Merge branch 'jk/blame-first-parent' into maint
[git] / http.c
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 "gettext.h"
12 #include "transport.h"
13
14 int active_requests;
15 int http_is_verbose;
16 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
17
18 #if LIBCURL_VERSION_NUM >= 0x070a06
19 #define LIBCURL_CAN_HANDLE_AUTH_ANY
20 #endif
21
22 static int min_curl_sessions = 1;
23 static int curl_session_count;
24 #ifdef USE_CURL_MULTI
25 static int max_requests = -1;
26 static CURLM *curlm;
27 #endif
28 #ifndef NO_CURL_EASY_DUPHANDLE
29 static CURL *curl_default;
30 #endif
31
32 #define PREV_BUF_SIZE 4096
33 #define RANGE_HEADER_SIZE 30
34
35 char curl_errorstr[CURL_ERROR_SIZE];
36
37 static int curl_ssl_verify = -1;
38 static int curl_ssl_try;
39 static const char *ssl_cert;
40 static const char *ssl_cipherlist;
41 static const char *ssl_version;
42 static struct {
43         const char *name;
44         long ssl_version;
45 } sslversions[] = {
46         { "sslv2", CURL_SSLVERSION_SSLv2 },
47         { "sslv3", CURL_SSLVERSION_SSLv3 },
48         { "tlsv1", CURL_SSLVERSION_TLSv1 },
49 #if LIBCURL_VERSION_NUM >= 0x072200
50         { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
51         { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
52         { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
53 #endif
54 };
55 #if LIBCURL_VERSION_NUM >= 0x070903
56 static const char *ssl_key;
57 #endif
58 #if LIBCURL_VERSION_NUM >= 0x070908
59 static const char *ssl_capath;
60 #endif
61 static const char *ssl_cainfo;
62 static long curl_low_speed_limit = -1;
63 static long curl_low_speed_time = -1;
64 static int curl_ftp_no_epsv;
65 static const char *curl_http_proxy;
66 static const char *curl_cookie_file;
67 static int curl_save_cookies;
68 struct credential http_auth = CREDENTIAL_INIT;
69 static int http_proactive_auth;
70 static const char *user_agent;
71
72 #if LIBCURL_VERSION_NUM >= 0x071700
73 /* Use CURLOPT_KEYPASSWD as is */
74 #elif LIBCURL_VERSION_NUM >= 0x070903
75 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
76 #else
77 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
78 #endif
79
80 static struct credential cert_auth = CREDENTIAL_INIT;
81 static int ssl_cert_password_required;
82 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
83 static unsigned long http_auth_methods = CURLAUTH_ANY;
84 #endif
85
86 static struct curl_slist *pragma_header;
87 static struct curl_slist *no_pragma_header;
88
89 static struct active_request_slot *active_queue_head;
90
91 static char *cached_accept_language;
92
93 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
94 {
95         size_t size = eltsize * nmemb;
96         struct buffer *buffer = buffer_;
97
98         if (size > buffer->buf.len - buffer->posn)
99                 size = buffer->buf.len - buffer->posn;
100         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
101         buffer->posn += size;
102
103         return size;
104 }
105
106 #ifndef NO_CURL_IOCTL
107 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
108 {
109         struct buffer *buffer = clientp;
110
111         switch (cmd) {
112         case CURLIOCMD_NOP:
113                 return CURLIOE_OK;
114
115         case CURLIOCMD_RESTARTREAD:
116                 buffer->posn = 0;
117                 return CURLIOE_OK;
118
119         default:
120                 return CURLIOE_UNKNOWNCMD;
121         }
122 }
123 #endif
124
125 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
126 {
127         size_t size = eltsize * nmemb;
128         struct strbuf *buffer = buffer_;
129
130         strbuf_add(buffer, ptr, size);
131         return size;
132 }
133
134 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
135 {
136         return eltsize * nmemb;
137 }
138
139 static void closedown_active_slot(struct active_request_slot *slot)
140 {
141         active_requests--;
142         slot->in_use = 0;
143 }
144
145 static void finish_active_slot(struct active_request_slot *slot)
146 {
147         closedown_active_slot(slot);
148         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
149
150         if (slot->finished != NULL)
151                 (*slot->finished) = 1;
152
153         /* Store slot results so they can be read after the slot is reused */
154         if (slot->results != NULL) {
155                 slot->results->curl_result = slot->curl_result;
156                 slot->results->http_code = slot->http_code;
157 #if LIBCURL_VERSION_NUM >= 0x070a08
158                 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
159                                   &slot->results->auth_avail);
160 #else
161                 slot->results->auth_avail = 0;
162 #endif
163         }
164
165         /* Run callback if appropriate */
166         if (slot->callback_func != NULL)
167                 slot->callback_func(slot->callback_data);
168 }
169
170 #ifdef USE_CURL_MULTI
171 static void process_curl_messages(void)
172 {
173         int num_messages;
174         struct active_request_slot *slot;
175         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
176
177         while (curl_message != NULL) {
178                 if (curl_message->msg == CURLMSG_DONE) {
179                         int curl_result = curl_message->data.result;
180                         slot = active_queue_head;
181                         while (slot != NULL &&
182                                slot->curl != curl_message->easy_handle)
183                                 slot = slot->next;
184                         if (slot != NULL) {
185                                 curl_multi_remove_handle(curlm, slot->curl);
186                                 slot->curl_result = curl_result;
187                                 finish_active_slot(slot);
188                         } else {
189                                 fprintf(stderr, "Received DONE message for unknown request!\n");
190                         }
191                 } else {
192                         fprintf(stderr, "Unknown CURL message received: %d\n",
193                                 (int)curl_message->msg);
194                 }
195                 curl_message = curl_multi_info_read(curlm, &num_messages);
196         }
197 }
198 #endif
199
200 static int http_options(const char *var, const char *value, void *cb)
201 {
202         if (!strcmp("http.sslverify", var)) {
203                 curl_ssl_verify = git_config_bool(var, value);
204                 return 0;
205         }
206         if (!strcmp("http.sslcipherlist", var))
207                 return git_config_string(&ssl_cipherlist, var, value);
208         if (!strcmp("http.sslversion", var))
209                 return git_config_string(&ssl_version, var, value);
210         if (!strcmp("http.sslcert", var))
211                 return git_config_string(&ssl_cert, var, value);
212 #if LIBCURL_VERSION_NUM >= 0x070903
213         if (!strcmp("http.sslkey", var))
214                 return git_config_string(&ssl_key, var, value);
215 #endif
216 #if LIBCURL_VERSION_NUM >= 0x070908
217         if (!strcmp("http.sslcapath", var))
218                 return git_config_string(&ssl_capath, var, value);
219 #endif
220         if (!strcmp("http.sslcainfo", var))
221                 return git_config_string(&ssl_cainfo, var, value);
222         if (!strcmp("http.sslcertpasswordprotected", var)) {
223                 ssl_cert_password_required = git_config_bool(var, value);
224                 return 0;
225         }
226         if (!strcmp("http.ssltry", var)) {
227                 curl_ssl_try = git_config_bool(var, value);
228                 return 0;
229         }
230         if (!strcmp("http.minsessions", var)) {
231                 min_curl_sessions = git_config_int(var, value);
232 #ifndef USE_CURL_MULTI
233                 if (min_curl_sessions > 1)
234                         min_curl_sessions = 1;
235 #endif
236                 return 0;
237         }
238 #ifdef USE_CURL_MULTI
239         if (!strcmp("http.maxrequests", var)) {
240                 max_requests = git_config_int(var, value);
241                 return 0;
242         }
243 #endif
244         if (!strcmp("http.lowspeedlimit", var)) {
245                 curl_low_speed_limit = (long)git_config_int(var, value);
246                 return 0;
247         }
248         if (!strcmp("http.lowspeedtime", var)) {
249                 curl_low_speed_time = (long)git_config_int(var, value);
250                 return 0;
251         }
252
253         if (!strcmp("http.noepsv", var)) {
254                 curl_ftp_no_epsv = git_config_bool(var, value);
255                 return 0;
256         }
257         if (!strcmp("http.proxy", var))
258                 return git_config_string(&curl_http_proxy, var, value);
259
260         if (!strcmp("http.cookiefile", var))
261                 return git_config_string(&curl_cookie_file, var, value);
262         if (!strcmp("http.savecookies", var)) {
263                 curl_save_cookies = git_config_bool(var, value);
264                 return 0;
265         }
266
267         if (!strcmp("http.postbuffer", var)) {
268                 http_post_buffer = git_config_int(var, value);
269                 if (http_post_buffer < LARGE_PACKET_MAX)
270                         http_post_buffer = LARGE_PACKET_MAX;
271                 return 0;
272         }
273
274         if (!strcmp("http.useragent", var))
275                 return git_config_string(&user_agent, var, value);
276
277         /* Fall back on the default ones */
278         return git_default_config(var, value, cb);
279 }
280
281 static void init_curl_http_auth(CURL *result)
282 {
283         if (!http_auth.username)
284                 return;
285
286         credential_fill(&http_auth);
287
288 #if LIBCURL_VERSION_NUM >= 0x071301
289         curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
290         curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
291 #else
292         {
293                 static struct strbuf up = STRBUF_INIT;
294                 /*
295                  * Note that we assume we only ever have a single set of
296                  * credentials in a given program run, so we do not have
297                  * to worry about updating this buffer, only setting its
298                  * initial value.
299                  */
300                 if (!up.len)
301                         strbuf_addf(&up, "%s:%s",
302                                 http_auth.username, http_auth.password);
303                 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
304         }
305 #endif
306 }
307
308 static int has_cert_password(void)
309 {
310         if (ssl_cert == NULL || ssl_cert_password_required != 1)
311                 return 0;
312         if (!cert_auth.password) {
313                 cert_auth.protocol = xstrdup("cert");
314                 cert_auth.username = xstrdup("");
315                 cert_auth.path = xstrdup(ssl_cert);
316                 credential_fill(&cert_auth);
317         }
318         return 1;
319 }
320
321 #if LIBCURL_VERSION_NUM >= 0x071900
322 static void set_curl_keepalive(CURL *c)
323 {
324         curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
325 }
326
327 #elif LIBCURL_VERSION_NUM >= 0x071000
328 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
329 {
330         int ka = 1;
331         int rc;
332         socklen_t len = (socklen_t)sizeof(ka);
333
334         if (type != CURLSOCKTYPE_IPCXN)
335                 return 0;
336
337         rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
338         if (rc < 0)
339                 warning("unable to set SO_KEEPALIVE on socket %s",
340                         strerror(errno));
341
342         return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
343 }
344
345 static void set_curl_keepalive(CURL *c)
346 {
347         curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
348 }
349
350 #else
351 static void set_curl_keepalive(CURL *c)
352 {
353         /* not supported on older curl versions */
354 }
355 #endif
356
357 static CURL *get_curl_handle(void)
358 {
359         CURL *result = curl_easy_init();
360         long allowed_protocols = 0;
361
362         if (!result)
363                 die("curl_easy_init failed");
364
365         if (!curl_ssl_verify) {
366                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
367                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
368         } else {
369                 /* Verify authenticity of the peer's certificate */
370                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
371                 /* The name in the cert must match whom we tried to connect */
372                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
373         }
374
375 #if LIBCURL_VERSION_NUM >= 0x070907
376         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
377 #endif
378 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
379         curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
380 #endif
381
382         if (http_proactive_auth)
383                 init_curl_http_auth(result);
384
385         if (getenv("GIT_SSL_VERSION"))
386                 ssl_version = getenv("GIT_SSL_VERSION");
387         if (ssl_version && *ssl_version) {
388                 int i;
389                 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
390                         if (!strcmp(ssl_version, sslversions[i].name)) {
391                                 curl_easy_setopt(result, CURLOPT_SSLVERSION,
392                                                  sslversions[i].ssl_version);
393                                 break;
394                         }
395                 }
396                 if (i == ARRAY_SIZE(sslversions))
397                         warning("unsupported ssl version %s: using default",
398                                 ssl_version);
399         }
400
401         if (getenv("GIT_SSL_CIPHER_LIST"))
402                 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
403         if (ssl_cipherlist != NULL && *ssl_cipherlist)
404                 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
405                                 ssl_cipherlist);
406
407         if (ssl_cert != NULL)
408                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
409         if (has_cert_password())
410                 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
411 #if LIBCURL_VERSION_NUM >= 0x070903
412         if (ssl_key != NULL)
413                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
414 #endif
415 #if LIBCURL_VERSION_NUM >= 0x070908
416         if (ssl_capath != NULL)
417                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
418 #endif
419         if (ssl_cainfo != NULL)
420                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
421
422         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
423                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
424                                  curl_low_speed_limit);
425                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
426                                  curl_low_speed_time);
427         }
428
429         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
430         curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
431 #if LIBCURL_VERSION_NUM >= 0x071301
432         curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
433 #elif LIBCURL_VERSION_NUM >= 0x071101
434         curl_easy_setopt(result, CURLOPT_POST301, 1);
435 #endif
436 #if LIBCURL_VERSION_NUM >= 0x071304
437         if (is_transport_allowed("http"))
438                 allowed_protocols |= CURLPROTO_HTTP;
439         if (is_transport_allowed("https"))
440                 allowed_protocols |= CURLPROTO_HTTPS;
441         if (is_transport_allowed("ftp"))
442                 allowed_protocols |= CURLPROTO_FTP;
443         if (is_transport_allowed("ftps"))
444                 allowed_protocols |= CURLPROTO_FTPS;
445         curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
446 #else
447         if (transport_restrict_protocols())
448                 warning("protocol restrictions not applied to curl redirects because\n"
449                         "your curl version is too old (>= 7.19.4)");
450 #endif
451
452         if (getenv("GIT_CURL_VERBOSE"))
453                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
454
455         curl_easy_setopt(result, CURLOPT_USERAGENT,
456                 user_agent ? user_agent : git_user_agent());
457
458         if (curl_ftp_no_epsv)
459                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
460
461 #ifdef CURLOPT_USE_SSL
462         if (curl_ssl_try)
463                 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
464 #endif
465
466         if (curl_http_proxy) {
467                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
468         }
469 #if LIBCURL_VERSION_NUM >= 0x070a07
470         curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
471 #endif
472
473         set_curl_keepalive(result);
474
475         return result;
476 }
477
478 static void set_from_env(const char **var, const char *envname)
479 {
480         const char *val = getenv(envname);
481         if (val)
482                 *var = val;
483 }
484
485 void http_init(struct remote *remote, const char *url, int proactive_auth)
486 {
487         char *low_speed_limit;
488         char *low_speed_time;
489         char *normalized_url;
490         struct urlmatch_config config = { STRING_LIST_INIT_DUP };
491
492         config.section = "http";
493         config.key = NULL;
494         config.collect_fn = http_options;
495         config.cascade_fn = git_default_config;
496         config.cb = NULL;
497
498         http_is_verbose = 0;
499         normalized_url = url_normalize(url, &config.url);
500
501         git_config(urlmatch_config_entry, &config);
502         free(normalized_url);
503
504         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
505                 die("curl_global_init failed");
506
507         http_proactive_auth = proactive_auth;
508
509         if (remote && remote->http_proxy)
510                 curl_http_proxy = xstrdup(remote->http_proxy);
511
512         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
513         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
514
515 #ifdef USE_CURL_MULTI
516         {
517                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
518                 if (http_max_requests != NULL)
519                         max_requests = atoi(http_max_requests);
520         }
521
522         curlm = curl_multi_init();
523         if (!curlm)
524                 die("curl_multi_init failed");
525 #endif
526
527         if (getenv("GIT_SSL_NO_VERIFY"))
528                 curl_ssl_verify = 0;
529
530         set_from_env(&ssl_cert, "GIT_SSL_CERT");
531 #if LIBCURL_VERSION_NUM >= 0x070903
532         set_from_env(&ssl_key, "GIT_SSL_KEY");
533 #endif
534 #if LIBCURL_VERSION_NUM >= 0x070908
535         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
536 #endif
537         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
538
539         set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
540
541         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
542         if (low_speed_limit != NULL)
543                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
544         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
545         if (low_speed_time != NULL)
546                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
547
548         if (curl_ssl_verify == -1)
549                 curl_ssl_verify = 1;
550
551         curl_session_count = 0;
552 #ifdef USE_CURL_MULTI
553         if (max_requests < 1)
554                 max_requests = DEFAULT_MAX_REQUESTS;
555 #endif
556
557         if (getenv("GIT_CURL_FTP_NO_EPSV"))
558                 curl_ftp_no_epsv = 1;
559
560         if (url) {
561                 credential_from_url(&http_auth, url);
562                 if (!ssl_cert_password_required &&
563                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
564                     starts_with(url, "https://"))
565                         ssl_cert_password_required = 1;
566         }
567
568 #ifndef NO_CURL_EASY_DUPHANDLE
569         curl_default = get_curl_handle();
570 #endif
571 }
572
573 void http_cleanup(void)
574 {
575         struct active_request_slot *slot = active_queue_head;
576
577         while (slot != NULL) {
578                 struct active_request_slot *next = slot->next;
579                 if (slot->curl != NULL) {
580 #ifdef USE_CURL_MULTI
581                         curl_multi_remove_handle(curlm, slot->curl);
582 #endif
583                         curl_easy_cleanup(slot->curl);
584                 }
585                 free(slot);
586                 slot = next;
587         }
588         active_queue_head = NULL;
589
590 #ifndef NO_CURL_EASY_DUPHANDLE
591         curl_easy_cleanup(curl_default);
592 #endif
593
594 #ifdef USE_CURL_MULTI
595         curl_multi_cleanup(curlm);
596 #endif
597         curl_global_cleanup();
598
599         curl_slist_free_all(pragma_header);
600         pragma_header = NULL;
601
602         curl_slist_free_all(no_pragma_header);
603         no_pragma_header = NULL;
604
605         if (curl_http_proxy) {
606                 free((void *)curl_http_proxy);
607                 curl_http_proxy = NULL;
608         }
609
610         if (cert_auth.password != NULL) {
611                 memset(cert_auth.password, 0, strlen(cert_auth.password));
612                 free(cert_auth.password);
613                 cert_auth.password = NULL;
614         }
615         ssl_cert_password_required = 0;
616
617         free(cached_accept_language);
618         cached_accept_language = NULL;
619 }
620
621 struct active_request_slot *get_active_slot(void)
622 {
623         struct active_request_slot *slot = active_queue_head;
624         struct active_request_slot *newslot;
625
626 #ifdef USE_CURL_MULTI
627         int num_transfers;
628
629         /* Wait for a slot to open up if the queue is full */
630         while (active_requests >= max_requests) {
631                 curl_multi_perform(curlm, &num_transfers);
632                 if (num_transfers < active_requests)
633                         process_curl_messages();
634         }
635 #endif
636
637         while (slot != NULL && slot->in_use)
638                 slot = slot->next;
639
640         if (slot == NULL) {
641                 newslot = xmalloc(sizeof(*newslot));
642                 newslot->curl = NULL;
643                 newslot->in_use = 0;
644                 newslot->next = NULL;
645
646                 slot = active_queue_head;
647                 if (slot == NULL) {
648                         active_queue_head = newslot;
649                 } else {
650                         while (slot->next != NULL)
651                                 slot = slot->next;
652                         slot->next = newslot;
653                 }
654                 slot = newslot;
655         }
656
657         if (slot->curl == NULL) {
658 #ifdef NO_CURL_EASY_DUPHANDLE
659                 slot->curl = get_curl_handle();
660 #else
661                 slot->curl = curl_easy_duphandle(curl_default);
662 #endif
663                 curl_session_count++;
664         }
665
666         active_requests++;
667         slot->in_use = 1;
668         slot->results = NULL;
669         slot->finished = NULL;
670         slot->callback_data = NULL;
671         slot->callback_func = NULL;
672         curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
673         if (curl_save_cookies)
674                 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
675         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
676         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
677         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
678         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
679         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
680         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
681         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
682         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
683         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
684 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
685         curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
686 #endif
687         if (http_auth.password)
688                 init_curl_http_auth(slot->curl);
689
690         return slot;
691 }
692
693 int start_active_slot(struct active_request_slot *slot)
694 {
695 #ifdef USE_CURL_MULTI
696         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
697         int num_transfers;
698
699         if (curlm_result != CURLM_OK &&
700             curlm_result != CURLM_CALL_MULTI_PERFORM) {
701                 active_requests--;
702                 slot->in_use = 0;
703                 return 0;
704         }
705
706         /*
707          * We know there must be something to do, since we just added
708          * something.
709          */
710         curl_multi_perform(curlm, &num_transfers);
711 #endif
712         return 1;
713 }
714
715 #ifdef USE_CURL_MULTI
716 struct fill_chain {
717         void *data;
718         int (*fill)(void *);
719         struct fill_chain *next;
720 };
721
722 static struct fill_chain *fill_cfg;
723
724 void add_fill_function(void *data, int (*fill)(void *))
725 {
726         struct fill_chain *new = xmalloc(sizeof(*new));
727         struct fill_chain **linkp = &fill_cfg;
728         new->data = data;
729         new->fill = fill;
730         new->next = NULL;
731         while (*linkp)
732                 linkp = &(*linkp)->next;
733         *linkp = new;
734 }
735
736 void fill_active_slots(void)
737 {
738         struct active_request_slot *slot = active_queue_head;
739
740         while (active_requests < max_requests) {
741                 struct fill_chain *fill;
742                 for (fill = fill_cfg; fill; fill = fill->next)
743                         if (fill->fill(fill->data))
744                                 break;
745
746                 if (!fill)
747                         break;
748         }
749
750         while (slot != NULL) {
751                 if (!slot->in_use && slot->curl != NULL
752                         && curl_session_count > min_curl_sessions) {
753                         curl_easy_cleanup(slot->curl);
754                         slot->curl = NULL;
755                         curl_session_count--;
756                 }
757                 slot = slot->next;
758         }
759 }
760
761 void step_active_slots(void)
762 {
763         int num_transfers;
764         CURLMcode curlm_result;
765
766         do {
767                 curlm_result = curl_multi_perform(curlm, &num_transfers);
768         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
769         if (num_transfers < active_requests) {
770                 process_curl_messages();
771                 fill_active_slots();
772         }
773 }
774 #endif
775
776 void run_active_slot(struct active_request_slot *slot)
777 {
778 #ifdef USE_CURL_MULTI
779         fd_set readfds;
780         fd_set writefds;
781         fd_set excfds;
782         int max_fd;
783         struct timeval select_timeout;
784         int finished = 0;
785
786         slot->finished = &finished;
787         while (!finished) {
788                 step_active_slots();
789
790                 if (slot->in_use) {
791 #if LIBCURL_VERSION_NUM >= 0x070f04
792                         long curl_timeout;
793                         curl_multi_timeout(curlm, &curl_timeout);
794                         if (curl_timeout == 0) {
795                                 continue;
796                         } else if (curl_timeout == -1) {
797                                 select_timeout.tv_sec  = 0;
798                                 select_timeout.tv_usec = 50000;
799                         } else {
800                                 select_timeout.tv_sec  =  curl_timeout / 1000;
801                                 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
802                         }
803 #else
804                         select_timeout.tv_sec  = 0;
805                         select_timeout.tv_usec = 50000;
806 #endif
807
808                         max_fd = -1;
809                         FD_ZERO(&readfds);
810                         FD_ZERO(&writefds);
811                         FD_ZERO(&excfds);
812                         curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
813
814                         /*
815                          * It can happen that curl_multi_timeout returns a pathologically
816                          * long timeout when curl_multi_fdset returns no file descriptors
817                          * to read.  See commit message for more details.
818                          */
819                         if (max_fd < 0 &&
820                             (select_timeout.tv_sec > 0 ||
821                              select_timeout.tv_usec > 50000)) {
822                                 select_timeout.tv_sec  = 0;
823                                 select_timeout.tv_usec = 50000;
824                         }
825
826                         select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
827                 }
828         }
829 #else
830         while (slot->in_use) {
831                 slot->curl_result = curl_easy_perform(slot->curl);
832                 finish_active_slot(slot);
833         }
834 #endif
835 }
836
837 static void release_active_slot(struct active_request_slot *slot)
838 {
839         closedown_active_slot(slot);
840         if (slot->curl && curl_session_count > min_curl_sessions) {
841 #ifdef USE_CURL_MULTI
842                 curl_multi_remove_handle(curlm, slot->curl);
843 #endif
844                 curl_easy_cleanup(slot->curl);
845                 slot->curl = NULL;
846                 curl_session_count--;
847         }
848 #ifdef USE_CURL_MULTI
849         fill_active_slots();
850 #endif
851 }
852
853 void finish_all_active_slots(void)
854 {
855         struct active_request_slot *slot = active_queue_head;
856
857         while (slot != NULL)
858                 if (slot->in_use) {
859                         run_active_slot(slot);
860                         slot = active_queue_head;
861                 } else {
862                         slot = slot->next;
863                 }
864 }
865
866 /* Helpers for modifying and creating URLs */
867 static inline int needs_quote(int ch)
868 {
869         if (((ch >= 'A') && (ch <= 'Z'))
870                         || ((ch >= 'a') && (ch <= 'z'))
871                         || ((ch >= '0') && (ch <= '9'))
872                         || (ch == '/')
873                         || (ch == '-')
874                         || (ch == '.'))
875                 return 0;
876         return 1;
877 }
878
879 static char *quote_ref_url(const char *base, const char *ref)
880 {
881         struct strbuf buf = STRBUF_INIT;
882         const char *cp;
883         int ch;
884
885         end_url_with_slash(&buf, base);
886
887         for (cp = ref; (ch = *cp) != 0; cp++)
888                 if (needs_quote(ch))
889                         strbuf_addf(&buf, "%%%02x", ch);
890                 else
891                         strbuf_addch(&buf, *cp);
892
893         return strbuf_detach(&buf, NULL);
894 }
895
896 void append_remote_object_url(struct strbuf *buf, const char *url,
897                               const char *hex,
898                               int only_two_digit_prefix)
899 {
900         end_url_with_slash(buf, url);
901
902         strbuf_addf(buf, "objects/%.*s/", 2, hex);
903         if (!only_two_digit_prefix)
904                 strbuf_addf(buf, "%s", hex+2);
905 }
906
907 char *get_remote_object_url(const char *url, const char *hex,
908                             int only_two_digit_prefix)
909 {
910         struct strbuf buf = STRBUF_INIT;
911         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
912         return strbuf_detach(&buf, NULL);
913 }
914
915 static int handle_curl_result(struct slot_results *results)
916 {
917         /*
918          * If we see a failing http code with CURLE_OK, we have turned off
919          * FAILONERROR (to keep the server's custom error response), and should
920          * translate the code into failure here.
921          */
922         if (results->curl_result == CURLE_OK &&
923             results->http_code >= 400) {
924                 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
925                 /*
926                  * Normally curl will already have put the "reason phrase"
927                  * from the server into curl_errorstr; unfortunately without
928                  * FAILONERROR it is lost, so we can give only the numeric
929                  * status code.
930                  */
931                 snprintf(curl_errorstr, sizeof(curl_errorstr),
932                          "The requested URL returned error: %ld",
933                          results->http_code);
934         }
935
936         if (results->curl_result == CURLE_OK) {
937                 credential_approve(&http_auth);
938                 return HTTP_OK;
939         } else if (missing_target(results))
940                 return HTTP_MISSING_TARGET;
941         else if (results->http_code == 401) {
942                 if (http_auth.username && http_auth.password) {
943                         credential_reject(&http_auth);
944                         return HTTP_NOAUTH;
945                 } else {
946 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
947                         http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
948 #endif
949                         return HTTP_REAUTH;
950                 }
951         } else {
952 #if LIBCURL_VERSION_NUM >= 0x070c00
953                 if (!curl_errorstr[0])
954                         strlcpy(curl_errorstr,
955                                 curl_easy_strerror(results->curl_result),
956                                 sizeof(curl_errorstr));
957 #endif
958                 return HTTP_ERROR;
959         }
960 }
961
962 int run_one_slot(struct active_request_slot *slot,
963                  struct slot_results *results)
964 {
965         slot->results = results;
966         if (!start_active_slot(slot)) {
967                 snprintf(curl_errorstr, sizeof(curl_errorstr),
968                          "failed to start HTTP request");
969                 return HTTP_START_FAILED;
970         }
971
972         run_active_slot(slot);
973         return handle_curl_result(results);
974 }
975
976 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
977 {
978         char *ptr;
979         CURLcode ret;
980
981         strbuf_reset(buf);
982         ret = curl_easy_getinfo(curl, info, &ptr);
983         if (!ret && ptr)
984                 strbuf_addstr(buf, ptr);
985         return ret;
986 }
987
988 /*
989  * Check for and extract a content-type parameter. "raw"
990  * should be positioned at the start of the potential
991  * parameter, with any whitespace already removed.
992  *
993  * "name" is the name of the parameter. The value is appended
994  * to "out".
995  */
996 static int extract_param(const char *raw, const char *name,
997                          struct strbuf *out)
998 {
999         size_t len = strlen(name);
1000
1001         if (strncasecmp(raw, name, len))
1002                 return -1;
1003         raw += len;
1004
1005         if (*raw != '=')
1006                 return -1;
1007         raw++;
1008
1009         while (*raw && !isspace(*raw) && *raw != ';')
1010                 strbuf_addch(out, *raw++);
1011         return 0;
1012 }
1013
1014 /*
1015  * Extract a normalized version of the content type, with any
1016  * spaces suppressed, all letters lowercased, and no trailing ";"
1017  * or parameters.
1018  *
1019  * Note that we will silently remove even invalid whitespace. For
1020  * example, "text / plain" is specifically forbidden by RFC 2616,
1021  * but "text/plain" is the only reasonable output, and this keeps
1022  * our code simple.
1023  *
1024  * If the "charset" argument is not NULL, store the value of any
1025  * charset parameter there.
1026  *
1027  * Example:
1028  *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1029  *   "text / plain" -> "text/plain"
1030  */
1031 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1032                                  struct strbuf *charset)
1033 {
1034         const char *p;
1035
1036         strbuf_reset(type);
1037         strbuf_grow(type, raw->len);
1038         for (p = raw->buf; *p; p++) {
1039                 if (isspace(*p))
1040                         continue;
1041                 if (*p == ';') {
1042                         p++;
1043                         break;
1044                 }
1045                 strbuf_addch(type, tolower(*p));
1046         }
1047
1048         if (!charset)
1049                 return;
1050
1051         strbuf_reset(charset);
1052         while (*p) {
1053                 while (isspace(*p) || *p == ';')
1054                         p++;
1055                 if (!extract_param(p, "charset", charset))
1056                         return;
1057                 while (*p && !isspace(*p))
1058                         p++;
1059         }
1060
1061         if (!charset->len && starts_with(type->buf, "text/"))
1062                 strbuf_addstr(charset, "ISO-8859-1");
1063 }
1064
1065 static void write_accept_language(struct strbuf *buf)
1066 {
1067         /*
1068          * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1069          * that, q-value will be smaller than 0.001, the minimum q-value the
1070          * HTTP specification allows. See
1071          * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1072          */
1073         const int MAX_DECIMAL_PLACES = 3;
1074         const int MAX_LANGUAGE_TAGS = 1000;
1075         const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1076         char **language_tags = NULL;
1077         int num_langs = 0;
1078         const char *s = get_preferred_languages();
1079         int i;
1080         struct strbuf tag = STRBUF_INIT;
1081
1082         /* Don't add Accept-Language header if no language is preferred. */
1083         if (!s)
1084                 return;
1085
1086         /*
1087          * Split the colon-separated string of preferred languages into
1088          * language_tags array.
1089          */
1090         do {
1091                 /* collect language tag */
1092                 for (; *s && (isalnum(*s) || *s == '_'); s++)
1093                         strbuf_addch(&tag, *s == '_' ? '-' : *s);
1094
1095                 /* skip .codeset, @modifier and any other unnecessary parts */
1096                 while (*s && *s != ':')
1097                         s++;
1098
1099                 if (tag.len) {
1100                         num_langs++;
1101                         REALLOC_ARRAY(language_tags, num_langs);
1102                         language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1103                         if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1104                                 break;
1105                 }
1106         } while (*s++);
1107
1108         /* write Accept-Language header into buf */
1109         if (num_langs) {
1110                 int last_buf_len = 0;
1111                 int max_q;
1112                 int decimal_places;
1113                 char q_format[32];
1114
1115                 /* add '*' */
1116                 REALLOC_ARRAY(language_tags, num_langs + 1);
1117                 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1118
1119                 /* compute decimal_places */
1120                 for (max_q = 1, decimal_places = 0;
1121                      max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1122                      decimal_places++, max_q *= 10)
1123                         ;
1124
1125                 sprintf(q_format, ";q=0.%%0%dd", decimal_places);
1126
1127                 strbuf_addstr(buf, "Accept-Language: ");
1128
1129                 for (i = 0; i < num_langs; i++) {
1130                         if (i > 0)
1131                                 strbuf_addstr(buf, ", ");
1132
1133                         strbuf_addstr(buf, language_tags[i]);
1134
1135                         if (i > 0)
1136                                 strbuf_addf(buf, q_format, max_q - i);
1137
1138                         if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1139                                 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1140                                 break;
1141                         }
1142
1143                         last_buf_len = buf->len;
1144                 }
1145         }
1146
1147         /* free language tags -- last one is a static '*' */
1148         for (i = 0; i < num_langs - 1; i++)
1149                 free(language_tags[i]);
1150         free(language_tags);
1151 }
1152
1153 /*
1154  * Get an Accept-Language header which indicates user's preferred languages.
1155  *
1156  * Examples:
1157  *   LANGUAGE= -> ""
1158  *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1159  *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1160  *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1161  *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1162  *   LANGUAGE= LANG=C -> ""
1163  */
1164 static const char *get_accept_language(void)
1165 {
1166         if (!cached_accept_language) {
1167                 struct strbuf buf = STRBUF_INIT;
1168                 write_accept_language(&buf);
1169                 if (buf.len > 0)
1170                         cached_accept_language = strbuf_detach(&buf, NULL);
1171         }
1172
1173         return cached_accept_language;
1174 }
1175
1176 /* http_request() targets */
1177 #define HTTP_REQUEST_STRBUF     0
1178 #define HTTP_REQUEST_FILE       1
1179
1180 static int http_request(const char *url,
1181                         void *result, int target,
1182                         const struct http_get_options *options)
1183 {
1184         struct active_request_slot *slot;
1185         struct slot_results results;
1186         struct curl_slist *headers = NULL;
1187         struct strbuf buf = STRBUF_INIT;
1188         const char *accept_language;
1189         int ret;
1190
1191         slot = get_active_slot();
1192         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1193
1194         if (result == NULL) {
1195                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1196         } else {
1197                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1198                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1199
1200                 if (target == HTTP_REQUEST_FILE) {
1201                         long posn = ftell(result);
1202                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1203                                          fwrite);
1204                         if (posn > 0) {
1205                                 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1206                                 headers = curl_slist_append(headers, buf.buf);
1207                                 strbuf_reset(&buf);
1208                         }
1209                 } else
1210                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1211                                          fwrite_buffer);
1212         }
1213
1214         accept_language = get_accept_language();
1215
1216         if (accept_language)
1217                 headers = curl_slist_append(headers, accept_language);
1218
1219         strbuf_addstr(&buf, "Pragma:");
1220         if (options && options->no_cache)
1221                 strbuf_addstr(&buf, " no-cache");
1222         if (options && options->keep_error)
1223                 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1224
1225         headers = curl_slist_append(headers, buf.buf);
1226
1227         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1228         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1229         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1230
1231         ret = run_one_slot(slot, &results);
1232
1233         if (options && options->content_type) {
1234                 struct strbuf raw = STRBUF_INIT;
1235                 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1236                 extract_content_type(&raw, options->content_type,
1237                                      options->charset);
1238                 strbuf_release(&raw);
1239         }
1240
1241         if (options && options->effective_url)
1242                 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1243                                 options->effective_url);
1244
1245         curl_slist_free_all(headers);
1246         strbuf_release(&buf);
1247
1248         return ret;
1249 }
1250
1251 /*
1252  * Update the "base" url to a more appropriate value, as deduced by
1253  * redirects seen when requesting a URL starting with "url".
1254  *
1255  * The "asked" parameter is a URL that we asked curl to access, and must begin
1256  * with "base".
1257  *
1258  * The "got" parameter is the URL that curl reported to us as where we ended
1259  * up.
1260  *
1261  * Returns 1 if we updated the base url, 0 otherwise.
1262  *
1263  * Our basic strategy is to compare "base" and "asked" to find the bits
1264  * specific to our request. We then strip those bits off of "got" to yield the
1265  * new base. So for example, if our base is "http://example.com/foo.git",
1266  * and we ask for "http://example.com/foo.git/info/refs", we might end up
1267  * with "https://other.example.com/foo.git/info/refs". We would want the
1268  * new URL to become "https://other.example.com/foo.git".
1269  *
1270  * Note that this assumes a sane redirect scheme. It's entirely possible
1271  * in the example above to end up at a URL that does not even end in
1272  * "info/refs".  In such a case we simply punt, as there is not much we can
1273  * do (and such a scheme is unlikely to represent a real git repository,
1274  * which means we are likely about to abort anyway).
1275  */
1276 static int update_url_from_redirect(struct strbuf *base,
1277                                     const char *asked,
1278                                     const struct strbuf *got)
1279 {
1280         const char *tail;
1281         size_t tail_len;
1282
1283         if (!strcmp(asked, got->buf))
1284                 return 0;
1285
1286         if (!skip_prefix(asked, base->buf, &tail))
1287                 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1288                     asked, base->buf);
1289
1290         tail_len = strlen(tail);
1291
1292         if (got->len < tail_len ||
1293             strcmp(tail, got->buf + got->len - tail_len))
1294                 return 0; /* insane redirect scheme */
1295
1296         strbuf_reset(base);
1297         strbuf_add(base, got->buf, got->len - tail_len);
1298         return 1;
1299 }
1300
1301 static int http_request_reauth(const char *url,
1302                                void *result, int target,
1303                                struct http_get_options *options)
1304 {
1305         int ret = http_request(url, result, target, options);
1306
1307         if (options && options->effective_url && options->base_url) {
1308                 if (update_url_from_redirect(options->base_url,
1309                                              url, options->effective_url)) {
1310                         credential_from_url(&http_auth, options->base_url->buf);
1311                         url = options->effective_url->buf;
1312                 }
1313         }
1314
1315         if (ret != HTTP_REAUTH)
1316                 return ret;
1317
1318         /*
1319          * If we are using KEEP_ERROR, the previous request may have
1320          * put cruft into our output stream; we should clear it out before
1321          * making our next request. We only know how to do this for
1322          * the strbuf case, but that is enough to satisfy current callers.
1323          */
1324         if (options && options->keep_error) {
1325                 switch (target) {
1326                 case HTTP_REQUEST_STRBUF:
1327                         strbuf_reset(result);
1328                         break;
1329                 default:
1330                         die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1331                 }
1332         }
1333
1334         credential_fill(&http_auth);
1335
1336         return http_request(url, result, target, options);
1337 }
1338
1339 int http_get_strbuf(const char *url,
1340                     struct strbuf *result,
1341                     struct http_get_options *options)
1342 {
1343         return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1344 }
1345
1346 /*
1347  * Downloads a URL and stores the result in the given file.
1348  *
1349  * If a previous interrupted download is detected (i.e. a previous temporary
1350  * file is still around) the download is resumed.
1351  */
1352 static int http_get_file(const char *url, const char *filename,
1353                          struct http_get_options *options)
1354 {
1355         int ret;
1356         struct strbuf tmpfile = STRBUF_INIT;
1357         FILE *result;
1358
1359         strbuf_addf(&tmpfile, "%s.temp", filename);
1360         result = fopen(tmpfile.buf, "a");
1361         if (!result) {
1362                 error("Unable to open local file %s", tmpfile.buf);
1363                 ret = HTTP_ERROR;
1364                 goto cleanup;
1365         }
1366
1367         ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1368         fclose(result);
1369
1370         if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1371                 ret = HTTP_ERROR;
1372 cleanup:
1373         strbuf_release(&tmpfile);
1374         return ret;
1375 }
1376
1377 int http_fetch_ref(const char *base, struct ref *ref)
1378 {
1379         struct http_get_options options = {0};
1380         char *url;
1381         struct strbuf buffer = STRBUF_INIT;
1382         int ret = -1;
1383
1384         options.no_cache = 1;
1385
1386         url = quote_ref_url(base, ref->name);
1387         if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1388                 strbuf_rtrim(&buffer);
1389                 if (buffer.len == 40)
1390                         ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1391                 else if (starts_with(buffer.buf, "ref: ")) {
1392                         ref->symref = xstrdup(buffer.buf + 5);
1393                         ret = 0;
1394                 }
1395         }
1396
1397         strbuf_release(&buffer);
1398         free(url);
1399         return ret;
1400 }
1401
1402 /* Helpers for fetching packs */
1403 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1404 {
1405         char *url, *tmp;
1406         struct strbuf buf = STRBUF_INIT;
1407
1408         if (http_is_verbose)
1409                 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1410
1411         end_url_with_slash(&buf, base_url);
1412         strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1413         url = strbuf_detach(&buf, NULL);
1414
1415         strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1416         tmp = strbuf_detach(&buf, NULL);
1417
1418         if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1419                 error("Unable to get pack index %s", url);
1420                 free(tmp);
1421                 tmp = NULL;
1422         }
1423
1424         free(url);
1425         return tmp;
1426 }
1427
1428 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1429         unsigned char *sha1, const char *base_url)
1430 {
1431         struct packed_git *new_pack;
1432         char *tmp_idx = NULL;
1433         int ret;
1434
1435         if (has_pack_index(sha1)) {
1436                 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1437                 if (!new_pack)
1438                         return -1; /* parse_pack_index() already issued error message */
1439                 goto add_pack;
1440         }
1441
1442         tmp_idx = fetch_pack_index(sha1, base_url);
1443         if (!tmp_idx)
1444                 return -1;
1445
1446         new_pack = parse_pack_index(sha1, tmp_idx);
1447         if (!new_pack) {
1448                 unlink(tmp_idx);
1449                 free(tmp_idx);
1450
1451                 return -1; /* parse_pack_index() already issued error message */
1452         }
1453
1454         ret = verify_pack_index(new_pack);
1455         if (!ret) {
1456                 close_pack_index(new_pack);
1457                 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1458         }
1459         free(tmp_idx);
1460         if (ret)
1461                 return -1;
1462
1463 add_pack:
1464         new_pack->next = *packs_head;
1465         *packs_head = new_pack;
1466         return 0;
1467 }
1468
1469 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1470 {
1471         struct http_get_options options = {0};
1472         int ret = 0, i = 0;
1473         char *url, *data;
1474         struct strbuf buf = STRBUF_INIT;
1475         unsigned char sha1[20];
1476
1477         end_url_with_slash(&buf, base_url);
1478         strbuf_addstr(&buf, "objects/info/packs");
1479         url = strbuf_detach(&buf, NULL);
1480
1481         options.no_cache = 1;
1482         ret = http_get_strbuf(url, &buf, &options);
1483         if (ret != HTTP_OK)
1484                 goto cleanup;
1485
1486         data = buf.buf;
1487         while (i < buf.len) {
1488                 switch (data[i]) {
1489                 case 'P':
1490                         i++;
1491                         if (i + 52 <= buf.len &&
1492                             starts_with(data + i, " pack-") &&
1493                             starts_with(data + i + 46, ".pack\n")) {
1494                                 get_sha1_hex(data + i + 6, sha1);
1495                                 fetch_and_setup_pack_index(packs_head, sha1,
1496                                                       base_url);
1497                                 i += 51;
1498                                 break;
1499                         }
1500                 default:
1501                         while (i < buf.len && data[i] != '\n')
1502                                 i++;
1503                 }
1504                 i++;
1505         }
1506
1507 cleanup:
1508         free(url);
1509         return ret;
1510 }
1511
1512 void release_http_pack_request(struct http_pack_request *preq)
1513 {
1514         if (preq->packfile != NULL) {
1515                 fclose(preq->packfile);
1516                 preq->packfile = NULL;
1517         }
1518         if (preq->range_header != NULL) {
1519                 curl_slist_free_all(preq->range_header);
1520                 preq->range_header = NULL;
1521         }
1522         preq->slot = NULL;
1523         free(preq->url);
1524         free(preq);
1525 }
1526
1527 int finish_http_pack_request(struct http_pack_request *preq)
1528 {
1529         struct packed_git **lst;
1530         struct packed_git *p = preq->target;
1531         char *tmp_idx;
1532         struct child_process ip = CHILD_PROCESS_INIT;
1533         const char *ip_argv[8];
1534
1535         close_pack_index(p);
1536
1537         fclose(preq->packfile);
1538         preq->packfile = NULL;
1539
1540         lst = preq->lst;
1541         while (*lst != p)
1542                 lst = &((*lst)->next);
1543         *lst = (*lst)->next;
1544
1545         tmp_idx = xstrdup(preq->tmpfile);
1546         strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1547                ".idx.temp");
1548
1549         ip_argv[0] = "index-pack";
1550         ip_argv[1] = "-o";
1551         ip_argv[2] = tmp_idx;
1552         ip_argv[3] = preq->tmpfile;
1553         ip_argv[4] = NULL;
1554
1555         ip.argv = ip_argv;
1556         ip.git_cmd = 1;
1557         ip.no_stdin = 1;
1558         ip.no_stdout = 1;
1559
1560         if (run_command(&ip)) {
1561                 unlink(preq->tmpfile);
1562                 unlink(tmp_idx);
1563                 free(tmp_idx);
1564                 return -1;
1565         }
1566
1567         unlink(sha1_pack_index_name(p->sha1));
1568
1569         if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1570          || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1571                 free(tmp_idx);
1572                 return -1;
1573         }
1574
1575         install_packed_git(p);
1576         free(tmp_idx);
1577         return 0;
1578 }
1579
1580 struct http_pack_request *new_http_pack_request(
1581         struct packed_git *target, const char *base_url)
1582 {
1583         long prev_posn = 0;
1584         char range[RANGE_HEADER_SIZE];
1585         struct strbuf buf = STRBUF_INIT;
1586         struct http_pack_request *preq;
1587
1588         preq = xcalloc(1, sizeof(*preq));
1589         preq->target = target;
1590
1591         end_url_with_slash(&buf, base_url);
1592         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1593                 sha1_to_hex(target->sha1));
1594         preq->url = strbuf_detach(&buf, NULL);
1595
1596         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1597                 sha1_pack_name(target->sha1));
1598         preq->packfile = fopen(preq->tmpfile, "a");
1599         if (!preq->packfile) {
1600                 error("Unable to open local file %s for pack",
1601                       preq->tmpfile);
1602                 goto abort;
1603         }
1604
1605         preq->slot = get_active_slot();
1606         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1607         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1608         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1609         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1610                 no_pragma_header);
1611
1612         /*
1613          * If there is data present from a previous transfer attempt,
1614          * resume where it left off
1615          */
1616         prev_posn = ftell(preq->packfile);
1617         if (prev_posn>0) {
1618                 if (http_is_verbose)
1619                         fprintf(stderr,
1620                                 "Resuming fetch of pack %s at byte %ld\n",
1621                                 sha1_to_hex(target->sha1), prev_posn);
1622                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1623                 preq->range_header = curl_slist_append(NULL, range);
1624                 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1625                         preq->range_header);
1626         }
1627
1628         return preq;
1629
1630 abort:
1631         free(preq->url);
1632         free(preq);
1633         return NULL;
1634 }
1635
1636 /* Helpers for fetching objects (loose) */
1637 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1638                                void *data)
1639 {
1640         unsigned char expn[4096];
1641         size_t size = eltsize * nmemb;
1642         int posn = 0;
1643         struct http_object_request *freq =
1644                 (struct http_object_request *)data;
1645         do {
1646                 ssize_t retval = xwrite(freq->localfile,
1647                                         (char *) ptr + posn, size - posn);
1648                 if (retval < 0)
1649                         return posn;
1650                 posn += retval;
1651         } while (posn < size);
1652
1653         freq->stream.avail_in = size;
1654         freq->stream.next_in = (void *)ptr;
1655         do {
1656                 freq->stream.next_out = expn;
1657                 freq->stream.avail_out = sizeof(expn);
1658                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1659                 git_SHA1_Update(&freq->c, expn,
1660                                 sizeof(expn) - freq->stream.avail_out);
1661         } while (freq->stream.avail_in && freq->zret == Z_OK);
1662         return size;
1663 }
1664
1665 struct http_object_request *new_http_object_request(const char *base_url,
1666         unsigned char *sha1)
1667 {
1668         char *hex = sha1_to_hex(sha1);
1669         const char *filename;
1670         char prevfile[PATH_MAX];
1671         int prevlocal;
1672         char prev_buf[PREV_BUF_SIZE];
1673         ssize_t prev_read = 0;
1674         long prev_posn = 0;
1675         char range[RANGE_HEADER_SIZE];
1676         struct curl_slist *range_header = NULL;
1677         struct http_object_request *freq;
1678
1679         freq = xcalloc(1, sizeof(*freq));
1680         hashcpy(freq->sha1, sha1);
1681         freq->localfile = -1;
1682
1683         filename = sha1_file_name(sha1);
1684         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1685                  "%s.temp", filename);
1686
1687         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1688         unlink_or_warn(prevfile);
1689         rename(freq->tmpfile, prevfile);
1690         unlink_or_warn(freq->tmpfile);
1691
1692         if (freq->localfile != -1)
1693                 error("fd leakage in start: %d", freq->localfile);
1694         freq->localfile = open(freq->tmpfile,
1695                                O_WRONLY | O_CREAT | O_EXCL, 0666);
1696         /*
1697          * This could have failed due to the "lazy directory creation";
1698          * try to mkdir the last path component.
1699          */
1700         if (freq->localfile < 0 && errno == ENOENT) {
1701                 char *dir = strrchr(freq->tmpfile, '/');
1702                 if (dir) {
1703                         *dir = 0;
1704                         mkdir(freq->tmpfile, 0777);
1705                         *dir = '/';
1706                 }
1707                 freq->localfile = open(freq->tmpfile,
1708                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
1709         }
1710
1711         if (freq->localfile < 0) {
1712                 error("Couldn't create temporary file %s: %s",
1713                       freq->tmpfile, strerror(errno));
1714                 goto abort;
1715         }
1716
1717         git_inflate_init(&freq->stream);
1718
1719         git_SHA1_Init(&freq->c);
1720
1721         freq->url = get_remote_object_url(base_url, hex, 0);
1722
1723         /*
1724          * If a previous temp file is present, process what was already
1725          * fetched.
1726          */
1727         prevlocal = open(prevfile, O_RDONLY);
1728         if (prevlocal != -1) {
1729                 do {
1730                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1731                         if (prev_read>0) {
1732                                 if (fwrite_sha1_file(prev_buf,
1733                                                      1,
1734                                                      prev_read,
1735                                                      freq) == prev_read) {
1736                                         prev_posn += prev_read;
1737                                 } else {
1738                                         prev_read = -1;
1739                                 }
1740                         }
1741                 } while (prev_read > 0);
1742                 close(prevlocal);
1743         }
1744         unlink_or_warn(prevfile);
1745
1746         /*
1747          * Reset inflate/SHA1 if there was an error reading the previous temp
1748          * file; also rewind to the beginning of the local file.
1749          */
1750         if (prev_read == -1) {
1751                 memset(&freq->stream, 0, sizeof(freq->stream));
1752                 git_inflate_init(&freq->stream);
1753                 git_SHA1_Init(&freq->c);
1754                 if (prev_posn>0) {
1755                         prev_posn = 0;
1756                         lseek(freq->localfile, 0, SEEK_SET);
1757                         if (ftruncate(freq->localfile, 0) < 0) {
1758                                 error("Couldn't truncate temporary file %s: %s",
1759                                           freq->tmpfile, strerror(errno));
1760                                 goto abort;
1761                         }
1762                 }
1763         }
1764
1765         freq->slot = get_active_slot();
1766
1767         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1768         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1769         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1770         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1771         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1772
1773         /*
1774          * If we have successfully processed data from a previous fetch
1775          * attempt, only fetch the data we don't already have.
1776          */
1777         if (prev_posn>0) {
1778                 if (http_is_verbose)
1779                         fprintf(stderr,
1780                                 "Resuming fetch of object %s at byte %ld\n",
1781                                 hex, prev_posn);
1782                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1783                 range_header = curl_slist_append(range_header, range);
1784                 curl_easy_setopt(freq->slot->curl,
1785                                  CURLOPT_HTTPHEADER, range_header);
1786         }
1787
1788         return freq;
1789
1790 abort:
1791         free(freq->url);
1792         free(freq);
1793         return NULL;
1794 }
1795
1796 void process_http_object_request(struct http_object_request *freq)
1797 {
1798         if (freq->slot == NULL)
1799                 return;
1800         freq->curl_result = freq->slot->curl_result;
1801         freq->http_code = freq->slot->http_code;
1802         freq->slot = NULL;
1803 }
1804
1805 int finish_http_object_request(struct http_object_request *freq)
1806 {
1807         struct stat st;
1808
1809         close(freq->localfile);
1810         freq->localfile = -1;
1811
1812         process_http_object_request(freq);
1813
1814         if (freq->http_code == 416) {
1815                 warning("requested range invalid; we may already have all the data.");
1816         } else if (freq->curl_result != CURLE_OK) {
1817                 if (stat(freq->tmpfile, &st) == 0)
1818                         if (st.st_size == 0)
1819                                 unlink_or_warn(freq->tmpfile);
1820                 return -1;
1821         }
1822
1823         git_inflate_end(&freq->stream);
1824         git_SHA1_Final(freq->real_sha1, &freq->c);
1825         if (freq->zret != Z_STREAM_END) {
1826                 unlink_or_warn(freq->tmpfile);
1827                 return -1;
1828         }
1829         if (hashcmp(freq->sha1, freq->real_sha1)) {
1830                 unlink_or_warn(freq->tmpfile);
1831                 return -1;
1832         }
1833         freq->rename =
1834                 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
1835
1836         return freq->rename;
1837 }
1838
1839 void abort_http_object_request(struct http_object_request *freq)
1840 {
1841         unlink_or_warn(freq->tmpfile);
1842
1843         release_http_object_request(freq);
1844 }
1845
1846 void release_http_object_request(struct http_object_request *freq)
1847 {
1848         if (freq->localfile != -1) {
1849                 close(freq->localfile);
1850                 freq->localfile = -1;
1851         }
1852         if (freq->url != NULL) {
1853                 free(freq->url);
1854                 freq->url = NULL;
1855         }
1856         if (freq->slot != NULL) {
1857                 freq->slot->callback_func = NULL;
1858                 freq->slot->callback_data = NULL;
1859                 release_active_slot(freq->slot);
1860                 freq->slot = NULL;
1861         }
1862 }