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