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