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         if (ssl_cert != NULL)
 283                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 284         if (has_cert_password())
 285                 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
 286 #if LIBCURL_VERSION_NUM >= 0x070903
 287         if (ssl_key != NULL)
 288                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 289 #endif
 290 #if LIBCURL_VERSION_NUM >= 0x070908
 291         if (ssl_capath != NULL)
 292                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 293 #endif
 294         if (ssl_cainfo != NULL)
 295                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 296         curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 297
 298         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 299                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 300                                  curl_low_speed_limit);
 301                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 302                                  curl_low_speed_time);
 303         }
 304
 305         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 306 #if LIBCURL_VERSION_NUM >= 0x071301
 307         curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 308 #elif LIBCURL_VERSION_NUM >= 0x071101
 309         curl_easy_setopt(result, CURLOPT_POST301, 1);
 310 #endif
 311
 312         if (getenv("GIT_CURL_VERBOSE"))
 313                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 314
 315         curl_easy_setopt(result, CURLOPT_USERAGENT,
 316                 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
 317
 318         if (curl_ftp_no_epsv)
 319                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 320
 321         if (curl_http_proxy)
 322                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 323
 324         return result;
 325 }
 326
 327 static void http_auth_init(const char *url)
 328 {
 329         const char *at, *colon, *cp, *slash, *host;
 330
 331         cp = strstr(url, "://");
 332         if (!cp)
 333                 return;
 334
 335         /*
 336          * Ok, the URL looks like "proto://something".  Which one?
 337          * "proto://<user>:<pass>@<host>/...",
 338          * "proto://<user>@<host>/...", or just
 339          * "proto://<host>/..."?
 340          */
 341         cp += 3;
 342         at = strchr(cp, '@');
 343         colon = strchr(cp, ':');
 344         slash = strchrnul(cp, '/');
 345         if (!at || slash <= at) {
 346                 /* No credentials, but we may have to ask for some later */
 347                 host = cp;
 348         }
 349         else if (!colon || at <= colon) {
 350                 /* Only username */
 351                 user_name = url_decode_mem(cp, at - cp);
 352                 user_pass = NULL;
 353                 host = at + 1;
 354         } else {
 355                 user_name = url_decode_mem(cp, colon - cp);
 356                 user_pass = url_decode_mem(colon + 1, at - (colon + 1));
 357                 host = at + 1;
 358         }
 359
 360         description = url_decode_mem(host, slash - host);
 361 }
 362
 363 static void set_from_env(const char **var, const char *envname)
 364 {
 365         const char *val = getenv(envname);
 366         if (val)
 367                 *var = val;
 368 }
 369
 370 void http_init(struct remote *remote, const char *url)
 371 {
 372         char *low_speed_limit;
 373         char *low_speed_time;
 374
 375         http_is_verbose = 0;
 376
 377         git_config(http_options, NULL);
 378
 379         curl_global_init(CURL_GLOBAL_ALL);
 380
 381         if (remote && remote->http_proxy)
 382                 curl_http_proxy = xstrdup(remote->http_proxy);
 383
 384         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 385         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 386
 387 #ifdef USE_CURL_MULTI
 388         {
 389                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 390                 if (http_max_requests != NULL)
 391                         max_requests = atoi(http_max_requests);
 392         }
 393
 394         curlm = curl_multi_init();
 395         if (curlm == NULL) {
 396                 fprintf(stderr, "Error creating curl multi handle.\n");
 397                 exit(1);
 398         }
 399 #endif
 400
 401         if (getenv("GIT_SSL_NO_VERIFY"))
 402                 curl_ssl_verify = 0;
 403
 404         set_from_env(&ssl_cert, "GIT_SSL_CERT");
 405 #if LIBCURL_VERSION_NUM >= 0x070903
 406         set_from_env(&ssl_key, "GIT_SSL_KEY");
 407 #endif
 408 #if LIBCURL_VERSION_NUM >= 0x070908
 409         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 410 #endif
 411         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 412
 413         set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 414
 415         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 416         if (low_speed_limit != NULL)
 417                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 418         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 419         if (low_speed_time != NULL)
 420                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 421
 422         if (curl_ssl_verify == -1)
 423                 curl_ssl_verify = 1;
 424
 425         curl_session_count = 0;
 426 #ifdef USE_CURL_MULTI
 427         if (max_requests < 1)
 428                 max_requests = DEFAULT_MAX_REQUESTS;
 429 #endif
 430
 431         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 432                 curl_ftp_no_epsv = 1;
 433
 434         if (url) {
 435                 http_auth_init(url);
 436                 if (!ssl_cert_password_required &&
 437                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 438                     !prefixcmp(url, "https://"))
 439                         ssl_cert_password_required = 1;
 440         }
 441
 442 #ifndef NO_CURL_EASY_DUPHANDLE
 443         curl_default = get_curl_handle();
 444 #endif
 445 }
 446
 447 void http_cleanup(void)
 448 {
 449         struct active_request_slot *slot = active_queue_head;
 450
 451         while (slot != NULL) {
 452                 struct active_request_slot *next = slot->next;
 453                 if (slot->curl != NULL) {
 454 #ifdef USE_CURL_MULTI
 455                         curl_multi_remove_handle(curlm, slot->curl);
 456 #endif
 457                         curl_easy_cleanup(slot->curl);
 458                 }
 459                 free(slot);
 460                 slot = next;
 461         }
 462         active_queue_head = NULL;
 463
 464 #ifndef NO_CURL_EASY_DUPHANDLE
 465         curl_easy_cleanup(curl_default);
 466 #endif
 467
 468 #ifdef USE_CURL_MULTI
 469         curl_multi_cleanup(curlm);
 470 #endif
 471         curl_global_cleanup();
 472
 473         curl_slist_free_all(pragma_header);
 474         pragma_header = NULL;
 475
 476         curl_slist_free_all(no_pragma_header);
 477         no_pragma_header = NULL;
 478
 479         if (curl_http_proxy) {
 480                 free((void *)curl_http_proxy);
 481                 curl_http_proxy = NULL;
 482         }
 483
 484         if (ssl_cert_password != NULL) {
 485                 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
 486                 free(ssl_cert_password);
 487                 ssl_cert_password = NULL;
 488         }
 489         ssl_cert_password_required = 0;
 490 }
 491
 492 struct active_request_slot *get_active_slot(void)
 493 {
 494         struct active_request_slot *slot = active_queue_head;
 495         struct active_request_slot *newslot;
 496
 497 #ifdef USE_CURL_MULTI
 498         int num_transfers;
 499
 500         /* Wait for a slot to open up if the queue is full */
 501         while (active_requests >= max_requests) {
 502                 curl_multi_perform(curlm, &num_transfers);
 503                 if (num_transfers < active_requests)
 504                         process_curl_messages();
 505         }
 506 #endif
 507
 508         while (slot != NULL && slot->in_use)
 509                 slot = slot->next;
 510
 511         if (slot == NULL) {
 512                 newslot = xmalloc(sizeof(*newslot));
 513                 newslot->curl = NULL;
 514                 newslot->in_use = 0;
 515                 newslot->next = NULL;
 516
 517                 slot = active_queue_head;
 518                 if (slot == NULL) {
 519                         active_queue_head = newslot;
 520                 } else {
 521                         while (slot->next != NULL)
 522                                 slot = slot->next;
 523                         slot->next = newslot;
 524                 }
 525                 slot = newslot;
 526         }
 527
 528         if (slot->curl == NULL) {
 529 #ifdef NO_CURL_EASY_DUPHANDLE
 530                 slot->curl = get_curl_handle();
 531 #else
 532                 slot->curl = curl_easy_duphandle(curl_default);
 533 #endif
 534                 curl_session_count++;
 535         }
 536
 537         active_requests++;
 538         slot->in_use = 1;
 539         slot->local = NULL;
 540         slot->results = NULL;
 541         slot->finished = NULL;
 542         slot->callback_data = NULL;
 543         slot->callback_func = NULL;
 544         curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 545         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 546         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 547         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 548         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 549         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 550         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 551         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 552         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 553
 554         return slot;
 555 }
 556
 557 int start_active_slot(struct active_request_slot *slot)
 558 {
 559 #ifdef USE_CURL_MULTI
 560         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 561         int num_transfers;
 562
 563         if (curlm_result != CURLM_OK &&
 564             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 565                 active_requests--;
 566                 slot->in_use = 0;
 567                 return 0;
 568         }
 569
 570         /*
 571          * We know there must be something to do, since we just added
 572          * something.
 573          */
 574         curl_multi_perform(curlm, &num_transfers);
 575 #endif
 576         return 1;
 577 }
 578
 579 #ifdef USE_CURL_MULTI
 580 struct fill_chain {
 581         void *data;
 582         int (*fill)(void *);
 583         struct fill_chain *next;
 584 };
 585
 586 static struct fill_chain *fill_cfg;
 587
 588 void add_fill_function(void *data, int (*fill)(void *))
 589 {
 590         struct fill_chain *new = xmalloc(sizeof(*new));
 591         struct fill_chain **linkp = &fill_cfg;
 592         new->data = data;
 593         new->fill = fill;
 594         new->next = NULL;
 595         while (*linkp)
 596                 linkp = &(*linkp)->next;
 597         *linkp = new;
 598 }
 599
 600 void fill_active_slots(void)
 601 {
 602         struct active_request_slot *slot = active_queue_head;
 603
 604         while (active_requests < max_requests) {
 605                 struct fill_chain *fill;
 606                 for (fill = fill_cfg; fill; fill = fill->next)
 607                         if (fill->fill(fill->data))
 608                                 break;
 609
 610                 if (!fill)
 611                         break;
 612         }
 613
 614         while (slot != NULL) {
 615                 if (!slot->in_use && slot->curl != NULL
 616                         && curl_session_count > min_curl_sessions) {
 617                         curl_easy_cleanup(slot->curl);
 618                         slot->curl = NULL;
 619                         curl_session_count--;
 620                 }
 621                 slot = slot->next;
 622         }
 623 }
 624
 625 void step_active_slots(void)
 626 {
 627         int num_transfers;
 628         CURLMcode curlm_result;
 629
 630         do {
 631                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 632         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 633         if (num_transfers < active_requests) {
 634                 process_curl_messages();
 635                 fill_active_slots();
 636         }
 637 }
 638 #endif
 639
 640 void run_active_slot(struct active_request_slot *slot)
 641 {
 642 #ifdef USE_CURL_MULTI
 643         long last_pos = 0;
 644         long current_pos;
 645         fd_set readfds;
 646         fd_set writefds;
 647         fd_set excfds;
 648         int max_fd;
 649         struct timeval select_timeout;
 650         int finished = 0;
 651
 652         slot->finished = &finished;
 653         while (!finished) {
 654                 data_received = 0;
 655                 step_active_slots();
 656
 657                 if (!data_received && slot->local != NULL) {
 658                         current_pos = ftell(slot->local);
 659                         if (current_pos > last_pos)
 660                                 data_received++;
 661                         last_pos = current_pos;
 662                 }
 663
 664                 if (slot->in_use && !data_received) {
 665                         max_fd = 0;
 666                         FD_ZERO(&readfds);
 667                         FD_ZERO(&writefds);
 668                         FD_ZERO(&excfds);
 669                         select_timeout.tv_sec = 0;
 670                         select_timeout.tv_usec = 50000;
 671                         select(max_fd, &readfds, &writefds,
 672                                &excfds, &select_timeout);
 673                 }
 674         }
 675 #else
 676         while (slot->in_use) {
 677                 slot->curl_result = curl_easy_perform(slot->curl);
 678                 finish_active_slot(slot);
 679         }
 680 #endif
 681 }
 682
 683 static void closedown_active_slot(struct active_request_slot *slot)
 684 {
 685         active_requests--;
 686         slot->in_use = 0;
 687 }
 688
 689 static void release_active_slot(struct active_request_slot *slot)
 690 {
 691         closedown_active_slot(slot);
 692         if (slot->curl && curl_session_count > min_curl_sessions) {
 693 #ifdef USE_CURL_MULTI
 694                 curl_multi_remove_handle(curlm, slot->curl);
 695 #endif
 696                 curl_easy_cleanup(slot->curl);
 697                 slot->curl = NULL;
 698                 curl_session_count--;
 699         }
 700 #ifdef USE_CURL_MULTI
 701         fill_active_slots();
 702 #endif
 703 }
 704
 705 void finish_active_slot(struct active_request_slot *slot)
 706 {
 707         closedown_active_slot(slot);
 708         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 709
 710         if (slot->finished != NULL)
 711                 (*slot->finished) = 1;
 712
 713         /* Store slot results so they can be read after the slot is reused */
 714         if (slot->results != NULL) {
 715                 slot->results->curl_result = slot->curl_result;
 716                 slot->results->http_code = slot->http_code;
 717         }
 718
 719         /* Run callback if appropriate */
 720         if (slot->callback_func != NULL)
 721                 slot->callback_func(slot->callback_data);
 722 }
 723
 724 void finish_all_active_slots(void)
 725 {
 726         struct active_request_slot *slot = active_queue_head;
 727
 728         while (slot != NULL)
 729                 if (slot->in_use) {
 730                         run_active_slot(slot);
 731                         slot = active_queue_head;
 732                 } else {
 733                         slot = slot->next;
 734                 }
 735 }
 736
 737 /* Helpers for modifying and creating URLs */
 738 static inline int needs_quote(int ch)
 739 {
 740         if (((ch >= 'A') && (ch <= 'Z'))
 741                         || ((ch >= 'a') && (ch <= 'z'))
 742                         || ((ch >= '0') && (ch <= '9'))
 743                         || (ch == '/')
 744                         || (ch == '-')
 745                         || (ch == '.'))
 746                 return 0;
 747         return 1;
 748 }
 749
 750 static inline int hex(int v)
 751 {
 752         if (v < 10)
 753                 return '0' + v;
 754         else
 755                 return 'A' + v - 10;
 756 }
 757
 758 static char *quote_ref_url(const char *base, const char *ref)
 759 {
 760         struct strbuf buf = STRBUF_INIT;
 761         const char *cp;
 762         int ch;
 763
 764         end_url_with_slash(&buf, base);
 765
 766         for (cp = ref; (ch = *cp) != 0; cp++)
 767                 if (needs_quote(ch))
 768                         strbuf_addf(&buf, "%%%02x", ch);
 769                 else
 770                         strbuf_addch(&buf, *cp);
 771
 772         return strbuf_detach(&buf, NULL);
 773 }
 774
 775 void append_remote_object_url(struct strbuf *buf, const char *url,
 776                               const char *hex,
 777                               int only_two_digit_prefix)
 778 {
 779         end_url_with_slash(buf, url);
 780
 781         strbuf_addf(buf, "objects/%.*s/", 2, hex);
 782         if (!only_two_digit_prefix)
 783                 strbuf_addf(buf, "%s", hex+2);
 784 }
 785
 786 char *get_remote_object_url(const char *url, const char *hex,
 787                             int only_two_digit_prefix)
 788 {
 789         struct strbuf buf = STRBUF_INIT;
 790         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 791         return strbuf_detach(&buf, NULL);
 792 }
 793
 794 /* http_request() targets */
 795 #define HTTP_REQUEST_STRBUF     0
 796 #define HTTP_REQUEST_FILE       1
 797
 798 static int http_request(const char *url, void *result, int target, int options)
 799 {
 800         struct active_request_slot *slot;
 801         struct slot_results results;
 802         struct curl_slist *headers = NULL;
 803         struct strbuf buf = STRBUF_INIT;
 804         int ret;
 805
 806         slot = get_active_slot();
 807         slot->results = &results;
 808         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 809
 810         if (result == NULL) {
 811                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 812         } else {
 813                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 814                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 815
 816                 if (target == HTTP_REQUEST_FILE) {
 817                         long posn = ftell(result);
 818                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 819                                          fwrite);
 820                         if (posn > 0) {
 821                                 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 822                                 headers = curl_slist_append(headers, buf.buf);
 823                                 strbuf_reset(&buf);
 824                         }
 825                         slot->local = result;
 826                 } else
 827                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 828                                          fwrite_buffer);
 829         }
 830
 831         strbuf_addstr(&buf, "Pragma:");
 832         if (options & HTTP_NO_CACHE)
 833                 strbuf_addstr(&buf, " no-cache");
 834
 835         headers = curl_slist_append(headers, buf.buf);
 836
 837         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 838         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 839
 840         if (start_active_slot(slot)) {
 841                 run_active_slot(slot);
 842                 if (results.curl_result == CURLE_OK)
 843                         ret = HTTP_OK;
 844                 else if (missing_target(&results))
 845                         ret = HTTP_MISSING_TARGET;
 846                 else if (results.http_code == 401) {
 847                         if (user_name && user_pass) {
 848                                 ret = HTTP_NOAUTH;
 849                         } else {
 850                                 /*
 851                                  * git_getpass is needed here because its very likely stdin/stdout are
 852                                  * pipes to our parent process.  So we instead need to use /dev/tty,
 853                                  * but that is non-portable.  Using git_getpass() can at least be stubbed
 854                                  * on other platforms with a different implementation if/when necessary.
 855                                  */
 856                                 if (!user_name)
 857                                         user_name = xstrdup(git_getpass_with_description("Username", description));
 858                                 init_curl_http_auth(slot->curl);
 859                                 ret = HTTP_REAUTH;
 860                         }
 861                 } else {
 862                         if (!curl_errorstr[0])
 863                                 strlcpy(curl_errorstr,
 864                                         curl_easy_strerror(results.curl_result),
 865                                         sizeof(curl_errorstr));
 866                         ret = HTTP_ERROR;
 867                 }
 868         } else {
 869                 error("Unable to start HTTP request for %s", url);
 870                 ret = HTTP_START_FAILED;
 871         }
 872
 873         slot->local = NULL;
 874         curl_slist_free_all(headers);
 875         strbuf_release(&buf);
 876
 877         return ret;
 878 }
 879
 880 static int http_request_reauth(const char *url, void *result, int target,
 881                                int options)
 882 {
 883         int ret = http_request(url, result, target, options);
 884         if (ret != HTTP_REAUTH)
 885                 return ret;
 886         return http_request(url, result, target, options);
 887 }
 888
 889 int http_get_strbuf(const char *url, struct strbuf *result, int options)
 890 {
 891         return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
 892 }
 893
 894 /*
 895  * Downloads an url and stores the result in the given file.
 896  *
 897  * If a previous interrupted download is detected (i.e. a previous temporary
 898  * file is still around) the download is resumed.
 899  */
 900 static int http_get_file(const char *url, const char *filename, int options)
 901 {
 902         int ret;
 903         struct strbuf tmpfile = STRBUF_INIT;
 904         FILE *result;
 905
 906         strbuf_addf(&tmpfile, "%s.temp", filename);
 907         result = fopen(tmpfile.buf, "a");
 908         if (! result) {
 909                 error("Unable to open local file %s", tmpfile.buf);
 910                 ret = HTTP_ERROR;
 911                 goto cleanup;
 912         }
 913
 914         ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
 915         fclose(result);
 916
 917         if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 918                 ret = HTTP_ERROR;
 919 cleanup:
 920         strbuf_release(&tmpfile);
 921         return ret;
 922 }
 923
 924 int http_error(const char *url, int ret)
 925 {
 926         /* http_request has already handled HTTP_START_FAILED. */
 927         if (ret != HTTP_START_FAILED)
 928                 error("%s while accessing %s", curl_errorstr, url);
 929
 930         return ret;
 931 }
 932
 933 int http_fetch_ref(const char *base, struct ref *ref)
 934 {
 935         char *url;
 936         struct strbuf buffer = STRBUF_INIT;
 937         int ret = -1;
 938
 939         url = quote_ref_url(base, ref->name);
 940         if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 941                 strbuf_rtrim(&buffer);
 942                 if (buffer.len == 40)
 943                         ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 944                 else if (!prefixcmp(buffer.buf, "ref: ")) {
 945                         ref->symref = xstrdup(buffer.buf + 5);
 946                         ret = 0;
 947                 }
 948         }
 949
 950         strbuf_release(&buffer);
 951         free(url);
 952         return ret;
 953 }
 954
 955 /* Helpers for fetching packs */
 956 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
 957 {
 958         char *url, *tmp;
 959         struct strbuf buf = STRBUF_INIT;
 960
 961         if (http_is_verbose)
 962                 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
 963
 964         end_url_with_slash(&buf, base_url);
 965         strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
 966         url = strbuf_detach(&buf, NULL);
 967
 968         strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
 969         tmp = strbuf_detach(&buf, NULL);
 970
 971         if (http_get_file(url, tmp, 0) != HTTP_OK) {
 972                 error("Unable to get pack index %s\n", url);
 973                 free(tmp);
 974                 tmp = NULL;
 975         }
 976
 977         free(url);
 978         return tmp;
 979 }
 980
 981 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
 982         unsigned char *sha1, const char *base_url)
 983 {
 984         struct packed_git *new_pack;
 985         char *tmp_idx = NULL;
 986         int ret;
 987
 988         if (has_pack_index(sha1)) {
 989                 new_pack = parse_pack_index(sha1, NULL);
 990                 if (!new_pack)
 991                         return -1; /* parse_pack_index() already issued error message */
 992                 goto add_pack;
 993         }
 994
 995         tmp_idx = fetch_pack_index(sha1, base_url);
 996         if (!tmp_idx)
 997                 return -1;
 998
 999         new_pack = parse_pack_index(sha1, tmp_idx);
1000         if (!new_pack) {
1001                 unlink(tmp_idx);
1002                 free(tmp_idx);
1003
1004                 return -1; /* parse_pack_index() already issued error message */
1005         }
1006
1007         ret = verify_pack_index(new_pack);
1008         if (!ret) {
1009                 close_pack_index(new_pack);
1010                 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1011         }
1012         free(tmp_idx);
1013         if (ret)
1014                 return -1;
1015
1016 add_pack:
1017         new_pack->next = *packs_head;
1018         *packs_head = new_pack;
1019         return 0;
1020 }
1021
1022 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1023 {
1024         int ret = 0, i = 0;
1025         char *url, *data;
1026         struct strbuf buf = STRBUF_INIT;
1027         unsigned char sha1[20];
1028
1029         end_url_with_slash(&buf, base_url);
1030         strbuf_addstr(&buf, "objects/info/packs");
1031         url = strbuf_detach(&buf, NULL);
1032
1033         ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1034         if (ret != HTTP_OK)
1035                 goto cleanup;
1036
1037         data = buf.buf;
1038         while (i < buf.len) {
1039                 switch (data[i]) {
1040                 case 'P':
1041                         i++;
1042                         if (i + 52 <= buf.len &&
1043                             !prefixcmp(data + i, " pack-") &&
1044                             !prefixcmp(data + i + 46, ".pack\n")) {
1045                                 get_sha1_hex(data + i + 6, sha1);
1046                                 fetch_and_setup_pack_index(packs_head, sha1,
1047                                                       base_url);
1048                                 i += 51;
1049                                 break;
1050                         }
1051                 default:
1052                         while (i < buf.len && data[i] != '\n')
1053                                 i++;
1054                 }
1055                 i++;
1056         }
1057
1058 cleanup:
1059         free(url);
1060         return ret;
1061 }
1062
1063 void release_http_pack_request(struct http_pack_request *preq)
1064 {
1065         if (preq->packfile != NULL) {
1066                 fclose(preq->packfile);
1067                 preq->packfile = NULL;
1068                 preq->slot->local = NULL;
1069         }
1070         if (preq->range_header != NULL) {
1071                 curl_slist_free_all(preq->range_header);
1072                 preq->range_header = NULL;
1073         }
1074         preq->slot = NULL;
1075         free(preq->url);
1076 }
1077
1078 int finish_http_pack_request(struct http_pack_request *preq)
1079 {
1080         struct packed_git **lst;
1081         struct packed_git *p = preq->target;
1082         char *tmp_idx;
1083         struct child_process ip;
1084         const char *ip_argv[8];
1085
1086         close_pack_index(p);
1087
1088         fclose(preq->packfile);
1089         preq->packfile = NULL;
1090         preq->slot->local = NULL;
1091
1092         lst = preq->lst;
1093         while (*lst != p)
1094                 lst = &((*lst)->next);
1095         *lst = (*lst)->next;
1096
1097         tmp_idx = xstrdup(preq->tmpfile);
1098         strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1099                ".idx.temp");
1100
1101         ip_argv[0] = "index-pack";
1102         ip_argv[1] = "-o";
1103         ip_argv[2] = tmp_idx;
1104         ip_argv[3] = preq->tmpfile;
1105         ip_argv[4] = NULL;
1106
1107         memset(&ip, 0, sizeof(ip));
1108         ip.argv = ip_argv;
1109         ip.git_cmd = 1;
1110         ip.no_stdin = 1;
1111         ip.no_stdout = 1;
1112
1113         if (run_command(&ip)) {
1114                 unlink(preq->tmpfile);
1115                 unlink(tmp_idx);
1116                 free(tmp_idx);
1117                 return -1;
1118         }
1119
1120         unlink(sha1_pack_index_name(p->sha1));
1121
1122         if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1123          || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1124                 free(tmp_idx);
1125                 return -1;
1126         }
1127
1128         install_packed_git(p);
1129         free(tmp_idx);
1130         return 0;
1131 }
1132
1133 struct http_pack_request *new_http_pack_request(
1134         struct packed_git *target, const char *base_url)
1135 {
1136         long prev_posn = 0;
1137         char range[RANGE_HEADER_SIZE];
1138         struct strbuf buf = STRBUF_INIT;
1139         struct http_pack_request *preq;
1140
1141         preq = xcalloc(1, sizeof(*preq));
1142         preq->target = target;
1143
1144         end_url_with_slash(&buf, base_url);
1145         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1146                 sha1_to_hex(target->sha1));
1147         preq->url = strbuf_detach(&buf, NULL);
1148
1149         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1150                 sha1_pack_name(target->sha1));
1151         preq->packfile = fopen(preq->tmpfile, "a");
1152         if (!preq->packfile) {
1153                 error("Unable to open local file %s for pack",
1154                       preq->tmpfile);
1155                 goto abort;
1156         }
1157
1158         preq->slot = get_active_slot();
1159         preq->slot->local = preq->packfile;
1160         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1161         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1162         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1163         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1164                 no_pragma_header);
1165
1166         /*
1167          * If there is data present from a previous transfer attempt,
1168          * resume where it left off
1169          */
1170         prev_posn = ftell(preq->packfile);
1171         if (prev_posn>0) {
1172                 if (http_is_verbose)
1173                         fprintf(stderr,
1174                                 "Resuming fetch of pack %s at byte %ld\n",
1175                                 sha1_to_hex(target->sha1), prev_posn);
1176                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1177                 preq->range_header = curl_slist_append(NULL, range);
1178                 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1179                         preq->range_header);
1180         }
1181
1182         return preq;
1183
1184 abort:
1185         free(preq->url);
1186         free(preq);
1187         return NULL;
1188 }
1189
1190 /* Helpers for fetching objects (loose) */
1191 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1192                                void *data)
1193 {
1194         unsigned char expn[4096];
1195         size_t size = eltsize * nmemb;
1196         int posn = 0;
1197         struct http_object_request *freq =
1198                 (struct http_object_request *)data;
1199         do {
1200                 ssize_t retval = xwrite(freq->localfile,
1201                                         (char *) ptr + posn, size - posn);
1202                 if (retval < 0)
1203                         return posn;
1204                 posn += retval;
1205         } while (posn < size);
1206
1207         freq->stream.avail_in = size;
1208         freq->stream.next_in = (void *)ptr;
1209         do {
1210                 freq->stream.next_out = expn;
1211                 freq->stream.avail_out = sizeof(expn);
1212                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1213                 git_SHA1_Update(&freq->c, expn,
1214                                 sizeof(expn) - freq->stream.avail_out);
1215         } while (freq->stream.avail_in && freq->zret == Z_OK);
1216         data_received++;
1217         return size;
1218 }
1219
1220 struct http_object_request *new_http_object_request(const char *base_url,
1221         unsigned char *sha1)
1222 {
1223         char *hex = sha1_to_hex(sha1);
1224         char *filename;
1225         char prevfile[PATH_MAX];
1226         int prevlocal;
1227         char prev_buf[PREV_BUF_SIZE];
1228         ssize_t prev_read = 0;
1229         long prev_posn = 0;
1230         char range[RANGE_HEADER_SIZE];
1231         struct curl_slist *range_header = NULL;
1232         struct http_object_request *freq;
1233
1234         freq = xcalloc(1, sizeof(*freq));
1235         hashcpy(freq->sha1, sha1);
1236         freq->localfile = -1;
1237
1238         filename = sha1_file_name(sha1);
1239         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1240                  "%s.temp", filename);
1241
1242         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1243         unlink_or_warn(prevfile);
1244         rename(freq->tmpfile, prevfile);
1245         unlink_or_warn(freq->tmpfile);
1246
1247         if (freq->localfile != -1)
1248                 error("fd leakage in start: %d", freq->localfile);
1249         freq->localfile = open(freq->tmpfile,
1250                                O_WRONLY | O_CREAT | O_EXCL, 0666);
1251         /*
1252          * This could have failed due to the "lazy directory creation";
1253          * try to mkdir the last path component.
1254          */
1255         if (freq->localfile < 0 && errno == ENOENT) {
1256                 char *dir = strrchr(freq->tmpfile, '/');
1257                 if (dir) {
1258                         *dir = 0;
1259                         mkdir(freq->tmpfile, 0777);
1260                         *dir = '/';
1261                 }
1262                 freq->localfile = open(freq->tmpfile,
1263                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
1264         }
1265
1266         if (freq->localfile < 0) {
1267                 error("Couldn't create temporary file %s: %s",
1268                       freq->tmpfile, strerror(errno));
1269                 goto abort;
1270         }
1271
1272         git_inflate_init(&freq->stream);
1273
1274         git_SHA1_Init(&freq->c);
1275
1276         freq->url = get_remote_object_url(base_url, hex, 0);
1277
1278         /*
1279          * If a previous temp file is present, process what was already
1280          * fetched.
1281          */
1282         prevlocal = open(prevfile, O_RDONLY);
1283         if (prevlocal != -1) {
1284                 do {
1285                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1286                         if (prev_read>0) {
1287                                 if (fwrite_sha1_file(prev_buf,
1288                                                      1,
1289                                                      prev_read,
1290                                                      freq) == prev_read) {
1291                                         prev_posn += prev_read;
1292                                 } else {
1293                                         prev_read = -1;
1294                                 }
1295                         }
1296                 } while (prev_read > 0);
1297                 close(prevlocal);
1298         }
1299         unlink_or_warn(prevfile);
1300
1301         /*
1302          * Reset inflate/SHA1 if there was an error reading the previous temp
1303          * file; also rewind to the beginning of the local file.
1304          */
1305         if (prev_read == -1) {
1306                 memset(&freq->stream, 0, sizeof(freq->stream));
1307                 git_inflate_init(&freq->stream);
1308                 git_SHA1_Init(&freq->c);
1309                 if (prev_posn>0) {
1310                         prev_posn = 0;
1311                         lseek(freq->localfile, 0, SEEK_SET);
1312                         if (ftruncate(freq->localfile, 0) < 0) {
1313                                 error("Couldn't truncate temporary file %s: %s",
1314                                           freq->tmpfile, strerror(errno));
1315                                 goto abort;
1316                         }
1317                 }
1318         }
1319
1320         freq->slot = get_active_slot();
1321
1322         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1323         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1324         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1325         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1326         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1327
1328         /*
1329          * If we have successfully processed data from a previous fetch
1330          * attempt, only fetch the data we don't already have.
1331          */
1332         if (prev_posn>0) {
1333                 if (http_is_verbose)
1334                         fprintf(stderr,
1335                                 "Resuming fetch of object %s at byte %ld\n",
1336                                 hex, prev_posn);
1337                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1338                 range_header = curl_slist_append(range_header, range);
1339                 curl_easy_setopt(freq->slot->curl,
1340                                  CURLOPT_HTTPHEADER, range_header);
1341         }
1342
1343         return freq;
1344
1345 abort:
1346         free(freq->url);
1347         free(freq);
1348         return NULL;
1349 }
1350
1351 void process_http_object_request(struct http_object_request *freq)
1352 {
1353         if (freq->slot == NULL)
1354                 return;
1355         freq->curl_result = freq->slot->curl_result;
1356         freq->http_code = freq->slot->http_code;
1357         freq->slot = NULL;
1358 }
1359
1360 int finish_http_object_request(struct http_object_request *freq)
1361 {
1362         struct stat st;
1363
1364         close(freq->localfile);
1365         freq->localfile = -1;
1366
1367         process_http_object_request(freq);
1368
1369         if (freq->http_code == 416) {
1370                 warning("requested range invalid; we may already have all the data.");
1371         } else if (freq->curl_result != CURLE_OK) {
1372                 if (stat(freq->tmpfile, &st) == 0)
1373                         if (st.st_size == 0)
1374                                 unlink_or_warn(freq->tmpfile);
1375                 return -1;
1376         }
1377
1378         git_inflate_end(&freq->stream);
1379         git_SHA1_Final(freq->real_sha1, &freq->c);
1380         if (freq->zret != Z_STREAM_END) {
1381                 unlink_or_warn(freq->tmpfile);
1382                 return -1;
1383         }
1384         if (hashcmp(freq->sha1, freq->real_sha1)) {
1385                 unlink_or_warn(freq->tmpfile);
1386                 return -1;
1387         }
1388         freq->rename =
1389                 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1390
1391         return freq->rename;
1392 }
1393
1394 void abort_http_object_request(struct http_object_request *freq)
1395 {
1396         unlink_or_warn(freq->tmpfile);
1397
1398         release_http_object_request(freq);
1399 }
1400
1401 void release_http_object_request(struct http_object_request *freq)
1402 {
1403         if (freq->localfile != -1) {
1404                 close(freq->localfile);
1405                 freq->localfile = -1;
1406         }
1407         if (freq->url != NULL) {
1408                 free(freq->url);
1409                 freq->url = NULL;
1410         }
1411         if (freq->slot != NULL) {
1412                 freq->slot->callback_func = NULL;
1413                 freq->slot->callback_data = NULL;
1414                 release_active_slot(freq->slot);
1415                 freq->slot = NULL;
1416         }
1417 }