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http: limit redirection depth
[alt-git.git] / http.c
blob00e3fc80e8161080549db26afd68e341989af453
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 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
356 #if LIBCURL_VERSION_NUM >= 0x071301
357 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
358 #elif LIBCURL_VERSION_NUM >= 0x071101
359 curl_easy_setopt(result, CURLOPT_POST301, 1);
360 #endif
361 #if LIBCURL_VERSION_NUM >= 0x071304
362 if (is_transport_allowed("http"))
363 allowed_protocols |= CURLPROTO_HTTP;
364 if (is_transport_allowed("https"))
365 allowed_protocols |= CURLPROTO_HTTPS;
366 if (is_transport_allowed("ftp"))
367 allowed_protocols |= CURLPROTO_FTP;
368 if (is_transport_allowed("ftps"))
369 allowed_protocols |= CURLPROTO_FTPS;
370 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
371 #else
372 if (transport_restrict_protocols())
373 warning("protocol restrictions not applied to curl redirects because\n"
374 "your curl version is too old (>= 7.19.4)");
375 #endif
376
377 if (getenv("GIT_CURL_VERBOSE"))
378 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
379
380 curl_easy_setopt(result, CURLOPT_USERAGENT,
381 user_agent ? user_agent : git_user_agent());
382
383 if (curl_ftp_no_epsv)
384 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
385
386 #ifdef CURLOPT_USE_SSL
387 if (curl_ssl_try)
388 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
389 #endif
390
391 if (curl_http_proxy) {
392 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
393 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
394 }
395
396 set_curl_keepalive(result);
397
398 return result;
399 }
400
401 static void set_from_env(const char **var, const char *envname)
402 {
403 const char *val = getenv(envname);
404 if (val)
405 *var = val;
406 }
407
408 void http_init(struct remote *remote, const char *url, int proactive_auth)
409 {
410 char *low_speed_limit;
411 char *low_speed_time;
412 char *normalized_url;
413 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
414
415 config.section = "http";
416 config.key = NULL;
417 config.collect_fn = http_options;
418 config.cascade_fn = git_default_config;
419 config.cb = NULL;
420
421 http_is_verbose = 0;
422 normalized_url = url_normalize(url, &config.url);
423
424 git_config(urlmatch_config_entry, &config);
425 free(normalized_url);
426
427 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
428 die("curl_global_init failed");
429
430 http_proactive_auth = proactive_auth;
431
432 if (remote && remote->http_proxy)
433 curl_http_proxy = xstrdup(remote->http_proxy);
434
435 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
436 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
437
438 #ifdef USE_CURL_MULTI
439 {
440 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
441 if (http_max_requests != NULL)
442 max_requests = atoi(http_max_requests);
443 }
444
445 curlm = curl_multi_init();
446 if (!curlm)
447 die("curl_multi_init failed");
448 #endif
449
450 if (getenv("GIT_SSL_NO_VERIFY"))
451 curl_ssl_verify = 0;
452
453 set_from_env(&ssl_cert, "GIT_SSL_CERT");
454 #if LIBCURL_VERSION_NUM >= 0x070903
455 set_from_env(&ssl_key, "GIT_SSL_KEY");
456 #endif
457 #if LIBCURL_VERSION_NUM >= 0x070908
458 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
459 #endif
460 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
461
462 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
463
464 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
465 if (low_speed_limit != NULL)
466 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
467 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
468 if (low_speed_time != NULL)
469 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
470
471 if (curl_ssl_verify == -1)
472 curl_ssl_verify = 1;
473
474 curl_session_count = 0;
475 #ifdef USE_CURL_MULTI
476 if (max_requests < 1)
477 max_requests = DEFAULT_MAX_REQUESTS;
478 #endif
479
480 if (getenv("GIT_CURL_FTP_NO_EPSV"))
481 curl_ftp_no_epsv = 1;
482
483 if (url) {
484 credential_from_url(&http_auth, url);
485 if (!ssl_cert_password_required &&
486 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
487 starts_with(url, "https://"))
488 ssl_cert_password_required = 1;
489 }
490
491 #ifndef NO_CURL_EASY_DUPHANDLE
492 curl_default = get_curl_handle();
493 #endif
494 }
495
496 void http_cleanup(void)
497 {
498 struct active_request_slot *slot = active_queue_head;
499
500 while (slot != NULL) {
501 struct active_request_slot *next = slot->next;
502 if (slot->curl != NULL) {
503 #ifdef USE_CURL_MULTI
504 curl_multi_remove_handle(curlm, slot->curl);
505 #endif
506 curl_easy_cleanup(slot->curl);
507 }
508 free(slot);
509 slot = next;
510 }
511 active_queue_head = NULL;
512
513 #ifndef NO_CURL_EASY_DUPHANDLE
514 curl_easy_cleanup(curl_default);
515 #endif
516
517 #ifdef USE_CURL_MULTI
518 curl_multi_cleanup(curlm);
519 #endif
520 curl_global_cleanup();
521
522 curl_slist_free_all(pragma_header);
523 pragma_header = NULL;
524
525 curl_slist_free_all(no_pragma_header);
526 no_pragma_header = NULL;
527
528 if (curl_http_proxy) {
529 free((void *)curl_http_proxy);
530 curl_http_proxy = NULL;
531 }
532
533 if (cert_auth.password != NULL) {
534 memset(cert_auth.password, 0, strlen(cert_auth.password));
535 free(cert_auth.password);
536 cert_auth.password = NULL;
537 }
538 ssl_cert_password_required = 0;
539 }
540
541 struct active_request_slot *get_active_slot(void)
542 {
543 struct active_request_slot *slot = active_queue_head;
544 struct active_request_slot *newslot;
545
546 #ifdef USE_CURL_MULTI
547 int num_transfers;
548
549 /* Wait for a slot to open up if the queue is full */
550 while (active_requests >= max_requests) {
551 curl_multi_perform(curlm, &num_transfers);
552 if (num_transfers < active_requests)
553 process_curl_messages();
554 }
555 #endif
556
557 while (slot != NULL && slot->in_use)
558 slot = slot->next;
559
560 if (slot == NULL) {
561 newslot = xmalloc(sizeof(*newslot));
562 newslot->curl = NULL;
563 newslot->in_use = 0;
564 newslot->next = NULL;
565
566 slot = active_queue_head;
567 if (slot == NULL) {
568 active_queue_head = newslot;
569 } else {
570 while (slot->next != NULL)
571 slot = slot->next;
572 slot->next = newslot;
573 }
574 slot = newslot;
575 }
576
577 if (slot->curl == NULL) {
578 #ifdef NO_CURL_EASY_DUPHANDLE
579 slot->curl = get_curl_handle();
580 #else
581 slot->curl = curl_easy_duphandle(curl_default);
582 #endif
583 curl_session_count++;
584 }
585
586 active_requests++;
587 slot->in_use = 1;
588 slot->results = NULL;
589 slot->finished = NULL;
590 slot->callback_data = NULL;
591 slot->callback_func = NULL;
592 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
593 if (curl_save_cookies)
594 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
595 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
596 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
597 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
598 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
599 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
600 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
601 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
602 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
603 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
604 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
605 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
606 #endif
607 if (http_auth.password)
608 init_curl_http_auth(slot->curl);
609
610 return slot;
611 }
612
613 int start_active_slot(struct active_request_slot *slot)
614 {
615 #ifdef USE_CURL_MULTI
616 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
617 int num_transfers;
618
619 if (curlm_result != CURLM_OK &&
620 curlm_result != CURLM_CALL_MULTI_PERFORM) {
621 active_requests--;
622 slot->in_use = 0;
623 return 0;
624 }
625
626 /*
627 * We know there must be something to do, since we just added
628 * something.
629 */
630 curl_multi_perform(curlm, &num_transfers);
631 #endif
632 return 1;
633 }
634
635 #ifdef USE_CURL_MULTI
636 struct fill_chain {
637 void *data;
638 int (*fill)(void *);
639 struct fill_chain *next;
640 };
641
642 static struct fill_chain *fill_cfg;
643
644 void add_fill_function(void *data, int (*fill)(void *))
645 {
646 struct fill_chain *new = xmalloc(sizeof(*new));
647 struct fill_chain **linkp = &fill_cfg;
648 new->data = data;
649 new->fill = fill;
650 new->next = NULL;
651 while (*linkp)
652 linkp = &(*linkp)->next;
653 *linkp = new;
654 }
655
656 void fill_active_slots(void)
657 {
658 struct active_request_slot *slot = active_queue_head;
659
660 while (active_requests < max_requests) {
661 struct fill_chain *fill;
662 for (fill = fill_cfg; fill; fill = fill->next)
663 if (fill->fill(fill->data))
664 break;
665
666 if (!fill)
667 break;
668 }
669
670 while (slot != NULL) {
671 if (!slot->in_use && slot->curl != NULL
672 && curl_session_count > min_curl_sessions) {
673 curl_easy_cleanup(slot->curl);
674 slot->curl = NULL;
675 curl_session_count--;
676 }
677 slot = slot->next;
678 }
679 }
680
681 void step_active_slots(void)
682 {
683 int num_transfers;
684 CURLMcode curlm_result;
685
686 do {
687 curlm_result = curl_multi_perform(curlm, &num_transfers);
688 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
689 if (num_transfers < active_requests) {
690 process_curl_messages();
691 fill_active_slots();
692 }
693 }
694 #endif
695
696 void run_active_slot(struct active_request_slot *slot)
697 {
698 #ifdef USE_CURL_MULTI
699 fd_set readfds;
700 fd_set writefds;
701 fd_set excfds;
702 int max_fd;
703 struct timeval select_timeout;
704 int finished = 0;
705
706 slot->finished = &finished;
707 while (!finished) {
708 step_active_slots();
709
710 if (slot->in_use) {
711 #if LIBCURL_VERSION_NUM >= 0x070f04
712 long curl_timeout;
713 curl_multi_timeout(curlm, &curl_timeout);
714 if (curl_timeout == 0) {
715 continue;
716 } else if (curl_timeout == -1) {
717 select_timeout.tv_sec = 0;
718 select_timeout.tv_usec = 50000;
719 } else {
720 select_timeout.tv_sec = curl_timeout / 1000;
721 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
722 }
723 #else
724 select_timeout.tv_sec = 0;
725 select_timeout.tv_usec = 50000;
726 #endif
727
728 max_fd = -1;
729 FD_ZERO(&readfds);
730 FD_ZERO(&writefds);
731 FD_ZERO(&excfds);
732 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
733
734 /*
735 * It can happen that curl_multi_timeout returns a pathologically
736 * long timeout when curl_multi_fdset returns no file descriptors
737 * to read. See commit message for more details.
738 */
739 if (max_fd < 0 &&
740 (select_timeout.tv_sec > 0 ||
741 select_timeout.tv_usec > 50000)) {
742 select_timeout.tv_sec = 0;
743 select_timeout.tv_usec = 50000;
744 }
745
746 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
747 }
748 }
749 #else
750 while (slot->in_use) {
751 slot->curl_result = curl_easy_perform(slot->curl);
752 finish_active_slot(slot);
753 }
754 #endif
755 }
756
757 static void closedown_active_slot(struct active_request_slot *slot)
758 {
759 active_requests--;
760 slot->in_use = 0;
761 }
762
763 static void release_active_slot(struct active_request_slot *slot)
764 {
765 closedown_active_slot(slot);
766 if (slot->curl && curl_session_count > min_curl_sessions) {
767 #ifdef USE_CURL_MULTI
768 curl_multi_remove_handle(curlm, slot->curl);
769 #endif
770 curl_easy_cleanup(slot->curl);
771 slot->curl = NULL;
772 curl_session_count--;
773 }
774 #ifdef USE_CURL_MULTI
775 fill_active_slots();
776 #endif
777 }
778
779 void finish_active_slot(struct active_request_slot *slot)
780 {
781 closedown_active_slot(slot);
782 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
783
784 if (slot->finished != NULL)
785 (*slot->finished) = 1;
786
787 /* Store slot results so they can be read after the slot is reused */
788 if (slot->results != NULL) {
789 slot->results->curl_result = slot->curl_result;
790 slot->results->http_code = slot->http_code;
791 #if LIBCURL_VERSION_NUM >= 0x070a08
792 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
793 &slot->results->auth_avail);
794 #else
795 slot->results->auth_avail = 0;
796 #endif
797 }
798
799 /* Run callback if appropriate */
800 if (slot->callback_func != NULL)
801 slot->callback_func(slot->callback_data);
802 }
803
804 void finish_all_active_slots(void)
805 {
806 struct active_request_slot *slot = active_queue_head;
807
808 while (slot != NULL)
809 if (slot->in_use) {
810 run_active_slot(slot);
811 slot = active_queue_head;
812 } else {
813 slot = slot->next;
814 }
815 }
816
817 /* Helpers for modifying and creating URLs */
818 static inline int needs_quote(int ch)
819 {
820 if (((ch >= 'A') && (ch <= 'Z'))
821 || ((ch >= 'a') && (ch <= 'z'))
822 || ((ch >= '0') && (ch <= '9'))
823 || (ch == '/')
824 || (ch == '-')
825 || (ch == '.'))
826 return 0;
827 return 1;
828 }
829
830 static char *quote_ref_url(const char *base, const char *ref)
831 {
832 struct strbuf buf = STRBUF_INIT;
833 const char *cp;
834 int ch;
835
836 end_url_with_slash(&buf, base);
837
838 for (cp = ref; (ch = *cp) != 0; cp++)
839 if (needs_quote(ch))
840 strbuf_addf(&buf, "%%%02x", ch);
841 else
842 strbuf_addch(&buf, *cp);
843
844 return strbuf_detach(&buf, NULL);
845 }
846
847 void append_remote_object_url(struct strbuf *buf, const char *url,
848 const char *hex,
849 int only_two_digit_prefix)
850 {
851 end_url_with_slash(buf, url);
852
853 strbuf_addf(buf, "objects/%.*s/", 2, hex);
854 if (!only_two_digit_prefix)
855 strbuf_addf(buf, "%s", hex+2);
856 }
857
858 char *get_remote_object_url(const char *url, const char *hex,
859 int only_two_digit_prefix)
860 {
861 struct strbuf buf = STRBUF_INIT;
862 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
863 return strbuf_detach(&buf, NULL);
864 }
865
866 int handle_curl_result(struct slot_results *results)
867 {
868 /*
869 * If we see a failing http code with CURLE_OK, we have turned off
870 * FAILONERROR (to keep the server's custom error response), and should
871 * translate the code into failure here.
872 */
873 if (results->curl_result == CURLE_OK &&
874 results->http_code >= 400) {
875 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
876 /*
877 * Normally curl will already have put the "reason phrase"
878 * from the server into curl_errorstr; unfortunately without
879 * FAILONERROR it is lost, so we can give only the numeric
880 * status code.
881 */
882 snprintf(curl_errorstr, sizeof(curl_errorstr),
883 "The requested URL returned error: %ld",
884 results->http_code);
885 }
886
887 if (results->curl_result == CURLE_OK) {
888 credential_approve(&http_auth);
889 return HTTP_OK;
890 } else if (missing_target(results))
891 return HTTP_MISSING_TARGET;
892 else if (results->http_code == 401) {
893 if (http_auth.username && http_auth.password) {
894 credential_reject(&http_auth);
895 return HTTP_NOAUTH;
896 } else {
897 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
898 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
899 #endif
900 return HTTP_REAUTH;
901 }
902 } else {
903 #if LIBCURL_VERSION_NUM >= 0x070c00
904 if (!curl_errorstr[0])
905 strlcpy(curl_errorstr,
906 curl_easy_strerror(results->curl_result),
907 sizeof(curl_errorstr));
908 #endif
909 return HTTP_ERROR;
910 }
911 }
912
913 int run_one_slot(struct active_request_slot *slot,
914 struct slot_results *results)
915 {
916 slot->results = results;
917 if (!start_active_slot(slot)) {
918 snprintf(curl_errorstr, sizeof(curl_errorstr),
919 "failed to start HTTP request");
920 return HTTP_START_FAILED;
921 }
922
923 run_active_slot(slot);
924 return handle_curl_result(results);
925 }
926
927 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
928 {
929 char *ptr;
930 CURLcode ret;
931
932 strbuf_reset(buf);
933 ret = curl_easy_getinfo(curl, info, &ptr);
934 if (!ret && ptr)
935 strbuf_addstr(buf, ptr);
936 return ret;
937 }
938
939 /*
940 * Check for and extract a content-type parameter. "raw"
941 * should be positioned at the start of the potential
942 * parameter, with any whitespace already removed.
943 *
944 * "name" is the name of the parameter. The value is appended
945 * to "out".
946 */
947 static int extract_param(const char *raw, const char *name,
948 struct strbuf *out)
949 {
950 size_t len = strlen(name);
951
952 if (strncasecmp(raw, name, len))
953 return -1;
954 raw += len;
955
956 if (*raw != '=')
957 return -1;
958 raw++;
959
960 while (*raw && !isspace(*raw) && *raw != ';')
961 strbuf_addch(out, *raw++);
962 return 0;
963 }
964
965 /*
966 * Extract a normalized version of the content type, with any
967 * spaces suppressed, all letters lowercased, and no trailing ";"
968 * or parameters.
969 *
970 * Note that we will silently remove even invalid whitespace. For
971 * example, "text / plain" is specifically forbidden by RFC 2616,
972 * but "text/plain" is the only reasonable output, and this keeps
973 * our code simple.
974 *
975 * If the "charset" argument is not NULL, store the value of any
976 * charset parameter there.
977 *
978 * Example:
979 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
980 * "text / plain" -> "text/plain"
981 */
982 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
983 struct strbuf *charset)
984 {
985 const char *p;
986
987 strbuf_reset(type);
988 strbuf_grow(type, raw->len);
989 for (p = raw->buf; *p; p++) {
990 if (isspace(*p))
991 continue;
992 if (*p == ';') {
993 p++;
994 break;
995 }
996 strbuf_addch(type, tolower(*p));
997 }
998
999 if (!charset)
1000 return;
1001
1002 strbuf_reset(charset);
1003 while (*p) {
1004 while (isspace(*p) || *p == ';')
1005 p++;
1006 if (!extract_param(p, "charset", charset))
1007 return;
1008 while (*p && !isspace(*p))
1009 p++;
1010 }
1011
1012 if (!charset->len && starts_with(type->buf, "text/"))
1013 strbuf_addstr(charset, "ISO-8859-1");
1014 }
1015
1016
1017 /* http_request() targets */
1018 #define HTTP_REQUEST_STRBUF 0
1019 #define HTTP_REQUEST_FILE 1
1020
1021 static int http_request(const char *url,
1022 void *result, int target,
1023 const struct http_get_options *options)
1024 {
1025 struct active_request_slot *slot;
1026 struct slot_results results;
1027 struct curl_slist *headers = NULL;
1028 struct strbuf buf = STRBUF_INIT;
1029 int ret;
1030
1031 slot = get_active_slot();
1032 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1033
1034 if (result == NULL) {
1035 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1036 } else {
1037 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1038 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1039
1040 if (target == HTTP_REQUEST_FILE) {
1041 long posn = ftell(result);
1042 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1043 fwrite);
1044 if (posn > 0) {
1045 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1046 headers = curl_slist_append(headers, buf.buf);
1047 strbuf_reset(&buf);
1048 }
1049 } else
1050 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1051 fwrite_buffer);
1052 }
1053
1054 strbuf_addstr(&buf, "Pragma:");
1055 if (options && options->no_cache)
1056 strbuf_addstr(&buf, " no-cache");
1057 if (options && options->keep_error)
1058 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1059
1060 headers = curl_slist_append(headers, buf.buf);
1061
1062 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1063 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1064 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1065
1066 ret = run_one_slot(slot, &results);
1067
1068 if (options && options->content_type) {
1069 struct strbuf raw = STRBUF_INIT;
1070 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1071 extract_content_type(&raw, options->content_type,
1072 options->charset);
1073 strbuf_release(&raw);
1074 }
1075
1076 if (options && options->effective_url)
1077 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1078 options->effective_url);
1079
1080 curl_slist_free_all(headers);
1081 strbuf_release(&buf);
1082
1083 return ret;
1084 }
1085
1086 /*
1087 * Update the "base" url to a more appropriate value, as deduced by
1088 * redirects seen when requesting a URL starting with "url".
1089 *
1090 * The "asked" parameter is a URL that we asked curl to access, and must begin
1091 * with "base".
1092 *
1093 * The "got" parameter is the URL that curl reported to us as where we ended
1094 * up.
1095 *
1096 * Returns 1 if we updated the base url, 0 otherwise.
1097 *
1098 * Our basic strategy is to compare "base" and "asked" to find the bits
1099 * specific to our request. We then strip those bits off of "got" to yield the
1100 * new base. So for example, if our base is "http://example.com/foo.git",
1101 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1102 * with "https://other.example.com/foo.git/info/refs". We would want the
1103 * new URL to become "https://other.example.com/foo.git".
1104 *
1105 * Note that this assumes a sane redirect scheme. It's entirely possible
1106 * in the example above to end up at a URL that does not even end in
1107 * "info/refs". In such a case we simply punt, as there is not much we can
1108 * do (and such a scheme is unlikely to represent a real git repository,
1109 * which means we are likely about to abort anyway).
1110 */
1111 static int update_url_from_redirect(struct strbuf *base,
1112 const char *asked,
1113 const struct strbuf *got)
1114 {
1115 const char *tail;
1116 size_t tail_len;
1117
1118 if (!strcmp(asked, got->buf))
1119 return 0;
1120
1121 if (!skip_prefix(asked, base->buf, &tail))
1122 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1123 asked, base->buf);
1124
1125 tail_len = strlen(tail);
1126
1127 if (got->len < tail_len ||
1128 strcmp(tail, got->buf + got->len - tail_len))
1129 return 0; /* insane redirect scheme */
1130
1131 strbuf_reset(base);
1132 strbuf_add(base, got->buf, got->len - tail_len);
1133 return 1;
1134 }
1135
1136 static int http_request_reauth(const char *url,
1137 void *result, int target,
1138 struct http_get_options *options)
1139 {
1140 int ret = http_request(url, result, target, options);
1141
1142 if (options && options->effective_url && options->base_url) {
1143 if (update_url_from_redirect(options->base_url,
1144 url, options->effective_url)) {
1145 credential_from_url(&http_auth, options->base_url->buf);
1146 url = options->effective_url->buf;
1147 }
1148 }
1149
1150 if (ret != HTTP_REAUTH)
1151 return ret;
1152
1153 /*
1154 * If we are using KEEP_ERROR, the previous request may have
1155 * put cruft into our output stream; we should clear it out before
1156 * making our next request. We only know how to do this for
1157 * the strbuf case, but that is enough to satisfy current callers.
1158 */
1159 if (options && options->keep_error) {
1160 switch (target) {
1161 case HTTP_REQUEST_STRBUF:
1162 strbuf_reset(result);
1163 break;
1164 default:
1165 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1166 }
1167 }
1168
1169 credential_fill(&http_auth);
1170
1171 return http_request(url, result, target, options);
1172 }
1173
1174 int http_get_strbuf(const char *url,
1175 struct strbuf *result,
1176 struct http_get_options *options)
1177 {
1178 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1179 }
1180
1181 /*
1182 * Downloads a URL and stores the result in the given file.
1183 *
1184 * If a previous interrupted download is detected (i.e. a previous temporary
1185 * file is still around) the download is resumed.
1186 */
1187 static int http_get_file(const char *url, const char *filename,
1188 struct http_get_options *options)
1189 {
1190 int ret;
1191 struct strbuf tmpfile = STRBUF_INIT;
1192 FILE *result;
1193
1194 strbuf_addf(&tmpfile, "%s.temp", filename);
1195 result = fopen(tmpfile.buf, "a");
1196 if (!result) {
1197 error("Unable to open local file %s", tmpfile.buf);
1198 ret = HTTP_ERROR;
1199 goto cleanup;
1200 }
1201
1202 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1203 fclose(result);
1204
1205 if (ret == HTTP_OK && move_temp_to_file(tmpfile.buf, filename))
1206 ret = HTTP_ERROR;
1207 cleanup:
1208 strbuf_release(&tmpfile);
1209 return ret;
1210 }
1211
1212 int http_fetch_ref(const char *base, struct ref *ref)
1213 {
1214 struct http_get_options options = {0};
1215 char *url;
1216 struct strbuf buffer = STRBUF_INIT;
1217 int ret = -1;
1218
1219 options.no_cache = 1;
1220
1221 url = quote_ref_url(base, ref->name);
1222 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1223 strbuf_rtrim(&buffer);
1224 if (buffer.len == 40)
1225 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1226 else if (starts_with(buffer.buf, "ref: ")) {
1227 ref->symref = xstrdup(buffer.buf + 5);
1228 ret = 0;
1229 }
1230 }
1231
1232 strbuf_release(&buffer);
1233 free(url);
1234 return ret;
1235 }
1236
1237 /* Helpers for fetching packs */
1238 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1239 {
1240 char *url, *tmp;
1241 struct strbuf buf = STRBUF_INIT;
1242
1243 if (http_is_verbose)
1244 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1245
1246 end_url_with_slash(&buf, base_url);
1247 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1248 url = strbuf_detach(&buf, NULL);
1249
1250 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1251 tmp = strbuf_detach(&buf, NULL);
1252
1253 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1254 error("Unable to get pack index %s", url);
1255 free(tmp);
1256 tmp = NULL;
1257 }
1258
1259 free(url);
1260 return tmp;
1261 }
1262
1263 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1264 unsigned char *sha1, const char *base_url)
1265 {
1266 struct packed_git *new_pack;
1267 char *tmp_idx = NULL;
1268 int ret;
1269
1270 if (has_pack_index(sha1)) {
1271 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1272 if (!new_pack)
1273 return -1; /* parse_pack_index() already issued error message */
1274 goto add_pack;
1275 }
1276
1277 tmp_idx = fetch_pack_index(sha1, base_url);
1278 if (!tmp_idx)
1279 return -1;
1280
1281 new_pack = parse_pack_index(sha1, tmp_idx);
1282 if (!new_pack) {
1283 unlink(tmp_idx);
1284 free(tmp_idx);
1285
1286 return -1; /* parse_pack_index() already issued error message */
1287 }
1288
1289 ret = verify_pack_index(new_pack);
1290 if (!ret) {
1291 close_pack_index(new_pack);
1292 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1293 }
1294 free(tmp_idx);
1295 if (ret)
1296 return -1;
1297
1298 add_pack:
1299 new_pack->next = *packs_head;
1300 *packs_head = new_pack;
1301 return 0;
1302 }
1303
1304 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1305 {
1306 struct http_get_options options = {0};
1307 int ret = 0, i = 0;
1308 char *url, *data;
1309 struct strbuf buf = STRBUF_INIT;
1310 unsigned char sha1[20];
1311
1312 end_url_with_slash(&buf, base_url);
1313 strbuf_addstr(&buf, "objects/info/packs");
1314 url = strbuf_detach(&buf, NULL);
1315
1316 options.no_cache = 1;
1317 ret = http_get_strbuf(url, &buf, &options);
1318 if (ret != HTTP_OK)
1319 goto cleanup;
1320
1321 data = buf.buf;
1322 while (i < buf.len) {
1323 switch (data[i]) {
1324 case 'P':
1325 i++;
1326 if (i + 52 <= buf.len &&
1327 starts_with(data + i, " pack-") &&
1328 starts_with(data + i + 46, ".pack\n")) {
1329 get_sha1_hex(data + i + 6, sha1);
1330 fetch_and_setup_pack_index(packs_head, sha1,
1331 base_url);
1332 i += 51;
1333 break;
1334 }
1335 default:
1336 while (i < buf.len && data[i] != '\n')
1337 i++;
1338 }
1339 i++;
1340 }
1341
1342 cleanup:
1343 free(url);
1344 return ret;
1345 }
1346
1347 void release_http_pack_request(struct http_pack_request *preq)
1348 {
1349 if (preq->packfile != NULL) {
1350 fclose(preq->packfile);
1351 preq->packfile = NULL;
1352 }
1353 if (preq->range_header != NULL) {
1354 curl_slist_free_all(preq->range_header);
1355 preq->range_header = NULL;
1356 }
1357 preq->slot = NULL;
1358 free(preq->url);
1359 }
1360
1361 int finish_http_pack_request(struct http_pack_request *preq)
1362 {
1363 struct packed_git **lst;
1364 struct packed_git *p = preq->target;
1365 char *tmp_idx;
1366 struct child_process ip = CHILD_PROCESS_INIT;
1367 const char *ip_argv[8];
1368
1369 close_pack_index(p);
1370
1371 fclose(preq->packfile);
1372 preq->packfile = NULL;
1373
1374 lst = preq->lst;
1375 while (*lst != p)
1376 lst = &((*lst)->next);
1377 *lst = (*lst)->next;
1378
1379 tmp_idx = xstrdup(preq->tmpfile);
1380 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1381 ".idx.temp");
1382
1383 ip_argv[0] = "index-pack";
1384 ip_argv[1] = "-o";
1385 ip_argv[2] = tmp_idx;
1386 ip_argv[3] = preq->tmpfile;
1387 ip_argv[4] = NULL;
1388
1389 ip.argv = ip_argv;
1390 ip.git_cmd = 1;
1391 ip.no_stdin = 1;
1392 ip.no_stdout = 1;
1393
1394 if (run_command(&ip)) {
1395 unlink(preq->tmpfile);
1396 unlink(tmp_idx);
1397 free(tmp_idx);
1398 return -1;
1399 }
1400
1401 unlink(sha1_pack_index_name(p->sha1));
1402
1403 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1404 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1405 free(tmp_idx);
1406 return -1;
1407 }
1408
1409 install_packed_git(p);
1410 free(tmp_idx);
1411 return 0;
1412 }
1413
1414 struct http_pack_request *new_http_pack_request(
1415 struct packed_git *target, const char *base_url)
1416 {
1417 long prev_posn = 0;
1418 char range[RANGE_HEADER_SIZE];
1419 struct strbuf buf = STRBUF_INIT;
1420 struct http_pack_request *preq;
1421
1422 preq = xcalloc(1, sizeof(*preq));
1423 preq->target = target;
1424
1425 end_url_with_slash(&buf, base_url);
1426 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1427 sha1_to_hex(target->sha1));
1428 preq->url = strbuf_detach(&buf, NULL);
1429
1430 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1431 sha1_pack_name(target->sha1));
1432 preq->packfile = fopen(preq->tmpfile, "a");
1433 if (!preq->packfile) {
1434 error("Unable to open local file %s for pack",
1435 preq->tmpfile);
1436 goto abort;
1437 }
1438
1439 preq->slot = get_active_slot();
1440 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1441 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1442 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1443 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1444 no_pragma_header);
1445
1446 /*
1447 * If there is data present from a previous transfer attempt,
1448 * resume where it left off
1449 */
1450 prev_posn = ftell(preq->packfile);
1451 if (prev_posn>0) {
1452 if (http_is_verbose)
1453 fprintf(stderr,
1454 "Resuming fetch of pack %s at byte %ld\n",
1455 sha1_to_hex(target->sha1), prev_posn);
1456 sprintf(range, "Range: bytes=%ld-", prev_posn);
1457 preq->range_header = curl_slist_append(NULL, range);
1458 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1459 preq->range_header);
1460 }
1461
1462 return preq;
1463
1464 abort:
1465 free(preq->url);
1466 free(preq);
1467 return NULL;
1468 }
1469
1470 /* Helpers for fetching objects (loose) */
1471 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1472 void *data)
1473 {
1474 unsigned char expn[4096];
1475 size_t size = eltsize * nmemb;
1476 int posn = 0;
1477 struct http_object_request *freq =
1478 (struct http_object_request *)data;
1479 do {
1480 ssize_t retval = xwrite(freq->localfile,
1481 (char *) ptr + posn, size - posn);
1482 if (retval < 0)
1483 return posn;
1484 posn += retval;
1485 } while (posn < size);
1486
1487 freq->stream.avail_in = size;
1488 freq->stream.next_in = (void *)ptr;
1489 do {
1490 freq->stream.next_out = expn;
1491 freq->stream.avail_out = sizeof(expn);
1492 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1493 git_SHA1_Update(&freq->c, expn,
1494 sizeof(expn) - freq->stream.avail_out);
1495 } while (freq->stream.avail_in && freq->zret == Z_OK);
1496 return size;
1497 }
1498
1499 struct http_object_request *new_http_object_request(const char *base_url,
1500 unsigned char *sha1)
1501 {
1502 char *hex = sha1_to_hex(sha1);
1503 const char *filename;
1504 char prevfile[PATH_MAX];
1505 int prevlocal;
1506 char prev_buf[PREV_BUF_SIZE];
1507 ssize_t prev_read = 0;
1508 long prev_posn = 0;
1509 char range[RANGE_HEADER_SIZE];
1510 struct curl_slist *range_header = NULL;
1511 struct http_object_request *freq;
1512
1513 freq = xcalloc(1, sizeof(*freq));
1514 hashcpy(freq->sha1, sha1);
1515 freq->localfile = -1;
1516
1517 filename = sha1_file_name(sha1);
1518 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1519 "%s.temp", filename);
1520
1521 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1522 unlink_or_warn(prevfile);
1523 rename(freq->tmpfile, prevfile);
1524 unlink_or_warn(freq->tmpfile);
1525
1526 if (freq->localfile != -1)
1527 error("fd leakage in start: %d", freq->localfile);
1528 freq->localfile = open(freq->tmpfile,
1529 O_WRONLY | O_CREAT | O_EXCL, 0666);
1530 /*
1531 * This could have failed due to the "lazy directory creation";
1532 * try to mkdir the last path component.
1533 */
1534 if (freq->localfile < 0 && errno == ENOENT) {
1535 char *dir = strrchr(freq->tmpfile, '/');
1536 if (dir) {
1537 *dir = 0;
1538 mkdir(freq->tmpfile, 0777);
1539 *dir = '/';
1540 }
1541 freq->localfile = open(freq->tmpfile,
1542 O_WRONLY | O_CREAT | O_EXCL, 0666);
1543 }
1544
1545 if (freq->localfile < 0) {
1546 error("Couldn't create temporary file %s: %s",
1547 freq->tmpfile, strerror(errno));
1548 goto abort;
1549 }
1550
1551 git_inflate_init(&freq->stream);
1552
1553 git_SHA1_Init(&freq->c);
1554
1555 freq->url = get_remote_object_url(base_url, hex, 0);
1556
1557 /*
1558 * If a previous temp file is present, process what was already
1559 * fetched.
1560 */
1561 prevlocal = open(prevfile, O_RDONLY);
1562 if (prevlocal != -1) {
1563 do {
1564 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1565 if (prev_read>0) {
1566 if (fwrite_sha1_file(prev_buf,
1567 1,
1568 prev_read,
1569 freq) == prev_read) {
1570 prev_posn += prev_read;
1571 } else {
1572 prev_read = -1;
1573 }
1574 }
1575 } while (prev_read > 0);
1576 close(prevlocal);
1577 }
1578 unlink_or_warn(prevfile);
1579
1580 /*
1581 * Reset inflate/SHA1 if there was an error reading the previous temp
1582 * file; also rewind to the beginning of the local file.
1583 */
1584 if (prev_read == -1) {
1585 memset(&freq->stream, 0, sizeof(freq->stream));
1586 git_inflate_init(&freq->stream);
1587 git_SHA1_Init(&freq->c);
1588 if (prev_posn>0) {
1589 prev_posn = 0;
1590 lseek(freq->localfile, 0, SEEK_SET);
1591 if (ftruncate(freq->localfile, 0) < 0) {
1592 error("Couldn't truncate temporary file %s: %s",
1593 freq->tmpfile, strerror(errno));
1594 goto abort;
1595 }
1596 }
1597 }
1598
1599 freq->slot = get_active_slot();
1600
1601 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1602 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1603 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1604 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1605 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1606
1607 /*
1608 * If we have successfully processed data from a previous fetch
1609 * attempt, only fetch the data we don't already have.
1610 */
1611 if (prev_posn>0) {
1612 if (http_is_verbose)
1613 fprintf(stderr,
1614 "Resuming fetch of object %s at byte %ld\n",
1615 hex, prev_posn);
1616 sprintf(range, "Range: bytes=%ld-", prev_posn);
1617 range_header = curl_slist_append(range_header, range);
1618 curl_easy_setopt(freq->slot->curl,
1619 CURLOPT_HTTPHEADER, range_header);
1620 }
1621
1622 return freq;
1623
1624 abort:
1625 free(freq->url);
1626 free(freq);
1627 return NULL;
1628 }
1629
1630 void process_http_object_request(struct http_object_request *freq)
1631 {
1632 if (freq->slot == NULL)
1633 return;
1634 freq->curl_result = freq->slot->curl_result;
1635 freq->http_code = freq->slot->http_code;
1636 freq->slot = NULL;
1637 }
1638
1639 int finish_http_object_request(struct http_object_request *freq)
1640 {
1641 struct stat st;
1642
1643 close(freq->localfile);
1644 freq->localfile = -1;
1645
1646 process_http_object_request(freq);
1647
1648 if (freq->http_code == 416) {
1649 warning("requested range invalid; we may already have all the data.");
1650 } else if (freq->curl_result != CURLE_OK) {
1651 if (stat(freq->tmpfile, &st) == 0)
1652 if (st.st_size == 0)
1653 unlink_or_warn(freq->tmpfile);
1654 return -1;
1655 }
1656
1657 git_inflate_end(&freq->stream);
1658 git_SHA1_Final(freq->real_sha1, &freq->c);
1659 if (freq->zret != Z_STREAM_END) {
1660 unlink_or_warn(freq->tmpfile);
1661 return -1;
1662 }
1663 if (hashcmp(freq->sha1, freq->real_sha1)) {
1664 unlink_or_warn(freq->tmpfile);
1665 return -1;
1666 }
1667 freq->rename =
1668 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1669
1670 return freq->rename;
1671 }
1672
1673 void abort_http_object_request(struct http_object_request *freq)
1674 {
1675 unlink_or_warn(freq->tmpfile);
1676
1677 release_http_object_request(freq);
1678 }
1679
1680 void release_http_object_request(struct http_object_request *freq)
1681 {
1682 if (freq->localfile != -1) {
1683 close(freq->localfile);
1684 freq->localfile = -1;
1685 }
1686 if (freq->url != NULL) {
1687 free(freq->url);
1688 freq->url = NULL;
1689 }
1690 if (freq->slot != NULL) {
1691 freq->slot->callback_func = NULL;
1692 freq->slot->callback_data = NULL;
1693 release_active_slot(freq->slot);
1694 freq->slot = NULL;
1695 }
1696 }
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