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

   1 #include "git-compat-util.h"
   2 #include "http.h"
   3 #include "pack.h"
   4 #include "sideband.h"
   5 #include "run-command.h"
   6 #include "url.h"
   7 #include "urlmatch.h"
   8 #include "credential.h"
   9 #include "version.h"
  10 #include "pkt-line.h"
  11 #include "gettext.h"
  12 #include "transport.h"
  13
  14 #if LIBCURL_VERSION_NUM >= 0x070a08
  15 long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
  16 #else
  17 long int git_curl_ipresolve;
  18 #endif
  19 int active_requests;
  20 int http_is_verbose;
  21 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  22
  23 #if LIBCURL_VERSION_NUM >= 0x070a06
  24 #define LIBCURL_CAN_HANDLE_AUTH_ANY
  25 #endif
  26
  27 static int min_curl_sessions = 1;
  28 static int curl_session_count;
  29 #ifdef USE_CURL_MULTI
  30 static int max_requests = -1;
  31 static CURLM *curlm;
  32 #endif
  33 #ifndef NO_CURL_EASY_DUPHANDLE
  34 static CURL *curl_default;
  35 #endif
  36
  37 #define PREV_BUF_SIZE 4096
  38
  39 char curl_errorstr[CURL_ERROR_SIZE];
  40
  41 static int curl_ssl_verify = -1;
  42 static int curl_ssl_try;
  43 static const char *ssl_cert;
  44 static const char *ssl_cipherlist;
  45 static const char *ssl_version;
  46 static struct {
  47         const char *name;
  48         long ssl_version;
  49 } sslversions[] = {
  50         { "sslv2", CURL_SSLVERSION_SSLv2 },
  51         { "sslv3", CURL_SSLVERSION_SSLv3 },
  52         { "tlsv1", CURL_SSLVERSION_TLSv1 },
  53 #if LIBCURL_VERSION_NUM >= 0x072200
  54         { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
  55         { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
  56         { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
  57 #endif
  58 };
  59 #if LIBCURL_VERSION_NUM >= 0x070903
  60 static const char *ssl_key;
  61 #endif
  62 #if LIBCURL_VERSION_NUM >= 0x070908
  63 static const char *ssl_capath;
  64 #endif
  65 #if LIBCURL_VERSION_NUM >= 0x072c00
  66 static const char *ssl_pinnedkey;
  67 #endif
  68 static const char *ssl_cainfo;
  69 static long curl_low_speed_limit = -1;
  70 static long curl_low_speed_time = -1;
  71 static int curl_ftp_no_epsv;
  72 static const char *curl_http_proxy;
  73 static const char *http_proxy_authmethod;
  74 static struct {
  75         const char *name;
  76         long curlauth_param;
  77 } proxy_authmethods[] = {
  78         { "basic", CURLAUTH_BASIC },
  79         { "digest", CURLAUTH_DIGEST },
  80         { "negotiate", CURLAUTH_GSSNEGOTIATE },
  81         { "ntlm", CURLAUTH_NTLM },
  82 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
  83         { "anyauth", CURLAUTH_ANY },
  84 #endif
  85         /*
  86          * CURLAUTH_DIGEST_IE has no corresponding command-line option in
  87          * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
  88          * here, too
  89          */
  90 };
  91 static struct credential proxy_auth = CREDENTIAL_INIT;
  92 static const char *curl_proxyuserpwd;
  93 static const char *curl_cookie_file;
  94 static int curl_save_cookies;
  95 struct credential http_auth = CREDENTIAL_INIT;
  96 static int http_proactive_auth;
  97 static const char *user_agent;
  98 static int curl_empty_auth;
  99
 100 #if LIBCURL_VERSION_NUM >= 0x071700
 101 /* Use CURLOPT_KEYPASSWD as is */
 102 #elif LIBCURL_VERSION_NUM >= 0x070903
 103 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
 104 #else
 105 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
 106 #endif
 107
 108 static struct credential cert_auth = CREDENTIAL_INIT;
 109 static int ssl_cert_password_required;
 110 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 111 static unsigned long http_auth_methods = CURLAUTH_ANY;
 112 #endif
 113
 114 static struct curl_slist *pragma_header;
 115 static struct curl_slist *no_pragma_header;
 116
 117 static struct active_request_slot *active_queue_head;
 118
 119 static char *cached_accept_language;
 120
 121 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 122 {
 123         size_t size = eltsize * nmemb;
 124         struct buffer *buffer = buffer_;
 125
 126         if (size > buffer->buf.len - buffer->posn)
 127                 size = buffer->buf.len - buffer->posn;
 128         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
 129         buffer->posn += size;
 130
 131         return size;
 132 }
 133
 134 #ifndef NO_CURL_IOCTL
 135 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
 136 {
 137         struct buffer *buffer = clientp;
 138
 139         switch (cmd) {
 140         case CURLIOCMD_NOP:
 141                 return CURLIOE_OK;
 142
 143         case CURLIOCMD_RESTARTREAD:
 144                 buffer->posn = 0;
 145                 return CURLIOE_OK;
 146
 147         default:
 148                 return CURLIOE_UNKNOWNCMD;
 149         }
 150 }
 151 #endif
 152
 153 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 154 {
 155         size_t size = eltsize * nmemb;
 156         struct strbuf *buffer = buffer_;
 157
 158         strbuf_add(buffer, ptr, size);
 159         return size;
 160 }
 161
 162 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 163 {
 164         return eltsize * nmemb;
 165 }
 166
 167 static void closedown_active_slot(struct active_request_slot *slot)
 168 {
 169         active_requests--;
 170         slot->in_use = 0;
 171 }
 172
 173 static void finish_active_slot(struct active_request_slot *slot)
 174 {
 175         closedown_active_slot(slot);
 176         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 177
 178         if (slot->finished != NULL)
 179                 (*slot->finished) = 1;
 180
 181         /* Store slot results so they can be read after the slot is reused */
 182         if (slot->results != NULL) {
 183                 slot->results->curl_result = slot->curl_result;
 184                 slot->results->http_code = slot->http_code;
 185 #if LIBCURL_VERSION_NUM >= 0x070a08
 186                 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 187                                   &slot->results->auth_avail);
 188 #else
 189                 slot->results->auth_avail = 0;
 190 #endif
 191
 192                 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
 193                         &slot->results->http_connectcode);
 194         }
 195
 196         /* Run callback if appropriate */
 197         if (slot->callback_func != NULL)
 198                 slot->callback_func(slot->callback_data);
 199 }
 200
 201 #ifdef USE_CURL_MULTI
 202 static void process_curl_messages(void)
 203 {
 204         int num_messages;
 205         struct active_request_slot *slot;
 206         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 207
 208         while (curl_message != NULL) {
 209                 if (curl_message->msg == CURLMSG_DONE) {
 210                         int curl_result = curl_message->data.result;
 211                         slot = active_queue_head;
 212                         while (slot != NULL &&
 213                                slot->curl != curl_message->easy_handle)
 214                                 slot = slot->next;
 215                         if (slot != NULL) {
 216                                 curl_multi_remove_handle(curlm, slot->curl);
 217                                 slot->curl_result = curl_result;
 218                                 finish_active_slot(slot);
 219                         } else {
 220                                 fprintf(stderr, "Received DONE message for unknown request!\n");
 221                         }
 222                 } else {
 223                         fprintf(stderr, "Unknown CURL message received: %d\n",
 224                                 (int)curl_message->msg);
 225                 }
 226                 curl_message = curl_multi_info_read(curlm, &num_messages);
 227         }
 228 }
 229 #endif
 230
 231 static int http_options(const char *var, const char *value, void *cb)
 232 {
 233         if (!strcmp("http.sslverify", var)) {
 234                 curl_ssl_verify = git_config_bool(var, value);
 235                 return 0;
 236         }
 237         if (!strcmp("http.sslcipherlist", var))
 238                 return git_config_string(&ssl_cipherlist, var, value);
 239         if (!strcmp("http.sslversion", var))
 240                 return git_config_string(&ssl_version, var, value);
 241         if (!strcmp("http.sslcert", var))
 242                 return git_config_string(&ssl_cert, var, value);
 243 #if LIBCURL_VERSION_NUM >= 0x070903
 244         if (!strcmp("http.sslkey", var))
 245                 return git_config_string(&ssl_key, var, value);
 246 #endif
 247 #if LIBCURL_VERSION_NUM >= 0x070908
 248         if (!strcmp("http.sslcapath", var))
 249                 return git_config_pathname(&ssl_capath, var, value);
 250 #endif
 251         if (!strcmp("http.sslcainfo", var))
 252                 return git_config_pathname(&ssl_cainfo, var, value);
 253         if (!strcmp("http.sslcertpasswordprotected", var)) {
 254                 ssl_cert_password_required = git_config_bool(var, value);
 255                 return 0;
 256         }
 257         if (!strcmp("http.ssltry", var)) {
 258                 curl_ssl_try = git_config_bool(var, value);
 259                 return 0;
 260         }
 261         if (!strcmp("http.minsessions", var)) {
 262                 min_curl_sessions = git_config_int(var, value);
 263 #ifndef USE_CURL_MULTI
 264                 if (min_curl_sessions > 1)
 265                         min_curl_sessions = 1;
 266 #endif
 267                 return 0;
 268         }
 269 #ifdef USE_CURL_MULTI
 270         if (!strcmp("http.maxrequests", var)) {
 271                 max_requests = git_config_int(var, value);
 272                 return 0;
 273         }
 274 #endif
 275         if (!strcmp("http.lowspeedlimit", var)) {
 276                 curl_low_speed_limit = (long)git_config_int(var, value);
 277                 return 0;
 278         }
 279         if (!strcmp("http.lowspeedtime", var)) {
 280                 curl_low_speed_time = (long)git_config_int(var, value);
 281                 return 0;
 282         }
 283
 284         if (!strcmp("http.noepsv", var)) {
 285                 curl_ftp_no_epsv = git_config_bool(var, value);
 286                 return 0;
 287         }
 288         if (!strcmp("http.proxy", var))
 289                 return git_config_string(&curl_http_proxy, var, value);
 290
 291         if (!strcmp("http.proxyauthmethod", var))
 292                 return git_config_string(&http_proxy_authmethod, var, value);
 293
 294         if (!strcmp("http.cookiefile", var))
 295                 return git_config_string(&curl_cookie_file, var, value);
 296         if (!strcmp("http.savecookies", var)) {
 297                 curl_save_cookies = git_config_bool(var, value);
 298                 return 0;
 299         }
 300
 301         if (!strcmp("http.postbuffer", var)) {
 302                 http_post_buffer = git_config_int(var, value);
 303                 if (http_post_buffer < LARGE_PACKET_MAX)
 304                         http_post_buffer = LARGE_PACKET_MAX;
 305                 return 0;
 306         }
 307
 308         if (!strcmp("http.useragent", var))
 309                 return git_config_string(&user_agent, var, value);
 310
 311         if (!strcmp("http.emptyauth", var)) {
 312                 curl_empty_auth = git_config_bool(var, value);
 313                 return 0;
 314         }
 315
 316         if (!strcmp("http.pinnedpubkey", var)) {
 317 #if LIBCURL_VERSION_NUM >= 0x072c00
 318                 return git_config_pathname(&ssl_pinnedkey, var, value);
 319 #else
 320                 warning(_("Public key pinning not supported with cURL < 7.44.0"));
 321                 return 0;
 322 #endif
 323         }
 324
 325         /* Fall back on the default ones */
 326         return git_default_config(var, value, cb);
 327 }
 328
 329 static void init_curl_http_auth(CURL *result)
 330 {
 331         if (!http_auth.username) {
 332                 if (curl_empty_auth)
 333                         curl_easy_setopt(result, CURLOPT_USERPWD, ":");
 334                 return;
 335         }
 336
 337         credential_fill(&http_auth);
 338
 339 #if LIBCURL_VERSION_NUM >= 0x071301
 340         curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 341         curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 342 #else
 343         {
 344                 static struct strbuf up = STRBUF_INIT;
 345                 /*
 346                  * Note that we assume we only ever have a single set of
 347                  * credentials in a given program run, so we do not have
 348                  * to worry about updating this buffer, only setting its
 349                  * initial value.
 350                  */
 351                 if (!up.len)
 352                         strbuf_addf(&up, "%s:%s",
 353                                 http_auth.username, http_auth.password);
 354                 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 355         }
 356 #endif
 357 }
 358
 359 /* *var must be free-able */
 360 static void var_override(const char **var, char *value)
 361 {
 362         if (value) {
 363                 free((void *)*var);
 364                 *var = xstrdup(value);
 365         }
 366 }
 367
 368 static void set_proxyauth_name_password(CURL *result)
 369 {
 370 #if LIBCURL_VERSION_NUM >= 0x071301
 371                 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
 372                         proxy_auth.username);
 373                 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
 374                         proxy_auth.password);
 375 #else
 376                 struct strbuf s = STRBUF_INIT;
 377
 378                 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
 379                 strbuf_addch(&s, ':');
 380                 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
 381                 curl_proxyuserpwd = strbuf_detach(&s, NULL);
 382                 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
 383 #endif
 384 }
 385
 386 static void init_curl_proxy_auth(CURL *result)
 387 {
 388         if (proxy_auth.username) {
 389                 if (!proxy_auth.password)
 390                         credential_fill(&proxy_auth);
 391                 set_proxyauth_name_password(result);
 392         }
 393
 394         var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
 395
 396 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
 397         if (http_proxy_authmethod) {
 398                 int i;
 399                 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
 400                         if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
 401                                 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
 402                                                 proxy_authmethods[i].curlauth_param);
 403                                 break;
 404                         }
 405                 }
 406                 if (i == ARRAY_SIZE(proxy_authmethods)) {
 407                         warning("unsupported proxy authentication method %s: using anyauth",
 408                                         http_proxy_authmethod);
 409                         curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 410                 }
 411         }
 412         else
 413                 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 414 #endif
 415 }
 416
 417 static int has_cert_password(void)
 418 {
 419         if (ssl_cert == NULL || ssl_cert_password_required != 1)
 420                 return 0;
 421         if (!cert_auth.password) {
 422                 cert_auth.protocol = xstrdup("cert");
 423                 cert_auth.username = xstrdup("");
 424                 cert_auth.path = xstrdup(ssl_cert);
 425                 credential_fill(&cert_auth);
 426         }
 427         return 1;
 428 }
 429
 430 #if LIBCURL_VERSION_NUM >= 0x071900
 431 static void set_curl_keepalive(CURL *c)
 432 {
 433         curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 434 }
 435
 436 #elif LIBCURL_VERSION_NUM >= 0x071000
 437 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 438 {
 439         int ka = 1;
 440         int rc;
 441         socklen_t len = (socklen_t)sizeof(ka);
 442
 443         if (type != CURLSOCKTYPE_IPCXN)
 444                 return 0;
 445
 446         rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 447         if (rc < 0)
 448                 warning("unable to set SO_KEEPALIVE on socket %s",
 449                         strerror(errno));
 450
 451         return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 452 }
 453
 454 static void set_curl_keepalive(CURL *c)
 455 {
 456         curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 457 }
 458
 459 #else
 460 static void set_curl_keepalive(CURL *c)
 461 {
 462         /* not supported on older curl versions */
 463 }
 464 #endif
 465
 466 static CURL *get_curl_handle(void)
 467 {
 468         CURL *result = curl_easy_init();
 469         long allowed_protocols = 0;
 470
 471         if (!result)
 472                 die("curl_easy_init failed");
 473
 474         if (!curl_ssl_verify) {
 475                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 476                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 477         } else {
 478                 /* Verify authenticity of the peer's certificate */
 479                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 480                 /* The name in the cert must match whom we tried to connect */
 481                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 482         }
 483
 484 #if LIBCURL_VERSION_NUM >= 0x070907
 485         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 486 #endif
 487 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 488         curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 489 #endif
 490
 491         if (http_proactive_auth)
 492                 init_curl_http_auth(result);
 493
 494         if (getenv("GIT_SSL_VERSION"))
 495                 ssl_version = getenv("GIT_SSL_VERSION");
 496         if (ssl_version && *ssl_version) {
 497                 int i;
 498                 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
 499                         if (!strcmp(ssl_version, sslversions[i].name)) {
 500                                 curl_easy_setopt(result, CURLOPT_SSLVERSION,
 501                                                  sslversions[i].ssl_version);
 502                                 break;
 503                         }
 504                 }
 505                 if (i == ARRAY_SIZE(sslversions))
 506                         warning("unsupported ssl version %s: using default",
 507                                 ssl_version);
 508         }
 509
 510         if (getenv("GIT_SSL_CIPHER_LIST"))
 511                 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
 512         if (ssl_cipherlist != NULL && *ssl_cipherlist)
 513                 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
 514                                 ssl_cipherlist);
 515
 516         if (ssl_cert != NULL)
 517                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 518         if (has_cert_password())
 519                 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 520 #if LIBCURL_VERSION_NUM >= 0x070903
 521         if (ssl_key != NULL)
 522                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 523 #endif
 524 #if LIBCURL_VERSION_NUM >= 0x070908
 525         if (ssl_capath != NULL)
 526                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 527 #endif
 528 #if LIBCURL_VERSION_NUM >= 0x072c00
 529         if (ssl_pinnedkey != NULL)
 530                 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
 531 #endif
 532         if (ssl_cainfo != NULL)
 533                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 534
 535         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 536                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 537                                  curl_low_speed_limit);
 538                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 539                                  curl_low_speed_time);
 540         }
 541
 542         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 543         curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 544 #if LIBCURL_VERSION_NUM >= 0x071301
 545         curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 546 #elif LIBCURL_VERSION_NUM >= 0x071101
 547         curl_easy_setopt(result, CURLOPT_POST301, 1);
 548 #endif
 549 #if LIBCURL_VERSION_NUM >= 0x071304
 550         if (is_transport_allowed("http"))
 551                 allowed_protocols |= CURLPROTO_HTTP;
 552         if (is_transport_allowed("https"))
 553                 allowed_protocols |= CURLPROTO_HTTPS;
 554         if (is_transport_allowed("ftp"))
 555                 allowed_protocols |= CURLPROTO_FTP;
 556         if (is_transport_allowed("ftps"))
 557                 allowed_protocols |= CURLPROTO_FTPS;
 558         curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
 559 #else
 560         if (transport_restrict_protocols())
 561                 warning("protocol restrictions not applied to curl redirects because\n"
 562                         "your curl version is too old (>= 7.19.4)");
 563 #endif
 564
 565         if (getenv("GIT_CURL_VERBOSE"))
 566                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 567
 568         curl_easy_setopt(result, CURLOPT_USERAGENT,
 569                 user_agent ? user_agent : git_user_agent());
 570
 571         if (curl_ftp_no_epsv)
 572                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 573
 574 #ifdef CURLOPT_USE_SSL
 575         if (curl_ssl_try)
 576                 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 577 #endif
 578
 579         /*
 580          * CURL also examines these variables as a fallback; but we need to query
 581          * them here in order to decide whether to prompt for missing password (cf.
 582          * init_curl_proxy_auth()).
 583          *
 584          * Unlike many other common environment variables, these are historically
 585          * lowercase only. It appears that CURL did not know this and implemented
 586          * only uppercase variants, which was later corrected to take both - with
 587          * the exception of http_proxy, which is lowercase only also in CURL. As
 588          * the lowercase versions are the historical quasi-standard, they take
 589          * precedence here, as in CURL.
 590          */
 591         if (!curl_http_proxy) {
 592                 if (!strcmp(http_auth.protocol, "https")) {
 593                         var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
 594                         var_override(&curl_http_proxy, getenv("https_proxy"));
 595                 } else {
 596                         var_override(&curl_http_proxy, getenv("http_proxy"));
 597                 }
 598                 if (!curl_http_proxy) {
 599                         var_override(&curl_http_proxy, getenv("ALL_PROXY"));
 600                         var_override(&curl_http_proxy, getenv("all_proxy"));
 601                 }
 602         }
 603
 604         if (curl_http_proxy) {
 605                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 606 #if LIBCURL_VERSION_NUM >= 0x071800
 607                 if (starts_with(curl_http_proxy, "socks5"))
 608                         curl_easy_setopt(result,
 609                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
 610                 else if (starts_with(curl_http_proxy, "socks4a"))
 611                         curl_easy_setopt(result,
 612                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
 613                 else if (starts_with(curl_http_proxy, "socks"))
 614                         curl_easy_setopt(result,
 615                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
 616 #endif
 617                 if (strstr(curl_http_proxy, "://"))
 618                         credential_from_url(&proxy_auth, curl_http_proxy);
 619                 else {
 620                         struct strbuf url = STRBUF_INIT;
 621                         strbuf_addf(&url, "http://%s", curl_http_proxy);
 622                         credential_from_url(&proxy_auth, url.buf);
 623                         strbuf_release(&url);
 624                 }
 625
 626                 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
 627         }
 628         init_curl_proxy_auth(result);
 629
 630         set_curl_keepalive(result);
 631
 632         return result;
 633 }
 634
 635 static void set_from_env(const char **var, const char *envname)
 636 {
 637         const char *val = getenv(envname);
 638         if (val)
 639                 *var = val;
 640 }
 641
 642 void http_init(struct remote *remote, const char *url, int proactive_auth)
 643 {
 644         char *low_speed_limit;
 645         char *low_speed_time;
 646         char *normalized_url;
 647         struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 648
 649         config.section = "http";
 650         config.key = NULL;
 651         config.collect_fn = http_options;
 652         config.cascade_fn = git_default_config;
 653         config.cb = NULL;
 654
 655         http_is_verbose = 0;
 656         normalized_url = url_normalize(url, &config.url);
 657
 658         git_config(urlmatch_config_entry, &config);
 659         free(normalized_url);
 660
 661         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 662                 die("curl_global_init failed");
 663
 664         http_proactive_auth = proactive_auth;
 665
 666         if (remote && remote->http_proxy)
 667                 curl_http_proxy = xstrdup(remote->http_proxy);
 668
 669         if (remote)
 670                 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
 671
 672         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 673         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 674
 675 #ifdef USE_CURL_MULTI
 676         {
 677                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 678                 if (http_max_requests != NULL)
 679                         max_requests = atoi(http_max_requests);
 680         }
 681
 682         curlm = curl_multi_init();
 683         if (!curlm)
 684                 die("curl_multi_init failed");
 685 #endif
 686
 687         if (getenv("GIT_SSL_NO_VERIFY"))
 688                 curl_ssl_verify = 0;
 689
 690         set_from_env(&ssl_cert, "GIT_SSL_CERT");
 691 #if LIBCURL_VERSION_NUM >= 0x070903
 692         set_from_env(&ssl_key, "GIT_SSL_KEY");
 693 #endif
 694 #if LIBCURL_VERSION_NUM >= 0x070908
 695         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 696 #endif
 697         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 698
 699         set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 700
 701         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 702         if (low_speed_limit != NULL)
 703                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 704         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 705         if (low_speed_time != NULL)
 706                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 707
 708         if (curl_ssl_verify == -1)
 709                 curl_ssl_verify = 1;
 710
 711         curl_session_count = 0;
 712 #ifdef USE_CURL_MULTI
 713         if (max_requests < 1)
 714                 max_requests = DEFAULT_MAX_REQUESTS;
 715 #endif
 716
 717         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 718                 curl_ftp_no_epsv = 1;
 719
 720         if (url) {
 721                 credential_from_url(&http_auth, url);
 722                 if (!ssl_cert_password_required &&
 723                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 724                     starts_with(url, "https://"))
 725                         ssl_cert_password_required = 1;
 726         }
 727
 728 #ifndef NO_CURL_EASY_DUPHANDLE
 729         curl_default = get_curl_handle();
 730 #endif
 731 }
 732
 733 void http_cleanup(void)
 734 {
 735         struct active_request_slot *slot = active_queue_head;
 736
 737         while (slot != NULL) {
 738                 struct active_request_slot *next = slot->next;
 739                 if (slot->curl != NULL) {
 740 #ifdef USE_CURL_MULTI
 741                         curl_multi_remove_handle(curlm, slot->curl);
 742 #endif
 743                         curl_easy_cleanup(slot->curl);
 744                 }
 745                 free(slot);
 746                 slot = next;
 747         }
 748         active_queue_head = NULL;
 749
 750 #ifndef NO_CURL_EASY_DUPHANDLE
 751         curl_easy_cleanup(curl_default);
 752 #endif
 753
 754 #ifdef USE_CURL_MULTI
 755         curl_multi_cleanup(curlm);
 756 #endif
 757         curl_global_cleanup();
 758
 759         curl_slist_free_all(pragma_header);
 760         pragma_header = NULL;
 761
 762         curl_slist_free_all(no_pragma_header);
 763         no_pragma_header = NULL;
 764
 765         if (curl_http_proxy) {
 766                 free((void *)curl_http_proxy);
 767                 curl_http_proxy = NULL;
 768         }
 769
 770         if (proxy_auth.password) {
 771                 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
 772                 free(proxy_auth.password);
 773                 proxy_auth.password = NULL;
 774         }
 775
 776         free((void *)curl_proxyuserpwd);
 777         curl_proxyuserpwd = NULL;
 778
 779         free((void *)http_proxy_authmethod);
 780         http_proxy_authmethod = NULL;
 781
 782         if (cert_auth.password != NULL) {
 783                 memset(cert_auth.password, 0, strlen(cert_auth.password));
 784                 free(cert_auth.password);
 785                 cert_auth.password = NULL;
 786         }
 787         ssl_cert_password_required = 0;
 788
 789         free(cached_accept_language);
 790         cached_accept_language = NULL;
 791 }
 792
 793 struct active_request_slot *get_active_slot(void)
 794 {
 795         struct active_request_slot *slot = active_queue_head;
 796         struct active_request_slot *newslot;
 797
 798 #ifdef USE_CURL_MULTI
 799         int num_transfers;
 800
 801         /* Wait for a slot to open up if the queue is full */
 802         while (active_requests >= max_requests) {
 803                 curl_multi_perform(curlm, &num_transfers);
 804                 if (num_transfers < active_requests)
 805                         process_curl_messages();
 806         }
 807 #endif
 808
 809         while (slot != NULL && slot->in_use)
 810                 slot = slot->next;
 811
 812         if (slot == NULL) {
 813                 newslot = xmalloc(sizeof(*newslot));
 814                 newslot->curl = NULL;
 815                 newslot->in_use = 0;
 816                 newslot->next = NULL;
 817
 818                 slot = active_queue_head;
 819                 if (slot == NULL) {
 820                         active_queue_head = newslot;
 821                 } else {
 822                         while (slot->next != NULL)
 823                                 slot = slot->next;
 824                         slot->next = newslot;
 825                 }
 826                 slot = newslot;
 827         }
 828
 829         if (slot->curl == NULL) {
 830 #ifdef NO_CURL_EASY_DUPHANDLE
 831                 slot->curl = get_curl_handle();
 832 #else
 833                 slot->curl = curl_easy_duphandle(curl_default);
 834 #endif
 835                 curl_session_count++;
 836         }
 837
 838         active_requests++;
 839         slot->in_use = 1;
 840         slot->results = NULL;
 841         slot->finished = NULL;
 842         slot->callback_data = NULL;
 843         slot->callback_func = NULL;
 844         curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 845         if (curl_save_cookies)
 846                 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
 847         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 848         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 849         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 850         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 851         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 852         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 853         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 854         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 855         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
 856         curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
 857
 858 #if LIBCURL_VERSION_NUM >= 0x070a08
 859         curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
 860 #endif
 861 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 862         curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
 863 #endif
 864         if (http_auth.password || curl_empty_auth)
 865                 init_curl_http_auth(slot->curl);
 866
 867         return slot;
 868 }
 869
 870 int start_active_slot(struct active_request_slot *slot)
 871 {
 872 #ifdef USE_CURL_MULTI
 873         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 874         int num_transfers;
 875
 876         if (curlm_result != CURLM_OK &&
 877             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 878                 active_requests--;
 879                 slot->in_use = 0;
 880                 return 0;
 881         }
 882
 883         /*
 884          * We know there must be something to do, since we just added
 885          * something.
 886          */
 887         curl_multi_perform(curlm, &num_transfers);
 888 #endif
 889         return 1;
 890 }
 891
 892 #ifdef USE_CURL_MULTI
 893 struct fill_chain {
 894         void *data;
 895         int (*fill)(void *);
 896         struct fill_chain *next;
 897 };
 898
 899 static struct fill_chain *fill_cfg;
 900
 901 void add_fill_function(void *data, int (*fill)(void *))
 902 {
 903         struct fill_chain *new = xmalloc(sizeof(*new));
 904         struct fill_chain **linkp = &fill_cfg;
 905         new->data = data;
 906         new->fill = fill;
 907         new->next = NULL;
 908         while (*linkp)
 909                 linkp = &(*linkp)->next;
 910         *linkp = new;
 911 }
 912
 913 void fill_active_slots(void)
 914 {
 915         struct active_request_slot *slot = active_queue_head;
 916
 917         while (active_requests < max_requests) {
 918                 struct fill_chain *fill;
 919                 for (fill = fill_cfg; fill; fill = fill->next)
 920                         if (fill->fill(fill->data))
 921                                 break;
 922
 923                 if (!fill)
 924                         break;
 925         }
 926
 927         while (slot != NULL) {
 928                 if (!slot->in_use && slot->curl != NULL
 929                         && curl_session_count > min_curl_sessions) {
 930                         curl_easy_cleanup(slot->curl);
 931                         slot->curl = NULL;
 932                         curl_session_count--;
 933                 }
 934                 slot = slot->next;
 935         }
 936 }
 937
 938 void step_active_slots(void)
 939 {
 940         int num_transfers;
 941         CURLMcode curlm_result;
 942
 943         do {
 944                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 945         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 946         if (num_transfers < active_requests) {
 947                 process_curl_messages();
 948                 fill_active_slots();
 949         }
 950 }
 951 #endif
 952
 953 void run_active_slot(struct active_request_slot *slot)
 954 {
 955 #ifdef USE_CURL_MULTI
 956         fd_set readfds;
 957         fd_set writefds;
 958         fd_set excfds;
 959         int max_fd;
 960         struct timeval select_timeout;
 961         int finished = 0;
 962
 963         slot->finished = &finished;
 964         while (!finished) {
 965                 step_active_slots();
 966
 967                 if (slot->in_use) {
 968 #if LIBCURL_VERSION_NUM >= 0x070f04
 969                         long curl_timeout;
 970                         curl_multi_timeout(curlm, &curl_timeout);
 971                         if (curl_timeout == 0) {
 972                                 continue;
 973                         } else if (curl_timeout == -1) {
 974                                 select_timeout.tv_sec  = 0;
 975                                 select_timeout.tv_usec = 50000;
 976                         } else {
 977                                 select_timeout.tv_sec  =  curl_timeout / 1000;
 978                                 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 979                         }
 980 #else
 981                         select_timeout.tv_sec  = 0;
 982                         select_timeout.tv_usec = 50000;
 983 #endif
 984
 985                         max_fd = -1;
 986                         FD_ZERO(&readfds);
 987                         FD_ZERO(&writefds);
 988                         FD_ZERO(&excfds);
 989                         curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 990
 991                         /*
 992                          * It can happen that curl_multi_timeout returns a pathologically
 993                          * long timeout when curl_multi_fdset returns no file descriptors
 994                          * to read.  See commit message for more details.
 995                          */
 996                         if (max_fd < 0 &&
 997                             (select_timeout.tv_sec > 0 ||
 998                              select_timeout.tv_usec > 50000)) {
 999                                 select_timeout.tv_sec  = 0;
1000                                 select_timeout.tv_usec = 50000;
1001                         }
1002
1003                         select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1004                 }
1005         }
1006 #else
1007         while (slot->in_use) {
1008                 slot->curl_result = curl_easy_perform(slot->curl);
1009                 finish_active_slot(slot);
1010         }
1011 #endif
1012 }
1013
1014 static void release_active_slot(struct active_request_slot *slot)
1015 {
1016         closedown_active_slot(slot);
1017         if (slot->curl && curl_session_count > min_curl_sessions) {
1018 #ifdef USE_CURL_MULTI
1019                 curl_multi_remove_handle(curlm, slot->curl);
1020 #endif
1021                 curl_easy_cleanup(slot->curl);
1022                 slot->curl = NULL;
1023                 curl_session_count--;
1024         }
1025 #ifdef USE_CURL_MULTI
1026         fill_active_slots();
1027 #endif
1028 }
1029
1030 void finish_all_active_slots(void)
1031 {
1032         struct active_request_slot *slot = active_queue_head;
1033
1034         while (slot != NULL)
1035                 if (slot->in_use) {
1036                         run_active_slot(slot);
1037                         slot = active_queue_head;
1038                 } else {
1039                         slot = slot->next;
1040                 }
1041 }
1042
1043 /* Helpers for modifying and creating URLs */
1044 static inline int needs_quote(int ch)
1045 {
1046         if (((ch >= 'A') && (ch <= 'Z'))
1047                         || ((ch >= 'a') && (ch <= 'z'))
1048                         || ((ch >= '0') && (ch <= '9'))
1049                         || (ch == '/')
1050                         || (ch == '-')
1051                         || (ch == '.'))
1052                 return 0;
1053         return 1;
1054 }
1055
1056 static char *quote_ref_url(const char *base, const char *ref)
1057 {
1058         struct strbuf buf = STRBUF_INIT;
1059         const char *cp;
1060         int ch;
1061
1062         end_url_with_slash(&buf, base);
1063
1064         for (cp = ref; (ch = *cp) != 0; cp++)
1065                 if (needs_quote(ch))
1066                         strbuf_addf(&buf, "%%%02x", ch);
1067                 else
1068                         strbuf_addch(&buf, *cp);
1069
1070         return strbuf_detach(&buf, NULL);
1071 }
1072
1073 void append_remote_object_url(struct strbuf *buf, const char *url,
1074                               const char *hex,
1075                               int only_two_digit_prefix)
1076 {
1077         end_url_with_slash(buf, url);
1078
1079         strbuf_addf(buf, "objects/%.*s/", 2, hex);
1080         if (!only_two_digit_prefix)
1081                 strbuf_addf(buf, "%s", hex+2);
1082 }
1083
1084 char *get_remote_object_url(const char *url, const char *hex,
1085                             int only_two_digit_prefix)
1086 {
1087         struct strbuf buf = STRBUF_INIT;
1088         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1089         return strbuf_detach(&buf, NULL);
1090 }
1091
1092 static int handle_curl_result(struct slot_results *results)
1093 {
1094         /*
1095          * If we see a failing http code with CURLE_OK, we have turned off
1096          * FAILONERROR (to keep the server's custom error response), and should
1097          * translate the code into failure here.
1098          */
1099         if (results->curl_result == CURLE_OK &&
1100             results->http_code >= 400) {
1101                 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1102                 /*
1103                  * Normally curl will already have put the "reason phrase"
1104                  * from the server into curl_errorstr; unfortunately without
1105                  * FAILONERROR it is lost, so we can give only the numeric
1106                  * status code.
1107                  */
1108                 snprintf(curl_errorstr, sizeof(curl_errorstr),
1109                          "The requested URL returned error: %ld",
1110                          results->http_code);
1111         }
1112
1113         if (results->curl_result == CURLE_OK) {
1114                 credential_approve(&http_auth);
1115                 if (proxy_auth.password)
1116                         credential_approve(&proxy_auth);
1117                 return HTTP_OK;
1118         } else if (missing_target(results))
1119                 return HTTP_MISSING_TARGET;
1120         else if (results->http_code == 401) {
1121                 if (http_auth.username && http_auth.password) {
1122                         credential_reject(&http_auth);
1123                         return HTTP_NOAUTH;
1124                 } else {
1125 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1126                         http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1127 #endif
1128                         return HTTP_REAUTH;
1129                 }
1130         } else {
1131                 if (results->http_connectcode == 407)
1132                         credential_reject(&proxy_auth);
1133 #if LIBCURL_VERSION_NUM >= 0x070c00
1134                 if (!curl_errorstr[0])
1135                         strlcpy(curl_errorstr,
1136                                 curl_easy_strerror(results->curl_result),
1137                                 sizeof(curl_errorstr));
1138 #endif
1139                 return HTTP_ERROR;
1140         }
1141 }
1142
1143 int run_one_slot(struct active_request_slot *slot,
1144                  struct slot_results *results)
1145 {
1146         slot->results = results;
1147         if (!start_active_slot(slot)) {
1148                 snprintf(curl_errorstr, sizeof(curl_errorstr),
1149                          "failed to start HTTP request");
1150                 return HTTP_START_FAILED;
1151         }
1152
1153         run_active_slot(slot);
1154         return handle_curl_result(results);
1155 }
1156
1157 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1158 {
1159         char *ptr;
1160         CURLcode ret;
1161
1162         strbuf_reset(buf);
1163         ret = curl_easy_getinfo(curl, info, &ptr);
1164         if (!ret && ptr)
1165                 strbuf_addstr(buf, ptr);
1166         return ret;
1167 }
1168
1169 /*
1170  * Check for and extract a content-type parameter. "raw"
1171  * should be positioned at the start of the potential
1172  * parameter, with any whitespace already removed.
1173  *
1174  * "name" is the name of the parameter. The value is appended
1175  * to "out".
1176  */
1177 static int extract_param(const char *raw, const char *name,
1178                          struct strbuf *out)
1179 {
1180         size_t len = strlen(name);
1181
1182         if (strncasecmp(raw, name, len))
1183                 return -1;
1184         raw += len;
1185
1186         if (*raw != '=')
1187                 return -1;
1188         raw++;
1189
1190         while (*raw && !isspace(*raw) && *raw != ';')
1191                 strbuf_addch(out, *raw++);
1192         return 0;
1193 }
1194
1195 /*
1196  * Extract a normalized version of the content type, with any
1197  * spaces suppressed, all letters lowercased, and no trailing ";"
1198  * or parameters.
1199  *
1200  * Note that we will silently remove even invalid whitespace. For
1201  * example, "text / plain" is specifically forbidden by RFC 2616,
1202  * but "text/plain" is the only reasonable output, and this keeps
1203  * our code simple.
1204  *
1205  * If the "charset" argument is not NULL, store the value of any
1206  * charset parameter there.
1207  *
1208  * Example:
1209  *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1210  *   "text / plain" -> "text/plain"
1211  */
1212 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1213                                  struct strbuf *charset)
1214 {
1215         const char *p;
1216
1217         strbuf_reset(type);
1218         strbuf_grow(type, raw->len);
1219         for (p = raw->buf; *p; p++) {
1220                 if (isspace(*p))
1221                         continue;
1222                 if (*p == ';') {
1223                         p++;
1224                         break;
1225                 }
1226                 strbuf_addch(type, tolower(*p));
1227         }
1228
1229         if (!charset)
1230                 return;
1231
1232         strbuf_reset(charset);
1233         while (*p) {
1234                 while (isspace(*p) || *p == ';')
1235                         p++;
1236                 if (!extract_param(p, "charset", charset))
1237                         return;
1238                 while (*p && !isspace(*p))
1239                         p++;
1240         }
1241
1242         if (!charset->len && starts_with(type->buf, "text/"))
1243                 strbuf_addstr(charset, "ISO-8859-1");
1244 }
1245
1246 static void write_accept_language(struct strbuf *buf)
1247 {
1248         /*
1249          * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1250          * that, q-value will be smaller than 0.001, the minimum q-value the
1251          * HTTP specification allows. See
1252          * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1253          */
1254         const int MAX_DECIMAL_PLACES = 3;
1255         const int MAX_LANGUAGE_TAGS = 1000;
1256         const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1257         char **language_tags = NULL;
1258         int num_langs = 0;
1259         const char *s = get_preferred_languages();
1260         int i;
1261         struct strbuf tag = STRBUF_INIT;
1262
1263         /* Don't add Accept-Language header if no language is preferred. */
1264         if (!s)
1265                 return;
1266
1267         /*
1268          * Split the colon-separated string of preferred languages into
1269          * language_tags array.
1270          */
1271         do {
1272                 /* collect language tag */
1273                 for (; *s && (isalnum(*s) || *s == '_'); s++)
1274                         strbuf_addch(&tag, *s == '_' ? '-' : *s);
1275
1276                 /* skip .codeset, @modifier and any other unnecessary parts */
1277                 while (*s && *s != ':')
1278                         s++;
1279
1280                 if (tag.len) {
1281                         num_langs++;
1282                         REALLOC_ARRAY(language_tags, num_langs);
1283                         language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1284                         if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1285                                 break;
1286                 }
1287         } while (*s++);
1288
1289         /* write Accept-Language header into buf */
1290         if (num_langs) {
1291                 int last_buf_len = 0;
1292                 int max_q;
1293                 int decimal_places;
1294                 char q_format[32];
1295
1296                 /* add '*' */
1297                 REALLOC_ARRAY(language_tags, num_langs + 1);
1298                 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1299
1300                 /* compute decimal_places */
1301                 for (max_q = 1, decimal_places = 0;
1302                      max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1303                      decimal_places++, max_q *= 10)
1304                         ;
1305
1306                 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1307
1308                 strbuf_addstr(buf, "Accept-Language: ");
1309
1310                 for (i = 0; i < num_langs; i++) {
1311                         if (i > 0)
1312                                 strbuf_addstr(buf, ", ");
1313
1314                         strbuf_addstr(buf, language_tags[i]);
1315
1316                         if (i > 0)
1317                                 strbuf_addf(buf, q_format, max_q - i);
1318
1319                         if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1320                                 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1321                                 break;
1322                         }
1323
1324                         last_buf_len = buf->len;
1325                 }
1326         }
1327
1328         /* free language tags -- last one is a static '*' */
1329         for (i = 0; i < num_langs - 1; i++)
1330                 free(language_tags[i]);
1331         free(language_tags);
1332 }
1333
1334 /*
1335  * Get an Accept-Language header which indicates user's preferred languages.
1336  *
1337  * Examples:
1338  *   LANGUAGE= -> ""
1339  *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1340  *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1341  *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1342  *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1343  *   LANGUAGE= LANG=C -> ""
1344  */
1345 static const char *get_accept_language(void)
1346 {
1347         if (!cached_accept_language) {
1348                 struct strbuf buf = STRBUF_INIT;
1349                 write_accept_language(&buf);
1350                 if (buf.len > 0)
1351                         cached_accept_language = strbuf_detach(&buf, NULL);
1352         }
1353
1354         return cached_accept_language;
1355 }
1356
1357 static void http_opt_request_remainder(CURL *curl, off_t pos)
1358 {
1359         char buf[128];
1360         xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1361         curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1362 }
1363
1364 /* http_request() targets */
1365 #define HTTP_REQUEST_STRBUF     0
1366 #define HTTP_REQUEST_FILE       1
1367
1368 static int http_request(const char *url,
1369                         void *result, int target,
1370                         const struct http_get_options *options)
1371 {
1372         struct active_request_slot *slot;
1373         struct slot_results results;
1374         struct curl_slist *headers = NULL;
1375         struct strbuf buf = STRBUF_INIT;
1376         const char *accept_language;
1377         int ret;
1378
1379         slot = get_active_slot();
1380         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1381
1382         if (result == NULL) {
1383                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1384         } else {
1385                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1386                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1387
1388                 if (target == HTTP_REQUEST_FILE) {
1389                         off_t posn = ftello(result);
1390                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1391                                          fwrite);
1392                         if (posn > 0)
1393                                 http_opt_request_remainder(slot->curl, posn);
1394                 } else
1395                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1396                                          fwrite_buffer);
1397         }
1398
1399         accept_language = get_accept_language();
1400
1401         if (accept_language)
1402                 headers = curl_slist_append(headers, accept_language);
1403
1404         strbuf_addstr(&buf, "Pragma:");
1405         if (options && options->no_cache)
1406                 strbuf_addstr(&buf, " no-cache");
1407         if (options && options->keep_error)
1408                 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1409
1410         headers = curl_slist_append(headers, buf.buf);
1411
1412         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1413         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1414         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1415
1416         ret = run_one_slot(slot, &results);
1417
1418         if (options && options->content_type) {
1419                 struct strbuf raw = STRBUF_INIT;
1420                 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1421                 extract_content_type(&raw, options->content_type,
1422                                      options->charset);
1423                 strbuf_release(&raw);
1424         }
1425
1426         if (options && options->effective_url)
1427                 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1428                                 options->effective_url);
1429
1430         curl_slist_free_all(headers);
1431         strbuf_release(&buf);
1432
1433         return ret;
1434 }
1435
1436 /*
1437  * Update the "base" url to a more appropriate value, as deduced by
1438  * redirects seen when requesting a URL starting with "url".
1439  *
1440  * The "asked" parameter is a URL that we asked curl to access, and must begin
1441  * with "base".
1442  *
1443  * The "got" parameter is the URL that curl reported to us as where we ended
1444  * up.
1445  *
1446  * Returns 1 if we updated the base url, 0 otherwise.
1447  *
1448  * Our basic strategy is to compare "base" and "asked" to find the bits
1449  * specific to our request. We then strip those bits off of "got" to yield the
1450  * new base. So for example, if our base is "http://example.com/foo.git",
1451  * and we ask for "http://example.com/foo.git/info/refs", we might end up
1452  * with "https://other.example.com/foo.git/info/refs". We would want the
1453  * new URL to become "https://other.example.com/foo.git".
1454  *
1455  * Note that this assumes a sane redirect scheme. It's entirely possible
1456  * in the example above to end up at a URL that does not even end in
1457  * "info/refs".  In such a case we simply punt, as there is not much we can
1458  * do (and such a scheme is unlikely to represent a real git repository,
1459  * which means we are likely about to abort anyway).
1460  */
1461 static int update_url_from_redirect(struct strbuf *base,
1462                                     const char *asked,
1463                                     const struct strbuf *got)
1464 {
1465         const char *tail;
1466         size_t tail_len;
1467
1468         if (!strcmp(asked, got->buf))
1469                 return 0;
1470
1471         if (!skip_prefix(asked, base->buf, &tail))
1472                 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1473                     asked, base->buf);
1474
1475         tail_len = strlen(tail);
1476
1477         if (got->len < tail_len ||
1478             strcmp(tail, got->buf + got->len - tail_len))
1479                 return 0; /* insane redirect scheme */
1480
1481         strbuf_reset(base);
1482         strbuf_add(base, got->buf, got->len - tail_len);
1483         return 1;
1484 }
1485
1486 static int http_request_reauth(const char *url,
1487                                void *result, int target,
1488                                struct http_get_options *options)
1489 {
1490         int ret = http_request(url, result, target, options);
1491
1492         if (options && options->effective_url && options->base_url) {
1493                 if (update_url_from_redirect(options->base_url,
1494                                              url, options->effective_url)) {
1495                         credential_from_url(&http_auth, options->base_url->buf);
1496                         url = options->effective_url->buf;
1497                 }
1498         }
1499
1500         if (ret != HTTP_REAUTH)
1501                 return ret;
1502
1503         /*
1504          * If we are using KEEP_ERROR, the previous request may have
1505          * put cruft into our output stream; we should clear it out before
1506          * making our next request. We only know how to do this for
1507          * the strbuf case, but that is enough to satisfy current callers.
1508          */
1509         if (options && options->keep_error) {
1510                 switch (target) {
1511                 case HTTP_REQUEST_STRBUF:
1512                         strbuf_reset(result);
1513                         break;
1514                 default:
1515                         die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1516                 }
1517         }
1518
1519         credential_fill(&http_auth);
1520
1521         return http_request(url, result, target, options);
1522 }
1523
1524 int http_get_strbuf(const char *url,
1525                     struct strbuf *result,
1526                     struct http_get_options *options)
1527 {
1528         return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1529 }
1530
1531 /*
1532  * Downloads a URL and stores the result in the given file.
1533  *
1534  * If a previous interrupted download is detected (i.e. a previous temporary
1535  * file is still around) the download is resumed.
1536  */
1537 static int http_get_file(const char *url, const char *filename,
1538                          struct http_get_options *options)
1539 {
1540         int ret;
1541         struct strbuf tmpfile = STRBUF_INIT;
1542         FILE *result;
1543
1544         strbuf_addf(&tmpfile, "%s.temp", filename);
1545         result = fopen(tmpfile.buf, "a");
1546         if (!result) {
1547                 error("Unable to open local file %s", tmpfile.buf);
1548                 ret = HTTP_ERROR;
1549                 goto cleanup;
1550         }
1551
1552         ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1553         fclose(result);
1554
1555         if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1556                 ret = HTTP_ERROR;
1557 cleanup:
1558         strbuf_release(&tmpfile);
1559         return ret;
1560 }
1561
1562 int http_fetch_ref(const char *base, struct ref *ref)
1563 {
1564         struct http_get_options options = {0};
1565         char *url;
1566         struct strbuf buffer = STRBUF_INIT;
1567         int ret = -1;
1568
1569         options.no_cache = 1;
1570
1571         url = quote_ref_url(base, ref->name);
1572         if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1573                 strbuf_rtrim(&buffer);
1574                 if (buffer.len == 40)
1575                         ret = get_oid_hex(buffer.buf, &ref->old_oid);
1576                 else if (starts_with(buffer.buf, "ref: ")) {
1577                         ref->symref = xstrdup(buffer.buf + 5);
1578                         ret = 0;
1579                 }
1580         }
1581
1582         strbuf_release(&buffer);
1583         free(url);
1584         return ret;
1585 }
1586
1587 /* Helpers for fetching packs */
1588 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1589 {
1590         char *url, *tmp;
1591         struct strbuf buf = STRBUF_INIT;
1592
1593         if (http_is_verbose)
1594                 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1595
1596         end_url_with_slash(&buf, base_url);
1597         strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1598         url = strbuf_detach(&buf, NULL);
1599
1600         strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1601         tmp = strbuf_detach(&buf, NULL);
1602
1603         if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1604                 error("Unable to get pack index %s", url);
1605                 free(tmp);
1606                 tmp = NULL;
1607         }
1608
1609         free(url);
1610         return tmp;
1611 }
1612
1613 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1614         unsigned char *sha1, const char *base_url)
1615 {
1616         struct packed_git *new_pack;
1617         char *tmp_idx = NULL;
1618         int ret;
1619
1620         if (has_pack_index(sha1)) {
1621                 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1622                 if (!new_pack)
1623                         return -1; /* parse_pack_index() already issued error message */
1624                 goto add_pack;
1625         }
1626
1627         tmp_idx = fetch_pack_index(sha1, base_url);
1628         if (!tmp_idx)
1629                 return -1;
1630
1631         new_pack = parse_pack_index(sha1, tmp_idx);
1632         if (!new_pack) {
1633                 unlink(tmp_idx);
1634                 free(tmp_idx);
1635
1636                 return -1; /* parse_pack_index() already issued error message */
1637         }
1638
1639         ret = verify_pack_index(new_pack);
1640         if (!ret) {
1641                 close_pack_index(new_pack);
1642                 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1643         }
1644         free(tmp_idx);
1645         if (ret)
1646                 return -1;
1647
1648 add_pack:
1649         new_pack->next = *packs_head;
1650         *packs_head = new_pack;
1651         return 0;
1652 }
1653
1654 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1655 {
1656         struct http_get_options options = {0};
1657         int ret = 0, i = 0;
1658         char *url, *data;
1659         struct strbuf buf = STRBUF_INIT;
1660         unsigned char sha1[20];
1661
1662         end_url_with_slash(&buf, base_url);
1663         strbuf_addstr(&buf, "objects/info/packs");
1664         url = strbuf_detach(&buf, NULL);
1665
1666         options.no_cache = 1;
1667         ret = http_get_strbuf(url, &buf, &options);
1668         if (ret != HTTP_OK)
1669                 goto cleanup;
1670
1671         data = buf.buf;
1672         while (i < buf.len) {
1673                 switch (data[i]) {
1674                 case 'P':
1675                         i++;
1676                         if (i + 52 <= buf.len &&
1677                             starts_with(data + i, " pack-") &&
1678                             starts_with(data + i + 46, ".pack\n")) {
1679                                 get_sha1_hex(data + i + 6, sha1);
1680                                 fetch_and_setup_pack_index(packs_head, sha1,
1681                                                       base_url);
1682                                 i += 51;
1683                                 break;
1684                         }
1685                 default:
1686                         while (i < buf.len && data[i] != '\n')
1687                                 i++;
1688                 }
1689                 i++;
1690         }
1691
1692 cleanup:
1693         free(url);
1694         return ret;
1695 }
1696
1697 void release_http_pack_request(struct http_pack_request *preq)
1698 {
1699         if (preq->packfile != NULL) {
1700                 fclose(preq->packfile);
1701                 preq->packfile = NULL;
1702         }
1703         preq->slot = NULL;
1704         free(preq->url);
1705         free(preq);
1706 }
1707
1708 int finish_http_pack_request(struct http_pack_request *preq)
1709 {
1710         struct packed_git **lst;
1711         struct packed_git *p = preq->target;
1712         char *tmp_idx;
1713         size_t len;
1714         struct child_process ip = CHILD_PROCESS_INIT;
1715         const char *ip_argv[8];
1716
1717         close_pack_index(p);
1718
1719         fclose(preq->packfile);
1720         preq->packfile = NULL;
1721
1722         lst = preq->lst;
1723         while (*lst != p)
1724                 lst = &((*lst)->next);
1725         *lst = (*lst)->next;
1726
1727         if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1728                 die("BUG: pack tmpfile does not end in .pack.temp?");
1729         tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1730
1731         ip_argv[0] = "index-pack";
1732         ip_argv[1] = "-o";
1733         ip_argv[2] = tmp_idx;
1734         ip_argv[3] = preq->tmpfile;
1735         ip_argv[4] = NULL;
1736
1737         ip.argv = ip_argv;
1738         ip.git_cmd = 1;
1739         ip.no_stdin = 1;
1740         ip.no_stdout = 1;
1741
1742         if (run_command(&ip)) {
1743                 unlink(preq->tmpfile);
1744                 unlink(tmp_idx);
1745                 free(tmp_idx);
1746                 return -1;
1747         }
1748
1749         unlink(sha1_pack_index_name(p->sha1));
1750
1751         if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1752          || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1753                 free(tmp_idx);
1754                 return -1;
1755         }
1756
1757         install_packed_git(p);
1758         free(tmp_idx);
1759         return 0;
1760 }
1761
1762 struct http_pack_request *new_http_pack_request(
1763         struct packed_git *target, const char *base_url)
1764 {
1765         off_t prev_posn = 0;
1766         struct strbuf buf = STRBUF_INIT;
1767         struct http_pack_request *preq;
1768
1769         preq = xcalloc(1, sizeof(*preq));
1770         preq->target = target;
1771
1772         end_url_with_slash(&buf, base_url);
1773         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1774                 sha1_to_hex(target->sha1));
1775         preq->url = strbuf_detach(&buf, NULL);
1776
1777         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1778                 sha1_pack_name(target->sha1));
1779         preq->packfile = fopen(preq->tmpfile, "a");
1780         if (!preq->packfile) {
1781                 error("Unable to open local file %s for pack",
1782                       preq->tmpfile);
1783                 goto abort;
1784         }
1785
1786         preq->slot = get_active_slot();
1787         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1788         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1789         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1790         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1791                 no_pragma_header);
1792
1793         /*
1794          * If there is data present from a previous transfer attempt,
1795          * resume where it left off
1796          */
1797         prev_posn = ftello(preq->packfile);
1798         if (prev_posn>0) {
1799                 if (http_is_verbose)
1800                         fprintf(stderr,
1801                                 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
1802                                 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
1803                 http_opt_request_remainder(preq->slot->curl, prev_posn);
1804         }
1805
1806         return preq;
1807
1808 abort:
1809         free(preq->url);
1810         free(preq);
1811         return NULL;
1812 }
1813
1814 /* Helpers for fetching objects (loose) */
1815 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1816                                void *data)
1817 {
1818         unsigned char expn[4096];
1819         size_t size = eltsize * nmemb;
1820         int posn = 0;
1821         struct http_object_request *freq =
1822                 (struct http_object_request *)data;
1823         do {
1824                 ssize_t retval = xwrite(freq->localfile,
1825                                         (char *) ptr + posn, size - posn);
1826                 if (retval < 0)
1827                         return posn;
1828                 posn += retval;
1829         } while (posn < size);
1830
1831         freq->stream.avail_in = size;
1832         freq->stream.next_in = (void *)ptr;
1833         do {
1834                 freq->stream.next_out = expn;
1835                 freq->stream.avail_out = sizeof(expn);
1836                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1837                 git_SHA1_Update(&freq->c, expn,
1838                                 sizeof(expn) - freq->stream.avail_out);
1839         } while (freq->stream.avail_in && freq->zret == Z_OK);
1840         return size;
1841 }
1842
1843 struct http_object_request *new_http_object_request(const char *base_url,
1844         unsigned char *sha1)
1845 {
1846         char *hex = sha1_to_hex(sha1);
1847         const char *filename;
1848         char prevfile[PATH_MAX];
1849         int prevlocal;
1850         char prev_buf[PREV_BUF_SIZE];
1851         ssize_t prev_read = 0;
1852         off_t prev_posn = 0;
1853         struct http_object_request *freq;
1854
1855         freq = xcalloc(1, sizeof(*freq));
1856         hashcpy(freq->sha1, sha1);
1857         freq->localfile = -1;
1858
1859         filename = sha1_file_name(sha1);
1860         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1861                  "%s.temp", filename);
1862
1863         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1864         unlink_or_warn(prevfile);
1865         rename(freq->tmpfile, prevfile);
1866         unlink_or_warn(freq->tmpfile);
1867
1868         if (freq->localfile != -1)
1869                 error("fd leakage in start: %d", freq->localfile);
1870         freq->localfile = open(freq->tmpfile,
1871                                O_WRONLY | O_CREAT | O_EXCL, 0666);
1872         /*
1873          * This could have failed due to the "lazy directory creation";
1874          * try to mkdir the last path component.
1875          */
1876         if (freq->localfile < 0 && errno == ENOENT) {
1877                 char *dir = strrchr(freq->tmpfile, '/');
1878                 if (dir) {
1879                         *dir = 0;
1880                         mkdir(freq->tmpfile, 0777);
1881                         *dir = '/';
1882                 }
1883                 freq->localfile = open(freq->tmpfile,
1884                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
1885         }
1886
1887         if (freq->localfile < 0) {
1888                 error("Couldn't create temporary file %s: %s",
1889                       freq->tmpfile, strerror(errno));
1890                 goto abort;
1891         }
1892
1893         git_inflate_init(&freq->stream);
1894
1895         git_SHA1_Init(&freq->c);
1896
1897         freq->url = get_remote_object_url(base_url, hex, 0);
1898
1899         /*
1900          * If a previous temp file is present, process what was already
1901          * fetched.
1902          */
1903         prevlocal = open(prevfile, O_RDONLY);
1904         if (prevlocal != -1) {
1905                 do {
1906                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1907                         if (prev_read>0) {
1908                                 if (fwrite_sha1_file(prev_buf,
1909                                                      1,
1910                                                      prev_read,
1911                                                      freq) == prev_read) {
1912                                         prev_posn += prev_read;
1913                                 } else {
1914                                         prev_read = -1;
1915                                 }
1916                         }
1917                 } while (prev_read > 0);
1918                 close(prevlocal);
1919         }
1920         unlink_or_warn(prevfile);
1921
1922         /*
1923          * Reset inflate/SHA1 if there was an error reading the previous temp
1924          * file; also rewind to the beginning of the local file.
1925          */
1926         if (prev_read == -1) {
1927                 memset(&freq->stream, 0, sizeof(freq->stream));
1928                 git_inflate_init(&freq->stream);
1929                 git_SHA1_Init(&freq->c);
1930                 if (prev_posn>0) {
1931                         prev_posn = 0;
1932                         lseek(freq->localfile, 0, SEEK_SET);
1933                         if (ftruncate(freq->localfile, 0) < 0) {
1934                                 error("Couldn't truncate temporary file %s: %s",
1935                                           freq->tmpfile, strerror(errno));
1936                                 goto abort;
1937                         }
1938                 }
1939         }
1940
1941         freq->slot = get_active_slot();
1942
1943         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1944         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1945         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1946         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1947         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1948
1949         /*
1950          * If we have successfully processed data from a previous fetch
1951          * attempt, only fetch the data we don't already have.
1952          */
1953         if (prev_posn>0) {
1954                 if (http_is_verbose)
1955                         fprintf(stderr,
1956                                 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
1957                                 hex, (uintmax_t)prev_posn);
1958                 http_opt_request_remainder(freq->slot->curl, prev_posn);
1959         }
1960
1961         return freq;
1962
1963 abort:
1964         free(freq->url);
1965         free(freq);
1966         return NULL;
1967 }
1968
1969 void process_http_object_request(struct http_object_request *freq)
1970 {
1971         if (freq->slot == NULL)
1972                 return;
1973         freq->curl_result = freq->slot->curl_result;
1974         freq->http_code = freq->slot->http_code;
1975         freq->slot = NULL;
1976 }
1977
1978 int finish_http_object_request(struct http_object_request *freq)
1979 {
1980         struct stat st;
1981
1982         close(freq->localfile);
1983         freq->localfile = -1;
1984
1985         process_http_object_request(freq);
1986
1987         if (freq->http_code == 416) {
1988                 warning("requested range invalid; we may already have all the data.");
1989         } else if (freq->curl_result != CURLE_OK) {
1990                 if (stat(freq->tmpfile, &st) == 0)
1991                         if (st.st_size == 0)
1992                                 unlink_or_warn(freq->tmpfile);
1993                 return -1;
1994         }
1995
1996         git_inflate_end(&freq->stream);
1997         git_SHA1_Final(freq->real_sha1, &freq->c);
1998         if (freq->zret != Z_STREAM_END) {
1999                 unlink_or_warn(freq->tmpfile);
2000                 return -1;
2001         }
2002         if (hashcmp(freq->sha1, freq->real_sha1)) {
2003                 unlink_or_warn(freq->tmpfile);
2004                 return -1;
2005         }
2006         freq->rename =
2007                 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2008
2009         return freq->rename;
2010 }
2011
2012 void abort_http_object_request(struct http_object_request *freq)
2013 {
2014         unlink_or_warn(freq->tmpfile);
2015
2016         release_http_object_request(freq);
2017 }
2018
2019 void release_http_object_request(struct http_object_request *freq)
2020 {
2021         if (freq->localfile != -1) {
2022                 close(freq->localfile);
2023                 freq->localfile = -1;
2024         }
2025         if (freq->url != NULL) {
2026                 free(freq->url);
2027                 freq->url = NULL;
2028         }
2029         if (freq->slot != NULL) {
2030                 freq->slot->callback_func = NULL;
2031                 freq->slot->callback_data = NULL;
2032                 release_active_slot(freq->slot);
2033                 freq->slot = NULL;
2034         }
2035 }