http.c

   1 #include "http.h"
   2 #include "pack.h"
   3 #include "sideband.h"
   4 #include "run-command.h"
   5 #include "url.h"
   6
   7 int active_requests;
   8 int http_is_verbose;
   9 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  10
  11 #if LIBCURL_VERSION_NUM >= 0x070a06
  12 #define LIBCURL_CAN_HANDLE_AUTH_ANY
  13 #endif
  14
  15 static int min_curl_sessions = 1;
  16 static int curl_session_count;
  17 #ifdef USE_CURL_MULTI
  18 static int max_requests = -1;
  19 static CURLM *curlm;
  20 #endif
  21 #ifndef NO_CURL_EASY_DUPHANDLE
  22 static CURL *curl_default;
  23 #endif
  24
  25 #define PREV_BUF_SIZE 4096
  26 #define RANGE_HEADER_SIZE 30
  27
  28 char curl_errorstr[CURL_ERROR_SIZE];
  29
  30 static int curl_ssl_verify = -1;
  31 static const char *ssl_cert;
  32 #if LIBCURL_VERSION_NUM >= 0x070903
  33 static const char *ssl_key;
  34 #endif
  35 #if LIBCURL_VERSION_NUM >= 0x070908
  36 static const char *ssl_capath;
  37 #endif
  38 static const char *ssl_cainfo;
  39 static long curl_low_speed_limit = -1;
  40 static long curl_low_speed_time = -1;
  41 static int curl_ftp_no_epsv;
  42 static const char *curl_http_proxy;
  43 static const char *curl_cookie_file;
  44 static char *user_name, *user_pass, *description;
  45 static int http_proactive_auth;
  46 static const char *user_agent;
  47
  48 #if LIBCURL_VERSION_NUM >= 0x071700
  49 /* Use CURLOPT_KEYPASSWD as is */
  50 #elif LIBCURL_VERSION_NUM >= 0x070903
  51 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  52 #else
  53 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  54 #endif
  55
  56 static char *ssl_cert_password;
  57 static int ssl_cert_password_required;
  58
  59 static struct curl_slist *pragma_header;
  60 static struct curl_slist *no_pragma_header;
  61
  62 static struct active_request_slot *active_queue_head;
  63
  64 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  65 {
  66         size_t size = eltsize * nmemb;
  67         struct buffer *buffer = buffer_;
  68
  69         if (size > buffer->buf.len - buffer->posn)
  70                 size = buffer->buf.len - buffer->posn;
  71         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  72         buffer->posn += size;
  73
  74         return size;
  75 }
  76
  77 #ifndef NO_CURL_IOCTL
  78 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  79 {
  80         struct buffer *buffer = clientp;
  81
  82         switch (cmd) {
  83         case CURLIOCMD_NOP:
  84                 return CURLIOE_OK;
  85
  86         case CURLIOCMD_RESTARTREAD:
  87                 buffer->posn = 0;
  88                 return CURLIOE_OK;
  89
  90         default:
  91                 return CURLIOE_UNKNOWNCMD;
  92         }
  93 }
  94 #endif
  95
  96 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  97 {
  98         size_t size = eltsize * nmemb;
  99         struct strbuf *buffer = buffer_;
 100
 101         strbuf_add(buffer, ptr, size);
 102         return size;
 103 }
 104
 105 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 106 {
 107         return eltsize * nmemb;
 108 }
 109
 110 #ifdef USE_CURL_MULTI
 111 static void process_curl_messages(void)
 112 {
 113         int num_messages;
 114         struct active_request_slot *slot;
 115         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 116
 117         while (curl_message != NULL) {
 118                 if (curl_message->msg == CURLMSG_DONE) {
 119                         int curl_result = curl_message->data.result;
 120                         slot = active_queue_head;
 121                         while (slot != NULL &&
 122                                slot->curl != curl_message->easy_handle)
 123                                 slot = slot->next;
 124                         if (slot != NULL) {
 125                                 curl_multi_remove_handle(curlm, slot->curl);
 126                                 slot->curl_result = curl_result;
 127                                 finish_active_slot(slot);
 128                         } else {
 129                                 fprintf(stderr, "Received DONE message for unknown request!\n");
 130                         }
 131                 } else {
 132                         fprintf(stderr, "Unknown CURL message received: %d\n",
 133                                 (int)curl_message->msg);
 134                 }
 135                 curl_message = curl_multi_info_read(curlm, &num_messages);
 136         }
 137 }
 138 #endif
 139
 140 static char *git_getpass_with_description(const char *what, const char *desc)
 141 {
 142         struct strbuf prompt = STRBUF_INIT;
 143         char *r;
 144
 145         if (desc)
 146                 strbuf_addf(&prompt, "%s for '%s': ", what, desc);
 147         else
 148                 strbuf_addf(&prompt, "%s: ", what);
 149         /*
 150          * NEEDSWORK: for usernames, we should do something less magical that
 151          * actually echoes the characters. However, we need to read from
 152          * /dev/tty and not stdio, which is not portable (but getpass will do
 153          * it for us). http.c uses the same workaround.
 154          */
 155         r = git_getpass(prompt.buf);
 156
 157         strbuf_release(&prompt);
 158         return xstrdup(r);
 159 }
 160
 161 static int http_options(const char *var, const char *value, void *cb)
 162 {
 163         if (!strcmp("http.sslverify", var)) {
 164                 curl_ssl_verify = git_config_bool(var, value);
 165                 return 0;
 166         }
 167         if (!strcmp("http.sslcert", var))
 168                 return git_config_string(&ssl_cert, var, value);
 169 #if LIBCURL_VERSION_NUM >= 0x070903
 170         if (!strcmp("http.sslkey", var))
 171                 return git_config_string(&ssl_key, var, value);
 172 #endif
 173 #if LIBCURL_VERSION_NUM >= 0x070908
 174         if (!strcmp("http.sslcapath", var))
 175                 return git_config_string(&ssl_capath, var, value);
 176 #endif
 177         if (!strcmp("http.sslcainfo", var))
 178                 return git_config_string(&ssl_cainfo, var, value);
 179         if (!strcmp("http.sslcertpasswordprotected", var)) {
 180                 if (git_config_bool(var, value))
 181                         ssl_cert_password_required = 1;
 182                 return 0;
 183         }
 184         if (!strcmp("http.minsessions", var)) {
 185                 min_curl_sessions = git_config_int(var, value);
 186 #ifndef USE_CURL_MULTI
 187                 if (min_curl_sessions > 1)
 188                         min_curl_sessions = 1;
 189 #endif
 190                 return 0;
 191         }
 192 #ifdef USE_CURL_MULTI
 193         if (!strcmp("http.maxrequests", var)) {
 194                 max_requests = git_config_int(var, value);
 195                 return 0;
 196         }
 197 #endif
 198         if (!strcmp("http.lowspeedlimit", var)) {
 199                 curl_low_speed_limit = (long)git_config_int(var, value);
 200                 return 0;
 201         }
 202         if (!strcmp("http.lowspeedtime", var)) {
 203                 curl_low_speed_time = (long)git_config_int(var, value);
 204                 return 0;
 205         }
 206
 207         if (!strcmp("http.noepsv", var)) {
 208                 curl_ftp_no_epsv = git_config_bool(var, value);
 209                 return 0;
 210         }
 211         if (!strcmp("http.proxy", var))
 212                 return git_config_string(&curl_http_proxy, var, value);
 213
 214         if (!strcmp("http.cookiefile", var))
 215                 return git_config_string(&curl_cookie_file, var, value);
 216
 217         if (!strcmp("http.postbuffer", var)) {
 218                 http_post_buffer = git_config_int(var, value);
 219                 if (http_post_buffer < LARGE_PACKET_MAX)
 220                         http_post_buffer = LARGE_PACKET_MAX;
 221                 return 0;
 222         }
 223
 224         if (!strcmp("http.useragent", var))
 225                 return git_config_string(&user_agent, var, value);
 226
 227         /* Fall back on the default ones */
 228         return git_default_config(var, value, cb);
 229 }
 230
 231 static void init_curl_http_auth(CURL *result)
 232 {
 233         if (user_name) {
 234                 struct strbuf up = STRBUF_INIT;
 235                 if (!user_pass)
 236                         user_pass = xstrdup(git_getpass_with_description("Password", description));
 237                 strbuf_addf(&up, "%s:%s", user_name, user_pass);
 238                 curl_easy_setopt(result, CURLOPT_USERPWD,
 239                                  strbuf_detach(&up, NULL));
 240         }
 241 }
 242
 243 static int has_cert_password(void)
 244 {
 245         if (ssl_cert_password != NULL)
 246                 return 1;
 247         if (ssl_cert == NULL || ssl_cert_password_required != 1)
 248                 return 0;
 249         /* Only prompt the user once. */
 250         ssl_cert_password_required = -1;
 251         ssl_cert_password = git_getpass_with_description("Certificate Password", description);
 252         if (ssl_cert_password != NULL) {
 253                 ssl_cert_password = xstrdup(ssl_cert_password);
 254                 return 1;
 255         } else
 256                 return 0;
 257 }
 258
 259 static CURL *get_curl_handle(void)
 260 {
 261         CURL *result = curl_easy_init();
 262
 263         if (!curl_ssl_verify) {
 264                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 265                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 266         } else {
 267                 /* Verify authenticity of the peer's certificate */
 268                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 269                 /* The name in the cert must match whom we tried to connect */
 270                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 271         }
 272
 273 #if LIBCURL_VERSION_NUM >= 0x070907
 274         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 275 #endif
 276 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 277         curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 278 #endif
 279
 280         if (http_proactive_auth)
 281                 init_curl_http_auth(result);
 282
 283         if (ssl_cert != NULL)
 284                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 285         if (has_cert_password())
 286                 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
 287 #if LIBCURL_VERSION_NUM >= 0x070903
 288         if (ssl_key != NULL)
 289                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 290 #endif
 291 #if LIBCURL_VERSION_NUM >= 0x070908
 292         if (ssl_capath != NULL)
 293                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 294 #endif
 295         if (ssl_cainfo != NULL)
 296                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 297         curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 298
 299         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 300                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 301                                  curl_low_speed_limit);
 302                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 303                                  curl_low_speed_time);
 304         }
 305
 306         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 307 #if LIBCURL_VERSION_NUM >= 0x071301
 308         curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 309 #elif LIBCURL_VERSION_NUM >= 0x071101
 310         curl_easy_setopt(result, CURLOPT_POST301, 1);
 311 #endif
 312
 313         if (getenv("GIT_CURL_VERBOSE"))
 314                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 315
 316         curl_easy_setopt(result, CURLOPT_USERAGENT,
 317                 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
 318
 319         if (curl_ftp_no_epsv)
 320                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 321
 322         if (curl_http_proxy)
 323                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 324
 325         return result;
 326 }
 327
 328 static void http_auth_init(const char *url)
 329 {
 330         const char *at, *colon, *cp, *slash, *host;
 331
 332         cp = strstr(url, "://");
 333         if (!cp)
 334                 return;
 335
 336         /*
 337          * Ok, the URL looks like "proto://something".  Which one?
 338          * "proto://<user>:<pass>@<host>/...",
 339          * "proto://<user>@<host>/...", or just
 340          * "proto://<host>/..."?
 341          */
 342         cp += 3;
 343         at = strchr(cp, '@');
 344         colon = strchr(cp, ':');
 345         slash = strchrnul(cp, '/');
 346         if (!at || slash <= at) {
 347                 /* No credentials, but we may have to ask for some later */
 348                 host = cp;
 349         }
 350         else if (!colon || at <= colon) {
 351                 /* Only username */
 352                 user_name = url_decode_mem(cp, at - cp);
 353                 user_pass = NULL;
 354                 host = at + 1;
 355         } else {
 356                 user_name = url_decode_mem(cp, colon - cp);
 357                 user_pass = url_decode_mem(colon + 1, at - (colon + 1));
 358                 host = at + 1;
 359         }
 360
 361         description = url_decode_mem(host, slash - host);
 362 }
 363
 364 static void set_from_env(const char **var, const char *envname)
 365 {
 366         const char *val = getenv(envname);
 367         if (val)
 368                 *var = val;
 369 }
 370
 371 void http_init(struct remote *remote, const char *url, int proactive_auth)
 372 {
 373         char *low_speed_limit;
 374         char *low_speed_time;
 375
 376         http_is_verbose = 0;
 377
 378         git_config(http_options, NULL);
 379
 380         curl_global_init(CURL_GLOBAL_ALL);
 381
 382         http_proactive_auth = proactive_auth;
 383
 384         if (remote && remote->http_proxy)
 385                 curl_http_proxy = xstrdup(remote->http_proxy);
 386
 387         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 388         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 389
 390 #ifdef USE_CURL_MULTI
 391         {
 392                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 393                 if (http_max_requests != NULL)
 394                         max_requests = atoi(http_max_requests);
 395         }
 396
 397         curlm = curl_multi_init();
 398         if (curlm == NULL) {
 399                 fprintf(stderr, "Error creating curl multi handle.\n");
 400                 exit(1);
 401         }
 402 #endif
 403
 404         if (getenv("GIT_SSL_NO_VERIFY"))
 405                 curl_ssl_verify = 0;
 406
 407         set_from_env(&ssl_cert, "GIT_SSL_CERT");
 408 #if LIBCURL_VERSION_NUM >= 0x070903
 409         set_from_env(&ssl_key, "GIT_SSL_KEY");
 410 #endif
 411 #if LIBCURL_VERSION_NUM >= 0x070908
 412         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 413 #endif
 414         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 415
 416         set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 417
 418         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 419         if (low_speed_limit != NULL)
 420                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 421         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 422         if (low_speed_time != NULL)
 423                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 424
 425         if (curl_ssl_verify == -1)
 426                 curl_ssl_verify = 1;
 427
 428         curl_session_count = 0;
 429 #ifdef USE_CURL_MULTI
 430         if (max_requests < 1)
 431                 max_requests = DEFAULT_MAX_REQUESTS;
 432 #endif
 433
 434         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 435                 curl_ftp_no_epsv = 1;
 436
 437         if (url) {
 438                 http_auth_init(url);
 439                 if (!ssl_cert_password_required &&
 440                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 441                     !prefixcmp(url, "https://"))
 442                         ssl_cert_password_required = 1;
 443         }
 444
 445 #ifndef NO_CURL_EASY_DUPHANDLE
 446         curl_default = get_curl_handle();
 447 #endif
 448 }
 449
 450 void http_cleanup(void)
 451 {
 452         struct active_request_slot *slot = active_queue_head;
 453
 454         while (slot != NULL) {
 455                 struct active_request_slot *next = slot->next;
 456                 if (slot->curl != NULL) {
 457 #ifdef USE_CURL_MULTI
 458                         curl_multi_remove_handle(curlm, slot->curl);
 459 #endif
 460                         curl_easy_cleanup(slot->curl);
 461                 }
 462                 free(slot);
 463                 slot = next;
 464         }
 465         active_queue_head = NULL;
 466
 467 #ifndef NO_CURL_EASY_DUPHANDLE
 468         curl_easy_cleanup(curl_default);
 469 #endif
 470
 471 #ifdef USE_CURL_MULTI
 472         curl_multi_cleanup(curlm);
 473 #endif
 474         curl_global_cleanup();
 475
 476         curl_slist_free_all(pragma_header);
 477         pragma_header = NULL;
 478
 479         curl_slist_free_all(no_pragma_header);
 480         no_pragma_header = NULL;
 481
 482         if (curl_http_proxy) {
 483                 free((void *)curl_http_proxy);
 484                 curl_http_proxy = NULL;
 485         }
 486
 487         if (ssl_cert_password != NULL) {
 488                 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
 489                 free(ssl_cert_password);
 490                 ssl_cert_password = NULL;
 491         }
 492         ssl_cert_password_required = 0;
 493 }
 494
 495 struct active_request_slot *get_active_slot(void)
 496 {
 497         struct active_request_slot *slot = active_queue_head;
 498         struct active_request_slot *newslot;
 499
 500 #ifdef USE_CURL_MULTI
 501         int num_transfers;
 502
 503         /* Wait for a slot to open up if the queue is full */
 504         while (active_requests >= max_requests) {
 505                 curl_multi_perform(curlm, &num_transfers);
 506                 if (num_transfers < active_requests)
 507                         process_curl_messages();
 508         }
 509 #endif
 510
 511         while (slot != NULL && slot->in_use)
 512                 slot = slot->next;
 513
 514         if (slot == NULL) {
 515                 newslot = xmalloc(sizeof(*newslot));
 516                 newslot->curl = NULL;
 517                 newslot->in_use = 0;
 518                 newslot->next = NULL;
 519
 520                 slot = active_queue_head;
 521                 if (slot == NULL) {
 522                         active_queue_head = newslot;
 523                 } else {
 524                         while (slot->next != NULL)
 525                                 slot = slot->next;
 526                         slot->next = newslot;
 527                 }
 528                 slot = newslot;
 529         }
 530
 531         if (slot->curl == NULL) {
 532 #ifdef NO_CURL_EASY_DUPHANDLE
 533                 slot->curl = get_curl_handle();
 534 #else
 535                 slot->curl = curl_easy_duphandle(curl_default);
 536 #endif
 537                 curl_session_count++;
 538         }
 539
 540         active_requests++;
 541         slot->in_use = 1;
 542         slot->results = NULL;
 543         slot->finished = NULL;
 544         slot->callback_data = NULL;
 545         slot->callback_func = NULL;
 546         curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 547         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 548         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 549         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 550         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 551         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 552         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 553         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 554         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 555
 556         return slot;
 557 }
 558
 559 int start_active_slot(struct active_request_slot *slot)
 560 {
 561 #ifdef USE_CURL_MULTI
 562         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 563         int num_transfers;
 564
 565         if (curlm_result != CURLM_OK &&
 566             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 567                 active_requests--;
 568                 slot->in_use = 0;
 569                 return 0;
 570         }
 571
 572         /*
 573          * We know there must be something to do, since we just added
 574          * something.
 575          */
 576         curl_multi_perform(curlm, &num_transfers);
 577 #endif
 578         return 1;
 579 }
 580
 581 #ifdef USE_CURL_MULTI
 582 struct fill_chain {
 583         void *data;
 584         int (*fill)(void *);
 585         struct fill_chain *next;
 586 };
 587
 588 static struct fill_chain *fill_cfg;
 589
 590 void add_fill_function(void *data, int (*fill)(void *))
 591 {
 592         struct fill_chain *new = xmalloc(sizeof(*new));
 593         struct fill_chain **linkp = &fill_cfg;
 594         new->data = data;
 595         new->fill = fill;
 596         new->next = NULL;
 597         while (*linkp)
 598                 linkp = &(*linkp)->next;
 599         *linkp = new;
 600 }
 601
 602 void fill_active_slots(void)
 603 {
 604         struct active_request_slot *slot = active_queue_head;
 605
 606         while (active_requests < max_requests) {
 607                 struct fill_chain *fill;
 608                 for (fill = fill_cfg; fill; fill = fill->next)
 609                         if (fill->fill(fill->data))
 610                                 break;
 611
 612                 if (!fill)
 613                         break;
 614         }
 615
 616         while (slot != NULL) {
 617                 if (!slot->in_use && slot->curl != NULL
 618                         && curl_session_count > min_curl_sessions) {
 619                         curl_easy_cleanup(slot->curl);
 620                         slot->curl = NULL;
 621                         curl_session_count--;
 622                 }
 623                 slot = slot->next;
 624         }
 625 }
 626
 627 void step_active_slots(void)
 628 {
 629         int num_transfers;
 630         CURLMcode curlm_result;
 631
 632         do {
 633                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 634         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 635         if (num_transfers < active_requests) {
 636                 process_curl_messages();
 637                 fill_active_slots();
 638         }
 639 }
 640 #endif
 641
 642 void run_active_slot(struct active_request_slot *slot)
 643 {
 644 #ifdef USE_CURL_MULTI
 645         fd_set readfds;
 646         fd_set writefds;
 647         fd_set excfds;
 648         int max_fd;
 649         struct timeval select_timeout;
 650         int finished = 0;
 651
 652         slot->finished = &finished;
 653         while (!finished) {
 654                 step_active_slots();
 655
 656                 if (slot->in_use) {
 657 #if LIBCURL_VERSION_NUM >= 0x070f04
 658                         long curl_timeout;
 659                         curl_multi_timeout(curlm, &curl_timeout);
 660                         if (curl_timeout == 0) {
 661                                 continue;
 662                         } else if (curl_timeout == -1) {
 663                                 select_timeout.tv_sec  = 0;
 664                                 select_timeout.tv_usec = 50000;
 665                         } else {
 666                                 select_timeout.tv_sec  =  curl_timeout / 1000;
 667                                 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 668                         }
 669 #else
 670                         select_timeout.tv_sec  = 0;
 671                         select_timeout.tv_usec = 50000;
 672 #endif
 673
 674                         max_fd = -1;
 675                         FD_ZERO(&readfds);
 676                         FD_ZERO(&writefds);
 677                         FD_ZERO(&excfds);
 678                         curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 679
 680                         select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
 681                 }
 682         }
 683 #else
 684         while (slot->in_use) {
 685                 slot->curl_result = curl_easy_perform(slot->curl);
 686                 finish_active_slot(slot);
 687         }
 688 #endif
 689 }
 690
 691 static void closedown_active_slot(struct active_request_slot *slot)
 692 {
 693         active_requests--;
 694         slot->in_use = 0;
 695 }
 696
 697 static void release_active_slot(struct active_request_slot *slot)
 698 {
 699         closedown_active_slot(slot);
 700         if (slot->curl && curl_session_count > min_curl_sessions) {
 701 #ifdef USE_CURL_MULTI
 702                 curl_multi_remove_handle(curlm, slot->curl);
 703 #endif
 704                 curl_easy_cleanup(slot->curl);
 705                 slot->curl = NULL;
 706                 curl_session_count--;
 707         }
 708 #ifdef USE_CURL_MULTI
 709         fill_active_slots();
 710 #endif
 711 }
 712
 713 void finish_active_slot(struct active_request_slot *slot)
 714 {
 715         closedown_active_slot(slot);
 716         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 717
 718         if (slot->finished != NULL)
 719                 (*slot->finished) = 1;
 720
 721         /* Store slot results so they can be read after the slot is reused */
 722         if (slot->results != NULL) {
 723                 slot->results->curl_result = slot->curl_result;
 724                 slot->results->http_code = slot->http_code;
 725         }
 726
 727         /* Run callback if appropriate */
 728         if (slot->callback_func != NULL)
 729                 slot->callback_func(slot->callback_data);
 730 }
 731
 732 void finish_all_active_slots(void)
 733 {
 734         struct active_request_slot *slot = active_queue_head;
 735
 736         while (slot != NULL)
 737                 if (slot->in_use) {
 738                         run_active_slot(slot);
 739                         slot = active_queue_head;
 740                 } else {
 741                         slot = slot->next;
 742                 }
 743 }
 744
 745 /* Helpers for modifying and creating URLs */
 746 static inline int needs_quote(int ch)
 747 {
 748         if (((ch >= 'A') && (ch <= 'Z'))
 749                         || ((ch >= 'a') && (ch <= 'z'))
 750                         || ((ch >= '0') && (ch <= '9'))
 751                         || (ch == '/')
 752                         || (ch == '-')
 753                         || (ch == '.'))
 754                 return 0;
 755         return 1;
 756 }
 757
 758 static char *quote_ref_url(const char *base, const char *ref)
 759 {
 760         struct strbuf buf = STRBUF_INIT;
 761         const char *cp;
 762         int ch;
 763
 764         end_url_with_slash(&buf, base);
 765
 766         for (cp = ref; (ch = *cp) != 0; cp++)
 767                 if (needs_quote(ch))
 768                         strbuf_addf(&buf, "%%%02x", ch);
 769                 else
 770                         strbuf_addch(&buf, *cp);
 771
 772         return strbuf_detach(&buf, NULL);
 773 }
 774
 775 void append_remote_object_url(struct strbuf *buf, const char *url,
 776                               const char *hex,
 777                               int only_two_digit_prefix)
 778 {
 779         end_url_with_slash(buf, url);
 780
 781         strbuf_addf(buf, "objects/%.*s/", 2, hex);
 782         if (!only_two_digit_prefix)
 783                 strbuf_addf(buf, "%s", hex+2);
 784 }
 785
 786 char *get_remote_object_url(const char *url, const char *hex,
 787                             int only_two_digit_prefix)
 788 {
 789         struct strbuf buf = STRBUF_INIT;
 790         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 791         return strbuf_detach(&buf, NULL);
 792 }
 793
 794 /* http_request() targets */
 795 #define HTTP_REQUEST_STRBUF     0
 796 #define HTTP_REQUEST_FILE       1
 797
 798 static int http_request(const char *url, void *result, int target, int options)
 799 {
 800         struct active_request_slot *slot;
 801         struct slot_results results;
 802         struct curl_slist *headers = NULL;
 803         struct strbuf buf = STRBUF_INIT;
 804         int ret;
 805
 806         slot = get_active_slot();
 807         slot->results = &results;
 808         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 809
 810         if (result == NULL) {
 811                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 812         } else {
 813                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 814                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 815
 816                 if (target == HTTP_REQUEST_FILE) {
 817                         long posn = ftell(result);
 818                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 819                                          fwrite);
 820                         if (posn > 0) {
 821                                 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 822                                 headers = curl_slist_append(headers, buf.buf);
 823                                 strbuf_reset(&buf);
 824                         }
 825                 } else
 826                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 827                                          fwrite_buffer);
 828         }
 829
 830         strbuf_addstr(&buf, "Pragma:");
 831         if (options & HTTP_NO_CACHE)
 832                 strbuf_addstr(&buf, " no-cache");
 833
 834         headers = curl_slist_append(headers, buf.buf);
 835
 836         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 837         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 838
 839         if (start_active_slot(slot)) {
 840                 run_active_slot(slot);
 841                 if (results.curl_result == CURLE_OK)
 842                         ret = HTTP_OK;
 843                 else if (missing_target(&results))
 844                         ret = HTTP_MISSING_TARGET;
 845                 else if (results.http_code == 401) {
 846                         if (user_name && user_pass) {
 847                                 ret = HTTP_NOAUTH;
 848                         } else {
 849                                 /*
 850                                  * git_getpass is needed here because its very likely stdin/stdout are
 851                                  * pipes to our parent process.  So we instead need to use /dev/tty,
 852                                  * but that is non-portable.  Using git_getpass() can at least be stubbed
 853                                  * on other platforms with a different implementation if/when necessary.
 854                                  */
 855                                 if (!user_name)
 856                                         user_name = xstrdup(git_getpass_with_description("Username", description));
 857                                 init_curl_http_auth(slot->curl);
 858                                 ret = HTTP_REAUTH;
 859                         }
 860                 } else {
 861                         if (!curl_errorstr[0])
 862                                 strlcpy(curl_errorstr,
 863                                         curl_easy_strerror(results.curl_result),
 864                                         sizeof(curl_errorstr));
 865                         ret = HTTP_ERROR;
 866                 }
 867         } else {
 868                 error("Unable to start HTTP request for %s", url);
 869                 ret = HTTP_START_FAILED;
 870         }
 871
 872         curl_slist_free_all(headers);
 873         strbuf_release(&buf);
 874
 875         return ret;
 876 }
 877
 878 static int http_request_reauth(const char *url, void *result, int target,
 879                                int options)
 880 {
 881         int ret = http_request(url, result, target, options);
 882         if (ret != HTTP_REAUTH)
 883                 return ret;
 884         return http_request(url, result, target, options);
 885 }
 886
 887 int http_get_strbuf(const char *url, struct strbuf *result, int options)
 888 {
 889         return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
 890 }
 891
 892 /*
 893  * Downloads an url and stores the result in the given file.
 894  *
 895  * If a previous interrupted download is detected (i.e. a previous temporary
 896  * file is still around) the download is resumed.
 897  */
 898 static int http_get_file(const char *url, const char *filename, int options)
 899 {
 900         int ret;
 901         struct strbuf tmpfile = STRBUF_INIT;
 902         FILE *result;
 903
 904         strbuf_addf(&tmpfile, "%s.temp", filename);
 905         result = fopen(tmpfile.buf, "a");
 906         if (! result) {
 907                 error("Unable to open local file %s", tmpfile.buf);
 908                 ret = HTTP_ERROR;
 909                 goto cleanup;
 910         }
 911
 912         ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
 913         fclose(result);
 914
 915         if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 916                 ret = HTTP_ERROR;
 917 cleanup:
 918         strbuf_release(&tmpfile);
 919         return ret;
 920 }
 921
 922 int http_error(const char *url, int ret)
 923 {
 924         /* http_request has already handled HTTP_START_FAILED. */
 925         if (ret != HTTP_START_FAILED)
 926                 error("%s while accessing %s", curl_errorstr, url);
 927
 928         return ret;
 929 }
 930
 931 int http_fetch_ref(const char *base, struct ref *ref)
 932 {
 933         char *url;
 934         struct strbuf buffer = STRBUF_INIT;
 935         int ret = -1;
 936
 937         url = quote_ref_url(base, ref->name);
 938         if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 939                 strbuf_rtrim(&buffer);
 940                 if (buffer.len == 40)
 941                         ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 942                 else if (!prefixcmp(buffer.buf, "ref: ")) {
 943                         ref->symref = xstrdup(buffer.buf + 5);
 944                         ret = 0;
 945                 }
 946         }
 947
 948         strbuf_release(&buffer);
 949         free(url);
 950         return ret;
 951 }
 952
 953 /* Helpers for fetching packs */
 954 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
 955 {
 956         char *url, *tmp;
 957         struct strbuf buf = STRBUF_INIT;
 958
 959         if (http_is_verbose)
 960                 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
 961
 962         end_url_with_slash(&buf, base_url);
 963         strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
 964         url = strbuf_detach(&buf, NULL);
 965
 966         strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
 967         tmp = strbuf_detach(&buf, NULL);
 968
 969         if (http_get_file(url, tmp, 0) != HTTP_OK) {
 970                 error("Unable to get pack index %s\n", url);
 971                 free(tmp);
 972                 tmp = NULL;
 973         }
 974
 975         free(url);
 976         return tmp;
 977 }
 978
 979 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
 980         unsigned char *sha1, const char *base_url)
 981 {
 982         struct packed_git *new_pack;
 983         char *tmp_idx = NULL;
 984         int ret;
 985
 986         if (has_pack_index(sha1)) {
 987                 new_pack = parse_pack_index(sha1, NULL);
 988                 if (!new_pack)
 989                         return -1; /* parse_pack_index() already issued error message */
 990                 goto add_pack;
 991         }
 992
 993         tmp_idx = fetch_pack_index(sha1, base_url);
 994         if (!tmp_idx)
 995                 return -1;
 996
 997         new_pack = parse_pack_index(sha1, tmp_idx);
 998         if (!new_pack) {
 999                 unlink(tmp_idx);
1000                 free(tmp_idx);
1001
1002                 return -1; /* parse_pack_index() already issued error message */
1003         }
1004
1005         ret = verify_pack_index(new_pack);
1006         if (!ret) {
1007                 close_pack_index(new_pack);
1008                 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1009         }
1010         free(tmp_idx);
1011         if (ret)
1012                 return -1;
1013
1014 add_pack:
1015         new_pack->next = *packs_head;
1016         *packs_head = new_pack;
1017         return 0;
1018 }
1019
1020 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1021 {
1022         int ret = 0, i = 0;
1023         char *url, *data;
1024         struct strbuf buf = STRBUF_INIT;
1025         unsigned char sha1[20];
1026
1027         end_url_with_slash(&buf, base_url);
1028         strbuf_addstr(&buf, "objects/info/packs");
1029         url = strbuf_detach(&buf, NULL);
1030
1031         ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1032         if (ret != HTTP_OK)
1033                 goto cleanup;
1034
1035         data = buf.buf;
1036         while (i < buf.len) {
1037                 switch (data[i]) {
1038                 case 'P':
1039                         i++;
1040                         if (i + 52 <= buf.len &&
1041                             !prefixcmp(data + i, " pack-") &&
1042                             !prefixcmp(data + i + 46, ".pack\n")) {
1043                                 get_sha1_hex(data + i + 6, sha1);
1044                                 fetch_and_setup_pack_index(packs_head, sha1,
1045                                                       base_url);
1046                                 i += 51;
1047                                 break;
1048                         }
1049                 default:
1050                         while (i < buf.len && data[i] != '\n')
1051                                 i++;
1052                 }
1053                 i++;
1054         }
1055
1056 cleanup:
1057         free(url);
1058         return ret;
1059 }
1060
1061 void release_http_pack_request(struct http_pack_request *preq)
1062 {
1063         if (preq->packfile != NULL) {
1064                 fclose(preq->packfile);
1065                 preq->packfile = NULL;
1066         }
1067         if (preq->range_header != NULL) {
1068                 curl_slist_free_all(preq->range_header);
1069                 preq->range_header = NULL;
1070         }
1071         preq->slot = NULL;
1072         free(preq->url);
1073 }
1074
1075 int finish_http_pack_request(struct http_pack_request *preq)
1076 {
1077         struct packed_git **lst;
1078         struct packed_git *p = preq->target;
1079         char *tmp_idx;
1080         struct child_process ip;
1081         const char *ip_argv[8];
1082
1083         close_pack_index(p);
1084
1085         fclose(preq->packfile);
1086         preq->packfile = NULL;
1087
1088         lst = preq->lst;
1089         while (*lst != p)
1090                 lst = &((*lst)->next);
1091         *lst = (*lst)->next;
1092
1093         tmp_idx = xstrdup(preq->tmpfile);
1094         strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1095                ".idx.temp");
1096
1097         ip_argv[0] = "index-pack";
1098         ip_argv[1] = "-o";
1099         ip_argv[2] = tmp_idx;
1100         ip_argv[3] = preq->tmpfile;
1101         ip_argv[4] = NULL;
1102
1103         memset(&ip, 0, sizeof(ip));
1104         ip.argv = ip_argv;
1105         ip.git_cmd = 1;
1106         ip.no_stdin = 1;
1107         ip.no_stdout = 1;
1108
1109         if (run_command(&ip)) {
1110                 unlink(preq->tmpfile);
1111                 unlink(tmp_idx);
1112                 free(tmp_idx);
1113                 return -1;
1114         }
1115
1116         unlink(sha1_pack_index_name(p->sha1));
1117
1118         if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1119          || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1120                 free(tmp_idx);
1121                 return -1;
1122         }
1123
1124         install_packed_git(p);
1125         free(tmp_idx);
1126         return 0;
1127 }
1128
1129 struct http_pack_request *new_http_pack_request(
1130         struct packed_git *target, const char *base_url)
1131 {
1132         long prev_posn = 0;
1133         char range[RANGE_HEADER_SIZE];
1134         struct strbuf buf = STRBUF_INIT;
1135         struct http_pack_request *preq;
1136
1137         preq = xcalloc(1, sizeof(*preq));
1138         preq->target = target;
1139
1140         end_url_with_slash(&buf, base_url);
1141         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1142                 sha1_to_hex(target->sha1));
1143         preq->url = strbuf_detach(&buf, NULL);
1144
1145         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1146                 sha1_pack_name(target->sha1));
1147         preq->packfile = fopen(preq->tmpfile, "a");
1148         if (!preq->packfile) {
1149                 error("Unable to open local file %s for pack",
1150                       preq->tmpfile);
1151                 goto abort;
1152         }
1153
1154         preq->slot = get_active_slot();
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         return size;
1212 }
1213
1214 struct http_object_request *new_http_object_request(const char *base_url,
1215         unsigned char *sha1)
1216 {
1217         char *hex = sha1_to_hex(sha1);
1218         char *filename;
1219         char prevfile[PATH_MAX];
1220         int prevlocal;
1221         char prev_buf[PREV_BUF_SIZE];
1222         ssize_t prev_read = 0;
1223         long prev_posn = 0;
1224         char range[RANGE_HEADER_SIZE];
1225         struct curl_slist *range_header = NULL;
1226         struct http_object_request *freq;
1227
1228         freq = xcalloc(1, sizeof(*freq));
1229         hashcpy(freq->sha1, sha1);
1230         freq->localfile = -1;
1231
1232         filename = sha1_file_name(sha1);
1233         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1234                  "%s.temp", filename);
1235
1236         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1237         unlink_or_warn(prevfile);
1238         rename(freq->tmpfile, prevfile);
1239         unlink_or_warn(freq->tmpfile);
1240
1241         if (freq->localfile != -1)
1242                 error("fd leakage in start: %d", freq->localfile);
1243         freq->localfile = open(freq->tmpfile,
1244                                O_WRONLY | O_CREAT | O_EXCL, 0666);
1245         /*
1246          * This could have failed due to the "lazy directory creation";
1247          * try to mkdir the last path component.
1248          */
1249         if (freq->localfile < 0 && errno == ENOENT) {
1250                 char *dir = strrchr(freq->tmpfile, '/');
1251                 if (dir) {
1252                         *dir = 0;
1253                         mkdir(freq->tmpfile, 0777);
1254                         *dir = '/';
1255                 }
1256                 freq->localfile = open(freq->tmpfile,
1257                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
1258         }
1259
1260         if (freq->localfile < 0) {
1261                 error("Couldn't create temporary file %s: %s",
1262                       freq->tmpfile, strerror(errno));
1263                 goto abort;
1264         }
1265
1266         git_inflate_init(&freq->stream);
1267
1268         git_SHA1_Init(&freq->c);
1269
1270         freq->url = get_remote_object_url(base_url, hex, 0);
1271
1272         /*
1273          * If a previous temp file is present, process what was already
1274          * fetched.
1275          */
1276         prevlocal = open(prevfile, O_RDONLY);
1277         if (prevlocal != -1) {
1278                 do {
1279                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1280                         if (prev_read>0) {
1281                                 if (fwrite_sha1_file(prev_buf,
1282                                                      1,
1283                                                      prev_read,
1284                                                      freq) == prev_read) {
1285                                         prev_posn += prev_read;
1286                                 } else {
1287                                         prev_read = -1;
1288                                 }
1289                         }
1290                 } while (prev_read > 0);
1291                 close(prevlocal);
1292         }
1293         unlink_or_warn(prevfile);
1294
1295         /*
1296          * Reset inflate/SHA1 if there was an error reading the previous temp
1297          * file; also rewind to the beginning of the local file.
1298          */
1299         if (prev_read == -1) {
1300                 memset(&freq->stream, 0, sizeof(freq->stream));
1301                 git_inflate_init(&freq->stream);
1302                 git_SHA1_Init(&freq->c);
1303                 if (prev_posn>0) {
1304                         prev_posn = 0;
1305                         lseek(freq->localfile, 0, SEEK_SET);
1306                         if (ftruncate(freq->localfile, 0) < 0) {
1307                                 error("Couldn't truncate temporary file %s: %s",
1308                                           freq->tmpfile, strerror(errno));
1309                                 goto abort;
1310                         }
1311                 }
1312         }
1313
1314         freq->slot = get_active_slot();
1315
1316         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1317         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1318         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1319         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1320         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1321
1322         /*
1323          * If we have successfully processed data from a previous fetch
1324          * attempt, only fetch the data we don't already have.
1325          */
1326         if (prev_posn>0) {
1327                 if (http_is_verbose)
1328                         fprintf(stderr,
1329                                 "Resuming fetch of object %s at byte %ld\n",
1330                                 hex, prev_posn);
1331                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1332                 range_header = curl_slist_append(range_header, range);
1333                 curl_easy_setopt(freq->slot->curl,
1334                                  CURLOPT_HTTPHEADER, range_header);
1335         }
1336
1337         return freq;
1338
1339 abort:
1340         free(freq->url);
1341         free(freq);
1342         return NULL;
1343 }
1344
1345 void process_http_object_request(struct http_object_request *freq)
1346 {
1347         if (freq->slot == NULL)
1348                 return;
1349         freq->curl_result = freq->slot->curl_result;
1350         freq->http_code = freq->slot->http_code;
1351         freq->slot = NULL;
1352 }
1353
1354 int finish_http_object_request(struct http_object_request *freq)
1355 {
1356         struct stat st;
1357
1358         close(freq->localfile);
1359         freq->localfile = -1;
1360
1361         process_http_object_request(freq);
1362
1363         if (freq->http_code == 416) {
1364                 warning("requested range invalid; we may already have all the data.");
1365         } else if (freq->curl_result != CURLE_OK) {
1366                 if (stat(freq->tmpfile, &st) == 0)
1367                         if (st.st_size == 0)
1368                                 unlink_or_warn(freq->tmpfile);
1369                 return -1;
1370         }
1371
1372         git_inflate_end(&freq->stream);
1373         git_SHA1_Final(freq->real_sha1, &freq->c);
1374         if (freq->zret != Z_STREAM_END) {
1375                 unlink_or_warn(freq->tmpfile);
1376                 return -1;
1377         }
1378         if (hashcmp(freq->sha1, freq->real_sha1)) {
1379                 unlink_or_warn(freq->tmpfile);
1380                 return -1;
1381         }
1382         freq->rename =
1383                 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1384
1385         return freq->rename;
1386 }
1387
1388 void abort_http_object_request(struct http_object_request *freq)
1389 {
1390         unlink_or_warn(freq->tmpfile);
1391
1392         release_http_object_request(freq);
1393 }
1394
1395 void release_http_object_request(struct http_object_request *freq)
1396 {
1397         if (freq->localfile != -1) {
1398                 close(freq->localfile);
1399                 freq->localfile = -1;
1400         }
1401         if (freq->url != NULL) {
1402                 free(freq->url);
1403                 freq->url = NULL;
1404         }
1405         if (freq->slot != NULL) {
1406                 freq->slot->callback_func = NULL;
1407                 freq->slot->callback_data = NULL;
1408                 release_active_slot(freq->slot);
1409                 freq->slot = NULL;
1410         }
1411 }