git.oblomov.eu Git - git/blob - http.c

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