130 strbuf_reset(base);
1131 strbuf_add(base, got->buf, got->len - tail_len);
1132 return 1;
1133 }
1134
1135 static int http_request_reauth(const char *url,
1136 void *result, int target,
1137 struct http_get_options *options)
1138 {
1139 int ret = http_request(url, result, target, options);
1140
1141 if (options && options->effective_url && options->base_url) {
1142 if (update_url_from_redirect(options->base_url,
1143 url, options->effective_url)) {
1144 credential_from_url(&http_auth, options->base_url->buf);
1145 url = options->effective_url->buf;
1146 }
1147 }
1148
1149 if (ret != HTTP_REAUTH)
1150 return ret;
1151
1152 /*
1153 * If we are using KEEP_ERROR, the previous request may have
1154 * put cruft into our output stream; we should clear it out before
1155 * making our next request. We only know how to do this for
1156 * the strbuf case, but that is enough to satisfy current callers.
1157 */
1158 if (options && options->keep_error) {
1159 switch (target) {
1160 case HTTP_REQUEST_STRBUF:
1161 strbuf_reset(result);
1162 break;
1163 default:
1164 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1165 }
1166 }
1167
1168 credential_fill(&http_auth);
1169
1170 return http_request(url, result, target, options);
1171 }
1172
1173 int http_get_strbuf(const char *url,
1174 struct strbuf *result,
1175 struct http_get_options *options)
1176 {
1177 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1178 }
1179
1180 /*
1181 * Downloads a URL and stores the result in the given file.
1182 *
1183 * If a previous interrupted download is detected (i.e. a previous temporary
1184 * file is still around) the download is resumed.
1185 */
1186 static int http_get_file(const char *url, const char *filename,
1187 struct http_get_options *options)
1188 {
1189 int ret;
1190 struct strbuf tmpfile = STRBUF_INIT;
1191 FILE *result;
1192
1193 strbuf_addf(&tmpfile, "%s.temp", filename);
1194 result = fopen(tmpfile.buf, "a");
1195 if (!result) {
1196 error("Unable to open local file %s", tmpfile.buf);
1197 ret = HTTP_ERROR;
1198 goto cleanup;
1199 }
1200
1201 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1202 fclose(result);
1203
1204 if (ret == HTTP_OK && move_temp_to_file(tmpfile.buf, filename))
1205 ret = HTTP_ERROR;
1206 cleanup:
1207 strbuf_release(&tmpfile);
1208 return ret;
1209 }
1210
1211 int http_fetch_ref(const char *base, struct ref *ref)
1212 {
1213 struct http_get_options options = {0};
1214 char *url;
1215 struct strbuf buffer = STRBUF_INIT;
1216 int ret = -1;
1217
1218 options.no_cache = 1;
1219
1220 url = quote_ref_url(base, ref->name);
1221 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1222 strbuf_rtrim(&buffer);
1223 if (buffer.len == 40)
1224 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1225 else if (starts_with(buffer.buf, "ref: ")) {
1226 ref->symref = xstrdup(buffer.buf + 5);
1227 ret = 0;
1228 }
1229 }
1230
1231 strbuf_release(&buffer);
1232 free(url);
1233 return ret;
1234 }
1235
1236 /* Helpers for fetching packs */
1237 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1238 {
1239 char *url, *tmp;
1240 struct strbuf buf = STRBUF_INIT;
1241
1242 if (http_is_verbose)
1243 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1244
1245 end_url_with_slash(&buf, base_url);
1246 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1247 url = strbuf_detach(&buf, NULL);
1248
1249 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1250 tmp = strbuf_detach(&buf, NULL);
1251
1252 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1253 error("Unable to get pack index %s", url);
1254 free(tmp);
1255 tmp = NULL;
1256 }
1257
1258 free(url);
1259 return tmp;
1260 }
1261
1262 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1263 unsigned char *sha1, const char *base_url)
1264 {
1265 struct packed_git *new_pack;
1266 char *tmp_idx = NULL;
1267 int ret;
1268
1269 if (has_pack_index(sha1)) {
1270 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1271 if (!new_pack)
1272 return -1; /* parse_pack_index() already issued error message */
1273 goto add_pack;
1274 }
1275
1276 tmp_idx = fetch_pack_index(sha1, base_url);
1277 if (!tmp_idx)
1278 return -1;
1279
1280 new_pack = parse_pack_index(sha1, tmp_idx);
1281 if (!new_pack) {
1282 unlink(tmp_idx);
1283 free(tmp_idx);
1284
1285 return -1; /* parse_pack_index() already issued error message */
1286 }
1287
1288 ret = verify_pack_index(new_pack);
1289 if (!ret) {
1290 close_pack_index(new_pack);
1291 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1292 }
1293 free(tmp_idx);
1294 if (ret)
1295 return -1;
1296
1297 add_pack:
1298 new_pack->next = *packs_head;
1299 *packs_head = new_pack;
1300 return 0;
1301 }
1302
1303 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1304 {
1305 struct http_get_options options = {0};
1306 int ret = 0, i = 0;
1307 char *url, *data;
1308 struct strbuf buf = STRBUF_INIT;
1309 unsigned char sha1[20];
1310
1311 end_url_with_slash(&buf, base_url);
1312 strbuf_addstr(&buf, "objects/info/packs");
1313 url = strbuf_detach(&buf, NULL);
1314
1315 options.no_cache = 1;
1316 ret = http_get_strbuf(url, &buf, &options);
1317 if (ret != HTTP_OK)
1318 goto cleanup;
1319
1320 data = buf.buf;
1321 while (i < buf.len) {
1322 switch (data[i]) {
1323 case 'P':
1324 i++;
1325 if (i + 52 <= buf.len &&
1326 starts_with(data + i, " pack-") &&
1327 starts_with(data + i + 46, ".pack\n")) {
1328 get_sha1_hex(data + i + 6, sha1);
1329 fetch_and_setup_pack_index(packs_head, sha1,
1330 base_url);
1331 i += 51;
1332 break;
1333 }
1334 default:
1335 while (i < buf.len && data[i] != '\n')
1336 i++;
1337 }
1338 i++;
1339 }
1340
1341 cleanup:
1342 free(url);
1343 return ret;
1344 }
1345
1346 void release_http_pack_request(struct http_pack_request *preq)
1347 {
1348 if (preq->packfile != NULL) {
1349 fclose(preq->packfile);
1350 preq->packfile = NULL;
1351 }
1352 if (preq->range_header != NULL) {
1353 curl_slist_free_all(preq->range_header);
1354 preq->range_header = NULL;
1355 }
1356 preq->slot = NULL;
1357 free(preq->url);
1358 }
1359
1360 int finish_http_pack_request(struct http_pack_request *preq)
1361 {
1362 struct packed_git **lst;
1363 struct packed_git *p = preq->target;
1364 char *tmp_idx;
1365 struct child_process ip = CHILD_PROCESS_INIT;
1366 const char *ip_argv[8];
1367
1368 close_pack_index(p);
1369
1370 fclose(preq->packfile);
1371 preq->packfile = NULL;
1372
1373 lst = preq->lst;
1374 while (*lst != p)
1375 lst = &((*lst)->next);
1376 *lst = (*lst)->next;
1377
1378 tmp_idx = xstrdup(preq->tmpfile);
1379 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1380 ".idx.temp");
1381
1382 ip_argv[0] = "index-pack";
1383 ip_argv[1] = "-o";
1384 ip_argv[2] = tmp_idx;
1385 ip_argv[3] = preq->tmpfile;
1386 ip_argv[4] = NULL;
1387
1388 ip.argv = ip_argv;
1389 ip.git_cmd = 1;
1390 ip.no_stdin = 1;
1391 ip.no_stdout = 1;
1392
1393 if (run_command(&ip)) {
1394 unlink(preq->tmpfile);
1395 unlink(tmp_idx);
1396 free(tmp_idx);
1397 return -1;
1398 }
1399
1400 unlink(sha1_pack_index_name(p->sha1));
1401
1402 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1403 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1404 free(tmp_idx);
1405 return -1;
1406 }
1407
1408 install_packed_git(p);
1409 free(tmp_idx);
1410 return 0;
1411 }
1412
1413 struct http_pack_request *new_http_pack_request(
1414 struct packed_git *target, const char *base_url)
1415 {
1416 long prev_posn = 0;
1417 char range[RANGE_HEADER_SIZE];
1418 struct strbuf buf = STRBUF_INIT;
1419 struct http_pack_request *preq;
1420
1421 preq = xcalloc(1, sizeof(*preq));
1422 preq->target = target;
1423
1424 end_url_with_slash(&buf, base_url);
1425 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1426 sha1_to_hex(target->sha1));
1427 preq->url = strbuf_detach(&buf, NULL);
1428
1429 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1430 sha1_pack_name(target->sha1));
1431 preq->packfile = fopen(preq->tmpfile, "a");
1432 if (!preq->packfile) {
1433 error("Unable to open local file %s for pack",
1434 preq->tmpfile);
1435 goto abort;
1436 }
1437
1438 preq->slot = get_active_slot();
1439 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1440 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1441 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1442 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1443 no_pragma_header);
1444
1445 /*
1446 * If there is data present from a previous transfer attempt,
1447 * resume where it left off
1448 */
1449 prev_posn = ftell(preq->packfile);
1450 if (prev_posn>0) {
1451 if (http_is_verbose)
1452 fprintf(stderr,
1453 "Resuming fetch of pack %s at byte %ld\n",
1454 sha1_to_hex(target->sha1), prev_posn);
1455 sprintf(range, "Range: bytes=%ld-", prev_posn);
1456 preq->range_header = curl_slist_append(NULL, range);
1457 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1458 preq->range_header);
1459 }
1460
1461 return preq;
1462
1463 abort:
1464 free(preq->url);
1465 free(preq);
1466 return NULL;
1467 }
1468
1469 /* Helpers for fetching objects (loose) */
1470 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1471 void *data)
1472 {
1473 unsigned char expn[4096];
1474 size_t size = eltsize * nmemb;
1475 int posn = 0;
1476 struct http_object_request *freq =
1477 (struct http_object_request *)data;
1478 do {
1479 ssize_t retval = xwrite(freq->localfile,
1480 (char *) ptr + posn, size - posn);
1481 if (retval < 0)
1482 return posn;
1483 posn += retval;
1484 } while (posn < size);
1485
1486 freq->stream.avail_in = size;
1487 freq->stream.next_in = (void *)ptr;
1488 do {
1489 freq->stream.next_out = expn;
1490 freq->stream.avail_out = sizeof(expn);
1491 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1492 git_SHA1_Update(&freq->c, expn,
1493 sizeof(expn) - freq->stream.avail_out);
1494 } while (freq->stream.avail_in && freq->zret == Z_OK);
1495 return size;
1496 }
1497
1498 struct http_object_request *new_http_object_request(const char *base_url,
1499 unsigned char *sha1)
1500 {
1501 char *hex = sha1_to_hex(sha1);
1502 const char *filename;
1503 char prevfile[PATH_MAX];
1504 int prevlocal;
1505 char prev_buf[PREV_BUF_SIZE];
1506 ssize_t prev_read = 0;
1507 long prev_posn = 0;
1508 char range[RANGE_HEADER_SIZE];
1509 struct curl_slist *range_header = NULL;
1510 struct http_object_request *freq;
1511
1512 freq = xcalloc(1, sizeof(*freq));
1513 hashcpy(freq->sha1, sha1);
1514 freq->localfile = -1;
1515
1516 filename = sha1_file_name(sha1);
1517 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1518 "%s.temp", filename);
1519
1520 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1521 unlink_or_warn(prevfile);
1522 rename(freq->tmpfile, prevfile);
1523 unlink_or_warn(freq->tmpfile);
1524
1525 if (freq->localfile != -1)
1526 error("fd leakage in start: %d", freq->localfile);
1527 freq->localfile = open(freq->tmpfile,
1528 O_WRONLY | O_CREAT | O_EXCL, 0666);
1529 /*
1530 * This could have failed due to the "lazy directory creation";
1531 * try to mkdir the last path component.
1532 */
1533 if (freq->localfile < 0 && errno == ENOENT) {
1534 char *dir = strrchr(freq->tmpfile, '/');
1535 if (dir) {
1536 *dir = 0;
1537 mkdir(freq->tmpfile, 0777);
1538 *dir = '/';
1539 }
1540 freq->localfile = open(freq->tmpfile,
1541 O_WRONLY | O_CREAT | O_EXCL, 0666);
1542 }
1543
1544 if (freq->localfile < 0) {
1545 error("Couldn't create temporary file %s: %s",
1546 freq->tmpfile, strerror(errno));
1547 goto abort;
1548 }
1549
1550 git_inflate_init(&freq->stream);
1551
1552 git_SHA1_Init(&freq->c);
1553
1554 freq->url = get_remote_object_url(base_url, hex, 0);
1555
1556 /*
1557 * If a previous temp file is present, process what was already
1558 * fetched.
1559 */
1560 prevlocal = open(prevfile, O_RDONLY);
1561 if (prevlocal != -1) {
1562 do {
1563 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1564 if (prev_read>0) {
1565 if (fwrite_sha1_file(prev_buf,
1566 1,
1567 prev_read,
1568 freq) == prev_read) {
1569 prev_posn += prev_read;
1570 } else {
1571 prev_read = -1;
1572 }
1573 }
1574 } while (prev_read > 0);
1575 close(prevlocal);
1576 }
1577 unlink_or_warn(prevfile);
1578
1579 /*
1580 * Reset inflate/SHA1 if there was an error reading the previous temp
1581 * file; also rewind to the beginning of the local file.
1582 */
1583 if (prev_read == -1) {
1584 memset(&freq->stream, 0, sizeof(freq->stream));
1585 git_inflate_init(&freq->stream);
1586 git_SHA1_Init(&freq->c);
1587 if (prev_posn>0) {
1588 prev_posn = 0;
1589 lseek(freq->localfile, 0, SEEK_SET);
1590 if (ftruncate(freq->localfile, 0) < 0) {
1591 error("Couldn't truncate temporary file %s: %s",
1592 freq->tmpfile, strerror(errno));
1593 goto abort;
1594 }
1595 }
1596 }
1597
1598 freq->slot = get_active_slot();
1599
1600 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1601 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1602 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1603 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1604 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1605
1606 /*
1607 * If we have successfully processed data from a previous fetch
1608 * attempt, only fetch the data we don't already have.
1609 */
1610 if (prev_posn>0) {
1611 if (http_is_verbose)
1612 fprintf(stderr,
1613 "Resuming fetch of object %s at byte %ld\n",
1614 hex, prev_posn);
1615 sprintf(range, "Range: bytes=%ld-", prev_posn);
1616 range_header = curl_slist_append(range_header, range);
1617 curl_easy_setopt(freq->slot->curl,
1618 CURLOPT_HTTPHEADER, range_header);
1619 }
1620
1621 return freq;
1622
1623 abort:
1624 free(freq->url);
1625 free(freq);
1626 return NULL;
1627 }
1628
1629 void process_http_object_request(struct http_object_request *freq)
1630 {
1631 if (freq->slot == NULL)
1632 return;
1633 freq->curl_result = freq->slot->curl_result;
1634 freq->http_code = freq->slot->http_code;
1635 freq->slot = NULL;
1636 }
1637
1638 int finish_http_object_request(struct http_object_request *freq)
1639 {
1640 struct stat st;
1641
1642 close(freq->localfile);
1643 freq->localfile = -1;
1644
1645 process_http_object_request(freq);
1646
1647 if (freq->http_code == 416) {
1648 warning("requested range invalid; we may already have all the data.");
1649 } else if (freq->curl_result != CURLE_OK) {
1650 if (stat(freq->tmpfile, &st) == 0)
1651 if (st.st_size == 0)
1652 unlink_or_warn(freq->tmpfile);
1653 return -1;
1654 }
1655
1656 git_inflate_end(&freq->stream);
1657 git_SHA1_Final(freq->real_sha1, &freq->c);
1658 if (freq->zret != Z_STREAM_END) {
1659 unlink_or_warn(freq->tmpfile);
1660 return -1;
1661 }
1662 if (hashcmp(freq->sha1, freq->real_sha1)) {
1663 unlink_or_warn(freq->tmpfile);
1664 return -1;
1665 }
1666 freq->rename =
1667 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1668
1669 return freq->rename;
1670 }
1671
1672 void abort_http_object_request(struct http_object_request *freq)
1673 {
1674 unlink_or_warn(freq->tmpfile);
1675
1676 release_http_object_request(freq);
1677 }
1678
1679 void release_http_object_request(struct http_object_request *freq)
1680 {
1681 if (freq->localfile != -1) {
1682 close(freq->localfile);
1683 freq->localfile = -1;
1684 }
1685 if (freq->url != NULL) {
1686 free(freq->url);
1687 freq->url = NULL;
1688 }
1689 if (freq->slot != NULL) {
1690 freq->slot->callback_func = NULL;
1691 freq->slot->callback_data = NULL;
1692 release_active_slot(freq->slot);
1693 freq->slot = NULL;
1694 }
1695 }
git for Debian