git.oblomov.eu Git - git/blob - http.c

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