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