http.c

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