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transport: refactor protocol whitelist code
[git/debian.git] / http.c
blob67986200655f88f5545e3df3669c2f4bbe688247
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
12 int active_requests;
13 int http_is_verbose;
14 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
15
16 #if LIBCURL_VERSION_NUM >= 0x070a06
17 #define LIBCURL_CAN_HANDLE_AUTH_ANY
18 #endif
19
20 static int min_curl_sessions = 1;
21 static int curl_session_count;
22 #ifdef USE_CURL_MULTI
23 static int max_requests = -1;
24 static CURLM *curlm;
25 #endif
26 #ifndef NO_CURL_EASY_DUPHANDLE
27 static CURL *curl_default;
28 #endif
29
30 #define PREV_BUF_SIZE 4096
31 #define RANGE_HEADER_SIZE 30
32
33 char curl_errorstr[CURL_ERROR_SIZE];
34
35 static int curl_ssl_verify = -1;
36 static int curl_ssl_try;
37 static const char *ssl_cert;
38 #if LIBCURL_VERSION_NUM >= 0x070903
39 static const char *ssl_key;
40 #endif
41 #if LIBCURL_VERSION_NUM >= 0x070908
42 static const char *ssl_capath;
43 #endif
44 static const char *ssl_cainfo;
45 static long curl_low_speed_limit = -1;
46 static long curl_low_speed_time = -1;
47 static int curl_ftp_no_epsv;
48 static const char *curl_http_proxy;
49 static const char *curl_cookie_file;
50 static int curl_save_cookies;
51 struct credential http_auth = CREDENTIAL_INIT;
52 static int http_proactive_auth;
53 static const char *user_agent;
54
55 #if LIBCURL_VERSION_NUM >= 0x071700
56 /* Use CURLOPT_KEYPASSWD as is */
57 #elif LIBCURL_VERSION_NUM >= 0x070903
58 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
59 #else
60 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
61 #endif
62
63 static struct credential cert_auth = CREDENTIAL_INIT;
64 static int ssl_cert_password_required;
65 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
66 static unsigned long http_auth_methods = CURLAUTH_ANY;
67 #endif
68
69 static struct curl_slist *pragma_header;
70 static struct curl_slist *no_pragma_header;
71
72 static struct active_request_slot *active_queue_head;
73
74 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
75 {
76 size_t size = eltsize * nmemb;
77 struct buffer *buffer = buffer_;
78
79 if (size > buffer->buf.len - buffer->posn)
80 size = buffer->buf.len - buffer->posn;
81 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
82 buffer->posn += size;
83
84 return size;
85 }
86
87 #ifndef NO_CURL_IOCTL
88 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
89 {
90 struct buffer *buffer = clientp;
91
92 switch (cmd) {
93 case CURLIOCMD_NOP:
94 return CURLIOE_OK;
95
96 case CURLIOCMD_RESTARTREAD:
97 buffer->posn = 0;
98 return CURLIOE_OK;
99
100 default:
101 return CURLIOE_UNKNOWNCMD;
102 }
103 }
104 #endif
105
106 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
107 {
108 size_t size = eltsize * nmemb;
109 struct strbuf *buffer = buffer_;
110
111 strbuf_add(buffer, ptr, size);
112 return size;
113 }
114
115 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
116 {
117 return eltsize * nmemb;
118 }
119
120 #ifdef USE_CURL_MULTI
121 static void process_curl_messages(void)
122 {
123 int num_messages;
124 struct active_request_slot *slot;
125 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
126
127 while (curl_message != NULL) {
128 if (curl_message->msg == CURLMSG_DONE) {
129 int curl_result = curl_message->data.result;
130 slot = active_queue_head;
131 while (slot != NULL &&
132 slot->curl != curl_message->easy_handle)
133 slot = slot->next;
134 if (slot != NULL) {
135 curl_multi_remove_handle(curlm, slot->curl);
136 slot->curl_result = curl_result;
137 finish_active_slot(slot);
138 } else {
139 fprintf(stderr, "Received DONE message for unknown request!\n");
140 }
141 } else {
142 fprintf(stderr, "Unknown CURL message received: %d\n",
143 (int)curl_message->msg);
144 }
145 curl_message = curl_multi_info_read(curlm, &num_messages);
146 }
147 }
148 #endif
149
150 static int http_options(const char *var, const char *value, void *cb)
151 {
152 if (!strcmp("http.sslverify", var)) {
153 curl_ssl_verify = git_config_bool(var, value);
154 return 0;
155 }
156 if (!strcmp("http.sslcert", var))
157 return git_config_string(&ssl_cert, var, value);
158 #if LIBCURL_VERSION_NUM >= 0x070903
159 if (!strcmp("http.sslkey", var))
160 return git_config_string(&ssl_key, var, value);
161 #endif
162 #if LIBCURL_VERSION_NUM >= 0x070908
163 if (!strcmp("http.sslcapath", var))
164 return git_config_string(&ssl_capath, var, value);
165 #endif
166 if (!strcmp("http.sslcainfo", var))
167 return git_config_string(&ssl_cainfo, var, value);
168 if (!strcmp("http.sslcertpasswordprotected", var)) {
169 ssl_cert_password_required = git_config_bool(var, value);
170 return 0;
171 }
172 if (!strcmp("http.ssltry", var)) {
173 curl_ssl_try = git_config_bool(var, value);
174 return 0;
175 }
176 if (!strcmp("http.minsessions", var)) {
177 min_curl_sessions = git_config_int(var, value);
178 #ifndef USE_CURL_MULTI
179 if (min_curl_sessions > 1)
180 min_curl_sessions = 1;
181 #endif
182 return 0;
183 }
184 #ifdef USE_CURL_MULTI
185 if (!strcmp("http.maxrequests", var)) {
186 max_requests = git_config_int(var, value);
187 return 0;
188 }
189 #endif
190 if (!strcmp("http.lowspeedlimit", var)) {
191 curl_low_speed_limit = (long)git_config_int(var, value);
192 return 0;
193 }
194 if (!strcmp("http.lowspeedtime", var)) {
195 curl_low_speed_time = (long)git_config_int(var, value);
196 return 0;
197 }
198
199 if (!strcmp("http.noepsv", var)) {
200 curl_ftp_no_epsv = git_config_bool(var, value);
201 return 0;
202 }
203 if (!strcmp("http.proxy", var))
204 return git_config_string(&curl_http_proxy, var, value);
205
206 if (!strcmp("http.cookiefile", var))
207 return git_config_string(&curl_cookie_file, var, value);
208 if (!strcmp("http.savecookies", var)) {
209 curl_save_cookies = git_config_bool(var, value);
210 return 0;
211 }
212
213 if (!strcmp("http.postbuffer", var)) {
214 http_post_buffer = git_config_int(var, value);
215 if (http_post_buffer < LARGE_PACKET_MAX)
216 http_post_buffer = LARGE_PACKET_MAX;
217 return 0;
218 }
219
220 if (!strcmp("http.useragent", var))
221 return git_config_string(&user_agent, var, value);
222
223 /* Fall back on the default ones */
224 return git_default_config(var, value, cb);
225 }
226
227 static void init_curl_http_auth(CURL *result)
228 {
229 if (!http_auth.username)
230 return;
231
232 credential_fill(&http_auth);
233
234 #if LIBCURL_VERSION_NUM >= 0x071301
235 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
236 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
237 #else
238 {
239 static struct strbuf up = STRBUF_INIT;
240 /*
241 * Note that we assume we only ever have a single set of
242 * credentials in a given program run, so we do not have
243 * to worry about updating this buffer, only setting its
244 * initial value.
245 */
246 if (!up.len)
247 strbuf_addf(&up, "%s:%s",
248 http_auth.username, http_auth.password);
249 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
250 }
251 #endif
252 }
253
254 static int has_cert_password(void)
255 {
256 if (ssl_cert == NULL || ssl_cert_password_required != 1)
257 return 0;
258 if (!cert_auth.password) {
259 cert_auth.protocol = xstrdup("cert");
260 cert_auth.username = xstrdup("");
261 cert_auth.path = xstrdup(ssl_cert);
262 credential_fill(&cert_auth);
263 }
264 return 1;
265 }
266
267 #if LIBCURL_VERSION_NUM >= 0x071900
268 static void set_curl_keepalive(CURL *c)
269 {
270 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
271 }
272
273 #elif LIBCURL_VERSION_NUM >= 0x071000
274 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
275 {
276 int ka = 1;
277 int rc;
278 socklen_t len = (socklen_t)sizeof(ka);
279
280 if (type != CURLSOCKTYPE_IPCXN)
281 return 0;
282
283 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
284 if (rc < 0)
285 warning("unable to set SO_KEEPALIVE on socket %s",
286 strerror(errno));
287
288 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
289 }
290
291 static void set_curl_keepalive(CURL *c)
292 {
293 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
294 }
295
296 #else
297 static void set_curl_keepalive(CURL *c)
298 {
299 /* not supported on older curl versions */
300 }
301 #endif
302
303 static CURL *get_curl_handle(void)
304 {
305 CURL *result = curl_easy_init();
306
307 if (!result)
308 die("curl_easy_init failed");
309
310 if (!curl_ssl_verify) {
311 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
312 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
313 } else {
314 /* Verify authenticity of the peer's certificate */
315 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
316 /* The name in the cert must match whom we tried to connect */
317 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
318 }
319
320 #if LIBCURL_VERSION_NUM >= 0x070907
321 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
322 #endif
323 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
324 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
325 #endif
326
327 if (http_proactive_auth)
328 init_curl_http_auth(result);
329
330 if (ssl_cert != NULL)
331 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
332 if (has_cert_password())
333 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
334 #if LIBCURL_VERSION_NUM >= 0x070903
335 if (ssl_key != NULL)
336 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
337 #endif
338 #if LIBCURL_VERSION_NUM >= 0x070908
339 if (ssl_capath != NULL)
340 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
341 #endif
342 if (ssl_cainfo != NULL)
343 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
344
345 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
346 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
347 curl_low_speed_limit);
348 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
349 curl_low_speed_time);
350 }
351
352 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
353 #if LIBCURL_VERSION_NUM >= 0x071301
354 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
355 #elif LIBCURL_VERSION_NUM >= 0x071101
356 curl_easy_setopt(result, CURLOPT_POST301, 1);
357 #endif
358
359 if (getenv("GIT_CURL_VERBOSE"))
360 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
361
362 curl_easy_setopt(result, CURLOPT_USERAGENT,
363 user_agent ? user_agent : git_user_agent());
364
365 if (curl_ftp_no_epsv)
366 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
367
368 #ifdef CURLOPT_USE_SSL
369 if (curl_ssl_try)
370 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
371 #endif
372
373 if (curl_http_proxy) {
374 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
375 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
376 }
377
378 set_curl_keepalive(result);
379
380 return result;
381 }
382
383 static void set_from_env(const char **var, const char *envname)
384 {
385 const char *val = getenv(envname);
386 if (val)
387 *var = val;
388 }
389
390 void http_init(struct remote *remote, const char *url, int proactive_auth)
391 {
392 char *low_speed_limit;
393 char *low_speed_time;
394 char *normalized_url;
395 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
396
397 config.section = "http";
398 config.key = NULL;
399 config.collect_fn = http_options;
400 config.cascade_fn = git_default_config;
401 config.cb = NULL;
402
403 http_is_verbose = 0;
404 normalized_url = url_normalize(url, &config.url);
405
406 git_config(urlmatch_config_entry, &config);
407 free(normalized_url);
408
409 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
410 die("curl_global_init failed");
411
412 http_proactive_auth = proactive_auth;
413
414 if (remote && remote->http_proxy)
415 curl_http_proxy = xstrdup(remote->http_proxy);
416
417 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
418 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
419
420 #ifdef USE_CURL_MULTI
421 {
422 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
423 if (http_max_requests != NULL)
424 max_requests = atoi(http_max_requests);
425 }
426
427 curlm = curl_multi_init();
428 if (!curlm)
429 die("curl_multi_init failed");
430 #endif
431
432 if (getenv("GIT_SSL_NO_VERIFY"))
433 curl_ssl_verify = 0;
434
435 set_from_env(&ssl_cert, "GIT_SSL_CERT");
436 #if LIBCURL_VERSION_NUM >= 0x070903
437 set_from_env(&ssl_key, "GIT_SSL_KEY");
438 #endif
439 #if LIBCURL_VERSION_NUM >= 0x070908
440 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
441 #endif
442 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
443
444 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
445
446 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
447 if (low_speed_limit != NULL)
448 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
449 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
450 if (low_speed_time != NULL)
451 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
452
453 if (curl_ssl_verify == -1)
454 curl_ssl_verify = 1;
455
456 curl_session_count = 0;
457 #ifdef USE_CURL_MULTI
458 if (max_requests < 1)
459 max_requests = DEFAULT_MAX_REQUESTS;
460 #endif
461
462 if (getenv("GIT_CURL_FTP_NO_EPSV"))
463 curl_ftp_no_epsv = 1;
464
465 if (url) {
466 credential_from_url(&http_auth, url);
467 if (!ssl_cert_password_required &&
468 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
469 starts_with(url, "https://"))
470 ssl_cert_password_required = 1;
471 }
472
473 #ifndef NO_CURL_EASY_DUPHANDLE
474 curl_default = get_curl_handle();
475 #endif
476 }
477
478 void http_cleanup(void)
479 {
480 struct active_request_slot *slot = active_queue_head;
481
482 while (slot != NULL) {
483 struct active_request_slot *next = slot->next;
484 if (slot->curl != NULL) {
485 #ifdef USE_CURL_MULTI
486 curl_multi_remove_handle(curlm, slot->curl);
487 #endif
488 curl_easy_cleanup(slot->curl);
489 }
490 free(slot);
491 slot = next;
492 }
493 active_queue_head = NULL;
494
495 #ifndef NO_CURL_EASY_DUPHANDLE
496 curl_easy_cleanup(curl_default);
497 #endif
498
499 #ifdef USE_CURL_MULTI
500 curl_multi_cleanup(curlm);
501 #endif
502 curl_global_cleanup();
503
504 curl_slist_free_all(pragma_header);
505 pragma_header = NULL;
506
507 curl_slist_free_all(no_pragma_header);
508 no_pragma_header = NULL;
509
510 if (curl_http_proxy) {
511 free((void *)curl_http_proxy);
512 curl_http_proxy = NULL;
513 }
514
515 if (cert_auth.password != NULL) {
516 memset(cert_auth.password, 0, strlen(cert_auth.password));
517 free(cert_auth.password);
518 cert_auth.password = NULL;
519 }
520 ssl_cert_password_required = 0;
521 }
522
523 struct active_request_slot *get_active_slot(void)
524 {
525 struct active_request_slot *slot = active_queue_head;
526 struct active_request_slot *newslot;
527
528 #ifdef USE_CURL_MULTI
529 int num_transfers;
530
531 /* Wait for a slot to open up if the queue is full */
532 while (active_requests >= max_requests) {
533 curl_multi_perform(curlm, &num_transfers);
534 if (num_transfers < active_requests)
535 process_curl_messages();
536 }
537 #endif
538
539 while (slot != NULL && slot->in_use)
540 slot = slot->next;
541
542 if (slot == NULL) {
543 newslot = xmalloc(sizeof(*newslot));
544 newslot->curl = NULL;
545 newslot->in_use = 0;
546 newslot->next = NULL;
547
548 slot = active_queue_head;
549 if (slot == NULL) {
550 active_queue_head = newslot;
551 } else {
552 while (slot->next != NULL)
553 slot = slot->next;
554 slot->next = newslot;
555 }
556 slot = newslot;
557 }
558
559 if (slot->curl == NULL) {
560 #ifdef NO_CURL_EASY_DUPHANDLE
561 slot->curl = get_curl_handle();
562 #else
563 slot->curl = curl_easy_duphandle(curl_default);
564 #endif
565 curl_session_count++;
566 }
567
568 active_requests++;
569 slot->in_use = 1;
570 slot->results = NULL;
571 slot->finished = NULL;
572 slot->callback_data = NULL;
573 slot->callback_func = NULL;
574 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
575 if (curl_save_cookies)
576 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
577 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
578 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
579 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
580 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
581 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
582 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
583 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
584 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
585 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
586 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
587 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
588 #endif
589 if (http_auth.password)
590 init_curl_http_auth(slot->curl);
591
592 return slot;
593 }
594
595 int start_active_slot(struct active_request_slot *slot)
596 {
597 #ifdef USE_CURL_MULTI
598 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
599 int num_transfers;
600
601 if (curlm_result != CURLM_OK &&
602 curlm_result != CURLM_CALL_MULTI_PERFORM) {
603 active_requests--;
604 slot->in_use = 0;
605 return 0;
606 }
607
608 /*
609 * We know there must be something to do, since we just added
610 * something.
611 */
612 curl_multi_perform(curlm, &num_transfers);
613 #endif
614 return 1;
615 }
616
617 #ifdef USE_CURL_MULTI
618 struct fill_chain {
619 void *data;
620 int (*fill)(void *);
621 struct fill_chain *next;
622 };
623
624 static struct fill_chain *fill_cfg;
625
626 void add_fill_function(void *data, int (*fill)(void *))
627 {
628 struct fill_chain *new = xmalloc(sizeof(*new));
629 struct fill_chain **linkp = &fill_cfg;
630 new->data = data;
631 new->fill = fill;
632 new->next = NULL;
633 while (*linkp)
634 linkp = &(*linkp)->next;
635 *linkp = new;
636 }
637
638 void fill_active_slots(void)
639 {
640 struct active_request_slot *slot = active_queue_head;
641
642 while (active_requests < max_requests) {
643 struct fill_chain *fill;
644 for (fill = fill_cfg; fill; fill = fill->next)
645 if (fill->fill(fill->data))
646 break;
647
648 if (!fill)
649 break;
650 }
651
652 while (slot != NULL) {
653 if (!slot->in_use && slot->curl != NULL
654 && curl_session_count > min_curl_sessions) {
655 curl_easy_cleanup(slot->curl);
656 slot->curl = NULL;
657 curl_session_count--;
658 }
659 slot = slot->next;
660 }
661 }
662
663 void step_active_slots(void)
664 {
665 int num_transfers;
666 CURLMcode curlm_result;
667
668 do {
669 curlm_result = curl_multi_perform(curlm, &num_transfers);
670 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
671 if (num_transfers < active_requests) {
672 process_curl_messages();
673 fill_active_slots();
674 }
675 }
676 #endif
677
678 void run_active_slot(struct active_request_slot *slot)
679 {
680 #ifdef USE_CURL_MULTI
681 fd_set readfds;
682 fd_set writefds;
683 fd_set excfds;
684 int max_fd;
685 struct timeval select_timeout;
686 int finished = 0;
687
688 slot->finished = &finished;
689 while (!finished) {
690 step_active_slots();
691
692 if (slot->in_use) {
693 #if LIBCURL_VERSION_NUM >= 0x070f04
694 long curl_timeout;
695 curl_multi_timeout(curlm, &curl_timeout);
696 if (curl_timeout == 0) {
697 continue;
698 } else if (curl_timeout == -1) {
699 select_timeout.tv_sec = 0;
700 select_timeout.tv_usec = 50000;
701 } else {
702 select_timeout.tv_sec = curl_timeout / 1000;
703 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
704 }
705 #else
706 select_timeout.tv_sec = 0;
707 select_timeout.tv_usec = 50000;
708 #endif
709
710 max_fd = -1;
711 FD_ZERO(&readfds);
712 FD_ZERO(&writefds);
713 FD_ZERO(&excfds);
714 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
715
716 /*
717 * It can happen that curl_multi_timeout returns a pathologically
718 * long timeout when curl_multi_fdset returns no file descriptors
719 * to read. See commit message for more details.
720 */
721 if (max_fd < 0 &&
722 (select_timeout.tv_sec > 0 ||
723 select_timeout.tv_usec > 50000)) {
724 select_timeout.tv_sec = 0;
725 select_timeout.tv_usec = 50000;
726 }
727
728 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
729 }
730 }
731 #else
732 while (slot->in_use) {
733 slot->curl_result = curl_easy_perform(slot->curl);
734 finish_active_slot(slot);
735 }
736 #endif
737 }
738
739 static void closedown_active_slot(struct active_request_slot *slot)
740 {
741 active_requests--;
742 slot->in_use = 0;
743 }
744
745 static void release_active_slot(struct active_request_slot *slot)
746 {
747 closedown_active_slot(slot);
748 if (slot->curl && curl_session_count > min_curl_sessions) {
749 #ifdef USE_CURL_MULTI
750 curl_multi_remove_handle(curlm, slot->curl);
751 #endif
752 curl_easy_cleanup(slot->curl);
753 slot->curl = NULL;
754 curl_session_count--;
755 }
756 #ifdef USE_CURL_MULTI
757 fill_active_slots();
758 #endif
759 }
760
761 void finish_active_slot(struct active_request_slot *slot)
762 {
763 closedown_active_slot(slot);
764 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
765
766 if (slot->finished != NULL)
767 (*slot->finished) = 1;
768
769 /* Store slot results so they can be read after the slot is reused */
770 if (slot->results != NULL) {
771 slot->results->curl_result = slot->curl_result;
772 slot->results->http_code = slot->http_code;
773 #if LIBCURL_VERSION_NUM >= 0x070a08
774 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
775 &slot->results->auth_avail);
776 #else
777 slot->results->auth_avail = 0;
778 #endif
779 }
780
781 /* Run callback if appropriate */
782 if (slot->callback_func != NULL)
783 slot->callback_func(slot->callback_data);
784 }
785
786 void finish_all_active_slots(void)
787 {
788 struct active_request_slot *slot = active_queue_head;
789
790 while (slot != NULL)
791 if (slot->in_use) {
792 run_active_slot(slot);
793 slot = active_queue_head;
794 } else {
795 slot = slot->next;
796 }
797 }
798
799 /* Helpers for modifying and creating URLs */
800 static inline int needs_quote(int ch)
801 {
802 if (((ch >= 'A') && (ch <= 'Z'))
803 || ((ch >= 'a') && (ch <= 'z'))
804 || ((ch >= '0') && (ch <= '9'))
805 || (ch == '/')
806 || (ch == '-')
807 || (ch == '.'))
808 return 0;
809 return 1;
810 }
811
812 static char *quote_ref_url(const char *base, const char *ref)
813 {
814 struct strbuf buf = STRBUF_INIT;
815 const char *cp;
816 int ch;
817
818 end_url_with_slash(&buf, base);
819
820 for (cp = ref; (ch = *cp) != 0; cp++)
821 if (needs_quote(ch))
822 strbuf_addf(&buf, "%%%02x", ch);
823 else
824 strbuf_addch(&buf, *cp);
825
826 return strbuf_detach(&buf, NULL);
827 }
828
829 void append_remote_object_url(struct strbuf *buf, const char *url,
830 const char *hex,
831 int only_two_digit_prefix)
832 {
833 end_url_with_slash(buf, url);
834
835 strbuf_addf(buf, "objects/%.*s/", 2, hex);
836 if (!only_two_digit_prefix)
837 strbuf_addf(buf, "%s", hex+2);
838 }
839
840 char *get_remote_object_url(const char *url, const char *hex,
841 int only_two_digit_prefix)
842 {
843 struct strbuf buf = STRBUF_INIT;
844 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
845 return strbuf_detach(&buf, NULL);
846 }
847
848 int handle_curl_result(struct slot_results *results)
849 {
850 /*
851 * If we see a failing http code with CURLE_OK, we have turned off
852 * FAILONERROR (to keep the server's custom error response), and should
853 * translate the code into failure here.
854 */
855 if (results->curl_result == CURLE_OK &&
856 results->http_code >= 400) {
857 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
858 /*
859 * Normally curl will already have put the "reason phrase"
860 * from the server into curl_errorstr; unfortunately without
861 * FAILONERROR it is lost, so we can give only the numeric
862 * status code.
863 */
864 snprintf(curl_errorstr, sizeof(curl_errorstr),
865 "The requested URL returned error: %ld",
866 results->http_code);
867 }
868
869 if (results->curl_result == CURLE_OK) {
870 credential_approve(&http_auth);
871 return HTTP_OK;
872 } else if (missing_target(results))
873 return HTTP_MISSING_TARGET;
874 else if (results->http_code == 401) {
875 if (http_auth.username && http_auth.password) {
876 credential_reject(&http_auth);
877 return HTTP_NOAUTH;
878 } else {
879 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
880 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
881 #endif
882 return HTTP_REAUTH;
883 }
884 } else {
885 #if LIBCURL_VERSION_NUM >= 0x070c00
886 if (!curl_errorstr[0])
887 strlcpy(curl_errorstr,
888 curl_easy_strerror(results->curl_result),
889 sizeof(curl_errorstr));
890 #endif
891 return HTTP_ERROR;
892 }
893 }
894
895 int run_one_slot(struct active_request_slot *slot,
896 struct slot_results *results)
897 {
898 slot->results = results;
899 if (!start_active_slot(slot)) {
900 snprintf(curl_errorstr, sizeof(curl_errorstr),
901 "failed to start HTTP request");
902 return HTTP_START_FAILED;
903 }
904
905 run_active_slot(slot);
906 return handle_curl_result(results);
907 }
908
909 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
910 {
911 char *ptr;
912 CURLcode ret;
913
914 strbuf_reset(buf);
915 ret = curl_easy_getinfo(curl, info, &ptr);
916 if (!ret && ptr)
917 strbuf_addstr(buf, ptr);
918 return ret;
919 }
920
921 /*
922 * Check for and extract a content-type parameter. "raw"
923 * should be positioned at the start of the potential
924 * parameter, with any whitespace already removed.
925 *
926 * "name" is the name of the parameter. The value is appended
927 * to "out".
928 */
929 static int extract_param(const char *raw, const char *name,
930 struct strbuf *out)
931 {
932 size_t len = strlen(name);
933
934 if (strncasecmp(raw, name, len))
935 return -1;
936 raw += len;
937
938 if (*raw != '=')
939 return -1;
940 raw++;
941
942 while (*raw && !isspace(*raw) && *raw != ';')
943 strbuf_addch(out, *raw++);
944 return 0;
945 }
946
947 /*
948 * Extract a normalized version of the content type, with any
949 * spaces suppressed, all letters lowercased, and no trailing ";"
950 * or parameters.
951 *
952 * Note that we will silently remove even invalid whitespace. For
953 * example, "text / plain" is specifically forbidden by RFC 2616,
954 * but "text/plain" is the only reasonable output, and this keeps
955 * our code simple.
956 *
957 * If the "charset" argument is not NULL, store the value of any
958 * charset parameter there.
959 *
960 * Example:
961 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
962 * "text / plain" -> "text/plain"
963 */
964 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
965 struct strbuf *charset)
966 {
967 const char *p;
968
969 strbuf_reset(type);
970 strbuf_grow(type, raw->len);
971 for (p = raw->buf; *p; p++) {
972 if (isspace(*p))
973 continue;
974 if (*p == ';') {
975 p++;
976 break;
977 }
978 strbuf_addch(type, tolower(*p));
979 }
980
981 if (!charset)
982 return;
983
984 strbuf_reset(charset);
985 while (*p) {
986 while (isspace(*p) || *p == ';')
987 p++;
988 if (!extract_param(p, "charset", charset))
989 return;
990 while (*p && !isspace(*p))
991 p++;
992 }
993
994 if (!charset->len && starts_with(type->buf, "text/"))
995 strbuf_addstr(charset, "ISO-8859-1");
996 }
997
998
999 /* http_request() targets */
1000 #define HTTP_REQUEST_STRBUF 0
1001 #define HTTP_REQUEST_FILE 1
1002
1003 static int http_request(const char *url,
1004 void *result, int target,
1005 const struct http_get_options *options)
1006 {
1007 struct active_request_slot *slot;
1008 struct slot_results results;
1009 struct curl_slist *headers = NULL;
1010 struct strbuf buf = STRBUF_INIT;
1011 int ret;
1012
1013 slot = get_active_slot();
1014 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1015
1016 if (result == NULL) {
1017 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1018 } else {
1019 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1020 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1021
1022 if (target == HTTP_REQUEST_FILE) {
1023 long posn = ftell(result);
1024 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1025 fwrite);
1026 if (posn > 0) {
1027 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1028 headers = curl_slist_append(headers, buf.buf);
1029 strbuf_reset(&buf);
1030 }
1031 } else
1032 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1033 fwrite_buffer);
1034 }
1035
1036 strbuf_addstr(&buf, "Pragma:");
1037 if (options && options->no_cache)
1038 strbuf_addstr(&buf, " no-cache");
1039 if (options && options->keep_error)
1040 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1041
1042 headers = curl_slist_append(headers, buf.buf);
1043
1044 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1045 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1046 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1047
1048 ret = run_one_slot(slot, &results);
1049
1050 if (options && options->content_type) {
1051 struct strbuf raw = STRBUF_INIT;
1052 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1053 extract_content_type(&raw, options->content_type,
1054 options->charset);
1055 strbuf_release(&raw);
1056 }
1057
1058 if (options && options->effective_url)
1059 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1060 options->effective_url);
1061
1062 curl_slist_free_all(headers);
1063 strbuf_release(&buf);
1064
1065 return ret;
1066 }
1067
1068 /*
1069 * Update the "base" url to a more appropriate value, as deduced by
1070 * redirects seen when requesting a URL starting with "url".
1071 *
1072 * The "asked" parameter is a URL that we asked curl to access, and must begin
1073 * with "base".
1074 *
1075 * The "got" parameter is the URL that curl reported to us as where we ended
1076 * up.
1077 *
1078 * Returns 1 if we updated the base url, 0 otherwise.
1079 *
1080 * Our basic strategy is to compare "base" and "asked" to find the bits
1081 * specific to our request. We then strip those bits off of "got" to yield the
1082 * new base. So for example, if our base is "http://example.com/foo.git",
1083 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1084 * with "https://other.example.com/foo.git/info/refs". We would want the
1085 * new URL to become "https://other.example.com/foo.git".
1086 *
1087 * Note that this assumes a sane redirect scheme. It's entirely possible
1088 * in the example above to end up at a URL that does not even end in
1089 * "info/refs". In such a case we simply punt, as there is not much we can
1090 * do (and such a scheme is unlikely to represent a real git repository,
1091 * which means we are likely about to abort anyway).
1092 */
1093 static int update_url_from_redirect(struct strbuf *base,
1094 const char *asked,
1095 const struct strbuf *got)
1096 {
1097 const char *tail;
1098 size_t tail_len;
1099
1100 if (!strcmp(asked, got->buf))
1101 return 0;
1102
1103 if (!skip_prefix(asked, base->buf, &tail))
1104 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1105 asked, base->buf);
1106
1107 tail_len = strlen(tail);
1108
1109 if (got->len < tail_len ||
1110 strcmp(tail, got->buf + got->len - tail_len))
1111 return 0; /* insane redirect scheme */
1112
1113 strbuf_reset(base);
1114 strbuf_add(base, got->buf, got->len - tail_len);
1115 return 1;
1116 }
1117
1118 static int http_request_reauth(const char *url,
1119 void *result, int target,
1120 struct http_get_options *options)
1121 {
1122 int ret = http_request(url, result, target, options);
1123
1124 if (options && options->effective_url && options->base_url) {
1125 if (update_url_from_redirect(options->base_url,
1126 url, options->effective_url)) {
1127 credential_from_url(&http_auth, options->base_url->buf);
1128 url = options->effective_url->buf;
1129 }
1130 }
1131
1132 if (ret != HTTP_REAUTH)
1133 return ret;
1134
1135 /*
1136 * If we are using KEEP_ERROR, the previous request may have
1137 * put cruft into our output stream; we should clear it out before
1138 * making our next request. We only know how to do this for
1139 * the strbuf case, but that is enough to satisfy current callers.
1140 */
1141 if (options && options->keep_error) {
1142 switch (target) {
1143 case HTTP_REQUEST_STRBUF:
1144 strbuf_reset(result);
1145 break;
1146 default:
1147 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1148 }
1149 }
1150
1151 credential_fill(&http_auth);
1152
1153 return http_request(url, result, target, options);
1154 }
1155
1156 int http_get_strbuf(const char *url,
1157 struct strbuf *result,
1158 struct http_get_options *options)
1159 {
1160 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1161 }
1162
1163 /*
1164 * Downloads a URL and stores the result in the given file.
1165 *
1166 * If a previous interrupted download is detected (i.e. a previous temporary
1167 * file is still around) the download is resumed.
1168 */
1169 static int http_get_file(const char *url, const char *filename,
1170 struct http_get_options *options)
1171 {
1172 int ret;
1173 struct strbuf tmpfile = STRBUF_INIT;
1174 FILE *result;
1175
1176 strbuf_addf(&tmpfile, "%s.temp", filename);
1177 result = fopen(tmpfile.buf, "a");
1178 if (!result) {
1179 error("Unable to open local file %s", tmpfile.buf);
1180 ret = HTTP_ERROR;
1181 goto cleanup;
1182 }
1183
1184 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1185 fclose(result);
1186
1187 if (ret == HTTP_OK && move_temp_to_file(tmpfile.buf, filename))
1188 ret = HTTP_ERROR;
1189 cleanup:
1190 strbuf_release(&tmpfile);
1191 return ret;
1192 }
1193
1194 int http_fetch_ref(const char *base, struct ref *ref)
1195 {
1196 struct http_get_options options = {0};
1197 char *url;
1198 struct strbuf buffer = STRBUF_INIT;
1199 int ret = -1;
1200
1201 options.no_cache = 1;
1202
1203 url = quote_ref_url(base, ref->name);
1204 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1205 strbuf_rtrim(&buffer);
1206 if (buffer.len == 40)
1207 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1208 else if (starts_with(buffer.buf, "ref: ")) {
1209 ref->symref = xstrdup(buffer.buf + 5);
1210 ret = 0;
1211 }
1212 }
1213
1214 strbuf_release(&buffer);
1215 free(url);
1216 return ret;
1217 }
1218
1219 /* Helpers for fetching packs */
1220 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1221 {
1222 char *url, *tmp;
1223 struct strbuf buf = STRBUF_INIT;
1224
1225 if (http_is_verbose)
1226 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1227
1228 end_url_with_slash(&buf, base_url);
1229 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1230 url = strbuf_detach(&buf, NULL);
1231
1232 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1233 tmp = strbuf_detach(&buf, NULL);
1234
1235 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1236 error("Unable to get pack index %s", url);
1237 free(tmp);
1238 tmp = NULL;
1239 }
1240
1241 free(url);
1242 return tmp;
1243 }
1244
1245 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1246 unsigned char *sha1, const char *base_url)
1247 {
1248 struct packed_git *new_pack;
1249 char *tmp_idx = NULL;
1250 int ret;
1251
1252 if (has_pack_index(sha1)) {
1253 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1254 if (!new_pack)
1255 return -1; /* parse_pack_index() already issued error message */
1256 goto add_pack;
1257 }
1258
1259 tmp_idx = fetch_pack_index(sha1, base_url);
1260 if (!tmp_idx)
1261 return -1;
1262
1263 new_pack = parse_pack_index(sha1, tmp_idx);
1264 if (!new_pack) {
1265 unlink(tmp_idx);
1266 free(tmp_idx);
1267
1268 return -1; /* parse_pack_index() already issued error message */
1269 }
1270
1271 ret = verify_pack_index(new_pack);
1272 if (!ret) {
1273 close_pack_index(new_pack);
1274 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1275 }
1276 free(tmp_idx);
1277 if (ret)
1278 return -1;
1279
1280 add_pack:
1281 new_pack->next = *packs_head;
1282 *packs_head = new_pack;
1283 return 0;
1284 }
1285
1286 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1287 {
1288 struct http_get_options options = {0};
1289 int ret = 0, i = 0;
1290 char *url, *data;
1291 struct strbuf buf = STRBUF_INIT;
1292 unsigned char sha1[20];
1293
1294 end_url_with_slash(&buf, base_url);
1295 strbuf_addstr(&buf, "objects/info/packs");
1296 url = strbuf_detach(&buf, NULL);
1297
1298 options.no_cache = 1;
1299 ret = http_get_strbuf(url, &buf, &options);
1300 if (ret != HTTP_OK)
1301 goto cleanup;
1302
1303 data = buf.buf;
1304 while (i < buf.len) {
1305 switch (data[i]) {
1306 case 'P':
1307 i++;
1308 if (i + 52 <= buf.len &&
1309 starts_with(data + i, " pack-") &&
1310 starts_with(data + i + 46, ".pack\n")) {
1311 get_sha1_hex(data + i + 6, sha1);
1312 fetch_and_setup_pack_index(packs_head, sha1,
1313 base_url);
1314 i += 51;
1315 break;
1316 }
1317 default:
1318 while (i < buf.len && data[i] != '\n')
1319 i++;
1320 }
1321 i++;
1322 }
1323
1324 cleanup:
1325 free(url);
1326 return ret;
1327 }
1328
1329 void release_http_pack_request(struct http_pack_request *preq)
1330 {
1331 if (preq->packfile != NULL) {
1332 fclose(preq->packfile);
1333 preq->packfile = NULL;
1334 }
1335 if (preq->range_header != NULL) {
1336 curl_slist_free_all(preq->range_header);
1337 preq->range_header = NULL;
1338 }
1339 preq->slot = NULL;
1340 free(preq->url);
1341 }
1342
1343 int finish_http_pack_request(struct http_pack_request *preq)
1344 {
1345 struct packed_git **lst;
1346 struct packed_git *p = preq->target;
1347 char *tmp_idx;
1348 struct child_process ip = CHILD_PROCESS_INIT;
1349 const char *ip_argv[8];
1350
1351 close_pack_index(p);
1352
1353 fclose(preq->packfile);
1354 preq->packfile = NULL;
1355
1356 lst = preq->lst;
1357 while (*lst != p)
1358 lst = &((*lst)->next);
1359 *lst = (*lst)->next;
1360
1361 tmp_idx = xstrdup(preq->tmpfile);
1362 strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1363 ".idx.temp");
1364
1365 ip_argv[0] = "index-pack";
1366 ip_argv[1] = "-o";
1367 ip_argv[2] = tmp_idx;
1368 ip_argv[3] = preq->tmpfile;
1369 ip_argv[4] = NULL;
1370
1371 ip.argv = ip_argv;
1372 ip.git_cmd = 1;
1373 ip.no_stdin = 1;
1374 ip.no_stdout = 1;
1375
1376 if (run_command(&ip)) {
1377 unlink(preq->tmpfile);
1378 unlink(tmp_idx);
1379 free(tmp_idx);
1380 return -1;
1381 }
1382
1383 unlink(sha1_pack_index_name(p->sha1));
1384
1385 if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1386 || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1387 free(tmp_idx);
1388 return -1;
1389 }
1390
1391 install_packed_git(p);
1392 free(tmp_idx);
1393 return 0;
1394 }
1395
1396 struct http_pack_request *new_http_pack_request(
1397 struct packed_git *target, const char *base_url)
1398 {
1399 long prev_posn = 0;
1400 char range[RANGE_HEADER_SIZE];
1401 struct strbuf buf = STRBUF_INIT;
1402 struct http_pack_request *preq;
1403
1404 preq = xcalloc(1, sizeof(*preq));
1405 preq->target = target;
1406
1407 end_url_with_slash(&buf, base_url);
1408 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1409 sha1_to_hex(target->sha1));
1410 preq->url = strbuf_detach(&buf, NULL);
1411
1412 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1413 sha1_pack_name(target->sha1));
1414 preq->packfile = fopen(preq->tmpfile, "a");
1415 if (!preq->packfile) {
1416 error("Unable to open local file %s for pack",
1417 preq->tmpfile);
1418 goto abort;
1419 }
1420
1421 preq->slot = get_active_slot();
1422 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1423 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1424 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1425 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1426 no_pragma_header);
1427
1428 /*
1429 * If there is data present from a previous transfer attempt,
1430 * resume where it left off
1431 */
1432 prev_posn = ftell(preq->packfile);
1433 if (prev_posn>0) {
1434 if (http_is_verbose)
1435 fprintf(stderr,
1436 "Resuming fetch of pack %s at byte %ld\n",
1437 sha1_to_hex(target->sha1), prev_posn);
1438 sprintf(range, "Range: bytes=%ld-", prev_posn);
1439 preq->range_header = curl_slist_append(NULL, range);
1440 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1441 preq->range_header);
1442 }
1443
1444 return preq;
1445
1446 abort:
1447 free(preq->url);
1448 free(preq);
1449 return NULL;
1450 }
1451
1452 /* Helpers for fetching objects (loose) */
1453 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1454 void *data)
1455 {
1456 unsigned char expn[4096];
1457 size_t size = eltsize * nmemb;
1458 int posn = 0;
1459 struct http_object_request *freq =
1460 (struct http_object_request *)data;
1461 do {
1462 ssize_t retval = xwrite(freq->localfile,
1463 (char *) ptr + posn, size - posn);
1464 if (retval < 0)
1465 return posn;
1466 posn += retval;
1467 } while (posn < size);
1468
1469 freq->stream.avail_in = size;
1470 freq->stream.next_in = (void *)ptr;
1471 do {
1472 freq->stream.next_out = expn;
1473 freq->stream.avail_out = sizeof(expn);
1474 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1475 git_SHA1_Update(&freq->c, expn,
1476 sizeof(expn) - freq->stream.avail_out);
1477 } while (freq->stream.avail_in && freq->zret == Z_OK);
1478 return size;
1479 }
1480
1481 struct http_object_request *new_http_object_request(const char *base_url,
1482 unsigned char *sha1)
1483 {
1484 char *hex = sha1_to_hex(sha1);
1485 const char *filename;
1486 char prevfile[PATH_MAX];
1487 int prevlocal;
1488 char prev_buf[PREV_BUF_SIZE];
1489 ssize_t prev_read = 0;
1490 long prev_posn = 0;
1491 char range[RANGE_HEADER_SIZE];
1492 struct curl_slist *range_header = NULL;
1493 struct http_object_request *freq;
1494
1495 freq = xcalloc(1, sizeof(*freq));
1496 hashcpy(freq->sha1, sha1);
1497 freq->localfile = -1;
1498
1499 filename = sha1_file_name(sha1);
1500 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1501 "%s.temp", filename);
1502
1503 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1504 unlink_or_warn(prevfile);
1505 rename(freq->tmpfile, prevfile);
1506 unlink_or_warn(freq->tmpfile);
1507
1508 if (freq->localfile != -1)
1509 error("fd leakage in start: %d", freq->localfile);
1510 freq->localfile = open(freq->tmpfile,
1511 O_WRONLY | O_CREAT | O_EXCL, 0666);
1512 /*
1513 * This could have failed due to the "lazy directory creation";
1514 * try to mkdir the last path component.
1515 */
1516 if (freq->localfile < 0 && errno == ENOENT) {
1517 char *dir = strrchr(freq->tmpfile, '/');
1518 if (dir) {
1519 *dir = 0;
1520 mkdir(freq->tmpfile, 0777);
1521 *dir = '/';
1522 }
1523 freq->localfile = open(freq->tmpfile,
1524 O_WRONLY | O_CREAT | O_EXCL, 0666);
1525 }
1526
1527 if (freq->localfile < 0) {
1528 error("Couldn't create temporary file %s: %s",
1529 freq->tmpfile, strerror(errno));
1530 goto abort;
1531 }
1532
1533 git_inflate_init(&freq->stream);
1534
1535 git_SHA1_Init(&freq->c);
1536
1537 freq->url = get_remote_object_url(base_url, hex, 0);
1538
1539 /*
1540 * If a previous temp file is present, process what was already
1541 * fetched.
1542 */
1543 prevlocal = open(prevfile, O_RDONLY);
1544 if (prevlocal != -1) {
1545 do {
1546 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1547 if (prev_read>0) {
1548 if (fwrite_sha1_file(prev_buf,
1549 1,
1550 prev_read,
1551 freq) == prev_read) {
1552 prev_posn += prev_read;
1553 } else {
1554 prev_read = -1;
1555 }
1556 }
1557 } while (prev_read > 0);
1558 close(prevlocal);
1559 }
1560 unlink_or_warn(prevfile);
1561
1562 /*
1563 * Reset inflate/SHA1 if there was an error reading the previous temp
1564 * file; also rewind to the beginning of the local file.
1565 */
1566 if (prev_read == -1) {
1567 memset(&freq->stream, 0, sizeof(freq->stream));
1568 git_inflate_init(&freq->stream);
1569 git_SHA1_Init(&freq->c);
1570 if (prev_posn>0) {
1571 prev_posn = 0;
1572 lseek(freq->localfile, 0, SEEK_SET);
1573 if (ftruncate(freq->localfile, 0) < 0) {
1574 error("Couldn't truncate temporary file %s: %s",
1575 freq->tmpfile, strerror(errno));
1576 goto abort;
1577 }
1578 }
1579 }
1580
1581 freq->slot = get_active_slot();
1582
1583 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1584 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1585 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1586 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1587 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1588
1589 /*
1590 * If we have successfully processed data from a previous fetch
1591 * attempt, only fetch the data we don't already have.
1592 */
1593 if (prev_posn>0) {
1594 if (http_is_verbose)
1595 fprintf(stderr,
1596 "Resuming fetch of object %s at byte %ld\n",
1597 hex, prev_posn);
1598 sprintf(range, "Range: bytes=%ld-", prev_posn);
1599 range_header = curl_slist_append(range_header, range);
1600 curl_easy_setopt(freq->slot->curl,
1601 CURLOPT_HTTPHEADER, range_header);
1602 }
1603
1604 return freq;
1605
1606 abort:
1607 free(freq->url);
1608 free(freq);
1609 return NULL;
1610 }
1611
1612 void process_http_object_request(struct http_object_request *freq)
1613 {
1614 if (freq->slot == NULL)
1615 return;
1616 freq->curl_result = freq->slot->curl_result;
1617 freq->http_code = freq->slot->http_code;
1618 freq->slot = NULL;
1619 }
1620
1621 int finish_http_object_request(struct http_object_request *freq)
1622 {
1623 struct stat st;
1624
1625 close(freq->localfile);
1626 freq->localfile = -1;
1627
1628 process_http_object_request(freq);
1629
1630 if (freq->http_code == 416) {
1631 warning("requested range invalid; we may already have all the data.");
1632 } else if (freq->curl_result != CURLE_OK) {
1633 if (stat(freq->tmpfile, &st) == 0)
1634 if (st.st_size == 0)
1635 unlink_or_warn(freq->tmpfile);
1636 return -1;
1637 }
1638
1639 git_inflate_end(&freq->stream);
1640 git_SHA1_Final(freq->real_sha1, &freq->c);
1641 if (freq->zret != Z_STREAM_END) {
1642 unlink_or_warn(freq->tmpfile);
1643 return -1;
1644 }
1645 if (hashcmp(freq->sha1, freq->real_sha1)) {
1646 unlink_or_warn(freq->tmpfile);
1647 return -1;
1648 }
1649 freq->rename =
1650 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1651
1652 return freq->rename;
1653 }
1654
1655 void abort_http_object_request(struct http_object_request *freq)
1656 {
1657 unlink_or_warn(freq->tmpfile);
1658
1659 release_http_object_request(freq);
1660 }
1661
1662 void release_http_object_request(struct http_object_request *freq)
1663 {
1664 if (freq->localfile != -1) {
1665 close(freq->localfile);
1666 freq->localfile = -1;
1667 }
1668 if (freq->url != NULL) {
1669 free(freq->url);
1670 freq->url = NULL;
1671 }
1672 if (freq->slot != NULL) {
1673 freq->slot->callback_func = NULL;
1674 freq->slot->callback_data = NULL;
1675 release_active_slot(freq->slot);
1676 freq->slot = NULL;
1677 }
1678 }
git for Debian